blob: 8674d49195561fc7ed33a5b086eb4014d80f46a7 [file] [log] [blame]
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,
Vlad Yasevich7e990132009-03-02 09:46:14 +0000437 struct sctp_transport *transport,
438 int is_hb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439{
440 /* The check for association's overall error counter exceeding the
441 * threshold is done in the state function.
442 */
Vlad Yasevichb9f84782009-08-26 09:36:25 -0400443 /* We are here due to a timer expiration. If the timer was
444 * not a HEARTBEAT, then normal error tracking is done.
445 * If the timer was a heartbeat, we only increment error counts
446 * when we already have an outstanding HEARTBEAT that has not
447 * been acknowledged.
448 * Additionaly, some tranport states inhibit error increments.
Sridhar Samudralaad8fec12006-07-21 14:48:50 -0700449 */
Vlad Yasevichb9f84782009-08-26 09:36:25 -0400450 if (!is_hb) {
Sridhar Samudralaad8fec12006-07-21 14:48:50 -0700451 asoc->overall_error_count++;
Vlad Yasevichb9f84782009-08-26 09:36:25 -0400452 if (transport->state != SCTP_INACTIVE)
453 transport->error_count++;
454 } else if (transport->hb_sent) {
455 if (transport->state != SCTP_UNCONFIRMED)
456 asoc->overall_error_count++;
457 if (transport->state != SCTP_INACTIVE)
458 transport->error_count++;
459 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
Frank Filz3f7a87d2005-06-20 13:14:57 -0700461 if (transport->state != SCTP_INACTIVE &&
Vlad Yasevichb9f84782009-08-26 09:36:25 -0400462 (transport->error_count > transport->pathmaxrxt)) {
Frank Filz3f7a87d2005-06-20 13:14:57 -0700463 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
464 " transport IP: port:%d failed.\n",
465 asoc,
Al Virob3f5b3b2006-11-20 17:22:43 -0800466 (&transport->ipaddr),
467 ntohs(transport->ipaddr.v4.sin_port));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 sctp_assoc_control_transport(asoc, transport,
469 SCTP_TRANSPORT_DOWN,
470 SCTP_FAILED_THRESHOLD);
471 }
472
473 /* E2) For the destination address for which the timer
474 * expires, set RTO <- RTO * 2 ("back off the timer"). The
475 * maximum value discussed in rule C7 above (RTO.max) may be
476 * used to provide an upper bound to this doubling operation.
Vlad Yasevichfaee47c2009-02-13 08:33:43 +0000477 *
478 * Special Case: the first HB doesn't trigger exponential backoff.
479 * The first unacknowleged HB triggers it. We do this with a flag
480 * that indicates that we have an outstanding HB.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 */
Vlad Yasevich7e990132009-03-02 09:46:14 +0000482 if (!is_hb || transport->hb_sent) {
Vlad Yasevichfaee47c2009-02-13 08:33:43 +0000483 transport->last_rto = transport->rto;
484 transport->rto = min((transport->rto * 2), transport->asoc->rto_max);
485 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486}
487
488/* Worker routine to handle INIT command failure. */
489static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands,
490 struct sctp_association *asoc,
491 unsigned error)
492{
493 struct sctp_ulpevent *event;
494
495 event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC,
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700496 (__u16)error, 0, 0, NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 GFP_ATOMIC);
498
499 if (event)
500 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
501 SCTP_ULPEVENT(event));
502
503 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
504 SCTP_STATE(SCTP_STATE_CLOSED));
505
506 /* SEND_FAILED sent later when cleaning up the association. */
507 asoc->outqueue.error = error;
508 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
509}
510
511/* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
512static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands,
513 struct sctp_association *asoc,
514 sctp_event_t event_type,
515 sctp_subtype_t subtype,
516 struct sctp_chunk *chunk,
517 unsigned error)
518{
519 struct sctp_ulpevent *event;
520
521 /* Cancel any partial delivery in progress. */
522 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
523
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700524 if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT)
525 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
526 (__u16)error, 0, 0, chunk,
527 GFP_ATOMIC);
528 else
529 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
530 (__u16)error, 0, 0, NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 GFP_ATOMIC);
532 if (event)
533 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
534 SCTP_ULPEVENT(event));
535
536 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
537 SCTP_STATE(SCTP_STATE_CLOSED));
538
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 /* SEND_FAILED sent later when cleaning up the association. */
540 asoc->outqueue.error = error;
541 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
542}
543
544/* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
545 * inside the cookie. In reality, this is only used for INIT-ACK processing
546 * since all other cases use "temporary" associations and can do all
547 * their work in statefuns directly.
548 */
549static int sctp_cmd_process_init(sctp_cmd_seq_t *commands,
550 struct sctp_association *asoc,
551 struct sctp_chunk *chunk,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -0700552 sctp_init_chunk_t *peer_init,
Al Virodd0fc662005-10-07 07:46:04 +0100553 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554{
555 int error;
556
557 /* We only process the init as a sideeffect in a single
558 * case. This is when we process the INIT-ACK. If we
559 * fail during INIT processing (due to malloc problems),
560 * just return the error and stop processing the stack.
561 */
562 if (!sctp_process_init(asoc, chunk->chunk_hdr->type,
563 sctp_source(chunk), peer_init, gfp))
564 error = -ENOMEM;
565 else
566 error = 0;
567
568 return error;
569}
570
571/* Helper function to break out starting up of heartbeat timers. */
572static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds,
573 struct sctp_association *asoc)
574{
575 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
577 /* Start a heartbeat timer for each transport on the association.
578 * hold a reference on the transport to make sure none of
579 * the needed data structures go away.
580 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700581 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
583 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
584 sctp_transport_hold(t);
585 }
586}
587
588static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds,
589 struct sctp_association *asoc)
590{
591 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
593 /* Stop all heartbeat timers. */
594
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700595 list_for_each_entry(t, &asoc->peer.transport_addr_list,
596 transports) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 if (del_timer(&t->hb_timer))
598 sctp_transport_put(t);
599 }
600}
601
602/* Helper function to stop any pending T3-RTX timers */
603static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900604 struct sctp_association *asoc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605{
606 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700608 list_for_each_entry(t, &asoc->peer.transport_addr_list,
609 transports) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 if (timer_pending(&t->T3_rtx_timer) &&
611 del_timer(&t->T3_rtx_timer)) {
612 sctp_transport_put(t);
613 }
614 }
615}
616
617
618/* Helper function to update the heartbeat timer. */
619static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 struct sctp_transport *t)
621{
622 /* Update the heartbeat timer. */
623 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
624 sctp_transport_hold(t);
625}
626
627/* Helper function to handle the reception of an HEARTBEAT ACK. */
628static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
629 struct sctp_association *asoc,
630 struct sctp_transport *t,
631 struct sctp_chunk *chunk)
632{
633 sctp_sender_hb_info_t *hbinfo;
634
635 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
636 * HEARTBEAT should clear the error counter of the destination
637 * transport address to which the HEARTBEAT was sent.
638 * The association's overall error count is also cleared.
639 */
640 t->error_count = 0;
641 t->asoc->overall_error_count = 0;
642
Vlad Yasevichfaee47c2009-02-13 08:33:43 +0000643 /* Clear the hb_sent flag to signal that we had a good
644 * acknowledgement.
645 */
646 t->hb_sent = 0;
647
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 /* Mark the destination transport address as active if it is not so
649 * marked.
650 */
Sridhar Samudralaad8fec12006-07-21 14:48:50 -0700651 if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
653 SCTP_HEARTBEAT_SUCCESS);
654
655 /* The receiver of the HEARTBEAT ACK should also perform an
656 * RTT measurement for that destination transport address
657 * using the time value carried in the HEARTBEAT ACK chunk.
Vlad Yaseviche533ca12007-01-30 14:36:14 -0800658 * If the transport's rto_pending variable has been cleared,
659 * it was most likely due to a retransmit. However, we want
660 * to re-enable it to properly update the rto.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 */
Vlad Yaseviche533ca12007-01-30 14:36:14 -0800662 if (t->rto_pending == 0)
663 t->rto_pending = 1;
664
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data;
666 sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at));
Sridhar Samudralaad8fec12006-07-21 14:48:50 -0700667
668 /* Update the heartbeat timer. */
669 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
670 sctp_transport_hold(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671}
672
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673
674/* Helper function to process the process SACK command. */
675static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds,
676 struct sctp_association *asoc,
677 struct sctp_sackhdr *sackh)
678{
Vlad Yasevich2e3216c2008-06-19 16:08:18 -0700679 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680
681 if (sctp_outq_sack(&asoc->outqueue, sackh)) {
682 /* There are no more TSNs awaiting SACK. */
683 err = sctp_do_sm(SCTP_EVENT_T_OTHER,
684 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN),
685 asoc->state, asoc->ep, asoc, NULL,
686 GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 }
688
689 return err;
690}
691
692/* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
693 * the transport for a shutdown chunk.
694 */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900695static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 struct sctp_association *asoc,
697 struct sctp_chunk *chunk)
698{
699 struct sctp_transport *t;
700
Wei Yongjun9919b452009-05-12 21:52:51 +0800701 t = sctp_assoc_choose_alter_transport(asoc,
702 asoc->shutdown_last_sent_to);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 asoc->shutdown_last_sent_to = t;
704 asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto;
705 chunk->transport = t;
706}
707
708/* Helper function to change the state of an association. */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900709static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 struct sctp_association *asoc,
711 sctp_state_t state)
712{
713 struct sock *sk = asoc->base.sk;
714
715 asoc->state = state;
716
Frank Filz3f7a87d2005-06-20 13:14:57 -0700717 SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n",
718 asoc, sctp_state_tbl[state]);
719
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 if (sctp_style(sk, TCP)) {
Frank Filz3f7a87d2005-06-20 13:14:57 -0700721 /* Change the sk->sk_state of a TCP-style socket that has
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 * sucessfully completed a connect() call.
723 */
724 if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED))
725 sk->sk_state = SCTP_SS_ESTABLISHED;
726
727 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
728 if (sctp_state(asoc, SHUTDOWN_RECEIVED) &&
729 sctp_sstate(sk, ESTABLISHED))
730 sk->sk_shutdown |= RCV_SHUTDOWN;
731 }
732
Frank Filz3f7a87d2005-06-20 13:14:57 -0700733 if (sctp_state(asoc, COOKIE_WAIT)) {
734 /* Reset init timeouts since they may have been
735 * increased due to timer expirations.
736 */
737 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
Vladislav Yasevich1e7d3d92005-11-11 16:06:16 -0800738 asoc->rto_initial;
Frank Filz3f7a87d2005-06-20 13:14:57 -0700739 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
Vladislav Yasevich1e7d3d92005-11-11 16:06:16 -0800740 asoc->rto_initial;
Frank Filz3f7a87d2005-06-20 13:14:57 -0700741 }
742
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 if (sctp_state(asoc, ESTABLISHED) ||
744 sctp_state(asoc, CLOSED) ||
745 sctp_state(asoc, SHUTDOWN_RECEIVED)) {
746 /* Wake up any processes waiting in the asoc's wait queue in
747 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900748 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 if (waitqueue_active(&asoc->wait))
750 wake_up_interruptible(&asoc->wait);
751
752 /* Wake up any processes waiting in the sk's sleep queue of
753 * a TCP-style or UDP-style peeled-off socket in
754 * sctp_wait_for_accept() or sctp_wait_for_packet().
755 * For a UDP-style socket, the waiters are woken up by the
756 * notifications.
757 */
758 if (!sctp_style(sk, UDP))
759 sk->sk_state_change(sk);
760 }
761}
762
763/* Helper function to delete an association. */
764static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds,
765 struct sctp_association *asoc)
766{
767 struct sock *sk = asoc->base.sk;
768
769 /* If it is a non-temporary association belonging to a TCP-style
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900770 * listening socket that is not closed, do not free it so that accept()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 * can pick it up later.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900772 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) &&
774 (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK))
775 return;
776
777 sctp_unhash_established(asoc);
778 sctp_association_free(asoc);
779}
780
781/*
782 * ADDIP Section 4.1 ASCONF Chunk Procedures
783 * A4) Start a T-4 RTO timer, using the RTO value of the selected
784 * destination address (we use active path instead of primary path just
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900785 * because primary path may be inactive.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 */
787static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds,
788 struct sctp_association *asoc,
789 struct sctp_chunk *chunk)
790{
791 struct sctp_transport *t;
792
Wei Yongjun9919b452009-05-12 21:52:51 +0800793 t = sctp_assoc_choose_alter_transport(asoc, chunk->transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto;
795 chunk->transport = t;
796}
797
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900798/* Process an incoming Operation Error Chunk. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds,
800 struct sctp_association *asoc,
801 struct sctp_chunk *chunk)
802{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 struct sctp_errhdr *err_hdr;
Wei Yongjun3df26782009-03-02 06:46:51 +0000804 struct sctp_ulpevent *ev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805
Wei Yongjun3df26782009-03-02 06:46:51 +0000806 while (chunk->chunk_end > chunk->skb->data) {
807 err_hdr = (struct sctp_errhdr *)(chunk->skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808
Wei Yongjun3df26782009-03-02 06:46:51 +0000809 ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0,
810 GFP_ATOMIC);
811 if (!ev)
812 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
Wei Yongjun3df26782009-03-02 06:46:51 +0000814 sctp_ulpq_tail_event(&asoc->ulpq, ev);
815
816 switch (err_hdr->cause) {
817 case SCTP_ERROR_UNKNOWN_CHUNK:
818 {
819 sctp_chunkhdr_t *unk_chunk_hdr;
820
821 unk_chunk_hdr = (sctp_chunkhdr_t *)err_hdr->variable;
822 switch (unk_chunk_hdr->type) {
823 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with
824 * an ERROR chunk reporting that it did not recognized
825 * the ASCONF chunk type, the sender of the ASCONF MUST
826 * NOT send any further ASCONF chunks and MUST stop its
827 * T-4 timer.
828 */
829 case SCTP_CID_ASCONF:
830 if (asoc->peer.asconf_capable == 0)
831 break;
832
833 asoc->peer.asconf_capable = 0;
834 sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO));
Wei Yongjun3df26782009-03-02 06:46:51 +0000836 break;
837 default:
838 break;
839 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 break;
Wei Yongjun3df26782009-03-02 06:46:51 +0000841 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 default:
843 break;
844 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 }
846}
847
848/* Process variable FWDTSN chunk information. */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900849static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 struct sctp_chunk *chunk)
851{
852 struct sctp_fwdtsn_skip *skip;
853 /* Walk through all the skipped SSNs */
854 sctp_walk_fwdtsn(skip, chunk) {
855 sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn));
856 }
857
858 return;
859}
860
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900861/* Helper function to remove the association non-primary peer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 * transports.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900863 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864static void sctp_cmd_del_non_primary(struct sctp_association *asoc)
865{
866 struct sctp_transport *t;
867 struct list_head *pos;
868 struct list_head *temp;
869
870 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
871 t = list_entry(pos, struct sctp_transport, transports);
Al Viro5f242a12006-11-20 17:05:23 -0800872 if (!sctp_cmp_addr_exact(&t->ipaddr,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900873 &asoc->peer.primary_addr)) {
Al Viro38a03142006-11-20 17:06:45 -0800874 sctp_assoc_del_peer(asoc, &t->ipaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 }
876 }
877
878 return;
879}
880
Sridhar Samudrala8de8c872006-05-19 10:58:12 -0700881/* Helper function to set sk_err on a 1-1 style socket. */
882static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error)
883{
884 struct sock *sk = asoc->base.sk;
885
886 if (!sctp_style(sk, UDP))
887 sk->sk_err = error;
888}
889
Vlad Yasevich07d93962007-05-04 13:55:27 -0700890/* Helper function to generate an association change event */
891static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands,
892 struct sctp_association *asoc,
893 u8 state)
894{
895 struct sctp_ulpevent *ev;
896
897 ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0,
898 asoc->c.sinit_num_ostreams,
899 asoc->c.sinit_max_instreams,
900 NULL, GFP_ATOMIC);
901 if (ev)
902 sctp_ulpq_tail_event(&asoc->ulpq, ev);
903}
904
905/* Helper function to generate an adaptation indication event */
906static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands,
907 struct sctp_association *asoc)
908{
909 struct sctp_ulpevent *ev;
910
911 ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC);
912
913 if (ev)
914 sctp_ulpq_tail_event(&asoc->ulpq, ev);
915}
916
Vlad Yasevich96cd0d32008-09-08 14:00:26 -0400917
918static void sctp_cmd_t1_timer_update(struct sctp_association *asoc,
919 sctp_event_timeout_t timer,
920 char *name)
921{
922 struct sctp_transport *t;
923
924 t = asoc->init_last_sent_to;
925 asoc->init_err_counter++;
926
927 if (t->init_sent_count > (asoc->init_cycle + 1)) {
928 asoc->timeouts[timer] *= 2;
929 if (asoc->timeouts[timer] > asoc->max_init_timeo) {
930 asoc->timeouts[timer] = asoc->max_init_timeo;
931 }
932 asoc->init_cycle++;
933 SCTP_DEBUG_PRINTK(
934 "T1 %s Timeout adjustment"
935 " init_err_counter: %d"
936 " cycle: %d"
937 " timeout: %ld\n",
938 name,
939 asoc->init_err_counter,
940 asoc->init_cycle,
941 asoc->timeouts[timer]);
942 }
943
944}
945
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -0400946/* Send the whole message, chunk by chunk, to the outqueue.
947 * This way the whole message is queued up and bundling if
948 * encouraged for small fragments.
949 */
950static int sctp_cmd_send_msg(struct sctp_association *asoc,
951 struct sctp_datamsg *msg)
952{
953 struct sctp_chunk *chunk;
954 int error = 0;
955
956 list_for_each_entry(chunk, &msg->chunks, frag_list) {
957 error = sctp_outq_tail(&asoc->outqueue, chunk);
958 if (error)
959 break;
960 }
961
962 return error;
963}
964
965
966
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967/* These three macros allow us to pull the debugging code out of the
968 * main flow of sctp_do_sm() to keep attention focused on the real
969 * functionality there.
970 */
971#define DEBUG_PRE \
972 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
973 "ep %p, %s, %s, asoc %p[%s], %s\n", \
974 ep, sctp_evttype_tbl[event_type], \
975 (*debug_fn)(subtype), asoc, \
976 sctp_state_tbl[state], state_fn->name)
977
978#define DEBUG_POST \
979 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
980 "asoc %p, status: %s\n", \
981 asoc, sctp_status_tbl[status])
982
983#define DEBUG_POST_SFX \
984 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
985 error, asoc, \
986 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
987 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
988
989/*
990 * This is the master state machine processing function.
991 *
992 * If you want to understand all of lksctp, this is a
993 * good place to start.
994 */
995int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype,
996 sctp_state_t state,
997 struct sctp_endpoint *ep,
998 struct sctp_association *asoc,
999 void *event_arg,
Al Virodd0fc662005-10-07 07:46:04 +01001000 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001{
1002 sctp_cmd_seq_t commands;
1003 const sctp_sm_table_entry_t *state_fn;
1004 sctp_disposition_t status;
1005 int error = 0;
1006 typedef const char *(printfn_t)(sctp_subtype_t);
1007
1008 static printfn_t *table[] = {
1009 NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname,
1010 };
1011 printfn_t *debug_fn __attribute__ ((unused)) = table[event_type];
1012
1013 /* Look up the state function, run it, and then process the
1014 * side effects. These three steps are the heart of lksctp.
1015 */
1016 state_fn = sctp_sm_lookup_event(event_type, state, subtype);
1017
1018 sctp_init_cmd_seq(&commands);
1019
1020 DEBUG_PRE;
1021 status = (*state_fn->fn)(ep, asoc, subtype, event_arg, &commands);
1022 DEBUG_POST;
1023
1024 error = sctp_side_effects(event_type, subtype, state,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001025 ep, asoc, event_arg, status,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 &commands, gfp);
1027 DEBUG_POST_SFX;
1028
1029 return error;
1030}
1031
1032#undef DEBUG_PRE
1033#undef DEBUG_POST
1034
1035/*****************************************************************
1036 * This the master state function side effect processing function.
1037 *****************************************************************/
1038static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
1039 sctp_state_t state,
1040 struct sctp_endpoint *ep,
1041 struct sctp_association *asoc,
1042 void *event_arg,
1043 sctp_disposition_t status,
1044 sctp_cmd_seq_t *commands,
Al Virodd0fc662005-10-07 07:46:04 +01001045 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046{
1047 int error;
1048
1049 /* FIXME - Most of the dispositions left today would be categorized
1050 * as "exceptional" dispositions. For those dispositions, it
1051 * may not be proper to run through any of the commands at all.
1052 * For example, the command interpreter might be run only with
1053 * disposition SCTP_DISPOSITION_CONSUME.
1054 */
1055 if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state,
1056 ep, asoc,
1057 event_arg, status,
1058 commands, gfp)))
1059 goto bail;
1060
1061 switch (status) {
1062 case SCTP_DISPOSITION_DISCARD:
1063 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
1064 "event_type %d, event_id %d\n",
1065 state, event_type, subtype.chunk);
1066 break;
1067
1068 case SCTP_DISPOSITION_NOMEM:
1069 /* We ran out of memory, so we need to discard this
1070 * packet.
1071 */
1072 /* BUG--we should now recover some memory, probably by
1073 * reneging...
1074 */
1075 error = -ENOMEM;
1076 break;
1077
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001078 case SCTP_DISPOSITION_DELETE_TCB:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 /* This should now be a command. */
1080 break;
1081
1082 case SCTP_DISPOSITION_CONSUME:
1083 case SCTP_DISPOSITION_ABORT:
1084 /*
1085 * We should no longer have much work to do here as the
1086 * real work has been done as explicit commands above.
1087 */
1088 break;
1089
1090 case SCTP_DISPOSITION_VIOLATION:
Wei Yongjund99fa422007-08-27 11:19:24 +08001091 if (net_ratelimit())
1092 printk(KERN_ERR "sctp protocol violation state %d "
1093 "chunkid %d\n", state, subtype.chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 break;
1095
1096 case SCTP_DISPOSITION_NOT_IMPL:
1097 printk(KERN_WARNING "sctp unimplemented feature in state %d, "
1098 "event_type %d, event_id %d\n",
1099 state, event_type, subtype.chunk);
1100 break;
1101
1102 case SCTP_DISPOSITION_BUG:
1103 printk(KERN_ERR "sctp bug in state %d, "
1104 "event_type %d, event_id %d\n",
1105 state, event_type, subtype.chunk);
1106 BUG();
1107 break;
1108
1109 default:
1110 printk(KERN_ERR "sctp impossible disposition %d "
1111 "in state %d, event_type %d, event_id %d\n",
1112 status, state, event_type, subtype.chunk);
1113 BUG();
1114 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001115 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116
1117bail:
1118 return error;
1119}
1120
1121/********************************************************************
1122 * 2nd Level Abstractions
1123 ********************************************************************/
1124
1125/* This is the side-effect interpreter. */
1126static int sctp_cmd_interpreter(sctp_event_t event_type,
1127 sctp_subtype_t subtype,
1128 sctp_state_t state,
1129 struct sctp_endpoint *ep,
1130 struct sctp_association *asoc,
1131 void *event_arg,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001132 sctp_disposition_t status,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 sctp_cmd_seq_t *commands,
Al Virodd0fc662005-10-07 07:46:04 +01001134 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135{
1136 int error = 0;
1137 int force;
1138 sctp_cmd_t *cmd;
1139 struct sctp_chunk *new_obj;
1140 struct sctp_chunk *chunk = NULL;
1141 struct sctp_packet *packet;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 struct timer_list *timer;
1143 unsigned long timeout;
1144 struct sctp_transport *t;
1145 struct sctp_sackhdr sackh;
1146 int local_cork = 0;
1147
1148 if (SCTP_EVENT_T_TIMEOUT != event_type)
1149 chunk = (struct sctp_chunk *) event_arg;
1150
1151 /* Note: This whole file is a huge candidate for rework.
1152 * For example, each command could either have its own handler, so
1153 * the loop would look like:
1154 * while (cmds)
1155 * cmd->handle(x, y, z)
1156 * --jgrimm
1157 */
1158 while (NULL != (cmd = sctp_next_cmd(commands))) {
1159 switch (cmd->verb) {
1160 case SCTP_CMD_NOP:
1161 /* Do nothing. */
1162 break;
1163
1164 case SCTP_CMD_NEW_ASOC:
1165 /* Register a new association. */
1166 if (local_cork) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001167 sctp_outq_uncork(&asoc->outqueue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 local_cork = 0;
1169 }
1170 asoc = cmd->obj.ptr;
1171 /* Register with the endpoint. */
1172 sctp_endpoint_add_asoc(ep, asoc);
1173 sctp_hash_established(asoc);
1174 break;
1175
1176 case SCTP_CMD_UPDATE_ASSOC:
1177 sctp_assoc_update(asoc, cmd->obj.ptr);
1178 break;
1179
1180 case SCTP_CMD_PURGE_OUTQUEUE:
1181 sctp_outq_teardown(&asoc->outqueue);
1182 break;
1183
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001184 case SCTP_CMD_DELETE_TCB:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 if (local_cork) {
1186 sctp_outq_uncork(&asoc->outqueue);
1187 local_cork = 0;
1188 }
1189 /* Delete the current association. */
1190 sctp_cmd_delete_tcb(commands, asoc);
1191 asoc = NULL;
1192 break;
1193
1194 case SCTP_CMD_NEW_STATE:
1195 /* Enter a new state. */
1196 sctp_cmd_new_state(commands, asoc, cmd->obj.state);
1197 break;
1198
1199 case SCTP_CMD_REPORT_TSN:
1200 /* Record the arrival of a TSN. */
Vlad Yasevich8e1ee182008-10-08 14:18:39 -07001201 error = sctp_tsnmap_mark(&asoc->peer.tsn_map,
1202 cmd->obj.u32);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 break;
1204
1205 case SCTP_CMD_REPORT_FWDTSN:
1206 /* Move the Cumulattive TSN Ack ahead. */
1207 sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32);
1208
Vlad Yasevichea2dfb32007-07-13 17:01:19 -04001209 /* purge the fragmentation queue */
1210 sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32);
1211
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 /* Abort any in progress partial delivery. */
1213 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
1214 break;
1215
1216 case SCTP_CMD_PROCESS_FWDTSN:
1217 sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.ptr);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001218 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219
1220 case SCTP_CMD_GEN_SACK:
1221 /* Generate a Selective ACK.
1222 * The argument tells us whether to just count
1223 * the packet and MAYBE generate a SACK, or
1224 * force a SACK out.
1225 */
1226 force = cmd->obj.i32;
1227 error = sctp_gen_sack(asoc, force, commands);
1228 break;
1229
1230 case SCTP_CMD_PROCESS_SACK:
1231 /* Process an inbound SACK. */
1232 error = sctp_cmd_process_sack(commands, asoc,
1233 cmd->obj.ptr);
1234 break;
1235
1236 case SCTP_CMD_GEN_INIT_ACK:
1237 /* Generate an INIT ACK chunk. */
1238 new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC,
1239 0);
1240 if (!new_obj)
1241 goto nomem;
1242
1243 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1244 SCTP_CHUNK(new_obj));
1245 break;
1246
1247 case SCTP_CMD_PEER_INIT:
1248 /* Process a unified INIT from the peer.
1249 * Note: Only used during INIT-ACK processing. If
1250 * there is an error just return to the outter
1251 * layer which will bail.
1252 */
1253 error = sctp_cmd_process_init(commands, asoc, chunk,
1254 cmd->obj.ptr, gfp);
1255 break;
1256
1257 case SCTP_CMD_GEN_COOKIE_ECHO:
1258 /* Generate a COOKIE ECHO chunk. */
1259 new_obj = sctp_make_cookie_echo(asoc, chunk);
1260 if (!new_obj) {
1261 if (cmd->obj.ptr)
1262 sctp_chunk_free(cmd->obj.ptr);
1263 goto nomem;
1264 }
1265 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1266 SCTP_CHUNK(new_obj));
1267
1268 /* If there is an ERROR chunk to be sent along with
1269 * the COOKIE_ECHO, send it, too.
1270 */
1271 if (cmd->obj.ptr)
1272 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1273 SCTP_CHUNK(cmd->obj.ptr));
1274
Vlad Yasevich96cd0d32008-09-08 14:00:26 -04001275 if (new_obj->transport) {
1276 new_obj->transport->init_sent_count++;
1277 asoc->init_last_sent_to = new_obj->transport;
1278 }
1279
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280 /* FIXME - Eventually come up with a cleaner way to
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001281 * enabling COOKIE-ECHO + DATA bundling during
1282 * multihoming stale cookie scenarios, the following
1283 * command plays with asoc->peer.retran_path to
1284 * avoid the problem of sending the COOKIE-ECHO and
1285 * DATA in different paths, which could result
1286 * in the association being ABORTed if the DATA chunk
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 * is processed first by the server. Checking the
1288 * init error counter simply causes this command
1289 * to be executed only during failed attempts of
1290 * association establishment.
1291 */
Frank Filz3f7a87d2005-06-20 13:14:57 -07001292 if ((asoc->peer.retran_path !=
1293 asoc->peer.primary_path) &&
1294 (asoc->init_err_counter > 0)) {
1295 sctp_add_cmd_sf(commands,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001296 SCTP_CMD_FORCE_PRIM_RETRAN,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297 SCTP_NULL());
1298 }
1299
1300 break;
1301
1302 case SCTP_CMD_GEN_SHUTDOWN:
1303 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1304 * Reset error counts.
1305 */
1306 asoc->overall_error_count = 0;
1307
1308 /* Generate a SHUTDOWN chunk. */
1309 new_obj = sctp_make_shutdown(asoc, chunk);
1310 if (!new_obj)
1311 goto nomem;
1312 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1313 SCTP_CHUNK(new_obj));
1314 break;
1315
1316 case SCTP_CMD_CHUNK_ULP:
1317 /* Send a chunk to the sockets layer. */
1318 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1319 "chunk_up:", cmd->obj.ptr,
1320 "ulpq:", &asoc->ulpq);
1321 sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.ptr,
1322 GFP_ATOMIC);
1323 break;
1324
1325 case SCTP_CMD_EVENT_ULP:
1326 /* Send a notification to the sockets layer. */
1327 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1328 "event_up:",cmd->obj.ptr,
1329 "ulpq:",&asoc->ulpq);
1330 sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ptr);
1331 break;
1332
1333 case SCTP_CMD_REPLY:
1334 /* If an caller has not already corked, do cork. */
1335 if (!asoc->outqueue.cork) {
1336 sctp_outq_cork(&asoc->outqueue);
1337 local_cork = 1;
1338 }
1339 /* Send a chunk to our peer. */
1340 error = sctp_outq_tail(&asoc->outqueue, cmd->obj.ptr);
1341 break;
1342
1343 case SCTP_CMD_SEND_PKT:
1344 /* Send a full packet to our peer. */
1345 packet = cmd->obj.ptr;
1346 sctp_packet_transmit(packet);
1347 sctp_ootb_pkt_free(packet);
1348 break;
1349
Vlad Yasevichb6157d82007-10-24 15:59:16 -04001350 case SCTP_CMD_T1_RETRAN:
1351 /* Mark a transport for retransmission. */
1352 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1353 SCTP_RTXR_T1_RTX);
1354 break;
1355
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356 case SCTP_CMD_RETRAN:
1357 /* Mark a transport for retransmission. */
1358 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1359 SCTP_RTXR_T3_RTX);
1360 break;
1361
1362 case SCTP_CMD_TRANSMIT:
1363 /* Kick start transmission. */
1364 error = sctp_outq_uncork(&asoc->outqueue);
1365 local_cork = 0;
1366 break;
1367
1368 case SCTP_CMD_ECN_CE:
1369 /* Do delayed CE processing. */
1370 sctp_do_ecn_ce_work(asoc, cmd->obj.u32);
1371 break;
1372
1373 case SCTP_CMD_ECN_ECNE:
1374 /* Do delayed ECNE processing. */
1375 new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32,
1376 chunk);
1377 if (new_obj)
1378 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1379 SCTP_CHUNK(new_obj));
1380 break;
1381
1382 case SCTP_CMD_ECN_CWR:
1383 /* Do delayed CWR processing. */
1384 sctp_do_ecn_cwr_work(asoc, cmd->obj.u32);
1385 break;
1386
1387 case SCTP_CMD_SETUP_T2:
1388 sctp_cmd_setup_t2(commands, asoc, cmd->obj.ptr);
1389 break;
1390
1391 case SCTP_CMD_TIMER_START:
1392 timer = &asoc->timers[cmd->obj.to];
1393 timeout = asoc->timeouts[cmd->obj.to];
Kris Katterjohn09a62662006-01-08 22:24:28 -08001394 BUG_ON(!timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395
1396 timer->expires = jiffies + timeout;
1397 sctp_association_hold(asoc);
1398 add_timer(timer);
1399 break;
1400
1401 case SCTP_CMD_TIMER_RESTART:
1402 timer = &asoc->timers[cmd->obj.to];
1403 timeout = asoc->timeouts[cmd->obj.to];
1404 if (!mod_timer(timer, jiffies + timeout))
1405 sctp_association_hold(asoc);
1406 break;
1407
1408 case SCTP_CMD_TIMER_STOP:
1409 timer = &asoc->timers[cmd->obj.to];
1410 if (timer_pending(timer) && del_timer(timer))
1411 sctp_association_put(asoc);
1412 break;
1413
Frank Filz3f7a87d2005-06-20 13:14:57 -07001414 case SCTP_CMD_INIT_CHOOSE_TRANSPORT:
1415 chunk = cmd->obj.ptr;
Wei Yongjun9919b452009-05-12 21:52:51 +08001416 t = sctp_assoc_choose_alter_transport(asoc,
1417 asoc->init_last_sent_to);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001418 asoc->init_last_sent_to = t;
1419 chunk->transport = t;
1420 t->init_sent_count++;
1421 break;
1422
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 case SCTP_CMD_INIT_RESTART:
1424 /* Do the needed accounting and updates
1425 * associated with restarting an initialization
Frank Filz3f7a87d2005-06-20 13:14:57 -07001426 * timer. Only multiply the timeout by two if
1427 * all transports have been tried at the current
1428 * timeout.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 */
Vlad Yasevich96cd0d32008-09-08 14:00:26 -04001430 sctp_cmd_t1_timer_update(asoc,
1431 SCTP_EVENT_TIMEOUT_T1_INIT,
1432 "INIT");
Frank Filz3f7a87d2005-06-20 13:14:57 -07001433
1434 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
1435 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
1436 break;
1437
1438 case SCTP_CMD_COOKIEECHO_RESTART:
1439 /* Do the needed accounting and updates
1440 * associated with restarting an initialization
1441 * timer. Only multiply the timeout by two if
1442 * all transports have been tried at the current
1443 * timeout.
1444 */
Vlad Yasevich96cd0d32008-09-08 14:00:26 -04001445 sctp_cmd_t1_timer_update(asoc,
1446 SCTP_EVENT_TIMEOUT_T1_COOKIE,
1447 "COOKIE");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448
1449 /* If we've sent any data bundled with
1450 * COOKIE-ECHO we need to resend.
1451 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07001452 list_for_each_entry(t, &asoc->peer.transport_addr_list,
1453 transports) {
Vlad Yasevichb6157d82007-10-24 15:59:16 -04001454 sctp_retransmit_mark(&asoc->outqueue, t,
1455 SCTP_RTXR_T1_RTX);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456 }
1457
1458 sctp_add_cmd_sf(commands,
1459 SCTP_CMD_TIMER_RESTART,
Frank Filz3f7a87d2005-06-20 13:14:57 -07001460 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 break;
1462
1463 case SCTP_CMD_INIT_FAILED:
Al Virodc251b22006-11-20 17:00:44 -08001464 sctp_cmd_init_failed(commands, asoc, cmd->obj.err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465 break;
1466
1467 case SCTP_CMD_ASSOC_FAILED:
1468 sctp_cmd_assoc_failed(commands, asoc, event_type,
Al Viro5be291f2006-11-20 17:01:06 -08001469 subtype, chunk, cmd->obj.err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470 break;
1471
Frank Filz3f7a87d2005-06-20 13:14:57 -07001472 case SCTP_CMD_INIT_COUNTER_INC:
1473 asoc->init_err_counter++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474 break;
1475
Frank Filz3f7a87d2005-06-20 13:14:57 -07001476 case SCTP_CMD_INIT_COUNTER_RESET:
1477 asoc->init_err_counter = 0;
1478 asoc->init_cycle = 0;
Vlad Yasevich96cd0d32008-09-08 14:00:26 -04001479 list_for_each_entry(t, &asoc->peer.transport_addr_list,
1480 transports) {
1481 t->init_sent_count = 0;
1482 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 break;
1484
1485 case SCTP_CMD_REPORT_DUP:
1486 sctp_tsnmap_mark_dup(&asoc->peer.tsn_map,
1487 cmd->obj.u32);
1488 break;
1489
1490 case SCTP_CMD_REPORT_BAD_TAG:
1491 SCTP_DEBUG_PRINTK("vtag mismatch!\n");
1492 break;
1493
1494 case SCTP_CMD_STRIKE:
1495 /* Mark one strike against a transport. */
Vlad Yasevich7e990132009-03-02 09:46:14 +00001496 sctp_do_8_2_transport_strike(asoc, cmd->obj.transport,
1497 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 break;
1499
Vlad Yasevich7e990132009-03-02 09:46:14 +00001500 case SCTP_CMD_TRANSPORT_IDLE:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501 t = cmd->obj.transport;
Vlad Yasevich7e990132009-03-02 09:46:14 +00001502 sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE);
1503 break;
1504
1505 case SCTP_CMD_TRANSPORT_HB_SENT:
1506 t = cmd->obj.transport;
1507 sctp_do_8_2_transport_strike(asoc, t, 1);
1508 t->hb_sent = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509 break;
1510
1511 case SCTP_CMD_TRANSPORT_ON:
1512 t = cmd->obj.transport;
1513 sctp_cmd_transport_on(commands, asoc, t, chunk);
1514 break;
1515
1516 case SCTP_CMD_HB_TIMERS_START:
1517 sctp_cmd_hb_timers_start(commands, asoc);
1518 break;
1519
1520 case SCTP_CMD_HB_TIMER_UPDATE:
1521 t = cmd->obj.transport;
Gui Jianfeng765ff022008-04-12 18:55:12 -07001522 sctp_cmd_hb_timer_update(commands, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523 break;
1524
1525 case SCTP_CMD_HB_TIMERS_STOP:
1526 sctp_cmd_hb_timers_stop(commands, asoc);
1527 break;
1528
1529 case SCTP_CMD_REPORT_ERROR:
1530 error = cmd->obj.error;
1531 break;
1532
1533 case SCTP_CMD_PROCESS_CTSN:
1534 /* Dummy up a SACK for processing. */
Al Viro2178eda2006-11-20 17:26:53 -08001535 sackh.cum_tsn_ack = cmd->obj.be32;
Vlad Yasevichd4d6fb52009-09-04 18:20:59 -04001536 sackh.a_rwnd = asoc->peer.rwnd +
1537 asoc->outqueue.outstanding_bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538 sackh.num_gap_ack_blocks = 0;
1539 sackh.num_dup_tsns = 0;
1540 sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK,
1541 SCTP_SACKH(&sackh));
1542 break;
1543
1544 case SCTP_CMD_DISCARD_PACKET:
Vlad Yasevich2e3216c2008-06-19 16:08:18 -07001545 /* We need to discard the whole packet.
1546 * Uncork the queue since there might be
1547 * responses pending
1548 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 chunk->pdiscard = 1;
Vlad Yasevich2e3216c2008-06-19 16:08:18 -07001550 if (asoc) {
1551 sctp_outq_uncork(&asoc->outqueue);
1552 local_cork = 0;
1553 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 break;
1555
1556 case SCTP_CMD_RTO_PENDING:
1557 t = cmd->obj.transport;
1558 t->rto_pending = 1;
1559 break;
1560
1561 case SCTP_CMD_PART_DELIVER:
1562 sctp_ulpq_partial_delivery(&asoc->ulpq, cmd->obj.ptr,
1563 GFP_ATOMIC);
1564 break;
1565
1566 case SCTP_CMD_RENEGE:
1567 sctp_ulpq_renege(&asoc->ulpq, cmd->obj.ptr,
1568 GFP_ATOMIC);
1569 break;
1570
1571 case SCTP_CMD_SETUP_T4:
1572 sctp_cmd_setup_t4(commands, asoc, cmd->obj.ptr);
1573 break;
1574
1575 case SCTP_CMD_PROCESS_OPERR:
1576 sctp_cmd_process_operr(commands, asoc, chunk);
1577 break;
1578 case SCTP_CMD_CLEAR_INIT_TAG:
1579 asoc->peer.i.init_tag = 0;
1580 break;
1581 case SCTP_CMD_DEL_NON_PRIMARY:
1582 sctp_cmd_del_non_primary(asoc);
1583 break;
1584 case SCTP_CMD_T3_RTX_TIMERS_STOP:
1585 sctp_cmd_t3_rtx_timers_stop(commands, asoc);
1586 break;
1587 case SCTP_CMD_FORCE_PRIM_RETRAN:
1588 t = asoc->peer.retran_path;
1589 asoc->peer.retran_path = asoc->peer.primary_path;
1590 error = sctp_outq_uncork(&asoc->outqueue);
1591 local_cork = 0;
1592 asoc->peer.retran_path = t;
1593 break;
Sridhar Samudrala8de8c872006-05-19 10:58:12 -07001594 case SCTP_CMD_SET_SK_ERR:
1595 sctp_cmd_set_sk_err(asoc, cmd->obj.error);
1596 break;
Vlad Yasevich07d93962007-05-04 13:55:27 -07001597 case SCTP_CMD_ASSOC_CHANGE:
1598 sctp_cmd_assoc_change(commands, asoc,
1599 cmd->obj.u8);
1600 break;
1601 case SCTP_CMD_ADAPTATION_IND:
1602 sctp_cmd_adaptation_ind(commands, asoc);
1603 break;
1604
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07001605 case SCTP_CMD_ASSOC_SHKEY:
1606 error = sctp_auth_asoc_init_active_key(asoc,
1607 GFP_ATOMIC);
1608 break;
Gui Jianfengf4ad85c2008-04-12 18:39:34 -07001609 case SCTP_CMD_UPDATE_INITTAG:
1610 asoc->peer.i.init_tag = cmd->obj.u32;
1611 break;
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -04001612 case SCTP_CMD_SEND_MSG:
1613 if (!asoc->outqueue.cork) {
1614 sctp_outq_cork(&asoc->outqueue);
1615 local_cork = 1;
1616 }
1617 error = sctp_cmd_send_msg(asoc, cmd->obj.msg);
1618 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619 default:
1620 printk(KERN_WARNING "Impossible command: %u, %p\n",
1621 cmd->verb, cmd->obj.ptr);
1622 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001623 }
1624
Linus Torvalds1da177e2005-04-16 15:20:36 -07001625 if (error)
1626 break;
1627 }
1628
1629out:
Vlad Yasevich2e3216c2008-06-19 16:08:18 -07001630 /* If this is in response to a received chunk, wait until
1631 * we are done with the packet to open the queue so that we don't
1632 * send multiple packets in response to a single request.
1633 */
1634 if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) {
1635 if (chunk->end_of_packet || chunk->singleton)
Vlad Yasevichd4d6fb52009-09-04 18:20:59 -04001636 error = sctp_outq_uncork(&asoc->outqueue);
Vlad Yasevich2e3216c2008-06-19 16:08:18 -07001637 } else if (local_cork)
Vlad Yasevichd4d6fb52009-09-04 18:20:59 -04001638 error = sctp_outq_uncork(&asoc->outqueue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639 return error;
1640nomem:
1641 error = -ENOMEM;
1642 goto out;
1643}
1644