sctp_output.c revision 267799 
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: releng/9.3/sys/netinet/sctp_output.c 267799 2014-06-23 15:04:32Z tuexen $");
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
60struct 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
68struct 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
1864int
1865sctp_is_address_in_scope(struct sctp_ifa *ifa,
1866    struct sctp_scoping *scope,
1867    int do_update)
1868{
1869	if ((scope->loopback_scope == 0) &&
1870	    (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1871		/*
1872		 * skip loopback if not in scope *
1873		 */
1874		return (0);
1875	}
1876	switch (ifa->address.sa.sa_family) {
1877#ifdef INET
1878	case AF_INET:
1879		if (scope->ipv4_addr_legal) {
1880			struct sockaddr_in *sin;
1881
1882			sin = (struct sockaddr_in *)&ifa->address.sin;
1883			if (sin->sin_addr.s_addr == 0) {
1884				/* not in scope , unspecified */
1885				return (0);
1886			}
1887			if ((scope->ipv4_local_scope == 0) &&
1888			    (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1889				/* private address not in scope */
1890				return (0);
1891			}
1892		} else {
1893			return (0);
1894		}
1895		break;
1896#endif
1897#ifdef INET6
1898	case AF_INET6:
1899		if (scope->ipv6_addr_legal) {
1900			struct sockaddr_in6 *sin6;
1901
1902			/*
1903			 * Must update the flags,  bummer, which means any
1904			 * IFA locks must now be applied HERE <->
1905			 */
1906			if (do_update) {
1907				sctp_gather_internal_ifa_flags(ifa);
1908			}
1909			if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1910				return (0);
1911			}
1912			/* ok to use deprecated addresses? */
1913			sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1914			if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1915				/* skip unspecifed addresses */
1916				return (0);
1917			}
1918			if (	/* (local_scope == 0) && */
1919			    (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1920				return (0);
1921			}
1922			if ((scope->site_scope == 0) &&
1923			    (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1924				return (0);
1925			}
1926		} else {
1927			return (0);
1928		}
1929		break;
1930#endif
1931	default:
1932		return (0);
1933	}
1934	return (1);
1935}
1936
1937static struct mbuf *
1938sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t * len)
1939{
1940#if defined(INET) || defined(INET6)
1941	struct sctp_paramhdr *parmh;
1942	struct mbuf *mret;
1943	uint16_t plen;
1944
1945#endif
1946
1947	switch (ifa->address.sa.sa_family) {
1948#ifdef INET
1949	case AF_INET:
1950		plen = (uint16_t) sizeof(struct sctp_ipv4addr_param);
1951		break;
1952#endif
1953#ifdef INET6
1954	case AF_INET6:
1955		plen = (uint16_t) sizeof(struct sctp_ipv6addr_param);
1956		break;
1957#endif
1958	default:
1959		return (m);
1960	}
1961#if defined(INET) || defined(INET6)
1962	if (M_TRAILINGSPACE(m) >= plen) {
1963		/* easy side we just drop it on the end */
1964		parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1965		mret = m;
1966	} else {
1967		/* Need more space */
1968		mret = m;
1969		while (SCTP_BUF_NEXT(mret) != NULL) {
1970			mret = SCTP_BUF_NEXT(mret);
1971		}
1972		SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_DONTWAIT, 1, MT_DATA);
1973		if (SCTP_BUF_NEXT(mret) == NULL) {
1974			/* We are hosed, can't add more addresses */
1975			return (m);
1976		}
1977		mret = SCTP_BUF_NEXT(mret);
1978		parmh = mtod(mret, struct sctp_paramhdr *);
1979	}
1980	/* now add the parameter */
1981	switch (ifa->address.sa.sa_family) {
1982#ifdef INET
1983	case AF_INET:
1984		{
1985			struct sctp_ipv4addr_param *ipv4p;
1986			struct sockaddr_in *sin;
1987
1988			sin = (struct sockaddr_in *)&ifa->address.sin;
1989			ipv4p = (struct sctp_ipv4addr_param *)parmh;
1990			parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1991			parmh->param_length = htons(plen);
1992			ipv4p->addr = sin->sin_addr.s_addr;
1993			SCTP_BUF_LEN(mret) += plen;
1994			break;
1995		}
1996#endif
1997#ifdef INET6
1998	case AF_INET6:
1999		{
2000			struct sctp_ipv6addr_param *ipv6p;
2001			struct sockaddr_in6 *sin6;
2002
2003			sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2004			ipv6p = (struct sctp_ipv6addr_param *)parmh;
2005			parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2006			parmh->param_length = htons(plen);
2007			memcpy(ipv6p->addr, &sin6->sin6_addr,
2008			    sizeof(ipv6p->addr));
2009			/* clear embedded scope in the address */
2010			in6_clearscope((struct in6_addr *)ipv6p->addr);
2011			SCTP_BUF_LEN(mret) += plen;
2012			break;
2013		}
2014#endif
2015	default:
2016		return (m);
2017	}
2018	if (len != NULL) {
2019		*len += plen;
2020	}
2021	return (mret);
2022#endif
2023}
2024
2025
2026struct mbuf *
2027sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2028    struct sctp_scoping *scope,
2029    struct mbuf *m_at, int cnt_inits_to,
2030    uint16_t * padding_len, uint16_t * chunk_len)
2031{
2032	struct sctp_vrf *vrf = NULL;
2033	int cnt, limit_out = 0, total_count;
2034	uint32_t vrf_id;
2035
2036	vrf_id = inp->def_vrf_id;
2037	SCTP_IPI_ADDR_RLOCK();
2038	vrf = sctp_find_vrf(vrf_id);
2039	if (vrf == NULL) {
2040		SCTP_IPI_ADDR_RUNLOCK();
2041		return (m_at);
2042	}
2043	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2044		struct sctp_ifa *sctp_ifap;
2045		struct sctp_ifn *sctp_ifnp;
2046
2047		cnt = cnt_inits_to;
2048		if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2049			limit_out = 1;
2050			cnt = SCTP_ADDRESS_LIMIT;
2051			goto skip_count;
2052		}
2053		LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2054			if ((scope->loopback_scope == 0) &&
2055			    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2056				/*
2057				 * Skip loopback devices if loopback_scope
2058				 * not set
2059				 */
2060				continue;
2061			}
2062			LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2063#ifdef INET
2064				if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2065				    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2066				    &sctp_ifap->address.sin.sin_addr) != 0)) {
2067					continue;
2068				}
2069#endif
2070#ifdef INET6
2071				if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2072				    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2073				    &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2074					continue;
2075				}
2076#endif
2077				if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2078					continue;
2079				}
2080				if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2081					continue;
2082				}
2083				cnt++;
2084				if (cnt > SCTP_ADDRESS_LIMIT) {
2085					break;
2086				}
2087			}
2088			if (cnt > SCTP_ADDRESS_LIMIT) {
2089				break;
2090			}
2091		}
2092skip_count:
2093		if (cnt > 1) {
2094			total_count = 0;
2095			LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2096				cnt = 0;
2097				if ((scope->loopback_scope == 0) &&
2098				    SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2099					/*
2100					 * Skip loopback devices if
2101					 * loopback_scope not set
2102					 */
2103					continue;
2104				}
2105				LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2106#ifdef INET
2107					if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
2108					    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2109					    &sctp_ifap->address.sin.sin_addr) != 0)) {
2110						continue;
2111					}
2112#endif
2113#ifdef INET6
2114					if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
2115					    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2116					    &sctp_ifap->address.sin6.sin6_addr) != 0)) {
2117						continue;
2118					}
2119#endif
2120					if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2121						continue;
2122					}
2123					if (sctp_is_address_in_scope(sctp_ifap,
2124					    scope, 0) == 0) {
2125						continue;
2126					}
2127					if ((chunk_len != NULL) &&
2128					    (padding_len != NULL) &&
2129					    (*padding_len > 0)) {
2130						memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2131						SCTP_BUF_LEN(m_at) += *padding_len;
2132						*chunk_len += *padding_len;
2133						*padding_len = 0;
2134					}
2135					m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2136					if (limit_out) {
2137						cnt++;
2138						total_count++;
2139						if (cnt >= 2) {
2140							/*
2141							 * two from each
2142							 * address
2143							 */
2144							break;
2145						}
2146						if (total_count > SCTP_ADDRESS_LIMIT) {
2147							/* No more addresses */
2148							break;
2149						}
2150					}
2151				}
2152			}
2153		}
2154	} else {
2155		struct sctp_laddr *laddr;
2156
2157		cnt = cnt_inits_to;
2158		/* First, how many ? */
2159		LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2160			if (laddr->ifa == NULL) {
2161				continue;
2162			}
2163			if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2164				/*
2165				 * Address being deleted by the system, dont
2166				 * list.
2167				 */
2168				continue;
2169			if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2170				/*
2171				 * Address being deleted on this ep don't
2172				 * list.
2173				 */
2174				continue;
2175			}
2176			if (sctp_is_address_in_scope(laddr->ifa,
2177			    scope, 1) == 0) {
2178				continue;
2179			}
2180			cnt++;
2181		}
2182		/*
2183		 * To get through a NAT we only list addresses if we have
2184		 * more than one. That way if you just bind a single address
2185		 * we let the source of the init dictate our address.
2186		 */
2187		if (cnt > 1) {
2188			cnt = cnt_inits_to;
2189			LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2190				if (laddr->ifa == NULL) {
2191					continue;
2192				}
2193				if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2194					continue;
2195				}
2196				if (sctp_is_address_in_scope(laddr->ifa,
2197				    scope, 0) == 0) {
2198					continue;
2199				}
2200				if ((chunk_len != NULL) &&
2201				    (padding_len != NULL) &&
2202				    (*padding_len > 0)) {
2203					memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2204					SCTP_BUF_LEN(m_at) += *padding_len;
2205					*chunk_len += *padding_len;
2206					*padding_len = 0;
2207				}
2208				m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2209				cnt++;
2210				if (cnt >= SCTP_ADDRESS_LIMIT) {
2211					break;
2212				}
2213			}
2214		}
2215	}
2216	SCTP_IPI_ADDR_RUNLOCK();
2217	return (m_at);
2218}
2219
2220static struct sctp_ifa *
2221sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2222    uint8_t dest_is_loop,
2223    uint8_t dest_is_priv,
2224    sa_family_t fam)
2225{
2226	uint8_t dest_is_global = 0;
2227
2228	/* dest_is_priv is true if destination is a private address */
2229	/* dest_is_loop is true if destination is a loopback addresses */
2230
2231	/**
2232	 * Here we determine if its a preferred address. A preferred address
2233	 * means it is the same scope or higher scope then the destination.
2234	 * L = loopback, P = private, G = global
2235	 * -----------------------------------------
2236	 *    src    |  dest | result
2237	 *  ----------------------------------------
2238	 *     L     |    L  |    yes
2239	 *  -----------------------------------------
2240	 *     P     |    L  |    yes-v4 no-v6
2241	 *  -----------------------------------------
2242	 *     G     |    L  |    yes-v4 no-v6
2243	 *  -----------------------------------------
2244	 *     L     |    P  |    no
2245	 *  -----------------------------------------
2246	 *     P     |    P  |    yes
2247	 *  -----------------------------------------
2248	 *     G     |    P  |    no
2249	 *   -----------------------------------------
2250	 *     L     |    G  |    no
2251	 *   -----------------------------------------
2252	 *     P     |    G  |    no
2253	 *    -----------------------------------------
2254	 *     G     |    G  |    yes
2255	 *    -----------------------------------------
2256	 */
2257
2258	if (ifa->address.sa.sa_family != fam) {
2259		/* forget mis-matched family */
2260		return (NULL);
2261	}
2262	if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2263		dest_is_global = 1;
2264	}
2265	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2266	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2267	/* Ok the address may be ok */
2268#ifdef INET6
2269	if (fam == AF_INET6) {
2270		/* ok to use deprecated addresses? no lets not! */
2271		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2272			SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2273			return (NULL);
2274		}
2275		if (ifa->src_is_priv && !ifa->src_is_loop) {
2276			if (dest_is_loop) {
2277				SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2278				return (NULL);
2279			}
2280		}
2281		if (ifa->src_is_glob) {
2282			if (dest_is_loop) {
2283				SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2284				return (NULL);
2285			}
2286		}
2287	}
2288#endif
2289	/*
2290	 * Now that we know what is what, implement or table this could in
2291	 * theory be done slicker (it used to be), but this is
2292	 * straightforward and easier to validate :-)
2293	 */
2294	SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2295	    ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2296	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2297	    dest_is_loop, dest_is_priv, dest_is_global);
2298
2299	if ((ifa->src_is_loop) && (dest_is_priv)) {
2300		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2301		return (NULL);
2302	}
2303	if ((ifa->src_is_glob) && (dest_is_priv)) {
2304		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2305		return (NULL);
2306	}
2307	if ((ifa->src_is_loop) && (dest_is_global)) {
2308		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2309		return (NULL);
2310	}
2311	if ((ifa->src_is_priv) && (dest_is_global)) {
2312		SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2313		return (NULL);
2314	}
2315	SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2316	/* its a preferred address */
2317	return (ifa);
2318}
2319
2320static struct sctp_ifa *
2321sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2322    uint8_t dest_is_loop,
2323    uint8_t dest_is_priv,
2324    sa_family_t fam)
2325{
2326	uint8_t dest_is_global = 0;
2327
2328	/**
2329	 * Here we determine if its a acceptable address. A acceptable
2330	 * address means it is the same scope or higher scope but we can
2331	 * allow for NAT which means its ok to have a global dest and a
2332	 * private src.
2333	 *
2334	 * L = loopback, P = private, G = global
2335	 * -----------------------------------------
2336	 *  src    |  dest | result
2337	 * -----------------------------------------
2338	 *   L     |   L   |    yes
2339	 *  -----------------------------------------
2340	 *   P     |   L   |    yes-v4 no-v6
2341	 *  -----------------------------------------
2342	 *   G     |   L   |    yes
2343	 * -----------------------------------------
2344	 *   L     |   P   |    no
2345	 * -----------------------------------------
2346	 *   P     |   P   |    yes
2347	 * -----------------------------------------
2348	 *   G     |   P   |    yes - May not work
2349	 * -----------------------------------------
2350	 *   L     |   G   |    no
2351	 * -----------------------------------------
2352	 *   P     |   G   |    yes - May not work
2353	 * -----------------------------------------
2354	 *   G     |   G   |    yes
2355	 * -----------------------------------------
2356	 */
2357
2358	if (ifa->address.sa.sa_family != fam) {
2359		/* forget non matching family */
2360		SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2361		    ifa->address.sa.sa_family, fam);
2362		return (NULL);
2363	}
2364	/* Ok the address may be ok */
2365	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2366	SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2367	    dest_is_loop, dest_is_priv);
2368	if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2369		dest_is_global = 1;
2370	}
2371#ifdef INET6
2372	if (fam == AF_INET6) {
2373		/* ok to use deprecated addresses? */
2374		if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2375			return (NULL);
2376		}
2377		if (ifa->src_is_priv) {
2378			/* Special case, linklocal to loop */
2379			if (dest_is_loop)
2380				return (NULL);
2381		}
2382	}
2383#endif
2384	/*
2385	 * Now that we know what is what, implement our table. This could in
2386	 * theory be done slicker (it used to be), but this is
2387	 * straightforward and easier to validate :-)
2388	 */
2389	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2390	    ifa->src_is_loop,
2391	    dest_is_priv);
2392	if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2393		return (NULL);
2394	}
2395	SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2396	    ifa->src_is_loop,
2397	    dest_is_global);
2398	if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2399		return (NULL);
2400	}
2401	SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2402	/* its an acceptable address */
2403	return (ifa);
2404}
2405
2406int
2407sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2408{
2409	struct sctp_laddr *laddr;
2410
2411	if (stcb == NULL) {
2412		/* There are no restrictions, no TCB :-) */
2413		return (0);
2414	}
2415	LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2416		if (laddr->ifa == NULL) {
2417			SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2418			    __FUNCTION__);
2419			continue;
2420		}
2421		if (laddr->ifa == ifa) {
2422			/* Yes it is on the list */
2423			return (1);
2424		}
2425	}
2426	return (0);
2427}
2428
2429
2430int
2431sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2432{
2433	struct sctp_laddr *laddr;
2434
2435	if (ifa == NULL)
2436		return (0);
2437	LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2438		if (laddr->ifa == NULL) {
2439			SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2440			    __FUNCTION__);
2441			continue;
2442		}
2443		if ((laddr->ifa == ifa) && laddr->action == 0)
2444			/* same pointer */
2445			return (1);
2446	}
2447	return (0);
2448}
2449
2450
2451
2452static struct sctp_ifa *
2453sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2454    sctp_route_t * ro,
2455    uint32_t vrf_id,
2456    int non_asoc_addr_ok,
2457    uint8_t dest_is_priv,
2458    uint8_t dest_is_loop,
2459    sa_family_t fam)
2460{
2461	struct sctp_laddr *laddr, *starting_point;
2462	void *ifn;
2463	int resettotop = 0;
2464	struct sctp_ifn *sctp_ifn;
2465	struct sctp_ifa *sctp_ifa, *sifa;
2466	struct sctp_vrf *vrf;
2467	uint32_t ifn_index;
2468
2469	vrf = sctp_find_vrf(vrf_id);
2470	if (vrf == NULL)
2471		return (NULL);
2472
2473	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2474	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2475	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2476	/*
2477	 * first question, is the ifn we will emit on in our list, if so, we
2478	 * want such an address. Note that we first looked for a preferred
2479	 * address.
2480	 */
2481	if (sctp_ifn) {
2482		/* is a preferred one on the interface we route out? */
2483		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2484#ifdef INET
2485			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2486			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2487			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2488				continue;
2489			}
2490#endif
2491#ifdef INET6
2492			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2493			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2494			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2495				continue;
2496			}
2497#endif
2498			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2499			    (non_asoc_addr_ok == 0))
2500				continue;
2501			sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2502			    dest_is_loop,
2503			    dest_is_priv, fam);
2504			if (sifa == NULL)
2505				continue;
2506			if (sctp_is_addr_in_ep(inp, sifa)) {
2507				atomic_add_int(&sifa->refcount, 1);
2508				return (sifa);
2509			}
2510		}
2511	}
2512	/*
2513	 * ok, now we now need to find one on the list of the addresses. We
2514	 * can't get one on the emitting interface so let's find first a
2515	 * preferred one. If not that an acceptable one otherwise... we
2516	 * return NULL.
2517	 */
2518	starting_point = inp->next_addr_touse;
2519once_again:
2520	if (inp->next_addr_touse == NULL) {
2521		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2522		resettotop = 1;
2523	}
2524	for (laddr = inp->next_addr_touse; laddr;
2525	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2526		if (laddr->ifa == NULL) {
2527			/* address has been removed */
2528			continue;
2529		}
2530		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2531			/* address is being deleted */
2532			continue;
2533		}
2534		sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2535		    dest_is_priv, fam);
2536		if (sifa == NULL)
2537			continue;
2538		atomic_add_int(&sifa->refcount, 1);
2539		return (sifa);
2540	}
2541	if (resettotop == 0) {
2542		inp->next_addr_touse = NULL;
2543		goto once_again;
2544	}
2545	inp->next_addr_touse = starting_point;
2546	resettotop = 0;
2547once_again_too:
2548	if (inp->next_addr_touse == NULL) {
2549		inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2550		resettotop = 1;
2551	}
2552	/* ok, what about an acceptable address in the inp */
2553	for (laddr = inp->next_addr_touse; laddr;
2554	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2555		if (laddr->ifa == NULL) {
2556			/* address has been removed */
2557			continue;
2558		}
2559		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2560			/* address is being deleted */
2561			continue;
2562		}
2563		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2564		    dest_is_priv, fam);
2565		if (sifa == NULL)
2566			continue;
2567		atomic_add_int(&sifa->refcount, 1);
2568		return (sifa);
2569	}
2570	if (resettotop == 0) {
2571		inp->next_addr_touse = NULL;
2572		goto once_again_too;
2573	}
2574	/*
2575	 * no address bound can be a source for the destination we are in
2576	 * trouble
2577	 */
2578	return (NULL);
2579}
2580
2581
2582
2583static struct sctp_ifa *
2584sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2585    struct sctp_tcb *stcb,
2586    sctp_route_t * ro,
2587    uint32_t vrf_id,
2588    uint8_t dest_is_priv,
2589    uint8_t dest_is_loop,
2590    int non_asoc_addr_ok,
2591    sa_family_t fam)
2592{
2593	struct sctp_laddr *laddr, *starting_point;
2594	void *ifn;
2595	struct sctp_ifn *sctp_ifn;
2596	struct sctp_ifa *sctp_ifa, *sifa;
2597	uint8_t start_at_beginning = 0;
2598	struct sctp_vrf *vrf;
2599	uint32_t ifn_index;
2600
2601	/*
2602	 * first question, is the ifn we will emit on in our list, if so, we
2603	 * want that one.
2604	 */
2605	vrf = sctp_find_vrf(vrf_id);
2606	if (vrf == NULL)
2607		return (NULL);
2608
2609	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2610	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2611	sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2612
2613	/*
2614	 * first question, is the ifn we will emit on in our list?  If so,
2615	 * we want that one. First we look for a preferred. Second, we go
2616	 * for an acceptable.
2617	 */
2618	if (sctp_ifn) {
2619		/* first try for a preferred address on the ep */
2620		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2621#ifdef INET
2622			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2623			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2624			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2625				continue;
2626			}
2627#endif
2628#ifdef INET6
2629			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2630			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2631			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2632				continue;
2633			}
2634#endif
2635			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2636				continue;
2637			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2638				sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2639				if (sifa == NULL)
2640					continue;
2641				if (((non_asoc_addr_ok == 0) &&
2642				    (sctp_is_addr_restricted(stcb, sifa))) ||
2643				    (non_asoc_addr_ok &&
2644				    (sctp_is_addr_restricted(stcb, sifa)) &&
2645				    (!sctp_is_addr_pending(stcb, sifa)))) {
2646					/* on the no-no list */
2647					continue;
2648				}
2649				atomic_add_int(&sifa->refcount, 1);
2650				return (sifa);
2651			}
2652		}
2653		/* next try for an acceptable address on the ep */
2654		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2655#ifdef INET
2656			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
2657			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2658			    &sctp_ifa->address.sin.sin_addr) != 0)) {
2659				continue;
2660			}
2661#endif
2662#ifdef INET6
2663			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
2664			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2665			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
2666				continue;
2667			}
2668#endif
2669			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2670				continue;
2671			if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2672				sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2673				if (sifa == NULL)
2674					continue;
2675				if (((non_asoc_addr_ok == 0) &&
2676				    (sctp_is_addr_restricted(stcb, sifa))) ||
2677				    (non_asoc_addr_ok &&
2678				    (sctp_is_addr_restricted(stcb, sifa)) &&
2679				    (!sctp_is_addr_pending(stcb, sifa)))) {
2680					/* on the no-no list */
2681					continue;
2682				}
2683				atomic_add_int(&sifa->refcount, 1);
2684				return (sifa);
2685			}
2686		}
2687
2688	}
2689	/*
2690	 * if we can't find one like that then we must look at all addresses
2691	 * bound to pick one at first preferable then secondly acceptable.
2692	 */
2693	starting_point = stcb->asoc.last_used_address;
2694sctp_from_the_top:
2695	if (stcb->asoc.last_used_address == NULL) {
2696		start_at_beginning = 1;
2697		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2698	}
2699	/* search beginning with the last used address */
2700	for (laddr = stcb->asoc.last_used_address; laddr;
2701	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2702		if (laddr->ifa == NULL) {
2703			/* address has been removed */
2704			continue;
2705		}
2706		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2707			/* address is being deleted */
2708			continue;
2709		}
2710		sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2711		if (sifa == NULL)
2712			continue;
2713		if (((non_asoc_addr_ok == 0) &&
2714		    (sctp_is_addr_restricted(stcb, sifa))) ||
2715		    (non_asoc_addr_ok &&
2716		    (sctp_is_addr_restricted(stcb, sifa)) &&
2717		    (!sctp_is_addr_pending(stcb, sifa)))) {
2718			/* on the no-no list */
2719			continue;
2720		}
2721		stcb->asoc.last_used_address = laddr;
2722		atomic_add_int(&sifa->refcount, 1);
2723		return (sifa);
2724	}
2725	if (start_at_beginning == 0) {
2726		stcb->asoc.last_used_address = NULL;
2727		goto sctp_from_the_top;
2728	}
2729	/* now try for any higher scope than the destination */
2730	stcb->asoc.last_used_address = starting_point;
2731	start_at_beginning = 0;
2732sctp_from_the_top2:
2733	if (stcb->asoc.last_used_address == NULL) {
2734		start_at_beginning = 1;
2735		stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2736	}
2737	/* search beginning with the last used address */
2738	for (laddr = stcb->asoc.last_used_address; laddr;
2739	    laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2740		if (laddr->ifa == NULL) {
2741			/* address has been removed */
2742			continue;
2743		}
2744		if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2745			/* address is being deleted */
2746			continue;
2747		}
2748		sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2749		    dest_is_priv, fam);
2750		if (sifa == NULL)
2751			continue;
2752		if (((non_asoc_addr_ok == 0) &&
2753		    (sctp_is_addr_restricted(stcb, sifa))) ||
2754		    (non_asoc_addr_ok &&
2755		    (sctp_is_addr_restricted(stcb, sifa)) &&
2756		    (!sctp_is_addr_pending(stcb, sifa)))) {
2757			/* on the no-no list */
2758			continue;
2759		}
2760		stcb->asoc.last_used_address = laddr;
2761		atomic_add_int(&sifa->refcount, 1);
2762		return (sifa);
2763	}
2764	if (start_at_beginning == 0) {
2765		stcb->asoc.last_used_address = NULL;
2766		goto sctp_from_the_top2;
2767	}
2768	return (NULL);
2769}
2770
2771static struct sctp_ifa *
2772sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2773    struct sctp_inpcb *inp,
2774    struct sctp_tcb *stcb,
2775    int non_asoc_addr_ok,
2776    uint8_t dest_is_loop,
2777    uint8_t dest_is_priv,
2778    int addr_wanted,
2779    sa_family_t fam,
2780    sctp_route_t * ro
2781)
2782{
2783	struct sctp_ifa *ifa, *sifa;
2784	int num_eligible_addr = 0;
2785
2786#ifdef INET6
2787	struct sockaddr_in6 sin6, lsa6;
2788
2789	if (fam == AF_INET6) {
2790		memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2791		(void)sa6_recoverscope(&sin6);
2792	}
2793#endif				/* INET6 */
2794	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2795#ifdef INET
2796		if ((ifa->address.sa.sa_family == AF_INET) &&
2797		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2798		    &ifa->address.sin.sin_addr) != 0)) {
2799			continue;
2800		}
2801#endif
2802#ifdef INET6
2803		if ((ifa->address.sa.sa_family == AF_INET6) &&
2804		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2805		    &ifa->address.sin6.sin6_addr) != 0)) {
2806			continue;
2807		}
2808#endif
2809		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2810		    (non_asoc_addr_ok == 0))
2811			continue;
2812		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2813		    dest_is_priv, fam);
2814		if (sifa == NULL)
2815			continue;
2816#ifdef INET6
2817		if (fam == AF_INET6 &&
2818		    dest_is_loop &&
2819		    sifa->src_is_loop && sifa->src_is_priv) {
2820			/*
2821			 * don't allow fe80::1 to be a src on loop ::1, we
2822			 * don't list it to the peer so we will get an
2823			 * abort.
2824			 */
2825			continue;
2826		}
2827		if (fam == AF_INET6 &&
2828		    IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2829		    IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2830			/*
2831			 * link-local <-> link-local must belong to the same
2832			 * scope.
2833			 */
2834			memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2835			(void)sa6_recoverscope(&lsa6);
2836			if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2837				continue;
2838			}
2839		}
2840#endif				/* INET6 */
2841
2842		/*
2843		 * Check if the IPv6 address matches to next-hop. In the
2844		 * mobile case, old IPv6 address may be not deleted from the
2845		 * interface. Then, the interface has previous and new
2846		 * addresses.  We should use one corresponding to the
2847		 * next-hop.  (by micchie)
2848		 */
2849#ifdef INET6
2850		if (stcb && fam == AF_INET6 &&
2851		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2852			if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2853			    == 0) {
2854				continue;
2855			}
2856		}
2857#endif
2858#ifdef INET
2859		/* Avoid topologically incorrect IPv4 address */
2860		if (stcb && fam == AF_INET &&
2861		    sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2862			if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2863				continue;
2864			}
2865		}
2866#endif
2867		if (stcb) {
2868			if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2869				continue;
2870			}
2871			if (((non_asoc_addr_ok == 0) &&
2872			    (sctp_is_addr_restricted(stcb, sifa))) ||
2873			    (non_asoc_addr_ok &&
2874			    (sctp_is_addr_restricted(stcb, sifa)) &&
2875			    (!sctp_is_addr_pending(stcb, sifa)))) {
2876				/*
2877				 * It is restricted for some reason..
2878				 * probably not yet added.
2879				 */
2880				continue;
2881			}
2882		}
2883		if (num_eligible_addr >= addr_wanted) {
2884			return (sifa);
2885		}
2886		num_eligible_addr++;
2887	}
2888	return (NULL);
2889}
2890
2891
2892static int
2893sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2894    struct sctp_inpcb *inp,
2895    struct sctp_tcb *stcb,
2896    int non_asoc_addr_ok,
2897    uint8_t dest_is_loop,
2898    uint8_t dest_is_priv,
2899    sa_family_t fam)
2900{
2901	struct sctp_ifa *ifa, *sifa;
2902	int num_eligible_addr = 0;
2903
2904	LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2905#ifdef INET
2906		if ((ifa->address.sa.sa_family == AF_INET) &&
2907		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
2908		    &ifa->address.sin.sin_addr) != 0)) {
2909			continue;
2910		}
2911#endif
2912#ifdef INET6
2913		if ((ifa->address.sa.sa_family == AF_INET6) &&
2914		    (stcb != NULL) &&
2915		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
2916		    &ifa->address.sin6.sin6_addr) != 0)) {
2917			continue;
2918		}
2919#endif
2920		if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2921		    (non_asoc_addr_ok == 0)) {
2922			continue;
2923		}
2924		sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2925		    dest_is_priv, fam);
2926		if (sifa == NULL) {
2927			continue;
2928		}
2929		if (stcb) {
2930			if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2931				continue;
2932			}
2933			if (((non_asoc_addr_ok == 0) &&
2934			    (sctp_is_addr_restricted(stcb, sifa))) ||
2935			    (non_asoc_addr_ok &&
2936			    (sctp_is_addr_restricted(stcb, sifa)) &&
2937			    (!sctp_is_addr_pending(stcb, sifa)))) {
2938				/*
2939				 * It is restricted for some reason..
2940				 * probably not yet added.
2941				 */
2942				continue;
2943			}
2944		}
2945		num_eligible_addr++;
2946	}
2947	return (num_eligible_addr);
2948}
2949
2950static struct sctp_ifa *
2951sctp_choose_boundall(struct sctp_inpcb *inp,
2952    struct sctp_tcb *stcb,
2953    struct sctp_nets *net,
2954    sctp_route_t * ro,
2955    uint32_t vrf_id,
2956    uint8_t dest_is_priv,
2957    uint8_t dest_is_loop,
2958    int non_asoc_addr_ok,
2959    sa_family_t fam)
2960{
2961	int cur_addr_num = 0, num_preferred = 0;
2962	void *ifn;
2963	struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2964	struct sctp_ifa *sctp_ifa, *sifa;
2965	uint32_t ifn_index;
2966	struct sctp_vrf *vrf;
2967
2968#ifdef INET
2969	int retried = 0;
2970
2971#endif
2972
2973	/*-
2974	 * For boundall we can use any address in the association.
2975	 * If non_asoc_addr_ok is set we can use any address (at least in
2976	 * theory). So we look for preferred addresses first. If we find one,
2977	 * we use it. Otherwise we next try to get an address on the
2978	 * interface, which we should be able to do (unless non_asoc_addr_ok
2979	 * is false and we are routed out that way). In these cases where we
2980	 * can't use the address of the interface we go through all the
2981	 * ifn's looking for an address we can use and fill that in. Punting
2982	 * means we send back address 0, which will probably cause problems
2983	 * actually since then IP will fill in the address of the route ifn,
2984	 * which means we probably already rejected it.. i.e. here comes an
2985	 * abort :-<.
2986	 */
2987	vrf = sctp_find_vrf(vrf_id);
2988	if (vrf == NULL)
2989		return (NULL);
2990
2991	ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2992	ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2993	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2994	emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2995	if (sctp_ifn == NULL) {
2996		/* ?? We don't have this guy ?? */
2997		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2998		goto bound_all_plan_b;
2999	}
3000	SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
3001	    ifn_index, sctp_ifn->ifn_name);
3002
3003	if (net) {
3004		cur_addr_num = net->indx_of_eligible_next_to_use;
3005	}
3006	num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
3007	    inp, stcb,
3008	    non_asoc_addr_ok,
3009	    dest_is_loop,
3010	    dest_is_priv, fam);
3011	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
3012	    num_preferred, sctp_ifn->ifn_name);
3013	if (num_preferred == 0) {
3014		/*
3015		 * no eligible addresses, we must use some other interface
3016		 * address if we can find one.
3017		 */
3018		goto bound_all_plan_b;
3019	}
3020	/*
3021	 * Ok we have num_eligible_addr set with how many we can use, this
3022	 * may vary from call to call due to addresses being deprecated
3023	 * etc..
3024	 */
3025	if (cur_addr_num >= num_preferred) {
3026		cur_addr_num = 0;
3027	}
3028	/*
3029	 * select the nth address from the list (where cur_addr_num is the
3030	 * nth) and 0 is the first one, 1 is the second one etc...
3031	 */
3032	SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
3033
3034	sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3035	    dest_is_priv, cur_addr_num, fam, ro);
3036
3037	/* if sctp_ifa is NULL something changed??, fall to plan b. */
3038	if (sctp_ifa) {
3039		atomic_add_int(&sctp_ifa->refcount, 1);
3040		if (net) {
3041			/* save off where the next one we will want */
3042			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3043		}
3044		return (sctp_ifa);
3045	}
3046	/*
3047	 * plan_b: Look at all interfaces and find a preferred address. If
3048	 * no preferred fall through to plan_c.
3049	 */
3050bound_all_plan_b:
3051	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
3052	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3053		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
3054		    sctp_ifn->ifn_name);
3055		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3056			/* wrong base scope */
3057			SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
3058			continue;
3059		}
3060		if ((sctp_ifn == looked_at) && looked_at) {
3061			/* already looked at this guy */
3062			SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
3063			continue;
3064		}
3065		num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
3066		    dest_is_loop, dest_is_priv, fam);
3067		SCTPDBG(SCTP_DEBUG_OUTPUT2,
3068		    "Found ifn:%p %d preferred source addresses\n",
3069		    ifn, num_preferred);
3070		if (num_preferred == 0) {
3071			/* None on this interface. */
3072			SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
3073			continue;
3074		}
3075		SCTPDBG(SCTP_DEBUG_OUTPUT2,
3076		    "num preferred:%d on interface:%p cur_addr_num:%d\n",
3077		    num_preferred, (void *)sctp_ifn, cur_addr_num);
3078
3079		/*
3080		 * Ok we have num_eligible_addr set with how many we can
3081		 * use, this may vary from call to call due to addresses
3082		 * being deprecated etc..
3083		 */
3084		if (cur_addr_num >= num_preferred) {
3085			cur_addr_num = 0;
3086		}
3087		sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
3088		    dest_is_priv, cur_addr_num, fam, ro);
3089		if (sifa == NULL)
3090			continue;
3091		if (net) {
3092			net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3093			SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3094			    cur_addr_num);
3095			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3096			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3097			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3098			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3099		}
3100		atomic_add_int(&sifa->refcount, 1);
3101		return (sifa);
3102	}
3103#ifdef INET
3104again_with_private_addresses_allowed:
3105#endif
3106	/* plan_c: do we have an acceptable address on the emit interface */
3107	sifa = NULL;
3108	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3109	if (emit_ifn == NULL) {
3110		SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3111		goto plan_d;
3112	}
3113	LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3114		SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3115#ifdef INET
3116		if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3117		    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3118		    &sctp_ifa->address.sin.sin_addr) != 0)) {
3119			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3120			continue;
3121		}
3122#endif
3123#ifdef INET6
3124		if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3125		    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3126		    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3127			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
3128			continue;
3129		}
3130#endif
3131		if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3132		    (non_asoc_addr_ok == 0)) {
3133			SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3134			continue;
3135		}
3136		sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3137		    dest_is_priv, fam);
3138		if (sifa == NULL) {
3139			SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3140			continue;
3141		}
3142		if (stcb) {
3143			if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3144				SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3145				sifa = NULL;
3146				continue;
3147			}
3148			if (((non_asoc_addr_ok == 0) &&
3149			    (sctp_is_addr_restricted(stcb, sifa))) ||
3150			    (non_asoc_addr_ok &&
3151			    (sctp_is_addr_restricted(stcb, sifa)) &&
3152			    (!sctp_is_addr_pending(stcb, sifa)))) {
3153				/*
3154				 * It is restricted for some reason..
3155				 * probably not yet added.
3156				 */
3157				SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3158				sifa = NULL;
3159				continue;
3160			}
3161		} else {
3162			SCTP_PRINTF("Stcb is null - no print\n");
3163		}
3164		atomic_add_int(&sifa->refcount, 1);
3165		goto out;
3166	}
3167plan_d:
3168	/*
3169	 * plan_d: We are in trouble. No preferred address on the emit
3170	 * interface. And not even a preferred address on all interfaces. Go
3171	 * out and see if we can find an acceptable address somewhere
3172	 * amongst all interfaces.
3173	 */
3174	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3175	LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3176		if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3177			/* wrong base scope */
3178			continue;
3179		}
3180		LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3181#ifdef INET
3182			if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3183			    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3184			    &sctp_ifa->address.sin.sin_addr) != 0)) {
3185				continue;
3186			}
3187#endif
3188#ifdef INET6
3189			if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3190			    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3191			    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3192				continue;
3193			}
3194#endif
3195			if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3196			    (non_asoc_addr_ok == 0))
3197				continue;
3198			sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3199			    dest_is_loop,
3200			    dest_is_priv, fam);
3201			if (sifa == NULL)
3202				continue;
3203			if (stcb) {
3204				if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3205					sifa = NULL;
3206					continue;
3207				}
3208				if (((non_asoc_addr_ok == 0) &&
3209				    (sctp_is_addr_restricted(stcb, sifa))) ||
3210				    (non_asoc_addr_ok &&
3211				    (sctp_is_addr_restricted(stcb, sifa)) &&
3212				    (!sctp_is_addr_pending(stcb, sifa)))) {
3213					/*
3214					 * It is restricted for some
3215					 * reason.. probably not yet added.
3216					 */
3217					sifa = NULL;
3218					continue;
3219				}
3220			}
3221			goto out;
3222		}
3223	}
3224#ifdef INET
3225	if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3226		stcb->asoc.scope.ipv4_local_scope = 1;
3227		retried = 1;
3228		goto again_with_private_addresses_allowed;
3229	} else if (retried == 1) {
3230		stcb->asoc.scope.ipv4_local_scope = 0;
3231	}
3232#endif
3233out:
3234#ifdef INET
3235	if (sifa) {
3236		if (retried == 1) {
3237			LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3238				if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3239					/* wrong base scope */
3240					continue;
3241				}
3242				LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3243					struct sctp_ifa *tmp_sifa;
3244
3245#ifdef INET
3246					if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
3247					    (prison_check_ip4(inp->ip_inp.inp.inp_cred,
3248					    &sctp_ifa->address.sin.sin_addr) != 0)) {
3249						continue;
3250					}
3251#endif
3252#ifdef INET6
3253					if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
3254					    (prison_check_ip6(inp->ip_inp.inp.inp_cred,
3255					    &sctp_ifa->address.sin6.sin6_addr) != 0)) {
3256						continue;
3257					}
3258#endif
3259					if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3260					    (non_asoc_addr_ok == 0))
3261						continue;
3262					tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3263					    dest_is_loop,
3264					    dest_is_priv, fam);
3265					if (tmp_sifa == NULL) {
3266						continue;
3267					}
3268					if (tmp_sifa == sifa) {
3269						continue;
3270					}
3271					if (stcb) {
3272						if (sctp_is_address_in_scope(tmp_sifa,
3273						    &stcb->asoc.scope, 0) == 0) {
3274							continue;
3275						}
3276						if (((non_asoc_addr_ok == 0) &&
3277						    (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3278						    (non_asoc_addr_ok &&
3279						    (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3280						    (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3281							/*
3282							 * It is restricted
3283							 * for some reason..
3284							 * probably not yet
3285							 * added.
3286							 */
3287							continue;
3288						}
3289					}
3290					if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3291					    (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3292						sctp_add_local_addr_restricted(stcb, tmp_sifa);
3293					}
3294				}
3295			}
3296		}
3297		atomic_add_int(&sifa->refcount, 1);
3298	}
3299#endif
3300	return (sifa);
3301}
3302
3303
3304
3305/* tcb may be NULL */
3306struct sctp_ifa *
3307sctp_source_address_selection(struct sctp_inpcb *inp,
3308    struct sctp_tcb *stcb,
3309    sctp_route_t * ro,
3310    struct sctp_nets *net,
3311    int non_asoc_addr_ok, uint32_t vrf_id)
3312{
3313	struct sctp_ifa *answer;
3314	uint8_t dest_is_priv, dest_is_loop;
3315	sa_family_t fam;
3316
3317#ifdef INET
3318	struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3319
3320#endif
3321#ifdef INET6
3322	struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3323
3324#endif
3325
3326	/**
3327	 * Rules: - Find the route if needed, cache if I can. - Look at
3328	 * interface address in route, Is it in the bound list. If so we
3329	 * have the best source. - If not we must rotate amongst the
3330	 * addresses.
3331	 *
3332	 * Cavets and issues
3333	 *
3334	 * Do we need to pay attention to scope. We can have a private address
3335	 * or a global address we are sourcing or sending to. So if we draw
3336	 * it out
3337	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3338	 * For V4
3339	 * ------------------------------------------
3340	 *      source     *      dest  *  result
3341	 * -----------------------------------------
3342	 * <a>  Private    *    Global  *  NAT
3343	 * -----------------------------------------
3344	 * <b>  Private    *    Private *  No problem
3345	 * -----------------------------------------
3346	 * <c>  Global     *    Private *  Huh, How will this work?
3347	 * -----------------------------------------
3348	 * <d>  Global     *    Global  *  No Problem
3349	 *------------------------------------------
3350	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3351	 * For V6
3352	 *------------------------------------------
3353	 *      source     *      dest  *  result
3354	 * -----------------------------------------
3355	 * <a>  Linklocal  *    Global  *
3356	 * -----------------------------------------
3357	 * <b>  Linklocal  * Linklocal  *  No problem
3358	 * -----------------------------------------
3359	 * <c>  Global     * Linklocal  *  Huh, How will this work?
3360	 * -----------------------------------------
3361	 * <d>  Global     *    Global  *  No Problem
3362	 *------------------------------------------
3363	 * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3364	 *
3365	 * And then we add to that what happens if there are multiple addresses
3366	 * assigned to an interface. Remember the ifa on a ifn is a linked
3367	 * list of addresses. So one interface can have more than one IP
3368	 * address. What happens if we have both a private and a global
3369	 * address? Do we then use context of destination to sort out which
3370	 * one is best? And what about NAT's sending P->G may get you a NAT
3371	 * translation, or should you select the G thats on the interface in
3372	 * preference.
3373	 *
3374	 * Decisions:
3375	 *
3376	 * - count the number of addresses on the interface.
3377	 * - if it is one, no problem except case <c>.
3378	 *   For <a> we will assume a NAT out there.
3379	 * - if there are more than one, then we need to worry about scope P
3380	 *   or G. We should prefer G -> G and P -> P if possible.
3381	 *   Then as a secondary fall back to mixed types G->P being a last
3382	 *   ditch one.
3383	 * - The above all works for bound all, but bound specific we need to
3384	 *   use the same concept but instead only consider the bound
3385	 *   addresses. If the bound set is NOT assigned to the interface then
3386	 *   we must use rotation amongst the bound addresses..
3387	 */
3388	if (ro->ro_rt == NULL) {
3389		/*
3390		 * Need a route to cache.
3391		 */
3392		SCTP_RTALLOC(ro, vrf_id);
3393	}
3394	if (ro->ro_rt == NULL) {
3395		return (NULL);
3396	}
3397	fam = ro->ro_dst.sa_family;
3398	dest_is_priv = dest_is_loop = 0;
3399	/* Setup our scopes for the destination */
3400	switch (fam) {
3401#ifdef INET
3402	case AF_INET:
3403		/* Scope based on outbound address */
3404		if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3405			dest_is_loop = 1;
3406			if (net != NULL) {
3407				/* mark it as local */
3408				net->addr_is_local = 1;
3409			}
3410		} else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3411			dest_is_priv = 1;
3412		}
3413		break;
3414#endif
3415#ifdef INET6
3416	case AF_INET6:
3417		/* Scope based on outbound address */
3418		if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3419		    SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3420			/*
3421			 * If the address is a loopback address, which
3422			 * consists of "::1" OR "fe80::1%lo0", we are
3423			 * loopback scope. But we don't use dest_is_priv
3424			 * (link local addresses).
3425			 */
3426			dest_is_loop = 1;
3427			if (net != NULL) {
3428				/* mark it as local */
3429				net->addr_is_local = 1;
3430			}
3431		} else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3432			dest_is_priv = 1;
3433		}
3434		break;
3435#endif
3436	}
3437	SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3438	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3439	SCTP_IPI_ADDR_RLOCK();
3440	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3441		/*
3442		 * Bound all case
3443		 */
3444		answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
3445		    dest_is_priv, dest_is_loop,
3446		    non_asoc_addr_ok, fam);
3447		SCTP_IPI_ADDR_RUNLOCK();
3448		return (answer);
3449	}
3450	/*
3451	 * Subset bound case
3452	 */
3453	if (stcb) {
3454		answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3455		    vrf_id, dest_is_priv,
3456		    dest_is_loop,
3457		    non_asoc_addr_ok, fam);
3458	} else {
3459		answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3460		    non_asoc_addr_ok,
3461		    dest_is_priv,
3462		    dest_is_loop, fam);
3463	}
3464	SCTP_IPI_ADDR_RUNLOCK();
3465	return (answer);
3466}
3467
3468static int
3469sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3470{
3471	struct cmsghdr cmh;
3472	int tlen, at, found;
3473	struct sctp_sndinfo sndinfo;
3474	struct sctp_prinfo prinfo;
3475	struct sctp_authinfo authinfo;
3476
3477	tlen = SCTP_BUF_LEN(control);
3478	at = 0;
3479	found = 0;
3480	/*
3481	 * Independent of how many mbufs, find the c_type inside the control
3482	 * structure and copy out the data.
3483	 */
3484	while (at < tlen) {
3485		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3486			/* There is not enough room for one more. */
3487			return (found);
3488		}
3489		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3490		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3491			/* We dont't have a complete CMSG header. */
3492			return (found);
3493		}
3494		if (((int)cmh.cmsg_len + at) > tlen) {
3495			/* We don't have the complete CMSG. */
3496			return (found);
3497		}
3498		if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3499		    ((c_type == cmh.cmsg_type) ||
3500		    ((c_type == SCTP_SNDRCV) &&
3501		    ((cmh.cmsg_type == SCTP_SNDINFO) ||
3502		    (cmh.cmsg_type == SCTP_PRINFO) ||
3503		    (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3504			if (c_type == cmh.cmsg_type) {
3505				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3506					return (found);
3507				}
3508				/* It is exactly what we want. Copy it out. */
3509				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), cpsize, (caddr_t)data);
3510				return (1);
3511			} else {
3512				struct sctp_sndrcvinfo *sndrcvinfo;
3513
3514				sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3515				if (found == 0) {
3516					if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3517						return (found);
3518					}
3519					memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3520				}
3521				switch (cmh.cmsg_type) {
3522				case SCTP_SNDINFO:
3523					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3524						return (found);
3525					}
3526					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3527					sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3528					sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3529					sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3530					sndrcvinfo->sinfo_context = sndinfo.snd_context;
3531					sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3532					break;
3533				case SCTP_PRINFO:
3534					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3535						return (found);
3536					}
3537					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3538					if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
3539						sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3540					} else {
3541						sndrcvinfo->sinfo_timetolive = 0;
3542					}
3543					sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3544					break;
3545				case SCTP_AUTHINFO:
3546					if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3547						return (found);
3548					}
3549					m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3550					sndrcvinfo->sinfo_keynumber_valid = 1;
3551					sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3552					break;
3553				default:
3554					return (found);
3555				}
3556				found = 1;
3557			}
3558		}
3559		at += CMSG_ALIGN(cmh.cmsg_len);
3560	}
3561	return (found);
3562}
3563
3564static int
3565sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3566{
3567	struct cmsghdr cmh;
3568	int tlen, at;
3569	struct sctp_initmsg initmsg;
3570
3571#ifdef INET
3572	struct sockaddr_in sin;
3573
3574#endif
3575#ifdef INET6
3576	struct sockaddr_in6 sin6;
3577
3578#endif
3579
3580	tlen = SCTP_BUF_LEN(control);
3581	at = 0;
3582	while (at < tlen) {
3583		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3584			/* There is not enough room for one more. */
3585			*error = EINVAL;
3586			return (1);
3587		}
3588		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3589		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3590			/* We dont't have a complete CMSG header. */
3591			*error = EINVAL;
3592			return (1);
3593		}
3594		if (((int)cmh.cmsg_len + at) > tlen) {
3595			/* We don't have the complete CMSG. */
3596			*error = EINVAL;
3597			return (1);
3598		}
3599		if (cmh.cmsg_level == IPPROTO_SCTP) {
3600			switch (cmh.cmsg_type) {
3601			case SCTP_INIT:
3602				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3603					*error = EINVAL;
3604					return (1);
3605				}
3606				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3607				if (initmsg.sinit_max_attempts)
3608					stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3609				if (initmsg.sinit_num_ostreams)
3610					stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3611				if (initmsg.sinit_max_instreams)
3612					stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3613				if (initmsg.sinit_max_init_timeo)
3614					stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3615				if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3616					struct sctp_stream_out *tmp_str;
3617					unsigned int i;
3618
3619					/* Default is NOT correct */
3620					SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3621					    stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3622					SCTP_TCB_UNLOCK(stcb);
3623					SCTP_MALLOC(tmp_str,
3624					    struct sctp_stream_out *,
3625					    (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3626					    SCTP_M_STRMO);
3627					SCTP_TCB_LOCK(stcb);
3628					if (tmp_str != NULL) {
3629						SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3630						stcb->asoc.strmout = tmp_str;
3631						stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3632					} else {
3633						stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3634					}
3635					for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3636						TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3637						stcb->asoc.strmout[i].chunks_on_queues = 0;
3638						stcb->asoc.strmout[i].next_sequence_send = 0;
3639						stcb->asoc.strmout[i].stream_no = i;
3640						stcb->asoc.strmout[i].last_msg_incomplete = 0;
3641						stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3642					}
3643				}
3644				break;
3645#ifdef INET
3646			case SCTP_DSTADDRV4:
3647				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3648					*error = EINVAL;
3649					return (1);
3650				}
3651				memset(&sin, 0, sizeof(struct sockaddr_in));
3652				sin.sin_family = AF_INET;
3653				sin.sin_len = sizeof(struct sockaddr_in);
3654				sin.sin_port = stcb->rport;
3655				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3656				if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3657				    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3658				    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3659					*error = EINVAL;
3660					return (1);
3661				}
3662				if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3663				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3664					*error = ENOBUFS;
3665					return (1);
3666				}
3667				break;
3668#endif
3669#ifdef INET6
3670			case SCTP_DSTADDRV6:
3671				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3672					*error = EINVAL;
3673					return (1);
3674				}
3675				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3676				sin6.sin6_family = AF_INET6;
3677				sin6.sin6_len = sizeof(struct sockaddr_in6);
3678				sin6.sin6_port = stcb->rport;
3679				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3680				if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3681				    IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3682					*error = EINVAL;
3683					return (1);
3684				}
3685#ifdef INET
3686				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3687					in6_sin6_2_sin(&sin, &sin6);
3688					if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3689					    (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3690					    IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3691						*error = EINVAL;
3692						return (1);
3693					}
3694					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3695					    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3696						*error = ENOBUFS;
3697						return (1);
3698					}
3699				} else
3700#endif
3701					if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3702				    SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3703					*error = ENOBUFS;
3704					return (1);
3705				}
3706				break;
3707#endif
3708			default:
3709				break;
3710			}
3711		}
3712		at += CMSG_ALIGN(cmh.cmsg_len);
3713	}
3714	return (0);
3715}
3716
3717static struct sctp_tcb *
3718sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3719    uint16_t port,
3720    struct mbuf *control,
3721    struct sctp_nets **net_p,
3722    int *error)
3723{
3724	struct cmsghdr cmh;
3725	int tlen, at;
3726	struct sctp_tcb *stcb;
3727	struct sockaddr *addr;
3728
3729#ifdef INET
3730	struct sockaddr_in sin;
3731
3732#endif
3733#ifdef INET6
3734	struct sockaddr_in6 sin6;
3735
3736#endif
3737
3738	tlen = SCTP_BUF_LEN(control);
3739	at = 0;
3740	while (at < tlen) {
3741		if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3742			/* There is not enough room for one more. */
3743			*error = EINVAL;
3744			return (NULL);
3745		}
3746		m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3747		if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3748			/* We dont't have a complete CMSG header. */
3749			*error = EINVAL;
3750			return (NULL);
3751		}
3752		if (((int)cmh.cmsg_len + at) > tlen) {
3753			/* We don't have the complete CMSG. */
3754			*error = EINVAL;
3755			return (NULL);
3756		}
3757		if (cmh.cmsg_level == IPPROTO_SCTP) {
3758			switch (cmh.cmsg_type) {
3759#ifdef INET
3760			case SCTP_DSTADDRV4:
3761				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3762					*error = EINVAL;
3763					return (NULL);
3764				}
3765				memset(&sin, 0, sizeof(struct sockaddr_in));
3766				sin.sin_family = AF_INET;
3767				sin.sin_len = sizeof(struct sockaddr_in);
3768				sin.sin_port = port;
3769				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3770				addr = (struct sockaddr *)&sin;
3771				break;
3772#endif
3773#ifdef INET6
3774			case SCTP_DSTADDRV6:
3775				if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3776					*error = EINVAL;
3777					return (NULL);
3778				}
3779				memset(&sin6, 0, sizeof(struct sockaddr_in6));
3780				sin6.sin6_family = AF_INET6;
3781				sin6.sin6_len = sizeof(struct sockaddr_in6);
3782				sin6.sin6_port = port;
3783				m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3784#ifdef INET
3785				if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3786					in6_sin6_2_sin(&sin, &sin6);
3787					addr = (struct sockaddr *)&sin;
3788				} else
3789#endif
3790					addr = (struct sockaddr *)&sin6;
3791				break;
3792#endif
3793			default:
3794				addr = NULL;
3795				break;
3796			}
3797			if (addr) {
3798				stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3799				if (stcb != NULL) {
3800					return (stcb);
3801				}
3802			}
3803		}
3804		at += CMSG_ALIGN(cmh.cmsg_len);
3805	}
3806	return (NULL);
3807}
3808
3809static struct mbuf *
3810sctp_add_cookie(struct mbuf *init, int init_offset,
3811    struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3812{
3813	struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3814	struct sctp_state_cookie *stc;
3815	struct sctp_paramhdr *ph;
3816	uint8_t *foo;
3817	int sig_offset;
3818	uint16_t cookie_sz;
3819
3820	mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3821	    sizeof(struct sctp_paramhdr)), 0,
3822	    M_DONTWAIT, 1, MT_DATA);
3823	if (mret == NULL) {
3824		return (NULL);
3825	}
3826	copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3827	if (copy_init == NULL) {
3828		sctp_m_freem(mret);
3829		return (NULL);
3830	}
3831#ifdef SCTP_MBUF_LOGGING
3832	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3833		struct mbuf *mat;
3834
3835		for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3836			if (SCTP_BUF_IS_EXTENDED(mat)) {
3837				sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3838			}
3839		}
3840	}
3841#endif
3842	copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3843	    M_DONTWAIT);
3844	if (copy_initack == NULL) {
3845		sctp_m_freem(mret);
3846		sctp_m_freem(copy_init);
3847		return (NULL);
3848	}
3849#ifdef SCTP_MBUF_LOGGING
3850	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3851		struct mbuf *mat;
3852
3853		for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3854			if (SCTP_BUF_IS_EXTENDED(mat)) {
3855				sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3856			}
3857		}
3858	}
3859#endif
3860	/* easy side we just drop it on the end */
3861	ph = mtod(mret, struct sctp_paramhdr *);
3862	SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3863	    sizeof(struct sctp_paramhdr);
3864	stc = (struct sctp_state_cookie *)((caddr_t)ph +
3865	    sizeof(struct sctp_paramhdr));
3866	ph->param_type = htons(SCTP_STATE_COOKIE);
3867	ph->param_length = 0;	/* fill in at the end */
3868	/* Fill in the stc cookie data */
3869	memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3870
3871	/* tack the INIT and then the INIT-ACK onto the chain */
3872	cookie_sz = 0;
3873	for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3874		cookie_sz += SCTP_BUF_LEN(m_at);
3875		if (SCTP_BUF_NEXT(m_at) == NULL) {
3876			SCTP_BUF_NEXT(m_at) = copy_init;
3877			break;
3878		}
3879	}
3880	for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3881		cookie_sz += SCTP_BUF_LEN(m_at);
3882		if (SCTP_BUF_NEXT(m_at) == NULL) {
3883			SCTP_BUF_NEXT(m_at) = copy_initack;
3884			break;
3885		}
3886	}
3887	for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3888		cookie_sz += SCTP_BUF_LEN(m_at);
3889		if (SCTP_BUF_NEXT(m_at) == NULL) {
3890			break;
3891		}
3892	}
3893	sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3894	if (sig == NULL) {
3895		/* no space, so free the entire chain */
3896		sctp_m_freem(mret);
3897		return (NULL);
3898	}
3899	SCTP_BUF_LEN(sig) = 0;
3900	SCTP_BUF_NEXT(m_at) = sig;
3901	sig_offset = 0;
3902	foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3903	memset(foo, 0, SCTP_SIGNATURE_SIZE);
3904	*signature = foo;
3905	SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3906	cookie_sz += SCTP_SIGNATURE_SIZE;
3907	ph->param_length = htons(cookie_sz);
3908	return (mret);
3909}
3910
3911
3912static uint8_t
3913sctp_get_ect(struct sctp_tcb *stcb)
3914{
3915	if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3916		return (SCTP_ECT0_BIT);
3917	} else {
3918		return (0);
3919	}
3920}
3921
3922#if defined(INET) || defined(INET6)
3923static void
3924sctp_handle_no_route(struct sctp_tcb *stcb,
3925    struct sctp_nets *net,
3926    int so_locked)
3927{
3928	SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3929
3930	if (net) {
3931		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3932		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3933		if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3934			if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3935				SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3936				sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3937				    stcb, 0,
3938				    (void *)net,
3939				    so_locked);
3940				net->dest_state &= ~SCTP_ADDR_REACHABLE;
3941				net->dest_state &= ~SCTP_ADDR_PF;
3942			}
3943		}
3944		if (stcb) {
3945			if (net == stcb->asoc.primary_destination) {
3946				/* need a new primary */
3947				struct sctp_nets *alt;
3948
3949				alt = sctp_find_alternate_net(stcb, net, 0);
3950				if (alt != net) {
3951					if (stcb->asoc.alternate) {
3952						sctp_free_remote_addr(stcb->asoc.alternate);
3953					}
3954					stcb->asoc.alternate = alt;
3955					atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3956					if (net->ro._s_addr) {
3957						sctp_free_ifa(net->ro._s_addr);
3958						net->ro._s_addr = NULL;
3959					}
3960					net->src_addr_selected = 0;
3961				}
3962			}
3963		}
3964	}
3965}
3966
3967#endif
3968
3969static int
3970sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3971    struct sctp_tcb *stcb,	/* may be NULL */
3972    struct sctp_nets *net,
3973    struct sockaddr *to,
3974    struct mbuf *m,
3975    uint32_t auth_offset,
3976    struct sctp_auth_chunk *auth,
3977    uint16_t auth_keyid,
3978    int nofragment_flag,
3979    int ecn_ok,
3980    int out_of_asoc_ok,
3981    uint16_t src_port,
3982    uint16_t dest_port,
3983    uint32_t v_tag,
3984    uint16_t port,
3985    union sctp_sockstore *over_addr,
3986    uint8_t use_mflowid, uint32_t mflowid,
3987#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3988    int so_locked SCTP_UNUSED
3989#else
3990    int so_locked
3991#endif
3992)
3993/* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3994{
3995	/**
3996	 * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3997	 * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3998	 * - fill in the HMAC digest of any AUTH chunk in the packet.
3999	 * - calculate and fill in the SCTP checksum.
4000	 * - prepend an IP address header.
4001	 * - if boundall use INADDR_ANY.
4002	 * - if boundspecific do source address selection.
4003	 * - set fragmentation option for ipV4.
4004	 * - On return from IP output, check/adjust mtu size of output
4005	 *   interface and smallest_mtu size as well.
4006	 */
4007	/* Will need ifdefs around this */
4008	struct mbuf *newm;
4009	struct sctphdr *sctphdr;
4010	int packet_length;
4011	int ret;
4012
4013#if defined(INET) || defined(INET6)
4014	uint32_t vrf_id;
4015
4016#endif
4017#if defined(INET) || defined(INET6)
4018	struct mbuf *o_pak;
4019	sctp_route_t *ro = NULL;
4020	struct udphdr *udp = NULL;
4021
4022#endif
4023	uint8_t tos_value;
4024
4025#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4026	struct socket *so = NULL;
4027
4028#endif
4029
4030	if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
4031		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4032		sctp_m_freem(m);
4033		return (EFAULT);
4034	}
4035#if defined(INET) || defined(INET6)
4036	if (stcb) {
4037		vrf_id = stcb->asoc.vrf_id;
4038	} else {
4039		vrf_id = inp->def_vrf_id;
4040	}
4041#endif
4042	/* fill in the HMAC digest for any AUTH chunk in the packet */
4043	if ((auth != NULL) && (stcb != NULL)) {
4044		sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
4045	}
4046	if (net) {
4047		tos_value = net->dscp;
4048	} else if (stcb) {
4049		tos_value = stcb->asoc.default_dscp;
4050	} else {
4051		tos_value = inp->sctp_ep.default_dscp;
4052	}
4053
4054	switch (to->sa_family) {
4055#ifdef INET
4056	case AF_INET:
4057		{
4058			struct ip *ip = NULL;
4059			sctp_route_t iproute;
4060			int len;
4061
4062			len = sizeof(struct ip) + sizeof(struct sctphdr);
4063			if (port) {
4064				len += sizeof(struct udphdr);
4065			}
4066			newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4067			if (newm == NULL) {
4068				sctp_m_freem(m);
4069				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4070				return (ENOMEM);
4071			}
4072			SCTP_ALIGN_TO_END(newm, len);
4073			SCTP_BUF_LEN(newm) = len;
4074			SCTP_BUF_NEXT(newm) = m;
4075			m = newm;
4076			if (net != NULL) {
4077#ifdef INVARIANTS
4078				if (net->flowidset == 0) {
4079					panic("Flow ID not set");
4080				}
4081#endif
4082				m->m_pkthdr.flowid = net->flowid;
4083				m->m_flags |= M_FLOWID;
4084			} else {
4085				if (use_mflowid != 0) {
4086					m->m_pkthdr.flowid = mflowid;
4087					m->m_flags |= M_FLOWID;
4088				}
4089			}
4090			packet_length = sctp_calculate_len(m);
4091			ip = mtod(m, struct ip *);
4092			ip->ip_v = IPVERSION;
4093			ip->ip_hl = (sizeof(struct ip) >> 2);
4094			if (tos_value == 0) {
4095				/*
4096				 * This means especially, that it is not set
4097				 * at the SCTP layer. So use the value from
4098				 * the IP layer.
4099				 */
4100				tos_value = inp->ip_inp.inp.inp_ip_tos;
4101			}
4102			tos_value &= 0xfc;
4103			if (ecn_ok) {
4104				tos_value |= sctp_get_ect(stcb);
4105			}
4106			if ((nofragment_flag) && (port == 0)) {
4107				ip->ip_off = IP_DF;
4108			} else {
4109				ip->ip_off = 0;
4110			}
4111			/* FreeBSD has a function for ip_id's */
4112			ip->ip_id = ip_newid();
4113
4114			ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4115			ip->ip_len = packet_length;
4116			ip->ip_tos = tos_value;
4117			if (port) {
4118				ip->ip_p = IPPROTO_UDP;
4119			} else {
4120				ip->ip_p = IPPROTO_SCTP;
4121			}
4122			ip->ip_sum = 0;
4123			if (net == NULL) {
4124				ro = &iproute;
4125				memset(&iproute, 0, sizeof(iproute));
4126				memcpy(&ro->ro_dst, to, to->sa_len);
4127			} else {
4128				ro = (sctp_route_t *) & net->ro;
4129			}
4130			/* Now the address selection part */
4131			ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4132
4133			/* call the routine to select the src address */
4134			if (net && out_of_asoc_ok == 0) {
4135				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4136					sctp_free_ifa(net->ro._s_addr);
4137					net->ro._s_addr = NULL;
4138					net->src_addr_selected = 0;
4139					if (ro->ro_rt) {
4140						RTFREE(ro->ro_rt);
4141						ro->ro_rt = NULL;
4142					}
4143				}
4144				if (net->src_addr_selected == 0) {
4145					/* Cache the source address */
4146					net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4147					    ro, net, 0,
4148					    vrf_id);
4149					net->src_addr_selected = 1;
4150				}
4151				if (net->ro._s_addr == NULL) {
4152					/* No route to host */
4153					net->src_addr_selected = 0;
4154					sctp_handle_no_route(stcb, net, so_locked);
4155					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4156					sctp_m_freem(m);
4157					return (EHOSTUNREACH);
4158				}
4159				ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4160			} else {
4161				if (over_addr == NULL) {
4162					struct sctp_ifa *_lsrc;
4163
4164					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4165					    net,
4166					    out_of_asoc_ok,
4167					    vrf_id);
4168					if (_lsrc == NULL) {
4169						sctp_handle_no_route(stcb, net, so_locked);
4170						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4171						sctp_m_freem(m);
4172						return (EHOSTUNREACH);
4173					}
4174					ip->ip_src = _lsrc->address.sin.sin_addr;
4175					sctp_free_ifa(_lsrc);
4176				} else {
4177					ip->ip_src = over_addr->sin.sin_addr;
4178					SCTP_RTALLOC(ro, vrf_id);
4179				}
4180			}
4181			if (port) {
4182				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4183					sctp_handle_no_route(stcb, net, so_locked);
4184					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4185					sctp_m_freem(m);
4186					return (EHOSTUNREACH);
4187				}
4188				udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4189				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4190				udp->uh_dport = port;
4191				udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4192				if (V_udp_cksum) {
4193					udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4194				} else {
4195					udp->uh_sum = 0;
4196				}
4197				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4198			} else {
4199				sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4200			}
4201
4202			sctphdr->src_port = src_port;
4203			sctphdr->dest_port = dest_port;
4204			sctphdr->v_tag = v_tag;
4205			sctphdr->checksum = 0;
4206
4207			/*
4208			 * If source address selection fails and we find no
4209			 * route then the ip_output should fail as well with
4210			 * a NO_ROUTE_TO_HOST type error. We probably should
4211			 * catch that somewhere and abort the association
4212			 * right away (assuming this is an INIT being sent).
4213			 */
4214			if (ro->ro_rt == NULL) {
4215				/*
4216				 * src addr selection failed to find a route
4217				 * (or valid source addr), so we can't get
4218				 * there from here (yet)!
4219				 */
4220				sctp_handle_no_route(stcb, net, so_locked);
4221				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4222				sctp_m_freem(m);
4223				return (EHOSTUNREACH);
4224			}
4225			if (ro != &iproute) {
4226				memcpy(&iproute, ro, sizeof(*ro));
4227			}
4228			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4229			    (uint32_t) (ntohl(ip->ip_src.s_addr)));
4230			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4231			    (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4232			SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4233			    (void *)ro->ro_rt);
4234
4235			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4236				/* failed to prepend data, give up */
4237				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4238				sctp_m_freem(m);
4239				return (ENOMEM);
4240			}
4241			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4242			if (port) {
4243#if defined(SCTP_WITH_NO_CSUM)
4244				SCTP_STAT_INCR(sctps_sendnocrc);
4245#else
4246				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4247				SCTP_STAT_INCR(sctps_sendswcrc);
4248#endif
4249				if (V_udp_cksum) {
4250					SCTP_ENABLE_UDP_CSUM(o_pak);
4251				}
4252			} else {
4253#if defined(SCTP_WITH_NO_CSUM)
4254				SCTP_STAT_INCR(sctps_sendnocrc);
4255#else
4256				m->m_pkthdr.csum_flags = CSUM_SCTP;
4257				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4258				SCTP_STAT_INCR(sctps_sendhwcrc);
4259#endif
4260			}
4261#ifdef SCTP_PACKET_LOGGING
4262			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4263				sctp_packet_log(o_pak);
4264#endif
4265			/* send it out.  table id is taken from stcb */
4266#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4267			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4268				so = SCTP_INP_SO(inp);
4269				SCTP_SOCKET_UNLOCK(so, 0);
4270			}
4271#endif
4272			SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4273#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4274			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4275				atomic_add_int(&stcb->asoc.refcnt, 1);
4276				SCTP_TCB_UNLOCK(stcb);
4277				SCTP_SOCKET_LOCK(so, 0);
4278				SCTP_TCB_LOCK(stcb);
4279				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4280			}
4281#endif
4282			SCTP_STAT_INCR(sctps_sendpackets);
4283			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4284			if (ret)
4285				SCTP_STAT_INCR(sctps_senderrors);
4286
4287			SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4288			if (net == NULL) {
4289				/* free tempy routes */
4290				RO_RTFREE(ro);
4291			} else {
4292				/*
4293				 * PMTU check versus smallest asoc MTU goes
4294				 * here
4295				 */
4296				if ((ro->ro_rt != NULL) &&
4297				    (net->ro._s_addr)) {
4298					uint32_t mtu;
4299
4300					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4301					if (net->port) {
4302						mtu -= sizeof(struct udphdr);
4303					}
4304					if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4305						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4306						net->mtu = mtu;
4307					}
4308				} else if (ro->ro_rt == NULL) {
4309					/* route was freed */
4310					if (net->ro._s_addr &&
4311					    net->src_addr_selected) {
4312						sctp_free_ifa(net->ro._s_addr);
4313						net->ro._s_addr = NULL;
4314					}
4315					net->src_addr_selected = 0;
4316				}
4317			}
4318			return (ret);
4319		}
4320#endif
4321#ifdef INET6
4322	case AF_INET6:
4323		{
4324			uint32_t flowlabel, flowinfo;
4325			struct ip6_hdr *ip6h;
4326			struct route_in6 ip6route;
4327			struct ifnet *ifp;
4328			struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4329			int prev_scope = 0;
4330			struct sockaddr_in6 lsa6_storage;
4331			int error;
4332			u_short prev_port = 0;
4333			int len;
4334
4335			if (net) {
4336				flowlabel = net->flowlabel;
4337			} else if (stcb) {
4338				flowlabel = stcb->asoc.default_flowlabel;
4339			} else {
4340				flowlabel = inp->sctp_ep.default_flowlabel;
4341			}
4342			if (flowlabel == 0) {
4343				/*
4344				 * This means especially, that it is not set
4345				 * at the SCTP layer. So use the value from
4346				 * the IP layer.
4347				 */
4348				flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4349			}
4350			flowlabel &= 0x000fffff;
4351			len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4352			if (port) {
4353				len += sizeof(struct udphdr);
4354			}
4355			newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4356			if (newm == NULL) {
4357				sctp_m_freem(m);
4358				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4359				return (ENOMEM);
4360			}
4361			SCTP_ALIGN_TO_END(newm, len);
4362			SCTP_BUF_LEN(newm) = len;
4363			SCTP_BUF_NEXT(newm) = m;
4364			m = newm;
4365			if (net != NULL) {
4366#ifdef INVARIANTS
4367				if (net->flowidset == 0) {
4368					panic("Flow ID not set");
4369				}
4370#endif
4371				m->m_pkthdr.flowid = net->flowid;
4372				m->m_flags |= M_FLOWID;
4373			} else {
4374				if (use_mflowid != 0) {
4375					m->m_pkthdr.flowid = mflowid;
4376					m->m_flags |= M_FLOWID;
4377				}
4378			}
4379			packet_length = sctp_calculate_len(m);
4380
4381			ip6h = mtod(m, struct ip6_hdr *);
4382			/* protect *sin6 from overwrite */
4383			sin6 = (struct sockaddr_in6 *)to;
4384			tmp = *sin6;
4385			sin6 = &tmp;
4386
4387			/* KAME hack: embed scopeid */
4388			if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4389				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4390				return (EINVAL);
4391			}
4392			if (net == NULL) {
4393				memset(&ip6route, 0, sizeof(ip6route));
4394				ro = (sctp_route_t *) & ip6route;
4395				memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4396			} else {
4397				ro = (sctp_route_t *) & net->ro;
4398			}
4399			/*
4400			 * We assume here that inp_flow is in host byte
4401			 * order within the TCB!
4402			 */
4403			if (tos_value == 0) {
4404				/*
4405				 * This means especially, that it is not set
4406				 * at the SCTP layer. So use the value from
4407				 * the IP layer.
4408				 */
4409				tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4410			}
4411			tos_value &= 0xfc;
4412			if (ecn_ok) {
4413				tos_value |= sctp_get_ect(stcb);
4414			}
4415			flowinfo = 0x06;
4416			flowinfo <<= 8;
4417			flowinfo |= tos_value;
4418			flowinfo <<= 20;
4419			flowinfo |= flowlabel;
4420			ip6h->ip6_flow = htonl(flowinfo);
4421			if (port) {
4422				ip6h->ip6_nxt = IPPROTO_UDP;
4423			} else {
4424				ip6h->ip6_nxt = IPPROTO_SCTP;
4425			}
4426			ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4427			ip6h->ip6_dst = sin6->sin6_addr;
4428
4429			/*
4430			 * Add SRC address selection here: we can only reuse
4431			 * to a limited degree the kame src-addr-sel, since
4432			 * we can try their selection but it may not be
4433			 * bound.
4434			 */
4435			bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4436			lsa6_tmp.sin6_family = AF_INET6;
4437			lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4438			lsa6 = &lsa6_tmp;
4439			if (net && out_of_asoc_ok == 0) {
4440				if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4441					sctp_free_ifa(net->ro._s_addr);
4442					net->ro._s_addr = NULL;
4443					net->src_addr_selected = 0;
4444					if (ro->ro_rt) {
4445						RTFREE(ro->ro_rt);
4446						ro->ro_rt = NULL;
4447					}
4448				}
4449				if (net->src_addr_selected == 0) {
4450					sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4451					/* KAME hack: embed scopeid */
4452					if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4453						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4454						return (EINVAL);
4455					}
4456					/* Cache the source address */
4457					net->ro._s_addr = sctp_source_address_selection(inp,
4458					    stcb,
4459					    ro,
4460					    net,
4461					    0,
4462					    vrf_id);
4463					(void)sa6_recoverscope(sin6);
4464					net->src_addr_selected = 1;
4465				}
4466				if (net->ro._s_addr == NULL) {
4467					SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4468					net->src_addr_selected = 0;
4469					sctp_handle_no_route(stcb, net, so_locked);
4470					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4471					sctp_m_freem(m);
4472					return (EHOSTUNREACH);
4473				}
4474				lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4475			} else {
4476				sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4477				/* KAME hack: embed scopeid */
4478				if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4479					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4480					return (EINVAL);
4481				}
4482				if (over_addr == NULL) {
4483					struct sctp_ifa *_lsrc;
4484
4485					_lsrc = sctp_source_address_selection(inp, stcb, ro,
4486					    net,
4487					    out_of_asoc_ok,
4488					    vrf_id);
4489					if (_lsrc == NULL) {
4490						sctp_handle_no_route(stcb, net, so_locked);
4491						SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4492						sctp_m_freem(m);
4493						return (EHOSTUNREACH);
4494					}
4495					lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4496					sctp_free_ifa(_lsrc);
4497				} else {
4498					lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4499					SCTP_RTALLOC(ro, vrf_id);
4500				}
4501				(void)sa6_recoverscope(sin6);
4502			}
4503			lsa6->sin6_port = inp->sctp_lport;
4504
4505			if (ro->ro_rt == NULL) {
4506				/*
4507				 * src addr selection failed to find a route
4508				 * (or valid source addr), so we can't get
4509				 * there from here!
4510				 */
4511				sctp_handle_no_route(stcb, net, so_locked);
4512				SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4513				sctp_m_freem(m);
4514				return (EHOSTUNREACH);
4515			}
4516			/*
4517			 * XXX: sa6 may not have a valid sin6_scope_id in
4518			 * the non-SCOPEDROUTING case.
4519			 */
4520			bzero(&lsa6_storage, sizeof(lsa6_storage));
4521			lsa6_storage.sin6_family = AF_INET6;
4522			lsa6_storage.sin6_len = sizeof(lsa6_storage);
4523			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4524			if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4525				SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4526				sctp_m_freem(m);
4527				return (error);
4528			}
4529			/* XXX */
4530			lsa6_storage.sin6_addr = lsa6->sin6_addr;
4531			lsa6_storage.sin6_port = inp->sctp_lport;
4532			lsa6 = &lsa6_storage;
4533			ip6h->ip6_src = lsa6->sin6_addr;
4534
4535			if (port) {
4536				if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4537					sctp_handle_no_route(stcb, net, so_locked);
4538					SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4539					sctp_m_freem(m);
4540					return (EHOSTUNREACH);
4541				}
4542				udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4543				udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4544				udp->uh_dport = port;
4545				udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4546				udp->uh_sum = 0;
4547				sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4548			} else {
4549				sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4550			}
4551
4552			sctphdr->src_port = src_port;
4553			sctphdr->dest_port = dest_port;
4554			sctphdr->v_tag = v_tag;
4555			sctphdr->checksum = 0;
4556
4557			/*
4558			 * We set the hop limit now since there is a good
4559			 * chance that our ro pointer is now filled
4560			 */
4561			ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4562			ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4563
4564#ifdef SCTP_DEBUG
4565			/* Copy to be sure something bad is not happening */
4566			sin6->sin6_addr = ip6h->ip6_dst;
4567			lsa6->sin6_addr = ip6h->ip6_src;
4568#endif
4569
4570			SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4571			SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4572			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4573			SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4574			SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4575			if (net) {
4576				sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4577				/*
4578				 * preserve the port and scope for link
4579				 * local send
4580				 */
4581				prev_scope = sin6->sin6_scope_id;
4582				prev_port = sin6->sin6_port;
4583			}
4584			if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4585				/* failed to prepend data, give up */
4586				sctp_m_freem(m);
4587				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4588				return (ENOMEM);
4589			}
4590			SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4591			if (port) {
4592#if defined(SCTP_WITH_NO_CSUM)
4593				SCTP_STAT_INCR(sctps_sendnocrc);
4594#else
4595				sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4596				SCTP_STAT_INCR(sctps_sendswcrc);
4597#endif
4598				if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4599					udp->uh_sum = 0xffff;
4600				}
4601			} else {
4602#if defined(SCTP_WITH_NO_CSUM)
4603				SCTP_STAT_INCR(sctps_sendnocrc);
4604#else
4605				m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4606				m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
4607				SCTP_STAT_INCR(sctps_sendhwcrc);
4608#endif
4609			}
4610			/* send it out. table id is taken from stcb */
4611#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4612			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4613				so = SCTP_INP_SO(inp);
4614				SCTP_SOCKET_UNLOCK(so, 0);
4615			}
4616#endif
4617#ifdef SCTP_PACKET_LOGGING
4618			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4619				sctp_packet_log(o_pak);
4620#endif
4621			SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4622#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4623			if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4624				atomic_add_int(&stcb->asoc.refcnt, 1);
4625				SCTP_TCB_UNLOCK(stcb);
4626				SCTP_SOCKET_LOCK(so, 0);
4627				SCTP_TCB_LOCK(stcb);
4628				atomic_subtract_int(&stcb->asoc.refcnt, 1);
4629			}
4630#endif
4631			if (net) {
4632				/* for link local this must be done */
4633				sin6->sin6_scope_id = prev_scope;
4634				sin6->sin6_port = prev_port;
4635			}
4636			SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4637			SCTP_STAT_INCR(sctps_sendpackets);
4638			SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4639			if (ret) {
4640				SCTP_STAT_INCR(sctps_senderrors);
4641			}
4642			if (net == NULL) {
4643				/* Now if we had a temp route free it */
4644				RO_RTFREE(ro);
4645			} else {
4646				/*
4647				 * PMTU check versus smallest asoc MTU goes
4648				 * here
4649				 */
4650				if (ro->ro_rt == NULL) {
4651					/* Route was freed */
4652					if (net->ro._s_addr &&
4653					    net->src_addr_selected) {
4654						sctp_free_ifa(net->ro._s_addr);
4655						net->ro._s_addr = NULL;
4656					}
4657					net->src_addr_selected = 0;
4658				}
4659				if ((ro->ro_rt != NULL) &&
4660				    (net->ro._s_addr)) {
4661					uint32_t mtu;
4662
4663					mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4664					if (mtu &&
4665					    (stcb->asoc.smallest_mtu > mtu)) {
4666						sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4667						net->mtu = mtu;
4668						if (net->port) {
4669							net->mtu -= sizeof(struct udphdr);
4670						}
4671					}
4672				} else if (ifp) {
4673					if (ND_IFINFO(ifp)->linkmtu &&
4674					    (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4675						sctp_mtu_size_reset(inp,
4676						    &stcb->asoc,
4677						    ND_IFINFO(ifp)->linkmtu);
4678					}
4679				}
4680			}
4681			return (ret);
4682		}
4683#endif
4684	default:
4685		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4686		    ((struct sockaddr *)to)->sa_family);
4687		sctp_m_freem(m);
4688		SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4689		return (EFAULT);
4690	}
4691}
4692
4693
4694void
4695sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4696#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4697    SCTP_UNUSED
4698#endif
4699)
4700{
4701	struct mbuf *m;
4702	struct sctp_nets *net;
4703	struct sctp_init_chunk *init;
4704	struct sctp_supported_addr_param *sup_addr;
4705	struct sctp_adaptation_layer_indication *ali;
4706	struct sctp_supported_chunk_types_param *pr_supported;
4707	struct sctp_paramhdr *ph;
4708	int cnt_inits_to = 0;
4709	int ret;
4710	uint16_t num_ext, chunk_len, padding_len, parameter_len;
4711
4712	/* INIT's always go to the primary (and usually ONLY address) */
4713	net = stcb->asoc.primary_destination;
4714	if (net == NULL) {
4715		net = TAILQ_FIRST(&stcb->asoc.nets);
4716		if (net == NULL) {
4717			/* TSNH */
4718			return;
4719		}
4720		/* we confirm any address we send an INIT to */
4721		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4722		(void)sctp_set_primary_addr(stcb, NULL, net);
4723	} else {
4724		/* we confirm any address we send an INIT to */
4725		net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4726	}
4727	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4728#ifdef INET6
4729	if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4730		/*
4731		 * special hook, if we are sending to link local it will not
4732		 * show up in our private address count.
4733		 */
4734		if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4735			cnt_inits_to = 1;
4736	}
4737#endif
4738	if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4739		/* This case should not happen */
4740		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4741		return;
4742	}
4743	/* start the INIT timer */
4744	sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4745
4746	m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4747	if (m == NULL) {
4748		/* No memory, INIT timer will re-attempt. */
4749		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4750		return;
4751	}
4752	chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4753	padding_len = 0;
4754	/*
4755	 * assume peer supports asconf in order to be able to queue local
4756	 * address changes while an INIT is in flight and before the assoc
4757	 * is established.
4758	 */
4759	stcb->asoc.peer_supports_asconf = 1;
4760	/* Now lets put the chunk header in place */
4761	init = mtod(m, struct sctp_init_chunk *);
4762	/* now the chunk header */
4763	init->ch.chunk_type = SCTP_INITIATION;
4764	init->ch.chunk_flags = 0;
4765	/* fill in later from mbuf we build */
4766	init->ch.chunk_length = 0;
4767	/* place in my tag */
4768	init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4769	/* set up some of the credits. */
4770	init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4771	    SCTP_MINIMAL_RWND));
4772	init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4773	init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4774	init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4775
4776	if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4777		uint8_t i;
4778
4779		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4780		if (stcb->asoc.scope.ipv4_addr_legal) {
4781			parameter_len += (uint16_t) sizeof(uint16_t);
4782		}
4783		if (stcb->asoc.scope.ipv6_addr_legal) {
4784			parameter_len += (uint16_t) sizeof(uint16_t);
4785		}
4786		sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4787		sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4788		sup_addr->ph.param_length = htons(parameter_len);
4789		i = 0;
4790		if (stcb->asoc.scope.ipv4_addr_legal) {
4791			sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4792		}
4793		if (stcb->asoc.scope.ipv6_addr_legal) {
4794			sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4795		}
4796		padding_len = 4 - 2 * i;
4797		chunk_len += parameter_len;
4798	}
4799	/* Adaptation layer indication parameter */
4800	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4801		if (padding_len > 0) {
4802			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4803			chunk_len += padding_len;
4804			padding_len = 0;
4805		}
4806		parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4807		ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4808		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4809		ali->ph.param_length = htons(parameter_len);
4810		ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4811		chunk_len += parameter_len;
4812	}
4813	if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4814		/* Add NAT friendly parameter. */
4815		if (padding_len > 0) {
4816			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4817			chunk_len += padding_len;
4818			padding_len = 0;
4819		}
4820		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4821		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4822		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4823		ph->param_length = htons(parameter_len);
4824		chunk_len += parameter_len;
4825	}
4826	/* now any cookie time extensions */
4827	if (stcb->asoc.cookie_preserve_req) {
4828		struct sctp_cookie_perserve_param *cookie_preserve;
4829
4830		if (padding_len > 0) {
4831			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4832			chunk_len += padding_len;
4833			padding_len = 0;
4834		}
4835		parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4836		cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4837		cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4838		cookie_preserve->ph.param_length = htons(parameter_len);
4839		cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4840		stcb->asoc.cookie_preserve_req = 0;
4841		chunk_len += parameter_len;
4842	}
4843	/* ECN parameter */
4844	if (stcb->asoc.ecn_allowed == 1) {
4845		if (padding_len > 0) {
4846			memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4847			chunk_len += padding_len;
4848			padding_len = 0;
4849		}
4850		parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4851		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4852		ph->param_type = htons(SCTP_ECN_CAPABLE);
4853		ph->param_length = htons(parameter_len);
4854		chunk_len += parameter_len;
4855	}
4856	/* And now tell the peer we do support PR-SCTP. */
4857	if (padding_len > 0) {
4858		memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4859		chunk_len += padding_len;
4860		padding_len = 0;
4861	}
4862	parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4863	ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4864	ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4865	ph->param_length = htons(parameter_len);
4866	chunk_len += parameter_len;
4867
4868	/* And now tell the peer we do all the extensions */
4869	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4870	pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4871	num_ext = 0;
4872	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4873	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4874	pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4875	pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4876	pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4877	if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4878		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4879	}
4880	if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4881		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4882	}
4883	parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4884	pr_supported->ph.param_length = htons(parameter_len);
4885	padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4886	chunk_len += parameter_len;
4887
4888	/* add authentication parameters */
4889	if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4890		/* attach RANDOM parameter, if available */
4891		if (stcb->asoc.authinfo.random != NULL) {
4892			struct sctp_auth_random *randp;
4893
4894			if (padding_len > 0) {
4895				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4896				chunk_len += padding_len;
4897				padding_len = 0;
4898			}
4899			randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4900			parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4901			/* random key already contains the header */
4902			memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4903			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4904			chunk_len += parameter_len;
4905		}
4906		/* add HMAC_ALGO parameter */
4907		if ((stcb->asoc.local_hmacs != NULL) &&
4908		    (stcb->asoc.local_hmacs->num_algo > 0)) {
4909			struct sctp_auth_hmac_algo *hmacs;
4910
4911			if (padding_len > 0) {
4912				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4913				chunk_len += padding_len;
4914				padding_len = 0;
4915			}
4916			hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4917			parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4918			    stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4919			hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4920			hmacs->ph.param_length = htons(parameter_len);
4921			sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4922			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4923			chunk_len += parameter_len;
4924		}
4925		/* add CHUNKS parameter */
4926		if (sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks) > 0) {
4927			struct sctp_auth_chunk_list *chunks;
4928
4929			if (padding_len > 0) {
4930				memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4931				chunk_len += padding_len;
4932				padding_len = 0;
4933			}
4934			chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4935			parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4936			    sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4937			chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4938			chunks->ph.param_length = htons(parameter_len);
4939			sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4940			padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4941			chunk_len += parameter_len;
4942		}
4943	}
4944	SCTP_BUF_LEN(m) = chunk_len;
4945
4946	/* now the addresses */
4947	/*
4948	 * To optimize this we could put the scoping stuff into a structure
4949	 * and remove the individual uint8's from the assoc structure. Then
4950	 * we could just sifa in the address within the stcb. But for now
4951	 * this is a quick hack to get the address stuff teased apart.
4952	 */
4953	sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope, m, cnt_inits_to, &padding_len, &chunk_len);
4954
4955	init->ch.chunk_length = htons(chunk_len);
4956	if (padding_len > 0) {
4957		struct mbuf *m_at, *mp_last;
4958
4959		mp_last = NULL;
4960		for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4961			if (SCTP_BUF_NEXT(m_at) == NULL)
4962				mp_last = m_at;
4963		}
4964		if ((mp_last == NULL) || sctp_add_pad_tombuf(mp_last, padding_len)) {
4965			sctp_m_freem(m);
4966			return;
4967		}
4968	}
4969	SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4970	ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4971	    (struct sockaddr *)&net->ro._l_addr,
4972	    m, 0, NULL, 0, 0, 0, 0,
4973	    inp->sctp_lport, stcb->rport, htonl(0),
4974	    net->port, NULL,
4975	    0, 0,
4976	    so_locked);
4977	SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4978	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4979	(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4980}
4981
4982struct mbuf *
4983sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4984    int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4985{
4986	/*
4987	 * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4988	 * being equal to the beginning of the params i.e. (iphlen +
4989	 * sizeof(struct sctp_init_msg) parse through the parameters to the
4990	 * end of the mbuf verifying that all parameters are known.
4991	 *
4992	 * For unknown parameters build and return a mbuf with
4993	 * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4994	 * processing this chunk stop, and set *abort_processing to 1.
4995	 *
4996	 * By having param_offset be pre-set to where parameters begin it is
4997	 * hoped that this routine may be reused in the future by new
4998	 * features.
4999	 */
5000	struct sctp_paramhdr *phdr, params;
5001
5002	struct mbuf *mat, *op_err;
5003	char tempbuf[SCTP_PARAM_BUFFER_SIZE];
5004	int at, limit, pad_needed;
5005	uint16_t ptype, plen, padded_size;
5006	int err_at;
5007
5008	*abort_processing = 0;
5009	mat = in_initpkt;
5010	err_at = 0;
5011	limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
5012	at = param_offset;
5013	op_err = NULL;
5014	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
5015	phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5016	while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
5017		ptype = ntohs(phdr->param_type);
5018		plen = ntohs(phdr->param_length);
5019		if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
5020			/* wacked parameter */
5021			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
5022			goto invalid_size;
5023		}
5024		limit -= SCTP_SIZE32(plen);
5025		/*-
5026		 * All parameters for all chunks that we know/understand are
5027		 * listed here. We process them other places and make
5028		 * appropriate stop actions per the upper bits. However this
5029		 * is the generic routine processor's can call to get back
5030		 * an operr.. to either incorporate (init-ack) or send.
5031		 */
5032		padded_size = SCTP_SIZE32(plen);
5033		switch (ptype) {
5034			/* Param's with variable size */
5035		case SCTP_HEARTBEAT_INFO:
5036		case SCTP_STATE_COOKIE:
5037		case SCTP_UNRECOG_PARAM:
5038		case SCTP_ERROR_CAUSE_IND:
5039			/* ok skip fwd */
5040			at += padded_size;
5041			break;
5042			/* Param's with variable size within a range */
5043		case SCTP_CHUNK_LIST:
5044		case SCTP_SUPPORTED_CHUNK_EXT:
5045			if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
5046				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
5047				goto invalid_size;
5048			}
5049			at += padded_size;
5050			break;
5051		case SCTP_SUPPORTED_ADDRTYPE:
5052			if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
5053				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
5054				goto invalid_size;
5055			}
5056			at += padded_size;
5057			break;
5058		case SCTP_RANDOM:
5059			if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
5060				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
5061				goto invalid_size;
5062			}
5063			at += padded_size;
5064			break;
5065		case SCTP_SET_PRIM_ADDR:
5066		case SCTP_DEL_IP_ADDRESS:
5067		case SCTP_ADD_IP_ADDRESS:
5068			if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
5069			    (padded_size != sizeof(struct sctp_asconf_addr_param))) {
5070				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
5071				goto invalid_size;
5072			}
5073			at += padded_size;
5074			break;
5075			/* Param's with a fixed size */
5076		case SCTP_IPV4_ADDRESS:
5077			if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
5078				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
5079				goto invalid_size;
5080			}
5081			at += padded_size;
5082			break;
5083		case SCTP_IPV6_ADDRESS:
5084			if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5085				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5086				goto invalid_size;
5087			}
5088			at += padded_size;
5089			break;
5090		case SCTP_COOKIE_PRESERVE:
5091			if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5092				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5093				goto invalid_size;
5094			}
5095			at += padded_size;
5096			break;
5097		case SCTP_HAS_NAT_SUPPORT:
5098			*nat_friendly = 1;
5099			/* fall through */
5100		case SCTP_PRSCTP_SUPPORTED:
5101
5102			if (padded_size != sizeof(struct sctp_paramhdr)) {
5103				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5104				goto invalid_size;
5105			}
5106			at += padded_size;
5107			break;
5108		case SCTP_ECN_CAPABLE:
5109			if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
5110				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5111				goto invalid_size;
5112			}
5113			at += padded_size;
5114			break;
5115		case SCTP_ULP_ADAPTATION:
5116			if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5117				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5118				goto invalid_size;
5119			}
5120			at += padded_size;
5121			break;
5122		case SCTP_SUCCESS_REPORT:
5123			if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5124				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5125				goto invalid_size;
5126			}
5127			at += padded_size;
5128			break;
5129		case SCTP_HOSTNAME_ADDRESS:
5130			{
5131				/* We can NOT handle HOST NAME addresses!! */
5132				int l_len;
5133
5134				SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5135				*abort_processing = 1;
5136				if (op_err == NULL) {
5137					/* Ok need to try to get a mbuf */
5138#ifdef INET6
5139					l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5140#else
5141					l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5142#endif
5143					l_len += plen;
5144					l_len += sizeof(struct sctp_paramhdr);
5145					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5146					if (op_err) {
5147						SCTP_BUF_LEN(op_err) = 0;
5148						/*
5149						 * pre-reserve space for ip
5150						 * and sctp header  and
5151						 * chunk hdr
5152						 */
5153#ifdef INET6
5154						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5155#else
5156						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5157#endif
5158						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5159						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5160					}
5161				}
5162				if (op_err) {
5163					/* If we have space */
5164					struct sctp_paramhdr s;
5165
5166					if (err_at % 4) {
5167						uint32_t cpthis = 0;
5168
5169						pad_needed = 4 - (err_at % 4);
5170						m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5171						err_at += pad_needed;
5172					}
5173					s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5174					s.param_length = htons(sizeof(s) + plen);
5175					m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5176					err_at += sizeof(s);
5177					phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5178					if (phdr == NULL) {
5179						sctp_m_freem(op_err);
5180						/*
5181						 * we are out of memory but
5182						 * we still need to have a
5183						 * look at what to do (the
5184						 * system is in trouble
5185						 * though).
5186						 */
5187						return (NULL);
5188					}
5189					m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5190				}
5191				return (op_err);
5192				break;
5193			}
5194		default:
5195			/*
5196			 * we do not recognize the parameter figure out what
5197			 * we do.
5198			 */
5199			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5200			if ((ptype & 0x4000) == 0x4000) {
5201				/* Report bit is set?? */
5202				SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5203				if (op_err == NULL) {
5204					int l_len;
5205
5206					/* Ok need to try to get an mbuf */
5207#ifdef INET6
5208					l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5209#else
5210					l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5211#endif
5212					l_len += plen;
5213					l_len += sizeof(struct sctp_paramhdr);
5214					op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5215					if (op_err) {
5216						SCTP_BUF_LEN(op_err) = 0;
5217#ifdef INET6
5218						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5219#else
5220						SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5221#endif
5222						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5223						SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5224					}
5225				}
5226				if (op_err) {
5227					/* If we have space */
5228					struct sctp_paramhdr s;
5229
5230					if (err_at % 4) {
5231						uint32_t cpthis = 0;
5232
5233						pad_needed = 4 - (err_at % 4);
5234						m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5235						err_at += pad_needed;
5236					}
5237					s.param_type = htons(SCTP_UNRECOG_PARAM);
5238					s.param_length = htons(sizeof(s) + plen);
5239					m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5240					err_at += sizeof(s);
5241					if (plen > sizeof(tempbuf)) {
5242						plen = sizeof(tempbuf);
5243					}
5244					phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5245					if (phdr == NULL) {
5246						sctp_m_freem(op_err);
5247						/*
5248						 * we are out of memory but
5249						 * we still need to have a
5250						 * look at what to do (the
5251						 * system is in trouble
5252						 * though).
5253						 */
5254						op_err = NULL;
5255						goto more_processing;
5256					}
5257					m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5258					err_at += plen;
5259				}
5260			}
5261	more_processing:
5262			if ((ptype & 0x8000) == 0x0000) {
5263				SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5264				return (op_err);
5265			} else {
5266				/* skip this chunk and continue processing */
5267				SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5268				at += SCTP_SIZE32(plen);
5269			}
5270			break;
5271
5272		}
5273		phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5274	}
5275	return (op_err);
5276invalid_size:
5277	SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5278	*abort_processing = 1;
5279	if ((op_err == NULL) && phdr) {
5280		int l_len;
5281
5282#ifdef INET6
5283		l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5284#else
5285		l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5286#endif
5287		l_len += (2 * sizeof(struct sctp_paramhdr));
5288		op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5289		if (op_err) {
5290			SCTP_BUF_LEN(op_err) = 0;
5291#ifdef INET6
5292			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5293#else
5294			SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5295#endif
5296			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5297			SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5298		}
5299	}
5300	if ((op_err) && phdr) {
5301		struct sctp_paramhdr s;
5302
5303		if (err_at % 4) {
5304			uint32_t cpthis = 0;
5305
5306			pad_needed = 4 - (err_at % 4);
5307			m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5308			err_at += pad_needed;
5309		}
5310		s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5311		s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5312		m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5313		err_at += sizeof(s);
5314		/* Only copy back the p-hdr that caused the issue */
5315		m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5316	}
5317	return (op_err);
5318}
5319
5320static int
5321sctp_are_there_new_addresses(struct sctp_association *asoc,
5322    struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5323{
5324	/*
5325	 * Given a INIT packet, look through the packet to verify that there
5326	 * are NO new addresses. As we go through the parameters add reports
5327	 * of any un-understood parameters that require an error.  Also we
5328	 * must return (1) to drop the packet if we see a un-understood
5329	 * parameter that tells us to drop the chunk.
5330	 */
5331	struct sockaddr *sa_touse;
5332	struct sockaddr *sa;
5333	struct sctp_paramhdr *phdr, params;
5334	uint16_t ptype, plen;
5335	uint8_t fnd;
5336	struct sctp_nets *net;
5337
5338#ifdef INET
5339	struct sockaddr_in sin4, *sa4;
5340
5341#endif
5342#ifdef INET6
5343	struct sockaddr_in6 sin6, *sa6;
5344
5345#endif
5346
5347#ifdef INET
5348	memset(&sin4, 0, sizeof(sin4));
5349	sin4.sin_family = AF_INET;
5350	sin4.sin_len = sizeof(sin4);
5351#endif
5352#ifdef INET6
5353	memset(&sin6, 0, sizeof(sin6));
5354	sin6.sin6_family = AF_INET6;
5355	sin6.sin6_len = sizeof(sin6);
5356#endif
5357	/* First what about the src address of the pkt ? */
5358	fnd = 0;
5359	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5360		sa = (struct sockaddr *)&net->ro._l_addr;
5361		if (sa->sa_family == src->sa_family) {
5362#ifdef INET
5363			if (sa->sa_family == AF_INET) {
5364				struct sockaddr_in *src4;
5365
5366				sa4 = (struct sockaddr_in *)sa;
5367				src4 = (struct sockaddr_in *)src;
5368				if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5369					fnd = 1;
5370					break;
5371				}
5372			}
5373#endif
5374#ifdef INET6
5375			if (sa->sa_family == AF_INET6) {
5376				struct sockaddr_in6 *src6;
5377
5378				sa6 = (struct sockaddr_in6 *)sa;
5379				src6 = (struct sockaddr_in6 *)src;
5380				if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5381					fnd = 1;
5382					break;
5383				}
5384			}
5385#endif
5386		}
5387	}
5388	if (fnd == 0) {
5389		/* New address added! no need to look futher. */
5390		return (1);
5391	}
5392	/* Ok so far lets munge through the rest of the packet */
5393	offset += sizeof(struct sctp_init_chunk);
5394	phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5395	while (phdr) {
5396		sa_touse = NULL;
5397		ptype = ntohs(phdr->param_type);
5398		plen = ntohs(phdr->param_length);
5399		switch (ptype) {
5400#ifdef INET
5401		case SCTP_IPV4_ADDRESS:
5402			{
5403				struct sctp_ipv4addr_param *p4, p4_buf;
5404
5405				phdr = sctp_get_next_param(in_initpkt, offset,
5406				    (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5407				if (plen != sizeof(struct sctp_ipv4addr_param) ||
5408				    phdr == NULL) {
5409					return (1);
5410				}
5411				p4 = (struct sctp_ipv4addr_param *)phdr;
5412				sin4.sin_addr.s_addr = p4->addr;
5413				sa_touse = (struct sockaddr *)&sin4;
5414				break;
5415			}
5416#endif
5417#ifdef INET6
5418		case SCTP_IPV6_ADDRESS:
5419			{
5420				struct sctp_ipv6addr_param *p6, p6_buf;
5421
5422				phdr = sctp_get_next_param(in_initpkt, offset,
5423				    (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5424				if (plen != sizeof(struct sctp_ipv6addr_param) ||
5425				    phdr == NULL) {
5426					return (1);
5427				}
5428				p6 = (struct sctp_ipv6addr_param *)phdr;
5429				memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5430				    sizeof(p6->addr));
5431				sa_touse = (struct sockaddr *)&sin6;
5432				break;
5433			}
5434#endif
5435		default:
5436			sa_touse = NULL;
5437			break;
5438		}
5439		if (sa_touse) {
5440			/* ok, sa_touse points to one to check */
5441			fnd = 0;
5442			TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5443				sa = (struct sockaddr *)&net->ro._l_addr;
5444				if (sa->sa_family != sa_touse->sa_family) {
5445					continue;
5446				}
5447#ifdef INET
5448				if (sa->sa_family == AF_INET) {
5449					sa4 = (struct sockaddr_in *)sa;
5450					if (sa4->sin_addr.s_addr ==
5451					    sin4.sin_addr.s_addr) {
5452						fnd = 1;
5453						break;
5454					}
5455				}
5456#endif
5457#ifdef INET6
5458				if (sa->sa_family == AF_INET6) {
5459					sa6 = (struct sockaddr_in6 *)sa;
5460					if (SCTP6_ARE_ADDR_EQUAL(
5461					    sa6, &sin6)) {
5462						fnd = 1;
5463						break;
5464					}
5465				}
5466#endif
5467			}
5468			if (!fnd) {
5469				/* New addr added! no need to look further */
5470				return (1);
5471			}
5472		}
5473		offset += SCTP_SIZE32(plen);
5474		phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5475	}
5476	return (0);
5477}
5478
5479/*
5480 * Given a MBUF chain that was sent into us containing an INIT. Build a
5481 * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5482 * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5483 * message (i.e. the struct sctp_init_msg).
5484 */
5485void
5486sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5487    struct mbuf *init_pkt, int iphlen, int offset,
5488    struct sockaddr *src, struct sockaddr *dst,
5489    struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5490    uint8_t use_mflowid, uint32_t mflowid,
5491    uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5492{
5493	struct sctp_association *asoc;
5494	struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5495	struct sctp_init_ack_chunk *initack;
5496	struct sctp_adaptation_layer_indication *ali;
5497	struct sctp_ecn_supported_param *ecn;
5498	struct sctp_prsctp_supported_param *prsctp;
5499	struct sctp_supported_chunk_types_param *pr_supported;
5500	union sctp_sockstore *over_addr;
5501
5502#ifdef INET
5503	struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5504	struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5505	struct sockaddr_in *sin;
5506
5507#endif
5508#ifdef INET6
5509	struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5510	struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5511	struct sockaddr_in6 *sin6;
5512
5513#endif
5514	struct sockaddr *to;
5515	struct sctp_state_cookie stc;
5516	struct sctp_nets *net = NULL;
5517	uint8_t *signature = NULL;
5518	int cnt_inits_to = 0;
5519	uint16_t his_limit, i_want;
5520	int abort_flag, padval;
5521	int num_ext;
5522	int p_len;
5523	int nat_friendly = 0;
5524	struct socket *so;
5525
5526	if (stcb) {
5527		asoc = &stcb->asoc;
5528	} else {
5529		asoc = NULL;
5530	}
5531	mp_last = NULL;
5532	if ((asoc != NULL) &&
5533	    (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5534	    (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5535		/* new addresses, out of here in non-cookie-wait states */
5536		/*
5537		 * Send a ABORT, we don't add the new address error clause
5538		 * though we even set the T bit and copy in the 0 tag.. this
5539		 * looks no different than if no listener was present.
5540		 */
5541		op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5542		    "Address added");
5543		sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
5544		    use_mflowid, mflowid,
5545		    vrf_id, port);
5546		return;
5547	}
5548	abort_flag = 0;
5549	op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5550	    (offset + sizeof(struct sctp_init_chunk)),
5551	    &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5552	if (abort_flag) {
5553do_a_abort:
5554		if (op_err == NULL) {
5555			char msg[SCTP_DIAG_INFO_LEN];
5556
5557			snprintf(msg, sizeof(msg), "%s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5558			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5559			    msg);
5560		}
5561		sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5562		    init_chk->init.initiate_tag, op_err,
5563		    use_mflowid, mflowid,
5564		    vrf_id, port);
5565		return;
5566	}
5567	m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5568	if (m == NULL) {
5569		/* No memory, INIT timer will re-attempt. */
5570		if (op_err)
5571			sctp_m_freem(op_err);
5572		return;
5573	}
5574	SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5575
5576	/*
5577	 * We might not overwrite the identification[] completely and on
5578	 * some platforms time_entered will contain some padding. Therefore
5579	 * zero out the cookie to avoid putting uninitialized memory on the
5580	 * wire.
5581	 */
5582	memset(&stc, 0, sizeof(struct sctp_state_cookie));
5583
5584	/* the time I built cookie */
5585	(void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5586
5587	/* populate any tie tags */
5588	if (asoc != NULL) {
5589		/* unlock before tag selections */
5590		stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5591		stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5592		stc.cookie_life = asoc->cookie_life;
5593		net = asoc->primary_destination;
5594	} else {
5595		stc.tie_tag_my_vtag = 0;
5596		stc.tie_tag_peer_vtag = 0;
5597		/* life I will award this cookie */
5598		stc.cookie_life = inp->sctp_ep.def_cookie_life;
5599	}
5600
5601	/* copy in the ports for later check */
5602	stc.myport = sh->dest_port;
5603	stc.peerport = sh->src_port;
5604
5605	/*
5606	 * If we wanted to honor cookie life extentions, we would add to
5607	 * stc.cookie_life. For now we should NOT honor any extension
5608	 */
5609	stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5610	if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5611		stc.ipv6_addr_legal = 1;
5612		if (SCTP_IPV6_V6ONLY(inp)) {
5613			stc.ipv4_addr_legal = 0;
5614		} else {
5615			stc.ipv4_addr_legal = 1;
5616		}
5617	} else {
5618		stc.ipv6_addr_legal = 0;
5619		stc.ipv4_addr_legal = 1;
5620	}
5621#ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5622	stc.ipv4_scope = 1;
5623#else
5624	stc.ipv4_scope = 0;
5625#endif
5626	if (net == NULL) {
5627		to = src;
5628		switch (dst->sa_family) {
5629#ifdef INET
5630		case AF_INET:
5631			{
5632				/* lookup address */
5633				stc.address[0] = src4->sin_addr.s_addr;
5634				stc.address[1] = 0;
5635				stc.address[2] = 0;
5636				stc.address[3] = 0;
5637				stc.addr_type = SCTP_IPV4_ADDRESS;
5638				/* local from address */
5639				stc.laddress[0] = dst4->sin_addr.s_addr;
5640				stc.laddress[1] = 0;
5641				stc.laddress[2] = 0;
5642				stc.laddress[3] = 0;
5643				stc.laddr_type = SCTP_IPV4_ADDRESS;
5644				/* scope_id is only for v6 */
5645				stc.scope_id = 0;
5646#ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5647				if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
5648					stc.ipv4_scope = 1;
5649				}
5650#else
5651				stc.ipv4_scope = 1;
5652#endif				/* SCTP_DONT_DO_PRIVADDR_SCOPE */
5653				/* Must use the address in this case */
5654				if (sctp_is_address_on_local_host(src, vrf_id)) {
5655					stc.loopback_scope = 1;
5656					stc.ipv4_scope = 1;
5657					stc.site_scope = 1;
5658					stc.local_scope = 0;
5659				}
5660				break;
5661			}
5662#endif
5663#ifdef INET6
5664		case AF_INET6:
5665			{
5666				stc.addr_type = SCTP_IPV6_ADDRESS;
5667				memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5668				stc.scope_id = in6_getscope(&src6->sin6_addr);
5669				if (sctp_is_address_on_local_host(src, vrf_id)) {
5670					stc.loopback_scope = 1;
5671					stc.local_scope = 0;
5672					stc.site_scope = 1;
5673					stc.ipv4_scope = 1;
5674				} else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
5675					/*
5676					 * If the new destination is a
5677					 * LINK_LOCAL we must have common
5678					 * both site and local scope. Don't
5679					 * set local scope though since we
5680					 * must depend on the source to be
5681					 * added implicitly. We cannot
5682					 * assure just because we share one
5683					 * link that all links are common.
5684					 */
5685					stc.local_scope = 0;
5686					stc.site_scope = 1;
5687					stc.ipv4_scope = 1;
5688					/*
5689					 * we start counting for the private
5690					 * address stuff at 1. since the
5691					 * link local we source from won't
5692					 * show up in our scoped count.
5693					 */
5694					cnt_inits_to = 1;
5695					/*
5696					 * pull out the scope_id from
5697					 * incoming pkt
5698					 */
5699				} else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
5700					/*
5701					 * If the new destination is
5702					 * SITE_LOCAL then we must have site
5703					 * scope in common.
5704					 */
5705					stc.site_scope = 1;
5706				}
5707				memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5708				stc.laddr_type = SCTP_IPV6_ADDRESS;
5709				break;
5710			}
5711#endif
5712		default:
5713			/* TSNH */
5714			goto do_a_abort;
5715			break;
5716		}
5717	} else {
5718		/* set the scope per the existing tcb */
5719
5720#ifdef INET6
5721		struct sctp_nets *lnet;
5722
5723#endif
5724
5725		stc.loopback_scope = asoc->scope.loopback_scope;
5726		stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5727		stc.site_scope = asoc->scope.site_scope;
5728		stc.local_scope = asoc->scope.local_scope;
5729#ifdef INET6
5730		/* Why do we not consider IPv4 LL addresses? */
5731		TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5732			if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5733				if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5734					/*
5735					 * if we have a LL address, start
5736					 * counting at 1.
5737					 */
5738					cnt_inits_to = 1;
5739				}
5740			}
5741		}
5742#endif
5743		/* use the net pointer */
5744		to = (struct sockaddr *)&net->ro._l_addr;
5745		switch (to->sa_family) {
5746#ifdef INET
5747		case AF_INET:
5748			sin = (struct sockaddr_in *)to;
5749			stc.address[0] = sin->sin_addr.s_addr;
5750			stc.address[1] = 0;
5751			stc.address[2] = 0;
5752			stc.address[3] = 0;
5753			stc.addr_type = SCTP_IPV4_ADDRESS;
5754			if (net->src_addr_selected == 0) {
5755				/*
5756				 * strange case here, the INIT should have
5757				 * did the selection.
5758				 */
5759				net->ro._s_addr = sctp_source_address_selection(inp,
5760				    stcb, (sctp_route_t *) & net->ro,
5761				    net, 0, vrf_id);
5762				if (net->ro._s_addr == NULL)
5763					return;
5764
5765				net->src_addr_selected = 1;
5766
5767			}
5768			stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5769			stc.laddress[1] = 0;
5770			stc.laddress[2] = 0;
5771			stc.laddress[3] = 0;
5772			stc.laddr_type = SCTP_IPV4_ADDRESS;
5773			/* scope_id is only for v6 */
5774			stc.scope_id = 0;
5775			break;
5776#endif
5777#ifdef INET6
5778		case AF_INET6:
5779			sin6 = (struct sockaddr_in6 *)to;
5780			memcpy(&stc.address, &sin6->sin6_addr,
5781			    sizeof(struct in6_addr));
5782			stc.addr_type = SCTP_IPV6_ADDRESS;
5783			stc.scope_id = sin6->sin6_scope_id;
5784			if (net->src_addr_selected == 0) {
5785				/*
5786				 * strange case here, the INIT should have
5787				 * done the selection.
5788				 */
5789				net->ro._s_addr = sctp_source_address_selection(inp,
5790				    stcb, (sctp_route_t *) & net->ro,
5791				    net, 0, vrf_id);
5792				if (net->ro._s_addr == NULL)
5793					return;
5794
5795				net->src_addr_selected = 1;
5796			}
5797			memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5798			    sizeof(struct in6_addr));
5799			stc.laddr_type = SCTP_IPV6_ADDRESS;
5800			break;
5801#endif
5802		}
5803	}
5804	/* Now lets put the SCTP header in place */
5805	initack = mtod(m, struct sctp_init_ack_chunk *);
5806	/* Save it off for quick ref */
5807	stc.peers_vtag = init_chk->init.initiate_tag;
5808	/* who are we */
5809	memcpy(stc.identification, SCTP_VERSION_STRING,
5810	    min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5811	memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5812	/* now the chunk header */
5813	initack->ch.chunk_type = SCTP_INITIATION_ACK;
5814	initack->ch.chunk_flags = 0;
5815	/* fill in later from mbuf we build */
5816	initack->ch.chunk_length = 0;
5817	/* place in my tag */
5818	if ((asoc != NULL) &&
5819	    ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5820	    (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5821	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5822		/* re-use the v-tags and init-seq here */
5823		initack->init.initiate_tag = htonl(asoc->my_vtag);
5824		initack->init.initial_tsn = htonl(asoc->init_seq_number);
5825	} else {
5826		uint32_t vtag, itsn;
5827
5828		if (hold_inp_lock) {
5829			SCTP_INP_INCR_REF(inp);
5830			SCTP_INP_RUNLOCK(inp);
5831		}
5832		if (asoc) {
5833			atomic_add_int(&asoc->refcnt, 1);
5834			SCTP_TCB_UNLOCK(stcb);
5835	new_tag:
5836			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5837			if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5838				/*
5839				 * Got a duplicate vtag on some guy behind a
5840				 * nat make sure we don't use it.
5841				 */
5842				goto new_tag;
5843			}
5844			initack->init.initiate_tag = htonl(vtag);
5845			/* get a TSN to use too */
5846			itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5847			initack->init.initial_tsn = htonl(itsn);
5848			SCTP_TCB_LOCK(stcb);
5849			atomic_add_int(&asoc->refcnt, -1);
5850		} else {
5851			vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5852			initack->init.initiate_tag = htonl(vtag);
5853			/* get a TSN to use too */
5854			initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5855		}
5856		if (hold_inp_lock) {
5857			SCTP_INP_RLOCK(inp);
5858			SCTP_INP_DECR_REF(inp);
5859		}
5860	}
5861	/* save away my tag to */
5862	stc.my_vtag = initack->init.initiate_tag;
5863
5864	/* set up some of the credits. */
5865	so = inp->sctp_socket;
5866	if (so == NULL) {
5867		/* memory problem */
5868		sctp_m_freem(m);
5869		return;
5870	} else {
5871		initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5872	}
5873	/* set what I want */
5874	his_limit = ntohs(init_chk->init.num_inbound_streams);
5875	/* choose what I want */
5876	if (asoc != NULL) {
5877		if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5878			i_want = asoc->streamoutcnt;
5879		} else {
5880			i_want = inp->sctp_ep.pre_open_stream_count;
5881		}
5882	} else {
5883		i_want = inp->sctp_ep.pre_open_stream_count;
5884	}
5885	if (his_limit < i_want) {
5886		/* I Want more :< */
5887		initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5888	} else {
5889		/* I can have what I want :> */
5890		initack->init.num_outbound_streams = htons(i_want);
5891	}
5892	/* tell him his limit. */
5893	initack->init.num_inbound_streams =
5894	    htons(inp->sctp_ep.max_open_streams_intome);
5895
5896	/* adaptation layer indication parameter */
5897	if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5898		ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5899		ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5900		ali->ph.param_length = htons(sizeof(*ali));
5901		ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5902		SCTP_BUF_LEN(m) += sizeof(*ali);
5903		ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5904	} else {
5905		ecn = (struct sctp_ecn_supported_param *)((caddr_t)initack + sizeof(*initack));
5906	}
5907
5908	/* ECN parameter */
5909	if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5910	    (inp->sctp_ecn_enable == 1)) {
5911		ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5912		ecn->ph.param_length = htons(sizeof(*ecn));
5913		SCTP_BUF_LEN(m) += sizeof(*ecn);
5914
5915		prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5916		    sizeof(*ecn));
5917	} else {
5918		prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5919	}
5920	/* And now tell the peer we do  pr-sctp */
5921	prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5922	prsctp->ph.param_length = htons(sizeof(*prsctp));
5923	SCTP_BUF_LEN(m) += sizeof(*prsctp);
5924	if (nat_friendly) {
5925		/* Add NAT friendly parameter */
5926		struct sctp_paramhdr *ph;
5927
5928		ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5929		ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5930		ph->param_length = htons(sizeof(struct sctp_paramhdr));
5931		SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5932	}
5933	/* And now tell the peer we do all the extensions */
5934	pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5935	pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5936	num_ext = 0;
5937	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5938	pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5939	pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5940	pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5941	pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5942	if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5943		pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5944	if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5945		pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5946	p_len = sizeof(*pr_supported) + num_ext;
5947	pr_supported->ph.param_length = htons(p_len);
5948	bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5949	SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5950
5951	/* add authentication parameters */
5952	if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5953		struct sctp_auth_random *randp;
5954		struct sctp_auth_hmac_algo *hmacs;
5955		struct sctp_auth_chunk_list *chunks;
5956		uint16_t random_len;
5957
5958		/* generate and add RANDOM parameter */
5959		random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5960		randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5961		randp->ph.param_type = htons(SCTP_RANDOM);
5962		p_len = sizeof(*randp) + random_len;
5963		randp->ph.param_length = htons(p_len);
5964		SCTP_READ_RANDOM(randp->random_data, random_len);
5965		/* zero out any padding required */
5966		bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5967		SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5968
5969		/* add HMAC_ALGO parameter */
5970		hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5971		p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5972		    (uint8_t *) hmacs->hmac_ids);
5973		if (p_len > 0) {
5974			p_len += sizeof(*hmacs);
5975			hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5976			hmacs->ph.param_length = htons(p_len);
5977			/* zero out any padding required */
5978			bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5979			SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5980		}
5981		/* add CHUNKS parameter */
5982		chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5983		p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5984		    chunks->chunk_types);
5985		if (p_len > 0) {
5986			p_len += sizeof(*chunks);
5987			chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5988			chunks->ph.param_length = htons(p_len);
5989			/* zero out any padding required */
5990			bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5991			SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5992		}
5993	}
5994	m_at = m;
5995	/* now the addresses */
5996	{
5997		struct sctp_scoping scp;
5998
5999		/*
6000		 * To optimize this we could put the scoping stuff into a
6001		 * structure and remove the individual uint8's from the stc
6002		 * structure. Then we could just sifa in the address within
6003		 * the stc.. but for now this is a quick hack to get the
6004		 * address stuff teased apart.
6005		 */
6006		scp.ipv4_addr_legal = stc.ipv4_addr_legal;
6007		scp.ipv6_addr_legal = stc.ipv6_addr_legal;
6008		scp.loopback_scope = stc.loopback_scope;
6009		scp.ipv4_local_scope = stc.ipv4_scope;
6010		scp.local_scope = stc.local_scope;
6011		scp.site_scope = stc.site_scope;
6012		m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to, NULL, NULL);
6013	}
6014
6015	/* tack on the operational error if present */
6016	if (op_err) {
6017		struct mbuf *ol;
6018		int llen;
6019
6020		llen = 0;
6021		ol = op_err;
6022
6023		while (ol) {
6024			llen += SCTP_BUF_LEN(ol);
6025			ol = SCTP_BUF_NEXT(ol);
6026		}
6027		if (llen % 4) {
6028			/* must add a pad to the param */
6029			uint32_t cpthis = 0;
6030			int padlen;
6031
6032			padlen = 4 - (llen % 4);
6033			m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
6034		}
6035		while (SCTP_BUF_NEXT(m_at) != NULL) {
6036			m_at = SCTP_BUF_NEXT(m_at);
6037		}
6038		SCTP_BUF_NEXT(m_at) = op_err;
6039		while (SCTP_BUF_NEXT(m_at) != NULL) {
6040			m_at = SCTP_BUF_NEXT(m_at);
6041		}
6042	}
6043	/* pre-calulate the size and update pkt header and chunk header */
6044	p_len = 0;
6045	for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6046		p_len += SCTP_BUF_LEN(m_tmp);
6047		if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6048			/* m_tmp should now point to last one */
6049			break;
6050		}
6051	}
6052
6053	/* Now we must build a cookie */
6054	m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6055	if (m_cookie == NULL) {
6056		/* memory problem */
6057		sctp_m_freem(m);
6058		return;
6059	}
6060	/* Now append the cookie to the end and update the space/size */
6061	SCTP_BUF_NEXT(m_tmp) = m_cookie;
6062
6063	for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6064		p_len += SCTP_BUF_LEN(m_tmp);
6065		if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6066			/* m_tmp should now point to last one */
6067			mp_last = m_tmp;
6068			break;
6069		}
6070	}
6071	/*
6072	 * Place in the size, but we don't include the last pad (if any) in
6073	 * the INIT-ACK.
6074	 */
6075	initack->ch.chunk_length = htons(p_len);
6076
6077	/*
6078	 * Time to sign the cookie, we don't sign over the cookie signature
6079	 * though thus we set trailer.
6080	 */
6081	(void)sctp_hmac_m(SCTP_HMAC,
6082	    (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6083	    SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6084	    (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6085	/*
6086	 * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6087	 * here since the timer will drive a retranmission.
6088	 */
6089	padval = p_len % 4;
6090	if ((padval) && (mp_last)) {
6091		/* see my previous comments on mp_last */
6092		if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
6093			/* Houston we have a problem, no space */
6094			sctp_m_freem(m);
6095			return;
6096		}
6097	}
6098	if (stc.loopback_scope) {
6099		over_addr = (union sctp_sockstore *)dst;
6100	} else {
6101		over_addr = NULL;
6102	}
6103
6104	(void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6105	    0, 0,
6106	    inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6107	    port, over_addr,
6108	    use_mflowid, mflowid,
6109	    SCTP_SO_NOT_LOCKED);
6110	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6111}
6112
6113
6114static void
6115sctp_prune_prsctp(struct sctp_tcb *stcb,
6116    struct sctp_association *asoc,
6117    struct sctp_sndrcvinfo *srcv,
6118    int dataout)
6119{
6120	int freed_spc = 0;
6121	struct sctp_tmit_chunk *chk, *nchk;
6122
6123	SCTP_TCB_LOCK_ASSERT(stcb);
6124	if ((asoc->peer_supports_prsctp) &&
6125	    (asoc->sent_queue_cnt_removeable > 0)) {
6126		TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6127			/*
6128			 * Look for chunks marked with the PR_SCTP flag AND
6129			 * the buffer space flag. If the one being sent is
6130			 * equal or greater priority then purge the old one
6131			 * and free some space.
6132			 */
6133			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6134				/*
6135				 * This one is PR-SCTP AND buffer space
6136				 * limited type
6137				 */
6138				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6139					/*
6140					 * Lower numbers equates to higher
6141					 * priority so if the one we are
6142					 * looking at has a larger or equal
6143					 * priority we want to drop the data
6144					 * and NOT retransmit it.
6145					 */
6146					if (chk->data) {
6147						/*
6148						 * We release the book_size
6149						 * if the mbuf is here
6150						 */
6151						int ret_spc;
6152						uint8_t sent;
6153
6154						if (chk->sent > SCTP_DATAGRAM_UNSENT)
6155							sent = 1;
6156						else
6157							sent = 0;
6158						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6159						    sent,
6160						    SCTP_SO_LOCKED);
6161						freed_spc += ret_spc;
6162						if (freed_spc >= dataout) {
6163							return;
6164						}
6165					}	/* if chunk was present */
6166				}	/* if of sufficent priority */
6167			}	/* if chunk has enabled */
6168		}		/* tailqforeach */
6169
6170		TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6171			/* Here we must move to the sent queue and mark */
6172			if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6173				if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6174					if (chk->data) {
6175						/*
6176						 * We release the book_size
6177						 * if the mbuf is here
6178						 */
6179						int ret_spc;
6180
6181						ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6182						    0, SCTP_SO_LOCKED);
6183
6184						freed_spc += ret_spc;
6185						if (freed_spc >= dataout) {
6186							return;
6187						}
6188					}	/* end if chk->data */
6189				}	/* end if right class */
6190			}	/* end if chk pr-sctp */
6191		}		/* tailqforeachsafe (chk) */
6192	}			/* if enabled in asoc */
6193}
6194
6195int
6196sctp_get_frag_point(struct sctp_tcb *stcb,
6197    struct sctp_association *asoc)
6198{
6199	int siz, ovh;
6200
6201	/*
6202	 * For endpoints that have both v6 and v4 addresses we must reserve
6203	 * room for the ipv6 header, for those that are only dealing with V4
6204	 * we use a larger frag point.
6205	 */
6206	if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6207		ovh = SCTP_MED_OVERHEAD;
6208	} else {
6209		ovh = SCTP_MED_V4_OVERHEAD;
6210	}
6211
6212	if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6213		siz = asoc->smallest_mtu - ovh;
6214	else
6215		siz = (stcb->asoc.sctp_frag_point - ovh);
6216	/*
6217	 * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6218	 */
6219	/* A data chunk MUST fit in a cluster */
6220	/* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6221	/* } */
6222
6223	/* adjust for an AUTH chunk if DATA requires auth */
6224	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6225		siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6226
6227	if (siz % 4) {
6228		/* make it an even word boundary please */
6229		siz -= (siz % 4);
6230	}
6231	return (siz);
6232}
6233
6234static void
6235sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6236{
6237	/*
6238	 * We assume that the user wants PR_SCTP_TTL if the user provides a
6239	 * positive lifetime but does not specify any PR_SCTP policy.
6240	 */
6241	if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6242		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6243	} else if (sp->timetolive > 0) {
6244		sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
6245		sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6246	} else {
6247		return;
6248	}
6249	switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6250	case CHUNK_FLAGS_PR_SCTP_BUF:
6251		/*
6252		 * Time to live is a priority stored in tv_sec when doing
6253		 * the buffer drop thing.
6254		 */
6255		sp->ts.tv_sec = sp->timetolive;
6256		sp->ts.tv_usec = 0;
6257		break;
6258	case CHUNK_FLAGS_PR_SCTP_TTL:
6259		{
6260			struct timeval tv;
6261
6262			(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6263			tv.tv_sec = sp->timetolive / 1000;
6264			tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6265			/*
6266			 * TODO sctp_constants.h needs alternative time
6267			 * macros when _KERNEL is undefined.
6268			 */
6269			timevaladd(&sp->ts, &tv);
6270		}
6271		break;
6272	case CHUNK_FLAGS_PR_SCTP_RTX:
6273		/*
6274		 * Time to live is a the number or retransmissions stored in
6275		 * tv_sec.
6276		 */
6277		sp->ts.tv_sec = sp->timetolive;
6278		sp->ts.tv_usec = 0;
6279		break;
6280	default:
6281		SCTPDBG(SCTP_DEBUG_USRREQ1,
6282		    "Unknown PR_SCTP policy %u.\n",
6283		    PR_SCTP_POLICY(sp->sinfo_flags));
6284		break;
6285	}
6286}
6287
6288static int
6289sctp_msg_append(struct sctp_tcb *stcb,
6290    struct sctp_nets *net,
6291    struct mbuf *m,
6292    struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6293{
6294	int error = 0;
6295	struct mbuf *at;
6296	struct sctp_stream_queue_pending *sp = NULL;
6297	struct sctp_stream_out *strm;
6298
6299	/*
6300	 * Given an mbuf chain, put it into the association send queue and
6301	 * place it on the wheel
6302	 */
6303	if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6304		/* Invalid stream number */
6305		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6306		error = EINVAL;
6307		goto out_now;
6308	}
6309	if ((stcb->asoc.stream_locked) &&
6310	    (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6311		SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6312		error = EINVAL;
6313		goto out_now;
6314	}
6315	strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6316	/* Now can we send this? */
6317	if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6318	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6319	    (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6320	    (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6321		/* got data while shutting down */
6322		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6323		error = ECONNRESET;
6324		goto out_now;
6325	}
6326	sctp_alloc_a_strmoq(stcb, sp);
6327	if (sp == NULL) {
6328		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6329		error = ENOMEM;
6330		goto out_now;
6331	}
6332	sp->sinfo_flags = srcv->sinfo_flags;
6333	sp->timetolive = srcv->sinfo_timetolive;
6334	sp->ppid = srcv->sinfo_ppid;
6335	sp->context = srcv->sinfo_context;
6336	if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6337		sp->net = net;
6338		atomic_add_int(&sp->net->ref_count, 1);
6339	} else {
6340		sp->net = NULL;
6341	}
6342	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6343	sp->stream = srcv->sinfo_stream;
6344	sp->msg_is_complete = 1;
6345	sp->sender_all_done = 1;
6346	sp->some_taken = 0;
6347	sp->data = m;
6348	sp->tail_mbuf = NULL;
6349	sctp_set_prsctp_policy(sp);
6350	/*
6351	 * We could in theory (for sendall) sifa the length in, but we would
6352	 * still have to hunt through the chain since we need to setup the
6353	 * tail_mbuf
6354	 */
6355	sp->length = 0;
6356	for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6357		if (SCTP_BUF_NEXT(at) == NULL)
6358			sp->tail_mbuf = at;
6359		sp->length += SCTP_BUF_LEN(at);
6360	}
6361	if (srcv->sinfo_keynumber_valid) {
6362		sp->auth_keyid = srcv->sinfo_keynumber;
6363	} else {
6364		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6365	}
6366	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6367		sctp_auth_key_acquire(stcb, sp->auth_keyid);
6368		sp->holds_key_ref = 1;
6369	}
6370	if (hold_stcb_lock == 0) {
6371		SCTP_TCB_SEND_LOCK(stcb);
6372	}
6373	sctp_snd_sb_alloc(stcb, sp->length);
6374	atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6375	TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6376	stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6377	m = NULL;
6378	if (hold_stcb_lock == 0) {
6379		SCTP_TCB_SEND_UNLOCK(stcb);
6380	}
6381out_now:
6382	if (m) {
6383		sctp_m_freem(m);
6384	}
6385	return (error);
6386}
6387
6388
6389static struct mbuf *
6390sctp_copy_mbufchain(struct mbuf *clonechain,
6391    struct mbuf *outchain,
6392    struct mbuf **endofchain,
6393    int can_take_mbuf,
6394    int sizeofcpy,
6395    uint8_t copy_by_ref)
6396{
6397	struct mbuf *m;
6398	struct mbuf *appendchain;
6399	caddr_t cp;
6400	int len;
6401
6402	if (endofchain == NULL) {
6403		/* error */
6404error_out:
6405		if (outchain)
6406			sctp_m_freem(outchain);
6407		return (NULL);
6408	}
6409	if (can_take_mbuf) {
6410		appendchain = clonechain;
6411	} else {
6412		if (!copy_by_ref &&
6413		    (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6414		    ) {
6415			/* Its not in a cluster */
6416			if (*endofchain == NULL) {
6417				/* lets get a mbuf cluster */
6418				if (outchain == NULL) {
6419					/* This is the general case */
6420			new_mbuf:
6421					outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6422					if (outchain == NULL) {
6423						goto error_out;
6424					}
6425					SCTP_BUF_LEN(outchain) = 0;
6426					*endofchain = outchain;
6427					/* get the prepend space */
6428					SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6429				} else {
6430					/*
6431					 * We really should not get a NULL
6432					 * in endofchain
6433					 */
6434					/* find end */
6435					m = outchain;
6436					while (m) {
6437						if (SCTP_BUF_NEXT(m) == NULL) {
6438							*endofchain = m;
6439							break;
6440						}
6441						m = SCTP_BUF_NEXT(m);
6442					}
6443					/* sanity */
6444					if (*endofchain == NULL) {
6445						/*
6446						 * huh, TSNH XXX maybe we
6447						 * should panic
6448						 */
6449						sctp_m_freem(outchain);
6450						goto new_mbuf;
6451					}
6452				}
6453				/* get the new end of length */
6454				len = M_TRAILINGSPACE(*endofchain);
6455			} else {
6456				/* how much is left at the end? */
6457				len = M_TRAILINGSPACE(*endofchain);
6458			}
6459			/* Find the end of the data, for appending */
6460			cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6461
6462			/* Now lets copy it out */
6463			if (len >= sizeofcpy) {
6464				/* It all fits, copy it in */
6465				m_copydata(clonechain, 0, sizeofcpy, cp);
6466				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6467			} else {
6468				/* fill up the end of the chain */
6469				if (len > 0) {
6470					m_copydata(clonechain, 0, len, cp);
6471					SCTP_BUF_LEN((*endofchain)) += len;
6472					/* now we need another one */
6473					sizeofcpy -= len;
6474				}
6475				m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6476				if (m == NULL) {
6477					/* We failed */
6478					goto error_out;
6479				}
6480				SCTP_BUF_NEXT((*endofchain)) = m;
6481				*endofchain = m;
6482				cp = mtod((*endofchain), caddr_t);
6483				m_copydata(clonechain, len, sizeofcpy, cp);
6484				SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6485			}
6486			return (outchain);
6487		} else {
6488			/* copy the old fashion way */
6489			appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6490#ifdef SCTP_MBUF_LOGGING
6491			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6492				struct mbuf *mat;
6493
6494				for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6495					if (SCTP_BUF_IS_EXTENDED(mat)) {
6496						sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6497					}
6498				}
6499			}
6500#endif
6501		}
6502	}
6503	if (appendchain == NULL) {
6504		/* error */
6505		if (outchain)
6506			sctp_m_freem(outchain);
6507		return (NULL);
6508	}
6509	if (outchain) {
6510		/* tack on to the end */
6511		if (*endofchain != NULL) {
6512			SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6513		} else {
6514			m = outchain;
6515			while (m) {
6516				if (SCTP_BUF_NEXT(m) == NULL) {
6517					SCTP_BUF_NEXT(m) = appendchain;
6518					break;
6519				}
6520				m = SCTP_BUF_NEXT(m);
6521			}
6522		}
6523		/*
6524		 * save off the end and update the end-chain postion
6525		 */
6526		m = appendchain;
6527		while (m) {
6528			if (SCTP_BUF_NEXT(m) == NULL) {
6529				*endofchain = m;
6530				break;
6531			}
6532			m = SCTP_BUF_NEXT(m);
6533		}
6534		return (outchain);
6535	} else {
6536		/* save off the end and update the end-chain postion */
6537		m = appendchain;
6538		while (m) {
6539			if (SCTP_BUF_NEXT(m) == NULL) {
6540				*endofchain = m;
6541				break;
6542			}
6543			m = SCTP_BUF_NEXT(m);
6544		}
6545		return (appendchain);
6546	}
6547}
6548
6549static int
6550sctp_med_chunk_output(struct sctp_inpcb *inp,
6551    struct sctp_tcb *stcb,
6552    struct sctp_association *asoc,
6553    int *num_out,
6554    int *reason_code,
6555    int control_only, int from_where,
6556    struct timeval *now, int *now_filled, int frag_point, int so_locked
6557#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6558    SCTP_UNUSED
6559#endif
6560);
6561
6562static void
6563sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6564    uint32_t val SCTP_UNUSED)
6565{
6566	struct sctp_copy_all *ca;
6567	struct mbuf *m;
6568	int ret = 0;
6569	int added_control = 0;
6570	int un_sent, do_chunk_output = 1;
6571	struct sctp_association *asoc;
6572	struct sctp_nets *net;
6573
6574	ca = (struct sctp_copy_all *)ptr;
6575	if (ca->m == NULL) {
6576		return;
6577	}
6578	if (ca->inp != inp) {
6579		/* TSNH */
6580		return;
6581	}
6582	if (ca->sndlen > 0) {
6583		m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6584		if (m == NULL) {
6585			/* can't copy so we are done */
6586			ca->cnt_failed++;
6587			return;
6588		}
6589#ifdef SCTP_MBUF_LOGGING
6590		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6591			struct mbuf *mat;
6592
6593			for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6594				if (SCTP_BUF_IS_EXTENDED(mat)) {
6595					sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6596				}
6597			}
6598		}
6599#endif
6600	} else {
6601		m = NULL;
6602	}
6603	SCTP_TCB_LOCK_ASSERT(stcb);
6604	if (stcb->asoc.alternate) {
6605		net = stcb->asoc.alternate;
6606	} else {
6607		net = stcb->asoc.primary_destination;
6608	}
6609	if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6610		/* Abort this assoc with m as the user defined reason */
6611		if (m != NULL) {
6612			SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
6613		} else {
6614			m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
6615			    0, M_NOWAIT, 1, MT_DATA);
6616			SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
6617		}
6618		if (m != NULL) {
6619			struct sctp_paramhdr *ph;
6620
6621			ph = mtod(m, struct sctp_paramhdr *);
6622			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6623			ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
6624		}
6625		/*
6626		 * We add one here to keep the assoc from dis-appearing on
6627		 * us.
6628		 */
6629		atomic_add_int(&stcb->asoc.refcnt, 1);
6630		sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6631		/*
6632		 * sctp_abort_an_association calls sctp_free_asoc() free
6633		 * association will NOT free it since we incremented the
6634		 * refcnt .. we do this to prevent it being freed and things
6635		 * getting tricky since we could end up (from free_asoc)
6636		 * calling inpcb_free which would get a recursive lock call
6637		 * to the iterator lock.. But as a consequence of that the
6638		 * stcb will return to us un-locked.. since free_asoc
6639		 * returns with either no TCB or the TCB unlocked, we must
6640		 * relock.. to unlock in the iterator timer :-0
6641		 */
6642		SCTP_TCB_LOCK(stcb);
6643		atomic_add_int(&stcb->asoc.refcnt, -1);
6644		goto no_chunk_output;
6645	} else {
6646		if (m) {
6647			ret = sctp_msg_append(stcb, net, m,
6648			    &ca->sndrcv, 1);
6649		}
6650		asoc = &stcb->asoc;
6651		if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6652			/* shutdown this assoc */
6653			int cnt;
6654
6655			cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6656
6657			if (TAILQ_EMPTY(&asoc->send_queue) &&
6658			    TAILQ_EMPTY(&asoc->sent_queue) &&
6659			    (cnt == 0)) {
6660				if (asoc->locked_on_sending) {
6661					goto abort_anyway;
6662				}
6663				/*
6664				 * there is nothing queued to send, so I'm
6665				 * done...
6666				 */
6667				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6668				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6669				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6670					/*
6671					 * only send SHUTDOWN the first time
6672					 * through
6673					 */
6674					if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6675						SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6676					}
6677					SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6678					SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6679					sctp_stop_timers_for_shutdown(stcb);
6680					sctp_send_shutdown(stcb, net);
6681					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6682					    net);
6683					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6684					    asoc->primary_destination);
6685					added_control = 1;
6686					do_chunk_output = 0;
6687				}
6688			} else {
6689				/*
6690				 * we still got (or just got) data to send,
6691				 * so set SHUTDOWN_PENDING
6692				 */
6693				/*
6694				 * XXX sockets draft says that SCTP_EOF
6695				 * should be sent with no data.  currently,
6696				 * we will allow user data to be sent first
6697				 * and move to SHUTDOWN-PENDING
6698				 */
6699				if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6700				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6701				    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6702					if (asoc->locked_on_sending) {
6703						/*
6704						 * Locked to send out the
6705						 * data
6706						 */
6707						struct sctp_stream_queue_pending *sp;
6708
6709						sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6710						if (sp) {
6711							if ((sp->length == 0) && (sp->msg_is_complete == 0))
6712								asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6713						}
6714					}
6715					asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6716					if (TAILQ_EMPTY(&asoc->send_queue) &&
6717					    TAILQ_EMPTY(&asoc->sent_queue) &&
6718					    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6719				abort_anyway:
6720						atomic_add_int(&stcb->asoc.refcnt, 1);
6721						sctp_abort_an_association(stcb->sctp_ep, stcb,
6722						    NULL, SCTP_SO_NOT_LOCKED);
6723						atomic_add_int(&stcb->asoc.refcnt, -1);
6724						goto no_chunk_output;
6725					}
6726					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6727					    asoc->primary_destination);
6728				}
6729			}
6730
6731		}
6732	}
6733	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6734	    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6735
6736	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6737	    (stcb->asoc.total_flight > 0) &&
6738	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
6739		do_chunk_output = 0;
6740	}
6741	if (do_chunk_output)
6742		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6743	else if (added_control) {
6744		int num_out = 0, reason = 0, now_filled = 0;
6745		struct timeval now;
6746		int frag_point;
6747
6748		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6749		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6750		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6751	}
6752no_chunk_output:
6753	if (ret) {
6754		ca->cnt_failed++;
6755	} else {
6756		ca->cnt_sent++;
6757	}
6758}
6759
6760static void
6761sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6762{
6763	struct sctp_copy_all *ca;
6764
6765	ca = (struct sctp_copy_all *)ptr;
6766	/*
6767	 * Do a notify here? Kacheong suggests that the notify be done at
6768	 * the send time.. so you would push up a notification if any send
6769	 * failed. Don't know if this is feasable since the only failures we
6770	 * have is "memory" related and if you cannot get an mbuf to send
6771	 * the data you surely can't get an mbuf to send up to notify the
6772	 * user you can't send the data :->
6773	 */
6774
6775	/* now free everything */
6776	sctp_m_freem(ca->m);
6777	SCTP_FREE(ca, SCTP_M_COPYAL);
6778}
6779
6780
6781#define	MC_ALIGN(m, len) do {						\
6782	SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1));	\
6783} while (0)
6784
6785
6786
6787static struct mbuf *
6788sctp_copy_out_all(struct uio *uio, int len)
6789{
6790	struct mbuf *ret, *at;
6791	int left, willcpy, cancpy, error;
6792
6793	ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6794	if (ret == NULL) {
6795		/* TSNH */
6796		return (NULL);
6797	}
6798	left = len;
6799	SCTP_BUF_LEN(ret) = 0;
6800	/* save space for the data chunk header */
6801	cancpy = M_TRAILINGSPACE(ret);
6802	willcpy = min(cancpy, left);
6803	at = ret;
6804	while (left > 0) {
6805		/* Align data to the end */
6806		error = uiomove(mtod(at, caddr_t), willcpy, uio);
6807		if (error) {
6808	err_out_now:
6809			sctp_m_freem(at);
6810			return (NULL);
6811		}
6812		SCTP_BUF_LEN(at) = willcpy;
6813		SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6814		left -= willcpy;
6815		if (left > 0) {
6816			SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6817			if (SCTP_BUF_NEXT(at) == NULL) {
6818				goto err_out_now;
6819			}
6820			at = SCTP_BUF_NEXT(at);
6821			SCTP_BUF_LEN(at) = 0;
6822			cancpy = M_TRAILINGSPACE(at);
6823			willcpy = min(cancpy, left);
6824		}
6825	}
6826	return (ret);
6827}
6828
6829static int
6830sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6831    struct sctp_sndrcvinfo *srcv)
6832{
6833	int ret;
6834	struct sctp_copy_all *ca;
6835
6836	SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6837	    SCTP_M_COPYAL);
6838	if (ca == NULL) {
6839		sctp_m_freem(m);
6840		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6841		return (ENOMEM);
6842	}
6843	memset(ca, 0, sizeof(struct sctp_copy_all));
6844
6845	ca->inp = inp;
6846	if (srcv) {
6847		memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6848	}
6849	/*
6850	 * take off the sendall flag, it would be bad if we failed to do
6851	 * this :-0
6852	 */
6853	ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6854	/* get length and mbuf chain */
6855	if (uio) {
6856		ca->sndlen = uio->uio_resid;
6857		ca->m = sctp_copy_out_all(uio, ca->sndlen);
6858		if (ca->m == NULL) {
6859			SCTP_FREE(ca, SCTP_M_COPYAL);
6860			SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6861			return (ENOMEM);
6862		}
6863	} else {
6864		/* Gather the length of the send */
6865		struct mbuf *mat;
6866
6867		ca->sndlen = 0;
6868		for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6869			ca->sndlen += SCTP_BUF_LEN(mat);
6870		}
6871	}
6872	ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6873	    SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6874	    SCTP_ASOC_ANY_STATE,
6875	    (void *)ca, 0,
6876	    sctp_sendall_completes, inp, 1);
6877	if (ret) {
6878		SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6879		SCTP_FREE(ca, SCTP_M_COPYAL);
6880		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6881		return (EFAULT);
6882	}
6883	return (0);
6884}
6885
6886
6887void
6888sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6889{
6890	struct sctp_tmit_chunk *chk, *nchk;
6891
6892	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6893		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6894			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6895			if (chk->data) {
6896				sctp_m_freem(chk->data);
6897				chk->data = NULL;
6898			}
6899			asoc->ctrl_queue_cnt--;
6900			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6901		}
6902	}
6903}
6904
6905void
6906sctp_toss_old_asconf(struct sctp_tcb *stcb)
6907{
6908	struct sctp_association *asoc;
6909	struct sctp_tmit_chunk *chk, *nchk;
6910	struct sctp_asconf_chunk *acp;
6911
6912	asoc = &stcb->asoc;
6913	TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6914		/* find SCTP_ASCONF chunk in queue */
6915		if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6916			if (chk->data) {
6917				acp = mtod(chk->data, struct sctp_asconf_chunk *);
6918				if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6919					/* Not Acked yet */
6920					break;
6921				}
6922			}
6923			TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6924			if (chk->data) {
6925				sctp_m_freem(chk->data);
6926				chk->data = NULL;
6927			}
6928			asoc->ctrl_queue_cnt--;
6929			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6930		}
6931	}
6932}
6933
6934
6935static void
6936sctp_clean_up_datalist(struct sctp_tcb *stcb,
6937    struct sctp_association *asoc,
6938    struct sctp_tmit_chunk **data_list,
6939    int bundle_at,
6940    struct sctp_nets *net)
6941{
6942	int i;
6943	struct sctp_tmit_chunk *tp1;
6944
6945	for (i = 0; i < bundle_at; i++) {
6946		/* off of the send queue */
6947		TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6948		asoc->send_queue_cnt--;
6949		if (i > 0) {
6950			/*
6951			 * Any chunk NOT 0 you zap the time chunk 0 gets
6952			 * zapped or set based on if a RTO measurment is
6953			 * needed.
6954			 */
6955			data_list[i]->do_rtt = 0;
6956		}
6957		/* record time */
6958		data_list[i]->sent_rcv_time = net->last_sent_time;
6959		data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6960		data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6961		if (data_list[i]->whoTo == NULL) {
6962			data_list[i]->whoTo = net;
6963			atomic_add_int(&net->ref_count, 1);
6964		}
6965		/* on to the sent queue */
6966		tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6967		if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6968			struct sctp_tmit_chunk *tpp;
6969
6970			/* need to move back */
6971	back_up_more:
6972			tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6973			if (tpp == NULL) {
6974				TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6975				goto all_done;
6976			}
6977			tp1 = tpp;
6978			if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6979				goto back_up_more;
6980			}
6981			TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6982		} else {
6983			TAILQ_INSERT_TAIL(&asoc->sent_queue,
6984			    data_list[i],
6985			    sctp_next);
6986		}
6987all_done:
6988		/* This does not lower until the cum-ack passes it */
6989		asoc->sent_queue_cnt++;
6990		if ((asoc->peers_rwnd <= 0) &&
6991		    (asoc->total_flight == 0) &&
6992		    (bundle_at == 1)) {
6993			/* Mark the chunk as being a window probe */
6994			SCTP_STAT_INCR(sctps_windowprobed);
6995		}
6996#ifdef SCTP_AUDITING_ENABLED
6997		sctp_audit_log(0xC2, 3);
6998#endif
6999		data_list[i]->sent = SCTP_DATAGRAM_SENT;
7000		data_list[i]->snd_count = 1;
7001		data_list[i]->rec.data.chunk_was_revoked = 0;
7002		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
7003			sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
7004			    data_list[i]->whoTo->flight_size,
7005			    data_list[i]->book_size,
7006			    (uintptr_t) data_list[i]->whoTo,
7007			    data_list[i]->rec.data.TSN_seq);
7008		}
7009		sctp_flight_size_increase(data_list[i]);
7010		sctp_total_flight_increase(stcb, data_list[i]);
7011		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
7012			sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
7013			    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
7014		}
7015		asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
7016		    (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
7017		if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
7018			/* SWS sender side engages */
7019			asoc->peers_rwnd = 0;
7020		}
7021	}
7022	if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
7023		(*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
7024	}
7025}
7026
7027static void
7028sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
7029#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7030    SCTP_UNUSED
7031#endif
7032)
7033{
7034	struct sctp_tmit_chunk *chk, *nchk;
7035
7036	TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
7037		if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7038		    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
7039		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7040		    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7041		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7042		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7043		    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7044		    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7045		    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7046		    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7047		    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7048		    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7049			/* Stray chunks must be cleaned up */
7050	clean_up_anyway:
7051			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7052			if (chk->data) {
7053				sctp_m_freem(chk->data);
7054				chk->data = NULL;
7055			}
7056			asoc->ctrl_queue_cnt--;
7057			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7058				asoc->fwd_tsn_cnt--;
7059			sctp_free_a_chunk(stcb, chk, so_locked);
7060		} else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7061			/* special handling, we must look into the param */
7062			if (chk != asoc->str_reset) {
7063				goto clean_up_anyway;
7064			}
7065		}
7066	}
7067}
7068
7069
7070static int
7071sctp_can_we_split_this(struct sctp_tcb *stcb,
7072    uint32_t length,
7073    uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7074{
7075	/*
7076	 * Make a decision on if I should split a msg into multiple parts.
7077	 * This is only asked of incomplete messages.
7078	 */
7079	if (eeor_on) {
7080		/*
7081		 * If we are doing EEOR we need to always send it if its the
7082		 * entire thing, since it might be all the guy is putting in
7083		 * the hopper.
7084		 */
7085		if (goal_mtu >= length) {
7086			/*-
7087			 * If we have data outstanding,
7088			 * we get another chance when the sack
7089			 * arrives to transmit - wait for more data
7090			 */
7091			if (stcb->asoc.total_flight == 0) {
7092				/*
7093				 * If nothing is in flight, we zero the
7094				 * packet counter.
7095				 */
7096				return (length);
7097			}
7098			return (0);
7099
7100		} else {
7101			/* You can fill the rest */
7102			return (goal_mtu);
7103		}
7104	}
7105	/*-
7106	 * For those strange folk that make the send buffer
7107	 * smaller than our fragmentation point, we can't
7108	 * get a full msg in so we have to allow splitting.
7109	 */
7110	if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7111		return (length);
7112	}
7113	if ((length <= goal_mtu) ||
7114	    ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7115		/* Sub-optimial residual don't split in non-eeor mode. */
7116		return (0);
7117	}
7118	/*
7119	 * If we reach here length is larger than the goal_mtu. Do we wish
7120	 * to split it for the sake of packet putting together?
7121	 */
7122	if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7123		/* Its ok to split it */
7124		return (min(goal_mtu, frag_point));
7125	}
7126	/* Nope, can't split */
7127	return (0);
7128
7129}
7130
7131static uint32_t
7132sctp_move_to_outqueue(struct sctp_tcb *stcb,
7133    struct sctp_stream_out *strq,
7134    uint32_t goal_mtu,
7135    uint32_t frag_point,
7136    int *locked,
7137    int *giveup,
7138    int eeor_mode,
7139    int *bail,
7140    int so_locked
7141#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7142    SCTP_UNUSED
7143#endif
7144)
7145{
7146	/* Move from the stream to the send_queue keeping track of the total */
7147	struct sctp_association *asoc;
7148	struct sctp_stream_queue_pending *sp;
7149	struct sctp_tmit_chunk *chk;
7150	struct sctp_data_chunk *dchkh;
7151	uint32_t to_move, length;
7152	uint8_t rcv_flags = 0;
7153	uint8_t some_taken;
7154	uint8_t send_lock_up = 0;
7155
7156	SCTP_TCB_LOCK_ASSERT(stcb);
7157	asoc = &stcb->asoc;
7158one_more_time:
7159	/* sa_ignore FREED_MEMORY */
7160	sp = TAILQ_FIRST(&strq->outqueue);
7161	if (sp == NULL) {
7162		*locked = 0;
7163		if (send_lock_up == 0) {
7164			SCTP_TCB_SEND_LOCK(stcb);
7165			send_lock_up = 1;
7166		}
7167		sp = TAILQ_FIRST(&strq->outqueue);
7168		if (sp) {
7169			goto one_more_time;
7170		}
7171		if (strq->last_msg_incomplete) {
7172			SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7173			    strq->stream_no,
7174			    strq->last_msg_incomplete);
7175			strq->last_msg_incomplete = 0;
7176		}
7177		to_move = 0;
7178		if (send_lock_up) {
7179			SCTP_TCB_SEND_UNLOCK(stcb);
7180			send_lock_up = 0;
7181		}
7182		goto out_of;
7183	}
7184	if ((sp->msg_is_complete) && (sp->length == 0)) {
7185		if (sp->sender_all_done) {
7186			/*
7187			 * We are doing differed cleanup. Last time through
7188			 * when we took all the data the sender_all_done was
7189			 * not set.
7190			 */
7191			if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7192				SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7193				SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7194				    sp->sender_all_done,
7195				    sp->length,
7196				    sp->msg_is_complete,
7197				    sp->put_last_out,
7198				    send_lock_up);
7199			}
7200			if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7201				SCTP_TCB_SEND_LOCK(stcb);
7202				send_lock_up = 1;
7203			}
7204			atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7205			TAILQ_REMOVE(&strq->outqueue, sp, next);
7206			stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7207			if (sp->net) {
7208				sctp_free_remote_addr(sp->net);
7209				sp->net = NULL;
7210			}
7211			if (sp->data) {
7212				sctp_m_freem(sp->data);
7213				sp->data = NULL;
7214			}
7215			sctp_free_a_strmoq(stcb, sp, so_locked);
7216			/* we can't be locked to it */
7217			*locked = 0;
7218			stcb->asoc.locked_on_sending = NULL;
7219			if (send_lock_up) {
7220				SCTP_TCB_SEND_UNLOCK(stcb);
7221				send_lock_up = 0;
7222			}
7223			/* back to get the next msg */
7224			goto one_more_time;
7225		} else {
7226			/*
7227			 * sender just finished this but still holds a
7228			 * reference
7229			 */
7230			*locked = 1;
7231			*giveup = 1;
7232			to_move = 0;
7233			goto out_of;
7234		}
7235	} else {
7236		/* is there some to get */
7237		if (sp->length == 0) {
7238			/* no */
7239			*locked = 1;
7240			*giveup = 1;
7241			to_move = 0;
7242			goto out_of;
7243		} else if (sp->discard_rest) {
7244			if (send_lock_up == 0) {
7245				SCTP_TCB_SEND_LOCK(stcb);
7246				send_lock_up = 1;
7247			}
7248			/* Whack down the size */
7249			atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7250			if ((stcb->sctp_socket != NULL) && \
7251			    ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7252			    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7253				atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7254			}
7255			if (sp->data) {
7256				sctp_m_freem(sp->data);
7257				sp->data = NULL;
7258				sp->tail_mbuf = NULL;
7259			}
7260			sp->length = 0;
7261			sp->some_taken = 1;
7262			*locked = 1;
7263			*giveup = 1;
7264			to_move = 0;
7265			goto out_of;
7266		}
7267	}
7268	some_taken = sp->some_taken;
7269	if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7270		sp->msg_is_complete = 1;
7271	}
7272re_look:
7273	length = sp->length;
7274	if (sp->msg_is_complete) {
7275		/* The message is complete */
7276		to_move = min(length, frag_point);
7277		if (to_move == length) {
7278			/* All of it fits in the MTU */
7279			if (sp->some_taken) {
7280				rcv_flags |= SCTP_DATA_LAST_FRAG;
7281				sp->put_last_out = 1;
7282			} else {
7283				rcv_flags |= SCTP_DATA_NOT_FRAG;
7284				sp->put_last_out = 1;
7285			}
7286		} else {
7287			/* Not all of it fits, we fragment */
7288			if (sp->some_taken == 0) {
7289				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7290			}
7291			sp->some_taken = 1;
7292		}
7293	} else {
7294		to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7295		if (to_move) {
7296			/*-
7297			 * We use a snapshot of length in case it
7298			 * is expanding during the compare.
7299			 */
7300			uint32_t llen;
7301
7302			llen = length;
7303			if (to_move >= llen) {
7304				to_move = llen;
7305				if (send_lock_up == 0) {
7306					/*-
7307					 * We are taking all of an incomplete msg
7308					 * thus we need a send lock.
7309					 */
7310					SCTP_TCB_SEND_LOCK(stcb);
7311					send_lock_up = 1;
7312					if (sp->msg_is_complete) {
7313						/*
7314						 * the sender finished the
7315						 * msg
7316						 */
7317						goto re_look;
7318					}
7319				}
7320			}
7321			if (sp->some_taken == 0) {
7322				rcv_flags |= SCTP_DATA_FIRST_FRAG;
7323				sp->some_taken = 1;
7324			}
7325		} else {
7326			/* Nothing to take. */
7327			if (sp->some_taken) {
7328				*locked = 1;
7329			}
7330			*giveup = 1;
7331			to_move = 0;
7332			goto out_of;
7333		}
7334	}
7335
7336	/* If we reach here, we can copy out a chunk */
7337	sctp_alloc_a_chunk(stcb, chk);
7338	if (chk == NULL) {
7339		/* No chunk memory */
7340		*giveup = 1;
7341		to_move = 0;
7342		goto out_of;
7343	}
7344	/*
7345	 * Setup for unordered if needed by looking at the user sent info
7346	 * flags.
7347	 */
7348	if (sp->sinfo_flags & SCTP_UNORDERED) {
7349		rcv_flags |= SCTP_DATA_UNORDERED;
7350	}
7351	if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7352	    ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7353		rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7354	}
7355	/* clear out the chunk before setting up */
7356	memset(chk, 0, sizeof(*chk));
7357	chk->rec.data.rcv_flags = rcv_flags;
7358
7359	if (to_move >= length) {
7360		/* we think we can steal the whole thing */
7361		if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7362			SCTP_TCB_SEND_LOCK(stcb);
7363			send_lock_up = 1;
7364		}
7365		if (to_move < sp->length) {
7366			/* bail, it changed */
7367			goto dont_do_it;
7368		}
7369		chk->data = sp->data;
7370		chk->last_mbuf = sp->tail_mbuf;
7371		/* register the stealing */
7372		sp->data = sp->tail_mbuf = NULL;
7373	} else {
7374		struct mbuf *m;
7375
7376dont_do_it:
7377		chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7378		chk->last_mbuf = NULL;
7379		if (chk->data == NULL) {
7380			sp->some_taken = some_taken;
7381			sctp_free_a_chunk(stcb, chk, so_locked);
7382			*bail = 1;
7383			to_move = 0;
7384			goto out_of;
7385		}
7386#ifdef SCTP_MBUF_LOGGING
7387		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7388			struct mbuf *mat;
7389
7390			for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7391				if (SCTP_BUF_IS_EXTENDED(mat)) {
7392					sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7393				}
7394			}
7395		}
7396#endif
7397		/* Pull off the data */
7398		m_adj(sp->data, to_move);
7399		/* Now lets work our way down and compact it */
7400		m = sp->data;
7401		while (m && (SCTP_BUF_LEN(m) == 0)) {
7402			sp->data = SCTP_BUF_NEXT(m);
7403			SCTP_BUF_NEXT(m) = NULL;
7404			if (sp->tail_mbuf == m) {
7405				/*-
7406				 * Freeing tail? TSNH since
7407				 * we supposedly were taking less
7408				 * than the sp->length.
7409				 */
7410#ifdef INVARIANTS
7411				panic("Huh, freing tail? - TSNH");
7412#else
7413				SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7414				sp->tail_mbuf = sp->data = NULL;
7415				sp->length = 0;
7416#endif
7417
7418			}
7419			sctp_m_free(m);
7420			m = sp->data;
7421		}
7422	}
7423	if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7424		chk->copy_by_ref = 1;
7425	} else {
7426		chk->copy_by_ref = 0;
7427	}
7428	/*
7429	 * get last_mbuf and counts of mb useage This is ugly but hopefully
7430	 * its only one mbuf.
7431	 */
7432	if (chk->last_mbuf == NULL) {
7433		chk->last_mbuf = chk->data;
7434		while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7435			chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7436		}
7437	}
7438	if (to_move > length) {
7439		/*- This should not happen either
7440		 * since we always lower to_move to the size
7441		 * of sp->length if its larger.
7442		 */
7443#ifdef INVARIANTS
7444		panic("Huh, how can to_move be larger?");
7445#else
7446		SCTP_PRINTF("Huh, how can to_move be larger?\n");
7447		sp->length = 0;
7448#endif
7449	} else {
7450		atomic_subtract_int(&sp->length, to_move);
7451	}
7452	if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7453		/* Not enough room for a chunk header, get some */
7454		struct mbuf *m;
7455
7456		m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7457		if (m == NULL) {
7458			/*
7459			 * we're in trouble here. _PREPEND below will free
7460			 * all the data if there is no leading space, so we
7461			 * must put the data back and restore.
7462			 */
7463			if (send_lock_up == 0) {
7464				SCTP_TCB_SEND_LOCK(stcb);
7465				send_lock_up = 1;
7466			}
7467			if (chk->data == NULL) {
7468				/* unsteal the data */
7469				sp->data = chk->data;
7470				sp->tail_mbuf = chk->last_mbuf;
7471			} else {
7472				struct mbuf *m_tmp;
7473
7474				/* reassemble the data */
7475				m_tmp = sp->data;
7476				sp->data = chk->data;
7477				SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7478			}
7479			sp->some_taken = some_taken;
7480			atomic_add_int(&sp->length, to_move);
7481			chk->data = NULL;
7482			*bail = 1;
7483			sctp_free_a_chunk(stcb, chk, so_locked);
7484			to_move = 0;
7485			goto out_of;
7486		} else {
7487			SCTP_BUF_LEN(m) = 0;
7488			SCTP_BUF_NEXT(m) = chk->data;
7489			chk->data = m;
7490			M_ALIGN(chk->data, 4);
7491		}
7492	}
7493	SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7494	if (chk->data == NULL) {
7495		/* HELP, TSNH since we assured it would not above? */
7496#ifdef INVARIANTS
7497		panic("prepend failes HELP?");
7498#else
7499		SCTP_PRINTF("prepend fails HELP?\n");
7500		sctp_free_a_chunk(stcb, chk, so_locked);
7501#endif
7502		*bail = 1;
7503		to_move = 0;
7504		goto out_of;
7505	}
7506	sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7507	chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7508	chk->book_size_scale = 0;
7509	chk->sent = SCTP_DATAGRAM_UNSENT;
7510
7511	chk->flags = 0;
7512	chk->asoc = &stcb->asoc;
7513	chk->pad_inplace = 0;
7514	chk->no_fr_allowed = 0;
7515	chk->rec.data.stream_seq = strq->next_sequence_send;
7516	if ((rcv_flags & SCTP_DATA_LAST_FRAG) &&
7517	    !(rcv_flags & SCTP_DATA_UNORDERED)) {
7518		strq->next_sequence_send++;
7519	}
7520	chk->rec.data.stream_number = sp->stream;
7521	chk->rec.data.payloadtype = sp->ppid;
7522	chk->rec.data.context = sp->context;
7523	chk->rec.data.doing_fast_retransmit = 0;
7524
7525	chk->rec.data.timetodrop = sp->ts;
7526	chk->flags = sp->act_flags;
7527
7528	if (sp->net) {
7529		chk->whoTo = sp->net;
7530		atomic_add_int(&chk->whoTo->ref_count, 1);
7531	} else
7532		chk->whoTo = NULL;
7533
7534	if (sp->holds_key_ref) {
7535		chk->auth_keyid = sp->auth_keyid;
7536		sctp_auth_key_acquire(stcb, chk->auth_keyid);
7537		chk->holds_key_ref = 1;
7538	}
7539	chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7540	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7541		sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7542		    (uintptr_t) stcb, sp->length,
7543		    (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7544		    chk->rec.data.TSN_seq);
7545	}
7546	dchkh = mtod(chk->data, struct sctp_data_chunk *);
7547	/*
7548	 * Put the rest of the things in place now. Size was done earlier in
7549	 * previous loop prior to padding.
7550	 */
7551
7552#ifdef SCTP_ASOCLOG_OF_TSNS
7553	SCTP_TCB_LOCK_ASSERT(stcb);
7554	if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7555		asoc->tsn_out_at = 0;
7556		asoc->tsn_out_wrapped = 1;
7557	}
7558	asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7559	asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7560	asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7561	asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7562	asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7563	asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7564	asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7565	asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7566	asoc->tsn_out_at++;
7567#endif
7568
7569	dchkh->ch.chunk_type = SCTP_DATA;
7570	dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7571	dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7572	dchkh->dp.stream_id = htons(strq->stream_no);
7573	dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7574	dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7575	dchkh->ch.chunk_length = htons(chk->send_size);
7576	/* Now advance the chk->send_size by the actual pad needed. */
7577	if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7578		/* need a pad */
7579		struct mbuf *lm;
7580		int pads;
7581
7582		pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7583		if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7584			chk->pad_inplace = 1;
7585		}
7586		if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7587			/* pad added an mbuf */
7588			chk->last_mbuf = lm;
7589		}
7590		chk->send_size += pads;
7591	}
7592	if (PR_SCTP_ENABLED(chk->flags)) {
7593		asoc->pr_sctp_cnt++;
7594	}
7595	if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7596		/* All done pull and kill the message */
7597		atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7598		if (sp->put_last_out == 0) {
7599			SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7600			SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7601			    sp->sender_all_done,
7602			    sp->length,
7603			    sp->msg_is_complete,
7604			    sp->put_last_out,
7605			    send_lock_up);
7606		}
7607		if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7608			SCTP_TCB_SEND_LOCK(stcb);
7609			send_lock_up = 1;
7610		}
7611		TAILQ_REMOVE(&strq->outqueue, sp, next);
7612		stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7613		if (sp->net) {
7614			sctp_free_remote_addr(sp->net);
7615			sp->net = NULL;
7616		}
7617		if (sp->data) {
7618			sctp_m_freem(sp->data);
7619			sp->data = NULL;
7620		}
7621		sctp_free_a_strmoq(stcb, sp, so_locked);
7622
7623		/* we can't be locked to it */
7624		*locked = 0;
7625		stcb->asoc.locked_on_sending = NULL;
7626	} else {
7627		/* more to go, we are locked */
7628		*locked = 1;
7629	}
7630	asoc->chunks_on_out_queue++;
7631	strq->chunks_on_queues++;
7632	TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7633	asoc->send_queue_cnt++;
7634out_of:
7635	if (send_lock_up) {
7636		SCTP_TCB_SEND_UNLOCK(stcb);
7637	}
7638	return (to_move);
7639}
7640
7641
7642static void
7643sctp_fill_outqueue(struct sctp_tcb *stcb,
7644    struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7645#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7646    SCTP_UNUSED
7647#endif
7648)
7649{
7650	struct sctp_association *asoc;
7651	struct sctp_stream_out *strq;
7652	int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7653	int locked, giveup;
7654
7655	SCTP_TCB_LOCK_ASSERT(stcb);
7656	asoc = &stcb->asoc;
7657	switch (net->ro._l_addr.sa.sa_family) {
7658#ifdef INET
7659	case AF_INET:
7660		goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7661		break;
7662#endif
7663#ifdef INET6
7664	case AF_INET6:
7665		goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7666		break;
7667#endif
7668	default:
7669		/* TSNH */
7670		goal_mtu = net->mtu;
7671		break;
7672	}
7673	/* Need an allowance for the data chunk header too */
7674	goal_mtu -= sizeof(struct sctp_data_chunk);
7675
7676	/* must make even word boundary */
7677	goal_mtu &= 0xfffffffc;
7678	if (asoc->locked_on_sending) {
7679		/* We are stuck on one stream until the message completes. */
7680		strq = asoc->locked_on_sending;
7681		locked = 1;
7682	} else {
7683		strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7684		locked = 0;
7685	}
7686	while ((goal_mtu > 0) && strq) {
7687		giveup = 0;
7688		bail = 0;
7689		moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7690		    &giveup, eeor_mode, &bail, so_locked);
7691		if (moved_how_much)
7692			stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7693
7694		if (locked) {
7695			asoc->locked_on_sending = strq;
7696			if ((moved_how_much == 0) || (giveup) || bail)
7697				/* no more to move for now */
7698				break;
7699		} else {
7700			asoc->locked_on_sending = NULL;
7701			if ((giveup) || bail) {
7702				break;
7703			}
7704			strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7705			if (strq == NULL) {
7706				break;
7707			}
7708		}
7709		total_moved += moved_how_much;
7710		goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7711		goal_mtu &= 0xfffffffc;
7712	}
7713	if (bail)
7714		*quit_now = 1;
7715
7716	stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7717
7718	if (total_moved == 0) {
7719		if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7720		    (net == stcb->asoc.primary_destination)) {
7721			/* ran dry for primary network net */
7722			SCTP_STAT_INCR(sctps_primary_randry);
7723		} else if (stcb->asoc.sctp_cmt_on_off > 0) {
7724			/* ran dry with CMT on */
7725			SCTP_STAT_INCR(sctps_cmt_randry);
7726		}
7727	}
7728}
7729
7730void
7731sctp_fix_ecn_echo(struct sctp_association *asoc)
7732{
7733	struct sctp_tmit_chunk *chk;
7734
7735	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7736		if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7737			chk->sent = SCTP_DATAGRAM_UNSENT;
7738		}
7739	}
7740}
7741
7742void
7743sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7744{
7745	struct sctp_association *asoc;
7746	struct sctp_tmit_chunk *chk;
7747	struct sctp_stream_queue_pending *sp;
7748	unsigned int i;
7749
7750	if (net == NULL) {
7751		return;
7752	}
7753	asoc = &stcb->asoc;
7754	for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7755		TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7756			if (sp->net == net) {
7757				sctp_free_remote_addr(sp->net);
7758				sp->net = NULL;
7759			}
7760		}
7761	}
7762	TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7763		if (chk->whoTo == net) {
7764			sctp_free_remote_addr(chk->whoTo);
7765			chk->whoTo = NULL;
7766		}
7767	}
7768}
7769
7770int
7771sctp_med_chunk_output(struct sctp_inpcb *inp,
7772    struct sctp_tcb *stcb,
7773    struct sctp_association *asoc,
7774    int *num_out,
7775    int *reason_code,
7776    int control_only, int from_where,
7777    struct timeval *now, int *now_filled, int frag_point, int so_locked
7778#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7779    SCTP_UNUSED
7780#endif
7781)
7782{
7783	/**
7784	 * Ok this is the generic chunk service queue. we must do the
7785	 * following: - Service the stream queue that is next, moving any
7786	 * message (note I must get a complete message i.e. FIRST/MIDDLE and
7787	 * LAST to the out queue in one pass) and assigning TSN's - Check to
7788	 * see if the cwnd/rwnd allows any output, if so we go ahead and
7789	 * fomulate and send the low level chunks. Making sure to combine
7790	 * any control in the control chunk queue also.
7791	 */
7792	struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7793	struct mbuf *outchain, *endoutchain;
7794	struct sctp_tmit_chunk *chk, *nchk;
7795
7796	/* temp arrays for unlinking */
7797	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7798	int no_fragmentflg, error;
7799	unsigned int max_rwnd_per_dest, max_send_per_dest;
7800	int one_chunk, hbflag, skip_data_for_this_net;
7801	int asconf, cookie, no_out_cnt;
7802	int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7803	unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7804	int tsns_sent = 0;
7805	uint32_t auth_offset = 0;
7806	struct sctp_auth_chunk *auth = NULL;
7807	uint16_t auth_keyid;
7808	int override_ok = 1;
7809	int skip_fill_up = 0;
7810	int data_auth_reqd = 0;
7811
7812	/*
7813	 * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7814	 * destination.
7815	 */
7816	int quit_now = 0;
7817
7818	*num_out = 0;
7819	auth_keyid = stcb->asoc.authinfo.active_keyid;
7820
7821	if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7822	    (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7823	    (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7824		eeor_mode = 1;
7825	} else {
7826		eeor_mode = 0;
7827	}
7828	ctl_cnt = no_out_cnt = asconf = cookie = 0;
7829	/*
7830	 * First lets prime the pump. For each destination, if there is room
7831	 * in the flight size, attempt to pull an MTU's worth out of the
7832	 * stream queues into the general send_queue
7833	 */
7834#ifdef SCTP_AUDITING_ENABLED
7835	sctp_audit_log(0xC2, 2);
7836#endif
7837	SCTP_TCB_LOCK_ASSERT(stcb);
7838	hbflag = 0;
7839	if ((control_only) || (asoc->stream_reset_outstanding))
7840		no_data_chunks = 1;
7841	else
7842		no_data_chunks = 0;
7843
7844	/* Nothing to possible to send? */
7845	if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7846	    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7847	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7848	    TAILQ_EMPTY(&asoc->send_queue) &&
7849	    stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7850nothing_to_send:
7851		*reason_code = 9;
7852		return (0);
7853	}
7854	if (asoc->peers_rwnd == 0) {
7855		/* No room in peers rwnd */
7856		*reason_code = 1;
7857		if (asoc->total_flight > 0) {
7858			/* we are allowed one chunk in flight */
7859			no_data_chunks = 1;
7860		}
7861	}
7862	if (stcb->asoc.ecn_echo_cnt_onq) {
7863		/* Record where a sack goes, if any */
7864		if (no_data_chunks &&
7865		    (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7866			/* Nothing but ECNe to send - we don't do that */
7867			goto nothing_to_send;
7868		}
7869		TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7870			if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7871			    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7872				sack_goes_to = chk->whoTo;
7873				break;
7874			}
7875		}
7876	}
7877	max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7878	if (stcb->sctp_socket)
7879		max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7880	else
7881		max_send_per_dest = 0;
7882	if (no_data_chunks == 0) {
7883		/* How many non-directed chunks are there? */
7884		TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7885			if (chk->whoTo == NULL) {
7886				/*
7887				 * We already have non-directed chunks on
7888				 * the queue, no need to do a fill-up.
7889				 */
7890				skip_fill_up = 1;
7891				break;
7892			}
7893		}
7894
7895	}
7896	if ((no_data_chunks == 0) &&
7897	    (skip_fill_up == 0) &&
7898	    (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7899		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7900			/*
7901			 * This for loop we are in takes in each net, if
7902			 * its's got space in cwnd and has data sent to it
7903			 * (when CMT is off) then it calls
7904			 * sctp_fill_outqueue for the net. This gets data on
7905			 * the send queue for that network.
7906			 *
7907			 * In sctp_fill_outqueue TSN's are assigned and data is
7908			 * copied out of the stream buffers. Note mostly
7909			 * copy by reference (we hope).
7910			 */
7911			net->window_probe = 0;
7912			if ((net != stcb->asoc.alternate) &&
7913			    ((net->dest_state & SCTP_ADDR_PF) ||
7914			    (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7915			    (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7916				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7917					sctp_log_cwnd(stcb, net, 1,
7918					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7919				}
7920				continue;
7921			}
7922			if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7923			    (net->flight_size == 0)) {
7924				(*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7925			}
7926			if (net->flight_size >= net->cwnd) {
7927				/* skip this network, no room - can't fill */
7928				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7929					sctp_log_cwnd(stcb, net, 3,
7930					    SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7931				}
7932				continue;
7933			}
7934			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7935				sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7936			}
7937			sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7938			if (quit_now) {
7939				/* memory alloc failure */
7940				no_data_chunks = 1;
7941				break;
7942			}
7943		}
7944	}
7945	/* now service each destination and send out what we can for it */
7946	/* Nothing to send? */
7947	if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7948	    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7949	    TAILQ_EMPTY(&asoc->send_queue)) {
7950		*reason_code = 8;
7951		return (0);
7952	}
7953	if (asoc->sctp_cmt_on_off > 0) {
7954		/* get the last start point */
7955		start_at = asoc->last_net_cmt_send_started;
7956		if (start_at == NULL) {
7957			/* null so to beginning */
7958			start_at = TAILQ_FIRST(&asoc->nets);
7959		} else {
7960			start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7961			if (start_at == NULL) {
7962				start_at = TAILQ_FIRST(&asoc->nets);
7963			}
7964		}
7965		asoc->last_net_cmt_send_started = start_at;
7966	} else {
7967		start_at = TAILQ_FIRST(&asoc->nets);
7968	}
7969	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7970		if (chk->whoTo == NULL) {
7971			if (asoc->alternate) {
7972				chk->whoTo = asoc->alternate;
7973			} else {
7974				chk->whoTo = asoc->primary_destination;
7975			}
7976			atomic_add_int(&chk->whoTo->ref_count, 1);
7977		}
7978	}
7979	old_start_at = NULL;
7980again_one_more_time:
7981	for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7982		/* how much can we send? */
7983		/* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7984		if (old_start_at && (old_start_at == net)) {
7985			/* through list ocmpletely. */
7986			break;
7987		}
7988		tsns_sent = 0xa;
7989		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7990		    TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7991		    (net->flight_size >= net->cwnd)) {
7992			/*
7993			 * Nothing on control or asconf and flight is full,
7994			 * we can skip even in the CMT case.
7995			 */
7996			continue;
7997		}
7998		bundle_at = 0;
7999		endoutchain = outchain = NULL;
8000		no_fragmentflg = 1;
8001		one_chunk = 0;
8002		if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
8003			skip_data_for_this_net = 1;
8004		} else {
8005			skip_data_for_this_net = 0;
8006		}
8007		if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
8008			/*
8009			 * if we have a route and an ifp check to see if we
8010			 * have room to send to this guy
8011			 */
8012			struct ifnet *ifp;
8013
8014			ifp = net->ro.ro_rt->rt_ifp;
8015			if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
8016				SCTP_STAT_INCR(sctps_ifnomemqueued);
8017				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
8018					sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
8019				}
8020				continue;
8021			}
8022		}
8023		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8024#ifdef INET
8025		case AF_INET:
8026			mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8027			break;
8028#endif
8029#ifdef INET6
8030		case AF_INET6:
8031			mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8032			break;
8033#endif
8034		default:
8035			/* TSNH */
8036			mtu = net->mtu;
8037			break;
8038		}
8039		mx_mtu = mtu;
8040		to_out = 0;
8041		if (mtu > asoc->peers_rwnd) {
8042			if (asoc->total_flight > 0) {
8043				/* We have a packet in flight somewhere */
8044				r_mtu = asoc->peers_rwnd;
8045			} else {
8046				/* We are always allowed to send one MTU out */
8047				one_chunk = 1;
8048				r_mtu = mtu;
8049			}
8050		} else {
8051			r_mtu = mtu;
8052		}
8053		/************************/
8054		/* ASCONF transmission */
8055		/************************/
8056		/* Now first lets go through the asconf queue */
8057		TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8058			if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8059				continue;
8060			}
8061			if (chk->whoTo == NULL) {
8062				if (asoc->alternate == NULL) {
8063					if (asoc->primary_destination != net) {
8064						break;
8065					}
8066				} else {
8067					if (asoc->alternate != net) {
8068						break;
8069					}
8070				}
8071			} else {
8072				if (chk->whoTo != net) {
8073					break;
8074				}
8075			}
8076			if (chk->data == NULL) {
8077				break;
8078			}
8079			if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8080			    chk->sent != SCTP_DATAGRAM_RESEND) {
8081				break;
8082			}
8083			/*
8084			 * if no AUTH is yet included and this chunk
8085			 * requires it, make sure to account for it.  We
8086			 * don't apply the size until the AUTH chunk is
8087			 * actually added below in case there is no room for
8088			 * this chunk. NOTE: we overload the use of "omtu"
8089			 * here
8090			 */
8091			if ((auth == NULL) &&
8092			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8093			    stcb->asoc.peer_auth_chunks)) {
8094				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8095			} else
8096				omtu = 0;
8097			/* Here we do NOT factor the r_mtu */
8098			if ((chk->send_size < (int)(mtu - omtu)) ||
8099			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8100				/*
8101				 * We probably should glom the mbuf chain
8102				 * from the chk->data for control but the
8103				 * problem is it becomes yet one more level
8104				 * of tracking to do if for some reason
8105				 * output fails. Then I have got to
8106				 * reconstruct the merged control chain.. el
8107				 * yucko.. for now we take the easy way and
8108				 * do the copy
8109				 */
8110				/*
8111				 * Add an AUTH chunk, if chunk requires it
8112				 * save the offset into the chain for AUTH
8113				 */
8114				if ((auth == NULL) &&
8115				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8116				    stcb->asoc.peer_auth_chunks))) {
8117					outchain = sctp_add_auth_chunk(outchain,
8118					    &endoutchain,
8119					    &auth,
8120					    &auth_offset,
8121					    stcb,
8122					    chk->rec.chunk_id.id);
8123					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8124				}
8125				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8126				    (int)chk->rec.chunk_id.can_take_data,
8127				    chk->send_size, chk->copy_by_ref);
8128				if (outchain == NULL) {
8129					*reason_code = 8;
8130					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8131					return (ENOMEM);
8132				}
8133				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8134				/* update our MTU size */
8135				if (mtu > (chk->send_size + omtu))
8136					mtu -= (chk->send_size + omtu);
8137				else
8138					mtu = 0;
8139				to_out += (chk->send_size + omtu);
8140				/* Do clear IP_DF ? */
8141				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8142					no_fragmentflg = 0;
8143				}
8144				if (chk->rec.chunk_id.can_take_data)
8145					chk->data = NULL;
8146				/*
8147				 * set hb flag since we can use these for
8148				 * RTO
8149				 */
8150				hbflag = 1;
8151				asconf = 1;
8152				/*
8153				 * should sysctl this: don't bundle data
8154				 * with ASCONF since it requires AUTH
8155				 */
8156				no_data_chunks = 1;
8157				chk->sent = SCTP_DATAGRAM_SENT;
8158				if (chk->whoTo == NULL) {
8159					chk->whoTo = net;
8160					atomic_add_int(&net->ref_count, 1);
8161				}
8162				chk->snd_count++;
8163				if (mtu == 0) {
8164					/*
8165					 * Ok we are out of room but we can
8166					 * output without effecting the
8167					 * flight size since this little guy
8168					 * is a control only packet.
8169					 */
8170					sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8171					/*
8172					 * do NOT clear the asconf flag as
8173					 * it is used to do appropriate
8174					 * source address selection.
8175					 */
8176					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8177					    (struct sockaddr *)&net->ro._l_addr,
8178					    outchain, auth_offset, auth,
8179					    stcb->asoc.authinfo.active_keyid,
8180					    no_fragmentflg, 0, asconf,
8181					    inp->sctp_lport, stcb->rport,
8182					    htonl(stcb->asoc.peer_vtag),
8183					    net->port, NULL,
8184					    0, 0,
8185					    so_locked))) {
8186						if (error == ENOBUFS) {
8187							asoc->ifp_had_enobuf = 1;
8188							SCTP_STAT_INCR(sctps_lowlevelerr);
8189						}
8190						if (from_where == 0) {
8191							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8192						}
8193						if (*now_filled == 0) {
8194							(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8195							*now_filled = 1;
8196							*now = net->last_sent_time;
8197						} else {
8198							net->last_sent_time = *now;
8199						}
8200						hbflag = 0;
8201						/* error, could not output */
8202						if (error == EHOSTUNREACH) {
8203							/*
8204							 * Destination went
8205							 * unreachable
8206							 * during this send
8207							 */
8208							sctp_move_chunks_from_net(stcb, net);
8209						}
8210						*reason_code = 7;
8211						continue;
8212					} else
8213						asoc->ifp_had_enobuf = 0;
8214					if (*now_filled == 0) {
8215						(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8216						*now_filled = 1;
8217						*now = net->last_sent_time;
8218					} else {
8219						net->last_sent_time = *now;
8220					}
8221					hbflag = 0;
8222					/*
8223					 * increase the number we sent, if a
8224					 * cookie is sent we don't tell them
8225					 * any was sent out.
8226					 */
8227					outchain = endoutchain = NULL;
8228					auth = NULL;
8229					auth_offset = 0;
8230					if (!no_out_cnt)
8231						*num_out += ctl_cnt;
8232					/* recalc a clean slate and setup */
8233					switch (net->ro._l_addr.sa.sa_family) {
8234#ifdef INET
8235					case AF_INET:
8236						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8237						break;
8238#endif
8239#ifdef INET6
8240					case AF_INET6:
8241						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8242						break;
8243#endif
8244					default:
8245						/* TSNH */
8246						mtu = net->mtu;
8247						break;
8248					}
8249					to_out = 0;
8250					no_fragmentflg = 1;
8251				}
8252			}
8253		}
8254		/************************/
8255		/* Control transmission */
8256		/************************/
8257		/* Now first lets go through the control queue */
8258		TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8259			if ((sack_goes_to) &&
8260			    (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8261			    (chk->whoTo != sack_goes_to)) {
8262				/*
8263				 * if we have a sack in queue, and we are
8264				 * looking at an ecn echo that is NOT queued
8265				 * to where the sack is going..
8266				 */
8267				if (chk->whoTo == net) {
8268					/*
8269					 * Don't transmit it to where its
8270					 * going (current net)
8271					 */
8272					continue;
8273				} else if (sack_goes_to == net) {
8274					/*
8275					 * But do transmit it to this
8276					 * address
8277					 */
8278					goto skip_net_check;
8279				}
8280			}
8281			if (chk->whoTo == NULL) {
8282				if (asoc->alternate == NULL) {
8283					if (asoc->primary_destination != net) {
8284						continue;
8285					}
8286				} else {
8287					if (asoc->alternate != net) {
8288						continue;
8289					}
8290				}
8291			} else {
8292				if (chk->whoTo != net) {
8293					continue;
8294				}
8295			}
8296	skip_net_check:
8297			if (chk->data == NULL) {
8298				continue;
8299			}
8300			if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8301				/*
8302				 * It must be unsent. Cookies and ASCONF's
8303				 * hang around but there timers will force
8304				 * when marked for resend.
8305				 */
8306				continue;
8307			}
8308			/*
8309			 * if no AUTH is yet included and this chunk
8310			 * requires it, make sure to account for it.  We
8311			 * don't apply the size until the AUTH chunk is
8312			 * actually added below in case there is no room for
8313			 * this chunk. NOTE: we overload the use of "omtu"
8314			 * here
8315			 */
8316			if ((auth == NULL) &&
8317			    sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8318			    stcb->asoc.peer_auth_chunks)) {
8319				omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8320			} else
8321				omtu = 0;
8322			/* Here we do NOT factor the r_mtu */
8323			if ((chk->send_size <= (int)(mtu - omtu)) ||
8324			    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8325				/*
8326				 * We probably should glom the mbuf chain
8327				 * from the chk->data for control but the
8328				 * problem is it becomes yet one more level
8329				 * of tracking to do if for some reason
8330				 * output fails. Then I have got to
8331				 * reconstruct the merged control chain.. el
8332				 * yucko.. for now we take the easy way and
8333				 * do the copy
8334				 */
8335				/*
8336				 * Add an AUTH chunk, if chunk requires it
8337				 * save the offset into the chain for AUTH
8338				 */
8339				if ((auth == NULL) &&
8340				    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8341				    stcb->asoc.peer_auth_chunks))) {
8342					outchain = sctp_add_auth_chunk(outchain,
8343					    &endoutchain,
8344					    &auth,
8345					    &auth_offset,
8346					    stcb,
8347					    chk->rec.chunk_id.id);
8348					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8349				}
8350				outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8351				    (int)chk->rec.chunk_id.can_take_data,
8352				    chk->send_size, chk->copy_by_ref);
8353				if (outchain == NULL) {
8354					*reason_code = 8;
8355					SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8356					return (ENOMEM);
8357				}
8358				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8359				/* update our MTU size */
8360				if (mtu > (chk->send_size + omtu))
8361					mtu -= (chk->send_size + omtu);
8362				else
8363					mtu = 0;
8364				to_out += (chk->send_size + omtu);
8365				/* Do clear IP_DF ? */
8366				if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8367					no_fragmentflg = 0;
8368				}
8369				if (chk->rec.chunk_id.can_take_data)
8370					chk->data = NULL;
8371				/* Mark things to be removed, if needed */
8372				if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8373				    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||	/* EY */
8374				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8375				    (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8376				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8377				    (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8378				    (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8379				    (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8380				    (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8381				    (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8382				    (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8383					if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8384						hbflag = 1;
8385					}
8386					/* remove these chunks at the end */
8387					if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8388					    (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8389						/* turn off the timer */
8390						if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8391							sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8392							    inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8393						}
8394					}
8395					ctl_cnt++;
8396				} else {
8397					/*
8398					 * Other chunks, since they have
8399					 * timers running (i.e. COOKIE) we
8400					 * just "trust" that it gets sent or
8401					 * retransmitted.
8402					 */
8403					ctl_cnt++;
8404					if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8405						cookie = 1;
8406						no_out_cnt = 1;
8407					} else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8408						/*
8409						 * Increment ecne send count
8410						 * here this means we may be
8411						 * over-zealous in our
8412						 * counting if the send
8413						 * fails, but its the best
8414						 * place to do it (we used
8415						 * to do it in the queue of
8416						 * the chunk, but that did
8417						 * not tell how many times
8418						 * it was sent.
8419						 */
8420						SCTP_STAT_INCR(sctps_sendecne);
8421					}
8422					chk->sent = SCTP_DATAGRAM_SENT;
8423					if (chk->whoTo == NULL) {
8424						chk->whoTo = net;
8425						atomic_add_int(&net->ref_count, 1);
8426					}
8427					chk->snd_count++;
8428				}
8429				if (mtu == 0) {
8430					/*
8431					 * Ok we are out of room but we can
8432					 * output without effecting the
8433					 * flight size since this little guy
8434					 * is a control only packet.
8435					 */
8436					if (asconf) {
8437						sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8438						/*
8439						 * do NOT clear the asconf
8440						 * flag as it is used to do
8441						 * appropriate source
8442						 * address selection.
8443						 */
8444					}
8445					if (cookie) {
8446						sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8447						cookie = 0;
8448					}
8449					if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8450					    (struct sockaddr *)&net->ro._l_addr,
8451					    outchain,
8452					    auth_offset, auth,
8453					    stcb->asoc.authinfo.active_keyid,
8454					    no_fragmentflg, 0, asconf,
8455					    inp->sctp_lport, stcb->rport,
8456					    htonl(stcb->asoc.peer_vtag),
8457					    net->port, NULL,
8458					    0, 0,
8459					    so_locked))) {
8460						if (error == ENOBUFS) {
8461							asoc->ifp_had_enobuf = 1;
8462							SCTP_STAT_INCR(sctps_lowlevelerr);
8463						}
8464						if (from_where == 0) {
8465							SCTP_STAT_INCR(sctps_lowlevelerrusr);
8466						}
8467						/* error, could not output */
8468						if (hbflag) {
8469							if (*now_filled == 0) {
8470								(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8471								*now_filled = 1;
8472								*now = net->last_sent_time;
8473							} else {
8474								net->last_sent_time = *now;
8475							}
8476							hbflag = 0;
8477						}
8478						if (error == EHOSTUNREACH) {
8479							/*
8480							 * Destination went
8481							 * unreachable
8482							 * during this send
8483							 */
8484							sctp_move_chunks_from_net(stcb, net);
8485						}
8486						*reason_code = 7;
8487						continue;
8488					} else
8489						asoc->ifp_had_enobuf = 0;
8490					/* Only HB or ASCONF advances time */
8491					if (hbflag) {
8492						if (*now_filled == 0) {
8493							(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8494							*now_filled = 1;
8495							*now = net->last_sent_time;
8496						} else {
8497							net->last_sent_time = *now;
8498						}
8499						hbflag = 0;
8500					}
8501					/*
8502					 * increase the number we sent, if a
8503					 * cookie is sent we don't tell them
8504					 * any was sent out.
8505					 */
8506					outchain = endoutchain = NULL;
8507					auth = NULL;
8508					auth_offset = 0;
8509					if (!no_out_cnt)
8510						*num_out += ctl_cnt;
8511					/* recalc a clean slate and setup */
8512					switch (net->ro._l_addr.sa.sa_family) {
8513#ifdef INET
8514					case AF_INET:
8515						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8516						break;
8517#endif
8518#ifdef INET6
8519					case AF_INET6:
8520						mtu = net->mtu - SCTP_MIN_OVERHEAD;
8521						break;
8522#endif
8523					default:
8524						/* TSNH */
8525						mtu = net->mtu;
8526						break;
8527					}
8528					to_out = 0;
8529					no_fragmentflg = 1;
8530				}
8531			}
8532		}
8533		/* JRI: if dest is in PF state, do not send data to it */
8534		if ((asoc->sctp_cmt_on_off > 0) &&
8535		    (net != stcb->asoc.alternate) &&
8536		    (net->dest_state & SCTP_ADDR_PF)) {
8537			goto no_data_fill;
8538		}
8539		if (net->flight_size >= net->cwnd) {
8540			goto no_data_fill;
8541		}
8542		if ((asoc->sctp_cmt_on_off > 0) &&
8543		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8544		    (net->flight_size > max_rwnd_per_dest)) {
8545			goto no_data_fill;
8546		}
8547		/*
8548		 * We need a specific accounting for the usage of the send
8549		 * buffer. We also need to check the number of messages per
8550		 * net. For now, this is better than nothing and it disabled
8551		 * by default...
8552		 */
8553		if ((asoc->sctp_cmt_on_off > 0) &&
8554		    (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8555		    (max_send_per_dest > 0) &&
8556		    (net->flight_size > max_send_per_dest)) {
8557			goto no_data_fill;
8558		}
8559		/*********************/
8560		/* Data transmission */
8561		/*********************/
8562		/*
8563		 * if AUTH for DATA is required and no AUTH has been added
8564		 * yet, account for this in the mtu now... if no data can be
8565		 * bundled, this adjustment won't matter anyways since the
8566		 * packet will be going out...
8567		 */
8568		data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8569		    stcb->asoc.peer_auth_chunks);
8570		if (data_auth_reqd && (auth == NULL)) {
8571			mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8572		}
8573		/* now lets add any data within the MTU constraints */
8574		switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8575#ifdef INET
8576		case AF_INET:
8577			if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8578				omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8579			else
8580				omtu = 0;
8581			break;
8582#endif
8583#ifdef INET6
8584		case AF_INET6:
8585			if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8586				omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8587			else
8588				omtu = 0;
8589			break;
8590#endif
8591		default:
8592			/* TSNH */
8593			omtu = 0;
8594			break;
8595		}
8596		if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8597		    (skip_data_for_this_net == 0)) ||
8598		    (cookie)) {
8599			TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8600				if (no_data_chunks) {
8601					/* let only control go out */
8602					*reason_code = 1;
8603					break;
8604				}
8605				if (net->flight_size >= net->cwnd) {
8606					/* skip this net, no room for data */
8607					*reason_code = 2;
8608					break;
8609				}
8610				if ((chk->whoTo != NULL) &&
8611				    (chk->whoTo != net)) {
8612					/* Don't send the chunk on this net */
8613					continue;
8614				}
8615				if (asoc->sctp_cmt_on_off == 0) {
8616					if ((asoc->alternate) &&
8617					    (asoc->alternate != net) &&
8618					    (chk->whoTo == NULL)) {
8619						continue;
8620					} else if ((net != asoc->primary_destination) &&
8621						    (asoc->alternate == NULL) &&
8622					    (chk->whoTo == NULL)) {
8623						continue;
8624					}
8625				}
8626				if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8627					/*-
8628					 * strange, we have a chunk that is
8629					 * to big for its destination and
8630					 * yet no fragment ok flag.
8631					 * Something went wrong when the
8632					 * PMTU changed...we did not mark
8633					 * this chunk for some reason?? I
8634					 * will fix it here by letting IP
8635					 * fragment it for now and printing
8636					 * a warning. This really should not
8637					 * happen ...
8638					 */
8639					SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8640					    chk->send_size, mtu);
8641					chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8642				}
8643				if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8644				    ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8645					struct sctp_data_chunk *dchkh;
8646
8647					dchkh = mtod(chk->data, struct sctp_data_chunk *);
8648					dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8649				}
8650				if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8651				    ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8652					/* ok we will add this one */
8653
8654					/*
8655					 * Add an AUTH chunk, if chunk
8656					 * requires it, save the offset into
8657					 * the chain for AUTH
8658					 */
8659					if (data_auth_reqd) {
8660						if (auth == NULL) {
8661							outchain = sctp_add_auth_chunk(outchain,
8662							    &endoutchain,
8663							    &auth,
8664							    &auth_offset,
8665							    stcb,
8666							    SCTP_DATA);
8667							auth_keyid = chk->auth_keyid;
8668							override_ok = 0;
8669							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8670						} else if (override_ok) {
8671							/*
8672							 * use this data's
8673							 * keyid
8674							 */
8675							auth_keyid = chk->auth_keyid;
8676							override_ok = 0;
8677						} else if (auth_keyid != chk->auth_keyid) {
8678							/*
8679							 * different keyid,
8680							 * so done bundling
8681							 */
8682							break;
8683						}
8684					}
8685					outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8686					    chk->send_size, chk->copy_by_ref);
8687					if (outchain == NULL) {
8688						SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8689						if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8690							sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8691						}
8692						*reason_code = 3;
8693						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8694						return (ENOMEM);
8695					}
8696					/* upate our MTU size */
8697					/* Do clear IP_DF ? */
8698					if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8699						no_fragmentflg = 0;
8700					}
8701					/* unsigned subtraction of mtu */
8702					if (mtu > chk->send_size)
8703						mtu -= chk->send_size;
8704					else
8705						mtu = 0;
8706					/* unsigned subtraction of r_mtu */
8707					if (r_mtu > chk->send_size)
8708						r_mtu -= chk->send_size;
8709					else
8710						r_mtu = 0;
8711
8712					to_out += chk->send_size;
8713					if ((to_out > mx_mtu) && no_fragmentflg) {
8714#ifdef INVARIANTS
8715						panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8716#else
8717						SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8718						    mx_mtu, to_out);
8719#endif
8720					}
8721					chk->window_probe = 0;
8722					data_list[bundle_at++] = chk;
8723					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8724						break;
8725					}
8726					if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8727						if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8728							SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8729						} else {
8730							SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8731						}
8732						if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8733						    ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8734							/*
8735							 * Count number of
8736							 * user msg's that
8737							 * were fragmented
8738							 * we do this by
8739							 * counting when we
8740							 * see a LAST
8741							 * fragment only.
8742							 */
8743							SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8744					}
8745					if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8746						if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8747							data_list[0]->window_probe = 1;
8748							net->window_probe = 1;
8749						}
8750						break;
8751					}
8752				} else {
8753					/*
8754					 * Must be sent in order of the
8755					 * TSN's (on a network)
8756					 */
8757					break;
8758				}
8759			}	/* for (chunk gather loop for this net) */
8760		}		/* if asoc.state OPEN */
8761no_data_fill:
8762		/* Is there something to send for this destination? */
8763		if (outchain) {
8764			/* We may need to start a control timer or two */
8765			if (asconf) {
8766				sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8767				    stcb, net);
8768				/*
8769				 * do NOT clear the asconf flag as it is
8770				 * used to do appropriate source address
8771				 * selection.
8772				 */
8773			}
8774			if (cookie) {
8775				sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8776				cookie = 0;
8777			}
8778			/* must start a send timer if data is being sent */
8779			if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8780				/*
8781				 * no timer running on this destination
8782				 * restart it.
8783				 */
8784				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8785			}
8786			/* Now send it, if there is anything to send :> */
8787			if ((error = sctp_lowlevel_chunk_output(inp,
8788			    stcb,
8789			    net,
8790			    (struct sockaddr *)&net->ro._l_addr,
8791			    outchain,
8792			    auth_offset,
8793			    auth,
8794			    auth_keyid,
8795			    no_fragmentflg,
8796			    bundle_at,
8797			    asconf,
8798			    inp->sctp_lport, stcb->rport,
8799			    htonl(stcb->asoc.peer_vtag),
8800			    net->port, NULL,
8801			    0, 0,
8802			    so_locked))) {
8803				/* error, we could not output */
8804				if (error == ENOBUFS) {
8805					SCTP_STAT_INCR(sctps_lowlevelerr);
8806					asoc->ifp_had_enobuf = 1;
8807				}
8808				if (from_where == 0) {
8809					SCTP_STAT_INCR(sctps_lowlevelerrusr);
8810				}
8811				SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8812				if (hbflag) {
8813					if (*now_filled == 0) {
8814						(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8815						*now_filled = 1;
8816						*now = net->last_sent_time;
8817					} else {
8818						net->last_sent_time = *now;
8819					}
8820					hbflag = 0;
8821				}
8822				if (error == EHOSTUNREACH) {
8823					/*
8824					 * Destination went unreachable
8825					 * during this send
8826					 */
8827					sctp_move_chunks_from_net(stcb, net);
8828				}
8829				*reason_code = 6;
8830				/*-
8831				 * I add this line to be paranoid. As far as
8832				 * I can tell the continue, takes us back to
8833				 * the top of the for, but just to make sure
8834				 * I will reset these again here.
8835				 */
8836				ctl_cnt = bundle_at = 0;
8837				continue;	/* This takes us back to the
8838						 * for() for the nets. */
8839			} else {
8840				asoc->ifp_had_enobuf = 0;
8841			}
8842			endoutchain = NULL;
8843			auth = NULL;
8844			auth_offset = 0;
8845			if (bundle_at || hbflag) {
8846				/* For data/asconf and hb set time */
8847				if (*now_filled == 0) {
8848					(void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8849					*now_filled = 1;
8850					*now = net->last_sent_time;
8851				} else {
8852					net->last_sent_time = *now;
8853				}
8854			}
8855			if (!no_out_cnt) {
8856				*num_out += (ctl_cnt + bundle_at);
8857			}
8858			if (bundle_at) {
8859				/* setup for a RTO measurement */
8860				tsns_sent = data_list[0]->rec.data.TSN_seq;
8861				/* fill time if not already filled */
8862				if (*now_filled == 0) {
8863					(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8864					*now_filled = 1;
8865					*now = asoc->time_last_sent;
8866				} else {
8867					asoc->time_last_sent = *now;
8868				}
8869				if (net->rto_needed) {
8870					data_list[0]->do_rtt = 1;
8871					net->rto_needed = 0;
8872				}
8873				SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8874				sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8875			}
8876			if (one_chunk) {
8877				break;
8878			}
8879		}
8880		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8881			sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8882		}
8883	}
8884	if (old_start_at == NULL) {
8885		old_start_at = start_at;
8886		start_at = TAILQ_FIRST(&asoc->nets);
8887		if (old_start_at)
8888			goto again_one_more_time;
8889	}
8890	/*
8891	 * At the end there should be no NON timed chunks hanging on this
8892	 * queue.
8893	 */
8894	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8895		sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8896	}
8897	if ((*num_out == 0) && (*reason_code == 0)) {
8898		*reason_code = 4;
8899	} else {
8900		*reason_code = 5;
8901	}
8902	sctp_clean_up_ctl(stcb, asoc, so_locked);
8903	return (0);
8904}
8905
8906void
8907sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8908{
8909	/*-
8910	 * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8911	 * the control chunk queue.
8912	 */
8913	struct sctp_chunkhdr *hdr;
8914	struct sctp_tmit_chunk *chk;
8915	struct mbuf *mat;
8916
8917	SCTP_TCB_LOCK_ASSERT(stcb);
8918	sctp_alloc_a_chunk(stcb, chk);
8919	if (chk == NULL) {
8920		/* no memory */
8921		sctp_m_freem(op_err);
8922		return;
8923	}
8924	chk->copy_by_ref = 0;
8925	SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8926	if (op_err == NULL) {
8927		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8928		return;
8929	}
8930	chk->send_size = 0;
8931	mat = op_err;
8932	while (mat != NULL) {
8933		chk->send_size += SCTP_BUF_LEN(mat);
8934		mat = SCTP_BUF_NEXT(mat);
8935	}
8936	chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8937	chk->rec.chunk_id.can_take_data = 1;
8938	chk->sent = SCTP_DATAGRAM_UNSENT;
8939	chk->snd_count = 0;
8940	chk->flags = 0;
8941	chk->asoc = &stcb->asoc;
8942	chk->data = op_err;
8943	chk->whoTo = NULL;
8944	hdr = mtod(op_err, struct sctp_chunkhdr *);
8945	hdr->chunk_type = SCTP_OPERATION_ERROR;
8946	hdr->chunk_flags = 0;
8947	hdr->chunk_length = htons(chk->send_size);
8948	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8949	    chk,
8950	    sctp_next);
8951	chk->asoc->ctrl_queue_cnt++;
8952}
8953
8954int
8955sctp_send_cookie_echo(struct mbuf *m,
8956    int offset,
8957    struct sctp_tcb *stcb,
8958    struct sctp_nets *net)
8959{
8960	/*-
8961	 * pull out the cookie and put it at the front of the control chunk
8962	 * queue.
8963	 */
8964	int at;
8965	struct mbuf *cookie;
8966	struct sctp_paramhdr parm, *phdr;
8967	struct sctp_chunkhdr *hdr;
8968	struct sctp_tmit_chunk *chk;
8969	uint16_t ptype, plen;
8970
8971	/* First find the cookie in the param area */
8972	cookie = NULL;
8973	at = offset + sizeof(struct sctp_init_chunk);
8974
8975	SCTP_TCB_LOCK_ASSERT(stcb);
8976	do {
8977		phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8978		if (phdr == NULL) {
8979			return (-3);
8980		}
8981		ptype = ntohs(phdr->param_type);
8982		plen = ntohs(phdr->param_length);
8983		if (ptype == SCTP_STATE_COOKIE) {
8984			int pad;
8985
8986			/* found the cookie */
8987			if ((pad = (plen % 4))) {
8988				plen += 4 - pad;
8989			}
8990			cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8991			if (cookie == NULL) {
8992				/* No memory */
8993				return (-2);
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 = cookie; 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			break;
9007		}
9008		at += SCTP_SIZE32(plen);
9009	} while (phdr);
9010	if (cookie == NULL) {
9011		/* Did not find the cookie */
9012		return (-3);
9013	}
9014	/* ok, we got the cookie lets change it into a cookie echo chunk */
9015
9016	/* first the change from param to cookie */
9017	hdr = mtod(cookie, struct sctp_chunkhdr *);
9018	hdr->chunk_type = SCTP_COOKIE_ECHO;
9019	hdr->chunk_flags = 0;
9020	/* get the chunk stuff now and place it in the FRONT of the queue */
9021	sctp_alloc_a_chunk(stcb, chk);
9022	if (chk == NULL) {
9023		/* no memory */
9024		sctp_m_freem(cookie);
9025		return (-5);
9026	}
9027	chk->copy_by_ref = 0;
9028	chk->send_size = plen;
9029	chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
9030	chk->rec.chunk_id.can_take_data = 0;
9031	chk->sent = SCTP_DATAGRAM_UNSENT;
9032	chk->snd_count = 0;
9033	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9034	chk->asoc = &stcb->asoc;
9035	chk->data = cookie;
9036	chk->whoTo = net;
9037	atomic_add_int(&chk->whoTo->ref_count, 1);
9038	TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9039	chk->asoc->ctrl_queue_cnt++;
9040	return (0);
9041}
9042
9043void
9044sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9045    struct mbuf *m,
9046    int offset,
9047    int chk_length,
9048    struct sctp_nets *net)
9049{
9050	/*
9051	 * take a HB request and make it into a HB ack and send it.
9052	 */
9053	struct mbuf *outchain;
9054	struct sctp_chunkhdr *chdr;
9055	struct sctp_tmit_chunk *chk;
9056
9057
9058	if (net == NULL)
9059		/* must have a net pointer */
9060		return;
9061
9062	outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
9063	if (outchain == NULL) {
9064		/* gak out of memory */
9065		return;
9066	}
9067#ifdef SCTP_MBUF_LOGGING
9068	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9069		struct mbuf *mat;
9070
9071		for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
9072			if (SCTP_BUF_IS_EXTENDED(mat)) {
9073				sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9074			}
9075		}
9076	}
9077#endif
9078	chdr = mtod(outchain, struct sctp_chunkhdr *);
9079	chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9080	chdr->chunk_flags = 0;
9081	if (chk_length % 4) {
9082		/* need pad */
9083		uint32_t cpthis = 0;
9084		int padlen;
9085
9086		padlen = 4 - (chk_length % 4);
9087		m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9088	}
9089	sctp_alloc_a_chunk(stcb, chk);
9090	if (chk == NULL) {
9091		/* no memory */
9092		sctp_m_freem(outchain);
9093		return;
9094	}
9095	chk->copy_by_ref = 0;
9096	chk->send_size = chk_length;
9097	chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9098	chk->rec.chunk_id.can_take_data = 1;
9099	chk->sent = SCTP_DATAGRAM_UNSENT;
9100	chk->snd_count = 0;
9101	chk->flags = 0;
9102	chk->asoc = &stcb->asoc;
9103	chk->data = outchain;
9104	chk->whoTo = net;
9105	atomic_add_int(&chk->whoTo->ref_count, 1);
9106	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9107	chk->asoc->ctrl_queue_cnt++;
9108}
9109
9110void
9111sctp_send_cookie_ack(struct sctp_tcb *stcb)
9112{
9113	/* formulate and queue a cookie-ack back to sender */
9114	struct mbuf *cookie_ack;
9115	struct sctp_chunkhdr *hdr;
9116	struct sctp_tmit_chunk *chk;
9117
9118	SCTP_TCB_LOCK_ASSERT(stcb);
9119
9120	cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
9121	if (cookie_ack == NULL) {
9122		/* no mbuf's */
9123		return;
9124	}
9125	SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9126	sctp_alloc_a_chunk(stcb, chk);
9127	if (chk == NULL) {
9128		/* no memory */
9129		sctp_m_freem(cookie_ack);
9130		return;
9131	}
9132	chk->copy_by_ref = 0;
9133	chk->send_size = sizeof(struct sctp_chunkhdr);
9134	chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9135	chk->rec.chunk_id.can_take_data = 1;
9136	chk->sent = SCTP_DATAGRAM_UNSENT;
9137	chk->snd_count = 0;
9138	chk->flags = 0;
9139	chk->asoc = &stcb->asoc;
9140	chk->data = cookie_ack;
9141	if (chk->asoc->last_control_chunk_from != NULL) {
9142		chk->whoTo = chk->asoc->last_control_chunk_from;
9143		atomic_add_int(&chk->whoTo->ref_count, 1);
9144	} else {
9145		chk->whoTo = NULL;
9146	}
9147	hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9148	hdr->chunk_type = SCTP_COOKIE_ACK;
9149	hdr->chunk_flags = 0;
9150	hdr->chunk_length = htons(chk->send_size);
9151	SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9152	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9153	chk->asoc->ctrl_queue_cnt++;
9154	return;
9155}
9156
9157
9158void
9159sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9160{
9161	/* formulate and queue a SHUTDOWN-ACK back to the sender */
9162	struct mbuf *m_shutdown_ack;
9163	struct sctp_shutdown_ack_chunk *ack_cp;
9164	struct sctp_tmit_chunk *chk;
9165
9166	m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9167	if (m_shutdown_ack == NULL) {
9168		/* no mbuf's */
9169		return;
9170	}
9171	SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9172	sctp_alloc_a_chunk(stcb, chk);
9173	if (chk == NULL) {
9174		/* no memory */
9175		sctp_m_freem(m_shutdown_ack);
9176		return;
9177	}
9178	chk->copy_by_ref = 0;
9179	chk->send_size = sizeof(struct sctp_chunkhdr);
9180	chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9181	chk->rec.chunk_id.can_take_data = 1;
9182	chk->sent = SCTP_DATAGRAM_UNSENT;
9183	chk->snd_count = 0;
9184	chk->flags = 0;
9185	chk->asoc = &stcb->asoc;
9186	chk->data = m_shutdown_ack;
9187	chk->whoTo = net;
9188	if (chk->whoTo) {
9189		atomic_add_int(&chk->whoTo->ref_count, 1);
9190	}
9191	ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9192	ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9193	ack_cp->ch.chunk_flags = 0;
9194	ack_cp->ch.chunk_length = htons(chk->send_size);
9195	SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9196	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9197	chk->asoc->ctrl_queue_cnt++;
9198	return;
9199}
9200
9201void
9202sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9203{
9204	/* formulate and queue a SHUTDOWN to the sender */
9205	struct mbuf *m_shutdown;
9206	struct sctp_shutdown_chunk *shutdown_cp;
9207	struct sctp_tmit_chunk *chk;
9208
9209	m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9210	if (m_shutdown == NULL) {
9211		/* no mbuf's */
9212		return;
9213	}
9214	SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9215	sctp_alloc_a_chunk(stcb, chk);
9216	if (chk == NULL) {
9217		/* no memory */
9218		sctp_m_freem(m_shutdown);
9219		return;
9220	}
9221	chk->copy_by_ref = 0;
9222	chk->send_size = sizeof(struct sctp_shutdown_chunk);
9223	chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9224	chk->rec.chunk_id.can_take_data = 1;
9225	chk->sent = SCTP_DATAGRAM_UNSENT;
9226	chk->snd_count = 0;
9227	chk->flags = 0;
9228	chk->asoc = &stcb->asoc;
9229	chk->data = m_shutdown;
9230	chk->whoTo = net;
9231	if (chk->whoTo) {
9232		atomic_add_int(&chk->whoTo->ref_count, 1);
9233	}
9234	shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9235	shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9236	shutdown_cp->ch.chunk_flags = 0;
9237	shutdown_cp->ch.chunk_length = htons(chk->send_size);
9238	shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9239	SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9240	TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9241	chk->asoc->ctrl_queue_cnt++;
9242	return;
9243}
9244
9245void
9246sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9247{
9248	/*
9249	 * formulate and queue an ASCONF to the peer. ASCONF parameters
9250	 * should be queued on the assoc queue.
9251	 */
9252	struct sctp_tmit_chunk *chk;
9253	struct mbuf *m_asconf;
9254	int len;
9255
9256	SCTP_TCB_LOCK_ASSERT(stcb);
9257
9258	if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9259	    (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9260		/* can't send a new one if there is one in flight already */
9261		return;
9262	}
9263	/* compose an ASCONF chunk, maximum length is PMTU */
9264	m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9265	if (m_asconf == NULL) {
9266		return;
9267	}
9268	sctp_alloc_a_chunk(stcb, chk);
9269	if (chk == NULL) {
9270		/* no memory */
9271		sctp_m_freem(m_asconf);
9272		return;
9273	}
9274	chk->copy_by_ref = 0;
9275	chk->data = m_asconf;
9276	chk->send_size = len;
9277	chk->rec.chunk_id.id = SCTP_ASCONF;
9278	chk->rec.chunk_id.can_take_data = 0;
9279	chk->sent = SCTP_DATAGRAM_UNSENT;
9280	chk->snd_count = 0;
9281	chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9282	chk->asoc = &stcb->asoc;
9283	chk->whoTo = net;
9284	if (chk->whoTo) {
9285		atomic_add_int(&chk->whoTo->ref_count, 1);
9286	}
9287	TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9288	chk->asoc->ctrl_queue_cnt++;
9289	return;
9290}
9291
9292void
9293sctp_send_asconf_ack(struct sctp_tcb *stcb)
9294{
9295	/*
9296	 * formulate and queue a asconf-ack back to sender. the asconf-ack
9297	 * must be stored in the tcb.
9298	 */
9299	struct sctp_tmit_chunk *chk;
9300	struct sctp_asconf_ack *ack, *latest_ack;
9301	struct mbuf *m_ack;
9302	struct sctp_nets *net = NULL;
9303
9304	SCTP_TCB_LOCK_ASSERT(stcb);
9305	/* Get the latest ASCONF-ACK */
9306	latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9307	if (latest_ack == NULL) {
9308		return;
9309	}
9310	if (latest_ack->last_sent_to != NULL &&
9311	    latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9312		/* we're doing a retransmission */
9313		net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9314		if (net == NULL) {
9315			/* no alternate */
9316			if (stcb->asoc.last_control_chunk_from == NULL) {
9317				if (stcb->asoc.alternate) {
9318					net = stcb->asoc.alternate;
9319				} else {
9320					net = stcb->asoc.primary_destination;
9321				}
9322			} else {
9323				net = stcb->asoc.last_control_chunk_from;
9324			}
9325		}
9326	} else {
9327		/* normal case */
9328		if (stcb->asoc.last_control_chunk_from == NULL) {
9329			if (stcb->asoc.alternate) {
9330				net = stcb->asoc.alternate;
9331			} else {
9332				net = stcb->asoc.primary_destination;
9333			}
9334		} else {
9335			net = stcb->asoc.last_control_chunk_from;
9336		}
9337	}
9338	latest_ack->last_sent_to = net;
9339
9340	TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9341		if (ack->data == NULL) {
9342			continue;
9343		}
9344		/* copy the asconf_ack */
9345		m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9346		if (m_ack == NULL) {
9347			/* couldn't copy it */
9348			return;
9349		}
9350#ifdef SCTP_MBUF_LOGGING
9351		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9352			struct mbuf *mat;
9353
9354			for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9355				if (SCTP_BUF_IS_EXTENDED(mat)) {
9356					sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9357				}
9358			}
9359		}
9360#endif
9361
9362		sctp_alloc_a_chunk(stcb, chk);
9363		if (chk == NULL) {
9364			/* no memory */
9365			if (m_ack)
9366				sctp_m_freem(m_ack);
9367			return;
9368		}
9369		chk->copy_by_ref = 0;
9370
9371		chk->whoTo = net;
9372		if (chk->whoTo) {
9373			atomic_add_int(&chk->whoTo->ref_count, 1);
9374		}
9375		chk->data = m_ack;
9376		chk->send_size = 0;
9377		/* Get size */
9378		chk->send_size = ack->len;
9379		chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9380		chk->rec.chunk_id.can_take_data = 1;
9381		chk->sent = SCTP_DATAGRAM_UNSENT;
9382		chk->snd_count = 0;
9383		chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;	/* XXX */
9384		chk->asoc = &stcb->asoc;
9385
9386		TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9387		chk->asoc->ctrl_queue_cnt++;
9388	}
9389	return;
9390}
9391
9392
9393static int
9394sctp_chunk_retransmission(struct sctp_inpcb *inp,
9395    struct sctp_tcb *stcb,
9396    struct sctp_association *asoc,
9397    int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9398#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9399    SCTP_UNUSED
9400#endif
9401)
9402{
9403	/*-
9404	 * send out one MTU of retransmission. If fast_retransmit is
9405	 * happening we ignore the cwnd. Otherwise we obey the cwnd and
9406	 * rwnd. For a Cookie or Asconf in the control chunk queue we
9407	 * retransmit them by themselves.
9408	 *
9409	 * For data chunks we will pick out the lowest TSN's in the sent_queue
9410	 * marked for resend and bundle them all together (up to a MTU of
9411	 * destination). The address to send to should have been
9412	 * selected/changed where the retransmission was marked (i.e. in FR
9413	 * or t3-timeout routines).
9414	 */
9415	struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9416	struct sctp_tmit_chunk *chk, *fwd;
9417	struct mbuf *m, *endofchain;
9418	struct sctp_nets *net = NULL;
9419	uint32_t tsns_sent = 0;
9420	int no_fragmentflg, bundle_at, cnt_thru;
9421	unsigned int mtu;
9422	int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9423	struct sctp_auth_chunk *auth = NULL;
9424	uint32_t auth_offset = 0;
9425	uint16_t auth_keyid;
9426	int override_ok = 1;
9427	int data_auth_reqd = 0;
9428	uint32_t dmtu = 0;
9429
9430	SCTP_TCB_LOCK_ASSERT(stcb);
9431	tmr_started = ctl_cnt = bundle_at = error = 0;
9432	no_fragmentflg = 1;
9433	fwd_tsn = 0;
9434	*cnt_out = 0;
9435	fwd = NULL;
9436	endofchain = m = NULL;
9437	auth_keyid = stcb->asoc.authinfo.active_keyid;
9438#ifdef SCTP_AUDITING_ENABLED
9439	sctp_audit_log(0xC3, 1);
9440#endif
9441	if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9442	    (TAILQ_EMPTY(&asoc->control_send_queue))) {
9443		SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9444		    asoc->sent_queue_retran_cnt);
9445		asoc->sent_queue_cnt = 0;
9446		asoc->sent_queue_cnt_removeable = 0;
9447		/* send back 0/0 so we enter normal transmission */
9448		*cnt_out = 0;
9449		return (0);
9450	}
9451	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9452		if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9453		    (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9454		    (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9455			if (chk->sent != SCTP_DATAGRAM_RESEND) {
9456				continue;
9457			}
9458			if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9459				if (chk != asoc->str_reset) {
9460					/*
9461					 * not eligible for retran if its
9462					 * not ours
9463					 */
9464					continue;
9465				}
9466			}
9467			ctl_cnt++;
9468			if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9469				fwd_tsn = 1;
9470			}
9471			/*
9472			 * Add an AUTH chunk, if chunk requires it save the
9473			 * offset into the chain for AUTH
9474			 */
9475			if ((auth == NULL) &&
9476			    (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9477			    stcb->asoc.peer_auth_chunks))) {
9478				m = sctp_add_auth_chunk(m, &endofchain,
9479				    &auth, &auth_offset,
9480				    stcb,
9481				    chk->rec.chunk_id.id);
9482				SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9483			}
9484			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9485			break;
9486		}
9487	}
9488	one_chunk = 0;
9489	cnt_thru = 0;
9490	/* do we have control chunks to retransmit? */
9491	if (m != NULL) {
9492		/* Start a timer no matter if we suceed or fail */
9493		if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9494			sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9495		} else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9496			sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9497		chk->snd_count++;	/* update our count */
9498		if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9499		    (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9500		    auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9501		    no_fragmentflg, 0, 0,
9502		    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9503		    chk->whoTo->port, NULL,
9504		    0, 0,
9505		    so_locked))) {
9506			SCTP_STAT_INCR(sctps_lowlevelerr);
9507			return (error);
9508		}
9509		endofchain = NULL;
9510		auth = NULL;
9511		auth_offset = 0;
9512		/*
9513		 * We don't want to mark the net->sent time here since this
9514		 * we use this for HB and retrans cannot measure RTT
9515		 */
9516		/* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9517		*cnt_out += 1;
9518		chk->sent = SCTP_DATAGRAM_SENT;
9519		sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9520		if (fwd_tsn == 0) {
9521			return (0);
9522		} else {
9523			/* Clean up the fwd-tsn list */
9524			sctp_clean_up_ctl(stcb, asoc, so_locked);
9525			return (0);
9526		}
9527	}
9528	/*
9529	 * Ok, it is just data retransmission we need to do or that and a
9530	 * fwd-tsn with it all.
9531	 */
9532	if (TAILQ_EMPTY(&asoc->sent_queue)) {
9533		return (SCTP_RETRAN_DONE);
9534	}
9535	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9536	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9537		/* not yet open, resend the cookie and that is it */
9538		return (1);
9539	}
9540#ifdef SCTP_AUDITING_ENABLED
9541	sctp_auditing(20, inp, stcb, NULL);
9542#endif
9543	data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9544	TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9545		if (chk->sent != SCTP_DATAGRAM_RESEND) {
9546			/* No, not sent to this net or not ready for rtx */
9547			continue;
9548		}
9549		if (chk->data == NULL) {
9550			SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9551			    chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9552			continue;
9553		}
9554		if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9555		    (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9556			/* Gak, we have exceeded max unlucky retran, abort! */
9557			SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9558			    chk->snd_count,
9559			    SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9560			atomic_add_int(&stcb->asoc.refcnt, 1);
9561			sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9562			SCTP_TCB_LOCK(stcb);
9563			atomic_subtract_int(&stcb->asoc.refcnt, 1);
9564			return (SCTP_RETRAN_EXIT);
9565		}
9566		/* pick up the net */
9567		net = chk->whoTo;
9568		switch (net->ro._l_addr.sa.sa_family) {
9569#ifdef INET
9570		case AF_INET:
9571			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9572			break;
9573#endif
9574#ifdef INET6
9575		case AF_INET6:
9576			mtu = net->mtu - SCTP_MIN_OVERHEAD;
9577			break;
9578#endif
9579		default:
9580			/* TSNH */
9581			mtu = net->mtu;
9582			break;
9583		}
9584
9585		if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9586			/* No room in peers rwnd */
9587			uint32_t tsn;
9588
9589			tsn = asoc->last_acked_seq + 1;
9590			if (tsn == chk->rec.data.TSN_seq) {
9591				/*
9592				 * we make a special exception for this
9593				 * case. The peer has no rwnd but is missing
9594				 * the lowest chunk.. which is probably what
9595				 * is holding up the rwnd.
9596				 */
9597				goto one_chunk_around;
9598			}
9599			return (1);
9600		}
9601one_chunk_around:
9602		if (asoc->peers_rwnd < mtu) {
9603			one_chunk = 1;
9604			if ((asoc->peers_rwnd == 0) &&
9605			    (asoc->total_flight == 0)) {
9606				chk->window_probe = 1;
9607				chk->whoTo->window_probe = 1;
9608			}
9609		}
9610#ifdef SCTP_AUDITING_ENABLED
9611		sctp_audit_log(0xC3, 2);
9612#endif
9613		bundle_at = 0;
9614		m = NULL;
9615		net->fast_retran_ip = 0;
9616		if (chk->rec.data.doing_fast_retransmit == 0) {
9617			/*
9618			 * if no FR in progress skip destination that have
9619			 * flight_size > cwnd.
9620			 */
9621			if (net->flight_size >= net->cwnd) {
9622				continue;
9623			}
9624		} else {
9625			/*
9626			 * Mark the destination net to have FR recovery
9627			 * limits put on it.
9628			 */
9629			*fr_done = 1;
9630			net->fast_retran_ip = 1;
9631		}
9632
9633		/*
9634		 * if no AUTH is yet included and this chunk requires it,
9635		 * make sure to account for it.  We don't apply the size
9636		 * until the AUTH chunk is actually added below in case
9637		 * there is no room for this chunk.
9638		 */
9639		if (data_auth_reqd && (auth == NULL)) {
9640			dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9641		} else
9642			dmtu = 0;
9643
9644		if ((chk->send_size <= (mtu - dmtu)) ||
9645		    (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9646			/* ok we will add this one */
9647			if (data_auth_reqd) {
9648				if (auth == NULL) {
9649					m = sctp_add_auth_chunk(m,
9650					    &endofchain,
9651					    &auth,
9652					    &auth_offset,
9653					    stcb,
9654					    SCTP_DATA);
9655					auth_keyid = chk->auth_keyid;
9656					override_ok = 0;
9657					SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9658				} else if (override_ok) {
9659					auth_keyid = chk->auth_keyid;
9660					override_ok = 0;
9661				} else if (chk->auth_keyid != auth_keyid) {
9662					/* different keyid, so done bundling */
9663					break;
9664				}
9665			}
9666			m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9667			if (m == NULL) {
9668				SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9669				return (ENOMEM);
9670			}
9671			/* Do clear IP_DF ? */
9672			if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9673				no_fragmentflg = 0;
9674			}
9675			/* upate our MTU size */
9676			if (mtu > (chk->send_size + dmtu))
9677				mtu -= (chk->send_size + dmtu);
9678			else
9679				mtu = 0;
9680			data_list[bundle_at++] = chk;
9681			if (one_chunk && (asoc->total_flight <= 0)) {
9682				SCTP_STAT_INCR(sctps_windowprobed);
9683			}
9684		}
9685		if (one_chunk == 0) {
9686			/*
9687			 * now are there anymore forward from chk to pick
9688			 * up?
9689			 */
9690			for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9691				if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9692					/* Nope, not for retran */
9693					continue;
9694				}
9695				if (fwd->whoTo != net) {
9696					/* Nope, not the net in question */
9697					continue;
9698				}
9699				if (data_auth_reqd && (auth == NULL)) {
9700					dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9701				} else
9702					dmtu = 0;
9703				if (fwd->send_size <= (mtu - dmtu)) {
9704					if (data_auth_reqd) {
9705						if (auth == NULL) {
9706							m = sctp_add_auth_chunk(m,
9707							    &endofchain,
9708							    &auth,
9709							    &auth_offset,
9710							    stcb,
9711							    SCTP_DATA);
9712							auth_keyid = fwd->auth_keyid;
9713							override_ok = 0;
9714							SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9715						} else if (override_ok) {
9716							auth_keyid = fwd->auth_keyid;
9717							override_ok = 0;
9718						} else if (fwd->auth_keyid != auth_keyid) {
9719							/*
9720							 * different keyid,
9721							 * so done bundling
9722							 */
9723							break;
9724						}
9725					}
9726					m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9727					if (m == NULL) {
9728						SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9729						return (ENOMEM);
9730					}
9731					/* Do clear IP_DF ? */
9732					if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9733						no_fragmentflg = 0;
9734					}
9735					/* upate our MTU size */
9736					if (mtu > (fwd->send_size + dmtu))
9737						mtu -= (fwd->send_size + dmtu);
9738					else
9739						mtu = 0;
9740					data_list[bundle_at++] = fwd;
9741					if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9742						break;
9743					}
9744				} else {
9745					/* can't fit so we are done */
9746					break;
9747				}
9748			}
9749		}
9750		/* Is there something to send for this destination? */
9751		if (m) {
9752			/*
9753			 * No matter if we fail/or suceed we should start a
9754			 * timer. A failure is like a lost IP packet :-)
9755			 */
9756			if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9757				/*
9758				 * no timer running on this destination
9759				 * restart it.
9760				 */
9761				sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9762				tmr_started = 1;
9763			}
9764			/* Now lets send it, if there is anything to send :> */
9765			if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9766			    (struct sockaddr *)&net->ro._l_addr, m,
9767			    auth_offset, auth, auth_keyid,
9768			    no_fragmentflg, 0, 0,
9769			    inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9770			    net->port, NULL,
9771			    0, 0,
9772			    so_locked))) {
9773				/* error, we could not output */
9774				SCTP_STAT_INCR(sctps_lowlevelerr);
9775				return (error);
9776			}
9777			endofchain = NULL;
9778			auth = NULL;
9779			auth_offset = 0;
9780			/* For HB's */
9781			/*
9782			 * We don't want to mark the net->sent time here
9783			 * since this we use this for HB and retrans cannot
9784			 * measure RTT
9785			 */
9786			/* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9787
9788			/* For auto-close */
9789			cnt_thru++;
9790			if (*now_filled == 0) {
9791				(void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9792				*now = asoc->time_last_sent;
9793				*now_filled = 1;
9794			} else {
9795				asoc->time_last_sent = *now;
9796			}
9797			*cnt_out += bundle_at;
9798#ifdef SCTP_AUDITING_ENABLED
9799			sctp_audit_log(0xC4, bundle_at);
9800#endif
9801			if (bundle_at) {
9802				tsns_sent = data_list[0]->rec.data.TSN_seq;
9803			}
9804			for (i = 0; i < bundle_at; i++) {
9805				SCTP_STAT_INCR(sctps_sendretransdata);
9806				data_list[i]->sent = SCTP_DATAGRAM_SENT;
9807				/*
9808				 * When we have a revoked data, and we
9809				 * retransmit it, then we clear the revoked
9810				 * flag since this flag dictates if we
9811				 * subtracted from the fs
9812				 */
9813				if (data_list[i]->rec.data.chunk_was_revoked) {
9814					/* Deflate the cwnd */
9815					data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9816					data_list[i]->rec.data.chunk_was_revoked = 0;
9817				}
9818				data_list[i]->snd_count++;
9819				sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9820				/* record the time */
9821				data_list[i]->sent_rcv_time = asoc->time_last_sent;
9822				if (data_list[i]->book_size_scale) {
9823					/*
9824					 * need to double the book size on
9825					 * this one
9826					 */
9827					data_list[i]->book_size_scale = 0;
9828					/*
9829					 * Since we double the booksize, we
9830					 * must also double the output queue
9831					 * size, since this get shrunk when
9832					 * we free by this amount.
9833					 */
9834					atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9835					data_list[i]->book_size *= 2;
9836
9837
9838				} else {
9839					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9840						sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9841						    asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9842					}
9843					asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9844					    (uint32_t) (data_list[i]->send_size +
9845					    SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9846				}
9847				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9848					sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9849					    data_list[i]->whoTo->flight_size,
9850					    data_list[i]->book_size,
9851					    (uintptr_t) data_list[i]->whoTo,
9852					    data_list[i]->rec.data.TSN_seq);
9853				}
9854				sctp_flight_size_increase(data_list[i]);
9855				sctp_total_flight_increase(stcb, data_list[i]);
9856				if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9857					/* SWS sender side engages */
9858					asoc->peers_rwnd = 0;
9859				}
9860				if ((i == 0) &&
9861				    (data_list[i]->rec.data.doing_fast_retransmit)) {
9862					SCTP_STAT_INCR(sctps_sendfastretrans);
9863					if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9864					    (tmr_started == 0)) {
9865						/*-
9866						 * ok we just fast-retrans'd
9867						 * the lowest TSN, i.e the
9868						 * first on the list. In
9869						 * this case we want to give
9870						 * some more time to get a
9871						 * SACK back without a
9872						 * t3-expiring.
9873						 */
9874						sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9875						    SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9876						sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9877					}
9878				}
9879			}
9880			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9881				sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9882			}
9883#ifdef SCTP_AUDITING_ENABLED
9884			sctp_auditing(21, inp, stcb, NULL);
9885#endif
9886		} else {
9887			/* None will fit */
9888			return (1);
9889		}
9890		if (asoc->sent_queue_retran_cnt <= 0) {
9891			/* all done we have no more to retran */
9892			asoc->sent_queue_retran_cnt = 0;
9893			break;
9894		}
9895		if (one_chunk) {
9896			/* No more room in rwnd */
9897			return (1);
9898		}
9899		/* stop the for loop here. we sent out a packet */
9900		break;
9901	}
9902	return (0);
9903}
9904
9905static void
9906sctp_timer_validation(struct sctp_inpcb *inp,
9907    struct sctp_tcb *stcb,
9908    struct sctp_association *asoc)
9909{
9910	struct sctp_nets *net;
9911
9912	/* Validate that a timer is running somewhere */
9913	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9914		if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9915			/* Here is a timer */
9916			return;
9917		}
9918	}
9919	SCTP_TCB_LOCK_ASSERT(stcb);
9920	/* Gak, we did not have a timer somewhere */
9921	SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9922	if (asoc->alternate) {
9923		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9924	} else {
9925		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9926	}
9927	return;
9928}
9929
9930void
9931sctp_chunk_output(struct sctp_inpcb *inp,
9932    struct sctp_tcb *stcb,
9933    int from_where,
9934    int so_locked
9935#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9936    SCTP_UNUSED
9937#endif
9938)
9939{
9940	/*-
9941	 * Ok this is the generic chunk service queue. we must do the
9942	 * following:
9943	 * - See if there are retransmits pending, if so we must
9944	 *   do these first.
9945	 * - Service the stream queue that is next, moving any
9946	 *   message (note I must get a complete message i.e.
9947	 *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9948	 *   TSN's
9949	 * - Check to see if the cwnd/rwnd allows any output, if so we
9950	 *   go ahead and fomulate and send the low level chunks. Making sure
9951	 *   to combine any control in the control chunk queue also.
9952	 */
9953	struct sctp_association *asoc;
9954	struct sctp_nets *net;
9955	int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9956	unsigned int burst_cnt = 0;
9957	struct timeval now;
9958	int now_filled = 0;
9959	int nagle_on;
9960	int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9961	int un_sent = 0;
9962	int fr_done;
9963	unsigned int tot_frs = 0;
9964
9965	asoc = &stcb->asoc;
9966	/* The Nagle algorithm is only applied when handling a send call. */
9967	if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9968		if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9969			nagle_on = 0;
9970		} else {
9971			nagle_on = 1;
9972		}
9973	} else {
9974		nagle_on = 0;
9975	}
9976	SCTP_TCB_LOCK_ASSERT(stcb);
9977
9978	un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9979
9980	if ((un_sent <= 0) &&
9981	    (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9982	    (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9983	    (asoc->sent_queue_retran_cnt == 0)) {
9984		/* Nothing to do unless there is something to be sent left */
9985		return;
9986	}
9987	/*
9988	 * Do we have something to send, data or control AND a sack timer
9989	 * running, if so piggy-back the sack.
9990	 */
9991	if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9992		sctp_send_sack(stcb, so_locked);
9993		(void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9994	}
9995	while (asoc->sent_queue_retran_cnt) {
9996		/*-
9997		 * Ok, it is retransmission time only, we send out only ONE
9998		 * packet with a single call off to the retran code.
9999		 */
10000		if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10001			/*-
10002			 * Special hook for handling cookiess discarded
10003			 * by peer that carried data. Send cookie-ack only
10004			 * and then the next call with get the retran's.
10005			 */
10006			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10007			    from_where,
10008			    &now, &now_filled, frag_point, so_locked);
10009			return;
10010		} else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10011			/* if its not from a HB then do it */
10012			fr_done = 0;
10013			ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10014			if (fr_done) {
10015				tot_frs++;
10016			}
10017		} else {
10018			/*
10019			 * its from any other place, we don't allow retran
10020			 * output (only control)
10021			 */
10022			ret = 1;
10023		}
10024		if (ret > 0) {
10025			/* Can't send anymore */
10026			/*-
10027			 * now lets push out control by calling med-level
10028			 * output once. this assures that we WILL send HB's
10029			 * if queued too.
10030			 */
10031			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10032			    from_where,
10033			    &now, &now_filled, frag_point, so_locked);
10034#ifdef SCTP_AUDITING_ENABLED
10035			sctp_auditing(8, inp, stcb, NULL);
10036#endif
10037			sctp_timer_validation(inp, stcb, asoc);
10038			return;
10039		}
10040		if (ret < 0) {
10041			/*-
10042			 * The count was off.. retran is not happening so do
10043			 * the normal retransmission.
10044			 */
10045#ifdef SCTP_AUDITING_ENABLED
10046			sctp_auditing(9, inp, stcb, NULL);
10047#endif
10048			if (ret == SCTP_RETRAN_EXIT) {
10049				return;
10050			}
10051			break;
10052		}
10053		if (from_where == SCTP_OUTPUT_FROM_T3) {
10054			/* Only one transmission allowed out of a timeout */
10055#ifdef SCTP_AUDITING_ENABLED
10056			sctp_auditing(10, inp, stcb, NULL);
10057#endif
10058			/* Push out any control */
10059			(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10060			    &now, &now_filled, frag_point, so_locked);
10061			return;
10062		}
10063		if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10064			/* Hit FR burst limit */
10065			return;
10066		}
10067		if ((num_out == 0) && (ret == 0)) {
10068			/* No more retrans to send */
10069			break;
10070		}
10071	}
10072#ifdef SCTP_AUDITING_ENABLED
10073	sctp_auditing(12, inp, stcb, NULL);
10074#endif
10075	/* Check for bad destinations, if they exist move chunks around. */
10076	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10077		if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10078			/*-
10079			 * if possible move things off of this address we
10080			 * still may send below due to the dormant state but
10081			 * we try to find an alternate address to send to
10082			 * and if we have one we move all queued data on the
10083			 * out wheel to this alternate address.
10084			 */
10085			if (net->ref_count > 1)
10086				sctp_move_chunks_from_net(stcb, net);
10087		} else {
10088			/*-
10089			 * if ((asoc->sat_network) || (net->addr_is_local))
10090			 * { burst_limit = asoc->max_burst *
10091			 * SCTP_SAT_NETWORK_BURST_INCR; }
10092			 */
10093			if (asoc->max_burst > 0) {
10094				if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10095					if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10096						/*
10097						 * JRS - Use the congestion
10098						 * control given in the
10099						 * congestion control module
10100						 */
10101						asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10102						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10103							sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10104						}
10105						SCTP_STAT_INCR(sctps_maxburstqueued);
10106					}
10107					net->fast_retran_ip = 0;
10108				} else {
10109					if (net->flight_size == 0) {
10110						/*
10111						 * Should be decaying the
10112						 * cwnd here
10113						 */
10114						;
10115					}
10116				}
10117			}
10118		}
10119
10120	}
10121	burst_cnt = 0;
10122	do {
10123		error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10124		    &reason_code, 0, from_where,
10125		    &now, &now_filled, frag_point, so_locked);
10126		if (error) {
10127			SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10128			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10129				sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10130			}
10131			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10132				sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10133				sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10134			}
10135			break;
10136		}
10137		SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10138
10139		tot_out += num_out;
10140		burst_cnt++;
10141		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10142			sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10143			if (num_out == 0) {
10144				sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10145			}
10146		}
10147		if (nagle_on) {
10148			/*
10149			 * When the Nagle algorithm is used, look at how
10150			 * much is unsent, then if its smaller than an MTU
10151			 * and we have data in flight we stop, except if we
10152			 * are handling a fragmented user message.
10153			 */
10154			un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10155			    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10156			if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10157			    (stcb->asoc.total_flight > 0) &&
10158			    ((stcb->asoc.locked_on_sending == NULL) ||
10159			    sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10160				break;
10161			}
10162		}
10163		if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10164		    TAILQ_EMPTY(&asoc->send_queue) &&
10165		    stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10166			/* Nothing left to send */
10167			break;
10168		}
10169		if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10170			/* Nothing left to send */
10171			break;
10172		}
10173	} while (num_out &&
10174	    ((asoc->max_burst == 0) ||
10175	    SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10176	    (burst_cnt < asoc->max_burst)));
10177
10178	if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10179		if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10180			SCTP_STAT_INCR(sctps_maxburstqueued);
10181			asoc->burst_limit_applied = 1;
10182			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10183				sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10184			}
10185		} else {
10186			asoc->burst_limit_applied = 0;
10187		}
10188	}
10189	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10190		sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10191	}
10192	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10193	    tot_out);
10194
10195	/*-
10196	 * Now we need to clean up the control chunk chain if a ECNE is on
10197	 * it. It must be marked as UNSENT again so next call will continue
10198	 * to send it until such time that we get a CWR, to remove it.
10199	 */
10200	if (stcb->asoc.ecn_echo_cnt_onq)
10201		sctp_fix_ecn_echo(asoc);
10202	return;
10203}
10204
10205
10206int
10207sctp_output(
10208    struct sctp_inpcb *inp,
10209    struct mbuf *m,
10210    struct sockaddr *addr,
10211    struct mbuf *control,
10212    struct thread *p,
10213    int flags)
10214{
10215	if (inp == NULL) {
10216		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10217		return (EINVAL);
10218	}
10219	if (inp->sctp_socket == NULL) {
10220		SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10221		return (EINVAL);
10222	}
10223	return (sctp_sosend(inp->sctp_socket,
10224	    addr,
10225	    (struct uio *)NULL,
10226	    m,
10227	    control,
10228	    flags, p
10229	    ));
10230}
10231
10232void
10233send_forward_tsn(struct sctp_tcb *stcb,
10234    struct sctp_association *asoc)
10235{
10236	struct sctp_tmit_chunk *chk;
10237	struct sctp_forward_tsn_chunk *fwdtsn;
10238	uint32_t advance_peer_ack_point;
10239
10240	SCTP_TCB_LOCK_ASSERT(stcb);
10241	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10242		if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10243			/* mark it to unsent */
10244			chk->sent = SCTP_DATAGRAM_UNSENT;
10245			chk->snd_count = 0;
10246			/* Do we correct its output location? */
10247			if (chk->whoTo) {
10248				sctp_free_remote_addr(chk->whoTo);
10249				chk->whoTo = NULL;
10250			}
10251			goto sctp_fill_in_rest;
10252		}
10253	}
10254	/* Ok if we reach here we must build one */
10255	sctp_alloc_a_chunk(stcb, chk);
10256	if (chk == NULL) {
10257		return;
10258	}
10259	asoc->fwd_tsn_cnt++;
10260	chk->copy_by_ref = 0;
10261	chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10262	chk->rec.chunk_id.can_take_data = 0;
10263	chk->asoc = asoc;
10264	chk->whoTo = NULL;
10265	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10266	if (chk->data == NULL) {
10267		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10268		return;
10269	}
10270	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10271	chk->sent = SCTP_DATAGRAM_UNSENT;
10272	chk->snd_count = 0;
10273	TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10274	asoc->ctrl_queue_cnt++;
10275sctp_fill_in_rest:
10276	/*-
10277	 * Here we go through and fill out the part that deals with
10278	 * stream/seq of the ones we skip.
10279	 */
10280	SCTP_BUF_LEN(chk->data) = 0;
10281	{
10282		struct sctp_tmit_chunk *at, *tp1, *last;
10283		struct sctp_strseq *strseq;
10284		unsigned int cnt_of_space, i, ovh;
10285		unsigned int space_needed;
10286		unsigned int cnt_of_skipped = 0;
10287
10288		TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10289			if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10290			    (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10291				/* no more to look at */
10292				break;
10293			}
10294			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10295				/* We don't report these */
10296				continue;
10297			}
10298			cnt_of_skipped++;
10299		}
10300		space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10301		    (cnt_of_skipped * sizeof(struct sctp_strseq)));
10302
10303		cnt_of_space = M_TRAILINGSPACE(chk->data);
10304
10305		if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10306			ovh = SCTP_MIN_OVERHEAD;
10307		} else {
10308			ovh = SCTP_MIN_V4_OVERHEAD;
10309		}
10310		if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10311			/* trim to a mtu size */
10312			cnt_of_space = asoc->smallest_mtu - ovh;
10313		}
10314		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10315			sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10316			    0xff, 0, cnt_of_skipped,
10317			    asoc->advanced_peer_ack_point);
10318
10319		}
10320		advance_peer_ack_point = asoc->advanced_peer_ack_point;
10321		if (cnt_of_space < space_needed) {
10322			/*-
10323			 * ok we must trim down the chunk by lowering the
10324			 * advance peer ack point.
10325			 */
10326			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10327				sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10328				    0xff, 0xff, cnt_of_space,
10329				    space_needed);
10330			}
10331			cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10332			cnt_of_skipped /= sizeof(struct sctp_strseq);
10333			/*-
10334			 * Go through and find the TSN that will be the one
10335			 * we report.
10336			 */
10337			at = TAILQ_FIRST(&asoc->sent_queue);
10338			if (at != NULL) {
10339				for (i = 0; i < cnt_of_skipped; i++) {
10340					tp1 = TAILQ_NEXT(at, sctp_next);
10341					if (tp1 == NULL) {
10342						break;
10343					}
10344					at = tp1;
10345				}
10346			}
10347			if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10348				sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10349				    0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10350				    asoc->advanced_peer_ack_point);
10351			}
10352			last = at;
10353			/*-
10354			 * last now points to last one I can report, update
10355			 * peer ack point
10356			 */
10357			if (last)
10358				advance_peer_ack_point = last->rec.data.TSN_seq;
10359			space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10360			    cnt_of_skipped * sizeof(struct sctp_strseq);
10361		}
10362		chk->send_size = space_needed;
10363		/* Setup the chunk */
10364		fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10365		fwdtsn->ch.chunk_length = htons(chk->send_size);
10366		fwdtsn->ch.chunk_flags = 0;
10367		fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10368		fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10369		SCTP_BUF_LEN(chk->data) = chk->send_size;
10370		fwdtsn++;
10371		/*-
10372		 * Move pointer to after the fwdtsn and transfer to the
10373		 * strseq pointer.
10374		 */
10375		strseq = (struct sctp_strseq *)fwdtsn;
10376		/*-
10377		 * Now populate the strseq list. This is done blindly
10378		 * without pulling out duplicate stream info. This is
10379		 * inefficent but won't harm the process since the peer will
10380		 * look at these in sequence and will thus release anything.
10381		 * It could mean we exceed the PMTU and chop off some that
10382		 * we could have included.. but this is unlikely (aka 1432/4
10383		 * would mean 300+ stream seq's would have to be reported in
10384		 * one FWD-TSN. With a bit of work we can later FIX this to
10385		 * optimize and pull out duplcates.. but it does add more
10386		 * overhead. So for now... not!
10387		 */
10388		at = TAILQ_FIRST(&asoc->sent_queue);
10389		for (i = 0; i < cnt_of_skipped; i++) {
10390			tp1 = TAILQ_NEXT(at, sctp_next);
10391			if (tp1 == NULL)
10392				break;
10393			if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10394				/* We don't report these */
10395				i--;
10396				at = tp1;
10397				continue;
10398			}
10399			if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10400				at->rec.data.fwd_tsn_cnt = 0;
10401			}
10402			strseq->stream = ntohs(at->rec.data.stream_number);
10403			strseq->sequence = ntohs(at->rec.data.stream_seq);
10404			strseq++;
10405			at = tp1;
10406		}
10407	}
10408	return;
10409}
10410
10411void
10412sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10413#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10414    SCTP_UNUSED
10415#endif
10416)
10417{
10418	/*-
10419	 * Queue up a SACK or NR-SACK in the control queue.
10420	 * We must first check to see if a SACK or NR-SACK is
10421	 * somehow on the control queue.
10422	 * If so, we will take and and remove the old one.
10423	 */
10424	struct sctp_association *asoc;
10425	struct sctp_tmit_chunk *chk, *a_chk;
10426	struct sctp_sack_chunk *sack;
10427	struct sctp_nr_sack_chunk *nr_sack;
10428	struct sctp_gap_ack_block *gap_descriptor;
10429	struct sack_track *selector;
10430	int mergeable = 0;
10431	int offset;
10432	caddr_t limit;
10433	uint32_t *dup;
10434	int limit_reached = 0;
10435	unsigned int i, siz, j;
10436	unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10437	int num_dups = 0;
10438	int space_req;
10439	uint32_t highest_tsn;
10440	uint8_t flags;
10441	uint8_t type;
10442	uint8_t tsn_map;
10443
10444	if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10445	    (stcb->asoc.peer_supports_nr_sack == 1)) {
10446		type = SCTP_NR_SELECTIVE_ACK;
10447	} else {
10448		type = SCTP_SELECTIVE_ACK;
10449	}
10450	a_chk = NULL;
10451	asoc = &stcb->asoc;
10452	SCTP_TCB_LOCK_ASSERT(stcb);
10453	if (asoc->last_data_chunk_from == NULL) {
10454		/* Hmm we never received anything */
10455		return;
10456	}
10457	sctp_slide_mapping_arrays(stcb);
10458	sctp_set_rwnd(stcb, asoc);
10459	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10460		if (chk->rec.chunk_id.id == type) {
10461			/* Hmm, found a sack already on queue, remove it */
10462			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10463			asoc->ctrl_queue_cnt--;
10464			a_chk = chk;
10465			if (a_chk->data) {
10466				sctp_m_freem(a_chk->data);
10467				a_chk->data = NULL;
10468			}
10469			if (a_chk->whoTo) {
10470				sctp_free_remote_addr(a_chk->whoTo);
10471				a_chk->whoTo = NULL;
10472			}
10473			break;
10474		}
10475	}
10476	if (a_chk == NULL) {
10477		sctp_alloc_a_chunk(stcb, a_chk);
10478		if (a_chk == NULL) {
10479			/* No memory so we drop the idea, and set a timer */
10480			if (stcb->asoc.delayed_ack) {
10481				sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10482				    stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10483				sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10484				    stcb->sctp_ep, stcb, NULL);
10485			} else {
10486				stcb->asoc.send_sack = 1;
10487			}
10488			return;
10489		}
10490		a_chk->copy_by_ref = 0;
10491		a_chk->rec.chunk_id.id = type;
10492		a_chk->rec.chunk_id.can_take_data = 1;
10493	}
10494	/* Clear our pkt counts */
10495	asoc->data_pkts_seen = 0;
10496
10497	a_chk->asoc = asoc;
10498	a_chk->snd_count = 0;
10499	a_chk->send_size = 0;	/* fill in later */
10500	a_chk->sent = SCTP_DATAGRAM_UNSENT;
10501	a_chk->whoTo = NULL;
10502
10503	if ((asoc->numduptsns) ||
10504	    (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10505		/*-
10506		 * Ok, we have some duplicates or the destination for the
10507		 * sack is unreachable, lets see if we can select an
10508		 * alternate than asoc->last_data_chunk_from
10509		 */
10510		if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10511		    (asoc->used_alt_onsack > asoc->numnets)) {
10512			/* We used an alt last time, don't this time */
10513			a_chk->whoTo = NULL;
10514		} else {
10515			asoc->used_alt_onsack++;
10516			a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10517		}
10518		if (a_chk->whoTo == NULL) {
10519			/* Nope, no alternate */
10520			a_chk->whoTo = asoc->last_data_chunk_from;
10521			asoc->used_alt_onsack = 0;
10522		}
10523	} else {
10524		/*
10525		 * No duplicates so we use the last place we received data
10526		 * from.
10527		 */
10528		asoc->used_alt_onsack = 0;
10529		a_chk->whoTo = asoc->last_data_chunk_from;
10530	}
10531	if (a_chk->whoTo) {
10532		atomic_add_int(&a_chk->whoTo->ref_count, 1);
10533	}
10534	if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10535		highest_tsn = asoc->highest_tsn_inside_map;
10536	} else {
10537		highest_tsn = asoc->highest_tsn_inside_nr_map;
10538	}
10539	if (highest_tsn == asoc->cumulative_tsn) {
10540		/* no gaps */
10541		if (type == SCTP_SELECTIVE_ACK) {
10542			space_req = sizeof(struct sctp_sack_chunk);
10543		} else {
10544			space_req = sizeof(struct sctp_nr_sack_chunk);
10545		}
10546	} else {
10547		/* gaps get a cluster */
10548		space_req = MCLBYTES;
10549	}
10550	/* Ok now lets formulate a MBUF with our sack */
10551	a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10552	if ((a_chk->data == NULL) ||
10553	    (a_chk->whoTo == NULL)) {
10554		/* rats, no mbuf memory */
10555		if (a_chk->data) {
10556			/* was a problem with the destination */
10557			sctp_m_freem(a_chk->data);
10558			a_chk->data = NULL;
10559		}
10560		sctp_free_a_chunk(stcb, a_chk, so_locked);
10561		/* sa_ignore NO_NULL_CHK */
10562		if (stcb->asoc.delayed_ack) {
10563			sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10564			    stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10565			sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10566			    stcb->sctp_ep, stcb, NULL);
10567		} else {
10568			stcb->asoc.send_sack = 1;
10569		}
10570		return;
10571	}
10572	/* ok, lets go through and fill it in */
10573	SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10574	space = M_TRAILINGSPACE(a_chk->data);
10575	if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10576		space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10577	}
10578	limit = mtod(a_chk->data, caddr_t);
10579	limit += space;
10580
10581	flags = 0;
10582
10583	if ((asoc->sctp_cmt_on_off > 0) &&
10584	    SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10585		/*-
10586		 * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10587		 * received, then set high bit to 1, else 0. Reset
10588		 * pkts_rcvd.
10589		 */
10590		flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10591		asoc->cmt_dac_pkts_rcvd = 0;
10592	}
10593#ifdef SCTP_ASOCLOG_OF_TSNS
10594	stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10595	stcb->asoc.cumack_log_atsnt++;
10596	if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10597		stcb->asoc.cumack_log_atsnt = 0;
10598	}
10599#endif
10600	/* reset the readers interpretation */
10601	stcb->freed_by_sorcv_sincelast = 0;
10602
10603	if (type == SCTP_SELECTIVE_ACK) {
10604		sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10605		nr_sack = NULL;
10606		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10607		if (highest_tsn > asoc->mapping_array_base_tsn) {
10608			siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10609		} else {
10610			siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10611		}
10612	} else {
10613		sack = NULL;
10614		nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10615		gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10616		if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10617			siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10618		} else {
10619			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10620		}
10621	}
10622
10623	if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10624		offset = 1;
10625	} else {
10626		offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10627	}
10628	if (((type == SCTP_SELECTIVE_ACK) &&
10629	    SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10630	    ((type == SCTP_NR_SELECTIVE_ACK) &&
10631	    SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10632		/* we have a gap .. maybe */
10633		for (i = 0; i < siz; i++) {
10634			tsn_map = asoc->mapping_array[i];
10635			if (type == SCTP_SELECTIVE_ACK) {
10636				tsn_map |= asoc->nr_mapping_array[i];
10637			}
10638			if (i == 0) {
10639				/*
10640				 * Clear all bits corresponding to TSNs
10641				 * smaller or equal to the cumulative TSN.
10642				 */
10643				tsn_map &= (~0 << (1 - offset));
10644			}
10645			selector = &sack_array[tsn_map];
10646			if (mergeable && selector->right_edge) {
10647				/*
10648				 * Backup, left and right edges were ok to
10649				 * merge.
10650				 */
10651				num_gap_blocks--;
10652				gap_descriptor--;
10653			}
10654			if (selector->num_entries == 0)
10655				mergeable = 0;
10656			else {
10657				for (j = 0; j < selector->num_entries; j++) {
10658					if (mergeable && selector->right_edge) {
10659						/*
10660						 * do a merge by NOT setting
10661						 * the left side
10662						 */
10663						mergeable = 0;
10664					} else {
10665						/*
10666						 * no merge, set the left
10667						 * 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_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	if ((type == SCTP_NR_SELECTIVE_ACK) &&
10693	    (limit_reached == 0)) {
10694
10695		mergeable = 0;
10696
10697		if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10698			siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10699		} else {
10700			siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10701		}
10702
10703		if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10704			offset = 1;
10705		} else {
10706			offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10707		}
10708		if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10709			/* we have a gap .. maybe */
10710			for (i = 0; i < siz; i++) {
10711				tsn_map = asoc->nr_mapping_array[i];
10712				if (i == 0) {
10713					/*
10714					 * Clear all bits corresponding to
10715					 * TSNs smaller or equal to the
10716					 * cumulative TSN.
10717					 */
10718					tsn_map &= (~0 << (1 - offset));
10719				}
10720				selector = &sack_array[tsn_map];
10721				if (mergeable && selector->right_edge) {
10722					/*
10723					 * Backup, left and right edges were
10724					 * ok to merge.
10725					 */
10726					num_nr_gap_blocks--;
10727					gap_descriptor--;
10728				}
10729				if (selector->num_entries == 0)
10730					mergeable = 0;
10731				else {
10732					for (j = 0; j < selector->num_entries; j++) {
10733						if (mergeable && selector->right_edge) {
10734							/*
10735							 * do a merge by NOT
10736							 * setting the left
10737							 * side
10738							 */
10739							mergeable = 0;
10740						} else {
10741							/*
10742							 * no merge, set the
10743							 * left side
10744							 */
10745							mergeable = 0;
10746							gap_descriptor->start = htons((selector->gaps[j].start + offset));
10747						}
10748						gap_descriptor->end = htons((selector->gaps[j].end + offset));
10749						num_nr_gap_blocks++;
10750						gap_descriptor++;
10751						if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10752							/* no more room */
10753							limit_reached = 1;
10754							break;
10755						}
10756					}
10757					if (selector->left_edge) {
10758						mergeable = 1;
10759					}
10760				}
10761				if (limit_reached) {
10762					/* Reached the limit stop */
10763					break;
10764				}
10765				offset += 8;
10766			}
10767		}
10768	}
10769	/* now we must add any dups we are going to report. */
10770	if ((limit_reached == 0) && (asoc->numduptsns)) {
10771		dup = (uint32_t *) gap_descriptor;
10772		for (i = 0; i < asoc->numduptsns; i++) {
10773			*dup = htonl(asoc->dup_tsns[i]);
10774			dup++;
10775			num_dups++;
10776			if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10777				/* no more room */
10778				break;
10779			}
10780		}
10781		asoc->numduptsns = 0;
10782	}
10783	/*
10784	 * now that the chunk is prepared queue it to the control chunk
10785	 * queue.
10786	 */
10787	if (type == SCTP_SELECTIVE_ACK) {
10788		a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10789		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10790		    num_dups * sizeof(int32_t);
10791		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10792		sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10793		sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10794		sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10795		sack->sack.num_dup_tsns = htons(num_dups);
10796		sack->ch.chunk_type = type;
10797		sack->ch.chunk_flags = flags;
10798		sack->ch.chunk_length = htons(a_chk->send_size);
10799	} else {
10800		a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10801		    (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10802		    num_dups * sizeof(int32_t);
10803		SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10804		nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10805		nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10806		nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10807		nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10808		nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10809		nr_sack->nr_sack.reserved = 0;
10810		nr_sack->ch.chunk_type = type;
10811		nr_sack->ch.chunk_flags = flags;
10812		nr_sack->ch.chunk_length = htons(a_chk->send_size);
10813	}
10814	TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10815	asoc->my_last_reported_rwnd = asoc->my_rwnd;
10816	asoc->ctrl_queue_cnt++;
10817	asoc->send_sack = 0;
10818	SCTP_STAT_INCR(sctps_sendsacks);
10819	return;
10820}
10821
10822void
10823sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10824#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10825    SCTP_UNUSED
10826#endif
10827)
10828{
10829	struct mbuf *m_abort, *m, *m_last;
10830	struct mbuf *m_out, *m_end = NULL;
10831	struct sctp_abort_chunk *abort;
10832	struct sctp_auth_chunk *auth = NULL;
10833	struct sctp_nets *net;
10834	uint32_t vtag;
10835	uint32_t auth_offset = 0;
10836	uint16_t cause_len, chunk_len, padding_len;
10837
10838	SCTP_TCB_LOCK_ASSERT(stcb);
10839	/*-
10840	 * Add an AUTH chunk, if chunk requires it and save the offset into
10841	 * the chain for AUTH
10842	 */
10843	if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10844	    stcb->asoc.peer_auth_chunks)) {
10845		m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10846		    stcb, SCTP_ABORT_ASSOCIATION);
10847		SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10848	} else {
10849		m_out = NULL;
10850	}
10851	m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10852	if (m_abort == NULL) {
10853		if (m_out) {
10854			sctp_m_freem(m_out);
10855		}
10856		if (operr) {
10857			sctp_m_freem(operr);
10858		}
10859		return;
10860	}
10861	/* link in any error */
10862	SCTP_BUF_NEXT(m_abort) = operr;
10863	cause_len = 0;
10864	m_last = NULL;
10865	for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10866		cause_len += (uint16_t) SCTP_BUF_LEN(m);
10867		if (SCTP_BUF_NEXT(m) == NULL) {
10868			m_last = m;
10869		}
10870	}
10871	SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10872	chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10873	padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10874	if (m_out == NULL) {
10875		/* NO Auth chunk prepended, so reserve space in front */
10876		SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10877		m_out = m_abort;
10878	} else {
10879		/* Put AUTH chunk at the front of the chain */
10880		SCTP_BUF_NEXT(m_end) = m_abort;
10881	}
10882	if (stcb->asoc.alternate) {
10883		net = stcb->asoc.alternate;
10884	} else {
10885		net = stcb->asoc.primary_destination;
10886	}
10887	/* Fill in the ABORT chunk header. */
10888	abort = mtod(m_abort, struct sctp_abort_chunk *);
10889	abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10890	if (stcb->asoc.peer_vtag == 0) {
10891		/* This happens iff the assoc is in COOKIE-WAIT state. */
10892		vtag = stcb->asoc.my_vtag;
10893		abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10894	} else {
10895		vtag = stcb->asoc.peer_vtag;
10896		abort->ch.chunk_flags = 0;
10897	}
10898	abort->ch.chunk_length = htons(chunk_len);
10899	/* Add padding, if necessary. */
10900	if (padding_len > 0) {
10901		if ((m_last == NULL) || sctp_add_pad_tombuf(m_last, padding_len)) {
10902			sctp_m_freem(m_out);
10903			return;
10904		}
10905	}
10906	(void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10907	    (struct sockaddr *)&net->ro._l_addr,
10908	    m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10909	    stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10910	    stcb->asoc.primary_destination->port, NULL,
10911	    0, 0,
10912	    so_locked);
10913	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10914}
10915
10916void
10917sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10918    struct sctp_nets *net,
10919    int reflect_vtag)
10920{
10921	/* formulate and SEND a SHUTDOWN-COMPLETE */
10922	struct mbuf *m_shutdown_comp;
10923	struct sctp_shutdown_complete_chunk *shutdown_complete;
10924	uint32_t vtag;
10925	uint8_t flags;
10926
10927	m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10928	if (m_shutdown_comp == NULL) {
10929		/* no mbuf's */
10930		return;
10931	}
10932	if (reflect_vtag) {
10933		flags = SCTP_HAD_NO_TCB;
10934		vtag = stcb->asoc.my_vtag;
10935	} else {
10936		flags = 0;
10937		vtag = stcb->asoc.peer_vtag;
10938	}
10939	shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10940	shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10941	shutdown_complete->ch.chunk_flags = flags;
10942	shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10943	SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10944	(void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10945	    (struct sockaddr *)&net->ro._l_addr,
10946	    m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10947	    stcb->sctp_ep->sctp_lport, stcb->rport,
10948	    htonl(vtag),
10949	    net->port, NULL,
10950	    0, 0,
10951	    SCTP_SO_NOT_LOCKED);
10952	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10953	return;
10954}
10955
10956static void
10957sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10958    struct sctphdr *sh, uint32_t vtag,
10959    uint8_t type, struct mbuf *cause,
10960    uint8_t use_mflowid, uint32_t mflowid,
10961    uint32_t vrf_id, uint16_t port)
10962{
10963	struct mbuf *o_pak;
10964	struct mbuf *mout;
10965	struct sctphdr *shout;
10966	struct sctp_chunkhdr *ch;
10967	struct udphdr *udp;
10968	int len, cause_len, padding_len;
10969
10970#if defined(INET) || defined(INET6)
10971	int ret;
10972
10973#endif
10974#ifdef INET
10975	struct sockaddr_in *src_sin, *dst_sin;
10976	struct ip *ip;
10977
10978#endif
10979#ifdef INET6
10980	struct sockaddr_in6 *src_sin6, *dst_sin6;
10981	struct ip6_hdr *ip6;
10982
10983#endif
10984
10985	/* Compute the length of the cause and add final padding. */
10986	cause_len = 0;
10987	if (cause != NULL) {
10988		struct mbuf *m_at, *m_last = NULL;
10989
10990		for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10991			if (SCTP_BUF_NEXT(m_at) == NULL)
10992				m_last = m_at;
10993			cause_len += SCTP_BUF_LEN(m_at);
10994		}
10995		padding_len = cause_len % 4;
10996		if (padding_len != 0) {
10997			padding_len = 4 - padding_len;
10998		}
10999		if (padding_len != 0) {
11000			if (sctp_add_pad_tombuf(m_last, padding_len)) {
11001				sctp_m_freem(cause);
11002				return;
11003			}
11004		}
11005	} else {
11006		padding_len = 0;
11007	}
11008	/* Get an mbuf for the header. */
11009	len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11010	switch (dst->sa_family) {
11011#ifdef INET
11012	case AF_INET:
11013		len += sizeof(struct ip);
11014		break;
11015#endif
11016#ifdef INET6
11017	case AF_INET6:
11018		len += sizeof(struct ip6_hdr);
11019		break;
11020#endif
11021	default:
11022		break;
11023	}
11024	if (port) {
11025		len += sizeof(struct udphdr);
11026	}
11027	mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11028	if (mout == NULL) {
11029		if (cause) {
11030			sctp_m_freem(cause);
11031		}
11032		return;
11033	}
11034	SCTP_BUF_RESV_UF(mout, max_linkhdr);
11035	SCTP_BUF_LEN(mout) = len;
11036	SCTP_BUF_NEXT(mout) = cause;
11037	if (use_mflowid != 0) {
11038		mout->m_pkthdr.flowid = mflowid;
11039		mout->m_flags |= M_FLOWID;
11040	}
11041#ifdef INET
11042	ip = NULL;
11043#endif
11044#ifdef INET6
11045	ip6 = NULL;
11046#endif
11047	switch (dst->sa_family) {
11048#ifdef INET
11049	case AF_INET:
11050		src_sin = (struct sockaddr_in *)src;
11051		dst_sin = (struct sockaddr_in *)dst;
11052		ip = mtod(mout, struct ip *);
11053		ip->ip_v = IPVERSION;
11054		ip->ip_hl = (sizeof(struct ip) >> 2);
11055		ip->ip_tos = 0;
11056		ip->ip_id = ip_newid();
11057		ip->ip_off = 0;
11058		ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11059		if (port) {
11060			ip->ip_p = IPPROTO_UDP;
11061		} else {
11062			ip->ip_p = IPPROTO_SCTP;
11063		}
11064		ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11065		ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11066		ip->ip_sum = 0;
11067		len = sizeof(struct ip);
11068		shout = (struct sctphdr *)((caddr_t)ip + len);
11069		break;
11070#endif
11071#ifdef INET6
11072	case AF_INET6:
11073		src_sin6 = (struct sockaddr_in6 *)src;
11074		dst_sin6 = (struct sockaddr_in6 *)dst;
11075		ip6 = mtod(mout, struct ip6_hdr *);
11076		ip6->ip6_flow = htonl(0x60000000);
11077		if (V_ip6_auto_flowlabel) {
11078			ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11079		}
11080		ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11081		if (port) {
11082			ip6->ip6_nxt = IPPROTO_UDP;
11083		} else {
11084			ip6->ip6_nxt = IPPROTO_SCTP;
11085		}
11086		ip6->ip6_src = dst_sin6->sin6_addr;
11087		ip6->ip6_dst = src_sin6->sin6_addr;
11088		len = sizeof(struct ip6_hdr);
11089		shout = (struct sctphdr *)((caddr_t)ip6 + len);
11090		break;
11091#endif
11092	default:
11093		len = 0;
11094		shout = mtod(mout, struct sctphdr *);
11095		break;
11096	}
11097	if (port) {
11098		if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11099			sctp_m_freem(mout);
11100			return;
11101		}
11102		udp = (struct udphdr *)shout;
11103		udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11104		udp->uh_dport = port;
11105		udp->uh_sum = 0;
11106		udp->uh_ulen = htons(sizeof(struct udphdr) +
11107		    sizeof(struct sctphdr) +
11108		    sizeof(struct sctp_chunkhdr) +
11109		    cause_len + padding_len);
11110		len += sizeof(struct udphdr);
11111		shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11112	} else {
11113		udp = NULL;
11114	}
11115	shout->src_port = sh->dest_port;
11116	shout->dest_port = sh->src_port;
11117	shout->checksum = 0;
11118	if (vtag) {
11119		shout->v_tag = htonl(vtag);
11120	} else {
11121		shout->v_tag = sh->v_tag;
11122	}
11123	len += sizeof(struct sctphdr);
11124	ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11125	ch->chunk_type = type;
11126	if (vtag) {
11127		ch->chunk_flags = 0;
11128	} else {
11129		ch->chunk_flags = SCTP_HAD_NO_TCB;
11130	}
11131	ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11132	len += sizeof(struct sctp_chunkhdr);
11133	len += cause_len + padding_len;
11134
11135	if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11136		sctp_m_freem(mout);
11137		return;
11138	}
11139	SCTP_ATTACH_CHAIN(o_pak, mout, len);
11140	switch (dst->sa_family) {
11141#ifdef INET
11142	case AF_INET:
11143		if (port) {
11144			if (V_udp_cksum) {
11145				udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11146			} else {
11147				udp->uh_sum = 0;
11148			}
11149		}
11150		ip->ip_len = len;
11151		if (port) {
11152#if defined(SCTP_WITH_NO_CSUM)
11153			SCTP_STAT_INCR(sctps_sendnocrc);
11154#else
11155			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11156			SCTP_STAT_INCR(sctps_sendswcrc);
11157#endif
11158			if (V_udp_cksum) {
11159				SCTP_ENABLE_UDP_CSUM(o_pak);
11160			}
11161		} else {
11162#if defined(SCTP_WITH_NO_CSUM)
11163			SCTP_STAT_INCR(sctps_sendnocrc);
11164#else
11165			mout->m_pkthdr.csum_flags = CSUM_SCTP;
11166			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11167			SCTP_STAT_INCR(sctps_sendhwcrc);
11168#endif
11169		}
11170#ifdef SCTP_PACKET_LOGGING
11171		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11172			sctp_packet_log(o_pak);
11173		}
11174#endif
11175		SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11176		break;
11177#endif
11178#ifdef INET6
11179	case AF_INET6:
11180		ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11181		if (port) {
11182#if defined(SCTP_WITH_NO_CSUM)
11183			SCTP_STAT_INCR(sctps_sendnocrc);
11184#else
11185			shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11186			SCTP_STAT_INCR(sctps_sendswcrc);
11187#endif
11188			if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11189				udp->uh_sum = 0xffff;
11190			}
11191		} else {
11192#if defined(SCTP_WITH_NO_CSUM)
11193			SCTP_STAT_INCR(sctps_sendnocrc);
11194#else
11195			mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11196			mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11197			SCTP_STAT_INCR(sctps_sendhwcrc);
11198#endif
11199		}
11200#ifdef SCTP_PACKET_LOGGING
11201		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11202			sctp_packet_log(o_pak);
11203		}
11204#endif
11205		SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11206		break;
11207#endif
11208	default:
11209		SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11210		    dst->sa_family);
11211		sctp_m_freem(mout);
11212		SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11213		return;
11214	}
11215	SCTP_STAT_INCR(sctps_sendpackets);
11216	SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11217	SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11218	return;
11219}
11220
11221void
11222sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11223    struct sctphdr *sh,
11224    uint8_t use_mflowid, uint32_t mflowid,
11225    uint32_t vrf_id, uint16_t port)
11226{
11227	sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11228	    use_mflowid, mflowid,
11229	    vrf_id, port);
11230}
11231
11232void
11233sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11234#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11235    SCTP_UNUSED
11236#endif
11237)
11238{
11239	struct sctp_tmit_chunk *chk;
11240	struct sctp_heartbeat_chunk *hb;
11241	struct timeval now;
11242
11243	SCTP_TCB_LOCK_ASSERT(stcb);
11244	if (net == NULL) {
11245		return;
11246	}
11247	(void)SCTP_GETTIME_TIMEVAL(&now);
11248	switch (net->ro._l_addr.sa.sa_family) {
11249#ifdef INET
11250	case AF_INET:
11251		break;
11252#endif
11253#ifdef INET6
11254	case AF_INET6:
11255		break;
11256#endif
11257	default:
11258		return;
11259	}
11260	sctp_alloc_a_chunk(stcb, chk);
11261	if (chk == NULL) {
11262		SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11263		return;
11264	}
11265	chk->copy_by_ref = 0;
11266	chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11267	chk->rec.chunk_id.can_take_data = 1;
11268	chk->asoc = &stcb->asoc;
11269	chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11270
11271	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11272	if (chk->data == NULL) {
11273		sctp_free_a_chunk(stcb, chk, so_locked);
11274		return;
11275	}
11276	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11277	SCTP_BUF_LEN(chk->data) = chk->send_size;
11278	chk->sent = SCTP_DATAGRAM_UNSENT;
11279	chk->snd_count = 0;
11280	chk->whoTo = net;
11281	atomic_add_int(&chk->whoTo->ref_count, 1);
11282	/* Now we have a mbuf that we can fill in with the details */
11283	hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11284	memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11285	/* fill out chunk header */
11286	hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11287	hb->ch.chunk_flags = 0;
11288	hb->ch.chunk_length = htons(chk->send_size);
11289	/* Fill out hb parameter */
11290	hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11291	hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11292	hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11293	hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11294	/* Did our user request this one, put it in */
11295	hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11296	hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11297	if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11298		/*
11299		 * we only take from the entropy pool if the address is not
11300		 * confirmed.
11301		 */
11302		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11303		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11304	} else {
11305		net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11306		net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11307	}
11308	switch (net->ro._l_addr.sa.sa_family) {
11309#ifdef INET
11310	case AF_INET:
11311		memcpy(hb->heartbeat.hb_info.address,
11312		    &net->ro._l_addr.sin.sin_addr,
11313		    sizeof(net->ro._l_addr.sin.sin_addr));
11314		break;
11315#endif
11316#ifdef INET6
11317	case AF_INET6:
11318		memcpy(hb->heartbeat.hb_info.address,
11319		    &net->ro._l_addr.sin6.sin6_addr,
11320		    sizeof(net->ro._l_addr.sin6.sin6_addr));
11321		break;
11322#endif
11323	default:
11324		return;
11325		break;
11326	}
11327	net->hb_responded = 0;
11328	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11329	stcb->asoc.ctrl_queue_cnt++;
11330	SCTP_STAT_INCR(sctps_sendheartbeat);
11331	return;
11332}
11333
11334void
11335sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11336    uint32_t high_tsn)
11337{
11338	struct sctp_association *asoc;
11339	struct sctp_ecne_chunk *ecne;
11340	struct sctp_tmit_chunk *chk;
11341
11342	if (net == NULL) {
11343		return;
11344	}
11345	asoc = &stcb->asoc;
11346	SCTP_TCB_LOCK_ASSERT(stcb);
11347	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11348		if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11349			/* found a previous ECN_ECHO update it if needed */
11350			uint32_t cnt, ctsn;
11351
11352			ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11353			ctsn = ntohl(ecne->tsn);
11354			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11355				ecne->tsn = htonl(high_tsn);
11356				SCTP_STAT_INCR(sctps_queue_upd_ecne);
11357			}
11358			cnt = ntohl(ecne->num_pkts_since_cwr);
11359			cnt++;
11360			ecne->num_pkts_since_cwr = htonl(cnt);
11361			return;
11362		}
11363	}
11364	/* nope could not find one to update so we must build one */
11365	sctp_alloc_a_chunk(stcb, chk);
11366	if (chk == NULL) {
11367		return;
11368	}
11369	chk->copy_by_ref = 0;
11370	SCTP_STAT_INCR(sctps_queue_upd_ecne);
11371	chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11372	chk->rec.chunk_id.can_take_data = 0;
11373	chk->asoc = &stcb->asoc;
11374	chk->send_size = sizeof(struct sctp_ecne_chunk);
11375	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11376	if (chk->data == NULL) {
11377		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11378		return;
11379	}
11380	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11381	SCTP_BUF_LEN(chk->data) = chk->send_size;
11382	chk->sent = SCTP_DATAGRAM_UNSENT;
11383	chk->snd_count = 0;
11384	chk->whoTo = net;
11385	atomic_add_int(&chk->whoTo->ref_count, 1);
11386
11387	stcb->asoc.ecn_echo_cnt_onq++;
11388	ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11389	ecne->ch.chunk_type = SCTP_ECN_ECHO;
11390	ecne->ch.chunk_flags = 0;
11391	ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11392	ecne->tsn = htonl(high_tsn);
11393	ecne->num_pkts_since_cwr = htonl(1);
11394	TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11395	asoc->ctrl_queue_cnt++;
11396}
11397
11398void
11399sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11400    struct mbuf *m, int len, int iphlen, int bad_crc)
11401{
11402	struct sctp_association *asoc;
11403	struct sctp_pktdrop_chunk *drp;
11404	struct sctp_tmit_chunk *chk;
11405	uint8_t *datap;
11406	int was_trunc = 0;
11407	int fullsz = 0;
11408	long spc;
11409	int offset;
11410	struct sctp_chunkhdr *ch, chunk_buf;
11411	unsigned int chk_length;
11412
11413	if (!stcb) {
11414		return;
11415	}
11416	asoc = &stcb->asoc;
11417	SCTP_TCB_LOCK_ASSERT(stcb);
11418	if (asoc->peer_supports_pktdrop == 0) {
11419		/*-
11420		 * peer must declare support before I send one.
11421		 */
11422		return;
11423	}
11424	if (stcb->sctp_socket == NULL) {
11425		return;
11426	}
11427	sctp_alloc_a_chunk(stcb, chk);
11428	if (chk == NULL) {
11429		return;
11430	}
11431	chk->copy_by_ref = 0;
11432	len -= iphlen;
11433	chk->send_size = len;
11434	/* Validate that we do not have an ABORT in here. */
11435	offset = iphlen + sizeof(struct sctphdr);
11436	ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11437	    sizeof(*ch), (uint8_t *) & chunk_buf);
11438	while (ch != NULL) {
11439		chk_length = ntohs(ch->chunk_length);
11440		if (chk_length < sizeof(*ch)) {
11441			/* break to abort land */
11442			break;
11443		}
11444		switch (ch->chunk_type) {
11445		case SCTP_PACKET_DROPPED:
11446		case SCTP_ABORT_ASSOCIATION:
11447		case SCTP_INITIATION_ACK:
11448			/**
11449			 * We don't respond with an PKT-DROP to an ABORT
11450			 * or PKT-DROP. We also do not respond to an
11451			 * INIT-ACK, because we can't know if the initiation
11452			 * tag is correct or not.
11453			 */
11454			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11455			return;
11456		default:
11457			break;
11458		}
11459		offset += SCTP_SIZE32(chk_length);
11460		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11461		    sizeof(*ch), (uint8_t *) & chunk_buf);
11462	}
11463
11464	if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11465	    min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11466		/*
11467		 * only send 1 mtu worth, trim off the excess on the end.
11468		 */
11469		fullsz = len;
11470		len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11471		was_trunc = 1;
11472	}
11473	chk->asoc = &stcb->asoc;
11474	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11475	if (chk->data == NULL) {
11476jump_out:
11477		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11478		return;
11479	}
11480	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11481	drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11482	if (drp == NULL) {
11483		sctp_m_freem(chk->data);
11484		chk->data = NULL;
11485		goto jump_out;
11486	}
11487	chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11488	    sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11489	chk->book_size_scale = 0;
11490	if (was_trunc) {
11491		drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11492		drp->trunc_len = htons(fullsz);
11493		/*
11494		 * Len is already adjusted to size minus overhead above take
11495		 * out the pkt_drop chunk itself from it.
11496		 */
11497		chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11498		len = chk->send_size;
11499	} else {
11500		/* no truncation needed */
11501		drp->ch.chunk_flags = 0;
11502		drp->trunc_len = htons(0);
11503	}
11504	if (bad_crc) {
11505		drp->ch.chunk_flags |= SCTP_BADCRC;
11506	}
11507	chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11508	SCTP_BUF_LEN(chk->data) = chk->send_size;
11509	chk->sent = SCTP_DATAGRAM_UNSENT;
11510	chk->snd_count = 0;
11511	if (net) {
11512		/* we should hit here */
11513		chk->whoTo = net;
11514		atomic_add_int(&chk->whoTo->ref_count, 1);
11515	} else {
11516		chk->whoTo = NULL;
11517	}
11518	chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11519	chk->rec.chunk_id.can_take_data = 1;
11520	drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11521	drp->ch.chunk_length = htons(chk->send_size);
11522	spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11523	if (spc < 0) {
11524		spc = 0;
11525	}
11526	drp->bottle_bw = htonl(spc);
11527	if (asoc->my_rwnd) {
11528		drp->current_onq = htonl(asoc->size_on_reasm_queue +
11529		    asoc->size_on_all_streams +
11530		    asoc->my_rwnd_control_len +
11531		    stcb->sctp_socket->so_rcv.sb_cc);
11532	} else {
11533		/*-
11534		 * If my rwnd is 0, possibly from mbuf depletion as well as
11535		 * space used, tell the peer there is NO space aka onq == bw
11536		 */
11537		drp->current_onq = htonl(spc);
11538	}
11539	drp->reserved = 0;
11540	datap = drp->data;
11541	m_copydata(m, iphlen, len, (caddr_t)datap);
11542	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11543	asoc->ctrl_queue_cnt++;
11544}
11545
11546void
11547sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11548{
11549	struct sctp_association *asoc;
11550	struct sctp_cwr_chunk *cwr;
11551	struct sctp_tmit_chunk *chk;
11552
11553	SCTP_TCB_LOCK_ASSERT(stcb);
11554	if (net == NULL) {
11555		return;
11556	}
11557	asoc = &stcb->asoc;
11558	TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11559		if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11560			/*
11561			 * found a previous CWR queued to same destination
11562			 * update it if needed
11563			 */
11564			uint32_t ctsn;
11565
11566			cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11567			ctsn = ntohl(cwr->tsn);
11568			if (SCTP_TSN_GT(high_tsn, ctsn)) {
11569				cwr->tsn = htonl(high_tsn);
11570			}
11571			if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11572				/* Make sure override is carried */
11573				cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11574			}
11575			return;
11576		}
11577	}
11578	sctp_alloc_a_chunk(stcb, chk);
11579	if (chk == NULL) {
11580		return;
11581	}
11582	chk->copy_by_ref = 0;
11583	chk->rec.chunk_id.id = SCTP_ECN_CWR;
11584	chk->rec.chunk_id.can_take_data = 1;
11585	chk->asoc = &stcb->asoc;
11586	chk->send_size = sizeof(struct sctp_cwr_chunk);
11587	chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11588	if (chk->data == NULL) {
11589		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11590		return;
11591	}
11592	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11593	SCTP_BUF_LEN(chk->data) = chk->send_size;
11594	chk->sent = SCTP_DATAGRAM_UNSENT;
11595	chk->snd_count = 0;
11596	chk->whoTo = net;
11597	atomic_add_int(&chk->whoTo->ref_count, 1);
11598	cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11599	cwr->ch.chunk_type = SCTP_ECN_CWR;
11600	cwr->ch.chunk_flags = override;
11601	cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11602	cwr->tsn = htonl(high_tsn);
11603	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11604	asoc->ctrl_queue_cnt++;
11605}
11606
11607void
11608sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11609    int number_entries, uint16_t * list,
11610    uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11611{
11612	uint16_t len, old_len, i;
11613	struct sctp_stream_reset_out_request *req_out;
11614	struct sctp_chunkhdr *ch;
11615
11616	ch = mtod(chk->data, struct sctp_chunkhdr *);
11617	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11618
11619	/* get to new offset for the param. */
11620	req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11621	/* now how long will this param be? */
11622	len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11623	req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11624	req_out->ph.param_length = htons(len);
11625	req_out->request_seq = htonl(seq);
11626	req_out->response_seq = htonl(resp_seq);
11627	req_out->send_reset_at_tsn = htonl(last_sent);
11628	if (number_entries) {
11629		for (i = 0; i < number_entries; i++) {
11630			req_out->list_of_streams[i] = htons(list[i]);
11631		}
11632	}
11633	if (SCTP_SIZE32(len) > len) {
11634		/*-
11635		 * Need to worry about the pad we may end up adding to the
11636		 * end. This is easy since the struct is either aligned to 4
11637		 * bytes or 2 bytes off.
11638		 */
11639		req_out->list_of_streams[number_entries] = 0;
11640	}
11641	/* now fix the chunk length */
11642	ch->chunk_length = htons(len + old_len);
11643	chk->book_size = len + old_len;
11644	chk->book_size_scale = 0;
11645	chk->send_size = SCTP_SIZE32(chk->book_size);
11646	SCTP_BUF_LEN(chk->data) = chk->send_size;
11647	return;
11648}
11649
11650static void
11651sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11652    int number_entries, uint16_t * list,
11653    uint32_t seq)
11654{
11655	uint16_t len, old_len, i;
11656	struct sctp_stream_reset_in_request *req_in;
11657	struct sctp_chunkhdr *ch;
11658
11659	ch = mtod(chk->data, struct sctp_chunkhdr *);
11660	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11661
11662	/* get to new offset for the param. */
11663	req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11664	/* now how long will this param be? */
11665	len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11666	req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11667	req_in->ph.param_length = htons(len);
11668	req_in->request_seq = htonl(seq);
11669	if (number_entries) {
11670		for (i = 0; i < number_entries; i++) {
11671			req_in->list_of_streams[i] = htons(list[i]);
11672		}
11673	}
11674	if (SCTP_SIZE32(len) > len) {
11675		/*-
11676		 * Need to worry about the pad we may end up adding to the
11677		 * end. This is easy since the struct is either aligned to 4
11678		 * bytes or 2 bytes off.
11679		 */
11680		req_in->list_of_streams[number_entries] = 0;
11681	}
11682	/* now fix the chunk length */
11683	ch->chunk_length = htons(len + old_len);
11684	chk->book_size = len + old_len;
11685	chk->book_size_scale = 0;
11686	chk->send_size = SCTP_SIZE32(chk->book_size);
11687	SCTP_BUF_LEN(chk->data) = chk->send_size;
11688	return;
11689}
11690
11691static void
11692sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11693    uint32_t seq)
11694{
11695	uint16_t len, old_len;
11696	struct sctp_stream_reset_tsn_request *req_tsn;
11697	struct sctp_chunkhdr *ch;
11698
11699	ch = mtod(chk->data, struct sctp_chunkhdr *);
11700	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11701
11702	/* get to new offset for the param. */
11703	req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11704	/* now how long will this param be? */
11705	len = sizeof(struct sctp_stream_reset_tsn_request);
11706	req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11707	req_tsn->ph.param_length = htons(len);
11708	req_tsn->request_seq = htonl(seq);
11709
11710	/* now fix the chunk length */
11711	ch->chunk_length = htons(len + old_len);
11712	chk->send_size = len + old_len;
11713	chk->book_size = SCTP_SIZE32(chk->send_size);
11714	chk->book_size_scale = 0;
11715	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11716	return;
11717}
11718
11719void
11720sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11721    uint32_t resp_seq, uint32_t result)
11722{
11723	uint16_t len, old_len;
11724	struct sctp_stream_reset_response *resp;
11725	struct sctp_chunkhdr *ch;
11726
11727	ch = mtod(chk->data, struct sctp_chunkhdr *);
11728	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11729
11730	/* get to new offset for the param. */
11731	resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11732	/* now how long will this param be? */
11733	len = sizeof(struct sctp_stream_reset_response);
11734	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11735	resp->ph.param_length = htons(len);
11736	resp->response_seq = htonl(resp_seq);
11737	resp->result = ntohl(result);
11738
11739	/* now fix the chunk length */
11740	ch->chunk_length = htons(len + old_len);
11741	chk->book_size = len + old_len;
11742	chk->book_size_scale = 0;
11743	chk->send_size = SCTP_SIZE32(chk->book_size);
11744	SCTP_BUF_LEN(chk->data) = chk->send_size;
11745	return;
11746}
11747
11748void
11749sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11750    uint32_t resp_seq, uint32_t result,
11751    uint32_t send_una, uint32_t recv_next)
11752{
11753	uint16_t len, old_len;
11754	struct sctp_stream_reset_response_tsn *resp;
11755	struct sctp_chunkhdr *ch;
11756
11757	ch = mtod(chk->data, struct sctp_chunkhdr *);
11758	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11759
11760	/* get to new offset for the param. */
11761	resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11762	/* now how long will this param be? */
11763	len = sizeof(struct sctp_stream_reset_response_tsn);
11764	resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11765	resp->ph.param_length = htons(len);
11766	resp->response_seq = htonl(resp_seq);
11767	resp->result = htonl(result);
11768	resp->senders_next_tsn = htonl(send_una);
11769	resp->receivers_next_tsn = htonl(recv_next);
11770
11771	/* now fix the chunk length */
11772	ch->chunk_length = htons(len + old_len);
11773	chk->book_size = len + old_len;
11774	chk->send_size = SCTP_SIZE32(chk->book_size);
11775	chk->book_size_scale = 0;
11776	SCTP_BUF_LEN(chk->data) = chk->send_size;
11777	return;
11778}
11779
11780static void
11781sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11782    uint32_t seq,
11783    uint16_t adding)
11784{
11785	uint16_t len, old_len;
11786	struct sctp_chunkhdr *ch;
11787	struct sctp_stream_reset_add_strm *addstr;
11788
11789	ch = mtod(chk->data, struct sctp_chunkhdr *);
11790	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11791
11792	/* get to new offset for the param. */
11793	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11794	/* now how long will this param be? */
11795	len = sizeof(struct sctp_stream_reset_add_strm);
11796
11797	/* Fill it out. */
11798	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11799	addstr->ph.param_length = htons(len);
11800	addstr->request_seq = htonl(seq);
11801	addstr->number_of_streams = htons(adding);
11802	addstr->reserved = 0;
11803
11804	/* now fix the chunk length */
11805	ch->chunk_length = htons(len + old_len);
11806	chk->send_size = len + old_len;
11807	chk->book_size = SCTP_SIZE32(chk->send_size);
11808	chk->book_size_scale = 0;
11809	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11810	return;
11811}
11812
11813static void
11814sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11815    uint32_t seq,
11816    uint16_t adding)
11817{
11818	uint16_t len, old_len;
11819	struct sctp_chunkhdr *ch;
11820	struct sctp_stream_reset_add_strm *addstr;
11821
11822	ch = mtod(chk->data, struct sctp_chunkhdr *);
11823	old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11824
11825	/* get to new offset for the param. */
11826	addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11827	/* now how long will this param be? */
11828	len = sizeof(struct sctp_stream_reset_add_strm);
11829	/* Fill it out. */
11830	addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11831	addstr->ph.param_length = htons(len);
11832	addstr->request_seq = htonl(seq);
11833	addstr->number_of_streams = htons(adding);
11834	addstr->reserved = 0;
11835
11836	/* now fix the chunk length */
11837	ch->chunk_length = htons(len + old_len);
11838	chk->send_size = len + old_len;
11839	chk->book_size = SCTP_SIZE32(chk->send_size);
11840	chk->book_size_scale = 0;
11841	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11842	return;
11843}
11844
11845int
11846sctp_send_str_reset_req(struct sctp_tcb *stcb,
11847    int number_entries, uint16_t * list,
11848    uint8_t send_out_req,
11849    uint8_t send_in_req,
11850    uint8_t send_tsn_req,
11851    uint8_t add_stream,
11852    uint16_t adding_o,
11853    uint16_t adding_i, uint8_t peer_asked)
11854{
11855
11856	struct sctp_association *asoc;
11857	struct sctp_tmit_chunk *chk;
11858	struct sctp_chunkhdr *ch;
11859	uint32_t seq;
11860
11861	asoc = &stcb->asoc;
11862	if (asoc->stream_reset_outstanding) {
11863		/*-
11864		 * Already one pending, must get ACK back to clear the flag.
11865		 */
11866		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11867		return (EBUSY);
11868	}
11869	if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11870	    (add_stream == 0)) {
11871		/* nothing to do */
11872		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11873		return (EINVAL);
11874	}
11875	if (send_tsn_req && (send_out_req || send_in_req)) {
11876		/* error, can't do that */
11877		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11878		return (EINVAL);
11879	}
11880	sctp_alloc_a_chunk(stcb, chk);
11881	if (chk == NULL) {
11882		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11883		return (ENOMEM);
11884	}
11885	chk->copy_by_ref = 0;
11886	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11887	chk->rec.chunk_id.can_take_data = 0;
11888	chk->asoc = &stcb->asoc;
11889	chk->book_size = sizeof(struct sctp_chunkhdr);
11890	chk->send_size = SCTP_SIZE32(chk->book_size);
11891	chk->book_size_scale = 0;
11892
11893	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11894	if (chk->data == NULL) {
11895		sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11896		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11897		return (ENOMEM);
11898	}
11899	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11900
11901	/* setup chunk parameters */
11902	chk->sent = SCTP_DATAGRAM_UNSENT;
11903	chk->snd_count = 0;
11904	if (stcb->asoc.alternate) {
11905		chk->whoTo = stcb->asoc.alternate;
11906	} else {
11907		chk->whoTo = stcb->asoc.primary_destination;
11908	}
11909	atomic_add_int(&chk->whoTo->ref_count, 1);
11910	ch = mtod(chk->data, struct sctp_chunkhdr *);
11911	ch->chunk_type = SCTP_STREAM_RESET;
11912	ch->chunk_flags = 0;
11913	ch->chunk_length = htons(chk->book_size);
11914	SCTP_BUF_LEN(chk->data) = chk->send_size;
11915
11916	seq = stcb->asoc.str_reset_seq_out;
11917	if (send_out_req) {
11918		sctp_add_stream_reset_out(chk, number_entries, list,
11919		    seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11920		asoc->stream_reset_out_is_outstanding = 1;
11921		seq++;
11922		asoc->stream_reset_outstanding++;
11923	}
11924	if ((add_stream & 1) &&
11925	    ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11926		/* Need to allocate more */
11927		struct sctp_stream_out *oldstream;
11928		struct sctp_stream_queue_pending *sp, *nsp;
11929		int i;
11930
11931		oldstream = stcb->asoc.strmout;
11932		/* get some more */
11933		SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11934		    ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11935		    SCTP_M_STRMO);
11936		if (stcb->asoc.strmout == NULL) {
11937			uint8_t x;
11938
11939			stcb->asoc.strmout = oldstream;
11940			/* Turn off the bit */
11941			x = add_stream & 0xfe;
11942			add_stream = x;
11943			goto skip_stuff;
11944		}
11945		/*
11946		 * Ok now we proceed with copying the old out stuff and
11947		 * initializing the new stuff.
11948		 */
11949		SCTP_TCB_SEND_LOCK(stcb);
11950		stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11951		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11952			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11953			stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
11954			stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
11955			stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11956			stcb->asoc.strmout[i].stream_no = i;
11957			stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11958			/* now anything on those queues? */
11959			TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11960				TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11961				TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11962			}
11963			/* Now move assoc pointers too */
11964			if (stcb->asoc.last_out_stream == &oldstream[i]) {
11965				stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11966			}
11967			if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11968				stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11969			}
11970		}
11971		/* now the new streams */
11972		stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11973		for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11974			TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11975			stcb->asoc.strmout[i].chunks_on_queues = 0;
11976			stcb->asoc.strmout[i].next_sequence_send = 0x0;
11977			stcb->asoc.strmout[i].stream_no = i;
11978			stcb->asoc.strmout[i].last_msg_incomplete = 0;
11979			stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11980		}
11981		stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11982		SCTP_FREE(oldstream, SCTP_M_STRMO);
11983		SCTP_TCB_SEND_UNLOCK(stcb);
11984	}
11985skip_stuff:
11986	if ((add_stream & 1) && (adding_o > 0)) {
11987		asoc->strm_pending_add_size = adding_o;
11988		asoc->peer_req_out = peer_asked;
11989		sctp_add_an_out_stream(chk, seq, adding_o);
11990		seq++;
11991		asoc->stream_reset_outstanding++;
11992	}
11993	if ((add_stream & 2) && (adding_i > 0)) {
11994		sctp_add_an_in_stream(chk, seq, adding_i);
11995		seq++;
11996		asoc->stream_reset_outstanding++;
11997	}
11998	if (send_in_req) {
11999		sctp_add_stream_reset_in(chk, number_entries, list, seq);
12000		seq++;
12001		asoc->stream_reset_outstanding++;
12002	}
12003	if (send_tsn_req) {
12004		sctp_add_stream_reset_tsn(chk, seq);
12005		asoc->stream_reset_outstanding++;
12006	}
12007	asoc->str_reset = chk;
12008	/* insert the chunk for sending */
12009	TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12010	    chk,
12011	    sctp_next);
12012	asoc->ctrl_queue_cnt++;
12013	sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12014	return (0);
12015}
12016
12017void
12018sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12019    struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12020    uint8_t use_mflowid, uint32_t mflowid,
12021    uint32_t vrf_id, uint16_t port)
12022{
12023	/* Don't respond to an ABORT with an ABORT. */
12024	if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12025		if (cause)
12026			sctp_m_freem(cause);
12027		return;
12028	}
12029	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12030	    use_mflowid, mflowid,
12031	    vrf_id, port);
12032	return;
12033}
12034
12035void
12036sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12037    struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12038    uint8_t use_mflowid, uint32_t mflowid,
12039    uint32_t vrf_id, uint16_t port)
12040{
12041	sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12042	    use_mflowid, mflowid,
12043	    vrf_id, port);
12044	return;
12045}
12046
12047static struct mbuf *
12048sctp_copy_resume(struct uio *uio,
12049    int max_send_len,
12050    int user_marks_eor,
12051    int *error,
12052    uint32_t * sndout,
12053    struct mbuf **new_tail)
12054{
12055	struct mbuf *m;
12056
12057	m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12058	    (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12059	if (m == NULL) {
12060		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12061		*error = ENOMEM;
12062	} else {
12063		*sndout = m_length(m, NULL);
12064		*new_tail = m_last(m);
12065	}
12066	return (m);
12067}
12068
12069static int
12070sctp_copy_one(struct sctp_stream_queue_pending *sp,
12071    struct uio *uio,
12072    int resv_upfront)
12073{
12074	int left;
12075
12076	left = sp->length;
12077	sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12078	    resv_upfront, 0);
12079	if (sp->data == NULL) {
12080		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12081		return (ENOMEM);
12082	}
12083	sp->tail_mbuf = m_last(sp->data);
12084	return (0);
12085}
12086
12087
12088
12089static struct sctp_stream_queue_pending *
12090sctp_copy_it_in(struct sctp_tcb *stcb,
12091    struct sctp_association *asoc,
12092    struct sctp_sndrcvinfo *srcv,
12093    struct uio *uio,
12094    struct sctp_nets *net,
12095    int max_send_len,
12096    int user_marks_eor,
12097    int *error)
12098{
12099	/*-
12100	 * This routine must be very careful in its work. Protocol
12101	 * processing is up and running so care must be taken to spl...()
12102	 * when you need to do something that may effect the stcb/asoc. The
12103	 * sb is locked however. When data is copied the protocol processing
12104	 * should be enabled since this is a slower operation...
12105	 */
12106	struct sctp_stream_queue_pending *sp = NULL;
12107	int resv_in_first;
12108
12109	*error = 0;
12110	/* Now can we send this? */
12111	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12112	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12113	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12114	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12115		/* got data while shutting down */
12116		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12117		*error = ECONNRESET;
12118		goto out_now;
12119	}
12120	sctp_alloc_a_strmoq(stcb, sp);
12121	if (sp == NULL) {
12122		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12123		*error = ENOMEM;
12124		goto out_now;
12125	}
12126	sp->act_flags = 0;
12127	sp->sender_all_done = 0;
12128	sp->sinfo_flags = srcv->sinfo_flags;
12129	sp->timetolive = srcv->sinfo_timetolive;
12130	sp->ppid = srcv->sinfo_ppid;
12131	sp->context = srcv->sinfo_context;
12132	(void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12133
12134	sp->stream = srcv->sinfo_stream;
12135	sp->length = min(uio->uio_resid, max_send_len);
12136	if ((sp->length == (uint32_t) uio->uio_resid) &&
12137	    ((user_marks_eor == 0) ||
12138	    (srcv->sinfo_flags & SCTP_EOF) ||
12139	    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12140		sp->msg_is_complete = 1;
12141	} else {
12142		sp->msg_is_complete = 0;
12143	}
12144	sp->sender_all_done = 0;
12145	sp->some_taken = 0;
12146	sp->put_last_out = 0;
12147	resv_in_first = sizeof(struct sctp_data_chunk);
12148	sp->data = sp->tail_mbuf = NULL;
12149	if (sp->length == 0) {
12150		*error = 0;
12151		goto skip_copy;
12152	}
12153	if (srcv->sinfo_keynumber_valid) {
12154		sp->auth_keyid = srcv->sinfo_keynumber;
12155	} else {
12156		sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12157	}
12158	if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12159		sctp_auth_key_acquire(stcb, sp->auth_keyid);
12160		sp->holds_key_ref = 1;
12161	}
12162	*error = sctp_copy_one(sp, uio, resv_in_first);
12163skip_copy:
12164	if (*error) {
12165		sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12166		sp = NULL;
12167	} else {
12168		if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12169			sp->net = net;
12170			atomic_add_int(&sp->net->ref_count, 1);
12171		} else {
12172			sp->net = NULL;
12173		}
12174		sctp_set_prsctp_policy(sp);
12175	}
12176out_now:
12177	return (sp);
12178}
12179
12180
12181int
12182sctp_sosend(struct socket *so,
12183    struct sockaddr *addr,
12184    struct uio *uio,
12185    struct mbuf *top,
12186    struct mbuf *control,
12187    int flags,
12188    struct thread *p
12189)
12190{
12191	int error, use_sndinfo = 0;
12192	struct sctp_sndrcvinfo sndrcvninfo;
12193	struct sockaddr *addr_to_use;
12194
12195#if defined(INET) && defined(INET6)
12196	struct sockaddr_in sin;
12197
12198#endif
12199
12200	if (control) {
12201		/* process cmsg snd/rcv info (maybe a assoc-id) */
12202		if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12203		    sizeof(sndrcvninfo))) {
12204			/* got one */
12205			use_sndinfo = 1;
12206		}
12207	}
12208	addr_to_use = addr;
12209#if defined(INET) && defined(INET6)
12210	if ((addr) && (addr->sa_family == AF_INET6)) {
12211		struct sockaddr_in6 *sin6;
12212
12213		sin6 = (struct sockaddr_in6 *)addr;
12214		if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12215			in6_sin6_2_sin(&sin, sin6);
12216			addr_to_use = (struct sockaddr *)&sin;
12217		}
12218	}
12219#endif
12220	error = sctp_lower_sosend(so, addr_to_use, uio, top,
12221	    control,
12222	    flags,
12223	    use_sndinfo ? &sndrcvninfo : NULL
12224	    ,p
12225	    );
12226	return (error);
12227}
12228
12229
12230int
12231sctp_lower_sosend(struct socket *so,
12232    struct sockaddr *addr,
12233    struct uio *uio,
12234    struct mbuf *i_pak,
12235    struct mbuf *control,
12236    int flags,
12237    struct sctp_sndrcvinfo *srcv
12238    ,
12239    struct thread *p
12240)
12241{
12242	unsigned int sndlen = 0, max_len;
12243	int error, len;
12244	struct mbuf *top = NULL;
12245	int queue_only = 0, queue_only_for_init = 0;
12246	int free_cnt_applied = 0;
12247	int un_sent;
12248	int now_filled = 0;
12249	unsigned int inqueue_bytes = 0;
12250	struct sctp_block_entry be;
12251	struct sctp_inpcb *inp;
12252	struct sctp_tcb *stcb = NULL;
12253	struct timeval now;
12254	struct sctp_nets *net;
12255	struct sctp_association *asoc;
12256	struct sctp_inpcb *t_inp;
12257	int user_marks_eor;
12258	int create_lock_applied = 0;
12259	int nagle_applies = 0;
12260	int some_on_control = 0;
12261	int got_all_of_the_send = 0;
12262	int hold_tcblock = 0;
12263	int non_blocking = 0;
12264	uint32_t local_add_more, local_soresv = 0;
12265	uint16_t port;
12266	uint16_t sinfo_flags;
12267	sctp_assoc_t sinfo_assoc_id;
12268
12269	error = 0;
12270	net = NULL;
12271	stcb = NULL;
12272	asoc = NULL;
12273
12274	t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12275	if (inp == NULL) {
12276		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12277		error = EINVAL;
12278		if (i_pak) {
12279			SCTP_RELEASE_PKT(i_pak);
12280		}
12281		return (error);
12282	}
12283	if ((uio == NULL) && (i_pak == NULL)) {
12284		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12285		return (EINVAL);
12286	}
12287	user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12288	atomic_add_int(&inp->total_sends, 1);
12289	if (uio) {
12290		if (uio->uio_resid < 0) {
12291			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12292			return (EINVAL);
12293		}
12294		sndlen = uio->uio_resid;
12295	} else {
12296		top = SCTP_HEADER_TO_CHAIN(i_pak);
12297		sndlen = SCTP_HEADER_LEN(i_pak);
12298	}
12299	SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12300	    (void *)addr,
12301	    sndlen);
12302	if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12303	    (inp->sctp_socket->so_qlimit)) {
12304		/* The listener can NOT send */
12305		SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12306		error = ENOTCONN;
12307		goto out_unlocked;
12308	}
12309	/**
12310	 * Pre-screen address, if one is given the sin-len
12311	 * must be set correctly!
12312	 */
12313	if (addr) {
12314		union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12315
12316		switch (raddr->sa.sa_family) {
12317#ifdef INET
12318		case AF_INET:
12319			if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12320				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12321				error = EINVAL;
12322				goto out_unlocked;
12323			}
12324			port = raddr->sin.sin_port;
12325			break;
12326#endif
12327#ifdef INET6
12328		case AF_INET6:
12329			if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12330				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12331				error = EINVAL;
12332				goto out_unlocked;
12333			}
12334			port = raddr->sin6.sin6_port;
12335			break;
12336#endif
12337		default:
12338			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12339			error = EAFNOSUPPORT;
12340			goto out_unlocked;
12341		}
12342	} else
12343		port = 0;
12344
12345	if (srcv) {
12346		sinfo_flags = srcv->sinfo_flags;
12347		sinfo_assoc_id = srcv->sinfo_assoc_id;
12348		if (INVALID_SINFO_FLAG(sinfo_flags) ||
12349		    PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12350			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12351			error = EINVAL;
12352			goto out_unlocked;
12353		}
12354		if (srcv->sinfo_flags)
12355			SCTP_STAT_INCR(sctps_sends_with_flags);
12356	} else {
12357		sinfo_flags = inp->def_send.sinfo_flags;
12358		sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12359	}
12360	if (sinfo_flags & SCTP_SENDALL) {
12361		/* its a sendall */
12362		error = sctp_sendall(inp, uio, top, srcv);
12363		top = NULL;
12364		goto out_unlocked;
12365	}
12366	if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12367		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12368		error = EINVAL;
12369		goto out_unlocked;
12370	}
12371	/* now we must find the assoc */
12372	if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12373	    (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12374		SCTP_INP_RLOCK(inp);
12375		stcb = LIST_FIRST(&inp->sctp_asoc_list);
12376		if (stcb) {
12377			SCTP_TCB_LOCK(stcb);
12378			hold_tcblock = 1;
12379		}
12380		SCTP_INP_RUNLOCK(inp);
12381	} else if (sinfo_assoc_id) {
12382		stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12383	} else if (addr) {
12384		/*-
12385		 * Since we did not use findep we must
12386		 * increment it, and if we don't find a tcb
12387		 * decrement it.
12388		 */
12389		SCTP_INP_WLOCK(inp);
12390		SCTP_INP_INCR_REF(inp);
12391		SCTP_INP_WUNLOCK(inp);
12392		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12393		if (stcb == NULL) {
12394			SCTP_INP_WLOCK(inp);
12395			SCTP_INP_DECR_REF(inp);
12396			SCTP_INP_WUNLOCK(inp);
12397		} else {
12398			hold_tcblock = 1;
12399		}
12400	}
12401	if ((stcb == NULL) && (addr)) {
12402		/* Possible implicit send? */
12403		SCTP_ASOC_CREATE_LOCK(inp);
12404		create_lock_applied = 1;
12405		if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12406		    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12407			/* Should I really unlock ? */
12408			SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12409			error = EINVAL;
12410			goto out_unlocked;
12411
12412		}
12413		if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12414		    (addr->sa_family == AF_INET6)) {
12415			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12416			error = EINVAL;
12417			goto out_unlocked;
12418		}
12419		SCTP_INP_WLOCK(inp);
12420		SCTP_INP_INCR_REF(inp);
12421		SCTP_INP_WUNLOCK(inp);
12422		/* With the lock applied look again */
12423		stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12424		if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12425			stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12426		}
12427		if (stcb == NULL) {
12428			SCTP_INP_WLOCK(inp);
12429			SCTP_INP_DECR_REF(inp);
12430			SCTP_INP_WUNLOCK(inp);
12431		} else {
12432			hold_tcblock = 1;
12433		}
12434		if (error) {
12435			goto out_unlocked;
12436		}
12437		if (t_inp != inp) {
12438			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12439			error = ENOTCONN;
12440			goto out_unlocked;
12441		}
12442	}
12443	if (stcb == NULL) {
12444		if (addr == NULL) {
12445			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12446			error = ENOENT;
12447			goto out_unlocked;
12448		} else {
12449			/* We must go ahead and start the INIT process */
12450			uint32_t vrf_id;
12451
12452			if ((sinfo_flags & SCTP_ABORT) ||
12453			    ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12454				/*-
12455				 * User asks to abort a non-existant assoc,
12456				 * or EOF a non-existant assoc with no data
12457				 */
12458				SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12459				error = ENOENT;
12460				goto out_unlocked;
12461			}
12462			/* get an asoc/stcb struct */
12463			vrf_id = inp->def_vrf_id;
12464#ifdef INVARIANTS
12465			if (create_lock_applied == 0) {
12466				panic("Error, should hold create lock and I don't?");
12467			}
12468#endif
12469			stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12470			    p
12471			    );
12472			if (stcb == NULL) {
12473				/* Error is setup for us in the call */
12474				goto out_unlocked;
12475			}
12476			if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12477				stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12478				/*
12479				 * Set the connected flag so we can queue
12480				 * data
12481				 */
12482				soisconnecting(so);
12483			}
12484			hold_tcblock = 1;
12485			if (create_lock_applied) {
12486				SCTP_ASOC_CREATE_UNLOCK(inp);
12487				create_lock_applied = 0;
12488			} else {
12489				SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12490			}
12491			/*
12492			 * Turn on queue only flag to prevent data from
12493			 * being sent
12494			 */
12495			queue_only = 1;
12496			asoc = &stcb->asoc;
12497			SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12498			(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12499
12500			/* initialize authentication params for the assoc */
12501			sctp_initialize_auth_params(inp, stcb);
12502
12503			if (control) {
12504				if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12505					sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12506					hold_tcblock = 0;
12507					stcb = NULL;
12508					goto out_unlocked;
12509				}
12510			}
12511			/* out with the INIT */
12512			queue_only_for_init = 1;
12513			/*-
12514			 * we may want to dig in after this call and adjust the MTU
12515			 * value. It defaulted to 1500 (constant) but the ro
12516			 * structure may now have an update and thus we may need to
12517			 * change it BEFORE we append the message.
12518			 */
12519		}
12520	} else
12521		asoc = &stcb->asoc;
12522	if (srcv == NULL)
12523		srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12524	if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12525		if (addr)
12526			net = sctp_findnet(stcb, addr);
12527		else
12528			net = NULL;
12529		if ((net == NULL) ||
12530		    ((port != 0) && (port != stcb->rport))) {
12531			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12532			error = EINVAL;
12533			goto out_unlocked;
12534		}
12535	} else {
12536		if (stcb->asoc.alternate) {
12537			net = stcb->asoc.alternate;
12538		} else {
12539			net = stcb->asoc.primary_destination;
12540		}
12541	}
12542	atomic_add_int(&stcb->total_sends, 1);
12543	/* Keep the stcb from being freed under our feet */
12544	atomic_add_int(&asoc->refcnt, 1);
12545	free_cnt_applied = 1;
12546
12547	if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12548		if (sndlen > asoc->smallest_mtu) {
12549			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12550			error = EMSGSIZE;
12551			goto out_unlocked;
12552		}
12553	}
12554	if (SCTP_SO_IS_NBIO(so)
12555	    || (flags & MSG_NBIO)
12556	    ) {
12557		non_blocking = 1;
12558	}
12559	/* would we block? */
12560	if (non_blocking) {
12561		if (hold_tcblock == 0) {
12562			SCTP_TCB_LOCK(stcb);
12563			hold_tcblock = 1;
12564		}
12565		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12566		if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12567		    (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12568			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12569			if (sndlen > SCTP_SB_LIMIT_SND(so))
12570				error = EMSGSIZE;
12571			else
12572				error = EWOULDBLOCK;
12573			goto out_unlocked;
12574		}
12575		stcb->asoc.sb_send_resv += sndlen;
12576		SCTP_TCB_UNLOCK(stcb);
12577		hold_tcblock = 0;
12578	} else {
12579		atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12580	}
12581	local_soresv = sndlen;
12582	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12583		SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12584		error = ECONNRESET;
12585		goto out_unlocked;
12586	}
12587	if (create_lock_applied) {
12588		SCTP_ASOC_CREATE_UNLOCK(inp);
12589		create_lock_applied = 0;
12590	}
12591	if (asoc->stream_reset_outstanding) {
12592		/*
12593		 * Can't queue any data while stream reset is underway.
12594		 */
12595		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12596		error = EAGAIN;
12597		goto out_unlocked;
12598	}
12599	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12600	    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12601		queue_only = 1;
12602	}
12603	/* we are now done with all control */
12604	if (control) {
12605		sctp_m_freem(control);
12606		control = NULL;
12607	}
12608	if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12609	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12610	    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12611	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12612		if (srcv->sinfo_flags & SCTP_ABORT) {
12613			;
12614		} else {
12615			SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12616			error = ECONNRESET;
12617			goto out_unlocked;
12618		}
12619	}
12620	/* Ok, we will attempt a msgsnd :> */
12621	if (p) {
12622		p->td_ru.ru_msgsnd++;
12623	}
12624	/* Are we aborting? */
12625	if (srcv->sinfo_flags & SCTP_ABORT) {
12626		struct mbuf *mm;
12627		int tot_demand, tot_out = 0, max_out;
12628
12629		SCTP_STAT_INCR(sctps_sends_with_abort);
12630		if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12631		    (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12632			/* It has to be up before we abort */
12633			/* how big is the user initiated abort? */
12634			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12635			error = EINVAL;
12636			goto out;
12637		}
12638		if (hold_tcblock) {
12639			SCTP_TCB_UNLOCK(stcb);
12640			hold_tcblock = 0;
12641		}
12642		if (top) {
12643			struct mbuf *cntm = NULL;
12644
12645			mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAIT, 1, MT_DATA);
12646			if (sndlen != 0) {
12647				for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12648					tot_out += SCTP_BUF_LEN(cntm);
12649				}
12650			}
12651		} else {
12652			/* Must fit in a MTU */
12653			tot_out = sndlen;
12654			tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12655			if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12656				/* To big */
12657				SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12658				error = EMSGSIZE;
12659				goto out;
12660			}
12661			mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12662		}
12663		if (mm == NULL) {
12664			SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12665			error = ENOMEM;
12666			goto out;
12667		}
12668		max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12669		max_out -= sizeof(struct sctp_abort_msg);
12670		if (tot_out > max_out) {
12671			tot_out = max_out;
12672		}
12673		if (mm) {
12674			struct sctp_paramhdr *ph;
12675
12676			/* now move forward the data pointer */
12677			ph = mtod(mm, struct sctp_paramhdr *);
12678			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12679			ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12680			ph++;
12681			SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12682			if (top == NULL) {
12683				error = uiomove((caddr_t)ph, (int)tot_out, uio);
12684				if (error) {
12685					/*-
12686					 * Here if we can't get his data we
12687					 * still abort we just don't get to
12688					 * send the users note :-0
12689					 */
12690					sctp_m_freem(mm);
12691					mm = NULL;
12692				}
12693			} else {
12694				if (sndlen != 0) {
12695					SCTP_BUF_NEXT(mm) = top;
12696				}
12697			}
12698		}
12699		if (hold_tcblock == 0) {
12700			SCTP_TCB_LOCK(stcb);
12701		}
12702		atomic_add_int(&stcb->asoc.refcnt, -1);
12703		free_cnt_applied = 0;
12704		/* release this lock, otherwise we hang on ourselves */
12705		sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12706		/* now relock the stcb so everything is sane */
12707		hold_tcblock = 0;
12708		stcb = NULL;
12709		/*
12710		 * In this case top is already chained to mm avoid double
12711		 * free, since we free it below if top != NULL and driver
12712		 * would free it after sending the packet out
12713		 */
12714		if (sndlen != 0) {
12715			top = NULL;
12716		}
12717		goto out_unlocked;
12718	}
12719	/* Calculate the maximum we can send */
12720	inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12721	if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12722		if (non_blocking) {
12723			/* we already checked for non-blocking above. */
12724			max_len = sndlen;
12725		} else {
12726			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12727		}
12728	} else {
12729		max_len = 0;
12730	}
12731	if (hold_tcblock) {
12732		SCTP_TCB_UNLOCK(stcb);
12733		hold_tcblock = 0;
12734	}
12735	/* Is the stream no. valid? */
12736	if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12737		/* Invalid stream number */
12738		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12739		error = EINVAL;
12740		goto out_unlocked;
12741	}
12742	if (asoc->strmout == NULL) {
12743		/* huh? software error */
12744		SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12745		error = EFAULT;
12746		goto out_unlocked;
12747	}
12748	/* Unless E_EOR mode is on, we must make a send FIT in one call. */
12749	if ((user_marks_eor == 0) &&
12750	    (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12751		/* It will NEVER fit */
12752		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12753		error = EMSGSIZE;
12754		goto out_unlocked;
12755	}
12756	if ((uio == NULL) && user_marks_eor) {
12757		/*-
12758		 * We do not support eeor mode for
12759		 * sending with mbuf chains (like sendfile).
12760		 */
12761		SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12762		error = EINVAL;
12763		goto out_unlocked;
12764	}
12765	if (user_marks_eor) {
12766		local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12767	} else {
12768		/*-
12769		 * For non-eeor the whole message must fit in
12770		 * the socket send buffer.
12771		 */
12772		local_add_more = sndlen;
12773	}
12774	len = 0;
12775	if (non_blocking) {
12776		goto skip_preblock;
12777	}
12778	if (((max_len <= local_add_more) &&
12779	    (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12780	    (max_len == 0) ||
12781	    ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12782		/* No room right now ! */
12783		SOCKBUF_LOCK(&so->so_snd);
12784		inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12785		while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12786		    ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12787			SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12788			    (unsigned int)SCTP_SB_LIMIT_SND(so),
12789			    inqueue_bytes,
12790			    local_add_more,
12791			    stcb->asoc.stream_queue_cnt,
12792			    stcb->asoc.chunks_on_out_queue,
12793			    SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12794			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12795				sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12796			}
12797			be.error = 0;
12798			stcb->block_entry = &be;
12799			error = sbwait(&so->so_snd);
12800			stcb->block_entry = NULL;
12801			if (error || so->so_error || be.error) {
12802				if (error == 0) {
12803					if (so->so_error)
12804						error = so->so_error;
12805					if (be.error) {
12806						error = be.error;
12807					}
12808				}
12809				SOCKBUF_UNLOCK(&so->so_snd);
12810				goto out_unlocked;
12811			}
12812			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12813				sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12814				    asoc, stcb->asoc.total_output_queue_size);
12815			}
12816			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12817				goto out_unlocked;
12818			}
12819			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12820		}
12821		if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12822			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12823		} else {
12824			max_len = 0;
12825		}
12826		SOCKBUF_UNLOCK(&so->so_snd);
12827	}
12828skip_preblock:
12829	if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12830		goto out_unlocked;
12831	}
12832	/*
12833	 * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12834	 * case NOTE: uio will be null when top/mbuf is passed
12835	 */
12836	if (sndlen == 0) {
12837		if (srcv->sinfo_flags & SCTP_EOF) {
12838			got_all_of_the_send = 1;
12839			goto dataless_eof;
12840		} else {
12841			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12842			error = EINVAL;
12843			goto out;
12844		}
12845	}
12846	if (top == NULL) {
12847		struct sctp_stream_queue_pending *sp;
12848		struct sctp_stream_out *strm;
12849		uint32_t sndout;
12850
12851		SCTP_TCB_SEND_LOCK(stcb);
12852		if ((asoc->stream_locked) &&
12853		    (asoc->stream_locked_on != srcv->sinfo_stream)) {
12854			SCTP_TCB_SEND_UNLOCK(stcb);
12855			SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12856			error = EINVAL;
12857			goto out;
12858		}
12859		SCTP_TCB_SEND_UNLOCK(stcb);
12860
12861		strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12862		if (strm->last_msg_incomplete == 0) {
12863	do_a_copy_in:
12864			sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12865			if ((sp == NULL) || (error)) {
12866				goto out;
12867			}
12868			SCTP_TCB_SEND_LOCK(stcb);
12869			if (sp->msg_is_complete) {
12870				strm->last_msg_incomplete = 0;
12871				asoc->stream_locked = 0;
12872			} else {
12873				/*
12874				 * Just got locked to this guy in case of an
12875				 * interrupt.
12876				 */
12877				strm->last_msg_incomplete = 1;
12878				asoc->stream_locked = 1;
12879				asoc->stream_locked_on = srcv->sinfo_stream;
12880				sp->sender_all_done = 0;
12881			}
12882			sctp_snd_sb_alloc(stcb, sp->length);
12883			atomic_add_int(&asoc->stream_queue_cnt, 1);
12884			if (srcv->sinfo_flags & SCTP_UNORDERED) {
12885				SCTP_STAT_INCR(sctps_sends_with_unord);
12886			}
12887			TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12888			stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12889			SCTP_TCB_SEND_UNLOCK(stcb);
12890		} else {
12891			SCTP_TCB_SEND_LOCK(stcb);
12892			sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12893			SCTP_TCB_SEND_UNLOCK(stcb);
12894			if (sp == NULL) {
12895				/* ???? Huh ??? last msg is gone */
12896#ifdef INVARIANTS
12897				panic("Warning: Last msg marked incomplete, yet nothing left?");
12898#else
12899				SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12900				strm->last_msg_incomplete = 0;
12901#endif
12902				goto do_a_copy_in;
12903
12904			}
12905		}
12906		while (uio->uio_resid > 0) {
12907			/* How much room do we have? */
12908			struct mbuf *new_tail, *mm;
12909
12910			if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12911				max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12912			else
12913				max_len = 0;
12914
12915			if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12916			    (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12917			    (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12918				sndout = 0;
12919				new_tail = NULL;
12920				if (hold_tcblock) {
12921					SCTP_TCB_UNLOCK(stcb);
12922					hold_tcblock = 0;
12923				}
12924				mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12925				if ((mm == NULL) || error) {
12926					if (mm) {
12927						sctp_m_freem(mm);
12928					}
12929					goto out;
12930				}
12931				/* Update the mbuf and count */
12932				SCTP_TCB_SEND_LOCK(stcb);
12933				if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12934					/*
12935					 * we need to get out. Peer probably
12936					 * aborted.
12937					 */
12938					sctp_m_freem(mm);
12939					if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12940						SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12941						error = ECONNRESET;
12942					}
12943					SCTP_TCB_SEND_UNLOCK(stcb);
12944					goto out;
12945				}
12946				if (sp->tail_mbuf) {
12947					/* tack it to the end */
12948					SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12949					sp->tail_mbuf = new_tail;
12950				} else {
12951					/* A stolen mbuf */
12952					sp->data = mm;
12953					sp->tail_mbuf = new_tail;
12954				}
12955				sctp_snd_sb_alloc(stcb, sndout);
12956				atomic_add_int(&sp->length, sndout);
12957				len += sndout;
12958
12959				/* Did we reach EOR? */
12960				if ((uio->uio_resid == 0) &&
12961				    ((user_marks_eor == 0) ||
12962				    (srcv->sinfo_flags & SCTP_EOF) ||
12963				    (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12964					sp->msg_is_complete = 1;
12965				} else {
12966					sp->msg_is_complete = 0;
12967				}
12968				SCTP_TCB_SEND_UNLOCK(stcb);
12969			}
12970			if (uio->uio_resid == 0) {
12971				/* got it all? */
12972				continue;
12973			}
12974			/* PR-SCTP? */
12975			if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12976				/*
12977				 * This is ugly but we must assure locking
12978				 * order
12979				 */
12980				if (hold_tcblock == 0) {
12981					SCTP_TCB_LOCK(stcb);
12982					hold_tcblock = 1;
12983				}
12984				sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12985				inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12986				if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12987					max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12988				else
12989					max_len = 0;
12990				if (max_len > 0) {
12991					continue;
12992				}
12993				SCTP_TCB_UNLOCK(stcb);
12994				hold_tcblock = 0;
12995			}
12996			/* wait for space now */
12997			if (non_blocking) {
12998				/* Non-blocking io in place out */
12999				goto skip_out_eof;
13000			}
13001			/* What about the INIT, send it maybe */
13002			if (queue_only_for_init) {
13003				if (hold_tcblock == 0) {
13004					SCTP_TCB_LOCK(stcb);
13005					hold_tcblock = 1;
13006				}
13007				if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13008					/* a collision took us forward? */
13009					queue_only = 0;
13010				} else {
13011					sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13012					SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13013					queue_only = 1;
13014				}
13015			}
13016			if ((net->flight_size > net->cwnd) &&
13017			    (asoc->sctp_cmt_on_off == 0)) {
13018				SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13019				queue_only = 1;
13020			} else if (asoc->ifp_had_enobuf) {
13021				SCTP_STAT_INCR(sctps_ifnomemqueued);
13022				if (net->flight_size > (2 * net->mtu)) {
13023					queue_only = 1;
13024				}
13025				asoc->ifp_had_enobuf = 0;
13026			}
13027			un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13028			    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13029			if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13030			    (stcb->asoc.total_flight > 0) &&
13031			    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13032			    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13033
13034				/*-
13035				 * Ok, Nagle is set on and we have data outstanding.
13036				 * Don't send anything and let SACKs drive out the
13037				 * data unless wen have a "full" segment to send.
13038				 */
13039				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13040					sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13041				}
13042				SCTP_STAT_INCR(sctps_naglequeued);
13043				nagle_applies = 1;
13044			} else {
13045				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13046					if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13047						sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13048				}
13049				SCTP_STAT_INCR(sctps_naglesent);
13050				nagle_applies = 0;
13051			}
13052			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13053
13054				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13055				    nagle_applies, un_sent);
13056				sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13057				    stcb->asoc.total_flight,
13058				    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13059			}
13060			if (queue_only_for_init)
13061				queue_only_for_init = 0;
13062			if ((queue_only == 0) && (nagle_applies == 0)) {
13063				/*-
13064				 * need to start chunk output
13065				 * before blocking.. note that if
13066				 * a lock is already applied, then
13067				 * the input via the net is happening
13068				 * and I don't need to start output :-D
13069				 */
13070				if (hold_tcblock == 0) {
13071					if (SCTP_TCB_TRYLOCK(stcb)) {
13072						hold_tcblock = 1;
13073						sctp_chunk_output(inp,
13074						    stcb,
13075						    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13076					}
13077				} else {
13078					sctp_chunk_output(inp,
13079					    stcb,
13080					    SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13081				}
13082				if (hold_tcblock == 1) {
13083					SCTP_TCB_UNLOCK(stcb);
13084					hold_tcblock = 0;
13085				}
13086			}
13087			SOCKBUF_LOCK(&so->so_snd);
13088			/*-
13089			 * This is a bit strange, but I think it will
13090			 * work. The total_output_queue_size is locked and
13091			 * protected by the TCB_LOCK, which we just released.
13092			 * There is a race that can occur between releasing it
13093			 * above, and me getting the socket lock, where sacks
13094			 * come in but we have not put the SB_WAIT on the
13095			 * so_snd buffer to get the wakeup. After the LOCK
13096			 * is applied the sack_processing will also need to
13097			 * LOCK the so->so_snd to do the actual sowwakeup(). So
13098			 * once we have the socket buffer lock if we recheck the
13099			 * size we KNOW we will get to sleep safely with the
13100			 * wakeup flag in place.
13101			 */
13102			if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13103			    min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13104				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13105					sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13106					    asoc, uio->uio_resid);
13107				}
13108				be.error = 0;
13109				stcb->block_entry = &be;
13110				error = sbwait(&so->so_snd);
13111				stcb->block_entry = NULL;
13112
13113				if (error || so->so_error || be.error) {
13114					if (error == 0) {
13115						if (so->so_error)
13116							error = so->so_error;
13117						if (be.error) {
13118							error = be.error;
13119						}
13120					}
13121					SOCKBUF_UNLOCK(&so->so_snd);
13122					goto out_unlocked;
13123				}
13124				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13125					sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13126					    asoc, stcb->asoc.total_output_queue_size);
13127				}
13128			}
13129			SOCKBUF_UNLOCK(&so->so_snd);
13130			if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13131				goto out_unlocked;
13132			}
13133		}
13134		SCTP_TCB_SEND_LOCK(stcb);
13135		if (sp) {
13136			if (sp->msg_is_complete == 0) {
13137				strm->last_msg_incomplete = 1;
13138				asoc->stream_locked = 1;
13139				asoc->stream_locked_on = srcv->sinfo_stream;
13140			} else {
13141				sp->sender_all_done = 1;
13142				strm->last_msg_incomplete = 0;
13143				asoc->stream_locked = 0;
13144			}
13145		} else {
13146			SCTP_PRINTF("Huh no sp TSNH?\n");
13147			strm->last_msg_incomplete = 0;
13148			asoc->stream_locked = 0;
13149		}
13150		SCTP_TCB_SEND_UNLOCK(stcb);
13151		if (uio->uio_resid == 0) {
13152			got_all_of_the_send = 1;
13153		}
13154	} else {
13155		/* We send in a 0, since we do NOT have any locks */
13156		error = sctp_msg_append(stcb, net, top, srcv, 0);
13157		top = NULL;
13158		if (srcv->sinfo_flags & SCTP_EOF) {
13159			/*
13160			 * This should only happen for Panda for the mbuf
13161			 * send case, which does NOT yet support EEOR mode.
13162			 * Thus, we can just set this flag to do the proper
13163			 * EOF handling.
13164			 */
13165			got_all_of_the_send = 1;
13166		}
13167	}
13168	if (error) {
13169		goto out;
13170	}
13171dataless_eof:
13172	/* EOF thing ? */
13173	if ((srcv->sinfo_flags & SCTP_EOF) &&
13174	    (got_all_of_the_send == 1)) {
13175		int cnt;
13176
13177		SCTP_STAT_INCR(sctps_sends_with_eof);
13178		error = 0;
13179		if (hold_tcblock == 0) {
13180			SCTP_TCB_LOCK(stcb);
13181			hold_tcblock = 1;
13182		}
13183		cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13184		if (TAILQ_EMPTY(&asoc->send_queue) &&
13185		    TAILQ_EMPTY(&asoc->sent_queue) &&
13186		    (cnt == 0)) {
13187			if (asoc->locked_on_sending) {
13188				goto abort_anyway;
13189			}
13190			/* there is nothing queued to send, so I'm done... */
13191			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13192			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13193			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13194				struct sctp_nets *netp;
13195
13196				/* only send SHUTDOWN the first time through */
13197				if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13198					SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13199				}
13200				SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13201				SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13202				sctp_stop_timers_for_shutdown(stcb);
13203				if (stcb->asoc.alternate) {
13204					netp = stcb->asoc.alternate;
13205				} else {
13206					netp = stcb->asoc.primary_destination;
13207				}
13208				sctp_send_shutdown(stcb, netp);
13209				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13210				    netp);
13211				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13212				    asoc->primary_destination);
13213			}
13214		} else {
13215			/*-
13216			 * we still got (or just got) data to send, so set
13217			 * SHUTDOWN_PENDING
13218			 */
13219			/*-
13220			 * XXX sockets draft says that SCTP_EOF should be
13221			 * sent with no data.  currently, we will allow user
13222			 * data to be sent first and move to
13223			 * SHUTDOWN-PENDING
13224			 */
13225			if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13226			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13227			    (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13228				if (hold_tcblock == 0) {
13229					SCTP_TCB_LOCK(stcb);
13230					hold_tcblock = 1;
13231				}
13232				if (asoc->locked_on_sending) {
13233					/* Locked to send out the data */
13234					struct sctp_stream_queue_pending *sp;
13235
13236					sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13237					if (sp) {
13238						if ((sp->length == 0) && (sp->msg_is_complete == 0))
13239							asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13240					}
13241				}
13242				asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13243				if (TAILQ_EMPTY(&asoc->send_queue) &&
13244				    TAILQ_EMPTY(&asoc->sent_queue) &&
13245				    (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13246			abort_anyway:
13247					if (free_cnt_applied) {
13248						atomic_add_int(&stcb->asoc.refcnt, -1);
13249						free_cnt_applied = 0;
13250					}
13251					sctp_abort_an_association(stcb->sctp_ep, stcb,
13252					    NULL, SCTP_SO_LOCKED);
13253					/*
13254					 * now relock the stcb so everything
13255					 * is sane
13256					 */
13257					hold_tcblock = 0;
13258					stcb = NULL;
13259					goto out;
13260				}
13261				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13262				    asoc->primary_destination);
13263				sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13264			}
13265		}
13266	}
13267skip_out_eof:
13268	if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13269		some_on_control = 1;
13270	}
13271	if (queue_only_for_init) {
13272		if (hold_tcblock == 0) {
13273			SCTP_TCB_LOCK(stcb);
13274			hold_tcblock = 1;
13275		}
13276		if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13277			/* a collision took us forward? */
13278			queue_only = 0;
13279		} else {
13280			sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13281			SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13282			queue_only = 1;
13283		}
13284	}
13285	if ((net->flight_size > net->cwnd) &&
13286	    (stcb->asoc.sctp_cmt_on_off == 0)) {
13287		SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13288		queue_only = 1;
13289	} else if (asoc->ifp_had_enobuf) {
13290		SCTP_STAT_INCR(sctps_ifnomemqueued);
13291		if (net->flight_size > (2 * net->mtu)) {
13292			queue_only = 1;
13293		}
13294		asoc->ifp_had_enobuf = 0;
13295	}
13296	un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13297	    (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13298	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13299	    (stcb->asoc.total_flight > 0) &&
13300	    (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13301	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13302		/*-
13303		 * Ok, Nagle is set on and we have data outstanding.
13304		 * Don't send anything and let SACKs drive out the
13305		 * data unless wen have a "full" segment to send.
13306		 */
13307		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13308			sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13309		}
13310		SCTP_STAT_INCR(sctps_naglequeued);
13311		nagle_applies = 1;
13312	} else {
13313		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13314			if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13315				sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13316		}
13317		SCTP_STAT_INCR(sctps_naglesent);
13318		nagle_applies = 0;
13319	}
13320	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13321		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13322		    nagle_applies, un_sent);
13323		sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13324		    stcb->asoc.total_flight,
13325		    stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13326	}
13327	if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13328		/* we can attempt to send too. */
13329		if (hold_tcblock == 0) {
13330			/*
13331			 * If there is activity recv'ing sacks no need to
13332			 * send
13333			 */
13334			if (SCTP_TCB_TRYLOCK(stcb)) {
13335				sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13336				hold_tcblock = 1;
13337			}
13338		} else {
13339			sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13340		}
13341	} else if ((queue_only == 0) &&
13342		    (stcb->asoc.peers_rwnd == 0) &&
13343	    (stcb->asoc.total_flight == 0)) {
13344		/* We get to have a probe outstanding */
13345		if (hold_tcblock == 0) {
13346			hold_tcblock = 1;
13347			SCTP_TCB_LOCK(stcb);
13348		}
13349		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13350	} else if (some_on_control) {
13351		int num_out, reason, frag_point;
13352
13353		/* Here we do control only */
13354		if (hold_tcblock == 0) {
13355			hold_tcblock = 1;
13356			SCTP_TCB_LOCK(stcb);
13357		}
13358		frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13359		(void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13360		    &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13361	}
13362	SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13363	    queue_only, stcb->asoc.peers_rwnd, un_sent,
13364	    stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13365	    stcb->asoc.total_output_queue_size, error);
13366
13367out:
13368out_unlocked:
13369
13370	if (local_soresv && stcb) {
13371		atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13372	}
13373	if (create_lock_applied) {
13374		SCTP_ASOC_CREATE_UNLOCK(inp);
13375	}
13376	if ((stcb) && hold_tcblock) {
13377		SCTP_TCB_UNLOCK(stcb);
13378	}
13379	if (stcb && free_cnt_applied) {
13380		atomic_add_int(&stcb->asoc.refcnt, -1);
13381	}
13382#ifdef INVARIANTS
13383	if (stcb) {
13384		if (mtx_owned(&stcb->tcb_mtx)) {
13385			panic("Leaving with tcb mtx owned?");
13386		}
13387		if (mtx_owned(&stcb->tcb_send_mtx)) {
13388			panic("Leaving with tcb send mtx owned?");
13389		}
13390	}
13391#endif
13392#ifdef INVARIANTS
13393	if (inp) {
13394		sctp_validate_no_locks(inp);
13395	} else {
13396		SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13397	}
13398#endif
13399	if (top) {
13400		sctp_m_freem(top);
13401	}
13402	if (control) {
13403		sctp_m_freem(control);
13404	}
13405	return (error);
13406}
13407
13408
13409/*
13410 * generate an AUTHentication chunk, if required
13411 */
13412struct mbuf *
13413sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13414    struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13415    struct sctp_tcb *stcb, uint8_t chunk)
13416{
13417	struct mbuf *m_auth;
13418	struct sctp_auth_chunk *auth;
13419	int chunk_len;
13420	struct mbuf *cn;
13421
13422	if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13423	    (stcb == NULL))
13424		return (m);
13425
13426	/* sysctl disabled auth? */
13427	if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13428		return (m);
13429
13430	/* peer doesn't do auth... */
13431	if (!stcb->asoc.peer_supports_auth) {
13432		return (m);
13433	}
13434	/* does the requested chunk require auth? */
13435	if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13436		return (m);
13437	}
13438	m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13439	if (m_auth == NULL) {
13440		/* no mbuf's */
13441		return (m);
13442	}
13443	/* reserve some space if this will be the first mbuf */
13444	if (m == NULL)
13445		SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13446	/* fill in the AUTH chunk details */
13447	auth = mtod(m_auth, struct sctp_auth_chunk *);
13448	bzero(auth, sizeof(*auth));
13449	auth->ch.chunk_type = SCTP_AUTHENTICATION;
13450	auth->ch.chunk_flags = 0;
13451	chunk_len = sizeof(*auth) +
13452	    sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13453	auth->ch.chunk_length = htons(chunk_len);
13454	auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13455	/* key id and hmac digest will be computed and filled in upon send */
13456
13457	/* save the offset where the auth was inserted into the chain */
13458	*offset = 0;
13459	for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13460		*offset += SCTP_BUF_LEN(cn);
13461	}
13462
13463	/* update length and return pointer to the auth chunk */
13464	SCTP_BUF_LEN(m_auth) = chunk_len;
13465	m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13466	if (auth_ret != NULL)
13467		*auth_ret = auth;
13468
13469	return (m);
13470}
13471
13472#ifdef INET6
13473int
13474sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13475{
13476	struct nd_prefix *pfx = NULL;
13477	struct nd_pfxrouter *pfxrtr = NULL;
13478	struct sockaddr_in6 gw6;
13479
13480	if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13481		return (0);
13482
13483	/* get prefix entry of address */
13484	LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13485		if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13486			continue;
13487		if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13488		    &src6->sin6_addr, &pfx->ndpr_mask))
13489			break;
13490	}
13491	/* no prefix entry in the prefix list */
13492	if (pfx == NULL) {
13493		SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13494		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13495		return (0);
13496	}
13497	SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13498	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13499
13500	/* search installed gateway from prefix entry */
13501	LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13502		memset(&gw6, 0, sizeof(struct sockaddr_in6));
13503		gw6.sin6_family = AF_INET6;
13504		gw6.sin6_len = sizeof(struct sockaddr_in6);
13505		memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13506		    sizeof(struct in6_addr));
13507		SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13508		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13509		SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13510		SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13511		if (sctp_cmpaddr((struct sockaddr *)&gw6,
13512		    ro->ro_rt->rt_gateway)) {
13513			SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13514			return (1);
13515		}
13516	}
13517	SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13518	return (0);
13519}
13520
13521#endif
13522
13523int
13524sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13525{
13526#ifdef INET
13527	struct sockaddr_in *sin, *mask;
13528	struct ifaddr *ifa;
13529	struct in_addr srcnetaddr, gwnetaddr;
13530
13531	if (ro == NULL || ro->ro_rt == NULL ||
13532	    sifa->address.sa.sa_family != AF_INET) {
13533		return (0);
13534	}
13535	ifa = (struct ifaddr *)sifa->ifa;
13536	mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13537	sin = (struct sockaddr_in *)&sifa->address.sin;
13538	srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13539	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13540	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13541	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13542
13543	sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13544	gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13545	SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13546	SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13547	SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13548	if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13549		return (1);
13550	}
13551#endif
13552	return (0);
13553}
13554