blob: 86426aac16009ec3e886efc2dd8fdd3f82f6a612 [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 */
Sridhar Samudralaad8fec12006-07-21 14:48:50 -0700443 /* When probing UNCONFIRMED addresses, the association overall
444 * error count is NOT incremented
445 */
446 if (transport->state != SCTP_UNCONFIRMED)
447 asoc->overall_error_count++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448
Frank Filz3f7a87d2005-06-20 13:14:57 -0700449 if (transport->state != SCTP_INACTIVE &&
Frank Filz52ccb8e2005-12-22 11:36:46 -0800450 (transport->error_count++ >= transport->pathmaxrxt)) {
Frank Filz3f7a87d2005-06-20 13:14:57 -0700451 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
452 " transport IP: port:%d failed.\n",
453 asoc,
Al Virob3f5b3b2006-11-20 17:22:43 -0800454 (&transport->ipaddr),
455 ntohs(transport->ipaddr.v4.sin_port));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 sctp_assoc_control_transport(asoc, transport,
457 SCTP_TRANSPORT_DOWN,
458 SCTP_FAILED_THRESHOLD);
459 }
460
461 /* E2) For the destination address for which the timer
462 * expires, set RTO <- RTO * 2 ("back off the timer"). The
463 * maximum value discussed in rule C7 above (RTO.max) may be
464 * used to provide an upper bound to this doubling operation.
Vlad Yasevichfaee47c2009-02-13 08:33:43 +0000465 *
466 * Special Case: the first HB doesn't trigger exponential backoff.
467 * The first unacknowleged HB triggers it. We do this with a flag
468 * that indicates that we have an outstanding HB.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 */
Vlad Yasevich7e990132009-03-02 09:46:14 +0000470 if (!is_hb || transport->hb_sent) {
Vlad Yasevichfaee47c2009-02-13 08:33:43 +0000471 transport->last_rto = transport->rto;
472 transport->rto = min((transport->rto * 2), transport->asoc->rto_max);
473 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474}
475
476/* Worker routine to handle INIT command failure. */
477static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands,
478 struct sctp_association *asoc,
479 unsigned error)
480{
481 struct sctp_ulpevent *event;
482
483 event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC,
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700484 (__u16)error, 0, 0, NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 GFP_ATOMIC);
486
487 if (event)
488 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
489 SCTP_ULPEVENT(event));
490
491 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
492 SCTP_STATE(SCTP_STATE_CLOSED));
493
494 /* SEND_FAILED sent later when cleaning up the association. */
495 asoc->outqueue.error = error;
496 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
497}
498
499/* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
500static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands,
501 struct sctp_association *asoc,
502 sctp_event_t event_type,
503 sctp_subtype_t subtype,
504 struct sctp_chunk *chunk,
505 unsigned error)
506{
507 struct sctp_ulpevent *event;
508
509 /* Cancel any partial delivery in progress. */
510 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
511
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700512 if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT)
513 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
514 (__u16)error, 0, 0, chunk,
515 GFP_ATOMIC);
516 else
517 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
518 (__u16)error, 0, 0, NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 GFP_ATOMIC);
520 if (event)
521 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
522 SCTP_ULPEVENT(event));
523
524 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
525 SCTP_STATE(SCTP_STATE_CLOSED));
526
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 /* SEND_FAILED sent later when cleaning up the association. */
528 asoc->outqueue.error = error;
529 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
530}
531
532/* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
533 * inside the cookie. In reality, this is only used for INIT-ACK processing
534 * since all other cases use "temporary" associations and can do all
535 * their work in statefuns directly.
536 */
537static int sctp_cmd_process_init(sctp_cmd_seq_t *commands,
538 struct sctp_association *asoc,
539 struct sctp_chunk *chunk,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -0700540 sctp_init_chunk_t *peer_init,
Al Virodd0fc662005-10-07 07:46:04 +0100541 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542{
543 int error;
544
545 /* We only process the init as a sideeffect in a single
546 * case. This is when we process the INIT-ACK. If we
547 * fail during INIT processing (due to malloc problems),
548 * just return the error and stop processing the stack.
549 */
550 if (!sctp_process_init(asoc, chunk->chunk_hdr->type,
551 sctp_source(chunk), peer_init, gfp))
552 error = -ENOMEM;
553 else
554 error = 0;
555
556 return error;
557}
558
559/* Helper function to break out starting up of heartbeat timers. */
560static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds,
561 struct sctp_association *asoc)
562{
563 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
565 /* Start a heartbeat timer for each transport on the association.
566 * hold a reference on the transport to make sure none of
567 * the needed data structures go away.
568 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700569 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
571 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
572 sctp_transport_hold(t);
573 }
574}
575
576static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds,
577 struct sctp_association *asoc)
578{
579 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
581 /* Stop all heartbeat timers. */
582
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700583 list_for_each_entry(t, &asoc->peer.transport_addr_list,
584 transports) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 if (del_timer(&t->hb_timer))
586 sctp_transport_put(t);
587 }
588}
589
590/* Helper function to stop any pending T3-RTX timers */
591static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900592 struct sctp_association *asoc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593{
594 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700596 list_for_each_entry(t, &asoc->peer.transport_addr_list,
597 transports) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 if (timer_pending(&t->T3_rtx_timer) &&
599 del_timer(&t->T3_rtx_timer)) {
600 sctp_transport_put(t);
601 }
602 }
603}
604
605
606/* Helper function to update the heartbeat timer. */
607static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 struct sctp_transport *t)
609{
610 /* Update the heartbeat timer. */
611 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
612 sctp_transport_hold(t);
613}
614
615/* Helper function to handle the reception of an HEARTBEAT ACK. */
616static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
617 struct sctp_association *asoc,
618 struct sctp_transport *t,
619 struct sctp_chunk *chunk)
620{
621 sctp_sender_hb_info_t *hbinfo;
622
623 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
624 * HEARTBEAT should clear the error counter of the destination
625 * transport address to which the HEARTBEAT was sent.
626 * The association's overall error count is also cleared.
627 */
628 t->error_count = 0;
629 t->asoc->overall_error_count = 0;
630
Vlad Yasevichfaee47c2009-02-13 08:33:43 +0000631 /* Clear the hb_sent flag to signal that we had a good
632 * acknowledgement.
633 */
634 t->hb_sent = 0;
635
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 /* Mark the destination transport address as active if it is not so
637 * marked.
638 */
Sridhar Samudralaad8fec12006-07-21 14:48:50 -0700639 if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
641 SCTP_HEARTBEAT_SUCCESS);
642
643 /* The receiver of the HEARTBEAT ACK should also perform an
644 * RTT measurement for that destination transport address
645 * using the time value carried in the HEARTBEAT ACK chunk.
Vlad Yaseviche533ca12007-01-30 14:36:14 -0800646 * If the transport's rto_pending variable has been cleared,
647 * it was most likely due to a retransmit. However, we want
648 * to re-enable it to properly update the rto.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 */
Vlad Yaseviche533ca12007-01-30 14:36:14 -0800650 if (t->rto_pending == 0)
651 t->rto_pending = 1;
652
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data;
654 sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at));
Sridhar Samudralaad8fec12006-07-21 14:48:50 -0700655
656 /* Update the heartbeat timer. */
657 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
658 sctp_transport_hold(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659}
660
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
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
Wei Yongjun9919b452009-05-12 21:52:51 +0800689 t = sctp_assoc_choose_alter_transport(asoc,
690 asoc->shutdown_last_sent_to);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 asoc->shutdown_last_sent_to = t;
692 asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto;
693 chunk->transport = t;
694}
695
696/* Helper function to change the state of an association. */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900697static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 struct sctp_association *asoc,
699 sctp_state_t state)
700{
701 struct sock *sk = asoc->base.sk;
702
703 asoc->state = state;
704
Frank Filz3f7a87d2005-06-20 13:14:57 -0700705 SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n",
706 asoc, sctp_state_tbl[state]);
707
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 if (sctp_style(sk, TCP)) {
Frank Filz3f7a87d2005-06-20 13:14:57 -0700709 /* Change the sk->sk_state of a TCP-style socket that has
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 * sucessfully completed a connect() call.
711 */
712 if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED))
713 sk->sk_state = SCTP_SS_ESTABLISHED;
714
715 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
716 if (sctp_state(asoc, SHUTDOWN_RECEIVED) &&
717 sctp_sstate(sk, ESTABLISHED))
718 sk->sk_shutdown |= RCV_SHUTDOWN;
719 }
720
Frank Filz3f7a87d2005-06-20 13:14:57 -0700721 if (sctp_state(asoc, COOKIE_WAIT)) {
722 /* Reset init timeouts since they may have been
723 * increased due to timer expirations.
724 */
725 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
Vladislav Yasevich1e7d3d92005-11-11 16:06:16 -0800726 asoc->rto_initial;
Frank Filz3f7a87d2005-06-20 13:14:57 -0700727 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
Vladislav Yasevich1e7d3d92005-11-11 16:06:16 -0800728 asoc->rto_initial;
Frank Filz3f7a87d2005-06-20 13:14:57 -0700729 }
730
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 if (sctp_state(asoc, ESTABLISHED) ||
732 sctp_state(asoc, CLOSED) ||
733 sctp_state(asoc, SHUTDOWN_RECEIVED)) {
734 /* Wake up any processes waiting in the asoc's wait queue in
735 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900736 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 if (waitqueue_active(&asoc->wait))
738 wake_up_interruptible(&asoc->wait);
739
740 /* Wake up any processes waiting in the sk's sleep queue of
741 * a TCP-style or UDP-style peeled-off socket in
742 * sctp_wait_for_accept() or sctp_wait_for_packet().
743 * For a UDP-style socket, the waiters are woken up by the
744 * notifications.
745 */
746 if (!sctp_style(sk, UDP))
747 sk->sk_state_change(sk);
748 }
749}
750
751/* Helper function to delete an association. */
752static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds,
753 struct sctp_association *asoc)
754{
755 struct sock *sk = asoc->base.sk;
756
757 /* If it is a non-temporary association belonging to a TCP-style
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900758 * listening socket that is not closed, do not free it so that accept()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 * can pick it up later.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900760 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) &&
762 (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK))
763 return;
764
765 sctp_unhash_established(asoc);
766 sctp_association_free(asoc);
767}
768
769/*
770 * ADDIP Section 4.1 ASCONF Chunk Procedures
771 * A4) Start a T-4 RTO timer, using the RTO value of the selected
772 * destination address (we use active path instead of primary path just
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900773 * because primary path may be inactive.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 */
775static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds,
776 struct sctp_association *asoc,
777 struct sctp_chunk *chunk)
778{
779 struct sctp_transport *t;
780
Wei Yongjun9919b452009-05-12 21:52:51 +0800781 t = sctp_assoc_choose_alter_transport(asoc, chunk->transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto;
783 chunk->transport = t;
784}
785
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900786/* Process an incoming Operation Error Chunk. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds,
788 struct sctp_association *asoc,
789 struct sctp_chunk *chunk)
790{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 struct sctp_errhdr *err_hdr;
Wei Yongjun3df26782009-03-02 06:46:51 +0000792 struct sctp_ulpevent *ev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793
Wei Yongjun3df26782009-03-02 06:46:51 +0000794 while (chunk->chunk_end > chunk->skb->data) {
795 err_hdr = (struct sctp_errhdr *)(chunk->skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796
Wei Yongjun3df26782009-03-02 06:46:51 +0000797 ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0,
798 GFP_ATOMIC);
799 if (!ev)
800 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801
Wei Yongjun3df26782009-03-02 06:46:51 +0000802 sctp_ulpq_tail_event(&asoc->ulpq, ev);
803
804 switch (err_hdr->cause) {
805 case SCTP_ERROR_UNKNOWN_CHUNK:
806 {
807 sctp_chunkhdr_t *unk_chunk_hdr;
808
809 unk_chunk_hdr = (sctp_chunkhdr_t *)err_hdr->variable;
810 switch (unk_chunk_hdr->type) {
811 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with
812 * an ERROR chunk reporting that it did not recognized
813 * the ASCONF chunk type, the sender of the ASCONF MUST
814 * NOT send any further ASCONF chunks and MUST stop its
815 * T-4 timer.
816 */
817 case SCTP_CID_ASCONF:
818 if (asoc->peer.asconf_capable == 0)
819 break;
820
821 asoc->peer.asconf_capable = 0;
822 sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO));
Wei Yongjun3df26782009-03-02 06:46:51 +0000824 break;
825 default:
826 break;
827 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 break;
Wei Yongjun3df26782009-03-02 06:46:51 +0000829 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 default:
831 break;
832 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 }
834}
835
836/* Process variable FWDTSN chunk information. */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900837static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 struct sctp_chunk *chunk)
839{
840 struct sctp_fwdtsn_skip *skip;
841 /* Walk through all the skipped SSNs */
842 sctp_walk_fwdtsn(skip, chunk) {
843 sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn));
844 }
845
846 return;
847}
848
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900849/* Helper function to remove the association non-primary peer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 * transports.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900851 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852static void sctp_cmd_del_non_primary(struct sctp_association *asoc)
853{
854 struct sctp_transport *t;
855 struct list_head *pos;
856 struct list_head *temp;
857
858 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
859 t = list_entry(pos, struct sctp_transport, transports);
Al Viro5f242a12006-11-20 17:05:23 -0800860 if (!sctp_cmp_addr_exact(&t->ipaddr,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900861 &asoc->peer.primary_addr)) {
Al Viro38a03142006-11-20 17:06:45 -0800862 sctp_assoc_del_peer(asoc, &t->ipaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 }
864 }
865
866 return;
867}
868
Sridhar Samudrala8de8c872006-05-19 10:58:12 -0700869/* Helper function to set sk_err on a 1-1 style socket. */
870static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error)
871{
872 struct sock *sk = asoc->base.sk;
873
874 if (!sctp_style(sk, UDP))
875 sk->sk_err = error;
876}
877
Vlad Yasevich07d93962007-05-04 13:55:27 -0700878/* Helper function to generate an association change event */
879static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands,
880 struct sctp_association *asoc,
881 u8 state)
882{
883 struct sctp_ulpevent *ev;
884
885 ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0,
886 asoc->c.sinit_num_ostreams,
887 asoc->c.sinit_max_instreams,
888 NULL, GFP_ATOMIC);
889 if (ev)
890 sctp_ulpq_tail_event(&asoc->ulpq, ev);
891}
892
893/* Helper function to generate an adaptation indication event */
894static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands,
895 struct sctp_association *asoc)
896{
897 struct sctp_ulpevent *ev;
898
899 ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC);
900
901 if (ev)
902 sctp_ulpq_tail_event(&asoc->ulpq, ev);
903}
904
Vlad Yasevich96cd0d32008-09-08 14:00:26 -0400905
906static void sctp_cmd_t1_timer_update(struct sctp_association *asoc,
907 sctp_event_timeout_t timer,
908 char *name)
909{
910 struct sctp_transport *t;
911
912 t = asoc->init_last_sent_to;
913 asoc->init_err_counter++;
914
915 if (t->init_sent_count > (asoc->init_cycle + 1)) {
916 asoc->timeouts[timer] *= 2;
917 if (asoc->timeouts[timer] > asoc->max_init_timeo) {
918 asoc->timeouts[timer] = asoc->max_init_timeo;
919 }
920 asoc->init_cycle++;
921 SCTP_DEBUG_PRINTK(
922 "T1 %s Timeout adjustment"
923 " init_err_counter: %d"
924 " cycle: %d"
925 " timeout: %ld\n",
926 name,
927 asoc->init_err_counter,
928 asoc->init_cycle,
929 asoc->timeouts[timer]);
930 }
931
932}
933
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934/* These three macros allow us to pull the debugging code out of the
935 * main flow of sctp_do_sm() to keep attention focused on the real
936 * functionality there.
937 */
938#define DEBUG_PRE \
939 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
940 "ep %p, %s, %s, asoc %p[%s], %s\n", \
941 ep, sctp_evttype_tbl[event_type], \
942 (*debug_fn)(subtype), asoc, \
943 sctp_state_tbl[state], state_fn->name)
944
945#define DEBUG_POST \
946 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
947 "asoc %p, status: %s\n", \
948 asoc, sctp_status_tbl[status])
949
950#define DEBUG_POST_SFX \
951 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
952 error, asoc, \
953 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
954 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
955
956/*
957 * This is the master state machine processing function.
958 *
959 * If you want to understand all of lksctp, this is a
960 * good place to start.
961 */
962int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype,
963 sctp_state_t state,
964 struct sctp_endpoint *ep,
965 struct sctp_association *asoc,
966 void *event_arg,
Al Virodd0fc662005-10-07 07:46:04 +0100967 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968{
969 sctp_cmd_seq_t commands;
970 const sctp_sm_table_entry_t *state_fn;
971 sctp_disposition_t status;
972 int error = 0;
973 typedef const char *(printfn_t)(sctp_subtype_t);
974
975 static printfn_t *table[] = {
976 NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname,
977 };
978 printfn_t *debug_fn __attribute__ ((unused)) = table[event_type];
979
980 /* Look up the state function, run it, and then process the
981 * side effects. These three steps are the heart of lksctp.
982 */
983 state_fn = sctp_sm_lookup_event(event_type, state, subtype);
984
985 sctp_init_cmd_seq(&commands);
986
987 DEBUG_PRE;
988 status = (*state_fn->fn)(ep, asoc, subtype, event_arg, &commands);
989 DEBUG_POST;
990
991 error = sctp_side_effects(event_type, subtype, state,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900992 ep, asoc, event_arg, status,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 &commands, gfp);
994 DEBUG_POST_SFX;
995
996 return error;
997}
998
999#undef DEBUG_PRE
1000#undef DEBUG_POST
1001
1002/*****************************************************************
1003 * This the master state function side effect processing function.
1004 *****************************************************************/
1005static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
1006 sctp_state_t state,
1007 struct sctp_endpoint *ep,
1008 struct sctp_association *asoc,
1009 void *event_arg,
1010 sctp_disposition_t status,
1011 sctp_cmd_seq_t *commands,
Al Virodd0fc662005-10-07 07:46:04 +01001012 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013{
1014 int error;
1015
1016 /* FIXME - Most of the dispositions left today would be categorized
1017 * as "exceptional" dispositions. For those dispositions, it
1018 * may not be proper to run through any of the commands at all.
1019 * For example, the command interpreter might be run only with
1020 * disposition SCTP_DISPOSITION_CONSUME.
1021 */
1022 if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state,
1023 ep, asoc,
1024 event_arg, status,
1025 commands, gfp)))
1026 goto bail;
1027
1028 switch (status) {
1029 case SCTP_DISPOSITION_DISCARD:
1030 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
1031 "event_type %d, event_id %d\n",
1032 state, event_type, subtype.chunk);
1033 break;
1034
1035 case SCTP_DISPOSITION_NOMEM:
1036 /* We ran out of memory, so we need to discard this
1037 * packet.
1038 */
1039 /* BUG--we should now recover some memory, probably by
1040 * reneging...
1041 */
1042 error = -ENOMEM;
1043 break;
1044
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001045 case SCTP_DISPOSITION_DELETE_TCB:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 /* This should now be a command. */
1047 break;
1048
1049 case SCTP_DISPOSITION_CONSUME:
1050 case SCTP_DISPOSITION_ABORT:
1051 /*
1052 * We should no longer have much work to do here as the
1053 * real work has been done as explicit commands above.
1054 */
1055 break;
1056
1057 case SCTP_DISPOSITION_VIOLATION:
Wei Yongjund99fa422007-08-27 11:19:24 +08001058 if (net_ratelimit())
1059 printk(KERN_ERR "sctp protocol violation state %d "
1060 "chunkid %d\n", state, subtype.chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 break;
1062
1063 case SCTP_DISPOSITION_NOT_IMPL:
1064 printk(KERN_WARNING "sctp unimplemented feature in state %d, "
1065 "event_type %d, event_id %d\n",
1066 state, event_type, subtype.chunk);
1067 break;
1068
1069 case SCTP_DISPOSITION_BUG:
1070 printk(KERN_ERR "sctp bug in state %d, "
1071 "event_type %d, event_id %d\n",
1072 state, event_type, subtype.chunk);
1073 BUG();
1074 break;
1075
1076 default:
1077 printk(KERN_ERR "sctp impossible disposition %d "
1078 "in state %d, event_type %d, event_id %d\n",
1079 status, state, event_type, subtype.chunk);
1080 BUG();
1081 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001082 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083
1084bail:
1085 return error;
1086}
1087
1088/********************************************************************
1089 * 2nd Level Abstractions
1090 ********************************************************************/
1091
1092/* This is the side-effect interpreter. */
1093static int sctp_cmd_interpreter(sctp_event_t event_type,
1094 sctp_subtype_t subtype,
1095 sctp_state_t state,
1096 struct sctp_endpoint *ep,
1097 struct sctp_association *asoc,
1098 void *event_arg,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001099 sctp_disposition_t status,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 sctp_cmd_seq_t *commands,
Al Virodd0fc662005-10-07 07:46:04 +01001101 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102{
1103 int error = 0;
1104 int force;
1105 sctp_cmd_t *cmd;
1106 struct sctp_chunk *new_obj;
1107 struct sctp_chunk *chunk = NULL;
1108 struct sctp_packet *packet;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 struct timer_list *timer;
1110 unsigned long timeout;
1111 struct sctp_transport *t;
1112 struct sctp_sackhdr sackh;
1113 int local_cork = 0;
1114
1115 if (SCTP_EVENT_T_TIMEOUT != event_type)
1116 chunk = (struct sctp_chunk *) event_arg;
1117
1118 /* Note: This whole file is a huge candidate for rework.
1119 * For example, each command could either have its own handler, so
1120 * the loop would look like:
1121 * while (cmds)
1122 * cmd->handle(x, y, z)
1123 * --jgrimm
1124 */
1125 while (NULL != (cmd = sctp_next_cmd(commands))) {
1126 switch (cmd->verb) {
1127 case SCTP_CMD_NOP:
1128 /* Do nothing. */
1129 break;
1130
1131 case SCTP_CMD_NEW_ASOC:
1132 /* Register a new association. */
1133 if (local_cork) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001134 sctp_outq_uncork(&asoc->outqueue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 local_cork = 0;
1136 }
1137 asoc = cmd->obj.ptr;
1138 /* Register with the endpoint. */
1139 sctp_endpoint_add_asoc(ep, asoc);
1140 sctp_hash_established(asoc);
1141 break;
1142
1143 case SCTP_CMD_UPDATE_ASSOC:
1144 sctp_assoc_update(asoc, cmd->obj.ptr);
1145 break;
1146
1147 case SCTP_CMD_PURGE_OUTQUEUE:
1148 sctp_outq_teardown(&asoc->outqueue);
1149 break;
1150
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001151 case SCTP_CMD_DELETE_TCB:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 if (local_cork) {
1153 sctp_outq_uncork(&asoc->outqueue);
1154 local_cork = 0;
1155 }
1156 /* Delete the current association. */
1157 sctp_cmd_delete_tcb(commands, asoc);
1158 asoc = NULL;
1159 break;
1160
1161 case SCTP_CMD_NEW_STATE:
1162 /* Enter a new state. */
1163 sctp_cmd_new_state(commands, asoc, cmd->obj.state);
1164 break;
1165
1166 case SCTP_CMD_REPORT_TSN:
1167 /* Record the arrival of a TSN. */
Vlad Yasevich8e1ee182008-10-08 14:18:39 -07001168 error = sctp_tsnmap_mark(&asoc->peer.tsn_map,
1169 cmd->obj.u32);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 break;
1171
1172 case SCTP_CMD_REPORT_FWDTSN:
1173 /* Move the Cumulattive TSN Ack ahead. */
1174 sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32);
1175
Vlad Yasevichea2dfb32007-07-13 17:01:19 -04001176 /* purge the fragmentation queue */
1177 sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32);
1178
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 /* Abort any in progress partial delivery. */
1180 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
1181 break;
1182
1183 case SCTP_CMD_PROCESS_FWDTSN:
1184 sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.ptr);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001185 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
1187 case SCTP_CMD_GEN_SACK:
1188 /* Generate a Selective ACK.
1189 * The argument tells us whether to just count
1190 * the packet and MAYBE generate a SACK, or
1191 * force a SACK out.
1192 */
1193 force = cmd->obj.i32;
1194 error = sctp_gen_sack(asoc, force, commands);
1195 break;
1196
1197 case SCTP_CMD_PROCESS_SACK:
1198 /* Process an inbound SACK. */
1199 error = sctp_cmd_process_sack(commands, asoc,
1200 cmd->obj.ptr);
1201 break;
1202
1203 case SCTP_CMD_GEN_INIT_ACK:
1204 /* Generate an INIT ACK chunk. */
1205 new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC,
1206 0);
1207 if (!new_obj)
1208 goto nomem;
1209
1210 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1211 SCTP_CHUNK(new_obj));
1212 break;
1213
1214 case SCTP_CMD_PEER_INIT:
1215 /* Process a unified INIT from the peer.
1216 * Note: Only used during INIT-ACK processing. If
1217 * there is an error just return to the outter
1218 * layer which will bail.
1219 */
1220 error = sctp_cmd_process_init(commands, asoc, chunk,
1221 cmd->obj.ptr, gfp);
1222 break;
1223
1224 case SCTP_CMD_GEN_COOKIE_ECHO:
1225 /* Generate a COOKIE ECHO chunk. */
1226 new_obj = sctp_make_cookie_echo(asoc, chunk);
1227 if (!new_obj) {
1228 if (cmd->obj.ptr)
1229 sctp_chunk_free(cmd->obj.ptr);
1230 goto nomem;
1231 }
1232 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1233 SCTP_CHUNK(new_obj));
1234
1235 /* If there is an ERROR chunk to be sent along with
1236 * the COOKIE_ECHO, send it, too.
1237 */
1238 if (cmd->obj.ptr)
1239 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1240 SCTP_CHUNK(cmd->obj.ptr));
1241
Vlad Yasevich96cd0d32008-09-08 14:00:26 -04001242 if (new_obj->transport) {
1243 new_obj->transport->init_sent_count++;
1244 asoc->init_last_sent_to = new_obj->transport;
1245 }
1246
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 /* FIXME - Eventually come up with a cleaner way to
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001248 * enabling COOKIE-ECHO + DATA bundling during
1249 * multihoming stale cookie scenarios, the following
1250 * command plays with asoc->peer.retran_path to
1251 * avoid the problem of sending the COOKIE-ECHO and
1252 * DATA in different paths, which could result
1253 * in the association being ABORTed if the DATA chunk
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 * is processed first by the server. Checking the
1255 * init error counter simply causes this command
1256 * to be executed only during failed attempts of
1257 * association establishment.
1258 */
Frank Filz3f7a87d2005-06-20 13:14:57 -07001259 if ((asoc->peer.retran_path !=
1260 asoc->peer.primary_path) &&
1261 (asoc->init_err_counter > 0)) {
1262 sctp_add_cmd_sf(commands,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001263 SCTP_CMD_FORCE_PRIM_RETRAN,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 SCTP_NULL());
1265 }
1266
1267 break;
1268
1269 case SCTP_CMD_GEN_SHUTDOWN:
1270 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1271 * Reset error counts.
1272 */
1273 asoc->overall_error_count = 0;
1274
1275 /* Generate a SHUTDOWN chunk. */
1276 new_obj = sctp_make_shutdown(asoc, chunk);
1277 if (!new_obj)
1278 goto nomem;
1279 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1280 SCTP_CHUNK(new_obj));
1281 break;
1282
1283 case SCTP_CMD_CHUNK_ULP:
1284 /* Send a chunk to the sockets layer. */
1285 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1286 "chunk_up:", cmd->obj.ptr,
1287 "ulpq:", &asoc->ulpq);
1288 sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.ptr,
1289 GFP_ATOMIC);
1290 break;
1291
1292 case SCTP_CMD_EVENT_ULP:
1293 /* Send a notification to the sockets layer. */
1294 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1295 "event_up:",cmd->obj.ptr,
1296 "ulpq:",&asoc->ulpq);
1297 sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ptr);
1298 break;
1299
1300 case SCTP_CMD_REPLY:
1301 /* If an caller has not already corked, do cork. */
1302 if (!asoc->outqueue.cork) {
1303 sctp_outq_cork(&asoc->outqueue);
1304 local_cork = 1;
1305 }
1306 /* Send a chunk to our peer. */
1307 error = sctp_outq_tail(&asoc->outqueue, cmd->obj.ptr);
1308 break;
1309
1310 case SCTP_CMD_SEND_PKT:
1311 /* Send a full packet to our peer. */
1312 packet = cmd->obj.ptr;
1313 sctp_packet_transmit(packet);
1314 sctp_ootb_pkt_free(packet);
1315 break;
1316
Vlad Yasevichb6157d82007-10-24 15:59:16 -04001317 case SCTP_CMD_T1_RETRAN:
1318 /* Mark a transport for retransmission. */
1319 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1320 SCTP_RTXR_T1_RTX);
1321 break;
1322
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 case SCTP_CMD_RETRAN:
1324 /* Mark a transport for retransmission. */
1325 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1326 SCTP_RTXR_T3_RTX);
1327 break;
1328
1329 case SCTP_CMD_TRANSMIT:
1330 /* Kick start transmission. */
1331 error = sctp_outq_uncork(&asoc->outqueue);
1332 local_cork = 0;
1333 break;
1334
1335 case SCTP_CMD_ECN_CE:
1336 /* Do delayed CE processing. */
1337 sctp_do_ecn_ce_work(asoc, cmd->obj.u32);
1338 break;
1339
1340 case SCTP_CMD_ECN_ECNE:
1341 /* Do delayed ECNE processing. */
1342 new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32,
1343 chunk);
1344 if (new_obj)
1345 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1346 SCTP_CHUNK(new_obj));
1347 break;
1348
1349 case SCTP_CMD_ECN_CWR:
1350 /* Do delayed CWR processing. */
1351 sctp_do_ecn_cwr_work(asoc, cmd->obj.u32);
1352 break;
1353
1354 case SCTP_CMD_SETUP_T2:
1355 sctp_cmd_setup_t2(commands, asoc, cmd->obj.ptr);
1356 break;
1357
1358 case SCTP_CMD_TIMER_START:
1359 timer = &asoc->timers[cmd->obj.to];
1360 timeout = asoc->timeouts[cmd->obj.to];
Kris Katterjohn09a62662006-01-08 22:24:28 -08001361 BUG_ON(!timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362
1363 timer->expires = jiffies + timeout;
1364 sctp_association_hold(asoc);
1365 add_timer(timer);
1366 break;
1367
1368 case SCTP_CMD_TIMER_RESTART:
1369 timer = &asoc->timers[cmd->obj.to];
1370 timeout = asoc->timeouts[cmd->obj.to];
1371 if (!mod_timer(timer, jiffies + timeout))
1372 sctp_association_hold(asoc);
1373 break;
1374
1375 case SCTP_CMD_TIMER_STOP:
1376 timer = &asoc->timers[cmd->obj.to];
1377 if (timer_pending(timer) && del_timer(timer))
1378 sctp_association_put(asoc);
1379 break;
1380
Frank Filz3f7a87d2005-06-20 13:14:57 -07001381 case SCTP_CMD_INIT_CHOOSE_TRANSPORT:
1382 chunk = cmd->obj.ptr;
Wei Yongjun9919b452009-05-12 21:52:51 +08001383 t = sctp_assoc_choose_alter_transport(asoc,
1384 asoc->init_last_sent_to);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001385 asoc->init_last_sent_to = t;
1386 chunk->transport = t;
1387 t->init_sent_count++;
1388 break;
1389
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 case SCTP_CMD_INIT_RESTART:
1391 /* Do the needed accounting and updates
1392 * associated with restarting an initialization
Frank Filz3f7a87d2005-06-20 13:14:57 -07001393 * timer. Only multiply the timeout by two if
1394 * all transports have been tried at the current
1395 * timeout.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 */
Vlad Yasevich96cd0d32008-09-08 14:00:26 -04001397 sctp_cmd_t1_timer_update(asoc,
1398 SCTP_EVENT_TIMEOUT_T1_INIT,
1399 "INIT");
Frank Filz3f7a87d2005-06-20 13:14:57 -07001400
1401 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
1402 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
1403 break;
1404
1405 case SCTP_CMD_COOKIEECHO_RESTART:
1406 /* Do the needed accounting and updates
1407 * associated with restarting an initialization
1408 * timer. Only multiply the timeout by two if
1409 * all transports have been tried at the current
1410 * timeout.
1411 */
Vlad Yasevich96cd0d32008-09-08 14:00:26 -04001412 sctp_cmd_t1_timer_update(asoc,
1413 SCTP_EVENT_TIMEOUT_T1_COOKIE,
1414 "COOKIE");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415
1416 /* If we've sent any data bundled with
1417 * COOKIE-ECHO we need to resend.
1418 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07001419 list_for_each_entry(t, &asoc->peer.transport_addr_list,
1420 transports) {
Vlad Yasevichb6157d82007-10-24 15:59:16 -04001421 sctp_retransmit_mark(&asoc->outqueue, t,
1422 SCTP_RTXR_T1_RTX);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 }
1424
1425 sctp_add_cmd_sf(commands,
1426 SCTP_CMD_TIMER_RESTART,
Frank Filz3f7a87d2005-06-20 13:14:57 -07001427 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 break;
1429
1430 case SCTP_CMD_INIT_FAILED:
Al Virodc251b22006-11-20 17:00:44 -08001431 sctp_cmd_init_failed(commands, asoc, cmd->obj.err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432 break;
1433
1434 case SCTP_CMD_ASSOC_FAILED:
1435 sctp_cmd_assoc_failed(commands, asoc, event_type,
Al Viro5be291f2006-11-20 17:01:06 -08001436 subtype, chunk, cmd->obj.err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 break;
1438
Frank Filz3f7a87d2005-06-20 13:14:57 -07001439 case SCTP_CMD_INIT_COUNTER_INC:
1440 asoc->init_err_counter++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441 break;
1442
Frank Filz3f7a87d2005-06-20 13:14:57 -07001443 case SCTP_CMD_INIT_COUNTER_RESET:
1444 asoc->init_err_counter = 0;
1445 asoc->init_cycle = 0;
Vlad Yasevich96cd0d32008-09-08 14:00:26 -04001446 list_for_each_entry(t, &asoc->peer.transport_addr_list,
1447 transports) {
1448 t->init_sent_count = 0;
1449 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450 break;
1451
1452 case SCTP_CMD_REPORT_DUP:
1453 sctp_tsnmap_mark_dup(&asoc->peer.tsn_map,
1454 cmd->obj.u32);
1455 break;
1456
1457 case SCTP_CMD_REPORT_BAD_TAG:
1458 SCTP_DEBUG_PRINTK("vtag mismatch!\n");
1459 break;
1460
1461 case SCTP_CMD_STRIKE:
1462 /* Mark one strike against a transport. */
Vlad Yasevich7e990132009-03-02 09:46:14 +00001463 sctp_do_8_2_transport_strike(asoc, cmd->obj.transport,
1464 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465 break;
1466
Vlad Yasevich7e990132009-03-02 09:46:14 +00001467 case SCTP_CMD_TRANSPORT_IDLE:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 t = cmd->obj.transport;
Vlad Yasevich7e990132009-03-02 09:46:14 +00001469 sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE);
1470 break;
1471
1472 case SCTP_CMD_TRANSPORT_HB_SENT:
1473 t = cmd->obj.transport;
1474 sctp_do_8_2_transport_strike(asoc, t, 1);
1475 t->hb_sent = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476 break;
1477
1478 case SCTP_CMD_TRANSPORT_ON:
1479 t = cmd->obj.transport;
1480 sctp_cmd_transport_on(commands, asoc, t, chunk);
1481 break;
1482
1483 case SCTP_CMD_HB_TIMERS_START:
1484 sctp_cmd_hb_timers_start(commands, asoc);
1485 break;
1486
1487 case SCTP_CMD_HB_TIMER_UPDATE:
1488 t = cmd->obj.transport;
Gui Jianfeng765ff022008-04-12 18:55:12 -07001489 sctp_cmd_hb_timer_update(commands, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 break;
1491
1492 case SCTP_CMD_HB_TIMERS_STOP:
1493 sctp_cmd_hb_timers_stop(commands, asoc);
1494 break;
1495
1496 case SCTP_CMD_REPORT_ERROR:
1497 error = cmd->obj.error;
1498 break;
1499
1500 case SCTP_CMD_PROCESS_CTSN:
1501 /* Dummy up a SACK for processing. */
Al Viro2178eda2006-11-20 17:26:53 -08001502 sackh.cum_tsn_ack = cmd->obj.be32;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503 sackh.a_rwnd = 0;
1504 sackh.num_gap_ack_blocks = 0;
1505 sackh.num_dup_tsns = 0;
1506 sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK,
1507 SCTP_SACKH(&sackh));
1508 break;
1509
1510 case SCTP_CMD_DISCARD_PACKET:
Vlad Yasevich2e3216c2008-06-19 16:08:18 -07001511 /* We need to discard the whole packet.
1512 * Uncork the queue since there might be
1513 * responses pending
1514 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515 chunk->pdiscard = 1;
Vlad Yasevich2e3216c2008-06-19 16:08:18 -07001516 if (asoc) {
1517 sctp_outq_uncork(&asoc->outqueue);
1518 local_cork = 0;
1519 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520 break;
1521
1522 case SCTP_CMD_RTO_PENDING:
1523 t = cmd->obj.transport;
1524 t->rto_pending = 1;
1525 break;
1526
1527 case SCTP_CMD_PART_DELIVER:
1528 sctp_ulpq_partial_delivery(&asoc->ulpq, cmd->obj.ptr,
1529 GFP_ATOMIC);
1530 break;
1531
1532 case SCTP_CMD_RENEGE:
1533 sctp_ulpq_renege(&asoc->ulpq, cmd->obj.ptr,
1534 GFP_ATOMIC);
1535 break;
1536
1537 case SCTP_CMD_SETUP_T4:
1538 sctp_cmd_setup_t4(commands, asoc, cmd->obj.ptr);
1539 break;
1540
1541 case SCTP_CMD_PROCESS_OPERR:
1542 sctp_cmd_process_operr(commands, asoc, chunk);
1543 break;
1544 case SCTP_CMD_CLEAR_INIT_TAG:
1545 asoc->peer.i.init_tag = 0;
1546 break;
1547 case SCTP_CMD_DEL_NON_PRIMARY:
1548 sctp_cmd_del_non_primary(asoc);
1549 break;
1550 case SCTP_CMD_T3_RTX_TIMERS_STOP:
1551 sctp_cmd_t3_rtx_timers_stop(commands, asoc);
1552 break;
1553 case SCTP_CMD_FORCE_PRIM_RETRAN:
1554 t = asoc->peer.retran_path;
1555 asoc->peer.retran_path = asoc->peer.primary_path;
1556 error = sctp_outq_uncork(&asoc->outqueue);
1557 local_cork = 0;
1558 asoc->peer.retran_path = t;
1559 break;
Sridhar Samudrala8de8c872006-05-19 10:58:12 -07001560 case SCTP_CMD_SET_SK_ERR:
1561 sctp_cmd_set_sk_err(asoc, cmd->obj.error);
1562 break;
Vlad Yasevich07d93962007-05-04 13:55:27 -07001563 case SCTP_CMD_ASSOC_CHANGE:
1564 sctp_cmd_assoc_change(commands, asoc,
1565 cmd->obj.u8);
1566 break;
1567 case SCTP_CMD_ADAPTATION_IND:
1568 sctp_cmd_adaptation_ind(commands, asoc);
1569 break;
1570
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07001571 case SCTP_CMD_ASSOC_SHKEY:
1572 error = sctp_auth_asoc_init_active_key(asoc,
1573 GFP_ATOMIC);
1574 break;
Gui Jianfengf4ad85c2008-04-12 18:39:34 -07001575 case SCTP_CMD_UPDATE_INITTAG:
1576 asoc->peer.i.init_tag = cmd->obj.u32;
1577 break;
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07001578
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579 default:
1580 printk(KERN_WARNING "Impossible command: %u, %p\n",
1581 cmd->verb, cmd->obj.ptr);
1582 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001583 }
1584
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585 if (error)
1586 break;
1587 }
1588
1589out:
Vlad Yasevich2e3216c2008-06-19 16:08:18 -07001590 /* If this is in response to a received chunk, wait until
1591 * we are done with the packet to open the queue so that we don't
1592 * send multiple packets in response to a single request.
1593 */
1594 if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) {
1595 if (chunk->end_of_packet || chunk->singleton)
1596 sctp_outq_uncork(&asoc->outqueue);
1597 } else if (local_cork)
1598 sctp_outq_uncork(&asoc->outqueue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599 return error;
1600nomem:
1601 error = -ENOMEM;
1602 goto out;
1603}
1604