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[mirror_ubuntu-focal-kernel.git] / net / sctp / stream.c
1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001 Intel Corp.
6 *
7 * This file is part of the SCTP kernel implementation
8 *
9 * This file contains sctp stream maniuplation primitives and helpers.
10 *
11 * This SCTP implementation is free software;
12 * you can redistribute it and/or modify it under the terms of
13 * the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 * This SCTP implementation is distributed in the hope that it
18 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
19 * ************************
20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
21 * See the GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with GNU CC; see the file COPYING. If not, see
25 * <http://www.gnu.org/licenses/>.
26 *
27 * Please send any bug reports or fixes you make to the
28 * email address(es):
29 * lksctp developers <linux-sctp@vger.kernel.org>
30 *
31 * Written or modified by:
32 * Xin Long <lucien.xin@gmail.com>
33 */
34
35 #include <linux/list.h>
36 #include <net/sctp/sctp.h>
37 #include <net/sctp/sm.h>
38 #include <net/sctp/stream_sched.h>
39
40 static struct flex_array *fa_alloc(size_t elem_size, size_t elem_count,
41 gfp_t gfp)
42 {
43 struct flex_array *result;
44 int err;
45
46 result = flex_array_alloc(elem_size, elem_count, gfp);
47 if (result) {
48 err = flex_array_prealloc(result, 0, elem_count, gfp);
49 if (err) {
50 flex_array_free(result);
51 result = NULL;
52 }
53 }
54
55 return result;
56 }
57
58 static void fa_free(struct flex_array *fa)
59 {
60 if (fa)
61 flex_array_free(fa);
62 }
63
64 static void fa_copy(struct flex_array *fa, struct flex_array *from,
65 size_t index, size_t count)
66 {
67 void *elem;
68
69 while (count--) {
70 elem = flex_array_get(from, index);
71 flex_array_put(fa, index, elem, 0);
72 index++;
73 }
74 }
75
76 static void fa_zero(struct flex_array *fa, size_t index, size_t count)
77 {
78 void *elem;
79
80 while (count--) {
81 elem = flex_array_get(fa, index);
82 memset(elem, 0, fa->element_size);
83 index++;
84 }
85 }
86
87 /* Migrates chunks from stream queues to new stream queues if needed,
88 * but not across associations. Also, removes those chunks to streams
89 * higher than the new max.
90 */
91 static void sctp_stream_outq_migrate(struct sctp_stream *stream,
92 struct sctp_stream *new, __u16 outcnt)
93 {
94 struct sctp_association *asoc;
95 struct sctp_chunk *ch, *temp;
96 struct sctp_outq *outq;
97 int i;
98
99 asoc = container_of(stream, struct sctp_association, stream);
100 outq = &asoc->outqueue;
101
102 list_for_each_entry_safe(ch, temp, &outq->out_chunk_list, list) {
103 __u16 sid = sctp_chunk_stream_no(ch);
104
105 if (sid < outcnt)
106 continue;
107
108 sctp_sched_dequeue_common(outq, ch);
109 /* No need to call dequeue_done here because
110 * the chunks are not scheduled by now.
111 */
112
113 /* Mark as failed send. */
114 sctp_chunk_fail(ch, (__force __u32)SCTP_ERROR_INV_STRM);
115 if (asoc->peer.prsctp_capable &&
116 SCTP_PR_PRIO_ENABLED(ch->sinfo.sinfo_flags))
117 asoc->sent_cnt_removable--;
118
119 sctp_chunk_free(ch);
120 }
121
122 if (new) {
123 /* Here we actually move the old ext stuff into the new
124 * buffer, because we want to keep it. Then
125 * sctp_stream_update will swap ->out pointers.
126 */
127 for (i = 0; i < outcnt; i++) {
128 kfree(SCTP_SO(new, i)->ext);
129 SCTP_SO(new, i)->ext = SCTP_SO(stream, i)->ext;
130 SCTP_SO(stream, i)->ext = NULL;
131 }
132 }
133
134 for (i = outcnt; i < stream->outcnt; i++)
135 kfree(SCTP_SO(stream, i)->ext);
136 }
137
138 static int sctp_stream_alloc_out(struct sctp_stream *stream, __u16 outcnt,
139 gfp_t gfp)
140 {
141 struct flex_array *out;
142 size_t elem_size = sizeof(struct sctp_stream_out);
143
144 out = fa_alloc(elem_size, outcnt, gfp);
145 if (!out)
146 return -ENOMEM;
147
148 if (stream->out) {
149 fa_copy(out, stream->out, 0, min(outcnt, stream->outcnt));
150 fa_free(stream->out);
151 }
152
153 if (outcnt > stream->outcnt)
154 fa_zero(out, stream->outcnt, (outcnt - stream->outcnt));
155
156 stream->out = out;
157
158 return 0;
159 }
160
161 static int sctp_stream_alloc_in(struct sctp_stream *stream, __u16 incnt,
162 gfp_t gfp)
163 {
164 struct flex_array *in;
165 size_t elem_size = sizeof(struct sctp_stream_in);
166
167 in = fa_alloc(elem_size, incnt, gfp);
168 if (!in)
169 return -ENOMEM;
170
171 if (stream->in) {
172 fa_copy(in, stream->in, 0, min(incnt, stream->incnt));
173 fa_free(stream->in);
174 }
175
176 if (incnt > stream->incnt)
177 fa_zero(in, stream->incnt, (incnt - stream->incnt));
178
179 stream->in = in;
180
181 return 0;
182 }
183
184 int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
185 gfp_t gfp)
186 {
187 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
188 int i, ret = 0;
189
190 gfp |= __GFP_NOWARN;
191
192 /* Initial stream->out size may be very big, so free it and alloc
193 * a new one with new outcnt to save memory if needed.
194 */
195 if (outcnt == stream->outcnt)
196 goto in;
197
198 /* Filter out chunks queued on streams that won't exist anymore */
199 sched->unsched_all(stream);
200 sctp_stream_outq_migrate(stream, NULL, outcnt);
201 sched->sched_all(stream);
202
203 ret = sctp_stream_alloc_out(stream, outcnt, gfp);
204 if (ret)
205 goto out;
206
207 stream->outcnt = outcnt;
208 for (i = 0; i < stream->outcnt; i++)
209 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
210
211 sched->init(stream);
212
213 in:
214 sctp_stream_interleave_init(stream);
215 if (!incnt)
216 goto out;
217
218 ret = sctp_stream_alloc_in(stream, incnt, gfp);
219 if (ret) {
220 sched->free(stream);
221 fa_free(stream->out);
222 stream->out = NULL;
223 stream->outcnt = 0;
224 goto out;
225 }
226
227 stream->incnt = incnt;
228
229 out:
230 return ret;
231 }
232
233 int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid)
234 {
235 struct sctp_stream_out_ext *soute;
236
237 soute = kzalloc(sizeof(*soute), GFP_KERNEL);
238 if (!soute)
239 return -ENOMEM;
240 SCTP_SO(stream, sid)->ext = soute;
241
242 return sctp_sched_init_sid(stream, sid, GFP_KERNEL);
243 }
244
245 void sctp_stream_free(struct sctp_stream *stream)
246 {
247 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
248 int i;
249
250 sched->free(stream);
251 for (i = 0; i < stream->outcnt; i++)
252 kfree(SCTP_SO(stream, i)->ext);
253 fa_free(stream->out);
254 fa_free(stream->in);
255 }
256
257 void sctp_stream_clear(struct sctp_stream *stream)
258 {
259 int i;
260
261 for (i = 0; i < stream->outcnt; i++) {
262 SCTP_SO(stream, i)->mid = 0;
263 SCTP_SO(stream, i)->mid_uo = 0;
264 }
265
266 for (i = 0; i < stream->incnt; i++)
267 SCTP_SI(stream, i)->mid = 0;
268 }
269
270 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new)
271 {
272 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
273
274 sched->unsched_all(stream);
275 sctp_stream_outq_migrate(stream, new, new->outcnt);
276 sctp_stream_free(stream);
277
278 stream->out = new->out;
279 stream->in = new->in;
280 stream->outcnt = new->outcnt;
281 stream->incnt = new->incnt;
282
283 sched->sched_all(stream);
284
285 new->out = NULL;
286 new->in = NULL;
287 new->outcnt = 0;
288 new->incnt = 0;
289 }
290
291 static int sctp_send_reconf(struct sctp_association *asoc,
292 struct sctp_chunk *chunk)
293 {
294 struct net *net = sock_net(asoc->base.sk);
295 int retval = 0;
296
297 retval = sctp_primitive_RECONF(net, asoc, chunk);
298 if (retval)
299 sctp_chunk_free(chunk);
300
301 return retval;
302 }
303
304 static bool sctp_stream_outq_is_empty(struct sctp_stream *stream,
305 __u16 str_nums, __be16 *str_list)
306 {
307 struct sctp_association *asoc;
308 __u16 i;
309
310 asoc = container_of(stream, struct sctp_association, stream);
311 if (!asoc->outqueue.out_qlen)
312 return true;
313
314 if (!str_nums)
315 return false;
316
317 for (i = 0; i < str_nums; i++) {
318 __u16 sid = ntohs(str_list[i]);
319
320 if (SCTP_SO(stream, sid)->ext &&
321 !list_empty(&SCTP_SO(stream, sid)->ext->outq))
322 return false;
323 }
324
325 return true;
326 }
327
328 int sctp_send_reset_streams(struct sctp_association *asoc,
329 struct sctp_reset_streams *params)
330 {
331 struct sctp_stream *stream = &asoc->stream;
332 __u16 i, str_nums, *str_list;
333 struct sctp_chunk *chunk;
334 int retval = -EINVAL;
335 __be16 *nstr_list;
336 bool out, in;
337
338 if (!asoc->peer.reconf_capable ||
339 !(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) {
340 retval = -ENOPROTOOPT;
341 goto out;
342 }
343
344 if (asoc->strreset_outstanding) {
345 retval = -EINPROGRESS;
346 goto out;
347 }
348
349 out = params->srs_flags & SCTP_STREAM_RESET_OUTGOING;
350 in = params->srs_flags & SCTP_STREAM_RESET_INCOMING;
351 if (!out && !in)
352 goto out;
353
354 str_nums = params->srs_number_streams;
355 str_list = params->srs_stream_list;
356 if (str_nums) {
357 int param_len = 0;
358
359 if (out) {
360 for (i = 0; i < str_nums; i++)
361 if (str_list[i] >= stream->outcnt)
362 goto out;
363
364 param_len = str_nums * sizeof(__u16) +
365 sizeof(struct sctp_strreset_outreq);
366 }
367
368 if (in) {
369 for (i = 0; i < str_nums; i++)
370 if (str_list[i] >= stream->incnt)
371 goto out;
372
373 param_len += str_nums * sizeof(__u16) +
374 sizeof(struct sctp_strreset_inreq);
375 }
376
377 if (param_len > SCTP_MAX_CHUNK_LEN -
378 sizeof(struct sctp_reconf_chunk))
379 goto out;
380 }
381
382 nstr_list = kcalloc(str_nums, sizeof(__be16), GFP_KERNEL);
383 if (!nstr_list) {
384 retval = -ENOMEM;
385 goto out;
386 }
387
388 for (i = 0; i < str_nums; i++)
389 nstr_list[i] = htons(str_list[i]);
390
391 if (out && !sctp_stream_outq_is_empty(stream, str_nums, nstr_list)) {
392 retval = -EAGAIN;
393 goto out;
394 }
395
396 chunk = sctp_make_strreset_req(asoc, str_nums, nstr_list, out, in);
397
398 kfree(nstr_list);
399
400 if (!chunk) {
401 retval = -ENOMEM;
402 goto out;
403 }
404
405 if (out) {
406 if (str_nums)
407 for (i = 0; i < str_nums; i++)
408 SCTP_SO(stream, str_list[i])->state =
409 SCTP_STREAM_CLOSED;
410 else
411 for (i = 0; i < stream->outcnt; i++)
412 SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
413 }
414
415 asoc->strreset_chunk = chunk;
416 sctp_chunk_hold(asoc->strreset_chunk);
417
418 retval = sctp_send_reconf(asoc, chunk);
419 if (retval) {
420 sctp_chunk_put(asoc->strreset_chunk);
421 asoc->strreset_chunk = NULL;
422 if (!out)
423 goto out;
424
425 if (str_nums)
426 for (i = 0; i < str_nums; i++)
427 SCTP_SO(stream, str_list[i])->state =
428 SCTP_STREAM_OPEN;
429 else
430 for (i = 0; i < stream->outcnt; i++)
431 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
432
433 goto out;
434 }
435
436 asoc->strreset_outstanding = out + in;
437
438 out:
439 return retval;
440 }
441
442 int sctp_send_reset_assoc(struct sctp_association *asoc)
443 {
444 struct sctp_stream *stream = &asoc->stream;
445 struct sctp_chunk *chunk = NULL;
446 int retval;
447 __u16 i;
448
449 if (!asoc->peer.reconf_capable ||
450 !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
451 return -ENOPROTOOPT;
452
453 if (asoc->strreset_outstanding)
454 return -EINPROGRESS;
455
456 if (!sctp_outq_is_empty(&asoc->outqueue))
457 return -EAGAIN;
458
459 chunk = sctp_make_strreset_tsnreq(asoc);
460 if (!chunk)
461 return -ENOMEM;
462
463 /* Block further xmit of data until this request is completed */
464 for (i = 0; i < stream->outcnt; i++)
465 SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
466
467 asoc->strreset_chunk = chunk;
468 sctp_chunk_hold(asoc->strreset_chunk);
469
470 retval = sctp_send_reconf(asoc, chunk);
471 if (retval) {
472 sctp_chunk_put(asoc->strreset_chunk);
473 asoc->strreset_chunk = NULL;
474
475 for (i = 0; i < stream->outcnt; i++)
476 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
477
478 return retval;
479 }
480
481 asoc->strreset_outstanding = 1;
482
483 return 0;
484 }
485
486 int sctp_send_add_streams(struct sctp_association *asoc,
487 struct sctp_add_streams *params)
488 {
489 struct sctp_stream *stream = &asoc->stream;
490 struct sctp_chunk *chunk = NULL;
491 int retval;
492 __u32 outcnt, incnt;
493 __u16 out, in;
494
495 if (!asoc->peer.reconf_capable ||
496 !(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
497 retval = -ENOPROTOOPT;
498 goto out;
499 }
500
501 if (asoc->strreset_outstanding) {
502 retval = -EINPROGRESS;
503 goto out;
504 }
505
506 out = params->sas_outstrms;
507 in = params->sas_instrms;
508 outcnt = stream->outcnt + out;
509 incnt = stream->incnt + in;
510 if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM ||
511 (!out && !in)) {
512 retval = -EINVAL;
513 goto out;
514 }
515
516 if (out) {
517 retval = sctp_stream_alloc_out(stream, outcnt, GFP_KERNEL);
518 if (retval)
519 goto out;
520 }
521
522 chunk = sctp_make_strreset_addstrm(asoc, out, in);
523 if (!chunk) {
524 retval = -ENOMEM;
525 goto out;
526 }
527
528 asoc->strreset_chunk = chunk;
529 sctp_chunk_hold(asoc->strreset_chunk);
530
531 retval = sctp_send_reconf(asoc, chunk);
532 if (retval) {
533 sctp_chunk_put(asoc->strreset_chunk);
534 asoc->strreset_chunk = NULL;
535 goto out;
536 }
537
538 stream->outcnt = outcnt;
539
540 asoc->strreset_outstanding = !!out + !!in;
541
542 out:
543 return retval;
544 }
545
546 static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param(
547 struct sctp_association *asoc, __be32 resp_seq,
548 __be16 type)
549 {
550 struct sctp_chunk *chunk = asoc->strreset_chunk;
551 struct sctp_reconf_chunk *hdr;
552 union sctp_params param;
553
554 if (!chunk)
555 return NULL;
556
557 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
558 sctp_walk_params(param, hdr, params) {
559 /* sctp_strreset_tsnreq is actually the basic structure
560 * of all stream reconf params, so it's safe to use it
561 * to access request_seq.
562 */
563 struct sctp_strreset_tsnreq *req = param.v;
564
565 if ((!resp_seq || req->request_seq == resp_seq) &&
566 (!type || type == req->param_hdr.type))
567 return param.v;
568 }
569
570 return NULL;
571 }
572
573 static void sctp_update_strreset_result(struct sctp_association *asoc,
574 __u32 result)
575 {
576 asoc->strreset_result[1] = asoc->strreset_result[0];
577 asoc->strreset_result[0] = result;
578 }
579
580 struct sctp_chunk *sctp_process_strreset_outreq(
581 struct sctp_association *asoc,
582 union sctp_params param,
583 struct sctp_ulpevent **evp)
584 {
585 struct sctp_strreset_outreq *outreq = param.v;
586 struct sctp_stream *stream = &asoc->stream;
587 __u32 result = SCTP_STRRESET_DENIED;
588 __u16 i, nums, flags = 0;
589 __be16 *str_p = NULL;
590 __u32 request_seq;
591
592 request_seq = ntohl(outreq->request_seq);
593
594 if (ntohl(outreq->send_reset_at_tsn) >
595 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) {
596 result = SCTP_STRRESET_IN_PROGRESS;
597 goto err;
598 }
599
600 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
601 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
602 result = SCTP_STRRESET_ERR_BAD_SEQNO;
603 goto err;
604 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
605 i = asoc->strreset_inseq - request_seq - 1;
606 result = asoc->strreset_result[i];
607 goto err;
608 }
609 asoc->strreset_inseq++;
610
611 /* Check strreset_enable after inseq inc, as sender cannot tell
612 * the peer doesn't enable strreset after receiving response with
613 * result denied, as well as to keep consistent with bsd.
614 */
615 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
616 goto out;
617
618 if (asoc->strreset_chunk) {
619 if (!sctp_chunk_lookup_strreset_param(
620 asoc, outreq->response_seq,
621 SCTP_PARAM_RESET_IN_REQUEST)) {
622 /* same process with outstanding isn't 0 */
623 result = SCTP_STRRESET_ERR_IN_PROGRESS;
624 goto out;
625 }
626
627 asoc->strreset_outstanding--;
628 asoc->strreset_outseq++;
629
630 if (!asoc->strreset_outstanding) {
631 struct sctp_transport *t;
632
633 t = asoc->strreset_chunk->transport;
634 if (del_timer(&t->reconf_timer))
635 sctp_transport_put(t);
636
637 sctp_chunk_put(asoc->strreset_chunk);
638 asoc->strreset_chunk = NULL;
639 }
640
641 flags = SCTP_STREAM_RESET_INCOMING_SSN;
642 }
643
644 nums = (ntohs(param.p->length) - sizeof(*outreq)) / sizeof(__u16);
645 if (nums) {
646 str_p = outreq->list_of_streams;
647 for (i = 0; i < nums; i++) {
648 if (ntohs(str_p[i]) >= stream->incnt) {
649 result = SCTP_STRRESET_ERR_WRONG_SSN;
650 goto out;
651 }
652 }
653
654 for (i = 0; i < nums; i++)
655 SCTP_SI(stream, ntohs(str_p[i]))->mid = 0;
656 } else {
657 for (i = 0; i < stream->incnt; i++)
658 SCTP_SI(stream, i)->mid = 0;
659 }
660
661 result = SCTP_STRRESET_PERFORMED;
662
663 *evp = sctp_ulpevent_make_stream_reset_event(asoc,
664 flags | SCTP_STREAM_RESET_OUTGOING_SSN, nums, str_p,
665 GFP_ATOMIC);
666
667 out:
668 sctp_update_strreset_result(asoc, result);
669 err:
670 return sctp_make_strreset_resp(asoc, result, request_seq);
671 }
672
673 struct sctp_chunk *sctp_process_strreset_inreq(
674 struct sctp_association *asoc,
675 union sctp_params param,
676 struct sctp_ulpevent **evp)
677 {
678 struct sctp_strreset_inreq *inreq = param.v;
679 struct sctp_stream *stream = &asoc->stream;
680 __u32 result = SCTP_STRRESET_DENIED;
681 struct sctp_chunk *chunk = NULL;
682 __u32 request_seq;
683 __u16 i, nums;
684 __be16 *str_p;
685
686 request_seq = ntohl(inreq->request_seq);
687 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
688 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
689 result = SCTP_STRRESET_ERR_BAD_SEQNO;
690 goto err;
691 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
692 i = asoc->strreset_inseq - request_seq - 1;
693 result = asoc->strreset_result[i];
694 if (result == SCTP_STRRESET_PERFORMED)
695 return NULL;
696 goto err;
697 }
698 asoc->strreset_inseq++;
699
700 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ))
701 goto out;
702
703 if (asoc->strreset_outstanding) {
704 result = SCTP_STRRESET_ERR_IN_PROGRESS;
705 goto out;
706 }
707
708 nums = (ntohs(param.p->length) - sizeof(*inreq)) / sizeof(__u16);
709 str_p = inreq->list_of_streams;
710 for (i = 0; i < nums; i++) {
711 if (ntohs(str_p[i]) >= stream->outcnt) {
712 result = SCTP_STRRESET_ERR_WRONG_SSN;
713 goto out;
714 }
715 }
716
717 if (!sctp_stream_outq_is_empty(stream, nums, str_p)) {
718 result = SCTP_STRRESET_IN_PROGRESS;
719 asoc->strreset_inseq--;
720 goto err;
721 }
722
723 chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0);
724 if (!chunk)
725 goto out;
726
727 if (nums)
728 for (i = 0; i < nums; i++)
729 SCTP_SO(stream, ntohs(str_p[i]))->state =
730 SCTP_STREAM_CLOSED;
731 else
732 for (i = 0; i < stream->outcnt; i++)
733 SCTP_SO(stream, i)->state = SCTP_STREAM_CLOSED;
734
735 asoc->strreset_chunk = chunk;
736 asoc->strreset_outstanding = 1;
737 sctp_chunk_hold(asoc->strreset_chunk);
738
739 result = SCTP_STRRESET_PERFORMED;
740
741 *evp = sctp_ulpevent_make_stream_reset_event(asoc,
742 SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC);
743
744 out:
745 sctp_update_strreset_result(asoc, result);
746 err:
747 if (!chunk)
748 chunk = sctp_make_strreset_resp(asoc, result, request_seq);
749
750 return chunk;
751 }
752
753 struct sctp_chunk *sctp_process_strreset_tsnreq(
754 struct sctp_association *asoc,
755 union sctp_params param,
756 struct sctp_ulpevent **evp)
757 {
758 __u32 init_tsn = 0, next_tsn = 0, max_tsn_seen;
759 struct sctp_strreset_tsnreq *tsnreq = param.v;
760 struct sctp_stream *stream = &asoc->stream;
761 __u32 result = SCTP_STRRESET_DENIED;
762 __u32 request_seq;
763 __u16 i;
764
765 request_seq = ntohl(tsnreq->request_seq);
766 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
767 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
768 result = SCTP_STRRESET_ERR_BAD_SEQNO;
769 goto err;
770 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
771 i = asoc->strreset_inseq - request_seq - 1;
772 result = asoc->strreset_result[i];
773 if (result == SCTP_STRRESET_PERFORMED) {
774 next_tsn = asoc->ctsn_ack_point + 1;
775 init_tsn =
776 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1;
777 }
778 goto err;
779 }
780
781 if (!sctp_outq_is_empty(&asoc->outqueue)) {
782 result = SCTP_STRRESET_IN_PROGRESS;
783 goto err;
784 }
785
786 asoc->strreset_inseq++;
787
788 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ))
789 goto out;
790
791 if (asoc->strreset_outstanding) {
792 result = SCTP_STRRESET_ERR_IN_PROGRESS;
793 goto out;
794 }
795
796 /* G4: The same processing as though a FWD-TSN chunk (as defined in
797 * [RFC3758]) with all streams affected and a new cumulative TSN
798 * ACK of the Receiver's Next TSN minus 1 were received MUST be
799 * performed.
800 */
801 max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
802 asoc->stream.si->report_ftsn(&asoc->ulpq, max_tsn_seen);
803
804 /* G1: Compute an appropriate value for the Receiver's Next TSN -- the
805 * TSN that the peer should use to send the next DATA chunk. The
806 * value SHOULD be the smallest TSN not acknowledged by the
807 * receiver of the request plus 2^31.
808 */
809 init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + (1 << 31);
810 sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
811 init_tsn, GFP_ATOMIC);
812
813 /* G3: The same processing as though a SACK chunk with no gap report
814 * and a cumulative TSN ACK of the Sender's Next TSN minus 1 were
815 * received MUST be performed.
816 */
817 sctp_outq_free(&asoc->outqueue);
818
819 /* G2: Compute an appropriate value for the local endpoint's next TSN,
820 * i.e., the next TSN assigned by the receiver of the SSN/TSN reset
821 * chunk. The value SHOULD be the highest TSN sent by the receiver
822 * of the request plus 1.
823 */
824 next_tsn = asoc->next_tsn;
825 asoc->ctsn_ack_point = next_tsn - 1;
826 asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
827
828 /* G5: The next expected and outgoing SSNs MUST be reset to 0 for all
829 * incoming and outgoing streams.
830 */
831 for (i = 0; i < stream->outcnt; i++) {
832 SCTP_SO(stream, i)->mid = 0;
833 SCTP_SO(stream, i)->mid_uo = 0;
834 }
835 for (i = 0; i < stream->incnt; i++)
836 SCTP_SI(stream, i)->mid = 0;
837
838 result = SCTP_STRRESET_PERFORMED;
839
840 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, 0, init_tsn,
841 next_tsn, GFP_ATOMIC);
842
843 out:
844 sctp_update_strreset_result(asoc, result);
845 err:
846 return sctp_make_strreset_tsnresp(asoc, result, request_seq,
847 next_tsn, init_tsn);
848 }
849
850 struct sctp_chunk *sctp_process_strreset_addstrm_out(
851 struct sctp_association *asoc,
852 union sctp_params param,
853 struct sctp_ulpevent **evp)
854 {
855 struct sctp_strreset_addstrm *addstrm = param.v;
856 struct sctp_stream *stream = &asoc->stream;
857 __u32 result = SCTP_STRRESET_DENIED;
858 __u32 request_seq, incnt;
859 __u16 in, i;
860
861 request_seq = ntohl(addstrm->request_seq);
862 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
863 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
864 result = SCTP_STRRESET_ERR_BAD_SEQNO;
865 goto err;
866 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
867 i = asoc->strreset_inseq - request_seq - 1;
868 result = asoc->strreset_result[i];
869 goto err;
870 }
871 asoc->strreset_inseq++;
872
873 if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
874 goto out;
875
876 if (asoc->strreset_chunk) {
877 if (!sctp_chunk_lookup_strreset_param(
878 asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) {
879 /* same process with outstanding isn't 0 */
880 result = SCTP_STRRESET_ERR_IN_PROGRESS;
881 goto out;
882 }
883
884 asoc->strreset_outstanding--;
885 asoc->strreset_outseq++;
886
887 if (!asoc->strreset_outstanding) {
888 struct sctp_transport *t;
889
890 t = asoc->strreset_chunk->transport;
891 if (del_timer(&t->reconf_timer))
892 sctp_transport_put(t);
893
894 sctp_chunk_put(asoc->strreset_chunk);
895 asoc->strreset_chunk = NULL;
896 }
897 }
898
899 in = ntohs(addstrm->number_of_streams);
900 incnt = stream->incnt + in;
901 if (!in || incnt > SCTP_MAX_STREAM)
902 goto out;
903
904 if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC))
905 goto out;
906
907 stream->incnt = incnt;
908
909 result = SCTP_STRRESET_PERFORMED;
910
911 *evp = sctp_ulpevent_make_stream_change_event(asoc,
912 0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC);
913
914 out:
915 sctp_update_strreset_result(asoc, result);
916 err:
917 return sctp_make_strreset_resp(asoc, result, request_seq);
918 }
919
920 struct sctp_chunk *sctp_process_strreset_addstrm_in(
921 struct sctp_association *asoc,
922 union sctp_params param,
923 struct sctp_ulpevent **evp)
924 {
925 struct sctp_strreset_addstrm *addstrm = param.v;
926 struct sctp_stream *stream = &asoc->stream;
927 __u32 result = SCTP_STRRESET_DENIED;
928 struct sctp_chunk *chunk = NULL;
929 __u32 request_seq, outcnt;
930 __u16 out, i;
931 int ret;
932
933 request_seq = ntohl(addstrm->request_seq);
934 if (TSN_lt(asoc->strreset_inseq, request_seq) ||
935 TSN_lt(request_seq, asoc->strreset_inseq - 2)) {
936 result = SCTP_STRRESET_ERR_BAD_SEQNO;
937 goto err;
938 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) {
939 i = asoc->strreset_inseq - request_seq - 1;
940 result = asoc->strreset_result[i];
941 if (result == SCTP_STRRESET_PERFORMED)
942 return NULL;
943 goto err;
944 }
945 asoc->strreset_inseq++;
946
947 if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
948 goto out;
949
950 if (asoc->strreset_outstanding) {
951 result = SCTP_STRRESET_ERR_IN_PROGRESS;
952 goto out;
953 }
954
955 out = ntohs(addstrm->number_of_streams);
956 outcnt = stream->outcnt + out;
957 if (!out || outcnt > SCTP_MAX_STREAM)
958 goto out;
959
960 ret = sctp_stream_alloc_out(stream, outcnt, GFP_ATOMIC);
961 if (ret)
962 goto out;
963
964 chunk = sctp_make_strreset_addstrm(asoc, out, 0);
965 if (!chunk)
966 goto out;
967
968 asoc->strreset_chunk = chunk;
969 asoc->strreset_outstanding = 1;
970 sctp_chunk_hold(asoc->strreset_chunk);
971
972 stream->outcnt = outcnt;
973
974 result = SCTP_STRRESET_PERFORMED;
975
976 *evp = sctp_ulpevent_make_stream_change_event(asoc,
977 0, 0, ntohs(addstrm->number_of_streams), GFP_ATOMIC);
978
979 out:
980 sctp_update_strreset_result(asoc, result);
981 err:
982 if (!chunk)
983 chunk = sctp_make_strreset_resp(asoc, result, request_seq);
984
985 return chunk;
986 }
987
988 struct sctp_chunk *sctp_process_strreset_resp(
989 struct sctp_association *asoc,
990 union sctp_params param,
991 struct sctp_ulpevent **evp)
992 {
993 struct sctp_stream *stream = &asoc->stream;
994 struct sctp_strreset_resp *resp = param.v;
995 struct sctp_transport *t;
996 __u16 i, nums, flags = 0;
997 struct sctp_paramhdr *req;
998 __u32 result;
999
1000 req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0);
1001 if (!req)
1002 return NULL;
1003
1004 result = ntohl(resp->result);
1005 if (result != SCTP_STRRESET_PERFORMED) {
1006 /* if in progress, do nothing but retransmit */
1007 if (result == SCTP_STRRESET_IN_PROGRESS)
1008 return NULL;
1009 else if (result == SCTP_STRRESET_DENIED)
1010 flags = SCTP_STREAM_RESET_DENIED;
1011 else
1012 flags = SCTP_STREAM_RESET_FAILED;
1013 }
1014
1015 if (req->type == SCTP_PARAM_RESET_OUT_REQUEST) {
1016 struct sctp_strreset_outreq *outreq;
1017 __be16 *str_p;
1018
1019 outreq = (struct sctp_strreset_outreq *)req;
1020 str_p = outreq->list_of_streams;
1021 nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) /
1022 sizeof(__u16);
1023
1024 if (result == SCTP_STRRESET_PERFORMED) {
1025 struct sctp_stream_out *sout;
1026 if (nums) {
1027 for (i = 0; i < nums; i++) {
1028 sout = SCTP_SO(stream, ntohs(str_p[i]));
1029 sout->mid = 0;
1030 sout->mid_uo = 0;
1031 }
1032 } else {
1033 for (i = 0; i < stream->outcnt; i++) {
1034 sout = SCTP_SO(stream, i);
1035 sout->mid = 0;
1036 sout->mid_uo = 0;
1037 }
1038 }
1039
1040 flags = SCTP_STREAM_RESET_OUTGOING_SSN;
1041 }
1042
1043 for (i = 0; i < stream->outcnt; i++)
1044 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
1045
1046 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
1047 nums, str_p, GFP_ATOMIC);
1048 } else if (req->type == SCTP_PARAM_RESET_IN_REQUEST) {
1049 struct sctp_strreset_inreq *inreq;
1050 __be16 *str_p;
1051
1052 /* if the result is performed, it's impossible for inreq */
1053 if (result == SCTP_STRRESET_PERFORMED)
1054 return NULL;
1055
1056 inreq = (struct sctp_strreset_inreq *)req;
1057 str_p = inreq->list_of_streams;
1058 nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) /
1059 sizeof(__u16);
1060
1061 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags,
1062 nums, str_p, GFP_ATOMIC);
1063 } else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) {
1064 struct sctp_strreset_resptsn *resptsn;
1065 __u32 stsn, rtsn;
1066
1067 /* check for resptsn, as sctp_verify_reconf didn't do it*/
1068 if (ntohs(param.p->length) != sizeof(*resptsn))
1069 return NULL;
1070
1071 resptsn = (struct sctp_strreset_resptsn *)resp;
1072 stsn = ntohl(resptsn->senders_next_tsn);
1073 rtsn = ntohl(resptsn->receivers_next_tsn);
1074
1075 if (result == SCTP_STRRESET_PERFORMED) {
1076 __u32 mtsn = sctp_tsnmap_get_max_tsn_seen(
1077 &asoc->peer.tsn_map);
1078 LIST_HEAD(temp);
1079
1080 asoc->stream.si->report_ftsn(&asoc->ulpq, mtsn);
1081
1082 sctp_tsnmap_init(&asoc->peer.tsn_map,
1083 SCTP_TSN_MAP_INITIAL,
1084 stsn, GFP_ATOMIC);
1085
1086 /* Clean up sacked and abandoned queues only. As the
1087 * out_chunk_list may not be empty, splice it to temp,
1088 * then get it back after sctp_outq_free is done.
1089 */
1090 list_splice_init(&asoc->outqueue.out_chunk_list, &temp);
1091 sctp_outq_free(&asoc->outqueue);
1092 list_splice_init(&temp, &asoc->outqueue.out_chunk_list);
1093
1094 asoc->next_tsn = rtsn;
1095 asoc->ctsn_ack_point = asoc->next_tsn - 1;
1096 asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
1097
1098 for (i = 0; i < stream->outcnt; i++) {
1099 SCTP_SO(stream, i)->mid = 0;
1100 SCTP_SO(stream, i)->mid_uo = 0;
1101 }
1102 for (i = 0; i < stream->incnt; i++)
1103 SCTP_SI(stream, i)->mid = 0;
1104 }
1105
1106 for (i = 0; i < stream->outcnt; i++)
1107 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
1108
1109 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, flags,
1110 stsn, rtsn, GFP_ATOMIC);
1111 } else if (req->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) {
1112 struct sctp_strreset_addstrm *addstrm;
1113 __u16 number;
1114
1115 addstrm = (struct sctp_strreset_addstrm *)req;
1116 nums = ntohs(addstrm->number_of_streams);
1117 number = stream->outcnt - nums;
1118
1119 if (result == SCTP_STRRESET_PERFORMED)
1120 for (i = number; i < stream->outcnt; i++)
1121 SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
1122 else
1123 stream->outcnt = number;
1124
1125 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1126 0, nums, GFP_ATOMIC);
1127 } else if (req->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) {
1128 struct sctp_strreset_addstrm *addstrm;
1129
1130 /* if the result is performed, it's impossible for addstrm in
1131 * request.
1132 */
1133 if (result == SCTP_STRRESET_PERFORMED)
1134 return NULL;
1135
1136 addstrm = (struct sctp_strreset_addstrm *)req;
1137 nums = ntohs(addstrm->number_of_streams);
1138
1139 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags,
1140 nums, 0, GFP_ATOMIC);
1141 }
1142
1143 asoc->strreset_outstanding--;
1144 asoc->strreset_outseq++;
1145
1146 /* remove everything for this reconf request */
1147 if (!asoc->strreset_outstanding) {
1148 t = asoc->strreset_chunk->transport;
1149 if (del_timer(&t->reconf_timer))
1150 sctp_transport_put(t);
1151
1152 sctp_chunk_put(asoc->strreset_chunk);
1153 asoc->strreset_chunk = NULL;
1154 }
1155
1156 return NULL;
1157 }
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