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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 gfp_t 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 gfp_t 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 struct sctp_transport *trans = asoc->peer.last_data_from;
161 int error = 0;
162
163 if (force ||
164 (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) ||
165 (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE)))
166 asoc->peer.sack_needed = 1;
167
168 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
169 max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
170
171 /* From 12.2 Parameters necessary per association (i.e. the TCB):
172 *
173 * Ack State : This flag indicates if the next received packet
174 * : is to be responded to with a SACK. ...
175 * : When DATA chunks are out of order, SACK's
176 * : are not delayed (see Section 6).
177 *
178 * [This is actually not mentioned in Section 6, but we
179 * implement it here anyway. --piggy]
180 */
181 if (max_tsn_seen != ctsn)
182 asoc->peer.sack_needed = 1;
183
184 /* From 6.2 Acknowledgement on Reception of DATA Chunks:
185 *
186 * Section 4.2 of [RFC2581] SHOULD be followed. Specifically,
187 * an acknowledgement SHOULD be generated for at least every
188 * second packet (not every second DATA chunk) received, and
189 * SHOULD be generated within 200 ms of the arrival of any
190 * unacknowledged DATA chunk. ...
191 */
192 if (!asoc->peer.sack_needed) {
193 /* We will need a SACK for the next packet. */
194 asoc->peer.sack_needed = 1;
195
196 /* Set the SACK delay timeout based on the
197 * SACK delay for the last transport
198 * data was received from, or the default
199 * for the association.
200 */
201 if (trans)
202 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
203 trans->sackdelay;
204 else
205 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
206 asoc->sackdelay;
207
208 /* Restart the SACK timer. */
209 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
210 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
211 } else {
212 if (asoc->a_rwnd > asoc->rwnd)
213 asoc->a_rwnd = asoc->rwnd;
214 sack = sctp_make_sack(asoc);
215 if (!sack)
216 goto nomem;
217
218 asoc->peer.sack_needed = 0;
219
220 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack));
221
222 /* Stop the SACK timer. */
223 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
224 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
225 }
226
227 return error;
228 nomem:
229 error = -ENOMEM;
230 return error;
231 }
232
233 /* When the T3-RTX timer expires, it calls this function to create the
234 * relevant state machine event.
235 */
236 void sctp_generate_t3_rtx_event(unsigned long peer)
237 {
238 int error;
239 struct sctp_transport *transport = (struct sctp_transport *) peer;
240 struct sctp_association *asoc = transport->asoc;
241
242 /* Check whether a task is in the sock. */
243
244 sctp_bh_lock_sock(asoc->base.sk);
245 if (sock_owned_by_user(asoc->base.sk)) {
246 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __FUNCTION__);
247
248 /* Try again later. */
249 if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20)))
250 sctp_transport_hold(transport);
251 goto out_unlock;
252 }
253
254 /* Is this transport really dead and just waiting around for
255 * the timer to let go of the reference?
256 */
257 if (transport->dead)
258 goto out_unlock;
259
260 /* Run through the state machine. */
261 error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT,
262 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX),
263 asoc->state,
264 asoc->ep, asoc,
265 transport, GFP_ATOMIC);
266
267 if (error)
268 asoc->base.sk->sk_err = -error;
269
270 out_unlock:
271 sctp_bh_unlock_sock(asoc->base.sk);
272 sctp_transport_put(transport);
273 }
274
275 /* This is a sa interface for producing timeout events. It works
276 * for timeouts which use the association as their parameter.
277 */
278 static void sctp_generate_timeout_event(struct sctp_association *asoc,
279 sctp_event_timeout_t timeout_type)
280 {
281 int error = 0;
282
283 sctp_bh_lock_sock(asoc->base.sk);
284 if (sock_owned_by_user(asoc->base.sk)) {
285 SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n",
286 __FUNCTION__,
287 timeout_type);
288
289 /* Try again later. */
290 if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20)))
291 sctp_association_hold(asoc);
292 goto out_unlock;
293 }
294
295 /* Is this association really dead and just waiting around for
296 * the timer to let go of the reference?
297 */
298 if (asoc->base.dead)
299 goto out_unlock;
300
301 /* Run through the state machine. */
302 error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT,
303 SCTP_ST_TIMEOUT(timeout_type),
304 asoc->state, asoc->ep, asoc,
305 (void *)timeout_type, GFP_ATOMIC);
306
307 if (error)
308 asoc->base.sk->sk_err = -error;
309
310 out_unlock:
311 sctp_bh_unlock_sock(asoc->base.sk);
312 sctp_association_put(asoc);
313 }
314
315 static void sctp_generate_t1_cookie_event(unsigned long data)
316 {
317 struct sctp_association *asoc = (struct sctp_association *) data;
318 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE);
319 }
320
321 static void sctp_generate_t1_init_event(unsigned long data)
322 {
323 struct sctp_association *asoc = (struct sctp_association *) data;
324 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT);
325 }
326
327 static void sctp_generate_t2_shutdown_event(unsigned long data)
328 {
329 struct sctp_association *asoc = (struct sctp_association *) data;
330 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN);
331 }
332
333 static void sctp_generate_t4_rto_event(unsigned long data)
334 {
335 struct sctp_association *asoc = (struct sctp_association *) data;
336 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO);
337 }
338
339 static void sctp_generate_t5_shutdown_guard_event(unsigned long data)
340 {
341 struct sctp_association *asoc = (struct sctp_association *)data;
342 sctp_generate_timeout_event(asoc,
343 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD);
344
345 } /* sctp_generate_t5_shutdown_guard_event() */
346
347 static void sctp_generate_autoclose_event(unsigned long data)
348 {
349 struct sctp_association *asoc = (struct sctp_association *) data;
350 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE);
351 }
352
353 /* Generate a heart beat event. If the sock is busy, reschedule. Make
354 * sure that the transport is still valid.
355 */
356 void sctp_generate_heartbeat_event(unsigned long data)
357 {
358 int error = 0;
359 struct sctp_transport *transport = (struct sctp_transport *) data;
360 struct sctp_association *asoc = transport->asoc;
361
362 sctp_bh_lock_sock(asoc->base.sk);
363 if (sock_owned_by_user(asoc->base.sk)) {
364 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __FUNCTION__);
365
366 /* Try again later. */
367 if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20)))
368 sctp_transport_hold(transport);
369 goto out_unlock;
370 }
371
372 /* Is this structure just waiting around for us to actually
373 * get destroyed?
374 */
375 if (transport->dead)
376 goto out_unlock;
377
378 error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT,
379 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT),
380 asoc->state, asoc->ep, asoc,
381 transport, GFP_ATOMIC);
382
383 if (error)
384 asoc->base.sk->sk_err = -error;
385
386 out_unlock:
387 sctp_bh_unlock_sock(asoc->base.sk);
388 sctp_transport_put(transport);
389 }
390
391 /* Inject a SACK Timeout event into the state machine. */
392 static void sctp_generate_sack_event(unsigned long data)
393 {
394 struct sctp_association *asoc = (struct sctp_association *) data;
395 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK);
396 }
397
398 sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = {
399 NULL,
400 sctp_generate_t1_cookie_event,
401 sctp_generate_t1_init_event,
402 sctp_generate_t2_shutdown_event,
403 NULL,
404 sctp_generate_t4_rto_event,
405 sctp_generate_t5_shutdown_guard_event,
406 NULL,
407 sctp_generate_sack_event,
408 sctp_generate_autoclose_event,
409 };
410
411
412 /* RFC 2960 8.2 Path Failure Detection
413 *
414 * When its peer endpoint is multi-homed, an endpoint should keep a
415 * error counter for each of the destination transport addresses of the
416 * peer endpoint.
417 *
418 * Each time the T3-rtx timer expires on any address, or when a
419 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
420 * the error counter of that destination address will be incremented.
421 * When the value in the error counter exceeds the protocol parameter
422 * 'Path.Max.Retrans' of that destination address, the endpoint should
423 * mark the destination transport address as inactive, and a
424 * notification SHOULD be sent to the upper layer.
425 *
426 */
427 static void sctp_do_8_2_transport_strike(struct sctp_association *asoc,
428 struct sctp_transport *transport)
429 {
430 /* The check for association's overall error counter exceeding the
431 * threshold is done in the state function.
432 */
433 /* When probing UNCONFIRMED addresses, the association overall
434 * error count is NOT incremented
435 */
436 if (transport->state != SCTP_UNCONFIRMED)
437 asoc->overall_error_count++;
438
439 if (transport->state != SCTP_INACTIVE &&
440 (transport->error_count++ >= transport->pathmaxrxt)) {
441 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
442 " transport IP: port:%d failed.\n",
443 asoc,
444 (&transport->ipaddr),
445 ntohs(transport->ipaddr.v4.sin_port));
446 sctp_assoc_control_transport(asoc, transport,
447 SCTP_TRANSPORT_DOWN,
448 SCTP_FAILED_THRESHOLD);
449 }
450
451 /* E2) For the destination address for which the timer
452 * expires, set RTO <- RTO * 2 ("back off the timer"). The
453 * maximum value discussed in rule C7 above (RTO.max) may be
454 * used to provide an upper bound to this doubling operation.
455 */
456 transport->rto = min((transport->rto * 2), transport->asoc->rto_max);
457 }
458
459 /* Worker routine to handle INIT command failure. */
460 static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands,
461 struct sctp_association *asoc,
462 unsigned error)
463 {
464 struct sctp_ulpevent *event;
465
466 event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC,
467 (__u16)error, 0, 0, NULL,
468 GFP_ATOMIC);
469
470 if (event)
471 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
472 SCTP_ULPEVENT(event));
473
474 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
475 SCTP_STATE(SCTP_STATE_CLOSED));
476
477 /* SEND_FAILED sent later when cleaning up the association. */
478 asoc->outqueue.error = error;
479 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
480 }
481
482 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
483 static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands,
484 struct sctp_association *asoc,
485 sctp_event_t event_type,
486 sctp_subtype_t subtype,
487 struct sctp_chunk *chunk,
488 unsigned error)
489 {
490 struct sctp_ulpevent *event;
491
492 /* Cancel any partial delivery in progress. */
493 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
494
495 if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT)
496 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
497 (__u16)error, 0, 0, chunk,
498 GFP_ATOMIC);
499 else
500 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
501 (__u16)error, 0, 0, NULL,
502 GFP_ATOMIC);
503 if (event)
504 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
505 SCTP_ULPEVENT(event));
506
507 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
508 SCTP_STATE(SCTP_STATE_CLOSED));
509
510 /* SEND_FAILED sent later when cleaning up the association. */
511 asoc->outqueue.error = error;
512 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
513 }
514
515 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
516 * inside the cookie. In reality, this is only used for INIT-ACK processing
517 * since all other cases use "temporary" associations and can do all
518 * their work in statefuns directly.
519 */
520 static int sctp_cmd_process_init(sctp_cmd_seq_t *commands,
521 struct sctp_association *asoc,
522 struct sctp_chunk *chunk,
523 sctp_init_chunk_t *peer_init,
524 gfp_t gfp)
525 {
526 int error;
527
528 /* We only process the init as a sideeffect in a single
529 * case. This is when we process the INIT-ACK. If we
530 * fail during INIT processing (due to malloc problems),
531 * just return the error and stop processing the stack.
532 */
533 if (!sctp_process_init(asoc, chunk->chunk_hdr->type,
534 sctp_source(chunk), peer_init, gfp))
535 error = -ENOMEM;
536 else
537 error = 0;
538
539 return error;
540 }
541
542 /* Helper function to break out starting up of heartbeat timers. */
543 static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds,
544 struct sctp_association *asoc)
545 {
546 struct sctp_transport *t;
547 struct list_head *pos;
548
549 /* Start a heartbeat timer for each transport on the association.
550 * hold a reference on the transport to make sure none of
551 * the needed data structures go away.
552 */
553 list_for_each(pos, &asoc->peer.transport_addr_list) {
554 t = list_entry(pos, struct sctp_transport, transports);
555
556 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
557 sctp_transport_hold(t);
558 }
559 }
560
561 static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds,
562 struct sctp_association *asoc)
563 {
564 struct sctp_transport *t;
565 struct list_head *pos;
566
567 /* Stop all heartbeat timers. */
568
569 list_for_each(pos, &asoc->peer.transport_addr_list) {
570 t = list_entry(pos, struct sctp_transport, transports);
571 if (del_timer(&t->hb_timer))
572 sctp_transport_put(t);
573 }
574 }
575
576 /* Helper function to stop any pending T3-RTX timers */
577 static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds,
578 struct sctp_association *asoc)
579 {
580 struct sctp_transport *t;
581 struct list_head *pos;
582
583 list_for_each(pos, &asoc->peer.transport_addr_list) {
584 t = list_entry(pos, struct sctp_transport, transports);
585 if (timer_pending(&t->T3_rtx_timer) &&
586 del_timer(&t->T3_rtx_timer)) {
587 sctp_transport_put(t);
588 }
589 }
590 }
591
592
593 /* Helper function to update the heartbeat timer. */
594 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds,
595 struct sctp_association *asoc,
596 struct sctp_transport *t)
597 {
598 /* Update the heartbeat timer. */
599 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
600 sctp_transport_hold(t);
601 }
602
603 /* Helper function to handle the reception of an HEARTBEAT ACK. */
604 static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
605 struct sctp_association *asoc,
606 struct sctp_transport *t,
607 struct sctp_chunk *chunk)
608 {
609 sctp_sender_hb_info_t *hbinfo;
610
611 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
612 * HEARTBEAT should clear the error counter of the destination
613 * transport address to which the HEARTBEAT was sent.
614 * The association's overall error count is also cleared.
615 */
616 t->error_count = 0;
617 t->asoc->overall_error_count = 0;
618
619 /* Mark the destination transport address as active if it is not so
620 * marked.
621 */
622 if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED))
623 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
624 SCTP_HEARTBEAT_SUCCESS);
625
626 /* The receiver of the HEARTBEAT ACK should also perform an
627 * RTT measurement for that destination transport address
628 * using the time value carried in the HEARTBEAT ACK chunk.
629 * If the transport's rto_pending variable has been cleared,
630 * it was most likely due to a retransmit. However, we want
631 * to re-enable it to properly update the rto.
632 */
633 if (t->rto_pending == 0)
634 t->rto_pending = 1;
635
636 hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data;
637 sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at));
638
639 /* Update the heartbeat timer. */
640 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
641 sctp_transport_hold(t);
642 }
643
644 /* Helper function to do a transport reset at the expiry of the hearbeat
645 * timer.
646 */
647 static void sctp_cmd_transport_reset(sctp_cmd_seq_t *cmds,
648 struct sctp_association *asoc,
649 struct sctp_transport *t)
650 {
651 sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE);
652
653 /* Mark one strike against a transport. */
654 sctp_do_8_2_transport_strike(asoc, t);
655 }
656
657 /* Helper function to process the process SACK command. */
658 static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds,
659 struct sctp_association *asoc,
660 struct sctp_sackhdr *sackh)
661 {
662 int err;
663
664 if (sctp_outq_sack(&asoc->outqueue, sackh)) {
665 /* There are no more TSNs awaiting SACK. */
666 err = sctp_do_sm(SCTP_EVENT_T_OTHER,
667 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN),
668 asoc->state, asoc->ep, asoc, NULL,
669 GFP_ATOMIC);
670 } else {
671 /* Windows may have opened, so we need
672 * to check if we have DATA to transmit
673 */
674 err = sctp_outq_flush(&asoc->outqueue, 0);
675 }
676
677 return err;
678 }
679
680 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
681 * the transport for a shutdown chunk.
682 */
683 static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds,
684 struct sctp_association *asoc,
685 struct sctp_chunk *chunk)
686 {
687 struct sctp_transport *t;
688
689 t = sctp_assoc_choose_shutdown_transport(asoc);
690 asoc->shutdown_last_sent_to = t;
691 asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto;
692 chunk->transport = t;
693 }
694
695 /* Helper function to change the state of an association. */
696 static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds,
697 struct sctp_association *asoc,
698 sctp_state_t state)
699 {
700 struct sock *sk = asoc->base.sk;
701
702 asoc->state = state;
703
704 SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n",
705 asoc, sctp_state_tbl[state]);
706
707 if (sctp_style(sk, TCP)) {
708 /* Change the sk->sk_state of a TCP-style socket that has
709 * sucessfully completed a connect() call.
710 */
711 if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED))
712 sk->sk_state = SCTP_SS_ESTABLISHED;
713
714 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
715 if (sctp_state(asoc, SHUTDOWN_RECEIVED) &&
716 sctp_sstate(sk, ESTABLISHED))
717 sk->sk_shutdown |= RCV_SHUTDOWN;
718 }
719
720 if (sctp_state(asoc, COOKIE_WAIT)) {
721 /* Reset init timeouts since they may have been
722 * increased due to timer expirations.
723 */
724 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
725 asoc->rto_initial;
726 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
727 asoc->rto_initial;
728 }
729
730 if (sctp_state(asoc, ESTABLISHED) ||
731 sctp_state(asoc, CLOSED) ||
732 sctp_state(asoc, SHUTDOWN_RECEIVED)) {
733 /* Wake up any processes waiting in the asoc's wait queue in
734 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
735 */
736 if (waitqueue_active(&asoc->wait))
737 wake_up_interruptible(&asoc->wait);
738
739 /* Wake up any processes waiting in the sk's sleep queue of
740 * a TCP-style or UDP-style peeled-off socket in
741 * sctp_wait_for_accept() or sctp_wait_for_packet().
742 * For a UDP-style socket, the waiters are woken up by the
743 * notifications.
744 */
745 if (!sctp_style(sk, UDP))
746 sk->sk_state_change(sk);
747 }
748 }
749
750 /* Helper function to delete an association. */
751 static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds,
752 struct sctp_association *asoc)
753 {
754 struct sock *sk = asoc->base.sk;
755
756 /* If it is a non-temporary association belonging to a TCP-style
757 * listening socket that is not closed, do not free it so that accept()
758 * can pick it up later.
759 */
760 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) &&
761 (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK))
762 return;
763
764 sctp_unhash_established(asoc);
765 sctp_association_free(asoc);
766 }
767
768 /*
769 * ADDIP Section 4.1 ASCONF Chunk Procedures
770 * A4) Start a T-4 RTO timer, using the RTO value of the selected
771 * destination address (we use active path instead of primary path just
772 * because primary path may be inactive.
773 */
774 static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds,
775 struct sctp_association *asoc,
776 struct sctp_chunk *chunk)
777 {
778 struct sctp_transport *t;
779
780 t = asoc->peer.active_path;
781 asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto;
782 chunk->transport = t;
783 }
784
785 /* Process an incoming Operation Error Chunk. */
786 static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds,
787 struct sctp_association *asoc,
788 struct sctp_chunk *chunk)
789 {
790 struct sctp_operr_chunk *operr_chunk;
791 struct sctp_errhdr *err_hdr;
792
793 operr_chunk = (struct sctp_operr_chunk *)chunk->chunk_hdr;
794 err_hdr = &operr_chunk->err_hdr;
795
796 switch (err_hdr->cause) {
797 case SCTP_ERROR_UNKNOWN_CHUNK:
798 {
799 struct sctp_chunkhdr *unk_chunk_hdr;
800
801 unk_chunk_hdr = (struct sctp_chunkhdr *)err_hdr->variable;
802 switch (unk_chunk_hdr->type) {
803 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with an
804 * ERROR chunk reporting that it did not recognized the ASCONF
805 * chunk type, the sender of the ASCONF MUST NOT send any
806 * further ASCONF chunks and MUST stop its T-4 timer.
807 */
808 case SCTP_CID_ASCONF:
809 asoc->peer.asconf_capable = 0;
810 sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP,
811 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO));
812 break;
813 default:
814 break;
815 }
816 break;
817 }
818 default:
819 break;
820 }
821 }
822
823 /* Process variable FWDTSN chunk information. */
824 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq,
825 struct sctp_chunk *chunk)
826 {
827 struct sctp_fwdtsn_skip *skip;
828 /* Walk through all the skipped SSNs */
829 sctp_walk_fwdtsn(skip, chunk) {
830 sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn));
831 }
832
833 return;
834 }
835
836 /* Helper function to remove the association non-primary peer
837 * transports.
838 */
839 static void sctp_cmd_del_non_primary(struct sctp_association *asoc)
840 {
841 struct sctp_transport *t;
842 struct list_head *pos;
843 struct list_head *temp;
844
845 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
846 t = list_entry(pos, struct sctp_transport, transports);
847 if (!sctp_cmp_addr_exact(&t->ipaddr,
848 &asoc->peer.primary_addr)) {
849 sctp_assoc_del_peer(asoc, &t->ipaddr);
850 }
851 }
852
853 return;
854 }
855
856 /* Helper function to set sk_err on a 1-1 style socket. */
857 static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error)
858 {
859 struct sock *sk = asoc->base.sk;
860
861 if (!sctp_style(sk, UDP))
862 sk->sk_err = error;
863 }
864
865 /* Helper function to generate an association change event */
866 static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands,
867 struct sctp_association *asoc,
868 u8 state)
869 {
870 struct sctp_ulpevent *ev;
871
872 ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0,
873 asoc->c.sinit_num_ostreams,
874 asoc->c.sinit_max_instreams,
875 NULL, GFP_ATOMIC);
876 if (ev)
877 sctp_ulpq_tail_event(&asoc->ulpq, ev);
878 }
879
880 /* Helper function to generate an adaptation indication event */
881 static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands,
882 struct sctp_association *asoc)
883 {
884 struct sctp_ulpevent *ev;
885
886 ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC);
887
888 if (ev)
889 sctp_ulpq_tail_event(&asoc->ulpq, ev);
890 }
891
892 /* These three macros allow us to pull the debugging code out of the
893 * main flow of sctp_do_sm() to keep attention focused on the real
894 * functionality there.
895 */
896 #define DEBUG_PRE \
897 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
898 "ep %p, %s, %s, asoc %p[%s], %s\n", \
899 ep, sctp_evttype_tbl[event_type], \
900 (*debug_fn)(subtype), asoc, \
901 sctp_state_tbl[state], state_fn->name)
902
903 #define DEBUG_POST \
904 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
905 "asoc %p, status: %s\n", \
906 asoc, sctp_status_tbl[status])
907
908 #define DEBUG_POST_SFX \
909 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
910 error, asoc, \
911 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
912 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
913
914 /*
915 * This is the master state machine processing function.
916 *
917 * If you want to understand all of lksctp, this is a
918 * good place to start.
919 */
920 int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype,
921 sctp_state_t state,
922 struct sctp_endpoint *ep,
923 struct sctp_association *asoc,
924 void *event_arg,
925 gfp_t gfp)
926 {
927 sctp_cmd_seq_t commands;
928 const sctp_sm_table_entry_t *state_fn;
929 sctp_disposition_t status;
930 int error = 0;
931 typedef const char *(printfn_t)(sctp_subtype_t);
932
933 static printfn_t *table[] = {
934 NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname,
935 };
936 printfn_t *debug_fn __attribute__ ((unused)) = table[event_type];
937
938 /* Look up the state function, run it, and then process the
939 * side effects. These three steps are the heart of lksctp.
940 */
941 state_fn = sctp_sm_lookup_event(event_type, state, subtype);
942
943 sctp_init_cmd_seq(&commands);
944
945 DEBUG_PRE;
946 status = (*state_fn->fn)(ep, asoc, subtype, event_arg, &commands);
947 DEBUG_POST;
948
949 error = sctp_side_effects(event_type, subtype, state,
950 ep, asoc, event_arg, status,
951 &commands, gfp);
952 DEBUG_POST_SFX;
953
954 return error;
955 }
956
957 #undef DEBUG_PRE
958 #undef DEBUG_POST
959
960 /*****************************************************************
961 * This the master state function side effect processing function.
962 *****************************************************************/
963 static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
964 sctp_state_t state,
965 struct sctp_endpoint *ep,
966 struct sctp_association *asoc,
967 void *event_arg,
968 sctp_disposition_t status,
969 sctp_cmd_seq_t *commands,
970 gfp_t gfp)
971 {
972 int error;
973
974 /* FIXME - Most of the dispositions left today would be categorized
975 * as "exceptional" dispositions. For those dispositions, it
976 * may not be proper to run through any of the commands at all.
977 * For example, the command interpreter might be run only with
978 * disposition SCTP_DISPOSITION_CONSUME.
979 */
980 if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state,
981 ep, asoc,
982 event_arg, status,
983 commands, gfp)))
984 goto bail;
985
986 switch (status) {
987 case SCTP_DISPOSITION_DISCARD:
988 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
989 "event_type %d, event_id %d\n",
990 state, event_type, subtype.chunk);
991 break;
992
993 case SCTP_DISPOSITION_NOMEM:
994 /* We ran out of memory, so we need to discard this
995 * packet.
996 */
997 /* BUG--we should now recover some memory, probably by
998 * reneging...
999 */
1000 error = -ENOMEM;
1001 break;
1002
1003 case SCTP_DISPOSITION_DELETE_TCB:
1004 /* This should now be a command. */
1005 break;
1006
1007 case SCTP_DISPOSITION_CONSUME:
1008 case SCTP_DISPOSITION_ABORT:
1009 /*
1010 * We should no longer have much work to do here as the
1011 * real work has been done as explicit commands above.
1012 */
1013 break;
1014
1015 case SCTP_DISPOSITION_VIOLATION:
1016 printk(KERN_ERR "sctp protocol violation state %d "
1017 "chunkid %d\n", state, subtype.chunk);
1018 break;
1019
1020 case SCTP_DISPOSITION_NOT_IMPL:
1021 printk(KERN_WARNING "sctp unimplemented feature in state %d, "
1022 "event_type %d, event_id %d\n",
1023 state, event_type, subtype.chunk);
1024 break;
1025
1026 case SCTP_DISPOSITION_BUG:
1027 printk(KERN_ERR "sctp bug in state %d, "
1028 "event_type %d, event_id %d\n",
1029 state, event_type, subtype.chunk);
1030 BUG();
1031 break;
1032
1033 default:
1034 printk(KERN_ERR "sctp impossible disposition %d "
1035 "in state %d, event_type %d, event_id %d\n",
1036 status, state, event_type, subtype.chunk);
1037 BUG();
1038 break;
1039 }
1040
1041 bail:
1042 return error;
1043 }
1044
1045 /********************************************************************
1046 * 2nd Level Abstractions
1047 ********************************************************************/
1048
1049 /* This is the side-effect interpreter. */
1050 static int sctp_cmd_interpreter(sctp_event_t event_type,
1051 sctp_subtype_t subtype,
1052 sctp_state_t state,
1053 struct sctp_endpoint *ep,
1054 struct sctp_association *asoc,
1055 void *event_arg,
1056 sctp_disposition_t status,
1057 sctp_cmd_seq_t *commands,
1058 gfp_t gfp)
1059 {
1060 int error = 0;
1061 int force;
1062 sctp_cmd_t *cmd;
1063 struct sctp_chunk *new_obj;
1064 struct sctp_chunk *chunk = NULL;
1065 struct sctp_packet *packet;
1066 struct list_head *pos;
1067 struct timer_list *timer;
1068 unsigned long timeout;
1069 struct sctp_transport *t;
1070 struct sctp_sackhdr sackh;
1071 int local_cork = 0;
1072
1073 if (SCTP_EVENT_T_TIMEOUT != event_type)
1074 chunk = (struct sctp_chunk *) event_arg;
1075
1076 /* Note: This whole file is a huge candidate for rework.
1077 * For example, each command could either have its own handler, so
1078 * the loop would look like:
1079 * while (cmds)
1080 * cmd->handle(x, y, z)
1081 * --jgrimm
1082 */
1083 while (NULL != (cmd = sctp_next_cmd(commands))) {
1084 switch (cmd->verb) {
1085 case SCTP_CMD_NOP:
1086 /* Do nothing. */
1087 break;
1088
1089 case SCTP_CMD_NEW_ASOC:
1090 /* Register a new association. */
1091 if (local_cork) {
1092 sctp_outq_uncork(&asoc->outqueue);
1093 local_cork = 0;
1094 }
1095 asoc = cmd->obj.ptr;
1096 /* Register with the endpoint. */
1097 sctp_endpoint_add_asoc(ep, asoc);
1098 sctp_hash_established(asoc);
1099 break;
1100
1101 case SCTP_CMD_UPDATE_ASSOC:
1102 sctp_assoc_update(asoc, cmd->obj.ptr);
1103 break;
1104
1105 case SCTP_CMD_PURGE_OUTQUEUE:
1106 sctp_outq_teardown(&asoc->outqueue);
1107 break;
1108
1109 case SCTP_CMD_DELETE_TCB:
1110 if (local_cork) {
1111 sctp_outq_uncork(&asoc->outqueue);
1112 local_cork = 0;
1113 }
1114 /* Delete the current association. */
1115 sctp_cmd_delete_tcb(commands, asoc);
1116 asoc = NULL;
1117 break;
1118
1119 case SCTP_CMD_NEW_STATE:
1120 /* Enter a new state. */
1121 sctp_cmd_new_state(commands, asoc, cmd->obj.state);
1122 break;
1123
1124 case SCTP_CMD_REPORT_TSN:
1125 /* Record the arrival of a TSN. */
1126 sctp_tsnmap_mark(&asoc->peer.tsn_map, cmd->obj.u32);
1127 break;
1128
1129 case SCTP_CMD_REPORT_FWDTSN:
1130 /* Move the Cumulattive TSN Ack ahead. */
1131 sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32);
1132
1133 /* Abort any in progress partial delivery. */
1134 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
1135 break;
1136
1137 case SCTP_CMD_PROCESS_FWDTSN:
1138 sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.ptr);
1139 break;
1140
1141 case SCTP_CMD_GEN_SACK:
1142 /* Generate a Selective ACK.
1143 * The argument tells us whether to just count
1144 * the packet and MAYBE generate a SACK, or
1145 * force a SACK out.
1146 */
1147 force = cmd->obj.i32;
1148 error = sctp_gen_sack(asoc, force, commands);
1149 break;
1150
1151 case SCTP_CMD_PROCESS_SACK:
1152 /* Process an inbound SACK. */
1153 error = sctp_cmd_process_sack(commands, asoc,
1154 cmd->obj.ptr);
1155 break;
1156
1157 case SCTP_CMD_GEN_INIT_ACK:
1158 /* Generate an INIT ACK chunk. */
1159 new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC,
1160 0);
1161 if (!new_obj)
1162 goto nomem;
1163
1164 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1165 SCTP_CHUNK(new_obj));
1166 break;
1167
1168 case SCTP_CMD_PEER_INIT:
1169 /* Process a unified INIT from the peer.
1170 * Note: Only used during INIT-ACK processing. If
1171 * there is an error just return to the outter
1172 * layer which will bail.
1173 */
1174 error = sctp_cmd_process_init(commands, asoc, chunk,
1175 cmd->obj.ptr, gfp);
1176 break;
1177
1178 case SCTP_CMD_GEN_COOKIE_ECHO:
1179 /* Generate a COOKIE ECHO chunk. */
1180 new_obj = sctp_make_cookie_echo(asoc, chunk);
1181 if (!new_obj) {
1182 if (cmd->obj.ptr)
1183 sctp_chunk_free(cmd->obj.ptr);
1184 goto nomem;
1185 }
1186 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1187 SCTP_CHUNK(new_obj));
1188
1189 /* If there is an ERROR chunk to be sent along with
1190 * the COOKIE_ECHO, send it, too.
1191 */
1192 if (cmd->obj.ptr)
1193 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1194 SCTP_CHUNK(cmd->obj.ptr));
1195
1196 /* FIXME - Eventually come up with a cleaner way to
1197 * enabling COOKIE-ECHO + DATA bundling during
1198 * multihoming stale cookie scenarios, the following
1199 * command plays with asoc->peer.retran_path to
1200 * avoid the problem of sending the COOKIE-ECHO and
1201 * DATA in different paths, which could result
1202 * in the association being ABORTed if the DATA chunk
1203 * is processed first by the server. Checking the
1204 * init error counter simply causes this command
1205 * to be executed only during failed attempts of
1206 * association establishment.
1207 */
1208 if ((asoc->peer.retran_path !=
1209 asoc->peer.primary_path) &&
1210 (asoc->init_err_counter > 0)) {
1211 sctp_add_cmd_sf(commands,
1212 SCTP_CMD_FORCE_PRIM_RETRAN,
1213 SCTP_NULL());
1214 }
1215
1216 break;
1217
1218 case SCTP_CMD_GEN_SHUTDOWN:
1219 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1220 * Reset error counts.
1221 */
1222 asoc->overall_error_count = 0;
1223
1224 /* Generate a SHUTDOWN chunk. */
1225 new_obj = sctp_make_shutdown(asoc, chunk);
1226 if (!new_obj)
1227 goto nomem;
1228 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1229 SCTP_CHUNK(new_obj));
1230 break;
1231
1232 case SCTP_CMD_CHUNK_ULP:
1233 /* Send a chunk to the sockets layer. */
1234 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1235 "chunk_up:", cmd->obj.ptr,
1236 "ulpq:", &asoc->ulpq);
1237 sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.ptr,
1238 GFP_ATOMIC);
1239 break;
1240
1241 case SCTP_CMD_EVENT_ULP:
1242 /* Send a notification to the sockets layer. */
1243 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1244 "event_up:",cmd->obj.ptr,
1245 "ulpq:",&asoc->ulpq);
1246 sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ptr);
1247 break;
1248
1249 case SCTP_CMD_REPLY:
1250 /* If an caller has not already corked, do cork. */
1251 if (!asoc->outqueue.cork) {
1252 sctp_outq_cork(&asoc->outqueue);
1253 local_cork = 1;
1254 }
1255 /* Send a chunk to our peer. */
1256 error = sctp_outq_tail(&asoc->outqueue, cmd->obj.ptr);
1257 break;
1258
1259 case SCTP_CMD_SEND_PKT:
1260 /* Send a full packet to our peer. */
1261 packet = cmd->obj.ptr;
1262 sctp_packet_transmit(packet);
1263 sctp_ootb_pkt_free(packet);
1264 break;
1265
1266 case SCTP_CMD_RETRAN:
1267 /* Mark a transport for retransmission. */
1268 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1269 SCTP_RTXR_T3_RTX);
1270 break;
1271
1272 case SCTP_CMD_TRANSMIT:
1273 /* Kick start transmission. */
1274 error = sctp_outq_uncork(&asoc->outqueue);
1275 local_cork = 0;
1276 break;
1277
1278 case SCTP_CMD_ECN_CE:
1279 /* Do delayed CE processing. */
1280 sctp_do_ecn_ce_work(asoc, cmd->obj.u32);
1281 break;
1282
1283 case SCTP_CMD_ECN_ECNE:
1284 /* Do delayed ECNE processing. */
1285 new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32,
1286 chunk);
1287 if (new_obj)
1288 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1289 SCTP_CHUNK(new_obj));
1290 break;
1291
1292 case SCTP_CMD_ECN_CWR:
1293 /* Do delayed CWR processing. */
1294 sctp_do_ecn_cwr_work(asoc, cmd->obj.u32);
1295 break;
1296
1297 case SCTP_CMD_SETUP_T2:
1298 sctp_cmd_setup_t2(commands, asoc, cmd->obj.ptr);
1299 break;
1300
1301 case SCTP_CMD_TIMER_START:
1302 timer = &asoc->timers[cmd->obj.to];
1303 timeout = asoc->timeouts[cmd->obj.to];
1304 BUG_ON(!timeout);
1305
1306 timer->expires = jiffies + timeout;
1307 sctp_association_hold(asoc);
1308 add_timer(timer);
1309 break;
1310
1311 case SCTP_CMD_TIMER_RESTART:
1312 timer = &asoc->timers[cmd->obj.to];
1313 timeout = asoc->timeouts[cmd->obj.to];
1314 if (!mod_timer(timer, jiffies + timeout))
1315 sctp_association_hold(asoc);
1316 break;
1317
1318 case SCTP_CMD_TIMER_STOP:
1319 timer = &asoc->timers[cmd->obj.to];
1320 if (timer_pending(timer) && del_timer(timer))
1321 sctp_association_put(asoc);
1322 break;
1323
1324 case SCTP_CMD_INIT_CHOOSE_TRANSPORT:
1325 chunk = cmd->obj.ptr;
1326 t = sctp_assoc_choose_init_transport(asoc);
1327 asoc->init_last_sent_to = t;
1328 chunk->transport = t;
1329 t->init_sent_count++;
1330 break;
1331
1332 case SCTP_CMD_INIT_RESTART:
1333 /* Do the needed accounting and updates
1334 * associated with restarting an initialization
1335 * timer. Only multiply the timeout by two if
1336 * all transports have been tried at the current
1337 * timeout.
1338 */
1339 t = asoc->init_last_sent_to;
1340 asoc->init_err_counter++;
1341
1342 if (t->init_sent_count > (asoc->init_cycle + 1)) {
1343 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] *= 2;
1344 if (asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] >
1345 asoc->max_init_timeo) {
1346 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
1347 asoc->max_init_timeo;
1348 }
1349 asoc->init_cycle++;
1350 SCTP_DEBUG_PRINTK(
1351 "T1 INIT Timeout adjustment"
1352 " init_err_counter: %d"
1353 " cycle: %d"
1354 " timeout: %ld\n",
1355 asoc->init_err_counter,
1356 asoc->init_cycle,
1357 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT]);
1358 }
1359
1360 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
1361 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
1362 break;
1363
1364 case SCTP_CMD_COOKIEECHO_RESTART:
1365 /* Do the needed accounting and updates
1366 * associated with restarting an initialization
1367 * timer. Only multiply the timeout by two if
1368 * all transports have been tried at the current
1369 * timeout.
1370 */
1371 asoc->init_err_counter++;
1372
1373 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] *= 2;
1374 if (asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] >
1375 asoc->max_init_timeo) {
1376 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
1377 asoc->max_init_timeo;
1378 }
1379 SCTP_DEBUG_PRINTK(
1380 "T1 COOKIE Timeout adjustment"
1381 " init_err_counter: %d"
1382 " timeout: %ld\n",
1383 asoc->init_err_counter,
1384 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE]);
1385
1386 /* If we've sent any data bundled with
1387 * COOKIE-ECHO we need to resend.
1388 */
1389 list_for_each(pos, &asoc->peer.transport_addr_list) {
1390 t = list_entry(pos, struct sctp_transport,
1391 transports);
1392 sctp_retransmit_mark(&asoc->outqueue, t, 0);
1393 }
1394
1395 sctp_add_cmd_sf(commands,
1396 SCTP_CMD_TIMER_RESTART,
1397 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE));
1398 break;
1399
1400 case SCTP_CMD_INIT_FAILED:
1401 sctp_cmd_init_failed(commands, asoc, cmd->obj.err);
1402 break;
1403
1404 case SCTP_CMD_ASSOC_FAILED:
1405 sctp_cmd_assoc_failed(commands, asoc, event_type,
1406 subtype, chunk, cmd->obj.err);
1407 break;
1408
1409 case SCTP_CMD_INIT_COUNTER_INC:
1410 asoc->init_err_counter++;
1411 break;
1412
1413 case SCTP_CMD_INIT_COUNTER_RESET:
1414 asoc->init_err_counter = 0;
1415 asoc->init_cycle = 0;
1416 break;
1417
1418 case SCTP_CMD_REPORT_DUP:
1419 sctp_tsnmap_mark_dup(&asoc->peer.tsn_map,
1420 cmd->obj.u32);
1421 break;
1422
1423 case SCTP_CMD_REPORT_BAD_TAG:
1424 SCTP_DEBUG_PRINTK("vtag mismatch!\n");
1425 break;
1426
1427 case SCTP_CMD_STRIKE:
1428 /* Mark one strike against a transport. */
1429 sctp_do_8_2_transport_strike(asoc, cmd->obj.transport);
1430 break;
1431
1432 case SCTP_CMD_TRANSPORT_RESET:
1433 t = cmd->obj.transport;
1434 sctp_cmd_transport_reset(commands, asoc, t);
1435 break;
1436
1437 case SCTP_CMD_TRANSPORT_ON:
1438 t = cmd->obj.transport;
1439 sctp_cmd_transport_on(commands, asoc, t, chunk);
1440 break;
1441
1442 case SCTP_CMD_HB_TIMERS_START:
1443 sctp_cmd_hb_timers_start(commands, asoc);
1444 break;
1445
1446 case SCTP_CMD_HB_TIMER_UPDATE:
1447 t = cmd->obj.transport;
1448 sctp_cmd_hb_timer_update(commands, asoc, t);
1449 break;
1450
1451 case SCTP_CMD_HB_TIMERS_STOP:
1452 sctp_cmd_hb_timers_stop(commands, asoc);
1453 break;
1454
1455 case SCTP_CMD_REPORT_ERROR:
1456 error = cmd->obj.error;
1457 break;
1458
1459 case SCTP_CMD_PROCESS_CTSN:
1460 /* Dummy up a SACK for processing. */
1461 sackh.cum_tsn_ack = cmd->obj.be32;
1462 sackh.a_rwnd = 0;
1463 sackh.num_gap_ack_blocks = 0;
1464 sackh.num_dup_tsns = 0;
1465 sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK,
1466 SCTP_SACKH(&sackh));
1467 break;
1468
1469 case SCTP_CMD_DISCARD_PACKET:
1470 /* We need to discard the whole packet. */
1471 chunk->pdiscard = 1;
1472 break;
1473
1474 case SCTP_CMD_RTO_PENDING:
1475 t = cmd->obj.transport;
1476 t->rto_pending = 1;
1477 break;
1478
1479 case SCTP_CMD_PART_DELIVER:
1480 sctp_ulpq_partial_delivery(&asoc->ulpq, cmd->obj.ptr,
1481 GFP_ATOMIC);
1482 break;
1483
1484 case SCTP_CMD_RENEGE:
1485 sctp_ulpq_renege(&asoc->ulpq, cmd->obj.ptr,
1486 GFP_ATOMIC);
1487 break;
1488
1489 case SCTP_CMD_SETUP_T4:
1490 sctp_cmd_setup_t4(commands, asoc, cmd->obj.ptr);
1491 break;
1492
1493 case SCTP_CMD_PROCESS_OPERR:
1494 sctp_cmd_process_operr(commands, asoc, chunk);
1495 break;
1496 case SCTP_CMD_CLEAR_INIT_TAG:
1497 asoc->peer.i.init_tag = 0;
1498 break;
1499 case SCTP_CMD_DEL_NON_PRIMARY:
1500 sctp_cmd_del_non_primary(asoc);
1501 break;
1502 case SCTP_CMD_T3_RTX_TIMERS_STOP:
1503 sctp_cmd_t3_rtx_timers_stop(commands, asoc);
1504 break;
1505 case SCTP_CMD_FORCE_PRIM_RETRAN:
1506 t = asoc->peer.retran_path;
1507 asoc->peer.retran_path = asoc->peer.primary_path;
1508 error = sctp_outq_uncork(&asoc->outqueue);
1509 local_cork = 0;
1510 asoc->peer.retran_path = t;
1511 break;
1512 case SCTP_CMD_SET_SK_ERR:
1513 sctp_cmd_set_sk_err(asoc, cmd->obj.error);
1514 break;
1515 case SCTP_CMD_ASSOC_CHANGE:
1516 sctp_cmd_assoc_change(commands, asoc,
1517 cmd->obj.u8);
1518 break;
1519 case SCTP_CMD_ADAPTATION_IND:
1520 sctp_cmd_adaptation_ind(commands, asoc);
1521 break;
1522
1523 default:
1524 printk(KERN_WARNING "Impossible command: %u, %p\n",
1525 cmd->verb, cmd->obj.ptr);
1526 break;
1527 }
1528
1529 if (error)
1530 break;
1531 }
1532
1533 out:
1534 if (local_cork)
1535 sctp_outq_uncork(&asoc->outqueue);
1536 return error;
1537 nomem:
1538 error = -ENOMEM;
1539 goto out;
1540 }
1541
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