1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22#include <linux/slab.h>
23#include <linux/types.h>
24#include <linux/skbuff.h>
25#include <net/sock.h>
26#include <net/busy_poll.h>
27#include <net/sctp/structs.h>
28#include <net/sctp/sctp.h>
29#include <net/sctp/sm.h>
30
31
32static struct sctp_ulpevent *sctp_ulpq_reasm(struct sctp_ulpq *ulpq,
33 struct sctp_ulpevent *);
34static struct sctp_ulpevent *sctp_ulpq_order(struct sctp_ulpq *,
35 struct sctp_ulpevent *);
36static void sctp_ulpq_reasm_drain(struct sctp_ulpq *ulpq);
37
38
39
40
41struct sctp_ulpq *sctp_ulpq_init(struct sctp_ulpq *ulpq,
42 struct sctp_association *asoc)
43{
44 memset(ulpq, 0, sizeof(struct sctp_ulpq));
45
46 ulpq->asoc = asoc;
47 skb_queue_head_init(&ulpq->reasm);
48 skb_queue_head_init(&ulpq->reasm_uo);
49 skb_queue_head_init(&ulpq->lobby);
50 ulpq->pd_mode = 0;
51
52 return ulpq;
53}
54
55
56
57void sctp_ulpq_flush(struct sctp_ulpq *ulpq)
58{
59 struct sk_buff *skb;
60 struct sctp_ulpevent *event;
61
62 while ((skb = __skb_dequeue(&ulpq->lobby)) != NULL) {
63 event = sctp_skb2event(skb);
64 sctp_ulpevent_free(event);
65 }
66
67 while ((skb = __skb_dequeue(&ulpq->reasm)) != NULL) {
68 event = sctp_skb2event(skb);
69 sctp_ulpevent_free(event);
70 }
71
72 while ((skb = __skb_dequeue(&ulpq->reasm_uo)) != NULL) {
73 event = sctp_skb2event(skb);
74 sctp_ulpevent_free(event);
75 }
76}
77
78
79void sctp_ulpq_free(struct sctp_ulpq *ulpq)
80{
81 sctp_ulpq_flush(ulpq);
82}
83
84
85int sctp_ulpq_tail_data(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk,
86 gfp_t gfp)
87{
88 struct sk_buff_head temp;
89 struct sctp_ulpevent *event;
90 int event_eor = 0;
91
92
93 event = sctp_ulpevent_make_rcvmsg(chunk->asoc, chunk, gfp);
94 if (!event)
95 return -ENOMEM;
96
97 event->ssn = ntohs(chunk->subh.data_hdr->ssn);
98 event->ppid = chunk->subh.data_hdr->ppid;
99
100
101 event = sctp_ulpq_reasm(ulpq, event);
102
103
104 if (event) {
105
106 skb_queue_head_init(&temp);
107 __skb_queue_tail(&temp, sctp_event2skb(event));
108
109 if (event->msg_flags & MSG_EOR)
110 event = sctp_ulpq_order(ulpq, event);
111 }
112
113
114
115
116 if (event) {
117 event_eor = (event->msg_flags & MSG_EOR) ? 1 : 0;
118 sctp_ulpq_tail_event(ulpq, &temp);
119 }
120
121 return event_eor;
122}
123
124
125
126
127
128int sctp_clear_pd(struct sock *sk, struct sctp_association *asoc)
129{
130 struct sctp_sock *sp = sctp_sk(sk);
131
132 if (atomic_dec_and_test(&sp->pd_mode)) {
133
134
135
136 if (!skb_queue_empty(&sp->pd_lobby)) {
137 skb_queue_splice_tail_init(&sp->pd_lobby,
138 &sk->sk_receive_queue);
139 return 1;
140 }
141 } else {
142
143
144
145
146
147 if (!skb_queue_empty(&sp->pd_lobby) && asoc) {
148 struct sk_buff *skb, *tmp;
149 struct sctp_ulpevent *event;
150
151 sctp_skb_for_each(skb, &sp->pd_lobby, tmp) {
152 event = sctp_skb2event(skb);
153 if (event->asoc == asoc) {
154 __skb_unlink(skb, &sp->pd_lobby);
155 __skb_queue_tail(&sk->sk_receive_queue,
156 skb);
157 }
158 }
159 }
160 }
161
162 return 0;
163}
164
165
166static void sctp_ulpq_set_pd(struct sctp_ulpq *ulpq)
167{
168 struct sctp_sock *sp = sctp_sk(ulpq->asoc->base.sk);
169
170 atomic_inc(&sp->pd_mode);
171 ulpq->pd_mode = 1;
172}
173
174
175static int sctp_ulpq_clear_pd(struct sctp_ulpq *ulpq)
176{
177 ulpq->pd_mode = 0;
178 sctp_ulpq_reasm_drain(ulpq);
179 return sctp_clear_pd(ulpq->asoc->base.sk, ulpq->asoc);
180}
181
182int sctp_ulpq_tail_event(struct sctp_ulpq *ulpq, struct sk_buff_head *skb_list)
183{
184 struct sock *sk = ulpq->asoc->base.sk;
185 struct sctp_sock *sp = sctp_sk(sk);
186 struct sctp_ulpevent *event;
187 struct sk_buff_head *queue;
188 struct sk_buff *skb;
189 int clear_pd = 0;
190
191 skb = __skb_peek(skb_list);
192 event = sctp_skb2event(skb);
193
194
195
196
197 if (sk->sk_shutdown & RCV_SHUTDOWN &&
198 (sk->sk_shutdown & SEND_SHUTDOWN ||
199 !sctp_ulpevent_is_notification(event)))
200 goto out_free;
201
202 if (!sctp_ulpevent_is_notification(event)) {
203 sk_mark_napi_id(sk, skb);
204 sk_incoming_cpu_update(sk);
205 }
206
207 if (!sctp_ulpevent_is_enabled(event, ulpq->asoc->subscribe))
208 goto out_free;
209
210
211
212
213
214
215 if (atomic_read(&sp->pd_mode) == 0) {
216 queue = &sk->sk_receive_queue;
217 } else {
218 if (ulpq->pd_mode) {
219
220
221
222
223
224 if ((event->msg_flags & MSG_NOTIFICATION) ||
225 (SCTP_DATA_NOT_FRAG ==
226 (event->msg_flags & SCTP_DATA_FRAG_MASK)))
227 queue = &sp->pd_lobby;
228 else {
229 clear_pd = event->msg_flags & MSG_EOR;
230 queue = &sk->sk_receive_queue;
231 }
232 } else {
233
234
235
236
237
238 if (sp->frag_interleave)
239 queue = &sk->sk_receive_queue;
240 else
241 queue = &sp->pd_lobby;
242 }
243 }
244
245 skb_queue_splice_tail_init(skb_list, queue);
246
247
248
249
250
251 if (clear_pd)
252 sctp_ulpq_clear_pd(ulpq);
253
254 if (queue == &sk->sk_receive_queue && !sp->data_ready_signalled) {
255 if (!sock_owned_by_user(sk))
256 sp->data_ready_signalled = 1;
257 sk->sk_data_ready(sk);
258 }
259 return 1;
260
261out_free:
262 if (skb_list)
263 sctp_queue_purge_ulpevents(skb_list);
264 else
265 sctp_ulpevent_free(event);
266
267 return 0;
268}
269
270
271
272
273static void sctp_ulpq_store_reasm(struct sctp_ulpq *ulpq,
274 struct sctp_ulpevent *event)
275{
276 struct sk_buff *pos;
277 struct sctp_ulpevent *cevent;
278 __u32 tsn, ctsn;
279
280 tsn = event->tsn;
281
282
283 pos = skb_peek_tail(&ulpq->reasm);
284 if (!pos) {
285 __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event));
286 return;
287 }
288
289
290 cevent = sctp_skb2event(pos);
291 ctsn = cevent->tsn;
292 if (TSN_lt(ctsn, tsn)) {
293 __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event));
294 return;
295 }
296
297
298 skb_queue_walk(&ulpq->reasm, pos) {
299 cevent = sctp_skb2event(pos);
300 ctsn = cevent->tsn;
301
302 if (TSN_lt(tsn, ctsn))
303 break;
304 }
305
306
307 __skb_queue_before(&ulpq->reasm, pos, sctp_event2skb(event));
308
309}
310
311
312
313
314
315
316
317
318struct sctp_ulpevent *sctp_make_reassembled_event(struct net *net,
319 struct sk_buff_head *queue,
320 struct sk_buff *f_frag,
321 struct sk_buff *l_frag)
322{
323 struct sk_buff *pos;
324 struct sk_buff *new = NULL;
325 struct sctp_ulpevent *event;
326 struct sk_buff *pnext, *last;
327 struct sk_buff *list = skb_shinfo(f_frag)->frag_list;
328
329
330 if (f_frag == l_frag)
331 pos = NULL;
332 else
333 pos = f_frag->next;
334
335
336 for (last = list; list; last = list, list = list->next)
337 ;
338
339
340
341
342 if (last)
343 last->next = pos;
344 else {
345 if (skb_cloned(f_frag)) {
346
347
348
349
350
351 new = skb_copy(f_frag, GFP_ATOMIC);
352 if (!new)
353 return NULL;
354
355 sctp_skb_set_owner_r(new, f_frag->sk);
356
357 skb_shinfo(new)->frag_list = pos;
358 } else
359 skb_shinfo(f_frag)->frag_list = pos;
360 }
361
362
363 __skb_unlink(f_frag, queue);
364
365
366 if (new) {
367 kfree_skb(f_frag);
368 f_frag = new;
369 }
370
371 while (pos) {
372
373 pnext = pos->next;
374
375
376 f_frag->len += pos->len;
377 f_frag->data_len += pos->len;
378
379
380 __skb_unlink(pos, queue);
381
382
383 if (pos == l_frag)
384 break;
385 pos->next = pnext;
386 pos = pnext;
387 }
388
389 event = sctp_skb2event(f_frag);
390 SCTP_INC_STATS(net, SCTP_MIB_REASMUSRMSGS);
391
392 return event;
393}
394
395
396
397
398
399static struct sctp_ulpevent *sctp_ulpq_retrieve_reassembled(struct sctp_ulpq *ulpq)
400{
401 struct sk_buff *pos;
402 struct sctp_ulpevent *cevent;
403 struct sk_buff *first_frag = NULL;
404 __u32 ctsn, next_tsn;
405 struct sctp_ulpevent *retval = NULL;
406 struct sk_buff *pd_first = NULL;
407 struct sk_buff *pd_last = NULL;
408 size_t pd_len = 0;
409 struct sctp_association *asoc;
410 u32 pd_point;
411
412
413
414
415
416 next_tsn = 0;
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431 skb_queue_walk(&ulpq->reasm, pos) {
432 cevent = sctp_skb2event(pos);
433 ctsn = cevent->tsn;
434
435 switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
436 case SCTP_DATA_FIRST_FRAG:
437
438
439
440
441 if (skb_queue_is_first(&ulpq->reasm, pos)) {
442 pd_first = pos;
443 pd_last = pos;
444 pd_len = pos->len;
445 } else {
446 pd_first = NULL;
447 pd_last = NULL;
448 pd_len = 0;
449 }
450
451 first_frag = pos;
452 next_tsn = ctsn + 1;
453 break;
454
455 case SCTP_DATA_MIDDLE_FRAG:
456 if ((first_frag) && (ctsn == next_tsn)) {
457 next_tsn++;
458 if (pd_first) {
459 pd_last = pos;
460 pd_len += pos->len;
461 }
462 } else
463 first_frag = NULL;
464 break;
465
466 case SCTP_DATA_LAST_FRAG:
467 if (first_frag && (ctsn == next_tsn))
468 goto found;
469 else
470 first_frag = NULL;
471 break;
472 }
473 }
474
475 asoc = ulpq->asoc;
476 if (pd_first) {
477
478
479
480
481
482 if (!sctp_sk(asoc->base.sk)->frag_interleave &&
483 atomic_read(&sctp_sk(asoc->base.sk)->pd_mode))
484 goto done;
485
486 cevent = sctp_skb2event(pd_first);
487 pd_point = sctp_sk(asoc->base.sk)->pd_point;
488 if (pd_point && pd_point <= pd_len) {
489 retval = sctp_make_reassembled_event(asoc->base.net,
490 &ulpq->reasm,
491 pd_first, pd_last);
492 if (retval)
493 sctp_ulpq_set_pd(ulpq);
494 }
495 }
496done:
497 return retval;
498found:
499 retval = sctp_make_reassembled_event(ulpq->asoc->base.net,
500 &ulpq->reasm, first_frag, pos);
501 if (retval)
502 retval->msg_flags |= MSG_EOR;
503 goto done;
504}
505
506
507static struct sctp_ulpevent *sctp_ulpq_retrieve_partial(struct sctp_ulpq *ulpq)
508{
509 struct sk_buff *pos, *last_frag, *first_frag;
510 struct sctp_ulpevent *cevent;
511 __u32 ctsn, next_tsn;
512 int is_last;
513 struct sctp_ulpevent *retval;
514
515
516
517
518
519
520 if (skb_queue_empty(&ulpq->reasm))
521 return NULL;
522
523 last_frag = first_frag = NULL;
524 retval = NULL;
525 next_tsn = 0;
526 is_last = 0;
527
528 skb_queue_walk(&ulpq->reasm, pos) {
529 cevent = sctp_skb2event(pos);
530 ctsn = cevent->tsn;
531
532 switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
533 case SCTP_DATA_FIRST_FRAG:
534 if (!first_frag)
535 return NULL;
536 goto done;
537 case SCTP_DATA_MIDDLE_FRAG:
538 if (!first_frag) {
539 first_frag = pos;
540 next_tsn = ctsn + 1;
541 last_frag = pos;
542 } else if (next_tsn == ctsn) {
543 next_tsn++;
544 last_frag = pos;
545 } else
546 goto done;
547 break;
548 case SCTP_DATA_LAST_FRAG:
549 if (!first_frag)
550 first_frag = pos;
551 else if (ctsn != next_tsn)
552 goto done;
553 last_frag = pos;
554 is_last = 1;
555 goto done;
556 default:
557 return NULL;
558 }
559 }
560
561
562
563
564done:
565 retval = sctp_make_reassembled_event(ulpq->asoc->base.net, &ulpq->reasm,
566 first_frag, last_frag);
567 if (retval && is_last)
568 retval->msg_flags |= MSG_EOR;
569
570 return retval;
571}
572
573
574
575
576
577static struct sctp_ulpevent *sctp_ulpq_reasm(struct sctp_ulpq *ulpq,
578 struct sctp_ulpevent *event)
579{
580 struct sctp_ulpevent *retval = NULL;
581
582
583 if (SCTP_DATA_NOT_FRAG == (event->msg_flags & SCTP_DATA_FRAG_MASK)) {
584 event->msg_flags |= MSG_EOR;
585 return event;
586 }
587
588 sctp_ulpq_store_reasm(ulpq, event);
589 if (!ulpq->pd_mode)
590 retval = sctp_ulpq_retrieve_reassembled(ulpq);
591 else {
592 __u32 ctsn, ctsnap;
593
594
595
596
597 ctsn = event->tsn;
598 ctsnap = sctp_tsnmap_get_ctsn(&ulpq->asoc->peer.tsn_map);
599 if (TSN_lte(ctsn, ctsnap))
600 retval = sctp_ulpq_retrieve_partial(ulpq);
601 }
602
603 return retval;
604}
605
606
607static struct sctp_ulpevent *sctp_ulpq_retrieve_first(struct sctp_ulpq *ulpq)
608{
609 struct sk_buff *pos, *last_frag, *first_frag;
610 struct sctp_ulpevent *cevent;
611 __u32 ctsn, next_tsn;
612 struct sctp_ulpevent *retval;
613
614
615
616
617
618
619 if (skb_queue_empty(&ulpq->reasm))
620 return NULL;
621
622 last_frag = first_frag = NULL;
623 retval = NULL;
624 next_tsn = 0;
625
626 skb_queue_walk(&ulpq->reasm, pos) {
627 cevent = sctp_skb2event(pos);
628 ctsn = cevent->tsn;
629
630 switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
631 case SCTP_DATA_FIRST_FRAG:
632 if (!first_frag) {
633 first_frag = pos;
634 next_tsn = ctsn + 1;
635 last_frag = pos;
636 } else
637 goto done;
638 break;
639
640 case SCTP_DATA_MIDDLE_FRAG:
641 if (!first_frag)
642 return NULL;
643 if (ctsn == next_tsn) {
644 next_tsn++;
645 last_frag = pos;
646 } else
647 goto done;
648 break;
649
650 case SCTP_DATA_LAST_FRAG:
651 if (!first_frag)
652 return NULL;
653 else
654 goto done;
655 break;
656
657 default:
658 return NULL;
659 }
660 }
661
662
663
664
665done:
666 retval = sctp_make_reassembled_event(ulpq->asoc->base.net, &ulpq->reasm,
667 first_frag, last_frag);
668 return retval;
669}
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685void sctp_ulpq_reasm_flushtsn(struct sctp_ulpq *ulpq, __u32 fwd_tsn)
686{
687 struct sk_buff *pos, *tmp;
688 struct sctp_ulpevent *event;
689 __u32 tsn;
690
691 if (skb_queue_empty(&ulpq->reasm))
692 return;
693
694 skb_queue_walk_safe(&ulpq->reasm, pos, tmp) {
695 event = sctp_skb2event(pos);
696 tsn = event->tsn;
697
698
699
700
701
702
703 if (TSN_lte(tsn, fwd_tsn)) {
704 __skb_unlink(pos, &ulpq->reasm);
705 sctp_ulpevent_free(event);
706 } else
707 break;
708 }
709}
710
711
712
713
714
715
716static void sctp_ulpq_reasm_drain(struct sctp_ulpq *ulpq)
717{
718 struct sctp_ulpevent *event = NULL;
719
720 if (skb_queue_empty(&ulpq->reasm))
721 return;
722
723 while ((event = sctp_ulpq_retrieve_reassembled(ulpq)) != NULL) {
724 struct sk_buff_head temp;
725
726 skb_queue_head_init(&temp);
727 __skb_queue_tail(&temp, sctp_event2skb(event));
728
729
730 if (event->msg_flags & MSG_EOR)
731 event = sctp_ulpq_order(ulpq, event);
732
733
734
735
736 if (event)
737 sctp_ulpq_tail_event(ulpq, &temp);
738 }
739}
740
741
742
743
744
745static void sctp_ulpq_retrieve_ordered(struct sctp_ulpq *ulpq,
746 struct sctp_ulpevent *event)
747{
748 struct sk_buff_head *event_list;
749 struct sk_buff *pos, *tmp;
750 struct sctp_ulpevent *cevent;
751 struct sctp_stream *stream;
752 __u16 sid, csid, cssn;
753
754 sid = event->stream;
755 stream = &ulpq->asoc->stream;
756
757 event_list = (struct sk_buff_head *) sctp_event2skb(event)->prev;
758
759
760 sctp_skb_for_each(pos, &ulpq->lobby, tmp) {
761 cevent = (struct sctp_ulpevent *) pos->cb;
762 csid = cevent->stream;
763 cssn = cevent->ssn;
764
765
766 if (csid > sid)
767 break;
768
769
770 if (csid < sid)
771 continue;
772
773 if (cssn != sctp_ssn_peek(stream, in, sid))
774 break;
775
776
777 sctp_ssn_next(stream, in, sid);
778
779 __skb_unlink(pos, &ulpq->lobby);
780
781
782 __skb_queue_tail(event_list, pos);
783 }
784}
785
786
787static void sctp_ulpq_store_ordered(struct sctp_ulpq *ulpq,
788 struct sctp_ulpevent *event)
789{
790 struct sk_buff *pos;
791 struct sctp_ulpevent *cevent;
792 __u16 sid, csid;
793 __u16 ssn, cssn;
794
795 pos = skb_peek_tail(&ulpq->lobby);
796 if (!pos) {
797 __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
798 return;
799 }
800
801 sid = event->stream;
802 ssn = event->ssn;
803
804 cevent = (struct sctp_ulpevent *) pos->cb;
805 csid = cevent->stream;
806 cssn = cevent->ssn;
807 if (sid > csid) {
808 __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
809 return;
810 }
811
812 if ((sid == csid) && SSN_lt(cssn, ssn)) {
813 __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
814 return;
815 }
816
817
818
819
820 skb_queue_walk(&ulpq->lobby, pos) {
821 cevent = (struct sctp_ulpevent *) pos->cb;
822 csid = cevent->stream;
823 cssn = cevent->ssn;
824
825 if (csid > sid)
826 break;
827 if (csid == sid && SSN_lt(ssn, cssn))
828 break;
829 }
830
831
832
833 __skb_queue_before(&ulpq->lobby, pos, sctp_event2skb(event));
834}
835
836static struct sctp_ulpevent *sctp_ulpq_order(struct sctp_ulpq *ulpq,
837 struct sctp_ulpevent *event)
838{
839 __u16 sid, ssn;
840 struct sctp_stream *stream;
841
842
843 if (event->msg_flags & SCTP_DATA_UNORDERED)
844 return event;
845
846
847 sid = event->stream;
848 ssn = event->ssn;
849 stream = &ulpq->asoc->stream;
850
851
852 if (ssn != sctp_ssn_peek(stream, in, sid)) {
853
854
855
856 sctp_ulpq_store_ordered(ulpq, event);
857 return NULL;
858 }
859
860
861 sctp_ssn_next(stream, in, sid);
862
863
864
865
866 sctp_ulpq_retrieve_ordered(ulpq, event);
867
868 return event;
869}
870
871
872
873
874static void sctp_ulpq_reap_ordered(struct sctp_ulpq *ulpq, __u16 sid)
875{
876 struct sk_buff *pos, *tmp;
877 struct sctp_ulpevent *cevent;
878 struct sctp_ulpevent *event;
879 struct sctp_stream *stream;
880 struct sk_buff_head temp;
881 struct sk_buff_head *lobby = &ulpq->lobby;
882 __u16 csid, cssn;
883
884 stream = &ulpq->asoc->stream;
885
886
887 skb_queue_head_init(&temp);
888 event = NULL;
889 sctp_skb_for_each(pos, lobby, tmp) {
890 cevent = (struct sctp_ulpevent *) pos->cb;
891 csid = cevent->stream;
892 cssn = cevent->ssn;
893
894
895 if (csid > sid)
896 break;
897
898
899 if (csid < sid)
900 continue;
901
902
903 if (!SSN_lt(cssn, sctp_ssn_peek(stream, in, csid)))
904 break;
905
906 __skb_unlink(pos, lobby);
907 if (!event)
908
909 event = sctp_skb2event(pos);
910
911
912 __skb_queue_tail(&temp, pos);
913 }
914
915
916
917
918 if (event == NULL && pos != (struct sk_buff *)lobby) {
919 cevent = (struct sctp_ulpevent *) pos->cb;
920 csid = cevent->stream;
921 cssn = cevent->ssn;
922
923 if (csid == sid && cssn == sctp_ssn_peek(stream, in, csid)) {
924 sctp_ssn_next(stream, in, csid);
925 __skb_unlink(pos, lobby);
926 __skb_queue_tail(&temp, pos);
927 event = sctp_skb2event(pos);
928 }
929 }
930
931
932
933
934 if (event) {
935
936 sctp_ulpq_retrieve_ordered(ulpq, event);
937 sctp_ulpq_tail_event(ulpq, &temp);
938 }
939}
940
941
942
943
944void sctp_ulpq_skip(struct sctp_ulpq *ulpq, __u16 sid, __u16 ssn)
945{
946 struct sctp_stream *stream;
947
948
949 stream = &ulpq->asoc->stream;
950
951
952 if (SSN_lt(ssn, sctp_ssn_peek(stream, in, sid)))
953 return;
954
955
956 sctp_ssn_skip(stream, in, sid, ssn);
957
958
959
960
961 sctp_ulpq_reap_ordered(ulpq, sid);
962}
963
964__u16 sctp_ulpq_renege_list(struct sctp_ulpq *ulpq, struct sk_buff_head *list,
965 __u16 needed)
966{
967 __u16 freed = 0;
968 __u32 tsn, last_tsn;
969 struct sk_buff *skb, *flist, *last;
970 struct sctp_ulpevent *event;
971 struct sctp_tsnmap *tsnmap;
972
973 tsnmap = &ulpq->asoc->peer.tsn_map;
974
975 while ((skb = skb_peek_tail(list)) != NULL) {
976 event = sctp_skb2event(skb);
977 tsn = event->tsn;
978
979
980 if (TSN_lte(tsn, sctp_tsnmap_get_ctsn(tsnmap)))
981 break;
982
983
984
985
986
987 freed += skb_headlen(skb);
988 flist = skb_shinfo(skb)->frag_list;
989 for (last = flist; flist; flist = flist->next) {
990 last = flist;
991 freed += skb_headlen(last);
992 }
993 if (last)
994 last_tsn = sctp_skb2event(last)->tsn;
995 else
996 last_tsn = tsn;
997
998
999 __skb_unlink(skb, list);
1000 sctp_ulpevent_free(event);
1001 while (TSN_lte(tsn, last_tsn)) {
1002 sctp_tsnmap_renege(tsnmap, tsn);
1003 tsn++;
1004 }
1005 if (freed >= needed)
1006 return freed;
1007 }
1008
1009 return freed;
1010}
1011
1012
1013static __u16 sctp_ulpq_renege_order(struct sctp_ulpq *ulpq, __u16 needed)
1014{
1015 return sctp_ulpq_renege_list(ulpq, &ulpq->lobby, needed);
1016}
1017
1018
1019static __u16 sctp_ulpq_renege_frags(struct sctp_ulpq *ulpq, __u16 needed)
1020{
1021 return sctp_ulpq_renege_list(ulpq, &ulpq->reasm, needed);
1022}
1023
1024
1025void sctp_ulpq_partial_delivery(struct sctp_ulpq *ulpq,
1026 gfp_t gfp)
1027{
1028 struct sctp_ulpevent *event;
1029 struct sctp_association *asoc;
1030 struct sctp_sock *sp;
1031 __u32 ctsn;
1032 struct sk_buff *skb;
1033
1034 asoc = ulpq->asoc;
1035 sp = sctp_sk(asoc->base.sk);
1036
1037
1038
1039
1040 if (ulpq->pd_mode)
1041 return;
1042
1043
1044
1045
1046 skb = skb_peek(&asoc->ulpq.reasm);
1047 if (skb != NULL) {
1048 ctsn = sctp_skb2event(skb)->tsn;
1049 if (!TSN_lte(ctsn, sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)))
1050 return;
1051 }
1052
1053
1054
1055
1056
1057
1058 if (sp->frag_interleave || atomic_read(&sp->pd_mode) == 0) {
1059
1060 event = sctp_ulpq_retrieve_first(ulpq);
1061
1062 if (event) {
1063 struct sk_buff_head temp;
1064
1065 skb_queue_head_init(&temp);
1066 __skb_queue_tail(&temp, sctp_event2skb(event));
1067 sctp_ulpq_tail_event(ulpq, &temp);
1068 sctp_ulpq_set_pd(ulpq);
1069 return;
1070 }
1071 }
1072}
1073
1074
1075void sctp_ulpq_renege(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk,
1076 gfp_t gfp)
1077{
1078 struct sctp_association *asoc = ulpq->asoc;
1079 __u32 freed = 0;
1080 __u16 needed;
1081
1082 needed = ntohs(chunk->chunk_hdr->length) -
1083 sizeof(struct sctp_data_chunk);
1084
1085 if (skb_queue_empty(&asoc->base.sk->sk_receive_queue)) {
1086 freed = sctp_ulpq_renege_order(ulpq, needed);
1087 if (freed < needed)
1088 freed += sctp_ulpq_renege_frags(ulpq, needed - freed);
1089 }
1090
1091 if (sk_rmem_schedule(asoc->base.sk, chunk->skb, needed) &&
1092 freed >= needed) {
1093 int retval = sctp_ulpq_tail_data(ulpq, chunk, gfp);
1094
1095
1096
1097
1098 if (retval <= 0)
1099 sctp_ulpq_partial_delivery(ulpq, gfp);
1100 else if (retval == 1)
1101 sctp_ulpq_reasm_drain(ulpq);
1102 }
1103
1104 sk_mem_reclaim(asoc->base.sk);
1105}
1106
1107
1108
1109
1110
1111
1112void sctp_ulpq_abort_pd(struct sctp_ulpq *ulpq, gfp_t gfp)
1113{
1114 struct sctp_ulpevent *ev = NULL;
1115 struct sctp_sock *sp;
1116 struct sock *sk;
1117
1118 if (!ulpq->pd_mode)
1119 return;
1120
1121 sk = ulpq->asoc->base.sk;
1122 sp = sctp_sk(sk);
1123 if (sctp_ulpevent_type_enabled(ulpq->asoc->subscribe,
1124 SCTP_PARTIAL_DELIVERY_EVENT))
1125 ev = sctp_ulpevent_make_pdapi(ulpq->asoc,
1126 SCTP_PARTIAL_DELIVERY_ABORTED,
1127 0, 0, 0, gfp);
1128 if (ev)
1129 __skb_queue_tail(&sk->sk_receive_queue, sctp_event2skb(ev));
1130
1131
1132 if ((sctp_ulpq_clear_pd(ulpq) || ev) && !sp->data_ready_signalled) {
1133 sp->data_ready_signalled = 1;
1134 sk->sk_data_ready(sk);
1135 }
1136}
1137