blob: 6773d7803627ff15f9a5d2c144203d17226d9622 [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
Joe Perches145ce502010-08-24 13:21:08 +000050#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <linux/skbuff.h>
53#include <linux/types.h>
54#include <linux/socket.h>
55#include <linux/ip.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090056#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070057#include <net/sock.h>
58#include <net/sctp/sctp.h>
59#include <net/sctp/sm.h>
60
61static int sctp_cmd_interpreter(sctp_event_t event_type,
62 sctp_subtype_t subtype,
63 sctp_state_t state,
64 struct sctp_endpoint *ep,
65 struct sctp_association *asoc,
66 void *event_arg,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +090067 sctp_disposition_t status,
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 sctp_cmd_seq_t *commands,
Al Virodd0fc662005-10-07 07:46:04 +010069 gfp_t gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
71 sctp_state_t state,
72 struct sctp_endpoint *ep,
73 struct sctp_association *asoc,
74 void *event_arg,
75 sctp_disposition_t status,
76 sctp_cmd_seq_t *commands,
Al Virodd0fc662005-10-07 07:46:04 +010077 gfp_t gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Neil Horman5aa93bc2012-07-21 07:56:07 +000079static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds,
80 struct sctp_transport *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081/********************************************************************
82 * Helper functions
83 ********************************************************************/
84
85/* A helper function for delayed processing of INET ECN CE bit. */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +090086static void sctp_do_ecn_ce_work(struct sctp_association *asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 __u32 lowest_tsn)
88{
89 /* Save the TSN away for comparison when we receive CWR */
90
91 asoc->last_ecne_tsn = lowest_tsn;
92 asoc->need_ecne = 1;
93}
94
95/* Helper function for delayed processing of SCTP ECNE chunk. */
96/* RFC 2960 Appendix A
97 *
98 * RFC 2481 details a specific bit for a sender to send in
99 * the header of its next outbound TCP segment to indicate to
100 * its peer that it has reduced its congestion window. This
101 * is termed the CWR bit. For SCTP the same indication is made
102 * by including the CWR chunk. This chunk contains one data
103 * element, i.e. the TSN number that was sent in the ECNE chunk.
104 * This element represents the lowest TSN number in the datagram
105 * that was originally marked with the CE bit.
106 */
107static struct sctp_chunk *sctp_do_ecn_ecne_work(struct sctp_association *asoc,
108 __u32 lowest_tsn,
109 struct sctp_chunk *chunk)
110{
111 struct sctp_chunk *repl;
112
113 /* Our previously transmitted packet ran into some congestion
114 * so we should take action by reducing cwnd and ssthresh
115 * and then ACK our peer that we we've done so by
116 * sending a CWR.
117 */
118
119 /* First, try to determine if we want to actually lower
120 * our cwnd variables. Only lower them if the ECNE looks more
121 * recent than the last response.
122 */
123 if (TSN_lt(asoc->last_cwr_tsn, lowest_tsn)) {
124 struct sctp_transport *transport;
125
126 /* Find which transport's congestion variables
127 * need to be adjusted.
128 */
129 transport = sctp_assoc_lookup_tsn(asoc, lowest_tsn);
130
131 /* Update the congestion variables. */
132 if (transport)
133 sctp_transport_lower_cwnd(transport,
134 SCTP_LOWER_CWND_ECNE);
135 asoc->last_cwr_tsn = lowest_tsn;
136 }
137
138 /* Always try to quiet the other end. In case of lost CWR,
139 * resend last_cwr_tsn.
140 */
141 repl = sctp_make_cwr(asoc, asoc->last_cwr_tsn, chunk);
142
143 /* If we run out of memory, it will look like a lost CWR. We'll
144 * get back in sync eventually.
145 */
146 return repl;
147}
148
149/* Helper function to do delayed processing of ECN CWR chunk. */
150static void sctp_do_ecn_cwr_work(struct sctp_association *asoc,
151 __u32 lowest_tsn)
152{
153 /* Turn off ECNE getting auto-prepended to every outgoing
154 * packet
155 */
156 asoc->need_ecne = 0;
157}
158
159/* Generate SACK if necessary. We call this at the end of a packet. */
160static int sctp_gen_sack(struct sctp_association *asoc, int force,
161 sctp_cmd_seq_t *commands)
162{
163 __u32 ctsn, max_tsn_seen;
164 struct sctp_chunk *sack;
Frank Filz52ccb8e2005-12-22 11:36:46 -0800165 struct sctp_transport *trans = asoc->peer.last_data_from;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 int error = 0;
167
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900168 if (force ||
Frank Filz52ccb8e2005-12-22 11:36:46 -0800169 (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) ||
170 (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 asoc->peer.sack_needed = 1;
172
173 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
174 max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
175
176 /* From 12.2 Parameters necessary per association (i.e. the TCB):
177 *
178 * Ack State : This flag indicates if the next received packet
179 * : is to be responded to with a SACK. ...
180 * : When DATA chunks are out of order, SACK's
181 * : are not delayed (see Section 6).
182 *
183 * [This is actually not mentioned in Section 6, but we
184 * implement it here anyway. --piggy]
185 */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900186 if (max_tsn_seen != ctsn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 asoc->peer.sack_needed = 1;
188
189 /* From 6.2 Acknowledgement on Reception of DATA Chunks:
190 *
191 * Section 4.2 of [RFC2581] SHOULD be followed. Specifically,
192 * an acknowledgement SHOULD be generated for at least every
193 * second packet (not every second DATA chunk) received, and
194 * SHOULD be generated within 200 ms of the arrival of any
195 * unacknowledged DATA chunk. ...
196 */
197 if (!asoc->peer.sack_needed) {
Wei Yongjund364d922008-05-09 15:13:26 -0700198 asoc->peer.sack_cnt++;
Frank Filz52ccb8e2005-12-22 11:36:46 -0800199
200 /* Set the SACK delay timeout based on the
201 * SACK delay for the last transport
202 * data was received from, or the default
203 * for the association.
204 */
Wei Yongjund364d922008-05-09 15:13:26 -0700205 if (trans) {
206 /* We will need a SACK for the next packet. */
207 if (asoc->peer.sack_cnt >= trans->sackfreq - 1)
208 asoc->peer.sack_needed = 1;
209
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900210 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
Frank Filz52ccb8e2005-12-22 11:36:46 -0800211 trans->sackdelay;
Wei Yongjund364d922008-05-09 15:13:26 -0700212 } else {
213 /* We will need a SACK for the next packet. */
214 if (asoc->peer.sack_cnt >= asoc->sackfreq - 1)
215 asoc->peer.sack_needed = 1;
216
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900217 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
Frank Filz52ccb8e2005-12-22 11:36:46 -0800218 asoc->sackdelay;
Wei Yongjund364d922008-05-09 15:13:26 -0700219 }
Frank Filz52ccb8e2005-12-22 11:36:46 -0800220
221 /* Restart the SACK timer. */
222 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
223 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 } else {
Vlad Yasevich90f2f532009-11-23 15:53:57 -0500225 asoc->a_rwnd = asoc->rwnd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 sack = sctp_make_sack(asoc);
227 if (!sack)
228 goto nomem;
229
230 asoc->peer.sack_needed = 0;
Wei Yongjund364d922008-05-09 15:13:26 -0700231 asoc->peer.sack_cnt = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
Vlad Yasevich732ba352007-01-15 19:20:21 -0800233 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
235 /* Stop the SACK timer. */
236 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
237 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
238 }
Frank Filz52ccb8e2005-12-22 11:36:46 -0800239
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 return error;
241nomem:
242 error = -ENOMEM;
243 return error;
244}
245
246/* When the T3-RTX timer expires, it calls this function to create the
247 * relevant state machine event.
248 */
249void sctp_generate_t3_rtx_event(unsigned long peer)
250{
251 int error;
252 struct sctp_transport *transport = (struct sctp_transport *) peer;
253 struct sctp_association *asoc = transport->asoc;
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000254 struct net *net = sock_net(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
256 /* Check whether a task is in the sock. */
257
258 sctp_bh_lock_sock(asoc->base.sk);
259 if (sock_owned_by_user(asoc->base.sk)) {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800260 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
262 /* Try again later. */
263 if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20)))
264 sctp_transport_hold(transport);
265 goto out_unlock;
266 }
267
268 /* Is this transport really dead and just waiting around for
269 * the timer to let go of the reference?
270 */
271 if (transport->dead)
272 goto out_unlock;
273
274 /* Run through the state machine. */
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000275 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX),
277 asoc->state,
278 asoc->ep, asoc,
279 transport, GFP_ATOMIC);
280
281 if (error)
282 asoc->base.sk->sk_err = -error;
283
284out_unlock:
285 sctp_bh_unlock_sock(asoc->base.sk);
286 sctp_transport_put(transport);
287}
288
289/* This is a sa interface for producing timeout events. It works
290 * for timeouts which use the association as their parameter.
291 */
292static void sctp_generate_timeout_event(struct sctp_association *asoc,
293 sctp_event_timeout_t timeout_type)
294{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000295 struct net *net = sock_net(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 int error = 0;
297
298 sctp_bh_lock_sock(asoc->base.sk);
299 if (sock_owned_by_user(asoc->base.sk)) {
300 SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800301 __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 timeout_type);
303
304 /* Try again later. */
305 if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20)))
306 sctp_association_hold(asoc);
307 goto out_unlock;
308 }
309
310 /* Is this association really dead and just waiting around for
311 * the timer to let go of the reference?
312 */
313 if (asoc->base.dead)
314 goto out_unlock;
315
316 /* Run through the state machine. */
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000317 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 SCTP_ST_TIMEOUT(timeout_type),
319 asoc->state, asoc->ep, asoc,
320 (void *)timeout_type, GFP_ATOMIC);
321
322 if (error)
323 asoc->base.sk->sk_err = -error;
324
325out_unlock:
326 sctp_bh_unlock_sock(asoc->base.sk);
327 sctp_association_put(asoc);
328}
329
330static void sctp_generate_t1_cookie_event(unsigned long data)
331{
332 struct sctp_association *asoc = (struct sctp_association *) data;
333 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE);
334}
335
336static void sctp_generate_t1_init_event(unsigned long data)
337{
338 struct sctp_association *asoc = (struct sctp_association *) data;
339 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT);
340}
341
342static void sctp_generate_t2_shutdown_event(unsigned long data)
343{
344 struct sctp_association *asoc = (struct sctp_association *) data;
345 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN);
346}
347
348static void sctp_generate_t4_rto_event(unsigned long data)
349{
350 struct sctp_association *asoc = (struct sctp_association *) data;
351 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO);
352}
353
354static void sctp_generate_t5_shutdown_guard_event(unsigned long data)
355{
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900356 struct sctp_association *asoc = (struct sctp_association *)data;
357 sctp_generate_timeout_event(asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD);
359
360} /* sctp_generate_t5_shutdown_guard_event() */
361
362static void sctp_generate_autoclose_event(unsigned long data)
363{
364 struct sctp_association *asoc = (struct sctp_association *) data;
365 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE);
366}
367
368/* Generate a heart beat event. If the sock is busy, reschedule. Make
369 * sure that the transport is still valid.
370 */
371void sctp_generate_heartbeat_event(unsigned long data)
372{
373 int error = 0;
374 struct sctp_transport *transport = (struct sctp_transport *) data;
375 struct sctp_association *asoc = transport->asoc;
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000376 struct net *net = sock_net(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
378 sctp_bh_lock_sock(asoc->base.sk);
379 if (sock_owned_by_user(asoc->base.sk)) {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800380 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
382 /* Try again later. */
383 if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20)))
384 sctp_transport_hold(transport);
385 goto out_unlock;
386 }
387
388 /* Is this structure just waiting around for us to actually
389 * get destroyed?
390 */
391 if (transport->dead)
392 goto out_unlock;
393
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000394 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT),
396 asoc->state, asoc->ep, asoc,
397 transport, GFP_ATOMIC);
398
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900399 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 asoc->base.sk->sk_err = -error;
401
402out_unlock:
403 sctp_bh_unlock_sock(asoc->base.sk);
404 sctp_transport_put(transport);
405}
406
Vlad Yasevich50b5d6a2010-05-06 00:56:07 -0700407/* Handle the timeout of the ICMP protocol unreachable timer. Trigger
408 * the correct state machine transition that will close the association.
409 */
410void sctp_generate_proto_unreach_event(unsigned long data)
411{
412 struct sctp_transport *transport = (struct sctp_transport *) data;
413 struct sctp_association *asoc = transport->asoc;
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000414 struct net *net = sock_net(asoc->base.sk);
Vlad Yasevich50b5d6a2010-05-06 00:56:07 -0700415
416 sctp_bh_lock_sock(asoc->base.sk);
417 if (sock_owned_by_user(asoc->base.sk)) {
418 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__);
419
420 /* Try again later. */
421 if (!mod_timer(&transport->proto_unreach_timer,
422 jiffies + (HZ/20)))
423 sctp_association_hold(asoc);
424 goto out_unlock;
425 }
426
427 /* Is this structure just waiting around for us to actually
428 * get destroyed?
429 */
430 if (asoc->base.dead)
431 goto out_unlock;
432
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000433 sctp_do_sm(net, SCTP_EVENT_T_OTHER,
Vlad Yasevich50b5d6a2010-05-06 00:56:07 -0700434 SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH),
435 asoc->state, asoc->ep, asoc, transport, GFP_ATOMIC);
436
437out_unlock:
438 sctp_bh_unlock_sock(asoc->base.sk);
439 sctp_association_put(asoc);
440}
441
442
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443/* Inject a SACK Timeout event into the state machine. */
444static void sctp_generate_sack_event(unsigned long data)
445{
446 struct sctp_association *asoc = (struct sctp_association *) data;
447 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK);
448}
449
450sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = {
451 NULL,
452 sctp_generate_t1_cookie_event,
453 sctp_generate_t1_init_event,
454 sctp_generate_t2_shutdown_event,
455 NULL,
456 sctp_generate_t4_rto_event,
457 sctp_generate_t5_shutdown_guard_event,
Vladislav Yasevich1e7d3d92005-11-11 16:06:16 -0800458 NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 sctp_generate_sack_event,
460 sctp_generate_autoclose_event,
461};
462
463
464/* RFC 2960 8.2 Path Failure Detection
465 *
466 * When its peer endpoint is multi-homed, an endpoint should keep a
467 * error counter for each of the destination transport addresses of the
468 * peer endpoint.
469 *
470 * Each time the T3-rtx timer expires on any address, or when a
471 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
472 * the error counter of that destination address will be incremented.
473 * When the value in the error counter exceeds the protocol parameter
474 * 'Path.Max.Retrans' of that destination address, the endpoint should
475 * mark the destination transport address as inactive, and a
476 * notification SHOULD be sent to the upper layer.
477 *
478 */
Neil Horman5aa93bc2012-07-21 07:56:07 +0000479static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t *commands,
480 struct sctp_association *asoc,
Vlad Yasevich7e990132009-03-02 09:46:14 +0000481 struct sctp_transport *transport,
482 int is_hb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483{
484 /* The check for association's overall error counter exceeding the
485 * threshold is done in the state function.
486 */
Vlad Yasevichb9f84782009-08-26 09:36:25 -0400487 /* We are here due to a timer expiration. If the timer was
488 * not a HEARTBEAT, then normal error tracking is done.
489 * If the timer was a heartbeat, we only increment error counts
490 * when we already have an outstanding HEARTBEAT that has not
491 * been acknowledged.
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300492 * Additionally, some tranport states inhibit error increments.
Sridhar Samudralaad8fec12006-07-21 14:48:50 -0700493 */
Vlad Yasevichb9f84782009-08-26 09:36:25 -0400494 if (!is_hb) {
Sridhar Samudralaad8fec12006-07-21 14:48:50 -0700495 asoc->overall_error_count++;
Vlad Yasevichb9f84782009-08-26 09:36:25 -0400496 if (transport->state != SCTP_INACTIVE)
497 transport->error_count++;
498 } else if (transport->hb_sent) {
499 if (transport->state != SCTP_UNCONFIRMED)
500 asoc->overall_error_count++;
501 if (transport->state != SCTP_INACTIVE)
502 transport->error_count++;
503 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
Neil Horman5aa93bc2012-07-21 07:56:07 +0000505 /* If the transport error count is greater than the pf_retrans
506 * threshold, and less than pathmaxrtx, then mark this transport
507 * as Partially Failed, ee SCTP Quick Failover Draft, secon 5.1,
508 * point 1
509 */
510 if ((transport->state != SCTP_PF) &&
511 (asoc->pf_retrans < transport->pathmaxrxt) &&
512 (transport->error_count > asoc->pf_retrans)) {
513
514 sctp_assoc_control_transport(asoc, transport,
515 SCTP_TRANSPORT_PF,
516 0);
517
518 /* Update the hb timer to resend a heartbeat every rto */
519 sctp_cmd_hb_timer_update(commands, transport);
520 }
521
Frank Filz3f7a87d2005-06-20 13:14:57 -0700522 if (transport->state != SCTP_INACTIVE &&
Vlad Yasevichb9f84782009-08-26 09:36:25 -0400523 (transport->error_count > transport->pathmaxrxt)) {
Frank Filz3f7a87d2005-06-20 13:14:57 -0700524 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
525 " transport IP: port:%d failed.\n",
526 asoc,
Al Virob3f5b3b2006-11-20 17:22:43 -0800527 (&transport->ipaddr),
528 ntohs(transport->ipaddr.v4.sin_port));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 sctp_assoc_control_transport(asoc, transport,
530 SCTP_TRANSPORT_DOWN,
531 SCTP_FAILED_THRESHOLD);
532 }
533
534 /* E2) For the destination address for which the timer
535 * expires, set RTO <- RTO * 2 ("back off the timer"). The
536 * maximum value discussed in rule C7 above (RTO.max) may be
537 * used to provide an upper bound to this doubling operation.
Vlad Yasevichfaee47c2009-02-13 08:33:43 +0000538 *
539 * Special Case: the first HB doesn't trigger exponential backoff.
Daniel Mack3ad2f3f2010-02-03 08:01:28 +0800540 * The first unacknowledged HB triggers it. We do this with a flag
Vlad Yasevichfaee47c2009-02-13 08:33:43 +0000541 * that indicates that we have an outstanding HB.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 */
Vlad Yasevich7e990132009-03-02 09:46:14 +0000543 if (!is_hb || transport->hb_sent) {
Vlad Yasevichfaee47c2009-02-13 08:33:43 +0000544 transport->rto = min((transport->rto * 2), transport->asoc->rto_max);
545 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546}
547
548/* Worker routine to handle INIT command failure. */
549static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands,
550 struct sctp_association *asoc,
Eric Dumazet95c96172012-04-15 05:58:06 +0000551 unsigned int error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552{
553 struct sctp_ulpevent *event;
554
555 event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC,
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700556 (__u16)error, 0, 0, NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 GFP_ATOMIC);
558
559 if (event)
560 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
561 SCTP_ULPEVENT(event));
562
563 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
564 SCTP_STATE(SCTP_STATE_CLOSED));
565
566 /* SEND_FAILED sent later when cleaning up the association. */
567 asoc->outqueue.error = error;
568 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
569}
570
571/* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
572static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands,
573 struct sctp_association *asoc,
574 sctp_event_t event_type,
575 sctp_subtype_t subtype,
576 struct sctp_chunk *chunk,
Eric Dumazet95c96172012-04-15 05:58:06 +0000577 unsigned int error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578{
579 struct sctp_ulpevent *event;
580
581 /* Cancel any partial delivery in progress. */
582 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
583
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700584 if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT)
585 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
586 (__u16)error, 0, 0, chunk,
587 GFP_ATOMIC);
588 else
589 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
590 (__u16)error, 0, 0, NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 GFP_ATOMIC);
592 if (event)
593 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
594 SCTP_ULPEVENT(event));
595
596 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
597 SCTP_STATE(SCTP_STATE_CLOSED));
598
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 /* SEND_FAILED sent later when cleaning up the association. */
600 asoc->outqueue.error = error;
601 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
602}
603
604/* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
605 * inside the cookie. In reality, this is only used for INIT-ACK processing
606 * since all other cases use "temporary" associations and can do all
607 * their work in statefuns directly.
608 */
609static int sctp_cmd_process_init(sctp_cmd_seq_t *commands,
610 struct sctp_association *asoc,
611 struct sctp_chunk *chunk,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -0700612 sctp_init_chunk_t *peer_init,
Al Virodd0fc662005-10-07 07:46:04 +0100613 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614{
615 int error;
616
617 /* We only process the init as a sideeffect in a single
618 * case. This is when we process the INIT-ACK. If we
619 * fail during INIT processing (due to malloc problems),
620 * just return the error and stop processing the stack.
621 */
Wei Yongjunde6becd2011-04-19 21:30:51 +0000622 if (!sctp_process_init(asoc, chunk, sctp_source(chunk), peer_init, gfp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 error = -ENOMEM;
624 else
625 error = 0;
626
627 return error;
628}
629
630/* Helper function to break out starting up of heartbeat timers. */
631static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds,
632 struct sctp_association *asoc)
633{
634 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635
636 /* Start a heartbeat timer for each transport on the association.
637 * hold a reference on the transport to make sure none of
638 * the needed data structures go away.
639 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700640 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
642 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
643 sctp_transport_hold(t);
644 }
645}
646
647static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds,
648 struct sctp_association *asoc)
649{
650 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
652 /* Stop all heartbeat timers. */
653
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700654 list_for_each_entry(t, &asoc->peer.transport_addr_list,
655 transports) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 if (del_timer(&t->hb_timer))
657 sctp_transport_put(t);
658 }
659}
660
661/* Helper function to stop any pending T3-RTX timers */
662static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900663 struct sctp_association *asoc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664{
665 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700667 list_for_each_entry(t, &asoc->peer.transport_addr_list,
668 transports) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 if (timer_pending(&t->T3_rtx_timer) &&
670 del_timer(&t->T3_rtx_timer)) {
671 sctp_transport_put(t);
672 }
673 }
674}
675
676
677/* Helper function to update the heartbeat timer. */
678static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 struct sctp_transport *t)
680{
681 /* Update the heartbeat timer. */
682 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
683 sctp_transport_hold(t);
684}
685
686/* Helper function to handle the reception of an HEARTBEAT ACK. */
687static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
688 struct sctp_association *asoc,
689 struct sctp_transport *t,
690 struct sctp_chunk *chunk)
691{
692 sctp_sender_hb_info_t *hbinfo;
Michio Honda34d2d892011-06-17 11:22:35 +0900693 int was_unconfirmed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694
695 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
696 * HEARTBEAT should clear the error counter of the destination
697 * transport address to which the HEARTBEAT was sent.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 */
699 t->error_count = 0;
Thomas Graff8d96052011-07-07 00:28:35 +0000700
701 /*
702 * Although RFC4960 specifies that the overall error count must
703 * be cleared when a HEARTBEAT ACK is received, we make an
704 * exception while in SHUTDOWN PENDING. If the peer keeps its
705 * window shut forever, we may never be able to transmit our
706 * outstanding data and rely on the retransmission limit be reached
707 * to shutdown the association.
708 */
709 if (t->asoc->state != SCTP_STATE_SHUTDOWN_PENDING)
710 t->asoc->overall_error_count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
Vlad Yasevichfaee47c2009-02-13 08:33:43 +0000712 /* Clear the hb_sent flag to signal that we had a good
713 * acknowledgement.
714 */
715 t->hb_sent = 0;
716
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 /* Mark the destination transport address as active if it is not so
718 * marked.
719 */
Michio Honda34d2d892011-06-17 11:22:35 +0900720 if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) {
721 was_unconfirmed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
723 SCTP_HEARTBEAT_SUCCESS);
Michio Honda34d2d892011-06-17 11:22:35 +0900724 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
Neil Horman5aa93bc2012-07-21 07:56:07 +0000726 if (t->state == SCTP_PF)
727 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
728 SCTP_HEARTBEAT_SUCCESS);
729
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 /* The receiver of the HEARTBEAT ACK should also perform an
731 * RTT measurement for that destination transport address
732 * using the time value carried in the HEARTBEAT ACK chunk.
Vlad Yaseviche533ca12007-01-30 14:36:14 -0800733 * If the transport's rto_pending variable has been cleared,
734 * it was most likely due to a retransmit. However, we want
735 * to re-enable it to properly update the rto.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 */
Vlad Yaseviche533ca12007-01-30 14:36:14 -0800737 if (t->rto_pending == 0)
738 t->rto_pending = 1;
739
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data;
741 sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at));
Sridhar Samudralaad8fec12006-07-21 14:48:50 -0700742
743 /* Update the heartbeat timer. */
744 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
745 sctp_transport_hold(t);
Michio Honda34d2d892011-06-17 11:22:35 +0900746
747 if (was_unconfirmed && asoc->peer.transport_count == 1)
748 sctp_transport_immediate_rtx(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749}
750
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751
752/* Helper function to process the process SACK command. */
753static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds,
754 struct sctp_association *asoc,
Nicolas Dichteledfee032012-10-03 05:43:22 +0000755 struct sctp_chunk *chunk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756{
Vlad Yasevich2e3216c2008-06-19 16:08:18 -0700757 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758
Nicolas Dichteledfee032012-10-03 05:43:22 +0000759 if (sctp_outq_sack(&asoc->outqueue, chunk)) {
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000760 struct net *net = sock_net(asoc->base.sk);
761
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 /* There are no more TSNs awaiting SACK. */
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000763 err = sctp_do_sm(net, SCTP_EVENT_T_OTHER,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN),
765 asoc->state, asoc->ep, asoc, NULL,
766 GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 }
768
769 return err;
770}
771
772/* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
773 * the transport for a shutdown chunk.
774 */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900775static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 struct sctp_association *asoc,
777 struct sctp_chunk *chunk)
778{
779 struct sctp_transport *t;
780
Vlad Yasevichc17b02b2010-04-30 21:42:43 -0400781 if (chunk->transport)
782 t = chunk->transport;
783 else {
784 t = sctp_assoc_choose_alter_transport(asoc,
Wei Yongjun9919b452009-05-12 21:52:51 +0800785 asoc->shutdown_last_sent_to);
Vlad Yasevichc17b02b2010-04-30 21:42:43 -0400786 chunk->transport = t;
787 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 asoc->shutdown_last_sent_to = t;
789 asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790}
791
792/* Helper function to change the state of an association. */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900793static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 struct sctp_association *asoc,
795 sctp_state_t state)
796{
797 struct sock *sk = asoc->base.sk;
798
799 asoc->state = state;
800
Frank Filz3f7a87d2005-06-20 13:14:57 -0700801 SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n",
802 asoc, sctp_state_tbl[state]);
803
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 if (sctp_style(sk, TCP)) {
Frank Filz3f7a87d2005-06-20 13:14:57 -0700805 /* Change the sk->sk_state of a TCP-style socket that has
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200806 * successfully completed a connect() call.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 */
808 if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED))
809 sk->sk_state = SCTP_SS_ESTABLISHED;
810
811 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
812 if (sctp_state(asoc, SHUTDOWN_RECEIVED) &&
813 sctp_sstate(sk, ESTABLISHED))
814 sk->sk_shutdown |= RCV_SHUTDOWN;
815 }
816
Frank Filz3f7a87d2005-06-20 13:14:57 -0700817 if (sctp_state(asoc, COOKIE_WAIT)) {
818 /* Reset init timeouts since they may have been
819 * increased due to timer expirations.
820 */
821 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
Vladislav Yasevich1e7d3d92005-11-11 16:06:16 -0800822 asoc->rto_initial;
Frank Filz3f7a87d2005-06-20 13:14:57 -0700823 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
Vladislav Yasevich1e7d3d92005-11-11 16:06:16 -0800824 asoc->rto_initial;
Frank Filz3f7a87d2005-06-20 13:14:57 -0700825 }
826
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 if (sctp_state(asoc, ESTABLISHED) ||
828 sctp_state(asoc, CLOSED) ||
829 sctp_state(asoc, SHUTDOWN_RECEIVED)) {
830 /* Wake up any processes waiting in the asoc's wait queue in
831 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900832 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 if (waitqueue_active(&asoc->wait))
834 wake_up_interruptible(&asoc->wait);
835
836 /* Wake up any processes waiting in the sk's sleep queue of
837 * a TCP-style or UDP-style peeled-off socket in
838 * sctp_wait_for_accept() or sctp_wait_for_packet().
839 * For a UDP-style socket, the waiters are woken up by the
840 * notifications.
841 */
842 if (!sctp_style(sk, UDP))
843 sk->sk_state_change(sk);
844 }
845}
846
847/* Helper function to delete an association. */
848static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds,
849 struct sctp_association *asoc)
850{
851 struct sock *sk = asoc->base.sk;
852
853 /* If it is a non-temporary association belonging to a TCP-style
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900854 * listening socket that is not closed, do not free it so that accept()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 * can pick it up later.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900856 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) &&
858 (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK))
859 return;
860
861 sctp_unhash_established(asoc);
862 sctp_association_free(asoc);
863}
864
865/*
866 * ADDIP Section 4.1 ASCONF Chunk Procedures
867 * A4) Start a T-4 RTO timer, using the RTO value of the selected
868 * destination address (we use active path instead of primary path just
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900869 * because primary path may be inactive.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 */
871static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds,
872 struct sctp_association *asoc,
873 struct sctp_chunk *chunk)
874{
875 struct sctp_transport *t;
876
Wei Yongjun9919b452009-05-12 21:52:51 +0800877 t = sctp_assoc_choose_alter_transport(asoc, chunk->transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto;
879 chunk->transport = t;
880}
881
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900882/* Process an incoming Operation Error Chunk. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds,
884 struct sctp_association *asoc,
885 struct sctp_chunk *chunk)
886{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 struct sctp_errhdr *err_hdr;
Wei Yongjun3df26782009-03-02 06:46:51 +0000888 struct sctp_ulpevent *ev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
Wei Yongjun3df26782009-03-02 06:46:51 +0000890 while (chunk->chunk_end > chunk->skb->data) {
891 err_hdr = (struct sctp_errhdr *)(chunk->skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892
Wei Yongjun3df26782009-03-02 06:46:51 +0000893 ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0,
894 GFP_ATOMIC);
895 if (!ev)
896 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897
Wei Yongjun3df26782009-03-02 06:46:51 +0000898 sctp_ulpq_tail_event(&asoc->ulpq, ev);
899
900 switch (err_hdr->cause) {
901 case SCTP_ERROR_UNKNOWN_CHUNK:
902 {
903 sctp_chunkhdr_t *unk_chunk_hdr;
904
905 unk_chunk_hdr = (sctp_chunkhdr_t *)err_hdr->variable;
906 switch (unk_chunk_hdr->type) {
907 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with
908 * an ERROR chunk reporting that it did not recognized
909 * the ASCONF chunk type, the sender of the ASCONF MUST
910 * NOT send any further ASCONF chunks and MUST stop its
911 * T-4 timer.
912 */
913 case SCTP_CID_ASCONF:
914 if (asoc->peer.asconf_capable == 0)
915 break;
916
917 asoc->peer.asconf_capable = 0;
918 sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO));
Wei Yongjun3df26782009-03-02 06:46:51 +0000920 break;
921 default:
922 break;
923 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 break;
Wei Yongjun3df26782009-03-02 06:46:51 +0000925 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 default:
927 break;
928 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 }
930}
931
932/* Process variable FWDTSN chunk information. */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900933static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 struct sctp_chunk *chunk)
935{
936 struct sctp_fwdtsn_skip *skip;
937 /* Walk through all the skipped SSNs */
938 sctp_walk_fwdtsn(skip, chunk) {
939 sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn));
940 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941}
942
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900943/* Helper function to remove the association non-primary peer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 * transports.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900945 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946static void sctp_cmd_del_non_primary(struct sctp_association *asoc)
947{
948 struct sctp_transport *t;
949 struct list_head *pos;
950 struct list_head *temp;
951
952 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
953 t = list_entry(pos, struct sctp_transport, transports);
Al Viro5f242a12006-11-20 17:05:23 -0800954 if (!sctp_cmp_addr_exact(&t->ipaddr,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900955 &asoc->peer.primary_addr)) {
Al Viro38a03142006-11-20 17:06:45 -0800956 sctp_assoc_del_peer(asoc, &t->ipaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 }
958 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959}
960
Sridhar Samudrala8de8c872006-05-19 10:58:12 -0700961/* Helper function to set sk_err on a 1-1 style socket. */
962static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error)
963{
964 struct sock *sk = asoc->base.sk;
965
966 if (!sctp_style(sk, UDP))
967 sk->sk_err = error;
968}
969
Vlad Yasevich07d93962007-05-04 13:55:27 -0700970/* Helper function to generate an association change event */
971static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands,
972 struct sctp_association *asoc,
973 u8 state)
974{
975 struct sctp_ulpevent *ev;
976
977 ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0,
978 asoc->c.sinit_num_ostreams,
979 asoc->c.sinit_max_instreams,
980 NULL, GFP_ATOMIC);
981 if (ev)
982 sctp_ulpq_tail_event(&asoc->ulpq, ev);
983}
984
985/* Helper function to generate an adaptation indication event */
986static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands,
987 struct sctp_association *asoc)
988{
989 struct sctp_ulpevent *ev;
990
991 ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC);
992
993 if (ev)
994 sctp_ulpq_tail_event(&asoc->ulpq, ev);
995}
996
Vlad Yasevich96cd0d32008-09-08 14:00:26 -0400997
998static void sctp_cmd_t1_timer_update(struct sctp_association *asoc,
999 sctp_event_timeout_t timer,
1000 char *name)
1001{
1002 struct sctp_transport *t;
1003
1004 t = asoc->init_last_sent_to;
1005 asoc->init_err_counter++;
1006
1007 if (t->init_sent_count > (asoc->init_cycle + 1)) {
1008 asoc->timeouts[timer] *= 2;
1009 if (asoc->timeouts[timer] > asoc->max_init_timeo) {
1010 asoc->timeouts[timer] = asoc->max_init_timeo;
1011 }
1012 asoc->init_cycle++;
1013 SCTP_DEBUG_PRINTK(
1014 "T1 %s Timeout adjustment"
1015 " init_err_counter: %d"
1016 " cycle: %d"
1017 " timeout: %ld\n",
1018 name,
1019 asoc->init_err_counter,
1020 asoc->init_cycle,
1021 asoc->timeouts[timer]);
1022 }
1023
1024}
1025
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -04001026/* Send the whole message, chunk by chunk, to the outqueue.
1027 * This way the whole message is queued up and bundling if
1028 * encouraged for small fragments.
1029 */
1030static int sctp_cmd_send_msg(struct sctp_association *asoc,
1031 struct sctp_datamsg *msg)
1032{
1033 struct sctp_chunk *chunk;
1034 int error = 0;
1035
1036 list_for_each_entry(chunk, &msg->chunks, frag_list) {
1037 error = sctp_outq_tail(&asoc->outqueue, chunk);
1038 if (error)
1039 break;
1040 }
1041
1042 return error;
1043}
1044
1045
Vlad Yasevichc0786692010-04-28 08:47:22 +00001046/* Sent the next ASCONF packet currently stored in the association.
1047 * This happens after the ASCONF_ACK was succeffully processed.
1048 */
1049static void sctp_cmd_send_asconf(struct sctp_association *asoc)
1050{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001051 struct net *net = sock_net(asoc->base.sk);
1052
Vlad Yasevichc0786692010-04-28 08:47:22 +00001053 /* Send the next asconf chunk from the addip chunk
1054 * queue.
1055 */
1056 if (!list_empty(&asoc->addip_chunk_list)) {
1057 struct list_head *entry = asoc->addip_chunk_list.next;
1058 struct sctp_chunk *asconf = list_entry(entry,
1059 struct sctp_chunk, list);
1060 list_del_init(entry);
1061
1062 /* Hold the chunk until an ASCONF_ACK is received. */
1063 sctp_chunk_hold(asconf);
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001064 if (sctp_primitive_ASCONF(net, asoc, asconf))
Vlad Yasevichc0786692010-04-28 08:47:22 +00001065 sctp_chunk_free(asconf);
1066 else
1067 asoc->addip_last_asconf = asconf;
1068 }
1069}
1070
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -04001071
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072/* These three macros allow us to pull the debugging code out of the
1073 * main flow of sctp_do_sm() to keep attention focused on the real
1074 * functionality there.
1075 */
1076#define DEBUG_PRE \
1077 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
1078 "ep %p, %s, %s, asoc %p[%s], %s\n", \
1079 ep, sctp_evttype_tbl[event_type], \
1080 (*debug_fn)(subtype), asoc, \
1081 sctp_state_tbl[state], state_fn->name)
1082
1083#define DEBUG_POST \
1084 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
1085 "asoc %p, status: %s\n", \
1086 asoc, sctp_status_tbl[status])
1087
1088#define DEBUG_POST_SFX \
1089 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
1090 error, asoc, \
1091 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
1092 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
1093
1094/*
1095 * This is the master state machine processing function.
1096 *
1097 * If you want to understand all of lksctp, this is a
1098 * good place to start.
1099 */
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001100int sctp_do_sm(struct net *net, sctp_event_t event_type, sctp_subtype_t subtype,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 sctp_state_t state,
1102 struct sctp_endpoint *ep,
1103 struct sctp_association *asoc,
1104 void *event_arg,
Al Virodd0fc662005-10-07 07:46:04 +01001105 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106{
1107 sctp_cmd_seq_t commands;
1108 const sctp_sm_table_entry_t *state_fn;
1109 sctp_disposition_t status;
1110 int error = 0;
1111 typedef const char *(printfn_t)(sctp_subtype_t);
1112
1113 static printfn_t *table[] = {
1114 NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname,
1115 };
1116 printfn_t *debug_fn __attribute__ ((unused)) = table[event_type];
1117
1118 /* Look up the state function, run it, and then process the
1119 * side effects. These three steps are the heart of lksctp.
1120 */
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001121 state_fn = sctp_sm_lookup_event(net, event_type, state, subtype);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122
1123 sctp_init_cmd_seq(&commands);
1124
1125 DEBUG_PRE;
Eric W. Biederman24cb81a2012-08-07 07:28:09 +00001126 status = (*state_fn->fn)(net, ep, asoc, subtype, event_arg, &commands);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 DEBUG_POST;
1128
1129 error = sctp_side_effects(event_type, subtype, state,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001130 ep, asoc, event_arg, status,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 &commands, gfp);
1132 DEBUG_POST_SFX;
1133
1134 return error;
1135}
1136
1137#undef DEBUG_PRE
1138#undef DEBUG_POST
1139
1140/*****************************************************************
1141 * This the master state function side effect processing function.
1142 *****************************************************************/
1143static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
1144 sctp_state_t state,
1145 struct sctp_endpoint *ep,
1146 struct sctp_association *asoc,
1147 void *event_arg,
1148 sctp_disposition_t status,
1149 sctp_cmd_seq_t *commands,
Al Virodd0fc662005-10-07 07:46:04 +01001150 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151{
1152 int error;
1153
1154 /* FIXME - Most of the dispositions left today would be categorized
1155 * as "exceptional" dispositions. For those dispositions, it
1156 * may not be proper to run through any of the commands at all.
1157 * For example, the command interpreter might be run only with
1158 * disposition SCTP_DISPOSITION_CONSUME.
1159 */
1160 if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state,
1161 ep, asoc,
1162 event_arg, status,
1163 commands, gfp)))
1164 goto bail;
1165
1166 switch (status) {
1167 case SCTP_DISPOSITION_DISCARD:
1168 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
1169 "event_type %d, event_id %d\n",
1170 state, event_type, subtype.chunk);
1171 break;
1172
1173 case SCTP_DISPOSITION_NOMEM:
1174 /* We ran out of memory, so we need to discard this
1175 * packet.
1176 */
1177 /* BUG--we should now recover some memory, probably by
1178 * reneging...
1179 */
1180 error = -ENOMEM;
1181 break;
1182
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001183 case SCTP_DISPOSITION_DELETE_TCB:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 /* This should now be a command. */
1185 break;
1186
1187 case SCTP_DISPOSITION_CONSUME:
1188 case SCTP_DISPOSITION_ABORT:
1189 /*
1190 * We should no longer have much work to do here as the
1191 * real work has been done as explicit commands above.
1192 */
1193 break;
1194
1195 case SCTP_DISPOSITION_VIOLATION:
Joe Perchese87cc472012-05-13 21:56:26 +00001196 net_err_ratelimited("protocol violation state %d chunkid %d\n",
1197 state, subtype.chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 break;
1199
1200 case SCTP_DISPOSITION_NOT_IMPL:
Joe Perches145ce502010-08-24 13:21:08 +00001201 pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n",
1202 state, event_type, subtype.chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 break;
1204
1205 case SCTP_DISPOSITION_BUG:
Joe Perches145ce502010-08-24 13:21:08 +00001206 pr_err("bug in state %d, event_type %d, event_id %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 state, event_type, subtype.chunk);
1208 BUG();
1209 break;
1210
1211 default:
Joe Perches145ce502010-08-24 13:21:08 +00001212 pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 status, state, event_type, subtype.chunk);
1214 BUG();
1215 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001216 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217
1218bail:
1219 return error;
1220}
1221
1222/********************************************************************
1223 * 2nd Level Abstractions
1224 ********************************************************************/
1225
1226/* This is the side-effect interpreter. */
1227static int sctp_cmd_interpreter(sctp_event_t event_type,
1228 sctp_subtype_t subtype,
1229 sctp_state_t state,
1230 struct sctp_endpoint *ep,
1231 struct sctp_association *asoc,
1232 void *event_arg,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001233 sctp_disposition_t status,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234 sctp_cmd_seq_t *commands,
Al Virodd0fc662005-10-07 07:46:04 +01001235 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236{
1237 int error = 0;
1238 int force;
1239 sctp_cmd_t *cmd;
1240 struct sctp_chunk *new_obj;
1241 struct sctp_chunk *chunk = NULL;
1242 struct sctp_packet *packet;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 struct timer_list *timer;
1244 unsigned long timeout;
1245 struct sctp_transport *t;
1246 struct sctp_sackhdr sackh;
1247 int local_cork = 0;
1248
1249 if (SCTP_EVENT_T_TIMEOUT != event_type)
Joe Perchesea110732011-06-13 16:21:26 +00001250 chunk = event_arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251
1252 /* Note: This whole file is a huge candidate for rework.
1253 * For example, each command could either have its own handler, so
1254 * the loop would look like:
1255 * while (cmds)
1256 * cmd->handle(x, y, z)
1257 * --jgrimm
1258 */
1259 while (NULL != (cmd = sctp_next_cmd(commands))) {
1260 switch (cmd->verb) {
1261 case SCTP_CMD_NOP:
1262 /* Do nothing. */
1263 break;
1264
1265 case SCTP_CMD_NEW_ASOC:
1266 /* Register a new association. */
1267 if (local_cork) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001268 sctp_outq_uncork(&asoc->outqueue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 local_cork = 0;
1270 }
1271 asoc = cmd->obj.ptr;
1272 /* Register with the endpoint. */
1273 sctp_endpoint_add_asoc(ep, asoc);
1274 sctp_hash_established(asoc);
1275 break;
1276
1277 case SCTP_CMD_UPDATE_ASSOC:
1278 sctp_assoc_update(asoc, cmd->obj.ptr);
1279 break;
1280
1281 case SCTP_CMD_PURGE_OUTQUEUE:
1282 sctp_outq_teardown(&asoc->outqueue);
1283 break;
1284
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001285 case SCTP_CMD_DELETE_TCB:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 if (local_cork) {
1287 sctp_outq_uncork(&asoc->outqueue);
1288 local_cork = 0;
1289 }
1290 /* Delete the current association. */
1291 sctp_cmd_delete_tcb(commands, asoc);
1292 asoc = NULL;
1293 break;
1294
1295 case SCTP_CMD_NEW_STATE:
1296 /* Enter a new state. */
1297 sctp_cmd_new_state(commands, asoc, cmd->obj.state);
1298 break;
1299
1300 case SCTP_CMD_REPORT_TSN:
1301 /* Record the arrival of a TSN. */
Vlad Yasevich8e1ee182008-10-08 14:18:39 -07001302 error = sctp_tsnmap_mark(&asoc->peer.tsn_map,
Neil Horman42448542012-06-30 03:04:26 +00001303 cmd->obj.u32, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 break;
1305
1306 case SCTP_CMD_REPORT_FWDTSN:
1307 /* Move the Cumulattive TSN Ack ahead. */
1308 sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32);
1309
Vlad Yasevichea2dfb32007-07-13 17:01:19 -04001310 /* purge the fragmentation queue */
1311 sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32);
1312
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313 /* Abort any in progress partial delivery. */
1314 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
1315 break;
1316
1317 case SCTP_CMD_PROCESS_FWDTSN:
1318 sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.ptr);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001319 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320
1321 case SCTP_CMD_GEN_SACK:
1322 /* Generate a Selective ACK.
1323 * The argument tells us whether to just count
1324 * the packet and MAYBE generate a SACK, or
1325 * force a SACK out.
1326 */
1327 force = cmd->obj.i32;
1328 error = sctp_gen_sack(asoc, force, commands);
1329 break;
1330
1331 case SCTP_CMD_PROCESS_SACK:
1332 /* Process an inbound SACK. */
1333 error = sctp_cmd_process_sack(commands, asoc,
1334 cmd->obj.ptr);
1335 break;
1336
1337 case SCTP_CMD_GEN_INIT_ACK:
1338 /* Generate an INIT ACK chunk. */
1339 new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC,
1340 0);
1341 if (!new_obj)
1342 goto nomem;
1343
1344 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1345 SCTP_CHUNK(new_obj));
1346 break;
1347
1348 case SCTP_CMD_PEER_INIT:
1349 /* Process a unified INIT from the peer.
1350 * Note: Only used during INIT-ACK processing. If
1351 * there is an error just return to the outter
1352 * layer which will bail.
1353 */
1354 error = sctp_cmd_process_init(commands, asoc, chunk,
1355 cmd->obj.ptr, gfp);
1356 break;
1357
1358 case SCTP_CMD_GEN_COOKIE_ECHO:
1359 /* Generate a COOKIE ECHO chunk. */
1360 new_obj = sctp_make_cookie_echo(asoc, chunk);
1361 if (!new_obj) {
1362 if (cmd->obj.ptr)
1363 sctp_chunk_free(cmd->obj.ptr);
1364 goto nomem;
1365 }
1366 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1367 SCTP_CHUNK(new_obj));
1368
1369 /* If there is an ERROR chunk to be sent along with
1370 * the COOKIE_ECHO, send it, too.
1371 */
1372 if (cmd->obj.ptr)
1373 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1374 SCTP_CHUNK(cmd->obj.ptr));
1375
Vlad Yasevich96cd0d32008-09-08 14:00:26 -04001376 if (new_obj->transport) {
1377 new_obj->transport->init_sent_count++;
1378 asoc->init_last_sent_to = new_obj->transport;
1379 }
1380
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 /* FIXME - Eventually come up with a cleaner way to
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001382 * enabling COOKIE-ECHO + DATA bundling during
1383 * multihoming stale cookie scenarios, the following
1384 * command plays with asoc->peer.retran_path to
1385 * avoid the problem of sending the COOKIE-ECHO and
1386 * DATA in different paths, which could result
1387 * in the association being ABORTed if the DATA chunk
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 * is processed first by the server. Checking the
1389 * init error counter simply causes this command
1390 * to be executed only during failed attempts of
1391 * association establishment.
1392 */
Frank Filz3f7a87d2005-06-20 13:14:57 -07001393 if ((asoc->peer.retran_path !=
1394 asoc->peer.primary_path) &&
1395 (asoc->init_err_counter > 0)) {
1396 sctp_add_cmd_sf(commands,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001397 SCTP_CMD_FORCE_PRIM_RETRAN,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 SCTP_NULL());
1399 }
1400
1401 break;
1402
1403 case SCTP_CMD_GEN_SHUTDOWN:
1404 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1405 * Reset error counts.
1406 */
1407 asoc->overall_error_count = 0;
1408
1409 /* Generate a SHUTDOWN chunk. */
1410 new_obj = sctp_make_shutdown(asoc, chunk);
1411 if (!new_obj)
1412 goto nomem;
1413 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1414 SCTP_CHUNK(new_obj));
1415 break;
1416
1417 case SCTP_CMD_CHUNK_ULP:
1418 /* Send a chunk to the sockets layer. */
1419 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1420 "chunk_up:", cmd->obj.ptr,
1421 "ulpq:", &asoc->ulpq);
1422 sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.ptr,
1423 GFP_ATOMIC);
1424 break;
1425
1426 case SCTP_CMD_EVENT_ULP:
1427 /* Send a notification to the sockets layer. */
1428 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1429 "event_up:",cmd->obj.ptr,
1430 "ulpq:",&asoc->ulpq);
1431 sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ptr);
1432 break;
1433
1434 case SCTP_CMD_REPLY:
1435 /* If an caller has not already corked, do cork. */
1436 if (!asoc->outqueue.cork) {
1437 sctp_outq_cork(&asoc->outqueue);
1438 local_cork = 1;
1439 }
1440 /* Send a chunk to our peer. */
1441 error = sctp_outq_tail(&asoc->outqueue, cmd->obj.ptr);
1442 break;
1443
1444 case SCTP_CMD_SEND_PKT:
1445 /* Send a full packet to our peer. */
1446 packet = cmd->obj.ptr;
1447 sctp_packet_transmit(packet);
1448 sctp_ootb_pkt_free(packet);
1449 break;
1450
Vlad Yasevichb6157d82007-10-24 15:59:16 -04001451 case SCTP_CMD_T1_RETRAN:
1452 /* Mark a transport for retransmission. */
1453 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1454 SCTP_RTXR_T1_RTX);
1455 break;
1456
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 case SCTP_CMD_RETRAN:
1458 /* Mark a transport for retransmission. */
1459 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1460 SCTP_RTXR_T3_RTX);
1461 break;
1462
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463 case SCTP_CMD_ECN_CE:
1464 /* Do delayed CE processing. */
1465 sctp_do_ecn_ce_work(asoc, cmd->obj.u32);
1466 break;
1467
1468 case SCTP_CMD_ECN_ECNE:
1469 /* Do delayed ECNE processing. */
1470 new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32,
1471 chunk);
1472 if (new_obj)
1473 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1474 SCTP_CHUNK(new_obj));
1475 break;
1476
1477 case SCTP_CMD_ECN_CWR:
1478 /* Do delayed CWR processing. */
1479 sctp_do_ecn_cwr_work(asoc, cmd->obj.u32);
1480 break;
1481
1482 case SCTP_CMD_SETUP_T2:
1483 sctp_cmd_setup_t2(commands, asoc, cmd->obj.ptr);
1484 break;
1485
Thomas Graff8d96052011-07-07 00:28:35 +00001486 case SCTP_CMD_TIMER_START_ONCE:
1487 timer = &asoc->timers[cmd->obj.to];
1488
1489 if (timer_pending(timer))
1490 break;
1491 /* fall through */
1492
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 case SCTP_CMD_TIMER_START:
1494 timer = &asoc->timers[cmd->obj.to];
1495 timeout = asoc->timeouts[cmd->obj.to];
Kris Katterjohn09a62662006-01-08 22:24:28 -08001496 BUG_ON(!timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497
1498 timer->expires = jiffies + timeout;
1499 sctp_association_hold(asoc);
1500 add_timer(timer);
1501 break;
1502
1503 case SCTP_CMD_TIMER_RESTART:
1504 timer = &asoc->timers[cmd->obj.to];
1505 timeout = asoc->timeouts[cmd->obj.to];
1506 if (!mod_timer(timer, jiffies + timeout))
1507 sctp_association_hold(asoc);
1508 break;
1509
1510 case SCTP_CMD_TIMER_STOP:
1511 timer = &asoc->timers[cmd->obj.to];
1512 if (timer_pending(timer) && del_timer(timer))
1513 sctp_association_put(asoc);
1514 break;
1515
Frank Filz3f7a87d2005-06-20 13:14:57 -07001516 case SCTP_CMD_INIT_CHOOSE_TRANSPORT:
1517 chunk = cmd->obj.ptr;
Wei Yongjun9919b452009-05-12 21:52:51 +08001518 t = sctp_assoc_choose_alter_transport(asoc,
1519 asoc->init_last_sent_to);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001520 asoc->init_last_sent_to = t;
1521 chunk->transport = t;
1522 t->init_sent_count++;
Vlad Yaseviche0e9db12009-11-23 15:53:57 -05001523 /* Set the new transport as primary */
1524 sctp_assoc_set_primary(asoc, t);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001525 break;
1526
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 case SCTP_CMD_INIT_RESTART:
1528 /* Do the needed accounting and updates
1529 * associated with restarting an initialization
Frank Filz3f7a87d2005-06-20 13:14:57 -07001530 * timer. Only multiply the timeout by two if
1531 * all transports have been tried at the current
1532 * timeout.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533 */
Vlad Yasevich96cd0d32008-09-08 14:00:26 -04001534 sctp_cmd_t1_timer_update(asoc,
1535 SCTP_EVENT_TIMEOUT_T1_INIT,
1536 "INIT");
Frank Filz3f7a87d2005-06-20 13:14:57 -07001537
1538 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
1539 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
1540 break;
1541
1542 case SCTP_CMD_COOKIEECHO_RESTART:
1543 /* Do the needed accounting and updates
1544 * associated with restarting an initialization
1545 * timer. Only multiply the timeout by two if
1546 * all transports have been tried at the current
1547 * timeout.
1548 */
Vlad Yasevich96cd0d32008-09-08 14:00:26 -04001549 sctp_cmd_t1_timer_update(asoc,
1550 SCTP_EVENT_TIMEOUT_T1_COOKIE,
1551 "COOKIE");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552
1553 /* If we've sent any data bundled with
1554 * COOKIE-ECHO we need to resend.
1555 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07001556 list_for_each_entry(t, &asoc->peer.transport_addr_list,
1557 transports) {
Vlad Yasevichb6157d82007-10-24 15:59:16 -04001558 sctp_retransmit_mark(&asoc->outqueue, t,
1559 SCTP_RTXR_T1_RTX);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560 }
1561
1562 sctp_add_cmd_sf(commands,
1563 SCTP_CMD_TIMER_RESTART,
Frank Filz3f7a87d2005-06-20 13:14:57 -07001564 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565 break;
1566
1567 case SCTP_CMD_INIT_FAILED:
Al Virodc251b22006-11-20 17:00:44 -08001568 sctp_cmd_init_failed(commands, asoc, cmd->obj.err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 break;
1570
1571 case SCTP_CMD_ASSOC_FAILED:
1572 sctp_cmd_assoc_failed(commands, asoc, event_type,
Al Viro5be291f2006-11-20 17:01:06 -08001573 subtype, chunk, cmd->obj.err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001574 break;
1575
Frank Filz3f7a87d2005-06-20 13:14:57 -07001576 case SCTP_CMD_INIT_COUNTER_INC:
1577 asoc->init_err_counter++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578 break;
1579
Frank Filz3f7a87d2005-06-20 13:14:57 -07001580 case SCTP_CMD_INIT_COUNTER_RESET:
1581 asoc->init_err_counter = 0;
1582 asoc->init_cycle = 0;
Vlad Yasevich96cd0d32008-09-08 14:00:26 -04001583 list_for_each_entry(t, &asoc->peer.transport_addr_list,
1584 transports) {
1585 t->init_sent_count = 0;
1586 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587 break;
1588
1589 case SCTP_CMD_REPORT_DUP:
1590 sctp_tsnmap_mark_dup(&asoc->peer.tsn_map,
1591 cmd->obj.u32);
1592 break;
1593
1594 case SCTP_CMD_REPORT_BAD_TAG:
1595 SCTP_DEBUG_PRINTK("vtag mismatch!\n");
1596 break;
1597
1598 case SCTP_CMD_STRIKE:
1599 /* Mark one strike against a transport. */
Neil Horman5aa93bc2012-07-21 07:56:07 +00001600 sctp_do_8_2_transport_strike(commands, asoc,
1601 cmd->obj.transport, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001602 break;
1603
Vlad Yasevich7e990132009-03-02 09:46:14 +00001604 case SCTP_CMD_TRANSPORT_IDLE:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605 t = cmd->obj.transport;
Vlad Yasevich7e990132009-03-02 09:46:14 +00001606 sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE);
1607 break;
1608
1609 case SCTP_CMD_TRANSPORT_HB_SENT:
1610 t = cmd->obj.transport;
Neil Horman5aa93bc2012-07-21 07:56:07 +00001611 sctp_do_8_2_transport_strike(commands, asoc,
1612 t, 1);
Vlad Yasevich7e990132009-03-02 09:46:14 +00001613 t->hb_sent = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 break;
1615
1616 case SCTP_CMD_TRANSPORT_ON:
1617 t = cmd->obj.transport;
1618 sctp_cmd_transport_on(commands, asoc, t, chunk);
1619 break;
1620
1621 case SCTP_CMD_HB_TIMERS_START:
1622 sctp_cmd_hb_timers_start(commands, asoc);
1623 break;
1624
1625 case SCTP_CMD_HB_TIMER_UPDATE:
1626 t = cmd->obj.transport;
Gui Jianfeng765ff022008-04-12 18:55:12 -07001627 sctp_cmd_hb_timer_update(commands, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628 break;
1629
1630 case SCTP_CMD_HB_TIMERS_STOP:
1631 sctp_cmd_hb_timers_stop(commands, asoc);
1632 break;
1633
1634 case SCTP_CMD_REPORT_ERROR:
1635 error = cmd->obj.error;
1636 break;
1637
1638 case SCTP_CMD_PROCESS_CTSN:
1639 /* Dummy up a SACK for processing. */
Al Viro2178eda2006-11-20 17:26:53 -08001640 sackh.cum_tsn_ack = cmd->obj.be32;
Vlad Yasevichd4d6fb52009-09-04 18:20:59 -04001641 sackh.a_rwnd = asoc->peer.rwnd +
1642 asoc->outqueue.outstanding_bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 sackh.num_gap_ack_blocks = 0;
1644 sackh.num_dup_tsns = 0;
Zijie Panf6e80ab2012-10-15 03:56:39 +00001645 chunk->subh.sack_hdr = &sackh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK,
Zijie Panf6e80ab2012-10-15 03:56:39 +00001647 SCTP_CHUNK(chunk));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 break;
1649
1650 case SCTP_CMD_DISCARD_PACKET:
Vlad Yasevich2e3216c2008-06-19 16:08:18 -07001651 /* We need to discard the whole packet.
1652 * Uncork the queue since there might be
1653 * responses pending
1654 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655 chunk->pdiscard = 1;
Vlad Yasevich2e3216c2008-06-19 16:08:18 -07001656 if (asoc) {
1657 sctp_outq_uncork(&asoc->outqueue);
1658 local_cork = 0;
1659 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660 break;
1661
1662 case SCTP_CMD_RTO_PENDING:
1663 t = cmd->obj.transport;
1664 t->rto_pending = 1;
1665 break;
1666
1667 case SCTP_CMD_PART_DELIVER:
1668 sctp_ulpq_partial_delivery(&asoc->ulpq, cmd->obj.ptr,
1669 GFP_ATOMIC);
1670 break;
1671
1672 case SCTP_CMD_RENEGE:
1673 sctp_ulpq_renege(&asoc->ulpq, cmd->obj.ptr,
1674 GFP_ATOMIC);
1675 break;
1676
1677 case SCTP_CMD_SETUP_T4:
1678 sctp_cmd_setup_t4(commands, asoc, cmd->obj.ptr);
1679 break;
1680
1681 case SCTP_CMD_PROCESS_OPERR:
1682 sctp_cmd_process_operr(commands, asoc, chunk);
1683 break;
1684 case SCTP_CMD_CLEAR_INIT_TAG:
1685 asoc->peer.i.init_tag = 0;
1686 break;
1687 case SCTP_CMD_DEL_NON_PRIMARY:
1688 sctp_cmd_del_non_primary(asoc);
1689 break;
1690 case SCTP_CMD_T3_RTX_TIMERS_STOP:
1691 sctp_cmd_t3_rtx_timers_stop(commands, asoc);
1692 break;
1693 case SCTP_CMD_FORCE_PRIM_RETRAN:
1694 t = asoc->peer.retran_path;
1695 asoc->peer.retran_path = asoc->peer.primary_path;
1696 error = sctp_outq_uncork(&asoc->outqueue);
1697 local_cork = 0;
1698 asoc->peer.retran_path = t;
1699 break;
Sridhar Samudrala8de8c872006-05-19 10:58:12 -07001700 case SCTP_CMD_SET_SK_ERR:
1701 sctp_cmd_set_sk_err(asoc, cmd->obj.error);
1702 break;
Vlad Yasevich07d93962007-05-04 13:55:27 -07001703 case SCTP_CMD_ASSOC_CHANGE:
1704 sctp_cmd_assoc_change(commands, asoc,
1705 cmd->obj.u8);
1706 break;
1707 case SCTP_CMD_ADAPTATION_IND:
1708 sctp_cmd_adaptation_ind(commands, asoc);
1709 break;
1710
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07001711 case SCTP_CMD_ASSOC_SHKEY:
1712 error = sctp_auth_asoc_init_active_key(asoc,
1713 GFP_ATOMIC);
1714 break;
Gui Jianfengf4ad85c2008-04-12 18:39:34 -07001715 case SCTP_CMD_UPDATE_INITTAG:
1716 asoc->peer.i.init_tag = cmd->obj.u32;
1717 break;
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -04001718 case SCTP_CMD_SEND_MSG:
1719 if (!asoc->outqueue.cork) {
1720 sctp_outq_cork(&asoc->outqueue);
1721 local_cork = 1;
1722 }
1723 error = sctp_cmd_send_msg(asoc, cmd->obj.msg);
1724 break;
Vlad Yasevichc0786692010-04-28 08:47:22 +00001725 case SCTP_CMD_SEND_NEXT_ASCONF:
1726 sctp_cmd_send_asconf(asoc);
1727 break;
Wei Yongjuna000c012011-05-29 23:23:36 +00001728 case SCTP_CMD_PURGE_ASCONF_QUEUE:
1729 sctp_asconf_queue_teardown(asoc);
1730 break;
Max Matveevd5ccd492011-08-29 21:02:24 +00001731
1732 case SCTP_CMD_SET_ASOC:
1733 asoc = cmd->obj.asoc;
1734 break;
1735
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736 default:
Joe Perches145ce502010-08-24 13:21:08 +00001737 pr_warn("Impossible command: %u, %p\n",
1738 cmd->verb, cmd->obj.ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001740 }
1741
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742 if (error)
1743 break;
1744 }
1745
1746out:
Vlad Yasevich2e3216c2008-06-19 16:08:18 -07001747 /* If this is in response to a received chunk, wait until
1748 * we are done with the packet to open the queue so that we don't
1749 * send multiple packets in response to a single request.
1750 */
1751 if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) {
1752 if (chunk->end_of_packet || chunk->singleton)
Vlad Yasevichd4d6fb52009-09-04 18:20:59 -04001753 error = sctp_outq_uncork(&asoc->outqueue);
Vlad Yasevich2e3216c2008-06-19 16:08:18 -07001754 } else if (local_cork)
Vlad Yasevichd4d6fb52009-09-04 18:20:59 -04001755 error = sctp_outq_uncork(&asoc->outqueue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756 return error;
1757nomem:
1758 error = -ENOMEM;
1759 goto out;
1760}
1761