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1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* SCTP kernel implementation
3 * (C) Copyright Red Hat Inc. 2017
4 *
5 * This file is part of the SCTP kernel implementation
6 *
7 * These functions implement sctp stream message interleaving, mostly
8 * including I-DATA and I-FORWARD-TSN chunks process.
9 *
10 * Please send any bug reports or fixes you make to the
11 * email addresched(es):
12 * lksctp developers <linux-sctp@vger.kernel.org>
13 *
14 * Written or modified by:
15 * Xin Long <lucien.xin@gmail.com>
16 */
17
18 #include <net/busy_poll.h>
19 #include <net/sctp/sctp.h>
20 #include <net/sctp/sm.h>
21 #include <net/sctp/ulpevent.h>
22 #include <linux/sctp.h>
23
24 static struct sctp_chunk *sctp_make_idatafrag_empty(
25 const struct sctp_association *asoc,
26 const struct sctp_sndrcvinfo *sinfo,
27 int len, __u8 flags, gfp_t gfp)
28 {
29 struct sctp_chunk *retval;
30 struct sctp_idatahdr dp;
31
32 memset(&dp, 0, sizeof(dp));
33 dp.stream = htons(sinfo->sinfo_stream);
34
35 if (sinfo->sinfo_flags & SCTP_UNORDERED)
36 flags |= SCTP_DATA_UNORDERED;
37
38 retval = sctp_make_idata(asoc, flags, sizeof(dp) + len, gfp);
39 if (!retval)
40 return NULL;
41
42 retval->subh.idata_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
43 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
44
45 return retval;
46 }
47
48 static void sctp_chunk_assign_mid(struct sctp_chunk *chunk)
49 {
50 struct sctp_stream *stream;
51 struct sctp_chunk *lchunk;
52 __u32 cfsn = 0;
53 __u16 sid;
54
55 if (chunk->has_mid)
56 return;
57
58 sid = sctp_chunk_stream_no(chunk);
59 stream = &chunk->asoc->stream;
60
61 list_for_each_entry(lchunk, &chunk->msg->chunks, frag_list) {
62 struct sctp_idatahdr *hdr;
63 __u32 mid;
64
65 lchunk->has_mid = 1;
66
67 hdr = lchunk->subh.idata_hdr;
68
69 if (lchunk->chunk_hdr->flags & SCTP_DATA_FIRST_FRAG)
70 hdr->ppid = lchunk->sinfo.sinfo_ppid;
71 else
72 hdr->fsn = htonl(cfsn++);
73
74 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
75 mid = lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG ?
76 sctp_mid_uo_next(stream, out, sid) :
77 sctp_mid_uo_peek(stream, out, sid);
78 } else {
79 mid = lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG ?
80 sctp_mid_next(stream, out, sid) :
81 sctp_mid_peek(stream, out, sid);
82 }
83 hdr->mid = htonl(mid);
84 }
85 }
86
87 static bool sctp_validate_data(struct sctp_chunk *chunk)
88 {
89 struct sctp_stream *stream;
90 __u16 sid, ssn;
91
92 if (chunk->chunk_hdr->type != SCTP_CID_DATA)
93 return false;
94
95 if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
96 return true;
97
98 stream = &chunk->asoc->stream;
99 sid = sctp_chunk_stream_no(chunk);
100 ssn = ntohs(chunk->subh.data_hdr->ssn);
101
102 return !SSN_lt(ssn, sctp_ssn_peek(stream, in, sid));
103 }
104
105 static bool sctp_validate_idata(struct sctp_chunk *chunk)
106 {
107 struct sctp_stream *stream;
108 __u32 mid;
109 __u16 sid;
110
111 if (chunk->chunk_hdr->type != SCTP_CID_I_DATA)
112 return false;
113
114 if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
115 return true;
116
117 stream = &chunk->asoc->stream;
118 sid = sctp_chunk_stream_no(chunk);
119 mid = ntohl(chunk->subh.idata_hdr->mid);
120
121 return !MID_lt(mid, sctp_mid_peek(stream, in, sid));
122 }
123
124 static void sctp_intl_store_reasm(struct sctp_ulpq *ulpq,
125 struct sctp_ulpevent *event)
126 {
127 struct sctp_ulpevent *cevent;
128 struct sk_buff *pos, *loc;
129
130 pos = skb_peek_tail(&ulpq->reasm);
131 if (!pos) {
132 __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event));
133 return;
134 }
135
136 cevent = sctp_skb2event(pos);
137
138 if (event->stream == cevent->stream &&
139 event->mid == cevent->mid &&
140 (cevent->msg_flags & SCTP_DATA_FIRST_FRAG ||
141 (!(event->msg_flags & SCTP_DATA_FIRST_FRAG) &&
142 event->fsn > cevent->fsn))) {
143 __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event));
144 return;
145 }
146
147 if ((event->stream == cevent->stream &&
148 MID_lt(cevent->mid, event->mid)) ||
149 event->stream > cevent->stream) {
150 __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event));
151 return;
152 }
153
154 loc = NULL;
155 skb_queue_walk(&ulpq->reasm, pos) {
156 cevent = sctp_skb2event(pos);
157
158 if (event->stream < cevent->stream ||
159 (event->stream == cevent->stream &&
160 MID_lt(event->mid, cevent->mid))) {
161 loc = pos;
162 break;
163 }
164 if (event->stream == cevent->stream &&
165 event->mid == cevent->mid &&
166 !(cevent->msg_flags & SCTP_DATA_FIRST_FRAG) &&
167 (event->msg_flags & SCTP_DATA_FIRST_FRAG ||
168 event->fsn < cevent->fsn)) {
169 loc = pos;
170 break;
171 }
172 }
173
174 if (!loc)
175 __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event));
176 else
177 __skb_queue_before(&ulpq->reasm, loc, sctp_event2skb(event));
178 }
179
180 static struct sctp_ulpevent *sctp_intl_retrieve_partial(
181 struct sctp_ulpq *ulpq,
182 struct sctp_ulpevent *event)
183 {
184 struct sk_buff *first_frag = NULL;
185 struct sk_buff *last_frag = NULL;
186 struct sctp_ulpevent *retval;
187 struct sctp_stream_in *sin;
188 struct sk_buff *pos;
189 __u32 next_fsn = 0;
190 int is_last = 0;
191
192 sin = sctp_stream_in(&ulpq->asoc->stream, event->stream);
193
194 skb_queue_walk(&ulpq->reasm, pos) {
195 struct sctp_ulpevent *cevent = sctp_skb2event(pos);
196
197 if (cevent->stream < event->stream)
198 continue;
199
200 if (cevent->stream > event->stream ||
201 cevent->mid != sin->mid)
202 break;
203
204 switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
205 case SCTP_DATA_FIRST_FRAG:
206 goto out;
207 case SCTP_DATA_MIDDLE_FRAG:
208 if (!first_frag) {
209 if (cevent->fsn == sin->fsn) {
210 first_frag = pos;
211 last_frag = pos;
212 next_fsn = cevent->fsn + 1;
213 }
214 } else if (cevent->fsn == next_fsn) {
215 last_frag = pos;
216 next_fsn++;
217 } else {
218 goto out;
219 }
220 break;
221 case SCTP_DATA_LAST_FRAG:
222 if (!first_frag) {
223 if (cevent->fsn == sin->fsn) {
224 first_frag = pos;
225 last_frag = pos;
226 next_fsn = 0;
227 is_last = 1;
228 }
229 } else if (cevent->fsn == next_fsn) {
230 last_frag = pos;
231 next_fsn = 0;
232 is_last = 1;
233 }
234 goto out;
235 default:
236 goto out;
237 }
238 }
239
240 out:
241 if (!first_frag)
242 return NULL;
243
244 retval = sctp_make_reassembled_event(ulpq->asoc->base.net, &ulpq->reasm,
245 first_frag, last_frag);
246 if (retval) {
247 sin->fsn = next_fsn;
248 if (is_last) {
249 retval->msg_flags |= MSG_EOR;
250 sin->pd_mode = 0;
251 }
252 }
253
254 return retval;
255 }
256
257 static struct sctp_ulpevent *sctp_intl_retrieve_reassembled(
258 struct sctp_ulpq *ulpq,
259 struct sctp_ulpevent *event)
260 {
261 struct sctp_association *asoc = ulpq->asoc;
262 struct sk_buff *pos, *first_frag = NULL;
263 struct sctp_ulpevent *retval = NULL;
264 struct sk_buff *pd_first = NULL;
265 struct sk_buff *pd_last = NULL;
266 struct sctp_stream_in *sin;
267 __u32 next_fsn = 0;
268 __u32 pd_point = 0;
269 __u32 pd_len = 0;
270 __u32 mid = 0;
271
272 sin = sctp_stream_in(&ulpq->asoc->stream, event->stream);
273
274 skb_queue_walk(&ulpq->reasm, pos) {
275 struct sctp_ulpevent *cevent = sctp_skb2event(pos);
276
277 if (cevent->stream < event->stream)
278 continue;
279 if (cevent->stream > event->stream)
280 break;
281
282 if (MID_lt(cevent->mid, event->mid))
283 continue;
284 if (MID_lt(event->mid, cevent->mid))
285 break;
286
287 switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
288 case SCTP_DATA_FIRST_FRAG:
289 if (cevent->mid == sin->mid) {
290 pd_first = pos;
291 pd_last = pos;
292 pd_len = pos->len;
293 }
294
295 first_frag = pos;
296 next_fsn = 0;
297 mid = cevent->mid;
298 break;
299
300 case SCTP_DATA_MIDDLE_FRAG:
301 if (first_frag && cevent->mid == mid &&
302 cevent->fsn == next_fsn) {
303 next_fsn++;
304 if (pd_first) {
305 pd_last = pos;
306 pd_len += pos->len;
307 }
308 } else {
309 first_frag = NULL;
310 }
311 break;
312
313 case SCTP_DATA_LAST_FRAG:
314 if (first_frag && cevent->mid == mid &&
315 cevent->fsn == next_fsn)
316 goto found;
317 else
318 first_frag = NULL;
319 break;
320 }
321 }
322
323 if (!pd_first)
324 goto out;
325
326 pd_point = sctp_sk(asoc->base.sk)->pd_point;
327 if (pd_point && pd_point <= pd_len) {
328 retval = sctp_make_reassembled_event(asoc->base.net,
329 &ulpq->reasm,
330 pd_first, pd_last);
331 if (retval) {
332 sin->fsn = next_fsn;
333 sin->pd_mode = 1;
334 }
335 }
336 goto out;
337
338 found:
339 retval = sctp_make_reassembled_event(asoc->base.net, &ulpq->reasm,
340 first_frag, pos);
341 if (retval)
342 retval->msg_flags |= MSG_EOR;
343
344 out:
345 return retval;
346 }
347
348 static struct sctp_ulpevent *sctp_intl_reasm(struct sctp_ulpq *ulpq,
349 struct sctp_ulpevent *event)
350 {
351 struct sctp_ulpevent *retval = NULL;
352 struct sctp_stream_in *sin;
353
354 if (SCTP_DATA_NOT_FRAG == (event->msg_flags & SCTP_DATA_FRAG_MASK)) {
355 event->msg_flags |= MSG_EOR;
356 return event;
357 }
358
359 sctp_intl_store_reasm(ulpq, event);
360
361 sin = sctp_stream_in(&ulpq->asoc->stream, event->stream);
362 if (sin->pd_mode && event->mid == sin->mid &&
363 event->fsn == sin->fsn)
364 retval = sctp_intl_retrieve_partial(ulpq, event);
365
366 if (!retval)
367 retval = sctp_intl_retrieve_reassembled(ulpq, event);
368
369 return retval;
370 }
371
372 static void sctp_intl_store_ordered(struct sctp_ulpq *ulpq,
373 struct sctp_ulpevent *event)
374 {
375 struct sctp_ulpevent *cevent;
376 struct sk_buff *pos, *loc;
377
378 pos = skb_peek_tail(&ulpq->lobby);
379 if (!pos) {
380 __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
381 return;
382 }
383
384 cevent = (struct sctp_ulpevent *)pos->cb;
385 if (event->stream == cevent->stream &&
386 MID_lt(cevent->mid, event->mid)) {
387 __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
388 return;
389 }
390
391 if (event->stream > cevent->stream) {
392 __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
393 return;
394 }
395
396 loc = NULL;
397 skb_queue_walk(&ulpq->lobby, pos) {
398 cevent = (struct sctp_ulpevent *)pos->cb;
399
400 if (cevent->stream > event->stream) {
401 loc = pos;
402 break;
403 }
404 if (cevent->stream == event->stream &&
405 MID_lt(event->mid, cevent->mid)) {
406 loc = pos;
407 break;
408 }
409 }
410
411 if (!loc)
412 __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
413 else
414 __skb_queue_before(&ulpq->lobby, loc, sctp_event2skb(event));
415 }
416
417 static void sctp_intl_retrieve_ordered(struct sctp_ulpq *ulpq,
418 struct sctp_ulpevent *event)
419 {
420 struct sk_buff_head *event_list;
421 struct sctp_stream *stream;
422 struct sk_buff *pos, *tmp;
423 __u16 sid = event->stream;
424
425 stream = &ulpq->asoc->stream;
426 event_list = (struct sk_buff_head *)sctp_event2skb(event)->prev;
427
428 sctp_skb_for_each(pos, &ulpq->lobby, tmp) {
429 struct sctp_ulpevent *cevent = (struct sctp_ulpevent *)pos->cb;
430
431 if (cevent->stream > sid)
432 break;
433
434 if (cevent->stream < sid)
435 continue;
436
437 if (cevent->mid != sctp_mid_peek(stream, in, sid))
438 break;
439
440 sctp_mid_next(stream, in, sid);
441
442 __skb_unlink(pos, &ulpq->lobby);
443
444 __skb_queue_tail(event_list, pos);
445 }
446 }
447
448 static struct sctp_ulpevent *sctp_intl_order(struct sctp_ulpq *ulpq,
449 struct sctp_ulpevent *event)
450 {
451 struct sctp_stream *stream;
452 __u16 sid;
453
454 stream = &ulpq->asoc->stream;
455 sid = event->stream;
456
457 if (event->mid != sctp_mid_peek(stream, in, sid)) {
458 sctp_intl_store_ordered(ulpq, event);
459 return NULL;
460 }
461
462 sctp_mid_next(stream, in, sid);
463
464 sctp_intl_retrieve_ordered(ulpq, event);
465
466 return event;
467 }
468
469 static int sctp_enqueue_event(struct sctp_ulpq *ulpq,
470 struct sk_buff_head *skb_list)
471 {
472 struct sock *sk = ulpq->asoc->base.sk;
473 struct sctp_sock *sp = sctp_sk(sk);
474 struct sctp_ulpevent *event;
475 struct sk_buff *skb;
476
477 skb = __skb_peek(skb_list);
478 event = sctp_skb2event(skb);
479
480 if (sk->sk_shutdown & RCV_SHUTDOWN &&
481 (sk->sk_shutdown & SEND_SHUTDOWN ||
482 !sctp_ulpevent_is_notification(event)))
483 goto out_free;
484
485 if (!sctp_ulpevent_is_notification(event)) {
486 sk_mark_napi_id(sk, skb);
487 sk_incoming_cpu_update(sk);
488 }
489
490 if (!sctp_ulpevent_is_enabled(event, ulpq->asoc->subscribe))
491 goto out_free;
492
493 if (skb_list)
494 skb_queue_splice_tail_init(skb_list,
495 &sk->sk_receive_queue);
496 else
497 __skb_queue_tail(&sk->sk_receive_queue, skb);
498
499 if (!sp->data_ready_signalled) {
500 sp->data_ready_signalled = 1;
501 sk->sk_data_ready(sk);
502 }
503
504 return 1;
505
506 out_free:
507 if (skb_list)
508 sctp_queue_purge_ulpevents(skb_list);
509 else
510 sctp_ulpevent_free(event);
511
512 return 0;
513 }
514
515 static void sctp_intl_store_reasm_uo(struct sctp_ulpq *ulpq,
516 struct sctp_ulpevent *event)
517 {
518 struct sctp_ulpevent *cevent;
519 struct sk_buff *pos;
520
521 pos = skb_peek_tail(&ulpq->reasm_uo);
522 if (!pos) {
523 __skb_queue_tail(&ulpq->reasm_uo, sctp_event2skb(event));
524 return;
525 }
526
527 cevent = sctp_skb2event(pos);
528
529 if (event->stream == cevent->stream &&
530 event->mid == cevent->mid &&
531 (cevent->msg_flags & SCTP_DATA_FIRST_FRAG ||
532 (!(event->msg_flags & SCTP_DATA_FIRST_FRAG) &&
533 event->fsn > cevent->fsn))) {
534 __skb_queue_tail(&ulpq->reasm_uo, sctp_event2skb(event));
535 return;
536 }
537
538 if ((event->stream == cevent->stream &&
539 MID_lt(cevent->mid, event->mid)) ||
540 event->stream > cevent->stream) {
541 __skb_queue_tail(&ulpq->reasm_uo, sctp_event2skb(event));
542 return;
543 }
544
545 skb_queue_walk(&ulpq->reasm_uo, pos) {
546 cevent = sctp_skb2event(pos);
547
548 if (event->stream < cevent->stream ||
549 (event->stream == cevent->stream &&
550 MID_lt(event->mid, cevent->mid)))
551 break;
552
553 if (event->stream == cevent->stream &&
554 event->mid == cevent->mid &&
555 !(cevent->msg_flags & SCTP_DATA_FIRST_FRAG) &&
556 (event->msg_flags & SCTP_DATA_FIRST_FRAG ||
557 event->fsn < cevent->fsn))
558 break;
559 }
560
561 __skb_queue_before(&ulpq->reasm_uo, pos, sctp_event2skb(event));
562 }
563
564 static struct sctp_ulpevent *sctp_intl_retrieve_partial_uo(
565 struct sctp_ulpq *ulpq,
566 struct sctp_ulpevent *event)
567 {
568 struct sk_buff *first_frag = NULL;
569 struct sk_buff *last_frag = NULL;
570 struct sctp_ulpevent *retval;
571 struct sctp_stream_in *sin;
572 struct sk_buff *pos;
573 __u32 next_fsn = 0;
574 int is_last = 0;
575
576 sin = sctp_stream_in(&ulpq->asoc->stream, event->stream);
577
578 skb_queue_walk(&ulpq->reasm_uo, pos) {
579 struct sctp_ulpevent *cevent = sctp_skb2event(pos);
580
581 if (cevent->stream < event->stream)
582 continue;
583 if (cevent->stream > event->stream)
584 break;
585
586 if (MID_lt(cevent->mid, sin->mid_uo))
587 continue;
588 if (MID_lt(sin->mid_uo, cevent->mid))
589 break;
590
591 switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
592 case SCTP_DATA_FIRST_FRAG:
593 goto out;
594 case SCTP_DATA_MIDDLE_FRAG:
595 if (!first_frag) {
596 if (cevent->fsn == sin->fsn_uo) {
597 first_frag = pos;
598 last_frag = pos;
599 next_fsn = cevent->fsn + 1;
600 }
601 } else if (cevent->fsn == next_fsn) {
602 last_frag = pos;
603 next_fsn++;
604 } else {
605 goto out;
606 }
607 break;
608 case SCTP_DATA_LAST_FRAG:
609 if (!first_frag) {
610 if (cevent->fsn == sin->fsn_uo) {
611 first_frag = pos;
612 last_frag = pos;
613 next_fsn = 0;
614 is_last = 1;
615 }
616 } else if (cevent->fsn == next_fsn) {
617 last_frag = pos;
618 next_fsn = 0;
619 is_last = 1;
620 }
621 goto out;
622 default:
623 goto out;
624 }
625 }
626
627 out:
628 if (!first_frag)
629 return NULL;
630
631 retval = sctp_make_reassembled_event(ulpq->asoc->base.net,
632 &ulpq->reasm_uo, first_frag,
633 last_frag);
634 if (retval) {
635 sin->fsn_uo = next_fsn;
636 if (is_last) {
637 retval->msg_flags |= MSG_EOR;
638 sin->pd_mode_uo = 0;
639 }
640 }
641
642 return retval;
643 }
644
645 static struct sctp_ulpevent *sctp_intl_retrieve_reassembled_uo(
646 struct sctp_ulpq *ulpq,
647 struct sctp_ulpevent *event)
648 {
649 struct sctp_association *asoc = ulpq->asoc;
650 struct sk_buff *pos, *first_frag = NULL;
651 struct sctp_ulpevent *retval = NULL;
652 struct sk_buff *pd_first = NULL;
653 struct sk_buff *pd_last = NULL;
654 struct sctp_stream_in *sin;
655 __u32 next_fsn = 0;
656 __u32 pd_point = 0;
657 __u32 pd_len = 0;
658 __u32 mid = 0;
659
660 sin = sctp_stream_in(&ulpq->asoc->stream, event->stream);
661
662 skb_queue_walk(&ulpq->reasm_uo, pos) {
663 struct sctp_ulpevent *cevent = sctp_skb2event(pos);
664
665 if (cevent->stream < event->stream)
666 continue;
667 if (cevent->stream > event->stream)
668 break;
669
670 if (MID_lt(cevent->mid, event->mid))
671 continue;
672 if (MID_lt(event->mid, cevent->mid))
673 break;
674
675 switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
676 case SCTP_DATA_FIRST_FRAG:
677 if (!sin->pd_mode_uo) {
678 sin->mid_uo = cevent->mid;
679 pd_first = pos;
680 pd_last = pos;
681 pd_len = pos->len;
682 }
683
684 first_frag = pos;
685 next_fsn = 0;
686 mid = cevent->mid;
687 break;
688
689 case SCTP_DATA_MIDDLE_FRAG:
690 if (first_frag && cevent->mid == mid &&
691 cevent->fsn == next_fsn) {
692 next_fsn++;
693 if (pd_first) {
694 pd_last = pos;
695 pd_len += pos->len;
696 }
697 } else {
698 first_frag = NULL;
699 }
700 break;
701
702 case SCTP_DATA_LAST_FRAG:
703 if (first_frag && cevent->mid == mid &&
704 cevent->fsn == next_fsn)
705 goto found;
706 else
707 first_frag = NULL;
708 break;
709 }
710 }
711
712 if (!pd_first)
713 goto out;
714
715 pd_point = sctp_sk(asoc->base.sk)->pd_point;
716 if (pd_point && pd_point <= pd_len) {
717 retval = sctp_make_reassembled_event(asoc->base.net,
718 &ulpq->reasm_uo,
719 pd_first, pd_last);
720 if (retval) {
721 sin->fsn_uo = next_fsn;
722 sin->pd_mode_uo = 1;
723 }
724 }
725 goto out;
726
727 found:
728 retval = sctp_make_reassembled_event(asoc->base.net, &ulpq->reasm_uo,
729 first_frag, pos);
730 if (retval)
731 retval->msg_flags |= MSG_EOR;
732
733 out:
734 return retval;
735 }
736
737 static struct sctp_ulpevent *sctp_intl_reasm_uo(struct sctp_ulpq *ulpq,
738 struct sctp_ulpevent *event)
739 {
740 struct sctp_ulpevent *retval = NULL;
741 struct sctp_stream_in *sin;
742
743 if (SCTP_DATA_NOT_FRAG == (event->msg_flags & SCTP_DATA_FRAG_MASK)) {
744 event->msg_flags |= MSG_EOR;
745 return event;
746 }
747
748 sctp_intl_store_reasm_uo(ulpq, event);
749
750 sin = sctp_stream_in(&ulpq->asoc->stream, event->stream);
751 if (sin->pd_mode_uo && event->mid == sin->mid_uo &&
752 event->fsn == sin->fsn_uo)
753 retval = sctp_intl_retrieve_partial_uo(ulpq, event);
754
755 if (!retval)
756 retval = sctp_intl_retrieve_reassembled_uo(ulpq, event);
757
758 return retval;
759 }
760
761 static struct sctp_ulpevent *sctp_intl_retrieve_first_uo(struct sctp_ulpq *ulpq)
762 {
763 struct sctp_stream_in *csin, *sin = NULL;
764 struct sk_buff *first_frag = NULL;
765 struct sk_buff *last_frag = NULL;
766 struct sctp_ulpevent *retval;
767 struct sk_buff *pos;
768 __u32 next_fsn = 0;
769 __u16 sid = 0;
770
771 skb_queue_walk(&ulpq->reasm_uo, pos) {
772 struct sctp_ulpevent *cevent = sctp_skb2event(pos);
773
774 csin = sctp_stream_in(&ulpq->asoc->stream, cevent->stream);
775 if (csin->pd_mode_uo)
776 continue;
777
778 switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
779 case SCTP_DATA_FIRST_FRAG:
780 if (first_frag)
781 goto out;
782 first_frag = pos;
783 last_frag = pos;
784 next_fsn = 0;
785 sin = csin;
786 sid = cevent->stream;
787 sin->mid_uo = cevent->mid;
788 break;
789 case SCTP_DATA_MIDDLE_FRAG:
790 if (!first_frag)
791 break;
792 if (cevent->stream == sid &&
793 cevent->mid == sin->mid_uo &&
794 cevent->fsn == next_fsn) {
795 next_fsn++;
796 last_frag = pos;
797 } else {
798 goto out;
799 }
800 break;
801 case SCTP_DATA_LAST_FRAG:
802 if (first_frag)
803 goto out;
804 break;
805 default:
806 break;
807 }
808 }
809
810 if (!first_frag)
811 return NULL;
812
813 out:
814 retval = sctp_make_reassembled_event(ulpq->asoc->base.net,
815 &ulpq->reasm_uo, first_frag,
816 last_frag);
817 if (retval) {
818 sin->fsn_uo = next_fsn;
819 sin->pd_mode_uo = 1;
820 }
821
822 return retval;
823 }
824
825 static int sctp_ulpevent_idata(struct sctp_ulpq *ulpq,
826 struct sctp_chunk *chunk, gfp_t gfp)
827 {
828 struct sctp_ulpevent *event;
829 struct sk_buff_head temp;
830 int event_eor = 0;
831
832 event = sctp_ulpevent_make_rcvmsg(chunk->asoc, chunk, gfp);
833 if (!event)
834 return -ENOMEM;
835
836 event->mid = ntohl(chunk->subh.idata_hdr->mid);
837 if (event->msg_flags & SCTP_DATA_FIRST_FRAG)
838 event->ppid = chunk->subh.idata_hdr->ppid;
839 else
840 event->fsn = ntohl(chunk->subh.idata_hdr->fsn);
841
842 if (!(event->msg_flags & SCTP_DATA_UNORDERED)) {
843 event = sctp_intl_reasm(ulpq, event);
844 if (event) {
845 skb_queue_head_init(&temp);
846 __skb_queue_tail(&temp, sctp_event2skb(event));
847
848 if (event->msg_flags & MSG_EOR)
849 event = sctp_intl_order(ulpq, event);
850 }
851 } else {
852 event = sctp_intl_reasm_uo(ulpq, event);
853 if (event) {
854 skb_queue_head_init(&temp);
855 __skb_queue_tail(&temp, sctp_event2skb(event));
856 }
857 }
858
859 if (event) {
860 event_eor = (event->msg_flags & MSG_EOR) ? 1 : 0;
861 sctp_enqueue_event(ulpq, &temp);
862 }
863
864 return event_eor;
865 }
866
867 static struct sctp_ulpevent *sctp_intl_retrieve_first(struct sctp_ulpq *ulpq)
868 {
869 struct sctp_stream_in *csin, *sin = NULL;
870 struct sk_buff *first_frag = NULL;
871 struct sk_buff *last_frag = NULL;
872 struct sctp_ulpevent *retval;
873 struct sk_buff *pos;
874 __u32 next_fsn = 0;
875 __u16 sid = 0;
876
877 skb_queue_walk(&ulpq->reasm, pos) {
878 struct sctp_ulpevent *cevent = sctp_skb2event(pos);
879
880 csin = sctp_stream_in(&ulpq->asoc->stream, cevent->stream);
881 if (csin->pd_mode)
882 continue;
883
884 switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
885 case SCTP_DATA_FIRST_FRAG:
886 if (first_frag)
887 goto out;
888 if (cevent->mid == csin->mid) {
889 first_frag = pos;
890 last_frag = pos;
891 next_fsn = 0;
892 sin = csin;
893 sid = cevent->stream;
894 }
895 break;
896 case SCTP_DATA_MIDDLE_FRAG:
897 if (!first_frag)
898 break;
899 if (cevent->stream == sid &&
900 cevent->mid == sin->mid &&
901 cevent->fsn == next_fsn) {
902 next_fsn++;
903 last_frag = pos;
904 } else {
905 goto out;
906 }
907 break;
908 case SCTP_DATA_LAST_FRAG:
909 if (first_frag)
910 goto out;
911 break;
912 default:
913 break;
914 }
915 }
916
917 if (!first_frag)
918 return NULL;
919
920 out:
921 retval = sctp_make_reassembled_event(ulpq->asoc->base.net,
922 &ulpq->reasm, first_frag,
923 last_frag);
924 if (retval) {
925 sin->fsn = next_fsn;
926 sin->pd_mode = 1;
927 }
928
929 return retval;
930 }
931
932 static void sctp_intl_start_pd(struct sctp_ulpq *ulpq, gfp_t gfp)
933 {
934 struct sctp_ulpevent *event;
935 struct sk_buff_head temp;
936
937 if (!skb_queue_empty(&ulpq->reasm)) {
938 do {
939 event = sctp_intl_retrieve_first(ulpq);
940 if (event) {
941 skb_queue_head_init(&temp);
942 __skb_queue_tail(&temp, sctp_event2skb(event));
943 sctp_enqueue_event(ulpq, &temp);
944 }
945 } while (event);
946 }
947
948 if (!skb_queue_empty(&ulpq->reasm_uo)) {
949 do {
950 event = sctp_intl_retrieve_first_uo(ulpq);
951 if (event) {
952 skb_queue_head_init(&temp);
953 __skb_queue_tail(&temp, sctp_event2skb(event));
954 sctp_enqueue_event(ulpq, &temp);
955 }
956 } while (event);
957 }
958 }
959
960 static void sctp_renege_events(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk,
961 gfp_t gfp)
962 {
963 struct sctp_association *asoc = ulpq->asoc;
964 __u32 freed = 0;
965 __u16 needed;
966
967 needed = ntohs(chunk->chunk_hdr->length) -
968 sizeof(struct sctp_idata_chunk);
969
970 if (skb_queue_empty(&asoc->base.sk->sk_receive_queue)) {
971 freed = sctp_ulpq_renege_list(ulpq, &ulpq->lobby, needed);
972 if (freed < needed)
973 freed += sctp_ulpq_renege_list(ulpq, &ulpq->reasm,
974 needed);
975 if (freed < needed)
976 freed += sctp_ulpq_renege_list(ulpq, &ulpq->reasm_uo,
977 needed);
978 }
979
980 if (freed >= needed && sctp_ulpevent_idata(ulpq, chunk, gfp) <= 0)
981 sctp_intl_start_pd(ulpq, gfp);
982
983 sk_mem_reclaim(asoc->base.sk);
984 }
985
986 static void sctp_intl_stream_abort_pd(struct sctp_ulpq *ulpq, __u16 sid,
987 __u32 mid, __u16 flags, gfp_t gfp)
988 {
989 struct sock *sk = ulpq->asoc->base.sk;
990 struct sctp_ulpevent *ev = NULL;
991
992 if (!sctp_ulpevent_type_enabled(ulpq->asoc->subscribe,
993 SCTP_PARTIAL_DELIVERY_EVENT))
994 return;
995
996 ev = sctp_ulpevent_make_pdapi(ulpq->asoc, SCTP_PARTIAL_DELIVERY_ABORTED,
997 sid, mid, flags, gfp);
998 if (ev) {
999 struct sctp_sock *sp = sctp_sk(sk);
1000
1001 __skb_queue_tail(&sk->sk_receive_queue, sctp_event2skb(ev));
1002
1003 if (!sp->data_ready_signalled) {
1004 sp->data_ready_signalled = 1;
1005 sk->sk_data_ready(sk);
1006 }
1007 }
1008 }
1009
1010 static void sctp_intl_reap_ordered(struct sctp_ulpq *ulpq, __u16 sid)
1011 {
1012 struct sctp_stream *stream = &ulpq->asoc->stream;
1013 struct sctp_ulpevent *cevent, *event = NULL;
1014 struct sk_buff_head *lobby = &ulpq->lobby;
1015 struct sk_buff *pos, *tmp;
1016 struct sk_buff_head temp;
1017 __u16 csid;
1018 __u32 cmid;
1019
1020 skb_queue_head_init(&temp);
1021 sctp_skb_for_each(pos, lobby, tmp) {
1022 cevent = (struct sctp_ulpevent *)pos->cb;
1023 csid = cevent->stream;
1024 cmid = cevent->mid;
1025
1026 if (csid > sid)
1027 break;
1028
1029 if (csid < sid)
1030 continue;
1031
1032 if (!MID_lt(cmid, sctp_mid_peek(stream, in, csid)))
1033 break;
1034
1035 __skb_unlink(pos, lobby);
1036 if (!event)
1037 event = sctp_skb2event(pos);
1038
1039 __skb_queue_tail(&temp, pos);
1040 }
1041
1042 if (!event && pos != (struct sk_buff *)lobby) {
1043 cevent = (struct sctp_ulpevent *)pos->cb;
1044 csid = cevent->stream;
1045 cmid = cevent->mid;
1046
1047 if (csid == sid && cmid == sctp_mid_peek(stream, in, csid)) {
1048 sctp_mid_next(stream, in, csid);
1049 __skb_unlink(pos, lobby);
1050 __skb_queue_tail(&temp, pos);
1051 event = sctp_skb2event(pos);
1052 }
1053 }
1054
1055 if (event) {
1056 sctp_intl_retrieve_ordered(ulpq, event);
1057 sctp_enqueue_event(ulpq, &temp);
1058 }
1059 }
1060
1061 static void sctp_intl_abort_pd(struct sctp_ulpq *ulpq, gfp_t gfp)
1062 {
1063 struct sctp_stream *stream = &ulpq->asoc->stream;
1064 __u16 sid;
1065
1066 for (sid = 0; sid < stream->incnt; sid++) {
1067 struct sctp_stream_in *sin = SCTP_SI(stream, sid);
1068 __u32 mid;
1069
1070 if (sin->pd_mode_uo) {
1071 sin->pd_mode_uo = 0;
1072
1073 mid = sin->mid_uo;
1074 sctp_intl_stream_abort_pd(ulpq, sid, mid, 0x1, gfp);
1075 }
1076
1077 if (sin->pd_mode) {
1078 sin->pd_mode = 0;
1079
1080 mid = sin->mid;
1081 sctp_intl_stream_abort_pd(ulpq, sid, mid, 0, gfp);
1082 sctp_mid_skip(stream, in, sid, mid);
1083
1084 sctp_intl_reap_ordered(ulpq, sid);
1085 }
1086 }
1087
1088 /* intl abort pd happens only when all data needs to be cleaned */
1089 sctp_ulpq_flush(ulpq);
1090 }
1091
1092 static inline int sctp_get_skip_pos(struct sctp_ifwdtsn_skip *skiplist,
1093 int nskips, __be16 stream, __u8 flags)
1094 {
1095 int i;
1096
1097 for (i = 0; i < nskips; i++)
1098 if (skiplist[i].stream == stream &&
1099 skiplist[i].flags == flags)
1100 return i;
1101
1102 return i;
1103 }
1104
1105 #define SCTP_FTSN_U_BIT 0x1
1106 static void sctp_generate_iftsn(struct sctp_outq *q, __u32 ctsn)
1107 {
1108 struct sctp_ifwdtsn_skip ftsn_skip_arr[10];
1109 struct sctp_association *asoc = q->asoc;
1110 struct sctp_chunk *ftsn_chunk = NULL;
1111 struct list_head *lchunk, *temp;
1112 int nskips = 0, skip_pos;
1113 struct sctp_chunk *chunk;
1114 __u32 tsn;
1115
1116 if (!asoc->peer.prsctp_capable)
1117 return;
1118
1119 if (TSN_lt(asoc->adv_peer_ack_point, ctsn))
1120 asoc->adv_peer_ack_point = ctsn;
1121
1122 list_for_each_safe(lchunk, temp, &q->abandoned) {
1123 chunk = list_entry(lchunk, struct sctp_chunk, transmitted_list);
1124 tsn = ntohl(chunk->subh.data_hdr->tsn);
1125
1126 if (TSN_lte(tsn, ctsn)) {
1127 list_del_init(lchunk);
1128 sctp_chunk_free(chunk);
1129 } else if (TSN_lte(tsn, asoc->adv_peer_ack_point + 1)) {
1130 __be16 sid = chunk->subh.idata_hdr->stream;
1131 __be32 mid = chunk->subh.idata_hdr->mid;
1132 __u8 flags = 0;
1133
1134 if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
1135 flags |= SCTP_FTSN_U_BIT;
1136
1137 asoc->adv_peer_ack_point = tsn;
1138 skip_pos = sctp_get_skip_pos(&ftsn_skip_arr[0], nskips,
1139 sid, flags);
1140 ftsn_skip_arr[skip_pos].stream = sid;
1141 ftsn_skip_arr[skip_pos].reserved = 0;
1142 ftsn_skip_arr[skip_pos].flags = flags;
1143 ftsn_skip_arr[skip_pos].mid = mid;
1144 if (skip_pos == nskips)
1145 nskips++;
1146 if (nskips == 10)
1147 break;
1148 } else {
1149 break;
1150 }
1151 }
1152
1153 if (asoc->adv_peer_ack_point > ctsn)
1154 ftsn_chunk = sctp_make_ifwdtsn(asoc, asoc->adv_peer_ack_point,
1155 nskips, &ftsn_skip_arr[0]);
1156
1157 if (ftsn_chunk) {
1158 list_add_tail(&ftsn_chunk->list, &q->control_chunk_list);
1159 SCTP_INC_STATS(asoc->base.net, SCTP_MIB_OUTCTRLCHUNKS);
1160 }
1161 }
1162
1163 #define _sctp_walk_ifwdtsn(pos, chunk, end) \
1164 for (pos = chunk->subh.ifwdtsn_hdr->skip; \
1165 (void *)pos < (void *)chunk->subh.ifwdtsn_hdr->skip + (end); pos++)
1166
1167 #define sctp_walk_ifwdtsn(pos, ch) \
1168 _sctp_walk_ifwdtsn((pos), (ch), ntohs((ch)->chunk_hdr->length) - \
1169 sizeof(struct sctp_ifwdtsn_chunk))
1170
1171 static bool sctp_validate_fwdtsn(struct sctp_chunk *chunk)
1172 {
1173 struct sctp_fwdtsn_skip *skip;
1174 __u16 incnt;
1175
1176 if (chunk->chunk_hdr->type != SCTP_CID_FWD_TSN)
1177 return false;
1178
1179 incnt = chunk->asoc->stream.incnt;
1180 sctp_walk_fwdtsn(skip, chunk)
1181 if (ntohs(skip->stream) >= incnt)
1182 return false;
1183
1184 return true;
1185 }
1186
1187 static bool sctp_validate_iftsn(struct sctp_chunk *chunk)
1188 {
1189 struct sctp_ifwdtsn_skip *skip;
1190 __u16 incnt;
1191
1192 if (chunk->chunk_hdr->type != SCTP_CID_I_FWD_TSN)
1193 return false;
1194
1195 incnt = chunk->asoc->stream.incnt;
1196 sctp_walk_ifwdtsn(skip, chunk)
1197 if (ntohs(skip->stream) >= incnt)
1198 return false;
1199
1200 return true;
1201 }
1202
1203 static void sctp_report_fwdtsn(struct sctp_ulpq *ulpq, __u32 ftsn)
1204 {
1205 /* Move the Cumulattive TSN Ack ahead. */
1206 sctp_tsnmap_skip(&ulpq->asoc->peer.tsn_map, ftsn);
1207 /* purge the fragmentation queue */
1208 sctp_ulpq_reasm_flushtsn(ulpq, ftsn);
1209 /* Abort any in progress partial delivery. */
1210 sctp_ulpq_abort_pd(ulpq, GFP_ATOMIC);
1211 }
1212
1213 static void sctp_intl_reasm_flushtsn(struct sctp_ulpq *ulpq, __u32 ftsn)
1214 {
1215 struct sk_buff *pos, *tmp;
1216
1217 skb_queue_walk_safe(&ulpq->reasm, pos, tmp) {
1218 struct sctp_ulpevent *event = sctp_skb2event(pos);
1219 __u32 tsn = event->tsn;
1220
1221 if (TSN_lte(tsn, ftsn)) {
1222 __skb_unlink(pos, &ulpq->reasm);
1223 sctp_ulpevent_free(event);
1224 }
1225 }
1226
1227 skb_queue_walk_safe(&ulpq->reasm_uo, pos, tmp) {
1228 struct sctp_ulpevent *event = sctp_skb2event(pos);
1229 __u32 tsn = event->tsn;
1230
1231 if (TSN_lte(tsn, ftsn)) {
1232 __skb_unlink(pos, &ulpq->reasm_uo);
1233 sctp_ulpevent_free(event);
1234 }
1235 }
1236 }
1237
1238 static void sctp_report_iftsn(struct sctp_ulpq *ulpq, __u32 ftsn)
1239 {
1240 /* Move the Cumulattive TSN Ack ahead. */
1241 sctp_tsnmap_skip(&ulpq->asoc->peer.tsn_map, ftsn);
1242 /* purge the fragmentation queue */
1243 sctp_intl_reasm_flushtsn(ulpq, ftsn);
1244 /* abort only when it's for all data */
1245 if (ftsn == sctp_tsnmap_get_max_tsn_seen(&ulpq->asoc->peer.tsn_map))
1246 sctp_intl_abort_pd(ulpq, GFP_ATOMIC);
1247 }
1248
1249 static void sctp_handle_fwdtsn(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk)
1250 {
1251 struct sctp_fwdtsn_skip *skip;
1252
1253 /* Walk through all the skipped SSNs */
1254 sctp_walk_fwdtsn(skip, chunk)
1255 sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn));
1256 }
1257
1258 static void sctp_intl_skip(struct sctp_ulpq *ulpq, __u16 sid, __u32 mid,
1259 __u8 flags)
1260 {
1261 struct sctp_stream_in *sin = sctp_stream_in(&ulpq->asoc->stream, sid);
1262 struct sctp_stream *stream = &ulpq->asoc->stream;
1263
1264 if (flags & SCTP_FTSN_U_BIT) {
1265 if (sin->pd_mode_uo && MID_lt(sin->mid_uo, mid)) {
1266 sin->pd_mode_uo = 0;
1267 sctp_intl_stream_abort_pd(ulpq, sid, mid, 0x1,
1268 GFP_ATOMIC);
1269 }
1270 return;
1271 }
1272
1273 if (MID_lt(mid, sctp_mid_peek(stream, in, sid)))
1274 return;
1275
1276 if (sin->pd_mode) {
1277 sin->pd_mode = 0;
1278 sctp_intl_stream_abort_pd(ulpq, sid, mid, 0x0, GFP_ATOMIC);
1279 }
1280
1281 sctp_mid_skip(stream, in, sid, mid);
1282
1283 sctp_intl_reap_ordered(ulpq, sid);
1284 }
1285
1286 static void sctp_handle_iftsn(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk)
1287 {
1288 struct sctp_ifwdtsn_skip *skip;
1289
1290 /* Walk through all the skipped MIDs and abort stream pd if possible */
1291 sctp_walk_ifwdtsn(skip, chunk)
1292 sctp_intl_skip(ulpq, ntohs(skip->stream),
1293 ntohl(skip->mid), skip->flags);
1294 }
1295
1296 static int do_ulpq_tail_event(struct sctp_ulpq *ulpq, struct sctp_ulpevent *event)
1297 {
1298 struct sk_buff_head temp;
1299
1300 skb_queue_head_init(&temp);
1301 __skb_queue_tail(&temp, sctp_event2skb(event));
1302 return sctp_ulpq_tail_event(ulpq, &temp);
1303 }
1304
1305 static struct sctp_stream_interleave sctp_stream_interleave_0 = {
1306 .data_chunk_len = sizeof(struct sctp_data_chunk),
1307 .ftsn_chunk_len = sizeof(struct sctp_fwdtsn_chunk),
1308 /* DATA process functions */
1309 .make_datafrag = sctp_make_datafrag_empty,
1310 .assign_number = sctp_chunk_assign_ssn,
1311 .validate_data = sctp_validate_data,
1312 .ulpevent_data = sctp_ulpq_tail_data,
1313 .enqueue_event = do_ulpq_tail_event,
1314 .renege_events = sctp_ulpq_renege,
1315 .start_pd = sctp_ulpq_partial_delivery,
1316 .abort_pd = sctp_ulpq_abort_pd,
1317 /* FORWARD-TSN process functions */
1318 .generate_ftsn = sctp_generate_fwdtsn,
1319 .validate_ftsn = sctp_validate_fwdtsn,
1320 .report_ftsn = sctp_report_fwdtsn,
1321 .handle_ftsn = sctp_handle_fwdtsn,
1322 };
1323
1324 static int do_sctp_enqueue_event(struct sctp_ulpq *ulpq,
1325 struct sctp_ulpevent *event)
1326 {
1327 struct sk_buff_head temp;
1328
1329 skb_queue_head_init(&temp);
1330 __skb_queue_tail(&temp, sctp_event2skb(event));
1331 return sctp_enqueue_event(ulpq, &temp);
1332 }
1333
1334 static struct sctp_stream_interleave sctp_stream_interleave_1 = {
1335 .data_chunk_len = sizeof(struct sctp_idata_chunk),
1336 .ftsn_chunk_len = sizeof(struct sctp_ifwdtsn_chunk),
1337 /* I-DATA process functions */
1338 .make_datafrag = sctp_make_idatafrag_empty,
1339 .assign_number = sctp_chunk_assign_mid,
1340 .validate_data = sctp_validate_idata,
1341 .ulpevent_data = sctp_ulpevent_idata,
1342 .enqueue_event = do_sctp_enqueue_event,
1343 .renege_events = sctp_renege_events,
1344 .start_pd = sctp_intl_start_pd,
1345 .abort_pd = sctp_intl_abort_pd,
1346 /* I-FORWARD-TSN process functions */
1347 .generate_ftsn = sctp_generate_iftsn,
1348 .validate_ftsn = sctp_validate_iftsn,
1349 .report_ftsn = sctp_report_iftsn,
1350 .handle_ftsn = sctp_handle_iftsn,
1351 };
1352
1353 void sctp_stream_interleave_init(struct sctp_stream *stream)
1354 {
1355 struct sctp_association *asoc;
1356
1357 asoc = container_of(stream, struct sctp_association, stream);
1358 stream->si = asoc->peer.intl_capable ? &sctp_stream_interleave_1
1359 : &sctp_stream_interleave_0;
1360 }
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