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41
42
43#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
44
45#include <linux/skbuff.h>
46#include <linux/types.h>
47#include <linux/socket.h>
48#include <linux/ip.h>
49#include <linux/gfp.h>
50#include <net/sock.h>
51#include <net/sctp/sctp.h>
52#include <net/sctp/sm.h>
53
54static int sctp_cmd_interpreter(sctp_event_t event_type,
55 sctp_subtype_t subtype,
56 sctp_state_t state,
57 struct sctp_endpoint *ep,
58 struct sctp_association *asoc,
59 void *event_arg,
60 sctp_disposition_t status,
61 sctp_cmd_seq_t *commands,
62 gfp_t gfp);
63static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
64 sctp_state_t state,
65 struct sctp_endpoint *ep,
66 struct sctp_association **asoc,
67 void *event_arg,
68 sctp_disposition_t status,
69 sctp_cmd_seq_t *commands,
70 gfp_t gfp);
71
72
73
74
75
76
77static void sctp_do_ecn_ce_work(struct sctp_association *asoc,
78 __u32 lowest_tsn)
79{
80
81
82 asoc->last_ecne_tsn = lowest_tsn;
83 asoc->need_ecne = 1;
84}
85
86
87
88
89
90
91
92
93
94
95
96
97
98static struct sctp_chunk *sctp_do_ecn_ecne_work(struct sctp_association *asoc,
99 __u32 lowest_tsn,
100 struct sctp_chunk *chunk)
101{
102 struct sctp_chunk *repl;
103
104
105
106
107
108
109
110
111
112
113
114 if (TSN_lt(asoc->last_cwr_tsn, lowest_tsn)) {
115 struct sctp_transport *transport;
116
117
118
119
120 transport = sctp_assoc_lookup_tsn(asoc, lowest_tsn);
121
122
123 if (transport)
124 sctp_transport_lower_cwnd(transport,
125 SCTP_LOWER_CWND_ECNE);
126 asoc->last_cwr_tsn = lowest_tsn;
127 }
128
129
130
131
132 repl = sctp_make_cwr(asoc, asoc->last_cwr_tsn, chunk);
133
134
135
136
137 return repl;
138}
139
140
141static void sctp_do_ecn_cwr_work(struct sctp_association *asoc,
142 __u32 lowest_tsn)
143{
144
145
146
147 asoc->need_ecne = 0;
148}
149
150
151static int sctp_gen_sack(struct sctp_association *asoc, int force,
152 sctp_cmd_seq_t *commands)
153{
154 __u32 ctsn, max_tsn_seen;
155 struct sctp_chunk *sack;
156 struct sctp_transport *trans = asoc->peer.last_data_from;
157 int error = 0;
158
159 if (force ||
160 (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) ||
161 (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE)))
162 asoc->peer.sack_needed = 1;
163
164 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
165 max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
166
167
168
169
170
171
172
173
174
175
176
177 if (max_tsn_seen != ctsn)
178 asoc->peer.sack_needed = 1;
179
180
181
182
183
184
185
186
187
188 if (!asoc->peer.sack_needed) {
189 asoc->peer.sack_cnt++;
190
191
192
193
194
195
196 if (trans) {
197
198 if (asoc->peer.sack_cnt >= trans->sackfreq - 1)
199 asoc->peer.sack_needed = 1;
200
201 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
202 trans->sackdelay;
203 } else {
204
205 if (asoc->peer.sack_cnt >= asoc->sackfreq - 1)
206 asoc->peer.sack_needed = 1;
207
208 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
209 asoc->sackdelay;
210 }
211
212
213 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
214 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
215 } else {
216 __u32 old_a_rwnd = asoc->a_rwnd;
217
218 asoc->a_rwnd = asoc->rwnd;
219 sack = sctp_make_sack(asoc);
220 if (!sack) {
221 asoc->a_rwnd = old_a_rwnd;
222 goto nomem;
223 }
224
225 asoc->peer.sack_needed = 0;
226 asoc->peer.sack_cnt = 0;
227
228 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack));
229
230
231 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
232 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
233 }
234
235 return error;
236nomem:
237 error = -ENOMEM;
238 return error;
239}
240
241
242
243
244void sctp_generate_t3_rtx_event(unsigned long peer)
245{
246 int error;
247 struct sctp_transport *transport = (struct sctp_transport *) peer;
248 struct sctp_association *asoc = transport->asoc;
249 struct sock *sk = asoc->base.sk;
250 struct net *net = sock_net(sk);
251
252
253
254 bh_lock_sock(sk);
255 if (sock_owned_by_user(sk)) {
256 pr_debug("%s: sock is busy\n", __func__);
257
258
259 if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20)))
260 sctp_transport_hold(transport);
261 goto out_unlock;
262 }
263
264
265 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
266 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX),
267 asoc->state,
268 asoc->ep, asoc,
269 transport, GFP_ATOMIC);
270
271 if (error)
272 sk->sk_err = -error;
273
274out_unlock:
275 bh_unlock_sock(sk);
276 sctp_transport_put(transport);
277}
278
279
280
281
282static void sctp_generate_timeout_event(struct sctp_association *asoc,
283 sctp_event_timeout_t timeout_type)
284{
285 struct sock *sk = asoc->base.sk;
286 struct net *net = sock_net(sk);
287 int error = 0;
288
289 bh_lock_sock(sk);
290 if (sock_owned_by_user(sk)) {
291 pr_debug("%s: sock is busy: timer %d\n", __func__,
292 timeout_type);
293
294
295 if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20)))
296 sctp_association_hold(asoc);
297 goto out_unlock;
298 }
299
300
301
302
303 if (asoc->base.dead)
304 goto out_unlock;
305
306
307 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
308 SCTP_ST_TIMEOUT(timeout_type),
309 asoc->state, asoc->ep, asoc,
310 (void *)timeout_type, GFP_ATOMIC);
311
312 if (error)
313 sk->sk_err = -error;
314
315out_unlock:
316 bh_unlock_sock(sk);
317 sctp_association_put(asoc);
318}
319
320static void sctp_generate_t1_cookie_event(unsigned long data)
321{
322 struct sctp_association *asoc = (struct sctp_association *) data;
323 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE);
324}
325
326static void sctp_generate_t1_init_event(unsigned long data)
327{
328 struct sctp_association *asoc = (struct sctp_association *) data;
329 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT);
330}
331
332static void sctp_generate_t2_shutdown_event(unsigned long data)
333{
334 struct sctp_association *asoc = (struct sctp_association *) data;
335 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN);
336}
337
338static void sctp_generate_t4_rto_event(unsigned long data)
339{
340 struct sctp_association *asoc = (struct sctp_association *) data;
341 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO);
342}
343
344static void sctp_generate_t5_shutdown_guard_event(unsigned long data)
345{
346 struct sctp_association *asoc = (struct sctp_association *)data;
347 sctp_generate_timeout_event(asoc,
348 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD);
349
350}
351
352static void sctp_generate_autoclose_event(unsigned long data)
353{
354 struct sctp_association *asoc = (struct sctp_association *) data;
355 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE);
356}
357
358
359
360
361void sctp_generate_heartbeat_event(unsigned long data)
362{
363 int error = 0;
364 struct sctp_transport *transport = (struct sctp_transport *) data;
365 struct sctp_association *asoc = transport->asoc;
366 struct sock *sk = asoc->base.sk;
367 struct net *net = sock_net(sk);
368 u32 elapsed, timeout;
369
370 bh_lock_sock(sk);
371 if (sock_owned_by_user(sk)) {
372 pr_debug("%s: sock is busy\n", __func__);
373
374
375 if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20)))
376 sctp_transport_hold(transport);
377 goto out_unlock;
378 }
379
380
381 elapsed = jiffies - transport->last_time_sent;
382 timeout = sctp_transport_timeout(transport);
383 if (elapsed < timeout) {
384 elapsed = timeout - elapsed;
385 if (!mod_timer(&transport->hb_timer, jiffies + elapsed))
386 sctp_transport_hold(transport);
387 goto out_unlock;
388 }
389
390 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
391 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT),
392 asoc->state, asoc->ep, asoc,
393 transport, GFP_ATOMIC);
394
395 if (error)
396 sk->sk_err = -error;
397
398out_unlock:
399 bh_unlock_sock(sk);
400 sctp_transport_put(transport);
401}
402
403
404
405
406void sctp_generate_proto_unreach_event(unsigned long data)
407{
408 struct sctp_transport *transport = (struct sctp_transport *) data;
409 struct sctp_association *asoc = transport->asoc;
410 struct sock *sk = asoc->base.sk;
411 struct net *net = sock_net(sk);
412
413 bh_lock_sock(sk);
414 if (sock_owned_by_user(sk)) {
415 pr_debug("%s: sock is busy\n", __func__);
416
417
418 if (!mod_timer(&transport->proto_unreach_timer,
419 jiffies + (HZ/20)))
420 sctp_association_hold(asoc);
421 goto out_unlock;
422 }
423
424
425
426
427 if (asoc->base.dead)
428 goto out_unlock;
429
430 sctp_do_sm(net, SCTP_EVENT_T_OTHER,
431 SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH),
432 asoc->state, asoc->ep, asoc, transport, GFP_ATOMIC);
433
434out_unlock:
435 bh_unlock_sock(sk);
436 sctp_association_put(asoc);
437}
438
439
440void sctp_generate_reconf_event(unsigned long data)
441{
442 struct sctp_transport *transport = (struct sctp_transport *)data;
443 struct sctp_association *asoc = transport->asoc;
444 struct sock *sk = asoc->base.sk;
445 struct net *net = sock_net(sk);
446 int error = 0;
447
448 bh_lock_sock(sk);
449 if (sock_owned_by_user(sk)) {
450 pr_debug("%s: sock is busy\n", __func__);
451
452
453 if (!mod_timer(&transport->reconf_timer, jiffies + (HZ / 20)))
454 sctp_transport_hold(transport);
455 goto out_unlock;
456 }
457
458 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
459 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_RECONF),
460 asoc->state, asoc->ep, asoc,
461 transport, GFP_ATOMIC);
462
463 if (error)
464 sk->sk_err = -error;
465
466out_unlock:
467 bh_unlock_sock(sk);
468 sctp_transport_put(transport);
469}
470
471
472static void sctp_generate_sack_event(unsigned long data)
473{
474 struct sctp_association *asoc = (struct sctp_association *) data;
475 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK);
476}
477
478sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = {
479 NULL,
480 sctp_generate_t1_cookie_event,
481 sctp_generate_t1_init_event,
482 sctp_generate_t2_shutdown_event,
483 NULL,
484 sctp_generate_t4_rto_event,
485 sctp_generate_t5_shutdown_guard_event,
486 NULL,
487 NULL,
488 sctp_generate_sack_event,
489 sctp_generate_autoclose_event,
490};
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t *commands,
509 struct sctp_association *asoc,
510 struct sctp_transport *transport,
511 int is_hb)
512{
513 struct net *net = sock_net(asoc->base.sk);
514
515
516
517
518
519
520
521
522
523
524
525 if (!is_hb) {
526 asoc->overall_error_count++;
527 if (transport->state != SCTP_INACTIVE)
528 transport->error_count++;
529 } else if (transport->hb_sent) {
530 if (transport->state != SCTP_UNCONFIRMED)
531 asoc->overall_error_count++;
532 if (transport->state != SCTP_INACTIVE)
533 transport->error_count++;
534 }
535
536
537
538
539
540
541 if (net->sctp.pf_enable &&
542 (transport->state == SCTP_ACTIVE) &&
543 (asoc->pf_retrans < transport->pathmaxrxt) &&
544 (transport->error_count > asoc->pf_retrans)) {
545
546 sctp_assoc_control_transport(asoc, transport,
547 SCTP_TRANSPORT_PF,
548 0);
549
550
551 sctp_transport_reset_hb_timer(transport);
552 }
553
554 if (transport->state != SCTP_INACTIVE &&
555 (transport->error_count > transport->pathmaxrxt)) {
556 pr_debug("%s: association:%p transport addr:%pISpc failed\n",
557 __func__, asoc, &transport->ipaddr.sa);
558
559 sctp_assoc_control_transport(asoc, transport,
560 SCTP_TRANSPORT_DOWN,
561 SCTP_FAILED_THRESHOLD);
562 }
563
564
565
566
567
568
569
570
571
572
573 if (!is_hb || transport->hb_sent) {
574 transport->rto = min((transport->rto * 2), transport->asoc->rto_max);
575 sctp_max_rto(asoc, transport);
576 }
577}
578
579
580static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands,
581 struct sctp_association *asoc,
582 unsigned int error)
583{
584 struct sctp_ulpevent *event;
585
586 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_CANT_STR_ASSOC,
587 (__u16)error, 0, 0, NULL,
588 GFP_ATOMIC);
589
590 if (event)
591 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
592 SCTP_ULPEVENT(event));
593
594 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
595 SCTP_STATE(SCTP_STATE_CLOSED));
596
597
598 asoc->outqueue.error = error;
599 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
600}
601
602
603static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands,
604 struct sctp_association *asoc,
605 sctp_event_t event_type,
606 sctp_subtype_t subtype,
607 struct sctp_chunk *chunk,
608 unsigned int error)
609{
610 struct sctp_ulpevent *event;
611 struct sctp_chunk *abort;
612
613 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
614
615 if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT)
616 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
617 (__u16)error, 0, 0, chunk,
618 GFP_ATOMIC);
619 else
620 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
621 (__u16)error, 0, 0, NULL,
622 GFP_ATOMIC);
623 if (event)
624 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
625 SCTP_ULPEVENT(event));
626
627 if (asoc->overall_error_count >= asoc->max_retrans) {
628 abort = sctp_make_violation_max_retrans(asoc, chunk);
629 if (abort)
630 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
631 SCTP_CHUNK(abort));
632 }
633
634 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
635 SCTP_STATE(SCTP_STATE_CLOSED));
636
637
638 asoc->outqueue.error = error;
639 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
640}
641
642
643
644
645
646
647static int sctp_cmd_process_init(sctp_cmd_seq_t *commands,
648 struct sctp_association *asoc,
649 struct sctp_chunk *chunk,
650 struct sctp_init_chunk *peer_init,
651 gfp_t gfp)
652{
653 int error;
654
655
656
657
658
659
660 if (!sctp_process_init(asoc, chunk, sctp_source(chunk), peer_init, gfp))
661 error = -ENOMEM;
662 else
663 error = 0;
664
665 return error;
666}
667
668
669static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds,
670 struct sctp_association *asoc)
671{
672 struct sctp_transport *t;
673
674
675
676
677
678 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
679 sctp_transport_reset_hb_timer(t);
680}
681
682static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds,
683 struct sctp_association *asoc)
684{
685 struct sctp_transport *t;
686
687
688
689 list_for_each_entry(t, &asoc->peer.transport_addr_list,
690 transports) {
691 if (del_timer(&t->hb_timer))
692 sctp_transport_put(t);
693 }
694}
695
696
697static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds,
698 struct sctp_association *asoc)
699{
700 struct sctp_transport *t;
701
702 list_for_each_entry(t, &asoc->peer.transport_addr_list,
703 transports) {
704 if (del_timer(&t->T3_rtx_timer))
705 sctp_transport_put(t);
706 }
707}
708
709
710
711static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
712 struct sctp_association *asoc,
713 struct sctp_transport *t,
714 struct sctp_chunk *chunk)
715{
716 sctp_sender_hb_info_t *hbinfo;
717 int was_unconfirmed = 0;
718
719
720
721
722
723 t->error_count = 0;
724
725
726
727
728
729
730
731
732
733 if (t->asoc->state < SCTP_STATE_SHUTDOWN_PENDING)
734 t->asoc->overall_error_count = 0;
735
736
737
738
739 t->hb_sent = 0;
740
741
742
743
744 if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) {
745 was_unconfirmed = 1;
746 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
747 SCTP_HEARTBEAT_SUCCESS);
748 }
749
750 if (t->state == SCTP_PF)
751 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
752 SCTP_HEARTBEAT_SUCCESS);
753
754
755
756
757 if (t->dst)
758 sctp_transport_dst_confirm(t);
759
760
761
762
763
764
765
766
767 if (t->rto_pending == 0)
768 t->rto_pending = 1;
769
770 hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data;
771 sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at));
772
773
774 sctp_transport_reset_hb_timer(t);
775
776 if (was_unconfirmed && asoc->peer.transport_count == 1)
777 sctp_transport_immediate_rtx(t);
778}
779
780
781
782static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds,
783 struct sctp_association *asoc,
784 struct sctp_chunk *chunk)
785{
786 int err = 0;
787
788 if (sctp_outq_sack(&asoc->outqueue, chunk)) {
789 struct net *net = sock_net(asoc->base.sk);
790
791
792 err = sctp_do_sm(net, SCTP_EVENT_T_OTHER,
793 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN),
794 asoc->state, asoc->ep, asoc, NULL,
795 GFP_ATOMIC);
796 }
797
798 return err;
799}
800
801
802
803
804static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds,
805 struct sctp_association *asoc,
806 struct sctp_chunk *chunk)
807{
808 struct sctp_transport *t;
809
810 if (chunk->transport)
811 t = chunk->transport;
812 else {
813 t = sctp_assoc_choose_alter_transport(asoc,
814 asoc->shutdown_last_sent_to);
815 chunk->transport = t;
816 }
817 asoc->shutdown_last_sent_to = t;
818 asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto;
819}
820
821static void sctp_cmd_assoc_update(sctp_cmd_seq_t *cmds,
822 struct sctp_association *asoc,
823 struct sctp_association *new)
824{
825 struct net *net = sock_net(asoc->base.sk);
826 struct sctp_chunk *abort;
827
828 if (!sctp_assoc_update(asoc, new))
829 return;
830
831 abort = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t));
832 if (abort) {
833 sctp_init_cause(abort, SCTP_ERROR_RSRC_LOW, 0);
834 sctp_add_cmd_sf(cmds, SCTP_CMD_REPLY, SCTP_CHUNK(abort));
835 }
836 sctp_add_cmd_sf(cmds, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNABORTED));
837 sctp_add_cmd_sf(cmds, SCTP_CMD_ASSOC_FAILED,
838 SCTP_PERR(SCTP_ERROR_RSRC_LOW));
839 SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS);
840 SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB);
841}
842
843
844static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds,
845 struct sctp_association *asoc,
846 sctp_state_t state)
847{
848 struct sock *sk = asoc->base.sk;
849
850 asoc->state = state;
851
852 pr_debug("%s: asoc:%p[%s]\n", __func__, asoc, sctp_state_tbl[state]);
853
854 if (sctp_style(sk, TCP)) {
855
856
857
858 if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED))
859 sk->sk_state = SCTP_SS_ESTABLISHED;
860
861
862 if (sctp_state(asoc, SHUTDOWN_RECEIVED) &&
863 sctp_sstate(sk, ESTABLISHED)) {
864 sk->sk_state = SCTP_SS_CLOSING;
865 sk->sk_shutdown |= RCV_SHUTDOWN;
866 }
867 }
868
869 if (sctp_state(asoc, COOKIE_WAIT)) {
870
871
872
873 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
874 asoc->rto_initial;
875 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
876 asoc->rto_initial;
877 }
878
879 if (sctp_state(asoc, ESTABLISHED) ||
880 sctp_state(asoc, CLOSED) ||
881 sctp_state(asoc, SHUTDOWN_RECEIVED)) {
882
883
884
885 if (waitqueue_active(&asoc->wait))
886 wake_up_interruptible(&asoc->wait);
887
888
889
890
891
892
893
894 if (!sctp_style(sk, UDP))
895 sk->sk_state_change(sk);
896 }
897
898 if (sctp_state(asoc, SHUTDOWN_PENDING) &&
899 !sctp_outq_is_empty(&asoc->outqueue))
900 sctp_outq_uncork(&asoc->outqueue, GFP_ATOMIC);
901}
902
903
904static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds,
905 struct sctp_association *asoc)
906{
907 struct sock *sk = asoc->base.sk;
908
909
910
911
912
913 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) &&
914 (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK))
915 return;
916
917 sctp_association_free(asoc);
918}
919
920
921
922
923
924
925
926static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds,
927 struct sctp_association *asoc,
928 struct sctp_chunk *chunk)
929{
930 struct sctp_transport *t;
931
932 t = sctp_assoc_choose_alter_transport(asoc, chunk->transport);
933 asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto;
934 chunk->transport = t;
935}
936
937
938static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds,
939 struct sctp_association *asoc,
940 struct sctp_chunk *chunk)
941{
942 struct sctp_errhdr *err_hdr;
943 struct sctp_ulpevent *ev;
944
945 while (chunk->chunk_end > chunk->skb->data) {
946 err_hdr = (struct sctp_errhdr *)(chunk->skb->data);
947
948 ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0,
949 GFP_ATOMIC);
950 if (!ev)
951 return;
952
953 sctp_ulpq_tail_event(&asoc->ulpq, ev);
954
955 switch (err_hdr->cause) {
956 case SCTP_ERROR_UNKNOWN_CHUNK:
957 {
958 struct sctp_chunkhdr *unk_chunk_hdr;
959
960 unk_chunk_hdr = (struct sctp_chunkhdr *)
961 err_hdr->variable;
962 switch (unk_chunk_hdr->type) {
963
964
965
966
967
968
969 case SCTP_CID_ASCONF:
970 if (asoc->peer.asconf_capable == 0)
971 break;
972
973 asoc->peer.asconf_capable = 0;
974 sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP,
975 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO));
976 break;
977 default:
978 break;
979 }
980 break;
981 }
982 default:
983 break;
984 }
985 }
986}
987
988
989static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq,
990 struct sctp_chunk *chunk)
991{
992 struct sctp_fwdtsn_skip *skip;
993
994 sctp_walk_fwdtsn(skip, chunk) {
995 sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn));
996 }
997}
998
999
1000
1001
1002static void sctp_cmd_del_non_primary(struct sctp_association *asoc)
1003{
1004 struct sctp_transport *t;
1005 struct list_head *pos;
1006 struct list_head *temp;
1007
1008 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
1009 t = list_entry(pos, struct sctp_transport, transports);
1010 if (!sctp_cmp_addr_exact(&t->ipaddr,
1011 &asoc->peer.primary_addr)) {
1012 sctp_assoc_rm_peer(asoc, t);
1013 }
1014 }
1015}
1016
1017
1018static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error)
1019{
1020 struct sock *sk = asoc->base.sk;
1021
1022 if (!sctp_style(sk, UDP))
1023 sk->sk_err = error;
1024}
1025
1026
1027static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands,
1028 struct sctp_association *asoc,
1029 u8 state)
1030{
1031 struct sctp_ulpevent *ev;
1032
1033 ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0,
1034 asoc->c.sinit_num_ostreams,
1035 asoc->c.sinit_max_instreams,
1036 NULL, GFP_ATOMIC);
1037 if (ev)
1038 sctp_ulpq_tail_event(&asoc->ulpq, ev);
1039}
1040
1041
1042static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands,
1043 struct sctp_association *asoc)
1044{
1045 struct sctp_ulpevent *ev;
1046
1047 ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC);
1048
1049 if (ev)
1050 sctp_ulpq_tail_event(&asoc->ulpq, ev);
1051}
1052
1053
1054static void sctp_cmd_t1_timer_update(struct sctp_association *asoc,
1055 sctp_event_timeout_t timer,
1056 char *name)
1057{
1058 struct sctp_transport *t;
1059
1060 t = asoc->init_last_sent_to;
1061 asoc->init_err_counter++;
1062
1063 if (t->init_sent_count > (asoc->init_cycle + 1)) {
1064 asoc->timeouts[timer] *= 2;
1065 if (asoc->timeouts[timer] > asoc->max_init_timeo) {
1066 asoc->timeouts[timer] = asoc->max_init_timeo;
1067 }
1068 asoc->init_cycle++;
1069
1070 pr_debug("%s: T1[%s] timeout adjustment init_err_counter:%d"
1071 " cycle:%d timeout:%ld\n", __func__, name,
1072 asoc->init_err_counter, asoc->init_cycle,
1073 asoc->timeouts[timer]);
1074 }
1075
1076}
1077
1078
1079
1080
1081
1082static void sctp_cmd_send_msg(struct sctp_association *asoc,
1083 struct sctp_datamsg *msg, gfp_t gfp)
1084{
1085 struct sctp_chunk *chunk;
1086
1087 list_for_each_entry(chunk, &msg->chunks, frag_list)
1088 sctp_outq_tail(&asoc->outqueue, chunk, gfp);
1089}
1090
1091
1092
1093
1094
1095static void sctp_cmd_send_asconf(struct sctp_association *asoc)
1096{
1097 struct net *net = sock_net(asoc->base.sk);
1098
1099
1100
1101
1102 if (!list_empty(&asoc->addip_chunk_list)) {
1103 struct list_head *entry = asoc->addip_chunk_list.next;
1104 struct sctp_chunk *asconf = list_entry(entry,
1105 struct sctp_chunk, list);
1106 list_del_init(entry);
1107
1108
1109 sctp_chunk_hold(asconf);
1110 if (sctp_primitive_ASCONF(net, asoc, asconf))
1111 sctp_chunk_free(asconf);
1112 else
1113 asoc->addip_last_asconf = asconf;
1114 }
1115}
1116
1117
1118
1119
1120
1121
1122#define debug_pre_sfn() \
1123 pr_debug("%s[pre-fn]: ep:%p, %s, %s, asoc:%p[%s], %s\n", __func__, \
1124 ep, sctp_evttype_tbl[event_type], (*debug_fn)(subtype), \
1125 asoc, sctp_state_tbl[state], state_fn->name)
1126
1127#define debug_post_sfn() \
1128 pr_debug("%s[post-fn]: asoc:%p, status:%s\n", __func__, asoc, \
1129 sctp_status_tbl[status])
1130
1131#define debug_post_sfx() \
1132 pr_debug("%s[post-sfx]: error:%d, asoc:%p[%s]\n", __func__, error, \
1133 asoc, sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
1134 sctp_assoc2id(asoc))) ? asoc->state : SCTP_STATE_CLOSED])
1135
1136
1137
1138
1139
1140
1141
1142int sctp_do_sm(struct net *net, sctp_event_t event_type, sctp_subtype_t subtype,
1143 sctp_state_t state,
1144 struct sctp_endpoint *ep,
1145 struct sctp_association *asoc,
1146 void *event_arg,
1147 gfp_t gfp)
1148{
1149 sctp_cmd_seq_t commands;
1150 const sctp_sm_table_entry_t *state_fn;
1151 sctp_disposition_t status;
1152 int error = 0;
1153 typedef const char *(printfn_t)(sctp_subtype_t);
1154 static printfn_t *table[] = {
1155 NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname,
1156 };
1157 printfn_t *debug_fn __attribute__ ((unused)) = table[event_type];
1158
1159
1160
1161
1162 state_fn = sctp_sm_lookup_event(net, event_type, state, subtype);
1163
1164 sctp_init_cmd_seq(&commands);
1165
1166 debug_pre_sfn();
1167 status = state_fn->fn(net, ep, asoc, subtype, event_arg, &commands);
1168 debug_post_sfn();
1169
1170 error = sctp_side_effects(event_type, subtype, state,
1171 ep, &asoc, event_arg, status,
1172 &commands, gfp);
1173 debug_post_sfx();
1174
1175 return error;
1176}
1177
1178
1179
1180
1181static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
1182 sctp_state_t state,
1183 struct sctp_endpoint *ep,
1184 struct sctp_association **asoc,
1185 void *event_arg,
1186 sctp_disposition_t status,
1187 sctp_cmd_seq_t *commands,
1188 gfp_t gfp)
1189{
1190 int error;
1191
1192
1193
1194
1195
1196
1197
1198 if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state,
1199 ep, *asoc,
1200 event_arg, status,
1201 commands, gfp)))
1202 goto bail;
1203
1204 switch (status) {
1205 case SCTP_DISPOSITION_DISCARD:
1206 pr_debug("%s: ignored sctp protocol event - state:%d, "
1207 "event_type:%d, event_id:%d\n", __func__, state,
1208 event_type, subtype.chunk);
1209 break;
1210
1211 case SCTP_DISPOSITION_NOMEM:
1212
1213
1214
1215
1216
1217
1218 error = -ENOMEM;
1219 break;
1220
1221 case SCTP_DISPOSITION_DELETE_TCB:
1222 case SCTP_DISPOSITION_ABORT:
1223
1224 *asoc = NULL;
1225 break;
1226
1227 case SCTP_DISPOSITION_CONSUME:
1228
1229
1230
1231
1232 break;
1233
1234 case SCTP_DISPOSITION_VIOLATION:
1235 net_err_ratelimited("protocol violation state %d chunkid %d\n",
1236 state, subtype.chunk);
1237 break;
1238
1239 case SCTP_DISPOSITION_NOT_IMPL:
1240 pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n",
1241 state, event_type, subtype.chunk);
1242 break;
1243
1244 case SCTP_DISPOSITION_BUG:
1245 pr_err("bug in state %d, event_type %d, event_id %d\n",
1246 state, event_type, subtype.chunk);
1247 BUG();
1248 break;
1249
1250 default:
1251 pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n",
1252 status, state, event_type, subtype.chunk);
1253 BUG();
1254 break;
1255 }
1256
1257bail:
1258 return error;
1259}
1260
1261
1262
1263
1264
1265
1266static int sctp_cmd_interpreter(sctp_event_t event_type,
1267 sctp_subtype_t subtype,
1268 sctp_state_t state,
1269 struct sctp_endpoint *ep,
1270 struct sctp_association *asoc,
1271 void *event_arg,
1272 sctp_disposition_t status,
1273 sctp_cmd_seq_t *commands,
1274 gfp_t gfp)
1275{
1276 struct sock *sk = ep->base.sk;
1277 struct sctp_sock *sp = sctp_sk(sk);
1278 int error = 0;
1279 int force;
1280 sctp_cmd_t *cmd;
1281 struct sctp_chunk *new_obj;
1282 struct sctp_chunk *chunk = NULL;
1283 struct sctp_packet *packet;
1284 struct timer_list *timer;
1285 unsigned long timeout;
1286 struct sctp_transport *t;
1287 struct sctp_sackhdr sackh;
1288 int local_cork = 0;
1289
1290 if (SCTP_EVENT_T_TIMEOUT != event_type)
1291 chunk = event_arg;
1292
1293
1294
1295
1296
1297
1298
1299
1300 while (NULL != (cmd = sctp_next_cmd(commands))) {
1301 switch (cmd->verb) {
1302 case SCTP_CMD_NOP:
1303
1304 break;
1305
1306 case SCTP_CMD_NEW_ASOC:
1307
1308 if (local_cork) {
1309 sctp_outq_uncork(&asoc->outqueue, gfp);
1310 local_cork = 0;
1311 }
1312
1313
1314 asoc = cmd->obj.asoc;
1315 BUG_ON(asoc->peer.primary_path == NULL);
1316 sctp_endpoint_add_asoc(ep, asoc);
1317 break;
1318
1319 case SCTP_CMD_UPDATE_ASSOC:
1320 sctp_cmd_assoc_update(commands, asoc, cmd->obj.asoc);
1321 break;
1322
1323 case SCTP_CMD_PURGE_OUTQUEUE:
1324 sctp_outq_teardown(&asoc->outqueue);
1325 break;
1326
1327 case SCTP_CMD_DELETE_TCB:
1328 if (local_cork) {
1329 sctp_outq_uncork(&asoc->outqueue, gfp);
1330 local_cork = 0;
1331 }
1332
1333 sctp_cmd_delete_tcb(commands, asoc);
1334 asoc = NULL;
1335 break;
1336
1337 case SCTP_CMD_NEW_STATE:
1338
1339 sctp_cmd_new_state(commands, asoc, cmd->obj.state);
1340 break;
1341
1342 case SCTP_CMD_REPORT_TSN:
1343
1344 error = sctp_tsnmap_mark(&asoc->peer.tsn_map,
1345 cmd->obj.u32, NULL);
1346 break;
1347
1348 case SCTP_CMD_REPORT_FWDTSN:
1349
1350 sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32);
1351
1352
1353 sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32);
1354
1355
1356 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
1357 break;
1358
1359 case SCTP_CMD_PROCESS_FWDTSN:
1360 sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.chunk);
1361 break;
1362
1363 case SCTP_CMD_GEN_SACK:
1364
1365
1366
1367
1368
1369 force = cmd->obj.i32;
1370 error = sctp_gen_sack(asoc, force, commands);
1371 break;
1372
1373 case SCTP_CMD_PROCESS_SACK:
1374
1375 error = sctp_cmd_process_sack(commands, asoc,
1376 cmd->obj.chunk);
1377 break;
1378
1379 case SCTP_CMD_GEN_INIT_ACK:
1380
1381 new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC,
1382 0);
1383 if (!new_obj)
1384 goto nomem;
1385
1386 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1387 SCTP_CHUNK(new_obj));
1388 break;
1389
1390 case SCTP_CMD_PEER_INIT:
1391
1392
1393
1394
1395
1396 error = sctp_cmd_process_init(commands, asoc, chunk,
1397 cmd->obj.init, gfp);
1398 break;
1399
1400 case SCTP_CMD_GEN_COOKIE_ECHO:
1401
1402 new_obj = sctp_make_cookie_echo(asoc, chunk);
1403 if (!new_obj) {
1404 if (cmd->obj.chunk)
1405 sctp_chunk_free(cmd->obj.chunk);
1406 goto nomem;
1407 }
1408 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1409 SCTP_CHUNK(new_obj));
1410
1411
1412
1413
1414 if (cmd->obj.chunk)
1415 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1416 SCTP_CHUNK(cmd->obj.chunk));
1417
1418 if (new_obj->transport) {
1419 new_obj->transport->init_sent_count++;
1420 asoc->init_last_sent_to = new_obj->transport;
1421 }
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435 if ((asoc->peer.retran_path !=
1436 asoc->peer.primary_path) &&
1437 (asoc->init_err_counter > 0)) {
1438 sctp_add_cmd_sf(commands,
1439 SCTP_CMD_FORCE_PRIM_RETRAN,
1440 SCTP_NULL());
1441 }
1442
1443 break;
1444
1445 case SCTP_CMD_GEN_SHUTDOWN:
1446
1447
1448
1449 asoc->overall_error_count = 0;
1450
1451
1452 new_obj = sctp_make_shutdown(asoc, chunk);
1453 if (!new_obj)
1454 goto nomem;
1455 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1456 SCTP_CHUNK(new_obj));
1457 break;
1458
1459 case SCTP_CMD_CHUNK_ULP:
1460
1461 pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n",
1462 __func__, cmd->obj.chunk, &asoc->ulpq);
1463
1464 sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.chunk,
1465 GFP_ATOMIC);
1466 break;
1467
1468 case SCTP_CMD_EVENT_ULP:
1469
1470 pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n",
1471 __func__, cmd->obj.ulpevent, &asoc->ulpq);
1472
1473 sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ulpevent);
1474 break;
1475
1476 case SCTP_CMD_REPLY:
1477
1478 if (!asoc->outqueue.cork) {
1479 sctp_outq_cork(&asoc->outqueue);
1480 local_cork = 1;
1481 }
1482
1483 sctp_outq_tail(&asoc->outqueue, cmd->obj.chunk, gfp);
1484 break;
1485
1486 case SCTP_CMD_SEND_PKT:
1487
1488 packet = cmd->obj.packet;
1489 sctp_packet_transmit(packet, gfp);
1490 sctp_ootb_pkt_free(packet);
1491 break;
1492
1493 case SCTP_CMD_T1_RETRAN:
1494
1495 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1496 SCTP_RTXR_T1_RTX);
1497 break;
1498
1499 case SCTP_CMD_RETRAN:
1500
1501 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1502 SCTP_RTXR_T3_RTX);
1503 break;
1504
1505 case SCTP_CMD_ECN_CE:
1506
1507 sctp_do_ecn_ce_work(asoc, cmd->obj.u32);
1508 break;
1509
1510 case SCTP_CMD_ECN_ECNE:
1511
1512 new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32,
1513 chunk);
1514 if (new_obj)
1515 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1516 SCTP_CHUNK(new_obj));
1517 break;
1518
1519 case SCTP_CMD_ECN_CWR:
1520
1521 sctp_do_ecn_cwr_work(asoc, cmd->obj.u32);
1522 break;
1523
1524 case SCTP_CMD_SETUP_T2:
1525 sctp_cmd_setup_t2(commands, asoc, cmd->obj.chunk);
1526 break;
1527
1528 case SCTP_CMD_TIMER_START_ONCE:
1529 timer = &asoc->timers[cmd->obj.to];
1530
1531 if (timer_pending(timer))
1532 break;
1533
1534
1535 case SCTP_CMD_TIMER_START:
1536 timer = &asoc->timers[cmd->obj.to];
1537 timeout = asoc->timeouts[cmd->obj.to];
1538 BUG_ON(!timeout);
1539
1540 timer->expires = jiffies + timeout;
1541 sctp_association_hold(asoc);
1542 add_timer(timer);
1543 break;
1544
1545 case SCTP_CMD_TIMER_RESTART:
1546 timer = &asoc->timers[cmd->obj.to];
1547 timeout = asoc->timeouts[cmd->obj.to];
1548 if (!mod_timer(timer, jiffies + timeout))
1549 sctp_association_hold(asoc);
1550 break;
1551
1552 case SCTP_CMD_TIMER_STOP:
1553 timer = &asoc->timers[cmd->obj.to];
1554 if (del_timer(timer))
1555 sctp_association_put(asoc);
1556 break;
1557
1558 case SCTP_CMD_INIT_CHOOSE_TRANSPORT:
1559 chunk = cmd->obj.chunk;
1560 t = sctp_assoc_choose_alter_transport(asoc,
1561 asoc->init_last_sent_to);
1562 asoc->init_last_sent_to = t;
1563 chunk->transport = t;
1564 t->init_sent_count++;
1565
1566 sctp_assoc_set_primary(asoc, t);
1567 break;
1568
1569 case SCTP_CMD_INIT_RESTART:
1570
1571
1572
1573
1574
1575
1576 sctp_cmd_t1_timer_update(asoc,
1577 SCTP_EVENT_TIMEOUT_T1_INIT,
1578 "INIT");
1579
1580 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
1581 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
1582 break;
1583
1584 case SCTP_CMD_COOKIEECHO_RESTART:
1585
1586
1587
1588
1589
1590
1591 sctp_cmd_t1_timer_update(asoc,
1592 SCTP_EVENT_TIMEOUT_T1_COOKIE,
1593 "COOKIE");
1594
1595
1596
1597
1598 list_for_each_entry(t, &asoc->peer.transport_addr_list,
1599 transports) {
1600 sctp_retransmit_mark(&asoc->outqueue, t,
1601 SCTP_RTXR_T1_RTX);
1602 }
1603
1604 sctp_add_cmd_sf(commands,
1605 SCTP_CMD_TIMER_RESTART,
1606 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE));
1607 break;
1608
1609 case SCTP_CMD_INIT_FAILED:
1610 sctp_cmd_init_failed(commands, asoc, cmd->obj.err);
1611 break;
1612
1613 case SCTP_CMD_ASSOC_FAILED:
1614 sctp_cmd_assoc_failed(commands, asoc, event_type,
1615 subtype, chunk, cmd->obj.err);
1616 break;
1617
1618 case SCTP_CMD_INIT_COUNTER_INC:
1619 asoc->init_err_counter++;
1620 break;
1621
1622 case SCTP_CMD_INIT_COUNTER_RESET:
1623 asoc->init_err_counter = 0;
1624 asoc->init_cycle = 0;
1625 list_for_each_entry(t, &asoc->peer.transport_addr_list,
1626 transports) {
1627 t->init_sent_count = 0;
1628 }
1629 break;
1630
1631 case SCTP_CMD_REPORT_DUP:
1632 sctp_tsnmap_mark_dup(&asoc->peer.tsn_map,
1633 cmd->obj.u32);
1634 break;
1635
1636 case SCTP_CMD_REPORT_BAD_TAG:
1637 pr_debug("%s: vtag mismatch!\n", __func__);
1638 break;
1639
1640 case SCTP_CMD_STRIKE:
1641
1642 sctp_do_8_2_transport_strike(commands, asoc,
1643 cmd->obj.transport, 0);
1644 break;
1645
1646 case SCTP_CMD_TRANSPORT_IDLE:
1647 t = cmd->obj.transport;
1648 sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE);
1649 break;
1650
1651 case SCTP_CMD_TRANSPORT_HB_SENT:
1652 t = cmd->obj.transport;
1653 sctp_do_8_2_transport_strike(commands, asoc,
1654 t, 1);
1655 t->hb_sent = 1;
1656 break;
1657
1658 case SCTP_CMD_TRANSPORT_ON:
1659 t = cmd->obj.transport;
1660 sctp_cmd_transport_on(commands, asoc, t, chunk);
1661 break;
1662
1663 case SCTP_CMD_HB_TIMERS_START:
1664 sctp_cmd_hb_timers_start(commands, asoc);
1665 break;
1666
1667 case SCTP_CMD_HB_TIMER_UPDATE:
1668 t = cmd->obj.transport;
1669 sctp_transport_reset_hb_timer(t);
1670 break;
1671
1672 case SCTP_CMD_HB_TIMERS_STOP:
1673 sctp_cmd_hb_timers_stop(commands, asoc);
1674 break;
1675
1676 case SCTP_CMD_REPORT_ERROR:
1677 error = cmd->obj.error;
1678 break;
1679
1680 case SCTP_CMD_PROCESS_CTSN:
1681
1682 sackh.cum_tsn_ack = cmd->obj.be32;
1683 sackh.a_rwnd = asoc->peer.rwnd +
1684 asoc->outqueue.outstanding_bytes;
1685 sackh.num_gap_ack_blocks = 0;
1686 sackh.num_dup_tsns = 0;
1687 chunk->subh.sack_hdr = &sackh;
1688 sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK,
1689 SCTP_CHUNK(chunk));
1690 break;
1691
1692 case SCTP_CMD_DISCARD_PACKET:
1693
1694
1695
1696
1697 chunk->pdiscard = 1;
1698 if (asoc) {
1699 sctp_outq_uncork(&asoc->outqueue, gfp);
1700 local_cork = 0;
1701 }
1702 break;
1703
1704 case SCTP_CMD_RTO_PENDING:
1705 t = cmd->obj.transport;
1706 t->rto_pending = 1;
1707 break;
1708
1709 case SCTP_CMD_PART_DELIVER:
1710 sctp_ulpq_partial_delivery(&asoc->ulpq, GFP_ATOMIC);
1711 break;
1712
1713 case SCTP_CMD_RENEGE:
1714 sctp_ulpq_renege(&asoc->ulpq, cmd->obj.chunk,
1715 GFP_ATOMIC);
1716 break;
1717
1718 case SCTP_CMD_SETUP_T4:
1719 sctp_cmd_setup_t4(commands, asoc, cmd->obj.chunk);
1720 break;
1721
1722 case SCTP_CMD_PROCESS_OPERR:
1723 sctp_cmd_process_operr(commands, asoc, chunk);
1724 break;
1725 case SCTP_CMD_CLEAR_INIT_TAG:
1726 asoc->peer.i.init_tag = 0;
1727 break;
1728 case SCTP_CMD_DEL_NON_PRIMARY:
1729 sctp_cmd_del_non_primary(asoc);
1730 break;
1731 case SCTP_CMD_T3_RTX_TIMERS_STOP:
1732 sctp_cmd_t3_rtx_timers_stop(commands, asoc);
1733 break;
1734 case SCTP_CMD_FORCE_PRIM_RETRAN:
1735 t = asoc->peer.retran_path;
1736 asoc->peer.retran_path = asoc->peer.primary_path;
1737 sctp_outq_uncork(&asoc->outqueue, gfp);
1738 local_cork = 0;
1739 asoc->peer.retran_path = t;
1740 break;
1741 case SCTP_CMD_SET_SK_ERR:
1742 sctp_cmd_set_sk_err(asoc, cmd->obj.error);
1743 break;
1744 case SCTP_CMD_ASSOC_CHANGE:
1745 sctp_cmd_assoc_change(commands, asoc,
1746 cmd->obj.u8);
1747 break;
1748 case SCTP_CMD_ADAPTATION_IND:
1749 sctp_cmd_adaptation_ind(commands, asoc);
1750 break;
1751
1752 case SCTP_CMD_ASSOC_SHKEY:
1753 error = sctp_auth_asoc_init_active_key(asoc,
1754 GFP_ATOMIC);
1755 break;
1756 case SCTP_CMD_UPDATE_INITTAG:
1757 asoc->peer.i.init_tag = cmd->obj.u32;
1758 break;
1759 case SCTP_CMD_SEND_MSG:
1760 if (!asoc->outqueue.cork) {
1761 sctp_outq_cork(&asoc->outqueue);
1762 local_cork = 1;
1763 }
1764 sctp_cmd_send_msg(asoc, cmd->obj.msg, gfp);
1765 break;
1766 case SCTP_CMD_SEND_NEXT_ASCONF:
1767 sctp_cmd_send_asconf(asoc);
1768 break;
1769 case SCTP_CMD_PURGE_ASCONF_QUEUE:
1770 sctp_asconf_queue_teardown(asoc);
1771 break;
1772
1773 case SCTP_CMD_SET_ASOC:
1774 if (asoc && local_cork) {
1775 sctp_outq_uncork(&asoc->outqueue, gfp);
1776 local_cork = 0;
1777 }
1778 asoc = cmd->obj.asoc;
1779 break;
1780
1781 default:
1782 pr_warn("Impossible command: %u\n",
1783 cmd->verb);
1784 break;
1785 }
1786
1787 if (error)
1788 break;
1789 }
1790
1791out:
1792
1793
1794
1795
1796 if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) {
1797 if (chunk->end_of_packet || chunk->singleton)
1798 sctp_outq_uncork(&asoc->outqueue, gfp);
1799 } else if (local_cork)
1800 sctp_outq_uncork(&asoc->outqueue, gfp);
1801
1802 if (sp->data_ready_signalled)
1803 sp->data_ready_signalled = 0;
1804
1805 return error;
1806nomem:
1807 error = -ENOMEM;
1808 goto out;
1809}
1810
1811