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Vlad Yasevich60c778b2008-01-11 09:57:09 -05001/* SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -05006 * This file is part of the SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
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 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050012 * This SCTP implementation is free software;
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 * 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 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050018 * This SCTP implementation is distributed in the hope that it
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 * 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
25 * along with GNU CC; see the file COPYING. If not, write to
26 * the Free Software Foundation, 59 Temple Place - Suite 330,
27 * Boston, MA 02111-1307, USA.
28 *
29 * Please send any bug reports or fixes you make to the
30 * email address(es):
31 * lksctp developers <lksctp-developers@lists.sourceforge.net>
32 *
33 * Or submit a bug report through the following website:
34 * http://www.sf.net/projects/lksctp
35 *
36 * Written or modified by:
37 * La Monte H.P. Yarroll <piggy@acm.org>
38 * Karl Knutson <karl@athena.chicago.il.us>
39 * Jon Grimm <jgrimm@austin.ibm.com>
40 * Hui Huang <hui.huang@nokia.com>
41 * Dajiang Zhang <dajiang.zhang@nokia.com>
42 * Daisy Chang <daisyc@us.ibm.com>
43 * Sridhar Samudrala <sri@us.ibm.com>
44 * Ardelle Fan <ardelle.fan@intel.com>
45 *
46 * Any bugs reported given to us we will try to fix... any fixes shared will
47 * be incorporated into the next SCTP release.
48 */
49
50#include <linux/skbuff.h>
51#include <linux/types.h>
52#include <linux/socket.h>
53#include <linux/ip.h>
54#include <net/sock.h>
55#include <net/sctp/sctp.h>
56#include <net/sctp/sm.h>
57
58static int sctp_cmd_interpreter(sctp_event_t event_type,
59 sctp_subtype_t subtype,
60 sctp_state_t state,
61 struct sctp_endpoint *ep,
62 struct sctp_association *asoc,
63 void *event_arg,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +090064 sctp_disposition_t status,
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 sctp_cmd_seq_t *commands,
Al Virodd0fc662005-10-07 07:46:04 +010066 gfp_t gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
68 sctp_state_t state,
69 struct sctp_endpoint *ep,
70 struct sctp_association *asoc,
71 void *event_arg,
72 sctp_disposition_t status,
73 sctp_cmd_seq_t *commands,
Al Virodd0fc662005-10-07 07:46:04 +010074 gfp_t gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76/********************************************************************
77 * Helper functions
78 ********************************************************************/
79
80/* A helper function for delayed processing of INET ECN CE bit. */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +090081static void sctp_do_ecn_ce_work(struct sctp_association *asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 __u32 lowest_tsn)
83{
84 /* Save the TSN away for comparison when we receive CWR */
85
86 asoc->last_ecne_tsn = lowest_tsn;
87 asoc->need_ecne = 1;
88}
89
90/* Helper function for delayed processing of SCTP ECNE chunk. */
91/* RFC 2960 Appendix A
92 *
93 * RFC 2481 details a specific bit for a sender to send in
94 * the header of its next outbound TCP segment to indicate to
95 * its peer that it has reduced its congestion window. This
96 * is termed the CWR bit. For SCTP the same indication is made
97 * by including the CWR chunk. This chunk contains one data
98 * element, i.e. the TSN number that was sent in the ECNE chunk.
99 * This element represents the lowest TSN number in the datagram
100 * that was originally marked with the CE bit.
101 */
102static struct sctp_chunk *sctp_do_ecn_ecne_work(struct sctp_association *asoc,
103 __u32 lowest_tsn,
104 struct sctp_chunk *chunk)
105{
106 struct sctp_chunk *repl;
107
108 /* Our previously transmitted packet ran into some congestion
109 * so we should take action by reducing cwnd and ssthresh
110 * and then ACK our peer that we we've done so by
111 * sending a CWR.
112 */
113
114 /* First, try to determine if we want to actually lower
115 * our cwnd variables. Only lower them if the ECNE looks more
116 * recent than the last response.
117 */
118 if (TSN_lt(asoc->last_cwr_tsn, lowest_tsn)) {
119 struct sctp_transport *transport;
120
121 /* Find which transport's congestion variables
122 * need to be adjusted.
123 */
124 transport = sctp_assoc_lookup_tsn(asoc, lowest_tsn);
125
126 /* Update the congestion variables. */
127 if (transport)
128 sctp_transport_lower_cwnd(transport,
129 SCTP_LOWER_CWND_ECNE);
130 asoc->last_cwr_tsn = lowest_tsn;
131 }
132
133 /* Always try to quiet the other end. In case of lost CWR,
134 * resend last_cwr_tsn.
135 */
136 repl = sctp_make_cwr(asoc, asoc->last_cwr_tsn, chunk);
137
138 /* If we run out of memory, it will look like a lost CWR. We'll
139 * get back in sync eventually.
140 */
141 return repl;
142}
143
144/* Helper function to do delayed processing of ECN CWR chunk. */
145static void sctp_do_ecn_cwr_work(struct sctp_association *asoc,
146 __u32 lowest_tsn)
147{
148 /* Turn off ECNE getting auto-prepended to every outgoing
149 * packet
150 */
151 asoc->need_ecne = 0;
152}
153
154/* Generate SACK if necessary. We call this at the end of a packet. */
155static int sctp_gen_sack(struct sctp_association *asoc, int force,
156 sctp_cmd_seq_t *commands)
157{
158 __u32 ctsn, max_tsn_seen;
159 struct sctp_chunk *sack;
Frank Filz52ccb8e2005-12-22 11:36:46 -0800160 struct sctp_transport *trans = asoc->peer.last_data_from;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 int error = 0;
162
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900163 if (force ||
Frank Filz52ccb8e2005-12-22 11:36:46 -0800164 (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) ||
165 (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 asoc->peer.sack_needed = 1;
167
168 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
169 max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
170
171 /* From 12.2 Parameters necessary per association (i.e. the TCB):
172 *
173 * Ack State : This flag indicates if the next received packet
174 * : is to be responded to with a SACK. ...
175 * : When DATA chunks are out of order, SACK's
176 * : are not delayed (see Section 6).
177 *
178 * [This is actually not mentioned in Section 6, but we
179 * implement it here anyway. --piggy]
180 */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900181 if (max_tsn_seen != ctsn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 asoc->peer.sack_needed = 1;
183
184 /* From 6.2 Acknowledgement on Reception of DATA Chunks:
185 *
186 * Section 4.2 of [RFC2581] SHOULD be followed. Specifically,
187 * an acknowledgement SHOULD be generated for at least every
188 * second packet (not every second DATA chunk) received, and
189 * SHOULD be generated within 200 ms of the arrival of any
190 * unacknowledged DATA chunk. ...
191 */
192 if (!asoc->peer.sack_needed) {
Wei Yongjund364d922008-05-09 15:13:26 -0700193 asoc->peer.sack_cnt++;
Frank Filz52ccb8e2005-12-22 11:36:46 -0800194
195 /* Set the SACK delay timeout based on the
196 * SACK delay for the last transport
197 * data was received from, or the default
198 * for the association.
199 */
Wei Yongjund364d922008-05-09 15:13:26 -0700200 if (trans) {
201 /* We will need a SACK for the next packet. */
202 if (asoc->peer.sack_cnt >= trans->sackfreq - 1)
203 asoc->peer.sack_needed = 1;
204
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900205 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
Frank Filz52ccb8e2005-12-22 11:36:46 -0800206 trans->sackdelay;
Wei Yongjund364d922008-05-09 15:13:26 -0700207 } else {
208 /* We will need a SACK for the next packet. */
209 if (asoc->peer.sack_cnt >= asoc->sackfreq - 1)
210 asoc->peer.sack_needed = 1;
211
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900212 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
Frank Filz52ccb8e2005-12-22 11:36:46 -0800213 asoc->sackdelay;
Wei Yongjund364d922008-05-09 15:13:26 -0700214 }
Frank Filz52ccb8e2005-12-22 11:36:46 -0800215
216 /* Restart the SACK timer. */
217 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
218 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 } else {
220 if (asoc->a_rwnd > asoc->rwnd)
221 asoc->a_rwnd = asoc->rwnd;
222 sack = sctp_make_sack(asoc);
223 if (!sack)
224 goto nomem;
225
226 asoc->peer.sack_needed = 0;
Wei Yongjund364d922008-05-09 15:13:26 -0700227 asoc->peer.sack_cnt = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
Vlad Yasevich732ba352007-01-15 19:20:21 -0800229 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
231 /* Stop the SACK timer. */
232 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
233 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
234 }
Frank Filz52ccb8e2005-12-22 11:36:46 -0800235
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 return error;
237nomem:
238 error = -ENOMEM;
239 return error;
240}
241
242/* When the T3-RTX timer expires, it calls this function to create the
243 * relevant state machine event.
244 */
245void sctp_generate_t3_rtx_event(unsigned long peer)
246{
247 int error;
248 struct sctp_transport *transport = (struct sctp_transport *) peer;
249 struct sctp_association *asoc = transport->asoc;
250
251 /* Check whether a task is in the sock. */
252
253 sctp_bh_lock_sock(asoc->base.sk);
254 if (sock_owned_by_user(asoc->base.sk)) {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800255 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
257 /* Try again later. */
258 if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20)))
259 sctp_transport_hold(transport);
260 goto out_unlock;
261 }
262
263 /* Is this transport really dead and just waiting around for
264 * the timer to let go of the reference?
265 */
266 if (transport->dead)
267 goto out_unlock;
268
269 /* Run through the state machine. */
270 error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT,
271 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX),
272 asoc->state,
273 asoc->ep, asoc,
274 transport, GFP_ATOMIC);
275
276 if (error)
277 asoc->base.sk->sk_err = -error;
278
279out_unlock:
280 sctp_bh_unlock_sock(asoc->base.sk);
281 sctp_transport_put(transport);
282}
283
284/* This is a sa interface for producing timeout events. It works
285 * for timeouts which use the association as their parameter.
286 */
287static void sctp_generate_timeout_event(struct sctp_association *asoc,
288 sctp_event_timeout_t timeout_type)
289{
290 int error = 0;
291
292 sctp_bh_lock_sock(asoc->base.sk);
293 if (sock_owned_by_user(asoc->base.sk)) {
294 SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800295 __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 timeout_type);
297
298 /* Try again later. */
299 if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20)))
300 sctp_association_hold(asoc);
301 goto out_unlock;
302 }
303
304 /* Is this association really dead and just waiting around for
305 * the timer to let go of the reference?
306 */
307 if (asoc->base.dead)
308 goto out_unlock;
309
310 /* Run through the state machine. */
311 error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT,
312 SCTP_ST_TIMEOUT(timeout_type),
313 asoc->state, asoc->ep, asoc,
314 (void *)timeout_type, GFP_ATOMIC);
315
316 if (error)
317 asoc->base.sk->sk_err = -error;
318
319out_unlock:
320 sctp_bh_unlock_sock(asoc->base.sk);
321 sctp_association_put(asoc);
322}
323
324static void sctp_generate_t1_cookie_event(unsigned long data)
325{
326 struct sctp_association *asoc = (struct sctp_association *) data;
327 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE);
328}
329
330static void sctp_generate_t1_init_event(unsigned long data)
331{
332 struct sctp_association *asoc = (struct sctp_association *) data;
333 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT);
334}
335
336static void sctp_generate_t2_shutdown_event(unsigned long data)
337{
338 struct sctp_association *asoc = (struct sctp_association *) data;
339 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN);
340}
341
342static void sctp_generate_t4_rto_event(unsigned long data)
343{
344 struct sctp_association *asoc = (struct sctp_association *) data;
345 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO);
346}
347
348static void sctp_generate_t5_shutdown_guard_event(unsigned long data)
349{
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900350 struct sctp_association *asoc = (struct sctp_association *)data;
351 sctp_generate_timeout_event(asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD);
353
354} /* sctp_generate_t5_shutdown_guard_event() */
355
356static void sctp_generate_autoclose_event(unsigned long data)
357{
358 struct sctp_association *asoc = (struct sctp_association *) data;
359 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE);
360}
361
362/* Generate a heart beat event. If the sock is busy, reschedule. Make
363 * sure that the transport is still valid.
364 */
365void sctp_generate_heartbeat_event(unsigned long data)
366{
367 int error = 0;
368 struct sctp_transport *transport = (struct sctp_transport *) data;
369 struct sctp_association *asoc = transport->asoc;
370
371 sctp_bh_lock_sock(asoc->base.sk);
372 if (sock_owned_by_user(asoc->base.sk)) {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800373 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374
375 /* Try again later. */
376 if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20)))
377 sctp_transport_hold(transport);
378 goto out_unlock;
379 }
380
381 /* Is this structure just waiting around for us to actually
382 * get destroyed?
383 */
384 if (transport->dead)
385 goto out_unlock;
386
387 error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT,
388 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT),
389 asoc->state, asoc->ep, asoc,
390 transport, GFP_ATOMIC);
391
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900392 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 asoc->base.sk->sk_err = -error;
394
395out_unlock:
396 sctp_bh_unlock_sock(asoc->base.sk);
397 sctp_transport_put(transport);
398}
399
400/* Inject a SACK Timeout event into the state machine. */
401static void sctp_generate_sack_event(unsigned long data)
402{
403 struct sctp_association *asoc = (struct sctp_association *) data;
404 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK);
405}
406
407sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = {
408 NULL,
409 sctp_generate_t1_cookie_event,
410 sctp_generate_t1_init_event,
411 sctp_generate_t2_shutdown_event,
412 NULL,
413 sctp_generate_t4_rto_event,
414 sctp_generate_t5_shutdown_guard_event,
Vladislav Yasevich1e7d3d92005-11-11 16:06:16 -0800415 NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 sctp_generate_sack_event,
417 sctp_generate_autoclose_event,
418};
419
420
421/* RFC 2960 8.2 Path Failure Detection
422 *
423 * When its peer endpoint is multi-homed, an endpoint should keep a
424 * error counter for each of the destination transport addresses of the
425 * peer endpoint.
426 *
427 * Each time the T3-rtx timer expires on any address, or when a
428 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
429 * the error counter of that destination address will be incremented.
430 * When the value in the error counter exceeds the protocol parameter
431 * 'Path.Max.Retrans' of that destination address, the endpoint should
432 * mark the destination transport address as inactive, and a
433 * notification SHOULD be sent to the upper layer.
434 *
435 */
436static void sctp_do_8_2_transport_strike(struct sctp_association *asoc,
437 struct sctp_transport *transport)
438{
439 /* The check for association's overall error counter exceeding the
440 * threshold is done in the state function.
441 */
Sridhar Samudralaad8fec12006-07-21 14:48:50 -0700442 /* When probing UNCONFIRMED addresses, the association overall
443 * error count is NOT incremented
444 */
445 if (transport->state != SCTP_UNCONFIRMED)
446 asoc->overall_error_count++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
Frank Filz3f7a87d2005-06-20 13:14:57 -0700448 if (transport->state != SCTP_INACTIVE &&
Frank Filz52ccb8e2005-12-22 11:36:46 -0800449 (transport->error_count++ >= transport->pathmaxrxt)) {
Frank Filz3f7a87d2005-06-20 13:14:57 -0700450 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
451 " transport IP: port:%d failed.\n",
452 asoc,
Al Virob3f5b3b2006-11-20 17:22:43 -0800453 (&transport->ipaddr),
454 ntohs(transport->ipaddr.v4.sin_port));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 sctp_assoc_control_transport(asoc, transport,
456 SCTP_TRANSPORT_DOWN,
457 SCTP_FAILED_THRESHOLD);
458 }
459
460 /* E2) For the destination address for which the timer
461 * expires, set RTO <- RTO * 2 ("back off the timer"). The
462 * maximum value discussed in rule C7 above (RTO.max) may be
463 * used to provide an upper bound to this doubling operation.
464 */
Vlad Yasevichb6157d82007-10-24 15:59:16 -0400465 transport->last_rto = transport->rto;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 transport->rto = min((transport->rto * 2), transport->asoc->rto_max);
467}
468
469/* Worker routine to handle INIT command failure. */
470static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands,
471 struct sctp_association *asoc,
472 unsigned error)
473{
474 struct sctp_ulpevent *event;
475
476 event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC,
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700477 (__u16)error, 0, 0, NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 GFP_ATOMIC);
479
480 if (event)
481 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
482 SCTP_ULPEVENT(event));
483
484 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
485 SCTP_STATE(SCTP_STATE_CLOSED));
486
487 /* SEND_FAILED sent later when cleaning up the association. */
488 asoc->outqueue.error = error;
489 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
490}
491
492/* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
493static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands,
494 struct sctp_association *asoc,
495 sctp_event_t event_type,
496 sctp_subtype_t subtype,
497 struct sctp_chunk *chunk,
498 unsigned error)
499{
500 struct sctp_ulpevent *event;
501
502 /* Cancel any partial delivery in progress. */
503 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
504
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700505 if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT)
506 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
507 (__u16)error, 0, 0, chunk,
508 GFP_ATOMIC);
509 else
510 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
511 (__u16)error, 0, 0, NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 GFP_ATOMIC);
513 if (event)
514 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
515 SCTP_ULPEVENT(event));
516
517 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
518 SCTP_STATE(SCTP_STATE_CLOSED));
519
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 /* SEND_FAILED sent later when cleaning up the association. */
521 asoc->outqueue.error = error;
522 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
523}
524
525/* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
526 * inside the cookie. In reality, this is only used for INIT-ACK processing
527 * since all other cases use "temporary" associations and can do all
528 * their work in statefuns directly.
529 */
530static int sctp_cmd_process_init(sctp_cmd_seq_t *commands,
531 struct sctp_association *asoc,
532 struct sctp_chunk *chunk,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -0700533 sctp_init_chunk_t *peer_init,
Al Virodd0fc662005-10-07 07:46:04 +0100534 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535{
536 int error;
537
538 /* We only process the init as a sideeffect in a single
539 * case. This is when we process the INIT-ACK. If we
540 * fail during INIT processing (due to malloc problems),
541 * just return the error and stop processing the stack.
542 */
543 if (!sctp_process_init(asoc, chunk->chunk_hdr->type,
544 sctp_source(chunk), peer_init, gfp))
545 error = -ENOMEM;
546 else
547 error = 0;
548
549 return error;
550}
551
552/* Helper function to break out starting up of heartbeat timers. */
553static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds,
554 struct sctp_association *asoc)
555{
556 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
558 /* Start a heartbeat timer for each transport on the association.
559 * hold a reference on the transport to make sure none of
560 * the needed data structures go away.
561 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700562 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563
564 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
565 sctp_transport_hold(t);
566 }
567}
568
569static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds,
570 struct sctp_association *asoc)
571{
572 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
574 /* Stop all heartbeat timers. */
575
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700576 list_for_each_entry(t, &asoc->peer.transport_addr_list,
577 transports) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 if (del_timer(&t->hb_timer))
579 sctp_transport_put(t);
580 }
581}
582
583/* Helper function to stop any pending T3-RTX timers */
584static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900585 struct sctp_association *asoc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586{
587 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700589 list_for_each_entry(t, &asoc->peer.transport_addr_list,
590 transports) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 if (timer_pending(&t->T3_rtx_timer) &&
592 del_timer(&t->T3_rtx_timer)) {
593 sctp_transport_put(t);
594 }
595 }
596}
597
598
599/* Helper function to update the heartbeat timer. */
600static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 struct sctp_transport *t)
602{
603 /* Update the heartbeat timer. */
604 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
605 sctp_transport_hold(t);
606}
607
608/* Helper function to handle the reception of an HEARTBEAT ACK. */
609static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
610 struct sctp_association *asoc,
611 struct sctp_transport *t,
612 struct sctp_chunk *chunk)
613{
614 sctp_sender_hb_info_t *hbinfo;
615
616 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
617 * HEARTBEAT should clear the error counter of the destination
618 * transport address to which the HEARTBEAT was sent.
619 * The association's overall error count is also cleared.
620 */
621 t->error_count = 0;
622 t->asoc->overall_error_count = 0;
623
624 /* Mark the destination transport address as active if it is not so
625 * marked.
626 */
Sridhar Samudralaad8fec12006-07-21 14:48:50 -0700627 if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
629 SCTP_HEARTBEAT_SUCCESS);
630
631 /* The receiver of the HEARTBEAT ACK should also perform an
632 * RTT measurement for that destination transport address
633 * using the time value carried in the HEARTBEAT ACK chunk.
Vlad Yaseviche533ca12007-01-30 14:36:14 -0800634 * If the transport's rto_pending variable has been cleared,
635 * it was most likely due to a retransmit. However, we want
636 * to re-enable it to properly update the rto.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 */
Vlad Yaseviche533ca12007-01-30 14:36:14 -0800638 if (t->rto_pending == 0)
639 t->rto_pending = 1;
640
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data;
642 sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at));
Sridhar Samudralaad8fec12006-07-21 14:48:50 -0700643
644 /* Update the heartbeat timer. */
645 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
646 sctp_transport_hold(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647}
648
649/* Helper function to do a transport reset at the expiry of the hearbeat
650 * timer.
651 */
652static void sctp_cmd_transport_reset(sctp_cmd_seq_t *cmds,
653 struct sctp_association *asoc,
654 struct sctp_transport *t)
655{
656 sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE);
657
658 /* Mark one strike against a transport. */
659 sctp_do_8_2_transport_strike(asoc, t);
660}
661
662/* Helper function to process the process SACK command. */
663static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds,
664 struct sctp_association *asoc,
665 struct sctp_sackhdr *sackh)
666{
Vlad Yasevich2e3216c2008-06-19 16:08:18 -0700667 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
669 if (sctp_outq_sack(&asoc->outqueue, sackh)) {
670 /* There are no more TSNs awaiting SACK. */
671 err = sctp_do_sm(SCTP_EVENT_T_OTHER,
672 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN),
673 asoc->state, asoc->ep, asoc, NULL,
674 GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 }
676
677 return err;
678}
679
680/* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
681 * the transport for a shutdown chunk.
682 */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900683static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 struct sctp_association *asoc,
685 struct sctp_chunk *chunk)
686{
687 struct sctp_transport *t;
688
689 t = sctp_assoc_choose_shutdown_transport(asoc);
690 asoc->shutdown_last_sent_to = t;
691 asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto;
692 chunk->transport = t;
693}
694
695/* Helper function to change the state of an association. */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900696static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 struct sctp_association *asoc,
698 sctp_state_t state)
699{
700 struct sock *sk = asoc->base.sk;
701
702 asoc->state = state;
703
Frank Filz3f7a87d2005-06-20 13:14:57 -0700704 SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n",
705 asoc, sctp_state_tbl[state]);
706
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 if (sctp_style(sk, TCP)) {
Frank Filz3f7a87d2005-06-20 13:14:57 -0700708 /* Change the sk->sk_state of a TCP-style socket that has
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 * sucessfully completed a connect() call.
710 */
711 if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED))
712 sk->sk_state = SCTP_SS_ESTABLISHED;
713
714 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
715 if (sctp_state(asoc, SHUTDOWN_RECEIVED) &&
716 sctp_sstate(sk, ESTABLISHED))
717 sk->sk_shutdown |= RCV_SHUTDOWN;
718 }
719
Frank Filz3f7a87d2005-06-20 13:14:57 -0700720 if (sctp_state(asoc, COOKIE_WAIT)) {
721 /* Reset init timeouts since they may have been
722 * increased due to timer expirations.
723 */
724 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
Vladislav Yasevich1e7d3d92005-11-11 16:06:16 -0800725 asoc->rto_initial;
Frank Filz3f7a87d2005-06-20 13:14:57 -0700726 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
Vladislav Yasevich1e7d3d92005-11-11 16:06:16 -0800727 asoc->rto_initial;
Frank Filz3f7a87d2005-06-20 13:14:57 -0700728 }
729
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 if (sctp_state(asoc, ESTABLISHED) ||
731 sctp_state(asoc, CLOSED) ||
732 sctp_state(asoc, SHUTDOWN_RECEIVED)) {
733 /* Wake up any processes waiting in the asoc's wait queue in
734 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900735 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 if (waitqueue_active(&asoc->wait))
737 wake_up_interruptible(&asoc->wait);
738
739 /* Wake up any processes waiting in the sk's sleep queue of
740 * a TCP-style or UDP-style peeled-off socket in
741 * sctp_wait_for_accept() or sctp_wait_for_packet().
742 * For a UDP-style socket, the waiters are woken up by the
743 * notifications.
744 */
745 if (!sctp_style(sk, UDP))
746 sk->sk_state_change(sk);
747 }
748}
749
750/* Helper function to delete an association. */
751static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds,
752 struct sctp_association *asoc)
753{
754 struct sock *sk = asoc->base.sk;
755
756 /* If it is a non-temporary association belonging to a TCP-style
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900757 * listening socket that is not closed, do not free it so that accept()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 * can pick it up later.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900759 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) &&
761 (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK))
762 return;
763
764 sctp_unhash_established(asoc);
765 sctp_association_free(asoc);
766}
767
768/*
769 * ADDIP Section 4.1 ASCONF Chunk Procedures
770 * A4) Start a T-4 RTO timer, using the RTO value of the selected
771 * destination address (we use active path instead of primary path just
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900772 * because primary path may be inactive.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 */
774static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds,
775 struct sctp_association *asoc,
776 struct sctp_chunk *chunk)
777{
778 struct sctp_transport *t;
779
780 t = asoc->peer.active_path;
781 asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto;
782 chunk->transport = t;
783}
784
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900785/* Process an incoming Operation Error Chunk. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds,
787 struct sctp_association *asoc,
788 struct sctp_chunk *chunk)
789{
790 struct sctp_operr_chunk *operr_chunk;
791 struct sctp_errhdr *err_hdr;
792
793 operr_chunk = (struct sctp_operr_chunk *)chunk->chunk_hdr;
794 err_hdr = &operr_chunk->err_hdr;
795
796 switch (err_hdr->cause) {
797 case SCTP_ERROR_UNKNOWN_CHUNK:
798 {
799 struct sctp_chunkhdr *unk_chunk_hdr;
800
801 unk_chunk_hdr = (struct sctp_chunkhdr *)err_hdr->variable;
802 switch (unk_chunk_hdr->type) {
803 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with an
804 * ERROR chunk reporting that it did not recognized the ASCONF
805 * chunk type, the sender of the ASCONF MUST NOT send any
806 * further ASCONF chunks and MUST stop its T-4 timer.
807 */
808 case SCTP_CID_ASCONF:
809 asoc->peer.asconf_capable = 0;
810 sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP,
811 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO));
812 break;
813 default:
814 break;
815 }
816 break;
817 }
818 default:
819 break;
820 }
821}
822
823/* Process variable FWDTSN chunk information. */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900824static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 struct sctp_chunk *chunk)
826{
827 struct sctp_fwdtsn_skip *skip;
828 /* Walk through all the skipped SSNs */
829 sctp_walk_fwdtsn(skip, chunk) {
830 sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn));
831 }
832
833 return;
834}
835
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900836/* Helper function to remove the association non-primary peer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 * transports.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900838 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839static void sctp_cmd_del_non_primary(struct sctp_association *asoc)
840{
841 struct sctp_transport *t;
842 struct list_head *pos;
843 struct list_head *temp;
844
845 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
846 t = list_entry(pos, struct sctp_transport, transports);
Al Viro5f242a12006-11-20 17:05:23 -0800847 if (!sctp_cmp_addr_exact(&t->ipaddr,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900848 &asoc->peer.primary_addr)) {
Al Viro38a03142006-11-20 17:06:45 -0800849 sctp_assoc_del_peer(asoc, &t->ipaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 }
851 }
852
853 return;
854}
855
Sridhar Samudrala8de8c872006-05-19 10:58:12 -0700856/* Helper function to set sk_err on a 1-1 style socket. */
857static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error)
858{
859 struct sock *sk = asoc->base.sk;
860
861 if (!sctp_style(sk, UDP))
862 sk->sk_err = error;
863}
864
Vlad Yasevich07d93962007-05-04 13:55:27 -0700865/* Helper function to generate an association change event */
866static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands,
867 struct sctp_association *asoc,
868 u8 state)
869{
870 struct sctp_ulpevent *ev;
871
872 ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0,
873 asoc->c.sinit_num_ostreams,
874 asoc->c.sinit_max_instreams,
875 NULL, GFP_ATOMIC);
876 if (ev)
877 sctp_ulpq_tail_event(&asoc->ulpq, ev);
878}
879
880/* Helper function to generate an adaptation indication event */
881static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands,
882 struct sctp_association *asoc)
883{
884 struct sctp_ulpevent *ev;
885
886 ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC);
887
888 if (ev)
889 sctp_ulpq_tail_event(&asoc->ulpq, ev);
890}
891
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892/* These three macros allow us to pull the debugging code out of the
893 * main flow of sctp_do_sm() to keep attention focused on the real
894 * functionality there.
895 */
896#define DEBUG_PRE \
897 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
898 "ep %p, %s, %s, asoc %p[%s], %s\n", \
899 ep, sctp_evttype_tbl[event_type], \
900 (*debug_fn)(subtype), asoc, \
901 sctp_state_tbl[state], state_fn->name)
902
903#define DEBUG_POST \
904 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
905 "asoc %p, status: %s\n", \
906 asoc, sctp_status_tbl[status])
907
908#define DEBUG_POST_SFX \
909 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
910 error, asoc, \
911 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
912 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
913
914/*
915 * This is the master state machine processing function.
916 *
917 * If you want to understand all of lksctp, this is a
918 * good place to start.
919 */
920int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype,
921 sctp_state_t state,
922 struct sctp_endpoint *ep,
923 struct sctp_association *asoc,
924 void *event_arg,
Al Virodd0fc662005-10-07 07:46:04 +0100925 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926{
927 sctp_cmd_seq_t commands;
928 const sctp_sm_table_entry_t *state_fn;
929 sctp_disposition_t status;
930 int error = 0;
931 typedef const char *(printfn_t)(sctp_subtype_t);
932
933 static printfn_t *table[] = {
934 NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname,
935 };
936 printfn_t *debug_fn __attribute__ ((unused)) = table[event_type];
937
938 /* Look up the state function, run it, and then process the
939 * side effects. These three steps are the heart of lksctp.
940 */
941 state_fn = sctp_sm_lookup_event(event_type, state, subtype);
942
943 sctp_init_cmd_seq(&commands);
944
945 DEBUG_PRE;
946 status = (*state_fn->fn)(ep, asoc, subtype, event_arg, &commands);
947 DEBUG_POST;
948
949 error = sctp_side_effects(event_type, subtype, state,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900950 ep, asoc, event_arg, status,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 &commands, gfp);
952 DEBUG_POST_SFX;
953
954 return error;
955}
956
957#undef DEBUG_PRE
958#undef DEBUG_POST
959
960/*****************************************************************
961 * This the master state function side effect processing function.
962 *****************************************************************/
963static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
964 sctp_state_t state,
965 struct sctp_endpoint *ep,
966 struct sctp_association *asoc,
967 void *event_arg,
968 sctp_disposition_t status,
969 sctp_cmd_seq_t *commands,
Al Virodd0fc662005-10-07 07:46:04 +0100970 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971{
972 int error;
973
974 /* FIXME - Most of the dispositions left today would be categorized
975 * as "exceptional" dispositions. For those dispositions, it
976 * may not be proper to run through any of the commands at all.
977 * For example, the command interpreter might be run only with
978 * disposition SCTP_DISPOSITION_CONSUME.
979 */
980 if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state,
981 ep, asoc,
982 event_arg, status,
983 commands, gfp)))
984 goto bail;
985
986 switch (status) {
987 case SCTP_DISPOSITION_DISCARD:
988 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
989 "event_type %d, event_id %d\n",
990 state, event_type, subtype.chunk);
991 break;
992
993 case SCTP_DISPOSITION_NOMEM:
994 /* We ran out of memory, so we need to discard this
995 * packet.
996 */
997 /* BUG--we should now recover some memory, probably by
998 * reneging...
999 */
1000 error = -ENOMEM;
1001 break;
1002
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001003 case SCTP_DISPOSITION_DELETE_TCB:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 /* This should now be a command. */
1005 break;
1006
1007 case SCTP_DISPOSITION_CONSUME:
1008 case SCTP_DISPOSITION_ABORT:
1009 /*
1010 * We should no longer have much work to do here as the
1011 * real work has been done as explicit commands above.
1012 */
1013 break;
1014
1015 case SCTP_DISPOSITION_VIOLATION:
Wei Yongjund99fa422007-08-27 11:19:24 +08001016 if (net_ratelimit())
1017 printk(KERN_ERR "sctp protocol violation state %d "
1018 "chunkid %d\n", state, subtype.chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 break;
1020
1021 case SCTP_DISPOSITION_NOT_IMPL:
1022 printk(KERN_WARNING "sctp unimplemented feature in state %d, "
1023 "event_type %d, event_id %d\n",
1024 state, event_type, subtype.chunk);
1025 break;
1026
1027 case SCTP_DISPOSITION_BUG:
1028 printk(KERN_ERR "sctp bug in state %d, "
1029 "event_type %d, event_id %d\n",
1030 state, event_type, subtype.chunk);
1031 BUG();
1032 break;
1033
1034 default:
1035 printk(KERN_ERR "sctp impossible disposition %d "
1036 "in state %d, event_type %d, event_id %d\n",
1037 status, state, event_type, subtype.chunk);
1038 BUG();
1039 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001040 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041
1042bail:
1043 return error;
1044}
1045
1046/********************************************************************
1047 * 2nd Level Abstractions
1048 ********************************************************************/
1049
1050/* This is the side-effect interpreter. */
1051static int sctp_cmd_interpreter(sctp_event_t event_type,
1052 sctp_subtype_t subtype,
1053 sctp_state_t state,
1054 struct sctp_endpoint *ep,
1055 struct sctp_association *asoc,
1056 void *event_arg,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001057 sctp_disposition_t status,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 sctp_cmd_seq_t *commands,
Al Virodd0fc662005-10-07 07:46:04 +01001059 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060{
1061 int error = 0;
1062 int force;
1063 sctp_cmd_t *cmd;
1064 struct sctp_chunk *new_obj;
1065 struct sctp_chunk *chunk = NULL;
1066 struct sctp_packet *packet;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 struct timer_list *timer;
1068 unsigned long timeout;
1069 struct sctp_transport *t;
1070 struct sctp_sackhdr sackh;
1071 int local_cork = 0;
1072
1073 if (SCTP_EVENT_T_TIMEOUT != event_type)
1074 chunk = (struct sctp_chunk *) event_arg;
1075
1076 /* Note: This whole file is a huge candidate for rework.
1077 * For example, each command could either have its own handler, so
1078 * the loop would look like:
1079 * while (cmds)
1080 * cmd->handle(x, y, z)
1081 * --jgrimm
1082 */
1083 while (NULL != (cmd = sctp_next_cmd(commands))) {
1084 switch (cmd->verb) {
1085 case SCTP_CMD_NOP:
1086 /* Do nothing. */
1087 break;
1088
1089 case SCTP_CMD_NEW_ASOC:
1090 /* Register a new association. */
1091 if (local_cork) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001092 sctp_outq_uncork(&asoc->outqueue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 local_cork = 0;
1094 }
1095 asoc = cmd->obj.ptr;
1096 /* Register with the endpoint. */
1097 sctp_endpoint_add_asoc(ep, asoc);
1098 sctp_hash_established(asoc);
1099 break;
1100
1101 case SCTP_CMD_UPDATE_ASSOC:
1102 sctp_assoc_update(asoc, cmd->obj.ptr);
1103 break;
1104
1105 case SCTP_CMD_PURGE_OUTQUEUE:
1106 sctp_outq_teardown(&asoc->outqueue);
1107 break;
1108
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001109 case SCTP_CMD_DELETE_TCB:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 if (local_cork) {
1111 sctp_outq_uncork(&asoc->outqueue);
1112 local_cork = 0;
1113 }
1114 /* Delete the current association. */
1115 sctp_cmd_delete_tcb(commands, asoc);
1116 asoc = NULL;
1117 break;
1118
1119 case SCTP_CMD_NEW_STATE:
1120 /* Enter a new state. */
1121 sctp_cmd_new_state(commands, asoc, cmd->obj.state);
1122 break;
1123
1124 case SCTP_CMD_REPORT_TSN:
1125 /* Record the arrival of a TSN. */
1126 sctp_tsnmap_mark(&asoc->peer.tsn_map, cmd->obj.u32);
1127 break;
1128
1129 case SCTP_CMD_REPORT_FWDTSN:
1130 /* Move the Cumulattive TSN Ack ahead. */
1131 sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32);
1132
Vlad Yasevichea2dfb32007-07-13 17:01:19 -04001133 /* purge the fragmentation queue */
1134 sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32);
1135
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 /* Abort any in progress partial delivery. */
1137 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
1138 break;
1139
1140 case SCTP_CMD_PROCESS_FWDTSN:
1141 sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.ptr);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001142 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143
1144 case SCTP_CMD_GEN_SACK:
1145 /* Generate a Selective ACK.
1146 * The argument tells us whether to just count
1147 * the packet and MAYBE generate a SACK, or
1148 * force a SACK out.
1149 */
1150 force = cmd->obj.i32;
1151 error = sctp_gen_sack(asoc, force, commands);
1152 break;
1153
1154 case SCTP_CMD_PROCESS_SACK:
1155 /* Process an inbound SACK. */
1156 error = sctp_cmd_process_sack(commands, asoc,
1157 cmd->obj.ptr);
1158 break;
1159
1160 case SCTP_CMD_GEN_INIT_ACK:
1161 /* Generate an INIT ACK chunk. */
1162 new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC,
1163 0);
1164 if (!new_obj)
1165 goto nomem;
1166
1167 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1168 SCTP_CHUNK(new_obj));
1169 break;
1170
1171 case SCTP_CMD_PEER_INIT:
1172 /* Process a unified INIT from the peer.
1173 * Note: Only used during INIT-ACK processing. If
1174 * there is an error just return to the outter
1175 * layer which will bail.
1176 */
1177 error = sctp_cmd_process_init(commands, asoc, chunk,
1178 cmd->obj.ptr, gfp);
1179 break;
1180
1181 case SCTP_CMD_GEN_COOKIE_ECHO:
1182 /* Generate a COOKIE ECHO chunk. */
1183 new_obj = sctp_make_cookie_echo(asoc, chunk);
1184 if (!new_obj) {
1185 if (cmd->obj.ptr)
1186 sctp_chunk_free(cmd->obj.ptr);
1187 goto nomem;
1188 }
1189 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1190 SCTP_CHUNK(new_obj));
1191
1192 /* If there is an ERROR chunk to be sent along with
1193 * the COOKIE_ECHO, send it, too.
1194 */
1195 if (cmd->obj.ptr)
1196 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1197 SCTP_CHUNK(cmd->obj.ptr));
1198
1199 /* FIXME - Eventually come up with a cleaner way to
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001200 * enabling COOKIE-ECHO + DATA bundling during
1201 * multihoming stale cookie scenarios, the following
1202 * command plays with asoc->peer.retran_path to
1203 * avoid the problem of sending the COOKIE-ECHO and
1204 * DATA in different paths, which could result
1205 * in the association being ABORTed if the DATA chunk
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206 * is processed first by the server. Checking the
1207 * init error counter simply causes this command
1208 * to be executed only during failed attempts of
1209 * association establishment.
1210 */
Frank Filz3f7a87d2005-06-20 13:14:57 -07001211 if ((asoc->peer.retran_path !=
1212 asoc->peer.primary_path) &&
1213 (asoc->init_err_counter > 0)) {
1214 sctp_add_cmd_sf(commands,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001215 SCTP_CMD_FORCE_PRIM_RETRAN,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 SCTP_NULL());
1217 }
1218
1219 break;
1220
1221 case SCTP_CMD_GEN_SHUTDOWN:
1222 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1223 * Reset error counts.
1224 */
1225 asoc->overall_error_count = 0;
1226
1227 /* Generate a SHUTDOWN chunk. */
1228 new_obj = sctp_make_shutdown(asoc, chunk);
1229 if (!new_obj)
1230 goto nomem;
1231 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1232 SCTP_CHUNK(new_obj));
1233 break;
1234
1235 case SCTP_CMD_CHUNK_ULP:
1236 /* Send a chunk to the sockets layer. */
1237 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1238 "chunk_up:", cmd->obj.ptr,
1239 "ulpq:", &asoc->ulpq);
1240 sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.ptr,
1241 GFP_ATOMIC);
1242 break;
1243
1244 case SCTP_CMD_EVENT_ULP:
1245 /* Send a notification to the sockets layer. */
1246 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1247 "event_up:",cmd->obj.ptr,
1248 "ulpq:",&asoc->ulpq);
1249 sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ptr);
1250 break;
1251
1252 case SCTP_CMD_REPLY:
1253 /* If an caller has not already corked, do cork. */
1254 if (!asoc->outqueue.cork) {
1255 sctp_outq_cork(&asoc->outqueue);
1256 local_cork = 1;
1257 }
1258 /* Send a chunk to our peer. */
1259 error = sctp_outq_tail(&asoc->outqueue, cmd->obj.ptr);
1260 break;
1261
1262 case SCTP_CMD_SEND_PKT:
1263 /* Send a full packet to our peer. */
1264 packet = cmd->obj.ptr;
1265 sctp_packet_transmit(packet);
1266 sctp_ootb_pkt_free(packet);
1267 break;
1268
Vlad Yasevichb6157d82007-10-24 15:59:16 -04001269 case SCTP_CMD_T1_RETRAN:
1270 /* Mark a transport for retransmission. */
1271 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1272 SCTP_RTXR_T1_RTX);
1273 break;
1274
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 case SCTP_CMD_RETRAN:
1276 /* Mark a transport for retransmission. */
1277 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1278 SCTP_RTXR_T3_RTX);
1279 break;
1280
1281 case SCTP_CMD_TRANSMIT:
1282 /* Kick start transmission. */
1283 error = sctp_outq_uncork(&asoc->outqueue);
1284 local_cork = 0;
1285 break;
1286
1287 case SCTP_CMD_ECN_CE:
1288 /* Do delayed CE processing. */
1289 sctp_do_ecn_ce_work(asoc, cmd->obj.u32);
1290 break;
1291
1292 case SCTP_CMD_ECN_ECNE:
1293 /* Do delayed ECNE processing. */
1294 new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32,
1295 chunk);
1296 if (new_obj)
1297 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1298 SCTP_CHUNK(new_obj));
1299 break;
1300
1301 case SCTP_CMD_ECN_CWR:
1302 /* Do delayed CWR processing. */
1303 sctp_do_ecn_cwr_work(asoc, cmd->obj.u32);
1304 break;
1305
1306 case SCTP_CMD_SETUP_T2:
1307 sctp_cmd_setup_t2(commands, asoc, cmd->obj.ptr);
1308 break;
1309
1310 case SCTP_CMD_TIMER_START:
1311 timer = &asoc->timers[cmd->obj.to];
1312 timeout = asoc->timeouts[cmd->obj.to];
Kris Katterjohn09a62662006-01-08 22:24:28 -08001313 BUG_ON(!timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314
1315 timer->expires = jiffies + timeout;
1316 sctp_association_hold(asoc);
1317 add_timer(timer);
1318 break;
1319
1320 case SCTP_CMD_TIMER_RESTART:
1321 timer = &asoc->timers[cmd->obj.to];
1322 timeout = asoc->timeouts[cmd->obj.to];
1323 if (!mod_timer(timer, jiffies + timeout))
1324 sctp_association_hold(asoc);
1325 break;
1326
1327 case SCTP_CMD_TIMER_STOP:
1328 timer = &asoc->timers[cmd->obj.to];
1329 if (timer_pending(timer) && del_timer(timer))
1330 sctp_association_put(asoc);
1331 break;
1332
Frank Filz3f7a87d2005-06-20 13:14:57 -07001333 case SCTP_CMD_INIT_CHOOSE_TRANSPORT:
1334 chunk = cmd->obj.ptr;
1335 t = sctp_assoc_choose_init_transport(asoc);
1336 asoc->init_last_sent_to = t;
1337 chunk->transport = t;
1338 t->init_sent_count++;
1339 break;
1340
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 case SCTP_CMD_INIT_RESTART:
1342 /* Do the needed accounting and updates
1343 * associated with restarting an initialization
Frank Filz3f7a87d2005-06-20 13:14:57 -07001344 * timer. Only multiply the timeout by two if
1345 * all transports have been tried at the current
1346 * timeout.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 */
Frank Filz3f7a87d2005-06-20 13:14:57 -07001348 t = asoc->init_last_sent_to;
1349 asoc->init_err_counter++;
1350
1351 if (t->init_sent_count > (asoc->init_cycle + 1)) {
1352 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] *= 2;
1353 if (asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] >
1354 asoc->max_init_timeo) {
1355 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
1356 asoc->max_init_timeo;
1357 }
1358 asoc->init_cycle++;
1359 SCTP_DEBUG_PRINTK(
1360 "T1 INIT Timeout adjustment"
1361 " init_err_counter: %d"
1362 " cycle: %d"
Vlad Yasevich8116ffa2006-01-17 11:55:17 -08001363 " timeout: %ld\n",
Frank Filz3f7a87d2005-06-20 13:14:57 -07001364 asoc->init_err_counter,
1365 asoc->init_cycle,
1366 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT]);
1367 }
1368
1369 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
1370 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
1371 break;
1372
1373 case SCTP_CMD_COOKIEECHO_RESTART:
1374 /* Do the needed accounting and updates
1375 * associated with restarting an initialization
1376 * timer. Only multiply the timeout by two if
1377 * all transports have been tried at the current
1378 * timeout.
1379 */
1380 asoc->init_err_counter++;
1381
1382 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] *= 2;
1383 if (asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] >
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384 asoc->max_init_timeo) {
Frank Filz3f7a87d2005-06-20 13:14:57 -07001385 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 asoc->max_init_timeo;
1387 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07001388 SCTP_DEBUG_PRINTK(
1389 "T1 COOKIE Timeout adjustment"
1390 " init_err_counter: %d"
Vlad Yasevich8116ffa2006-01-17 11:55:17 -08001391 " timeout: %ld\n",
Frank Filz3f7a87d2005-06-20 13:14:57 -07001392 asoc->init_err_counter,
1393 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394
1395 /* If we've sent any data bundled with
1396 * COOKIE-ECHO we need to resend.
1397 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07001398 list_for_each_entry(t, &asoc->peer.transport_addr_list,
1399 transports) {
Vlad Yasevichb6157d82007-10-24 15:59:16 -04001400 sctp_retransmit_mark(&asoc->outqueue, t,
1401 SCTP_RTXR_T1_RTX);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 }
1403
1404 sctp_add_cmd_sf(commands,
1405 SCTP_CMD_TIMER_RESTART,
Frank Filz3f7a87d2005-06-20 13:14:57 -07001406 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 break;
1408
1409 case SCTP_CMD_INIT_FAILED:
Al Virodc251b22006-11-20 17:00:44 -08001410 sctp_cmd_init_failed(commands, asoc, cmd->obj.err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411 break;
1412
1413 case SCTP_CMD_ASSOC_FAILED:
1414 sctp_cmd_assoc_failed(commands, asoc, event_type,
Al Viro5be291f2006-11-20 17:01:06 -08001415 subtype, chunk, cmd->obj.err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 break;
1417
Frank Filz3f7a87d2005-06-20 13:14:57 -07001418 case SCTP_CMD_INIT_COUNTER_INC:
1419 asoc->init_err_counter++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 break;
1421
Frank Filz3f7a87d2005-06-20 13:14:57 -07001422 case SCTP_CMD_INIT_COUNTER_RESET:
1423 asoc->init_err_counter = 0;
1424 asoc->init_cycle = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 break;
1426
1427 case SCTP_CMD_REPORT_DUP:
1428 sctp_tsnmap_mark_dup(&asoc->peer.tsn_map,
1429 cmd->obj.u32);
1430 break;
1431
1432 case SCTP_CMD_REPORT_BAD_TAG:
1433 SCTP_DEBUG_PRINTK("vtag mismatch!\n");
1434 break;
1435
1436 case SCTP_CMD_STRIKE:
1437 /* Mark one strike against a transport. */
1438 sctp_do_8_2_transport_strike(asoc, cmd->obj.transport);
1439 break;
1440
1441 case SCTP_CMD_TRANSPORT_RESET:
1442 t = cmd->obj.transport;
1443 sctp_cmd_transport_reset(commands, asoc, t);
1444 break;
1445
1446 case SCTP_CMD_TRANSPORT_ON:
1447 t = cmd->obj.transport;
1448 sctp_cmd_transport_on(commands, asoc, t, chunk);
1449 break;
1450
1451 case SCTP_CMD_HB_TIMERS_START:
1452 sctp_cmd_hb_timers_start(commands, asoc);
1453 break;
1454
1455 case SCTP_CMD_HB_TIMER_UPDATE:
1456 t = cmd->obj.transport;
Gui Jianfeng765ff022008-04-12 18:55:12 -07001457 sctp_cmd_hb_timer_update(commands, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458 break;
1459
1460 case SCTP_CMD_HB_TIMERS_STOP:
1461 sctp_cmd_hb_timers_stop(commands, asoc);
1462 break;
1463
1464 case SCTP_CMD_REPORT_ERROR:
1465 error = cmd->obj.error;
1466 break;
1467
1468 case SCTP_CMD_PROCESS_CTSN:
1469 /* Dummy up a SACK for processing. */
Al Viro2178eda2006-11-20 17:26:53 -08001470 sackh.cum_tsn_ack = cmd->obj.be32;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 sackh.a_rwnd = 0;
1472 sackh.num_gap_ack_blocks = 0;
1473 sackh.num_dup_tsns = 0;
1474 sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK,
1475 SCTP_SACKH(&sackh));
1476 break;
1477
1478 case SCTP_CMD_DISCARD_PACKET:
Vlad Yasevich2e3216c2008-06-19 16:08:18 -07001479 /* We need to discard the whole packet.
1480 * Uncork the queue since there might be
1481 * responses pending
1482 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 chunk->pdiscard = 1;
Vlad Yasevich2e3216c2008-06-19 16:08:18 -07001484 if (asoc) {
1485 sctp_outq_uncork(&asoc->outqueue);
1486 local_cork = 0;
1487 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488 break;
1489
1490 case SCTP_CMD_RTO_PENDING:
1491 t = cmd->obj.transport;
1492 t->rto_pending = 1;
1493 break;
1494
1495 case SCTP_CMD_PART_DELIVER:
1496 sctp_ulpq_partial_delivery(&asoc->ulpq, cmd->obj.ptr,
1497 GFP_ATOMIC);
1498 break;
1499
1500 case SCTP_CMD_RENEGE:
1501 sctp_ulpq_renege(&asoc->ulpq, cmd->obj.ptr,
1502 GFP_ATOMIC);
1503 break;
1504
1505 case SCTP_CMD_SETUP_T4:
1506 sctp_cmd_setup_t4(commands, asoc, cmd->obj.ptr);
1507 break;
1508
1509 case SCTP_CMD_PROCESS_OPERR:
1510 sctp_cmd_process_operr(commands, asoc, chunk);
1511 break;
1512 case SCTP_CMD_CLEAR_INIT_TAG:
1513 asoc->peer.i.init_tag = 0;
1514 break;
1515 case SCTP_CMD_DEL_NON_PRIMARY:
1516 sctp_cmd_del_non_primary(asoc);
1517 break;
1518 case SCTP_CMD_T3_RTX_TIMERS_STOP:
1519 sctp_cmd_t3_rtx_timers_stop(commands, asoc);
1520 break;
1521 case SCTP_CMD_FORCE_PRIM_RETRAN:
1522 t = asoc->peer.retran_path;
1523 asoc->peer.retran_path = asoc->peer.primary_path;
1524 error = sctp_outq_uncork(&asoc->outqueue);
1525 local_cork = 0;
1526 asoc->peer.retran_path = t;
1527 break;
Sridhar Samudrala8de8c872006-05-19 10:58:12 -07001528 case SCTP_CMD_SET_SK_ERR:
1529 sctp_cmd_set_sk_err(asoc, cmd->obj.error);
1530 break;
Vlad Yasevich07d93962007-05-04 13:55:27 -07001531 case SCTP_CMD_ASSOC_CHANGE:
1532 sctp_cmd_assoc_change(commands, asoc,
1533 cmd->obj.u8);
1534 break;
1535 case SCTP_CMD_ADAPTATION_IND:
1536 sctp_cmd_adaptation_ind(commands, asoc);
1537 break;
1538
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07001539 case SCTP_CMD_ASSOC_SHKEY:
1540 error = sctp_auth_asoc_init_active_key(asoc,
1541 GFP_ATOMIC);
1542 break;
Gui Jianfengf4ad85c2008-04-12 18:39:34 -07001543 case SCTP_CMD_UPDATE_INITTAG:
1544 asoc->peer.i.init_tag = cmd->obj.u32;
1545 break;
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07001546
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547 default:
1548 printk(KERN_WARNING "Impossible command: %u, %p\n",
1549 cmd->verb, cmd->obj.ptr);
1550 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001551 }
1552
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553 if (error)
1554 break;
1555 }
1556
1557out:
Vlad Yasevich2e3216c2008-06-19 16:08:18 -07001558 /* If this is in response to a received chunk, wait until
1559 * we are done with the packet to open the queue so that we don't
1560 * send multiple packets in response to a single request.
1561 */
1562 if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) {
1563 if (chunk->end_of_packet || chunk->singleton)
1564 sctp_outq_uncork(&asoc->outqueue);
1565 } else if (local_cork)
1566 sctp_outq_uncork(&asoc->outqueue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567 return error;
1568nomem:
1569 error = -ENOMEM;
1570 goto out;
1571}
1572