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1da177e4 LT |
1 | /* SCTP kernel reference Implementation |
2 | * (C) Copyright IBM Corp. 2001, 2004 | |
3 | * Copyright (c) 1999 Cisco, Inc. | |
4 | * Copyright (c) 1999-2001 Motorola, Inc. | |
5 | * | |
6 | * This file is part of the SCTP kernel reference Implementation | |
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 | * | |
12 | * The SCTP reference implementation is free software; | |
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 | * | |
18 | * The SCTP reference implementation is distributed in the hope that it | |
19 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied | |
20 | * ************************ | |
21 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
22 | * See the GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
25 | * along with GNU CC; see the file COPYING. If not, write to | |
26 | * the Free Software Foundation, 59 Temple Place - Suite 330, | |
27 | * Boston, MA 02111-1307, USA. | |
28 | * | |
29 | * Please send any bug reports or fixes you make to the | |
30 | * email address(es): | |
31 | * lksctp developers <lksctp-developers@lists.sourceforge.net> | |
32 | * | |
33 | * Or submit a bug report through the following website: | |
34 | * http://www.sf.net/projects/lksctp | |
35 | * | |
36 | * Written or modified by: | |
37 | * La Monte H.P. Yarroll <piggy@acm.org> | |
38 | * Karl Knutson <karl@athena.chicago.il.us> | |
39 | * Jon Grimm <jgrimm@austin.ibm.com> | |
40 | * Hui Huang <hui.huang@nokia.com> | |
41 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
42 | * Daisy Chang <daisyc@us.ibm.com> | |
43 | * Sridhar Samudrala <sri@us.ibm.com> | |
44 | * Ardelle Fan <ardelle.fan@intel.com> | |
45 | * | |
46 | * Any bugs reported given to us we will try to fix... any fixes shared will | |
47 | * be incorporated into the next SCTP release. | |
48 | */ | |
49 | ||
50 | #include <linux/skbuff.h> | |
51 | #include <linux/types.h> | |
52 | #include <linux/socket.h> | |
53 | #include <linux/ip.h> | |
54 | #include <net/sock.h> | |
55 | #include <net/sctp/sctp.h> | |
56 | #include <net/sctp/sm.h> | |
57 | ||
58 | static int sctp_cmd_interpreter(sctp_event_t event_type, | |
59 | sctp_subtype_t subtype, | |
60 | sctp_state_t state, | |
61 | struct sctp_endpoint *ep, | |
62 | struct sctp_association *asoc, | |
63 | void *event_arg, | |
d808ad9a | 64 | sctp_disposition_t status, |
1da177e4 | 65 | sctp_cmd_seq_t *commands, |
dd0fc66f | 66 | gfp_t gfp); |
1da177e4 LT |
67 | static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, |
68 | sctp_state_t state, | |
69 | struct sctp_endpoint *ep, | |
70 | struct sctp_association *asoc, | |
71 | void *event_arg, | |
72 | sctp_disposition_t status, | |
73 | sctp_cmd_seq_t *commands, | |
dd0fc66f | 74 | gfp_t gfp); |
1da177e4 LT |
75 | |
76 | /******************************************************************** | |
77 | * Helper functions | |
78 | ********************************************************************/ | |
79 | ||
80 | /* A helper function for delayed processing of INET ECN CE bit. */ | |
d808ad9a | 81 | static void sctp_do_ecn_ce_work(struct sctp_association *asoc, |
1da177e4 LT |
82 | __u32 lowest_tsn) |
83 | { | |
84 | /* Save the TSN away for comparison when we receive CWR */ | |
85 | ||
86 | asoc->last_ecne_tsn = lowest_tsn; | |
87 | asoc->need_ecne = 1; | |
88 | } | |
89 | ||
90 | /* Helper function for delayed processing of SCTP ECNE chunk. */ | |
91 | /* RFC 2960 Appendix A | |
92 | * | |
93 | * RFC 2481 details a specific bit for a sender to send in | |
94 | * the header of its next outbound TCP segment to indicate to | |
95 | * its peer that it has reduced its congestion window. This | |
96 | * is termed the CWR bit. For SCTP the same indication is made | |
97 | * by including the CWR chunk. This chunk contains one data | |
98 | * element, i.e. the TSN number that was sent in the ECNE chunk. | |
99 | * This element represents the lowest TSN number in the datagram | |
100 | * that was originally marked with the CE bit. | |
101 | */ | |
102 | static struct sctp_chunk *sctp_do_ecn_ecne_work(struct sctp_association *asoc, | |
103 | __u32 lowest_tsn, | |
104 | struct sctp_chunk *chunk) | |
105 | { | |
106 | struct sctp_chunk *repl; | |
107 | ||
108 | /* Our previously transmitted packet ran into some congestion | |
109 | * so we should take action by reducing cwnd and ssthresh | |
110 | * and then ACK our peer that we we've done so by | |
111 | * sending a CWR. | |
112 | */ | |
113 | ||
114 | /* First, try to determine if we want to actually lower | |
115 | * our cwnd variables. Only lower them if the ECNE looks more | |
116 | * recent than the last response. | |
117 | */ | |
118 | if (TSN_lt(asoc->last_cwr_tsn, lowest_tsn)) { | |
119 | struct sctp_transport *transport; | |
120 | ||
121 | /* Find which transport's congestion variables | |
122 | * need to be adjusted. | |
123 | */ | |
124 | transport = sctp_assoc_lookup_tsn(asoc, lowest_tsn); | |
125 | ||
126 | /* Update the congestion variables. */ | |
127 | if (transport) | |
128 | sctp_transport_lower_cwnd(transport, | |
129 | SCTP_LOWER_CWND_ECNE); | |
130 | asoc->last_cwr_tsn = lowest_tsn; | |
131 | } | |
132 | ||
133 | /* Always try to quiet the other end. In case of lost CWR, | |
134 | * resend last_cwr_tsn. | |
135 | */ | |
136 | repl = sctp_make_cwr(asoc, asoc->last_cwr_tsn, chunk); | |
137 | ||
138 | /* If we run out of memory, it will look like a lost CWR. We'll | |
139 | * get back in sync eventually. | |
140 | */ | |
141 | return repl; | |
142 | } | |
143 | ||
144 | /* Helper function to do delayed processing of ECN CWR chunk. */ | |
145 | static void sctp_do_ecn_cwr_work(struct sctp_association *asoc, | |
146 | __u32 lowest_tsn) | |
147 | { | |
148 | /* Turn off ECNE getting auto-prepended to every outgoing | |
149 | * packet | |
150 | */ | |
151 | asoc->need_ecne = 0; | |
152 | } | |
153 | ||
154 | /* Generate SACK if necessary. We call this at the end of a packet. */ | |
155 | static int sctp_gen_sack(struct sctp_association *asoc, int force, | |
156 | sctp_cmd_seq_t *commands) | |
157 | { | |
158 | __u32 ctsn, max_tsn_seen; | |
159 | struct sctp_chunk *sack; | |
52ccb8e9 | 160 | struct sctp_transport *trans = asoc->peer.last_data_from; |
1da177e4 LT |
161 | int error = 0; |
162 | ||
d808ad9a | 163 | if (force || |
52ccb8e9 FF |
164 | (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) || |
165 | (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE))) | |
1da177e4 LT |
166 | asoc->peer.sack_needed = 1; |
167 | ||
168 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); | |
169 | max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map); | |
170 | ||
171 | /* From 12.2 Parameters necessary per association (i.e. the TCB): | |
172 | * | |
173 | * Ack State : This flag indicates if the next received packet | |
174 | * : is to be responded to with a SACK. ... | |
175 | * : When DATA chunks are out of order, SACK's | |
176 | * : are not delayed (see Section 6). | |
177 | * | |
178 | * [This is actually not mentioned in Section 6, but we | |
179 | * implement it here anyway. --piggy] | |
180 | */ | |
d808ad9a | 181 | if (max_tsn_seen != ctsn) |
1da177e4 LT |
182 | asoc->peer.sack_needed = 1; |
183 | ||
184 | /* From 6.2 Acknowledgement on Reception of DATA Chunks: | |
185 | * | |
186 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, | |
187 | * an acknowledgement SHOULD be generated for at least every | |
188 | * second packet (not every second DATA chunk) received, and | |
189 | * SHOULD be generated within 200 ms of the arrival of any | |
190 | * unacknowledged DATA chunk. ... | |
191 | */ | |
192 | if (!asoc->peer.sack_needed) { | |
193 | /* We will need a SACK for the next packet. */ | |
194 | asoc->peer.sack_needed = 1; | |
52ccb8e9 FF |
195 | |
196 | /* Set the SACK delay timeout based on the | |
197 | * SACK delay for the last transport | |
198 | * data was received from, or the default | |
199 | * for the association. | |
200 | */ | |
201 | if (trans) | |
d808ad9a | 202 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
52ccb8e9 FF |
203 | trans->sackdelay; |
204 | else | |
d808ad9a | 205 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
52ccb8e9 FF |
206 | asoc->sackdelay; |
207 | ||
208 | /* Restart the SACK timer. */ | |
209 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
210 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
1da177e4 LT |
211 | } else { |
212 | if (asoc->a_rwnd > asoc->rwnd) | |
213 | asoc->a_rwnd = asoc->rwnd; | |
214 | sack = sctp_make_sack(asoc); | |
215 | if (!sack) | |
216 | goto nomem; | |
217 | ||
218 | asoc->peer.sack_needed = 0; | |
219 | ||
732ba35e | 220 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack)); |
1da177e4 LT |
221 | |
222 | /* Stop the SACK timer. */ | |
223 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
224 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
225 | } | |
52ccb8e9 | 226 | |
1da177e4 LT |
227 | return error; |
228 | nomem: | |
229 | error = -ENOMEM; | |
230 | return error; | |
231 | } | |
232 | ||
233 | /* When the T3-RTX timer expires, it calls this function to create the | |
234 | * relevant state machine event. | |
235 | */ | |
236 | void sctp_generate_t3_rtx_event(unsigned long peer) | |
237 | { | |
238 | int error; | |
239 | struct sctp_transport *transport = (struct sctp_transport *) peer; | |
240 | struct sctp_association *asoc = transport->asoc; | |
241 | ||
242 | /* Check whether a task is in the sock. */ | |
243 | ||
244 | sctp_bh_lock_sock(asoc->base.sk); | |
245 | if (sock_owned_by_user(asoc->base.sk)) { | |
246 | SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __FUNCTION__); | |
247 | ||
248 | /* Try again later. */ | |
249 | if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20))) | |
250 | sctp_transport_hold(transport); | |
251 | goto out_unlock; | |
252 | } | |
253 | ||
254 | /* Is this transport really dead and just waiting around for | |
255 | * the timer to let go of the reference? | |
256 | */ | |
257 | if (transport->dead) | |
258 | goto out_unlock; | |
259 | ||
260 | /* Run through the state machine. */ | |
261 | error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT, | |
262 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX), | |
263 | asoc->state, | |
264 | asoc->ep, asoc, | |
265 | transport, GFP_ATOMIC); | |
266 | ||
267 | if (error) | |
268 | asoc->base.sk->sk_err = -error; | |
269 | ||
270 | out_unlock: | |
271 | sctp_bh_unlock_sock(asoc->base.sk); | |
272 | sctp_transport_put(transport); | |
273 | } | |
274 | ||
275 | /* This is a sa interface for producing timeout events. It works | |
276 | * for timeouts which use the association as their parameter. | |
277 | */ | |
278 | static void sctp_generate_timeout_event(struct sctp_association *asoc, | |
279 | sctp_event_timeout_t timeout_type) | |
280 | { | |
281 | int error = 0; | |
282 | ||
283 | sctp_bh_lock_sock(asoc->base.sk); | |
284 | if (sock_owned_by_user(asoc->base.sk)) { | |
285 | SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n", | |
286 | __FUNCTION__, | |
287 | timeout_type); | |
288 | ||
289 | /* Try again later. */ | |
290 | if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20))) | |
291 | sctp_association_hold(asoc); | |
292 | goto out_unlock; | |
293 | } | |
294 | ||
295 | /* Is this association really dead and just waiting around for | |
296 | * the timer to let go of the reference? | |
297 | */ | |
298 | if (asoc->base.dead) | |
299 | goto out_unlock; | |
300 | ||
301 | /* Run through the state machine. */ | |
302 | error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT, | |
303 | SCTP_ST_TIMEOUT(timeout_type), | |
304 | asoc->state, asoc->ep, asoc, | |
305 | (void *)timeout_type, GFP_ATOMIC); | |
306 | ||
307 | if (error) | |
308 | asoc->base.sk->sk_err = -error; | |
309 | ||
310 | out_unlock: | |
311 | sctp_bh_unlock_sock(asoc->base.sk); | |
312 | sctp_association_put(asoc); | |
313 | } | |
314 | ||
315 | static void sctp_generate_t1_cookie_event(unsigned long data) | |
316 | { | |
317 | struct sctp_association *asoc = (struct sctp_association *) data; | |
318 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE); | |
319 | } | |
320 | ||
321 | static void sctp_generate_t1_init_event(unsigned long data) | |
322 | { | |
323 | struct sctp_association *asoc = (struct sctp_association *) data; | |
324 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT); | |
325 | } | |
326 | ||
327 | static void sctp_generate_t2_shutdown_event(unsigned long data) | |
328 | { | |
329 | struct sctp_association *asoc = (struct sctp_association *) data; | |
330 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN); | |
331 | } | |
332 | ||
333 | static void sctp_generate_t4_rto_event(unsigned long data) | |
334 | { | |
335 | struct sctp_association *asoc = (struct sctp_association *) data; | |
336 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO); | |
337 | } | |
338 | ||
339 | static void sctp_generate_t5_shutdown_guard_event(unsigned long data) | |
340 | { | |
d808ad9a YH |
341 | struct sctp_association *asoc = (struct sctp_association *)data; |
342 | sctp_generate_timeout_event(asoc, | |
1da177e4 LT |
343 | SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD); |
344 | ||
345 | } /* sctp_generate_t5_shutdown_guard_event() */ | |
346 | ||
347 | static void sctp_generate_autoclose_event(unsigned long data) | |
348 | { | |
349 | struct sctp_association *asoc = (struct sctp_association *) data; | |
350 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE); | |
351 | } | |
352 | ||
353 | /* Generate a heart beat event. If the sock is busy, reschedule. Make | |
354 | * sure that the transport is still valid. | |
355 | */ | |
356 | void sctp_generate_heartbeat_event(unsigned long data) | |
357 | { | |
358 | int error = 0; | |
359 | struct sctp_transport *transport = (struct sctp_transport *) data; | |
360 | struct sctp_association *asoc = transport->asoc; | |
361 | ||
362 | sctp_bh_lock_sock(asoc->base.sk); | |
363 | if (sock_owned_by_user(asoc->base.sk)) { | |
364 | SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __FUNCTION__); | |
365 | ||
366 | /* Try again later. */ | |
367 | if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20))) | |
368 | sctp_transport_hold(transport); | |
369 | goto out_unlock; | |
370 | } | |
371 | ||
372 | /* Is this structure just waiting around for us to actually | |
373 | * get destroyed? | |
374 | */ | |
375 | if (transport->dead) | |
376 | goto out_unlock; | |
377 | ||
378 | error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT, | |
379 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT), | |
380 | asoc->state, asoc->ep, asoc, | |
381 | transport, GFP_ATOMIC); | |
382 | ||
d808ad9a | 383 | if (error) |
1da177e4 LT |
384 | asoc->base.sk->sk_err = -error; |
385 | ||
386 | out_unlock: | |
387 | sctp_bh_unlock_sock(asoc->base.sk); | |
388 | sctp_transport_put(transport); | |
389 | } | |
390 | ||
391 | /* Inject a SACK Timeout event into the state machine. */ | |
392 | static void sctp_generate_sack_event(unsigned long data) | |
393 | { | |
394 | struct sctp_association *asoc = (struct sctp_association *) data; | |
395 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK); | |
396 | } | |
397 | ||
398 | sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = { | |
399 | NULL, | |
400 | sctp_generate_t1_cookie_event, | |
401 | sctp_generate_t1_init_event, | |
402 | sctp_generate_t2_shutdown_event, | |
403 | NULL, | |
404 | sctp_generate_t4_rto_event, | |
405 | sctp_generate_t5_shutdown_guard_event, | |
1e7d3d90 | 406 | NULL, |
1da177e4 LT |
407 | sctp_generate_sack_event, |
408 | sctp_generate_autoclose_event, | |
409 | }; | |
410 | ||
411 | ||
412 | /* RFC 2960 8.2 Path Failure Detection | |
413 | * | |
414 | * When its peer endpoint is multi-homed, an endpoint should keep a | |
415 | * error counter for each of the destination transport addresses of the | |
416 | * peer endpoint. | |
417 | * | |
418 | * Each time the T3-rtx timer expires on any address, or when a | |
419 | * HEARTBEAT sent to an idle address is not acknowledged within a RTO, | |
420 | * the error counter of that destination address will be incremented. | |
421 | * When the value in the error counter exceeds the protocol parameter | |
422 | * 'Path.Max.Retrans' of that destination address, the endpoint should | |
423 | * mark the destination transport address as inactive, and a | |
424 | * notification SHOULD be sent to the upper layer. | |
425 | * | |
426 | */ | |
427 | static void sctp_do_8_2_transport_strike(struct sctp_association *asoc, | |
428 | struct sctp_transport *transport) | |
429 | { | |
430 | /* The check for association's overall error counter exceeding the | |
431 | * threshold is done in the state function. | |
432 | */ | |
ad8fec17 SS |
433 | /* When probing UNCONFIRMED addresses, the association overall |
434 | * error count is NOT incremented | |
435 | */ | |
436 | if (transport->state != SCTP_UNCONFIRMED) | |
437 | asoc->overall_error_count++; | |
1da177e4 | 438 | |
3f7a87d2 | 439 | if (transport->state != SCTP_INACTIVE && |
52ccb8e9 | 440 | (transport->error_count++ >= transport->pathmaxrxt)) { |
3f7a87d2 FF |
441 | SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p", |
442 | " transport IP: port:%d failed.\n", | |
443 | asoc, | |
b3f5b3b6 AV |
444 | (&transport->ipaddr), |
445 | ntohs(transport->ipaddr.v4.sin_port)); | |
1da177e4 LT |
446 | sctp_assoc_control_transport(asoc, transport, |
447 | SCTP_TRANSPORT_DOWN, | |
448 | SCTP_FAILED_THRESHOLD); | |
449 | } | |
450 | ||
451 | /* E2) For the destination address for which the timer | |
452 | * expires, set RTO <- RTO * 2 ("back off the timer"). The | |
453 | * maximum value discussed in rule C7 above (RTO.max) may be | |
454 | * used to provide an upper bound to this doubling operation. | |
455 | */ | |
456 | transport->rto = min((transport->rto * 2), transport->asoc->rto_max); | |
457 | } | |
458 | ||
459 | /* Worker routine to handle INIT command failure. */ | |
460 | static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands, | |
461 | struct sctp_association *asoc, | |
462 | unsigned error) | |
463 | { | |
464 | struct sctp_ulpevent *event; | |
465 | ||
466 | event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC, | |
a5a35e76 | 467 | (__u16)error, 0, 0, NULL, |
1da177e4 LT |
468 | GFP_ATOMIC); |
469 | ||
470 | if (event) | |
471 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
472 | SCTP_ULPEVENT(event)); | |
473 | ||
474 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
475 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
476 | ||
477 | /* SEND_FAILED sent later when cleaning up the association. */ | |
478 | asoc->outqueue.error = error; | |
479 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
480 | } | |
481 | ||
482 | /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */ | |
483 | static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands, | |
484 | struct sctp_association *asoc, | |
485 | sctp_event_t event_type, | |
486 | sctp_subtype_t subtype, | |
487 | struct sctp_chunk *chunk, | |
488 | unsigned error) | |
489 | { | |
490 | struct sctp_ulpevent *event; | |
491 | ||
492 | /* Cancel any partial delivery in progress. */ | |
493 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); | |
494 | ||
a5a35e76 VY |
495 | if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT) |
496 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
497 | (__u16)error, 0, 0, chunk, | |
498 | GFP_ATOMIC); | |
499 | else | |
500 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
501 | (__u16)error, 0, 0, NULL, | |
1da177e4 LT |
502 | GFP_ATOMIC); |
503 | if (event) | |
504 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
505 | SCTP_ULPEVENT(event)); | |
506 | ||
507 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
508 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
509 | ||
1da177e4 LT |
510 | /* SEND_FAILED sent later when cleaning up the association. */ |
511 | asoc->outqueue.error = error; | |
512 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
513 | } | |
514 | ||
515 | /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT | |
516 | * inside the cookie. In reality, this is only used for INIT-ACK processing | |
517 | * since all other cases use "temporary" associations and can do all | |
518 | * their work in statefuns directly. | |
519 | */ | |
520 | static int sctp_cmd_process_init(sctp_cmd_seq_t *commands, | |
521 | struct sctp_association *asoc, | |
522 | struct sctp_chunk *chunk, | |
3182cd84 | 523 | sctp_init_chunk_t *peer_init, |
dd0fc66f | 524 | gfp_t gfp) |
1da177e4 LT |
525 | { |
526 | int error; | |
527 | ||
528 | /* We only process the init as a sideeffect in a single | |
529 | * case. This is when we process the INIT-ACK. If we | |
530 | * fail during INIT processing (due to malloc problems), | |
531 | * just return the error and stop processing the stack. | |
532 | */ | |
533 | if (!sctp_process_init(asoc, chunk->chunk_hdr->type, | |
534 | sctp_source(chunk), peer_init, gfp)) | |
535 | error = -ENOMEM; | |
536 | else | |
537 | error = 0; | |
538 | ||
539 | return error; | |
540 | } | |
541 | ||
542 | /* Helper function to break out starting up of heartbeat timers. */ | |
543 | static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds, | |
544 | struct sctp_association *asoc) | |
545 | { | |
546 | struct sctp_transport *t; | |
547 | struct list_head *pos; | |
548 | ||
549 | /* Start a heartbeat timer for each transport on the association. | |
550 | * hold a reference on the transport to make sure none of | |
551 | * the needed data structures go away. | |
552 | */ | |
553 | list_for_each(pos, &asoc->peer.transport_addr_list) { | |
554 | t = list_entry(pos, struct sctp_transport, transports); | |
555 | ||
556 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) | |
557 | sctp_transport_hold(t); | |
558 | } | |
559 | } | |
560 | ||
561 | static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds, | |
562 | struct sctp_association *asoc) | |
563 | { | |
564 | struct sctp_transport *t; | |
565 | struct list_head *pos; | |
566 | ||
567 | /* Stop all heartbeat timers. */ | |
568 | ||
569 | list_for_each(pos, &asoc->peer.transport_addr_list) { | |
570 | t = list_entry(pos, struct sctp_transport, transports); | |
571 | if (del_timer(&t->hb_timer)) | |
572 | sctp_transport_put(t); | |
573 | } | |
574 | } | |
575 | ||
576 | /* Helper function to stop any pending T3-RTX timers */ | |
577 | static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds, | |
d808ad9a | 578 | struct sctp_association *asoc) |
1da177e4 LT |
579 | { |
580 | struct sctp_transport *t; | |
581 | struct list_head *pos; | |
582 | ||
583 | list_for_each(pos, &asoc->peer.transport_addr_list) { | |
584 | t = list_entry(pos, struct sctp_transport, transports); | |
585 | if (timer_pending(&t->T3_rtx_timer) && | |
586 | del_timer(&t->T3_rtx_timer)) { | |
587 | sctp_transport_put(t); | |
588 | } | |
589 | } | |
590 | } | |
591 | ||
592 | ||
593 | /* Helper function to update the heartbeat timer. */ | |
594 | static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds, | |
595 | struct sctp_association *asoc, | |
596 | struct sctp_transport *t) | |
597 | { | |
598 | /* Update the heartbeat timer. */ | |
599 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) | |
600 | sctp_transport_hold(t); | |
601 | } | |
602 | ||
603 | /* Helper function to handle the reception of an HEARTBEAT ACK. */ | |
604 | static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds, | |
605 | struct sctp_association *asoc, | |
606 | struct sctp_transport *t, | |
607 | struct sctp_chunk *chunk) | |
608 | { | |
609 | sctp_sender_hb_info_t *hbinfo; | |
610 | ||
611 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the | |
612 | * HEARTBEAT should clear the error counter of the destination | |
613 | * transport address to which the HEARTBEAT was sent. | |
614 | * The association's overall error count is also cleared. | |
615 | */ | |
616 | t->error_count = 0; | |
617 | t->asoc->overall_error_count = 0; | |
618 | ||
619 | /* Mark the destination transport address as active if it is not so | |
620 | * marked. | |
621 | */ | |
ad8fec17 | 622 | if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) |
1da177e4 LT |
623 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, |
624 | SCTP_HEARTBEAT_SUCCESS); | |
625 | ||
626 | /* The receiver of the HEARTBEAT ACK should also perform an | |
627 | * RTT measurement for that destination transport address | |
628 | * using the time value carried in the HEARTBEAT ACK chunk. | |
e533ca16 VY |
629 | * If the transport's rto_pending variable has been cleared, |
630 | * it was most likely due to a retransmit. However, we want | |
631 | * to re-enable it to properly update the rto. | |
1da177e4 | 632 | */ |
e533ca16 VY |
633 | if (t->rto_pending == 0) |
634 | t->rto_pending = 1; | |
635 | ||
1da177e4 LT |
636 | hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data; |
637 | sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at)); | |
ad8fec17 SS |
638 | |
639 | /* Update the heartbeat timer. */ | |
640 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) | |
641 | sctp_transport_hold(t); | |
1da177e4 LT |
642 | } |
643 | ||
644 | /* Helper function to do a transport reset at the expiry of the hearbeat | |
645 | * timer. | |
646 | */ | |
647 | static void sctp_cmd_transport_reset(sctp_cmd_seq_t *cmds, | |
648 | struct sctp_association *asoc, | |
649 | struct sctp_transport *t) | |
650 | { | |
651 | sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE); | |
652 | ||
653 | /* Mark one strike against a transport. */ | |
654 | sctp_do_8_2_transport_strike(asoc, t); | |
655 | } | |
656 | ||
657 | /* Helper function to process the process SACK command. */ | |
658 | static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds, | |
659 | struct sctp_association *asoc, | |
660 | struct sctp_sackhdr *sackh) | |
661 | { | |
662 | int err; | |
663 | ||
664 | if (sctp_outq_sack(&asoc->outqueue, sackh)) { | |
665 | /* There are no more TSNs awaiting SACK. */ | |
666 | err = sctp_do_sm(SCTP_EVENT_T_OTHER, | |
667 | SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN), | |
668 | asoc->state, asoc->ep, asoc, NULL, | |
669 | GFP_ATOMIC); | |
670 | } else { | |
671 | /* Windows may have opened, so we need | |
672 | * to check if we have DATA to transmit | |
673 | */ | |
674 | err = sctp_outq_flush(&asoc->outqueue, 0); | |
675 | } | |
676 | ||
677 | return err; | |
678 | } | |
679 | ||
680 | /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set | |
681 | * the transport for a shutdown chunk. | |
682 | */ | |
d808ad9a | 683 | static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds, |
1da177e4 LT |
684 | struct sctp_association *asoc, |
685 | struct sctp_chunk *chunk) | |
686 | { | |
687 | struct sctp_transport *t; | |
688 | ||
689 | t = sctp_assoc_choose_shutdown_transport(asoc); | |
690 | asoc->shutdown_last_sent_to = t; | |
691 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto; | |
692 | chunk->transport = t; | |
693 | } | |
694 | ||
695 | /* Helper function to change the state of an association. */ | |
d808ad9a | 696 | static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds, |
1da177e4 LT |
697 | struct sctp_association *asoc, |
698 | sctp_state_t state) | |
699 | { | |
700 | struct sock *sk = asoc->base.sk; | |
701 | ||
702 | asoc->state = state; | |
703 | ||
3f7a87d2 FF |
704 | SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n", |
705 | asoc, sctp_state_tbl[state]); | |
706 | ||
1da177e4 | 707 | if (sctp_style(sk, TCP)) { |
3f7a87d2 | 708 | /* Change the sk->sk_state of a TCP-style socket that has |
1da177e4 LT |
709 | * sucessfully completed a connect() call. |
710 | */ | |
711 | if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED)) | |
712 | sk->sk_state = SCTP_SS_ESTABLISHED; | |
713 | ||
714 | /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */ | |
715 | if (sctp_state(asoc, SHUTDOWN_RECEIVED) && | |
716 | sctp_sstate(sk, ESTABLISHED)) | |
717 | sk->sk_shutdown |= RCV_SHUTDOWN; | |
718 | } | |
719 | ||
3f7a87d2 FF |
720 | if (sctp_state(asoc, COOKIE_WAIT)) { |
721 | /* Reset init timeouts since they may have been | |
722 | * increased due to timer expirations. | |
723 | */ | |
724 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = | |
1e7d3d90 | 725 | asoc->rto_initial; |
3f7a87d2 | 726 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = |
1e7d3d90 | 727 | asoc->rto_initial; |
3f7a87d2 FF |
728 | } |
729 | ||
1da177e4 LT |
730 | if (sctp_state(asoc, ESTABLISHED) || |
731 | sctp_state(asoc, CLOSED) || | |
732 | sctp_state(asoc, SHUTDOWN_RECEIVED)) { | |
733 | /* Wake up any processes waiting in the asoc's wait queue in | |
734 | * sctp_wait_for_connect() or sctp_wait_for_sndbuf(). | |
d808ad9a | 735 | */ |
1da177e4 LT |
736 | if (waitqueue_active(&asoc->wait)) |
737 | wake_up_interruptible(&asoc->wait); | |
738 | ||
739 | /* Wake up any processes waiting in the sk's sleep queue of | |
740 | * a TCP-style or UDP-style peeled-off socket in | |
741 | * sctp_wait_for_accept() or sctp_wait_for_packet(). | |
742 | * For a UDP-style socket, the waiters are woken up by the | |
743 | * notifications. | |
744 | */ | |
745 | if (!sctp_style(sk, UDP)) | |
746 | sk->sk_state_change(sk); | |
747 | } | |
748 | } | |
749 | ||
750 | /* Helper function to delete an association. */ | |
751 | static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds, | |
752 | struct sctp_association *asoc) | |
753 | { | |
754 | struct sock *sk = asoc->base.sk; | |
755 | ||
756 | /* If it is a non-temporary association belonging to a TCP-style | |
d808ad9a | 757 | * listening socket that is not closed, do not free it so that accept() |
1da177e4 | 758 | * can pick it up later. |
d808ad9a | 759 | */ |
1da177e4 LT |
760 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) && |
761 | (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK)) | |
762 | return; | |
763 | ||
764 | sctp_unhash_established(asoc); | |
765 | sctp_association_free(asoc); | |
766 | } | |
767 | ||
768 | /* | |
769 | * ADDIP Section 4.1 ASCONF Chunk Procedures | |
770 | * A4) Start a T-4 RTO timer, using the RTO value of the selected | |
771 | * destination address (we use active path instead of primary path just | |
d808ad9a | 772 | * because primary path may be inactive. |
1da177e4 LT |
773 | */ |
774 | static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds, | |
775 | struct sctp_association *asoc, | |
776 | struct sctp_chunk *chunk) | |
777 | { | |
778 | struct sctp_transport *t; | |
779 | ||
780 | t = asoc->peer.active_path; | |
781 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto; | |
782 | chunk->transport = t; | |
783 | } | |
784 | ||
d808ad9a | 785 | /* Process an incoming Operation Error Chunk. */ |
1da177e4 LT |
786 | static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds, |
787 | struct sctp_association *asoc, | |
788 | struct sctp_chunk *chunk) | |
789 | { | |
790 | struct sctp_operr_chunk *operr_chunk; | |
791 | struct sctp_errhdr *err_hdr; | |
792 | ||
793 | operr_chunk = (struct sctp_operr_chunk *)chunk->chunk_hdr; | |
794 | err_hdr = &operr_chunk->err_hdr; | |
795 | ||
796 | switch (err_hdr->cause) { | |
797 | case SCTP_ERROR_UNKNOWN_CHUNK: | |
798 | { | |
799 | struct sctp_chunkhdr *unk_chunk_hdr; | |
800 | ||
801 | unk_chunk_hdr = (struct sctp_chunkhdr *)err_hdr->variable; | |
802 | switch (unk_chunk_hdr->type) { | |
803 | /* ADDIP 4.1 A9) If the peer responds to an ASCONF with an | |
804 | * ERROR chunk reporting that it did not recognized the ASCONF | |
805 | * chunk type, the sender of the ASCONF MUST NOT send any | |
806 | * further ASCONF chunks and MUST stop its T-4 timer. | |
807 | */ | |
808 | case SCTP_CID_ASCONF: | |
809 | asoc->peer.asconf_capable = 0; | |
810 | sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP, | |
811 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
812 | break; | |
813 | default: | |
814 | break; | |
815 | } | |
816 | break; | |
817 | } | |
818 | default: | |
819 | break; | |
820 | } | |
821 | } | |
822 | ||
823 | /* Process variable FWDTSN chunk information. */ | |
d808ad9a | 824 | static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq, |
1da177e4 LT |
825 | struct sctp_chunk *chunk) |
826 | { | |
827 | struct sctp_fwdtsn_skip *skip; | |
828 | /* Walk through all the skipped SSNs */ | |
829 | sctp_walk_fwdtsn(skip, chunk) { | |
830 | sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn)); | |
831 | } | |
832 | ||
833 | return; | |
834 | } | |
835 | ||
d808ad9a | 836 | /* Helper function to remove the association non-primary peer |
1da177e4 | 837 | * transports. |
d808ad9a | 838 | */ |
1da177e4 LT |
839 | static void sctp_cmd_del_non_primary(struct sctp_association *asoc) |
840 | { | |
841 | struct sctp_transport *t; | |
842 | struct list_head *pos; | |
843 | struct list_head *temp; | |
844 | ||
845 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
846 | t = list_entry(pos, struct sctp_transport, transports); | |
5f242a13 | 847 | if (!sctp_cmp_addr_exact(&t->ipaddr, |
d808ad9a | 848 | &asoc->peer.primary_addr)) { |
38a03145 | 849 | sctp_assoc_del_peer(asoc, &t->ipaddr); |
1da177e4 LT |
850 | } |
851 | } | |
852 | ||
853 | return; | |
854 | } | |
855 | ||
8de8c873 SS |
856 | /* Helper function to set sk_err on a 1-1 style socket. */ |
857 | static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error) | |
858 | { | |
859 | struct sock *sk = asoc->base.sk; | |
860 | ||
861 | if (!sctp_style(sk, UDP)) | |
862 | sk->sk_err = error; | |
863 | } | |
864 | ||
1da177e4 LT |
865 | /* These three macros allow us to pull the debugging code out of the |
866 | * main flow of sctp_do_sm() to keep attention focused on the real | |
867 | * functionality there. | |
868 | */ | |
869 | #define DEBUG_PRE \ | |
870 | SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \ | |
871 | "ep %p, %s, %s, asoc %p[%s], %s\n", \ | |
872 | ep, sctp_evttype_tbl[event_type], \ | |
873 | (*debug_fn)(subtype), asoc, \ | |
874 | sctp_state_tbl[state], state_fn->name) | |
875 | ||
876 | #define DEBUG_POST \ | |
877 | SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \ | |
878 | "asoc %p, status: %s\n", \ | |
879 | asoc, sctp_status_tbl[status]) | |
880 | ||
881 | #define DEBUG_POST_SFX \ | |
882 | SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \ | |
883 | error, asoc, \ | |
884 | sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \ | |
885 | sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED]) | |
886 | ||
887 | /* | |
888 | * This is the master state machine processing function. | |
889 | * | |
890 | * If you want to understand all of lksctp, this is a | |
891 | * good place to start. | |
892 | */ | |
893 | int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype, | |
894 | sctp_state_t state, | |
895 | struct sctp_endpoint *ep, | |
896 | struct sctp_association *asoc, | |
897 | void *event_arg, | |
dd0fc66f | 898 | gfp_t gfp) |
1da177e4 LT |
899 | { |
900 | sctp_cmd_seq_t commands; | |
901 | const sctp_sm_table_entry_t *state_fn; | |
902 | sctp_disposition_t status; | |
903 | int error = 0; | |
904 | typedef const char *(printfn_t)(sctp_subtype_t); | |
905 | ||
906 | static printfn_t *table[] = { | |
907 | NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname, | |
908 | }; | |
909 | printfn_t *debug_fn __attribute__ ((unused)) = table[event_type]; | |
910 | ||
911 | /* Look up the state function, run it, and then process the | |
912 | * side effects. These three steps are the heart of lksctp. | |
913 | */ | |
914 | state_fn = sctp_sm_lookup_event(event_type, state, subtype); | |
915 | ||
916 | sctp_init_cmd_seq(&commands); | |
917 | ||
918 | DEBUG_PRE; | |
919 | status = (*state_fn->fn)(ep, asoc, subtype, event_arg, &commands); | |
920 | DEBUG_POST; | |
921 | ||
922 | error = sctp_side_effects(event_type, subtype, state, | |
d808ad9a | 923 | ep, asoc, event_arg, status, |
1da177e4 LT |
924 | &commands, gfp); |
925 | DEBUG_POST_SFX; | |
926 | ||
927 | return error; | |
928 | } | |
929 | ||
930 | #undef DEBUG_PRE | |
931 | #undef DEBUG_POST | |
932 | ||
933 | /***************************************************************** | |
934 | * This the master state function side effect processing function. | |
935 | *****************************************************************/ | |
936 | static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, | |
937 | sctp_state_t state, | |
938 | struct sctp_endpoint *ep, | |
939 | struct sctp_association *asoc, | |
940 | void *event_arg, | |
941 | sctp_disposition_t status, | |
942 | sctp_cmd_seq_t *commands, | |
dd0fc66f | 943 | gfp_t gfp) |
1da177e4 LT |
944 | { |
945 | int error; | |
946 | ||
947 | /* FIXME - Most of the dispositions left today would be categorized | |
948 | * as "exceptional" dispositions. For those dispositions, it | |
949 | * may not be proper to run through any of the commands at all. | |
950 | * For example, the command interpreter might be run only with | |
951 | * disposition SCTP_DISPOSITION_CONSUME. | |
952 | */ | |
953 | if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state, | |
954 | ep, asoc, | |
955 | event_arg, status, | |
956 | commands, gfp))) | |
957 | goto bail; | |
958 | ||
959 | switch (status) { | |
960 | case SCTP_DISPOSITION_DISCARD: | |
961 | SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, " | |
962 | "event_type %d, event_id %d\n", | |
963 | state, event_type, subtype.chunk); | |
964 | break; | |
965 | ||
966 | case SCTP_DISPOSITION_NOMEM: | |
967 | /* We ran out of memory, so we need to discard this | |
968 | * packet. | |
969 | */ | |
970 | /* BUG--we should now recover some memory, probably by | |
971 | * reneging... | |
972 | */ | |
973 | error = -ENOMEM; | |
974 | break; | |
975 | ||
d808ad9a | 976 | case SCTP_DISPOSITION_DELETE_TCB: |
1da177e4 LT |
977 | /* This should now be a command. */ |
978 | break; | |
979 | ||
980 | case SCTP_DISPOSITION_CONSUME: | |
981 | case SCTP_DISPOSITION_ABORT: | |
982 | /* | |
983 | * We should no longer have much work to do here as the | |
984 | * real work has been done as explicit commands above. | |
985 | */ | |
986 | break; | |
987 | ||
988 | case SCTP_DISPOSITION_VIOLATION: | |
989 | printk(KERN_ERR "sctp protocol violation state %d " | |
990 | "chunkid %d\n", state, subtype.chunk); | |
991 | break; | |
992 | ||
993 | case SCTP_DISPOSITION_NOT_IMPL: | |
994 | printk(KERN_WARNING "sctp unimplemented feature in state %d, " | |
995 | "event_type %d, event_id %d\n", | |
996 | state, event_type, subtype.chunk); | |
997 | break; | |
998 | ||
999 | case SCTP_DISPOSITION_BUG: | |
1000 | printk(KERN_ERR "sctp bug in state %d, " | |
1001 | "event_type %d, event_id %d\n", | |
1002 | state, event_type, subtype.chunk); | |
1003 | BUG(); | |
1004 | break; | |
1005 | ||
1006 | default: | |
1007 | printk(KERN_ERR "sctp impossible disposition %d " | |
1008 | "in state %d, event_type %d, event_id %d\n", | |
1009 | status, state, event_type, subtype.chunk); | |
1010 | BUG(); | |
1011 | break; | |
3ff50b79 | 1012 | } |
1da177e4 LT |
1013 | |
1014 | bail: | |
1015 | return error; | |
1016 | } | |
1017 | ||
1018 | /******************************************************************** | |
1019 | * 2nd Level Abstractions | |
1020 | ********************************************************************/ | |
1021 | ||
1022 | /* This is the side-effect interpreter. */ | |
1023 | static int sctp_cmd_interpreter(sctp_event_t event_type, | |
1024 | sctp_subtype_t subtype, | |
1025 | sctp_state_t state, | |
1026 | struct sctp_endpoint *ep, | |
1027 | struct sctp_association *asoc, | |
1028 | void *event_arg, | |
d808ad9a | 1029 | sctp_disposition_t status, |
1da177e4 | 1030 | sctp_cmd_seq_t *commands, |
dd0fc66f | 1031 | gfp_t gfp) |
1da177e4 LT |
1032 | { |
1033 | int error = 0; | |
1034 | int force; | |
1035 | sctp_cmd_t *cmd; | |
1036 | struct sctp_chunk *new_obj; | |
1037 | struct sctp_chunk *chunk = NULL; | |
1038 | struct sctp_packet *packet; | |
1039 | struct list_head *pos; | |
1040 | struct timer_list *timer; | |
1041 | unsigned long timeout; | |
1042 | struct sctp_transport *t; | |
1043 | struct sctp_sackhdr sackh; | |
1044 | int local_cork = 0; | |
1045 | ||
1046 | if (SCTP_EVENT_T_TIMEOUT != event_type) | |
1047 | chunk = (struct sctp_chunk *) event_arg; | |
1048 | ||
1049 | /* Note: This whole file is a huge candidate for rework. | |
1050 | * For example, each command could either have its own handler, so | |
1051 | * the loop would look like: | |
1052 | * while (cmds) | |
1053 | * cmd->handle(x, y, z) | |
1054 | * --jgrimm | |
1055 | */ | |
1056 | while (NULL != (cmd = sctp_next_cmd(commands))) { | |
1057 | switch (cmd->verb) { | |
1058 | case SCTP_CMD_NOP: | |
1059 | /* Do nothing. */ | |
1060 | break; | |
1061 | ||
1062 | case SCTP_CMD_NEW_ASOC: | |
1063 | /* Register a new association. */ | |
1064 | if (local_cork) { | |
d808ad9a | 1065 | sctp_outq_uncork(&asoc->outqueue); |
1da177e4 LT |
1066 | local_cork = 0; |
1067 | } | |
1068 | asoc = cmd->obj.ptr; | |
1069 | /* Register with the endpoint. */ | |
1070 | sctp_endpoint_add_asoc(ep, asoc); | |
1071 | sctp_hash_established(asoc); | |
1072 | break; | |
1073 | ||
1074 | case SCTP_CMD_UPDATE_ASSOC: | |
1075 | sctp_assoc_update(asoc, cmd->obj.ptr); | |
1076 | break; | |
1077 | ||
1078 | case SCTP_CMD_PURGE_OUTQUEUE: | |
1079 | sctp_outq_teardown(&asoc->outqueue); | |
1080 | break; | |
1081 | ||
d808ad9a | 1082 | case SCTP_CMD_DELETE_TCB: |
1da177e4 LT |
1083 | if (local_cork) { |
1084 | sctp_outq_uncork(&asoc->outqueue); | |
1085 | local_cork = 0; | |
1086 | } | |
1087 | /* Delete the current association. */ | |
1088 | sctp_cmd_delete_tcb(commands, asoc); | |
1089 | asoc = NULL; | |
1090 | break; | |
1091 | ||
1092 | case SCTP_CMD_NEW_STATE: | |
1093 | /* Enter a new state. */ | |
1094 | sctp_cmd_new_state(commands, asoc, cmd->obj.state); | |
1095 | break; | |
1096 | ||
1097 | case SCTP_CMD_REPORT_TSN: | |
1098 | /* Record the arrival of a TSN. */ | |
1099 | sctp_tsnmap_mark(&asoc->peer.tsn_map, cmd->obj.u32); | |
1100 | break; | |
1101 | ||
1102 | case SCTP_CMD_REPORT_FWDTSN: | |
1103 | /* Move the Cumulattive TSN Ack ahead. */ | |
1104 | sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32); | |
1105 | ||
1106 | /* Abort any in progress partial delivery. */ | |
1107 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); | |
1108 | break; | |
1109 | ||
1110 | case SCTP_CMD_PROCESS_FWDTSN: | |
1111 | sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.ptr); | |
d808ad9a | 1112 | break; |
1da177e4 LT |
1113 | |
1114 | case SCTP_CMD_GEN_SACK: | |
1115 | /* Generate a Selective ACK. | |
1116 | * The argument tells us whether to just count | |
1117 | * the packet and MAYBE generate a SACK, or | |
1118 | * force a SACK out. | |
1119 | */ | |
1120 | force = cmd->obj.i32; | |
1121 | error = sctp_gen_sack(asoc, force, commands); | |
1122 | break; | |
1123 | ||
1124 | case SCTP_CMD_PROCESS_SACK: | |
1125 | /* Process an inbound SACK. */ | |
1126 | error = sctp_cmd_process_sack(commands, asoc, | |
1127 | cmd->obj.ptr); | |
1128 | break; | |
1129 | ||
1130 | case SCTP_CMD_GEN_INIT_ACK: | |
1131 | /* Generate an INIT ACK chunk. */ | |
1132 | new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC, | |
1133 | 0); | |
1134 | if (!new_obj) | |
1135 | goto nomem; | |
1136 | ||
1137 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1138 | SCTP_CHUNK(new_obj)); | |
1139 | break; | |
1140 | ||
1141 | case SCTP_CMD_PEER_INIT: | |
1142 | /* Process a unified INIT from the peer. | |
1143 | * Note: Only used during INIT-ACK processing. If | |
1144 | * there is an error just return to the outter | |
1145 | * layer which will bail. | |
1146 | */ | |
1147 | error = sctp_cmd_process_init(commands, asoc, chunk, | |
1148 | cmd->obj.ptr, gfp); | |
1149 | break; | |
1150 | ||
1151 | case SCTP_CMD_GEN_COOKIE_ECHO: | |
1152 | /* Generate a COOKIE ECHO chunk. */ | |
1153 | new_obj = sctp_make_cookie_echo(asoc, chunk); | |
1154 | if (!new_obj) { | |
1155 | if (cmd->obj.ptr) | |
1156 | sctp_chunk_free(cmd->obj.ptr); | |
1157 | goto nomem; | |
1158 | } | |
1159 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1160 | SCTP_CHUNK(new_obj)); | |
1161 | ||
1162 | /* If there is an ERROR chunk to be sent along with | |
1163 | * the COOKIE_ECHO, send it, too. | |
1164 | */ | |
1165 | if (cmd->obj.ptr) | |
1166 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1167 | SCTP_CHUNK(cmd->obj.ptr)); | |
1168 | ||
1169 | /* FIXME - Eventually come up with a cleaner way to | |
d808ad9a YH |
1170 | * enabling COOKIE-ECHO + DATA bundling during |
1171 | * multihoming stale cookie scenarios, the following | |
1172 | * command plays with asoc->peer.retran_path to | |
1173 | * avoid the problem of sending the COOKIE-ECHO and | |
1174 | * DATA in different paths, which could result | |
1175 | * in the association being ABORTed if the DATA chunk | |
1da177e4 LT |
1176 | * is processed first by the server. Checking the |
1177 | * init error counter simply causes this command | |
1178 | * to be executed only during failed attempts of | |
1179 | * association establishment. | |
1180 | */ | |
3f7a87d2 FF |
1181 | if ((asoc->peer.retran_path != |
1182 | asoc->peer.primary_path) && | |
1183 | (asoc->init_err_counter > 0)) { | |
1184 | sctp_add_cmd_sf(commands, | |
d808ad9a | 1185 | SCTP_CMD_FORCE_PRIM_RETRAN, |
1da177e4 LT |
1186 | SCTP_NULL()); |
1187 | } | |
1188 | ||
1189 | break; | |
1190 | ||
1191 | case SCTP_CMD_GEN_SHUTDOWN: | |
1192 | /* Generate SHUTDOWN when in SHUTDOWN_SENT state. | |
1193 | * Reset error counts. | |
1194 | */ | |
1195 | asoc->overall_error_count = 0; | |
1196 | ||
1197 | /* Generate a SHUTDOWN chunk. */ | |
1198 | new_obj = sctp_make_shutdown(asoc, chunk); | |
1199 | if (!new_obj) | |
1200 | goto nomem; | |
1201 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1202 | SCTP_CHUNK(new_obj)); | |
1203 | break; | |
1204 | ||
1205 | case SCTP_CMD_CHUNK_ULP: | |
1206 | /* Send a chunk to the sockets layer. */ | |
1207 | SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n", | |
1208 | "chunk_up:", cmd->obj.ptr, | |
1209 | "ulpq:", &asoc->ulpq); | |
1210 | sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.ptr, | |
1211 | GFP_ATOMIC); | |
1212 | break; | |
1213 | ||
1214 | case SCTP_CMD_EVENT_ULP: | |
1215 | /* Send a notification to the sockets layer. */ | |
1216 | SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n", | |
1217 | "event_up:",cmd->obj.ptr, | |
1218 | "ulpq:",&asoc->ulpq); | |
1219 | sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ptr); | |
1220 | break; | |
1221 | ||
1222 | case SCTP_CMD_REPLY: | |
1223 | /* If an caller has not already corked, do cork. */ | |
1224 | if (!asoc->outqueue.cork) { | |
1225 | sctp_outq_cork(&asoc->outqueue); | |
1226 | local_cork = 1; | |
1227 | } | |
1228 | /* Send a chunk to our peer. */ | |
1229 | error = sctp_outq_tail(&asoc->outqueue, cmd->obj.ptr); | |
1230 | break; | |
1231 | ||
1232 | case SCTP_CMD_SEND_PKT: | |
1233 | /* Send a full packet to our peer. */ | |
1234 | packet = cmd->obj.ptr; | |
1235 | sctp_packet_transmit(packet); | |
1236 | sctp_ootb_pkt_free(packet); | |
1237 | break; | |
1238 | ||
1239 | case SCTP_CMD_RETRAN: | |
1240 | /* Mark a transport for retransmission. */ | |
1241 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1242 | SCTP_RTXR_T3_RTX); | |
1243 | break; | |
1244 | ||
1245 | case SCTP_CMD_TRANSMIT: | |
1246 | /* Kick start transmission. */ | |
1247 | error = sctp_outq_uncork(&asoc->outqueue); | |
1248 | local_cork = 0; | |
1249 | break; | |
1250 | ||
1251 | case SCTP_CMD_ECN_CE: | |
1252 | /* Do delayed CE processing. */ | |
1253 | sctp_do_ecn_ce_work(asoc, cmd->obj.u32); | |
1254 | break; | |
1255 | ||
1256 | case SCTP_CMD_ECN_ECNE: | |
1257 | /* Do delayed ECNE processing. */ | |
1258 | new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32, | |
1259 | chunk); | |
1260 | if (new_obj) | |
1261 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1262 | SCTP_CHUNK(new_obj)); | |
1263 | break; | |
1264 | ||
1265 | case SCTP_CMD_ECN_CWR: | |
1266 | /* Do delayed CWR processing. */ | |
1267 | sctp_do_ecn_cwr_work(asoc, cmd->obj.u32); | |
1268 | break; | |
1269 | ||
1270 | case SCTP_CMD_SETUP_T2: | |
1271 | sctp_cmd_setup_t2(commands, asoc, cmd->obj.ptr); | |
1272 | break; | |
1273 | ||
1274 | case SCTP_CMD_TIMER_START: | |
1275 | timer = &asoc->timers[cmd->obj.to]; | |
1276 | timeout = asoc->timeouts[cmd->obj.to]; | |
09a62660 | 1277 | BUG_ON(!timeout); |
1da177e4 LT |
1278 | |
1279 | timer->expires = jiffies + timeout; | |
1280 | sctp_association_hold(asoc); | |
1281 | add_timer(timer); | |
1282 | break; | |
1283 | ||
1284 | case SCTP_CMD_TIMER_RESTART: | |
1285 | timer = &asoc->timers[cmd->obj.to]; | |
1286 | timeout = asoc->timeouts[cmd->obj.to]; | |
1287 | if (!mod_timer(timer, jiffies + timeout)) | |
1288 | sctp_association_hold(asoc); | |
1289 | break; | |
1290 | ||
1291 | case SCTP_CMD_TIMER_STOP: | |
1292 | timer = &asoc->timers[cmd->obj.to]; | |
1293 | if (timer_pending(timer) && del_timer(timer)) | |
1294 | sctp_association_put(asoc); | |
1295 | break; | |
1296 | ||
3f7a87d2 FF |
1297 | case SCTP_CMD_INIT_CHOOSE_TRANSPORT: |
1298 | chunk = cmd->obj.ptr; | |
1299 | t = sctp_assoc_choose_init_transport(asoc); | |
1300 | asoc->init_last_sent_to = t; | |
1301 | chunk->transport = t; | |
1302 | t->init_sent_count++; | |
1303 | break; | |
1304 | ||
1da177e4 LT |
1305 | case SCTP_CMD_INIT_RESTART: |
1306 | /* Do the needed accounting and updates | |
1307 | * associated with restarting an initialization | |
3f7a87d2 FF |
1308 | * timer. Only multiply the timeout by two if |
1309 | * all transports have been tried at the current | |
1310 | * timeout. | |
1311 | */ | |
1312 | t = asoc->init_last_sent_to; | |
1313 | asoc->init_err_counter++; | |
1314 | ||
1315 | if (t->init_sent_count > (asoc->init_cycle + 1)) { | |
1316 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] *= 2; | |
1317 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] > | |
1318 | asoc->max_init_timeo) { | |
1319 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = | |
1320 | asoc->max_init_timeo; | |
1321 | } | |
1322 | asoc->init_cycle++; | |
1323 | SCTP_DEBUG_PRINTK( | |
1324 | "T1 INIT Timeout adjustment" | |
1325 | " init_err_counter: %d" | |
1326 | " cycle: %d" | |
8116ffad | 1327 | " timeout: %ld\n", |
3f7a87d2 FF |
1328 | asoc->init_err_counter, |
1329 | asoc->init_cycle, | |
1330 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT]); | |
1331 | } | |
1332 | ||
1333 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
1334 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
1335 | break; | |
1336 | ||
1337 | case SCTP_CMD_COOKIEECHO_RESTART: | |
1338 | /* Do the needed accounting and updates | |
1339 | * associated with restarting an initialization | |
1340 | * timer. Only multiply the timeout by two if | |
1341 | * all transports have been tried at the current | |
1342 | * timeout. | |
1da177e4 | 1343 | */ |
3f7a87d2 FF |
1344 | asoc->init_err_counter++; |
1345 | ||
1346 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] *= 2; | |
1347 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] > | |
1da177e4 | 1348 | asoc->max_init_timeo) { |
3f7a87d2 | 1349 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = |
1da177e4 LT |
1350 | asoc->max_init_timeo; |
1351 | } | |
3f7a87d2 FF |
1352 | SCTP_DEBUG_PRINTK( |
1353 | "T1 COOKIE Timeout adjustment" | |
1354 | " init_err_counter: %d" | |
8116ffad | 1355 | " timeout: %ld\n", |
3f7a87d2 FF |
1356 | asoc->init_err_counter, |
1357 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE]); | |
1da177e4 LT |
1358 | |
1359 | /* If we've sent any data bundled with | |
1360 | * COOKIE-ECHO we need to resend. | |
1361 | */ | |
1362 | list_for_each(pos, &asoc->peer.transport_addr_list) { | |
1363 | t = list_entry(pos, struct sctp_transport, | |
1364 | transports); | |
1365 | sctp_retransmit_mark(&asoc->outqueue, t, 0); | |
1366 | } | |
1367 | ||
1368 | sctp_add_cmd_sf(commands, | |
1369 | SCTP_CMD_TIMER_RESTART, | |
3f7a87d2 | 1370 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); |
1da177e4 LT |
1371 | break; |
1372 | ||
1373 | case SCTP_CMD_INIT_FAILED: | |
dc251b2b | 1374 | sctp_cmd_init_failed(commands, asoc, cmd->obj.err); |
1da177e4 LT |
1375 | break; |
1376 | ||
1377 | case SCTP_CMD_ASSOC_FAILED: | |
1378 | sctp_cmd_assoc_failed(commands, asoc, event_type, | |
5be291fe | 1379 | subtype, chunk, cmd->obj.err); |
1da177e4 LT |
1380 | break; |
1381 | ||
3f7a87d2 FF |
1382 | case SCTP_CMD_INIT_COUNTER_INC: |
1383 | asoc->init_err_counter++; | |
1da177e4 LT |
1384 | break; |
1385 | ||
3f7a87d2 FF |
1386 | case SCTP_CMD_INIT_COUNTER_RESET: |
1387 | asoc->init_err_counter = 0; | |
1388 | asoc->init_cycle = 0; | |
1da177e4 LT |
1389 | break; |
1390 | ||
1391 | case SCTP_CMD_REPORT_DUP: | |
1392 | sctp_tsnmap_mark_dup(&asoc->peer.tsn_map, | |
1393 | cmd->obj.u32); | |
1394 | break; | |
1395 | ||
1396 | case SCTP_CMD_REPORT_BAD_TAG: | |
1397 | SCTP_DEBUG_PRINTK("vtag mismatch!\n"); | |
1398 | break; | |
1399 | ||
1400 | case SCTP_CMD_STRIKE: | |
1401 | /* Mark one strike against a transport. */ | |
1402 | sctp_do_8_2_transport_strike(asoc, cmd->obj.transport); | |
1403 | break; | |
1404 | ||
1405 | case SCTP_CMD_TRANSPORT_RESET: | |
1406 | t = cmd->obj.transport; | |
1407 | sctp_cmd_transport_reset(commands, asoc, t); | |
1408 | break; | |
1409 | ||
1410 | case SCTP_CMD_TRANSPORT_ON: | |
1411 | t = cmd->obj.transport; | |
1412 | sctp_cmd_transport_on(commands, asoc, t, chunk); | |
1413 | break; | |
1414 | ||
1415 | case SCTP_CMD_HB_TIMERS_START: | |
1416 | sctp_cmd_hb_timers_start(commands, asoc); | |
1417 | break; | |
1418 | ||
1419 | case SCTP_CMD_HB_TIMER_UPDATE: | |
1420 | t = cmd->obj.transport; | |
1421 | sctp_cmd_hb_timer_update(commands, asoc, t); | |
1422 | break; | |
1423 | ||
1424 | case SCTP_CMD_HB_TIMERS_STOP: | |
1425 | sctp_cmd_hb_timers_stop(commands, asoc); | |
1426 | break; | |
1427 | ||
1428 | case SCTP_CMD_REPORT_ERROR: | |
1429 | error = cmd->obj.error; | |
1430 | break; | |
1431 | ||
1432 | case SCTP_CMD_PROCESS_CTSN: | |
1433 | /* Dummy up a SACK for processing. */ | |
2178eda8 | 1434 | sackh.cum_tsn_ack = cmd->obj.be32; |
1da177e4 LT |
1435 | sackh.a_rwnd = 0; |
1436 | sackh.num_gap_ack_blocks = 0; | |
1437 | sackh.num_dup_tsns = 0; | |
1438 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, | |
1439 | SCTP_SACKH(&sackh)); | |
1440 | break; | |
1441 | ||
1442 | case SCTP_CMD_DISCARD_PACKET: | |
1443 | /* We need to discard the whole packet. */ | |
1444 | chunk->pdiscard = 1; | |
1445 | break; | |
1446 | ||
1447 | case SCTP_CMD_RTO_PENDING: | |
1448 | t = cmd->obj.transport; | |
1449 | t->rto_pending = 1; | |
1450 | break; | |
1451 | ||
1452 | case SCTP_CMD_PART_DELIVER: | |
1453 | sctp_ulpq_partial_delivery(&asoc->ulpq, cmd->obj.ptr, | |
1454 | GFP_ATOMIC); | |
1455 | break; | |
1456 | ||
1457 | case SCTP_CMD_RENEGE: | |
1458 | sctp_ulpq_renege(&asoc->ulpq, cmd->obj.ptr, | |
1459 | GFP_ATOMIC); | |
1460 | break; | |
1461 | ||
1462 | case SCTP_CMD_SETUP_T4: | |
1463 | sctp_cmd_setup_t4(commands, asoc, cmd->obj.ptr); | |
1464 | break; | |
1465 | ||
1466 | case SCTP_CMD_PROCESS_OPERR: | |
1467 | sctp_cmd_process_operr(commands, asoc, chunk); | |
1468 | break; | |
1469 | case SCTP_CMD_CLEAR_INIT_TAG: | |
1470 | asoc->peer.i.init_tag = 0; | |
1471 | break; | |
1472 | case SCTP_CMD_DEL_NON_PRIMARY: | |
1473 | sctp_cmd_del_non_primary(asoc); | |
1474 | break; | |
1475 | case SCTP_CMD_T3_RTX_TIMERS_STOP: | |
1476 | sctp_cmd_t3_rtx_timers_stop(commands, asoc); | |
1477 | break; | |
1478 | case SCTP_CMD_FORCE_PRIM_RETRAN: | |
1479 | t = asoc->peer.retran_path; | |
1480 | asoc->peer.retran_path = asoc->peer.primary_path; | |
1481 | error = sctp_outq_uncork(&asoc->outqueue); | |
1482 | local_cork = 0; | |
1483 | asoc->peer.retran_path = t; | |
1484 | break; | |
8de8c873 SS |
1485 | case SCTP_CMD_SET_SK_ERR: |
1486 | sctp_cmd_set_sk_err(asoc, cmd->obj.error); | |
1487 | break; | |
1da177e4 LT |
1488 | default: |
1489 | printk(KERN_WARNING "Impossible command: %u, %p\n", | |
1490 | cmd->verb, cmd->obj.ptr); | |
1491 | break; | |
3ff50b79 SH |
1492 | } |
1493 | ||
1da177e4 LT |
1494 | if (error) |
1495 | break; | |
1496 | } | |
1497 | ||
1498 | out: | |
1499 | if (local_cork) | |
1500 | sctp_outq_uncork(&asoc->outqueue); | |
1501 | return error; | |
1502 | nomem: | |
1503 | error = -ENOMEM; | |
1504 | goto out; | |
1505 | } | |
1506 |