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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 | |
25 | * along with GNU CC; see the file COPYING. If not, write to | |
26 | * the Free Software Foundation, 59 Temple Place - Suite 330, | |
27 | * Boston, MA 02111-1307, USA. | |
28 | * | |
29 | * Please send any bug reports or fixes you make to the | |
30 | * email address(es): | |
31 | * lksctp developers <lksctp-developers@lists.sourceforge.net> | |
32 | * | |
33 | * Or submit a bug report through the following website: | |
34 | * http://www.sf.net/projects/lksctp | |
35 | * | |
36 | * Written or modified by: | |
37 | * La Monte H.P. Yarroll <piggy@acm.org> | |
38 | * Karl Knutson <karl@athena.chicago.il.us> | |
39 | * Jon Grimm <jgrimm@austin.ibm.com> | |
40 | * Hui Huang <hui.huang@nokia.com> | |
41 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
42 | * Daisy Chang <daisyc@us.ibm.com> | |
43 | * Sridhar Samudrala <sri@us.ibm.com> | |
44 | * Ardelle Fan <ardelle.fan@intel.com> | |
45 | * | |
46 | * Any bugs reported given to us we will try to fix... any fixes shared will | |
47 | * be incorporated into the next SCTP release. | |
48 | */ | |
49 | ||
50 | #include <linux/skbuff.h> | |
51 | #include <linux/types.h> | |
52 | #include <linux/socket.h> | |
53 | #include <linux/ip.h> | |
5a0e3ad6 | 54 | #include <linux/gfp.h> |
1da177e4 LT |
55 | #include <net/sock.h> |
56 | #include <net/sctp/sctp.h> | |
57 | #include <net/sctp/sm.h> | |
58 | ||
59 | static int sctp_cmd_interpreter(sctp_event_t event_type, | |
60 | sctp_subtype_t subtype, | |
61 | sctp_state_t state, | |
62 | struct sctp_endpoint *ep, | |
63 | struct sctp_association *asoc, | |
64 | void *event_arg, | |
d808ad9a | 65 | sctp_disposition_t status, |
1da177e4 | 66 | sctp_cmd_seq_t *commands, |
dd0fc66f | 67 | gfp_t gfp); |
1da177e4 LT |
68 | static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, |
69 | sctp_state_t state, | |
70 | struct sctp_endpoint *ep, | |
71 | struct sctp_association *asoc, | |
72 | void *event_arg, | |
73 | sctp_disposition_t status, | |
74 | sctp_cmd_seq_t *commands, | |
dd0fc66f | 75 | gfp_t gfp); |
1da177e4 LT |
76 | |
77 | /******************************************************************** | |
78 | * Helper functions | |
79 | ********************************************************************/ | |
80 | ||
81 | /* A helper function for delayed processing of INET ECN CE bit. */ | |
d808ad9a | 82 | static void sctp_do_ecn_ce_work(struct sctp_association *asoc, |
1da177e4 LT |
83 | __u32 lowest_tsn) |
84 | { | |
85 | /* Save the TSN away for comparison when we receive CWR */ | |
86 | ||
87 | asoc->last_ecne_tsn = lowest_tsn; | |
88 | asoc->need_ecne = 1; | |
89 | } | |
90 | ||
91 | /* Helper function for delayed processing of SCTP ECNE chunk. */ | |
92 | /* RFC 2960 Appendix A | |
93 | * | |
94 | * RFC 2481 details a specific bit for a sender to send in | |
95 | * the header of its next outbound TCP segment to indicate to | |
96 | * its peer that it has reduced its congestion window. This | |
97 | * is termed the CWR bit. For SCTP the same indication is made | |
98 | * by including the CWR chunk. This chunk contains one data | |
99 | * element, i.e. the TSN number that was sent in the ECNE chunk. | |
100 | * This element represents the lowest TSN number in the datagram | |
101 | * that was originally marked with the CE bit. | |
102 | */ | |
103 | static struct sctp_chunk *sctp_do_ecn_ecne_work(struct sctp_association *asoc, | |
104 | __u32 lowest_tsn, | |
105 | struct sctp_chunk *chunk) | |
106 | { | |
107 | struct sctp_chunk *repl; | |
108 | ||
109 | /* Our previously transmitted packet ran into some congestion | |
110 | * so we should take action by reducing cwnd and ssthresh | |
111 | * and then ACK our peer that we we've done so by | |
112 | * sending a CWR. | |
113 | */ | |
114 | ||
115 | /* First, try to determine if we want to actually lower | |
116 | * our cwnd variables. Only lower them if the ECNE looks more | |
117 | * recent than the last response. | |
118 | */ | |
119 | if (TSN_lt(asoc->last_cwr_tsn, lowest_tsn)) { | |
120 | struct sctp_transport *transport; | |
121 | ||
122 | /* Find which transport's congestion variables | |
123 | * need to be adjusted. | |
124 | */ | |
125 | transport = sctp_assoc_lookup_tsn(asoc, lowest_tsn); | |
126 | ||
127 | /* Update the congestion variables. */ | |
128 | if (transport) | |
129 | sctp_transport_lower_cwnd(transport, | |
130 | SCTP_LOWER_CWND_ECNE); | |
131 | asoc->last_cwr_tsn = lowest_tsn; | |
132 | } | |
133 | ||
134 | /* Always try to quiet the other end. In case of lost CWR, | |
135 | * resend last_cwr_tsn. | |
136 | */ | |
137 | repl = sctp_make_cwr(asoc, asoc->last_cwr_tsn, chunk); | |
138 | ||
139 | /* If we run out of memory, it will look like a lost CWR. We'll | |
140 | * get back in sync eventually. | |
141 | */ | |
142 | return repl; | |
143 | } | |
144 | ||
145 | /* Helper function to do delayed processing of ECN CWR chunk. */ | |
146 | static void sctp_do_ecn_cwr_work(struct sctp_association *asoc, | |
147 | __u32 lowest_tsn) | |
148 | { | |
149 | /* Turn off ECNE getting auto-prepended to every outgoing | |
150 | * packet | |
151 | */ | |
152 | asoc->need_ecne = 0; | |
153 | } | |
154 | ||
155 | /* Generate SACK if necessary. We call this at the end of a packet. */ | |
156 | static int sctp_gen_sack(struct sctp_association *asoc, int force, | |
157 | sctp_cmd_seq_t *commands) | |
158 | { | |
159 | __u32 ctsn, max_tsn_seen; | |
160 | struct sctp_chunk *sack; | |
52ccb8e9 | 161 | struct sctp_transport *trans = asoc->peer.last_data_from; |
1da177e4 LT |
162 | int error = 0; |
163 | ||
d808ad9a | 164 | if (force || |
52ccb8e9 FF |
165 | (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) || |
166 | (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE))) | |
1da177e4 LT |
167 | asoc->peer.sack_needed = 1; |
168 | ||
169 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); | |
170 | max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map); | |
171 | ||
172 | /* From 12.2 Parameters necessary per association (i.e. the TCB): | |
173 | * | |
174 | * Ack State : This flag indicates if the next received packet | |
175 | * : is to be responded to with a SACK. ... | |
176 | * : When DATA chunks are out of order, SACK's | |
177 | * : are not delayed (see Section 6). | |
178 | * | |
179 | * [This is actually not mentioned in Section 6, but we | |
180 | * implement it here anyway. --piggy] | |
181 | */ | |
d808ad9a | 182 | if (max_tsn_seen != ctsn) |
1da177e4 LT |
183 | asoc->peer.sack_needed = 1; |
184 | ||
185 | /* From 6.2 Acknowledgement on Reception of DATA Chunks: | |
186 | * | |
187 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, | |
188 | * an acknowledgement SHOULD be generated for at least every | |
189 | * second packet (not every second DATA chunk) received, and | |
190 | * SHOULD be generated within 200 ms of the arrival of any | |
191 | * unacknowledged DATA chunk. ... | |
192 | */ | |
193 | if (!asoc->peer.sack_needed) { | |
d364d927 | 194 | asoc->peer.sack_cnt++; |
52ccb8e9 FF |
195 | |
196 | /* Set the SACK delay timeout based on the | |
197 | * SACK delay for the last transport | |
198 | * data was received from, or the default | |
199 | * for the association. | |
200 | */ | |
d364d927 WY |
201 | if (trans) { |
202 | /* We will need a SACK for the next packet. */ | |
203 | if (asoc->peer.sack_cnt >= trans->sackfreq - 1) | |
204 | asoc->peer.sack_needed = 1; | |
205 | ||
d808ad9a | 206 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
52ccb8e9 | 207 | trans->sackdelay; |
d364d927 WY |
208 | } else { |
209 | /* We will need a SACK for the next packet. */ | |
210 | if (asoc->peer.sack_cnt >= asoc->sackfreq - 1) | |
211 | asoc->peer.sack_needed = 1; | |
212 | ||
d808ad9a | 213 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
52ccb8e9 | 214 | asoc->sackdelay; |
d364d927 | 215 | } |
52ccb8e9 FF |
216 | |
217 | /* Restart the SACK timer. */ | |
218 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
219 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
1da177e4 | 220 | } else { |
90f2f531 | 221 | asoc->a_rwnd = asoc->rwnd; |
1da177e4 LT |
222 | sack = sctp_make_sack(asoc); |
223 | if (!sack) | |
224 | goto nomem; | |
225 | ||
226 | asoc->peer.sack_needed = 0; | |
d364d927 | 227 | asoc->peer.sack_cnt = 0; |
1da177e4 | 228 | |
732ba35e | 229 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack)); |
1da177e4 LT |
230 | |
231 | /* Stop the SACK timer. */ | |
232 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
233 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
234 | } | |
52ccb8e9 | 235 | |
1da177e4 LT |
236 | return error; |
237 | nomem: | |
238 | error = -ENOMEM; | |
239 | return error; | |
240 | } | |
241 | ||
242 | /* When the T3-RTX timer expires, it calls this function to create the | |
243 | * relevant state machine event. | |
244 | */ | |
245 | void sctp_generate_t3_rtx_event(unsigned long peer) | |
246 | { | |
247 | int error; | |
248 | struct sctp_transport *transport = (struct sctp_transport *) peer; | |
249 | struct sctp_association *asoc = transport->asoc; | |
250 | ||
251 | /* Check whether a task is in the sock. */ | |
252 | ||
253 | sctp_bh_lock_sock(asoc->base.sk); | |
254 | if (sock_owned_by_user(asoc->base.sk)) { | |
0dc47877 | 255 | SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__); |
1da177e4 LT |
256 | |
257 | /* Try again later. */ | |
258 | if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20))) | |
259 | sctp_transport_hold(transport); | |
260 | goto out_unlock; | |
261 | } | |
262 | ||
263 | /* Is this transport really dead and just waiting around for | |
264 | * the timer to let go of the reference? | |
265 | */ | |
266 | if (transport->dead) | |
267 | goto out_unlock; | |
268 | ||
269 | /* Run through the state machine. */ | |
270 | error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT, | |
271 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX), | |
272 | asoc->state, | |
273 | asoc->ep, asoc, | |
274 | transport, GFP_ATOMIC); | |
275 | ||
276 | if (error) | |
277 | asoc->base.sk->sk_err = -error; | |
278 | ||
279 | out_unlock: | |
280 | sctp_bh_unlock_sock(asoc->base.sk); | |
281 | sctp_transport_put(transport); | |
282 | } | |
283 | ||
284 | /* This is a sa interface for producing timeout events. It works | |
285 | * for timeouts which use the association as their parameter. | |
286 | */ | |
287 | static void sctp_generate_timeout_event(struct sctp_association *asoc, | |
288 | sctp_event_timeout_t timeout_type) | |
289 | { | |
290 | int error = 0; | |
291 | ||
292 | sctp_bh_lock_sock(asoc->base.sk); | |
293 | if (sock_owned_by_user(asoc->base.sk)) { | |
294 | SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n", | |
0dc47877 | 295 | __func__, |
1da177e4 LT |
296 | timeout_type); |
297 | ||
298 | /* Try again later. */ | |
299 | if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20))) | |
300 | sctp_association_hold(asoc); | |
301 | goto out_unlock; | |
302 | } | |
303 | ||
304 | /* Is this association really dead and just waiting around for | |
305 | * the timer to let go of the reference? | |
306 | */ | |
307 | if (asoc->base.dead) | |
308 | goto out_unlock; | |
309 | ||
310 | /* Run through the state machine. */ | |
311 | error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT, | |
312 | SCTP_ST_TIMEOUT(timeout_type), | |
313 | asoc->state, asoc->ep, asoc, | |
314 | (void *)timeout_type, GFP_ATOMIC); | |
315 | ||
316 | if (error) | |
317 | asoc->base.sk->sk_err = -error; | |
318 | ||
319 | out_unlock: | |
320 | sctp_bh_unlock_sock(asoc->base.sk); | |
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; | |
370 | ||
371 | sctp_bh_lock_sock(asoc->base.sk); | |
372 | if (sock_owned_by_user(asoc->base.sk)) { | |
0dc47877 | 373 | SCTP_DEBUG_PRINTK("%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 | ||
381 | /* Is this structure just waiting around for us to actually | |
382 | * get destroyed? | |
383 | */ | |
384 | if (transport->dead) | |
385 | goto out_unlock; | |
386 | ||
387 | error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT, | |
388 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT), | |
389 | asoc->state, asoc->ep, asoc, | |
390 | transport, GFP_ATOMIC); | |
391 | ||
d808ad9a | 392 | if (error) |
1da177e4 LT |
393 | asoc->base.sk->sk_err = -error; |
394 | ||
395 | out_unlock: | |
396 | sctp_bh_unlock_sock(asoc->base.sk); | |
397 | sctp_transport_put(transport); | |
398 | } | |
399 | ||
50b5d6ad VY |
400 | /* Handle the timeout of the ICMP protocol unreachable timer. Trigger |
401 | * the correct state machine transition that will close the association. | |
402 | */ | |
403 | void sctp_generate_proto_unreach_event(unsigned long data) | |
404 | { | |
405 | struct sctp_transport *transport = (struct sctp_transport *) data; | |
406 | struct sctp_association *asoc = transport->asoc; | |
407 | ||
408 | sctp_bh_lock_sock(asoc->base.sk); | |
409 | if (sock_owned_by_user(asoc->base.sk)) { | |
410 | SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__); | |
411 | ||
412 | /* Try again later. */ | |
413 | if (!mod_timer(&transport->proto_unreach_timer, | |
414 | jiffies + (HZ/20))) | |
415 | sctp_association_hold(asoc); | |
416 | goto out_unlock; | |
417 | } | |
418 | ||
419 | /* Is this structure just waiting around for us to actually | |
420 | * get destroyed? | |
421 | */ | |
422 | if (asoc->base.dead) | |
423 | goto out_unlock; | |
424 | ||
425 | sctp_do_sm(SCTP_EVENT_T_OTHER, | |
426 | SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH), | |
427 | asoc->state, asoc->ep, asoc, transport, GFP_ATOMIC); | |
428 | ||
429 | out_unlock: | |
430 | sctp_bh_unlock_sock(asoc->base.sk); | |
431 | sctp_association_put(asoc); | |
432 | } | |
433 | ||
434 | ||
1da177e4 LT |
435 | /* Inject a SACK Timeout event into the state machine. */ |
436 | static void sctp_generate_sack_event(unsigned long data) | |
437 | { | |
438 | struct sctp_association *asoc = (struct sctp_association *) data; | |
439 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK); | |
440 | } | |
441 | ||
442 | sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = { | |
443 | NULL, | |
444 | sctp_generate_t1_cookie_event, | |
445 | sctp_generate_t1_init_event, | |
446 | sctp_generate_t2_shutdown_event, | |
447 | NULL, | |
448 | sctp_generate_t4_rto_event, | |
449 | sctp_generate_t5_shutdown_guard_event, | |
1e7d3d90 | 450 | NULL, |
1da177e4 LT |
451 | sctp_generate_sack_event, |
452 | sctp_generate_autoclose_event, | |
453 | }; | |
454 | ||
455 | ||
456 | /* RFC 2960 8.2 Path Failure Detection | |
457 | * | |
458 | * When its peer endpoint is multi-homed, an endpoint should keep a | |
459 | * error counter for each of the destination transport addresses of the | |
460 | * peer endpoint. | |
461 | * | |
462 | * Each time the T3-rtx timer expires on any address, or when a | |
463 | * HEARTBEAT sent to an idle address is not acknowledged within a RTO, | |
464 | * the error counter of that destination address will be incremented. | |
465 | * When the value in the error counter exceeds the protocol parameter | |
466 | * 'Path.Max.Retrans' of that destination address, the endpoint should | |
467 | * mark the destination transport address as inactive, and a | |
468 | * notification SHOULD be sent to the upper layer. | |
469 | * | |
470 | */ | |
471 | static void sctp_do_8_2_transport_strike(struct sctp_association *asoc, | |
7e99013a VY |
472 | struct sctp_transport *transport, |
473 | int is_hb) | |
1da177e4 LT |
474 | { |
475 | /* The check for association's overall error counter exceeding the | |
476 | * threshold is done in the state function. | |
477 | */ | |
b9f84786 VY |
478 | /* We are here due to a timer expiration. If the timer was |
479 | * not a HEARTBEAT, then normal error tracking is done. | |
480 | * If the timer was a heartbeat, we only increment error counts | |
481 | * when we already have an outstanding HEARTBEAT that has not | |
482 | * been acknowledged. | |
483 | * Additionaly, some tranport states inhibit error increments. | |
ad8fec17 | 484 | */ |
b9f84786 | 485 | if (!is_hb) { |
ad8fec17 | 486 | asoc->overall_error_count++; |
b9f84786 VY |
487 | if (transport->state != SCTP_INACTIVE) |
488 | transport->error_count++; | |
489 | } else if (transport->hb_sent) { | |
490 | if (transport->state != SCTP_UNCONFIRMED) | |
491 | asoc->overall_error_count++; | |
492 | if (transport->state != SCTP_INACTIVE) | |
493 | transport->error_count++; | |
494 | } | |
1da177e4 | 495 | |
3f7a87d2 | 496 | if (transport->state != SCTP_INACTIVE && |
b9f84786 | 497 | (transport->error_count > transport->pathmaxrxt)) { |
3f7a87d2 FF |
498 | SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p", |
499 | " transport IP: port:%d failed.\n", | |
500 | asoc, | |
b3f5b3b6 AV |
501 | (&transport->ipaddr), |
502 | ntohs(transport->ipaddr.v4.sin_port)); | |
1da177e4 LT |
503 | sctp_assoc_control_transport(asoc, transport, |
504 | SCTP_TRANSPORT_DOWN, | |
505 | SCTP_FAILED_THRESHOLD); | |
506 | } | |
507 | ||
508 | /* E2) For the destination address for which the timer | |
509 | * expires, set RTO <- RTO * 2 ("back off the timer"). The | |
510 | * maximum value discussed in rule C7 above (RTO.max) may be | |
511 | * used to provide an upper bound to this doubling operation. | |
faee47cd VY |
512 | * |
513 | * Special Case: the first HB doesn't trigger exponential backoff. | |
3ad2f3fb | 514 | * The first unacknowledged HB triggers it. We do this with a flag |
faee47cd | 515 | * that indicates that we have an outstanding HB. |
1da177e4 | 516 | */ |
7e99013a | 517 | if (!is_hb || transport->hb_sent) { |
faee47cd VY |
518 | transport->rto = min((transport->rto * 2), transport->asoc->rto_max); |
519 | } | |
1da177e4 LT |
520 | } |
521 | ||
522 | /* Worker routine to handle INIT command failure. */ | |
523 | static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands, | |
524 | struct sctp_association *asoc, | |
525 | unsigned error) | |
526 | { | |
527 | struct sctp_ulpevent *event; | |
528 | ||
529 | event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC, | |
a5a35e76 | 530 | (__u16)error, 0, 0, NULL, |
1da177e4 LT |
531 | GFP_ATOMIC); |
532 | ||
533 | if (event) | |
534 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
535 | SCTP_ULPEVENT(event)); | |
536 | ||
537 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
538 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
539 | ||
540 | /* SEND_FAILED sent later when cleaning up the association. */ | |
541 | asoc->outqueue.error = error; | |
542 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
543 | } | |
544 | ||
545 | /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */ | |
546 | static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands, | |
547 | struct sctp_association *asoc, | |
548 | sctp_event_t event_type, | |
549 | sctp_subtype_t subtype, | |
550 | struct sctp_chunk *chunk, | |
551 | unsigned error) | |
552 | { | |
553 | struct sctp_ulpevent *event; | |
554 | ||
555 | /* Cancel any partial delivery in progress. */ | |
556 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); | |
557 | ||
a5a35e76 VY |
558 | if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT) |
559 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
560 | (__u16)error, 0, 0, chunk, | |
561 | GFP_ATOMIC); | |
562 | else | |
563 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
564 | (__u16)error, 0, 0, NULL, | |
1da177e4 LT |
565 | GFP_ATOMIC); |
566 | if (event) | |
567 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
568 | SCTP_ULPEVENT(event)); | |
569 | ||
570 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
571 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
572 | ||
1da177e4 LT |
573 | /* SEND_FAILED sent later when cleaning up the association. */ |
574 | asoc->outqueue.error = error; | |
575 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
576 | } | |
577 | ||
578 | /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT | |
579 | * inside the cookie. In reality, this is only used for INIT-ACK processing | |
580 | * since all other cases use "temporary" associations and can do all | |
581 | * their work in statefuns directly. | |
582 | */ | |
583 | static int sctp_cmd_process_init(sctp_cmd_seq_t *commands, | |
584 | struct sctp_association *asoc, | |
585 | struct sctp_chunk *chunk, | |
3182cd84 | 586 | sctp_init_chunk_t *peer_init, |
dd0fc66f | 587 | gfp_t gfp) |
1da177e4 LT |
588 | { |
589 | int error; | |
590 | ||
591 | /* We only process the init as a sideeffect in a single | |
592 | * case. This is when we process the INIT-ACK. If we | |
593 | * fail during INIT processing (due to malloc problems), | |
594 | * just return the error and stop processing the stack. | |
595 | */ | |
596 | if (!sctp_process_init(asoc, chunk->chunk_hdr->type, | |
597 | sctp_source(chunk), peer_init, gfp)) | |
598 | error = -ENOMEM; | |
599 | else | |
600 | error = 0; | |
601 | ||
602 | return error; | |
603 | } | |
604 | ||
605 | /* Helper function to break out starting up of heartbeat timers. */ | |
606 | static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds, | |
607 | struct sctp_association *asoc) | |
608 | { | |
609 | struct sctp_transport *t; | |
1da177e4 LT |
610 | |
611 | /* Start a heartbeat timer for each transport on the association. | |
612 | * hold a reference on the transport to make sure none of | |
613 | * the needed data structures go away. | |
614 | */ | |
9dbc15f0 | 615 | list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) { |
1da177e4 LT |
616 | |
617 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) | |
618 | sctp_transport_hold(t); | |
619 | } | |
620 | } | |
621 | ||
622 | static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds, | |
623 | struct sctp_association *asoc) | |
624 | { | |
625 | struct sctp_transport *t; | |
1da177e4 LT |
626 | |
627 | /* Stop all heartbeat timers. */ | |
628 | ||
9dbc15f0 RD |
629 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
630 | transports) { | |
1da177e4 LT |
631 | if (del_timer(&t->hb_timer)) |
632 | sctp_transport_put(t); | |
633 | } | |
634 | } | |
635 | ||
636 | /* Helper function to stop any pending T3-RTX timers */ | |
637 | static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds, | |
d808ad9a | 638 | struct sctp_association *asoc) |
1da177e4 LT |
639 | { |
640 | struct sctp_transport *t; | |
1da177e4 | 641 | |
9dbc15f0 RD |
642 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
643 | transports) { | |
1da177e4 LT |
644 | if (timer_pending(&t->T3_rtx_timer) && |
645 | del_timer(&t->T3_rtx_timer)) { | |
646 | sctp_transport_put(t); | |
647 | } | |
648 | } | |
649 | } | |
650 | ||
651 | ||
652 | /* Helper function to update the heartbeat timer. */ | |
653 | static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds, | |
1da177e4 LT |
654 | struct sctp_transport *t) |
655 | { | |
656 | /* Update the heartbeat timer. */ | |
657 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) | |
658 | sctp_transport_hold(t); | |
659 | } | |
660 | ||
661 | /* Helper function to handle the reception of an HEARTBEAT ACK. */ | |
662 | static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds, | |
663 | struct sctp_association *asoc, | |
664 | struct sctp_transport *t, | |
665 | struct sctp_chunk *chunk) | |
666 | { | |
667 | sctp_sender_hb_info_t *hbinfo; | |
668 | ||
669 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the | |
670 | * HEARTBEAT should clear the error counter of the destination | |
671 | * transport address to which the HEARTBEAT was sent. | |
672 | * The association's overall error count is also cleared. | |
673 | */ | |
674 | t->error_count = 0; | |
675 | t->asoc->overall_error_count = 0; | |
676 | ||
faee47cd VY |
677 | /* Clear the hb_sent flag to signal that we had a good |
678 | * acknowledgement. | |
679 | */ | |
680 | t->hb_sent = 0; | |
681 | ||
1da177e4 LT |
682 | /* Mark the destination transport address as active if it is not so |
683 | * marked. | |
684 | */ | |
ad8fec17 | 685 | if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) |
1da177e4 LT |
686 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, |
687 | SCTP_HEARTBEAT_SUCCESS); | |
688 | ||
689 | /* The receiver of the HEARTBEAT ACK should also perform an | |
690 | * RTT measurement for that destination transport address | |
691 | * using the time value carried in the HEARTBEAT ACK chunk. | |
e533ca16 VY |
692 | * If the transport's rto_pending variable has been cleared, |
693 | * it was most likely due to a retransmit. However, we want | |
694 | * to re-enable it to properly update the rto. | |
1da177e4 | 695 | */ |
e533ca16 VY |
696 | if (t->rto_pending == 0) |
697 | t->rto_pending = 1; | |
698 | ||
1da177e4 LT |
699 | hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data; |
700 | sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at)); | |
ad8fec17 SS |
701 | |
702 | /* Update the heartbeat timer. */ | |
703 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) | |
704 | sctp_transport_hold(t); | |
1da177e4 LT |
705 | } |
706 | ||
1da177e4 LT |
707 | |
708 | /* Helper function to process the process SACK command. */ | |
709 | static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds, | |
710 | struct sctp_association *asoc, | |
711 | struct sctp_sackhdr *sackh) | |
712 | { | |
2e3216cd | 713 | int err = 0; |
1da177e4 LT |
714 | |
715 | if (sctp_outq_sack(&asoc->outqueue, sackh)) { | |
716 | /* There are no more TSNs awaiting SACK. */ | |
717 | err = sctp_do_sm(SCTP_EVENT_T_OTHER, | |
718 | SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN), | |
719 | asoc->state, asoc->ep, asoc, NULL, | |
720 | GFP_ATOMIC); | |
1da177e4 LT |
721 | } |
722 | ||
723 | return err; | |
724 | } | |
725 | ||
726 | /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set | |
727 | * the transport for a shutdown chunk. | |
728 | */ | |
d808ad9a | 729 | static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds, |
1da177e4 LT |
730 | struct sctp_association *asoc, |
731 | struct sctp_chunk *chunk) | |
732 | { | |
733 | struct sctp_transport *t; | |
734 | ||
c17b02b3 VY |
735 | if (chunk->transport) |
736 | t = chunk->transport; | |
737 | else { | |
738 | t = sctp_assoc_choose_alter_transport(asoc, | |
9919b455 | 739 | asoc->shutdown_last_sent_to); |
c17b02b3 VY |
740 | chunk->transport = t; |
741 | } | |
1da177e4 LT |
742 | asoc->shutdown_last_sent_to = t; |
743 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto; | |
1da177e4 LT |
744 | } |
745 | ||
746 | /* Helper function to change the state of an association. */ | |
d808ad9a | 747 | static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds, |
1da177e4 LT |
748 | struct sctp_association *asoc, |
749 | sctp_state_t state) | |
750 | { | |
751 | struct sock *sk = asoc->base.sk; | |
752 | ||
753 | asoc->state = state; | |
754 | ||
3f7a87d2 FF |
755 | SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n", |
756 | asoc, sctp_state_tbl[state]); | |
757 | ||
1da177e4 | 758 | if (sctp_style(sk, TCP)) { |
3f7a87d2 | 759 | /* Change the sk->sk_state of a TCP-style socket that has |
af901ca1 | 760 | * successfully completed a connect() call. |
1da177e4 LT |
761 | */ |
762 | if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED)) | |
763 | sk->sk_state = SCTP_SS_ESTABLISHED; | |
764 | ||
765 | /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */ | |
766 | if (sctp_state(asoc, SHUTDOWN_RECEIVED) && | |
767 | sctp_sstate(sk, ESTABLISHED)) | |
768 | sk->sk_shutdown |= RCV_SHUTDOWN; | |
769 | } | |
770 | ||
3f7a87d2 FF |
771 | if (sctp_state(asoc, COOKIE_WAIT)) { |
772 | /* Reset init timeouts since they may have been | |
773 | * increased due to timer expirations. | |
774 | */ | |
775 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = | |
1e7d3d90 | 776 | asoc->rto_initial; |
3f7a87d2 | 777 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = |
1e7d3d90 | 778 | asoc->rto_initial; |
3f7a87d2 FF |
779 | } |
780 | ||
1da177e4 LT |
781 | if (sctp_state(asoc, ESTABLISHED) || |
782 | sctp_state(asoc, CLOSED) || | |
783 | sctp_state(asoc, SHUTDOWN_RECEIVED)) { | |
784 | /* Wake up any processes waiting in the asoc's wait queue in | |
785 | * sctp_wait_for_connect() or sctp_wait_for_sndbuf(). | |
d808ad9a | 786 | */ |
1da177e4 LT |
787 | if (waitqueue_active(&asoc->wait)) |
788 | wake_up_interruptible(&asoc->wait); | |
789 | ||
790 | /* Wake up any processes waiting in the sk's sleep queue of | |
791 | * a TCP-style or UDP-style peeled-off socket in | |
792 | * sctp_wait_for_accept() or sctp_wait_for_packet(). | |
793 | * For a UDP-style socket, the waiters are woken up by the | |
794 | * notifications. | |
795 | */ | |
796 | if (!sctp_style(sk, UDP)) | |
797 | sk->sk_state_change(sk); | |
798 | } | |
799 | } | |
800 | ||
801 | /* Helper function to delete an association. */ | |
802 | static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds, | |
803 | struct sctp_association *asoc) | |
804 | { | |
805 | struct sock *sk = asoc->base.sk; | |
806 | ||
807 | /* If it is a non-temporary association belonging to a TCP-style | |
d808ad9a | 808 | * listening socket that is not closed, do not free it so that accept() |
1da177e4 | 809 | * can pick it up later. |
d808ad9a | 810 | */ |
1da177e4 LT |
811 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) && |
812 | (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK)) | |
813 | return; | |
814 | ||
815 | sctp_unhash_established(asoc); | |
816 | sctp_association_free(asoc); | |
817 | } | |
818 | ||
819 | /* | |
820 | * ADDIP Section 4.1 ASCONF Chunk Procedures | |
821 | * A4) Start a T-4 RTO timer, using the RTO value of the selected | |
822 | * destination address (we use active path instead of primary path just | |
d808ad9a | 823 | * because primary path may be inactive. |
1da177e4 LT |
824 | */ |
825 | static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds, | |
826 | struct sctp_association *asoc, | |
827 | struct sctp_chunk *chunk) | |
828 | { | |
829 | struct sctp_transport *t; | |
830 | ||
9919b455 | 831 | t = sctp_assoc_choose_alter_transport(asoc, chunk->transport); |
1da177e4 LT |
832 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto; |
833 | chunk->transport = t; | |
834 | } | |
835 | ||
d808ad9a | 836 | /* Process an incoming Operation Error Chunk. */ |
1da177e4 LT |
837 | static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds, |
838 | struct sctp_association *asoc, | |
839 | struct sctp_chunk *chunk) | |
840 | { | |
1da177e4 | 841 | struct sctp_errhdr *err_hdr; |
3df26787 WY |
842 | struct sctp_ulpevent *ev; |
843 | ||
844 | while (chunk->chunk_end > chunk->skb->data) { | |
845 | err_hdr = (struct sctp_errhdr *)(chunk->skb->data); | |
846 | ||
847 | ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0, | |
848 | GFP_ATOMIC); | |
849 | if (!ev) | |
850 | return; | |
851 | ||
852 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
853 | ||
854 | switch (err_hdr->cause) { | |
855 | case SCTP_ERROR_UNKNOWN_CHUNK: | |
856 | { | |
857 | sctp_chunkhdr_t *unk_chunk_hdr; | |
858 | ||
859 | unk_chunk_hdr = (sctp_chunkhdr_t *)err_hdr->variable; | |
860 | switch (unk_chunk_hdr->type) { | |
861 | /* ADDIP 4.1 A9) If the peer responds to an ASCONF with | |
862 | * an ERROR chunk reporting that it did not recognized | |
863 | * the ASCONF chunk type, the sender of the ASCONF MUST | |
864 | * NOT send any further ASCONF chunks and MUST stop its | |
865 | * T-4 timer. | |
866 | */ | |
867 | case SCTP_CID_ASCONF: | |
868 | if (asoc->peer.asconf_capable == 0) | |
869 | break; | |
870 | ||
871 | asoc->peer.asconf_capable = 0; | |
872 | sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP, | |
1da177e4 | 873 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); |
3df26787 WY |
874 | break; |
875 | default: | |
876 | break; | |
877 | } | |
1da177e4 | 878 | break; |
3df26787 | 879 | } |
1da177e4 LT |
880 | default: |
881 | break; | |
882 | } | |
1da177e4 LT |
883 | } |
884 | } | |
885 | ||
886 | /* Process variable FWDTSN chunk information. */ | |
d808ad9a | 887 | static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq, |
1da177e4 LT |
888 | struct sctp_chunk *chunk) |
889 | { | |
890 | struct sctp_fwdtsn_skip *skip; | |
891 | /* Walk through all the skipped SSNs */ | |
892 | sctp_walk_fwdtsn(skip, chunk) { | |
893 | sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn)); | |
894 | } | |
1da177e4 LT |
895 | } |
896 | ||
d808ad9a | 897 | /* Helper function to remove the association non-primary peer |
1da177e4 | 898 | * transports. |
d808ad9a | 899 | */ |
1da177e4 LT |
900 | static void sctp_cmd_del_non_primary(struct sctp_association *asoc) |
901 | { | |
902 | struct sctp_transport *t; | |
903 | struct list_head *pos; | |
904 | struct list_head *temp; | |
905 | ||
906 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
907 | t = list_entry(pos, struct sctp_transport, transports); | |
5f242a13 | 908 | if (!sctp_cmp_addr_exact(&t->ipaddr, |
d808ad9a | 909 | &asoc->peer.primary_addr)) { |
38a03145 | 910 | sctp_assoc_del_peer(asoc, &t->ipaddr); |
1da177e4 LT |
911 | } |
912 | } | |
1da177e4 LT |
913 | } |
914 | ||
8de8c873 SS |
915 | /* Helper function to set sk_err on a 1-1 style socket. */ |
916 | static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error) | |
917 | { | |
918 | struct sock *sk = asoc->base.sk; | |
919 | ||
920 | if (!sctp_style(sk, UDP)) | |
921 | sk->sk_err = error; | |
922 | } | |
923 | ||
07d93967 VY |
924 | /* Helper function to generate an association change event */ |
925 | static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands, | |
926 | struct sctp_association *asoc, | |
927 | u8 state) | |
928 | { | |
929 | struct sctp_ulpevent *ev; | |
930 | ||
931 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0, | |
932 | asoc->c.sinit_num_ostreams, | |
933 | asoc->c.sinit_max_instreams, | |
934 | NULL, GFP_ATOMIC); | |
935 | if (ev) | |
936 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
937 | } | |
938 | ||
939 | /* Helper function to generate an adaptation indication event */ | |
940 | static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands, | |
941 | struct sctp_association *asoc) | |
942 | { | |
943 | struct sctp_ulpevent *ev; | |
944 | ||
945 | ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); | |
946 | ||
947 | if (ev) | |
948 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
949 | } | |
950 | ||
96cd0d3d VY |
951 | |
952 | static void sctp_cmd_t1_timer_update(struct sctp_association *asoc, | |
953 | sctp_event_timeout_t timer, | |
954 | char *name) | |
955 | { | |
956 | struct sctp_transport *t; | |
957 | ||
958 | t = asoc->init_last_sent_to; | |
959 | asoc->init_err_counter++; | |
960 | ||
961 | if (t->init_sent_count > (asoc->init_cycle + 1)) { | |
962 | asoc->timeouts[timer] *= 2; | |
963 | if (asoc->timeouts[timer] > asoc->max_init_timeo) { | |
964 | asoc->timeouts[timer] = asoc->max_init_timeo; | |
965 | } | |
966 | asoc->init_cycle++; | |
967 | SCTP_DEBUG_PRINTK( | |
968 | "T1 %s Timeout adjustment" | |
969 | " init_err_counter: %d" | |
970 | " cycle: %d" | |
971 | " timeout: %ld\n", | |
972 | name, | |
973 | asoc->init_err_counter, | |
974 | asoc->init_cycle, | |
975 | asoc->timeouts[timer]); | |
976 | } | |
977 | ||
978 | } | |
979 | ||
9c5c62be VY |
980 | /* Send the whole message, chunk by chunk, to the outqueue. |
981 | * This way the whole message is queued up and bundling if | |
982 | * encouraged for small fragments. | |
983 | */ | |
984 | static int sctp_cmd_send_msg(struct sctp_association *asoc, | |
985 | struct sctp_datamsg *msg) | |
986 | { | |
987 | struct sctp_chunk *chunk; | |
988 | int error = 0; | |
989 | ||
990 | list_for_each_entry(chunk, &msg->chunks, frag_list) { | |
991 | error = sctp_outq_tail(&asoc->outqueue, chunk); | |
992 | if (error) | |
993 | break; | |
994 | } | |
995 | ||
996 | return error; | |
997 | } | |
998 | ||
999 | ||
c0786693 VY |
1000 | /* Sent the next ASCONF packet currently stored in the association. |
1001 | * This happens after the ASCONF_ACK was succeffully processed. | |
1002 | */ | |
1003 | static void sctp_cmd_send_asconf(struct sctp_association *asoc) | |
1004 | { | |
1005 | /* Send the next asconf chunk from the addip chunk | |
1006 | * queue. | |
1007 | */ | |
1008 | if (!list_empty(&asoc->addip_chunk_list)) { | |
1009 | struct list_head *entry = asoc->addip_chunk_list.next; | |
1010 | struct sctp_chunk *asconf = list_entry(entry, | |
1011 | struct sctp_chunk, list); | |
1012 | list_del_init(entry); | |
1013 | ||
1014 | /* Hold the chunk until an ASCONF_ACK is received. */ | |
1015 | sctp_chunk_hold(asconf); | |
1016 | if (sctp_primitive_ASCONF(asoc, asconf)) | |
1017 | sctp_chunk_free(asconf); | |
1018 | else | |
1019 | asoc->addip_last_asconf = asconf; | |
1020 | } | |
1021 | } | |
1022 | ||
9c5c62be | 1023 | |
1da177e4 LT |
1024 | /* These three macros allow us to pull the debugging code out of the |
1025 | * main flow of sctp_do_sm() to keep attention focused on the real | |
1026 | * functionality there. | |
1027 | */ | |
1028 | #define DEBUG_PRE \ | |
1029 | SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \ | |
1030 | "ep %p, %s, %s, asoc %p[%s], %s\n", \ | |
1031 | ep, sctp_evttype_tbl[event_type], \ | |
1032 | (*debug_fn)(subtype), asoc, \ | |
1033 | sctp_state_tbl[state], state_fn->name) | |
1034 | ||
1035 | #define DEBUG_POST \ | |
1036 | SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \ | |
1037 | "asoc %p, status: %s\n", \ | |
1038 | asoc, sctp_status_tbl[status]) | |
1039 | ||
1040 | #define DEBUG_POST_SFX \ | |
1041 | SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \ | |
1042 | error, asoc, \ | |
1043 | sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \ | |
1044 | sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED]) | |
1045 | ||
1046 | /* | |
1047 | * This is the master state machine processing function. | |
1048 | * | |
1049 | * If you want to understand all of lksctp, this is a | |
1050 | * good place to start. | |
1051 | */ | |
1052 | int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype, | |
1053 | sctp_state_t state, | |
1054 | struct sctp_endpoint *ep, | |
1055 | struct sctp_association *asoc, | |
1056 | void *event_arg, | |
dd0fc66f | 1057 | gfp_t gfp) |
1da177e4 LT |
1058 | { |
1059 | sctp_cmd_seq_t commands; | |
1060 | const sctp_sm_table_entry_t *state_fn; | |
1061 | sctp_disposition_t status; | |
1062 | int error = 0; | |
1063 | typedef const char *(printfn_t)(sctp_subtype_t); | |
1064 | ||
1065 | static printfn_t *table[] = { | |
1066 | NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname, | |
1067 | }; | |
1068 | printfn_t *debug_fn __attribute__ ((unused)) = table[event_type]; | |
1069 | ||
1070 | /* Look up the state function, run it, and then process the | |
1071 | * side effects. These three steps are the heart of lksctp. | |
1072 | */ | |
1073 | state_fn = sctp_sm_lookup_event(event_type, state, subtype); | |
1074 | ||
1075 | sctp_init_cmd_seq(&commands); | |
1076 | ||
1077 | DEBUG_PRE; | |
1078 | status = (*state_fn->fn)(ep, asoc, subtype, event_arg, &commands); | |
1079 | DEBUG_POST; | |
1080 | ||
1081 | error = sctp_side_effects(event_type, subtype, state, | |
d808ad9a | 1082 | ep, asoc, event_arg, status, |
1da177e4 LT |
1083 | &commands, gfp); |
1084 | DEBUG_POST_SFX; | |
1085 | ||
1086 | return error; | |
1087 | } | |
1088 | ||
1089 | #undef DEBUG_PRE | |
1090 | #undef DEBUG_POST | |
1091 | ||
1092 | /***************************************************************** | |
1093 | * This the master state function side effect processing function. | |
1094 | *****************************************************************/ | |
1095 | static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, | |
1096 | sctp_state_t state, | |
1097 | struct sctp_endpoint *ep, | |
1098 | struct sctp_association *asoc, | |
1099 | void *event_arg, | |
1100 | sctp_disposition_t status, | |
1101 | sctp_cmd_seq_t *commands, | |
dd0fc66f | 1102 | gfp_t gfp) |
1da177e4 LT |
1103 | { |
1104 | int error; | |
1105 | ||
1106 | /* FIXME - Most of the dispositions left today would be categorized | |
1107 | * as "exceptional" dispositions. For those dispositions, it | |
1108 | * may not be proper to run through any of the commands at all. | |
1109 | * For example, the command interpreter might be run only with | |
1110 | * disposition SCTP_DISPOSITION_CONSUME. | |
1111 | */ | |
1112 | if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state, | |
1113 | ep, asoc, | |
1114 | event_arg, status, | |
1115 | commands, gfp))) | |
1116 | goto bail; | |
1117 | ||
1118 | switch (status) { | |
1119 | case SCTP_DISPOSITION_DISCARD: | |
1120 | SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, " | |
1121 | "event_type %d, event_id %d\n", | |
1122 | state, event_type, subtype.chunk); | |
1123 | break; | |
1124 | ||
1125 | case SCTP_DISPOSITION_NOMEM: | |
1126 | /* We ran out of memory, so we need to discard this | |
1127 | * packet. | |
1128 | */ | |
1129 | /* BUG--we should now recover some memory, probably by | |
1130 | * reneging... | |
1131 | */ | |
1132 | error = -ENOMEM; | |
1133 | break; | |
1134 | ||
d808ad9a | 1135 | case SCTP_DISPOSITION_DELETE_TCB: |
1da177e4 LT |
1136 | /* This should now be a command. */ |
1137 | break; | |
1138 | ||
1139 | case SCTP_DISPOSITION_CONSUME: | |
1140 | case SCTP_DISPOSITION_ABORT: | |
1141 | /* | |
1142 | * We should no longer have much work to do here as the | |
1143 | * real work has been done as explicit commands above. | |
1144 | */ | |
1145 | break; | |
1146 | ||
1147 | case SCTP_DISPOSITION_VIOLATION: | |
d99fa429 WY |
1148 | if (net_ratelimit()) |
1149 | printk(KERN_ERR "sctp protocol violation state %d " | |
1150 | "chunkid %d\n", state, subtype.chunk); | |
1da177e4 LT |
1151 | break; |
1152 | ||
1153 | case SCTP_DISPOSITION_NOT_IMPL: | |
1154 | printk(KERN_WARNING "sctp unimplemented feature in state %d, " | |
1155 | "event_type %d, event_id %d\n", | |
1156 | state, event_type, subtype.chunk); | |
1157 | break; | |
1158 | ||
1159 | case SCTP_DISPOSITION_BUG: | |
1160 | printk(KERN_ERR "sctp bug in state %d, " | |
1161 | "event_type %d, event_id %d\n", | |
1162 | state, event_type, subtype.chunk); | |
1163 | BUG(); | |
1164 | break; | |
1165 | ||
1166 | default: | |
1167 | printk(KERN_ERR "sctp impossible disposition %d " | |
1168 | "in state %d, event_type %d, event_id %d\n", | |
1169 | status, state, event_type, subtype.chunk); | |
1170 | BUG(); | |
1171 | break; | |
3ff50b79 | 1172 | } |
1da177e4 LT |
1173 | |
1174 | bail: | |
1175 | return error; | |
1176 | } | |
1177 | ||
1178 | /******************************************************************** | |
1179 | * 2nd Level Abstractions | |
1180 | ********************************************************************/ | |
1181 | ||
1182 | /* This is the side-effect interpreter. */ | |
1183 | static int sctp_cmd_interpreter(sctp_event_t event_type, | |
1184 | sctp_subtype_t subtype, | |
1185 | sctp_state_t state, | |
1186 | struct sctp_endpoint *ep, | |
1187 | struct sctp_association *asoc, | |
1188 | void *event_arg, | |
d808ad9a | 1189 | sctp_disposition_t status, |
1da177e4 | 1190 | sctp_cmd_seq_t *commands, |
dd0fc66f | 1191 | gfp_t gfp) |
1da177e4 LT |
1192 | { |
1193 | int error = 0; | |
1194 | int force; | |
1195 | sctp_cmd_t *cmd; | |
1196 | struct sctp_chunk *new_obj; | |
1197 | struct sctp_chunk *chunk = NULL; | |
1198 | struct sctp_packet *packet; | |
1da177e4 LT |
1199 | struct timer_list *timer; |
1200 | unsigned long timeout; | |
1201 | struct sctp_transport *t; | |
1202 | struct sctp_sackhdr sackh; | |
1203 | int local_cork = 0; | |
1204 | ||
1205 | if (SCTP_EVENT_T_TIMEOUT != event_type) | |
1206 | chunk = (struct sctp_chunk *) event_arg; | |
1207 | ||
1208 | /* Note: This whole file is a huge candidate for rework. | |
1209 | * For example, each command could either have its own handler, so | |
1210 | * the loop would look like: | |
1211 | * while (cmds) | |
1212 | * cmd->handle(x, y, z) | |
1213 | * --jgrimm | |
1214 | */ | |
1215 | while (NULL != (cmd = sctp_next_cmd(commands))) { | |
1216 | switch (cmd->verb) { | |
1217 | case SCTP_CMD_NOP: | |
1218 | /* Do nothing. */ | |
1219 | break; | |
1220 | ||
1221 | case SCTP_CMD_NEW_ASOC: | |
1222 | /* Register a new association. */ | |
1223 | if (local_cork) { | |
d808ad9a | 1224 | sctp_outq_uncork(&asoc->outqueue); |
1da177e4 LT |
1225 | local_cork = 0; |
1226 | } | |
1227 | asoc = cmd->obj.ptr; | |
1228 | /* Register with the endpoint. */ | |
1229 | sctp_endpoint_add_asoc(ep, asoc); | |
1230 | sctp_hash_established(asoc); | |
1231 | break; | |
1232 | ||
1233 | case SCTP_CMD_UPDATE_ASSOC: | |
1234 | sctp_assoc_update(asoc, cmd->obj.ptr); | |
1235 | break; | |
1236 | ||
1237 | case SCTP_CMD_PURGE_OUTQUEUE: | |
1238 | sctp_outq_teardown(&asoc->outqueue); | |
1239 | break; | |
1240 | ||
d808ad9a | 1241 | case SCTP_CMD_DELETE_TCB: |
1da177e4 LT |
1242 | if (local_cork) { |
1243 | sctp_outq_uncork(&asoc->outqueue); | |
1244 | local_cork = 0; | |
1245 | } | |
1246 | /* Delete the current association. */ | |
1247 | sctp_cmd_delete_tcb(commands, asoc); | |
1248 | asoc = NULL; | |
1249 | break; | |
1250 | ||
1251 | case SCTP_CMD_NEW_STATE: | |
1252 | /* Enter a new state. */ | |
1253 | sctp_cmd_new_state(commands, asoc, cmd->obj.state); | |
1254 | break; | |
1255 | ||
1256 | case SCTP_CMD_REPORT_TSN: | |
1257 | /* Record the arrival of a TSN. */ | |
8e1ee18c VY |
1258 | error = sctp_tsnmap_mark(&asoc->peer.tsn_map, |
1259 | cmd->obj.u32); | |
1da177e4 LT |
1260 | break; |
1261 | ||
1262 | case SCTP_CMD_REPORT_FWDTSN: | |
1263 | /* Move the Cumulattive TSN Ack ahead. */ | |
1264 | sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32); | |
1265 | ||
ea2dfb37 VY |
1266 | /* purge the fragmentation queue */ |
1267 | sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32); | |
1268 | ||
1da177e4 LT |
1269 | /* Abort any in progress partial delivery. */ |
1270 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); | |
1271 | break; | |
1272 | ||
1273 | case SCTP_CMD_PROCESS_FWDTSN: | |
1274 | sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.ptr); | |
d808ad9a | 1275 | break; |
1da177e4 LT |
1276 | |
1277 | case SCTP_CMD_GEN_SACK: | |
1278 | /* Generate a Selective ACK. | |
1279 | * The argument tells us whether to just count | |
1280 | * the packet and MAYBE generate a SACK, or | |
1281 | * force a SACK out. | |
1282 | */ | |
1283 | force = cmd->obj.i32; | |
1284 | error = sctp_gen_sack(asoc, force, commands); | |
1285 | break; | |
1286 | ||
1287 | case SCTP_CMD_PROCESS_SACK: | |
1288 | /* Process an inbound SACK. */ | |
1289 | error = sctp_cmd_process_sack(commands, asoc, | |
1290 | cmd->obj.ptr); | |
1291 | break; | |
1292 | ||
1293 | case SCTP_CMD_GEN_INIT_ACK: | |
1294 | /* Generate an INIT ACK chunk. */ | |
1295 | new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC, | |
1296 | 0); | |
1297 | if (!new_obj) | |
1298 | goto nomem; | |
1299 | ||
1300 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1301 | SCTP_CHUNK(new_obj)); | |
1302 | break; | |
1303 | ||
1304 | case SCTP_CMD_PEER_INIT: | |
1305 | /* Process a unified INIT from the peer. | |
1306 | * Note: Only used during INIT-ACK processing. If | |
1307 | * there is an error just return to the outter | |
1308 | * layer which will bail. | |
1309 | */ | |
1310 | error = sctp_cmd_process_init(commands, asoc, chunk, | |
1311 | cmd->obj.ptr, gfp); | |
1312 | break; | |
1313 | ||
1314 | case SCTP_CMD_GEN_COOKIE_ECHO: | |
1315 | /* Generate a COOKIE ECHO chunk. */ | |
1316 | new_obj = sctp_make_cookie_echo(asoc, chunk); | |
1317 | if (!new_obj) { | |
1318 | if (cmd->obj.ptr) | |
1319 | sctp_chunk_free(cmd->obj.ptr); | |
1320 | goto nomem; | |
1321 | } | |
1322 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1323 | SCTP_CHUNK(new_obj)); | |
1324 | ||
1325 | /* If there is an ERROR chunk to be sent along with | |
1326 | * the COOKIE_ECHO, send it, too. | |
1327 | */ | |
1328 | if (cmd->obj.ptr) | |
1329 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1330 | SCTP_CHUNK(cmd->obj.ptr)); | |
1331 | ||
96cd0d3d VY |
1332 | if (new_obj->transport) { |
1333 | new_obj->transport->init_sent_count++; | |
1334 | asoc->init_last_sent_to = new_obj->transport; | |
1335 | } | |
1336 | ||
1da177e4 | 1337 | /* FIXME - Eventually come up with a cleaner way to |
d808ad9a YH |
1338 | * enabling COOKIE-ECHO + DATA bundling during |
1339 | * multihoming stale cookie scenarios, the following | |
1340 | * command plays with asoc->peer.retran_path to | |
1341 | * avoid the problem of sending the COOKIE-ECHO and | |
1342 | * DATA in different paths, which could result | |
1343 | * in the association being ABORTed if the DATA chunk | |
1da177e4 LT |
1344 | * is processed first by the server. Checking the |
1345 | * init error counter simply causes this command | |
1346 | * to be executed only during failed attempts of | |
1347 | * association establishment. | |
1348 | */ | |
3f7a87d2 FF |
1349 | if ((asoc->peer.retran_path != |
1350 | asoc->peer.primary_path) && | |
1351 | (asoc->init_err_counter > 0)) { | |
1352 | sctp_add_cmd_sf(commands, | |
d808ad9a | 1353 | SCTP_CMD_FORCE_PRIM_RETRAN, |
1da177e4 LT |
1354 | SCTP_NULL()); |
1355 | } | |
1356 | ||
1357 | break; | |
1358 | ||
1359 | case SCTP_CMD_GEN_SHUTDOWN: | |
1360 | /* Generate SHUTDOWN when in SHUTDOWN_SENT state. | |
1361 | * Reset error counts. | |
1362 | */ | |
1363 | asoc->overall_error_count = 0; | |
1364 | ||
1365 | /* Generate a SHUTDOWN chunk. */ | |
1366 | new_obj = sctp_make_shutdown(asoc, chunk); | |
1367 | if (!new_obj) | |
1368 | goto nomem; | |
1369 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1370 | SCTP_CHUNK(new_obj)); | |
1371 | break; | |
1372 | ||
1373 | case SCTP_CMD_CHUNK_ULP: | |
1374 | /* Send a chunk to the sockets layer. */ | |
1375 | SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n", | |
1376 | "chunk_up:", cmd->obj.ptr, | |
1377 | "ulpq:", &asoc->ulpq); | |
1378 | sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.ptr, | |
1379 | GFP_ATOMIC); | |
1380 | break; | |
1381 | ||
1382 | case SCTP_CMD_EVENT_ULP: | |
1383 | /* Send a notification to the sockets layer. */ | |
1384 | SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n", | |
1385 | "event_up:",cmd->obj.ptr, | |
1386 | "ulpq:",&asoc->ulpq); | |
1387 | sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ptr); | |
1388 | break; | |
1389 | ||
1390 | case SCTP_CMD_REPLY: | |
1391 | /* If an caller has not already corked, do cork. */ | |
1392 | if (!asoc->outqueue.cork) { | |
1393 | sctp_outq_cork(&asoc->outqueue); | |
1394 | local_cork = 1; | |
1395 | } | |
1396 | /* Send a chunk to our peer. */ | |
1397 | error = sctp_outq_tail(&asoc->outqueue, cmd->obj.ptr); | |
1398 | break; | |
1399 | ||
1400 | case SCTP_CMD_SEND_PKT: | |
1401 | /* Send a full packet to our peer. */ | |
1402 | packet = cmd->obj.ptr; | |
1403 | sctp_packet_transmit(packet); | |
1404 | sctp_ootb_pkt_free(packet); | |
1405 | break; | |
1406 | ||
b6157d8e VY |
1407 | case SCTP_CMD_T1_RETRAN: |
1408 | /* Mark a transport for retransmission. */ | |
1409 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1410 | SCTP_RTXR_T1_RTX); | |
1411 | break; | |
1412 | ||
1da177e4 LT |
1413 | case SCTP_CMD_RETRAN: |
1414 | /* Mark a transport for retransmission. */ | |
1415 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1416 | SCTP_RTXR_T3_RTX); | |
1417 | break; | |
1418 | ||
1419 | case SCTP_CMD_TRANSMIT: | |
1420 | /* Kick start transmission. */ | |
1421 | error = sctp_outq_uncork(&asoc->outqueue); | |
1422 | local_cork = 0; | |
1423 | break; | |
1424 | ||
1425 | case SCTP_CMD_ECN_CE: | |
1426 | /* Do delayed CE processing. */ | |
1427 | sctp_do_ecn_ce_work(asoc, cmd->obj.u32); | |
1428 | break; | |
1429 | ||
1430 | case SCTP_CMD_ECN_ECNE: | |
1431 | /* Do delayed ECNE processing. */ | |
1432 | new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32, | |
1433 | chunk); | |
1434 | if (new_obj) | |
1435 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1436 | SCTP_CHUNK(new_obj)); | |
1437 | break; | |
1438 | ||
1439 | case SCTP_CMD_ECN_CWR: | |
1440 | /* Do delayed CWR processing. */ | |
1441 | sctp_do_ecn_cwr_work(asoc, cmd->obj.u32); | |
1442 | break; | |
1443 | ||
1444 | case SCTP_CMD_SETUP_T2: | |
1445 | sctp_cmd_setup_t2(commands, asoc, cmd->obj.ptr); | |
1446 | break; | |
1447 | ||
1448 | case SCTP_CMD_TIMER_START: | |
1449 | timer = &asoc->timers[cmd->obj.to]; | |
1450 | timeout = asoc->timeouts[cmd->obj.to]; | |
09a62660 | 1451 | BUG_ON(!timeout); |
1da177e4 LT |
1452 | |
1453 | timer->expires = jiffies + timeout; | |
1454 | sctp_association_hold(asoc); | |
1455 | add_timer(timer); | |
1456 | break; | |
1457 | ||
1458 | case SCTP_CMD_TIMER_RESTART: | |
1459 | timer = &asoc->timers[cmd->obj.to]; | |
1460 | timeout = asoc->timeouts[cmd->obj.to]; | |
1461 | if (!mod_timer(timer, jiffies + timeout)) | |
1462 | sctp_association_hold(asoc); | |
1463 | break; | |
1464 | ||
1465 | case SCTP_CMD_TIMER_STOP: | |
1466 | timer = &asoc->timers[cmd->obj.to]; | |
1467 | if (timer_pending(timer) && del_timer(timer)) | |
1468 | sctp_association_put(asoc); | |
1469 | break; | |
1470 | ||
3f7a87d2 FF |
1471 | case SCTP_CMD_INIT_CHOOSE_TRANSPORT: |
1472 | chunk = cmd->obj.ptr; | |
9919b455 WY |
1473 | t = sctp_assoc_choose_alter_transport(asoc, |
1474 | asoc->init_last_sent_to); | |
3f7a87d2 FF |
1475 | asoc->init_last_sent_to = t; |
1476 | chunk->transport = t; | |
1477 | t->init_sent_count++; | |
e0e9db17 VY |
1478 | /* Set the new transport as primary */ |
1479 | sctp_assoc_set_primary(asoc, t); | |
3f7a87d2 FF |
1480 | break; |
1481 | ||
1da177e4 LT |
1482 | case SCTP_CMD_INIT_RESTART: |
1483 | /* Do the needed accounting and updates | |
1484 | * associated with restarting an initialization | |
3f7a87d2 FF |
1485 | * timer. Only multiply the timeout by two if |
1486 | * all transports have been tried at the current | |
1487 | * timeout. | |
1488 | */ | |
96cd0d3d VY |
1489 | sctp_cmd_t1_timer_update(asoc, |
1490 | SCTP_EVENT_TIMEOUT_T1_INIT, | |
1491 | "INIT"); | |
3f7a87d2 FF |
1492 | |
1493 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
1494 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
1495 | break; | |
1496 | ||
1497 | case SCTP_CMD_COOKIEECHO_RESTART: | |
1498 | /* Do the needed accounting and updates | |
1499 | * associated with restarting an initialization | |
1500 | * timer. Only multiply the timeout by two if | |
1501 | * all transports have been tried at the current | |
1502 | * timeout. | |
1da177e4 | 1503 | */ |
96cd0d3d VY |
1504 | sctp_cmd_t1_timer_update(asoc, |
1505 | SCTP_EVENT_TIMEOUT_T1_COOKIE, | |
1506 | "COOKIE"); | |
1da177e4 LT |
1507 | |
1508 | /* If we've sent any data bundled with | |
1509 | * COOKIE-ECHO we need to resend. | |
1510 | */ | |
9dbc15f0 RD |
1511 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1512 | transports) { | |
b6157d8e VY |
1513 | sctp_retransmit_mark(&asoc->outqueue, t, |
1514 | SCTP_RTXR_T1_RTX); | |
1da177e4 LT |
1515 | } |
1516 | ||
1517 | sctp_add_cmd_sf(commands, | |
1518 | SCTP_CMD_TIMER_RESTART, | |
3f7a87d2 | 1519 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); |
1da177e4 LT |
1520 | break; |
1521 | ||
1522 | case SCTP_CMD_INIT_FAILED: | |
dc251b2b | 1523 | sctp_cmd_init_failed(commands, asoc, cmd->obj.err); |
1da177e4 LT |
1524 | break; |
1525 | ||
1526 | case SCTP_CMD_ASSOC_FAILED: | |
1527 | sctp_cmd_assoc_failed(commands, asoc, event_type, | |
5be291fe | 1528 | subtype, chunk, cmd->obj.err); |
1da177e4 LT |
1529 | break; |
1530 | ||
3f7a87d2 FF |
1531 | case SCTP_CMD_INIT_COUNTER_INC: |
1532 | asoc->init_err_counter++; | |
1da177e4 LT |
1533 | break; |
1534 | ||
3f7a87d2 FF |
1535 | case SCTP_CMD_INIT_COUNTER_RESET: |
1536 | asoc->init_err_counter = 0; | |
1537 | asoc->init_cycle = 0; | |
96cd0d3d VY |
1538 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1539 | transports) { | |
1540 | t->init_sent_count = 0; | |
1541 | } | |
1da177e4 LT |
1542 | break; |
1543 | ||
1544 | case SCTP_CMD_REPORT_DUP: | |
1545 | sctp_tsnmap_mark_dup(&asoc->peer.tsn_map, | |
1546 | cmd->obj.u32); | |
1547 | break; | |
1548 | ||
1549 | case SCTP_CMD_REPORT_BAD_TAG: | |
1550 | SCTP_DEBUG_PRINTK("vtag mismatch!\n"); | |
1551 | break; | |
1552 | ||
1553 | case SCTP_CMD_STRIKE: | |
1554 | /* Mark one strike against a transport. */ | |
7e99013a VY |
1555 | sctp_do_8_2_transport_strike(asoc, cmd->obj.transport, |
1556 | 0); | |
1557 | break; | |
1558 | ||
1559 | case SCTP_CMD_TRANSPORT_IDLE: | |
1560 | t = cmd->obj.transport; | |
1561 | sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE); | |
1da177e4 LT |
1562 | break; |
1563 | ||
7e99013a | 1564 | case SCTP_CMD_TRANSPORT_HB_SENT: |
1da177e4 | 1565 | t = cmd->obj.transport; |
7e99013a VY |
1566 | sctp_do_8_2_transport_strike(asoc, t, 1); |
1567 | t->hb_sent = 1; | |
1da177e4 LT |
1568 | break; |
1569 | ||
1570 | case SCTP_CMD_TRANSPORT_ON: | |
1571 | t = cmd->obj.transport; | |
1572 | sctp_cmd_transport_on(commands, asoc, t, chunk); | |
1573 | break; | |
1574 | ||
1575 | case SCTP_CMD_HB_TIMERS_START: | |
1576 | sctp_cmd_hb_timers_start(commands, asoc); | |
1577 | break; | |
1578 | ||
1579 | case SCTP_CMD_HB_TIMER_UPDATE: | |
1580 | t = cmd->obj.transport; | |
765ff02e | 1581 | sctp_cmd_hb_timer_update(commands, t); |
1da177e4 LT |
1582 | break; |
1583 | ||
1584 | case SCTP_CMD_HB_TIMERS_STOP: | |
1585 | sctp_cmd_hb_timers_stop(commands, asoc); | |
1586 | break; | |
1587 | ||
1588 | case SCTP_CMD_REPORT_ERROR: | |
1589 | error = cmd->obj.error; | |
1590 | break; | |
1591 | ||
1592 | case SCTP_CMD_PROCESS_CTSN: | |
1593 | /* Dummy up a SACK for processing. */ | |
2178eda8 | 1594 | sackh.cum_tsn_ack = cmd->obj.be32; |
d4d6fb57 VY |
1595 | sackh.a_rwnd = asoc->peer.rwnd + |
1596 | asoc->outqueue.outstanding_bytes; | |
1da177e4 LT |
1597 | sackh.num_gap_ack_blocks = 0; |
1598 | sackh.num_dup_tsns = 0; | |
1599 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, | |
1600 | SCTP_SACKH(&sackh)); | |
1601 | break; | |
1602 | ||
1603 | case SCTP_CMD_DISCARD_PACKET: | |
2e3216cd VY |
1604 | /* We need to discard the whole packet. |
1605 | * Uncork the queue since there might be | |
1606 | * responses pending | |
1607 | */ | |
1da177e4 | 1608 | chunk->pdiscard = 1; |
2e3216cd VY |
1609 | if (asoc) { |
1610 | sctp_outq_uncork(&asoc->outqueue); | |
1611 | local_cork = 0; | |
1612 | } | |
1da177e4 LT |
1613 | break; |
1614 | ||
1615 | case SCTP_CMD_RTO_PENDING: | |
1616 | t = cmd->obj.transport; | |
1617 | t->rto_pending = 1; | |
1618 | break; | |
1619 | ||
1620 | case SCTP_CMD_PART_DELIVER: | |
1621 | sctp_ulpq_partial_delivery(&asoc->ulpq, cmd->obj.ptr, | |
1622 | GFP_ATOMIC); | |
1623 | break; | |
1624 | ||
1625 | case SCTP_CMD_RENEGE: | |
1626 | sctp_ulpq_renege(&asoc->ulpq, cmd->obj.ptr, | |
1627 | GFP_ATOMIC); | |
1628 | break; | |
1629 | ||
1630 | case SCTP_CMD_SETUP_T4: | |
1631 | sctp_cmd_setup_t4(commands, asoc, cmd->obj.ptr); | |
1632 | break; | |
1633 | ||
1634 | case SCTP_CMD_PROCESS_OPERR: | |
1635 | sctp_cmd_process_operr(commands, asoc, chunk); | |
1636 | break; | |
1637 | case SCTP_CMD_CLEAR_INIT_TAG: | |
1638 | asoc->peer.i.init_tag = 0; | |
1639 | break; | |
1640 | case SCTP_CMD_DEL_NON_PRIMARY: | |
1641 | sctp_cmd_del_non_primary(asoc); | |
1642 | break; | |
1643 | case SCTP_CMD_T3_RTX_TIMERS_STOP: | |
1644 | sctp_cmd_t3_rtx_timers_stop(commands, asoc); | |
1645 | break; | |
1646 | case SCTP_CMD_FORCE_PRIM_RETRAN: | |
1647 | t = asoc->peer.retran_path; | |
1648 | asoc->peer.retran_path = asoc->peer.primary_path; | |
1649 | error = sctp_outq_uncork(&asoc->outqueue); | |
1650 | local_cork = 0; | |
1651 | asoc->peer.retran_path = t; | |
1652 | break; | |
8de8c873 SS |
1653 | case SCTP_CMD_SET_SK_ERR: |
1654 | sctp_cmd_set_sk_err(asoc, cmd->obj.error); | |
1655 | break; | |
07d93967 VY |
1656 | case SCTP_CMD_ASSOC_CHANGE: |
1657 | sctp_cmd_assoc_change(commands, asoc, | |
1658 | cmd->obj.u8); | |
1659 | break; | |
1660 | case SCTP_CMD_ADAPTATION_IND: | |
1661 | sctp_cmd_adaptation_ind(commands, asoc); | |
1662 | break; | |
1663 | ||
730fc3d0 VY |
1664 | case SCTP_CMD_ASSOC_SHKEY: |
1665 | error = sctp_auth_asoc_init_active_key(asoc, | |
1666 | GFP_ATOMIC); | |
1667 | break; | |
f4ad85ca GJ |
1668 | case SCTP_CMD_UPDATE_INITTAG: |
1669 | asoc->peer.i.init_tag = cmd->obj.u32; | |
1670 | break; | |
9c5c62be VY |
1671 | case SCTP_CMD_SEND_MSG: |
1672 | if (!asoc->outqueue.cork) { | |
1673 | sctp_outq_cork(&asoc->outqueue); | |
1674 | local_cork = 1; | |
1675 | } | |
1676 | error = sctp_cmd_send_msg(asoc, cmd->obj.msg); | |
1677 | break; | |
c0786693 VY |
1678 | case SCTP_CMD_SEND_NEXT_ASCONF: |
1679 | sctp_cmd_send_asconf(asoc); | |
1680 | break; | |
1da177e4 LT |
1681 | default: |
1682 | printk(KERN_WARNING "Impossible command: %u, %p\n", | |
1683 | cmd->verb, cmd->obj.ptr); | |
1684 | break; | |
3ff50b79 SH |
1685 | } |
1686 | ||
1da177e4 LT |
1687 | if (error) |
1688 | break; | |
1689 | } | |
1690 | ||
1691 | out: | |
2e3216cd VY |
1692 | /* If this is in response to a received chunk, wait until |
1693 | * we are done with the packet to open the queue so that we don't | |
1694 | * send multiple packets in response to a single request. | |
1695 | */ | |
1696 | if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) { | |
1697 | if (chunk->end_of_packet || chunk->singleton) | |
d4d6fb57 | 1698 | error = sctp_outq_uncork(&asoc->outqueue); |
2e3216cd | 1699 | } else if (local_cork) |
d4d6fb57 | 1700 | error = sctp_outq_uncork(&asoc->outqueue); |
1da177e4 LT |
1701 | return error; |
1702 | nomem: | |
1703 | error = -ENOMEM; | |
1704 | goto out; | |
1705 | } | |
1706 |