xref: /freebsd/sys/netinet/sctp_output.c (revision 36712a94975f5bd0d26c85377283b49a2369c82f)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions are met:
10  *
11  * a) Redistributions of source code must retain the above copyright notice,
12  *    this list of conditions and the following disclaimer.
13  *
14  * b) Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in
16  *    the documentation and/or other materials provided with the distribution.
17  *
18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
19  *    contributors may be used to endorse or promote products derived
20  *    from this software without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
32  * THE POSSIBILITY OF SUCH DAMAGE.
33  */
34 
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37 
38 #include <netinet/sctp_os.h>
39 #include <sys/proc.h>
40 #include <netinet/sctp_var.h>
41 #include <netinet/sctp_sysctl.h>
42 #include <netinet/sctp_header.h>
43 #include <netinet/sctp_pcb.h>
44 #include <netinet/sctputil.h>
45 #include <netinet/sctp_output.h>
46 #include <netinet/sctp_uio.h>
47 #include <netinet/sctputil.h>
48 #include <netinet/sctp_auth.h>
49 #include <netinet/sctp_timer.h>
50 #include <netinet/sctp_asconf.h>
51 #include <netinet/sctp_indata.h>
52 #include <netinet/sctp_bsd_addr.h>
53 #include <netinet/sctp_input.h>
54 #include <netinet/sctp_crc32.h>
55 #include <netinet/sctp_kdtrace.h>
56 #if defined(INET) || defined(INET6)
57 #include <netinet/udp.h>
58 #endif
59 #include <netinet/udp_var.h>
60 #include <machine/in_cksum.h>
61 
62 
63 
64 #define SCTP_MAX_GAPS_INARRAY 4
65 struct sack_track {
66 	uint8_t right_edge;	/* mergable on the right edge */
67 	uint8_t left_edge;	/* mergable on the left edge */
68 	uint8_t num_entries;
69 	uint8_t spare;
70 	struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
71 };
72 
73 const struct sack_track sack_array[256] = {
74 	{0, 0, 0, 0,		/* 0x00 */
75 		{{0, 0},
76 		{0, 0},
77 		{0, 0},
78 		{0, 0}
79 		}
80 	},
81 	{1, 0, 1, 0,		/* 0x01 */
82 		{{0, 0},
83 		{0, 0},
84 		{0, 0},
85 		{0, 0}
86 		}
87 	},
88 	{0, 0, 1, 0,		/* 0x02 */
89 		{{1, 1},
90 		{0, 0},
91 		{0, 0},
92 		{0, 0}
93 		}
94 	},
95 	{1, 0, 1, 0,		/* 0x03 */
96 		{{0, 1},
97 		{0, 0},
98 		{0, 0},
99 		{0, 0}
100 		}
101 	},
102 	{0, 0, 1, 0,		/* 0x04 */
103 		{{2, 2},
104 		{0, 0},
105 		{0, 0},
106 		{0, 0}
107 		}
108 	},
109 	{1, 0, 2, 0,		/* 0x05 */
110 		{{0, 0},
111 		{2, 2},
112 		{0, 0},
113 		{0, 0}
114 		}
115 	},
116 	{0, 0, 1, 0,		/* 0x06 */
117 		{{1, 2},
118 		{0, 0},
119 		{0, 0},
120 		{0, 0}
121 		}
122 	},
123 	{1, 0, 1, 0,		/* 0x07 */
124 		{{0, 2},
125 		{0, 0},
126 		{0, 0},
127 		{0, 0}
128 		}
129 	},
130 	{0, 0, 1, 0,		/* 0x08 */
131 		{{3, 3},
132 		{0, 0},
133 		{0, 0},
134 		{0, 0}
135 		}
136 	},
137 	{1, 0, 2, 0,		/* 0x09 */
138 		{{0, 0},
139 		{3, 3},
140 		{0, 0},
141 		{0, 0}
142 		}
143 	},
144 	{0, 0, 2, 0,		/* 0x0a */
145 		{{1, 1},
146 		{3, 3},
147 		{0, 0},
148 		{0, 0}
149 		}
150 	},
151 	{1, 0, 2, 0,		/* 0x0b */
152 		{{0, 1},
153 		{3, 3},
154 		{0, 0},
155 		{0, 0}
156 		}
157 	},
158 	{0, 0, 1, 0,		/* 0x0c */
159 		{{2, 3},
160 		{0, 0},
161 		{0, 0},
162 		{0, 0}
163 		}
164 	},
165 	{1, 0, 2, 0,		/* 0x0d */
166 		{{0, 0},
167 		{2, 3},
168 		{0, 0},
169 		{0, 0}
170 		}
171 	},
172 	{0, 0, 1, 0,		/* 0x0e */
173 		{{1, 3},
174 		{0, 0},
175 		{0, 0},
176 		{0, 0}
177 		}
178 	},
179 	{1, 0, 1, 0,		/* 0x0f */
180 		{{0, 3},
181 		{0, 0},
182 		{0, 0},
183 		{0, 0}
184 		}
185 	},
186 	{0, 0, 1, 0,		/* 0x10 */
187 		{{4, 4},
188 		{0, 0},
189 		{0, 0},
190 		{0, 0}
191 		}
192 	},
193 	{1, 0, 2, 0,		/* 0x11 */
194 		{{0, 0},
195 		{4, 4},
196 		{0, 0},
197 		{0, 0}
198 		}
199 	},
200 	{0, 0, 2, 0,		/* 0x12 */
201 		{{1, 1},
202 		{4, 4},
203 		{0, 0},
204 		{0, 0}
205 		}
206 	},
207 	{1, 0, 2, 0,		/* 0x13 */
208 		{{0, 1},
209 		{4, 4},
210 		{0, 0},
211 		{0, 0}
212 		}
213 	},
214 	{0, 0, 2, 0,		/* 0x14 */
215 		{{2, 2},
216 		{4, 4},
217 		{0, 0},
218 		{0, 0}
219 		}
220 	},
221 	{1, 0, 3, 0,		/* 0x15 */
222 		{{0, 0},
223 		{2, 2},
224 		{4, 4},
225 		{0, 0}
226 		}
227 	},
228 	{0, 0, 2, 0,		/* 0x16 */
229 		{{1, 2},
230 		{4, 4},
231 		{0, 0},
232 		{0, 0}
233 		}
234 	},
235 	{1, 0, 2, 0,		/* 0x17 */
236 		{{0, 2},
237 		{4, 4},
238 		{0, 0},
239 		{0, 0}
240 		}
241 	},
242 	{0, 0, 1, 0,		/* 0x18 */
243 		{{3, 4},
244 		{0, 0},
245 		{0, 0},
246 		{0, 0}
247 		}
248 	},
249 	{1, 0, 2, 0,		/* 0x19 */
250 		{{0, 0},
251 		{3, 4},
252 		{0, 0},
253 		{0, 0}
254 		}
255 	},
256 	{0, 0, 2, 0,		/* 0x1a */
257 		{{1, 1},
258 		{3, 4},
259 		{0, 0},
260 		{0, 0}
261 		}
262 	},
263 	{1, 0, 2, 0,		/* 0x1b */
264 		{{0, 1},
265 		{3, 4},
266 		{0, 0},
267 		{0, 0}
268 		}
269 	},
270 	{0, 0, 1, 0,		/* 0x1c */
271 		{{2, 4},
272 		{0, 0},
273 		{0, 0},
274 		{0, 0}
275 		}
276 	},
277 	{1, 0, 2, 0,		/* 0x1d */
278 		{{0, 0},
279 		{2, 4},
280 		{0, 0},
281 		{0, 0}
282 		}
283 	},
284 	{0, 0, 1, 0,		/* 0x1e */
285 		{{1, 4},
286 		{0, 0},
287 		{0, 0},
288 		{0, 0}
289 		}
290 	},
291 	{1, 0, 1, 0,		/* 0x1f */
292 		{{0, 4},
293 		{0, 0},
294 		{0, 0},
295 		{0, 0}
296 		}
297 	},
298 	{0, 0, 1, 0,		/* 0x20 */
299 		{{5, 5},
300 		{0, 0},
301 		{0, 0},
302 		{0, 0}
303 		}
304 	},
305 	{1, 0, 2, 0,		/* 0x21 */
306 		{{0, 0},
307 		{5, 5},
308 		{0, 0},
309 		{0, 0}
310 		}
311 	},
312 	{0, 0, 2, 0,		/* 0x22 */
313 		{{1, 1},
314 		{5, 5},
315 		{0, 0},
316 		{0, 0}
317 		}
318 	},
319 	{1, 0, 2, 0,		/* 0x23 */
320 		{{0, 1},
321 		{5, 5},
322 		{0, 0},
323 		{0, 0}
324 		}
325 	},
326 	{0, 0, 2, 0,		/* 0x24 */
327 		{{2, 2},
328 		{5, 5},
329 		{0, 0},
330 		{0, 0}
331 		}
332 	},
333 	{1, 0, 3, 0,		/* 0x25 */
334 		{{0, 0},
335 		{2, 2},
336 		{5, 5},
337 		{0, 0}
338 		}
339 	},
340 	{0, 0, 2, 0,		/* 0x26 */
341 		{{1, 2},
342 		{5, 5},
343 		{0, 0},
344 		{0, 0}
345 		}
346 	},
347 	{1, 0, 2, 0,		/* 0x27 */
348 		{{0, 2},
349 		{5, 5},
350 		{0, 0},
351 		{0, 0}
352 		}
353 	},
354 	{0, 0, 2, 0,		/* 0x28 */
355 		{{3, 3},
356 		{5, 5},
357 		{0, 0},
358 		{0, 0}
359 		}
360 	},
361 	{1, 0, 3, 0,		/* 0x29 */
362 		{{0, 0},
363 		{3, 3},
364 		{5, 5},
365 		{0, 0}
366 		}
367 	},
368 	{0, 0, 3, 0,		/* 0x2a */
369 		{{1, 1},
370 		{3, 3},
371 		{5, 5},
372 		{0, 0}
373 		}
374 	},
375 	{1, 0, 3, 0,		/* 0x2b */
376 		{{0, 1},
377 		{3, 3},
378 		{5, 5},
379 		{0, 0}
380 		}
381 	},
382 	{0, 0, 2, 0,		/* 0x2c */
383 		{{2, 3},
384 		{5, 5},
385 		{0, 0},
386 		{0, 0}
387 		}
388 	},
389 	{1, 0, 3, 0,		/* 0x2d */
390 		{{0, 0},
391 		{2, 3},
392 		{5, 5},
393 		{0, 0}
394 		}
395 	},
396 	{0, 0, 2, 0,		/* 0x2e */
397 		{{1, 3},
398 		{5, 5},
399 		{0, 0},
400 		{0, 0}
401 		}
402 	},
403 	{1, 0, 2, 0,		/* 0x2f */
404 		{{0, 3},
405 		{5, 5},
406 		{0, 0},
407 		{0, 0}
408 		}
409 	},
410 	{0, 0, 1, 0,		/* 0x30 */
411 		{{4, 5},
412 		{0, 0},
413 		{0, 0},
414 		{0, 0}
415 		}
416 	},
417 	{1, 0, 2, 0,		/* 0x31 */
418 		{{0, 0},
419 		{4, 5},
420 		{0, 0},
421 		{0, 0}
422 		}
423 	},
424 	{0, 0, 2, 0,		/* 0x32 */
425 		{{1, 1},
426 		{4, 5},
427 		{0, 0},
428 		{0, 0}
429 		}
430 	},
431 	{1, 0, 2, 0,		/* 0x33 */
432 		{{0, 1},
433 		{4, 5},
434 		{0, 0},
435 		{0, 0}
436 		}
437 	},
438 	{0, 0, 2, 0,		/* 0x34 */
439 		{{2, 2},
440 		{4, 5},
441 		{0, 0},
442 		{0, 0}
443 		}
444 	},
445 	{1, 0, 3, 0,		/* 0x35 */
446 		{{0, 0},
447 		{2, 2},
448 		{4, 5},
449 		{0, 0}
450 		}
451 	},
452 	{0, 0, 2, 0,		/* 0x36 */
453 		{{1, 2},
454 		{4, 5},
455 		{0, 0},
456 		{0, 0}
457 		}
458 	},
459 	{1, 0, 2, 0,		/* 0x37 */
460 		{{0, 2},
461 		{4, 5},
462 		{0, 0},
463 		{0, 0}
464 		}
465 	},
466 	{0, 0, 1, 0,		/* 0x38 */
467 		{{3, 5},
468 		{0, 0},
469 		{0, 0},
470 		{0, 0}
471 		}
472 	},
473 	{1, 0, 2, 0,		/* 0x39 */
474 		{{0, 0},
475 		{3, 5},
476 		{0, 0},
477 		{0, 0}
478 		}
479 	},
480 	{0, 0, 2, 0,		/* 0x3a */
481 		{{1, 1},
482 		{3, 5},
483 		{0, 0},
484 		{0, 0}
485 		}
486 	},
487 	{1, 0, 2, 0,		/* 0x3b */
488 		{{0, 1},
489 		{3, 5},
490 		{0, 0},
491 		{0, 0}
492 		}
493 	},
494 	{0, 0, 1, 0,		/* 0x3c */
495 		{{2, 5},
496 		{0, 0},
497 		{0, 0},
498 		{0, 0}
499 		}
500 	},
501 	{1, 0, 2, 0,		/* 0x3d */
502 		{{0, 0},
503 		{2, 5},
504 		{0, 0},
505 		{0, 0}
506 		}
507 	},
508 	{0, 0, 1, 0,		/* 0x3e */
509 		{{1, 5},
510 		{0, 0},
511 		{0, 0},
512 		{0, 0}
513 		}
514 	},
515 	{1, 0, 1, 0,		/* 0x3f */
516 		{{0, 5},
517 		{0, 0},
518 		{0, 0},
519 		{0, 0}
520 		}
521 	},
522 	{0, 0, 1, 0,		/* 0x40 */
523 		{{6, 6},
524 		{0, 0},
525 		{0, 0},
526 		{0, 0}
527 		}
528 	},
529 	{1, 0, 2, 0,		/* 0x41 */
530 		{{0, 0},
531 		{6, 6},
532 		{0, 0},
533 		{0, 0}
534 		}
535 	},
536 	{0, 0, 2, 0,		/* 0x42 */
537 		{{1, 1},
538 		{6, 6},
539 		{0, 0},
540 		{0, 0}
541 		}
542 	},
543 	{1, 0, 2, 0,		/* 0x43 */
544 		{{0, 1},
545 		{6, 6},
546 		{0, 0},
547 		{0, 0}
548 		}
549 	},
550 	{0, 0, 2, 0,		/* 0x44 */
551 		{{2, 2},
552 		{6, 6},
553 		{0, 0},
554 		{0, 0}
555 		}
556 	},
557 	{1, 0, 3, 0,		/* 0x45 */
558 		{{0, 0},
559 		{2, 2},
560 		{6, 6},
561 		{0, 0}
562 		}
563 	},
564 	{0, 0, 2, 0,		/* 0x46 */
565 		{{1, 2},
566 		{6, 6},
567 		{0, 0},
568 		{0, 0}
569 		}
570 	},
571 	{1, 0, 2, 0,		/* 0x47 */
572 		{{0, 2},
573 		{6, 6},
574 		{0, 0},
575 		{0, 0}
576 		}
577 	},
578 	{0, 0, 2, 0,		/* 0x48 */
579 		{{3, 3},
580 		{6, 6},
581 		{0, 0},
582 		{0, 0}
583 		}
584 	},
585 	{1, 0, 3, 0,		/* 0x49 */
586 		{{0, 0},
587 		{3, 3},
588 		{6, 6},
589 		{0, 0}
590 		}
591 	},
592 	{0, 0, 3, 0,		/* 0x4a */
593 		{{1, 1},
594 		{3, 3},
595 		{6, 6},
596 		{0, 0}
597 		}
598 	},
599 	{1, 0, 3, 0,		/* 0x4b */
600 		{{0, 1},
601 		{3, 3},
602 		{6, 6},
603 		{0, 0}
604 		}
605 	},
606 	{0, 0, 2, 0,		/* 0x4c */
607 		{{2, 3},
608 		{6, 6},
609 		{0, 0},
610 		{0, 0}
611 		}
612 	},
613 	{1, 0, 3, 0,		/* 0x4d */
614 		{{0, 0},
615 		{2, 3},
616 		{6, 6},
617 		{0, 0}
618 		}
619 	},
620 	{0, 0, 2, 0,		/* 0x4e */
621 		{{1, 3},
622 		{6, 6},
623 		{0, 0},
624 		{0, 0}
625 		}
626 	},
627 	{1, 0, 2, 0,		/* 0x4f */
628 		{{0, 3},
629 		{6, 6},
630 		{0, 0},
631 		{0, 0}
632 		}
633 	},
634 	{0, 0, 2, 0,		/* 0x50 */
635 		{{4, 4},
636 		{6, 6},
637 		{0, 0},
638 		{0, 0}
639 		}
640 	},
641 	{1, 0, 3, 0,		/* 0x51 */
642 		{{0, 0},
643 		{4, 4},
644 		{6, 6},
645 		{0, 0}
646 		}
647 	},
648 	{0, 0, 3, 0,		/* 0x52 */
649 		{{1, 1},
650 		{4, 4},
651 		{6, 6},
652 		{0, 0}
653 		}
654 	},
655 	{1, 0, 3, 0,		/* 0x53 */
656 		{{0, 1},
657 		{4, 4},
658 		{6, 6},
659 		{0, 0}
660 		}
661 	},
662 	{0, 0, 3, 0,		/* 0x54 */
663 		{{2, 2},
664 		{4, 4},
665 		{6, 6},
666 		{0, 0}
667 		}
668 	},
669 	{1, 0, 4, 0,		/* 0x55 */
670 		{{0, 0},
671 		{2, 2},
672 		{4, 4},
673 		{6, 6}
674 		}
675 	},
676 	{0, 0, 3, 0,		/* 0x56 */
677 		{{1, 2},
678 		{4, 4},
679 		{6, 6},
680 		{0, 0}
681 		}
682 	},
683 	{1, 0, 3, 0,		/* 0x57 */
684 		{{0, 2},
685 		{4, 4},
686 		{6, 6},
687 		{0, 0}
688 		}
689 	},
690 	{0, 0, 2, 0,		/* 0x58 */
691 		{{3, 4},
692 		{6, 6},
693 		{0, 0},
694 		{0, 0}
695 		}
696 	},
697 	{1, 0, 3, 0,		/* 0x59 */
698 		{{0, 0},
699 		{3, 4},
700 		{6, 6},
701 		{0, 0}
702 		}
703 	},
704 	{0, 0, 3, 0,		/* 0x5a */
705 		{{1, 1},
706 		{3, 4},
707 		{6, 6},
708 		{0, 0}
709 		}
710 	},
711 	{1, 0, 3, 0,		/* 0x5b */
712 		{{0, 1},
713 		{3, 4},
714 		{6, 6},
715 		{0, 0}
716 		}
717 	},
718 	{0, 0, 2, 0,		/* 0x5c */
719 		{{2, 4},
720 		{6, 6},
721 		{0, 0},
722 		{0, 0}
723 		}
724 	},
725 	{1, 0, 3, 0,		/* 0x5d */
726 		{{0, 0},
727 		{2, 4},
728 		{6, 6},
729 		{0, 0}
730 		}
731 	},
732 	{0, 0, 2, 0,		/* 0x5e */
733 		{{1, 4},
734 		{6, 6},
735 		{0, 0},
736 		{0, 0}
737 		}
738 	},
739 	{1, 0, 2, 0,		/* 0x5f */
740 		{{0, 4},
741 		{6, 6},
742 		{0, 0},
743 		{0, 0}
744 		}
745 	},
746 	{0, 0, 1, 0,		/* 0x60 */
747 		{{5, 6},
748 		{0, 0},
749 		{0, 0},
750 		{0, 0}
751 		}
752 	},
753 	{1, 0, 2, 0,		/* 0x61 */
754 		{{0, 0},
755 		{5, 6},
756 		{0, 0},
757 		{0, 0}
758 		}
759 	},
760 	{0, 0, 2, 0,		/* 0x62 */
761 		{{1, 1},
762 		{5, 6},
763 		{0, 0},
764 		{0, 0}
765 		}
766 	},
767 	{1, 0, 2, 0,		/* 0x63 */
768 		{{0, 1},
769 		{5, 6},
770 		{0, 0},
771 		{0, 0}
772 		}
773 	},
774 	{0, 0, 2, 0,		/* 0x64 */
775 		{{2, 2},
776 		{5, 6},
777 		{0, 0},
778 		{0, 0}
779 		}
780 	},
781 	{1, 0, 3, 0,		/* 0x65 */
782 		{{0, 0},
783 		{2, 2},
784 		{5, 6},
785 		{0, 0}
786 		}
787 	},
788 	{0, 0, 2, 0,		/* 0x66 */
789 		{{1, 2},
790 		{5, 6},
791 		{0, 0},
792 		{0, 0}
793 		}
794 	},
795 	{1, 0, 2, 0,		/* 0x67 */
796 		{{0, 2},
797 		{5, 6},
798 		{0, 0},
799 		{0, 0}
800 		}
801 	},
802 	{0, 0, 2, 0,		/* 0x68 */
803 		{{3, 3},
804 		{5, 6},
805 		{0, 0},
806 		{0, 0}
807 		}
808 	},
809 	{1, 0, 3, 0,		/* 0x69 */
810 		{{0, 0},
811 		{3, 3},
812 		{5, 6},
813 		{0, 0}
814 		}
815 	},
816 	{0, 0, 3, 0,		/* 0x6a */
817 		{{1, 1},
818 		{3, 3},
819 		{5, 6},
820 		{0, 0}
821 		}
822 	},
823 	{1, 0, 3, 0,		/* 0x6b */
824 		{{0, 1},
825 		{3, 3},
826 		{5, 6},
827 		{0, 0}
828 		}
829 	},
830 	{0, 0, 2, 0,		/* 0x6c */
831 		{{2, 3},
832 		{5, 6},
833 		{0, 0},
834 		{0, 0}
835 		}
836 	},
837 	{1, 0, 3, 0,		/* 0x6d */
838 		{{0, 0},
839 		{2, 3},
840 		{5, 6},
841 		{0, 0}
842 		}
843 	},
844 	{0, 0, 2, 0,		/* 0x6e */
845 		{{1, 3},
846 		{5, 6},
847 		{0, 0},
848 		{0, 0}
849 		}
850 	},
851 	{1, 0, 2, 0,		/* 0x6f */
852 		{{0, 3},
853 		{5, 6},
854 		{0, 0},
855 		{0, 0}
856 		}
857 	},
858 	{0, 0, 1, 0,		/* 0x70 */
859 		{{4, 6},
860 		{0, 0},
861 		{0, 0},
862 		{0, 0}
863 		}
864 	},
865 	{1, 0, 2, 0,		/* 0x71 */
866 		{{0, 0},
867 		{4, 6},
868 		{0, 0},
869 		{0, 0}
870 		}
871 	},
872 	{0, 0, 2, 0,		/* 0x72 */
873 		{{1, 1},
874 		{4, 6},
875 		{0, 0},
876 		{0, 0}
877 		}
878 	},
879 	{1, 0, 2, 0,		/* 0x73 */
880 		{{0, 1},
881 		{4, 6},
882 		{0, 0},
883 		{0, 0}
884 		}
885 	},
886 	{0, 0, 2, 0,		/* 0x74 */
887 		{{2, 2},
888 		{4, 6},
889 		{0, 0},
890 		{0, 0}
891 		}
892 	},
893 	{1, 0, 3, 0,		/* 0x75 */
894 		{{0, 0},
895 		{2, 2},
896 		{4, 6},
897 		{0, 0}
898 		}
899 	},
900 	{0, 0, 2, 0,		/* 0x76 */
901 		{{1, 2},
902 		{4, 6},
903 		{0, 0},
904 		{0, 0}
905 		}
906 	},
907 	{1, 0, 2, 0,		/* 0x77 */
908 		{{0, 2},
909 		{4, 6},
910 		{0, 0},
911 		{0, 0}
912 		}
913 	},
914 	{0, 0, 1, 0,		/* 0x78 */
915 		{{3, 6},
916 		{0, 0},
917 		{0, 0},
918 		{0, 0}
919 		}
920 	},
921 	{1, 0, 2, 0,		/* 0x79 */
922 		{{0, 0},
923 		{3, 6},
924 		{0, 0},
925 		{0, 0}
926 		}
927 	},
928 	{0, 0, 2, 0,		/* 0x7a */
929 		{{1, 1},
930 		{3, 6},
931 		{0, 0},
932 		{0, 0}
933 		}
934 	},
935 	{1, 0, 2, 0,		/* 0x7b */
936 		{{0, 1},
937 		{3, 6},
938 		{0, 0},
939 		{0, 0}
940 		}
941 	},
942 	{0, 0, 1, 0,		/* 0x7c */
943 		{{2, 6},
944 		{0, 0},
945 		{0, 0},
946 		{0, 0}
947 		}
948 	},
949 	{1, 0, 2, 0,		/* 0x7d */
950 		{{0, 0},
951 		{2, 6},
952 		{0, 0},
953 		{0, 0}
954 		}
955 	},
956 	{0, 0, 1, 0,		/* 0x7e */
957 		{{1, 6},
958 		{0, 0},
959 		{0, 0},
960 		{0, 0}
961 		}
962 	},
963 	{1, 0, 1, 0,		/* 0x7f */
964 		{{0, 6},
965 		{0, 0},
966 		{0, 0},
967 		{0, 0}
968 		}
969 	},
970 	{0, 1, 1, 0,		/* 0x80 */
971 		{{7, 7},
972 		{0, 0},
973 		{0, 0},
974 		{0, 0}
975 		}
976 	},
977 	{1, 1, 2, 0,		/* 0x81 */
978 		{{0, 0},
979 		{7, 7},
980 		{0, 0},
981 		{0, 0}
982 		}
983 	},
984 	{0, 1, 2, 0,		/* 0x82 */
985 		{{1, 1},
986 		{7, 7},
987 		{0, 0},
988 		{0, 0}
989 		}
990 	},
991 	{1, 1, 2, 0,		/* 0x83 */
992 		{{0, 1},
993 		{7, 7},
994 		{0, 0},
995 		{0, 0}
996 		}
997 	},
998 	{0, 1, 2, 0,		/* 0x84 */
999 		{{2, 2},
1000 		{7, 7},
1001 		{0, 0},
1002 		{0, 0}
1003 		}
1004 	},
1005 	{1, 1, 3, 0,		/* 0x85 */
1006 		{{0, 0},
1007 		{2, 2},
1008 		{7, 7},
1009 		{0, 0}
1010 		}
1011 	},
1012 	{0, 1, 2, 0,		/* 0x86 */
1013 		{{1, 2},
1014 		{7, 7},
1015 		{0, 0},
1016 		{0, 0}
1017 		}
1018 	},
1019 	{1, 1, 2, 0,		/* 0x87 */
1020 		{{0, 2},
1021 		{7, 7},
1022 		{0, 0},
1023 		{0, 0}
1024 		}
1025 	},
1026 	{0, 1, 2, 0,		/* 0x88 */
1027 		{{3, 3},
1028 		{7, 7},
1029 		{0, 0},
1030 		{0, 0}
1031 		}
1032 	},
1033 	{1, 1, 3, 0,		/* 0x89 */
1034 		{{0, 0},
1035 		{3, 3},
1036 		{7, 7},
1037 		{0, 0}
1038 		}
1039 	},
1040 	{0, 1, 3, 0,		/* 0x8a */
1041 		{{1, 1},
1042 		{3, 3},
1043 		{7, 7},
1044 		{0, 0}
1045 		}
1046 	},
1047 	{1, 1, 3, 0,		/* 0x8b */
1048 		{{0, 1},
1049 		{3, 3},
1050 		{7, 7},
1051 		{0, 0}
1052 		}
1053 	},
1054 	{0, 1, 2, 0,		/* 0x8c */
1055 		{{2, 3},
1056 		{7, 7},
1057 		{0, 0},
1058 		{0, 0}
1059 		}
1060 	},
1061 	{1, 1, 3, 0,		/* 0x8d */
1062 		{{0, 0},
1063 		{2, 3},
1064 		{7, 7},
1065 		{0, 0}
1066 		}
1067 	},
1068 	{0, 1, 2, 0,		/* 0x8e */
1069 		{{1, 3},
1070 		{7, 7},
1071 		{0, 0},
1072 		{0, 0}
1073 		}
1074 	},
1075 	{1, 1, 2, 0,		/* 0x8f */
1076 		{{0, 3},
1077 		{7, 7},
1078 		{0, 0},
1079 		{0, 0}
1080 		}
1081 	},
1082 	{0, 1, 2, 0,		/* 0x90 */
1083 		{{4, 4},
1084 		{7, 7},
1085 		{0, 0},
1086 		{0, 0}
1087 		}
1088 	},
1089 	{1, 1, 3, 0,		/* 0x91 */
1090 		{{0, 0},
1091 		{4, 4},
1092 		{7, 7},
1093 		{0, 0}
1094 		}
1095 	},
1096 	{0, 1, 3, 0,		/* 0x92 */
1097 		{{1, 1},
1098 		{4, 4},
1099 		{7, 7},
1100 		{0, 0}
1101 		}
1102 	},
1103 	{1, 1, 3, 0,		/* 0x93 */
1104 		{{0, 1},
1105 		{4, 4},
1106 		{7, 7},
1107 		{0, 0}
1108 		}
1109 	},
1110 	{0, 1, 3, 0,		/* 0x94 */
1111 		{{2, 2},
1112 		{4, 4},
1113 		{7, 7},
1114 		{0, 0}
1115 		}
1116 	},
1117 	{1, 1, 4, 0,		/* 0x95 */
1118 		{{0, 0},
1119 		{2, 2},
1120 		{4, 4},
1121 		{7, 7}
1122 		}
1123 	},
1124 	{0, 1, 3, 0,		/* 0x96 */
1125 		{{1, 2},
1126 		{4, 4},
1127 		{7, 7},
1128 		{0, 0}
1129 		}
1130 	},
1131 	{1, 1, 3, 0,		/* 0x97 */
1132 		{{0, 2},
1133 		{4, 4},
1134 		{7, 7},
1135 		{0, 0}
1136 		}
1137 	},
1138 	{0, 1, 2, 0,		/* 0x98 */
1139 		{{3, 4},
1140 		{7, 7},
1141 		{0, 0},
1142 		{0, 0}
1143 		}
1144 	},
1145 	{1, 1, 3, 0,		/* 0x99 */
1146 		{{0, 0},
1147 		{3, 4},
1148 		{7, 7},
1149 		{0, 0}
1150 		}
1151 	},
1152 	{0, 1, 3, 0,		/* 0x9a */
1153 		{{1, 1},
1154 		{3, 4},
1155 		{7, 7},
1156 		{0, 0}
1157 		}
1158 	},
1159 	{1, 1, 3, 0,		/* 0x9b */
1160 		{{0, 1},
1161 		{3, 4},
1162 		{7, 7},
1163 		{0, 0}
1164 		}
1165 	},
1166 	{0, 1, 2, 0,		/* 0x9c */
1167 		{{2, 4},
1168 		{7, 7},
1169 		{0, 0},
1170 		{0, 0}
1171 		}
1172 	},
1173 	{1, 1, 3, 0,		/* 0x9d */
1174 		{{0, 0},
1175 		{2, 4},
1176 		{7, 7},
1177 		{0, 0}
1178 		}
1179 	},
1180 	{0, 1, 2, 0,		/* 0x9e */
1181 		{{1, 4},
1182 		{7, 7},
1183 		{0, 0},
1184 		{0, 0}
1185 		}
1186 	},
1187 	{1, 1, 2, 0,		/* 0x9f */
1188 		{{0, 4},
1189 		{7, 7},
1190 		{0, 0},
1191 		{0, 0}
1192 		}
1193 	},
1194 	{0, 1, 2, 0,		/* 0xa0 */
1195 		{{5, 5},
1196 		{7, 7},
1197 		{0, 0},
1198 		{0, 0}
1199 		}
1200 	},
1201 	{1, 1, 3, 0,		/* 0xa1 */
1202 		{{0, 0},
1203 		{5, 5},
1204 		{7, 7},
1205 		{0, 0}
1206 		}
1207 	},
1208 	{0, 1, 3, 0,		/* 0xa2 */
1209 		{{1, 1},
1210 		{5, 5},
1211 		{7, 7},
1212 		{0, 0}
1213 		}
1214 	},
1215 	{1, 1, 3, 0,		/* 0xa3 */
1216 		{{0, 1},
1217 		{5, 5},
1218 		{7, 7},
1219 		{0, 0}
1220 		}
1221 	},
1222 	{0, 1, 3, 0,		/* 0xa4 */
1223 		{{2, 2},
1224 		{5, 5},
1225 		{7, 7},
1226 		{0, 0}
1227 		}
1228 	},
1229 	{1, 1, 4, 0,		/* 0xa5 */
1230 		{{0, 0},
1231 		{2, 2},
1232 		{5, 5},
1233 		{7, 7}
1234 		}
1235 	},
1236 	{0, 1, 3, 0,		/* 0xa6 */
1237 		{{1, 2},
1238 		{5, 5},
1239 		{7, 7},
1240 		{0, 0}
1241 		}
1242 	},
1243 	{1, 1, 3, 0,		/* 0xa7 */
1244 		{{0, 2},
1245 		{5, 5},
1246 		{7, 7},
1247 		{0, 0}
1248 		}
1249 	},
1250 	{0, 1, 3, 0,		/* 0xa8 */
1251 		{{3, 3},
1252 		{5, 5},
1253 		{7, 7},
1254 		{0, 0}
1255 		}
1256 	},
1257 	{1, 1, 4, 0,		/* 0xa9 */
1258 		{{0, 0},
1259 		{3, 3},
1260 		{5, 5},
1261 		{7, 7}
1262 		}
1263 	},
1264 	{0, 1, 4, 0,		/* 0xaa */
1265 		{{1, 1},
1266 		{3, 3},
1267 		{5, 5},
1268 		{7, 7}
1269 		}
1270 	},
1271 	{1, 1, 4, 0,		/* 0xab */
1272 		{{0, 1},
1273 		{3, 3},
1274 		{5, 5},
1275 		{7, 7}
1276 		}
1277 	},
1278 	{0, 1, 3, 0,		/* 0xac */
1279 		{{2, 3},
1280 		{5, 5},
1281 		{7, 7},
1282 		{0, 0}
1283 		}
1284 	},
1285 	{1, 1, 4, 0,		/* 0xad */
1286 		{{0, 0},
1287 		{2, 3},
1288 		{5, 5},
1289 		{7, 7}
1290 		}
1291 	},
1292 	{0, 1, 3, 0,		/* 0xae */
1293 		{{1, 3},
1294 		{5, 5},
1295 		{7, 7},
1296 		{0, 0}
1297 		}
1298 	},
1299 	{1, 1, 3, 0,		/* 0xaf */
1300 		{{0, 3},
1301 		{5, 5},
1302 		{7, 7},
1303 		{0, 0}
1304 		}
1305 	},
1306 	{0, 1, 2, 0,		/* 0xb0 */
1307 		{{4, 5},
1308 		{7, 7},
1309 		{0, 0},
1310 		{0, 0}
1311 		}
1312 	},
1313 	{1, 1, 3, 0,		/* 0xb1 */
1314 		{{0, 0},
1315 		{4, 5},
1316 		{7, 7},
1317 		{0, 0}
1318 		}
1319 	},
1320 	{0, 1, 3, 0,		/* 0xb2 */
1321 		{{1, 1},
1322 		{4, 5},
1323 		{7, 7},
1324 		{0, 0}
1325 		}
1326 	},
1327 	{1, 1, 3, 0,		/* 0xb3 */
1328 		{{0, 1},
1329 		{4, 5},
1330 		{7, 7},
1331 		{0, 0}
1332 		}
1333 	},
1334 	{0, 1, 3, 0,		/* 0xb4 */
1335 		{{2, 2},
1336 		{4, 5},
1337 		{7, 7},
1338 		{0, 0}
1339 		}
1340 	},
1341 	{1, 1, 4, 0,		/* 0xb5 */
1342 		{{0, 0},
1343 		{2, 2},
1344 		{4, 5},
1345 		{7, 7}
1346 		}
1347 	},
1348 	{0, 1, 3, 0,		/* 0xb6 */
1349 		{{1, 2},
1350 		{4, 5},
1351 		{7, 7},
1352 		{0, 0}
1353 		}
1354 	},
1355 	{1, 1, 3, 0,		/* 0xb7 */
1356 		{{0, 2},
1357 		{4, 5},
1358 		{7, 7},
1359 		{0, 0}
1360 		}
1361 	},
1362 	{0, 1, 2, 0,		/* 0xb8 */
1363 		{{3, 5},
1364 		{7, 7},
1365 		{0, 0},
1366 		{0, 0}
1367 		}
1368 	},
1369 	{1, 1, 3, 0,		/* 0xb9 */
1370 		{{0, 0},
1371 		{3, 5},
1372 		{7, 7},
1373 		{0, 0}
1374 		}
1375 	},
1376 	{0, 1, 3, 0,		/* 0xba */
1377 		{{1, 1},
1378 		{3, 5},
1379 		{7, 7},
1380 		{0, 0}
1381 		}
1382 	},
1383 	{1, 1, 3, 0,		/* 0xbb */
1384 		{{0, 1},
1385 		{3, 5},
1386 		{7, 7},
1387 		{0, 0}
1388 		}
1389 	},
1390 	{0, 1, 2, 0,		/* 0xbc */
1391 		{{2, 5},
1392 		{7, 7},
1393 		{0, 0},
1394 		{0, 0}
1395 		}
1396 	},
1397 	{1, 1, 3, 0,		/* 0xbd */
1398 		{{0, 0},
1399 		{2, 5},
1400 		{7, 7},
1401 		{0, 0}
1402 		}
1403 	},
1404 	{0, 1, 2, 0,		/* 0xbe */
1405 		{{1, 5},
1406 		{7, 7},
1407 		{0, 0},
1408 		{0, 0}
1409 		}
1410 	},
1411 	{1, 1, 2, 0,		/* 0xbf */
1412 		{{0, 5},
1413 		{7, 7},
1414 		{0, 0},
1415 		{0, 0}
1416 		}
1417 	},
1418 	{0, 1, 1, 0,		/* 0xc0 */
1419 		{{6, 7},
1420 		{0, 0},
1421 		{0, 0},
1422 		{0, 0}
1423 		}
1424 	},
1425 	{1, 1, 2, 0,		/* 0xc1 */
1426 		{{0, 0},
1427 		{6, 7},
1428 		{0, 0},
1429 		{0, 0}
1430 		}
1431 	},
1432 	{0, 1, 2, 0,		/* 0xc2 */
1433 		{{1, 1},
1434 		{6, 7},
1435 		{0, 0},
1436 		{0, 0}
1437 		}
1438 	},
1439 	{1, 1, 2, 0,		/* 0xc3 */
1440 		{{0, 1},
1441 		{6, 7},
1442 		{0, 0},
1443 		{0, 0}
1444 		}
1445 	},
1446 	{0, 1, 2, 0,		/* 0xc4 */
1447 		{{2, 2},
1448 		{6, 7},
1449 		{0, 0},
1450 		{0, 0}
1451 		}
1452 	},
1453 	{1, 1, 3, 0,		/* 0xc5 */
1454 		{{0, 0},
1455 		{2, 2},
1456 		{6, 7},
1457 		{0, 0}
1458 		}
1459 	},
1460 	{0, 1, 2, 0,		/* 0xc6 */
1461 		{{1, 2},
1462 		{6, 7},
1463 		{0, 0},
1464 		{0, 0}
1465 		}
1466 	},
1467 	{1, 1, 2, 0,		/* 0xc7 */
1468 		{{0, 2},
1469 		{6, 7},
1470 		{0, 0},
1471 		{0, 0}
1472 		}
1473 	},
1474 	{0, 1, 2, 0,		/* 0xc8 */
1475 		{{3, 3},
1476 		{6, 7},
1477 		{0, 0},
1478 		{0, 0}
1479 		}
1480 	},
1481 	{1, 1, 3, 0,		/* 0xc9 */
1482 		{{0, 0},
1483 		{3, 3},
1484 		{6, 7},
1485 		{0, 0}
1486 		}
1487 	},
1488 	{0, 1, 3, 0,		/* 0xca */
1489 		{{1, 1},
1490 		{3, 3},
1491 		{6, 7},
1492 		{0, 0}
1493 		}
1494 	},
1495 	{1, 1, 3, 0,		/* 0xcb */
1496 		{{0, 1},
1497 		{3, 3},
1498 		{6, 7},
1499 		{0, 0}
1500 		}
1501 	},
1502 	{0, 1, 2, 0,		/* 0xcc */
1503 		{{2, 3},
1504 		{6, 7},
1505 		{0, 0},
1506 		{0, 0}
1507 		}
1508 	},
1509 	{1, 1, 3, 0,		/* 0xcd */
1510 		{{0, 0},
1511 		{2, 3},
1512 		{6, 7},
1513 		{0, 0}
1514 		}
1515 	},
1516 	{0, 1, 2, 0,		/* 0xce */
1517 		{{1, 3},
1518 		{6, 7},
1519 		{0, 0},
1520 		{0, 0}
1521 		}
1522 	},
1523 	{1, 1, 2, 0,		/* 0xcf */
1524 		{{0, 3},
1525 		{6, 7},
1526 		{0, 0},
1527 		{0, 0}
1528 		}
1529 	},
1530 	{0, 1, 2, 0,		/* 0xd0 */
1531 		{{4, 4},
1532 		{6, 7},
1533 		{0, 0},
1534 		{0, 0}
1535 		}
1536 	},
1537 	{1, 1, 3, 0,		/* 0xd1 */
1538 		{{0, 0},
1539 		{4, 4},
1540 		{6, 7},
1541 		{0, 0}
1542 		}
1543 	},
1544 	{0, 1, 3, 0,		/* 0xd2 */
1545 		{{1, 1},
1546 		{4, 4},
1547 		{6, 7},
1548 		{0, 0}
1549 		}
1550 	},
1551 	{1, 1, 3, 0,		/* 0xd3 */
1552 		{{0, 1},
1553 		{4, 4},
1554 		{6, 7},
1555 		{0, 0}
1556 		}
1557 	},
1558 	{0, 1, 3, 0,		/* 0xd4 */
1559 		{{2, 2},
1560 		{4, 4},
1561 		{6, 7},
1562 		{0, 0}
1563 		}
1564 	},
1565 	{1, 1, 4, 0,		/* 0xd5 */
1566 		{{0, 0},
1567 		{2, 2},
1568 		{4, 4},
1569 		{6, 7}
1570 		}
1571 	},
1572 	{0, 1, 3, 0,		/* 0xd6 */
1573 		{{1, 2},
1574 		{4, 4},
1575 		{6, 7},
1576 		{0, 0}
1577 		}
1578 	},
1579 	{1, 1, 3, 0,		/* 0xd7 */
1580 		{{0, 2},
1581 		{4, 4},
1582 		{6, 7},
1583 		{0, 0}
1584 		}
1585 	},
1586 	{0, 1, 2, 0,		/* 0xd8 */
1587 		{{3, 4},
1588 		{6, 7},
1589 		{0, 0},
1590 		{0, 0}
1591 		}
1592 	},
1593 	{1, 1, 3, 0,		/* 0xd9 */
1594 		{{0, 0},
1595 		{3, 4},
1596 		{6, 7},
1597 		{0, 0}
1598 		}
1599 	},
1600 	{0, 1, 3, 0,		/* 0xda */
1601 		{{1, 1},
1602 		{3, 4},
1603 		{6, 7},
1604 		{0, 0}
1605 		}
1606 	},
1607 	{1, 1, 3, 0,		/* 0xdb */
1608 		{{0, 1},
1609 		{3, 4},
1610 		{6, 7},
1611 		{0, 0}
1612 		}
1613 	},
1614 	{0, 1, 2, 0,		/* 0xdc */
1615 		{{2, 4},
1616 		{6, 7},
1617 		{0, 0},
1618 		{0, 0}
1619 		}
1620 	},
1621 	{1, 1, 3, 0,		/* 0xdd */
1622 		{{0, 0},
1623 		{2, 4},
1624 		{6, 7},
1625 		{0, 0}
1626 		}
1627 	},
1628 	{0, 1, 2, 0,		/* 0xde */
1629 		{{1, 4},
1630 		{6, 7},
1631 		{0, 0},
1632 		{0, 0}
1633 		}
1634 	},
1635 	{1, 1, 2, 0,		/* 0xdf */
1636 		{{0, 4},
1637 		{6, 7},
1638 		{0, 0},
1639 		{0, 0}
1640 		}
1641 	},
1642 	{0, 1, 1, 0,		/* 0xe0 */
1643 		{{5, 7},
1644 		{0, 0},
1645 		{0, 0},
1646 		{0, 0}
1647 		}
1648 	},
1649 	{1, 1, 2, 0,		/* 0xe1 */
1650 		{{0, 0},
1651 		{5, 7},
1652 		{0, 0},
1653 		{0, 0}
1654 		}
1655 	},
1656 	{0, 1, 2, 0,		/* 0xe2 */
1657 		{{1, 1},
1658 		{5, 7},
1659 		{0, 0},
1660 		{0, 0}
1661 		}
1662 	},
1663 	{1, 1, 2, 0,		/* 0xe3 */
1664 		{{0, 1},
1665 		{5, 7},
1666 		{0, 0},
1667 		{0, 0}
1668 		}
1669 	},
1670 	{0, 1, 2, 0,		/* 0xe4 */
1671 		{{2, 2},
1672 		{5, 7},
1673 		{0, 0},
1674 		{0, 0}
1675 		}
1676 	},
1677 	{1, 1, 3, 0,		/* 0xe5 */
1678 		{{0, 0},
1679 		{2, 2},
1680 		{5, 7},
1681 		{0, 0}
1682 		}
1683 	},
1684 	{0, 1, 2, 0,		/* 0xe6 */
1685 		{{1, 2},
1686 		{5, 7},
1687 		{0, 0},
1688 		{0, 0}
1689 		}
1690 	},
1691 	{1, 1, 2, 0,		/* 0xe7 */
1692 		{{0, 2},
1693 		{5, 7},
1694 		{0, 0},
1695 		{0, 0}
1696 		}
1697 	},
1698 	{0, 1, 2, 0,		/* 0xe8 */
1699 		{{3, 3},
1700 		{5, 7},
1701 		{0, 0},
1702 		{0, 0}
1703 		}
1704 	},
1705 	{1, 1, 3, 0,		/* 0xe9 */
1706 		{{0, 0},
1707 		{3, 3},
1708 		{5, 7},
1709 		{0, 0}
1710 		}
1711 	},
1712 	{0, 1, 3, 0,		/* 0xea */
1713 		{{1, 1},
1714 		{3, 3},
1715 		{5, 7},
1716 		{0, 0}
1717 		}
1718 	},
1719 	{1, 1, 3, 0,		/* 0xeb */
1720 		{{0, 1},
1721 		{3, 3},
1722 		{5, 7},
1723 		{0, 0}
1724 		}
1725 	},
1726 	{0, 1, 2, 0,		/* 0xec */
1727 		{{2, 3},
1728 		{5, 7},
1729 		{0, 0},
1730 		{0, 0}
1731 		}
1732 	},
1733 	{1, 1, 3, 0,		/* 0xed */
1734 		{{0, 0},
1735 		{2, 3},
1736 		{5, 7},
1737 		{0, 0}
1738 		}
1739 	},
1740 	{0, 1, 2, 0,		/* 0xee */
1741 		{{1, 3},
1742 		{5, 7},
1743 		{0, 0},
1744 		{0, 0}
1745 		}
1746 	},
1747 	{1, 1, 2, 0,		/* 0xef */
1748 		{{0, 3},
1749 		{5, 7},
1750 		{0, 0},
1751 		{0, 0}
1752 		}
1753 	},
1754 	{0, 1, 1, 0,		/* 0xf0 */
1755 		{{4, 7},
1756 		{0, 0},
1757 		{0, 0},
1758 		{0, 0}
1759 		}
1760 	},
1761 	{1, 1, 2, 0,		/* 0xf1 */
1762 		{{0, 0},
1763 		{4, 7},
1764 		{0, 0},
1765 		{0, 0}
1766 		}
1767 	},
1768 	{0, 1, 2, 0,		/* 0xf2 */
1769 		{{1, 1},
1770 		{4, 7},
1771 		{0, 0},
1772 		{0, 0}
1773 		}
1774 	},
1775 	{1, 1, 2, 0,		/* 0xf3 */
1776 		{{0, 1},
1777 		{4, 7},
1778 		{0, 0},
1779 		{0, 0}
1780 		}
1781 	},
1782 	{0, 1, 2, 0,		/* 0xf4 */
1783 		{{2, 2},
1784 		{4, 7},
1785 		{0, 0},
1786 		{0, 0}
1787 		}
1788 	},
1789 	{1, 1, 3, 0,		/* 0xf5 */
1790 		{{0, 0},
1791 		{2, 2},
1792 		{4, 7},
1793 		{0, 0}
1794 		}
1795 	},
1796 	{0, 1, 2, 0,		/* 0xf6 */
1797 		{{1, 2},
1798 		{4, 7},
1799 		{0, 0},
1800 		{0, 0}
1801 		}
1802 	},
1803 	{1, 1, 2, 0,		/* 0xf7 */
1804 		{{0, 2},
1805 		{4, 7},
1806 		{0, 0},
1807 		{0, 0}
1808 		}
1809 	},
1810 	{0, 1, 1, 0,		/* 0xf8 */
1811 		{{3, 7},
1812 		{0, 0},
1813 		{0, 0},
1814 		{0, 0}
1815 		}
1816 	},
1817 	{1, 1, 2, 0,		/* 0xf9 */
1818 		{{0, 0},
1819 		{3, 7},
1820 		{0, 0},
1821 		{0, 0}
1822 		}
1823 	},
1824 	{0, 1, 2, 0,		/* 0xfa */
1825 		{{1, 1},
1826 		{3, 7},
1827 		{0, 0},
1828 		{0, 0}
1829 		}
1830 	},
1831 	{1, 1, 2, 0,		/* 0xfb */
1832 		{{0, 1},
1833 		{3, 7},
1834 		{0, 0},
1835 		{0, 0}
1836 		}
1837 	},
1838 	{0, 1, 1, 0,		/* 0xfc */
1839 		{{2, 7},
1840 		{0, 0},
1841 		{0, 0},
1842 		{0, 0}
1843 		}
1844 	},
1845 	{1, 1, 2, 0,		/* 0xfd */
1846 		{{0, 0},
1847 		{2, 7},
1848 		{0, 0},
1849 		{0, 0}
1850 		}
1851 	},
1852 	{0, 1, 1, 0,		/* 0xfe */
1853 		{{1, 7},
1854 		{0, 0},
1855 		{0, 0},
1856 		{0, 0}
1857 		}
1858 	},
1859 	{1, 1, 1, 0,		/* 0xff */
1860 		{{0, 7},
1861 		{0, 0},
1862 		{0, 0},
1863 		{0, 0}
1864 		}
1865 	}
1866 };
1867 
1868 
1869 int
1870 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1871     struct sctp_scoping *scope,
1872     int do_update)
1873 {
1874 	if ((scope->loopback_scope == 0) &&
1875 	    (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1876 		/*
1877 		 * skip loopback if not in scope *
1878 		 */
1879 		return (0);
1880 	}
1881 	switch (ifa->address.sa.sa_family) {
1882 #ifdef INET
1883 	case AF_INET:
1884 		if (scope->ipv4_addr_legal) {
1885 			struct sockaddr_in *sin;
1886 
1887 			sin = &ifa->address.sin;
1888 			if (sin->sin_addr.s_addr == 0) {
1889 				/* not in scope , unspecified */
1890 				return (0);
1891 			}
1892 			if ((scope->ipv4_local_scope == 0) &&
1893 			    (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1894 				/* private address not in scope */
1895 				return (0);
1896 			}
1897 		} else {
1898 			return (0);
1899 		}
1900 		break;
1901 #endif
1902 #ifdef INET6
1903 	case AF_INET6:
1904 		if (scope->ipv6_addr_legal) {
1905 			struct sockaddr_in6 *sin6;
1906 
1907 			/*
1908 			 * Must update the flags,  bummer, which means any
1909 			 * IFA locks must now be applied HERE <->
1910 			 */
1911 			if (do_update) {
1912 				sctp_gather_internal_ifa_flags(ifa);
1913 			}
1914 			if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1915 				return (0);
1916 			}
1917 			/* ok to use deprecated addresses? */
1918 			sin6 = &ifa->address.sin6;
1919 			if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1920 				/* skip unspecifed addresses */
1921 				return (0);
1922 			}
1923 			if (	/* (local_scope == 0) && */
1924 			    (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1925 				return (0);
1926 			}
1927 			if ((scope->site_scope == 0) &&
1928 			    (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1929 				return (0);
1930 			}
1931 		} else {
1932 			return (0);
1933 		}
1934 		break;
1935 #endif
1936 	default:
1937 		return (0);
1938 	}
1939 	return (1);
1940 }
1941 
1942 static struct mbuf *
1943 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
1944 {
1945 #if defined(INET) || defined(INET6)
1946 	struct sctp_paramhdr *paramh;
1947 	struct mbuf *mret;
1948 	uint16_t plen;
1949 #endif
1950 
1951 	switch (ifa->address.sa.sa_family) {
1952 #ifdef INET
1953 	case AF_INET:
1954 		plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1955 		break;
1956 #endif
1957 #ifdef INET6
1958 	case AF_INET6:
1959 		plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1960 		break;
1961 #endif
1962 	default:
1963 		return (m);
1964 	}
1965 #if defined(INET) || defined(INET6)
1966 	if (M_TRAILINGSPACE(m) >= plen) {
1967 		/* easy side we just drop it on the end */
1968 		paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1969 		mret = m;
1970 	} else {
1971 		/* Need more space */
1972 		mret = m;
1973 		while (SCTP_BUF_NEXT(mret) != NULL) {
1974 			mret = SCTP_BUF_NEXT(mret);
1975 		}
1976 		SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1977 		if (SCTP_BUF_NEXT(mret) == NULL) {
1978 			/* We are hosed, can't add more addresses */
1979 			return (m);
1980 		}
1981 		mret = SCTP_BUF_NEXT(mret);
1982 		paramh = mtod(mret, struct sctp_paramhdr *);
1983 	}
1984 	/* now add the parameter */
1985 	switch (ifa->address.sa.sa_family) {
1986 #ifdef INET
1987 	case AF_INET:
1988 		{
1989 			struct sctp_ipv4addr_param *ipv4p;
1990 			struct sockaddr_in *sin;
1991 
1992 			sin = &ifa->address.sin;
1993 			ipv4p = (struct sctp_ipv4addr_param *)paramh;
1994 			paramh->param_type = htons(SCTP_IPV4_ADDRESS);
1995 			paramh->param_length = htons(plen);
1996 			ipv4p->addr = sin->sin_addr.s_addr;
1997 			SCTP_BUF_LEN(mret) += plen;
1998 			break;
1999 		}
2000 #endif
2001 #ifdef INET6
2002 	case AF_INET6:
2003 		{
2004 			struct sctp_ipv6addr_param *ipv6p;
2005 			struct sockaddr_in6 *sin6;
2006 
2007 			sin6 = &ifa->address.sin6;
2008 			ipv6p = (struct sctp_ipv6addr_param *)paramh;
2009 			paramh->param_type = htons(SCTP_IPV6_ADDRESS);
2010 			paramh->param_length = htons(plen);
2011 			memcpy(ipv6p->addr, &sin6->sin6_addr,
2012 			    sizeof(ipv6p->addr));
2013 			/* clear embedded scope in the address */
2014 			in6_clearscope((struct in6_addr *)ipv6p->addr);
2015 			SCTP_BUF_LEN(mret) += plen;
2016 			break;
2017 		}
2018 #endif
2019 	default:
2020 		return (m);
2021 	}
2022 	if (len != NULL) {
2023 		*len += plen;
2024 	}
2025 	return (mret);
2026 #endif
2027 }
2028 
2029 
2030 struct mbuf *
2031 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2032     struct sctp_scoping *scope,
2033     struct mbuf *m_at, int cnt_inits_to,
2034     uint16_t *padding_len, uint16_t *chunk_len)
2035 {
2036 	struct sctp_vrf *vrf = NULL;
2037 	int cnt, limit_out = 0, total_count;
2038 	uint32_t vrf_id;
2039 
2040 	vrf_id = inp->def_vrf_id;
2041 	SCTP_IPI_ADDR_RLOCK();
2042 	vrf = sctp_find_vrf(vrf_id);
2043 	if (vrf == NULL) {
2044 		SCTP_IPI_ADDR_RUNLOCK();
2045 		return (m_at);
2046 	}
2047 	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2048 		struct sctp_ifa *sctp_ifap;
2049 		struct sctp_ifn *sctp_ifnp;
2050 
2051 		cnt = cnt_inits_to;
2052 		if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2053 			limit_out = 1;
2054 			cnt = SCTP_ADDRESS_LIMIT;
2055 			goto skip_count;
2056 		}
2057 		LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2058 			if ((scope->loopback_scope == 0) &&
2059 			    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2060 				/*
2061 				 * Skip loopback devices if loopback_scope
2062 				 * not set
2063 				 */
2064 				continue;
2065 			}
2066 			LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2067 #ifdef INET
2068 				if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2069 				    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2070 				    &sctp_ifap->address.sin.sin_addr) != 0)) {
2071 					continue;
2072 				}
2073 #endif
2074 #ifdef INET6
2075 				if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2076 				    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2077 				    &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2078 					continue;
2079 				}
2080 #endif
2081 				if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2082 					continue;
2083 				}
2084 				if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2085 					continue;
2086 				}
2087 				cnt++;
2088 				if (cnt > SCTP_ADDRESS_LIMIT) {
2089 					break;
2090 				}
2091 			}
2092 			if (cnt > SCTP_ADDRESS_LIMIT) {
2093 				break;
2094 			}
2095 		}
2096 skip_count:
2097 		if (cnt > 1) {
2098 			total_count = 0;
2099 			LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2100 				cnt = 0;
2101 				if ((scope->loopback_scope == 0) &&
2102 				    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2103 					/*
2104 					 * Skip loopback devices if
2105 					 * loopback_scope not set
2106 					 */
2107 					continue;
2108 				}
2109 				LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2110 #ifdef INET
2111 					if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2112 					    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2113 					    &sctp_ifap->address.sin.sin_addr) != 0)) {
2114 						continue;
2115 					}
2116 #endif
2117 #ifdef INET6
2118 					if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2119 					    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2120 					    &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2121 						continue;
2122 					}
2123 #endif
2124 					if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2125 						continue;
2126 					}
2127 					if (sctp_is_address_in_scope(sctp_ifap,
2128 					    scope, 0) == 0) {
2129 						continue;
2130 					}
2131 					if ((chunk_len != NULL) &&
2132 					    (padding_len != NULL) &&
2133 					    (*padding_len > 0)) {
2134 						memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2135 						SCTP_BUF_LEN(m_at) += *padding_len;
2136 						*chunk_len += *padding_len;
2137 						*padding_len = 0;
2138 					}
2139 					m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2140 					if (limit_out) {
2141 						cnt++;
2142 						total_count++;
2143 						if (cnt >= 2) {
2144 							/*
2145 							 * two from each
2146 							 * address
2147 							 */
2148 							break;
2149 						}
2150 						if (total_count > SCTP_ADDRESS_LIMIT) {
2151 							/* No more addresses */
2152 							break;
2153 						}
2154 					}
2155 				}
2156 			}
2157 		}
2158 	} else {
2159 		struct sctp_laddr *laddr;
2160 
2161 		cnt = cnt_inits_to;
2162 		/* First, how many ? */
2163 		LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2164 			if (laddr->ifa == NULL) {
2165 				continue;
2166 			}
2167 			if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2168 				/*
2169 				 * Address being deleted by the system, dont
2170 				 * list.
2171 				 */
2172 				continue;
2173 			if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2174 				/*
2175 				 * Address being deleted on this ep don't
2176 				 * list.
2177 				 */
2178 				continue;
2179 			}
2180 			if (sctp_is_address_in_scope(laddr->ifa,
2181 			    scope, 1) == 0) {
2182 				continue;
2183 			}
2184 			cnt++;
2185 		}
2186 		/*
2187 		 * To get through a NAT we only list addresses if we have
2188 		 * more than one. That way if you just bind a single address
2189 		 * we let the source of the init dictate our address.
2190 		 */
2191 		if (cnt > 1) {
2192 			cnt = cnt_inits_to;
2193 			LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2194 				if (laddr->ifa == NULL) {
2195 					continue;
2196 				}
2197 				if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2198 					continue;
2199 				}
2200 				if (sctp_is_address_in_scope(laddr->ifa,
2201 				    scope, 0) == 0) {
2202 					continue;
2203 				}
2204 				if ((chunk_len != NULL) &&
2205 				    (padding_len != NULL) &&
2206 				    (*padding_len > 0)) {
2207 					memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2208 					SCTP_BUF_LEN(m_at) += *padding_len;
2209 					*chunk_len += *padding_len;
2210 					*padding_len = 0;
2211 				}
2212 				m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2213 				cnt++;
2214 				if (cnt >= SCTP_ADDRESS_LIMIT) {
2215 					break;
2216 				}
2217 			}
2218 		}
2219 	}
2220 	SCTP_IPI_ADDR_RUNLOCK();
2221 	return (m_at);
2222 }
2223 
2224 static struct sctp_ifa *
2225 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2226     uint8_t dest_is_loop,
2227     uint8_t dest_is_priv,
2228     sa_family_t fam)
2229 {
2230 	uint8_t dest_is_global = 0;
2231 
2232 	/* dest_is_priv is true if destination is a private address */
2233 	/* dest_is_loop is true if destination is a loopback addresses */
2234 
2235 	/**
2236 	 * Here we determine if its a preferred address. A preferred address
2237 	 * means it is the same scope or higher scope then the destination.
2238 	 * L = loopback, P = private, G = global
2239 	 * -----------------------------------------
2240 	 *    src    |  dest | result
2241 	 *  ----------------------------------------
2242 	 *     L     |    L  |    yes
2243 	 *  -----------------------------------------
2244 	 *     P     |    L  |    yes-v4 no-v6
2245 	 *  -----------------------------------------
2246 	 *     G     |    L  |    yes-v4 no-v6
2247 	 *  -----------------------------------------
2248 	 *     L     |    P  |    no
2249 	 *  -----------------------------------------
2250 	 *     P     |    P  |    yes
2251 	 *  -----------------------------------------
2252 	 *     G     |    P  |    no
2253 	 *   -----------------------------------------
2254 	 *     L     |    G  |    no
2255 	 *   -----------------------------------------
2256 	 *     P     |    G  |    no
2257 	 *    -----------------------------------------
2258 	 *     G     |    G  |    yes
2259 	 *    -----------------------------------------
2260 	 */
2261 
2262 	if (ifa->address.sa.sa_family != fam) {
2263 		/* forget mis-matched family */
2264 		return (NULL);
2265 	}
2266 	if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2267 		dest_is_global = 1;
2268 	}
2269 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2270 	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2271 	/* Ok the address may be ok */
2272 #ifdef INET6
2273 	if (fam == AF_INET6) {
2274 		/* ok to use deprecated addresses? no lets not! */
2275 		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2276 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2277 			return (NULL);
2278 		}
2279 		if (ifa->src_is_priv && !ifa->src_is_loop) {
2280 			if (dest_is_loop) {
2281 				SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2282 				return (NULL);
2283 			}
2284 		}
2285 		if (ifa->src_is_glob) {
2286 			if (dest_is_loop) {
2287 				SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2288 				return (NULL);
2289 			}
2290 		}
2291 	}
2292 #endif
2293 	/*
2294 	 * Now that we know what is what, implement or table this could in
2295 	 * theory be done slicker (it used to be), but this is
2296 	 * straightforward and easier to validate :-)
2297 	 */
2298 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2299 	    ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2300 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2301 	    dest_is_loop, dest_is_priv, dest_is_global);
2302 
2303 	if ((ifa->src_is_loop) && (dest_is_priv)) {
2304 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2305 		return (NULL);
2306 	}
2307 	if ((ifa->src_is_glob) && (dest_is_priv)) {
2308 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2309 		return (NULL);
2310 	}
2311 	if ((ifa->src_is_loop) && (dest_is_global)) {
2312 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2313 		return (NULL);
2314 	}
2315 	if ((ifa->src_is_priv) && (dest_is_global)) {
2316 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2317 		return (NULL);
2318 	}
2319 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2320 	/* its a preferred address */
2321 	return (ifa);
2322 }
2323 
2324 static struct sctp_ifa *
2325 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2326     uint8_t dest_is_loop,
2327     uint8_t dest_is_priv,
2328     sa_family_t fam)
2329 {
2330 	uint8_t dest_is_global = 0;
2331 
2332 	/**
2333 	 * Here we determine if its a acceptable address. A acceptable
2334 	 * address means it is the same scope or higher scope but we can
2335 	 * allow for NAT which means its ok to have a global dest and a
2336 	 * private src.
2337 	 *
2338 	 * L = loopback, P = private, G = global
2339 	 * -----------------------------------------
2340 	 *  src    |  dest | result
2341 	 * -----------------------------------------
2342 	 *   L     |   L   |    yes
2343 	 *  -----------------------------------------
2344 	 *   P     |   L   |    yes-v4 no-v6
2345 	 *  -----------------------------------------
2346 	 *   G     |   L   |    yes
2347 	 * -----------------------------------------
2348 	 *   L     |   P   |    no
2349 	 * -----------------------------------------
2350 	 *   P     |   P   |    yes
2351 	 * -----------------------------------------
2352 	 *   G     |   P   |    yes - May not work
2353 	 * -----------------------------------------
2354 	 *   L     |   G   |    no
2355 	 * -----------------------------------------
2356 	 *   P     |   G   |    yes - May not work
2357 	 * -----------------------------------------
2358 	 *   G     |   G   |    yes
2359 	 * -----------------------------------------
2360 	 */
2361 
2362 	if (ifa->address.sa.sa_family != fam) {
2363 		/* forget non matching family */
2364 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2365 		    ifa->address.sa.sa_family, fam);
2366 		return (NULL);
2367 	}
2368 	/* Ok the address may be ok */
2369 	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2370 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2371 	    dest_is_loop, dest_is_priv);
2372 	if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2373 		dest_is_global = 1;
2374 	}
2375 #ifdef INET6
2376 	if (fam == AF_INET6) {
2377 		/* ok to use deprecated addresses? */
2378 		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2379 			return (NULL);
2380 		}
2381 		if (ifa->src_is_priv) {
2382 			/* Special case, linklocal to loop */
2383 			if (dest_is_loop)
2384 				return (NULL);
2385 		}
2386 	}
2387 #endif
2388 	/*
2389 	 * Now that we know what is what, implement our table. This could in
2390 	 * theory be done slicker (it used to be), but this is
2391 	 * straightforward and easier to validate :-)
2392 	 */
2393 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2394 	    ifa->src_is_loop,
2395 	    dest_is_priv);
2396 	if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2397 		return (NULL);
2398 	}
2399 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2400 	    ifa->src_is_loop,
2401 	    dest_is_global);
2402 	if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2403 		return (NULL);
2404 	}
2405 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2406 	/* its an acceptable address */
2407 	return (ifa);
2408 }
2409 
2410 int
2411 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2412 {
2413 	struct sctp_laddr *laddr;
2414 
2415 	if (stcb == NULL) {
2416 		/* There are no restrictions, no TCB :-) */
2417 		return (0);
2418 	}
2419 	LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2420 		if (laddr->ifa == NULL) {
2421 			SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2422 			    __func__);
2423 			continue;
2424 		}
2425 		if (laddr->ifa == ifa) {
2426 			/* Yes it is on the list */
2427 			return (1);
2428 		}
2429 	}
2430 	return (0);
2431 }
2432 
2433 
2434 int
2435 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2436 {
2437 	struct sctp_laddr *laddr;
2438 
2439 	if (ifa == NULL)
2440 		return (0);
2441 	LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2442 		if (laddr->ifa == NULL) {
2443 			SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2444 			    __func__);
2445 			continue;
2446 		}
2447 		if ((laddr->ifa == ifa) && laddr->action == 0)
2448 			/* same pointer */
2449 			return (1);
2450 	}
2451 	return (0);
2452 }
2453 
2454 
2455 
2456 static struct sctp_ifa *
2457 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2458     sctp_route_t *ro,
2459     uint32_t vrf_id,
2460     int non_asoc_addr_ok,
2461     uint8_t dest_is_priv,
2462     uint8_t dest_is_loop,
2463     sa_family_t fam)
2464 {
2465 	struct sctp_laddr *laddr, *starting_point;
2466 	void *ifn;
2467 	int resettotop = 0;
2468 	struct sctp_ifn *sctp_ifn;
2469 	struct sctp_ifa *sctp_ifa, *sifa;
2470 	struct sctp_vrf *vrf;
2471 	uint32_t ifn_index;
2472 
2473 	vrf = sctp_find_vrf(vrf_id);
2474 	if (vrf == NULL)
2475 		return (NULL);
2476 
2477 	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2478 	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2479 	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2480 	/*
2481 	 * first question, is the ifn we will emit on in our list, if so, we
2482 	 * want such an address. Note that we first looked for a preferred
2483 	 * address.
2484 	 */
2485 	if (sctp_ifn) {
2486 		/* is a preferred one on the interface we route out? */
2487 		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2488 #ifdef INET
2489 			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2490 			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2491 			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2492 				continue;
2493 			}
2494 #endif
2495 #ifdef INET6
2496 			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2497 			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2498 			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2499 				continue;
2500 			}
2501 #endif
2502 			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2503 			    (non_asoc_addr_ok == 0))
2504 				continue;
2505 			sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2506 			    dest_is_loop,
2507 			    dest_is_priv, fam);
2508 			if (sifa == NULL)
2509 				continue;
2510 			if (sctp_is_addr_in_ep(inp, sifa)) {
2511 				atomic_add_int(&sifa->refcount, 1);
2512 				return (sifa);
2513 			}
2514 		}
2515 	}
2516 	/*
2517 	 * ok, now we now need to find one on the list of the addresses. We
2518 	 * can't get one on the emitting interface so let's find first a
2519 	 * preferred one. If not that an acceptable one otherwise... we
2520 	 * return NULL.
2521 	 */
2522 	starting_point = inp->next_addr_touse;
2523 once_again:
2524 	if (inp->next_addr_touse == NULL) {
2525 		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2526 		resettotop = 1;
2527 	}
2528 	for (laddr = inp->next_addr_touse; laddr;
2529 	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2530 		if (laddr->ifa == NULL) {
2531 			/* address has been removed */
2532 			continue;
2533 		}
2534 		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2535 			/* address is being deleted */
2536 			continue;
2537 		}
2538 		sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2539 		    dest_is_priv, fam);
2540 		if (sifa == NULL)
2541 			continue;
2542 		atomic_add_int(&sifa->refcount, 1);
2543 		return (sifa);
2544 	}
2545 	if (resettotop == 0) {
2546 		inp->next_addr_touse = NULL;
2547 		goto once_again;
2548 	}
2549 
2550 	inp->next_addr_touse = starting_point;
2551 	resettotop = 0;
2552 once_again_too:
2553 	if (inp->next_addr_touse == NULL) {
2554 		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2555 		resettotop = 1;
2556 	}
2557 
2558 	/* ok, what about an acceptable address in the inp */
2559 	for (laddr = inp->next_addr_touse; laddr;
2560 	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2561 		if (laddr->ifa == NULL) {
2562 			/* address has been removed */
2563 			continue;
2564 		}
2565 		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2566 			/* address is being deleted */
2567 			continue;
2568 		}
2569 		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2570 		    dest_is_priv, fam);
2571 		if (sifa == NULL)
2572 			continue;
2573 		atomic_add_int(&sifa->refcount, 1);
2574 		return (sifa);
2575 	}
2576 	if (resettotop == 0) {
2577 		inp->next_addr_touse = NULL;
2578 		goto once_again_too;
2579 	}
2580 
2581 	/*
2582 	 * no address bound can be a source for the destination we are in
2583 	 * trouble
2584 	 */
2585 	return (NULL);
2586 }
2587 
2588 
2589 
2590 static struct sctp_ifa *
2591 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2592     struct sctp_tcb *stcb,
2593     sctp_route_t *ro,
2594     uint32_t vrf_id,
2595     uint8_t dest_is_priv,
2596     uint8_t dest_is_loop,
2597     int non_asoc_addr_ok,
2598     sa_family_t fam)
2599 {
2600 	struct sctp_laddr *laddr, *starting_point;
2601 	void *ifn;
2602 	struct sctp_ifn *sctp_ifn;
2603 	struct sctp_ifa *sctp_ifa, *sifa;
2604 	uint8_t start_at_beginning = 0;
2605 	struct sctp_vrf *vrf;
2606 	uint32_t ifn_index;
2607 
2608 	/*
2609 	 * first question, is the ifn we will emit on in our list, if so, we
2610 	 * want that one.
2611 	 */
2612 	vrf = sctp_find_vrf(vrf_id);
2613 	if (vrf == NULL)
2614 		return (NULL);
2615 
2616 	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2617 	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2618 	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2619 
2620 	/*
2621 	 * first question, is the ifn we will emit on in our list?  If so,
2622 	 * we want that one. First we look for a preferred. Second, we go
2623 	 * for an acceptable.
2624 	 */
2625 	if (sctp_ifn) {
2626 		/* first try for a preferred address on the ep */
2627 		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2628 #ifdef INET
2629 			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2630 			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2631 			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2632 				continue;
2633 			}
2634 #endif
2635 #ifdef INET6
2636 			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2637 			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2638 			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2639 				continue;
2640 			}
2641 #endif
2642 			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2643 				continue;
2644 			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2645 				sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2646 				if (sifa == NULL)
2647 					continue;
2648 				if (((non_asoc_addr_ok == 0) &&
2649 				    (sctp_is_addr_restricted(stcb, sifa))) ||
2650 				    (non_asoc_addr_ok &&
2651 				    (sctp_is_addr_restricted(stcb, sifa)) &&
2652 				    (!sctp_is_addr_pending(stcb, sifa)))) {
2653 					/* on the no-no list */
2654 					continue;
2655 				}
2656 				atomic_add_int(&sifa->refcount, 1);
2657 				return (sifa);
2658 			}
2659 		}
2660 		/* next try for an acceptable address on the ep */
2661 		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2662 #ifdef INET
2663 			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2664 			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2665 			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2666 				continue;
2667 			}
2668 #endif
2669 #ifdef INET6
2670 			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2671 			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2672 			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2673 				continue;
2674 			}
2675 #endif
2676 			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2677 				continue;
2678 			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2679 				sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2680 				if (sifa == NULL)
2681 					continue;
2682 				if (((non_asoc_addr_ok == 0) &&
2683 				    (sctp_is_addr_restricted(stcb, sifa))) ||
2684 				    (non_asoc_addr_ok &&
2685 				    (sctp_is_addr_restricted(stcb, sifa)) &&
2686 				    (!sctp_is_addr_pending(stcb, sifa)))) {
2687 					/* on the no-no list */
2688 					continue;
2689 				}
2690 				atomic_add_int(&sifa->refcount, 1);
2691 				return (sifa);
2692 			}
2693 		}
2694 
2695 	}
2696 	/*
2697 	 * if we can't find one like that then we must look at all addresses
2698 	 * bound to pick one at first preferable then secondly acceptable.
2699 	 */
2700 	starting_point = stcb->asoc.last_used_address;
2701 sctp_from_the_top:
2702 	if (stcb->asoc.last_used_address == NULL) {
2703 		start_at_beginning = 1;
2704 		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2705 	}
2706 	/* search beginning with the last used address */
2707 	for (laddr = stcb->asoc.last_used_address; laddr;
2708 	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2709 		if (laddr->ifa == NULL) {
2710 			/* address has been removed */
2711 			continue;
2712 		}
2713 		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2714 			/* address is being deleted */
2715 			continue;
2716 		}
2717 		sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2718 		if (sifa == NULL)
2719 			continue;
2720 		if (((non_asoc_addr_ok == 0) &&
2721 		    (sctp_is_addr_restricted(stcb, sifa))) ||
2722 		    (non_asoc_addr_ok &&
2723 		    (sctp_is_addr_restricted(stcb, sifa)) &&
2724 		    (!sctp_is_addr_pending(stcb, sifa)))) {
2725 			/* on the no-no list */
2726 			continue;
2727 		}
2728 		stcb->asoc.last_used_address = laddr;
2729 		atomic_add_int(&sifa->refcount, 1);
2730 		return (sifa);
2731 	}
2732 	if (start_at_beginning == 0) {
2733 		stcb->asoc.last_used_address = NULL;
2734 		goto sctp_from_the_top;
2735 	}
2736 	/* now try for any higher scope than the destination */
2737 	stcb->asoc.last_used_address = starting_point;
2738 	start_at_beginning = 0;
2739 sctp_from_the_top2:
2740 	if (stcb->asoc.last_used_address == NULL) {
2741 		start_at_beginning = 1;
2742 		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2743 	}
2744 	/* search beginning with the last used address */
2745 	for (laddr = stcb->asoc.last_used_address; laddr;
2746 	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2747 		if (laddr->ifa == NULL) {
2748 			/* address has been removed */
2749 			continue;
2750 		}
2751 		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2752 			/* address is being deleted */
2753 			continue;
2754 		}
2755 		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2756 		    dest_is_priv, fam);
2757 		if (sifa == NULL)
2758 			continue;
2759 		if (((non_asoc_addr_ok == 0) &&
2760 		    (sctp_is_addr_restricted(stcb, sifa))) ||
2761 		    (non_asoc_addr_ok &&
2762 		    (sctp_is_addr_restricted(stcb, sifa)) &&
2763 		    (!sctp_is_addr_pending(stcb, sifa)))) {
2764 			/* on the no-no list */
2765 			continue;
2766 		}
2767 		stcb->asoc.last_used_address = laddr;
2768 		atomic_add_int(&sifa->refcount, 1);
2769 		return (sifa);
2770 	}
2771 	if (start_at_beginning == 0) {
2772 		stcb->asoc.last_used_address = NULL;
2773 		goto sctp_from_the_top2;
2774 	}
2775 	return (NULL);
2776 }
2777 
2778 static struct sctp_ifa *
2779 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2780     struct sctp_inpcb *inp,
2781     struct sctp_tcb *stcb,
2782     int non_asoc_addr_ok,
2783     uint8_t dest_is_loop,
2784     uint8_t dest_is_priv,
2785     int addr_wanted,
2786     sa_family_t fam,
2787     sctp_route_t *ro
2788 )
2789 {
2790 	struct sctp_ifa *ifa, *sifa;
2791 	int num_eligible_addr = 0;
2792 #ifdef INET6
2793 	struct sockaddr_in6 sin6, lsa6;
2794 
2795 	if (fam == AF_INET6) {
2796 		memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2797 		(void)sa6_recoverscope(&sin6);
2798 	}
2799 #endif				/* INET6 */
2800 	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2801 #ifdef INET
2802 		if ((ifa->address.sa.sa_family == AF_INET) &&
2803 		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2804 		    &ifa->address.sin.sin_addr) != 0)) {
2805 			continue;
2806 		}
2807 #endif
2808 #ifdef INET6
2809 		if ((ifa->address.sa.sa_family == AF_INET6) &&
2810 		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2811 		    &ifa->address.sin6.sin6_addr) != 0)) {
2812 			continue;
2813 		}
2814 #endif
2815 		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2816 		    (non_asoc_addr_ok == 0))
2817 			continue;
2818 		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2819 		    dest_is_priv, fam);
2820 		if (sifa == NULL)
2821 			continue;
2822 #ifdef INET6
2823 		if (fam == AF_INET6 &&
2824 		    dest_is_loop &&
2825 		    sifa->src_is_loop && sifa->src_is_priv) {
2826 			/*
2827 			 * don't allow fe80::1 to be a src on loop ::1, we
2828 			 * don't list it to the peer so we will get an
2829 			 * abort.
2830 			 */
2831 			continue;
2832 		}
2833 		if (fam == AF_INET6 &&
2834 		    IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2835 		    IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2836 			/*
2837 			 * link-local <-> link-local must belong to the same
2838 			 * scope.
2839 			 */
2840 			memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2841 			(void)sa6_recoverscope(&lsa6);
2842 			if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2843 				continue;
2844 			}
2845 		}
2846 #endif				/* INET6 */
2847 
2848 		/*
2849 		 * Check if the IPv6 address matches to next-hop. In the
2850 		 * mobile case, old IPv6 address may be not deleted from the
2851 		 * interface. Then, the interface has previous and new
2852 		 * addresses.  We should use one corresponding to the
2853 		 * next-hop.  (by micchie)
2854 		 */
2855 #ifdef INET6
2856 		if (stcb && fam == AF_INET6 &&
2857 		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2858 			if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2859 			    == 0) {
2860 				continue;
2861 			}
2862 		}
2863 #endif
2864 #ifdef INET
2865 		/* Avoid topologically incorrect IPv4 address */
2866 		if (stcb && fam == AF_INET &&
2867 		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2868 			if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2869 				continue;
2870 			}
2871 		}
2872 #endif
2873 		if (stcb) {
2874 			if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2875 				continue;
2876 			}
2877 			if (((non_asoc_addr_ok == 0) &&
2878 			    (sctp_is_addr_restricted(stcb, sifa))) ||
2879 			    (non_asoc_addr_ok &&
2880 			    (sctp_is_addr_restricted(stcb, sifa)) &&
2881 			    (!sctp_is_addr_pending(stcb, sifa)))) {
2882 				/*
2883 				 * It is restricted for some reason..
2884 				 * probably not yet added.
2885 				 */
2886 				continue;
2887 			}
2888 		}
2889 		if (num_eligible_addr >= addr_wanted) {
2890 			return (sifa);
2891 		}
2892 		num_eligible_addr++;
2893 	}
2894 	return (NULL);
2895 }
2896 
2897 
2898 static int
2899 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2900     struct sctp_inpcb *inp,
2901     struct sctp_tcb *stcb,
2902     int non_asoc_addr_ok,
2903     uint8_t dest_is_loop,
2904     uint8_t dest_is_priv,
2905     sa_family_t fam)
2906 {
2907 	struct sctp_ifa *ifa, *sifa;
2908 	int num_eligible_addr = 0;
2909 
2910 	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2911 #ifdef INET
2912 		if ((ifa->address.sa.sa_family == AF_INET) &&
2913 		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2914 		    &ifa->address.sin.sin_addr) != 0)) {
2915 			continue;
2916 		}
2917 #endif
2918 #ifdef INET6
2919 		if ((ifa->address.sa.sa_family == AF_INET6) &&
2920 		    (stcb != NULL) &&
2921 		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2922 		    &ifa->address.sin6.sin6_addr) != 0)) {
2923 			continue;
2924 		}
2925 #endif
2926 		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2927 		    (non_asoc_addr_ok == 0)) {
2928 			continue;
2929 		}
2930 		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2931 		    dest_is_priv, fam);
2932 		if (sifa == NULL) {
2933 			continue;
2934 		}
2935 		if (stcb) {
2936 			if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2937 				continue;
2938 			}
2939 			if (((non_asoc_addr_ok == 0) &&
2940 			    (sctp_is_addr_restricted(stcb, sifa))) ||
2941 			    (non_asoc_addr_ok &&
2942 			    (sctp_is_addr_restricted(stcb, sifa)) &&
2943 			    (!sctp_is_addr_pending(stcb, sifa)))) {
2944 				/*
2945 				 * It is restricted for some reason..
2946 				 * probably not yet added.
2947 				 */
2948 				continue;
2949 			}
2950 		}
2951 		num_eligible_addr++;
2952 	}
2953 	return (num_eligible_addr);
2954 }
2955 
2956 static struct sctp_ifa *
2957 sctp_choose_boundall(struct sctp_inpcb *inp,
2958     struct sctp_tcb *stcb,
2959     struct sctp_nets *net,
2960     sctp_route_t *ro,
2961     uint32_t vrf_id,
2962     uint8_t dest_is_priv,
2963     uint8_t dest_is_loop,
2964     int non_asoc_addr_ok,
2965     sa_family_t fam)
2966 {
2967 	int cur_addr_num = 0, num_preferred = 0;
2968 	void *ifn;
2969 	struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2970 	struct sctp_ifa *sctp_ifa, *sifa;
2971 	uint32_t ifn_index;
2972 	struct sctp_vrf *vrf;
2973 #ifdef INET
2974 	int retried = 0;
2975 #endif
2976 
2977 	/*-
2978 	 * For boundall we can use any address in the association.
2979 	 * If non_asoc_addr_ok is set we can use any address (at least in
2980 	 * theory). So we look for preferred addresses first. If we find one,
2981 	 * we use it. Otherwise we next try to get an address on the
2982 	 * interface, which we should be able to do (unless non_asoc_addr_ok
2983 	 * is false and we are routed out that way). In these cases where we
2984 	 * can't use the address of the interface we go through all the
2985 	 * ifn's looking for an address we can use and fill that in. Punting
2986 	 * means we send back address 0, which will probably cause problems
2987 	 * actually since then IP will fill in the address of the route ifn,
2988 	 * which means we probably already rejected it.. i.e. here comes an
2989 	 * abort :-<.
2990 	 */
2991 	vrf = sctp_find_vrf(vrf_id);
2992 	if (vrf == NULL)
2993 		return (NULL);
2994 
2995 	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2996 	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2997 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2998 	emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2999 	if (sctp_ifn == NULL) {
3000 		/* ?? We don't have this guy ?? */
3001 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
3002 		goto bound_all_plan_b;
3003 	}
3004 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3005 	    ifn_index, sctp_ifn->ifn_name);
3006 
3007 	if (net) {
3008 		cur_addr_num = net->indx_of_eligible_next_to_use;
3009 	}
3010 	num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3011 	    inp, stcb,
3012 	    non_asoc_addr_ok,
3013 	    dest_is_loop,
3014 	    dest_is_priv, fam);
3015 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3016 	    num_preferred, sctp_ifn->ifn_name);
3017 	if (num_preferred == 0) {
3018 		/*
3019 		 * no eligible addresses, we must use some other interface
3020 		 * address if we can find one.
3021 		 */
3022 		goto bound_all_plan_b;
3023 	}
3024 	/*
3025 	 * Ok we have num_eligible_addr set with how many we can use, this
3026 	 * may vary from call to call due to addresses being deprecated
3027 	 * etc..
3028 	 */
3029 	if (cur_addr_num >= num_preferred) {
3030 		cur_addr_num = 0;
3031 	}
3032 	/*
3033 	 * select the nth address from the list (where cur_addr_num is the
3034 	 * nth) and 0 is the first one, 1 is the second one etc...
3035 	 */
3036 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3037 
3038 	sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3039 	    dest_is_priv, cur_addr_num, fam, ro);
3040 
3041 	/* if sctp_ifa is NULL something changed??, fall to plan b. */
3042 	if (sctp_ifa) {
3043 		atomic_add_int(&sctp_ifa->refcount, 1);
3044 		if (net) {
3045 			/* save off where the next one we will want */
3046 			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3047 		}
3048 		return (sctp_ifa);
3049 	}
3050 	/*
3051 	 * plan_b: Look at all interfaces and find a preferred address. If
3052 	 * no preferred fall through to plan_c.
3053 	 */
3054 bound_all_plan_b:
3055 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3056 	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3057 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3058 		    sctp_ifn->ifn_name);
3059 		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3060 			/* wrong base scope */
3061 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3062 			continue;
3063 		}
3064 		if ((sctp_ifn == looked_at) && looked_at) {
3065 			/* already looked at this guy */
3066 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3067 			continue;
3068 		}
3069 		num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3070 		    dest_is_loop, dest_is_priv, fam);
3071 		SCTPDBG(SCTP_DEBUG_OUTPUT2,
3072 		    "Found ifn:%p %d preferred source addresses\n",
3073 		    ifn, num_preferred);
3074 		if (num_preferred == 0) {
3075 			/* None on this interface. */
3076 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3077 			continue;
3078 		}
3079 		SCTPDBG(SCTP_DEBUG_OUTPUT2,
3080 		    "num preferred:%d on interface:%p cur_addr_num:%d\n",
3081 		    num_preferred, (void *)sctp_ifn, cur_addr_num);
3082 
3083 		/*
3084 		 * Ok we have num_eligible_addr set with how many we can
3085 		 * use, this may vary from call to call due to addresses
3086 		 * being deprecated etc..
3087 		 */
3088 		if (cur_addr_num >= num_preferred) {
3089 			cur_addr_num = 0;
3090 		}
3091 		sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3092 		    dest_is_priv, cur_addr_num, fam, ro);
3093 		if (sifa == NULL)
3094 			continue;
3095 		if (net) {
3096 			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3097 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3098 			    cur_addr_num);
3099 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3100 			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3101 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3102 			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3103 		}
3104 		atomic_add_int(&sifa->refcount, 1);
3105 		return (sifa);
3106 	}
3107 #ifdef INET
3108 again_with_private_addresses_allowed:
3109 #endif
3110 	/* plan_c: do we have an acceptable address on the emit interface */
3111 	sifa = NULL;
3112 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3113 	if (emit_ifn == NULL) {
3114 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3115 		goto plan_d;
3116 	}
3117 	LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3118 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3119 #ifdef INET
3120 		if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3121 		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3122 		    &sctp_ifa->address.sin.sin_addr) != 0)) {
3123 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3124 			continue;
3125 		}
3126 #endif
3127 #ifdef INET6
3128 		if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3129 		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3130 		    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3131 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3132 			continue;
3133 		}
3134 #endif
3135 		if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3136 		    (non_asoc_addr_ok == 0)) {
3137 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3138 			continue;
3139 		}
3140 		sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3141 		    dest_is_priv, fam);
3142 		if (sifa == NULL) {
3143 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3144 			continue;
3145 		}
3146 		if (stcb) {
3147 			if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3148 				SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3149 				sifa = NULL;
3150 				continue;
3151 			}
3152 			if (((non_asoc_addr_ok == 0) &&
3153 			    (sctp_is_addr_restricted(stcb, sifa))) ||
3154 			    (non_asoc_addr_ok &&
3155 			    (sctp_is_addr_restricted(stcb, sifa)) &&
3156 			    (!sctp_is_addr_pending(stcb, sifa)))) {
3157 				/*
3158 				 * It is restricted for some reason..
3159 				 * probably not yet added.
3160 				 */
3161 				SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3162 				sifa = NULL;
3163 				continue;
3164 			}
3165 		}
3166 		atomic_add_int(&sifa->refcount, 1);
3167 		goto out;
3168 	}
3169 plan_d:
3170 	/*
3171 	 * plan_d: We are in trouble. No preferred address on the emit
3172 	 * interface. And not even a preferred address on all interfaces. Go
3173 	 * out and see if we can find an acceptable address somewhere
3174 	 * amongst all interfaces.
3175 	 */
3176 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3177 	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3178 		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3179 			/* wrong base scope */
3180 			continue;
3181 		}
3182 		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3183 #ifdef INET
3184 			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3185 			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3186 			    &sctp_ifa->address.sin.sin_addr) != 0)) {
3187 				continue;
3188 			}
3189 #endif
3190 #ifdef INET6
3191 			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3192 			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3193 			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3194 				continue;
3195 			}
3196 #endif
3197 			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3198 			    (non_asoc_addr_ok == 0))
3199 				continue;
3200 			sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3201 			    dest_is_loop,
3202 			    dest_is_priv, fam);
3203 			if (sifa == NULL)
3204 				continue;
3205 			if (stcb) {
3206 				if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3207 					sifa = NULL;
3208 					continue;
3209 				}
3210 				if (((non_asoc_addr_ok == 0) &&
3211 				    (sctp_is_addr_restricted(stcb, sifa))) ||
3212 				    (non_asoc_addr_ok &&
3213 				    (sctp_is_addr_restricted(stcb, sifa)) &&
3214 				    (!sctp_is_addr_pending(stcb, sifa)))) {
3215 					/*
3216 					 * It is restricted for some
3217 					 * reason.. probably not yet added.
3218 					 */
3219 					sifa = NULL;
3220 					continue;
3221 				}
3222 			}
3223 			goto out;
3224 		}
3225 	}
3226 #ifdef INET
3227 	if (stcb) {
3228 		if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3229 			stcb->asoc.scope.ipv4_local_scope = 1;
3230 			retried = 1;
3231 			goto again_with_private_addresses_allowed;
3232 		} else if (retried == 1) {
3233 			stcb->asoc.scope.ipv4_local_scope = 0;
3234 		}
3235 	}
3236 #endif
3237 out:
3238 #ifdef INET
3239 	if (sifa) {
3240 		if (retried == 1) {
3241 			LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3242 				if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3243 					/* wrong base scope */
3244 					continue;
3245 				}
3246 				LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3247 					struct sctp_ifa *tmp_sifa;
3248 
3249 #ifdef INET
3250 					if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3251 					    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3252 					    &sctp_ifa->address.sin.sin_addr) != 0)) {
3253 						continue;
3254 					}
3255 #endif
3256 #ifdef INET6
3257 					if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3258 					    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3259 					    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3260 						continue;
3261 					}
3262 #endif
3263 					if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3264 					    (non_asoc_addr_ok == 0))
3265 						continue;
3266 					tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3267 					    dest_is_loop,
3268 					    dest_is_priv, fam);
3269 					if (tmp_sifa == NULL) {
3270 						continue;
3271 					}
3272 					if (tmp_sifa == sifa) {
3273 						continue;
3274 					}
3275 					if (stcb) {
3276 						if (sctp_is_address_in_scope(tmp_sifa,
3277 						    &stcb->asoc.scope, 0) == 0) {
3278 							continue;
3279 						}
3280 						if (((non_asoc_addr_ok == 0) &&
3281 						    (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3282 						    (non_asoc_addr_ok &&
3283 						    (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3284 						    (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3285 							/*
3286 							 * It is restricted
3287 							 * for some reason..
3288 							 * probably not yet
3289 							 * added.
3290 							 */
3291 							continue;
3292 						}
3293 					}
3294 					if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3295 					    (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3296 						sctp_add_local_addr_restricted(stcb, tmp_sifa);
3297 					}
3298 				}
3299 			}
3300 		}
3301 		atomic_add_int(&sifa->refcount, 1);
3302 	}
3303 #endif
3304 	return (sifa);
3305 }
3306 
3307 
3308 
3309 /* tcb may be NULL */
3310 struct sctp_ifa *
3311 sctp_source_address_selection(struct sctp_inpcb *inp,
3312     struct sctp_tcb *stcb,
3313     sctp_route_t *ro,
3314     struct sctp_nets *net,
3315     int non_asoc_addr_ok, uint32_t vrf_id)
3316 {
3317 	struct sctp_ifa *answer;
3318 	uint8_t dest_is_priv, dest_is_loop;
3319 	sa_family_t fam;
3320 #ifdef INET
3321 	struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3322 #endif
3323 #ifdef INET6
3324 	struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3325 #endif
3326 
3327 	/**
3328 	 * Rules:
3329 	 * - Find the route if needed, cache if I can.
3330 	 * - Look at interface address in route, Is it in the bound list. If so we
3331 	 *   have the best source.
3332 	 * - If not we must rotate amongst the addresses.
3333 	 *
3334 	 * Cavets and issues
3335 	 *
3336 	 * Do we need to pay attention to scope. We can have a private address
3337 	 * or a global address we are sourcing or sending to. So if we draw
3338 	 * it out
3339 	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3340 	 * For V4
3341 	 * ------------------------------------------
3342 	 *      source     *      dest  *  result
3343 	 * -----------------------------------------
3344 	 * <a>  Private    *    Global  *  NAT
3345 	 * -----------------------------------------
3346 	 * <b>  Private    *    Private *  No problem
3347 	 * -----------------------------------------
3348 	 * <c>  Global     *    Private *  Huh, How will this work?
3349 	 * -----------------------------------------
3350 	 * <d>  Global     *    Global  *  No Problem
3351 	 *------------------------------------------
3352 	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3353 	 * For V6
3354 	 *------------------------------------------
3355 	 *      source     *      dest  *  result
3356 	 * -----------------------------------------
3357 	 * <a>  Linklocal  *    Global  *
3358 	 * -----------------------------------------
3359 	 * <b>  Linklocal  * Linklocal  *  No problem
3360 	 * -----------------------------------------
3361 	 * <c>  Global     * Linklocal  *  Huh, How will this work?
3362 	 * -----------------------------------------
3363 	 * <d>  Global     *    Global  *  No Problem
3364 	 *------------------------------------------
3365 	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3366 	 *
3367 	 * And then we add to that what happens if there are multiple addresses
3368 	 * assigned to an interface. Remember the ifa on a ifn is a linked
3369 	 * list of addresses. So one interface can have more than one IP
3370 	 * address. What happens if we have both a private and a global
3371 	 * address? Do we then use context of destination to sort out which
3372 	 * one is best? And what about NAT's sending P->G may get you a NAT
3373 	 * translation, or should you select the G thats on the interface in
3374 	 * preference.
3375 	 *
3376 	 * Decisions:
3377 	 *
3378 	 * - count the number of addresses on the interface.
3379 	 * - if it is one, no problem except case <c>.
3380 	 *   For <a> we will assume a NAT out there.
3381 	 * - if there are more than one, then we need to worry about scope P
3382 	 *   or G. We should prefer G -> G and P -> P if possible.
3383 	 *   Then as a secondary fall back to mixed types G->P being a last
3384 	 *   ditch one.
3385 	 * - The above all works for bound all, but bound specific we need to
3386 	 *   use the same concept but instead only consider the bound
3387 	 *   addresses. If the bound set is NOT assigned to the interface then
3388 	 *   we must use rotation amongst the bound addresses..
3389 	 */
3390 	if (ro->ro_rt == NULL) {
3391 		/*
3392 		 * Need a route to cache.
3393 		 */
3394 		SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3395 	}
3396 	if (ro->ro_rt == NULL) {
3397 		return (NULL);
3398 	}
3399 	fam = ro->ro_dst.sa_family;
3400 	dest_is_priv = dest_is_loop = 0;
3401 	/* Setup our scopes for the destination */
3402 	switch (fam) {
3403 #ifdef INET
3404 	case AF_INET:
3405 		/* Scope based on outbound address */
3406 		if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3407 			dest_is_loop = 1;
3408 			if (net != NULL) {
3409 				/* mark it as local */
3410 				net->addr_is_local = 1;
3411 			}
3412 		} else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3413 			dest_is_priv = 1;
3414 		}
3415 		break;
3416 #endif
3417 #ifdef INET6
3418 	case AF_INET6:
3419 		/* Scope based on outbound address */
3420 		if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3421 		    SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3422 			/*
3423 			 * If the address is a loopback address, which
3424 			 * consists of "::1" OR "fe80::1%lo0", we are
3425 			 * loopback scope. But we don't use dest_is_priv
3426 			 * (link local addresses).
3427 			 */
3428 			dest_is_loop = 1;
3429 			if (net != NULL) {
3430 				/* mark it as local */
3431 				net->addr_is_local = 1;
3432 			}
3433 		} else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3434 			dest_is_priv = 1;
3435 		}
3436 		break;
3437 #endif
3438 	}
3439 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3440 	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3441 	SCTP_IPI_ADDR_RLOCK();
3442 	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3443 		/*
3444 		 * Bound all case
3445 		 */
3446 		answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3447 		    dest_is_priv, dest_is_loop,
3448 		    non_asoc_addr_ok, fam);
3449 		SCTP_IPI_ADDR_RUNLOCK();
3450 		return (answer);
3451 	}
3452 	/*
3453 	 * Subset bound case
3454 	 */
3455 	if (stcb) {
3456 		answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3457 		    vrf_id, dest_is_priv,
3458 		    dest_is_loop,
3459 		    non_asoc_addr_ok, fam);
3460 	} else {
3461 		answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3462 		    non_asoc_addr_ok,
3463 		    dest_is_priv,
3464 		    dest_is_loop, fam);
3465 	}
3466 	SCTP_IPI_ADDR_RUNLOCK();
3467 	return (answer);
3468 }
3469 
3470 static int
3471 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3472 {
3473 	struct cmsghdr cmh;
3474 	struct sctp_sndinfo sndinfo;
3475 	struct sctp_prinfo prinfo;
3476 	struct sctp_authinfo authinfo;
3477 	int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3478 	int found;
3479 
3480 	/*
3481 	 * Independent of how many mbufs, find the c_type inside the control
3482 	 * structure and copy out the data.
3483 	 */
3484 	found = 0;
3485 	tot_len = SCTP_BUF_LEN(control);
3486 	for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3487 		rem_len = tot_len - off;
3488 		if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3489 			/* There is not enough room for one more. */
3490 			return (found);
3491 		}
3492 		m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3493 		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3494 			/* We dont't have a complete CMSG header. */
3495 			return (found);
3496 		}
3497 		if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3498 			/* We don't have the complete CMSG. */
3499 			return (found);
3500 		}
3501 		cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3502 		cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3503 		if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3504 		    ((c_type == cmh.cmsg_type) ||
3505 		    ((c_type == SCTP_SNDRCV) &&
3506 		    ((cmh.cmsg_type == SCTP_SNDINFO) ||
3507 		    (cmh.cmsg_type == SCTP_PRINFO) ||
3508 		    (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3509 			if (c_type == cmh.cmsg_type) {
3510 				if (cpsize > INT_MAX) {
3511 					return (found);
3512 				}
3513 				if (cmsg_data_len < (int)cpsize) {
3514 					return (found);
3515 				}
3516 				/* It is exactly what we want. Copy it out. */
3517 				m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
3518 				return (1);
3519 			} else {
3520 				struct sctp_sndrcvinfo *sndrcvinfo;
3521 
3522 				sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3523 				if (found == 0) {
3524 					if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3525 						return (found);
3526 					}
3527 					memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3528 				}
3529 				switch (cmh.cmsg_type) {
3530 				case SCTP_SNDINFO:
3531 					if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
3532 						return (found);
3533 					}
3534 					m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3535 					sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3536 					sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3537 					sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3538 					sndrcvinfo->sinfo_context = sndinfo.snd_context;
3539 					sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3540 					break;
3541 				case SCTP_PRINFO:
3542 					if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
3543 						return (found);
3544 					}
3545 					m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3546 					if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3547 						sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3548 					} else {
3549 						sndrcvinfo->sinfo_timetolive = 0;
3550 					}
3551 					sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3552 					break;
3553 				case SCTP_AUTHINFO:
3554 					if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
3555 						return (found);
3556 					}
3557 					m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3558 					sndrcvinfo->sinfo_keynumber_valid = 1;
3559 					sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3560 					break;
3561 				default:
3562 					return (found);
3563 				}
3564 				found = 1;
3565 			}
3566 		}
3567 	}
3568 	return (found);
3569 }
3570 
3571 static int
3572 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3573 {
3574 	struct cmsghdr cmh;
3575 	struct sctp_initmsg initmsg;
3576 #ifdef INET
3577 	struct sockaddr_in sin;
3578 #endif
3579 #ifdef INET6
3580 	struct sockaddr_in6 sin6;
3581 #endif
3582 	int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3583 
3584 	tot_len = SCTP_BUF_LEN(control);
3585 	for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3586 		rem_len = tot_len - off;
3587 		if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3588 			/* There is not enough room for one more. */
3589 			*error = EINVAL;
3590 			return (1);
3591 		}
3592 		m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3593 		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3594 			/* We dont't have a complete CMSG header. */
3595 			*error = EINVAL;
3596 			return (1);
3597 		}
3598 		if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3599 			/* We don't have the complete CMSG. */
3600 			*error = EINVAL;
3601 			return (1);
3602 		}
3603 		cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3604 		cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3605 		if (cmh.cmsg_level == IPPROTO_SCTP) {
3606 			switch (cmh.cmsg_type) {
3607 			case SCTP_INIT:
3608 				if (cmsg_data_len < (int)sizeof(struct sctp_initmsg)) {
3609 					*error = EINVAL;
3610 					return (1);
3611 				}
3612 				m_copydata(control, cmsg_data_off, sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3613 				if (initmsg.sinit_max_attempts)
3614 					stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3615 				if (initmsg.sinit_num_ostreams)
3616 					stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3617 				if (initmsg.sinit_max_instreams)
3618 					stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3619 				if (initmsg.sinit_max_init_timeo)
3620 					stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3621 				if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3622 					struct sctp_stream_out *tmp_str;
3623 					unsigned int i;
3624 #if defined(SCTP_DETAILED_STR_STATS)
3625 					int j;
3626 #endif
3627 
3628 					/* Default is NOT correct */
3629 					SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3630 					    stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3631 					SCTP_TCB_UNLOCK(stcb);
3632 					SCTP_MALLOC(tmp_str,
3633 					    struct sctp_stream_out *,
3634 					    (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3635 					    SCTP_M_STRMO);
3636 					SCTP_TCB_LOCK(stcb);
3637 					if (tmp_str != NULL) {
3638 						SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3639 						stcb->asoc.strmout = tmp_str;
3640 						stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3641 					} else {
3642 						stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3643 					}
3644 					for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3645 						TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3646 						stcb->asoc.strmout[i].chunks_on_queues = 0;
3647 						stcb->asoc.strmout[i].next_mid_ordered = 0;
3648 						stcb->asoc.strmout[i].next_mid_unordered = 0;
3649 #if defined(SCTP_DETAILED_STR_STATS)
3650 						for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3651 							stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3652 							stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3653 						}
3654 #else
3655 						stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3656 						stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3657 #endif
3658 						stcb->asoc.strmout[i].sid = i;
3659 						stcb->asoc.strmout[i].last_msg_incomplete = 0;
3660 						stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3661 						stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3662 					}
3663 				}
3664 				break;
3665 #ifdef INET
3666 			case SCTP_DSTADDRV4:
3667 				if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3668 					*error = EINVAL;
3669 					return (1);
3670 				}
3671 				memset(&sin, 0, sizeof(struct sockaddr_in));
3672 				sin.sin_family = AF_INET;
3673 				sin.sin_len = sizeof(struct sockaddr_in);
3674 				sin.sin_port = stcb->rport;
3675 				m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3676 				if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3677 				    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3678 				    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3679 					*error = EINVAL;
3680 					return (1);
3681 				}
3682 				if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3683 				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3684 					*error = ENOBUFS;
3685 					return (1);
3686 				}
3687 				break;
3688 #endif
3689 #ifdef INET6
3690 			case SCTP_DSTADDRV6:
3691 				if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3692 					*error = EINVAL;
3693 					return (1);
3694 				}
3695 				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3696 				sin6.sin6_family = AF_INET6;
3697 				sin6.sin6_len = sizeof(struct sockaddr_in6);
3698 				sin6.sin6_port = stcb->rport;
3699 				m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3700 				if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3701 				    IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3702 					*error = EINVAL;
3703 					return (1);
3704 				}
3705 #ifdef INET
3706 				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3707 					in6_sin6_2_sin(&sin, &sin6);
3708 					if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3709 					    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3710 					    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3711 						*error = EINVAL;
3712 						return (1);
3713 					}
3714 					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3715 					    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3716 						*error = ENOBUFS;
3717 						return (1);
3718 					}
3719 				} else
3720 #endif
3721 					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3722 				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3723 					*error = ENOBUFS;
3724 					return (1);
3725 				}
3726 				break;
3727 #endif
3728 			default:
3729 				break;
3730 			}
3731 		}
3732 	}
3733 	return (0);
3734 }
3735 
3736 #if defined(INET) || defined(INET6)
3737 static struct sctp_tcb *
3738 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3739     uint16_t port,
3740     struct mbuf *control,
3741     struct sctp_nets **net_p,
3742     int *error)
3743 {
3744 	struct cmsghdr cmh;
3745 	struct sctp_tcb *stcb;
3746 	struct sockaddr *addr;
3747 #ifdef INET
3748 	struct sockaddr_in sin;
3749 #endif
3750 #ifdef INET6
3751 	struct sockaddr_in6 sin6;
3752 #endif
3753 	int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
3754 
3755 	tot_len = SCTP_BUF_LEN(control);
3756 	for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
3757 		rem_len = tot_len - off;
3758 		if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
3759 			/* There is not enough room for one more. */
3760 			*error = EINVAL;
3761 			return (NULL);
3762 		}
3763 		m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
3764 		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3765 			/* We dont't have a complete CMSG header. */
3766 			*error = EINVAL;
3767 			return (NULL);
3768 		}
3769 		if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
3770 			/* We don't have the complete CMSG. */
3771 			*error = EINVAL;
3772 			return (NULL);
3773 		}
3774 		cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
3775 		cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
3776 		if (cmh.cmsg_level == IPPROTO_SCTP) {
3777 			switch (cmh.cmsg_type) {
3778 #ifdef INET
3779 			case SCTP_DSTADDRV4:
3780 				if (cmsg_data_len < (int)sizeof(struct in_addr)) {
3781 					*error = EINVAL;
3782 					return (NULL);
3783 				}
3784 				memset(&sin, 0, sizeof(struct sockaddr_in));
3785 				sin.sin_family = AF_INET;
3786 				sin.sin_len = sizeof(struct sockaddr_in);
3787 				sin.sin_port = port;
3788 				m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3789 				addr = (struct sockaddr *)&sin;
3790 				break;
3791 #endif
3792 #ifdef INET6
3793 			case SCTP_DSTADDRV6:
3794 				if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
3795 					*error = EINVAL;
3796 					return (NULL);
3797 				}
3798 				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3799 				sin6.sin6_family = AF_INET6;
3800 				sin6.sin6_len = sizeof(struct sockaddr_in6);
3801 				sin6.sin6_port = port;
3802 				m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3803 #ifdef INET
3804 				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3805 					in6_sin6_2_sin(&sin, &sin6);
3806 					addr = (struct sockaddr *)&sin;
3807 				} else
3808 #endif
3809 					addr = (struct sockaddr *)&sin6;
3810 				break;
3811 #endif
3812 			default:
3813 				addr = NULL;
3814 				break;
3815 			}
3816 			if (addr) {
3817 				stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3818 				if (stcb != NULL) {
3819 					return (stcb);
3820 				}
3821 			}
3822 		}
3823 	}
3824 	return (NULL);
3825 }
3826 #endif
3827 
3828 static struct mbuf *
3829 sctp_add_cookie(struct mbuf *init, int init_offset,
3830     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3831 {
3832 	struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3833 	struct sctp_state_cookie *stc;
3834 	struct sctp_paramhdr *ph;
3835 	uint8_t *foo;
3836 	int sig_offset;
3837 	uint16_t cookie_sz;
3838 
3839 	mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3840 	    sizeof(struct sctp_paramhdr)), 0,
3841 	    M_NOWAIT, 1, MT_DATA);
3842 	if (mret == NULL) {
3843 		return (NULL);
3844 	}
3845 	copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3846 	if (copy_init == NULL) {
3847 		sctp_m_freem(mret);
3848 		return (NULL);
3849 	}
3850 #ifdef SCTP_MBUF_LOGGING
3851 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3852 		sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3853 	}
3854 #endif
3855 	copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3856 	    M_NOWAIT);
3857 	if (copy_initack == NULL) {
3858 		sctp_m_freem(mret);
3859 		sctp_m_freem(copy_init);
3860 		return (NULL);
3861 	}
3862 #ifdef SCTP_MBUF_LOGGING
3863 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3864 		sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3865 	}
3866 #endif
3867 	/* easy side we just drop it on the end */
3868 	ph = mtod(mret, struct sctp_paramhdr *);
3869 	SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3870 	    sizeof(struct sctp_paramhdr);
3871 	stc = (struct sctp_state_cookie *)((caddr_t)ph +
3872 	    sizeof(struct sctp_paramhdr));
3873 	ph->param_type = htons(SCTP_STATE_COOKIE);
3874 	ph->param_length = 0;	/* fill in at the end */
3875 	/* Fill in the stc cookie data */
3876 	memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3877 
3878 	/* tack the INIT and then the INIT-ACK onto the chain */
3879 	cookie_sz = 0;
3880 	for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3881 		cookie_sz += SCTP_BUF_LEN(m_at);
3882 		if (SCTP_BUF_NEXT(m_at) == NULL) {
3883 			SCTP_BUF_NEXT(m_at) = copy_init;
3884 			break;
3885 		}
3886 	}
3887 	for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3888 		cookie_sz += SCTP_BUF_LEN(m_at);
3889 		if (SCTP_BUF_NEXT(m_at) == NULL) {
3890 			SCTP_BUF_NEXT(m_at) = copy_initack;
3891 			break;
3892 		}
3893 	}
3894 	for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3895 		cookie_sz += SCTP_BUF_LEN(m_at);
3896 		if (SCTP_BUF_NEXT(m_at) == NULL) {
3897 			break;
3898 		}
3899 	}
3900 	sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3901 	if (sig == NULL) {
3902 		/* no space, so free the entire chain */
3903 		sctp_m_freem(mret);
3904 		return (NULL);
3905 	}
3906 	SCTP_BUF_LEN(sig) = 0;
3907 	SCTP_BUF_NEXT(m_at) = sig;
3908 	sig_offset = 0;
3909 	foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3910 	memset(foo, 0, SCTP_SIGNATURE_SIZE);
3911 	*signature = foo;
3912 	SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3913 	cookie_sz += SCTP_SIGNATURE_SIZE;
3914 	ph->param_length = htons(cookie_sz);
3915 	return (mret);
3916 }
3917 
3918 
3919 static uint8_t
3920 sctp_get_ect(struct sctp_tcb *stcb)
3921 {
3922 	if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3923 		return (SCTP_ECT0_BIT);
3924 	} else {
3925 		return (0);
3926 	}
3927 }
3928 
3929 #if defined(INET) || defined(INET6)
3930 static void
3931 sctp_handle_no_route(struct sctp_tcb *stcb,
3932     struct sctp_nets *net,
3933     int so_locked)
3934 {
3935 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3936 
3937 	if (net) {
3938 		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3939 		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3940 		if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3941 			if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3942 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3943 				sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3944 				    stcb, 0,
3945 				    (void *)net,
3946 				    so_locked);
3947 				net->dest_state &= ~SCTP_ADDR_REACHABLE;
3948 				net->dest_state &= ~SCTP_ADDR_PF;
3949 			}
3950 		}
3951 		if (stcb) {
3952 			if (net == stcb->asoc.primary_destination) {
3953 				/* need a new primary */
3954 				struct sctp_nets *alt;
3955 
3956 				alt = sctp_find_alternate_net(stcb, net, 0);
3957 				if (alt != net) {
3958 					if (stcb->asoc.alternate) {
3959 						sctp_free_remote_addr(stcb->asoc.alternate);
3960 					}
3961 					stcb->asoc.alternate = alt;
3962 					atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3963 					if (net->ro._s_addr) {
3964 						sctp_free_ifa(net->ro._s_addr);
3965 						net->ro._s_addr = NULL;
3966 					}
3967 					net->src_addr_selected = 0;
3968 				}
3969 			}
3970 		}
3971 	}
3972 }
3973 #endif
3974 
3975 static int
3976 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3977     struct sctp_tcb *stcb,	/* may be NULL */
3978     struct sctp_nets *net,
3979     struct sockaddr *to,
3980     struct mbuf *m,
3981     uint32_t auth_offset,
3982     struct sctp_auth_chunk *auth,
3983     uint16_t auth_keyid,
3984     int nofragment_flag,
3985     int ecn_ok,
3986     int out_of_asoc_ok,
3987     uint16_t src_port,
3988     uint16_t dest_port,
3989     uint32_t v_tag,
3990     uint16_t port,
3991     union sctp_sockstore *over_addr,
3992     uint8_t mflowtype, uint32_t mflowid,
3993 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3994     int so_locked SCTP_UNUSED
3995 #else
3996     int so_locked
3997 #endif
3998 )
3999 {
4000 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
4001 	/**
4002 	 * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
4003 	 * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
4004 	 * - fill in the HMAC digest of any AUTH chunk in the packet.
4005 	 * - calculate and fill in the SCTP checksum.
4006 	 * - prepend an IP address header.
4007 	 * - if boundall use INADDR_ANY.
4008 	 * - if boundspecific do source address selection.
4009 	 * - set fragmentation option for ipV4.
4010 	 * - On return from IP output, check/adjust mtu size of output
4011 	 *   interface and smallest_mtu size as well.
4012 	 */
4013 	/* Will need ifdefs around this */
4014 	struct mbuf *newm;
4015 	struct sctphdr *sctphdr;
4016 	int packet_length;
4017 	int ret;
4018 #if defined(INET) || defined(INET6)
4019 	uint32_t vrf_id;
4020 #endif
4021 #if defined(INET) || defined(INET6)
4022 	struct mbuf *o_pak;
4023 	sctp_route_t *ro = NULL;
4024 	struct udphdr *udp = NULL;
4025 #endif
4026 	uint8_t tos_value;
4027 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4028 	struct socket *so = NULL;
4029 #endif
4030 
4031 	if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4032 		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4033 		sctp_m_freem(m);
4034 		return (EFAULT);
4035 	}
4036 #if defined(INET) || defined(INET6)
4037 	if (stcb) {
4038 		vrf_id = stcb->asoc.vrf_id;
4039 	} else {
4040 		vrf_id = inp->def_vrf_id;
4041 	}
4042 #endif
4043 	/* fill in the HMAC digest for any AUTH chunk in the packet */
4044 	if ((auth != NULL) && (stcb != NULL)) {
4045 		sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4046 	}
4047 
4048 	if (net) {
4049 		tos_value = net->dscp;
4050 	} else if (stcb) {
4051 		tos_value = stcb->asoc.default_dscp;
4052 	} else {
4053 		tos_value = inp->sctp_ep.default_dscp;
4054 	}
4055 
4056 	switch (to->sa_family) {
4057 #ifdef INET
4058 	case AF_INET:
4059 		{
4060 			struct ip *ip = NULL;
4061 			sctp_route_t iproute;
4062 			int len;
4063 
4064 			len = SCTP_MIN_V4_OVERHEAD;
4065 			if (port) {
4066 				len += sizeof(struct udphdr);
4067 			}
4068 			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4069 			if (newm == NULL) {
4070 				sctp_m_freem(m);
4071 				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4072 				return (ENOMEM);
4073 			}
4074 			SCTP_ALIGN_TO_END(newm, len);
4075 			SCTP_BUF_LEN(newm) = len;
4076 			SCTP_BUF_NEXT(newm) = m;
4077 			m = newm;
4078 			if (net != NULL) {
4079 				m->m_pkthdr.flowid = net->flowid;
4080 				M_HASHTYPE_SET(m, net->flowtype);
4081 			} else {
4082 				m->m_pkthdr.flowid = mflowid;
4083 				M_HASHTYPE_SET(m, mflowtype);
4084 			}
4085 			packet_length = sctp_calculate_len(m);
4086 			ip = mtod(m, struct ip *);
4087 			ip->ip_v = IPVERSION;
4088 			ip->ip_hl = (sizeof(struct ip) >> 2);
4089 			if (tos_value == 0) {
4090 				/*
4091 				 * This means especially, that it is not set
4092 				 * at the SCTP layer. So use the value from
4093 				 * the IP layer.
4094 				 */
4095 				tos_value = inp->ip_inp.inp.inp_ip_tos;
4096 			}
4097 			tos_value &= 0xfc;
4098 			if (ecn_ok) {
4099 				tos_value |= sctp_get_ect(stcb);
4100 			}
4101 			if ((nofragment_flag) && (port == 0)) {
4102 				ip->ip_off = htons(IP_DF);
4103 			} else {
4104 				ip->ip_off = htons(0);
4105 			}
4106 			/* FreeBSD has a function for ip_id's */
4107 			ip_fillid(ip);
4108 
4109 			ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4110 			ip->ip_len = htons(packet_length);
4111 			ip->ip_tos = tos_value;
4112 			if (port) {
4113 				ip->ip_p = IPPROTO_UDP;
4114 			} else {
4115 				ip->ip_p = IPPROTO_SCTP;
4116 			}
4117 			ip->ip_sum = 0;
4118 			if (net == NULL) {
4119 				ro = &iproute;
4120 				memset(&iproute, 0, sizeof(iproute));
4121 				memcpy(&ro->ro_dst, to, to->sa_len);
4122 			} else {
4123 				ro = (sctp_route_t *)&net->ro;
4124 			}
4125 			/* Now the address selection part */
4126 			ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4127 
4128 			/* call the routine to select the src address */
4129 			if (net && out_of_asoc_ok == 0) {
4130 				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4131 					sctp_free_ifa(net->ro._s_addr);
4132 					net->ro._s_addr = NULL;
4133 					net->src_addr_selected = 0;
4134 					if (ro->ro_rt) {
4135 						RTFREE(ro->ro_rt);
4136 						ro->ro_rt = NULL;
4137 					}
4138 				}
4139 				if (net->src_addr_selected == 0) {
4140 					/* Cache the source address */
4141 					net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4142 					    ro, net, 0,
4143 					    vrf_id);
4144 					net->src_addr_selected = 1;
4145 				}
4146 				if (net->ro._s_addr == NULL) {
4147 					/* No route to host */
4148 					net->src_addr_selected = 0;
4149 					sctp_handle_no_route(stcb, net, so_locked);
4150 					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4151 					sctp_m_freem(m);
4152 					return (EHOSTUNREACH);
4153 				}
4154 				ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4155 			} else {
4156 				if (over_addr == NULL) {
4157 					struct sctp_ifa *_lsrc;
4158 
4159 					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4160 					    net,
4161 					    out_of_asoc_ok,
4162 					    vrf_id);
4163 					if (_lsrc == NULL) {
4164 						sctp_handle_no_route(stcb, net, so_locked);
4165 						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4166 						sctp_m_freem(m);
4167 						return (EHOSTUNREACH);
4168 					}
4169 					ip->ip_src = _lsrc->address.sin.sin_addr;
4170 					sctp_free_ifa(_lsrc);
4171 				} else {
4172 					ip->ip_src = over_addr->sin.sin_addr;
4173 					SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4174 				}
4175 			}
4176 			if (port) {
4177 				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4178 					sctp_handle_no_route(stcb, net, so_locked);
4179 					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4180 					sctp_m_freem(m);
4181 					return (EHOSTUNREACH);
4182 				}
4183 				udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4184 				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4185 				udp->uh_dport = port;
4186 				udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4187 				if (V_udp_cksum) {
4188 					udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4189 				} else {
4190 					udp->uh_sum = 0;
4191 				}
4192 				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4193 			} else {
4194 				sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4195 			}
4196 
4197 			sctphdr->src_port = src_port;
4198 			sctphdr->dest_port = dest_port;
4199 			sctphdr->v_tag = v_tag;
4200 			sctphdr->checksum = 0;
4201 
4202 			/*
4203 			 * If source address selection fails and we find no
4204 			 * route then the ip_output should fail as well with
4205 			 * a NO_ROUTE_TO_HOST type error. We probably should
4206 			 * catch that somewhere and abort the association
4207 			 * right away (assuming this is an INIT being sent).
4208 			 */
4209 			if (ro->ro_rt == NULL) {
4210 				/*
4211 				 * src addr selection failed to find a route
4212 				 * (or valid source addr), so we can't get
4213 				 * there from here (yet)!
4214 				 */
4215 				sctp_handle_no_route(stcb, net, so_locked);
4216 				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4217 				sctp_m_freem(m);
4218 				return (EHOSTUNREACH);
4219 			}
4220 			if (ro != &iproute) {
4221 				memcpy(&iproute, ro, sizeof(*ro));
4222 			}
4223 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4224 			    (uint32_t)(ntohl(ip->ip_src.s_addr)));
4225 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4226 			    (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4227 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4228 			    (void *)ro->ro_rt);
4229 
4230 			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4231 				/* failed to prepend data, give up */
4232 				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4233 				sctp_m_freem(m);
4234 				return (ENOMEM);
4235 			}
4236 			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4237 			if (port) {
4238 				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4239 				SCTP_STAT_INCR(sctps_sendswcrc);
4240 				if (V_udp_cksum) {
4241 					SCTP_ENABLE_UDP_CSUM(o_pak);
4242 				}
4243 			} else {
4244 				m->m_pkthdr.csum_flags = CSUM_SCTP;
4245 				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4246 				SCTP_STAT_INCR(sctps_sendhwcrc);
4247 			}
4248 #ifdef SCTP_PACKET_LOGGING
4249 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4250 				sctp_packet_log(o_pak);
4251 #endif
4252 			/* send it out.  table id is taken from stcb */
4253 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4254 			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4255 				so = SCTP_INP_SO(inp);
4256 				SCTP_SOCKET_UNLOCK(so, 0);
4257 			}
4258 #endif
4259 			SCTP_PROBE5(send, NULL, stcb, ip, stcb, sctphdr);
4260 			SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4261 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4262 			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4263 				atomic_add_int(&stcb->asoc.refcnt, 1);
4264 				SCTP_TCB_UNLOCK(stcb);
4265 				SCTP_SOCKET_LOCK(so, 0);
4266 				SCTP_TCB_LOCK(stcb);
4267 				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4268 			}
4269 #endif
4270 			if (port) {
4271 				UDPSTAT_INC(udps_opackets);
4272 			}
4273 			SCTP_STAT_INCR(sctps_sendpackets);
4274 			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4275 			if (ret)
4276 				SCTP_STAT_INCR(sctps_senderrors);
4277 
4278 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4279 			if (net == NULL) {
4280 				/* free tempy routes */
4281 				RO_RTFREE(ro);
4282 			} else {
4283 				if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4284 				    ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4285 					uint32_t mtu;
4286 
4287 					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4288 					if (mtu > 0) {
4289 						if (net->port) {
4290 							mtu -= sizeof(struct udphdr);
4291 						}
4292 						if (mtu < net->mtu) {
4293 							if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4294 								sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4295 							}
4296 							net->mtu = mtu;
4297 						}
4298 					}
4299 				} else if (ro->ro_rt == NULL) {
4300 					/* route was freed */
4301 					if (net->ro._s_addr &&
4302 					    net->src_addr_selected) {
4303 						sctp_free_ifa(net->ro._s_addr);
4304 						net->ro._s_addr = NULL;
4305 					}
4306 					net->src_addr_selected = 0;
4307 				}
4308 			}
4309 			return (ret);
4310 		}
4311 #endif
4312 #ifdef INET6
4313 	case AF_INET6:
4314 		{
4315 			uint32_t flowlabel, flowinfo;
4316 			struct ip6_hdr *ip6h;
4317 			struct route_in6 ip6route;
4318 			struct ifnet *ifp;
4319 			struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4320 			int prev_scope = 0;
4321 			struct sockaddr_in6 lsa6_storage;
4322 			int error;
4323 			u_short prev_port = 0;
4324 			int len;
4325 
4326 			if (net) {
4327 				flowlabel = net->flowlabel;
4328 			} else if (stcb) {
4329 				flowlabel = stcb->asoc.default_flowlabel;
4330 			} else {
4331 				flowlabel = inp->sctp_ep.default_flowlabel;
4332 			}
4333 			if (flowlabel == 0) {
4334 				/*
4335 				 * This means especially, that it is not set
4336 				 * at the SCTP layer. So use the value from
4337 				 * the IP layer.
4338 				 */
4339 				flowlabel = ntohl(((struct inpcb *)inp)->inp_flow);
4340 			}
4341 			flowlabel &= 0x000fffff;
4342 			len = SCTP_MIN_OVERHEAD;
4343 			if (port) {
4344 				len += sizeof(struct udphdr);
4345 			}
4346 			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4347 			if (newm == NULL) {
4348 				sctp_m_freem(m);
4349 				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4350 				return (ENOMEM);
4351 			}
4352 			SCTP_ALIGN_TO_END(newm, len);
4353 			SCTP_BUF_LEN(newm) = len;
4354 			SCTP_BUF_NEXT(newm) = m;
4355 			m = newm;
4356 			if (net != NULL) {
4357 				m->m_pkthdr.flowid = net->flowid;
4358 				M_HASHTYPE_SET(m, net->flowtype);
4359 			} else {
4360 				m->m_pkthdr.flowid = mflowid;
4361 				M_HASHTYPE_SET(m, mflowtype);
4362 			}
4363 			packet_length = sctp_calculate_len(m);
4364 
4365 			ip6h = mtod(m, struct ip6_hdr *);
4366 			/* protect *sin6 from overwrite */
4367 			sin6 = (struct sockaddr_in6 *)to;
4368 			tmp = *sin6;
4369 			sin6 = &tmp;
4370 
4371 			/* KAME hack: embed scopeid */
4372 			if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4373 				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4374 				sctp_m_freem(m);
4375 				return (EINVAL);
4376 			}
4377 			if (net == NULL) {
4378 				memset(&ip6route, 0, sizeof(ip6route));
4379 				ro = (sctp_route_t *)&ip6route;
4380 				memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4381 			} else {
4382 				ro = (sctp_route_t *)&net->ro;
4383 			}
4384 			/*
4385 			 * We assume here that inp_flow is in host byte
4386 			 * order within the TCB!
4387 			 */
4388 			if (tos_value == 0) {
4389 				/*
4390 				 * This means especially, that it is not set
4391 				 * at the SCTP layer. So use the value from
4392 				 * the IP layer.
4393 				 */
4394 				tos_value = (ntohl(((struct inpcb *)inp)->inp_flow) >> 20) & 0xff;
4395 			}
4396 			tos_value &= 0xfc;
4397 			if (ecn_ok) {
4398 				tos_value |= sctp_get_ect(stcb);
4399 			}
4400 			flowinfo = 0x06;
4401 			flowinfo <<= 8;
4402 			flowinfo |= tos_value;
4403 			flowinfo <<= 20;
4404 			flowinfo |= flowlabel;
4405 			ip6h->ip6_flow = htonl(flowinfo);
4406 			if (port) {
4407 				ip6h->ip6_nxt = IPPROTO_UDP;
4408 			} else {
4409 				ip6h->ip6_nxt = IPPROTO_SCTP;
4410 			}
4411 			ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4412 			ip6h->ip6_dst = sin6->sin6_addr;
4413 
4414 			/*
4415 			 * Add SRC address selection here: we can only reuse
4416 			 * to a limited degree the kame src-addr-sel, since
4417 			 * we can try their selection but it may not be
4418 			 * bound.
4419 			 */
4420 			memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
4421 			lsa6_tmp.sin6_family = AF_INET6;
4422 			lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4423 			lsa6 = &lsa6_tmp;
4424 			if (net && out_of_asoc_ok == 0) {
4425 				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4426 					sctp_free_ifa(net->ro._s_addr);
4427 					net->ro._s_addr = NULL;
4428 					net->src_addr_selected = 0;
4429 					if (ro->ro_rt) {
4430 						RTFREE(ro->ro_rt);
4431 						ro->ro_rt = NULL;
4432 					}
4433 				}
4434 				if (net->src_addr_selected == 0) {
4435 					sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4436 					/* KAME hack: embed scopeid */
4437 					if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4438 						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4439 						sctp_m_freem(m);
4440 						return (EINVAL);
4441 					}
4442 					/* Cache the source address */
4443 					net->ro._s_addr = sctp_source_address_selection(inp,
4444 					    stcb,
4445 					    ro,
4446 					    net,
4447 					    0,
4448 					    vrf_id);
4449 					(void)sa6_recoverscope(sin6);
4450 					net->src_addr_selected = 1;
4451 				}
4452 				if (net->ro._s_addr == NULL) {
4453 					SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4454 					net->src_addr_selected = 0;
4455 					sctp_handle_no_route(stcb, net, so_locked);
4456 					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4457 					sctp_m_freem(m);
4458 					return (EHOSTUNREACH);
4459 				}
4460 				lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4461 			} else {
4462 				sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4463 				/* KAME hack: embed scopeid */
4464 				if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4465 					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4466 					sctp_m_freem(m);
4467 					return (EINVAL);
4468 				}
4469 				if (over_addr == NULL) {
4470 					struct sctp_ifa *_lsrc;
4471 
4472 					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4473 					    net,
4474 					    out_of_asoc_ok,
4475 					    vrf_id);
4476 					if (_lsrc == NULL) {
4477 						sctp_handle_no_route(stcb, net, so_locked);
4478 						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4479 						sctp_m_freem(m);
4480 						return (EHOSTUNREACH);
4481 					}
4482 					lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4483 					sctp_free_ifa(_lsrc);
4484 				} else {
4485 					lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4486 					SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4487 				}
4488 				(void)sa6_recoverscope(sin6);
4489 			}
4490 			lsa6->sin6_port = inp->sctp_lport;
4491 
4492 			if (ro->ro_rt == NULL) {
4493 				/*
4494 				 * src addr selection failed to find a route
4495 				 * (or valid source addr), so we can't get
4496 				 * there from here!
4497 				 */
4498 				sctp_handle_no_route(stcb, net, so_locked);
4499 				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4500 				sctp_m_freem(m);
4501 				return (EHOSTUNREACH);
4502 			}
4503 			/*
4504 			 * XXX: sa6 may not have a valid sin6_scope_id in
4505 			 * the non-SCOPEDROUTING case.
4506 			 */
4507 			memset(&lsa6_storage, 0, sizeof(lsa6_storage));
4508 			lsa6_storage.sin6_family = AF_INET6;
4509 			lsa6_storage.sin6_len = sizeof(lsa6_storage);
4510 			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4511 			if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4512 				SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4513 				sctp_m_freem(m);
4514 				return (error);
4515 			}
4516 			/* XXX */
4517 			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4518 			lsa6_storage.sin6_port = inp->sctp_lport;
4519 			lsa6 = &lsa6_storage;
4520 			ip6h->ip6_src = lsa6->sin6_addr;
4521 
4522 			if (port) {
4523 				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4524 					sctp_handle_no_route(stcb, net, so_locked);
4525 					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4526 					sctp_m_freem(m);
4527 					return (EHOSTUNREACH);
4528 				}
4529 				udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4530 				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4531 				udp->uh_dport = port;
4532 				udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4533 				udp->uh_sum = 0;
4534 				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4535 			} else {
4536 				sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4537 			}
4538 
4539 			sctphdr->src_port = src_port;
4540 			sctphdr->dest_port = dest_port;
4541 			sctphdr->v_tag = v_tag;
4542 			sctphdr->checksum = 0;
4543 
4544 			/*
4545 			 * We set the hop limit now since there is a good
4546 			 * chance that our ro pointer is now filled
4547 			 */
4548 			ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4549 			ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4550 
4551 #ifdef SCTP_DEBUG
4552 			/* Copy to be sure something bad is not happening */
4553 			sin6->sin6_addr = ip6h->ip6_dst;
4554 			lsa6->sin6_addr = ip6h->ip6_src;
4555 #endif
4556 
4557 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4558 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4559 			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4560 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4561 			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4562 			if (net) {
4563 				sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4564 				/*
4565 				 * preserve the port and scope for link
4566 				 * local send
4567 				 */
4568 				prev_scope = sin6->sin6_scope_id;
4569 				prev_port = sin6->sin6_port;
4570 			}
4571 
4572 			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4573 				/* failed to prepend data, give up */
4574 				sctp_m_freem(m);
4575 				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4576 				return (ENOMEM);
4577 			}
4578 			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4579 			if (port) {
4580 				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4581 				SCTP_STAT_INCR(sctps_sendswcrc);
4582 				if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4583 					udp->uh_sum = 0xffff;
4584 				}
4585 			} else {
4586 				m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4587 				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4588 				SCTP_STAT_INCR(sctps_sendhwcrc);
4589 			}
4590 			/* send it out. table id is taken from stcb */
4591 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4592 			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4593 				so = SCTP_INP_SO(inp);
4594 				SCTP_SOCKET_UNLOCK(so, 0);
4595 			}
4596 #endif
4597 #ifdef SCTP_PACKET_LOGGING
4598 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4599 				sctp_packet_log(o_pak);
4600 #endif
4601 			SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
4602 			SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4603 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4604 			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4605 				atomic_add_int(&stcb->asoc.refcnt, 1);
4606 				SCTP_TCB_UNLOCK(stcb);
4607 				SCTP_SOCKET_LOCK(so, 0);
4608 				SCTP_TCB_LOCK(stcb);
4609 				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4610 			}
4611 #endif
4612 			if (net) {
4613 				/* for link local this must be done */
4614 				sin6->sin6_scope_id = prev_scope;
4615 				sin6->sin6_port = prev_port;
4616 			}
4617 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4618 			if (port) {
4619 				UDPSTAT_INC(udps_opackets);
4620 			}
4621 			SCTP_STAT_INCR(sctps_sendpackets);
4622 			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4623 			if (ret) {
4624 				SCTP_STAT_INCR(sctps_senderrors);
4625 			}
4626 			if (net == NULL) {
4627 				/* Now if we had a temp route free it */
4628 				RO_RTFREE(ro);
4629 			} else {
4630 				/*
4631 				 * PMTU check versus smallest asoc MTU goes
4632 				 * here
4633 				 */
4634 				if (ro->ro_rt == NULL) {
4635 					/* Route was freed */
4636 					if (net->ro._s_addr &&
4637 					    net->src_addr_selected) {
4638 						sctp_free_ifa(net->ro._s_addr);
4639 						net->ro._s_addr = NULL;
4640 					}
4641 					net->src_addr_selected = 0;
4642 				}
4643 				if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
4644 				    ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
4645 					uint32_t mtu;
4646 
4647 					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4648 					if (mtu > 0) {
4649 						if (net->port) {
4650 							mtu -= sizeof(struct udphdr);
4651 						}
4652 						if (mtu < net->mtu) {
4653 							if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
4654 								sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4655 							}
4656 							net->mtu = mtu;
4657 						}
4658 					}
4659 				} else if (ifp) {
4660 					if (ND_IFINFO(ifp)->linkmtu &&
4661 					    (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4662 						sctp_mtu_size_reset(inp,
4663 						    &stcb->asoc,
4664 						    ND_IFINFO(ifp)->linkmtu);
4665 					}
4666 				}
4667 			}
4668 			return (ret);
4669 		}
4670 #endif
4671 	default:
4672 		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4673 		    ((struct sockaddr *)to)->sa_family);
4674 		sctp_m_freem(m);
4675 		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4676 		return (EFAULT);
4677 	}
4678 }
4679 
4680 
4681 void
4682 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4683 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4684     SCTP_UNUSED
4685 #endif
4686 )
4687 {
4688 	struct mbuf *m, *m_last;
4689 	struct sctp_nets *net;
4690 	struct sctp_init_chunk *init;
4691 	struct sctp_supported_addr_param *sup_addr;
4692 	struct sctp_adaptation_layer_indication *ali;
4693 	struct sctp_supported_chunk_types_param *pr_supported;
4694 	struct sctp_paramhdr *ph;
4695 	int cnt_inits_to = 0;
4696 	int error;
4697 	uint16_t num_ext, chunk_len, padding_len, parameter_len;
4698 
4699 	/* INIT's always go to the primary (and usually ONLY address) */
4700 	net = stcb->asoc.primary_destination;
4701 	if (net == NULL) {
4702 		net = TAILQ_FIRST(&stcb->asoc.nets);
4703 		if (net == NULL) {
4704 			/* TSNH */
4705 			return;
4706 		}
4707 		/* we confirm any address we send an INIT to */
4708 		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4709 		(void)sctp_set_primary_addr(stcb, NULL, net);
4710 	} else {
4711 		/* we confirm any address we send an INIT to */
4712 		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4713 	}
4714 	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4715 #ifdef INET6
4716 	if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4717 		/*
4718 		 * special hook, if we are sending to link local it will not
4719 		 * show up in our private address count.
4720 		 */
4721 		if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4722 			cnt_inits_to = 1;
4723 	}
4724 #endif
4725 	if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4726 		/* This case should not happen */
4727 		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4728 		return;
4729 	}
4730 	/* start the INIT timer */
4731 	sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4732 
4733 	m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4734 	if (m == NULL) {
4735 		/* No memory, INIT timer will re-attempt. */
4736 		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4737 		return;
4738 	}
4739 	chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4740 	padding_len = 0;
4741 	/* Now lets put the chunk header in place */
4742 	init = mtod(m, struct sctp_init_chunk *);
4743 	/* now the chunk header */
4744 	init->ch.chunk_type = SCTP_INITIATION;
4745 	init->ch.chunk_flags = 0;
4746 	/* fill in later from mbuf we build */
4747 	init->ch.chunk_length = 0;
4748 	/* place in my tag */
4749 	init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4750 	/* set up some of the credits. */
4751 	init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4752 	    SCTP_MINIMAL_RWND));
4753 	init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4754 	init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4755 	init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4756 
4757 	/* Adaptation layer indication parameter */
4758 	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4759 		parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4760 		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4761 		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4762 		ali->ph.param_length = htons(parameter_len);
4763 		ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4764 		chunk_len += parameter_len;
4765 	}
4766 
4767 	/* ECN parameter */
4768 	if (stcb->asoc.ecn_supported == 1) {
4769 		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4770 		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4771 		ph->param_type = htons(SCTP_ECN_CAPABLE);
4772 		ph->param_length = htons(parameter_len);
4773 		chunk_len += parameter_len;
4774 	}
4775 
4776 	/* PR-SCTP supported parameter */
4777 	if (stcb->asoc.prsctp_supported == 1) {
4778 		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4779 		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4780 		ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4781 		ph->param_length = htons(parameter_len);
4782 		chunk_len += parameter_len;
4783 	}
4784 
4785 	/* Add NAT friendly parameter. */
4786 	if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4787 		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4788 		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4789 		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4790 		ph->param_length = htons(parameter_len);
4791 		chunk_len += parameter_len;
4792 	}
4793 
4794 	/* And now tell the peer which extensions we support */
4795 	num_ext = 0;
4796 	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4797 	if (stcb->asoc.prsctp_supported == 1) {
4798 		pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4799 		if (stcb->asoc.idata_supported) {
4800 			pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4801 		}
4802 	}
4803 	if (stcb->asoc.auth_supported == 1) {
4804 		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4805 	}
4806 	if (stcb->asoc.asconf_supported == 1) {
4807 		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4808 		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4809 	}
4810 	if (stcb->asoc.reconfig_supported == 1) {
4811 		pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4812 	}
4813 	if (stcb->asoc.idata_supported) {
4814 		pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4815 	}
4816 	if (stcb->asoc.nrsack_supported == 1) {
4817 		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4818 	}
4819 	if (stcb->asoc.pktdrop_supported == 1) {
4820 		pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4821 	}
4822 	if (num_ext > 0) {
4823 		parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4824 		pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4825 		pr_supported->ph.param_length = htons(parameter_len);
4826 		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4827 		chunk_len += parameter_len;
4828 	}
4829 	/* add authentication parameters */
4830 	if (stcb->asoc.auth_supported) {
4831 		/* attach RANDOM parameter, if available */
4832 		if (stcb->asoc.authinfo.random != NULL) {
4833 			struct sctp_auth_random *randp;
4834 
4835 			if (padding_len > 0) {
4836 				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4837 				chunk_len += padding_len;
4838 				padding_len = 0;
4839 			}
4840 			randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4841 			parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4842 			/* random key already contains the header */
4843 			memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4844 			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4845 			chunk_len += parameter_len;
4846 		}
4847 		/* add HMAC_ALGO parameter */
4848 		if (stcb->asoc.local_hmacs != NULL) {
4849 			struct sctp_auth_hmac_algo *hmacs;
4850 
4851 			if (padding_len > 0) {
4852 				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4853 				chunk_len += padding_len;
4854 				padding_len = 0;
4855 			}
4856 			hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4857 			parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4858 			    stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4859 			hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4860 			hmacs->ph.param_length = htons(parameter_len);
4861 			sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4862 			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4863 			chunk_len += parameter_len;
4864 		}
4865 		/* add CHUNKS parameter */
4866 		if (stcb->asoc.local_auth_chunks != NULL) {
4867 			struct sctp_auth_chunk_list *chunks;
4868 
4869 			if (padding_len > 0) {
4870 				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4871 				chunk_len += padding_len;
4872 				padding_len = 0;
4873 			}
4874 			chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4875 			parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4876 			    sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4877 			chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4878 			chunks->ph.param_length = htons(parameter_len);
4879 			sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4880 			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4881 			chunk_len += parameter_len;
4882 		}
4883 	}
4884 
4885 	/* now any cookie time extensions */
4886 	if (stcb->asoc.cookie_preserve_req) {
4887 		struct sctp_cookie_perserve_param *cookie_preserve;
4888 
4889 		if (padding_len > 0) {
4890 			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4891 			chunk_len += padding_len;
4892 			padding_len = 0;
4893 		}
4894 		parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4895 		cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4896 		cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4897 		cookie_preserve->ph.param_length = htons(parameter_len);
4898 		cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4899 		stcb->asoc.cookie_preserve_req = 0;
4900 		chunk_len += parameter_len;
4901 	}
4902 
4903 	if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4904 		uint8_t i;
4905 
4906 		if (padding_len > 0) {
4907 			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4908 			chunk_len += padding_len;
4909 			padding_len = 0;
4910 		}
4911 		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4912 		if (stcb->asoc.scope.ipv4_addr_legal) {
4913 			parameter_len += (uint16_t)sizeof(uint16_t);
4914 		}
4915 		if (stcb->asoc.scope.ipv6_addr_legal) {
4916 			parameter_len += (uint16_t)sizeof(uint16_t);
4917 		}
4918 		sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4919 		sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4920 		sup_addr->ph.param_length = htons(parameter_len);
4921 		i = 0;
4922 		if (stcb->asoc.scope.ipv4_addr_legal) {
4923 			sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4924 		}
4925 		if (stcb->asoc.scope.ipv6_addr_legal) {
4926 			sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4927 		}
4928 		padding_len = 4 - 2 * i;
4929 		chunk_len += parameter_len;
4930 	}
4931 
4932 	SCTP_BUF_LEN(m) = chunk_len;
4933 	/* now the addresses */
4934 	/*
4935 	 * To optimize this we could put the scoping stuff into a structure
4936 	 * and remove the individual uint8's from the assoc structure. Then
4937 	 * we could just sifa in the address within the stcb. But for now
4938 	 * this is a quick hack to get the address stuff teased apart.
4939 	 */
4940 	m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4941 	    m, cnt_inits_to,
4942 	    &padding_len, &chunk_len);
4943 
4944 	init->ch.chunk_length = htons(chunk_len);
4945 	if (padding_len > 0) {
4946 		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4947 			sctp_m_freem(m);
4948 			return;
4949 		}
4950 	}
4951 	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4952 	if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4953 	    (struct sockaddr *)&net->ro._l_addr,
4954 	    m, 0, NULL, 0, 0, 0, 0,
4955 	    inp->sctp_lport, stcb->rport, htonl(0),
4956 	    net->port, NULL,
4957 	    0, 0,
4958 	    so_locked))) {
4959 		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4960 		if (error == ENOBUFS) {
4961 			stcb->asoc.ifp_had_enobuf = 1;
4962 			SCTP_STAT_INCR(sctps_lowlevelerr);
4963 		}
4964 	} else {
4965 		stcb->asoc.ifp_had_enobuf = 0;
4966 	}
4967 	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4968 	(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4969 }
4970 
4971 struct mbuf *
4972 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4973     int param_offset, int *abort_processing,
4974     struct sctp_chunkhdr *cp,
4975     int *nat_friendly,
4976     int *cookie_found)
4977 {
4978 	/*
4979 	 * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4980 	 * being equal to the beginning of the params i.e. (iphlen +
4981 	 * sizeof(struct sctp_init_msg) parse through the parameters to the
4982 	 * end of the mbuf verifying that all parameters are known.
4983 	 *
4984 	 * For unknown parameters build and return a mbuf with
4985 	 * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4986 	 * processing this chunk stop, and set *abort_processing to 1.
4987 	 *
4988 	 * By having param_offset be pre-set to where parameters begin it is
4989 	 * hoped that this routine may be reused in the future by new
4990 	 * features.
4991 	 */
4992 	struct sctp_paramhdr *phdr, params;
4993 
4994 	struct mbuf *mat, *m_tmp, *op_err, *op_err_last;
4995 	int at, limit, pad_needed;
4996 	uint16_t ptype, plen, padded_size;
4997 
4998 	*abort_processing = 0;
4999 	if (cookie_found != NULL) {
5000 		*cookie_found = 0;
5001 	}
5002 	mat = in_initpkt;
5003 	limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
5004 	at = param_offset;
5005 	op_err = NULL;
5006 	op_err_last = NULL;
5007 	pad_needed = 0;
5008 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
5009 	phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5010 	while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
5011 		ptype = ntohs(phdr->param_type);
5012 		plen = ntohs(phdr->param_length);
5013 		if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
5014 			/* wacked parameter */
5015 			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5016 			goto invalid_size;
5017 		}
5018 		limit -= SCTP_SIZE32(plen);
5019 		/*-
5020 		 * All parameters for all chunks that we know/understand are
5021 		 * listed here. We process them other places and make
5022 		 * appropriate stop actions per the upper bits. However this
5023 		 * is the generic routine processor's can call to get back
5024 		 * an operr.. to either incorporate (init-ack) or send.
5025 		 */
5026 		padded_size = SCTP_SIZE32(plen);
5027 		switch (ptype) {
5028 			/* Param's with variable size */
5029 		case SCTP_HEARTBEAT_INFO:
5030 		case SCTP_UNRECOG_PARAM:
5031 		case SCTP_ERROR_CAUSE_IND:
5032 			/* ok skip fwd */
5033 			at += padded_size;
5034 			break;
5035 		case SCTP_STATE_COOKIE:
5036 			if (cookie_found != NULL) {
5037 				*cookie_found = 1;
5038 			}
5039 			at += padded_size;
5040 			break;
5041 			/* Param's with variable size within a range */
5042 		case SCTP_CHUNK_LIST:
5043 		case SCTP_SUPPORTED_CHUNK_EXT:
5044 			if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5045 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5046 				goto invalid_size;
5047 			}
5048 			at += padded_size;
5049 			break;
5050 		case SCTP_SUPPORTED_ADDRTYPE:
5051 			if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5052 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5053 				goto invalid_size;
5054 			}
5055 			at += padded_size;
5056 			break;
5057 		case SCTP_RANDOM:
5058 			if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5059 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5060 				goto invalid_size;
5061 			}
5062 			at += padded_size;
5063 			break;
5064 		case SCTP_SET_PRIM_ADDR:
5065 		case SCTP_DEL_IP_ADDRESS:
5066 		case SCTP_ADD_IP_ADDRESS:
5067 			if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5068 			    (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5069 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5070 				goto invalid_size;
5071 			}
5072 			at += padded_size;
5073 			break;
5074 			/* Param's with a fixed size */
5075 		case SCTP_IPV4_ADDRESS:
5076 			if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5077 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5078 				goto invalid_size;
5079 			}
5080 			at += padded_size;
5081 			break;
5082 		case SCTP_IPV6_ADDRESS:
5083 			if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5084 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5085 				goto invalid_size;
5086 			}
5087 			at += padded_size;
5088 			break;
5089 		case SCTP_COOKIE_PRESERVE:
5090 			if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5091 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5092 				goto invalid_size;
5093 			}
5094 			at += padded_size;
5095 			break;
5096 		case SCTP_HAS_NAT_SUPPORT:
5097 			*nat_friendly = 1;
5098 			/* fall through */
5099 		case SCTP_PRSCTP_SUPPORTED:
5100 			if (padded_size != sizeof(struct sctp_paramhdr)) {
5101 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5102 				goto invalid_size;
5103 			}
5104 			at += padded_size;
5105 			break;
5106 		case SCTP_ECN_CAPABLE:
5107 			if (padded_size != sizeof(struct sctp_paramhdr)) {
5108 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5109 				goto invalid_size;
5110 			}
5111 			at += padded_size;
5112 			break;
5113 		case SCTP_ULP_ADAPTATION:
5114 			if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5115 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5116 				goto invalid_size;
5117 			}
5118 			at += padded_size;
5119 			break;
5120 		case SCTP_SUCCESS_REPORT:
5121 			if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5122 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5123 				goto invalid_size;
5124 			}
5125 			at += padded_size;
5126 			break;
5127 		case SCTP_HOSTNAME_ADDRESS:
5128 			{
5129 				/* Hostname parameters are deprecated. */
5130 				struct sctp_gen_error_cause *cause;
5131 				int l_len;
5132 
5133 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5134 				*abort_processing = 1;
5135 				sctp_m_freem(op_err);
5136 				op_err = NULL;
5137 				op_err_last = NULL;
5138 #ifdef INET6
5139 				l_len = SCTP_MIN_OVERHEAD;
5140 #else
5141 				l_len = SCTP_MIN_V4_OVERHEAD;
5142 #endif
5143 				l_len += sizeof(struct sctp_chunkhdr);
5144 				l_len += sizeof(struct sctp_gen_error_cause);
5145 				op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5146 				if (op_err != NULL) {
5147 					/*
5148 					 * Pre-reserve space for IP, SCTP,
5149 					 * and chunk header.
5150 					 */
5151 #ifdef INET6
5152 					SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5153 #else
5154 					SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5155 #endif
5156 					SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5157 					SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5158 					SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5159 					cause = mtod(op_err, struct sctp_gen_error_cause *);
5160 					cause->code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5161 					cause->length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
5162 					SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5163 					if (SCTP_BUF_NEXT(op_err) == NULL) {
5164 						sctp_m_freem(op_err);
5165 						op_err = NULL;
5166 						op_err_last = NULL;
5167 					}
5168 				}
5169 				return (op_err);
5170 				break;
5171 			}
5172 		default:
5173 			/*
5174 			 * we do not recognize the parameter figure out what
5175 			 * we do.
5176 			 */
5177 			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5178 			if ((ptype & 0x4000) == 0x4000) {
5179 				/* Report bit is set?? */
5180 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5181 				if (op_err == NULL) {
5182 					int l_len;
5183 
5184 					/* Ok need to try to get an mbuf */
5185 #ifdef INET6
5186 					l_len = SCTP_MIN_OVERHEAD;
5187 #else
5188 					l_len = SCTP_MIN_V4_OVERHEAD;
5189 #endif
5190 					l_len += sizeof(struct sctp_chunkhdr);
5191 					l_len += sizeof(struct sctp_paramhdr);
5192 					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5193 					if (op_err) {
5194 						SCTP_BUF_LEN(op_err) = 0;
5195 #ifdef INET6
5196 						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5197 #else
5198 						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5199 #endif
5200 						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5201 						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5202 						op_err_last = op_err;
5203 					}
5204 				}
5205 				if (op_err != NULL) {
5206 					/* If we have space */
5207 					struct sctp_paramhdr *param;
5208 
5209 					if (pad_needed > 0) {
5210 						op_err_last = sctp_add_pad_tombuf(op_err_last, pad_needed);
5211 					}
5212 					if (op_err_last == NULL) {
5213 						sctp_m_freem(op_err);
5214 						op_err = NULL;
5215 						op_err_last = NULL;
5216 						goto more_processing;
5217 					}
5218 					if (M_TRAILINGSPACE(op_err_last) < (int)sizeof(struct sctp_paramhdr)) {
5219 						m_tmp = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
5220 						if (m_tmp == NULL) {
5221 							sctp_m_freem(op_err);
5222 							op_err = NULL;
5223 							op_err_last = NULL;
5224 							goto more_processing;
5225 						}
5226 						SCTP_BUF_LEN(m_tmp) = 0;
5227 						SCTP_BUF_NEXT(m_tmp) = NULL;
5228 						SCTP_BUF_NEXT(op_err_last) = m_tmp;
5229 						op_err_last = m_tmp;
5230 					}
5231 					param = (struct sctp_paramhdr *)(mtod(op_err_last, caddr_t)+SCTP_BUF_LEN(op_err_last));
5232 					param->param_type = htons(SCTP_UNRECOG_PARAM);
5233 					param->param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
5234 					SCTP_BUF_LEN(op_err_last) += sizeof(struct sctp_paramhdr);
5235 					SCTP_BUF_NEXT(op_err_last) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
5236 					if (SCTP_BUF_NEXT(op_err_last) == NULL) {
5237 						sctp_m_freem(op_err);
5238 						op_err = NULL;
5239 						op_err_last = NULL;
5240 						goto more_processing;
5241 					} else {
5242 						while (SCTP_BUF_NEXT(op_err_last) != NULL) {
5243 							op_err_last = SCTP_BUF_NEXT(op_err_last);
5244 						}
5245 					}
5246 					if (plen % 4 != 0) {
5247 						pad_needed = 4 - (plen % 4);
5248 					} else {
5249 						pad_needed = 0;
5250 					}
5251 				}
5252 			}
5253 	more_processing:
5254 			if ((ptype & 0x8000) == 0x0000) {
5255 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5256 				return (op_err);
5257 			} else {
5258 				/* skip this chunk and continue processing */
5259 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5260 				at += SCTP_SIZE32(plen);
5261 			}
5262 			break;
5263 
5264 		}
5265 		phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5266 	}
5267 	return (op_err);
5268 invalid_size:
5269 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5270 	*abort_processing = 1;
5271 	sctp_m_freem(op_err);
5272 	op_err = NULL;
5273 	op_err_last = NULL;
5274 	if (phdr != NULL) {
5275 		struct sctp_paramhdr *param;
5276 		int l_len;
5277 #ifdef INET6
5278 		l_len = SCTP_MIN_OVERHEAD;
5279 #else
5280 		l_len = SCTP_MIN_V4_OVERHEAD;
5281 #endif
5282 		l_len += sizeof(struct sctp_chunkhdr);
5283 		l_len += (2 * sizeof(struct sctp_paramhdr));
5284 		op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5285 		if (op_err) {
5286 			SCTP_BUF_LEN(op_err) = 0;
5287 #ifdef INET6
5288 			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5289 #else
5290 			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5291 #endif
5292 			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5293 			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5294 			SCTP_BUF_LEN(op_err) = 2 * sizeof(struct sctp_paramhdr);
5295 			param = mtod(op_err, struct sctp_paramhdr *);
5296 			param->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5297 			param->param_length = htons(2 * sizeof(struct sctp_paramhdr));
5298 			param++;
5299 			param->param_type = htons(ptype);
5300 			param->param_length = htons(plen);
5301 		}
5302 	}
5303 	return (op_err);
5304 }
5305 
5306 static int
5307 sctp_are_there_new_addresses(struct sctp_association *asoc,
5308     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5309 {
5310 	/*
5311 	 * Given a INIT packet, look through the packet to verify that there
5312 	 * are NO new addresses. As we go through the parameters add reports
5313 	 * of any un-understood parameters that require an error.  Also we
5314 	 * must return (1) to drop the packet if we see a un-understood
5315 	 * parameter that tells us to drop the chunk.
5316 	 */
5317 	struct sockaddr *sa_touse;
5318 	struct sockaddr *sa;
5319 	struct sctp_paramhdr *phdr, params;
5320 	uint16_t ptype, plen;
5321 	uint8_t fnd;
5322 	struct sctp_nets *net;
5323 	int check_src;
5324 #ifdef INET
5325 	struct sockaddr_in sin4, *sa4;
5326 #endif
5327 #ifdef INET6
5328 	struct sockaddr_in6 sin6, *sa6;
5329 #endif
5330 
5331 #ifdef INET
5332 	memset(&sin4, 0, sizeof(sin4));
5333 	sin4.sin_family = AF_INET;
5334 	sin4.sin_len = sizeof(sin4);
5335 #endif
5336 #ifdef INET6
5337 	memset(&sin6, 0, sizeof(sin6));
5338 	sin6.sin6_family = AF_INET6;
5339 	sin6.sin6_len = sizeof(sin6);
5340 #endif
5341 	/* First what about the src address of the pkt ? */
5342 	check_src = 0;
5343 	switch (src->sa_family) {
5344 #ifdef INET
5345 	case AF_INET:
5346 		if (asoc->scope.ipv4_addr_legal) {
5347 			check_src = 1;
5348 		}
5349 		break;
5350 #endif
5351 #ifdef INET6
5352 	case AF_INET6:
5353 		if (asoc->scope.ipv6_addr_legal) {
5354 			check_src = 1;
5355 		}
5356 		break;
5357 #endif
5358 	default:
5359 		/* TSNH */
5360 		break;
5361 	}
5362 	if (check_src) {
5363 		fnd = 0;
5364 		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5365 			sa = (struct sockaddr *)&net->ro._l_addr;
5366 			if (sa->sa_family == src->sa_family) {
5367 #ifdef INET
5368 				if (sa->sa_family == AF_INET) {
5369 					struct sockaddr_in *src4;
5370 
5371 					sa4 = (struct sockaddr_in *)sa;
5372 					src4 = (struct sockaddr_in *)src;
5373 					if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5374 						fnd = 1;
5375 						break;
5376 					}
5377 				}
5378 #endif
5379 #ifdef INET6
5380 				if (sa->sa_family == AF_INET6) {
5381 					struct sockaddr_in6 *src6;
5382 
5383 					sa6 = (struct sockaddr_in6 *)sa;
5384 					src6 = (struct sockaddr_in6 *)src;
5385 					if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5386 						fnd = 1;
5387 						break;
5388 					}
5389 				}
5390 #endif
5391 			}
5392 		}
5393 		if (fnd == 0) {
5394 			/* New address added! no need to look further. */
5395 			return (1);
5396 		}
5397 	}
5398 	/* Ok so far lets munge through the rest of the packet */
5399 	offset += sizeof(struct sctp_init_chunk);
5400 	phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5401 	while (phdr) {
5402 		sa_touse = NULL;
5403 		ptype = ntohs(phdr->param_type);
5404 		plen = ntohs(phdr->param_length);
5405 		switch (ptype) {
5406 #ifdef INET
5407 		case SCTP_IPV4_ADDRESS:
5408 			{
5409 				struct sctp_ipv4addr_param *p4, p4_buf;
5410 
5411 				if (plen != sizeof(struct sctp_ipv4addr_param)) {
5412 					return (1);
5413 				}
5414 				phdr = sctp_get_next_param(in_initpkt, offset,
5415 				    (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5416 				if (phdr == NULL) {
5417 					return (1);
5418 				}
5419 				if (asoc->scope.ipv4_addr_legal) {
5420 					p4 = (struct sctp_ipv4addr_param *)phdr;
5421 					sin4.sin_addr.s_addr = p4->addr;
5422 					sa_touse = (struct sockaddr *)&sin4;
5423 				}
5424 				break;
5425 			}
5426 #endif
5427 #ifdef INET6
5428 		case SCTP_IPV6_ADDRESS:
5429 			{
5430 				struct sctp_ipv6addr_param *p6, p6_buf;
5431 
5432 				if (plen != sizeof(struct sctp_ipv6addr_param)) {
5433 					return (1);
5434 				}
5435 				phdr = sctp_get_next_param(in_initpkt, offset,
5436 				    (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5437 				if (phdr == NULL) {
5438 					return (1);
5439 				}
5440 				if (asoc->scope.ipv6_addr_legal) {
5441 					p6 = (struct sctp_ipv6addr_param *)phdr;
5442 					memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5443 					    sizeof(p6->addr));
5444 					sa_touse = (struct sockaddr *)&sin6;
5445 				}
5446 				break;
5447 			}
5448 #endif
5449 		default:
5450 			sa_touse = NULL;
5451 			break;
5452 		}
5453 		if (sa_touse) {
5454 			/* ok, sa_touse points to one to check */
5455 			fnd = 0;
5456 			TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5457 				sa = (struct sockaddr *)&net->ro._l_addr;
5458 				if (sa->sa_family != sa_touse->sa_family) {
5459 					continue;
5460 				}
5461 #ifdef INET
5462 				if (sa->sa_family == AF_INET) {
5463 					sa4 = (struct sockaddr_in *)sa;
5464 					if (sa4->sin_addr.s_addr ==
5465 					    sin4.sin_addr.s_addr) {
5466 						fnd = 1;
5467 						break;
5468 					}
5469 				}
5470 #endif
5471 #ifdef INET6
5472 				if (sa->sa_family == AF_INET6) {
5473 					sa6 = (struct sockaddr_in6 *)sa;
5474 					if (SCTP6_ARE_ADDR_EQUAL(
5475 					    sa6, &sin6)) {
5476 						fnd = 1;
5477 						break;
5478 					}
5479 				}
5480 #endif
5481 			}
5482 			if (!fnd) {
5483 				/* New addr added! no need to look further */
5484 				return (1);
5485 			}
5486 		}
5487 		offset += SCTP_SIZE32(plen);
5488 		phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5489 	}
5490 	return (0);
5491 }
5492 
5493 /*
5494  * Given a MBUF chain that was sent into us containing an INIT. Build a
5495  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5496  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5497  * message (i.e. the struct sctp_init_msg).
5498  */
5499 void
5500 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5501     struct sctp_nets *src_net, struct mbuf *init_pkt,
5502     int iphlen, int offset,
5503     struct sockaddr *src, struct sockaddr *dst,
5504     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5505     uint8_t mflowtype, uint32_t mflowid,
5506     uint32_t vrf_id, uint16_t port)
5507 {
5508 	struct sctp_association *asoc;
5509 	struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5510 	struct sctp_init_ack_chunk *initack;
5511 	struct sctp_adaptation_layer_indication *ali;
5512 	struct sctp_supported_chunk_types_param *pr_supported;
5513 	struct sctp_paramhdr *ph;
5514 	union sctp_sockstore *over_addr;
5515 	struct sctp_scoping scp;
5516 	struct timeval now;
5517 #ifdef INET
5518 	struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5519 	struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5520 	struct sockaddr_in *sin;
5521 #endif
5522 #ifdef INET6
5523 	struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5524 	struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5525 	struct sockaddr_in6 *sin6;
5526 #endif
5527 	struct sockaddr *to;
5528 	struct sctp_state_cookie stc;
5529 	struct sctp_nets *net = NULL;
5530 	uint8_t *signature = NULL;
5531 	int cnt_inits_to = 0;
5532 	uint16_t his_limit, i_want;
5533 	int abort_flag;
5534 	int nat_friendly = 0;
5535 	int error;
5536 	struct socket *so;
5537 	uint16_t num_ext, chunk_len, padding_len, parameter_len;
5538 
5539 	if (stcb) {
5540 		asoc = &stcb->asoc;
5541 	} else {
5542 		asoc = NULL;
5543 	}
5544 	if ((asoc != NULL) &&
5545 	    (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5546 		if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5547 			/*
5548 			 * new addresses, out of here in non-cookie-wait
5549 			 * states
5550 			 *
5551 			 * Send an ABORT, without the new address error
5552 			 * cause. This looks no different than if no
5553 			 * listener was present.
5554 			 */
5555 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5556 			    "Address added");
5557 			sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5558 			    mflowtype, mflowid, inp->fibnum,
5559 			    vrf_id, port);
5560 			return;
5561 		}
5562 		if (src_net != NULL && (src_net->port != port)) {
5563 			/*
5564 			 * change of remote encapsulation port, out of here
5565 			 * in non-cookie-wait states
5566 			 *
5567 			 * Send an ABORT, without an specific error cause.
5568 			 * This looks no different than if no listener was
5569 			 * present.
5570 			 */
5571 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5572 			    "Remote encapsulation port changed");
5573 			sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5574 			    mflowtype, mflowid, inp->fibnum,
5575 			    vrf_id, port);
5576 			return;
5577 		}
5578 	}
5579 	abort_flag = 0;
5580 	op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5581 	    (offset + sizeof(struct sctp_init_chunk)),
5582 	    &abort_flag,
5583 	    (struct sctp_chunkhdr *)init_chk,
5584 	    &nat_friendly, NULL);
5585 	if (abort_flag) {
5586 do_a_abort:
5587 		if (op_err == NULL) {
5588 			char msg[SCTP_DIAG_INFO_LEN];
5589 
5590 			snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5591 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5592 			    msg);
5593 		}
5594 		sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5595 		    init_chk->init.initiate_tag, op_err,
5596 		    mflowtype, mflowid, inp->fibnum,
5597 		    vrf_id, port);
5598 		return;
5599 	}
5600 	m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5601 	if (m == NULL) {
5602 		/* No memory, INIT timer will re-attempt. */
5603 		sctp_m_freem(op_err);
5604 		return;
5605 	}
5606 	chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5607 	padding_len = 0;
5608 
5609 	/*
5610 	 * We might not overwrite the identification[] completely and on
5611 	 * some platforms time_entered will contain some padding. Therefore
5612 	 * zero out the cookie to avoid putting uninitialized memory on the
5613 	 * wire.
5614 	 */
5615 	memset(&stc, 0, sizeof(struct sctp_state_cookie));
5616 
5617 	/* the time I built cookie */
5618 	(void)SCTP_GETTIME_TIMEVAL(&now);
5619 	stc.time_entered.tv_sec = now.tv_sec;
5620 	stc.time_entered.tv_usec = now.tv_usec;
5621 
5622 	/* populate any tie tags */
5623 	if (asoc != NULL) {
5624 		/* unlock before tag selections */
5625 		stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5626 		stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5627 		stc.cookie_life = asoc->cookie_life;
5628 		net = asoc->primary_destination;
5629 	} else {
5630 		stc.tie_tag_my_vtag = 0;
5631 		stc.tie_tag_peer_vtag = 0;
5632 		/* life I will award this cookie */
5633 		stc.cookie_life = inp->sctp_ep.def_cookie_life;
5634 	}
5635 
5636 	/* copy in the ports for later check */
5637 	stc.myport = sh->dest_port;
5638 	stc.peerport = sh->src_port;
5639 
5640 	/*
5641 	 * If we wanted to honor cookie life extensions, we would add to
5642 	 * stc.cookie_life. For now we should NOT honor any extension
5643 	 */
5644 	stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5645 	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5646 		stc.ipv6_addr_legal = 1;
5647 		if (SCTP_IPV6_V6ONLY(inp)) {
5648 			stc.ipv4_addr_legal = 0;
5649 		} else {
5650 			stc.ipv4_addr_legal = 1;
5651 		}
5652 	} else {
5653 		stc.ipv6_addr_legal = 0;
5654 		stc.ipv4_addr_legal = 1;
5655 	}
5656 	stc.ipv4_scope = 0;
5657 	if (net == NULL) {
5658 		to = src;
5659 		switch (dst->sa_family) {
5660 #ifdef INET
5661 		case AF_INET:
5662 			{
5663 				/* lookup address */
5664 				stc.address[0] = src4->sin_addr.s_addr;
5665 				stc.address[1] = 0;
5666 				stc.address[2] = 0;
5667 				stc.address[3] = 0;
5668 				stc.addr_type = SCTP_IPV4_ADDRESS;
5669 				/* local from address */
5670 				stc.laddress[0] = dst4->sin_addr.s_addr;
5671 				stc.laddress[1] = 0;
5672 				stc.laddress[2] = 0;
5673 				stc.laddress[3] = 0;
5674 				stc.laddr_type = SCTP_IPV4_ADDRESS;
5675 				/* scope_id is only for v6 */
5676 				stc.scope_id = 0;
5677 				if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5678 				    (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5679 					stc.ipv4_scope = 1;
5680 				}
5681 				/* Must use the address in this case */
5682 				if (sctp_is_address_on_local_host(src, vrf_id)) {
5683 					stc.loopback_scope = 1;
5684 					stc.ipv4_scope = 1;
5685 					stc.site_scope = 1;
5686 					stc.local_scope = 0;
5687 				}
5688 				break;
5689 			}
5690 #endif
5691 #ifdef INET6
5692 		case AF_INET6:
5693 			{
5694 				stc.addr_type = SCTP_IPV6_ADDRESS;
5695 				memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5696 				stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5697 				if (sctp_is_address_on_local_host(src, vrf_id)) {
5698 					stc.loopback_scope = 1;
5699 					stc.local_scope = 0;
5700 					stc.site_scope = 1;
5701 					stc.ipv4_scope = 1;
5702 				} else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5703 				    IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5704 					/*
5705 					 * If the new destination or source
5706 					 * is a LINK_LOCAL we must have
5707 					 * common both site and local scope.
5708 					 * Don't set local scope though
5709 					 * since we must depend on the
5710 					 * source to be added implicitly. We
5711 					 * cannot assure just because we
5712 					 * share one link that all links are
5713 					 * common.
5714 					 */
5715 					stc.local_scope = 0;
5716 					stc.site_scope = 1;
5717 					stc.ipv4_scope = 1;
5718 					/*
5719 					 * we start counting for the private
5720 					 * address stuff at 1. since the
5721 					 * link local we source from won't
5722 					 * show up in our scoped count.
5723 					 */
5724 					cnt_inits_to = 1;
5725 					/*
5726 					 * pull out the scope_id from
5727 					 * incoming pkt
5728 					 */
5729 				} else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5730 				    IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5731 					/*
5732 					 * If the new destination or source
5733 					 * is SITE_LOCAL then we must have
5734 					 * site scope in common.
5735 					 */
5736 					stc.site_scope = 1;
5737 				}
5738 				memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5739 				stc.laddr_type = SCTP_IPV6_ADDRESS;
5740 				break;
5741 			}
5742 #endif
5743 		default:
5744 			/* TSNH */
5745 			goto do_a_abort;
5746 			break;
5747 		}
5748 	} else {
5749 		/* set the scope per the existing tcb */
5750 
5751 #ifdef INET6
5752 		struct sctp_nets *lnet;
5753 #endif
5754 
5755 		stc.loopback_scope = asoc->scope.loopback_scope;
5756 		stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5757 		stc.site_scope = asoc->scope.site_scope;
5758 		stc.local_scope = asoc->scope.local_scope;
5759 #ifdef INET6
5760 		/* Why do we not consider IPv4 LL addresses? */
5761 		TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5762 			if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5763 				if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5764 					/*
5765 					 * if we have a LL address, start
5766 					 * counting at 1.
5767 					 */
5768 					cnt_inits_to = 1;
5769 				}
5770 			}
5771 		}
5772 #endif
5773 		/* use the net pointer */
5774 		to = (struct sockaddr *)&net->ro._l_addr;
5775 		switch (to->sa_family) {
5776 #ifdef INET
5777 		case AF_INET:
5778 			sin = (struct sockaddr_in *)to;
5779 			stc.address[0] = sin->sin_addr.s_addr;
5780 			stc.address[1] = 0;
5781 			stc.address[2] = 0;
5782 			stc.address[3] = 0;
5783 			stc.addr_type = SCTP_IPV4_ADDRESS;
5784 			if (net->src_addr_selected == 0) {
5785 				/*
5786 				 * strange case here, the INIT should have
5787 				 * did the selection.
5788 				 */
5789 				net->ro._s_addr = sctp_source_address_selection(inp,
5790 				    stcb, (sctp_route_t *)&net->ro,
5791 				    net, 0, vrf_id);
5792 				if (net->ro._s_addr == NULL) {
5793 					sctp_m_freem(op_err);
5794 					sctp_m_freem(m);
5795 					return;
5796 				}
5797 
5798 				net->src_addr_selected = 1;
5799 
5800 			}
5801 			stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5802 			stc.laddress[1] = 0;
5803 			stc.laddress[2] = 0;
5804 			stc.laddress[3] = 0;
5805 			stc.laddr_type = SCTP_IPV4_ADDRESS;
5806 			/* scope_id is only for v6 */
5807 			stc.scope_id = 0;
5808 			break;
5809 #endif
5810 #ifdef INET6
5811 		case AF_INET6:
5812 			sin6 = (struct sockaddr_in6 *)to;
5813 			memcpy(&stc.address, &sin6->sin6_addr,
5814 			    sizeof(struct in6_addr));
5815 			stc.addr_type = SCTP_IPV6_ADDRESS;
5816 			stc.scope_id = sin6->sin6_scope_id;
5817 			if (net->src_addr_selected == 0) {
5818 				/*
5819 				 * strange case here, the INIT should have
5820 				 * done the selection.
5821 				 */
5822 				net->ro._s_addr = sctp_source_address_selection(inp,
5823 				    stcb, (sctp_route_t *)&net->ro,
5824 				    net, 0, vrf_id);
5825 				if (net->ro._s_addr == NULL) {
5826 					sctp_m_freem(op_err);
5827 					sctp_m_freem(m);
5828 					return;
5829 				}
5830 
5831 				net->src_addr_selected = 1;
5832 			}
5833 			memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5834 			    sizeof(struct in6_addr));
5835 			stc.laddr_type = SCTP_IPV6_ADDRESS;
5836 			break;
5837 #endif
5838 		}
5839 	}
5840 	/* Now lets put the SCTP header in place */
5841 	initack = mtod(m, struct sctp_init_ack_chunk *);
5842 	/* Save it off for quick ref */
5843 	stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5844 	/* who are we */
5845 	memcpy(stc.identification, SCTP_VERSION_STRING,
5846 	    min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5847 	memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5848 	/* now the chunk header */
5849 	initack->ch.chunk_type = SCTP_INITIATION_ACK;
5850 	initack->ch.chunk_flags = 0;
5851 	/* fill in later from mbuf we build */
5852 	initack->ch.chunk_length = 0;
5853 	/* place in my tag */
5854 	if ((asoc != NULL) &&
5855 	    ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
5856 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
5857 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
5858 		/* re-use the v-tags and init-seq here */
5859 		initack->init.initiate_tag = htonl(asoc->my_vtag);
5860 		initack->init.initial_tsn = htonl(asoc->init_seq_number);
5861 	} else {
5862 		uint32_t vtag, itsn;
5863 
5864 		if (asoc) {
5865 			atomic_add_int(&asoc->refcnt, 1);
5866 			SCTP_TCB_UNLOCK(stcb);
5867 	new_tag:
5868 			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5869 			if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5870 				/*
5871 				 * Got a duplicate vtag on some guy behind a
5872 				 * nat make sure we don't use it.
5873 				 */
5874 				goto new_tag;
5875 			}
5876 			initack->init.initiate_tag = htonl(vtag);
5877 			/* get a TSN to use too */
5878 			itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5879 			initack->init.initial_tsn = htonl(itsn);
5880 			SCTP_TCB_LOCK(stcb);
5881 			atomic_add_int(&asoc->refcnt, -1);
5882 		} else {
5883 			SCTP_INP_INCR_REF(inp);
5884 			SCTP_INP_RUNLOCK(inp);
5885 			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5886 			initack->init.initiate_tag = htonl(vtag);
5887 			/* get a TSN to use too */
5888 			initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5889 			SCTP_INP_RLOCK(inp);
5890 			SCTP_INP_DECR_REF(inp);
5891 		}
5892 	}
5893 	/* save away my tag to */
5894 	stc.my_vtag = initack->init.initiate_tag;
5895 
5896 	/* set up some of the credits. */
5897 	so = inp->sctp_socket;
5898 	if (so == NULL) {
5899 		/* memory problem */
5900 		sctp_m_freem(op_err);
5901 		sctp_m_freem(m);
5902 		return;
5903 	} else {
5904 		initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5905 	}
5906 	/* set what I want */
5907 	his_limit = ntohs(init_chk->init.num_inbound_streams);
5908 	/* choose what I want */
5909 	if (asoc != NULL) {
5910 		if (asoc->streamoutcnt > asoc->pre_open_streams) {
5911 			i_want = asoc->streamoutcnt;
5912 		} else {
5913 			i_want = asoc->pre_open_streams;
5914 		}
5915 	} else {
5916 		i_want = inp->sctp_ep.pre_open_stream_count;
5917 	}
5918 	if (his_limit < i_want) {
5919 		/* I Want more :< */
5920 		initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5921 	} else {
5922 		/* I can have what I want :> */
5923 		initack->init.num_outbound_streams = htons(i_want);
5924 	}
5925 	/* tell him his limit. */
5926 	initack->init.num_inbound_streams =
5927 	    htons(inp->sctp_ep.max_open_streams_intome);
5928 
5929 	/* adaptation layer indication parameter */
5930 	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5931 		parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5932 		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5933 		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5934 		ali->ph.param_length = htons(parameter_len);
5935 		ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5936 		chunk_len += parameter_len;
5937 	}
5938 
5939 	/* ECN parameter */
5940 	if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5941 	    ((asoc == NULL) && (inp->ecn_supported == 1))) {
5942 		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5943 		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5944 		ph->param_type = htons(SCTP_ECN_CAPABLE);
5945 		ph->param_length = htons(parameter_len);
5946 		chunk_len += parameter_len;
5947 	}
5948 
5949 	/* PR-SCTP supported parameter */
5950 	if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5951 	    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5952 		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5953 		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5954 		ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5955 		ph->param_length = htons(parameter_len);
5956 		chunk_len += parameter_len;
5957 	}
5958 
5959 	/* Add NAT friendly parameter */
5960 	if (nat_friendly) {
5961 		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5962 		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5963 		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5964 		ph->param_length = htons(parameter_len);
5965 		chunk_len += parameter_len;
5966 	}
5967 
5968 	/* And now tell the peer which extensions we support */
5969 	num_ext = 0;
5970 	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5971 	if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5972 	    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5973 		pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5974 		if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5975 		    ((asoc == NULL) && (inp->idata_supported == 1))) {
5976 			pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5977 		}
5978 	}
5979 	if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5980 	    ((asoc == NULL) && (inp->auth_supported == 1))) {
5981 		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5982 	}
5983 	if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5984 	    ((asoc == NULL) && (inp->asconf_supported == 1))) {
5985 		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5986 		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5987 	}
5988 	if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5989 	    ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5990 		pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5991 	}
5992 	if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5993 	    ((asoc == NULL) && (inp->idata_supported == 1))) {
5994 		pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5995 	}
5996 	if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5997 	    ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5998 		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5999 	}
6000 	if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
6001 	    ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
6002 		pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
6003 	}
6004 	if (num_ext > 0) {
6005 		parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
6006 		pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
6007 		pr_supported->ph.param_length = htons(parameter_len);
6008 		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6009 		chunk_len += parameter_len;
6010 	}
6011 
6012 	/* add authentication parameters */
6013 	if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
6014 	    ((asoc == NULL) && (inp->auth_supported == 1))) {
6015 		struct sctp_auth_random *randp;
6016 		struct sctp_auth_hmac_algo *hmacs;
6017 		struct sctp_auth_chunk_list *chunks;
6018 
6019 		if (padding_len > 0) {
6020 			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6021 			chunk_len += padding_len;
6022 			padding_len = 0;
6023 		}
6024 		/* generate and add RANDOM parameter */
6025 		randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
6026 		parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
6027 		    SCTP_AUTH_RANDOM_SIZE_DEFAULT;
6028 		randp->ph.param_type = htons(SCTP_RANDOM);
6029 		randp->ph.param_length = htons(parameter_len);
6030 		SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
6031 		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6032 		chunk_len += parameter_len;
6033 
6034 		if (padding_len > 0) {
6035 			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6036 			chunk_len += padding_len;
6037 			padding_len = 0;
6038 		}
6039 		/* add HMAC_ALGO parameter */
6040 		hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6041 		parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6042 		    sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6043 		    (uint8_t *)hmacs->hmac_ids);
6044 		hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6045 		hmacs->ph.param_length = htons(parameter_len);
6046 		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6047 		chunk_len += parameter_len;
6048 
6049 		if (padding_len > 0) {
6050 			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6051 			chunk_len += padding_len;
6052 			padding_len = 0;
6053 		}
6054 		/* add CHUNKS parameter */
6055 		chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6056 		parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6057 		    sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6058 		    chunks->chunk_types);
6059 		chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6060 		chunks->ph.param_length = htons(parameter_len);
6061 		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6062 		chunk_len += parameter_len;
6063 	}
6064 	SCTP_BUF_LEN(m) = chunk_len;
6065 	m_last = m;
6066 	/* now the addresses */
6067 	/*
6068 	 * To optimize this we could put the scoping stuff into a structure
6069 	 * and remove the individual uint8's from the stc structure. Then we
6070 	 * could just sifa in the address within the stc.. but for now this
6071 	 * is a quick hack to get the address stuff teased apart.
6072 	 */
6073 	scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6074 	scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6075 	scp.loopback_scope = stc.loopback_scope;
6076 	scp.ipv4_local_scope = stc.ipv4_scope;
6077 	scp.local_scope = stc.local_scope;
6078 	scp.site_scope = stc.site_scope;
6079 	m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6080 	    cnt_inits_to,
6081 	    &padding_len, &chunk_len);
6082 	/* padding_len can only be positive, if no addresses have been added */
6083 	if (padding_len > 0) {
6084 		memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6085 		chunk_len += padding_len;
6086 		SCTP_BUF_LEN(m) += padding_len;
6087 		padding_len = 0;
6088 	}
6089 
6090 	/* tack on the operational error if present */
6091 	if (op_err) {
6092 		parameter_len = 0;
6093 		for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6094 			parameter_len += SCTP_BUF_LEN(m_tmp);
6095 		}
6096 		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6097 		SCTP_BUF_NEXT(m_last) = op_err;
6098 		while (SCTP_BUF_NEXT(m_last) != NULL) {
6099 			m_last = SCTP_BUF_NEXT(m_last);
6100 		}
6101 		chunk_len += parameter_len;
6102 	}
6103 	if (padding_len > 0) {
6104 		m_last = sctp_add_pad_tombuf(m_last, padding_len);
6105 		if (m_last == NULL) {
6106 			/* Houston we have a problem, no space */
6107 			sctp_m_freem(m);
6108 			return;
6109 		}
6110 		chunk_len += padding_len;
6111 		padding_len = 0;
6112 	}
6113 	/* Now we must build a cookie */
6114 	m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6115 	if (m_cookie == NULL) {
6116 		/* memory problem */
6117 		sctp_m_freem(m);
6118 		return;
6119 	}
6120 	/* Now append the cookie to the end and update the space/size */
6121 	SCTP_BUF_NEXT(m_last) = m_cookie;
6122 	parameter_len = 0;
6123 	for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6124 		parameter_len += SCTP_BUF_LEN(m_tmp);
6125 		if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6126 			m_last = m_tmp;
6127 		}
6128 	}
6129 	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6130 	chunk_len += parameter_len;
6131 
6132 	/*
6133 	 * Place in the size, but we don't include the last pad (if any) in
6134 	 * the INIT-ACK.
6135 	 */
6136 	initack->ch.chunk_length = htons(chunk_len);
6137 
6138 	/*
6139 	 * Time to sign the cookie, we don't sign over the cookie signature
6140 	 * though thus we set trailer.
6141 	 */
6142 	(void)sctp_hmac_m(SCTP_HMAC,
6143 	    (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6144 	    SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6145 	    (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6146 	/*
6147 	 * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6148 	 * here since the timer will drive a retranmission.
6149 	 */
6150 	if (padding_len > 0) {
6151 		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6152 			sctp_m_freem(m);
6153 			return;
6154 		}
6155 	}
6156 	if (stc.loopback_scope) {
6157 		over_addr = (union sctp_sockstore *)dst;
6158 	} else {
6159 		over_addr = NULL;
6160 	}
6161 
6162 	if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6163 	    0, 0,
6164 	    inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6165 	    port, over_addr,
6166 	    mflowtype, mflowid,
6167 	    SCTP_SO_NOT_LOCKED))) {
6168 		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6169 		if (error == ENOBUFS) {
6170 			if (asoc != NULL) {
6171 				asoc->ifp_had_enobuf = 1;
6172 			}
6173 			SCTP_STAT_INCR(sctps_lowlevelerr);
6174 		}
6175 	} else {
6176 		if (asoc != NULL) {
6177 			asoc->ifp_had_enobuf = 0;
6178 		}
6179 	}
6180 	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6181 }
6182 
6183 
6184 static void
6185 sctp_prune_prsctp(struct sctp_tcb *stcb,
6186     struct sctp_association *asoc,
6187     struct sctp_sndrcvinfo *srcv,
6188     int dataout)
6189 {
6190 	int freed_spc = 0;
6191 	struct sctp_tmit_chunk *chk, *nchk;
6192 
6193 	SCTP_TCB_LOCK_ASSERT(stcb);
6194 	if ((asoc->prsctp_supported) &&
6195 	    (asoc->sent_queue_cnt_removeable > 0)) {
6196 		TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6197 			/*
6198 			 * Look for chunks marked with the PR_SCTP flag AND
6199 			 * the buffer space flag. If the one being sent is
6200 			 * equal or greater priority then purge the old one
6201 			 * and free some space.
6202 			 */
6203 			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6204 				/*
6205 				 * This one is PR-SCTP AND buffer space
6206 				 * limited type
6207 				 */
6208 				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6209 					/*
6210 					 * Lower numbers equates to higher
6211 					 * priority so if the one we are
6212 					 * looking at has a larger or equal
6213 					 * priority we want to drop the data
6214 					 * and NOT retransmit it.
6215 					 */
6216 					if (chk->data) {
6217 						/*
6218 						 * We release the book_size
6219 						 * if the mbuf is here
6220 						 */
6221 						int ret_spc;
6222 						uint8_t sent;
6223 
6224 						if (chk->sent > SCTP_DATAGRAM_UNSENT)
6225 							sent = 1;
6226 						else
6227 							sent = 0;
6228 						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6229 						    sent,
6230 						    SCTP_SO_LOCKED);
6231 						freed_spc += ret_spc;
6232 						if (freed_spc >= dataout) {
6233 							return;
6234 						}
6235 					}	/* if chunk was present */
6236 				}	/* if of sufficient priority */
6237 			}	/* if chunk has enabled */
6238 		}		/* tailqforeach */
6239 
6240 		TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6241 			/* Here we must move to the sent queue and mark */
6242 			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6243 				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6244 					if (chk->data) {
6245 						/*
6246 						 * We release the book_size
6247 						 * if the mbuf is here
6248 						 */
6249 						int ret_spc;
6250 
6251 						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6252 						    0, SCTP_SO_LOCKED);
6253 
6254 						freed_spc += ret_spc;
6255 						if (freed_spc >= dataout) {
6256 							return;
6257 						}
6258 					}	/* end if chk->data */
6259 				}	/* end if right class */
6260 			}	/* end if chk pr-sctp */
6261 		}		/* tailqforeachsafe (chk) */
6262 	}			/* if enabled in asoc */
6263 }
6264 
6265 int
6266 sctp_get_frag_point(struct sctp_tcb *stcb,
6267     struct sctp_association *asoc)
6268 {
6269 	int siz, ovh;
6270 
6271 	/*
6272 	 * For endpoints that have both v6 and v4 addresses we must reserve
6273 	 * room for the ipv6 header, for those that are only dealing with V4
6274 	 * we use a larger frag point.
6275 	 */
6276 	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6277 		ovh = SCTP_MIN_OVERHEAD;
6278 	} else {
6279 		ovh = SCTP_MIN_V4_OVERHEAD;
6280 	}
6281 	ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
6282 	if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6283 		siz = asoc->smallest_mtu - ovh;
6284 	else
6285 		siz = (stcb->asoc.sctp_frag_point - ovh);
6286 	/*
6287 	 * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6288 	 */
6289 	/* A data chunk MUST fit in a cluster */
6290 	/* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6291 	/* } */
6292 
6293 	/* adjust for an AUTH chunk if DATA requires auth */
6294 	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6295 		siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6296 
6297 	if (siz % 4) {
6298 		/* make it an even word boundary please */
6299 		siz -= (siz % 4);
6300 	}
6301 	return (siz);
6302 }
6303 
6304 static void
6305 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6306 {
6307 	/*
6308 	 * We assume that the user wants PR_SCTP_TTL if the user provides a
6309 	 * positive lifetime but does not specify any PR_SCTP policy.
6310 	 */
6311 	if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6312 		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6313 	} else if (sp->timetolive > 0) {
6314 		sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6315 		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6316 	} else {
6317 		return;
6318 	}
6319 	switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6320 	case CHUNK_FLAGS_PR_SCTP_BUF:
6321 		/*
6322 		 * Time to live is a priority stored in tv_sec when doing
6323 		 * the buffer drop thing.
6324 		 */
6325 		sp->ts.tv_sec = sp->timetolive;
6326 		sp->ts.tv_usec = 0;
6327 		break;
6328 	case CHUNK_FLAGS_PR_SCTP_TTL:
6329 		{
6330 			struct timeval tv;
6331 
6332 			(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6333 			tv.tv_sec = sp->timetolive / 1000;
6334 			tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6335 			/*
6336 			 * TODO sctp_constants.h needs alternative time
6337 			 * macros when _KERNEL is undefined.
6338 			 */
6339 			timevaladd(&sp->ts, &tv);
6340 		}
6341 		break;
6342 	case CHUNK_FLAGS_PR_SCTP_RTX:
6343 		/*
6344 		 * Time to live is a the number or retransmissions stored in
6345 		 * tv_sec.
6346 		 */
6347 		sp->ts.tv_sec = sp->timetolive;
6348 		sp->ts.tv_usec = 0;
6349 		break;
6350 	default:
6351 		SCTPDBG(SCTP_DEBUG_USRREQ1,
6352 		    "Unknown PR_SCTP policy %u.\n",
6353 		    PR_SCTP_POLICY(sp->sinfo_flags));
6354 		break;
6355 	}
6356 }
6357 
6358 static int
6359 sctp_msg_append(struct sctp_tcb *stcb,
6360     struct sctp_nets *net,
6361     struct mbuf *m,
6362     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6363 {
6364 	int error = 0;
6365 	struct mbuf *at;
6366 	struct sctp_stream_queue_pending *sp = NULL;
6367 	struct sctp_stream_out *strm;
6368 
6369 	/*
6370 	 * Given an mbuf chain, put it into the association send queue and
6371 	 * place it on the wheel
6372 	 */
6373 	if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6374 		/* Invalid stream number */
6375 		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6376 		error = EINVAL;
6377 		goto out_now;
6378 	}
6379 	if ((stcb->asoc.stream_locked) &&
6380 	    (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6381 		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6382 		error = EINVAL;
6383 		goto out_now;
6384 	}
6385 	strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6386 	/* Now can we send this? */
6387 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
6388 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6389 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6390 	    (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6391 		/* got data while shutting down */
6392 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6393 		error = ECONNRESET;
6394 		goto out_now;
6395 	}
6396 	sctp_alloc_a_strmoq(stcb, sp);
6397 	if (sp == NULL) {
6398 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6399 		error = ENOMEM;
6400 		goto out_now;
6401 	}
6402 	sp->sinfo_flags = srcv->sinfo_flags;
6403 	sp->timetolive = srcv->sinfo_timetolive;
6404 	sp->ppid = srcv->sinfo_ppid;
6405 	sp->context = srcv->sinfo_context;
6406 	sp->fsn = 0;
6407 	if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6408 		sp->net = net;
6409 		atomic_add_int(&sp->net->ref_count, 1);
6410 	} else {
6411 		sp->net = NULL;
6412 	}
6413 	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6414 	sp->sid = srcv->sinfo_stream;
6415 	sp->msg_is_complete = 1;
6416 	sp->sender_all_done = 1;
6417 	sp->some_taken = 0;
6418 	sp->data = m;
6419 	sp->tail_mbuf = NULL;
6420 	sctp_set_prsctp_policy(sp);
6421 	/*
6422 	 * We could in theory (for sendall) sifa the length in, but we would
6423 	 * still have to hunt through the chain since we need to setup the
6424 	 * tail_mbuf
6425 	 */
6426 	sp->length = 0;
6427 	for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6428 		if (SCTP_BUF_NEXT(at) == NULL)
6429 			sp->tail_mbuf = at;
6430 		sp->length += SCTP_BUF_LEN(at);
6431 	}
6432 	if (srcv->sinfo_keynumber_valid) {
6433 		sp->auth_keyid = srcv->sinfo_keynumber;
6434 	} else {
6435 		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6436 	}
6437 	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6438 		sctp_auth_key_acquire(stcb, sp->auth_keyid);
6439 		sp->holds_key_ref = 1;
6440 	}
6441 	if (hold_stcb_lock == 0) {
6442 		SCTP_TCB_SEND_LOCK(stcb);
6443 	}
6444 	sctp_snd_sb_alloc(stcb, sp->length);
6445 	atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6446 	TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6447 	stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6448 	m = NULL;
6449 	if (hold_stcb_lock == 0) {
6450 		SCTP_TCB_SEND_UNLOCK(stcb);
6451 	}
6452 out_now:
6453 	if (m) {
6454 		sctp_m_freem(m);
6455 	}
6456 	return (error);
6457 }
6458 
6459 
6460 static struct mbuf *
6461 sctp_copy_mbufchain(struct mbuf *clonechain,
6462     struct mbuf *outchain,
6463     struct mbuf **endofchain,
6464     int can_take_mbuf,
6465     int sizeofcpy,
6466     uint8_t copy_by_ref)
6467 {
6468 	struct mbuf *m;
6469 	struct mbuf *appendchain;
6470 	caddr_t cp;
6471 	int len;
6472 
6473 	if (endofchain == NULL) {
6474 		/* error */
6475 error_out:
6476 		if (outchain)
6477 			sctp_m_freem(outchain);
6478 		return (NULL);
6479 	}
6480 	if (can_take_mbuf) {
6481 		appendchain = clonechain;
6482 	} else {
6483 		if (!copy_by_ref &&
6484 		    (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6485 		    ) {
6486 			/* Its not in a cluster */
6487 			if (*endofchain == NULL) {
6488 				/* lets get a mbuf cluster */
6489 				if (outchain == NULL) {
6490 					/* This is the general case */
6491 			new_mbuf:
6492 					outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6493 					if (outchain == NULL) {
6494 						goto error_out;
6495 					}
6496 					SCTP_BUF_LEN(outchain) = 0;
6497 					*endofchain = outchain;
6498 					/* get the prepend space */
6499 					SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6500 				} else {
6501 					/*
6502 					 * We really should not get a NULL
6503 					 * in endofchain
6504 					 */
6505 					/* find end */
6506 					m = outchain;
6507 					while (m) {
6508 						if (SCTP_BUF_NEXT(m) == NULL) {
6509 							*endofchain = m;
6510 							break;
6511 						}
6512 						m = SCTP_BUF_NEXT(m);
6513 					}
6514 					/* sanity */
6515 					if (*endofchain == NULL) {
6516 						/*
6517 						 * huh, TSNH XXX maybe we
6518 						 * should panic
6519 						 */
6520 						sctp_m_freem(outchain);
6521 						goto new_mbuf;
6522 					}
6523 				}
6524 				/* get the new end of length */
6525 				len = (int)M_TRAILINGSPACE(*endofchain);
6526 			} else {
6527 				/* how much is left at the end? */
6528 				len = (int)M_TRAILINGSPACE(*endofchain);
6529 			}
6530 			/* Find the end of the data, for appending */
6531 			cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6532 
6533 			/* Now lets copy it out */
6534 			if (len >= sizeofcpy) {
6535 				/* It all fits, copy it in */
6536 				m_copydata(clonechain, 0, sizeofcpy, cp);
6537 				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6538 			} else {
6539 				/* fill up the end of the chain */
6540 				if (len > 0) {
6541 					m_copydata(clonechain, 0, len, cp);
6542 					SCTP_BUF_LEN((*endofchain)) += len;
6543 					/* now we need another one */
6544 					sizeofcpy -= len;
6545 				}
6546 				m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6547 				if (m == NULL) {
6548 					/* We failed */
6549 					goto error_out;
6550 				}
6551 				SCTP_BUF_NEXT((*endofchain)) = m;
6552 				*endofchain = m;
6553 				cp = mtod((*endofchain), caddr_t);
6554 				m_copydata(clonechain, len, sizeofcpy, cp);
6555 				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6556 			}
6557 			return (outchain);
6558 		} else {
6559 			/* copy the old fashion way */
6560 			appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6561 #ifdef SCTP_MBUF_LOGGING
6562 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6563 				sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6564 			}
6565 #endif
6566 		}
6567 	}
6568 	if (appendchain == NULL) {
6569 		/* error */
6570 		if (outchain)
6571 			sctp_m_freem(outchain);
6572 		return (NULL);
6573 	}
6574 	if (outchain) {
6575 		/* tack on to the end */
6576 		if (*endofchain != NULL) {
6577 			SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6578 		} else {
6579 			m = outchain;
6580 			while (m) {
6581 				if (SCTP_BUF_NEXT(m) == NULL) {
6582 					SCTP_BUF_NEXT(m) = appendchain;
6583 					break;
6584 				}
6585 				m = SCTP_BUF_NEXT(m);
6586 			}
6587 		}
6588 		/*
6589 		 * save off the end and update the end-chain position
6590 		 */
6591 		m = appendchain;
6592 		while (m) {
6593 			if (SCTP_BUF_NEXT(m) == NULL) {
6594 				*endofchain = m;
6595 				break;
6596 			}
6597 			m = SCTP_BUF_NEXT(m);
6598 		}
6599 		return (outchain);
6600 	} else {
6601 		/* save off the end and update the end-chain position */
6602 		m = appendchain;
6603 		while (m) {
6604 			if (SCTP_BUF_NEXT(m) == NULL) {
6605 				*endofchain = m;
6606 				break;
6607 			}
6608 			m = SCTP_BUF_NEXT(m);
6609 		}
6610 		return (appendchain);
6611 	}
6612 }
6613 
6614 static int
6615 sctp_med_chunk_output(struct sctp_inpcb *inp,
6616     struct sctp_tcb *stcb,
6617     struct sctp_association *asoc,
6618     int *num_out,
6619     int *reason_code,
6620     int control_only, int from_where,
6621     struct timeval *now, int *now_filled, int frag_point, int so_locked
6622 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6623     SCTP_UNUSED
6624 #endif
6625 );
6626 
6627 static void
6628 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6629     uint32_t val SCTP_UNUSED)
6630 {
6631 	struct sctp_copy_all *ca;
6632 	struct mbuf *m;
6633 	int ret = 0;
6634 	int added_control = 0;
6635 	int un_sent, do_chunk_output = 1;
6636 	struct sctp_association *asoc;
6637 	struct sctp_nets *net;
6638 
6639 	ca = (struct sctp_copy_all *)ptr;
6640 	if (ca->m == NULL) {
6641 		return;
6642 	}
6643 	if (ca->inp != inp) {
6644 		/* TSNH */
6645 		return;
6646 	}
6647 	if (ca->sndlen > 0) {
6648 		m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6649 		if (m == NULL) {
6650 			/* can't copy so we are done */
6651 			ca->cnt_failed++;
6652 			return;
6653 		}
6654 #ifdef SCTP_MBUF_LOGGING
6655 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6656 			sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6657 		}
6658 #endif
6659 	} else {
6660 		m = NULL;
6661 	}
6662 	SCTP_TCB_LOCK_ASSERT(stcb);
6663 	if (stcb->asoc.alternate) {
6664 		net = stcb->asoc.alternate;
6665 	} else {
6666 		net = stcb->asoc.primary_destination;
6667 	}
6668 	if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6669 		/* Abort this assoc with m as the user defined reason */
6670 		if (m != NULL) {
6671 			SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6672 		} else {
6673 			m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6674 			    0, M_NOWAIT, 1, MT_DATA);
6675 			SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6676 		}
6677 		if (m != NULL) {
6678 			struct sctp_paramhdr *ph;
6679 
6680 			ph = mtod(m, struct sctp_paramhdr *);
6681 			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6682 			ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6683 		}
6684 		/*
6685 		 * We add one here to keep the assoc from dis-appearing on
6686 		 * us.
6687 		 */
6688 		atomic_add_int(&stcb->asoc.refcnt, 1);
6689 		sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6690 		/*
6691 		 * sctp_abort_an_association calls sctp_free_asoc() free
6692 		 * association will NOT free it since we incremented the
6693 		 * refcnt .. we do this to prevent it being freed and things
6694 		 * getting tricky since we could end up (from free_asoc)
6695 		 * calling inpcb_free which would get a recursive lock call
6696 		 * to the iterator lock.. But as a consequence of that the
6697 		 * stcb will return to us un-locked.. since free_asoc
6698 		 * returns with either no TCB or the TCB unlocked, we must
6699 		 * relock.. to unlock in the iterator timer :-0
6700 		 */
6701 		SCTP_TCB_LOCK(stcb);
6702 		atomic_add_int(&stcb->asoc.refcnt, -1);
6703 		goto no_chunk_output;
6704 	} else {
6705 		if (m) {
6706 			ret = sctp_msg_append(stcb, net, m,
6707 			    &ca->sndrcv, 1);
6708 		}
6709 		asoc = &stcb->asoc;
6710 		if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6711 			/* shutdown this assoc */
6712 			if (TAILQ_EMPTY(&asoc->send_queue) &&
6713 			    TAILQ_EMPTY(&asoc->sent_queue) &&
6714 			    sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6715 				if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6716 					goto abort_anyway;
6717 				}
6718 				/*
6719 				 * there is nothing queued to send, so I'm
6720 				 * done...
6721 				 */
6722 				if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6723 				    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6724 				    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6725 					/*
6726 					 * only send SHUTDOWN the first time
6727 					 * through
6728 					 */
6729 					if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
6730 						SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6731 					}
6732 					SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
6733 					sctp_stop_timers_for_shutdown(stcb);
6734 					sctp_send_shutdown(stcb, net);
6735 					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6736 					    net);
6737 					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6738 					    asoc->primary_destination);
6739 					added_control = 1;
6740 					do_chunk_output = 0;
6741 				}
6742 			} else {
6743 				/*
6744 				 * we still got (or just got) data to send,
6745 				 * so set SHUTDOWN_PENDING
6746 				 */
6747 				/*
6748 				 * XXX sockets draft says that SCTP_EOF
6749 				 * should be sent with no data.  currently,
6750 				 * we will allow user data to be sent first
6751 				 * and move to SHUTDOWN-PENDING
6752 				 */
6753 				if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
6754 				    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6755 				    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6756 					if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6757 						SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
6758 					}
6759 					SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
6760 					if (TAILQ_EMPTY(&asoc->send_queue) &&
6761 					    TAILQ_EMPTY(&asoc->sent_queue) &&
6762 					    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6763 						struct mbuf *op_err;
6764 						char msg[SCTP_DIAG_INFO_LEN];
6765 
6766 				abort_anyway:
6767 						snprintf(msg, sizeof(msg),
6768 						    "%s:%d at %s", __FILE__, __LINE__, __func__);
6769 						op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6770 						    msg);
6771 						atomic_add_int(&stcb->asoc.refcnt, 1);
6772 						sctp_abort_an_association(stcb->sctp_ep, stcb,
6773 						    op_err, SCTP_SO_NOT_LOCKED);
6774 						atomic_add_int(&stcb->asoc.refcnt, -1);
6775 						goto no_chunk_output;
6776 					}
6777 					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6778 					    asoc->primary_destination);
6779 				}
6780 			}
6781 
6782 		}
6783 	}
6784 	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6785 	    (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
6786 
6787 	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6788 	    (stcb->asoc.total_flight > 0) &&
6789 	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6790 		do_chunk_output = 0;
6791 	}
6792 	if (do_chunk_output)
6793 		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6794 	else if (added_control) {
6795 		int num_out, reason, now_filled = 0;
6796 		struct timeval now;
6797 		int frag_point;
6798 
6799 		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6800 		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6801 		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6802 	}
6803 no_chunk_output:
6804 	if (ret) {
6805 		ca->cnt_failed++;
6806 	} else {
6807 		ca->cnt_sent++;
6808 	}
6809 }
6810 
6811 static void
6812 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6813 {
6814 	struct sctp_copy_all *ca;
6815 
6816 	ca = (struct sctp_copy_all *)ptr;
6817 	/*
6818 	 * Do a notify here? Kacheong suggests that the notify be done at
6819 	 * the send time.. so you would push up a notification if any send
6820 	 * failed. Don't know if this is feasible since the only failures we
6821 	 * have is "memory" related and if you cannot get an mbuf to send
6822 	 * the data you surely can't get an mbuf to send up to notify the
6823 	 * user you can't send the data :->
6824 	 */
6825 
6826 	/* now free everything */
6827 	if (ca->inp) {
6828 		/* Lets clear the flag to allow others to run. */
6829 		ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6830 	}
6831 	sctp_m_freem(ca->m);
6832 	SCTP_FREE(ca, SCTP_M_COPYAL);
6833 }
6834 
6835 static struct mbuf *
6836 sctp_copy_out_all(struct uio *uio, ssize_t len)
6837 {
6838 	struct mbuf *ret, *at;
6839 	ssize_t left, willcpy, cancpy, error;
6840 
6841 	ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6842 	if (ret == NULL) {
6843 		/* TSNH */
6844 		return (NULL);
6845 	}
6846 	left = len;
6847 	SCTP_BUF_LEN(ret) = 0;
6848 	/* save space for the data chunk header */
6849 	cancpy = (int)M_TRAILINGSPACE(ret);
6850 	willcpy = min(cancpy, left);
6851 	at = ret;
6852 	while (left > 0) {
6853 		/* Align data to the end */
6854 		error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
6855 		if (error) {
6856 	err_out_now:
6857 			sctp_m_freem(at);
6858 			return (NULL);
6859 		}
6860 		SCTP_BUF_LEN(at) = (int)willcpy;
6861 		SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6862 		left -= willcpy;
6863 		if (left > 0) {
6864 			SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
6865 			if (SCTP_BUF_NEXT(at) == NULL) {
6866 				goto err_out_now;
6867 			}
6868 			at = SCTP_BUF_NEXT(at);
6869 			SCTP_BUF_LEN(at) = 0;
6870 			cancpy = (int)M_TRAILINGSPACE(at);
6871 			willcpy = min(cancpy, left);
6872 		}
6873 	}
6874 	return (ret);
6875 }
6876 
6877 static int
6878 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6879     struct sctp_sndrcvinfo *srcv)
6880 {
6881 	int ret;
6882 	struct sctp_copy_all *ca;
6883 
6884 	if (inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) {
6885 		/* There is another. */
6886 		return (EBUSY);
6887 	}
6888 	if (uio->uio_resid > SCTP_MAX_SENDALL_LIMIT) {
6889 		/* You must be less than the max! */
6890 		return (EMSGSIZE);
6891 	}
6892 	SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6893 	    SCTP_M_COPYAL);
6894 	if (ca == NULL) {
6895 		sctp_m_freem(m);
6896 		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6897 		return (ENOMEM);
6898 	}
6899 	memset(ca, 0, sizeof(struct sctp_copy_all));
6900 
6901 	ca->inp = inp;
6902 	if (srcv) {
6903 		memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6904 	}
6905 	/*
6906 	 * take off the sendall flag, it would be bad if we failed to do
6907 	 * this :-0
6908 	 */
6909 	ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6910 	/* get length and mbuf chain */
6911 	if (uio) {
6912 		ca->sndlen = uio->uio_resid;
6913 		ca->m = sctp_copy_out_all(uio, ca->sndlen);
6914 		if (ca->m == NULL) {
6915 			SCTP_FREE(ca, SCTP_M_COPYAL);
6916 			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6917 			return (ENOMEM);
6918 		}
6919 	} else {
6920 		/* Gather the length of the send */
6921 		struct mbuf *mat;
6922 
6923 		ca->sndlen = 0;
6924 		for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6925 			ca->sndlen += SCTP_BUF_LEN(mat);
6926 		}
6927 	}
6928 	inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
6929 	ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6930 	    SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6931 	    SCTP_ASOC_ANY_STATE,
6932 	    (void *)ca, 0,
6933 	    sctp_sendall_completes, inp, 1);
6934 	if (ret) {
6935 		SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6936 		SCTP_FREE(ca, SCTP_M_COPYAL);
6937 		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6938 		return (EFAULT);
6939 	}
6940 	return (0);
6941 }
6942 
6943 
6944 void
6945 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6946 {
6947 	struct sctp_tmit_chunk *chk, *nchk;
6948 
6949 	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6950 		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6951 			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6952 			asoc->ctrl_queue_cnt--;
6953 			if (chk->data) {
6954 				sctp_m_freem(chk->data);
6955 				chk->data = NULL;
6956 			}
6957 			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6958 		}
6959 	}
6960 }
6961 
6962 void
6963 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6964 {
6965 	struct sctp_association *asoc;
6966 	struct sctp_tmit_chunk *chk, *nchk;
6967 	struct sctp_asconf_chunk *acp;
6968 
6969 	asoc = &stcb->asoc;
6970 	TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6971 		/* find SCTP_ASCONF chunk in queue */
6972 		if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6973 			if (chk->data) {
6974 				acp = mtod(chk->data, struct sctp_asconf_chunk *);
6975 				if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6976 					/* Not Acked yet */
6977 					break;
6978 				}
6979 			}
6980 			TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6981 			asoc->ctrl_queue_cnt--;
6982 			if (chk->data) {
6983 				sctp_m_freem(chk->data);
6984 				chk->data = NULL;
6985 			}
6986 			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6987 		}
6988 	}
6989 }
6990 
6991 
6992 static void
6993 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6994     struct sctp_association *asoc,
6995     struct sctp_tmit_chunk **data_list,
6996     int bundle_at,
6997     struct sctp_nets *net)
6998 {
6999 	int i;
7000 	struct sctp_tmit_chunk *tp1;
7001 
7002 	for (i = 0; i < bundle_at; i++) {
7003 		/* off of the send queue */
7004 		TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
7005 		asoc->send_queue_cnt--;
7006 		if (i > 0) {
7007 			/*
7008 			 * Any chunk NOT 0 you zap the time chunk 0 gets
7009 			 * zapped or set based on if a RTO measurment is
7010 			 * needed.
7011 			 */
7012 			data_list[i]->do_rtt = 0;
7013 		}
7014 		/* record time */
7015 		data_list[i]->sent_rcv_time = net->last_sent_time;
7016 		data_list[i]->rec.data.cwnd_at_send = net->cwnd;
7017 		data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
7018 		if (data_list[i]->whoTo == NULL) {
7019 			data_list[i]->whoTo = net;
7020 			atomic_add_int(&net->ref_count, 1);
7021 		}
7022 		/* on to the sent queue */
7023 		tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
7024 		if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7025 			struct sctp_tmit_chunk *tpp;
7026 
7027 			/* need to move back */
7028 	back_up_more:
7029 			tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
7030 			if (tpp == NULL) {
7031 				TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
7032 				goto all_done;
7033 			}
7034 			tp1 = tpp;
7035 			if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
7036 				goto back_up_more;
7037 			}
7038 			TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
7039 		} else {
7040 			TAILQ_INSERT_TAIL(&asoc->sent_queue,
7041 			    data_list[i],
7042 			    sctp_next);
7043 		}
7044 all_done:
7045 		/* This does not lower until the cum-ack passes it */
7046 		asoc->sent_queue_cnt++;
7047 		if ((asoc->peers_rwnd <= 0) &&
7048 		    (asoc->total_flight == 0) &&
7049 		    (bundle_at == 1)) {
7050 			/* Mark the chunk as being a window probe */
7051 			SCTP_STAT_INCR(sctps_windowprobed);
7052 		}
7053 #ifdef SCTP_AUDITING_ENABLED
7054 		sctp_audit_log(0xC2, 3);
7055 #endif
7056 		data_list[i]->sent = SCTP_DATAGRAM_SENT;
7057 		data_list[i]->snd_count = 1;
7058 		data_list[i]->rec.data.chunk_was_revoked = 0;
7059 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7060 			sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7061 			    data_list[i]->whoTo->flight_size,
7062 			    data_list[i]->book_size,
7063 			    (uint32_t)(uintptr_t)data_list[i]->whoTo,
7064 			    data_list[i]->rec.data.tsn);
7065 		}
7066 		sctp_flight_size_increase(data_list[i]);
7067 		sctp_total_flight_increase(stcb, data_list[i]);
7068 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7069 			sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7070 			    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7071 		}
7072 		asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7073 		    (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7074 		if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7075 			/* SWS sender side engages */
7076 			asoc->peers_rwnd = 0;
7077 		}
7078 	}
7079 	if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7080 		(*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7081 	}
7082 }
7083 
7084 static void
7085 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7086 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7087     SCTP_UNUSED
7088 #endif
7089 )
7090 {
7091 	struct sctp_tmit_chunk *chk, *nchk;
7092 
7093 	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7094 		if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7095 		    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
7096 		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7097 		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7098 		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7099 		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7100 		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7101 		    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7102 		    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7103 		    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7104 		    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7105 		    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7106 			/* Stray chunks must be cleaned up */
7107 	clean_up_anyway:
7108 			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7109 			asoc->ctrl_queue_cnt--;
7110 			if (chk->data) {
7111 				sctp_m_freem(chk->data);
7112 				chk->data = NULL;
7113 			}
7114 			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
7115 				asoc->fwd_tsn_cnt--;
7116 			}
7117 			sctp_free_a_chunk(stcb, chk, so_locked);
7118 		} else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7119 			/* special handling, we must look into the param */
7120 			if (chk != asoc->str_reset) {
7121 				goto clean_up_anyway;
7122 			}
7123 		}
7124 	}
7125 }
7126 
7127 static uint32_t
7128 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7129     uint32_t space_left, uint32_t frag_point, int eeor_on)
7130 {
7131 	/*
7132 	 * Make a decision on if I should split a msg into multiple parts.
7133 	 * This is only asked of incomplete messages.
7134 	 */
7135 	if (eeor_on) {
7136 		/*
7137 		 * If we are doing EEOR we need to always send it if its the
7138 		 * entire thing, since it might be all the guy is putting in
7139 		 * the hopper.
7140 		 */
7141 		if (space_left >= length) {
7142 			/*-
7143 			 * If we have data outstanding,
7144 			 * we get another chance when the sack
7145 			 * arrives to transmit - wait for more data
7146 			 */
7147 			if (stcb->asoc.total_flight == 0) {
7148 				/*
7149 				 * If nothing is in flight, we zero the
7150 				 * packet counter.
7151 				 */
7152 				return (length);
7153 			}
7154 			return (0);
7155 
7156 		} else {
7157 			/* You can fill the rest */
7158 			return (space_left);
7159 		}
7160 	}
7161 	/*-
7162 	 * For those strange folk that make the send buffer
7163 	 * smaller than our fragmentation point, we can't
7164 	 * get a full msg in so we have to allow splitting.
7165 	 */
7166 	if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7167 		return (length);
7168 	}
7169 	if ((length <= space_left) ||
7170 	    ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7171 		/* Sub-optimial residual don't split in non-eeor mode. */
7172 		return (0);
7173 	}
7174 	/*
7175 	 * If we reach here length is larger than the space_left. Do we wish
7176 	 * to split it for the sake of packet putting together?
7177 	 */
7178 	if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7179 		/* Its ok to split it */
7180 		return (min(space_left, frag_point));
7181 	}
7182 	/* Nope, can't split */
7183 	return (0);
7184 }
7185 
7186 static uint32_t
7187 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7188     struct sctp_stream_out *strq,
7189     uint32_t space_left,
7190     uint32_t frag_point,
7191     int *giveup,
7192     int eeor_mode,
7193     int *bail,
7194     int so_locked
7195 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7196     SCTP_UNUSED
7197 #endif
7198 )
7199 {
7200 	/* Move from the stream to the send_queue keeping track of the total */
7201 	struct sctp_association *asoc;
7202 	struct sctp_stream_queue_pending *sp;
7203 	struct sctp_tmit_chunk *chk;
7204 	struct sctp_data_chunk *dchkh = NULL;
7205 	struct sctp_idata_chunk *ndchkh = NULL;
7206 	uint32_t to_move, length;
7207 	int leading;
7208 	uint8_t rcv_flags = 0;
7209 	uint8_t some_taken;
7210 	uint8_t send_lock_up = 0;
7211 
7212 	SCTP_TCB_LOCK_ASSERT(stcb);
7213 	asoc = &stcb->asoc;
7214 one_more_time:
7215 	/* sa_ignore FREED_MEMORY */
7216 	sp = TAILQ_FIRST(&strq->outqueue);
7217 	if (sp == NULL) {
7218 		if (send_lock_up == 0) {
7219 			SCTP_TCB_SEND_LOCK(stcb);
7220 			send_lock_up = 1;
7221 		}
7222 		sp = TAILQ_FIRST(&strq->outqueue);
7223 		if (sp) {
7224 			goto one_more_time;
7225 		}
7226 		if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7227 		    (stcb->asoc.idata_supported == 0) &&
7228 		    (strq->last_msg_incomplete)) {
7229 			SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7230 			    strq->sid,
7231 			    strq->last_msg_incomplete);
7232 			strq->last_msg_incomplete = 0;
7233 		}
7234 		to_move = 0;
7235 		if (send_lock_up) {
7236 			SCTP_TCB_SEND_UNLOCK(stcb);
7237 			send_lock_up = 0;
7238 		}
7239 		goto out_of;
7240 	}
7241 	if ((sp->msg_is_complete) && (sp->length == 0)) {
7242 		if (sp->sender_all_done) {
7243 			/*
7244 			 * We are doing deferred cleanup. Last time through
7245 			 * when we took all the data the sender_all_done was
7246 			 * not set.
7247 			 */
7248 			if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7249 				SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7250 				SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7251 				    sp->sender_all_done,
7252 				    sp->length,
7253 				    sp->msg_is_complete,
7254 				    sp->put_last_out,
7255 				    send_lock_up);
7256 			}
7257 			if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7258 				SCTP_TCB_SEND_LOCK(stcb);
7259 				send_lock_up = 1;
7260 			}
7261 			atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7262 			TAILQ_REMOVE(&strq->outqueue, sp, next);
7263 			stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7264 			if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7265 			    (strq->chunks_on_queues == 0) &&
7266 			    TAILQ_EMPTY(&strq->outqueue)) {
7267 				stcb->asoc.trigger_reset = 1;
7268 			}
7269 			if (sp->net) {
7270 				sctp_free_remote_addr(sp->net);
7271 				sp->net = NULL;
7272 			}
7273 			if (sp->data) {
7274 				sctp_m_freem(sp->data);
7275 				sp->data = NULL;
7276 			}
7277 			sctp_free_a_strmoq(stcb, sp, so_locked);
7278 			/* we can't be locked to it */
7279 			if (send_lock_up) {
7280 				SCTP_TCB_SEND_UNLOCK(stcb);
7281 				send_lock_up = 0;
7282 			}
7283 			/* back to get the next msg */
7284 			goto one_more_time;
7285 		} else {
7286 			/*
7287 			 * sender just finished this but still holds a
7288 			 * reference
7289 			 */
7290 			*giveup = 1;
7291 			to_move = 0;
7292 			goto out_of;
7293 		}
7294 	} else {
7295 		/* is there some to get */
7296 		if (sp->length == 0) {
7297 			/* no */
7298 			*giveup = 1;
7299 			to_move = 0;
7300 			goto out_of;
7301 		} else if (sp->discard_rest) {
7302 			if (send_lock_up == 0) {
7303 				SCTP_TCB_SEND_LOCK(stcb);
7304 				send_lock_up = 1;
7305 			}
7306 			/* Whack down the size */
7307 			atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7308 			if ((stcb->sctp_socket != NULL) &&
7309 			    ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7310 			    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7311 				atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7312 			}
7313 			if (sp->data) {
7314 				sctp_m_freem(sp->data);
7315 				sp->data = NULL;
7316 				sp->tail_mbuf = NULL;
7317 			}
7318 			sp->length = 0;
7319 			sp->some_taken = 1;
7320 			*giveup = 1;
7321 			to_move = 0;
7322 			goto out_of;
7323 		}
7324 	}
7325 	some_taken = sp->some_taken;
7326 re_look:
7327 	length = sp->length;
7328 	if (sp->msg_is_complete) {
7329 		/* The message is complete */
7330 		to_move = min(length, frag_point);
7331 		if (to_move == length) {
7332 			/* All of it fits in the MTU */
7333 			if (sp->some_taken) {
7334 				rcv_flags |= SCTP_DATA_LAST_FRAG;
7335 			} else {
7336 				rcv_flags |= SCTP_DATA_NOT_FRAG;
7337 			}
7338 			sp->put_last_out = 1;
7339 			if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7340 				rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7341 			}
7342 		} else {
7343 			/* Not all of it fits, we fragment */
7344 			if (sp->some_taken == 0) {
7345 				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7346 			}
7347 			sp->some_taken = 1;
7348 		}
7349 	} else {
7350 		to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7351 		if (to_move) {
7352 			/*-
7353 			 * We use a snapshot of length in case it
7354 			 * is expanding during the compare.
7355 			 */
7356 			uint32_t llen;
7357 
7358 			llen = length;
7359 			if (to_move >= llen) {
7360 				to_move = llen;
7361 				if (send_lock_up == 0) {
7362 					/*-
7363 					 * We are taking all of an incomplete msg
7364 					 * thus we need a send lock.
7365 					 */
7366 					SCTP_TCB_SEND_LOCK(stcb);
7367 					send_lock_up = 1;
7368 					if (sp->msg_is_complete) {
7369 						/*
7370 						 * the sender finished the
7371 						 * msg
7372 						 */
7373 						goto re_look;
7374 					}
7375 				}
7376 			}
7377 			if (sp->some_taken == 0) {
7378 				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7379 				sp->some_taken = 1;
7380 			}
7381 		} else {
7382 			/* Nothing to take. */
7383 			*giveup = 1;
7384 			to_move = 0;
7385 			goto out_of;
7386 		}
7387 	}
7388 
7389 	/* If we reach here, we can copy out a chunk */
7390 	sctp_alloc_a_chunk(stcb, chk);
7391 	if (chk == NULL) {
7392 		/* No chunk memory */
7393 		*giveup = 1;
7394 		to_move = 0;
7395 		goto out_of;
7396 	}
7397 	/*
7398 	 * Setup for unordered if needed by looking at the user sent info
7399 	 * flags.
7400 	 */
7401 	if (sp->sinfo_flags & SCTP_UNORDERED) {
7402 		rcv_flags |= SCTP_DATA_UNORDERED;
7403 	}
7404 	if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7405 	    (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7406 		rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7407 	}
7408 	/* clear out the chunk before setting up */
7409 	memset(chk, 0, sizeof(*chk));
7410 	chk->rec.data.rcv_flags = rcv_flags;
7411 
7412 	if (to_move >= length) {
7413 		/* we think we can steal the whole thing */
7414 		if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7415 			SCTP_TCB_SEND_LOCK(stcb);
7416 			send_lock_up = 1;
7417 		}
7418 		if (to_move < sp->length) {
7419 			/* bail, it changed */
7420 			goto dont_do_it;
7421 		}
7422 		chk->data = sp->data;
7423 		chk->last_mbuf = sp->tail_mbuf;
7424 		/* register the stealing */
7425 		sp->data = sp->tail_mbuf = NULL;
7426 	} else {
7427 		struct mbuf *m;
7428 
7429 dont_do_it:
7430 		chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7431 		chk->last_mbuf = NULL;
7432 		if (chk->data == NULL) {
7433 			sp->some_taken = some_taken;
7434 			sctp_free_a_chunk(stcb, chk, so_locked);
7435 			*bail = 1;
7436 			to_move = 0;
7437 			goto out_of;
7438 		}
7439 #ifdef SCTP_MBUF_LOGGING
7440 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7441 			sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7442 		}
7443 #endif
7444 		/* Pull off the data */
7445 		m_adj(sp->data, to_move);
7446 		/* Now lets work our way down and compact it */
7447 		m = sp->data;
7448 		while (m && (SCTP_BUF_LEN(m) == 0)) {
7449 			sp->data = SCTP_BUF_NEXT(m);
7450 			SCTP_BUF_NEXT(m) = NULL;
7451 			if (sp->tail_mbuf == m) {
7452 				/*-
7453 				 * Freeing tail? TSNH since
7454 				 * we supposedly were taking less
7455 				 * than the sp->length.
7456 				 */
7457 #ifdef INVARIANTS
7458 				panic("Huh, freing tail? - TSNH");
7459 #else
7460 				SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7461 				sp->tail_mbuf = sp->data = NULL;
7462 				sp->length = 0;
7463 #endif
7464 
7465 			}
7466 			sctp_m_free(m);
7467 			m = sp->data;
7468 		}
7469 	}
7470 	if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7471 		chk->copy_by_ref = 1;
7472 	} else {
7473 		chk->copy_by_ref = 0;
7474 	}
7475 	/*
7476 	 * get last_mbuf and counts of mb usage This is ugly but hopefully
7477 	 * its only one mbuf.
7478 	 */
7479 	if (chk->last_mbuf == NULL) {
7480 		chk->last_mbuf = chk->data;
7481 		while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7482 			chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7483 		}
7484 	}
7485 
7486 	if (to_move > length) {
7487 		/*- This should not happen either
7488 		 * since we always lower to_move to the size
7489 		 * of sp->length if its larger.
7490 		 */
7491 #ifdef INVARIANTS
7492 		panic("Huh, how can to_move be larger?");
7493 #else
7494 		SCTP_PRINTF("Huh, how can to_move be larger?\n");
7495 		sp->length = 0;
7496 #endif
7497 	} else {
7498 		atomic_subtract_int(&sp->length, to_move);
7499 	}
7500 	leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
7501 	if (M_LEADINGSPACE(chk->data) < leading) {
7502 		/* Not enough room for a chunk header, get some */
7503 		struct mbuf *m;
7504 
7505 		m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
7506 		if (m == NULL) {
7507 			/*
7508 			 * we're in trouble here. _PREPEND below will free
7509 			 * all the data if there is no leading space, so we
7510 			 * must put the data back and restore.
7511 			 */
7512 			if (send_lock_up == 0) {
7513 				SCTP_TCB_SEND_LOCK(stcb);
7514 				send_lock_up = 1;
7515 			}
7516 			if (sp->data == NULL) {
7517 				/* unsteal the data */
7518 				sp->data = chk->data;
7519 				sp->tail_mbuf = chk->last_mbuf;
7520 			} else {
7521 				struct mbuf *m_tmp;
7522 
7523 				/* reassemble the data */
7524 				m_tmp = sp->data;
7525 				sp->data = chk->data;
7526 				SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7527 			}
7528 			sp->some_taken = some_taken;
7529 			atomic_add_int(&sp->length, to_move);
7530 			chk->data = NULL;
7531 			*bail = 1;
7532 			sctp_free_a_chunk(stcb, chk, so_locked);
7533 			to_move = 0;
7534 			goto out_of;
7535 		} else {
7536 			SCTP_BUF_LEN(m) = 0;
7537 			SCTP_BUF_NEXT(m) = chk->data;
7538 			chk->data = m;
7539 			M_ALIGN(chk->data, 4);
7540 		}
7541 	}
7542 	SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
7543 	if (chk->data == NULL) {
7544 		/* HELP, TSNH since we assured it would not above? */
7545 #ifdef INVARIANTS
7546 		panic("prepend failes HELP?");
7547 #else
7548 		SCTP_PRINTF("prepend fails HELP?\n");
7549 		sctp_free_a_chunk(stcb, chk, so_locked);
7550 #endif
7551 		*bail = 1;
7552 		to_move = 0;
7553 		goto out_of;
7554 	}
7555 	sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
7556 	chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
7557 	chk->book_size_scale = 0;
7558 	chk->sent = SCTP_DATAGRAM_UNSENT;
7559 
7560 	chk->flags = 0;
7561 	chk->asoc = &stcb->asoc;
7562 	chk->pad_inplace = 0;
7563 	chk->no_fr_allowed = 0;
7564 	if (stcb->asoc.idata_supported == 0) {
7565 		if (rcv_flags & SCTP_DATA_UNORDERED) {
7566 			/* Just use 0. The receiver ignores the values. */
7567 			chk->rec.data.mid = 0;
7568 		} else {
7569 			chk->rec.data.mid = strq->next_mid_ordered;
7570 			if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7571 				strq->next_mid_ordered++;
7572 			}
7573 		}
7574 	} else {
7575 		if (rcv_flags & SCTP_DATA_UNORDERED) {
7576 			chk->rec.data.mid = strq->next_mid_unordered;
7577 			if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7578 				strq->next_mid_unordered++;
7579 			}
7580 		} else {
7581 			chk->rec.data.mid = strq->next_mid_ordered;
7582 			if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7583 				strq->next_mid_ordered++;
7584 			}
7585 		}
7586 	}
7587 	chk->rec.data.sid = sp->sid;
7588 	chk->rec.data.ppid = sp->ppid;
7589 	chk->rec.data.context = sp->context;
7590 	chk->rec.data.doing_fast_retransmit = 0;
7591 
7592 	chk->rec.data.timetodrop = sp->ts;
7593 	chk->flags = sp->act_flags;
7594 
7595 	if (sp->net) {
7596 		chk->whoTo = sp->net;
7597 		atomic_add_int(&chk->whoTo->ref_count, 1);
7598 	} else
7599 		chk->whoTo = NULL;
7600 
7601 	if (sp->holds_key_ref) {
7602 		chk->auth_keyid = sp->auth_keyid;
7603 		sctp_auth_key_acquire(stcb, chk->auth_keyid);
7604 		chk->holds_key_ref = 1;
7605 	}
7606 	chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7607 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7608 		sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7609 		    (uint32_t)(uintptr_t)stcb, sp->length,
7610 		    (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7611 		    chk->rec.data.tsn);
7612 	}
7613 	if (stcb->asoc.idata_supported == 0) {
7614 		dchkh = mtod(chk->data, struct sctp_data_chunk *);
7615 	} else {
7616 		ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7617 	}
7618 	/*
7619 	 * Put the rest of the things in place now. Size was done earlier in
7620 	 * previous loop prior to padding.
7621 	 */
7622 
7623 #ifdef SCTP_ASOCLOG_OF_TSNS
7624 	SCTP_TCB_LOCK_ASSERT(stcb);
7625 	if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7626 		asoc->tsn_out_at = 0;
7627 		asoc->tsn_out_wrapped = 1;
7628 	}
7629 	asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7630 	asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7631 	asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7632 	asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7633 	asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7634 	asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7635 	asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7636 	asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7637 	asoc->tsn_out_at++;
7638 #endif
7639 	if (stcb->asoc.idata_supported == 0) {
7640 		dchkh->ch.chunk_type = SCTP_DATA;
7641 		dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7642 		dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7643 		dchkh->dp.sid = htons(strq->sid);
7644 		dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7645 		dchkh->dp.ppid = chk->rec.data.ppid;
7646 		dchkh->ch.chunk_length = htons(chk->send_size);
7647 	} else {
7648 		ndchkh->ch.chunk_type = SCTP_IDATA;
7649 		ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7650 		ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7651 		ndchkh->dp.sid = htons(strq->sid);
7652 		ndchkh->dp.reserved = htons(0);
7653 		ndchkh->dp.mid = htonl(chk->rec.data.mid);
7654 		if (sp->fsn == 0)
7655 			ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7656 		else
7657 			ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7658 		sp->fsn++;
7659 		ndchkh->ch.chunk_length = htons(chk->send_size);
7660 	}
7661 	/* Now advance the chk->send_size by the actual pad needed. */
7662 	if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7663 		/* need a pad */
7664 		struct mbuf *lm;
7665 		int pads;
7666 
7667 		pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7668 		lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7669 		if (lm != NULL) {
7670 			chk->last_mbuf = lm;
7671 			chk->pad_inplace = 1;
7672 		}
7673 		chk->send_size += pads;
7674 	}
7675 	if (PR_SCTP_ENABLED(chk->flags)) {
7676 		asoc->pr_sctp_cnt++;
7677 	}
7678 	if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7679 		/* All done pull and kill the message */
7680 		if (sp->put_last_out == 0) {
7681 			SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7682 			SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7683 			    sp->sender_all_done,
7684 			    sp->length,
7685 			    sp->msg_is_complete,
7686 			    sp->put_last_out,
7687 			    send_lock_up);
7688 		}
7689 		if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7690 			SCTP_TCB_SEND_LOCK(stcb);
7691 			send_lock_up = 1;
7692 		}
7693 		atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7694 		TAILQ_REMOVE(&strq->outqueue, sp, next);
7695 		stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7696 		if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7697 		    (strq->chunks_on_queues == 0) &&
7698 		    TAILQ_EMPTY(&strq->outqueue)) {
7699 			stcb->asoc.trigger_reset = 1;
7700 		}
7701 		if (sp->net) {
7702 			sctp_free_remote_addr(sp->net);
7703 			sp->net = NULL;
7704 		}
7705 		if (sp->data) {
7706 			sctp_m_freem(sp->data);
7707 			sp->data = NULL;
7708 		}
7709 		sctp_free_a_strmoq(stcb, sp, so_locked);
7710 	}
7711 	asoc->chunks_on_out_queue++;
7712 	strq->chunks_on_queues++;
7713 	TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7714 	asoc->send_queue_cnt++;
7715 out_of:
7716 	if (send_lock_up) {
7717 		SCTP_TCB_SEND_UNLOCK(stcb);
7718 	}
7719 	return (to_move);
7720 }
7721 
7722 
7723 static void
7724 sctp_fill_outqueue(struct sctp_tcb *stcb,
7725     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7726 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7727     SCTP_UNUSED
7728 #endif
7729 )
7730 {
7731 	struct sctp_association *asoc;
7732 	struct sctp_stream_out *strq;
7733 	uint32_t space_left, moved, total_moved;
7734 	int bail, giveup;
7735 
7736 	SCTP_TCB_LOCK_ASSERT(stcb);
7737 	asoc = &stcb->asoc;
7738 	total_moved = 0;
7739 	switch (net->ro._l_addr.sa.sa_family) {
7740 #ifdef INET
7741 	case AF_INET:
7742 		space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7743 		break;
7744 #endif
7745 #ifdef INET6
7746 	case AF_INET6:
7747 		space_left = net->mtu - SCTP_MIN_OVERHEAD;
7748 		break;
7749 #endif
7750 	default:
7751 		/* TSNH */
7752 		space_left = net->mtu;
7753 		break;
7754 	}
7755 	/* Need an allowance for the data chunk header too */
7756 	space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7757 
7758 	/* must make even word boundary */
7759 	space_left &= 0xfffffffc;
7760 	strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7761 	giveup = 0;
7762 	bail = 0;
7763 	while ((space_left > 0) && (strq != NULL)) {
7764 		moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7765 		    &giveup, eeor_mode, &bail, so_locked);
7766 		stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7767 		if ((giveup != 0) || (bail != 0)) {
7768 			break;
7769 		}
7770 		strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7771 		total_moved += moved;
7772 		space_left -= moved;
7773 		if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
7774 			space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
7775 		} else {
7776 			space_left = 0;
7777 		}
7778 		space_left &= 0xfffffffc;
7779 	}
7780 	if (bail != 0)
7781 		*quit_now = 1;
7782 
7783 	stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7784 
7785 	if (total_moved == 0) {
7786 		if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7787 		    (net == stcb->asoc.primary_destination)) {
7788 			/* ran dry for primary network net */
7789 			SCTP_STAT_INCR(sctps_primary_randry);
7790 		} else if (stcb->asoc.sctp_cmt_on_off > 0) {
7791 			/* ran dry with CMT on */
7792 			SCTP_STAT_INCR(sctps_cmt_randry);
7793 		}
7794 	}
7795 }
7796 
7797 void
7798 sctp_fix_ecn_echo(struct sctp_association *asoc)
7799 {
7800 	struct sctp_tmit_chunk *chk;
7801 
7802 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7803 		if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7804 			chk->sent = SCTP_DATAGRAM_UNSENT;
7805 		}
7806 	}
7807 }
7808 
7809 void
7810 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7811 {
7812 	struct sctp_association *asoc;
7813 	struct sctp_tmit_chunk *chk;
7814 	struct sctp_stream_queue_pending *sp;
7815 	unsigned int i;
7816 
7817 	if (net == NULL) {
7818 		return;
7819 	}
7820 	asoc = &stcb->asoc;
7821 	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7822 		TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7823 			if (sp->net == net) {
7824 				sctp_free_remote_addr(sp->net);
7825 				sp->net = NULL;
7826 			}
7827 		}
7828 	}
7829 	TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7830 		if (chk->whoTo == net) {
7831 			sctp_free_remote_addr(chk->whoTo);
7832 			chk->whoTo = NULL;
7833 		}
7834 	}
7835 }
7836 
7837 int
7838 sctp_med_chunk_output(struct sctp_inpcb *inp,
7839     struct sctp_tcb *stcb,
7840     struct sctp_association *asoc,
7841     int *num_out,
7842     int *reason_code,
7843     int control_only, int from_where,
7844     struct timeval *now, int *now_filled, int frag_point, int so_locked
7845 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7846     SCTP_UNUSED
7847 #endif
7848 )
7849 {
7850 	/**
7851 	 * Ok this is the generic chunk service queue. we must do the
7852 	 * following:
7853 	 * - Service the stream queue that is next, moving any
7854 	 *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7855 	 *   LAST to the out queue in one pass) and assigning TSN's. This
7856 	 *   only applys though if the peer does not support NDATA. For NDATA
7857 	 *   chunks its ok to not send the entire message ;-)
7858 	 * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7859 	 *   fomulate and send the low level chunks. Making sure to combine
7860 	 *   any control in the control chunk queue also.
7861 	 */
7862 	struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7863 	struct mbuf *outchain, *endoutchain;
7864 	struct sctp_tmit_chunk *chk, *nchk;
7865 
7866 	/* temp arrays for unlinking */
7867 	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7868 	int no_fragmentflg, error;
7869 	unsigned int max_rwnd_per_dest, max_send_per_dest;
7870 	int one_chunk, hbflag, skip_data_for_this_net;
7871 	int asconf, cookie, no_out_cnt;
7872 	int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7873 	unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7874 	int tsns_sent = 0;
7875 	uint32_t auth_offset;
7876 	struct sctp_auth_chunk *auth;
7877 	uint16_t auth_keyid;
7878 	int override_ok = 1;
7879 	int skip_fill_up = 0;
7880 	int data_auth_reqd = 0;
7881 
7882 	/*
7883 	 * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7884 	 * destination.
7885 	 */
7886 	int quit_now = 0;
7887 
7888 	*num_out = 0;
7889 	*reason_code = 0;
7890 	auth_keyid = stcb->asoc.authinfo.active_keyid;
7891 	if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7892 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
7893 	    (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7894 		eeor_mode = 1;
7895 	} else {
7896 		eeor_mode = 0;
7897 	}
7898 	ctl_cnt = no_out_cnt = asconf = cookie = 0;
7899 	/*
7900 	 * First lets prime the pump. For each destination, if there is room
7901 	 * in the flight size, attempt to pull an MTU's worth out of the
7902 	 * stream queues into the general send_queue
7903 	 */
7904 #ifdef SCTP_AUDITING_ENABLED
7905 	sctp_audit_log(0xC2, 2);
7906 #endif
7907 	SCTP_TCB_LOCK_ASSERT(stcb);
7908 	hbflag = 0;
7909 	if (control_only)
7910 		no_data_chunks = 1;
7911 	else
7912 		no_data_chunks = 0;
7913 
7914 	/* Nothing to possible to send? */
7915 	if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7916 	    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7917 	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7918 	    TAILQ_EMPTY(&asoc->send_queue) &&
7919 	    sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7920 nothing_to_send:
7921 		*reason_code = 9;
7922 		return (0);
7923 	}
7924 	if (asoc->peers_rwnd == 0) {
7925 		/* No room in peers rwnd */
7926 		*reason_code = 1;
7927 		if (asoc->total_flight > 0) {
7928 			/* we are allowed one chunk in flight */
7929 			no_data_chunks = 1;
7930 		}
7931 	}
7932 	if (stcb->asoc.ecn_echo_cnt_onq) {
7933 		/* Record where a sack goes, if any */
7934 		if (no_data_chunks &&
7935 		    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7936 			/* Nothing but ECNe to send - we don't do that */
7937 			goto nothing_to_send;
7938 		}
7939 		TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7940 			if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7941 			    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7942 				sack_goes_to = chk->whoTo;
7943 				break;
7944 			}
7945 		}
7946 	}
7947 	max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7948 	if (stcb->sctp_socket)
7949 		max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7950 	else
7951 		max_send_per_dest = 0;
7952 	if (no_data_chunks == 0) {
7953 		/* How many non-directed chunks are there? */
7954 		TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7955 			if (chk->whoTo == NULL) {
7956 				/*
7957 				 * We already have non-directed chunks on
7958 				 * the queue, no need to do a fill-up.
7959 				 */
7960 				skip_fill_up = 1;
7961 				break;
7962 			}
7963 		}
7964 
7965 	}
7966 	if ((no_data_chunks == 0) &&
7967 	    (skip_fill_up == 0) &&
7968 	    (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7969 		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7970 			/*
7971 			 * This for loop we are in takes in each net, if
7972 			 * its's got space in cwnd and has data sent to it
7973 			 * (when CMT is off) then it calls
7974 			 * sctp_fill_outqueue for the net. This gets data on
7975 			 * the send queue for that network.
7976 			 *
7977 			 * In sctp_fill_outqueue TSN's are assigned and data
7978 			 * is copied out of the stream buffers. Note mostly
7979 			 * copy by reference (we hope).
7980 			 */
7981 			net->window_probe = 0;
7982 			if ((net != stcb->asoc.alternate) &&
7983 			    ((net->dest_state & SCTP_ADDR_PF) ||
7984 			    (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7985 			    (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7986 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7987 					sctp_log_cwnd(stcb, net, 1,
7988 					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7989 				}
7990 				continue;
7991 			}
7992 			if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7993 			    (net->flight_size == 0)) {
7994 				(*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7995 			}
7996 			if (net->flight_size >= net->cwnd) {
7997 				/* skip this network, no room - can't fill */
7998 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7999 					sctp_log_cwnd(stcb, net, 3,
8000 					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
8001 				}
8002 				continue;
8003 			}
8004 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8005 				sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
8006 			}
8007 			sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
8008 			if (quit_now) {
8009 				/* memory alloc failure */
8010 				no_data_chunks = 1;
8011 				break;
8012 			}
8013 		}
8014 	}
8015 	/* now service each destination and send out what we can for it */
8016 	/* Nothing to send? */
8017 	if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8018 	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8019 	    TAILQ_EMPTY(&asoc->send_queue)) {
8020 		*reason_code = 8;
8021 		return (0);
8022 	}
8023 
8024 	if (asoc->sctp_cmt_on_off > 0) {
8025 		/* get the last start point */
8026 		start_at = asoc->last_net_cmt_send_started;
8027 		if (start_at == NULL) {
8028 			/* null so to beginning */
8029 			start_at = TAILQ_FIRST(&asoc->nets);
8030 		} else {
8031 			start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
8032 			if (start_at == NULL) {
8033 				start_at = TAILQ_FIRST(&asoc->nets);
8034 			}
8035 		}
8036 		asoc->last_net_cmt_send_started = start_at;
8037 	} else {
8038 		start_at = TAILQ_FIRST(&asoc->nets);
8039 	}
8040 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8041 		if (chk->whoTo == NULL) {
8042 			if (asoc->alternate) {
8043 				chk->whoTo = asoc->alternate;
8044 			} else {
8045 				chk->whoTo = asoc->primary_destination;
8046 			}
8047 			atomic_add_int(&chk->whoTo->ref_count, 1);
8048 		}
8049 	}
8050 	old_start_at = NULL;
8051 again_one_more_time:
8052 	for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8053 		/* how much can we send? */
8054 		/* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8055 		if (old_start_at && (old_start_at == net)) {
8056 			/* through list ocmpletely. */
8057 			break;
8058 		}
8059 		tsns_sent = 0xa;
8060 		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8061 		    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8062 		    (net->flight_size >= net->cwnd)) {
8063 			/*
8064 			 * Nothing on control or asconf and flight is full,
8065 			 * we can skip even in the CMT case.
8066 			 */
8067 			continue;
8068 		}
8069 		bundle_at = 0;
8070 		endoutchain = outchain = NULL;
8071 		auth = NULL;
8072 		auth_offset = 0;
8073 		no_fragmentflg = 1;
8074 		one_chunk = 0;
8075 		if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8076 			skip_data_for_this_net = 1;
8077 		} else {
8078 			skip_data_for_this_net = 0;
8079 		}
8080 		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8081 #ifdef INET
8082 		case AF_INET:
8083 			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8084 			break;
8085 #endif
8086 #ifdef INET6
8087 		case AF_INET6:
8088 			mtu = net->mtu - SCTP_MIN_OVERHEAD;
8089 			break;
8090 #endif
8091 		default:
8092 			/* TSNH */
8093 			mtu = net->mtu;
8094 			break;
8095 		}
8096 		mx_mtu = mtu;
8097 		to_out = 0;
8098 		if (mtu > asoc->peers_rwnd) {
8099 			if (asoc->total_flight > 0) {
8100 				/* We have a packet in flight somewhere */
8101 				r_mtu = asoc->peers_rwnd;
8102 			} else {
8103 				/* We are always allowed to send one MTU out */
8104 				one_chunk = 1;
8105 				r_mtu = mtu;
8106 			}
8107 		} else {
8108 			r_mtu = mtu;
8109 		}
8110 		error = 0;
8111 		/************************/
8112 		/* ASCONF transmission */
8113 		/************************/
8114 		/* Now first lets go through the asconf queue */
8115 		TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8116 			if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8117 				continue;
8118 			}
8119 			if (chk->whoTo == NULL) {
8120 				if (asoc->alternate == NULL) {
8121 					if (asoc->primary_destination != net) {
8122 						break;
8123 					}
8124 				} else {
8125 					if (asoc->alternate != net) {
8126 						break;
8127 					}
8128 				}
8129 			} else {
8130 				if (chk->whoTo != net) {
8131 					break;
8132 				}
8133 			}
8134 			if (chk->data == NULL) {
8135 				break;
8136 			}
8137 			if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8138 			    chk->sent != SCTP_DATAGRAM_RESEND) {
8139 				break;
8140 			}
8141 			/*
8142 			 * if no AUTH is yet included and this chunk
8143 			 * requires it, make sure to account for it.  We
8144 			 * don't apply the size until the AUTH chunk is
8145 			 * actually added below in case there is no room for
8146 			 * this chunk. NOTE: we overload the use of "omtu"
8147 			 * here
8148 			 */
8149 			if ((auth == NULL) &&
8150 			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8151 			    stcb->asoc.peer_auth_chunks)) {
8152 				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8153 			} else
8154 				omtu = 0;
8155 			/* Here we do NOT factor the r_mtu */
8156 			if ((chk->send_size < (int)(mtu - omtu)) ||
8157 			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8158 				/*
8159 				 * We probably should glom the mbuf chain
8160 				 * from the chk->data for control but the
8161 				 * problem is it becomes yet one more level
8162 				 * of tracking to do if for some reason
8163 				 * output fails. Then I have got to
8164 				 * reconstruct the merged control chain.. el
8165 				 * yucko.. for now we take the easy way and
8166 				 * do the copy
8167 				 */
8168 				/*
8169 				 * Add an AUTH chunk, if chunk requires it
8170 				 * save the offset into the chain for AUTH
8171 				 */
8172 				if ((auth == NULL) &&
8173 				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8174 				    stcb->asoc.peer_auth_chunks))) {
8175 					outchain = sctp_add_auth_chunk(outchain,
8176 					    &endoutchain,
8177 					    &auth,
8178 					    &auth_offset,
8179 					    stcb,
8180 					    chk->rec.chunk_id.id);
8181 					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8182 				}
8183 				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8184 				    (int)chk->rec.chunk_id.can_take_data,
8185 				    chk->send_size, chk->copy_by_ref);
8186 				if (outchain == NULL) {
8187 					*reason_code = 8;
8188 					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8189 					return (ENOMEM);
8190 				}
8191 				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8192 				/* update our MTU size */
8193 				if (mtu > (chk->send_size + omtu))
8194 					mtu -= (chk->send_size + omtu);
8195 				else
8196 					mtu = 0;
8197 				to_out += (chk->send_size + omtu);
8198 				/* Do clear IP_DF ? */
8199 				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8200 					no_fragmentflg = 0;
8201 				}
8202 				if (chk->rec.chunk_id.can_take_data)
8203 					chk->data = NULL;
8204 				/*
8205 				 * set hb flag since we can use these for
8206 				 * RTO
8207 				 */
8208 				hbflag = 1;
8209 				asconf = 1;
8210 				/*
8211 				 * should sysctl this: don't bundle data
8212 				 * with ASCONF since it requires AUTH
8213 				 */
8214 				no_data_chunks = 1;
8215 				chk->sent = SCTP_DATAGRAM_SENT;
8216 				if (chk->whoTo == NULL) {
8217 					chk->whoTo = net;
8218 					atomic_add_int(&net->ref_count, 1);
8219 				}
8220 				chk->snd_count++;
8221 				if (mtu == 0) {
8222 					/*
8223 					 * Ok we are out of room but we can
8224 					 * output without effecting the
8225 					 * flight size since this little guy
8226 					 * is a control only packet.
8227 					 */
8228 					sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8229 					/*
8230 					 * do NOT clear the asconf flag as
8231 					 * it is used to do appropriate
8232 					 * source address selection.
8233 					 */
8234 					if (*now_filled == 0) {
8235 						(void)SCTP_GETTIME_TIMEVAL(now);
8236 						*now_filled = 1;
8237 					}
8238 					net->last_sent_time = *now;
8239 					hbflag = 0;
8240 					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8241 					    (struct sockaddr *)&net->ro._l_addr,
8242 					    outchain, auth_offset, auth,
8243 					    stcb->asoc.authinfo.active_keyid,
8244 					    no_fragmentflg, 0, asconf,
8245 					    inp->sctp_lport, stcb->rport,
8246 					    htonl(stcb->asoc.peer_vtag),
8247 					    net->port, NULL,
8248 					    0, 0,
8249 					    so_locked))) {
8250 						/*
8251 						 * error, we could not
8252 						 * output
8253 						 */
8254 						SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8255 						if (from_where == 0) {
8256 							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8257 						}
8258 						if (error == ENOBUFS) {
8259 							asoc->ifp_had_enobuf = 1;
8260 							SCTP_STAT_INCR(sctps_lowlevelerr);
8261 						}
8262 						/* error, could not output */
8263 						if (error == EHOSTUNREACH) {
8264 							/*
8265 							 * Destination went
8266 							 * unreachable
8267 							 * during this send
8268 							 */
8269 							sctp_move_chunks_from_net(stcb, net);
8270 						}
8271 						*reason_code = 7;
8272 						break;
8273 					} else {
8274 						asoc->ifp_had_enobuf = 0;
8275 					}
8276 					/*
8277 					 * increase the number we sent, if a
8278 					 * cookie is sent we don't tell them
8279 					 * any was sent out.
8280 					 */
8281 					outchain = endoutchain = NULL;
8282 					auth = NULL;
8283 					auth_offset = 0;
8284 					if (!no_out_cnt)
8285 						*num_out += ctl_cnt;
8286 					/* recalc a clean slate and setup */
8287 					switch (net->ro._l_addr.sa.sa_family) {
8288 #ifdef INET
8289 					case AF_INET:
8290 						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8291 						break;
8292 #endif
8293 #ifdef INET6
8294 					case AF_INET6:
8295 						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8296 						break;
8297 #endif
8298 					default:
8299 						/* TSNH */
8300 						mtu = net->mtu;
8301 						break;
8302 					}
8303 					to_out = 0;
8304 					no_fragmentflg = 1;
8305 				}
8306 			}
8307 		}
8308 		if (error != 0) {
8309 			/* try next net */
8310 			continue;
8311 		}
8312 		/************************/
8313 		/* Control transmission */
8314 		/************************/
8315 		/* Now first lets go through the control queue */
8316 		TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8317 			if ((sack_goes_to) &&
8318 			    (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8319 			    (chk->whoTo != sack_goes_to)) {
8320 				/*
8321 				 * if we have a sack in queue, and we are
8322 				 * looking at an ecn echo that is NOT queued
8323 				 * to where the sack is going..
8324 				 */
8325 				if (chk->whoTo == net) {
8326 					/*
8327 					 * Don't transmit it to where its
8328 					 * going (current net)
8329 					 */
8330 					continue;
8331 				} else if (sack_goes_to == net) {
8332 					/*
8333 					 * But do transmit it to this
8334 					 * address
8335 					 */
8336 					goto skip_net_check;
8337 				}
8338 			}
8339 			if (chk->whoTo == NULL) {
8340 				if (asoc->alternate == NULL) {
8341 					if (asoc->primary_destination != net) {
8342 						continue;
8343 					}
8344 				} else {
8345 					if (asoc->alternate != net) {
8346 						continue;
8347 					}
8348 				}
8349 			} else {
8350 				if (chk->whoTo != net) {
8351 					continue;
8352 				}
8353 			}
8354 	skip_net_check:
8355 			if (chk->data == NULL) {
8356 				continue;
8357 			}
8358 			if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8359 				/*
8360 				 * It must be unsent. Cookies and ASCONF's
8361 				 * hang around but there timers will force
8362 				 * when marked for resend.
8363 				 */
8364 				continue;
8365 			}
8366 			/*
8367 			 * if no AUTH is yet included and this chunk
8368 			 * requires it, make sure to account for it.  We
8369 			 * don't apply the size until the AUTH chunk is
8370 			 * actually added below in case there is no room for
8371 			 * this chunk. NOTE: we overload the use of "omtu"
8372 			 * here
8373 			 */
8374 			if ((auth == NULL) &&
8375 			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8376 			    stcb->asoc.peer_auth_chunks)) {
8377 				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8378 			} else
8379 				omtu = 0;
8380 			/* Here we do NOT factor the r_mtu */
8381 			if ((chk->send_size <= (int)(mtu - omtu)) ||
8382 			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8383 				/*
8384 				 * We probably should glom the mbuf chain
8385 				 * from the chk->data for control but the
8386 				 * problem is it becomes yet one more level
8387 				 * of tracking to do if for some reason
8388 				 * output fails. Then I have got to
8389 				 * reconstruct the merged control chain.. el
8390 				 * yucko.. for now we take the easy way and
8391 				 * do the copy
8392 				 */
8393 				/*
8394 				 * Add an AUTH chunk, if chunk requires it
8395 				 * save the offset into the chain for AUTH
8396 				 */
8397 				if ((auth == NULL) &&
8398 				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8399 				    stcb->asoc.peer_auth_chunks))) {
8400 					outchain = sctp_add_auth_chunk(outchain,
8401 					    &endoutchain,
8402 					    &auth,
8403 					    &auth_offset,
8404 					    stcb,
8405 					    chk->rec.chunk_id.id);
8406 					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8407 				}
8408 				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8409 				    (int)chk->rec.chunk_id.can_take_data,
8410 				    chk->send_size, chk->copy_by_ref);
8411 				if (outchain == NULL) {
8412 					*reason_code = 8;
8413 					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8414 					return (ENOMEM);
8415 				}
8416 				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8417 				/* update our MTU size */
8418 				if (mtu > (chk->send_size + omtu))
8419 					mtu -= (chk->send_size + omtu);
8420 				else
8421 					mtu = 0;
8422 				to_out += (chk->send_size + omtu);
8423 				/* Do clear IP_DF ? */
8424 				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8425 					no_fragmentflg = 0;
8426 				}
8427 				if (chk->rec.chunk_id.can_take_data)
8428 					chk->data = NULL;
8429 				/* Mark things to be removed, if needed */
8430 				if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8431 				    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
8432 				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8433 				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8434 				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8435 				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8436 				    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8437 				    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8438 				    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8439 				    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8440 				    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8441 					if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8442 						hbflag = 1;
8443 					}
8444 					/* remove these chunks at the end */
8445 					if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8446 					    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8447 						/* turn off the timer */
8448 						if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8449 							sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8450 							    inp, stcb, net,
8451 							    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8452 						}
8453 					}
8454 					ctl_cnt++;
8455 				} else {
8456 					/*
8457 					 * Other chunks, since they have
8458 					 * timers running (i.e. COOKIE) we
8459 					 * just "trust" that it gets sent or
8460 					 * retransmitted.
8461 					 */
8462 					ctl_cnt++;
8463 					if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8464 						cookie = 1;
8465 						no_out_cnt = 1;
8466 					} else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8467 						/*
8468 						 * Increment ecne send count
8469 						 * here this means we may be
8470 						 * over-zealous in our
8471 						 * counting if the send
8472 						 * fails, but its the best
8473 						 * place to do it (we used
8474 						 * to do it in the queue of
8475 						 * the chunk, but that did
8476 						 * not tell how many times
8477 						 * it was sent.
8478 						 */
8479 						SCTP_STAT_INCR(sctps_sendecne);
8480 					}
8481 					chk->sent = SCTP_DATAGRAM_SENT;
8482 					if (chk->whoTo == NULL) {
8483 						chk->whoTo = net;
8484 						atomic_add_int(&net->ref_count, 1);
8485 					}
8486 					chk->snd_count++;
8487 				}
8488 				if (mtu == 0) {
8489 					/*
8490 					 * Ok we are out of room but we can
8491 					 * output without effecting the
8492 					 * flight size since this little guy
8493 					 * is a control only packet.
8494 					 */
8495 					if (asconf) {
8496 						sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8497 						/*
8498 						 * do NOT clear the asconf
8499 						 * flag as it is used to do
8500 						 * appropriate source
8501 						 * address selection.
8502 						 */
8503 					}
8504 					if (cookie) {
8505 						sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8506 						cookie = 0;
8507 					}
8508 					/* Only HB or ASCONF advances time */
8509 					if (hbflag) {
8510 						if (*now_filled == 0) {
8511 							(void)SCTP_GETTIME_TIMEVAL(now);
8512 							*now_filled = 1;
8513 						}
8514 						net->last_sent_time = *now;
8515 						hbflag = 0;
8516 					}
8517 					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8518 					    (struct sockaddr *)&net->ro._l_addr,
8519 					    outchain,
8520 					    auth_offset, auth,
8521 					    stcb->asoc.authinfo.active_keyid,
8522 					    no_fragmentflg, 0, asconf,
8523 					    inp->sctp_lport, stcb->rport,
8524 					    htonl(stcb->asoc.peer_vtag),
8525 					    net->port, NULL,
8526 					    0, 0,
8527 					    so_locked))) {
8528 						/*
8529 						 * error, we could not
8530 						 * output
8531 						 */
8532 						SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8533 						if (from_where == 0) {
8534 							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8535 						}
8536 						if (error == ENOBUFS) {
8537 							asoc->ifp_had_enobuf = 1;
8538 							SCTP_STAT_INCR(sctps_lowlevelerr);
8539 						}
8540 						if (error == EHOSTUNREACH) {
8541 							/*
8542 							 * Destination went
8543 							 * unreachable
8544 							 * during this send
8545 							 */
8546 							sctp_move_chunks_from_net(stcb, net);
8547 						}
8548 						*reason_code = 7;
8549 						break;
8550 					} else {
8551 						asoc->ifp_had_enobuf = 0;
8552 					}
8553 					/*
8554 					 * increase the number we sent, if a
8555 					 * cookie is sent we don't tell them
8556 					 * any was sent out.
8557 					 */
8558 					outchain = endoutchain = NULL;
8559 					auth = NULL;
8560 					auth_offset = 0;
8561 					if (!no_out_cnt)
8562 						*num_out += ctl_cnt;
8563 					/* recalc a clean slate and setup */
8564 					switch (net->ro._l_addr.sa.sa_family) {
8565 #ifdef INET
8566 					case AF_INET:
8567 						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8568 						break;
8569 #endif
8570 #ifdef INET6
8571 					case AF_INET6:
8572 						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8573 						break;
8574 #endif
8575 					default:
8576 						/* TSNH */
8577 						mtu = net->mtu;
8578 						break;
8579 					}
8580 					to_out = 0;
8581 					no_fragmentflg = 1;
8582 				}
8583 			}
8584 		}
8585 		if (error != 0) {
8586 			/* try next net */
8587 			continue;
8588 		}
8589 		/* JRI: if dest is in PF state, do not send data to it */
8590 		if ((asoc->sctp_cmt_on_off > 0) &&
8591 		    (net != stcb->asoc.alternate) &&
8592 		    (net->dest_state & SCTP_ADDR_PF)) {
8593 			goto no_data_fill;
8594 		}
8595 		if (net->flight_size >= net->cwnd) {
8596 			goto no_data_fill;
8597 		}
8598 		if ((asoc->sctp_cmt_on_off > 0) &&
8599 		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8600 		    (net->flight_size > max_rwnd_per_dest)) {
8601 			goto no_data_fill;
8602 		}
8603 		/*
8604 		 * We need a specific accounting for the usage of the send
8605 		 * buffer. We also need to check the number of messages per
8606 		 * net. For now, this is better than nothing and it disabled
8607 		 * by default...
8608 		 */
8609 		if ((asoc->sctp_cmt_on_off > 0) &&
8610 		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8611 		    (max_send_per_dest > 0) &&
8612 		    (net->flight_size > max_send_per_dest)) {
8613 			goto no_data_fill;
8614 		}
8615 		/*********************/
8616 		/* Data transmission */
8617 		/*********************/
8618 		/*
8619 		 * if AUTH for DATA is required and no AUTH has been added
8620 		 * yet, account for this in the mtu now... if no data can be
8621 		 * bundled, this adjustment won't matter anyways since the
8622 		 * packet will be going out...
8623 		 */
8624 		data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8625 		    stcb->asoc.peer_auth_chunks);
8626 		if (data_auth_reqd && (auth == NULL)) {
8627 			mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8628 		}
8629 		/* now lets add any data within the MTU constraints */
8630 		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8631 #ifdef INET
8632 		case AF_INET:
8633 			if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8634 				omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8635 			else
8636 				omtu = 0;
8637 			break;
8638 #endif
8639 #ifdef INET6
8640 		case AF_INET6:
8641 			if (net->mtu > SCTP_MIN_OVERHEAD)
8642 				omtu = net->mtu - SCTP_MIN_OVERHEAD;
8643 			else
8644 				omtu = 0;
8645 			break;
8646 #endif
8647 		default:
8648 			/* TSNH */
8649 			omtu = 0;
8650 			break;
8651 		}
8652 		if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
8653 		    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8654 		    (skip_data_for_this_net == 0)) ||
8655 		    (cookie)) {
8656 			TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8657 				if (no_data_chunks) {
8658 					/* let only control go out */
8659 					*reason_code = 1;
8660 					break;
8661 				}
8662 				if (net->flight_size >= net->cwnd) {
8663 					/* skip this net, no room for data */
8664 					*reason_code = 2;
8665 					break;
8666 				}
8667 				if ((chk->whoTo != NULL) &&
8668 				    (chk->whoTo != net)) {
8669 					/* Don't send the chunk on this net */
8670 					continue;
8671 				}
8672 
8673 				if (asoc->sctp_cmt_on_off == 0) {
8674 					if ((asoc->alternate) &&
8675 					    (asoc->alternate != net) &&
8676 					    (chk->whoTo == NULL)) {
8677 						continue;
8678 					} else if ((net != asoc->primary_destination) &&
8679 						    (asoc->alternate == NULL) &&
8680 					    (chk->whoTo == NULL)) {
8681 						continue;
8682 					}
8683 				}
8684 				if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8685 					/*-
8686 					 * strange, we have a chunk that is
8687 					 * to big for its destination and
8688 					 * yet no fragment ok flag.
8689 					 * Something went wrong when the
8690 					 * PMTU changed...we did not mark
8691 					 * this chunk for some reason?? I
8692 					 * will fix it here by letting IP
8693 					 * fragment it for now and printing
8694 					 * a warning. This really should not
8695 					 * happen ...
8696 					 */
8697 					SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8698 					    chk->send_size, mtu);
8699 					chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8700 				}
8701 				if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8702 				    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
8703 					struct sctp_data_chunk *dchkh;
8704 
8705 					dchkh = mtod(chk->data, struct sctp_data_chunk *);
8706 					dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8707 				}
8708 				if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8709 				    ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8710 					/* ok we will add this one */
8711 
8712 					/*
8713 					 * Add an AUTH chunk, if chunk
8714 					 * requires it, save the offset into
8715 					 * the chain for AUTH
8716 					 */
8717 					if (data_auth_reqd) {
8718 						if (auth == NULL) {
8719 							outchain = sctp_add_auth_chunk(outchain,
8720 							    &endoutchain,
8721 							    &auth,
8722 							    &auth_offset,
8723 							    stcb,
8724 							    SCTP_DATA);
8725 							auth_keyid = chk->auth_keyid;
8726 							override_ok = 0;
8727 							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8728 						} else if (override_ok) {
8729 							/*
8730 							 * use this data's
8731 							 * keyid
8732 							 */
8733 							auth_keyid = chk->auth_keyid;
8734 							override_ok = 0;
8735 						} else if (auth_keyid != chk->auth_keyid) {
8736 							/*
8737 							 * different keyid,
8738 							 * so done bundling
8739 							 */
8740 							break;
8741 						}
8742 					}
8743 					outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8744 					    chk->send_size, chk->copy_by_ref);
8745 					if (outchain == NULL) {
8746 						SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8747 						if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8748 							sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8749 						}
8750 						*reason_code = 3;
8751 						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8752 						return (ENOMEM);
8753 					}
8754 					/* upate our MTU size */
8755 					/* Do clear IP_DF ? */
8756 					if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8757 						no_fragmentflg = 0;
8758 					}
8759 					/* unsigned subtraction of mtu */
8760 					if (mtu > chk->send_size)
8761 						mtu -= chk->send_size;
8762 					else
8763 						mtu = 0;
8764 					/* unsigned subtraction of r_mtu */
8765 					if (r_mtu > chk->send_size)
8766 						r_mtu -= chk->send_size;
8767 					else
8768 						r_mtu = 0;
8769 
8770 					to_out += chk->send_size;
8771 					if ((to_out > mx_mtu) && no_fragmentflg) {
8772 #ifdef INVARIANTS
8773 						panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8774 #else
8775 						SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8776 						    mx_mtu, to_out);
8777 #endif
8778 					}
8779 					chk->window_probe = 0;
8780 					data_list[bundle_at++] = chk;
8781 					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8782 						break;
8783 					}
8784 					if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8785 						if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8786 							SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8787 						} else {
8788 							SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8789 						}
8790 						if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8791 						    ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8792 							/*
8793 							 * Count number of
8794 							 * user msg's that
8795 							 * were fragmented
8796 							 * we do this by
8797 							 * counting when we
8798 							 * see a LAST
8799 							 * fragment only.
8800 							 */
8801 							SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8802 					}
8803 					if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8804 						if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8805 							data_list[0]->window_probe = 1;
8806 							net->window_probe = 1;
8807 						}
8808 						break;
8809 					}
8810 				} else {
8811 					/*
8812 					 * Must be sent in order of the
8813 					 * TSN's (on a network)
8814 					 */
8815 					break;
8816 				}
8817 			}	/* for (chunk gather loop for this net) */
8818 		}		/* if asoc.state OPEN */
8819 no_data_fill:
8820 		/* Is there something to send for this destination? */
8821 		if (outchain) {
8822 			/* We may need to start a control timer or two */
8823 			if (asconf) {
8824 				sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8825 				    stcb, net);
8826 				/*
8827 				 * do NOT clear the asconf flag as it is
8828 				 * used to do appropriate source address
8829 				 * selection.
8830 				 */
8831 			}
8832 			if (cookie) {
8833 				sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8834 				cookie = 0;
8835 			}
8836 			/* must start a send timer if data is being sent */
8837 			if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8838 				/*
8839 				 * no timer running on this destination
8840 				 * restart it.
8841 				 */
8842 				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8843 			}
8844 			if (bundle_at || hbflag) {
8845 				/* For data/asconf and hb set time */
8846 				if (*now_filled == 0) {
8847 					(void)SCTP_GETTIME_TIMEVAL(now);
8848 					*now_filled = 1;
8849 				}
8850 				net->last_sent_time = *now;
8851 			}
8852 			/* Now send it, if there is anything to send :> */
8853 			if ((error = sctp_lowlevel_chunk_output(inp,
8854 			    stcb,
8855 			    net,
8856 			    (struct sockaddr *)&net->ro._l_addr,
8857 			    outchain,
8858 			    auth_offset,
8859 			    auth,
8860 			    auth_keyid,
8861 			    no_fragmentflg,
8862 			    bundle_at,
8863 			    asconf,
8864 			    inp->sctp_lport, stcb->rport,
8865 			    htonl(stcb->asoc.peer_vtag),
8866 			    net->port, NULL,
8867 			    0, 0,
8868 			    so_locked))) {
8869 				/* error, we could not output */
8870 				SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8871 				if (from_where == 0) {
8872 					SCTP_STAT_INCR(sctps_lowlevelerrusr);
8873 				}
8874 				if (error == ENOBUFS) {
8875 					asoc->ifp_had_enobuf = 1;
8876 					SCTP_STAT_INCR(sctps_lowlevelerr);
8877 				}
8878 				if (error == EHOSTUNREACH) {
8879 					/*
8880 					 * Destination went unreachable
8881 					 * during this send
8882 					 */
8883 					sctp_move_chunks_from_net(stcb, net);
8884 				}
8885 				*reason_code = 6;
8886 				/*-
8887 				 * I add this line to be paranoid. As far as
8888 				 * I can tell the continue, takes us back to
8889 				 * the top of the for, but just to make sure
8890 				 * I will reset these again here.
8891 				 */
8892 				ctl_cnt = bundle_at = 0;
8893 				continue;	/* This takes us back to the
8894 						 * for() for the nets. */
8895 			} else {
8896 				asoc->ifp_had_enobuf = 0;
8897 			}
8898 			endoutchain = NULL;
8899 			auth = NULL;
8900 			auth_offset = 0;
8901 			if (!no_out_cnt) {
8902 				*num_out += (ctl_cnt + bundle_at);
8903 			}
8904 			if (bundle_at) {
8905 				/* setup for a RTO measurement */
8906 				tsns_sent = data_list[0]->rec.data.tsn;
8907 				/* fill time if not already filled */
8908 				if (*now_filled == 0) {
8909 					(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8910 					*now_filled = 1;
8911 					*now = asoc->time_last_sent;
8912 				} else {
8913 					asoc->time_last_sent = *now;
8914 				}
8915 				if (net->rto_needed) {
8916 					data_list[0]->do_rtt = 1;
8917 					net->rto_needed = 0;
8918 				}
8919 				SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8920 				sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8921 			}
8922 			if (one_chunk) {
8923 				break;
8924 			}
8925 		}
8926 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8927 			sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8928 		}
8929 	}
8930 	if (old_start_at == NULL) {
8931 		old_start_at = start_at;
8932 		start_at = TAILQ_FIRST(&asoc->nets);
8933 		if (old_start_at)
8934 			goto again_one_more_time;
8935 	}
8936 
8937 	/*
8938 	 * At the end there should be no NON timed chunks hanging on this
8939 	 * queue.
8940 	 */
8941 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8942 		sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8943 	}
8944 	if ((*num_out == 0) && (*reason_code == 0)) {
8945 		*reason_code = 4;
8946 	} else {
8947 		*reason_code = 5;
8948 	}
8949 	sctp_clean_up_ctl(stcb, asoc, so_locked);
8950 	return (0);
8951 }
8952 
8953 void
8954 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8955 {
8956 	/*-
8957 	 * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8958 	 * the control chunk queue.
8959 	 */
8960 	struct sctp_chunkhdr *hdr;
8961 	struct sctp_tmit_chunk *chk;
8962 	struct mbuf *mat, *last_mbuf;
8963 	uint32_t chunk_length;
8964 	uint16_t padding_length;
8965 
8966 	SCTP_TCB_LOCK_ASSERT(stcb);
8967 	SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8968 	if (op_err == NULL) {
8969 		return;
8970 	}
8971 	last_mbuf = NULL;
8972 	chunk_length = 0;
8973 	for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8974 		chunk_length += SCTP_BUF_LEN(mat);
8975 		if (SCTP_BUF_NEXT(mat) == NULL) {
8976 			last_mbuf = mat;
8977 		}
8978 	}
8979 	if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8980 		sctp_m_freem(op_err);
8981 		return;
8982 	}
8983 	padding_length = chunk_length % 4;
8984 	if (padding_length != 0) {
8985 		padding_length = 4 - padding_length;
8986 	}
8987 	if (padding_length != 0) {
8988 		if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8989 			sctp_m_freem(op_err);
8990 			return;
8991 		}
8992 	}
8993 	sctp_alloc_a_chunk(stcb, chk);
8994 	if (chk == NULL) {
8995 		/* no memory */
8996 		sctp_m_freem(op_err);
8997 		return;
8998 	}
8999 	chk->copy_by_ref = 0;
9000 	chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
9001 	chk->rec.chunk_id.can_take_data = 0;
9002 	chk->flags = 0;
9003 	chk->send_size = (uint16_t)chunk_length;
9004 	chk->sent = SCTP_DATAGRAM_UNSENT;
9005 	chk->snd_count = 0;
9006 	chk->asoc = &stcb->asoc;
9007 	chk->data = op_err;
9008 	chk->whoTo = NULL;
9009 	hdr = mtod(op_err, struct sctp_chunkhdr *);
9010 	hdr->chunk_type = SCTP_OPERATION_ERROR;
9011 	hdr->chunk_flags = 0;
9012 	hdr->chunk_length = htons(chk->send_size);
9013 	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9014 	chk->asoc->ctrl_queue_cnt++;
9015 }
9016 
9017 int
9018 sctp_send_cookie_echo(struct mbuf *m,
9019     int offset, int limit,
9020     struct sctp_tcb *stcb,
9021     struct sctp_nets *net)
9022 {
9023 	/*-
9024 	 * pull out the cookie and put it at the front of the control chunk
9025 	 * queue.
9026 	 */
9027 	int at;
9028 	struct mbuf *cookie;
9029 	struct sctp_paramhdr param, *phdr;
9030 	struct sctp_chunkhdr *hdr;
9031 	struct sctp_tmit_chunk *chk;
9032 	uint16_t ptype, plen;
9033 
9034 	SCTP_TCB_LOCK_ASSERT(stcb);
9035 	/* First find the cookie in the param area */
9036 	cookie = NULL;
9037 	at = offset + sizeof(struct sctp_init_chunk);
9038 	for (;;) {
9039 		phdr = sctp_get_next_param(m, at, &param, sizeof(param));
9040 		if (phdr == NULL) {
9041 			return (-3);
9042 		}
9043 		ptype = ntohs(phdr->param_type);
9044 		plen = ntohs(phdr->param_length);
9045 		if (plen < sizeof(struct sctp_paramhdr)) {
9046 			return (-6);
9047 		}
9048 		if (ptype == SCTP_STATE_COOKIE) {
9049 			int pad;
9050 
9051 			/* found the cookie */
9052 			if (at + plen > limit) {
9053 				return (-7);
9054 			}
9055 			cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9056 			if (cookie == NULL) {
9057 				/* No memory */
9058 				return (-2);
9059 			}
9060 			if ((pad = (plen % 4)) > 0) {
9061 				pad = 4 - pad;
9062 			}
9063 			if (pad > 0) {
9064 				if (sctp_pad_lastmbuf(cookie, pad, NULL) == NULL) {
9065 					return (-8);
9066 				}
9067 			}
9068 #ifdef SCTP_MBUF_LOGGING
9069 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9070 				sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9071 			}
9072 #endif
9073 			break;
9074 		}
9075 		at += SCTP_SIZE32(plen);
9076 	}
9077 	/* ok, we got the cookie lets change it into a cookie echo chunk */
9078 	/* first the change from param to cookie */
9079 	hdr = mtod(cookie, struct sctp_chunkhdr *);
9080 	hdr->chunk_type = SCTP_COOKIE_ECHO;
9081 	hdr->chunk_flags = 0;
9082 	/* get the chunk stuff now and place it in the FRONT of the queue */
9083 	sctp_alloc_a_chunk(stcb, chk);
9084 	if (chk == NULL) {
9085 		/* no memory */
9086 		sctp_m_freem(cookie);
9087 		return (-5);
9088 	}
9089 	chk->copy_by_ref = 0;
9090 	chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9091 	chk->rec.chunk_id.can_take_data = 0;
9092 	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9093 	chk->send_size = SCTP_SIZE32(plen);
9094 	chk->sent = SCTP_DATAGRAM_UNSENT;
9095 	chk->snd_count = 0;
9096 	chk->asoc = &stcb->asoc;
9097 	chk->data = cookie;
9098 	chk->whoTo = net;
9099 	atomic_add_int(&chk->whoTo->ref_count, 1);
9100 	TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9101 	chk->asoc->ctrl_queue_cnt++;
9102 	return (0);
9103 }
9104 
9105 void
9106 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9107     struct mbuf *m,
9108     int offset,
9109     int chk_length,
9110     struct sctp_nets *net)
9111 {
9112 	/*
9113 	 * take a HB request and make it into a HB ack and send it.
9114 	 */
9115 	struct mbuf *outchain;
9116 	struct sctp_chunkhdr *chdr;
9117 	struct sctp_tmit_chunk *chk;
9118 
9119 	if (net == NULL)
9120 		/* must have a net pointer */
9121 		return;
9122 
9123 	outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9124 	if (outchain == NULL) {
9125 		/* gak out of memory */
9126 		return;
9127 	}
9128 #ifdef SCTP_MBUF_LOGGING
9129 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9130 		sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9131 	}
9132 #endif
9133 	chdr = mtod(outchain, struct sctp_chunkhdr *);
9134 	chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9135 	chdr->chunk_flags = 0;
9136 	if (chk_length % 4 != 0) {
9137 		sctp_pad_lastmbuf(outchain, 4 - (chk_length % 4), NULL);
9138 	}
9139 	sctp_alloc_a_chunk(stcb, chk);
9140 	if (chk == NULL) {
9141 		/* no memory */
9142 		sctp_m_freem(outchain);
9143 		return;
9144 	}
9145 	chk->copy_by_ref = 0;
9146 	chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9147 	chk->rec.chunk_id.can_take_data = 1;
9148 	chk->flags = 0;
9149 	chk->send_size = chk_length;
9150 	chk->sent = SCTP_DATAGRAM_UNSENT;
9151 	chk->snd_count = 0;
9152 	chk->asoc = &stcb->asoc;
9153 	chk->data = outchain;
9154 	chk->whoTo = net;
9155 	atomic_add_int(&chk->whoTo->ref_count, 1);
9156 	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9157 	chk->asoc->ctrl_queue_cnt++;
9158 }
9159 
9160 void
9161 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9162 {
9163 	/* formulate and queue a cookie-ack back to sender */
9164 	struct mbuf *cookie_ack;
9165 	struct sctp_chunkhdr *hdr;
9166 	struct sctp_tmit_chunk *chk;
9167 
9168 	SCTP_TCB_LOCK_ASSERT(stcb);
9169 
9170 	cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9171 	if (cookie_ack == NULL) {
9172 		/* no mbuf's */
9173 		return;
9174 	}
9175 	SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9176 	sctp_alloc_a_chunk(stcb, chk);
9177 	if (chk == NULL) {
9178 		/* no memory */
9179 		sctp_m_freem(cookie_ack);
9180 		return;
9181 	}
9182 	chk->copy_by_ref = 0;
9183 	chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9184 	chk->rec.chunk_id.can_take_data = 1;
9185 	chk->flags = 0;
9186 	chk->send_size = sizeof(struct sctp_chunkhdr);
9187 	chk->sent = SCTP_DATAGRAM_UNSENT;
9188 	chk->snd_count = 0;
9189 	chk->asoc = &stcb->asoc;
9190 	chk->data = cookie_ack;
9191 	if (chk->asoc->last_control_chunk_from != NULL) {
9192 		chk->whoTo = chk->asoc->last_control_chunk_from;
9193 		atomic_add_int(&chk->whoTo->ref_count, 1);
9194 	} else {
9195 		chk->whoTo = NULL;
9196 	}
9197 	hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9198 	hdr->chunk_type = SCTP_COOKIE_ACK;
9199 	hdr->chunk_flags = 0;
9200 	hdr->chunk_length = htons(chk->send_size);
9201 	SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9202 	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9203 	chk->asoc->ctrl_queue_cnt++;
9204 	return;
9205 }
9206 
9207 
9208 void
9209 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9210 {
9211 	/* formulate and queue a SHUTDOWN-ACK back to the sender */
9212 	struct mbuf *m_shutdown_ack;
9213 	struct sctp_shutdown_ack_chunk *ack_cp;
9214 	struct sctp_tmit_chunk *chk;
9215 
9216 	m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9217 	if (m_shutdown_ack == NULL) {
9218 		/* no mbuf's */
9219 		return;
9220 	}
9221 	SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9222 	sctp_alloc_a_chunk(stcb, chk);
9223 	if (chk == NULL) {
9224 		/* no memory */
9225 		sctp_m_freem(m_shutdown_ack);
9226 		return;
9227 	}
9228 	chk->copy_by_ref = 0;
9229 	chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9230 	chk->rec.chunk_id.can_take_data = 1;
9231 	chk->flags = 0;
9232 	chk->send_size = sizeof(struct sctp_chunkhdr);
9233 	chk->sent = SCTP_DATAGRAM_UNSENT;
9234 	chk->snd_count = 0;
9235 	chk->asoc = &stcb->asoc;
9236 	chk->data = m_shutdown_ack;
9237 	chk->whoTo = net;
9238 	if (chk->whoTo) {
9239 		atomic_add_int(&chk->whoTo->ref_count, 1);
9240 	}
9241 	ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9242 	ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9243 	ack_cp->ch.chunk_flags = 0;
9244 	ack_cp->ch.chunk_length = htons(chk->send_size);
9245 	SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9246 	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9247 	chk->asoc->ctrl_queue_cnt++;
9248 	return;
9249 }
9250 
9251 void
9252 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9253 {
9254 	/* formulate and queue a SHUTDOWN to the sender */
9255 	struct mbuf *m_shutdown;
9256 	struct sctp_shutdown_chunk *shutdown_cp;
9257 	struct sctp_tmit_chunk *chk;
9258 
9259 	TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9260 		if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9261 			/* We already have a SHUTDOWN queued. Reuse it. */
9262 			if (chk->whoTo) {
9263 				sctp_free_remote_addr(chk->whoTo);
9264 				chk->whoTo = NULL;
9265 			}
9266 			break;
9267 		}
9268 	}
9269 	if (chk == NULL) {
9270 		m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9271 		if (m_shutdown == NULL) {
9272 			/* no mbuf's */
9273 			return;
9274 		}
9275 		SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9276 		sctp_alloc_a_chunk(stcb, chk);
9277 		if (chk == NULL) {
9278 			/* no memory */
9279 			sctp_m_freem(m_shutdown);
9280 			return;
9281 		}
9282 		chk->copy_by_ref = 0;
9283 		chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9284 		chk->rec.chunk_id.can_take_data = 1;
9285 		chk->flags = 0;
9286 		chk->send_size = sizeof(struct sctp_shutdown_chunk);
9287 		chk->sent = SCTP_DATAGRAM_UNSENT;
9288 		chk->snd_count = 0;
9289 		chk->asoc = &stcb->asoc;
9290 		chk->data = m_shutdown;
9291 		chk->whoTo = net;
9292 		if (chk->whoTo) {
9293 			atomic_add_int(&chk->whoTo->ref_count, 1);
9294 		}
9295 		shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9296 		shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9297 		shutdown_cp->ch.chunk_flags = 0;
9298 		shutdown_cp->ch.chunk_length = htons(chk->send_size);
9299 		shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9300 		SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9301 		TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9302 		chk->asoc->ctrl_queue_cnt++;
9303 	} else {
9304 		TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9305 		chk->whoTo = net;
9306 		if (chk->whoTo) {
9307 			atomic_add_int(&chk->whoTo->ref_count, 1);
9308 		}
9309 		shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9310 		shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9311 		TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9312 	}
9313 	return;
9314 }
9315 
9316 void
9317 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9318 {
9319 	/*
9320 	 * formulate and queue an ASCONF to the peer. ASCONF parameters
9321 	 * should be queued on the assoc queue.
9322 	 */
9323 	struct sctp_tmit_chunk *chk;
9324 	struct mbuf *m_asconf;
9325 	int len;
9326 
9327 	SCTP_TCB_LOCK_ASSERT(stcb);
9328 
9329 	if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9330 	    (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9331 		/* can't send a new one if there is one in flight already */
9332 		return;
9333 	}
9334 
9335 	/* compose an ASCONF chunk, maximum length is PMTU */
9336 	m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9337 	if (m_asconf == NULL) {
9338 		return;
9339 	}
9340 
9341 	sctp_alloc_a_chunk(stcb, chk);
9342 	if (chk == NULL) {
9343 		/* no memory */
9344 		sctp_m_freem(m_asconf);
9345 		return;
9346 	}
9347 
9348 	chk->copy_by_ref = 0;
9349 	chk->rec.chunk_id.id = SCTP_ASCONF;
9350 	chk->rec.chunk_id.can_take_data = 0;
9351 	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9352 	chk->data = m_asconf;
9353 	chk->send_size = len;
9354 	chk->sent = SCTP_DATAGRAM_UNSENT;
9355 	chk->snd_count = 0;
9356 	chk->asoc = &stcb->asoc;
9357 	chk->whoTo = net;
9358 	if (chk->whoTo) {
9359 		atomic_add_int(&chk->whoTo->ref_count, 1);
9360 	}
9361 	TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9362 	chk->asoc->ctrl_queue_cnt++;
9363 	return;
9364 }
9365 
9366 void
9367 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9368 {
9369 	/*
9370 	 * formulate and queue a asconf-ack back to sender. the asconf-ack
9371 	 * must be stored in the tcb.
9372 	 */
9373 	struct sctp_tmit_chunk *chk;
9374 	struct sctp_asconf_ack *ack, *latest_ack;
9375 	struct mbuf *m_ack;
9376 	struct sctp_nets *net = NULL;
9377 
9378 	SCTP_TCB_LOCK_ASSERT(stcb);
9379 	/* Get the latest ASCONF-ACK */
9380 	latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9381 	if (latest_ack == NULL) {
9382 		return;
9383 	}
9384 	if (latest_ack->last_sent_to != NULL &&
9385 	    latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9386 		/* we're doing a retransmission */
9387 		net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9388 		if (net == NULL) {
9389 			/* no alternate */
9390 			if (stcb->asoc.last_control_chunk_from == NULL) {
9391 				if (stcb->asoc.alternate) {
9392 					net = stcb->asoc.alternate;
9393 				} else {
9394 					net = stcb->asoc.primary_destination;
9395 				}
9396 			} else {
9397 				net = stcb->asoc.last_control_chunk_from;
9398 			}
9399 		}
9400 	} else {
9401 		/* normal case */
9402 		if (stcb->asoc.last_control_chunk_from == NULL) {
9403 			if (stcb->asoc.alternate) {
9404 				net = stcb->asoc.alternate;
9405 			} else {
9406 				net = stcb->asoc.primary_destination;
9407 			}
9408 		} else {
9409 			net = stcb->asoc.last_control_chunk_from;
9410 		}
9411 	}
9412 	latest_ack->last_sent_to = net;
9413 
9414 	TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9415 		if (ack->data == NULL) {
9416 			continue;
9417 		}
9418 
9419 		/* copy the asconf_ack */
9420 		m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9421 		if (m_ack == NULL) {
9422 			/* couldn't copy it */
9423 			return;
9424 		}
9425 #ifdef SCTP_MBUF_LOGGING
9426 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9427 			sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9428 		}
9429 #endif
9430 
9431 		sctp_alloc_a_chunk(stcb, chk);
9432 		if (chk == NULL) {
9433 			/* no memory */
9434 			if (m_ack)
9435 				sctp_m_freem(m_ack);
9436 			return;
9437 		}
9438 		chk->copy_by_ref = 0;
9439 		chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9440 		chk->rec.chunk_id.can_take_data = 1;
9441 		chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9442 		chk->whoTo = net;
9443 		if (chk->whoTo) {
9444 			atomic_add_int(&chk->whoTo->ref_count, 1);
9445 		}
9446 		chk->data = m_ack;
9447 		chk->send_size = ack->len;
9448 		chk->sent = SCTP_DATAGRAM_UNSENT;
9449 		chk->snd_count = 0;
9450 		chk->asoc = &stcb->asoc;
9451 
9452 		TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9453 		chk->asoc->ctrl_queue_cnt++;
9454 	}
9455 	return;
9456 }
9457 
9458 
9459 static int
9460 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9461     struct sctp_tcb *stcb,
9462     struct sctp_association *asoc,
9463     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9464 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9465     SCTP_UNUSED
9466 #endif
9467 )
9468 {
9469 	/*-
9470 	 * send out one MTU of retransmission. If fast_retransmit is
9471 	 * happening we ignore the cwnd. Otherwise we obey the cwnd and
9472 	 * rwnd. For a Cookie or Asconf in the control chunk queue we
9473 	 * retransmit them by themselves.
9474 	 *
9475 	 * For data chunks we will pick out the lowest TSN's in the sent_queue
9476 	 * marked for resend and bundle them all together (up to a MTU of
9477 	 * destination). The address to send to should have been
9478 	 * selected/changed where the retransmission was marked (i.e. in FR
9479 	 * or t3-timeout routines).
9480 	 */
9481 	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9482 	struct sctp_tmit_chunk *chk, *fwd;
9483 	struct mbuf *m, *endofchain;
9484 	struct sctp_nets *net = NULL;
9485 	uint32_t tsns_sent = 0;
9486 	int no_fragmentflg, bundle_at, cnt_thru;
9487 	unsigned int mtu;
9488 	int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9489 	struct sctp_auth_chunk *auth = NULL;
9490 	uint32_t auth_offset = 0;
9491 	uint16_t auth_keyid;
9492 	int override_ok = 1;
9493 	int data_auth_reqd = 0;
9494 	uint32_t dmtu = 0;
9495 
9496 	SCTP_TCB_LOCK_ASSERT(stcb);
9497 	tmr_started = ctl_cnt = bundle_at = error = 0;
9498 	no_fragmentflg = 1;
9499 	fwd_tsn = 0;
9500 	*cnt_out = 0;
9501 	fwd = NULL;
9502 	endofchain = m = NULL;
9503 	auth_keyid = stcb->asoc.authinfo.active_keyid;
9504 #ifdef SCTP_AUDITING_ENABLED
9505 	sctp_audit_log(0xC3, 1);
9506 #endif
9507 	if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9508 	    (TAILQ_EMPTY(&asoc->control_send_queue))) {
9509 		SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9510 		    asoc->sent_queue_retran_cnt);
9511 		asoc->sent_queue_cnt = 0;
9512 		asoc->sent_queue_cnt_removeable = 0;
9513 		/* send back 0/0 so we enter normal transmission */
9514 		*cnt_out = 0;
9515 		return (0);
9516 	}
9517 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9518 		if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9519 		    (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9520 		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9521 			if (chk->sent != SCTP_DATAGRAM_RESEND) {
9522 				continue;
9523 			}
9524 			if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9525 				if (chk != asoc->str_reset) {
9526 					/*
9527 					 * not eligible for retran if its
9528 					 * not ours
9529 					 */
9530 					continue;
9531 				}
9532 			}
9533 			ctl_cnt++;
9534 			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9535 				fwd_tsn = 1;
9536 			}
9537 			/*
9538 			 * Add an AUTH chunk, if chunk requires it save the
9539 			 * offset into the chain for AUTH
9540 			 */
9541 			if ((auth == NULL) &&
9542 			    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9543 			    stcb->asoc.peer_auth_chunks))) {
9544 				m = sctp_add_auth_chunk(m, &endofchain,
9545 				    &auth, &auth_offset,
9546 				    stcb,
9547 				    chk->rec.chunk_id.id);
9548 				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9549 			}
9550 			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9551 			break;
9552 		}
9553 	}
9554 	one_chunk = 0;
9555 	cnt_thru = 0;
9556 	/* do we have control chunks to retransmit? */
9557 	if (m != NULL) {
9558 		/* Start a timer no matter if we succeed or fail */
9559 		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9560 			sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9561 		} else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9562 			sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9563 		chk->snd_count++;	/* update our count */
9564 		if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9565 		    (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9566 		    auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9567 		    no_fragmentflg, 0, 0,
9568 		    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9569 		    chk->whoTo->port, NULL,
9570 		    0, 0,
9571 		    so_locked))) {
9572 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9573 			if (error == ENOBUFS) {
9574 				asoc->ifp_had_enobuf = 1;
9575 				SCTP_STAT_INCR(sctps_lowlevelerr);
9576 			}
9577 			return (error);
9578 		} else {
9579 			asoc->ifp_had_enobuf = 0;
9580 		}
9581 		endofchain = NULL;
9582 		auth = NULL;
9583 		auth_offset = 0;
9584 		/*
9585 		 * We don't want to mark the net->sent time here since this
9586 		 * we use this for HB and retrans cannot measure RTT
9587 		 */
9588 		/* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9589 		*cnt_out += 1;
9590 		chk->sent = SCTP_DATAGRAM_SENT;
9591 		sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9592 		if (fwd_tsn == 0) {
9593 			return (0);
9594 		} else {
9595 			/* Clean up the fwd-tsn list */
9596 			sctp_clean_up_ctl(stcb, asoc, so_locked);
9597 			return (0);
9598 		}
9599 	}
9600 	/*
9601 	 * Ok, it is just data retransmission we need to do or that and a
9602 	 * fwd-tsn with it all.
9603 	 */
9604 	if (TAILQ_EMPTY(&asoc->sent_queue)) {
9605 		return (SCTP_RETRAN_DONE);
9606 	}
9607 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
9608 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
9609 		/* not yet open, resend the cookie and that is it */
9610 		return (1);
9611 	}
9612 #ifdef SCTP_AUDITING_ENABLED
9613 	sctp_auditing(20, inp, stcb, NULL);
9614 #endif
9615 	data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9616 	TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9617 		if (chk->sent != SCTP_DATAGRAM_RESEND) {
9618 			/* No, not sent to this net or not ready for rtx */
9619 			continue;
9620 		}
9621 		if (chk->data == NULL) {
9622 			SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9623 			    chk->rec.data.tsn, chk->snd_count, chk->sent);
9624 			continue;
9625 		}
9626 		if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9627 		    (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9628 			struct mbuf *op_err;
9629 			char msg[SCTP_DIAG_INFO_LEN];
9630 
9631 			snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9632 			    chk->rec.data.tsn, chk->snd_count);
9633 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9634 			    msg);
9635 			atomic_add_int(&stcb->asoc.refcnt, 1);
9636 			sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9637 			    so_locked);
9638 			SCTP_TCB_LOCK(stcb);
9639 			atomic_subtract_int(&stcb->asoc.refcnt, 1);
9640 			return (SCTP_RETRAN_EXIT);
9641 		}
9642 		/* pick up the net */
9643 		net = chk->whoTo;
9644 		switch (net->ro._l_addr.sa.sa_family) {
9645 #ifdef INET
9646 		case AF_INET:
9647 			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9648 			break;
9649 #endif
9650 #ifdef INET6
9651 		case AF_INET6:
9652 			mtu = net->mtu - SCTP_MIN_OVERHEAD;
9653 			break;
9654 #endif
9655 		default:
9656 			/* TSNH */
9657 			mtu = net->mtu;
9658 			break;
9659 		}
9660 
9661 		if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9662 			/* No room in peers rwnd */
9663 			uint32_t tsn;
9664 
9665 			tsn = asoc->last_acked_seq + 1;
9666 			if (tsn == chk->rec.data.tsn) {
9667 				/*
9668 				 * we make a special exception for this
9669 				 * case. The peer has no rwnd but is missing
9670 				 * the lowest chunk.. which is probably what
9671 				 * is holding up the rwnd.
9672 				 */
9673 				goto one_chunk_around;
9674 			}
9675 			return (1);
9676 		}
9677 one_chunk_around:
9678 		if (asoc->peers_rwnd < mtu) {
9679 			one_chunk = 1;
9680 			if ((asoc->peers_rwnd == 0) &&
9681 			    (asoc->total_flight == 0)) {
9682 				chk->window_probe = 1;
9683 				chk->whoTo->window_probe = 1;
9684 			}
9685 		}
9686 #ifdef SCTP_AUDITING_ENABLED
9687 		sctp_audit_log(0xC3, 2);
9688 #endif
9689 		bundle_at = 0;
9690 		m = NULL;
9691 		net->fast_retran_ip = 0;
9692 		if (chk->rec.data.doing_fast_retransmit == 0) {
9693 			/*
9694 			 * if no FR in progress skip destination that have
9695 			 * flight_size > cwnd.
9696 			 */
9697 			if (net->flight_size >= net->cwnd) {
9698 				continue;
9699 			}
9700 		} else {
9701 			/*
9702 			 * Mark the destination net to have FR recovery
9703 			 * limits put on it.
9704 			 */
9705 			*fr_done = 1;
9706 			net->fast_retran_ip = 1;
9707 		}
9708 
9709 		/*
9710 		 * if no AUTH is yet included and this chunk requires it,
9711 		 * make sure to account for it.  We don't apply the size
9712 		 * until the AUTH chunk is actually added below in case
9713 		 * there is no room for this chunk.
9714 		 */
9715 		if (data_auth_reqd && (auth == NULL)) {
9716 			dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9717 		} else
9718 			dmtu = 0;
9719 
9720 		if ((chk->send_size <= (mtu - dmtu)) ||
9721 		    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9722 			/* ok we will add this one */
9723 			if (data_auth_reqd) {
9724 				if (auth == NULL) {
9725 					m = sctp_add_auth_chunk(m,
9726 					    &endofchain,
9727 					    &auth,
9728 					    &auth_offset,
9729 					    stcb,
9730 					    SCTP_DATA);
9731 					auth_keyid = chk->auth_keyid;
9732 					override_ok = 0;
9733 					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9734 				} else if (override_ok) {
9735 					auth_keyid = chk->auth_keyid;
9736 					override_ok = 0;
9737 				} else if (chk->auth_keyid != auth_keyid) {
9738 					/* different keyid, so done bundling */
9739 					break;
9740 				}
9741 			}
9742 			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9743 			if (m == NULL) {
9744 				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9745 				return (ENOMEM);
9746 			}
9747 			/* Do clear IP_DF ? */
9748 			if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9749 				no_fragmentflg = 0;
9750 			}
9751 			/* upate our MTU size */
9752 			if (mtu > (chk->send_size + dmtu))
9753 				mtu -= (chk->send_size + dmtu);
9754 			else
9755 				mtu = 0;
9756 			data_list[bundle_at++] = chk;
9757 			if (one_chunk && (asoc->total_flight <= 0)) {
9758 				SCTP_STAT_INCR(sctps_windowprobed);
9759 			}
9760 		}
9761 		if (one_chunk == 0) {
9762 			/*
9763 			 * now are there anymore forward from chk to pick
9764 			 * up?
9765 			 */
9766 			for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9767 				if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9768 					/* Nope, not for retran */
9769 					continue;
9770 				}
9771 				if (fwd->whoTo != net) {
9772 					/* Nope, not the net in question */
9773 					continue;
9774 				}
9775 				if (data_auth_reqd && (auth == NULL)) {
9776 					dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9777 				} else
9778 					dmtu = 0;
9779 				if (fwd->send_size <= (mtu - dmtu)) {
9780 					if (data_auth_reqd) {
9781 						if (auth == NULL) {
9782 							m = sctp_add_auth_chunk(m,
9783 							    &endofchain,
9784 							    &auth,
9785 							    &auth_offset,
9786 							    stcb,
9787 							    SCTP_DATA);
9788 							auth_keyid = fwd->auth_keyid;
9789 							override_ok = 0;
9790 							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9791 						} else if (override_ok) {
9792 							auth_keyid = fwd->auth_keyid;
9793 							override_ok = 0;
9794 						} else if (fwd->auth_keyid != auth_keyid) {
9795 							/*
9796 							 * different keyid,
9797 							 * so done bundling
9798 							 */
9799 							break;
9800 						}
9801 					}
9802 					m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9803 					if (m == NULL) {
9804 						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9805 						return (ENOMEM);
9806 					}
9807 					/* Do clear IP_DF ? */
9808 					if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9809 						no_fragmentflg = 0;
9810 					}
9811 					/* upate our MTU size */
9812 					if (mtu > (fwd->send_size + dmtu))
9813 						mtu -= (fwd->send_size + dmtu);
9814 					else
9815 						mtu = 0;
9816 					data_list[bundle_at++] = fwd;
9817 					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9818 						break;
9819 					}
9820 				} else {
9821 					/* can't fit so we are done */
9822 					break;
9823 				}
9824 			}
9825 		}
9826 		/* Is there something to send for this destination? */
9827 		if (m) {
9828 			/*
9829 			 * No matter if we fail/or succeed we should start a
9830 			 * timer. A failure is like a lost IP packet :-)
9831 			 */
9832 			if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9833 				/*
9834 				 * no timer running on this destination
9835 				 * restart it.
9836 				 */
9837 				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9838 				tmr_started = 1;
9839 			}
9840 			/* Now lets send it, if there is anything to send :> */
9841 			if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9842 			    (struct sockaddr *)&net->ro._l_addr, m,
9843 			    auth_offset, auth, auth_keyid,
9844 			    no_fragmentflg, 0, 0,
9845 			    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9846 			    net->port, NULL,
9847 			    0, 0,
9848 			    so_locked))) {
9849 				/* error, we could not output */
9850 				SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9851 				if (error == ENOBUFS) {
9852 					asoc->ifp_had_enobuf = 1;
9853 					SCTP_STAT_INCR(sctps_lowlevelerr);
9854 				}
9855 				return (error);
9856 			} else {
9857 				asoc->ifp_had_enobuf = 0;
9858 			}
9859 			endofchain = NULL;
9860 			auth = NULL;
9861 			auth_offset = 0;
9862 			/* For HB's */
9863 			/*
9864 			 * We don't want to mark the net->sent time here
9865 			 * since this we use this for HB and retrans cannot
9866 			 * measure RTT
9867 			 */
9868 			/* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9869 
9870 			/* For auto-close */
9871 			cnt_thru++;
9872 			if (*now_filled == 0) {
9873 				(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9874 				*now = asoc->time_last_sent;
9875 				*now_filled = 1;
9876 			} else {
9877 				asoc->time_last_sent = *now;
9878 			}
9879 			*cnt_out += bundle_at;
9880 #ifdef SCTP_AUDITING_ENABLED
9881 			sctp_audit_log(0xC4, bundle_at);
9882 #endif
9883 			if (bundle_at) {
9884 				tsns_sent = data_list[0]->rec.data.tsn;
9885 			}
9886 			for (i = 0; i < bundle_at; i++) {
9887 				SCTP_STAT_INCR(sctps_sendretransdata);
9888 				data_list[i]->sent = SCTP_DATAGRAM_SENT;
9889 				/*
9890 				 * When we have a revoked data, and we
9891 				 * retransmit it, then we clear the revoked
9892 				 * flag since this flag dictates if we
9893 				 * subtracted from the fs
9894 				 */
9895 				if (data_list[i]->rec.data.chunk_was_revoked) {
9896 					/* Deflate the cwnd */
9897 					data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9898 					data_list[i]->rec.data.chunk_was_revoked = 0;
9899 				}
9900 				data_list[i]->snd_count++;
9901 				sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9902 				/* record the time */
9903 				data_list[i]->sent_rcv_time = asoc->time_last_sent;
9904 				if (data_list[i]->book_size_scale) {
9905 					/*
9906 					 * need to double the book size on
9907 					 * this one
9908 					 */
9909 					data_list[i]->book_size_scale = 0;
9910 					/*
9911 					 * Since we double the booksize, we
9912 					 * must also double the output queue
9913 					 * size, since this get shrunk when
9914 					 * we free by this amount.
9915 					 */
9916 					atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9917 					data_list[i]->book_size *= 2;
9918 
9919 
9920 				} else {
9921 					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9922 						sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9923 						    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9924 					}
9925 					asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9926 					    (uint32_t)(data_list[i]->send_size +
9927 					    SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9928 				}
9929 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9930 					sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9931 					    data_list[i]->whoTo->flight_size,
9932 					    data_list[i]->book_size,
9933 					    (uint32_t)(uintptr_t)data_list[i]->whoTo,
9934 					    data_list[i]->rec.data.tsn);
9935 				}
9936 				sctp_flight_size_increase(data_list[i]);
9937 				sctp_total_flight_increase(stcb, data_list[i]);
9938 				if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9939 					/* SWS sender side engages */
9940 					asoc->peers_rwnd = 0;
9941 				}
9942 				if ((i == 0) &&
9943 				    (data_list[i]->rec.data.doing_fast_retransmit)) {
9944 					SCTP_STAT_INCR(sctps_sendfastretrans);
9945 					if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9946 					    (tmr_started == 0)) {
9947 						/*-
9948 						 * ok we just fast-retrans'd
9949 						 * the lowest TSN, i.e the
9950 						 * first on the list. In
9951 						 * this case we want to give
9952 						 * some more time to get a
9953 						 * SACK back without a
9954 						 * t3-expiring.
9955 						 */
9956 						sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9957 						    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9958 						sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9959 					}
9960 				}
9961 			}
9962 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9963 				sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9964 			}
9965 #ifdef SCTP_AUDITING_ENABLED
9966 			sctp_auditing(21, inp, stcb, NULL);
9967 #endif
9968 		} else {
9969 			/* None will fit */
9970 			return (1);
9971 		}
9972 		if (asoc->sent_queue_retran_cnt <= 0) {
9973 			/* all done we have no more to retran */
9974 			asoc->sent_queue_retran_cnt = 0;
9975 			break;
9976 		}
9977 		if (one_chunk) {
9978 			/* No more room in rwnd */
9979 			return (1);
9980 		}
9981 		/* stop the for loop here. we sent out a packet */
9982 		break;
9983 	}
9984 	return (0);
9985 }
9986 
9987 static void
9988 sctp_timer_validation(struct sctp_inpcb *inp,
9989     struct sctp_tcb *stcb,
9990     struct sctp_association *asoc)
9991 {
9992 	struct sctp_nets *net;
9993 
9994 	/* Validate that a timer is running somewhere */
9995 	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9996 		if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9997 			/* Here is a timer */
9998 			return;
9999 		}
10000 	}
10001 	SCTP_TCB_LOCK_ASSERT(stcb);
10002 	/* Gak, we did not have a timer somewhere */
10003 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
10004 	if (asoc->alternate) {
10005 		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
10006 	} else {
10007 		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
10008 	}
10009 	return;
10010 }
10011 
10012 void
10013 sctp_chunk_output(struct sctp_inpcb *inp,
10014     struct sctp_tcb *stcb,
10015     int from_where,
10016     int so_locked
10017 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10018     SCTP_UNUSED
10019 #endif
10020 )
10021 {
10022 	/*-
10023 	 * Ok this is the generic chunk service queue. we must do the
10024 	 * following:
10025 	 * - See if there are retransmits pending, if so we must
10026 	 *   do these first.
10027 	 * - Service the stream queue that is next, moving any
10028 	 *   message (note I must get a complete message i.e.
10029 	 *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
10030 	 *   TSN's
10031 	 * - Check to see if the cwnd/rwnd allows any output, if so we
10032 	 *   go ahead and fomulate and send the low level chunks. Making sure
10033 	 *   to combine any control in the control chunk queue also.
10034 	 */
10035 	struct sctp_association *asoc;
10036 	struct sctp_nets *net;
10037 	int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
10038 	unsigned int burst_cnt = 0;
10039 	struct timeval now;
10040 	int now_filled = 0;
10041 	int nagle_on;
10042 	int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10043 	int un_sent = 0;
10044 	int fr_done;
10045 	unsigned int tot_frs = 0;
10046 
10047 	asoc = &stcb->asoc;
10048 do_it_again:
10049 	/* The Nagle algorithm is only applied when handling a send call. */
10050 	if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10051 		if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10052 			nagle_on = 0;
10053 		} else {
10054 			nagle_on = 1;
10055 		}
10056 	} else {
10057 		nagle_on = 0;
10058 	}
10059 	SCTP_TCB_LOCK_ASSERT(stcb);
10060 
10061 	un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10062 
10063 	if ((un_sent <= 0) &&
10064 	    (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10065 	    (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10066 	    (asoc->sent_queue_retran_cnt == 0) &&
10067 	    (asoc->trigger_reset == 0)) {
10068 		/* Nothing to do unless there is something to be sent left */
10069 		return;
10070 	}
10071 	/*
10072 	 * Do we have something to send, data or control AND a sack timer
10073 	 * running, if so piggy-back the sack.
10074 	 */
10075 	if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10076 		sctp_send_sack(stcb, so_locked);
10077 		(void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10078 	}
10079 	while (asoc->sent_queue_retran_cnt) {
10080 		/*-
10081 		 * Ok, it is retransmission time only, we send out only ONE
10082 		 * packet with a single call off to the retran code.
10083 		 */
10084 		if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10085 			/*-
10086 			 * Special hook for handling cookiess discarded
10087 			 * by peer that carried data. Send cookie-ack only
10088 			 * and then the next call with get the retran's.
10089 			 */
10090 			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10091 			    from_where,
10092 			    &now, &now_filled, frag_point, so_locked);
10093 			return;
10094 		} else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10095 			/* if its not from a HB then do it */
10096 			fr_done = 0;
10097 			ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10098 			if (fr_done) {
10099 				tot_frs++;
10100 			}
10101 		} else {
10102 			/*
10103 			 * its from any other place, we don't allow retran
10104 			 * output (only control)
10105 			 */
10106 			ret = 1;
10107 		}
10108 		if (ret > 0) {
10109 			/* Can't send anymore */
10110 			/*-
10111 			 * now lets push out control by calling med-level
10112 			 * output once. this assures that we WILL send HB's
10113 			 * if queued too.
10114 			 */
10115 			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10116 			    from_where,
10117 			    &now, &now_filled, frag_point, so_locked);
10118 #ifdef SCTP_AUDITING_ENABLED
10119 			sctp_auditing(8, inp, stcb, NULL);
10120 #endif
10121 			sctp_timer_validation(inp, stcb, asoc);
10122 			return;
10123 		}
10124 		if (ret < 0) {
10125 			/*-
10126 			 * The count was off.. retran is not happening so do
10127 			 * the normal retransmission.
10128 			 */
10129 #ifdef SCTP_AUDITING_ENABLED
10130 			sctp_auditing(9, inp, stcb, NULL);
10131 #endif
10132 			if (ret == SCTP_RETRAN_EXIT) {
10133 				return;
10134 			}
10135 			break;
10136 		}
10137 		if (from_where == SCTP_OUTPUT_FROM_T3) {
10138 			/* Only one transmission allowed out of a timeout */
10139 #ifdef SCTP_AUDITING_ENABLED
10140 			sctp_auditing(10, inp, stcb, NULL);
10141 #endif
10142 			/* Push out any control */
10143 			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10144 			    &now, &now_filled, frag_point, so_locked);
10145 			return;
10146 		}
10147 		if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10148 			/* Hit FR burst limit */
10149 			return;
10150 		}
10151 		if ((num_out == 0) && (ret == 0)) {
10152 			/* No more retrans to send */
10153 			break;
10154 		}
10155 	}
10156 #ifdef SCTP_AUDITING_ENABLED
10157 	sctp_auditing(12, inp, stcb, NULL);
10158 #endif
10159 	/* Check for bad destinations, if they exist move chunks around. */
10160 	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10161 		if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10162 			/*-
10163 			 * if possible move things off of this address we
10164 			 * still may send below due to the dormant state but
10165 			 * we try to find an alternate address to send to
10166 			 * and if we have one we move all queued data on the
10167 			 * out wheel to this alternate address.
10168 			 */
10169 			if (net->ref_count > 1)
10170 				sctp_move_chunks_from_net(stcb, net);
10171 		} else {
10172 			/*-
10173 			 * if ((asoc->sat_network) || (net->addr_is_local))
10174 			 * { burst_limit = asoc->max_burst *
10175 			 * SCTP_SAT_NETWORK_BURST_INCR; }
10176 			 */
10177 			if (asoc->max_burst > 0) {
10178 				if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10179 					if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10180 						/*
10181 						 * JRS - Use the congestion
10182 						 * control given in the
10183 						 * congestion control module
10184 						 */
10185 						asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10186 						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10187 							sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10188 						}
10189 						SCTP_STAT_INCR(sctps_maxburstqueued);
10190 					}
10191 					net->fast_retran_ip = 0;
10192 				} else {
10193 					if (net->flight_size == 0) {
10194 						/*
10195 						 * Should be decaying the
10196 						 * cwnd here
10197 						 */
10198 						;
10199 					}
10200 				}
10201 			}
10202 		}
10203 
10204 	}
10205 	burst_cnt = 0;
10206 	do {
10207 		error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10208 		    &reason_code, 0, from_where,
10209 		    &now, &now_filled, frag_point, so_locked);
10210 		if (error) {
10211 			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10212 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10213 				sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10214 			}
10215 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10216 				sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10217 				sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10218 			}
10219 			break;
10220 		}
10221 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10222 
10223 		tot_out += num_out;
10224 		burst_cnt++;
10225 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10226 			sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10227 			if (num_out == 0) {
10228 				sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10229 			}
10230 		}
10231 		if (nagle_on) {
10232 			/*
10233 			 * When the Nagle algorithm is used, look at how
10234 			 * much is unsent, then if its smaller than an MTU
10235 			 * and we have data in flight we stop, except if we
10236 			 * are handling a fragmented user message.
10237 			 */
10238 			un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10239 			if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10240 			    (stcb->asoc.total_flight > 0)) {
10241 /*	&&		     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10242 				break;
10243 			}
10244 		}
10245 		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10246 		    TAILQ_EMPTY(&asoc->send_queue) &&
10247 		    sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10248 			/* Nothing left to send */
10249 			break;
10250 		}
10251 		if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10252 			/* Nothing left to send */
10253 			break;
10254 		}
10255 	} while (num_out &&
10256 	    ((asoc->max_burst == 0) ||
10257 	    SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10258 	    (burst_cnt < asoc->max_burst)));
10259 
10260 	if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10261 		if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10262 			SCTP_STAT_INCR(sctps_maxburstqueued);
10263 			asoc->burst_limit_applied = 1;
10264 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10265 				sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10266 			}
10267 		} else {
10268 			asoc->burst_limit_applied = 0;
10269 		}
10270 	}
10271 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10272 		sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10273 	}
10274 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10275 	    tot_out);
10276 
10277 	/*-
10278 	 * Now we need to clean up the control chunk chain if a ECNE is on
10279 	 * it. It must be marked as UNSENT again so next call will continue
10280 	 * to send it until such time that we get a CWR, to remove it.
10281 	 */
10282 	if (stcb->asoc.ecn_echo_cnt_onq)
10283 		sctp_fix_ecn_echo(asoc);
10284 
10285 	if (stcb->asoc.trigger_reset) {
10286 		if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10287 			goto do_it_again;
10288 		}
10289 	}
10290 	return;
10291 }
10292 
10293 
10294 int
10295 sctp_output(
10296     struct sctp_inpcb *inp,
10297     struct mbuf *m,
10298     struct sockaddr *addr,
10299     struct mbuf *control,
10300     struct thread *p,
10301     int flags)
10302 {
10303 	if (inp == NULL) {
10304 		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10305 		return (EINVAL);
10306 	}
10307 
10308 	if (inp->sctp_socket == NULL) {
10309 		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10310 		return (EINVAL);
10311 	}
10312 	return (sctp_sosend(inp->sctp_socket,
10313 	    addr,
10314 	    (struct uio *)NULL,
10315 	    m,
10316 	    control,
10317 	    flags, p
10318 	    ));
10319 }
10320 
10321 void
10322 send_forward_tsn(struct sctp_tcb *stcb,
10323     struct sctp_association *asoc)
10324 {
10325 	struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10326 	struct sctp_forward_tsn_chunk *fwdtsn;
10327 	struct sctp_strseq *strseq;
10328 	struct sctp_strseq_mid *strseq_m;
10329 	uint32_t advance_peer_ack_point;
10330 	unsigned int cnt_of_space, i, ovh;
10331 	unsigned int space_needed;
10332 	unsigned int cnt_of_skipped = 0;
10333 
10334 	SCTP_TCB_LOCK_ASSERT(stcb);
10335 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10336 		if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10337 			/* mark it to unsent */
10338 			chk->sent = SCTP_DATAGRAM_UNSENT;
10339 			chk->snd_count = 0;
10340 			/* Do we correct its output location? */
10341 			if (chk->whoTo) {
10342 				sctp_free_remote_addr(chk->whoTo);
10343 				chk->whoTo = NULL;
10344 			}
10345 			goto sctp_fill_in_rest;
10346 		}
10347 	}
10348 	/* Ok if we reach here we must build one */
10349 	sctp_alloc_a_chunk(stcb, chk);
10350 	if (chk == NULL) {
10351 		return;
10352 	}
10353 	asoc->fwd_tsn_cnt++;
10354 	chk->copy_by_ref = 0;
10355 	/*
10356 	 * We don't do the old thing here since this is used not for on-wire
10357 	 * but to tell if we are sending a fwd-tsn by the stack during
10358 	 * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10359 	 */
10360 	chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10361 	chk->rec.chunk_id.can_take_data = 0;
10362 	chk->flags = 0;
10363 	chk->asoc = asoc;
10364 	chk->whoTo = NULL;
10365 	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10366 	if (chk->data == NULL) {
10367 		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10368 		return;
10369 	}
10370 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10371 	chk->sent = SCTP_DATAGRAM_UNSENT;
10372 	chk->snd_count = 0;
10373 	TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10374 	asoc->ctrl_queue_cnt++;
10375 sctp_fill_in_rest:
10376 	/*-
10377 	 * Here we go through and fill out the part that deals with
10378 	 * stream/seq of the ones we skip.
10379 	 */
10380 	SCTP_BUF_LEN(chk->data) = 0;
10381 	TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10382 		if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10383 		    (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10384 			/* no more to look at */
10385 			break;
10386 		}
10387 		if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10388 			/* We don't report these */
10389 			continue;
10390 		}
10391 		cnt_of_skipped++;
10392 	}
10393 	if (asoc->idata_supported) {
10394 		space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10395 		    (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10396 	} else {
10397 		space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10398 		    (cnt_of_skipped * sizeof(struct sctp_strseq)));
10399 	}
10400 	cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10401 
10402 	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10403 		ovh = SCTP_MIN_OVERHEAD;
10404 	} else {
10405 		ovh = SCTP_MIN_V4_OVERHEAD;
10406 	}
10407 	if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10408 		/* trim to a mtu size */
10409 		cnt_of_space = asoc->smallest_mtu - ovh;
10410 	}
10411 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10412 		sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10413 		    0xff, 0, cnt_of_skipped,
10414 		    asoc->advanced_peer_ack_point);
10415 	}
10416 	advance_peer_ack_point = asoc->advanced_peer_ack_point;
10417 	if (cnt_of_space < space_needed) {
10418 		/*-
10419 		 * ok we must trim down the chunk by lowering the
10420 		 * advance peer ack point.
10421 		 */
10422 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10423 			sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10424 			    0xff, 0xff, cnt_of_space,
10425 			    space_needed);
10426 		}
10427 		cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10428 		if (asoc->idata_supported) {
10429 			cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10430 		} else {
10431 			cnt_of_skipped /= sizeof(struct sctp_strseq);
10432 		}
10433 		/*-
10434 		 * Go through and find the TSN that will be the one
10435 		 * we report.
10436 		 */
10437 		at = TAILQ_FIRST(&asoc->sent_queue);
10438 		if (at != NULL) {
10439 			for (i = 0; i < cnt_of_skipped; i++) {
10440 				tp1 = TAILQ_NEXT(at, sctp_next);
10441 				if (tp1 == NULL) {
10442 					break;
10443 				}
10444 				at = tp1;
10445 			}
10446 		}
10447 		if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10448 			sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10449 			    0xff, cnt_of_skipped, at->rec.data.tsn,
10450 			    asoc->advanced_peer_ack_point);
10451 		}
10452 		last = at;
10453 		/*-
10454 		 * last now points to last one I can report, update
10455 		 * peer ack point
10456 		 */
10457 		if (last) {
10458 			advance_peer_ack_point = last->rec.data.tsn;
10459 		}
10460 		if (asoc->idata_supported) {
10461 			space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10462 			    cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10463 		} else {
10464 			space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10465 			    cnt_of_skipped * sizeof(struct sctp_strseq);
10466 		}
10467 	}
10468 	chk->send_size = space_needed;
10469 	/* Setup the chunk */
10470 	fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10471 	fwdtsn->ch.chunk_length = htons(chk->send_size);
10472 	fwdtsn->ch.chunk_flags = 0;
10473 	if (asoc->idata_supported) {
10474 		fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10475 	} else {
10476 		fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10477 	}
10478 	fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10479 	SCTP_BUF_LEN(chk->data) = chk->send_size;
10480 	fwdtsn++;
10481 	/*-
10482 	 * Move pointer to after the fwdtsn and transfer to the
10483 	 * strseq pointer.
10484 	 */
10485 	if (asoc->idata_supported) {
10486 		strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10487 		strseq = NULL;
10488 	} else {
10489 		strseq = (struct sctp_strseq *)fwdtsn;
10490 		strseq_m = NULL;
10491 	}
10492 	/*-
10493 	 * Now populate the strseq list. This is done blindly
10494 	 * without pulling out duplicate stream info. This is
10495 	 * inefficent but won't harm the process since the peer will
10496 	 * look at these in sequence and will thus release anything.
10497 	 * It could mean we exceed the PMTU and chop off some that
10498 	 * we could have included.. but this is unlikely (aka 1432/4
10499 	 * would mean 300+ stream seq's would have to be reported in
10500 	 * one FWD-TSN. With a bit of work we can later FIX this to
10501 	 * optimize and pull out duplicates.. but it does add more
10502 	 * overhead. So for now... not!
10503 	 */
10504 	i = 0;
10505 	TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10506 		if (i >= cnt_of_skipped) {
10507 			break;
10508 		}
10509 		if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10510 			/* We don't report these */
10511 			continue;
10512 		}
10513 		if (at->rec.data.tsn == advance_peer_ack_point) {
10514 			at->rec.data.fwd_tsn_cnt = 0;
10515 		}
10516 		if (asoc->idata_supported) {
10517 			strseq_m->sid = htons(at->rec.data.sid);
10518 			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10519 				strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10520 			} else {
10521 				strseq_m->flags = 0;
10522 			}
10523 			strseq_m->mid = htonl(at->rec.data.mid);
10524 			strseq_m++;
10525 		} else {
10526 			strseq->sid = htons(at->rec.data.sid);
10527 			strseq->ssn = htons((uint16_t)at->rec.data.mid);
10528 			strseq++;
10529 		}
10530 		i++;
10531 	}
10532 	return;
10533 }
10534 
10535 void
10536 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10537 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10538     SCTP_UNUSED
10539 #endif
10540 )
10541 {
10542 	/*-
10543 	 * Queue up a SACK or NR-SACK in the control queue.
10544 	 * We must first check to see if a SACK or NR-SACK is
10545 	 * somehow on the control queue.
10546 	 * If so, we will take and and remove the old one.
10547 	 */
10548 	struct sctp_association *asoc;
10549 	struct sctp_tmit_chunk *chk, *a_chk;
10550 	struct sctp_sack_chunk *sack;
10551 	struct sctp_nr_sack_chunk *nr_sack;
10552 	struct sctp_gap_ack_block *gap_descriptor;
10553 	const struct sack_track *selector;
10554 	int mergeable = 0;
10555 	int offset;
10556 	caddr_t limit;
10557 	uint32_t *dup;
10558 	int limit_reached = 0;
10559 	unsigned int i, siz, j;
10560 	unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10561 	int num_dups = 0;
10562 	int space_req;
10563 	uint32_t highest_tsn;
10564 	uint8_t flags;
10565 	uint8_t type;
10566 	uint8_t tsn_map;
10567 
10568 	if (stcb->asoc.nrsack_supported == 1) {
10569 		type = SCTP_NR_SELECTIVE_ACK;
10570 	} else {
10571 		type = SCTP_SELECTIVE_ACK;
10572 	}
10573 	a_chk = NULL;
10574 	asoc = &stcb->asoc;
10575 	SCTP_TCB_LOCK_ASSERT(stcb);
10576 	if (asoc->last_data_chunk_from == NULL) {
10577 		/* Hmm we never received anything */
10578 		return;
10579 	}
10580 	sctp_slide_mapping_arrays(stcb);
10581 	sctp_set_rwnd(stcb, asoc);
10582 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10583 		if (chk->rec.chunk_id.id == type) {
10584 			/* Hmm, found a sack already on queue, remove it */
10585 			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10586 			asoc->ctrl_queue_cnt--;
10587 			a_chk = chk;
10588 			if (a_chk->data) {
10589 				sctp_m_freem(a_chk->data);
10590 				a_chk->data = NULL;
10591 			}
10592 			if (a_chk->whoTo) {
10593 				sctp_free_remote_addr(a_chk->whoTo);
10594 				a_chk->whoTo = NULL;
10595 			}
10596 			break;
10597 		}
10598 	}
10599 	if (a_chk == NULL) {
10600 		sctp_alloc_a_chunk(stcb, a_chk);
10601 		if (a_chk == NULL) {
10602 			/* No memory so we drop the idea, and set a timer */
10603 			if (stcb->asoc.delayed_ack) {
10604 				sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10605 				    stcb->sctp_ep, stcb, NULL,
10606 				    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10607 				sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10608 				    stcb->sctp_ep, stcb, NULL);
10609 			} else {
10610 				stcb->asoc.send_sack = 1;
10611 			}
10612 			return;
10613 		}
10614 		a_chk->copy_by_ref = 0;
10615 		a_chk->rec.chunk_id.id = type;
10616 		a_chk->rec.chunk_id.can_take_data = 1;
10617 	}
10618 	/* Clear our pkt counts */
10619 	asoc->data_pkts_seen = 0;
10620 
10621 	a_chk->flags = 0;
10622 	a_chk->asoc = asoc;
10623 	a_chk->snd_count = 0;
10624 	a_chk->send_size = 0;	/* fill in later */
10625 	a_chk->sent = SCTP_DATAGRAM_UNSENT;
10626 	a_chk->whoTo = NULL;
10627 
10628 	if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10629 		/*-
10630 		 * Ok, the destination for the SACK is unreachable, lets see if
10631 		 * we can select an alternate to asoc->last_data_chunk_from
10632 		 */
10633 		a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10634 		if (a_chk->whoTo == NULL) {
10635 			/* Nope, no alternate */
10636 			a_chk->whoTo = asoc->last_data_chunk_from;
10637 		}
10638 	} else {
10639 		a_chk->whoTo = asoc->last_data_chunk_from;
10640 	}
10641 	if (a_chk->whoTo) {
10642 		atomic_add_int(&a_chk->whoTo->ref_count, 1);
10643 	}
10644 	if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10645 		highest_tsn = asoc->highest_tsn_inside_map;
10646 	} else {
10647 		highest_tsn = asoc->highest_tsn_inside_nr_map;
10648 	}
10649 	if (highest_tsn == asoc->cumulative_tsn) {
10650 		/* no gaps */
10651 		if (type == SCTP_SELECTIVE_ACK) {
10652 			space_req = sizeof(struct sctp_sack_chunk);
10653 		} else {
10654 			space_req = sizeof(struct sctp_nr_sack_chunk);
10655 		}
10656 	} else {
10657 		/* gaps get a cluster */
10658 		space_req = MCLBYTES;
10659 	}
10660 	/* Ok now lets formulate a MBUF with our sack */
10661 	a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10662 	if ((a_chk->data == NULL) ||
10663 	    (a_chk->whoTo == NULL)) {
10664 		/* rats, no mbuf memory */
10665 		if (a_chk->data) {
10666 			/* was a problem with the destination */
10667 			sctp_m_freem(a_chk->data);
10668 			a_chk->data = NULL;
10669 		}
10670 		sctp_free_a_chunk(stcb, a_chk, so_locked);
10671 		/* sa_ignore NO_NULL_CHK */
10672 		if (stcb->asoc.delayed_ack) {
10673 			sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10674 			    stcb->sctp_ep, stcb, NULL,
10675 			    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10676 			sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10677 			    stcb->sctp_ep, stcb, NULL);
10678 		} else {
10679 			stcb->asoc.send_sack = 1;
10680 		}
10681 		return;
10682 	}
10683 	/* ok, lets go through and fill it in */
10684 	SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10685 	space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10686 	if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10687 		space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10688 	}
10689 	limit = mtod(a_chk->data, caddr_t);
10690 	limit += space;
10691 
10692 	flags = 0;
10693 
10694 	if ((asoc->sctp_cmt_on_off > 0) &&
10695 	    SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10696 		/*-
10697 		 * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10698 		 * received, then set high bit to 1, else 0. Reset
10699 		 * pkts_rcvd.
10700 		 */
10701 		flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10702 		asoc->cmt_dac_pkts_rcvd = 0;
10703 	}
10704 #ifdef SCTP_ASOCLOG_OF_TSNS
10705 	stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10706 	stcb->asoc.cumack_log_atsnt++;
10707 	if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10708 		stcb->asoc.cumack_log_atsnt = 0;
10709 	}
10710 #endif
10711 	/* reset the readers interpretation */
10712 	stcb->freed_by_sorcv_sincelast = 0;
10713 
10714 	if (type == SCTP_SELECTIVE_ACK) {
10715 		sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10716 		nr_sack = NULL;
10717 		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10718 		if (highest_tsn > asoc->mapping_array_base_tsn) {
10719 			siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10720 		} else {
10721 			siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10722 		}
10723 	} else {
10724 		sack = NULL;
10725 		nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10726 		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10727 		if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10728 			siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10729 		} else {
10730 			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10731 		}
10732 	}
10733 
10734 	if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10735 		offset = 1;
10736 	} else {
10737 		offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10738 	}
10739 	if (((type == SCTP_SELECTIVE_ACK) &&
10740 	    SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10741 	    ((type == SCTP_NR_SELECTIVE_ACK) &&
10742 	    SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10743 		/* we have a gap .. maybe */
10744 		for (i = 0; i < siz; i++) {
10745 			tsn_map = asoc->mapping_array[i];
10746 			if (type == SCTP_SELECTIVE_ACK) {
10747 				tsn_map |= asoc->nr_mapping_array[i];
10748 			}
10749 			if (i == 0) {
10750 				/*
10751 				 * Clear all bits corresponding to TSNs
10752 				 * smaller or equal to the cumulative TSN.
10753 				 */
10754 				tsn_map &= (~0U << (1 - offset));
10755 			}
10756 			selector = &sack_array[tsn_map];
10757 			if (mergeable && selector->right_edge) {
10758 				/*
10759 				 * Backup, left and right edges were ok to
10760 				 * merge.
10761 				 */
10762 				num_gap_blocks--;
10763 				gap_descriptor--;
10764 			}
10765 			if (selector->num_entries == 0)
10766 				mergeable = 0;
10767 			else {
10768 				for (j = 0; j < selector->num_entries; j++) {
10769 					if (mergeable && selector->right_edge) {
10770 						/*
10771 						 * do a merge by NOT setting
10772 						 * the left side
10773 						 */
10774 						mergeable = 0;
10775 					} else {
10776 						/*
10777 						 * no merge, set the left
10778 						 * side
10779 						 */
10780 						mergeable = 0;
10781 						gap_descriptor->start = htons((selector->gaps[j].start + offset));
10782 					}
10783 					gap_descriptor->end = htons((selector->gaps[j].end + offset));
10784 					num_gap_blocks++;
10785 					gap_descriptor++;
10786 					if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10787 						/* no more room */
10788 						limit_reached = 1;
10789 						break;
10790 					}
10791 				}
10792 				if (selector->left_edge) {
10793 					mergeable = 1;
10794 				}
10795 			}
10796 			if (limit_reached) {
10797 				/* Reached the limit stop */
10798 				break;
10799 			}
10800 			offset += 8;
10801 		}
10802 	}
10803 	if ((type == SCTP_NR_SELECTIVE_ACK) &&
10804 	    (limit_reached == 0)) {
10805 
10806 		mergeable = 0;
10807 
10808 		if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10809 			siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10810 		} else {
10811 			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10812 		}
10813 
10814 		if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10815 			offset = 1;
10816 		} else {
10817 			offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10818 		}
10819 		if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10820 			/* we have a gap .. maybe */
10821 			for (i = 0; i < siz; i++) {
10822 				tsn_map = asoc->nr_mapping_array[i];
10823 				if (i == 0) {
10824 					/*
10825 					 * Clear all bits corresponding to
10826 					 * TSNs smaller or equal to the
10827 					 * cumulative TSN.
10828 					 */
10829 					tsn_map &= (~0U << (1 - offset));
10830 				}
10831 				selector = &sack_array[tsn_map];
10832 				if (mergeable && selector->right_edge) {
10833 					/*
10834 					 * Backup, left and right edges were
10835 					 * ok to merge.
10836 					 */
10837 					num_nr_gap_blocks--;
10838 					gap_descriptor--;
10839 				}
10840 				if (selector->num_entries == 0)
10841 					mergeable = 0;
10842 				else {
10843 					for (j = 0; j < selector->num_entries; j++) {
10844 						if (mergeable && selector->right_edge) {
10845 							/*
10846 							 * do a merge by NOT
10847 							 * setting the left
10848 							 * side
10849 							 */
10850 							mergeable = 0;
10851 						} else {
10852 							/*
10853 							 * no merge, set the
10854 							 * left side
10855 							 */
10856 							mergeable = 0;
10857 							gap_descriptor->start = htons((selector->gaps[j].start + offset));
10858 						}
10859 						gap_descriptor->end = htons((selector->gaps[j].end + offset));
10860 						num_nr_gap_blocks++;
10861 						gap_descriptor++;
10862 						if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10863 							/* no more room */
10864 							limit_reached = 1;
10865 							break;
10866 						}
10867 					}
10868 					if (selector->left_edge) {
10869 						mergeable = 1;
10870 					}
10871 				}
10872 				if (limit_reached) {
10873 					/* Reached the limit stop */
10874 					break;
10875 				}
10876 				offset += 8;
10877 			}
10878 		}
10879 	}
10880 	/* now we must add any dups we are going to report. */
10881 	if ((limit_reached == 0) && (asoc->numduptsns)) {
10882 		dup = (uint32_t *)gap_descriptor;
10883 		for (i = 0; i < asoc->numduptsns; i++) {
10884 			*dup = htonl(asoc->dup_tsns[i]);
10885 			dup++;
10886 			num_dups++;
10887 			if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10888 				/* no more room */
10889 				break;
10890 			}
10891 		}
10892 		asoc->numduptsns = 0;
10893 	}
10894 	/*
10895 	 * now that the chunk is prepared queue it to the control chunk
10896 	 * queue.
10897 	 */
10898 	if (type == SCTP_SELECTIVE_ACK) {
10899 		a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10900 		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10901 		    num_dups * sizeof(int32_t));
10902 		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10903 		sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10904 		sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10905 		sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10906 		sack->sack.num_dup_tsns = htons(num_dups);
10907 		sack->ch.chunk_type = type;
10908 		sack->ch.chunk_flags = flags;
10909 		sack->ch.chunk_length = htons(a_chk->send_size);
10910 	} else {
10911 		a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10912 		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10913 		    num_dups * sizeof(int32_t));
10914 		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10915 		nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10916 		nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10917 		nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10918 		nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10919 		nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10920 		nr_sack->nr_sack.reserved = 0;
10921 		nr_sack->ch.chunk_type = type;
10922 		nr_sack->ch.chunk_flags = flags;
10923 		nr_sack->ch.chunk_length = htons(a_chk->send_size);
10924 	}
10925 	TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10926 	asoc->my_last_reported_rwnd = asoc->my_rwnd;
10927 	asoc->ctrl_queue_cnt++;
10928 	asoc->send_sack = 0;
10929 	SCTP_STAT_INCR(sctps_sendsacks);
10930 	return;
10931 }
10932 
10933 void
10934 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10935 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10936     SCTP_UNUSED
10937 #endif
10938 )
10939 {
10940 	struct mbuf *m_abort, *m, *m_last;
10941 	struct mbuf *m_out, *m_end = NULL;
10942 	struct sctp_abort_chunk *abort;
10943 	struct sctp_auth_chunk *auth = NULL;
10944 	struct sctp_nets *net;
10945 	uint32_t vtag;
10946 	uint32_t auth_offset = 0;
10947 	int error;
10948 	uint16_t cause_len, chunk_len, padding_len;
10949 
10950 	SCTP_TCB_LOCK_ASSERT(stcb);
10951 	/*-
10952 	 * Add an AUTH chunk, if chunk requires it and save the offset into
10953 	 * the chain for AUTH
10954 	 */
10955 	if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10956 	    stcb->asoc.peer_auth_chunks)) {
10957 		m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10958 		    stcb, SCTP_ABORT_ASSOCIATION);
10959 		SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10960 	} else {
10961 		m_out = NULL;
10962 	}
10963 	m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10964 	if (m_abort == NULL) {
10965 		if (m_out) {
10966 			sctp_m_freem(m_out);
10967 		}
10968 		if (operr) {
10969 			sctp_m_freem(operr);
10970 		}
10971 		return;
10972 	}
10973 	/* link in any error */
10974 	SCTP_BUF_NEXT(m_abort) = operr;
10975 	cause_len = 0;
10976 	m_last = NULL;
10977 	for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10978 		cause_len += (uint16_t)SCTP_BUF_LEN(m);
10979 		if (SCTP_BUF_NEXT(m) == NULL) {
10980 			m_last = m;
10981 		}
10982 	}
10983 	SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10984 	chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10985 	padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10986 	if (m_out == NULL) {
10987 		/* NO Auth chunk prepended, so reserve space in front */
10988 		SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10989 		m_out = m_abort;
10990 	} else {
10991 		/* Put AUTH chunk at the front of the chain */
10992 		SCTP_BUF_NEXT(m_end) = m_abort;
10993 	}
10994 	if (stcb->asoc.alternate) {
10995 		net = stcb->asoc.alternate;
10996 	} else {
10997 		net = stcb->asoc.primary_destination;
10998 	}
10999 	/* Fill in the ABORT chunk header. */
11000 	abort = mtod(m_abort, struct sctp_abort_chunk *);
11001 	abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
11002 	if (stcb->asoc.peer_vtag == 0) {
11003 		/* This happens iff the assoc is in COOKIE-WAIT state. */
11004 		vtag = stcb->asoc.my_vtag;
11005 		abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
11006 	} else {
11007 		vtag = stcb->asoc.peer_vtag;
11008 		abort->ch.chunk_flags = 0;
11009 	}
11010 	abort->ch.chunk_length = htons(chunk_len);
11011 	/* Add padding, if necessary. */
11012 	if (padding_len > 0) {
11013 		if ((m_last == NULL) ||
11014 		    (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
11015 			sctp_m_freem(m_out);
11016 			return;
11017 		}
11018 	}
11019 	if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11020 	    (struct sockaddr *)&net->ro._l_addr,
11021 	    m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
11022 	    stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
11023 	    stcb->asoc.primary_destination->port, NULL,
11024 	    0, 0,
11025 	    so_locked))) {
11026 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11027 		if (error == ENOBUFS) {
11028 			stcb->asoc.ifp_had_enobuf = 1;
11029 			SCTP_STAT_INCR(sctps_lowlevelerr);
11030 		}
11031 	} else {
11032 		stcb->asoc.ifp_had_enobuf = 0;
11033 	}
11034 	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11035 }
11036 
11037 void
11038 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11039     struct sctp_nets *net,
11040     int reflect_vtag)
11041 {
11042 	/* formulate and SEND a SHUTDOWN-COMPLETE */
11043 	struct mbuf *m_shutdown_comp;
11044 	struct sctp_shutdown_complete_chunk *shutdown_complete;
11045 	uint32_t vtag;
11046 	int error;
11047 	uint8_t flags;
11048 
11049 	m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11050 	if (m_shutdown_comp == NULL) {
11051 		/* no mbuf's */
11052 		return;
11053 	}
11054 	if (reflect_vtag) {
11055 		flags = SCTP_HAD_NO_TCB;
11056 		vtag = stcb->asoc.my_vtag;
11057 	} else {
11058 		flags = 0;
11059 		vtag = stcb->asoc.peer_vtag;
11060 	}
11061 	shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11062 	shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11063 	shutdown_complete->ch.chunk_flags = flags;
11064 	shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11065 	SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11066 	if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11067 	    (struct sockaddr *)&net->ro._l_addr,
11068 	    m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11069 	    stcb->sctp_ep->sctp_lport, stcb->rport,
11070 	    htonl(vtag),
11071 	    net->port, NULL,
11072 	    0, 0,
11073 	    SCTP_SO_NOT_LOCKED))) {
11074 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11075 		if (error == ENOBUFS) {
11076 			stcb->asoc.ifp_had_enobuf = 1;
11077 			SCTP_STAT_INCR(sctps_lowlevelerr);
11078 		}
11079 	} else {
11080 		stcb->asoc.ifp_had_enobuf = 0;
11081 	}
11082 	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11083 	return;
11084 }
11085 
11086 static void
11087 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11088     struct sctphdr *sh, uint32_t vtag,
11089     uint8_t type, struct mbuf *cause,
11090     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11091     uint32_t vrf_id, uint16_t port)
11092 {
11093 	struct mbuf *o_pak;
11094 	struct mbuf *mout;
11095 	struct sctphdr *shout;
11096 	struct sctp_chunkhdr *ch;
11097 #if defined(INET) || defined(INET6)
11098 	struct udphdr *udp;
11099 #endif
11100 	int ret, len, cause_len, padding_len;
11101 #ifdef INET
11102 	struct sockaddr_in *src_sin, *dst_sin;
11103 	struct ip *ip;
11104 #endif
11105 #ifdef INET6
11106 	struct sockaddr_in6 *src_sin6, *dst_sin6;
11107 	struct ip6_hdr *ip6;
11108 #endif
11109 
11110 	/* Compute the length of the cause and add final padding. */
11111 	cause_len = 0;
11112 	if (cause != NULL) {
11113 		struct mbuf *m_at, *m_last = NULL;
11114 
11115 		for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11116 			if (SCTP_BUF_NEXT(m_at) == NULL)
11117 				m_last = m_at;
11118 			cause_len += SCTP_BUF_LEN(m_at);
11119 		}
11120 		padding_len = cause_len % 4;
11121 		if (padding_len != 0) {
11122 			padding_len = 4 - padding_len;
11123 		}
11124 		if (padding_len != 0) {
11125 			if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11126 				sctp_m_freem(cause);
11127 				return;
11128 			}
11129 		}
11130 	} else {
11131 		padding_len = 0;
11132 	}
11133 	/* Get an mbuf for the header. */
11134 	len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11135 	switch (dst->sa_family) {
11136 #ifdef INET
11137 	case AF_INET:
11138 		len += sizeof(struct ip);
11139 		break;
11140 #endif
11141 #ifdef INET6
11142 	case AF_INET6:
11143 		len += sizeof(struct ip6_hdr);
11144 		break;
11145 #endif
11146 	default:
11147 		break;
11148 	}
11149 #if defined(INET) || defined(INET6)
11150 	if (port) {
11151 		len += sizeof(struct udphdr);
11152 	}
11153 #endif
11154 	mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11155 	if (mout == NULL) {
11156 		if (cause) {
11157 			sctp_m_freem(cause);
11158 		}
11159 		return;
11160 	}
11161 	SCTP_BUF_RESV_UF(mout, max_linkhdr);
11162 	SCTP_BUF_LEN(mout) = len;
11163 	SCTP_BUF_NEXT(mout) = cause;
11164 	M_SETFIB(mout, fibnum);
11165 	mout->m_pkthdr.flowid = mflowid;
11166 	M_HASHTYPE_SET(mout, mflowtype);
11167 #ifdef INET
11168 	ip = NULL;
11169 #endif
11170 #ifdef INET6
11171 	ip6 = NULL;
11172 #endif
11173 	switch (dst->sa_family) {
11174 #ifdef INET
11175 	case AF_INET:
11176 		src_sin = (struct sockaddr_in *)src;
11177 		dst_sin = (struct sockaddr_in *)dst;
11178 		ip = mtod(mout, struct ip *);
11179 		ip->ip_v = IPVERSION;
11180 		ip->ip_hl = (sizeof(struct ip) >> 2);
11181 		ip->ip_tos = 0;
11182 		ip->ip_off = htons(IP_DF);
11183 		ip_fillid(ip);
11184 		ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11185 		if (port) {
11186 			ip->ip_p = IPPROTO_UDP;
11187 		} else {
11188 			ip->ip_p = IPPROTO_SCTP;
11189 		}
11190 		ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11191 		ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11192 		ip->ip_sum = 0;
11193 		len = sizeof(struct ip);
11194 		shout = (struct sctphdr *)((caddr_t)ip + len);
11195 		break;
11196 #endif
11197 #ifdef INET6
11198 	case AF_INET6:
11199 		src_sin6 = (struct sockaddr_in6 *)src;
11200 		dst_sin6 = (struct sockaddr_in6 *)dst;
11201 		ip6 = mtod(mout, struct ip6_hdr *);
11202 		ip6->ip6_flow = htonl(0x60000000);
11203 		if (V_ip6_auto_flowlabel) {
11204 			ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11205 		}
11206 		ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11207 		if (port) {
11208 			ip6->ip6_nxt = IPPROTO_UDP;
11209 		} else {
11210 			ip6->ip6_nxt = IPPROTO_SCTP;
11211 		}
11212 		ip6->ip6_src = dst_sin6->sin6_addr;
11213 		ip6->ip6_dst = src_sin6->sin6_addr;
11214 		len = sizeof(struct ip6_hdr);
11215 		shout = (struct sctphdr *)((caddr_t)ip6 + len);
11216 		break;
11217 #endif
11218 	default:
11219 		len = 0;
11220 		shout = mtod(mout, struct sctphdr *);
11221 		break;
11222 	}
11223 #if defined(INET) || defined(INET6)
11224 	if (port) {
11225 		if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11226 			sctp_m_freem(mout);
11227 			return;
11228 		}
11229 		udp = (struct udphdr *)shout;
11230 		udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11231 		udp->uh_dport = port;
11232 		udp->uh_sum = 0;
11233 		udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11234 		    sizeof(struct sctphdr) +
11235 		    sizeof(struct sctp_chunkhdr) +
11236 		    cause_len + padding_len));
11237 		len += sizeof(struct udphdr);
11238 		shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11239 	} else {
11240 		udp = NULL;
11241 	}
11242 #endif
11243 	shout->src_port = sh->dest_port;
11244 	shout->dest_port = sh->src_port;
11245 	shout->checksum = 0;
11246 	if (vtag) {
11247 		shout->v_tag = htonl(vtag);
11248 	} else {
11249 		shout->v_tag = sh->v_tag;
11250 	}
11251 	len += sizeof(struct sctphdr);
11252 	ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11253 	ch->chunk_type = type;
11254 	if (vtag) {
11255 		ch->chunk_flags = 0;
11256 	} else {
11257 		ch->chunk_flags = SCTP_HAD_NO_TCB;
11258 	}
11259 	ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11260 	len += sizeof(struct sctp_chunkhdr);
11261 	len += cause_len + padding_len;
11262 
11263 	if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11264 		sctp_m_freem(mout);
11265 		return;
11266 	}
11267 	SCTP_ATTACH_CHAIN(o_pak, mout, len);
11268 	switch (dst->sa_family) {
11269 #ifdef INET
11270 	case AF_INET:
11271 		if (port) {
11272 			if (V_udp_cksum) {
11273 				udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11274 			} else {
11275 				udp->uh_sum = 0;
11276 			}
11277 		}
11278 		ip->ip_len = htons(len);
11279 		if (port) {
11280 			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11281 			SCTP_STAT_INCR(sctps_sendswcrc);
11282 			if (V_udp_cksum) {
11283 				SCTP_ENABLE_UDP_CSUM(o_pak);
11284 			}
11285 		} else {
11286 			mout->m_pkthdr.csum_flags = CSUM_SCTP;
11287 			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11288 			SCTP_STAT_INCR(sctps_sendhwcrc);
11289 		}
11290 #ifdef SCTP_PACKET_LOGGING
11291 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11292 			sctp_packet_log(o_pak);
11293 		}
11294 #endif
11295 		SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11296 		SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11297 		break;
11298 #endif
11299 #ifdef INET6
11300 	case AF_INET6:
11301 		ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11302 		if (port) {
11303 			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11304 			SCTP_STAT_INCR(sctps_sendswcrc);
11305 			if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11306 				udp->uh_sum = 0xffff;
11307 			}
11308 		} else {
11309 			mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11310 			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11311 			SCTP_STAT_INCR(sctps_sendhwcrc);
11312 		}
11313 #ifdef SCTP_PACKET_LOGGING
11314 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11315 			sctp_packet_log(o_pak);
11316 		}
11317 #endif
11318 		SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11319 		SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11320 		break;
11321 #endif
11322 	default:
11323 		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11324 		    dst->sa_family);
11325 		sctp_m_freem(mout);
11326 		SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11327 		return;
11328 	}
11329 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11330 	if (port) {
11331 		UDPSTAT_INC(udps_opackets);
11332 	}
11333 	SCTP_STAT_INCR(sctps_sendpackets);
11334 	SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11335 	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11336 	if (ret) {
11337 		SCTP_STAT_INCR(sctps_senderrors);
11338 	}
11339 	return;
11340 }
11341 
11342 void
11343 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11344     struct sctphdr *sh,
11345     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11346     uint32_t vrf_id, uint16_t port)
11347 {
11348 	sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11349 	    mflowtype, mflowid, fibnum,
11350 	    vrf_id, port);
11351 }
11352 
11353 void
11354 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11355 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11356     SCTP_UNUSED
11357 #endif
11358 )
11359 {
11360 	struct sctp_tmit_chunk *chk;
11361 	struct sctp_heartbeat_chunk *hb;
11362 	struct timeval now;
11363 
11364 	SCTP_TCB_LOCK_ASSERT(stcb);
11365 	if (net == NULL) {
11366 		return;
11367 	}
11368 	(void)SCTP_GETTIME_TIMEVAL(&now);
11369 	switch (net->ro._l_addr.sa.sa_family) {
11370 #ifdef INET
11371 	case AF_INET:
11372 		break;
11373 #endif
11374 #ifdef INET6
11375 	case AF_INET6:
11376 		break;
11377 #endif
11378 	default:
11379 		return;
11380 	}
11381 	sctp_alloc_a_chunk(stcb, chk);
11382 	if (chk == NULL) {
11383 		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11384 		return;
11385 	}
11386 
11387 	chk->copy_by_ref = 0;
11388 	chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11389 	chk->rec.chunk_id.can_take_data = 1;
11390 	chk->flags = 0;
11391 	chk->asoc = &stcb->asoc;
11392 	chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11393 
11394 	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11395 	if (chk->data == NULL) {
11396 		sctp_free_a_chunk(stcb, chk, so_locked);
11397 		return;
11398 	}
11399 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11400 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11401 	chk->sent = SCTP_DATAGRAM_UNSENT;
11402 	chk->snd_count = 0;
11403 	chk->whoTo = net;
11404 	atomic_add_int(&chk->whoTo->ref_count, 1);
11405 	/* Now we have a mbuf that we can fill in with the details */
11406 	hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11407 	memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11408 	/* fill out chunk header */
11409 	hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11410 	hb->ch.chunk_flags = 0;
11411 	hb->ch.chunk_length = htons(chk->send_size);
11412 	/* Fill out hb parameter */
11413 	hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11414 	hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11415 	hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11416 	hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11417 	/* Did our user request this one, put it in */
11418 	hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11419 	hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11420 	if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11421 		/*
11422 		 * we only take from the entropy pool if the address is not
11423 		 * confirmed.
11424 		 */
11425 		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11426 		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11427 	} else {
11428 		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11429 		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11430 	}
11431 	switch (net->ro._l_addr.sa.sa_family) {
11432 #ifdef INET
11433 	case AF_INET:
11434 		memcpy(hb->heartbeat.hb_info.address,
11435 		    &net->ro._l_addr.sin.sin_addr,
11436 		    sizeof(net->ro._l_addr.sin.sin_addr));
11437 		break;
11438 #endif
11439 #ifdef INET6
11440 	case AF_INET6:
11441 		memcpy(hb->heartbeat.hb_info.address,
11442 		    &net->ro._l_addr.sin6.sin6_addr,
11443 		    sizeof(net->ro._l_addr.sin6.sin6_addr));
11444 		break;
11445 #endif
11446 	default:
11447 		if (chk->data) {
11448 			sctp_m_freem(chk->data);
11449 			chk->data = NULL;
11450 		}
11451 		sctp_free_a_chunk(stcb, chk, so_locked);
11452 		return;
11453 		break;
11454 	}
11455 	net->hb_responded = 0;
11456 	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11457 	stcb->asoc.ctrl_queue_cnt++;
11458 	SCTP_STAT_INCR(sctps_sendheartbeat);
11459 	return;
11460 }
11461 
11462 void
11463 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11464     uint32_t high_tsn)
11465 {
11466 	struct sctp_association *asoc;
11467 	struct sctp_ecne_chunk *ecne;
11468 	struct sctp_tmit_chunk *chk;
11469 
11470 	if (net == NULL) {
11471 		return;
11472 	}
11473 	asoc = &stcb->asoc;
11474 	SCTP_TCB_LOCK_ASSERT(stcb);
11475 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11476 		if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11477 			/* found a previous ECN_ECHO update it if needed */
11478 			uint32_t cnt, ctsn;
11479 
11480 			ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11481 			ctsn = ntohl(ecne->tsn);
11482 			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11483 				ecne->tsn = htonl(high_tsn);
11484 				SCTP_STAT_INCR(sctps_queue_upd_ecne);
11485 			}
11486 			cnt = ntohl(ecne->num_pkts_since_cwr);
11487 			cnt++;
11488 			ecne->num_pkts_since_cwr = htonl(cnt);
11489 			return;
11490 		}
11491 	}
11492 	/* nope could not find one to update so we must build one */
11493 	sctp_alloc_a_chunk(stcb, chk);
11494 	if (chk == NULL) {
11495 		return;
11496 	}
11497 	SCTP_STAT_INCR(sctps_queue_upd_ecne);
11498 	chk->copy_by_ref = 0;
11499 	chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11500 	chk->rec.chunk_id.can_take_data = 0;
11501 	chk->flags = 0;
11502 	chk->asoc = &stcb->asoc;
11503 	chk->send_size = sizeof(struct sctp_ecne_chunk);
11504 	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11505 	if (chk->data == NULL) {
11506 		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11507 		return;
11508 	}
11509 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11510 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11511 	chk->sent = SCTP_DATAGRAM_UNSENT;
11512 	chk->snd_count = 0;
11513 	chk->whoTo = net;
11514 	atomic_add_int(&chk->whoTo->ref_count, 1);
11515 
11516 	stcb->asoc.ecn_echo_cnt_onq++;
11517 	ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11518 	ecne->ch.chunk_type = SCTP_ECN_ECHO;
11519 	ecne->ch.chunk_flags = 0;
11520 	ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11521 	ecne->tsn = htonl(high_tsn);
11522 	ecne->num_pkts_since_cwr = htonl(1);
11523 	TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11524 	asoc->ctrl_queue_cnt++;
11525 }
11526 
11527 void
11528 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11529     struct mbuf *m, int len, int iphlen, int bad_crc)
11530 {
11531 	struct sctp_association *asoc;
11532 	struct sctp_pktdrop_chunk *drp;
11533 	struct sctp_tmit_chunk *chk;
11534 	uint8_t *datap;
11535 	int was_trunc = 0;
11536 	int fullsz = 0;
11537 	long spc;
11538 	int offset;
11539 	struct sctp_chunkhdr *ch, chunk_buf;
11540 	unsigned int chk_length;
11541 
11542 	if (!stcb) {
11543 		return;
11544 	}
11545 	asoc = &stcb->asoc;
11546 	SCTP_TCB_LOCK_ASSERT(stcb);
11547 	if (asoc->pktdrop_supported == 0) {
11548 		/*-
11549 		 * peer must declare support before I send one.
11550 		 */
11551 		return;
11552 	}
11553 	if (stcb->sctp_socket == NULL) {
11554 		return;
11555 	}
11556 	sctp_alloc_a_chunk(stcb, chk);
11557 	if (chk == NULL) {
11558 		return;
11559 	}
11560 	chk->copy_by_ref = 0;
11561 	chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11562 	chk->rec.chunk_id.can_take_data = 1;
11563 	chk->flags = 0;
11564 	len -= iphlen;
11565 	chk->send_size = len;
11566 	/* Validate that we do not have an ABORT in here. */
11567 	offset = iphlen + sizeof(struct sctphdr);
11568 	ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11569 	    sizeof(*ch), (uint8_t *)&chunk_buf);
11570 	while (ch != NULL) {
11571 		chk_length = ntohs(ch->chunk_length);
11572 		if (chk_length < sizeof(*ch)) {
11573 			/* break to abort land */
11574 			break;
11575 		}
11576 		switch (ch->chunk_type) {
11577 		case SCTP_PACKET_DROPPED:
11578 		case SCTP_ABORT_ASSOCIATION:
11579 		case SCTP_INITIATION_ACK:
11580 			/**
11581 			 * We don't respond with an PKT-DROP to an ABORT
11582 			 * or PKT-DROP. We also do not respond to an
11583 			 * INIT-ACK, because we can't know if the initiation
11584 			 * tag is correct or not.
11585 			 */
11586 			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11587 			return;
11588 		default:
11589 			break;
11590 		}
11591 		offset += SCTP_SIZE32(chk_length);
11592 		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11593 		    sizeof(*ch), (uint8_t *)&chunk_buf);
11594 	}
11595 
11596 	if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11597 	    min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11598 		/*
11599 		 * only send 1 mtu worth, trim off the excess on the end.
11600 		 */
11601 		fullsz = len;
11602 		len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11603 		was_trunc = 1;
11604 	}
11605 	chk->asoc = &stcb->asoc;
11606 	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11607 	if (chk->data == NULL) {
11608 jump_out:
11609 		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11610 		return;
11611 	}
11612 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11613 	drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11614 	if (drp == NULL) {
11615 		sctp_m_freem(chk->data);
11616 		chk->data = NULL;
11617 		goto jump_out;
11618 	}
11619 	chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11620 	    sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11621 	chk->book_size_scale = 0;
11622 	if (was_trunc) {
11623 		drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11624 		drp->trunc_len = htons(fullsz);
11625 		/*
11626 		 * Len is already adjusted to size minus overhead above take
11627 		 * out the pkt_drop chunk itself from it.
11628 		 */
11629 		chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11630 		len = chk->send_size;
11631 	} else {
11632 		/* no truncation needed */
11633 		drp->ch.chunk_flags = 0;
11634 		drp->trunc_len = htons(0);
11635 	}
11636 	if (bad_crc) {
11637 		drp->ch.chunk_flags |= SCTP_BADCRC;
11638 	}
11639 	chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11640 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11641 	chk->sent = SCTP_DATAGRAM_UNSENT;
11642 	chk->snd_count = 0;
11643 	if (net) {
11644 		/* we should hit here */
11645 		chk->whoTo = net;
11646 		atomic_add_int(&chk->whoTo->ref_count, 1);
11647 	} else {
11648 		chk->whoTo = NULL;
11649 	}
11650 	drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11651 	drp->ch.chunk_length = htons(chk->send_size);
11652 	spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11653 	if (spc < 0) {
11654 		spc = 0;
11655 	}
11656 	drp->bottle_bw = htonl(spc);
11657 	if (asoc->my_rwnd) {
11658 		drp->current_onq = htonl(asoc->size_on_reasm_queue +
11659 		    asoc->size_on_all_streams +
11660 		    asoc->my_rwnd_control_len +
11661 		    stcb->sctp_socket->so_rcv.sb_cc);
11662 	} else {
11663 		/*-
11664 		 * If my rwnd is 0, possibly from mbuf depletion as well as
11665 		 * space used, tell the peer there is NO space aka onq == bw
11666 		 */
11667 		drp->current_onq = htonl(spc);
11668 	}
11669 	drp->reserved = 0;
11670 	datap = drp->data;
11671 	m_copydata(m, iphlen, len, (caddr_t)datap);
11672 	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11673 	asoc->ctrl_queue_cnt++;
11674 }
11675 
11676 void
11677 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11678 {
11679 	struct sctp_association *asoc;
11680 	struct sctp_cwr_chunk *cwr;
11681 	struct sctp_tmit_chunk *chk;
11682 
11683 	SCTP_TCB_LOCK_ASSERT(stcb);
11684 	if (net == NULL) {
11685 		return;
11686 	}
11687 	asoc = &stcb->asoc;
11688 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11689 		if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11690 			/*
11691 			 * found a previous CWR queued to same destination
11692 			 * update it if needed
11693 			 */
11694 			uint32_t ctsn;
11695 
11696 			cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11697 			ctsn = ntohl(cwr->tsn);
11698 			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11699 				cwr->tsn = htonl(high_tsn);
11700 			}
11701 			if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11702 				/* Make sure override is carried */
11703 				cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11704 			}
11705 			return;
11706 		}
11707 	}
11708 	sctp_alloc_a_chunk(stcb, chk);
11709 	if (chk == NULL) {
11710 		return;
11711 	}
11712 	chk->copy_by_ref = 0;
11713 	chk->rec.chunk_id.id = SCTP_ECN_CWR;
11714 	chk->rec.chunk_id.can_take_data = 1;
11715 	chk->flags = 0;
11716 	chk->asoc = &stcb->asoc;
11717 	chk->send_size = sizeof(struct sctp_cwr_chunk);
11718 	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11719 	if (chk->data == NULL) {
11720 		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11721 		return;
11722 	}
11723 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11724 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11725 	chk->sent = SCTP_DATAGRAM_UNSENT;
11726 	chk->snd_count = 0;
11727 	chk->whoTo = net;
11728 	atomic_add_int(&chk->whoTo->ref_count, 1);
11729 	cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11730 	cwr->ch.chunk_type = SCTP_ECN_CWR;
11731 	cwr->ch.chunk_flags = override;
11732 	cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11733 	cwr->tsn = htonl(high_tsn);
11734 	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11735 	asoc->ctrl_queue_cnt++;
11736 }
11737 
11738 static int
11739 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11740     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11741 {
11742 	uint16_t len, old_len, i;
11743 	struct sctp_stream_reset_out_request *req_out;
11744 	struct sctp_chunkhdr *ch;
11745 	int at;
11746 	int number_entries = 0;
11747 
11748 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11749 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11750 	/* get to new offset for the param. */
11751 	req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11752 	/* now how long will this param be? */
11753 	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11754 		if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11755 		    (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11756 		    TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11757 			number_entries++;
11758 		}
11759 	}
11760 	if (number_entries == 0) {
11761 		return (0);
11762 	}
11763 	if (number_entries == stcb->asoc.streamoutcnt) {
11764 		number_entries = 0;
11765 	}
11766 	if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11767 		number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11768 	}
11769 	len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11770 	req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11771 	req_out->ph.param_length = htons(len);
11772 	req_out->request_seq = htonl(seq);
11773 	req_out->response_seq = htonl(resp_seq);
11774 	req_out->send_reset_at_tsn = htonl(last_sent);
11775 	at = 0;
11776 	if (number_entries) {
11777 		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11778 			if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11779 			    (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11780 			    TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11781 				req_out->list_of_streams[at] = htons(i);
11782 				at++;
11783 				stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11784 				if (at >= number_entries) {
11785 					break;
11786 				}
11787 			}
11788 		}
11789 	} else {
11790 		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11791 			stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11792 		}
11793 	}
11794 	if (SCTP_SIZE32(len) > len) {
11795 		/*-
11796 		 * Need to worry about the pad we may end up adding to the
11797 		 * end. This is easy since the struct is either aligned to 4
11798 		 * bytes or 2 bytes off.
11799 		 */
11800 		req_out->list_of_streams[number_entries] = 0;
11801 	}
11802 	/* now fix the chunk length */
11803 	ch->chunk_length = htons(len + old_len);
11804 	chk->book_size = len + old_len;
11805 	chk->book_size_scale = 0;
11806 	chk->send_size = SCTP_SIZE32(chk->book_size);
11807 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11808 	return (1);
11809 }
11810 
11811 static void
11812 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11813     int number_entries, uint16_t *list,
11814     uint32_t seq)
11815 {
11816 	uint16_t len, old_len, i;
11817 	struct sctp_stream_reset_in_request *req_in;
11818 	struct sctp_chunkhdr *ch;
11819 
11820 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11821 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11822 
11823 	/* get to new offset for the param. */
11824 	req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11825 	/* now how long will this param be? */
11826 	len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11827 	req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11828 	req_in->ph.param_length = htons(len);
11829 	req_in->request_seq = htonl(seq);
11830 	if (number_entries) {
11831 		for (i = 0; i < number_entries; i++) {
11832 			req_in->list_of_streams[i] = htons(list[i]);
11833 		}
11834 	}
11835 	if (SCTP_SIZE32(len) > len) {
11836 		/*-
11837 		 * Need to worry about the pad we may end up adding to the
11838 		 * end. This is easy since the struct is either aligned to 4
11839 		 * bytes or 2 bytes off.
11840 		 */
11841 		req_in->list_of_streams[number_entries] = 0;
11842 	}
11843 	/* now fix the chunk length */
11844 	ch->chunk_length = htons(len + old_len);
11845 	chk->book_size = len + old_len;
11846 	chk->book_size_scale = 0;
11847 	chk->send_size = SCTP_SIZE32(chk->book_size);
11848 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11849 	return;
11850 }
11851 
11852 static void
11853 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11854     uint32_t seq)
11855 {
11856 	uint16_t len, old_len;
11857 	struct sctp_stream_reset_tsn_request *req_tsn;
11858 	struct sctp_chunkhdr *ch;
11859 
11860 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11861 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11862 
11863 	/* get to new offset for the param. */
11864 	req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11865 	/* now how long will this param be? */
11866 	len = sizeof(struct sctp_stream_reset_tsn_request);
11867 	req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11868 	req_tsn->ph.param_length = htons(len);
11869 	req_tsn->request_seq = htonl(seq);
11870 
11871 	/* now fix the chunk length */
11872 	ch->chunk_length = htons(len + old_len);
11873 	chk->send_size = len + old_len;
11874 	chk->book_size = SCTP_SIZE32(chk->send_size);
11875 	chk->book_size_scale = 0;
11876 	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11877 	return;
11878 }
11879 
11880 void
11881 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11882     uint32_t resp_seq, uint32_t result)
11883 {
11884 	uint16_t len, old_len;
11885 	struct sctp_stream_reset_response *resp;
11886 	struct sctp_chunkhdr *ch;
11887 
11888 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11889 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11890 
11891 	/* get to new offset for the param. */
11892 	resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11893 	/* now how long will this param be? */
11894 	len = sizeof(struct sctp_stream_reset_response);
11895 	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11896 	resp->ph.param_length = htons(len);
11897 	resp->response_seq = htonl(resp_seq);
11898 	resp->result = ntohl(result);
11899 
11900 	/* now fix the chunk length */
11901 	ch->chunk_length = htons(len + old_len);
11902 	chk->book_size = len + old_len;
11903 	chk->book_size_scale = 0;
11904 	chk->send_size = SCTP_SIZE32(chk->book_size);
11905 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11906 	return;
11907 }
11908 
11909 void
11910 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11911     struct sctp_stream_reset_list *ent,
11912     int response)
11913 {
11914 	struct sctp_association *asoc;
11915 	struct sctp_tmit_chunk *chk;
11916 	struct sctp_chunkhdr *ch;
11917 
11918 	asoc = &stcb->asoc;
11919 
11920 	/*
11921 	 * Reset our last reset action to the new one IP -> response
11922 	 * (PERFORMED probably). This assures that if we fail to send, a
11923 	 * retran from the peer will get the new response.
11924 	 */
11925 	asoc->last_reset_action[0] = response;
11926 	if (asoc->stream_reset_outstanding) {
11927 		return;
11928 	}
11929 	sctp_alloc_a_chunk(stcb, chk);
11930 	if (chk == NULL) {
11931 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11932 		return;
11933 	}
11934 	chk->copy_by_ref = 0;
11935 	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11936 	chk->rec.chunk_id.can_take_data = 0;
11937 	chk->flags = 0;
11938 	chk->asoc = &stcb->asoc;
11939 	chk->book_size = sizeof(struct sctp_chunkhdr);
11940 	chk->send_size = SCTP_SIZE32(chk->book_size);
11941 	chk->book_size_scale = 0;
11942 	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11943 	if (chk->data == NULL) {
11944 		sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11945 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11946 		return;
11947 	}
11948 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11949 	/* setup chunk parameters */
11950 	chk->sent = SCTP_DATAGRAM_UNSENT;
11951 	chk->snd_count = 0;
11952 	if (stcb->asoc.alternate) {
11953 		chk->whoTo = stcb->asoc.alternate;
11954 	} else {
11955 		chk->whoTo = stcb->asoc.primary_destination;
11956 	}
11957 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11958 	ch->chunk_type = SCTP_STREAM_RESET;
11959 	ch->chunk_flags = 0;
11960 	ch->chunk_length = htons(chk->book_size);
11961 	atomic_add_int(&chk->whoTo->ref_count, 1);
11962 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11963 	sctp_add_stream_reset_result(chk, ent->seq, response);
11964 	/* insert the chunk for sending */
11965 	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11966 	    chk,
11967 	    sctp_next);
11968 	asoc->ctrl_queue_cnt++;
11969 }
11970 
11971 void
11972 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11973     uint32_t resp_seq, uint32_t result,
11974     uint32_t send_una, uint32_t recv_next)
11975 {
11976 	uint16_t len, old_len;
11977 	struct sctp_stream_reset_response_tsn *resp;
11978 	struct sctp_chunkhdr *ch;
11979 
11980 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11981 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11982 
11983 	/* get to new offset for the param. */
11984 	resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11985 	/* now how long will this param be? */
11986 	len = sizeof(struct sctp_stream_reset_response_tsn);
11987 	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11988 	resp->ph.param_length = htons(len);
11989 	resp->response_seq = htonl(resp_seq);
11990 	resp->result = htonl(result);
11991 	resp->senders_next_tsn = htonl(send_una);
11992 	resp->receivers_next_tsn = htonl(recv_next);
11993 
11994 	/* now fix the chunk length */
11995 	ch->chunk_length = htons(len + old_len);
11996 	chk->book_size = len + old_len;
11997 	chk->send_size = SCTP_SIZE32(chk->book_size);
11998 	chk->book_size_scale = 0;
11999 	SCTP_BUF_LEN(chk->data) = chk->send_size;
12000 	return;
12001 }
12002 
12003 static void
12004 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
12005     uint32_t seq,
12006     uint16_t adding)
12007 {
12008 	uint16_t len, old_len;
12009 	struct sctp_chunkhdr *ch;
12010 	struct sctp_stream_reset_add_strm *addstr;
12011 
12012 	ch = mtod(chk->data, struct sctp_chunkhdr *);
12013 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12014 
12015 	/* get to new offset for the param. */
12016 	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12017 	/* now how long will this param be? */
12018 	len = sizeof(struct sctp_stream_reset_add_strm);
12019 
12020 	/* Fill it out. */
12021 	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
12022 	addstr->ph.param_length = htons(len);
12023 	addstr->request_seq = htonl(seq);
12024 	addstr->number_of_streams = htons(adding);
12025 	addstr->reserved = 0;
12026 
12027 	/* now fix the chunk length */
12028 	ch->chunk_length = htons(len + old_len);
12029 	chk->send_size = len + old_len;
12030 	chk->book_size = SCTP_SIZE32(chk->send_size);
12031 	chk->book_size_scale = 0;
12032 	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12033 	return;
12034 }
12035 
12036 static void
12037 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
12038     uint32_t seq,
12039     uint16_t adding)
12040 {
12041 	uint16_t len, old_len;
12042 	struct sctp_chunkhdr *ch;
12043 	struct sctp_stream_reset_add_strm *addstr;
12044 
12045 	ch = mtod(chk->data, struct sctp_chunkhdr *);
12046 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12047 
12048 	/* get to new offset for the param. */
12049 	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12050 	/* now how long will this param be? */
12051 	len = sizeof(struct sctp_stream_reset_add_strm);
12052 	/* Fill it out. */
12053 	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12054 	addstr->ph.param_length = htons(len);
12055 	addstr->request_seq = htonl(seq);
12056 	addstr->number_of_streams = htons(adding);
12057 	addstr->reserved = 0;
12058 
12059 	/* now fix the chunk length */
12060 	ch->chunk_length = htons(len + old_len);
12061 	chk->send_size = len + old_len;
12062 	chk->book_size = SCTP_SIZE32(chk->send_size);
12063 	chk->book_size_scale = 0;
12064 	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12065 	return;
12066 }
12067 
12068 int
12069 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12070 {
12071 	struct sctp_association *asoc;
12072 	struct sctp_tmit_chunk *chk;
12073 	struct sctp_chunkhdr *ch;
12074 	uint32_t seq;
12075 
12076 	asoc = &stcb->asoc;
12077 	asoc->trigger_reset = 0;
12078 	if (asoc->stream_reset_outstanding) {
12079 		return (EALREADY);
12080 	}
12081 	sctp_alloc_a_chunk(stcb, chk);
12082 	if (chk == NULL) {
12083 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12084 		return (ENOMEM);
12085 	}
12086 	chk->copy_by_ref = 0;
12087 	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12088 	chk->rec.chunk_id.can_take_data = 0;
12089 	chk->flags = 0;
12090 	chk->asoc = &stcb->asoc;
12091 	chk->book_size = sizeof(struct sctp_chunkhdr);
12092 	chk->send_size = SCTP_SIZE32(chk->book_size);
12093 	chk->book_size_scale = 0;
12094 	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12095 	if (chk->data == NULL) {
12096 		sctp_free_a_chunk(stcb, chk, so_locked);
12097 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12098 		return (ENOMEM);
12099 	}
12100 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12101 
12102 	/* setup chunk parameters */
12103 	chk->sent = SCTP_DATAGRAM_UNSENT;
12104 	chk->snd_count = 0;
12105 	if (stcb->asoc.alternate) {
12106 		chk->whoTo = stcb->asoc.alternate;
12107 	} else {
12108 		chk->whoTo = stcb->asoc.primary_destination;
12109 	}
12110 	ch = mtod(chk->data, struct sctp_chunkhdr *);
12111 	ch->chunk_type = SCTP_STREAM_RESET;
12112 	ch->chunk_flags = 0;
12113 	ch->chunk_length = htons(chk->book_size);
12114 	atomic_add_int(&chk->whoTo->ref_count, 1);
12115 	SCTP_BUF_LEN(chk->data) = chk->send_size;
12116 	seq = stcb->asoc.str_reset_seq_out;
12117 	if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12118 		seq++;
12119 		asoc->stream_reset_outstanding++;
12120 	} else {
12121 		m_freem(chk->data);
12122 		chk->data = NULL;
12123 		sctp_free_a_chunk(stcb, chk, so_locked);
12124 		return (ENOENT);
12125 	}
12126 	asoc->str_reset = chk;
12127 	/* insert the chunk for sending */
12128 	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12129 	    chk,
12130 	    sctp_next);
12131 	asoc->ctrl_queue_cnt++;
12132 
12133 	if (stcb->asoc.send_sack) {
12134 		sctp_send_sack(stcb, so_locked);
12135 	}
12136 	sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12137 	return (0);
12138 }
12139 
12140 int
12141 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12142     uint16_t number_entries, uint16_t *list,
12143     uint8_t send_in_req,
12144     uint8_t send_tsn_req,
12145     uint8_t add_stream,
12146     uint16_t adding_o,
12147     uint16_t adding_i, uint8_t peer_asked)
12148 {
12149 	struct sctp_association *asoc;
12150 	struct sctp_tmit_chunk *chk;
12151 	struct sctp_chunkhdr *ch;
12152 	int can_send_out_req = 0;
12153 	uint32_t seq;
12154 
12155 	asoc = &stcb->asoc;
12156 	if (asoc->stream_reset_outstanding) {
12157 		/*-
12158 		 * Already one pending, must get ACK back to clear the flag.
12159 		 */
12160 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12161 		return (EBUSY);
12162 	}
12163 	if ((send_in_req == 0) && (send_tsn_req == 0) &&
12164 	    (add_stream == 0)) {
12165 		/* nothing to do */
12166 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12167 		return (EINVAL);
12168 	}
12169 	if (send_tsn_req && send_in_req) {
12170 		/* error, can't do that */
12171 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12172 		return (EINVAL);
12173 	} else if (send_in_req) {
12174 		can_send_out_req = 1;
12175 	}
12176 	if (number_entries > (MCLBYTES -
12177 	    SCTP_MIN_OVERHEAD -
12178 	    sizeof(struct sctp_chunkhdr) -
12179 	    sizeof(struct sctp_stream_reset_out_request)) /
12180 	    sizeof(uint16_t)) {
12181 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12182 		return (ENOMEM);
12183 	}
12184 	sctp_alloc_a_chunk(stcb, chk);
12185 	if (chk == NULL) {
12186 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12187 		return (ENOMEM);
12188 	}
12189 	chk->copy_by_ref = 0;
12190 	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12191 	chk->rec.chunk_id.can_take_data = 0;
12192 	chk->flags = 0;
12193 	chk->asoc = &stcb->asoc;
12194 	chk->book_size = sizeof(struct sctp_chunkhdr);
12195 	chk->send_size = SCTP_SIZE32(chk->book_size);
12196 	chk->book_size_scale = 0;
12197 	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12198 	if (chk->data == NULL) {
12199 		sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12200 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12201 		return (ENOMEM);
12202 	}
12203 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12204 
12205 	/* setup chunk parameters */
12206 	chk->sent = SCTP_DATAGRAM_UNSENT;
12207 	chk->snd_count = 0;
12208 	if (stcb->asoc.alternate) {
12209 		chk->whoTo = stcb->asoc.alternate;
12210 	} else {
12211 		chk->whoTo = stcb->asoc.primary_destination;
12212 	}
12213 	atomic_add_int(&chk->whoTo->ref_count, 1);
12214 	ch = mtod(chk->data, struct sctp_chunkhdr *);
12215 	ch->chunk_type = SCTP_STREAM_RESET;
12216 	ch->chunk_flags = 0;
12217 	ch->chunk_length = htons(chk->book_size);
12218 	SCTP_BUF_LEN(chk->data) = chk->send_size;
12219 
12220 	seq = stcb->asoc.str_reset_seq_out;
12221 	if (can_send_out_req) {
12222 		int ret;
12223 
12224 		ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12225 		if (ret) {
12226 			seq++;
12227 			asoc->stream_reset_outstanding++;
12228 		}
12229 	}
12230 	if ((add_stream & 1) &&
12231 	    ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12232 		/* Need to allocate more */
12233 		struct sctp_stream_out *oldstream;
12234 		struct sctp_stream_queue_pending *sp, *nsp;
12235 		int i;
12236 #if defined(SCTP_DETAILED_STR_STATS)
12237 		int j;
12238 #endif
12239 
12240 		oldstream = stcb->asoc.strmout;
12241 		/* get some more */
12242 		SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12243 		    (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12244 		    SCTP_M_STRMO);
12245 		if (stcb->asoc.strmout == NULL) {
12246 			uint8_t x;
12247 
12248 			stcb->asoc.strmout = oldstream;
12249 			/* Turn off the bit */
12250 			x = add_stream & 0xfe;
12251 			add_stream = x;
12252 			goto skip_stuff;
12253 		}
12254 		/*
12255 		 * Ok now we proceed with copying the old out stuff and
12256 		 * initializing the new stuff.
12257 		 */
12258 		SCTP_TCB_SEND_LOCK(stcb);
12259 		stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12260 		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12261 			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12262 			stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12263 			stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12264 			stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12265 			stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12266 			stcb->asoc.strmout[i].sid = i;
12267 			stcb->asoc.strmout[i].state = oldstream[i].state;
12268 			/* FIX ME FIX ME */
12269 			/*
12270 			 * This should be a SS_COPY operation FIX ME STREAM
12271 			 * SCHEDULER EXPERT
12272 			 */
12273 			stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12274 			/* now anything on those queues? */
12275 			TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12276 				TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12277 				TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12278 			}
12279 
12280 		}
12281 		/* now the new streams */
12282 		stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12283 		for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12284 			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12285 			stcb->asoc.strmout[i].chunks_on_queues = 0;
12286 #if defined(SCTP_DETAILED_STR_STATS)
12287 			for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12288 				stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12289 				stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12290 			}
12291 #else
12292 			stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12293 			stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12294 #endif
12295 			stcb->asoc.strmout[i].next_mid_ordered = 0;
12296 			stcb->asoc.strmout[i].next_mid_unordered = 0;
12297 			stcb->asoc.strmout[i].sid = i;
12298 			stcb->asoc.strmout[i].last_msg_incomplete = 0;
12299 			stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12300 			stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12301 		}
12302 		stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12303 		SCTP_FREE(oldstream, SCTP_M_STRMO);
12304 		SCTP_TCB_SEND_UNLOCK(stcb);
12305 	}
12306 skip_stuff:
12307 	if ((add_stream & 1) && (adding_o > 0)) {
12308 		asoc->strm_pending_add_size = adding_o;
12309 		asoc->peer_req_out = peer_asked;
12310 		sctp_add_an_out_stream(chk, seq, adding_o);
12311 		seq++;
12312 		asoc->stream_reset_outstanding++;
12313 	}
12314 	if ((add_stream & 2) && (adding_i > 0)) {
12315 		sctp_add_an_in_stream(chk, seq, adding_i);
12316 		seq++;
12317 		asoc->stream_reset_outstanding++;
12318 	}
12319 	if (send_in_req) {
12320 		sctp_add_stream_reset_in(chk, number_entries, list, seq);
12321 		seq++;
12322 		asoc->stream_reset_outstanding++;
12323 	}
12324 	if (send_tsn_req) {
12325 		sctp_add_stream_reset_tsn(chk, seq);
12326 		asoc->stream_reset_outstanding++;
12327 	}
12328 	asoc->str_reset = chk;
12329 	/* insert the chunk for sending */
12330 	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12331 	    chk,
12332 	    sctp_next);
12333 	asoc->ctrl_queue_cnt++;
12334 	if (stcb->asoc.send_sack) {
12335 		sctp_send_sack(stcb, SCTP_SO_LOCKED);
12336 	}
12337 	sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12338 	return (0);
12339 }
12340 
12341 void
12342 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12343     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12344     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12345     uint32_t vrf_id, uint16_t port)
12346 {
12347 	/* Don't respond to an ABORT with an ABORT. */
12348 	if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12349 		if (cause)
12350 			sctp_m_freem(cause);
12351 		return;
12352 	}
12353 	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12354 	    mflowtype, mflowid, fibnum,
12355 	    vrf_id, port);
12356 	return;
12357 }
12358 
12359 void
12360 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12361     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12362     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12363     uint32_t vrf_id, uint16_t port)
12364 {
12365 	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12366 	    mflowtype, mflowid, fibnum,
12367 	    vrf_id, port);
12368 	return;
12369 }
12370 
12371 static struct mbuf *
12372 sctp_copy_resume(struct uio *uio,
12373     int max_send_len,
12374     int user_marks_eor,
12375     int *error,
12376     uint32_t *sndout,
12377     struct mbuf **new_tail)
12378 {
12379 	struct mbuf *m;
12380 
12381 	m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12382 	    (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12383 	if (m == NULL) {
12384 		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12385 		*error = ENOBUFS;
12386 	} else {
12387 		*sndout = m_length(m, NULL);
12388 		*new_tail = m_last(m);
12389 	}
12390 	return (m);
12391 }
12392 
12393 static int
12394 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12395     struct uio *uio,
12396     int resv_upfront)
12397 {
12398 	sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12399 	    resv_upfront, 0);
12400 	if (sp->data == NULL) {
12401 		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12402 		return (ENOBUFS);
12403 	}
12404 
12405 	sp->tail_mbuf = m_last(sp->data);
12406 	return (0);
12407 }
12408 
12409 
12410 
12411 static struct sctp_stream_queue_pending *
12412 sctp_copy_it_in(struct sctp_tcb *stcb,
12413     struct sctp_association *asoc,
12414     struct sctp_sndrcvinfo *srcv,
12415     struct uio *uio,
12416     struct sctp_nets *net,
12417     ssize_t max_send_len,
12418     int user_marks_eor,
12419     int *error)
12420 {
12421 
12422 	/*-
12423 	 * This routine must be very careful in its work. Protocol
12424 	 * processing is up and running so care must be taken to spl...()
12425 	 * when you need to do something that may effect the stcb/asoc. The
12426 	 * sb is locked however. When data is copied the protocol processing
12427 	 * should be enabled since this is a slower operation...
12428 	 */
12429 	struct sctp_stream_queue_pending *sp = NULL;
12430 	int resv_in_first;
12431 
12432 	*error = 0;
12433 	/* Now can we send this? */
12434 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12435 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12436 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12437 	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12438 		/* got data while shutting down */
12439 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12440 		*error = ECONNRESET;
12441 		goto out_now;
12442 	}
12443 	sctp_alloc_a_strmoq(stcb, sp);
12444 	if (sp == NULL) {
12445 		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12446 		*error = ENOMEM;
12447 		goto out_now;
12448 	}
12449 	sp->act_flags = 0;
12450 	sp->sender_all_done = 0;
12451 	sp->sinfo_flags = srcv->sinfo_flags;
12452 	sp->timetolive = srcv->sinfo_timetolive;
12453 	sp->ppid = srcv->sinfo_ppid;
12454 	sp->context = srcv->sinfo_context;
12455 	sp->fsn = 0;
12456 	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12457 
12458 	sp->sid = srcv->sinfo_stream;
12459 	sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12460 	if ((sp->length == (uint32_t)uio->uio_resid) &&
12461 	    ((user_marks_eor == 0) ||
12462 	    (srcv->sinfo_flags & SCTP_EOF) ||
12463 	    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12464 		sp->msg_is_complete = 1;
12465 	} else {
12466 		sp->msg_is_complete = 0;
12467 	}
12468 	sp->sender_all_done = 0;
12469 	sp->some_taken = 0;
12470 	sp->put_last_out = 0;
12471 	resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12472 	sp->data = sp->tail_mbuf = NULL;
12473 	if (sp->length == 0) {
12474 		goto skip_copy;
12475 	}
12476 	if (srcv->sinfo_keynumber_valid) {
12477 		sp->auth_keyid = srcv->sinfo_keynumber;
12478 	} else {
12479 		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12480 	}
12481 	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12482 		sctp_auth_key_acquire(stcb, sp->auth_keyid);
12483 		sp->holds_key_ref = 1;
12484 	}
12485 	*error = sctp_copy_one(sp, uio, resv_in_first);
12486 skip_copy:
12487 	if (*error) {
12488 		sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12489 		sp = NULL;
12490 	} else {
12491 		if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12492 			sp->net = net;
12493 			atomic_add_int(&sp->net->ref_count, 1);
12494 		} else {
12495 			sp->net = NULL;
12496 		}
12497 		sctp_set_prsctp_policy(sp);
12498 	}
12499 out_now:
12500 	return (sp);
12501 }
12502 
12503 
12504 int
12505 sctp_sosend(struct socket *so,
12506     struct sockaddr *addr,
12507     struct uio *uio,
12508     struct mbuf *top,
12509     struct mbuf *control,
12510     int flags,
12511     struct thread *p
12512 )
12513 {
12514 	int error, use_sndinfo = 0;
12515 	struct sctp_sndrcvinfo sndrcvninfo;
12516 	struct sockaddr *addr_to_use;
12517 #if defined(INET) && defined(INET6)
12518 	struct sockaddr_in sin;
12519 #endif
12520 
12521 	if (control) {
12522 		/* process cmsg snd/rcv info (maybe a assoc-id) */
12523 		if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12524 		    sizeof(sndrcvninfo))) {
12525 			/* got one */
12526 			use_sndinfo = 1;
12527 		}
12528 	}
12529 	addr_to_use = addr;
12530 #if defined(INET) && defined(INET6)
12531 	if ((addr) && (addr->sa_family == AF_INET6)) {
12532 		struct sockaddr_in6 *sin6;
12533 
12534 		sin6 = (struct sockaddr_in6 *)addr;
12535 		if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12536 			in6_sin6_2_sin(&sin, sin6);
12537 			addr_to_use = (struct sockaddr *)&sin;
12538 		}
12539 	}
12540 #endif
12541 	error = sctp_lower_sosend(so, addr_to_use, uio, top,
12542 	    control,
12543 	    flags,
12544 	    use_sndinfo ? &sndrcvninfo : NULL
12545 	    ,p
12546 	    );
12547 	return (error);
12548 }
12549 
12550 
12551 int
12552 sctp_lower_sosend(struct socket *so,
12553     struct sockaddr *addr,
12554     struct uio *uio,
12555     struct mbuf *i_pak,
12556     struct mbuf *control,
12557     int flags,
12558     struct sctp_sndrcvinfo *srcv
12559     ,
12560     struct thread *p
12561 )
12562 {
12563 	ssize_t sndlen = 0, max_len, local_add_more;
12564 	int error, len;
12565 	struct mbuf *top = NULL;
12566 	int queue_only = 0, queue_only_for_init = 0;
12567 	int free_cnt_applied = 0;
12568 	int un_sent;
12569 	int now_filled = 0;
12570 	unsigned int inqueue_bytes = 0;
12571 	struct sctp_block_entry be;
12572 	struct sctp_inpcb *inp;
12573 	struct sctp_tcb *stcb = NULL;
12574 	struct timeval now;
12575 	struct sctp_nets *net;
12576 	struct sctp_association *asoc;
12577 	struct sctp_inpcb *t_inp;
12578 	int user_marks_eor;
12579 	int create_lock_applied = 0;
12580 	int nagle_applies = 0;
12581 	int some_on_control = 0;
12582 	int got_all_of_the_send = 0;
12583 	int hold_tcblock = 0;
12584 	int non_blocking = 0;
12585 	ssize_t local_soresv = 0;
12586 	uint16_t port;
12587 	uint16_t sinfo_flags;
12588 	sctp_assoc_t sinfo_assoc_id;
12589 
12590 	error = 0;
12591 	net = NULL;
12592 	stcb = NULL;
12593 	asoc = NULL;
12594 
12595 	t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12596 	if (inp == NULL) {
12597 		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12598 		error = EINVAL;
12599 		if (i_pak) {
12600 			SCTP_RELEASE_PKT(i_pak);
12601 		}
12602 		return (error);
12603 	}
12604 	if ((uio == NULL) && (i_pak == NULL)) {
12605 		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12606 		return (EINVAL);
12607 	}
12608 	user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12609 	atomic_add_int(&inp->total_sends, 1);
12610 	if (uio) {
12611 		if (uio->uio_resid < 0) {
12612 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12613 			return (EINVAL);
12614 		}
12615 		sndlen = uio->uio_resid;
12616 	} else {
12617 		top = SCTP_HEADER_TO_CHAIN(i_pak);
12618 		sndlen = SCTP_HEADER_LEN(i_pak);
12619 	}
12620 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zu\n",
12621 	    (void *)addr,
12622 	    sndlen);
12623 	if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12624 	    SCTP_IS_LISTENING(inp)) {
12625 		/* The listener can NOT send */
12626 		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12627 		error = ENOTCONN;
12628 		goto out_unlocked;
12629 	}
12630 	/**
12631 	 * Pre-screen address, if one is given the sin-len
12632 	 * must be set correctly!
12633 	 */
12634 	if (addr) {
12635 		union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12636 
12637 		switch (raddr->sa.sa_family) {
12638 #ifdef INET
12639 		case AF_INET:
12640 			if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12641 				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12642 				error = EINVAL;
12643 				goto out_unlocked;
12644 			}
12645 			port = raddr->sin.sin_port;
12646 			break;
12647 #endif
12648 #ifdef INET6
12649 		case AF_INET6:
12650 			if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12651 				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12652 				error = EINVAL;
12653 				goto out_unlocked;
12654 			}
12655 			port = raddr->sin6.sin6_port;
12656 			break;
12657 #endif
12658 		default:
12659 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12660 			error = EAFNOSUPPORT;
12661 			goto out_unlocked;
12662 		}
12663 	} else
12664 		port = 0;
12665 
12666 	if (srcv) {
12667 		sinfo_flags = srcv->sinfo_flags;
12668 		sinfo_assoc_id = srcv->sinfo_assoc_id;
12669 		if (INVALID_SINFO_FLAG(sinfo_flags) ||
12670 		    PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12671 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12672 			error = EINVAL;
12673 			goto out_unlocked;
12674 		}
12675 		if (srcv->sinfo_flags)
12676 			SCTP_STAT_INCR(sctps_sends_with_flags);
12677 	} else {
12678 		sinfo_flags = inp->def_send.sinfo_flags;
12679 		sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12680 	}
12681 	if (flags & MSG_EOR) {
12682 		sinfo_flags |= SCTP_EOR;
12683 	}
12684 	if (flags & MSG_EOF) {
12685 		sinfo_flags |= SCTP_EOF;
12686 	}
12687 	if (sinfo_flags & SCTP_SENDALL) {
12688 		/* its a sendall */
12689 		error = sctp_sendall(inp, uio, top, srcv);
12690 		top = NULL;
12691 		goto out_unlocked;
12692 	}
12693 	if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12694 		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12695 		error = EINVAL;
12696 		goto out_unlocked;
12697 	}
12698 	/* now we must find the assoc */
12699 	if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12700 	    (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12701 		SCTP_INP_RLOCK(inp);
12702 		stcb = LIST_FIRST(&inp->sctp_asoc_list);
12703 		if (stcb) {
12704 			SCTP_TCB_LOCK(stcb);
12705 			hold_tcblock = 1;
12706 		}
12707 		SCTP_INP_RUNLOCK(inp);
12708 	} else if (sinfo_assoc_id) {
12709 		stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12710 		if (stcb != NULL) {
12711 			hold_tcblock = 1;
12712 		}
12713 	} else if (addr) {
12714 		/*-
12715 		 * Since we did not use findep we must
12716 		 * increment it, and if we don't find a tcb
12717 		 * decrement it.
12718 		 */
12719 		SCTP_INP_WLOCK(inp);
12720 		SCTP_INP_INCR_REF(inp);
12721 		SCTP_INP_WUNLOCK(inp);
12722 		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12723 		if (stcb == NULL) {
12724 			SCTP_INP_WLOCK(inp);
12725 			SCTP_INP_DECR_REF(inp);
12726 			SCTP_INP_WUNLOCK(inp);
12727 		} else {
12728 			hold_tcblock = 1;
12729 		}
12730 	}
12731 	if ((stcb == NULL) && (addr)) {
12732 		/* Possible implicit send? */
12733 		SCTP_ASOC_CREATE_LOCK(inp);
12734 		create_lock_applied = 1;
12735 		if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12736 		    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12737 			/* Should I really unlock ? */
12738 			SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12739 			error = EINVAL;
12740 			goto out_unlocked;
12741 
12742 		}
12743 		if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12744 		    (addr->sa_family == AF_INET6)) {
12745 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12746 			error = EINVAL;
12747 			goto out_unlocked;
12748 		}
12749 		SCTP_INP_WLOCK(inp);
12750 		SCTP_INP_INCR_REF(inp);
12751 		SCTP_INP_WUNLOCK(inp);
12752 		/* With the lock applied look again */
12753 		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12754 #if defined(INET) || defined(INET6)
12755 		if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12756 			stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12757 		}
12758 #endif
12759 		if (stcb == NULL) {
12760 			SCTP_INP_WLOCK(inp);
12761 			SCTP_INP_DECR_REF(inp);
12762 			SCTP_INP_WUNLOCK(inp);
12763 		} else {
12764 			hold_tcblock = 1;
12765 		}
12766 		if (error) {
12767 			goto out_unlocked;
12768 		}
12769 		if (t_inp != inp) {
12770 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12771 			error = ENOTCONN;
12772 			goto out_unlocked;
12773 		}
12774 	}
12775 	if (stcb == NULL) {
12776 		if (addr == NULL) {
12777 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12778 			error = ENOENT;
12779 			goto out_unlocked;
12780 		} else {
12781 			/* We must go ahead and start the INIT process */
12782 			uint32_t vrf_id;
12783 
12784 			if ((sinfo_flags & SCTP_ABORT) ||
12785 			    ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12786 				/*-
12787 				 * User asks to abort a non-existant assoc,
12788 				 * or EOF a non-existant assoc with no data
12789 				 */
12790 				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12791 				error = ENOENT;
12792 				goto out_unlocked;
12793 			}
12794 			/* get an asoc/stcb struct */
12795 			vrf_id = inp->def_vrf_id;
12796 #ifdef INVARIANTS
12797 			if (create_lock_applied == 0) {
12798 				panic("Error, should hold create lock and I don't?");
12799 			}
12800 #endif
12801 			stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12802 			    inp->sctp_ep.pre_open_stream_count,
12803 			    inp->sctp_ep.port,
12804 			    p,
12805 			    SCTP_INITIALIZE_AUTH_PARAMS);
12806 			if (stcb == NULL) {
12807 				/* Error is setup for us in the call */
12808 				goto out_unlocked;
12809 			}
12810 			if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12811 				stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12812 				/*
12813 				 * Set the connected flag so we can queue
12814 				 * data
12815 				 */
12816 				soisconnecting(so);
12817 			}
12818 			hold_tcblock = 1;
12819 			if (create_lock_applied) {
12820 				SCTP_ASOC_CREATE_UNLOCK(inp);
12821 				create_lock_applied = 0;
12822 			} else {
12823 				SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12824 			}
12825 			/*
12826 			 * Turn on queue only flag to prevent data from
12827 			 * being sent
12828 			 */
12829 			queue_only = 1;
12830 			asoc = &stcb->asoc;
12831 			SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12832 			(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12833 
12834 			if (control) {
12835 				if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12836 					sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12837 					    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12838 					hold_tcblock = 0;
12839 					stcb = NULL;
12840 					goto out_unlocked;
12841 				}
12842 			}
12843 			/* out with the INIT */
12844 			queue_only_for_init = 1;
12845 			/*-
12846 			 * we may want to dig in after this call and adjust the MTU
12847 			 * value. It defaulted to 1500 (constant) but the ro
12848 			 * structure may now have an update and thus we may need to
12849 			 * change it BEFORE we append the message.
12850 			 */
12851 		}
12852 	} else
12853 		asoc = &stcb->asoc;
12854 	if (srcv == NULL) {
12855 		srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12856 		sinfo_flags = srcv->sinfo_flags;
12857 		if (flags & MSG_EOR) {
12858 			sinfo_flags |= SCTP_EOR;
12859 		}
12860 		if (flags & MSG_EOF) {
12861 			sinfo_flags |= SCTP_EOF;
12862 		}
12863 	}
12864 	if (sinfo_flags & SCTP_ADDR_OVER) {
12865 		if (addr)
12866 			net = sctp_findnet(stcb, addr);
12867 		else
12868 			net = NULL;
12869 		if ((net == NULL) ||
12870 		    ((port != 0) && (port != stcb->rport))) {
12871 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12872 			error = EINVAL;
12873 			goto out_unlocked;
12874 		}
12875 	} else {
12876 		if (stcb->asoc.alternate) {
12877 			net = stcb->asoc.alternate;
12878 		} else {
12879 			net = stcb->asoc.primary_destination;
12880 		}
12881 	}
12882 	atomic_add_int(&stcb->total_sends, 1);
12883 	/* Keep the stcb from being freed under our feet */
12884 	atomic_add_int(&asoc->refcnt, 1);
12885 	free_cnt_applied = 1;
12886 
12887 	if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12888 		if (sndlen > (ssize_t)asoc->smallest_mtu) {
12889 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12890 			error = EMSGSIZE;
12891 			goto out_unlocked;
12892 		}
12893 	}
12894 	if (SCTP_SO_IS_NBIO(so)
12895 	    || (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0
12896 	    ) {
12897 		non_blocking = 1;
12898 	}
12899 	/* would we block? */
12900 	if (non_blocking) {
12901 		ssize_t amount;
12902 
12903 		if (hold_tcblock == 0) {
12904 			SCTP_TCB_LOCK(stcb);
12905 			hold_tcblock = 1;
12906 		}
12907 		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12908 		if (user_marks_eor == 0) {
12909 			amount = sndlen;
12910 		} else {
12911 			amount = 1;
12912 		}
12913 		if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12914 		    (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12915 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12916 			if (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(so))
12917 				error = EMSGSIZE;
12918 			else
12919 				error = EWOULDBLOCK;
12920 			goto out_unlocked;
12921 		}
12922 		stcb->asoc.sb_send_resv += (uint32_t)sndlen;
12923 		SCTP_TCB_UNLOCK(stcb);
12924 		hold_tcblock = 0;
12925 	} else {
12926 		atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12927 	}
12928 	local_soresv = sndlen;
12929 	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12930 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12931 		error = ECONNRESET;
12932 		goto out_unlocked;
12933 	}
12934 	if (create_lock_applied) {
12935 		SCTP_ASOC_CREATE_UNLOCK(inp);
12936 		create_lock_applied = 0;
12937 	}
12938 	/* Is the stream no. valid? */
12939 	if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12940 		/* Invalid stream number */
12941 		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12942 		error = EINVAL;
12943 		goto out_unlocked;
12944 	}
12945 	if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12946 	    (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12947 		/*
12948 		 * Can't queue any data while stream reset is underway.
12949 		 */
12950 		if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12951 			error = EAGAIN;
12952 		} else {
12953 			error = EINVAL;
12954 		}
12955 		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12956 		goto out_unlocked;
12957 	}
12958 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12959 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12960 		queue_only = 1;
12961 	}
12962 	/* we are now done with all control */
12963 	if (control) {
12964 		sctp_m_freem(control);
12965 		control = NULL;
12966 	}
12967 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12968 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12969 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12970 	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12971 		if (sinfo_flags & SCTP_ABORT) {
12972 			;
12973 		} else {
12974 			SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12975 			error = ECONNRESET;
12976 			goto out_unlocked;
12977 		}
12978 	}
12979 	/* Ok, we will attempt a msgsnd :> */
12980 	if (p) {
12981 		p->td_ru.ru_msgsnd++;
12982 	}
12983 	/* Are we aborting? */
12984 	if (sinfo_flags & SCTP_ABORT) {
12985 		struct mbuf *mm;
12986 		ssize_t tot_demand, tot_out = 0, max_out;
12987 
12988 		SCTP_STAT_INCR(sctps_sends_with_abort);
12989 		if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12990 		    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12991 			/* It has to be up before we abort */
12992 			/* how big is the user initiated abort? */
12993 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12994 			error = EINVAL;
12995 			goto out;
12996 		}
12997 		if (hold_tcblock) {
12998 			SCTP_TCB_UNLOCK(stcb);
12999 			hold_tcblock = 0;
13000 		}
13001 		if (top) {
13002 			struct mbuf *cntm = NULL;
13003 
13004 			mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
13005 			if (sndlen != 0) {
13006 				for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
13007 					tot_out += SCTP_BUF_LEN(cntm);
13008 				}
13009 			}
13010 		} else {
13011 			/* Must fit in a MTU */
13012 			tot_out = sndlen;
13013 			tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
13014 			if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
13015 				/* To big */
13016 				SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13017 				error = EMSGSIZE;
13018 				goto out;
13019 			}
13020 			mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_WAITOK, 1, MT_DATA);
13021 		}
13022 		if (mm == NULL) {
13023 			SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
13024 			error = ENOMEM;
13025 			goto out;
13026 		}
13027 		max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
13028 		max_out -= sizeof(struct sctp_abort_msg);
13029 		if (tot_out > max_out) {
13030 			tot_out = max_out;
13031 		}
13032 		if (mm) {
13033 			struct sctp_paramhdr *ph;
13034 
13035 			/* now move forward the data pointer */
13036 			ph = mtod(mm, struct sctp_paramhdr *);
13037 			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
13038 			ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
13039 			ph++;
13040 			SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
13041 			if (top == NULL) {
13042 				error = uiomove((caddr_t)ph, (int)tot_out, uio);
13043 				if (error) {
13044 					/*-
13045 					 * Here if we can't get his data we
13046 					 * still abort we just don't get to
13047 					 * send the users note :-0
13048 					 */
13049 					sctp_m_freem(mm);
13050 					mm = NULL;
13051 				}
13052 			} else {
13053 				if (sndlen != 0) {
13054 					SCTP_BUF_NEXT(mm) = top;
13055 				}
13056 			}
13057 		}
13058 		if (hold_tcblock == 0) {
13059 			SCTP_TCB_LOCK(stcb);
13060 		}
13061 		atomic_add_int(&stcb->asoc.refcnt, -1);
13062 		free_cnt_applied = 0;
13063 		/* release this lock, otherwise we hang on ourselves */
13064 		sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13065 		/* now relock the stcb so everything is sane */
13066 		hold_tcblock = 0;
13067 		stcb = NULL;
13068 		/*
13069 		 * In this case top is already chained to mm avoid double
13070 		 * free, since we free it below if top != NULL and driver
13071 		 * would free it after sending the packet out
13072 		 */
13073 		if (sndlen != 0) {
13074 			top = NULL;
13075 		}
13076 		goto out_unlocked;
13077 	}
13078 	/* Calculate the maximum we can send */
13079 	inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13080 	if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13081 		max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13082 	} else {
13083 		max_len = 0;
13084 	}
13085 	if (hold_tcblock) {
13086 		SCTP_TCB_UNLOCK(stcb);
13087 		hold_tcblock = 0;
13088 	}
13089 	if (asoc->strmout == NULL) {
13090 		/* huh? software error */
13091 		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13092 		error = EFAULT;
13093 		goto out_unlocked;
13094 	}
13095 
13096 	/* Unless E_EOR mode is on, we must make a send FIT in one call. */
13097 	if ((user_marks_eor == 0) &&
13098 	    (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13099 		/* It will NEVER fit */
13100 		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13101 		error = EMSGSIZE;
13102 		goto out_unlocked;
13103 	}
13104 	if ((uio == NULL) && user_marks_eor) {
13105 		/*-
13106 		 * We do not support eeor mode for
13107 		 * sending with mbuf chains (like sendfile).
13108 		 */
13109 		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13110 		error = EINVAL;
13111 		goto out_unlocked;
13112 	}
13113 
13114 	if (user_marks_eor) {
13115 		local_add_more = (ssize_t)min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13116 	} else {
13117 		/*-
13118 		 * For non-eeor the whole message must fit in
13119 		 * the socket send buffer.
13120 		 */
13121 		local_add_more = sndlen;
13122 	}
13123 	len = 0;
13124 	if (non_blocking) {
13125 		goto skip_preblock;
13126 	}
13127 	if (((max_len <= local_add_more) &&
13128 	    ((ssize_t)SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13129 	    (max_len == 0) ||
13130 	    ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13131 		/* No room right now ! */
13132 		SOCKBUF_LOCK(&so->so_snd);
13133 		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13134 		while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13135 		    ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13136 			SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %zd) || (%d+%d > %d)\n",
13137 			    (unsigned int)SCTP_SB_LIMIT_SND(so),
13138 			    inqueue_bytes,
13139 			    local_add_more,
13140 			    stcb->asoc.stream_queue_cnt,
13141 			    stcb->asoc.chunks_on_out_queue,
13142 			    SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13143 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13144 				sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13145 			}
13146 			be.error = 0;
13147 			stcb->block_entry = &be;
13148 			error = sbwait(&so->so_snd);
13149 			stcb->block_entry = NULL;
13150 			if (error || so->so_error || be.error) {
13151 				if (error == 0) {
13152 					if (so->so_error)
13153 						error = so->so_error;
13154 					if (be.error) {
13155 						error = be.error;
13156 					}
13157 				}
13158 				SOCKBUF_UNLOCK(&so->so_snd);
13159 				goto out_unlocked;
13160 			}
13161 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13162 				sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13163 				    asoc, stcb->asoc.total_output_queue_size);
13164 			}
13165 			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13166 				SOCKBUF_UNLOCK(&so->so_snd);
13167 				goto out_unlocked;
13168 			}
13169 			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13170 		}
13171 		if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13172 			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13173 		} else {
13174 			max_len = 0;
13175 		}
13176 		SOCKBUF_UNLOCK(&so->so_snd);
13177 	}
13178 
13179 skip_preblock:
13180 	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13181 		goto out_unlocked;
13182 	}
13183 	/*
13184 	 * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13185 	 * case NOTE: uio will be null when top/mbuf is passed
13186 	 */
13187 	if (sndlen == 0) {
13188 		if (sinfo_flags & SCTP_EOF) {
13189 			got_all_of_the_send = 1;
13190 			goto dataless_eof;
13191 		} else {
13192 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13193 			error = EINVAL;
13194 			goto out;
13195 		}
13196 	}
13197 	if (top == NULL) {
13198 		struct sctp_stream_queue_pending *sp;
13199 		struct sctp_stream_out *strm;
13200 		uint32_t sndout;
13201 
13202 		SCTP_TCB_SEND_LOCK(stcb);
13203 		if ((asoc->stream_locked) &&
13204 		    (asoc->stream_locked_on != srcv->sinfo_stream)) {
13205 			SCTP_TCB_SEND_UNLOCK(stcb);
13206 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13207 			error = EINVAL;
13208 			goto out;
13209 		}
13210 		SCTP_TCB_SEND_UNLOCK(stcb);
13211 
13212 		strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13213 		if (strm->last_msg_incomplete == 0) {
13214 	do_a_copy_in:
13215 			sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13216 			if (error) {
13217 				goto out;
13218 			}
13219 			SCTP_TCB_SEND_LOCK(stcb);
13220 			if (sp->msg_is_complete) {
13221 				strm->last_msg_incomplete = 0;
13222 				asoc->stream_locked = 0;
13223 			} else {
13224 				/*
13225 				 * Just got locked to this guy in case of an
13226 				 * interrupt.
13227 				 */
13228 				strm->last_msg_incomplete = 1;
13229 				if (stcb->asoc.idata_supported == 0) {
13230 					asoc->stream_locked = 1;
13231 					asoc->stream_locked_on = srcv->sinfo_stream;
13232 				}
13233 				sp->sender_all_done = 0;
13234 			}
13235 			sctp_snd_sb_alloc(stcb, sp->length);
13236 			atomic_add_int(&asoc->stream_queue_cnt, 1);
13237 			if (sinfo_flags & SCTP_UNORDERED) {
13238 				SCTP_STAT_INCR(sctps_sends_with_unord);
13239 			}
13240 			TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13241 			stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13242 			SCTP_TCB_SEND_UNLOCK(stcb);
13243 		} else {
13244 			SCTP_TCB_SEND_LOCK(stcb);
13245 			sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13246 			SCTP_TCB_SEND_UNLOCK(stcb);
13247 			if (sp == NULL) {
13248 				/* ???? Huh ??? last msg is gone */
13249 #ifdef INVARIANTS
13250 				panic("Warning: Last msg marked incomplete, yet nothing left?");
13251 #else
13252 				SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13253 				strm->last_msg_incomplete = 0;
13254 #endif
13255 				goto do_a_copy_in;
13256 
13257 			}
13258 		}
13259 		while (uio->uio_resid > 0) {
13260 			/* How much room do we have? */
13261 			struct mbuf *new_tail, *mm;
13262 
13263 			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13264 			if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13265 				max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13266 			else
13267 				max_len = 0;
13268 
13269 			if ((max_len > (ssize_t)SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13270 			    (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13271 			    (uio->uio_resid && (uio->uio_resid <= max_len))) {
13272 				sndout = 0;
13273 				new_tail = NULL;
13274 				if (hold_tcblock) {
13275 					SCTP_TCB_UNLOCK(stcb);
13276 					hold_tcblock = 0;
13277 				}
13278 				mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13279 				if ((mm == NULL) || error) {
13280 					if (mm) {
13281 						sctp_m_freem(mm);
13282 					}
13283 					goto out;
13284 				}
13285 				/* Update the mbuf and count */
13286 				SCTP_TCB_SEND_LOCK(stcb);
13287 				if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13288 					/*
13289 					 * we need to get out. Peer probably
13290 					 * aborted.
13291 					 */
13292 					sctp_m_freem(mm);
13293 					if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13294 						SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13295 						error = ECONNRESET;
13296 					}
13297 					SCTP_TCB_SEND_UNLOCK(stcb);
13298 					goto out;
13299 				}
13300 				if (sp->tail_mbuf) {
13301 					/* tack it to the end */
13302 					SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13303 					sp->tail_mbuf = new_tail;
13304 				} else {
13305 					/* A stolen mbuf */
13306 					sp->data = mm;
13307 					sp->tail_mbuf = new_tail;
13308 				}
13309 				sctp_snd_sb_alloc(stcb, sndout);
13310 				atomic_add_int(&sp->length, sndout);
13311 				len += sndout;
13312 				if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13313 					sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13314 				}
13315 
13316 				/* Did we reach EOR? */
13317 				if ((uio->uio_resid == 0) &&
13318 				    ((user_marks_eor == 0) ||
13319 				    (sinfo_flags & SCTP_EOF) ||
13320 				    (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
13321 					sp->msg_is_complete = 1;
13322 				} else {
13323 					sp->msg_is_complete = 0;
13324 				}
13325 				SCTP_TCB_SEND_UNLOCK(stcb);
13326 			}
13327 			if (uio->uio_resid == 0) {
13328 				/* got it all? */
13329 				continue;
13330 			}
13331 			/* PR-SCTP? */
13332 			if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13333 				/*
13334 				 * This is ugly but we must assure locking
13335 				 * order
13336 				 */
13337 				if (hold_tcblock == 0) {
13338 					SCTP_TCB_LOCK(stcb);
13339 					hold_tcblock = 1;
13340 				}
13341 				sctp_prune_prsctp(stcb, asoc, srcv, (int)sndlen);
13342 				inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13343 				if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13344 					max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13345 				else
13346 					max_len = 0;
13347 				if (max_len > 0) {
13348 					continue;
13349 				}
13350 				SCTP_TCB_UNLOCK(stcb);
13351 				hold_tcblock = 0;
13352 			}
13353 			/* wait for space now */
13354 			if (non_blocking) {
13355 				/* Non-blocking io in place out */
13356 				goto skip_out_eof;
13357 			}
13358 			/* What about the INIT, send it maybe */
13359 			if (queue_only_for_init) {
13360 				if (hold_tcblock == 0) {
13361 					SCTP_TCB_LOCK(stcb);
13362 					hold_tcblock = 1;
13363 				}
13364 				if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13365 					/* a collision took us forward? */
13366 					queue_only = 0;
13367 				} else {
13368 					sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13369 					SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13370 					queue_only = 1;
13371 				}
13372 			}
13373 			if ((net->flight_size > net->cwnd) &&
13374 			    (asoc->sctp_cmt_on_off == 0)) {
13375 				SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13376 				queue_only = 1;
13377 			} else if (asoc->ifp_had_enobuf) {
13378 				SCTP_STAT_INCR(sctps_ifnomemqueued);
13379 				if (net->flight_size > (2 * net->mtu)) {
13380 					queue_only = 1;
13381 				}
13382 				asoc->ifp_had_enobuf = 0;
13383 			}
13384 			un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13385 			if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13386 			    (stcb->asoc.total_flight > 0) &&
13387 			    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13388 			    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13389 
13390 				/*-
13391 				 * Ok, Nagle is set on and we have data outstanding.
13392 				 * Don't send anything and let SACKs drive out the
13393 				 * data unless we have a "full" segment to send.
13394 				 */
13395 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13396 					sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13397 				}
13398 				SCTP_STAT_INCR(sctps_naglequeued);
13399 				nagle_applies = 1;
13400 			} else {
13401 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13402 					if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13403 						sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13404 				}
13405 				SCTP_STAT_INCR(sctps_naglesent);
13406 				nagle_applies = 0;
13407 			}
13408 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13409 
13410 				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13411 				    nagle_applies, un_sent);
13412 				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13413 				    stcb->asoc.total_flight,
13414 				    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13415 			}
13416 			if (queue_only_for_init)
13417 				queue_only_for_init = 0;
13418 			if ((queue_only == 0) && (nagle_applies == 0)) {
13419 				/*-
13420 				 * need to start chunk output
13421 				 * before blocking.. note that if
13422 				 * a lock is already applied, then
13423 				 * the input via the net is happening
13424 				 * and I don't need to start output :-D
13425 				 */
13426 				if (hold_tcblock == 0) {
13427 					if (SCTP_TCB_TRYLOCK(stcb)) {
13428 						hold_tcblock = 1;
13429 						sctp_chunk_output(inp,
13430 						    stcb,
13431 						    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13432 					}
13433 				} else {
13434 					sctp_chunk_output(inp,
13435 					    stcb,
13436 					    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13437 				}
13438 			}
13439 			if (hold_tcblock == 1) {
13440 				SCTP_TCB_UNLOCK(stcb);
13441 				hold_tcblock = 0;
13442 			}
13443 			SOCKBUF_LOCK(&so->so_snd);
13444 			/*-
13445 			 * This is a bit strange, but I think it will
13446 			 * work. The total_output_queue_size is locked and
13447 			 * protected by the TCB_LOCK, which we just released.
13448 			 * There is a race that can occur between releasing it
13449 			 * above, and me getting the socket lock, where sacks
13450 			 * come in but we have not put the SB_WAIT on the
13451 			 * so_snd buffer to get the wakeup. After the LOCK
13452 			 * is applied the sack_processing will also need to
13453 			 * LOCK the so->so_snd to do the actual sowwakeup(). So
13454 			 * once we have the socket buffer lock if we recheck the
13455 			 * size we KNOW we will get to sleep safely with the
13456 			 * wakeup flag in place.
13457 			 */
13458 			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13459 			if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13460 			    min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13461 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13462 					sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13463 					    asoc, uio->uio_resid);
13464 				}
13465 				be.error = 0;
13466 				stcb->block_entry = &be;
13467 				error = sbwait(&so->so_snd);
13468 				stcb->block_entry = NULL;
13469 
13470 				if (error || so->so_error || be.error) {
13471 					if (error == 0) {
13472 						if (so->so_error)
13473 							error = so->so_error;
13474 						if (be.error) {
13475 							error = be.error;
13476 						}
13477 					}
13478 					SOCKBUF_UNLOCK(&so->so_snd);
13479 					goto out_unlocked;
13480 				}
13481 
13482 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13483 					sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13484 					    asoc, stcb->asoc.total_output_queue_size);
13485 				}
13486 			}
13487 			SOCKBUF_UNLOCK(&so->so_snd);
13488 			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13489 				goto out_unlocked;
13490 			}
13491 		}
13492 		SCTP_TCB_SEND_LOCK(stcb);
13493 		if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13494 			SCTP_TCB_SEND_UNLOCK(stcb);
13495 			goto out_unlocked;
13496 		}
13497 		if (sp) {
13498 			if (sp->msg_is_complete == 0) {
13499 				strm->last_msg_incomplete = 1;
13500 				if (stcb->asoc.idata_supported == 0) {
13501 					asoc->stream_locked = 1;
13502 					asoc->stream_locked_on = srcv->sinfo_stream;
13503 				}
13504 			} else {
13505 				sp->sender_all_done = 1;
13506 				strm->last_msg_incomplete = 0;
13507 				asoc->stream_locked = 0;
13508 			}
13509 		} else {
13510 			SCTP_PRINTF("Huh no sp TSNH?\n");
13511 			strm->last_msg_incomplete = 0;
13512 			asoc->stream_locked = 0;
13513 		}
13514 		SCTP_TCB_SEND_UNLOCK(stcb);
13515 		if (uio->uio_resid == 0) {
13516 			got_all_of_the_send = 1;
13517 		}
13518 	} else {
13519 		/* We send in a 0, since we do NOT have any locks */
13520 		error = sctp_msg_append(stcb, net, top, srcv, 0);
13521 		top = NULL;
13522 		if (sinfo_flags & SCTP_EOF) {
13523 			/*
13524 			 * This should only happen for Panda for the mbuf
13525 			 * send case, which does NOT yet support EEOR mode.
13526 			 * Thus, we can just set this flag to do the proper
13527 			 * EOF handling.
13528 			 */
13529 			got_all_of_the_send = 1;
13530 		}
13531 	}
13532 	if (error) {
13533 		goto out;
13534 	}
13535 dataless_eof:
13536 	/* EOF thing ? */
13537 	if ((sinfo_flags & SCTP_EOF) &&
13538 	    (got_all_of_the_send == 1)) {
13539 		SCTP_STAT_INCR(sctps_sends_with_eof);
13540 		error = 0;
13541 		if (hold_tcblock == 0) {
13542 			SCTP_TCB_LOCK(stcb);
13543 			hold_tcblock = 1;
13544 		}
13545 		if (TAILQ_EMPTY(&asoc->send_queue) &&
13546 		    TAILQ_EMPTY(&asoc->sent_queue) &&
13547 		    sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13548 			if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13549 				goto abort_anyway;
13550 			}
13551 			/* there is nothing queued to send, so I'm done... */
13552 			if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13553 			    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13554 			    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13555 				struct sctp_nets *netp;
13556 
13557 				/* only send SHUTDOWN the first time through */
13558 				if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13559 					SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13560 				}
13561 				SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13562 				sctp_stop_timers_for_shutdown(stcb);
13563 				if (stcb->asoc.alternate) {
13564 					netp = stcb->asoc.alternate;
13565 				} else {
13566 					netp = stcb->asoc.primary_destination;
13567 				}
13568 				sctp_send_shutdown(stcb, netp);
13569 				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13570 				    netp);
13571 				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13572 				    asoc->primary_destination);
13573 			}
13574 		} else {
13575 			/*-
13576 			 * we still got (or just got) data to send, so set
13577 			 * SHUTDOWN_PENDING
13578 			 */
13579 			/*-
13580 			 * XXX sockets draft says that SCTP_EOF should be
13581 			 * sent with no data.  currently, we will allow user
13582 			 * data to be sent first and move to
13583 			 * SHUTDOWN-PENDING
13584 			 */
13585 			if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13586 			    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13587 			    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13588 				if (hold_tcblock == 0) {
13589 					SCTP_TCB_LOCK(stcb);
13590 					hold_tcblock = 1;
13591 				}
13592 				if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13593 					SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13594 				}
13595 				SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13596 				if (TAILQ_EMPTY(&asoc->send_queue) &&
13597 				    TAILQ_EMPTY(&asoc->sent_queue) &&
13598 				    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13599 					struct mbuf *op_err;
13600 					char msg[SCTP_DIAG_INFO_LEN];
13601 
13602 			abort_anyway:
13603 					if (free_cnt_applied) {
13604 						atomic_add_int(&stcb->asoc.refcnt, -1);
13605 						free_cnt_applied = 0;
13606 					}
13607 					snprintf(msg, sizeof(msg),
13608 					    "%s:%d at %s", __FILE__, __LINE__, __func__);
13609 					op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13610 					    msg);
13611 					sctp_abort_an_association(stcb->sctp_ep, stcb,
13612 					    op_err, SCTP_SO_LOCKED);
13613 					/*
13614 					 * now relock the stcb so everything
13615 					 * is sane
13616 					 */
13617 					hold_tcblock = 0;
13618 					stcb = NULL;
13619 					goto out;
13620 				}
13621 				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13622 				    asoc->primary_destination);
13623 				sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13624 			}
13625 		}
13626 	}
13627 skip_out_eof:
13628 	if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13629 		some_on_control = 1;
13630 	}
13631 	if (queue_only_for_init) {
13632 		if (hold_tcblock == 0) {
13633 			SCTP_TCB_LOCK(stcb);
13634 			hold_tcblock = 1;
13635 		}
13636 		if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13637 			/* a collision took us forward? */
13638 			queue_only = 0;
13639 		} else {
13640 			sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13641 			SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13642 			queue_only = 1;
13643 		}
13644 	}
13645 	if ((net->flight_size > net->cwnd) &&
13646 	    (stcb->asoc.sctp_cmt_on_off == 0)) {
13647 		SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13648 		queue_only = 1;
13649 	} else if (asoc->ifp_had_enobuf) {
13650 		SCTP_STAT_INCR(sctps_ifnomemqueued);
13651 		if (net->flight_size > (2 * net->mtu)) {
13652 			queue_only = 1;
13653 		}
13654 		asoc->ifp_had_enobuf = 0;
13655 	}
13656 	un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13657 	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13658 	    (stcb->asoc.total_flight > 0) &&
13659 	    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13660 	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13661 		/*-
13662 		 * Ok, Nagle is set on and we have data outstanding.
13663 		 * Don't send anything and let SACKs drive out the
13664 		 * data unless wen have a "full" segment to send.
13665 		 */
13666 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13667 			sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13668 		}
13669 		SCTP_STAT_INCR(sctps_naglequeued);
13670 		nagle_applies = 1;
13671 	} else {
13672 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13673 			if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13674 				sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13675 		}
13676 		SCTP_STAT_INCR(sctps_naglesent);
13677 		nagle_applies = 0;
13678 	}
13679 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13680 		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13681 		    nagle_applies, un_sent);
13682 		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13683 		    stcb->asoc.total_flight,
13684 		    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13685 	}
13686 	if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13687 		/* we can attempt to send too. */
13688 		if (hold_tcblock == 0) {
13689 			/*
13690 			 * If there is activity recv'ing sacks no need to
13691 			 * send
13692 			 */
13693 			if (SCTP_TCB_TRYLOCK(stcb)) {
13694 				sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13695 				hold_tcblock = 1;
13696 			}
13697 		} else {
13698 			sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13699 		}
13700 	} else if ((queue_only == 0) &&
13701 		    (stcb->asoc.peers_rwnd == 0) &&
13702 	    (stcb->asoc.total_flight == 0)) {
13703 		/* We get to have a probe outstanding */
13704 		if (hold_tcblock == 0) {
13705 			hold_tcblock = 1;
13706 			SCTP_TCB_LOCK(stcb);
13707 		}
13708 		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13709 	} else if (some_on_control) {
13710 		int num_out, reason, frag_point;
13711 
13712 		/* Here we do control only */
13713 		if (hold_tcblock == 0) {
13714 			hold_tcblock = 1;
13715 			SCTP_TCB_LOCK(stcb);
13716 		}
13717 		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13718 		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13719 		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13720 	}
13721 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13722 	    queue_only, stcb->asoc.peers_rwnd, un_sent,
13723 	    stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13724 	    stcb->asoc.total_output_queue_size, error);
13725 
13726 out:
13727 out_unlocked:
13728 
13729 	if (local_soresv && stcb) {
13730 		atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13731 	}
13732 	if (create_lock_applied) {
13733 		SCTP_ASOC_CREATE_UNLOCK(inp);
13734 	}
13735 	if ((stcb) && hold_tcblock) {
13736 		SCTP_TCB_UNLOCK(stcb);
13737 	}
13738 	if (stcb && free_cnt_applied) {
13739 		atomic_add_int(&stcb->asoc.refcnt, -1);
13740 	}
13741 #ifdef INVARIANTS
13742 	if (stcb) {
13743 		if (mtx_owned(&stcb->tcb_mtx)) {
13744 			panic("Leaving with tcb mtx owned?");
13745 		}
13746 		if (mtx_owned(&stcb->tcb_send_mtx)) {
13747 			panic("Leaving with tcb send mtx owned?");
13748 		}
13749 	}
13750 #endif
13751 	if (top) {
13752 		sctp_m_freem(top);
13753 	}
13754 	if (control) {
13755 		sctp_m_freem(control);
13756 	}
13757 	return (error);
13758 }
13759 
13760 
13761 /*
13762  * generate an AUTHentication chunk, if required
13763  */
13764 struct mbuf *
13765 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13766     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13767     struct sctp_tcb *stcb, uint8_t chunk)
13768 {
13769 	struct mbuf *m_auth;
13770 	struct sctp_auth_chunk *auth;
13771 	int chunk_len;
13772 	struct mbuf *cn;
13773 
13774 	if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13775 	    (stcb == NULL))
13776 		return (m);
13777 
13778 	if (stcb->asoc.auth_supported == 0) {
13779 		return (m);
13780 	}
13781 	/* does the requested chunk require auth? */
13782 	if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13783 		return (m);
13784 	}
13785 	m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13786 	if (m_auth == NULL) {
13787 		/* no mbuf's */
13788 		return (m);
13789 	}
13790 	/* reserve some space if this will be the first mbuf */
13791 	if (m == NULL)
13792 		SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13793 	/* fill in the AUTH chunk details */
13794 	auth = mtod(m_auth, struct sctp_auth_chunk *);
13795 	memset(auth, 0, sizeof(*auth));
13796 	auth->ch.chunk_type = SCTP_AUTHENTICATION;
13797 	auth->ch.chunk_flags = 0;
13798 	chunk_len = sizeof(*auth) +
13799 	    sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13800 	auth->ch.chunk_length = htons(chunk_len);
13801 	auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13802 	/* key id and hmac digest will be computed and filled in upon send */
13803 
13804 	/* save the offset where the auth was inserted into the chain */
13805 	*offset = 0;
13806 	for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13807 		*offset += SCTP_BUF_LEN(cn);
13808 	}
13809 
13810 	/* update length and return pointer to the auth chunk */
13811 	SCTP_BUF_LEN(m_auth) = chunk_len;
13812 	m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13813 	if (auth_ret != NULL)
13814 		*auth_ret = auth;
13815 
13816 	return (m);
13817 }
13818 
13819 #ifdef INET6
13820 int
13821 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13822 {
13823 	struct nd_prefix *pfx = NULL;
13824 	struct nd_pfxrouter *pfxrtr = NULL;
13825 	struct sockaddr_in6 gw6;
13826 
13827 	if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13828 		return (0);
13829 
13830 	/* get prefix entry of address */
13831 	ND6_RLOCK();
13832 	LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13833 		if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13834 			continue;
13835 		if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13836 		    &src6->sin6_addr, &pfx->ndpr_mask))
13837 			break;
13838 	}
13839 	/* no prefix entry in the prefix list */
13840 	if (pfx == NULL) {
13841 		ND6_RUNLOCK();
13842 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13843 		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13844 		return (0);
13845 	}
13846 
13847 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13848 	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13849 
13850 	/* search installed gateway from prefix entry */
13851 	LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13852 		memset(&gw6, 0, sizeof(struct sockaddr_in6));
13853 		gw6.sin6_family = AF_INET6;
13854 		gw6.sin6_len = sizeof(struct sockaddr_in6);
13855 		memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13856 		    sizeof(struct in6_addr));
13857 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13858 		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13859 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13860 		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13861 		if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13862 			ND6_RUNLOCK();
13863 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13864 			return (1);
13865 		}
13866 	}
13867 	ND6_RUNLOCK();
13868 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13869 	return (0);
13870 }
13871 #endif
13872 
13873 int
13874 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13875 {
13876 #ifdef INET
13877 	struct sockaddr_in *sin, *mask;
13878 	struct ifaddr *ifa;
13879 	struct in_addr srcnetaddr, gwnetaddr;
13880 
13881 	if (ro == NULL || ro->ro_rt == NULL ||
13882 	    sifa->address.sa.sa_family != AF_INET) {
13883 		return (0);
13884 	}
13885 	ifa = (struct ifaddr *)sifa->ifa;
13886 	mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13887 	sin = &sifa->address.sin;
13888 	srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13889 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13890 	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13891 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13892 
13893 	sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13894 	gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13895 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13896 	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13897 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13898 	if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13899 		return (1);
13900 	}
13901 #endif
13902 	return (0);
13903 }
13904