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Vlad Yasevich60c778b2008-01-11 09:57:09 -05001/* SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -05006 * This file is part of the SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
8 * These functions work with the state functions in sctp_sm_statefuns.c
9 * to implement that state operations. These functions implement the
10 * steps which require modifying existing data structures.
11 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050012 * This SCTP implementation is free software;
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 * you can redistribute it and/or modify it under the terms of
14 * the GNU General Public License as published by
15 * the Free Software Foundation; either version 2, or (at your option)
16 * any later version.
17 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050018 * This SCTP implementation is distributed in the hope that it
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
20 * ************************
21 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
22 * See the GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
Jeff Kirsher4b2f13a2013-12-06 06:28:48 -080025 * along with GNU CC; see the file COPYING. If not, see
26 * <http://www.gnu.org/licenses/>.
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 *
28 * Please send any bug reports or fixes you make to the
29 * email address(es):
Daniel Borkmann91705c62013-07-23 14:51:47 +020030 * lksctp developers <linux-sctp@vger.kernel.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 * Written or modified by:
33 * La Monte H.P. Yarroll <piggy@acm.org>
34 * Karl Knutson <karl@athena.chicago.il.us>
35 * Jon Grimm <jgrimm@austin.ibm.com>
36 * Hui Huang <hui.huang@nokia.com>
37 * Dajiang Zhang <dajiang.zhang@nokia.com>
38 * Daisy Chang <daisyc@us.ibm.com>
39 * Sridhar Samudrala <sri@us.ibm.com>
40 * Ardelle Fan <ardelle.fan@intel.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 */
42
Joe Perches145ce502010-08-24 13:21:08 +000043#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <linux/skbuff.h>
46#include <linux/types.h>
47#include <linux/socket.h>
48#include <linux/ip.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090049#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <net/sock.h>
51#include <net/sctp/sctp.h>
52#include <net/sctp/sm.h>
53
54static int sctp_cmd_interpreter(sctp_event_t event_type,
55 sctp_subtype_t subtype,
56 sctp_state_t state,
57 struct sctp_endpoint *ep,
58 struct sctp_association *asoc,
59 void *event_arg,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +090060 sctp_disposition_t status,
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 sctp_cmd_seq_t *commands,
Al Virodd0fc662005-10-07 07:46:04 +010062 gfp_t gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
64 sctp_state_t state,
65 struct sctp_endpoint *ep,
66 struct sctp_association *asoc,
67 void *event_arg,
68 sctp_disposition_t status,
69 sctp_cmd_seq_t *commands,
Al Virodd0fc662005-10-07 07:46:04 +010070 gfp_t gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
Neil Horman5aa93bc2012-07-21 07:56:07 +000072static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds,
73 struct sctp_transport *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074/********************************************************************
75 * Helper functions
76 ********************************************************************/
77
78/* A helper function for delayed processing of INET ECN CE bit. */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +090079static void sctp_do_ecn_ce_work(struct sctp_association *asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 __u32 lowest_tsn)
81{
82 /* Save the TSN away for comparison when we receive CWR */
83
84 asoc->last_ecne_tsn = lowest_tsn;
85 asoc->need_ecne = 1;
86}
87
88/* Helper function for delayed processing of SCTP ECNE chunk. */
89/* RFC 2960 Appendix A
90 *
91 * RFC 2481 details a specific bit for a sender to send in
92 * the header of its next outbound TCP segment to indicate to
93 * its peer that it has reduced its congestion window. This
94 * is termed the CWR bit. For SCTP the same indication is made
95 * by including the CWR chunk. This chunk contains one data
96 * element, i.e. the TSN number that was sent in the ECNE chunk.
97 * This element represents the lowest TSN number in the datagram
98 * that was originally marked with the CE bit.
99 */
100static struct sctp_chunk *sctp_do_ecn_ecne_work(struct sctp_association *asoc,
101 __u32 lowest_tsn,
102 struct sctp_chunk *chunk)
103{
104 struct sctp_chunk *repl;
105
106 /* Our previously transmitted packet ran into some congestion
107 * so we should take action by reducing cwnd and ssthresh
108 * and then ACK our peer that we we've done so by
109 * sending a CWR.
110 */
111
112 /* First, try to determine if we want to actually lower
113 * our cwnd variables. Only lower them if the ECNE looks more
114 * recent than the last response.
115 */
116 if (TSN_lt(asoc->last_cwr_tsn, lowest_tsn)) {
117 struct sctp_transport *transport;
118
119 /* Find which transport's congestion variables
120 * need to be adjusted.
121 */
122 transport = sctp_assoc_lookup_tsn(asoc, lowest_tsn);
123
124 /* Update the congestion variables. */
125 if (transport)
126 sctp_transport_lower_cwnd(transport,
127 SCTP_LOWER_CWND_ECNE);
128 asoc->last_cwr_tsn = lowest_tsn;
129 }
130
131 /* Always try to quiet the other end. In case of lost CWR,
132 * resend last_cwr_tsn.
133 */
134 repl = sctp_make_cwr(asoc, asoc->last_cwr_tsn, chunk);
135
136 /* If we run out of memory, it will look like a lost CWR. We'll
137 * get back in sync eventually.
138 */
139 return repl;
140}
141
142/* Helper function to do delayed processing of ECN CWR chunk. */
143static void sctp_do_ecn_cwr_work(struct sctp_association *asoc,
144 __u32 lowest_tsn)
145{
146 /* Turn off ECNE getting auto-prepended to every outgoing
147 * packet
148 */
149 asoc->need_ecne = 0;
150}
151
152/* Generate SACK if necessary. We call this at the end of a packet. */
153static int sctp_gen_sack(struct sctp_association *asoc, int force,
154 sctp_cmd_seq_t *commands)
155{
156 __u32 ctsn, max_tsn_seen;
157 struct sctp_chunk *sack;
Frank Filz52ccb8e2005-12-22 11:36:46 -0800158 struct sctp_transport *trans = asoc->peer.last_data_from;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 int error = 0;
160
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900161 if (force ||
Frank Filz52ccb8e2005-12-22 11:36:46 -0800162 (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) ||
163 (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 asoc->peer.sack_needed = 1;
165
166 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
167 max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
168
169 /* From 12.2 Parameters necessary per association (i.e. the TCB):
170 *
171 * Ack State : This flag indicates if the next received packet
172 * : is to be responded to with a SACK. ...
173 * : When DATA chunks are out of order, SACK's
174 * : are not delayed (see Section 6).
175 *
176 * [This is actually not mentioned in Section 6, but we
177 * implement it here anyway. --piggy]
178 */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900179 if (max_tsn_seen != ctsn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 asoc->peer.sack_needed = 1;
181
182 /* From 6.2 Acknowledgement on Reception of DATA Chunks:
183 *
184 * Section 4.2 of [RFC2581] SHOULD be followed. Specifically,
185 * an acknowledgement SHOULD be generated for at least every
186 * second packet (not every second DATA chunk) received, and
187 * SHOULD be generated within 200 ms of the arrival of any
188 * unacknowledged DATA chunk. ...
189 */
190 if (!asoc->peer.sack_needed) {
Wei Yongjund364d922008-05-09 15:13:26 -0700191 asoc->peer.sack_cnt++;
Frank Filz52ccb8e2005-12-22 11:36:46 -0800192
193 /* Set the SACK delay timeout based on the
194 * SACK delay for the last transport
195 * data was received from, or the default
196 * for the association.
197 */
Wei Yongjund364d922008-05-09 15:13:26 -0700198 if (trans) {
199 /* We will need a SACK for the next packet. */
200 if (asoc->peer.sack_cnt >= trans->sackfreq - 1)
201 asoc->peer.sack_needed = 1;
202
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900203 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
Frank Filz52ccb8e2005-12-22 11:36:46 -0800204 trans->sackdelay;
Wei Yongjund364d922008-05-09 15:13:26 -0700205 } else {
206 /* We will need a SACK for the next packet. */
207 if (asoc->peer.sack_cnt >= asoc->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 asoc->sackdelay;
Wei Yongjund364d922008-05-09 15:13:26 -0700212 }
Frank Filz52ccb8e2005-12-22 11:36:46 -0800213
214 /* Restart the SACK timer. */
215 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
216 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 } else {
Vlad Yasevich90f2f532009-11-23 15:53:57 -0500218 asoc->a_rwnd = asoc->rwnd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 sack = sctp_make_sack(asoc);
220 if (!sack)
221 goto nomem;
222
223 asoc->peer.sack_needed = 0;
Wei Yongjund364d922008-05-09 15:13:26 -0700224 asoc->peer.sack_cnt = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
Vlad Yasevich732ba352007-01-15 19:20:21 -0800226 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228 /* Stop the SACK timer. */
229 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
230 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
231 }
Frank Filz52ccb8e2005-12-22 11:36:46 -0800232
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return error;
234nomem:
235 error = -ENOMEM;
236 return error;
237}
238
239/* When the T3-RTX timer expires, it calls this function to create the
240 * relevant state machine event.
241 */
242void sctp_generate_t3_rtx_event(unsigned long peer)
243{
244 int error;
245 struct sctp_transport *transport = (struct sctp_transport *) peer;
246 struct sctp_association *asoc = transport->asoc;
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000247 struct net *net = sock_net(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
249 /* Check whether a task is in the sock. */
250
wangweidong5bc1d1b2014-01-21 15:44:12 +0800251 bh_lock_sock(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 if (sock_owned_by_user(asoc->base.sk)) {
Daniel Borkmannbb333812013-06-28 19:49:40 +0200253 pr_debug("%s: sock is busy\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
255 /* Try again later. */
256 if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20)))
257 sctp_transport_hold(transport);
258 goto out_unlock;
259 }
260
261 /* Is this transport really dead and just waiting around for
262 * the timer to let go of the reference?
263 */
264 if (transport->dead)
265 goto out_unlock;
266
267 /* Run through the state machine. */
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000268 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX),
270 asoc->state,
271 asoc->ep, asoc,
272 transport, GFP_ATOMIC);
273
274 if (error)
275 asoc->base.sk->sk_err = -error;
276
277out_unlock:
wangweidong5bc1d1b2014-01-21 15:44:12 +0800278 bh_unlock_sock(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 sctp_transport_put(transport);
280}
281
282/* This is a sa interface for producing timeout events. It works
283 * for timeouts which use the association as their parameter.
284 */
285static void sctp_generate_timeout_event(struct sctp_association *asoc,
286 sctp_event_timeout_t timeout_type)
287{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000288 struct net *net = sock_net(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 int error = 0;
290
wangweidong5bc1d1b2014-01-21 15:44:12 +0800291 bh_lock_sock(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 if (sock_owned_by_user(asoc->base.sk)) {
Daniel Borkmannbb333812013-06-28 19:49:40 +0200293 pr_debug("%s: sock is busy: timer %d\n", __func__,
294 timeout_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
296 /* Try again later. */
297 if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20)))
298 sctp_association_hold(asoc);
299 goto out_unlock;
300 }
301
302 /* Is this association really dead and just waiting around for
303 * the timer to let go of the reference?
304 */
305 if (asoc->base.dead)
306 goto out_unlock;
307
308 /* Run through the state machine. */
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000309 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 SCTP_ST_TIMEOUT(timeout_type),
311 asoc->state, asoc->ep, asoc,
312 (void *)timeout_type, GFP_ATOMIC);
313
314 if (error)
315 asoc->base.sk->sk_err = -error;
316
317out_unlock:
wangweidong5bc1d1b2014-01-21 15:44:12 +0800318 bh_unlock_sock(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 sctp_association_put(asoc);
320}
321
322static void sctp_generate_t1_cookie_event(unsigned long data)
323{
324 struct sctp_association *asoc = (struct sctp_association *) data;
325 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE);
326}
327
328static void sctp_generate_t1_init_event(unsigned long data)
329{
330 struct sctp_association *asoc = (struct sctp_association *) data;
331 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT);
332}
333
334static void sctp_generate_t2_shutdown_event(unsigned long data)
335{
336 struct sctp_association *asoc = (struct sctp_association *) data;
337 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN);
338}
339
340static void sctp_generate_t4_rto_event(unsigned long data)
341{
342 struct sctp_association *asoc = (struct sctp_association *) data;
343 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO);
344}
345
346static void sctp_generate_t5_shutdown_guard_event(unsigned long data)
347{
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900348 struct sctp_association *asoc = (struct sctp_association *)data;
349 sctp_generate_timeout_event(asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD);
351
352} /* sctp_generate_t5_shutdown_guard_event() */
353
354static void sctp_generate_autoclose_event(unsigned long data)
355{
356 struct sctp_association *asoc = (struct sctp_association *) data;
357 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE);
358}
359
360/* Generate a heart beat event. If the sock is busy, reschedule. Make
361 * sure that the transport is still valid.
362 */
363void sctp_generate_heartbeat_event(unsigned long data)
364{
365 int error = 0;
366 struct sctp_transport *transport = (struct sctp_transport *) data;
367 struct sctp_association *asoc = transport->asoc;
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000368 struct net *net = sock_net(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
wangweidong5bc1d1b2014-01-21 15:44:12 +0800370 bh_lock_sock(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 if (sock_owned_by_user(asoc->base.sk)) {
Daniel Borkmannbb333812013-06-28 19:49:40 +0200372 pr_debug("%s: sock is busy\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
374 /* Try again later. */
375 if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20)))
376 sctp_transport_hold(transport);
377 goto out_unlock;
378 }
379
380 /* Is this structure just waiting around for us to actually
381 * get destroyed?
382 */
383 if (transport->dead)
384 goto out_unlock;
385
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000386 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT),
388 asoc->state, asoc->ep, asoc,
389 transport, GFP_ATOMIC);
390
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900391 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 asoc->base.sk->sk_err = -error;
393
394out_unlock:
wangweidong5bc1d1b2014-01-21 15:44:12 +0800395 bh_unlock_sock(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 sctp_transport_put(transport);
397}
398
Vlad Yasevich50b5d6a2010-05-06 00:56:07 -0700399/* Handle the timeout of the ICMP protocol unreachable timer. Trigger
400 * the correct state machine transition that will close the association.
401 */
402void sctp_generate_proto_unreach_event(unsigned long data)
403{
404 struct sctp_transport *transport = (struct sctp_transport *) data;
405 struct sctp_association *asoc = transport->asoc;
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000406 struct net *net = sock_net(asoc->base.sk);
wangweidongcb3f8372013-12-23 12:16:50 +0800407
wangweidong5bc1d1b2014-01-21 15:44:12 +0800408 bh_lock_sock(asoc->base.sk);
Vlad Yasevich50b5d6a2010-05-06 00:56:07 -0700409 if (sock_owned_by_user(asoc->base.sk)) {
Daniel Borkmannbb333812013-06-28 19:49:40 +0200410 pr_debug("%s: sock is busy\n", __func__);
Vlad Yasevich50b5d6a2010-05-06 00:56:07 -0700411
412 /* Try again later. */
413 if (!mod_timer(&transport->proto_unreach_timer,
414 jiffies + (HZ/20)))
415 sctp_association_hold(asoc);
416 goto out_unlock;
417 }
418
419 /* Is this structure just waiting around for us to actually
420 * get destroyed?
421 */
422 if (asoc->base.dead)
423 goto out_unlock;
424
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000425 sctp_do_sm(net, SCTP_EVENT_T_OTHER,
Vlad Yasevich50b5d6a2010-05-06 00:56:07 -0700426 SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH),
427 asoc->state, asoc->ep, asoc, transport, GFP_ATOMIC);
428
429out_unlock:
wangweidong5bc1d1b2014-01-21 15:44:12 +0800430 bh_unlock_sock(asoc->base.sk);
Vlad Yasevich50b5d6a2010-05-06 00:56:07 -0700431 sctp_association_put(asoc);
432}
433
434
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435/* Inject a SACK Timeout event into the state machine. */
436static void sctp_generate_sack_event(unsigned long data)
437{
438 struct sctp_association *asoc = (struct sctp_association *) data;
439 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK);
440}
441
442sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = {
443 NULL,
444 sctp_generate_t1_cookie_event,
445 sctp_generate_t1_init_event,
446 sctp_generate_t2_shutdown_event,
447 NULL,
448 sctp_generate_t4_rto_event,
449 sctp_generate_t5_shutdown_guard_event,
Vladislav Yasevich1e7d3d92005-11-11 16:06:16 -0800450 NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 sctp_generate_sack_event,
452 sctp_generate_autoclose_event,
453};
454
455
456/* RFC 2960 8.2 Path Failure Detection
457 *
458 * When its peer endpoint is multi-homed, an endpoint should keep a
459 * error counter for each of the destination transport addresses of the
460 * peer endpoint.
461 *
462 * Each time the T3-rtx timer expires on any address, or when a
463 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
464 * the error counter of that destination address will be incremented.
465 * When the value in the error counter exceeds the protocol parameter
466 * 'Path.Max.Retrans' of that destination address, the endpoint should
467 * mark the destination transport address as inactive, and a
468 * notification SHOULD be sent to the upper layer.
469 *
470 */
Neil Horman5aa93bc2012-07-21 07:56:07 +0000471static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t *commands,
472 struct sctp_association *asoc,
Vlad Yasevich7e990132009-03-02 09:46:14 +0000473 struct sctp_transport *transport,
474 int is_hb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475{
476 /* The check for association's overall error counter exceeding the
477 * threshold is done in the state function.
478 */
Vlad Yasevichb9f84782009-08-26 09:36:25 -0400479 /* We are here due to a timer expiration. If the timer was
480 * not a HEARTBEAT, then normal error tracking is done.
481 * If the timer was a heartbeat, we only increment error counts
482 * when we already have an outstanding HEARTBEAT that has not
483 * been acknowledged.
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300484 * Additionally, some tranport states inhibit error increments.
Sridhar Samudralaad8fec12006-07-21 14:48:50 -0700485 */
Vlad Yasevichb9f84782009-08-26 09:36:25 -0400486 if (!is_hb) {
Sridhar Samudralaad8fec12006-07-21 14:48:50 -0700487 asoc->overall_error_count++;
Vlad Yasevichb9f84782009-08-26 09:36:25 -0400488 if (transport->state != SCTP_INACTIVE)
489 transport->error_count++;
490 } else if (transport->hb_sent) {
491 if (transport->state != SCTP_UNCONFIRMED)
492 asoc->overall_error_count++;
493 if (transport->state != SCTP_INACTIVE)
494 transport->error_count++;
495 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
Neil Horman5aa93bc2012-07-21 07:56:07 +0000497 /* If the transport error count is greater than the pf_retrans
498 * threshold, and less than pathmaxrtx, then mark this transport
499 * as Partially Failed, ee SCTP Quick Failover Draft, secon 5.1,
500 * point 1
501 */
502 if ((transport->state != SCTP_PF) &&
503 (asoc->pf_retrans < transport->pathmaxrxt) &&
504 (transport->error_count > asoc->pf_retrans)) {
505
506 sctp_assoc_control_transport(asoc, transport,
507 SCTP_TRANSPORT_PF,
508 0);
509
510 /* Update the hb timer to resend a heartbeat every rto */
511 sctp_cmd_hb_timer_update(commands, transport);
512 }
513
Frank Filz3f7a87d2005-06-20 13:14:57 -0700514 if (transport->state != SCTP_INACTIVE &&
Vlad Yasevichb9f84782009-08-26 09:36:25 -0400515 (transport->error_count > transport->pathmaxrxt)) {
Daniel Borkmannbb333812013-06-28 19:49:40 +0200516 pr_debug("%s: association:%p transport addr:%pISpc failed\n",
517 __func__, asoc, &transport->ipaddr.sa);
518
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 sctp_assoc_control_transport(asoc, transport,
520 SCTP_TRANSPORT_DOWN,
521 SCTP_FAILED_THRESHOLD);
522 }
523
524 /* E2) For the destination address for which the timer
525 * expires, set RTO <- RTO * 2 ("back off the timer"). The
526 * maximum value discussed in rule C7 above (RTO.max) may be
527 * used to provide an upper bound to this doubling operation.
Vlad Yasevichfaee47c2009-02-13 08:33:43 +0000528 *
529 * Special Case: the first HB doesn't trigger exponential backoff.
Daniel Mack3ad2f3f2010-02-03 08:01:28 +0800530 * The first unacknowledged HB triggers it. We do this with a flag
Vlad Yasevichfaee47c2009-02-13 08:33:43 +0000531 * that indicates that we have an outstanding HB.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 */
Vlad Yasevich7e990132009-03-02 09:46:14 +0000533 if (!is_hb || transport->hb_sent) {
Vlad Yasevichfaee47c2009-02-13 08:33:43 +0000534 transport->rto = min((transport->rto * 2), transport->asoc->rto_max);
Michele Baldessari196d6752012-12-01 04:49:42 +0000535 sctp_max_rto(asoc, transport);
Vlad Yasevichfaee47c2009-02-13 08:33:43 +0000536 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537}
538
539/* Worker routine to handle INIT command failure. */
540static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands,
541 struct sctp_association *asoc,
Eric Dumazet95c96172012-04-15 05:58:06 +0000542 unsigned int error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543{
544 struct sctp_ulpevent *event;
545
wangweidongcb3f8372013-12-23 12:16:50 +0800546 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_CANT_STR_ASSOC,
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700547 (__u16)error, 0, 0, NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 GFP_ATOMIC);
549
550 if (event)
551 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
552 SCTP_ULPEVENT(event));
553
554 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
555 SCTP_STATE(SCTP_STATE_CLOSED));
556
557 /* SEND_FAILED sent later when cleaning up the association. */
558 asoc->outqueue.error = error;
559 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
560}
561
562/* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
563static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands,
564 struct sctp_association *asoc,
565 sctp_event_t event_type,
566 sctp_subtype_t subtype,
567 struct sctp_chunk *chunk,
Eric Dumazet95c96172012-04-15 05:58:06 +0000568 unsigned int error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569{
570 struct sctp_ulpevent *event;
Neil Hormande4594a2012-11-20 10:14:30 +0000571 struct sctp_chunk *abort;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 /* Cancel any partial delivery in progress. */
573 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
574
Vlad Yasevicha5a35e72007-03-23 11:34:08 -0700575 if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT)
576 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
577 (__u16)error, 0, 0, chunk,
578 GFP_ATOMIC);
579 else
580 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
581 (__u16)error, 0, 0, NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 GFP_ATOMIC);
583 if (event)
584 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
585 SCTP_ULPEVENT(event));
586
Neil Hormande4594a2012-11-20 10:14:30 +0000587 if (asoc->overall_error_count >= asoc->max_retrans) {
588 abort = sctp_make_violation_max_retrans(asoc, chunk);
589 if (abort)
590 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
591 SCTP_CHUNK(abort));
592 }
593
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
595 SCTP_STATE(SCTP_STATE_CLOSED));
596
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 /* SEND_FAILED sent later when cleaning up the association. */
598 asoc->outqueue.error = error;
599 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
600}
601
602/* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
603 * inside the cookie. In reality, this is only used for INIT-ACK processing
604 * since all other cases use "temporary" associations and can do all
605 * their work in statefuns directly.
606 */
607static int sctp_cmd_process_init(sctp_cmd_seq_t *commands,
608 struct sctp_association *asoc,
609 struct sctp_chunk *chunk,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -0700610 sctp_init_chunk_t *peer_init,
Al Virodd0fc662005-10-07 07:46:04 +0100611 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612{
613 int error;
614
615 /* We only process the init as a sideeffect in a single
616 * case. This is when we process the INIT-ACK. If we
617 * fail during INIT processing (due to malloc problems),
618 * just return the error and stop processing the stack.
619 */
Wei Yongjunde6becd2011-04-19 21:30:51 +0000620 if (!sctp_process_init(asoc, chunk, sctp_source(chunk), peer_init, gfp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 error = -ENOMEM;
622 else
623 error = 0;
624
625 return error;
626}
627
628/* Helper function to break out starting up of heartbeat timers. */
629static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds,
630 struct sctp_association *asoc)
631{
632 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633
634 /* Start a heartbeat timer for each transport on the association.
635 * hold a reference on the transport to make sure none of
636 * the needed data structures go away.
637 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700638 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639
640 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
641 sctp_transport_hold(t);
642 }
643}
644
645static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds,
646 struct sctp_association *asoc)
647{
648 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
650 /* Stop all heartbeat timers. */
651
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700652 list_for_each_entry(t, &asoc->peer.transport_addr_list,
653 transports) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 if (del_timer(&t->hb_timer))
655 sctp_transport_put(t);
656 }
657}
658
659/* Helper function to stop any pending T3-RTX timers */
660static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900661 struct sctp_association *asoc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662{
663 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700665 list_for_each_entry(t, &asoc->peer.transport_addr_list,
666 transports) {
Ying Xue25cc4ae2013-02-03 20:32:57 +0000667 if (del_timer(&t->T3_rtx_timer))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 sctp_transport_put(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 }
670}
671
672
673/* Helper function to update the heartbeat timer. */
674static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 struct sctp_transport *t)
676{
677 /* Update the heartbeat timer. */
678 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
679 sctp_transport_hold(t);
680}
681
682/* Helper function to handle the reception of an HEARTBEAT ACK. */
683static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
684 struct sctp_association *asoc,
685 struct sctp_transport *t,
686 struct sctp_chunk *chunk)
687{
688 sctp_sender_hb_info_t *hbinfo;
Michio Honda34d2d892011-06-17 11:22:35 +0900689 int was_unconfirmed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690
691 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
692 * HEARTBEAT should clear the error counter of the destination
693 * transport address to which the HEARTBEAT was sent.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 */
695 t->error_count = 0;
Thomas Graff8d96052011-07-07 00:28:35 +0000696
697 /*
698 * Although RFC4960 specifies that the overall error count must
699 * be cleared when a HEARTBEAT ACK is received, we make an
700 * exception while in SHUTDOWN PENDING. If the peer keeps its
701 * window shut forever, we may never be able to transmit our
702 * outstanding data and rely on the retransmission limit be reached
703 * to shutdown the association.
704 */
705 if (t->asoc->state != SCTP_STATE_SHUTDOWN_PENDING)
706 t->asoc->overall_error_count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707
Vlad Yasevichfaee47c2009-02-13 08:33:43 +0000708 /* Clear the hb_sent flag to signal that we had a good
709 * acknowledgement.
710 */
711 t->hb_sent = 0;
712
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 /* Mark the destination transport address as active if it is not so
714 * marked.
715 */
Michio Honda34d2d892011-06-17 11:22:35 +0900716 if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) {
717 was_unconfirmed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
719 SCTP_HEARTBEAT_SUCCESS);
Michio Honda34d2d892011-06-17 11:22:35 +0900720 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721
Neil Horman5aa93bc2012-07-21 07:56:07 +0000722 if (t->state == SCTP_PF)
723 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
724 SCTP_HEARTBEAT_SUCCESS);
725
Daniel Borkmann8c2f4142013-07-09 16:17:04 +0200726 /* HB-ACK was received for a the proper HB. Consider this
727 * forward progress.
728 */
729 if (t->dst)
730 dst_confirm(t->dst);
731
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 /* The receiver of the HEARTBEAT ACK should also perform an
733 * RTT measurement for that destination transport address
734 * using the time value carried in the HEARTBEAT ACK chunk.
Vlad Yaseviche533ca12007-01-30 14:36:14 -0800735 * If the transport's rto_pending variable has been cleared,
736 * it was most likely due to a retransmit. However, we want
737 * to re-enable it to properly update the rto.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 */
Vlad Yaseviche533ca12007-01-30 14:36:14 -0800739 if (t->rto_pending == 0)
740 t->rto_pending = 1;
741
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data;
743 sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at));
Sridhar Samudralaad8fec12006-07-21 14:48:50 -0700744
745 /* Update the heartbeat timer. */
746 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
747 sctp_transport_hold(t);
Michio Honda34d2d892011-06-17 11:22:35 +0900748
749 if (was_unconfirmed && asoc->peer.transport_count == 1)
750 sctp_transport_immediate_rtx(t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751}
752
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753
754/* Helper function to process the process SACK command. */
755static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds,
756 struct sctp_association *asoc,
Nicolas Dichteledfee032012-10-03 05:43:22 +0000757 struct sctp_chunk *chunk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758{
Vlad Yasevich2e3216c2008-06-19 16:08:18 -0700759 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760
Nicolas Dichteledfee032012-10-03 05:43:22 +0000761 if (sctp_outq_sack(&asoc->outqueue, chunk)) {
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000762 struct net *net = sock_net(asoc->base.sk);
763
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 /* There are no more TSNs awaiting SACK. */
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000765 err = sctp_do_sm(net, SCTP_EVENT_T_OTHER,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN),
767 asoc->state, asoc->ep, asoc, NULL,
768 GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 }
770
771 return err;
772}
773
774/* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
775 * the transport for a shutdown chunk.
776 */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900777static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 struct sctp_association *asoc,
779 struct sctp_chunk *chunk)
780{
781 struct sctp_transport *t;
782
Vlad Yasevichc17b02b2010-04-30 21:42:43 -0400783 if (chunk->transport)
784 t = chunk->transport;
785 else {
786 t = sctp_assoc_choose_alter_transport(asoc,
Wei Yongjun9919b452009-05-12 21:52:51 +0800787 asoc->shutdown_last_sent_to);
Vlad Yasevichc17b02b2010-04-30 21:42:43 -0400788 chunk->transport = t;
789 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 asoc->shutdown_last_sent_to = t;
791 asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792}
793
794/* Helper function to change the state of an association. */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900795static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 struct sctp_association *asoc,
797 sctp_state_t state)
798{
799 struct sock *sk = asoc->base.sk;
800
801 asoc->state = state;
802
Daniel Borkmannbb333812013-06-28 19:49:40 +0200803 pr_debug("%s: asoc:%p[%s]\n", __func__, asoc, sctp_state_tbl[state]);
Frank Filz3f7a87d2005-06-20 13:14:57 -0700804
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 if (sctp_style(sk, TCP)) {
Frank Filz3f7a87d2005-06-20 13:14:57 -0700806 /* Change the sk->sk_state of a TCP-style socket that has
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200807 * successfully completed a connect() call.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 */
809 if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED))
810 sk->sk_state = SCTP_SS_ESTABLISHED;
811
812 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
813 if (sctp_state(asoc, SHUTDOWN_RECEIVED) &&
814 sctp_sstate(sk, ESTABLISHED))
815 sk->sk_shutdown |= RCV_SHUTDOWN;
816 }
817
Frank Filz3f7a87d2005-06-20 13:14:57 -0700818 if (sctp_state(asoc, COOKIE_WAIT)) {
819 /* Reset init timeouts since they may have been
820 * increased due to timer expirations.
821 */
822 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
Vladislav Yasevich1e7d3d92005-11-11 16:06:16 -0800823 asoc->rto_initial;
Frank Filz3f7a87d2005-06-20 13:14:57 -0700824 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
Vladislav Yasevich1e7d3d92005-11-11 16:06:16 -0800825 asoc->rto_initial;
Frank Filz3f7a87d2005-06-20 13:14:57 -0700826 }
827
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 if (sctp_state(asoc, ESTABLISHED) ||
829 sctp_state(asoc, CLOSED) ||
830 sctp_state(asoc, SHUTDOWN_RECEIVED)) {
831 /* Wake up any processes waiting in the asoc's wait queue in
832 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900833 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 if (waitqueue_active(&asoc->wait))
835 wake_up_interruptible(&asoc->wait);
836
837 /* Wake up any processes waiting in the sk's sleep queue of
838 * a TCP-style or UDP-style peeled-off socket in
839 * sctp_wait_for_accept() or sctp_wait_for_packet().
840 * For a UDP-style socket, the waiters are woken up by the
841 * notifications.
842 */
843 if (!sctp_style(sk, UDP))
844 sk->sk_state_change(sk);
845 }
846}
847
848/* Helper function to delete an association. */
849static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds,
850 struct sctp_association *asoc)
851{
852 struct sock *sk = asoc->base.sk;
853
854 /* If it is a non-temporary association belonging to a TCP-style
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900855 * listening socket that is not closed, do not free it so that accept()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 * can pick it up later.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900857 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) &&
859 (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK))
860 return;
861
862 sctp_unhash_established(asoc);
863 sctp_association_free(asoc);
864}
865
866/*
867 * ADDIP Section 4.1 ASCONF Chunk Procedures
868 * A4) Start a T-4 RTO timer, using the RTO value of the selected
869 * destination address (we use active path instead of primary path just
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900870 * because primary path may be inactive.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 */
872static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds,
873 struct sctp_association *asoc,
874 struct sctp_chunk *chunk)
875{
876 struct sctp_transport *t;
877
Wei Yongjun9919b452009-05-12 21:52:51 +0800878 t = sctp_assoc_choose_alter_transport(asoc, chunk->transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto;
880 chunk->transport = t;
881}
882
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900883/* Process an incoming Operation Error Chunk. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds,
885 struct sctp_association *asoc,
886 struct sctp_chunk *chunk)
887{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 struct sctp_errhdr *err_hdr;
Wei Yongjun3df26782009-03-02 06:46:51 +0000889 struct sctp_ulpevent *ev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890
Wei Yongjun3df26782009-03-02 06:46:51 +0000891 while (chunk->chunk_end > chunk->skb->data) {
892 err_hdr = (struct sctp_errhdr *)(chunk->skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893
Wei Yongjun3df26782009-03-02 06:46:51 +0000894 ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0,
895 GFP_ATOMIC);
896 if (!ev)
897 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
Wei Yongjun3df26782009-03-02 06:46:51 +0000899 sctp_ulpq_tail_event(&asoc->ulpq, ev);
900
901 switch (err_hdr->cause) {
902 case SCTP_ERROR_UNKNOWN_CHUNK:
903 {
904 sctp_chunkhdr_t *unk_chunk_hdr;
905
906 unk_chunk_hdr = (sctp_chunkhdr_t *)err_hdr->variable;
907 switch (unk_chunk_hdr->type) {
908 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with
909 * an ERROR chunk reporting that it did not recognized
910 * the ASCONF chunk type, the sender of the ASCONF MUST
911 * NOT send any further ASCONF chunks and MUST stop its
912 * T-4 timer.
913 */
914 case SCTP_CID_ASCONF:
915 if (asoc->peer.asconf_capable == 0)
916 break;
917
918 asoc->peer.asconf_capable = 0;
919 sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO));
Wei Yongjun3df26782009-03-02 06:46:51 +0000921 break;
922 default:
923 break;
924 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 break;
Wei Yongjun3df26782009-03-02 06:46:51 +0000926 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 default:
928 break;
929 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 }
931}
932
933/* Process variable FWDTSN chunk information. */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900934static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 struct sctp_chunk *chunk)
936{
937 struct sctp_fwdtsn_skip *skip;
938 /* Walk through all the skipped SSNs */
939 sctp_walk_fwdtsn(skip, chunk) {
940 sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn));
941 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942}
943
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900944/* Helper function to remove the association non-primary peer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 * transports.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900946 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947static void sctp_cmd_del_non_primary(struct sctp_association *asoc)
948{
949 struct sctp_transport *t;
950 struct list_head *pos;
951 struct list_head *temp;
952
953 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
954 t = list_entry(pos, struct sctp_transport, transports);
Al Viro5f242a12006-11-20 17:05:23 -0800955 if (!sctp_cmp_addr_exact(&t->ipaddr,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900956 &asoc->peer.primary_addr)) {
Al Viro38a03142006-11-20 17:06:45 -0800957 sctp_assoc_del_peer(asoc, &t->ipaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 }
959 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960}
961
Sridhar Samudrala8de8c872006-05-19 10:58:12 -0700962/* Helper function to set sk_err on a 1-1 style socket. */
963static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error)
964{
965 struct sock *sk = asoc->base.sk;
966
967 if (!sctp_style(sk, UDP))
968 sk->sk_err = error;
969}
970
Vlad Yasevich07d93962007-05-04 13:55:27 -0700971/* Helper function to generate an association change event */
972static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands,
973 struct sctp_association *asoc,
974 u8 state)
975{
976 struct sctp_ulpevent *ev;
977
978 ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0,
979 asoc->c.sinit_num_ostreams,
980 asoc->c.sinit_max_instreams,
981 NULL, GFP_ATOMIC);
982 if (ev)
983 sctp_ulpq_tail_event(&asoc->ulpq, ev);
984}
985
986/* Helper function to generate an adaptation indication event */
987static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands,
988 struct sctp_association *asoc)
989{
990 struct sctp_ulpevent *ev;
991
992 ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC);
993
994 if (ev)
995 sctp_ulpq_tail_event(&asoc->ulpq, ev);
996}
997
Vlad Yasevich96cd0d32008-09-08 14:00:26 -0400998
999static void sctp_cmd_t1_timer_update(struct sctp_association *asoc,
1000 sctp_event_timeout_t timer,
1001 char *name)
1002{
1003 struct sctp_transport *t;
1004
1005 t = asoc->init_last_sent_to;
1006 asoc->init_err_counter++;
1007
1008 if (t->init_sent_count > (asoc->init_cycle + 1)) {
1009 asoc->timeouts[timer] *= 2;
1010 if (asoc->timeouts[timer] > asoc->max_init_timeo) {
1011 asoc->timeouts[timer] = asoc->max_init_timeo;
1012 }
1013 asoc->init_cycle++;
Daniel Borkmannbb333812013-06-28 19:49:40 +02001014
1015 pr_debug("%s: T1[%s] timeout adjustment init_err_counter:%d"
1016 " cycle:%d timeout:%ld\n", __func__, name,
1017 asoc->init_err_counter, asoc->init_cycle,
1018 asoc->timeouts[timer]);
Vlad Yasevich96cd0d32008-09-08 14:00:26 -04001019 }
1020
1021}
1022
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -04001023/* Send the whole message, chunk by chunk, to the outqueue.
1024 * This way the whole message is queued up and bundling if
1025 * encouraged for small fragments.
1026 */
1027static int sctp_cmd_send_msg(struct sctp_association *asoc,
1028 struct sctp_datamsg *msg)
1029{
1030 struct sctp_chunk *chunk;
1031 int error = 0;
1032
1033 list_for_each_entry(chunk, &msg->chunks, frag_list) {
1034 error = sctp_outq_tail(&asoc->outqueue, chunk);
1035 if (error)
1036 break;
1037 }
1038
1039 return error;
1040}
1041
1042
Vlad Yasevichc0786692010-04-28 08:47:22 +00001043/* Sent the next ASCONF packet currently stored in the association.
1044 * This happens after the ASCONF_ACK was succeffully processed.
1045 */
1046static void sctp_cmd_send_asconf(struct sctp_association *asoc)
1047{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001048 struct net *net = sock_net(asoc->base.sk);
1049
Vlad Yasevichc0786692010-04-28 08:47:22 +00001050 /* Send the next asconf chunk from the addip chunk
1051 * queue.
1052 */
1053 if (!list_empty(&asoc->addip_chunk_list)) {
1054 struct list_head *entry = asoc->addip_chunk_list.next;
1055 struct sctp_chunk *asconf = list_entry(entry,
1056 struct sctp_chunk, list);
1057 list_del_init(entry);
1058
1059 /* Hold the chunk until an ASCONF_ACK is received. */
1060 sctp_chunk_hold(asconf);
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001061 if (sctp_primitive_ASCONF(net, asoc, asconf))
Vlad Yasevichc0786692010-04-28 08:47:22 +00001062 sctp_chunk_free(asconf);
1063 else
1064 asoc->addip_last_asconf = asconf;
1065 }
1066}
1067
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -04001068
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069/* These three macros allow us to pull the debugging code out of the
1070 * main flow of sctp_do_sm() to keep attention focused on the real
1071 * functionality there.
1072 */
Daniel Borkmannbb333812013-06-28 19:49:40 +02001073#define debug_pre_sfn() \
1074 pr_debug("%s[pre-fn]: ep:%p, %s, %s, asoc:%p[%s], %s\n", __func__, \
1075 ep, sctp_evttype_tbl[event_type], (*debug_fn)(subtype), \
1076 asoc, sctp_state_tbl[state], state_fn->name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077
Daniel Borkmannbb333812013-06-28 19:49:40 +02001078#define debug_post_sfn() \
1079 pr_debug("%s[post-fn]: asoc:%p, status:%s\n", __func__, asoc, \
1080 sctp_status_tbl[status])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081
Daniel Borkmannbb333812013-06-28 19:49:40 +02001082#define debug_post_sfx() \
1083 pr_debug("%s[post-sfx]: error:%d, asoc:%p[%s]\n", __func__, error, \
1084 asoc, sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
1085 sctp_assoc2id(asoc))) ? asoc->state : SCTP_STATE_CLOSED])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086
1087/*
1088 * This is the master state machine processing function.
1089 *
1090 * If you want to understand all of lksctp, this is a
1091 * good place to start.
1092 */
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001093int sctp_do_sm(struct net *net, sctp_event_t event_type, sctp_subtype_t subtype,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 sctp_state_t state,
1095 struct sctp_endpoint *ep,
1096 struct sctp_association *asoc,
1097 void *event_arg,
Al Virodd0fc662005-10-07 07:46:04 +01001098 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099{
1100 sctp_cmd_seq_t commands;
1101 const sctp_sm_table_entry_t *state_fn;
1102 sctp_disposition_t status;
1103 int error = 0;
1104 typedef const char *(printfn_t)(sctp_subtype_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105 static printfn_t *table[] = {
1106 NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname,
1107 };
1108 printfn_t *debug_fn __attribute__ ((unused)) = table[event_type];
1109
1110 /* Look up the state function, run it, and then process the
1111 * side effects. These three steps are the heart of lksctp.
1112 */
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001113 state_fn = sctp_sm_lookup_event(net, event_type, state, subtype);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114
1115 sctp_init_cmd_seq(&commands);
1116
Daniel Borkmannbb333812013-06-28 19:49:40 +02001117 debug_pre_sfn();
wangweidong131334d2013-12-18 17:18:55 +08001118 status = state_fn->fn(net, ep, asoc, subtype, event_arg, &commands);
Daniel Borkmannbb333812013-06-28 19:49:40 +02001119 debug_post_sfn();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120
1121 error = sctp_side_effects(event_type, subtype, state,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001122 ep, asoc, event_arg, status,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 &commands, gfp);
Daniel Borkmannbb333812013-06-28 19:49:40 +02001124 debug_post_sfx();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125
1126 return error;
1127}
1128
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129/*****************************************************************
1130 * This the master state function side effect processing function.
1131 *****************************************************************/
1132static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
1133 sctp_state_t state,
1134 struct sctp_endpoint *ep,
1135 struct sctp_association *asoc,
1136 void *event_arg,
1137 sctp_disposition_t status,
1138 sctp_cmd_seq_t *commands,
Al Virodd0fc662005-10-07 07:46:04 +01001139 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140{
1141 int error;
1142
1143 /* FIXME - Most of the dispositions left today would be categorized
1144 * as "exceptional" dispositions. For those dispositions, it
1145 * may not be proper to run through any of the commands at all.
1146 * For example, the command interpreter might be run only with
1147 * disposition SCTP_DISPOSITION_CONSUME.
1148 */
1149 if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state,
1150 ep, asoc,
1151 event_arg, status,
1152 commands, gfp)))
1153 goto bail;
1154
1155 switch (status) {
1156 case SCTP_DISPOSITION_DISCARD:
Daniel Borkmannbb333812013-06-28 19:49:40 +02001157 pr_debug("%s: ignored sctp protocol event - state:%d, "
1158 "event_type:%d, event_id:%d\n", __func__, state,
1159 event_type, subtype.chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 break;
1161
1162 case SCTP_DISPOSITION_NOMEM:
1163 /* We ran out of memory, so we need to discard this
1164 * packet.
1165 */
1166 /* BUG--we should now recover some memory, probably by
1167 * reneging...
1168 */
1169 error = -ENOMEM;
1170 break;
1171
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001172 case SCTP_DISPOSITION_DELETE_TCB:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 /* This should now be a command. */
1174 break;
1175
1176 case SCTP_DISPOSITION_CONSUME:
1177 case SCTP_DISPOSITION_ABORT:
1178 /*
1179 * We should no longer have much work to do here as the
1180 * real work has been done as explicit commands above.
1181 */
1182 break;
1183
1184 case SCTP_DISPOSITION_VIOLATION:
Joe Perchese87cc472012-05-13 21:56:26 +00001185 net_err_ratelimited("protocol violation state %d chunkid %d\n",
1186 state, subtype.chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 break;
1188
1189 case SCTP_DISPOSITION_NOT_IMPL:
Joe Perches145ce502010-08-24 13:21:08 +00001190 pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n",
1191 state, event_type, subtype.chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 break;
1193
1194 case SCTP_DISPOSITION_BUG:
Joe Perches145ce502010-08-24 13:21:08 +00001195 pr_err("bug in state %d, event_type %d, event_id %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 state, event_type, subtype.chunk);
1197 BUG();
1198 break;
1199
1200 default:
Joe Perches145ce502010-08-24 13:21:08 +00001201 pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 status, state, event_type, subtype.chunk);
1203 BUG();
1204 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001205 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206
1207bail:
1208 return error;
1209}
1210
1211/********************************************************************
1212 * 2nd Level Abstractions
1213 ********************************************************************/
1214
1215/* This is the side-effect interpreter. */
1216static int sctp_cmd_interpreter(sctp_event_t event_type,
1217 sctp_subtype_t subtype,
1218 sctp_state_t state,
1219 struct sctp_endpoint *ep,
1220 struct sctp_association *asoc,
1221 void *event_arg,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001222 sctp_disposition_t status,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 sctp_cmd_seq_t *commands,
Al Virodd0fc662005-10-07 07:46:04 +01001224 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225{
1226 int error = 0;
1227 int force;
1228 sctp_cmd_t *cmd;
1229 struct sctp_chunk *new_obj;
1230 struct sctp_chunk *chunk = NULL;
1231 struct sctp_packet *packet;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 struct timer_list *timer;
1233 unsigned long timeout;
1234 struct sctp_transport *t;
1235 struct sctp_sackhdr sackh;
1236 int local_cork = 0;
1237
1238 if (SCTP_EVENT_T_TIMEOUT != event_type)
Joe Perchesea110732011-06-13 16:21:26 +00001239 chunk = event_arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240
1241 /* Note: This whole file is a huge candidate for rework.
1242 * For example, each command could either have its own handler, so
1243 * the loop would look like:
1244 * while (cmds)
1245 * cmd->handle(x, y, z)
1246 * --jgrimm
1247 */
1248 while (NULL != (cmd = sctp_next_cmd(commands))) {
1249 switch (cmd->verb) {
1250 case SCTP_CMD_NOP:
1251 /* Do nothing. */
1252 break;
1253
1254 case SCTP_CMD_NEW_ASOC:
1255 /* Register a new association. */
1256 if (local_cork) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001257 sctp_outq_uncork(&asoc->outqueue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 local_cork = 0;
1259 }
Daniel Borkmannf9e42b82013-06-14 18:24:04 +02001260
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 /* Register with the endpoint. */
Daniel Borkmannf9e42b82013-06-14 18:24:04 +02001262 asoc = cmd->obj.asoc;
1263 BUG_ON(asoc->peer.primary_path == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 sctp_endpoint_add_asoc(ep, asoc);
1265 sctp_hash_established(asoc);
1266 break;
1267
1268 case SCTP_CMD_UPDATE_ASSOC:
Neil Hormanb26ddd82012-10-29 08:32:13 +00001269 sctp_assoc_update(asoc, cmd->obj.asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 break;
1271
1272 case SCTP_CMD_PURGE_OUTQUEUE:
1273 sctp_outq_teardown(&asoc->outqueue);
1274 break;
1275
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001276 case SCTP_CMD_DELETE_TCB:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 if (local_cork) {
1278 sctp_outq_uncork(&asoc->outqueue);
1279 local_cork = 0;
1280 }
1281 /* Delete the current association. */
1282 sctp_cmd_delete_tcb(commands, asoc);
1283 asoc = NULL;
1284 break;
1285
1286 case SCTP_CMD_NEW_STATE:
1287 /* Enter a new state. */
1288 sctp_cmd_new_state(commands, asoc, cmd->obj.state);
1289 break;
1290
1291 case SCTP_CMD_REPORT_TSN:
1292 /* Record the arrival of a TSN. */
Vlad Yasevich8e1ee182008-10-08 14:18:39 -07001293 error = sctp_tsnmap_mark(&asoc->peer.tsn_map,
Neil Horman42448542012-06-30 03:04:26 +00001294 cmd->obj.u32, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 break;
1296
1297 case SCTP_CMD_REPORT_FWDTSN:
1298 /* Move the Cumulattive TSN Ack ahead. */
1299 sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32);
1300
Vlad Yasevichea2dfb32007-07-13 17:01:19 -04001301 /* purge the fragmentation queue */
1302 sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32);
1303
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 /* Abort any in progress partial delivery. */
1305 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
1306 break;
1307
1308 case SCTP_CMD_PROCESS_FWDTSN:
Neil Hormanb26ddd82012-10-29 08:32:13 +00001309 sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.chunk);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001310 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311
1312 case SCTP_CMD_GEN_SACK:
1313 /* Generate a Selective ACK.
1314 * The argument tells us whether to just count
1315 * the packet and MAYBE generate a SACK, or
1316 * force a SACK out.
1317 */
1318 force = cmd->obj.i32;
1319 error = sctp_gen_sack(asoc, force, commands);
1320 break;
1321
1322 case SCTP_CMD_PROCESS_SACK:
1323 /* Process an inbound SACK. */
1324 error = sctp_cmd_process_sack(commands, asoc,
Neil Hormanb26ddd82012-10-29 08:32:13 +00001325 cmd->obj.chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 break;
1327
1328 case SCTP_CMD_GEN_INIT_ACK:
1329 /* Generate an INIT ACK chunk. */
1330 new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC,
1331 0);
1332 if (!new_obj)
1333 goto nomem;
1334
1335 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1336 SCTP_CHUNK(new_obj));
1337 break;
1338
1339 case SCTP_CMD_PEER_INIT:
1340 /* Process a unified INIT from the peer.
1341 * Note: Only used during INIT-ACK processing. If
1342 * there is an error just return to the outter
1343 * layer which will bail.
1344 */
1345 error = sctp_cmd_process_init(commands, asoc, chunk,
Neil Hormanb26ddd82012-10-29 08:32:13 +00001346 cmd->obj.init, gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 break;
1348
1349 case SCTP_CMD_GEN_COOKIE_ECHO:
1350 /* Generate a COOKIE ECHO chunk. */
1351 new_obj = sctp_make_cookie_echo(asoc, chunk);
1352 if (!new_obj) {
Neil Hormanb26ddd82012-10-29 08:32:13 +00001353 if (cmd->obj.chunk)
1354 sctp_chunk_free(cmd->obj.chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 goto nomem;
1356 }
1357 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1358 SCTP_CHUNK(new_obj));
1359
1360 /* If there is an ERROR chunk to be sent along with
1361 * the COOKIE_ECHO, send it, too.
1362 */
Neil Hormanb26ddd82012-10-29 08:32:13 +00001363 if (cmd->obj.chunk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
Neil Hormanb26ddd82012-10-29 08:32:13 +00001365 SCTP_CHUNK(cmd->obj.chunk));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366
Vlad Yasevich96cd0d32008-09-08 14:00:26 -04001367 if (new_obj->transport) {
1368 new_obj->transport->init_sent_count++;
1369 asoc->init_last_sent_to = new_obj->transport;
1370 }
1371
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 /* FIXME - Eventually come up with a cleaner way to
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001373 * enabling COOKIE-ECHO + DATA bundling during
1374 * multihoming stale cookie scenarios, the following
1375 * command plays with asoc->peer.retran_path to
1376 * avoid the problem of sending the COOKIE-ECHO and
1377 * DATA in different paths, which could result
1378 * in the association being ABORTed if the DATA chunk
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 * is processed first by the server. Checking the
1380 * init error counter simply causes this command
1381 * to be executed only during failed attempts of
1382 * association establishment.
1383 */
Frank Filz3f7a87d2005-06-20 13:14:57 -07001384 if ((asoc->peer.retran_path !=
1385 asoc->peer.primary_path) &&
1386 (asoc->init_err_counter > 0)) {
1387 sctp_add_cmd_sf(commands,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001388 SCTP_CMD_FORCE_PRIM_RETRAN,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389 SCTP_NULL());
1390 }
1391
1392 break;
1393
1394 case SCTP_CMD_GEN_SHUTDOWN:
1395 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1396 * Reset error counts.
1397 */
1398 asoc->overall_error_count = 0;
1399
1400 /* Generate a SHUTDOWN chunk. */
1401 new_obj = sctp_make_shutdown(asoc, chunk);
1402 if (!new_obj)
1403 goto nomem;
1404 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1405 SCTP_CHUNK(new_obj));
1406 break;
1407
1408 case SCTP_CMD_CHUNK_ULP:
1409 /* Send a chunk to the sockets layer. */
Daniel Borkmannbb333812013-06-28 19:49:40 +02001410 pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n",
1411 __func__, cmd->obj.chunk, &asoc->ulpq);
1412
Neil Hormanb26ddd82012-10-29 08:32:13 +00001413 sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.chunk,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 GFP_ATOMIC);
1415 break;
1416
1417 case SCTP_CMD_EVENT_ULP:
1418 /* Send a notification to the sockets layer. */
Daniel Borkmannbb333812013-06-28 19:49:40 +02001419 pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n",
1420 __func__, cmd->obj.ulpevent, &asoc->ulpq);
1421
Neil Hormanb26ddd82012-10-29 08:32:13 +00001422 sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ulpevent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 break;
1424
1425 case SCTP_CMD_REPLY:
1426 /* If an caller has not already corked, do cork. */
1427 if (!asoc->outqueue.cork) {
1428 sctp_outq_cork(&asoc->outqueue);
1429 local_cork = 1;
1430 }
1431 /* Send a chunk to our peer. */
Neil Hormanb26ddd82012-10-29 08:32:13 +00001432 error = sctp_outq_tail(&asoc->outqueue, cmd->obj.chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 break;
1434
1435 case SCTP_CMD_SEND_PKT:
1436 /* Send a full packet to our peer. */
Neil Hormanb26ddd82012-10-29 08:32:13 +00001437 packet = cmd->obj.packet;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438 sctp_packet_transmit(packet);
1439 sctp_ootb_pkt_free(packet);
1440 break;
1441
Vlad Yasevichb6157d82007-10-24 15:59:16 -04001442 case SCTP_CMD_T1_RETRAN:
1443 /* Mark a transport for retransmission. */
1444 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1445 SCTP_RTXR_T1_RTX);
1446 break;
1447
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448 case SCTP_CMD_RETRAN:
1449 /* Mark a transport for retransmission. */
1450 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1451 SCTP_RTXR_T3_RTX);
1452 break;
1453
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454 case SCTP_CMD_ECN_CE:
1455 /* Do delayed CE processing. */
1456 sctp_do_ecn_ce_work(asoc, cmd->obj.u32);
1457 break;
1458
1459 case SCTP_CMD_ECN_ECNE:
1460 /* Do delayed ECNE processing. */
1461 new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32,
1462 chunk);
1463 if (new_obj)
1464 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1465 SCTP_CHUNK(new_obj));
1466 break;
1467
1468 case SCTP_CMD_ECN_CWR:
1469 /* Do delayed CWR processing. */
1470 sctp_do_ecn_cwr_work(asoc, cmd->obj.u32);
1471 break;
1472
1473 case SCTP_CMD_SETUP_T2:
Neil Hormanb26ddd82012-10-29 08:32:13 +00001474 sctp_cmd_setup_t2(commands, asoc, cmd->obj.chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475 break;
1476
Thomas Graff8d96052011-07-07 00:28:35 +00001477 case SCTP_CMD_TIMER_START_ONCE:
1478 timer = &asoc->timers[cmd->obj.to];
1479
1480 if (timer_pending(timer))
1481 break;
1482 /* fall through */
1483
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484 case SCTP_CMD_TIMER_START:
1485 timer = &asoc->timers[cmd->obj.to];
1486 timeout = asoc->timeouts[cmd->obj.to];
Kris Katterjohn09a62662006-01-08 22:24:28 -08001487 BUG_ON(!timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488
1489 timer->expires = jiffies + timeout;
1490 sctp_association_hold(asoc);
1491 add_timer(timer);
1492 break;
1493
1494 case SCTP_CMD_TIMER_RESTART:
1495 timer = &asoc->timers[cmd->obj.to];
1496 timeout = asoc->timeouts[cmd->obj.to];
1497 if (!mod_timer(timer, jiffies + timeout))
1498 sctp_association_hold(asoc);
1499 break;
1500
1501 case SCTP_CMD_TIMER_STOP:
1502 timer = &asoc->timers[cmd->obj.to];
Ying Xue25cc4ae2013-02-03 20:32:57 +00001503 if (del_timer(timer))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 sctp_association_put(asoc);
1505 break;
1506
Frank Filz3f7a87d2005-06-20 13:14:57 -07001507 case SCTP_CMD_INIT_CHOOSE_TRANSPORT:
Neil Hormanb26ddd82012-10-29 08:32:13 +00001508 chunk = cmd->obj.chunk;
Wei Yongjun9919b452009-05-12 21:52:51 +08001509 t = sctp_assoc_choose_alter_transport(asoc,
1510 asoc->init_last_sent_to);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001511 asoc->init_last_sent_to = t;
1512 chunk->transport = t;
1513 t->init_sent_count++;
Vlad Yaseviche0e9db12009-11-23 15:53:57 -05001514 /* Set the new transport as primary */
1515 sctp_assoc_set_primary(asoc, t);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001516 break;
1517
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518 case SCTP_CMD_INIT_RESTART:
1519 /* Do the needed accounting and updates
1520 * associated with restarting an initialization
Frank Filz3f7a87d2005-06-20 13:14:57 -07001521 * timer. Only multiply the timeout by two if
1522 * all transports have been tried at the current
1523 * timeout.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524 */
Vlad Yasevich96cd0d32008-09-08 14:00:26 -04001525 sctp_cmd_t1_timer_update(asoc,
1526 SCTP_EVENT_TIMEOUT_T1_INIT,
1527 "INIT");
Frank Filz3f7a87d2005-06-20 13:14:57 -07001528
1529 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
1530 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
1531 break;
1532
1533 case SCTP_CMD_COOKIEECHO_RESTART:
1534 /* Do the needed accounting and updates
1535 * associated with restarting an initialization
1536 * timer. Only multiply the timeout by two if
1537 * all transports have been tried at the current
1538 * timeout.
1539 */
Vlad Yasevich96cd0d32008-09-08 14:00:26 -04001540 sctp_cmd_t1_timer_update(asoc,
1541 SCTP_EVENT_TIMEOUT_T1_COOKIE,
1542 "COOKIE");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543
1544 /* If we've sent any data bundled with
1545 * COOKIE-ECHO we need to resend.
1546 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07001547 list_for_each_entry(t, &asoc->peer.transport_addr_list,
1548 transports) {
Vlad Yasevichb6157d82007-10-24 15:59:16 -04001549 sctp_retransmit_mark(&asoc->outqueue, t,
1550 SCTP_RTXR_T1_RTX);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551 }
1552
1553 sctp_add_cmd_sf(commands,
1554 SCTP_CMD_TIMER_RESTART,
Frank Filz3f7a87d2005-06-20 13:14:57 -07001555 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556 break;
1557
1558 case SCTP_CMD_INIT_FAILED:
Al Virodc251b22006-11-20 17:00:44 -08001559 sctp_cmd_init_failed(commands, asoc, cmd->obj.err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560 break;
1561
1562 case SCTP_CMD_ASSOC_FAILED:
1563 sctp_cmd_assoc_failed(commands, asoc, event_type,
Al Viro5be291f2006-11-20 17:01:06 -08001564 subtype, chunk, cmd->obj.err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565 break;
1566
Frank Filz3f7a87d2005-06-20 13:14:57 -07001567 case SCTP_CMD_INIT_COUNTER_INC:
1568 asoc->init_err_counter++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 break;
1570
Frank Filz3f7a87d2005-06-20 13:14:57 -07001571 case SCTP_CMD_INIT_COUNTER_RESET:
1572 asoc->init_err_counter = 0;
1573 asoc->init_cycle = 0;
Vlad Yasevich96cd0d32008-09-08 14:00:26 -04001574 list_for_each_entry(t, &asoc->peer.transport_addr_list,
1575 transports) {
1576 t->init_sent_count = 0;
1577 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578 break;
1579
1580 case SCTP_CMD_REPORT_DUP:
1581 sctp_tsnmap_mark_dup(&asoc->peer.tsn_map,
1582 cmd->obj.u32);
1583 break;
1584
1585 case SCTP_CMD_REPORT_BAD_TAG:
Daniel Borkmannbb333812013-06-28 19:49:40 +02001586 pr_debug("%s: vtag mismatch!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587 break;
1588
1589 case SCTP_CMD_STRIKE:
1590 /* Mark one strike against a transport. */
Neil Horman5aa93bc2012-07-21 07:56:07 +00001591 sctp_do_8_2_transport_strike(commands, asoc,
1592 cmd->obj.transport, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593 break;
1594
Vlad Yasevich7e990132009-03-02 09:46:14 +00001595 case SCTP_CMD_TRANSPORT_IDLE:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596 t = cmd->obj.transport;
Vlad Yasevich7e990132009-03-02 09:46:14 +00001597 sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE);
1598 break;
1599
1600 case SCTP_CMD_TRANSPORT_HB_SENT:
1601 t = cmd->obj.transport;
Neil Horman5aa93bc2012-07-21 07:56:07 +00001602 sctp_do_8_2_transport_strike(commands, asoc,
1603 t, 1);
Vlad Yasevich7e990132009-03-02 09:46:14 +00001604 t->hb_sent = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605 break;
1606
1607 case SCTP_CMD_TRANSPORT_ON:
1608 t = cmd->obj.transport;
1609 sctp_cmd_transport_on(commands, asoc, t, chunk);
1610 break;
1611
1612 case SCTP_CMD_HB_TIMERS_START:
1613 sctp_cmd_hb_timers_start(commands, asoc);
1614 break;
1615
1616 case SCTP_CMD_HB_TIMER_UPDATE:
1617 t = cmd->obj.transport;
Gui Jianfeng765ff022008-04-12 18:55:12 -07001618 sctp_cmd_hb_timer_update(commands, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619 break;
1620
1621 case SCTP_CMD_HB_TIMERS_STOP:
1622 sctp_cmd_hb_timers_stop(commands, asoc);
1623 break;
1624
1625 case SCTP_CMD_REPORT_ERROR:
1626 error = cmd->obj.error;
1627 break;
1628
1629 case SCTP_CMD_PROCESS_CTSN:
1630 /* Dummy up a SACK for processing. */
Al Viro2178eda2006-11-20 17:26:53 -08001631 sackh.cum_tsn_ack = cmd->obj.be32;
Vlad Yasevichd4d6fb52009-09-04 18:20:59 -04001632 sackh.a_rwnd = asoc->peer.rwnd +
1633 asoc->outqueue.outstanding_bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634 sackh.num_gap_ack_blocks = 0;
1635 sackh.num_dup_tsns = 0;
Zijie Panf6e80ab2012-10-15 03:56:39 +00001636 chunk->subh.sack_hdr = &sackh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637 sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK,
Zijie Panf6e80ab2012-10-15 03:56:39 +00001638 SCTP_CHUNK(chunk));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639 break;
1640
1641 case SCTP_CMD_DISCARD_PACKET:
Vlad Yasevich2e3216c2008-06-19 16:08:18 -07001642 /* We need to discard the whole packet.
1643 * Uncork the queue since there might be
1644 * responses pending
1645 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 chunk->pdiscard = 1;
Vlad Yasevich2e3216c2008-06-19 16:08:18 -07001647 if (asoc) {
1648 sctp_outq_uncork(&asoc->outqueue);
1649 local_cork = 0;
1650 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651 break;
1652
1653 case SCTP_CMD_RTO_PENDING:
1654 t = cmd->obj.transport;
1655 t->rto_pending = 1;
1656 break;
1657
1658 case SCTP_CMD_PART_DELIVER:
Neil Hormanb26ddd82012-10-29 08:32:13 +00001659 sctp_ulpq_partial_delivery(&asoc->ulpq, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660 break;
1661
1662 case SCTP_CMD_RENEGE:
Neil Hormanb26ddd82012-10-29 08:32:13 +00001663 sctp_ulpq_renege(&asoc->ulpq, cmd->obj.chunk,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001664 GFP_ATOMIC);
1665 break;
1666
1667 case SCTP_CMD_SETUP_T4:
Neil Hormanb26ddd82012-10-29 08:32:13 +00001668 sctp_cmd_setup_t4(commands, asoc, cmd->obj.chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669 break;
1670
1671 case SCTP_CMD_PROCESS_OPERR:
1672 sctp_cmd_process_operr(commands, asoc, chunk);
1673 break;
1674 case SCTP_CMD_CLEAR_INIT_TAG:
1675 asoc->peer.i.init_tag = 0;
1676 break;
1677 case SCTP_CMD_DEL_NON_PRIMARY:
1678 sctp_cmd_del_non_primary(asoc);
1679 break;
1680 case SCTP_CMD_T3_RTX_TIMERS_STOP:
1681 sctp_cmd_t3_rtx_timers_stop(commands, asoc);
1682 break;
1683 case SCTP_CMD_FORCE_PRIM_RETRAN:
1684 t = asoc->peer.retran_path;
1685 asoc->peer.retran_path = asoc->peer.primary_path;
1686 error = sctp_outq_uncork(&asoc->outqueue);
1687 local_cork = 0;
1688 asoc->peer.retran_path = t;
1689 break;
Sridhar Samudrala8de8c872006-05-19 10:58:12 -07001690 case SCTP_CMD_SET_SK_ERR:
1691 sctp_cmd_set_sk_err(asoc, cmd->obj.error);
1692 break;
Vlad Yasevich07d93962007-05-04 13:55:27 -07001693 case SCTP_CMD_ASSOC_CHANGE:
1694 sctp_cmd_assoc_change(commands, asoc,
1695 cmd->obj.u8);
1696 break;
1697 case SCTP_CMD_ADAPTATION_IND:
1698 sctp_cmd_adaptation_ind(commands, asoc);
1699 break;
1700
Vlad Yasevich730fc3d2007-09-16 19:32:11 -07001701 case SCTP_CMD_ASSOC_SHKEY:
1702 error = sctp_auth_asoc_init_active_key(asoc,
1703 GFP_ATOMIC);
1704 break;
Gui Jianfengf4ad85c2008-04-12 18:39:34 -07001705 case SCTP_CMD_UPDATE_INITTAG:
1706 asoc->peer.i.init_tag = cmd->obj.u32;
1707 break;
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -04001708 case SCTP_CMD_SEND_MSG:
1709 if (!asoc->outqueue.cork) {
1710 sctp_outq_cork(&asoc->outqueue);
1711 local_cork = 1;
1712 }
1713 error = sctp_cmd_send_msg(asoc, cmd->obj.msg);
1714 break;
Vlad Yasevichc0786692010-04-28 08:47:22 +00001715 case SCTP_CMD_SEND_NEXT_ASCONF:
1716 sctp_cmd_send_asconf(asoc);
1717 break;
Wei Yongjuna000c012011-05-29 23:23:36 +00001718 case SCTP_CMD_PURGE_ASCONF_QUEUE:
1719 sctp_asconf_queue_teardown(asoc);
1720 break;
Max Matveevd5ccd492011-08-29 21:02:24 +00001721
1722 case SCTP_CMD_SET_ASOC:
1723 asoc = cmd->obj.asoc;
1724 break;
1725
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726 default:
Neil Hormanb26ddd82012-10-29 08:32:13 +00001727 pr_warn("Impossible command: %u\n",
1728 cmd->verb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001730 }
1731
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732 if (error)
1733 break;
1734 }
1735
1736out:
Vlad Yasevich2e3216c2008-06-19 16:08:18 -07001737 /* If this is in response to a received chunk, wait until
1738 * we are done with the packet to open the queue so that we don't
1739 * send multiple packets in response to a single request.
1740 */
1741 if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) {
1742 if (chunk->end_of_packet || chunk->singleton)
Vlad Yasevichd4d6fb52009-09-04 18:20:59 -04001743 error = sctp_outq_uncork(&asoc->outqueue);
Vlad Yasevich2e3216c2008-06-19 16:08:18 -07001744 } else if (local_cork)
Vlad Yasevichd4d6fb52009-09-04 18:20:59 -04001745 error = sctp_outq_uncork(&asoc->outqueue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746 return error;
1747nomem:
1748 error = -ENOMEM;
1749 goto out;
1750}
1751