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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, | |
649621e3 | 66 | struct sctp_association **asoc, |
1da177e4 LT |
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 { |
07b4d6a1 MRL |
218 | __u32 old_a_rwnd = asoc->a_rwnd; |
219 | ||
90f2f531 | 220 | asoc->a_rwnd = asoc->rwnd; |
1da177e4 | 221 | sack = sctp_make_sack(asoc); |
07b4d6a1 MRL |
222 | if (!sack) { |
223 | asoc->a_rwnd = old_a_rwnd; | |
1da177e4 | 224 | goto nomem; |
07b4d6a1 | 225 | } |
1da177e4 LT |
226 | |
227 | asoc->peer.sack_needed = 0; | |
d364d927 | 228 | asoc->peer.sack_cnt = 0; |
1da177e4 | 229 | |
732ba35e | 230 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack)); |
1da177e4 LT |
231 | |
232 | /* Stop the SACK timer. */ | |
233 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
234 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
235 | } | |
52ccb8e9 | 236 | |
1da177e4 LT |
237 | return error; |
238 | nomem: | |
239 | error = -ENOMEM; | |
240 | return error; | |
241 | } | |
242 | ||
243 | /* When the T3-RTX timer expires, it calls this function to create the | |
244 | * relevant state machine event. | |
245 | */ | |
246 | void sctp_generate_t3_rtx_event(unsigned long peer) | |
247 | { | |
248 | int error; | |
249 | struct sctp_transport *transport = (struct sctp_transport *) peer; | |
250 | struct sctp_association *asoc = transport->asoc; | |
635682a1 KH |
251 | struct sock *sk = asoc->base.sk; |
252 | struct net *net = sock_net(sk); | |
1da177e4 LT |
253 | |
254 | /* Check whether a task is in the sock. */ | |
255 | ||
635682a1 KH |
256 | bh_lock_sock(sk); |
257 | if (sock_owned_by_user(sk)) { | |
bb33381d | 258 | pr_debug("%s: sock is busy\n", __func__); |
1da177e4 LT |
259 | |
260 | /* Try again later. */ | |
261 | if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20))) | |
262 | sctp_transport_hold(transport); | |
263 | goto out_unlock; | |
264 | } | |
265 | ||
1da177e4 | 266 | /* Run through the state machine. */ |
55e26eb9 | 267 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
268 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX), |
269 | asoc->state, | |
270 | asoc->ep, asoc, | |
271 | transport, GFP_ATOMIC); | |
272 | ||
273 | if (error) | |
635682a1 | 274 | sk->sk_err = -error; |
1da177e4 LT |
275 | |
276 | out_unlock: | |
635682a1 | 277 | bh_unlock_sock(sk); |
1da177e4 LT |
278 | sctp_transport_put(transport); |
279 | } | |
280 | ||
281 | /* This is a sa interface for producing timeout events. It works | |
282 | * for timeouts which use the association as their parameter. | |
283 | */ | |
284 | static void sctp_generate_timeout_event(struct sctp_association *asoc, | |
285 | sctp_event_timeout_t timeout_type) | |
286 | { | |
635682a1 KH |
287 | struct sock *sk = asoc->base.sk; |
288 | struct net *net = sock_net(sk); | |
1da177e4 LT |
289 | int error = 0; |
290 | ||
635682a1 KH |
291 | bh_lock_sock(sk); |
292 | if (sock_owned_by_user(sk)) { | |
bb33381d DB |
293 | pr_debug("%s: sock is busy: timer %d\n", __func__, |
294 | timeout_type); | |
1da177e4 LT |
295 | |
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. */ | |
55e26eb9 | 309 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
310 | SCTP_ST_TIMEOUT(timeout_type), |
311 | asoc->state, asoc->ep, asoc, | |
312 | (void *)timeout_type, GFP_ATOMIC); | |
313 | ||
314 | if (error) | |
635682a1 | 315 | sk->sk_err = -error; |
1da177e4 LT |
316 | |
317 | out_unlock: | |
635682a1 | 318 | bh_unlock_sock(sk); |
1da177e4 LT |
319 | sctp_association_put(asoc); |
320 | } | |
321 | ||
322 | static 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 | ||
328 | static 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 | ||
334 | static 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 | ||
340 | static 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 | ||
346 | static void sctp_generate_t5_shutdown_guard_event(unsigned long data) | |
347 | { | |
d808ad9a YH |
348 | struct sctp_association *asoc = (struct sctp_association *)data; |
349 | sctp_generate_timeout_event(asoc, | |
1da177e4 LT |
350 | SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD); |
351 | ||
352 | } /* sctp_generate_t5_shutdown_guard_event() */ | |
353 | ||
354 | static 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 | */ | |
363 | void 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; | |
635682a1 KH |
368 | struct sock *sk = asoc->base.sk; |
369 | struct net *net = sock_net(sk); | |
1da177e4 | 370 | |
635682a1 KH |
371 | bh_lock_sock(sk); |
372 | if (sock_owned_by_user(sk)) { | |
bb33381d | 373 | pr_debug("%s: sock is busy\n", __func__); |
1da177e4 LT |
374 | |
375 | /* Try again later. */ | |
376 | if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20))) | |
377 | sctp_transport_hold(transport); | |
378 | goto out_unlock; | |
379 | } | |
380 | ||
55e26eb9 | 381 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
382 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT), |
383 | asoc->state, asoc->ep, asoc, | |
384 | transport, GFP_ATOMIC); | |
385 | ||
f05940e6 | 386 | if (error) |
635682a1 | 387 | sk->sk_err = -error; |
1da177e4 LT |
388 | |
389 | out_unlock: | |
635682a1 | 390 | bh_unlock_sock(sk); |
1da177e4 LT |
391 | sctp_transport_put(transport); |
392 | } | |
393 | ||
50b5d6ad VY |
394 | /* Handle the timeout of the ICMP protocol unreachable timer. Trigger |
395 | * the correct state machine transition that will close the association. | |
396 | */ | |
397 | void sctp_generate_proto_unreach_event(unsigned long data) | |
398 | { | |
399 | struct sctp_transport *transport = (struct sctp_transport *) data; | |
400 | struct sctp_association *asoc = transport->asoc; | |
635682a1 KH |
401 | struct sock *sk = asoc->base.sk; |
402 | struct net *net = sock_net(sk); | |
cb3f837b | 403 | |
635682a1 KH |
404 | bh_lock_sock(sk); |
405 | if (sock_owned_by_user(sk)) { | |
bb33381d | 406 | pr_debug("%s: sock is busy\n", __func__); |
50b5d6ad VY |
407 | |
408 | /* Try again later. */ | |
409 | if (!mod_timer(&transport->proto_unreach_timer, | |
410 | jiffies + (HZ/20))) | |
411 | sctp_association_hold(asoc); | |
412 | goto out_unlock; | |
413 | } | |
414 | ||
415 | /* Is this structure just waiting around for us to actually | |
416 | * get destroyed? | |
417 | */ | |
418 | if (asoc->base.dead) | |
419 | goto out_unlock; | |
420 | ||
55e26eb9 | 421 | sctp_do_sm(net, SCTP_EVENT_T_OTHER, |
50b5d6ad VY |
422 | SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH), |
423 | asoc->state, asoc->ep, asoc, transport, GFP_ATOMIC); | |
424 | ||
425 | out_unlock: | |
635682a1 | 426 | bh_unlock_sock(sk); |
50b5d6ad VY |
427 | sctp_association_put(asoc); |
428 | } | |
429 | ||
430 | ||
1da177e4 LT |
431 | /* Inject a SACK Timeout event into the state machine. */ |
432 | static void sctp_generate_sack_event(unsigned long data) | |
433 | { | |
434 | struct sctp_association *asoc = (struct sctp_association *) data; | |
435 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK); | |
436 | } | |
437 | ||
438 | sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = { | |
439 | NULL, | |
440 | sctp_generate_t1_cookie_event, | |
441 | sctp_generate_t1_init_event, | |
442 | sctp_generate_t2_shutdown_event, | |
443 | NULL, | |
444 | sctp_generate_t4_rto_event, | |
445 | sctp_generate_t5_shutdown_guard_event, | |
1e7d3d90 | 446 | NULL, |
1da177e4 LT |
447 | sctp_generate_sack_event, |
448 | sctp_generate_autoclose_event, | |
449 | }; | |
450 | ||
451 | ||
452 | /* RFC 2960 8.2 Path Failure Detection | |
453 | * | |
454 | * When its peer endpoint is multi-homed, an endpoint should keep a | |
455 | * error counter for each of the destination transport addresses of the | |
456 | * peer endpoint. | |
457 | * | |
458 | * Each time the T3-rtx timer expires on any address, or when a | |
459 | * HEARTBEAT sent to an idle address is not acknowledged within a RTO, | |
460 | * the error counter of that destination address will be incremented. | |
461 | * When the value in the error counter exceeds the protocol parameter | |
462 | * 'Path.Max.Retrans' of that destination address, the endpoint should | |
463 | * mark the destination transport address as inactive, and a | |
464 | * notification SHOULD be sent to the upper layer. | |
465 | * | |
466 | */ | |
5aa93bcf NH |
467 | static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t *commands, |
468 | struct sctp_association *asoc, | |
7e99013a VY |
469 | struct sctp_transport *transport, |
470 | int is_hb) | |
1da177e4 | 471 | { |
566178f8 ZY |
472 | struct net *net = sock_net(asoc->base.sk); |
473 | ||
1da177e4 LT |
474 | /* The check for association's overall error counter exceeding the |
475 | * threshold is done in the state function. | |
476 | */ | |
b9f84786 VY |
477 | /* We are here due to a timer expiration. If the timer was |
478 | * not a HEARTBEAT, then normal error tracking is done. | |
479 | * If the timer was a heartbeat, we only increment error counts | |
480 | * when we already have an outstanding HEARTBEAT that has not | |
481 | * been acknowledged. | |
25985edc | 482 | * Additionally, some tranport states inhibit error increments. |
ad8fec17 | 483 | */ |
b9f84786 | 484 | if (!is_hb) { |
ad8fec17 | 485 | asoc->overall_error_count++; |
b9f84786 VY |
486 | if (transport->state != SCTP_INACTIVE) |
487 | transport->error_count++; | |
488 | } else if (transport->hb_sent) { | |
489 | if (transport->state != SCTP_UNCONFIRMED) | |
490 | asoc->overall_error_count++; | |
491 | if (transport->state != SCTP_INACTIVE) | |
492 | transport->error_count++; | |
493 | } | |
1da177e4 | 494 | |
5aa93bcf | 495 | /* If the transport error count is greater than the pf_retrans |
7cce3b75 | 496 | * threshold, and less than pathmaxrtx, and if the current state |
8c2eab90 KH |
497 | * is SCTP_ACTIVE, then mark this transport as Partially Failed, |
498 | * see SCTP Quick Failover Draft, section 5.1 | |
5aa93bcf | 499 | */ |
566178f8 ZY |
500 | if (net->sctp.pf_enable && |
501 | (transport->state == SCTP_ACTIVE) && | |
5aa93bcf NH |
502 | (asoc->pf_retrans < transport->pathmaxrxt) && |
503 | (transport->error_count > asoc->pf_retrans)) { | |
504 | ||
505 | sctp_assoc_control_transport(asoc, transport, | |
506 | SCTP_TRANSPORT_PF, | |
507 | 0); | |
508 | ||
509 | /* Update the hb timer to resend a heartbeat every rto */ | |
510 | sctp_cmd_hb_timer_update(commands, transport); | |
511 | } | |
512 | ||
3f7a87d2 | 513 | if (transport->state != SCTP_INACTIVE && |
b9f84786 | 514 | (transport->error_count > transport->pathmaxrxt)) { |
bb33381d DB |
515 | pr_debug("%s: association:%p transport addr:%pISpc failed\n", |
516 | __func__, asoc, &transport->ipaddr.sa); | |
517 | ||
1da177e4 LT |
518 | sctp_assoc_control_transport(asoc, transport, |
519 | SCTP_TRANSPORT_DOWN, | |
520 | SCTP_FAILED_THRESHOLD); | |
521 | } | |
522 | ||
523 | /* E2) For the destination address for which the timer | |
524 | * expires, set RTO <- RTO * 2 ("back off the timer"). The | |
525 | * maximum value discussed in rule C7 above (RTO.max) may be | |
526 | * used to provide an upper bound to this doubling operation. | |
faee47cd VY |
527 | * |
528 | * Special Case: the first HB doesn't trigger exponential backoff. | |
3ad2f3fb | 529 | * The first unacknowledged HB triggers it. We do this with a flag |
faee47cd | 530 | * that indicates that we have an outstanding HB. |
1da177e4 | 531 | */ |
7e99013a | 532 | if (!is_hb || transport->hb_sent) { |
faee47cd | 533 | transport->rto = min((transport->rto * 2), transport->asoc->rto_max); |
196d6759 | 534 | sctp_max_rto(asoc, transport); |
faee47cd | 535 | } |
1da177e4 LT |
536 | } |
537 | ||
538 | /* Worker routine to handle INIT command failure. */ | |
539 | static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands, | |
540 | struct sctp_association *asoc, | |
95c96174 | 541 | unsigned int error) |
1da177e4 LT |
542 | { |
543 | struct sctp_ulpevent *event; | |
544 | ||
cb3f837b | 545 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_CANT_STR_ASSOC, |
a5a35e76 | 546 | (__u16)error, 0, 0, NULL, |
1da177e4 LT |
547 | GFP_ATOMIC); |
548 | ||
549 | if (event) | |
550 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
551 | SCTP_ULPEVENT(event)); | |
552 | ||
553 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
554 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
555 | ||
556 | /* SEND_FAILED sent later when cleaning up the association. */ | |
557 | asoc->outqueue.error = error; | |
558 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
559 | } | |
560 | ||
561 | /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */ | |
562 | static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands, | |
563 | struct sctp_association *asoc, | |
564 | sctp_event_t event_type, | |
565 | sctp_subtype_t subtype, | |
566 | struct sctp_chunk *chunk, | |
95c96174 | 567 | unsigned int error) |
1da177e4 LT |
568 | { |
569 | struct sctp_ulpevent *event; | |
de4594a5 | 570 | struct sctp_chunk *abort; |
1da177e4 LT |
571 | /* Cancel any partial delivery in progress. */ |
572 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); | |
573 | ||
a5a35e76 VY |
574 | if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT) |
575 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
576 | (__u16)error, 0, 0, chunk, | |
577 | GFP_ATOMIC); | |
578 | else | |
579 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
580 | (__u16)error, 0, 0, NULL, | |
1da177e4 LT |
581 | GFP_ATOMIC); |
582 | if (event) | |
583 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
584 | SCTP_ULPEVENT(event)); | |
585 | ||
de4594a5 NH |
586 | if (asoc->overall_error_count >= asoc->max_retrans) { |
587 | abort = sctp_make_violation_max_retrans(asoc, chunk); | |
588 | if (abort) | |
589 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
590 | SCTP_CHUNK(abort)); | |
591 | } | |
592 | ||
1da177e4 LT |
593 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
594 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
595 | ||
1da177e4 LT |
596 | /* SEND_FAILED sent later when cleaning up the association. */ |
597 | asoc->outqueue.error = error; | |
598 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
599 | } | |
600 | ||
601 | /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT | |
602 | * inside the cookie. In reality, this is only used for INIT-ACK processing | |
603 | * since all other cases use "temporary" associations and can do all | |
604 | * their work in statefuns directly. | |
605 | */ | |
606 | static int sctp_cmd_process_init(sctp_cmd_seq_t *commands, | |
607 | struct sctp_association *asoc, | |
608 | struct sctp_chunk *chunk, | |
3182cd84 | 609 | sctp_init_chunk_t *peer_init, |
dd0fc66f | 610 | gfp_t gfp) |
1da177e4 LT |
611 | { |
612 | int error; | |
613 | ||
614 | /* We only process the init as a sideeffect in a single | |
615 | * case. This is when we process the INIT-ACK. If we | |
616 | * fail during INIT processing (due to malloc problems), | |
617 | * just return the error and stop processing the stack. | |
618 | */ | |
de6becdc | 619 | if (!sctp_process_init(asoc, chunk, sctp_source(chunk), peer_init, gfp)) |
1da177e4 LT |
620 | error = -ENOMEM; |
621 | else | |
622 | error = 0; | |
623 | ||
624 | return error; | |
625 | } | |
626 | ||
627 | /* Helper function to break out starting up of heartbeat timers. */ | |
628 | static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds, | |
629 | struct sctp_association *asoc) | |
630 | { | |
631 | struct sctp_transport *t; | |
1da177e4 LT |
632 | |
633 | /* Start a heartbeat timer for each transport on the association. | |
634 | * hold a reference on the transport to make sure none of | |
635 | * the needed data structures go away. | |
636 | */ | |
9dbc15f0 | 637 | list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) { |
1da177e4 LT |
638 | |
639 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) | |
640 | sctp_transport_hold(t); | |
641 | } | |
642 | } | |
643 | ||
644 | static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds, | |
645 | struct sctp_association *asoc) | |
646 | { | |
647 | struct sctp_transport *t; | |
1da177e4 LT |
648 | |
649 | /* Stop all heartbeat timers. */ | |
650 | ||
9dbc15f0 RD |
651 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
652 | transports) { | |
1da177e4 LT |
653 | if (del_timer(&t->hb_timer)) |
654 | sctp_transport_put(t); | |
655 | } | |
656 | } | |
657 | ||
658 | /* Helper function to stop any pending T3-RTX timers */ | |
659 | static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds, | |
d808ad9a | 660 | struct sctp_association *asoc) |
1da177e4 LT |
661 | { |
662 | struct sctp_transport *t; | |
1da177e4 | 663 | |
9dbc15f0 RD |
664 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
665 | transports) { | |
25cc4ae9 | 666 | if (del_timer(&t->T3_rtx_timer)) |
1da177e4 | 667 | sctp_transport_put(t); |
1da177e4 LT |
668 | } |
669 | } | |
670 | ||
671 | ||
672 | /* Helper function to update the heartbeat timer. */ | |
673 | static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds, | |
1da177e4 LT |
674 | struct sctp_transport *t) |
675 | { | |
676 | /* Update the heartbeat timer. */ | |
677 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) | |
678 | sctp_transport_hold(t); | |
679 | } | |
680 | ||
681 | /* Helper function to handle the reception of an HEARTBEAT ACK. */ | |
682 | static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds, | |
683 | struct sctp_association *asoc, | |
684 | struct sctp_transport *t, | |
685 | struct sctp_chunk *chunk) | |
686 | { | |
687 | sctp_sender_hb_info_t *hbinfo; | |
34d2d89f | 688 | int was_unconfirmed = 0; |
1da177e4 LT |
689 | |
690 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the | |
691 | * HEARTBEAT should clear the error counter of the destination | |
692 | * transport address to which the HEARTBEAT was sent. | |
1da177e4 LT |
693 | */ |
694 | t->error_count = 0; | |
f8d96052 TG |
695 | |
696 | /* | |
697 | * Although RFC4960 specifies that the overall error count must | |
698 | * be cleared when a HEARTBEAT ACK is received, we make an | |
699 | * exception while in SHUTDOWN PENDING. If the peer keeps its | |
700 | * window shut forever, we may never be able to transmit our | |
701 | * outstanding data and rely on the retransmission limit be reached | |
702 | * to shutdown the association. | |
703 | */ | |
f648f807 | 704 | if (t->asoc->state < SCTP_STATE_SHUTDOWN_PENDING) |
f8d96052 | 705 | t->asoc->overall_error_count = 0; |
1da177e4 | 706 | |
faee47cd VY |
707 | /* Clear the hb_sent flag to signal that we had a good |
708 | * acknowledgement. | |
709 | */ | |
710 | t->hb_sent = 0; | |
711 | ||
1da177e4 LT |
712 | /* Mark the destination transport address as active if it is not so |
713 | * marked. | |
714 | */ | |
34d2d89f MH |
715 | if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) { |
716 | was_unconfirmed = 1; | |
1da177e4 LT |
717 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, |
718 | SCTP_HEARTBEAT_SUCCESS); | |
34d2d89f | 719 | } |
1da177e4 | 720 | |
5aa93bcf NH |
721 | if (t->state == SCTP_PF) |
722 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, | |
723 | SCTP_HEARTBEAT_SUCCESS); | |
724 | ||
8c2f414a DB |
725 | /* HB-ACK was received for a the proper HB. Consider this |
726 | * forward progress. | |
727 | */ | |
728 | if (t->dst) | |
729 | dst_confirm(t->dst); | |
730 | ||
1da177e4 LT |
731 | /* The receiver of the HEARTBEAT ACK should also perform an |
732 | * RTT measurement for that destination transport address | |
733 | * using the time value carried in the HEARTBEAT ACK chunk. | |
e533ca16 VY |
734 | * If the transport's rto_pending variable has been cleared, |
735 | * it was most likely due to a retransmit. However, we want | |
736 | * to re-enable it to properly update the rto. | |
1da177e4 | 737 | */ |
e533ca16 VY |
738 | if (t->rto_pending == 0) |
739 | t->rto_pending = 1; | |
740 | ||
1da177e4 LT |
741 | hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data; |
742 | sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at)); | |
ad8fec17 SS |
743 | |
744 | /* Update the heartbeat timer. */ | |
745 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) | |
746 | sctp_transport_hold(t); | |
34d2d89f MH |
747 | |
748 | if (was_unconfirmed && asoc->peer.transport_count == 1) | |
749 | sctp_transport_immediate_rtx(t); | |
1da177e4 LT |
750 | } |
751 | ||
1da177e4 LT |
752 | |
753 | /* Helper function to process the process SACK command. */ | |
754 | static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds, | |
755 | struct sctp_association *asoc, | |
edfee033 | 756 | struct sctp_chunk *chunk) |
1da177e4 | 757 | { |
2e3216cd | 758 | int err = 0; |
1da177e4 | 759 | |
edfee033 | 760 | if (sctp_outq_sack(&asoc->outqueue, chunk)) { |
55e26eb9 EB |
761 | struct net *net = sock_net(asoc->base.sk); |
762 | ||
1da177e4 | 763 | /* There are no more TSNs awaiting SACK. */ |
55e26eb9 | 764 | err = sctp_do_sm(net, SCTP_EVENT_T_OTHER, |
1da177e4 LT |
765 | SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN), |
766 | asoc->state, asoc->ep, asoc, NULL, | |
767 | GFP_ATOMIC); | |
1da177e4 LT |
768 | } |
769 | ||
770 | return err; | |
771 | } | |
772 | ||
773 | /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set | |
774 | * the transport for a shutdown chunk. | |
775 | */ | |
d808ad9a | 776 | static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds, |
1da177e4 LT |
777 | struct sctp_association *asoc, |
778 | struct sctp_chunk *chunk) | |
779 | { | |
780 | struct sctp_transport *t; | |
781 | ||
c17b02b3 VY |
782 | if (chunk->transport) |
783 | t = chunk->transport; | |
784 | else { | |
785 | t = sctp_assoc_choose_alter_transport(asoc, | |
9919b455 | 786 | asoc->shutdown_last_sent_to); |
c17b02b3 VY |
787 | chunk->transport = t; |
788 | } | |
1da177e4 LT |
789 | asoc->shutdown_last_sent_to = t; |
790 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto; | |
1da177e4 LT |
791 | } |
792 | ||
793 | /* Helper function to change the state of an association. */ | |
d808ad9a | 794 | static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds, |
1da177e4 LT |
795 | struct sctp_association *asoc, |
796 | sctp_state_t state) | |
797 | { | |
798 | struct sock *sk = asoc->base.sk; | |
799 | ||
800 | asoc->state = state; | |
801 | ||
bb33381d | 802 | pr_debug("%s: asoc:%p[%s]\n", __func__, asoc, sctp_state_tbl[state]); |
3f7a87d2 | 803 | |
1da177e4 | 804 | if (sctp_style(sk, TCP)) { |
3f7a87d2 | 805 | /* Change the sk->sk_state of a TCP-style socket that has |
af901ca1 | 806 | * successfully completed a connect() call. |
1da177e4 LT |
807 | */ |
808 | if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED)) | |
809 | sk->sk_state = SCTP_SS_ESTABLISHED; | |
810 | ||
811 | /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */ | |
812 | if (sctp_state(asoc, SHUTDOWN_RECEIVED) && | |
813 | sctp_sstate(sk, ESTABLISHED)) | |
814 | sk->sk_shutdown |= RCV_SHUTDOWN; | |
815 | } | |
816 | ||
3f7a87d2 FF |
817 | if (sctp_state(asoc, COOKIE_WAIT)) { |
818 | /* Reset init timeouts since they may have been | |
819 | * increased due to timer expirations. | |
820 | */ | |
821 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = | |
1e7d3d90 | 822 | asoc->rto_initial; |
3f7a87d2 | 823 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = |
1e7d3d90 | 824 | asoc->rto_initial; |
3f7a87d2 FF |
825 | } |
826 | ||
1da177e4 LT |
827 | if (sctp_state(asoc, ESTABLISHED) || |
828 | sctp_state(asoc, CLOSED) || | |
829 | sctp_state(asoc, SHUTDOWN_RECEIVED)) { | |
830 | /* Wake up any processes waiting in the asoc's wait queue in | |
831 | * sctp_wait_for_connect() or sctp_wait_for_sndbuf(). | |
d808ad9a | 832 | */ |
1da177e4 LT |
833 | if (waitqueue_active(&asoc->wait)) |
834 | wake_up_interruptible(&asoc->wait); | |
835 | ||
836 | /* Wake up any processes waiting in the sk's sleep queue of | |
837 | * a TCP-style or UDP-style peeled-off socket in | |
838 | * sctp_wait_for_accept() or sctp_wait_for_packet(). | |
839 | * For a UDP-style socket, the waiters are woken up by the | |
840 | * notifications. | |
841 | */ | |
842 | if (!sctp_style(sk, UDP)) | |
843 | sk->sk_state_change(sk); | |
844 | } | |
845 | } | |
846 | ||
847 | /* Helper function to delete an association. */ | |
848 | static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds, | |
849 | struct sctp_association *asoc) | |
850 | { | |
851 | struct sock *sk = asoc->base.sk; | |
852 | ||
853 | /* If it is a non-temporary association belonging to a TCP-style | |
d808ad9a | 854 | * listening socket that is not closed, do not free it so that accept() |
1da177e4 | 855 | * can pick it up later. |
d808ad9a | 856 | */ |
1da177e4 LT |
857 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) && |
858 | (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK)) | |
859 | return; | |
860 | ||
1da177e4 LT |
861 | sctp_association_free(asoc); |
862 | } | |
863 | ||
864 | /* | |
865 | * ADDIP Section 4.1 ASCONF Chunk Procedures | |
866 | * A4) Start a T-4 RTO timer, using the RTO value of the selected | |
867 | * destination address (we use active path instead of primary path just | |
d808ad9a | 868 | * because primary path may be inactive. |
1da177e4 LT |
869 | */ |
870 | static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds, | |
871 | struct sctp_association *asoc, | |
872 | struct sctp_chunk *chunk) | |
873 | { | |
874 | struct sctp_transport *t; | |
875 | ||
9919b455 | 876 | t = sctp_assoc_choose_alter_transport(asoc, chunk->transport); |
1da177e4 LT |
877 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto; |
878 | chunk->transport = t; | |
879 | } | |
880 | ||
d808ad9a | 881 | /* Process an incoming Operation Error Chunk. */ |
1da177e4 LT |
882 | static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds, |
883 | struct sctp_association *asoc, | |
884 | struct sctp_chunk *chunk) | |
885 | { | |
1da177e4 | 886 | struct sctp_errhdr *err_hdr; |
3df26787 WY |
887 | struct sctp_ulpevent *ev; |
888 | ||
889 | while (chunk->chunk_end > chunk->skb->data) { | |
890 | err_hdr = (struct sctp_errhdr *)(chunk->skb->data); | |
891 | ||
892 | ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0, | |
893 | GFP_ATOMIC); | |
894 | if (!ev) | |
895 | return; | |
896 | ||
897 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
898 | ||
899 | switch (err_hdr->cause) { | |
900 | case SCTP_ERROR_UNKNOWN_CHUNK: | |
901 | { | |
902 | sctp_chunkhdr_t *unk_chunk_hdr; | |
903 | ||
904 | unk_chunk_hdr = (sctp_chunkhdr_t *)err_hdr->variable; | |
905 | switch (unk_chunk_hdr->type) { | |
906 | /* ADDIP 4.1 A9) If the peer responds to an ASCONF with | |
907 | * an ERROR chunk reporting that it did not recognized | |
908 | * the ASCONF chunk type, the sender of the ASCONF MUST | |
909 | * NOT send any further ASCONF chunks and MUST stop its | |
910 | * T-4 timer. | |
911 | */ | |
912 | case SCTP_CID_ASCONF: | |
913 | if (asoc->peer.asconf_capable == 0) | |
914 | break; | |
915 | ||
916 | asoc->peer.asconf_capable = 0; | |
917 | sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP, | |
1da177e4 | 918 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); |
3df26787 WY |
919 | break; |
920 | default: | |
921 | break; | |
922 | } | |
1da177e4 | 923 | break; |
3df26787 | 924 | } |
1da177e4 LT |
925 | default: |
926 | break; | |
927 | } | |
1da177e4 LT |
928 | } |
929 | } | |
930 | ||
931 | /* Process variable FWDTSN chunk information. */ | |
d808ad9a | 932 | static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq, |
1da177e4 LT |
933 | struct sctp_chunk *chunk) |
934 | { | |
935 | struct sctp_fwdtsn_skip *skip; | |
936 | /* Walk through all the skipped SSNs */ | |
937 | sctp_walk_fwdtsn(skip, chunk) { | |
938 | sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn)); | |
939 | } | |
1da177e4 LT |
940 | } |
941 | ||
d808ad9a | 942 | /* Helper function to remove the association non-primary peer |
1da177e4 | 943 | * transports. |
d808ad9a | 944 | */ |
1da177e4 LT |
945 | static void sctp_cmd_del_non_primary(struct sctp_association *asoc) |
946 | { | |
947 | struct sctp_transport *t; | |
948 | struct list_head *pos; | |
949 | struct list_head *temp; | |
950 | ||
951 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
952 | t = list_entry(pos, struct sctp_transport, transports); | |
5f242a13 | 953 | if (!sctp_cmp_addr_exact(&t->ipaddr, |
d808ad9a | 954 | &asoc->peer.primary_addr)) { |
73e67420 | 955 | sctp_assoc_rm_peer(asoc, t); |
1da177e4 LT |
956 | } |
957 | } | |
1da177e4 LT |
958 | } |
959 | ||
8de8c873 SS |
960 | /* Helper function to set sk_err on a 1-1 style socket. */ |
961 | static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error) | |
962 | { | |
963 | struct sock *sk = asoc->base.sk; | |
964 | ||
965 | if (!sctp_style(sk, UDP)) | |
966 | sk->sk_err = error; | |
967 | } | |
968 | ||
07d93967 VY |
969 | /* Helper function to generate an association change event */ |
970 | static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands, | |
971 | struct sctp_association *asoc, | |
972 | u8 state) | |
973 | { | |
974 | struct sctp_ulpevent *ev; | |
975 | ||
976 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0, | |
977 | asoc->c.sinit_num_ostreams, | |
978 | asoc->c.sinit_max_instreams, | |
979 | NULL, GFP_ATOMIC); | |
980 | if (ev) | |
981 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
982 | } | |
983 | ||
984 | /* Helper function to generate an adaptation indication event */ | |
985 | static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands, | |
986 | struct sctp_association *asoc) | |
987 | { | |
988 | struct sctp_ulpevent *ev; | |
989 | ||
990 | ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); | |
991 | ||
992 | if (ev) | |
993 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
994 | } | |
995 | ||
96cd0d3d VY |
996 | |
997 | static void sctp_cmd_t1_timer_update(struct sctp_association *asoc, | |
998 | sctp_event_timeout_t timer, | |
999 | char *name) | |
1000 | { | |
1001 | struct sctp_transport *t; | |
1002 | ||
1003 | t = asoc->init_last_sent_to; | |
1004 | asoc->init_err_counter++; | |
1005 | ||
1006 | if (t->init_sent_count > (asoc->init_cycle + 1)) { | |
1007 | asoc->timeouts[timer] *= 2; | |
1008 | if (asoc->timeouts[timer] > asoc->max_init_timeo) { | |
1009 | asoc->timeouts[timer] = asoc->max_init_timeo; | |
1010 | } | |
1011 | asoc->init_cycle++; | |
bb33381d DB |
1012 | |
1013 | pr_debug("%s: T1[%s] timeout adjustment init_err_counter:%d" | |
1014 | " cycle:%d timeout:%ld\n", __func__, name, | |
1015 | asoc->init_err_counter, asoc->init_cycle, | |
1016 | asoc->timeouts[timer]); | |
96cd0d3d VY |
1017 | } |
1018 | ||
1019 | } | |
1020 | ||
9c5c62be VY |
1021 | /* Send the whole message, chunk by chunk, to the outqueue. |
1022 | * This way the whole message is queued up and bundling if | |
1023 | * encouraged for small fragments. | |
1024 | */ | |
1025 | static int sctp_cmd_send_msg(struct sctp_association *asoc, | |
cea8768f | 1026 | struct sctp_datamsg *msg, gfp_t gfp) |
9c5c62be VY |
1027 | { |
1028 | struct sctp_chunk *chunk; | |
1029 | int error = 0; | |
1030 | ||
1031 | list_for_each_entry(chunk, &msg->chunks, frag_list) { | |
cea8768f | 1032 | error = sctp_outq_tail(&asoc->outqueue, chunk, gfp); |
9c5c62be VY |
1033 | if (error) |
1034 | break; | |
1035 | } | |
1036 | ||
1037 | return error; | |
1038 | } | |
1039 | ||
1040 | ||
c0786693 VY |
1041 | /* Sent the next ASCONF packet currently stored in the association. |
1042 | * This happens after the ASCONF_ACK was succeffully processed. | |
1043 | */ | |
1044 | static void sctp_cmd_send_asconf(struct sctp_association *asoc) | |
1045 | { | |
55e26eb9 EB |
1046 | struct net *net = sock_net(asoc->base.sk); |
1047 | ||
c0786693 VY |
1048 | /* Send the next asconf chunk from the addip chunk |
1049 | * queue. | |
1050 | */ | |
1051 | if (!list_empty(&asoc->addip_chunk_list)) { | |
1052 | struct list_head *entry = asoc->addip_chunk_list.next; | |
1053 | struct sctp_chunk *asconf = list_entry(entry, | |
1054 | struct sctp_chunk, list); | |
1055 | list_del_init(entry); | |
1056 | ||
1057 | /* Hold the chunk until an ASCONF_ACK is received. */ | |
1058 | sctp_chunk_hold(asconf); | |
55e26eb9 | 1059 | if (sctp_primitive_ASCONF(net, asoc, asconf)) |
c0786693 VY |
1060 | sctp_chunk_free(asconf); |
1061 | else | |
1062 | asoc->addip_last_asconf = asconf; | |
1063 | } | |
1064 | } | |
1065 | ||
9c5c62be | 1066 | |
1da177e4 LT |
1067 | /* These three macros allow us to pull the debugging code out of the |
1068 | * main flow of sctp_do_sm() to keep attention focused on the real | |
1069 | * functionality there. | |
1070 | */ | |
bb33381d DB |
1071 | #define debug_pre_sfn() \ |
1072 | pr_debug("%s[pre-fn]: ep:%p, %s, %s, asoc:%p[%s], %s\n", __func__, \ | |
1073 | ep, sctp_evttype_tbl[event_type], (*debug_fn)(subtype), \ | |
1074 | asoc, sctp_state_tbl[state], state_fn->name) | |
1075 | ||
1076 | #define debug_post_sfn() \ | |
1077 | pr_debug("%s[post-fn]: asoc:%p, status:%s\n", __func__, asoc, \ | |
1078 | sctp_status_tbl[status]) | |
1079 | ||
1080 | #define debug_post_sfx() \ | |
1081 | pr_debug("%s[post-sfx]: error:%d, asoc:%p[%s]\n", __func__, error, \ | |
1082 | asoc, sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \ | |
1083 | sctp_assoc2id(asoc))) ? asoc->state : SCTP_STATE_CLOSED]) | |
1da177e4 LT |
1084 | |
1085 | /* | |
1086 | * This is the master state machine processing function. | |
1087 | * | |
1088 | * If you want to understand all of lksctp, this is a | |
1089 | * good place to start. | |
1090 | */ | |
55e26eb9 | 1091 | int sctp_do_sm(struct net *net, sctp_event_t event_type, sctp_subtype_t subtype, |
1da177e4 LT |
1092 | sctp_state_t state, |
1093 | struct sctp_endpoint *ep, | |
1094 | struct sctp_association *asoc, | |
1095 | void *event_arg, | |
dd0fc66f | 1096 | gfp_t gfp) |
1da177e4 LT |
1097 | { |
1098 | sctp_cmd_seq_t commands; | |
1099 | const sctp_sm_table_entry_t *state_fn; | |
1100 | sctp_disposition_t status; | |
1101 | int error = 0; | |
1102 | typedef const char *(printfn_t)(sctp_subtype_t); | |
1da177e4 LT |
1103 | static printfn_t *table[] = { |
1104 | NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname, | |
1105 | }; | |
1106 | printfn_t *debug_fn __attribute__ ((unused)) = table[event_type]; | |
1107 | ||
1108 | /* Look up the state function, run it, and then process the | |
1109 | * side effects. These three steps are the heart of lksctp. | |
1110 | */ | |
55e26eb9 | 1111 | state_fn = sctp_sm_lookup_event(net, event_type, state, subtype); |
1da177e4 LT |
1112 | |
1113 | sctp_init_cmd_seq(&commands); | |
1114 | ||
bb33381d | 1115 | debug_pre_sfn(); |
131334d0 | 1116 | status = state_fn->fn(net, ep, asoc, subtype, event_arg, &commands); |
bb33381d | 1117 | debug_post_sfn(); |
1da177e4 LT |
1118 | |
1119 | error = sctp_side_effects(event_type, subtype, state, | |
649621e3 | 1120 | ep, &asoc, event_arg, status, |
1da177e4 | 1121 | &commands, gfp); |
bb33381d | 1122 | debug_post_sfx(); |
1da177e4 LT |
1123 | |
1124 | return error; | |
1125 | } | |
1126 | ||
1da177e4 LT |
1127 | /***************************************************************** |
1128 | * This the master state function side effect processing function. | |
1129 | *****************************************************************/ | |
1130 | static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, | |
1131 | sctp_state_t state, | |
1132 | struct sctp_endpoint *ep, | |
649621e3 | 1133 | struct sctp_association **asoc, |
1da177e4 LT |
1134 | void *event_arg, |
1135 | sctp_disposition_t status, | |
1136 | sctp_cmd_seq_t *commands, | |
dd0fc66f | 1137 | gfp_t gfp) |
1da177e4 LT |
1138 | { |
1139 | int error; | |
1140 | ||
1141 | /* FIXME - Most of the dispositions left today would be categorized | |
1142 | * as "exceptional" dispositions. For those dispositions, it | |
1143 | * may not be proper to run through any of the commands at all. | |
1144 | * For example, the command interpreter might be run only with | |
1145 | * disposition SCTP_DISPOSITION_CONSUME. | |
1146 | */ | |
1147 | if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state, | |
649621e3 | 1148 | ep, *asoc, |
1da177e4 LT |
1149 | event_arg, status, |
1150 | commands, gfp))) | |
1151 | goto bail; | |
1152 | ||
1153 | switch (status) { | |
1154 | case SCTP_DISPOSITION_DISCARD: | |
bb33381d DB |
1155 | pr_debug("%s: ignored sctp protocol event - state:%d, " |
1156 | "event_type:%d, event_id:%d\n", __func__, state, | |
1157 | event_type, subtype.chunk); | |
1da177e4 LT |
1158 | break; |
1159 | ||
1160 | case SCTP_DISPOSITION_NOMEM: | |
1161 | /* We ran out of memory, so we need to discard this | |
1162 | * packet. | |
1163 | */ | |
1164 | /* BUG--we should now recover some memory, probably by | |
1165 | * reneging... | |
1166 | */ | |
1167 | error = -ENOMEM; | |
1168 | break; | |
1169 | ||
d808ad9a | 1170 | case SCTP_DISPOSITION_DELETE_TCB: |
649621e3 | 1171 | case SCTP_DISPOSITION_ABORT: |
1da177e4 | 1172 | /* This should now be a command. */ |
649621e3 | 1173 | *asoc = NULL; |
1da177e4 LT |
1174 | break; |
1175 | ||
1176 | case SCTP_DISPOSITION_CONSUME: | |
1da177e4 LT |
1177 | /* |
1178 | * We should no longer have much work to do here as the | |
1179 | * real work has been done as explicit commands above. | |
1180 | */ | |
1181 | break; | |
1182 | ||
1183 | case SCTP_DISPOSITION_VIOLATION: | |
e87cc472 JP |
1184 | net_err_ratelimited("protocol violation state %d chunkid %d\n", |
1185 | state, subtype.chunk); | |
1da177e4 LT |
1186 | break; |
1187 | ||
1188 | case SCTP_DISPOSITION_NOT_IMPL: | |
145ce502 JP |
1189 | pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n", |
1190 | state, event_type, subtype.chunk); | |
1da177e4 LT |
1191 | break; |
1192 | ||
1193 | case SCTP_DISPOSITION_BUG: | |
145ce502 | 1194 | pr_err("bug in state %d, event_type %d, event_id %d\n", |
1da177e4 LT |
1195 | state, event_type, subtype.chunk); |
1196 | BUG(); | |
1197 | break; | |
1198 | ||
1199 | default: | |
145ce502 | 1200 | pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n", |
1da177e4 LT |
1201 | status, state, event_type, subtype.chunk); |
1202 | BUG(); | |
1203 | break; | |
3ff50b79 | 1204 | } |
1da177e4 LT |
1205 | |
1206 | bail: | |
1207 | return error; | |
1208 | } | |
1209 | ||
1210 | /******************************************************************** | |
1211 | * 2nd Level Abstractions | |
1212 | ********************************************************************/ | |
1213 | ||
1214 | /* This is the side-effect interpreter. */ | |
1215 | static int sctp_cmd_interpreter(sctp_event_t event_type, | |
1216 | sctp_subtype_t subtype, | |
1217 | sctp_state_t state, | |
1218 | struct sctp_endpoint *ep, | |
1219 | struct sctp_association *asoc, | |
1220 | void *event_arg, | |
d808ad9a | 1221 | sctp_disposition_t status, |
1da177e4 | 1222 | sctp_cmd_seq_t *commands, |
dd0fc66f | 1223 | gfp_t gfp) |
1da177e4 | 1224 | { |
fb586f25 MRL |
1225 | struct sock *sk = ep->base.sk; |
1226 | struct sctp_sock *sp = sctp_sk(sk); | |
1da177e4 LT |
1227 | int error = 0; |
1228 | int force; | |
1229 | sctp_cmd_t *cmd; | |
1230 | struct sctp_chunk *new_obj; | |
1231 | struct sctp_chunk *chunk = NULL; | |
1232 | struct sctp_packet *packet; | |
1da177e4 LT |
1233 | struct timer_list *timer; |
1234 | unsigned long timeout; | |
1235 | struct sctp_transport *t; | |
1236 | struct sctp_sackhdr sackh; | |
1237 | int local_cork = 0; | |
1238 | ||
1239 | if (SCTP_EVENT_T_TIMEOUT != event_type) | |
ea110733 | 1240 | chunk = event_arg; |
1da177e4 LT |
1241 | |
1242 | /* Note: This whole file is a huge candidate for rework. | |
1243 | * For example, each command could either have its own handler, so | |
1244 | * the loop would look like: | |
1245 | * while (cmds) | |
1246 | * cmd->handle(x, y, z) | |
1247 | * --jgrimm | |
1248 | */ | |
1249 | while (NULL != (cmd = sctp_next_cmd(commands))) { | |
1250 | switch (cmd->verb) { | |
1251 | case SCTP_CMD_NOP: | |
1252 | /* Do nothing. */ | |
1253 | break; | |
1254 | ||
1255 | case SCTP_CMD_NEW_ASOC: | |
1256 | /* Register a new association. */ | |
1257 | if (local_cork) { | |
cea8768f | 1258 | sctp_outq_uncork(&asoc->outqueue, gfp); |
1da177e4 LT |
1259 | local_cork = 0; |
1260 | } | |
f9e42b85 | 1261 | |
1da177e4 | 1262 | /* Register with the endpoint. */ |
f9e42b85 DB |
1263 | asoc = cmd->obj.asoc; |
1264 | BUG_ON(asoc->peer.primary_path == NULL); | |
1da177e4 | 1265 | sctp_endpoint_add_asoc(ep, asoc); |
1da177e4 LT |
1266 | break; |
1267 | ||
1268 | case SCTP_CMD_UPDATE_ASSOC: | |
b26ddd81 | 1269 | sctp_assoc_update(asoc, cmd->obj.asoc); |
1da177e4 LT |
1270 | break; |
1271 | ||
1272 | case SCTP_CMD_PURGE_OUTQUEUE: | |
1273 | sctp_outq_teardown(&asoc->outqueue); | |
1274 | break; | |
1275 | ||
d808ad9a | 1276 | case SCTP_CMD_DELETE_TCB: |
1da177e4 | 1277 | if (local_cork) { |
cea8768f | 1278 | sctp_outq_uncork(&asoc->outqueue, gfp); |
1da177e4 LT |
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. */ | |
8e1ee18c | 1293 | error = sctp_tsnmap_mark(&asoc->peer.tsn_map, |
4244854d | 1294 | cmd->obj.u32, NULL); |
1da177e4 LT |
1295 | 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 | ||
ea2dfb37 VY |
1301 | /* purge the fragmentation queue */ |
1302 | sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32); | |
1303 | ||
1da177e4 LT |
1304 | /* Abort any in progress partial delivery. */ |
1305 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); | |
1306 | break; | |
1307 | ||
1308 | case SCTP_CMD_PROCESS_FWDTSN: | |
b26ddd81 | 1309 | sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.chunk); |
d808ad9a | 1310 | break; |
1da177e4 LT |
1311 | |
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, | |
b26ddd81 | 1325 | cmd->obj.chunk); |
1da177e4 LT |
1326 | 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, | |
b26ddd81 | 1346 | cmd->obj.init, gfp); |
1da177e4 LT |
1347 | 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) { | |
b26ddd81 NH |
1353 | if (cmd->obj.chunk) |
1354 | sctp_chunk_free(cmd->obj.chunk); | |
1da177e4 LT |
1355 | 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 | */ | |
b26ddd81 | 1363 | if (cmd->obj.chunk) |
1da177e4 | 1364 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
b26ddd81 | 1365 | SCTP_CHUNK(cmd->obj.chunk)); |
1da177e4 | 1366 | |
96cd0d3d VY |
1367 | if (new_obj->transport) { |
1368 | new_obj->transport->init_sent_count++; | |
1369 | asoc->init_last_sent_to = new_obj->transport; | |
1370 | } | |
1371 | ||
1da177e4 | 1372 | /* FIXME - Eventually come up with a cleaner way to |
d808ad9a YH |
1373 | * 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 | |
1da177e4 LT |
1379 | * 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 | */ | |
3f7a87d2 FF |
1384 | if ((asoc->peer.retran_path != |
1385 | asoc->peer.primary_path) && | |
1386 | (asoc->init_err_counter > 0)) { | |
1387 | sctp_add_cmd_sf(commands, | |
d808ad9a | 1388 | SCTP_CMD_FORCE_PRIM_RETRAN, |
1da177e4 LT |
1389 | 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. */ | |
bb33381d DB |
1410 | pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n", |
1411 | __func__, cmd->obj.chunk, &asoc->ulpq); | |
1412 | ||
b26ddd81 | 1413 | sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.chunk, |
1da177e4 LT |
1414 | GFP_ATOMIC); |
1415 | break; | |
1416 | ||
1417 | case SCTP_CMD_EVENT_ULP: | |
1418 | /* Send a notification to the sockets layer. */ | |
bb33381d DB |
1419 | pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n", |
1420 | __func__, cmd->obj.ulpevent, &asoc->ulpq); | |
1421 | ||
b26ddd81 | 1422 | sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ulpevent); |
1da177e4 LT |
1423 | 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. */ | |
cea8768f MRL |
1432 | error = sctp_outq_tail(&asoc->outqueue, cmd->obj.chunk, |
1433 | gfp); | |
1da177e4 LT |
1434 | break; |
1435 | ||
1436 | case SCTP_CMD_SEND_PKT: | |
1437 | /* Send a full packet to our peer. */ | |
b26ddd81 | 1438 | packet = cmd->obj.packet; |
cea8768f | 1439 | sctp_packet_transmit(packet, gfp); |
1da177e4 LT |
1440 | sctp_ootb_pkt_free(packet); |
1441 | break; | |
1442 | ||
b6157d8e VY |
1443 | case SCTP_CMD_T1_RETRAN: |
1444 | /* Mark a transport for retransmission. */ | |
1445 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1446 | SCTP_RTXR_T1_RTX); | |
1447 | break; | |
1448 | ||
1da177e4 LT |
1449 | case SCTP_CMD_RETRAN: |
1450 | /* Mark a transport for retransmission. */ | |
1451 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1452 | SCTP_RTXR_T3_RTX); | |
1453 | break; | |
1454 | ||
1da177e4 LT |
1455 | case SCTP_CMD_ECN_CE: |
1456 | /* Do delayed CE processing. */ | |
1457 | sctp_do_ecn_ce_work(asoc, cmd->obj.u32); | |
1458 | break; | |
1459 | ||
1460 | case SCTP_CMD_ECN_ECNE: | |
1461 | /* Do delayed ECNE processing. */ | |
1462 | new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32, | |
1463 | chunk); | |
1464 | if (new_obj) | |
1465 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1466 | SCTP_CHUNK(new_obj)); | |
1467 | break; | |
1468 | ||
1469 | case SCTP_CMD_ECN_CWR: | |
1470 | /* Do delayed CWR processing. */ | |
1471 | sctp_do_ecn_cwr_work(asoc, cmd->obj.u32); | |
1472 | break; | |
1473 | ||
1474 | case SCTP_CMD_SETUP_T2: | |
b26ddd81 | 1475 | sctp_cmd_setup_t2(commands, asoc, cmd->obj.chunk); |
1da177e4 LT |
1476 | break; |
1477 | ||
f8d96052 TG |
1478 | case SCTP_CMD_TIMER_START_ONCE: |
1479 | timer = &asoc->timers[cmd->obj.to]; | |
1480 | ||
1481 | if (timer_pending(timer)) | |
1482 | break; | |
1483 | /* fall through */ | |
1484 | ||
1da177e4 LT |
1485 | case SCTP_CMD_TIMER_START: |
1486 | timer = &asoc->timers[cmd->obj.to]; | |
1487 | timeout = asoc->timeouts[cmd->obj.to]; | |
09a62660 | 1488 | BUG_ON(!timeout); |
1da177e4 LT |
1489 | |
1490 | timer->expires = jiffies + timeout; | |
1491 | sctp_association_hold(asoc); | |
1492 | add_timer(timer); | |
1493 | break; | |
1494 | ||
1495 | case SCTP_CMD_TIMER_RESTART: | |
1496 | timer = &asoc->timers[cmd->obj.to]; | |
1497 | timeout = asoc->timeouts[cmd->obj.to]; | |
1498 | if (!mod_timer(timer, jiffies + timeout)) | |
1499 | sctp_association_hold(asoc); | |
1500 | break; | |
1501 | ||
1502 | case SCTP_CMD_TIMER_STOP: | |
1503 | timer = &asoc->timers[cmd->obj.to]; | |
25cc4ae9 | 1504 | if (del_timer(timer)) |
1da177e4 LT |
1505 | sctp_association_put(asoc); |
1506 | break; | |
1507 | ||
3f7a87d2 | 1508 | case SCTP_CMD_INIT_CHOOSE_TRANSPORT: |
b26ddd81 | 1509 | chunk = cmd->obj.chunk; |
9919b455 WY |
1510 | t = sctp_assoc_choose_alter_transport(asoc, |
1511 | asoc->init_last_sent_to); | |
3f7a87d2 FF |
1512 | asoc->init_last_sent_to = t; |
1513 | chunk->transport = t; | |
1514 | t->init_sent_count++; | |
e0e9db17 VY |
1515 | /* Set the new transport as primary */ |
1516 | sctp_assoc_set_primary(asoc, t); | |
3f7a87d2 FF |
1517 | break; |
1518 | ||
1da177e4 LT |
1519 | case SCTP_CMD_INIT_RESTART: |
1520 | /* Do the needed accounting and updates | |
1521 | * associated with restarting an initialization | |
3f7a87d2 FF |
1522 | * timer. Only multiply the timeout by two if |
1523 | * all transports have been tried at the current | |
1524 | * timeout. | |
1525 | */ | |
96cd0d3d VY |
1526 | sctp_cmd_t1_timer_update(asoc, |
1527 | SCTP_EVENT_TIMEOUT_T1_INIT, | |
1528 | "INIT"); | |
3f7a87d2 FF |
1529 | |
1530 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
1531 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
1532 | break; | |
1533 | ||
1534 | case SCTP_CMD_COOKIEECHO_RESTART: | |
1535 | /* Do the needed accounting and updates | |
1536 | * associated with restarting an initialization | |
1537 | * timer. Only multiply the timeout by two if | |
1538 | * all transports have been tried at the current | |
1539 | * timeout. | |
1da177e4 | 1540 | */ |
96cd0d3d VY |
1541 | sctp_cmd_t1_timer_update(asoc, |
1542 | SCTP_EVENT_TIMEOUT_T1_COOKIE, | |
1543 | "COOKIE"); | |
1da177e4 LT |
1544 | |
1545 | /* If we've sent any data bundled with | |
1546 | * COOKIE-ECHO we need to resend. | |
1547 | */ | |
9dbc15f0 RD |
1548 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1549 | transports) { | |
b6157d8e VY |
1550 | sctp_retransmit_mark(&asoc->outqueue, t, |
1551 | SCTP_RTXR_T1_RTX); | |
1da177e4 LT |
1552 | } |
1553 | ||
1554 | sctp_add_cmd_sf(commands, | |
1555 | SCTP_CMD_TIMER_RESTART, | |
3f7a87d2 | 1556 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); |
1da177e4 LT |
1557 | break; |
1558 | ||
1559 | case SCTP_CMD_INIT_FAILED: | |
dc251b2b | 1560 | sctp_cmd_init_failed(commands, asoc, cmd->obj.err); |
1da177e4 LT |
1561 | break; |
1562 | ||
1563 | case SCTP_CMD_ASSOC_FAILED: | |
1564 | sctp_cmd_assoc_failed(commands, asoc, event_type, | |
5be291fe | 1565 | subtype, chunk, cmd->obj.err); |
1da177e4 LT |
1566 | break; |
1567 | ||
3f7a87d2 FF |
1568 | case SCTP_CMD_INIT_COUNTER_INC: |
1569 | asoc->init_err_counter++; | |
1da177e4 LT |
1570 | break; |
1571 | ||
3f7a87d2 FF |
1572 | case SCTP_CMD_INIT_COUNTER_RESET: |
1573 | asoc->init_err_counter = 0; | |
1574 | asoc->init_cycle = 0; | |
96cd0d3d VY |
1575 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1576 | transports) { | |
1577 | t->init_sent_count = 0; | |
1578 | } | |
1da177e4 LT |
1579 | break; |
1580 | ||
1581 | case SCTP_CMD_REPORT_DUP: | |
1582 | sctp_tsnmap_mark_dup(&asoc->peer.tsn_map, | |
1583 | cmd->obj.u32); | |
1584 | break; | |
1585 | ||
1586 | case SCTP_CMD_REPORT_BAD_TAG: | |
bb33381d | 1587 | pr_debug("%s: vtag mismatch!\n", __func__); |
1da177e4 LT |
1588 | break; |
1589 | ||
1590 | case SCTP_CMD_STRIKE: | |
1591 | /* Mark one strike against a transport. */ | |
5aa93bcf NH |
1592 | sctp_do_8_2_transport_strike(commands, asoc, |
1593 | cmd->obj.transport, 0); | |
7e99013a VY |
1594 | break; |
1595 | ||
1596 | case SCTP_CMD_TRANSPORT_IDLE: | |
1597 | t = cmd->obj.transport; | |
1598 | sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE); | |
1da177e4 LT |
1599 | break; |
1600 | ||
7e99013a | 1601 | case SCTP_CMD_TRANSPORT_HB_SENT: |
1da177e4 | 1602 | t = cmd->obj.transport; |
5aa93bcf NH |
1603 | sctp_do_8_2_transport_strike(commands, asoc, |
1604 | t, 1); | |
7e99013a | 1605 | t->hb_sent = 1; |
1da177e4 LT |
1606 | break; |
1607 | ||
1608 | case SCTP_CMD_TRANSPORT_ON: | |
1609 | t = cmd->obj.transport; | |
1610 | sctp_cmd_transport_on(commands, asoc, t, chunk); | |
1611 | break; | |
1612 | ||
1613 | case SCTP_CMD_HB_TIMERS_START: | |
1614 | sctp_cmd_hb_timers_start(commands, asoc); | |
1615 | break; | |
1616 | ||
1617 | case SCTP_CMD_HB_TIMER_UPDATE: | |
1618 | t = cmd->obj.transport; | |
765ff02e | 1619 | sctp_cmd_hb_timer_update(commands, t); |
1da177e4 LT |
1620 | break; |
1621 | ||
1622 | case SCTP_CMD_HB_TIMERS_STOP: | |
1623 | sctp_cmd_hb_timers_stop(commands, asoc); | |
1624 | break; | |
1625 | ||
1626 | case SCTP_CMD_REPORT_ERROR: | |
1627 | error = cmd->obj.error; | |
1628 | break; | |
1629 | ||
1630 | case SCTP_CMD_PROCESS_CTSN: | |
1631 | /* Dummy up a SACK for processing. */ | |
2178eda8 | 1632 | sackh.cum_tsn_ack = cmd->obj.be32; |
d4d6fb57 VY |
1633 | sackh.a_rwnd = asoc->peer.rwnd + |
1634 | asoc->outqueue.outstanding_bytes; | |
1da177e4 LT |
1635 | sackh.num_gap_ack_blocks = 0; |
1636 | sackh.num_dup_tsns = 0; | |
f6e80abe | 1637 | chunk->subh.sack_hdr = &sackh; |
1da177e4 | 1638 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, |
f6e80abe | 1639 | SCTP_CHUNK(chunk)); |
1da177e4 LT |
1640 | break; |
1641 | ||
1642 | case SCTP_CMD_DISCARD_PACKET: | |
2e3216cd VY |
1643 | /* We need to discard the whole packet. |
1644 | * Uncork the queue since there might be | |
1645 | * responses pending | |
1646 | */ | |
1da177e4 | 1647 | chunk->pdiscard = 1; |
2e3216cd | 1648 | if (asoc) { |
cea8768f | 1649 | sctp_outq_uncork(&asoc->outqueue, gfp); |
2e3216cd VY |
1650 | local_cork = 0; |
1651 | } | |
1da177e4 LT |
1652 | break; |
1653 | ||
1654 | case SCTP_CMD_RTO_PENDING: | |
1655 | t = cmd->obj.transport; | |
1656 | t->rto_pending = 1; | |
1657 | break; | |
1658 | ||
1659 | case SCTP_CMD_PART_DELIVER: | |
b26ddd81 | 1660 | sctp_ulpq_partial_delivery(&asoc->ulpq, GFP_ATOMIC); |
1da177e4 LT |
1661 | break; |
1662 | ||
1663 | case SCTP_CMD_RENEGE: | |
b26ddd81 | 1664 | sctp_ulpq_renege(&asoc->ulpq, cmd->obj.chunk, |
1da177e4 LT |
1665 | GFP_ATOMIC); |
1666 | break; | |
1667 | ||
1668 | case SCTP_CMD_SETUP_T4: | |
b26ddd81 | 1669 | sctp_cmd_setup_t4(commands, asoc, cmd->obj.chunk); |
1da177e4 LT |
1670 | break; |
1671 | ||
1672 | case SCTP_CMD_PROCESS_OPERR: | |
1673 | sctp_cmd_process_operr(commands, asoc, chunk); | |
1674 | break; | |
1675 | case SCTP_CMD_CLEAR_INIT_TAG: | |
1676 | asoc->peer.i.init_tag = 0; | |
1677 | break; | |
1678 | case SCTP_CMD_DEL_NON_PRIMARY: | |
1679 | sctp_cmd_del_non_primary(asoc); | |
1680 | break; | |
1681 | case SCTP_CMD_T3_RTX_TIMERS_STOP: | |
1682 | sctp_cmd_t3_rtx_timers_stop(commands, asoc); | |
1683 | break; | |
1684 | case SCTP_CMD_FORCE_PRIM_RETRAN: | |
1685 | t = asoc->peer.retran_path; | |
1686 | asoc->peer.retran_path = asoc->peer.primary_path; | |
cea8768f | 1687 | error = sctp_outq_uncork(&asoc->outqueue, gfp); |
1da177e4 LT |
1688 | local_cork = 0; |
1689 | asoc->peer.retran_path = t; | |
1690 | break; | |
8de8c873 SS |
1691 | case SCTP_CMD_SET_SK_ERR: |
1692 | sctp_cmd_set_sk_err(asoc, cmd->obj.error); | |
1693 | break; | |
07d93967 VY |
1694 | case SCTP_CMD_ASSOC_CHANGE: |
1695 | sctp_cmd_assoc_change(commands, asoc, | |
1696 | cmd->obj.u8); | |
1697 | break; | |
1698 | case SCTP_CMD_ADAPTATION_IND: | |
1699 | sctp_cmd_adaptation_ind(commands, asoc); | |
1700 | break; | |
1701 | ||
730fc3d0 VY |
1702 | case SCTP_CMD_ASSOC_SHKEY: |
1703 | error = sctp_auth_asoc_init_active_key(asoc, | |
1704 | GFP_ATOMIC); | |
1705 | break; | |
f4ad85ca GJ |
1706 | case SCTP_CMD_UPDATE_INITTAG: |
1707 | asoc->peer.i.init_tag = cmd->obj.u32; | |
1708 | break; | |
9c5c62be VY |
1709 | case SCTP_CMD_SEND_MSG: |
1710 | if (!asoc->outqueue.cork) { | |
1711 | sctp_outq_cork(&asoc->outqueue); | |
1712 | local_cork = 1; | |
1713 | } | |
cea8768f | 1714 | error = sctp_cmd_send_msg(asoc, cmd->obj.msg, gfp); |
9c5c62be | 1715 | break; |
c0786693 VY |
1716 | case SCTP_CMD_SEND_NEXT_ASCONF: |
1717 | sctp_cmd_send_asconf(asoc); | |
1718 | break; | |
a000c01e WY |
1719 | case SCTP_CMD_PURGE_ASCONF_QUEUE: |
1720 | sctp_asconf_queue_teardown(asoc); | |
1721 | break; | |
d5ccd496 MM |
1722 | |
1723 | case SCTP_CMD_SET_ASOC: | |
1724 | asoc = cmd->obj.asoc; | |
1725 | break; | |
1726 | ||
1da177e4 | 1727 | default: |
b26ddd81 NH |
1728 | pr_warn("Impossible command: %u\n", |
1729 | cmd->verb); | |
1da177e4 | 1730 | break; |
3ff50b79 SH |
1731 | } |
1732 | ||
1da177e4 LT |
1733 | if (error) |
1734 | break; | |
1735 | } | |
1736 | ||
1737 | out: | |
2e3216cd VY |
1738 | /* If this is in response to a received chunk, wait until |
1739 | * we are done with the packet to open the queue so that we don't | |
1740 | * send multiple packets in response to a single request. | |
1741 | */ | |
1742 | if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) { | |
1743 | if (chunk->end_of_packet || chunk->singleton) | |
cea8768f | 1744 | error = sctp_outq_uncork(&asoc->outqueue, gfp); |
2e3216cd | 1745 | } else if (local_cork) |
cea8768f | 1746 | error = sctp_outq_uncork(&asoc->outqueue, gfp); |
fb586f25 MRL |
1747 | |
1748 | if (sp->pending_data_ready) { | |
1749 | sk->sk_data_ready(sk); | |
1750 | sp->pending_data_ready = 0; | |
1751 | } | |
1da177e4 LT |
1752 | return error; |
1753 | nomem: | |
1754 | error = -ENOMEM; | |
1755 | goto out; | |
1756 | } | |
1757 |