Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/net/sctp/sm_sideeffect.c
Parent Directory
|
Revision Log
Revision 630 -
(show annotations)
(download)
Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 40048 byte(s)
Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 40048 byte(s)
Tag kernel26-2.6.12-alx-r9
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, |
64 | sctp_disposition_t status, |
65 | sctp_cmd_seq_t *commands, |
66 | int gfp); |
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, |
74 | int gfp); |
75 | |
76 | /******************************************************************** |
77 | * Helper functions |
78 | ********************************************************************/ |
79 | |
80 | /* A helper function for delayed processing of INET ECN CE bit. */ |
81 | static void sctp_do_ecn_ce_work(struct sctp_association *asoc, |
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; |
160 | int error = 0; |
161 | |
162 | if (force) |
163 | asoc->peer.sack_needed = 1; |
164 | |
165 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); |
166 | max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map); |
167 | |
168 | /* From 12.2 Parameters necessary per association (i.e. the TCB): |
169 | * |
170 | * Ack State : This flag indicates if the next received packet |
171 | * : is to be responded to with a SACK. ... |
172 | * : When DATA chunks are out of order, SACK's |
173 | * : are not delayed (see Section 6). |
174 | * |
175 | * [This is actually not mentioned in Section 6, but we |
176 | * implement it here anyway. --piggy] |
177 | */ |
178 | if (max_tsn_seen != ctsn) |
179 | asoc->peer.sack_needed = 1; |
180 | |
181 | /* From 6.2 Acknowledgement on Reception of DATA Chunks: |
182 | * |
183 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, |
184 | * an acknowledgement SHOULD be generated for at least every |
185 | * second packet (not every second DATA chunk) received, and |
186 | * SHOULD be generated within 200 ms of the arrival of any |
187 | * unacknowledged DATA chunk. ... |
188 | */ |
189 | if (!asoc->peer.sack_needed) { |
190 | /* We will need a SACK for the next packet. */ |
191 | asoc->peer.sack_needed = 1; |
192 | goto out; |
193 | } else { |
194 | if (asoc->a_rwnd > asoc->rwnd) |
195 | asoc->a_rwnd = asoc->rwnd; |
196 | sack = sctp_make_sack(asoc); |
197 | if (!sack) |
198 | goto nomem; |
199 | |
200 | asoc->peer.sack_needed = 0; |
201 | |
202 | error = sctp_outq_tail(&asoc->outqueue, sack); |
203 | |
204 | /* Stop the SACK timer. */ |
205 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
206 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); |
207 | } |
208 | out: |
209 | return error; |
210 | nomem: |
211 | error = -ENOMEM; |
212 | return error; |
213 | } |
214 | |
215 | /* When the T3-RTX timer expires, it calls this function to create the |
216 | * relevant state machine event. |
217 | */ |
218 | void sctp_generate_t3_rtx_event(unsigned long peer) |
219 | { |
220 | int error; |
221 | struct sctp_transport *transport = (struct sctp_transport *) peer; |
222 | struct sctp_association *asoc = transport->asoc; |
223 | |
224 | /* Check whether a task is in the sock. */ |
225 | |
226 | sctp_bh_lock_sock(asoc->base.sk); |
227 | if (sock_owned_by_user(asoc->base.sk)) { |
228 | SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __FUNCTION__); |
229 | |
230 | /* Try again later. */ |
231 | if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20))) |
232 | sctp_transport_hold(transport); |
233 | goto out_unlock; |
234 | } |
235 | |
236 | /* Is this transport really dead and just waiting around for |
237 | * the timer to let go of the reference? |
238 | */ |
239 | if (transport->dead) |
240 | goto out_unlock; |
241 | |
242 | /* Run through the state machine. */ |
243 | error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT, |
244 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX), |
245 | asoc->state, |
246 | asoc->ep, asoc, |
247 | transport, GFP_ATOMIC); |
248 | |
249 | if (error) |
250 | asoc->base.sk->sk_err = -error; |
251 | |
252 | out_unlock: |
253 | sctp_bh_unlock_sock(asoc->base.sk); |
254 | sctp_transport_put(transport); |
255 | } |
256 | |
257 | /* This is a sa interface for producing timeout events. It works |
258 | * for timeouts which use the association as their parameter. |
259 | */ |
260 | static void sctp_generate_timeout_event(struct sctp_association *asoc, |
261 | sctp_event_timeout_t timeout_type) |
262 | { |
263 | int error = 0; |
264 | |
265 | sctp_bh_lock_sock(asoc->base.sk); |
266 | if (sock_owned_by_user(asoc->base.sk)) { |
267 | SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n", |
268 | __FUNCTION__, |
269 | timeout_type); |
270 | |
271 | /* Try again later. */ |
272 | if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20))) |
273 | sctp_association_hold(asoc); |
274 | goto out_unlock; |
275 | } |
276 | |
277 | /* Is this association really dead and just waiting around for |
278 | * the timer to let go of the reference? |
279 | */ |
280 | if (asoc->base.dead) |
281 | goto out_unlock; |
282 | |
283 | /* Run through the state machine. */ |
284 | error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT, |
285 | SCTP_ST_TIMEOUT(timeout_type), |
286 | asoc->state, asoc->ep, asoc, |
287 | (void *)timeout_type, GFP_ATOMIC); |
288 | |
289 | if (error) |
290 | asoc->base.sk->sk_err = -error; |
291 | |
292 | out_unlock: |
293 | sctp_bh_unlock_sock(asoc->base.sk); |
294 | sctp_association_put(asoc); |
295 | } |
296 | |
297 | static void sctp_generate_t1_cookie_event(unsigned long data) |
298 | { |
299 | struct sctp_association *asoc = (struct sctp_association *) data; |
300 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE); |
301 | } |
302 | |
303 | static void sctp_generate_t1_init_event(unsigned long data) |
304 | { |
305 | struct sctp_association *asoc = (struct sctp_association *) data; |
306 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT); |
307 | } |
308 | |
309 | static void sctp_generate_t2_shutdown_event(unsigned long data) |
310 | { |
311 | struct sctp_association *asoc = (struct sctp_association *) data; |
312 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN); |
313 | } |
314 | |
315 | static void sctp_generate_t4_rto_event(unsigned long data) |
316 | { |
317 | struct sctp_association *asoc = (struct sctp_association *) data; |
318 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO); |
319 | } |
320 | |
321 | static void sctp_generate_t5_shutdown_guard_event(unsigned long data) |
322 | { |
323 | struct sctp_association *asoc = (struct sctp_association *)data; |
324 | sctp_generate_timeout_event(asoc, |
325 | SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD); |
326 | |
327 | } /* sctp_generate_t5_shutdown_guard_event() */ |
328 | |
329 | static void sctp_generate_autoclose_event(unsigned long data) |
330 | { |
331 | struct sctp_association *asoc = (struct sctp_association *) data; |
332 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE); |
333 | } |
334 | |
335 | /* Generate a heart beat event. If the sock is busy, reschedule. Make |
336 | * sure that the transport is still valid. |
337 | */ |
338 | void sctp_generate_heartbeat_event(unsigned long data) |
339 | { |
340 | int error = 0; |
341 | struct sctp_transport *transport = (struct sctp_transport *) data; |
342 | struct sctp_association *asoc = transport->asoc; |
343 | |
344 | sctp_bh_lock_sock(asoc->base.sk); |
345 | if (sock_owned_by_user(asoc->base.sk)) { |
346 | SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __FUNCTION__); |
347 | |
348 | /* Try again later. */ |
349 | if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20))) |
350 | sctp_transport_hold(transport); |
351 | goto out_unlock; |
352 | } |
353 | |
354 | /* Is this structure just waiting around for us to actually |
355 | * get destroyed? |
356 | */ |
357 | if (transport->dead) |
358 | goto out_unlock; |
359 | |
360 | error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT, |
361 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT), |
362 | asoc->state, asoc->ep, asoc, |
363 | transport, GFP_ATOMIC); |
364 | |
365 | if (error) |
366 | asoc->base.sk->sk_err = -error; |
367 | |
368 | out_unlock: |
369 | sctp_bh_unlock_sock(asoc->base.sk); |
370 | sctp_transport_put(transport); |
371 | } |
372 | |
373 | /* Inject a SACK Timeout event into the state machine. */ |
374 | static void sctp_generate_sack_event(unsigned long data) |
375 | { |
376 | struct sctp_association *asoc = (struct sctp_association *) data; |
377 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK); |
378 | } |
379 | |
380 | sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = { |
381 | NULL, |
382 | sctp_generate_t1_cookie_event, |
383 | sctp_generate_t1_init_event, |
384 | sctp_generate_t2_shutdown_event, |
385 | NULL, |
386 | sctp_generate_t4_rto_event, |
387 | sctp_generate_t5_shutdown_guard_event, |
388 | sctp_generate_heartbeat_event, |
389 | sctp_generate_sack_event, |
390 | sctp_generate_autoclose_event, |
391 | }; |
392 | |
393 | |
394 | /* RFC 2960 8.2 Path Failure Detection |
395 | * |
396 | * When its peer endpoint is multi-homed, an endpoint should keep a |
397 | * error counter for each of the destination transport addresses of the |
398 | * peer endpoint. |
399 | * |
400 | * Each time the T3-rtx timer expires on any address, or when a |
401 | * HEARTBEAT sent to an idle address is not acknowledged within a RTO, |
402 | * the error counter of that destination address will be incremented. |
403 | * When the value in the error counter exceeds the protocol parameter |
404 | * 'Path.Max.Retrans' of that destination address, the endpoint should |
405 | * mark the destination transport address as inactive, and a |
406 | * notification SHOULD be sent to the upper layer. |
407 | * |
408 | */ |
409 | static void sctp_do_8_2_transport_strike(struct sctp_association *asoc, |
410 | struct sctp_transport *transport) |
411 | { |
412 | /* The check for association's overall error counter exceeding the |
413 | * threshold is done in the state function. |
414 | */ |
415 | asoc->overall_error_count++; |
416 | |
417 | if (transport->active && |
418 | (transport->error_count++ >= transport->max_retrans)) { |
419 | SCTP_DEBUG_PRINTK("transport_strike: transport " |
420 | "IP:%d.%d.%d.%d failed.\n", |
421 | NIPQUAD(transport->ipaddr.v4.sin_addr)); |
422 | sctp_assoc_control_transport(asoc, transport, |
423 | SCTP_TRANSPORT_DOWN, |
424 | SCTP_FAILED_THRESHOLD); |
425 | } |
426 | |
427 | /* E2) For the destination address for which the timer |
428 | * expires, set RTO <- RTO * 2 ("back off the timer"). The |
429 | * maximum value discussed in rule C7 above (RTO.max) may be |
430 | * used to provide an upper bound to this doubling operation. |
431 | */ |
432 | transport->rto = min((transport->rto * 2), transport->asoc->rto_max); |
433 | } |
434 | |
435 | /* Worker routine to handle INIT command failure. */ |
436 | static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands, |
437 | struct sctp_association *asoc, |
438 | unsigned error) |
439 | { |
440 | struct sctp_ulpevent *event; |
441 | |
442 | event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC, |
443 | (__u16)error, 0, 0, |
444 | GFP_ATOMIC); |
445 | |
446 | if (event) |
447 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, |
448 | SCTP_ULPEVENT(event)); |
449 | |
450 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
451 | SCTP_STATE(SCTP_STATE_CLOSED)); |
452 | |
453 | /* SEND_FAILED sent later when cleaning up the association. */ |
454 | asoc->outqueue.error = error; |
455 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); |
456 | } |
457 | |
458 | /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */ |
459 | static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands, |
460 | struct sctp_association *asoc, |
461 | sctp_event_t event_type, |
462 | sctp_subtype_t subtype, |
463 | struct sctp_chunk *chunk, |
464 | unsigned error) |
465 | { |
466 | struct sctp_ulpevent *event; |
467 | |
468 | /* Cancel any partial delivery in progress. */ |
469 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); |
470 | |
471 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, |
472 | (__u16)error, 0, 0, |
473 | GFP_ATOMIC); |
474 | if (event) |
475 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, |
476 | SCTP_ULPEVENT(event)); |
477 | |
478 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
479 | SCTP_STATE(SCTP_STATE_CLOSED)); |
480 | |
481 | /* Set sk_err to ECONNRESET on a 1-1 style socket. */ |
482 | if (!sctp_style(asoc->base.sk, UDP)) |
483 | asoc->base.sk->sk_err = ECONNRESET; |
484 | |
485 | /* SEND_FAILED sent later when cleaning up the association. */ |
486 | asoc->outqueue.error = error; |
487 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); |
488 | } |
489 | |
490 | /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT |
491 | * inside the cookie. In reality, this is only used for INIT-ACK processing |
492 | * since all other cases use "temporary" associations and can do all |
493 | * their work in statefuns directly. |
494 | */ |
495 | static int sctp_cmd_process_init(sctp_cmd_seq_t *commands, |
496 | struct sctp_association *asoc, |
497 | struct sctp_chunk *chunk, |
498 | sctp_init_chunk_t *peer_init, int gfp) |
499 | { |
500 | int error; |
501 | |
502 | /* We only process the init as a sideeffect in a single |
503 | * case. This is when we process the INIT-ACK. If we |
504 | * fail during INIT processing (due to malloc problems), |
505 | * just return the error and stop processing the stack. |
506 | */ |
507 | if (!sctp_process_init(asoc, chunk->chunk_hdr->type, |
508 | sctp_source(chunk), peer_init, gfp)) |
509 | error = -ENOMEM; |
510 | else |
511 | error = 0; |
512 | |
513 | return error; |
514 | } |
515 | |
516 | /* Helper function to break out starting up of heartbeat timers. */ |
517 | static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds, |
518 | struct sctp_association *asoc) |
519 | { |
520 | struct sctp_transport *t; |
521 | struct list_head *pos; |
522 | |
523 | /* Start a heartbeat timer for each transport on the association. |
524 | * hold a reference on the transport to make sure none of |
525 | * the needed data structures go away. |
526 | */ |
527 | list_for_each(pos, &asoc->peer.transport_addr_list) { |
528 | t = list_entry(pos, struct sctp_transport, transports); |
529 | |
530 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) |
531 | sctp_transport_hold(t); |
532 | } |
533 | } |
534 | |
535 | static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds, |
536 | struct sctp_association *asoc) |
537 | { |
538 | struct sctp_transport *t; |
539 | struct list_head *pos; |
540 | |
541 | /* Stop all heartbeat timers. */ |
542 | |
543 | list_for_each(pos, &asoc->peer.transport_addr_list) { |
544 | t = list_entry(pos, struct sctp_transport, transports); |
545 | if (del_timer(&t->hb_timer)) |
546 | sctp_transport_put(t); |
547 | } |
548 | } |
549 | |
550 | /* Helper function to stop any pending T3-RTX timers */ |
551 | static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds, |
552 | struct sctp_association *asoc) |
553 | { |
554 | struct sctp_transport *t; |
555 | struct list_head *pos; |
556 | |
557 | list_for_each(pos, &asoc->peer.transport_addr_list) { |
558 | t = list_entry(pos, struct sctp_transport, transports); |
559 | if (timer_pending(&t->T3_rtx_timer) && |
560 | del_timer(&t->T3_rtx_timer)) { |
561 | sctp_transport_put(t); |
562 | } |
563 | } |
564 | } |
565 | |
566 | |
567 | /* Helper function to update the heartbeat timer. */ |
568 | static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds, |
569 | struct sctp_association *asoc, |
570 | struct sctp_transport *t) |
571 | { |
572 | /* Update the heartbeat timer. */ |
573 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) |
574 | sctp_transport_hold(t); |
575 | } |
576 | |
577 | /* Helper function to handle the reception of an HEARTBEAT ACK. */ |
578 | static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds, |
579 | struct sctp_association *asoc, |
580 | struct sctp_transport *t, |
581 | struct sctp_chunk *chunk) |
582 | { |
583 | sctp_sender_hb_info_t *hbinfo; |
584 | |
585 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the |
586 | * HEARTBEAT should clear the error counter of the destination |
587 | * transport address to which the HEARTBEAT was sent. |
588 | * The association's overall error count is also cleared. |
589 | */ |
590 | t->error_count = 0; |
591 | t->asoc->overall_error_count = 0; |
592 | |
593 | /* Mark the destination transport address as active if it is not so |
594 | * marked. |
595 | */ |
596 | if (!t->active) |
597 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, |
598 | SCTP_HEARTBEAT_SUCCESS); |
599 | |
600 | /* The receiver of the HEARTBEAT ACK should also perform an |
601 | * RTT measurement for that destination transport address |
602 | * using the time value carried in the HEARTBEAT ACK chunk. |
603 | */ |
604 | hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data; |
605 | sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at)); |
606 | } |
607 | |
608 | /* Helper function to do a transport reset at the expiry of the hearbeat |
609 | * timer. |
610 | */ |
611 | static void sctp_cmd_transport_reset(sctp_cmd_seq_t *cmds, |
612 | struct sctp_association *asoc, |
613 | struct sctp_transport *t) |
614 | { |
615 | sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE); |
616 | |
617 | /* Mark one strike against a transport. */ |
618 | sctp_do_8_2_transport_strike(asoc, t); |
619 | } |
620 | |
621 | /* Helper function to process the process SACK command. */ |
622 | static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds, |
623 | struct sctp_association *asoc, |
624 | struct sctp_sackhdr *sackh) |
625 | { |
626 | int err; |
627 | |
628 | if (sctp_outq_sack(&asoc->outqueue, sackh)) { |
629 | /* There are no more TSNs awaiting SACK. */ |
630 | err = sctp_do_sm(SCTP_EVENT_T_OTHER, |
631 | SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN), |
632 | asoc->state, asoc->ep, asoc, NULL, |
633 | GFP_ATOMIC); |
634 | } else { |
635 | /* Windows may have opened, so we need |
636 | * to check if we have DATA to transmit |
637 | */ |
638 | err = sctp_outq_flush(&asoc->outqueue, 0); |
639 | } |
640 | |
641 | return err; |
642 | } |
643 | |
644 | /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set |
645 | * the transport for a shutdown chunk. |
646 | */ |
647 | static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds, |
648 | struct sctp_association *asoc, |
649 | struct sctp_chunk *chunk) |
650 | { |
651 | struct sctp_transport *t; |
652 | |
653 | t = sctp_assoc_choose_shutdown_transport(asoc); |
654 | asoc->shutdown_last_sent_to = t; |
655 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto; |
656 | chunk->transport = t; |
657 | } |
658 | |
659 | /* Helper function to change the state of an association. */ |
660 | static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds, |
661 | struct sctp_association *asoc, |
662 | sctp_state_t state) |
663 | { |
664 | struct sock *sk = asoc->base.sk; |
665 | |
666 | asoc->state = state; |
667 | |
668 | if (sctp_style(sk, TCP)) { |
669 | /* Change the sk->sk_state of a TCP-style socket that has |
670 | * sucessfully completed a connect() call. |
671 | */ |
672 | if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED)) |
673 | sk->sk_state = SCTP_SS_ESTABLISHED; |
674 | |
675 | /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */ |
676 | if (sctp_state(asoc, SHUTDOWN_RECEIVED) && |
677 | sctp_sstate(sk, ESTABLISHED)) |
678 | sk->sk_shutdown |= RCV_SHUTDOWN; |
679 | } |
680 | |
681 | if (sctp_state(asoc, ESTABLISHED) || |
682 | sctp_state(asoc, CLOSED) || |
683 | sctp_state(asoc, SHUTDOWN_RECEIVED)) { |
684 | /* Wake up any processes waiting in the asoc's wait queue in |
685 | * sctp_wait_for_connect() or sctp_wait_for_sndbuf(). |
686 | */ |
687 | if (waitqueue_active(&asoc->wait)) |
688 | wake_up_interruptible(&asoc->wait); |
689 | |
690 | /* Wake up any processes waiting in the sk's sleep queue of |
691 | * a TCP-style or UDP-style peeled-off socket in |
692 | * sctp_wait_for_accept() or sctp_wait_for_packet(). |
693 | * For a UDP-style socket, the waiters are woken up by the |
694 | * notifications. |
695 | */ |
696 | if (!sctp_style(sk, UDP)) |
697 | sk->sk_state_change(sk); |
698 | } |
699 | } |
700 | |
701 | /* Helper function to delete an association. */ |
702 | static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds, |
703 | struct sctp_association *asoc) |
704 | { |
705 | struct sock *sk = asoc->base.sk; |
706 | |
707 | /* If it is a non-temporary association belonging to a TCP-style |
708 | * listening socket that is not closed, do not free it so that accept() |
709 | * can pick it up later. |
710 | */ |
711 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) && |
712 | (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK)) |
713 | return; |
714 | |
715 | sctp_unhash_established(asoc); |
716 | sctp_association_free(asoc); |
717 | } |
718 | |
719 | /* |
720 | * ADDIP Section 4.1 ASCONF Chunk Procedures |
721 | * A4) Start a T-4 RTO timer, using the RTO value of the selected |
722 | * destination address (we use active path instead of primary path just |
723 | * because primary path may be inactive. |
724 | */ |
725 | static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds, |
726 | struct sctp_association *asoc, |
727 | struct sctp_chunk *chunk) |
728 | { |
729 | struct sctp_transport *t; |
730 | |
731 | t = asoc->peer.active_path; |
732 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto; |
733 | chunk->transport = t; |
734 | } |
735 | |
736 | /* Process an incoming Operation Error Chunk. */ |
737 | static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds, |
738 | struct sctp_association *asoc, |
739 | struct sctp_chunk *chunk) |
740 | { |
741 | struct sctp_operr_chunk *operr_chunk; |
742 | struct sctp_errhdr *err_hdr; |
743 | |
744 | operr_chunk = (struct sctp_operr_chunk *)chunk->chunk_hdr; |
745 | err_hdr = &operr_chunk->err_hdr; |
746 | |
747 | switch (err_hdr->cause) { |
748 | case SCTP_ERROR_UNKNOWN_CHUNK: |
749 | { |
750 | struct sctp_chunkhdr *unk_chunk_hdr; |
751 | |
752 | unk_chunk_hdr = (struct sctp_chunkhdr *)err_hdr->variable; |
753 | switch (unk_chunk_hdr->type) { |
754 | /* ADDIP 4.1 A9) If the peer responds to an ASCONF with an |
755 | * ERROR chunk reporting that it did not recognized the ASCONF |
756 | * chunk type, the sender of the ASCONF MUST NOT send any |
757 | * further ASCONF chunks and MUST stop its T-4 timer. |
758 | */ |
759 | case SCTP_CID_ASCONF: |
760 | asoc->peer.asconf_capable = 0; |
761 | sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP, |
762 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); |
763 | break; |
764 | default: |
765 | break; |
766 | } |
767 | break; |
768 | } |
769 | default: |
770 | break; |
771 | } |
772 | } |
773 | |
774 | /* Process variable FWDTSN chunk information. */ |
775 | static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq, |
776 | struct sctp_chunk *chunk) |
777 | { |
778 | struct sctp_fwdtsn_skip *skip; |
779 | /* Walk through all the skipped SSNs */ |
780 | sctp_walk_fwdtsn(skip, chunk) { |
781 | sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn)); |
782 | } |
783 | |
784 | return; |
785 | } |
786 | |
787 | /* Helper function to remove the association non-primary peer |
788 | * transports. |
789 | */ |
790 | static void sctp_cmd_del_non_primary(struct sctp_association *asoc) |
791 | { |
792 | struct sctp_transport *t; |
793 | struct list_head *pos; |
794 | struct list_head *temp; |
795 | |
796 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { |
797 | t = list_entry(pos, struct sctp_transport, transports); |
798 | if (!sctp_cmp_addr_exact(&t->ipaddr, |
799 | &asoc->peer.primary_addr)) { |
800 | sctp_assoc_del_peer(asoc, &t->ipaddr); |
801 | } |
802 | } |
803 | |
804 | return; |
805 | } |
806 | |
807 | /* These three macros allow us to pull the debugging code out of the |
808 | * main flow of sctp_do_sm() to keep attention focused on the real |
809 | * functionality there. |
810 | */ |
811 | #define DEBUG_PRE \ |
812 | SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \ |
813 | "ep %p, %s, %s, asoc %p[%s], %s\n", \ |
814 | ep, sctp_evttype_tbl[event_type], \ |
815 | (*debug_fn)(subtype), asoc, \ |
816 | sctp_state_tbl[state], state_fn->name) |
817 | |
818 | #define DEBUG_POST \ |
819 | SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \ |
820 | "asoc %p, status: %s\n", \ |
821 | asoc, sctp_status_tbl[status]) |
822 | |
823 | #define DEBUG_POST_SFX \ |
824 | SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \ |
825 | error, asoc, \ |
826 | sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \ |
827 | sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED]) |
828 | |
829 | /* |
830 | * This is the master state machine processing function. |
831 | * |
832 | * If you want to understand all of lksctp, this is a |
833 | * good place to start. |
834 | */ |
835 | int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype, |
836 | sctp_state_t state, |
837 | struct sctp_endpoint *ep, |
838 | struct sctp_association *asoc, |
839 | void *event_arg, |
840 | int gfp) |
841 | { |
842 | sctp_cmd_seq_t commands; |
843 | const sctp_sm_table_entry_t *state_fn; |
844 | sctp_disposition_t status; |
845 | int error = 0; |
846 | typedef const char *(printfn_t)(sctp_subtype_t); |
847 | |
848 | static printfn_t *table[] = { |
849 | NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname, |
850 | }; |
851 | printfn_t *debug_fn __attribute__ ((unused)) = table[event_type]; |
852 | |
853 | /* Look up the state function, run it, and then process the |
854 | * side effects. These three steps are the heart of lksctp. |
855 | */ |
856 | state_fn = sctp_sm_lookup_event(event_type, state, subtype); |
857 | |
858 | sctp_init_cmd_seq(&commands); |
859 | |
860 | DEBUG_PRE; |
861 | status = (*state_fn->fn)(ep, asoc, subtype, event_arg, &commands); |
862 | DEBUG_POST; |
863 | |
864 | error = sctp_side_effects(event_type, subtype, state, |
865 | ep, asoc, event_arg, status, |
866 | &commands, gfp); |
867 | DEBUG_POST_SFX; |
868 | |
869 | return error; |
870 | } |
871 | |
872 | #undef DEBUG_PRE |
873 | #undef DEBUG_POST |
874 | |
875 | /***************************************************************** |
876 | * This the master state function side effect processing function. |
877 | *****************************************************************/ |
878 | static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, |
879 | sctp_state_t state, |
880 | struct sctp_endpoint *ep, |
881 | struct sctp_association *asoc, |
882 | void *event_arg, |
883 | sctp_disposition_t status, |
884 | sctp_cmd_seq_t *commands, |
885 | int gfp) |
886 | { |
887 | int error; |
888 | |
889 | /* FIXME - Most of the dispositions left today would be categorized |
890 | * as "exceptional" dispositions. For those dispositions, it |
891 | * may not be proper to run through any of the commands at all. |
892 | * For example, the command interpreter might be run only with |
893 | * disposition SCTP_DISPOSITION_CONSUME. |
894 | */ |
895 | if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state, |
896 | ep, asoc, |
897 | event_arg, status, |
898 | commands, gfp))) |
899 | goto bail; |
900 | |
901 | switch (status) { |
902 | case SCTP_DISPOSITION_DISCARD: |
903 | SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, " |
904 | "event_type %d, event_id %d\n", |
905 | state, event_type, subtype.chunk); |
906 | break; |
907 | |
908 | case SCTP_DISPOSITION_NOMEM: |
909 | /* We ran out of memory, so we need to discard this |
910 | * packet. |
911 | */ |
912 | /* BUG--we should now recover some memory, probably by |
913 | * reneging... |
914 | */ |
915 | error = -ENOMEM; |
916 | break; |
917 | |
918 | case SCTP_DISPOSITION_DELETE_TCB: |
919 | /* This should now be a command. */ |
920 | break; |
921 | |
922 | case SCTP_DISPOSITION_CONSUME: |
923 | case SCTP_DISPOSITION_ABORT: |
924 | /* |
925 | * We should no longer have much work to do here as the |
926 | * real work has been done as explicit commands above. |
927 | */ |
928 | break; |
929 | |
930 | case SCTP_DISPOSITION_VIOLATION: |
931 | printk(KERN_ERR "sctp protocol violation state %d " |
932 | "chunkid %d\n", state, subtype.chunk); |
933 | break; |
934 | |
935 | case SCTP_DISPOSITION_NOT_IMPL: |
936 | printk(KERN_WARNING "sctp unimplemented feature in state %d, " |
937 | "event_type %d, event_id %d\n", |
938 | state, event_type, subtype.chunk); |
939 | break; |
940 | |
941 | case SCTP_DISPOSITION_BUG: |
942 | printk(KERN_ERR "sctp bug in state %d, " |
943 | "event_type %d, event_id %d\n", |
944 | state, event_type, subtype.chunk); |
945 | BUG(); |
946 | break; |
947 | |
948 | default: |
949 | printk(KERN_ERR "sctp impossible disposition %d " |
950 | "in state %d, event_type %d, event_id %d\n", |
951 | status, state, event_type, subtype.chunk); |
952 | BUG(); |
953 | break; |
954 | }; |
955 | |
956 | bail: |
957 | return error; |
958 | } |
959 | |
960 | /******************************************************************** |
961 | * 2nd Level Abstractions |
962 | ********************************************************************/ |
963 | |
964 | /* This is the side-effect interpreter. */ |
965 | static int sctp_cmd_interpreter(sctp_event_t event_type, |
966 | sctp_subtype_t subtype, |
967 | sctp_state_t state, |
968 | struct sctp_endpoint *ep, |
969 | struct sctp_association *asoc, |
970 | void *event_arg, |
971 | sctp_disposition_t status, |
972 | sctp_cmd_seq_t *commands, |
973 | int gfp) |
974 | { |
975 | int error = 0; |
976 | int force; |
977 | sctp_cmd_t *cmd; |
978 | struct sctp_chunk *new_obj; |
979 | struct sctp_chunk *chunk = NULL; |
980 | struct sctp_packet *packet; |
981 | struct list_head *pos; |
982 | struct timer_list *timer; |
983 | unsigned long timeout; |
984 | struct sctp_transport *t; |
985 | struct sctp_sackhdr sackh; |
986 | int local_cork = 0; |
987 | |
988 | if (SCTP_EVENT_T_TIMEOUT != event_type) |
989 | chunk = (struct sctp_chunk *) event_arg; |
990 | |
991 | /* Note: This whole file is a huge candidate for rework. |
992 | * For example, each command could either have its own handler, so |
993 | * the loop would look like: |
994 | * while (cmds) |
995 | * cmd->handle(x, y, z) |
996 | * --jgrimm |
997 | */ |
998 | while (NULL != (cmd = sctp_next_cmd(commands))) { |
999 | switch (cmd->verb) { |
1000 | case SCTP_CMD_NOP: |
1001 | /* Do nothing. */ |
1002 | break; |
1003 | |
1004 | case SCTP_CMD_NEW_ASOC: |
1005 | /* Register a new association. */ |
1006 | if (local_cork) { |
1007 | sctp_outq_uncork(&asoc->outqueue); |
1008 | local_cork = 0; |
1009 | } |
1010 | asoc = cmd->obj.ptr; |
1011 | /* Register with the endpoint. */ |
1012 | sctp_endpoint_add_asoc(ep, asoc); |
1013 | sctp_hash_established(asoc); |
1014 | break; |
1015 | |
1016 | case SCTP_CMD_UPDATE_ASSOC: |
1017 | sctp_assoc_update(asoc, cmd->obj.ptr); |
1018 | break; |
1019 | |
1020 | case SCTP_CMD_PURGE_OUTQUEUE: |
1021 | sctp_outq_teardown(&asoc->outqueue); |
1022 | break; |
1023 | |
1024 | case SCTP_CMD_DELETE_TCB: |
1025 | if (local_cork) { |
1026 | sctp_outq_uncork(&asoc->outqueue); |
1027 | local_cork = 0; |
1028 | } |
1029 | /* Delete the current association. */ |
1030 | sctp_cmd_delete_tcb(commands, asoc); |
1031 | asoc = NULL; |
1032 | break; |
1033 | |
1034 | case SCTP_CMD_NEW_STATE: |
1035 | /* Enter a new state. */ |
1036 | sctp_cmd_new_state(commands, asoc, cmd->obj.state); |
1037 | break; |
1038 | |
1039 | case SCTP_CMD_REPORT_TSN: |
1040 | /* Record the arrival of a TSN. */ |
1041 | sctp_tsnmap_mark(&asoc->peer.tsn_map, cmd->obj.u32); |
1042 | break; |
1043 | |
1044 | case SCTP_CMD_REPORT_FWDTSN: |
1045 | /* Move the Cumulattive TSN Ack ahead. */ |
1046 | sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32); |
1047 | |
1048 | /* Abort any in progress partial delivery. */ |
1049 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); |
1050 | break; |
1051 | |
1052 | case SCTP_CMD_PROCESS_FWDTSN: |
1053 | sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.ptr); |
1054 | break; |
1055 | |
1056 | case SCTP_CMD_GEN_SACK: |
1057 | /* Generate a Selective ACK. |
1058 | * The argument tells us whether to just count |
1059 | * the packet and MAYBE generate a SACK, or |
1060 | * force a SACK out. |
1061 | */ |
1062 | force = cmd->obj.i32; |
1063 | error = sctp_gen_sack(asoc, force, commands); |
1064 | break; |
1065 | |
1066 | case SCTP_CMD_PROCESS_SACK: |
1067 | /* Process an inbound SACK. */ |
1068 | error = sctp_cmd_process_sack(commands, asoc, |
1069 | cmd->obj.ptr); |
1070 | break; |
1071 | |
1072 | case SCTP_CMD_GEN_INIT_ACK: |
1073 | /* Generate an INIT ACK chunk. */ |
1074 | new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC, |
1075 | 0); |
1076 | if (!new_obj) |
1077 | goto nomem; |
1078 | |
1079 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
1080 | SCTP_CHUNK(new_obj)); |
1081 | break; |
1082 | |
1083 | case SCTP_CMD_PEER_INIT: |
1084 | /* Process a unified INIT from the peer. |
1085 | * Note: Only used during INIT-ACK processing. If |
1086 | * there is an error just return to the outter |
1087 | * layer which will bail. |
1088 | */ |
1089 | error = sctp_cmd_process_init(commands, asoc, chunk, |
1090 | cmd->obj.ptr, gfp); |
1091 | break; |
1092 | |
1093 | case SCTP_CMD_GEN_COOKIE_ECHO: |
1094 | /* Generate a COOKIE ECHO chunk. */ |
1095 | new_obj = sctp_make_cookie_echo(asoc, chunk); |
1096 | if (!new_obj) { |
1097 | if (cmd->obj.ptr) |
1098 | sctp_chunk_free(cmd->obj.ptr); |
1099 | goto nomem; |
1100 | } |
1101 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
1102 | SCTP_CHUNK(new_obj)); |
1103 | |
1104 | /* If there is an ERROR chunk to be sent along with |
1105 | * the COOKIE_ECHO, send it, too. |
1106 | */ |
1107 | if (cmd->obj.ptr) |
1108 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
1109 | SCTP_CHUNK(cmd->obj.ptr)); |
1110 | |
1111 | /* FIXME - Eventually come up with a cleaner way to |
1112 | * enabling COOKIE-ECHO + DATA bundling during |
1113 | * multihoming stale cookie scenarios, the following |
1114 | * command plays with asoc->peer.retran_path to |
1115 | * avoid the problem of sending the COOKIE-ECHO and |
1116 | * DATA in different paths, which could result |
1117 | * in the association being ABORTed if the DATA chunk |
1118 | * is processed first by the server. Checking the |
1119 | * init error counter simply causes this command |
1120 | * to be executed only during failed attempts of |
1121 | * association establishment. |
1122 | */ |
1123 | if ((asoc->peer.retran_path != |
1124 | asoc->peer.primary_path) && |
1125 | (asoc->counters[SCTP_COUNTER_INIT_ERROR] > 0)) { |
1126 | sctp_add_cmd_sf(commands, |
1127 | SCTP_CMD_FORCE_PRIM_RETRAN, |
1128 | SCTP_NULL()); |
1129 | } |
1130 | |
1131 | break; |
1132 | |
1133 | case SCTP_CMD_GEN_SHUTDOWN: |
1134 | /* Generate SHUTDOWN when in SHUTDOWN_SENT state. |
1135 | * Reset error counts. |
1136 | */ |
1137 | asoc->overall_error_count = 0; |
1138 | |
1139 | /* Generate a SHUTDOWN chunk. */ |
1140 | new_obj = sctp_make_shutdown(asoc, chunk); |
1141 | if (!new_obj) |
1142 | goto nomem; |
1143 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
1144 | SCTP_CHUNK(new_obj)); |
1145 | break; |
1146 | |
1147 | case SCTP_CMD_CHUNK_ULP: |
1148 | /* Send a chunk to the sockets layer. */ |
1149 | SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n", |
1150 | "chunk_up:", cmd->obj.ptr, |
1151 | "ulpq:", &asoc->ulpq); |
1152 | sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.ptr, |
1153 | GFP_ATOMIC); |
1154 | break; |
1155 | |
1156 | case SCTP_CMD_EVENT_ULP: |
1157 | /* Send a notification to the sockets layer. */ |
1158 | SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n", |
1159 | "event_up:",cmd->obj.ptr, |
1160 | "ulpq:",&asoc->ulpq); |
1161 | sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ptr); |
1162 | break; |
1163 | |
1164 | case SCTP_CMD_REPLY: |
1165 | /* If an caller has not already corked, do cork. */ |
1166 | if (!asoc->outqueue.cork) { |
1167 | sctp_outq_cork(&asoc->outqueue); |
1168 | local_cork = 1; |
1169 | } |
1170 | /* Send a chunk to our peer. */ |
1171 | error = sctp_outq_tail(&asoc->outqueue, cmd->obj.ptr); |
1172 | break; |
1173 | |
1174 | case SCTP_CMD_SEND_PKT: |
1175 | /* Send a full packet to our peer. */ |
1176 | packet = cmd->obj.ptr; |
1177 | sctp_packet_transmit(packet); |
1178 | sctp_ootb_pkt_free(packet); |
1179 | break; |
1180 | |
1181 | case SCTP_CMD_RETRAN: |
1182 | /* Mark a transport for retransmission. */ |
1183 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, |
1184 | SCTP_RTXR_T3_RTX); |
1185 | break; |
1186 | |
1187 | case SCTP_CMD_TRANSMIT: |
1188 | /* Kick start transmission. */ |
1189 | error = sctp_outq_uncork(&asoc->outqueue); |
1190 | local_cork = 0; |
1191 | break; |
1192 | |
1193 | case SCTP_CMD_ECN_CE: |
1194 | /* Do delayed CE processing. */ |
1195 | sctp_do_ecn_ce_work(asoc, cmd->obj.u32); |
1196 | break; |
1197 | |
1198 | case SCTP_CMD_ECN_ECNE: |
1199 | /* Do delayed ECNE processing. */ |
1200 | new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32, |
1201 | chunk); |
1202 | if (new_obj) |
1203 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
1204 | SCTP_CHUNK(new_obj)); |
1205 | break; |
1206 | |
1207 | case SCTP_CMD_ECN_CWR: |
1208 | /* Do delayed CWR processing. */ |
1209 | sctp_do_ecn_cwr_work(asoc, cmd->obj.u32); |
1210 | break; |
1211 | |
1212 | case SCTP_CMD_SETUP_T2: |
1213 | sctp_cmd_setup_t2(commands, asoc, cmd->obj.ptr); |
1214 | break; |
1215 | |
1216 | case SCTP_CMD_TIMER_START: |
1217 | timer = &asoc->timers[cmd->obj.to]; |
1218 | timeout = asoc->timeouts[cmd->obj.to]; |
1219 | if (!timeout) |
1220 | BUG(); |
1221 | |
1222 | timer->expires = jiffies + timeout; |
1223 | sctp_association_hold(asoc); |
1224 | add_timer(timer); |
1225 | break; |
1226 | |
1227 | case SCTP_CMD_TIMER_RESTART: |
1228 | timer = &asoc->timers[cmd->obj.to]; |
1229 | timeout = asoc->timeouts[cmd->obj.to]; |
1230 | if (!mod_timer(timer, jiffies + timeout)) |
1231 | sctp_association_hold(asoc); |
1232 | break; |
1233 | |
1234 | case SCTP_CMD_TIMER_STOP: |
1235 | timer = &asoc->timers[cmd->obj.to]; |
1236 | if (timer_pending(timer) && del_timer(timer)) |
1237 | sctp_association_put(asoc); |
1238 | break; |
1239 | |
1240 | case SCTP_CMD_INIT_RESTART: |
1241 | /* Do the needed accounting and updates |
1242 | * associated with restarting an initialization |
1243 | * timer. |
1244 | */ |
1245 | asoc->counters[SCTP_COUNTER_INIT_ERROR]++; |
1246 | asoc->timeouts[cmd->obj.to] *= 2; |
1247 | if (asoc->timeouts[cmd->obj.to] > |
1248 | asoc->max_init_timeo) { |
1249 | asoc->timeouts[cmd->obj.to] = |
1250 | asoc->max_init_timeo; |
1251 | } |
1252 | |
1253 | /* If we've sent any data bundled with |
1254 | * COOKIE-ECHO we need to resend. |
1255 | */ |
1256 | list_for_each(pos, &asoc->peer.transport_addr_list) { |
1257 | t = list_entry(pos, struct sctp_transport, |
1258 | transports); |
1259 | sctp_retransmit_mark(&asoc->outqueue, t, 0); |
1260 | } |
1261 | |
1262 | sctp_add_cmd_sf(commands, |
1263 | SCTP_CMD_TIMER_RESTART, |
1264 | SCTP_TO(cmd->obj.to)); |
1265 | break; |
1266 | |
1267 | case SCTP_CMD_INIT_FAILED: |
1268 | sctp_cmd_init_failed(commands, asoc, cmd->obj.u32); |
1269 | break; |
1270 | |
1271 | case SCTP_CMD_ASSOC_FAILED: |
1272 | sctp_cmd_assoc_failed(commands, asoc, event_type, |
1273 | subtype, chunk, cmd->obj.u32); |
1274 | break; |
1275 | |
1276 | case SCTP_CMD_COUNTER_INC: |
1277 | asoc->counters[cmd->obj.counter]++; |
1278 | break; |
1279 | |
1280 | case SCTP_CMD_COUNTER_RESET: |
1281 | asoc->counters[cmd->obj.counter] = 0; |
1282 | break; |
1283 | |
1284 | case SCTP_CMD_REPORT_DUP: |
1285 | sctp_tsnmap_mark_dup(&asoc->peer.tsn_map, |
1286 | cmd->obj.u32); |
1287 | break; |
1288 | |
1289 | case SCTP_CMD_REPORT_BAD_TAG: |
1290 | SCTP_DEBUG_PRINTK("vtag mismatch!\n"); |
1291 | break; |
1292 | |
1293 | case SCTP_CMD_STRIKE: |
1294 | /* Mark one strike against a transport. */ |
1295 | sctp_do_8_2_transport_strike(asoc, cmd->obj.transport); |
1296 | break; |
1297 | |
1298 | case SCTP_CMD_TRANSPORT_RESET: |
1299 | t = cmd->obj.transport; |
1300 | sctp_cmd_transport_reset(commands, asoc, t); |
1301 | break; |
1302 | |
1303 | case SCTP_CMD_TRANSPORT_ON: |
1304 | t = cmd->obj.transport; |
1305 | sctp_cmd_transport_on(commands, asoc, t, chunk); |
1306 | break; |
1307 | |
1308 | case SCTP_CMD_HB_TIMERS_START: |
1309 | sctp_cmd_hb_timers_start(commands, asoc); |
1310 | break; |
1311 | |
1312 | case SCTP_CMD_HB_TIMER_UPDATE: |
1313 | t = cmd->obj.transport; |
1314 | sctp_cmd_hb_timer_update(commands, asoc, t); |
1315 | break; |
1316 | |
1317 | case SCTP_CMD_HB_TIMERS_STOP: |
1318 | sctp_cmd_hb_timers_stop(commands, asoc); |
1319 | break; |
1320 | |
1321 | case SCTP_CMD_REPORT_ERROR: |
1322 | error = cmd->obj.error; |
1323 | break; |
1324 | |
1325 | case SCTP_CMD_PROCESS_CTSN: |
1326 | /* Dummy up a SACK for processing. */ |
1327 | sackh.cum_tsn_ack = cmd->obj.u32; |
1328 | sackh.a_rwnd = 0; |
1329 | sackh.num_gap_ack_blocks = 0; |
1330 | sackh.num_dup_tsns = 0; |
1331 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, |
1332 | SCTP_SACKH(&sackh)); |
1333 | break; |
1334 | |
1335 | case SCTP_CMD_DISCARD_PACKET: |
1336 | /* We need to discard the whole packet. */ |
1337 | chunk->pdiscard = 1; |
1338 | break; |
1339 | |
1340 | case SCTP_CMD_RTO_PENDING: |
1341 | t = cmd->obj.transport; |
1342 | t->rto_pending = 1; |
1343 | break; |
1344 | |
1345 | case SCTP_CMD_PART_DELIVER: |
1346 | sctp_ulpq_partial_delivery(&asoc->ulpq, cmd->obj.ptr, |
1347 | GFP_ATOMIC); |
1348 | break; |
1349 | |
1350 | case SCTP_CMD_RENEGE: |
1351 | sctp_ulpq_renege(&asoc->ulpq, cmd->obj.ptr, |
1352 | GFP_ATOMIC); |
1353 | break; |
1354 | |
1355 | case SCTP_CMD_SETUP_T4: |
1356 | sctp_cmd_setup_t4(commands, asoc, cmd->obj.ptr); |
1357 | break; |
1358 | |
1359 | case SCTP_CMD_PROCESS_OPERR: |
1360 | sctp_cmd_process_operr(commands, asoc, chunk); |
1361 | break; |
1362 | case SCTP_CMD_CLEAR_INIT_TAG: |
1363 | asoc->peer.i.init_tag = 0; |
1364 | break; |
1365 | case SCTP_CMD_DEL_NON_PRIMARY: |
1366 | sctp_cmd_del_non_primary(asoc); |
1367 | break; |
1368 | case SCTP_CMD_T3_RTX_TIMERS_STOP: |
1369 | sctp_cmd_t3_rtx_timers_stop(commands, asoc); |
1370 | break; |
1371 | case SCTP_CMD_FORCE_PRIM_RETRAN: |
1372 | t = asoc->peer.retran_path; |
1373 | asoc->peer.retran_path = asoc->peer.primary_path; |
1374 | error = sctp_outq_uncork(&asoc->outqueue); |
1375 | local_cork = 0; |
1376 | asoc->peer.retran_path = t; |
1377 | break; |
1378 | default: |
1379 | printk(KERN_WARNING "Impossible command: %u, %p\n", |
1380 | cmd->verb, cmd->obj.ptr); |
1381 | break; |
1382 | }; |
1383 | if (error) |
1384 | break; |
1385 | } |
1386 | |
1387 | out: |
1388 | if (local_cork) |
1389 | sctp_outq_uncork(&asoc->outqueue); |
1390 | return error; |
1391 | nomem: |
1392 | error = -ENOMEM; |
1393 | goto out; |
1394 | } |
1395 |