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