Commit | Line | Data |
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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * (C) Copyright IBM Corp. 2001, 2004 |
3 | * Copyright (c) 1999 Cisco, Inc. | |
4 | * Copyright (c) 1999-2001 Motorola, Inc. | |
5 | * | |
60c778b2 | 6 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
7 | * |
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 | * | |
60c778b2 | 12 | * This SCTP implementation is free software; |
1da177e4 LT |
13 | * 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 | * | |
60c778b2 | 18 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
19 | * 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 | |
4b2f13a2 JK |
25 | * along with GNU CC; see the file COPYING. If not, see |
26 | * <http://www.gnu.org/licenses/>. | |
1da177e4 LT |
27 | * |
28 | * Please send any bug reports or fixes you make to the | |
29 | * email address(es): | |
91705c61 | 30 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 31 | * |
1da177e4 LT |
32 | * 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> | |
1da177e4 LT |
41 | */ |
42 | ||
145ce502 JP |
43 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
44 | ||
1da177e4 LT |
45 | #include <linux/skbuff.h> |
46 | #include <linux/types.h> | |
47 | #include <linux/socket.h> | |
48 | #include <linux/ip.h> | |
5a0e3ad6 | 49 | #include <linux/gfp.h> |
1da177e4 LT |
50 | #include <net/sock.h> |
51 | #include <net/sctp/sctp.h> | |
52 | #include <net/sctp/sm.h> | |
53 | ||
54 | static 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, | |
d808ad9a | 60 | sctp_disposition_t status, |
1da177e4 | 61 | sctp_cmd_seq_t *commands, |
dd0fc66f | 62 | gfp_t gfp); |
1da177e4 LT |
63 | static 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, | |
dd0fc66f | 70 | gfp_t gfp); |
1da177e4 | 71 | |
5aa93bcf NH |
72 | static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds, |
73 | struct sctp_transport *t); | |
1da177e4 LT |
74 | /******************************************************************** |
75 | * Helper functions | |
76 | ********************************************************************/ | |
77 | ||
78 | /* A helper function for delayed processing of INET ECN CE bit. */ | |
d808ad9a | 79 | static void sctp_do_ecn_ce_work(struct sctp_association *asoc, |
1da177e4 LT |
80 | __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 | */ | |
100 | static 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. */ | |
143 | static 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. */ | |
153 | static 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; | |
52ccb8e9 | 158 | struct sctp_transport *trans = asoc->peer.last_data_from; |
1da177e4 LT |
159 | int error = 0; |
160 | ||
d808ad9a | 161 | if (force || |
52ccb8e9 FF |
162 | (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) || |
163 | (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE))) | |
1da177e4 LT |
164 | 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 | */ | |
d808ad9a | 179 | if (max_tsn_seen != ctsn) |
1da177e4 LT |
180 | 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) { | |
d364d927 | 191 | asoc->peer.sack_cnt++; |
52ccb8e9 FF |
192 | |
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 | */ | |
d364d927 WY |
198 | 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 | ||
d808ad9a | 203 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
52ccb8e9 | 204 | trans->sackdelay; |
d364d927 WY |
205 | } 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 | ||
d808ad9a | 210 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
52ccb8e9 | 211 | asoc->sackdelay; |
d364d927 | 212 | } |
52ccb8e9 FF |
213 | |
214 | /* Restart the SACK timer. */ | |
215 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
216 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
1da177e4 | 217 | } else { |
90f2f531 | 218 | asoc->a_rwnd = asoc->rwnd; |
1da177e4 LT |
219 | sack = sctp_make_sack(asoc); |
220 | if (!sack) | |
221 | goto nomem; | |
222 | ||
223 | asoc->peer.sack_needed = 0; | |
d364d927 | 224 | asoc->peer.sack_cnt = 0; |
1da177e4 | 225 | |
732ba35e | 226 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack)); |
1da177e4 LT |
227 | |
228 | /* Stop the SACK timer. */ | |
229 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
230 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
231 | } | |
52ccb8e9 | 232 | |
1da177e4 LT |
233 | return error; |
234 | nomem: | |
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 | */ | |
242 | void 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; | |
635682a1 KH |
247 | struct sock *sk = asoc->base.sk; |
248 | struct net *net = sock_net(sk); | |
1da177e4 LT |
249 | |
250 | /* Check whether a task is in the sock. */ | |
251 | ||
635682a1 KH |
252 | bh_lock_sock(sk); |
253 | if (sock_owned_by_user(sk)) { | |
bb33381d | 254 | pr_debug("%s: sock is busy\n", __func__); |
1da177e4 LT |
255 | |
256 | /* Try again later. */ | |
257 | if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20))) | |
258 | sctp_transport_hold(transport); | |
259 | goto out_unlock; | |
260 | } | |
261 | ||
262 | /* Is this transport really dead and just waiting around for | |
263 | * the timer to let go of the reference? | |
264 | */ | |
265 | if (transport->dead) | |
266 | goto out_unlock; | |
267 | ||
268 | /* Run through the state machine. */ | |
55e26eb9 | 269 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
270 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX), |
271 | asoc->state, | |
272 | asoc->ep, asoc, | |
273 | transport, GFP_ATOMIC); | |
274 | ||
275 | if (error) | |
635682a1 | 276 | sk->sk_err = -error; |
1da177e4 LT |
277 | |
278 | out_unlock: | |
635682a1 | 279 | bh_unlock_sock(sk); |
1da177e4 LT |
280 | sctp_transport_put(transport); |
281 | } | |
282 | ||
283 | /* This is a sa interface for producing timeout events. It works | |
284 | * for timeouts which use the association as their parameter. | |
285 | */ | |
286 | static void sctp_generate_timeout_event(struct sctp_association *asoc, | |
287 | sctp_event_timeout_t timeout_type) | |
288 | { | |
635682a1 KH |
289 | struct sock *sk = asoc->base.sk; |
290 | struct net *net = sock_net(sk); | |
1da177e4 LT |
291 | int error = 0; |
292 | ||
635682a1 KH |
293 | bh_lock_sock(sk); |
294 | if (sock_owned_by_user(sk)) { | |
bb33381d DB |
295 | pr_debug("%s: sock is busy: timer %d\n", __func__, |
296 | timeout_type); | |
1da177e4 LT |
297 | |
298 | /* Try again later. */ | |
299 | if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20))) | |
300 | sctp_association_hold(asoc); | |
301 | goto out_unlock; | |
302 | } | |
303 | ||
304 | /* Is this association really dead and just waiting around for | |
305 | * the timer to let go of the reference? | |
306 | */ | |
307 | if (asoc->base.dead) | |
308 | goto out_unlock; | |
309 | ||
310 | /* Run through the state machine. */ | |
55e26eb9 | 311 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
312 | SCTP_ST_TIMEOUT(timeout_type), |
313 | asoc->state, asoc->ep, asoc, | |
314 | (void *)timeout_type, GFP_ATOMIC); | |
315 | ||
316 | if (error) | |
635682a1 | 317 | sk->sk_err = -error; |
1da177e4 LT |
318 | |
319 | out_unlock: | |
635682a1 | 320 | bh_unlock_sock(sk); |
1da177e4 LT |
321 | sctp_association_put(asoc); |
322 | } | |
323 | ||
324 | static void sctp_generate_t1_cookie_event(unsigned long data) | |
325 | { | |
326 | struct sctp_association *asoc = (struct sctp_association *) data; | |
327 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE); | |
328 | } | |
329 | ||
330 | static void sctp_generate_t1_init_event(unsigned long data) | |
331 | { | |
332 | struct sctp_association *asoc = (struct sctp_association *) data; | |
333 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT); | |
334 | } | |
335 | ||
336 | static void sctp_generate_t2_shutdown_event(unsigned long data) | |
337 | { | |
338 | struct sctp_association *asoc = (struct sctp_association *) data; | |
339 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN); | |
340 | } | |
341 | ||
342 | static void sctp_generate_t4_rto_event(unsigned long data) | |
343 | { | |
344 | struct sctp_association *asoc = (struct sctp_association *) data; | |
345 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO); | |
346 | } | |
347 | ||
348 | static void sctp_generate_t5_shutdown_guard_event(unsigned long data) | |
349 | { | |
d808ad9a YH |
350 | struct sctp_association *asoc = (struct sctp_association *)data; |
351 | sctp_generate_timeout_event(asoc, | |
1da177e4 LT |
352 | SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD); |
353 | ||
354 | } /* sctp_generate_t5_shutdown_guard_event() */ | |
355 | ||
356 | static void sctp_generate_autoclose_event(unsigned long data) | |
357 | { | |
358 | struct sctp_association *asoc = (struct sctp_association *) data; | |
359 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE); | |
360 | } | |
361 | ||
362 | /* Generate a heart beat event. If the sock is busy, reschedule. Make | |
363 | * sure that the transport is still valid. | |
364 | */ | |
365 | void sctp_generate_heartbeat_event(unsigned long data) | |
366 | { | |
367 | int error = 0; | |
368 | struct sctp_transport *transport = (struct sctp_transport *) data; | |
369 | struct sctp_association *asoc = transport->asoc; | |
635682a1 KH |
370 | struct sock *sk = asoc->base.sk; |
371 | struct net *net = sock_net(sk); | |
1da177e4 | 372 | |
635682a1 KH |
373 | bh_lock_sock(sk); |
374 | if (sock_owned_by_user(sk)) { | |
bb33381d | 375 | pr_debug("%s: sock is busy\n", __func__); |
1da177e4 LT |
376 | |
377 | /* Try again later. */ | |
378 | if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20))) | |
379 | sctp_transport_hold(transport); | |
380 | goto out_unlock; | |
381 | } | |
382 | ||
383 | /* Is this structure just waiting around for us to actually | |
384 | * get destroyed? | |
385 | */ | |
386 | if (transport->dead) | |
387 | goto out_unlock; | |
388 | ||
55e26eb9 | 389 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
390 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT), |
391 | asoc->state, asoc->ep, asoc, | |
392 | transport, GFP_ATOMIC); | |
393 | ||
f05940e6 | 394 | if (error) |
635682a1 | 395 | sk->sk_err = -error; |
1da177e4 LT |
396 | |
397 | out_unlock: | |
635682a1 | 398 | bh_unlock_sock(sk); |
1da177e4 LT |
399 | sctp_transport_put(transport); |
400 | } | |
401 | ||
50b5d6ad VY |
402 | /* Handle the timeout of the ICMP protocol unreachable timer. Trigger |
403 | * the correct state machine transition that will close the association. | |
404 | */ | |
405 | void sctp_generate_proto_unreach_event(unsigned long data) | |
406 | { | |
407 | struct sctp_transport *transport = (struct sctp_transport *) data; | |
408 | struct sctp_association *asoc = transport->asoc; | |
635682a1 KH |
409 | struct sock *sk = asoc->base.sk; |
410 | struct net *net = sock_net(sk); | |
cb3f837b | 411 | |
635682a1 KH |
412 | bh_lock_sock(sk); |
413 | if (sock_owned_by_user(sk)) { | |
bb33381d | 414 | pr_debug("%s: sock is busy\n", __func__); |
50b5d6ad VY |
415 | |
416 | /* Try again later. */ | |
417 | if (!mod_timer(&transport->proto_unreach_timer, | |
418 | jiffies + (HZ/20))) | |
419 | sctp_association_hold(asoc); | |
420 | goto out_unlock; | |
421 | } | |
422 | ||
423 | /* Is this structure just waiting around for us to actually | |
424 | * get destroyed? | |
425 | */ | |
426 | if (asoc->base.dead) | |
427 | goto out_unlock; | |
428 | ||
55e26eb9 | 429 | sctp_do_sm(net, SCTP_EVENT_T_OTHER, |
50b5d6ad VY |
430 | SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH), |
431 | asoc->state, asoc->ep, asoc, transport, GFP_ATOMIC); | |
432 | ||
433 | out_unlock: | |
635682a1 | 434 | bh_unlock_sock(sk); |
50b5d6ad VY |
435 | sctp_association_put(asoc); |
436 | } | |
437 | ||
438 | ||
1da177e4 LT |
439 | /* Inject a SACK Timeout event into the state machine. */ |
440 | static void sctp_generate_sack_event(unsigned long data) | |
441 | { | |
442 | struct sctp_association *asoc = (struct sctp_association *) data; | |
443 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK); | |
444 | } | |
445 | ||
446 | sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = { | |
447 | NULL, | |
448 | sctp_generate_t1_cookie_event, | |
449 | sctp_generate_t1_init_event, | |
450 | sctp_generate_t2_shutdown_event, | |
451 | NULL, | |
452 | sctp_generate_t4_rto_event, | |
453 | sctp_generate_t5_shutdown_guard_event, | |
1e7d3d90 | 454 | NULL, |
1da177e4 LT |
455 | sctp_generate_sack_event, |
456 | sctp_generate_autoclose_event, | |
457 | }; | |
458 | ||
459 | ||
460 | /* RFC 2960 8.2 Path Failure Detection | |
461 | * | |
462 | * When its peer endpoint is multi-homed, an endpoint should keep a | |
463 | * error counter for each of the destination transport addresses of the | |
464 | * peer endpoint. | |
465 | * | |
466 | * Each time the T3-rtx timer expires on any address, or when a | |
467 | * HEARTBEAT sent to an idle address is not acknowledged within a RTO, | |
468 | * the error counter of that destination address will be incremented. | |
469 | * When the value in the error counter exceeds the protocol parameter | |
470 | * 'Path.Max.Retrans' of that destination address, the endpoint should | |
471 | * mark the destination transport address as inactive, and a | |
472 | * notification SHOULD be sent to the upper layer. | |
473 | * | |
474 | */ | |
5aa93bcf NH |
475 | static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t *commands, |
476 | struct sctp_association *asoc, | |
7e99013a VY |
477 | struct sctp_transport *transport, |
478 | int is_hb) | |
1da177e4 LT |
479 | { |
480 | /* The check for association's overall error counter exceeding the | |
481 | * threshold is done in the state function. | |
482 | */ | |
b9f84786 VY |
483 | /* We are here due to a timer expiration. If the timer was |
484 | * not a HEARTBEAT, then normal error tracking is done. | |
485 | * If the timer was a heartbeat, we only increment error counts | |
486 | * when we already have an outstanding HEARTBEAT that has not | |
487 | * been acknowledged. | |
25985edc | 488 | * Additionally, some tranport states inhibit error increments. |
ad8fec17 | 489 | */ |
b9f84786 | 490 | if (!is_hb) { |
ad8fec17 | 491 | asoc->overall_error_count++; |
b9f84786 VY |
492 | if (transport->state != SCTP_INACTIVE) |
493 | transport->error_count++; | |
494 | } else if (transport->hb_sent) { | |
495 | if (transport->state != SCTP_UNCONFIRMED) | |
496 | asoc->overall_error_count++; | |
497 | if (transport->state != SCTP_INACTIVE) | |
498 | transport->error_count++; | |
499 | } | |
1da177e4 | 500 | |
5aa93bcf | 501 | /* If the transport error count is greater than the pf_retrans |
7cce3b75 | 502 | * threshold, and less than pathmaxrtx, and if the current state |
8c2eab90 KH |
503 | * is SCTP_ACTIVE, then mark this transport as Partially Failed, |
504 | * see SCTP Quick Failover Draft, section 5.1 | |
5aa93bcf | 505 | */ |
8c2eab90 | 506 | if ((transport->state == SCTP_ACTIVE) && |
5aa93bcf NH |
507 | (asoc->pf_retrans < transport->pathmaxrxt) && |
508 | (transport->error_count > asoc->pf_retrans)) { | |
509 | ||
510 | sctp_assoc_control_transport(asoc, transport, | |
511 | SCTP_TRANSPORT_PF, | |
512 | 0); | |
513 | ||
514 | /* Update the hb timer to resend a heartbeat every rto */ | |
515 | sctp_cmd_hb_timer_update(commands, transport); | |
516 | } | |
517 | ||
3f7a87d2 | 518 | if (transport->state != SCTP_INACTIVE && |
b9f84786 | 519 | (transport->error_count > transport->pathmaxrxt)) { |
bb33381d DB |
520 | pr_debug("%s: association:%p transport addr:%pISpc failed\n", |
521 | __func__, asoc, &transport->ipaddr.sa); | |
522 | ||
1da177e4 LT |
523 | sctp_assoc_control_transport(asoc, transport, |
524 | SCTP_TRANSPORT_DOWN, | |
525 | SCTP_FAILED_THRESHOLD); | |
526 | } | |
527 | ||
528 | /* E2) For the destination address for which the timer | |
529 | * expires, set RTO <- RTO * 2 ("back off the timer"). The | |
530 | * maximum value discussed in rule C7 above (RTO.max) may be | |
531 | * used to provide an upper bound to this doubling operation. | |
faee47cd VY |
532 | * |
533 | * Special Case: the first HB doesn't trigger exponential backoff. | |
3ad2f3fb | 534 | * The first unacknowledged HB triggers it. We do this with a flag |
faee47cd | 535 | * that indicates that we have an outstanding HB. |
1da177e4 | 536 | */ |
7e99013a | 537 | if (!is_hb || transport->hb_sent) { |
faee47cd | 538 | transport->rto = min((transport->rto * 2), transport->asoc->rto_max); |
196d6759 | 539 | sctp_max_rto(asoc, transport); |
faee47cd | 540 | } |
1da177e4 LT |
541 | } |
542 | ||
543 | /* Worker routine to handle INIT command failure. */ | |
544 | static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands, | |
545 | struct sctp_association *asoc, | |
95c96174 | 546 | unsigned int error) |
1da177e4 LT |
547 | { |
548 | struct sctp_ulpevent *event; | |
549 | ||
cb3f837b | 550 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_CANT_STR_ASSOC, |
a5a35e76 | 551 | (__u16)error, 0, 0, NULL, |
1da177e4 LT |
552 | GFP_ATOMIC); |
553 | ||
554 | if (event) | |
555 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
556 | SCTP_ULPEVENT(event)); | |
557 | ||
558 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
559 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
560 | ||
561 | /* SEND_FAILED sent later when cleaning up the association. */ | |
562 | asoc->outqueue.error = error; | |
563 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
564 | } | |
565 | ||
566 | /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */ | |
567 | static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands, | |
568 | struct sctp_association *asoc, | |
569 | sctp_event_t event_type, | |
570 | sctp_subtype_t subtype, | |
571 | struct sctp_chunk *chunk, | |
95c96174 | 572 | unsigned int error) |
1da177e4 LT |
573 | { |
574 | struct sctp_ulpevent *event; | |
de4594a5 | 575 | struct sctp_chunk *abort; |
1da177e4 LT |
576 | /* Cancel any partial delivery in progress. */ |
577 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); | |
578 | ||
a5a35e76 VY |
579 | if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT) |
580 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
581 | (__u16)error, 0, 0, chunk, | |
582 | GFP_ATOMIC); | |
583 | else | |
584 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
585 | (__u16)error, 0, 0, NULL, | |
1da177e4 LT |
586 | GFP_ATOMIC); |
587 | if (event) | |
588 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
589 | SCTP_ULPEVENT(event)); | |
590 | ||
de4594a5 NH |
591 | if (asoc->overall_error_count >= asoc->max_retrans) { |
592 | abort = sctp_make_violation_max_retrans(asoc, chunk); | |
593 | if (abort) | |
594 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
595 | SCTP_CHUNK(abort)); | |
596 | } | |
597 | ||
1da177e4 LT |
598 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
599 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
600 | ||
1da177e4 LT |
601 | /* SEND_FAILED sent later when cleaning up the association. */ |
602 | asoc->outqueue.error = error; | |
603 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
604 | } | |
605 | ||
606 | /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT | |
607 | * inside the cookie. In reality, this is only used for INIT-ACK processing | |
608 | * since all other cases use "temporary" associations and can do all | |
609 | * their work in statefuns directly. | |
610 | */ | |
611 | static int sctp_cmd_process_init(sctp_cmd_seq_t *commands, | |
612 | struct sctp_association *asoc, | |
613 | struct sctp_chunk *chunk, | |
3182cd84 | 614 | sctp_init_chunk_t *peer_init, |
dd0fc66f | 615 | gfp_t gfp) |
1da177e4 LT |
616 | { |
617 | int error; | |
618 | ||
619 | /* We only process the init as a sideeffect in a single | |
620 | * case. This is when we process the INIT-ACK. If we | |
621 | * fail during INIT processing (due to malloc problems), | |
622 | * just return the error and stop processing the stack. | |
623 | */ | |
de6becdc | 624 | if (!sctp_process_init(asoc, chunk, sctp_source(chunk), peer_init, gfp)) |
1da177e4 LT |
625 | error = -ENOMEM; |
626 | else | |
627 | error = 0; | |
628 | ||
629 | return error; | |
630 | } | |
631 | ||
632 | /* Helper function to break out starting up of heartbeat timers. */ | |
633 | static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds, | |
634 | struct sctp_association *asoc) | |
635 | { | |
636 | struct sctp_transport *t; | |
1da177e4 LT |
637 | |
638 | /* Start a heartbeat timer for each transport on the association. | |
639 | * hold a reference on the transport to make sure none of | |
640 | * the needed data structures go away. | |
641 | */ | |
9dbc15f0 | 642 | list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) { |
1da177e4 LT |
643 | |
644 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) | |
645 | sctp_transport_hold(t); | |
646 | } | |
647 | } | |
648 | ||
649 | static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds, | |
650 | struct sctp_association *asoc) | |
651 | { | |
652 | struct sctp_transport *t; | |
1da177e4 LT |
653 | |
654 | /* Stop all heartbeat timers. */ | |
655 | ||
9dbc15f0 RD |
656 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
657 | transports) { | |
1da177e4 LT |
658 | if (del_timer(&t->hb_timer)) |
659 | sctp_transport_put(t); | |
660 | } | |
661 | } | |
662 | ||
663 | /* Helper function to stop any pending T3-RTX timers */ | |
664 | static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds, | |
d808ad9a | 665 | struct sctp_association *asoc) |
1da177e4 LT |
666 | { |
667 | struct sctp_transport *t; | |
1da177e4 | 668 | |
9dbc15f0 RD |
669 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
670 | transports) { | |
25cc4ae9 | 671 | if (del_timer(&t->T3_rtx_timer)) |
1da177e4 | 672 | sctp_transport_put(t); |
1da177e4 LT |
673 | } |
674 | } | |
675 | ||
676 | ||
677 | /* Helper function to update the heartbeat timer. */ | |
678 | static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds, | |
1da177e4 LT |
679 | 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. */ | |
687 | static 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; | |
34d2d89f | 693 | int was_unconfirmed = 0; |
1da177e4 LT |
694 | |
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. | |
1da177e4 LT |
698 | */ |
699 | t->error_count = 0; | |
f8d96052 TG |
700 | |
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 | */ | |
f648f807 | 709 | if (t->asoc->state < SCTP_STATE_SHUTDOWN_PENDING) |
f8d96052 | 710 | t->asoc->overall_error_count = 0; |
1da177e4 | 711 | |
faee47cd VY |
712 | /* Clear the hb_sent flag to signal that we had a good |
713 | * acknowledgement. | |
714 | */ | |
715 | t->hb_sent = 0; | |
716 | ||
1da177e4 LT |
717 | /* Mark the destination transport address as active if it is not so |
718 | * marked. | |
719 | */ | |
34d2d89f MH |
720 | if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) { |
721 | was_unconfirmed = 1; | |
1da177e4 LT |
722 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, |
723 | SCTP_HEARTBEAT_SUCCESS); | |
34d2d89f | 724 | } |
1da177e4 | 725 | |
5aa93bcf NH |
726 | if (t->state == SCTP_PF) |
727 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, | |
728 | SCTP_HEARTBEAT_SUCCESS); | |
729 | ||
8c2f414a DB |
730 | /* HB-ACK was received for a the proper HB. Consider this |
731 | * forward progress. | |
732 | */ | |
733 | if (t->dst) | |
734 | dst_confirm(t->dst); | |
735 | ||
1da177e4 LT |
736 | /* The receiver of the HEARTBEAT ACK should also perform an |
737 | * RTT measurement for that destination transport address | |
738 | * using the time value carried in the HEARTBEAT ACK chunk. | |
e533ca16 VY |
739 | * If the transport's rto_pending variable has been cleared, |
740 | * it was most likely due to a retransmit. However, we want | |
741 | * to re-enable it to properly update the rto. | |
1da177e4 | 742 | */ |
e533ca16 VY |
743 | if (t->rto_pending == 0) |
744 | t->rto_pending = 1; | |
745 | ||
1da177e4 LT |
746 | hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data; |
747 | sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at)); | |
ad8fec17 SS |
748 | |
749 | /* Update the heartbeat timer. */ | |
750 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) | |
751 | sctp_transport_hold(t); | |
34d2d89f MH |
752 | |
753 | if (was_unconfirmed && asoc->peer.transport_count == 1) | |
754 | sctp_transport_immediate_rtx(t); | |
1da177e4 LT |
755 | } |
756 | ||
1da177e4 LT |
757 | |
758 | /* Helper function to process the process SACK command. */ | |
759 | static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds, | |
760 | struct sctp_association *asoc, | |
edfee033 | 761 | struct sctp_chunk *chunk) |
1da177e4 | 762 | { |
2e3216cd | 763 | int err = 0; |
1da177e4 | 764 | |
edfee033 | 765 | if (sctp_outq_sack(&asoc->outqueue, chunk)) { |
55e26eb9 EB |
766 | struct net *net = sock_net(asoc->base.sk); |
767 | ||
1da177e4 | 768 | /* There are no more TSNs awaiting SACK. */ |
55e26eb9 | 769 | err = sctp_do_sm(net, SCTP_EVENT_T_OTHER, |
1da177e4 LT |
770 | SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN), |
771 | asoc->state, asoc->ep, asoc, NULL, | |
772 | GFP_ATOMIC); | |
1da177e4 LT |
773 | } |
774 | ||
775 | return err; | |
776 | } | |
777 | ||
778 | /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set | |
779 | * the transport for a shutdown chunk. | |
780 | */ | |
d808ad9a | 781 | static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds, |
1da177e4 LT |
782 | struct sctp_association *asoc, |
783 | struct sctp_chunk *chunk) | |
784 | { | |
785 | struct sctp_transport *t; | |
786 | ||
c17b02b3 VY |
787 | if (chunk->transport) |
788 | t = chunk->transport; | |
789 | else { | |
790 | t = sctp_assoc_choose_alter_transport(asoc, | |
9919b455 | 791 | asoc->shutdown_last_sent_to); |
c17b02b3 VY |
792 | chunk->transport = t; |
793 | } | |
1da177e4 LT |
794 | asoc->shutdown_last_sent_to = t; |
795 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto; | |
1da177e4 LT |
796 | } |
797 | ||
798 | /* Helper function to change the state of an association. */ | |
d808ad9a | 799 | static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds, |
1da177e4 LT |
800 | struct sctp_association *asoc, |
801 | sctp_state_t state) | |
802 | { | |
803 | struct sock *sk = asoc->base.sk; | |
804 | ||
805 | asoc->state = state; | |
806 | ||
bb33381d | 807 | pr_debug("%s: asoc:%p[%s]\n", __func__, asoc, sctp_state_tbl[state]); |
3f7a87d2 | 808 | |
1da177e4 | 809 | if (sctp_style(sk, TCP)) { |
3f7a87d2 | 810 | /* Change the sk->sk_state of a TCP-style socket that has |
af901ca1 | 811 | * successfully completed a connect() call. |
1da177e4 LT |
812 | */ |
813 | if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED)) | |
814 | sk->sk_state = SCTP_SS_ESTABLISHED; | |
815 | ||
816 | /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */ | |
817 | if (sctp_state(asoc, SHUTDOWN_RECEIVED) && | |
818 | sctp_sstate(sk, ESTABLISHED)) | |
819 | sk->sk_shutdown |= RCV_SHUTDOWN; | |
820 | } | |
821 | ||
3f7a87d2 FF |
822 | if (sctp_state(asoc, COOKIE_WAIT)) { |
823 | /* Reset init timeouts since they may have been | |
824 | * increased due to timer expirations. | |
825 | */ | |
826 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = | |
1e7d3d90 | 827 | asoc->rto_initial; |
3f7a87d2 | 828 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = |
1e7d3d90 | 829 | asoc->rto_initial; |
3f7a87d2 FF |
830 | } |
831 | ||
1da177e4 LT |
832 | if (sctp_state(asoc, ESTABLISHED) || |
833 | sctp_state(asoc, CLOSED) || | |
834 | sctp_state(asoc, SHUTDOWN_RECEIVED)) { | |
835 | /* Wake up any processes waiting in the asoc's wait queue in | |
836 | * sctp_wait_for_connect() or sctp_wait_for_sndbuf(). | |
d808ad9a | 837 | */ |
1da177e4 LT |
838 | if (waitqueue_active(&asoc->wait)) |
839 | wake_up_interruptible(&asoc->wait); | |
840 | ||
841 | /* Wake up any processes waiting in the sk's sleep queue of | |
842 | * a TCP-style or UDP-style peeled-off socket in | |
843 | * sctp_wait_for_accept() or sctp_wait_for_packet(). | |
844 | * For a UDP-style socket, the waiters are woken up by the | |
845 | * notifications. | |
846 | */ | |
847 | if (!sctp_style(sk, UDP)) | |
848 | sk->sk_state_change(sk); | |
849 | } | |
850 | } | |
851 | ||
852 | /* Helper function to delete an association. */ | |
853 | static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds, | |
854 | struct sctp_association *asoc) | |
855 | { | |
856 | struct sock *sk = asoc->base.sk; | |
857 | ||
858 | /* If it is a non-temporary association belonging to a TCP-style | |
d808ad9a | 859 | * listening socket that is not closed, do not free it so that accept() |
1da177e4 | 860 | * can pick it up later. |
d808ad9a | 861 | */ |
1da177e4 LT |
862 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) && |
863 | (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK)) | |
864 | return; | |
865 | ||
866 | sctp_unhash_established(asoc); | |
867 | sctp_association_free(asoc); | |
868 | } | |
869 | ||
870 | /* | |
871 | * ADDIP Section 4.1 ASCONF Chunk Procedures | |
872 | * A4) Start a T-4 RTO timer, using the RTO value of the selected | |
873 | * destination address (we use active path instead of primary path just | |
d808ad9a | 874 | * because primary path may be inactive. |
1da177e4 LT |
875 | */ |
876 | static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds, | |
877 | struct sctp_association *asoc, | |
878 | struct sctp_chunk *chunk) | |
879 | { | |
880 | struct sctp_transport *t; | |
881 | ||
9919b455 | 882 | t = sctp_assoc_choose_alter_transport(asoc, chunk->transport); |
1da177e4 LT |
883 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto; |
884 | chunk->transport = t; | |
885 | } | |
886 | ||
d808ad9a | 887 | /* Process an incoming Operation Error Chunk. */ |
1da177e4 LT |
888 | static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds, |
889 | struct sctp_association *asoc, | |
890 | struct sctp_chunk *chunk) | |
891 | { | |
1da177e4 | 892 | struct sctp_errhdr *err_hdr; |
3df26787 WY |
893 | struct sctp_ulpevent *ev; |
894 | ||
895 | while (chunk->chunk_end > chunk->skb->data) { | |
896 | err_hdr = (struct sctp_errhdr *)(chunk->skb->data); | |
897 | ||
898 | ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0, | |
899 | GFP_ATOMIC); | |
900 | if (!ev) | |
901 | return; | |
902 | ||
903 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
904 | ||
905 | switch (err_hdr->cause) { | |
906 | case SCTP_ERROR_UNKNOWN_CHUNK: | |
907 | { | |
908 | sctp_chunkhdr_t *unk_chunk_hdr; | |
909 | ||
910 | unk_chunk_hdr = (sctp_chunkhdr_t *)err_hdr->variable; | |
911 | switch (unk_chunk_hdr->type) { | |
912 | /* ADDIP 4.1 A9) If the peer responds to an ASCONF with | |
913 | * an ERROR chunk reporting that it did not recognized | |
914 | * the ASCONF chunk type, the sender of the ASCONF MUST | |
915 | * NOT send any further ASCONF chunks and MUST stop its | |
916 | * T-4 timer. | |
917 | */ | |
918 | case SCTP_CID_ASCONF: | |
919 | if (asoc->peer.asconf_capable == 0) | |
920 | break; | |
921 | ||
922 | asoc->peer.asconf_capable = 0; | |
923 | sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP, | |
1da177e4 | 924 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); |
3df26787 WY |
925 | break; |
926 | default: | |
927 | break; | |
928 | } | |
1da177e4 | 929 | break; |
3df26787 | 930 | } |
1da177e4 LT |
931 | default: |
932 | break; | |
933 | } | |
1da177e4 LT |
934 | } |
935 | } | |
936 | ||
937 | /* Process variable FWDTSN chunk information. */ | |
d808ad9a | 938 | static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq, |
1da177e4 LT |
939 | struct sctp_chunk *chunk) |
940 | { | |
941 | struct sctp_fwdtsn_skip *skip; | |
942 | /* Walk through all the skipped SSNs */ | |
943 | sctp_walk_fwdtsn(skip, chunk) { | |
944 | sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn)); | |
945 | } | |
1da177e4 LT |
946 | } |
947 | ||
d808ad9a | 948 | /* Helper function to remove the association non-primary peer |
1da177e4 | 949 | * transports. |
d808ad9a | 950 | */ |
1da177e4 LT |
951 | static void sctp_cmd_del_non_primary(struct sctp_association *asoc) |
952 | { | |
953 | struct sctp_transport *t; | |
954 | struct list_head *pos; | |
955 | struct list_head *temp; | |
956 | ||
957 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
958 | t = list_entry(pos, struct sctp_transport, transports); | |
5f242a13 | 959 | if (!sctp_cmp_addr_exact(&t->ipaddr, |
d808ad9a | 960 | &asoc->peer.primary_addr)) { |
73e67420 | 961 | sctp_assoc_rm_peer(asoc, t); |
1da177e4 LT |
962 | } |
963 | } | |
1da177e4 LT |
964 | } |
965 | ||
8de8c873 SS |
966 | /* Helper function to set sk_err on a 1-1 style socket. */ |
967 | static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error) | |
968 | { | |
969 | struct sock *sk = asoc->base.sk; | |
970 | ||
971 | if (!sctp_style(sk, UDP)) | |
972 | sk->sk_err = error; | |
973 | } | |
974 | ||
07d93967 VY |
975 | /* Helper function to generate an association change event */ |
976 | static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands, | |
977 | struct sctp_association *asoc, | |
978 | u8 state) | |
979 | { | |
980 | struct sctp_ulpevent *ev; | |
981 | ||
982 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0, | |
983 | asoc->c.sinit_num_ostreams, | |
984 | asoc->c.sinit_max_instreams, | |
985 | NULL, GFP_ATOMIC); | |
986 | if (ev) | |
987 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
988 | } | |
989 | ||
990 | /* Helper function to generate an adaptation indication event */ | |
991 | static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands, | |
992 | struct sctp_association *asoc) | |
993 | { | |
994 | struct sctp_ulpevent *ev; | |
995 | ||
996 | ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); | |
997 | ||
998 | if (ev) | |
999 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
1000 | } | |
1001 | ||
96cd0d3d VY |
1002 | |
1003 | static void sctp_cmd_t1_timer_update(struct sctp_association *asoc, | |
1004 | sctp_event_timeout_t timer, | |
1005 | char *name) | |
1006 | { | |
1007 | struct sctp_transport *t; | |
1008 | ||
1009 | t = asoc->init_last_sent_to; | |
1010 | asoc->init_err_counter++; | |
1011 | ||
1012 | if (t->init_sent_count > (asoc->init_cycle + 1)) { | |
1013 | asoc->timeouts[timer] *= 2; | |
1014 | if (asoc->timeouts[timer] > asoc->max_init_timeo) { | |
1015 | asoc->timeouts[timer] = asoc->max_init_timeo; | |
1016 | } | |
1017 | asoc->init_cycle++; | |
bb33381d DB |
1018 | |
1019 | pr_debug("%s: T1[%s] timeout adjustment init_err_counter:%d" | |
1020 | " cycle:%d timeout:%ld\n", __func__, name, | |
1021 | asoc->init_err_counter, asoc->init_cycle, | |
1022 | asoc->timeouts[timer]); | |
96cd0d3d VY |
1023 | } |
1024 | ||
1025 | } | |
1026 | ||
9c5c62be VY |
1027 | /* Send the whole message, chunk by chunk, to the outqueue. |
1028 | * This way the whole message is queued up and bundling if | |
1029 | * encouraged for small fragments. | |
1030 | */ | |
1031 | static int sctp_cmd_send_msg(struct sctp_association *asoc, | |
1032 | struct sctp_datamsg *msg) | |
1033 | { | |
1034 | struct sctp_chunk *chunk; | |
1035 | int error = 0; | |
1036 | ||
1037 | list_for_each_entry(chunk, &msg->chunks, frag_list) { | |
1038 | error = sctp_outq_tail(&asoc->outqueue, chunk); | |
1039 | if (error) | |
1040 | break; | |
1041 | } | |
1042 | ||
1043 | return error; | |
1044 | } | |
1045 | ||
1046 | ||
c0786693 VY |
1047 | /* Sent the next ASCONF packet currently stored in the association. |
1048 | * This happens after the ASCONF_ACK was succeffully processed. | |
1049 | */ | |
1050 | static void sctp_cmd_send_asconf(struct sctp_association *asoc) | |
1051 | { | |
55e26eb9 EB |
1052 | struct net *net = sock_net(asoc->base.sk); |
1053 | ||
c0786693 VY |
1054 | /* Send the next asconf chunk from the addip chunk |
1055 | * queue. | |
1056 | */ | |
1057 | if (!list_empty(&asoc->addip_chunk_list)) { | |
1058 | struct list_head *entry = asoc->addip_chunk_list.next; | |
1059 | struct sctp_chunk *asconf = list_entry(entry, | |
1060 | struct sctp_chunk, list); | |
1061 | list_del_init(entry); | |
1062 | ||
1063 | /* Hold the chunk until an ASCONF_ACK is received. */ | |
1064 | sctp_chunk_hold(asconf); | |
55e26eb9 | 1065 | if (sctp_primitive_ASCONF(net, asoc, asconf)) |
c0786693 VY |
1066 | sctp_chunk_free(asconf); |
1067 | else | |
1068 | asoc->addip_last_asconf = asconf; | |
1069 | } | |
1070 | } | |
1071 | ||
9c5c62be | 1072 | |
1da177e4 LT |
1073 | /* These three macros allow us to pull the debugging code out of the |
1074 | * main flow of sctp_do_sm() to keep attention focused on the real | |
1075 | * functionality there. | |
1076 | */ | |
bb33381d DB |
1077 | #define debug_pre_sfn() \ |
1078 | pr_debug("%s[pre-fn]: ep:%p, %s, %s, asoc:%p[%s], %s\n", __func__, \ | |
1079 | ep, sctp_evttype_tbl[event_type], (*debug_fn)(subtype), \ | |
1080 | asoc, sctp_state_tbl[state], state_fn->name) | |
1081 | ||
1082 | #define debug_post_sfn() \ | |
1083 | pr_debug("%s[post-fn]: asoc:%p, status:%s\n", __func__, asoc, \ | |
1084 | sctp_status_tbl[status]) | |
1085 | ||
1086 | #define debug_post_sfx() \ | |
1087 | pr_debug("%s[post-sfx]: error:%d, asoc:%p[%s]\n", __func__, error, \ | |
1088 | asoc, sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \ | |
1089 | sctp_assoc2id(asoc))) ? asoc->state : SCTP_STATE_CLOSED]) | |
1da177e4 LT |
1090 | |
1091 | /* | |
1092 | * This is the master state machine processing function. | |
1093 | * | |
1094 | * If you want to understand all of lksctp, this is a | |
1095 | * good place to start. | |
1096 | */ | |
55e26eb9 | 1097 | int sctp_do_sm(struct net *net, sctp_event_t event_type, sctp_subtype_t subtype, |
1da177e4 LT |
1098 | sctp_state_t state, |
1099 | struct sctp_endpoint *ep, | |
1100 | struct sctp_association *asoc, | |
1101 | void *event_arg, | |
dd0fc66f | 1102 | gfp_t gfp) |
1da177e4 LT |
1103 | { |
1104 | sctp_cmd_seq_t commands; | |
1105 | const sctp_sm_table_entry_t *state_fn; | |
1106 | sctp_disposition_t status; | |
1107 | int error = 0; | |
1108 | typedef const char *(printfn_t)(sctp_subtype_t); | |
1da177e4 LT |
1109 | static printfn_t *table[] = { |
1110 | NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname, | |
1111 | }; | |
1112 | printfn_t *debug_fn __attribute__ ((unused)) = table[event_type]; | |
1113 | ||
1114 | /* Look up the state function, run it, and then process the | |
1115 | * side effects. These three steps are the heart of lksctp. | |
1116 | */ | |
55e26eb9 | 1117 | state_fn = sctp_sm_lookup_event(net, event_type, state, subtype); |
1da177e4 LT |
1118 | |
1119 | sctp_init_cmd_seq(&commands); | |
1120 | ||
bb33381d | 1121 | debug_pre_sfn(); |
131334d0 | 1122 | status = state_fn->fn(net, ep, asoc, subtype, event_arg, &commands); |
bb33381d | 1123 | debug_post_sfn(); |
1da177e4 LT |
1124 | |
1125 | error = sctp_side_effects(event_type, subtype, state, | |
d808ad9a | 1126 | ep, asoc, event_arg, status, |
1da177e4 | 1127 | &commands, gfp); |
bb33381d | 1128 | debug_post_sfx(); |
1da177e4 LT |
1129 | |
1130 | return error; | |
1131 | } | |
1132 | ||
1da177e4 LT |
1133 | /***************************************************************** |
1134 | * This the master state function side effect processing function. | |
1135 | *****************************************************************/ | |
1136 | static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, | |
1137 | sctp_state_t state, | |
1138 | struct sctp_endpoint *ep, | |
1139 | struct sctp_association *asoc, | |
1140 | void *event_arg, | |
1141 | sctp_disposition_t status, | |
1142 | sctp_cmd_seq_t *commands, | |
dd0fc66f | 1143 | gfp_t gfp) |
1da177e4 LT |
1144 | { |
1145 | int error; | |
1146 | ||
1147 | /* FIXME - Most of the dispositions left today would be categorized | |
1148 | * as "exceptional" dispositions. For those dispositions, it | |
1149 | * may not be proper to run through any of the commands at all. | |
1150 | * For example, the command interpreter might be run only with | |
1151 | * disposition SCTP_DISPOSITION_CONSUME. | |
1152 | */ | |
1153 | if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state, | |
1154 | ep, asoc, | |
1155 | event_arg, status, | |
1156 | commands, gfp))) | |
1157 | goto bail; | |
1158 | ||
1159 | switch (status) { | |
1160 | case SCTP_DISPOSITION_DISCARD: | |
bb33381d DB |
1161 | pr_debug("%s: ignored sctp protocol event - state:%d, " |
1162 | "event_type:%d, event_id:%d\n", __func__, state, | |
1163 | event_type, subtype.chunk); | |
1da177e4 LT |
1164 | break; |
1165 | ||
1166 | case SCTP_DISPOSITION_NOMEM: | |
1167 | /* We ran out of memory, so we need to discard this | |
1168 | * packet. | |
1169 | */ | |
1170 | /* BUG--we should now recover some memory, probably by | |
1171 | * reneging... | |
1172 | */ | |
1173 | error = -ENOMEM; | |
1174 | break; | |
1175 | ||
d808ad9a | 1176 | case SCTP_DISPOSITION_DELETE_TCB: |
1da177e4 LT |
1177 | /* This should now be a command. */ |
1178 | break; | |
1179 | ||
1180 | case SCTP_DISPOSITION_CONSUME: | |
1181 | case SCTP_DISPOSITION_ABORT: | |
1182 | /* | |
1183 | * We should no longer have much work to do here as the | |
1184 | * real work has been done as explicit commands above. | |
1185 | */ | |
1186 | break; | |
1187 | ||
1188 | case SCTP_DISPOSITION_VIOLATION: | |
e87cc472 JP |
1189 | net_err_ratelimited("protocol violation state %d chunkid %d\n", |
1190 | state, subtype.chunk); | |
1da177e4 LT |
1191 | break; |
1192 | ||
1193 | case SCTP_DISPOSITION_NOT_IMPL: | |
145ce502 JP |
1194 | pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n", |
1195 | state, event_type, subtype.chunk); | |
1da177e4 LT |
1196 | break; |
1197 | ||
1198 | case SCTP_DISPOSITION_BUG: | |
145ce502 | 1199 | pr_err("bug in state %d, event_type %d, event_id %d\n", |
1da177e4 LT |
1200 | state, event_type, subtype.chunk); |
1201 | BUG(); | |
1202 | break; | |
1203 | ||
1204 | default: | |
145ce502 | 1205 | pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n", |
1da177e4 LT |
1206 | status, state, event_type, subtype.chunk); |
1207 | BUG(); | |
1208 | break; | |
3ff50b79 | 1209 | } |
1da177e4 LT |
1210 | |
1211 | bail: | |
1212 | return error; | |
1213 | } | |
1214 | ||
1215 | /******************************************************************** | |
1216 | * 2nd Level Abstractions | |
1217 | ********************************************************************/ | |
1218 | ||
1219 | /* This is the side-effect interpreter. */ | |
1220 | static int sctp_cmd_interpreter(sctp_event_t event_type, | |
1221 | sctp_subtype_t subtype, | |
1222 | sctp_state_t state, | |
1223 | struct sctp_endpoint *ep, | |
1224 | struct sctp_association *asoc, | |
1225 | void *event_arg, | |
d808ad9a | 1226 | sctp_disposition_t status, |
1da177e4 | 1227 | sctp_cmd_seq_t *commands, |
dd0fc66f | 1228 | gfp_t gfp) |
1da177e4 LT |
1229 | { |
1230 | int error = 0; | |
1231 | int force; | |
1232 | sctp_cmd_t *cmd; | |
1233 | struct sctp_chunk *new_obj; | |
1234 | struct sctp_chunk *chunk = NULL; | |
1235 | struct sctp_packet *packet; | |
1da177e4 LT |
1236 | struct timer_list *timer; |
1237 | unsigned long timeout; | |
1238 | struct sctp_transport *t; | |
1239 | struct sctp_sackhdr sackh; | |
1240 | int local_cork = 0; | |
1241 | ||
1242 | if (SCTP_EVENT_T_TIMEOUT != event_type) | |
ea110733 | 1243 | chunk = event_arg; |
1da177e4 LT |
1244 | |
1245 | /* Note: This whole file is a huge candidate for rework. | |
1246 | * For example, each command could either have its own handler, so | |
1247 | * the loop would look like: | |
1248 | * while (cmds) | |
1249 | * cmd->handle(x, y, z) | |
1250 | * --jgrimm | |
1251 | */ | |
1252 | while (NULL != (cmd = sctp_next_cmd(commands))) { | |
1253 | switch (cmd->verb) { | |
1254 | case SCTP_CMD_NOP: | |
1255 | /* Do nothing. */ | |
1256 | break; | |
1257 | ||
1258 | case SCTP_CMD_NEW_ASOC: | |
1259 | /* Register a new association. */ | |
1260 | if (local_cork) { | |
d808ad9a | 1261 | sctp_outq_uncork(&asoc->outqueue); |
1da177e4 LT |
1262 | local_cork = 0; |
1263 | } | |
f9e42b85 | 1264 | |
1da177e4 | 1265 | /* Register with the endpoint. */ |
f9e42b85 DB |
1266 | asoc = cmd->obj.asoc; |
1267 | BUG_ON(asoc->peer.primary_path == NULL); | |
1da177e4 LT |
1268 | sctp_endpoint_add_asoc(ep, asoc); |
1269 | sctp_hash_established(asoc); | |
1270 | break; | |
1271 | ||
1272 | case SCTP_CMD_UPDATE_ASSOC: | |
b26ddd81 | 1273 | sctp_assoc_update(asoc, cmd->obj.asoc); |
1da177e4 LT |
1274 | break; |
1275 | ||
1276 | case SCTP_CMD_PURGE_OUTQUEUE: | |
1277 | sctp_outq_teardown(&asoc->outqueue); | |
1278 | break; | |
1279 | ||
d808ad9a | 1280 | case SCTP_CMD_DELETE_TCB: |
1da177e4 LT |
1281 | if (local_cork) { |
1282 | sctp_outq_uncork(&asoc->outqueue); | |
1283 | local_cork = 0; | |
1284 | } | |
1285 | /* Delete the current association. */ | |
1286 | sctp_cmd_delete_tcb(commands, asoc); | |
1287 | asoc = NULL; | |
1288 | break; | |
1289 | ||
1290 | case SCTP_CMD_NEW_STATE: | |
1291 | /* Enter a new state. */ | |
1292 | sctp_cmd_new_state(commands, asoc, cmd->obj.state); | |
1293 | break; | |
1294 | ||
1295 | case SCTP_CMD_REPORT_TSN: | |
1296 | /* Record the arrival of a TSN. */ | |
8e1ee18c | 1297 | error = sctp_tsnmap_mark(&asoc->peer.tsn_map, |
4244854d | 1298 | cmd->obj.u32, NULL); |
1da177e4 LT |
1299 | break; |
1300 | ||
1301 | case SCTP_CMD_REPORT_FWDTSN: | |
1302 | /* Move the Cumulattive TSN Ack ahead. */ | |
1303 | sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32); | |
1304 | ||
ea2dfb37 VY |
1305 | /* purge the fragmentation queue */ |
1306 | sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32); | |
1307 | ||
1da177e4 LT |
1308 | /* Abort any in progress partial delivery. */ |
1309 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); | |
1310 | break; | |
1311 | ||
1312 | case SCTP_CMD_PROCESS_FWDTSN: | |
b26ddd81 | 1313 | sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.chunk); |
d808ad9a | 1314 | break; |
1da177e4 LT |
1315 | |
1316 | case SCTP_CMD_GEN_SACK: | |
1317 | /* Generate a Selective ACK. | |
1318 | * The argument tells us whether to just count | |
1319 | * the packet and MAYBE generate a SACK, or | |
1320 | * force a SACK out. | |
1321 | */ | |
1322 | force = cmd->obj.i32; | |
1323 | error = sctp_gen_sack(asoc, force, commands); | |
1324 | break; | |
1325 | ||
1326 | case SCTP_CMD_PROCESS_SACK: | |
1327 | /* Process an inbound SACK. */ | |
1328 | error = sctp_cmd_process_sack(commands, asoc, | |
b26ddd81 | 1329 | cmd->obj.chunk); |
1da177e4 LT |
1330 | break; |
1331 | ||
1332 | case SCTP_CMD_GEN_INIT_ACK: | |
1333 | /* Generate an INIT ACK chunk. */ | |
1334 | new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC, | |
1335 | 0); | |
1336 | if (!new_obj) | |
1337 | goto nomem; | |
1338 | ||
1339 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1340 | SCTP_CHUNK(new_obj)); | |
1341 | break; | |
1342 | ||
1343 | case SCTP_CMD_PEER_INIT: | |
1344 | /* Process a unified INIT from the peer. | |
1345 | * Note: Only used during INIT-ACK processing. If | |
1346 | * there is an error just return to the outter | |
1347 | * layer which will bail. | |
1348 | */ | |
1349 | error = sctp_cmd_process_init(commands, asoc, chunk, | |
b26ddd81 | 1350 | cmd->obj.init, gfp); |
1da177e4 LT |
1351 | break; |
1352 | ||
1353 | case SCTP_CMD_GEN_COOKIE_ECHO: | |
1354 | /* Generate a COOKIE ECHO chunk. */ | |
1355 | new_obj = sctp_make_cookie_echo(asoc, chunk); | |
1356 | if (!new_obj) { | |
b26ddd81 NH |
1357 | if (cmd->obj.chunk) |
1358 | sctp_chunk_free(cmd->obj.chunk); | |
1da177e4 LT |
1359 | goto nomem; |
1360 | } | |
1361 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1362 | SCTP_CHUNK(new_obj)); | |
1363 | ||
1364 | /* If there is an ERROR chunk to be sent along with | |
1365 | * the COOKIE_ECHO, send it, too. | |
1366 | */ | |
b26ddd81 | 1367 | if (cmd->obj.chunk) |
1da177e4 | 1368 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
b26ddd81 | 1369 | SCTP_CHUNK(cmd->obj.chunk)); |
1da177e4 | 1370 | |
96cd0d3d VY |
1371 | if (new_obj->transport) { |
1372 | new_obj->transport->init_sent_count++; | |
1373 | asoc->init_last_sent_to = new_obj->transport; | |
1374 | } | |
1375 | ||
1da177e4 | 1376 | /* FIXME - Eventually come up with a cleaner way to |
d808ad9a YH |
1377 | * enabling COOKIE-ECHO + DATA bundling during |
1378 | * multihoming stale cookie scenarios, the following | |
1379 | * command plays with asoc->peer.retran_path to | |
1380 | * avoid the problem of sending the COOKIE-ECHO and | |
1381 | * DATA in different paths, which could result | |
1382 | * in the association being ABORTed if the DATA chunk | |
1da177e4 LT |
1383 | * is processed first by the server. Checking the |
1384 | * init error counter simply causes this command | |
1385 | * to be executed only during failed attempts of | |
1386 | * association establishment. | |
1387 | */ | |
3f7a87d2 FF |
1388 | if ((asoc->peer.retran_path != |
1389 | asoc->peer.primary_path) && | |
1390 | (asoc->init_err_counter > 0)) { | |
1391 | sctp_add_cmd_sf(commands, | |
d808ad9a | 1392 | SCTP_CMD_FORCE_PRIM_RETRAN, |
1da177e4 LT |
1393 | SCTP_NULL()); |
1394 | } | |
1395 | ||
1396 | break; | |
1397 | ||
1398 | case SCTP_CMD_GEN_SHUTDOWN: | |
1399 | /* Generate SHUTDOWN when in SHUTDOWN_SENT state. | |
1400 | * Reset error counts. | |
1401 | */ | |
1402 | asoc->overall_error_count = 0; | |
1403 | ||
1404 | /* Generate a SHUTDOWN chunk. */ | |
1405 | new_obj = sctp_make_shutdown(asoc, chunk); | |
1406 | if (!new_obj) | |
1407 | goto nomem; | |
1408 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1409 | SCTP_CHUNK(new_obj)); | |
1410 | break; | |
1411 | ||
1412 | case SCTP_CMD_CHUNK_ULP: | |
1413 | /* Send a chunk to the sockets layer. */ | |
bb33381d DB |
1414 | pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n", |
1415 | __func__, cmd->obj.chunk, &asoc->ulpq); | |
1416 | ||
b26ddd81 | 1417 | sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.chunk, |
1da177e4 LT |
1418 | GFP_ATOMIC); |
1419 | break; | |
1420 | ||
1421 | case SCTP_CMD_EVENT_ULP: | |
1422 | /* Send a notification to the sockets layer. */ | |
bb33381d DB |
1423 | pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n", |
1424 | __func__, cmd->obj.ulpevent, &asoc->ulpq); | |
1425 | ||
b26ddd81 | 1426 | sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ulpevent); |
1da177e4 LT |
1427 | break; |
1428 | ||
1429 | case SCTP_CMD_REPLY: | |
1430 | /* If an caller has not already corked, do cork. */ | |
1431 | if (!asoc->outqueue.cork) { | |
1432 | sctp_outq_cork(&asoc->outqueue); | |
1433 | local_cork = 1; | |
1434 | } | |
1435 | /* Send a chunk to our peer. */ | |
b26ddd81 | 1436 | error = sctp_outq_tail(&asoc->outqueue, cmd->obj.chunk); |
1da177e4 LT |
1437 | break; |
1438 | ||
1439 | case SCTP_CMD_SEND_PKT: | |
1440 | /* Send a full packet to our peer. */ | |
b26ddd81 | 1441 | packet = cmd->obj.packet; |
1da177e4 LT |
1442 | sctp_packet_transmit(packet); |
1443 | sctp_ootb_pkt_free(packet); | |
1444 | break; | |
1445 | ||
b6157d8e VY |
1446 | case SCTP_CMD_T1_RETRAN: |
1447 | /* Mark a transport for retransmission. */ | |
1448 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1449 | SCTP_RTXR_T1_RTX); | |
1450 | break; | |
1451 | ||
1da177e4 LT |
1452 | case SCTP_CMD_RETRAN: |
1453 | /* Mark a transport for retransmission. */ | |
1454 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1455 | SCTP_RTXR_T3_RTX); | |
1456 | break; | |
1457 | ||
1da177e4 LT |
1458 | case SCTP_CMD_ECN_CE: |
1459 | /* Do delayed CE processing. */ | |
1460 | sctp_do_ecn_ce_work(asoc, cmd->obj.u32); | |
1461 | break; | |
1462 | ||
1463 | case SCTP_CMD_ECN_ECNE: | |
1464 | /* Do delayed ECNE processing. */ | |
1465 | new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32, | |
1466 | chunk); | |
1467 | if (new_obj) | |
1468 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1469 | SCTP_CHUNK(new_obj)); | |
1470 | break; | |
1471 | ||
1472 | case SCTP_CMD_ECN_CWR: | |
1473 | /* Do delayed CWR processing. */ | |
1474 | sctp_do_ecn_cwr_work(asoc, cmd->obj.u32); | |
1475 | break; | |
1476 | ||
1477 | case SCTP_CMD_SETUP_T2: | |
b26ddd81 | 1478 | sctp_cmd_setup_t2(commands, asoc, cmd->obj.chunk); |
1da177e4 LT |
1479 | break; |
1480 | ||
f8d96052 TG |
1481 | case SCTP_CMD_TIMER_START_ONCE: |
1482 | timer = &asoc->timers[cmd->obj.to]; | |
1483 | ||
1484 | if (timer_pending(timer)) | |
1485 | break; | |
1486 | /* fall through */ | |
1487 | ||
1da177e4 LT |
1488 | case SCTP_CMD_TIMER_START: |
1489 | timer = &asoc->timers[cmd->obj.to]; | |
1490 | timeout = asoc->timeouts[cmd->obj.to]; | |
09a62660 | 1491 | BUG_ON(!timeout); |
1da177e4 LT |
1492 | |
1493 | timer->expires = jiffies + timeout; | |
1494 | sctp_association_hold(asoc); | |
1495 | add_timer(timer); | |
1496 | break; | |
1497 | ||
1498 | case SCTP_CMD_TIMER_RESTART: | |
1499 | timer = &asoc->timers[cmd->obj.to]; | |
1500 | timeout = asoc->timeouts[cmd->obj.to]; | |
1501 | if (!mod_timer(timer, jiffies + timeout)) | |
1502 | sctp_association_hold(asoc); | |
1503 | break; | |
1504 | ||
1505 | case SCTP_CMD_TIMER_STOP: | |
1506 | timer = &asoc->timers[cmd->obj.to]; | |
25cc4ae9 | 1507 | if (del_timer(timer)) |
1da177e4 LT |
1508 | sctp_association_put(asoc); |
1509 | break; | |
1510 | ||
3f7a87d2 | 1511 | case SCTP_CMD_INIT_CHOOSE_TRANSPORT: |
b26ddd81 | 1512 | chunk = cmd->obj.chunk; |
9919b455 WY |
1513 | t = sctp_assoc_choose_alter_transport(asoc, |
1514 | asoc->init_last_sent_to); | |
3f7a87d2 FF |
1515 | asoc->init_last_sent_to = t; |
1516 | chunk->transport = t; | |
1517 | t->init_sent_count++; | |
e0e9db17 VY |
1518 | /* Set the new transport as primary */ |
1519 | sctp_assoc_set_primary(asoc, t); | |
3f7a87d2 FF |
1520 | break; |
1521 | ||
1da177e4 LT |
1522 | case SCTP_CMD_INIT_RESTART: |
1523 | /* Do the needed accounting and updates | |
1524 | * associated with restarting an initialization | |
3f7a87d2 FF |
1525 | * timer. Only multiply the timeout by two if |
1526 | * all transports have been tried at the current | |
1527 | * timeout. | |
1528 | */ | |
96cd0d3d VY |
1529 | sctp_cmd_t1_timer_update(asoc, |
1530 | SCTP_EVENT_TIMEOUT_T1_INIT, | |
1531 | "INIT"); | |
3f7a87d2 FF |
1532 | |
1533 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
1534 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
1535 | break; | |
1536 | ||
1537 | case SCTP_CMD_COOKIEECHO_RESTART: | |
1538 | /* Do the needed accounting and updates | |
1539 | * associated with restarting an initialization | |
1540 | * timer. Only multiply the timeout by two if | |
1541 | * all transports have been tried at the current | |
1542 | * timeout. | |
1da177e4 | 1543 | */ |
96cd0d3d VY |
1544 | sctp_cmd_t1_timer_update(asoc, |
1545 | SCTP_EVENT_TIMEOUT_T1_COOKIE, | |
1546 | "COOKIE"); | |
1da177e4 LT |
1547 | |
1548 | /* If we've sent any data bundled with | |
1549 | * COOKIE-ECHO we need to resend. | |
1550 | */ | |
9dbc15f0 RD |
1551 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1552 | transports) { | |
b6157d8e VY |
1553 | sctp_retransmit_mark(&asoc->outqueue, t, |
1554 | SCTP_RTXR_T1_RTX); | |
1da177e4 LT |
1555 | } |
1556 | ||
1557 | sctp_add_cmd_sf(commands, | |
1558 | SCTP_CMD_TIMER_RESTART, | |
3f7a87d2 | 1559 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); |
1da177e4 LT |
1560 | break; |
1561 | ||
1562 | case SCTP_CMD_INIT_FAILED: | |
dc251b2b | 1563 | sctp_cmd_init_failed(commands, asoc, cmd->obj.err); |
1da177e4 LT |
1564 | break; |
1565 | ||
1566 | case SCTP_CMD_ASSOC_FAILED: | |
1567 | sctp_cmd_assoc_failed(commands, asoc, event_type, | |
5be291fe | 1568 | subtype, chunk, cmd->obj.err); |
1da177e4 LT |
1569 | break; |
1570 | ||
3f7a87d2 FF |
1571 | case SCTP_CMD_INIT_COUNTER_INC: |
1572 | asoc->init_err_counter++; | |
1da177e4 LT |
1573 | break; |
1574 | ||
3f7a87d2 FF |
1575 | case SCTP_CMD_INIT_COUNTER_RESET: |
1576 | asoc->init_err_counter = 0; | |
1577 | asoc->init_cycle = 0; | |
96cd0d3d VY |
1578 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1579 | transports) { | |
1580 | t->init_sent_count = 0; | |
1581 | } | |
1da177e4 LT |
1582 | break; |
1583 | ||
1584 | case SCTP_CMD_REPORT_DUP: | |
1585 | sctp_tsnmap_mark_dup(&asoc->peer.tsn_map, | |
1586 | cmd->obj.u32); | |
1587 | break; | |
1588 | ||
1589 | case SCTP_CMD_REPORT_BAD_TAG: | |
bb33381d | 1590 | pr_debug("%s: vtag mismatch!\n", __func__); |
1da177e4 LT |
1591 | break; |
1592 | ||
1593 | case SCTP_CMD_STRIKE: | |
1594 | /* Mark one strike against a transport. */ | |
5aa93bcf NH |
1595 | sctp_do_8_2_transport_strike(commands, asoc, |
1596 | cmd->obj.transport, 0); | |
7e99013a VY |
1597 | break; |
1598 | ||
1599 | case SCTP_CMD_TRANSPORT_IDLE: | |
1600 | t = cmd->obj.transport; | |
1601 | sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE); | |
1da177e4 LT |
1602 | break; |
1603 | ||
7e99013a | 1604 | case SCTP_CMD_TRANSPORT_HB_SENT: |
1da177e4 | 1605 | t = cmd->obj.transport; |
5aa93bcf NH |
1606 | sctp_do_8_2_transport_strike(commands, asoc, |
1607 | t, 1); | |
7e99013a | 1608 | t->hb_sent = 1; |
1da177e4 LT |
1609 | break; |
1610 | ||
1611 | case SCTP_CMD_TRANSPORT_ON: | |
1612 | t = cmd->obj.transport; | |
1613 | sctp_cmd_transport_on(commands, asoc, t, chunk); | |
1614 | break; | |
1615 | ||
1616 | case SCTP_CMD_HB_TIMERS_START: | |
1617 | sctp_cmd_hb_timers_start(commands, asoc); | |
1618 | break; | |
1619 | ||
1620 | case SCTP_CMD_HB_TIMER_UPDATE: | |
1621 | t = cmd->obj.transport; | |
765ff02e | 1622 | sctp_cmd_hb_timer_update(commands, t); |
1da177e4 LT |
1623 | break; |
1624 | ||
1625 | case SCTP_CMD_HB_TIMERS_STOP: | |
1626 | sctp_cmd_hb_timers_stop(commands, asoc); | |
1627 | break; | |
1628 | ||
1629 | case SCTP_CMD_REPORT_ERROR: | |
1630 | error = cmd->obj.error; | |
1631 | break; | |
1632 | ||
1633 | case SCTP_CMD_PROCESS_CTSN: | |
1634 | /* Dummy up a SACK for processing. */ | |
2178eda8 | 1635 | sackh.cum_tsn_ack = cmd->obj.be32; |
d4d6fb57 VY |
1636 | sackh.a_rwnd = asoc->peer.rwnd + |
1637 | asoc->outqueue.outstanding_bytes; | |
1da177e4 LT |
1638 | sackh.num_gap_ack_blocks = 0; |
1639 | sackh.num_dup_tsns = 0; | |
f6e80abe | 1640 | chunk->subh.sack_hdr = &sackh; |
1da177e4 | 1641 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, |
f6e80abe | 1642 | SCTP_CHUNK(chunk)); |
1da177e4 LT |
1643 | break; |
1644 | ||
1645 | case SCTP_CMD_DISCARD_PACKET: | |
2e3216cd VY |
1646 | /* We need to discard the whole packet. |
1647 | * Uncork the queue since there might be | |
1648 | * responses pending | |
1649 | */ | |
1da177e4 | 1650 | chunk->pdiscard = 1; |
2e3216cd VY |
1651 | if (asoc) { |
1652 | sctp_outq_uncork(&asoc->outqueue); | |
1653 | local_cork = 0; | |
1654 | } | |
1da177e4 LT |
1655 | break; |
1656 | ||
1657 | case SCTP_CMD_RTO_PENDING: | |
1658 | t = cmd->obj.transport; | |
1659 | t->rto_pending = 1; | |
1660 | break; | |
1661 | ||
1662 | case SCTP_CMD_PART_DELIVER: | |
b26ddd81 | 1663 | sctp_ulpq_partial_delivery(&asoc->ulpq, GFP_ATOMIC); |
1da177e4 LT |
1664 | break; |
1665 | ||
1666 | case SCTP_CMD_RENEGE: | |
b26ddd81 | 1667 | sctp_ulpq_renege(&asoc->ulpq, cmd->obj.chunk, |
1da177e4 LT |
1668 | GFP_ATOMIC); |
1669 | break; | |
1670 | ||
1671 | case SCTP_CMD_SETUP_T4: | |
b26ddd81 | 1672 | sctp_cmd_setup_t4(commands, asoc, cmd->obj.chunk); |
1da177e4 LT |
1673 | break; |
1674 | ||
1675 | case SCTP_CMD_PROCESS_OPERR: | |
1676 | sctp_cmd_process_operr(commands, asoc, chunk); | |
1677 | break; | |
1678 | case SCTP_CMD_CLEAR_INIT_TAG: | |
1679 | asoc->peer.i.init_tag = 0; | |
1680 | break; | |
1681 | case SCTP_CMD_DEL_NON_PRIMARY: | |
1682 | sctp_cmd_del_non_primary(asoc); | |
1683 | break; | |
1684 | case SCTP_CMD_T3_RTX_TIMERS_STOP: | |
1685 | sctp_cmd_t3_rtx_timers_stop(commands, asoc); | |
1686 | break; | |
1687 | case SCTP_CMD_FORCE_PRIM_RETRAN: | |
1688 | t = asoc->peer.retran_path; | |
1689 | asoc->peer.retran_path = asoc->peer.primary_path; | |
1690 | error = sctp_outq_uncork(&asoc->outqueue); | |
1691 | local_cork = 0; | |
1692 | asoc->peer.retran_path = t; | |
1693 | break; | |
8de8c873 SS |
1694 | case SCTP_CMD_SET_SK_ERR: |
1695 | sctp_cmd_set_sk_err(asoc, cmd->obj.error); | |
1696 | break; | |
07d93967 VY |
1697 | case SCTP_CMD_ASSOC_CHANGE: |
1698 | sctp_cmd_assoc_change(commands, asoc, | |
1699 | cmd->obj.u8); | |
1700 | break; | |
1701 | case SCTP_CMD_ADAPTATION_IND: | |
1702 | sctp_cmd_adaptation_ind(commands, asoc); | |
1703 | break; | |
1704 | ||
730fc3d0 VY |
1705 | case SCTP_CMD_ASSOC_SHKEY: |
1706 | error = sctp_auth_asoc_init_active_key(asoc, | |
1707 | GFP_ATOMIC); | |
1708 | break; | |
f4ad85ca GJ |
1709 | case SCTP_CMD_UPDATE_INITTAG: |
1710 | asoc->peer.i.init_tag = cmd->obj.u32; | |
1711 | break; | |
9c5c62be VY |
1712 | case SCTP_CMD_SEND_MSG: |
1713 | if (!asoc->outqueue.cork) { | |
1714 | sctp_outq_cork(&asoc->outqueue); | |
1715 | local_cork = 1; | |
1716 | } | |
1717 | error = sctp_cmd_send_msg(asoc, cmd->obj.msg); | |
1718 | break; | |
c0786693 VY |
1719 | case SCTP_CMD_SEND_NEXT_ASCONF: |
1720 | sctp_cmd_send_asconf(asoc); | |
1721 | break; | |
a000c01e WY |
1722 | case SCTP_CMD_PURGE_ASCONF_QUEUE: |
1723 | sctp_asconf_queue_teardown(asoc); | |
1724 | break; | |
d5ccd496 MM |
1725 | |
1726 | case SCTP_CMD_SET_ASOC: | |
1727 | asoc = cmd->obj.asoc; | |
1728 | break; | |
1729 | ||
1da177e4 | 1730 | default: |
b26ddd81 NH |
1731 | pr_warn("Impossible command: %u\n", |
1732 | cmd->verb); | |
1da177e4 | 1733 | break; |
3ff50b79 SH |
1734 | } |
1735 | ||
1da177e4 LT |
1736 | if (error) |
1737 | break; | |
1738 | } | |
1739 | ||
1740 | out: | |
2e3216cd VY |
1741 | /* If this is in response to a received chunk, wait until |
1742 | * we are done with the packet to open the queue so that we don't | |
1743 | * send multiple packets in response to a single request. | |
1744 | */ | |
1745 | if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) { | |
1746 | if (chunk->end_of_packet || chunk->singleton) | |
d4d6fb57 | 1747 | error = sctp_outq_uncork(&asoc->outqueue); |
2e3216cd | 1748 | } else if (local_cork) |
d4d6fb57 | 1749 | error = sctp_outq_uncork(&asoc->outqueue); |
1da177e4 LT |
1750 | return error; |
1751 | nomem: | |
1752 | error = -ENOMEM; | |
1753 | goto out; | |
1754 | } | |
1755 |