1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37#include <linux/slab.h>
38#include <linux/types.h>
39#include <linux/skbuff.h>
40#include <net/sock.h>
41#include <net/busy_poll.h>
42#include <net/sctp/structs.h>
43#include <net/sctp/sctp.h>
44#include <net/sctp/sm.h>
45
46
47static struct sctp_ulpevent *sctp_ulpq_reasm(struct sctp_ulpq *ulpq,
48 struct sctp_ulpevent *);
49static struct sctp_ulpevent *sctp_ulpq_order(struct sctp_ulpq *,
50 struct sctp_ulpevent *);
51static void sctp_ulpq_reasm_drain(struct sctp_ulpq *ulpq);
52
53
54
55
56struct sctp_ulpq *sctp_ulpq_init(struct sctp_ulpq *ulpq,
57 struct sctp_association *asoc)
58{
59 memset(ulpq, 0, sizeof(struct sctp_ulpq));
60
61 ulpq->asoc = asoc;
62 skb_queue_head_init(&ulpq->reasm);
63 skb_queue_head_init(&ulpq->lobby);
64 ulpq->pd_mode = 0;
65
66 return ulpq;
67}
68
69
70
71void sctp_ulpq_flush(struct sctp_ulpq *ulpq)
72{
73 struct sk_buff *skb;
74 struct sctp_ulpevent *event;
75
76 while ((skb = __skb_dequeue(&ulpq->lobby)) != NULL) {
77 event = sctp_skb2event(skb);
78 sctp_ulpevent_free(event);
79 }
80
81 while ((skb = __skb_dequeue(&ulpq->reasm)) != NULL) {
82 event = sctp_skb2event(skb);
83 sctp_ulpevent_free(event);
84 }
85
86}
87
88
89void sctp_ulpq_free(struct sctp_ulpq *ulpq)
90{
91 sctp_ulpq_flush(ulpq);
92}
93
94
95int sctp_ulpq_tail_data(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk,
96 gfp_t gfp)
97{
98 struct sk_buff_head temp;
99 struct sctp_ulpevent *event;
100 int event_eor = 0;
101
102
103 event = sctp_ulpevent_make_rcvmsg(chunk->asoc, chunk, gfp);
104 if (!event)
105 return -ENOMEM;
106
107
108 event = sctp_ulpq_reasm(ulpq, event);
109
110
111 if ((event) && (event->msg_flags & MSG_EOR)) {
112
113 skb_queue_head_init(&temp);
114 __skb_queue_tail(&temp, sctp_event2skb(event));
115
116 event = sctp_ulpq_order(ulpq, event);
117 }
118
119
120
121
122 if (event) {
123 event_eor = (event->msg_flags & MSG_EOR) ? 1 : 0;
124 sctp_ulpq_tail_event(ulpq, event);
125 }
126
127 return event_eor;
128}
129
130
131
132
133
134int sctp_clear_pd(struct sock *sk, struct sctp_association *asoc)
135{
136 struct sctp_sock *sp = sctp_sk(sk);
137
138 if (atomic_dec_and_test(&sp->pd_mode)) {
139
140
141
142 if (!skb_queue_empty(&sp->pd_lobby)) {
143 struct list_head *list;
144 sctp_skb_list_tail(&sp->pd_lobby, &sk->sk_receive_queue);
145 list = (struct list_head *)&sctp_sk(sk)->pd_lobby;
146 INIT_LIST_HEAD(list);
147 return 1;
148 }
149 } else {
150
151
152
153
154
155 if (!skb_queue_empty(&sp->pd_lobby) && asoc) {
156 struct sk_buff *skb, *tmp;
157 struct sctp_ulpevent *event;
158
159 sctp_skb_for_each(skb, &sp->pd_lobby, tmp) {
160 event = sctp_skb2event(skb);
161 if (event->asoc == asoc) {
162 __skb_unlink(skb, &sp->pd_lobby);
163 __skb_queue_tail(&sk->sk_receive_queue,
164 skb);
165 }
166 }
167 }
168 }
169
170 return 0;
171}
172
173
174static void sctp_ulpq_set_pd(struct sctp_ulpq *ulpq)
175{
176 struct sctp_sock *sp = sctp_sk(ulpq->asoc->base.sk);
177
178 atomic_inc(&sp->pd_mode);
179 ulpq->pd_mode = 1;
180}
181
182
183static int sctp_ulpq_clear_pd(struct sctp_ulpq *ulpq)
184{
185 ulpq->pd_mode = 0;
186 sctp_ulpq_reasm_drain(ulpq);
187 return sctp_clear_pd(ulpq->asoc->base.sk, ulpq->asoc);
188}
189
190
191
192
193int sctp_ulpq_tail_event(struct sctp_ulpq *ulpq, struct sctp_ulpevent *event)
194{
195 struct sock *sk = ulpq->asoc->base.sk;
196 struct sk_buff_head *queue, *skb_list;
197 struct sk_buff *skb = sctp_event2skb(event);
198 int clear_pd = 0;
199
200 skb_list = (struct sk_buff_head *) skb->prev;
201
202
203
204
205 if (sock_flag(sk, SOCK_DEAD) || (sk->sk_shutdown & RCV_SHUTDOWN))
206 goto out_free;
207
208 if (!sctp_ulpevent_is_notification(event)) {
209 sk_mark_napi_id(sk, skb);
210 sk_incoming_cpu_update(sk);
211 }
212
213 if (!sctp_ulpevent_is_enabled(event, &sctp_sk(sk)->subscribe))
214 goto out_free;
215
216
217
218
219
220
221 if (atomic_read(&sctp_sk(sk)->pd_mode) == 0) {
222 queue = &sk->sk_receive_queue;
223 } else {
224 if (ulpq->pd_mode) {
225
226
227
228
229
230 if ((event->msg_flags & MSG_NOTIFICATION) ||
231 (SCTP_DATA_NOT_FRAG ==
232 (event->msg_flags & SCTP_DATA_FRAG_MASK)))
233 queue = &sctp_sk(sk)->pd_lobby;
234 else {
235 clear_pd = event->msg_flags & MSG_EOR;
236 queue = &sk->sk_receive_queue;
237 }
238 } else {
239
240
241
242
243
244 if (sctp_sk(sk)->frag_interleave)
245 queue = &sk->sk_receive_queue;
246 else
247 queue = &sctp_sk(sk)->pd_lobby;
248 }
249 }
250
251
252
253
254 if (skb_list)
255 sctp_skb_list_tail(skb_list, queue);
256 else
257 __skb_queue_tail(queue, skb);
258
259
260
261
262
263 if (clear_pd)
264 sctp_ulpq_clear_pd(ulpq);
265
266 if (queue == &sk->sk_receive_queue)
267 sk->sk_data_ready(sk);
268 return 1;
269
270out_free:
271 if (skb_list)
272 sctp_queue_purge_ulpevents(skb_list);
273 else
274 sctp_ulpevent_free(event);
275
276 return 0;
277}
278
279
280
281
282static void sctp_ulpq_store_reasm(struct sctp_ulpq *ulpq,
283 struct sctp_ulpevent *event)
284{
285 struct sk_buff *pos;
286 struct sctp_ulpevent *cevent;
287 __u32 tsn, ctsn;
288
289 tsn = event->tsn;
290
291
292 pos = skb_peek_tail(&ulpq->reasm);
293 if (!pos) {
294 __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event));
295 return;
296 }
297
298
299 cevent = sctp_skb2event(pos);
300 ctsn = cevent->tsn;
301 if (TSN_lt(ctsn, tsn)) {
302 __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event));
303 return;
304 }
305
306
307 skb_queue_walk(&ulpq->reasm, pos) {
308 cevent = sctp_skb2event(pos);
309 ctsn = cevent->tsn;
310
311 if (TSN_lt(tsn, ctsn))
312 break;
313 }
314
315
316 __skb_queue_before(&ulpq->reasm, pos, sctp_event2skb(event));
317
318}
319
320
321
322
323
324
325
326
327static struct sctp_ulpevent *sctp_make_reassembled_event(struct net *net,
328 struct sk_buff_head *queue, struct sk_buff *f_frag,
329 struct sk_buff *l_frag)
330{
331 struct sk_buff *pos;
332 struct sk_buff *new = NULL;
333 struct sctp_ulpevent *event;
334 struct sk_buff *pnext, *last;
335 struct sk_buff *list = skb_shinfo(f_frag)->frag_list;
336
337
338 if (f_frag == l_frag)
339 pos = NULL;
340 else
341 pos = f_frag->next;
342
343
344 for (last = list; list; last = list, list = list->next)
345 ;
346
347
348
349
350 if (last)
351 last->next = pos;
352 else {
353 if (skb_cloned(f_frag)) {
354
355
356
357
358
359 new = skb_copy(f_frag, GFP_ATOMIC);
360 if (!new)
361 return NULL;
362
363 sctp_skb_set_owner_r(new, f_frag->sk);
364
365 skb_shinfo(new)->frag_list = pos;
366 } else
367 skb_shinfo(f_frag)->frag_list = pos;
368 }
369
370
371 __skb_unlink(f_frag, queue);
372
373
374 if (new) {
375 kfree_skb(f_frag);
376 f_frag = new;
377 }
378
379 while (pos) {
380
381 pnext = pos->next;
382
383
384 f_frag->len += pos->len;
385 f_frag->data_len += pos->len;
386
387
388 __skb_unlink(pos, queue);
389
390
391 if (pos == l_frag)
392 break;
393 pos->next = pnext;
394 pos = pnext;
395 }
396
397 event = sctp_skb2event(f_frag);
398 SCTP_INC_STATS(net, SCTP_MIB_REASMUSRMSGS);
399
400 return event;
401}
402
403
404
405
406
407static struct sctp_ulpevent *sctp_ulpq_retrieve_reassembled(struct sctp_ulpq *ulpq)
408{
409 struct sk_buff *pos;
410 struct sctp_ulpevent *cevent;
411 struct sk_buff *first_frag = NULL;
412 __u32 ctsn, next_tsn;
413 struct sctp_ulpevent *retval = NULL;
414 struct sk_buff *pd_first = NULL;
415 struct sk_buff *pd_last = NULL;
416 size_t pd_len = 0;
417 struct sctp_association *asoc;
418 u32 pd_point;
419
420
421
422
423
424 next_tsn = 0;
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439 skb_queue_walk(&ulpq->reasm, pos) {
440 cevent = sctp_skb2event(pos);
441 ctsn = cevent->tsn;
442
443 switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
444 case SCTP_DATA_FIRST_FRAG:
445
446
447
448
449 if (pos == ulpq->reasm.next) {
450 pd_first = pos;
451 pd_last = pos;
452 pd_len = pos->len;
453 } else {
454 pd_first = NULL;
455 pd_last = NULL;
456 pd_len = 0;
457 }
458
459 first_frag = pos;
460 next_tsn = ctsn + 1;
461 break;
462
463 case SCTP_DATA_MIDDLE_FRAG:
464 if ((first_frag) && (ctsn == next_tsn)) {
465 next_tsn++;
466 if (pd_first) {
467 pd_last = pos;
468 pd_len += pos->len;
469 }
470 } else
471 first_frag = NULL;
472 break;
473
474 case SCTP_DATA_LAST_FRAG:
475 if (first_frag && (ctsn == next_tsn))
476 goto found;
477 else
478 first_frag = NULL;
479 break;
480 }
481 }
482
483 asoc = ulpq->asoc;
484 if (pd_first) {
485
486
487
488
489
490 if (!sctp_sk(asoc->base.sk)->frag_interleave &&
491 atomic_read(&sctp_sk(asoc->base.sk)->pd_mode))
492 goto done;
493
494 cevent = sctp_skb2event(pd_first);
495 pd_point = sctp_sk(asoc->base.sk)->pd_point;
496 if (pd_point && pd_point <= pd_len) {
497 retval = sctp_make_reassembled_event(sock_net(asoc->base.sk),
498 &ulpq->reasm,
499 pd_first,
500 pd_last);
501 if (retval)
502 sctp_ulpq_set_pd(ulpq);
503 }
504 }
505done:
506 return retval;
507found:
508 retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk),
509 &ulpq->reasm, first_frag, pos);
510 if (retval)
511 retval->msg_flags |= MSG_EOR;
512 goto done;
513}
514
515
516static struct sctp_ulpevent *sctp_ulpq_retrieve_partial(struct sctp_ulpq *ulpq)
517{
518 struct sk_buff *pos, *last_frag, *first_frag;
519 struct sctp_ulpevent *cevent;
520 __u32 ctsn, next_tsn;
521 int is_last;
522 struct sctp_ulpevent *retval;
523
524
525
526
527
528
529 if (skb_queue_empty(&ulpq->reasm))
530 return NULL;
531
532 last_frag = first_frag = NULL;
533 retval = NULL;
534 next_tsn = 0;
535 is_last = 0;
536
537 skb_queue_walk(&ulpq->reasm, pos) {
538 cevent = sctp_skb2event(pos);
539 ctsn = cevent->tsn;
540
541 switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
542 case SCTP_DATA_FIRST_FRAG:
543 if (!first_frag)
544 return NULL;
545 goto done;
546 case SCTP_DATA_MIDDLE_FRAG:
547 if (!first_frag) {
548 first_frag = pos;
549 next_tsn = ctsn + 1;
550 last_frag = pos;
551 } else if (next_tsn == ctsn) {
552 next_tsn++;
553 last_frag = pos;
554 } else
555 goto done;
556 break;
557 case SCTP_DATA_LAST_FRAG:
558 if (!first_frag)
559 first_frag = pos;
560 else if (ctsn != next_tsn)
561 goto done;
562 last_frag = pos;
563 is_last = 1;
564 goto done;
565 default:
566 return NULL;
567 }
568 }
569
570
571
572
573done:
574 retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk),
575 &ulpq->reasm, first_frag, last_frag);
576 if (retval && is_last)
577 retval->msg_flags |= MSG_EOR;
578
579 return retval;
580}
581
582
583
584
585
586static struct sctp_ulpevent *sctp_ulpq_reasm(struct sctp_ulpq *ulpq,
587 struct sctp_ulpevent *event)
588{
589 struct sctp_ulpevent *retval = NULL;
590
591
592 if (SCTP_DATA_NOT_FRAG == (event->msg_flags & SCTP_DATA_FRAG_MASK)) {
593 event->msg_flags |= MSG_EOR;
594 return event;
595 }
596
597 sctp_ulpq_store_reasm(ulpq, event);
598 if (!ulpq->pd_mode)
599 retval = sctp_ulpq_retrieve_reassembled(ulpq);
600 else {
601 __u32 ctsn, ctsnap;
602
603
604
605
606 ctsn = event->tsn;
607 ctsnap = sctp_tsnmap_get_ctsn(&ulpq->asoc->peer.tsn_map);
608 if (TSN_lte(ctsn, ctsnap))
609 retval = sctp_ulpq_retrieve_partial(ulpq);
610 }
611
612 return retval;
613}
614
615
616static struct sctp_ulpevent *sctp_ulpq_retrieve_first(struct sctp_ulpq *ulpq)
617{
618 struct sk_buff *pos, *last_frag, *first_frag;
619 struct sctp_ulpevent *cevent;
620 __u32 ctsn, next_tsn;
621 struct sctp_ulpevent *retval;
622
623
624
625
626
627
628 if (skb_queue_empty(&ulpq->reasm))
629 return NULL;
630
631 last_frag = first_frag = NULL;
632 retval = NULL;
633 next_tsn = 0;
634
635 skb_queue_walk(&ulpq->reasm, pos) {
636 cevent = sctp_skb2event(pos);
637 ctsn = cevent->tsn;
638
639 switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
640 case SCTP_DATA_FIRST_FRAG:
641 if (!first_frag) {
642 first_frag = pos;
643 next_tsn = ctsn + 1;
644 last_frag = pos;
645 } else
646 goto done;
647 break;
648
649 case SCTP_DATA_MIDDLE_FRAG:
650 if (!first_frag)
651 return NULL;
652 if (ctsn == next_tsn) {
653 next_tsn++;
654 last_frag = pos;
655 } else
656 goto done;
657 break;
658
659 case SCTP_DATA_LAST_FRAG:
660 if (!first_frag)
661 return NULL;
662 else
663 goto done;
664 break;
665
666 default:
667 return NULL;
668 }
669 }
670
671
672
673
674done:
675 retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk),
676 &ulpq->reasm, first_frag, last_frag);
677 return retval;
678}
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694void sctp_ulpq_reasm_flushtsn(struct sctp_ulpq *ulpq, __u32 fwd_tsn)
695{
696 struct sk_buff *pos, *tmp;
697 struct sctp_ulpevent *event;
698 __u32 tsn;
699
700 if (skb_queue_empty(&ulpq->reasm))
701 return;
702
703 skb_queue_walk_safe(&ulpq->reasm, pos, tmp) {
704 event = sctp_skb2event(pos);
705 tsn = event->tsn;
706
707
708
709
710
711
712 if (TSN_lte(tsn, fwd_tsn)) {
713 __skb_unlink(pos, &ulpq->reasm);
714 sctp_ulpevent_free(event);
715 } else
716 break;
717 }
718}
719
720
721
722
723
724
725static void sctp_ulpq_reasm_drain(struct sctp_ulpq *ulpq)
726{
727 struct sctp_ulpevent *event = NULL;
728 struct sk_buff_head temp;
729
730 if (skb_queue_empty(&ulpq->reasm))
731 return;
732
733 while ((event = sctp_ulpq_retrieve_reassembled(ulpq)) != NULL) {
734
735 if ((event) && (event->msg_flags & MSG_EOR)) {
736 skb_queue_head_init(&temp);
737 __skb_queue_tail(&temp, sctp_event2skb(event));
738
739 event = sctp_ulpq_order(ulpq, event);
740 }
741
742
743
744
745 if (event)
746 sctp_ulpq_tail_event(ulpq, event);
747 }
748}
749
750
751
752
753
754static void sctp_ulpq_retrieve_ordered(struct sctp_ulpq *ulpq,
755 struct sctp_ulpevent *event)
756{
757 struct sk_buff_head *event_list;
758 struct sk_buff *pos, *tmp;
759 struct sctp_ulpevent *cevent;
760 struct sctp_stream *in;
761 __u16 sid, csid, cssn;
762
763 sid = event->stream;
764 in = &ulpq->asoc->ssnmap->in;
765
766 event_list = (struct sk_buff_head *) sctp_event2skb(event)->prev;
767
768
769 sctp_skb_for_each(pos, &ulpq->lobby, tmp) {
770 cevent = (struct sctp_ulpevent *) pos->cb;
771 csid = cevent->stream;
772 cssn = cevent->ssn;
773
774
775 if (csid > sid)
776 break;
777
778
779 if (csid < sid)
780 continue;
781
782 if (cssn != sctp_ssn_peek(in, sid))
783 break;
784
785
786 sctp_ssn_next(in, sid);
787
788 __skb_unlink(pos, &ulpq->lobby);
789
790
791 __skb_queue_tail(event_list, pos);
792 }
793}
794
795
796static void sctp_ulpq_store_ordered(struct sctp_ulpq *ulpq,
797 struct sctp_ulpevent *event)
798{
799 struct sk_buff *pos;
800 struct sctp_ulpevent *cevent;
801 __u16 sid, csid;
802 __u16 ssn, cssn;
803
804 pos = skb_peek_tail(&ulpq->lobby);
805 if (!pos) {
806 __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
807 return;
808 }
809
810 sid = event->stream;
811 ssn = event->ssn;
812
813 cevent = (struct sctp_ulpevent *) pos->cb;
814 csid = cevent->stream;
815 cssn = cevent->ssn;
816 if (sid > csid) {
817 __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
818 return;
819 }
820
821 if ((sid == csid) && SSN_lt(cssn, ssn)) {
822 __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
823 return;
824 }
825
826
827
828
829 skb_queue_walk(&ulpq->lobby, pos) {
830 cevent = (struct sctp_ulpevent *) pos->cb;
831 csid = cevent->stream;
832 cssn = cevent->ssn;
833
834 if (csid > sid)
835 break;
836 if (csid == sid && SSN_lt(ssn, cssn))
837 break;
838 }
839
840
841
842 __skb_queue_before(&ulpq->lobby, pos, sctp_event2skb(event));
843}
844
845static struct sctp_ulpevent *sctp_ulpq_order(struct sctp_ulpq *ulpq,
846 struct sctp_ulpevent *event)
847{
848 __u16 sid, ssn;
849 struct sctp_stream *in;
850
851
852 if (SCTP_DATA_UNORDERED & event->msg_flags)
853 return event;
854
855
856 sid = event->stream;
857 ssn = event->ssn;
858 in = &ulpq->asoc->ssnmap->in;
859
860
861 if (ssn != sctp_ssn_peek(in, sid)) {
862
863
864
865 sctp_ulpq_store_ordered(ulpq, event);
866 return NULL;
867 }
868
869
870 sctp_ssn_next(in, sid);
871
872
873
874
875 sctp_ulpq_retrieve_ordered(ulpq, event);
876
877 return event;
878}
879
880
881
882
883static void sctp_ulpq_reap_ordered(struct sctp_ulpq *ulpq, __u16 sid)
884{
885 struct sk_buff *pos, *tmp;
886 struct sctp_ulpevent *cevent;
887 struct sctp_ulpevent *event;
888 struct sctp_stream *in;
889 struct sk_buff_head temp;
890 struct sk_buff_head *lobby = &ulpq->lobby;
891 __u16 csid, cssn;
892
893 in = &ulpq->asoc->ssnmap->in;
894
895
896 skb_queue_head_init(&temp);
897 event = NULL;
898 sctp_skb_for_each(pos, lobby, tmp) {
899 cevent = (struct sctp_ulpevent *) pos->cb;
900 csid = cevent->stream;
901 cssn = cevent->ssn;
902
903
904 if (csid > sid)
905 break;
906
907
908 if (csid < sid)
909 continue;
910
911
912 if (!SSN_lt(cssn, sctp_ssn_peek(in, csid)))
913 break;
914
915 __skb_unlink(pos, lobby);
916 if (!event)
917
918 event = sctp_skb2event(pos);
919
920
921 __skb_queue_tail(&temp, pos);
922 }
923
924
925
926
927 if (event == NULL && pos != (struct sk_buff *)lobby) {
928 cevent = (struct sctp_ulpevent *) pos->cb;
929 csid = cevent->stream;
930 cssn = cevent->ssn;
931
932 if (csid == sid && cssn == sctp_ssn_peek(in, csid)) {
933 sctp_ssn_next(in, csid);
934 __skb_unlink(pos, lobby);
935 __skb_queue_tail(&temp, pos);
936 event = sctp_skb2event(pos);
937 }
938 }
939
940
941
942
943 if (event) {
944
945 sctp_ulpq_retrieve_ordered(ulpq, event);
946 sctp_ulpq_tail_event(ulpq, event);
947 }
948}
949
950
951
952
953void sctp_ulpq_skip(struct sctp_ulpq *ulpq, __u16 sid, __u16 ssn)
954{
955 struct sctp_stream *in;
956
957
958 in = &ulpq->asoc->ssnmap->in;
959
960
961 if (SSN_lt(ssn, sctp_ssn_peek(in, sid)))
962 return;
963
964
965 sctp_ssn_skip(in, sid, ssn);
966
967
968
969
970 sctp_ulpq_reap_ordered(ulpq, sid);
971}
972
973static __u16 sctp_ulpq_renege_list(struct sctp_ulpq *ulpq,
974 struct sk_buff_head *list, __u16 needed)
975{
976 __u16 freed = 0;
977 __u32 tsn, last_tsn;
978 struct sk_buff *skb, *flist, *last;
979 struct sctp_ulpevent *event;
980 struct sctp_tsnmap *tsnmap;
981
982 tsnmap = &ulpq->asoc->peer.tsn_map;
983
984 while ((skb = skb_peek_tail(list)) != NULL) {
985 event = sctp_skb2event(skb);
986 tsn = event->tsn;
987
988
989 if (TSN_lte(tsn, sctp_tsnmap_get_ctsn(tsnmap)))
990 break;
991
992
993
994
995
996 freed += skb_headlen(skb);
997 flist = skb_shinfo(skb)->frag_list;
998 for (last = flist; flist; flist = flist->next) {
999 last = flist;
1000 freed += skb_headlen(last);
1001 }
1002 if (last)
1003 last_tsn = sctp_skb2event(last)->tsn;
1004 else
1005 last_tsn = tsn;
1006
1007
1008 __skb_unlink(skb, list);
1009 sctp_ulpevent_free(event);
1010 while (TSN_lte(tsn, last_tsn)) {
1011 sctp_tsnmap_renege(tsnmap, tsn);
1012 tsn++;
1013 }
1014 if (freed >= needed)
1015 return freed;
1016 }
1017
1018 return freed;
1019}
1020
1021
1022static __u16 sctp_ulpq_renege_order(struct sctp_ulpq *ulpq, __u16 needed)
1023{
1024 return sctp_ulpq_renege_list(ulpq, &ulpq->lobby, needed);
1025}
1026
1027
1028static __u16 sctp_ulpq_renege_frags(struct sctp_ulpq *ulpq, __u16 needed)
1029{
1030 return sctp_ulpq_renege_list(ulpq, &ulpq->reasm, needed);
1031}
1032
1033
1034void sctp_ulpq_partial_delivery(struct sctp_ulpq *ulpq,
1035 gfp_t gfp)
1036{
1037 struct sctp_ulpevent *event;
1038 struct sctp_association *asoc;
1039 struct sctp_sock *sp;
1040 __u32 ctsn;
1041 struct sk_buff *skb;
1042
1043 asoc = ulpq->asoc;
1044 sp = sctp_sk(asoc->base.sk);
1045
1046
1047
1048
1049 if (ulpq->pd_mode)
1050 return;
1051
1052
1053
1054
1055 skb = skb_peek(&asoc->ulpq.reasm);
1056 if (skb != NULL) {
1057 ctsn = sctp_skb2event(skb)->tsn;
1058 if (!TSN_lte(ctsn, sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)))
1059 return;
1060 }
1061
1062
1063
1064
1065
1066
1067 if (sp->frag_interleave || atomic_read(&sp->pd_mode) == 0) {
1068
1069 event = sctp_ulpq_retrieve_first(ulpq);
1070
1071 if (event) {
1072 sctp_ulpq_tail_event(ulpq, event);
1073 sctp_ulpq_set_pd(ulpq);
1074 return;
1075 }
1076 }
1077}
1078
1079
1080void sctp_ulpq_renege(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk,
1081 gfp_t gfp)
1082{
1083 struct sctp_association *asoc;
1084 __u16 needed, freed;
1085
1086 asoc = ulpq->asoc;
1087
1088 if (chunk) {
1089 needed = ntohs(chunk->chunk_hdr->length);
1090 needed -= sizeof(sctp_data_chunk_t);
1091 } else
1092 needed = SCTP_DEFAULT_MAXWINDOW;
1093
1094 freed = 0;
1095
1096 if (skb_queue_empty(&asoc->base.sk->sk_receive_queue)) {
1097 freed = sctp_ulpq_renege_order(ulpq, needed);
1098 if (freed < needed) {
1099 freed += sctp_ulpq_renege_frags(ulpq, needed - freed);
1100 }
1101 }
1102
1103 if (chunk && (freed >= needed)) {
1104 int retval;
1105 retval = sctp_ulpq_tail_data(ulpq, chunk, gfp);
1106
1107
1108
1109
1110 if (retval <= 0)
1111 sctp_ulpq_partial_delivery(ulpq, gfp);
1112 else if (retval == 1)
1113 sctp_ulpq_reasm_drain(ulpq);
1114 }
1115
1116 sk_mem_reclaim(asoc->base.sk);
1117}
1118
1119
1120
1121
1122
1123
1124void sctp_ulpq_abort_pd(struct sctp_ulpq *ulpq, gfp_t gfp)
1125{
1126 struct sctp_ulpevent *ev = NULL;
1127 struct sock *sk;
1128
1129 if (!ulpq->pd_mode)
1130 return;
1131
1132 sk = ulpq->asoc->base.sk;
1133 if (sctp_ulpevent_type_enabled(SCTP_PARTIAL_DELIVERY_EVENT,
1134 &sctp_sk(sk)->subscribe))
1135 ev = sctp_ulpevent_make_pdapi(ulpq->asoc,
1136 SCTP_PARTIAL_DELIVERY_ABORTED,
1137 gfp);
1138 if (ev)
1139 __skb_queue_tail(&sk->sk_receive_queue, sctp_event2skb(ev));
1140
1141
1142 if (sctp_ulpq_clear_pd(ulpq) || ev)
1143 sk->sk_data_ready(sk);
1144}
1145