xref: /freebsd/sys/netinet/sctp_output.c (revision 7750ad47a9a7dbc83f87158464170c8640723293)
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 #include <netinet/udp.h>
54 #include <netinet/udp_var.h>
55 #include <machine/in_cksum.h>
56 
57 
58 
59 #define SCTP_MAX_GAPS_INARRAY 4
60 struct sack_track {
61 	uint8_t right_edge;	/* mergable on the right edge */
62 	uint8_t left_edge;	/* mergable on the left edge */
63 	uint8_t num_entries;
64 	uint8_t spare;
65 	struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
66 };
67 
68 struct sack_track sack_array[256] = {
69 	{0, 0, 0, 0,		/* 0x00 */
70 		{{0, 0},
71 		{0, 0},
72 		{0, 0},
73 		{0, 0}
74 		}
75 	},
76 	{1, 0, 1, 0,		/* 0x01 */
77 		{{0, 0},
78 		{0, 0},
79 		{0, 0},
80 		{0, 0}
81 		}
82 	},
83 	{0, 0, 1, 0,		/* 0x02 */
84 		{{1, 1},
85 		{0, 0},
86 		{0, 0},
87 		{0, 0}
88 		}
89 	},
90 	{1, 0, 1, 0,		/* 0x03 */
91 		{{0, 1},
92 		{0, 0},
93 		{0, 0},
94 		{0, 0}
95 		}
96 	},
97 	{0, 0, 1, 0,		/* 0x04 */
98 		{{2, 2},
99 		{0, 0},
100 		{0, 0},
101 		{0, 0}
102 		}
103 	},
104 	{1, 0, 2, 0,		/* 0x05 */
105 		{{0, 0},
106 		{2, 2},
107 		{0, 0},
108 		{0, 0}
109 		}
110 	},
111 	{0, 0, 1, 0,		/* 0x06 */
112 		{{1, 2},
113 		{0, 0},
114 		{0, 0},
115 		{0, 0}
116 		}
117 	},
118 	{1, 0, 1, 0,		/* 0x07 */
119 		{{0, 2},
120 		{0, 0},
121 		{0, 0},
122 		{0, 0}
123 		}
124 	},
125 	{0, 0, 1, 0,		/* 0x08 */
126 		{{3, 3},
127 		{0, 0},
128 		{0, 0},
129 		{0, 0}
130 		}
131 	},
132 	{1, 0, 2, 0,		/* 0x09 */
133 		{{0, 0},
134 		{3, 3},
135 		{0, 0},
136 		{0, 0}
137 		}
138 	},
139 	{0, 0, 2, 0,		/* 0x0a */
140 		{{1, 1},
141 		{3, 3},
142 		{0, 0},
143 		{0, 0}
144 		}
145 	},
146 	{1, 0, 2, 0,		/* 0x0b */
147 		{{0, 1},
148 		{3, 3},
149 		{0, 0},
150 		{0, 0}
151 		}
152 	},
153 	{0, 0, 1, 0,		/* 0x0c */
154 		{{2, 3},
155 		{0, 0},
156 		{0, 0},
157 		{0, 0}
158 		}
159 	},
160 	{1, 0, 2, 0,		/* 0x0d */
161 		{{0, 0},
162 		{2, 3},
163 		{0, 0},
164 		{0, 0}
165 		}
166 	},
167 	{0, 0, 1, 0,		/* 0x0e */
168 		{{1, 3},
169 		{0, 0},
170 		{0, 0},
171 		{0, 0}
172 		}
173 	},
174 	{1, 0, 1, 0,		/* 0x0f */
175 		{{0, 3},
176 		{0, 0},
177 		{0, 0},
178 		{0, 0}
179 		}
180 	},
181 	{0, 0, 1, 0,		/* 0x10 */
182 		{{4, 4},
183 		{0, 0},
184 		{0, 0},
185 		{0, 0}
186 		}
187 	},
188 	{1, 0, 2, 0,		/* 0x11 */
189 		{{0, 0},
190 		{4, 4},
191 		{0, 0},
192 		{0, 0}
193 		}
194 	},
195 	{0, 0, 2, 0,		/* 0x12 */
196 		{{1, 1},
197 		{4, 4},
198 		{0, 0},
199 		{0, 0}
200 		}
201 	},
202 	{1, 0, 2, 0,		/* 0x13 */
203 		{{0, 1},
204 		{4, 4},
205 		{0, 0},
206 		{0, 0}
207 		}
208 	},
209 	{0, 0, 2, 0,		/* 0x14 */
210 		{{2, 2},
211 		{4, 4},
212 		{0, 0},
213 		{0, 0}
214 		}
215 	},
216 	{1, 0, 3, 0,		/* 0x15 */
217 		{{0, 0},
218 		{2, 2},
219 		{4, 4},
220 		{0, 0}
221 		}
222 	},
223 	{0, 0, 2, 0,		/* 0x16 */
224 		{{1, 2},
225 		{4, 4},
226 		{0, 0},
227 		{0, 0}
228 		}
229 	},
230 	{1, 0, 2, 0,		/* 0x17 */
231 		{{0, 2},
232 		{4, 4},
233 		{0, 0},
234 		{0, 0}
235 		}
236 	},
237 	{0, 0, 1, 0,		/* 0x18 */
238 		{{3, 4},
239 		{0, 0},
240 		{0, 0},
241 		{0, 0}
242 		}
243 	},
244 	{1, 0, 2, 0,		/* 0x19 */
245 		{{0, 0},
246 		{3, 4},
247 		{0, 0},
248 		{0, 0}
249 		}
250 	},
251 	{0, 0, 2, 0,		/* 0x1a */
252 		{{1, 1},
253 		{3, 4},
254 		{0, 0},
255 		{0, 0}
256 		}
257 	},
258 	{1, 0, 2, 0,		/* 0x1b */
259 		{{0, 1},
260 		{3, 4},
261 		{0, 0},
262 		{0, 0}
263 		}
264 	},
265 	{0, 0, 1, 0,		/* 0x1c */
266 		{{2, 4},
267 		{0, 0},
268 		{0, 0},
269 		{0, 0}
270 		}
271 	},
272 	{1, 0, 2, 0,		/* 0x1d */
273 		{{0, 0},
274 		{2, 4},
275 		{0, 0},
276 		{0, 0}
277 		}
278 	},
279 	{0, 0, 1, 0,		/* 0x1e */
280 		{{1, 4},
281 		{0, 0},
282 		{0, 0},
283 		{0, 0}
284 		}
285 	},
286 	{1, 0, 1, 0,		/* 0x1f */
287 		{{0, 4},
288 		{0, 0},
289 		{0, 0},
290 		{0, 0}
291 		}
292 	},
293 	{0, 0, 1, 0,		/* 0x20 */
294 		{{5, 5},
295 		{0, 0},
296 		{0, 0},
297 		{0, 0}
298 		}
299 	},
300 	{1, 0, 2, 0,		/* 0x21 */
301 		{{0, 0},
302 		{5, 5},
303 		{0, 0},
304 		{0, 0}
305 		}
306 	},
307 	{0, 0, 2, 0,		/* 0x22 */
308 		{{1, 1},
309 		{5, 5},
310 		{0, 0},
311 		{0, 0}
312 		}
313 	},
314 	{1, 0, 2, 0,		/* 0x23 */
315 		{{0, 1},
316 		{5, 5},
317 		{0, 0},
318 		{0, 0}
319 		}
320 	},
321 	{0, 0, 2, 0,		/* 0x24 */
322 		{{2, 2},
323 		{5, 5},
324 		{0, 0},
325 		{0, 0}
326 		}
327 	},
328 	{1, 0, 3, 0,		/* 0x25 */
329 		{{0, 0},
330 		{2, 2},
331 		{5, 5},
332 		{0, 0}
333 		}
334 	},
335 	{0, 0, 2, 0,		/* 0x26 */
336 		{{1, 2},
337 		{5, 5},
338 		{0, 0},
339 		{0, 0}
340 		}
341 	},
342 	{1, 0, 2, 0,		/* 0x27 */
343 		{{0, 2},
344 		{5, 5},
345 		{0, 0},
346 		{0, 0}
347 		}
348 	},
349 	{0, 0, 2, 0,		/* 0x28 */
350 		{{3, 3},
351 		{5, 5},
352 		{0, 0},
353 		{0, 0}
354 		}
355 	},
356 	{1, 0, 3, 0,		/* 0x29 */
357 		{{0, 0},
358 		{3, 3},
359 		{5, 5},
360 		{0, 0}
361 		}
362 	},
363 	{0, 0, 3, 0,		/* 0x2a */
364 		{{1, 1},
365 		{3, 3},
366 		{5, 5},
367 		{0, 0}
368 		}
369 	},
370 	{1, 0, 3, 0,		/* 0x2b */
371 		{{0, 1},
372 		{3, 3},
373 		{5, 5},
374 		{0, 0}
375 		}
376 	},
377 	{0, 0, 2, 0,		/* 0x2c */
378 		{{2, 3},
379 		{5, 5},
380 		{0, 0},
381 		{0, 0}
382 		}
383 	},
384 	{1, 0, 3, 0,		/* 0x2d */
385 		{{0, 0},
386 		{2, 3},
387 		{5, 5},
388 		{0, 0}
389 		}
390 	},
391 	{0, 0, 2, 0,		/* 0x2e */
392 		{{1, 3},
393 		{5, 5},
394 		{0, 0},
395 		{0, 0}
396 		}
397 	},
398 	{1, 0, 2, 0,		/* 0x2f */
399 		{{0, 3},
400 		{5, 5},
401 		{0, 0},
402 		{0, 0}
403 		}
404 	},
405 	{0, 0, 1, 0,		/* 0x30 */
406 		{{4, 5},
407 		{0, 0},
408 		{0, 0},
409 		{0, 0}
410 		}
411 	},
412 	{1, 0, 2, 0,		/* 0x31 */
413 		{{0, 0},
414 		{4, 5},
415 		{0, 0},
416 		{0, 0}
417 		}
418 	},
419 	{0, 0, 2, 0,		/* 0x32 */
420 		{{1, 1},
421 		{4, 5},
422 		{0, 0},
423 		{0, 0}
424 		}
425 	},
426 	{1, 0, 2, 0,		/* 0x33 */
427 		{{0, 1},
428 		{4, 5},
429 		{0, 0},
430 		{0, 0}
431 		}
432 	},
433 	{0, 0, 2, 0,		/* 0x34 */
434 		{{2, 2},
435 		{4, 5},
436 		{0, 0},
437 		{0, 0}
438 		}
439 	},
440 	{1, 0, 3, 0,		/* 0x35 */
441 		{{0, 0},
442 		{2, 2},
443 		{4, 5},
444 		{0, 0}
445 		}
446 	},
447 	{0, 0, 2, 0,		/* 0x36 */
448 		{{1, 2},
449 		{4, 5},
450 		{0, 0},
451 		{0, 0}
452 		}
453 	},
454 	{1, 0, 2, 0,		/* 0x37 */
455 		{{0, 2},
456 		{4, 5},
457 		{0, 0},
458 		{0, 0}
459 		}
460 	},
461 	{0, 0, 1, 0,		/* 0x38 */
462 		{{3, 5},
463 		{0, 0},
464 		{0, 0},
465 		{0, 0}
466 		}
467 	},
468 	{1, 0, 2, 0,		/* 0x39 */
469 		{{0, 0},
470 		{3, 5},
471 		{0, 0},
472 		{0, 0}
473 		}
474 	},
475 	{0, 0, 2, 0,		/* 0x3a */
476 		{{1, 1},
477 		{3, 5},
478 		{0, 0},
479 		{0, 0}
480 		}
481 	},
482 	{1, 0, 2, 0,		/* 0x3b */
483 		{{0, 1},
484 		{3, 5},
485 		{0, 0},
486 		{0, 0}
487 		}
488 	},
489 	{0, 0, 1, 0,		/* 0x3c */
490 		{{2, 5},
491 		{0, 0},
492 		{0, 0},
493 		{0, 0}
494 		}
495 	},
496 	{1, 0, 2, 0,		/* 0x3d */
497 		{{0, 0},
498 		{2, 5},
499 		{0, 0},
500 		{0, 0}
501 		}
502 	},
503 	{0, 0, 1, 0,		/* 0x3e */
504 		{{1, 5},
505 		{0, 0},
506 		{0, 0},
507 		{0, 0}
508 		}
509 	},
510 	{1, 0, 1, 0,		/* 0x3f */
511 		{{0, 5},
512 		{0, 0},
513 		{0, 0},
514 		{0, 0}
515 		}
516 	},
517 	{0, 0, 1, 0,		/* 0x40 */
518 		{{6, 6},
519 		{0, 0},
520 		{0, 0},
521 		{0, 0}
522 		}
523 	},
524 	{1, 0, 2, 0,		/* 0x41 */
525 		{{0, 0},
526 		{6, 6},
527 		{0, 0},
528 		{0, 0}
529 		}
530 	},
531 	{0, 0, 2, 0,		/* 0x42 */
532 		{{1, 1},
533 		{6, 6},
534 		{0, 0},
535 		{0, 0}
536 		}
537 	},
538 	{1, 0, 2, 0,		/* 0x43 */
539 		{{0, 1},
540 		{6, 6},
541 		{0, 0},
542 		{0, 0}
543 		}
544 	},
545 	{0, 0, 2, 0,		/* 0x44 */
546 		{{2, 2},
547 		{6, 6},
548 		{0, 0},
549 		{0, 0}
550 		}
551 	},
552 	{1, 0, 3, 0,		/* 0x45 */
553 		{{0, 0},
554 		{2, 2},
555 		{6, 6},
556 		{0, 0}
557 		}
558 	},
559 	{0, 0, 2, 0,		/* 0x46 */
560 		{{1, 2},
561 		{6, 6},
562 		{0, 0},
563 		{0, 0}
564 		}
565 	},
566 	{1, 0, 2, 0,		/* 0x47 */
567 		{{0, 2},
568 		{6, 6},
569 		{0, 0},
570 		{0, 0}
571 		}
572 	},
573 	{0, 0, 2, 0,		/* 0x48 */
574 		{{3, 3},
575 		{6, 6},
576 		{0, 0},
577 		{0, 0}
578 		}
579 	},
580 	{1, 0, 3, 0,		/* 0x49 */
581 		{{0, 0},
582 		{3, 3},
583 		{6, 6},
584 		{0, 0}
585 		}
586 	},
587 	{0, 0, 3, 0,		/* 0x4a */
588 		{{1, 1},
589 		{3, 3},
590 		{6, 6},
591 		{0, 0}
592 		}
593 	},
594 	{1, 0, 3, 0,		/* 0x4b */
595 		{{0, 1},
596 		{3, 3},
597 		{6, 6},
598 		{0, 0}
599 		}
600 	},
601 	{0, 0, 2, 0,		/* 0x4c */
602 		{{2, 3},
603 		{6, 6},
604 		{0, 0},
605 		{0, 0}
606 		}
607 	},
608 	{1, 0, 3, 0,		/* 0x4d */
609 		{{0, 0},
610 		{2, 3},
611 		{6, 6},
612 		{0, 0}
613 		}
614 	},
615 	{0, 0, 2, 0,		/* 0x4e */
616 		{{1, 3},
617 		{6, 6},
618 		{0, 0},
619 		{0, 0}
620 		}
621 	},
622 	{1, 0, 2, 0,		/* 0x4f */
623 		{{0, 3},
624 		{6, 6},
625 		{0, 0},
626 		{0, 0}
627 		}
628 	},
629 	{0, 0, 2, 0,		/* 0x50 */
630 		{{4, 4},
631 		{6, 6},
632 		{0, 0},
633 		{0, 0}
634 		}
635 	},
636 	{1, 0, 3, 0,		/* 0x51 */
637 		{{0, 0},
638 		{4, 4},
639 		{6, 6},
640 		{0, 0}
641 		}
642 	},
643 	{0, 0, 3, 0,		/* 0x52 */
644 		{{1, 1},
645 		{4, 4},
646 		{6, 6},
647 		{0, 0}
648 		}
649 	},
650 	{1, 0, 3, 0,		/* 0x53 */
651 		{{0, 1},
652 		{4, 4},
653 		{6, 6},
654 		{0, 0}
655 		}
656 	},
657 	{0, 0, 3, 0,		/* 0x54 */
658 		{{2, 2},
659 		{4, 4},
660 		{6, 6},
661 		{0, 0}
662 		}
663 	},
664 	{1, 0, 4, 0,		/* 0x55 */
665 		{{0, 0},
666 		{2, 2},
667 		{4, 4},
668 		{6, 6}
669 		}
670 	},
671 	{0, 0, 3, 0,		/* 0x56 */
672 		{{1, 2},
673 		{4, 4},
674 		{6, 6},
675 		{0, 0}
676 		}
677 	},
678 	{1, 0, 3, 0,		/* 0x57 */
679 		{{0, 2},
680 		{4, 4},
681 		{6, 6},
682 		{0, 0}
683 		}
684 	},
685 	{0, 0, 2, 0,		/* 0x58 */
686 		{{3, 4},
687 		{6, 6},
688 		{0, 0},
689 		{0, 0}
690 		}
691 	},
692 	{1, 0, 3, 0,		/* 0x59 */
693 		{{0, 0},
694 		{3, 4},
695 		{6, 6},
696 		{0, 0}
697 		}
698 	},
699 	{0, 0, 3, 0,		/* 0x5a */
700 		{{1, 1},
701 		{3, 4},
702 		{6, 6},
703 		{0, 0}
704 		}
705 	},
706 	{1, 0, 3, 0,		/* 0x5b */
707 		{{0, 1},
708 		{3, 4},
709 		{6, 6},
710 		{0, 0}
711 		}
712 	},
713 	{0, 0, 2, 0,		/* 0x5c */
714 		{{2, 4},
715 		{6, 6},
716 		{0, 0},
717 		{0, 0}
718 		}
719 	},
720 	{1, 0, 3, 0,		/* 0x5d */
721 		{{0, 0},
722 		{2, 4},
723 		{6, 6},
724 		{0, 0}
725 		}
726 	},
727 	{0, 0, 2, 0,		/* 0x5e */
728 		{{1, 4},
729 		{6, 6},
730 		{0, 0},
731 		{0, 0}
732 		}
733 	},
734 	{1, 0, 2, 0,		/* 0x5f */
735 		{{0, 4},
736 		{6, 6},
737 		{0, 0},
738 		{0, 0}
739 		}
740 	},
741 	{0, 0, 1, 0,		/* 0x60 */
742 		{{5, 6},
743 		{0, 0},
744 		{0, 0},
745 		{0, 0}
746 		}
747 	},
748 	{1, 0, 2, 0,		/* 0x61 */
749 		{{0, 0},
750 		{5, 6},
751 		{0, 0},
752 		{0, 0}
753 		}
754 	},
755 	{0, 0, 2, 0,		/* 0x62 */
756 		{{1, 1},
757 		{5, 6},
758 		{0, 0},
759 		{0, 0}
760 		}
761 	},
762 	{1, 0, 2, 0,		/* 0x63 */
763 		{{0, 1},
764 		{5, 6},
765 		{0, 0},
766 		{0, 0}
767 		}
768 	},
769 	{0, 0, 2, 0,		/* 0x64 */
770 		{{2, 2},
771 		{5, 6},
772 		{0, 0},
773 		{0, 0}
774 		}
775 	},
776 	{1, 0, 3, 0,		/* 0x65 */
777 		{{0, 0},
778 		{2, 2},
779 		{5, 6},
780 		{0, 0}
781 		}
782 	},
783 	{0, 0, 2, 0,		/* 0x66 */
784 		{{1, 2},
785 		{5, 6},
786 		{0, 0},
787 		{0, 0}
788 		}
789 	},
790 	{1, 0, 2, 0,		/* 0x67 */
791 		{{0, 2},
792 		{5, 6},
793 		{0, 0},
794 		{0, 0}
795 		}
796 	},
797 	{0, 0, 2, 0,		/* 0x68 */
798 		{{3, 3},
799 		{5, 6},
800 		{0, 0},
801 		{0, 0}
802 		}
803 	},
804 	{1, 0, 3, 0,		/* 0x69 */
805 		{{0, 0},
806 		{3, 3},
807 		{5, 6},
808 		{0, 0}
809 		}
810 	},
811 	{0, 0, 3, 0,		/* 0x6a */
812 		{{1, 1},
813 		{3, 3},
814 		{5, 6},
815 		{0, 0}
816 		}
817 	},
818 	{1, 0, 3, 0,		/* 0x6b */
819 		{{0, 1},
820 		{3, 3},
821 		{5, 6},
822 		{0, 0}
823 		}
824 	},
825 	{0, 0, 2, 0,		/* 0x6c */
826 		{{2, 3},
827 		{5, 6},
828 		{0, 0},
829 		{0, 0}
830 		}
831 	},
832 	{1, 0, 3, 0,		/* 0x6d */
833 		{{0, 0},
834 		{2, 3},
835 		{5, 6},
836 		{0, 0}
837 		}
838 	},
839 	{0, 0, 2, 0,		/* 0x6e */
840 		{{1, 3},
841 		{5, 6},
842 		{0, 0},
843 		{0, 0}
844 		}
845 	},
846 	{1, 0, 2, 0,		/* 0x6f */
847 		{{0, 3},
848 		{5, 6},
849 		{0, 0},
850 		{0, 0}
851 		}
852 	},
853 	{0, 0, 1, 0,		/* 0x70 */
854 		{{4, 6},
855 		{0, 0},
856 		{0, 0},
857 		{0, 0}
858 		}
859 	},
860 	{1, 0, 2, 0,		/* 0x71 */
861 		{{0, 0},
862 		{4, 6},
863 		{0, 0},
864 		{0, 0}
865 		}
866 	},
867 	{0, 0, 2, 0,		/* 0x72 */
868 		{{1, 1},
869 		{4, 6},
870 		{0, 0},
871 		{0, 0}
872 		}
873 	},
874 	{1, 0, 2, 0,		/* 0x73 */
875 		{{0, 1},
876 		{4, 6},
877 		{0, 0},
878 		{0, 0}
879 		}
880 	},
881 	{0, 0, 2, 0,		/* 0x74 */
882 		{{2, 2},
883 		{4, 6},
884 		{0, 0},
885 		{0, 0}
886 		}
887 	},
888 	{1, 0, 3, 0,		/* 0x75 */
889 		{{0, 0},
890 		{2, 2},
891 		{4, 6},
892 		{0, 0}
893 		}
894 	},
895 	{0, 0, 2, 0,		/* 0x76 */
896 		{{1, 2},
897 		{4, 6},
898 		{0, 0},
899 		{0, 0}
900 		}
901 	},
902 	{1, 0, 2, 0,		/* 0x77 */
903 		{{0, 2},
904 		{4, 6},
905 		{0, 0},
906 		{0, 0}
907 		}
908 	},
909 	{0, 0, 1, 0,		/* 0x78 */
910 		{{3, 6},
911 		{0, 0},
912 		{0, 0},
913 		{0, 0}
914 		}
915 	},
916 	{1, 0, 2, 0,		/* 0x79 */
917 		{{0, 0},
918 		{3, 6},
919 		{0, 0},
920 		{0, 0}
921 		}
922 	},
923 	{0, 0, 2, 0,		/* 0x7a */
924 		{{1, 1},
925 		{3, 6},
926 		{0, 0},
927 		{0, 0}
928 		}
929 	},
930 	{1, 0, 2, 0,		/* 0x7b */
931 		{{0, 1},
932 		{3, 6},
933 		{0, 0},
934 		{0, 0}
935 		}
936 	},
937 	{0, 0, 1, 0,		/* 0x7c */
938 		{{2, 6},
939 		{0, 0},
940 		{0, 0},
941 		{0, 0}
942 		}
943 	},
944 	{1, 0, 2, 0,		/* 0x7d */
945 		{{0, 0},
946 		{2, 6},
947 		{0, 0},
948 		{0, 0}
949 		}
950 	},
951 	{0, 0, 1, 0,		/* 0x7e */
952 		{{1, 6},
953 		{0, 0},
954 		{0, 0},
955 		{0, 0}
956 		}
957 	},
958 	{1, 0, 1, 0,		/* 0x7f */
959 		{{0, 6},
960 		{0, 0},
961 		{0, 0},
962 		{0, 0}
963 		}
964 	},
965 	{0, 1, 1, 0,		/* 0x80 */
966 		{{7, 7},
967 		{0, 0},
968 		{0, 0},
969 		{0, 0}
970 		}
971 	},
972 	{1, 1, 2, 0,		/* 0x81 */
973 		{{0, 0},
974 		{7, 7},
975 		{0, 0},
976 		{0, 0}
977 		}
978 	},
979 	{0, 1, 2, 0,		/* 0x82 */
980 		{{1, 1},
981 		{7, 7},
982 		{0, 0},
983 		{0, 0}
984 		}
985 	},
986 	{1, 1, 2, 0,		/* 0x83 */
987 		{{0, 1},
988 		{7, 7},
989 		{0, 0},
990 		{0, 0}
991 		}
992 	},
993 	{0, 1, 2, 0,		/* 0x84 */
994 		{{2, 2},
995 		{7, 7},
996 		{0, 0},
997 		{0, 0}
998 		}
999 	},
1000 	{1, 1, 3, 0,		/* 0x85 */
1001 		{{0, 0},
1002 		{2, 2},
1003 		{7, 7},
1004 		{0, 0}
1005 		}
1006 	},
1007 	{0, 1, 2, 0,		/* 0x86 */
1008 		{{1, 2},
1009 		{7, 7},
1010 		{0, 0},
1011 		{0, 0}
1012 		}
1013 	},
1014 	{1, 1, 2, 0,		/* 0x87 */
1015 		{{0, 2},
1016 		{7, 7},
1017 		{0, 0},
1018 		{0, 0}
1019 		}
1020 	},
1021 	{0, 1, 2, 0,		/* 0x88 */
1022 		{{3, 3},
1023 		{7, 7},
1024 		{0, 0},
1025 		{0, 0}
1026 		}
1027 	},
1028 	{1, 1, 3, 0,		/* 0x89 */
1029 		{{0, 0},
1030 		{3, 3},
1031 		{7, 7},
1032 		{0, 0}
1033 		}
1034 	},
1035 	{0, 1, 3, 0,		/* 0x8a */
1036 		{{1, 1},
1037 		{3, 3},
1038 		{7, 7},
1039 		{0, 0}
1040 		}
1041 	},
1042 	{1, 1, 3, 0,		/* 0x8b */
1043 		{{0, 1},
1044 		{3, 3},
1045 		{7, 7},
1046 		{0, 0}
1047 		}
1048 	},
1049 	{0, 1, 2, 0,		/* 0x8c */
1050 		{{2, 3},
1051 		{7, 7},
1052 		{0, 0},
1053 		{0, 0}
1054 		}
1055 	},
1056 	{1, 1, 3, 0,		/* 0x8d */
1057 		{{0, 0},
1058 		{2, 3},
1059 		{7, 7},
1060 		{0, 0}
1061 		}
1062 	},
1063 	{0, 1, 2, 0,		/* 0x8e */
1064 		{{1, 3},
1065 		{7, 7},
1066 		{0, 0},
1067 		{0, 0}
1068 		}
1069 	},
1070 	{1, 1, 2, 0,		/* 0x8f */
1071 		{{0, 3},
1072 		{7, 7},
1073 		{0, 0},
1074 		{0, 0}
1075 		}
1076 	},
1077 	{0, 1, 2, 0,		/* 0x90 */
1078 		{{4, 4},
1079 		{7, 7},
1080 		{0, 0},
1081 		{0, 0}
1082 		}
1083 	},
1084 	{1, 1, 3, 0,		/* 0x91 */
1085 		{{0, 0},
1086 		{4, 4},
1087 		{7, 7},
1088 		{0, 0}
1089 		}
1090 	},
1091 	{0, 1, 3, 0,		/* 0x92 */
1092 		{{1, 1},
1093 		{4, 4},
1094 		{7, 7},
1095 		{0, 0}
1096 		}
1097 	},
1098 	{1, 1, 3, 0,		/* 0x93 */
1099 		{{0, 1},
1100 		{4, 4},
1101 		{7, 7},
1102 		{0, 0}
1103 		}
1104 	},
1105 	{0, 1, 3, 0,		/* 0x94 */
1106 		{{2, 2},
1107 		{4, 4},
1108 		{7, 7},
1109 		{0, 0}
1110 		}
1111 	},
1112 	{1, 1, 4, 0,		/* 0x95 */
1113 		{{0, 0},
1114 		{2, 2},
1115 		{4, 4},
1116 		{7, 7}
1117 		}
1118 	},
1119 	{0, 1, 3, 0,		/* 0x96 */
1120 		{{1, 2},
1121 		{4, 4},
1122 		{7, 7},
1123 		{0, 0}
1124 		}
1125 	},
1126 	{1, 1, 3, 0,		/* 0x97 */
1127 		{{0, 2},
1128 		{4, 4},
1129 		{7, 7},
1130 		{0, 0}
1131 		}
1132 	},
1133 	{0, 1, 2, 0,		/* 0x98 */
1134 		{{3, 4},
1135 		{7, 7},
1136 		{0, 0},
1137 		{0, 0}
1138 		}
1139 	},
1140 	{1, 1, 3, 0,		/* 0x99 */
1141 		{{0, 0},
1142 		{3, 4},
1143 		{7, 7},
1144 		{0, 0}
1145 		}
1146 	},
1147 	{0, 1, 3, 0,		/* 0x9a */
1148 		{{1, 1},
1149 		{3, 4},
1150 		{7, 7},
1151 		{0, 0}
1152 		}
1153 	},
1154 	{1, 1, 3, 0,		/* 0x9b */
1155 		{{0, 1},
1156 		{3, 4},
1157 		{7, 7},
1158 		{0, 0}
1159 		}
1160 	},
1161 	{0, 1, 2, 0,		/* 0x9c */
1162 		{{2, 4},
1163 		{7, 7},
1164 		{0, 0},
1165 		{0, 0}
1166 		}
1167 	},
1168 	{1, 1, 3, 0,		/* 0x9d */
1169 		{{0, 0},
1170 		{2, 4},
1171 		{7, 7},
1172 		{0, 0}
1173 		}
1174 	},
1175 	{0, 1, 2, 0,		/* 0x9e */
1176 		{{1, 4},
1177 		{7, 7},
1178 		{0, 0},
1179 		{0, 0}
1180 		}
1181 	},
1182 	{1, 1, 2, 0,		/* 0x9f */
1183 		{{0, 4},
1184 		{7, 7},
1185 		{0, 0},
1186 		{0, 0}
1187 		}
1188 	},
1189 	{0, 1, 2, 0,		/* 0xa0 */
1190 		{{5, 5},
1191 		{7, 7},
1192 		{0, 0},
1193 		{0, 0}
1194 		}
1195 	},
1196 	{1, 1, 3, 0,		/* 0xa1 */
1197 		{{0, 0},
1198 		{5, 5},
1199 		{7, 7},
1200 		{0, 0}
1201 		}
1202 	},
1203 	{0, 1, 3, 0,		/* 0xa2 */
1204 		{{1, 1},
1205 		{5, 5},
1206 		{7, 7},
1207 		{0, 0}
1208 		}
1209 	},
1210 	{1, 1, 3, 0,		/* 0xa3 */
1211 		{{0, 1},
1212 		{5, 5},
1213 		{7, 7},
1214 		{0, 0}
1215 		}
1216 	},
1217 	{0, 1, 3, 0,		/* 0xa4 */
1218 		{{2, 2},
1219 		{5, 5},
1220 		{7, 7},
1221 		{0, 0}
1222 		}
1223 	},
1224 	{1, 1, 4, 0,		/* 0xa5 */
1225 		{{0, 0},
1226 		{2, 2},
1227 		{5, 5},
1228 		{7, 7}
1229 		}
1230 	},
1231 	{0, 1, 3, 0,		/* 0xa6 */
1232 		{{1, 2},
1233 		{5, 5},
1234 		{7, 7},
1235 		{0, 0}
1236 		}
1237 	},
1238 	{1, 1, 3, 0,		/* 0xa7 */
1239 		{{0, 2},
1240 		{5, 5},
1241 		{7, 7},
1242 		{0, 0}
1243 		}
1244 	},
1245 	{0, 1, 3, 0,		/* 0xa8 */
1246 		{{3, 3},
1247 		{5, 5},
1248 		{7, 7},
1249 		{0, 0}
1250 		}
1251 	},
1252 	{1, 1, 4, 0,		/* 0xa9 */
1253 		{{0, 0},
1254 		{3, 3},
1255 		{5, 5},
1256 		{7, 7}
1257 		}
1258 	},
1259 	{0, 1, 4, 0,		/* 0xaa */
1260 		{{1, 1},
1261 		{3, 3},
1262 		{5, 5},
1263 		{7, 7}
1264 		}
1265 	},
1266 	{1, 1, 4, 0,		/* 0xab */
1267 		{{0, 1},
1268 		{3, 3},
1269 		{5, 5},
1270 		{7, 7}
1271 		}
1272 	},
1273 	{0, 1, 3, 0,		/* 0xac */
1274 		{{2, 3},
1275 		{5, 5},
1276 		{7, 7},
1277 		{0, 0}
1278 		}
1279 	},
1280 	{1, 1, 4, 0,		/* 0xad */
1281 		{{0, 0},
1282 		{2, 3},
1283 		{5, 5},
1284 		{7, 7}
1285 		}
1286 	},
1287 	{0, 1, 3, 0,		/* 0xae */
1288 		{{1, 3},
1289 		{5, 5},
1290 		{7, 7},
1291 		{0, 0}
1292 		}
1293 	},
1294 	{1, 1, 3, 0,		/* 0xaf */
1295 		{{0, 3},
1296 		{5, 5},
1297 		{7, 7},
1298 		{0, 0}
1299 		}
1300 	},
1301 	{0, 1, 2, 0,		/* 0xb0 */
1302 		{{4, 5},
1303 		{7, 7},
1304 		{0, 0},
1305 		{0, 0}
1306 		}
1307 	},
1308 	{1, 1, 3, 0,		/* 0xb1 */
1309 		{{0, 0},
1310 		{4, 5},
1311 		{7, 7},
1312 		{0, 0}
1313 		}
1314 	},
1315 	{0, 1, 3, 0,		/* 0xb2 */
1316 		{{1, 1},
1317 		{4, 5},
1318 		{7, 7},
1319 		{0, 0}
1320 		}
1321 	},
1322 	{1, 1, 3, 0,		/* 0xb3 */
1323 		{{0, 1},
1324 		{4, 5},
1325 		{7, 7},
1326 		{0, 0}
1327 		}
1328 	},
1329 	{0, 1, 3, 0,		/* 0xb4 */
1330 		{{2, 2},
1331 		{4, 5},
1332 		{7, 7},
1333 		{0, 0}
1334 		}
1335 	},
1336 	{1, 1, 4, 0,		/* 0xb5 */
1337 		{{0, 0},
1338 		{2, 2},
1339 		{4, 5},
1340 		{7, 7}
1341 		}
1342 	},
1343 	{0, 1, 3, 0,		/* 0xb6 */
1344 		{{1, 2},
1345 		{4, 5},
1346 		{7, 7},
1347 		{0, 0}
1348 		}
1349 	},
1350 	{1, 1, 3, 0,		/* 0xb7 */
1351 		{{0, 2},
1352 		{4, 5},
1353 		{7, 7},
1354 		{0, 0}
1355 		}
1356 	},
1357 	{0, 1, 2, 0,		/* 0xb8 */
1358 		{{3, 5},
1359 		{7, 7},
1360 		{0, 0},
1361 		{0, 0}
1362 		}
1363 	},
1364 	{1, 1, 3, 0,		/* 0xb9 */
1365 		{{0, 0},
1366 		{3, 5},
1367 		{7, 7},
1368 		{0, 0}
1369 		}
1370 	},
1371 	{0, 1, 3, 0,		/* 0xba */
1372 		{{1, 1},
1373 		{3, 5},
1374 		{7, 7},
1375 		{0, 0}
1376 		}
1377 	},
1378 	{1, 1, 3, 0,		/* 0xbb */
1379 		{{0, 1},
1380 		{3, 5},
1381 		{7, 7},
1382 		{0, 0}
1383 		}
1384 	},
1385 	{0, 1, 2, 0,		/* 0xbc */
1386 		{{2, 5},
1387 		{7, 7},
1388 		{0, 0},
1389 		{0, 0}
1390 		}
1391 	},
1392 	{1, 1, 3, 0,		/* 0xbd */
1393 		{{0, 0},
1394 		{2, 5},
1395 		{7, 7},
1396 		{0, 0}
1397 		}
1398 	},
1399 	{0, 1, 2, 0,		/* 0xbe */
1400 		{{1, 5},
1401 		{7, 7},
1402 		{0, 0},
1403 		{0, 0}
1404 		}
1405 	},
1406 	{1, 1, 2, 0,		/* 0xbf */
1407 		{{0, 5},
1408 		{7, 7},
1409 		{0, 0},
1410 		{0, 0}
1411 		}
1412 	},
1413 	{0, 1, 1, 0,		/* 0xc0 */
1414 		{{6, 7},
1415 		{0, 0},
1416 		{0, 0},
1417 		{0, 0}
1418 		}
1419 	},
1420 	{1, 1, 2, 0,		/* 0xc1 */
1421 		{{0, 0},
1422 		{6, 7},
1423 		{0, 0},
1424 		{0, 0}
1425 		}
1426 	},
1427 	{0, 1, 2, 0,		/* 0xc2 */
1428 		{{1, 1},
1429 		{6, 7},
1430 		{0, 0},
1431 		{0, 0}
1432 		}
1433 	},
1434 	{1, 1, 2, 0,		/* 0xc3 */
1435 		{{0, 1},
1436 		{6, 7},
1437 		{0, 0},
1438 		{0, 0}
1439 		}
1440 	},
1441 	{0, 1, 2, 0,		/* 0xc4 */
1442 		{{2, 2},
1443 		{6, 7},
1444 		{0, 0},
1445 		{0, 0}
1446 		}
1447 	},
1448 	{1, 1, 3, 0,		/* 0xc5 */
1449 		{{0, 0},
1450 		{2, 2},
1451 		{6, 7},
1452 		{0, 0}
1453 		}
1454 	},
1455 	{0, 1, 2, 0,		/* 0xc6 */
1456 		{{1, 2},
1457 		{6, 7},
1458 		{0, 0},
1459 		{0, 0}
1460 		}
1461 	},
1462 	{1, 1, 2, 0,		/* 0xc7 */
1463 		{{0, 2},
1464 		{6, 7},
1465 		{0, 0},
1466 		{0, 0}
1467 		}
1468 	},
1469 	{0, 1, 2, 0,		/* 0xc8 */
1470 		{{3, 3},
1471 		{6, 7},
1472 		{0, 0},
1473 		{0, 0}
1474 		}
1475 	},
1476 	{1, 1, 3, 0,		/* 0xc9 */
1477 		{{0, 0},
1478 		{3, 3},
1479 		{6, 7},
1480 		{0, 0}
1481 		}
1482 	},
1483 	{0, 1, 3, 0,		/* 0xca */
1484 		{{1, 1},
1485 		{3, 3},
1486 		{6, 7},
1487 		{0, 0}
1488 		}
1489 	},
1490 	{1, 1, 3, 0,		/* 0xcb */
1491 		{{0, 1},
1492 		{3, 3},
1493 		{6, 7},
1494 		{0, 0}
1495 		}
1496 	},
1497 	{0, 1, 2, 0,		/* 0xcc */
1498 		{{2, 3},
1499 		{6, 7},
1500 		{0, 0},
1501 		{0, 0}
1502 		}
1503 	},
1504 	{1, 1, 3, 0,		/* 0xcd */
1505 		{{0, 0},
1506 		{2, 3},
1507 		{6, 7},
1508 		{0, 0}
1509 		}
1510 	},
1511 	{0, 1, 2, 0,		/* 0xce */
1512 		{{1, 3},
1513 		{6, 7},
1514 		{0, 0},
1515 		{0, 0}
1516 		}
1517 	},
1518 	{1, 1, 2, 0,		/* 0xcf */
1519 		{{0, 3},
1520 		{6, 7},
1521 		{0, 0},
1522 		{0, 0}
1523 		}
1524 	},
1525 	{0, 1, 2, 0,		/* 0xd0 */
1526 		{{4, 4},
1527 		{6, 7},
1528 		{0, 0},
1529 		{0, 0}
1530 		}
1531 	},
1532 	{1, 1, 3, 0,		/* 0xd1 */
1533 		{{0, 0},
1534 		{4, 4},
1535 		{6, 7},
1536 		{0, 0}
1537 		}
1538 	},
1539 	{0, 1, 3, 0,		/* 0xd2 */
1540 		{{1, 1},
1541 		{4, 4},
1542 		{6, 7},
1543 		{0, 0}
1544 		}
1545 	},
1546 	{1, 1, 3, 0,		/* 0xd3 */
1547 		{{0, 1},
1548 		{4, 4},
1549 		{6, 7},
1550 		{0, 0}
1551 		}
1552 	},
1553 	{0, 1, 3, 0,		/* 0xd4 */
1554 		{{2, 2},
1555 		{4, 4},
1556 		{6, 7},
1557 		{0, 0}
1558 		}
1559 	},
1560 	{1, 1, 4, 0,		/* 0xd5 */
1561 		{{0, 0},
1562 		{2, 2},
1563 		{4, 4},
1564 		{6, 7}
1565 		}
1566 	},
1567 	{0, 1, 3, 0,		/* 0xd6 */
1568 		{{1, 2},
1569 		{4, 4},
1570 		{6, 7},
1571 		{0, 0}
1572 		}
1573 	},
1574 	{1, 1, 3, 0,		/* 0xd7 */
1575 		{{0, 2},
1576 		{4, 4},
1577 		{6, 7},
1578 		{0, 0}
1579 		}
1580 	},
1581 	{0, 1, 2, 0,		/* 0xd8 */
1582 		{{3, 4},
1583 		{6, 7},
1584 		{0, 0},
1585 		{0, 0}
1586 		}
1587 	},
1588 	{1, 1, 3, 0,		/* 0xd9 */
1589 		{{0, 0},
1590 		{3, 4},
1591 		{6, 7},
1592 		{0, 0}
1593 		}
1594 	},
1595 	{0, 1, 3, 0,		/* 0xda */
1596 		{{1, 1},
1597 		{3, 4},
1598 		{6, 7},
1599 		{0, 0}
1600 		}
1601 	},
1602 	{1, 1, 3, 0,		/* 0xdb */
1603 		{{0, 1},
1604 		{3, 4},
1605 		{6, 7},
1606 		{0, 0}
1607 		}
1608 	},
1609 	{0, 1, 2, 0,		/* 0xdc */
1610 		{{2, 4},
1611 		{6, 7},
1612 		{0, 0},
1613 		{0, 0}
1614 		}
1615 	},
1616 	{1, 1, 3, 0,		/* 0xdd */
1617 		{{0, 0},
1618 		{2, 4},
1619 		{6, 7},
1620 		{0, 0}
1621 		}
1622 	},
1623 	{0, 1, 2, 0,		/* 0xde */
1624 		{{1, 4},
1625 		{6, 7},
1626 		{0, 0},
1627 		{0, 0}
1628 		}
1629 	},
1630 	{1, 1, 2, 0,		/* 0xdf */
1631 		{{0, 4},
1632 		{6, 7},
1633 		{0, 0},
1634 		{0, 0}
1635 		}
1636 	},
1637 	{0, 1, 1, 0,		/* 0xe0 */
1638 		{{5, 7},
1639 		{0, 0},
1640 		{0, 0},
1641 		{0, 0}
1642 		}
1643 	},
1644 	{1, 1, 2, 0,		/* 0xe1 */
1645 		{{0, 0},
1646 		{5, 7},
1647 		{0, 0},
1648 		{0, 0}
1649 		}
1650 	},
1651 	{0, 1, 2, 0,		/* 0xe2 */
1652 		{{1, 1},
1653 		{5, 7},
1654 		{0, 0},
1655 		{0, 0}
1656 		}
1657 	},
1658 	{1, 1, 2, 0,		/* 0xe3 */
1659 		{{0, 1},
1660 		{5, 7},
1661 		{0, 0},
1662 		{0, 0}
1663 		}
1664 	},
1665 	{0, 1, 2, 0,		/* 0xe4 */
1666 		{{2, 2},
1667 		{5, 7},
1668 		{0, 0},
1669 		{0, 0}
1670 		}
1671 	},
1672 	{1, 1, 3, 0,		/* 0xe5 */
1673 		{{0, 0},
1674 		{2, 2},
1675 		{5, 7},
1676 		{0, 0}
1677 		}
1678 	},
1679 	{0, 1, 2, 0,		/* 0xe6 */
1680 		{{1, 2},
1681 		{5, 7},
1682 		{0, 0},
1683 		{0, 0}
1684 		}
1685 	},
1686 	{1, 1, 2, 0,		/* 0xe7 */
1687 		{{0, 2},
1688 		{5, 7},
1689 		{0, 0},
1690 		{0, 0}
1691 		}
1692 	},
1693 	{0, 1, 2, 0,		/* 0xe8 */
1694 		{{3, 3},
1695 		{5, 7},
1696 		{0, 0},
1697 		{0, 0}
1698 		}
1699 	},
1700 	{1, 1, 3, 0,		/* 0xe9 */
1701 		{{0, 0},
1702 		{3, 3},
1703 		{5, 7},
1704 		{0, 0}
1705 		}
1706 	},
1707 	{0, 1, 3, 0,		/* 0xea */
1708 		{{1, 1},
1709 		{3, 3},
1710 		{5, 7},
1711 		{0, 0}
1712 		}
1713 	},
1714 	{1, 1, 3, 0,		/* 0xeb */
1715 		{{0, 1},
1716 		{3, 3},
1717 		{5, 7},
1718 		{0, 0}
1719 		}
1720 	},
1721 	{0, 1, 2, 0,		/* 0xec */
1722 		{{2, 3},
1723 		{5, 7},
1724 		{0, 0},
1725 		{0, 0}
1726 		}
1727 	},
1728 	{1, 1, 3, 0,		/* 0xed */
1729 		{{0, 0},
1730 		{2, 3},
1731 		{5, 7},
1732 		{0, 0}
1733 		}
1734 	},
1735 	{0, 1, 2, 0,		/* 0xee */
1736 		{{1, 3},
1737 		{5, 7},
1738 		{0, 0},
1739 		{0, 0}
1740 		}
1741 	},
1742 	{1, 1, 2, 0,		/* 0xef */
1743 		{{0, 3},
1744 		{5, 7},
1745 		{0, 0},
1746 		{0, 0}
1747 		}
1748 	},
1749 	{0, 1, 1, 0,		/* 0xf0 */
1750 		{{4, 7},
1751 		{0, 0},
1752 		{0, 0},
1753 		{0, 0}
1754 		}
1755 	},
1756 	{1, 1, 2, 0,		/* 0xf1 */
1757 		{{0, 0},
1758 		{4, 7},
1759 		{0, 0},
1760 		{0, 0}
1761 		}
1762 	},
1763 	{0, 1, 2, 0,		/* 0xf2 */
1764 		{{1, 1},
1765 		{4, 7},
1766 		{0, 0},
1767 		{0, 0}
1768 		}
1769 	},
1770 	{1, 1, 2, 0,		/* 0xf3 */
1771 		{{0, 1},
1772 		{4, 7},
1773 		{0, 0},
1774 		{0, 0}
1775 		}
1776 	},
1777 	{0, 1, 2, 0,		/* 0xf4 */
1778 		{{2, 2},
1779 		{4, 7},
1780 		{0, 0},
1781 		{0, 0}
1782 		}
1783 	},
1784 	{1, 1, 3, 0,		/* 0xf5 */
1785 		{{0, 0},
1786 		{2, 2},
1787 		{4, 7},
1788 		{0, 0}
1789 		}
1790 	},
1791 	{0, 1, 2, 0,		/* 0xf6 */
1792 		{{1, 2},
1793 		{4, 7},
1794 		{0, 0},
1795 		{0, 0}
1796 		}
1797 	},
1798 	{1, 1, 2, 0,		/* 0xf7 */
1799 		{{0, 2},
1800 		{4, 7},
1801 		{0, 0},
1802 		{0, 0}
1803 		}
1804 	},
1805 	{0, 1, 1, 0,		/* 0xf8 */
1806 		{{3, 7},
1807 		{0, 0},
1808 		{0, 0},
1809 		{0, 0}
1810 		}
1811 	},
1812 	{1, 1, 2, 0,		/* 0xf9 */
1813 		{{0, 0},
1814 		{3, 7},
1815 		{0, 0},
1816 		{0, 0}
1817 		}
1818 	},
1819 	{0, 1, 2, 0,		/* 0xfa */
1820 		{{1, 1},
1821 		{3, 7},
1822 		{0, 0},
1823 		{0, 0}
1824 		}
1825 	},
1826 	{1, 1, 2, 0,		/* 0xfb */
1827 		{{0, 1},
1828 		{3, 7},
1829 		{0, 0},
1830 		{0, 0}
1831 		}
1832 	},
1833 	{0, 1, 1, 0,		/* 0xfc */
1834 		{{2, 7},
1835 		{0, 0},
1836 		{0, 0},
1837 		{0, 0}
1838 		}
1839 	},
1840 	{1, 1, 2, 0,		/* 0xfd */
1841 		{{0, 0},
1842 		{2, 7},
1843 		{0, 0},
1844 		{0, 0}
1845 		}
1846 	},
1847 	{0, 1, 1, 0,		/* 0xfe */
1848 		{{1, 7},
1849 		{0, 0},
1850 		{0, 0},
1851 		{0, 0}
1852 		}
1853 	},
1854 	{1, 1, 1, 0,		/* 0xff */
1855 		{{0, 7},
1856 		{0, 0},
1857 		{0, 0},
1858 		{0, 0}
1859 		}
1860 	}
1861 };
1862 
1863 
1864 int
1865 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1866     int ipv4_addr_legal,
1867     int ipv6_addr_legal,
1868     int loopback_scope,
1869     int ipv4_local_scope,
1870     int local_scope SCTP_UNUSED,/* XXX */
1871     int site_scope,
1872     int do_update)
1873 {
1874 	if ((loopback_scope == 0) &&
1875 	    (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1876 		/*
1877 		 * skip loopback if not in scope *
1878 		 */
1879 		return (0);
1880 	}
1881 	switch (ifa->address.sa.sa_family) {
1882 #ifdef INET
1883 	case AF_INET:
1884 		if (ipv4_addr_legal) {
1885 			struct sockaddr_in *sin;
1886 
1887 			sin = (struct sockaddr_in *)&ifa->address.sin;
1888 			if (sin->sin_addr.s_addr == 0) {
1889 				/* not in scope , unspecified */
1890 				return (0);
1891 			}
1892 			if ((ipv4_local_scope == 0) &&
1893 			    (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1894 				/* private address not in scope */
1895 				return (0);
1896 			}
1897 		} else {
1898 			return (0);
1899 		}
1900 		break;
1901 #endif
1902 #ifdef INET6
1903 	case AF_INET6:
1904 		if (ipv6_addr_legal) {
1905 			struct sockaddr_in6 *sin6;
1906 
1907 			/*
1908 			 * Must update the flags,  bummer, which means any
1909 			 * IFA locks must now be applied HERE <->
1910 			 */
1911 			if (do_update) {
1912 				sctp_gather_internal_ifa_flags(ifa);
1913 			}
1914 			if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1915 				return (0);
1916 			}
1917 			/* ok to use deprecated addresses? */
1918 			sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1919 			if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1920 				/* skip unspecifed addresses */
1921 				return (0);
1922 			}
1923 			if (	/* (local_scope == 0) && */
1924 			    (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1925 				return (0);
1926 			}
1927 			if ((site_scope == 0) &&
1928 			    (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1929 				return (0);
1930 			}
1931 		} else {
1932 			return (0);
1933 		}
1934 		break;
1935 #endif
1936 	default:
1937 		return (0);
1938 	}
1939 	return (1);
1940 }
1941 
1942 static struct mbuf *
1943 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
1944 {
1945 	struct sctp_paramhdr *parmh;
1946 	struct mbuf *mret;
1947 	int len;
1948 
1949 	switch (ifa->address.sa.sa_family) {
1950 #ifdef INET
1951 	case AF_INET:
1952 		len = sizeof(struct sctp_ipv4addr_param);
1953 		break;
1954 #endif
1955 #ifdef INET6
1956 	case AF_INET6:
1957 		len = sizeof(struct sctp_ipv6addr_param);
1958 		break;
1959 #endif
1960 	default:
1961 		return (m);
1962 	}
1963 	if (M_TRAILINGSPACE(m) >= len) {
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(len, 0, M_DONTWAIT, 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 = (struct sockaddr_in *)&ifa->address.sin;
1990 			ipv4p = (struct sctp_ipv4addr_param *)parmh;
1991 			parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1992 			parmh->param_length = htons(len);
1993 			ipv4p->addr = sin->sin_addr.s_addr;
1994 			SCTP_BUF_LEN(mret) += len;
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 = (struct sockaddr_in6 *)&ifa->address.sin6;
2005 			ipv6p = (struct sctp_ipv6addr_param *)parmh;
2006 			parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2007 			parmh->param_length = htons(len);
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) += len;
2013 			break;
2014 		}
2015 #endif
2016 	default:
2017 		return (m);
2018 	}
2019 	return (mret);
2020 }
2021 
2022 
2023 struct mbuf *
2024 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2025     struct sctp_scoping *scope,
2026     struct mbuf *m_at, int cnt_inits_to)
2027 {
2028 	struct sctp_vrf *vrf = NULL;
2029 	int cnt, limit_out = 0, total_count;
2030 	uint32_t vrf_id;
2031 
2032 	vrf_id = inp->def_vrf_id;
2033 	SCTP_IPI_ADDR_RLOCK();
2034 	vrf = sctp_find_vrf(vrf_id);
2035 	if (vrf == NULL) {
2036 		SCTP_IPI_ADDR_RUNLOCK();
2037 		return (m_at);
2038 	}
2039 	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2040 		struct sctp_ifa *sctp_ifap;
2041 		struct sctp_ifn *sctp_ifnp;
2042 
2043 		cnt = cnt_inits_to;
2044 		if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2045 			limit_out = 1;
2046 			cnt = SCTP_ADDRESS_LIMIT;
2047 			goto skip_count;
2048 		}
2049 		LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2050 			if ((scope->loopback_scope == 0) &&
2051 			    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2052 				/*
2053 				 * Skip loopback devices if loopback_scope
2054 				 * not set
2055 				 */
2056 				continue;
2057 			}
2058 			LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2059 				if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2060 					continue;
2061 				}
2062 				if (sctp_is_address_in_scope(sctp_ifap,
2063 				    scope->ipv4_addr_legal,
2064 				    scope->ipv6_addr_legal,
2065 				    scope->loopback_scope,
2066 				    scope->ipv4_local_scope,
2067 				    scope->local_scope,
2068 				    scope->site_scope, 1) == 0) {
2069 					continue;
2070 				}
2071 				cnt++;
2072 				if (cnt > SCTP_ADDRESS_LIMIT) {
2073 					break;
2074 				}
2075 			}
2076 			if (cnt > SCTP_ADDRESS_LIMIT) {
2077 				break;
2078 			}
2079 		}
2080 skip_count:
2081 		if (cnt > 1) {
2082 			total_count = 0;
2083 			LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2084 				cnt = 0;
2085 				if ((scope->loopback_scope == 0) &&
2086 				    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2087 					/*
2088 					 * Skip loopback devices if
2089 					 * loopback_scope not set
2090 					 */
2091 					continue;
2092 				}
2093 				LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2094 					if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2095 						continue;
2096 					}
2097 					if (sctp_is_address_in_scope(sctp_ifap,
2098 					    scope->ipv4_addr_legal,
2099 					    scope->ipv6_addr_legal,
2100 					    scope->loopback_scope,
2101 					    scope->ipv4_local_scope,
2102 					    scope->local_scope,
2103 					    scope->site_scope, 0) == 0) {
2104 						continue;
2105 					}
2106 					m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
2107 					if (limit_out) {
2108 						cnt++;
2109 						total_count++;
2110 						if (cnt >= 2) {
2111 							/*
2112 							 * two from each
2113 							 * address
2114 							 */
2115 							break;
2116 						}
2117 						if (total_count > SCTP_ADDRESS_LIMIT) {
2118 							/* No more addresses */
2119 							break;
2120 						}
2121 					}
2122 				}
2123 			}
2124 		}
2125 	} else {
2126 		struct sctp_laddr *laddr;
2127 
2128 		cnt = cnt_inits_to;
2129 		/* First, how many ? */
2130 		LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2131 			if (laddr->ifa == NULL) {
2132 				continue;
2133 			}
2134 			if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2135 				/*
2136 				 * Address being deleted by the system, dont
2137 				 * list.
2138 				 */
2139 				continue;
2140 			if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2141 				/*
2142 				 * Address being deleted on this ep don't
2143 				 * list.
2144 				 */
2145 				continue;
2146 			}
2147 			if (sctp_is_address_in_scope(laddr->ifa,
2148 			    scope->ipv4_addr_legal,
2149 			    scope->ipv6_addr_legal,
2150 			    scope->loopback_scope,
2151 			    scope->ipv4_local_scope,
2152 			    scope->local_scope,
2153 			    scope->site_scope, 1) == 0) {
2154 				continue;
2155 			}
2156 			cnt++;
2157 		}
2158 		/*
2159 		 * To get through a NAT we only list addresses if we have
2160 		 * more than one. That way if you just bind a single address
2161 		 * we let the source of the init dictate our address.
2162 		 */
2163 		if (cnt > 1) {
2164 			cnt = cnt_inits_to;
2165 			LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2166 				if (laddr->ifa == NULL) {
2167 					continue;
2168 				}
2169 				if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2170 					continue;
2171 				}
2172 				if (sctp_is_address_in_scope(laddr->ifa,
2173 				    scope->ipv4_addr_legal,
2174 				    scope->ipv6_addr_legal,
2175 				    scope->loopback_scope,
2176 				    scope->ipv4_local_scope,
2177 				    scope->local_scope,
2178 				    scope->site_scope, 0) == 0) {
2179 					continue;
2180 				}
2181 				m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
2182 				cnt++;
2183 				if (cnt >= SCTP_ADDRESS_LIMIT) {
2184 					break;
2185 				}
2186 			}
2187 		}
2188 	}
2189 	SCTP_IPI_ADDR_RUNLOCK();
2190 	return (m_at);
2191 }
2192 
2193 static struct sctp_ifa *
2194 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2195     uint8_t dest_is_loop,
2196     uint8_t dest_is_priv,
2197     sa_family_t fam)
2198 {
2199 	uint8_t dest_is_global = 0;
2200 
2201 	/* dest_is_priv is true if destination is a private address */
2202 	/* dest_is_loop is true if destination is a loopback addresses */
2203 
2204 	/**
2205 	 * Here we determine if its a preferred address. A preferred address
2206 	 * means it is the same scope or higher scope then the destination.
2207 	 * L = loopback, P = private, G = global
2208 	 * -----------------------------------------
2209 	 *    src    |  dest | result
2210 	 *  ----------------------------------------
2211 	 *     L     |    L  |    yes
2212 	 *  -----------------------------------------
2213 	 *     P     |    L  |    yes-v4 no-v6
2214 	 *  -----------------------------------------
2215 	 *     G     |    L  |    yes-v4 no-v6
2216 	 *  -----------------------------------------
2217 	 *     L     |    P  |    no
2218 	 *  -----------------------------------------
2219 	 *     P     |    P  |    yes
2220 	 *  -----------------------------------------
2221 	 *     G     |    P  |    no
2222 	 *   -----------------------------------------
2223 	 *     L     |    G  |    no
2224 	 *   -----------------------------------------
2225 	 *     P     |    G  |    no
2226 	 *    -----------------------------------------
2227 	 *     G     |    G  |    yes
2228 	 *    -----------------------------------------
2229 	 */
2230 
2231 	if (ifa->address.sa.sa_family != fam) {
2232 		/* forget mis-matched family */
2233 		return (NULL);
2234 	}
2235 	if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2236 		dest_is_global = 1;
2237 	}
2238 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2239 	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2240 	/* Ok the address may be ok */
2241 #ifdef INET6
2242 	if (fam == AF_INET6) {
2243 		/* ok to use deprecated addresses? no lets not! */
2244 		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2245 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2246 			return (NULL);
2247 		}
2248 		if (ifa->src_is_priv && !ifa->src_is_loop) {
2249 			if (dest_is_loop) {
2250 				SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2251 				return (NULL);
2252 			}
2253 		}
2254 		if (ifa->src_is_glob) {
2255 			if (dest_is_loop) {
2256 				SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2257 				return (NULL);
2258 			}
2259 		}
2260 	}
2261 #endif
2262 	/*
2263 	 * Now that we know what is what, implement or table this could in
2264 	 * theory be done slicker (it used to be), but this is
2265 	 * straightforward and easier to validate :-)
2266 	 */
2267 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2268 	    ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2269 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2270 	    dest_is_loop, dest_is_priv, dest_is_global);
2271 
2272 	if ((ifa->src_is_loop) && (dest_is_priv)) {
2273 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2274 		return (NULL);
2275 	}
2276 	if ((ifa->src_is_glob) && (dest_is_priv)) {
2277 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2278 		return (NULL);
2279 	}
2280 	if ((ifa->src_is_loop) && (dest_is_global)) {
2281 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2282 		return (NULL);
2283 	}
2284 	if ((ifa->src_is_priv) && (dest_is_global)) {
2285 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2286 		return (NULL);
2287 	}
2288 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2289 	/* its a preferred address */
2290 	return (ifa);
2291 }
2292 
2293 static struct sctp_ifa *
2294 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2295     uint8_t dest_is_loop,
2296     uint8_t dest_is_priv,
2297     sa_family_t fam)
2298 {
2299 	uint8_t dest_is_global = 0;
2300 
2301 	/**
2302 	 * Here we determine if its a acceptable address. A acceptable
2303 	 * address means it is the same scope or higher scope but we can
2304 	 * allow for NAT which means its ok to have a global dest and a
2305 	 * private src.
2306 	 *
2307 	 * L = loopback, P = private, G = global
2308 	 * -----------------------------------------
2309 	 *  src    |  dest | result
2310 	 * -----------------------------------------
2311 	 *   L     |   L   |    yes
2312 	 *  -----------------------------------------
2313 	 *   P     |   L   |    yes-v4 no-v6
2314 	 *  -----------------------------------------
2315 	 *   G     |   L   |    yes
2316 	 * -----------------------------------------
2317 	 *   L     |   P   |    no
2318 	 * -----------------------------------------
2319 	 *   P     |   P   |    yes
2320 	 * -----------------------------------------
2321 	 *   G     |   P   |    yes - May not work
2322 	 * -----------------------------------------
2323 	 *   L     |   G   |    no
2324 	 * -----------------------------------------
2325 	 *   P     |   G   |    yes - May not work
2326 	 * -----------------------------------------
2327 	 *   G     |   G   |    yes
2328 	 * -----------------------------------------
2329 	 */
2330 
2331 	if (ifa->address.sa.sa_family != fam) {
2332 		/* forget non matching family */
2333 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2334 		    ifa->address.sa.sa_family, fam);
2335 		return (NULL);
2336 	}
2337 	/* Ok the address may be ok */
2338 	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2339 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2340 	    dest_is_loop, dest_is_priv);
2341 	if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2342 		dest_is_global = 1;
2343 	}
2344 #ifdef INET6
2345 	if (fam == AF_INET6) {
2346 		/* ok to use deprecated addresses? */
2347 		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2348 			return (NULL);
2349 		}
2350 		if (ifa->src_is_priv) {
2351 			/* Special case, linklocal to loop */
2352 			if (dest_is_loop)
2353 				return (NULL);
2354 		}
2355 	}
2356 #endif
2357 	/*
2358 	 * Now that we know what is what, implement our table. This could in
2359 	 * theory be done slicker (it used to be), but this is
2360 	 * straightforward and easier to validate :-)
2361 	 */
2362 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2363 	    ifa->src_is_loop,
2364 	    dest_is_priv);
2365 	if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2366 		return (NULL);
2367 	}
2368 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2369 	    ifa->src_is_loop,
2370 	    dest_is_global);
2371 	if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2372 		return (NULL);
2373 	}
2374 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2375 	/* its an acceptable address */
2376 	return (ifa);
2377 }
2378 
2379 int
2380 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2381 {
2382 	struct sctp_laddr *laddr;
2383 
2384 	if (stcb == NULL) {
2385 		/* There are no restrictions, no TCB :-) */
2386 		return (0);
2387 	}
2388 	LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2389 		if (laddr->ifa == NULL) {
2390 			SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2391 			    __FUNCTION__);
2392 			continue;
2393 		}
2394 		if (laddr->ifa == ifa) {
2395 			/* Yes it is on the list */
2396 			return (1);
2397 		}
2398 	}
2399 	return (0);
2400 }
2401 
2402 
2403 int
2404 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2405 {
2406 	struct sctp_laddr *laddr;
2407 
2408 	if (ifa == NULL)
2409 		return (0);
2410 	LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2411 		if (laddr->ifa == NULL) {
2412 			SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2413 			    __FUNCTION__);
2414 			continue;
2415 		}
2416 		if ((laddr->ifa == ifa) && laddr->action == 0)
2417 			/* same pointer */
2418 			return (1);
2419 	}
2420 	return (0);
2421 }
2422 
2423 
2424 
2425 static struct sctp_ifa *
2426 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2427     sctp_route_t * ro,
2428     uint32_t vrf_id,
2429     int non_asoc_addr_ok,
2430     uint8_t dest_is_priv,
2431     uint8_t dest_is_loop,
2432     sa_family_t fam)
2433 {
2434 	struct sctp_laddr *laddr, *starting_point;
2435 	void *ifn;
2436 	int resettotop = 0;
2437 	struct sctp_ifn *sctp_ifn;
2438 	struct sctp_ifa *sctp_ifa, *sifa;
2439 	struct sctp_vrf *vrf;
2440 	uint32_t ifn_index;
2441 
2442 	vrf = sctp_find_vrf(vrf_id);
2443 	if (vrf == NULL)
2444 		return (NULL);
2445 
2446 	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2447 	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2448 	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2449 	/*
2450 	 * first question, is the ifn we will emit on in our list, if so, we
2451 	 * want such an address. Note that we first looked for a preferred
2452 	 * address.
2453 	 */
2454 	if (sctp_ifn) {
2455 		/* is a preferred one on the interface we route out? */
2456 		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2457 			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2458 			    (non_asoc_addr_ok == 0))
2459 				continue;
2460 			sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2461 			    dest_is_loop,
2462 			    dest_is_priv, fam);
2463 			if (sifa == NULL)
2464 				continue;
2465 			if (sctp_is_addr_in_ep(inp, sifa)) {
2466 				atomic_add_int(&sifa->refcount, 1);
2467 				return (sifa);
2468 			}
2469 		}
2470 	}
2471 	/*
2472 	 * ok, now we now need to find one on the list of the addresses. We
2473 	 * can't get one on the emitting interface so let's find first a
2474 	 * preferred one. If not that an acceptable one otherwise... we
2475 	 * return NULL.
2476 	 */
2477 	starting_point = inp->next_addr_touse;
2478 once_again:
2479 	if (inp->next_addr_touse == NULL) {
2480 		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2481 		resettotop = 1;
2482 	}
2483 	for (laddr = inp->next_addr_touse; laddr;
2484 	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2485 		if (laddr->ifa == NULL) {
2486 			/* address has been removed */
2487 			continue;
2488 		}
2489 		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2490 			/* address is being deleted */
2491 			continue;
2492 		}
2493 		sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2494 		    dest_is_priv, fam);
2495 		if (sifa == NULL)
2496 			continue;
2497 		atomic_add_int(&sifa->refcount, 1);
2498 		return (sifa);
2499 	}
2500 	if (resettotop == 0) {
2501 		inp->next_addr_touse = NULL;
2502 		goto once_again;
2503 	}
2504 	inp->next_addr_touse = starting_point;
2505 	resettotop = 0;
2506 once_again_too:
2507 	if (inp->next_addr_touse == NULL) {
2508 		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2509 		resettotop = 1;
2510 	}
2511 	/* ok, what about an acceptable address in the inp */
2512 	for (laddr = inp->next_addr_touse; laddr;
2513 	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2514 		if (laddr->ifa == NULL) {
2515 			/* address has been removed */
2516 			continue;
2517 		}
2518 		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2519 			/* address is being deleted */
2520 			continue;
2521 		}
2522 		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2523 		    dest_is_priv, fam);
2524 		if (sifa == NULL)
2525 			continue;
2526 		atomic_add_int(&sifa->refcount, 1);
2527 		return (sifa);
2528 	}
2529 	if (resettotop == 0) {
2530 		inp->next_addr_touse = NULL;
2531 		goto once_again_too;
2532 	}
2533 	/*
2534 	 * no address bound can be a source for the destination we are in
2535 	 * trouble
2536 	 */
2537 	return (NULL);
2538 }
2539 
2540 
2541 
2542 static struct sctp_ifa *
2543 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2544     struct sctp_tcb *stcb,
2545     sctp_route_t * ro,
2546     uint32_t vrf_id,
2547     uint8_t dest_is_priv,
2548     uint8_t dest_is_loop,
2549     int non_asoc_addr_ok,
2550     sa_family_t fam)
2551 {
2552 	struct sctp_laddr *laddr, *starting_point;
2553 	void *ifn;
2554 	struct sctp_ifn *sctp_ifn;
2555 	struct sctp_ifa *sctp_ifa, *sifa;
2556 	uint8_t start_at_beginning = 0;
2557 	struct sctp_vrf *vrf;
2558 	uint32_t ifn_index;
2559 
2560 	/*
2561 	 * first question, is the ifn we will emit on in our list, if so, we
2562 	 * want that one.
2563 	 */
2564 	vrf = sctp_find_vrf(vrf_id);
2565 	if (vrf == NULL)
2566 		return (NULL);
2567 
2568 	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2569 	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2570 	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2571 
2572 	/*
2573 	 * first question, is the ifn we will emit on in our list?  If so,
2574 	 * we want that one. First we look for a preferred. Second, we go
2575 	 * for an acceptable.
2576 	 */
2577 	if (sctp_ifn) {
2578 		/* first try for a preferred address on the ep */
2579 		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2580 			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2581 				continue;
2582 			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2583 				sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2584 				if (sifa == NULL)
2585 					continue;
2586 				if (((non_asoc_addr_ok == 0) &&
2587 				    (sctp_is_addr_restricted(stcb, sifa))) ||
2588 				    (non_asoc_addr_ok &&
2589 				    (sctp_is_addr_restricted(stcb, sifa)) &&
2590 				    (!sctp_is_addr_pending(stcb, sifa)))) {
2591 					/* on the no-no list */
2592 					continue;
2593 				}
2594 				atomic_add_int(&sifa->refcount, 1);
2595 				return (sifa);
2596 			}
2597 		}
2598 		/* next try for an acceptable address on the ep */
2599 		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2600 			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2601 				continue;
2602 			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2603 				sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2604 				if (sifa == NULL)
2605 					continue;
2606 				if (((non_asoc_addr_ok == 0) &&
2607 				    (sctp_is_addr_restricted(stcb, sifa))) ||
2608 				    (non_asoc_addr_ok &&
2609 				    (sctp_is_addr_restricted(stcb, sifa)) &&
2610 				    (!sctp_is_addr_pending(stcb, sifa)))) {
2611 					/* on the no-no list */
2612 					continue;
2613 				}
2614 				atomic_add_int(&sifa->refcount, 1);
2615 				return (sifa);
2616 			}
2617 		}
2618 
2619 	}
2620 	/*
2621 	 * if we can't find one like that then we must look at all addresses
2622 	 * bound to pick one at first preferable then secondly acceptable.
2623 	 */
2624 	starting_point = stcb->asoc.last_used_address;
2625 sctp_from_the_top:
2626 	if (stcb->asoc.last_used_address == NULL) {
2627 		start_at_beginning = 1;
2628 		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2629 	}
2630 	/* search beginning with the last used address */
2631 	for (laddr = stcb->asoc.last_used_address; laddr;
2632 	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2633 		if (laddr->ifa == NULL) {
2634 			/* address has been removed */
2635 			continue;
2636 		}
2637 		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2638 			/* address is being deleted */
2639 			continue;
2640 		}
2641 		sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2642 		if (sifa == NULL)
2643 			continue;
2644 		if (((non_asoc_addr_ok == 0) &&
2645 		    (sctp_is_addr_restricted(stcb, sifa))) ||
2646 		    (non_asoc_addr_ok &&
2647 		    (sctp_is_addr_restricted(stcb, sifa)) &&
2648 		    (!sctp_is_addr_pending(stcb, sifa)))) {
2649 			/* on the no-no list */
2650 			continue;
2651 		}
2652 		stcb->asoc.last_used_address = laddr;
2653 		atomic_add_int(&sifa->refcount, 1);
2654 		return (sifa);
2655 	}
2656 	if (start_at_beginning == 0) {
2657 		stcb->asoc.last_used_address = NULL;
2658 		goto sctp_from_the_top;
2659 	}
2660 	/* now try for any higher scope than the destination */
2661 	stcb->asoc.last_used_address = starting_point;
2662 	start_at_beginning = 0;
2663 sctp_from_the_top2:
2664 	if (stcb->asoc.last_used_address == NULL) {
2665 		start_at_beginning = 1;
2666 		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2667 	}
2668 	/* search beginning with the last used address */
2669 	for (laddr = stcb->asoc.last_used_address; laddr;
2670 	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2671 		if (laddr->ifa == NULL) {
2672 			/* address has been removed */
2673 			continue;
2674 		}
2675 		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2676 			/* address is being deleted */
2677 			continue;
2678 		}
2679 		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2680 		    dest_is_priv, fam);
2681 		if (sifa == NULL)
2682 			continue;
2683 		if (((non_asoc_addr_ok == 0) &&
2684 		    (sctp_is_addr_restricted(stcb, sifa))) ||
2685 		    (non_asoc_addr_ok &&
2686 		    (sctp_is_addr_restricted(stcb, sifa)) &&
2687 		    (!sctp_is_addr_pending(stcb, sifa)))) {
2688 			/* on the no-no list */
2689 			continue;
2690 		}
2691 		stcb->asoc.last_used_address = laddr;
2692 		atomic_add_int(&sifa->refcount, 1);
2693 		return (sifa);
2694 	}
2695 	if (start_at_beginning == 0) {
2696 		stcb->asoc.last_used_address = NULL;
2697 		goto sctp_from_the_top2;
2698 	}
2699 	return (NULL);
2700 }
2701 
2702 static struct sctp_ifa *
2703 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2704     struct sctp_tcb *stcb,
2705     int non_asoc_addr_ok,
2706     uint8_t dest_is_loop,
2707     uint8_t dest_is_priv,
2708     int addr_wanted,
2709     sa_family_t fam,
2710     sctp_route_t * ro
2711 )
2712 {
2713 	struct sctp_ifa *ifa, *sifa;
2714 	int num_eligible_addr = 0;
2715 
2716 #ifdef INET6
2717 	struct sockaddr_in6 sin6, lsa6;
2718 
2719 	if (fam == AF_INET6) {
2720 		memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2721 		(void)sa6_recoverscope(&sin6);
2722 	}
2723 #endif				/* INET6 */
2724 	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2725 		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2726 		    (non_asoc_addr_ok == 0))
2727 			continue;
2728 		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2729 		    dest_is_priv, fam);
2730 		if (sifa == NULL)
2731 			continue;
2732 #ifdef INET6
2733 		if (fam == AF_INET6 &&
2734 		    dest_is_loop &&
2735 		    sifa->src_is_loop && sifa->src_is_priv) {
2736 			/*
2737 			 * don't allow fe80::1 to be a src on loop ::1, we
2738 			 * don't list it to the peer so we will get an
2739 			 * abort.
2740 			 */
2741 			continue;
2742 		}
2743 		if (fam == AF_INET6 &&
2744 		    IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2745 		    IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2746 			/*
2747 			 * link-local <-> link-local must belong to the same
2748 			 * scope.
2749 			 */
2750 			memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2751 			(void)sa6_recoverscope(&lsa6);
2752 			if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2753 				continue;
2754 			}
2755 		}
2756 #endif				/* INET6 */
2757 
2758 		/*
2759 		 * Check if the IPv6 address matches to next-hop. In the
2760 		 * mobile case, old IPv6 address may be not deleted from the
2761 		 * interface. Then, the interface has previous and new
2762 		 * addresses.  We should use one corresponding to the
2763 		 * next-hop.  (by micchie)
2764 		 */
2765 #ifdef INET6
2766 		if (stcb && fam == AF_INET6 &&
2767 		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2768 			if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2769 			    == 0) {
2770 				continue;
2771 			}
2772 		}
2773 #endif
2774 #ifdef INET
2775 		/* Avoid topologically incorrect IPv4 address */
2776 		if (stcb && fam == AF_INET &&
2777 		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2778 			if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2779 				continue;
2780 			}
2781 		}
2782 #endif
2783 		if (stcb) {
2784 			if (sctp_is_address_in_scope(ifa,
2785 			    stcb->asoc.ipv4_addr_legal,
2786 			    stcb->asoc.ipv6_addr_legal,
2787 			    stcb->asoc.loopback_scope,
2788 			    stcb->asoc.ipv4_local_scope,
2789 			    stcb->asoc.local_scope,
2790 			    stcb->asoc.site_scope, 0) == 0) {
2791 				continue;
2792 			}
2793 			if (((non_asoc_addr_ok == 0) &&
2794 			    (sctp_is_addr_restricted(stcb, sifa))) ||
2795 			    (non_asoc_addr_ok &&
2796 			    (sctp_is_addr_restricted(stcb, sifa)) &&
2797 			    (!sctp_is_addr_pending(stcb, sifa)))) {
2798 				/*
2799 				 * It is restricted for some reason..
2800 				 * probably not yet added.
2801 				 */
2802 				continue;
2803 			}
2804 		}
2805 		if (num_eligible_addr >= addr_wanted) {
2806 			return (sifa);
2807 		}
2808 		num_eligible_addr++;
2809 	}
2810 	return (NULL);
2811 }
2812 
2813 
2814 static int
2815 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2816     struct sctp_tcb *stcb,
2817     int non_asoc_addr_ok,
2818     uint8_t dest_is_loop,
2819     uint8_t dest_is_priv,
2820     sa_family_t fam)
2821 {
2822 	struct sctp_ifa *ifa, *sifa;
2823 	int num_eligible_addr = 0;
2824 
2825 	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2826 		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2827 		    (non_asoc_addr_ok == 0)) {
2828 			continue;
2829 		}
2830 		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2831 		    dest_is_priv, fam);
2832 		if (sifa == NULL) {
2833 			continue;
2834 		}
2835 		if (stcb) {
2836 			if (sctp_is_address_in_scope(ifa,
2837 			    stcb->asoc.ipv4_addr_legal,
2838 			    stcb->asoc.ipv6_addr_legal,
2839 			    stcb->asoc.loopback_scope,
2840 			    stcb->asoc.ipv4_local_scope,
2841 			    stcb->asoc.local_scope,
2842 			    stcb->asoc.site_scope, 0) == 0) {
2843 				continue;
2844 			}
2845 			if (((non_asoc_addr_ok == 0) &&
2846 			    (sctp_is_addr_restricted(stcb, sifa))) ||
2847 			    (non_asoc_addr_ok &&
2848 			    (sctp_is_addr_restricted(stcb, sifa)) &&
2849 			    (!sctp_is_addr_pending(stcb, sifa)))) {
2850 				/*
2851 				 * It is restricted for some reason..
2852 				 * probably not yet added.
2853 				 */
2854 				continue;
2855 			}
2856 		}
2857 		num_eligible_addr++;
2858 	}
2859 	return (num_eligible_addr);
2860 }
2861 
2862 static struct sctp_ifa *
2863 sctp_choose_boundall(struct sctp_tcb *stcb,
2864     struct sctp_nets *net,
2865     sctp_route_t * ro,
2866     uint32_t vrf_id,
2867     uint8_t dest_is_priv,
2868     uint8_t dest_is_loop,
2869     int non_asoc_addr_ok,
2870     sa_family_t fam)
2871 {
2872 	int cur_addr_num = 0, num_preferred = 0;
2873 	void *ifn;
2874 	struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2875 	struct sctp_ifa *sctp_ifa, *sifa;
2876 	uint32_t ifn_index;
2877 	struct sctp_vrf *vrf;
2878 
2879 #ifdef INET
2880 	int retried = 0;
2881 
2882 #endif
2883 
2884 	/*-
2885 	 * For boundall we can use any address in the association.
2886 	 * If non_asoc_addr_ok is set we can use any address (at least in
2887 	 * theory). So we look for preferred addresses first. If we find one,
2888 	 * we use it. Otherwise we next try to get an address on the
2889 	 * interface, which we should be able to do (unless non_asoc_addr_ok
2890 	 * is false and we are routed out that way). In these cases where we
2891 	 * can't use the address of the interface we go through all the
2892 	 * ifn's looking for an address we can use and fill that in. Punting
2893 	 * means we send back address 0, which will probably cause problems
2894 	 * actually since then IP will fill in the address of the route ifn,
2895 	 * which means we probably already rejected it.. i.e. here comes an
2896 	 * abort :-<.
2897 	 */
2898 	vrf = sctp_find_vrf(vrf_id);
2899 	if (vrf == NULL)
2900 		return (NULL);
2901 
2902 	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2903 	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2904 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2905 	emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2906 	if (sctp_ifn == NULL) {
2907 		/* ?? We don't have this guy ?? */
2908 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2909 		goto bound_all_plan_b;
2910 	}
2911 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2912 	    ifn_index, sctp_ifn->ifn_name);
2913 
2914 	if (net) {
2915 		cur_addr_num = net->indx_of_eligible_next_to_use;
2916 	}
2917 	num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2918 	    stcb,
2919 	    non_asoc_addr_ok,
2920 	    dest_is_loop,
2921 	    dest_is_priv, fam);
2922 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2923 	    num_preferred, sctp_ifn->ifn_name);
2924 	if (num_preferred == 0) {
2925 		/*
2926 		 * no eligible addresses, we must use some other interface
2927 		 * address if we can find one.
2928 		 */
2929 		goto bound_all_plan_b;
2930 	}
2931 	/*
2932 	 * Ok we have num_eligible_addr set with how many we can use, this
2933 	 * may vary from call to call due to addresses being deprecated
2934 	 * etc..
2935 	 */
2936 	if (cur_addr_num >= num_preferred) {
2937 		cur_addr_num = 0;
2938 	}
2939 	/*
2940 	 * select the nth address from the list (where cur_addr_num is the
2941 	 * nth) and 0 is the first one, 1 is the second one etc...
2942 	 */
2943 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2944 
2945 	sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2946 	    dest_is_priv, cur_addr_num, fam, ro);
2947 
2948 	/* if sctp_ifa is NULL something changed??, fall to plan b. */
2949 	if (sctp_ifa) {
2950 		atomic_add_int(&sctp_ifa->refcount, 1);
2951 		if (net) {
2952 			/* save off where the next one we will want */
2953 			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2954 		}
2955 		return (sctp_ifa);
2956 	}
2957 	/*
2958 	 * plan_b: Look at all interfaces and find a preferred address. If
2959 	 * no preferred fall through to plan_c.
2960 	 */
2961 bound_all_plan_b:
2962 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2963 	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2964 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2965 		    sctp_ifn->ifn_name);
2966 		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2967 			/* wrong base scope */
2968 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2969 			continue;
2970 		}
2971 		if ((sctp_ifn == looked_at) && looked_at) {
2972 			/* already looked at this guy */
2973 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2974 			continue;
2975 		}
2976 		num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2977 		    dest_is_loop, dest_is_priv, fam);
2978 		SCTPDBG(SCTP_DEBUG_OUTPUT2,
2979 		    "Found ifn:%p %d preferred source addresses\n",
2980 		    ifn, num_preferred);
2981 		if (num_preferred == 0) {
2982 			/* None on this interface. */
2983 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2984 			continue;
2985 		}
2986 		SCTPDBG(SCTP_DEBUG_OUTPUT2,
2987 		    "num preferred:%d on interface:%p cur_addr_num:%d\n",
2988 		    num_preferred, sctp_ifn, cur_addr_num);
2989 
2990 		/*
2991 		 * Ok we have num_eligible_addr set with how many we can
2992 		 * use, this may vary from call to call due to addresses
2993 		 * being deprecated etc..
2994 		 */
2995 		if (cur_addr_num >= num_preferred) {
2996 			cur_addr_num = 0;
2997 		}
2998 		sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2999 		    dest_is_priv, cur_addr_num, fam, ro);
3000 		if (sifa == NULL)
3001 			continue;
3002 		if (net) {
3003 			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3004 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3005 			    cur_addr_num);
3006 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3007 			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3008 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3009 			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3010 		}
3011 		atomic_add_int(&sifa->refcount, 1);
3012 		return (sifa);
3013 	}
3014 #ifdef INET
3015 again_with_private_addresses_allowed:
3016 #endif
3017 	/* plan_c: do we have an acceptable address on the emit interface */
3018 	sifa = NULL;
3019 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3020 	if (emit_ifn == NULL) {
3021 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3022 		goto plan_d;
3023 	}
3024 	LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3025 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", sctp_ifa);
3026 		if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3027 		    (non_asoc_addr_ok == 0)) {
3028 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3029 			continue;
3030 		}
3031 		sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3032 		    dest_is_priv, fam);
3033 		if (sifa == NULL) {
3034 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3035 			continue;
3036 		}
3037 		if (stcb) {
3038 			if (sctp_is_address_in_scope(sifa,
3039 			    stcb->asoc.ipv4_addr_legal,
3040 			    stcb->asoc.ipv6_addr_legal,
3041 			    stcb->asoc.loopback_scope,
3042 			    stcb->asoc.ipv4_local_scope,
3043 			    stcb->asoc.local_scope,
3044 			    stcb->asoc.site_scope, 0) == 0) {
3045 				SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3046 				sifa = NULL;
3047 				continue;
3048 			}
3049 			if (((non_asoc_addr_ok == 0) &&
3050 			    (sctp_is_addr_restricted(stcb, sifa))) ||
3051 			    (non_asoc_addr_ok &&
3052 			    (sctp_is_addr_restricted(stcb, sifa)) &&
3053 			    (!sctp_is_addr_pending(stcb, sifa)))) {
3054 				/*
3055 				 * It is restricted for some reason..
3056 				 * probably not yet added.
3057 				 */
3058 				SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3059 				sifa = NULL;
3060 				continue;
3061 			}
3062 		} else {
3063 			SCTP_PRINTF("Stcb is null - no print\n");
3064 		}
3065 		atomic_add_int(&sifa->refcount, 1);
3066 		goto out;
3067 	}
3068 plan_d:
3069 	/*
3070 	 * plan_d: We are in trouble. No preferred address on the emit
3071 	 * interface. And not even a preferred address on all interfaces. Go
3072 	 * out and see if we can find an acceptable address somewhere
3073 	 * amongst all interfaces.
3074 	 */
3075 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", looked_at);
3076 	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3077 		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3078 			/* wrong base scope */
3079 			continue;
3080 		}
3081 		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3082 			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3083 			    (non_asoc_addr_ok == 0))
3084 				continue;
3085 			sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3086 			    dest_is_loop,
3087 			    dest_is_priv, fam);
3088 			if (sifa == NULL)
3089 				continue;
3090 			if (stcb) {
3091 				if (sctp_is_address_in_scope(sifa,
3092 				    stcb->asoc.ipv4_addr_legal,
3093 				    stcb->asoc.ipv6_addr_legal,
3094 				    stcb->asoc.loopback_scope,
3095 				    stcb->asoc.ipv4_local_scope,
3096 				    stcb->asoc.local_scope,
3097 				    stcb->asoc.site_scope, 0) == 0) {
3098 					sifa = NULL;
3099 					continue;
3100 				}
3101 				if (((non_asoc_addr_ok == 0) &&
3102 				    (sctp_is_addr_restricted(stcb, sifa))) ||
3103 				    (non_asoc_addr_ok &&
3104 				    (sctp_is_addr_restricted(stcb, sifa)) &&
3105 				    (!sctp_is_addr_pending(stcb, sifa)))) {
3106 					/*
3107 					 * It is restricted for some
3108 					 * reason.. probably not yet added.
3109 					 */
3110 					sifa = NULL;
3111 					continue;
3112 				}
3113 			}
3114 			goto out;
3115 		}
3116 	}
3117 #ifdef INET
3118 	if ((retried == 0) && (stcb->asoc.ipv4_local_scope == 0)) {
3119 		stcb->asoc.ipv4_local_scope = 1;
3120 		retried = 1;
3121 		goto again_with_private_addresses_allowed;
3122 	} else if (retried == 1) {
3123 		stcb->asoc.ipv4_local_scope = 0;
3124 	}
3125 #endif
3126 out:
3127 #ifdef INET
3128 	if (sifa) {
3129 		if (retried == 1) {
3130 			LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3131 				if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3132 					/* wrong base scope */
3133 					continue;
3134 				}
3135 				LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3136 					struct sctp_ifa *tmp_sifa;
3137 
3138 					if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3139 					    (non_asoc_addr_ok == 0))
3140 						continue;
3141 					tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3142 					    dest_is_loop,
3143 					    dest_is_priv, fam);
3144 					if (tmp_sifa == NULL) {
3145 						continue;
3146 					}
3147 					if (tmp_sifa == sifa) {
3148 						continue;
3149 					}
3150 					if (stcb) {
3151 						if (sctp_is_address_in_scope(tmp_sifa,
3152 						    stcb->asoc.ipv4_addr_legal,
3153 						    stcb->asoc.ipv6_addr_legal,
3154 						    stcb->asoc.loopback_scope,
3155 						    stcb->asoc.ipv4_local_scope,
3156 						    stcb->asoc.local_scope,
3157 						    stcb->asoc.site_scope, 0) == 0) {
3158 							continue;
3159 						}
3160 						if (((non_asoc_addr_ok == 0) &&
3161 						    (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3162 						    (non_asoc_addr_ok &&
3163 						    (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3164 						    (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3165 							/*
3166 							 * It is restricted
3167 							 * for some reason..
3168 							 * probably not yet
3169 							 * added.
3170 							 */
3171 							continue;
3172 						}
3173 					}
3174 					if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3175 					    (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3176 						sctp_add_local_addr_restricted(stcb, tmp_sifa);
3177 					}
3178 				}
3179 			}
3180 		}
3181 		atomic_add_int(&sifa->refcount, 1);
3182 	}
3183 #endif
3184 	return (sifa);
3185 }
3186 
3187 
3188 
3189 /* tcb may be NULL */
3190 struct sctp_ifa *
3191 sctp_source_address_selection(struct sctp_inpcb *inp,
3192     struct sctp_tcb *stcb,
3193     sctp_route_t * ro,
3194     struct sctp_nets *net,
3195     int non_asoc_addr_ok, uint32_t vrf_id)
3196 {
3197 	struct sctp_ifa *answer;
3198 	uint8_t dest_is_priv, dest_is_loop;
3199 	sa_family_t fam;
3200 
3201 #ifdef INET
3202 	struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3203 
3204 #endif
3205 #ifdef INET6
3206 	struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3207 
3208 #endif
3209 
3210 	/**
3211 	 * Rules: - Find the route if needed, cache if I can. - Look at
3212 	 * interface address in route, Is it in the bound list. If so we
3213 	 * have the best source. - If not we must rotate amongst the
3214 	 * addresses.
3215 	 *
3216 	 * Cavets and issues
3217 	 *
3218 	 * Do we need to pay attention to scope. We can have a private address
3219 	 * or a global address we are sourcing or sending to. So if we draw
3220 	 * it out
3221 	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3222 	 * For V4
3223 	 * ------------------------------------------
3224 	 *      source     *      dest  *  result
3225 	 * -----------------------------------------
3226 	 * <a>  Private    *    Global  *  NAT
3227 	 * -----------------------------------------
3228 	 * <b>  Private    *    Private *  No problem
3229 	 * -----------------------------------------
3230 	 * <c>  Global     *    Private *  Huh, How will this work?
3231 	 * -----------------------------------------
3232 	 * <d>  Global     *    Global  *  No Problem
3233 	 *------------------------------------------
3234 	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3235 	 * For V6
3236 	 *------------------------------------------
3237 	 *      source     *      dest  *  result
3238 	 * -----------------------------------------
3239 	 * <a>  Linklocal  *    Global  *
3240 	 * -----------------------------------------
3241 	 * <b>  Linklocal  * Linklocal  *  No problem
3242 	 * -----------------------------------------
3243 	 * <c>  Global     * Linklocal  *  Huh, How will this work?
3244 	 * -----------------------------------------
3245 	 * <d>  Global     *    Global  *  No Problem
3246 	 *------------------------------------------
3247 	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3248 	 *
3249 	 * And then we add to that what happens if there are multiple addresses
3250 	 * assigned to an interface. Remember the ifa on a ifn is a linked
3251 	 * list of addresses. So one interface can have more than one IP
3252 	 * address. What happens if we have both a private and a global
3253 	 * address? Do we then use context of destination to sort out which
3254 	 * one is best? And what about NAT's sending P->G may get you a NAT
3255 	 * translation, or should you select the G thats on the interface in
3256 	 * preference.
3257 	 *
3258 	 * Decisions:
3259 	 *
3260 	 * - count the number of addresses on the interface.
3261 	 * - if it is one, no problem except case <c>.
3262 	 *   For <a> we will assume a NAT out there.
3263 	 * - if there are more than one, then we need to worry about scope P
3264 	 *   or G. We should prefer G -> G and P -> P if possible.
3265 	 *   Then as a secondary fall back to mixed types G->P being a last
3266 	 *   ditch one.
3267 	 * - The above all works for bound all, but bound specific we need to
3268 	 *   use the same concept but instead only consider the bound
3269 	 *   addresses. If the bound set is NOT assigned to the interface then
3270 	 *   we must use rotation amongst the bound addresses..
3271 	 */
3272 	if (ro->ro_rt == NULL) {
3273 		/*
3274 		 * Need a route to cache.
3275 		 */
3276 		SCTP_RTALLOC(ro, vrf_id);
3277 	}
3278 	if (ro->ro_rt == NULL) {
3279 		return (NULL);
3280 	}
3281 	fam = ro->ro_dst.sa_family;
3282 	dest_is_priv = dest_is_loop = 0;
3283 	/* Setup our scopes for the destination */
3284 	switch (fam) {
3285 #ifdef INET
3286 	case AF_INET:
3287 		/* Scope based on outbound address */
3288 		if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3289 			dest_is_loop = 1;
3290 			if (net != NULL) {
3291 				/* mark it as local */
3292 				net->addr_is_local = 1;
3293 			}
3294 		} else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3295 			dest_is_priv = 1;
3296 		}
3297 		break;
3298 #endif
3299 #ifdef INET6
3300 	case AF_INET6:
3301 		/* Scope based on outbound address */
3302 		if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3303 		    SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3304 			/*
3305 			 * If the address is a loopback address, which
3306 			 * consists of "::1" OR "fe80::1%lo0", we are
3307 			 * loopback scope. But we don't use dest_is_priv
3308 			 * (link local addresses).
3309 			 */
3310 			dest_is_loop = 1;
3311 			if (net != NULL) {
3312 				/* mark it as local */
3313 				net->addr_is_local = 1;
3314 			}
3315 		} else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3316 			dest_is_priv = 1;
3317 		}
3318 		break;
3319 #endif
3320 	}
3321 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3322 	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3323 	SCTP_IPI_ADDR_RLOCK();
3324 	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3325 		/*
3326 		 * Bound all case
3327 		 */
3328 		answer = sctp_choose_boundall(stcb, net, ro, vrf_id,
3329 		    dest_is_priv, dest_is_loop,
3330 		    non_asoc_addr_ok, fam);
3331 		SCTP_IPI_ADDR_RUNLOCK();
3332 		return (answer);
3333 	}
3334 	/*
3335 	 * Subset bound case
3336 	 */
3337 	if (stcb) {
3338 		answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3339 		    vrf_id, dest_is_priv,
3340 		    dest_is_loop,
3341 		    non_asoc_addr_ok, fam);
3342 	} else {
3343 		answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3344 		    non_asoc_addr_ok,
3345 		    dest_is_priv,
3346 		    dest_is_loop, fam);
3347 	}
3348 	SCTP_IPI_ADDR_RUNLOCK();
3349 	return (answer);
3350 }
3351 
3352 static int
3353 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3354 {
3355 	struct cmsghdr cmh;
3356 	int tlen, at, found;
3357 	struct sctp_sndinfo sndinfo;
3358 	struct sctp_prinfo prinfo;
3359 	struct sctp_authinfo authinfo;
3360 
3361 	tlen = SCTP_BUF_LEN(control);
3362 	at = 0;
3363 	found = 0;
3364 	/*
3365 	 * Independent of how many mbufs, find the c_type inside the control
3366 	 * structure and copy out the data.
3367 	 */
3368 	while (at < tlen) {
3369 		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3370 			/* There is not enough room for one more. */
3371 			return (found);
3372 		}
3373 		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3374 		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3375 			/* We dont't have a complete CMSG header. */
3376 			return (found);
3377 		}
3378 		if (((int)cmh.cmsg_len + at) > tlen) {
3379 			/* We don't have the complete CMSG. */
3380 			return (found);
3381 		}
3382 		if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3383 		    ((c_type == cmh.cmsg_type) ||
3384 		    ((c_type == SCTP_SNDRCV) &&
3385 		    ((cmh.cmsg_type == SCTP_SNDINFO) ||
3386 		    (cmh.cmsg_type == SCTP_PRINFO) ||
3387 		    (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3388 			if (c_type == cmh.cmsg_type) {
3389 				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
3390 					return (found);
3391 				}
3392 				/* It is exactly what we want. Copy it out. */
3393 				m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), cpsize, (caddr_t)data);
3394 				return (1);
3395 			} else {
3396 				struct sctp_sndrcvinfo *sndrcvinfo;
3397 
3398 				sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3399 				if (found == 0) {
3400 					if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3401 						return (found);
3402 					}
3403 					memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3404 				}
3405 				switch (cmh.cmsg_type) {
3406 				case SCTP_SNDINFO:
3407 					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_sndinfo)) {
3408 						return (found);
3409 					}
3410 					m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3411 					sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3412 					sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3413 					sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3414 					sndrcvinfo->sinfo_context = sndinfo.snd_context;
3415 					sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3416 					break;
3417 				case SCTP_PRINFO:
3418 					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_prinfo)) {
3419 						return (found);
3420 					}
3421 					m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3422 					sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3423 					sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3424 					break;
3425 				case SCTP_AUTHINFO:
3426 					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_authinfo)) {
3427 						return (found);
3428 					}
3429 					m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3430 					sndrcvinfo->sinfo_keynumber_valid = 1;
3431 					sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3432 					break;
3433 				default:
3434 					return (found);
3435 				}
3436 				found = 1;
3437 			}
3438 		}
3439 		at += CMSG_ALIGN(cmh.cmsg_len);
3440 	}
3441 	return (found);
3442 }
3443 
3444 static int
3445 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3446 {
3447 	struct cmsghdr cmh;
3448 	int tlen, at;
3449 	struct sctp_initmsg initmsg;
3450 
3451 #ifdef INET
3452 	struct sockaddr_in sin;
3453 
3454 #endif
3455 #ifdef INET6
3456 	struct sockaddr_in6 sin6;
3457 
3458 #endif
3459 
3460 	tlen = SCTP_BUF_LEN(control);
3461 	at = 0;
3462 	while (at < tlen) {
3463 		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3464 			/* There is not enough room for one more. */
3465 			*error = EINVAL;
3466 			return (1);
3467 		}
3468 		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3469 		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3470 			/* We dont't have a complete CMSG header. */
3471 			*error = EINVAL;
3472 			return (1);
3473 		}
3474 		if (((int)cmh.cmsg_len + at) > tlen) {
3475 			/* We don't have the complete CMSG. */
3476 			*error = EINVAL;
3477 			return (1);
3478 		}
3479 		if (cmh.cmsg_level == IPPROTO_SCTP) {
3480 			switch (cmh.cmsg_type) {
3481 			case SCTP_INIT:
3482 				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_initmsg)) {
3483 					*error = EINVAL;
3484 					return (1);
3485 				}
3486 				m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3487 				if (initmsg.sinit_max_attempts)
3488 					stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3489 				if (initmsg.sinit_num_ostreams)
3490 					stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3491 				if (initmsg.sinit_max_instreams)
3492 					stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3493 				if (initmsg.sinit_max_init_timeo)
3494 					stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3495 				if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3496 					struct sctp_stream_out *tmp_str;
3497 					unsigned int i;
3498 
3499 					/* Default is NOT correct */
3500 					SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3501 					    stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3502 					SCTP_TCB_UNLOCK(stcb);
3503 					SCTP_MALLOC(tmp_str,
3504 					    struct sctp_stream_out *,
3505 					    (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3506 					    SCTP_M_STRMO);
3507 					SCTP_TCB_LOCK(stcb);
3508 					if (tmp_str != NULL) {
3509 						SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3510 						stcb->asoc.strmout = tmp_str;
3511 						stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3512 					} else {
3513 						stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3514 					}
3515 					for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3516 						stcb->asoc.strmout[i].next_sequence_sent = 0;
3517 						TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3518 						stcb->asoc.strmout[i].stream_no = i;
3519 						stcb->asoc.strmout[i].last_msg_incomplete = 0;
3520 						stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3521 					}
3522 				}
3523 				break;
3524 #ifdef INET
3525 			case SCTP_DSTADDRV4:
3526 				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in_addr)) {
3527 					*error = EINVAL;
3528 					return (1);
3529 				}
3530 				memset(&sin, 0, sizeof(struct sockaddr_in));
3531 				sin.sin_family = AF_INET;
3532 				sin.sin_len = sizeof(struct sockaddr_in);
3533 				sin.sin_port = stcb->rport;
3534 				m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3535 				if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3536 				    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3537 				    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3538 					*error = EINVAL;
3539 					return (1);
3540 				}
3541 				if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3542 				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3543 					*error = ENOBUFS;
3544 					return (1);
3545 				}
3546 				break;
3547 #endif
3548 #ifdef INET6
3549 			case SCTP_DSTADDRV6:
3550 				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in6_addr)) {
3551 					*error = EINVAL;
3552 					return (1);
3553 				}
3554 				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3555 				sin6.sin6_family = AF_INET6;
3556 				sin6.sin6_len = sizeof(struct sockaddr_in6);
3557 				sin6.sin6_port = stcb->rport;
3558 				m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3559 				if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3560 				    IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3561 					*error = EINVAL;
3562 					return (1);
3563 				}
3564 #ifdef INET
3565 				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3566 					in6_sin6_2_sin(&sin, &sin6);
3567 					if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3568 					    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3569 					    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3570 						*error = EINVAL;
3571 						return (1);
3572 					}
3573 					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3574 					    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3575 						*error = ENOBUFS;
3576 						return (1);
3577 					}
3578 				} else
3579 #endif
3580 					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3581 				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3582 					*error = ENOBUFS;
3583 					return (1);
3584 				}
3585 				break;
3586 #endif
3587 			default:
3588 				break;
3589 			}
3590 		}
3591 		at += CMSG_ALIGN(cmh.cmsg_len);
3592 	}
3593 	return (0);
3594 }
3595 
3596 static struct sctp_tcb *
3597 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3598     in_port_t port,
3599     struct mbuf *control,
3600     struct sctp_nets **net_p,
3601     int *error)
3602 {
3603 	struct cmsghdr cmh;
3604 	int tlen, at;
3605 	struct sctp_tcb *stcb;
3606 	struct sockaddr *addr;
3607 
3608 #ifdef INET
3609 	struct sockaddr_in sin;
3610 
3611 #endif
3612 #ifdef INET6
3613 	struct sockaddr_in6 sin6;
3614 
3615 #endif
3616 
3617 	tlen = SCTP_BUF_LEN(control);
3618 	at = 0;
3619 	while (at < tlen) {
3620 		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3621 			/* There is not enough room for one more. */
3622 			*error = EINVAL;
3623 			return (NULL);
3624 		}
3625 		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3626 		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3627 			/* We dont't have a complete CMSG header. */
3628 			*error = EINVAL;
3629 			return (NULL);
3630 		}
3631 		if (((int)cmh.cmsg_len + at) > tlen) {
3632 			/* We don't have the complete CMSG. */
3633 			*error = EINVAL;
3634 			return (NULL);
3635 		}
3636 		if (cmh.cmsg_level == IPPROTO_SCTP) {
3637 			switch (cmh.cmsg_type) {
3638 #ifdef INET
3639 			case SCTP_DSTADDRV4:
3640 				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in_addr)) {
3641 					*error = EINVAL;
3642 					return (NULL);
3643 				}
3644 				memset(&sin, 0, sizeof(struct sockaddr_in));
3645 				sin.sin_family = AF_INET;
3646 				sin.sin_len = sizeof(struct sockaddr_in);
3647 				sin.sin_port = port;
3648 				m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3649 				addr = (struct sockaddr *)&sin;
3650 				break;
3651 #endif
3652 #ifdef INET6
3653 			case SCTP_DSTADDRV6:
3654 				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in6_addr)) {
3655 					*error = EINVAL;
3656 					return (NULL);
3657 				}
3658 				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3659 				sin6.sin6_family = AF_INET6;
3660 				sin6.sin6_len = sizeof(struct sockaddr_in6);
3661 				sin6.sin6_port = port;
3662 				m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3663 #ifdef INET
3664 				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3665 					in6_sin6_2_sin(&sin, &sin6);
3666 					addr = (struct sockaddr *)&sin;
3667 				} else
3668 #endif
3669 					addr = (struct sockaddr *)&sin6;
3670 				break;
3671 #endif
3672 			default:
3673 				addr = NULL;
3674 				break;
3675 			}
3676 			if (addr) {
3677 				stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3678 				if (stcb != NULL) {
3679 					return (stcb);
3680 				}
3681 			}
3682 		}
3683 		at += CMSG_ALIGN(cmh.cmsg_len);
3684 	}
3685 	return (NULL);
3686 }
3687 
3688 static struct mbuf *
3689 sctp_add_cookie(struct mbuf *init, int init_offset,
3690     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3691 {
3692 	struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3693 	struct sctp_state_cookie *stc;
3694 	struct sctp_paramhdr *ph;
3695 	uint8_t *foo;
3696 	int sig_offset;
3697 	uint16_t cookie_sz;
3698 
3699 	mret = NULL;
3700 	mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3701 	    sizeof(struct sctp_paramhdr)), 0,
3702 	    M_DONTWAIT, 1, MT_DATA);
3703 	if (mret == NULL) {
3704 		return (NULL);
3705 	}
3706 	copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3707 	if (copy_init == NULL) {
3708 		sctp_m_freem(mret);
3709 		return (NULL);
3710 	}
3711 #ifdef SCTP_MBUF_LOGGING
3712 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3713 		struct mbuf *mat;
3714 
3715 		for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3716 			if (SCTP_BUF_IS_EXTENDED(mat)) {
3717 				sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3718 			}
3719 		}
3720 	}
3721 #endif
3722 	copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3723 	    M_DONTWAIT);
3724 	if (copy_initack == NULL) {
3725 		sctp_m_freem(mret);
3726 		sctp_m_freem(copy_init);
3727 		return (NULL);
3728 	}
3729 #ifdef SCTP_MBUF_LOGGING
3730 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3731 		struct mbuf *mat;
3732 
3733 		for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3734 			if (SCTP_BUF_IS_EXTENDED(mat)) {
3735 				sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3736 			}
3737 		}
3738 	}
3739 #endif
3740 	/* easy side we just drop it on the end */
3741 	ph = mtod(mret, struct sctp_paramhdr *);
3742 	SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3743 	    sizeof(struct sctp_paramhdr);
3744 	stc = (struct sctp_state_cookie *)((caddr_t)ph +
3745 	    sizeof(struct sctp_paramhdr));
3746 	ph->param_type = htons(SCTP_STATE_COOKIE);
3747 	ph->param_length = 0;	/* fill in at the end */
3748 	/* Fill in the stc cookie data */
3749 	memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3750 
3751 	/* tack the INIT and then the INIT-ACK onto the chain */
3752 	cookie_sz = 0;
3753 	for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3754 		cookie_sz += SCTP_BUF_LEN(m_at);
3755 		if (SCTP_BUF_NEXT(m_at) == NULL) {
3756 			SCTP_BUF_NEXT(m_at) = copy_init;
3757 			break;
3758 		}
3759 	}
3760 	for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3761 		cookie_sz += SCTP_BUF_LEN(m_at);
3762 		if (SCTP_BUF_NEXT(m_at) == NULL) {
3763 			SCTP_BUF_NEXT(m_at) = copy_initack;
3764 			break;
3765 		}
3766 	}
3767 	for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3768 		cookie_sz += SCTP_BUF_LEN(m_at);
3769 		if (SCTP_BUF_NEXT(m_at) == NULL) {
3770 			break;
3771 		}
3772 	}
3773 	sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3774 	if (sig == NULL) {
3775 		/* no space, so free the entire chain */
3776 		sctp_m_freem(mret);
3777 		return (NULL);
3778 	}
3779 	SCTP_BUF_LEN(sig) = 0;
3780 	SCTP_BUF_NEXT(m_at) = sig;
3781 	sig_offset = 0;
3782 	foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3783 	memset(foo, 0, SCTP_SIGNATURE_SIZE);
3784 	*signature = foo;
3785 	SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3786 	cookie_sz += SCTP_SIGNATURE_SIZE;
3787 	ph->param_length = htons(cookie_sz);
3788 	return (mret);
3789 }
3790 
3791 
3792 static uint8_t
3793 sctp_get_ect(struct sctp_tcb *stcb)
3794 {
3795 	if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3796 		return (SCTP_ECT0_BIT);
3797 	} else {
3798 		return (0);
3799 	}
3800 }
3801 
3802 static void
3803 sctp_handle_no_route(struct sctp_tcb *stcb,
3804     struct sctp_nets *net,
3805     int so_locked)
3806 {
3807 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3808 
3809 	if (net) {
3810 		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3811 		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3812 		if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3813 			if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3814 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
3815 				sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3816 				    stcb, 0,
3817 				    (void *)net,
3818 				    so_locked);
3819 				net->dest_state &= ~SCTP_ADDR_REACHABLE;
3820 				net->dest_state &= ~SCTP_ADDR_PF;
3821 			}
3822 		}
3823 		if (stcb) {
3824 			if (net == stcb->asoc.primary_destination) {
3825 				/* need a new primary */
3826 				struct sctp_nets *alt;
3827 
3828 				alt = sctp_find_alternate_net(stcb, net, 0);
3829 				if (alt != net) {
3830 					if (stcb->asoc.alternate) {
3831 						sctp_free_remote_addr(stcb->asoc.alternate);
3832 					}
3833 					stcb->asoc.alternate = alt;
3834 					atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3835 					if (net->ro._s_addr) {
3836 						sctp_free_ifa(net->ro._s_addr);
3837 						net->ro._s_addr = NULL;
3838 					}
3839 					net->src_addr_selected = 0;
3840 				}
3841 			}
3842 		}
3843 	}
3844 }
3845 
3846 static int
3847 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3848     struct sctp_tcb *stcb,	/* may be NULL */
3849     struct sctp_nets *net,
3850     struct sockaddr *to,
3851     struct mbuf *m,
3852     uint32_t auth_offset,
3853     struct sctp_auth_chunk *auth,
3854     uint16_t auth_keyid,
3855     int nofragment_flag,
3856     int ecn_ok,
3857     int out_of_asoc_ok,
3858     uint16_t src_port,
3859     uint16_t dest_port,
3860     uint32_t v_tag,
3861     uint16_t port,
3862 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3863     int so_locked SCTP_UNUSED,
3864 #else
3865     int so_locked,
3866 #endif
3867     union sctp_sockstore *over_addr,
3868     struct mbuf *init
3869 )
3870 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3871 {
3872 	/**
3873 	 * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3874 	 * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3875 	 * - fill in the HMAC digest of any AUTH chunk in the packet.
3876 	 * - calculate and fill in the SCTP checksum.
3877 	 * - prepend an IP address header.
3878 	 * - if boundall use INADDR_ANY.
3879 	 * - if boundspecific do source address selection.
3880 	 * - set fragmentation option for ipV4.
3881 	 * - On return from IP output, check/adjust mtu size of output
3882 	 *   interface and smallest_mtu size as well.
3883 	 */
3884 	/* Will need ifdefs around this */
3885 	struct mbuf *o_pak;
3886 	struct mbuf *newm;
3887 	struct sctphdr *sctphdr;
3888 	int packet_length;
3889 	int ret;
3890 	uint32_t vrf_id;
3891 	sctp_route_t *ro = NULL;
3892 	struct udphdr *udp = NULL;
3893 	uint8_t tos_value;
3894 
3895 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3896 	struct socket *so = NULL;
3897 
3898 #endif
3899 
3900 	if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3901 		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3902 		sctp_m_freem(m);
3903 		return (EFAULT);
3904 	}
3905 	if (stcb) {
3906 		vrf_id = stcb->asoc.vrf_id;
3907 	} else {
3908 		vrf_id = inp->def_vrf_id;
3909 	}
3910 
3911 	/* fill in the HMAC digest for any AUTH chunk in the packet */
3912 	if ((auth != NULL) && (stcb != NULL)) {
3913 		sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3914 	}
3915 	if (net) {
3916 		tos_value = net->dscp;
3917 	} else if (stcb) {
3918 		tos_value = stcb->asoc.default_dscp;
3919 	} else {
3920 		tos_value = inp->sctp_ep.default_dscp;
3921 	}
3922 
3923 	switch (to->sa_family) {
3924 #ifdef INET
3925 	case AF_INET:
3926 		{
3927 			struct ip *ip = NULL;
3928 			sctp_route_t iproute;
3929 			int len;
3930 
3931 			len = sizeof(struct ip) + sizeof(struct sctphdr);
3932 			if (port) {
3933 				len += sizeof(struct udphdr);
3934 			}
3935 			newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3936 			if (newm == NULL) {
3937 				sctp_m_freem(m);
3938 				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3939 				return (ENOMEM);
3940 			}
3941 			SCTP_ALIGN_TO_END(newm, len);
3942 			SCTP_BUF_LEN(newm) = len;
3943 			SCTP_BUF_NEXT(newm) = m;
3944 			m = newm;
3945 			if (net != NULL) {
3946 #ifdef INVARIANTS
3947 				if (net->flowidset == 0) {
3948 					panic("Flow ID not set");
3949 				}
3950 #endif
3951 				m->m_pkthdr.flowid = net->flowid;
3952 				m->m_flags |= M_FLOWID;
3953 			} else {
3954 				if ((init != NULL) && (init->m_flags & M_FLOWID)) {
3955 					m->m_pkthdr.flowid = init->m_pkthdr.flowid;
3956 					m->m_flags |= M_FLOWID;
3957 				}
3958 			}
3959 			packet_length = sctp_calculate_len(m);
3960 			ip = mtod(m, struct ip *);
3961 			ip->ip_v = IPVERSION;
3962 			ip->ip_hl = (sizeof(struct ip) >> 2);
3963 			if (tos_value == 0) {
3964 				/*
3965 				 * This means especially, that it is not set
3966 				 * at the SCTP layer. So use the value from
3967 				 * the IP layer.
3968 				 */
3969 				tos_value = inp->ip_inp.inp.inp_ip_tos;
3970 			}
3971 			tos_value &= 0xfc;
3972 			if (ecn_ok) {
3973 				tos_value |= sctp_get_ect(stcb);
3974 			}
3975 			if ((nofragment_flag) && (port == 0)) {
3976 				ip->ip_off = IP_DF;
3977 			} else
3978 				ip->ip_off = 0;
3979 
3980 			/* FreeBSD has a function for ip_id's */
3981 			ip->ip_id = ip_newid();
3982 
3983 			ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3984 			ip->ip_len = packet_length;
3985 			ip->ip_tos = tos_value;
3986 			if (port) {
3987 				ip->ip_p = IPPROTO_UDP;
3988 			} else {
3989 				ip->ip_p = IPPROTO_SCTP;
3990 			}
3991 			ip->ip_sum = 0;
3992 			if (net == NULL) {
3993 				ro = &iproute;
3994 				memset(&iproute, 0, sizeof(iproute));
3995 				memcpy(&ro->ro_dst, to, to->sa_len);
3996 			} else {
3997 				ro = (sctp_route_t *) & net->ro;
3998 			}
3999 			/* Now the address selection part */
4000 			ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4001 
4002 			/* call the routine to select the src address */
4003 			if (net && out_of_asoc_ok == 0) {
4004 				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4005 					sctp_free_ifa(net->ro._s_addr);
4006 					net->ro._s_addr = NULL;
4007 					net->src_addr_selected = 0;
4008 					if (ro->ro_rt) {
4009 						RTFREE(ro->ro_rt);
4010 						ro->ro_rt = NULL;
4011 					}
4012 				}
4013 				if (net->src_addr_selected == 0) {
4014 					/* Cache the source address */
4015 					net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4016 					    ro, net, 0,
4017 					    vrf_id);
4018 					net->src_addr_selected = 1;
4019 				}
4020 				if (net->ro._s_addr == NULL) {
4021 					/* No route to host */
4022 					net->src_addr_selected = 0;
4023 					sctp_handle_no_route(stcb, net, so_locked);
4024 					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4025 					sctp_m_freem(m);
4026 					return (EHOSTUNREACH);
4027 				}
4028 				ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4029 			} else {
4030 				if (over_addr == NULL) {
4031 					struct sctp_ifa *_lsrc;
4032 
4033 					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4034 					    net,
4035 					    out_of_asoc_ok,
4036 					    vrf_id);
4037 					if (_lsrc == NULL) {
4038 						sctp_handle_no_route(stcb, net, so_locked);
4039 						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4040 						sctp_m_freem(m);
4041 						return (EHOSTUNREACH);
4042 					}
4043 					ip->ip_src = _lsrc->address.sin.sin_addr;
4044 					sctp_free_ifa(_lsrc);
4045 				} else {
4046 					ip->ip_src = over_addr->sin.sin_addr;
4047 					SCTP_RTALLOC(ro, vrf_id);
4048 				}
4049 			}
4050 			if (port) {
4051 				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4052 					sctp_handle_no_route(stcb, net, so_locked);
4053 					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4054 					sctp_m_freem(m);
4055 					return (EHOSTUNREACH);
4056 				}
4057 				udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4058 				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4059 				udp->uh_dport = port;
4060 				udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4061 				if (V_udp_cksum) {
4062 					udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4063 				} else {
4064 					udp->uh_sum = 0;
4065 				}
4066 				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4067 			} else {
4068 				sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4069 			}
4070 
4071 			sctphdr->src_port = src_port;
4072 			sctphdr->dest_port = dest_port;
4073 			sctphdr->v_tag = v_tag;
4074 			sctphdr->checksum = 0;
4075 
4076 			/*
4077 			 * If source address selection fails and we find no
4078 			 * route then the ip_output should fail as well with
4079 			 * a NO_ROUTE_TO_HOST type error. We probably should
4080 			 * catch that somewhere and abort the association
4081 			 * right away (assuming this is an INIT being sent).
4082 			 */
4083 			if (ro->ro_rt == NULL) {
4084 				/*
4085 				 * src addr selection failed to find a route
4086 				 * (or valid source addr), so we can't get
4087 				 * there from here (yet)!
4088 				 */
4089 				sctp_handle_no_route(stcb, net, so_locked);
4090 				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4091 				sctp_m_freem(m);
4092 				return (EHOSTUNREACH);
4093 			}
4094 			if (ro != &iproute) {
4095 				memcpy(&iproute, ro, sizeof(*ro));
4096 			}
4097 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4098 			    (uint32_t) (ntohl(ip->ip_src.s_addr)));
4099 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4100 			    (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4101 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4102 			    ro->ro_rt);
4103 
4104 			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4105 				/* failed to prepend data, give up */
4106 				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4107 				sctp_m_freem(m);
4108 				return (ENOMEM);
4109 			}
4110 #ifdef  SCTP_PACKET_LOGGING
4111 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4112 				sctp_packet_log(m, packet_length);
4113 #endif
4114 			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4115 			if (port) {
4116 #if defined(SCTP_WITH_NO_CSUM)
4117 				SCTP_STAT_INCR(sctps_sendnocrc);
4118 #else
4119 				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4120 				SCTP_STAT_INCR(sctps_sendswcrc);
4121 #endif
4122 				if (V_udp_cksum) {
4123 					SCTP_ENABLE_UDP_CSUM(o_pak);
4124 				}
4125 			} else {
4126 #if defined(SCTP_WITH_NO_CSUM)
4127 				SCTP_STAT_INCR(sctps_sendnocrc);
4128 #else
4129 				m->m_pkthdr.csum_flags = CSUM_SCTP;
4130 				m->m_pkthdr.csum_data = 0;
4131 				SCTP_STAT_INCR(sctps_sendhwcrc);
4132 #endif
4133 			}
4134 			/* send it out.  table id is taken from stcb */
4135 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4136 			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4137 				so = SCTP_INP_SO(inp);
4138 				SCTP_SOCKET_UNLOCK(so, 0);
4139 			}
4140 #endif
4141 			SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4142 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4143 			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4144 				atomic_add_int(&stcb->asoc.refcnt, 1);
4145 				SCTP_TCB_UNLOCK(stcb);
4146 				SCTP_SOCKET_LOCK(so, 0);
4147 				SCTP_TCB_LOCK(stcb);
4148 				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4149 			}
4150 #endif
4151 			SCTP_STAT_INCR(sctps_sendpackets);
4152 			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4153 			if (ret)
4154 				SCTP_STAT_INCR(sctps_senderrors);
4155 
4156 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4157 			if (net == NULL) {
4158 				/* free tempy routes */
4159 				if (ro->ro_rt) {
4160 					RTFREE(ro->ro_rt);
4161 					ro->ro_rt = NULL;
4162 				}
4163 			} else {
4164 				/*
4165 				 * PMTU check versus smallest asoc MTU goes
4166 				 * here
4167 				 */
4168 				if ((ro->ro_rt != NULL) &&
4169 				    (net->ro._s_addr)) {
4170 					uint32_t mtu;
4171 
4172 					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4173 					if (net->port) {
4174 						mtu -= sizeof(struct udphdr);
4175 					}
4176 					if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4177 						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4178 						net->mtu = mtu;
4179 					}
4180 				} else if (ro->ro_rt == NULL) {
4181 					/* route was freed */
4182 					if (net->ro._s_addr &&
4183 					    net->src_addr_selected) {
4184 						sctp_free_ifa(net->ro._s_addr);
4185 						net->ro._s_addr = NULL;
4186 					}
4187 					net->src_addr_selected = 0;
4188 				}
4189 			}
4190 			return (ret);
4191 		}
4192 #endif
4193 #ifdef INET6
4194 	case AF_INET6:
4195 		{
4196 			uint32_t flowlabel, flowinfo;
4197 			struct ip6_hdr *ip6h;
4198 			struct route_in6 ip6route;
4199 			struct ifnet *ifp;
4200 			struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4201 			int prev_scope = 0;
4202 			struct sockaddr_in6 lsa6_storage;
4203 			int error;
4204 			u_short prev_port = 0;
4205 			int len;
4206 
4207 			if (net) {
4208 				flowlabel = net->flowlabel;
4209 			} else if (stcb) {
4210 				flowlabel = stcb->asoc.default_flowlabel;
4211 			} else {
4212 				flowlabel = inp->sctp_ep.default_flowlabel;
4213 			}
4214 			if (flowlabel == 0) {
4215 				/*
4216 				 * This means especially, that it is not set
4217 				 * at the SCTP layer. So use the value from
4218 				 * the IP layer.
4219 				 */
4220 				flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4221 			}
4222 			flowlabel &= 0x000fffff;
4223 			len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4224 			if (port) {
4225 				len += sizeof(struct udphdr);
4226 			}
4227 			newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4228 			if (newm == NULL) {
4229 				sctp_m_freem(m);
4230 				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4231 				return (ENOMEM);
4232 			}
4233 			SCTP_ALIGN_TO_END(newm, len);
4234 			SCTP_BUF_LEN(newm) = len;
4235 			SCTP_BUF_NEXT(newm) = m;
4236 			m = newm;
4237 			if (net != NULL) {
4238 #ifdef INVARIANTS
4239 				if (net->flowidset == 0) {
4240 					panic("Flow ID not set");
4241 				}
4242 #endif
4243 				m->m_pkthdr.flowid = net->flowid;
4244 				m->m_flags |= M_FLOWID;
4245 			} else {
4246 				if ((init != NULL) && (init->m_flags & M_FLOWID)) {
4247 					m->m_pkthdr.flowid = init->m_pkthdr.flowid;
4248 					m->m_flags |= M_FLOWID;
4249 				}
4250 			}
4251 			packet_length = sctp_calculate_len(m);
4252 
4253 			ip6h = mtod(m, struct ip6_hdr *);
4254 			/* protect *sin6 from overwrite */
4255 			sin6 = (struct sockaddr_in6 *)to;
4256 			tmp = *sin6;
4257 			sin6 = &tmp;
4258 
4259 			/* KAME hack: embed scopeid */
4260 			if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4261 				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4262 				return (EINVAL);
4263 			}
4264 			if (net == NULL) {
4265 				memset(&ip6route, 0, sizeof(ip6route));
4266 				ro = (sctp_route_t *) & ip6route;
4267 				memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4268 			} else {
4269 				ro = (sctp_route_t *) & net->ro;
4270 			}
4271 			/*
4272 			 * We assume here that inp_flow is in host byte
4273 			 * order within the TCB!
4274 			 */
4275 			if (tos_value == 0) {
4276 				/*
4277 				 * This means especially, that it is not set
4278 				 * at the SCTP layer. So use the value from
4279 				 * the IP layer.
4280 				 */
4281 				tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4282 			}
4283 			tos_value &= 0xfc;
4284 			if (ecn_ok) {
4285 				tos_value |= sctp_get_ect(stcb);
4286 			}
4287 			flowinfo = 0x06;
4288 			flowinfo <<= 8;
4289 			flowinfo |= tos_value;
4290 			flowinfo <<= 20;
4291 			flowinfo |= flowlabel;
4292 			ip6h->ip6_flow = htonl(flowinfo);
4293 			if (port) {
4294 				ip6h->ip6_nxt = IPPROTO_UDP;
4295 			} else {
4296 				ip6h->ip6_nxt = IPPROTO_SCTP;
4297 			}
4298 			ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4299 			ip6h->ip6_dst = sin6->sin6_addr;
4300 
4301 			/*
4302 			 * Add SRC address selection here: we can only reuse
4303 			 * to a limited degree the kame src-addr-sel, since
4304 			 * we can try their selection but it may not be
4305 			 * bound.
4306 			 */
4307 			bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4308 			lsa6_tmp.sin6_family = AF_INET6;
4309 			lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4310 			lsa6 = &lsa6_tmp;
4311 			if (net && out_of_asoc_ok == 0) {
4312 				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4313 					sctp_free_ifa(net->ro._s_addr);
4314 					net->ro._s_addr = NULL;
4315 					net->src_addr_selected = 0;
4316 					if (ro->ro_rt) {
4317 						RTFREE(ro->ro_rt);
4318 						ro->ro_rt = NULL;
4319 					}
4320 				}
4321 				if (net->src_addr_selected == 0) {
4322 					sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4323 					/* KAME hack: embed scopeid */
4324 					if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4325 						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4326 						return (EINVAL);
4327 					}
4328 					/* Cache the source address */
4329 					net->ro._s_addr = sctp_source_address_selection(inp,
4330 					    stcb,
4331 					    ro,
4332 					    net,
4333 					    0,
4334 					    vrf_id);
4335 					(void)sa6_recoverscope(sin6);
4336 					net->src_addr_selected = 1;
4337 				}
4338 				if (net->ro._s_addr == NULL) {
4339 					SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4340 					net->src_addr_selected = 0;
4341 					sctp_handle_no_route(stcb, net, so_locked);
4342 					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4343 					sctp_m_freem(m);
4344 					return (EHOSTUNREACH);
4345 				}
4346 				lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4347 			} else {
4348 				sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4349 				/* KAME hack: embed scopeid */
4350 				if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4351 					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4352 					return (EINVAL);
4353 				}
4354 				if (over_addr == NULL) {
4355 					struct sctp_ifa *_lsrc;
4356 
4357 					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4358 					    net,
4359 					    out_of_asoc_ok,
4360 					    vrf_id);
4361 					if (_lsrc == NULL) {
4362 						sctp_handle_no_route(stcb, net, so_locked);
4363 						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4364 						sctp_m_freem(m);
4365 						return (EHOSTUNREACH);
4366 					}
4367 					lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4368 					sctp_free_ifa(_lsrc);
4369 				} else {
4370 					lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4371 					SCTP_RTALLOC(ro, vrf_id);
4372 				}
4373 				(void)sa6_recoverscope(sin6);
4374 			}
4375 			lsa6->sin6_port = inp->sctp_lport;
4376 
4377 			if (ro->ro_rt == NULL) {
4378 				/*
4379 				 * src addr selection failed to find a route
4380 				 * (or valid source addr), so we can't get
4381 				 * there from here!
4382 				 */
4383 				sctp_handle_no_route(stcb, net, so_locked);
4384 				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4385 				sctp_m_freem(m);
4386 				return (EHOSTUNREACH);
4387 			}
4388 			/*
4389 			 * XXX: sa6 may not have a valid sin6_scope_id in
4390 			 * the non-SCOPEDROUTING case.
4391 			 */
4392 			bzero(&lsa6_storage, sizeof(lsa6_storage));
4393 			lsa6_storage.sin6_family = AF_INET6;
4394 			lsa6_storage.sin6_len = sizeof(lsa6_storage);
4395 			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4396 			if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4397 				SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4398 				sctp_m_freem(m);
4399 				return (error);
4400 			}
4401 			/* XXX */
4402 			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4403 			lsa6_storage.sin6_port = inp->sctp_lport;
4404 			lsa6 = &lsa6_storage;
4405 			ip6h->ip6_src = lsa6->sin6_addr;
4406 
4407 			if (port) {
4408 				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4409 					sctp_handle_no_route(stcb, net, so_locked);
4410 					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4411 					sctp_m_freem(m);
4412 					return (EHOSTUNREACH);
4413 				}
4414 				udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4415 				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4416 				udp->uh_dport = port;
4417 				udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4418 				udp->uh_sum = 0;
4419 				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4420 			} else {
4421 				sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4422 			}
4423 
4424 			sctphdr->src_port = src_port;
4425 			sctphdr->dest_port = dest_port;
4426 			sctphdr->v_tag = v_tag;
4427 			sctphdr->checksum = 0;
4428 
4429 			/*
4430 			 * We set the hop limit now since there is a good
4431 			 * chance that our ro pointer is now filled
4432 			 */
4433 			ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4434 			ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4435 
4436 #ifdef SCTP_DEBUG
4437 			/* Copy to be sure something bad is not happening */
4438 			sin6->sin6_addr = ip6h->ip6_dst;
4439 			lsa6->sin6_addr = ip6h->ip6_src;
4440 #endif
4441 
4442 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4443 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4444 			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4445 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4446 			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4447 			if (net) {
4448 				sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4449 				/*
4450 				 * preserve the port and scope for link
4451 				 * local send
4452 				 */
4453 				prev_scope = sin6->sin6_scope_id;
4454 				prev_port = sin6->sin6_port;
4455 			}
4456 			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4457 				/* failed to prepend data, give up */
4458 				sctp_m_freem(m);
4459 				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4460 				return (ENOMEM);
4461 			}
4462 #ifdef  SCTP_PACKET_LOGGING
4463 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4464 				sctp_packet_log(m, packet_length);
4465 #endif
4466 			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4467 			if (port) {
4468 #if defined(SCTP_WITH_NO_CSUM)
4469 				SCTP_STAT_INCR(sctps_sendnocrc);
4470 #else
4471 				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4472 				SCTP_STAT_INCR(sctps_sendswcrc);
4473 #endif
4474 				if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4475 					udp->uh_sum = 0xffff;
4476 				}
4477 			} else {
4478 #if defined(SCTP_WITH_NO_CSUM)
4479 				SCTP_STAT_INCR(sctps_sendnocrc);
4480 #else
4481 				m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4482 				m->m_pkthdr.csum_data = 0;
4483 				SCTP_STAT_INCR(sctps_sendhwcrc);
4484 #endif
4485 			}
4486 			/* send it out. table id is taken from stcb */
4487 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4488 			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4489 				so = SCTP_INP_SO(inp);
4490 				SCTP_SOCKET_UNLOCK(so, 0);
4491 			}
4492 #endif
4493 			SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4494 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4495 			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4496 				atomic_add_int(&stcb->asoc.refcnt, 1);
4497 				SCTP_TCB_UNLOCK(stcb);
4498 				SCTP_SOCKET_LOCK(so, 0);
4499 				SCTP_TCB_LOCK(stcb);
4500 				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4501 			}
4502 #endif
4503 			if (net) {
4504 				/* for link local this must be done */
4505 				sin6->sin6_scope_id = prev_scope;
4506 				sin6->sin6_port = prev_port;
4507 			}
4508 			SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4509 			SCTP_STAT_INCR(sctps_sendpackets);
4510 			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4511 			if (ret) {
4512 				SCTP_STAT_INCR(sctps_senderrors);
4513 			}
4514 			if (net == NULL) {
4515 				/* Now if we had a temp route free it */
4516 				if (ro->ro_rt) {
4517 					RTFREE(ro->ro_rt);
4518 				}
4519 			} else {
4520 				/*
4521 				 * PMTU check versus smallest asoc MTU goes
4522 				 * here
4523 				 */
4524 				if (ro->ro_rt == NULL) {
4525 					/* Route was freed */
4526 					if (net->ro._s_addr &&
4527 					    net->src_addr_selected) {
4528 						sctp_free_ifa(net->ro._s_addr);
4529 						net->ro._s_addr = NULL;
4530 					}
4531 					net->src_addr_selected = 0;
4532 				}
4533 				if ((ro->ro_rt != NULL) &&
4534 				    (net->ro._s_addr)) {
4535 					uint32_t mtu;
4536 
4537 					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4538 					if (mtu &&
4539 					    (stcb->asoc.smallest_mtu > mtu)) {
4540 						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4541 						net->mtu = mtu;
4542 						if (net->port) {
4543 							net->mtu -= sizeof(struct udphdr);
4544 						}
4545 					}
4546 				} else if (ifp) {
4547 					if (ND_IFINFO(ifp)->linkmtu &&
4548 					    (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4549 						sctp_mtu_size_reset(inp,
4550 						    &stcb->asoc,
4551 						    ND_IFINFO(ifp)->linkmtu);
4552 					}
4553 				}
4554 			}
4555 			return (ret);
4556 		}
4557 #endif
4558 	default:
4559 		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4560 		    ((struct sockaddr *)to)->sa_family);
4561 		sctp_m_freem(m);
4562 		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4563 		return (EFAULT);
4564 	}
4565 }
4566 
4567 
4568 void
4569 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4570 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4571     SCTP_UNUSED
4572 #endif
4573 )
4574 {
4575 	struct mbuf *m, *m_at, *mp_last;
4576 	struct sctp_nets *net;
4577 	struct sctp_init_chunk *init;
4578 	struct sctp_supported_addr_param *sup_addr;
4579 	struct sctp_adaptation_layer_indication *ali;
4580 	struct sctp_ecn_supported_param *ecn;
4581 	struct sctp_prsctp_supported_param *prsctp;
4582 	struct sctp_supported_chunk_types_param *pr_supported;
4583 	int cnt_inits_to = 0;
4584 	int padval, ret;
4585 	int num_ext;
4586 	int p_len;
4587 
4588 	/* INIT's always go to the primary (and usually ONLY address) */
4589 	mp_last = NULL;
4590 	net = stcb->asoc.primary_destination;
4591 	if (net == NULL) {
4592 		net = TAILQ_FIRST(&stcb->asoc.nets);
4593 		if (net == NULL) {
4594 			/* TSNH */
4595 			return;
4596 		}
4597 		/* we confirm any address we send an INIT to */
4598 		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4599 		(void)sctp_set_primary_addr(stcb, NULL, net);
4600 	} else {
4601 		/* we confirm any address we send an INIT to */
4602 		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4603 	}
4604 	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4605 #ifdef INET6
4606 	if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4607 		/*
4608 		 * special hook, if we are sending to link local it will not
4609 		 * show up in our private address count.
4610 		 */
4611 		struct sockaddr_in6 *sin6l;
4612 
4613 		sin6l = &net->ro._l_addr.sin6;
4614 		if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4615 			cnt_inits_to = 1;
4616 	}
4617 #endif
4618 	if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4619 		/* This case should not happen */
4620 		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4621 		return;
4622 	}
4623 	/* start the INIT timer */
4624 	sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4625 
4626 	m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4627 	if (m == NULL) {
4628 		/* No memory, INIT timer will re-attempt. */
4629 		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4630 		return;
4631 	}
4632 	SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4633 	/*
4634 	 * assume peer supports asconf in order to be able to queue local
4635 	 * address changes while an INIT is in flight and before the assoc
4636 	 * is established.
4637 	 */
4638 	stcb->asoc.peer_supports_asconf = 1;
4639 	/* Now lets put the SCTP header in place */
4640 	init = mtod(m, struct sctp_init_chunk *);
4641 	/* now the chunk header */
4642 	init->ch.chunk_type = SCTP_INITIATION;
4643 	init->ch.chunk_flags = 0;
4644 	/* fill in later from mbuf we build */
4645 	init->ch.chunk_length = 0;
4646 	/* place in my tag */
4647 	init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4648 	/* set up some of the credits. */
4649 	init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4650 	    SCTP_MINIMAL_RWND));
4651 
4652 	init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4653 	init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4654 	init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4655 	/* now the address restriction */
4656 	/* XXX Should we take the address family of the socket into account? */
4657 	sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4658 	    sizeof(*init));
4659 	sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4660 #ifdef INET6
4661 #ifdef INET
4662 	/* we support 2 types: IPv4/IPv6 */
4663 	sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + 2 * sizeof(uint16_t));
4664 	sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4665 	sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4666 #else
4667 	/* we support 1 type: IPv6 */
4668 	sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4669 	sup_addr->addr_type[0] = htons(SCTP_IPV6_ADDRESS);
4670 	sup_addr->addr_type[1] = htons(0);	/* this is the padding */
4671 #endif
4672 #else
4673 	/* we support 1 type: IPv4 */
4674 	sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4675 	sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4676 	sup_addr->addr_type[1] = htons(0);	/* this is the padding */
4677 #endif
4678 	SCTP_BUF_LEN(m) += sizeof(struct sctp_supported_addr_param);
4679 	/* adaptation layer indication parameter */
4680 	ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(struct sctp_supported_addr_param));
4681 	ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4682 	ali->ph.param_length = htons(sizeof(*ali));
4683 	ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4684 	SCTP_BUF_LEN(m) += sizeof(*ali);
4685 	ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4686 
4687 	if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4688 		/* Add NAT friendly parameter */
4689 		struct sctp_paramhdr *ph;
4690 
4691 		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4692 		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4693 		ph->param_length = htons(sizeof(struct sctp_paramhdr));
4694 		SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4695 		ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4696 	}
4697 	/* now any cookie time extensions */
4698 	if (stcb->asoc.cookie_preserve_req) {
4699 		struct sctp_cookie_perserve_param *cookie_preserve;
4700 
4701 		cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4702 		cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4703 		cookie_preserve->ph.param_length = htons(
4704 		    sizeof(*cookie_preserve));
4705 		cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4706 		SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4707 		ecn = (struct sctp_ecn_supported_param *)(
4708 		    (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4709 		stcb->asoc.cookie_preserve_req = 0;
4710 	}
4711 	/* ECN parameter */
4712 	if (stcb->asoc.ecn_allowed == 1) {
4713 		ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4714 		ecn->ph.param_length = htons(sizeof(*ecn));
4715 		SCTP_BUF_LEN(m) += sizeof(*ecn);
4716 		prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4717 		    sizeof(*ecn));
4718 	} else {
4719 		prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4720 	}
4721 	/* And now tell the peer we do pr-sctp */
4722 	prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4723 	prsctp->ph.param_length = htons(sizeof(*prsctp));
4724 	SCTP_BUF_LEN(m) += sizeof(*prsctp);
4725 
4726 	/* And now tell the peer we do all the extensions */
4727 	pr_supported = (struct sctp_supported_chunk_types_param *)
4728 	    ((caddr_t)prsctp + sizeof(*prsctp));
4729 	pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4730 	num_ext = 0;
4731 	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4732 	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4733 	pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4734 	pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4735 	pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4736 	if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4737 		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4738 	}
4739 	if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4740 		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4741 	}
4742 	p_len = sizeof(*pr_supported) + num_ext;
4743 	pr_supported->ph.param_length = htons(p_len);
4744 	bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4745 	SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4746 
4747 
4748 	/* add authentication parameters */
4749 	if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4750 		struct sctp_auth_random *randp;
4751 		struct sctp_auth_hmac_algo *hmacs;
4752 		struct sctp_auth_chunk_list *chunks;
4753 
4754 		/* attach RANDOM parameter, if available */
4755 		if (stcb->asoc.authinfo.random != NULL) {
4756 			randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4757 			p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4758 			/* random key already contains the header */
4759 			bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4760 			/* zero out any padding required */
4761 			bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4762 			SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4763 		}
4764 		/* add HMAC_ALGO parameter */
4765 		hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4766 		p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4767 		    (uint8_t *) hmacs->hmac_ids);
4768 		if (p_len > 0) {
4769 			p_len += sizeof(*hmacs);
4770 			hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4771 			hmacs->ph.param_length = htons(p_len);
4772 			/* zero out any padding required */
4773 			bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4774 			SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4775 		}
4776 		/* add CHUNKS parameter */
4777 		chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4778 		p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4779 		    chunks->chunk_types);
4780 		if (p_len > 0) {
4781 			p_len += sizeof(*chunks);
4782 			chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4783 			chunks->ph.param_length = htons(p_len);
4784 			/* zero out any padding required */
4785 			bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4786 			SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4787 		}
4788 	}
4789 	/* now the addresses */
4790 	{
4791 		struct sctp_scoping scp;
4792 
4793 		/*
4794 		 * To optimize this we could put the scoping stuff into a
4795 		 * structure and remove the individual uint8's from the
4796 		 * assoc structure. Then we could just sifa in the address
4797 		 * within the stcb. But for now this is a quick hack to get
4798 		 * the address stuff teased apart.
4799 		 */
4800 
4801 		scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4802 		scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4803 		scp.loopback_scope = stcb->asoc.loopback_scope;
4804 		scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4805 		scp.local_scope = stcb->asoc.local_scope;
4806 		scp.site_scope = stcb->asoc.site_scope;
4807 
4808 		sctp_add_addresses_to_i_ia(inp, stcb, &scp, m, cnt_inits_to);
4809 	}
4810 
4811 	/* calulate the size and update pkt header and chunk header */
4812 	p_len = 0;
4813 	for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4814 		if (SCTP_BUF_NEXT(m_at) == NULL)
4815 			mp_last = m_at;
4816 		p_len += SCTP_BUF_LEN(m_at);
4817 	}
4818 	init->ch.chunk_length = htons(p_len);
4819 	/*
4820 	 * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4821 	 * here since the timer will drive a retranmission.
4822 	 */
4823 
4824 	/* I don't expect this to execute but we will be safe here */
4825 	padval = p_len % 4;
4826 	if ((padval) && (mp_last)) {
4827 		/*
4828 		 * The compiler worries that mp_last may not be set even
4829 		 * though I think it is impossible :-> however we add
4830 		 * mp_last here just in case.
4831 		 */
4832 		ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4833 		if (ret) {
4834 			/* Houston we have a problem, no space */
4835 			sctp_m_freem(m);
4836 			return;
4837 		}
4838 	}
4839 	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4840 	ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4841 	    (struct sockaddr *)&net->ro._l_addr,
4842 	    m, 0, NULL, 0, 0, 0, 0,
4843 	    inp->sctp_lport, stcb->rport, htonl(0),
4844 	    net->port, so_locked, NULL, NULL);
4845 	SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4846 	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4847 	(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4848 }
4849 
4850 struct mbuf *
4851 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4852     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4853 {
4854 	/*
4855 	 * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4856 	 * being equal to the beginning of the params i.e. (iphlen +
4857 	 * sizeof(struct sctp_init_msg) parse through the parameters to the
4858 	 * end of the mbuf verifying that all parameters are known.
4859 	 *
4860 	 * For unknown parameters build and return a mbuf with
4861 	 * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4862 	 * processing this chunk stop, and set *abort_processing to 1.
4863 	 *
4864 	 * By having param_offset be pre-set to where parameters begin it is
4865 	 * hoped that this routine may be reused in the future by new
4866 	 * features.
4867 	 */
4868 	struct sctp_paramhdr *phdr, params;
4869 
4870 	struct mbuf *mat, *op_err;
4871 	char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4872 	int at, limit, pad_needed;
4873 	uint16_t ptype, plen, padded_size;
4874 	int err_at;
4875 
4876 	*abort_processing = 0;
4877 	mat = in_initpkt;
4878 	err_at = 0;
4879 	limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4880 	at = param_offset;
4881 	op_err = NULL;
4882 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4883 	phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4884 	while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4885 		ptype = ntohs(phdr->param_type);
4886 		plen = ntohs(phdr->param_length);
4887 		if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4888 			/* wacked parameter */
4889 			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4890 			goto invalid_size;
4891 		}
4892 		limit -= SCTP_SIZE32(plen);
4893 		/*-
4894 		 * All parameters for all chunks that we know/understand are
4895 		 * listed here. We process them other places and make
4896 		 * appropriate stop actions per the upper bits. However this
4897 		 * is the generic routine processor's can call to get back
4898 		 * an operr.. to either incorporate (init-ack) or send.
4899 		 */
4900 		padded_size = SCTP_SIZE32(plen);
4901 		switch (ptype) {
4902 			/* Param's with variable size */
4903 		case SCTP_HEARTBEAT_INFO:
4904 		case SCTP_STATE_COOKIE:
4905 		case SCTP_UNRECOG_PARAM:
4906 		case SCTP_ERROR_CAUSE_IND:
4907 			/* ok skip fwd */
4908 			at += padded_size;
4909 			break;
4910 			/* Param's with variable size within a range */
4911 		case SCTP_CHUNK_LIST:
4912 		case SCTP_SUPPORTED_CHUNK_EXT:
4913 			if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4914 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4915 				goto invalid_size;
4916 			}
4917 			at += padded_size;
4918 			break;
4919 		case SCTP_SUPPORTED_ADDRTYPE:
4920 			if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4921 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4922 				goto invalid_size;
4923 			}
4924 			at += padded_size;
4925 			break;
4926 		case SCTP_RANDOM:
4927 			if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4928 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4929 				goto invalid_size;
4930 			}
4931 			at += padded_size;
4932 			break;
4933 		case SCTP_SET_PRIM_ADDR:
4934 		case SCTP_DEL_IP_ADDRESS:
4935 		case SCTP_ADD_IP_ADDRESS:
4936 			if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4937 			    (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4938 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4939 				goto invalid_size;
4940 			}
4941 			at += padded_size;
4942 			break;
4943 			/* Param's with a fixed size */
4944 		case SCTP_IPV4_ADDRESS:
4945 			if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4946 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4947 				goto invalid_size;
4948 			}
4949 			at += padded_size;
4950 			break;
4951 		case SCTP_IPV6_ADDRESS:
4952 			if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4953 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4954 				goto invalid_size;
4955 			}
4956 			at += padded_size;
4957 			break;
4958 		case SCTP_COOKIE_PRESERVE:
4959 			if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4960 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4961 				goto invalid_size;
4962 			}
4963 			at += padded_size;
4964 			break;
4965 		case SCTP_HAS_NAT_SUPPORT:
4966 			*nat_friendly = 1;
4967 			/* fall through */
4968 		case SCTP_PRSCTP_SUPPORTED:
4969 
4970 			if (padded_size != sizeof(struct sctp_paramhdr)) {
4971 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4972 				goto invalid_size;
4973 			}
4974 			at += padded_size;
4975 			break;
4976 		case SCTP_ECN_CAPABLE:
4977 			if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4978 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4979 				goto invalid_size;
4980 			}
4981 			at += padded_size;
4982 			break;
4983 		case SCTP_ULP_ADAPTATION:
4984 			if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4985 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4986 				goto invalid_size;
4987 			}
4988 			at += padded_size;
4989 			break;
4990 		case SCTP_SUCCESS_REPORT:
4991 			if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4992 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4993 				goto invalid_size;
4994 			}
4995 			at += padded_size;
4996 			break;
4997 		case SCTP_HOSTNAME_ADDRESS:
4998 			{
4999 				/* We can NOT handle HOST NAME addresses!! */
5000 				int l_len;
5001 
5002 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5003 				*abort_processing = 1;
5004 				if (op_err == NULL) {
5005 					/* Ok need to try to get a mbuf */
5006 #ifdef INET6
5007 					l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5008 #else
5009 					l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5010 #endif
5011 					l_len += plen;
5012 					l_len += sizeof(struct sctp_paramhdr);
5013 					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5014 					if (op_err) {
5015 						SCTP_BUF_LEN(op_err) = 0;
5016 						/*
5017 						 * pre-reserve space for ip
5018 						 * and sctp header  and
5019 						 * chunk hdr
5020 						 */
5021 #ifdef INET6
5022 						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5023 #else
5024 						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5025 #endif
5026 						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5027 						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5028 					}
5029 				}
5030 				if (op_err) {
5031 					/* If we have space */
5032 					struct sctp_paramhdr s;
5033 
5034 					if (err_at % 4) {
5035 						uint32_t cpthis = 0;
5036 
5037 						pad_needed = 4 - (err_at % 4);
5038 						m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5039 						err_at += pad_needed;
5040 					}
5041 					s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5042 					s.param_length = htons(sizeof(s) + plen);
5043 					m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5044 					err_at += sizeof(s);
5045 					phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5046 					if (phdr == NULL) {
5047 						sctp_m_freem(op_err);
5048 						/*
5049 						 * we are out of memory but
5050 						 * we still need to have a
5051 						 * look at what to do (the
5052 						 * system is in trouble
5053 						 * though).
5054 						 */
5055 						return (NULL);
5056 					}
5057 					m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5058 				}
5059 				return (op_err);
5060 				break;
5061 			}
5062 		default:
5063 			/*
5064 			 * we do not recognize the parameter figure out what
5065 			 * we do.
5066 			 */
5067 			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5068 			if ((ptype & 0x4000) == 0x4000) {
5069 				/* Report bit is set?? */
5070 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5071 				if (op_err == NULL) {
5072 					int l_len;
5073 
5074 					/* Ok need to try to get an mbuf */
5075 #ifdef INET6
5076 					l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5077 #else
5078 					l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5079 #endif
5080 					l_len += plen;
5081 					l_len += sizeof(struct sctp_paramhdr);
5082 					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5083 					if (op_err) {
5084 						SCTP_BUF_LEN(op_err) = 0;
5085 #ifdef INET6
5086 						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5087 #else
5088 						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5089 #endif
5090 						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5091 						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5092 					}
5093 				}
5094 				if (op_err) {
5095 					/* If we have space */
5096 					struct sctp_paramhdr s;
5097 
5098 					if (err_at % 4) {
5099 						uint32_t cpthis = 0;
5100 
5101 						pad_needed = 4 - (err_at % 4);
5102 						m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5103 						err_at += pad_needed;
5104 					}
5105 					s.param_type = htons(SCTP_UNRECOG_PARAM);
5106 					s.param_length = htons(sizeof(s) + plen);
5107 					m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5108 					err_at += sizeof(s);
5109 					if (plen > sizeof(tempbuf)) {
5110 						plen = sizeof(tempbuf);
5111 					}
5112 					phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5113 					if (phdr == NULL) {
5114 						sctp_m_freem(op_err);
5115 						/*
5116 						 * we are out of memory but
5117 						 * we still need to have a
5118 						 * look at what to do (the
5119 						 * system is in trouble
5120 						 * though).
5121 						 */
5122 						op_err = NULL;
5123 						goto more_processing;
5124 					}
5125 					m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5126 					err_at += plen;
5127 				}
5128 			}
5129 	more_processing:
5130 			if ((ptype & 0x8000) == 0x0000) {
5131 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5132 				return (op_err);
5133 			} else {
5134 				/* skip this chunk and continue processing */
5135 				SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5136 				at += SCTP_SIZE32(plen);
5137 			}
5138 			break;
5139 
5140 		}
5141 		phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5142 	}
5143 	return (op_err);
5144 invalid_size:
5145 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5146 	*abort_processing = 1;
5147 	if ((op_err == NULL) && phdr) {
5148 		int l_len;
5149 
5150 #ifdef INET6
5151 		l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5152 #else
5153 		l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5154 #endif
5155 		l_len += (2 * sizeof(struct sctp_paramhdr));
5156 		op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5157 		if (op_err) {
5158 			SCTP_BUF_LEN(op_err) = 0;
5159 #ifdef INET6
5160 			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5161 #else
5162 			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5163 #endif
5164 			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5165 			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5166 		}
5167 	}
5168 	if ((op_err) && phdr) {
5169 		struct sctp_paramhdr s;
5170 
5171 		if (err_at % 4) {
5172 			uint32_t cpthis = 0;
5173 
5174 			pad_needed = 4 - (err_at % 4);
5175 			m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5176 			err_at += pad_needed;
5177 		}
5178 		s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5179 		s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5180 		m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5181 		err_at += sizeof(s);
5182 		/* Only copy back the p-hdr that caused the issue */
5183 		m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5184 	}
5185 	return (op_err);
5186 }
5187 
5188 static int
5189 sctp_are_there_new_addresses(struct sctp_association *asoc,
5190     struct mbuf *in_initpkt, int offset)
5191 {
5192 	/*
5193 	 * Given a INIT packet, look through the packet to verify that there
5194 	 * are NO new addresses. As we go through the parameters add reports
5195 	 * of any un-understood parameters that require an error.  Also we
5196 	 * must return (1) to drop the packet if we see a un-understood
5197 	 * parameter that tells us to drop the chunk.
5198 	 */
5199 	struct sockaddr *sa_touse;
5200 	struct sockaddr *sa;
5201 	struct sctp_paramhdr *phdr, params;
5202 	uint16_t ptype, plen;
5203 	uint8_t fnd;
5204 	struct sctp_nets *net;
5205 	struct ip *iph;
5206 
5207 #ifdef INET
5208 	struct sockaddr_in sin4, *sa4;
5209 
5210 #endif
5211 #ifdef INET6
5212 	struct sockaddr_in6 sin6, *sa6;
5213 	struct ip6_hdr *ip6h;
5214 
5215 #endif
5216 
5217 #ifdef INET
5218 	memset(&sin4, 0, sizeof(sin4));
5219 	sin4.sin_family = AF_INET;
5220 	sin4.sin_len = sizeof(sin4);
5221 #endif
5222 #ifdef INET6
5223 	memset(&sin6, 0, sizeof(sin6));
5224 	sin6.sin6_family = AF_INET6;
5225 	sin6.sin6_len = sizeof(sin6);
5226 #endif
5227 	sa_touse = NULL;
5228 	/* First what about the src address of the pkt ? */
5229 	iph = mtod(in_initpkt, struct ip *);
5230 	switch (iph->ip_v) {
5231 #ifdef INET
5232 	case IPVERSION:
5233 		/* source addr is IPv4 */
5234 		sin4.sin_addr = iph->ip_src;
5235 		sa_touse = (struct sockaddr *)&sin4;
5236 		break;
5237 #endif
5238 #ifdef INET6
5239 	case IPV6_VERSION >> 4:
5240 		/* source addr is IPv6 */
5241 		ip6h = mtod(in_initpkt, struct ip6_hdr *);
5242 		sin6.sin6_addr = ip6h->ip6_src;
5243 		sa_touse = (struct sockaddr *)&sin6;
5244 		break;
5245 #endif
5246 	default:
5247 		return (1);
5248 	}
5249 
5250 	fnd = 0;
5251 	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5252 		sa = (struct sockaddr *)&net->ro._l_addr;
5253 		if (sa->sa_family == sa_touse->sa_family) {
5254 #ifdef INET
5255 			if (sa->sa_family == AF_INET) {
5256 				sa4 = (struct sockaddr_in *)sa;
5257 				if (sa4->sin_addr.s_addr == sin4.sin_addr.s_addr) {
5258 					fnd = 1;
5259 					break;
5260 				}
5261 			}
5262 #endif
5263 #ifdef INET6
5264 			if (sa->sa_family == AF_INET6) {
5265 				sa6 = (struct sockaddr_in6 *)sa;
5266 				if (SCTP6_ARE_ADDR_EQUAL(sa6, &sin6)) {
5267 					fnd = 1;
5268 					break;
5269 				}
5270 			}
5271 #endif
5272 		}
5273 	}
5274 	if (fnd == 0) {
5275 		/* New address added! no need to look futher. */
5276 		return (1);
5277 	}
5278 	/* Ok so far lets munge through the rest of the packet */
5279 	offset += sizeof(struct sctp_init_chunk);
5280 	phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5281 	while (phdr) {
5282 		sa_touse = NULL;
5283 		ptype = ntohs(phdr->param_type);
5284 		plen = ntohs(phdr->param_length);
5285 		switch (ptype) {
5286 #ifdef INET
5287 		case SCTP_IPV4_ADDRESS:
5288 			{
5289 				struct sctp_ipv4addr_param *p4, p4_buf;
5290 
5291 				phdr = sctp_get_next_param(in_initpkt, offset,
5292 				    (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5293 				if (plen != sizeof(struct sctp_ipv4addr_param) ||
5294 				    phdr == NULL) {
5295 					return (1);
5296 				}
5297 				p4 = (struct sctp_ipv4addr_param *)phdr;
5298 				sin4.sin_addr.s_addr = p4->addr;
5299 				sa_touse = (struct sockaddr *)&sin4;
5300 				break;
5301 			}
5302 #endif
5303 #ifdef INET6
5304 		case SCTP_IPV6_ADDRESS:
5305 			{
5306 				struct sctp_ipv6addr_param *p6, p6_buf;
5307 
5308 				phdr = sctp_get_next_param(in_initpkt, offset,
5309 				    (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5310 				if (plen != sizeof(struct sctp_ipv6addr_param) ||
5311 				    phdr == NULL) {
5312 					return (1);
5313 				}
5314 				p6 = (struct sctp_ipv6addr_param *)phdr;
5315 				memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5316 				    sizeof(p6->addr));
5317 				sa_touse = (struct sockaddr *)&sin6;
5318 				break;
5319 			}
5320 #endif
5321 		default:
5322 			sa_touse = NULL;
5323 			break;
5324 		}
5325 		if (sa_touse) {
5326 			/* ok, sa_touse points to one to check */
5327 			fnd = 0;
5328 			TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5329 				sa = (struct sockaddr *)&net->ro._l_addr;
5330 				if (sa->sa_family != sa_touse->sa_family) {
5331 					continue;
5332 				}
5333 #ifdef INET
5334 				if (sa->sa_family == AF_INET) {
5335 					sa4 = (struct sockaddr_in *)sa;
5336 					if (sa4->sin_addr.s_addr ==
5337 					    sin4.sin_addr.s_addr) {
5338 						fnd = 1;
5339 						break;
5340 					}
5341 				}
5342 #endif
5343 #ifdef INET6
5344 				if (sa->sa_family == AF_INET6) {
5345 					sa6 = (struct sockaddr_in6 *)sa;
5346 					if (SCTP6_ARE_ADDR_EQUAL(
5347 					    sa6, &sin6)) {
5348 						fnd = 1;
5349 						break;
5350 					}
5351 				}
5352 #endif
5353 			}
5354 			if (!fnd) {
5355 				/* New addr added! no need to look further */
5356 				return (1);
5357 			}
5358 		}
5359 		offset += SCTP_SIZE32(plen);
5360 		phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5361 	}
5362 	return (0);
5363 }
5364 
5365 /*
5366  * Given a MBUF chain that was sent into us containing an INIT. Build a
5367  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5368  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5369  * message (i.e. the struct sctp_init_msg).
5370  */
5371 void
5372 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5373     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
5374     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5375 {
5376 	struct sctp_association *asoc;
5377 	struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5378 	struct sctp_init_ack_chunk *initack;
5379 	struct sctp_adaptation_layer_indication *ali;
5380 	struct sctp_ecn_supported_param *ecn;
5381 	struct sctp_prsctp_supported_param *prsctp;
5382 	struct sctp_supported_chunk_types_param *pr_supported;
5383 	union sctp_sockstore store, store1, *over_addr;
5384 
5385 #ifdef INET
5386 	struct sockaddr_in *sin, *to_sin;
5387 
5388 #endif
5389 #ifdef INET6
5390 	struct sockaddr_in6 *sin6, *to_sin6;
5391 
5392 #endif
5393 	struct ip *iph;
5394 
5395 #ifdef INET6
5396 	struct ip6_hdr *ip6;
5397 
5398 #endif
5399 	struct sockaddr *to;
5400 	struct sctp_state_cookie stc;
5401 	struct sctp_nets *net = NULL;
5402 	uint8_t *signature = NULL;
5403 	int cnt_inits_to = 0;
5404 	uint16_t his_limit, i_want;
5405 	int abort_flag, padval;
5406 	int num_ext;
5407 	int p_len;
5408 	int nat_friendly = 0;
5409 	struct socket *so;
5410 
5411 	if (stcb)
5412 		asoc = &stcb->asoc;
5413 	else
5414 		asoc = NULL;
5415 	mp_last = NULL;
5416 	if ((asoc != NULL) &&
5417 	    (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5418 	    (sctp_are_there_new_addresses(asoc, init_pkt, offset))) {
5419 		/* new addresses, out of here in non-cookie-wait states */
5420 		/*
5421 		 * Send a ABORT, we don't add the new address error clause
5422 		 * though we even set the T bit and copy in the 0 tag.. this
5423 		 * looks no different than if no listener was present.
5424 		 */
5425 		sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
5426 		return;
5427 	}
5428 	abort_flag = 0;
5429 	op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5430 	    (offset + sizeof(struct sctp_init_chunk)),
5431 	    &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5432 	if (abort_flag) {
5433 do_a_abort:
5434 		sctp_send_abort(init_pkt, iphlen, sh,
5435 		    init_chk->init.initiate_tag, op_err, vrf_id, port);
5436 		return;
5437 	}
5438 	m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5439 	if (m == NULL) {
5440 		/* No memory, INIT timer will re-attempt. */
5441 		if (op_err)
5442 			sctp_m_freem(op_err);
5443 		return;
5444 	}
5445 	SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5446 
5447 	/* the time I built cookie */
5448 	(void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5449 
5450 	/* populate any tie tags */
5451 	if (asoc != NULL) {
5452 		/* unlock before tag selections */
5453 		stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5454 		stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5455 		stc.cookie_life = asoc->cookie_life;
5456 		net = asoc->primary_destination;
5457 	} else {
5458 		stc.tie_tag_my_vtag = 0;
5459 		stc.tie_tag_peer_vtag = 0;
5460 		/* life I will award this cookie */
5461 		stc.cookie_life = inp->sctp_ep.def_cookie_life;
5462 	}
5463 
5464 	/* copy in the ports for later check */
5465 	stc.myport = sh->dest_port;
5466 	stc.peerport = sh->src_port;
5467 
5468 	/*
5469 	 * If we wanted to honor cookie life extentions, we would add to
5470 	 * stc.cookie_life. For now we should NOT honor any extension
5471 	 */
5472 	stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5473 	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5474 		struct inpcb *in_inp;
5475 
5476 		/* Its a V6 socket */
5477 		in_inp = (struct inpcb *)inp;
5478 		stc.ipv6_addr_legal = 1;
5479 		/* Now look at the binding flag to see if V4 will be legal */
5480 		if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5481 			stc.ipv4_addr_legal = 1;
5482 		} else {
5483 			/* V4 addresses are NOT legal on the association */
5484 			stc.ipv4_addr_legal = 0;
5485 		}
5486 	} else {
5487 		/* Its a V4 socket, no - V6 */
5488 		stc.ipv4_addr_legal = 1;
5489 		stc.ipv6_addr_legal = 0;
5490 	}
5491 
5492 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5493 	stc.ipv4_scope = 1;
5494 #else
5495 	stc.ipv4_scope = 0;
5496 #endif
5497 	/* now for scope setup */
5498 	memset((caddr_t)&store, 0, sizeof(store));
5499 	memset((caddr_t)&store1, 0, sizeof(store1));
5500 #ifdef INET
5501 	sin = &store.sin;
5502 	to_sin = &store1.sin;
5503 #endif
5504 #ifdef INET6
5505 	sin6 = &store.sin6;
5506 	to_sin6 = &store1.sin6;
5507 #endif
5508 	iph = mtod(init_pkt, struct ip *);
5509 	/* establish the to_addr's */
5510 	switch (iph->ip_v) {
5511 #ifdef INET
5512 	case IPVERSION:
5513 		to_sin->sin_port = sh->dest_port;
5514 		to_sin->sin_family = AF_INET;
5515 		to_sin->sin_len = sizeof(struct sockaddr_in);
5516 		to_sin->sin_addr = iph->ip_dst;
5517 		break;
5518 #endif
5519 #ifdef INET6
5520 	case IPV6_VERSION >> 4:
5521 		ip6 = mtod(init_pkt, struct ip6_hdr *);
5522 		to_sin6->sin6_addr = ip6->ip6_dst;
5523 		to_sin6->sin6_scope_id = 0;
5524 		to_sin6->sin6_port = sh->dest_port;
5525 		to_sin6->sin6_family = AF_INET6;
5526 		to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5527 		break;
5528 #endif
5529 	default:
5530 		goto do_a_abort;
5531 		break;
5532 	}
5533 
5534 	if (net == NULL) {
5535 		to = (struct sockaddr *)&store;
5536 		switch (iph->ip_v) {
5537 #ifdef INET
5538 		case IPVERSION:
5539 			{
5540 				sin->sin_family = AF_INET;
5541 				sin->sin_len = sizeof(struct sockaddr_in);
5542 				sin->sin_port = sh->src_port;
5543 				sin->sin_addr = iph->ip_src;
5544 				/* lookup address */
5545 				stc.address[0] = sin->sin_addr.s_addr;
5546 				stc.address[1] = 0;
5547 				stc.address[2] = 0;
5548 				stc.address[3] = 0;
5549 				stc.addr_type = SCTP_IPV4_ADDRESS;
5550 				/* local from address */
5551 				stc.laddress[0] = to_sin->sin_addr.s_addr;
5552 				stc.laddress[1] = 0;
5553 				stc.laddress[2] = 0;
5554 				stc.laddress[3] = 0;
5555 				stc.laddr_type = SCTP_IPV4_ADDRESS;
5556 				/* scope_id is only for v6 */
5557 				stc.scope_id = 0;
5558 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5559 				if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5560 					stc.ipv4_scope = 1;
5561 				}
5562 #else
5563 				stc.ipv4_scope = 1;
5564 #endif				/* SCTP_DONT_DO_PRIVADDR_SCOPE */
5565 				/* Must use the address in this case */
5566 				if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5567 					stc.loopback_scope = 1;
5568 					stc.ipv4_scope = 1;
5569 					stc.site_scope = 1;
5570 					stc.local_scope = 0;
5571 				}
5572 				break;
5573 			}
5574 #endif
5575 #ifdef INET6
5576 		case IPV6_VERSION >> 4:
5577 			{
5578 				ip6 = mtod(init_pkt, struct ip6_hdr *);
5579 				sin6->sin6_family = AF_INET6;
5580 				sin6->sin6_len = sizeof(struct sockaddr_in6);
5581 				sin6->sin6_port = sh->src_port;
5582 				sin6->sin6_addr = ip6->ip6_src;
5583 				/* lookup address */
5584 				memcpy(&stc.address, &sin6->sin6_addr,
5585 				    sizeof(struct in6_addr));
5586 				sin6->sin6_scope_id = 0;
5587 				stc.addr_type = SCTP_IPV6_ADDRESS;
5588 				stc.scope_id = 0;
5589 				if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5590 					/*
5591 					 * FIX ME: does this have scope from
5592 					 * rcvif?
5593 					 */
5594 					(void)sa6_recoverscope(sin6);
5595 					stc.scope_id = sin6->sin6_scope_id;
5596 					sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5597 					stc.loopback_scope = 1;
5598 					stc.local_scope = 0;
5599 					stc.site_scope = 1;
5600 					stc.ipv4_scope = 1;
5601 				} else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5602 					/*
5603 					 * If the new destination is a
5604 					 * LINK_LOCAL we must have common
5605 					 * both site and local scope. Don't
5606 					 * set local scope though since we
5607 					 * must depend on the source to be
5608 					 * added implicitly. We cannot
5609 					 * assure just because we share one
5610 					 * link that all links are common.
5611 					 */
5612 					stc.local_scope = 0;
5613 					stc.site_scope = 1;
5614 					stc.ipv4_scope = 1;
5615 					/*
5616 					 * we start counting for the private
5617 					 * address stuff at 1. since the
5618 					 * link local we source from won't
5619 					 * show up in our scoped count.
5620 					 */
5621 					cnt_inits_to = 1;
5622 					/*
5623 					 * pull out the scope_id from
5624 					 * incoming pkt
5625 					 */
5626 					/*
5627 					 * FIX ME: does this have scope from
5628 					 * rcvif?
5629 					 */
5630 					(void)sa6_recoverscope(sin6);
5631 					stc.scope_id = sin6->sin6_scope_id;
5632 					sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5633 				} else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5634 					/*
5635 					 * If the new destination is
5636 					 * SITE_LOCAL then we must have site
5637 					 * scope in common.
5638 					 */
5639 					stc.site_scope = 1;
5640 				}
5641 				memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5642 				stc.laddr_type = SCTP_IPV6_ADDRESS;
5643 				break;
5644 			}
5645 #endif
5646 		default:
5647 			/* TSNH */
5648 			goto do_a_abort;
5649 			break;
5650 		}
5651 	} else {
5652 		/* set the scope per the existing tcb */
5653 
5654 #ifdef INET6
5655 		struct sctp_nets *lnet;
5656 
5657 #endif
5658 
5659 		stc.loopback_scope = asoc->loopback_scope;
5660 		stc.ipv4_scope = asoc->ipv4_local_scope;
5661 		stc.site_scope = asoc->site_scope;
5662 		stc.local_scope = asoc->local_scope;
5663 #ifdef INET6
5664 		/* Why do we not consider IPv4 LL addresses? */
5665 		TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5666 			if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5667 				if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5668 					/*
5669 					 * if we have a LL address, start
5670 					 * counting at 1.
5671 					 */
5672 					cnt_inits_to = 1;
5673 				}
5674 			}
5675 		}
5676 #endif
5677 		/* use the net pointer */
5678 		to = (struct sockaddr *)&net->ro._l_addr;
5679 		switch (to->sa_family) {
5680 #ifdef INET
5681 		case AF_INET:
5682 			sin = (struct sockaddr_in *)to;
5683 			stc.address[0] = sin->sin_addr.s_addr;
5684 			stc.address[1] = 0;
5685 			stc.address[2] = 0;
5686 			stc.address[3] = 0;
5687 			stc.addr_type = SCTP_IPV4_ADDRESS;
5688 			if (net->src_addr_selected == 0) {
5689 				/*
5690 				 * strange case here, the INIT should have
5691 				 * did the selection.
5692 				 */
5693 				net->ro._s_addr = sctp_source_address_selection(inp,
5694 				    stcb, (sctp_route_t *) & net->ro,
5695 				    net, 0, vrf_id);
5696 				if (net->ro._s_addr == NULL)
5697 					return;
5698 
5699 				net->src_addr_selected = 1;
5700 
5701 			}
5702 			stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5703 			stc.laddress[1] = 0;
5704 			stc.laddress[2] = 0;
5705 			stc.laddress[3] = 0;
5706 			stc.laddr_type = SCTP_IPV4_ADDRESS;
5707 			/* scope_id is only for v6 */
5708 			stc.scope_id = 0;
5709 			break;
5710 #endif
5711 #ifdef INET6
5712 		case AF_INET6:
5713 			sin6 = (struct sockaddr_in6 *)to;
5714 			memcpy(&stc.address, &sin6->sin6_addr,
5715 			    sizeof(struct in6_addr));
5716 			stc.addr_type = SCTP_IPV6_ADDRESS;
5717 			stc.scope_id = sin6->sin6_scope_id;
5718 			if (net->src_addr_selected == 0) {
5719 				/*
5720 				 * strange case here, the INIT should have
5721 				 * did the selection.
5722 				 */
5723 				net->ro._s_addr = sctp_source_address_selection(inp,
5724 				    stcb, (sctp_route_t *) & net->ro,
5725 				    net, 0, vrf_id);
5726 				if (net->ro._s_addr == NULL)
5727 					return;
5728 
5729 				net->src_addr_selected = 1;
5730 			}
5731 			memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5732 			    sizeof(struct in6_addr));
5733 			stc.laddr_type = SCTP_IPV6_ADDRESS;
5734 			break;
5735 #endif
5736 		}
5737 	}
5738 	/* Now lets put the SCTP header in place */
5739 	initack = mtod(m, struct sctp_init_ack_chunk *);
5740 	/* Save it off for quick ref */
5741 	stc.peers_vtag = init_chk->init.initiate_tag;
5742 	/* who are we */
5743 	memcpy(stc.identification, SCTP_VERSION_STRING,
5744 	    min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5745 	memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5746 	/* now the chunk header */
5747 	initack->ch.chunk_type = SCTP_INITIATION_ACK;
5748 	initack->ch.chunk_flags = 0;
5749 	/* fill in later from mbuf we build */
5750 	initack->ch.chunk_length = 0;
5751 	/* place in my tag */
5752 	if ((asoc != NULL) &&
5753 	    ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5754 	    (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5755 	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5756 		/* re-use the v-tags and init-seq here */
5757 		initack->init.initiate_tag = htonl(asoc->my_vtag);
5758 		initack->init.initial_tsn = htonl(asoc->init_seq_number);
5759 	} else {
5760 		uint32_t vtag, itsn;
5761 
5762 		if (hold_inp_lock) {
5763 			SCTP_INP_INCR_REF(inp);
5764 			SCTP_INP_RUNLOCK(inp);
5765 		}
5766 		if (asoc) {
5767 			atomic_add_int(&asoc->refcnt, 1);
5768 			SCTP_TCB_UNLOCK(stcb);
5769 	new_tag:
5770 			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5771 			if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5772 				/*
5773 				 * Got a duplicate vtag on some guy behind a
5774 				 * nat make sure we don't use it.
5775 				 */
5776 				goto new_tag;
5777 			}
5778 			initack->init.initiate_tag = htonl(vtag);
5779 			/* get a TSN to use too */
5780 			itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5781 			initack->init.initial_tsn = htonl(itsn);
5782 			SCTP_TCB_LOCK(stcb);
5783 			atomic_add_int(&asoc->refcnt, -1);
5784 		} else {
5785 			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5786 			initack->init.initiate_tag = htonl(vtag);
5787 			/* get a TSN to use too */
5788 			initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5789 		}
5790 		if (hold_inp_lock) {
5791 			SCTP_INP_RLOCK(inp);
5792 			SCTP_INP_DECR_REF(inp);
5793 		}
5794 	}
5795 	/* save away my tag to */
5796 	stc.my_vtag = initack->init.initiate_tag;
5797 
5798 	/* set up some of the credits. */
5799 	so = inp->sctp_socket;
5800 	if (so == NULL) {
5801 		/* memory problem */
5802 		sctp_m_freem(m);
5803 		return;
5804 	} else {
5805 		initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5806 	}
5807 	/* set what I want */
5808 	his_limit = ntohs(init_chk->init.num_inbound_streams);
5809 	/* choose what I want */
5810 	if (asoc != NULL) {
5811 		if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5812 			i_want = asoc->streamoutcnt;
5813 		} else {
5814 			i_want = inp->sctp_ep.pre_open_stream_count;
5815 		}
5816 	} else {
5817 		i_want = inp->sctp_ep.pre_open_stream_count;
5818 	}
5819 	if (his_limit < i_want) {
5820 		/* I Want more :< */
5821 		initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5822 	} else {
5823 		/* I can have what I want :> */
5824 		initack->init.num_outbound_streams = htons(i_want);
5825 	}
5826 	/* tell him his limt. */
5827 	initack->init.num_inbound_streams =
5828 	    htons(inp->sctp_ep.max_open_streams_intome);
5829 
5830 	/* adaptation layer indication parameter */
5831 	ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5832 	ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5833 	ali->ph.param_length = htons(sizeof(*ali));
5834 	ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5835 	SCTP_BUF_LEN(m) += sizeof(*ali);
5836 	ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5837 
5838 	/* ECN parameter */
5839 	if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5840 	    (inp->sctp_ecn_enable == 1)) {
5841 		ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5842 		ecn->ph.param_length = htons(sizeof(*ecn));
5843 		SCTP_BUF_LEN(m) += sizeof(*ecn);
5844 
5845 		prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5846 		    sizeof(*ecn));
5847 	} else {
5848 		prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5849 	}
5850 	/* And now tell the peer we do  pr-sctp */
5851 	prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5852 	prsctp->ph.param_length = htons(sizeof(*prsctp));
5853 	SCTP_BUF_LEN(m) += sizeof(*prsctp);
5854 	if (nat_friendly) {
5855 		/* Add NAT friendly parameter */
5856 		struct sctp_paramhdr *ph;
5857 
5858 		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5859 		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5860 		ph->param_length = htons(sizeof(struct sctp_paramhdr));
5861 		SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5862 	}
5863 	/* And now tell the peer we do all the extensions */
5864 	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5865 	pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5866 	num_ext = 0;
5867 	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5868 	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5869 	pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5870 	pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5871 	pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5872 	if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5873 		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5874 	if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5875 		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5876 	p_len = sizeof(*pr_supported) + num_ext;
5877 	pr_supported->ph.param_length = htons(p_len);
5878 	bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5879 	SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5880 
5881 	/* add authentication parameters */
5882 	if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5883 		struct sctp_auth_random *randp;
5884 		struct sctp_auth_hmac_algo *hmacs;
5885 		struct sctp_auth_chunk_list *chunks;
5886 		uint16_t random_len;
5887 
5888 		/* generate and add RANDOM parameter */
5889 		random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5890 		randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5891 		randp->ph.param_type = htons(SCTP_RANDOM);
5892 		p_len = sizeof(*randp) + random_len;
5893 		randp->ph.param_length = htons(p_len);
5894 		SCTP_READ_RANDOM(randp->random_data, random_len);
5895 		/* zero out any padding required */
5896 		bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5897 		SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5898 
5899 		/* add HMAC_ALGO parameter */
5900 		hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5901 		p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5902 		    (uint8_t *) hmacs->hmac_ids);
5903 		if (p_len > 0) {
5904 			p_len += sizeof(*hmacs);
5905 			hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5906 			hmacs->ph.param_length = htons(p_len);
5907 			/* zero out any padding required */
5908 			bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5909 			SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5910 		}
5911 		/* add CHUNKS parameter */
5912 		chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5913 		p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5914 		    chunks->chunk_types);
5915 		if (p_len > 0) {
5916 			p_len += sizeof(*chunks);
5917 			chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5918 			chunks->ph.param_length = htons(p_len);
5919 			/* zero out any padding required */
5920 			bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5921 			SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5922 		}
5923 	}
5924 	m_at = m;
5925 	/* now the addresses */
5926 	{
5927 		struct sctp_scoping scp;
5928 
5929 		/*
5930 		 * To optimize this we could put the scoping stuff into a
5931 		 * structure and remove the individual uint8's from the stc
5932 		 * structure. Then we could just sifa in the address within
5933 		 * the stc.. but for now this is a quick hack to get the
5934 		 * address stuff teased apart.
5935 		 */
5936 		scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5937 		scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5938 		scp.loopback_scope = stc.loopback_scope;
5939 		scp.ipv4_local_scope = stc.ipv4_scope;
5940 		scp.local_scope = stc.local_scope;
5941 		scp.site_scope = stc.site_scope;
5942 		m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to);
5943 	}
5944 
5945 	/* tack on the operational error if present */
5946 	if (op_err) {
5947 		struct mbuf *ol;
5948 		int llen;
5949 
5950 		llen = 0;
5951 		ol = op_err;
5952 
5953 		while (ol) {
5954 			llen += SCTP_BUF_LEN(ol);
5955 			ol = SCTP_BUF_NEXT(ol);
5956 		}
5957 		if (llen % 4) {
5958 			/* must add a pad to the param */
5959 			uint32_t cpthis = 0;
5960 			int padlen;
5961 
5962 			padlen = 4 - (llen % 4);
5963 			m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5964 		}
5965 		while (SCTP_BUF_NEXT(m_at) != NULL) {
5966 			m_at = SCTP_BUF_NEXT(m_at);
5967 		}
5968 		SCTP_BUF_NEXT(m_at) = op_err;
5969 		while (SCTP_BUF_NEXT(m_at) != NULL) {
5970 			m_at = SCTP_BUF_NEXT(m_at);
5971 		}
5972 	}
5973 	/* pre-calulate the size and update pkt header and chunk header */
5974 	p_len = 0;
5975 	for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5976 		p_len += SCTP_BUF_LEN(m_tmp);
5977 		if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5978 			/* m_tmp should now point to last one */
5979 			break;
5980 		}
5981 	}
5982 
5983 	/* Now we must build a cookie */
5984 	m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
5985 	if (m_cookie == NULL) {
5986 		/* memory problem */
5987 		sctp_m_freem(m);
5988 		return;
5989 	}
5990 	/* Now append the cookie to the end and update the space/size */
5991 	SCTP_BUF_NEXT(m_tmp) = m_cookie;
5992 
5993 	for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5994 		p_len += SCTP_BUF_LEN(m_tmp);
5995 		if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5996 			/* m_tmp should now point to last one */
5997 			mp_last = m_tmp;
5998 			break;
5999 		}
6000 	}
6001 	/*
6002 	 * Place in the size, but we don't include the last pad (if any) in
6003 	 * the INIT-ACK.
6004 	 */
6005 	initack->ch.chunk_length = htons(p_len);
6006 
6007 	/*
6008 	 * Time to sign the cookie, we don't sign over the cookie signature
6009 	 * though thus we set trailer.
6010 	 */
6011 	(void)sctp_hmac_m(SCTP_HMAC,
6012 	    (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6013 	    SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6014 	    (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6015 	/*
6016 	 * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6017 	 * here since the timer will drive a retranmission.
6018 	 */
6019 	padval = p_len % 4;
6020 	if ((padval) && (mp_last)) {
6021 		/* see my previous comments on mp_last */
6022 		if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
6023 			/* Houston we have a problem, no space */
6024 			sctp_m_freem(m);
6025 			return;
6026 		}
6027 	}
6028 	if (stc.loopback_scope) {
6029 		over_addr = &store1;
6030 	} else {
6031 		over_addr = NULL;
6032 	}
6033 
6034 	(void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6035 	    0, 0,
6036 	    inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6037 	    port, SCTP_SO_NOT_LOCKED, over_addr, init_pkt);
6038 	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6039 }
6040 
6041 
6042 static void
6043 sctp_prune_prsctp(struct sctp_tcb *stcb,
6044     struct sctp_association *asoc,
6045     struct sctp_sndrcvinfo *srcv,
6046     int dataout)
6047 {
6048 	int freed_spc = 0;
6049 	struct sctp_tmit_chunk *chk, *nchk;
6050 
6051 	SCTP_TCB_LOCK_ASSERT(stcb);
6052 	if ((asoc->peer_supports_prsctp) &&
6053 	    (asoc->sent_queue_cnt_removeable > 0)) {
6054 		TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6055 			/*
6056 			 * Look for chunks marked with the PR_SCTP flag AND
6057 			 * the buffer space flag. If the one being sent is
6058 			 * equal or greater priority then purge the old one
6059 			 * and free some space.
6060 			 */
6061 			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6062 				/*
6063 				 * This one is PR-SCTP AND buffer space
6064 				 * limited type
6065 				 */
6066 				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6067 					/*
6068 					 * Lower numbers equates to higher
6069 					 * priority so if the one we are
6070 					 * looking at has a larger or equal
6071 					 * priority we want to drop the data
6072 					 * and NOT retransmit it.
6073 					 */
6074 					if (chk->data) {
6075 						/*
6076 						 * We release the book_size
6077 						 * if the mbuf is here
6078 						 */
6079 						int ret_spc;
6080 						uint8_t sent;
6081 
6082 						if (chk->sent > SCTP_DATAGRAM_UNSENT)
6083 							sent = 1;
6084 						else
6085 							sent = 0;
6086 						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6087 						    sent,
6088 						    SCTP_SO_LOCKED);
6089 						freed_spc += ret_spc;
6090 						if (freed_spc >= dataout) {
6091 							return;
6092 						}
6093 					}	/* if chunk was present */
6094 				}	/* if of sufficent priority */
6095 			}	/* if chunk has enabled */
6096 		}		/* tailqforeach */
6097 
6098 		TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6099 			/* Here we must move to the sent queue and mark */
6100 			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6101 				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6102 					if (chk->data) {
6103 						/*
6104 						 * We release the book_size
6105 						 * if the mbuf is here
6106 						 */
6107 						int ret_spc;
6108 
6109 						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6110 						    0, SCTP_SO_LOCKED);
6111 
6112 						freed_spc += ret_spc;
6113 						if (freed_spc >= dataout) {
6114 							return;
6115 						}
6116 					}	/* end if chk->data */
6117 				}	/* end if right class */
6118 			}	/* end if chk pr-sctp */
6119 		}		/* tailqforeachsafe (chk) */
6120 	}			/* if enabled in asoc */
6121 }
6122 
6123 int
6124 sctp_get_frag_point(struct sctp_tcb *stcb,
6125     struct sctp_association *asoc)
6126 {
6127 	int siz, ovh;
6128 
6129 	/*
6130 	 * For endpoints that have both v6 and v4 addresses we must reserve
6131 	 * room for the ipv6 header, for those that are only dealing with V4
6132 	 * we use a larger frag point.
6133 	 */
6134 	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6135 		ovh = SCTP_MED_OVERHEAD;
6136 	} else {
6137 		ovh = SCTP_MED_V4_OVERHEAD;
6138 	}
6139 
6140 	if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6141 		siz = asoc->smallest_mtu - ovh;
6142 	else
6143 		siz = (stcb->asoc.sctp_frag_point - ovh);
6144 	/*
6145 	 * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6146 	 */
6147 	/* A data chunk MUST fit in a cluster */
6148 	/* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6149 	/* } */
6150 
6151 	/* adjust for an AUTH chunk if DATA requires auth */
6152 	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6153 		siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6154 
6155 	if (siz % 4) {
6156 		/* make it an even word boundary please */
6157 		siz -= (siz % 4);
6158 	}
6159 	return (siz);
6160 }
6161 
6162 static void
6163 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6164 {
6165 	sp->pr_sctp_on = 0;
6166 	/*
6167 	 * We assume that the user wants PR_SCTP_TTL if the user provides a
6168 	 * positive lifetime but does not specify any PR_SCTP policy. This
6169 	 * is a BAD assumption and causes problems at least with the
6170 	 * U-Vancovers MPI folks. I will change this to be no policy means
6171 	 * NO PR-SCTP.
6172 	 */
6173 	if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6174 		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6175 		sp->pr_sctp_on = 1;
6176 	} else {
6177 		return;
6178 	}
6179 	switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6180 	case CHUNK_FLAGS_PR_SCTP_BUF:
6181 		/*
6182 		 * Time to live is a priority stored in tv_sec when doing
6183 		 * the buffer drop thing.
6184 		 */
6185 		sp->ts.tv_sec = sp->timetolive;
6186 		sp->ts.tv_usec = 0;
6187 		break;
6188 	case CHUNK_FLAGS_PR_SCTP_TTL:
6189 		{
6190 			struct timeval tv;
6191 
6192 			(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6193 			tv.tv_sec = sp->timetolive / 1000;
6194 			tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6195 			/*
6196 			 * TODO sctp_constants.h needs alternative time
6197 			 * macros when _KERNEL is undefined.
6198 			 */
6199 			timevaladd(&sp->ts, &tv);
6200 		}
6201 		break;
6202 	case CHUNK_FLAGS_PR_SCTP_RTX:
6203 		/*
6204 		 * Time to live is a the number or retransmissions stored in
6205 		 * tv_sec.
6206 		 */
6207 		sp->ts.tv_sec = sp->timetolive;
6208 		sp->ts.tv_usec = 0;
6209 		break;
6210 	default:
6211 		SCTPDBG(SCTP_DEBUG_USRREQ1,
6212 		    "Unknown PR_SCTP policy %u.\n",
6213 		    PR_SCTP_POLICY(sp->sinfo_flags));
6214 		break;
6215 	}
6216 }
6217 
6218 static int
6219 sctp_msg_append(struct sctp_tcb *stcb,
6220     struct sctp_nets *net,
6221     struct mbuf *m,
6222     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6223 {
6224 	int error = 0;
6225 	struct mbuf *at;
6226 	struct sctp_stream_queue_pending *sp = NULL;
6227 	struct sctp_stream_out *strm;
6228 
6229 	/*
6230 	 * Given an mbuf chain, put it into the association send queue and
6231 	 * place it on the wheel
6232 	 */
6233 	if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6234 		/* Invalid stream number */
6235 		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6236 		error = EINVAL;
6237 		goto out_now;
6238 	}
6239 	if ((stcb->asoc.stream_locked) &&
6240 	    (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6241 		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6242 		error = EINVAL;
6243 		goto out_now;
6244 	}
6245 	strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6246 	/* Now can we send this? */
6247 	if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6248 	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6249 	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6250 	    (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6251 		/* got data while shutting down */
6252 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6253 		error = ECONNRESET;
6254 		goto out_now;
6255 	}
6256 	sctp_alloc_a_strmoq(stcb, sp);
6257 	if (sp == NULL) {
6258 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6259 		error = ENOMEM;
6260 		goto out_now;
6261 	}
6262 	sp->sinfo_flags = srcv->sinfo_flags;
6263 	sp->timetolive = srcv->sinfo_timetolive;
6264 	sp->ppid = srcv->sinfo_ppid;
6265 	sp->context = srcv->sinfo_context;
6266 	sp->strseq = 0;
6267 	if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6268 		sp->net = net;
6269 		atomic_add_int(&sp->net->ref_count, 1);
6270 	} else {
6271 		sp->net = NULL;
6272 	}
6273 	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6274 	sp->stream = srcv->sinfo_stream;
6275 	sp->msg_is_complete = 1;
6276 	sp->sender_all_done = 1;
6277 	sp->some_taken = 0;
6278 	sp->data = m;
6279 	sp->tail_mbuf = NULL;
6280 	sctp_set_prsctp_policy(sp);
6281 	/*
6282 	 * We could in theory (for sendall) sifa the length in, but we would
6283 	 * still have to hunt through the chain since we need to setup the
6284 	 * tail_mbuf
6285 	 */
6286 	sp->length = 0;
6287 	for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6288 		if (SCTP_BUF_NEXT(at) == NULL)
6289 			sp->tail_mbuf = at;
6290 		sp->length += SCTP_BUF_LEN(at);
6291 	}
6292 	if (srcv->sinfo_keynumber_valid) {
6293 		sp->auth_keyid = srcv->sinfo_keynumber;
6294 	} else {
6295 		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6296 	}
6297 	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6298 		sctp_auth_key_acquire(stcb, sp->auth_keyid);
6299 		sp->holds_key_ref = 1;
6300 	}
6301 	if (hold_stcb_lock == 0) {
6302 		SCTP_TCB_SEND_LOCK(stcb);
6303 	}
6304 	sctp_snd_sb_alloc(stcb, sp->length);
6305 	atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6306 	TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6307 	if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
6308 		sp->strseq = strm->next_sequence_sent;
6309 		strm->next_sequence_sent++;
6310 	}
6311 	stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6312 	m = NULL;
6313 	if (hold_stcb_lock == 0) {
6314 		SCTP_TCB_SEND_UNLOCK(stcb);
6315 	}
6316 out_now:
6317 	if (m) {
6318 		sctp_m_freem(m);
6319 	}
6320 	return (error);
6321 }
6322 
6323 
6324 static struct mbuf *
6325 sctp_copy_mbufchain(struct mbuf *clonechain,
6326     struct mbuf *outchain,
6327     struct mbuf **endofchain,
6328     int can_take_mbuf,
6329     int sizeofcpy,
6330     uint8_t copy_by_ref)
6331 {
6332 	struct mbuf *m;
6333 	struct mbuf *appendchain;
6334 	caddr_t cp;
6335 	int len;
6336 
6337 	if (endofchain == NULL) {
6338 		/* error */
6339 error_out:
6340 		if (outchain)
6341 			sctp_m_freem(outchain);
6342 		return (NULL);
6343 	}
6344 	if (can_take_mbuf) {
6345 		appendchain = clonechain;
6346 	} else {
6347 		if (!copy_by_ref &&
6348 		    (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6349 		    ) {
6350 			/* Its not in a cluster */
6351 			if (*endofchain == NULL) {
6352 				/* lets get a mbuf cluster */
6353 				if (outchain == NULL) {
6354 					/* This is the general case */
6355 			new_mbuf:
6356 					outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6357 					if (outchain == NULL) {
6358 						goto error_out;
6359 					}
6360 					SCTP_BUF_LEN(outchain) = 0;
6361 					*endofchain = outchain;
6362 					/* get the prepend space */
6363 					SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6364 				} else {
6365 					/*
6366 					 * We really should not get a NULL
6367 					 * in endofchain
6368 					 */
6369 					/* find end */
6370 					m = outchain;
6371 					while (m) {
6372 						if (SCTP_BUF_NEXT(m) == NULL) {
6373 							*endofchain = m;
6374 							break;
6375 						}
6376 						m = SCTP_BUF_NEXT(m);
6377 					}
6378 					/* sanity */
6379 					if (*endofchain == NULL) {
6380 						/*
6381 						 * huh, TSNH XXX maybe we
6382 						 * should panic
6383 						 */
6384 						sctp_m_freem(outchain);
6385 						goto new_mbuf;
6386 					}
6387 				}
6388 				/* get the new end of length */
6389 				len = M_TRAILINGSPACE(*endofchain);
6390 			} else {
6391 				/* how much is left at the end? */
6392 				len = M_TRAILINGSPACE(*endofchain);
6393 			}
6394 			/* Find the end of the data, for appending */
6395 			cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6396 
6397 			/* Now lets copy it out */
6398 			if (len >= sizeofcpy) {
6399 				/* It all fits, copy it in */
6400 				m_copydata(clonechain, 0, sizeofcpy, cp);
6401 				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6402 			} else {
6403 				/* fill up the end of the chain */
6404 				if (len > 0) {
6405 					m_copydata(clonechain, 0, len, cp);
6406 					SCTP_BUF_LEN((*endofchain)) += len;
6407 					/* now we need another one */
6408 					sizeofcpy -= len;
6409 				}
6410 				m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6411 				if (m == NULL) {
6412 					/* We failed */
6413 					goto error_out;
6414 				}
6415 				SCTP_BUF_NEXT((*endofchain)) = m;
6416 				*endofchain = m;
6417 				cp = mtod((*endofchain), caddr_t);
6418 				m_copydata(clonechain, len, sizeofcpy, cp);
6419 				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6420 			}
6421 			return (outchain);
6422 		} else {
6423 			/* copy the old fashion way */
6424 			appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6425 #ifdef SCTP_MBUF_LOGGING
6426 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6427 				struct mbuf *mat;
6428 
6429 				for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6430 					if (SCTP_BUF_IS_EXTENDED(mat)) {
6431 						sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6432 					}
6433 				}
6434 			}
6435 #endif
6436 		}
6437 	}
6438 	if (appendchain == NULL) {
6439 		/* error */
6440 		if (outchain)
6441 			sctp_m_freem(outchain);
6442 		return (NULL);
6443 	}
6444 	if (outchain) {
6445 		/* tack on to the end */
6446 		if (*endofchain != NULL) {
6447 			SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6448 		} else {
6449 			m = outchain;
6450 			while (m) {
6451 				if (SCTP_BUF_NEXT(m) == NULL) {
6452 					SCTP_BUF_NEXT(m) = appendchain;
6453 					break;
6454 				}
6455 				m = SCTP_BUF_NEXT(m);
6456 			}
6457 		}
6458 		/*
6459 		 * save off the end and update the end-chain postion
6460 		 */
6461 		m = appendchain;
6462 		while (m) {
6463 			if (SCTP_BUF_NEXT(m) == NULL) {
6464 				*endofchain = m;
6465 				break;
6466 			}
6467 			m = SCTP_BUF_NEXT(m);
6468 		}
6469 		return (outchain);
6470 	} else {
6471 		/* save off the end and update the end-chain postion */
6472 		m = appendchain;
6473 		while (m) {
6474 			if (SCTP_BUF_NEXT(m) == NULL) {
6475 				*endofchain = m;
6476 				break;
6477 			}
6478 			m = SCTP_BUF_NEXT(m);
6479 		}
6480 		return (appendchain);
6481 	}
6482 }
6483 
6484 int
6485 sctp_med_chunk_output(struct sctp_inpcb *inp,
6486     struct sctp_tcb *stcb,
6487     struct sctp_association *asoc,
6488     int *num_out,
6489     int *reason_code,
6490     int control_only, int from_where,
6491     struct timeval *now, int *now_filled, int frag_point, int so_locked
6492 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6493     SCTP_UNUSED
6494 #endif
6495 );
6496 
6497 static void
6498 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6499     uint32_t val SCTP_UNUSED)
6500 {
6501 	struct sctp_copy_all *ca;
6502 	struct mbuf *m;
6503 	int ret = 0;
6504 	int added_control = 0;
6505 	int un_sent, do_chunk_output = 1;
6506 	struct sctp_association *asoc;
6507 	struct sctp_nets *net;
6508 
6509 	ca = (struct sctp_copy_all *)ptr;
6510 	if (ca->m == NULL) {
6511 		return;
6512 	}
6513 	if (ca->inp != inp) {
6514 		/* TSNH */
6515 		return;
6516 	}
6517 	if ((ca->m) && ca->sndlen) {
6518 		m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6519 		if (m == NULL) {
6520 			/* can't copy so we are done */
6521 			ca->cnt_failed++;
6522 			return;
6523 		}
6524 #ifdef SCTP_MBUF_LOGGING
6525 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6526 			struct mbuf *mat;
6527 
6528 			for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6529 				if (SCTP_BUF_IS_EXTENDED(mat)) {
6530 					sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6531 				}
6532 			}
6533 		}
6534 #endif
6535 	} else {
6536 		m = NULL;
6537 	}
6538 	SCTP_TCB_LOCK_ASSERT(stcb);
6539 	if (stcb->asoc.alternate) {
6540 		net = stcb->asoc.alternate;
6541 	} else {
6542 		net = stcb->asoc.primary_destination;
6543 	}
6544 	if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6545 		/* Abort this assoc with m as the user defined reason */
6546 		if (m) {
6547 			struct sctp_paramhdr *ph;
6548 
6549 			SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6550 			if (m) {
6551 				ph = mtod(m, struct sctp_paramhdr *);
6552 				ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6553 				ph->param_length = htons(ca->sndlen);
6554 			}
6555 			/*
6556 			 * We add one here to keep the assoc from
6557 			 * dis-appearing on us.
6558 			 */
6559 			atomic_add_int(&stcb->asoc.refcnt, 1);
6560 			sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6561 			/*
6562 			 * sctp_abort_an_association calls sctp_free_asoc()
6563 			 * free association will NOT free it since we
6564 			 * incremented the refcnt .. we do this to prevent
6565 			 * it being freed and things getting tricky since we
6566 			 * could end up (from free_asoc) calling inpcb_free
6567 			 * which would get a recursive lock call to the
6568 			 * iterator lock.. But as a consequence of that the
6569 			 * stcb will return to us un-locked.. since
6570 			 * free_asoc returns with either no TCB or the TCB
6571 			 * unlocked, we must relock.. to unlock in the
6572 			 * iterator timer :-0
6573 			 */
6574 			SCTP_TCB_LOCK(stcb);
6575 			atomic_add_int(&stcb->asoc.refcnt, -1);
6576 			goto no_chunk_output;
6577 		}
6578 	} else {
6579 		if (m) {
6580 			ret = sctp_msg_append(stcb, net, m,
6581 			    &ca->sndrcv, 1);
6582 		}
6583 		asoc = &stcb->asoc;
6584 		if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6585 			/* shutdown this assoc */
6586 			int cnt;
6587 
6588 			cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6589 
6590 			if (TAILQ_EMPTY(&asoc->send_queue) &&
6591 			    TAILQ_EMPTY(&asoc->sent_queue) &&
6592 			    (cnt == 0)) {
6593 				if (asoc->locked_on_sending) {
6594 					goto abort_anyway;
6595 				}
6596 				/*
6597 				 * there is nothing queued to send, so I'm
6598 				 * done...
6599 				 */
6600 				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6601 				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6602 				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6603 					/*
6604 					 * only send SHUTDOWN the first time
6605 					 * through
6606 					 */
6607 					sctp_send_shutdown(stcb, net);
6608 					if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6609 						SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6610 					}
6611 					SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6612 					SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6613 					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6614 					    net);
6615 					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6616 					    asoc->primary_destination);
6617 					added_control = 1;
6618 					do_chunk_output = 0;
6619 				}
6620 			} else {
6621 				/*
6622 				 * we still got (or just got) data to send,
6623 				 * so set SHUTDOWN_PENDING
6624 				 */
6625 				/*
6626 				 * XXX sockets draft says that SCTP_EOF
6627 				 * should be sent with no data.  currently,
6628 				 * we will allow user data to be sent first
6629 				 * and move to SHUTDOWN-PENDING
6630 				 */
6631 				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6632 				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6633 				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6634 					if (asoc->locked_on_sending) {
6635 						/*
6636 						 * Locked to send out the
6637 						 * data
6638 						 */
6639 						struct sctp_stream_queue_pending *sp;
6640 
6641 						sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6642 						if (sp) {
6643 							if ((sp->length == 0) && (sp->msg_is_complete == 0))
6644 								asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6645 						}
6646 					}
6647 					asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6648 					if (TAILQ_EMPTY(&asoc->send_queue) &&
6649 					    TAILQ_EMPTY(&asoc->sent_queue) &&
6650 					    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6651 				abort_anyway:
6652 						atomic_add_int(&stcb->asoc.refcnt, 1);
6653 						sctp_abort_an_association(stcb->sctp_ep, stcb,
6654 						    NULL, SCTP_SO_NOT_LOCKED);
6655 						atomic_add_int(&stcb->asoc.refcnt, -1);
6656 						goto no_chunk_output;
6657 					}
6658 					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6659 					    asoc->primary_destination);
6660 				}
6661 			}
6662 
6663 		}
6664 	}
6665 	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6666 	    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6667 
6668 	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6669 	    (stcb->asoc.total_flight > 0) &&
6670 	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6671 	    ) {
6672 		do_chunk_output = 0;
6673 	}
6674 	if (do_chunk_output)
6675 		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6676 	else if (added_control) {
6677 		int num_out = 0, reason = 0, now_filled = 0;
6678 		struct timeval now;
6679 		int frag_point;
6680 
6681 		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6682 		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6683 		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6684 	}
6685 no_chunk_output:
6686 	if (ret) {
6687 		ca->cnt_failed++;
6688 	} else {
6689 		ca->cnt_sent++;
6690 	}
6691 }
6692 
6693 static void
6694 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6695 {
6696 	struct sctp_copy_all *ca;
6697 
6698 	ca = (struct sctp_copy_all *)ptr;
6699 	/*
6700 	 * Do a notify here? Kacheong suggests that the notify be done at
6701 	 * the send time.. so you would push up a notification if any send
6702 	 * failed. Don't know if this is feasable since the only failures we
6703 	 * have is "memory" related and if you cannot get an mbuf to send
6704 	 * the data you surely can't get an mbuf to send up to notify the
6705 	 * user you can't send the data :->
6706 	 */
6707 
6708 	/* now free everything */
6709 	sctp_m_freem(ca->m);
6710 	SCTP_FREE(ca, SCTP_M_COPYAL);
6711 }
6712 
6713 
6714 #define	MC_ALIGN(m, len) do {						\
6715 	SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1));	\
6716 } while (0)
6717 
6718 
6719 
6720 static struct mbuf *
6721 sctp_copy_out_all(struct uio *uio, int len)
6722 {
6723 	struct mbuf *ret, *at;
6724 	int left, willcpy, cancpy, error;
6725 
6726 	ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6727 	if (ret == NULL) {
6728 		/* TSNH */
6729 		return (NULL);
6730 	}
6731 	left = len;
6732 	SCTP_BUF_LEN(ret) = 0;
6733 	/* save space for the data chunk header */
6734 	cancpy = M_TRAILINGSPACE(ret);
6735 	willcpy = min(cancpy, left);
6736 	at = ret;
6737 	while (left > 0) {
6738 		/* Align data to the end */
6739 		error = uiomove(mtod(at, caddr_t), willcpy, uio);
6740 		if (error) {
6741 	err_out_now:
6742 			sctp_m_freem(at);
6743 			return (NULL);
6744 		}
6745 		SCTP_BUF_LEN(at) = willcpy;
6746 		SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6747 		left -= willcpy;
6748 		if (left > 0) {
6749 			SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6750 			if (SCTP_BUF_NEXT(at) == NULL) {
6751 				goto err_out_now;
6752 			}
6753 			at = SCTP_BUF_NEXT(at);
6754 			SCTP_BUF_LEN(at) = 0;
6755 			cancpy = M_TRAILINGSPACE(at);
6756 			willcpy = min(cancpy, left);
6757 		}
6758 	}
6759 	return (ret);
6760 }
6761 
6762 static int
6763 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6764     struct sctp_sndrcvinfo *srcv)
6765 {
6766 	int ret;
6767 	struct sctp_copy_all *ca;
6768 
6769 	SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6770 	    SCTP_M_COPYAL);
6771 	if (ca == NULL) {
6772 		sctp_m_freem(m);
6773 		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6774 		return (ENOMEM);
6775 	}
6776 	memset(ca, 0, sizeof(struct sctp_copy_all));
6777 
6778 	ca->inp = inp;
6779 	if (srcv) {
6780 		memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6781 	}
6782 	/*
6783 	 * take off the sendall flag, it would be bad if we failed to do
6784 	 * this :-0
6785 	 */
6786 	ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6787 	/* get length and mbuf chain */
6788 	if (uio) {
6789 		ca->sndlen = uio->uio_resid;
6790 		ca->m = sctp_copy_out_all(uio, ca->sndlen);
6791 		if (ca->m == NULL) {
6792 			SCTP_FREE(ca, SCTP_M_COPYAL);
6793 			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6794 			return (ENOMEM);
6795 		}
6796 	} else {
6797 		/* Gather the length of the send */
6798 		struct mbuf *mat;
6799 
6800 		mat = m;
6801 		ca->sndlen = 0;
6802 		while (m) {
6803 			ca->sndlen += SCTP_BUF_LEN(m);
6804 			m = SCTP_BUF_NEXT(m);
6805 		}
6806 		ca->m = mat;
6807 	}
6808 	ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6809 	    SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6810 	    SCTP_ASOC_ANY_STATE,
6811 	    (void *)ca, 0,
6812 	    sctp_sendall_completes, inp, 1);
6813 	if (ret) {
6814 		SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6815 		SCTP_FREE(ca, SCTP_M_COPYAL);
6816 		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6817 		return (EFAULT);
6818 	}
6819 	return (0);
6820 }
6821 
6822 
6823 void
6824 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6825 {
6826 	struct sctp_tmit_chunk *chk, *nchk;
6827 
6828 	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6829 		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6830 			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6831 			if (chk->data) {
6832 				sctp_m_freem(chk->data);
6833 				chk->data = NULL;
6834 			}
6835 			asoc->ctrl_queue_cnt--;
6836 			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6837 		}
6838 	}
6839 }
6840 
6841 void
6842 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6843 {
6844 	struct sctp_association *asoc;
6845 	struct sctp_tmit_chunk *chk, *nchk;
6846 	struct sctp_asconf_chunk *acp;
6847 
6848 	asoc = &stcb->asoc;
6849 	TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6850 		/* find SCTP_ASCONF chunk in queue */
6851 		if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6852 			if (chk->data) {
6853 				acp = mtod(chk->data, struct sctp_asconf_chunk *);
6854 				if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6855 					/* Not Acked yet */
6856 					break;
6857 				}
6858 			}
6859 			TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6860 			if (chk->data) {
6861 				sctp_m_freem(chk->data);
6862 				chk->data = NULL;
6863 			}
6864 			asoc->ctrl_queue_cnt--;
6865 			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6866 		}
6867 	}
6868 }
6869 
6870 
6871 static void
6872 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6873     struct sctp_association *asoc,
6874     struct sctp_tmit_chunk **data_list,
6875     int bundle_at,
6876     struct sctp_nets *net)
6877 {
6878 	int i;
6879 	struct sctp_tmit_chunk *tp1;
6880 
6881 	for (i = 0; i < bundle_at; i++) {
6882 		/* off of the send queue */
6883 		TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6884 		asoc->send_queue_cnt--;
6885 		if (i > 0) {
6886 			/*
6887 			 * Any chunk NOT 0 you zap the time chunk 0 gets
6888 			 * zapped or set based on if a RTO measurment is
6889 			 * needed.
6890 			 */
6891 			data_list[i]->do_rtt = 0;
6892 		}
6893 		/* record time */
6894 		data_list[i]->sent_rcv_time = net->last_sent_time;
6895 		data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6896 		data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6897 		if (data_list[i]->whoTo == NULL) {
6898 			data_list[i]->whoTo = net;
6899 			atomic_add_int(&net->ref_count, 1);
6900 		}
6901 		/* on to the sent queue */
6902 		tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6903 		if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6904 			struct sctp_tmit_chunk *tpp;
6905 
6906 			/* need to move back */
6907 	back_up_more:
6908 			tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6909 			if (tpp == NULL) {
6910 				TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6911 				goto all_done;
6912 			}
6913 			tp1 = tpp;
6914 			if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6915 				goto back_up_more;
6916 			}
6917 			TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6918 		} else {
6919 			TAILQ_INSERT_TAIL(&asoc->sent_queue,
6920 			    data_list[i],
6921 			    sctp_next);
6922 		}
6923 all_done:
6924 		/* This does not lower until the cum-ack passes it */
6925 		asoc->sent_queue_cnt++;
6926 		if ((asoc->peers_rwnd <= 0) &&
6927 		    (asoc->total_flight == 0) &&
6928 		    (bundle_at == 1)) {
6929 			/* Mark the chunk as being a window probe */
6930 			SCTP_STAT_INCR(sctps_windowprobed);
6931 		}
6932 #ifdef SCTP_AUDITING_ENABLED
6933 		sctp_audit_log(0xC2, 3);
6934 #endif
6935 		data_list[i]->sent = SCTP_DATAGRAM_SENT;
6936 		data_list[i]->snd_count = 1;
6937 		data_list[i]->rec.data.chunk_was_revoked = 0;
6938 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6939 			sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6940 			    data_list[i]->whoTo->flight_size,
6941 			    data_list[i]->book_size,
6942 			    (uintptr_t) data_list[i]->whoTo,
6943 			    data_list[i]->rec.data.TSN_seq);
6944 		}
6945 		sctp_flight_size_increase(data_list[i]);
6946 		sctp_total_flight_increase(stcb, data_list[i]);
6947 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6948 			sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6949 			    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6950 		}
6951 		asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6952 		    (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6953 		if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6954 			/* SWS sender side engages */
6955 			asoc->peers_rwnd = 0;
6956 		}
6957 	}
6958 	if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6959 		(*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6960 	}
6961 }
6962 
6963 static void
6964 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6965 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6966     SCTP_UNUSED
6967 #endif
6968 )
6969 {
6970 	struct sctp_tmit_chunk *chk, *nchk;
6971 
6972 	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6973 		if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6974 		    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
6975 		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6976 		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6977 		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6978 		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6979 		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6980 		    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6981 		    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6982 		    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6983 		    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6984 		    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6985 			/* Stray chunks must be cleaned up */
6986 	clean_up_anyway:
6987 			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6988 			if (chk->data) {
6989 				sctp_m_freem(chk->data);
6990 				chk->data = NULL;
6991 			}
6992 			asoc->ctrl_queue_cnt--;
6993 			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6994 				asoc->fwd_tsn_cnt--;
6995 			sctp_free_a_chunk(stcb, chk, so_locked);
6996 		} else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6997 			/* special handling, we must look into the param */
6998 			if (chk != asoc->str_reset) {
6999 				goto clean_up_anyway;
7000 			}
7001 		}
7002 	}
7003 }
7004 
7005 
7006 static int
7007 sctp_can_we_split_this(struct sctp_tcb *stcb,
7008     uint32_t length,
7009     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7010 {
7011 	/*
7012 	 * Make a decision on if I should split a msg into multiple parts.
7013 	 * This is only asked of incomplete messages.
7014 	 */
7015 	if (eeor_on) {
7016 		/*
7017 		 * If we are doing EEOR we need to always send it if its the
7018 		 * entire thing, since it might be all the guy is putting in
7019 		 * the hopper.
7020 		 */
7021 		if (goal_mtu >= length) {
7022 			/*-
7023 			 * If we have data outstanding,
7024 			 * we get another chance when the sack
7025 			 * arrives to transmit - wait for more data
7026 			 */
7027 			if (stcb->asoc.total_flight == 0) {
7028 				/*
7029 				 * If nothing is in flight, we zero the
7030 				 * packet counter.
7031 				 */
7032 				return (length);
7033 			}
7034 			return (0);
7035 
7036 		} else {
7037 			/* You can fill the rest */
7038 			return (goal_mtu);
7039 		}
7040 	}
7041 	/*-
7042 	 * For those strange folk that make the send buffer
7043 	 * smaller than our fragmentation point, we can't
7044 	 * get a full msg in so we have to allow splitting.
7045 	 */
7046 	if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7047 		return (length);
7048 	}
7049 	if ((length <= goal_mtu) ||
7050 	    ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7051 		/* Sub-optimial residual don't split in non-eeor mode. */
7052 		return (0);
7053 	}
7054 	/*
7055 	 * If we reach here length is larger than the goal_mtu. Do we wish
7056 	 * to split it for the sake of packet putting together?
7057 	 */
7058 	if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7059 		/* Its ok to split it */
7060 		return (min(goal_mtu, frag_point));
7061 	}
7062 	/* Nope, can't split */
7063 	return (0);
7064 
7065 }
7066 
7067 static uint32_t
7068 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7069     struct sctp_stream_out *strq,
7070     uint32_t goal_mtu,
7071     uint32_t frag_point,
7072     int *locked,
7073     int *giveup,
7074     int eeor_mode,
7075     int *bail,
7076     int so_locked
7077 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7078     SCTP_UNUSED
7079 #endif
7080 )
7081 {
7082 	/* Move from the stream to the send_queue keeping track of the total */
7083 	struct sctp_association *asoc;
7084 	struct sctp_stream_queue_pending *sp;
7085 	struct sctp_tmit_chunk *chk;
7086 	struct sctp_data_chunk *dchkh;
7087 	uint32_t to_move, length;
7088 	uint8_t rcv_flags = 0;
7089 	uint8_t some_taken;
7090 	uint8_t send_lock_up = 0;
7091 
7092 	SCTP_TCB_LOCK_ASSERT(stcb);
7093 	asoc = &stcb->asoc;
7094 one_more_time:
7095 	/* sa_ignore FREED_MEMORY */
7096 	sp = TAILQ_FIRST(&strq->outqueue);
7097 	if (sp == NULL) {
7098 		*locked = 0;
7099 		if (send_lock_up == 0) {
7100 			SCTP_TCB_SEND_LOCK(stcb);
7101 			send_lock_up = 1;
7102 		}
7103 		sp = TAILQ_FIRST(&strq->outqueue);
7104 		if (sp) {
7105 			goto one_more_time;
7106 		}
7107 		if (strq->last_msg_incomplete) {
7108 			SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7109 			    strq->stream_no,
7110 			    strq->last_msg_incomplete);
7111 			strq->last_msg_incomplete = 0;
7112 		}
7113 		to_move = 0;
7114 		if (send_lock_up) {
7115 			SCTP_TCB_SEND_UNLOCK(stcb);
7116 			send_lock_up = 0;
7117 		}
7118 		goto out_of;
7119 	}
7120 	if ((sp->msg_is_complete) && (sp->length == 0)) {
7121 		if (sp->sender_all_done) {
7122 			/*
7123 			 * We are doing differed cleanup. Last time through
7124 			 * when we took all the data the sender_all_done was
7125 			 * not set.
7126 			 */
7127 			if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7128 				SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7129 				SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7130 				    sp->sender_all_done,
7131 				    sp->length,
7132 				    sp->msg_is_complete,
7133 				    sp->put_last_out,
7134 				    send_lock_up);
7135 			}
7136 			if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7137 				SCTP_TCB_SEND_LOCK(stcb);
7138 				send_lock_up = 1;
7139 			}
7140 			atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7141 			TAILQ_REMOVE(&strq->outqueue, sp, next);
7142 			stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7143 			if (sp->net) {
7144 				sctp_free_remote_addr(sp->net);
7145 				sp->net = NULL;
7146 			}
7147 			if (sp->data) {
7148 				sctp_m_freem(sp->data);
7149 				sp->data = NULL;
7150 			}
7151 			sctp_free_a_strmoq(stcb, sp, so_locked);
7152 			/* we can't be locked to it */
7153 			*locked = 0;
7154 			stcb->asoc.locked_on_sending = NULL;
7155 			if (send_lock_up) {
7156 				SCTP_TCB_SEND_UNLOCK(stcb);
7157 				send_lock_up = 0;
7158 			}
7159 			/* back to get the next msg */
7160 			goto one_more_time;
7161 		} else {
7162 			/*
7163 			 * sender just finished this but still holds a
7164 			 * reference
7165 			 */
7166 			*locked = 1;
7167 			*giveup = 1;
7168 			to_move = 0;
7169 			goto out_of;
7170 		}
7171 	} else {
7172 		/* is there some to get */
7173 		if (sp->length == 0) {
7174 			/* no */
7175 			*locked = 1;
7176 			*giveup = 1;
7177 			to_move = 0;
7178 			goto out_of;
7179 		} else if (sp->discard_rest) {
7180 			if (send_lock_up == 0) {
7181 				SCTP_TCB_SEND_LOCK(stcb);
7182 				send_lock_up = 1;
7183 			}
7184 			/* Whack down the size */
7185 			atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7186 			if ((stcb->sctp_socket != NULL) && \
7187 			    ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7188 			    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7189 				atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7190 			}
7191 			if (sp->data) {
7192 				sctp_m_freem(sp->data);
7193 				sp->data = NULL;
7194 				sp->tail_mbuf = NULL;
7195 			}
7196 			sp->length = 0;
7197 			sp->some_taken = 1;
7198 			*locked = 1;
7199 			*giveup = 1;
7200 			to_move = 0;
7201 			goto out_of;
7202 		}
7203 	}
7204 	some_taken = sp->some_taken;
7205 	if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7206 		sp->msg_is_complete = 1;
7207 	}
7208 re_look:
7209 	length = sp->length;
7210 	if (sp->msg_is_complete) {
7211 		/* The message is complete */
7212 		to_move = min(length, frag_point);
7213 		if (to_move == length) {
7214 			/* All of it fits in the MTU */
7215 			if (sp->some_taken) {
7216 				rcv_flags |= SCTP_DATA_LAST_FRAG;
7217 				sp->put_last_out = 1;
7218 			} else {
7219 				rcv_flags |= SCTP_DATA_NOT_FRAG;
7220 				sp->put_last_out = 1;
7221 			}
7222 		} else {
7223 			/* Not all of it fits, we fragment */
7224 			if (sp->some_taken == 0) {
7225 				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7226 			}
7227 			sp->some_taken = 1;
7228 		}
7229 	} else {
7230 		to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7231 		if (to_move) {
7232 			/*-
7233 			 * We use a snapshot of length in case it
7234 			 * is expanding during the compare.
7235 			 */
7236 			uint32_t llen;
7237 
7238 			llen = length;
7239 			if (to_move >= llen) {
7240 				to_move = llen;
7241 				if (send_lock_up == 0) {
7242 					/*-
7243 					 * We are taking all of an incomplete msg
7244 					 * thus we need a send lock.
7245 					 */
7246 					SCTP_TCB_SEND_LOCK(stcb);
7247 					send_lock_up = 1;
7248 					if (sp->msg_is_complete) {
7249 						/*
7250 						 * the sender finished the
7251 						 * msg
7252 						 */
7253 						goto re_look;
7254 					}
7255 				}
7256 			}
7257 			if (sp->some_taken == 0) {
7258 				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7259 				sp->some_taken = 1;
7260 			}
7261 		} else {
7262 			/* Nothing to take. */
7263 			if (sp->some_taken) {
7264 				*locked = 1;
7265 			}
7266 			*giveup = 1;
7267 			to_move = 0;
7268 			goto out_of;
7269 		}
7270 	}
7271 
7272 	/* If we reach here, we can copy out a chunk */
7273 	sctp_alloc_a_chunk(stcb, chk);
7274 	if (chk == NULL) {
7275 		/* No chunk memory */
7276 		*giveup = 1;
7277 		to_move = 0;
7278 		goto out_of;
7279 	}
7280 	/*
7281 	 * Setup for unordered if needed by looking at the user sent info
7282 	 * flags.
7283 	 */
7284 	if (sp->sinfo_flags & SCTP_UNORDERED) {
7285 		rcv_flags |= SCTP_DATA_UNORDERED;
7286 	}
7287 	if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7288 	    ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7289 		rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7290 	}
7291 	/* clear out the chunk before setting up */
7292 	memset(chk, 0, sizeof(*chk));
7293 	chk->rec.data.rcv_flags = rcv_flags;
7294 
7295 	if (to_move >= length) {
7296 		/* we think we can steal the whole thing */
7297 		if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7298 			SCTP_TCB_SEND_LOCK(stcb);
7299 			send_lock_up = 1;
7300 		}
7301 		if (to_move < sp->length) {
7302 			/* bail, it changed */
7303 			goto dont_do_it;
7304 		}
7305 		chk->data = sp->data;
7306 		chk->last_mbuf = sp->tail_mbuf;
7307 		/* register the stealing */
7308 		sp->data = sp->tail_mbuf = NULL;
7309 	} else {
7310 		struct mbuf *m;
7311 
7312 dont_do_it:
7313 		chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7314 		chk->last_mbuf = NULL;
7315 		if (chk->data == NULL) {
7316 			sp->some_taken = some_taken;
7317 			sctp_free_a_chunk(stcb, chk, so_locked);
7318 			*bail = 1;
7319 			to_move = 0;
7320 			goto out_of;
7321 		}
7322 #ifdef SCTP_MBUF_LOGGING
7323 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7324 			struct mbuf *mat;
7325 
7326 			for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7327 				if (SCTP_BUF_IS_EXTENDED(mat)) {
7328 					sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7329 				}
7330 			}
7331 		}
7332 #endif
7333 		/* Pull off the data */
7334 		m_adj(sp->data, to_move);
7335 		/* Now lets work our way down and compact it */
7336 		m = sp->data;
7337 		while (m && (SCTP_BUF_LEN(m) == 0)) {
7338 			sp->data = SCTP_BUF_NEXT(m);
7339 			SCTP_BUF_NEXT(m) = NULL;
7340 			if (sp->tail_mbuf == m) {
7341 				/*-
7342 				 * Freeing tail? TSNH since
7343 				 * we supposedly were taking less
7344 				 * than the sp->length.
7345 				 */
7346 #ifdef INVARIANTS
7347 				panic("Huh, freing tail? - TSNH");
7348 #else
7349 				SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7350 				sp->tail_mbuf = sp->data = NULL;
7351 				sp->length = 0;
7352 #endif
7353 
7354 			}
7355 			sctp_m_free(m);
7356 			m = sp->data;
7357 		}
7358 	}
7359 	if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7360 		chk->copy_by_ref = 1;
7361 	} else {
7362 		chk->copy_by_ref = 0;
7363 	}
7364 	/*
7365 	 * get last_mbuf and counts of mb useage This is ugly but hopefully
7366 	 * its only one mbuf.
7367 	 */
7368 	if (chk->last_mbuf == NULL) {
7369 		chk->last_mbuf = chk->data;
7370 		while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7371 			chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7372 		}
7373 	}
7374 	if (to_move > length) {
7375 		/*- This should not happen either
7376 		 * since we always lower to_move to the size
7377 		 * of sp->length if its larger.
7378 		 */
7379 #ifdef INVARIANTS
7380 		panic("Huh, how can to_move be larger?");
7381 #else
7382 		SCTP_PRINTF("Huh, how can to_move be larger?\n");
7383 		sp->length = 0;
7384 #endif
7385 	} else {
7386 		atomic_subtract_int(&sp->length, to_move);
7387 	}
7388 	if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7389 		/* Not enough room for a chunk header, get some */
7390 		struct mbuf *m;
7391 
7392 		m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7393 		if (m == NULL) {
7394 			/*
7395 			 * we're in trouble here. _PREPEND below will free
7396 			 * all the data if there is no leading space, so we
7397 			 * must put the data back and restore.
7398 			 */
7399 			if (send_lock_up == 0) {
7400 				SCTP_TCB_SEND_LOCK(stcb);
7401 				send_lock_up = 1;
7402 			}
7403 			if (chk->data == NULL) {
7404 				/* unsteal the data */
7405 				sp->data = chk->data;
7406 				sp->tail_mbuf = chk->last_mbuf;
7407 			} else {
7408 				struct mbuf *m_tmp;
7409 
7410 				/* reassemble the data */
7411 				m_tmp = sp->data;
7412 				sp->data = chk->data;
7413 				SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7414 			}
7415 			sp->some_taken = some_taken;
7416 			atomic_add_int(&sp->length, to_move);
7417 			chk->data = NULL;
7418 			*bail = 1;
7419 			sctp_free_a_chunk(stcb, chk, so_locked);
7420 			to_move = 0;
7421 			goto out_of;
7422 		} else {
7423 			SCTP_BUF_LEN(m) = 0;
7424 			SCTP_BUF_NEXT(m) = chk->data;
7425 			chk->data = m;
7426 			M_ALIGN(chk->data, 4);
7427 		}
7428 	}
7429 	SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7430 	if (chk->data == NULL) {
7431 		/* HELP, TSNH since we assured it would not above? */
7432 #ifdef INVARIANTS
7433 		panic("prepend failes HELP?");
7434 #else
7435 		SCTP_PRINTF("prepend fails HELP?\n");
7436 		sctp_free_a_chunk(stcb, chk, so_locked);
7437 #endif
7438 		*bail = 1;
7439 		to_move = 0;
7440 		goto out_of;
7441 	}
7442 	sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7443 	chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7444 	chk->book_size_scale = 0;
7445 	chk->sent = SCTP_DATAGRAM_UNSENT;
7446 
7447 	chk->flags = 0;
7448 	chk->asoc = &stcb->asoc;
7449 	chk->pad_inplace = 0;
7450 	chk->no_fr_allowed = 0;
7451 	chk->rec.data.stream_seq = sp->strseq;
7452 	chk->rec.data.stream_number = sp->stream;
7453 	chk->rec.data.payloadtype = sp->ppid;
7454 	chk->rec.data.context = sp->context;
7455 	chk->rec.data.doing_fast_retransmit = 0;
7456 
7457 	chk->rec.data.timetodrop = sp->ts;
7458 	chk->flags = sp->act_flags;
7459 
7460 	if (sp->net) {
7461 		chk->whoTo = sp->net;
7462 		atomic_add_int(&chk->whoTo->ref_count, 1);
7463 	} else
7464 		chk->whoTo = NULL;
7465 
7466 	if (sp->holds_key_ref) {
7467 		chk->auth_keyid = sp->auth_keyid;
7468 		sctp_auth_key_acquire(stcb, chk->auth_keyid);
7469 		chk->holds_key_ref = 1;
7470 	}
7471 	chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7472 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7473 		sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7474 		    (uintptr_t) stcb, sp->length,
7475 		    (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7476 		    chk->rec.data.TSN_seq);
7477 	}
7478 	dchkh = mtod(chk->data, struct sctp_data_chunk *);
7479 	/*
7480 	 * Put the rest of the things in place now. Size was done earlier in
7481 	 * previous loop prior to padding.
7482 	 */
7483 
7484 #ifdef SCTP_ASOCLOG_OF_TSNS
7485 	SCTP_TCB_LOCK_ASSERT(stcb);
7486 	if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7487 		asoc->tsn_out_at = 0;
7488 		asoc->tsn_out_wrapped = 1;
7489 	}
7490 	asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7491 	asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7492 	asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7493 	asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7494 	asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7495 	asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7496 	asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7497 	asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7498 	asoc->tsn_out_at++;
7499 #endif
7500 
7501 	dchkh->ch.chunk_type = SCTP_DATA;
7502 	dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7503 	dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7504 	dchkh->dp.stream_id = htons(strq->stream_no);
7505 	dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7506 	dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7507 	dchkh->ch.chunk_length = htons(chk->send_size);
7508 	/* Now advance the chk->send_size by the actual pad needed. */
7509 	if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7510 		/* need a pad */
7511 		struct mbuf *lm;
7512 		int pads;
7513 
7514 		pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7515 		if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7516 			chk->pad_inplace = 1;
7517 		}
7518 		if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7519 			/* pad added an mbuf */
7520 			chk->last_mbuf = lm;
7521 		}
7522 		chk->send_size += pads;
7523 	}
7524 	/* We only re-set the policy if it is on */
7525 	if (sp->pr_sctp_on) {
7526 		sctp_set_prsctp_policy(sp);
7527 		asoc->pr_sctp_cnt++;
7528 		chk->pr_sctp_on = 1;
7529 	} else {
7530 		chk->pr_sctp_on = 0;
7531 	}
7532 	if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7533 		/* All done pull and kill the message */
7534 		atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7535 		if (sp->put_last_out == 0) {
7536 			SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7537 			SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7538 			    sp->sender_all_done,
7539 			    sp->length,
7540 			    sp->msg_is_complete,
7541 			    sp->put_last_out,
7542 			    send_lock_up);
7543 		}
7544 		if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7545 			SCTP_TCB_SEND_LOCK(stcb);
7546 			send_lock_up = 1;
7547 		}
7548 		TAILQ_REMOVE(&strq->outqueue, sp, next);
7549 		stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7550 		if (sp->net) {
7551 			sctp_free_remote_addr(sp->net);
7552 			sp->net = NULL;
7553 		}
7554 		if (sp->data) {
7555 			sctp_m_freem(sp->data);
7556 			sp->data = NULL;
7557 		}
7558 		sctp_free_a_strmoq(stcb, sp, so_locked);
7559 
7560 		/* we can't be locked to it */
7561 		*locked = 0;
7562 		stcb->asoc.locked_on_sending = NULL;
7563 	} else {
7564 		/* more to go, we are locked */
7565 		*locked = 1;
7566 	}
7567 	asoc->chunks_on_out_queue++;
7568 	TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7569 	asoc->send_queue_cnt++;
7570 out_of:
7571 	if (send_lock_up) {
7572 		SCTP_TCB_SEND_UNLOCK(stcb);
7573 	}
7574 	return (to_move);
7575 }
7576 
7577 
7578 static void
7579 sctp_fill_outqueue(struct sctp_tcb *stcb,
7580     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7581 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7582     SCTP_UNUSED
7583 #endif
7584 )
7585 {
7586 	struct sctp_association *asoc;
7587 	struct sctp_stream_out *strq;
7588 	int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7589 	int locked, giveup;
7590 
7591 	SCTP_TCB_LOCK_ASSERT(stcb);
7592 	asoc = &stcb->asoc;
7593 	switch (net->ro._l_addr.sa.sa_family) {
7594 #ifdef INET
7595 	case AF_INET:
7596 		goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7597 		break;
7598 #endif
7599 #ifdef INET6
7600 	case AF_INET6:
7601 		goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7602 		break;
7603 #endif
7604 	default:
7605 		/* TSNH */
7606 		goal_mtu = net->mtu;
7607 		break;
7608 	}
7609 	/* Need an allowance for the data chunk header too */
7610 	goal_mtu -= sizeof(struct sctp_data_chunk);
7611 
7612 	/* must make even word boundary */
7613 	goal_mtu &= 0xfffffffc;
7614 	if (asoc->locked_on_sending) {
7615 		/* We are stuck on one stream until the message completes. */
7616 		strq = asoc->locked_on_sending;
7617 		locked = 1;
7618 	} else {
7619 		strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7620 		locked = 0;
7621 	}
7622 	while ((goal_mtu > 0) && strq) {
7623 		giveup = 0;
7624 		bail = 0;
7625 		moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7626 		    &giveup, eeor_mode, &bail, so_locked);
7627 		if (moved_how_much)
7628 			stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7629 
7630 		if (locked) {
7631 			asoc->locked_on_sending = strq;
7632 			if ((moved_how_much == 0) || (giveup) || bail)
7633 				/* no more to move for now */
7634 				break;
7635 		} else {
7636 			asoc->locked_on_sending = NULL;
7637 			if ((giveup) || bail) {
7638 				break;
7639 			}
7640 			strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7641 			if (strq == NULL) {
7642 				break;
7643 			}
7644 		}
7645 		total_moved += moved_how_much;
7646 		goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7647 		goal_mtu &= 0xfffffffc;
7648 	}
7649 	if (bail)
7650 		*quit_now = 1;
7651 
7652 	stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7653 
7654 	if (total_moved == 0) {
7655 		if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7656 		    (net == stcb->asoc.primary_destination)) {
7657 			/* ran dry for primary network net */
7658 			SCTP_STAT_INCR(sctps_primary_randry);
7659 		} else if (stcb->asoc.sctp_cmt_on_off > 0) {
7660 			/* ran dry with CMT on */
7661 			SCTP_STAT_INCR(sctps_cmt_randry);
7662 		}
7663 	}
7664 }
7665 
7666 void
7667 sctp_fix_ecn_echo(struct sctp_association *asoc)
7668 {
7669 	struct sctp_tmit_chunk *chk;
7670 
7671 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7672 		if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7673 			chk->sent = SCTP_DATAGRAM_UNSENT;
7674 		}
7675 	}
7676 }
7677 
7678 void
7679 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7680 {
7681 	struct sctp_association *asoc;
7682 	struct sctp_tmit_chunk *chk;
7683 	struct sctp_stream_queue_pending *sp;
7684 	unsigned int i;
7685 
7686 	if (net == NULL) {
7687 		return;
7688 	}
7689 	asoc = &stcb->asoc;
7690 	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7691 		TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7692 			if (sp->net == net) {
7693 				sctp_free_remote_addr(sp->net);
7694 				sp->net = NULL;
7695 			}
7696 		}
7697 	}
7698 	TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7699 		if (chk->whoTo == net) {
7700 			sctp_free_remote_addr(chk->whoTo);
7701 			chk->whoTo = NULL;
7702 		}
7703 	}
7704 }
7705 
7706 int
7707 sctp_med_chunk_output(struct sctp_inpcb *inp,
7708     struct sctp_tcb *stcb,
7709     struct sctp_association *asoc,
7710     int *num_out,
7711     int *reason_code,
7712     int control_only, int from_where,
7713     struct timeval *now, int *now_filled, int frag_point, int so_locked
7714 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7715     SCTP_UNUSED
7716 #endif
7717 )
7718 {
7719 	/*
7720 	 * Ok this is the generic chunk service queue. we must do the
7721 	 * following: - Service the stream queue that is next, moving any
7722 	 * message (note I must get a complete message i.e. FIRST/MIDDLE and
7723 	 * LAST to the out queue in one pass) and assigning TSN's - Check to
7724 	 * see if the cwnd/rwnd allows any output, if so we go ahead and
7725 	 * fomulate and send the low level chunks. Making sure to combine
7726 	 * any control in the control chunk queue also.
7727 	 */
7728 	struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7729 	struct mbuf *outchain, *endoutchain;
7730 	struct sctp_tmit_chunk *chk, *nchk;
7731 
7732 	/* temp arrays for unlinking */
7733 	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7734 	int no_fragmentflg, error;
7735 	unsigned int max_rwnd_per_dest, max_send_per_dest;
7736 	int one_chunk, hbflag, skip_data_for_this_net;
7737 	int asconf, cookie, no_out_cnt;
7738 	int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7739 	unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7740 	int tsns_sent = 0;
7741 	uint32_t auth_offset = 0;
7742 	struct sctp_auth_chunk *auth = NULL;
7743 	uint16_t auth_keyid;
7744 	int override_ok = 1;
7745 	int skip_fill_up = 0;
7746 	int data_auth_reqd = 0;
7747 
7748 	/*
7749 	 * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7750 	 * destination.
7751 	 */
7752 	int quit_now = 0;
7753 
7754 	*num_out = 0;
7755 	auth_keyid = stcb->asoc.authinfo.active_keyid;
7756 
7757 	if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7758 	    (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7759 	    (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7760 		eeor_mode = 1;
7761 	} else {
7762 		eeor_mode = 0;
7763 	}
7764 	ctl_cnt = no_out_cnt = asconf = cookie = 0;
7765 	/*
7766 	 * First lets prime the pump. For each destination, if there is room
7767 	 * in the flight size, attempt to pull an MTU's worth out of the
7768 	 * stream queues into the general send_queue
7769 	 */
7770 #ifdef SCTP_AUDITING_ENABLED
7771 	sctp_audit_log(0xC2, 2);
7772 #endif
7773 	SCTP_TCB_LOCK_ASSERT(stcb);
7774 	hbflag = 0;
7775 	if ((control_only) || (asoc->stream_reset_outstanding))
7776 		no_data_chunks = 1;
7777 	else
7778 		no_data_chunks = 0;
7779 
7780 	/* Nothing to possible to send? */
7781 	if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7782 	    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7783 	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7784 	    TAILQ_EMPTY(&asoc->send_queue) &&
7785 	    stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7786 nothing_to_send:
7787 		*reason_code = 9;
7788 		return (0);
7789 	}
7790 	if (asoc->peers_rwnd == 0) {
7791 		/* No room in peers rwnd */
7792 		*reason_code = 1;
7793 		if (asoc->total_flight > 0) {
7794 			/* we are allowed one chunk in flight */
7795 			no_data_chunks = 1;
7796 		}
7797 	}
7798 	if (stcb->asoc.ecn_echo_cnt_onq) {
7799 		/* Record where a sack goes, if any */
7800 		if (no_data_chunks &&
7801 		    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7802 			/* Nothing but ECNe to send - we don't do that */
7803 			goto nothing_to_send;
7804 		}
7805 		TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7806 			if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7807 			    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7808 				sack_goes_to = chk->whoTo;
7809 				break;
7810 			}
7811 		}
7812 	}
7813 	max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7814 	if (stcb->sctp_socket)
7815 		max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7816 	else
7817 		max_send_per_dest = 0;
7818 	if (no_data_chunks == 0) {
7819 		/* How many non-directed chunks are there? */
7820 		TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7821 			if (chk->whoTo == NULL) {
7822 				/*
7823 				 * We already have non-directed chunks on
7824 				 * the queue, no need to do a fill-up.
7825 				 */
7826 				skip_fill_up = 1;
7827 				break;
7828 			}
7829 		}
7830 
7831 	}
7832 	if ((no_data_chunks == 0) &&
7833 	    (skip_fill_up == 0) &&
7834 	    (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7835 		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7836 			/*
7837 			 * This for loop we are in takes in each net, if
7838 			 * its's got space in cwnd and has data sent to it
7839 			 * (when CMT is off) then it calls
7840 			 * sctp_fill_outqueue for the net. This gets data on
7841 			 * the send queue for that network.
7842 			 *
7843 			 * In sctp_fill_outqueue TSN's are assigned and data is
7844 			 * copied out of the stream buffers. Note mostly
7845 			 * copy by reference (we hope).
7846 			 */
7847 			net->window_probe = 0;
7848 			if ((net != stcb->asoc.alternate) &&
7849 			    ((net->dest_state & SCTP_ADDR_PF) ||
7850 			    (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7851 			    (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7852 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7853 					sctp_log_cwnd(stcb, net, 1,
7854 					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7855 				}
7856 				continue;
7857 			}
7858 			if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7859 			    (net->flight_size == 0)) {
7860 				(*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7861 			}
7862 			if (net->flight_size >= net->cwnd) {
7863 				/* skip this network, no room - can't fill */
7864 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7865 					sctp_log_cwnd(stcb, net, 3,
7866 					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7867 				}
7868 				continue;
7869 			}
7870 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7871 				sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7872 			}
7873 			sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7874 			if (quit_now) {
7875 				/* memory alloc failure */
7876 				no_data_chunks = 1;
7877 				break;
7878 			}
7879 		}
7880 	}
7881 	/* now service each destination and send out what we can for it */
7882 	/* Nothing to send? */
7883 	if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7884 	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7885 	    TAILQ_EMPTY(&asoc->send_queue)) {
7886 		*reason_code = 8;
7887 		return (0);
7888 	}
7889 	if (asoc->sctp_cmt_on_off > 0) {
7890 		/* get the last start point */
7891 		start_at = asoc->last_net_cmt_send_started;
7892 		if (start_at == NULL) {
7893 			/* null so to beginning */
7894 			start_at = TAILQ_FIRST(&asoc->nets);
7895 		} else {
7896 			start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7897 			if (start_at == NULL) {
7898 				start_at = TAILQ_FIRST(&asoc->nets);
7899 			}
7900 		}
7901 		asoc->last_net_cmt_send_started = start_at;
7902 	} else {
7903 		start_at = TAILQ_FIRST(&asoc->nets);
7904 	}
7905 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7906 		if (chk->whoTo == NULL) {
7907 			if (asoc->alternate) {
7908 				chk->whoTo = asoc->alternate;
7909 			} else {
7910 				chk->whoTo = asoc->primary_destination;
7911 			}
7912 			atomic_add_int(&chk->whoTo->ref_count, 1);
7913 		}
7914 	}
7915 	old_start_at = NULL;
7916 again_one_more_time:
7917 	for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7918 		/* how much can we send? */
7919 		/* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7920 		if (old_start_at && (old_start_at == net)) {
7921 			/* through list ocmpletely. */
7922 			break;
7923 		}
7924 		tsns_sent = 0xa;
7925 		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7926 		    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7927 		    (net->flight_size >= net->cwnd)) {
7928 			/*
7929 			 * Nothing on control or asconf and flight is full,
7930 			 * we can skip even in the CMT case.
7931 			 */
7932 			continue;
7933 		}
7934 		bundle_at = 0;
7935 		endoutchain = outchain = NULL;
7936 		no_fragmentflg = 1;
7937 		one_chunk = 0;
7938 		if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7939 			skip_data_for_this_net = 1;
7940 		} else {
7941 			skip_data_for_this_net = 0;
7942 		}
7943 		if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7944 			/*
7945 			 * if we have a route and an ifp check to see if we
7946 			 * have room to send to this guy
7947 			 */
7948 			struct ifnet *ifp;
7949 
7950 			ifp = net->ro.ro_rt->rt_ifp;
7951 			if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7952 				SCTP_STAT_INCR(sctps_ifnomemqueued);
7953 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7954 					sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7955 				}
7956 				continue;
7957 			}
7958 		}
7959 		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7960 #ifdef INET
7961 		case AF_INET:
7962 			mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7963 			break;
7964 #endif
7965 #ifdef INET6
7966 		case AF_INET6:
7967 			mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7968 			break;
7969 #endif
7970 		default:
7971 			/* TSNH */
7972 			mtu = net->mtu;
7973 			break;
7974 		}
7975 		mx_mtu = mtu;
7976 		to_out = 0;
7977 		if (mtu > asoc->peers_rwnd) {
7978 			if (asoc->total_flight > 0) {
7979 				/* We have a packet in flight somewhere */
7980 				r_mtu = asoc->peers_rwnd;
7981 			} else {
7982 				/* We are always allowed to send one MTU out */
7983 				one_chunk = 1;
7984 				r_mtu = mtu;
7985 			}
7986 		} else {
7987 			r_mtu = mtu;
7988 		}
7989 		/************************/
7990 		/* ASCONF transmission */
7991 		/************************/
7992 		/* Now first lets go through the asconf queue */
7993 		TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
7994 			if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7995 				continue;
7996 			}
7997 			if (chk->whoTo == NULL) {
7998 				if (asoc->alternate == NULL) {
7999 					if (asoc->primary_destination != net) {
8000 						break;
8001 					}
8002 				} else {
8003 					if (asoc->alternate != net) {
8004 						break;
8005 					}
8006 				}
8007 			} else {
8008 				if (chk->whoTo != net) {
8009 					break;
8010 				}
8011 			}
8012 			if (chk->data == NULL) {
8013 				break;
8014 			}
8015 			if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8016 			    chk->sent != SCTP_DATAGRAM_RESEND) {
8017 				break;
8018 			}
8019 			/*
8020 			 * if no AUTH is yet included and this chunk
8021 			 * requires it, make sure to account for it.  We
8022 			 * don't apply the size until the AUTH chunk is
8023 			 * actually added below in case there is no room for
8024 			 * this chunk. NOTE: we overload the use of "omtu"
8025 			 * here
8026 			 */
8027 			if ((auth == NULL) &&
8028 			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8029 			    stcb->asoc.peer_auth_chunks)) {
8030 				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8031 			} else
8032 				omtu = 0;
8033 			/* Here we do NOT factor the r_mtu */
8034 			if ((chk->send_size < (int)(mtu - omtu)) ||
8035 			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8036 				/*
8037 				 * We probably should glom the mbuf chain
8038 				 * from the chk->data for control but the
8039 				 * problem is it becomes yet one more level
8040 				 * of tracking to do if for some reason
8041 				 * output fails. Then I have got to
8042 				 * reconstruct the merged control chain.. el
8043 				 * yucko.. for now we take the easy way and
8044 				 * do the copy
8045 				 */
8046 				/*
8047 				 * Add an AUTH chunk, if chunk requires it
8048 				 * save the offset into the chain for AUTH
8049 				 */
8050 				if ((auth == NULL) &&
8051 				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8052 				    stcb->asoc.peer_auth_chunks))) {
8053 					outchain = sctp_add_auth_chunk(outchain,
8054 					    &endoutchain,
8055 					    &auth,
8056 					    &auth_offset,
8057 					    stcb,
8058 					    chk->rec.chunk_id.id);
8059 					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8060 				}
8061 				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8062 				    (int)chk->rec.chunk_id.can_take_data,
8063 				    chk->send_size, chk->copy_by_ref);
8064 				if (outchain == NULL) {
8065 					*reason_code = 8;
8066 					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8067 					return (ENOMEM);
8068 				}
8069 				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8070 				/* update our MTU size */
8071 				if (mtu > (chk->send_size + omtu))
8072 					mtu -= (chk->send_size + omtu);
8073 				else
8074 					mtu = 0;
8075 				to_out += (chk->send_size + omtu);
8076 				/* Do clear IP_DF ? */
8077 				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8078 					no_fragmentflg = 0;
8079 				}
8080 				if (chk->rec.chunk_id.can_take_data)
8081 					chk->data = NULL;
8082 				/*
8083 				 * set hb flag since we can use these for
8084 				 * RTO
8085 				 */
8086 				hbflag = 1;
8087 				asconf = 1;
8088 				/*
8089 				 * should sysctl this: don't bundle data
8090 				 * with ASCONF since it requires AUTH
8091 				 */
8092 				no_data_chunks = 1;
8093 				chk->sent = SCTP_DATAGRAM_SENT;
8094 				if (chk->whoTo == NULL) {
8095 					chk->whoTo = net;
8096 					atomic_add_int(&net->ref_count, 1);
8097 				}
8098 				chk->snd_count++;
8099 				if (mtu == 0) {
8100 					/*
8101 					 * Ok we are out of room but we can
8102 					 * output without effecting the
8103 					 * flight size since this little guy
8104 					 * is a control only packet.
8105 					 */
8106 					sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8107 					/*
8108 					 * do NOT clear the asconf flag as
8109 					 * it is used to do appropriate
8110 					 * source address selection.
8111 					 */
8112 					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8113 					    (struct sockaddr *)&net->ro._l_addr,
8114 					    outchain, auth_offset, auth,
8115 					    stcb->asoc.authinfo.active_keyid,
8116 					    no_fragmentflg, 0, asconf,
8117 					    inp->sctp_lport, stcb->rport,
8118 					    htonl(stcb->asoc.peer_vtag),
8119 					    net->port, so_locked, NULL, NULL))) {
8120 						if (error == ENOBUFS) {
8121 							asoc->ifp_had_enobuf = 1;
8122 							SCTP_STAT_INCR(sctps_lowlevelerr);
8123 						}
8124 						if (from_where == 0) {
8125 							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8126 						}
8127 						if (*now_filled == 0) {
8128 							(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8129 							*now_filled = 1;
8130 							*now = net->last_sent_time;
8131 						} else {
8132 							net->last_sent_time = *now;
8133 						}
8134 						hbflag = 0;
8135 						/* error, could not output */
8136 						if (error == EHOSTUNREACH) {
8137 							/*
8138 							 * Destination went
8139 							 * unreachable
8140 							 * during this send
8141 							 */
8142 							sctp_move_chunks_from_net(stcb, net);
8143 						}
8144 						*reason_code = 7;
8145 						continue;
8146 					} else
8147 						asoc->ifp_had_enobuf = 0;
8148 					if (*now_filled == 0) {
8149 						(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8150 						*now_filled = 1;
8151 						*now = net->last_sent_time;
8152 					} else {
8153 						net->last_sent_time = *now;
8154 					}
8155 					hbflag = 0;
8156 					/*
8157 					 * increase the number we sent, if a
8158 					 * cookie is sent we don't tell them
8159 					 * any was sent out.
8160 					 */
8161 					outchain = endoutchain = NULL;
8162 					auth = NULL;
8163 					auth_offset = 0;
8164 					if (!no_out_cnt)
8165 						*num_out += ctl_cnt;
8166 					/* recalc a clean slate and setup */
8167 					switch (net->ro._l_addr.sa.sa_family) {
8168 #ifdef INET
8169 					case AF_INET:
8170 						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8171 						break;
8172 #endif
8173 #ifdef INET6
8174 					case AF_INET6:
8175 						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8176 						break;
8177 #endif
8178 					default:
8179 						/* TSNH */
8180 						mtu = net->mtu;
8181 						break;
8182 					}
8183 					to_out = 0;
8184 					no_fragmentflg = 1;
8185 				}
8186 			}
8187 		}
8188 		/************************/
8189 		/* Control transmission */
8190 		/************************/
8191 		/* Now first lets go through the control queue */
8192 		TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8193 			if ((sack_goes_to) &&
8194 			    (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8195 			    (chk->whoTo != sack_goes_to)) {
8196 				/*
8197 				 * if we have a sack in queue, and we are
8198 				 * looking at an ecn echo that is NOT queued
8199 				 * to where the sack is going..
8200 				 */
8201 				if (chk->whoTo == net) {
8202 					/*
8203 					 * Don't transmit it to where its
8204 					 * going (current net)
8205 					 */
8206 					continue;
8207 				} else if (sack_goes_to == net) {
8208 					/*
8209 					 * But do transmit it to this
8210 					 * address
8211 					 */
8212 					goto skip_net_check;
8213 				}
8214 			}
8215 			if (chk->whoTo == NULL) {
8216 				if (asoc->alternate == NULL) {
8217 					if (asoc->primary_destination != net) {
8218 						continue;
8219 					}
8220 				} else {
8221 					if (asoc->alternate != net) {
8222 						continue;
8223 					}
8224 				}
8225 			} else {
8226 				if (chk->whoTo != net) {
8227 					continue;
8228 				}
8229 			}
8230 	skip_net_check:
8231 			if (chk->data == NULL) {
8232 				continue;
8233 			}
8234 			if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8235 				/*
8236 				 * It must be unsent. Cookies and ASCONF's
8237 				 * hang around but there timers will force
8238 				 * when marked for resend.
8239 				 */
8240 				continue;
8241 			}
8242 			/*
8243 			 * if no AUTH is yet included and this chunk
8244 			 * requires it, make sure to account for it.  We
8245 			 * don't apply the size until the AUTH chunk is
8246 			 * actually added below in case there is no room for
8247 			 * this chunk. NOTE: we overload the use of "omtu"
8248 			 * here
8249 			 */
8250 			if ((auth == NULL) &&
8251 			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8252 			    stcb->asoc.peer_auth_chunks)) {
8253 				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8254 			} else
8255 				omtu = 0;
8256 			/* Here we do NOT factor the r_mtu */
8257 			if ((chk->send_size <= (int)(mtu - omtu)) ||
8258 			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8259 				/*
8260 				 * We probably should glom the mbuf chain
8261 				 * from the chk->data for control but the
8262 				 * problem is it becomes yet one more level
8263 				 * of tracking to do if for some reason
8264 				 * output fails. Then I have got to
8265 				 * reconstruct the merged control chain.. el
8266 				 * yucko.. for now we take the easy way and
8267 				 * do the copy
8268 				 */
8269 				/*
8270 				 * Add an AUTH chunk, if chunk requires it
8271 				 * save the offset into the chain for AUTH
8272 				 */
8273 				if ((auth == NULL) &&
8274 				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8275 				    stcb->asoc.peer_auth_chunks))) {
8276 					outchain = sctp_add_auth_chunk(outchain,
8277 					    &endoutchain,
8278 					    &auth,
8279 					    &auth_offset,
8280 					    stcb,
8281 					    chk->rec.chunk_id.id);
8282 					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8283 				}
8284 				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8285 				    (int)chk->rec.chunk_id.can_take_data,
8286 				    chk->send_size, chk->copy_by_ref);
8287 				if (outchain == NULL) {
8288 					*reason_code = 8;
8289 					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8290 					return (ENOMEM);
8291 				}
8292 				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8293 				/* update our MTU size */
8294 				if (mtu > (chk->send_size + omtu))
8295 					mtu -= (chk->send_size + omtu);
8296 				else
8297 					mtu = 0;
8298 				to_out += (chk->send_size + omtu);
8299 				/* Do clear IP_DF ? */
8300 				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8301 					no_fragmentflg = 0;
8302 				}
8303 				if (chk->rec.chunk_id.can_take_data)
8304 					chk->data = NULL;
8305 				/* Mark things to be removed, if needed */
8306 				if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8307 				    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
8308 				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8309 				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8310 				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8311 				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8312 				    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8313 				    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8314 				    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8315 				    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8316 				    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8317 					if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8318 						hbflag = 1;
8319 					}
8320 					/* remove these chunks at the end */
8321 					if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8322 					    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8323 						/* turn off the timer */
8324 						if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8325 							sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8326 							    inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8327 						}
8328 					}
8329 					ctl_cnt++;
8330 				} else {
8331 					/*
8332 					 * Other chunks, since they have
8333 					 * timers running (i.e. COOKIE) we
8334 					 * just "trust" that it gets sent or
8335 					 * retransmitted.
8336 					 */
8337 					ctl_cnt++;
8338 					if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8339 						cookie = 1;
8340 						no_out_cnt = 1;
8341 					} else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8342 						/*
8343 						 * Increment ecne send count
8344 						 * here this means we may be
8345 						 * over-zealous in our
8346 						 * counting if the send
8347 						 * fails, but its the best
8348 						 * place to do it (we used
8349 						 * to do it in the queue of
8350 						 * the chunk, but that did
8351 						 * not tell how many times
8352 						 * it was sent.
8353 						 */
8354 						SCTP_STAT_INCR(sctps_sendecne);
8355 					}
8356 					chk->sent = SCTP_DATAGRAM_SENT;
8357 					if (chk->whoTo == NULL) {
8358 						chk->whoTo = net;
8359 						atomic_add_int(&net->ref_count, 1);
8360 					}
8361 					chk->snd_count++;
8362 				}
8363 				if (mtu == 0) {
8364 					/*
8365 					 * Ok we are out of room but we can
8366 					 * output without effecting the
8367 					 * flight size since this little guy
8368 					 * is a control only packet.
8369 					 */
8370 					if (asconf) {
8371 						sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8372 						/*
8373 						 * do NOT clear the asconf
8374 						 * flag as it is used to do
8375 						 * appropriate source
8376 						 * address selection.
8377 						 */
8378 					}
8379 					if (cookie) {
8380 						sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8381 						cookie = 0;
8382 					}
8383 					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8384 					    (struct sockaddr *)&net->ro._l_addr,
8385 					    outchain,
8386 					    auth_offset, auth,
8387 					    stcb->asoc.authinfo.active_keyid,
8388 					    no_fragmentflg, 0, asconf,
8389 					    inp->sctp_lport, stcb->rport,
8390 					    htonl(stcb->asoc.peer_vtag),
8391 					    net->port, so_locked, NULL, NULL))) {
8392 						if (error == ENOBUFS) {
8393 							asoc->ifp_had_enobuf = 1;
8394 							SCTP_STAT_INCR(sctps_lowlevelerr);
8395 						}
8396 						if (from_where == 0) {
8397 							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8398 						}
8399 						/* error, could not output */
8400 						if (hbflag) {
8401 							if (*now_filled == 0) {
8402 								(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8403 								*now_filled = 1;
8404 								*now = net->last_sent_time;
8405 							} else {
8406 								net->last_sent_time = *now;
8407 							}
8408 							hbflag = 0;
8409 						}
8410 						if (error == EHOSTUNREACH) {
8411 							/*
8412 							 * Destination went
8413 							 * unreachable
8414 							 * during this send
8415 							 */
8416 							sctp_move_chunks_from_net(stcb, net);
8417 						}
8418 						*reason_code = 7;
8419 						continue;
8420 					} else
8421 						asoc->ifp_had_enobuf = 0;
8422 					/* Only HB or ASCONF advances time */
8423 					if (hbflag) {
8424 						if (*now_filled == 0) {
8425 							(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8426 							*now_filled = 1;
8427 							*now = net->last_sent_time;
8428 						} else {
8429 							net->last_sent_time = *now;
8430 						}
8431 						hbflag = 0;
8432 					}
8433 					/*
8434 					 * increase the number we sent, if a
8435 					 * cookie is sent we don't tell them
8436 					 * any was sent out.
8437 					 */
8438 					outchain = endoutchain = NULL;
8439 					auth = NULL;
8440 					auth_offset = 0;
8441 					if (!no_out_cnt)
8442 						*num_out += ctl_cnt;
8443 					/* recalc a clean slate and setup */
8444 					switch (net->ro._l_addr.sa.sa_family) {
8445 #ifdef INET
8446 					case AF_INET:
8447 						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8448 						break;
8449 #endif
8450 #ifdef INET6
8451 					case AF_INET6:
8452 						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8453 						break;
8454 #endif
8455 					default:
8456 						/* TSNH */
8457 						mtu = net->mtu;
8458 						break;
8459 					}
8460 					to_out = 0;
8461 					no_fragmentflg = 1;
8462 				}
8463 			}
8464 		}
8465 		/* JRI: if dest is in PF state, do not send data to it */
8466 		if ((asoc->sctp_cmt_on_off > 0) &&
8467 		    (net != stcb->asoc.alternate) &&
8468 		    (net->dest_state & SCTP_ADDR_PF)) {
8469 			goto no_data_fill;
8470 		}
8471 		if (net->flight_size >= net->cwnd) {
8472 			goto no_data_fill;
8473 		}
8474 		if ((asoc->sctp_cmt_on_off > 0) &&
8475 		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8476 		    (net->flight_size > max_rwnd_per_dest)) {
8477 			goto no_data_fill;
8478 		}
8479 		/*
8480 		 * We need a specific accounting for the usage of the send
8481 		 * buffer. We also need to check the number of messages per
8482 		 * net. For now, this is better than nothing and it disabled
8483 		 * by default...
8484 		 */
8485 		if ((asoc->sctp_cmt_on_off > 0) &&
8486 		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8487 		    (max_send_per_dest > 0) &&
8488 		    (net->flight_size > max_send_per_dest)) {
8489 			goto no_data_fill;
8490 		}
8491 		/*********************/
8492 		/* Data transmission */
8493 		/*********************/
8494 		/*
8495 		 * if AUTH for DATA is required and no AUTH has been added
8496 		 * yet, account for this in the mtu now... if no data can be
8497 		 * bundled, this adjustment won't matter anyways since the
8498 		 * packet will be going out...
8499 		 */
8500 		data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8501 		    stcb->asoc.peer_auth_chunks);
8502 		if (data_auth_reqd && (auth == NULL)) {
8503 			mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8504 		}
8505 		/* now lets add any data within the MTU constraints */
8506 		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8507 		case AF_INET:
8508 			if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8509 				omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8510 			else
8511 				omtu = 0;
8512 			break;
8513 #ifdef INET6
8514 		case AF_INET6:
8515 			if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8516 				omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8517 			else
8518 				omtu = 0;
8519 			break;
8520 #endif
8521 		default:
8522 			/* TSNH */
8523 			omtu = 0;
8524 			break;
8525 		}
8526 		if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8527 		    (skip_data_for_this_net == 0)) ||
8528 		    (cookie)) {
8529 			TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8530 				if (no_data_chunks) {
8531 					/* let only control go out */
8532 					*reason_code = 1;
8533 					break;
8534 				}
8535 				if (net->flight_size >= net->cwnd) {
8536 					/* skip this net, no room for data */
8537 					*reason_code = 2;
8538 					break;
8539 				}
8540 				if ((chk->whoTo != NULL) &&
8541 				    (chk->whoTo != net)) {
8542 					/* Don't send the chunk on this net */
8543 					continue;
8544 				}
8545 				if (asoc->sctp_cmt_on_off == 0) {
8546 					if ((asoc->alternate) &&
8547 					    (asoc->alternate != net) &&
8548 					    (chk->whoTo == NULL)) {
8549 						continue;
8550 					} else if ((net != asoc->primary_destination) &&
8551 						    (asoc->alternate == NULL) &&
8552 					    (chk->whoTo == NULL)) {
8553 						continue;
8554 					}
8555 				}
8556 				if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8557 					/*-
8558 					 * strange, we have a chunk that is
8559 					 * to big for its destination and
8560 					 * yet no fragment ok flag.
8561 					 * Something went wrong when the
8562 					 * PMTU changed...we did not mark
8563 					 * this chunk for some reason?? I
8564 					 * will fix it here by letting IP
8565 					 * fragment it for now and printing
8566 					 * a warning. This really should not
8567 					 * happen ...
8568 					 */
8569 					SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8570 					    chk->send_size, mtu);
8571 					chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8572 				}
8573 				if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8574 				    ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8575 					struct sctp_data_chunk *dchkh;
8576 
8577 					dchkh = mtod(chk->data, struct sctp_data_chunk *);
8578 					dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8579 				}
8580 				if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8581 				    ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8582 					/* ok we will add this one */
8583 
8584 					/*
8585 					 * Add an AUTH chunk, if chunk
8586 					 * requires it, save the offset into
8587 					 * the chain for AUTH
8588 					 */
8589 					if (data_auth_reqd) {
8590 						if (auth == NULL) {
8591 							outchain = sctp_add_auth_chunk(outchain,
8592 							    &endoutchain,
8593 							    &auth,
8594 							    &auth_offset,
8595 							    stcb,
8596 							    SCTP_DATA);
8597 							auth_keyid = chk->auth_keyid;
8598 							override_ok = 0;
8599 							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8600 						} else if (override_ok) {
8601 							/*
8602 							 * use this data's
8603 							 * keyid
8604 							 */
8605 							auth_keyid = chk->auth_keyid;
8606 							override_ok = 0;
8607 						} else if (auth_keyid != chk->auth_keyid) {
8608 							/*
8609 							 * different keyid,
8610 							 * so done bundling
8611 							 */
8612 							break;
8613 						}
8614 					}
8615 					outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8616 					    chk->send_size, chk->copy_by_ref);
8617 					if (outchain == NULL) {
8618 						SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8619 						if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8620 							sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8621 						}
8622 						*reason_code = 3;
8623 						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8624 						return (ENOMEM);
8625 					}
8626 					/* upate our MTU size */
8627 					/* Do clear IP_DF ? */
8628 					if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8629 						no_fragmentflg = 0;
8630 					}
8631 					/* unsigned subtraction of mtu */
8632 					if (mtu > chk->send_size)
8633 						mtu -= chk->send_size;
8634 					else
8635 						mtu = 0;
8636 					/* unsigned subtraction of r_mtu */
8637 					if (r_mtu > chk->send_size)
8638 						r_mtu -= chk->send_size;
8639 					else
8640 						r_mtu = 0;
8641 
8642 					to_out += chk->send_size;
8643 					if ((to_out > mx_mtu) && no_fragmentflg) {
8644 #ifdef INVARIANTS
8645 						panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8646 #else
8647 						SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8648 						    mx_mtu, to_out);
8649 #endif
8650 					}
8651 					chk->window_probe = 0;
8652 					data_list[bundle_at++] = chk;
8653 					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8654 						break;
8655 					}
8656 					if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8657 						if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8658 							SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8659 						} else {
8660 							SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8661 						}
8662 						if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8663 						    ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8664 							/*
8665 							 * Count number of
8666 							 * user msg's that
8667 							 * were fragmented
8668 							 * we do this by
8669 							 * counting when we
8670 							 * see a LAST
8671 							 * fragment only.
8672 							 */
8673 							SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8674 					}
8675 					if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8676 						if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8677 							data_list[0]->window_probe = 1;
8678 							net->window_probe = 1;
8679 						}
8680 						break;
8681 					}
8682 				} else {
8683 					/*
8684 					 * Must be sent in order of the
8685 					 * TSN's (on a network)
8686 					 */
8687 					break;
8688 				}
8689 			}	/* for (chunk gather loop for this net) */
8690 		}		/* if asoc.state OPEN */
8691 no_data_fill:
8692 		/* Is there something to send for this destination? */
8693 		if (outchain) {
8694 			/* We may need to start a control timer or two */
8695 			if (asconf) {
8696 				sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8697 				    stcb, net);
8698 				/*
8699 				 * do NOT clear the asconf flag as it is
8700 				 * used to do appropriate source address
8701 				 * selection.
8702 				 */
8703 			}
8704 			if (cookie) {
8705 				sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8706 				cookie = 0;
8707 			}
8708 			/* must start a send timer if data is being sent */
8709 			if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8710 				/*
8711 				 * no timer running on this destination
8712 				 * restart it.
8713 				 */
8714 				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8715 			}
8716 			/* Now send it, if there is anything to send :> */
8717 			if ((error = sctp_lowlevel_chunk_output(inp,
8718 			    stcb,
8719 			    net,
8720 			    (struct sockaddr *)&net->ro._l_addr,
8721 			    outchain,
8722 			    auth_offset,
8723 			    auth,
8724 			    auth_keyid,
8725 			    no_fragmentflg,
8726 			    bundle_at,
8727 			    asconf,
8728 			    inp->sctp_lport, stcb->rport,
8729 			    htonl(stcb->asoc.peer_vtag),
8730 			    net->port, so_locked, NULL, NULL))) {
8731 				/* error, we could not output */
8732 				if (error == ENOBUFS) {
8733 					SCTP_STAT_INCR(sctps_lowlevelerr);
8734 					asoc->ifp_had_enobuf = 1;
8735 				}
8736 				if (from_where == 0) {
8737 					SCTP_STAT_INCR(sctps_lowlevelerrusr);
8738 				}
8739 				SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8740 				if (hbflag) {
8741 					if (*now_filled == 0) {
8742 						(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8743 						*now_filled = 1;
8744 						*now = net->last_sent_time;
8745 					} else {
8746 						net->last_sent_time = *now;
8747 					}
8748 					hbflag = 0;
8749 				}
8750 				if (error == EHOSTUNREACH) {
8751 					/*
8752 					 * Destination went unreachable
8753 					 * during this send
8754 					 */
8755 					sctp_move_chunks_from_net(stcb, net);
8756 				}
8757 				*reason_code = 6;
8758 				/*-
8759 				 * I add this line to be paranoid. As far as
8760 				 * I can tell the continue, takes us back to
8761 				 * the top of the for, but just to make sure
8762 				 * I will reset these again here.
8763 				 */
8764 				ctl_cnt = bundle_at = 0;
8765 				continue;	/* This takes us back to the
8766 						 * for() for the nets. */
8767 			} else {
8768 				asoc->ifp_had_enobuf = 0;
8769 			}
8770 			endoutchain = NULL;
8771 			auth = NULL;
8772 			auth_offset = 0;
8773 			if (bundle_at || hbflag) {
8774 				/* For data/asconf and hb set time */
8775 				if (*now_filled == 0) {
8776 					(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8777 					*now_filled = 1;
8778 					*now = net->last_sent_time;
8779 				} else {
8780 					net->last_sent_time = *now;
8781 				}
8782 			}
8783 			if (!no_out_cnt) {
8784 				*num_out += (ctl_cnt + bundle_at);
8785 			}
8786 			if (bundle_at) {
8787 				/* setup for a RTO measurement */
8788 				tsns_sent = data_list[0]->rec.data.TSN_seq;
8789 				/* fill time if not already filled */
8790 				if (*now_filled == 0) {
8791 					(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8792 					*now_filled = 1;
8793 					*now = asoc->time_last_sent;
8794 				} else {
8795 					asoc->time_last_sent = *now;
8796 				}
8797 				if (net->rto_needed) {
8798 					data_list[0]->do_rtt = 1;
8799 					net->rto_needed = 0;
8800 				}
8801 				SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8802 				sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8803 			}
8804 			if (one_chunk) {
8805 				break;
8806 			}
8807 		}
8808 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8809 			sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8810 		}
8811 	}
8812 	if (old_start_at == NULL) {
8813 		old_start_at = start_at;
8814 		start_at = TAILQ_FIRST(&asoc->nets);
8815 		if (old_start_at)
8816 			goto again_one_more_time;
8817 	}
8818 	/*
8819 	 * At the end there should be no NON timed chunks hanging on this
8820 	 * queue.
8821 	 */
8822 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8823 		sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8824 	}
8825 	if ((*num_out == 0) && (*reason_code == 0)) {
8826 		*reason_code = 4;
8827 	} else {
8828 		*reason_code = 5;
8829 	}
8830 	sctp_clean_up_ctl(stcb, asoc, so_locked);
8831 	return (0);
8832 }
8833 
8834 void
8835 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8836 {
8837 	/*-
8838 	 * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8839 	 * the control chunk queue.
8840 	 */
8841 	struct sctp_chunkhdr *hdr;
8842 	struct sctp_tmit_chunk *chk;
8843 	struct mbuf *mat;
8844 
8845 	SCTP_TCB_LOCK_ASSERT(stcb);
8846 	sctp_alloc_a_chunk(stcb, chk);
8847 	if (chk == NULL) {
8848 		/* no memory */
8849 		sctp_m_freem(op_err);
8850 		return;
8851 	}
8852 	chk->copy_by_ref = 0;
8853 	SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8854 	if (op_err == NULL) {
8855 		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8856 		return;
8857 	}
8858 	chk->send_size = 0;
8859 	mat = op_err;
8860 	while (mat != NULL) {
8861 		chk->send_size += SCTP_BUF_LEN(mat);
8862 		mat = SCTP_BUF_NEXT(mat);
8863 	}
8864 	chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8865 	chk->rec.chunk_id.can_take_data = 1;
8866 	chk->sent = SCTP_DATAGRAM_UNSENT;
8867 	chk->snd_count = 0;
8868 	chk->flags = 0;
8869 	chk->asoc = &stcb->asoc;
8870 	chk->data = op_err;
8871 	chk->whoTo = NULL;
8872 	hdr = mtod(op_err, struct sctp_chunkhdr *);
8873 	hdr->chunk_type = SCTP_OPERATION_ERROR;
8874 	hdr->chunk_flags = 0;
8875 	hdr->chunk_length = htons(chk->send_size);
8876 	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8877 	    chk,
8878 	    sctp_next);
8879 	chk->asoc->ctrl_queue_cnt++;
8880 }
8881 
8882 int
8883 sctp_send_cookie_echo(struct mbuf *m,
8884     int offset,
8885     struct sctp_tcb *stcb,
8886     struct sctp_nets *net)
8887 {
8888 	/*-
8889 	 * pull out the cookie and put it at the front of the control chunk
8890 	 * queue.
8891 	 */
8892 	int at;
8893 	struct mbuf *cookie;
8894 	struct sctp_paramhdr parm, *phdr;
8895 	struct sctp_chunkhdr *hdr;
8896 	struct sctp_tmit_chunk *chk;
8897 	uint16_t ptype, plen;
8898 
8899 	/* First find the cookie in the param area */
8900 	cookie = NULL;
8901 	at = offset + sizeof(struct sctp_init_chunk);
8902 
8903 	SCTP_TCB_LOCK_ASSERT(stcb);
8904 	do {
8905 		phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8906 		if (phdr == NULL) {
8907 			return (-3);
8908 		}
8909 		ptype = ntohs(phdr->param_type);
8910 		plen = ntohs(phdr->param_length);
8911 		if (ptype == SCTP_STATE_COOKIE) {
8912 			int pad;
8913 
8914 			/* found the cookie */
8915 			if ((pad = (plen % 4))) {
8916 				plen += 4 - pad;
8917 			}
8918 			cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8919 			if (cookie == NULL) {
8920 				/* No memory */
8921 				return (-2);
8922 			}
8923 #ifdef SCTP_MBUF_LOGGING
8924 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8925 				struct mbuf *mat;
8926 
8927 				for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8928 					if (SCTP_BUF_IS_EXTENDED(mat)) {
8929 						sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8930 					}
8931 				}
8932 			}
8933 #endif
8934 			break;
8935 		}
8936 		at += SCTP_SIZE32(plen);
8937 	} while (phdr);
8938 	if (cookie == NULL) {
8939 		/* Did not find the cookie */
8940 		return (-3);
8941 	}
8942 	/* ok, we got the cookie lets change it into a cookie echo chunk */
8943 
8944 	/* first the change from param to cookie */
8945 	hdr = mtod(cookie, struct sctp_chunkhdr *);
8946 	hdr->chunk_type = SCTP_COOKIE_ECHO;
8947 	hdr->chunk_flags = 0;
8948 	/* get the chunk stuff now and place it in the FRONT of the queue */
8949 	sctp_alloc_a_chunk(stcb, chk);
8950 	if (chk == NULL) {
8951 		/* no memory */
8952 		sctp_m_freem(cookie);
8953 		return (-5);
8954 	}
8955 	chk->copy_by_ref = 0;
8956 	chk->send_size = plen;
8957 	chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8958 	chk->rec.chunk_id.can_take_data = 0;
8959 	chk->sent = SCTP_DATAGRAM_UNSENT;
8960 	chk->snd_count = 0;
8961 	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8962 	chk->asoc = &stcb->asoc;
8963 	chk->data = cookie;
8964 	chk->whoTo = net;
8965 	atomic_add_int(&chk->whoTo->ref_count, 1);
8966 	TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8967 	chk->asoc->ctrl_queue_cnt++;
8968 	return (0);
8969 }
8970 
8971 void
8972 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8973     struct mbuf *m,
8974     int offset,
8975     int chk_length,
8976     struct sctp_nets *net)
8977 {
8978 	/*
8979 	 * take a HB request and make it into a HB ack and send it.
8980 	 */
8981 	struct mbuf *outchain;
8982 	struct sctp_chunkhdr *chdr;
8983 	struct sctp_tmit_chunk *chk;
8984 
8985 
8986 	if (net == NULL)
8987 		/* must have a net pointer */
8988 		return;
8989 
8990 	outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8991 	if (outchain == NULL) {
8992 		/* gak out of memory */
8993 		return;
8994 	}
8995 #ifdef SCTP_MBUF_LOGGING
8996 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8997 		struct mbuf *mat;
8998 
8999 		for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
9000 			if (SCTP_BUF_IS_EXTENDED(mat)) {
9001 				sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9002 			}
9003 		}
9004 	}
9005 #endif
9006 	chdr = mtod(outchain, struct sctp_chunkhdr *);
9007 	chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9008 	chdr->chunk_flags = 0;
9009 	if (chk_length % 4) {
9010 		/* need pad */
9011 		uint32_t cpthis = 0;
9012 		int padlen;
9013 
9014 		padlen = 4 - (chk_length % 4);
9015 		m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9016 	}
9017 	sctp_alloc_a_chunk(stcb, chk);
9018 	if (chk == NULL) {
9019 		/* no memory */
9020 		sctp_m_freem(outchain);
9021 		return;
9022 	}
9023 	chk->copy_by_ref = 0;
9024 	chk->send_size = chk_length;
9025 	chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9026 	chk->rec.chunk_id.can_take_data = 1;
9027 	chk->sent = SCTP_DATAGRAM_UNSENT;
9028 	chk->snd_count = 0;
9029 	chk->flags = 0;
9030 	chk->asoc = &stcb->asoc;
9031 	chk->data = outchain;
9032 	chk->whoTo = net;
9033 	atomic_add_int(&chk->whoTo->ref_count, 1);
9034 	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9035 	chk->asoc->ctrl_queue_cnt++;
9036 }
9037 
9038 void
9039 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9040 {
9041 	/* formulate and queue a cookie-ack back to sender */
9042 	struct mbuf *cookie_ack;
9043 	struct sctp_chunkhdr *hdr;
9044 	struct sctp_tmit_chunk *chk;
9045 
9046 	cookie_ack = NULL;
9047 	SCTP_TCB_LOCK_ASSERT(stcb);
9048 
9049 	cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
9050 	if (cookie_ack == NULL) {
9051 		/* no mbuf's */
9052 		return;
9053 	}
9054 	SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9055 	sctp_alloc_a_chunk(stcb, chk);
9056 	if (chk == NULL) {
9057 		/* no memory */
9058 		sctp_m_freem(cookie_ack);
9059 		return;
9060 	}
9061 	chk->copy_by_ref = 0;
9062 	chk->send_size = sizeof(struct sctp_chunkhdr);
9063 	chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9064 	chk->rec.chunk_id.can_take_data = 1;
9065 	chk->sent = SCTP_DATAGRAM_UNSENT;
9066 	chk->snd_count = 0;
9067 	chk->flags = 0;
9068 	chk->asoc = &stcb->asoc;
9069 	chk->data = cookie_ack;
9070 	if (chk->asoc->last_control_chunk_from != NULL) {
9071 		chk->whoTo = chk->asoc->last_control_chunk_from;
9072 		atomic_add_int(&chk->whoTo->ref_count, 1);
9073 	} else {
9074 		chk->whoTo = NULL;
9075 	}
9076 	hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9077 	hdr->chunk_type = SCTP_COOKIE_ACK;
9078 	hdr->chunk_flags = 0;
9079 	hdr->chunk_length = htons(chk->send_size);
9080 	SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9081 	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9082 	chk->asoc->ctrl_queue_cnt++;
9083 	return;
9084 }
9085 
9086 
9087 void
9088 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9089 {
9090 	/* formulate and queue a SHUTDOWN-ACK back to the sender */
9091 	struct mbuf *m_shutdown_ack;
9092 	struct sctp_shutdown_ack_chunk *ack_cp;
9093 	struct sctp_tmit_chunk *chk;
9094 
9095 	m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9096 	if (m_shutdown_ack == NULL) {
9097 		/* no mbuf's */
9098 		return;
9099 	}
9100 	SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9101 	sctp_alloc_a_chunk(stcb, chk);
9102 	if (chk == NULL) {
9103 		/* no memory */
9104 		sctp_m_freem(m_shutdown_ack);
9105 		return;
9106 	}
9107 	chk->copy_by_ref = 0;
9108 	chk->send_size = sizeof(struct sctp_chunkhdr);
9109 	chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9110 	chk->rec.chunk_id.can_take_data = 1;
9111 	chk->sent = SCTP_DATAGRAM_UNSENT;
9112 	chk->snd_count = 0;
9113 	chk->flags = 0;
9114 	chk->asoc = &stcb->asoc;
9115 	chk->data = m_shutdown_ack;
9116 	chk->whoTo = net;
9117 	if (chk->whoTo) {
9118 		atomic_add_int(&chk->whoTo->ref_count, 1);
9119 	}
9120 	ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9121 	ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9122 	ack_cp->ch.chunk_flags = 0;
9123 	ack_cp->ch.chunk_length = htons(chk->send_size);
9124 	SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9125 	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9126 	chk->asoc->ctrl_queue_cnt++;
9127 	return;
9128 }
9129 
9130 void
9131 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9132 {
9133 	/* formulate and queue a SHUTDOWN to the sender */
9134 	struct mbuf *m_shutdown;
9135 	struct sctp_shutdown_chunk *shutdown_cp;
9136 	struct sctp_tmit_chunk *chk;
9137 
9138 	m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9139 	if (m_shutdown == NULL) {
9140 		/* no mbuf's */
9141 		return;
9142 	}
9143 	SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9144 	sctp_alloc_a_chunk(stcb, chk);
9145 	if (chk == NULL) {
9146 		/* no memory */
9147 		sctp_m_freem(m_shutdown);
9148 		return;
9149 	}
9150 	chk->copy_by_ref = 0;
9151 	chk->send_size = sizeof(struct sctp_shutdown_chunk);
9152 	chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9153 	chk->rec.chunk_id.can_take_data = 1;
9154 	chk->sent = SCTP_DATAGRAM_UNSENT;
9155 	chk->snd_count = 0;
9156 	chk->flags = 0;
9157 	chk->asoc = &stcb->asoc;
9158 	chk->data = m_shutdown;
9159 	chk->whoTo = net;
9160 	if (chk->whoTo) {
9161 		atomic_add_int(&chk->whoTo->ref_count, 1);
9162 	}
9163 	shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9164 	shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9165 	shutdown_cp->ch.chunk_flags = 0;
9166 	shutdown_cp->ch.chunk_length = htons(chk->send_size);
9167 	shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9168 	SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9169 	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9170 	chk->asoc->ctrl_queue_cnt++;
9171 	return;
9172 }
9173 
9174 void
9175 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9176 {
9177 	/*
9178 	 * formulate and queue an ASCONF to the peer. ASCONF parameters
9179 	 * should be queued on the assoc queue.
9180 	 */
9181 	struct sctp_tmit_chunk *chk;
9182 	struct mbuf *m_asconf;
9183 	int len;
9184 
9185 	SCTP_TCB_LOCK_ASSERT(stcb);
9186 
9187 	if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9188 	    (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9189 		/* can't send a new one if there is one in flight already */
9190 		return;
9191 	}
9192 	/* compose an ASCONF chunk, maximum length is PMTU */
9193 	m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9194 	if (m_asconf == NULL) {
9195 		return;
9196 	}
9197 	sctp_alloc_a_chunk(stcb, chk);
9198 	if (chk == NULL) {
9199 		/* no memory */
9200 		sctp_m_freem(m_asconf);
9201 		return;
9202 	}
9203 	chk->copy_by_ref = 0;
9204 	chk->data = m_asconf;
9205 	chk->send_size = len;
9206 	chk->rec.chunk_id.id = SCTP_ASCONF;
9207 	chk->rec.chunk_id.can_take_data = 0;
9208 	chk->sent = SCTP_DATAGRAM_UNSENT;
9209 	chk->snd_count = 0;
9210 	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9211 	chk->asoc = &stcb->asoc;
9212 	chk->whoTo = net;
9213 	if (chk->whoTo) {
9214 		atomic_add_int(&chk->whoTo->ref_count, 1);
9215 	}
9216 	TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9217 	chk->asoc->ctrl_queue_cnt++;
9218 	return;
9219 }
9220 
9221 void
9222 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9223 {
9224 	/*
9225 	 * formulate and queue a asconf-ack back to sender. the asconf-ack
9226 	 * must be stored in the tcb.
9227 	 */
9228 	struct sctp_tmit_chunk *chk;
9229 	struct sctp_asconf_ack *ack, *latest_ack;
9230 	struct mbuf *m_ack;
9231 	struct sctp_nets *net = NULL;
9232 
9233 	SCTP_TCB_LOCK_ASSERT(stcb);
9234 	/* Get the latest ASCONF-ACK */
9235 	latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9236 	if (latest_ack == NULL) {
9237 		return;
9238 	}
9239 	if (latest_ack->last_sent_to != NULL &&
9240 	    latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9241 		/* we're doing a retransmission */
9242 		net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9243 		if (net == NULL) {
9244 			/* no alternate */
9245 			if (stcb->asoc.last_control_chunk_from == NULL) {
9246 				if (stcb->asoc.alternate) {
9247 					net = stcb->asoc.alternate;
9248 				} else {
9249 					net = stcb->asoc.primary_destination;
9250 				}
9251 			} else {
9252 				net = stcb->asoc.last_control_chunk_from;
9253 			}
9254 		}
9255 	} else {
9256 		/* normal case */
9257 		if (stcb->asoc.last_control_chunk_from == NULL) {
9258 			if (stcb->asoc.alternate) {
9259 				net = stcb->asoc.alternate;
9260 			} else {
9261 				net = stcb->asoc.primary_destination;
9262 			}
9263 		} else {
9264 			net = stcb->asoc.last_control_chunk_from;
9265 		}
9266 	}
9267 	latest_ack->last_sent_to = net;
9268 
9269 	TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9270 		if (ack->data == NULL) {
9271 			continue;
9272 		}
9273 		/* copy the asconf_ack */
9274 		m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9275 		if (m_ack == NULL) {
9276 			/* couldn't copy it */
9277 			return;
9278 		}
9279 #ifdef SCTP_MBUF_LOGGING
9280 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9281 			struct mbuf *mat;
9282 
9283 			for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9284 				if (SCTP_BUF_IS_EXTENDED(mat)) {
9285 					sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9286 				}
9287 			}
9288 		}
9289 #endif
9290 
9291 		sctp_alloc_a_chunk(stcb, chk);
9292 		if (chk == NULL) {
9293 			/* no memory */
9294 			if (m_ack)
9295 				sctp_m_freem(m_ack);
9296 			return;
9297 		}
9298 		chk->copy_by_ref = 0;
9299 
9300 		chk->whoTo = net;
9301 		if (chk->whoTo) {
9302 			atomic_add_int(&chk->whoTo->ref_count, 1);
9303 		}
9304 		chk->data = m_ack;
9305 		chk->send_size = 0;
9306 		/* Get size */
9307 		chk->send_size = ack->len;
9308 		chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9309 		chk->rec.chunk_id.can_take_data = 1;
9310 		chk->sent = SCTP_DATAGRAM_UNSENT;
9311 		chk->snd_count = 0;
9312 		chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;	/* XXX */
9313 		chk->asoc = &stcb->asoc;
9314 
9315 		TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9316 		chk->asoc->ctrl_queue_cnt++;
9317 	}
9318 	return;
9319 }
9320 
9321 
9322 static int
9323 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9324     struct sctp_tcb *stcb,
9325     struct sctp_association *asoc,
9326     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9327 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9328     SCTP_UNUSED
9329 #endif
9330 )
9331 {
9332 	/*-
9333 	 * send out one MTU of retransmission. If fast_retransmit is
9334 	 * happening we ignore the cwnd. Otherwise we obey the cwnd and
9335 	 * rwnd. For a Cookie or Asconf in the control chunk queue we
9336 	 * retransmit them by themselves.
9337 	 *
9338 	 * For data chunks we will pick out the lowest TSN's in the sent_queue
9339 	 * marked for resend and bundle them all together (up to a MTU of
9340 	 * destination). The address to send to should have been
9341 	 * selected/changed where the retransmission was marked (i.e. in FR
9342 	 * or t3-timeout routines).
9343 	 */
9344 	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9345 	struct sctp_tmit_chunk *chk, *fwd;
9346 	struct mbuf *m, *endofchain;
9347 	struct sctp_nets *net = NULL;
9348 	uint32_t tsns_sent = 0;
9349 	int no_fragmentflg, bundle_at, cnt_thru;
9350 	unsigned int mtu;
9351 	int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9352 	struct sctp_auth_chunk *auth = NULL;
9353 	uint32_t auth_offset = 0;
9354 	uint16_t auth_keyid;
9355 	int override_ok = 1;
9356 	int data_auth_reqd = 0;
9357 	uint32_t dmtu = 0;
9358 
9359 	SCTP_TCB_LOCK_ASSERT(stcb);
9360 	tmr_started = ctl_cnt = bundle_at = error = 0;
9361 	no_fragmentflg = 1;
9362 	fwd_tsn = 0;
9363 	*cnt_out = 0;
9364 	fwd = NULL;
9365 	endofchain = m = NULL;
9366 	auth_keyid = stcb->asoc.authinfo.active_keyid;
9367 #ifdef SCTP_AUDITING_ENABLED
9368 	sctp_audit_log(0xC3, 1);
9369 #endif
9370 	if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9371 	    (TAILQ_EMPTY(&asoc->control_send_queue))) {
9372 		SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9373 		    asoc->sent_queue_retran_cnt);
9374 		asoc->sent_queue_cnt = 0;
9375 		asoc->sent_queue_cnt_removeable = 0;
9376 		/* send back 0/0 so we enter normal transmission */
9377 		*cnt_out = 0;
9378 		return (0);
9379 	}
9380 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9381 		if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9382 		    (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9383 		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9384 			if (chk->sent != SCTP_DATAGRAM_RESEND) {
9385 				continue;
9386 			}
9387 			if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9388 				if (chk != asoc->str_reset) {
9389 					/*
9390 					 * not eligible for retran if its
9391 					 * not ours
9392 					 */
9393 					continue;
9394 				}
9395 			}
9396 			ctl_cnt++;
9397 			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9398 				fwd_tsn = 1;
9399 			}
9400 			/*
9401 			 * Add an AUTH chunk, if chunk requires it save the
9402 			 * offset into the chain for AUTH
9403 			 */
9404 			if ((auth == NULL) &&
9405 			    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9406 			    stcb->asoc.peer_auth_chunks))) {
9407 				m = sctp_add_auth_chunk(m, &endofchain,
9408 				    &auth, &auth_offset,
9409 				    stcb,
9410 				    chk->rec.chunk_id.id);
9411 				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9412 			}
9413 			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9414 			break;
9415 		}
9416 	}
9417 	one_chunk = 0;
9418 	cnt_thru = 0;
9419 	/* do we have control chunks to retransmit? */
9420 	if (m != NULL) {
9421 		/* Start a timer no matter if we suceed or fail */
9422 		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9423 			sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9424 		} else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9425 			sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9426 		chk->snd_count++;	/* update our count */
9427 		if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9428 		    (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9429 		    auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9430 		    no_fragmentflg, 0, 0,
9431 		    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9432 		    chk->whoTo->port, so_locked, NULL, NULL))) {
9433 			SCTP_STAT_INCR(sctps_lowlevelerr);
9434 			return (error);
9435 		}
9436 		endofchain = NULL;
9437 		auth = NULL;
9438 		auth_offset = 0;
9439 		/*
9440 		 * We don't want to mark the net->sent time here since this
9441 		 * we use this for HB and retrans cannot measure RTT
9442 		 */
9443 		/* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9444 		*cnt_out += 1;
9445 		chk->sent = SCTP_DATAGRAM_SENT;
9446 		sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9447 		if (fwd_tsn == 0) {
9448 			return (0);
9449 		} else {
9450 			/* Clean up the fwd-tsn list */
9451 			sctp_clean_up_ctl(stcb, asoc, so_locked);
9452 			return (0);
9453 		}
9454 	}
9455 	/*
9456 	 * Ok, it is just data retransmission we need to do or that and a
9457 	 * fwd-tsn with it all.
9458 	 */
9459 	if (TAILQ_EMPTY(&asoc->sent_queue)) {
9460 		return (SCTP_RETRAN_DONE);
9461 	}
9462 	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9463 	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9464 		/* not yet open, resend the cookie and that is it */
9465 		return (1);
9466 	}
9467 #ifdef SCTP_AUDITING_ENABLED
9468 	sctp_auditing(20, inp, stcb, NULL);
9469 #endif
9470 	data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9471 	TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9472 		if (chk->sent != SCTP_DATAGRAM_RESEND) {
9473 			/* No, not sent to this net or not ready for rtx */
9474 			continue;
9475 		}
9476 		if (chk->data == NULL) {
9477 			SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9478 			    chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9479 			continue;
9480 		}
9481 		if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9482 		    (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9483 			/* Gak, we have exceeded max unlucky retran, abort! */
9484 			SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9485 			    chk->snd_count,
9486 			    SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9487 			atomic_add_int(&stcb->asoc.refcnt, 1);
9488 			sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9489 			SCTP_TCB_LOCK(stcb);
9490 			atomic_subtract_int(&stcb->asoc.refcnt, 1);
9491 			return (SCTP_RETRAN_EXIT);
9492 		}
9493 		/* pick up the net */
9494 		net = chk->whoTo;
9495 		switch (net->ro._l_addr.sa.sa_family) {
9496 #ifdef INET
9497 		case AF_INET:
9498 			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9499 			break;
9500 #endif
9501 #ifdef INET6
9502 		case AF_INET6:
9503 			mtu = net->mtu - SCTP_MIN_OVERHEAD;
9504 			break;
9505 #endif
9506 		default:
9507 			/* TSNH */
9508 			mtu = net->mtu;
9509 			break;
9510 		}
9511 
9512 		if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9513 			/* No room in peers rwnd */
9514 			uint32_t tsn;
9515 
9516 			tsn = asoc->last_acked_seq + 1;
9517 			if (tsn == chk->rec.data.TSN_seq) {
9518 				/*
9519 				 * we make a special exception for this
9520 				 * case. The peer has no rwnd but is missing
9521 				 * the lowest chunk.. which is probably what
9522 				 * is holding up the rwnd.
9523 				 */
9524 				goto one_chunk_around;
9525 			}
9526 			return (1);
9527 		}
9528 one_chunk_around:
9529 		if (asoc->peers_rwnd < mtu) {
9530 			one_chunk = 1;
9531 			if ((asoc->peers_rwnd == 0) &&
9532 			    (asoc->total_flight == 0)) {
9533 				chk->window_probe = 1;
9534 				chk->whoTo->window_probe = 1;
9535 			}
9536 		}
9537 #ifdef SCTP_AUDITING_ENABLED
9538 		sctp_audit_log(0xC3, 2);
9539 #endif
9540 		bundle_at = 0;
9541 		m = NULL;
9542 		net->fast_retran_ip = 0;
9543 		if (chk->rec.data.doing_fast_retransmit == 0) {
9544 			/*
9545 			 * if no FR in progress skip destination that have
9546 			 * flight_size > cwnd.
9547 			 */
9548 			if (net->flight_size >= net->cwnd) {
9549 				continue;
9550 			}
9551 		} else {
9552 			/*
9553 			 * Mark the destination net to have FR recovery
9554 			 * limits put on it.
9555 			 */
9556 			*fr_done = 1;
9557 			net->fast_retran_ip = 1;
9558 		}
9559 
9560 		/*
9561 		 * if no AUTH is yet included and this chunk requires it,
9562 		 * make sure to account for it.  We don't apply the size
9563 		 * until the AUTH chunk is actually added below in case
9564 		 * there is no room for this chunk.
9565 		 */
9566 		if (data_auth_reqd && (auth == NULL)) {
9567 			dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9568 		} else
9569 			dmtu = 0;
9570 
9571 		if ((chk->send_size <= (mtu - dmtu)) ||
9572 		    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9573 			/* ok we will add this one */
9574 			if (data_auth_reqd) {
9575 				if (auth == NULL) {
9576 					m = sctp_add_auth_chunk(m,
9577 					    &endofchain,
9578 					    &auth,
9579 					    &auth_offset,
9580 					    stcb,
9581 					    SCTP_DATA);
9582 					auth_keyid = chk->auth_keyid;
9583 					override_ok = 0;
9584 					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9585 				} else if (override_ok) {
9586 					auth_keyid = chk->auth_keyid;
9587 					override_ok = 0;
9588 				} else if (chk->auth_keyid != auth_keyid) {
9589 					/* different keyid, so done bundling */
9590 					break;
9591 				}
9592 			}
9593 			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9594 			if (m == NULL) {
9595 				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9596 				return (ENOMEM);
9597 			}
9598 			/* Do clear IP_DF ? */
9599 			if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9600 				no_fragmentflg = 0;
9601 			}
9602 			/* upate our MTU size */
9603 			if (mtu > (chk->send_size + dmtu))
9604 				mtu -= (chk->send_size + dmtu);
9605 			else
9606 				mtu = 0;
9607 			data_list[bundle_at++] = chk;
9608 			if (one_chunk && (asoc->total_flight <= 0)) {
9609 				SCTP_STAT_INCR(sctps_windowprobed);
9610 			}
9611 		}
9612 		if (one_chunk == 0) {
9613 			/*
9614 			 * now are there anymore forward from chk to pick
9615 			 * up?
9616 			 */
9617 			for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9618 				if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9619 					/* Nope, not for retran */
9620 					continue;
9621 				}
9622 				if (fwd->whoTo != net) {
9623 					/* Nope, not the net in question */
9624 					continue;
9625 				}
9626 				if (data_auth_reqd && (auth == NULL)) {
9627 					dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9628 				} else
9629 					dmtu = 0;
9630 				if (fwd->send_size <= (mtu - dmtu)) {
9631 					if (data_auth_reqd) {
9632 						if (auth == NULL) {
9633 							m = sctp_add_auth_chunk(m,
9634 							    &endofchain,
9635 							    &auth,
9636 							    &auth_offset,
9637 							    stcb,
9638 							    SCTP_DATA);
9639 							auth_keyid = fwd->auth_keyid;
9640 							override_ok = 0;
9641 							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9642 						} else if (override_ok) {
9643 							auth_keyid = fwd->auth_keyid;
9644 							override_ok = 0;
9645 						} else if (fwd->auth_keyid != auth_keyid) {
9646 							/*
9647 							 * different keyid,
9648 							 * so done bundling
9649 							 */
9650 							break;
9651 						}
9652 					}
9653 					m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9654 					if (m == NULL) {
9655 						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9656 						return (ENOMEM);
9657 					}
9658 					/* Do clear IP_DF ? */
9659 					if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9660 						no_fragmentflg = 0;
9661 					}
9662 					/* upate our MTU size */
9663 					if (mtu > (fwd->send_size + dmtu))
9664 						mtu -= (fwd->send_size + dmtu);
9665 					else
9666 						mtu = 0;
9667 					data_list[bundle_at++] = fwd;
9668 					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9669 						break;
9670 					}
9671 				} else {
9672 					/* can't fit so we are done */
9673 					break;
9674 				}
9675 			}
9676 		}
9677 		/* Is there something to send for this destination? */
9678 		if (m) {
9679 			/*
9680 			 * No matter if we fail/or suceed we should start a
9681 			 * timer. A failure is like a lost IP packet :-)
9682 			 */
9683 			if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9684 				/*
9685 				 * no timer running on this destination
9686 				 * restart it.
9687 				 */
9688 				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9689 				tmr_started = 1;
9690 			}
9691 			/* Now lets send it, if there is anything to send :> */
9692 			if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9693 			    (struct sockaddr *)&net->ro._l_addr, m,
9694 			    auth_offset, auth, auth_keyid,
9695 			    no_fragmentflg, 0, 0,
9696 			    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9697 			    net->port, so_locked, NULL, NULL))) {
9698 				/* error, we could not output */
9699 				SCTP_STAT_INCR(sctps_lowlevelerr);
9700 				return (error);
9701 			}
9702 			endofchain = NULL;
9703 			auth = NULL;
9704 			auth_offset = 0;
9705 			/* For HB's */
9706 			/*
9707 			 * We don't want to mark the net->sent time here
9708 			 * since this we use this for HB and retrans cannot
9709 			 * measure RTT
9710 			 */
9711 			/* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9712 
9713 			/* For auto-close */
9714 			cnt_thru++;
9715 			if (*now_filled == 0) {
9716 				(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9717 				*now = asoc->time_last_sent;
9718 				*now_filled = 1;
9719 			} else {
9720 				asoc->time_last_sent = *now;
9721 			}
9722 			*cnt_out += bundle_at;
9723 #ifdef SCTP_AUDITING_ENABLED
9724 			sctp_audit_log(0xC4, bundle_at);
9725 #endif
9726 			if (bundle_at) {
9727 				tsns_sent = data_list[0]->rec.data.TSN_seq;
9728 			}
9729 			for (i = 0; i < bundle_at; i++) {
9730 				SCTP_STAT_INCR(sctps_sendretransdata);
9731 				data_list[i]->sent = SCTP_DATAGRAM_SENT;
9732 				/*
9733 				 * When we have a revoked data, and we
9734 				 * retransmit it, then we clear the revoked
9735 				 * flag since this flag dictates if we
9736 				 * subtracted from the fs
9737 				 */
9738 				if (data_list[i]->rec.data.chunk_was_revoked) {
9739 					/* Deflate the cwnd */
9740 					data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9741 					data_list[i]->rec.data.chunk_was_revoked = 0;
9742 				}
9743 				data_list[i]->snd_count++;
9744 				sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9745 				/* record the time */
9746 				data_list[i]->sent_rcv_time = asoc->time_last_sent;
9747 				if (data_list[i]->book_size_scale) {
9748 					/*
9749 					 * need to double the book size on
9750 					 * this one
9751 					 */
9752 					data_list[i]->book_size_scale = 0;
9753 					/*
9754 					 * Since we double the booksize, we
9755 					 * must also double the output queue
9756 					 * size, since this get shrunk when
9757 					 * we free by this amount.
9758 					 */
9759 					atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9760 					data_list[i]->book_size *= 2;
9761 
9762 
9763 				} else {
9764 					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9765 						sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9766 						    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9767 					}
9768 					asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9769 					    (uint32_t) (data_list[i]->send_size +
9770 					    SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9771 				}
9772 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9773 					sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9774 					    data_list[i]->whoTo->flight_size,
9775 					    data_list[i]->book_size,
9776 					    (uintptr_t) data_list[i]->whoTo,
9777 					    data_list[i]->rec.data.TSN_seq);
9778 				}
9779 				sctp_flight_size_increase(data_list[i]);
9780 				sctp_total_flight_increase(stcb, data_list[i]);
9781 				if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9782 					/* SWS sender side engages */
9783 					asoc->peers_rwnd = 0;
9784 				}
9785 				if ((i == 0) &&
9786 				    (data_list[i]->rec.data.doing_fast_retransmit)) {
9787 					SCTP_STAT_INCR(sctps_sendfastretrans);
9788 					if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9789 					    (tmr_started == 0)) {
9790 						/*-
9791 						 * ok we just fast-retrans'd
9792 						 * the lowest TSN, i.e the
9793 						 * first on the list. In
9794 						 * this case we want to give
9795 						 * some more time to get a
9796 						 * SACK back without a
9797 						 * t3-expiring.
9798 						 */
9799 						sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9800 						    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9801 						sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9802 					}
9803 				}
9804 			}
9805 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9806 				sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9807 			}
9808 #ifdef SCTP_AUDITING_ENABLED
9809 			sctp_auditing(21, inp, stcb, NULL);
9810 #endif
9811 		} else {
9812 			/* None will fit */
9813 			return (1);
9814 		}
9815 		if (asoc->sent_queue_retran_cnt <= 0) {
9816 			/* all done we have no more to retran */
9817 			asoc->sent_queue_retran_cnt = 0;
9818 			break;
9819 		}
9820 		if (one_chunk) {
9821 			/* No more room in rwnd */
9822 			return (1);
9823 		}
9824 		/* stop the for loop here. we sent out a packet */
9825 		break;
9826 	}
9827 	return (0);
9828 }
9829 
9830 static void
9831 sctp_timer_validation(struct sctp_inpcb *inp,
9832     struct sctp_tcb *stcb,
9833     struct sctp_association *asoc)
9834 {
9835 	struct sctp_nets *net;
9836 
9837 	/* Validate that a timer is running somewhere */
9838 	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9839 		if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9840 			/* Here is a timer */
9841 			return;
9842 		}
9843 	}
9844 	SCTP_TCB_LOCK_ASSERT(stcb);
9845 	/* Gak, we did not have a timer somewhere */
9846 	SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9847 	if (asoc->alternate) {
9848 		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9849 	} else {
9850 		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9851 	}
9852 	return;
9853 }
9854 
9855 void
9856 sctp_chunk_output(struct sctp_inpcb *inp,
9857     struct sctp_tcb *stcb,
9858     int from_where,
9859     int so_locked
9860 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9861     SCTP_UNUSED
9862 #endif
9863 )
9864 {
9865 	/*-
9866 	 * Ok this is the generic chunk service queue. we must do the
9867 	 * following:
9868 	 * - See if there are retransmits pending, if so we must
9869 	 *   do these first.
9870 	 * - Service the stream queue that is next, moving any
9871 	 *   message (note I must get a complete message i.e.
9872 	 *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9873 	 *   TSN's
9874 	 * - Check to see if the cwnd/rwnd allows any output, if so we
9875 	 *   go ahead and fomulate and send the low level chunks. Making sure
9876 	 *   to combine any control in the control chunk queue also.
9877 	 */
9878 	struct sctp_association *asoc;
9879 	struct sctp_nets *net;
9880 	int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9881 	unsigned int burst_cnt = 0;
9882 	struct timeval now;
9883 	int now_filled = 0;
9884 	int nagle_on;
9885 	int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9886 	int un_sent = 0;
9887 	int fr_done;
9888 	unsigned int tot_frs = 0;
9889 
9890 	asoc = &stcb->asoc;
9891 	/* The Nagle algorithm is only applied when handling a send call. */
9892 	if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9893 		if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9894 			nagle_on = 0;
9895 		} else {
9896 			nagle_on = 1;
9897 		}
9898 	} else {
9899 		nagle_on = 0;
9900 	}
9901 	SCTP_TCB_LOCK_ASSERT(stcb);
9902 
9903 	un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9904 
9905 	if ((un_sent <= 0) &&
9906 	    (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9907 	    (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9908 	    (asoc->sent_queue_retran_cnt == 0)) {
9909 		/* Nothing to do unless there is something to be sent left */
9910 		return;
9911 	}
9912 	/*
9913 	 * Do we have something to send, data or control AND a sack timer
9914 	 * running, if so piggy-back the sack.
9915 	 */
9916 	if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9917 		sctp_send_sack(stcb, so_locked);
9918 		(void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9919 	}
9920 	while (asoc->sent_queue_retran_cnt) {
9921 		/*-
9922 		 * Ok, it is retransmission time only, we send out only ONE
9923 		 * packet with a single call off to the retran code.
9924 		 */
9925 		if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9926 			/*-
9927 			 * Special hook for handling cookiess discarded
9928 			 * by peer that carried data. Send cookie-ack only
9929 			 * and then the next call with get the retran's.
9930 			 */
9931 			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9932 			    from_where,
9933 			    &now, &now_filled, frag_point, so_locked);
9934 			return;
9935 		} else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9936 			/* if its not from a HB then do it */
9937 			fr_done = 0;
9938 			ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9939 			if (fr_done) {
9940 				tot_frs++;
9941 			}
9942 		} else {
9943 			/*
9944 			 * its from any other place, we don't allow retran
9945 			 * output (only control)
9946 			 */
9947 			ret = 1;
9948 		}
9949 		if (ret > 0) {
9950 			/* Can't send anymore */
9951 			/*-
9952 			 * now lets push out control by calling med-level
9953 			 * output once. this assures that we WILL send HB's
9954 			 * if queued too.
9955 			 */
9956 			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9957 			    from_where,
9958 			    &now, &now_filled, frag_point, so_locked);
9959 #ifdef SCTP_AUDITING_ENABLED
9960 			sctp_auditing(8, inp, stcb, NULL);
9961 #endif
9962 			sctp_timer_validation(inp, stcb, asoc);
9963 			return;
9964 		}
9965 		if (ret < 0) {
9966 			/*-
9967 			 * The count was off.. retran is not happening so do
9968 			 * the normal retransmission.
9969 			 */
9970 #ifdef SCTP_AUDITING_ENABLED
9971 			sctp_auditing(9, inp, stcb, NULL);
9972 #endif
9973 			if (ret == SCTP_RETRAN_EXIT) {
9974 				return;
9975 			}
9976 			break;
9977 		}
9978 		if (from_where == SCTP_OUTPUT_FROM_T3) {
9979 			/* Only one transmission allowed out of a timeout */
9980 #ifdef SCTP_AUDITING_ENABLED
9981 			sctp_auditing(10, inp, stcb, NULL);
9982 #endif
9983 			/* Push out any control */
9984 			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9985 			    &now, &now_filled, frag_point, so_locked);
9986 			return;
9987 		}
9988 		if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9989 			/* Hit FR burst limit */
9990 			return;
9991 		}
9992 		if ((num_out == 0) && (ret == 0)) {
9993 			/* No more retrans to send */
9994 			break;
9995 		}
9996 	}
9997 #ifdef SCTP_AUDITING_ENABLED
9998 	sctp_auditing(12, inp, stcb, NULL);
9999 #endif
10000 	/* Check for bad destinations, if they exist move chunks around. */
10001 	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10002 		if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10003 			/*-
10004 			 * if possible move things off of this address we
10005 			 * still may send below due to the dormant state but
10006 			 * we try to find an alternate address to send to
10007 			 * and if we have one we move all queued data on the
10008 			 * out wheel to this alternate address.
10009 			 */
10010 			if (net->ref_count > 1)
10011 				sctp_move_chunks_from_net(stcb, net);
10012 		} else {
10013 			/*-
10014 			 * if ((asoc->sat_network) || (net->addr_is_local))
10015 			 * { burst_limit = asoc->max_burst *
10016 			 * SCTP_SAT_NETWORK_BURST_INCR; }
10017 			 */
10018 			if (asoc->max_burst > 0) {
10019 				if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10020 					if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10021 						/*
10022 						 * JRS - Use the congestion
10023 						 * control given in the
10024 						 * congestion control module
10025 						 */
10026 						asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10027 						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10028 							sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10029 						}
10030 						SCTP_STAT_INCR(sctps_maxburstqueued);
10031 					}
10032 					net->fast_retran_ip = 0;
10033 				} else {
10034 					if (net->flight_size == 0) {
10035 						/*
10036 						 * Should be decaying the
10037 						 * cwnd here
10038 						 */
10039 						;
10040 					}
10041 				}
10042 			}
10043 		}
10044 
10045 	}
10046 	burst_cnt = 0;
10047 	do {
10048 		error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10049 		    &reason_code, 0, from_where,
10050 		    &now, &now_filled, frag_point, so_locked);
10051 		if (error) {
10052 			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10053 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10054 				sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10055 			}
10056 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10057 				sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10058 				sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10059 			}
10060 			break;
10061 		}
10062 		SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10063 
10064 		tot_out += num_out;
10065 		burst_cnt++;
10066 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10067 			sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10068 			if (num_out == 0) {
10069 				sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10070 			}
10071 		}
10072 		if (nagle_on) {
10073 			/*
10074 			 * When the Nagle algorithm is used, look at how
10075 			 * much is unsent, then if its smaller than an MTU
10076 			 * and we have data in flight we stop, except if we
10077 			 * are handling a fragmented user message.
10078 			 */
10079 			un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10080 			    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10081 			if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10082 			    (stcb->asoc.total_flight > 0) &&
10083 			    ((stcb->asoc.locked_on_sending == NULL) ||
10084 			    sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10085 				break;
10086 			}
10087 		}
10088 		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10089 		    TAILQ_EMPTY(&asoc->send_queue) &&
10090 		    stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10091 			/* Nothing left to send */
10092 			break;
10093 		}
10094 		if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10095 			/* Nothing left to send */
10096 			break;
10097 		}
10098 	} while (num_out &&
10099 	    ((asoc->max_burst == 0) ||
10100 	    SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10101 	    (burst_cnt < asoc->max_burst)));
10102 
10103 	if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10104 		if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10105 			SCTP_STAT_INCR(sctps_maxburstqueued);
10106 			asoc->burst_limit_applied = 1;
10107 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10108 				sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10109 			}
10110 		} else {
10111 			asoc->burst_limit_applied = 0;
10112 		}
10113 	}
10114 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10115 		sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10116 	}
10117 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10118 	    tot_out);
10119 
10120 	/*-
10121 	 * Now we need to clean up the control chunk chain if a ECNE is on
10122 	 * it. It must be marked as UNSENT again so next call will continue
10123 	 * to send it until such time that we get a CWR, to remove it.
10124 	 */
10125 	if (stcb->asoc.ecn_echo_cnt_onq)
10126 		sctp_fix_ecn_echo(asoc);
10127 	return;
10128 }
10129 
10130 
10131 int
10132 sctp_output(
10133     struct sctp_inpcb *inp,
10134     struct mbuf *m,
10135     struct sockaddr *addr,
10136     struct mbuf *control,
10137     struct thread *p,
10138     int flags)
10139 {
10140 	if (inp == NULL) {
10141 		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10142 		return (EINVAL);
10143 	}
10144 	if (inp->sctp_socket == NULL) {
10145 		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10146 		return (EINVAL);
10147 	}
10148 	return (sctp_sosend(inp->sctp_socket,
10149 	    addr,
10150 	    (struct uio *)NULL,
10151 	    m,
10152 	    control,
10153 	    flags, p
10154 	    ));
10155 }
10156 
10157 void
10158 send_forward_tsn(struct sctp_tcb *stcb,
10159     struct sctp_association *asoc)
10160 {
10161 	struct sctp_tmit_chunk *chk;
10162 	struct sctp_forward_tsn_chunk *fwdtsn;
10163 	uint32_t advance_peer_ack_point;
10164 
10165 	SCTP_TCB_LOCK_ASSERT(stcb);
10166 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10167 		if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10168 			/* mark it to unsent */
10169 			chk->sent = SCTP_DATAGRAM_UNSENT;
10170 			chk->snd_count = 0;
10171 			/* Do we correct its output location? */
10172 			if (chk->whoTo) {
10173 				sctp_free_remote_addr(chk->whoTo);
10174 				chk->whoTo = NULL;
10175 			}
10176 			goto sctp_fill_in_rest;
10177 		}
10178 	}
10179 	/* Ok if we reach here we must build one */
10180 	sctp_alloc_a_chunk(stcb, chk);
10181 	if (chk == NULL) {
10182 		return;
10183 	}
10184 	asoc->fwd_tsn_cnt++;
10185 	chk->copy_by_ref = 0;
10186 	chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10187 	chk->rec.chunk_id.can_take_data = 0;
10188 	chk->asoc = asoc;
10189 	chk->whoTo = NULL;
10190 	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10191 	if (chk->data == NULL) {
10192 		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10193 		return;
10194 	}
10195 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10196 	chk->sent = SCTP_DATAGRAM_UNSENT;
10197 	chk->snd_count = 0;
10198 	TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10199 	asoc->ctrl_queue_cnt++;
10200 sctp_fill_in_rest:
10201 	/*-
10202 	 * Here we go through and fill out the part that deals with
10203 	 * stream/seq of the ones we skip.
10204 	 */
10205 	SCTP_BUF_LEN(chk->data) = 0;
10206 	{
10207 		struct sctp_tmit_chunk *at, *tp1, *last;
10208 		struct sctp_strseq *strseq;
10209 		unsigned int cnt_of_space, i, ovh;
10210 		unsigned int space_needed;
10211 		unsigned int cnt_of_skipped = 0;
10212 
10213 		TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10214 			if (at->sent != SCTP_FORWARD_TSN_SKIP) {
10215 				/* no more to look at */
10216 				break;
10217 			}
10218 			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10219 				/* We don't report these */
10220 				continue;
10221 			}
10222 			cnt_of_skipped++;
10223 		}
10224 		space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10225 		    (cnt_of_skipped * sizeof(struct sctp_strseq)));
10226 
10227 		cnt_of_space = M_TRAILINGSPACE(chk->data);
10228 
10229 		if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10230 			ovh = SCTP_MIN_OVERHEAD;
10231 		} else {
10232 			ovh = SCTP_MIN_V4_OVERHEAD;
10233 		}
10234 		if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10235 			/* trim to a mtu size */
10236 			cnt_of_space = asoc->smallest_mtu - ovh;
10237 		}
10238 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10239 			sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10240 			    0xff, 0, cnt_of_skipped,
10241 			    asoc->advanced_peer_ack_point);
10242 
10243 		}
10244 		advance_peer_ack_point = asoc->advanced_peer_ack_point;
10245 		if (cnt_of_space < space_needed) {
10246 			/*-
10247 			 * ok we must trim down the chunk by lowering the
10248 			 * advance peer ack point.
10249 			 */
10250 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10251 				sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10252 				    0xff, 0xff, cnt_of_space,
10253 				    space_needed);
10254 			}
10255 			cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10256 			cnt_of_skipped /= sizeof(struct sctp_strseq);
10257 			/*-
10258 			 * Go through and find the TSN that will be the one
10259 			 * we report.
10260 			 */
10261 			at = TAILQ_FIRST(&asoc->sent_queue);
10262 			if (at != NULL) {
10263 				for (i = 0; i < cnt_of_skipped; i++) {
10264 					tp1 = TAILQ_NEXT(at, sctp_next);
10265 					if (tp1 == NULL) {
10266 						break;
10267 					}
10268 					at = tp1;
10269 				}
10270 			}
10271 			if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10272 				sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10273 				    0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10274 				    asoc->advanced_peer_ack_point);
10275 			}
10276 			last = at;
10277 			/*-
10278 			 * last now points to last one I can report, update
10279 			 * peer ack point
10280 			 */
10281 			if (last)
10282 				advance_peer_ack_point = last->rec.data.TSN_seq;
10283 			space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10284 			    cnt_of_skipped * sizeof(struct sctp_strseq);
10285 		}
10286 		chk->send_size = space_needed;
10287 		/* Setup the chunk */
10288 		fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10289 		fwdtsn->ch.chunk_length = htons(chk->send_size);
10290 		fwdtsn->ch.chunk_flags = 0;
10291 		fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10292 		fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10293 		SCTP_BUF_LEN(chk->data) = chk->send_size;
10294 		fwdtsn++;
10295 		/*-
10296 		 * Move pointer to after the fwdtsn and transfer to the
10297 		 * strseq pointer.
10298 		 */
10299 		strseq = (struct sctp_strseq *)fwdtsn;
10300 		/*-
10301 		 * Now populate the strseq list. This is done blindly
10302 		 * without pulling out duplicate stream info. This is
10303 		 * inefficent but won't harm the process since the peer will
10304 		 * look at these in sequence and will thus release anything.
10305 		 * It could mean we exceed the PMTU and chop off some that
10306 		 * we could have included.. but this is unlikely (aka 1432/4
10307 		 * would mean 300+ stream seq's would have to be reported in
10308 		 * one FWD-TSN. With a bit of work we can later FIX this to
10309 		 * optimize and pull out duplcates.. but it does add more
10310 		 * overhead. So for now... not!
10311 		 */
10312 		at = TAILQ_FIRST(&asoc->sent_queue);
10313 		for (i = 0; i < cnt_of_skipped; i++) {
10314 			tp1 = TAILQ_NEXT(at, sctp_next);
10315 			if (tp1 == NULL)
10316 				break;
10317 			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10318 				/* We don't report these */
10319 				i--;
10320 				at = tp1;
10321 				continue;
10322 			}
10323 			if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10324 				at->rec.data.fwd_tsn_cnt = 0;
10325 			}
10326 			strseq->stream = ntohs(at->rec.data.stream_number);
10327 			strseq->sequence = ntohs(at->rec.data.stream_seq);
10328 			strseq++;
10329 			at = tp1;
10330 		}
10331 	}
10332 	return;
10333 }
10334 
10335 void
10336 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10337 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10338     SCTP_UNUSED
10339 #endif
10340 )
10341 {
10342 	/*-
10343 	 * Queue up a SACK or NR-SACK in the control queue.
10344 	 * We must first check to see if a SACK or NR-SACK is
10345 	 * somehow on the control queue.
10346 	 * If so, we will take and and remove the old one.
10347 	 */
10348 	struct sctp_association *asoc;
10349 	struct sctp_tmit_chunk *chk, *a_chk;
10350 	struct sctp_sack_chunk *sack;
10351 	struct sctp_nr_sack_chunk *nr_sack;
10352 	struct sctp_gap_ack_block *gap_descriptor;
10353 	struct sack_track *selector;
10354 	int mergeable = 0;
10355 	int offset;
10356 	caddr_t limit;
10357 	uint32_t *dup;
10358 	int limit_reached = 0;
10359 	unsigned int i, siz, j;
10360 	unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10361 	int num_dups = 0;
10362 	int space_req;
10363 	uint32_t highest_tsn;
10364 	uint8_t flags;
10365 	uint8_t type;
10366 	uint8_t tsn_map;
10367 
10368 	if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10369 	    (stcb->asoc.peer_supports_nr_sack == 1)) {
10370 		type = SCTP_NR_SELECTIVE_ACK;
10371 	} else {
10372 		type = SCTP_SELECTIVE_ACK;
10373 	}
10374 	a_chk = NULL;
10375 	asoc = &stcb->asoc;
10376 	SCTP_TCB_LOCK_ASSERT(stcb);
10377 	if (asoc->last_data_chunk_from == NULL) {
10378 		/* Hmm we never received anything */
10379 		return;
10380 	}
10381 	sctp_slide_mapping_arrays(stcb);
10382 	sctp_set_rwnd(stcb, asoc);
10383 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10384 		if (chk->rec.chunk_id.id == type) {
10385 			/* Hmm, found a sack already on queue, remove it */
10386 			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10387 			asoc->ctrl_queue_cnt--;
10388 			a_chk = chk;
10389 			if (a_chk->data) {
10390 				sctp_m_freem(a_chk->data);
10391 				a_chk->data = NULL;
10392 			}
10393 			if (a_chk->whoTo) {
10394 				sctp_free_remote_addr(a_chk->whoTo);
10395 				a_chk->whoTo = NULL;
10396 			}
10397 			break;
10398 		}
10399 	}
10400 	if (a_chk == NULL) {
10401 		sctp_alloc_a_chunk(stcb, a_chk);
10402 		if (a_chk == NULL) {
10403 			/* No memory so we drop the idea, and set a timer */
10404 			if (stcb->asoc.delayed_ack) {
10405 				sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10406 				    stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10407 				sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10408 				    stcb->sctp_ep, stcb, NULL);
10409 			} else {
10410 				stcb->asoc.send_sack = 1;
10411 			}
10412 			return;
10413 		}
10414 		a_chk->copy_by_ref = 0;
10415 		a_chk->rec.chunk_id.id = type;
10416 		a_chk->rec.chunk_id.can_take_data = 1;
10417 	}
10418 	/* Clear our pkt counts */
10419 	asoc->data_pkts_seen = 0;
10420 
10421 	a_chk->asoc = asoc;
10422 	a_chk->snd_count = 0;
10423 	a_chk->send_size = 0;	/* fill in later */
10424 	a_chk->sent = SCTP_DATAGRAM_UNSENT;
10425 	a_chk->whoTo = NULL;
10426 
10427 	if ((asoc->numduptsns) ||
10428 	    (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10429 		/*-
10430 		 * Ok, we have some duplicates or the destination for the
10431 		 * sack is unreachable, lets see if we can select an
10432 		 * alternate than asoc->last_data_chunk_from
10433 		 */
10434 		if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10435 		    (asoc->used_alt_onsack > asoc->numnets)) {
10436 			/* We used an alt last time, don't this time */
10437 			a_chk->whoTo = NULL;
10438 		} else {
10439 			asoc->used_alt_onsack++;
10440 			a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10441 		}
10442 		if (a_chk->whoTo == NULL) {
10443 			/* Nope, no alternate */
10444 			a_chk->whoTo = asoc->last_data_chunk_from;
10445 			asoc->used_alt_onsack = 0;
10446 		}
10447 	} else {
10448 		/*
10449 		 * No duplicates so we use the last place we received data
10450 		 * from.
10451 		 */
10452 		asoc->used_alt_onsack = 0;
10453 		a_chk->whoTo = asoc->last_data_chunk_from;
10454 	}
10455 	if (a_chk->whoTo) {
10456 		atomic_add_int(&a_chk->whoTo->ref_count, 1);
10457 	}
10458 	if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10459 		highest_tsn = asoc->highest_tsn_inside_map;
10460 	} else {
10461 		highest_tsn = asoc->highest_tsn_inside_nr_map;
10462 	}
10463 	if (highest_tsn == asoc->cumulative_tsn) {
10464 		/* no gaps */
10465 		if (type == SCTP_SELECTIVE_ACK) {
10466 			space_req = sizeof(struct sctp_sack_chunk);
10467 		} else {
10468 			space_req = sizeof(struct sctp_nr_sack_chunk);
10469 		}
10470 	} else {
10471 		/* gaps get a cluster */
10472 		space_req = MCLBYTES;
10473 	}
10474 	/* Ok now lets formulate a MBUF with our sack */
10475 	a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10476 	if ((a_chk->data == NULL) ||
10477 	    (a_chk->whoTo == NULL)) {
10478 		/* rats, no mbuf memory */
10479 		if (a_chk->data) {
10480 			/* was a problem with the destination */
10481 			sctp_m_freem(a_chk->data);
10482 			a_chk->data = NULL;
10483 		}
10484 		sctp_free_a_chunk(stcb, a_chk, so_locked);
10485 		/* sa_ignore NO_NULL_CHK */
10486 		if (stcb->asoc.delayed_ack) {
10487 			sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10488 			    stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10489 			sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10490 			    stcb->sctp_ep, stcb, NULL);
10491 		} else {
10492 			stcb->asoc.send_sack = 1;
10493 		}
10494 		return;
10495 	}
10496 	/* ok, lets go through and fill it in */
10497 	SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10498 	space = M_TRAILINGSPACE(a_chk->data);
10499 	if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10500 		space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10501 	}
10502 	limit = mtod(a_chk->data, caddr_t);
10503 	limit += space;
10504 
10505 	flags = 0;
10506 
10507 	if ((asoc->sctp_cmt_on_off > 0) &&
10508 	    SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10509 		/*-
10510 		 * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10511 		 * received, then set high bit to 1, else 0. Reset
10512 		 * pkts_rcvd.
10513 		 */
10514 		flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10515 		asoc->cmt_dac_pkts_rcvd = 0;
10516 	}
10517 #ifdef SCTP_ASOCLOG_OF_TSNS
10518 	stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10519 	stcb->asoc.cumack_log_atsnt++;
10520 	if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10521 		stcb->asoc.cumack_log_atsnt = 0;
10522 	}
10523 #endif
10524 	/* reset the readers interpretation */
10525 	stcb->freed_by_sorcv_sincelast = 0;
10526 
10527 	if (type == SCTP_SELECTIVE_ACK) {
10528 		sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10529 		nr_sack = NULL;
10530 		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10531 		if (highest_tsn > asoc->mapping_array_base_tsn) {
10532 			siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10533 		} else {
10534 			siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10535 		}
10536 	} else {
10537 		sack = NULL;
10538 		nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10539 		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10540 		if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10541 			siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10542 		} else {
10543 			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10544 		}
10545 	}
10546 
10547 	if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10548 		offset = 1;
10549 	} else {
10550 		offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10551 	}
10552 	if (((type == SCTP_SELECTIVE_ACK) &&
10553 	    SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10554 	    ((type == SCTP_NR_SELECTIVE_ACK) &&
10555 	    SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10556 		/* we have a gap .. maybe */
10557 		for (i = 0; i < siz; i++) {
10558 			tsn_map = asoc->mapping_array[i];
10559 			if (type == SCTP_SELECTIVE_ACK) {
10560 				tsn_map |= asoc->nr_mapping_array[i];
10561 			}
10562 			if (i == 0) {
10563 				/*
10564 				 * Clear all bits corresponding to TSNs
10565 				 * smaller or equal to the cumulative TSN.
10566 				 */
10567 				tsn_map &= (~0 << (1 - offset));
10568 			}
10569 			selector = &sack_array[tsn_map];
10570 			if (mergeable && selector->right_edge) {
10571 				/*
10572 				 * Backup, left and right edges were ok to
10573 				 * merge.
10574 				 */
10575 				num_gap_blocks--;
10576 				gap_descriptor--;
10577 			}
10578 			if (selector->num_entries == 0)
10579 				mergeable = 0;
10580 			else {
10581 				for (j = 0; j < selector->num_entries; j++) {
10582 					if (mergeable && selector->right_edge) {
10583 						/*
10584 						 * do a merge by NOT setting
10585 						 * the left side
10586 						 */
10587 						mergeable = 0;
10588 					} else {
10589 						/*
10590 						 * no merge, set the left
10591 						 * side
10592 						 */
10593 						mergeable = 0;
10594 						gap_descriptor->start = htons((selector->gaps[j].start + offset));
10595 					}
10596 					gap_descriptor->end = htons((selector->gaps[j].end + offset));
10597 					num_gap_blocks++;
10598 					gap_descriptor++;
10599 					if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10600 						/* no more room */
10601 						limit_reached = 1;
10602 						break;
10603 					}
10604 				}
10605 				if (selector->left_edge) {
10606 					mergeable = 1;
10607 				}
10608 			}
10609 			if (limit_reached) {
10610 				/* Reached the limit stop */
10611 				break;
10612 			}
10613 			offset += 8;
10614 		}
10615 	}
10616 	if ((type == SCTP_NR_SELECTIVE_ACK) &&
10617 	    (limit_reached == 0)) {
10618 
10619 		mergeable = 0;
10620 
10621 		if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10622 			siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10623 		} else {
10624 			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10625 		}
10626 
10627 		if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10628 			offset = 1;
10629 		} else {
10630 			offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10631 		}
10632 		if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10633 			/* we have a gap .. maybe */
10634 			for (i = 0; i < siz; i++) {
10635 				tsn_map = asoc->nr_mapping_array[i];
10636 				if (i == 0) {
10637 					/*
10638 					 * Clear all bits corresponding to
10639 					 * TSNs smaller or equal to the
10640 					 * cumulative TSN.
10641 					 */
10642 					tsn_map &= (~0 << (1 - offset));
10643 				}
10644 				selector = &sack_array[tsn_map];
10645 				if (mergeable && selector->right_edge) {
10646 					/*
10647 					 * Backup, left and right edges were
10648 					 * ok to merge.
10649 					 */
10650 					num_nr_gap_blocks--;
10651 					gap_descriptor--;
10652 				}
10653 				if (selector->num_entries == 0)
10654 					mergeable = 0;
10655 				else {
10656 					for (j = 0; j < selector->num_entries; j++) {
10657 						if (mergeable && selector->right_edge) {
10658 							/*
10659 							 * do a merge by NOT
10660 							 * setting the left
10661 							 * side
10662 							 */
10663 							mergeable = 0;
10664 						} else {
10665 							/*
10666 							 * no merge, set the
10667 							 * left side
10668 							 */
10669 							mergeable = 0;
10670 							gap_descriptor->start = htons((selector->gaps[j].start + offset));
10671 						}
10672 						gap_descriptor->end = htons((selector->gaps[j].end + offset));
10673 						num_nr_gap_blocks++;
10674 						gap_descriptor++;
10675 						if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10676 							/* no more room */
10677 							limit_reached = 1;
10678 							break;
10679 						}
10680 					}
10681 					if (selector->left_edge) {
10682 						mergeable = 1;
10683 					}
10684 				}
10685 				if (limit_reached) {
10686 					/* Reached the limit stop */
10687 					break;
10688 				}
10689 				offset += 8;
10690 			}
10691 		}
10692 	}
10693 	/* now we must add any dups we are going to report. */
10694 	if ((limit_reached == 0) && (asoc->numduptsns)) {
10695 		dup = (uint32_t *) gap_descriptor;
10696 		for (i = 0; i < asoc->numduptsns; i++) {
10697 			*dup = htonl(asoc->dup_tsns[i]);
10698 			dup++;
10699 			num_dups++;
10700 			if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10701 				/* no more room */
10702 				break;
10703 			}
10704 		}
10705 		asoc->numduptsns = 0;
10706 	}
10707 	/*
10708 	 * now that the chunk is prepared queue it to the control chunk
10709 	 * queue.
10710 	 */
10711 	if (type == SCTP_SELECTIVE_ACK) {
10712 		a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10713 		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10714 		    num_dups * sizeof(int32_t);
10715 		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10716 		sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10717 		sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10718 		sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10719 		sack->sack.num_dup_tsns = htons(num_dups);
10720 		sack->ch.chunk_type = type;
10721 		sack->ch.chunk_flags = flags;
10722 		sack->ch.chunk_length = htons(a_chk->send_size);
10723 	} else {
10724 		a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10725 		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10726 		    num_dups * sizeof(int32_t);
10727 		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10728 		nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10729 		nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10730 		nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10731 		nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10732 		nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10733 		nr_sack->nr_sack.reserved = 0;
10734 		nr_sack->ch.chunk_type = type;
10735 		nr_sack->ch.chunk_flags = flags;
10736 		nr_sack->ch.chunk_length = htons(a_chk->send_size);
10737 	}
10738 	TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10739 	asoc->my_last_reported_rwnd = asoc->my_rwnd;
10740 	asoc->ctrl_queue_cnt++;
10741 	asoc->send_sack = 0;
10742 	SCTP_STAT_INCR(sctps_sendsacks);
10743 	return;
10744 }
10745 
10746 void
10747 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10748 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10749     SCTP_UNUSED
10750 #endif
10751 )
10752 {
10753 	struct mbuf *m_abort;
10754 	struct mbuf *m_out = NULL, *m_end = NULL;
10755 	struct sctp_abort_chunk *abort = NULL;
10756 	int sz;
10757 	uint32_t auth_offset = 0;
10758 	struct sctp_auth_chunk *auth = NULL;
10759 	struct sctp_nets *net;
10760 
10761 	/*-
10762 	 * Add an AUTH chunk, if chunk requires it and save the offset into
10763 	 * the chain for AUTH
10764 	 */
10765 	if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10766 	    stcb->asoc.peer_auth_chunks)) {
10767 		m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10768 		    stcb, SCTP_ABORT_ASSOCIATION);
10769 		SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10770 	}
10771 	SCTP_TCB_LOCK_ASSERT(stcb);
10772 	m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10773 	if (m_abort == NULL) {
10774 		/* no mbuf's */
10775 		if (m_out)
10776 			sctp_m_freem(m_out);
10777 		return;
10778 	}
10779 	/* link in any error */
10780 	SCTP_BUF_NEXT(m_abort) = operr;
10781 	sz = 0;
10782 	if (operr) {
10783 		struct mbuf *n;
10784 
10785 		n = operr;
10786 		while (n) {
10787 			sz += SCTP_BUF_LEN(n);
10788 			n = SCTP_BUF_NEXT(n);
10789 		}
10790 	}
10791 	SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10792 	if (m_out == NULL) {
10793 		/* NO Auth chunk prepended, so reserve space in front */
10794 		SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10795 		m_out = m_abort;
10796 	} else {
10797 		/* Put AUTH chunk at the front of the chain */
10798 		SCTP_BUF_NEXT(m_end) = m_abort;
10799 	}
10800 	if (stcb->asoc.alternate) {
10801 		net = stcb->asoc.alternate;
10802 	} else {
10803 		net = stcb->asoc.primary_destination;
10804 	}
10805 	/* fill in the ABORT chunk */
10806 	abort = mtod(m_abort, struct sctp_abort_chunk *);
10807 	abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10808 	abort->ch.chunk_flags = 0;
10809 	abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10810 
10811 	(void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10812 	    (struct sockaddr *)&net->ro._l_addr,
10813 	    m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10814 	    stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10815 	    stcb->asoc.primary_destination->port, so_locked, NULL, NULL);
10816 	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10817 }
10818 
10819 void
10820 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10821     struct sctp_nets *net,
10822     int reflect_vtag)
10823 {
10824 	/* formulate and SEND a SHUTDOWN-COMPLETE */
10825 	struct mbuf *m_shutdown_comp;
10826 	struct sctp_shutdown_complete_chunk *shutdown_complete;
10827 	uint32_t vtag;
10828 	uint8_t flags;
10829 
10830 	m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10831 	if (m_shutdown_comp == NULL) {
10832 		/* no mbuf's */
10833 		return;
10834 	}
10835 	if (reflect_vtag) {
10836 		flags = SCTP_HAD_NO_TCB;
10837 		vtag = stcb->asoc.my_vtag;
10838 	} else {
10839 		flags = 0;
10840 		vtag = stcb->asoc.peer_vtag;
10841 	}
10842 	shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10843 	shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10844 	shutdown_complete->ch.chunk_flags = flags;
10845 	shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10846 	SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10847 	(void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10848 	    (struct sockaddr *)&net->ro._l_addr,
10849 	    m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10850 	    stcb->sctp_ep->sctp_lport, stcb->rport,
10851 	    htonl(vtag),
10852 	    net->port, SCTP_SO_NOT_LOCKED, NULL, NULL);
10853 	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10854 	return;
10855 }
10856 
10857 void
10858 sctp_send_shutdown_complete2(struct mbuf *m, struct sctphdr *sh,
10859     uint32_t vrf_id, uint16_t port)
10860 {
10861 	/* formulate and SEND a SHUTDOWN-COMPLETE */
10862 	struct mbuf *o_pak;
10863 	struct mbuf *mout;
10864 	struct ip *iph;
10865 	struct udphdr *udp = NULL;
10866 	int offset_out, len, mlen;
10867 	struct sctp_shutdown_complete_msg *comp_cp;
10868 
10869 #ifdef INET
10870 	struct ip *iph_out;
10871 
10872 #endif
10873 #ifdef INET6
10874 	struct ip6_hdr *ip6, *ip6_out;
10875 
10876 #endif
10877 
10878 	iph = mtod(m, struct ip *);
10879 	switch (iph->ip_v) {
10880 #ifdef INET
10881 	case IPVERSION:
10882 		len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10883 		break;
10884 #endif
10885 #ifdef INET6
10886 	case IPV6_VERSION >> 4:
10887 		len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10888 		break;
10889 #endif
10890 	default:
10891 		return;
10892 	}
10893 	if (port) {
10894 		len += sizeof(struct udphdr);
10895 	}
10896 	mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10897 	if (mout == NULL) {
10898 		return;
10899 	}
10900 	SCTP_BUF_RESV_UF(mout, max_linkhdr);
10901 	SCTP_BUF_LEN(mout) = len;
10902 	SCTP_BUF_NEXT(mout) = NULL;
10903 	if (m->m_flags & M_FLOWID) {
10904 		mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
10905 		mout->m_flags |= M_FLOWID;
10906 	}
10907 #ifdef INET
10908 	iph_out = NULL;
10909 #endif
10910 #ifdef INET6
10911 	ip6_out = NULL;
10912 #endif
10913 	offset_out = 0;
10914 
10915 	switch (iph->ip_v) {
10916 #ifdef INET
10917 	case IPVERSION:
10918 		iph_out = mtod(mout, struct ip *);
10919 
10920 		/* Fill in the IP header for the ABORT */
10921 		iph_out->ip_v = IPVERSION;
10922 		iph_out->ip_hl = (sizeof(struct ip) / 4);
10923 		iph_out->ip_tos = (u_char)0;
10924 		iph_out->ip_id = 0;
10925 		iph_out->ip_off = 0;
10926 		iph_out->ip_ttl = MAXTTL;
10927 		if (port) {
10928 			iph_out->ip_p = IPPROTO_UDP;
10929 		} else {
10930 			iph_out->ip_p = IPPROTO_SCTP;
10931 		}
10932 		iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10933 		iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10934 
10935 		/* let IP layer calculate this */
10936 		iph_out->ip_sum = 0;
10937 		offset_out += sizeof(*iph_out);
10938 		comp_cp = (struct sctp_shutdown_complete_msg *)(
10939 		    (caddr_t)iph_out + offset_out);
10940 		break;
10941 #endif
10942 #ifdef INET6
10943 	case IPV6_VERSION >> 4:
10944 		ip6 = (struct ip6_hdr *)iph;
10945 		ip6_out = mtod(mout, struct ip6_hdr *);
10946 
10947 		/* Fill in the IPv6 header for the ABORT */
10948 		ip6_out->ip6_flow = ip6->ip6_flow;
10949 		ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10950 		if (port) {
10951 			ip6_out->ip6_nxt = IPPROTO_UDP;
10952 		} else {
10953 			ip6_out->ip6_nxt = IPPROTO_SCTP;
10954 		}
10955 		ip6_out->ip6_src = ip6->ip6_dst;
10956 		ip6_out->ip6_dst = ip6->ip6_src;
10957 		/*
10958 		 * ?? The old code had both the iph len + payload, I think
10959 		 * this is wrong and would never have worked
10960 		 */
10961 		ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10962 		offset_out += sizeof(*ip6_out);
10963 		comp_cp = (struct sctp_shutdown_complete_msg *)(
10964 		    (caddr_t)ip6_out + offset_out);
10965 		break;
10966 #endif				/* INET6 */
10967 	default:
10968 		/* Currently not supported. */
10969 		sctp_m_freem(mout);
10970 		return;
10971 	}
10972 	if (port) {
10973 		if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
10974 			sctp_m_freem(mout);
10975 			return;
10976 		}
10977 		udp = (struct udphdr *)comp_cp;
10978 		udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10979 		udp->uh_dport = port;
10980 		udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10981 #ifdef INET
10982 		if (iph_out) {
10983 			if (V_udp_cksum) {
10984 				udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10985 			} else {
10986 				udp->uh_sum = 0;
10987 			}
10988 		}
10989 #endif
10990 		offset_out += sizeof(struct udphdr);
10991 		comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
10992 	}
10993 	if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10994 		/* no mbuf's */
10995 		sctp_m_freem(mout);
10996 		return;
10997 	}
10998 	/* Now copy in and fill in the ABORT tags etc. */
10999 	comp_cp->sh.src_port = sh->dest_port;
11000 	comp_cp->sh.dest_port = sh->src_port;
11001 	comp_cp->sh.checksum = 0;
11002 	comp_cp->sh.v_tag = sh->v_tag;
11003 	comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
11004 	comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11005 	comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11006 
11007 #ifdef INET
11008 	if (iph_out != NULL) {
11009 		sctp_route_t ro;
11010 		int ret;
11011 
11012 		mlen = SCTP_BUF_LEN(mout);
11013 		bzero(&ro, sizeof ro);
11014 		/* set IPv4 length */
11015 		iph_out->ip_len = mlen;
11016 #ifdef  SCTP_PACKET_LOGGING
11017 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11018 			sctp_packet_log(mout, mlen);
11019 #endif
11020 		if (port) {
11021 #if defined(SCTP_WITH_NO_CSUM)
11022 			SCTP_STAT_INCR(sctps_sendnocrc);
11023 #else
11024 			comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
11025 			SCTP_STAT_INCR(sctps_sendswcrc);
11026 #endif
11027 			if (V_udp_cksum) {
11028 				SCTP_ENABLE_UDP_CSUM(mout);
11029 			}
11030 		} else {
11031 #if defined(SCTP_WITH_NO_CSUM)
11032 			SCTP_STAT_INCR(sctps_sendnocrc);
11033 #else
11034 			mout->m_pkthdr.csum_flags = CSUM_SCTP;
11035 			mout->m_pkthdr.csum_data = 0;
11036 			SCTP_STAT_INCR(sctps_sendhwcrc);
11037 #endif
11038 		}
11039 		SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
11040 		/* out it goes */
11041 		SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11042 
11043 		/* Free the route if we got one back */
11044 		if (ro.ro_rt)
11045 			RTFREE(ro.ro_rt);
11046 	}
11047 #endif
11048 #ifdef INET6
11049 	if (ip6_out != NULL) {
11050 		struct route_in6 ro;
11051 		int ret;
11052 		struct ifnet *ifp = NULL;
11053 
11054 		bzero(&ro, sizeof(ro));
11055 		mlen = SCTP_BUF_LEN(mout);
11056 #ifdef  SCTP_PACKET_LOGGING
11057 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11058 			sctp_packet_log(mout, mlen);
11059 #endif
11060 		SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
11061 		if (port) {
11062 #if defined(SCTP_WITH_NO_CSUM)
11063 			SCTP_STAT_INCR(sctps_sendnocrc);
11064 #else
11065 			comp_cp->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11066 			SCTP_STAT_INCR(sctps_sendswcrc);
11067 #endif
11068 			if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), mlen - sizeof(struct ip6_hdr))) == 0) {
11069 				udp->uh_sum = 0xffff;
11070 			}
11071 		} else {
11072 #if defined(SCTP_WITH_NO_CSUM)
11073 			SCTP_STAT_INCR(sctps_sendnocrc);
11074 #else
11075 			mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11076 			mout->m_pkthdr.csum_data = 0;
11077 			SCTP_STAT_INCR(sctps_sendhwcrc);
11078 #endif
11079 		}
11080 		SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
11081 
11082 		/* Free the route if we got one back */
11083 		if (ro.ro_rt)
11084 			RTFREE(ro.ro_rt);
11085 	}
11086 #endif
11087 	SCTP_STAT_INCR(sctps_sendpackets);
11088 	SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11089 	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11090 	return;
11091 
11092 }
11093 
11094 void
11095 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11096 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11097     SCTP_UNUSED
11098 #endif
11099 )
11100 {
11101 	struct sctp_tmit_chunk *chk;
11102 	struct sctp_heartbeat_chunk *hb;
11103 	struct timeval now;
11104 
11105 	SCTP_TCB_LOCK_ASSERT(stcb);
11106 	if (net == NULL) {
11107 		return;
11108 	}
11109 	(void)SCTP_GETTIME_TIMEVAL(&now);
11110 	switch (net->ro._l_addr.sa.sa_family) {
11111 #ifdef INET
11112 	case AF_INET:
11113 		break;
11114 #endif
11115 #ifdef INET6
11116 	case AF_INET6:
11117 		break;
11118 #endif
11119 	default:
11120 		return;
11121 	}
11122 	sctp_alloc_a_chunk(stcb, chk);
11123 	if (chk == NULL) {
11124 		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11125 		return;
11126 	}
11127 	chk->copy_by_ref = 0;
11128 	chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11129 	chk->rec.chunk_id.can_take_data = 1;
11130 	chk->asoc = &stcb->asoc;
11131 	chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11132 
11133 	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11134 	if (chk->data == NULL) {
11135 		sctp_free_a_chunk(stcb, chk, so_locked);
11136 		return;
11137 	}
11138 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11139 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11140 	chk->sent = SCTP_DATAGRAM_UNSENT;
11141 	chk->snd_count = 0;
11142 	chk->whoTo = net;
11143 	atomic_add_int(&chk->whoTo->ref_count, 1);
11144 	/* Now we have a mbuf that we can fill in with the details */
11145 	hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11146 	memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11147 	/* fill out chunk header */
11148 	hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11149 	hb->ch.chunk_flags = 0;
11150 	hb->ch.chunk_length = htons(chk->send_size);
11151 	/* Fill out hb parameter */
11152 	hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11153 	hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11154 	hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11155 	hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11156 	/* Did our user request this one, put it in */
11157 	hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11158 	hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11159 	if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11160 		/*
11161 		 * we only take from the entropy pool if the address is not
11162 		 * confirmed.
11163 		 */
11164 		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11165 		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11166 	} else {
11167 		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11168 		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11169 	}
11170 	switch (net->ro._l_addr.sa.sa_family) {
11171 #ifdef INET
11172 	case AF_INET:
11173 		memcpy(hb->heartbeat.hb_info.address,
11174 		    &net->ro._l_addr.sin.sin_addr,
11175 		    sizeof(net->ro._l_addr.sin.sin_addr));
11176 		break;
11177 #endif
11178 #ifdef INET6
11179 	case AF_INET6:
11180 		memcpy(hb->heartbeat.hb_info.address,
11181 		    &net->ro._l_addr.sin6.sin6_addr,
11182 		    sizeof(net->ro._l_addr.sin6.sin6_addr));
11183 		break;
11184 #endif
11185 	default:
11186 		return;
11187 		break;
11188 	}
11189 	net->hb_responded = 0;
11190 	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11191 	stcb->asoc.ctrl_queue_cnt++;
11192 	SCTP_STAT_INCR(sctps_sendheartbeat);
11193 	return;
11194 }
11195 
11196 void
11197 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11198     uint32_t high_tsn)
11199 {
11200 	struct sctp_association *asoc;
11201 	struct sctp_ecne_chunk *ecne;
11202 	struct sctp_tmit_chunk *chk;
11203 
11204 	if (net == NULL) {
11205 		return;
11206 	}
11207 	asoc = &stcb->asoc;
11208 	SCTP_TCB_LOCK_ASSERT(stcb);
11209 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11210 		if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11211 			/* found a previous ECN_ECHO update it if needed */
11212 			uint32_t cnt, ctsn;
11213 
11214 			ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11215 			ctsn = ntohl(ecne->tsn);
11216 			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11217 				ecne->tsn = htonl(high_tsn);
11218 				SCTP_STAT_INCR(sctps_queue_upd_ecne);
11219 			}
11220 			cnt = ntohl(ecne->num_pkts_since_cwr);
11221 			cnt++;
11222 			ecne->num_pkts_since_cwr = htonl(cnt);
11223 			return;
11224 		}
11225 	}
11226 	/* nope could not find one to update so we must build one */
11227 	sctp_alloc_a_chunk(stcb, chk);
11228 	if (chk == NULL) {
11229 		return;
11230 	}
11231 	chk->copy_by_ref = 0;
11232 	SCTP_STAT_INCR(sctps_queue_upd_ecne);
11233 	chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11234 	chk->rec.chunk_id.can_take_data = 0;
11235 	chk->asoc = &stcb->asoc;
11236 	chk->send_size = sizeof(struct sctp_ecne_chunk);
11237 	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11238 	if (chk->data == NULL) {
11239 		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11240 		return;
11241 	}
11242 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11243 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11244 	chk->sent = SCTP_DATAGRAM_UNSENT;
11245 	chk->snd_count = 0;
11246 	chk->whoTo = net;
11247 	atomic_add_int(&chk->whoTo->ref_count, 1);
11248 
11249 	stcb->asoc.ecn_echo_cnt_onq++;
11250 	ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11251 	ecne->ch.chunk_type = SCTP_ECN_ECHO;
11252 	ecne->ch.chunk_flags = 0;
11253 	ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11254 	ecne->tsn = htonl(high_tsn);
11255 	ecne->num_pkts_since_cwr = htonl(1);
11256 	TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11257 	asoc->ctrl_queue_cnt++;
11258 }
11259 
11260 void
11261 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11262     struct mbuf *m, int iphlen, int bad_crc)
11263 {
11264 	struct sctp_association *asoc;
11265 	struct sctp_pktdrop_chunk *drp;
11266 	struct sctp_tmit_chunk *chk;
11267 	uint8_t *datap;
11268 	int len;
11269 	int was_trunc = 0;
11270 	struct ip *iph;
11271 
11272 #ifdef INET6
11273 	struct ip6_hdr *ip6h;
11274 
11275 #endif
11276 	int fullsz = 0, extra = 0;
11277 	long spc;
11278 	int offset;
11279 	struct sctp_chunkhdr *ch, chunk_buf;
11280 	unsigned int chk_length;
11281 
11282 	if (!stcb) {
11283 		return;
11284 	}
11285 	asoc = &stcb->asoc;
11286 	SCTP_TCB_LOCK_ASSERT(stcb);
11287 	if (asoc->peer_supports_pktdrop == 0) {
11288 		/*-
11289 		 * peer must declare support before I send one.
11290 		 */
11291 		return;
11292 	}
11293 	if (stcb->sctp_socket == NULL) {
11294 		return;
11295 	}
11296 	sctp_alloc_a_chunk(stcb, chk);
11297 	if (chk == NULL) {
11298 		return;
11299 	}
11300 	chk->copy_by_ref = 0;
11301 	iph = mtod(m, struct ip *);
11302 	if (iph == NULL) {
11303 		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11304 		return;
11305 	}
11306 	switch (iph->ip_v) {
11307 #ifdef INET
11308 	case IPVERSION:
11309 		/* IPv4 */
11310 		len = chk->send_size = iph->ip_len;
11311 		break;
11312 #endif
11313 #ifdef INET6
11314 	case IPV6_VERSION >> 4:
11315 		/* IPv6 */
11316 		ip6h = mtod(m, struct ip6_hdr *);
11317 		len = chk->send_size = htons(ip6h->ip6_plen);
11318 		break;
11319 #endif
11320 	default:
11321 		return;
11322 	}
11323 	/* Validate that we do not have an ABORT in here. */
11324 	offset = iphlen + sizeof(struct sctphdr);
11325 	ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11326 	    sizeof(*ch), (uint8_t *) & chunk_buf);
11327 	while (ch != NULL) {
11328 		chk_length = ntohs(ch->chunk_length);
11329 		if (chk_length < sizeof(*ch)) {
11330 			/* break to abort land */
11331 			break;
11332 		}
11333 		switch (ch->chunk_type) {
11334 		case SCTP_PACKET_DROPPED:
11335 		case SCTP_ABORT_ASSOCIATION:
11336 		case SCTP_INITIATION_ACK:
11337 			/**
11338 			 * We don't respond with an PKT-DROP to an ABORT
11339 			 * or PKT-DROP. We also do not respond to an
11340 			 * INIT-ACK, because we can't know if the initiation
11341 			 * tag is correct or not.
11342 			 */
11343 			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11344 			return;
11345 		default:
11346 			break;
11347 		}
11348 		offset += SCTP_SIZE32(chk_length);
11349 		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11350 		    sizeof(*ch), (uint8_t *) & chunk_buf);
11351 	}
11352 
11353 	if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11354 	    min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11355 		/*
11356 		 * only send 1 mtu worth, trim off the excess on the end.
11357 		 */
11358 		fullsz = len - extra;
11359 		len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11360 		was_trunc = 1;
11361 	}
11362 	chk->asoc = &stcb->asoc;
11363 	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11364 	if (chk->data == NULL) {
11365 jump_out:
11366 		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11367 		return;
11368 	}
11369 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11370 	drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11371 	if (drp == NULL) {
11372 		sctp_m_freem(chk->data);
11373 		chk->data = NULL;
11374 		goto jump_out;
11375 	}
11376 	chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11377 	    sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11378 	chk->book_size_scale = 0;
11379 	if (was_trunc) {
11380 		drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11381 		drp->trunc_len = htons(fullsz);
11382 		/*
11383 		 * Len is already adjusted to size minus overhead above take
11384 		 * out the pkt_drop chunk itself from it.
11385 		 */
11386 		chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11387 		len = chk->send_size;
11388 	} else {
11389 		/* no truncation needed */
11390 		drp->ch.chunk_flags = 0;
11391 		drp->trunc_len = htons(0);
11392 	}
11393 	if (bad_crc) {
11394 		drp->ch.chunk_flags |= SCTP_BADCRC;
11395 	}
11396 	chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11397 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11398 	chk->sent = SCTP_DATAGRAM_UNSENT;
11399 	chk->snd_count = 0;
11400 	if (net) {
11401 		/* we should hit here */
11402 		chk->whoTo = net;
11403 		atomic_add_int(&chk->whoTo->ref_count, 1);
11404 	} else {
11405 		chk->whoTo = NULL;
11406 	}
11407 	chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11408 	chk->rec.chunk_id.can_take_data = 1;
11409 	drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11410 	drp->ch.chunk_length = htons(chk->send_size);
11411 	spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11412 	if (spc < 0) {
11413 		spc = 0;
11414 	}
11415 	drp->bottle_bw = htonl(spc);
11416 	if (asoc->my_rwnd) {
11417 		drp->current_onq = htonl(asoc->size_on_reasm_queue +
11418 		    asoc->size_on_all_streams +
11419 		    asoc->my_rwnd_control_len +
11420 		    stcb->sctp_socket->so_rcv.sb_cc);
11421 	} else {
11422 		/*-
11423 		 * If my rwnd is 0, possibly from mbuf depletion as well as
11424 		 * space used, tell the peer there is NO space aka onq == bw
11425 		 */
11426 		drp->current_onq = htonl(spc);
11427 	}
11428 	drp->reserved = 0;
11429 	datap = drp->data;
11430 	m_copydata(m, iphlen, len, (caddr_t)datap);
11431 	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11432 	asoc->ctrl_queue_cnt++;
11433 }
11434 
11435 void
11436 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11437 {
11438 	struct sctp_association *asoc;
11439 	struct sctp_cwr_chunk *cwr;
11440 	struct sctp_tmit_chunk *chk;
11441 
11442 	asoc = &stcb->asoc;
11443 	SCTP_TCB_LOCK_ASSERT(stcb);
11444 	if (net == NULL) {
11445 		return;
11446 	}
11447 	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11448 		if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11449 			/*
11450 			 * found a previous CWR queued to same destination
11451 			 * update it if needed
11452 			 */
11453 			uint32_t ctsn;
11454 
11455 			cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11456 			ctsn = ntohl(cwr->tsn);
11457 			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11458 				cwr->tsn = htonl(high_tsn);
11459 			}
11460 			if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11461 				/* Make sure override is carried */
11462 				cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11463 			}
11464 			return;
11465 		}
11466 	}
11467 	sctp_alloc_a_chunk(stcb, chk);
11468 	if (chk == NULL) {
11469 		return;
11470 	}
11471 	chk->copy_by_ref = 0;
11472 	chk->rec.chunk_id.id = SCTP_ECN_CWR;
11473 	chk->rec.chunk_id.can_take_data = 1;
11474 	chk->asoc = &stcb->asoc;
11475 	chk->send_size = sizeof(struct sctp_cwr_chunk);
11476 	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11477 	if (chk->data == NULL) {
11478 		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11479 		return;
11480 	}
11481 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11482 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11483 	chk->sent = SCTP_DATAGRAM_UNSENT;
11484 	chk->snd_count = 0;
11485 	chk->whoTo = net;
11486 	atomic_add_int(&chk->whoTo->ref_count, 1);
11487 	cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11488 	cwr->ch.chunk_type = SCTP_ECN_CWR;
11489 	cwr->ch.chunk_flags = override;
11490 	cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11491 	cwr->tsn = htonl(high_tsn);
11492 	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11493 	asoc->ctrl_queue_cnt++;
11494 }
11495 
11496 void
11497 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11498     int number_entries, uint16_t * list,
11499     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11500 {
11501 	int len, old_len, i;
11502 	struct sctp_stream_reset_out_request *req_out;
11503 	struct sctp_chunkhdr *ch;
11504 
11505 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11506 
11507 
11508 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11509 
11510 	/* get to new offset for the param. */
11511 	req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11512 	/* now how long will this param be? */
11513 	len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11514 	req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11515 	req_out->ph.param_length = htons(len);
11516 	req_out->request_seq = htonl(seq);
11517 	req_out->response_seq = htonl(resp_seq);
11518 	req_out->send_reset_at_tsn = htonl(last_sent);
11519 	if (number_entries) {
11520 		for (i = 0; i < number_entries; i++) {
11521 			req_out->list_of_streams[i] = htons(list[i]);
11522 		}
11523 	}
11524 	if (SCTP_SIZE32(len) > len) {
11525 		/*-
11526 		 * Need to worry about the pad we may end up adding to the
11527 		 * end. This is easy since the struct is either aligned to 4
11528 		 * bytes or 2 bytes off.
11529 		 */
11530 		req_out->list_of_streams[number_entries] = 0;
11531 	}
11532 	/* now fix the chunk length */
11533 	ch->chunk_length = htons(len + old_len);
11534 	chk->book_size = len + old_len;
11535 	chk->book_size_scale = 0;
11536 	chk->send_size = SCTP_SIZE32(chk->book_size);
11537 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11538 	return;
11539 }
11540 
11541 
11542 void
11543 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11544     int number_entries, uint16_t * list,
11545     uint32_t seq)
11546 {
11547 	int len, old_len, i;
11548 	struct sctp_stream_reset_in_request *req_in;
11549 	struct sctp_chunkhdr *ch;
11550 
11551 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11552 
11553 
11554 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11555 
11556 	/* get to new offset for the param. */
11557 	req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11558 	/* now how long will this param be? */
11559 	len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11560 	req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11561 	req_in->ph.param_length = htons(len);
11562 	req_in->request_seq = htonl(seq);
11563 	if (number_entries) {
11564 		for (i = 0; i < number_entries; i++) {
11565 			req_in->list_of_streams[i] = htons(list[i]);
11566 		}
11567 	}
11568 	if (SCTP_SIZE32(len) > len) {
11569 		/*-
11570 		 * Need to worry about the pad we may end up adding to the
11571 		 * end. This is easy since the struct is either aligned to 4
11572 		 * bytes or 2 bytes off.
11573 		 */
11574 		req_in->list_of_streams[number_entries] = 0;
11575 	}
11576 	/* now fix the chunk length */
11577 	ch->chunk_length = htons(len + old_len);
11578 	chk->book_size = len + old_len;
11579 	chk->book_size_scale = 0;
11580 	chk->send_size = SCTP_SIZE32(chk->book_size);
11581 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11582 	return;
11583 }
11584 
11585 
11586 void
11587 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11588     uint32_t seq)
11589 {
11590 	int len, old_len;
11591 	struct sctp_stream_reset_tsn_request *req_tsn;
11592 	struct sctp_chunkhdr *ch;
11593 
11594 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11595 
11596 
11597 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11598 
11599 	/* get to new offset for the param. */
11600 	req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11601 	/* now how long will this param be? */
11602 	len = sizeof(struct sctp_stream_reset_tsn_request);
11603 	req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11604 	req_tsn->ph.param_length = htons(len);
11605 	req_tsn->request_seq = htonl(seq);
11606 
11607 	/* now fix the chunk length */
11608 	ch->chunk_length = htons(len + old_len);
11609 	chk->send_size = len + old_len;
11610 	chk->book_size = SCTP_SIZE32(chk->send_size);
11611 	chk->book_size_scale = 0;
11612 	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11613 	return;
11614 }
11615 
11616 void
11617 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11618     uint32_t resp_seq, uint32_t result)
11619 {
11620 	int len, old_len;
11621 	struct sctp_stream_reset_response *resp;
11622 	struct sctp_chunkhdr *ch;
11623 
11624 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11625 
11626 
11627 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11628 
11629 	/* get to new offset for the param. */
11630 	resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11631 	/* now how long will this param be? */
11632 	len = sizeof(struct sctp_stream_reset_response);
11633 	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11634 	resp->ph.param_length = htons(len);
11635 	resp->response_seq = htonl(resp_seq);
11636 	resp->result = ntohl(result);
11637 
11638 	/* now fix the chunk length */
11639 	ch->chunk_length = htons(len + old_len);
11640 	chk->book_size = len + old_len;
11641 	chk->book_size_scale = 0;
11642 	chk->send_size = SCTP_SIZE32(chk->book_size);
11643 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11644 	return;
11645 
11646 }
11647 
11648 
11649 void
11650 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11651     uint32_t resp_seq, uint32_t result,
11652     uint32_t send_una, uint32_t recv_next)
11653 {
11654 	int len, old_len;
11655 	struct sctp_stream_reset_response_tsn *resp;
11656 	struct sctp_chunkhdr *ch;
11657 
11658 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11659 
11660 
11661 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11662 
11663 	/* get to new offset for the param. */
11664 	resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11665 	/* now how long will this param be? */
11666 	len = sizeof(struct sctp_stream_reset_response_tsn);
11667 	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11668 	resp->ph.param_length = htons(len);
11669 	resp->response_seq = htonl(resp_seq);
11670 	resp->result = htonl(result);
11671 	resp->senders_next_tsn = htonl(send_una);
11672 	resp->receivers_next_tsn = htonl(recv_next);
11673 
11674 	/* now fix the chunk length */
11675 	ch->chunk_length = htons(len + old_len);
11676 	chk->book_size = len + old_len;
11677 	chk->send_size = SCTP_SIZE32(chk->book_size);
11678 	chk->book_size_scale = 0;
11679 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11680 	return;
11681 }
11682 
11683 static void
11684 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11685     uint32_t seq,
11686     uint16_t adding)
11687 {
11688 	int len, old_len;
11689 	struct sctp_chunkhdr *ch;
11690 	struct sctp_stream_reset_add_strm *addstr;
11691 
11692 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11693 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11694 
11695 	/* get to new offset for the param. */
11696 	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11697 	/* now how long will this param be? */
11698 	len = sizeof(struct sctp_stream_reset_add_strm);
11699 
11700 	/* Fill it out. */
11701 	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11702 	addstr->ph.param_length = htons(len);
11703 	addstr->request_seq = htonl(seq);
11704 	addstr->number_of_streams = htons(adding);
11705 	addstr->reserved = 0;
11706 
11707 	/* now fix the chunk length */
11708 	ch->chunk_length = htons(len + old_len);
11709 	chk->send_size = len + old_len;
11710 	chk->book_size = SCTP_SIZE32(chk->send_size);
11711 	chk->book_size_scale = 0;
11712 	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11713 	return;
11714 }
11715 
11716 static void
11717 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11718     uint32_t seq,
11719     uint16_t adding)
11720 {
11721 	int len, old_len;
11722 	struct sctp_chunkhdr *ch;
11723 	struct sctp_stream_reset_add_strm *addstr;
11724 
11725 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11726 	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11727 
11728 	/* get to new offset for the param. */
11729 	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11730 	/* now how long will this param be? */
11731 	len = sizeof(struct sctp_stream_reset_add_strm);
11732 	/* Fill it out. */
11733 	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11734 	addstr->ph.param_length = htons(len);
11735 	addstr->request_seq = htonl(seq);
11736 	addstr->number_of_streams = htons(adding);
11737 	addstr->reserved = 0;
11738 
11739 	/* now fix the chunk length */
11740 	ch->chunk_length = htons(len + old_len);
11741 	chk->send_size = len + old_len;
11742 	chk->book_size = SCTP_SIZE32(chk->send_size);
11743 	chk->book_size_scale = 0;
11744 	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11745 	return;
11746 }
11747 
11748 
11749 
11750 int
11751 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11752     int number_entries, uint16_t * list,
11753     uint8_t send_out_req,
11754     uint8_t send_in_req,
11755     uint8_t send_tsn_req,
11756     uint8_t add_stream,
11757     uint16_t adding_o,
11758     uint16_t adding_i, uint8_t peer_asked
11759 )
11760 {
11761 
11762 	struct sctp_association *asoc;
11763 	struct sctp_tmit_chunk *chk;
11764 	struct sctp_chunkhdr *ch;
11765 	uint32_t seq;
11766 
11767 	asoc = &stcb->asoc;
11768 	if (asoc->stream_reset_outstanding) {
11769 		/*-
11770 		 * Already one pending, must get ACK back to clear the flag.
11771 		 */
11772 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11773 		return (EBUSY);
11774 	}
11775 	if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11776 	    (add_stream == 0)) {
11777 		/* nothing to do */
11778 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11779 		return (EINVAL);
11780 	}
11781 	if (send_tsn_req && (send_out_req || send_in_req)) {
11782 		/* error, can't do that */
11783 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11784 		return (EINVAL);
11785 	}
11786 	sctp_alloc_a_chunk(stcb, chk);
11787 	if (chk == NULL) {
11788 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11789 		return (ENOMEM);
11790 	}
11791 	chk->copy_by_ref = 0;
11792 	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11793 	chk->rec.chunk_id.can_take_data = 0;
11794 	chk->asoc = &stcb->asoc;
11795 	chk->book_size = sizeof(struct sctp_chunkhdr);
11796 	chk->send_size = SCTP_SIZE32(chk->book_size);
11797 	chk->book_size_scale = 0;
11798 
11799 	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11800 	if (chk->data == NULL) {
11801 		sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11802 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11803 		return (ENOMEM);
11804 	}
11805 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11806 
11807 	/* setup chunk parameters */
11808 	chk->sent = SCTP_DATAGRAM_UNSENT;
11809 	chk->snd_count = 0;
11810 	if (stcb->asoc.alternate) {
11811 		chk->whoTo = stcb->asoc.alternate;
11812 	} else {
11813 		chk->whoTo = stcb->asoc.primary_destination;
11814 	}
11815 	atomic_add_int(&chk->whoTo->ref_count, 1);
11816 	ch = mtod(chk->data, struct sctp_chunkhdr *);
11817 	ch->chunk_type = SCTP_STREAM_RESET;
11818 	ch->chunk_flags = 0;
11819 	ch->chunk_length = htons(chk->book_size);
11820 	SCTP_BUF_LEN(chk->data) = chk->send_size;
11821 
11822 	seq = stcb->asoc.str_reset_seq_out;
11823 	if (send_out_req) {
11824 		sctp_add_stream_reset_out(chk, number_entries, list,
11825 		    seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11826 		asoc->stream_reset_out_is_outstanding = 1;
11827 		seq++;
11828 		asoc->stream_reset_outstanding++;
11829 	}
11830 	if ((add_stream & 1) &&
11831 	    ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11832 		/* Need to allocate more */
11833 		struct sctp_stream_out *oldstream;
11834 		struct sctp_stream_queue_pending *sp, *nsp;
11835 		int i;
11836 
11837 		oldstream = stcb->asoc.strmout;
11838 		/* get some more */
11839 		SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11840 		    ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11841 		    SCTP_M_STRMO);
11842 		if (stcb->asoc.strmout == NULL) {
11843 			uint8_t x;
11844 
11845 			stcb->asoc.strmout = oldstream;
11846 			/* Turn off the bit */
11847 			x = add_stream & 0xfe;
11848 			add_stream = x;
11849 			goto skip_stuff;
11850 		}
11851 		/*
11852 		 * Ok now we proceed with copying the old out stuff and
11853 		 * initializing the new stuff.
11854 		 */
11855 		SCTP_TCB_SEND_LOCK(stcb);
11856 		stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11857 		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11858 			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11859 			stcb->asoc.strmout[i].next_sequence_sent = oldstream[i].next_sequence_sent;
11860 			stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11861 			stcb->asoc.strmout[i].stream_no = i;
11862 			stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11863 			/* now anything on those queues? */
11864 			TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11865 				TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11866 				TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11867 			}
11868 			/* Now move assoc pointers too */
11869 			if (stcb->asoc.last_out_stream == &oldstream[i]) {
11870 				stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11871 			}
11872 			if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11873 				stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11874 			}
11875 		}
11876 		/* now the new streams */
11877 		stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11878 		for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11879 			stcb->asoc.strmout[i].next_sequence_sent = 0x0;
11880 			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11881 			stcb->asoc.strmout[i].stream_no = i;
11882 			stcb->asoc.strmout[i].last_msg_incomplete = 0;
11883 			stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11884 		}
11885 		stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11886 		SCTP_FREE(oldstream, SCTP_M_STRMO);
11887 		SCTP_TCB_SEND_UNLOCK(stcb);
11888 	}
11889 skip_stuff:
11890 	if ((add_stream & 1) && (adding_o > 0)) {
11891 		asoc->strm_pending_add_size = adding_o;
11892 		asoc->peer_req_out = peer_asked;
11893 		sctp_add_an_out_stream(chk, seq, adding_o);
11894 		seq++;
11895 		asoc->stream_reset_outstanding++;
11896 	}
11897 	if ((add_stream & 2) && (adding_i > 0)) {
11898 		sctp_add_an_in_stream(chk, seq, adding_i);
11899 		seq++;
11900 		asoc->stream_reset_outstanding++;
11901 	}
11902 	if (send_in_req) {
11903 		sctp_add_stream_reset_in(chk, number_entries, list, seq);
11904 		seq++;
11905 		asoc->stream_reset_outstanding++;
11906 	}
11907 	if (send_tsn_req) {
11908 		sctp_add_stream_reset_tsn(chk, seq);
11909 		asoc->stream_reset_outstanding++;
11910 	}
11911 	asoc->str_reset = chk;
11912 	/* insert the chunk for sending */
11913 	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11914 	    chk,
11915 	    sctp_next);
11916 	asoc->ctrl_queue_cnt++;
11917 	sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11918 	return (0);
11919 }
11920 
11921 void
11922 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11923     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11924 {
11925 	/*-
11926 	 * Formulate the abort message, and send it back down.
11927 	 */
11928 	struct mbuf *o_pak;
11929 	struct mbuf *mout;
11930 	struct sctp_abort_msg *abm;
11931 	struct ip *iph;
11932 	struct udphdr *udp;
11933 	int iphlen_out, len;
11934 
11935 #ifdef INET
11936 	struct ip *iph_out;
11937 
11938 #endif
11939 #ifdef INET6
11940 	struct ip6_hdr *ip6, *ip6_out;
11941 
11942 #endif
11943 
11944 	/* don't respond to ABORT with ABORT */
11945 	if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11946 		if (err_cause)
11947 			sctp_m_freem(err_cause);
11948 		return;
11949 	}
11950 	iph = mtod(m, struct ip *);
11951 	switch (iph->ip_v) {
11952 #ifdef INET
11953 	case IPVERSION:
11954 		len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11955 		break;
11956 #endif
11957 #ifdef INET6
11958 	case IPV6_VERSION >> 4:
11959 		len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11960 		break;
11961 #endif
11962 	default:
11963 		if (err_cause) {
11964 			sctp_m_freem(err_cause);
11965 		}
11966 		return;
11967 	}
11968 	if (port) {
11969 		len += sizeof(struct udphdr);
11970 	}
11971 	mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11972 	if (mout == NULL) {
11973 		if (err_cause) {
11974 			sctp_m_freem(err_cause);
11975 		}
11976 		return;
11977 	}
11978 	SCTP_BUF_RESV_UF(mout, max_linkhdr);
11979 	SCTP_BUF_LEN(mout) = len;
11980 	SCTP_BUF_NEXT(mout) = err_cause;
11981 	if (m->m_flags & M_FLOWID) {
11982 		mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
11983 		mout->m_flags |= M_FLOWID;
11984 	}
11985 #ifdef INET
11986 	iph_out = NULL;
11987 #endif
11988 #ifdef INET6
11989 	ip6_out = NULL;
11990 #endif
11991 	switch (iph->ip_v) {
11992 #ifdef INET
11993 	case IPVERSION:
11994 		iph_out = mtod(mout, struct ip *);
11995 
11996 		/* Fill in the IP header for the ABORT */
11997 		iph_out->ip_v = IPVERSION;
11998 		iph_out->ip_hl = (sizeof(struct ip) / 4);
11999 		iph_out->ip_tos = (u_char)0;
12000 		iph_out->ip_id = 0;
12001 		iph_out->ip_off = 0;
12002 		iph_out->ip_ttl = MAXTTL;
12003 		if (port) {
12004 			iph_out->ip_p = IPPROTO_UDP;
12005 		} else {
12006 			iph_out->ip_p = IPPROTO_SCTP;
12007 		}
12008 		iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
12009 		iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
12010 		/* let IP layer calculate this */
12011 		iph_out->ip_sum = 0;
12012 
12013 		iphlen_out = sizeof(*iph_out);
12014 		abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
12015 		break;
12016 #endif
12017 #ifdef INET6
12018 	case IPV6_VERSION >> 4:
12019 		ip6 = (struct ip6_hdr *)iph;
12020 		ip6_out = mtod(mout, struct ip6_hdr *);
12021 
12022 		/* Fill in the IP6 header for the ABORT */
12023 		ip6_out->ip6_flow = ip6->ip6_flow;
12024 		ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
12025 		if (port) {
12026 			ip6_out->ip6_nxt = IPPROTO_UDP;
12027 		} else {
12028 			ip6_out->ip6_nxt = IPPROTO_SCTP;
12029 		}
12030 		ip6_out->ip6_src = ip6->ip6_dst;
12031 		ip6_out->ip6_dst = ip6->ip6_src;
12032 
12033 		iphlen_out = sizeof(*ip6_out);
12034 		abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
12035 		break;
12036 #endif				/* INET6 */
12037 	default:
12038 		/* Currently not supported */
12039 		sctp_m_freem(mout);
12040 		return;
12041 	}
12042 
12043 	udp = (struct udphdr *)abm;
12044 	if (port) {
12045 		if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
12046 			sctp_m_freem(mout);
12047 			return;
12048 		}
12049 		udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
12050 		udp->uh_dport = port;
12051 		/* set udp->uh_ulen later */
12052 		udp->uh_sum = 0;
12053 		iphlen_out += sizeof(struct udphdr);
12054 		abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
12055 	}
12056 	abm->sh.src_port = sh->dest_port;
12057 	abm->sh.dest_port = sh->src_port;
12058 	abm->sh.checksum = 0;
12059 	if (vtag == 0) {
12060 		abm->sh.v_tag = sh->v_tag;
12061 		abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
12062 	} else {
12063 		abm->sh.v_tag = htonl(vtag);
12064 		abm->msg.ch.chunk_flags = 0;
12065 	}
12066 	abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
12067 
12068 	if (err_cause) {
12069 		struct mbuf *m_tmp = err_cause;
12070 		int err_len = 0;
12071 
12072 		/* get length of the err_cause chain */
12073 		while (m_tmp != NULL) {
12074 			err_len += SCTP_BUF_LEN(m_tmp);
12075 			m_tmp = SCTP_BUF_NEXT(m_tmp);
12076 		}
12077 		len = SCTP_BUF_LEN(mout) + err_len;
12078 		if (err_len % 4) {
12079 			/* need pad at end of chunk */
12080 			uint32_t cpthis = 0;
12081 			int padlen;
12082 
12083 			padlen = 4 - (len % 4);
12084 			m_copyback(mout, len, padlen, (caddr_t)&cpthis);
12085 			len += padlen;
12086 		}
12087 		abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
12088 	} else {
12089 		len = SCTP_BUF_LEN(mout);
12090 		abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
12091 	}
12092 
12093 	if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
12094 		/* no mbuf's */
12095 		sctp_m_freem(mout);
12096 		return;
12097 	}
12098 #ifdef INET
12099 	if (iph_out != NULL) {
12100 		sctp_route_t ro;
12101 		int ret;
12102 
12103 		/* zap the stack pointer to the route */
12104 		bzero(&ro, sizeof ro);
12105 		if (port) {
12106 			udp->uh_ulen = htons(len - sizeof(struct ip));
12107 			if (V_udp_cksum) {
12108 				udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
12109 			} else {
12110 				udp->uh_sum = 0;
12111 			}
12112 		}
12113 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
12114 		SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
12115 		/* set IPv4 length */
12116 		iph_out->ip_len = len;
12117 		/* out it goes */
12118 #ifdef  SCTP_PACKET_LOGGING
12119 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12120 			sctp_packet_log(mout, len);
12121 #endif
12122 		SCTP_ATTACH_CHAIN(o_pak, mout, len);
12123 		if (port) {
12124 #if defined(SCTP_WITH_NO_CSUM)
12125 			SCTP_STAT_INCR(sctps_sendnocrc);
12126 #else
12127 			abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
12128 			SCTP_STAT_INCR(sctps_sendswcrc);
12129 #endif
12130 			if (V_udp_cksum) {
12131 				SCTP_ENABLE_UDP_CSUM(o_pak);
12132 			}
12133 		} else {
12134 #if defined(SCTP_WITH_NO_CSUM)
12135 			SCTP_STAT_INCR(sctps_sendnocrc);
12136 #else
12137 			mout->m_pkthdr.csum_flags = CSUM_SCTP;
12138 			mout->m_pkthdr.csum_data = 0;
12139 			SCTP_STAT_INCR(sctps_sendhwcrc);
12140 #endif
12141 		}
12142 		SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
12143 
12144 		/* Free the route if we got one back */
12145 		if (ro.ro_rt)
12146 			RTFREE(ro.ro_rt);
12147 	}
12148 #endif
12149 #ifdef INET6
12150 	if (ip6_out != NULL) {
12151 		struct route_in6 ro;
12152 		int ret;
12153 		struct ifnet *ifp = NULL;
12154 
12155 		/* zap the stack pointer to the route */
12156 		bzero(&ro, sizeof(ro));
12157 		if (port) {
12158 			udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12159 		}
12160 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
12161 		SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
12162 		ip6_out->ip6_plen = len - sizeof(*ip6_out);
12163 #ifdef  SCTP_PACKET_LOGGING
12164 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12165 			sctp_packet_log(mout, len);
12166 #endif
12167 		SCTP_ATTACH_CHAIN(o_pak, mout, len);
12168 		if (port) {
12169 #if defined(SCTP_WITH_NO_CSUM)
12170 			SCTP_STAT_INCR(sctps_sendnocrc);
12171 #else
12172 			abm->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
12173 			SCTP_STAT_INCR(sctps_sendswcrc);
12174 #endif
12175 			if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12176 				udp->uh_sum = 0xffff;
12177 			}
12178 		} else {
12179 #if defined(SCTP_WITH_NO_CSUM)
12180 			SCTP_STAT_INCR(sctps_sendnocrc);
12181 #else
12182 			mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
12183 			mout->m_pkthdr.csum_data = 0;
12184 			SCTP_STAT_INCR(sctps_sendhwcrc);
12185 #endif
12186 		}
12187 		SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
12188 
12189 		/* Free the route if we got one back */
12190 		if (ro.ro_rt)
12191 			RTFREE(ro.ro_rt);
12192 	}
12193 #endif
12194 	SCTP_STAT_INCR(sctps_sendpackets);
12195 	SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12196 	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12197 }
12198 
12199 void
12200 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
12201     uint32_t vrf_id, uint16_t port)
12202 {
12203 	struct mbuf *o_pak;
12204 	struct sctphdr *sh, *sh_out;
12205 	struct sctp_chunkhdr *ch;
12206 	struct ip *iph;
12207 	struct udphdr *udp = NULL;
12208 	struct mbuf *mout;
12209 	int iphlen_out, len;
12210 
12211 #ifdef INET
12212 	struct ip *iph_out;
12213 
12214 #endif
12215 #ifdef INET6
12216 	struct ip6_hdr *ip6, *ip6_out;
12217 
12218 #endif
12219 
12220 	iph = mtod(m, struct ip *);
12221 	sh = (struct sctphdr *)((caddr_t)iph + iphlen);
12222 	switch (iph->ip_v) {
12223 #ifdef INET
12224 	case IPVERSION:
12225 		len = (sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
12226 		break;
12227 #endif
12228 #ifdef INET6
12229 	case IPV6_VERSION >> 4:
12230 		len = (sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
12231 		break;
12232 #endif
12233 	default:
12234 		if (scm) {
12235 			sctp_m_freem(scm);
12236 		}
12237 		return;
12238 	}
12239 	if (port) {
12240 		len += sizeof(struct udphdr);
12241 	}
12242 	mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
12243 	if (mout == NULL) {
12244 		if (scm) {
12245 			sctp_m_freem(scm);
12246 		}
12247 		return;
12248 	}
12249 	SCTP_BUF_RESV_UF(mout, max_linkhdr);
12250 	SCTP_BUF_LEN(mout) = len;
12251 	SCTP_BUF_NEXT(mout) = scm;
12252 	if (m->m_flags & M_FLOWID) {
12253 		mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
12254 		mout->m_flags |= M_FLOWID;
12255 	}
12256 #ifdef INET
12257 	iph_out = NULL;
12258 #endif
12259 #ifdef INET6
12260 	ip6_out = NULL;
12261 #endif
12262 	switch (iph->ip_v) {
12263 #ifdef INET
12264 	case IPVERSION:
12265 		iph_out = mtod(mout, struct ip *);
12266 
12267 		/* Fill in the IP header for the ABORT */
12268 		iph_out->ip_v = IPVERSION;
12269 		iph_out->ip_hl = (sizeof(struct ip) / 4);
12270 		iph_out->ip_tos = (u_char)0;
12271 		iph_out->ip_id = 0;
12272 		iph_out->ip_off = 0;
12273 		iph_out->ip_ttl = MAXTTL;
12274 		if (port) {
12275 			iph_out->ip_p = IPPROTO_UDP;
12276 		} else {
12277 			iph_out->ip_p = IPPROTO_SCTP;
12278 		}
12279 		iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
12280 		iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
12281 		/* let IP layer calculate this */
12282 		iph_out->ip_sum = 0;
12283 
12284 		iphlen_out = sizeof(struct ip);
12285 		sh_out = (struct sctphdr *)((caddr_t)iph_out + iphlen_out);
12286 		break;
12287 #endif
12288 #ifdef INET6
12289 	case IPV6_VERSION >> 4:
12290 		ip6 = (struct ip6_hdr *)iph;
12291 		ip6_out = mtod(mout, struct ip6_hdr *);
12292 
12293 		/* Fill in the IP6 header for the ABORT */
12294 		ip6_out->ip6_flow = ip6->ip6_flow;
12295 		ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
12296 		if (port) {
12297 			ip6_out->ip6_nxt = IPPROTO_UDP;
12298 		} else {
12299 			ip6_out->ip6_nxt = IPPROTO_SCTP;
12300 		}
12301 		ip6_out->ip6_src = ip6->ip6_dst;
12302 		ip6_out->ip6_dst = ip6->ip6_src;
12303 
12304 		iphlen_out = sizeof(struct ip6_hdr);
12305 		sh_out = (struct sctphdr *)((caddr_t)ip6_out + iphlen_out);
12306 		break;
12307 #endif				/* INET6 */
12308 	default:
12309 		/* Currently not supported */
12310 		sctp_m_freem(mout);
12311 		return;
12312 	}
12313 
12314 	udp = (struct udphdr *)sh_out;
12315 	if (port) {
12316 		if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
12317 			sctp_m_freem(mout);
12318 			return;
12319 		}
12320 		udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
12321 		udp->uh_dport = port;
12322 		/* set udp->uh_ulen later */
12323 		udp->uh_sum = 0;
12324 		iphlen_out += sizeof(struct udphdr);
12325 		sh_out = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
12326 	}
12327 	sh_out->src_port = sh->dest_port;
12328 	sh_out->dest_port = sh->src_port;
12329 	sh_out->v_tag = vtag;
12330 	sh_out->checksum = 0;
12331 
12332 	ch = (struct sctp_chunkhdr *)((caddr_t)sh_out + sizeof(struct sctphdr));
12333 	ch->chunk_type = SCTP_OPERATION_ERROR;
12334 	ch->chunk_flags = 0;
12335 
12336 	if (scm) {
12337 		struct mbuf *m_tmp = scm;
12338 		int cause_len = 0;
12339 
12340 		/* get length of the err_cause chain */
12341 		while (m_tmp != NULL) {
12342 			cause_len += SCTP_BUF_LEN(m_tmp);
12343 			m_tmp = SCTP_BUF_NEXT(m_tmp);
12344 		}
12345 		len = SCTP_BUF_LEN(mout) + cause_len;
12346 		if (cause_len % 4) {
12347 			/* need pad at end of chunk */
12348 			uint32_t cpthis = 0;
12349 			int padlen;
12350 
12351 			padlen = 4 - (len % 4);
12352 			m_copyback(mout, len, padlen, (caddr_t)&cpthis);
12353 			len += padlen;
12354 		}
12355 		ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
12356 	} else {
12357 		len = SCTP_BUF_LEN(mout);
12358 		ch->chunk_length = htons(sizeof(struct sctp_chunkhdr));
12359 	}
12360 
12361 	if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
12362 		/* no mbuf's */
12363 		sctp_m_freem(mout);
12364 		return;
12365 	}
12366 #ifdef INET
12367 	if (iph_out != NULL) {
12368 		sctp_route_t ro;
12369 		int ret;
12370 
12371 		/* zap the stack pointer to the route */
12372 		bzero(&ro, sizeof ro);
12373 		if (port) {
12374 			udp->uh_ulen = htons(len - sizeof(struct ip));
12375 			if (V_udp_cksum) {
12376 				udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
12377 			} else {
12378 				udp->uh_sum = 0;
12379 			}
12380 		}
12381 		/* set IPv4 length */
12382 		iph_out->ip_len = len;
12383 		/* out it goes */
12384 #ifdef  SCTP_PACKET_LOGGING
12385 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12386 			sctp_packet_log(mout, len);
12387 #endif
12388 		SCTP_ATTACH_CHAIN(o_pak, mout, len);
12389 		if (port) {
12390 #if defined(SCTP_WITH_NO_CSUM)
12391 			SCTP_STAT_INCR(sctps_sendnocrc);
12392 #else
12393 			sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
12394 			SCTP_STAT_INCR(sctps_sendswcrc);
12395 #endif
12396 			if (V_udp_cksum) {
12397 				SCTP_ENABLE_UDP_CSUM(o_pak);
12398 			}
12399 		} else {
12400 #if defined(SCTP_WITH_NO_CSUM)
12401 			SCTP_STAT_INCR(sctps_sendnocrc);
12402 #else
12403 			mout->m_pkthdr.csum_flags = CSUM_SCTP;
12404 			mout->m_pkthdr.csum_data = 0;
12405 			SCTP_STAT_INCR(sctps_sendhwcrc);
12406 #endif
12407 		}
12408 		SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
12409 
12410 		/* Free the route if we got one back */
12411 		if (ro.ro_rt)
12412 			RTFREE(ro.ro_rt);
12413 	}
12414 #endif
12415 #ifdef INET6
12416 	if (ip6_out != NULL) {
12417 		struct route_in6 ro;
12418 		int ret;
12419 		struct ifnet *ifp = NULL;
12420 
12421 		/* zap the stack pointer to the route */
12422 		bzero(&ro, sizeof(ro));
12423 		if (port) {
12424 			udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12425 		}
12426 		ip6_out->ip6_plen = len - sizeof(*ip6_out);
12427 #ifdef  SCTP_PACKET_LOGGING
12428 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12429 			sctp_packet_log(mout, len);
12430 #endif
12431 		SCTP_ATTACH_CHAIN(o_pak, mout, len);
12432 		if (port) {
12433 #if defined(SCTP_WITH_NO_CSUM)
12434 			SCTP_STAT_INCR(sctps_sendnocrc);
12435 #else
12436 			sh_out->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
12437 			SCTP_STAT_INCR(sctps_sendswcrc);
12438 #endif
12439 			if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12440 				udp->uh_sum = 0xffff;
12441 			}
12442 		} else {
12443 #if defined(SCTP_WITH_NO_CSUM)
12444 			SCTP_STAT_INCR(sctps_sendnocrc);
12445 #else
12446 			mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
12447 			mout->m_pkthdr.csum_data = 0;
12448 			SCTP_STAT_INCR(sctps_sendhwcrc);
12449 #endif
12450 		}
12451 		SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
12452 
12453 		/* Free the route if we got one back */
12454 		if (ro.ro_rt)
12455 			RTFREE(ro.ro_rt);
12456 	}
12457 #endif
12458 	SCTP_STAT_INCR(sctps_sendpackets);
12459 	SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12460 	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12461 }
12462 
12463 static struct mbuf *
12464 sctp_copy_resume(struct uio *uio,
12465     int max_send_len,
12466     int user_marks_eor,
12467     int *error,
12468     uint32_t * sndout,
12469     struct mbuf **new_tail)
12470 {
12471 	struct mbuf *m;
12472 
12473 	m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12474 	    (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12475 	if (m == NULL) {
12476 		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12477 		*error = ENOMEM;
12478 	} else {
12479 		*sndout = m_length(m, NULL);
12480 		*new_tail = m_last(m);
12481 	}
12482 	return (m);
12483 }
12484 
12485 static int
12486 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12487     struct uio *uio,
12488     int resv_upfront)
12489 {
12490 	int left;
12491 
12492 	left = sp->length;
12493 	sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12494 	    resv_upfront, 0);
12495 	if (sp->data == NULL) {
12496 		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12497 		return (ENOMEM);
12498 	}
12499 	sp->tail_mbuf = m_last(sp->data);
12500 	return (0);
12501 }
12502 
12503 
12504 
12505 static struct sctp_stream_queue_pending *
12506 sctp_copy_it_in(struct sctp_tcb *stcb,
12507     struct sctp_association *asoc,
12508     struct sctp_sndrcvinfo *srcv,
12509     struct uio *uio,
12510     struct sctp_nets *net,
12511     int max_send_len,
12512     int user_marks_eor,
12513     int *error)
12514 {
12515 	/*-
12516 	 * This routine must be very careful in its work. Protocol
12517 	 * processing is up and running so care must be taken to spl...()
12518 	 * when you need to do something that may effect the stcb/asoc. The
12519 	 * sb is locked however. When data is copied the protocol processing
12520 	 * should be enabled since this is a slower operation...
12521 	 */
12522 	struct sctp_stream_queue_pending *sp = NULL;
12523 	int resv_in_first;
12524 
12525 	*error = 0;
12526 	/* Now can we send this? */
12527 	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12528 	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12529 	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12530 	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12531 		/* got data while shutting down */
12532 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12533 		*error = ECONNRESET;
12534 		goto out_now;
12535 	}
12536 	sctp_alloc_a_strmoq(stcb, sp);
12537 	if (sp == NULL) {
12538 		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12539 		*error = ENOMEM;
12540 		goto out_now;
12541 	}
12542 	sp->act_flags = 0;
12543 	sp->sender_all_done = 0;
12544 	sp->sinfo_flags = srcv->sinfo_flags;
12545 	sp->timetolive = srcv->sinfo_timetolive;
12546 	sp->ppid = srcv->sinfo_ppid;
12547 	sp->context = srcv->sinfo_context;
12548 	sp->strseq = 0;
12549 	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12550 
12551 	sp->stream = srcv->sinfo_stream;
12552 	sp->length = min(uio->uio_resid, max_send_len);
12553 	if ((sp->length == (uint32_t) uio->uio_resid) &&
12554 	    ((user_marks_eor == 0) ||
12555 	    (srcv->sinfo_flags & SCTP_EOF) ||
12556 	    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12557 		sp->msg_is_complete = 1;
12558 	} else {
12559 		sp->msg_is_complete = 0;
12560 	}
12561 	sp->sender_all_done = 0;
12562 	sp->some_taken = 0;
12563 	sp->put_last_out = 0;
12564 	resv_in_first = sizeof(struct sctp_data_chunk);
12565 	sp->data = sp->tail_mbuf = NULL;
12566 	if (sp->length == 0) {
12567 		*error = 0;
12568 		goto skip_copy;
12569 	}
12570 	if (srcv->sinfo_keynumber_valid) {
12571 		sp->auth_keyid = srcv->sinfo_keynumber;
12572 	} else {
12573 		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12574 	}
12575 	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12576 		sctp_auth_key_acquire(stcb, sp->auth_keyid);
12577 		sp->holds_key_ref = 1;
12578 	}
12579 	*error = sctp_copy_one(sp, uio, resv_in_first);
12580 skip_copy:
12581 	if (*error) {
12582 		sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12583 		sp = NULL;
12584 	} else {
12585 		if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12586 			sp->net = net;
12587 			atomic_add_int(&sp->net->ref_count, 1);
12588 		} else {
12589 			sp->net = NULL;
12590 		}
12591 		sctp_set_prsctp_policy(sp);
12592 	}
12593 out_now:
12594 	return (sp);
12595 }
12596 
12597 
12598 int
12599 sctp_sosend(struct socket *so,
12600     struct sockaddr *addr,
12601     struct uio *uio,
12602     struct mbuf *top,
12603     struct mbuf *control,
12604     int flags,
12605     struct thread *p
12606 )
12607 {
12608 	int error, use_sndinfo = 0;
12609 	struct sctp_sndrcvinfo sndrcvninfo;
12610 	struct sockaddr *addr_to_use;
12611 
12612 #if defined(INET) && defined(INET6)
12613 	struct sockaddr_in sin;
12614 
12615 #endif
12616 
12617 	if (control) {
12618 		/* process cmsg snd/rcv info (maybe a assoc-id) */
12619 		if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12620 		    sizeof(sndrcvninfo))) {
12621 			/* got one */
12622 			use_sndinfo = 1;
12623 		}
12624 	}
12625 	addr_to_use = addr;
12626 #if defined(INET) && defined(INET6)
12627 	if ((addr) && (addr->sa_family == AF_INET6)) {
12628 		struct sockaddr_in6 *sin6;
12629 
12630 		sin6 = (struct sockaddr_in6 *)addr;
12631 		if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12632 			in6_sin6_2_sin(&sin, sin6);
12633 			addr_to_use = (struct sockaddr *)&sin;
12634 		}
12635 	}
12636 #endif
12637 	error = sctp_lower_sosend(so, addr_to_use, uio, top,
12638 	    control,
12639 	    flags,
12640 	    use_sndinfo ? &sndrcvninfo : NULL
12641 	    ,p
12642 	    );
12643 	return (error);
12644 }
12645 
12646 
12647 int
12648 sctp_lower_sosend(struct socket *so,
12649     struct sockaddr *addr,
12650     struct uio *uio,
12651     struct mbuf *i_pak,
12652     struct mbuf *control,
12653     int flags,
12654     struct sctp_sndrcvinfo *srcv
12655     ,
12656     struct thread *p
12657 )
12658 {
12659 	unsigned int sndlen = 0, max_len;
12660 	int error, len;
12661 	struct mbuf *top = NULL;
12662 	int queue_only = 0, queue_only_for_init = 0;
12663 	int free_cnt_applied = 0;
12664 	int un_sent;
12665 	int now_filled = 0;
12666 	unsigned int inqueue_bytes = 0;
12667 	struct sctp_block_entry be;
12668 	struct sctp_inpcb *inp;
12669 	struct sctp_tcb *stcb = NULL;
12670 	struct timeval now;
12671 	struct sctp_nets *net;
12672 	struct sctp_association *asoc;
12673 	struct sctp_inpcb *t_inp;
12674 	int user_marks_eor;
12675 	int create_lock_applied = 0;
12676 	int nagle_applies = 0;
12677 	int some_on_control = 0;
12678 	int got_all_of_the_send = 0;
12679 	int hold_tcblock = 0;
12680 	int non_blocking = 0;
12681 	uint32_t local_add_more, local_soresv = 0;
12682 	uint16_t port;
12683 	uint16_t sinfo_flags;
12684 	sctp_assoc_t sinfo_assoc_id;
12685 
12686 	error = 0;
12687 	net = NULL;
12688 	stcb = NULL;
12689 	asoc = NULL;
12690 
12691 	t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12692 	if (inp == NULL) {
12693 		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12694 		error = EINVAL;
12695 		if (i_pak) {
12696 			SCTP_RELEASE_PKT(i_pak);
12697 		}
12698 		return (error);
12699 	}
12700 	if ((uio == NULL) && (i_pak == NULL)) {
12701 		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12702 		return (EINVAL);
12703 	}
12704 	user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12705 	atomic_add_int(&inp->total_sends, 1);
12706 	if (uio) {
12707 		if (uio->uio_resid < 0) {
12708 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12709 			return (EINVAL);
12710 		}
12711 		sndlen = uio->uio_resid;
12712 	} else {
12713 		top = SCTP_HEADER_TO_CHAIN(i_pak);
12714 		sndlen = SCTP_HEADER_LEN(i_pak);
12715 	}
12716 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12717 	    addr,
12718 	    sndlen);
12719 	if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12720 	    (inp->sctp_socket->so_qlimit)) {
12721 		/* The listener can NOT send */
12722 		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12723 		error = ENOTCONN;
12724 		goto out_unlocked;
12725 	}
12726 	/**
12727 	 * Pre-screen address, if one is given the sin-len
12728 	 * must be set correctly!
12729 	 */
12730 	if (addr) {
12731 		union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12732 
12733 		switch (raddr->sa.sa_family) {
12734 #if defined(INET)
12735 		case AF_INET:
12736 			if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12737 				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12738 				error = EINVAL;
12739 				goto out_unlocked;
12740 			}
12741 			port = raddr->sin.sin_port;
12742 			break;
12743 #endif
12744 #if defined(INET6)
12745 		case AF_INET6:
12746 			if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12747 				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12748 				error = EINVAL;
12749 				goto out_unlocked;
12750 			}
12751 			port = raddr->sin6.sin6_port;
12752 			break;
12753 #endif
12754 		default:
12755 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12756 			error = EAFNOSUPPORT;
12757 			goto out_unlocked;
12758 		}
12759 	} else
12760 		port = 0;
12761 
12762 	if (srcv) {
12763 		sinfo_flags = srcv->sinfo_flags;
12764 		sinfo_assoc_id = srcv->sinfo_assoc_id;
12765 		if (INVALID_SINFO_FLAG(sinfo_flags) ||
12766 		    PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12767 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12768 			error = EINVAL;
12769 			goto out_unlocked;
12770 		}
12771 		if (srcv->sinfo_flags)
12772 			SCTP_STAT_INCR(sctps_sends_with_flags);
12773 	} else {
12774 		sinfo_flags = inp->def_send.sinfo_flags;
12775 		sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12776 	}
12777 	if (sinfo_flags & SCTP_SENDALL) {
12778 		/* its a sendall */
12779 		error = sctp_sendall(inp, uio, top, srcv);
12780 		top = NULL;
12781 		goto out_unlocked;
12782 	}
12783 	if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12784 		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12785 		error = EINVAL;
12786 		goto out_unlocked;
12787 	}
12788 	/* now we must find the assoc */
12789 	if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12790 	    (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12791 		SCTP_INP_RLOCK(inp);
12792 		stcb = LIST_FIRST(&inp->sctp_asoc_list);
12793 		if (stcb) {
12794 			SCTP_TCB_LOCK(stcb);
12795 			hold_tcblock = 1;
12796 		}
12797 		SCTP_INP_RUNLOCK(inp);
12798 	} else if (sinfo_assoc_id) {
12799 		stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12800 	} else if (addr) {
12801 		/*-
12802 		 * Since we did not use findep we must
12803 		 * increment it, and if we don't find a tcb
12804 		 * decrement it.
12805 		 */
12806 		SCTP_INP_WLOCK(inp);
12807 		SCTP_INP_INCR_REF(inp);
12808 		SCTP_INP_WUNLOCK(inp);
12809 		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12810 		if (stcb == NULL) {
12811 			SCTP_INP_WLOCK(inp);
12812 			SCTP_INP_DECR_REF(inp);
12813 			SCTP_INP_WUNLOCK(inp);
12814 		} else {
12815 			hold_tcblock = 1;
12816 		}
12817 	}
12818 	if ((stcb == NULL) && (addr)) {
12819 		/* Possible implicit send? */
12820 		SCTP_ASOC_CREATE_LOCK(inp);
12821 		create_lock_applied = 1;
12822 		if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12823 		    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12824 			/* Should I really unlock ? */
12825 			SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12826 			error = EINVAL;
12827 			goto out_unlocked;
12828 
12829 		}
12830 		if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12831 		    (addr->sa_family == AF_INET6)) {
12832 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12833 			error = EINVAL;
12834 			goto out_unlocked;
12835 		}
12836 		SCTP_INP_WLOCK(inp);
12837 		SCTP_INP_INCR_REF(inp);
12838 		SCTP_INP_WUNLOCK(inp);
12839 		/* With the lock applied look again */
12840 		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12841 		if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12842 			stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12843 		}
12844 		if (stcb == NULL) {
12845 			SCTP_INP_WLOCK(inp);
12846 			SCTP_INP_DECR_REF(inp);
12847 			SCTP_INP_WUNLOCK(inp);
12848 		} else {
12849 			hold_tcblock = 1;
12850 		}
12851 		if (error) {
12852 			goto out_unlocked;
12853 		}
12854 		if (t_inp != inp) {
12855 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12856 			error = ENOTCONN;
12857 			goto out_unlocked;
12858 		}
12859 	}
12860 	if (stcb == NULL) {
12861 		if (addr == NULL) {
12862 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12863 			error = ENOENT;
12864 			goto out_unlocked;
12865 		} else {
12866 			/* We must go ahead and start the INIT process */
12867 			uint32_t vrf_id;
12868 
12869 			if ((sinfo_flags & SCTP_ABORT) ||
12870 			    ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12871 				/*-
12872 				 * User asks to abort a non-existant assoc,
12873 				 * or EOF a non-existant assoc with no data
12874 				 */
12875 				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12876 				error = ENOENT;
12877 				goto out_unlocked;
12878 			}
12879 			/* get an asoc/stcb struct */
12880 			vrf_id = inp->def_vrf_id;
12881 #ifdef INVARIANTS
12882 			if (create_lock_applied == 0) {
12883 				panic("Error, should hold create lock and I don't?");
12884 			}
12885 #endif
12886 			stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12887 			    p
12888 			    );
12889 			if (stcb == NULL) {
12890 				/* Error is setup for us in the call */
12891 				goto out_unlocked;
12892 			}
12893 			if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12894 				stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12895 				/*
12896 				 * Set the connected flag so we can queue
12897 				 * data
12898 				 */
12899 				soisconnecting(so);
12900 			}
12901 			hold_tcblock = 1;
12902 			if (create_lock_applied) {
12903 				SCTP_ASOC_CREATE_UNLOCK(inp);
12904 				create_lock_applied = 0;
12905 			} else {
12906 				SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12907 			}
12908 			/*
12909 			 * Turn on queue only flag to prevent data from
12910 			 * being sent
12911 			 */
12912 			queue_only = 1;
12913 			asoc = &stcb->asoc;
12914 			SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12915 			(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12916 
12917 			/* initialize authentication params for the assoc */
12918 			sctp_initialize_auth_params(inp, stcb);
12919 
12920 			if (control) {
12921 				if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12922 					sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12923 					hold_tcblock = 0;
12924 					stcb = NULL;
12925 					goto out_unlocked;
12926 				}
12927 			}
12928 			/* out with the INIT */
12929 			queue_only_for_init = 1;
12930 			/*-
12931 			 * we may want to dig in after this call and adjust the MTU
12932 			 * value. It defaulted to 1500 (constant) but the ro
12933 			 * structure may now have an update and thus we may need to
12934 			 * change it BEFORE we append the message.
12935 			 */
12936 		}
12937 	} else
12938 		asoc = &stcb->asoc;
12939 	if (srcv == NULL)
12940 		srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12941 	if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12942 		if (addr)
12943 			net = sctp_findnet(stcb, addr);
12944 		else
12945 			net = NULL;
12946 		if ((net == NULL) ||
12947 		    ((port != 0) && (port != stcb->rport))) {
12948 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12949 			error = EINVAL;
12950 			goto out_unlocked;
12951 		}
12952 	} else {
12953 		if (stcb->asoc.alternate) {
12954 			net = stcb->asoc.alternate;
12955 		} else {
12956 			net = stcb->asoc.primary_destination;
12957 		}
12958 	}
12959 	atomic_add_int(&stcb->total_sends, 1);
12960 	/* Keep the stcb from being freed under our feet */
12961 	atomic_add_int(&asoc->refcnt, 1);
12962 	free_cnt_applied = 1;
12963 
12964 	if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12965 		if (sndlen > asoc->smallest_mtu) {
12966 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12967 			error = EMSGSIZE;
12968 			goto out_unlocked;
12969 		}
12970 	}
12971 	if (SCTP_SO_IS_NBIO(so)
12972 	    || (flags & MSG_NBIO)
12973 	    ) {
12974 		non_blocking = 1;
12975 	}
12976 	/* would we block? */
12977 	if (non_blocking) {
12978 		if (hold_tcblock == 0) {
12979 			SCTP_TCB_LOCK(stcb);
12980 			hold_tcblock = 1;
12981 		}
12982 		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12983 		if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12984 		    (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12985 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12986 			if (sndlen > SCTP_SB_LIMIT_SND(so))
12987 				error = EMSGSIZE;
12988 			else
12989 				error = EWOULDBLOCK;
12990 			goto out_unlocked;
12991 		}
12992 		stcb->asoc.sb_send_resv += sndlen;
12993 		SCTP_TCB_UNLOCK(stcb);
12994 		hold_tcblock = 0;
12995 	} else {
12996 		atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12997 	}
12998 	local_soresv = sndlen;
12999 	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13000 		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13001 		error = ECONNRESET;
13002 		goto out_unlocked;
13003 	}
13004 	if (create_lock_applied) {
13005 		SCTP_ASOC_CREATE_UNLOCK(inp);
13006 		create_lock_applied = 0;
13007 	}
13008 	if (asoc->stream_reset_outstanding) {
13009 		/*
13010 		 * Can't queue any data while stream reset is underway.
13011 		 */
13012 		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
13013 		error = EAGAIN;
13014 		goto out_unlocked;
13015 	}
13016 	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
13017 	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
13018 		queue_only = 1;
13019 	}
13020 	/* we are now done with all control */
13021 	if (control) {
13022 		sctp_m_freem(control);
13023 		control = NULL;
13024 	}
13025 	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
13026 	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
13027 	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
13028 	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
13029 		if (srcv->sinfo_flags & SCTP_ABORT) {
13030 			;
13031 		} else {
13032 			SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13033 			error = ECONNRESET;
13034 			goto out_unlocked;
13035 		}
13036 	}
13037 	/* Ok, we will attempt a msgsnd :> */
13038 	if (p) {
13039 		p->td_ru.ru_msgsnd++;
13040 	}
13041 	/* Are we aborting? */
13042 	if (srcv->sinfo_flags & SCTP_ABORT) {
13043 		struct mbuf *mm;
13044 		int tot_demand, tot_out = 0, max_out;
13045 
13046 		SCTP_STAT_INCR(sctps_sends_with_abort);
13047 		if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
13048 		    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
13049 			/* It has to be up before we abort */
13050 			/* how big is the user initiated abort? */
13051 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13052 			error = EINVAL;
13053 			goto out;
13054 		}
13055 		if (hold_tcblock) {
13056 			SCTP_TCB_UNLOCK(stcb);
13057 			hold_tcblock = 0;
13058 		}
13059 		if (top) {
13060 			struct mbuf *cntm = NULL;
13061 
13062 			mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAIT, 1, MT_DATA);
13063 			if (sndlen != 0) {
13064 				for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
13065 					tot_out += SCTP_BUF_LEN(cntm);
13066 				}
13067 			}
13068 		} else {
13069 			/* Must fit in a MTU */
13070 			tot_out = sndlen;
13071 			tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
13072 			if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
13073 				/* To big */
13074 				SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13075 				error = EMSGSIZE;
13076 				goto out;
13077 			}
13078 			mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
13079 		}
13080 		if (mm == NULL) {
13081 			SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
13082 			error = ENOMEM;
13083 			goto out;
13084 		}
13085 		max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
13086 		max_out -= sizeof(struct sctp_abort_msg);
13087 		if (tot_out > max_out) {
13088 			tot_out = max_out;
13089 		}
13090 		if (mm) {
13091 			struct sctp_paramhdr *ph;
13092 
13093 			/* now move forward the data pointer */
13094 			ph = mtod(mm, struct sctp_paramhdr *);
13095 			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
13096 			ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
13097 			ph++;
13098 			SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
13099 			if (top == NULL) {
13100 				error = uiomove((caddr_t)ph, (int)tot_out, uio);
13101 				if (error) {
13102 					/*-
13103 					 * Here if we can't get his data we
13104 					 * still abort we just don't get to
13105 					 * send the users note :-0
13106 					 */
13107 					sctp_m_freem(mm);
13108 					mm = NULL;
13109 				}
13110 			} else {
13111 				if (sndlen != 0) {
13112 					SCTP_BUF_NEXT(mm) = top;
13113 				}
13114 			}
13115 		}
13116 		if (hold_tcblock == 0) {
13117 			SCTP_TCB_LOCK(stcb);
13118 		}
13119 		atomic_add_int(&stcb->asoc.refcnt, -1);
13120 		free_cnt_applied = 0;
13121 		/* release this lock, otherwise we hang on ourselves */
13122 		sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13123 		/* now relock the stcb so everything is sane */
13124 		hold_tcblock = 0;
13125 		stcb = NULL;
13126 		/*
13127 		 * In this case top is already chained to mm avoid double
13128 		 * free, since we free it below if top != NULL and driver
13129 		 * would free it after sending the packet out
13130 		 */
13131 		if (sndlen != 0) {
13132 			top = NULL;
13133 		}
13134 		goto out_unlocked;
13135 	}
13136 	/* Calculate the maximum we can send */
13137 	inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13138 	if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13139 		if (non_blocking) {
13140 			/* we already checked for non-blocking above. */
13141 			max_len = sndlen;
13142 		} else {
13143 			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13144 		}
13145 	} else {
13146 		max_len = 0;
13147 	}
13148 	if (hold_tcblock) {
13149 		SCTP_TCB_UNLOCK(stcb);
13150 		hold_tcblock = 0;
13151 	}
13152 	/* Is the stream no. valid? */
13153 	if (srcv->sinfo_stream >= asoc->streamoutcnt) {
13154 		/* Invalid stream number */
13155 		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13156 		error = EINVAL;
13157 		goto out_unlocked;
13158 	}
13159 	if (asoc->strmout == NULL) {
13160 		/* huh? software error */
13161 		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13162 		error = EFAULT;
13163 		goto out_unlocked;
13164 	}
13165 	/* Unless E_EOR mode is on, we must make a send FIT in one call. */
13166 	if ((user_marks_eor == 0) &&
13167 	    (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13168 		/* It will NEVER fit */
13169 		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13170 		error = EMSGSIZE;
13171 		goto out_unlocked;
13172 	}
13173 	if ((uio == NULL) && user_marks_eor) {
13174 		/*-
13175 		 * We do not support eeor mode for
13176 		 * sending with mbuf chains (like sendfile).
13177 		 */
13178 		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13179 		error = EINVAL;
13180 		goto out_unlocked;
13181 	}
13182 	if (user_marks_eor) {
13183 		local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13184 	} else {
13185 		/*-
13186 		 * For non-eeor the whole message must fit in
13187 		 * the socket send buffer.
13188 		 */
13189 		local_add_more = sndlen;
13190 	}
13191 	len = 0;
13192 	if (non_blocking) {
13193 		goto skip_preblock;
13194 	}
13195 	if (((max_len <= local_add_more) &&
13196 	    (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13197 	    (max_len == 0) ||
13198 	    ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13199 		/* No room right now ! */
13200 		SOCKBUF_LOCK(&so->so_snd);
13201 		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13202 		while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13203 		    ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13204 			SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13205 			    (unsigned int)SCTP_SB_LIMIT_SND(so),
13206 			    inqueue_bytes,
13207 			    local_add_more,
13208 			    stcb->asoc.stream_queue_cnt,
13209 			    stcb->asoc.chunks_on_out_queue,
13210 			    SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13211 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13212 				sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13213 			}
13214 			be.error = 0;
13215 			stcb->block_entry = &be;
13216 			error = sbwait(&so->so_snd);
13217 			stcb->block_entry = NULL;
13218 			if (error || so->so_error || be.error) {
13219 				if (error == 0) {
13220 					if (so->so_error)
13221 						error = so->so_error;
13222 					if (be.error) {
13223 						error = be.error;
13224 					}
13225 				}
13226 				SOCKBUF_UNLOCK(&so->so_snd);
13227 				goto out_unlocked;
13228 			}
13229 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13230 				sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13231 				    asoc, stcb->asoc.total_output_queue_size);
13232 			}
13233 			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13234 				goto out_unlocked;
13235 			}
13236 			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13237 		}
13238 		if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13239 			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13240 		} else {
13241 			max_len = 0;
13242 		}
13243 		SOCKBUF_UNLOCK(&so->so_snd);
13244 	}
13245 skip_preblock:
13246 	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13247 		goto out_unlocked;
13248 	}
13249 	/*
13250 	 * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13251 	 * case NOTE: uio will be null when top/mbuf is passed
13252 	 */
13253 	if (sndlen == 0) {
13254 		if (srcv->sinfo_flags & SCTP_EOF) {
13255 			got_all_of_the_send = 1;
13256 			goto dataless_eof;
13257 		} else {
13258 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13259 			error = EINVAL;
13260 			goto out;
13261 		}
13262 	}
13263 	if (top == NULL) {
13264 		struct sctp_stream_queue_pending *sp;
13265 		struct sctp_stream_out *strm;
13266 		uint32_t sndout;
13267 
13268 		SCTP_TCB_SEND_LOCK(stcb);
13269 		if ((asoc->stream_locked) &&
13270 		    (asoc->stream_locked_on != srcv->sinfo_stream)) {
13271 			SCTP_TCB_SEND_UNLOCK(stcb);
13272 			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13273 			error = EINVAL;
13274 			goto out;
13275 		}
13276 		SCTP_TCB_SEND_UNLOCK(stcb);
13277 
13278 		strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13279 		if (strm->last_msg_incomplete == 0) {
13280 	do_a_copy_in:
13281 			sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13282 			if ((sp == NULL) || (error)) {
13283 				goto out;
13284 			}
13285 			SCTP_TCB_SEND_LOCK(stcb);
13286 			if (sp->msg_is_complete) {
13287 				strm->last_msg_incomplete = 0;
13288 				asoc->stream_locked = 0;
13289 			} else {
13290 				/*
13291 				 * Just got locked to this guy in case of an
13292 				 * interrupt.
13293 				 */
13294 				strm->last_msg_incomplete = 1;
13295 				asoc->stream_locked = 1;
13296 				asoc->stream_locked_on = srcv->sinfo_stream;
13297 				sp->sender_all_done = 0;
13298 			}
13299 			sctp_snd_sb_alloc(stcb, sp->length);
13300 			atomic_add_int(&asoc->stream_queue_cnt, 1);
13301 			if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
13302 				sp->strseq = strm->next_sequence_sent;
13303 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
13304 					sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
13305 					    (uintptr_t) stcb, sp->length,
13306 					    (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
13307 				}
13308 				strm->next_sequence_sent++;
13309 			} else {
13310 				SCTP_STAT_INCR(sctps_sends_with_unord);
13311 			}
13312 			TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13313 			stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13314 			SCTP_TCB_SEND_UNLOCK(stcb);
13315 		} else {
13316 			SCTP_TCB_SEND_LOCK(stcb);
13317 			sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13318 			SCTP_TCB_SEND_UNLOCK(stcb);
13319 			if (sp == NULL) {
13320 				/* ???? Huh ??? last msg is gone */
13321 #ifdef INVARIANTS
13322 				panic("Warning: Last msg marked incomplete, yet nothing left?");
13323 #else
13324 				SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13325 				strm->last_msg_incomplete = 0;
13326 #endif
13327 				goto do_a_copy_in;
13328 
13329 			}
13330 		}
13331 		while (uio->uio_resid > 0) {
13332 			/* How much room do we have? */
13333 			struct mbuf *new_tail, *mm;
13334 
13335 			if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13336 				max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13337 			else
13338 				max_len = 0;
13339 
13340 			if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13341 			    (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13342 			    (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13343 				sndout = 0;
13344 				new_tail = NULL;
13345 				if (hold_tcblock) {
13346 					SCTP_TCB_UNLOCK(stcb);
13347 					hold_tcblock = 0;
13348 				}
13349 				mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13350 				if ((mm == NULL) || error) {
13351 					if (mm) {
13352 						sctp_m_freem(mm);
13353 					}
13354 					goto out;
13355 				}
13356 				/* Update the mbuf and count */
13357 				SCTP_TCB_SEND_LOCK(stcb);
13358 				if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13359 					/*
13360 					 * we need to get out. Peer probably
13361 					 * aborted.
13362 					 */
13363 					sctp_m_freem(mm);
13364 					if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13365 						SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13366 						error = ECONNRESET;
13367 					}
13368 					SCTP_TCB_SEND_UNLOCK(stcb);
13369 					goto out;
13370 				}
13371 				if (sp->tail_mbuf) {
13372 					/* tack it to the end */
13373 					SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13374 					sp->tail_mbuf = new_tail;
13375 				} else {
13376 					/* A stolen mbuf */
13377 					sp->data = mm;
13378 					sp->tail_mbuf = new_tail;
13379 				}
13380 				sctp_snd_sb_alloc(stcb, sndout);
13381 				atomic_add_int(&sp->length, sndout);
13382 				len += sndout;
13383 
13384 				/* Did we reach EOR? */
13385 				if ((uio->uio_resid == 0) &&
13386 				    ((user_marks_eor == 0) ||
13387 				    (srcv->sinfo_flags & SCTP_EOF) ||
13388 				    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13389 					sp->msg_is_complete = 1;
13390 				} else {
13391 					sp->msg_is_complete = 0;
13392 				}
13393 				SCTP_TCB_SEND_UNLOCK(stcb);
13394 			}
13395 			if (uio->uio_resid == 0) {
13396 				/* got it all? */
13397 				continue;
13398 			}
13399 			/* PR-SCTP? */
13400 			if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
13401 				/*
13402 				 * This is ugly but we must assure locking
13403 				 * order
13404 				 */
13405 				if (hold_tcblock == 0) {
13406 					SCTP_TCB_LOCK(stcb);
13407 					hold_tcblock = 1;
13408 				}
13409 				sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13410 				inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13411 				if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13412 					max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13413 				else
13414 					max_len = 0;
13415 				if (max_len > 0) {
13416 					continue;
13417 				}
13418 				SCTP_TCB_UNLOCK(stcb);
13419 				hold_tcblock = 0;
13420 			}
13421 			/* wait for space now */
13422 			if (non_blocking) {
13423 				/* Non-blocking io in place out */
13424 				goto skip_out_eof;
13425 			}
13426 			/* What about the INIT, send it maybe */
13427 			if (queue_only_for_init) {
13428 				if (hold_tcblock == 0) {
13429 					SCTP_TCB_LOCK(stcb);
13430 					hold_tcblock = 1;
13431 				}
13432 				if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13433 					/* a collision took us forward? */
13434 					queue_only = 0;
13435 				} else {
13436 					sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13437 					SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13438 					queue_only = 1;
13439 				}
13440 			}
13441 			if ((net->flight_size > net->cwnd) &&
13442 			    (asoc->sctp_cmt_on_off == 0)) {
13443 				SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13444 				queue_only = 1;
13445 			} else if (asoc->ifp_had_enobuf) {
13446 				SCTP_STAT_INCR(sctps_ifnomemqueued);
13447 				if (net->flight_size > (2 * net->mtu)) {
13448 					queue_only = 1;
13449 				}
13450 				asoc->ifp_had_enobuf = 0;
13451 			}
13452 			un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13453 			    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13454 			if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13455 			    (stcb->asoc.total_flight > 0) &&
13456 			    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13457 			    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13458 
13459 				/*-
13460 				 * Ok, Nagle is set on and we have data outstanding.
13461 				 * Don't send anything and let SACKs drive out the
13462 				 * data unless wen have a "full" segment to send.
13463 				 */
13464 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13465 					sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13466 				}
13467 				SCTP_STAT_INCR(sctps_naglequeued);
13468 				nagle_applies = 1;
13469 			} else {
13470 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13471 					if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13472 						sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13473 				}
13474 				SCTP_STAT_INCR(sctps_naglesent);
13475 				nagle_applies = 0;
13476 			}
13477 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13478 
13479 				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13480 				    nagle_applies, un_sent);
13481 				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13482 				    stcb->asoc.total_flight,
13483 				    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13484 			}
13485 			if (queue_only_for_init)
13486 				queue_only_for_init = 0;
13487 			if ((queue_only == 0) && (nagle_applies == 0)) {
13488 				/*-
13489 				 * need to start chunk output
13490 				 * before blocking.. note that if
13491 				 * a lock is already applied, then
13492 				 * the input via the net is happening
13493 				 * and I don't need to start output :-D
13494 				 */
13495 				if (hold_tcblock == 0) {
13496 					if (SCTP_TCB_TRYLOCK(stcb)) {
13497 						hold_tcblock = 1;
13498 						sctp_chunk_output(inp,
13499 						    stcb,
13500 						    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13501 					}
13502 				} else {
13503 					sctp_chunk_output(inp,
13504 					    stcb,
13505 					    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13506 				}
13507 				if (hold_tcblock == 1) {
13508 					SCTP_TCB_UNLOCK(stcb);
13509 					hold_tcblock = 0;
13510 				}
13511 			}
13512 			SOCKBUF_LOCK(&so->so_snd);
13513 			/*-
13514 			 * This is a bit strange, but I think it will
13515 			 * work. The total_output_queue_size is locked and
13516 			 * protected by the TCB_LOCK, which we just released.
13517 			 * There is a race that can occur between releasing it
13518 			 * above, and me getting the socket lock, where sacks
13519 			 * come in but we have not put the SB_WAIT on the
13520 			 * so_snd buffer to get the wakeup. After the LOCK
13521 			 * is applied the sack_processing will also need to
13522 			 * LOCK the so->so_snd to do the actual sowwakeup(). So
13523 			 * once we have the socket buffer lock if we recheck the
13524 			 * size we KNOW we will get to sleep safely with the
13525 			 * wakeup flag in place.
13526 			 */
13527 			if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13528 			    min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13529 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13530 					sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13531 					    asoc, uio->uio_resid);
13532 				}
13533 				be.error = 0;
13534 				stcb->block_entry = &be;
13535 				error = sbwait(&so->so_snd);
13536 				stcb->block_entry = NULL;
13537 
13538 				if (error || so->so_error || be.error) {
13539 					if (error == 0) {
13540 						if (so->so_error)
13541 							error = so->so_error;
13542 						if (be.error) {
13543 							error = be.error;
13544 						}
13545 					}
13546 					SOCKBUF_UNLOCK(&so->so_snd);
13547 					goto out_unlocked;
13548 				}
13549 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13550 					sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13551 					    asoc, stcb->asoc.total_output_queue_size);
13552 				}
13553 			}
13554 			SOCKBUF_UNLOCK(&so->so_snd);
13555 			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13556 				goto out_unlocked;
13557 			}
13558 		}
13559 		SCTP_TCB_SEND_LOCK(stcb);
13560 		if (sp) {
13561 			if (sp->msg_is_complete == 0) {
13562 				strm->last_msg_incomplete = 1;
13563 				asoc->stream_locked = 1;
13564 				asoc->stream_locked_on = srcv->sinfo_stream;
13565 			} else {
13566 				sp->sender_all_done = 1;
13567 				strm->last_msg_incomplete = 0;
13568 				asoc->stream_locked = 0;
13569 			}
13570 		} else {
13571 			SCTP_PRINTF("Huh no sp TSNH?\n");
13572 			strm->last_msg_incomplete = 0;
13573 			asoc->stream_locked = 0;
13574 		}
13575 		SCTP_TCB_SEND_UNLOCK(stcb);
13576 		if (uio->uio_resid == 0) {
13577 			got_all_of_the_send = 1;
13578 		}
13579 	} else {
13580 		/* We send in a 0, since we do NOT have any locks */
13581 		error = sctp_msg_append(stcb, net, top, srcv, 0);
13582 		top = NULL;
13583 		if (srcv->sinfo_flags & SCTP_EOF) {
13584 			/*
13585 			 * This should only happen for Panda for the mbuf
13586 			 * send case, which does NOT yet support EEOR mode.
13587 			 * Thus, we can just set this flag to do the proper
13588 			 * EOF handling.
13589 			 */
13590 			got_all_of_the_send = 1;
13591 		}
13592 	}
13593 	if (error) {
13594 		goto out;
13595 	}
13596 dataless_eof:
13597 	/* EOF thing ? */
13598 	if ((srcv->sinfo_flags & SCTP_EOF) &&
13599 	    (got_all_of_the_send == 1)) {
13600 		int cnt;
13601 
13602 		SCTP_STAT_INCR(sctps_sends_with_eof);
13603 		error = 0;
13604 		if (hold_tcblock == 0) {
13605 			SCTP_TCB_LOCK(stcb);
13606 			hold_tcblock = 1;
13607 		}
13608 		cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13609 		if (TAILQ_EMPTY(&asoc->send_queue) &&
13610 		    TAILQ_EMPTY(&asoc->sent_queue) &&
13611 		    (cnt == 0)) {
13612 			if (asoc->locked_on_sending) {
13613 				goto abort_anyway;
13614 			}
13615 			/* there is nothing queued to send, so I'm done... */
13616 			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13617 			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13618 			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13619 				struct sctp_nets *netp;
13620 
13621 				if (stcb->asoc.alternate) {
13622 					netp = stcb->asoc.alternate;
13623 				} else {
13624 					netp = stcb->asoc.primary_destination;
13625 				}
13626 				/* only send SHUTDOWN the first time through */
13627 				sctp_send_shutdown(stcb, netp);
13628 				if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13629 					SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13630 				}
13631 				SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13632 				SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13633 				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13634 				    netp);
13635 				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13636 				    asoc->primary_destination);
13637 			}
13638 		} else {
13639 			/*-
13640 			 * we still got (or just got) data to send, so set
13641 			 * SHUTDOWN_PENDING
13642 			 */
13643 			/*-
13644 			 * XXX sockets draft says that SCTP_EOF should be
13645 			 * sent with no data.  currently, we will allow user
13646 			 * data to be sent first and move to
13647 			 * SHUTDOWN-PENDING
13648 			 */
13649 			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13650 			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13651 			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13652 				if (hold_tcblock == 0) {
13653 					SCTP_TCB_LOCK(stcb);
13654 					hold_tcblock = 1;
13655 				}
13656 				if (asoc->locked_on_sending) {
13657 					/* Locked to send out the data */
13658 					struct sctp_stream_queue_pending *sp;
13659 
13660 					sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13661 					if (sp) {
13662 						if ((sp->length == 0) && (sp->msg_is_complete == 0))
13663 							asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13664 					}
13665 				}
13666 				asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13667 				if (TAILQ_EMPTY(&asoc->send_queue) &&
13668 				    TAILQ_EMPTY(&asoc->sent_queue) &&
13669 				    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13670 			abort_anyway:
13671 					if (free_cnt_applied) {
13672 						atomic_add_int(&stcb->asoc.refcnt, -1);
13673 						free_cnt_applied = 0;
13674 					}
13675 					sctp_abort_an_association(stcb->sctp_ep, stcb,
13676 					    NULL, SCTP_SO_LOCKED);
13677 					/*
13678 					 * now relock the stcb so everything
13679 					 * is sane
13680 					 */
13681 					hold_tcblock = 0;
13682 					stcb = NULL;
13683 					goto out;
13684 				}
13685 				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13686 				    asoc->primary_destination);
13687 				sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13688 			}
13689 		}
13690 	}
13691 skip_out_eof:
13692 	if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13693 		some_on_control = 1;
13694 	}
13695 	if (queue_only_for_init) {
13696 		if (hold_tcblock == 0) {
13697 			SCTP_TCB_LOCK(stcb);
13698 			hold_tcblock = 1;
13699 		}
13700 		if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13701 			/* a collision took us forward? */
13702 			queue_only = 0;
13703 		} else {
13704 			sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13705 			SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13706 			queue_only = 1;
13707 		}
13708 	}
13709 	if ((net->flight_size > net->cwnd) &&
13710 	    (stcb->asoc.sctp_cmt_on_off == 0)) {
13711 		SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13712 		queue_only = 1;
13713 	} else if (asoc->ifp_had_enobuf) {
13714 		SCTP_STAT_INCR(sctps_ifnomemqueued);
13715 		if (net->flight_size > (2 * net->mtu)) {
13716 			queue_only = 1;
13717 		}
13718 		asoc->ifp_had_enobuf = 0;
13719 	}
13720 	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13721 	    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13722 	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13723 	    (stcb->asoc.total_flight > 0) &&
13724 	    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13725 	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13726 		/*-
13727 		 * Ok, Nagle is set on and we have data outstanding.
13728 		 * Don't send anything and let SACKs drive out the
13729 		 * data unless wen have a "full" segment to send.
13730 		 */
13731 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13732 			sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13733 		}
13734 		SCTP_STAT_INCR(sctps_naglequeued);
13735 		nagle_applies = 1;
13736 	} else {
13737 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13738 			if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13739 				sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13740 		}
13741 		SCTP_STAT_INCR(sctps_naglesent);
13742 		nagle_applies = 0;
13743 	}
13744 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13745 		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13746 		    nagle_applies, un_sent);
13747 		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13748 		    stcb->asoc.total_flight,
13749 		    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13750 	}
13751 	if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13752 		/* we can attempt to send too. */
13753 		if (hold_tcblock == 0) {
13754 			/*
13755 			 * If there is activity recv'ing sacks no need to
13756 			 * send
13757 			 */
13758 			if (SCTP_TCB_TRYLOCK(stcb)) {
13759 				sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13760 				hold_tcblock = 1;
13761 			}
13762 		} else {
13763 			sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13764 		}
13765 	} else if ((queue_only == 0) &&
13766 		    (stcb->asoc.peers_rwnd == 0) &&
13767 	    (stcb->asoc.total_flight == 0)) {
13768 		/* We get to have a probe outstanding */
13769 		if (hold_tcblock == 0) {
13770 			hold_tcblock = 1;
13771 			SCTP_TCB_LOCK(stcb);
13772 		}
13773 		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13774 	} else if (some_on_control) {
13775 		int num_out, reason, frag_point;
13776 
13777 		/* Here we do control only */
13778 		if (hold_tcblock == 0) {
13779 			hold_tcblock = 1;
13780 			SCTP_TCB_LOCK(stcb);
13781 		}
13782 		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13783 		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13784 		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13785 	}
13786 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13787 	    queue_only, stcb->asoc.peers_rwnd, un_sent,
13788 	    stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13789 	    stcb->asoc.total_output_queue_size, error);
13790 
13791 out:
13792 out_unlocked:
13793 
13794 	if (local_soresv && stcb) {
13795 		atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13796 	}
13797 	if (create_lock_applied) {
13798 		SCTP_ASOC_CREATE_UNLOCK(inp);
13799 	}
13800 	if ((stcb) && hold_tcblock) {
13801 		SCTP_TCB_UNLOCK(stcb);
13802 	}
13803 	if (stcb && free_cnt_applied) {
13804 		atomic_add_int(&stcb->asoc.refcnt, -1);
13805 	}
13806 #ifdef INVARIANTS
13807 	if (stcb) {
13808 		if (mtx_owned(&stcb->tcb_mtx)) {
13809 			panic("Leaving with tcb mtx owned?");
13810 		}
13811 		if (mtx_owned(&stcb->tcb_send_mtx)) {
13812 			panic("Leaving with tcb send mtx owned?");
13813 		}
13814 	}
13815 #endif
13816 #ifdef INVARIANTS
13817 	if (inp) {
13818 		sctp_validate_no_locks(inp);
13819 	} else {
13820 		SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13821 	}
13822 #endif
13823 	if (top) {
13824 		sctp_m_freem(top);
13825 	}
13826 	if (control) {
13827 		sctp_m_freem(control);
13828 	}
13829 	return (error);
13830 }
13831 
13832 
13833 /*
13834  * generate an AUTHentication chunk, if required
13835  */
13836 struct mbuf *
13837 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13838     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13839     struct sctp_tcb *stcb, uint8_t chunk)
13840 {
13841 	struct mbuf *m_auth;
13842 	struct sctp_auth_chunk *auth;
13843 	int chunk_len;
13844 	struct mbuf *cn;
13845 
13846 	if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13847 	    (stcb == NULL))
13848 		return (m);
13849 
13850 	/* sysctl disabled auth? */
13851 	if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13852 		return (m);
13853 
13854 	/* peer doesn't do auth... */
13855 	if (!stcb->asoc.peer_supports_auth) {
13856 		return (m);
13857 	}
13858 	/* does the requested chunk require auth? */
13859 	if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13860 		return (m);
13861 	}
13862 	m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13863 	if (m_auth == NULL) {
13864 		/* no mbuf's */
13865 		return (m);
13866 	}
13867 	/* reserve some space if this will be the first mbuf */
13868 	if (m == NULL)
13869 		SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13870 	/* fill in the AUTH chunk details */
13871 	auth = mtod(m_auth, struct sctp_auth_chunk *);
13872 	bzero(auth, sizeof(*auth));
13873 	auth->ch.chunk_type = SCTP_AUTHENTICATION;
13874 	auth->ch.chunk_flags = 0;
13875 	chunk_len = sizeof(*auth) +
13876 	    sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13877 	auth->ch.chunk_length = htons(chunk_len);
13878 	auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13879 	/* key id and hmac digest will be computed and filled in upon send */
13880 
13881 	/* save the offset where the auth was inserted into the chain */
13882 	*offset = 0;
13883 	for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13884 		*offset += SCTP_BUF_LEN(cn);
13885 	}
13886 
13887 	/* update length and return pointer to the auth chunk */
13888 	SCTP_BUF_LEN(m_auth) = chunk_len;
13889 	m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13890 	if (auth_ret != NULL)
13891 		*auth_ret = auth;
13892 
13893 	return (m);
13894 }
13895 
13896 #ifdef INET6
13897 int
13898 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13899 {
13900 	struct nd_prefix *pfx = NULL;
13901 	struct nd_pfxrouter *pfxrtr = NULL;
13902 	struct sockaddr_in6 gw6;
13903 
13904 	if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13905 		return (0);
13906 
13907 	/* get prefix entry of address */
13908 	LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13909 		if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13910 			continue;
13911 		if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13912 		    &src6->sin6_addr, &pfx->ndpr_mask))
13913 			break;
13914 	}
13915 	/* no prefix entry in the prefix list */
13916 	if (pfx == NULL) {
13917 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13918 		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13919 		return (0);
13920 	}
13921 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13922 	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13923 
13924 	/* search installed gateway from prefix entry */
13925 	LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13926 		memset(&gw6, 0, sizeof(struct sockaddr_in6));
13927 		gw6.sin6_family = AF_INET6;
13928 		gw6.sin6_len = sizeof(struct sockaddr_in6);
13929 		memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13930 		    sizeof(struct in6_addr));
13931 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13932 		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13933 		SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13934 		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13935 		if (sctp_cmpaddr((struct sockaddr *)&gw6,
13936 		    ro->ro_rt->rt_gateway)) {
13937 			SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13938 			return (1);
13939 		}
13940 	}
13941 	SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13942 	return (0);
13943 }
13944 
13945 #endif
13946 
13947 int
13948 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13949 {
13950 #ifdef INET
13951 	struct sockaddr_in *sin, *mask;
13952 	struct ifaddr *ifa;
13953 	struct in_addr srcnetaddr, gwnetaddr;
13954 
13955 	if (ro == NULL || ro->ro_rt == NULL ||
13956 	    sifa->address.sa.sa_family != AF_INET) {
13957 		return (0);
13958 	}
13959 	ifa = (struct ifaddr *)sifa->ifa;
13960 	mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13961 	sin = (struct sockaddr_in *)&sifa->address.sin;
13962 	srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13963 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13964 	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13965 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13966 
13967 	sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13968 	gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13969 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13970 	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13971 	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13972 	if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13973 		return (1);
13974 	}
13975 #endif
13976 	return (0);
13977 }
13978