xref: /freebsd/sys/netinet/sctp_output.c (revision 076ad2f836d5f49dc1375f1677335a48fe0d4b82)
1 /*-
2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions are met:
8  *
9  * a) Redistributions of source code must retain the above copyright notice,
10  *    this list of conditions and the following disclaimer.
11  *
12  * b) Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in
14  *    the documentation and/or other materials provided with the distribution.
15  *
16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
17  *    contributors may be used to endorse or promote products derived
18  *    from this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30  * THE POSSIBILITY OF SUCH DAMAGE.
31  */
32 
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35 
36 #include <netinet/sctp_os.h>
37 #include <sys/proc.h>
38 #include <netinet/sctp_var.h>
39 #include <netinet/sctp_sysctl.h>
40 #include <netinet/sctp_header.h>
41 #include <netinet/sctp_pcb.h>
42 #include <netinet/sctputil.h>
43 #include <netinet/sctp_output.h>
44 #include <netinet/sctp_uio.h>
45 #include <netinet/sctputil.h>
46 #include <netinet/sctp_auth.h>
47 #include <netinet/sctp_timer.h>
48 #include <netinet/sctp_asconf.h>
49 #include <netinet/sctp_indata.h>
50 #include <netinet/sctp_bsd_addr.h>
51 #include <netinet/sctp_input.h>
52 #include <netinet/sctp_crc32.h>
53 #if defined(INET) || defined(INET6)
54 #include <netinet/udp.h>
55 #endif
56 #include <netinet/udp_var.h>
57 #include <machine/in_cksum.h>
58 
59 
60 
61 #define SCTP_MAX_GAPS_INARRAY 4
62 struct sack_track {
63 	uint8_t right_edge;	/* mergable on the right edge */
64 	uint8_t left_edge;	/* mergable on the left edge */
65 	uint8_t num_entries;
66 	uint8_t spare;
67 	struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
68 };
69 
70 const struct sack_track sack_array[256] = {
71 	{0, 0, 0, 0,		/* 0x00 */
72 		{{0, 0},
73 		{0, 0},
74 		{0, 0},
75 		{0, 0}
76 		}
77 	},
78 	{1, 0, 1, 0,		/* 0x01 */
79 		{{0, 0},
80 		{0, 0},
81 		{0, 0},
82 		{0, 0}
83 		}
84 	},
85 	{0, 0, 1, 0,		/* 0x02 */
86 		{{1, 1},
87 		{0, 0},
88 		{0, 0},
89 		{0, 0}
90 		}
91 	},
92 	{1, 0, 1, 0,		/* 0x03 */
93 		{{0, 1},
94 		{0, 0},
95 		{0, 0},
96 		{0, 0}
97 		}
98 	},
99 	{0, 0, 1, 0,		/* 0x04 */
100 		{{2, 2},
101 		{0, 0},
102 		{0, 0},
103 		{0, 0}
104 		}
105 	},
106 	{1, 0, 2, 0,		/* 0x05 */
107 		{{0, 0},
108 		{2, 2},
109 		{0, 0},
110 		{0, 0}
111 		}
112 	},
113 	{0, 0, 1, 0,		/* 0x06 */
114 		{{1, 2},
115 		{0, 0},
116 		{0, 0},
117 		{0, 0}
118 		}
119 	},
120 	{1, 0, 1, 0,		/* 0x07 */
121 		{{0, 2},
122 		{0, 0},
123 		{0, 0},
124 		{0, 0}
125 		}
126 	},
127 	{0, 0, 1, 0,		/* 0x08 */
128 		{{3, 3},
129 		{0, 0},
130 		{0, 0},
131 		{0, 0}
132 		}
133 	},
134 	{1, 0, 2, 0,		/* 0x09 */
135 		{{0, 0},
136 		{3, 3},
137 		{0, 0},
138 		{0, 0}
139 		}
140 	},
141 	{0, 0, 2, 0,		/* 0x0a */
142 		{{1, 1},
143 		{3, 3},
144 		{0, 0},
145 		{0, 0}
146 		}
147 	},
148 	{1, 0, 2, 0,		/* 0x0b */
149 		{{0, 1},
150 		{3, 3},
151 		{0, 0},
152 		{0, 0}
153 		}
154 	},
155 	{0, 0, 1, 0,		/* 0x0c */
156 		{{2, 3},
157 		{0, 0},
158 		{0, 0},
159 		{0, 0}
160 		}
161 	},
162 	{1, 0, 2, 0,		/* 0x0d */
163 		{{0, 0},
164 		{2, 3},
165 		{0, 0},
166 		{0, 0}
167 		}
168 	},
169 	{0, 0, 1, 0,		/* 0x0e */
170 		{{1, 3},
171 		{0, 0},
172 		{0, 0},
173 		{0, 0}
174 		}
175 	},
176 	{1, 0, 1, 0,		/* 0x0f */
177 		{{0, 3},
178 		{0, 0},
179 		{0, 0},
180 		{0, 0}
181 		}
182 	},
183 	{0, 0, 1, 0,		/* 0x10 */
184 		{{4, 4},
185 		{0, 0},
186 		{0, 0},
187 		{0, 0}
188 		}
189 	},
190 	{1, 0, 2, 0,		/* 0x11 */
191 		{{0, 0},
192 		{4, 4},
193 		{0, 0},
194 		{0, 0}
195 		}
196 	},
197 	{0, 0, 2, 0,		/* 0x12 */
198 		{{1, 1},
199 		{4, 4},
200 		{0, 0},
201 		{0, 0}
202 		}
203 	},
204 	{1, 0, 2, 0,		/* 0x13 */
205 		{{0, 1},
206 		{4, 4},
207 		{0, 0},
208 		{0, 0}
209 		}
210 	},
211 	{0, 0, 2, 0,		/* 0x14 */
212 		{{2, 2},
213 		{4, 4},
214 		{0, 0},
215 		{0, 0}
216 		}
217 	},
218 	{1, 0, 3, 0,		/* 0x15 */
219 		{{0, 0},
220 		{2, 2},
221 		{4, 4},
222 		{0, 0}
223 		}
224 	},
225 	{0, 0, 2, 0,		/* 0x16 */
226 		{{1, 2},
227 		{4, 4},
228 		{0, 0},
229 		{0, 0}
230 		}
231 	},
232 	{1, 0, 2, 0,		/* 0x17 */
233 		{{0, 2},
234 		{4, 4},
235 		{0, 0},
236 		{0, 0}
237 		}
238 	},
239 	{0, 0, 1, 0,		/* 0x18 */
240 		{{3, 4},
241 		{0, 0},
242 		{0, 0},
243 		{0, 0}
244 		}
245 	},
246 	{1, 0, 2, 0,		/* 0x19 */
247 		{{0, 0},
248 		{3, 4},
249 		{0, 0},
250 		{0, 0}
251 		}
252 	},
253 	{0, 0, 2, 0,		/* 0x1a */
254 		{{1, 1},
255 		{3, 4},
256 		{0, 0},
257 		{0, 0}
258 		}
259 	},
260 	{1, 0, 2, 0,		/* 0x1b */
261 		{{0, 1},
262 		{3, 4},
263 		{0, 0},
264 		{0, 0}
265 		}
266 	},
267 	{0, 0, 1, 0,		/* 0x1c */
268 		{{2, 4},
269 		{0, 0},
270 		{0, 0},
271 		{0, 0}
272 		}
273 	},
274 	{1, 0, 2, 0,		/* 0x1d */
275 		{{0, 0},
276 		{2, 4},
277 		{0, 0},
278 		{0, 0}
279 		}
280 	},
281 	{0, 0, 1, 0,		/* 0x1e */
282 		{{1, 4},
283 		{0, 0},
284 		{0, 0},
285 		{0, 0}
286 		}
287 	},
288 	{1, 0, 1, 0,		/* 0x1f */
289 		{{0, 4},
290 		{0, 0},
291 		{0, 0},
292 		{0, 0}
293 		}
294 	},
295 	{0, 0, 1, 0,		/* 0x20 */
296 		{{5, 5},
297 		{0, 0},
298 		{0, 0},
299 		{0, 0}
300 		}
301 	},
302 	{1, 0, 2, 0,		/* 0x21 */
303 		{{0, 0},
304 		{5, 5},
305 		{0, 0},
306 		{0, 0}
307 		}
308 	},
309 	{0, 0, 2, 0,		/* 0x22 */
310 		{{1, 1},
311 		{5, 5},
312 		{0, 0},
313 		{0, 0}
314 		}
315 	},
316 	{1, 0, 2, 0,		/* 0x23 */
317 		{{0, 1},
318 		{5, 5},
319 		{0, 0},
320 		{0, 0}
321 		}
322 	},
323 	{0, 0, 2, 0,		/* 0x24 */
324 		{{2, 2},
325 		{5, 5},
326 		{0, 0},
327 		{0, 0}
328 		}
329 	},
330 	{1, 0, 3, 0,		/* 0x25 */
331 		{{0, 0},
332 		{2, 2},
333 		{5, 5},
334 		{0, 0}
335 		}
336 	},
337 	{0, 0, 2, 0,		/* 0x26 */
338 		{{1, 2},
339 		{5, 5},
340 		{0, 0},
341 		{0, 0}
342 		}
343 	},
344 	{1, 0, 2, 0,		/* 0x27 */
345 		{{0, 2},
346 		{5, 5},
347 		{0, 0},
348 		{0, 0}
349 		}
350 	},
351 	{0, 0, 2, 0,		/* 0x28 */
352 		{{3, 3},
353 		{5, 5},
354 		{0, 0},
355 		{0, 0}
356 		}
357 	},
358 	{1, 0, 3, 0,		/* 0x29 */
359 		{{0, 0},
360 		{3, 3},
361 		{5, 5},
362 		{0, 0}
363 		}
364 	},
365 	{0, 0, 3, 0,		/* 0x2a */
366 		{{1, 1},
367 		{3, 3},
368 		{5, 5},
369 		{0, 0}
370 		}
371 	},
372 	{1, 0, 3, 0,		/* 0x2b */
373 		{{0, 1},
374 		{3, 3},
375 		{5, 5},
376 		{0, 0}
377 		}
378 	},
379 	{0, 0, 2, 0,		/* 0x2c */
380 		{{2, 3},
381 		{5, 5},
382 		{0, 0},
383 		{0, 0}
384 		}
385 	},
386 	{1, 0, 3, 0,		/* 0x2d */
387 		{{0, 0},
388 		{2, 3},
389 		{5, 5},
390 		{0, 0}
391 		}
392 	},
393 	{0, 0, 2, 0,		/* 0x2e */
394 		{{1, 3},
395 		{5, 5},
396 		{0, 0},
397 		{0, 0}
398 		}
399 	},
400 	{1, 0, 2, 0,		/* 0x2f */
401 		{{0, 3},
402 		{5, 5},
403 		{0, 0},
404 		{0, 0}
405 		}
406 	},
407 	{0, 0, 1, 0,		/* 0x30 */
408 		{{4, 5},
409 		{0, 0},
410 		{0, 0},
411 		{0, 0}
412 		}
413 	},
414 	{1, 0, 2, 0,		/* 0x31 */
415 		{{0, 0},
416 		{4, 5},
417 		{0, 0},
418 		{0, 0}
419 		}
420 	},
421 	{0, 0, 2, 0,		/* 0x32 */
422 		{{1, 1},
423 		{4, 5},
424 		{0, 0},
425 		{0, 0}
426 		}
427 	},
428 	{1, 0, 2, 0,		/* 0x33 */
429 		{{0, 1},
430 		{4, 5},
431 		{0, 0},
432 		{0, 0}
433 		}
434 	},
435 	{0, 0, 2, 0,		/* 0x34 */
436 		{{2, 2},
437 		{4, 5},
438 		{0, 0},
439 		{0, 0}
440 		}
441 	},
442 	{1, 0, 3, 0,		/* 0x35 */
443 		{{0, 0},
444 		{2, 2},
445 		{4, 5},
446 		{0, 0}
447 		}
448 	},
449 	{0, 0, 2, 0,		/* 0x36 */
450 		{{1, 2},
451 		{4, 5},
452 		{0, 0},
453 		{0, 0}
454 		}
455 	},
456 	{1, 0, 2, 0,		/* 0x37 */
457 		{{0, 2},
458 		{4, 5},
459 		{0, 0},
460 		{0, 0}
461 		}
462 	},
463 	{0, 0, 1, 0,		/* 0x38 */
464 		{{3, 5},
465 		{0, 0},
466 		{0, 0},
467 		{0, 0}
468 		}
469 	},
470 	{1, 0, 2, 0,		/* 0x39 */
471 		{{0, 0},
472 		{3, 5},
473 		{0, 0},
474 		{0, 0}
475 		}
476 	},
477 	{0, 0, 2, 0,		/* 0x3a */
478 		{{1, 1},
479 		{3, 5},
480 		{0, 0},
481 		{0, 0}
482 		}
483 	},
484 	{1, 0, 2, 0,		/* 0x3b */
485 		{{0, 1},
486 		{3, 5},
487 		{0, 0},
488 		{0, 0}
489 		}
490 	},
491 	{0, 0, 1, 0,		/* 0x3c */
492 		{{2, 5},
493 		{0, 0},
494 		{0, 0},
495 		{0, 0}
496 		}
497 	},
498 	{1, 0, 2, 0,		/* 0x3d */
499 		{{0, 0},
500 		{2, 5},
501 		{0, 0},
502 		{0, 0}
503 		}
504 	},
505 	{0, 0, 1, 0,		/* 0x3e */
506 		{{1, 5},
507 		{0, 0},
508 		{0, 0},
509 		{0, 0}
510 		}
511 	},
512 	{1, 0, 1, 0,		/* 0x3f */
513 		{{0, 5},
514 		{0, 0},
515 		{0, 0},
516 		{0, 0}
517 		}
518 	},
519 	{0, 0, 1, 0,		/* 0x40 */
520 		{{6, 6},
521 		{0, 0},
522 		{0, 0},
523 		{0, 0}
524 		}
525 	},
526 	{1, 0, 2, 0,		/* 0x41 */
527 		{{0, 0},
528 		{6, 6},
529 		{0, 0},
530 		{0, 0}
531 		}
532 	},
533 	{0, 0, 2, 0,		/* 0x42 */
534 		{{1, 1},
535 		{6, 6},
536 		{0, 0},
537 		{0, 0}
538 		}
539 	},
540 	{1, 0, 2, 0,		/* 0x43 */
541 		{{0, 1},
542 		{6, 6},
543 		{0, 0},
544 		{0, 0}
545 		}
546 	},
547 	{0, 0, 2, 0,		/* 0x44 */
548 		{{2, 2},
549 		{6, 6},
550 		{0, 0},
551 		{0, 0}
552 		}
553 	},
554 	{1, 0, 3, 0,		/* 0x45 */
555 		{{0, 0},
556 		{2, 2},
557 		{6, 6},
558 		{0, 0}
559 		}
560 	},
561 	{0, 0, 2, 0,		/* 0x46 */
562 		{{1, 2},
563 		{6, 6},
564 		{0, 0},
565 		{0, 0}
566 		}
567 	},
568 	{1, 0, 2, 0,		/* 0x47 */
569 		{{0, 2},
570 		{6, 6},
571 		{0, 0},
572 		{0, 0}
573 		}
574 	},
575 	{0, 0, 2, 0,		/* 0x48 */
576 		{{3, 3},
577 		{6, 6},
578 		{0, 0},
579 		{0, 0}
580 		}
581 	},
582 	{1, 0, 3, 0,		/* 0x49 */
583 		{{0, 0},
584 		{3, 3},
585 		{6, 6},
586 		{0, 0}
587 		}
588 	},
589 	{0, 0, 3, 0,		/* 0x4a */
590 		{{1, 1},
591 		{3, 3},
592 		{6, 6},
593 		{0, 0}
594 		}
595 	},
596 	{1, 0, 3, 0,		/* 0x4b */
597 		{{0, 1},
598 		{3, 3},
599 		{6, 6},
600 		{0, 0}
601 		}
602 	},
603 	{0, 0, 2, 0,		/* 0x4c */
604 		{{2, 3},
605 		{6, 6},
606 		{0, 0},
607 		{0, 0}
608 		}
609 	},
610 	{1, 0, 3, 0,		/* 0x4d */
611 		{{0, 0},
612 		{2, 3},
613 		{6, 6},
614 		{0, 0}
615 		}
616 	},
617 	{0, 0, 2, 0,		/* 0x4e */
618 		{{1, 3},
619 		{6, 6},
620 		{0, 0},
621 		{0, 0}
622 		}
623 	},
624 	{1, 0, 2, 0,		/* 0x4f */
625 		{{0, 3},
626 		{6, 6},
627 		{0, 0},
628 		{0, 0}
629 		}
630 	},
631 	{0, 0, 2, 0,		/* 0x50 */
632 		{{4, 4},
633 		{6, 6},
634 		{0, 0},
635 		{0, 0}
636 		}
637 	},
638 	{1, 0, 3, 0,		/* 0x51 */
639 		{{0, 0},
640 		{4, 4},
641 		{6, 6},
642 		{0, 0}
643 		}
644 	},
645 	{0, 0, 3, 0,		/* 0x52 */
646 		{{1, 1},
647 		{4, 4},
648 		{6, 6},
649 		{0, 0}
650 		}
651 	},
652 	{1, 0, 3, 0,		/* 0x53 */
653 		{{0, 1},
654 		{4, 4},
655 		{6, 6},
656 		{0, 0}
657 		}
658 	},
659 	{0, 0, 3, 0,		/* 0x54 */
660 		{{2, 2},
661 		{4, 4},
662 		{6, 6},
663 		{0, 0}
664 		}
665 	},
666 	{1, 0, 4, 0,		/* 0x55 */
667 		{{0, 0},
668 		{2, 2},
669 		{4, 4},
670 		{6, 6}
671 		}
672 	},
673 	{0, 0, 3, 0,		/* 0x56 */
674 		{{1, 2},
675 		{4, 4},
676 		{6, 6},
677 		{0, 0}
678 		}
679 	},
680 	{1, 0, 3, 0,		/* 0x57 */
681 		{{0, 2},
682 		{4, 4},
683 		{6, 6},
684 		{0, 0}
685 		}
686 	},
687 	{0, 0, 2, 0,		/* 0x58 */
688 		{{3, 4},
689 		{6, 6},
690 		{0, 0},
691 		{0, 0}
692 		}
693 	},
694 	{1, 0, 3, 0,		/* 0x59 */
695 		{{0, 0},
696 		{3, 4},
697 		{6, 6},
698 		{0, 0}
699 		}
700 	},
701 	{0, 0, 3, 0,		/* 0x5a */
702 		{{1, 1},
703 		{3, 4},
704 		{6, 6},
705 		{0, 0}
706 		}
707 	},
708 	{1, 0, 3, 0,		/* 0x5b */
709 		{{0, 1},
710 		{3, 4},
711 		{6, 6},
712 		{0, 0}
713 		}
714 	},
715 	{0, 0, 2, 0,		/* 0x5c */
716 		{{2, 4},
717 		{6, 6},
718 		{0, 0},
719 		{0, 0}
720 		}
721 	},
722 	{1, 0, 3, 0,		/* 0x5d */
723 		{{0, 0},
724 		{2, 4},
725 		{6, 6},
726 		{0, 0}
727 		}
728 	},
729 	{0, 0, 2, 0,		/* 0x5e */
730 		{{1, 4},
731 		{6, 6},
732 		{0, 0},
733 		{0, 0}
734 		}
735 	},
736 	{1, 0, 2, 0,		/* 0x5f */
737 		{{0, 4},
738 		{6, 6},
739 		{0, 0},
740 		{0, 0}
741 		}
742 	},
743 	{0, 0, 1, 0,		/* 0x60 */
744 		{{5, 6},
745 		{0, 0},
746 		{0, 0},
747 		{0, 0}
748 		}
749 	},
750 	{1, 0, 2, 0,		/* 0x61 */
751 		{{0, 0},
752 		{5, 6},
753 		{0, 0},
754 		{0, 0}
755 		}
756 	},
757 	{0, 0, 2, 0,		/* 0x62 */
758 		{{1, 1},
759 		{5, 6},
760 		{0, 0},
761 		{0, 0}
762 		}
763 	},
764 	{1, 0, 2, 0,		/* 0x63 */
765 		{{0, 1},
766 		{5, 6},
767 		{0, 0},
768 		{0, 0}
769 		}
770 	},
771 	{0, 0, 2, 0,		/* 0x64 */
772 		{{2, 2},
773 		{5, 6},
774 		{0, 0},
775 		{0, 0}
776 		}
777 	},
778 	{1, 0, 3, 0,		/* 0x65 */
779 		{{0, 0},
780 		{2, 2},
781 		{5, 6},
782 		{0, 0}
783 		}
784 	},
785 	{0, 0, 2, 0,		/* 0x66 */
786 		{{1, 2},
787 		{5, 6},
788 		{0, 0},
789 		{0, 0}
790 		}
791 	},
792 	{1, 0, 2, 0,		/* 0x67 */
793 		{{0, 2},
794 		{5, 6},
795 		{0, 0},
796 		{0, 0}
797 		}
798 	},
799 	{0, 0, 2, 0,		/* 0x68 */
800 		{{3, 3},
801 		{5, 6},
802 		{0, 0},
803 		{0, 0}
804 		}
805 	},
806 	{1, 0, 3, 0,		/* 0x69 */
807 		{{0, 0},
808 		{3, 3},
809 		{5, 6},
810 		{0, 0}
811 		}
812 	},
813 	{0, 0, 3, 0,		/* 0x6a */
814 		{{1, 1},
815 		{3, 3},
816 		{5, 6},
817 		{0, 0}
818 		}
819 	},
820 	{1, 0, 3, 0,		/* 0x6b */
821 		{{0, 1},
822 		{3, 3},
823 		{5, 6},
824 		{0, 0}
825 		}
826 	},
827 	{0, 0, 2, 0,		/* 0x6c */
828 		{{2, 3},
829 		{5, 6},
830 		{0, 0},
831 		{0, 0}
832 		}
833 	},
834 	{1, 0, 3, 0,		/* 0x6d */
835 		{{0, 0},
836 		{2, 3},
837 		{5, 6},
838 		{0, 0}
839 		}
840 	},
841 	{0, 0, 2, 0,		/* 0x6e */
842 		{{1, 3},
843 		{5, 6},
844 		{0, 0},
845 		{0, 0}
846 		}
847 	},
848 	{1, 0, 2, 0,		/* 0x6f */
849 		{{0, 3},
850 		{5, 6},
851 		{0, 0},
852 		{0, 0}
853 		}
854 	},
855 	{0, 0, 1, 0,		/* 0x70 */
856 		{{4, 6},
857 		{0, 0},
858 		{0, 0},
859 		{0, 0}
860 		}
861 	},
862 	{1, 0, 2, 0,		/* 0x71 */
863 		{{0, 0},
864 		{4, 6},
865 		{0, 0},
866 		{0, 0}
867 		}
868 	},
869 	{0, 0, 2, 0,		/* 0x72 */
870 		{{1, 1},
871 		{4, 6},
872 		{0, 0},
873 		{0, 0}
874 		}
875 	},
876 	{1, 0, 2, 0,		/* 0x73 */
877 		{{0, 1},
878 		{4, 6},
879 		{0, 0},
880 		{0, 0}
881 		}
882 	},
883 	{0, 0, 2, 0,		/* 0x74 */
884 		{{2, 2},
885 		{4, 6},
886 		{0, 0},
887 		{0, 0}
888 		}
889 	},
890 	{1, 0, 3, 0,		/* 0x75 */
891 		{{0, 0},
892 		{2, 2},
893 		{4, 6},
894 		{0, 0}
895 		}
896 	},
897 	{0, 0, 2, 0,		/* 0x76 */
898 		{{1, 2},
899 		{4, 6},
900 		{0, 0},
901 		{0, 0}
902 		}
903 	},
904 	{1, 0, 2, 0,		/* 0x77 */
905 		{{0, 2},
906 		{4, 6},
907 		{0, 0},
908 		{0, 0}
909 		}
910 	},
911 	{0, 0, 1, 0,		/* 0x78 */
912 		{{3, 6},
913 		{0, 0},
914 		{0, 0},
915 		{0, 0}
916 		}
917 	},
918 	{1, 0, 2, 0,		/* 0x79 */
919 		{{0, 0},
920 		{3, 6},
921 		{0, 0},
922 		{0, 0}
923 		}
924 	},
925 	{0, 0, 2, 0,		/* 0x7a */
926 		{{1, 1},
927 		{3, 6},
928 		{0, 0},
929 		{0, 0}
930 		}
931 	},
932 	{1, 0, 2, 0,		/* 0x7b */
933 		{{0, 1},
934 		{3, 6},
935 		{0, 0},
936 		{0, 0}
937 		}
938 	},
939 	{0, 0, 1, 0,		/* 0x7c */
940 		{{2, 6},
941 		{0, 0},
942 		{0, 0},
943 		{0, 0}
944 		}
945 	},
946 	{1, 0, 2, 0,		/* 0x7d */
947 		{{0, 0},
948 		{2, 6},
949 		{0, 0},
950 		{0, 0}
951 		}
952 	},
953 	{0, 0, 1, 0,		/* 0x7e */
954 		{{1, 6},
955 		{0, 0},
956 		{0, 0},
957 		{0, 0}
958 		}
959 	},
960 	{1, 0, 1, 0,		/* 0x7f */
961 		{{0, 6},
962 		{0, 0},
963 		{0, 0},
964 		{0, 0}
965 		}
966 	},
967 	{0, 1, 1, 0,		/* 0x80 */
968 		{{7, 7},
969 		{0, 0},
970 		{0, 0},
971 		{0, 0}
972 		}
973 	},
974 	{1, 1, 2, 0,		/* 0x81 */
975 		{{0, 0},
976 		{7, 7},
977 		{0, 0},
978 		{0, 0}
979 		}
980 	},
981 	{0, 1, 2, 0,		/* 0x82 */
982 		{{1, 1},
983 		{7, 7},
984 		{0, 0},
985 		{0, 0}
986 		}
987 	},
988 	{1, 1, 2, 0,		/* 0x83 */
989 		{{0, 1},
990 		{7, 7},
991 		{0, 0},
992 		{0, 0}
993 		}
994 	},
995 	{0, 1, 2, 0,		/* 0x84 */
996 		{{2, 2},
997 		{7, 7},
998 		{0, 0},
999 		{0, 0}
1000 		}
1001 	},
1002 	{1, 1, 3, 0,		/* 0x85 */
1003 		{{0, 0},
1004 		{2, 2},
1005 		{7, 7},
1006 		{0, 0}
1007 		}
1008 	},
1009 	{0, 1, 2, 0,		/* 0x86 */
1010 		{{1, 2},
1011 		{7, 7},
1012 		{0, 0},
1013 		{0, 0}
1014 		}
1015 	},
1016 	{1, 1, 2, 0,		/* 0x87 */
1017 		{{0, 2},
1018 		{7, 7},
1019 		{0, 0},
1020 		{0, 0}
1021 		}
1022 	},
1023 	{0, 1, 2, 0,		/* 0x88 */
1024 		{{3, 3},
1025 		{7, 7},
1026 		{0, 0},
1027 		{0, 0}
1028 		}
1029 	},
1030 	{1, 1, 3, 0,		/* 0x89 */
1031 		{{0, 0},
1032 		{3, 3},
1033 		{7, 7},
1034 		{0, 0}
1035 		}
1036 	},
1037 	{0, 1, 3, 0,		/* 0x8a */
1038 		{{1, 1},
1039 		{3, 3},
1040 		{7, 7},
1041 		{0, 0}
1042 		}
1043 	},
1044 	{1, 1, 3, 0,		/* 0x8b */
1045 		{{0, 1},
1046 		{3, 3},
1047 		{7, 7},
1048 		{0, 0}
1049 		}
1050 	},
1051 	{0, 1, 2, 0,		/* 0x8c */
1052 		{{2, 3},
1053 		{7, 7},
1054 		{0, 0},
1055 		{0, 0}
1056 		}
1057 	},
1058 	{1, 1, 3, 0,		/* 0x8d */
1059 		{{0, 0},
1060 		{2, 3},
1061 		{7, 7},
1062 		{0, 0}
1063 		}
1064 	},
1065 	{0, 1, 2, 0,		/* 0x8e */
1066 		{{1, 3},
1067 		{7, 7},
1068 		{0, 0},
1069 		{0, 0}
1070 		}
1071 	},
1072 	{1, 1, 2, 0,		/* 0x8f */
1073 		{{0, 3},
1074 		{7, 7},
1075 		{0, 0},
1076 		{0, 0}
1077 		}
1078 	},
1079 	{0, 1, 2, 0,		/* 0x90 */
1080 		{{4, 4},
1081 		{7, 7},
1082 		{0, 0},
1083 		{0, 0}
1084 		}
1085 	},
1086 	{1, 1, 3, 0,		/* 0x91 */
1087 		{{0, 0},
1088 		{4, 4},
1089 		{7, 7},
1090 		{0, 0}
1091 		}
1092 	},
1093 	{0, 1, 3, 0,		/* 0x92 */
1094 		{{1, 1},
1095 		{4, 4},
1096 		{7, 7},
1097 		{0, 0}
1098 		}
1099 	},
1100 	{1, 1, 3, 0,		/* 0x93 */
1101 		{{0, 1},
1102 		{4, 4},
1103 		{7, 7},
1104 		{0, 0}
1105 		}
1106 	},
1107 	{0, 1, 3, 0,		/* 0x94 */
1108 		{{2, 2},
1109 		{4, 4},
1110 		{7, 7},
1111 		{0, 0}
1112 		}
1113 	},
1114 	{1, 1, 4, 0,		/* 0x95 */
1115 		{{0, 0},
1116 		{2, 2},
1117 		{4, 4},
1118 		{7, 7}
1119 		}
1120 	},
1121 	{0, 1, 3, 0,		/* 0x96 */
1122 		{{1, 2},
1123 		{4, 4},
1124 		{7, 7},
1125 		{0, 0}
1126 		}
1127 	},
1128 	{1, 1, 3, 0,		/* 0x97 */
1129 		{{0, 2},
1130 		{4, 4},
1131 		{7, 7},
1132 		{0, 0}
1133 		}
1134 	},
1135 	{0, 1, 2, 0,		/* 0x98 */
1136 		{{3, 4},
1137 		{7, 7},
1138 		{0, 0},
1139 		{0, 0}
1140 		}
1141 	},
1142 	{1, 1, 3, 0,		/* 0x99 */
1143 		{{0, 0},
1144 		{3, 4},
1145 		{7, 7},
1146 		{0, 0}
1147 		}
1148 	},
1149 	{0, 1, 3, 0,		/* 0x9a */
1150 		{{1, 1},
1151 		{3, 4},
1152 		{7, 7},
1153 		{0, 0}
1154 		}
1155 	},
1156 	{1, 1, 3, 0,		/* 0x9b */
1157 		{{0, 1},
1158 		{3, 4},
1159 		{7, 7},
1160 		{0, 0}
1161 		}
1162 	},
1163 	{0, 1, 2, 0,		/* 0x9c */
1164 		{{2, 4},
1165 		{7, 7},
1166 		{0, 0},
1167 		{0, 0}
1168 		}
1169 	},
1170 	{1, 1, 3, 0,		/* 0x9d */
1171 		{{0, 0},
1172 		{2, 4},
1173 		{7, 7},
1174 		{0, 0}
1175 		}
1176 	},
1177 	{0, 1, 2, 0,		/* 0x9e */
1178 		{{1, 4},
1179 		{7, 7},
1180 		{0, 0},
1181 		{0, 0}
1182 		}
1183 	},
1184 	{1, 1, 2, 0,		/* 0x9f */
1185 		{{0, 4},
1186 		{7, 7},
1187 		{0, 0},
1188 		{0, 0}
1189 		}
1190 	},
1191 	{0, 1, 2, 0,		/* 0xa0 */
1192 		{{5, 5},
1193 		{7, 7},
1194 		{0, 0},
1195 		{0, 0}
1196 		}
1197 	},
1198 	{1, 1, 3, 0,		/* 0xa1 */
1199 		{{0, 0},
1200 		{5, 5},
1201 		{7, 7},
1202 		{0, 0}
1203 		}
1204 	},
1205 	{0, 1, 3, 0,		/* 0xa2 */
1206 		{{1, 1},
1207 		{5, 5},
1208 		{7, 7},
1209 		{0, 0}
1210 		}
1211 	},
1212 	{1, 1, 3, 0,		/* 0xa3 */
1213 		{{0, 1},
1214 		{5, 5},
1215 		{7, 7},
1216 		{0, 0}
1217 		}
1218 	},
1219 	{0, 1, 3, 0,		/* 0xa4 */
1220 		{{2, 2},
1221 		{5, 5},
1222 		{7, 7},
1223 		{0, 0}
1224 		}
1225 	},
1226 	{1, 1, 4, 0,		/* 0xa5 */
1227 		{{0, 0},
1228 		{2, 2},
1229 		{5, 5},
1230 		{7, 7}
1231 		}
1232 	},
1233 	{0, 1, 3, 0,		/* 0xa6 */
1234 		{{1, 2},
1235 		{5, 5},
1236 		{7, 7},
1237 		{0, 0}
1238 		}
1239 	},
1240 	{1, 1, 3, 0,		/* 0xa7 */
1241 		{{0, 2},
1242 		{5, 5},
1243 		{7, 7},
1244 		{0, 0}
1245 		}
1246 	},
1247 	{0, 1, 3, 0,		/* 0xa8 */
1248 		{{3, 3},
1249 		{5, 5},
1250 		{7, 7},
1251 		{0, 0}
1252 		}
1253 	},
1254 	{1, 1, 4, 0,		/* 0xa9 */
1255 		{{0, 0},
1256 		{3, 3},
1257 		{5, 5},
1258 		{7, 7}
1259 		}
1260 	},
1261 	{0, 1, 4, 0,		/* 0xaa */
1262 		{{1, 1},
1263 		{3, 3},
1264 		{5, 5},
1265 		{7, 7}
1266 		}
1267 	},
1268 	{1, 1, 4, 0,		/* 0xab */
1269 		{{0, 1},
1270 		{3, 3},
1271 		{5, 5},
1272 		{7, 7}
1273 		}
1274 	},
1275 	{0, 1, 3, 0,		/* 0xac */
1276 		{{2, 3},
1277 		{5, 5},
1278 		{7, 7},
1279 		{0, 0}
1280 		}
1281 	},
1282 	{1, 1, 4, 0,		/* 0xad */
1283 		{{0, 0},
1284 		{2, 3},
1285 		{5, 5},
1286 		{7, 7}
1287 		}
1288 	},
1289 	{0, 1, 3, 0,		/* 0xae */
1290 		{{1, 3},
1291 		{5, 5},
1292 		{7, 7},
1293 		{0, 0}
1294 		}
1295 	},
1296 	{1, 1, 3, 0,		/* 0xaf */
1297 		{{0, 3},
1298 		{5, 5},
1299 		{7, 7},
1300 		{0, 0}
1301 		}
1302 	},
1303 	{0, 1, 2, 0,		/* 0xb0 */
1304 		{{4, 5},
1305 		{7, 7},
1306 		{0, 0},
1307 		{0, 0}
1308 		}
1309 	},
1310 	{1, 1, 3, 0,		/* 0xb1 */
1311 		{{0, 0},
1312 		{4, 5},
1313 		{7, 7},
1314 		{0, 0}
1315 		}
1316 	},
1317 	{0, 1, 3, 0,		/* 0xb2 */
1318 		{{1, 1},
1319 		{4, 5},
1320 		{7, 7},
1321 		{0, 0}
1322 		}
1323 	},
1324 	{1, 1, 3, 0,		/* 0xb3 */
1325 		{{0, 1},
1326 		{4, 5},
1327 		{7, 7},
1328 		{0, 0}
1329 		}
1330 	},
1331 	{0, 1, 3, 0,		/* 0xb4 */
1332 		{{2, 2},
1333 		{4, 5},
1334 		{7, 7},
1335 		{0, 0}
1336 		}
1337 	},
1338 	{1, 1, 4, 0,		/* 0xb5 */
1339 		{{0, 0},
1340 		{2, 2},
1341 		{4, 5},
1342 		{7, 7}
1343 		}
1344 	},
1345 	{0, 1, 3, 0,		/* 0xb6 */
1346 		{{1, 2},
1347 		{4, 5},
1348 		{7, 7},
1349 		{0, 0}
1350 		}
1351 	},
1352 	{1, 1, 3, 0,		/* 0xb7 */
1353 		{{0, 2},
1354 		{4, 5},
1355 		{7, 7},
1356 		{0, 0}
1357 		}
1358 	},
1359 	{0, 1, 2, 0,		/* 0xb8 */
1360 		{{3, 5},
1361 		{7, 7},
1362 		{0, 0},
1363 		{0, 0}
1364 		}
1365 	},
1366 	{1, 1, 3, 0,		/* 0xb9 */
1367 		{{0, 0},
1368 		{3, 5},
1369 		{7, 7},
1370 		{0, 0}
1371 		}
1372 	},
1373 	{0, 1, 3, 0,		/* 0xba */
1374 		{{1, 1},
1375 		{3, 5},
1376 		{7, 7},
1377 		{0, 0}
1378 		}
1379 	},
1380 	{1, 1, 3, 0,		/* 0xbb */
1381 		{{0, 1},
1382 		{3, 5},
1383 		{7, 7},
1384 		{0, 0}
1385 		}
1386 	},
1387 	{0, 1, 2, 0,		/* 0xbc */
1388 		{{2, 5},
1389 		{7, 7},
1390 		{0, 0},
1391 		{0, 0}
1392 		}
1393 	},
1394 	{1, 1, 3, 0,		/* 0xbd */
1395 		{{0, 0},
1396 		{2, 5},
1397 		{7, 7},
1398 		{0, 0}
1399 		}
1400 	},
1401 	{0, 1, 2, 0,		/* 0xbe */
1402 		{{1, 5},
1403 		{7, 7},
1404 		{0, 0},
1405 		{0, 0}
1406 		}
1407 	},
1408 	{1, 1, 2, 0,		/* 0xbf */
1409 		{{0, 5},
1410 		{7, 7},
1411 		{0, 0},
1412 		{0, 0}
1413 		}
1414 	},
1415 	{0, 1, 1, 0,		/* 0xc0 */
1416 		{{6, 7},
1417 		{0, 0},
1418 		{0, 0},
1419 		{0, 0}
1420 		}
1421 	},
1422 	{1, 1, 2, 0,		/* 0xc1 */
1423 		{{0, 0},
1424 		{6, 7},
1425 		{0, 0},
1426 		{0, 0}
1427 		}
1428 	},
1429 	{0, 1, 2, 0,		/* 0xc2 */
1430 		{{1, 1},
1431 		{6, 7},
1432 		{0, 0},
1433 		{0, 0}
1434 		}
1435 	},
1436 	{1, 1, 2, 0,		/* 0xc3 */
1437 		{{0, 1},
1438 		{6, 7},
1439 		{0, 0},
1440 		{0, 0}
1441 		}
1442 	},
1443 	{0, 1, 2, 0,		/* 0xc4 */
1444 		{{2, 2},
1445 		{6, 7},
1446 		{0, 0},
1447 		{0, 0}
1448 		}
1449 	},
1450 	{1, 1, 3, 0,		/* 0xc5 */
1451 		{{0, 0},
1452 		{2, 2},
1453 		{6, 7},
1454 		{0, 0}
1455 		}
1456 	},
1457 	{0, 1, 2, 0,		/* 0xc6 */
1458 		{{1, 2},
1459 		{6, 7},
1460 		{0, 0},
1461 		{0, 0}
1462 		}
1463 	},
1464 	{1, 1, 2, 0,		/* 0xc7 */
1465 		{{0, 2},
1466 		{6, 7},
1467 		{0, 0},
1468 		{0, 0}
1469 		}
1470 	},
1471 	{0, 1, 2, 0,		/* 0xc8 */
1472 		{{3, 3},
1473 		{6, 7},
1474 		{0, 0},
1475 		{0, 0}
1476 		}
1477 	},
1478 	{1, 1, 3, 0,		/* 0xc9 */
1479 		{{0, 0},
1480 		{3, 3},
1481 		{6, 7},
1482 		{0, 0}
1483 		}
1484 	},
1485 	{0, 1, 3, 0,		/* 0xca */
1486 		{{1, 1},
1487 		{3, 3},
1488 		{6, 7},
1489 		{0, 0}
1490 		}
1491 	},
1492 	{1, 1, 3, 0,		/* 0xcb */
1493 		{{0, 1},
1494 		{3, 3},
1495 		{6, 7},
1496 		{0, 0}
1497 		}
1498 	},
1499 	{0, 1, 2, 0,		/* 0xcc */
1500 		{{2, 3},
1501 		{6, 7},
1502 		{0, 0},
1503 		{0, 0}
1504 		}
1505 	},
1506 	{1, 1, 3, 0,		/* 0xcd */
1507 		{{0, 0},
1508 		{2, 3},
1509 		{6, 7},
1510 		{0, 0}
1511 		}
1512 	},
1513 	{0, 1, 2, 0,		/* 0xce */
1514 		{{1, 3},
1515 		{6, 7},
1516 		{0, 0},
1517 		{0, 0}
1518 		}
1519 	},
1520 	{1, 1, 2, 0,		/* 0xcf */
1521 		{{0, 3},
1522 		{6, 7},
1523 		{0, 0},
1524 		{0, 0}
1525 		}
1526 	},
1527 	{0, 1, 2, 0,		/* 0xd0 */
1528 		{{4, 4},
1529 		{6, 7},
1530 		{0, 0},
1531 		{0, 0}
1532 		}
1533 	},
1534 	{1, 1, 3, 0,		/* 0xd1 */
1535 		{{0, 0},
1536 		{4, 4},
1537 		{6, 7},
1538 		{0, 0}
1539 		}
1540 	},
1541 	{0, 1, 3, 0,		/* 0xd2 */
1542 		{{1, 1},
1543 		{4, 4},
1544 		{6, 7},
1545 		{0, 0}
1546 		}
1547 	},
1548 	{1, 1, 3, 0,		/* 0xd3 */
1549 		{{0, 1},
1550 		{4, 4},
1551 		{6, 7},
1552 		{0, 0}
1553 		}
1554 	},
1555 	{0, 1, 3, 0,		/* 0xd4 */
1556 		{{2, 2},
1557 		{4, 4},
1558 		{6, 7},
1559 		{0, 0}
1560 		}
1561 	},
1562 	{1, 1, 4, 0,		/* 0xd5 */
1563 		{{0, 0},
1564 		{2, 2},
1565 		{4, 4},
1566 		{6, 7}
1567 		}
1568 	},
1569 	{0, 1, 3, 0,		/* 0xd6 */
1570 		{{1, 2},
1571 		{4, 4},
1572 		{6, 7},
1573 		{0, 0}
1574 		}
1575 	},
1576 	{1, 1, 3, 0,		/* 0xd7 */
1577 		{{0, 2},
1578 		{4, 4},
1579 		{6, 7},
1580 		{0, 0}
1581 		}
1582 	},
1583 	{0, 1, 2, 0,		/* 0xd8 */
1584 		{{3, 4},
1585 		{6, 7},
1586 		{0, 0},
1587 		{0, 0}
1588 		}
1589 	},
1590 	{1, 1, 3, 0,		/* 0xd9 */
1591 		{{0, 0},
1592 		{3, 4},
1593 		{6, 7},
1594 		{0, 0}
1595 		}
1596 	},
1597 	{0, 1, 3, 0,		/* 0xda */
1598 		{{1, 1},
1599 		{3, 4},
1600 		{6, 7},
1601 		{0, 0}
1602 		}
1603 	},
1604 	{1, 1, 3, 0,		/* 0xdb */
1605 		{{0, 1},
1606 		{3, 4},
1607 		{6, 7},
1608 		{0, 0}
1609 		}
1610 	},
1611 	{0, 1, 2, 0,		/* 0xdc */
1612 		{{2, 4},
1613 		{6, 7},
1614 		{0, 0},
1615 		{0, 0}
1616 		}
1617 	},
1618 	{1, 1, 3, 0,		/* 0xdd */
1619 		{{0, 0},
1620 		{2, 4},
1621 		{6, 7},
1622 		{0, 0}
1623 		}
1624 	},
1625 	{0, 1, 2, 0,		/* 0xde */
1626 		{{1, 4},
1627 		{6, 7},
1628 		{0, 0},
1629 		{0, 0}
1630 		}
1631 	},
1632 	{1, 1, 2, 0,		/* 0xdf */
1633 		{{0, 4},
1634 		{6, 7},
1635 		{0, 0},
1636 		{0, 0}
1637 		}
1638 	},
1639 	{0, 1, 1, 0,		/* 0xe0 */
1640 		{{5, 7},
1641 		{0, 0},
1642 		{0, 0},
1643 		{0, 0}
1644 		}
1645 	},
1646 	{1, 1, 2, 0,		/* 0xe1 */
1647 		{{0, 0},
1648 		{5, 7},
1649 		{0, 0},
1650 		{0, 0}
1651 		}
1652 	},
1653 	{0, 1, 2, 0,		/* 0xe2 */
1654 		{{1, 1},
1655 		{5, 7},
1656 		{0, 0},
1657 		{0, 0}
1658 		}
1659 	},
1660 	{1, 1, 2, 0,		/* 0xe3 */
1661 		{{0, 1},
1662 		{5, 7},
1663 		{0, 0},
1664 		{0, 0}
1665 		}
1666 	},
1667 	{0, 1, 2, 0,		/* 0xe4 */
1668 		{{2, 2},
1669 		{5, 7},
1670 		{0, 0},
1671 		{0, 0}
1672 		}
1673 	},
1674 	{1, 1, 3, 0,		/* 0xe5 */
1675 		{{0, 0},
1676 		{2, 2},
1677 		{5, 7},
1678 		{0, 0}
1679 		}
1680 	},
1681 	{0, 1, 2, 0,		/* 0xe6 */
1682 		{{1, 2},
1683 		{5, 7},
1684 		{0, 0},
1685 		{0, 0}
1686 		}
1687 	},
1688 	{1, 1, 2, 0,		/* 0xe7 */
1689 		{{0, 2},
1690 		{5, 7},
1691 		{0, 0},
1692 		{0, 0}
1693 		}
1694 	},
1695 	{0, 1, 2, 0,		/* 0xe8 */
1696 		{{3, 3},
1697 		{5, 7},
1698 		{0, 0},
1699 		{0, 0}
1700 		}
1701 	},
1702 	{1, 1, 3, 0,		/* 0xe9 */
1703 		{{0, 0},
1704 		{3, 3},
1705 		{5, 7},
1706 		{0, 0}
1707 		}
1708 	},
1709 	{0, 1, 3, 0,		/* 0xea */
1710 		{{1, 1},
1711 		{3, 3},
1712 		{5, 7},
1713 		{0, 0}
1714 		}
1715 	},
1716 	{1, 1, 3, 0,		/* 0xeb */
1717 		{{0, 1},
1718 		{3, 3},
1719 		{5, 7},
1720 		{0, 0}
1721 		}
1722 	},
1723 	{0, 1, 2, 0,		/* 0xec */
1724 		{{2, 3},
1725 		{5, 7},
1726 		{0, 0},
1727 		{0, 0}
1728 		}
1729 	},
1730 	{1, 1, 3, 0,		/* 0xed */
1731 		{{0, 0},
1732 		{2, 3},
1733 		{5, 7},
1734 		{0, 0}
1735 		}
1736 	},
1737 	{0, 1, 2, 0,		/* 0xee */
1738 		{{1, 3},
1739 		{5, 7},
1740 		{0, 0},
1741 		{0, 0}
1742 		}
1743 	},
1744 	{1, 1, 2, 0,		/* 0xef */
1745 		{{0, 3},
1746 		{5, 7},
1747 		{0, 0},
1748 		{0, 0}
1749 		}
1750 	},
1751 	{0, 1, 1, 0,		/* 0xf0 */
1752 		{{4, 7},
1753 		{0, 0},
1754 		{0, 0},
1755 		{0, 0}
1756 		}
1757 	},
1758 	{1, 1, 2, 0,		/* 0xf1 */
1759 		{{0, 0},
1760 		{4, 7},
1761 		{0, 0},
1762 		{0, 0}
1763 		}
1764 	},
1765 	{0, 1, 2, 0,		/* 0xf2 */
1766 		{{1, 1},
1767 		{4, 7},
1768 		{0, 0},
1769 		{0, 0}
1770 		}
1771 	},
1772 	{1, 1, 2, 0,		/* 0xf3 */
1773 		{{0, 1},
1774 		{4, 7},
1775 		{0, 0},
1776 		{0, 0}
1777 		}
1778 	},
1779 	{0, 1, 2, 0,		/* 0xf4 */
1780 		{{2, 2},
1781 		{4, 7},
1782 		{0, 0},
1783 		{0, 0}
1784 		}
1785 	},
1786 	{1, 1, 3, 0,		/* 0xf5 */
1787 		{{0, 0},
1788 		{2, 2},
1789 		{4, 7},
1790 		{0, 0}
1791 		}
1792 	},
1793 	{0, 1, 2, 0,		/* 0xf6 */
1794 		{{1, 2},
1795 		{4, 7},
1796 		{0, 0},
1797 		{0, 0}
1798 		}
1799 	},
1800 	{1, 1, 2, 0,		/* 0xf7 */
1801 		{{0, 2},
1802 		{4, 7},
1803 		{0, 0},
1804 		{0, 0}
1805 		}
1806 	},
1807 	{0, 1, 1, 0,		/* 0xf8 */
1808 		{{3, 7},
1809 		{0, 0},
1810 		{0, 0},
1811 		{0, 0}
1812 		}
1813 	},
1814 	{1, 1, 2, 0,		/* 0xf9 */
1815 		{{0, 0},
1816 		{3, 7},
1817 		{0, 0},
1818 		{0, 0}
1819 		}
1820 	},
1821 	{0, 1, 2, 0,		/* 0xfa */
1822 		{{1, 1},
1823 		{3, 7},
1824 		{0, 0},
1825 		{0, 0}
1826 		}
1827 	},
1828 	{1, 1, 2, 0,		/* 0xfb */
1829 		{{0, 1},
1830 		{3, 7},
1831 		{0, 0},
1832 		{0, 0}
1833 		}
1834 	},
1835 	{0, 1, 1, 0,		/* 0xfc */
1836 		{{2, 7},
1837 		{0, 0},
1838 		{0, 0},
1839 		{0, 0}
1840 		}
1841 	},
1842 	{1, 1, 2, 0,		/* 0xfd */
1843 		{{0, 0},
1844 		{2, 7},
1845 		{0, 0},
1846 		{0, 0}
1847 		}
1848 	},
1849 	{0, 1, 1, 0,		/* 0xfe */
1850 		{{1, 7},
1851 		{0, 0},
1852 		{0, 0},
1853 		{0, 0}
1854 		}
1855 	},
1856 	{1, 1, 1, 0,		/* 0xff */
1857 		{{0, 7},
1858 		{0, 0},
1859 		{0, 0},
1860 		{0, 0}
1861 		}
1862 	}
1863 };
1864 
1865 
1866 int
1867 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1868     struct sctp_scoping *scope,
1869     int do_update)
1870 {
1871 	if ((scope->loopback_scope == 0) &&
1872 	    (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1873 		/*
1874 		 * skip loopback if not in scope *
1875 		 */
1876 		return (0);
1877 	}
1878 	switch (ifa->address.sa.sa_family) {
1879 #ifdef INET
1880 	case AF_INET:
1881 		if (scope->ipv4_addr_legal) {
1882 			struct sockaddr_in *sin;
1883 
1884 			sin = &ifa->address.sin;
1885 			if (sin->sin_addr.s_addr == 0) {
1886 				/* not in scope , unspecified */
1887 				return (0);
1888 			}
1889 			if ((scope->ipv4_local_scope == 0) &&
1890 			    (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1891 				/* private address not in scope */
1892 				return (0);
1893 			}
1894 		} else {
1895 			return (0);
1896 		}
1897 		break;
1898 #endif
1899 #ifdef INET6
1900 	case AF_INET6:
1901 		if (scope->ipv6_addr_legal) {
1902 			struct sockaddr_in6 *sin6;
1903 
1904 			/*
1905 			 * Must update the flags,  bummer, which means any
1906 			 * IFA locks must now be applied HERE <->
1907 			 */
1908 			if (do_update) {
1909 				sctp_gather_internal_ifa_flags(ifa);
1910 			}
1911 			if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1912 				return (0);
1913 			}
1914 			/* ok to use deprecated addresses? */
1915 			sin6 = &ifa->address.sin6;
1916 			if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1917 				/* skip unspecifed addresses */
1918 				return (0);
1919 			}
1920 			if (	/* (local_scope == 0) && */
1921 			    (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1922 				return (0);
1923 			}
1924 			if ((scope->site_scope == 0) &&
1925 			    (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1926 				return (0);
1927 			}
1928 		} else {
1929 			return (0);
1930 		}
1931 		break;
1932 #endif
1933 	default:
1934 		return (0);
1935 	}
1936 	return (1);
1937 }
1938 
1939 static struct mbuf *
1940 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
1941 {
1942 #if defined(INET) || defined(INET6)
1943 	struct sctp_paramhdr *parmh;
1944 	struct mbuf *mret;
1945 	uint16_t plen;
1946 #endif
1947 
1948 	switch (ifa->address.sa.sa_family) {
1949 #ifdef INET
1950 	case AF_INET:
1951 		plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
1952 		break;
1953 #endif
1954 #ifdef INET6
1955 	case AF_INET6:
1956 		plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
1957 		break;
1958 #endif
1959 	default:
1960 		return (m);
1961 	}
1962 #if defined(INET) || defined(INET6)
1963 	if (M_TRAILINGSPACE(m) >= plen) {
1964 		/* easy side we just drop it on the end */
1965 		parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1966 		mret = m;
1967 	} else {
1968 		/* Need more space */
1969 		mret = m;
1970 		while (SCTP_BUF_NEXT(mret) != NULL) {
1971 			mret = SCTP_BUF_NEXT(mret);
1972 		}
1973 		SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1974 		if (SCTP_BUF_NEXT(mret) == NULL) {
1975 			/* We are hosed, can't add more addresses */
1976 			return (m);
1977 		}
1978 		mret = SCTP_BUF_NEXT(mret);
1979 		parmh = mtod(mret, struct sctp_paramhdr *);
1980 	}
1981 	/* now add the parameter */
1982 	switch (ifa->address.sa.sa_family) {
1983 #ifdef INET
1984 	case AF_INET:
1985 		{
1986 			struct sctp_ipv4addr_param *ipv4p;
1987 			struct sockaddr_in *sin;
1988 
1989 			sin = &ifa->address.sin;
1990 			ipv4p = (struct sctp_ipv4addr_param *)parmh;
1991 			parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1992 			parmh->param_length = htons(plen);
1993 			ipv4p->addr = sin->sin_addr.s_addr;
1994 			SCTP_BUF_LEN(mret) += plen;
1995 			break;
1996 		}
1997 #endif
1998 #ifdef INET6
1999 	case AF_INET6:
2000 		{
2001 			struct sctp_ipv6addr_param *ipv6p;
2002 			struct sockaddr_in6 *sin6;
2003 
2004 			sin6 = &ifa->address.sin6;
2005 			ipv6p = (struct sctp_ipv6addr_param *)parmh;
2006 			parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2007 			parmh->param_length = htons(plen);
2008 			memcpy(ipv6p->addr, &sin6->sin6_addr,
2009 			    sizeof(ipv6p->addr));
2010 			/* clear embedded scope in the address */
2011 			in6_clearscope((struct in6_addr *)ipv6p->addr);
2012 			SCTP_BUF_LEN(mret) += plen;
2013 			break;
2014 		}
2015 #endif
2016 	default:
2017 		return (m);
2018 	}
2019 	if (len != NULL) {
2020 		*len += plen;
2021 	}
2022 	return (mret);
2023 #endif
2024 }
2025 
2026 
2027 struct mbuf *
2028 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2029     struct sctp_scoping *scope,
2030     struct mbuf *m_at, int cnt_inits_to,
2031     uint16_t *padding_len, uint16_t *chunk_len)
2032 {
2033 	struct sctp_vrf *vrf = NULL;
2034 	int cnt, limit_out = 0, total_count;
2035 	uint32_t vrf_id;
2036 
2037 	vrf_id = inp->def_vrf_id;
2038 	SCTP_IPI_ADDR_RLOCK();
2039 	vrf = sctp_find_vrf(vrf_id);
2040 	if (vrf == NULL) {
2041 		SCTP_IPI_ADDR_RUNLOCK();
2042 		return (m_at);
2043 	}
2044 	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2045 		struct sctp_ifa *sctp_ifap;
2046 		struct sctp_ifn *sctp_ifnp;
2047 
2048 		cnt = cnt_inits_to;
2049 		if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2050 			limit_out = 1;
2051 			cnt = SCTP_ADDRESS_LIMIT;
2052 			goto skip_count;
2053 		}
2054 		LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2055 			if ((scope->loopback_scope == 0) &&
2056 			    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2057 				/*
2058 				 * Skip loopback devices if loopback_scope
2059 				 * not set
2060 				 */
2061 				continue;
2062 			}
2063 			LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2064 #ifdef INET
2065 				if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2066 				    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2067 				    &sctp_ifap->address.sin.sin_addr) != 0)) {
2068 					continue;
2069 				}
2070 #endif
2071 #ifdef INET6
2072 				if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2073 				    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2074 				    &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2075 					continue;
2076 				}
2077 #endif
2078 				if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2079 					continue;
2080 				}
2081 				if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2082 					continue;
2083 				}
2084 				cnt++;
2085 				if (cnt > SCTP_ADDRESS_LIMIT) {
2086 					break;
2087 				}
2088 			}
2089 			if (cnt > SCTP_ADDRESS_LIMIT) {
2090 				break;
2091 			}
2092 		}
2093 skip_count:
2094 		if (cnt > 1) {
2095 			total_count = 0;
2096 			LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2097 				cnt = 0;
2098 				if ((scope->loopback_scope == 0) &&
2099 				    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2100 					/*
2101 					 * Skip loopback devices if
2102 					 * loopback_scope not set
2103 					 */
2104 					continue;
2105 				}
2106 				LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2107 #ifdef INET
2108 					if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2109 					    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2110 					    &sctp_ifap->address.sin.sin_addr) != 0)) {
2111 						continue;
2112 					}
2113 #endif
2114 #ifdef INET6
2115 					if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2116 					    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2117 					    &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2118 						continue;
2119 					}
2120 #endif
2121 					if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2122 						continue;
2123 					}
2124 					if (sctp_is_address_in_scope(sctp_ifap,
2125 					    scope, 0) == 0) {
2126 						continue;
2127 					}
2128 					if ((chunk_len != NULL) &&
2129 					    (padding_len != NULL) &&
2130 					    (*padding_len > 0)) {
2131 						memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2132 						SCTP_BUF_LEN(m_at) += *padding_len;
2133 						*chunk_len += *padding_len;
2134 						*padding_len = 0;
2135 					}
2136 					m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2137 					if (limit_out) {
2138 						cnt++;
2139 						total_count++;
2140 						if (cnt >= 2) {
2141 							/*
2142 							 * two from each
2143 							 * address
2144 							 */
2145 							break;
2146 						}
2147 						if (total_count > SCTP_ADDRESS_LIMIT) {
2148 							/* No more addresses */
2149 							break;
2150 						}
2151 					}
2152 				}
2153 			}
2154 		}
2155 	} else {
2156 		struct sctp_laddr *laddr;
2157 
2158 		cnt = cnt_inits_to;
2159 		/* First, how many ? */
2160 		LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2161 			if (laddr->ifa == NULL) {
2162 				continue;
2163 			}
2164 			if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2165 				/*
2166 				 * Address being deleted by the system, dont
2167 				 * list.
2168 				 */
2169 				continue;
2170 			if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2171 				/*
2172 				 * Address being deleted on this ep don't
2173 				 * list.
2174 				 */
2175 				continue;
2176 			}
2177 			if (sctp_is_address_in_scope(laddr->ifa,
2178 			    scope, 1) == 0) {
2179 				continue;
2180 			}
2181 			cnt++;
2182 		}
2183 		/*
2184 		 * To get through a NAT we only list addresses if we have
2185 		 * more than one. That way if you just bind a single address
2186 		 * we let the source of the init dictate our address.
2187 		 */
2188 		if (cnt > 1) {
2189 			cnt = cnt_inits_to;
2190 			LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2191 				if (laddr->ifa == NULL) {
2192 					continue;
2193 				}
2194 				if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2195 					continue;
2196 				}
2197 				if (sctp_is_address_in_scope(laddr->ifa,
2198 				    scope, 0) == 0) {
2199 					continue;
2200 				}
2201 				if ((chunk_len != NULL) &&
2202 				    (padding_len != NULL) &&
2203 				    (*padding_len > 0)) {
2204 					memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2205 					SCTP_BUF_LEN(m_at) += *padding_len;
2206 					*chunk_len += *padding_len;
2207 					*padding_len = 0;
2208 				}
2209 				m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2210 				cnt++;
2211 				if (cnt >= SCTP_ADDRESS_LIMIT) {
2212 					break;
2213 				}
2214 			}
2215 		}
2216 	}
2217 	SCTP_IPI_ADDR_RUNLOCK();
2218 	return (m_at);
2219 }
2220 
2221 static struct sctp_ifa *
2222 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2223     uint8_t dest_is_loop,
2224     uint8_t dest_is_priv,
2225     sa_family_t fam)
2226 {
2227 	uint8_t dest_is_global = 0;
2228 
2229 	/* dest_is_priv is true if destination is a private address */
2230 	/* dest_is_loop is true if destination is a loopback addresses */
2231 
2232 	/**
2233 	 * Here we determine if its a preferred address. A preferred address
2234 	 * means it is the same scope or higher scope then the destination.
2235 	 * L = loopback, P = private, G = global
2236 	 * -----------------------------------------
2237 	 *    src    |  dest | result
2238 	 *  ----------------------------------------
2239 	 *     L     |    L  |    yes
2240 	 *  -----------------------------------------
2241 	 *     P     |    L  |    yes-v4 no-v6
2242 	 *  -----------------------------------------
2243 	 *     G     |    L  |    yes-v4 no-v6
2244 	 *  -----------------------------------------
2245 	 *     L     |    P  |    no
2246 	 *  -----------------------------------------
2247 	 *     P     |    P  |    yes
2248 	 *  -----------------------------------------
2249 	 *     G     |    P  |    no
2250 	 *   -----------------------------------------
2251 	 *     L     |    G  |    no
2252 	 *   -----------------------------------------
2253 	 *     P     |    G  |    no
2254 	 *    -----------------------------------------
2255 	 *     G     |    G  |    yes
2256 	 *    -----------------------------------------
2257 	 */
2258 
2259 	if (ifa->address.sa.sa_family != fam) {
2260 		/* forget mis-matched family */
2261 		return (NULL);
2262 	}
2263 	if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2264 		dest_is_global = 1;
2265 	}
2266 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2267 	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2268 	/* Ok the address may be ok */
2269 #ifdef INET6
2270 	if (fam == AF_INET6) {
2271 		/* ok to use deprecated addresses? no lets not! */
2272 		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2273 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2274 			return (NULL);
2275 		}
2276 		if (ifa->src_is_priv && !ifa->src_is_loop) {
2277 			if (dest_is_loop) {
2278 				SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2279 				return (NULL);
2280 			}
2281 		}
2282 		if (ifa->src_is_glob) {
2283 			if (dest_is_loop) {
2284 				SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2285 				return (NULL);
2286 			}
2287 		}
2288 	}
2289 #endif
2290 	/*
2291 	 * Now that we know what is what, implement or table this could in
2292 	 * theory be done slicker (it used to be), but this is
2293 	 * straightforward and easier to validate :-)
2294 	 */
2295 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2296 	    ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2297 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2298 	    dest_is_loop, dest_is_priv, dest_is_global);
2299 
2300 	if ((ifa->src_is_loop) && (dest_is_priv)) {
2301 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2302 		return (NULL);
2303 	}
2304 	if ((ifa->src_is_glob) && (dest_is_priv)) {
2305 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2306 		return (NULL);
2307 	}
2308 	if ((ifa->src_is_loop) && (dest_is_global)) {
2309 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2310 		return (NULL);
2311 	}
2312 	if ((ifa->src_is_priv) && (dest_is_global)) {
2313 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2314 		return (NULL);
2315 	}
2316 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2317 	/* its a preferred address */
2318 	return (ifa);
2319 }
2320 
2321 static struct sctp_ifa *
2322 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2323     uint8_t dest_is_loop,
2324     uint8_t dest_is_priv,
2325     sa_family_t fam)
2326 {
2327 	uint8_t dest_is_global = 0;
2328 
2329 	/**
2330 	 * Here we determine if its a acceptable address. A acceptable
2331 	 * address means it is the same scope or higher scope but we can
2332 	 * allow for NAT which means its ok to have a global dest and a
2333 	 * private src.
2334 	 *
2335 	 * L = loopback, P = private, G = global
2336 	 * -----------------------------------------
2337 	 *  src    |  dest | result
2338 	 * -----------------------------------------
2339 	 *   L     |   L   |    yes
2340 	 *  -----------------------------------------
2341 	 *   P     |   L   |    yes-v4 no-v6
2342 	 *  -----------------------------------------
2343 	 *   G     |   L   |    yes
2344 	 * -----------------------------------------
2345 	 *   L     |   P   |    no
2346 	 * -----------------------------------------
2347 	 *   P     |   P   |    yes
2348 	 * -----------------------------------------
2349 	 *   G     |   P   |    yes - May not work
2350 	 * -----------------------------------------
2351 	 *   L     |   G   |    no
2352 	 * -----------------------------------------
2353 	 *   P     |   G   |    yes - May not work
2354 	 * -----------------------------------------
2355 	 *   G     |   G   |    yes
2356 	 * -----------------------------------------
2357 	 */
2358 
2359 	if (ifa->address.sa.sa_family != fam) {
2360 		/* forget non matching family */
2361 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2362 		    ifa->address.sa.sa_family, fam);
2363 		return (NULL);
2364 	}
2365 	/* Ok the address may be ok */
2366 	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2367 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2368 	    dest_is_loop, dest_is_priv);
2369 	if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2370 		dest_is_global = 1;
2371 	}
2372 #ifdef INET6
2373 	if (fam == AF_INET6) {
2374 		/* ok to use deprecated addresses? */
2375 		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2376 			return (NULL);
2377 		}
2378 		if (ifa->src_is_priv) {
2379 			/* Special case, linklocal to loop */
2380 			if (dest_is_loop)
2381 				return (NULL);
2382 		}
2383 	}
2384 #endif
2385 	/*
2386 	 * Now that we know what is what, implement our table. This could in
2387 	 * theory be done slicker (it used to be), but this is
2388 	 * straightforward and easier to validate :-)
2389 	 */
2390 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2391 	    ifa->src_is_loop,
2392 	    dest_is_priv);
2393 	if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2394 		return (NULL);
2395 	}
2396 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2397 	    ifa->src_is_loop,
2398 	    dest_is_global);
2399 	if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2400 		return (NULL);
2401 	}
2402 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2403 	/* its an acceptable address */
2404 	return (ifa);
2405 }
2406 
2407 int
2408 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2409 {
2410 	struct sctp_laddr *laddr;
2411 
2412 	if (stcb == NULL) {
2413 		/* There are no restrictions, no TCB :-) */
2414 		return (0);
2415 	}
2416 	LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2417 		if (laddr->ifa == NULL) {
2418 			SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2419 			    __func__);
2420 			continue;
2421 		}
2422 		if (laddr->ifa == ifa) {
2423 			/* Yes it is on the list */
2424 			return (1);
2425 		}
2426 	}
2427 	return (0);
2428 }
2429 
2430 
2431 int
2432 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2433 {
2434 	struct sctp_laddr *laddr;
2435 
2436 	if (ifa == NULL)
2437 		return (0);
2438 	LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2439 		if (laddr->ifa == NULL) {
2440 			SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2441 			    __func__);
2442 			continue;
2443 		}
2444 		if ((laddr->ifa == ifa) && laddr->action == 0)
2445 			/* same pointer */
2446 			return (1);
2447 	}
2448 	return (0);
2449 }
2450 
2451 
2452 
2453 static struct sctp_ifa *
2454 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2455     sctp_route_t *ro,
2456     uint32_t vrf_id,
2457     int non_asoc_addr_ok,
2458     uint8_t dest_is_priv,
2459     uint8_t dest_is_loop,
2460     sa_family_t fam)
2461 {
2462 	struct sctp_laddr *laddr, *starting_point;
2463 	void *ifn;
2464 	int resettotop = 0;
2465 	struct sctp_ifn *sctp_ifn;
2466 	struct sctp_ifa *sctp_ifa, *sifa;
2467 	struct sctp_vrf *vrf;
2468 	uint32_t ifn_index;
2469 
2470 	vrf = sctp_find_vrf(vrf_id);
2471 	if (vrf == NULL)
2472 		return (NULL);
2473 
2474 	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2475 	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2476 	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2477 	/*
2478 	 * first question, is the ifn we will emit on in our list, if so, we
2479 	 * want such an address. Note that we first looked for a preferred
2480 	 * address.
2481 	 */
2482 	if (sctp_ifn) {
2483 		/* is a preferred one on the interface we route out? */
2484 		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2485 #ifdef INET
2486 			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2487 			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2488 			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2489 				continue;
2490 			}
2491 #endif
2492 #ifdef INET6
2493 			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2494 			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2495 			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2496 				continue;
2497 			}
2498 #endif
2499 			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2500 			    (non_asoc_addr_ok == 0))
2501 				continue;
2502 			sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2503 			    dest_is_loop,
2504 			    dest_is_priv, fam);
2505 			if (sifa == NULL)
2506 				continue;
2507 			if (sctp_is_addr_in_ep(inp, sifa)) {
2508 				atomic_add_int(&sifa->refcount, 1);
2509 				return (sifa);
2510 			}
2511 		}
2512 	}
2513 	/*
2514 	 * ok, now we now need to find one on the list of the addresses. We
2515 	 * can't get one on the emitting interface so let's find first a
2516 	 * preferred one. If not that an acceptable one otherwise... we
2517 	 * return NULL.
2518 	 */
2519 	starting_point = inp->next_addr_touse;
2520 once_again:
2521 	if (inp->next_addr_touse == NULL) {
2522 		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2523 		resettotop = 1;
2524 	}
2525 	for (laddr = inp->next_addr_touse; laddr;
2526 	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2527 		if (laddr->ifa == NULL) {
2528 			/* address has been removed */
2529 			continue;
2530 		}
2531 		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2532 			/* address is being deleted */
2533 			continue;
2534 		}
2535 		sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2536 		    dest_is_priv, fam);
2537 		if (sifa == NULL)
2538 			continue;
2539 		atomic_add_int(&sifa->refcount, 1);
2540 		return (sifa);
2541 	}
2542 	if (resettotop == 0) {
2543 		inp->next_addr_touse = NULL;
2544 		goto once_again;
2545 	}
2546 	inp->next_addr_touse = starting_point;
2547 	resettotop = 0;
2548 once_again_too:
2549 	if (inp->next_addr_touse == NULL) {
2550 		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2551 		resettotop = 1;
2552 	}
2553 	/* ok, what about an acceptable address in the inp */
2554 	for (laddr = inp->next_addr_touse; laddr;
2555 	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2556 		if (laddr->ifa == NULL) {
2557 			/* address has been removed */
2558 			continue;
2559 		}
2560 		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2561 			/* address is being deleted */
2562 			continue;
2563 		}
2564 		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2565 		    dest_is_priv, fam);
2566 		if (sifa == NULL)
2567 			continue;
2568 		atomic_add_int(&sifa->refcount, 1);
2569 		return (sifa);
2570 	}
2571 	if (resettotop == 0) {
2572 		inp->next_addr_touse = NULL;
2573 		goto once_again_too;
2574 	}
2575 	/*
2576 	 * no address bound can be a source for the destination we are in
2577 	 * trouble
2578 	 */
2579 	return (NULL);
2580 }
2581 
2582 
2583 
2584 static struct sctp_ifa *
2585 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2586     struct sctp_tcb *stcb,
2587     sctp_route_t *ro,
2588     uint32_t vrf_id,
2589     uint8_t dest_is_priv,
2590     uint8_t dest_is_loop,
2591     int non_asoc_addr_ok,
2592     sa_family_t fam)
2593 {
2594 	struct sctp_laddr *laddr, *starting_point;
2595 	void *ifn;
2596 	struct sctp_ifn *sctp_ifn;
2597 	struct sctp_ifa *sctp_ifa, *sifa;
2598 	uint8_t start_at_beginning = 0;
2599 	struct sctp_vrf *vrf;
2600 	uint32_t ifn_index;
2601 
2602 	/*
2603 	 * first question, is the ifn we will emit on in our list, if so, we
2604 	 * want that one.
2605 	 */
2606 	vrf = sctp_find_vrf(vrf_id);
2607 	if (vrf == NULL)
2608 		return (NULL);
2609 
2610 	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2611 	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2612 	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2613 
2614 	/*
2615 	 * first question, is the ifn we will emit on in our list?  If so,
2616 	 * we want that one. First we look for a preferred. Second, we go
2617 	 * for an acceptable.
2618 	 */
2619 	if (sctp_ifn) {
2620 		/* first try for a preferred address on the ep */
2621 		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2622 #ifdef INET
2623 			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2624 			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2625 			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2626 				continue;
2627 			}
2628 #endif
2629 #ifdef INET6
2630 			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2631 			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2632 			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2633 				continue;
2634 			}
2635 #endif
2636 			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2637 				continue;
2638 			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2639 				sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2640 				if (sifa == NULL)
2641 					continue;
2642 				if (((non_asoc_addr_ok == 0) &&
2643 				    (sctp_is_addr_restricted(stcb, sifa))) ||
2644 				    (non_asoc_addr_ok &&
2645 				    (sctp_is_addr_restricted(stcb, sifa)) &&
2646 				    (!sctp_is_addr_pending(stcb, sifa)))) {
2647 					/* on the no-no list */
2648 					continue;
2649 				}
2650 				atomic_add_int(&sifa->refcount, 1);
2651 				return (sifa);
2652 			}
2653 		}
2654 		/* next try for an acceptable address on the ep */
2655 		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2656 #ifdef INET
2657 			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2658 			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2659 			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2660 				continue;
2661 			}
2662 #endif
2663 #ifdef INET6
2664 			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2665 			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2666 			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2667 				continue;
2668 			}
2669 #endif
2670 			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2671 				continue;
2672 			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2673 				sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2674 				if (sifa == NULL)
2675 					continue;
2676 				if (((non_asoc_addr_ok == 0) &&
2677 				    (sctp_is_addr_restricted(stcb, sifa))) ||
2678 				    (non_asoc_addr_ok &&
2679 				    (sctp_is_addr_restricted(stcb, sifa)) &&
2680 				    (!sctp_is_addr_pending(stcb, sifa)))) {
2681 					/* on the no-no list */
2682 					continue;
2683 				}
2684 				atomic_add_int(&sifa->refcount, 1);
2685 				return (sifa);
2686 			}
2687 		}
2688 
2689 	}
2690 	/*
2691 	 * if we can't find one like that then we must look at all addresses
2692 	 * bound to pick one at first preferable then secondly acceptable.
2693 	 */
2694 	starting_point = stcb->asoc.last_used_address;
2695 sctp_from_the_top:
2696 	if (stcb->asoc.last_used_address == NULL) {
2697 		start_at_beginning = 1;
2698 		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2699 	}
2700 	/* search beginning with the last used address */
2701 	for (laddr = stcb->asoc.last_used_address; laddr;
2702 	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2703 		if (laddr->ifa == NULL) {
2704 			/* address has been removed */
2705 			continue;
2706 		}
2707 		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2708 			/* address is being deleted */
2709 			continue;
2710 		}
2711 		sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2712 		if (sifa == NULL)
2713 			continue;
2714 		if (((non_asoc_addr_ok == 0) &&
2715 		    (sctp_is_addr_restricted(stcb, sifa))) ||
2716 		    (non_asoc_addr_ok &&
2717 		    (sctp_is_addr_restricted(stcb, sifa)) &&
2718 		    (!sctp_is_addr_pending(stcb, sifa)))) {
2719 			/* on the no-no list */
2720 			continue;
2721 		}
2722 		stcb->asoc.last_used_address = laddr;
2723 		atomic_add_int(&sifa->refcount, 1);
2724 		return (sifa);
2725 	}
2726 	if (start_at_beginning == 0) {
2727 		stcb->asoc.last_used_address = NULL;
2728 		goto sctp_from_the_top;
2729 	}
2730 	/* now try for any higher scope than the destination */
2731 	stcb->asoc.last_used_address = starting_point;
2732 	start_at_beginning = 0;
2733 sctp_from_the_top2:
2734 	if (stcb->asoc.last_used_address == NULL) {
2735 		start_at_beginning = 1;
2736 		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2737 	}
2738 	/* search beginning with the last used address */
2739 	for (laddr = stcb->asoc.last_used_address; laddr;
2740 	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2741 		if (laddr->ifa == NULL) {
2742 			/* address has been removed */
2743 			continue;
2744 		}
2745 		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2746 			/* address is being deleted */
2747 			continue;
2748 		}
2749 		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2750 		    dest_is_priv, fam);
2751 		if (sifa == NULL)
2752 			continue;
2753 		if (((non_asoc_addr_ok == 0) &&
2754 		    (sctp_is_addr_restricted(stcb, sifa))) ||
2755 		    (non_asoc_addr_ok &&
2756 		    (sctp_is_addr_restricted(stcb, sifa)) &&
2757 		    (!sctp_is_addr_pending(stcb, sifa)))) {
2758 			/* on the no-no list */
2759 			continue;
2760 		}
2761 		stcb->asoc.last_used_address = laddr;
2762 		atomic_add_int(&sifa->refcount, 1);
2763 		return (sifa);
2764 	}
2765 	if (start_at_beginning == 0) {
2766 		stcb->asoc.last_used_address = NULL;
2767 		goto sctp_from_the_top2;
2768 	}
2769 	return (NULL);
2770 }
2771 
2772 static struct sctp_ifa *
2773 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2774     struct sctp_inpcb *inp,
2775     struct sctp_tcb *stcb,
2776     int non_asoc_addr_ok,
2777     uint8_t dest_is_loop,
2778     uint8_t dest_is_priv,
2779     int addr_wanted,
2780     sa_family_t fam,
2781     sctp_route_t *ro
2782 )
2783 {
2784 	struct sctp_ifa *ifa, *sifa;
2785 	int num_eligible_addr = 0;
2786 #ifdef INET6
2787 	struct sockaddr_in6 sin6, lsa6;
2788 
2789 	if (fam == AF_INET6) {
2790 		memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2791 		(void)sa6_recoverscope(&sin6);
2792 	}
2793 #endif				/* INET6 */
2794 	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2795 #ifdef INET
2796 		if ((ifa->address.sa.sa_family == AF_INET) &&
2797 		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2798 		    &ifa->address.sin.sin_addr) != 0)) {
2799 			continue;
2800 		}
2801 #endif
2802 #ifdef INET6
2803 		if ((ifa->address.sa.sa_family == AF_INET6) &&
2804 		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2805 		    &ifa->address.sin6.sin6_addr) != 0)) {
2806 			continue;
2807 		}
2808 #endif
2809 		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2810 		    (non_asoc_addr_ok == 0))
2811 			continue;
2812 		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2813 		    dest_is_priv, fam);
2814 		if (sifa == NULL)
2815 			continue;
2816 #ifdef INET6
2817 		if (fam == AF_INET6 &&
2818 		    dest_is_loop &&
2819 		    sifa->src_is_loop && sifa->src_is_priv) {
2820 			/*
2821 			 * don't allow fe80::1 to be a src on loop ::1, we
2822 			 * don't list it to the peer so we will get an
2823 			 * abort.
2824 			 */
2825 			continue;
2826 		}
2827 		if (fam == AF_INET6 &&
2828 		    IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2829 		    IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2830 			/*
2831 			 * link-local <-> link-local must belong to the same
2832 			 * scope.
2833 			 */
2834 			memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2835 			(void)sa6_recoverscope(&lsa6);
2836 			if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2837 				continue;
2838 			}
2839 		}
2840 #endif				/* INET6 */
2841 
2842 		/*
2843 		 * Check if the IPv6 address matches to next-hop. In the
2844 		 * mobile case, old IPv6 address may be not deleted from the
2845 		 * interface. Then, the interface has previous and new
2846 		 * addresses.  We should use one corresponding to the
2847 		 * next-hop.  (by micchie)
2848 		 */
2849 #ifdef INET6
2850 		if (stcb && fam == AF_INET6 &&
2851 		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2852 			if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2853 			    == 0) {
2854 				continue;
2855 			}
2856 		}
2857 #endif
2858 #ifdef INET
2859 		/* Avoid topologically incorrect IPv4 address */
2860 		if (stcb && fam == AF_INET &&
2861 		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2862 			if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2863 				continue;
2864 			}
2865 		}
2866 #endif
2867 		if (stcb) {
2868 			if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2869 				continue;
2870 			}
2871 			if (((non_asoc_addr_ok == 0) &&
2872 			    (sctp_is_addr_restricted(stcb, sifa))) ||
2873 			    (non_asoc_addr_ok &&
2874 			    (sctp_is_addr_restricted(stcb, sifa)) &&
2875 			    (!sctp_is_addr_pending(stcb, sifa)))) {
2876 				/*
2877 				 * It is restricted for some reason..
2878 				 * probably not yet added.
2879 				 */
2880 				continue;
2881 			}
2882 		}
2883 		if (num_eligible_addr >= addr_wanted) {
2884 			return (sifa);
2885 		}
2886 		num_eligible_addr++;
2887 	}
2888 	return (NULL);
2889 }
2890 
2891 
2892 static int
2893 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2894     struct sctp_inpcb *inp,
2895     struct sctp_tcb *stcb,
2896     int non_asoc_addr_ok,
2897     uint8_t dest_is_loop,
2898     uint8_t dest_is_priv,
2899     sa_family_t fam)
2900 {
2901 	struct sctp_ifa *ifa, *sifa;
2902 	int num_eligible_addr = 0;
2903 
2904 	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2905 #ifdef INET
2906 		if ((ifa->address.sa.sa_family == AF_INET) &&
2907 		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2908 		    &ifa->address.sin.sin_addr) != 0)) {
2909 			continue;
2910 		}
2911 #endif
2912 #ifdef INET6
2913 		if ((ifa->address.sa.sa_family == AF_INET6) &&
2914 		    (stcb != NULL) &&
2915 		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2916 		    &ifa->address.sin6.sin6_addr) != 0)) {
2917 			continue;
2918 		}
2919 #endif
2920 		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2921 		    (non_asoc_addr_ok == 0)) {
2922 			continue;
2923 		}
2924 		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2925 		    dest_is_priv, fam);
2926 		if (sifa == NULL) {
2927 			continue;
2928 		}
2929 		if (stcb) {
2930 			if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2931 				continue;
2932 			}
2933 			if (((non_asoc_addr_ok == 0) &&
2934 			    (sctp_is_addr_restricted(stcb, sifa))) ||
2935 			    (non_asoc_addr_ok &&
2936 			    (sctp_is_addr_restricted(stcb, sifa)) &&
2937 			    (!sctp_is_addr_pending(stcb, sifa)))) {
2938 				/*
2939 				 * It is restricted for some reason..
2940 				 * probably not yet added.
2941 				 */
2942 				continue;
2943 			}
2944 		}
2945 		num_eligible_addr++;
2946 	}
2947 	return (num_eligible_addr);
2948 }
2949 
2950 static struct sctp_ifa *
2951 sctp_choose_boundall(struct sctp_inpcb *inp,
2952     struct sctp_tcb *stcb,
2953     struct sctp_nets *net,
2954     sctp_route_t *ro,
2955     uint32_t vrf_id,
2956     uint8_t dest_is_priv,
2957     uint8_t dest_is_loop,
2958     int non_asoc_addr_ok,
2959     sa_family_t fam)
2960 {
2961 	int cur_addr_num = 0, num_preferred = 0;
2962 	void *ifn;
2963 	struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2964 	struct sctp_ifa *sctp_ifa, *sifa;
2965 	uint32_t ifn_index;
2966 	struct sctp_vrf *vrf;
2967 #ifdef INET
2968 	int retried = 0;
2969 #endif
2970 
2971 	/*-
2972 	 * For boundall we can use any address in the association.
2973 	 * If non_asoc_addr_ok is set we can use any address (at least in
2974 	 * theory). So we look for preferred addresses first. If we find one,
2975 	 * we use it. Otherwise we next try to get an address on the
2976 	 * interface, which we should be able to do (unless non_asoc_addr_ok
2977 	 * is false and we are routed out that way). In these cases where we
2978 	 * can't use the address of the interface we go through all the
2979 	 * ifn's looking for an address we can use and fill that in. Punting
2980 	 * means we send back address 0, which will probably cause problems
2981 	 * actually since then IP will fill in the address of the route ifn,
2982 	 * which means we probably already rejected it.. i.e. here comes an
2983 	 * abort :-<.
2984 	 */
2985 	vrf = sctp_find_vrf(vrf_id);
2986 	if (vrf == NULL)
2987 		return (NULL);
2988 
2989 	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2990 	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2991 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2992 	emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2993 	if (sctp_ifn == NULL) {
2994 		/* ?? We don't have this guy ?? */
2995 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2996 		goto bound_all_plan_b;
2997 	}
2998 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2999 	    ifn_index, sctp_ifn->ifn_name);
3000 
3001 	if (net) {
3002 		cur_addr_num = net->indx_of_eligible_next_to_use;
3003 	}
3004 	num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3005 	    inp, stcb,
3006 	    non_asoc_addr_ok,
3007 	    dest_is_loop,
3008 	    dest_is_priv, fam);
3009 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3010 	    num_preferred, sctp_ifn->ifn_name);
3011 	if (num_preferred == 0) {
3012 		/*
3013 		 * no eligible addresses, we must use some other interface
3014 		 * address if we can find one.
3015 		 */
3016 		goto bound_all_plan_b;
3017 	}
3018 	/*
3019 	 * Ok we have num_eligible_addr set with how many we can use, this
3020 	 * may vary from call to call due to addresses being deprecated
3021 	 * etc..
3022 	 */
3023 	if (cur_addr_num >= num_preferred) {
3024 		cur_addr_num = 0;
3025 	}
3026 	/*
3027 	 * select the nth address from the list (where cur_addr_num is the
3028 	 * nth) and 0 is the first one, 1 is the second one etc...
3029 	 */
3030 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3031 
3032 	sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3033 	    dest_is_priv, cur_addr_num, fam, ro);
3034 
3035 	/* if sctp_ifa is NULL something changed??, fall to plan b. */
3036 	if (sctp_ifa) {
3037 		atomic_add_int(&sctp_ifa->refcount, 1);
3038 		if (net) {
3039 			/* save off where the next one we will want */
3040 			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3041 		}
3042 		return (sctp_ifa);
3043 	}
3044 	/*
3045 	 * plan_b: Look at all interfaces and find a preferred address. If
3046 	 * no preferred fall through to plan_c.
3047 	 */
3048 bound_all_plan_b:
3049 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3050 	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3051 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3052 		    sctp_ifn->ifn_name);
3053 		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3054 			/* wrong base scope */
3055 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3056 			continue;
3057 		}
3058 		if ((sctp_ifn == looked_at) && looked_at) {
3059 			/* already looked at this guy */
3060 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3061 			continue;
3062 		}
3063 		num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3064 		    dest_is_loop, dest_is_priv, fam);
3065 		SCTPDBG(SCTP_DEBUG_OUTPUT2,
3066 		    "Found ifn:%p %d preferred source addresses\n",
3067 		    ifn, num_preferred);
3068 		if (num_preferred == 0) {
3069 			/* None on this interface. */
3070 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
3071 			continue;
3072 		}
3073 		SCTPDBG(SCTP_DEBUG_OUTPUT2,
3074 		    "num preferred:%d on interface:%p cur_addr_num:%d\n",
3075 		    num_preferred, (void *)sctp_ifn, cur_addr_num);
3076 
3077 		/*
3078 		 * Ok we have num_eligible_addr set with how many we can
3079 		 * use, this may vary from call to call due to addresses
3080 		 * being deprecated etc..
3081 		 */
3082 		if (cur_addr_num >= num_preferred) {
3083 			cur_addr_num = 0;
3084 		}
3085 		sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3086 		    dest_is_priv, cur_addr_num, fam, ro);
3087 		if (sifa == NULL)
3088 			continue;
3089 		if (net) {
3090 			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3091 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3092 			    cur_addr_num);
3093 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3094 			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3095 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3096 			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3097 		}
3098 		atomic_add_int(&sifa->refcount, 1);
3099 		return (sifa);
3100 	}
3101 #ifdef INET
3102 again_with_private_addresses_allowed:
3103 #endif
3104 	/* plan_c: do we have an acceptable address on the emit interface */
3105 	sifa = NULL;
3106 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3107 	if (emit_ifn == NULL) {
3108 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3109 		goto plan_d;
3110 	}
3111 	LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3112 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3113 #ifdef INET
3114 		if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3115 		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3116 		    &sctp_ifa->address.sin.sin_addr) != 0)) {
3117 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3118 			continue;
3119 		}
3120 #endif
3121 #ifdef INET6
3122 		if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3123 		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3124 		    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3125 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3126 			continue;
3127 		}
3128 #endif
3129 		if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3130 		    (non_asoc_addr_ok == 0)) {
3131 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3132 			continue;
3133 		}
3134 		sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3135 		    dest_is_priv, fam);
3136 		if (sifa == NULL) {
3137 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3138 			continue;
3139 		}
3140 		if (stcb) {
3141 			if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3142 				SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3143 				sifa = NULL;
3144 				continue;
3145 			}
3146 			if (((non_asoc_addr_ok == 0) &&
3147 			    (sctp_is_addr_restricted(stcb, sifa))) ||
3148 			    (non_asoc_addr_ok &&
3149 			    (sctp_is_addr_restricted(stcb, sifa)) &&
3150 			    (!sctp_is_addr_pending(stcb, sifa)))) {
3151 				/*
3152 				 * It is restricted for some reason..
3153 				 * probably not yet added.
3154 				 */
3155 				SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
3156 				sifa = NULL;
3157 				continue;
3158 			}
3159 		}
3160 		atomic_add_int(&sifa->refcount, 1);
3161 		goto out;
3162 	}
3163 plan_d:
3164 	/*
3165 	 * plan_d: We are in trouble. No preferred address on the emit
3166 	 * interface. And not even a preferred address on all interfaces. Go
3167 	 * out and see if we can find an acceptable address somewhere
3168 	 * amongst all interfaces.
3169 	 */
3170 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3171 	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3172 		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3173 			/* wrong base scope */
3174 			continue;
3175 		}
3176 		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3177 #ifdef INET
3178 			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3179 			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3180 			    &sctp_ifa->address.sin.sin_addr) != 0)) {
3181 				continue;
3182 			}
3183 #endif
3184 #ifdef INET6
3185 			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3186 			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3187 			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3188 				continue;
3189 			}
3190 #endif
3191 			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3192 			    (non_asoc_addr_ok == 0))
3193 				continue;
3194 			sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3195 			    dest_is_loop,
3196 			    dest_is_priv, fam);
3197 			if (sifa == NULL)
3198 				continue;
3199 			if (stcb) {
3200 				if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3201 					sifa = NULL;
3202 					continue;
3203 				}
3204 				if (((non_asoc_addr_ok == 0) &&
3205 				    (sctp_is_addr_restricted(stcb, sifa))) ||
3206 				    (non_asoc_addr_ok &&
3207 				    (sctp_is_addr_restricted(stcb, sifa)) &&
3208 				    (!sctp_is_addr_pending(stcb, sifa)))) {
3209 					/*
3210 					 * It is restricted for some
3211 					 * reason.. probably not yet added.
3212 					 */
3213 					sifa = NULL;
3214 					continue;
3215 				}
3216 			}
3217 			goto out;
3218 		}
3219 	}
3220 #ifdef INET
3221 	if (stcb) {
3222 		if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3223 			stcb->asoc.scope.ipv4_local_scope = 1;
3224 			retried = 1;
3225 			goto again_with_private_addresses_allowed;
3226 		} else if (retried == 1) {
3227 			stcb->asoc.scope.ipv4_local_scope = 0;
3228 		}
3229 	}
3230 #endif
3231 out:
3232 #ifdef INET
3233 	if (sifa) {
3234 		if (retried == 1) {
3235 			LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3236 				if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3237 					/* wrong base scope */
3238 					continue;
3239 				}
3240 				LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3241 					struct sctp_ifa *tmp_sifa;
3242 
3243 #ifdef INET
3244 					if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3245 					    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3246 					    &sctp_ifa->address.sin.sin_addr) != 0)) {
3247 						continue;
3248 					}
3249 #endif
3250 #ifdef INET6
3251 					if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3252 					    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3253 					    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3254 						continue;
3255 					}
3256 #endif
3257 					if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3258 					    (non_asoc_addr_ok == 0))
3259 						continue;
3260 					tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3261 					    dest_is_loop,
3262 					    dest_is_priv, fam);
3263 					if (tmp_sifa == NULL) {
3264 						continue;
3265 					}
3266 					if (tmp_sifa == sifa) {
3267 						continue;
3268 					}
3269 					if (stcb) {
3270 						if (sctp_is_address_in_scope(tmp_sifa,
3271 						    &stcb->asoc.scope, 0) == 0) {
3272 							continue;
3273 						}
3274 						if (((non_asoc_addr_ok == 0) &&
3275 						    (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3276 						    (non_asoc_addr_ok &&
3277 						    (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3278 						    (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3279 							/*
3280 							 * It is restricted
3281 							 * for some reason..
3282 							 * probably not yet
3283 							 * added.
3284 							 */
3285 							continue;
3286 						}
3287 					}
3288 					if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3289 					    (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3290 						sctp_add_local_addr_restricted(stcb, tmp_sifa);
3291 					}
3292 				}
3293 			}
3294 		}
3295 		atomic_add_int(&sifa->refcount, 1);
3296 	}
3297 #endif
3298 	return (sifa);
3299 }
3300 
3301 
3302 
3303 /* tcb may be NULL */
3304 struct sctp_ifa *
3305 sctp_source_address_selection(struct sctp_inpcb *inp,
3306     struct sctp_tcb *stcb,
3307     sctp_route_t *ro,
3308     struct sctp_nets *net,
3309     int non_asoc_addr_ok, uint32_t vrf_id)
3310 {
3311 	struct sctp_ifa *answer;
3312 	uint8_t dest_is_priv, dest_is_loop;
3313 	sa_family_t fam;
3314 #ifdef INET
3315 	struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3316 #endif
3317 #ifdef INET6
3318 	struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3319 #endif
3320 
3321 	/**
3322 	 * Rules:
3323 	 * - Find the route if needed, cache if I can.
3324 	 * - Look at interface address in route, Is it in the bound list. If so we
3325 	 *   have the best source.
3326 	 * - If not we must rotate amongst the addresses.
3327 	 *
3328 	 * Cavets and issues
3329 	 *
3330 	 * Do we need to pay attention to scope. We can have a private address
3331 	 * or a global address we are sourcing or sending to. So if we draw
3332 	 * it out
3333 	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3334 	 * For V4
3335 	 * ------------------------------------------
3336 	 *      source     *      dest  *  result
3337 	 * -----------------------------------------
3338 	 * <a>  Private    *    Global  *  NAT
3339 	 * -----------------------------------------
3340 	 * <b>  Private    *    Private *  No problem
3341 	 * -----------------------------------------
3342 	 * <c>  Global     *    Private *  Huh, How will this work?
3343 	 * -----------------------------------------
3344 	 * <d>  Global     *    Global  *  No Problem
3345 	 *------------------------------------------
3346 	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3347 	 * For V6
3348 	 *------------------------------------------
3349 	 *      source     *      dest  *  result
3350 	 * -----------------------------------------
3351 	 * <a>  Linklocal  *    Global  *
3352 	 * -----------------------------------------
3353 	 * <b>  Linklocal  * Linklocal  *  No problem
3354 	 * -----------------------------------------
3355 	 * <c>  Global     * Linklocal  *  Huh, How will this work?
3356 	 * -----------------------------------------
3357 	 * <d>  Global     *    Global  *  No Problem
3358 	 *------------------------------------------
3359 	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3360 	 *
3361 	 * And then we add to that what happens if there are multiple addresses
3362 	 * assigned to an interface. Remember the ifa on a ifn is a linked
3363 	 * list of addresses. So one interface can have more than one IP
3364 	 * address. What happens if we have both a private and a global
3365 	 * address? Do we then use context of destination to sort out which
3366 	 * one is best? And what about NAT's sending P->G may get you a NAT
3367 	 * translation, or should you select the G thats on the interface in
3368 	 * preference.
3369 	 *
3370 	 * Decisions:
3371 	 *
3372 	 * - count the number of addresses on the interface.
3373 	 * - if it is one, no problem except case <c>.
3374 	 *   For <a> we will assume a NAT out there.
3375 	 * - if there are more than one, then we need to worry about scope P
3376 	 *   or G. We should prefer G -> G and P -> P if possible.
3377 	 *   Then as a secondary fall back to mixed types G->P being a last
3378 	 *   ditch one.
3379 	 * - The above all works for bound all, but bound specific we need to
3380 	 *   use the same concept but instead only consider the bound
3381 	 *   addresses. If the bound set is NOT assigned to the interface then
3382 	 *   we must use rotation amongst the bound addresses..
3383 	 */
3384 	if (ro->ro_rt == NULL) {
3385 		/*
3386 		 * Need a route to cache.
3387 		 */
3388 		SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
3389 	}
3390 	if (ro->ro_rt == NULL) {
3391 		return (NULL);
3392 	}
3393 	fam = ro->ro_dst.sa_family;
3394 	dest_is_priv = dest_is_loop = 0;
3395 	/* Setup our scopes for the destination */
3396 	switch (fam) {
3397 #ifdef INET
3398 	case AF_INET:
3399 		/* Scope based on outbound address */
3400 		if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3401 			dest_is_loop = 1;
3402 			if (net != NULL) {
3403 				/* mark it as local */
3404 				net->addr_is_local = 1;
3405 			}
3406 		} else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3407 			dest_is_priv = 1;
3408 		}
3409 		break;
3410 #endif
3411 #ifdef INET6
3412 	case AF_INET6:
3413 		/* Scope based on outbound address */
3414 		if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3415 		    SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3416 			/*
3417 			 * If the address is a loopback address, which
3418 			 * consists of "::1" OR "fe80::1%lo0", we are
3419 			 * loopback scope. But we don't use dest_is_priv
3420 			 * (link local addresses).
3421 			 */
3422 			dest_is_loop = 1;
3423 			if (net != NULL) {
3424 				/* mark it as local */
3425 				net->addr_is_local = 1;
3426 			}
3427 		} else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3428 			dest_is_priv = 1;
3429 		}
3430 		break;
3431 #endif
3432 	}
3433 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3434 	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3435 	SCTP_IPI_ADDR_RLOCK();
3436 	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3437 		/*
3438 		 * Bound all case
3439 		 */
3440 		answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3441 		    dest_is_priv, dest_is_loop,
3442 		    non_asoc_addr_ok, fam);
3443 		SCTP_IPI_ADDR_RUNLOCK();
3444 		return (answer);
3445 	}
3446 	/*
3447 	 * Subset bound case
3448 	 */
3449 	if (stcb) {
3450 		answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3451 		    vrf_id, dest_is_priv,
3452 		    dest_is_loop,
3453 		    non_asoc_addr_ok, fam);
3454 	} else {
3455 		answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3456 		    non_asoc_addr_ok,
3457 		    dest_is_priv,
3458 		    dest_is_loop, fam);
3459 	}
3460 	SCTP_IPI_ADDR_RUNLOCK();
3461 	return (answer);
3462 }
3463 
3464 static int
3465 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3466 {
3467 	struct cmsghdr cmh;
3468 	int tlen, at, found;
3469 	struct sctp_sndinfo sndinfo;
3470 	struct sctp_prinfo prinfo;
3471 	struct sctp_authinfo authinfo;
3472 
3473 	tlen = SCTP_BUF_LEN(control);
3474 	at = 0;
3475 	found = 0;
3476 	/*
3477 	 * Independent of how many mbufs, find the c_type inside the control
3478 	 * structure and copy out the data.
3479 	 */
3480 	while (at < tlen) {
3481 		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3482 			/* There is not enough room for one more. */
3483 			return (found);
3484 		}
3485 		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3486 		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3487 			/* We dont't have a complete CMSG header. */
3488 			return (found);
3489 		}
3490 		if (((int)cmh.cmsg_len + at) > tlen) {
3491 			/* We don't have the complete CMSG. */
3492 			return (found);
3493 		}
3494 		if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3495 		    ((c_type == cmh.cmsg_type) ||
3496 		    ((c_type == SCTP_SNDRCV) &&
3497 		    ((cmh.cmsg_type == SCTP_SNDINFO) ||
3498 		    (cmh.cmsg_type == SCTP_PRINFO) ||
3499 		    (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3500 			if (c_type == cmh.cmsg_type) {
3501 				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3502 					return (found);
3503 				}
3504 				/* It is exactly what we want. Copy it out. */
3505 				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), (int)cpsize, (caddr_t)data);
3506 				return (1);
3507 			} else {
3508 				struct sctp_sndrcvinfo *sndrcvinfo;
3509 
3510 				sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3511 				if (found == 0) {
3512 					if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3513 						return (found);
3514 					}
3515 					memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3516 				}
3517 				switch (cmh.cmsg_type) {
3518 				case SCTP_SNDINFO:
3519 					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3520 						return (found);
3521 					}
3522 					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3523 					sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3524 					sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3525 					sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3526 					sndrcvinfo->sinfo_context = sndinfo.snd_context;
3527 					sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3528 					break;
3529 				case SCTP_PRINFO:
3530 					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3531 						return (found);
3532 					}
3533 					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3534 					if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3535 						sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3536 					} else {
3537 						sndrcvinfo->sinfo_timetolive = 0;
3538 					}
3539 					sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3540 					break;
3541 				case SCTP_AUTHINFO:
3542 					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3543 						return (found);
3544 					}
3545 					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3546 					sndrcvinfo->sinfo_keynumber_valid = 1;
3547 					sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3548 					break;
3549 				default:
3550 					return (found);
3551 				}
3552 				found = 1;
3553 			}
3554 		}
3555 		at += CMSG_ALIGN(cmh.cmsg_len);
3556 	}
3557 	return (found);
3558 }
3559 
3560 static int
3561 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3562 {
3563 	struct cmsghdr cmh;
3564 	int tlen, at;
3565 	struct sctp_initmsg initmsg;
3566 #ifdef INET
3567 	struct sockaddr_in sin;
3568 #endif
3569 #ifdef INET6
3570 	struct sockaddr_in6 sin6;
3571 #endif
3572 
3573 	tlen = SCTP_BUF_LEN(control);
3574 	at = 0;
3575 	while (at < tlen) {
3576 		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3577 			/* There is not enough room for one more. */
3578 			*error = EINVAL;
3579 			return (1);
3580 		}
3581 		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3582 		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3583 			/* We dont't have a complete CMSG header. */
3584 			*error = EINVAL;
3585 			return (1);
3586 		}
3587 		if (((int)cmh.cmsg_len + at) > tlen) {
3588 			/* We don't have the complete CMSG. */
3589 			*error = EINVAL;
3590 			return (1);
3591 		}
3592 		if (cmh.cmsg_level == IPPROTO_SCTP) {
3593 			switch (cmh.cmsg_type) {
3594 			case SCTP_INIT:
3595 				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3596 					*error = EINVAL;
3597 					return (1);
3598 				}
3599 				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3600 				if (initmsg.sinit_max_attempts)
3601 					stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3602 				if (initmsg.sinit_num_ostreams)
3603 					stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3604 				if (initmsg.sinit_max_instreams)
3605 					stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3606 				if (initmsg.sinit_max_init_timeo)
3607 					stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3608 				if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3609 					struct sctp_stream_out *tmp_str;
3610 					unsigned int i;
3611 #if defined(SCTP_DETAILED_STR_STATS)
3612 					int j;
3613 #endif
3614 
3615 					/* Default is NOT correct */
3616 					SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3617 					    stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3618 					SCTP_TCB_UNLOCK(stcb);
3619 					SCTP_MALLOC(tmp_str,
3620 					    struct sctp_stream_out *,
3621 					    (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3622 					    SCTP_M_STRMO);
3623 					SCTP_TCB_LOCK(stcb);
3624 					if (tmp_str != NULL) {
3625 						SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3626 						stcb->asoc.strmout = tmp_str;
3627 						stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3628 					} else {
3629 						stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3630 					}
3631 					for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3632 						TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3633 						stcb->asoc.strmout[i].chunks_on_queues = 0;
3634 						stcb->asoc.strmout[i].next_mid_ordered = 0;
3635 						stcb->asoc.strmout[i].next_mid_unordered = 0;
3636 #if defined(SCTP_DETAILED_STR_STATS)
3637 						for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
3638 							stcb->asoc.strmout[i].abandoned_sent[j] = 0;
3639 							stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
3640 						}
3641 #else
3642 						stcb->asoc.strmout[i].abandoned_sent[0] = 0;
3643 						stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
3644 #endif
3645 						stcb->asoc.strmout[i].sid = i;
3646 						stcb->asoc.strmout[i].last_msg_incomplete = 0;
3647 						stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
3648 						stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
3649 					}
3650 				}
3651 				break;
3652 #ifdef INET
3653 			case SCTP_DSTADDRV4:
3654 				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3655 					*error = EINVAL;
3656 					return (1);
3657 				}
3658 				memset(&sin, 0, sizeof(struct sockaddr_in));
3659 				sin.sin_family = AF_INET;
3660 				sin.sin_len = sizeof(struct sockaddr_in);
3661 				sin.sin_port = stcb->rport;
3662 				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3663 				if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3664 				    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3665 				    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3666 					*error = EINVAL;
3667 					return (1);
3668 				}
3669 				if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3670 				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3671 					*error = ENOBUFS;
3672 					return (1);
3673 				}
3674 				break;
3675 #endif
3676 #ifdef INET6
3677 			case SCTP_DSTADDRV6:
3678 				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3679 					*error = EINVAL;
3680 					return (1);
3681 				}
3682 				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3683 				sin6.sin6_family = AF_INET6;
3684 				sin6.sin6_len = sizeof(struct sockaddr_in6);
3685 				sin6.sin6_port = stcb->rport;
3686 				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3687 				if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3688 				    IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3689 					*error = EINVAL;
3690 					return (1);
3691 				}
3692 #ifdef INET
3693 				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3694 					in6_sin6_2_sin(&sin, &sin6);
3695 					if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3696 					    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3697 					    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3698 						*error = EINVAL;
3699 						return (1);
3700 					}
3701 					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
3702 					    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3703 						*error = ENOBUFS;
3704 						return (1);
3705 					}
3706 				} else
3707 #endif
3708 					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
3709 				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3710 					*error = ENOBUFS;
3711 					return (1);
3712 				}
3713 				break;
3714 #endif
3715 			default:
3716 				break;
3717 			}
3718 		}
3719 		at += CMSG_ALIGN(cmh.cmsg_len);
3720 	}
3721 	return (0);
3722 }
3723 
3724 static struct sctp_tcb *
3725 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3726     uint16_t port,
3727     struct mbuf *control,
3728     struct sctp_nets **net_p,
3729     int *error)
3730 {
3731 	struct cmsghdr cmh;
3732 	int tlen, at;
3733 	struct sctp_tcb *stcb;
3734 	struct sockaddr *addr;
3735 #ifdef INET
3736 	struct sockaddr_in sin;
3737 #endif
3738 #ifdef INET6
3739 	struct sockaddr_in6 sin6;
3740 #endif
3741 
3742 	tlen = SCTP_BUF_LEN(control);
3743 	at = 0;
3744 	while (at < tlen) {
3745 		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3746 			/* There is not enough room for one more. */
3747 			*error = EINVAL;
3748 			return (NULL);
3749 		}
3750 		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3751 		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3752 			/* We dont't have a complete CMSG header. */
3753 			*error = EINVAL;
3754 			return (NULL);
3755 		}
3756 		if (((int)cmh.cmsg_len + at) > tlen) {
3757 			/* We don't have the complete CMSG. */
3758 			*error = EINVAL;
3759 			return (NULL);
3760 		}
3761 		if (cmh.cmsg_level == IPPROTO_SCTP) {
3762 			switch (cmh.cmsg_type) {
3763 #ifdef INET
3764 			case SCTP_DSTADDRV4:
3765 				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3766 					*error = EINVAL;
3767 					return (NULL);
3768 				}
3769 				memset(&sin, 0, sizeof(struct sockaddr_in));
3770 				sin.sin_family = AF_INET;
3771 				sin.sin_len = sizeof(struct sockaddr_in);
3772 				sin.sin_port = port;
3773 				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3774 				addr = (struct sockaddr *)&sin;
3775 				break;
3776 #endif
3777 #ifdef INET6
3778 			case SCTP_DSTADDRV6:
3779 				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3780 					*error = EINVAL;
3781 					return (NULL);
3782 				}
3783 				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3784 				sin6.sin6_family = AF_INET6;
3785 				sin6.sin6_len = sizeof(struct sockaddr_in6);
3786 				sin6.sin6_port = port;
3787 				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3788 #ifdef INET
3789 				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3790 					in6_sin6_2_sin(&sin, &sin6);
3791 					addr = (struct sockaddr *)&sin;
3792 				} else
3793 #endif
3794 					addr = (struct sockaddr *)&sin6;
3795 				break;
3796 #endif
3797 			default:
3798 				addr = NULL;
3799 				break;
3800 			}
3801 			if (addr) {
3802 				stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3803 				if (stcb != NULL) {
3804 					return (stcb);
3805 				}
3806 			}
3807 		}
3808 		at += CMSG_ALIGN(cmh.cmsg_len);
3809 	}
3810 	return (NULL);
3811 }
3812 
3813 static struct mbuf *
3814 sctp_add_cookie(struct mbuf *init, int init_offset,
3815     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
3816 {
3817 	struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3818 	struct sctp_state_cookie *stc;
3819 	struct sctp_paramhdr *ph;
3820 	uint8_t *foo;
3821 	int sig_offset;
3822 	uint16_t cookie_sz;
3823 
3824 	mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3825 	    sizeof(struct sctp_paramhdr)), 0,
3826 	    M_NOWAIT, 1, MT_DATA);
3827 	if (mret == NULL) {
3828 		return (NULL);
3829 	}
3830 	copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
3831 	if (copy_init == NULL) {
3832 		sctp_m_freem(mret);
3833 		return (NULL);
3834 	}
3835 #ifdef SCTP_MBUF_LOGGING
3836 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3837 		sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
3838 	}
3839 #endif
3840 	copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3841 	    M_NOWAIT);
3842 	if (copy_initack == NULL) {
3843 		sctp_m_freem(mret);
3844 		sctp_m_freem(copy_init);
3845 		return (NULL);
3846 	}
3847 #ifdef SCTP_MBUF_LOGGING
3848 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3849 		sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
3850 	}
3851 #endif
3852 	/* easy side we just drop it on the end */
3853 	ph = mtod(mret, struct sctp_paramhdr *);
3854 	SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3855 	    sizeof(struct sctp_paramhdr);
3856 	stc = (struct sctp_state_cookie *)((caddr_t)ph +
3857 	    sizeof(struct sctp_paramhdr));
3858 	ph->param_type = htons(SCTP_STATE_COOKIE);
3859 	ph->param_length = 0;	/* fill in at the end */
3860 	/* Fill in the stc cookie data */
3861 	memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3862 
3863 	/* tack the INIT and then the INIT-ACK onto the chain */
3864 	cookie_sz = 0;
3865 	for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3866 		cookie_sz += SCTP_BUF_LEN(m_at);
3867 		if (SCTP_BUF_NEXT(m_at) == NULL) {
3868 			SCTP_BUF_NEXT(m_at) = copy_init;
3869 			break;
3870 		}
3871 	}
3872 	for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3873 		cookie_sz += SCTP_BUF_LEN(m_at);
3874 		if (SCTP_BUF_NEXT(m_at) == NULL) {
3875 			SCTP_BUF_NEXT(m_at) = copy_initack;
3876 			break;
3877 		}
3878 	}
3879 	for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3880 		cookie_sz += SCTP_BUF_LEN(m_at);
3881 		if (SCTP_BUF_NEXT(m_at) == NULL) {
3882 			break;
3883 		}
3884 	}
3885 	sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
3886 	if (sig == NULL) {
3887 		/* no space, so free the entire chain */
3888 		sctp_m_freem(mret);
3889 		return (NULL);
3890 	}
3891 	SCTP_BUF_LEN(sig) = 0;
3892 	SCTP_BUF_NEXT(m_at) = sig;
3893 	sig_offset = 0;
3894 	foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
3895 	memset(foo, 0, SCTP_SIGNATURE_SIZE);
3896 	*signature = foo;
3897 	SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3898 	cookie_sz += SCTP_SIGNATURE_SIZE;
3899 	ph->param_length = htons(cookie_sz);
3900 	return (mret);
3901 }
3902 
3903 
3904 static uint8_t
3905 sctp_get_ect(struct sctp_tcb *stcb)
3906 {
3907 	if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
3908 		return (SCTP_ECT0_BIT);
3909 	} else {
3910 		return (0);
3911 	}
3912 }
3913 
3914 #if defined(INET) || defined(INET6)
3915 static void
3916 sctp_handle_no_route(struct sctp_tcb *stcb,
3917     struct sctp_nets *net,
3918     int so_locked)
3919 {
3920 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3921 
3922 	if (net) {
3923 		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3924 		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3925 		if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3926 			if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3927 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3928 				sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3929 				    stcb, 0,
3930 				    (void *)net,
3931 				    so_locked);
3932 				net->dest_state &= ~SCTP_ADDR_REACHABLE;
3933 				net->dest_state &= ~SCTP_ADDR_PF;
3934 			}
3935 		}
3936 		if (stcb) {
3937 			if (net == stcb->asoc.primary_destination) {
3938 				/* need a new primary */
3939 				struct sctp_nets *alt;
3940 
3941 				alt = sctp_find_alternate_net(stcb, net, 0);
3942 				if (alt != net) {
3943 					if (stcb->asoc.alternate) {
3944 						sctp_free_remote_addr(stcb->asoc.alternate);
3945 					}
3946 					stcb->asoc.alternate = alt;
3947 					atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3948 					if (net->ro._s_addr) {
3949 						sctp_free_ifa(net->ro._s_addr);
3950 						net->ro._s_addr = NULL;
3951 					}
3952 					net->src_addr_selected = 0;
3953 				}
3954 			}
3955 		}
3956 	}
3957 }
3958 #endif
3959 
3960 static int
3961 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3962     struct sctp_tcb *stcb,	/* may be NULL */
3963     struct sctp_nets *net,
3964     struct sockaddr *to,
3965     struct mbuf *m,
3966     uint32_t auth_offset,
3967     struct sctp_auth_chunk *auth,
3968     uint16_t auth_keyid,
3969     int nofragment_flag,
3970     int ecn_ok,
3971     int out_of_asoc_ok,
3972     uint16_t src_port,
3973     uint16_t dest_port,
3974     uint32_t v_tag,
3975     uint16_t port,
3976     union sctp_sockstore *over_addr,
3977     uint8_t mflowtype, uint32_t mflowid,
3978 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3979     int so_locked SCTP_UNUSED
3980 #else
3981     int so_locked
3982 #endif
3983 )
3984 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3985 {
3986 	/**
3987 	 * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3988 	 * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3989 	 * - fill in the HMAC digest of any AUTH chunk in the packet.
3990 	 * - calculate and fill in the SCTP checksum.
3991 	 * - prepend an IP address header.
3992 	 * - if boundall use INADDR_ANY.
3993 	 * - if boundspecific do source address selection.
3994 	 * - set fragmentation option for ipV4.
3995 	 * - On return from IP output, check/adjust mtu size of output
3996 	 *   interface and smallest_mtu size as well.
3997 	 */
3998 	/* Will need ifdefs around this */
3999 	struct mbuf *newm;
4000 	struct sctphdr *sctphdr;
4001 	int packet_length;
4002 	int ret;
4003 #if defined(INET) || defined(INET6)
4004 	uint32_t vrf_id;
4005 #endif
4006 #if defined(INET) || defined(INET6)
4007 	struct mbuf *o_pak;
4008 	sctp_route_t *ro = NULL;
4009 	struct udphdr *udp = NULL;
4010 #endif
4011 	uint8_t tos_value;
4012 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4013 	struct socket *so = NULL;
4014 #endif
4015 
4016 	if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4017 		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4018 		sctp_m_freem(m);
4019 		return (EFAULT);
4020 	}
4021 #if defined(INET) || defined(INET6)
4022 	if (stcb) {
4023 		vrf_id = stcb->asoc.vrf_id;
4024 	} else {
4025 		vrf_id = inp->def_vrf_id;
4026 	}
4027 #endif
4028 	/* fill in the HMAC digest for any AUTH chunk in the packet */
4029 	if ((auth != NULL) && (stcb != NULL)) {
4030 		sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4031 	}
4032 	if (net) {
4033 		tos_value = net->dscp;
4034 	} else if (stcb) {
4035 		tos_value = stcb->asoc.default_dscp;
4036 	} else {
4037 		tos_value = inp->sctp_ep.default_dscp;
4038 	}
4039 
4040 	switch (to->sa_family) {
4041 #ifdef INET
4042 	case AF_INET:
4043 		{
4044 			struct ip *ip = NULL;
4045 			sctp_route_t iproute;
4046 			int len;
4047 
4048 			len = SCTP_MIN_V4_OVERHEAD;
4049 			if (port) {
4050 				len += sizeof(struct udphdr);
4051 			}
4052 			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4053 			if (newm == NULL) {
4054 				sctp_m_freem(m);
4055 				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4056 				return (ENOMEM);
4057 			}
4058 			SCTP_ALIGN_TO_END(newm, len);
4059 			SCTP_BUF_LEN(newm) = len;
4060 			SCTP_BUF_NEXT(newm) = m;
4061 			m = newm;
4062 			if (net != NULL) {
4063 				m->m_pkthdr.flowid = net->flowid;
4064 				M_HASHTYPE_SET(m, net->flowtype);
4065 			} else {
4066 				m->m_pkthdr.flowid = mflowid;
4067 				M_HASHTYPE_SET(m, mflowtype);
4068 			}
4069 			packet_length = sctp_calculate_len(m);
4070 			ip = mtod(m, struct ip *);
4071 			ip->ip_v = IPVERSION;
4072 			ip->ip_hl = (sizeof(struct ip) >> 2);
4073 			if (tos_value == 0) {
4074 				/*
4075 				 * This means especially, that it is not set
4076 				 * at the SCTP layer. So use the value from
4077 				 * the IP layer.
4078 				 */
4079 				tos_value = inp->ip_inp.inp.inp_ip_tos;
4080 			}
4081 			tos_value &= 0xfc;
4082 			if (ecn_ok) {
4083 				tos_value |= sctp_get_ect(stcb);
4084 			}
4085 			if ((nofragment_flag) && (port == 0)) {
4086 				ip->ip_off = htons(IP_DF);
4087 			} else {
4088 				ip->ip_off = htons(0);
4089 			}
4090 			/* FreeBSD has a function for ip_id's */
4091 			ip_fillid(ip);
4092 
4093 			ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4094 			ip->ip_len = htons(packet_length);
4095 			ip->ip_tos = tos_value;
4096 			if (port) {
4097 				ip->ip_p = IPPROTO_UDP;
4098 			} else {
4099 				ip->ip_p = IPPROTO_SCTP;
4100 			}
4101 			ip->ip_sum = 0;
4102 			if (net == NULL) {
4103 				ro = &iproute;
4104 				memset(&iproute, 0, sizeof(iproute));
4105 				memcpy(&ro->ro_dst, to, to->sa_len);
4106 			} else {
4107 				ro = (sctp_route_t *)&net->ro;
4108 			}
4109 			/* Now the address selection part */
4110 			ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4111 
4112 			/* call the routine to select the src address */
4113 			if (net && out_of_asoc_ok == 0) {
4114 				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4115 					sctp_free_ifa(net->ro._s_addr);
4116 					net->ro._s_addr = NULL;
4117 					net->src_addr_selected = 0;
4118 					if (ro->ro_rt) {
4119 						RTFREE(ro->ro_rt);
4120 						ro->ro_rt = NULL;
4121 					}
4122 				}
4123 				if (net->src_addr_selected == 0) {
4124 					/* Cache the source address */
4125 					net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4126 					    ro, net, 0,
4127 					    vrf_id);
4128 					net->src_addr_selected = 1;
4129 				}
4130 				if (net->ro._s_addr == NULL) {
4131 					/* No route to host */
4132 					net->src_addr_selected = 0;
4133 					sctp_handle_no_route(stcb, net, so_locked);
4134 					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4135 					sctp_m_freem(m);
4136 					return (EHOSTUNREACH);
4137 				}
4138 				ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4139 			} else {
4140 				if (over_addr == NULL) {
4141 					struct sctp_ifa *_lsrc;
4142 
4143 					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4144 					    net,
4145 					    out_of_asoc_ok,
4146 					    vrf_id);
4147 					if (_lsrc == NULL) {
4148 						sctp_handle_no_route(stcb, net, so_locked);
4149 						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4150 						sctp_m_freem(m);
4151 						return (EHOSTUNREACH);
4152 					}
4153 					ip->ip_src = _lsrc->address.sin.sin_addr;
4154 					sctp_free_ifa(_lsrc);
4155 				} else {
4156 					ip->ip_src = over_addr->sin.sin_addr;
4157 					SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4158 				}
4159 			}
4160 			if (port) {
4161 				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4162 					sctp_handle_no_route(stcb, net, so_locked);
4163 					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4164 					sctp_m_freem(m);
4165 					return (EHOSTUNREACH);
4166 				}
4167 				udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4168 				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4169 				udp->uh_dport = port;
4170 				udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
4171 				if (V_udp_cksum) {
4172 					udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4173 				} else {
4174 					udp->uh_sum = 0;
4175 				}
4176 				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4177 			} else {
4178 				sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4179 			}
4180 
4181 			sctphdr->src_port = src_port;
4182 			sctphdr->dest_port = dest_port;
4183 			sctphdr->v_tag = v_tag;
4184 			sctphdr->checksum = 0;
4185 
4186 			/*
4187 			 * If source address selection fails and we find no
4188 			 * route then the ip_output should fail as well with
4189 			 * a NO_ROUTE_TO_HOST type error. We probably should
4190 			 * catch that somewhere and abort the association
4191 			 * right away (assuming this is an INIT being sent).
4192 			 */
4193 			if (ro->ro_rt == NULL) {
4194 				/*
4195 				 * src addr selection failed to find a route
4196 				 * (or valid source addr), so we can't get
4197 				 * there from here (yet)!
4198 				 */
4199 				sctp_handle_no_route(stcb, net, so_locked);
4200 				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4201 				sctp_m_freem(m);
4202 				return (EHOSTUNREACH);
4203 			}
4204 			if (ro != &iproute) {
4205 				memcpy(&iproute, ro, sizeof(*ro));
4206 			}
4207 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4208 			    (uint32_t)(ntohl(ip->ip_src.s_addr)));
4209 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4210 			    (uint32_t)(ntohl(ip->ip_dst.s_addr)));
4211 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4212 			    (void *)ro->ro_rt);
4213 
4214 			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4215 				/* failed to prepend data, give up */
4216 				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4217 				sctp_m_freem(m);
4218 				return (ENOMEM);
4219 			}
4220 			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4221 			if (port) {
4222 #if defined(SCTP_WITH_NO_CSUM)
4223 				SCTP_STAT_INCR(sctps_sendnocrc);
4224 #else
4225 				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4226 				SCTP_STAT_INCR(sctps_sendswcrc);
4227 #endif
4228 				if (V_udp_cksum) {
4229 					SCTP_ENABLE_UDP_CSUM(o_pak);
4230 				}
4231 			} else {
4232 #if defined(SCTP_WITH_NO_CSUM)
4233 				SCTP_STAT_INCR(sctps_sendnocrc);
4234 #else
4235 				m->m_pkthdr.csum_flags = CSUM_SCTP;
4236 				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4237 				SCTP_STAT_INCR(sctps_sendhwcrc);
4238 #endif
4239 			}
4240 #ifdef SCTP_PACKET_LOGGING
4241 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4242 				sctp_packet_log(o_pak);
4243 #endif
4244 			/* send it out.  table id is taken from stcb */
4245 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4246 			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4247 				so = SCTP_INP_SO(inp);
4248 				SCTP_SOCKET_UNLOCK(so, 0);
4249 			}
4250 #endif
4251 			SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4252 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4253 			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4254 				atomic_add_int(&stcb->asoc.refcnt, 1);
4255 				SCTP_TCB_UNLOCK(stcb);
4256 				SCTP_SOCKET_LOCK(so, 0);
4257 				SCTP_TCB_LOCK(stcb);
4258 				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4259 			}
4260 #endif
4261 			SCTP_STAT_INCR(sctps_sendpackets);
4262 			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4263 			if (ret)
4264 				SCTP_STAT_INCR(sctps_senderrors);
4265 
4266 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4267 			if (net == NULL) {
4268 				/* free tempy routes */
4269 				RO_RTFREE(ro);
4270 			} else {
4271 				/*
4272 				 * PMTU check versus smallest asoc MTU goes
4273 				 * here
4274 				 */
4275 				if ((ro->ro_rt != NULL) &&
4276 				    (net->ro._s_addr)) {
4277 					uint32_t mtu;
4278 
4279 					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4280 					if (net->port) {
4281 						mtu -= sizeof(struct udphdr);
4282 					}
4283 					if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4284 						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4285 						net->mtu = mtu;
4286 					}
4287 				} else if (ro->ro_rt == NULL) {
4288 					/* route was freed */
4289 					if (net->ro._s_addr &&
4290 					    net->src_addr_selected) {
4291 						sctp_free_ifa(net->ro._s_addr);
4292 						net->ro._s_addr = NULL;
4293 					}
4294 					net->src_addr_selected = 0;
4295 				}
4296 			}
4297 			return (ret);
4298 		}
4299 #endif
4300 #ifdef INET6
4301 	case AF_INET6:
4302 		{
4303 			uint32_t flowlabel, flowinfo;
4304 			struct ip6_hdr *ip6h;
4305 			struct route_in6 ip6route;
4306 			struct ifnet *ifp;
4307 			struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4308 			int prev_scope = 0;
4309 			struct sockaddr_in6 lsa6_storage;
4310 			int error;
4311 			u_short prev_port = 0;
4312 			int len;
4313 
4314 			if (net) {
4315 				flowlabel = net->flowlabel;
4316 			} else if (stcb) {
4317 				flowlabel = stcb->asoc.default_flowlabel;
4318 			} else {
4319 				flowlabel = inp->sctp_ep.default_flowlabel;
4320 			}
4321 			if (flowlabel == 0) {
4322 				/*
4323 				 * This means especially, that it is not set
4324 				 * at the SCTP layer. So use the value from
4325 				 * the IP layer.
4326 				 */
4327 				flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4328 			}
4329 			flowlabel &= 0x000fffff;
4330 			len = SCTP_MIN_OVERHEAD;
4331 			if (port) {
4332 				len += sizeof(struct udphdr);
4333 			}
4334 			newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
4335 			if (newm == NULL) {
4336 				sctp_m_freem(m);
4337 				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4338 				return (ENOMEM);
4339 			}
4340 			SCTP_ALIGN_TO_END(newm, len);
4341 			SCTP_BUF_LEN(newm) = len;
4342 			SCTP_BUF_NEXT(newm) = m;
4343 			m = newm;
4344 			if (net != NULL) {
4345 				m->m_pkthdr.flowid = net->flowid;
4346 				M_HASHTYPE_SET(m, net->flowtype);
4347 			} else {
4348 				m->m_pkthdr.flowid = mflowid;
4349 				M_HASHTYPE_SET(m, mflowtype);
4350 			}
4351 			packet_length = sctp_calculate_len(m);
4352 
4353 			ip6h = mtod(m, struct ip6_hdr *);
4354 			/* protect *sin6 from overwrite */
4355 			sin6 = (struct sockaddr_in6 *)to;
4356 			tmp = *sin6;
4357 			sin6 = &tmp;
4358 
4359 			/* KAME hack: embed scopeid */
4360 			if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4361 				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4362 				return (EINVAL);
4363 			}
4364 			if (net == NULL) {
4365 				memset(&ip6route, 0, sizeof(ip6route));
4366 				ro = (sctp_route_t *)&ip6route;
4367 				memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4368 			} else {
4369 				ro = (sctp_route_t *)&net->ro;
4370 			}
4371 			/*
4372 			 * We assume here that inp_flow is in host byte
4373 			 * order within the TCB!
4374 			 */
4375 			if (tos_value == 0) {
4376 				/*
4377 				 * This means especially, that it is not set
4378 				 * at the SCTP layer. So use the value from
4379 				 * the IP layer.
4380 				 */
4381 				tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4382 			}
4383 			tos_value &= 0xfc;
4384 			if (ecn_ok) {
4385 				tos_value |= sctp_get_ect(stcb);
4386 			}
4387 			flowinfo = 0x06;
4388 			flowinfo <<= 8;
4389 			flowinfo |= tos_value;
4390 			flowinfo <<= 20;
4391 			flowinfo |= flowlabel;
4392 			ip6h->ip6_flow = htonl(flowinfo);
4393 			if (port) {
4394 				ip6h->ip6_nxt = IPPROTO_UDP;
4395 			} else {
4396 				ip6h->ip6_nxt = IPPROTO_SCTP;
4397 			}
4398 			ip6h->ip6_plen = (uint16_t)(packet_length - sizeof(struct ip6_hdr));
4399 			ip6h->ip6_dst = sin6->sin6_addr;
4400 
4401 			/*
4402 			 * Add SRC address selection here: we can only reuse
4403 			 * to a limited degree the kame src-addr-sel, since
4404 			 * we can try their selection but it may not be
4405 			 * bound.
4406 			 */
4407 			bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4408 			lsa6_tmp.sin6_family = AF_INET6;
4409 			lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4410 			lsa6 = &lsa6_tmp;
4411 			if (net && out_of_asoc_ok == 0) {
4412 				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4413 					sctp_free_ifa(net->ro._s_addr);
4414 					net->ro._s_addr = NULL;
4415 					net->src_addr_selected = 0;
4416 					if (ro->ro_rt) {
4417 						RTFREE(ro->ro_rt);
4418 						ro->ro_rt = NULL;
4419 					}
4420 				}
4421 				if (net->src_addr_selected == 0) {
4422 					sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4423 					/* KAME hack: embed scopeid */
4424 					if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4425 						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4426 						return (EINVAL);
4427 					}
4428 					/* Cache the source address */
4429 					net->ro._s_addr = sctp_source_address_selection(inp,
4430 					    stcb,
4431 					    ro,
4432 					    net,
4433 					    0,
4434 					    vrf_id);
4435 					(void)sa6_recoverscope(sin6);
4436 					net->src_addr_selected = 1;
4437 				}
4438 				if (net->ro._s_addr == NULL) {
4439 					SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4440 					net->src_addr_selected = 0;
4441 					sctp_handle_no_route(stcb, net, so_locked);
4442 					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4443 					sctp_m_freem(m);
4444 					return (EHOSTUNREACH);
4445 				}
4446 				lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4447 			} else {
4448 				sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4449 				/* KAME hack: embed scopeid */
4450 				if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4451 					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4452 					return (EINVAL);
4453 				}
4454 				if (over_addr == NULL) {
4455 					struct sctp_ifa *_lsrc;
4456 
4457 					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4458 					    net,
4459 					    out_of_asoc_ok,
4460 					    vrf_id);
4461 					if (_lsrc == NULL) {
4462 						sctp_handle_no_route(stcb, net, so_locked);
4463 						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4464 						sctp_m_freem(m);
4465 						return (EHOSTUNREACH);
4466 					}
4467 					lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4468 					sctp_free_ifa(_lsrc);
4469 				} else {
4470 					lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4471 					SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
4472 				}
4473 				(void)sa6_recoverscope(sin6);
4474 			}
4475 			lsa6->sin6_port = inp->sctp_lport;
4476 
4477 			if (ro->ro_rt == NULL) {
4478 				/*
4479 				 * src addr selection failed to find a route
4480 				 * (or valid source addr), so we can't get
4481 				 * there from here!
4482 				 */
4483 				sctp_handle_no_route(stcb, net, so_locked);
4484 				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4485 				sctp_m_freem(m);
4486 				return (EHOSTUNREACH);
4487 			}
4488 			/*
4489 			 * XXX: sa6 may not have a valid sin6_scope_id in
4490 			 * the non-SCOPEDROUTING case.
4491 			 */
4492 			bzero(&lsa6_storage, sizeof(lsa6_storage));
4493 			lsa6_storage.sin6_family = AF_INET6;
4494 			lsa6_storage.sin6_len = sizeof(lsa6_storage);
4495 			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4496 			if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4497 				SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4498 				sctp_m_freem(m);
4499 				return (error);
4500 			}
4501 			/* XXX */
4502 			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4503 			lsa6_storage.sin6_port = inp->sctp_lport;
4504 			lsa6 = &lsa6_storage;
4505 			ip6h->ip6_src = lsa6->sin6_addr;
4506 
4507 			if (port) {
4508 				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4509 					sctp_handle_no_route(stcb, net, so_locked);
4510 					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4511 					sctp_m_freem(m);
4512 					return (EHOSTUNREACH);
4513 				}
4514 				udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4515 				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4516 				udp->uh_dport = port;
4517 				udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
4518 				udp->uh_sum = 0;
4519 				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4520 			} else {
4521 				sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4522 			}
4523 
4524 			sctphdr->src_port = src_port;
4525 			sctphdr->dest_port = dest_port;
4526 			sctphdr->v_tag = v_tag;
4527 			sctphdr->checksum = 0;
4528 
4529 			/*
4530 			 * We set the hop limit now since there is a good
4531 			 * chance that our ro pointer is now filled
4532 			 */
4533 			ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4534 			ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4535 
4536 #ifdef SCTP_DEBUG
4537 			/* Copy to be sure something bad is not happening */
4538 			sin6->sin6_addr = ip6h->ip6_dst;
4539 			lsa6->sin6_addr = ip6h->ip6_src;
4540 #endif
4541 
4542 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4543 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4544 			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4545 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4546 			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4547 			if (net) {
4548 				sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4549 				/*
4550 				 * preserve the port and scope for link
4551 				 * local send
4552 				 */
4553 				prev_scope = sin6->sin6_scope_id;
4554 				prev_port = sin6->sin6_port;
4555 			}
4556 			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4557 				/* failed to prepend data, give up */
4558 				sctp_m_freem(m);
4559 				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4560 				return (ENOMEM);
4561 			}
4562 			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4563 			if (port) {
4564 #if defined(SCTP_WITH_NO_CSUM)
4565 				SCTP_STAT_INCR(sctps_sendnocrc);
4566 #else
4567 				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4568 				SCTP_STAT_INCR(sctps_sendswcrc);
4569 #endif
4570 				if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4571 					udp->uh_sum = 0xffff;
4572 				}
4573 			} else {
4574 #if defined(SCTP_WITH_NO_CSUM)
4575 				SCTP_STAT_INCR(sctps_sendnocrc);
4576 #else
4577 				m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4578 				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4579 				SCTP_STAT_INCR(sctps_sendhwcrc);
4580 #endif
4581 			}
4582 			/* send it out. table id is taken from stcb */
4583 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4584 			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4585 				so = SCTP_INP_SO(inp);
4586 				SCTP_SOCKET_UNLOCK(so, 0);
4587 			}
4588 #endif
4589 #ifdef SCTP_PACKET_LOGGING
4590 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4591 				sctp_packet_log(o_pak);
4592 #endif
4593 			SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4594 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4595 			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4596 				atomic_add_int(&stcb->asoc.refcnt, 1);
4597 				SCTP_TCB_UNLOCK(stcb);
4598 				SCTP_SOCKET_LOCK(so, 0);
4599 				SCTP_TCB_LOCK(stcb);
4600 				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4601 			}
4602 #endif
4603 			if (net) {
4604 				/* for link local this must be done */
4605 				sin6->sin6_scope_id = prev_scope;
4606 				sin6->sin6_port = prev_port;
4607 			}
4608 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4609 			SCTP_STAT_INCR(sctps_sendpackets);
4610 			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4611 			if (ret) {
4612 				SCTP_STAT_INCR(sctps_senderrors);
4613 			}
4614 			if (net == NULL) {
4615 				/* Now if we had a temp route free it */
4616 				RO_RTFREE(ro);
4617 			} else {
4618 				/*
4619 				 * PMTU check versus smallest asoc MTU goes
4620 				 * here
4621 				 */
4622 				if (ro->ro_rt == NULL) {
4623 					/* Route was freed */
4624 					if (net->ro._s_addr &&
4625 					    net->src_addr_selected) {
4626 						sctp_free_ifa(net->ro._s_addr);
4627 						net->ro._s_addr = NULL;
4628 					}
4629 					net->src_addr_selected = 0;
4630 				}
4631 				if ((ro->ro_rt != NULL) &&
4632 				    (net->ro._s_addr)) {
4633 					uint32_t mtu;
4634 
4635 					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4636 					if (mtu &&
4637 					    (stcb->asoc.smallest_mtu > mtu)) {
4638 						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4639 						net->mtu = mtu;
4640 						if (net->port) {
4641 							net->mtu -= sizeof(struct udphdr);
4642 						}
4643 					}
4644 				} else if (ifp) {
4645 					if (ND_IFINFO(ifp)->linkmtu &&
4646 					    (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4647 						sctp_mtu_size_reset(inp,
4648 						    &stcb->asoc,
4649 						    ND_IFINFO(ifp)->linkmtu);
4650 					}
4651 				}
4652 			}
4653 			return (ret);
4654 		}
4655 #endif
4656 	default:
4657 		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4658 		    ((struct sockaddr *)to)->sa_family);
4659 		sctp_m_freem(m);
4660 		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4661 		return (EFAULT);
4662 	}
4663 }
4664 
4665 
4666 void
4667 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4668 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4669     SCTP_UNUSED
4670 #endif
4671 )
4672 {
4673 	struct mbuf *m, *m_last;
4674 	struct sctp_nets *net;
4675 	struct sctp_init_chunk *init;
4676 	struct sctp_supported_addr_param *sup_addr;
4677 	struct sctp_adaptation_layer_indication *ali;
4678 	struct sctp_supported_chunk_types_param *pr_supported;
4679 	struct sctp_paramhdr *ph;
4680 	int cnt_inits_to = 0;
4681 	int error;
4682 	uint16_t num_ext, chunk_len, padding_len, parameter_len;
4683 
4684 	/* INIT's always go to the primary (and usually ONLY address) */
4685 	net = stcb->asoc.primary_destination;
4686 	if (net == NULL) {
4687 		net = TAILQ_FIRST(&stcb->asoc.nets);
4688 		if (net == NULL) {
4689 			/* TSNH */
4690 			return;
4691 		}
4692 		/* we confirm any address we send an INIT to */
4693 		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4694 		(void)sctp_set_primary_addr(stcb, NULL, net);
4695 	} else {
4696 		/* we confirm any address we send an INIT to */
4697 		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4698 	}
4699 	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4700 #ifdef INET6
4701 	if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4702 		/*
4703 		 * special hook, if we are sending to link local it will not
4704 		 * show up in our private address count.
4705 		 */
4706 		if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4707 			cnt_inits_to = 1;
4708 	}
4709 #endif
4710 	if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4711 		/* This case should not happen */
4712 		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4713 		return;
4714 	}
4715 	/* start the INIT timer */
4716 	sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4717 
4718 	m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
4719 	if (m == NULL) {
4720 		/* No memory, INIT timer will re-attempt. */
4721 		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4722 		return;
4723 	}
4724 	chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
4725 	padding_len = 0;
4726 	/* Now lets put the chunk header in place */
4727 	init = mtod(m, struct sctp_init_chunk *);
4728 	/* now the chunk header */
4729 	init->ch.chunk_type = SCTP_INITIATION;
4730 	init->ch.chunk_flags = 0;
4731 	/* fill in later from mbuf we build */
4732 	init->ch.chunk_length = 0;
4733 	/* place in my tag */
4734 	init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4735 	/* set up some of the credits. */
4736 	init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4737 	    SCTP_MINIMAL_RWND));
4738 	init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4739 	init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4740 	init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4741 
4742 	/* Adaptation layer indication parameter */
4743 	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4744 		parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
4745 		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4746 		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4747 		ali->ph.param_length = htons(parameter_len);
4748 		ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
4749 		chunk_len += parameter_len;
4750 	}
4751 	/* ECN parameter */
4752 	if (stcb->asoc.ecn_supported == 1) {
4753 		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4754 		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4755 		ph->param_type = htons(SCTP_ECN_CAPABLE);
4756 		ph->param_length = htons(parameter_len);
4757 		chunk_len += parameter_len;
4758 	}
4759 	/* PR-SCTP supported parameter */
4760 	if (stcb->asoc.prsctp_supported == 1) {
4761 		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4762 		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4763 		ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4764 		ph->param_length = htons(parameter_len);
4765 		chunk_len += parameter_len;
4766 	}
4767 	/* Add NAT friendly parameter. */
4768 	if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
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_HAS_NAT_SUPPORT);
4772 		ph->param_length = htons(parameter_len);
4773 		chunk_len += parameter_len;
4774 	}
4775 	/* And now tell the peer which extensions we support */
4776 	num_ext = 0;
4777 	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4778 	if (stcb->asoc.prsctp_supported == 1) {
4779 		pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4780 		if (stcb->asoc.idata_supported) {
4781 			pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
4782 		}
4783 	}
4784 	if (stcb->asoc.auth_supported == 1) {
4785 		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4786 	}
4787 	if (stcb->asoc.asconf_supported == 1) {
4788 		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4789 		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4790 	}
4791 	if (stcb->asoc.reconfig_supported == 1) {
4792 		pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4793 	}
4794 	if (stcb->asoc.idata_supported) {
4795 		pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
4796 	}
4797 	if (stcb->asoc.nrsack_supported == 1) {
4798 		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4799 	}
4800 	if (stcb->asoc.pktdrop_supported == 1) {
4801 		pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4802 	}
4803 	if (num_ext > 0) {
4804 		parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4805 		pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4806 		pr_supported->ph.param_length = htons(parameter_len);
4807 		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4808 		chunk_len += parameter_len;
4809 	}
4810 	/* add authentication parameters */
4811 	if (stcb->asoc.auth_supported) {
4812 		/* attach RANDOM parameter, if available */
4813 		if (stcb->asoc.authinfo.random != NULL) {
4814 			struct sctp_auth_random *randp;
4815 
4816 			if (padding_len > 0) {
4817 				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4818 				chunk_len += padding_len;
4819 				padding_len = 0;
4820 			}
4821 			randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4822 			parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4823 			/* random key already contains the header */
4824 			memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4825 			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4826 			chunk_len += parameter_len;
4827 		}
4828 		/* add HMAC_ALGO parameter */
4829 		if (stcb->asoc.local_hmacs != NULL) {
4830 			struct sctp_auth_hmac_algo *hmacs;
4831 
4832 			if (padding_len > 0) {
4833 				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4834 				chunk_len += padding_len;
4835 				padding_len = 0;
4836 			}
4837 			hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4838 			parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
4839 			    stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4840 			hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4841 			hmacs->ph.param_length = htons(parameter_len);
4842 			sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
4843 			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4844 			chunk_len += parameter_len;
4845 		}
4846 		/* add CHUNKS parameter */
4847 		if (stcb->asoc.local_auth_chunks != NULL) {
4848 			struct sctp_auth_chunk_list *chunks;
4849 
4850 			if (padding_len > 0) {
4851 				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4852 				chunk_len += padding_len;
4853 				padding_len = 0;
4854 			}
4855 			chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4856 			parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
4857 			    sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4858 			chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4859 			chunks->ph.param_length = htons(parameter_len);
4860 			sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4861 			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4862 			chunk_len += parameter_len;
4863 		}
4864 	}
4865 	/* now any cookie time extensions */
4866 	if (stcb->asoc.cookie_preserve_req) {
4867 		struct sctp_cookie_perserve_param *cookie_preserve;
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 		parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
4875 		cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4876 		cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4877 		cookie_preserve->ph.param_length = htons(parameter_len);
4878 		cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4879 		stcb->asoc.cookie_preserve_req = 0;
4880 		chunk_len += parameter_len;
4881 	}
4882 	if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4883 		uint8_t i;
4884 
4885 		if (padding_len > 0) {
4886 			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4887 			chunk_len += padding_len;
4888 			padding_len = 0;
4889 		}
4890 		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
4891 		if (stcb->asoc.scope.ipv4_addr_legal) {
4892 			parameter_len += (uint16_t)sizeof(uint16_t);
4893 		}
4894 		if (stcb->asoc.scope.ipv6_addr_legal) {
4895 			parameter_len += (uint16_t)sizeof(uint16_t);
4896 		}
4897 		sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4898 		sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4899 		sup_addr->ph.param_length = htons(parameter_len);
4900 		i = 0;
4901 		if (stcb->asoc.scope.ipv4_addr_legal) {
4902 			sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4903 		}
4904 		if (stcb->asoc.scope.ipv6_addr_legal) {
4905 			sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4906 		}
4907 		padding_len = 4 - 2 * i;
4908 		chunk_len += parameter_len;
4909 	}
4910 	SCTP_BUF_LEN(m) = chunk_len;
4911 	/* now the addresses */
4912 	/*
4913 	 * To optimize this we could put the scoping stuff into a structure
4914 	 * and remove the individual uint8's from the assoc structure. Then
4915 	 * we could just sifa in the address within the stcb. But for now
4916 	 * this is a quick hack to get the address stuff teased apart.
4917 	 */
4918 	m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
4919 	    m, cnt_inits_to,
4920 	    &padding_len, &chunk_len);
4921 
4922 	init->ch.chunk_length = htons(chunk_len);
4923 	if (padding_len > 0) {
4924 		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
4925 			sctp_m_freem(m);
4926 			return;
4927 		}
4928 	}
4929 	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4930 	if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
4931 	    (struct sockaddr *)&net->ro._l_addr,
4932 	    m, 0, NULL, 0, 0, 0, 0,
4933 	    inp->sctp_lport, stcb->rport, htonl(0),
4934 	    net->port, NULL,
4935 	    0, 0,
4936 	    so_locked))) {
4937 		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
4938 		if (error == ENOBUFS) {
4939 			stcb->asoc.ifp_had_enobuf = 1;
4940 			SCTP_STAT_INCR(sctps_lowlevelerr);
4941 		}
4942 	} else {
4943 		stcb->asoc.ifp_had_enobuf = 0;
4944 	}
4945 	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4946 	(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4947 }
4948 
4949 struct mbuf *
4950 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4951     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4952 {
4953 	/*
4954 	 * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4955 	 * being equal to the beginning of the params i.e. (iphlen +
4956 	 * sizeof(struct sctp_init_msg) parse through the parameters to the
4957 	 * end of the mbuf verifying that all parameters are known.
4958 	 *
4959 	 * For unknown parameters build and return a mbuf with
4960 	 * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4961 	 * processing this chunk stop, and set *abort_processing to 1.
4962 	 *
4963 	 * By having param_offset be pre-set to where parameters begin it is
4964 	 * hoped that this routine may be reused in the future by new
4965 	 * features.
4966 	 */
4967 	struct sctp_paramhdr *phdr, params;
4968 
4969 	struct mbuf *mat, *op_err;
4970 	char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4971 	int at, limit, pad_needed;
4972 	uint16_t ptype, plen, padded_size;
4973 	int err_at;
4974 
4975 	*abort_processing = 0;
4976 	mat = in_initpkt;
4977 	err_at = 0;
4978 	limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4979 	at = param_offset;
4980 	op_err = NULL;
4981 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4982 	phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4983 	while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4984 		ptype = ntohs(phdr->param_type);
4985 		plen = ntohs(phdr->param_length);
4986 		if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4987 			/* wacked parameter */
4988 			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4989 			goto invalid_size;
4990 		}
4991 		limit -= SCTP_SIZE32(plen);
4992 		/*-
4993 		 * All parameters for all chunks that we know/understand are
4994 		 * listed here. We process them other places and make
4995 		 * appropriate stop actions per the upper bits. However this
4996 		 * is the generic routine processor's can call to get back
4997 		 * an operr.. to either incorporate (init-ack) or send.
4998 		 */
4999 		padded_size = SCTP_SIZE32(plen);
5000 		switch (ptype) {
5001 			/* Param's with variable size */
5002 		case SCTP_HEARTBEAT_INFO:
5003 		case SCTP_STATE_COOKIE:
5004 		case SCTP_UNRECOG_PARAM:
5005 		case SCTP_ERROR_CAUSE_IND:
5006 			/* ok skip fwd */
5007 			at += padded_size;
5008 			break;
5009 			/* Param's with variable size within a range */
5010 		case SCTP_CHUNK_LIST:
5011 		case SCTP_SUPPORTED_CHUNK_EXT:
5012 			if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5013 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5014 				goto invalid_size;
5015 			}
5016 			at += padded_size;
5017 			break;
5018 		case SCTP_SUPPORTED_ADDRTYPE:
5019 			if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5020 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5021 				goto invalid_size;
5022 			}
5023 			at += padded_size;
5024 			break;
5025 		case SCTP_RANDOM:
5026 			if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5027 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5028 				goto invalid_size;
5029 			}
5030 			at += padded_size;
5031 			break;
5032 		case SCTP_SET_PRIM_ADDR:
5033 		case SCTP_DEL_IP_ADDRESS:
5034 		case SCTP_ADD_IP_ADDRESS:
5035 			if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5036 			    (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5037 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5038 				goto invalid_size;
5039 			}
5040 			at += padded_size;
5041 			break;
5042 			/* Param's with a fixed size */
5043 		case SCTP_IPV4_ADDRESS:
5044 			if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5045 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5046 				goto invalid_size;
5047 			}
5048 			at += padded_size;
5049 			break;
5050 		case SCTP_IPV6_ADDRESS:
5051 			if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5052 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5053 				goto invalid_size;
5054 			}
5055 			at += padded_size;
5056 			break;
5057 		case SCTP_COOKIE_PRESERVE:
5058 			if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5059 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5060 				goto invalid_size;
5061 			}
5062 			at += padded_size;
5063 			break;
5064 		case SCTP_HAS_NAT_SUPPORT:
5065 			*nat_friendly = 1;
5066 			/* fall through */
5067 		case SCTP_PRSCTP_SUPPORTED:
5068 			if (padded_size != sizeof(struct sctp_paramhdr)) {
5069 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5070 				goto invalid_size;
5071 			}
5072 			at += padded_size;
5073 			break;
5074 		case SCTP_ECN_CAPABLE:
5075 			if (padded_size != sizeof(struct sctp_paramhdr)) {
5076 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5077 				goto invalid_size;
5078 			}
5079 			at += padded_size;
5080 			break;
5081 		case SCTP_ULP_ADAPTATION:
5082 			if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5083 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5084 				goto invalid_size;
5085 			}
5086 			at += padded_size;
5087 			break;
5088 		case SCTP_SUCCESS_REPORT:
5089 			if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5090 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5091 				goto invalid_size;
5092 			}
5093 			at += padded_size;
5094 			break;
5095 		case SCTP_HOSTNAME_ADDRESS:
5096 			{
5097 				/* We can NOT handle HOST NAME addresses!! */
5098 				int l_len;
5099 
5100 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5101 				*abort_processing = 1;
5102 				if (op_err == NULL) {
5103 					/* Ok need to try to get a mbuf */
5104 #ifdef INET6
5105 					l_len = SCTP_MIN_OVERHEAD;
5106 #else
5107 					l_len = SCTP_MIN_V4_OVERHEAD;
5108 #endif
5109 					l_len += sizeof(struct sctp_chunkhdr);
5110 					l_len += plen;
5111 					l_len += sizeof(struct sctp_paramhdr);
5112 					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5113 					if (op_err) {
5114 						SCTP_BUF_LEN(op_err) = 0;
5115 						/*
5116 						 * pre-reserve space for ip
5117 						 * and sctp header  and
5118 						 * chunk hdr
5119 						 */
5120 #ifdef INET6
5121 						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5122 #else
5123 						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5124 #endif
5125 						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5126 						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5127 					}
5128 				}
5129 				if (op_err) {
5130 					/* If we have space */
5131 					struct sctp_paramhdr s;
5132 
5133 					if (err_at % 4) {
5134 						uint32_t cpthis = 0;
5135 
5136 						pad_needed = 4 - (err_at % 4);
5137 						m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5138 						err_at += pad_needed;
5139 					}
5140 					s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5141 					s.param_length = htons(sizeof(s) + plen);
5142 					m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5143 					err_at += sizeof(s);
5144 					phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5145 					if (phdr == NULL) {
5146 						sctp_m_freem(op_err);
5147 						/*
5148 						 * we are out of memory but
5149 						 * we still need to have a
5150 						 * look at what to do (the
5151 						 * system is in trouble
5152 						 * though).
5153 						 */
5154 						return (NULL);
5155 					}
5156 					m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5157 				}
5158 				return (op_err);
5159 				break;
5160 			}
5161 		default:
5162 			/*
5163 			 * we do not recognize the parameter figure out what
5164 			 * we do.
5165 			 */
5166 			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5167 			if ((ptype & 0x4000) == 0x4000) {
5168 				/* Report bit is set?? */
5169 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5170 				if (op_err == NULL) {
5171 					int l_len;
5172 
5173 					/* Ok need to try to get an mbuf */
5174 #ifdef INET6
5175 					l_len = SCTP_MIN_OVERHEAD;
5176 #else
5177 					l_len = SCTP_MIN_V4_OVERHEAD;
5178 #endif
5179 					l_len += sizeof(struct sctp_chunkhdr);
5180 					l_len += plen;
5181 					l_len += sizeof(struct sctp_paramhdr);
5182 					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5183 					if (op_err) {
5184 						SCTP_BUF_LEN(op_err) = 0;
5185 #ifdef INET6
5186 						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5187 #else
5188 						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5189 #endif
5190 						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5191 						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5192 					}
5193 				}
5194 				if (op_err) {
5195 					/* If we have space */
5196 					struct sctp_paramhdr s;
5197 
5198 					if (err_at % 4) {
5199 						uint32_t cpthis = 0;
5200 
5201 						pad_needed = 4 - (err_at % 4);
5202 						m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5203 						err_at += pad_needed;
5204 					}
5205 					s.param_type = htons(SCTP_UNRECOG_PARAM);
5206 					s.param_length = htons(sizeof(s) + plen);
5207 					m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5208 					err_at += sizeof(s);
5209 					if (plen > sizeof(tempbuf)) {
5210 						plen = sizeof(tempbuf);
5211 					}
5212 					phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5213 					if (phdr == NULL) {
5214 						sctp_m_freem(op_err);
5215 						/*
5216 						 * we are out of memory but
5217 						 * we still need to have a
5218 						 * look at what to do (the
5219 						 * system is in trouble
5220 						 * though).
5221 						 */
5222 						op_err = NULL;
5223 						goto more_processing;
5224 					}
5225 					m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5226 					err_at += plen;
5227 				}
5228 			}
5229 	more_processing:
5230 			if ((ptype & 0x8000) == 0x0000) {
5231 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5232 				return (op_err);
5233 			} else {
5234 				/* skip this chunk and continue processing */
5235 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5236 				at += SCTP_SIZE32(plen);
5237 			}
5238 			break;
5239 
5240 		}
5241 		phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5242 	}
5243 	return (op_err);
5244 invalid_size:
5245 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5246 	*abort_processing = 1;
5247 	if ((op_err == NULL) && phdr) {
5248 		int l_len;
5249 #ifdef INET6
5250 		l_len = SCTP_MIN_OVERHEAD;
5251 #else
5252 		l_len = SCTP_MIN_V4_OVERHEAD;
5253 #endif
5254 		l_len += sizeof(struct sctp_chunkhdr);
5255 		l_len += (2 * sizeof(struct sctp_paramhdr));
5256 		op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
5257 		if (op_err) {
5258 			SCTP_BUF_LEN(op_err) = 0;
5259 #ifdef INET6
5260 			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5261 #else
5262 			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5263 #endif
5264 			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5265 			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5266 		}
5267 	}
5268 	if ((op_err) && phdr) {
5269 		struct sctp_paramhdr s;
5270 
5271 		if (err_at % 4) {
5272 			uint32_t cpthis = 0;
5273 
5274 			pad_needed = 4 - (err_at % 4);
5275 			m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5276 			err_at += pad_needed;
5277 		}
5278 		s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5279 		s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5280 		m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5281 		err_at += sizeof(s);
5282 		/* Only copy back the p-hdr that caused the issue */
5283 		m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5284 	}
5285 	return (op_err);
5286 }
5287 
5288 static int
5289 sctp_are_there_new_addresses(struct sctp_association *asoc,
5290     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5291 {
5292 	/*
5293 	 * Given a INIT packet, look through the packet to verify that there
5294 	 * are NO new addresses. As we go through the parameters add reports
5295 	 * of any un-understood parameters that require an error.  Also we
5296 	 * must return (1) to drop the packet if we see a un-understood
5297 	 * parameter that tells us to drop the chunk.
5298 	 */
5299 	struct sockaddr *sa_touse;
5300 	struct sockaddr *sa;
5301 	struct sctp_paramhdr *phdr, params;
5302 	uint16_t ptype, plen;
5303 	uint8_t fnd;
5304 	struct sctp_nets *net;
5305 	int check_src;
5306 #ifdef INET
5307 	struct sockaddr_in sin4, *sa4;
5308 #endif
5309 #ifdef INET6
5310 	struct sockaddr_in6 sin6, *sa6;
5311 #endif
5312 
5313 #ifdef INET
5314 	memset(&sin4, 0, sizeof(sin4));
5315 	sin4.sin_family = AF_INET;
5316 	sin4.sin_len = sizeof(sin4);
5317 #endif
5318 #ifdef INET6
5319 	memset(&sin6, 0, sizeof(sin6));
5320 	sin6.sin6_family = AF_INET6;
5321 	sin6.sin6_len = sizeof(sin6);
5322 #endif
5323 	/* First what about the src address of the pkt ? */
5324 	check_src = 0;
5325 	switch (src->sa_family) {
5326 #ifdef INET
5327 	case AF_INET:
5328 		if (asoc->scope.ipv4_addr_legal) {
5329 			check_src = 1;
5330 		}
5331 		break;
5332 #endif
5333 #ifdef INET6
5334 	case AF_INET6:
5335 		if (asoc->scope.ipv6_addr_legal) {
5336 			check_src = 1;
5337 		}
5338 		break;
5339 #endif
5340 	default:
5341 		/* TSNH */
5342 		break;
5343 	}
5344 	if (check_src) {
5345 		fnd = 0;
5346 		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5347 			sa = (struct sockaddr *)&net->ro._l_addr;
5348 			if (sa->sa_family == src->sa_family) {
5349 #ifdef INET
5350 				if (sa->sa_family == AF_INET) {
5351 					struct sockaddr_in *src4;
5352 
5353 					sa4 = (struct sockaddr_in *)sa;
5354 					src4 = (struct sockaddr_in *)src;
5355 					if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5356 						fnd = 1;
5357 						break;
5358 					}
5359 				}
5360 #endif
5361 #ifdef INET6
5362 				if (sa->sa_family == AF_INET6) {
5363 					struct sockaddr_in6 *src6;
5364 
5365 					sa6 = (struct sockaddr_in6 *)sa;
5366 					src6 = (struct sockaddr_in6 *)src;
5367 					if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5368 						fnd = 1;
5369 						break;
5370 					}
5371 				}
5372 #endif
5373 			}
5374 		}
5375 		if (fnd == 0) {
5376 			/* New address added! no need to look further. */
5377 			return (1);
5378 		}
5379 	}
5380 	/* Ok so far lets munge through the rest of the packet */
5381 	offset += sizeof(struct sctp_init_chunk);
5382 	phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5383 	while (phdr) {
5384 		sa_touse = NULL;
5385 		ptype = ntohs(phdr->param_type);
5386 		plen = ntohs(phdr->param_length);
5387 		switch (ptype) {
5388 #ifdef INET
5389 		case SCTP_IPV4_ADDRESS:
5390 			{
5391 				struct sctp_ipv4addr_param *p4, p4_buf;
5392 
5393 				phdr = sctp_get_next_param(in_initpkt, offset,
5394 				    (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5395 				if (plen != sizeof(struct sctp_ipv4addr_param) ||
5396 				    phdr == NULL) {
5397 					return (1);
5398 				}
5399 				if (asoc->scope.ipv4_addr_legal) {
5400 					p4 = (struct sctp_ipv4addr_param *)phdr;
5401 					sin4.sin_addr.s_addr = p4->addr;
5402 					sa_touse = (struct sockaddr *)&sin4;
5403 				}
5404 				break;
5405 			}
5406 #endif
5407 #ifdef INET6
5408 		case SCTP_IPV6_ADDRESS:
5409 			{
5410 				struct sctp_ipv6addr_param *p6, p6_buf;
5411 
5412 				phdr = sctp_get_next_param(in_initpkt, offset,
5413 				    (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5414 				if (plen != sizeof(struct sctp_ipv6addr_param) ||
5415 				    phdr == NULL) {
5416 					return (1);
5417 				}
5418 				if (asoc->scope.ipv6_addr_legal) {
5419 					p6 = (struct sctp_ipv6addr_param *)phdr;
5420 					memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5421 					    sizeof(p6->addr));
5422 					sa_touse = (struct sockaddr *)&sin6;
5423 				}
5424 				break;
5425 			}
5426 #endif
5427 		default:
5428 			sa_touse = NULL;
5429 			break;
5430 		}
5431 		if (sa_touse) {
5432 			/* ok, sa_touse points to one to check */
5433 			fnd = 0;
5434 			TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5435 				sa = (struct sockaddr *)&net->ro._l_addr;
5436 				if (sa->sa_family != sa_touse->sa_family) {
5437 					continue;
5438 				}
5439 #ifdef INET
5440 				if (sa->sa_family == AF_INET) {
5441 					sa4 = (struct sockaddr_in *)sa;
5442 					if (sa4->sin_addr.s_addr ==
5443 					    sin4.sin_addr.s_addr) {
5444 						fnd = 1;
5445 						break;
5446 					}
5447 				}
5448 #endif
5449 #ifdef INET6
5450 				if (sa->sa_family == AF_INET6) {
5451 					sa6 = (struct sockaddr_in6 *)sa;
5452 					if (SCTP6_ARE_ADDR_EQUAL(
5453 					    sa6, &sin6)) {
5454 						fnd = 1;
5455 						break;
5456 					}
5457 				}
5458 #endif
5459 			}
5460 			if (!fnd) {
5461 				/* New addr added! no need to look further */
5462 				return (1);
5463 			}
5464 		}
5465 		offset += SCTP_SIZE32(plen);
5466 		phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5467 	}
5468 	return (0);
5469 }
5470 
5471 /*
5472  * Given a MBUF chain that was sent into us containing an INIT. Build a
5473  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5474  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5475  * message (i.e. the struct sctp_init_msg).
5476  */
5477 void
5478 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5479     struct sctp_nets *src_net, struct mbuf *init_pkt,
5480     int iphlen, int offset,
5481     struct sockaddr *src, struct sockaddr *dst,
5482     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5483     uint8_t mflowtype, uint32_t mflowid,
5484     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5485 {
5486 	struct sctp_association *asoc;
5487 	struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
5488 	struct sctp_init_ack_chunk *initack;
5489 	struct sctp_adaptation_layer_indication *ali;
5490 	struct sctp_supported_chunk_types_param *pr_supported;
5491 	struct sctp_paramhdr *ph;
5492 	union sctp_sockstore *over_addr;
5493 	struct sctp_scoping scp;
5494 #ifdef INET
5495 	struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5496 	struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5497 	struct sockaddr_in *sin;
5498 #endif
5499 #ifdef INET6
5500 	struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5501 	struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5502 	struct sockaddr_in6 *sin6;
5503 #endif
5504 	struct sockaddr *to;
5505 	struct sctp_state_cookie stc;
5506 	struct sctp_nets *net = NULL;
5507 	uint8_t *signature = NULL;
5508 	int cnt_inits_to = 0;
5509 	uint16_t his_limit, i_want;
5510 	int abort_flag;
5511 	int nat_friendly = 0;
5512 	int error;
5513 	struct socket *so;
5514 	uint16_t num_ext, chunk_len, padding_len, parameter_len;
5515 
5516 	if (stcb) {
5517 		asoc = &stcb->asoc;
5518 	} else {
5519 		asoc = NULL;
5520 	}
5521 	if ((asoc != NULL) &&
5522 	    (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
5523 		if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
5524 			/*
5525 			 * new addresses, out of here in non-cookie-wait
5526 			 * states
5527 			 *
5528 			 * Send an ABORT, without the new address error
5529 			 * cause. This looks no different than if no
5530 			 * listener was present.
5531 			 */
5532 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5533 			    "Address added");
5534 			sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5535 			    mflowtype, mflowid, inp->fibnum,
5536 			    vrf_id, port);
5537 			return;
5538 		}
5539 		if (src_net != NULL && (src_net->port != port)) {
5540 			/*
5541 			 * change of remote encapsulation port, out of here
5542 			 * in non-cookie-wait states
5543 			 *
5544 			 * Send an ABORT, without an specific error cause.
5545 			 * This looks no different than if no listener was
5546 			 * present.
5547 			 */
5548 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5549 			    "Remote encapsulation port changed");
5550 			sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5551 			    mflowtype, mflowid, inp->fibnum,
5552 			    vrf_id, port);
5553 			return;
5554 		}
5555 	}
5556 	abort_flag = 0;
5557 	op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5558 	    (offset + sizeof(struct sctp_init_chunk)),
5559 	    &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5560 	if (abort_flag) {
5561 do_a_abort:
5562 		if (op_err == NULL) {
5563 			char msg[SCTP_DIAG_INFO_LEN];
5564 
5565 			snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
5566 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5567 			    msg);
5568 		}
5569 		sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5570 		    init_chk->init.initiate_tag, op_err,
5571 		    mflowtype, mflowid, inp->fibnum,
5572 		    vrf_id, port);
5573 		return;
5574 	}
5575 	m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
5576 	if (m == NULL) {
5577 		/* No memory, INIT timer will re-attempt. */
5578 		if (op_err)
5579 			sctp_m_freem(op_err);
5580 		return;
5581 	}
5582 	chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
5583 	padding_len = 0;
5584 
5585 	/*
5586 	 * We might not overwrite the identification[] completely and on
5587 	 * some platforms time_entered will contain some padding. Therefore
5588 	 * zero out the cookie to avoid putting uninitialized memory on the
5589 	 * wire.
5590 	 */
5591 	memset(&stc, 0, sizeof(struct sctp_state_cookie));
5592 
5593 	/* the time I built cookie */
5594 	(void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5595 
5596 	/* populate any tie tags */
5597 	if (asoc != NULL) {
5598 		/* unlock before tag selections */
5599 		stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5600 		stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5601 		stc.cookie_life = asoc->cookie_life;
5602 		net = asoc->primary_destination;
5603 	} else {
5604 		stc.tie_tag_my_vtag = 0;
5605 		stc.tie_tag_peer_vtag = 0;
5606 		/* life I will award this cookie */
5607 		stc.cookie_life = inp->sctp_ep.def_cookie_life;
5608 	}
5609 
5610 	/* copy in the ports for later check */
5611 	stc.myport = sh->dest_port;
5612 	stc.peerport = sh->src_port;
5613 
5614 	/*
5615 	 * If we wanted to honor cookie life extensions, we would add to
5616 	 * stc.cookie_life. For now we should NOT honor any extension
5617 	 */
5618 	stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5619 	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5620 		stc.ipv6_addr_legal = 1;
5621 		if (SCTP_IPV6_V6ONLY(inp)) {
5622 			stc.ipv4_addr_legal = 0;
5623 		} else {
5624 			stc.ipv4_addr_legal = 1;
5625 		}
5626 	} else {
5627 		stc.ipv6_addr_legal = 0;
5628 		stc.ipv4_addr_legal = 1;
5629 	}
5630 	stc.ipv4_scope = 0;
5631 	if (net == NULL) {
5632 		to = src;
5633 		switch (dst->sa_family) {
5634 #ifdef INET
5635 		case AF_INET:
5636 			{
5637 				/* lookup address */
5638 				stc.address[0] = src4->sin_addr.s_addr;
5639 				stc.address[1] = 0;
5640 				stc.address[2] = 0;
5641 				stc.address[3] = 0;
5642 				stc.addr_type = SCTP_IPV4_ADDRESS;
5643 				/* local from address */
5644 				stc.laddress[0] = dst4->sin_addr.s_addr;
5645 				stc.laddress[1] = 0;
5646 				stc.laddress[2] = 0;
5647 				stc.laddress[3] = 0;
5648 				stc.laddr_type = SCTP_IPV4_ADDRESS;
5649 				/* scope_id is only for v6 */
5650 				stc.scope_id = 0;
5651 				if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
5652 				    (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
5653 					stc.ipv4_scope = 1;
5654 				}
5655 				/* Must use the address in this case */
5656 				if (sctp_is_address_on_local_host(src, vrf_id)) {
5657 					stc.loopback_scope = 1;
5658 					stc.ipv4_scope = 1;
5659 					stc.site_scope = 1;
5660 					stc.local_scope = 0;
5661 				}
5662 				break;
5663 			}
5664 #endif
5665 #ifdef INET6
5666 		case AF_INET6:
5667 			{
5668 				stc.addr_type = SCTP_IPV6_ADDRESS;
5669 				memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5670 				stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
5671 				if (sctp_is_address_on_local_host(src, vrf_id)) {
5672 					stc.loopback_scope = 1;
5673 					stc.local_scope = 0;
5674 					stc.site_scope = 1;
5675 					stc.ipv4_scope = 1;
5676 				} else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
5677 				    IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
5678 					/*
5679 					 * If the new destination or source
5680 					 * is a LINK_LOCAL we must have
5681 					 * common both site and local scope.
5682 					 * Don't set local scope though
5683 					 * since we must depend on the
5684 					 * source to be added implicitly. We
5685 					 * cannot assure just because we
5686 					 * share one link that all links are
5687 					 * common.
5688 					 */
5689 					stc.local_scope = 0;
5690 					stc.site_scope = 1;
5691 					stc.ipv4_scope = 1;
5692 					/*
5693 					 * we start counting for the private
5694 					 * address stuff at 1. since the
5695 					 * link local we source from won't
5696 					 * show up in our scoped count.
5697 					 */
5698 					cnt_inits_to = 1;
5699 					/*
5700 					 * pull out the scope_id from
5701 					 * incoming pkt
5702 					 */
5703 				} else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
5704 				    IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
5705 					/*
5706 					 * If the new destination or source
5707 					 * is SITE_LOCAL then we must have
5708 					 * site scope in common.
5709 					 */
5710 					stc.site_scope = 1;
5711 				}
5712 				memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5713 				stc.laddr_type = SCTP_IPV6_ADDRESS;
5714 				break;
5715 			}
5716 #endif
5717 		default:
5718 			/* TSNH */
5719 			goto do_a_abort;
5720 			break;
5721 		}
5722 	} else {
5723 		/* set the scope per the existing tcb */
5724 
5725 #ifdef INET6
5726 		struct sctp_nets *lnet;
5727 #endif
5728 
5729 		stc.loopback_scope = asoc->scope.loopback_scope;
5730 		stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5731 		stc.site_scope = asoc->scope.site_scope;
5732 		stc.local_scope = asoc->scope.local_scope;
5733 #ifdef INET6
5734 		/* Why do we not consider IPv4 LL addresses? */
5735 		TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5736 			if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5737 				if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5738 					/*
5739 					 * if we have a LL address, start
5740 					 * counting at 1.
5741 					 */
5742 					cnt_inits_to = 1;
5743 				}
5744 			}
5745 		}
5746 #endif
5747 		/* use the net pointer */
5748 		to = (struct sockaddr *)&net->ro._l_addr;
5749 		switch (to->sa_family) {
5750 #ifdef INET
5751 		case AF_INET:
5752 			sin = (struct sockaddr_in *)to;
5753 			stc.address[0] = sin->sin_addr.s_addr;
5754 			stc.address[1] = 0;
5755 			stc.address[2] = 0;
5756 			stc.address[3] = 0;
5757 			stc.addr_type = SCTP_IPV4_ADDRESS;
5758 			if (net->src_addr_selected == 0) {
5759 				/*
5760 				 * strange case here, the INIT should have
5761 				 * did the selection.
5762 				 */
5763 				net->ro._s_addr = sctp_source_address_selection(inp,
5764 				    stcb, (sctp_route_t *)&net->ro,
5765 				    net, 0, vrf_id);
5766 				if (net->ro._s_addr == NULL)
5767 					return;
5768 
5769 				net->src_addr_selected = 1;
5770 
5771 			}
5772 			stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5773 			stc.laddress[1] = 0;
5774 			stc.laddress[2] = 0;
5775 			stc.laddress[3] = 0;
5776 			stc.laddr_type = SCTP_IPV4_ADDRESS;
5777 			/* scope_id is only for v6 */
5778 			stc.scope_id = 0;
5779 			break;
5780 #endif
5781 #ifdef INET6
5782 		case AF_INET6:
5783 			sin6 = (struct sockaddr_in6 *)to;
5784 			memcpy(&stc.address, &sin6->sin6_addr,
5785 			    sizeof(struct in6_addr));
5786 			stc.addr_type = SCTP_IPV6_ADDRESS;
5787 			stc.scope_id = sin6->sin6_scope_id;
5788 			if (net->src_addr_selected == 0) {
5789 				/*
5790 				 * strange case here, the INIT should have
5791 				 * done the selection.
5792 				 */
5793 				net->ro._s_addr = sctp_source_address_selection(inp,
5794 				    stcb, (sctp_route_t *)&net->ro,
5795 				    net, 0, vrf_id);
5796 				if (net->ro._s_addr == NULL)
5797 					return;
5798 
5799 				net->src_addr_selected = 1;
5800 			}
5801 			memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5802 			    sizeof(struct in6_addr));
5803 			stc.laddr_type = SCTP_IPV6_ADDRESS;
5804 			break;
5805 #endif
5806 		}
5807 	}
5808 	/* Now lets put the SCTP header in place */
5809 	initack = mtod(m, struct sctp_init_ack_chunk *);
5810 	/* Save it off for quick ref */
5811 	stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
5812 	/* who are we */
5813 	memcpy(stc.identification, SCTP_VERSION_STRING,
5814 	    min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5815 	memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5816 	/* now the chunk header */
5817 	initack->ch.chunk_type = SCTP_INITIATION_ACK;
5818 	initack->ch.chunk_flags = 0;
5819 	/* fill in later from mbuf we build */
5820 	initack->ch.chunk_length = 0;
5821 	/* place in my tag */
5822 	if ((asoc != NULL) &&
5823 	    ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5824 	    (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5825 	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5826 		/* re-use the v-tags and init-seq here */
5827 		initack->init.initiate_tag = htonl(asoc->my_vtag);
5828 		initack->init.initial_tsn = htonl(asoc->init_seq_number);
5829 	} else {
5830 		uint32_t vtag, itsn;
5831 
5832 		if (hold_inp_lock) {
5833 			SCTP_INP_INCR_REF(inp);
5834 			SCTP_INP_RUNLOCK(inp);
5835 		}
5836 		if (asoc) {
5837 			atomic_add_int(&asoc->refcnt, 1);
5838 			SCTP_TCB_UNLOCK(stcb);
5839 	new_tag:
5840 			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5841 			if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5842 				/*
5843 				 * Got a duplicate vtag on some guy behind a
5844 				 * nat make sure we don't use it.
5845 				 */
5846 				goto new_tag;
5847 			}
5848 			initack->init.initiate_tag = htonl(vtag);
5849 			/* get a TSN to use too */
5850 			itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5851 			initack->init.initial_tsn = htonl(itsn);
5852 			SCTP_TCB_LOCK(stcb);
5853 			atomic_add_int(&asoc->refcnt, -1);
5854 		} else {
5855 			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5856 			initack->init.initiate_tag = htonl(vtag);
5857 			/* get a TSN to use too */
5858 			initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5859 		}
5860 		if (hold_inp_lock) {
5861 			SCTP_INP_RLOCK(inp);
5862 			SCTP_INP_DECR_REF(inp);
5863 		}
5864 	}
5865 	/* save away my tag to */
5866 	stc.my_vtag = initack->init.initiate_tag;
5867 
5868 	/* set up some of the credits. */
5869 	so = inp->sctp_socket;
5870 	if (so == NULL) {
5871 		/* memory problem */
5872 		sctp_m_freem(m);
5873 		return;
5874 	} else {
5875 		initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5876 	}
5877 	/* set what I want */
5878 	his_limit = ntohs(init_chk->init.num_inbound_streams);
5879 	/* choose what I want */
5880 	if (asoc != NULL) {
5881 		if (asoc->streamoutcnt > asoc->pre_open_streams) {
5882 			i_want = asoc->streamoutcnt;
5883 		} else {
5884 			i_want = asoc->pre_open_streams;
5885 		}
5886 	} else {
5887 		i_want = inp->sctp_ep.pre_open_stream_count;
5888 	}
5889 	if (his_limit < i_want) {
5890 		/* I Want more :< */
5891 		initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5892 	} else {
5893 		/* I can have what I want :> */
5894 		initack->init.num_outbound_streams = htons(i_want);
5895 	}
5896 	/* tell him his limit. */
5897 	initack->init.num_inbound_streams =
5898 	    htons(inp->sctp_ep.max_open_streams_intome);
5899 
5900 	/* adaptation layer indication parameter */
5901 	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5902 		parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
5903 		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
5904 		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5905 		ali->ph.param_length = htons(parameter_len);
5906 		ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
5907 		chunk_len += parameter_len;
5908 	}
5909 	/* ECN parameter */
5910 	if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
5911 	    ((asoc == NULL) && (inp->ecn_supported == 1))) {
5912 		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5913 		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5914 		ph->param_type = htons(SCTP_ECN_CAPABLE);
5915 		ph->param_length = htons(parameter_len);
5916 		chunk_len += parameter_len;
5917 	}
5918 	/* PR-SCTP supported parameter */
5919 	if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5920 	    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5921 		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5922 		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5923 		ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
5924 		ph->param_length = htons(parameter_len);
5925 		chunk_len += parameter_len;
5926 	}
5927 	/* Add NAT friendly parameter */
5928 	if (nat_friendly) {
5929 		parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
5930 		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
5931 		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5932 		ph->param_length = htons(parameter_len);
5933 		chunk_len += parameter_len;
5934 	}
5935 	/* And now tell the peer which extensions we support */
5936 	num_ext = 0;
5937 	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
5938 	if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
5939 	    ((asoc == NULL) && (inp->prsctp_supported == 1))) {
5940 		pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5941 		if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5942 		    ((asoc == NULL) && (inp->idata_supported == 1))) {
5943 			pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
5944 		}
5945 	}
5946 	if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5947 	    ((asoc == NULL) && (inp->auth_supported == 1))) {
5948 		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5949 	}
5950 	if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
5951 	    ((asoc == NULL) && (inp->asconf_supported == 1))) {
5952 		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5953 		pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5954 	}
5955 	if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
5956 	    ((asoc == NULL) && (inp->reconfig_supported == 1))) {
5957 		pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5958 	}
5959 	if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
5960 	    ((asoc == NULL) && (inp->idata_supported == 1))) {
5961 		pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
5962 	}
5963 	if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
5964 	    ((asoc == NULL) && (inp->nrsack_supported == 1))) {
5965 		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5966 	}
5967 	if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
5968 	    ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
5969 		pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5970 	}
5971 	if (num_ext > 0) {
5972 		parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
5973 		pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5974 		pr_supported->ph.param_length = htons(parameter_len);
5975 		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5976 		chunk_len += parameter_len;
5977 	}
5978 	/* add authentication parameters */
5979 	if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
5980 	    ((asoc == NULL) && (inp->auth_supported == 1))) {
5981 		struct sctp_auth_random *randp;
5982 		struct sctp_auth_hmac_algo *hmacs;
5983 		struct sctp_auth_chunk_list *chunks;
5984 
5985 		if (padding_len > 0) {
5986 			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
5987 			chunk_len += padding_len;
5988 			padding_len = 0;
5989 		}
5990 		/* generate and add RANDOM parameter */
5991 		randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
5992 		parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
5993 		    SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5994 		randp->ph.param_type = htons(SCTP_RANDOM);
5995 		randp->ph.param_length = htons(parameter_len);
5996 		SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
5997 		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
5998 		chunk_len += parameter_len;
5999 
6000 		if (padding_len > 0) {
6001 			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6002 			chunk_len += padding_len;
6003 			padding_len = 0;
6004 		}
6005 		/* add HMAC_ALGO parameter */
6006 		hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
6007 		parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
6008 		    sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
6009 		    (uint8_t *)hmacs->hmac_ids);
6010 		hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
6011 		hmacs->ph.param_length = htons(parameter_len);
6012 		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6013 		chunk_len += parameter_len;
6014 
6015 		if (padding_len > 0) {
6016 			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6017 			chunk_len += padding_len;
6018 			padding_len = 0;
6019 		}
6020 		/* add CHUNKS parameter */
6021 		chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
6022 		parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
6023 		    sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
6024 		    chunks->chunk_types);
6025 		chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
6026 		chunks->ph.param_length = htons(parameter_len);
6027 		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6028 		chunk_len += parameter_len;
6029 	}
6030 	SCTP_BUF_LEN(m) = chunk_len;
6031 	m_last = m;
6032 	/* now the addresses */
6033 	/*
6034 	 * To optimize this we could put the scoping stuff into a structure
6035 	 * and remove the individual uint8's from the stc structure. Then we
6036 	 * could just sifa in the address within the stc.. but for now this
6037 	 * is a quick hack to get the address stuff teased apart.
6038 	 */
6039 	scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6040 	scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6041 	scp.loopback_scope = stc.loopback_scope;
6042 	scp.ipv4_local_scope = stc.ipv4_scope;
6043 	scp.local_scope = stc.local_scope;
6044 	scp.site_scope = stc.site_scope;
6045 	m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
6046 	    cnt_inits_to,
6047 	    &padding_len, &chunk_len);
6048 	/* padding_len can only be positive, if no addresses have been added */
6049 	if (padding_len > 0) {
6050 		memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
6051 		chunk_len += padding_len;
6052 		SCTP_BUF_LEN(m) += padding_len;
6053 		padding_len = 0;
6054 	}
6055 	/* tack on the operational error if present */
6056 	if (op_err) {
6057 		parameter_len = 0;
6058 		for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6059 			parameter_len += SCTP_BUF_LEN(m_tmp);
6060 		}
6061 		padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6062 		SCTP_BUF_NEXT(m_last) = op_err;
6063 		while (SCTP_BUF_NEXT(m_last) != NULL) {
6064 			m_last = SCTP_BUF_NEXT(m_last);
6065 		}
6066 		chunk_len += parameter_len;
6067 	}
6068 	if (padding_len > 0) {
6069 		m_last = sctp_add_pad_tombuf(m_last, padding_len);
6070 		if (m_last == NULL) {
6071 			/* Houston we have a problem, no space */
6072 			sctp_m_freem(m);
6073 			return;
6074 		}
6075 		chunk_len += padding_len;
6076 		padding_len = 0;
6077 	}
6078 	/* Now we must build a cookie */
6079 	m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6080 	if (m_cookie == NULL) {
6081 		/* memory problem */
6082 		sctp_m_freem(m);
6083 		return;
6084 	}
6085 	/* Now append the cookie to the end and update the space/size */
6086 	SCTP_BUF_NEXT(m_last) = m_cookie;
6087 	parameter_len = 0;
6088 	for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6089 		parameter_len += SCTP_BUF_LEN(m_tmp);
6090 		if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6091 			m_last = m_tmp;
6092 		}
6093 	}
6094 	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
6095 	chunk_len += parameter_len;
6096 
6097 	/*
6098 	 * Place in the size, but we don't include the last pad (if any) in
6099 	 * the INIT-ACK.
6100 	 */
6101 	initack->ch.chunk_length = htons(chunk_len);
6102 
6103 	/*
6104 	 * Time to sign the cookie, we don't sign over the cookie signature
6105 	 * though thus we set trailer.
6106 	 */
6107 	(void)sctp_hmac_m(SCTP_HMAC,
6108 	    (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6109 	    SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6110 	    (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
6111 	/*
6112 	 * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6113 	 * here since the timer will drive a retranmission.
6114 	 */
6115 	if (padding_len > 0) {
6116 		if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
6117 			sctp_m_freem(m);
6118 			return;
6119 		}
6120 	}
6121 	if (stc.loopback_scope) {
6122 		over_addr = (union sctp_sockstore *)dst;
6123 	} else {
6124 		over_addr = NULL;
6125 	}
6126 
6127 	if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6128 	    0, 0,
6129 	    inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6130 	    port, over_addr,
6131 	    mflowtype, mflowid,
6132 	    SCTP_SO_NOT_LOCKED))) {
6133 		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
6134 		if (error == ENOBUFS) {
6135 			if (asoc != NULL) {
6136 				asoc->ifp_had_enobuf = 1;
6137 			}
6138 			SCTP_STAT_INCR(sctps_lowlevelerr);
6139 		}
6140 	} else {
6141 		if (asoc != NULL) {
6142 			asoc->ifp_had_enobuf = 0;
6143 		}
6144 	}
6145 	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6146 }
6147 
6148 
6149 static void
6150 sctp_prune_prsctp(struct sctp_tcb *stcb,
6151     struct sctp_association *asoc,
6152     struct sctp_sndrcvinfo *srcv,
6153     int dataout)
6154 {
6155 	int freed_spc = 0;
6156 	struct sctp_tmit_chunk *chk, *nchk;
6157 
6158 	SCTP_TCB_LOCK_ASSERT(stcb);
6159 	if ((asoc->prsctp_supported) &&
6160 	    (asoc->sent_queue_cnt_removeable > 0)) {
6161 		TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6162 			/*
6163 			 * Look for chunks marked with the PR_SCTP flag AND
6164 			 * the buffer space flag. If the one being sent is
6165 			 * equal or greater priority then purge the old one
6166 			 * and free some space.
6167 			 */
6168 			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6169 				/*
6170 				 * This one is PR-SCTP AND buffer space
6171 				 * limited type
6172 				 */
6173 				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6174 					/*
6175 					 * Lower numbers equates to higher
6176 					 * priority so if the one we are
6177 					 * looking at has a larger or equal
6178 					 * priority we want to drop the data
6179 					 * and NOT retransmit it.
6180 					 */
6181 					if (chk->data) {
6182 						/*
6183 						 * We release the book_size
6184 						 * if the mbuf is here
6185 						 */
6186 						int ret_spc;
6187 						uint8_t sent;
6188 
6189 						if (chk->sent > SCTP_DATAGRAM_UNSENT)
6190 							sent = 1;
6191 						else
6192 							sent = 0;
6193 						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6194 						    sent,
6195 						    SCTP_SO_LOCKED);
6196 						freed_spc += ret_spc;
6197 						if (freed_spc >= dataout) {
6198 							return;
6199 						}
6200 					}	/* if chunk was present */
6201 				}	/* if of sufficient priority */
6202 			}	/* if chunk has enabled */
6203 		}		/* tailqforeach */
6204 
6205 		TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6206 			/* Here we must move to the sent queue and mark */
6207 			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6208 				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6209 					if (chk->data) {
6210 						/*
6211 						 * We release the book_size
6212 						 * if the mbuf is here
6213 						 */
6214 						int ret_spc;
6215 
6216 						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6217 						    0, SCTP_SO_LOCKED);
6218 
6219 						freed_spc += ret_spc;
6220 						if (freed_spc >= dataout) {
6221 							return;
6222 						}
6223 					}	/* end if chk->data */
6224 				}	/* end if right class */
6225 			}	/* end if chk pr-sctp */
6226 		}		/* tailqforeachsafe (chk) */
6227 	}			/* if enabled in asoc */
6228 }
6229 
6230 int
6231 sctp_get_frag_point(struct sctp_tcb *stcb,
6232     struct sctp_association *asoc)
6233 {
6234 	int siz, ovh;
6235 
6236 	/*
6237 	 * For endpoints that have both v6 and v4 addresses we must reserve
6238 	 * room for the ipv6 header, for those that are only dealing with V4
6239 	 * we use a larger frag point.
6240 	 */
6241 	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6242 		ovh = SCTP_MIN_OVERHEAD;
6243 	} else {
6244 		ovh = SCTP_MIN_V4_OVERHEAD;
6245 	}
6246 	if (stcb->asoc.idata_supported) {
6247 		ovh += sizeof(struct sctp_idata_chunk);
6248 	} else {
6249 		ovh += sizeof(struct sctp_data_chunk);
6250 	}
6251 	if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6252 		siz = asoc->smallest_mtu - ovh;
6253 	else
6254 		siz = (stcb->asoc.sctp_frag_point - ovh);
6255 	/*
6256 	 * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6257 	 */
6258 	/* A data chunk MUST fit in a cluster */
6259 	/* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6260 	/* } */
6261 
6262 	/* adjust for an AUTH chunk if DATA requires auth */
6263 	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6264 		siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6265 
6266 	if (siz % 4) {
6267 		/* make it an even word boundary please */
6268 		siz -= (siz % 4);
6269 	}
6270 	return (siz);
6271 }
6272 
6273 static void
6274 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6275 {
6276 	/*
6277 	 * We assume that the user wants PR_SCTP_TTL if the user provides a
6278 	 * positive lifetime but does not specify any PR_SCTP policy.
6279 	 */
6280 	if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6281 		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6282 	} else if (sp->timetolive > 0) {
6283 		sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6284 		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6285 	} else {
6286 		return;
6287 	}
6288 	switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6289 	case CHUNK_FLAGS_PR_SCTP_BUF:
6290 		/*
6291 		 * Time to live is a priority stored in tv_sec when doing
6292 		 * the buffer drop thing.
6293 		 */
6294 		sp->ts.tv_sec = sp->timetolive;
6295 		sp->ts.tv_usec = 0;
6296 		break;
6297 	case CHUNK_FLAGS_PR_SCTP_TTL:
6298 		{
6299 			struct timeval tv;
6300 
6301 			(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6302 			tv.tv_sec = sp->timetolive / 1000;
6303 			tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6304 			/*
6305 			 * TODO sctp_constants.h needs alternative time
6306 			 * macros when _KERNEL is undefined.
6307 			 */
6308 			timevaladd(&sp->ts, &tv);
6309 		}
6310 		break;
6311 	case CHUNK_FLAGS_PR_SCTP_RTX:
6312 		/*
6313 		 * Time to live is a the number or retransmissions stored in
6314 		 * tv_sec.
6315 		 */
6316 		sp->ts.tv_sec = sp->timetolive;
6317 		sp->ts.tv_usec = 0;
6318 		break;
6319 	default:
6320 		SCTPDBG(SCTP_DEBUG_USRREQ1,
6321 		    "Unknown PR_SCTP policy %u.\n",
6322 		    PR_SCTP_POLICY(sp->sinfo_flags));
6323 		break;
6324 	}
6325 }
6326 
6327 static int
6328 sctp_msg_append(struct sctp_tcb *stcb,
6329     struct sctp_nets *net,
6330     struct mbuf *m,
6331     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6332 {
6333 	int error = 0;
6334 	struct mbuf *at;
6335 	struct sctp_stream_queue_pending *sp = NULL;
6336 	struct sctp_stream_out *strm;
6337 
6338 	/*
6339 	 * Given an mbuf chain, put it into the association send queue and
6340 	 * place it on the wheel
6341 	 */
6342 	if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6343 		/* Invalid stream number */
6344 		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6345 		error = EINVAL;
6346 		goto out_now;
6347 	}
6348 	if ((stcb->asoc.stream_locked) &&
6349 	    (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6350 		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6351 		error = EINVAL;
6352 		goto out_now;
6353 	}
6354 	strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6355 	/* Now can we send this? */
6356 	if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6357 	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6358 	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6359 	    (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6360 		/* got data while shutting down */
6361 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6362 		error = ECONNRESET;
6363 		goto out_now;
6364 	}
6365 	sctp_alloc_a_strmoq(stcb, sp);
6366 	if (sp == NULL) {
6367 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6368 		error = ENOMEM;
6369 		goto out_now;
6370 	}
6371 	sp->sinfo_flags = srcv->sinfo_flags;
6372 	sp->timetolive = srcv->sinfo_timetolive;
6373 	sp->ppid = srcv->sinfo_ppid;
6374 	sp->context = srcv->sinfo_context;
6375 	sp->fsn = 0;
6376 	if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6377 		sp->net = net;
6378 		atomic_add_int(&sp->net->ref_count, 1);
6379 	} else {
6380 		sp->net = NULL;
6381 	}
6382 	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6383 	sp->sid = srcv->sinfo_stream;
6384 	sp->msg_is_complete = 1;
6385 	sp->sender_all_done = 1;
6386 	sp->some_taken = 0;
6387 	sp->data = m;
6388 	sp->tail_mbuf = NULL;
6389 	sctp_set_prsctp_policy(sp);
6390 	/*
6391 	 * We could in theory (for sendall) sifa the length in, but we would
6392 	 * still have to hunt through the chain since we need to setup the
6393 	 * tail_mbuf
6394 	 */
6395 	sp->length = 0;
6396 	for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6397 		if (SCTP_BUF_NEXT(at) == NULL)
6398 			sp->tail_mbuf = at;
6399 		sp->length += SCTP_BUF_LEN(at);
6400 	}
6401 	if (srcv->sinfo_keynumber_valid) {
6402 		sp->auth_keyid = srcv->sinfo_keynumber;
6403 	} else {
6404 		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6405 	}
6406 	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6407 		sctp_auth_key_acquire(stcb, sp->auth_keyid);
6408 		sp->holds_key_ref = 1;
6409 	}
6410 	if (hold_stcb_lock == 0) {
6411 		SCTP_TCB_SEND_LOCK(stcb);
6412 	}
6413 	sctp_snd_sb_alloc(stcb, sp->length);
6414 	atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6415 	TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6416 	stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6417 	m = NULL;
6418 	if (hold_stcb_lock == 0) {
6419 		SCTP_TCB_SEND_UNLOCK(stcb);
6420 	}
6421 out_now:
6422 	if (m) {
6423 		sctp_m_freem(m);
6424 	}
6425 	return (error);
6426 }
6427 
6428 
6429 static struct mbuf *
6430 sctp_copy_mbufchain(struct mbuf *clonechain,
6431     struct mbuf *outchain,
6432     struct mbuf **endofchain,
6433     int can_take_mbuf,
6434     int sizeofcpy,
6435     uint8_t copy_by_ref)
6436 {
6437 	struct mbuf *m;
6438 	struct mbuf *appendchain;
6439 	caddr_t cp;
6440 	int len;
6441 
6442 	if (endofchain == NULL) {
6443 		/* error */
6444 error_out:
6445 		if (outchain)
6446 			sctp_m_freem(outchain);
6447 		return (NULL);
6448 	}
6449 	if (can_take_mbuf) {
6450 		appendchain = clonechain;
6451 	} else {
6452 		if (!copy_by_ref &&
6453 		    (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6454 		    ) {
6455 			/* Its not in a cluster */
6456 			if (*endofchain == NULL) {
6457 				/* lets get a mbuf cluster */
6458 				if (outchain == NULL) {
6459 					/* This is the general case */
6460 			new_mbuf:
6461 					outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6462 					if (outchain == NULL) {
6463 						goto error_out;
6464 					}
6465 					SCTP_BUF_LEN(outchain) = 0;
6466 					*endofchain = outchain;
6467 					/* get the prepend space */
6468 					SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6469 				} else {
6470 					/*
6471 					 * We really should not get a NULL
6472 					 * in endofchain
6473 					 */
6474 					/* find end */
6475 					m = outchain;
6476 					while (m) {
6477 						if (SCTP_BUF_NEXT(m) == NULL) {
6478 							*endofchain = m;
6479 							break;
6480 						}
6481 						m = SCTP_BUF_NEXT(m);
6482 					}
6483 					/* sanity */
6484 					if (*endofchain == NULL) {
6485 						/*
6486 						 * huh, TSNH XXX maybe we
6487 						 * should panic
6488 						 */
6489 						sctp_m_freem(outchain);
6490 						goto new_mbuf;
6491 					}
6492 				}
6493 				/* get the new end of length */
6494 				len = (int)M_TRAILINGSPACE(*endofchain);
6495 			} else {
6496 				/* how much is left at the end? */
6497 				len = (int)M_TRAILINGSPACE(*endofchain);
6498 			}
6499 			/* Find the end of the data, for appending */
6500 			cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6501 
6502 			/* Now lets copy it out */
6503 			if (len >= sizeofcpy) {
6504 				/* It all fits, copy it in */
6505 				m_copydata(clonechain, 0, sizeofcpy, cp);
6506 				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6507 			} else {
6508 				/* fill up the end of the chain */
6509 				if (len > 0) {
6510 					m_copydata(clonechain, 0, len, cp);
6511 					SCTP_BUF_LEN((*endofchain)) += len;
6512 					/* now we need another one */
6513 					sizeofcpy -= len;
6514 				}
6515 				m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
6516 				if (m == NULL) {
6517 					/* We failed */
6518 					goto error_out;
6519 				}
6520 				SCTP_BUF_NEXT((*endofchain)) = m;
6521 				*endofchain = m;
6522 				cp = mtod((*endofchain), caddr_t);
6523 				m_copydata(clonechain, len, sizeofcpy, cp);
6524 				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6525 			}
6526 			return (outchain);
6527 		} else {
6528 			/* copy the old fashion way */
6529 			appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
6530 #ifdef SCTP_MBUF_LOGGING
6531 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6532 				sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
6533 			}
6534 #endif
6535 		}
6536 	}
6537 	if (appendchain == NULL) {
6538 		/* error */
6539 		if (outchain)
6540 			sctp_m_freem(outchain);
6541 		return (NULL);
6542 	}
6543 	if (outchain) {
6544 		/* tack on to the end */
6545 		if (*endofchain != NULL) {
6546 			SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6547 		} else {
6548 			m = outchain;
6549 			while (m) {
6550 				if (SCTP_BUF_NEXT(m) == NULL) {
6551 					SCTP_BUF_NEXT(m) = appendchain;
6552 					break;
6553 				}
6554 				m = SCTP_BUF_NEXT(m);
6555 			}
6556 		}
6557 		/*
6558 		 * save off the end and update the end-chain position
6559 		 */
6560 		m = appendchain;
6561 		while (m) {
6562 			if (SCTP_BUF_NEXT(m) == NULL) {
6563 				*endofchain = m;
6564 				break;
6565 			}
6566 			m = SCTP_BUF_NEXT(m);
6567 		}
6568 		return (outchain);
6569 	} else {
6570 		/* save off the end and update the end-chain position */
6571 		m = appendchain;
6572 		while (m) {
6573 			if (SCTP_BUF_NEXT(m) == NULL) {
6574 				*endofchain = m;
6575 				break;
6576 			}
6577 			m = SCTP_BUF_NEXT(m);
6578 		}
6579 		return (appendchain);
6580 	}
6581 }
6582 
6583 static int
6584 sctp_med_chunk_output(struct sctp_inpcb *inp,
6585     struct sctp_tcb *stcb,
6586     struct sctp_association *asoc,
6587     int *num_out,
6588     int *reason_code,
6589     int control_only, int from_where,
6590     struct timeval *now, int *now_filled, int frag_point, int so_locked
6591 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6592     SCTP_UNUSED
6593 #endif
6594 );
6595 
6596 static void
6597 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6598     uint32_t val SCTP_UNUSED)
6599 {
6600 	struct sctp_copy_all *ca;
6601 	struct mbuf *m;
6602 	int ret = 0;
6603 	int added_control = 0;
6604 	int un_sent, do_chunk_output = 1;
6605 	struct sctp_association *asoc;
6606 	struct sctp_nets *net;
6607 
6608 	ca = (struct sctp_copy_all *)ptr;
6609 	if (ca->m == NULL) {
6610 		return;
6611 	}
6612 	if (ca->inp != inp) {
6613 		/* TSNH */
6614 		return;
6615 	}
6616 	if (ca->sndlen > 0) {
6617 		m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
6618 		if (m == NULL) {
6619 			/* can't copy so we are done */
6620 			ca->cnt_failed++;
6621 			return;
6622 		}
6623 #ifdef SCTP_MBUF_LOGGING
6624 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6625 			sctp_log_mbc(m, SCTP_MBUF_ICOPY);
6626 		}
6627 #endif
6628 	} else {
6629 		m = NULL;
6630 	}
6631 	SCTP_TCB_LOCK_ASSERT(stcb);
6632 	if (stcb->asoc.alternate) {
6633 		net = stcb->asoc.alternate;
6634 	} else {
6635 		net = stcb->asoc.primary_destination;
6636 	}
6637 	if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6638 		/* Abort this assoc with m as the user defined reason */
6639 		if (m != NULL) {
6640 			SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6641 		} else {
6642 			m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6643 			    0, M_NOWAIT, 1, MT_DATA);
6644 			SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6645 		}
6646 		if (m != NULL) {
6647 			struct sctp_paramhdr *ph;
6648 
6649 			ph = mtod(m, struct sctp_paramhdr *);
6650 			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6651 			ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
6652 		}
6653 		/*
6654 		 * We add one here to keep the assoc from dis-appearing on
6655 		 * us.
6656 		 */
6657 		atomic_add_int(&stcb->asoc.refcnt, 1);
6658 		sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6659 		/*
6660 		 * sctp_abort_an_association calls sctp_free_asoc() free
6661 		 * association will NOT free it since we incremented the
6662 		 * refcnt .. we do this to prevent it being freed and things
6663 		 * getting tricky since we could end up (from free_asoc)
6664 		 * calling inpcb_free which would get a recursive lock call
6665 		 * to the iterator lock.. But as a consequence of that the
6666 		 * stcb will return to us un-locked.. since free_asoc
6667 		 * returns with either no TCB or the TCB unlocked, we must
6668 		 * relock.. to unlock in the iterator timer :-0
6669 		 */
6670 		SCTP_TCB_LOCK(stcb);
6671 		atomic_add_int(&stcb->asoc.refcnt, -1);
6672 		goto no_chunk_output;
6673 	} else {
6674 		if (m) {
6675 			ret = sctp_msg_append(stcb, net, m,
6676 			    &ca->sndrcv, 1);
6677 		}
6678 		asoc = &stcb->asoc;
6679 		if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6680 			/* shutdown this assoc */
6681 			if (TAILQ_EMPTY(&asoc->send_queue) &&
6682 			    TAILQ_EMPTY(&asoc->sent_queue) &&
6683 			    sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
6684 				if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6685 					goto abort_anyway;
6686 				}
6687 				/*
6688 				 * there is nothing queued to send, so I'm
6689 				 * done...
6690 				 */
6691 				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6692 				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6693 				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6694 					/*
6695 					 * only send SHUTDOWN the first time
6696 					 * through
6697 					 */
6698 					if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6699 						SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6700 					}
6701 					SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6702 					SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6703 					sctp_stop_timers_for_shutdown(stcb);
6704 					sctp_send_shutdown(stcb, net);
6705 					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6706 					    net);
6707 					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6708 					    asoc->primary_destination);
6709 					added_control = 1;
6710 					do_chunk_output = 0;
6711 				}
6712 			} else {
6713 				/*
6714 				 * we still got (or just got) data to send,
6715 				 * so set SHUTDOWN_PENDING
6716 				 */
6717 				/*
6718 				 * XXX sockets draft says that SCTP_EOF
6719 				 * should be sent with no data.  currently,
6720 				 * we will allow user data to be sent first
6721 				 * and move to SHUTDOWN-PENDING
6722 				 */
6723 				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6724 				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6725 				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6726 					if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
6727 						asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6728 					}
6729 					asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6730 					if (TAILQ_EMPTY(&asoc->send_queue) &&
6731 					    TAILQ_EMPTY(&asoc->sent_queue) &&
6732 					    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6733 						struct mbuf *op_err;
6734 						char msg[SCTP_DIAG_INFO_LEN];
6735 
6736 				abort_anyway:
6737 						snprintf(msg, sizeof(msg),
6738 						    "%s:%d at %s", __FILE__, __LINE__, __func__);
6739 						op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6740 						    msg);
6741 						atomic_add_int(&stcb->asoc.refcnt, 1);
6742 						sctp_abort_an_association(stcb->sctp_ep, stcb,
6743 						    op_err, SCTP_SO_NOT_LOCKED);
6744 						atomic_add_int(&stcb->asoc.refcnt, -1);
6745 						goto no_chunk_output;
6746 					}
6747 					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6748 					    asoc->primary_destination);
6749 				}
6750 			}
6751 
6752 		}
6753 	}
6754 	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6755 	    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6756 
6757 	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6758 	    (stcb->asoc.total_flight > 0) &&
6759 	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6760 		do_chunk_output = 0;
6761 	}
6762 	if (do_chunk_output)
6763 		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6764 	else if (added_control) {
6765 		int num_out, reason, now_filled = 0;
6766 		struct timeval now;
6767 		int frag_point;
6768 
6769 		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6770 		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6771 		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6772 	}
6773 no_chunk_output:
6774 	if (ret) {
6775 		ca->cnt_failed++;
6776 	} else {
6777 		ca->cnt_sent++;
6778 	}
6779 }
6780 
6781 static void
6782 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6783 {
6784 	struct sctp_copy_all *ca;
6785 
6786 	ca = (struct sctp_copy_all *)ptr;
6787 	/*
6788 	 * Do a notify here? Kacheong suggests that the notify be done at
6789 	 * the send time.. so you would push up a notification if any send
6790 	 * failed. Don't know if this is feasible since the only failures we
6791 	 * have is "memory" related and if you cannot get an mbuf to send
6792 	 * the data you surely can't get an mbuf to send up to notify the
6793 	 * user you can't send the data :->
6794 	 */
6795 
6796 	/* now free everything */
6797 	sctp_m_freem(ca->m);
6798 	SCTP_FREE(ca, SCTP_M_COPYAL);
6799 }
6800 
6801 static struct mbuf *
6802 sctp_copy_out_all(struct uio *uio, int len)
6803 {
6804 	struct mbuf *ret, *at;
6805 	int left, willcpy, cancpy, error;
6806 
6807 	ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
6808 	if (ret == NULL) {
6809 		/* TSNH */
6810 		return (NULL);
6811 	}
6812 	left = len;
6813 	SCTP_BUF_LEN(ret) = 0;
6814 	/* save space for the data chunk header */
6815 	cancpy = (int)M_TRAILINGSPACE(ret);
6816 	willcpy = min(cancpy, left);
6817 	at = ret;
6818 	while (left > 0) {
6819 		/* Align data to the end */
6820 		error = uiomove(mtod(at, caddr_t), willcpy, uio);
6821 		if (error) {
6822 	err_out_now:
6823 			sctp_m_freem(at);
6824 			return (NULL);
6825 		}
6826 		SCTP_BUF_LEN(at) = willcpy;
6827 		SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6828 		left -= willcpy;
6829 		if (left > 0) {
6830 			SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
6831 			if (SCTP_BUF_NEXT(at) == NULL) {
6832 				goto err_out_now;
6833 			}
6834 			at = SCTP_BUF_NEXT(at);
6835 			SCTP_BUF_LEN(at) = 0;
6836 			cancpy = (int)M_TRAILINGSPACE(at);
6837 			willcpy = min(cancpy, left);
6838 		}
6839 	}
6840 	return (ret);
6841 }
6842 
6843 static int
6844 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6845     struct sctp_sndrcvinfo *srcv)
6846 {
6847 	int ret;
6848 	struct sctp_copy_all *ca;
6849 
6850 	SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6851 	    SCTP_M_COPYAL);
6852 	if (ca == NULL) {
6853 		sctp_m_freem(m);
6854 		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6855 		return (ENOMEM);
6856 	}
6857 	memset(ca, 0, sizeof(struct sctp_copy_all));
6858 
6859 	ca->inp = inp;
6860 	if (srcv) {
6861 		memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6862 	}
6863 	/*
6864 	 * take off the sendall flag, it would be bad if we failed to do
6865 	 * this :-0
6866 	 */
6867 	ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6868 	/* get length and mbuf chain */
6869 	if (uio) {
6870 		ca->sndlen = (int)uio->uio_resid;
6871 		ca->m = sctp_copy_out_all(uio, ca->sndlen);
6872 		if (ca->m == NULL) {
6873 			SCTP_FREE(ca, SCTP_M_COPYAL);
6874 			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6875 			return (ENOMEM);
6876 		}
6877 	} else {
6878 		/* Gather the length of the send */
6879 		struct mbuf *mat;
6880 
6881 		ca->sndlen = 0;
6882 		for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6883 			ca->sndlen += SCTP_BUF_LEN(mat);
6884 		}
6885 	}
6886 	ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6887 	    SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6888 	    SCTP_ASOC_ANY_STATE,
6889 	    (void *)ca, 0,
6890 	    sctp_sendall_completes, inp, 1);
6891 	if (ret) {
6892 		SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6893 		SCTP_FREE(ca, SCTP_M_COPYAL);
6894 		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6895 		return (EFAULT);
6896 	}
6897 	return (0);
6898 }
6899 
6900 
6901 void
6902 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6903 {
6904 	struct sctp_tmit_chunk *chk, *nchk;
6905 
6906 	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6907 		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6908 			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6909 			if (chk->data) {
6910 				sctp_m_freem(chk->data);
6911 				chk->data = NULL;
6912 			}
6913 			asoc->ctrl_queue_cnt--;
6914 			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6915 		}
6916 	}
6917 }
6918 
6919 void
6920 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6921 {
6922 	struct sctp_association *asoc;
6923 	struct sctp_tmit_chunk *chk, *nchk;
6924 	struct sctp_asconf_chunk *acp;
6925 
6926 	asoc = &stcb->asoc;
6927 	TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6928 		/* find SCTP_ASCONF chunk in queue */
6929 		if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6930 			if (chk->data) {
6931 				acp = mtod(chk->data, struct sctp_asconf_chunk *);
6932 				if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6933 					/* Not Acked yet */
6934 					break;
6935 				}
6936 			}
6937 			TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6938 			if (chk->data) {
6939 				sctp_m_freem(chk->data);
6940 				chk->data = NULL;
6941 			}
6942 			asoc->ctrl_queue_cnt--;
6943 			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6944 		}
6945 	}
6946 }
6947 
6948 
6949 static void
6950 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6951     struct sctp_association *asoc,
6952     struct sctp_tmit_chunk **data_list,
6953     int bundle_at,
6954     struct sctp_nets *net)
6955 {
6956 	int i;
6957 	struct sctp_tmit_chunk *tp1;
6958 
6959 	for (i = 0; i < bundle_at; i++) {
6960 		/* off of the send queue */
6961 		TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6962 		asoc->send_queue_cnt--;
6963 		if (i > 0) {
6964 			/*
6965 			 * Any chunk NOT 0 you zap the time chunk 0 gets
6966 			 * zapped or set based on if a RTO measurment is
6967 			 * needed.
6968 			 */
6969 			data_list[i]->do_rtt = 0;
6970 		}
6971 		/* record time */
6972 		data_list[i]->sent_rcv_time = net->last_sent_time;
6973 		data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6974 		data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
6975 		if (data_list[i]->whoTo == NULL) {
6976 			data_list[i]->whoTo = net;
6977 			atomic_add_int(&net->ref_count, 1);
6978 		}
6979 		/* on to the sent queue */
6980 		tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6981 		if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6982 			struct sctp_tmit_chunk *tpp;
6983 
6984 			/* need to move back */
6985 	back_up_more:
6986 			tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6987 			if (tpp == NULL) {
6988 				TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6989 				goto all_done;
6990 			}
6991 			tp1 = tpp;
6992 			if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
6993 				goto back_up_more;
6994 			}
6995 			TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6996 		} else {
6997 			TAILQ_INSERT_TAIL(&asoc->sent_queue,
6998 			    data_list[i],
6999 			    sctp_next);
7000 		}
7001 all_done:
7002 		/* This does not lower until the cum-ack passes it */
7003 		asoc->sent_queue_cnt++;
7004 		if ((asoc->peers_rwnd <= 0) &&
7005 		    (asoc->total_flight == 0) &&
7006 		    (bundle_at == 1)) {
7007 			/* Mark the chunk as being a window probe */
7008 			SCTP_STAT_INCR(sctps_windowprobed);
7009 		}
7010 #ifdef SCTP_AUDITING_ENABLED
7011 		sctp_audit_log(0xC2, 3);
7012 #endif
7013 		data_list[i]->sent = SCTP_DATAGRAM_SENT;
7014 		data_list[i]->snd_count = 1;
7015 		data_list[i]->rec.data.chunk_was_revoked = 0;
7016 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7017 			sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7018 			    data_list[i]->whoTo->flight_size,
7019 			    data_list[i]->book_size,
7020 			    (uint32_t)(uintptr_t)data_list[i]->whoTo,
7021 			    data_list[i]->rec.data.tsn);
7022 		}
7023 		sctp_flight_size_increase(data_list[i]);
7024 		sctp_total_flight_increase(stcb, data_list[i]);
7025 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7026 			sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7027 			    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7028 		}
7029 		asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7030 		    (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7031 		if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7032 			/* SWS sender side engages */
7033 			asoc->peers_rwnd = 0;
7034 		}
7035 	}
7036 	if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7037 		(*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7038 	}
7039 }
7040 
7041 static void
7042 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7043 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7044     SCTP_UNUSED
7045 #endif
7046 )
7047 {
7048 	struct sctp_tmit_chunk *chk, *nchk;
7049 
7050 	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7051 		if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7052 		    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
7053 		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7054 		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7055 		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7056 		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7057 		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7058 		    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7059 		    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7060 		    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7061 		    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7062 		    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7063 			/* Stray chunks must be cleaned up */
7064 	clean_up_anyway:
7065 			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7066 			if (chk->data) {
7067 				sctp_m_freem(chk->data);
7068 				chk->data = NULL;
7069 			}
7070 			asoc->ctrl_queue_cnt--;
7071 			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7072 				asoc->fwd_tsn_cnt--;
7073 			sctp_free_a_chunk(stcb, chk, so_locked);
7074 		} else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7075 			/* special handling, we must look into the param */
7076 			if (chk != asoc->str_reset) {
7077 				goto clean_up_anyway;
7078 			}
7079 		}
7080 	}
7081 }
7082 
7083 static uint32_t
7084 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
7085     uint32_t space_left, uint32_t frag_point, int eeor_on)
7086 {
7087 	/*
7088 	 * Make a decision on if I should split a msg into multiple parts.
7089 	 * This is only asked of incomplete messages.
7090 	 */
7091 	if (eeor_on) {
7092 		/*
7093 		 * If we are doing EEOR we need to always send it if its the
7094 		 * entire thing, since it might be all the guy is putting in
7095 		 * the hopper.
7096 		 */
7097 		if (space_left >= length) {
7098 			/*-
7099 			 * If we have data outstanding,
7100 			 * we get another chance when the sack
7101 			 * arrives to transmit - wait for more data
7102 			 */
7103 			if (stcb->asoc.total_flight == 0) {
7104 				/*
7105 				 * If nothing is in flight, we zero the
7106 				 * packet counter.
7107 				 */
7108 				return (length);
7109 			}
7110 			return (0);
7111 
7112 		} else {
7113 			/* You can fill the rest */
7114 			return (space_left);
7115 		}
7116 	}
7117 	/*-
7118 	 * For those strange folk that make the send buffer
7119 	 * smaller than our fragmentation point, we can't
7120 	 * get a full msg in so we have to allow splitting.
7121 	 */
7122 	if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7123 		return (length);
7124 	}
7125 	if ((length <= space_left) ||
7126 	    ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7127 		/* Sub-optimial residual don't split in non-eeor mode. */
7128 		return (0);
7129 	}
7130 	/*
7131 	 * If we reach here length is larger than the space_left. Do we wish
7132 	 * to split it for the sake of packet putting together?
7133 	 */
7134 	if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7135 		/* Its ok to split it */
7136 		return (min(space_left, frag_point));
7137 	}
7138 	/* Nope, can't split */
7139 	return (0);
7140 }
7141 
7142 static uint32_t
7143 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7144     struct sctp_stream_out *strq,
7145     uint32_t space_left,
7146     uint32_t frag_point,
7147     int *giveup,
7148     int eeor_mode,
7149     int *bail,
7150     int so_locked
7151 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7152     SCTP_UNUSED
7153 #endif
7154 )
7155 {
7156 	/* Move from the stream to the send_queue keeping track of the total */
7157 	struct sctp_association *asoc;
7158 	struct sctp_stream_queue_pending *sp;
7159 	struct sctp_tmit_chunk *chk;
7160 	struct sctp_data_chunk *dchkh = NULL;
7161 	struct sctp_idata_chunk *ndchkh = NULL;
7162 	uint32_t to_move, length;
7163 	int leading;
7164 	uint8_t rcv_flags = 0;
7165 	uint8_t some_taken;
7166 	uint8_t send_lock_up = 0;
7167 
7168 	SCTP_TCB_LOCK_ASSERT(stcb);
7169 	asoc = &stcb->asoc;
7170 one_more_time:
7171 	/* sa_ignore FREED_MEMORY */
7172 	sp = TAILQ_FIRST(&strq->outqueue);
7173 	if (sp == NULL) {
7174 		if (send_lock_up == 0) {
7175 			SCTP_TCB_SEND_LOCK(stcb);
7176 			send_lock_up = 1;
7177 		}
7178 		sp = TAILQ_FIRST(&strq->outqueue);
7179 		if (sp) {
7180 			goto one_more_time;
7181 		}
7182 		if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
7183 		    (stcb->asoc.idata_supported == 0) &&
7184 		    (strq->last_msg_incomplete)) {
7185 			SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7186 			    strq->sid,
7187 			    strq->last_msg_incomplete);
7188 			strq->last_msg_incomplete = 0;
7189 		}
7190 		to_move = 0;
7191 		if (send_lock_up) {
7192 			SCTP_TCB_SEND_UNLOCK(stcb);
7193 			send_lock_up = 0;
7194 		}
7195 		goto out_of;
7196 	}
7197 	if ((sp->msg_is_complete) && (sp->length == 0)) {
7198 		if (sp->sender_all_done) {
7199 			/*
7200 			 * We are doing differed cleanup. Last time through
7201 			 * when we took all the data the sender_all_done was
7202 			 * not set.
7203 			 */
7204 			if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7205 				SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7206 				SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7207 				    sp->sender_all_done,
7208 				    sp->length,
7209 				    sp->msg_is_complete,
7210 				    sp->put_last_out,
7211 				    send_lock_up);
7212 			}
7213 			if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7214 				SCTP_TCB_SEND_LOCK(stcb);
7215 				send_lock_up = 1;
7216 			}
7217 			atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7218 			TAILQ_REMOVE(&strq->outqueue, sp, next);
7219 			stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7220 			if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7221 			    (strq->chunks_on_queues == 0) &&
7222 			    TAILQ_EMPTY(&strq->outqueue)) {
7223 				stcb->asoc.trigger_reset = 1;
7224 			}
7225 			if (sp->net) {
7226 				sctp_free_remote_addr(sp->net);
7227 				sp->net = NULL;
7228 			}
7229 			if (sp->data) {
7230 				sctp_m_freem(sp->data);
7231 				sp->data = NULL;
7232 			}
7233 			sctp_free_a_strmoq(stcb, sp, so_locked);
7234 			/* we can't be locked to it */
7235 			if (send_lock_up) {
7236 				SCTP_TCB_SEND_UNLOCK(stcb);
7237 				send_lock_up = 0;
7238 			}
7239 			/* back to get the next msg */
7240 			goto one_more_time;
7241 		} else {
7242 			/*
7243 			 * sender just finished this but still holds a
7244 			 * reference
7245 			 */
7246 			*giveup = 1;
7247 			to_move = 0;
7248 			goto out_of;
7249 		}
7250 	} else {
7251 		/* is there some to get */
7252 		if (sp->length == 0) {
7253 			/* no */
7254 			*giveup = 1;
7255 			to_move = 0;
7256 			goto out_of;
7257 		} else if (sp->discard_rest) {
7258 			if (send_lock_up == 0) {
7259 				SCTP_TCB_SEND_LOCK(stcb);
7260 				send_lock_up = 1;
7261 			}
7262 			/* Whack down the size */
7263 			atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7264 			if ((stcb->sctp_socket != NULL) &&
7265 			    ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7266 			    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7267 				atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7268 			}
7269 			if (sp->data) {
7270 				sctp_m_freem(sp->data);
7271 				sp->data = NULL;
7272 				sp->tail_mbuf = NULL;
7273 			}
7274 			sp->length = 0;
7275 			sp->some_taken = 1;
7276 			*giveup = 1;
7277 			to_move = 0;
7278 			goto out_of;
7279 		}
7280 	}
7281 	some_taken = sp->some_taken;
7282 re_look:
7283 	length = sp->length;
7284 	if (sp->msg_is_complete) {
7285 		/* The message is complete */
7286 		to_move = min(length, frag_point);
7287 		if (to_move == length) {
7288 			/* All of it fits in the MTU */
7289 			if (sp->some_taken) {
7290 				rcv_flags |= SCTP_DATA_LAST_FRAG;
7291 			} else {
7292 				rcv_flags |= SCTP_DATA_NOT_FRAG;
7293 			}
7294 			sp->put_last_out = 1;
7295 			if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
7296 				rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7297 			}
7298 		} else {
7299 			/* Not all of it fits, we fragment */
7300 			if (sp->some_taken == 0) {
7301 				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7302 			}
7303 			sp->some_taken = 1;
7304 		}
7305 	} else {
7306 		to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
7307 		if (to_move) {
7308 			/*-
7309 			 * We use a snapshot of length in case it
7310 			 * is expanding during the compare.
7311 			 */
7312 			uint32_t llen;
7313 
7314 			llen = length;
7315 			if (to_move >= llen) {
7316 				to_move = llen;
7317 				if (send_lock_up == 0) {
7318 					/*-
7319 					 * We are taking all of an incomplete msg
7320 					 * thus we need a send lock.
7321 					 */
7322 					SCTP_TCB_SEND_LOCK(stcb);
7323 					send_lock_up = 1;
7324 					if (sp->msg_is_complete) {
7325 						/*
7326 						 * the sender finished the
7327 						 * msg
7328 						 */
7329 						goto re_look;
7330 					}
7331 				}
7332 			}
7333 			if (sp->some_taken == 0) {
7334 				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7335 				sp->some_taken = 1;
7336 			}
7337 		} else {
7338 			/* Nothing to take. */
7339 			*giveup = 1;
7340 			to_move = 0;
7341 			goto out_of;
7342 		}
7343 	}
7344 
7345 	/* If we reach here, we can copy out a chunk */
7346 	sctp_alloc_a_chunk(stcb, chk);
7347 	if (chk == NULL) {
7348 		/* No chunk memory */
7349 		*giveup = 1;
7350 		to_move = 0;
7351 		goto out_of;
7352 	}
7353 	/*
7354 	 * Setup for unordered if needed by looking at the user sent info
7355 	 * flags.
7356 	 */
7357 	if (sp->sinfo_flags & SCTP_UNORDERED) {
7358 		rcv_flags |= SCTP_DATA_UNORDERED;
7359 	}
7360 	if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
7361 	    (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
7362 		rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7363 	}
7364 	/* clear out the chunk before setting up */
7365 	memset(chk, 0, sizeof(*chk));
7366 	chk->rec.data.rcv_flags = rcv_flags;
7367 
7368 	if (to_move >= length) {
7369 		/* we think we can steal the whole thing */
7370 		if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7371 			SCTP_TCB_SEND_LOCK(stcb);
7372 			send_lock_up = 1;
7373 		}
7374 		if (to_move < sp->length) {
7375 			/* bail, it changed */
7376 			goto dont_do_it;
7377 		}
7378 		chk->data = sp->data;
7379 		chk->last_mbuf = sp->tail_mbuf;
7380 		/* register the stealing */
7381 		sp->data = sp->tail_mbuf = NULL;
7382 	} else {
7383 		struct mbuf *m;
7384 
7385 dont_do_it:
7386 		chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
7387 		chk->last_mbuf = NULL;
7388 		if (chk->data == NULL) {
7389 			sp->some_taken = some_taken;
7390 			sctp_free_a_chunk(stcb, chk, so_locked);
7391 			*bail = 1;
7392 			to_move = 0;
7393 			goto out_of;
7394 		}
7395 #ifdef SCTP_MBUF_LOGGING
7396 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7397 			sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
7398 		}
7399 #endif
7400 		/* Pull off the data */
7401 		m_adj(sp->data, to_move);
7402 		/* Now lets work our way down and compact it */
7403 		m = sp->data;
7404 		while (m && (SCTP_BUF_LEN(m) == 0)) {
7405 			sp->data = SCTP_BUF_NEXT(m);
7406 			SCTP_BUF_NEXT(m) = NULL;
7407 			if (sp->tail_mbuf == m) {
7408 				/*-
7409 				 * Freeing tail? TSNH since
7410 				 * we supposedly were taking less
7411 				 * than the sp->length.
7412 				 */
7413 #ifdef INVARIANTS
7414 				panic("Huh, freing tail? - TSNH");
7415 #else
7416 				SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7417 				sp->tail_mbuf = sp->data = NULL;
7418 				sp->length = 0;
7419 #endif
7420 
7421 			}
7422 			sctp_m_free(m);
7423 			m = sp->data;
7424 		}
7425 	}
7426 	if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7427 		chk->copy_by_ref = 1;
7428 	} else {
7429 		chk->copy_by_ref = 0;
7430 	}
7431 	/*
7432 	 * get last_mbuf and counts of mb usage This is ugly but hopefully
7433 	 * its only one mbuf.
7434 	 */
7435 	if (chk->last_mbuf == NULL) {
7436 		chk->last_mbuf = chk->data;
7437 		while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7438 			chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7439 		}
7440 	}
7441 	if (to_move > length) {
7442 		/*- This should not happen either
7443 		 * since we always lower to_move to the size
7444 		 * of sp->length if its larger.
7445 		 */
7446 #ifdef INVARIANTS
7447 		panic("Huh, how can to_move be larger?");
7448 #else
7449 		SCTP_PRINTF("Huh, how can to_move be larger?\n");
7450 		sp->length = 0;
7451 #endif
7452 	} else {
7453 		atomic_subtract_int(&sp->length, to_move);
7454 	}
7455 	if (stcb->asoc.idata_supported == 0) {
7456 		leading = sizeof(struct sctp_data_chunk);
7457 	} else {
7458 		leading = sizeof(struct sctp_idata_chunk);
7459 	}
7460 	if (M_LEADINGSPACE(chk->data) < leading) {
7461 		/* Not enough room for a chunk header, get some */
7462 		struct mbuf *m;
7463 
7464 		m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
7465 		if (m == NULL) {
7466 			/*
7467 			 * we're in trouble here. _PREPEND below will free
7468 			 * all the data if there is no leading space, so we
7469 			 * must put the data back and restore.
7470 			 */
7471 			if (send_lock_up == 0) {
7472 				SCTP_TCB_SEND_LOCK(stcb);
7473 				send_lock_up = 1;
7474 			}
7475 			if (sp->data == NULL) {
7476 				/* unsteal the data */
7477 				sp->data = chk->data;
7478 				sp->tail_mbuf = chk->last_mbuf;
7479 			} else {
7480 				struct mbuf *m_tmp;
7481 
7482 				/* reassemble the data */
7483 				m_tmp = sp->data;
7484 				sp->data = chk->data;
7485 				SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7486 			}
7487 			sp->some_taken = some_taken;
7488 			atomic_add_int(&sp->length, to_move);
7489 			chk->data = NULL;
7490 			*bail = 1;
7491 			sctp_free_a_chunk(stcb, chk, so_locked);
7492 			to_move = 0;
7493 			goto out_of;
7494 		} else {
7495 			SCTP_BUF_LEN(m) = 0;
7496 			SCTP_BUF_NEXT(m) = chk->data;
7497 			chk->data = m;
7498 			M_ALIGN(chk->data, 4);
7499 		}
7500 	}
7501 	if (stcb->asoc.idata_supported == 0) {
7502 		SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
7503 	} else {
7504 		SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_idata_chunk), M_NOWAIT);
7505 	}
7506 	if (chk->data == NULL) {
7507 		/* HELP, TSNH since we assured it would not above? */
7508 #ifdef INVARIANTS
7509 		panic("prepend failes HELP?");
7510 #else
7511 		SCTP_PRINTF("prepend fails HELP?\n");
7512 		sctp_free_a_chunk(stcb, chk, so_locked);
7513 #endif
7514 		*bail = 1;
7515 		to_move = 0;
7516 		goto out_of;
7517 	}
7518 	if (stcb->asoc.idata_supported == 0) {
7519 		sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7520 		chk->book_size = chk->send_size = (uint16_t)(to_move + sizeof(struct sctp_data_chunk));
7521 	} else {
7522 		sctp_snd_sb_alloc(stcb, sizeof(struct sctp_idata_chunk));
7523 		chk->book_size = chk->send_size = (uint16_t)(to_move + sizeof(struct sctp_idata_chunk));
7524 	}
7525 	chk->book_size_scale = 0;
7526 	chk->sent = SCTP_DATAGRAM_UNSENT;
7527 
7528 	chk->flags = 0;
7529 	chk->asoc = &stcb->asoc;
7530 	chk->pad_inplace = 0;
7531 	chk->no_fr_allowed = 0;
7532 	if (stcb->asoc.idata_supported == 0) {
7533 		if (rcv_flags & SCTP_DATA_UNORDERED) {
7534 			/* Just use 0. The receiver ignores the values. */
7535 			chk->rec.data.mid = 0;
7536 		} else {
7537 			chk->rec.data.mid = strq->next_mid_ordered;
7538 			if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7539 				strq->next_mid_ordered++;
7540 			}
7541 		}
7542 	} else {
7543 		if (rcv_flags & SCTP_DATA_UNORDERED) {
7544 			chk->rec.data.mid = strq->next_mid_unordered;
7545 			if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7546 				strq->next_mid_unordered++;
7547 			}
7548 		} else {
7549 			chk->rec.data.mid = strq->next_mid_ordered;
7550 			if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7551 				strq->next_mid_ordered++;
7552 			}
7553 		}
7554 	}
7555 	chk->rec.data.sid = sp->sid;
7556 	chk->rec.data.ppid = sp->ppid;
7557 	chk->rec.data.context = sp->context;
7558 	chk->rec.data.doing_fast_retransmit = 0;
7559 
7560 	chk->rec.data.timetodrop = sp->ts;
7561 	chk->flags = sp->act_flags;
7562 
7563 	if (sp->net) {
7564 		chk->whoTo = sp->net;
7565 		atomic_add_int(&chk->whoTo->ref_count, 1);
7566 	} else
7567 		chk->whoTo = NULL;
7568 
7569 	if (sp->holds_key_ref) {
7570 		chk->auth_keyid = sp->auth_keyid;
7571 		sctp_auth_key_acquire(stcb, chk->auth_keyid);
7572 		chk->holds_key_ref = 1;
7573 	}
7574 	chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
7575 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7576 		sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7577 		    (uint32_t)(uintptr_t)stcb, sp->length,
7578 		    (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
7579 		    chk->rec.data.tsn);
7580 	}
7581 	if (stcb->asoc.idata_supported == 0) {
7582 		dchkh = mtod(chk->data, struct sctp_data_chunk *);
7583 	} else {
7584 		ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
7585 	}
7586 	/*
7587 	 * Put the rest of the things in place now. Size was done earlier in
7588 	 * previous loop prior to padding.
7589 	 */
7590 
7591 #ifdef SCTP_ASOCLOG_OF_TSNS
7592 	SCTP_TCB_LOCK_ASSERT(stcb);
7593 	if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7594 		asoc->tsn_out_at = 0;
7595 		asoc->tsn_out_wrapped = 1;
7596 	}
7597 	asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
7598 	asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
7599 	asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
7600 	asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7601 	asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7602 	asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7603 	asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7604 	asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7605 	asoc->tsn_out_at++;
7606 #endif
7607 	if (stcb->asoc.idata_supported == 0) {
7608 		dchkh->ch.chunk_type = SCTP_DATA;
7609 		dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7610 		dchkh->dp.tsn = htonl(chk->rec.data.tsn);
7611 		dchkh->dp.sid = htons(strq->sid);
7612 		dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
7613 		dchkh->dp.ppid = chk->rec.data.ppid;
7614 		dchkh->ch.chunk_length = htons(chk->send_size);
7615 	} else {
7616 		ndchkh->ch.chunk_type = SCTP_IDATA;
7617 		ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7618 		ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
7619 		ndchkh->dp.sid = htons(strq->sid);
7620 		ndchkh->dp.reserved = htons(0);
7621 		ndchkh->dp.mid = htonl(chk->rec.data.mid);
7622 		if (sp->fsn == 0)
7623 			ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
7624 		else
7625 			ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
7626 		sp->fsn++;
7627 		ndchkh->ch.chunk_length = htons(chk->send_size);
7628 	}
7629 	/* Now advance the chk->send_size by the actual pad needed. */
7630 	if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7631 		/* need a pad */
7632 		struct mbuf *lm;
7633 		int pads;
7634 
7635 		pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7636 		lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
7637 		if (lm != NULL) {
7638 			chk->last_mbuf = lm;
7639 			chk->pad_inplace = 1;
7640 		}
7641 		chk->send_size += pads;
7642 	}
7643 	if (PR_SCTP_ENABLED(chk->flags)) {
7644 		asoc->pr_sctp_cnt++;
7645 	}
7646 	if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7647 		/* All done pull and kill the message */
7648 		if (sp->put_last_out == 0) {
7649 			SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7650 			SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7651 			    sp->sender_all_done,
7652 			    sp->length,
7653 			    sp->msg_is_complete,
7654 			    sp->put_last_out,
7655 			    send_lock_up);
7656 		}
7657 		if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7658 			SCTP_TCB_SEND_LOCK(stcb);
7659 			send_lock_up = 1;
7660 		}
7661 		atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7662 		TAILQ_REMOVE(&strq->outqueue, sp, next);
7663 		stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7664 		if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
7665 		    (strq->chunks_on_queues == 0) &&
7666 		    TAILQ_EMPTY(&strq->outqueue)) {
7667 			stcb->asoc.trigger_reset = 1;
7668 		}
7669 		if (sp->net) {
7670 			sctp_free_remote_addr(sp->net);
7671 			sp->net = NULL;
7672 		}
7673 		if (sp->data) {
7674 			sctp_m_freem(sp->data);
7675 			sp->data = NULL;
7676 		}
7677 		sctp_free_a_strmoq(stcb, sp, so_locked);
7678 	}
7679 	asoc->chunks_on_out_queue++;
7680 	strq->chunks_on_queues++;
7681 	TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7682 	asoc->send_queue_cnt++;
7683 out_of:
7684 	if (send_lock_up) {
7685 		SCTP_TCB_SEND_UNLOCK(stcb);
7686 	}
7687 	return (to_move);
7688 }
7689 
7690 
7691 static void
7692 sctp_fill_outqueue(struct sctp_tcb *stcb,
7693     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7694 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7695     SCTP_UNUSED
7696 #endif
7697 )
7698 {
7699 	struct sctp_association *asoc;
7700 	struct sctp_stream_out *strq;
7701 	uint32_t space_left, moved, total_moved;
7702 	int bail, giveup;
7703 
7704 	SCTP_TCB_LOCK_ASSERT(stcb);
7705 	asoc = &stcb->asoc;
7706 	total_moved = 0;
7707 	switch (net->ro._l_addr.sa.sa_family) {
7708 #ifdef INET
7709 	case AF_INET:
7710 		space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
7711 		break;
7712 #endif
7713 #ifdef INET6
7714 	case AF_INET6:
7715 		space_left = net->mtu - SCTP_MIN_OVERHEAD;
7716 		break;
7717 #endif
7718 	default:
7719 		/* TSNH */
7720 		space_left = net->mtu;
7721 		break;
7722 	}
7723 	/* Need an allowance for the data chunk header too */
7724 	if (stcb->asoc.idata_supported == 0) {
7725 		space_left -= sizeof(struct sctp_data_chunk);
7726 	} else {
7727 		space_left -= sizeof(struct sctp_idata_chunk);
7728 	}
7729 
7730 	/* must make even word boundary */
7731 	space_left &= 0xfffffffc;
7732 	strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7733 	giveup = 0;
7734 	bail = 0;
7735 	while ((space_left > 0) && (strq != NULL)) {
7736 		moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
7737 		    &giveup, eeor_mode, &bail, so_locked);
7738 		stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
7739 		if ((giveup != 0) || (bail != 0)) {
7740 			break;
7741 		}
7742 		strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7743 		total_moved += moved;
7744 		space_left -= moved;
7745 		if (stcb->asoc.idata_supported == 0) {
7746 			if (space_left >= sizeof(struct sctp_data_chunk)) {
7747 				space_left -= sizeof(struct sctp_data_chunk);
7748 			} else {
7749 				space_left = 0;
7750 			}
7751 		} else {
7752 			if (space_left >= sizeof(struct sctp_idata_chunk)) {
7753 				space_left -= sizeof(struct sctp_idata_chunk);
7754 			} else {
7755 				space_left = 0;
7756 			}
7757 		}
7758 		space_left &= 0xfffffffc;
7759 	}
7760 	if (bail != 0)
7761 		*quit_now = 1;
7762 
7763 	stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7764 
7765 	if (total_moved == 0) {
7766 		if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7767 		    (net == stcb->asoc.primary_destination)) {
7768 			/* ran dry for primary network net */
7769 			SCTP_STAT_INCR(sctps_primary_randry);
7770 		} else if (stcb->asoc.sctp_cmt_on_off > 0) {
7771 			/* ran dry with CMT on */
7772 			SCTP_STAT_INCR(sctps_cmt_randry);
7773 		}
7774 	}
7775 }
7776 
7777 void
7778 sctp_fix_ecn_echo(struct sctp_association *asoc)
7779 {
7780 	struct sctp_tmit_chunk *chk;
7781 
7782 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7783 		if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7784 			chk->sent = SCTP_DATAGRAM_UNSENT;
7785 		}
7786 	}
7787 }
7788 
7789 void
7790 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7791 {
7792 	struct sctp_association *asoc;
7793 	struct sctp_tmit_chunk *chk;
7794 	struct sctp_stream_queue_pending *sp;
7795 	unsigned int i;
7796 
7797 	if (net == NULL) {
7798 		return;
7799 	}
7800 	asoc = &stcb->asoc;
7801 	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7802 		TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7803 			if (sp->net == net) {
7804 				sctp_free_remote_addr(sp->net);
7805 				sp->net = NULL;
7806 			}
7807 		}
7808 	}
7809 	TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7810 		if (chk->whoTo == net) {
7811 			sctp_free_remote_addr(chk->whoTo);
7812 			chk->whoTo = NULL;
7813 		}
7814 	}
7815 }
7816 
7817 int
7818 sctp_med_chunk_output(struct sctp_inpcb *inp,
7819     struct sctp_tcb *stcb,
7820     struct sctp_association *asoc,
7821     int *num_out,
7822     int *reason_code,
7823     int control_only, int from_where,
7824     struct timeval *now, int *now_filled, int frag_point, int so_locked
7825 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7826     SCTP_UNUSED
7827 #endif
7828 )
7829 {
7830 	/**
7831 	 * Ok this is the generic chunk service queue. we must do the
7832 	 * following:
7833 	 * - Service the stream queue that is next, moving any
7834 	 *   message (note I must get a complete message i.e. FIRST/MIDDLE and
7835 	 *   LAST to the out queue in one pass) and assigning TSN's. This
7836 	 *   only applys though if the peer does not support NDATA. For NDATA
7837 	 *   chunks its ok to not send the entire message ;-)
7838 	 * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
7839 	 *   fomulate and send the low level chunks. Making sure to combine
7840 	 *   any control in the control chunk queue also.
7841 	 */
7842 	struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7843 	struct mbuf *outchain, *endoutchain;
7844 	struct sctp_tmit_chunk *chk, *nchk;
7845 
7846 	/* temp arrays for unlinking */
7847 	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7848 	int no_fragmentflg, error;
7849 	unsigned int max_rwnd_per_dest, max_send_per_dest;
7850 	int one_chunk, hbflag, skip_data_for_this_net;
7851 	int asconf, cookie, no_out_cnt;
7852 	int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7853 	unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7854 	int tsns_sent = 0;
7855 	uint32_t auth_offset = 0;
7856 	struct sctp_auth_chunk *auth = NULL;
7857 	uint16_t auth_keyid;
7858 	int override_ok = 1;
7859 	int skip_fill_up = 0;
7860 	int data_auth_reqd = 0;
7861 
7862 	/*
7863 	 * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7864 	 * destination.
7865 	 */
7866 	int quit_now = 0;
7867 
7868 	*num_out = 0;
7869 	*reason_code = 0;
7870 	auth_keyid = stcb->asoc.authinfo.active_keyid;
7871 	if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7872 	    (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7873 	    (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7874 		eeor_mode = 1;
7875 	} else {
7876 		eeor_mode = 0;
7877 	}
7878 	ctl_cnt = no_out_cnt = asconf = cookie = 0;
7879 	/*
7880 	 * First lets prime the pump. For each destination, if there is room
7881 	 * in the flight size, attempt to pull an MTU's worth out of the
7882 	 * stream queues into the general send_queue
7883 	 */
7884 #ifdef SCTP_AUDITING_ENABLED
7885 	sctp_audit_log(0xC2, 2);
7886 #endif
7887 	SCTP_TCB_LOCK_ASSERT(stcb);
7888 	hbflag = 0;
7889 	if (control_only)
7890 		no_data_chunks = 1;
7891 	else
7892 		no_data_chunks = 0;
7893 
7894 	/* Nothing to possible to send? */
7895 	if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7896 	    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7897 	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7898 	    TAILQ_EMPTY(&asoc->send_queue) &&
7899 	    sctp_is_there_unsent_data(stcb, so_locked) == 0) {
7900 nothing_to_send:
7901 		*reason_code = 9;
7902 		return (0);
7903 	}
7904 	if (asoc->peers_rwnd == 0) {
7905 		/* No room in peers rwnd */
7906 		*reason_code = 1;
7907 		if (asoc->total_flight > 0) {
7908 			/* we are allowed one chunk in flight */
7909 			no_data_chunks = 1;
7910 		}
7911 	}
7912 	if (stcb->asoc.ecn_echo_cnt_onq) {
7913 		/* Record where a sack goes, if any */
7914 		if (no_data_chunks &&
7915 		    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7916 			/* Nothing but ECNe to send - we don't do that */
7917 			goto nothing_to_send;
7918 		}
7919 		TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7920 			if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7921 			    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7922 				sack_goes_to = chk->whoTo;
7923 				break;
7924 			}
7925 		}
7926 	}
7927 	max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7928 	if (stcb->sctp_socket)
7929 		max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7930 	else
7931 		max_send_per_dest = 0;
7932 	if (no_data_chunks == 0) {
7933 		/* How many non-directed chunks are there? */
7934 		TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7935 			if (chk->whoTo == NULL) {
7936 				/*
7937 				 * We already have non-directed chunks on
7938 				 * the queue, no need to do a fill-up.
7939 				 */
7940 				skip_fill_up = 1;
7941 				break;
7942 			}
7943 		}
7944 
7945 	}
7946 	if ((no_data_chunks == 0) &&
7947 	    (skip_fill_up == 0) &&
7948 	    (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7949 		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7950 			/*
7951 			 * This for loop we are in takes in each net, if
7952 			 * its's got space in cwnd and has data sent to it
7953 			 * (when CMT is off) then it calls
7954 			 * sctp_fill_outqueue for the net. This gets data on
7955 			 * the send queue for that network.
7956 			 *
7957 			 * In sctp_fill_outqueue TSN's are assigned and data
7958 			 * is copied out of the stream buffers. Note mostly
7959 			 * copy by reference (we hope).
7960 			 */
7961 			net->window_probe = 0;
7962 			if ((net != stcb->asoc.alternate) &&
7963 			    ((net->dest_state & SCTP_ADDR_PF) ||
7964 			    (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7965 			    (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7966 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7967 					sctp_log_cwnd(stcb, net, 1,
7968 					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7969 				}
7970 				continue;
7971 			}
7972 			if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7973 			    (net->flight_size == 0)) {
7974 				(*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7975 			}
7976 			if (net->flight_size >= net->cwnd) {
7977 				/* skip this network, no room - can't fill */
7978 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7979 					sctp_log_cwnd(stcb, net, 3,
7980 					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7981 				}
7982 				continue;
7983 			}
7984 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7985 				sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7986 			}
7987 			sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7988 			if (quit_now) {
7989 				/* memory alloc failure */
7990 				no_data_chunks = 1;
7991 				break;
7992 			}
7993 		}
7994 	}
7995 	/* now service each destination and send out what we can for it */
7996 	/* Nothing to send? */
7997 	if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7998 	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7999 	    TAILQ_EMPTY(&asoc->send_queue)) {
8000 		*reason_code = 8;
8001 		return (0);
8002 	}
8003 	if (asoc->sctp_cmt_on_off > 0) {
8004 		/* get the last start point */
8005 		start_at = asoc->last_net_cmt_send_started;
8006 		if (start_at == NULL) {
8007 			/* null so to beginning */
8008 			start_at = TAILQ_FIRST(&asoc->nets);
8009 		} else {
8010 			start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
8011 			if (start_at == NULL) {
8012 				start_at = TAILQ_FIRST(&asoc->nets);
8013 			}
8014 		}
8015 		asoc->last_net_cmt_send_started = start_at;
8016 	} else {
8017 		start_at = TAILQ_FIRST(&asoc->nets);
8018 	}
8019 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
8020 		if (chk->whoTo == NULL) {
8021 			if (asoc->alternate) {
8022 				chk->whoTo = asoc->alternate;
8023 			} else {
8024 				chk->whoTo = asoc->primary_destination;
8025 			}
8026 			atomic_add_int(&chk->whoTo->ref_count, 1);
8027 		}
8028 	}
8029 	old_start_at = NULL;
8030 again_one_more_time:
8031 	for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
8032 		/* how much can we send? */
8033 		/* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
8034 		if (old_start_at && (old_start_at == net)) {
8035 			/* through list ocmpletely. */
8036 			break;
8037 		}
8038 		tsns_sent = 0xa;
8039 		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
8040 		    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
8041 		    (net->flight_size >= net->cwnd)) {
8042 			/*
8043 			 * Nothing on control or asconf and flight is full,
8044 			 * we can skip even in the CMT case.
8045 			 */
8046 			continue;
8047 		}
8048 		bundle_at = 0;
8049 		endoutchain = outchain = NULL;
8050 		no_fragmentflg = 1;
8051 		one_chunk = 0;
8052 		if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8053 			skip_data_for_this_net = 1;
8054 		} else {
8055 			skip_data_for_this_net = 0;
8056 		}
8057 		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8058 #ifdef INET
8059 		case AF_INET:
8060 			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8061 			break;
8062 #endif
8063 #ifdef INET6
8064 		case AF_INET6:
8065 			mtu = net->mtu - SCTP_MIN_OVERHEAD;
8066 			break;
8067 #endif
8068 		default:
8069 			/* TSNH */
8070 			mtu = net->mtu;
8071 			break;
8072 		}
8073 		mx_mtu = mtu;
8074 		to_out = 0;
8075 		if (mtu > asoc->peers_rwnd) {
8076 			if (asoc->total_flight > 0) {
8077 				/* We have a packet in flight somewhere */
8078 				r_mtu = asoc->peers_rwnd;
8079 			} else {
8080 				/* We are always allowed to send one MTU out */
8081 				one_chunk = 1;
8082 				r_mtu = mtu;
8083 			}
8084 		} else {
8085 			r_mtu = mtu;
8086 		}
8087 		error = 0;
8088 		/************************/
8089 		/* ASCONF transmission */
8090 		/************************/
8091 		/* Now first lets go through the asconf queue */
8092 		TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8093 			if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8094 				continue;
8095 			}
8096 			if (chk->whoTo == NULL) {
8097 				if (asoc->alternate == NULL) {
8098 					if (asoc->primary_destination != net) {
8099 						break;
8100 					}
8101 				} else {
8102 					if (asoc->alternate != net) {
8103 						break;
8104 					}
8105 				}
8106 			} else {
8107 				if (chk->whoTo != net) {
8108 					break;
8109 				}
8110 			}
8111 			if (chk->data == NULL) {
8112 				break;
8113 			}
8114 			if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8115 			    chk->sent != SCTP_DATAGRAM_RESEND) {
8116 				break;
8117 			}
8118 			/*
8119 			 * if no AUTH is yet included and this chunk
8120 			 * requires it, make sure to account for it.  We
8121 			 * don't apply the size until the AUTH chunk is
8122 			 * actually added below in case there is no room for
8123 			 * this chunk. NOTE: we overload the use of "omtu"
8124 			 * here
8125 			 */
8126 			if ((auth == NULL) &&
8127 			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8128 			    stcb->asoc.peer_auth_chunks)) {
8129 				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8130 			} else
8131 				omtu = 0;
8132 			/* Here we do NOT factor the r_mtu */
8133 			if ((chk->send_size < (int)(mtu - omtu)) ||
8134 			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8135 				/*
8136 				 * We probably should glom the mbuf chain
8137 				 * from the chk->data for control but the
8138 				 * problem is it becomes yet one more level
8139 				 * of tracking to do if for some reason
8140 				 * output fails. Then I have got to
8141 				 * reconstruct the merged control chain.. el
8142 				 * yucko.. for now we take the easy way and
8143 				 * do the copy
8144 				 */
8145 				/*
8146 				 * Add an AUTH chunk, if chunk requires it
8147 				 * save the offset into the chain for AUTH
8148 				 */
8149 				if ((auth == NULL) &&
8150 				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8151 				    stcb->asoc.peer_auth_chunks))) {
8152 					outchain = sctp_add_auth_chunk(outchain,
8153 					    &endoutchain,
8154 					    &auth,
8155 					    &auth_offset,
8156 					    stcb,
8157 					    chk->rec.chunk_id.id);
8158 					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8159 				}
8160 				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8161 				    (int)chk->rec.chunk_id.can_take_data,
8162 				    chk->send_size, chk->copy_by_ref);
8163 				if (outchain == NULL) {
8164 					*reason_code = 8;
8165 					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8166 					return (ENOMEM);
8167 				}
8168 				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8169 				/* update our MTU size */
8170 				if (mtu > (chk->send_size + omtu))
8171 					mtu -= (chk->send_size + omtu);
8172 				else
8173 					mtu = 0;
8174 				to_out += (chk->send_size + omtu);
8175 				/* Do clear IP_DF ? */
8176 				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8177 					no_fragmentflg = 0;
8178 				}
8179 				if (chk->rec.chunk_id.can_take_data)
8180 					chk->data = NULL;
8181 				/*
8182 				 * set hb flag since we can use these for
8183 				 * RTO
8184 				 */
8185 				hbflag = 1;
8186 				asconf = 1;
8187 				/*
8188 				 * should sysctl this: don't bundle data
8189 				 * with ASCONF since it requires AUTH
8190 				 */
8191 				no_data_chunks = 1;
8192 				chk->sent = SCTP_DATAGRAM_SENT;
8193 				if (chk->whoTo == NULL) {
8194 					chk->whoTo = net;
8195 					atomic_add_int(&net->ref_count, 1);
8196 				}
8197 				chk->snd_count++;
8198 				if (mtu == 0) {
8199 					/*
8200 					 * Ok we are out of room but we can
8201 					 * output without effecting the
8202 					 * flight size since this little guy
8203 					 * is a control only packet.
8204 					 */
8205 					sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8206 					/*
8207 					 * do NOT clear the asconf flag as
8208 					 * it is used to do appropriate
8209 					 * source address selection.
8210 					 */
8211 					if (*now_filled == 0) {
8212 						(void)SCTP_GETTIME_TIMEVAL(now);
8213 						*now_filled = 1;
8214 					}
8215 					net->last_sent_time = *now;
8216 					hbflag = 0;
8217 					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8218 					    (struct sockaddr *)&net->ro._l_addr,
8219 					    outchain, auth_offset, auth,
8220 					    stcb->asoc.authinfo.active_keyid,
8221 					    no_fragmentflg, 0, asconf,
8222 					    inp->sctp_lport, stcb->rport,
8223 					    htonl(stcb->asoc.peer_vtag),
8224 					    net->port, NULL,
8225 					    0, 0,
8226 					    so_locked))) {
8227 						/*
8228 						 * error, we could not
8229 						 * output
8230 						 */
8231 						SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8232 						if (from_where == 0) {
8233 							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8234 						}
8235 						if (error == ENOBUFS) {
8236 							asoc->ifp_had_enobuf = 1;
8237 							SCTP_STAT_INCR(sctps_lowlevelerr);
8238 						}
8239 						/* error, could not output */
8240 						if (error == EHOSTUNREACH) {
8241 							/*
8242 							 * Destination went
8243 							 * unreachable
8244 							 * during this send
8245 							 */
8246 							sctp_move_chunks_from_net(stcb, net);
8247 						}
8248 						*reason_code = 7;
8249 						break;
8250 					} else {
8251 						asoc->ifp_had_enobuf = 0;
8252 					}
8253 					/*
8254 					 * increase the number we sent, if a
8255 					 * cookie is sent we don't tell them
8256 					 * any was sent out.
8257 					 */
8258 					outchain = endoutchain = NULL;
8259 					auth = NULL;
8260 					auth_offset = 0;
8261 					if (!no_out_cnt)
8262 						*num_out += ctl_cnt;
8263 					/* recalc a clean slate and setup */
8264 					switch (net->ro._l_addr.sa.sa_family) {
8265 #ifdef INET
8266 					case AF_INET:
8267 						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8268 						break;
8269 #endif
8270 #ifdef INET6
8271 					case AF_INET6:
8272 						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8273 						break;
8274 #endif
8275 					default:
8276 						/* TSNH */
8277 						mtu = net->mtu;
8278 						break;
8279 					}
8280 					to_out = 0;
8281 					no_fragmentflg = 1;
8282 				}
8283 			}
8284 		}
8285 		if (error != 0) {
8286 			/* try next net */
8287 			continue;
8288 		}
8289 		/************************/
8290 		/* Control transmission */
8291 		/************************/
8292 		/* Now first lets go through the control queue */
8293 		TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8294 			if ((sack_goes_to) &&
8295 			    (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8296 			    (chk->whoTo != sack_goes_to)) {
8297 				/*
8298 				 * if we have a sack in queue, and we are
8299 				 * looking at an ecn echo that is NOT queued
8300 				 * to where the sack is going..
8301 				 */
8302 				if (chk->whoTo == net) {
8303 					/*
8304 					 * Don't transmit it to where its
8305 					 * going (current net)
8306 					 */
8307 					continue;
8308 				} else if (sack_goes_to == net) {
8309 					/*
8310 					 * But do transmit it to this
8311 					 * address
8312 					 */
8313 					goto skip_net_check;
8314 				}
8315 			}
8316 			if (chk->whoTo == NULL) {
8317 				if (asoc->alternate == NULL) {
8318 					if (asoc->primary_destination != net) {
8319 						continue;
8320 					}
8321 				} else {
8322 					if (asoc->alternate != net) {
8323 						continue;
8324 					}
8325 				}
8326 			} else {
8327 				if (chk->whoTo != net) {
8328 					continue;
8329 				}
8330 			}
8331 	skip_net_check:
8332 			if (chk->data == NULL) {
8333 				continue;
8334 			}
8335 			if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8336 				/*
8337 				 * It must be unsent. Cookies and ASCONF's
8338 				 * hang around but there timers will force
8339 				 * when marked for resend.
8340 				 */
8341 				continue;
8342 			}
8343 			/*
8344 			 * if no AUTH is yet included and this chunk
8345 			 * requires it, make sure to account for it.  We
8346 			 * don't apply the size until the AUTH chunk is
8347 			 * actually added below in case there is no room for
8348 			 * this chunk. NOTE: we overload the use of "omtu"
8349 			 * here
8350 			 */
8351 			if ((auth == NULL) &&
8352 			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8353 			    stcb->asoc.peer_auth_chunks)) {
8354 				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8355 			} else
8356 				omtu = 0;
8357 			/* Here we do NOT factor the r_mtu */
8358 			if ((chk->send_size <= (int)(mtu - omtu)) ||
8359 			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8360 				/*
8361 				 * We probably should glom the mbuf chain
8362 				 * from the chk->data for control but the
8363 				 * problem is it becomes yet one more level
8364 				 * of tracking to do if for some reason
8365 				 * output fails. Then I have got to
8366 				 * reconstruct the merged control chain.. el
8367 				 * yucko.. for now we take the easy way and
8368 				 * do the copy
8369 				 */
8370 				/*
8371 				 * Add an AUTH chunk, if chunk requires it
8372 				 * save the offset into the chain for AUTH
8373 				 */
8374 				if ((auth == NULL) &&
8375 				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8376 				    stcb->asoc.peer_auth_chunks))) {
8377 					outchain = sctp_add_auth_chunk(outchain,
8378 					    &endoutchain,
8379 					    &auth,
8380 					    &auth_offset,
8381 					    stcb,
8382 					    chk->rec.chunk_id.id);
8383 					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8384 				}
8385 				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8386 				    (int)chk->rec.chunk_id.can_take_data,
8387 				    chk->send_size, chk->copy_by_ref);
8388 				if (outchain == NULL) {
8389 					*reason_code = 8;
8390 					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8391 					return (ENOMEM);
8392 				}
8393 				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8394 				/* update our MTU size */
8395 				if (mtu > (chk->send_size + omtu))
8396 					mtu -= (chk->send_size + omtu);
8397 				else
8398 					mtu = 0;
8399 				to_out += (chk->send_size + omtu);
8400 				/* Do clear IP_DF ? */
8401 				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8402 					no_fragmentflg = 0;
8403 				}
8404 				if (chk->rec.chunk_id.can_take_data)
8405 					chk->data = NULL;
8406 				/* Mark things to be removed, if needed */
8407 				if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8408 				    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
8409 				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8410 				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8411 				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8412 				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8413 				    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8414 				    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8415 				    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8416 				    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8417 				    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8418 					if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8419 						hbflag = 1;
8420 					}
8421 					/* remove these chunks at the end */
8422 					if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8423 					    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8424 						/* turn off the timer */
8425 						if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8426 							sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8427 							    inp, stcb, net,
8428 							    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8429 						}
8430 					}
8431 					ctl_cnt++;
8432 				} else {
8433 					/*
8434 					 * Other chunks, since they have
8435 					 * timers running (i.e. COOKIE) we
8436 					 * just "trust" that it gets sent or
8437 					 * retransmitted.
8438 					 */
8439 					ctl_cnt++;
8440 					if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8441 						cookie = 1;
8442 						no_out_cnt = 1;
8443 					} else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8444 						/*
8445 						 * Increment ecne send count
8446 						 * here this means we may be
8447 						 * over-zealous in our
8448 						 * counting if the send
8449 						 * fails, but its the best
8450 						 * place to do it (we used
8451 						 * to do it in the queue of
8452 						 * the chunk, but that did
8453 						 * not tell how many times
8454 						 * it was sent.
8455 						 */
8456 						SCTP_STAT_INCR(sctps_sendecne);
8457 					}
8458 					chk->sent = SCTP_DATAGRAM_SENT;
8459 					if (chk->whoTo == NULL) {
8460 						chk->whoTo = net;
8461 						atomic_add_int(&net->ref_count, 1);
8462 					}
8463 					chk->snd_count++;
8464 				}
8465 				if (mtu == 0) {
8466 					/*
8467 					 * Ok we are out of room but we can
8468 					 * output without effecting the
8469 					 * flight size since this little guy
8470 					 * is a control only packet.
8471 					 */
8472 					if (asconf) {
8473 						sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8474 						/*
8475 						 * do NOT clear the asconf
8476 						 * flag as it is used to do
8477 						 * appropriate source
8478 						 * address selection.
8479 						 */
8480 					}
8481 					if (cookie) {
8482 						sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8483 						cookie = 0;
8484 					}
8485 					/* Only HB or ASCONF advances time */
8486 					if (hbflag) {
8487 						if (*now_filled == 0) {
8488 							(void)SCTP_GETTIME_TIMEVAL(now);
8489 							*now_filled = 1;
8490 						}
8491 						net->last_sent_time = *now;
8492 						hbflag = 0;
8493 					}
8494 					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8495 					    (struct sockaddr *)&net->ro._l_addr,
8496 					    outchain,
8497 					    auth_offset, auth,
8498 					    stcb->asoc.authinfo.active_keyid,
8499 					    no_fragmentflg, 0, asconf,
8500 					    inp->sctp_lport, stcb->rport,
8501 					    htonl(stcb->asoc.peer_vtag),
8502 					    net->port, NULL,
8503 					    0, 0,
8504 					    so_locked))) {
8505 						/*
8506 						 * error, we could not
8507 						 * output
8508 						 */
8509 						SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8510 						if (from_where == 0) {
8511 							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8512 						}
8513 						if (error == ENOBUFS) {
8514 							asoc->ifp_had_enobuf = 1;
8515 							SCTP_STAT_INCR(sctps_lowlevelerr);
8516 						}
8517 						if (error == EHOSTUNREACH) {
8518 							/*
8519 							 * Destination went
8520 							 * unreachable
8521 							 * during this send
8522 							 */
8523 							sctp_move_chunks_from_net(stcb, net);
8524 						}
8525 						*reason_code = 7;
8526 						break;
8527 					} else {
8528 						asoc->ifp_had_enobuf = 0;
8529 					}
8530 					/*
8531 					 * increase the number we sent, if a
8532 					 * cookie is sent we don't tell them
8533 					 * any was sent out.
8534 					 */
8535 					outchain = endoutchain = NULL;
8536 					auth = NULL;
8537 					auth_offset = 0;
8538 					if (!no_out_cnt)
8539 						*num_out += ctl_cnt;
8540 					/* recalc a clean slate and setup */
8541 					switch (net->ro._l_addr.sa.sa_family) {
8542 #ifdef INET
8543 					case AF_INET:
8544 						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8545 						break;
8546 #endif
8547 #ifdef INET6
8548 					case AF_INET6:
8549 						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8550 						break;
8551 #endif
8552 					default:
8553 						/* TSNH */
8554 						mtu = net->mtu;
8555 						break;
8556 					}
8557 					to_out = 0;
8558 					no_fragmentflg = 1;
8559 				}
8560 			}
8561 		}
8562 		if (error != 0) {
8563 			/* try next net */
8564 			continue;
8565 		}
8566 		/* JRI: if dest is in PF state, do not send data to it */
8567 		if ((asoc->sctp_cmt_on_off > 0) &&
8568 		    (net != stcb->asoc.alternate) &&
8569 		    (net->dest_state & SCTP_ADDR_PF)) {
8570 			goto no_data_fill;
8571 		}
8572 		if (net->flight_size >= net->cwnd) {
8573 			goto no_data_fill;
8574 		}
8575 		if ((asoc->sctp_cmt_on_off > 0) &&
8576 		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8577 		    (net->flight_size > max_rwnd_per_dest)) {
8578 			goto no_data_fill;
8579 		}
8580 		/*
8581 		 * We need a specific accounting for the usage of the send
8582 		 * buffer. We also need to check the number of messages per
8583 		 * net. For now, this is better than nothing and it disabled
8584 		 * by default...
8585 		 */
8586 		if ((asoc->sctp_cmt_on_off > 0) &&
8587 		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8588 		    (max_send_per_dest > 0) &&
8589 		    (net->flight_size > max_send_per_dest)) {
8590 			goto no_data_fill;
8591 		}
8592 		/*********************/
8593 		/* Data transmission */
8594 		/*********************/
8595 		/*
8596 		 * if AUTH for DATA is required and no AUTH has been added
8597 		 * yet, account for this in the mtu now... if no data can be
8598 		 * bundled, this adjustment won't matter anyways since the
8599 		 * packet will be going out...
8600 		 */
8601 		data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8602 		    stcb->asoc.peer_auth_chunks);
8603 		if (data_auth_reqd && (auth == NULL)) {
8604 			mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8605 		}
8606 		/* now lets add any data within the MTU constraints */
8607 		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8608 #ifdef INET
8609 		case AF_INET:
8610 			if (net->mtu > SCTP_MIN_V4_OVERHEAD)
8611 				omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8612 			else
8613 				omtu = 0;
8614 			break;
8615 #endif
8616 #ifdef INET6
8617 		case AF_INET6:
8618 			if (net->mtu > SCTP_MIN_OVERHEAD)
8619 				omtu = net->mtu - SCTP_MIN_OVERHEAD;
8620 			else
8621 				omtu = 0;
8622 			break;
8623 #endif
8624 		default:
8625 			/* TSNH */
8626 			omtu = 0;
8627 			break;
8628 		}
8629 		if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
8630 		    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
8631 		    (skip_data_for_this_net == 0)) ||
8632 		    (cookie)) {
8633 			TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8634 				if (no_data_chunks) {
8635 					/* let only control go out */
8636 					*reason_code = 1;
8637 					break;
8638 				}
8639 				if (net->flight_size >= net->cwnd) {
8640 					/* skip this net, no room for data */
8641 					*reason_code = 2;
8642 					break;
8643 				}
8644 				if ((chk->whoTo != NULL) &&
8645 				    (chk->whoTo != net)) {
8646 					/* Don't send the chunk on this net */
8647 					continue;
8648 				}
8649 				if (asoc->sctp_cmt_on_off == 0) {
8650 					if ((asoc->alternate) &&
8651 					    (asoc->alternate != net) &&
8652 					    (chk->whoTo == NULL)) {
8653 						continue;
8654 					} else if ((net != asoc->primary_destination) &&
8655 						    (asoc->alternate == NULL) &&
8656 					    (chk->whoTo == NULL)) {
8657 						continue;
8658 					}
8659 				}
8660 				if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8661 					/*-
8662 					 * strange, we have a chunk that is
8663 					 * to big for its destination and
8664 					 * yet no fragment ok flag.
8665 					 * Something went wrong when the
8666 					 * PMTU changed...we did not mark
8667 					 * this chunk for some reason?? I
8668 					 * will fix it here by letting IP
8669 					 * fragment it for now and printing
8670 					 * a warning. This really should not
8671 					 * happen ...
8672 					 */
8673 					SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8674 					    chk->send_size, mtu);
8675 					chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8676 				}
8677 				if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8678 				    ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8679 					struct sctp_data_chunk *dchkh;
8680 
8681 					dchkh = mtod(chk->data, struct sctp_data_chunk *);
8682 					dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8683 				}
8684 				if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8685 				    ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8686 					/* ok we will add this one */
8687 
8688 					/*
8689 					 * Add an AUTH chunk, if chunk
8690 					 * requires it, save the offset into
8691 					 * the chain for AUTH
8692 					 */
8693 					if (data_auth_reqd) {
8694 						if (auth == NULL) {
8695 							outchain = sctp_add_auth_chunk(outchain,
8696 							    &endoutchain,
8697 							    &auth,
8698 							    &auth_offset,
8699 							    stcb,
8700 							    SCTP_DATA);
8701 							auth_keyid = chk->auth_keyid;
8702 							override_ok = 0;
8703 							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8704 						} else if (override_ok) {
8705 							/*
8706 							 * use this data's
8707 							 * keyid
8708 							 */
8709 							auth_keyid = chk->auth_keyid;
8710 							override_ok = 0;
8711 						} else if (auth_keyid != chk->auth_keyid) {
8712 							/*
8713 							 * different keyid,
8714 							 * so done bundling
8715 							 */
8716 							break;
8717 						}
8718 					}
8719 					outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8720 					    chk->send_size, chk->copy_by_ref);
8721 					if (outchain == NULL) {
8722 						SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8723 						if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8724 							sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8725 						}
8726 						*reason_code = 3;
8727 						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8728 						return (ENOMEM);
8729 					}
8730 					/* upate our MTU size */
8731 					/* Do clear IP_DF ? */
8732 					if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8733 						no_fragmentflg = 0;
8734 					}
8735 					/* unsigned subtraction of mtu */
8736 					if (mtu > chk->send_size)
8737 						mtu -= chk->send_size;
8738 					else
8739 						mtu = 0;
8740 					/* unsigned subtraction of r_mtu */
8741 					if (r_mtu > chk->send_size)
8742 						r_mtu -= chk->send_size;
8743 					else
8744 						r_mtu = 0;
8745 
8746 					to_out += chk->send_size;
8747 					if ((to_out > mx_mtu) && no_fragmentflg) {
8748 #ifdef INVARIANTS
8749 						panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8750 #else
8751 						SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8752 						    mx_mtu, to_out);
8753 #endif
8754 					}
8755 					chk->window_probe = 0;
8756 					data_list[bundle_at++] = chk;
8757 					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8758 						break;
8759 					}
8760 					if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8761 						if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8762 							SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8763 						} else {
8764 							SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8765 						}
8766 						if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8767 						    ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8768 							/*
8769 							 * Count number of
8770 							 * user msg's that
8771 							 * were fragmented
8772 							 * we do this by
8773 							 * counting when we
8774 							 * see a LAST
8775 							 * fragment only.
8776 							 */
8777 							SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8778 					}
8779 					if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8780 						if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8781 							data_list[0]->window_probe = 1;
8782 							net->window_probe = 1;
8783 						}
8784 						break;
8785 					}
8786 				} else {
8787 					/*
8788 					 * Must be sent in order of the
8789 					 * TSN's (on a network)
8790 					 */
8791 					break;
8792 				}
8793 			}	/* for (chunk gather loop for this net) */
8794 		}		/* if asoc.state OPEN */
8795 no_data_fill:
8796 		/* Is there something to send for this destination? */
8797 		if (outchain) {
8798 			/* We may need to start a control timer or two */
8799 			if (asconf) {
8800 				sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8801 				    stcb, net);
8802 				/*
8803 				 * do NOT clear the asconf flag as it is
8804 				 * used to do appropriate source address
8805 				 * selection.
8806 				 */
8807 			}
8808 			if (cookie) {
8809 				sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8810 				cookie = 0;
8811 			}
8812 			/* must start a send timer if data is being sent */
8813 			if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8814 				/*
8815 				 * no timer running on this destination
8816 				 * restart it.
8817 				 */
8818 				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8819 			}
8820 			if (bundle_at || hbflag) {
8821 				/* For data/asconf and hb set time */
8822 				if (*now_filled == 0) {
8823 					(void)SCTP_GETTIME_TIMEVAL(now);
8824 					*now_filled = 1;
8825 				}
8826 				net->last_sent_time = *now;
8827 			}
8828 			/* Now send it, if there is anything to send :> */
8829 			if ((error = sctp_lowlevel_chunk_output(inp,
8830 			    stcb,
8831 			    net,
8832 			    (struct sockaddr *)&net->ro._l_addr,
8833 			    outchain,
8834 			    auth_offset,
8835 			    auth,
8836 			    auth_keyid,
8837 			    no_fragmentflg,
8838 			    bundle_at,
8839 			    asconf,
8840 			    inp->sctp_lport, stcb->rport,
8841 			    htonl(stcb->asoc.peer_vtag),
8842 			    net->port, NULL,
8843 			    0, 0,
8844 			    so_locked))) {
8845 				/* error, we could not output */
8846 				SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8847 				if (from_where == 0) {
8848 					SCTP_STAT_INCR(sctps_lowlevelerrusr);
8849 				}
8850 				if (error == ENOBUFS) {
8851 					asoc->ifp_had_enobuf = 1;
8852 					SCTP_STAT_INCR(sctps_lowlevelerr);
8853 				}
8854 				if (error == EHOSTUNREACH) {
8855 					/*
8856 					 * Destination went unreachable
8857 					 * during this send
8858 					 */
8859 					sctp_move_chunks_from_net(stcb, net);
8860 				}
8861 				*reason_code = 6;
8862 				/*-
8863 				 * I add this line to be paranoid. As far as
8864 				 * I can tell the continue, takes us back to
8865 				 * the top of the for, but just to make sure
8866 				 * I will reset these again here.
8867 				 */
8868 				ctl_cnt = bundle_at = 0;
8869 				continue;	/* This takes us back to the
8870 						 * for() for the nets. */
8871 			} else {
8872 				asoc->ifp_had_enobuf = 0;
8873 			}
8874 			endoutchain = NULL;
8875 			auth = NULL;
8876 			auth_offset = 0;
8877 			if (!no_out_cnt) {
8878 				*num_out += (ctl_cnt + bundle_at);
8879 			}
8880 			if (bundle_at) {
8881 				/* setup for a RTO measurement */
8882 				tsns_sent = data_list[0]->rec.data.tsn;
8883 				/* fill time if not already filled */
8884 				if (*now_filled == 0) {
8885 					(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8886 					*now_filled = 1;
8887 					*now = asoc->time_last_sent;
8888 				} else {
8889 					asoc->time_last_sent = *now;
8890 				}
8891 				if (net->rto_needed) {
8892 					data_list[0]->do_rtt = 1;
8893 					net->rto_needed = 0;
8894 				}
8895 				SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8896 				sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8897 			}
8898 			if (one_chunk) {
8899 				break;
8900 			}
8901 		}
8902 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8903 			sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8904 		}
8905 	}
8906 	if (old_start_at == NULL) {
8907 		old_start_at = start_at;
8908 		start_at = TAILQ_FIRST(&asoc->nets);
8909 		if (old_start_at)
8910 			goto again_one_more_time;
8911 	}
8912 	/*
8913 	 * At the end there should be no NON timed chunks hanging on this
8914 	 * queue.
8915 	 */
8916 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8917 		sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8918 	}
8919 	if ((*num_out == 0) && (*reason_code == 0)) {
8920 		*reason_code = 4;
8921 	} else {
8922 		*reason_code = 5;
8923 	}
8924 	sctp_clean_up_ctl(stcb, asoc, so_locked);
8925 	return (0);
8926 }
8927 
8928 void
8929 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8930 {
8931 	/*-
8932 	 * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8933 	 * the control chunk queue.
8934 	 */
8935 	struct sctp_chunkhdr *hdr;
8936 	struct sctp_tmit_chunk *chk;
8937 	struct mbuf *mat, *last_mbuf;
8938 	uint32_t chunk_length;
8939 	uint16_t padding_length;
8940 
8941 	SCTP_TCB_LOCK_ASSERT(stcb);
8942 	SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
8943 	if (op_err == NULL) {
8944 		return;
8945 	}
8946 	last_mbuf = NULL;
8947 	chunk_length = 0;
8948 	for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
8949 		chunk_length += SCTP_BUF_LEN(mat);
8950 		if (SCTP_BUF_NEXT(mat) == NULL) {
8951 			last_mbuf = mat;
8952 		}
8953 	}
8954 	if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
8955 		sctp_m_freem(op_err);
8956 		return;
8957 	}
8958 	padding_length = chunk_length % 4;
8959 	if (padding_length != 0) {
8960 		padding_length = 4 - padding_length;
8961 	}
8962 	if (padding_length != 0) {
8963 		if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
8964 			sctp_m_freem(op_err);
8965 			return;
8966 		}
8967 	}
8968 	sctp_alloc_a_chunk(stcb, chk);
8969 	if (chk == NULL) {
8970 		/* no memory */
8971 		sctp_m_freem(op_err);
8972 		return;
8973 	}
8974 	chk->copy_by_ref = 0;
8975 	chk->send_size = (uint16_t)chunk_length;
8976 	chk->sent = SCTP_DATAGRAM_UNSENT;
8977 	chk->snd_count = 0;
8978 	chk->asoc = &stcb->asoc;
8979 	chk->data = op_err;
8980 	chk->whoTo = NULL;
8981 	chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8982 	chk->rec.chunk_id.can_take_data = 0;
8983 	hdr = mtod(op_err, struct sctp_chunkhdr *);
8984 	hdr->chunk_type = SCTP_OPERATION_ERROR;
8985 	hdr->chunk_flags = 0;
8986 	hdr->chunk_length = htons(chk->send_size);
8987 	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8988 	chk->asoc->ctrl_queue_cnt++;
8989 }
8990 
8991 int
8992 sctp_send_cookie_echo(struct mbuf *m,
8993     int offset,
8994     struct sctp_tcb *stcb,
8995     struct sctp_nets *net)
8996 {
8997 	/*-
8998 	 * pull out the cookie and put it at the front of the control chunk
8999 	 * queue.
9000 	 */
9001 	int at;
9002 	struct mbuf *cookie;
9003 	struct sctp_paramhdr parm, *phdr;
9004 	struct sctp_chunkhdr *hdr;
9005 	struct sctp_tmit_chunk *chk;
9006 	uint16_t ptype, plen;
9007 
9008 	SCTP_TCB_LOCK_ASSERT(stcb);
9009 	/* First find the cookie in the param area */
9010 	cookie = NULL;
9011 	at = offset + sizeof(struct sctp_init_chunk);
9012 	for (;;) {
9013 		phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
9014 		if (phdr == NULL) {
9015 			return (-3);
9016 		}
9017 		ptype = ntohs(phdr->param_type);
9018 		plen = ntohs(phdr->param_length);
9019 		if (ptype == SCTP_STATE_COOKIE) {
9020 			int pad;
9021 
9022 			/* found the cookie */
9023 			if ((pad = (plen % 4))) {
9024 				plen += 4 - pad;
9025 			}
9026 			cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
9027 			if (cookie == NULL) {
9028 				/* No memory */
9029 				return (-2);
9030 			}
9031 #ifdef SCTP_MBUF_LOGGING
9032 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9033 				sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
9034 			}
9035 #endif
9036 			break;
9037 		}
9038 		at += SCTP_SIZE32(plen);
9039 	}
9040 	/* ok, we got the cookie lets change it into a cookie echo chunk */
9041 	/* first the change from param to cookie */
9042 	hdr = mtod(cookie, struct sctp_chunkhdr *);
9043 	hdr->chunk_type = SCTP_COOKIE_ECHO;
9044 	hdr->chunk_flags = 0;
9045 	/* get the chunk stuff now and place it in the FRONT of the queue */
9046 	sctp_alloc_a_chunk(stcb, chk);
9047 	if (chk == NULL) {
9048 		/* no memory */
9049 		sctp_m_freem(cookie);
9050 		return (-5);
9051 	}
9052 	chk->copy_by_ref = 0;
9053 	chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9054 	chk->rec.chunk_id.can_take_data = 0;
9055 	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9056 	chk->send_size = plen;
9057 	chk->sent = SCTP_DATAGRAM_UNSENT;
9058 	chk->snd_count = 0;
9059 	chk->asoc = &stcb->asoc;
9060 	chk->data = cookie;
9061 	chk->whoTo = net;
9062 	atomic_add_int(&chk->whoTo->ref_count, 1);
9063 	TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9064 	chk->asoc->ctrl_queue_cnt++;
9065 	return (0);
9066 }
9067 
9068 void
9069 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9070     struct mbuf *m,
9071     int offset,
9072     int chk_length,
9073     struct sctp_nets *net)
9074 {
9075 	/*
9076 	 * take a HB request and make it into a HB ack and send it.
9077 	 */
9078 	struct mbuf *outchain;
9079 	struct sctp_chunkhdr *chdr;
9080 	struct sctp_tmit_chunk *chk;
9081 
9082 
9083 	if (net == NULL)
9084 		/* must have a net pointer */
9085 		return;
9086 
9087 	outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
9088 	if (outchain == NULL) {
9089 		/* gak out of memory */
9090 		return;
9091 	}
9092 #ifdef SCTP_MBUF_LOGGING
9093 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9094 		sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
9095 	}
9096 #endif
9097 	chdr = mtod(outchain, struct sctp_chunkhdr *);
9098 	chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9099 	chdr->chunk_flags = 0;
9100 	if (chk_length % 4) {
9101 		/* need pad */
9102 		uint32_t cpthis = 0;
9103 		int padlen;
9104 
9105 		padlen = 4 - (chk_length % 4);
9106 		m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9107 	}
9108 	sctp_alloc_a_chunk(stcb, chk);
9109 	if (chk == NULL) {
9110 		/* no memory */
9111 		sctp_m_freem(outchain);
9112 		return;
9113 	}
9114 	chk->copy_by_ref = 0;
9115 	chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9116 	chk->rec.chunk_id.can_take_data = 1;
9117 	chk->flags = 0;
9118 	chk->send_size = chk_length;
9119 	chk->sent = SCTP_DATAGRAM_UNSENT;
9120 	chk->snd_count = 0;
9121 	chk->asoc = &stcb->asoc;
9122 	chk->data = outchain;
9123 	chk->whoTo = net;
9124 	atomic_add_int(&chk->whoTo->ref_count, 1);
9125 	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9126 	chk->asoc->ctrl_queue_cnt++;
9127 }
9128 
9129 void
9130 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9131 {
9132 	/* formulate and queue a cookie-ack back to sender */
9133 	struct mbuf *cookie_ack;
9134 	struct sctp_chunkhdr *hdr;
9135 	struct sctp_tmit_chunk *chk;
9136 
9137 	SCTP_TCB_LOCK_ASSERT(stcb);
9138 
9139 	cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
9140 	if (cookie_ack == NULL) {
9141 		/* no mbuf's */
9142 		return;
9143 	}
9144 	SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9145 	sctp_alloc_a_chunk(stcb, chk);
9146 	if (chk == NULL) {
9147 		/* no memory */
9148 		sctp_m_freem(cookie_ack);
9149 		return;
9150 	}
9151 	chk->copy_by_ref = 0;
9152 	chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9153 	chk->rec.chunk_id.can_take_data = 1;
9154 	chk->flags = 0;
9155 	chk->send_size = sizeof(struct sctp_chunkhdr);
9156 	chk->sent = SCTP_DATAGRAM_UNSENT;
9157 	chk->snd_count = 0;
9158 	chk->asoc = &stcb->asoc;
9159 	chk->data = cookie_ack;
9160 	if (chk->asoc->last_control_chunk_from != NULL) {
9161 		chk->whoTo = chk->asoc->last_control_chunk_from;
9162 		atomic_add_int(&chk->whoTo->ref_count, 1);
9163 	} else {
9164 		chk->whoTo = NULL;
9165 	}
9166 	hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9167 	hdr->chunk_type = SCTP_COOKIE_ACK;
9168 	hdr->chunk_flags = 0;
9169 	hdr->chunk_length = htons(chk->send_size);
9170 	SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9171 	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9172 	chk->asoc->ctrl_queue_cnt++;
9173 	return;
9174 }
9175 
9176 
9177 void
9178 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9179 {
9180 	/* formulate and queue a SHUTDOWN-ACK back to the sender */
9181 	struct mbuf *m_shutdown_ack;
9182 	struct sctp_shutdown_ack_chunk *ack_cp;
9183 	struct sctp_tmit_chunk *chk;
9184 
9185 	m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9186 	if (m_shutdown_ack == NULL) {
9187 		/* no mbuf's */
9188 		return;
9189 	}
9190 	SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9191 	sctp_alloc_a_chunk(stcb, chk);
9192 	if (chk == NULL) {
9193 		/* no memory */
9194 		sctp_m_freem(m_shutdown_ack);
9195 		return;
9196 	}
9197 	chk->copy_by_ref = 0;
9198 	chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9199 	chk->rec.chunk_id.can_take_data = 1;
9200 	chk->flags = 0;
9201 	chk->send_size = sizeof(struct sctp_chunkhdr);
9202 	chk->sent = SCTP_DATAGRAM_UNSENT;
9203 	chk->snd_count = 0;
9204 	chk->flags = 0;
9205 	chk->asoc = &stcb->asoc;
9206 	chk->data = m_shutdown_ack;
9207 	chk->whoTo = net;
9208 	if (chk->whoTo) {
9209 		atomic_add_int(&chk->whoTo->ref_count, 1);
9210 	}
9211 	ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9212 	ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9213 	ack_cp->ch.chunk_flags = 0;
9214 	ack_cp->ch.chunk_length = htons(chk->send_size);
9215 	SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9216 	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9217 	chk->asoc->ctrl_queue_cnt++;
9218 	return;
9219 }
9220 
9221 void
9222 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9223 {
9224 	/* formulate and queue a SHUTDOWN to the sender */
9225 	struct mbuf *m_shutdown;
9226 	struct sctp_shutdown_chunk *shutdown_cp;
9227 	struct sctp_tmit_chunk *chk;
9228 
9229 	TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
9230 		if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
9231 			/* We already have a SHUTDOWN queued. Reuse it. */
9232 			if (chk->whoTo) {
9233 				sctp_free_remote_addr(chk->whoTo);
9234 				chk->whoTo = NULL;
9235 			}
9236 			break;
9237 		}
9238 	}
9239 	if (chk == NULL) {
9240 		m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
9241 		if (m_shutdown == NULL) {
9242 			/* no mbuf's */
9243 			return;
9244 		}
9245 		SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9246 		sctp_alloc_a_chunk(stcb, chk);
9247 		if (chk == NULL) {
9248 			/* no memory */
9249 			sctp_m_freem(m_shutdown);
9250 			return;
9251 		}
9252 		chk->copy_by_ref = 0;
9253 		chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9254 		chk->rec.chunk_id.can_take_data = 1;
9255 		chk->flags = 0;
9256 		chk->send_size = sizeof(struct sctp_shutdown_chunk);
9257 		chk->sent = SCTP_DATAGRAM_UNSENT;
9258 		chk->snd_count = 0;
9259 		chk->flags = 0;
9260 		chk->asoc = &stcb->asoc;
9261 		chk->data = m_shutdown;
9262 		chk->whoTo = net;
9263 		if (chk->whoTo) {
9264 			atomic_add_int(&chk->whoTo->ref_count, 1);
9265 		}
9266 		shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9267 		shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9268 		shutdown_cp->ch.chunk_flags = 0;
9269 		shutdown_cp->ch.chunk_length = htons(chk->send_size);
9270 		shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9271 		SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9272 		TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9273 		chk->asoc->ctrl_queue_cnt++;
9274 	} else {
9275 		TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
9276 		chk->whoTo = net;
9277 		if (chk->whoTo) {
9278 			atomic_add_int(&chk->whoTo->ref_count, 1);
9279 		}
9280 		shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
9281 		shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9282 		TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
9283 	}
9284 	return;
9285 }
9286 
9287 void
9288 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9289 {
9290 	/*
9291 	 * formulate and queue an ASCONF to the peer. ASCONF parameters
9292 	 * should be queued on the assoc queue.
9293 	 */
9294 	struct sctp_tmit_chunk *chk;
9295 	struct mbuf *m_asconf;
9296 	int len;
9297 
9298 	SCTP_TCB_LOCK_ASSERT(stcb);
9299 
9300 	if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9301 	    (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9302 		/* can't send a new one if there is one in flight already */
9303 		return;
9304 	}
9305 	/* compose an ASCONF chunk, maximum length is PMTU */
9306 	m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9307 	if (m_asconf == NULL) {
9308 		return;
9309 	}
9310 	sctp_alloc_a_chunk(stcb, chk);
9311 	if (chk == NULL) {
9312 		/* no memory */
9313 		sctp_m_freem(m_asconf);
9314 		return;
9315 	}
9316 	chk->copy_by_ref = 0;
9317 	chk->rec.chunk_id.id = SCTP_ASCONF;
9318 	chk->rec.chunk_id.can_take_data = 0;
9319 	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9320 	chk->data = m_asconf;
9321 	chk->send_size = len;
9322 	chk->sent = SCTP_DATAGRAM_UNSENT;
9323 	chk->snd_count = 0;
9324 	chk->asoc = &stcb->asoc;
9325 	chk->whoTo = net;
9326 	if (chk->whoTo) {
9327 		atomic_add_int(&chk->whoTo->ref_count, 1);
9328 	}
9329 	TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9330 	chk->asoc->ctrl_queue_cnt++;
9331 	return;
9332 }
9333 
9334 void
9335 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9336 {
9337 	/*
9338 	 * formulate and queue a asconf-ack back to sender. the asconf-ack
9339 	 * must be stored in the tcb.
9340 	 */
9341 	struct sctp_tmit_chunk *chk;
9342 	struct sctp_asconf_ack *ack, *latest_ack;
9343 	struct mbuf *m_ack;
9344 	struct sctp_nets *net = NULL;
9345 
9346 	SCTP_TCB_LOCK_ASSERT(stcb);
9347 	/* Get the latest ASCONF-ACK */
9348 	latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9349 	if (latest_ack == NULL) {
9350 		return;
9351 	}
9352 	if (latest_ack->last_sent_to != NULL &&
9353 	    latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9354 		/* we're doing a retransmission */
9355 		net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9356 		if (net == NULL) {
9357 			/* no alternate */
9358 			if (stcb->asoc.last_control_chunk_from == NULL) {
9359 				if (stcb->asoc.alternate) {
9360 					net = stcb->asoc.alternate;
9361 				} else {
9362 					net = stcb->asoc.primary_destination;
9363 				}
9364 			} else {
9365 				net = stcb->asoc.last_control_chunk_from;
9366 			}
9367 		}
9368 	} else {
9369 		/* normal case */
9370 		if (stcb->asoc.last_control_chunk_from == NULL) {
9371 			if (stcb->asoc.alternate) {
9372 				net = stcb->asoc.alternate;
9373 			} else {
9374 				net = stcb->asoc.primary_destination;
9375 			}
9376 		} else {
9377 			net = stcb->asoc.last_control_chunk_from;
9378 		}
9379 	}
9380 	latest_ack->last_sent_to = net;
9381 
9382 	TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9383 		if (ack->data == NULL) {
9384 			continue;
9385 		}
9386 		/* copy the asconf_ack */
9387 		m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
9388 		if (m_ack == NULL) {
9389 			/* couldn't copy it */
9390 			return;
9391 		}
9392 #ifdef SCTP_MBUF_LOGGING
9393 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9394 			sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
9395 		}
9396 #endif
9397 
9398 		sctp_alloc_a_chunk(stcb, chk);
9399 		if (chk == NULL) {
9400 			/* no memory */
9401 			if (m_ack)
9402 				sctp_m_freem(m_ack);
9403 			return;
9404 		}
9405 		chk->copy_by_ref = 0;
9406 		chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9407 		chk->rec.chunk_id.can_take_data = 1;
9408 		chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9409 		chk->whoTo = net;
9410 		if (chk->whoTo) {
9411 			atomic_add_int(&chk->whoTo->ref_count, 1);
9412 		}
9413 		chk->data = m_ack;
9414 		chk->send_size = ack->len;
9415 		chk->sent = SCTP_DATAGRAM_UNSENT;
9416 		chk->snd_count = 0;
9417 		chk->asoc = &stcb->asoc;
9418 
9419 		TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9420 		chk->asoc->ctrl_queue_cnt++;
9421 	}
9422 	return;
9423 }
9424 
9425 
9426 static int
9427 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9428     struct sctp_tcb *stcb,
9429     struct sctp_association *asoc,
9430     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9431 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9432     SCTP_UNUSED
9433 #endif
9434 )
9435 {
9436 	/*-
9437 	 * send out one MTU of retransmission. If fast_retransmit is
9438 	 * happening we ignore the cwnd. Otherwise we obey the cwnd and
9439 	 * rwnd. For a Cookie or Asconf in the control chunk queue we
9440 	 * retransmit them by themselves.
9441 	 *
9442 	 * For data chunks we will pick out the lowest TSN's in the sent_queue
9443 	 * marked for resend and bundle them all together (up to a MTU of
9444 	 * destination). The address to send to should have been
9445 	 * selected/changed where the retransmission was marked (i.e. in FR
9446 	 * or t3-timeout routines).
9447 	 */
9448 	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9449 	struct sctp_tmit_chunk *chk, *fwd;
9450 	struct mbuf *m, *endofchain;
9451 	struct sctp_nets *net = NULL;
9452 	uint32_t tsns_sent = 0;
9453 	int no_fragmentflg, bundle_at, cnt_thru;
9454 	unsigned int mtu;
9455 	int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9456 	struct sctp_auth_chunk *auth = NULL;
9457 	uint32_t auth_offset = 0;
9458 	uint16_t auth_keyid;
9459 	int override_ok = 1;
9460 	int data_auth_reqd = 0;
9461 	uint32_t dmtu = 0;
9462 
9463 	SCTP_TCB_LOCK_ASSERT(stcb);
9464 	tmr_started = ctl_cnt = bundle_at = error = 0;
9465 	no_fragmentflg = 1;
9466 	fwd_tsn = 0;
9467 	*cnt_out = 0;
9468 	fwd = NULL;
9469 	endofchain = m = NULL;
9470 	auth_keyid = stcb->asoc.authinfo.active_keyid;
9471 #ifdef SCTP_AUDITING_ENABLED
9472 	sctp_audit_log(0xC3, 1);
9473 #endif
9474 	if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9475 	    (TAILQ_EMPTY(&asoc->control_send_queue))) {
9476 		SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9477 		    asoc->sent_queue_retran_cnt);
9478 		asoc->sent_queue_cnt = 0;
9479 		asoc->sent_queue_cnt_removeable = 0;
9480 		/* send back 0/0 so we enter normal transmission */
9481 		*cnt_out = 0;
9482 		return (0);
9483 	}
9484 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9485 		if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9486 		    (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9487 		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9488 			if (chk->sent != SCTP_DATAGRAM_RESEND) {
9489 				continue;
9490 			}
9491 			if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9492 				if (chk != asoc->str_reset) {
9493 					/*
9494 					 * not eligible for retran if its
9495 					 * not ours
9496 					 */
9497 					continue;
9498 				}
9499 			}
9500 			ctl_cnt++;
9501 			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9502 				fwd_tsn = 1;
9503 			}
9504 			/*
9505 			 * Add an AUTH chunk, if chunk requires it save the
9506 			 * offset into the chain for AUTH
9507 			 */
9508 			if ((auth == NULL) &&
9509 			    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9510 			    stcb->asoc.peer_auth_chunks))) {
9511 				m = sctp_add_auth_chunk(m, &endofchain,
9512 				    &auth, &auth_offset,
9513 				    stcb,
9514 				    chk->rec.chunk_id.id);
9515 				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9516 			}
9517 			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9518 			break;
9519 		}
9520 	}
9521 	one_chunk = 0;
9522 	cnt_thru = 0;
9523 	/* do we have control chunks to retransmit? */
9524 	if (m != NULL) {
9525 		/* Start a timer no matter if we succeed or fail */
9526 		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9527 			sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9528 		} else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9529 			sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9530 		chk->snd_count++;	/* update our count */
9531 		if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9532 		    (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9533 		    auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9534 		    no_fragmentflg, 0, 0,
9535 		    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9536 		    chk->whoTo->port, NULL,
9537 		    0, 0,
9538 		    so_locked))) {
9539 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9540 			if (error == ENOBUFS) {
9541 				asoc->ifp_had_enobuf = 1;
9542 				SCTP_STAT_INCR(sctps_lowlevelerr);
9543 			}
9544 			return (error);
9545 		} else {
9546 			asoc->ifp_had_enobuf = 0;
9547 		}
9548 		endofchain = NULL;
9549 		auth = NULL;
9550 		auth_offset = 0;
9551 		/*
9552 		 * We don't want to mark the net->sent time here since this
9553 		 * we use this for HB and retrans cannot measure RTT
9554 		 */
9555 		/* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9556 		*cnt_out += 1;
9557 		chk->sent = SCTP_DATAGRAM_SENT;
9558 		sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9559 		if (fwd_tsn == 0) {
9560 			return (0);
9561 		} else {
9562 			/* Clean up the fwd-tsn list */
9563 			sctp_clean_up_ctl(stcb, asoc, so_locked);
9564 			return (0);
9565 		}
9566 	}
9567 	/*
9568 	 * Ok, it is just data retransmission we need to do or that and a
9569 	 * fwd-tsn with it all.
9570 	 */
9571 	if (TAILQ_EMPTY(&asoc->sent_queue)) {
9572 		return (SCTP_RETRAN_DONE);
9573 	}
9574 	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9575 	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9576 		/* not yet open, resend the cookie and that is it */
9577 		return (1);
9578 	}
9579 #ifdef SCTP_AUDITING_ENABLED
9580 	sctp_auditing(20, inp, stcb, NULL);
9581 #endif
9582 	data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9583 	TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9584 		if (chk->sent != SCTP_DATAGRAM_RESEND) {
9585 			/* No, not sent to this net or not ready for rtx */
9586 			continue;
9587 		}
9588 		if (chk->data == NULL) {
9589 			SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9590 			    chk->rec.data.tsn, chk->snd_count, chk->sent);
9591 			continue;
9592 		}
9593 		if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9594 		    (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9595 			struct mbuf *op_err;
9596 			char msg[SCTP_DIAG_INFO_LEN];
9597 
9598 			snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
9599 			    chk->rec.data.tsn, chk->snd_count);
9600 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
9601 			    msg);
9602 			atomic_add_int(&stcb->asoc.refcnt, 1);
9603 			sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
9604 			    so_locked);
9605 			SCTP_TCB_LOCK(stcb);
9606 			atomic_subtract_int(&stcb->asoc.refcnt, 1);
9607 			return (SCTP_RETRAN_EXIT);
9608 		}
9609 		/* pick up the net */
9610 		net = chk->whoTo;
9611 		switch (net->ro._l_addr.sa.sa_family) {
9612 #ifdef INET
9613 		case AF_INET:
9614 			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9615 			break;
9616 #endif
9617 #ifdef INET6
9618 		case AF_INET6:
9619 			mtu = net->mtu - SCTP_MIN_OVERHEAD;
9620 			break;
9621 #endif
9622 		default:
9623 			/* TSNH */
9624 			mtu = net->mtu;
9625 			break;
9626 		}
9627 
9628 		if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9629 			/* No room in peers rwnd */
9630 			uint32_t tsn;
9631 
9632 			tsn = asoc->last_acked_seq + 1;
9633 			if (tsn == chk->rec.data.tsn) {
9634 				/*
9635 				 * we make a special exception for this
9636 				 * case. The peer has no rwnd but is missing
9637 				 * the lowest chunk.. which is probably what
9638 				 * is holding up the rwnd.
9639 				 */
9640 				goto one_chunk_around;
9641 			}
9642 			return (1);
9643 		}
9644 one_chunk_around:
9645 		if (asoc->peers_rwnd < mtu) {
9646 			one_chunk = 1;
9647 			if ((asoc->peers_rwnd == 0) &&
9648 			    (asoc->total_flight == 0)) {
9649 				chk->window_probe = 1;
9650 				chk->whoTo->window_probe = 1;
9651 			}
9652 		}
9653 #ifdef SCTP_AUDITING_ENABLED
9654 		sctp_audit_log(0xC3, 2);
9655 #endif
9656 		bundle_at = 0;
9657 		m = NULL;
9658 		net->fast_retran_ip = 0;
9659 		if (chk->rec.data.doing_fast_retransmit == 0) {
9660 			/*
9661 			 * if no FR in progress skip destination that have
9662 			 * flight_size > cwnd.
9663 			 */
9664 			if (net->flight_size >= net->cwnd) {
9665 				continue;
9666 			}
9667 		} else {
9668 			/*
9669 			 * Mark the destination net to have FR recovery
9670 			 * limits put on it.
9671 			 */
9672 			*fr_done = 1;
9673 			net->fast_retran_ip = 1;
9674 		}
9675 
9676 		/*
9677 		 * if no AUTH is yet included and this chunk requires it,
9678 		 * make sure to account for it.  We don't apply the size
9679 		 * until the AUTH chunk is actually added below in case
9680 		 * there is no room for this chunk.
9681 		 */
9682 		if (data_auth_reqd && (auth == NULL)) {
9683 			dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9684 		} else
9685 			dmtu = 0;
9686 
9687 		if ((chk->send_size <= (mtu - dmtu)) ||
9688 		    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9689 			/* ok we will add this one */
9690 			if (data_auth_reqd) {
9691 				if (auth == NULL) {
9692 					m = sctp_add_auth_chunk(m,
9693 					    &endofchain,
9694 					    &auth,
9695 					    &auth_offset,
9696 					    stcb,
9697 					    SCTP_DATA);
9698 					auth_keyid = chk->auth_keyid;
9699 					override_ok = 0;
9700 					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9701 				} else if (override_ok) {
9702 					auth_keyid = chk->auth_keyid;
9703 					override_ok = 0;
9704 				} else if (chk->auth_keyid != auth_keyid) {
9705 					/* different keyid, so done bundling */
9706 					break;
9707 				}
9708 			}
9709 			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9710 			if (m == NULL) {
9711 				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9712 				return (ENOMEM);
9713 			}
9714 			/* Do clear IP_DF ? */
9715 			if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9716 				no_fragmentflg = 0;
9717 			}
9718 			/* upate our MTU size */
9719 			if (mtu > (chk->send_size + dmtu))
9720 				mtu -= (chk->send_size + dmtu);
9721 			else
9722 				mtu = 0;
9723 			data_list[bundle_at++] = chk;
9724 			if (one_chunk && (asoc->total_flight <= 0)) {
9725 				SCTP_STAT_INCR(sctps_windowprobed);
9726 			}
9727 		}
9728 		if (one_chunk == 0) {
9729 			/*
9730 			 * now are there anymore forward from chk to pick
9731 			 * up?
9732 			 */
9733 			for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9734 				if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9735 					/* Nope, not for retran */
9736 					continue;
9737 				}
9738 				if (fwd->whoTo != net) {
9739 					/* Nope, not the net in question */
9740 					continue;
9741 				}
9742 				if (data_auth_reqd && (auth == NULL)) {
9743 					dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9744 				} else
9745 					dmtu = 0;
9746 				if (fwd->send_size <= (mtu - dmtu)) {
9747 					if (data_auth_reqd) {
9748 						if (auth == NULL) {
9749 							m = sctp_add_auth_chunk(m,
9750 							    &endofchain,
9751 							    &auth,
9752 							    &auth_offset,
9753 							    stcb,
9754 							    SCTP_DATA);
9755 							auth_keyid = fwd->auth_keyid;
9756 							override_ok = 0;
9757 							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9758 						} else if (override_ok) {
9759 							auth_keyid = fwd->auth_keyid;
9760 							override_ok = 0;
9761 						} else if (fwd->auth_keyid != auth_keyid) {
9762 							/*
9763 							 * different keyid,
9764 							 * so done bundling
9765 							 */
9766 							break;
9767 						}
9768 					}
9769 					m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9770 					if (m == NULL) {
9771 						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9772 						return (ENOMEM);
9773 					}
9774 					/* Do clear IP_DF ? */
9775 					if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9776 						no_fragmentflg = 0;
9777 					}
9778 					/* upate our MTU size */
9779 					if (mtu > (fwd->send_size + dmtu))
9780 						mtu -= (fwd->send_size + dmtu);
9781 					else
9782 						mtu = 0;
9783 					data_list[bundle_at++] = fwd;
9784 					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9785 						break;
9786 					}
9787 				} else {
9788 					/* can't fit so we are done */
9789 					break;
9790 				}
9791 			}
9792 		}
9793 		/* Is there something to send for this destination? */
9794 		if (m) {
9795 			/*
9796 			 * No matter if we fail/or succeed we should start a
9797 			 * timer. A failure is like a lost IP packet :-)
9798 			 */
9799 			if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9800 				/*
9801 				 * no timer running on this destination
9802 				 * restart it.
9803 				 */
9804 				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9805 				tmr_started = 1;
9806 			}
9807 			/* Now lets send it, if there is anything to send :> */
9808 			if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9809 			    (struct sockaddr *)&net->ro._l_addr, m,
9810 			    auth_offset, auth, auth_keyid,
9811 			    no_fragmentflg, 0, 0,
9812 			    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9813 			    net->port, NULL,
9814 			    0, 0,
9815 			    so_locked))) {
9816 				/* error, we could not output */
9817 				SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
9818 				if (error == ENOBUFS) {
9819 					asoc->ifp_had_enobuf = 1;
9820 					SCTP_STAT_INCR(sctps_lowlevelerr);
9821 				}
9822 				return (error);
9823 			} else {
9824 				asoc->ifp_had_enobuf = 0;
9825 			}
9826 			endofchain = NULL;
9827 			auth = NULL;
9828 			auth_offset = 0;
9829 			/* For HB's */
9830 			/*
9831 			 * We don't want to mark the net->sent time here
9832 			 * since this we use this for HB and retrans cannot
9833 			 * measure RTT
9834 			 */
9835 			/* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9836 
9837 			/* For auto-close */
9838 			cnt_thru++;
9839 			if (*now_filled == 0) {
9840 				(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9841 				*now = asoc->time_last_sent;
9842 				*now_filled = 1;
9843 			} else {
9844 				asoc->time_last_sent = *now;
9845 			}
9846 			*cnt_out += bundle_at;
9847 #ifdef SCTP_AUDITING_ENABLED
9848 			sctp_audit_log(0xC4, bundle_at);
9849 #endif
9850 			if (bundle_at) {
9851 				tsns_sent = data_list[0]->rec.data.tsn;
9852 			}
9853 			for (i = 0; i < bundle_at; i++) {
9854 				SCTP_STAT_INCR(sctps_sendretransdata);
9855 				data_list[i]->sent = SCTP_DATAGRAM_SENT;
9856 				/*
9857 				 * When we have a revoked data, and we
9858 				 * retransmit it, then we clear the revoked
9859 				 * flag since this flag dictates if we
9860 				 * subtracted from the fs
9861 				 */
9862 				if (data_list[i]->rec.data.chunk_was_revoked) {
9863 					/* Deflate the cwnd */
9864 					data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9865 					data_list[i]->rec.data.chunk_was_revoked = 0;
9866 				}
9867 				data_list[i]->snd_count++;
9868 				sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9869 				/* record the time */
9870 				data_list[i]->sent_rcv_time = asoc->time_last_sent;
9871 				if (data_list[i]->book_size_scale) {
9872 					/*
9873 					 * need to double the book size on
9874 					 * this one
9875 					 */
9876 					data_list[i]->book_size_scale = 0;
9877 					/*
9878 					 * Since we double the booksize, we
9879 					 * must also double the output queue
9880 					 * size, since this get shrunk when
9881 					 * we free by this amount.
9882 					 */
9883 					atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9884 					data_list[i]->book_size *= 2;
9885 
9886 
9887 				} else {
9888 					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9889 						sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9890 						    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9891 					}
9892 					asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9893 					    (uint32_t)(data_list[i]->send_size +
9894 					    SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9895 				}
9896 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9897 					sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9898 					    data_list[i]->whoTo->flight_size,
9899 					    data_list[i]->book_size,
9900 					    (uint32_t)(uintptr_t)data_list[i]->whoTo,
9901 					    data_list[i]->rec.data.tsn);
9902 				}
9903 				sctp_flight_size_increase(data_list[i]);
9904 				sctp_total_flight_increase(stcb, data_list[i]);
9905 				if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9906 					/* SWS sender side engages */
9907 					asoc->peers_rwnd = 0;
9908 				}
9909 				if ((i == 0) &&
9910 				    (data_list[i]->rec.data.doing_fast_retransmit)) {
9911 					SCTP_STAT_INCR(sctps_sendfastretrans);
9912 					if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9913 					    (tmr_started == 0)) {
9914 						/*-
9915 						 * ok we just fast-retrans'd
9916 						 * the lowest TSN, i.e the
9917 						 * first on the list. In
9918 						 * this case we want to give
9919 						 * some more time to get a
9920 						 * SACK back without a
9921 						 * t3-expiring.
9922 						 */
9923 						sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9924 						    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
9925 						sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9926 					}
9927 				}
9928 			}
9929 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9930 				sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9931 			}
9932 #ifdef SCTP_AUDITING_ENABLED
9933 			sctp_auditing(21, inp, stcb, NULL);
9934 #endif
9935 		} else {
9936 			/* None will fit */
9937 			return (1);
9938 		}
9939 		if (asoc->sent_queue_retran_cnt <= 0) {
9940 			/* all done we have no more to retran */
9941 			asoc->sent_queue_retran_cnt = 0;
9942 			break;
9943 		}
9944 		if (one_chunk) {
9945 			/* No more room in rwnd */
9946 			return (1);
9947 		}
9948 		/* stop the for loop here. we sent out a packet */
9949 		break;
9950 	}
9951 	return (0);
9952 }
9953 
9954 static void
9955 sctp_timer_validation(struct sctp_inpcb *inp,
9956     struct sctp_tcb *stcb,
9957     struct sctp_association *asoc)
9958 {
9959 	struct sctp_nets *net;
9960 
9961 	/* Validate that a timer is running somewhere */
9962 	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9963 		if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9964 			/* Here is a timer */
9965 			return;
9966 		}
9967 	}
9968 	SCTP_TCB_LOCK_ASSERT(stcb);
9969 	/* Gak, we did not have a timer somewhere */
9970 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9971 	if (asoc->alternate) {
9972 		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9973 	} else {
9974 		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9975 	}
9976 	return;
9977 }
9978 
9979 void
9980 sctp_chunk_output(struct sctp_inpcb *inp,
9981     struct sctp_tcb *stcb,
9982     int from_where,
9983     int so_locked
9984 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9985     SCTP_UNUSED
9986 #endif
9987 )
9988 {
9989 	/*-
9990 	 * Ok this is the generic chunk service queue. we must do the
9991 	 * following:
9992 	 * - See if there are retransmits pending, if so we must
9993 	 *   do these first.
9994 	 * - Service the stream queue that is next, moving any
9995 	 *   message (note I must get a complete message i.e.
9996 	 *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9997 	 *   TSN's
9998 	 * - Check to see if the cwnd/rwnd allows any output, if so we
9999 	 *   go ahead and fomulate and send the low level chunks. Making sure
10000 	 *   to combine any control in the control chunk queue also.
10001 	 */
10002 	struct sctp_association *asoc;
10003 	struct sctp_nets *net;
10004 	int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
10005 	unsigned int burst_cnt = 0;
10006 	struct timeval now;
10007 	int now_filled = 0;
10008 	int nagle_on;
10009 	int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10010 	int un_sent = 0;
10011 	int fr_done;
10012 	unsigned int tot_frs = 0;
10013 
10014 	asoc = &stcb->asoc;
10015 do_it_again:
10016 	/* The Nagle algorithm is only applied when handling a send call. */
10017 	if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10018 		if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10019 			nagle_on = 0;
10020 		} else {
10021 			nagle_on = 1;
10022 		}
10023 	} else {
10024 		nagle_on = 0;
10025 	}
10026 	SCTP_TCB_LOCK_ASSERT(stcb);
10027 
10028 	un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10029 
10030 	if ((un_sent <= 0) &&
10031 	    (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10032 	    (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10033 	    (asoc->sent_queue_retran_cnt == 0) &&
10034 	    (asoc->trigger_reset == 0)) {
10035 		/* Nothing to do unless there is something to be sent left */
10036 		return;
10037 	}
10038 	/*
10039 	 * Do we have something to send, data or control AND a sack timer
10040 	 * running, if so piggy-back the sack.
10041 	 */
10042 	if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10043 		sctp_send_sack(stcb, so_locked);
10044 		(void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10045 	}
10046 	while (asoc->sent_queue_retran_cnt) {
10047 		/*-
10048 		 * Ok, it is retransmission time only, we send out only ONE
10049 		 * packet with a single call off to the retran code.
10050 		 */
10051 		if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10052 			/*-
10053 			 * Special hook for handling cookiess discarded
10054 			 * by peer that carried data. Send cookie-ack only
10055 			 * and then the next call with get the retran's.
10056 			 */
10057 			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10058 			    from_where,
10059 			    &now, &now_filled, frag_point, so_locked);
10060 			return;
10061 		} else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10062 			/* if its not from a HB then do it */
10063 			fr_done = 0;
10064 			ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10065 			if (fr_done) {
10066 				tot_frs++;
10067 			}
10068 		} else {
10069 			/*
10070 			 * its from any other place, we don't allow retran
10071 			 * output (only control)
10072 			 */
10073 			ret = 1;
10074 		}
10075 		if (ret > 0) {
10076 			/* Can't send anymore */
10077 			/*-
10078 			 * now lets push out control by calling med-level
10079 			 * output once. this assures that we WILL send HB's
10080 			 * if queued too.
10081 			 */
10082 			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10083 			    from_where,
10084 			    &now, &now_filled, frag_point, so_locked);
10085 #ifdef SCTP_AUDITING_ENABLED
10086 			sctp_auditing(8, inp, stcb, NULL);
10087 #endif
10088 			sctp_timer_validation(inp, stcb, asoc);
10089 			return;
10090 		}
10091 		if (ret < 0) {
10092 			/*-
10093 			 * The count was off.. retran is not happening so do
10094 			 * the normal retransmission.
10095 			 */
10096 #ifdef SCTP_AUDITING_ENABLED
10097 			sctp_auditing(9, inp, stcb, NULL);
10098 #endif
10099 			if (ret == SCTP_RETRAN_EXIT) {
10100 				return;
10101 			}
10102 			break;
10103 		}
10104 		if (from_where == SCTP_OUTPUT_FROM_T3) {
10105 			/* Only one transmission allowed out of a timeout */
10106 #ifdef SCTP_AUDITING_ENABLED
10107 			sctp_auditing(10, inp, stcb, NULL);
10108 #endif
10109 			/* Push out any control */
10110 			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10111 			    &now, &now_filled, frag_point, so_locked);
10112 			return;
10113 		}
10114 		if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10115 			/* Hit FR burst limit */
10116 			return;
10117 		}
10118 		if ((num_out == 0) && (ret == 0)) {
10119 			/* No more retrans to send */
10120 			break;
10121 		}
10122 	}
10123 #ifdef SCTP_AUDITING_ENABLED
10124 	sctp_auditing(12, inp, stcb, NULL);
10125 #endif
10126 	/* Check for bad destinations, if they exist move chunks around. */
10127 	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10128 		if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10129 			/*-
10130 			 * if possible move things off of this address we
10131 			 * still may send below due to the dormant state but
10132 			 * we try to find an alternate address to send to
10133 			 * and if we have one we move all queued data on the
10134 			 * out wheel to this alternate address.
10135 			 */
10136 			if (net->ref_count > 1)
10137 				sctp_move_chunks_from_net(stcb, net);
10138 		} else {
10139 			/*-
10140 			 * if ((asoc->sat_network) || (net->addr_is_local))
10141 			 * { burst_limit = asoc->max_burst *
10142 			 * SCTP_SAT_NETWORK_BURST_INCR; }
10143 			 */
10144 			if (asoc->max_burst > 0) {
10145 				if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10146 					if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10147 						/*
10148 						 * JRS - Use the congestion
10149 						 * control given in the
10150 						 * congestion control module
10151 						 */
10152 						asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10153 						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10154 							sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10155 						}
10156 						SCTP_STAT_INCR(sctps_maxburstqueued);
10157 					}
10158 					net->fast_retran_ip = 0;
10159 				} else {
10160 					if (net->flight_size == 0) {
10161 						/*
10162 						 * Should be decaying the
10163 						 * cwnd here
10164 						 */
10165 						;
10166 					}
10167 				}
10168 			}
10169 		}
10170 
10171 	}
10172 	burst_cnt = 0;
10173 	do {
10174 		error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10175 		    &reason_code, 0, from_where,
10176 		    &now, &now_filled, frag_point, so_locked);
10177 		if (error) {
10178 			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10179 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10180 				sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10181 			}
10182 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10183 				sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10184 				sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10185 			}
10186 			break;
10187 		}
10188 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10189 
10190 		tot_out += num_out;
10191 		burst_cnt++;
10192 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10193 			sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10194 			if (num_out == 0) {
10195 				sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10196 			}
10197 		}
10198 		if (nagle_on) {
10199 			/*
10200 			 * When the Nagle algorithm is used, look at how
10201 			 * much is unsent, then if its smaller than an MTU
10202 			 * and we have data in flight we stop, except if we
10203 			 * are handling a fragmented user message.
10204 			 */
10205 			un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10206 			    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10207 			if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10208 			    (stcb->asoc.total_flight > 0)) {
10209 /*	&&		     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10210 				break;
10211 			}
10212 		}
10213 		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10214 		    TAILQ_EMPTY(&asoc->send_queue) &&
10215 		    sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10216 			/* Nothing left to send */
10217 			break;
10218 		}
10219 		if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10220 			/* Nothing left to send */
10221 			break;
10222 		}
10223 	} while (num_out &&
10224 	    ((asoc->max_burst == 0) ||
10225 	    SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10226 	    (burst_cnt < asoc->max_burst)));
10227 
10228 	if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10229 		if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10230 			SCTP_STAT_INCR(sctps_maxburstqueued);
10231 			asoc->burst_limit_applied = 1;
10232 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10233 				sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10234 			}
10235 		} else {
10236 			asoc->burst_limit_applied = 0;
10237 		}
10238 	}
10239 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10240 		sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10241 	}
10242 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10243 	    tot_out);
10244 
10245 	/*-
10246 	 * Now we need to clean up the control chunk chain if a ECNE is on
10247 	 * it. It must be marked as UNSENT again so next call will continue
10248 	 * to send it until such time that we get a CWR, to remove it.
10249 	 */
10250 	if (stcb->asoc.ecn_echo_cnt_onq)
10251 		sctp_fix_ecn_echo(asoc);
10252 
10253 	if (stcb->asoc.trigger_reset) {
10254 		if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10255 			goto do_it_again;
10256 		}
10257 	}
10258 	return;
10259 }
10260 
10261 
10262 int
10263 sctp_output(
10264     struct sctp_inpcb *inp,
10265     struct mbuf *m,
10266     struct sockaddr *addr,
10267     struct mbuf *control,
10268     struct thread *p,
10269     int flags)
10270 {
10271 	if (inp == NULL) {
10272 		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10273 		return (EINVAL);
10274 	}
10275 	if (inp->sctp_socket == NULL) {
10276 		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10277 		return (EINVAL);
10278 	}
10279 	return (sctp_sosend(inp->sctp_socket,
10280 	    addr,
10281 	    (struct uio *)NULL,
10282 	    m,
10283 	    control,
10284 	    flags, p
10285 	    ));
10286 }
10287 
10288 void
10289 send_forward_tsn(struct sctp_tcb *stcb,
10290     struct sctp_association *asoc)
10291 {
10292 	struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10293 	struct sctp_forward_tsn_chunk *fwdtsn;
10294 	struct sctp_strseq *strseq;
10295 	struct sctp_strseq_mid *strseq_m;
10296 	uint32_t advance_peer_ack_point;
10297 	unsigned int cnt_of_space, i, ovh;
10298 	unsigned int space_needed;
10299 	unsigned int cnt_of_skipped = 0;
10300 
10301 	SCTP_TCB_LOCK_ASSERT(stcb);
10302 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10303 		if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10304 			/* mark it to unsent */
10305 			chk->sent = SCTP_DATAGRAM_UNSENT;
10306 			chk->snd_count = 0;
10307 			/* Do we correct its output location? */
10308 			if (chk->whoTo) {
10309 				sctp_free_remote_addr(chk->whoTo);
10310 				chk->whoTo = NULL;
10311 			}
10312 			goto sctp_fill_in_rest;
10313 		}
10314 	}
10315 	/* Ok if we reach here we must build one */
10316 	sctp_alloc_a_chunk(stcb, chk);
10317 	if (chk == NULL) {
10318 		return;
10319 	}
10320 	asoc->fwd_tsn_cnt++;
10321 	chk->copy_by_ref = 0;
10322 	/*
10323 	 * We don't do the old thing here since this is used not for on-wire
10324 	 * but to tell if we are sending a fwd-tsn by the stack during
10325 	 * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10326 	 */
10327 	chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10328 	chk->rec.chunk_id.can_take_data = 0;
10329 	chk->flags = 0;
10330 	chk->asoc = asoc;
10331 	chk->whoTo = NULL;
10332 	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10333 	if (chk->data == NULL) {
10334 		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10335 		return;
10336 	}
10337 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10338 	chk->sent = SCTP_DATAGRAM_UNSENT;
10339 	chk->snd_count = 0;
10340 	TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10341 	asoc->ctrl_queue_cnt++;
10342 sctp_fill_in_rest:
10343 	/*-
10344 	 * Here we go through and fill out the part that deals with
10345 	 * stream/seq of the ones we skip.
10346 	 */
10347 	SCTP_BUF_LEN(chk->data) = 0;
10348 	TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10349 		if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10350 		    (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10351 			/* no more to look at */
10352 			break;
10353 		}
10354 		if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10355 			/* We don't report these */
10356 			continue;
10357 		}
10358 		cnt_of_skipped++;
10359 	}
10360 	if (asoc->idata_supported) {
10361 		space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10362 		    (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10363 	} else {
10364 		space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10365 		    (cnt_of_skipped * sizeof(struct sctp_strseq)));
10366 	}
10367 	cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10368 
10369 	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10370 		ovh = SCTP_MIN_OVERHEAD;
10371 	} else {
10372 		ovh = SCTP_MIN_V4_OVERHEAD;
10373 	}
10374 	if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10375 		/* trim to a mtu size */
10376 		cnt_of_space = asoc->smallest_mtu - ovh;
10377 	}
10378 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10379 		sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10380 		    0xff, 0, cnt_of_skipped,
10381 		    asoc->advanced_peer_ack_point);
10382 	}
10383 	advance_peer_ack_point = asoc->advanced_peer_ack_point;
10384 	if (cnt_of_space < space_needed) {
10385 		/*-
10386 		 * ok we must trim down the chunk by lowering the
10387 		 * advance peer ack point.
10388 		 */
10389 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10390 			sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10391 			    0xff, 0xff, cnt_of_space,
10392 			    space_needed);
10393 		}
10394 		cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10395 		if (asoc->idata_supported) {
10396 			cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10397 		} else {
10398 			cnt_of_skipped /= sizeof(struct sctp_strseq);
10399 		}
10400 		/*-
10401 		 * Go through and find the TSN that will be the one
10402 		 * we report.
10403 		 */
10404 		at = TAILQ_FIRST(&asoc->sent_queue);
10405 		if (at != NULL) {
10406 			for (i = 0; i < cnt_of_skipped; i++) {
10407 				tp1 = TAILQ_NEXT(at, sctp_next);
10408 				if (tp1 == NULL) {
10409 					break;
10410 				}
10411 				at = tp1;
10412 			}
10413 		}
10414 		if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10415 			sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10416 			    0xff, cnt_of_skipped, at->rec.data.tsn,
10417 			    asoc->advanced_peer_ack_point);
10418 		}
10419 		last = at;
10420 		/*-
10421 		 * last now points to last one I can report, update
10422 		 * peer ack point
10423 		 */
10424 		if (last) {
10425 			advance_peer_ack_point = last->rec.data.tsn;
10426 		}
10427 		if (asoc->idata_supported) {
10428 			space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10429 			    cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10430 		} else {
10431 			space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10432 			    cnt_of_skipped * sizeof(struct sctp_strseq);
10433 		}
10434 	}
10435 	chk->send_size = space_needed;
10436 	/* Setup the chunk */
10437 	fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10438 	fwdtsn->ch.chunk_length = htons(chk->send_size);
10439 	fwdtsn->ch.chunk_flags = 0;
10440 	if (asoc->idata_supported) {
10441 		fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10442 	} else {
10443 		fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10444 	}
10445 	fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10446 	SCTP_BUF_LEN(chk->data) = chk->send_size;
10447 	fwdtsn++;
10448 	/*-
10449 	 * Move pointer to after the fwdtsn and transfer to the
10450 	 * strseq pointer.
10451 	 */
10452 	if (asoc->idata_supported) {
10453 		strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10454 		strseq = NULL;
10455 	} else {
10456 		strseq = (struct sctp_strseq *)fwdtsn;
10457 		strseq_m = NULL;
10458 	}
10459 	/*-
10460 	 * Now populate the strseq list. This is done blindly
10461 	 * without pulling out duplicate stream info. This is
10462 	 * inefficent but won't harm the process since the peer will
10463 	 * look at these in sequence and will thus release anything.
10464 	 * It could mean we exceed the PMTU and chop off some that
10465 	 * we could have included.. but this is unlikely (aka 1432/4
10466 	 * would mean 300+ stream seq's would have to be reported in
10467 	 * one FWD-TSN. With a bit of work we can later FIX this to
10468 	 * optimize and pull out duplicates.. but it does add more
10469 	 * overhead. So for now... not!
10470 	 */
10471 	i = 0;
10472 	TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10473 		if (i >= cnt_of_skipped) {
10474 			break;
10475 		}
10476 		if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10477 			/* We don't report these */
10478 			continue;
10479 		}
10480 		if (at->rec.data.tsn == advance_peer_ack_point) {
10481 			at->rec.data.fwd_tsn_cnt = 0;
10482 		}
10483 		if (asoc->idata_supported) {
10484 			strseq_m->sid = htons(at->rec.data.sid);
10485 			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10486 				strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10487 			} else {
10488 				strseq_m->flags = 0;
10489 			}
10490 			strseq_m->mid = htonl(at->rec.data.mid);
10491 			strseq_m++;
10492 		} else {
10493 			strseq->sid = htons(at->rec.data.sid);
10494 			strseq->ssn = htons((uint16_t)at->rec.data.mid);
10495 			strseq++;
10496 		}
10497 		i++;
10498 	}
10499 	return;
10500 }
10501 
10502 void
10503 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10504 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10505     SCTP_UNUSED
10506 #endif
10507 )
10508 {
10509 	/*-
10510 	 * Queue up a SACK or NR-SACK in the control queue.
10511 	 * We must first check to see if a SACK or NR-SACK is
10512 	 * somehow on the control queue.
10513 	 * If so, we will take and and remove the old one.
10514 	 */
10515 	struct sctp_association *asoc;
10516 	struct sctp_tmit_chunk *chk, *a_chk;
10517 	struct sctp_sack_chunk *sack;
10518 	struct sctp_nr_sack_chunk *nr_sack;
10519 	struct sctp_gap_ack_block *gap_descriptor;
10520 	const struct sack_track *selector;
10521 	int mergeable = 0;
10522 	int offset;
10523 	caddr_t limit;
10524 	uint32_t *dup;
10525 	int limit_reached = 0;
10526 	unsigned int i, siz, j;
10527 	unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10528 	int num_dups = 0;
10529 	int space_req;
10530 	uint32_t highest_tsn;
10531 	uint8_t flags;
10532 	uint8_t type;
10533 	uint8_t tsn_map;
10534 
10535 	if (stcb->asoc.nrsack_supported == 1) {
10536 		type = SCTP_NR_SELECTIVE_ACK;
10537 	} else {
10538 		type = SCTP_SELECTIVE_ACK;
10539 	}
10540 	a_chk = NULL;
10541 	asoc = &stcb->asoc;
10542 	SCTP_TCB_LOCK_ASSERT(stcb);
10543 	if (asoc->last_data_chunk_from == NULL) {
10544 		/* Hmm we never received anything */
10545 		return;
10546 	}
10547 	sctp_slide_mapping_arrays(stcb);
10548 	sctp_set_rwnd(stcb, asoc);
10549 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10550 		if (chk->rec.chunk_id.id == type) {
10551 			/* Hmm, found a sack already on queue, remove it */
10552 			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10553 			asoc->ctrl_queue_cnt--;
10554 			a_chk = chk;
10555 			if (a_chk->data) {
10556 				sctp_m_freem(a_chk->data);
10557 				a_chk->data = NULL;
10558 			}
10559 			if (a_chk->whoTo) {
10560 				sctp_free_remote_addr(a_chk->whoTo);
10561 				a_chk->whoTo = NULL;
10562 			}
10563 			break;
10564 		}
10565 	}
10566 	if (a_chk == NULL) {
10567 		sctp_alloc_a_chunk(stcb, a_chk);
10568 		if (a_chk == NULL) {
10569 			/* No memory so we drop the idea, and set a timer */
10570 			if (stcb->asoc.delayed_ack) {
10571 				sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10572 				    stcb->sctp_ep, stcb, NULL,
10573 				    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10574 				sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10575 				    stcb->sctp_ep, stcb, NULL);
10576 			} else {
10577 				stcb->asoc.send_sack = 1;
10578 			}
10579 			return;
10580 		}
10581 		a_chk->copy_by_ref = 0;
10582 		a_chk->rec.chunk_id.id = type;
10583 		a_chk->rec.chunk_id.can_take_data = 1;
10584 	}
10585 	/* Clear our pkt counts */
10586 	asoc->data_pkts_seen = 0;
10587 
10588 	a_chk->flags = 0;
10589 	a_chk->asoc = asoc;
10590 	a_chk->snd_count = 0;
10591 	a_chk->send_size = 0;	/* fill in later */
10592 	a_chk->sent = SCTP_DATAGRAM_UNSENT;
10593 	a_chk->whoTo = NULL;
10594 
10595 	if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10596 		/*-
10597 		 * Ok, the destination for the SACK is unreachable, lets see if
10598 		 * we can select an alternate to asoc->last_data_chunk_from
10599 		 */
10600 		a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10601 		if (a_chk->whoTo == NULL) {
10602 			/* Nope, no alternate */
10603 			a_chk->whoTo = asoc->last_data_chunk_from;
10604 		}
10605 	} else {
10606 		a_chk->whoTo = asoc->last_data_chunk_from;
10607 	}
10608 	if (a_chk->whoTo) {
10609 		atomic_add_int(&a_chk->whoTo->ref_count, 1);
10610 	}
10611 	if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10612 		highest_tsn = asoc->highest_tsn_inside_map;
10613 	} else {
10614 		highest_tsn = asoc->highest_tsn_inside_nr_map;
10615 	}
10616 	if (highest_tsn == asoc->cumulative_tsn) {
10617 		/* no gaps */
10618 		if (type == SCTP_SELECTIVE_ACK) {
10619 			space_req = sizeof(struct sctp_sack_chunk);
10620 		} else {
10621 			space_req = sizeof(struct sctp_nr_sack_chunk);
10622 		}
10623 	} else {
10624 		/* gaps get a cluster */
10625 		space_req = MCLBYTES;
10626 	}
10627 	/* Ok now lets formulate a MBUF with our sack */
10628 	a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10629 	if ((a_chk->data == NULL) ||
10630 	    (a_chk->whoTo == NULL)) {
10631 		/* rats, no mbuf memory */
10632 		if (a_chk->data) {
10633 			/* was a problem with the destination */
10634 			sctp_m_freem(a_chk->data);
10635 			a_chk->data = NULL;
10636 		}
10637 		sctp_free_a_chunk(stcb, a_chk, so_locked);
10638 		/* sa_ignore NO_NULL_CHK */
10639 		if (stcb->asoc.delayed_ack) {
10640 			sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10641 			    stcb->sctp_ep, stcb, NULL,
10642 			    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10643 			sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10644 			    stcb->sctp_ep, stcb, NULL);
10645 		} else {
10646 			stcb->asoc.send_sack = 1;
10647 		}
10648 		return;
10649 	}
10650 	/* ok, lets go through and fill it in */
10651 	SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10652 	space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10653 	if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10654 		space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10655 	}
10656 	limit = mtod(a_chk->data, caddr_t);
10657 	limit += space;
10658 
10659 	flags = 0;
10660 
10661 	if ((asoc->sctp_cmt_on_off > 0) &&
10662 	    SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10663 		/*-
10664 		 * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10665 		 * received, then set high bit to 1, else 0. Reset
10666 		 * pkts_rcvd.
10667 		 */
10668 		flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10669 		asoc->cmt_dac_pkts_rcvd = 0;
10670 	}
10671 #ifdef SCTP_ASOCLOG_OF_TSNS
10672 	stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10673 	stcb->asoc.cumack_log_atsnt++;
10674 	if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10675 		stcb->asoc.cumack_log_atsnt = 0;
10676 	}
10677 #endif
10678 	/* reset the readers interpretation */
10679 	stcb->freed_by_sorcv_sincelast = 0;
10680 
10681 	if (type == SCTP_SELECTIVE_ACK) {
10682 		sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10683 		nr_sack = NULL;
10684 		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10685 		if (highest_tsn > asoc->mapping_array_base_tsn) {
10686 			siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10687 		} else {
10688 			siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10689 		}
10690 	} else {
10691 		sack = NULL;
10692 		nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10693 		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10694 		if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10695 			siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10696 		} else {
10697 			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10698 		}
10699 	}
10700 
10701 	if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10702 		offset = 1;
10703 	} else {
10704 		offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10705 	}
10706 	if (((type == SCTP_SELECTIVE_ACK) &&
10707 	    SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10708 	    ((type == SCTP_NR_SELECTIVE_ACK) &&
10709 	    SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10710 		/* we have a gap .. maybe */
10711 		for (i = 0; i < siz; i++) {
10712 			tsn_map = asoc->mapping_array[i];
10713 			if (type == SCTP_SELECTIVE_ACK) {
10714 				tsn_map |= asoc->nr_mapping_array[i];
10715 			}
10716 			if (i == 0) {
10717 				/*
10718 				 * Clear all bits corresponding to TSNs
10719 				 * smaller or equal to the cumulative TSN.
10720 				 */
10721 				tsn_map &= (~0U << (1 - offset));
10722 			}
10723 			selector = &sack_array[tsn_map];
10724 			if (mergeable && selector->right_edge) {
10725 				/*
10726 				 * Backup, left and right edges were ok to
10727 				 * merge.
10728 				 */
10729 				num_gap_blocks--;
10730 				gap_descriptor--;
10731 			}
10732 			if (selector->num_entries == 0)
10733 				mergeable = 0;
10734 			else {
10735 				for (j = 0; j < selector->num_entries; j++) {
10736 					if (mergeable && selector->right_edge) {
10737 						/*
10738 						 * do a merge by NOT setting
10739 						 * the left side
10740 						 */
10741 						mergeable = 0;
10742 					} else {
10743 						/*
10744 						 * no merge, set the left
10745 						 * side
10746 						 */
10747 						mergeable = 0;
10748 						gap_descriptor->start = htons((selector->gaps[j].start + offset));
10749 					}
10750 					gap_descriptor->end = htons((selector->gaps[j].end + offset));
10751 					num_gap_blocks++;
10752 					gap_descriptor++;
10753 					if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10754 						/* no more room */
10755 						limit_reached = 1;
10756 						break;
10757 					}
10758 				}
10759 				if (selector->left_edge) {
10760 					mergeable = 1;
10761 				}
10762 			}
10763 			if (limit_reached) {
10764 				/* Reached the limit stop */
10765 				break;
10766 			}
10767 			offset += 8;
10768 		}
10769 	}
10770 	if ((type == SCTP_NR_SELECTIVE_ACK) &&
10771 	    (limit_reached == 0)) {
10772 
10773 		mergeable = 0;
10774 
10775 		if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10776 			siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10777 		} else {
10778 			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10779 		}
10780 
10781 		if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10782 			offset = 1;
10783 		} else {
10784 			offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10785 		}
10786 		if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10787 			/* we have a gap .. maybe */
10788 			for (i = 0; i < siz; i++) {
10789 				tsn_map = asoc->nr_mapping_array[i];
10790 				if (i == 0) {
10791 					/*
10792 					 * Clear all bits corresponding to
10793 					 * TSNs smaller or equal to the
10794 					 * cumulative TSN.
10795 					 */
10796 					tsn_map &= (~0U << (1 - offset));
10797 				}
10798 				selector = &sack_array[tsn_map];
10799 				if (mergeable && selector->right_edge) {
10800 					/*
10801 					 * Backup, left and right edges were
10802 					 * ok to merge.
10803 					 */
10804 					num_nr_gap_blocks--;
10805 					gap_descriptor--;
10806 				}
10807 				if (selector->num_entries == 0)
10808 					mergeable = 0;
10809 				else {
10810 					for (j = 0; j < selector->num_entries; j++) {
10811 						if (mergeable && selector->right_edge) {
10812 							/*
10813 							 * do a merge by NOT
10814 							 * setting the left
10815 							 * side
10816 							 */
10817 							mergeable = 0;
10818 						} else {
10819 							/*
10820 							 * no merge, set the
10821 							 * left side
10822 							 */
10823 							mergeable = 0;
10824 							gap_descriptor->start = htons((selector->gaps[j].start + offset));
10825 						}
10826 						gap_descriptor->end = htons((selector->gaps[j].end + offset));
10827 						num_nr_gap_blocks++;
10828 						gap_descriptor++;
10829 						if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10830 							/* no more room */
10831 							limit_reached = 1;
10832 							break;
10833 						}
10834 					}
10835 					if (selector->left_edge) {
10836 						mergeable = 1;
10837 					}
10838 				}
10839 				if (limit_reached) {
10840 					/* Reached the limit stop */
10841 					break;
10842 				}
10843 				offset += 8;
10844 			}
10845 		}
10846 	}
10847 	/* now we must add any dups we are going to report. */
10848 	if ((limit_reached == 0) && (asoc->numduptsns)) {
10849 		dup = (uint32_t *)gap_descriptor;
10850 		for (i = 0; i < asoc->numduptsns; i++) {
10851 			*dup = htonl(asoc->dup_tsns[i]);
10852 			dup++;
10853 			num_dups++;
10854 			if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10855 				/* no more room */
10856 				break;
10857 			}
10858 		}
10859 		asoc->numduptsns = 0;
10860 	}
10861 	/*
10862 	 * now that the chunk is prepared queue it to the control chunk
10863 	 * queue.
10864 	 */
10865 	if (type == SCTP_SELECTIVE_ACK) {
10866 		a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10867 		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10868 		    num_dups * sizeof(int32_t));
10869 		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10870 		sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10871 		sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10872 		sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10873 		sack->sack.num_dup_tsns = htons(num_dups);
10874 		sack->ch.chunk_type = type;
10875 		sack->ch.chunk_flags = flags;
10876 		sack->ch.chunk_length = htons(a_chk->send_size);
10877 	} else {
10878 		a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10879 		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10880 		    num_dups * sizeof(int32_t));
10881 		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10882 		nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10883 		nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10884 		nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10885 		nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10886 		nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10887 		nr_sack->nr_sack.reserved = 0;
10888 		nr_sack->ch.chunk_type = type;
10889 		nr_sack->ch.chunk_flags = flags;
10890 		nr_sack->ch.chunk_length = htons(a_chk->send_size);
10891 	}
10892 	TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10893 	asoc->my_last_reported_rwnd = asoc->my_rwnd;
10894 	asoc->ctrl_queue_cnt++;
10895 	asoc->send_sack = 0;
10896 	SCTP_STAT_INCR(sctps_sendsacks);
10897 	return;
10898 }
10899 
10900 void
10901 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10902 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10903     SCTP_UNUSED
10904 #endif
10905 )
10906 {
10907 	struct mbuf *m_abort, *m, *m_last;
10908 	struct mbuf *m_out, *m_end = NULL;
10909 	struct sctp_abort_chunk *abort;
10910 	struct sctp_auth_chunk *auth = NULL;
10911 	struct sctp_nets *net;
10912 	uint32_t vtag;
10913 	uint32_t auth_offset = 0;
10914 	int error;
10915 	uint16_t cause_len, chunk_len, padding_len;
10916 
10917 	SCTP_TCB_LOCK_ASSERT(stcb);
10918 	/*-
10919 	 * Add an AUTH chunk, if chunk requires it and save the offset into
10920 	 * the chain for AUTH
10921 	 */
10922 	if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10923 	    stcb->asoc.peer_auth_chunks)) {
10924 		m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10925 		    stcb, SCTP_ABORT_ASSOCIATION);
10926 		SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10927 	} else {
10928 		m_out = NULL;
10929 	}
10930 	m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10931 	if (m_abort == NULL) {
10932 		if (m_out) {
10933 			sctp_m_freem(m_out);
10934 		}
10935 		if (operr) {
10936 			sctp_m_freem(operr);
10937 		}
10938 		return;
10939 	}
10940 	/* link in any error */
10941 	SCTP_BUF_NEXT(m_abort) = operr;
10942 	cause_len = 0;
10943 	m_last = NULL;
10944 	for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10945 		cause_len += (uint16_t)SCTP_BUF_LEN(m);
10946 		if (SCTP_BUF_NEXT(m) == NULL) {
10947 			m_last = m;
10948 		}
10949 	}
10950 	SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10951 	chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10952 	padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10953 	if (m_out == NULL) {
10954 		/* NO Auth chunk prepended, so reserve space in front */
10955 		SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10956 		m_out = m_abort;
10957 	} else {
10958 		/* Put AUTH chunk at the front of the chain */
10959 		SCTP_BUF_NEXT(m_end) = m_abort;
10960 	}
10961 	if (stcb->asoc.alternate) {
10962 		net = stcb->asoc.alternate;
10963 	} else {
10964 		net = stcb->asoc.primary_destination;
10965 	}
10966 	/* Fill in the ABORT chunk header. */
10967 	abort = mtod(m_abort, struct sctp_abort_chunk *);
10968 	abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10969 	if (stcb->asoc.peer_vtag == 0) {
10970 		/* This happens iff the assoc is in COOKIE-WAIT state. */
10971 		vtag = stcb->asoc.my_vtag;
10972 		abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10973 	} else {
10974 		vtag = stcb->asoc.peer_vtag;
10975 		abort->ch.chunk_flags = 0;
10976 	}
10977 	abort->ch.chunk_length = htons(chunk_len);
10978 	/* Add padding, if necessary. */
10979 	if (padding_len > 0) {
10980 		if ((m_last == NULL) ||
10981 		    (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10982 			sctp_m_freem(m_out);
10983 			return;
10984 		}
10985 	}
10986 	if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10987 	    (struct sockaddr *)&net->ro._l_addr,
10988 	    m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10989 	    stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10990 	    stcb->asoc.primary_destination->port, NULL,
10991 	    0, 0,
10992 	    so_locked))) {
10993 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10994 		if (error == ENOBUFS) {
10995 			stcb->asoc.ifp_had_enobuf = 1;
10996 			SCTP_STAT_INCR(sctps_lowlevelerr);
10997 		}
10998 	} else {
10999 		stcb->asoc.ifp_had_enobuf = 0;
11000 	}
11001 	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11002 }
11003 
11004 void
11005 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11006     struct sctp_nets *net,
11007     int reflect_vtag)
11008 {
11009 	/* formulate and SEND a SHUTDOWN-COMPLETE */
11010 	struct mbuf *m_shutdown_comp;
11011 	struct sctp_shutdown_complete_chunk *shutdown_complete;
11012 	uint32_t vtag;
11013 	int error;
11014 	uint8_t flags;
11015 
11016 	m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11017 	if (m_shutdown_comp == NULL) {
11018 		/* no mbuf's */
11019 		return;
11020 	}
11021 	if (reflect_vtag) {
11022 		flags = SCTP_HAD_NO_TCB;
11023 		vtag = stcb->asoc.my_vtag;
11024 	} else {
11025 		flags = 0;
11026 		vtag = stcb->asoc.peer_vtag;
11027 	}
11028 	shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11029 	shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11030 	shutdown_complete->ch.chunk_flags = flags;
11031 	shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11032 	SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11033 	if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11034 	    (struct sockaddr *)&net->ro._l_addr,
11035 	    m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11036 	    stcb->sctp_ep->sctp_lport, stcb->rport,
11037 	    htonl(vtag),
11038 	    net->port, NULL,
11039 	    0, 0,
11040 	    SCTP_SO_NOT_LOCKED))) {
11041 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11042 		if (error == ENOBUFS) {
11043 			stcb->asoc.ifp_had_enobuf = 1;
11044 			SCTP_STAT_INCR(sctps_lowlevelerr);
11045 		}
11046 	} else {
11047 		stcb->asoc.ifp_had_enobuf = 0;
11048 	}
11049 	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11050 	return;
11051 }
11052 
11053 static void
11054 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11055     struct sctphdr *sh, uint32_t vtag,
11056     uint8_t type, struct mbuf *cause,
11057     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11058     uint32_t vrf_id, uint16_t port)
11059 {
11060 	struct mbuf *o_pak;
11061 	struct mbuf *mout;
11062 	struct sctphdr *shout;
11063 	struct sctp_chunkhdr *ch;
11064 #if defined(INET) || defined(INET6)
11065 	struct udphdr *udp;
11066 	int ret;
11067 #endif
11068 	int len, cause_len, padding_len;
11069 #ifdef INET
11070 	struct sockaddr_in *src_sin, *dst_sin;
11071 	struct ip *ip;
11072 #endif
11073 #ifdef INET6
11074 	struct sockaddr_in6 *src_sin6, *dst_sin6;
11075 	struct ip6_hdr *ip6;
11076 #endif
11077 
11078 	/* Compute the length of the cause and add final padding. */
11079 	cause_len = 0;
11080 	if (cause != NULL) {
11081 		struct mbuf *m_at, *m_last = NULL;
11082 
11083 		for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11084 			if (SCTP_BUF_NEXT(m_at) == NULL)
11085 				m_last = m_at;
11086 			cause_len += SCTP_BUF_LEN(m_at);
11087 		}
11088 		padding_len = cause_len % 4;
11089 		if (padding_len != 0) {
11090 			padding_len = 4 - padding_len;
11091 		}
11092 		if (padding_len != 0) {
11093 			if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11094 				sctp_m_freem(cause);
11095 				return;
11096 			}
11097 		}
11098 	} else {
11099 		padding_len = 0;
11100 	}
11101 	/* Get an mbuf for the header. */
11102 	len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11103 	switch (dst->sa_family) {
11104 #ifdef INET
11105 	case AF_INET:
11106 		len += sizeof(struct ip);
11107 		break;
11108 #endif
11109 #ifdef INET6
11110 	case AF_INET6:
11111 		len += sizeof(struct ip6_hdr);
11112 		break;
11113 #endif
11114 	default:
11115 		break;
11116 	}
11117 #if defined(INET) || defined(INET6)
11118 	if (port) {
11119 		len += sizeof(struct udphdr);
11120 	}
11121 #endif
11122 	mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11123 	if (mout == NULL) {
11124 		if (cause) {
11125 			sctp_m_freem(cause);
11126 		}
11127 		return;
11128 	}
11129 	SCTP_BUF_RESV_UF(mout, max_linkhdr);
11130 	SCTP_BUF_LEN(mout) = len;
11131 	SCTP_BUF_NEXT(mout) = cause;
11132 	M_SETFIB(mout, fibnum);
11133 	mout->m_pkthdr.flowid = mflowid;
11134 	M_HASHTYPE_SET(mout, mflowtype);
11135 #ifdef INET
11136 	ip = NULL;
11137 #endif
11138 #ifdef INET6
11139 	ip6 = NULL;
11140 #endif
11141 	switch (dst->sa_family) {
11142 #ifdef INET
11143 	case AF_INET:
11144 		src_sin = (struct sockaddr_in *)src;
11145 		dst_sin = (struct sockaddr_in *)dst;
11146 		ip = mtod(mout, struct ip *);
11147 		ip->ip_v = IPVERSION;
11148 		ip->ip_hl = (sizeof(struct ip) >> 2);
11149 		ip->ip_tos = 0;
11150 		ip->ip_off = 0;
11151 		ip_fillid(ip);
11152 		ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11153 		if (port) {
11154 			ip->ip_p = IPPROTO_UDP;
11155 		} else {
11156 			ip->ip_p = IPPROTO_SCTP;
11157 		}
11158 		ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11159 		ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11160 		ip->ip_sum = 0;
11161 		len = sizeof(struct ip);
11162 		shout = (struct sctphdr *)((caddr_t)ip + len);
11163 		break;
11164 #endif
11165 #ifdef INET6
11166 	case AF_INET6:
11167 		src_sin6 = (struct sockaddr_in6 *)src;
11168 		dst_sin6 = (struct sockaddr_in6 *)dst;
11169 		ip6 = mtod(mout, struct ip6_hdr *);
11170 		ip6->ip6_flow = htonl(0x60000000);
11171 		if (V_ip6_auto_flowlabel) {
11172 			ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11173 		}
11174 		ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11175 		if (port) {
11176 			ip6->ip6_nxt = IPPROTO_UDP;
11177 		} else {
11178 			ip6->ip6_nxt = IPPROTO_SCTP;
11179 		}
11180 		ip6->ip6_src = dst_sin6->sin6_addr;
11181 		ip6->ip6_dst = src_sin6->sin6_addr;
11182 		len = sizeof(struct ip6_hdr);
11183 		shout = (struct sctphdr *)((caddr_t)ip6 + len);
11184 		break;
11185 #endif
11186 	default:
11187 		len = 0;
11188 		shout = mtod(mout, struct sctphdr *);
11189 		break;
11190 	}
11191 #if defined(INET) || defined(INET6)
11192 	if (port) {
11193 		if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11194 			sctp_m_freem(mout);
11195 			return;
11196 		}
11197 		udp = (struct udphdr *)shout;
11198 		udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11199 		udp->uh_dport = port;
11200 		udp->uh_sum = 0;
11201 		udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11202 		    sizeof(struct sctphdr) +
11203 		    sizeof(struct sctp_chunkhdr) +
11204 		    cause_len + padding_len));
11205 		len += sizeof(struct udphdr);
11206 		shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11207 	} else {
11208 		udp = NULL;
11209 	}
11210 #endif
11211 	shout->src_port = sh->dest_port;
11212 	shout->dest_port = sh->src_port;
11213 	shout->checksum = 0;
11214 	if (vtag) {
11215 		shout->v_tag = htonl(vtag);
11216 	} else {
11217 		shout->v_tag = sh->v_tag;
11218 	}
11219 	len += sizeof(struct sctphdr);
11220 	ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11221 	ch->chunk_type = type;
11222 	if (vtag) {
11223 		ch->chunk_flags = 0;
11224 	} else {
11225 		ch->chunk_flags = SCTP_HAD_NO_TCB;
11226 	}
11227 	ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11228 	len += sizeof(struct sctp_chunkhdr);
11229 	len += cause_len + padding_len;
11230 
11231 	if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11232 		sctp_m_freem(mout);
11233 		return;
11234 	}
11235 	SCTP_ATTACH_CHAIN(o_pak, mout, len);
11236 	switch (dst->sa_family) {
11237 #ifdef INET
11238 	case AF_INET:
11239 		if (port) {
11240 			if (V_udp_cksum) {
11241 				udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11242 			} else {
11243 				udp->uh_sum = 0;
11244 			}
11245 		}
11246 		ip->ip_len = htons(len);
11247 		if (port) {
11248 #if defined(SCTP_WITH_NO_CSUM)
11249 			SCTP_STAT_INCR(sctps_sendnocrc);
11250 #else
11251 			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11252 			SCTP_STAT_INCR(sctps_sendswcrc);
11253 #endif
11254 			if (V_udp_cksum) {
11255 				SCTP_ENABLE_UDP_CSUM(o_pak);
11256 			}
11257 		} else {
11258 #if defined(SCTP_WITH_NO_CSUM)
11259 			SCTP_STAT_INCR(sctps_sendnocrc);
11260 #else
11261 			mout->m_pkthdr.csum_flags = CSUM_SCTP;
11262 			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11263 			SCTP_STAT_INCR(sctps_sendhwcrc);
11264 #endif
11265 		}
11266 #ifdef SCTP_PACKET_LOGGING
11267 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11268 			sctp_packet_log(o_pak);
11269 		}
11270 #endif
11271 		SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11272 		break;
11273 #endif
11274 #ifdef INET6
11275 	case AF_INET6:
11276 		ip6->ip6_plen = (uint16_t)(len - sizeof(struct ip6_hdr));
11277 		if (port) {
11278 #if defined(SCTP_WITH_NO_CSUM)
11279 			SCTP_STAT_INCR(sctps_sendnocrc);
11280 #else
11281 			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11282 			SCTP_STAT_INCR(sctps_sendswcrc);
11283 #endif
11284 			if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11285 				udp->uh_sum = 0xffff;
11286 			}
11287 		} else {
11288 #if defined(SCTP_WITH_NO_CSUM)
11289 			SCTP_STAT_INCR(sctps_sendnocrc);
11290 #else
11291 			mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11292 			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11293 			SCTP_STAT_INCR(sctps_sendhwcrc);
11294 #endif
11295 		}
11296 #ifdef SCTP_PACKET_LOGGING
11297 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11298 			sctp_packet_log(o_pak);
11299 		}
11300 #endif
11301 		SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11302 		break;
11303 #endif
11304 	default:
11305 		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11306 		    dst->sa_family);
11307 		sctp_m_freem(mout);
11308 		SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11309 		return;
11310 	}
11311 	SCTP_STAT_INCR(sctps_sendpackets);
11312 	SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11313 	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11314 	return;
11315 }
11316 
11317 void
11318 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11319     struct sctphdr *sh,
11320     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11321     uint32_t vrf_id, uint16_t port)
11322 {
11323 	sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11324 	    mflowtype, mflowid, fibnum,
11325 	    vrf_id, port);
11326 }
11327 
11328 void
11329 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11330 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11331     SCTP_UNUSED
11332 #endif
11333 )
11334 {
11335 	struct sctp_tmit_chunk *chk;
11336 	struct sctp_heartbeat_chunk *hb;
11337 	struct timeval now;
11338 
11339 	SCTP_TCB_LOCK_ASSERT(stcb);
11340 	if (net == NULL) {
11341 		return;
11342 	}
11343 	(void)SCTP_GETTIME_TIMEVAL(&now);
11344 	switch (net->ro._l_addr.sa.sa_family) {
11345 #ifdef INET
11346 	case AF_INET:
11347 		break;
11348 #endif
11349 #ifdef INET6
11350 	case AF_INET6:
11351 		break;
11352 #endif
11353 	default:
11354 		return;
11355 	}
11356 	sctp_alloc_a_chunk(stcb, chk);
11357 	if (chk == NULL) {
11358 		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11359 		return;
11360 	}
11361 	chk->copy_by_ref = 0;
11362 	chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11363 	chk->rec.chunk_id.can_take_data = 1;
11364 	chk->flags = 0;
11365 	chk->asoc = &stcb->asoc;
11366 	chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11367 
11368 	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11369 	if (chk->data == NULL) {
11370 		sctp_free_a_chunk(stcb, chk, so_locked);
11371 		return;
11372 	}
11373 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11374 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11375 	chk->sent = SCTP_DATAGRAM_UNSENT;
11376 	chk->snd_count = 0;
11377 	chk->whoTo = net;
11378 	atomic_add_int(&chk->whoTo->ref_count, 1);
11379 	/* Now we have a mbuf that we can fill in with the details */
11380 	hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11381 	memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11382 	/* fill out chunk header */
11383 	hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11384 	hb->ch.chunk_flags = 0;
11385 	hb->ch.chunk_length = htons(chk->send_size);
11386 	/* Fill out hb parameter */
11387 	hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11388 	hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11389 	hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11390 	hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11391 	/* Did our user request this one, put it in */
11392 	hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11393 	hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11394 	if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11395 		/*
11396 		 * we only take from the entropy pool if the address is not
11397 		 * confirmed.
11398 		 */
11399 		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11400 		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11401 	} else {
11402 		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11403 		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11404 	}
11405 	switch (net->ro._l_addr.sa.sa_family) {
11406 #ifdef INET
11407 	case AF_INET:
11408 		memcpy(hb->heartbeat.hb_info.address,
11409 		    &net->ro._l_addr.sin.sin_addr,
11410 		    sizeof(net->ro._l_addr.sin.sin_addr));
11411 		break;
11412 #endif
11413 #ifdef INET6
11414 	case AF_INET6:
11415 		memcpy(hb->heartbeat.hb_info.address,
11416 		    &net->ro._l_addr.sin6.sin6_addr,
11417 		    sizeof(net->ro._l_addr.sin6.sin6_addr));
11418 		break;
11419 #endif
11420 	default:
11421 		if (chk->data) {
11422 			sctp_m_freem(chk->data);
11423 			chk->data = NULL;
11424 		}
11425 		sctp_free_a_chunk(stcb, chk, so_locked);
11426 		return;
11427 		break;
11428 	}
11429 	net->hb_responded = 0;
11430 	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11431 	stcb->asoc.ctrl_queue_cnt++;
11432 	SCTP_STAT_INCR(sctps_sendheartbeat);
11433 	return;
11434 }
11435 
11436 void
11437 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11438     uint32_t high_tsn)
11439 {
11440 	struct sctp_association *asoc;
11441 	struct sctp_ecne_chunk *ecne;
11442 	struct sctp_tmit_chunk *chk;
11443 
11444 	if (net == NULL) {
11445 		return;
11446 	}
11447 	asoc = &stcb->asoc;
11448 	SCTP_TCB_LOCK_ASSERT(stcb);
11449 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11450 		if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11451 			/* found a previous ECN_ECHO update it if needed */
11452 			uint32_t cnt, ctsn;
11453 
11454 			ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11455 			ctsn = ntohl(ecne->tsn);
11456 			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11457 				ecne->tsn = htonl(high_tsn);
11458 				SCTP_STAT_INCR(sctps_queue_upd_ecne);
11459 			}
11460 			cnt = ntohl(ecne->num_pkts_since_cwr);
11461 			cnt++;
11462 			ecne->num_pkts_since_cwr = htonl(cnt);
11463 			return;
11464 		}
11465 	}
11466 	/* nope could not find one to update so we must build one */
11467 	sctp_alloc_a_chunk(stcb, chk);
11468 	if (chk == NULL) {
11469 		return;
11470 	}
11471 	SCTP_STAT_INCR(sctps_queue_upd_ecne);
11472 	chk->copy_by_ref = 0;
11473 	chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11474 	chk->rec.chunk_id.can_take_data = 0;
11475 	chk->flags = 0;
11476 	chk->asoc = &stcb->asoc;
11477 	chk->send_size = sizeof(struct sctp_ecne_chunk);
11478 	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11479 	if (chk->data == NULL) {
11480 		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11481 		return;
11482 	}
11483 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11484 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11485 	chk->sent = SCTP_DATAGRAM_UNSENT;
11486 	chk->snd_count = 0;
11487 	chk->whoTo = net;
11488 	atomic_add_int(&chk->whoTo->ref_count, 1);
11489 
11490 	stcb->asoc.ecn_echo_cnt_onq++;
11491 	ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11492 	ecne->ch.chunk_type = SCTP_ECN_ECHO;
11493 	ecne->ch.chunk_flags = 0;
11494 	ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11495 	ecne->tsn = htonl(high_tsn);
11496 	ecne->num_pkts_since_cwr = htonl(1);
11497 	TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11498 	asoc->ctrl_queue_cnt++;
11499 }
11500 
11501 void
11502 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11503     struct mbuf *m, int len, int iphlen, int bad_crc)
11504 {
11505 	struct sctp_association *asoc;
11506 	struct sctp_pktdrop_chunk *drp;
11507 	struct sctp_tmit_chunk *chk;
11508 	uint8_t *datap;
11509 	int was_trunc = 0;
11510 	int fullsz = 0;
11511 	long spc;
11512 	int offset;
11513 	struct sctp_chunkhdr *ch, chunk_buf;
11514 	unsigned int chk_length;
11515 
11516 	if (!stcb) {
11517 		return;
11518 	}
11519 	asoc = &stcb->asoc;
11520 	SCTP_TCB_LOCK_ASSERT(stcb);
11521 	if (asoc->pktdrop_supported == 0) {
11522 		/*-
11523 		 * peer must declare support before I send one.
11524 		 */
11525 		return;
11526 	}
11527 	if (stcb->sctp_socket == NULL) {
11528 		return;
11529 	}
11530 	sctp_alloc_a_chunk(stcb, chk);
11531 	if (chk == NULL) {
11532 		return;
11533 	}
11534 	chk->copy_by_ref = 0;
11535 	chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11536 	chk->rec.chunk_id.can_take_data = 1;
11537 	chk->flags = 0;
11538 	len -= iphlen;
11539 	chk->send_size = len;
11540 	/* Validate that we do not have an ABORT in here. */
11541 	offset = iphlen + sizeof(struct sctphdr);
11542 	ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11543 	    sizeof(*ch), (uint8_t *)&chunk_buf);
11544 	while (ch != NULL) {
11545 		chk_length = ntohs(ch->chunk_length);
11546 		if (chk_length < sizeof(*ch)) {
11547 			/* break to abort land */
11548 			break;
11549 		}
11550 		switch (ch->chunk_type) {
11551 		case SCTP_PACKET_DROPPED:
11552 		case SCTP_ABORT_ASSOCIATION:
11553 		case SCTP_INITIATION_ACK:
11554 			/**
11555 			 * We don't respond with an PKT-DROP to an ABORT
11556 			 * or PKT-DROP. We also do not respond to an
11557 			 * INIT-ACK, because we can't know if the initiation
11558 			 * tag is correct or not.
11559 			 */
11560 			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11561 			return;
11562 		default:
11563 			break;
11564 		}
11565 		offset += SCTP_SIZE32(chk_length);
11566 		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11567 		    sizeof(*ch), (uint8_t *)&chunk_buf);
11568 	}
11569 
11570 	if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11571 	    min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11572 		/*
11573 		 * only send 1 mtu worth, trim off the excess on the end.
11574 		 */
11575 		fullsz = len;
11576 		len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11577 		was_trunc = 1;
11578 	}
11579 	chk->asoc = &stcb->asoc;
11580 	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11581 	if (chk->data == NULL) {
11582 jump_out:
11583 		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11584 		return;
11585 	}
11586 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11587 	drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11588 	if (drp == NULL) {
11589 		sctp_m_freem(chk->data);
11590 		chk->data = NULL;
11591 		goto jump_out;
11592 	}
11593 	chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11594 	    sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11595 	chk->book_size_scale = 0;
11596 	if (was_trunc) {
11597 		drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11598 		drp->trunc_len = htons(fullsz);
11599 		/*
11600 		 * Len is already adjusted to size minus overhead above take
11601 		 * out the pkt_drop chunk itself from it.
11602 		 */
11603 		chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11604 		len = chk->send_size;
11605 	} else {
11606 		/* no truncation needed */
11607 		drp->ch.chunk_flags = 0;
11608 		drp->trunc_len = htons(0);
11609 	}
11610 	if (bad_crc) {
11611 		drp->ch.chunk_flags |= SCTP_BADCRC;
11612 	}
11613 	chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11614 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11615 	chk->sent = SCTP_DATAGRAM_UNSENT;
11616 	chk->snd_count = 0;
11617 	if (net) {
11618 		/* we should hit here */
11619 		chk->whoTo = net;
11620 		atomic_add_int(&chk->whoTo->ref_count, 1);
11621 	} else {
11622 		chk->whoTo = NULL;
11623 	}
11624 	drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11625 	drp->ch.chunk_length = htons(chk->send_size);
11626 	spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11627 	if (spc < 0) {
11628 		spc = 0;
11629 	}
11630 	drp->bottle_bw = htonl(spc);
11631 	if (asoc->my_rwnd) {
11632 		drp->current_onq = htonl(asoc->size_on_reasm_queue +
11633 		    asoc->size_on_all_streams +
11634 		    asoc->my_rwnd_control_len +
11635 		    stcb->sctp_socket->so_rcv.sb_cc);
11636 	} else {
11637 		/*-
11638 		 * If my rwnd is 0, possibly from mbuf depletion as well as
11639 		 * space used, tell the peer there is NO space aka onq == bw
11640 		 */
11641 		drp->current_onq = htonl(spc);
11642 	}
11643 	drp->reserved = 0;
11644 	datap = drp->data;
11645 	m_copydata(m, iphlen, len, (caddr_t)datap);
11646 	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11647 	asoc->ctrl_queue_cnt++;
11648 }
11649 
11650 void
11651 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11652 {
11653 	struct sctp_association *asoc;
11654 	struct sctp_cwr_chunk *cwr;
11655 	struct sctp_tmit_chunk *chk;
11656 
11657 	SCTP_TCB_LOCK_ASSERT(stcb);
11658 	if (net == NULL) {
11659 		return;
11660 	}
11661 	asoc = &stcb->asoc;
11662 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11663 		if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11664 			/*
11665 			 * found a previous CWR queued to same destination
11666 			 * update it if needed
11667 			 */
11668 			uint32_t ctsn;
11669 
11670 			cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11671 			ctsn = ntohl(cwr->tsn);
11672 			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11673 				cwr->tsn = htonl(high_tsn);
11674 			}
11675 			if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11676 				/* Make sure override is carried */
11677 				cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11678 			}
11679 			return;
11680 		}
11681 	}
11682 	sctp_alloc_a_chunk(stcb, chk);
11683 	if (chk == NULL) {
11684 		return;
11685 	}
11686 	chk->copy_by_ref = 0;
11687 	chk->rec.chunk_id.id = SCTP_ECN_CWR;
11688 	chk->rec.chunk_id.can_take_data = 1;
11689 	chk->flags = 0;
11690 	chk->asoc = &stcb->asoc;
11691 	chk->send_size = sizeof(struct sctp_cwr_chunk);
11692 	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11693 	if (chk->data == NULL) {
11694 		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11695 		return;
11696 	}
11697 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11698 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11699 	chk->sent = SCTP_DATAGRAM_UNSENT;
11700 	chk->snd_count = 0;
11701 	chk->whoTo = net;
11702 	atomic_add_int(&chk->whoTo->ref_count, 1);
11703 	cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11704 	cwr->ch.chunk_type = SCTP_ECN_CWR;
11705 	cwr->ch.chunk_flags = override;
11706 	cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11707 	cwr->tsn = htonl(high_tsn);
11708 	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11709 	asoc->ctrl_queue_cnt++;
11710 }
11711 
11712 static int
11713 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11714     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11715 {
11716 	uint16_t len, old_len, i;
11717 	struct sctp_stream_reset_out_request *req_out;
11718 	struct sctp_chunkhdr *ch;
11719 	int at;
11720 	int number_entries = 0;
11721 
11722 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11723 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11724 	/* get to new offset for the param. */
11725 	req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11726 	/* now how long will this param be? */
11727 	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11728 		if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11729 		    (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11730 		    TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11731 			number_entries++;
11732 		}
11733 	}
11734 	if (number_entries == 0) {
11735 		return (0);
11736 	}
11737 	if (number_entries == stcb->asoc.streamoutcnt) {
11738 		number_entries = 0;
11739 	}
11740 	if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11741 		number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11742 	}
11743 	len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11744 	req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11745 	req_out->ph.param_length = htons(len);
11746 	req_out->request_seq = htonl(seq);
11747 	req_out->response_seq = htonl(resp_seq);
11748 	req_out->send_reset_at_tsn = htonl(last_sent);
11749 	at = 0;
11750 	if (number_entries) {
11751 		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11752 			if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11753 			    (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11754 			    TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11755 				req_out->list_of_streams[at] = htons(i);
11756 				at++;
11757 				stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11758 				if (at >= number_entries) {
11759 					break;
11760 				}
11761 			}
11762 		}
11763 	} else {
11764 		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11765 			stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11766 		}
11767 	}
11768 	if (SCTP_SIZE32(len) > len) {
11769 		/*-
11770 		 * Need to worry about the pad we may end up adding to the
11771 		 * end. This is easy since the struct is either aligned to 4
11772 		 * bytes or 2 bytes off.
11773 		 */
11774 		req_out->list_of_streams[number_entries] = 0;
11775 	}
11776 	/* now fix the chunk length */
11777 	ch->chunk_length = htons(len + old_len);
11778 	chk->book_size = len + old_len;
11779 	chk->book_size_scale = 0;
11780 	chk->send_size = SCTP_SIZE32(chk->book_size);
11781 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11782 	return (1);
11783 }
11784 
11785 static void
11786 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11787     int number_entries, uint16_t *list,
11788     uint32_t seq)
11789 {
11790 	uint16_t len, old_len, i;
11791 	struct sctp_stream_reset_in_request *req_in;
11792 	struct sctp_chunkhdr *ch;
11793 
11794 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11795 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11796 
11797 	/* get to new offset for the param. */
11798 	req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11799 	/* now how long will this param be? */
11800 	len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11801 	req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11802 	req_in->ph.param_length = htons(len);
11803 	req_in->request_seq = htonl(seq);
11804 	if (number_entries) {
11805 		for (i = 0; i < number_entries; i++) {
11806 			req_in->list_of_streams[i] = htons(list[i]);
11807 		}
11808 	}
11809 	if (SCTP_SIZE32(len) > len) {
11810 		/*-
11811 		 * Need to worry about the pad we may end up adding to the
11812 		 * end. This is easy since the struct is either aligned to 4
11813 		 * bytes or 2 bytes off.
11814 		 */
11815 		req_in->list_of_streams[number_entries] = 0;
11816 	}
11817 	/* now fix the chunk length */
11818 	ch->chunk_length = htons(len + old_len);
11819 	chk->book_size = len + old_len;
11820 	chk->book_size_scale = 0;
11821 	chk->send_size = SCTP_SIZE32(chk->book_size);
11822 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11823 	return;
11824 }
11825 
11826 static void
11827 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11828     uint32_t seq)
11829 {
11830 	uint16_t len, old_len;
11831 	struct sctp_stream_reset_tsn_request *req_tsn;
11832 	struct sctp_chunkhdr *ch;
11833 
11834 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11835 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11836 
11837 	/* get to new offset for the param. */
11838 	req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11839 	/* now how long will this param be? */
11840 	len = sizeof(struct sctp_stream_reset_tsn_request);
11841 	req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11842 	req_tsn->ph.param_length = htons(len);
11843 	req_tsn->request_seq = htonl(seq);
11844 
11845 	/* now fix the chunk length */
11846 	ch->chunk_length = htons(len + old_len);
11847 	chk->send_size = len + old_len;
11848 	chk->book_size = SCTP_SIZE32(chk->send_size);
11849 	chk->book_size_scale = 0;
11850 	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11851 	return;
11852 }
11853 
11854 void
11855 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11856     uint32_t resp_seq, uint32_t result)
11857 {
11858 	uint16_t len, old_len;
11859 	struct sctp_stream_reset_response *resp;
11860 	struct sctp_chunkhdr *ch;
11861 
11862 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11863 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11864 
11865 	/* get to new offset for the param. */
11866 	resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11867 	/* now how long will this param be? */
11868 	len = sizeof(struct sctp_stream_reset_response);
11869 	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11870 	resp->ph.param_length = htons(len);
11871 	resp->response_seq = htonl(resp_seq);
11872 	resp->result = ntohl(result);
11873 
11874 	/* now fix the chunk length */
11875 	ch->chunk_length = htons(len + old_len);
11876 	chk->book_size = len + old_len;
11877 	chk->book_size_scale = 0;
11878 	chk->send_size = SCTP_SIZE32(chk->book_size);
11879 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11880 	return;
11881 }
11882 
11883 void
11884 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11885     struct sctp_stream_reset_list *ent,
11886     int response)
11887 {
11888 	struct sctp_association *asoc;
11889 	struct sctp_tmit_chunk *chk;
11890 	struct sctp_chunkhdr *ch;
11891 
11892 	asoc = &stcb->asoc;
11893 
11894 	/*
11895 	 * Reset our last reset action to the new one IP -> response
11896 	 * (PERFORMED probably). This assures that if we fail to send, a
11897 	 * retran from the peer will get the new response.
11898 	 */
11899 	asoc->last_reset_action[0] = response;
11900 	if (asoc->stream_reset_outstanding) {
11901 		return;
11902 	}
11903 	sctp_alloc_a_chunk(stcb, chk);
11904 	if (chk == NULL) {
11905 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11906 		return;
11907 	}
11908 	chk->copy_by_ref = 0;
11909 	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11910 	chk->rec.chunk_id.can_take_data = 0;
11911 	chk->flags = 0;
11912 	chk->asoc = &stcb->asoc;
11913 	chk->book_size = sizeof(struct sctp_chunkhdr);
11914 	chk->send_size = SCTP_SIZE32(chk->book_size);
11915 	chk->book_size_scale = 0;
11916 	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11917 	if (chk->data == NULL) {
11918 		sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11919 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11920 		return;
11921 	}
11922 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11923 	/* setup chunk parameters */
11924 	chk->sent = SCTP_DATAGRAM_UNSENT;
11925 	chk->snd_count = 0;
11926 	if (stcb->asoc.alternate) {
11927 		chk->whoTo = stcb->asoc.alternate;
11928 	} else {
11929 		chk->whoTo = stcb->asoc.primary_destination;
11930 	}
11931 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11932 	ch->chunk_type = SCTP_STREAM_RESET;
11933 	ch->chunk_flags = 0;
11934 	ch->chunk_length = htons(chk->book_size);
11935 	atomic_add_int(&chk->whoTo->ref_count, 1);
11936 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11937 	sctp_add_stream_reset_result(chk, ent->seq, response);
11938 	/* insert the chunk for sending */
11939 	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11940 	    chk,
11941 	    sctp_next);
11942 	asoc->ctrl_queue_cnt++;
11943 }
11944 
11945 void
11946 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11947     uint32_t resp_seq, uint32_t result,
11948     uint32_t send_una, uint32_t recv_next)
11949 {
11950 	uint16_t len, old_len;
11951 	struct sctp_stream_reset_response_tsn *resp;
11952 	struct sctp_chunkhdr *ch;
11953 
11954 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11955 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11956 
11957 	/* get to new offset for the param. */
11958 	resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11959 	/* now how long will this param be? */
11960 	len = sizeof(struct sctp_stream_reset_response_tsn);
11961 	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11962 	resp->ph.param_length = htons(len);
11963 	resp->response_seq = htonl(resp_seq);
11964 	resp->result = htonl(result);
11965 	resp->senders_next_tsn = htonl(send_una);
11966 	resp->receivers_next_tsn = htonl(recv_next);
11967 
11968 	/* now fix the chunk length */
11969 	ch->chunk_length = htons(len + old_len);
11970 	chk->book_size = len + old_len;
11971 	chk->send_size = SCTP_SIZE32(chk->book_size);
11972 	chk->book_size_scale = 0;
11973 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11974 	return;
11975 }
11976 
11977 static void
11978 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11979     uint32_t seq,
11980     uint16_t adding)
11981 {
11982 	uint16_t len, old_len;
11983 	struct sctp_chunkhdr *ch;
11984 	struct sctp_stream_reset_add_strm *addstr;
11985 
11986 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11987 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11988 
11989 	/* get to new offset for the param. */
11990 	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11991 	/* now how long will this param be? */
11992 	len = sizeof(struct sctp_stream_reset_add_strm);
11993 
11994 	/* Fill it out. */
11995 	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11996 	addstr->ph.param_length = htons(len);
11997 	addstr->request_seq = htonl(seq);
11998 	addstr->number_of_streams = htons(adding);
11999 	addstr->reserved = 0;
12000 
12001 	/* now fix the chunk length */
12002 	ch->chunk_length = htons(len + old_len);
12003 	chk->send_size = len + old_len;
12004 	chk->book_size = SCTP_SIZE32(chk->send_size);
12005 	chk->book_size_scale = 0;
12006 	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12007 	return;
12008 }
12009 
12010 static void
12011 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
12012     uint32_t seq,
12013     uint16_t adding)
12014 {
12015 	uint16_t len, old_len;
12016 	struct sctp_chunkhdr *ch;
12017 	struct sctp_stream_reset_add_strm *addstr;
12018 
12019 	ch = mtod(chk->data, struct sctp_chunkhdr *);
12020 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12021 
12022 	/* get to new offset for the param. */
12023 	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12024 	/* now how long will this param be? */
12025 	len = sizeof(struct sctp_stream_reset_add_strm);
12026 	/* Fill it out. */
12027 	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12028 	addstr->ph.param_length = htons(len);
12029 	addstr->request_seq = htonl(seq);
12030 	addstr->number_of_streams = htons(adding);
12031 	addstr->reserved = 0;
12032 
12033 	/* now fix the chunk length */
12034 	ch->chunk_length = htons(len + old_len);
12035 	chk->send_size = len + old_len;
12036 	chk->book_size = SCTP_SIZE32(chk->send_size);
12037 	chk->book_size_scale = 0;
12038 	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12039 	return;
12040 }
12041 
12042 int
12043 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12044 {
12045 	struct sctp_association *asoc;
12046 	struct sctp_tmit_chunk *chk;
12047 	struct sctp_chunkhdr *ch;
12048 	uint32_t seq;
12049 
12050 	asoc = &stcb->asoc;
12051 	asoc->trigger_reset = 0;
12052 	if (asoc->stream_reset_outstanding) {
12053 		return (EALREADY);
12054 	}
12055 	sctp_alloc_a_chunk(stcb, chk);
12056 	if (chk == NULL) {
12057 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12058 		return (ENOMEM);
12059 	}
12060 	chk->copy_by_ref = 0;
12061 	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12062 	chk->rec.chunk_id.can_take_data = 0;
12063 	chk->flags = 0;
12064 	chk->asoc = &stcb->asoc;
12065 	chk->book_size = sizeof(struct sctp_chunkhdr);
12066 	chk->send_size = SCTP_SIZE32(chk->book_size);
12067 	chk->book_size_scale = 0;
12068 	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12069 	if (chk->data == NULL) {
12070 		sctp_free_a_chunk(stcb, chk, so_locked);
12071 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12072 		return (ENOMEM);
12073 	}
12074 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12075 
12076 	/* setup chunk parameters */
12077 	chk->sent = SCTP_DATAGRAM_UNSENT;
12078 	chk->snd_count = 0;
12079 	if (stcb->asoc.alternate) {
12080 		chk->whoTo = stcb->asoc.alternate;
12081 	} else {
12082 		chk->whoTo = stcb->asoc.primary_destination;
12083 	}
12084 	ch = mtod(chk->data, struct sctp_chunkhdr *);
12085 	ch->chunk_type = SCTP_STREAM_RESET;
12086 	ch->chunk_flags = 0;
12087 	ch->chunk_length = htons(chk->book_size);
12088 	atomic_add_int(&chk->whoTo->ref_count, 1);
12089 	SCTP_BUF_LEN(chk->data) = chk->send_size;
12090 	seq = stcb->asoc.str_reset_seq_out;
12091 	if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12092 		seq++;
12093 		asoc->stream_reset_outstanding++;
12094 	} else {
12095 		m_freem(chk->data);
12096 		chk->data = NULL;
12097 		sctp_free_a_chunk(stcb, chk, so_locked);
12098 		return (ENOENT);
12099 	}
12100 	asoc->str_reset = chk;
12101 	/* insert the chunk for sending */
12102 	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12103 	    chk,
12104 	    sctp_next);
12105 	asoc->ctrl_queue_cnt++;
12106 
12107 	if (stcb->asoc.send_sack) {
12108 		sctp_send_sack(stcb, so_locked);
12109 	}
12110 	sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12111 	return (0);
12112 }
12113 
12114 int
12115 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12116     uint16_t number_entries, uint16_t *list,
12117     uint8_t send_in_req,
12118     uint8_t send_tsn_req,
12119     uint8_t add_stream,
12120     uint16_t adding_o,
12121     uint16_t adding_i, uint8_t peer_asked)
12122 {
12123 	struct sctp_association *asoc;
12124 	struct sctp_tmit_chunk *chk;
12125 	struct sctp_chunkhdr *ch;
12126 	int can_send_out_req = 0;
12127 	uint32_t seq;
12128 
12129 	asoc = &stcb->asoc;
12130 	if (asoc->stream_reset_outstanding) {
12131 		/*-
12132 		 * Already one pending, must get ACK back to clear the flag.
12133 		 */
12134 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12135 		return (EBUSY);
12136 	}
12137 	if ((send_in_req == 0) && (send_tsn_req == 0) &&
12138 	    (add_stream == 0)) {
12139 		/* nothing to do */
12140 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12141 		return (EINVAL);
12142 	}
12143 	if (send_tsn_req && send_in_req) {
12144 		/* error, can't do that */
12145 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12146 		return (EINVAL);
12147 	} else if (send_in_req) {
12148 		can_send_out_req = 1;
12149 	}
12150 	if (number_entries > (MCLBYTES -
12151 	    SCTP_MIN_OVERHEAD -
12152 	    sizeof(struct sctp_chunkhdr) -
12153 	    sizeof(struct sctp_stream_reset_out_request)) /
12154 	    sizeof(uint16_t)) {
12155 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12156 		return (ENOMEM);
12157 	}
12158 	sctp_alloc_a_chunk(stcb, chk);
12159 	if (chk == NULL) {
12160 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12161 		return (ENOMEM);
12162 	}
12163 	chk->copy_by_ref = 0;
12164 	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12165 	chk->rec.chunk_id.can_take_data = 0;
12166 	chk->flags = 0;
12167 	chk->asoc = &stcb->asoc;
12168 	chk->book_size = sizeof(struct sctp_chunkhdr);
12169 	chk->send_size = SCTP_SIZE32(chk->book_size);
12170 	chk->book_size_scale = 0;
12171 
12172 	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12173 	if (chk->data == NULL) {
12174 		sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12175 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12176 		return (ENOMEM);
12177 	}
12178 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12179 
12180 	/* setup chunk parameters */
12181 	chk->sent = SCTP_DATAGRAM_UNSENT;
12182 	chk->snd_count = 0;
12183 	if (stcb->asoc.alternate) {
12184 		chk->whoTo = stcb->asoc.alternate;
12185 	} else {
12186 		chk->whoTo = stcb->asoc.primary_destination;
12187 	}
12188 	atomic_add_int(&chk->whoTo->ref_count, 1);
12189 	ch = mtod(chk->data, struct sctp_chunkhdr *);
12190 	ch->chunk_type = SCTP_STREAM_RESET;
12191 	ch->chunk_flags = 0;
12192 	ch->chunk_length = htons(chk->book_size);
12193 	SCTP_BUF_LEN(chk->data) = chk->send_size;
12194 
12195 	seq = stcb->asoc.str_reset_seq_out;
12196 	if (can_send_out_req) {
12197 		int ret;
12198 
12199 		ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12200 		if (ret) {
12201 			seq++;
12202 			asoc->stream_reset_outstanding++;
12203 		}
12204 	}
12205 	if ((add_stream & 1) &&
12206 	    ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12207 		/* Need to allocate more */
12208 		struct sctp_stream_out *oldstream;
12209 		struct sctp_stream_queue_pending *sp, *nsp;
12210 		int i;
12211 #if defined(SCTP_DETAILED_STR_STATS)
12212 		int j;
12213 #endif
12214 
12215 		oldstream = stcb->asoc.strmout;
12216 		/* get some more */
12217 		SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12218 		    (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12219 		    SCTP_M_STRMO);
12220 		if (stcb->asoc.strmout == NULL) {
12221 			uint8_t x;
12222 
12223 			stcb->asoc.strmout = oldstream;
12224 			/* Turn off the bit */
12225 			x = add_stream & 0xfe;
12226 			add_stream = x;
12227 			goto skip_stuff;
12228 		}
12229 		/*
12230 		 * Ok now we proceed with copying the old out stuff and
12231 		 * initializing the new stuff.
12232 		 */
12233 		SCTP_TCB_SEND_LOCK(stcb);
12234 		stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12235 		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12236 			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12237 			stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12238 			stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12239 			stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12240 			stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12241 			stcb->asoc.strmout[i].sid = i;
12242 			stcb->asoc.strmout[i].state = oldstream[i].state;
12243 			/* FIX ME FIX ME */
12244 			/*
12245 			 * This should be a SS_COPY operation FIX ME STREAM
12246 			 * SCHEDULER EXPERT
12247 			 */
12248 			stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12249 			/* now anything on those queues? */
12250 			TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12251 				TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12252 				TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12253 			}
12254 
12255 		}
12256 		/* now the new streams */
12257 		stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12258 		for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12259 			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12260 			stcb->asoc.strmout[i].chunks_on_queues = 0;
12261 #if defined(SCTP_DETAILED_STR_STATS)
12262 			for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12263 				stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12264 				stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12265 			}
12266 #else
12267 			stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12268 			stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12269 #endif
12270 			stcb->asoc.strmout[i].next_mid_ordered = 0;
12271 			stcb->asoc.strmout[i].next_mid_unordered = 0;
12272 			stcb->asoc.strmout[i].sid = i;
12273 			stcb->asoc.strmout[i].last_msg_incomplete = 0;
12274 			stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12275 			stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12276 		}
12277 		stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12278 		SCTP_FREE(oldstream, SCTP_M_STRMO);
12279 		SCTP_TCB_SEND_UNLOCK(stcb);
12280 	}
12281 skip_stuff:
12282 	if ((add_stream & 1) && (adding_o > 0)) {
12283 		asoc->strm_pending_add_size = adding_o;
12284 		asoc->peer_req_out = peer_asked;
12285 		sctp_add_an_out_stream(chk, seq, adding_o);
12286 		seq++;
12287 		asoc->stream_reset_outstanding++;
12288 	}
12289 	if ((add_stream & 2) && (adding_i > 0)) {
12290 		sctp_add_an_in_stream(chk, seq, adding_i);
12291 		seq++;
12292 		asoc->stream_reset_outstanding++;
12293 	}
12294 	if (send_in_req) {
12295 		sctp_add_stream_reset_in(chk, number_entries, list, seq);
12296 		seq++;
12297 		asoc->stream_reset_outstanding++;
12298 	}
12299 	if (send_tsn_req) {
12300 		sctp_add_stream_reset_tsn(chk, seq);
12301 		asoc->stream_reset_outstanding++;
12302 	}
12303 	asoc->str_reset = chk;
12304 	/* insert the chunk for sending */
12305 	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12306 	    chk,
12307 	    sctp_next);
12308 	asoc->ctrl_queue_cnt++;
12309 	if (stcb->asoc.send_sack) {
12310 		sctp_send_sack(stcb, SCTP_SO_LOCKED);
12311 	}
12312 	sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12313 	return (0);
12314 }
12315 
12316 void
12317 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12318     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12319     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12320     uint32_t vrf_id, uint16_t port)
12321 {
12322 	/* Don't respond to an ABORT with an ABORT. */
12323 	if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12324 		if (cause)
12325 			sctp_m_freem(cause);
12326 		return;
12327 	}
12328 	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12329 	    mflowtype, mflowid, fibnum,
12330 	    vrf_id, port);
12331 	return;
12332 }
12333 
12334 void
12335 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12336     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12337     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12338     uint32_t vrf_id, uint16_t port)
12339 {
12340 	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12341 	    mflowtype, mflowid, fibnum,
12342 	    vrf_id, port);
12343 	return;
12344 }
12345 
12346 static struct mbuf *
12347 sctp_copy_resume(struct uio *uio,
12348     int max_send_len,
12349     int user_marks_eor,
12350     int *error,
12351     uint32_t *sndout,
12352     struct mbuf **new_tail)
12353 {
12354 	struct mbuf *m;
12355 
12356 	m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12357 	    (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12358 	if (m == NULL) {
12359 		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12360 		*error = ENOBUFS;
12361 	} else {
12362 		*sndout = m_length(m, NULL);
12363 		*new_tail = m_last(m);
12364 	}
12365 	return (m);
12366 }
12367 
12368 static int
12369 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12370     struct uio *uio,
12371     int resv_upfront)
12372 {
12373 	sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12374 	    resv_upfront, 0);
12375 	if (sp->data == NULL) {
12376 		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12377 		return (ENOBUFS);
12378 	}
12379 	sp->tail_mbuf = m_last(sp->data);
12380 	return (0);
12381 }
12382 
12383 
12384 
12385 static struct sctp_stream_queue_pending *
12386 sctp_copy_it_in(struct sctp_tcb *stcb,
12387     struct sctp_association *asoc,
12388     struct sctp_sndrcvinfo *srcv,
12389     struct uio *uio,
12390     struct sctp_nets *net,
12391     int max_send_len,
12392     int user_marks_eor,
12393     int *error)
12394 {
12395 	/*-
12396 	 * This routine must be very careful in its work. Protocol
12397 	 * processing is up and running so care must be taken to spl...()
12398 	 * when you need to do something that may effect the stcb/asoc. The
12399 	 * sb is locked however. When data is copied the protocol processing
12400 	 * should be enabled since this is a slower operation...
12401 	 */
12402 	struct sctp_stream_queue_pending *sp = NULL;
12403 	int resv_in_first;
12404 
12405 	*error = 0;
12406 	/* Now can we send this? */
12407 	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12408 	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12409 	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12410 	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12411 		/* got data while shutting down */
12412 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12413 		*error = ECONNRESET;
12414 		goto out_now;
12415 	}
12416 	sctp_alloc_a_strmoq(stcb, sp);
12417 	if (sp == NULL) {
12418 		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12419 		*error = ENOMEM;
12420 		goto out_now;
12421 	}
12422 	sp->act_flags = 0;
12423 	sp->sender_all_done = 0;
12424 	sp->sinfo_flags = srcv->sinfo_flags;
12425 	sp->timetolive = srcv->sinfo_timetolive;
12426 	sp->ppid = srcv->sinfo_ppid;
12427 	sp->context = srcv->sinfo_context;
12428 	sp->fsn = 0;
12429 	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12430 
12431 	sp->sid = srcv->sinfo_stream;
12432 	sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12433 	if ((sp->length == (uint32_t)uio->uio_resid) &&
12434 	    ((user_marks_eor == 0) ||
12435 	    (srcv->sinfo_flags & SCTP_EOF) ||
12436 	    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12437 		sp->msg_is_complete = 1;
12438 	} else {
12439 		sp->msg_is_complete = 0;
12440 	}
12441 	sp->sender_all_done = 0;
12442 	sp->some_taken = 0;
12443 	sp->put_last_out = 0;
12444 	resv_in_first = sizeof(struct sctp_data_chunk);
12445 	sp->data = sp->tail_mbuf = NULL;
12446 	if (sp->length == 0) {
12447 		*error = 0;
12448 		goto skip_copy;
12449 	}
12450 	if (srcv->sinfo_keynumber_valid) {
12451 		sp->auth_keyid = srcv->sinfo_keynumber;
12452 	} else {
12453 		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12454 	}
12455 	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12456 		sctp_auth_key_acquire(stcb, sp->auth_keyid);
12457 		sp->holds_key_ref = 1;
12458 	}
12459 	*error = sctp_copy_one(sp, uio, resv_in_first);
12460 skip_copy:
12461 	if (*error) {
12462 		sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12463 		sp = NULL;
12464 	} else {
12465 		if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12466 			sp->net = net;
12467 			atomic_add_int(&sp->net->ref_count, 1);
12468 		} else {
12469 			sp->net = NULL;
12470 		}
12471 		sctp_set_prsctp_policy(sp);
12472 	}
12473 out_now:
12474 	return (sp);
12475 }
12476 
12477 
12478 int
12479 sctp_sosend(struct socket *so,
12480     struct sockaddr *addr,
12481     struct uio *uio,
12482     struct mbuf *top,
12483     struct mbuf *control,
12484     int flags,
12485     struct thread *p
12486 )
12487 {
12488 	int error, use_sndinfo = 0;
12489 	struct sctp_sndrcvinfo sndrcvninfo;
12490 	struct sockaddr *addr_to_use;
12491 #if defined(INET) && defined(INET6)
12492 	struct sockaddr_in sin;
12493 #endif
12494 
12495 	if (control) {
12496 		/* process cmsg snd/rcv info (maybe a assoc-id) */
12497 		if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12498 		    sizeof(sndrcvninfo))) {
12499 			/* got one */
12500 			use_sndinfo = 1;
12501 		}
12502 	}
12503 	addr_to_use = addr;
12504 #if defined(INET) && defined(INET6)
12505 	if ((addr) && (addr->sa_family == AF_INET6)) {
12506 		struct sockaddr_in6 *sin6;
12507 
12508 		sin6 = (struct sockaddr_in6 *)addr;
12509 		if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12510 			in6_sin6_2_sin(&sin, sin6);
12511 			addr_to_use = (struct sockaddr *)&sin;
12512 		}
12513 	}
12514 #endif
12515 	error = sctp_lower_sosend(so, addr_to_use, uio, top,
12516 	    control,
12517 	    flags,
12518 	    use_sndinfo ? &sndrcvninfo : NULL
12519 	    ,p
12520 	    );
12521 	return (error);
12522 }
12523 
12524 
12525 int
12526 sctp_lower_sosend(struct socket *so,
12527     struct sockaddr *addr,
12528     struct uio *uio,
12529     struct mbuf *i_pak,
12530     struct mbuf *control,
12531     int flags,
12532     struct sctp_sndrcvinfo *srcv
12533     ,
12534     struct thread *p
12535 )
12536 {
12537 	unsigned int sndlen = 0, max_len;
12538 	int error, len;
12539 	struct mbuf *top = NULL;
12540 	int queue_only = 0, queue_only_for_init = 0;
12541 	int free_cnt_applied = 0;
12542 	int un_sent;
12543 	int now_filled = 0;
12544 	unsigned int inqueue_bytes = 0;
12545 	struct sctp_block_entry be;
12546 	struct sctp_inpcb *inp;
12547 	struct sctp_tcb *stcb = NULL;
12548 	struct timeval now;
12549 	struct sctp_nets *net;
12550 	struct sctp_association *asoc;
12551 	struct sctp_inpcb *t_inp;
12552 	int user_marks_eor;
12553 	int create_lock_applied = 0;
12554 	int nagle_applies = 0;
12555 	int some_on_control = 0;
12556 	int got_all_of_the_send = 0;
12557 	int hold_tcblock = 0;
12558 	int non_blocking = 0;
12559 	uint32_t local_add_more, local_soresv = 0;
12560 	uint16_t port;
12561 	uint16_t sinfo_flags;
12562 	sctp_assoc_t sinfo_assoc_id;
12563 
12564 	error = 0;
12565 	net = NULL;
12566 	stcb = NULL;
12567 	asoc = NULL;
12568 
12569 	t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12570 	if (inp == NULL) {
12571 		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12572 		error = EINVAL;
12573 		if (i_pak) {
12574 			SCTP_RELEASE_PKT(i_pak);
12575 		}
12576 		return (error);
12577 	}
12578 	if ((uio == NULL) && (i_pak == NULL)) {
12579 		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12580 		return (EINVAL);
12581 	}
12582 	user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12583 	atomic_add_int(&inp->total_sends, 1);
12584 	if (uio) {
12585 		if (uio->uio_resid < 0) {
12586 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12587 			return (EINVAL);
12588 		}
12589 		sndlen = (unsigned int)uio->uio_resid;
12590 	} else {
12591 		top = SCTP_HEADER_TO_CHAIN(i_pak);
12592 		sndlen = SCTP_HEADER_LEN(i_pak);
12593 	}
12594 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12595 	    (void *)addr,
12596 	    sndlen);
12597 	if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12598 	    (inp->sctp_socket->so_qlimit)) {
12599 		/* The listener can NOT send */
12600 		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12601 		error = ENOTCONN;
12602 		goto out_unlocked;
12603 	}
12604 	/**
12605 	 * Pre-screen address, if one is given the sin-len
12606 	 * must be set correctly!
12607 	 */
12608 	if (addr) {
12609 		union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12610 
12611 		switch (raddr->sa.sa_family) {
12612 #ifdef INET
12613 		case AF_INET:
12614 			if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12615 				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12616 				error = EINVAL;
12617 				goto out_unlocked;
12618 			}
12619 			port = raddr->sin.sin_port;
12620 			break;
12621 #endif
12622 #ifdef INET6
12623 		case AF_INET6:
12624 			if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12625 				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12626 				error = EINVAL;
12627 				goto out_unlocked;
12628 			}
12629 			port = raddr->sin6.sin6_port;
12630 			break;
12631 #endif
12632 		default:
12633 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12634 			error = EAFNOSUPPORT;
12635 			goto out_unlocked;
12636 		}
12637 	} else
12638 		port = 0;
12639 
12640 	if (srcv) {
12641 		sinfo_flags = srcv->sinfo_flags;
12642 		sinfo_assoc_id = srcv->sinfo_assoc_id;
12643 		if (INVALID_SINFO_FLAG(sinfo_flags) ||
12644 		    PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12645 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12646 			error = EINVAL;
12647 			goto out_unlocked;
12648 		}
12649 		if (srcv->sinfo_flags)
12650 			SCTP_STAT_INCR(sctps_sends_with_flags);
12651 	} else {
12652 		sinfo_flags = inp->def_send.sinfo_flags;
12653 		sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12654 	}
12655 	if (sinfo_flags & SCTP_SENDALL) {
12656 		/* its a sendall */
12657 		error = sctp_sendall(inp, uio, top, srcv);
12658 		top = NULL;
12659 		goto out_unlocked;
12660 	}
12661 	if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12662 		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12663 		error = EINVAL;
12664 		goto out_unlocked;
12665 	}
12666 	/* now we must find the assoc */
12667 	if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12668 	    (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12669 		SCTP_INP_RLOCK(inp);
12670 		stcb = LIST_FIRST(&inp->sctp_asoc_list);
12671 		if (stcb) {
12672 			SCTP_TCB_LOCK(stcb);
12673 			hold_tcblock = 1;
12674 		}
12675 		SCTP_INP_RUNLOCK(inp);
12676 	} else if (sinfo_assoc_id) {
12677 		stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12678 		if (stcb != NULL) {
12679 			hold_tcblock = 1;
12680 		}
12681 	} else if (addr) {
12682 		/*-
12683 		 * Since we did not use findep we must
12684 		 * increment it, and if we don't find a tcb
12685 		 * decrement it.
12686 		 */
12687 		SCTP_INP_WLOCK(inp);
12688 		SCTP_INP_INCR_REF(inp);
12689 		SCTP_INP_WUNLOCK(inp);
12690 		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12691 		if (stcb == NULL) {
12692 			SCTP_INP_WLOCK(inp);
12693 			SCTP_INP_DECR_REF(inp);
12694 			SCTP_INP_WUNLOCK(inp);
12695 		} else {
12696 			hold_tcblock = 1;
12697 		}
12698 	}
12699 	if ((stcb == NULL) && (addr)) {
12700 		/* Possible implicit send? */
12701 		SCTP_ASOC_CREATE_LOCK(inp);
12702 		create_lock_applied = 1;
12703 		if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12704 		    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12705 			/* Should I really unlock ? */
12706 			SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12707 			error = EINVAL;
12708 			goto out_unlocked;
12709 
12710 		}
12711 		if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12712 		    (addr->sa_family == AF_INET6)) {
12713 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12714 			error = EINVAL;
12715 			goto out_unlocked;
12716 		}
12717 		SCTP_INP_WLOCK(inp);
12718 		SCTP_INP_INCR_REF(inp);
12719 		SCTP_INP_WUNLOCK(inp);
12720 		/* With the lock applied look again */
12721 		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12722 		if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12723 			stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12724 		}
12725 		if (stcb == NULL) {
12726 			SCTP_INP_WLOCK(inp);
12727 			SCTP_INP_DECR_REF(inp);
12728 			SCTP_INP_WUNLOCK(inp);
12729 		} else {
12730 			hold_tcblock = 1;
12731 		}
12732 		if (error) {
12733 			goto out_unlocked;
12734 		}
12735 		if (t_inp != inp) {
12736 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12737 			error = ENOTCONN;
12738 			goto out_unlocked;
12739 		}
12740 	}
12741 	if (stcb == NULL) {
12742 		if (addr == NULL) {
12743 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12744 			error = ENOENT;
12745 			goto out_unlocked;
12746 		} else {
12747 			/* We must go ahead and start the INIT process */
12748 			uint32_t vrf_id;
12749 
12750 			if ((sinfo_flags & SCTP_ABORT) ||
12751 			    ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12752 				/*-
12753 				 * User asks to abort a non-existant assoc,
12754 				 * or EOF a non-existant assoc with no data
12755 				 */
12756 				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12757 				error = ENOENT;
12758 				goto out_unlocked;
12759 			}
12760 			/* get an asoc/stcb struct */
12761 			vrf_id = inp->def_vrf_id;
12762 #ifdef INVARIANTS
12763 			if (create_lock_applied == 0) {
12764 				panic("Error, should hold create lock and I don't?");
12765 			}
12766 #endif
12767 			stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12768 			    inp->sctp_ep.pre_open_stream_count,
12769 			    inp->sctp_ep.port,
12770 			    p);
12771 			if (stcb == NULL) {
12772 				/* Error is setup for us in the call */
12773 				goto out_unlocked;
12774 			}
12775 			if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12776 				stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12777 				/*
12778 				 * Set the connected flag so we can queue
12779 				 * data
12780 				 */
12781 				soisconnecting(so);
12782 			}
12783 			hold_tcblock = 1;
12784 			if (create_lock_applied) {
12785 				SCTP_ASOC_CREATE_UNLOCK(inp);
12786 				create_lock_applied = 0;
12787 			} else {
12788 				SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12789 			}
12790 			/*
12791 			 * Turn on queue only flag to prevent data from
12792 			 * being sent
12793 			 */
12794 			queue_only = 1;
12795 			asoc = &stcb->asoc;
12796 			SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12797 			(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12798 
12799 			/* initialize authentication params for the assoc */
12800 			sctp_initialize_auth_params(inp, stcb);
12801 
12802 			if (control) {
12803 				if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12804 					sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12805 					    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12806 					hold_tcblock = 0;
12807 					stcb = NULL;
12808 					goto out_unlocked;
12809 				}
12810 			}
12811 			/* out with the INIT */
12812 			queue_only_for_init = 1;
12813 			/*-
12814 			 * we may want to dig in after this call and adjust the MTU
12815 			 * value. It defaulted to 1500 (constant) but the ro
12816 			 * structure may now have an update and thus we may need to
12817 			 * change it BEFORE we append the message.
12818 			 */
12819 		}
12820 	} else
12821 		asoc = &stcb->asoc;
12822 	if (srcv == NULL)
12823 		srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12824 	if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12825 		if (addr)
12826 			net = sctp_findnet(stcb, addr);
12827 		else
12828 			net = NULL;
12829 		if ((net == NULL) ||
12830 		    ((port != 0) && (port != stcb->rport))) {
12831 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12832 			error = EINVAL;
12833 			goto out_unlocked;
12834 		}
12835 	} else {
12836 		if (stcb->asoc.alternate) {
12837 			net = stcb->asoc.alternate;
12838 		} else {
12839 			net = stcb->asoc.primary_destination;
12840 		}
12841 	}
12842 	atomic_add_int(&stcb->total_sends, 1);
12843 	/* Keep the stcb from being freed under our feet */
12844 	atomic_add_int(&asoc->refcnt, 1);
12845 	free_cnt_applied = 1;
12846 
12847 	if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12848 		if (sndlen > asoc->smallest_mtu) {
12849 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12850 			error = EMSGSIZE;
12851 			goto out_unlocked;
12852 		}
12853 	}
12854 	if (SCTP_SO_IS_NBIO(so)
12855 	    || (flags & MSG_NBIO)
12856 	    ) {
12857 		non_blocking = 1;
12858 	}
12859 	/* would we block? */
12860 	if (non_blocking) {
12861 		if (hold_tcblock == 0) {
12862 			SCTP_TCB_LOCK(stcb);
12863 			hold_tcblock = 1;
12864 		}
12865 		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12866 		if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12867 		    (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12868 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12869 			if (sndlen > SCTP_SB_LIMIT_SND(so))
12870 				error = EMSGSIZE;
12871 			else
12872 				error = EWOULDBLOCK;
12873 			goto out_unlocked;
12874 		}
12875 		stcb->asoc.sb_send_resv += sndlen;
12876 		SCTP_TCB_UNLOCK(stcb);
12877 		hold_tcblock = 0;
12878 	} else {
12879 		atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12880 	}
12881 	local_soresv = sndlen;
12882 	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12883 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12884 		error = ECONNRESET;
12885 		goto out_unlocked;
12886 	}
12887 	if (create_lock_applied) {
12888 		SCTP_ASOC_CREATE_UNLOCK(inp);
12889 		create_lock_applied = 0;
12890 	}
12891 	/* Is the stream no. valid? */
12892 	if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12893 		/* Invalid stream number */
12894 		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12895 		error = EINVAL;
12896 		goto out_unlocked;
12897 	}
12898 	if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12899 	    (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12900 		/*
12901 		 * Can't queue any data while stream reset is underway.
12902 		 */
12903 		if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12904 			error = EAGAIN;
12905 		} else {
12906 			error = EINVAL;
12907 		}
12908 		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12909 		goto out_unlocked;
12910 	}
12911 	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12912 	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12913 		queue_only = 1;
12914 	}
12915 	/* we are now done with all control */
12916 	if (control) {
12917 		sctp_m_freem(control);
12918 		control = NULL;
12919 	}
12920 	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12921 	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12922 	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12923 	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12924 		if (srcv->sinfo_flags & SCTP_ABORT) {
12925 			;
12926 		} else {
12927 			SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12928 			error = ECONNRESET;
12929 			goto out_unlocked;
12930 		}
12931 	}
12932 	/* Ok, we will attempt a msgsnd :> */
12933 	if (p) {
12934 		p->td_ru.ru_msgsnd++;
12935 	}
12936 	/* Are we aborting? */
12937 	if (srcv->sinfo_flags & SCTP_ABORT) {
12938 		struct mbuf *mm;
12939 		int tot_demand, tot_out = 0, max_out;
12940 
12941 		SCTP_STAT_INCR(sctps_sends_with_abort);
12942 		if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12943 		    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12944 			/* It has to be up before we abort */
12945 			/* how big is the user initiated abort? */
12946 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12947 			error = EINVAL;
12948 			goto out;
12949 		}
12950 		if (hold_tcblock) {
12951 			SCTP_TCB_UNLOCK(stcb);
12952 			hold_tcblock = 0;
12953 		}
12954 		if (top) {
12955 			struct mbuf *cntm = NULL;
12956 
12957 			mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12958 			if (sndlen != 0) {
12959 				for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12960 					tot_out += SCTP_BUF_LEN(cntm);
12961 				}
12962 			}
12963 		} else {
12964 			/* Must fit in a MTU */
12965 			tot_out = sndlen;
12966 			tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12967 			if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12968 				/* To big */
12969 				SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12970 				error = EMSGSIZE;
12971 				goto out;
12972 			}
12973 			mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12974 		}
12975 		if (mm == NULL) {
12976 			SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12977 			error = ENOMEM;
12978 			goto out;
12979 		}
12980 		max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12981 		max_out -= sizeof(struct sctp_abort_msg);
12982 		if (tot_out > max_out) {
12983 			tot_out = max_out;
12984 		}
12985 		if (mm) {
12986 			struct sctp_paramhdr *ph;
12987 
12988 			/* now move forward the data pointer */
12989 			ph = mtod(mm, struct sctp_paramhdr *);
12990 			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12991 			ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12992 			ph++;
12993 			SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12994 			if (top == NULL) {
12995 				error = uiomove((caddr_t)ph, (int)tot_out, uio);
12996 				if (error) {
12997 					/*-
12998 					 * Here if we can't get his data we
12999 					 * still abort we just don't get to
13000 					 * send the users note :-0
13001 					 */
13002 					sctp_m_freem(mm);
13003 					mm = NULL;
13004 				}
13005 			} else {
13006 				if (sndlen != 0) {
13007 					SCTP_BUF_NEXT(mm) = top;
13008 				}
13009 			}
13010 		}
13011 		if (hold_tcblock == 0) {
13012 			SCTP_TCB_LOCK(stcb);
13013 		}
13014 		atomic_add_int(&stcb->asoc.refcnt, -1);
13015 		free_cnt_applied = 0;
13016 		/* release this lock, otherwise we hang on ourselves */
13017 		sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13018 		/* now relock the stcb so everything is sane */
13019 		hold_tcblock = 0;
13020 		stcb = NULL;
13021 		/*
13022 		 * In this case top is already chained to mm avoid double
13023 		 * free, since we free it below if top != NULL and driver
13024 		 * would free it after sending the packet out
13025 		 */
13026 		if (sndlen != 0) {
13027 			top = NULL;
13028 		}
13029 		goto out_unlocked;
13030 	}
13031 	/* Calculate the maximum we can send */
13032 	inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13033 	if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13034 		if (non_blocking) {
13035 			/* we already checked for non-blocking above. */
13036 			max_len = sndlen;
13037 		} else {
13038 			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13039 		}
13040 	} else {
13041 		max_len = 0;
13042 	}
13043 	if (hold_tcblock) {
13044 		SCTP_TCB_UNLOCK(stcb);
13045 		hold_tcblock = 0;
13046 	}
13047 	if (asoc->strmout == NULL) {
13048 		/* huh? software error */
13049 		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13050 		error = EFAULT;
13051 		goto out_unlocked;
13052 	}
13053 	/* Unless E_EOR mode is on, we must make a send FIT in one call. */
13054 	if ((user_marks_eor == 0) &&
13055 	    (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13056 		/* It will NEVER fit */
13057 		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13058 		error = EMSGSIZE;
13059 		goto out_unlocked;
13060 	}
13061 	if ((uio == NULL) && user_marks_eor) {
13062 		/*-
13063 		 * We do not support eeor mode for
13064 		 * sending with mbuf chains (like sendfile).
13065 		 */
13066 		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13067 		error = EINVAL;
13068 		goto out_unlocked;
13069 	}
13070 	if (user_marks_eor) {
13071 		local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13072 	} else {
13073 		/*-
13074 		 * For non-eeor the whole message must fit in
13075 		 * the socket send buffer.
13076 		 */
13077 		local_add_more = sndlen;
13078 	}
13079 	len = 0;
13080 	if (non_blocking) {
13081 		goto skip_preblock;
13082 	}
13083 	if (((max_len <= local_add_more) &&
13084 	    (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13085 	    (max_len == 0) ||
13086 	    ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13087 		/* No room right now ! */
13088 		SOCKBUF_LOCK(&so->so_snd);
13089 		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13090 		while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13091 		    ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13092 			SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13093 			    (unsigned int)SCTP_SB_LIMIT_SND(so),
13094 			    inqueue_bytes,
13095 			    local_add_more,
13096 			    stcb->asoc.stream_queue_cnt,
13097 			    stcb->asoc.chunks_on_out_queue,
13098 			    SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13099 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13100 				sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13101 			}
13102 			be.error = 0;
13103 			stcb->block_entry = &be;
13104 			error = sbwait(&so->so_snd);
13105 			stcb->block_entry = NULL;
13106 			if (error || so->so_error || be.error) {
13107 				if (error == 0) {
13108 					if (so->so_error)
13109 						error = so->so_error;
13110 					if (be.error) {
13111 						error = be.error;
13112 					}
13113 				}
13114 				SOCKBUF_UNLOCK(&so->so_snd);
13115 				goto out_unlocked;
13116 			}
13117 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13118 				sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13119 				    asoc, stcb->asoc.total_output_queue_size);
13120 			}
13121 			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13122 				SOCKBUF_UNLOCK(&so->so_snd);
13123 				goto out_unlocked;
13124 			}
13125 			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13126 		}
13127 		if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13128 			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13129 		} else {
13130 			max_len = 0;
13131 		}
13132 		SOCKBUF_UNLOCK(&so->so_snd);
13133 	}
13134 skip_preblock:
13135 	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13136 		goto out_unlocked;
13137 	}
13138 	/*
13139 	 * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13140 	 * case NOTE: uio will be null when top/mbuf is passed
13141 	 */
13142 	if (sndlen == 0) {
13143 		if (srcv->sinfo_flags & SCTP_EOF) {
13144 			got_all_of_the_send = 1;
13145 			goto dataless_eof;
13146 		} else {
13147 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13148 			error = EINVAL;
13149 			goto out;
13150 		}
13151 	}
13152 	if (top == NULL) {
13153 		struct sctp_stream_queue_pending *sp;
13154 		struct sctp_stream_out *strm;
13155 		uint32_t sndout;
13156 
13157 		SCTP_TCB_SEND_LOCK(stcb);
13158 		if ((asoc->stream_locked) &&
13159 		    (asoc->stream_locked_on != srcv->sinfo_stream)) {
13160 			SCTP_TCB_SEND_UNLOCK(stcb);
13161 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13162 			error = EINVAL;
13163 			goto out;
13164 		}
13165 		SCTP_TCB_SEND_UNLOCK(stcb);
13166 
13167 		strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13168 		if (strm->last_msg_incomplete == 0) {
13169 	do_a_copy_in:
13170 			sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13171 			if ((sp == NULL) || (error)) {
13172 				goto out;
13173 			}
13174 			SCTP_TCB_SEND_LOCK(stcb);
13175 			if (sp->msg_is_complete) {
13176 				strm->last_msg_incomplete = 0;
13177 				asoc->stream_locked = 0;
13178 			} else {
13179 				/*
13180 				 * Just got locked to this guy in case of an
13181 				 * interrupt.
13182 				 */
13183 				strm->last_msg_incomplete = 1;
13184 				if (stcb->asoc.idata_supported == 0) {
13185 					asoc->stream_locked = 1;
13186 					asoc->stream_locked_on = srcv->sinfo_stream;
13187 				}
13188 				sp->sender_all_done = 0;
13189 			}
13190 			sctp_snd_sb_alloc(stcb, sp->length);
13191 			atomic_add_int(&asoc->stream_queue_cnt, 1);
13192 			if (srcv->sinfo_flags & SCTP_UNORDERED) {
13193 				SCTP_STAT_INCR(sctps_sends_with_unord);
13194 			}
13195 			TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13196 			stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13197 			SCTP_TCB_SEND_UNLOCK(stcb);
13198 		} else {
13199 			SCTP_TCB_SEND_LOCK(stcb);
13200 			sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13201 			SCTP_TCB_SEND_UNLOCK(stcb);
13202 			if (sp == NULL) {
13203 				/* ???? Huh ??? last msg is gone */
13204 #ifdef INVARIANTS
13205 				panic("Warning: Last msg marked incomplete, yet nothing left?");
13206 #else
13207 				SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13208 				strm->last_msg_incomplete = 0;
13209 #endif
13210 				goto do_a_copy_in;
13211 
13212 			}
13213 		}
13214 		while (uio->uio_resid > 0) {
13215 			/* How much room do we have? */
13216 			struct mbuf *new_tail, *mm;
13217 
13218 			if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13219 				max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13220 			else
13221 				max_len = 0;
13222 
13223 			if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13224 			    (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13225 			    (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13226 				sndout = 0;
13227 				new_tail = NULL;
13228 				if (hold_tcblock) {
13229 					SCTP_TCB_UNLOCK(stcb);
13230 					hold_tcblock = 0;
13231 				}
13232 				mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13233 				if ((mm == NULL) || error) {
13234 					if (mm) {
13235 						sctp_m_freem(mm);
13236 					}
13237 					goto out;
13238 				}
13239 				/* Update the mbuf and count */
13240 				SCTP_TCB_SEND_LOCK(stcb);
13241 				if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13242 					/*
13243 					 * we need to get out. Peer probably
13244 					 * aborted.
13245 					 */
13246 					sctp_m_freem(mm);
13247 					if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13248 						SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13249 						error = ECONNRESET;
13250 					}
13251 					SCTP_TCB_SEND_UNLOCK(stcb);
13252 					goto out;
13253 				}
13254 				if (sp->tail_mbuf) {
13255 					/* tack it to the end */
13256 					SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13257 					sp->tail_mbuf = new_tail;
13258 				} else {
13259 					/* A stolen mbuf */
13260 					sp->data = mm;
13261 					sp->tail_mbuf = new_tail;
13262 				}
13263 				sctp_snd_sb_alloc(stcb, sndout);
13264 				atomic_add_int(&sp->length, sndout);
13265 				len += sndout;
13266 				if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13267 					sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13268 				}
13269 				/* Did we reach EOR? */
13270 				if ((uio->uio_resid == 0) &&
13271 				    ((user_marks_eor == 0) ||
13272 				    (srcv->sinfo_flags & SCTP_EOF) ||
13273 				    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13274 					sp->msg_is_complete = 1;
13275 				} else {
13276 					sp->msg_is_complete = 0;
13277 				}
13278 				SCTP_TCB_SEND_UNLOCK(stcb);
13279 			}
13280 			if (uio->uio_resid == 0) {
13281 				/* got it all? */
13282 				continue;
13283 			}
13284 			/* PR-SCTP? */
13285 			if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13286 				/*
13287 				 * This is ugly but we must assure locking
13288 				 * order
13289 				 */
13290 				if (hold_tcblock == 0) {
13291 					SCTP_TCB_LOCK(stcb);
13292 					hold_tcblock = 1;
13293 				}
13294 				sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13295 				inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13296 				if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13297 					max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13298 				else
13299 					max_len = 0;
13300 				if (max_len > 0) {
13301 					continue;
13302 				}
13303 				SCTP_TCB_UNLOCK(stcb);
13304 				hold_tcblock = 0;
13305 			}
13306 			/* wait for space now */
13307 			if (non_blocking) {
13308 				/* Non-blocking io in place out */
13309 				goto skip_out_eof;
13310 			}
13311 			/* What about the INIT, send it maybe */
13312 			if (queue_only_for_init) {
13313 				if (hold_tcblock == 0) {
13314 					SCTP_TCB_LOCK(stcb);
13315 					hold_tcblock = 1;
13316 				}
13317 				if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13318 					/* a collision took us forward? */
13319 					queue_only = 0;
13320 				} else {
13321 					sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13322 					SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13323 					queue_only = 1;
13324 				}
13325 			}
13326 			if ((net->flight_size > net->cwnd) &&
13327 			    (asoc->sctp_cmt_on_off == 0)) {
13328 				SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13329 				queue_only = 1;
13330 			} else if (asoc->ifp_had_enobuf) {
13331 				SCTP_STAT_INCR(sctps_ifnomemqueued);
13332 				if (net->flight_size > (2 * net->mtu)) {
13333 					queue_only = 1;
13334 				}
13335 				asoc->ifp_had_enobuf = 0;
13336 			}
13337 			un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13338 			    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13339 			if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13340 			    (stcb->asoc.total_flight > 0) &&
13341 			    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13342 			    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13343 
13344 				/*-
13345 				 * Ok, Nagle is set on and we have data outstanding.
13346 				 * Don't send anything and let SACKs drive out the
13347 				 * data unless we have a "full" segment to send.
13348 				 */
13349 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13350 					sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13351 				}
13352 				SCTP_STAT_INCR(sctps_naglequeued);
13353 				nagle_applies = 1;
13354 			} else {
13355 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13356 					if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13357 						sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13358 				}
13359 				SCTP_STAT_INCR(sctps_naglesent);
13360 				nagle_applies = 0;
13361 			}
13362 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13363 
13364 				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13365 				    nagle_applies, un_sent);
13366 				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13367 				    stcb->asoc.total_flight,
13368 				    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13369 			}
13370 			if (queue_only_for_init)
13371 				queue_only_for_init = 0;
13372 			if ((queue_only == 0) && (nagle_applies == 0)) {
13373 				/*-
13374 				 * need to start chunk output
13375 				 * before blocking.. note that if
13376 				 * a lock is already applied, then
13377 				 * the input via the net is happening
13378 				 * and I don't need to start output :-D
13379 				 */
13380 				if (hold_tcblock == 0) {
13381 					if (SCTP_TCB_TRYLOCK(stcb)) {
13382 						hold_tcblock = 1;
13383 						sctp_chunk_output(inp,
13384 						    stcb,
13385 						    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13386 					}
13387 				} else {
13388 					sctp_chunk_output(inp,
13389 					    stcb,
13390 					    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13391 				}
13392 				if (hold_tcblock == 1) {
13393 					SCTP_TCB_UNLOCK(stcb);
13394 					hold_tcblock = 0;
13395 				}
13396 			}
13397 			SOCKBUF_LOCK(&so->so_snd);
13398 			/*-
13399 			 * This is a bit strange, but I think it will
13400 			 * work. The total_output_queue_size is locked and
13401 			 * protected by the TCB_LOCK, which we just released.
13402 			 * There is a race that can occur between releasing it
13403 			 * above, and me getting the socket lock, where sacks
13404 			 * come in but we have not put the SB_WAIT on the
13405 			 * so_snd buffer to get the wakeup. After the LOCK
13406 			 * is applied the sack_processing will also need to
13407 			 * LOCK the so->so_snd to do the actual sowwakeup(). So
13408 			 * once we have the socket buffer lock if we recheck the
13409 			 * size we KNOW we will get to sleep safely with the
13410 			 * wakeup flag in place.
13411 			 */
13412 			if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13413 			    min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13414 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13415 					sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13416 					    asoc, (size_t)uio->uio_resid);
13417 				}
13418 				be.error = 0;
13419 				stcb->block_entry = &be;
13420 				error = sbwait(&so->so_snd);
13421 				stcb->block_entry = NULL;
13422 
13423 				if (error || so->so_error || be.error) {
13424 					if (error == 0) {
13425 						if (so->so_error)
13426 							error = so->so_error;
13427 						if (be.error) {
13428 							error = be.error;
13429 						}
13430 					}
13431 					SOCKBUF_UNLOCK(&so->so_snd);
13432 					goto out_unlocked;
13433 				}
13434 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13435 					sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13436 					    asoc, stcb->asoc.total_output_queue_size);
13437 				}
13438 			}
13439 			SOCKBUF_UNLOCK(&so->so_snd);
13440 			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13441 				goto out_unlocked;
13442 			}
13443 		}
13444 		SCTP_TCB_SEND_LOCK(stcb);
13445 		if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13446 			SCTP_TCB_SEND_UNLOCK(stcb);
13447 			goto out_unlocked;
13448 		}
13449 		if (sp) {
13450 			if (sp->msg_is_complete == 0) {
13451 				strm->last_msg_incomplete = 1;
13452 				if (stcb->asoc.idata_supported == 0) {
13453 					asoc->stream_locked = 1;
13454 					asoc->stream_locked_on = srcv->sinfo_stream;
13455 				}
13456 			} else {
13457 				sp->sender_all_done = 1;
13458 				strm->last_msg_incomplete = 0;
13459 				asoc->stream_locked = 0;
13460 			}
13461 		} else {
13462 			SCTP_PRINTF("Huh no sp TSNH?\n");
13463 			strm->last_msg_incomplete = 0;
13464 			asoc->stream_locked = 0;
13465 		}
13466 		SCTP_TCB_SEND_UNLOCK(stcb);
13467 		if (uio->uio_resid == 0) {
13468 			got_all_of_the_send = 1;
13469 		}
13470 	} else {
13471 		/* We send in a 0, since we do NOT have any locks */
13472 		error = sctp_msg_append(stcb, net, top, srcv, 0);
13473 		top = NULL;
13474 		if (srcv->sinfo_flags & SCTP_EOF) {
13475 			/*
13476 			 * This should only happen for Panda for the mbuf
13477 			 * send case, which does NOT yet support EEOR mode.
13478 			 * Thus, we can just set this flag to do the proper
13479 			 * EOF handling.
13480 			 */
13481 			got_all_of_the_send = 1;
13482 		}
13483 	}
13484 	if (error) {
13485 		goto out;
13486 	}
13487 dataless_eof:
13488 	/* EOF thing ? */
13489 	if ((srcv->sinfo_flags & SCTP_EOF) &&
13490 	    (got_all_of_the_send == 1)) {
13491 		SCTP_STAT_INCR(sctps_sends_with_eof);
13492 		error = 0;
13493 		if (hold_tcblock == 0) {
13494 			SCTP_TCB_LOCK(stcb);
13495 			hold_tcblock = 1;
13496 		}
13497 		if (TAILQ_EMPTY(&asoc->send_queue) &&
13498 		    TAILQ_EMPTY(&asoc->sent_queue) &&
13499 		    sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13500 			if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13501 				goto abort_anyway;
13502 			}
13503 			/* there is nothing queued to send, so I'm done... */
13504 			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13505 			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13506 			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13507 				struct sctp_nets *netp;
13508 
13509 				/* only send SHUTDOWN the first time through */
13510 				if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13511 					SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13512 				}
13513 				SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13514 				SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13515 				sctp_stop_timers_for_shutdown(stcb);
13516 				if (stcb->asoc.alternate) {
13517 					netp = stcb->asoc.alternate;
13518 				} else {
13519 					netp = stcb->asoc.primary_destination;
13520 				}
13521 				sctp_send_shutdown(stcb, netp);
13522 				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13523 				    netp);
13524 				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13525 				    asoc->primary_destination);
13526 			}
13527 		} else {
13528 			/*-
13529 			 * we still got (or just got) data to send, so set
13530 			 * SHUTDOWN_PENDING
13531 			 */
13532 			/*-
13533 			 * XXX sockets draft says that SCTP_EOF should be
13534 			 * sent with no data.  currently, we will allow user
13535 			 * data to be sent first and move to
13536 			 * SHUTDOWN-PENDING
13537 			 */
13538 			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13539 			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13540 			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13541 				if (hold_tcblock == 0) {
13542 					SCTP_TCB_LOCK(stcb);
13543 					hold_tcblock = 1;
13544 				}
13545 				if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13546 					asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13547 				}
13548 				asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13549 				if (TAILQ_EMPTY(&asoc->send_queue) &&
13550 				    TAILQ_EMPTY(&asoc->sent_queue) &&
13551 				    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13552 					struct mbuf *op_err;
13553 					char msg[SCTP_DIAG_INFO_LEN];
13554 
13555 			abort_anyway:
13556 					if (free_cnt_applied) {
13557 						atomic_add_int(&stcb->asoc.refcnt, -1);
13558 						free_cnt_applied = 0;
13559 					}
13560 					snprintf(msg, sizeof(msg),
13561 					    "%s:%d at %s", __FILE__, __LINE__, __func__);
13562 					op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13563 					    msg);
13564 					sctp_abort_an_association(stcb->sctp_ep, stcb,
13565 					    op_err, SCTP_SO_LOCKED);
13566 					/*
13567 					 * now relock the stcb so everything
13568 					 * is sane
13569 					 */
13570 					hold_tcblock = 0;
13571 					stcb = NULL;
13572 					goto out;
13573 				}
13574 				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13575 				    asoc->primary_destination);
13576 				sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13577 			}
13578 		}
13579 	}
13580 skip_out_eof:
13581 	if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13582 		some_on_control = 1;
13583 	}
13584 	if (queue_only_for_init) {
13585 		if (hold_tcblock == 0) {
13586 			SCTP_TCB_LOCK(stcb);
13587 			hold_tcblock = 1;
13588 		}
13589 		if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13590 			/* a collision took us forward? */
13591 			queue_only = 0;
13592 		} else {
13593 			sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13594 			SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13595 			queue_only = 1;
13596 		}
13597 	}
13598 	if ((net->flight_size > net->cwnd) &&
13599 	    (stcb->asoc.sctp_cmt_on_off == 0)) {
13600 		SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13601 		queue_only = 1;
13602 	} else if (asoc->ifp_had_enobuf) {
13603 		SCTP_STAT_INCR(sctps_ifnomemqueued);
13604 		if (net->flight_size > (2 * net->mtu)) {
13605 			queue_only = 1;
13606 		}
13607 		asoc->ifp_had_enobuf = 0;
13608 	}
13609 	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13610 	    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13611 	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13612 	    (stcb->asoc.total_flight > 0) &&
13613 	    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13614 	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13615 		/*-
13616 		 * Ok, Nagle is set on and we have data outstanding.
13617 		 * Don't send anything and let SACKs drive out the
13618 		 * data unless wen have a "full" segment to send.
13619 		 */
13620 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13621 			sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13622 		}
13623 		SCTP_STAT_INCR(sctps_naglequeued);
13624 		nagle_applies = 1;
13625 	} else {
13626 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13627 			if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13628 				sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13629 		}
13630 		SCTP_STAT_INCR(sctps_naglesent);
13631 		nagle_applies = 0;
13632 	}
13633 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13634 		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13635 		    nagle_applies, un_sent);
13636 		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13637 		    stcb->asoc.total_flight,
13638 		    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13639 	}
13640 	if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13641 		/* we can attempt to send too. */
13642 		if (hold_tcblock == 0) {
13643 			/*
13644 			 * If there is activity recv'ing sacks no need to
13645 			 * send
13646 			 */
13647 			if (SCTP_TCB_TRYLOCK(stcb)) {
13648 				sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13649 				hold_tcblock = 1;
13650 			}
13651 		} else {
13652 			sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13653 		}
13654 	} else if ((queue_only == 0) &&
13655 		    (stcb->asoc.peers_rwnd == 0) &&
13656 	    (stcb->asoc.total_flight == 0)) {
13657 		/* We get to have a probe outstanding */
13658 		if (hold_tcblock == 0) {
13659 			hold_tcblock = 1;
13660 			SCTP_TCB_LOCK(stcb);
13661 		}
13662 		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13663 	} else if (some_on_control) {
13664 		int num_out, reason, frag_point;
13665 
13666 		/* Here we do control only */
13667 		if (hold_tcblock == 0) {
13668 			hold_tcblock = 1;
13669 			SCTP_TCB_LOCK(stcb);
13670 		}
13671 		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13672 		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13673 		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13674 	}
13675 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13676 	    queue_only, stcb->asoc.peers_rwnd, un_sent,
13677 	    stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13678 	    stcb->asoc.total_output_queue_size, error);
13679 
13680 out:
13681 out_unlocked:
13682 
13683 	if (local_soresv && stcb) {
13684 		atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13685 	}
13686 	if (create_lock_applied) {
13687 		SCTP_ASOC_CREATE_UNLOCK(inp);
13688 	}
13689 	if ((stcb) && hold_tcblock) {
13690 		SCTP_TCB_UNLOCK(stcb);
13691 	}
13692 	if (stcb && free_cnt_applied) {
13693 		atomic_add_int(&stcb->asoc.refcnt, -1);
13694 	}
13695 #ifdef INVARIANTS
13696 	if (stcb) {
13697 		if (mtx_owned(&stcb->tcb_mtx)) {
13698 			panic("Leaving with tcb mtx owned?");
13699 		}
13700 		if (mtx_owned(&stcb->tcb_send_mtx)) {
13701 			panic("Leaving with tcb send mtx owned?");
13702 		}
13703 	}
13704 #endif
13705 	if (top) {
13706 		sctp_m_freem(top);
13707 	}
13708 	if (control) {
13709 		sctp_m_freem(control);
13710 	}
13711 	return (error);
13712 }
13713 
13714 
13715 /*
13716  * generate an AUTHentication chunk, if required
13717  */
13718 struct mbuf *
13719 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13720     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13721     struct sctp_tcb *stcb, uint8_t chunk)
13722 {
13723 	struct mbuf *m_auth;
13724 	struct sctp_auth_chunk *auth;
13725 	int chunk_len;
13726 	struct mbuf *cn;
13727 
13728 	if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13729 	    (stcb == NULL))
13730 		return (m);
13731 
13732 	if (stcb->asoc.auth_supported == 0) {
13733 		return (m);
13734 	}
13735 	/* does the requested chunk require auth? */
13736 	if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13737 		return (m);
13738 	}
13739 	m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13740 	if (m_auth == NULL) {
13741 		/* no mbuf's */
13742 		return (m);
13743 	}
13744 	/* reserve some space if this will be the first mbuf */
13745 	if (m == NULL)
13746 		SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13747 	/* fill in the AUTH chunk details */
13748 	auth = mtod(m_auth, struct sctp_auth_chunk *);
13749 	bzero(auth, sizeof(*auth));
13750 	auth->ch.chunk_type = SCTP_AUTHENTICATION;
13751 	auth->ch.chunk_flags = 0;
13752 	chunk_len = sizeof(*auth) +
13753 	    sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13754 	auth->ch.chunk_length = htons(chunk_len);
13755 	auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13756 	/* key id and hmac digest will be computed and filled in upon send */
13757 
13758 	/* save the offset where the auth was inserted into the chain */
13759 	*offset = 0;
13760 	for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13761 		*offset += SCTP_BUF_LEN(cn);
13762 	}
13763 
13764 	/* update length and return pointer to the auth chunk */
13765 	SCTP_BUF_LEN(m_auth) = chunk_len;
13766 	m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13767 	if (auth_ret != NULL)
13768 		*auth_ret = auth;
13769 
13770 	return (m);
13771 }
13772 
13773 #ifdef INET6
13774 int
13775 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13776 {
13777 	struct nd_prefix *pfx = NULL;
13778 	struct nd_pfxrouter *pfxrtr = NULL;
13779 	struct sockaddr_in6 gw6;
13780 
13781 	if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13782 		return (0);
13783 
13784 	/* get prefix entry of address */
13785 	ND6_RLOCK();
13786 	LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13787 		if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13788 			continue;
13789 		if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13790 		    &src6->sin6_addr, &pfx->ndpr_mask))
13791 			break;
13792 	}
13793 	/* no prefix entry in the prefix list */
13794 	if (pfx == NULL) {
13795 		ND6_RUNLOCK();
13796 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13797 		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13798 		return (0);
13799 	}
13800 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13801 	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13802 
13803 	/* search installed gateway from prefix entry */
13804 	LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13805 		memset(&gw6, 0, sizeof(struct sockaddr_in6));
13806 		gw6.sin6_family = AF_INET6;
13807 		gw6.sin6_len = sizeof(struct sockaddr_in6);
13808 		memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13809 		    sizeof(struct in6_addr));
13810 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13811 		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13812 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13813 		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13814 		if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13815 			ND6_RUNLOCK();
13816 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13817 			return (1);
13818 		}
13819 	}
13820 	ND6_RUNLOCK();
13821 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13822 	return (0);
13823 }
13824 #endif
13825 
13826 int
13827 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13828 {
13829 #ifdef INET
13830 	struct sockaddr_in *sin, *mask;
13831 	struct ifaddr *ifa;
13832 	struct in_addr srcnetaddr, gwnetaddr;
13833 
13834 	if (ro == NULL || ro->ro_rt == NULL ||
13835 	    sifa->address.sa.sa_family != AF_INET) {
13836 		return (0);
13837 	}
13838 	ifa = (struct ifaddr *)sifa->ifa;
13839 	mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13840 	sin = &sifa->address.sin;
13841 	srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13842 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13843 	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13844 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13845 
13846 	sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13847 	gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13848 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13849 	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13850 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13851 	if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13852 		return (1);
13853 	}
13854 #endif
13855 	return (0);
13856 }
13857