Commit | Line | Data |
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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * (C) Copyright IBM Corp. 2001, 2004 |
3 | * Copyright (c) 1999 Cisco, Inc. | |
4 | * Copyright (c) 1999-2001 Motorola, Inc. | |
5 | * | |
60c778b2 | 6 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
7 | * |
8 | * These functions work with the state functions in sctp_sm_statefuns.c | |
9 | * to implement that state operations. These functions implement the | |
10 | * steps which require modifying existing data structures. | |
11 | * | |
60c778b2 | 12 | * This SCTP implementation is free software; |
1da177e4 LT |
13 | * you can redistribute it and/or modify it under the terms of |
14 | * the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2, or (at your option) | |
16 | * any later version. | |
17 | * | |
60c778b2 | 18 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
19 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
20 | * ************************ | |
21 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
22 | * See the GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
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)) { | |
0dc47877 | 260 | SCTP_DEBUG_PRINTK("%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)) { | |
300 | SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n", | |
0dc47877 | 301 | __func__, |
1da177e4 LT |
302 | timeout_type); |
303 | ||
304 | /* Try again later. */ | |
305 | if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20))) | |
306 | sctp_association_hold(asoc); | |
307 | goto out_unlock; | |
308 | } | |
309 | ||
310 | /* Is this association really dead and just waiting around for | |
311 | * the timer to let go of the reference? | |
312 | */ | |
313 | if (asoc->base.dead) | |
314 | goto out_unlock; | |
315 | ||
316 | /* Run through the state machine. */ | |
55e26eb9 | 317 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
318 | SCTP_ST_TIMEOUT(timeout_type), |
319 | asoc->state, asoc->ep, asoc, | |
320 | (void *)timeout_type, GFP_ATOMIC); | |
321 | ||
322 | if (error) | |
323 | asoc->base.sk->sk_err = -error; | |
324 | ||
325 | out_unlock: | |
326 | sctp_bh_unlock_sock(asoc->base.sk); | |
327 | sctp_association_put(asoc); | |
328 | } | |
329 | ||
330 | static void sctp_generate_t1_cookie_event(unsigned long data) | |
331 | { | |
332 | struct sctp_association *asoc = (struct sctp_association *) data; | |
333 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE); | |
334 | } | |
335 | ||
336 | static void sctp_generate_t1_init_event(unsigned long data) | |
337 | { | |
338 | struct sctp_association *asoc = (struct sctp_association *) data; | |
339 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT); | |
340 | } | |
341 | ||
342 | static void sctp_generate_t2_shutdown_event(unsigned long data) | |
343 | { | |
344 | struct sctp_association *asoc = (struct sctp_association *) data; | |
345 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN); | |
346 | } | |
347 | ||
348 | static void sctp_generate_t4_rto_event(unsigned long data) | |
349 | { | |
350 | struct sctp_association *asoc = (struct sctp_association *) data; | |
351 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO); | |
352 | } | |
353 | ||
354 | static void sctp_generate_t5_shutdown_guard_event(unsigned long data) | |
355 | { | |
d808ad9a YH |
356 | struct sctp_association *asoc = (struct sctp_association *)data; |
357 | sctp_generate_timeout_event(asoc, | |
1da177e4 LT |
358 | SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD); |
359 | ||
360 | } /* sctp_generate_t5_shutdown_guard_event() */ | |
361 | ||
362 | static void sctp_generate_autoclose_event(unsigned long data) | |
363 | { | |
364 | struct sctp_association *asoc = (struct sctp_association *) data; | |
365 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE); | |
366 | } | |
367 | ||
368 | /* Generate a heart beat event. If the sock is busy, reschedule. Make | |
369 | * sure that the transport is still valid. | |
370 | */ | |
371 | void sctp_generate_heartbeat_event(unsigned long data) | |
372 | { | |
373 | int error = 0; | |
374 | struct sctp_transport *transport = (struct sctp_transport *) data; | |
375 | struct sctp_association *asoc = transport->asoc; | |
55e26eb9 | 376 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
377 | |
378 | sctp_bh_lock_sock(asoc->base.sk); | |
379 | if (sock_owned_by_user(asoc->base.sk)) { | |
0dc47877 | 380 | SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__); |
1da177e4 LT |
381 | |
382 | /* Try again later. */ | |
383 | if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20))) | |
384 | sctp_transport_hold(transport); | |
385 | goto out_unlock; | |
386 | } | |
387 | ||
388 | /* Is this structure just waiting around for us to actually | |
389 | * get destroyed? | |
390 | */ | |
391 | if (transport->dead) | |
392 | goto out_unlock; | |
393 | ||
55e26eb9 | 394 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
395 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT), |
396 | asoc->state, asoc->ep, asoc, | |
397 | transport, GFP_ATOMIC); | |
398 | ||
d808ad9a | 399 | if (error) |
1da177e4 LT |
400 | asoc->base.sk->sk_err = -error; |
401 | ||
402 | out_unlock: | |
403 | sctp_bh_unlock_sock(asoc->base.sk); | |
404 | sctp_transport_put(transport); | |
405 | } | |
406 | ||
50b5d6ad VY |
407 | /* Handle the timeout of the ICMP protocol unreachable timer. Trigger |
408 | * the correct state machine transition that will close the association. | |
409 | */ | |
410 | void sctp_generate_proto_unreach_event(unsigned long data) | |
411 | { | |
412 | struct sctp_transport *transport = (struct sctp_transport *) data; | |
413 | struct sctp_association *asoc = transport->asoc; | |
55e26eb9 | 414 | struct net *net = sock_net(asoc->base.sk); |
50b5d6ad VY |
415 | |
416 | sctp_bh_lock_sock(asoc->base.sk); | |
417 | if (sock_owned_by_user(asoc->base.sk)) { | |
418 | SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__); | |
419 | ||
420 | /* Try again later. */ | |
421 | if (!mod_timer(&transport->proto_unreach_timer, | |
422 | jiffies + (HZ/20))) | |
423 | sctp_association_hold(asoc); | |
424 | goto out_unlock; | |
425 | } | |
426 | ||
427 | /* Is this structure just waiting around for us to actually | |
428 | * get destroyed? | |
429 | */ | |
430 | if (asoc->base.dead) | |
431 | goto out_unlock; | |
432 | ||
55e26eb9 | 433 | sctp_do_sm(net, SCTP_EVENT_T_OTHER, |
50b5d6ad VY |
434 | SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH), |
435 | asoc->state, asoc->ep, asoc, transport, GFP_ATOMIC); | |
436 | ||
437 | out_unlock: | |
438 | sctp_bh_unlock_sock(asoc->base.sk); | |
439 | sctp_association_put(asoc); | |
440 | } | |
441 | ||
442 | ||
1da177e4 LT |
443 | /* Inject a SACK Timeout event into the state machine. */ |
444 | static void sctp_generate_sack_event(unsigned long data) | |
445 | { | |
446 | struct sctp_association *asoc = (struct sctp_association *) data; | |
447 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK); | |
448 | } | |
449 | ||
450 | sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = { | |
451 | NULL, | |
452 | sctp_generate_t1_cookie_event, | |
453 | sctp_generate_t1_init_event, | |
454 | sctp_generate_t2_shutdown_event, | |
455 | NULL, | |
456 | sctp_generate_t4_rto_event, | |
457 | sctp_generate_t5_shutdown_guard_event, | |
1e7d3d90 | 458 | NULL, |
1da177e4 LT |
459 | sctp_generate_sack_event, |
460 | sctp_generate_autoclose_event, | |
461 | }; | |
462 | ||
463 | ||
464 | /* RFC 2960 8.2 Path Failure Detection | |
465 | * | |
466 | * When its peer endpoint is multi-homed, an endpoint should keep a | |
467 | * error counter for each of the destination transport addresses of the | |
468 | * peer endpoint. | |
469 | * | |
470 | * Each time the T3-rtx timer expires on any address, or when a | |
471 | * HEARTBEAT sent to an idle address is not acknowledged within a RTO, | |
472 | * the error counter of that destination address will be incremented. | |
473 | * When the value in the error counter exceeds the protocol parameter | |
474 | * 'Path.Max.Retrans' of that destination address, the endpoint should | |
475 | * mark the destination transport address as inactive, and a | |
476 | * notification SHOULD be sent to the upper layer. | |
477 | * | |
478 | */ | |
5aa93bcf NH |
479 | static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t *commands, |
480 | struct sctp_association *asoc, | |
7e99013a VY |
481 | struct sctp_transport *transport, |
482 | int is_hb) | |
1da177e4 LT |
483 | { |
484 | /* The check for association's overall error counter exceeding the | |
485 | * threshold is done in the state function. | |
486 | */ | |
b9f84786 VY |
487 | /* We are here due to a timer expiration. If the timer was |
488 | * not a HEARTBEAT, then normal error tracking is done. | |
489 | * If the timer was a heartbeat, we only increment error counts | |
490 | * when we already have an outstanding HEARTBEAT that has not | |
491 | * been acknowledged. | |
25985edc | 492 | * Additionally, some tranport states inhibit error increments. |
ad8fec17 | 493 | */ |
b9f84786 | 494 | if (!is_hb) { |
ad8fec17 | 495 | asoc->overall_error_count++; |
b9f84786 VY |
496 | if (transport->state != SCTP_INACTIVE) |
497 | transport->error_count++; | |
498 | } else if (transport->hb_sent) { | |
499 | if (transport->state != SCTP_UNCONFIRMED) | |
500 | asoc->overall_error_count++; | |
501 | if (transport->state != SCTP_INACTIVE) | |
502 | transport->error_count++; | |
503 | } | |
1da177e4 | 504 | |
5aa93bcf NH |
505 | /* If the transport error count is greater than the pf_retrans |
506 | * threshold, and less than pathmaxrtx, then mark this transport | |
507 | * as Partially Failed, ee SCTP Quick Failover Draft, secon 5.1, | |
508 | * point 1 | |
509 | */ | |
510 | if ((transport->state != SCTP_PF) && | |
511 | (asoc->pf_retrans < transport->pathmaxrxt) && | |
512 | (transport->error_count > asoc->pf_retrans)) { | |
513 | ||
514 | sctp_assoc_control_transport(asoc, transport, | |
515 | SCTP_TRANSPORT_PF, | |
516 | 0); | |
517 | ||
518 | /* Update the hb timer to resend a heartbeat every rto */ | |
519 | sctp_cmd_hb_timer_update(commands, transport); | |
520 | } | |
521 | ||
3f7a87d2 | 522 | if (transport->state != SCTP_INACTIVE && |
b9f84786 | 523 | (transport->error_count > transport->pathmaxrxt)) { |
3f7a87d2 FF |
524 | SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p", |
525 | " transport IP: port:%d failed.\n", | |
526 | asoc, | |
b3f5b3b6 AV |
527 | (&transport->ipaddr), |
528 | ntohs(transport->ipaddr.v4.sin_port)); | |
1da177e4 LT |
529 | sctp_assoc_control_transport(asoc, transport, |
530 | SCTP_TRANSPORT_DOWN, | |
531 | SCTP_FAILED_THRESHOLD); | |
532 | } | |
533 | ||
534 | /* E2) For the destination address for which the timer | |
535 | * expires, set RTO <- RTO * 2 ("back off the timer"). The | |
536 | * maximum value discussed in rule C7 above (RTO.max) may be | |
537 | * used to provide an upper bound to this doubling operation. | |
faee47cd VY |
538 | * |
539 | * Special Case: the first HB doesn't trigger exponential backoff. | |
3ad2f3fb | 540 | * The first unacknowledged HB triggers it. We do this with a flag |
faee47cd | 541 | * that indicates that we have an outstanding HB. |
1da177e4 | 542 | */ |
7e99013a | 543 | if (!is_hb || transport->hb_sent) { |
faee47cd VY |
544 | transport->rto = min((transport->rto * 2), transport->asoc->rto_max); |
545 | } | |
1da177e4 LT |
546 | } |
547 | ||
548 | /* Worker routine to handle INIT command failure. */ | |
549 | static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands, | |
550 | struct sctp_association *asoc, | |
95c96174 | 551 | unsigned int error) |
1da177e4 LT |
552 | { |
553 | struct sctp_ulpevent *event; | |
554 | ||
555 | event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC, | |
a5a35e76 | 556 | (__u16)error, 0, 0, NULL, |
1da177e4 LT |
557 | GFP_ATOMIC); |
558 | ||
559 | if (event) | |
560 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
561 | SCTP_ULPEVENT(event)); | |
562 | ||
563 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
564 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
565 | ||
566 | /* SEND_FAILED sent later when cleaning up the association. */ | |
567 | asoc->outqueue.error = error; | |
568 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
569 | } | |
570 | ||
571 | /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */ | |
572 | static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands, | |
573 | struct sctp_association *asoc, | |
574 | sctp_event_t event_type, | |
575 | sctp_subtype_t subtype, | |
576 | struct sctp_chunk *chunk, | |
95c96174 | 577 | unsigned int error) |
1da177e4 LT |
578 | { |
579 | struct sctp_ulpevent *event; | |
580 | ||
581 | /* Cancel any partial delivery in progress. */ | |
582 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); | |
583 | ||
a5a35e76 VY |
584 | if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT) |
585 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
586 | (__u16)error, 0, 0, chunk, | |
587 | GFP_ATOMIC); | |
588 | else | |
589 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
590 | (__u16)error, 0, 0, NULL, | |
1da177e4 LT |
591 | GFP_ATOMIC); |
592 | if (event) | |
593 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
594 | SCTP_ULPEVENT(event)); | |
595 | ||
596 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
597 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
598 | ||
1da177e4 LT |
599 | /* SEND_FAILED sent later when cleaning up the association. */ |
600 | asoc->outqueue.error = error; | |
601 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
602 | } | |
603 | ||
604 | /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT | |
605 | * inside the cookie. In reality, this is only used for INIT-ACK processing | |
606 | * since all other cases use "temporary" associations and can do all | |
607 | * their work in statefuns directly. | |
608 | */ | |
609 | static int sctp_cmd_process_init(sctp_cmd_seq_t *commands, | |
610 | struct sctp_association *asoc, | |
611 | struct sctp_chunk *chunk, | |
3182cd84 | 612 | sctp_init_chunk_t *peer_init, |
dd0fc66f | 613 | gfp_t gfp) |
1da177e4 LT |
614 | { |
615 | int error; | |
616 | ||
617 | /* We only process the init as a sideeffect in a single | |
618 | * case. This is when we process the INIT-ACK. If we | |
619 | * fail during INIT processing (due to malloc problems), | |
620 | * just return the error and stop processing the stack. | |
621 | */ | |
de6becdc | 622 | if (!sctp_process_init(asoc, chunk, sctp_source(chunk), peer_init, gfp)) |
1da177e4 LT |
623 | error = -ENOMEM; |
624 | else | |
625 | error = 0; | |
626 | ||
627 | return error; | |
628 | } | |
629 | ||
630 | /* Helper function to break out starting up of heartbeat timers. */ | |
631 | static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds, | |
632 | struct sctp_association *asoc) | |
633 | { | |
634 | struct sctp_transport *t; | |
1da177e4 LT |
635 | |
636 | /* Start a heartbeat timer for each transport on the association. | |
637 | * hold a reference on the transport to make sure none of | |
638 | * the needed data structures go away. | |
639 | */ | |
9dbc15f0 | 640 | list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) { |
1da177e4 LT |
641 | |
642 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) | |
643 | sctp_transport_hold(t); | |
644 | } | |
645 | } | |
646 | ||
647 | static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds, | |
648 | struct sctp_association *asoc) | |
649 | { | |
650 | struct sctp_transport *t; | |
1da177e4 LT |
651 | |
652 | /* Stop all heartbeat timers. */ | |
653 | ||
9dbc15f0 RD |
654 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
655 | transports) { | |
1da177e4 LT |
656 | if (del_timer(&t->hb_timer)) |
657 | sctp_transport_put(t); | |
658 | } | |
659 | } | |
660 | ||
661 | /* Helper function to stop any pending T3-RTX timers */ | |
662 | static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds, | |
d808ad9a | 663 | struct sctp_association *asoc) |
1da177e4 LT |
664 | { |
665 | struct sctp_transport *t; | |
1da177e4 | 666 | |
9dbc15f0 RD |
667 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
668 | transports) { | |
1da177e4 LT |
669 | if (timer_pending(&t->T3_rtx_timer) && |
670 | del_timer(&t->T3_rtx_timer)) { | |
671 | sctp_transport_put(t); | |
672 | } | |
673 | } | |
674 | } | |
675 | ||
676 | ||
677 | /* Helper function to update the heartbeat timer. */ | |
678 | static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds, | |
1da177e4 LT |
679 | struct sctp_transport *t) |
680 | { | |
681 | /* Update the heartbeat timer. */ | |
682 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) | |
683 | sctp_transport_hold(t); | |
684 | } | |
685 | ||
686 | /* Helper function to handle the reception of an HEARTBEAT ACK. */ | |
687 | static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds, | |
688 | struct sctp_association *asoc, | |
689 | struct sctp_transport *t, | |
690 | struct sctp_chunk *chunk) | |
691 | { | |
692 | sctp_sender_hb_info_t *hbinfo; | |
34d2d89f | 693 | int was_unconfirmed = 0; |
1da177e4 LT |
694 | |
695 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the | |
696 | * HEARTBEAT should clear the error counter of the destination | |
697 | * transport address to which the HEARTBEAT was sent. | |
1da177e4 LT |
698 | */ |
699 | t->error_count = 0; | |
f8d96052 TG |
700 | |
701 | /* | |
702 | * Although RFC4960 specifies that the overall error count must | |
703 | * be cleared when a HEARTBEAT ACK is received, we make an | |
704 | * exception while in SHUTDOWN PENDING. If the peer keeps its | |
705 | * window shut forever, we may never be able to transmit our | |
706 | * outstanding data and rely on the retransmission limit be reached | |
707 | * to shutdown the association. | |
708 | */ | |
709 | if (t->asoc->state != SCTP_STATE_SHUTDOWN_PENDING) | |
710 | t->asoc->overall_error_count = 0; | |
1da177e4 | 711 | |
faee47cd VY |
712 | /* Clear the hb_sent flag to signal that we had a good |
713 | * acknowledgement. | |
714 | */ | |
715 | t->hb_sent = 0; | |
716 | ||
1da177e4 LT |
717 | /* Mark the destination transport address as active if it is not so |
718 | * marked. | |
719 | */ | |
34d2d89f MH |
720 | if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) { |
721 | was_unconfirmed = 1; | |
1da177e4 LT |
722 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, |
723 | SCTP_HEARTBEAT_SUCCESS); | |
34d2d89f | 724 | } |
1da177e4 | 725 | |
5aa93bcf NH |
726 | if (t->state == SCTP_PF) |
727 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, | |
728 | SCTP_HEARTBEAT_SUCCESS); | |
729 | ||
1da177e4 LT |
730 | /* The receiver of the HEARTBEAT ACK should also perform an |
731 | * RTT measurement for that destination transport address | |
732 | * using the time value carried in the HEARTBEAT ACK chunk. | |
e533ca16 VY |
733 | * If the transport's rto_pending variable has been cleared, |
734 | * it was most likely due to a retransmit. However, we want | |
735 | * to re-enable it to properly update the rto. | |
1da177e4 | 736 | */ |
e533ca16 VY |
737 | if (t->rto_pending == 0) |
738 | t->rto_pending = 1; | |
739 | ||
1da177e4 LT |
740 | hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data; |
741 | sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at)); | |
ad8fec17 SS |
742 | |
743 | /* Update the heartbeat timer. */ | |
744 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) | |
745 | sctp_transport_hold(t); | |
34d2d89f MH |
746 | |
747 | if (was_unconfirmed && asoc->peer.transport_count == 1) | |
748 | sctp_transport_immediate_rtx(t); | |
1da177e4 LT |
749 | } |
750 | ||
1da177e4 LT |
751 | |
752 | /* Helper function to process the process SACK command. */ | |
753 | static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds, | |
754 | struct sctp_association *asoc, | |
edfee033 | 755 | struct sctp_chunk *chunk) |
1da177e4 | 756 | { |
2e3216cd | 757 | int err = 0; |
1da177e4 | 758 | |
edfee033 | 759 | if (sctp_outq_sack(&asoc->outqueue, chunk)) { |
55e26eb9 EB |
760 | struct net *net = sock_net(asoc->base.sk); |
761 | ||
1da177e4 | 762 | /* There are no more TSNs awaiting SACK. */ |
55e26eb9 | 763 | err = sctp_do_sm(net, SCTP_EVENT_T_OTHER, |
1da177e4 LT |
764 | SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN), |
765 | asoc->state, asoc->ep, asoc, NULL, | |
766 | GFP_ATOMIC); | |
1da177e4 LT |
767 | } |
768 | ||
769 | return err; | |
770 | } | |
771 | ||
772 | /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set | |
773 | * the transport for a shutdown chunk. | |
774 | */ | |
d808ad9a | 775 | static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds, |
1da177e4 LT |
776 | struct sctp_association *asoc, |
777 | struct sctp_chunk *chunk) | |
778 | { | |
779 | struct sctp_transport *t; | |
780 | ||
c17b02b3 VY |
781 | if (chunk->transport) |
782 | t = chunk->transport; | |
783 | else { | |
784 | t = sctp_assoc_choose_alter_transport(asoc, | |
9919b455 | 785 | asoc->shutdown_last_sent_to); |
c17b02b3 VY |
786 | chunk->transport = t; |
787 | } | |
1da177e4 LT |
788 | asoc->shutdown_last_sent_to = t; |
789 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto; | |
1da177e4 LT |
790 | } |
791 | ||
792 | /* Helper function to change the state of an association. */ | |
d808ad9a | 793 | static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds, |
1da177e4 LT |
794 | struct sctp_association *asoc, |
795 | sctp_state_t state) | |
796 | { | |
797 | struct sock *sk = asoc->base.sk; | |
798 | ||
799 | asoc->state = state; | |
800 | ||
3f7a87d2 FF |
801 | SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n", |
802 | asoc, sctp_state_tbl[state]); | |
803 | ||
1da177e4 | 804 | if (sctp_style(sk, TCP)) { |
3f7a87d2 | 805 | /* Change the sk->sk_state of a TCP-style socket that has |
af901ca1 | 806 | * successfully completed a connect() call. |
1da177e4 LT |
807 | */ |
808 | if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED)) | |
809 | sk->sk_state = SCTP_SS_ESTABLISHED; | |
810 | ||
811 | /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */ | |
812 | if (sctp_state(asoc, SHUTDOWN_RECEIVED) && | |
813 | sctp_sstate(sk, ESTABLISHED)) | |
814 | sk->sk_shutdown |= RCV_SHUTDOWN; | |
815 | } | |
816 | ||
3f7a87d2 FF |
817 | if (sctp_state(asoc, COOKIE_WAIT)) { |
818 | /* Reset init timeouts since they may have been | |
819 | * increased due to timer expirations. | |
820 | */ | |
821 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = | |
1e7d3d90 | 822 | asoc->rto_initial; |
3f7a87d2 | 823 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = |
1e7d3d90 | 824 | asoc->rto_initial; |
3f7a87d2 FF |
825 | } |
826 | ||
1da177e4 LT |
827 | if (sctp_state(asoc, ESTABLISHED) || |
828 | sctp_state(asoc, CLOSED) || | |
829 | sctp_state(asoc, SHUTDOWN_RECEIVED)) { | |
830 | /* Wake up any processes waiting in the asoc's wait queue in | |
831 | * sctp_wait_for_connect() or sctp_wait_for_sndbuf(). | |
d808ad9a | 832 | */ |
1da177e4 LT |
833 | if (waitqueue_active(&asoc->wait)) |
834 | wake_up_interruptible(&asoc->wait); | |
835 | ||
836 | /* Wake up any processes waiting in the sk's sleep queue of | |
837 | * a TCP-style or UDP-style peeled-off socket in | |
838 | * sctp_wait_for_accept() or sctp_wait_for_packet(). | |
839 | * For a UDP-style socket, the waiters are woken up by the | |
840 | * notifications. | |
841 | */ | |
842 | if (!sctp_style(sk, UDP)) | |
843 | sk->sk_state_change(sk); | |
844 | } | |
845 | } | |
846 | ||
847 | /* Helper function to delete an association. */ | |
848 | static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds, | |
849 | struct sctp_association *asoc) | |
850 | { | |
851 | struct sock *sk = asoc->base.sk; | |
852 | ||
853 | /* If it is a non-temporary association belonging to a TCP-style | |
d808ad9a | 854 | * listening socket that is not closed, do not free it so that accept() |
1da177e4 | 855 | * can pick it up later. |
d808ad9a | 856 | */ |
1da177e4 LT |
857 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) && |
858 | (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK)) | |
859 | return; | |
860 | ||
861 | sctp_unhash_established(asoc); | |
862 | sctp_association_free(asoc); | |
863 | } | |
864 | ||
865 | /* | |
866 | * ADDIP Section 4.1 ASCONF Chunk Procedures | |
867 | * A4) Start a T-4 RTO timer, using the RTO value of the selected | |
868 | * destination address (we use active path instead of primary path just | |
d808ad9a | 869 | * because primary path may be inactive. |
1da177e4 LT |
870 | */ |
871 | static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds, | |
872 | struct sctp_association *asoc, | |
873 | struct sctp_chunk *chunk) | |
874 | { | |
875 | struct sctp_transport *t; | |
876 | ||
9919b455 | 877 | t = sctp_assoc_choose_alter_transport(asoc, chunk->transport); |
1da177e4 LT |
878 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto; |
879 | chunk->transport = t; | |
880 | } | |
881 | ||
d808ad9a | 882 | /* Process an incoming Operation Error Chunk. */ |
1da177e4 LT |
883 | static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds, |
884 | struct sctp_association *asoc, | |
885 | struct sctp_chunk *chunk) | |
886 | { | |
1da177e4 | 887 | struct sctp_errhdr *err_hdr; |
3df26787 WY |
888 | struct sctp_ulpevent *ev; |
889 | ||
890 | while (chunk->chunk_end > chunk->skb->data) { | |
891 | err_hdr = (struct sctp_errhdr *)(chunk->skb->data); | |
892 | ||
893 | ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0, | |
894 | GFP_ATOMIC); | |
895 | if (!ev) | |
896 | return; | |
897 | ||
898 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
899 | ||
900 | switch (err_hdr->cause) { | |
901 | case SCTP_ERROR_UNKNOWN_CHUNK: | |
902 | { | |
903 | sctp_chunkhdr_t *unk_chunk_hdr; | |
904 | ||
905 | unk_chunk_hdr = (sctp_chunkhdr_t *)err_hdr->variable; | |
906 | switch (unk_chunk_hdr->type) { | |
907 | /* ADDIP 4.1 A9) If the peer responds to an ASCONF with | |
908 | * an ERROR chunk reporting that it did not recognized | |
909 | * the ASCONF chunk type, the sender of the ASCONF MUST | |
910 | * NOT send any further ASCONF chunks and MUST stop its | |
911 | * T-4 timer. | |
912 | */ | |
913 | case SCTP_CID_ASCONF: | |
914 | if (asoc->peer.asconf_capable == 0) | |
915 | break; | |
916 | ||
917 | asoc->peer.asconf_capable = 0; | |
918 | sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP, | |
1da177e4 | 919 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); |
3df26787 WY |
920 | break; |
921 | default: | |
922 | break; | |
923 | } | |
1da177e4 | 924 | break; |
3df26787 | 925 | } |
1da177e4 LT |
926 | default: |
927 | break; | |
928 | } | |
1da177e4 LT |
929 | } |
930 | } | |
931 | ||
932 | /* Process variable FWDTSN chunk information. */ | |
d808ad9a | 933 | static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq, |
1da177e4 LT |
934 | struct sctp_chunk *chunk) |
935 | { | |
936 | struct sctp_fwdtsn_skip *skip; | |
937 | /* Walk through all the skipped SSNs */ | |
938 | sctp_walk_fwdtsn(skip, chunk) { | |
939 | sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn)); | |
940 | } | |
1da177e4 LT |
941 | } |
942 | ||
d808ad9a | 943 | /* Helper function to remove the association non-primary peer |
1da177e4 | 944 | * transports. |
d808ad9a | 945 | */ |
1da177e4 LT |
946 | static void sctp_cmd_del_non_primary(struct sctp_association *asoc) |
947 | { | |
948 | struct sctp_transport *t; | |
949 | struct list_head *pos; | |
950 | struct list_head *temp; | |
951 | ||
952 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
953 | t = list_entry(pos, struct sctp_transport, transports); | |
5f242a13 | 954 | if (!sctp_cmp_addr_exact(&t->ipaddr, |
d808ad9a | 955 | &asoc->peer.primary_addr)) { |
38a03145 | 956 | sctp_assoc_del_peer(asoc, &t->ipaddr); |
1da177e4 LT |
957 | } |
958 | } | |
1da177e4 LT |
959 | } |
960 | ||
8de8c873 SS |
961 | /* Helper function to set sk_err on a 1-1 style socket. */ |
962 | static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error) | |
963 | { | |
964 | struct sock *sk = asoc->base.sk; | |
965 | ||
966 | if (!sctp_style(sk, UDP)) | |
967 | sk->sk_err = error; | |
968 | } | |
969 | ||
07d93967 VY |
970 | /* Helper function to generate an association change event */ |
971 | static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands, | |
972 | struct sctp_association *asoc, | |
973 | u8 state) | |
974 | { | |
975 | struct sctp_ulpevent *ev; | |
976 | ||
977 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0, | |
978 | asoc->c.sinit_num_ostreams, | |
979 | asoc->c.sinit_max_instreams, | |
980 | NULL, GFP_ATOMIC); | |
981 | if (ev) | |
982 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
983 | } | |
984 | ||
985 | /* Helper function to generate an adaptation indication event */ | |
986 | static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands, | |
987 | struct sctp_association *asoc) | |
988 | { | |
989 | struct sctp_ulpevent *ev; | |
990 | ||
991 | ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); | |
992 | ||
993 | if (ev) | |
994 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
995 | } | |
996 | ||
96cd0d3d VY |
997 | |
998 | static void sctp_cmd_t1_timer_update(struct sctp_association *asoc, | |
999 | sctp_event_timeout_t timer, | |
1000 | char *name) | |
1001 | { | |
1002 | struct sctp_transport *t; | |
1003 | ||
1004 | t = asoc->init_last_sent_to; | |
1005 | asoc->init_err_counter++; | |
1006 | ||
1007 | if (t->init_sent_count > (asoc->init_cycle + 1)) { | |
1008 | asoc->timeouts[timer] *= 2; | |
1009 | if (asoc->timeouts[timer] > asoc->max_init_timeo) { | |
1010 | asoc->timeouts[timer] = asoc->max_init_timeo; | |
1011 | } | |
1012 | asoc->init_cycle++; | |
1013 | SCTP_DEBUG_PRINTK( | |
1014 | "T1 %s Timeout adjustment" | |
1015 | " init_err_counter: %d" | |
1016 | " cycle: %d" | |
1017 | " timeout: %ld\n", | |
1018 | name, | |
1019 | asoc->init_err_counter, | |
1020 | asoc->init_cycle, | |
1021 | asoc->timeouts[timer]); | |
1022 | } | |
1023 | ||
1024 | } | |
1025 | ||
9c5c62be VY |
1026 | /* Send the whole message, chunk by chunk, to the outqueue. |
1027 | * This way the whole message is queued up and bundling if | |
1028 | * encouraged for small fragments. | |
1029 | */ | |
1030 | static int sctp_cmd_send_msg(struct sctp_association *asoc, | |
1031 | struct sctp_datamsg *msg) | |
1032 | { | |
1033 | struct sctp_chunk *chunk; | |
1034 | int error = 0; | |
1035 | ||
1036 | list_for_each_entry(chunk, &msg->chunks, frag_list) { | |
1037 | error = sctp_outq_tail(&asoc->outqueue, chunk); | |
1038 | if (error) | |
1039 | break; | |
1040 | } | |
1041 | ||
1042 | return error; | |
1043 | } | |
1044 | ||
1045 | ||
c0786693 VY |
1046 | /* Sent the next ASCONF packet currently stored in the association. |
1047 | * This happens after the ASCONF_ACK was succeffully processed. | |
1048 | */ | |
1049 | static void sctp_cmd_send_asconf(struct sctp_association *asoc) | |
1050 | { | |
55e26eb9 EB |
1051 | struct net *net = sock_net(asoc->base.sk); |
1052 | ||
c0786693 VY |
1053 | /* Send the next asconf chunk from the addip chunk |
1054 | * queue. | |
1055 | */ | |
1056 | if (!list_empty(&asoc->addip_chunk_list)) { | |
1057 | struct list_head *entry = asoc->addip_chunk_list.next; | |
1058 | struct sctp_chunk *asconf = list_entry(entry, | |
1059 | struct sctp_chunk, list); | |
1060 | list_del_init(entry); | |
1061 | ||
1062 | /* Hold the chunk until an ASCONF_ACK is received. */ | |
1063 | sctp_chunk_hold(asconf); | |
55e26eb9 | 1064 | if (sctp_primitive_ASCONF(net, asoc, asconf)) |
c0786693 VY |
1065 | sctp_chunk_free(asconf); |
1066 | else | |
1067 | asoc->addip_last_asconf = asconf; | |
1068 | } | |
1069 | } | |
1070 | ||
9c5c62be | 1071 | |
1da177e4 LT |
1072 | /* These three macros allow us to pull the debugging code out of the |
1073 | * main flow of sctp_do_sm() to keep attention focused on the real | |
1074 | * functionality there. | |
1075 | */ | |
1076 | #define DEBUG_PRE \ | |
1077 | SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \ | |
1078 | "ep %p, %s, %s, asoc %p[%s], %s\n", \ | |
1079 | ep, sctp_evttype_tbl[event_type], \ | |
1080 | (*debug_fn)(subtype), asoc, \ | |
1081 | sctp_state_tbl[state], state_fn->name) | |
1082 | ||
1083 | #define DEBUG_POST \ | |
1084 | SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \ | |
1085 | "asoc %p, status: %s\n", \ | |
1086 | asoc, sctp_status_tbl[status]) | |
1087 | ||
1088 | #define DEBUG_POST_SFX \ | |
1089 | SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \ | |
1090 | error, asoc, \ | |
1091 | sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \ | |
1092 | sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED]) | |
1093 | ||
1094 | /* | |
1095 | * This is the master state machine processing function. | |
1096 | * | |
1097 | * If you want to understand all of lksctp, this is a | |
1098 | * good place to start. | |
1099 | */ | |
55e26eb9 | 1100 | int sctp_do_sm(struct net *net, sctp_event_t event_type, sctp_subtype_t subtype, |
1da177e4 LT |
1101 | sctp_state_t state, |
1102 | struct sctp_endpoint *ep, | |
1103 | struct sctp_association *asoc, | |
1104 | void *event_arg, | |
dd0fc66f | 1105 | gfp_t gfp) |
1da177e4 LT |
1106 | { |
1107 | sctp_cmd_seq_t commands; | |
1108 | const sctp_sm_table_entry_t *state_fn; | |
1109 | sctp_disposition_t status; | |
1110 | int error = 0; | |
1111 | typedef const char *(printfn_t)(sctp_subtype_t); | |
1112 | ||
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 | ||
1125 | DEBUG_PRE; | |
24cb81a6 | 1126 | status = (*state_fn->fn)(net, ep, asoc, subtype, event_arg, &commands); |
1da177e4 LT |
1127 | DEBUG_POST; |
1128 | ||
1129 | error = sctp_side_effects(event_type, subtype, state, | |
d808ad9a | 1130 | ep, asoc, event_arg, status, |
1da177e4 LT |
1131 | &commands, gfp); |
1132 | DEBUG_POST_SFX; | |
1133 | ||
1134 | return error; | |
1135 | } | |
1136 | ||
1137 | #undef DEBUG_PRE | |
1138 | #undef DEBUG_POST | |
1139 | ||
1140 | /***************************************************************** | |
1141 | * This the master state function side effect processing function. | |
1142 | *****************************************************************/ | |
1143 | static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, | |
1144 | sctp_state_t state, | |
1145 | struct sctp_endpoint *ep, | |
1146 | struct sctp_association *asoc, | |
1147 | void *event_arg, | |
1148 | sctp_disposition_t status, | |
1149 | sctp_cmd_seq_t *commands, | |
dd0fc66f | 1150 | gfp_t gfp) |
1da177e4 LT |
1151 | { |
1152 | int error; | |
1153 | ||
1154 | /* FIXME - Most of the dispositions left today would be categorized | |
1155 | * as "exceptional" dispositions. For those dispositions, it | |
1156 | * may not be proper to run through any of the commands at all. | |
1157 | * For example, the command interpreter might be run only with | |
1158 | * disposition SCTP_DISPOSITION_CONSUME. | |
1159 | */ | |
1160 | if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state, | |
1161 | ep, asoc, | |
1162 | event_arg, status, | |
1163 | commands, gfp))) | |
1164 | goto bail; | |
1165 | ||
1166 | switch (status) { | |
1167 | case SCTP_DISPOSITION_DISCARD: | |
1168 | SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, " | |
1169 | "event_type %d, event_id %d\n", | |
1170 | state, event_type, subtype.chunk); | |
1171 | break; | |
1172 | ||
1173 | case SCTP_DISPOSITION_NOMEM: | |
1174 | /* We ran out of memory, so we need to discard this | |
1175 | * packet. | |
1176 | */ | |
1177 | /* BUG--we should now recover some memory, probably by | |
1178 | * reneging... | |
1179 | */ | |
1180 | error = -ENOMEM; | |
1181 | break; | |
1182 | ||
d808ad9a | 1183 | case SCTP_DISPOSITION_DELETE_TCB: |
1da177e4 LT |
1184 | /* This should now be a command. */ |
1185 | break; | |
1186 | ||
1187 | case SCTP_DISPOSITION_CONSUME: | |
1188 | case SCTP_DISPOSITION_ABORT: | |
1189 | /* | |
1190 | * We should no longer have much work to do here as the | |
1191 | * real work has been done as explicit commands above. | |
1192 | */ | |
1193 | break; | |
1194 | ||
1195 | case SCTP_DISPOSITION_VIOLATION: | |
e87cc472 JP |
1196 | net_err_ratelimited("protocol violation state %d chunkid %d\n", |
1197 | state, subtype.chunk); | |
1da177e4 LT |
1198 | break; |
1199 | ||
1200 | case SCTP_DISPOSITION_NOT_IMPL: | |
145ce502 JP |
1201 | pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n", |
1202 | state, event_type, subtype.chunk); | |
1da177e4 LT |
1203 | break; |
1204 | ||
1205 | case SCTP_DISPOSITION_BUG: | |
145ce502 | 1206 | pr_err("bug in state %d, event_type %d, event_id %d\n", |
1da177e4 LT |
1207 | state, event_type, subtype.chunk); |
1208 | BUG(); | |
1209 | break; | |
1210 | ||
1211 | default: | |
145ce502 | 1212 | pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n", |
1da177e4 LT |
1213 | status, state, event_type, subtype.chunk); |
1214 | BUG(); | |
1215 | break; | |
3ff50b79 | 1216 | } |
1da177e4 LT |
1217 | |
1218 | bail: | |
1219 | return error; | |
1220 | } | |
1221 | ||
1222 | /******************************************************************** | |
1223 | * 2nd Level Abstractions | |
1224 | ********************************************************************/ | |
1225 | ||
1226 | /* This is the side-effect interpreter. */ | |
1227 | static int sctp_cmd_interpreter(sctp_event_t event_type, | |
1228 | sctp_subtype_t subtype, | |
1229 | sctp_state_t state, | |
1230 | struct sctp_endpoint *ep, | |
1231 | struct sctp_association *asoc, | |
1232 | void *event_arg, | |
d808ad9a | 1233 | sctp_disposition_t status, |
1da177e4 | 1234 | sctp_cmd_seq_t *commands, |
dd0fc66f | 1235 | gfp_t gfp) |
1da177e4 LT |
1236 | { |
1237 | int error = 0; | |
1238 | int force; | |
1239 | sctp_cmd_t *cmd; | |
1240 | struct sctp_chunk *new_obj; | |
1241 | struct sctp_chunk *chunk = NULL; | |
1242 | struct sctp_packet *packet; | |
1da177e4 LT |
1243 | struct timer_list *timer; |
1244 | unsigned long timeout; | |
1245 | struct sctp_transport *t; | |
1246 | struct sctp_sackhdr sackh; | |
1247 | int local_cork = 0; | |
1248 | ||
1249 | if (SCTP_EVENT_T_TIMEOUT != event_type) | |
ea110733 | 1250 | chunk = event_arg; |
1da177e4 LT |
1251 | |
1252 | /* Note: This whole file is a huge candidate for rework. | |
1253 | * For example, each command could either have its own handler, so | |
1254 | * the loop would look like: | |
1255 | * while (cmds) | |
1256 | * cmd->handle(x, y, z) | |
1257 | * --jgrimm | |
1258 | */ | |
1259 | while (NULL != (cmd = sctp_next_cmd(commands))) { | |
1260 | switch (cmd->verb) { | |
1261 | case SCTP_CMD_NOP: | |
1262 | /* Do nothing. */ | |
1263 | break; | |
1264 | ||
1265 | case SCTP_CMD_NEW_ASOC: | |
1266 | /* Register a new association. */ | |
1267 | if (local_cork) { | |
d808ad9a | 1268 | sctp_outq_uncork(&asoc->outqueue); |
1da177e4 LT |
1269 | local_cork = 0; |
1270 | } | |
b26ddd81 | 1271 | asoc = cmd->obj.asoc; |
1da177e4 LT |
1272 | /* Register with the endpoint. */ |
1273 | sctp_endpoint_add_asoc(ep, asoc); | |
1274 | sctp_hash_established(asoc); | |
1275 | break; | |
1276 | ||
1277 | case SCTP_CMD_UPDATE_ASSOC: | |
b26ddd81 | 1278 | sctp_assoc_update(asoc, cmd->obj.asoc); |
1da177e4 LT |
1279 | break; |
1280 | ||
1281 | case SCTP_CMD_PURGE_OUTQUEUE: | |
1282 | sctp_outq_teardown(&asoc->outqueue); | |
1283 | break; | |
1284 | ||
d808ad9a | 1285 | case SCTP_CMD_DELETE_TCB: |
1da177e4 LT |
1286 | if (local_cork) { |
1287 | sctp_outq_uncork(&asoc->outqueue); | |
1288 | local_cork = 0; | |
1289 | } | |
1290 | /* Delete the current association. */ | |
1291 | sctp_cmd_delete_tcb(commands, asoc); | |
1292 | asoc = NULL; | |
1293 | break; | |
1294 | ||
1295 | case SCTP_CMD_NEW_STATE: | |
1296 | /* Enter a new state. */ | |
1297 | sctp_cmd_new_state(commands, asoc, cmd->obj.state); | |
1298 | break; | |
1299 | ||
1300 | case SCTP_CMD_REPORT_TSN: | |
1301 | /* Record the arrival of a TSN. */ | |
8e1ee18c | 1302 | error = sctp_tsnmap_mark(&asoc->peer.tsn_map, |
4244854d | 1303 | cmd->obj.u32, NULL); |
1da177e4 LT |
1304 | break; |
1305 | ||
1306 | case SCTP_CMD_REPORT_FWDTSN: | |
1307 | /* Move the Cumulattive TSN Ack ahead. */ | |
1308 | sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32); | |
1309 | ||
ea2dfb37 VY |
1310 | /* purge the fragmentation queue */ |
1311 | sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32); | |
1312 | ||
1da177e4 LT |
1313 | /* Abort any in progress partial delivery. */ |
1314 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); | |
1315 | break; | |
1316 | ||
1317 | case SCTP_CMD_PROCESS_FWDTSN: | |
b26ddd81 | 1318 | sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.chunk); |
d808ad9a | 1319 | break; |
1da177e4 LT |
1320 | |
1321 | case SCTP_CMD_GEN_SACK: | |
1322 | /* Generate a Selective ACK. | |
1323 | * The argument tells us whether to just count | |
1324 | * the packet and MAYBE generate a SACK, or | |
1325 | * force a SACK out. | |
1326 | */ | |
1327 | force = cmd->obj.i32; | |
1328 | error = sctp_gen_sack(asoc, force, commands); | |
1329 | break; | |
1330 | ||
1331 | case SCTP_CMD_PROCESS_SACK: | |
1332 | /* Process an inbound SACK. */ | |
1333 | error = sctp_cmd_process_sack(commands, asoc, | |
b26ddd81 | 1334 | cmd->obj.chunk); |
1da177e4 LT |
1335 | break; |
1336 | ||
1337 | case SCTP_CMD_GEN_INIT_ACK: | |
1338 | /* Generate an INIT ACK chunk. */ | |
1339 | new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC, | |
1340 | 0); | |
1341 | if (!new_obj) | |
1342 | goto nomem; | |
1343 | ||
1344 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1345 | SCTP_CHUNK(new_obj)); | |
1346 | break; | |
1347 | ||
1348 | case SCTP_CMD_PEER_INIT: | |
1349 | /* Process a unified INIT from the peer. | |
1350 | * Note: Only used during INIT-ACK processing. If | |
1351 | * there is an error just return to the outter | |
1352 | * layer which will bail. | |
1353 | */ | |
1354 | error = sctp_cmd_process_init(commands, asoc, chunk, | |
b26ddd81 | 1355 | cmd->obj.init, gfp); |
1da177e4 LT |
1356 | break; |
1357 | ||
1358 | case SCTP_CMD_GEN_COOKIE_ECHO: | |
1359 | /* Generate a COOKIE ECHO chunk. */ | |
1360 | new_obj = sctp_make_cookie_echo(asoc, chunk); | |
1361 | if (!new_obj) { | |
b26ddd81 NH |
1362 | if (cmd->obj.chunk) |
1363 | sctp_chunk_free(cmd->obj.chunk); | |
1da177e4 LT |
1364 | goto nomem; |
1365 | } | |
1366 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1367 | SCTP_CHUNK(new_obj)); | |
1368 | ||
1369 | /* If there is an ERROR chunk to be sent along with | |
1370 | * the COOKIE_ECHO, send it, too. | |
1371 | */ | |
b26ddd81 | 1372 | if (cmd->obj.chunk) |
1da177e4 | 1373 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
b26ddd81 | 1374 | SCTP_CHUNK(cmd->obj.chunk)); |
1da177e4 | 1375 | |
96cd0d3d VY |
1376 | if (new_obj->transport) { |
1377 | new_obj->transport->init_sent_count++; | |
1378 | asoc->init_last_sent_to = new_obj->transport; | |
1379 | } | |
1380 | ||
1da177e4 | 1381 | /* FIXME - Eventually come up with a cleaner way to |
d808ad9a YH |
1382 | * enabling COOKIE-ECHO + DATA bundling during |
1383 | * multihoming stale cookie scenarios, the following | |
1384 | * command plays with asoc->peer.retran_path to | |
1385 | * avoid the problem of sending the COOKIE-ECHO and | |
1386 | * DATA in different paths, which could result | |
1387 | * in the association being ABORTed if the DATA chunk | |
1da177e4 LT |
1388 | * is processed first by the server. Checking the |
1389 | * init error counter simply causes this command | |
1390 | * to be executed only during failed attempts of | |
1391 | * association establishment. | |
1392 | */ | |
3f7a87d2 FF |
1393 | if ((asoc->peer.retran_path != |
1394 | asoc->peer.primary_path) && | |
1395 | (asoc->init_err_counter > 0)) { | |
1396 | sctp_add_cmd_sf(commands, | |
d808ad9a | 1397 | SCTP_CMD_FORCE_PRIM_RETRAN, |
1da177e4 LT |
1398 | SCTP_NULL()); |
1399 | } | |
1400 | ||
1401 | break; | |
1402 | ||
1403 | case SCTP_CMD_GEN_SHUTDOWN: | |
1404 | /* Generate SHUTDOWN when in SHUTDOWN_SENT state. | |
1405 | * Reset error counts. | |
1406 | */ | |
1407 | asoc->overall_error_count = 0; | |
1408 | ||
1409 | /* Generate a SHUTDOWN chunk. */ | |
1410 | new_obj = sctp_make_shutdown(asoc, chunk); | |
1411 | if (!new_obj) | |
1412 | goto nomem; | |
1413 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1414 | SCTP_CHUNK(new_obj)); | |
1415 | break; | |
1416 | ||
1417 | case SCTP_CMD_CHUNK_ULP: | |
1418 | /* Send a chunk to the sockets layer. */ | |
1419 | SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n", | |
b26ddd81 | 1420 | "chunk_up:", cmd->obj.chunk, |
1da177e4 | 1421 | "ulpq:", &asoc->ulpq); |
b26ddd81 | 1422 | sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.chunk, |
1da177e4 LT |
1423 | GFP_ATOMIC); |
1424 | break; | |
1425 | ||
1426 | case SCTP_CMD_EVENT_ULP: | |
1427 | /* Send a notification to the sockets layer. */ | |
1428 | SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n", | |
b26ddd81 | 1429 | "event_up:",cmd->obj.ulpevent, |
1da177e4 | 1430 | "ulpq:",&asoc->ulpq); |
b26ddd81 | 1431 | sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ulpevent); |
1da177e4 LT |
1432 | break; |
1433 | ||
1434 | case SCTP_CMD_REPLY: | |
1435 | /* If an caller has not already corked, do cork. */ | |
1436 | if (!asoc->outqueue.cork) { | |
1437 | sctp_outq_cork(&asoc->outqueue); | |
1438 | local_cork = 1; | |
1439 | } | |
1440 | /* Send a chunk to our peer. */ | |
b26ddd81 | 1441 | error = sctp_outq_tail(&asoc->outqueue, cmd->obj.chunk); |
1da177e4 LT |
1442 | break; |
1443 | ||
1444 | case SCTP_CMD_SEND_PKT: | |
1445 | /* Send a full packet to our peer. */ | |
b26ddd81 | 1446 | packet = cmd->obj.packet; |
1da177e4 LT |
1447 | sctp_packet_transmit(packet); |
1448 | sctp_ootb_pkt_free(packet); | |
1449 | break; | |
1450 | ||
b6157d8e VY |
1451 | case SCTP_CMD_T1_RETRAN: |
1452 | /* Mark a transport for retransmission. */ | |
1453 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1454 | SCTP_RTXR_T1_RTX); | |
1455 | break; | |
1456 | ||
1da177e4 LT |
1457 | case SCTP_CMD_RETRAN: |
1458 | /* Mark a transport for retransmission. */ | |
1459 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1460 | SCTP_RTXR_T3_RTX); | |
1461 | break; | |
1462 | ||
1da177e4 LT |
1463 | case SCTP_CMD_ECN_CE: |
1464 | /* Do delayed CE processing. */ | |
1465 | sctp_do_ecn_ce_work(asoc, cmd->obj.u32); | |
1466 | break; | |
1467 | ||
1468 | case SCTP_CMD_ECN_ECNE: | |
1469 | /* Do delayed ECNE processing. */ | |
1470 | new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32, | |
1471 | chunk); | |
1472 | if (new_obj) | |
1473 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1474 | SCTP_CHUNK(new_obj)); | |
1475 | break; | |
1476 | ||
1477 | case SCTP_CMD_ECN_CWR: | |
1478 | /* Do delayed CWR processing. */ | |
1479 | sctp_do_ecn_cwr_work(asoc, cmd->obj.u32); | |
1480 | break; | |
1481 | ||
1482 | case SCTP_CMD_SETUP_T2: | |
b26ddd81 | 1483 | sctp_cmd_setup_t2(commands, asoc, cmd->obj.chunk); |
1da177e4 LT |
1484 | break; |
1485 | ||
f8d96052 TG |
1486 | case SCTP_CMD_TIMER_START_ONCE: |
1487 | timer = &asoc->timers[cmd->obj.to]; | |
1488 | ||
1489 | if (timer_pending(timer)) | |
1490 | break; | |
1491 | /* fall through */ | |
1492 | ||
1da177e4 LT |
1493 | case SCTP_CMD_TIMER_START: |
1494 | timer = &asoc->timers[cmd->obj.to]; | |
1495 | timeout = asoc->timeouts[cmd->obj.to]; | |
09a62660 | 1496 | BUG_ON(!timeout); |
1da177e4 LT |
1497 | |
1498 | timer->expires = jiffies + timeout; | |
1499 | sctp_association_hold(asoc); | |
1500 | add_timer(timer); | |
1501 | break; | |
1502 | ||
1503 | case SCTP_CMD_TIMER_RESTART: | |
1504 | timer = &asoc->timers[cmd->obj.to]; | |
1505 | timeout = asoc->timeouts[cmd->obj.to]; | |
1506 | if (!mod_timer(timer, jiffies + timeout)) | |
1507 | sctp_association_hold(asoc); | |
1508 | break; | |
1509 | ||
1510 | case SCTP_CMD_TIMER_STOP: | |
1511 | timer = &asoc->timers[cmd->obj.to]; | |
1512 | if (timer_pending(timer) && del_timer(timer)) | |
1513 | sctp_association_put(asoc); | |
1514 | break; | |
1515 | ||
3f7a87d2 | 1516 | case SCTP_CMD_INIT_CHOOSE_TRANSPORT: |
b26ddd81 | 1517 | chunk = cmd->obj.chunk; |
9919b455 WY |
1518 | t = sctp_assoc_choose_alter_transport(asoc, |
1519 | asoc->init_last_sent_to); | |
3f7a87d2 FF |
1520 | asoc->init_last_sent_to = t; |
1521 | chunk->transport = t; | |
1522 | t->init_sent_count++; | |
e0e9db17 VY |
1523 | /* Set the new transport as primary */ |
1524 | sctp_assoc_set_primary(asoc, t); | |
3f7a87d2 FF |
1525 | break; |
1526 | ||
1da177e4 LT |
1527 | case SCTP_CMD_INIT_RESTART: |
1528 | /* Do the needed accounting and updates | |
1529 | * associated with restarting an initialization | |
3f7a87d2 FF |
1530 | * timer. Only multiply the timeout by two if |
1531 | * all transports have been tried at the current | |
1532 | * timeout. | |
1533 | */ | |
96cd0d3d VY |
1534 | sctp_cmd_t1_timer_update(asoc, |
1535 | SCTP_EVENT_TIMEOUT_T1_INIT, | |
1536 | "INIT"); | |
3f7a87d2 FF |
1537 | |
1538 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
1539 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
1540 | break; | |
1541 | ||
1542 | case SCTP_CMD_COOKIEECHO_RESTART: | |
1543 | /* Do the needed accounting and updates | |
1544 | * associated with restarting an initialization | |
1545 | * timer. Only multiply the timeout by two if | |
1546 | * all transports have been tried at the current | |
1547 | * timeout. | |
1da177e4 | 1548 | */ |
96cd0d3d VY |
1549 | sctp_cmd_t1_timer_update(asoc, |
1550 | SCTP_EVENT_TIMEOUT_T1_COOKIE, | |
1551 | "COOKIE"); | |
1da177e4 LT |
1552 | |
1553 | /* If we've sent any data bundled with | |
1554 | * COOKIE-ECHO we need to resend. | |
1555 | */ | |
9dbc15f0 RD |
1556 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1557 | transports) { | |
b6157d8e VY |
1558 | sctp_retransmit_mark(&asoc->outqueue, t, |
1559 | SCTP_RTXR_T1_RTX); | |
1da177e4 LT |
1560 | } |
1561 | ||
1562 | sctp_add_cmd_sf(commands, | |
1563 | SCTP_CMD_TIMER_RESTART, | |
3f7a87d2 | 1564 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); |
1da177e4 LT |
1565 | break; |
1566 | ||
1567 | case SCTP_CMD_INIT_FAILED: | |
dc251b2b | 1568 | sctp_cmd_init_failed(commands, asoc, cmd->obj.err); |
1da177e4 LT |
1569 | break; |
1570 | ||
1571 | case SCTP_CMD_ASSOC_FAILED: | |
1572 | sctp_cmd_assoc_failed(commands, asoc, event_type, | |
5be291fe | 1573 | subtype, chunk, cmd->obj.err); |
1da177e4 LT |
1574 | break; |
1575 | ||
3f7a87d2 FF |
1576 | case SCTP_CMD_INIT_COUNTER_INC: |
1577 | asoc->init_err_counter++; | |
1da177e4 LT |
1578 | break; |
1579 | ||
3f7a87d2 FF |
1580 | case SCTP_CMD_INIT_COUNTER_RESET: |
1581 | asoc->init_err_counter = 0; | |
1582 | asoc->init_cycle = 0; | |
96cd0d3d VY |
1583 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1584 | transports) { | |
1585 | t->init_sent_count = 0; | |
1586 | } | |
1da177e4 LT |
1587 | break; |
1588 | ||
1589 | case SCTP_CMD_REPORT_DUP: | |
1590 | sctp_tsnmap_mark_dup(&asoc->peer.tsn_map, | |
1591 | cmd->obj.u32); | |
1592 | break; | |
1593 | ||
1594 | case SCTP_CMD_REPORT_BAD_TAG: | |
1595 | SCTP_DEBUG_PRINTK("vtag mismatch!\n"); | |
1596 | break; | |
1597 | ||
1598 | case SCTP_CMD_STRIKE: | |
1599 | /* Mark one strike against a transport. */ | |
5aa93bcf NH |
1600 | sctp_do_8_2_transport_strike(commands, asoc, |
1601 | cmd->obj.transport, 0); | |
7e99013a VY |
1602 | break; |
1603 | ||
1604 | case SCTP_CMD_TRANSPORT_IDLE: | |
1605 | t = cmd->obj.transport; | |
1606 | sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE); | |
1da177e4 LT |
1607 | break; |
1608 | ||
7e99013a | 1609 | case SCTP_CMD_TRANSPORT_HB_SENT: |
1da177e4 | 1610 | t = cmd->obj.transport; |
5aa93bcf NH |
1611 | sctp_do_8_2_transport_strike(commands, asoc, |
1612 | t, 1); | |
7e99013a | 1613 | t->hb_sent = 1; |
1da177e4 LT |
1614 | break; |
1615 | ||
1616 | case SCTP_CMD_TRANSPORT_ON: | |
1617 | t = cmd->obj.transport; | |
1618 | sctp_cmd_transport_on(commands, asoc, t, chunk); | |
1619 | break; | |
1620 | ||
1621 | case SCTP_CMD_HB_TIMERS_START: | |
1622 | sctp_cmd_hb_timers_start(commands, asoc); | |
1623 | break; | |
1624 | ||
1625 | case SCTP_CMD_HB_TIMER_UPDATE: | |
1626 | t = cmd->obj.transport; | |
765ff02e | 1627 | sctp_cmd_hb_timer_update(commands, t); |
1da177e4 LT |
1628 | break; |
1629 | ||
1630 | case SCTP_CMD_HB_TIMERS_STOP: | |
1631 | sctp_cmd_hb_timers_stop(commands, asoc); | |
1632 | break; | |
1633 | ||
1634 | case SCTP_CMD_REPORT_ERROR: | |
1635 | error = cmd->obj.error; | |
1636 | break; | |
1637 | ||
1638 | case SCTP_CMD_PROCESS_CTSN: | |
1639 | /* Dummy up a SACK for processing. */ | |
2178eda8 | 1640 | sackh.cum_tsn_ack = cmd->obj.be32; |
d4d6fb57 VY |
1641 | sackh.a_rwnd = asoc->peer.rwnd + |
1642 | asoc->outqueue.outstanding_bytes; | |
1da177e4 LT |
1643 | sackh.num_gap_ack_blocks = 0; |
1644 | sackh.num_dup_tsns = 0; | |
f6e80abe | 1645 | chunk->subh.sack_hdr = &sackh; |
1da177e4 | 1646 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, |
f6e80abe | 1647 | SCTP_CHUNK(chunk)); |
1da177e4 LT |
1648 | break; |
1649 | ||
1650 | case SCTP_CMD_DISCARD_PACKET: | |
2e3216cd VY |
1651 | /* We need to discard the whole packet. |
1652 | * Uncork the queue since there might be | |
1653 | * responses pending | |
1654 | */ | |
1da177e4 | 1655 | chunk->pdiscard = 1; |
2e3216cd VY |
1656 | if (asoc) { |
1657 | sctp_outq_uncork(&asoc->outqueue); | |
1658 | local_cork = 0; | |
1659 | } | |
1da177e4 LT |
1660 | break; |
1661 | ||
1662 | case SCTP_CMD_RTO_PENDING: | |
1663 | t = cmd->obj.transport; | |
1664 | t->rto_pending = 1; | |
1665 | break; | |
1666 | ||
1667 | case SCTP_CMD_PART_DELIVER: | |
b26ddd81 | 1668 | sctp_ulpq_partial_delivery(&asoc->ulpq, GFP_ATOMIC); |
1da177e4 LT |
1669 | break; |
1670 | ||
1671 | case SCTP_CMD_RENEGE: | |
b26ddd81 | 1672 | sctp_ulpq_renege(&asoc->ulpq, cmd->obj.chunk, |
1da177e4 LT |
1673 | GFP_ATOMIC); |
1674 | break; | |
1675 | ||
1676 | case SCTP_CMD_SETUP_T4: | |
b26ddd81 | 1677 | sctp_cmd_setup_t4(commands, asoc, cmd->obj.chunk); |
1da177e4 LT |
1678 | break; |
1679 | ||
1680 | case SCTP_CMD_PROCESS_OPERR: | |
1681 | sctp_cmd_process_operr(commands, asoc, chunk); | |
1682 | break; | |
1683 | case SCTP_CMD_CLEAR_INIT_TAG: | |
1684 | asoc->peer.i.init_tag = 0; | |
1685 | break; | |
1686 | case SCTP_CMD_DEL_NON_PRIMARY: | |
1687 | sctp_cmd_del_non_primary(asoc); | |
1688 | break; | |
1689 | case SCTP_CMD_T3_RTX_TIMERS_STOP: | |
1690 | sctp_cmd_t3_rtx_timers_stop(commands, asoc); | |
1691 | break; | |
1692 | case SCTP_CMD_FORCE_PRIM_RETRAN: | |
1693 | t = asoc->peer.retran_path; | |
1694 | asoc->peer.retran_path = asoc->peer.primary_path; | |
1695 | error = sctp_outq_uncork(&asoc->outqueue); | |
1696 | local_cork = 0; | |
1697 | asoc->peer.retran_path = t; | |
1698 | break; | |
8de8c873 SS |
1699 | case SCTP_CMD_SET_SK_ERR: |
1700 | sctp_cmd_set_sk_err(asoc, cmd->obj.error); | |
1701 | break; | |
07d93967 VY |
1702 | case SCTP_CMD_ASSOC_CHANGE: |
1703 | sctp_cmd_assoc_change(commands, asoc, | |
1704 | cmd->obj.u8); | |
1705 | break; | |
1706 | case SCTP_CMD_ADAPTATION_IND: | |
1707 | sctp_cmd_adaptation_ind(commands, asoc); | |
1708 | break; | |
1709 | ||
730fc3d0 VY |
1710 | case SCTP_CMD_ASSOC_SHKEY: |
1711 | error = sctp_auth_asoc_init_active_key(asoc, | |
1712 | GFP_ATOMIC); | |
1713 | break; | |
f4ad85ca GJ |
1714 | case SCTP_CMD_UPDATE_INITTAG: |
1715 | asoc->peer.i.init_tag = cmd->obj.u32; | |
1716 | break; | |
9c5c62be VY |
1717 | case SCTP_CMD_SEND_MSG: |
1718 | if (!asoc->outqueue.cork) { | |
1719 | sctp_outq_cork(&asoc->outqueue); | |
1720 | local_cork = 1; | |
1721 | } | |
1722 | error = sctp_cmd_send_msg(asoc, cmd->obj.msg); | |
1723 | break; | |
c0786693 VY |
1724 | case SCTP_CMD_SEND_NEXT_ASCONF: |
1725 | sctp_cmd_send_asconf(asoc); | |
1726 | break; | |
a000c01e WY |
1727 | case SCTP_CMD_PURGE_ASCONF_QUEUE: |
1728 | sctp_asconf_queue_teardown(asoc); | |
1729 | break; | |
d5ccd496 MM |
1730 | |
1731 | case SCTP_CMD_SET_ASOC: | |
1732 | asoc = cmd->obj.asoc; | |
1733 | break; | |
1734 | ||
1da177e4 | 1735 | default: |
b26ddd81 NH |
1736 | pr_warn("Impossible command: %u\n", |
1737 | cmd->verb); | |
1da177e4 | 1738 | break; |
3ff50b79 SH |
1739 | } |
1740 | ||
1da177e4 LT |
1741 | if (error) |
1742 | break; | |
1743 | } | |
1744 | ||
1745 | out: | |
2e3216cd VY |
1746 | /* If this is in response to a received chunk, wait until |
1747 | * we are done with the packet to open the queue so that we don't | |
1748 | * send multiple packets in response to a single request. | |
1749 | */ | |
1750 | if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) { | |
1751 | if (chunk->end_of_packet || chunk->singleton) | |
d4d6fb57 | 1752 | error = sctp_outq_uncork(&asoc->outqueue); |
2e3216cd | 1753 | } else if (local_cork) |
d4d6fb57 | 1754 | error = sctp_outq_uncork(&asoc->outqueue); |
1da177e4 LT |
1755 | return error; |
1756 | nomem: | |
1757 | error = -ENOMEM; | |
1758 | goto out; | |
1759 | } | |
1760 |