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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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
58static 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,
Al Virodd0fc662005-10-07 07:46:04 +010066 gfp_t gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067static 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,
Al Virodd0fc662005-10-07 07:46:04 +010074 gfp_t gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76/********************************************************************
77 * Helper functions
78 ********************************************************************/
79
80/* A helper function for delayed processing of INET ECN CE bit. */
81static 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 */
102static 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. */
145static 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. */
155static 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 }
208out:
209 return error;
210nomem:
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 */
218void 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
252out_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 */
260static 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
292out_unlock:
293 sctp_bh_unlock_sock(asoc->base.sk);
294 sctp_association_put(asoc);
295}
296
297static 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
303static 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
309static 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
315static 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
321static 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
329static 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 */
338void 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
368out_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. */
374static 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
380sctp_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 */
409static 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
Frank Filz3f7a87d2005-06-20 13:14:57 -0700417 if (transport->state != SCTP_INACTIVE &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 (transport->error_count++ >= transport->max_retrans)) {
Frank Filz3f7a87d2005-06-20 13:14:57 -0700419 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
420 " transport IP: port:%d failed.\n",
421 asoc,
422 (&transport->ipaddr),
423 transport->ipaddr.v4.sin_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 sctp_assoc_control_transport(asoc, transport,
425 SCTP_TRANSPORT_DOWN,
426 SCTP_FAILED_THRESHOLD);
427 }
428
429 /* E2) For the destination address for which the timer
430 * expires, set RTO <- RTO * 2 ("back off the timer"). The
431 * maximum value discussed in rule C7 above (RTO.max) may be
432 * used to provide an upper bound to this doubling operation.
433 */
434 transport->rto = min((transport->rto * 2), transport->asoc->rto_max);
435}
436
437/* Worker routine to handle INIT command failure. */
438static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands,
439 struct sctp_association *asoc,
440 unsigned error)
441{
442 struct sctp_ulpevent *event;
443
444 event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC,
445 (__u16)error, 0, 0,
446 GFP_ATOMIC);
447
448 if (event)
449 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
450 SCTP_ULPEVENT(event));
451
452 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
453 SCTP_STATE(SCTP_STATE_CLOSED));
454
455 /* SEND_FAILED sent later when cleaning up the association. */
456 asoc->outqueue.error = error;
457 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
458}
459
460/* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
461static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands,
462 struct sctp_association *asoc,
463 sctp_event_t event_type,
464 sctp_subtype_t subtype,
465 struct sctp_chunk *chunk,
466 unsigned error)
467{
468 struct sctp_ulpevent *event;
469
470 /* Cancel any partial delivery in progress. */
471 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
472
473 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
474 (__u16)error, 0, 0,
475 GFP_ATOMIC);
476 if (event)
477 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
478 SCTP_ULPEVENT(event));
479
480 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
481 SCTP_STATE(SCTP_STATE_CLOSED));
482
483 /* Set sk_err to ECONNRESET on a 1-1 style socket. */
484 if (!sctp_style(asoc->base.sk, UDP))
485 asoc->base.sk->sk_err = ECONNRESET;
486
487 /* SEND_FAILED sent later when cleaning up the association. */
488 asoc->outqueue.error = error;
489 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
490}
491
492/* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
493 * inside the cookie. In reality, this is only used for INIT-ACK processing
494 * since all other cases use "temporary" associations and can do all
495 * their work in statefuns directly.
496 */
497static int sctp_cmd_process_init(sctp_cmd_seq_t *commands,
498 struct sctp_association *asoc,
499 struct sctp_chunk *chunk,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -0700500 sctp_init_chunk_t *peer_init,
Al Virodd0fc662005-10-07 07:46:04 +0100501 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502{
503 int error;
504
505 /* We only process the init as a sideeffect in a single
506 * case. This is when we process the INIT-ACK. If we
507 * fail during INIT processing (due to malloc problems),
508 * just return the error and stop processing the stack.
509 */
510 if (!sctp_process_init(asoc, chunk->chunk_hdr->type,
511 sctp_source(chunk), peer_init, gfp))
512 error = -ENOMEM;
513 else
514 error = 0;
515
516 return error;
517}
518
519/* Helper function to break out starting up of heartbeat timers. */
520static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds,
521 struct sctp_association *asoc)
522{
523 struct sctp_transport *t;
524 struct list_head *pos;
525
526 /* Start a heartbeat timer for each transport on the association.
527 * hold a reference on the transport to make sure none of
528 * the needed data structures go away.
529 */
530 list_for_each(pos, &asoc->peer.transport_addr_list) {
531 t = list_entry(pos, struct sctp_transport, transports);
532
533 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
534 sctp_transport_hold(t);
535 }
536}
537
538static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds,
539 struct sctp_association *asoc)
540{
541 struct sctp_transport *t;
542 struct list_head *pos;
543
544 /* Stop all heartbeat timers. */
545
546 list_for_each(pos, &asoc->peer.transport_addr_list) {
547 t = list_entry(pos, struct sctp_transport, transports);
548 if (del_timer(&t->hb_timer))
549 sctp_transport_put(t);
550 }
551}
552
553/* Helper function to stop any pending T3-RTX timers */
554static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds,
555 struct sctp_association *asoc)
556{
557 struct sctp_transport *t;
558 struct list_head *pos;
559
560 list_for_each(pos, &asoc->peer.transport_addr_list) {
561 t = list_entry(pos, struct sctp_transport, transports);
562 if (timer_pending(&t->T3_rtx_timer) &&
563 del_timer(&t->T3_rtx_timer)) {
564 sctp_transport_put(t);
565 }
566 }
567}
568
569
570/* Helper function to update the heartbeat timer. */
571static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds,
572 struct sctp_association *asoc,
573 struct sctp_transport *t)
574{
575 /* Update the heartbeat timer. */
576 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
577 sctp_transport_hold(t);
578}
579
580/* Helper function to handle the reception of an HEARTBEAT ACK. */
581static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
582 struct sctp_association *asoc,
583 struct sctp_transport *t,
584 struct sctp_chunk *chunk)
585{
586 sctp_sender_hb_info_t *hbinfo;
587
588 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
589 * HEARTBEAT should clear the error counter of the destination
590 * transport address to which the HEARTBEAT was sent.
591 * The association's overall error count is also cleared.
592 */
593 t->error_count = 0;
594 t->asoc->overall_error_count = 0;
595
596 /* Mark the destination transport address as active if it is not so
597 * marked.
598 */
Frank Filz3f7a87d2005-06-20 13:14:57 -0700599 if (t->state == SCTP_INACTIVE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
601 SCTP_HEARTBEAT_SUCCESS);
602
603 /* The receiver of the HEARTBEAT ACK should also perform an
604 * RTT measurement for that destination transport address
605 * using the time value carried in the HEARTBEAT ACK chunk.
606 */
607 hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data;
608 sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at));
609}
610
611/* Helper function to do a transport reset at the expiry of the hearbeat
612 * timer.
613 */
614static void sctp_cmd_transport_reset(sctp_cmd_seq_t *cmds,
615 struct sctp_association *asoc,
616 struct sctp_transport *t)
617{
618 sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE);
619
620 /* Mark one strike against a transport. */
621 sctp_do_8_2_transport_strike(asoc, t);
622}
623
624/* Helper function to process the process SACK command. */
625static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds,
626 struct sctp_association *asoc,
627 struct sctp_sackhdr *sackh)
628{
629 int err;
630
631 if (sctp_outq_sack(&asoc->outqueue, sackh)) {
632 /* There are no more TSNs awaiting SACK. */
633 err = sctp_do_sm(SCTP_EVENT_T_OTHER,
634 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN),
635 asoc->state, asoc->ep, asoc, NULL,
636 GFP_ATOMIC);
637 } else {
638 /* Windows may have opened, so we need
639 * to check if we have DATA to transmit
640 */
641 err = sctp_outq_flush(&asoc->outqueue, 0);
642 }
643
644 return err;
645}
646
647/* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
648 * the transport for a shutdown chunk.
649 */
650static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds,
651 struct sctp_association *asoc,
652 struct sctp_chunk *chunk)
653{
654 struct sctp_transport *t;
655
656 t = sctp_assoc_choose_shutdown_transport(asoc);
657 asoc->shutdown_last_sent_to = t;
658 asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto;
659 chunk->transport = t;
660}
661
662/* Helper function to change the state of an association. */
663static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds,
664 struct sctp_association *asoc,
665 sctp_state_t state)
666{
667 struct sock *sk = asoc->base.sk;
668
669 asoc->state = state;
670
Frank Filz3f7a87d2005-06-20 13:14:57 -0700671 SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n",
672 asoc, sctp_state_tbl[state]);
673
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 if (sctp_style(sk, TCP)) {
Frank Filz3f7a87d2005-06-20 13:14:57 -0700675 /* Change the sk->sk_state of a TCP-style socket that has
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 * sucessfully completed a connect() call.
677 */
678 if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED))
679 sk->sk_state = SCTP_SS_ESTABLISHED;
680
681 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
682 if (sctp_state(asoc, SHUTDOWN_RECEIVED) &&
683 sctp_sstate(sk, ESTABLISHED))
684 sk->sk_shutdown |= RCV_SHUTDOWN;
685 }
686
Frank Filz3f7a87d2005-06-20 13:14:57 -0700687 if (sctp_state(asoc, COOKIE_WAIT)) {
688 /* Reset init timeouts since they may have been
689 * increased due to timer expirations.
690 */
691 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
692 asoc->ep->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT];
693 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
694 asoc->ep->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE];
695 }
696
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 if (sctp_state(asoc, ESTABLISHED) ||
698 sctp_state(asoc, CLOSED) ||
699 sctp_state(asoc, SHUTDOWN_RECEIVED)) {
700 /* Wake up any processes waiting in the asoc's wait queue in
701 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
702 */
703 if (waitqueue_active(&asoc->wait))
704 wake_up_interruptible(&asoc->wait);
705
706 /* Wake up any processes waiting in the sk's sleep queue of
707 * a TCP-style or UDP-style peeled-off socket in
708 * sctp_wait_for_accept() or sctp_wait_for_packet().
709 * For a UDP-style socket, the waiters are woken up by the
710 * notifications.
711 */
712 if (!sctp_style(sk, UDP))
713 sk->sk_state_change(sk);
714 }
715}
716
717/* Helper function to delete an association. */
718static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds,
719 struct sctp_association *asoc)
720{
721 struct sock *sk = asoc->base.sk;
722
723 /* If it is a non-temporary association belonging to a TCP-style
724 * listening socket that is not closed, do not free it so that accept()
725 * can pick it up later.
726 */
727 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) &&
728 (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK))
729 return;
730
731 sctp_unhash_established(asoc);
732 sctp_association_free(asoc);
733}
734
735/*
736 * ADDIP Section 4.1 ASCONF Chunk Procedures
737 * A4) Start a T-4 RTO timer, using the RTO value of the selected
738 * destination address (we use active path instead of primary path just
739 * because primary path may be inactive.
740 */
741static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds,
742 struct sctp_association *asoc,
743 struct sctp_chunk *chunk)
744{
745 struct sctp_transport *t;
746
747 t = asoc->peer.active_path;
748 asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto;
749 chunk->transport = t;
750}
751
752/* Process an incoming Operation Error Chunk. */
753static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds,
754 struct sctp_association *asoc,
755 struct sctp_chunk *chunk)
756{
757 struct sctp_operr_chunk *operr_chunk;
758 struct sctp_errhdr *err_hdr;
759
760 operr_chunk = (struct sctp_operr_chunk *)chunk->chunk_hdr;
761 err_hdr = &operr_chunk->err_hdr;
762
763 switch (err_hdr->cause) {
764 case SCTP_ERROR_UNKNOWN_CHUNK:
765 {
766 struct sctp_chunkhdr *unk_chunk_hdr;
767
768 unk_chunk_hdr = (struct sctp_chunkhdr *)err_hdr->variable;
769 switch (unk_chunk_hdr->type) {
770 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with an
771 * ERROR chunk reporting that it did not recognized the ASCONF
772 * chunk type, the sender of the ASCONF MUST NOT send any
773 * further ASCONF chunks and MUST stop its T-4 timer.
774 */
775 case SCTP_CID_ASCONF:
776 asoc->peer.asconf_capable = 0;
777 sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP,
778 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO));
779 break;
780 default:
781 break;
782 }
783 break;
784 }
785 default:
786 break;
787 }
788}
789
790/* Process variable FWDTSN chunk information. */
791static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq,
792 struct sctp_chunk *chunk)
793{
794 struct sctp_fwdtsn_skip *skip;
795 /* Walk through all the skipped SSNs */
796 sctp_walk_fwdtsn(skip, chunk) {
797 sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn));
798 }
799
800 return;
801}
802
803/* Helper function to remove the association non-primary peer
804 * transports.
805 */
806static void sctp_cmd_del_non_primary(struct sctp_association *asoc)
807{
808 struct sctp_transport *t;
809 struct list_head *pos;
810 struct list_head *temp;
811
812 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
813 t = list_entry(pos, struct sctp_transport, transports);
814 if (!sctp_cmp_addr_exact(&t->ipaddr,
815 &asoc->peer.primary_addr)) {
816 sctp_assoc_del_peer(asoc, &t->ipaddr);
817 }
818 }
819
820 return;
821}
822
823/* These three macros allow us to pull the debugging code out of the
824 * main flow of sctp_do_sm() to keep attention focused on the real
825 * functionality there.
826 */
827#define DEBUG_PRE \
828 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
829 "ep %p, %s, %s, asoc %p[%s], %s\n", \
830 ep, sctp_evttype_tbl[event_type], \
831 (*debug_fn)(subtype), asoc, \
832 sctp_state_tbl[state], state_fn->name)
833
834#define DEBUG_POST \
835 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
836 "asoc %p, status: %s\n", \
837 asoc, sctp_status_tbl[status])
838
839#define DEBUG_POST_SFX \
840 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
841 error, asoc, \
842 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
843 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
844
845/*
846 * This is the master state machine processing function.
847 *
848 * If you want to understand all of lksctp, this is a
849 * good place to start.
850 */
851int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype,
852 sctp_state_t state,
853 struct sctp_endpoint *ep,
854 struct sctp_association *asoc,
855 void *event_arg,
Al Virodd0fc662005-10-07 07:46:04 +0100856 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857{
858 sctp_cmd_seq_t commands;
859 const sctp_sm_table_entry_t *state_fn;
860 sctp_disposition_t status;
861 int error = 0;
862 typedef const char *(printfn_t)(sctp_subtype_t);
863
864 static printfn_t *table[] = {
865 NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname,
866 };
867 printfn_t *debug_fn __attribute__ ((unused)) = table[event_type];
868
869 /* Look up the state function, run it, and then process the
870 * side effects. These three steps are the heart of lksctp.
871 */
872 state_fn = sctp_sm_lookup_event(event_type, state, subtype);
873
874 sctp_init_cmd_seq(&commands);
875
876 DEBUG_PRE;
877 status = (*state_fn->fn)(ep, asoc, subtype, event_arg, &commands);
878 DEBUG_POST;
879
880 error = sctp_side_effects(event_type, subtype, state,
881 ep, asoc, event_arg, status,
882 &commands, gfp);
883 DEBUG_POST_SFX;
884
885 return error;
886}
887
888#undef DEBUG_PRE
889#undef DEBUG_POST
890
891/*****************************************************************
892 * This the master state function side effect processing function.
893 *****************************************************************/
894static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
895 sctp_state_t state,
896 struct sctp_endpoint *ep,
897 struct sctp_association *asoc,
898 void *event_arg,
899 sctp_disposition_t status,
900 sctp_cmd_seq_t *commands,
Al Virodd0fc662005-10-07 07:46:04 +0100901 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902{
903 int error;
904
905 /* FIXME - Most of the dispositions left today would be categorized
906 * as "exceptional" dispositions. For those dispositions, it
907 * may not be proper to run through any of the commands at all.
908 * For example, the command interpreter might be run only with
909 * disposition SCTP_DISPOSITION_CONSUME.
910 */
911 if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state,
912 ep, asoc,
913 event_arg, status,
914 commands, gfp)))
915 goto bail;
916
917 switch (status) {
918 case SCTP_DISPOSITION_DISCARD:
919 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
920 "event_type %d, event_id %d\n",
921 state, event_type, subtype.chunk);
922 break;
923
924 case SCTP_DISPOSITION_NOMEM:
925 /* We ran out of memory, so we need to discard this
926 * packet.
927 */
928 /* BUG--we should now recover some memory, probably by
929 * reneging...
930 */
931 error = -ENOMEM;
932 break;
933
934 case SCTP_DISPOSITION_DELETE_TCB:
935 /* This should now be a command. */
936 break;
937
938 case SCTP_DISPOSITION_CONSUME:
939 case SCTP_DISPOSITION_ABORT:
940 /*
941 * We should no longer have much work to do here as the
942 * real work has been done as explicit commands above.
943 */
944 break;
945
946 case SCTP_DISPOSITION_VIOLATION:
947 printk(KERN_ERR "sctp protocol violation state %d "
948 "chunkid %d\n", state, subtype.chunk);
949 break;
950
951 case SCTP_DISPOSITION_NOT_IMPL:
952 printk(KERN_WARNING "sctp unimplemented feature in state %d, "
953 "event_type %d, event_id %d\n",
954 state, event_type, subtype.chunk);
955 break;
956
957 case SCTP_DISPOSITION_BUG:
958 printk(KERN_ERR "sctp bug in state %d, "
959 "event_type %d, event_id %d\n",
960 state, event_type, subtype.chunk);
961 BUG();
962 break;
963
964 default:
965 printk(KERN_ERR "sctp impossible disposition %d "
966 "in state %d, event_type %d, event_id %d\n",
967 status, state, event_type, subtype.chunk);
968 BUG();
969 break;
970 };
971
972bail:
973 return error;
974}
975
976/********************************************************************
977 * 2nd Level Abstractions
978 ********************************************************************/
979
980/* This is the side-effect interpreter. */
981static int sctp_cmd_interpreter(sctp_event_t event_type,
982 sctp_subtype_t subtype,
983 sctp_state_t state,
984 struct sctp_endpoint *ep,
985 struct sctp_association *asoc,
986 void *event_arg,
987 sctp_disposition_t status,
988 sctp_cmd_seq_t *commands,
Al Virodd0fc662005-10-07 07:46:04 +0100989 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990{
991 int error = 0;
992 int force;
993 sctp_cmd_t *cmd;
994 struct sctp_chunk *new_obj;
995 struct sctp_chunk *chunk = NULL;
996 struct sctp_packet *packet;
997 struct list_head *pos;
998 struct timer_list *timer;
999 unsigned long timeout;
1000 struct sctp_transport *t;
1001 struct sctp_sackhdr sackh;
1002 int local_cork = 0;
1003
1004 if (SCTP_EVENT_T_TIMEOUT != event_type)
1005 chunk = (struct sctp_chunk *) event_arg;
1006
1007 /* Note: This whole file is a huge candidate for rework.
1008 * For example, each command could either have its own handler, so
1009 * the loop would look like:
1010 * while (cmds)
1011 * cmd->handle(x, y, z)
1012 * --jgrimm
1013 */
1014 while (NULL != (cmd = sctp_next_cmd(commands))) {
1015 switch (cmd->verb) {
1016 case SCTP_CMD_NOP:
1017 /* Do nothing. */
1018 break;
1019
1020 case SCTP_CMD_NEW_ASOC:
1021 /* Register a new association. */
1022 if (local_cork) {
1023 sctp_outq_uncork(&asoc->outqueue);
1024 local_cork = 0;
1025 }
1026 asoc = cmd->obj.ptr;
1027 /* Register with the endpoint. */
1028 sctp_endpoint_add_asoc(ep, asoc);
1029 sctp_hash_established(asoc);
1030 break;
1031
1032 case SCTP_CMD_UPDATE_ASSOC:
1033 sctp_assoc_update(asoc, cmd->obj.ptr);
1034 break;
1035
1036 case SCTP_CMD_PURGE_OUTQUEUE:
1037 sctp_outq_teardown(&asoc->outqueue);
1038 break;
1039
1040 case SCTP_CMD_DELETE_TCB:
1041 if (local_cork) {
1042 sctp_outq_uncork(&asoc->outqueue);
1043 local_cork = 0;
1044 }
1045 /* Delete the current association. */
1046 sctp_cmd_delete_tcb(commands, asoc);
1047 asoc = NULL;
1048 break;
1049
1050 case SCTP_CMD_NEW_STATE:
1051 /* Enter a new state. */
1052 sctp_cmd_new_state(commands, asoc, cmd->obj.state);
1053 break;
1054
1055 case SCTP_CMD_REPORT_TSN:
1056 /* Record the arrival of a TSN. */
1057 sctp_tsnmap_mark(&asoc->peer.tsn_map, cmd->obj.u32);
1058 break;
1059
1060 case SCTP_CMD_REPORT_FWDTSN:
1061 /* Move the Cumulattive TSN Ack ahead. */
1062 sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32);
1063
1064 /* Abort any in progress partial delivery. */
1065 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
1066 break;
1067
1068 case SCTP_CMD_PROCESS_FWDTSN:
1069 sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.ptr);
1070 break;
1071
1072 case SCTP_CMD_GEN_SACK:
1073 /* Generate a Selective ACK.
1074 * The argument tells us whether to just count
1075 * the packet and MAYBE generate a SACK, or
1076 * force a SACK out.
1077 */
1078 force = cmd->obj.i32;
1079 error = sctp_gen_sack(asoc, force, commands);
1080 break;
1081
1082 case SCTP_CMD_PROCESS_SACK:
1083 /* Process an inbound SACK. */
1084 error = sctp_cmd_process_sack(commands, asoc,
1085 cmd->obj.ptr);
1086 break;
1087
1088 case SCTP_CMD_GEN_INIT_ACK:
1089 /* Generate an INIT ACK chunk. */
1090 new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC,
1091 0);
1092 if (!new_obj)
1093 goto nomem;
1094
1095 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1096 SCTP_CHUNK(new_obj));
1097 break;
1098
1099 case SCTP_CMD_PEER_INIT:
1100 /* Process a unified INIT from the peer.
1101 * Note: Only used during INIT-ACK processing. If
1102 * there is an error just return to the outter
1103 * layer which will bail.
1104 */
1105 error = sctp_cmd_process_init(commands, asoc, chunk,
1106 cmd->obj.ptr, gfp);
1107 break;
1108
1109 case SCTP_CMD_GEN_COOKIE_ECHO:
1110 /* Generate a COOKIE ECHO chunk. */
1111 new_obj = sctp_make_cookie_echo(asoc, chunk);
1112 if (!new_obj) {
1113 if (cmd->obj.ptr)
1114 sctp_chunk_free(cmd->obj.ptr);
1115 goto nomem;
1116 }
1117 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1118 SCTP_CHUNK(new_obj));
1119
1120 /* If there is an ERROR chunk to be sent along with
1121 * the COOKIE_ECHO, send it, too.
1122 */
1123 if (cmd->obj.ptr)
1124 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1125 SCTP_CHUNK(cmd->obj.ptr));
1126
1127 /* FIXME - Eventually come up with a cleaner way to
1128 * enabling COOKIE-ECHO + DATA bundling during
1129 * multihoming stale cookie scenarios, the following
1130 * command plays with asoc->peer.retran_path to
1131 * avoid the problem of sending the COOKIE-ECHO and
1132 * DATA in different paths, which could result
1133 * in the association being ABORTed if the DATA chunk
1134 * is processed first by the server. Checking the
1135 * init error counter simply causes this command
1136 * to be executed only during failed attempts of
1137 * association establishment.
1138 */
Frank Filz3f7a87d2005-06-20 13:14:57 -07001139 if ((asoc->peer.retran_path !=
1140 asoc->peer.primary_path) &&
1141 (asoc->init_err_counter > 0)) {
1142 sctp_add_cmd_sf(commands,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 SCTP_CMD_FORCE_PRIM_RETRAN,
1144 SCTP_NULL());
1145 }
1146
1147 break;
1148
1149 case SCTP_CMD_GEN_SHUTDOWN:
1150 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1151 * Reset error counts.
1152 */
1153 asoc->overall_error_count = 0;
1154
1155 /* Generate a SHUTDOWN chunk. */
1156 new_obj = sctp_make_shutdown(asoc, chunk);
1157 if (!new_obj)
1158 goto nomem;
1159 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1160 SCTP_CHUNK(new_obj));
1161 break;
1162
1163 case SCTP_CMD_CHUNK_ULP:
1164 /* Send a chunk to the sockets layer. */
1165 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1166 "chunk_up:", cmd->obj.ptr,
1167 "ulpq:", &asoc->ulpq);
1168 sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.ptr,
1169 GFP_ATOMIC);
1170 break;
1171
1172 case SCTP_CMD_EVENT_ULP:
1173 /* Send a notification to the sockets layer. */
1174 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1175 "event_up:",cmd->obj.ptr,
1176 "ulpq:",&asoc->ulpq);
1177 sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ptr);
1178 break;
1179
1180 case SCTP_CMD_REPLY:
1181 /* If an caller has not already corked, do cork. */
1182 if (!asoc->outqueue.cork) {
1183 sctp_outq_cork(&asoc->outqueue);
1184 local_cork = 1;
1185 }
1186 /* Send a chunk to our peer. */
1187 error = sctp_outq_tail(&asoc->outqueue, cmd->obj.ptr);
1188 break;
1189
1190 case SCTP_CMD_SEND_PKT:
1191 /* Send a full packet to our peer. */
1192 packet = cmd->obj.ptr;
1193 sctp_packet_transmit(packet);
1194 sctp_ootb_pkt_free(packet);
1195 break;
1196
1197 case SCTP_CMD_RETRAN:
1198 /* Mark a transport for retransmission. */
1199 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1200 SCTP_RTXR_T3_RTX);
1201 break;
1202
1203 case SCTP_CMD_TRANSMIT:
1204 /* Kick start transmission. */
1205 error = sctp_outq_uncork(&asoc->outqueue);
1206 local_cork = 0;
1207 break;
1208
1209 case SCTP_CMD_ECN_CE:
1210 /* Do delayed CE processing. */
1211 sctp_do_ecn_ce_work(asoc, cmd->obj.u32);
1212 break;
1213
1214 case SCTP_CMD_ECN_ECNE:
1215 /* Do delayed ECNE processing. */
1216 new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32,
1217 chunk);
1218 if (new_obj)
1219 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1220 SCTP_CHUNK(new_obj));
1221 break;
1222
1223 case SCTP_CMD_ECN_CWR:
1224 /* Do delayed CWR processing. */
1225 sctp_do_ecn_cwr_work(asoc, cmd->obj.u32);
1226 break;
1227
1228 case SCTP_CMD_SETUP_T2:
1229 sctp_cmd_setup_t2(commands, asoc, cmd->obj.ptr);
1230 break;
1231
1232 case SCTP_CMD_TIMER_START:
1233 timer = &asoc->timers[cmd->obj.to];
1234 timeout = asoc->timeouts[cmd->obj.to];
1235 if (!timeout)
1236 BUG();
1237
1238 timer->expires = jiffies + timeout;
1239 sctp_association_hold(asoc);
1240 add_timer(timer);
1241 break;
1242
1243 case SCTP_CMD_TIMER_RESTART:
1244 timer = &asoc->timers[cmd->obj.to];
1245 timeout = asoc->timeouts[cmd->obj.to];
1246 if (!mod_timer(timer, jiffies + timeout))
1247 sctp_association_hold(asoc);
1248 break;
1249
1250 case SCTP_CMD_TIMER_STOP:
1251 timer = &asoc->timers[cmd->obj.to];
1252 if (timer_pending(timer) && del_timer(timer))
1253 sctp_association_put(asoc);
1254 break;
1255
Frank Filz3f7a87d2005-06-20 13:14:57 -07001256 case SCTP_CMD_INIT_CHOOSE_TRANSPORT:
1257 chunk = cmd->obj.ptr;
1258 t = sctp_assoc_choose_init_transport(asoc);
1259 asoc->init_last_sent_to = t;
1260 chunk->transport = t;
1261 t->init_sent_count++;
1262 break;
1263
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 case SCTP_CMD_INIT_RESTART:
1265 /* Do the needed accounting and updates
1266 * associated with restarting an initialization
Frank Filz3f7a87d2005-06-20 13:14:57 -07001267 * timer. Only multiply the timeout by two if
1268 * all transports have been tried at the current
1269 * timeout.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 */
Frank Filz3f7a87d2005-06-20 13:14:57 -07001271 t = asoc->init_last_sent_to;
1272 asoc->init_err_counter++;
1273
1274 if (t->init_sent_count > (asoc->init_cycle + 1)) {
1275 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] *= 2;
1276 if (asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] >
1277 asoc->max_init_timeo) {
1278 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
1279 asoc->max_init_timeo;
1280 }
1281 asoc->init_cycle++;
1282 SCTP_DEBUG_PRINTK(
1283 "T1 INIT Timeout adjustment"
1284 " init_err_counter: %d"
1285 " cycle: %d"
1286 " timeout: %d\n",
1287 asoc->init_err_counter,
1288 asoc->init_cycle,
1289 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT]);
1290 }
1291
1292 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
1293 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
1294 break;
1295
1296 case SCTP_CMD_COOKIEECHO_RESTART:
1297 /* Do the needed accounting and updates
1298 * associated with restarting an initialization
1299 * timer. Only multiply the timeout by two if
1300 * all transports have been tried at the current
1301 * timeout.
1302 */
1303 asoc->init_err_counter++;
1304
1305 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] *= 2;
1306 if (asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] >
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 asoc->max_init_timeo) {
Frank Filz3f7a87d2005-06-20 13:14:57 -07001308 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 asoc->max_init_timeo;
1310 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07001311 SCTP_DEBUG_PRINTK(
1312 "T1 COOKIE Timeout adjustment"
1313 " init_err_counter: %d"
1314 " timeout: %d\n",
1315 asoc->init_err_counter,
1316 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317
1318 /* If we've sent any data bundled with
1319 * COOKIE-ECHO we need to resend.
1320 */
1321 list_for_each(pos, &asoc->peer.transport_addr_list) {
1322 t = list_entry(pos, struct sctp_transport,
1323 transports);
1324 sctp_retransmit_mark(&asoc->outqueue, t, 0);
1325 }
1326
1327 sctp_add_cmd_sf(commands,
1328 SCTP_CMD_TIMER_RESTART,
Frank Filz3f7a87d2005-06-20 13:14:57 -07001329 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 break;
1331
1332 case SCTP_CMD_INIT_FAILED:
1333 sctp_cmd_init_failed(commands, asoc, cmd->obj.u32);
1334 break;
1335
1336 case SCTP_CMD_ASSOC_FAILED:
1337 sctp_cmd_assoc_failed(commands, asoc, event_type,
1338 subtype, chunk, cmd->obj.u32);
1339 break;
1340
Frank Filz3f7a87d2005-06-20 13:14:57 -07001341 case SCTP_CMD_INIT_COUNTER_INC:
1342 asoc->init_err_counter++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 break;
1344
Frank Filz3f7a87d2005-06-20 13:14:57 -07001345 case SCTP_CMD_INIT_COUNTER_RESET:
1346 asoc->init_err_counter = 0;
1347 asoc->init_cycle = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 break;
1349
1350 case SCTP_CMD_REPORT_DUP:
1351 sctp_tsnmap_mark_dup(&asoc->peer.tsn_map,
1352 cmd->obj.u32);
1353 break;
1354
1355 case SCTP_CMD_REPORT_BAD_TAG:
1356 SCTP_DEBUG_PRINTK("vtag mismatch!\n");
1357 break;
1358
1359 case SCTP_CMD_STRIKE:
1360 /* Mark one strike against a transport. */
1361 sctp_do_8_2_transport_strike(asoc, cmd->obj.transport);
1362 break;
1363
1364 case SCTP_CMD_TRANSPORT_RESET:
1365 t = cmd->obj.transport;
1366 sctp_cmd_transport_reset(commands, asoc, t);
1367 break;
1368
1369 case SCTP_CMD_TRANSPORT_ON:
1370 t = cmd->obj.transport;
1371 sctp_cmd_transport_on(commands, asoc, t, chunk);
1372 break;
1373
1374 case SCTP_CMD_HB_TIMERS_START:
1375 sctp_cmd_hb_timers_start(commands, asoc);
1376 break;
1377
1378 case SCTP_CMD_HB_TIMER_UPDATE:
1379 t = cmd->obj.transport;
1380 sctp_cmd_hb_timer_update(commands, asoc, t);
1381 break;
1382
1383 case SCTP_CMD_HB_TIMERS_STOP:
1384 sctp_cmd_hb_timers_stop(commands, asoc);
1385 break;
1386
1387 case SCTP_CMD_REPORT_ERROR:
1388 error = cmd->obj.error;
1389 break;
1390
1391 case SCTP_CMD_PROCESS_CTSN:
1392 /* Dummy up a SACK for processing. */
1393 sackh.cum_tsn_ack = cmd->obj.u32;
1394 sackh.a_rwnd = 0;
1395 sackh.num_gap_ack_blocks = 0;
1396 sackh.num_dup_tsns = 0;
1397 sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK,
1398 SCTP_SACKH(&sackh));
1399 break;
1400
1401 case SCTP_CMD_DISCARD_PACKET:
1402 /* We need to discard the whole packet. */
1403 chunk->pdiscard = 1;
1404 break;
1405
1406 case SCTP_CMD_RTO_PENDING:
1407 t = cmd->obj.transport;
1408 t->rto_pending = 1;
1409 break;
1410
1411 case SCTP_CMD_PART_DELIVER:
1412 sctp_ulpq_partial_delivery(&asoc->ulpq, cmd->obj.ptr,
1413 GFP_ATOMIC);
1414 break;
1415
1416 case SCTP_CMD_RENEGE:
1417 sctp_ulpq_renege(&asoc->ulpq, cmd->obj.ptr,
1418 GFP_ATOMIC);
1419 break;
1420
1421 case SCTP_CMD_SETUP_T4:
1422 sctp_cmd_setup_t4(commands, asoc, cmd->obj.ptr);
1423 break;
1424
1425 case SCTP_CMD_PROCESS_OPERR:
1426 sctp_cmd_process_operr(commands, asoc, chunk);
1427 break;
1428 case SCTP_CMD_CLEAR_INIT_TAG:
1429 asoc->peer.i.init_tag = 0;
1430 break;
1431 case SCTP_CMD_DEL_NON_PRIMARY:
1432 sctp_cmd_del_non_primary(asoc);
1433 break;
1434 case SCTP_CMD_T3_RTX_TIMERS_STOP:
1435 sctp_cmd_t3_rtx_timers_stop(commands, asoc);
1436 break;
1437 case SCTP_CMD_FORCE_PRIM_RETRAN:
1438 t = asoc->peer.retran_path;
1439 asoc->peer.retran_path = asoc->peer.primary_path;
1440 error = sctp_outq_uncork(&asoc->outqueue);
1441 local_cork = 0;
1442 asoc->peer.retran_path = t;
1443 break;
1444 default:
1445 printk(KERN_WARNING "Impossible command: %u, %p\n",
1446 cmd->verb, cmd->obj.ptr);
1447 break;
1448 };
1449 if (error)
1450 break;
1451 }
1452
1453out:
1454 if (local_cork)
1455 sctp_outq_uncork(&asoc->outqueue);
1456 return error;
1457nomem:
1458 error = -ENOMEM;
1459 goto out;
1460}
1461