sctp: sctp should change socket state when shutdown is received
[deliverable/linux.git] / net / sctp / sm_sideeffect.c
CommitLineData
60c778b2 1/* SCTP kernel implementation
1da177e4
LT
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 *
60c778b2 6 * This file is part of the SCTP kernel implementation
1da177e4
LT
7 *
8 * These functions work with the state functions in sctp_sm_statefuns.c
9 * to implement that state operations. These functions implement the
10 * steps which require modifying existing data structures.
11 *
60c778b2 12 * This SCTP implementation is free software;
1da177e4
LT
13 * you can redistribute it and/or modify it under the terms of
14 * the GNU General Public License as published by
15 * the Free Software Foundation; either version 2, or (at your option)
16 * any later version.
17 *
60c778b2 18 * This SCTP implementation is distributed in the hope that it
1da177e4
LT
19 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
20 * ************************
21 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
22 * See the GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
4b2f13a2
JK
25 * along with GNU CC; see the file COPYING. If not, see
26 * <http://www.gnu.org/licenses/>.
1da177e4
LT
27 *
28 * Please send any bug reports or fixes you make to the
29 * email address(es):
91705c61 30 * lksctp developers <linux-sctp@vger.kernel.org>
1da177e4 31 *
1da177e4
LT
32 * Written or modified by:
33 * La Monte H.P. Yarroll <piggy@acm.org>
34 * Karl Knutson <karl@athena.chicago.il.us>
35 * Jon Grimm <jgrimm@austin.ibm.com>
36 * Hui Huang <hui.huang@nokia.com>
37 * Dajiang Zhang <dajiang.zhang@nokia.com>
38 * Daisy Chang <daisyc@us.ibm.com>
39 * Sridhar Samudrala <sri@us.ibm.com>
40 * Ardelle Fan <ardelle.fan@intel.com>
1da177e4
LT
41 */
42
145ce502
JP
43#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
44
1da177e4
LT
45#include <linux/skbuff.h>
46#include <linux/types.h>
47#include <linux/socket.h>
48#include <linux/ip.h>
5a0e3ad6 49#include <linux/gfp.h>
1da177e4
LT
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,
d808ad9a 60 sctp_disposition_t status,
1da177e4 61 sctp_cmd_seq_t *commands,
dd0fc66f 62 gfp_t gfp);
1da177e4
LT
63static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
64 sctp_state_t state,
65 struct sctp_endpoint *ep,
649621e3 66 struct sctp_association **asoc,
1da177e4
LT
67 void *event_arg,
68 sctp_disposition_t status,
69 sctp_cmd_seq_t *commands,
dd0fc66f 70 gfp_t gfp);
1da177e4
LT
71
72/********************************************************************
73 * Helper functions
74 ********************************************************************/
75
76/* A helper function for delayed processing of INET ECN CE bit. */
d808ad9a 77static void sctp_do_ecn_ce_work(struct sctp_association *asoc,
1da177e4
LT
78 __u32 lowest_tsn)
79{
80 /* Save the TSN away for comparison when we receive CWR */
81
82 asoc->last_ecne_tsn = lowest_tsn;
83 asoc->need_ecne = 1;
84}
85
86/* Helper function for delayed processing of SCTP ECNE chunk. */
87/* RFC 2960 Appendix A
88 *
89 * RFC 2481 details a specific bit for a sender to send in
90 * the header of its next outbound TCP segment to indicate to
91 * its peer that it has reduced its congestion window. This
92 * is termed the CWR bit. For SCTP the same indication is made
93 * by including the CWR chunk. This chunk contains one data
94 * element, i.e. the TSN number that was sent in the ECNE chunk.
95 * This element represents the lowest TSN number in the datagram
96 * that was originally marked with the CE bit.
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 /* Our previously transmitted packet ran into some congestion
105 * so we should take action by reducing cwnd and ssthresh
106 * and then ACK our peer that we we've done so by
107 * sending a CWR.
108 */
109
110 /* First, try to determine if we want to actually lower
111 * our cwnd variables. Only lower them if the ECNE looks more
112 * recent than the last response.
113 */
114 if (TSN_lt(asoc->last_cwr_tsn, lowest_tsn)) {
115 struct sctp_transport *transport;
116
117 /* Find which transport's congestion variables
118 * need to be adjusted.
119 */
120 transport = sctp_assoc_lookup_tsn(asoc, lowest_tsn);
121
122 /* Update the congestion variables. */
123 if (transport)
124 sctp_transport_lower_cwnd(transport,
125 SCTP_LOWER_CWND_ECNE);
126 asoc->last_cwr_tsn = lowest_tsn;
127 }
128
129 /* Always try to quiet the other end. In case of lost CWR,
130 * resend last_cwr_tsn.
131 */
132 repl = sctp_make_cwr(asoc, asoc->last_cwr_tsn, chunk);
133
134 /* If we run out of memory, it will look like a lost CWR. We'll
135 * get back in sync eventually.
136 */
137 return repl;
138}
139
140/* Helper function to do delayed processing of ECN CWR chunk. */
141static void sctp_do_ecn_cwr_work(struct sctp_association *asoc,
142 __u32 lowest_tsn)
143{
144 /* Turn off ECNE getting auto-prepended to every outgoing
145 * packet
146 */
147 asoc->need_ecne = 0;
148}
149
150/* Generate SACK if necessary. We call this at the end of a packet. */
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;
52ccb8e9 156 struct sctp_transport *trans = asoc->peer.last_data_from;
1da177e4
LT
157 int error = 0;
158
d808ad9a 159 if (force ||
52ccb8e9
FF
160 (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) ||
161 (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE)))
1da177e4
LT
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 /* From 12.2 Parameters necessary per association (i.e. the TCB):
168 *
169 * Ack State : This flag indicates if the next received packet
170 * : is to be responded to with a SACK. ...
171 * : When DATA chunks are out of order, SACK's
172 * : are not delayed (see Section 6).
173 *
174 * [This is actually not mentioned in Section 6, but we
175 * implement it here anyway. --piggy]
176 */
d808ad9a 177 if (max_tsn_seen != ctsn)
1da177e4
LT
178 asoc->peer.sack_needed = 1;
179
180 /* From 6.2 Acknowledgement on Reception of DATA Chunks:
181 *
182 * Section 4.2 of [RFC2581] SHOULD be followed. Specifically,
183 * an acknowledgement SHOULD be generated for at least every
184 * second packet (not every second DATA chunk) received, and
185 * SHOULD be generated within 200 ms of the arrival of any
186 * unacknowledged DATA chunk. ...
187 */
188 if (!asoc->peer.sack_needed) {
d364d927 189 asoc->peer.sack_cnt++;
52ccb8e9
FF
190
191 /* Set the SACK delay timeout based on the
192 * SACK delay for the last transport
193 * data was received from, or the default
194 * for the association.
195 */
d364d927
WY
196 if (trans) {
197 /* We will need a SACK for the next packet. */
198 if (asoc->peer.sack_cnt >= trans->sackfreq - 1)
199 asoc->peer.sack_needed = 1;
200
d808ad9a 201 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
52ccb8e9 202 trans->sackdelay;
d364d927
WY
203 } else {
204 /* We will need a SACK for the next packet. */
205 if (asoc->peer.sack_cnt >= asoc->sackfreq - 1)
206 asoc->peer.sack_needed = 1;
207
d808ad9a 208 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
52ccb8e9 209 asoc->sackdelay;
d364d927 210 }
52ccb8e9
FF
211
212 /* Restart the SACK timer. */
213 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
214 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
1da177e4 215 } else {
07b4d6a1
MRL
216 __u32 old_a_rwnd = asoc->a_rwnd;
217
90f2f531 218 asoc->a_rwnd = asoc->rwnd;
1da177e4 219 sack = sctp_make_sack(asoc);
07b4d6a1
MRL
220 if (!sack) {
221 asoc->a_rwnd = old_a_rwnd;
1da177e4 222 goto nomem;
07b4d6a1 223 }
1da177e4
LT
224
225 asoc->peer.sack_needed = 0;
d364d927 226 asoc->peer.sack_cnt = 0;
1da177e4 227
732ba35e 228 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack));
1da177e4
LT
229
230 /* Stop the SACK timer. */
231 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
232 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
233 }
52ccb8e9 234
1da177e4
LT
235 return error;
236nomem:
237 error = -ENOMEM;
238 return error;
239}
240
241/* When the T3-RTX timer expires, it calls this function to create the
242 * relevant state machine event.
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;
635682a1
KH
249 struct sock *sk = asoc->base.sk;
250 struct net *net = sock_net(sk);
1da177e4
LT
251
252 /* Check whether a task is in the sock. */
253
635682a1
KH
254 bh_lock_sock(sk);
255 if (sock_owned_by_user(sk)) {
bb33381d 256 pr_debug("%s: sock is busy\n", __func__);
1da177e4
LT
257
258 /* Try again later. */
259 if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20)))
260 sctp_transport_hold(transport);
261 goto out_unlock;
262 }
263
1da177e4 264 /* Run through the state machine. */
55e26eb9 265 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
1da177e4
LT
266 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX),
267 asoc->state,
268 asoc->ep, asoc,
269 transport, GFP_ATOMIC);
270
271 if (error)
635682a1 272 sk->sk_err = -error;
1da177e4
LT
273
274out_unlock:
635682a1 275 bh_unlock_sock(sk);
1da177e4
LT
276 sctp_transport_put(transport);
277}
278
279/* This is a sa interface for producing timeout events. It works
280 * for timeouts which use the association as their parameter.
281 */
282static void sctp_generate_timeout_event(struct sctp_association *asoc,
283 sctp_event_timeout_t timeout_type)
284{
635682a1
KH
285 struct sock *sk = asoc->base.sk;
286 struct net *net = sock_net(sk);
1da177e4
LT
287 int error = 0;
288
635682a1
KH
289 bh_lock_sock(sk);
290 if (sock_owned_by_user(sk)) {
bb33381d
DB
291 pr_debug("%s: sock is busy: timer %d\n", __func__,
292 timeout_type);
1da177e4
LT
293
294 /* Try again later. */
295 if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20)))
296 sctp_association_hold(asoc);
297 goto out_unlock;
298 }
299
300 /* Is this association really dead and just waiting around for
301 * the timer to let go of the reference?
302 */
303 if (asoc->base.dead)
304 goto out_unlock;
305
306 /* Run through the state machine. */
55e26eb9 307 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
1da177e4
LT
308 SCTP_ST_TIMEOUT(timeout_type),
309 asoc->state, asoc->ep, asoc,
310 (void *)timeout_type, GFP_ATOMIC);
311
312 if (error)
635682a1 313 sk->sk_err = -error;
1da177e4
LT
314
315out_unlock:
635682a1 316 bh_unlock_sock(sk);
1da177e4
LT
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{
d808ad9a
YH
346 struct sctp_association *asoc = (struct sctp_association *)data;
347 sctp_generate_timeout_event(asoc,
1da177e4
LT
348 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD);
349
350} /* sctp_generate_t5_shutdown_guard_event() */
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/* Generate a heart beat event. If the sock is busy, reschedule. Make
359 * sure that the transport is still valid.
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;
635682a1
KH
366 struct sock *sk = asoc->base.sk;
367 struct net *net = sock_net(sk);
ba6f5e33 368 u32 elapsed, timeout;
1da177e4 369
635682a1
KH
370 bh_lock_sock(sk);
371 if (sock_owned_by_user(sk)) {
bb33381d 372 pr_debug("%s: sock is busy\n", __func__);
1da177e4
LT
373
374 /* Try again later. */
375 if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20)))
376 sctp_transport_hold(transport);
377 goto out_unlock;
378 }
379
ba6f5e33
MRL
380 /* Check if we should still send the heartbeat or reschedule */
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
55e26eb9 390 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
1da177e4
LT
391 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT),
392 asoc->state, asoc->ep, asoc,
393 transport, GFP_ATOMIC);
394
f05940e6 395 if (error)
635682a1 396 sk->sk_err = -error;
1da177e4
LT
397
398out_unlock:
635682a1 399 bh_unlock_sock(sk);
1da177e4
LT
400 sctp_transport_put(transport);
401}
402
50b5d6ad
VY
403/* Handle the timeout of the ICMP protocol unreachable timer. Trigger
404 * the correct state machine transition that will close the association.
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;
635682a1
KH
410 struct sock *sk = asoc->base.sk;
411 struct net *net = sock_net(sk);
cb3f837b 412
635682a1
KH
413 bh_lock_sock(sk);
414 if (sock_owned_by_user(sk)) {
bb33381d 415 pr_debug("%s: sock is busy\n", __func__);
50b5d6ad
VY
416
417 /* Try again later. */
418 if (!mod_timer(&transport->proto_unreach_timer,
419 jiffies + (HZ/20)))
420 sctp_association_hold(asoc);
421 goto out_unlock;
422 }
423
424 /* Is this structure just waiting around for us to actually
425 * get destroyed?
426 */
427 if (asoc->base.dead)
428 goto out_unlock;
429
55e26eb9 430 sctp_do_sm(net, SCTP_EVENT_T_OTHER,
50b5d6ad
VY
431 SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH),
432 asoc->state, asoc->ep, asoc, transport, GFP_ATOMIC);
433
434out_unlock:
635682a1 435 bh_unlock_sock(sk);
50b5d6ad
VY
436 sctp_association_put(asoc);
437}
438
439
1da177e4
LT
440/* Inject a SACK Timeout event into the state machine. */
441static void sctp_generate_sack_event(unsigned long data)
442{
443 struct sctp_association *asoc = (struct sctp_association *) data;
444 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK);
445}
446
447sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = {
448 NULL,
449 sctp_generate_t1_cookie_event,
450 sctp_generate_t1_init_event,
451 sctp_generate_t2_shutdown_event,
452 NULL,
453 sctp_generate_t4_rto_event,
454 sctp_generate_t5_shutdown_guard_event,
1e7d3d90 455 NULL,
1da177e4
LT
456 sctp_generate_sack_event,
457 sctp_generate_autoclose_event,
458};
459
460
461/* RFC 2960 8.2 Path Failure Detection
462 *
463 * When its peer endpoint is multi-homed, an endpoint should keep a
464 * error counter for each of the destination transport addresses of the
465 * peer endpoint.
466 *
467 * Each time the T3-rtx timer expires on any address, or when a
468 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
469 * the error counter of that destination address will be incremented.
470 * When the value in the error counter exceeds the protocol parameter
471 * 'Path.Max.Retrans' of that destination address, the endpoint should
472 * mark the destination transport address as inactive, and a
473 * notification SHOULD be sent to the upper layer.
474 *
475 */
5aa93bcf
NH
476static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t *commands,
477 struct sctp_association *asoc,
7e99013a
VY
478 struct sctp_transport *transport,
479 int is_hb)
1da177e4 480{
566178f8
ZY
481 struct net *net = sock_net(asoc->base.sk);
482
1da177e4
LT
483 /* The check for association's overall error counter exceeding the
484 * threshold is done in the state function.
485 */
b9f84786
VY
486 /* We are here due to a timer expiration. If the timer was
487 * not a HEARTBEAT, then normal error tracking is done.
488 * If the timer was a heartbeat, we only increment error counts
489 * when we already have an outstanding HEARTBEAT that has not
490 * been acknowledged.
25985edc 491 * Additionally, some tranport states inhibit error increments.
ad8fec17 492 */
b9f84786 493 if (!is_hb) {
ad8fec17 494 asoc->overall_error_count++;
b9f84786
VY
495 if (transport->state != SCTP_INACTIVE)
496 transport->error_count++;
497 } else if (transport->hb_sent) {
498 if (transport->state != SCTP_UNCONFIRMED)
499 asoc->overall_error_count++;
500 if (transport->state != SCTP_INACTIVE)
501 transport->error_count++;
502 }
1da177e4 503
5aa93bcf 504 /* If the transport error count is greater than the pf_retrans
7cce3b75 505 * threshold, and less than pathmaxrtx, and if the current state
8c2eab90
KH
506 * is SCTP_ACTIVE, then mark this transport as Partially Failed,
507 * see SCTP Quick Failover Draft, section 5.1
5aa93bcf 508 */
566178f8
ZY
509 if (net->sctp.pf_enable &&
510 (transport->state == SCTP_ACTIVE) &&
5aa93bcf
NH
511 (asoc->pf_retrans < transport->pathmaxrxt) &&
512 (transport->error_count > asoc->pf_retrans)) {
513
514 sctp_assoc_control_transport(asoc, transport,
515 SCTP_TRANSPORT_PF,
516 0);
517
518 /* Update the hb timer to resend a heartbeat every rto */
ba6f5e33 519 sctp_transport_reset_hb_timer(transport);
5aa93bcf
NH
520 }
521
3f7a87d2 522 if (transport->state != SCTP_INACTIVE &&
b9f84786 523 (transport->error_count > transport->pathmaxrxt)) {
bb33381d
DB
524 pr_debug("%s: association:%p transport addr:%pISpc failed\n",
525 __func__, asoc, &transport->ipaddr.sa);
526
1da177e4
LT
527 sctp_assoc_control_transport(asoc, transport,
528 SCTP_TRANSPORT_DOWN,
529 SCTP_FAILED_THRESHOLD);
530 }
531
532 /* E2) For the destination address for which the timer
533 * expires, set RTO <- RTO * 2 ("back off the timer"). The
534 * maximum value discussed in rule C7 above (RTO.max) may be
535 * used to provide an upper bound to this doubling operation.
faee47cd
VY
536 *
537 * Special Case: the first HB doesn't trigger exponential backoff.
3ad2f3fb 538 * The first unacknowledged HB triggers it. We do this with a flag
faee47cd 539 * that indicates that we have an outstanding HB.
1da177e4 540 */
7e99013a 541 if (!is_hb || transport->hb_sent) {
faee47cd 542 transport->rto = min((transport->rto * 2), transport->asoc->rto_max);
196d6759 543 sctp_max_rto(asoc, transport);
faee47cd 544 }
1da177e4
LT
545}
546
547/* Worker routine to handle INIT command failure. */
548static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands,
549 struct sctp_association *asoc,
95c96174 550 unsigned int error)
1da177e4
LT
551{
552 struct sctp_ulpevent *event;
553
cb3f837b 554 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_CANT_STR_ASSOC,
a5a35e76 555 (__u16)error, 0, 0, NULL,
1da177e4
LT
556 GFP_ATOMIC);
557
558 if (event)
559 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
560 SCTP_ULPEVENT(event));
561
562 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
563 SCTP_STATE(SCTP_STATE_CLOSED));
564
565 /* SEND_FAILED sent later when cleaning up the association. */
566 asoc->outqueue.error = error;
567 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
568}
569
570/* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
571static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands,
572 struct sctp_association *asoc,
573 sctp_event_t event_type,
574 sctp_subtype_t subtype,
575 struct sctp_chunk *chunk,
95c96174 576 unsigned int error)
1da177e4
LT
577{
578 struct sctp_ulpevent *event;
de4594a5 579 struct sctp_chunk *abort;
1da177e4
LT
580 /* Cancel any partial delivery in progress. */
581 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
582
a5a35e76
VY
583 if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT)
584 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
585 (__u16)error, 0, 0, chunk,
586 GFP_ATOMIC);
587 else
588 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
589 (__u16)error, 0, 0, NULL,
1da177e4
LT
590 GFP_ATOMIC);
591 if (event)
592 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
593 SCTP_ULPEVENT(event));
594
de4594a5
NH
595 if (asoc->overall_error_count >= asoc->max_retrans) {
596 abort = sctp_make_violation_max_retrans(asoc, chunk);
597 if (abort)
598 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
599 SCTP_CHUNK(abort));
600 }
601
1da177e4
LT
602 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
603 SCTP_STATE(SCTP_STATE_CLOSED));
604
1da177e4
LT
605 /* SEND_FAILED sent later when cleaning up the association. */
606 asoc->outqueue.error = error;
607 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
608}
609
610/* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
611 * inside the cookie. In reality, this is only used for INIT-ACK processing
612 * since all other cases use "temporary" associations and can do all
613 * their work in statefuns directly.
614 */
615static int sctp_cmd_process_init(sctp_cmd_seq_t *commands,
616 struct sctp_association *asoc,
617 struct sctp_chunk *chunk,
3182cd84 618 sctp_init_chunk_t *peer_init,
dd0fc66f 619 gfp_t gfp)
1da177e4
LT
620{
621 int error;
622
623 /* We only process the init as a sideeffect in a single
624 * case. This is when we process the INIT-ACK. If we
625 * fail during INIT processing (due to malloc problems),
626 * just return the error and stop processing the stack.
627 */
de6becdc 628 if (!sctp_process_init(asoc, chunk, sctp_source(chunk), peer_init, gfp))
1da177e4
LT
629 error = -ENOMEM;
630 else
631 error = 0;
632
633 return error;
634}
635
636/* Helper function to break out starting up of heartbeat timers. */
637static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds,
638 struct sctp_association *asoc)
639{
640 struct sctp_transport *t;
1da177e4
LT
641
642 /* Start a heartbeat timer for each transport on the association.
643 * hold a reference on the transport to make sure none of
644 * the needed data structures go away.
645 */
ba6f5e33
MRL
646 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
647 sctp_transport_reset_hb_timer(t);
1da177e4
LT
648}
649
650static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds,
651 struct sctp_association *asoc)
652{
653 struct sctp_transport *t;
1da177e4
LT
654
655 /* Stop all heartbeat timers. */
656
9dbc15f0
RD
657 list_for_each_entry(t, &asoc->peer.transport_addr_list,
658 transports) {
1da177e4
LT
659 if (del_timer(&t->hb_timer))
660 sctp_transport_put(t);
661 }
662}
663
664/* Helper function to stop any pending T3-RTX timers */
665static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds,
d808ad9a 666 struct sctp_association *asoc)
1da177e4
LT
667{
668 struct sctp_transport *t;
1da177e4 669
9dbc15f0
RD
670 list_for_each_entry(t, &asoc->peer.transport_addr_list,
671 transports) {
25cc4ae9 672 if (del_timer(&t->T3_rtx_timer))
1da177e4 673 sctp_transport_put(t);
1da177e4
LT
674 }
675}
676
677
1da177e4
LT
678/* Helper function to handle the reception of an HEARTBEAT ACK. */
679static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
680 struct sctp_association *asoc,
681 struct sctp_transport *t,
682 struct sctp_chunk *chunk)
683{
684 sctp_sender_hb_info_t *hbinfo;
34d2d89f 685 int was_unconfirmed = 0;
1da177e4
LT
686
687 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
688 * HEARTBEAT should clear the error counter of the destination
689 * transport address to which the HEARTBEAT was sent.
1da177e4
LT
690 */
691 t->error_count = 0;
f8d96052
TG
692
693 /*
694 * Although RFC4960 specifies that the overall error count must
695 * be cleared when a HEARTBEAT ACK is received, we make an
696 * exception while in SHUTDOWN PENDING. If the peer keeps its
697 * window shut forever, we may never be able to transmit our
698 * outstanding data and rely on the retransmission limit be reached
699 * to shutdown the association.
700 */
f648f807 701 if (t->asoc->state < SCTP_STATE_SHUTDOWN_PENDING)
f8d96052 702 t->asoc->overall_error_count = 0;
1da177e4 703
faee47cd
VY
704 /* Clear the hb_sent flag to signal that we had a good
705 * acknowledgement.
706 */
707 t->hb_sent = 0;
708
1da177e4
LT
709 /* Mark the destination transport address as active if it is not so
710 * marked.
711 */
34d2d89f
MH
712 if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) {
713 was_unconfirmed = 1;
1da177e4
LT
714 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
715 SCTP_HEARTBEAT_SUCCESS);
34d2d89f 716 }
1da177e4 717
5aa93bcf
NH
718 if (t->state == SCTP_PF)
719 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
720 SCTP_HEARTBEAT_SUCCESS);
721
8c2f414a
DB
722 /* HB-ACK was received for a the proper HB. Consider this
723 * forward progress.
724 */
725 if (t->dst)
726 dst_confirm(t->dst);
727
1da177e4
LT
728 /* The receiver of the HEARTBEAT ACK should also perform an
729 * RTT measurement for that destination transport address
730 * using the time value carried in the HEARTBEAT ACK chunk.
e533ca16
VY
731 * If the transport's rto_pending variable has been cleared,
732 * it was most likely due to a retransmit. However, we want
733 * to re-enable it to properly update the rto.
1da177e4 734 */
e533ca16
VY
735 if (t->rto_pending == 0)
736 t->rto_pending = 1;
737
1da177e4
LT
738 hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data;
739 sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at));
ad8fec17
SS
740
741 /* Update the heartbeat timer. */
ba6f5e33 742 sctp_transport_reset_hb_timer(t);
34d2d89f
MH
743
744 if (was_unconfirmed && asoc->peer.transport_count == 1)
745 sctp_transport_immediate_rtx(t);
1da177e4
LT
746}
747
1da177e4
LT
748
749/* Helper function to process the process SACK command. */
750static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds,
751 struct sctp_association *asoc,
edfee033 752 struct sctp_chunk *chunk)
1da177e4 753{
2e3216cd 754 int err = 0;
1da177e4 755
edfee033 756 if (sctp_outq_sack(&asoc->outqueue, chunk)) {
55e26eb9
EB
757 struct net *net = sock_net(asoc->base.sk);
758
1da177e4 759 /* There are no more TSNs awaiting SACK. */
55e26eb9 760 err = sctp_do_sm(net, SCTP_EVENT_T_OTHER,
1da177e4
LT
761 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN),
762 asoc->state, asoc->ep, asoc, NULL,
763 GFP_ATOMIC);
1da177e4
LT
764 }
765
766 return err;
767}
768
769/* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
770 * the transport for a shutdown chunk.
771 */
d808ad9a 772static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds,
1da177e4
LT
773 struct sctp_association *asoc,
774 struct sctp_chunk *chunk)
775{
776 struct sctp_transport *t;
777
c17b02b3
VY
778 if (chunk->transport)
779 t = chunk->transport;
780 else {
781 t = sctp_assoc_choose_alter_transport(asoc,
9919b455 782 asoc->shutdown_last_sent_to);
c17b02b3
VY
783 chunk->transport = t;
784 }
1da177e4
LT
785 asoc->shutdown_last_sent_to = t;
786 asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto;
1da177e4
LT
787}
788
789/* Helper function to change the state of an association. */
d808ad9a 790static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds,
1da177e4
LT
791 struct sctp_association *asoc,
792 sctp_state_t state)
793{
794 struct sock *sk = asoc->base.sk;
795
796 asoc->state = state;
797
bb33381d 798 pr_debug("%s: asoc:%p[%s]\n", __func__, asoc, sctp_state_tbl[state]);
3f7a87d2 799
1da177e4 800 if (sctp_style(sk, TCP)) {
3f7a87d2 801 /* Change the sk->sk_state of a TCP-style socket that has
af901ca1 802 * successfully completed a connect() call.
1da177e4
LT
803 */
804 if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED))
805 sk->sk_state = SCTP_SS_ESTABLISHED;
806
807 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
808 if (sctp_state(asoc, SHUTDOWN_RECEIVED) &&
d46e416c
XL
809 sctp_sstate(sk, ESTABLISHED)) {
810 sk->sk_state = SCTP_SS_CLOSING;
1da177e4 811 sk->sk_shutdown |= RCV_SHUTDOWN;
d46e416c 812 }
1da177e4
LT
813 }
814
3f7a87d2
FF
815 if (sctp_state(asoc, COOKIE_WAIT)) {
816 /* Reset init timeouts since they may have been
817 * increased due to timer expirations.
818 */
819 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
1e7d3d90 820 asoc->rto_initial;
3f7a87d2 821 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
1e7d3d90 822 asoc->rto_initial;
3f7a87d2
FF
823 }
824
1da177e4
LT
825 if (sctp_state(asoc, ESTABLISHED) ||
826 sctp_state(asoc, CLOSED) ||
827 sctp_state(asoc, SHUTDOWN_RECEIVED)) {
828 /* Wake up any processes waiting in the asoc's wait queue in
829 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
d808ad9a 830 */
1da177e4
LT
831 if (waitqueue_active(&asoc->wait))
832 wake_up_interruptible(&asoc->wait);
833
834 /* Wake up any processes waiting in the sk's sleep queue of
835 * a TCP-style or UDP-style peeled-off socket in
836 * sctp_wait_for_accept() or sctp_wait_for_packet().
837 * For a UDP-style socket, the waiters are woken up by the
838 * notifications.
839 */
840 if (!sctp_style(sk, UDP))
841 sk->sk_state_change(sk);
842 }
843}
844
845/* Helper function to delete an association. */
846static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds,
847 struct sctp_association *asoc)
848{
849 struct sock *sk = asoc->base.sk;
850
851 /* If it is a non-temporary association belonging to a TCP-style
d808ad9a 852 * listening socket that is not closed, do not free it so that accept()
1da177e4 853 * can pick it up later.
d808ad9a 854 */
1da177e4
LT
855 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) &&
856 (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK))
857 return;
858
1da177e4
LT
859 sctp_association_free(asoc);
860}
861
862/*
863 * ADDIP Section 4.1 ASCONF Chunk Procedures
864 * A4) Start a T-4 RTO timer, using the RTO value of the selected
865 * destination address (we use active path instead of primary path just
d808ad9a 866 * because primary path may be inactive.
1da177e4
LT
867 */
868static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds,
869 struct sctp_association *asoc,
870 struct sctp_chunk *chunk)
871{
872 struct sctp_transport *t;
873
9919b455 874 t = sctp_assoc_choose_alter_transport(asoc, chunk->transport);
1da177e4
LT
875 asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto;
876 chunk->transport = t;
877}
878
d808ad9a 879/* Process an incoming Operation Error Chunk. */
1da177e4
LT
880static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds,
881 struct sctp_association *asoc,
882 struct sctp_chunk *chunk)
883{
1da177e4 884 struct sctp_errhdr *err_hdr;
3df26787
WY
885 struct sctp_ulpevent *ev;
886
887 while (chunk->chunk_end > chunk->skb->data) {
888 err_hdr = (struct sctp_errhdr *)(chunk->skb->data);
889
890 ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0,
891 GFP_ATOMIC);
892 if (!ev)
893 return;
894
895 sctp_ulpq_tail_event(&asoc->ulpq, ev);
896
897 switch (err_hdr->cause) {
898 case SCTP_ERROR_UNKNOWN_CHUNK:
899 {
900 sctp_chunkhdr_t *unk_chunk_hdr;
901
902 unk_chunk_hdr = (sctp_chunkhdr_t *)err_hdr->variable;
903 switch (unk_chunk_hdr->type) {
904 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with
905 * an ERROR chunk reporting that it did not recognized
906 * the ASCONF chunk type, the sender of the ASCONF MUST
907 * NOT send any further ASCONF chunks and MUST stop its
908 * T-4 timer.
909 */
910 case SCTP_CID_ASCONF:
911 if (asoc->peer.asconf_capable == 0)
912 break;
913
914 asoc->peer.asconf_capable = 0;
915 sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP,
1da177e4 916 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO));
3df26787
WY
917 break;
918 default:
919 break;
920 }
1da177e4 921 break;
3df26787 922 }
1da177e4
LT
923 default:
924 break;
925 }
1da177e4
LT
926 }
927}
928
929/* Process variable FWDTSN chunk information. */
d808ad9a 930static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq,
1da177e4
LT
931 struct sctp_chunk *chunk)
932{
933 struct sctp_fwdtsn_skip *skip;
934 /* Walk through all the skipped SSNs */
935 sctp_walk_fwdtsn(skip, chunk) {
936 sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn));
937 }
1da177e4
LT
938}
939
d808ad9a 940/* Helper function to remove the association non-primary peer
1da177e4 941 * transports.
d808ad9a 942 */
1da177e4
LT
943static void sctp_cmd_del_non_primary(struct sctp_association *asoc)
944{
945 struct sctp_transport *t;
946 struct list_head *pos;
947 struct list_head *temp;
948
949 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
950 t = list_entry(pos, struct sctp_transport, transports);
5f242a13 951 if (!sctp_cmp_addr_exact(&t->ipaddr,
d808ad9a 952 &asoc->peer.primary_addr)) {
73e67420 953 sctp_assoc_rm_peer(asoc, t);
1da177e4
LT
954 }
955 }
1da177e4
LT
956}
957
8de8c873
SS
958/* Helper function to set sk_err on a 1-1 style socket. */
959static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error)
960{
961 struct sock *sk = asoc->base.sk;
962
963 if (!sctp_style(sk, UDP))
964 sk->sk_err = error;
965}
966
07d93967
VY
967/* Helper function to generate an association change event */
968static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands,
969 struct sctp_association *asoc,
970 u8 state)
971{
972 struct sctp_ulpevent *ev;
973
974 ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0,
975 asoc->c.sinit_num_ostreams,
976 asoc->c.sinit_max_instreams,
977 NULL, GFP_ATOMIC);
978 if (ev)
979 sctp_ulpq_tail_event(&asoc->ulpq, ev);
980}
981
982/* Helper function to generate an adaptation indication event */
983static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands,
984 struct sctp_association *asoc)
985{
986 struct sctp_ulpevent *ev;
987
988 ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC);
989
990 if (ev)
991 sctp_ulpq_tail_event(&asoc->ulpq, ev);
992}
993
96cd0d3d
VY
994
995static void sctp_cmd_t1_timer_update(struct sctp_association *asoc,
996 sctp_event_timeout_t timer,
997 char *name)
998{
999 struct sctp_transport *t;
1000
1001 t = asoc->init_last_sent_to;
1002 asoc->init_err_counter++;
1003
1004 if (t->init_sent_count > (asoc->init_cycle + 1)) {
1005 asoc->timeouts[timer] *= 2;
1006 if (asoc->timeouts[timer] > asoc->max_init_timeo) {
1007 asoc->timeouts[timer] = asoc->max_init_timeo;
1008 }
1009 asoc->init_cycle++;
bb33381d
DB
1010
1011 pr_debug("%s: T1[%s] timeout adjustment init_err_counter:%d"
1012 " cycle:%d timeout:%ld\n", __func__, name,
1013 asoc->init_err_counter, asoc->init_cycle,
1014 asoc->timeouts[timer]);
96cd0d3d
VY
1015 }
1016
1017}
1018
9c5c62be
VY
1019/* Send the whole message, chunk by chunk, to the outqueue.
1020 * This way the whole message is queued up and bundling if
1021 * encouraged for small fragments.
1022 */
1023static int sctp_cmd_send_msg(struct sctp_association *asoc,
cea8768f 1024 struct sctp_datamsg *msg, gfp_t gfp)
9c5c62be
VY
1025{
1026 struct sctp_chunk *chunk;
1027 int error = 0;
1028
1029 list_for_each_entry(chunk, &msg->chunks, frag_list) {
cea8768f 1030 error = sctp_outq_tail(&asoc->outqueue, chunk, gfp);
9c5c62be
VY
1031 if (error)
1032 break;
1033 }
1034
1035 return error;
1036}
1037
1038
c0786693
VY
1039/* Sent the next ASCONF packet currently stored in the association.
1040 * This happens after the ASCONF_ACK was succeffully processed.
1041 */
1042static void sctp_cmd_send_asconf(struct sctp_association *asoc)
1043{
55e26eb9
EB
1044 struct net *net = sock_net(asoc->base.sk);
1045
c0786693
VY
1046 /* Send the next asconf chunk from the addip chunk
1047 * queue.
1048 */
1049 if (!list_empty(&asoc->addip_chunk_list)) {
1050 struct list_head *entry = asoc->addip_chunk_list.next;
1051 struct sctp_chunk *asconf = list_entry(entry,
1052 struct sctp_chunk, list);
1053 list_del_init(entry);
1054
1055 /* Hold the chunk until an ASCONF_ACK is received. */
1056 sctp_chunk_hold(asconf);
55e26eb9 1057 if (sctp_primitive_ASCONF(net, asoc, asconf))
c0786693
VY
1058 sctp_chunk_free(asconf);
1059 else
1060 asoc->addip_last_asconf = asconf;
1061 }
1062}
1063
9c5c62be 1064
1da177e4
LT
1065/* These three macros allow us to pull the debugging code out of the
1066 * main flow of sctp_do_sm() to keep attention focused on the real
1067 * functionality there.
1068 */
bb33381d
DB
1069#define debug_pre_sfn() \
1070 pr_debug("%s[pre-fn]: ep:%p, %s, %s, asoc:%p[%s], %s\n", __func__, \
1071 ep, sctp_evttype_tbl[event_type], (*debug_fn)(subtype), \
1072 asoc, sctp_state_tbl[state], state_fn->name)
1073
1074#define debug_post_sfn() \
1075 pr_debug("%s[post-fn]: asoc:%p, status:%s\n", __func__, asoc, \
1076 sctp_status_tbl[status])
1077
1078#define debug_post_sfx() \
1079 pr_debug("%s[post-sfx]: error:%d, asoc:%p[%s]\n", __func__, error, \
1080 asoc, sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
1081 sctp_assoc2id(asoc))) ? asoc->state : SCTP_STATE_CLOSED])
1da177e4
LT
1082
1083/*
1084 * This is the master state machine processing function.
1085 *
1086 * If you want to understand all of lksctp, this is a
1087 * good place to start.
1088 */
55e26eb9 1089int sctp_do_sm(struct net *net, sctp_event_t event_type, sctp_subtype_t subtype,
1da177e4
LT
1090 sctp_state_t state,
1091 struct sctp_endpoint *ep,
1092 struct sctp_association *asoc,
1093 void *event_arg,
dd0fc66f 1094 gfp_t gfp)
1da177e4
LT
1095{
1096 sctp_cmd_seq_t commands;
1097 const sctp_sm_table_entry_t *state_fn;
1098 sctp_disposition_t status;
1099 int error = 0;
1100 typedef const char *(printfn_t)(sctp_subtype_t);
1da177e4
LT
1101 static printfn_t *table[] = {
1102 NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname,
1103 };
1104 printfn_t *debug_fn __attribute__ ((unused)) = table[event_type];
1105
1106 /* Look up the state function, run it, and then process the
1107 * side effects. These three steps are the heart of lksctp.
1108 */
55e26eb9 1109 state_fn = sctp_sm_lookup_event(net, event_type, state, subtype);
1da177e4
LT
1110
1111 sctp_init_cmd_seq(&commands);
1112
bb33381d 1113 debug_pre_sfn();
131334d0 1114 status = state_fn->fn(net, ep, asoc, subtype, event_arg, &commands);
bb33381d 1115 debug_post_sfn();
1da177e4
LT
1116
1117 error = sctp_side_effects(event_type, subtype, state,
649621e3 1118 ep, &asoc, event_arg, status,
1da177e4 1119 &commands, gfp);
bb33381d 1120 debug_post_sfx();
1da177e4
LT
1121
1122 return error;
1123}
1124
1da177e4
LT
1125/*****************************************************************
1126 * This the master state function side effect processing function.
1127 *****************************************************************/
1128static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
1129 sctp_state_t state,
1130 struct sctp_endpoint *ep,
649621e3 1131 struct sctp_association **asoc,
1da177e4
LT
1132 void *event_arg,
1133 sctp_disposition_t status,
1134 sctp_cmd_seq_t *commands,
dd0fc66f 1135 gfp_t gfp)
1da177e4
LT
1136{
1137 int error;
1138
1139 /* FIXME - Most of the dispositions left today would be categorized
1140 * as "exceptional" dispositions. For those dispositions, it
1141 * may not be proper to run through any of the commands at all.
1142 * For example, the command interpreter might be run only with
1143 * disposition SCTP_DISPOSITION_CONSUME.
1144 */
1145 if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state,
649621e3 1146 ep, *asoc,
1da177e4
LT
1147 event_arg, status,
1148 commands, gfp)))
1149 goto bail;
1150
1151 switch (status) {
1152 case SCTP_DISPOSITION_DISCARD:
bb33381d
DB
1153 pr_debug("%s: ignored sctp protocol event - state:%d, "
1154 "event_type:%d, event_id:%d\n", __func__, state,
1155 event_type, subtype.chunk);
1da177e4
LT
1156 break;
1157
1158 case SCTP_DISPOSITION_NOMEM:
1159 /* We ran out of memory, so we need to discard this
1160 * packet.
1161 */
1162 /* BUG--we should now recover some memory, probably by
1163 * reneging...
1164 */
1165 error = -ENOMEM;
1166 break;
1167
d808ad9a 1168 case SCTP_DISPOSITION_DELETE_TCB:
649621e3 1169 case SCTP_DISPOSITION_ABORT:
1da177e4 1170 /* This should now be a command. */
649621e3 1171 *asoc = NULL;
1da177e4
LT
1172 break;
1173
1174 case SCTP_DISPOSITION_CONSUME:
1da177e4
LT
1175 /*
1176 * We should no longer have much work to do here as the
1177 * real work has been done as explicit commands above.
1178 */
1179 break;
1180
1181 case SCTP_DISPOSITION_VIOLATION:
e87cc472
JP
1182 net_err_ratelimited("protocol violation state %d chunkid %d\n",
1183 state, subtype.chunk);
1da177e4
LT
1184 break;
1185
1186 case SCTP_DISPOSITION_NOT_IMPL:
145ce502
JP
1187 pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n",
1188 state, event_type, subtype.chunk);
1da177e4
LT
1189 break;
1190
1191 case SCTP_DISPOSITION_BUG:
145ce502 1192 pr_err("bug in state %d, event_type %d, event_id %d\n",
1da177e4
LT
1193 state, event_type, subtype.chunk);
1194 BUG();
1195 break;
1196
1197 default:
145ce502 1198 pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n",
1da177e4
LT
1199 status, state, event_type, subtype.chunk);
1200 BUG();
1201 break;
3ff50b79 1202 }
1da177e4
LT
1203
1204bail:
1205 return error;
1206}
1207
1208/********************************************************************
1209 * 2nd Level Abstractions
1210 ********************************************************************/
1211
1212/* This is the side-effect interpreter. */
1213static int sctp_cmd_interpreter(sctp_event_t event_type,
1214 sctp_subtype_t subtype,
1215 sctp_state_t state,
1216 struct sctp_endpoint *ep,
1217 struct sctp_association *asoc,
1218 void *event_arg,
d808ad9a 1219 sctp_disposition_t status,
1da177e4 1220 sctp_cmd_seq_t *commands,
dd0fc66f 1221 gfp_t gfp)
1da177e4 1222{
fb586f25
MRL
1223 struct sock *sk = ep->base.sk;
1224 struct sctp_sock *sp = sctp_sk(sk);
1da177e4
LT
1225 int error = 0;
1226 int force;
1227 sctp_cmd_t *cmd;
1228 struct sctp_chunk *new_obj;
1229 struct sctp_chunk *chunk = NULL;
1230 struct sctp_packet *packet;
1da177e4
LT
1231 struct timer_list *timer;
1232 unsigned long timeout;
1233 struct sctp_transport *t;
1234 struct sctp_sackhdr sackh;
1235 int local_cork = 0;
1236
1237 if (SCTP_EVENT_T_TIMEOUT != event_type)
ea110733 1238 chunk = event_arg;
1da177e4
LT
1239
1240 /* Note: This whole file is a huge candidate for rework.
1241 * For example, each command could either have its own handler, so
1242 * the loop would look like:
1243 * while (cmds)
1244 * cmd->handle(x, y, z)
1245 * --jgrimm
1246 */
1247 while (NULL != (cmd = sctp_next_cmd(commands))) {
1248 switch (cmd->verb) {
1249 case SCTP_CMD_NOP:
1250 /* Do nothing. */
1251 break;
1252
1253 case SCTP_CMD_NEW_ASOC:
1254 /* Register a new association. */
1255 if (local_cork) {
cea8768f 1256 sctp_outq_uncork(&asoc->outqueue, gfp);
1da177e4
LT
1257 local_cork = 0;
1258 }
f9e42b85 1259
1da177e4 1260 /* Register with the endpoint. */
f9e42b85
DB
1261 asoc = cmd->obj.asoc;
1262 BUG_ON(asoc->peer.primary_path == NULL);
1da177e4 1263 sctp_endpoint_add_asoc(ep, asoc);
1da177e4
LT
1264 break;
1265
1266 case SCTP_CMD_UPDATE_ASSOC:
b26ddd81 1267 sctp_assoc_update(asoc, cmd->obj.asoc);
1da177e4
LT
1268 break;
1269
1270 case SCTP_CMD_PURGE_OUTQUEUE:
1271 sctp_outq_teardown(&asoc->outqueue);
1272 break;
1273
d808ad9a 1274 case SCTP_CMD_DELETE_TCB:
1da177e4 1275 if (local_cork) {
cea8768f 1276 sctp_outq_uncork(&asoc->outqueue, gfp);
1da177e4
LT
1277 local_cork = 0;
1278 }
1279 /* Delete the current association. */
1280 sctp_cmd_delete_tcb(commands, asoc);
1281 asoc = NULL;
1282 break;
1283
1284 case SCTP_CMD_NEW_STATE:
1285 /* Enter a new state. */
1286 sctp_cmd_new_state(commands, asoc, cmd->obj.state);
1287 break;
1288
1289 case SCTP_CMD_REPORT_TSN:
1290 /* Record the arrival of a TSN. */
8e1ee18c 1291 error = sctp_tsnmap_mark(&asoc->peer.tsn_map,
4244854d 1292 cmd->obj.u32, NULL);
1da177e4
LT
1293 break;
1294
1295 case SCTP_CMD_REPORT_FWDTSN:
1296 /* Move the Cumulattive TSN Ack ahead. */
1297 sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32);
1298
ea2dfb37
VY
1299 /* purge the fragmentation queue */
1300 sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32);
1301
1da177e4
LT
1302 /* Abort any in progress partial delivery. */
1303 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
1304 break;
1305
1306 case SCTP_CMD_PROCESS_FWDTSN:
b26ddd81 1307 sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.chunk);
d808ad9a 1308 break;
1da177e4
LT
1309
1310 case SCTP_CMD_GEN_SACK:
1311 /* Generate a Selective ACK.
1312 * The argument tells us whether to just count
1313 * the packet and MAYBE generate a SACK, or
1314 * force a SACK out.
1315 */
1316 force = cmd->obj.i32;
1317 error = sctp_gen_sack(asoc, force, commands);
1318 break;
1319
1320 case SCTP_CMD_PROCESS_SACK:
1321 /* Process an inbound SACK. */
1322 error = sctp_cmd_process_sack(commands, asoc,
b26ddd81 1323 cmd->obj.chunk);
1da177e4
LT
1324 break;
1325
1326 case SCTP_CMD_GEN_INIT_ACK:
1327 /* Generate an INIT ACK chunk. */
1328 new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC,
1329 0);
1330 if (!new_obj)
1331 goto nomem;
1332
1333 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1334 SCTP_CHUNK(new_obj));
1335 break;
1336
1337 case SCTP_CMD_PEER_INIT:
1338 /* Process a unified INIT from the peer.
1339 * Note: Only used during INIT-ACK processing. If
1340 * there is an error just return to the outter
1341 * layer which will bail.
1342 */
1343 error = sctp_cmd_process_init(commands, asoc, chunk,
b26ddd81 1344 cmd->obj.init, gfp);
1da177e4
LT
1345 break;
1346
1347 case SCTP_CMD_GEN_COOKIE_ECHO:
1348 /* Generate a COOKIE ECHO chunk. */
1349 new_obj = sctp_make_cookie_echo(asoc, chunk);
1350 if (!new_obj) {
b26ddd81
NH
1351 if (cmd->obj.chunk)
1352 sctp_chunk_free(cmd->obj.chunk);
1da177e4
LT
1353 goto nomem;
1354 }
1355 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1356 SCTP_CHUNK(new_obj));
1357
1358 /* If there is an ERROR chunk to be sent along with
1359 * the COOKIE_ECHO, send it, too.
1360 */
b26ddd81 1361 if (cmd->obj.chunk)
1da177e4 1362 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
b26ddd81 1363 SCTP_CHUNK(cmd->obj.chunk));
1da177e4 1364
96cd0d3d
VY
1365 if (new_obj->transport) {
1366 new_obj->transport->init_sent_count++;
1367 asoc->init_last_sent_to = new_obj->transport;
1368 }
1369
1da177e4 1370 /* FIXME - Eventually come up with a cleaner way to
d808ad9a
YH
1371 * enabling COOKIE-ECHO + DATA bundling during
1372 * multihoming stale cookie scenarios, the following
1373 * command plays with asoc->peer.retran_path to
1374 * avoid the problem of sending the COOKIE-ECHO and
1375 * DATA in different paths, which could result
1376 * in the association being ABORTed if the DATA chunk
1da177e4
LT
1377 * is processed first by the server. Checking the
1378 * init error counter simply causes this command
1379 * to be executed only during failed attempts of
1380 * association establishment.
1381 */
3f7a87d2
FF
1382 if ((asoc->peer.retran_path !=
1383 asoc->peer.primary_path) &&
1384 (asoc->init_err_counter > 0)) {
1385 sctp_add_cmd_sf(commands,
d808ad9a 1386 SCTP_CMD_FORCE_PRIM_RETRAN,
1da177e4
LT
1387 SCTP_NULL());
1388 }
1389
1390 break;
1391
1392 case SCTP_CMD_GEN_SHUTDOWN:
1393 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1394 * Reset error counts.
1395 */
1396 asoc->overall_error_count = 0;
1397
1398 /* Generate a SHUTDOWN chunk. */
1399 new_obj = sctp_make_shutdown(asoc, chunk);
1400 if (!new_obj)
1401 goto nomem;
1402 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1403 SCTP_CHUNK(new_obj));
1404 break;
1405
1406 case SCTP_CMD_CHUNK_ULP:
1407 /* Send a chunk to the sockets layer. */
bb33381d
DB
1408 pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n",
1409 __func__, cmd->obj.chunk, &asoc->ulpq);
1410
b26ddd81 1411 sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.chunk,
1da177e4
LT
1412 GFP_ATOMIC);
1413 break;
1414
1415 case SCTP_CMD_EVENT_ULP:
1416 /* Send a notification to the sockets layer. */
bb33381d
DB
1417 pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n",
1418 __func__, cmd->obj.ulpevent, &asoc->ulpq);
1419
b26ddd81 1420 sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ulpevent);
1da177e4
LT
1421 break;
1422
1423 case SCTP_CMD_REPLY:
1424 /* If an caller has not already corked, do cork. */
1425 if (!asoc->outqueue.cork) {
1426 sctp_outq_cork(&asoc->outqueue);
1427 local_cork = 1;
1428 }
1429 /* Send a chunk to our peer. */
cea8768f
MRL
1430 error = sctp_outq_tail(&asoc->outqueue, cmd->obj.chunk,
1431 gfp);
1da177e4
LT
1432 break;
1433
1434 case SCTP_CMD_SEND_PKT:
1435 /* Send a full packet to our peer. */
b26ddd81 1436 packet = cmd->obj.packet;
cea8768f 1437 sctp_packet_transmit(packet, gfp);
1da177e4
LT
1438 sctp_ootb_pkt_free(packet);
1439 break;
1440
b6157d8e
VY
1441 case SCTP_CMD_T1_RETRAN:
1442 /* Mark a transport for retransmission. */
1443 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1444 SCTP_RTXR_T1_RTX);
1445 break;
1446
1da177e4
LT
1447 case SCTP_CMD_RETRAN:
1448 /* Mark a transport for retransmission. */
1449 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1450 SCTP_RTXR_T3_RTX);
1451 break;
1452
1da177e4
LT
1453 case SCTP_CMD_ECN_CE:
1454 /* Do delayed CE processing. */
1455 sctp_do_ecn_ce_work(asoc, cmd->obj.u32);
1456 break;
1457
1458 case SCTP_CMD_ECN_ECNE:
1459 /* Do delayed ECNE processing. */
1460 new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32,
1461 chunk);
1462 if (new_obj)
1463 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1464 SCTP_CHUNK(new_obj));
1465 break;
1466
1467 case SCTP_CMD_ECN_CWR:
1468 /* Do delayed CWR processing. */
1469 sctp_do_ecn_cwr_work(asoc, cmd->obj.u32);
1470 break;
1471
1472 case SCTP_CMD_SETUP_T2:
b26ddd81 1473 sctp_cmd_setup_t2(commands, asoc, cmd->obj.chunk);
1da177e4
LT
1474 break;
1475
f8d96052
TG
1476 case SCTP_CMD_TIMER_START_ONCE:
1477 timer = &asoc->timers[cmd->obj.to];
1478
1479 if (timer_pending(timer))
1480 break;
1481 /* fall through */
1482
1da177e4
LT
1483 case SCTP_CMD_TIMER_START:
1484 timer = &asoc->timers[cmd->obj.to];
1485 timeout = asoc->timeouts[cmd->obj.to];
09a62660 1486 BUG_ON(!timeout);
1da177e4
LT
1487
1488 timer->expires = jiffies + timeout;
1489 sctp_association_hold(asoc);
1490 add_timer(timer);
1491 break;
1492
1493 case SCTP_CMD_TIMER_RESTART:
1494 timer = &asoc->timers[cmd->obj.to];
1495 timeout = asoc->timeouts[cmd->obj.to];
1496 if (!mod_timer(timer, jiffies + timeout))
1497 sctp_association_hold(asoc);
1498 break;
1499
1500 case SCTP_CMD_TIMER_STOP:
1501 timer = &asoc->timers[cmd->obj.to];
25cc4ae9 1502 if (del_timer(timer))
1da177e4
LT
1503 sctp_association_put(asoc);
1504 break;
1505
3f7a87d2 1506 case SCTP_CMD_INIT_CHOOSE_TRANSPORT:
b26ddd81 1507 chunk = cmd->obj.chunk;
9919b455
WY
1508 t = sctp_assoc_choose_alter_transport(asoc,
1509 asoc->init_last_sent_to);
3f7a87d2
FF
1510 asoc->init_last_sent_to = t;
1511 chunk->transport = t;
1512 t->init_sent_count++;
e0e9db17
VY
1513 /* Set the new transport as primary */
1514 sctp_assoc_set_primary(asoc, t);
3f7a87d2
FF
1515 break;
1516
1da177e4
LT
1517 case SCTP_CMD_INIT_RESTART:
1518 /* Do the needed accounting and updates
1519 * associated with restarting an initialization
3f7a87d2
FF
1520 * timer. Only multiply the timeout by two if
1521 * all transports have been tried at the current
1522 * timeout.
1523 */
96cd0d3d
VY
1524 sctp_cmd_t1_timer_update(asoc,
1525 SCTP_EVENT_TIMEOUT_T1_INIT,
1526 "INIT");
3f7a87d2
FF
1527
1528 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
1529 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
1530 break;
1531
1532 case SCTP_CMD_COOKIEECHO_RESTART:
1533 /* Do the needed accounting and updates
1534 * associated with restarting an initialization
1535 * timer. Only multiply the timeout by two if
1536 * all transports have been tried at the current
1537 * timeout.
1da177e4 1538 */
96cd0d3d
VY
1539 sctp_cmd_t1_timer_update(asoc,
1540 SCTP_EVENT_TIMEOUT_T1_COOKIE,
1541 "COOKIE");
1da177e4
LT
1542
1543 /* If we've sent any data bundled with
1544 * COOKIE-ECHO we need to resend.
1545 */
9dbc15f0
RD
1546 list_for_each_entry(t, &asoc->peer.transport_addr_list,
1547 transports) {
b6157d8e
VY
1548 sctp_retransmit_mark(&asoc->outqueue, t,
1549 SCTP_RTXR_T1_RTX);
1da177e4
LT
1550 }
1551
1552 sctp_add_cmd_sf(commands,
1553 SCTP_CMD_TIMER_RESTART,
3f7a87d2 1554 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE));
1da177e4
LT
1555 break;
1556
1557 case SCTP_CMD_INIT_FAILED:
dc251b2b 1558 sctp_cmd_init_failed(commands, asoc, cmd->obj.err);
1da177e4
LT
1559 break;
1560
1561 case SCTP_CMD_ASSOC_FAILED:
1562 sctp_cmd_assoc_failed(commands, asoc, event_type,
5be291fe 1563 subtype, chunk, cmd->obj.err);
1da177e4
LT
1564 break;
1565
3f7a87d2
FF
1566 case SCTP_CMD_INIT_COUNTER_INC:
1567 asoc->init_err_counter++;
1da177e4
LT
1568 break;
1569
3f7a87d2
FF
1570 case SCTP_CMD_INIT_COUNTER_RESET:
1571 asoc->init_err_counter = 0;
1572 asoc->init_cycle = 0;
96cd0d3d
VY
1573 list_for_each_entry(t, &asoc->peer.transport_addr_list,
1574 transports) {
1575 t->init_sent_count = 0;
1576 }
1da177e4
LT
1577 break;
1578
1579 case SCTP_CMD_REPORT_DUP:
1580 sctp_tsnmap_mark_dup(&asoc->peer.tsn_map,
1581 cmd->obj.u32);
1582 break;
1583
1584 case SCTP_CMD_REPORT_BAD_TAG:
bb33381d 1585 pr_debug("%s: vtag mismatch!\n", __func__);
1da177e4
LT
1586 break;
1587
1588 case SCTP_CMD_STRIKE:
1589 /* Mark one strike against a transport. */
5aa93bcf
NH
1590 sctp_do_8_2_transport_strike(commands, asoc,
1591 cmd->obj.transport, 0);
7e99013a
VY
1592 break;
1593
1594 case SCTP_CMD_TRANSPORT_IDLE:
1595 t = cmd->obj.transport;
1596 sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE);
1da177e4
LT
1597 break;
1598
7e99013a 1599 case SCTP_CMD_TRANSPORT_HB_SENT:
1da177e4 1600 t = cmd->obj.transport;
5aa93bcf
NH
1601 sctp_do_8_2_transport_strike(commands, asoc,
1602 t, 1);
7e99013a 1603 t->hb_sent = 1;
1da177e4
LT
1604 break;
1605
1606 case SCTP_CMD_TRANSPORT_ON:
1607 t = cmd->obj.transport;
1608 sctp_cmd_transport_on(commands, asoc, t, chunk);
1609 break;
1610
1611 case SCTP_CMD_HB_TIMERS_START:
1612 sctp_cmd_hb_timers_start(commands, asoc);
1613 break;
1614
1615 case SCTP_CMD_HB_TIMER_UPDATE:
1616 t = cmd->obj.transport;
ba6f5e33 1617 sctp_transport_reset_hb_timer(t);
1da177e4
LT
1618 break;
1619
1620 case SCTP_CMD_HB_TIMERS_STOP:
1621 sctp_cmd_hb_timers_stop(commands, asoc);
1622 break;
1623
1624 case SCTP_CMD_REPORT_ERROR:
1625 error = cmd->obj.error;
1626 break;
1627
1628 case SCTP_CMD_PROCESS_CTSN:
1629 /* Dummy up a SACK for processing. */
2178eda8 1630 sackh.cum_tsn_ack = cmd->obj.be32;
d4d6fb57
VY
1631 sackh.a_rwnd = asoc->peer.rwnd +
1632 asoc->outqueue.outstanding_bytes;
1da177e4
LT
1633 sackh.num_gap_ack_blocks = 0;
1634 sackh.num_dup_tsns = 0;
f6e80abe 1635 chunk->subh.sack_hdr = &sackh;
1da177e4 1636 sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK,
f6e80abe 1637 SCTP_CHUNK(chunk));
1da177e4
LT
1638 break;
1639
1640 case SCTP_CMD_DISCARD_PACKET:
2e3216cd
VY
1641 /* We need to discard the whole packet.
1642 * Uncork the queue since there might be
1643 * responses pending
1644 */
1da177e4 1645 chunk->pdiscard = 1;
2e3216cd 1646 if (asoc) {
cea8768f 1647 sctp_outq_uncork(&asoc->outqueue, gfp);
2e3216cd
VY
1648 local_cork = 0;
1649 }
1da177e4
LT
1650 break;
1651
1652 case SCTP_CMD_RTO_PENDING:
1653 t = cmd->obj.transport;
1654 t->rto_pending = 1;
1655 break;
1656
1657 case SCTP_CMD_PART_DELIVER:
b26ddd81 1658 sctp_ulpq_partial_delivery(&asoc->ulpq, GFP_ATOMIC);
1da177e4
LT
1659 break;
1660
1661 case SCTP_CMD_RENEGE:
b26ddd81 1662 sctp_ulpq_renege(&asoc->ulpq, cmd->obj.chunk,
1da177e4
LT
1663 GFP_ATOMIC);
1664 break;
1665
1666 case SCTP_CMD_SETUP_T4:
b26ddd81 1667 sctp_cmd_setup_t4(commands, asoc, cmd->obj.chunk);
1da177e4
LT
1668 break;
1669
1670 case SCTP_CMD_PROCESS_OPERR:
1671 sctp_cmd_process_operr(commands, asoc, chunk);
1672 break;
1673 case SCTP_CMD_CLEAR_INIT_TAG:
1674 asoc->peer.i.init_tag = 0;
1675 break;
1676 case SCTP_CMD_DEL_NON_PRIMARY:
1677 sctp_cmd_del_non_primary(asoc);
1678 break;
1679 case SCTP_CMD_T3_RTX_TIMERS_STOP:
1680 sctp_cmd_t3_rtx_timers_stop(commands, asoc);
1681 break;
1682 case SCTP_CMD_FORCE_PRIM_RETRAN:
1683 t = asoc->peer.retran_path;
1684 asoc->peer.retran_path = asoc->peer.primary_path;
cea8768f 1685 error = sctp_outq_uncork(&asoc->outqueue, gfp);
1da177e4
LT
1686 local_cork = 0;
1687 asoc->peer.retran_path = t;
1688 break;
8de8c873
SS
1689 case SCTP_CMD_SET_SK_ERR:
1690 sctp_cmd_set_sk_err(asoc, cmd->obj.error);
1691 break;
07d93967
VY
1692 case SCTP_CMD_ASSOC_CHANGE:
1693 sctp_cmd_assoc_change(commands, asoc,
1694 cmd->obj.u8);
1695 break;
1696 case SCTP_CMD_ADAPTATION_IND:
1697 sctp_cmd_adaptation_ind(commands, asoc);
1698 break;
1699
730fc3d0
VY
1700 case SCTP_CMD_ASSOC_SHKEY:
1701 error = sctp_auth_asoc_init_active_key(asoc,
1702 GFP_ATOMIC);
1703 break;
f4ad85ca
GJ
1704 case SCTP_CMD_UPDATE_INITTAG:
1705 asoc->peer.i.init_tag = cmd->obj.u32;
1706 break;
9c5c62be
VY
1707 case SCTP_CMD_SEND_MSG:
1708 if (!asoc->outqueue.cork) {
1709 sctp_outq_cork(&asoc->outqueue);
1710 local_cork = 1;
1711 }
cea8768f 1712 error = sctp_cmd_send_msg(asoc, cmd->obj.msg, gfp);
9c5c62be 1713 break;
c0786693
VY
1714 case SCTP_CMD_SEND_NEXT_ASCONF:
1715 sctp_cmd_send_asconf(asoc);
1716 break;
a000c01e
WY
1717 case SCTP_CMD_PURGE_ASCONF_QUEUE:
1718 sctp_asconf_queue_teardown(asoc);
1719 break;
d5ccd496
MM
1720
1721 case SCTP_CMD_SET_ASOC:
1722 asoc = cmd->obj.asoc;
1723 break;
1724
1da177e4 1725 default:
b26ddd81
NH
1726 pr_warn("Impossible command: %u\n",
1727 cmd->verb);
1da177e4 1728 break;
3ff50b79
SH
1729 }
1730
1da177e4
LT
1731 if (error)
1732 break;
1733 }
1734
1735out:
2e3216cd
VY
1736 /* If this is in response to a received chunk, wait until
1737 * we are done with the packet to open the queue so that we don't
1738 * send multiple packets in response to a single request.
1739 */
1740 if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) {
1741 if (chunk->end_of_packet || chunk->singleton)
cea8768f 1742 error = sctp_outq_uncork(&asoc->outqueue, gfp);
2e3216cd 1743 } else if (local_cork)
cea8768f 1744 error = sctp_outq_uncork(&asoc->outqueue, gfp);
fb586f25 1745
0970f5b3
MRL
1746 if (sp->data_ready_signalled)
1747 sp->data_ready_signalled = 0;
1748
1da177e4
LT
1749 return error;
1750nomem:
1751 error = -ENOMEM;
1752 goto out;
1753}
1754
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