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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 | ||
145ce502 JP |
50 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
51 | ||
1da177e4 LT |
52 | #include <linux/skbuff.h> |
53 | #include <linux/types.h> | |
54 | #include <linux/socket.h> | |
55 | #include <linux/ip.h> | |
5a0e3ad6 | 56 | #include <linux/gfp.h> |
1da177e4 LT |
57 | #include <net/sock.h> |
58 | #include <net/sctp/sctp.h> | |
59 | #include <net/sctp/sm.h> | |
60 | ||
61 | static int sctp_cmd_interpreter(sctp_event_t event_type, | |
62 | sctp_subtype_t subtype, | |
63 | sctp_state_t state, | |
64 | struct sctp_endpoint *ep, | |
65 | struct sctp_association *asoc, | |
66 | void *event_arg, | |
d808ad9a | 67 | sctp_disposition_t status, |
1da177e4 | 68 | sctp_cmd_seq_t *commands, |
dd0fc66f | 69 | gfp_t gfp); |
1da177e4 LT |
70 | static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, |
71 | sctp_state_t state, | |
72 | struct sctp_endpoint *ep, | |
73 | struct sctp_association *asoc, | |
74 | void *event_arg, | |
75 | sctp_disposition_t status, | |
76 | sctp_cmd_seq_t *commands, | |
dd0fc66f | 77 | gfp_t gfp); |
1da177e4 | 78 | |
5aa93bcf NH |
79 | static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds, |
80 | struct sctp_transport *t); | |
1da177e4 LT |
81 | /******************************************************************** |
82 | * Helper functions | |
83 | ********************************************************************/ | |
84 | ||
85 | /* A helper function for delayed processing of INET ECN CE bit. */ | |
d808ad9a | 86 | static void sctp_do_ecn_ce_work(struct sctp_association *asoc, |
1da177e4 LT |
87 | __u32 lowest_tsn) |
88 | { | |
89 | /* Save the TSN away for comparison when we receive CWR */ | |
90 | ||
91 | asoc->last_ecne_tsn = lowest_tsn; | |
92 | asoc->need_ecne = 1; | |
93 | } | |
94 | ||
95 | /* Helper function for delayed processing of SCTP ECNE chunk. */ | |
96 | /* RFC 2960 Appendix A | |
97 | * | |
98 | * RFC 2481 details a specific bit for a sender to send in | |
99 | * the header of its next outbound TCP segment to indicate to | |
100 | * its peer that it has reduced its congestion window. This | |
101 | * is termed the CWR bit. For SCTP the same indication is made | |
102 | * by including the CWR chunk. This chunk contains one data | |
103 | * element, i.e. the TSN number that was sent in the ECNE chunk. | |
104 | * This element represents the lowest TSN number in the datagram | |
105 | * that was originally marked with the CE bit. | |
106 | */ | |
107 | static struct sctp_chunk *sctp_do_ecn_ecne_work(struct sctp_association *asoc, | |
108 | __u32 lowest_tsn, | |
109 | struct sctp_chunk *chunk) | |
110 | { | |
111 | struct sctp_chunk *repl; | |
112 | ||
113 | /* Our previously transmitted packet ran into some congestion | |
114 | * so we should take action by reducing cwnd and ssthresh | |
115 | * and then ACK our peer that we we've done so by | |
116 | * sending a CWR. | |
117 | */ | |
118 | ||
119 | /* First, try to determine if we want to actually lower | |
120 | * our cwnd variables. Only lower them if the ECNE looks more | |
121 | * recent than the last response. | |
122 | */ | |
123 | if (TSN_lt(asoc->last_cwr_tsn, lowest_tsn)) { | |
124 | struct sctp_transport *transport; | |
125 | ||
126 | /* Find which transport's congestion variables | |
127 | * need to be adjusted. | |
128 | */ | |
129 | transport = sctp_assoc_lookup_tsn(asoc, lowest_tsn); | |
130 | ||
131 | /* Update the congestion variables. */ | |
132 | if (transport) | |
133 | sctp_transport_lower_cwnd(transport, | |
134 | SCTP_LOWER_CWND_ECNE); | |
135 | asoc->last_cwr_tsn = lowest_tsn; | |
136 | } | |
137 | ||
138 | /* Always try to quiet the other end. In case of lost CWR, | |
139 | * resend last_cwr_tsn. | |
140 | */ | |
141 | repl = sctp_make_cwr(asoc, asoc->last_cwr_tsn, chunk); | |
142 | ||
143 | /* If we run out of memory, it will look like a lost CWR. We'll | |
144 | * get back in sync eventually. | |
145 | */ | |
146 | return repl; | |
147 | } | |
148 | ||
149 | /* Helper function to do delayed processing of ECN CWR chunk. */ | |
150 | static void sctp_do_ecn_cwr_work(struct sctp_association *asoc, | |
151 | __u32 lowest_tsn) | |
152 | { | |
153 | /* Turn off ECNE getting auto-prepended to every outgoing | |
154 | * packet | |
155 | */ | |
156 | asoc->need_ecne = 0; | |
157 | } | |
158 | ||
159 | /* Generate SACK if necessary. We call this at the end of a packet. */ | |
160 | static int sctp_gen_sack(struct sctp_association *asoc, int force, | |
161 | sctp_cmd_seq_t *commands) | |
162 | { | |
163 | __u32 ctsn, max_tsn_seen; | |
164 | struct sctp_chunk *sack; | |
52ccb8e9 | 165 | struct sctp_transport *trans = asoc->peer.last_data_from; |
1da177e4 LT |
166 | int error = 0; |
167 | ||
d808ad9a | 168 | if (force || |
52ccb8e9 FF |
169 | (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) || |
170 | (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE))) | |
1da177e4 LT |
171 | asoc->peer.sack_needed = 1; |
172 | ||
173 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); | |
174 | max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map); | |
175 | ||
176 | /* From 12.2 Parameters necessary per association (i.e. the TCB): | |
177 | * | |
178 | * Ack State : This flag indicates if the next received packet | |
179 | * : is to be responded to with a SACK. ... | |
180 | * : When DATA chunks are out of order, SACK's | |
181 | * : are not delayed (see Section 6). | |
182 | * | |
183 | * [This is actually not mentioned in Section 6, but we | |
184 | * implement it here anyway. --piggy] | |
185 | */ | |
d808ad9a | 186 | if (max_tsn_seen != ctsn) |
1da177e4 LT |
187 | asoc->peer.sack_needed = 1; |
188 | ||
189 | /* From 6.2 Acknowledgement on Reception of DATA Chunks: | |
190 | * | |
191 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, | |
192 | * an acknowledgement SHOULD be generated for at least every | |
193 | * second packet (not every second DATA chunk) received, and | |
194 | * SHOULD be generated within 200 ms of the arrival of any | |
195 | * unacknowledged DATA chunk. ... | |
196 | */ | |
197 | if (!asoc->peer.sack_needed) { | |
d364d927 | 198 | asoc->peer.sack_cnt++; |
52ccb8e9 FF |
199 | |
200 | /* Set the SACK delay timeout based on the | |
201 | * SACK delay for the last transport | |
202 | * data was received from, or the default | |
203 | * for the association. | |
204 | */ | |
d364d927 WY |
205 | if (trans) { |
206 | /* We will need a SACK for the next packet. */ | |
207 | if (asoc->peer.sack_cnt >= trans->sackfreq - 1) | |
208 | asoc->peer.sack_needed = 1; | |
209 | ||
d808ad9a | 210 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
52ccb8e9 | 211 | trans->sackdelay; |
d364d927 WY |
212 | } else { |
213 | /* We will need a SACK for the next packet. */ | |
214 | if (asoc->peer.sack_cnt >= asoc->sackfreq - 1) | |
215 | asoc->peer.sack_needed = 1; | |
216 | ||
d808ad9a | 217 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
52ccb8e9 | 218 | asoc->sackdelay; |
d364d927 | 219 | } |
52ccb8e9 FF |
220 | |
221 | /* Restart the SACK timer. */ | |
222 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
223 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
1da177e4 | 224 | } else { |
90f2f531 | 225 | asoc->a_rwnd = asoc->rwnd; |
1da177e4 LT |
226 | sack = sctp_make_sack(asoc); |
227 | if (!sack) | |
228 | goto nomem; | |
229 | ||
230 | asoc->peer.sack_needed = 0; | |
d364d927 | 231 | asoc->peer.sack_cnt = 0; |
1da177e4 | 232 | |
732ba35e | 233 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack)); |
1da177e4 LT |
234 | |
235 | /* Stop the SACK timer. */ | |
236 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
237 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
238 | } | |
52ccb8e9 | 239 | |
1da177e4 LT |
240 | return error; |
241 | nomem: | |
242 | error = -ENOMEM; | |
243 | return error; | |
244 | } | |
245 | ||
246 | /* When the T3-RTX timer expires, it calls this function to create the | |
247 | * relevant state machine event. | |
248 | */ | |
249 | void sctp_generate_t3_rtx_event(unsigned long peer) | |
250 | { | |
251 | int error; | |
252 | struct sctp_transport *transport = (struct sctp_transport *) peer; | |
253 | struct sctp_association *asoc = transport->asoc; | |
55e26eb9 | 254 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
255 | |
256 | /* Check whether a task is in the sock. */ | |
257 | ||
258 | sctp_bh_lock_sock(asoc->base.sk); | |
259 | if (sock_owned_by_user(asoc->base.sk)) { | |
bb33381d | 260 | pr_debug("%s: sock is busy\n", __func__); |
1da177e4 LT |
261 | |
262 | /* Try again later. */ | |
263 | if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20))) | |
264 | sctp_transport_hold(transport); | |
265 | goto out_unlock; | |
266 | } | |
267 | ||
268 | /* Is this transport really dead and just waiting around for | |
269 | * the timer to let go of the reference? | |
270 | */ | |
271 | if (transport->dead) | |
272 | goto out_unlock; | |
273 | ||
274 | /* Run through the state machine. */ | |
55e26eb9 | 275 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
276 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX), |
277 | asoc->state, | |
278 | asoc->ep, asoc, | |
279 | transport, GFP_ATOMIC); | |
280 | ||
281 | if (error) | |
282 | asoc->base.sk->sk_err = -error; | |
283 | ||
284 | out_unlock: | |
285 | sctp_bh_unlock_sock(asoc->base.sk); | |
286 | sctp_transport_put(transport); | |
287 | } | |
288 | ||
289 | /* This is a sa interface for producing timeout events. It works | |
290 | * for timeouts which use the association as their parameter. | |
291 | */ | |
292 | static void sctp_generate_timeout_event(struct sctp_association *asoc, | |
293 | sctp_event_timeout_t timeout_type) | |
294 | { | |
55e26eb9 | 295 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
296 | int error = 0; |
297 | ||
298 | sctp_bh_lock_sock(asoc->base.sk); | |
299 | if (sock_owned_by_user(asoc->base.sk)) { | |
bb33381d DB |
300 | pr_debug("%s: sock is busy: timer %d\n", __func__, |
301 | timeout_type); | |
1da177e4 LT |
302 | |
303 | /* Try again later. */ | |
304 | if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20))) | |
305 | sctp_association_hold(asoc); | |
306 | goto out_unlock; | |
307 | } | |
308 | ||
309 | /* Is this association really dead and just waiting around for | |
310 | * the timer to let go of the reference? | |
311 | */ | |
312 | if (asoc->base.dead) | |
313 | goto out_unlock; | |
314 | ||
315 | /* Run through the state machine. */ | |
55e26eb9 | 316 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
317 | SCTP_ST_TIMEOUT(timeout_type), |
318 | asoc->state, asoc->ep, asoc, | |
319 | (void *)timeout_type, GFP_ATOMIC); | |
320 | ||
321 | if (error) | |
322 | asoc->base.sk->sk_err = -error; | |
323 | ||
324 | out_unlock: | |
325 | sctp_bh_unlock_sock(asoc->base.sk); | |
326 | sctp_association_put(asoc); | |
327 | } | |
328 | ||
329 | static void sctp_generate_t1_cookie_event(unsigned long data) | |
330 | { | |
331 | struct sctp_association *asoc = (struct sctp_association *) data; | |
332 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE); | |
333 | } | |
334 | ||
335 | static void sctp_generate_t1_init_event(unsigned long data) | |
336 | { | |
337 | struct sctp_association *asoc = (struct sctp_association *) data; | |
338 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT); | |
339 | } | |
340 | ||
341 | static void sctp_generate_t2_shutdown_event(unsigned long data) | |
342 | { | |
343 | struct sctp_association *asoc = (struct sctp_association *) data; | |
344 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN); | |
345 | } | |
346 | ||
347 | static void sctp_generate_t4_rto_event(unsigned long data) | |
348 | { | |
349 | struct sctp_association *asoc = (struct sctp_association *) data; | |
350 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO); | |
351 | } | |
352 | ||
353 | static void sctp_generate_t5_shutdown_guard_event(unsigned long data) | |
354 | { | |
d808ad9a YH |
355 | struct sctp_association *asoc = (struct sctp_association *)data; |
356 | sctp_generate_timeout_event(asoc, | |
1da177e4 LT |
357 | SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD); |
358 | ||
359 | } /* sctp_generate_t5_shutdown_guard_event() */ | |
360 | ||
361 | static void sctp_generate_autoclose_event(unsigned long data) | |
362 | { | |
363 | struct sctp_association *asoc = (struct sctp_association *) data; | |
364 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE); | |
365 | } | |
366 | ||
367 | /* Generate a heart beat event. If the sock is busy, reschedule. Make | |
368 | * sure that the transport is still valid. | |
369 | */ | |
370 | void sctp_generate_heartbeat_event(unsigned long data) | |
371 | { | |
372 | int error = 0; | |
373 | struct sctp_transport *transport = (struct sctp_transport *) data; | |
374 | struct sctp_association *asoc = transport->asoc; | |
55e26eb9 | 375 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
376 | |
377 | sctp_bh_lock_sock(asoc->base.sk); | |
378 | if (sock_owned_by_user(asoc->base.sk)) { | |
bb33381d | 379 | pr_debug("%s: sock is busy\n", __func__); |
1da177e4 LT |
380 | |
381 | /* Try again later. */ | |
382 | if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20))) | |
383 | sctp_transport_hold(transport); | |
384 | goto out_unlock; | |
385 | } | |
386 | ||
387 | /* Is this structure just waiting around for us to actually | |
388 | * get destroyed? | |
389 | */ | |
390 | if (transport->dead) | |
391 | goto out_unlock; | |
392 | ||
55e26eb9 | 393 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
394 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT), |
395 | asoc->state, asoc->ep, asoc, | |
396 | transport, GFP_ATOMIC); | |
397 | ||
d808ad9a | 398 | if (error) |
1da177e4 LT |
399 | asoc->base.sk->sk_err = -error; |
400 | ||
401 | out_unlock: | |
402 | sctp_bh_unlock_sock(asoc->base.sk); | |
403 | sctp_transport_put(transport); | |
404 | } | |
405 | ||
50b5d6ad VY |
406 | /* Handle the timeout of the ICMP protocol unreachable timer. Trigger |
407 | * the correct state machine transition that will close the association. | |
408 | */ | |
409 | void sctp_generate_proto_unreach_event(unsigned long data) | |
410 | { | |
411 | struct sctp_transport *transport = (struct sctp_transport *) data; | |
412 | struct sctp_association *asoc = transport->asoc; | |
55e26eb9 | 413 | struct net *net = sock_net(asoc->base.sk); |
50b5d6ad VY |
414 | |
415 | sctp_bh_lock_sock(asoc->base.sk); | |
416 | if (sock_owned_by_user(asoc->base.sk)) { | |
bb33381d | 417 | pr_debug("%s: sock is busy\n", __func__); |
50b5d6ad VY |
418 | |
419 | /* Try again later. */ | |
420 | if (!mod_timer(&transport->proto_unreach_timer, | |
421 | jiffies + (HZ/20))) | |
422 | sctp_association_hold(asoc); | |
423 | goto out_unlock; | |
424 | } | |
425 | ||
426 | /* Is this structure just waiting around for us to actually | |
427 | * get destroyed? | |
428 | */ | |
429 | if (asoc->base.dead) | |
430 | goto out_unlock; | |
431 | ||
55e26eb9 | 432 | sctp_do_sm(net, SCTP_EVENT_T_OTHER, |
50b5d6ad VY |
433 | SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH), |
434 | asoc->state, asoc->ep, asoc, transport, GFP_ATOMIC); | |
435 | ||
436 | out_unlock: | |
437 | sctp_bh_unlock_sock(asoc->base.sk); | |
438 | sctp_association_put(asoc); | |
439 | } | |
440 | ||
441 | ||
1da177e4 LT |
442 | /* Inject a SACK Timeout event into the state machine. */ |
443 | static void sctp_generate_sack_event(unsigned long data) | |
444 | { | |
445 | struct sctp_association *asoc = (struct sctp_association *) data; | |
446 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK); | |
447 | } | |
448 | ||
449 | sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = { | |
450 | NULL, | |
451 | sctp_generate_t1_cookie_event, | |
452 | sctp_generate_t1_init_event, | |
453 | sctp_generate_t2_shutdown_event, | |
454 | NULL, | |
455 | sctp_generate_t4_rto_event, | |
456 | sctp_generate_t5_shutdown_guard_event, | |
1e7d3d90 | 457 | NULL, |
1da177e4 LT |
458 | sctp_generate_sack_event, |
459 | sctp_generate_autoclose_event, | |
460 | }; | |
461 | ||
462 | ||
463 | /* RFC 2960 8.2 Path Failure Detection | |
464 | * | |
465 | * When its peer endpoint is multi-homed, an endpoint should keep a | |
466 | * error counter for each of the destination transport addresses of the | |
467 | * peer endpoint. | |
468 | * | |
469 | * Each time the T3-rtx timer expires on any address, or when a | |
470 | * HEARTBEAT sent to an idle address is not acknowledged within a RTO, | |
471 | * the error counter of that destination address will be incremented. | |
472 | * When the value in the error counter exceeds the protocol parameter | |
473 | * 'Path.Max.Retrans' of that destination address, the endpoint should | |
474 | * mark the destination transport address as inactive, and a | |
475 | * notification SHOULD be sent to the upper layer. | |
476 | * | |
477 | */ | |
5aa93bcf NH |
478 | static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t *commands, |
479 | struct sctp_association *asoc, | |
7e99013a VY |
480 | struct sctp_transport *transport, |
481 | int is_hb) | |
1da177e4 LT |
482 | { |
483 | /* The check for association's overall error counter exceeding the | |
484 | * threshold is done in the state function. | |
485 | */ | |
b9f84786 VY |
486 | /* We are here due to a timer expiration. If the timer was |
487 | * not a HEARTBEAT, then normal error tracking is done. | |
488 | * If the timer was a heartbeat, we only increment error counts | |
489 | * when we already have an outstanding HEARTBEAT that has not | |
490 | * been acknowledged. | |
25985edc | 491 | * Additionally, some tranport states inhibit error increments. |
ad8fec17 | 492 | */ |
b9f84786 | 493 | if (!is_hb) { |
ad8fec17 | 494 | asoc->overall_error_count++; |
b9f84786 VY |
495 | if (transport->state != SCTP_INACTIVE) |
496 | transport->error_count++; | |
497 | } else if (transport->hb_sent) { | |
498 | if (transport->state != SCTP_UNCONFIRMED) | |
499 | asoc->overall_error_count++; | |
500 | if (transport->state != SCTP_INACTIVE) | |
501 | transport->error_count++; | |
502 | } | |
1da177e4 | 503 | |
5aa93bcf NH |
504 | /* If the transport error count is greater than the pf_retrans |
505 | * threshold, and less than pathmaxrtx, then mark this transport | |
506 | * as Partially Failed, ee SCTP Quick Failover Draft, secon 5.1, | |
507 | * point 1 | |
508 | */ | |
509 | if ((transport->state != SCTP_PF) && | |
510 | (asoc->pf_retrans < transport->pathmaxrxt) && | |
511 | (transport->error_count > asoc->pf_retrans)) { | |
512 | ||
513 | sctp_assoc_control_transport(asoc, transport, | |
514 | SCTP_TRANSPORT_PF, | |
515 | 0); | |
516 | ||
517 | /* Update the hb timer to resend a heartbeat every rto */ | |
518 | sctp_cmd_hb_timer_update(commands, transport); | |
519 | } | |
520 | ||
3f7a87d2 | 521 | if (transport->state != SCTP_INACTIVE && |
b9f84786 | 522 | (transport->error_count > transport->pathmaxrxt)) { |
bb33381d DB |
523 | pr_debug("%s: association:%p transport addr:%pISpc failed\n", |
524 | __func__, asoc, &transport->ipaddr.sa); | |
525 | ||
1da177e4 LT |
526 | sctp_assoc_control_transport(asoc, transport, |
527 | SCTP_TRANSPORT_DOWN, | |
528 | SCTP_FAILED_THRESHOLD); | |
529 | } | |
530 | ||
531 | /* E2) For the destination address for which the timer | |
532 | * expires, set RTO <- RTO * 2 ("back off the timer"). The | |
533 | * maximum value discussed in rule C7 above (RTO.max) may be | |
534 | * used to provide an upper bound to this doubling operation. | |
faee47cd VY |
535 | * |
536 | * Special Case: the first HB doesn't trigger exponential backoff. | |
3ad2f3fb | 537 | * The first unacknowledged HB triggers it. We do this with a flag |
faee47cd | 538 | * that indicates that we have an outstanding HB. |
1da177e4 | 539 | */ |
7e99013a | 540 | if (!is_hb || transport->hb_sent) { |
faee47cd | 541 | transport->rto = min((transport->rto * 2), transport->asoc->rto_max); |
196d6759 | 542 | sctp_max_rto(asoc, transport); |
faee47cd | 543 | } |
1da177e4 LT |
544 | } |
545 | ||
546 | /* Worker routine to handle INIT command failure. */ | |
547 | static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands, | |
548 | struct sctp_association *asoc, | |
95c96174 | 549 | unsigned int error) |
1da177e4 LT |
550 | { |
551 | struct sctp_ulpevent *event; | |
552 | ||
553 | event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC, | |
a5a35e76 | 554 | (__u16)error, 0, 0, NULL, |
1da177e4 LT |
555 | GFP_ATOMIC); |
556 | ||
557 | if (event) | |
558 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
559 | SCTP_ULPEVENT(event)); | |
560 | ||
561 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
562 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
563 | ||
564 | /* SEND_FAILED sent later when cleaning up the association. */ | |
565 | asoc->outqueue.error = error; | |
566 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
567 | } | |
568 | ||
569 | /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */ | |
570 | static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands, | |
571 | struct sctp_association *asoc, | |
572 | sctp_event_t event_type, | |
573 | sctp_subtype_t subtype, | |
574 | struct sctp_chunk *chunk, | |
95c96174 | 575 | unsigned int error) |
1da177e4 LT |
576 | { |
577 | struct sctp_ulpevent *event; | |
de4594a5 | 578 | struct sctp_chunk *abort; |
1da177e4 LT |
579 | /* Cancel any partial delivery in progress. */ |
580 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); | |
581 | ||
a5a35e76 VY |
582 | if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT) |
583 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
584 | (__u16)error, 0, 0, chunk, | |
585 | GFP_ATOMIC); | |
586 | else | |
587 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
588 | (__u16)error, 0, 0, NULL, | |
1da177e4 LT |
589 | GFP_ATOMIC); |
590 | if (event) | |
591 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
592 | SCTP_ULPEVENT(event)); | |
593 | ||
de4594a5 NH |
594 | if (asoc->overall_error_count >= asoc->max_retrans) { |
595 | abort = sctp_make_violation_max_retrans(asoc, chunk); | |
596 | if (abort) | |
597 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
598 | SCTP_CHUNK(abort)); | |
599 | } | |
600 | ||
1da177e4 LT |
601 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
602 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
603 | ||
1da177e4 LT |
604 | /* SEND_FAILED sent later when cleaning up the association. */ |
605 | asoc->outqueue.error = error; | |
606 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
607 | } | |
608 | ||
609 | /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT | |
610 | * inside the cookie. In reality, this is only used for INIT-ACK processing | |
611 | * since all other cases use "temporary" associations and can do all | |
612 | * their work in statefuns directly. | |
613 | */ | |
614 | static int sctp_cmd_process_init(sctp_cmd_seq_t *commands, | |
615 | struct sctp_association *asoc, | |
616 | struct sctp_chunk *chunk, | |
3182cd84 | 617 | sctp_init_chunk_t *peer_init, |
dd0fc66f | 618 | gfp_t gfp) |
1da177e4 LT |
619 | { |
620 | int error; | |
621 | ||
622 | /* We only process the init as a sideeffect in a single | |
623 | * case. This is when we process the INIT-ACK. If we | |
624 | * fail during INIT processing (due to malloc problems), | |
625 | * just return the error and stop processing the stack. | |
626 | */ | |
de6becdc | 627 | if (!sctp_process_init(asoc, chunk, sctp_source(chunk), peer_init, gfp)) |
1da177e4 LT |
628 | error = -ENOMEM; |
629 | else | |
630 | error = 0; | |
631 | ||
632 | return error; | |
633 | } | |
634 | ||
635 | /* Helper function to break out starting up of heartbeat timers. */ | |
636 | static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds, | |
637 | struct sctp_association *asoc) | |
638 | { | |
639 | struct sctp_transport *t; | |
1da177e4 LT |
640 | |
641 | /* Start a heartbeat timer for each transport on the association. | |
642 | * hold a reference on the transport to make sure none of | |
643 | * the needed data structures go away. | |
644 | */ | |
9dbc15f0 | 645 | list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) { |
1da177e4 LT |
646 | |
647 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) | |
648 | sctp_transport_hold(t); | |
649 | } | |
650 | } | |
651 | ||
652 | static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds, | |
653 | struct sctp_association *asoc) | |
654 | { | |
655 | struct sctp_transport *t; | |
1da177e4 LT |
656 | |
657 | /* Stop all heartbeat timers. */ | |
658 | ||
9dbc15f0 RD |
659 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
660 | transports) { | |
1da177e4 LT |
661 | if (del_timer(&t->hb_timer)) |
662 | sctp_transport_put(t); | |
663 | } | |
664 | } | |
665 | ||
666 | /* Helper function to stop any pending T3-RTX timers */ | |
667 | static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds, | |
d808ad9a | 668 | struct sctp_association *asoc) |
1da177e4 LT |
669 | { |
670 | struct sctp_transport *t; | |
1da177e4 | 671 | |
9dbc15f0 RD |
672 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
673 | transports) { | |
25cc4ae9 | 674 | if (del_timer(&t->T3_rtx_timer)) |
1da177e4 | 675 | sctp_transport_put(t); |
1da177e4 LT |
676 | } |
677 | } | |
678 | ||
679 | ||
680 | /* Helper function to update the heartbeat timer. */ | |
681 | static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds, | |
1da177e4 LT |
682 | struct sctp_transport *t) |
683 | { | |
684 | /* Update the heartbeat timer. */ | |
685 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) | |
686 | sctp_transport_hold(t); | |
687 | } | |
688 | ||
689 | /* Helper function to handle the reception of an HEARTBEAT ACK. */ | |
690 | static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds, | |
691 | struct sctp_association *asoc, | |
692 | struct sctp_transport *t, | |
693 | struct sctp_chunk *chunk) | |
694 | { | |
695 | sctp_sender_hb_info_t *hbinfo; | |
34d2d89f | 696 | int was_unconfirmed = 0; |
1da177e4 LT |
697 | |
698 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the | |
699 | * HEARTBEAT should clear the error counter of the destination | |
700 | * transport address to which the HEARTBEAT was sent. | |
1da177e4 LT |
701 | */ |
702 | t->error_count = 0; | |
f8d96052 TG |
703 | |
704 | /* | |
705 | * Although RFC4960 specifies that the overall error count must | |
706 | * be cleared when a HEARTBEAT ACK is received, we make an | |
707 | * exception while in SHUTDOWN PENDING. If the peer keeps its | |
708 | * window shut forever, we may never be able to transmit our | |
709 | * outstanding data and rely on the retransmission limit be reached | |
710 | * to shutdown the association. | |
711 | */ | |
712 | if (t->asoc->state != SCTP_STATE_SHUTDOWN_PENDING) | |
713 | t->asoc->overall_error_count = 0; | |
1da177e4 | 714 | |
faee47cd VY |
715 | /* Clear the hb_sent flag to signal that we had a good |
716 | * acknowledgement. | |
717 | */ | |
718 | t->hb_sent = 0; | |
719 | ||
1da177e4 LT |
720 | /* Mark the destination transport address as active if it is not so |
721 | * marked. | |
722 | */ | |
34d2d89f MH |
723 | if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) { |
724 | was_unconfirmed = 1; | |
1da177e4 LT |
725 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, |
726 | SCTP_HEARTBEAT_SUCCESS); | |
34d2d89f | 727 | } |
1da177e4 | 728 | |
5aa93bcf NH |
729 | if (t->state == SCTP_PF) |
730 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, | |
731 | SCTP_HEARTBEAT_SUCCESS); | |
732 | ||
8c2f414a DB |
733 | /* HB-ACK was received for a the proper HB. Consider this |
734 | * forward progress. | |
735 | */ | |
736 | if (t->dst) | |
737 | dst_confirm(t->dst); | |
738 | ||
1da177e4 LT |
739 | /* The receiver of the HEARTBEAT ACK should also perform an |
740 | * RTT measurement for that destination transport address | |
741 | * using the time value carried in the HEARTBEAT ACK chunk. | |
e533ca16 VY |
742 | * If the transport's rto_pending variable has been cleared, |
743 | * it was most likely due to a retransmit. However, we want | |
744 | * to re-enable it to properly update the rto. | |
1da177e4 | 745 | */ |
e533ca16 VY |
746 | if (t->rto_pending == 0) |
747 | t->rto_pending = 1; | |
748 | ||
1da177e4 LT |
749 | hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data; |
750 | sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at)); | |
ad8fec17 SS |
751 | |
752 | /* Update the heartbeat timer. */ | |
753 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) | |
754 | sctp_transport_hold(t); | |
34d2d89f MH |
755 | |
756 | if (was_unconfirmed && asoc->peer.transport_count == 1) | |
757 | sctp_transport_immediate_rtx(t); | |
1da177e4 LT |
758 | } |
759 | ||
1da177e4 LT |
760 | |
761 | /* Helper function to process the process SACK command. */ | |
762 | static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds, | |
763 | struct sctp_association *asoc, | |
edfee033 | 764 | struct sctp_chunk *chunk) |
1da177e4 | 765 | { |
2e3216cd | 766 | int err = 0; |
1da177e4 | 767 | |
edfee033 | 768 | if (sctp_outq_sack(&asoc->outqueue, chunk)) { |
55e26eb9 EB |
769 | struct net *net = sock_net(asoc->base.sk); |
770 | ||
1da177e4 | 771 | /* There are no more TSNs awaiting SACK. */ |
55e26eb9 | 772 | err = sctp_do_sm(net, SCTP_EVENT_T_OTHER, |
1da177e4 LT |
773 | SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN), |
774 | asoc->state, asoc->ep, asoc, NULL, | |
775 | GFP_ATOMIC); | |
1da177e4 LT |
776 | } |
777 | ||
778 | return err; | |
779 | } | |
780 | ||
781 | /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set | |
782 | * the transport for a shutdown chunk. | |
783 | */ | |
d808ad9a | 784 | static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds, |
1da177e4 LT |
785 | struct sctp_association *asoc, |
786 | struct sctp_chunk *chunk) | |
787 | { | |
788 | struct sctp_transport *t; | |
789 | ||
c17b02b3 VY |
790 | if (chunk->transport) |
791 | t = chunk->transport; | |
792 | else { | |
793 | t = sctp_assoc_choose_alter_transport(asoc, | |
9919b455 | 794 | asoc->shutdown_last_sent_to); |
c17b02b3 VY |
795 | chunk->transport = t; |
796 | } | |
1da177e4 LT |
797 | asoc->shutdown_last_sent_to = t; |
798 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto; | |
1da177e4 LT |
799 | } |
800 | ||
801 | /* Helper function to change the state of an association. */ | |
d808ad9a | 802 | static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds, |
1da177e4 LT |
803 | struct sctp_association *asoc, |
804 | sctp_state_t state) | |
805 | { | |
806 | struct sock *sk = asoc->base.sk; | |
807 | ||
808 | asoc->state = state; | |
809 | ||
bb33381d | 810 | pr_debug("%s: asoc:%p[%s]\n", __func__, asoc, sctp_state_tbl[state]); |
3f7a87d2 | 811 | |
1da177e4 | 812 | if (sctp_style(sk, TCP)) { |
3f7a87d2 | 813 | /* Change the sk->sk_state of a TCP-style socket that has |
af901ca1 | 814 | * successfully completed a connect() call. |
1da177e4 LT |
815 | */ |
816 | if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED)) | |
817 | sk->sk_state = SCTP_SS_ESTABLISHED; | |
818 | ||
819 | /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */ | |
820 | if (sctp_state(asoc, SHUTDOWN_RECEIVED) && | |
821 | sctp_sstate(sk, ESTABLISHED)) | |
822 | sk->sk_shutdown |= RCV_SHUTDOWN; | |
823 | } | |
824 | ||
3f7a87d2 FF |
825 | if (sctp_state(asoc, COOKIE_WAIT)) { |
826 | /* Reset init timeouts since they may have been | |
827 | * increased due to timer expirations. | |
828 | */ | |
829 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = | |
1e7d3d90 | 830 | asoc->rto_initial; |
3f7a87d2 | 831 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = |
1e7d3d90 | 832 | asoc->rto_initial; |
3f7a87d2 FF |
833 | } |
834 | ||
1da177e4 LT |
835 | if (sctp_state(asoc, ESTABLISHED) || |
836 | sctp_state(asoc, CLOSED) || | |
837 | sctp_state(asoc, SHUTDOWN_RECEIVED)) { | |
838 | /* Wake up any processes waiting in the asoc's wait queue in | |
839 | * sctp_wait_for_connect() or sctp_wait_for_sndbuf(). | |
d808ad9a | 840 | */ |
1da177e4 LT |
841 | if (waitqueue_active(&asoc->wait)) |
842 | wake_up_interruptible(&asoc->wait); | |
843 | ||
844 | /* Wake up any processes waiting in the sk's sleep queue of | |
845 | * a TCP-style or UDP-style peeled-off socket in | |
846 | * sctp_wait_for_accept() or sctp_wait_for_packet(). | |
847 | * For a UDP-style socket, the waiters are woken up by the | |
848 | * notifications. | |
849 | */ | |
850 | if (!sctp_style(sk, UDP)) | |
851 | sk->sk_state_change(sk); | |
852 | } | |
853 | } | |
854 | ||
855 | /* Helper function to delete an association. */ | |
856 | static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds, | |
857 | struct sctp_association *asoc) | |
858 | { | |
859 | struct sock *sk = asoc->base.sk; | |
860 | ||
861 | /* If it is a non-temporary association belonging to a TCP-style | |
d808ad9a | 862 | * listening socket that is not closed, do not free it so that accept() |
1da177e4 | 863 | * can pick it up later. |
d808ad9a | 864 | */ |
1da177e4 LT |
865 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) && |
866 | (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK)) | |
867 | return; | |
868 | ||
f9e42b85 | 869 | BUG_ON(asoc->peer.primary_path == NULL); |
1da177e4 LT |
870 | sctp_unhash_established(asoc); |
871 | sctp_association_free(asoc); | |
872 | } | |
873 | ||
874 | /* | |
875 | * ADDIP Section 4.1 ASCONF Chunk Procedures | |
876 | * A4) Start a T-4 RTO timer, using the RTO value of the selected | |
877 | * destination address (we use active path instead of primary path just | |
d808ad9a | 878 | * because primary path may be inactive. |
1da177e4 LT |
879 | */ |
880 | static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds, | |
881 | struct sctp_association *asoc, | |
882 | struct sctp_chunk *chunk) | |
883 | { | |
884 | struct sctp_transport *t; | |
885 | ||
9919b455 | 886 | t = sctp_assoc_choose_alter_transport(asoc, chunk->transport); |
1da177e4 LT |
887 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto; |
888 | chunk->transport = t; | |
889 | } | |
890 | ||
d808ad9a | 891 | /* Process an incoming Operation Error Chunk. */ |
1da177e4 LT |
892 | static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds, |
893 | struct sctp_association *asoc, | |
894 | struct sctp_chunk *chunk) | |
895 | { | |
1da177e4 | 896 | struct sctp_errhdr *err_hdr; |
3df26787 WY |
897 | struct sctp_ulpevent *ev; |
898 | ||
899 | while (chunk->chunk_end > chunk->skb->data) { | |
900 | err_hdr = (struct sctp_errhdr *)(chunk->skb->data); | |
901 | ||
902 | ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0, | |
903 | GFP_ATOMIC); | |
904 | if (!ev) | |
905 | return; | |
906 | ||
907 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
908 | ||
909 | switch (err_hdr->cause) { | |
910 | case SCTP_ERROR_UNKNOWN_CHUNK: | |
911 | { | |
912 | sctp_chunkhdr_t *unk_chunk_hdr; | |
913 | ||
914 | unk_chunk_hdr = (sctp_chunkhdr_t *)err_hdr->variable; | |
915 | switch (unk_chunk_hdr->type) { | |
916 | /* ADDIP 4.1 A9) If the peer responds to an ASCONF with | |
917 | * an ERROR chunk reporting that it did not recognized | |
918 | * the ASCONF chunk type, the sender of the ASCONF MUST | |
919 | * NOT send any further ASCONF chunks and MUST stop its | |
920 | * T-4 timer. | |
921 | */ | |
922 | case SCTP_CID_ASCONF: | |
923 | if (asoc->peer.asconf_capable == 0) | |
924 | break; | |
925 | ||
926 | asoc->peer.asconf_capable = 0; | |
927 | sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP, | |
1da177e4 | 928 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); |
3df26787 WY |
929 | break; |
930 | default: | |
931 | break; | |
932 | } | |
1da177e4 | 933 | break; |
3df26787 | 934 | } |
1da177e4 LT |
935 | default: |
936 | break; | |
937 | } | |
1da177e4 LT |
938 | } |
939 | } | |
940 | ||
941 | /* Process variable FWDTSN chunk information. */ | |
d808ad9a | 942 | static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq, |
1da177e4 LT |
943 | struct sctp_chunk *chunk) |
944 | { | |
945 | struct sctp_fwdtsn_skip *skip; | |
946 | /* Walk through all the skipped SSNs */ | |
947 | sctp_walk_fwdtsn(skip, chunk) { | |
948 | sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn)); | |
949 | } | |
1da177e4 LT |
950 | } |
951 | ||
d808ad9a | 952 | /* Helper function to remove the association non-primary peer |
1da177e4 | 953 | * transports. |
d808ad9a | 954 | */ |
1da177e4 LT |
955 | static void sctp_cmd_del_non_primary(struct sctp_association *asoc) |
956 | { | |
957 | struct sctp_transport *t; | |
958 | struct list_head *pos; | |
959 | struct list_head *temp; | |
960 | ||
961 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
962 | t = list_entry(pos, struct sctp_transport, transports); | |
5f242a13 | 963 | if (!sctp_cmp_addr_exact(&t->ipaddr, |
d808ad9a | 964 | &asoc->peer.primary_addr)) { |
38a03145 | 965 | sctp_assoc_del_peer(asoc, &t->ipaddr); |
1da177e4 LT |
966 | } |
967 | } | |
1da177e4 LT |
968 | } |
969 | ||
8de8c873 SS |
970 | /* Helper function to set sk_err on a 1-1 style socket. */ |
971 | static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error) | |
972 | { | |
973 | struct sock *sk = asoc->base.sk; | |
974 | ||
975 | if (!sctp_style(sk, UDP)) | |
976 | sk->sk_err = error; | |
977 | } | |
978 | ||
07d93967 VY |
979 | /* Helper function to generate an association change event */ |
980 | static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands, | |
981 | struct sctp_association *asoc, | |
982 | u8 state) | |
983 | { | |
984 | struct sctp_ulpevent *ev; | |
985 | ||
986 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0, | |
987 | asoc->c.sinit_num_ostreams, | |
988 | asoc->c.sinit_max_instreams, | |
989 | NULL, GFP_ATOMIC); | |
990 | if (ev) | |
991 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
992 | } | |
993 | ||
994 | /* Helper function to generate an adaptation indication event */ | |
995 | static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands, | |
996 | struct sctp_association *asoc) | |
997 | { | |
998 | struct sctp_ulpevent *ev; | |
999 | ||
1000 | ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); | |
1001 | ||
1002 | if (ev) | |
1003 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
1004 | } | |
1005 | ||
96cd0d3d VY |
1006 | |
1007 | static void sctp_cmd_t1_timer_update(struct sctp_association *asoc, | |
1008 | sctp_event_timeout_t timer, | |
1009 | char *name) | |
1010 | { | |
1011 | struct sctp_transport *t; | |
1012 | ||
1013 | t = asoc->init_last_sent_to; | |
1014 | asoc->init_err_counter++; | |
1015 | ||
1016 | if (t->init_sent_count > (asoc->init_cycle + 1)) { | |
1017 | asoc->timeouts[timer] *= 2; | |
1018 | if (asoc->timeouts[timer] > asoc->max_init_timeo) { | |
1019 | asoc->timeouts[timer] = asoc->max_init_timeo; | |
1020 | } | |
1021 | asoc->init_cycle++; | |
bb33381d DB |
1022 | |
1023 | pr_debug("%s: T1[%s] timeout adjustment init_err_counter:%d" | |
1024 | " cycle:%d timeout:%ld\n", __func__, name, | |
1025 | asoc->init_err_counter, asoc->init_cycle, | |
1026 | asoc->timeouts[timer]); | |
96cd0d3d VY |
1027 | } |
1028 | ||
1029 | } | |
1030 | ||
9c5c62be VY |
1031 | /* Send the whole message, chunk by chunk, to the outqueue. |
1032 | * This way the whole message is queued up and bundling if | |
1033 | * encouraged for small fragments. | |
1034 | */ | |
1035 | static int sctp_cmd_send_msg(struct sctp_association *asoc, | |
1036 | struct sctp_datamsg *msg) | |
1037 | { | |
1038 | struct sctp_chunk *chunk; | |
1039 | int error = 0; | |
1040 | ||
1041 | list_for_each_entry(chunk, &msg->chunks, frag_list) { | |
1042 | error = sctp_outq_tail(&asoc->outqueue, chunk); | |
1043 | if (error) | |
1044 | break; | |
1045 | } | |
1046 | ||
1047 | return error; | |
1048 | } | |
1049 | ||
1050 | ||
c0786693 VY |
1051 | /* Sent the next ASCONF packet currently stored in the association. |
1052 | * This happens after the ASCONF_ACK was succeffully processed. | |
1053 | */ | |
1054 | static void sctp_cmd_send_asconf(struct sctp_association *asoc) | |
1055 | { | |
55e26eb9 EB |
1056 | struct net *net = sock_net(asoc->base.sk); |
1057 | ||
c0786693 VY |
1058 | /* Send the next asconf chunk from the addip chunk |
1059 | * queue. | |
1060 | */ | |
1061 | if (!list_empty(&asoc->addip_chunk_list)) { | |
1062 | struct list_head *entry = asoc->addip_chunk_list.next; | |
1063 | struct sctp_chunk *asconf = list_entry(entry, | |
1064 | struct sctp_chunk, list); | |
1065 | list_del_init(entry); | |
1066 | ||
1067 | /* Hold the chunk until an ASCONF_ACK is received. */ | |
1068 | sctp_chunk_hold(asconf); | |
55e26eb9 | 1069 | if (sctp_primitive_ASCONF(net, asoc, asconf)) |
c0786693 VY |
1070 | sctp_chunk_free(asconf); |
1071 | else | |
1072 | asoc->addip_last_asconf = asconf; | |
1073 | } | |
1074 | } | |
1075 | ||
9c5c62be | 1076 | |
1da177e4 LT |
1077 | /* These three macros allow us to pull the debugging code out of the |
1078 | * main flow of sctp_do_sm() to keep attention focused on the real | |
1079 | * functionality there. | |
1080 | */ | |
bb33381d DB |
1081 | #define debug_pre_sfn() \ |
1082 | pr_debug("%s[pre-fn]: ep:%p, %s, %s, asoc:%p[%s], %s\n", __func__, \ | |
1083 | ep, sctp_evttype_tbl[event_type], (*debug_fn)(subtype), \ | |
1084 | asoc, sctp_state_tbl[state], state_fn->name) | |
1085 | ||
1086 | #define debug_post_sfn() \ | |
1087 | pr_debug("%s[post-fn]: asoc:%p, status:%s\n", __func__, asoc, \ | |
1088 | sctp_status_tbl[status]) | |
1089 | ||
1090 | #define debug_post_sfx() \ | |
1091 | pr_debug("%s[post-sfx]: error:%d, asoc:%p[%s]\n", __func__, error, \ | |
1092 | asoc, sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \ | |
1093 | sctp_assoc2id(asoc))) ? asoc->state : SCTP_STATE_CLOSED]) | |
1da177e4 LT |
1094 | |
1095 | /* | |
1096 | * This is the master state machine processing function. | |
1097 | * | |
1098 | * If you want to understand all of lksctp, this is a | |
1099 | * good place to start. | |
1100 | */ | |
55e26eb9 | 1101 | int sctp_do_sm(struct net *net, sctp_event_t event_type, sctp_subtype_t subtype, |
1da177e4 LT |
1102 | sctp_state_t state, |
1103 | struct sctp_endpoint *ep, | |
1104 | struct sctp_association *asoc, | |
1105 | void *event_arg, | |
dd0fc66f | 1106 | gfp_t gfp) |
1da177e4 LT |
1107 | { |
1108 | sctp_cmd_seq_t commands; | |
1109 | const sctp_sm_table_entry_t *state_fn; | |
1110 | sctp_disposition_t status; | |
1111 | int error = 0; | |
1112 | typedef const char *(printfn_t)(sctp_subtype_t); | |
1da177e4 LT |
1113 | static printfn_t *table[] = { |
1114 | NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname, | |
1115 | }; | |
1116 | printfn_t *debug_fn __attribute__ ((unused)) = table[event_type]; | |
1117 | ||
1118 | /* Look up the state function, run it, and then process the | |
1119 | * side effects. These three steps are the heart of lksctp. | |
1120 | */ | |
55e26eb9 | 1121 | state_fn = sctp_sm_lookup_event(net, event_type, state, subtype); |
1da177e4 LT |
1122 | |
1123 | sctp_init_cmd_seq(&commands); | |
1124 | ||
bb33381d | 1125 | debug_pre_sfn(); |
24cb81a6 | 1126 | status = (*state_fn->fn)(net, ep, asoc, subtype, event_arg, &commands); |
bb33381d | 1127 | debug_post_sfn(); |
1da177e4 LT |
1128 | |
1129 | error = sctp_side_effects(event_type, subtype, state, | |
d808ad9a | 1130 | ep, asoc, event_arg, status, |
1da177e4 | 1131 | &commands, gfp); |
bb33381d | 1132 | debug_post_sfx(); |
1da177e4 LT |
1133 | |
1134 | return error; | |
1135 | } | |
1136 | ||
1da177e4 LT |
1137 | /***************************************************************** |
1138 | * This the master state function side effect processing function. | |
1139 | *****************************************************************/ | |
1140 | static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, | |
1141 | sctp_state_t state, | |
1142 | struct sctp_endpoint *ep, | |
1143 | struct sctp_association *asoc, | |
1144 | void *event_arg, | |
1145 | sctp_disposition_t status, | |
1146 | sctp_cmd_seq_t *commands, | |
dd0fc66f | 1147 | gfp_t gfp) |
1da177e4 LT |
1148 | { |
1149 | int error; | |
1150 | ||
1151 | /* FIXME - Most of the dispositions left today would be categorized | |
1152 | * as "exceptional" dispositions. For those dispositions, it | |
1153 | * may not be proper to run through any of the commands at all. | |
1154 | * For example, the command interpreter might be run only with | |
1155 | * disposition SCTP_DISPOSITION_CONSUME. | |
1156 | */ | |
1157 | if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state, | |
1158 | ep, asoc, | |
1159 | event_arg, status, | |
1160 | commands, gfp))) | |
1161 | goto bail; | |
1162 | ||
1163 | switch (status) { | |
1164 | case SCTP_DISPOSITION_DISCARD: | |
bb33381d DB |
1165 | pr_debug("%s: ignored sctp protocol event - state:%d, " |
1166 | "event_type:%d, event_id:%d\n", __func__, state, | |
1167 | event_type, subtype.chunk); | |
1da177e4 LT |
1168 | break; |
1169 | ||
1170 | case SCTP_DISPOSITION_NOMEM: | |
1171 | /* We ran out of memory, so we need to discard this | |
1172 | * packet. | |
1173 | */ | |
1174 | /* BUG--we should now recover some memory, probably by | |
1175 | * reneging... | |
1176 | */ | |
1177 | error = -ENOMEM; | |
1178 | break; | |
1179 | ||
d808ad9a | 1180 | case SCTP_DISPOSITION_DELETE_TCB: |
1da177e4 LT |
1181 | /* This should now be a command. */ |
1182 | break; | |
1183 | ||
1184 | case SCTP_DISPOSITION_CONSUME: | |
1185 | case SCTP_DISPOSITION_ABORT: | |
1186 | /* | |
1187 | * We should no longer have much work to do here as the | |
1188 | * real work has been done as explicit commands above. | |
1189 | */ | |
1190 | break; | |
1191 | ||
1192 | case SCTP_DISPOSITION_VIOLATION: | |
e87cc472 JP |
1193 | net_err_ratelimited("protocol violation state %d chunkid %d\n", |
1194 | state, subtype.chunk); | |
1da177e4 LT |
1195 | break; |
1196 | ||
1197 | case SCTP_DISPOSITION_NOT_IMPL: | |
145ce502 JP |
1198 | pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n", |
1199 | state, event_type, subtype.chunk); | |
1da177e4 LT |
1200 | break; |
1201 | ||
1202 | case SCTP_DISPOSITION_BUG: | |
145ce502 | 1203 | pr_err("bug in state %d, event_type %d, event_id %d\n", |
1da177e4 LT |
1204 | state, event_type, subtype.chunk); |
1205 | BUG(); | |
1206 | break; | |
1207 | ||
1208 | default: | |
145ce502 | 1209 | pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n", |
1da177e4 LT |
1210 | status, state, event_type, subtype.chunk); |
1211 | BUG(); | |
1212 | break; | |
3ff50b79 | 1213 | } |
1da177e4 LT |
1214 | |
1215 | bail: | |
1216 | return error; | |
1217 | } | |
1218 | ||
1219 | /******************************************************************** | |
1220 | * 2nd Level Abstractions | |
1221 | ********************************************************************/ | |
1222 | ||
1223 | /* This is the side-effect interpreter. */ | |
1224 | static int sctp_cmd_interpreter(sctp_event_t event_type, | |
1225 | sctp_subtype_t subtype, | |
1226 | sctp_state_t state, | |
1227 | struct sctp_endpoint *ep, | |
1228 | struct sctp_association *asoc, | |
1229 | void *event_arg, | |
d808ad9a | 1230 | sctp_disposition_t status, |
1da177e4 | 1231 | sctp_cmd_seq_t *commands, |
dd0fc66f | 1232 | gfp_t gfp) |
1da177e4 LT |
1233 | { |
1234 | int error = 0; | |
1235 | int force; | |
1236 | sctp_cmd_t *cmd; | |
1237 | struct sctp_chunk *new_obj; | |
1238 | struct sctp_chunk *chunk = NULL; | |
1239 | struct sctp_packet *packet; | |
1da177e4 LT |
1240 | struct timer_list *timer; |
1241 | unsigned long timeout; | |
1242 | struct sctp_transport *t; | |
1243 | struct sctp_sackhdr sackh; | |
1244 | int local_cork = 0; | |
1245 | ||
1246 | if (SCTP_EVENT_T_TIMEOUT != event_type) | |
ea110733 | 1247 | chunk = event_arg; |
1da177e4 LT |
1248 | |
1249 | /* Note: This whole file is a huge candidate for rework. | |
1250 | * For example, each command could either have its own handler, so | |
1251 | * the loop would look like: | |
1252 | * while (cmds) | |
1253 | * cmd->handle(x, y, z) | |
1254 | * --jgrimm | |
1255 | */ | |
1256 | while (NULL != (cmd = sctp_next_cmd(commands))) { | |
1257 | switch (cmd->verb) { | |
1258 | case SCTP_CMD_NOP: | |
1259 | /* Do nothing. */ | |
1260 | break; | |
1261 | ||
1262 | case SCTP_CMD_NEW_ASOC: | |
1263 | /* Register a new association. */ | |
1264 | if (local_cork) { | |
d808ad9a | 1265 | sctp_outq_uncork(&asoc->outqueue); |
1da177e4 LT |
1266 | local_cork = 0; |
1267 | } | |
f9e42b85 | 1268 | |
1da177e4 | 1269 | /* Register with the endpoint. */ |
f9e42b85 DB |
1270 | asoc = cmd->obj.asoc; |
1271 | BUG_ON(asoc->peer.primary_path == NULL); | |
1da177e4 LT |
1272 | sctp_endpoint_add_asoc(ep, asoc); |
1273 | sctp_hash_established(asoc); | |
1274 | break; | |
1275 | ||
1276 | case SCTP_CMD_UPDATE_ASSOC: | |
b26ddd81 | 1277 | sctp_assoc_update(asoc, cmd->obj.asoc); |
1da177e4 LT |
1278 | break; |
1279 | ||
1280 | case SCTP_CMD_PURGE_OUTQUEUE: | |
1281 | sctp_outq_teardown(&asoc->outqueue); | |
1282 | break; | |
1283 | ||
d808ad9a | 1284 | case SCTP_CMD_DELETE_TCB: |
1da177e4 LT |
1285 | if (local_cork) { |
1286 | sctp_outq_uncork(&asoc->outqueue); | |
1287 | local_cork = 0; | |
1288 | } | |
1289 | /* Delete the current association. */ | |
1290 | sctp_cmd_delete_tcb(commands, asoc); | |
1291 | asoc = NULL; | |
1292 | break; | |
1293 | ||
1294 | case SCTP_CMD_NEW_STATE: | |
1295 | /* Enter a new state. */ | |
1296 | sctp_cmd_new_state(commands, asoc, cmd->obj.state); | |
1297 | break; | |
1298 | ||
1299 | case SCTP_CMD_REPORT_TSN: | |
1300 | /* Record the arrival of a TSN. */ | |
8e1ee18c | 1301 | error = sctp_tsnmap_mark(&asoc->peer.tsn_map, |
4244854d | 1302 | cmd->obj.u32, NULL); |
1da177e4 LT |
1303 | break; |
1304 | ||
1305 | case SCTP_CMD_REPORT_FWDTSN: | |
1306 | /* Move the Cumulattive TSN Ack ahead. */ | |
1307 | sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32); | |
1308 | ||
ea2dfb37 VY |
1309 | /* purge the fragmentation queue */ |
1310 | sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32); | |
1311 | ||
1da177e4 LT |
1312 | /* Abort any in progress partial delivery. */ |
1313 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); | |
1314 | break; | |
1315 | ||
1316 | case SCTP_CMD_PROCESS_FWDTSN: | |
b26ddd81 | 1317 | sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.chunk); |
d808ad9a | 1318 | break; |
1da177e4 LT |
1319 | |
1320 | case SCTP_CMD_GEN_SACK: | |
1321 | /* Generate a Selective ACK. | |
1322 | * The argument tells us whether to just count | |
1323 | * the packet and MAYBE generate a SACK, or | |
1324 | * force a SACK out. | |
1325 | */ | |
1326 | force = cmd->obj.i32; | |
1327 | error = sctp_gen_sack(asoc, force, commands); | |
1328 | break; | |
1329 | ||
1330 | case SCTP_CMD_PROCESS_SACK: | |
1331 | /* Process an inbound SACK. */ | |
1332 | error = sctp_cmd_process_sack(commands, asoc, | |
b26ddd81 | 1333 | cmd->obj.chunk); |
1da177e4 LT |
1334 | break; |
1335 | ||
1336 | case SCTP_CMD_GEN_INIT_ACK: | |
1337 | /* Generate an INIT ACK chunk. */ | |
1338 | new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC, | |
1339 | 0); | |
1340 | if (!new_obj) | |
1341 | goto nomem; | |
1342 | ||
1343 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1344 | SCTP_CHUNK(new_obj)); | |
1345 | break; | |
1346 | ||
1347 | case SCTP_CMD_PEER_INIT: | |
1348 | /* Process a unified INIT from the peer. | |
1349 | * Note: Only used during INIT-ACK processing. If | |
1350 | * there is an error just return to the outter | |
1351 | * layer which will bail. | |
1352 | */ | |
1353 | error = sctp_cmd_process_init(commands, asoc, chunk, | |
b26ddd81 | 1354 | cmd->obj.init, gfp); |
1da177e4 LT |
1355 | break; |
1356 | ||
1357 | case SCTP_CMD_GEN_COOKIE_ECHO: | |
1358 | /* Generate a COOKIE ECHO chunk. */ | |
1359 | new_obj = sctp_make_cookie_echo(asoc, chunk); | |
1360 | if (!new_obj) { | |
b26ddd81 NH |
1361 | if (cmd->obj.chunk) |
1362 | sctp_chunk_free(cmd->obj.chunk); | |
1da177e4 LT |
1363 | goto nomem; |
1364 | } | |
1365 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1366 | SCTP_CHUNK(new_obj)); | |
1367 | ||
1368 | /* If there is an ERROR chunk to be sent along with | |
1369 | * the COOKIE_ECHO, send it, too. | |
1370 | */ | |
b26ddd81 | 1371 | if (cmd->obj.chunk) |
1da177e4 | 1372 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
b26ddd81 | 1373 | SCTP_CHUNK(cmd->obj.chunk)); |
1da177e4 | 1374 | |
96cd0d3d VY |
1375 | if (new_obj->transport) { |
1376 | new_obj->transport->init_sent_count++; | |
1377 | asoc->init_last_sent_to = new_obj->transport; | |
1378 | } | |
1379 | ||
1da177e4 | 1380 | /* FIXME - Eventually come up with a cleaner way to |
d808ad9a YH |
1381 | * enabling COOKIE-ECHO + DATA bundling during |
1382 | * multihoming stale cookie scenarios, the following | |
1383 | * command plays with asoc->peer.retran_path to | |
1384 | * avoid the problem of sending the COOKIE-ECHO and | |
1385 | * DATA in different paths, which could result | |
1386 | * in the association being ABORTed if the DATA chunk | |
1da177e4 LT |
1387 | * is processed first by the server. Checking the |
1388 | * init error counter simply causes this command | |
1389 | * to be executed only during failed attempts of | |
1390 | * association establishment. | |
1391 | */ | |
3f7a87d2 FF |
1392 | if ((asoc->peer.retran_path != |
1393 | asoc->peer.primary_path) && | |
1394 | (asoc->init_err_counter > 0)) { | |
1395 | sctp_add_cmd_sf(commands, | |
d808ad9a | 1396 | SCTP_CMD_FORCE_PRIM_RETRAN, |
1da177e4 LT |
1397 | SCTP_NULL()); |
1398 | } | |
1399 | ||
1400 | break; | |
1401 | ||
1402 | case SCTP_CMD_GEN_SHUTDOWN: | |
1403 | /* Generate SHUTDOWN when in SHUTDOWN_SENT state. | |
1404 | * Reset error counts. | |
1405 | */ | |
1406 | asoc->overall_error_count = 0; | |
1407 | ||
1408 | /* Generate a SHUTDOWN chunk. */ | |
1409 | new_obj = sctp_make_shutdown(asoc, chunk); | |
1410 | if (!new_obj) | |
1411 | goto nomem; | |
1412 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1413 | SCTP_CHUNK(new_obj)); | |
1414 | break; | |
1415 | ||
1416 | case SCTP_CMD_CHUNK_ULP: | |
1417 | /* Send a chunk to the sockets layer. */ | |
bb33381d DB |
1418 | pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n", |
1419 | __func__, cmd->obj.chunk, &asoc->ulpq); | |
1420 | ||
b26ddd81 | 1421 | sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.chunk, |
1da177e4 LT |
1422 | GFP_ATOMIC); |
1423 | break; | |
1424 | ||
1425 | case SCTP_CMD_EVENT_ULP: | |
1426 | /* Send a notification to the sockets layer. */ | |
bb33381d DB |
1427 | pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n", |
1428 | __func__, cmd->obj.ulpevent, &asoc->ulpq); | |
1429 | ||
b26ddd81 | 1430 | sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ulpevent); |
1da177e4 LT |
1431 | break; |
1432 | ||
1433 | case SCTP_CMD_REPLY: | |
1434 | /* If an caller has not already corked, do cork. */ | |
1435 | if (!asoc->outqueue.cork) { | |
1436 | sctp_outq_cork(&asoc->outqueue); | |
1437 | local_cork = 1; | |
1438 | } | |
1439 | /* Send a chunk to our peer. */ | |
b26ddd81 | 1440 | error = sctp_outq_tail(&asoc->outqueue, cmd->obj.chunk); |
1da177e4 LT |
1441 | break; |
1442 | ||
1443 | case SCTP_CMD_SEND_PKT: | |
1444 | /* Send a full packet to our peer. */ | |
b26ddd81 | 1445 | packet = cmd->obj.packet; |
1da177e4 LT |
1446 | sctp_packet_transmit(packet); |
1447 | sctp_ootb_pkt_free(packet); | |
1448 | break; | |
1449 | ||
b6157d8e VY |
1450 | case SCTP_CMD_T1_RETRAN: |
1451 | /* Mark a transport for retransmission. */ | |
1452 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1453 | SCTP_RTXR_T1_RTX); | |
1454 | break; | |
1455 | ||
1da177e4 LT |
1456 | case SCTP_CMD_RETRAN: |
1457 | /* Mark a transport for retransmission. */ | |
1458 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1459 | SCTP_RTXR_T3_RTX); | |
1460 | break; | |
1461 | ||
1da177e4 LT |
1462 | case SCTP_CMD_ECN_CE: |
1463 | /* Do delayed CE processing. */ | |
1464 | sctp_do_ecn_ce_work(asoc, cmd->obj.u32); | |
1465 | break; | |
1466 | ||
1467 | case SCTP_CMD_ECN_ECNE: | |
1468 | /* Do delayed ECNE processing. */ | |
1469 | new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32, | |
1470 | chunk); | |
1471 | if (new_obj) | |
1472 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1473 | SCTP_CHUNK(new_obj)); | |
1474 | break; | |
1475 | ||
1476 | case SCTP_CMD_ECN_CWR: | |
1477 | /* Do delayed CWR processing. */ | |
1478 | sctp_do_ecn_cwr_work(asoc, cmd->obj.u32); | |
1479 | break; | |
1480 | ||
1481 | case SCTP_CMD_SETUP_T2: | |
b26ddd81 | 1482 | sctp_cmd_setup_t2(commands, asoc, cmd->obj.chunk); |
1da177e4 LT |
1483 | break; |
1484 | ||
f8d96052 TG |
1485 | case SCTP_CMD_TIMER_START_ONCE: |
1486 | timer = &asoc->timers[cmd->obj.to]; | |
1487 | ||
1488 | if (timer_pending(timer)) | |
1489 | break; | |
1490 | /* fall through */ | |
1491 | ||
1da177e4 LT |
1492 | case SCTP_CMD_TIMER_START: |
1493 | timer = &asoc->timers[cmd->obj.to]; | |
1494 | timeout = asoc->timeouts[cmd->obj.to]; | |
09a62660 | 1495 | BUG_ON(!timeout); |
1da177e4 LT |
1496 | |
1497 | timer->expires = jiffies + timeout; | |
1498 | sctp_association_hold(asoc); | |
1499 | add_timer(timer); | |
1500 | break; | |
1501 | ||
1502 | case SCTP_CMD_TIMER_RESTART: | |
1503 | timer = &asoc->timers[cmd->obj.to]; | |
1504 | timeout = asoc->timeouts[cmd->obj.to]; | |
1505 | if (!mod_timer(timer, jiffies + timeout)) | |
1506 | sctp_association_hold(asoc); | |
1507 | break; | |
1508 | ||
1509 | case SCTP_CMD_TIMER_STOP: | |
1510 | timer = &asoc->timers[cmd->obj.to]; | |
25cc4ae9 | 1511 | if (del_timer(timer)) |
1da177e4 LT |
1512 | sctp_association_put(asoc); |
1513 | break; | |
1514 | ||
3f7a87d2 | 1515 | case SCTP_CMD_INIT_CHOOSE_TRANSPORT: |
b26ddd81 | 1516 | chunk = cmd->obj.chunk; |
9919b455 WY |
1517 | t = sctp_assoc_choose_alter_transport(asoc, |
1518 | asoc->init_last_sent_to); | |
3f7a87d2 FF |
1519 | asoc->init_last_sent_to = t; |
1520 | chunk->transport = t; | |
1521 | t->init_sent_count++; | |
e0e9db17 VY |
1522 | /* Set the new transport as primary */ |
1523 | sctp_assoc_set_primary(asoc, t); | |
3f7a87d2 FF |
1524 | break; |
1525 | ||
1da177e4 LT |
1526 | case SCTP_CMD_INIT_RESTART: |
1527 | /* Do the needed accounting and updates | |
1528 | * associated with restarting an initialization | |
3f7a87d2 FF |
1529 | * timer. Only multiply the timeout by two if |
1530 | * all transports have been tried at the current | |
1531 | * timeout. | |
1532 | */ | |
96cd0d3d VY |
1533 | sctp_cmd_t1_timer_update(asoc, |
1534 | SCTP_EVENT_TIMEOUT_T1_INIT, | |
1535 | "INIT"); | |
3f7a87d2 FF |
1536 | |
1537 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
1538 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
1539 | break; | |
1540 | ||
1541 | case SCTP_CMD_COOKIEECHO_RESTART: | |
1542 | /* Do the needed accounting and updates | |
1543 | * associated with restarting an initialization | |
1544 | * timer. Only multiply the timeout by two if | |
1545 | * all transports have been tried at the current | |
1546 | * timeout. | |
1da177e4 | 1547 | */ |
96cd0d3d VY |
1548 | sctp_cmd_t1_timer_update(asoc, |
1549 | SCTP_EVENT_TIMEOUT_T1_COOKIE, | |
1550 | "COOKIE"); | |
1da177e4 LT |
1551 | |
1552 | /* If we've sent any data bundled with | |
1553 | * COOKIE-ECHO we need to resend. | |
1554 | */ | |
9dbc15f0 RD |
1555 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1556 | transports) { | |
b6157d8e VY |
1557 | sctp_retransmit_mark(&asoc->outqueue, t, |
1558 | SCTP_RTXR_T1_RTX); | |
1da177e4 LT |
1559 | } |
1560 | ||
1561 | sctp_add_cmd_sf(commands, | |
1562 | SCTP_CMD_TIMER_RESTART, | |
3f7a87d2 | 1563 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); |
1da177e4 LT |
1564 | break; |
1565 | ||
1566 | case SCTP_CMD_INIT_FAILED: | |
dc251b2b | 1567 | sctp_cmd_init_failed(commands, asoc, cmd->obj.err); |
1da177e4 LT |
1568 | break; |
1569 | ||
1570 | case SCTP_CMD_ASSOC_FAILED: | |
1571 | sctp_cmd_assoc_failed(commands, asoc, event_type, | |
5be291fe | 1572 | subtype, chunk, cmd->obj.err); |
1da177e4 LT |
1573 | break; |
1574 | ||
3f7a87d2 FF |
1575 | case SCTP_CMD_INIT_COUNTER_INC: |
1576 | asoc->init_err_counter++; | |
1da177e4 LT |
1577 | break; |
1578 | ||
3f7a87d2 FF |
1579 | case SCTP_CMD_INIT_COUNTER_RESET: |
1580 | asoc->init_err_counter = 0; | |
1581 | asoc->init_cycle = 0; | |
96cd0d3d VY |
1582 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1583 | transports) { | |
1584 | t->init_sent_count = 0; | |
1585 | } | |
1da177e4 LT |
1586 | break; |
1587 | ||
1588 | case SCTP_CMD_REPORT_DUP: | |
1589 | sctp_tsnmap_mark_dup(&asoc->peer.tsn_map, | |
1590 | cmd->obj.u32); | |
1591 | break; | |
1592 | ||
1593 | case SCTP_CMD_REPORT_BAD_TAG: | |
bb33381d | 1594 | pr_debug("%s: vtag mismatch!\n", __func__); |
1da177e4 LT |
1595 | break; |
1596 | ||
1597 | case SCTP_CMD_STRIKE: | |
1598 | /* Mark one strike against a transport. */ | |
5aa93bcf NH |
1599 | sctp_do_8_2_transport_strike(commands, asoc, |
1600 | cmd->obj.transport, 0); | |
7e99013a VY |
1601 | break; |
1602 | ||
1603 | case SCTP_CMD_TRANSPORT_IDLE: | |
1604 | t = cmd->obj.transport; | |
1605 | sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE); | |
1da177e4 LT |
1606 | break; |
1607 | ||
7e99013a | 1608 | case SCTP_CMD_TRANSPORT_HB_SENT: |
1da177e4 | 1609 | t = cmd->obj.transport; |
5aa93bcf NH |
1610 | sctp_do_8_2_transport_strike(commands, asoc, |
1611 | t, 1); | |
7e99013a | 1612 | t->hb_sent = 1; |
1da177e4 LT |
1613 | break; |
1614 | ||
1615 | case SCTP_CMD_TRANSPORT_ON: | |
1616 | t = cmd->obj.transport; | |
1617 | sctp_cmd_transport_on(commands, asoc, t, chunk); | |
1618 | break; | |
1619 | ||
1620 | case SCTP_CMD_HB_TIMERS_START: | |
1621 | sctp_cmd_hb_timers_start(commands, asoc); | |
1622 | break; | |
1623 | ||
1624 | case SCTP_CMD_HB_TIMER_UPDATE: | |
1625 | t = cmd->obj.transport; | |
765ff02e | 1626 | sctp_cmd_hb_timer_update(commands, t); |
1da177e4 LT |
1627 | break; |
1628 | ||
1629 | case SCTP_CMD_HB_TIMERS_STOP: | |
1630 | sctp_cmd_hb_timers_stop(commands, asoc); | |
1631 | break; | |
1632 | ||
1633 | case SCTP_CMD_REPORT_ERROR: | |
1634 | error = cmd->obj.error; | |
1635 | break; | |
1636 | ||
1637 | case SCTP_CMD_PROCESS_CTSN: | |
1638 | /* Dummy up a SACK for processing. */ | |
2178eda8 | 1639 | sackh.cum_tsn_ack = cmd->obj.be32; |
d4d6fb57 VY |
1640 | sackh.a_rwnd = asoc->peer.rwnd + |
1641 | asoc->outqueue.outstanding_bytes; | |
1da177e4 LT |
1642 | sackh.num_gap_ack_blocks = 0; |
1643 | sackh.num_dup_tsns = 0; | |
f6e80abe | 1644 | chunk->subh.sack_hdr = &sackh; |
1da177e4 | 1645 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, |
f6e80abe | 1646 | SCTP_CHUNK(chunk)); |
1da177e4 LT |
1647 | break; |
1648 | ||
1649 | case SCTP_CMD_DISCARD_PACKET: | |
2e3216cd VY |
1650 | /* We need to discard the whole packet. |
1651 | * Uncork the queue since there might be | |
1652 | * responses pending | |
1653 | */ | |
1da177e4 | 1654 | chunk->pdiscard = 1; |
2e3216cd VY |
1655 | if (asoc) { |
1656 | sctp_outq_uncork(&asoc->outqueue); | |
1657 | local_cork = 0; | |
1658 | } | |
1da177e4 LT |
1659 | break; |
1660 | ||
1661 | case SCTP_CMD_RTO_PENDING: | |
1662 | t = cmd->obj.transport; | |
1663 | t->rto_pending = 1; | |
1664 | break; | |
1665 | ||
1666 | case SCTP_CMD_PART_DELIVER: | |
b26ddd81 | 1667 | sctp_ulpq_partial_delivery(&asoc->ulpq, GFP_ATOMIC); |
1da177e4 LT |
1668 | break; |
1669 | ||
1670 | case SCTP_CMD_RENEGE: | |
b26ddd81 | 1671 | sctp_ulpq_renege(&asoc->ulpq, cmd->obj.chunk, |
1da177e4 LT |
1672 | GFP_ATOMIC); |
1673 | break; | |
1674 | ||
1675 | case SCTP_CMD_SETUP_T4: | |
b26ddd81 | 1676 | sctp_cmd_setup_t4(commands, asoc, cmd->obj.chunk); |
1da177e4 LT |
1677 | break; |
1678 | ||
1679 | case SCTP_CMD_PROCESS_OPERR: | |
1680 | sctp_cmd_process_operr(commands, asoc, chunk); | |
1681 | break; | |
1682 | case SCTP_CMD_CLEAR_INIT_TAG: | |
1683 | asoc->peer.i.init_tag = 0; | |
1684 | break; | |
1685 | case SCTP_CMD_DEL_NON_PRIMARY: | |
1686 | sctp_cmd_del_non_primary(asoc); | |
1687 | break; | |
1688 | case SCTP_CMD_T3_RTX_TIMERS_STOP: | |
1689 | sctp_cmd_t3_rtx_timers_stop(commands, asoc); | |
1690 | break; | |
1691 | case SCTP_CMD_FORCE_PRIM_RETRAN: | |
1692 | t = asoc->peer.retran_path; | |
1693 | asoc->peer.retran_path = asoc->peer.primary_path; | |
1694 | error = sctp_outq_uncork(&asoc->outqueue); | |
1695 | local_cork = 0; | |
1696 | asoc->peer.retran_path = t; | |
1697 | break; | |
8de8c873 SS |
1698 | case SCTP_CMD_SET_SK_ERR: |
1699 | sctp_cmd_set_sk_err(asoc, cmd->obj.error); | |
1700 | break; | |
07d93967 VY |
1701 | case SCTP_CMD_ASSOC_CHANGE: |
1702 | sctp_cmd_assoc_change(commands, asoc, | |
1703 | cmd->obj.u8); | |
1704 | break; | |
1705 | case SCTP_CMD_ADAPTATION_IND: | |
1706 | sctp_cmd_adaptation_ind(commands, asoc); | |
1707 | break; | |
1708 | ||
730fc3d0 VY |
1709 | case SCTP_CMD_ASSOC_SHKEY: |
1710 | error = sctp_auth_asoc_init_active_key(asoc, | |
1711 | GFP_ATOMIC); | |
1712 | break; | |
f4ad85ca GJ |
1713 | case SCTP_CMD_UPDATE_INITTAG: |
1714 | asoc->peer.i.init_tag = cmd->obj.u32; | |
1715 | break; | |
9c5c62be VY |
1716 | case SCTP_CMD_SEND_MSG: |
1717 | if (!asoc->outqueue.cork) { | |
1718 | sctp_outq_cork(&asoc->outqueue); | |
1719 | local_cork = 1; | |
1720 | } | |
1721 | error = sctp_cmd_send_msg(asoc, cmd->obj.msg); | |
1722 | break; | |
c0786693 VY |
1723 | case SCTP_CMD_SEND_NEXT_ASCONF: |
1724 | sctp_cmd_send_asconf(asoc); | |
1725 | break; | |
a000c01e WY |
1726 | case SCTP_CMD_PURGE_ASCONF_QUEUE: |
1727 | sctp_asconf_queue_teardown(asoc); | |
1728 | break; | |
d5ccd496 MM |
1729 | |
1730 | case SCTP_CMD_SET_ASOC: | |
1731 | asoc = cmd->obj.asoc; | |
1732 | break; | |
1733 | ||
1da177e4 | 1734 | default: |
b26ddd81 NH |
1735 | pr_warn("Impossible command: %u\n", |
1736 | cmd->verb); | |
1da177e4 | 1737 | break; |
3ff50b79 SH |
1738 | } |
1739 | ||
1da177e4 LT |
1740 | if (error) |
1741 | break; | |
1742 | } | |
1743 | ||
1744 | out: | |
2e3216cd VY |
1745 | /* If this is in response to a received chunk, wait until |
1746 | * we are done with the packet to open the queue so that we don't | |
1747 | * send multiple packets in response to a single request. | |
1748 | */ | |
1749 | if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) { | |
1750 | if (chunk->end_of_packet || chunk->singleton) | |
d4d6fb57 | 1751 | error = sctp_outq_uncork(&asoc->outqueue); |
2e3216cd | 1752 | } else if (local_cork) |
d4d6fb57 | 1753 | error = sctp_outq_uncork(&asoc->outqueue); |
1da177e4 LT |
1754 | return error; |
1755 | nomem: | |
1756 | error = -ENOMEM; | |
1757 | goto out; | |
1758 | } | |
1759 |