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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
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,
66 int gfp);
67static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
68 sctp_state_t state,
69 struct sctp_endpoint *ep,
70 struct sctp_association *asoc,
71 void *event_arg,
72 sctp_disposition_t status,
73 sctp_cmd_seq_t *commands,
74 int gfp);
75
76/********************************************************************
77 * Helper functions
78 ********************************************************************/
79
80/* A helper function for delayed processing of INET ECN CE bit. */
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
417 if (transport->active &&
418 (transport->error_count++ >= transport->max_retrans)) {
419 SCTP_DEBUG_PRINTK("transport_strike: transport "
420 "IP:%d.%d.%d.%d failed.\n",
421 NIPQUAD(transport->ipaddr.v4.sin_addr));
422 sctp_assoc_control_transport(asoc, transport,
423 SCTP_TRANSPORT_DOWN,
424 SCTP_FAILED_THRESHOLD);
425 }
426
427 /* E2) For the destination address for which the timer
428 * expires, set RTO <- RTO * 2 ("back off the timer"). The
429 * maximum value discussed in rule C7 above (RTO.max) may be
430 * used to provide an upper bound to this doubling operation.
431 */
432 transport->rto = min((transport->rto * 2), transport->asoc->rto_max);
433}
434
435/* Worker routine to handle INIT command failure. */
436static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands,
437 struct sctp_association *asoc,
438 unsigned error)
439{
440 struct sctp_ulpevent *event;
441
442 event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC,
443 (__u16)error, 0, 0,
444 GFP_ATOMIC);
445
446 if (event)
447 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
448 SCTP_ULPEVENT(event));
449
450 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
451 SCTP_STATE(SCTP_STATE_CLOSED));
452
453 /* SEND_FAILED sent later when cleaning up the association. */
454 asoc->outqueue.error = error;
455 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
456}
457
458/* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
459static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands,
460 struct sctp_association *asoc,
461 sctp_event_t event_type,
462 sctp_subtype_t subtype,
463 struct sctp_chunk *chunk,
464 unsigned error)
465{
466 struct sctp_ulpevent *event;
467
468 /* Cancel any partial delivery in progress. */
469 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
470
471 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
472 (__u16)error, 0, 0,
473 GFP_ATOMIC);
474 if (event)
475 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
476 SCTP_ULPEVENT(event));
477
478 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
479 SCTP_STATE(SCTP_STATE_CLOSED));
480
481 /* Set sk_err to ECONNRESET on a 1-1 style socket. */
482 if (!sctp_style(asoc->base.sk, UDP))
483 asoc->base.sk->sk_err = ECONNRESET;
484
485 /* SEND_FAILED sent later when cleaning up the association. */
486 asoc->outqueue.error = error;
487 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
488}
489
490/* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
491 * inside the cookie. In reality, this is only used for INIT-ACK processing
492 * since all other cases use "temporary" associations and can do all
493 * their work in statefuns directly.
494 */
495static int sctp_cmd_process_init(sctp_cmd_seq_t *commands,
496 struct sctp_association *asoc,
497 struct sctp_chunk *chunk,
498 sctp_init_chunk_t *peer_init, int gfp)
499{
500 int error;
501
502 /* We only process the init as a sideeffect in a single
503 * case. This is when we process the INIT-ACK. If we
504 * fail during INIT processing (due to malloc problems),
505 * just return the error and stop processing the stack.
506 */
507 if (!sctp_process_init(asoc, chunk->chunk_hdr->type,
508 sctp_source(chunk), peer_init, gfp))
509 error = -ENOMEM;
510 else
511 error = 0;
512
513 return error;
514}
515
516/* Helper function to break out starting up of heartbeat timers. */
517static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds,
518 struct sctp_association *asoc)
519{
520 struct sctp_transport *t;
521 struct list_head *pos;
522
523 /* Start a heartbeat timer for each transport on the association.
524 * hold a reference on the transport to make sure none of
525 * the needed data structures go away.
526 */
527 list_for_each(pos, &asoc->peer.transport_addr_list) {
528 t = list_entry(pos, struct sctp_transport, transports);
529
530 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
531 sctp_transport_hold(t);
532 }
533}
534
535static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds,
536 struct sctp_association *asoc)
537{
538 struct sctp_transport *t;
539 struct list_head *pos;
540
541 /* Stop all heartbeat timers. */
542
543 list_for_each(pos, &asoc->peer.transport_addr_list) {
544 t = list_entry(pos, struct sctp_transport, transports);
545 if (del_timer(&t->hb_timer))
546 sctp_transport_put(t);
547 }
548}
549
550/* Helper function to stop any pending T3-RTX timers */
551static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds,
552 struct sctp_association *asoc)
553{
554 struct sctp_transport *t;
555 struct list_head *pos;
556
557 list_for_each(pos, &asoc->peer.transport_addr_list) {
558 t = list_entry(pos, struct sctp_transport, transports);
559 if (timer_pending(&t->T3_rtx_timer) &&
560 del_timer(&t->T3_rtx_timer)) {
561 sctp_transport_put(t);
562 }
563 }
564}
565
566
567/* Helper function to update the heartbeat timer. */
568static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds,
569 struct sctp_association *asoc,
570 struct sctp_transport *t)
571{
572 /* Update the heartbeat timer. */
573 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
574 sctp_transport_hold(t);
575}
576
577/* Helper function to handle the reception of an HEARTBEAT ACK. */
578static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
579 struct sctp_association *asoc,
580 struct sctp_transport *t,
581 struct sctp_chunk *chunk)
582{
583 sctp_sender_hb_info_t *hbinfo;
584
585 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
586 * HEARTBEAT should clear the error counter of the destination
587 * transport address to which the HEARTBEAT was sent.
588 * The association's overall error count is also cleared.
589 */
590 t->error_count = 0;
591 t->asoc->overall_error_count = 0;
592
593 /* Mark the destination transport address as active if it is not so
594 * marked.
595 */
596 if (!t->active)
597 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
598 SCTP_HEARTBEAT_SUCCESS);
599
600 /* The receiver of the HEARTBEAT ACK should also perform an
601 * RTT measurement for that destination transport address
602 * using the time value carried in the HEARTBEAT ACK chunk.
603 */
604 hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data;
605 sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at));
606}
607
608/* Helper function to do a transport reset at the expiry of the hearbeat
609 * timer.
610 */
611static void sctp_cmd_transport_reset(sctp_cmd_seq_t *cmds,
612 struct sctp_association *asoc,
613 struct sctp_transport *t)
614{
615 sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE);
616
617 /* Mark one strike against a transport. */
618 sctp_do_8_2_transport_strike(asoc, t);
619}
620
621/* Helper function to process the process SACK command. */
622static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds,
623 struct sctp_association *asoc,
624 struct sctp_sackhdr *sackh)
625{
626 int err;
627
628 if (sctp_outq_sack(&asoc->outqueue, sackh)) {
629 /* There are no more TSNs awaiting SACK. */
630 err = sctp_do_sm(SCTP_EVENT_T_OTHER,
631 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN),
632 asoc->state, asoc->ep, asoc, NULL,
633 GFP_ATOMIC);
634 } else {
635 /* Windows may have opened, so we need
636 * to check if we have DATA to transmit
637 */
638 err = sctp_outq_flush(&asoc->outqueue, 0);
639 }
640
641 return err;
642}
643
644/* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
645 * the transport for a shutdown chunk.
646 */
647static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds,
648 struct sctp_association *asoc,
649 struct sctp_chunk *chunk)
650{
651 struct sctp_transport *t;
652
653 t = sctp_assoc_choose_shutdown_transport(asoc);
654 asoc->shutdown_last_sent_to = t;
655 asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto;
656 chunk->transport = t;
657}
658
659/* Helper function to change the state of an association. */
660static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds,
661 struct sctp_association *asoc,
662 sctp_state_t state)
663{
664 struct sock *sk = asoc->base.sk;
665
666 asoc->state = state;
667
668 if (sctp_style(sk, TCP)) {
669 /* Change the sk->sk_state of a TCP-style socket that has
670 * sucessfully completed a connect() call.
671 */
672 if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED))
673 sk->sk_state = SCTP_SS_ESTABLISHED;
674
675 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
676 if (sctp_state(asoc, SHUTDOWN_RECEIVED) &&
677 sctp_sstate(sk, ESTABLISHED))
678 sk->sk_shutdown |= RCV_SHUTDOWN;
679 }
680
681 if (sctp_state(asoc, ESTABLISHED) ||
682 sctp_state(asoc, CLOSED) ||
683 sctp_state(asoc, SHUTDOWN_RECEIVED)) {
684 /* Wake up any processes waiting in the asoc's wait queue in
685 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
686 */
687 if (waitqueue_active(&asoc->wait))
688 wake_up_interruptible(&asoc->wait);
689
690 /* Wake up any processes waiting in the sk's sleep queue of
691 * a TCP-style or UDP-style peeled-off socket in
692 * sctp_wait_for_accept() or sctp_wait_for_packet().
693 * For a UDP-style socket, the waiters are woken up by the
694 * notifications.
695 */
696 if (!sctp_style(sk, UDP))
697 sk->sk_state_change(sk);
698 }
699}
700
701/* Helper function to delete an association. */
702static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds,
703 struct sctp_association *asoc)
704{
705 struct sock *sk = asoc->base.sk;
706
707 /* If it is a non-temporary association belonging to a TCP-style
708 * listening socket that is not closed, do not free it so that accept()
709 * can pick it up later.
710 */
711 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) &&
712 (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK))
713 return;
714
715 sctp_unhash_established(asoc);
716 sctp_association_free(asoc);
717}
718
719/*
720 * ADDIP Section 4.1 ASCONF Chunk Procedures
721 * A4) Start a T-4 RTO timer, using the RTO value of the selected
722 * destination address (we use active path instead of primary path just
723 * because primary path may be inactive.
724 */
725static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds,
726 struct sctp_association *asoc,
727 struct sctp_chunk *chunk)
728{
729 struct sctp_transport *t;
730
731 t = asoc->peer.active_path;
732 asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto;
733 chunk->transport = t;
734}
735
736/* Process an incoming Operation Error Chunk. */
737static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds,
738 struct sctp_association *asoc,
739 struct sctp_chunk *chunk)
740{
741 struct sctp_operr_chunk *operr_chunk;
742 struct sctp_errhdr *err_hdr;
743
744 operr_chunk = (struct sctp_operr_chunk *)chunk->chunk_hdr;
745 err_hdr = &operr_chunk->err_hdr;
746
747 switch (err_hdr->cause) {
748 case SCTP_ERROR_UNKNOWN_CHUNK:
749 {
750 struct sctp_chunkhdr *unk_chunk_hdr;
751
752 unk_chunk_hdr = (struct sctp_chunkhdr *)err_hdr->variable;
753 switch (unk_chunk_hdr->type) {
754 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with an
755 * ERROR chunk reporting that it did not recognized the ASCONF
756 * chunk type, the sender of the ASCONF MUST NOT send any
757 * further ASCONF chunks and MUST stop its T-4 timer.
758 */
759 case SCTP_CID_ASCONF:
760 asoc->peer.asconf_capable = 0;
761 sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP,
762 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO));
763 break;
764 default:
765 break;
766 }
767 break;
768 }
769 default:
770 break;
771 }
772}
773
774/* Process variable FWDTSN chunk information. */
775static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq,
776 struct sctp_chunk *chunk)
777{
778 struct sctp_fwdtsn_skip *skip;
779 /* Walk through all the skipped SSNs */
780 sctp_walk_fwdtsn(skip, chunk) {
781 sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn));
782 }
783
784 return;
785}
786
787/* Helper function to remove the association non-primary peer
788 * transports.
789 */
790static void sctp_cmd_del_non_primary(struct sctp_association *asoc)
791{
792 struct sctp_transport *t;
793 struct list_head *pos;
794 struct list_head *temp;
795
796 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
797 t = list_entry(pos, struct sctp_transport, transports);
798 if (!sctp_cmp_addr_exact(&t->ipaddr,
799 &asoc->peer.primary_addr)) {
800 sctp_assoc_del_peer(asoc, &t->ipaddr);
801 }
802 }
803
804 return;
805}
806
807/* These three macros allow us to pull the debugging code out of the
808 * main flow of sctp_do_sm() to keep attention focused on the real
809 * functionality there.
810 */
811#define DEBUG_PRE \
812 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
813 "ep %p, %s, %s, asoc %p[%s], %s\n", \
814 ep, sctp_evttype_tbl[event_type], \
815 (*debug_fn)(subtype), asoc, \
816 sctp_state_tbl[state], state_fn->name)
817
818#define DEBUG_POST \
819 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
820 "asoc %p, status: %s\n", \
821 asoc, sctp_status_tbl[status])
822
823#define DEBUG_POST_SFX \
824 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
825 error, asoc, \
826 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
827 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
828
829/*
830 * This is the master state machine processing function.
831 *
832 * If you want to understand all of lksctp, this is a
833 * good place to start.
834 */
835int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype,
836 sctp_state_t state,
837 struct sctp_endpoint *ep,
838 struct sctp_association *asoc,
839 void *event_arg,
840 int gfp)
841{
842 sctp_cmd_seq_t commands;
843 const sctp_sm_table_entry_t *state_fn;
844 sctp_disposition_t status;
845 int error = 0;
846 typedef const char *(printfn_t)(sctp_subtype_t);
847
848 static printfn_t *table[] = {
849 NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname,
850 };
851 printfn_t *debug_fn __attribute__ ((unused)) = table[event_type];
852
853 /* Look up the state function, run it, and then process the
854 * side effects. These three steps are the heart of lksctp.
855 */
856 state_fn = sctp_sm_lookup_event(event_type, state, subtype);
857
858 sctp_init_cmd_seq(&commands);
859
860 DEBUG_PRE;
861 status = (*state_fn->fn)(ep, asoc, subtype, event_arg, &commands);
862 DEBUG_POST;
863
864 error = sctp_side_effects(event_type, subtype, state,
865 ep, asoc, event_arg, status,
866 &commands, gfp);
867 DEBUG_POST_SFX;
868
869 return error;
870}
871
872#undef DEBUG_PRE
873#undef DEBUG_POST
874
875/*****************************************************************
876 * This the master state function side effect processing function.
877 *****************************************************************/
878static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
879 sctp_state_t state,
880 struct sctp_endpoint *ep,
881 struct sctp_association *asoc,
882 void *event_arg,
883 sctp_disposition_t status,
884 sctp_cmd_seq_t *commands,
885 int gfp)
886{
887 int error;
888
889 /* FIXME - Most of the dispositions left today would be categorized
890 * as "exceptional" dispositions. For those dispositions, it
891 * may not be proper to run through any of the commands at all.
892 * For example, the command interpreter might be run only with
893 * disposition SCTP_DISPOSITION_CONSUME.
894 */
895 if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state,
896 ep, asoc,
897 event_arg, status,
898 commands, gfp)))
899 goto bail;
900
901 switch (status) {
902 case SCTP_DISPOSITION_DISCARD:
903 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
904 "event_type %d, event_id %d\n",
905 state, event_type, subtype.chunk);
906 break;
907
908 case SCTP_DISPOSITION_NOMEM:
909 /* We ran out of memory, so we need to discard this
910 * packet.
911 */
912 /* BUG--we should now recover some memory, probably by
913 * reneging...
914 */
915 error = -ENOMEM;
916 break;
917
918 case SCTP_DISPOSITION_DELETE_TCB:
919 /* This should now be a command. */
920 break;
921
922 case SCTP_DISPOSITION_CONSUME:
923 case SCTP_DISPOSITION_ABORT:
924 /*
925 * We should no longer have much work to do here as the
926 * real work has been done as explicit commands above.
927 */
928 break;
929
930 case SCTP_DISPOSITION_VIOLATION:
931 printk(KERN_ERR "sctp protocol violation state %d "
932 "chunkid %d\n", state, subtype.chunk);
933 break;
934
935 case SCTP_DISPOSITION_NOT_IMPL:
936 printk(KERN_WARNING "sctp unimplemented feature in state %d, "
937 "event_type %d, event_id %d\n",
938 state, event_type, subtype.chunk);
939 break;
940
941 case SCTP_DISPOSITION_BUG:
942 printk(KERN_ERR "sctp bug in state %d, "
943 "event_type %d, event_id %d\n",
944 state, event_type, subtype.chunk);
945 BUG();
946 break;
947
948 default:
949 printk(KERN_ERR "sctp impossible disposition %d "
950 "in state %d, event_type %d, event_id %d\n",
951 status, state, event_type, subtype.chunk);
952 BUG();
953 break;
954 };
955
956bail:
957 return error;
958}
959
960/********************************************************************
961 * 2nd Level Abstractions
962 ********************************************************************/
963
964/* This is the side-effect interpreter. */
965static int sctp_cmd_interpreter(sctp_event_t event_type,
966 sctp_subtype_t subtype,
967 sctp_state_t state,
968 struct sctp_endpoint *ep,
969 struct sctp_association *asoc,
970 void *event_arg,
971 sctp_disposition_t status,
972 sctp_cmd_seq_t *commands,
973 int gfp)
974{
975 int error = 0;
976 int force;
977 sctp_cmd_t *cmd;
978 struct sctp_chunk *new_obj;
979 struct sctp_chunk *chunk = NULL;
980 struct sctp_packet *packet;
981 struct list_head *pos;
982 struct timer_list *timer;
983 unsigned long timeout;
984 struct sctp_transport *t;
985 struct sctp_sackhdr sackh;
986 int local_cork = 0;
987
988 if (SCTP_EVENT_T_TIMEOUT != event_type)
989 chunk = (struct sctp_chunk *) event_arg;
990
991 /* Note: This whole file is a huge candidate for rework.
992 * For example, each command could either have its own handler, so
993 * the loop would look like:
994 * while (cmds)
995 * cmd->handle(x, y, z)
996 * --jgrimm
997 */
998 while (NULL != (cmd = sctp_next_cmd(commands))) {
999 switch (cmd->verb) {
1000 case SCTP_CMD_NOP:
1001 /* Do nothing. */
1002 break;
1003
1004 case SCTP_CMD_NEW_ASOC:
1005 /* Register a new association. */
1006 if (local_cork) {
1007 sctp_outq_uncork(&asoc->outqueue);
1008 local_cork = 0;
1009 }
1010 asoc = cmd->obj.ptr;
1011 /* Register with the endpoint. */
1012 sctp_endpoint_add_asoc(ep, asoc);
1013 sctp_hash_established(asoc);
1014 break;
1015
1016 case SCTP_CMD_UPDATE_ASSOC:
1017 sctp_assoc_update(asoc, cmd->obj.ptr);
1018 break;
1019
1020 case SCTP_CMD_PURGE_OUTQUEUE:
1021 sctp_outq_teardown(&asoc->outqueue);
1022 break;
1023
1024 case SCTP_CMD_DELETE_TCB:
1025 if (local_cork) {
1026 sctp_outq_uncork(&asoc->outqueue);
1027 local_cork = 0;
1028 }
1029 /* Delete the current association. */
1030 sctp_cmd_delete_tcb(commands, asoc);
1031 asoc = NULL;
1032 break;
1033
1034 case SCTP_CMD_NEW_STATE:
1035 /* Enter a new state. */
1036 sctp_cmd_new_state(commands, asoc, cmd->obj.state);
1037 break;
1038
1039 case SCTP_CMD_REPORT_TSN:
1040 /* Record the arrival of a TSN. */
1041 sctp_tsnmap_mark(&asoc->peer.tsn_map, cmd->obj.u32);
1042 break;
1043
1044 case SCTP_CMD_REPORT_FWDTSN:
1045 /* Move the Cumulattive TSN Ack ahead. */
1046 sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32);
1047
1048 /* Abort any in progress partial delivery. */
1049 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
1050 break;
1051
1052 case SCTP_CMD_PROCESS_FWDTSN:
1053 sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.ptr);
1054 break;
1055
1056 case SCTP_CMD_GEN_SACK:
1057 /* Generate a Selective ACK.
1058 * The argument tells us whether to just count
1059 * the packet and MAYBE generate a SACK, or
1060 * force a SACK out.
1061 */
1062 force = cmd->obj.i32;
1063 error = sctp_gen_sack(asoc, force, commands);
1064 break;
1065
1066 case SCTP_CMD_PROCESS_SACK:
1067 /* Process an inbound SACK. */
1068 error = sctp_cmd_process_sack(commands, asoc,
1069 cmd->obj.ptr);
1070 break;
1071
1072 case SCTP_CMD_GEN_INIT_ACK:
1073 /* Generate an INIT ACK chunk. */
1074 new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC,
1075 0);
1076 if (!new_obj)
1077 goto nomem;
1078
1079 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1080 SCTP_CHUNK(new_obj));
1081 break;
1082
1083 case SCTP_CMD_PEER_INIT:
1084 /* Process a unified INIT from the peer.
1085 * Note: Only used during INIT-ACK processing. If
1086 * there is an error just return to the outter
1087 * layer which will bail.
1088 */
1089 error = sctp_cmd_process_init(commands, asoc, chunk,
1090 cmd->obj.ptr, gfp);
1091 break;
1092
1093 case SCTP_CMD_GEN_COOKIE_ECHO:
1094 /* Generate a COOKIE ECHO chunk. */
1095 new_obj = sctp_make_cookie_echo(asoc, chunk);
1096 if (!new_obj) {
1097 if (cmd->obj.ptr)
1098 sctp_chunk_free(cmd->obj.ptr);
1099 goto nomem;
1100 }
1101 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1102 SCTP_CHUNK(new_obj));
1103
1104 /* If there is an ERROR chunk to be sent along with
1105 * the COOKIE_ECHO, send it, too.
1106 */
1107 if (cmd->obj.ptr)
1108 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1109 SCTP_CHUNK(cmd->obj.ptr));
1110
1111 /* FIXME - Eventually come up with a cleaner way to
1112 * enabling COOKIE-ECHO + DATA bundling during
1113 * multihoming stale cookie scenarios, the following
1114 * command plays with asoc->peer.retran_path to
1115 * avoid the problem of sending the COOKIE-ECHO and
1116 * DATA in different paths, which could result
1117 * in the association being ABORTed if the DATA chunk
1118 * is processed first by the server. Checking the
1119 * init error counter simply causes this command
1120 * to be executed only during failed attempts of
1121 * association establishment.
1122 */
1123 if ((asoc->peer.retran_path !=
1124 asoc->peer.primary_path) &&
1125 (asoc->counters[SCTP_COUNTER_INIT_ERROR] > 0)) {
1126 sctp_add_cmd_sf(commands,
1127 SCTP_CMD_FORCE_PRIM_RETRAN,
1128 SCTP_NULL());
1129 }
1130
1131 break;
1132
1133 case SCTP_CMD_GEN_SHUTDOWN:
1134 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1135 * Reset error counts.
1136 */
1137 asoc->overall_error_count = 0;
1138
1139 /* Generate a SHUTDOWN chunk. */
1140 new_obj = sctp_make_shutdown(asoc, chunk);
1141 if (!new_obj)
1142 goto nomem;
1143 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1144 SCTP_CHUNK(new_obj));
1145 break;
1146
1147 case SCTP_CMD_CHUNK_ULP:
1148 /* Send a chunk to the sockets layer. */
1149 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1150 "chunk_up:", cmd->obj.ptr,
1151 "ulpq:", &asoc->ulpq);
1152 sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.ptr,
1153 GFP_ATOMIC);
1154 break;
1155
1156 case SCTP_CMD_EVENT_ULP:
1157 /* Send a notification to the sockets layer. */
1158 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1159 "event_up:",cmd->obj.ptr,
1160 "ulpq:",&asoc->ulpq);
1161 sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ptr);
1162 break;
1163
1164 case SCTP_CMD_REPLY:
1165 /* If an caller has not already corked, do cork. */
1166 if (!asoc->outqueue.cork) {
1167 sctp_outq_cork(&asoc->outqueue);
1168 local_cork = 1;
1169 }
1170 /* Send a chunk to our peer. */
1171 error = sctp_outq_tail(&asoc->outqueue, cmd->obj.ptr);
1172 break;
1173
1174 case SCTP_CMD_SEND_PKT:
1175 /* Send a full packet to our peer. */
1176 packet = cmd->obj.ptr;
1177 sctp_packet_transmit(packet);
1178 sctp_ootb_pkt_free(packet);
1179 break;
1180
1181 case SCTP_CMD_RETRAN:
1182 /* Mark a transport for retransmission. */
1183 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1184 SCTP_RTXR_T3_RTX);
1185 break;
1186
1187 case SCTP_CMD_TRANSMIT:
1188 /* Kick start transmission. */
1189 error = sctp_outq_uncork(&asoc->outqueue);
1190 local_cork = 0;
1191 break;
1192
1193 case SCTP_CMD_ECN_CE:
1194 /* Do delayed CE processing. */
1195 sctp_do_ecn_ce_work(asoc, cmd->obj.u32);
1196 break;
1197
1198 case SCTP_CMD_ECN_ECNE:
1199 /* Do delayed ECNE processing. */
1200 new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32,
1201 chunk);
1202 if (new_obj)
1203 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1204 SCTP_CHUNK(new_obj));
1205 break;
1206
1207 case SCTP_CMD_ECN_CWR:
1208 /* Do delayed CWR processing. */
1209 sctp_do_ecn_cwr_work(asoc, cmd->obj.u32);
1210 break;
1211
1212 case SCTP_CMD_SETUP_T2:
1213 sctp_cmd_setup_t2(commands, asoc, cmd->obj.ptr);
1214 break;
1215
1216 case SCTP_CMD_TIMER_START:
1217 timer = &asoc->timers[cmd->obj.to];
1218 timeout = asoc->timeouts[cmd->obj.to];
1219 if (!timeout)
1220 BUG();
1221
1222 timer->expires = jiffies + timeout;
1223 sctp_association_hold(asoc);
1224 add_timer(timer);
1225 break;
1226
1227 case SCTP_CMD_TIMER_RESTART:
1228 timer = &asoc->timers[cmd->obj.to];
1229 timeout = asoc->timeouts[cmd->obj.to];
1230 if (!mod_timer(timer, jiffies + timeout))
1231 sctp_association_hold(asoc);
1232 break;
1233
1234 case SCTP_CMD_TIMER_STOP:
1235 timer = &asoc->timers[cmd->obj.to];
1236 if (timer_pending(timer) && del_timer(timer))
1237 sctp_association_put(asoc);
1238 break;
1239
1240 case SCTP_CMD_INIT_RESTART:
1241 /* Do the needed accounting and updates
1242 * associated with restarting an initialization
1243 * timer.
1244 */
1245 asoc->counters[SCTP_COUNTER_INIT_ERROR]++;
1246 asoc->timeouts[cmd->obj.to] *= 2;
1247 if (asoc->timeouts[cmd->obj.to] >
1248 asoc->max_init_timeo) {
1249 asoc->timeouts[cmd->obj.to] =
1250 asoc->max_init_timeo;
1251 }
1252
1253 /* If we've sent any data bundled with
1254 * COOKIE-ECHO we need to resend.
1255 */
1256 list_for_each(pos, &asoc->peer.transport_addr_list) {
1257 t = list_entry(pos, struct sctp_transport,
1258 transports);
1259 sctp_retransmit_mark(&asoc->outqueue, t, 0);
1260 }
1261
1262 sctp_add_cmd_sf(commands,
1263 SCTP_CMD_TIMER_RESTART,
1264 SCTP_TO(cmd->obj.to));
1265 break;
1266
1267 case SCTP_CMD_INIT_FAILED:
1268 sctp_cmd_init_failed(commands, asoc, cmd->obj.u32);
1269 break;
1270
1271 case SCTP_CMD_ASSOC_FAILED:
1272 sctp_cmd_assoc_failed(commands, asoc, event_type,
1273 subtype, chunk, cmd->obj.u32);
1274 break;
1275
1276 case SCTP_CMD_COUNTER_INC:
1277 asoc->counters[cmd->obj.counter]++;
1278 break;
1279
1280 case SCTP_CMD_COUNTER_RESET:
1281 asoc->counters[cmd->obj.counter] = 0;
1282 break;
1283
1284 case SCTP_CMD_REPORT_DUP:
1285 sctp_tsnmap_mark_dup(&asoc->peer.tsn_map,
1286 cmd->obj.u32);
1287 break;
1288
1289 case SCTP_CMD_REPORT_BAD_TAG:
1290 SCTP_DEBUG_PRINTK("vtag mismatch!\n");
1291 break;
1292
1293 case SCTP_CMD_STRIKE:
1294 /* Mark one strike against a transport. */
1295 sctp_do_8_2_transport_strike(asoc, cmd->obj.transport);
1296 break;
1297
1298 case SCTP_CMD_TRANSPORT_RESET:
1299 t = cmd->obj.transport;
1300 sctp_cmd_transport_reset(commands, asoc, t);
1301 break;
1302
1303 case SCTP_CMD_TRANSPORT_ON:
1304 t = cmd->obj.transport;
1305 sctp_cmd_transport_on(commands, asoc, t, chunk);
1306 break;
1307
1308 case SCTP_CMD_HB_TIMERS_START:
1309 sctp_cmd_hb_timers_start(commands, asoc);
1310 break;
1311
1312 case SCTP_CMD_HB_TIMER_UPDATE:
1313 t = cmd->obj.transport;
1314 sctp_cmd_hb_timer_update(commands, asoc, t);
1315 break;
1316
1317 case SCTP_CMD_HB_TIMERS_STOP:
1318 sctp_cmd_hb_timers_stop(commands, asoc);
1319 break;
1320
1321 case SCTP_CMD_REPORT_ERROR:
1322 error = cmd->obj.error;
1323 break;
1324
1325 case SCTP_CMD_PROCESS_CTSN:
1326 /* Dummy up a SACK for processing. */
1327 sackh.cum_tsn_ack = cmd->obj.u32;
1328 sackh.a_rwnd = 0;
1329 sackh.num_gap_ack_blocks = 0;
1330 sackh.num_dup_tsns = 0;
1331 sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK,
1332 SCTP_SACKH(&sackh));
1333 break;
1334
1335 case SCTP_CMD_DISCARD_PACKET:
1336 /* We need to discard the whole packet. */
1337 chunk->pdiscard = 1;
1338 break;
1339
1340 case SCTP_CMD_RTO_PENDING:
1341 t = cmd->obj.transport;
1342 t->rto_pending = 1;
1343 break;
1344
1345 case SCTP_CMD_PART_DELIVER:
1346 sctp_ulpq_partial_delivery(&asoc->ulpq, cmd->obj.ptr,
1347 GFP_ATOMIC);
1348 break;
1349
1350 case SCTP_CMD_RENEGE:
1351 sctp_ulpq_renege(&asoc->ulpq, cmd->obj.ptr,
1352 GFP_ATOMIC);
1353 break;
1354
1355 case SCTP_CMD_SETUP_T4:
1356 sctp_cmd_setup_t4(commands, asoc, cmd->obj.ptr);
1357 break;
1358
1359 case SCTP_CMD_PROCESS_OPERR:
1360 sctp_cmd_process_operr(commands, asoc, chunk);
1361 break;
1362 case SCTP_CMD_CLEAR_INIT_TAG:
1363 asoc->peer.i.init_tag = 0;
1364 break;
1365 case SCTP_CMD_DEL_NON_PRIMARY:
1366 sctp_cmd_del_non_primary(asoc);
1367 break;
1368 case SCTP_CMD_T3_RTX_TIMERS_STOP:
1369 sctp_cmd_t3_rtx_timers_stop(commands, asoc);
1370 break;
1371 case SCTP_CMD_FORCE_PRIM_RETRAN:
1372 t = asoc->peer.retran_path;
1373 asoc->peer.retran_path = asoc->peer.primary_path;
1374 error = sctp_outq_uncork(&asoc->outqueue);
1375 local_cork = 0;
1376 asoc->peer.retran_path = t;
1377 break;
1378 default:
1379 printk(KERN_WARNING "Impossible command: %u, %p\n",
1380 cmd->verb, cmd->obj.ptr);
1381 break;
1382 };
1383 if (error)
1384 break;
1385 }
1386
1387out:
1388 if (local_cork)
1389 sctp_outq_uncork(&asoc->outqueue);
1390 return error;
1391nomem:
1392 error = -ENOMEM;
1393 goto out;
1394}
1395
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-12 11:02:26 -0500