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[SCTP]: Update SCTP_PEER_ADDR_PARAMS socket option to the latest api draft.
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / sctp / sm_sideeffect.c
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 error = sctp_outq_tail(&asoc->outqueue, 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 asoc->overall_error_count++;
434
435 if (transport->state != SCTP_INACTIVE &&
436 (transport->error_count++ >= transport->pathmaxrxt)) {
437 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
438 " transport IP: port:%d failed.\n",
439 asoc,
440 (&transport->ipaddr),
441 transport->ipaddr.v4.sin_port);
442 sctp_assoc_control_transport(asoc, transport,
443 SCTP_TRANSPORT_DOWN,
444 SCTP_FAILED_THRESHOLD);
445 }
446
447 /* E2) For the destination address for which the timer
448 * expires, set RTO <- RTO * 2 ("back off the timer"). The
449 * maximum value discussed in rule C7 above (RTO.max) may be
450 * used to provide an upper bound to this doubling operation.
451 */
452 transport->rto = min((transport->rto * 2), transport->asoc->rto_max);
453 }
454
455 /* Worker routine to handle INIT command failure. */
456 static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands,
457 struct sctp_association *asoc,
458 unsigned error)
459 {
460 struct sctp_ulpevent *event;
461
462 event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC,
463 (__u16)error, 0, 0,
464 GFP_ATOMIC);
465
466 if (event)
467 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
468 SCTP_ULPEVENT(event));
469
470 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
471 SCTP_STATE(SCTP_STATE_CLOSED));
472
473 /* SEND_FAILED sent later when cleaning up the association. */
474 asoc->outqueue.error = error;
475 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
476 }
477
478 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
479 static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands,
480 struct sctp_association *asoc,
481 sctp_event_t event_type,
482 sctp_subtype_t subtype,
483 struct sctp_chunk *chunk,
484 unsigned error)
485 {
486 struct sctp_ulpevent *event;
487
488 /* Cancel any partial delivery in progress. */
489 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
490
491 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
492 (__u16)error, 0, 0,
493 GFP_ATOMIC);
494 if (event)
495 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
496 SCTP_ULPEVENT(event));
497
498 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
499 SCTP_STATE(SCTP_STATE_CLOSED));
500
501 /* Set sk_err to ECONNRESET on a 1-1 style socket. */
502 if (!sctp_style(asoc->base.sk, UDP))
503 asoc->base.sk->sk_err = ECONNRESET;
504
505 /* SEND_FAILED sent later when cleaning up the association. */
506 asoc->outqueue.error = error;
507 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
508 }
509
510 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
511 * inside the cookie. In reality, this is only used for INIT-ACK processing
512 * since all other cases use "temporary" associations and can do all
513 * their work in statefuns directly.
514 */
515 static int sctp_cmd_process_init(sctp_cmd_seq_t *commands,
516 struct sctp_association *asoc,
517 struct sctp_chunk *chunk,
518 sctp_init_chunk_t *peer_init,
519 gfp_t gfp)
520 {
521 int error;
522
523 /* We only process the init as a sideeffect in a single
524 * case. This is when we process the INIT-ACK. If we
525 * fail during INIT processing (due to malloc problems),
526 * just return the error and stop processing the stack.
527 */
528 if (!sctp_process_init(asoc, chunk->chunk_hdr->type,
529 sctp_source(chunk), peer_init, gfp))
530 error = -ENOMEM;
531 else
532 error = 0;
533
534 return error;
535 }
536
537 /* Helper function to break out starting up of heartbeat timers. */
538 static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds,
539 struct sctp_association *asoc)
540 {
541 struct sctp_transport *t;
542 struct list_head *pos;
543
544 /* Start a heartbeat timer for each transport on the association.
545 * hold a reference on the transport to make sure none of
546 * the needed data structures go away.
547 */
548 list_for_each(pos, &asoc->peer.transport_addr_list) {
549 t = list_entry(pos, struct sctp_transport, transports);
550
551 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
552 sctp_transport_hold(t);
553 }
554 }
555
556 static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds,
557 struct sctp_association *asoc)
558 {
559 struct sctp_transport *t;
560 struct list_head *pos;
561
562 /* Stop all heartbeat timers. */
563
564 list_for_each(pos, &asoc->peer.transport_addr_list) {
565 t = list_entry(pos, struct sctp_transport, transports);
566 if (del_timer(&t->hb_timer))
567 sctp_transport_put(t);
568 }
569 }
570
571 /* Helper function to stop any pending T3-RTX timers */
572 static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds,
573 struct sctp_association *asoc)
574 {
575 struct sctp_transport *t;
576 struct list_head *pos;
577
578 list_for_each(pos, &asoc->peer.transport_addr_list) {
579 t = list_entry(pos, struct sctp_transport, transports);
580 if (timer_pending(&t->T3_rtx_timer) &&
581 del_timer(&t->T3_rtx_timer)) {
582 sctp_transport_put(t);
583 }
584 }
585 }
586
587
588 /* Helper function to update the heartbeat timer. */
589 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds,
590 struct sctp_association *asoc,
591 struct sctp_transport *t)
592 {
593 /* Update the heartbeat timer. */
594 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
595 sctp_transport_hold(t);
596 }
597
598 /* Helper function to handle the reception of an HEARTBEAT ACK. */
599 static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
600 struct sctp_association *asoc,
601 struct sctp_transport *t,
602 struct sctp_chunk *chunk)
603 {
604 sctp_sender_hb_info_t *hbinfo;
605
606 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
607 * HEARTBEAT should clear the error counter of the destination
608 * transport address to which the HEARTBEAT was sent.
609 * The association's overall error count is also cleared.
610 */
611 t->error_count = 0;
612 t->asoc->overall_error_count = 0;
613
614 /* Mark the destination transport address as active if it is not so
615 * marked.
616 */
617 if (t->state == SCTP_INACTIVE)
618 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
619 SCTP_HEARTBEAT_SUCCESS);
620
621 /* The receiver of the HEARTBEAT ACK should also perform an
622 * RTT measurement for that destination transport address
623 * using the time value carried in the HEARTBEAT ACK chunk.
624 */
625 hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data;
626 sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at));
627 }
628
629 /* Helper function to do a transport reset at the expiry of the hearbeat
630 * timer.
631 */
632 static void sctp_cmd_transport_reset(sctp_cmd_seq_t *cmds,
633 struct sctp_association *asoc,
634 struct sctp_transport *t)
635 {
636 sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE);
637
638 /* Mark one strike against a transport. */
639 sctp_do_8_2_transport_strike(asoc, t);
640 }
641
642 /* Helper function to process the process SACK command. */
643 static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds,
644 struct sctp_association *asoc,
645 struct sctp_sackhdr *sackh)
646 {
647 int err;
648
649 if (sctp_outq_sack(&asoc->outqueue, sackh)) {
650 /* There are no more TSNs awaiting SACK. */
651 err = sctp_do_sm(SCTP_EVENT_T_OTHER,
652 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN),
653 asoc->state, asoc->ep, asoc, NULL,
654 GFP_ATOMIC);
655 } else {
656 /* Windows may have opened, so we need
657 * to check if we have DATA to transmit
658 */
659 err = sctp_outq_flush(&asoc->outqueue, 0);
660 }
661
662 return err;
663 }
664
665 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
666 * the transport for a shutdown chunk.
667 */
668 static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds,
669 struct sctp_association *asoc,
670 struct sctp_chunk *chunk)
671 {
672 struct sctp_transport *t;
673
674 t = sctp_assoc_choose_shutdown_transport(asoc);
675 asoc->shutdown_last_sent_to = t;
676 asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto;
677 chunk->transport = t;
678 }
679
680 /* Helper function to change the state of an association. */
681 static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds,
682 struct sctp_association *asoc,
683 sctp_state_t state)
684 {
685 struct sock *sk = asoc->base.sk;
686
687 asoc->state = state;
688
689 SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n",
690 asoc, sctp_state_tbl[state]);
691
692 if (sctp_style(sk, TCP)) {
693 /* Change the sk->sk_state of a TCP-style socket that has
694 * sucessfully completed a connect() call.
695 */
696 if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED))
697 sk->sk_state = SCTP_SS_ESTABLISHED;
698
699 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
700 if (sctp_state(asoc, SHUTDOWN_RECEIVED) &&
701 sctp_sstate(sk, ESTABLISHED))
702 sk->sk_shutdown |= RCV_SHUTDOWN;
703 }
704
705 if (sctp_state(asoc, COOKIE_WAIT)) {
706 /* Reset init timeouts since they may have been
707 * increased due to timer expirations.
708 */
709 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
710 asoc->rto_initial;
711 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
712 asoc->rto_initial;
713 }
714
715 if (sctp_state(asoc, ESTABLISHED) ||
716 sctp_state(asoc, CLOSED) ||
717 sctp_state(asoc, SHUTDOWN_RECEIVED)) {
718 /* Wake up any processes waiting in the asoc's wait queue in
719 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
720 */
721 if (waitqueue_active(&asoc->wait))
722 wake_up_interruptible(&asoc->wait);
723
724 /* Wake up any processes waiting in the sk's sleep queue of
725 * a TCP-style or UDP-style peeled-off socket in
726 * sctp_wait_for_accept() or sctp_wait_for_packet().
727 * For a UDP-style socket, the waiters are woken up by the
728 * notifications.
729 */
730 if (!sctp_style(sk, UDP))
731 sk->sk_state_change(sk);
732 }
733 }
734
735 /* Helper function to delete an association. */
736 static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds,
737 struct sctp_association *asoc)
738 {
739 struct sock *sk = asoc->base.sk;
740
741 /* If it is a non-temporary association belonging to a TCP-style
742 * listening socket that is not closed, do not free it so that accept()
743 * can pick it up later.
744 */
745 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) &&
746 (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK))
747 return;
748
749 sctp_unhash_established(asoc);
750 sctp_association_free(asoc);
751 }
752
753 /*
754 * ADDIP Section 4.1 ASCONF Chunk Procedures
755 * A4) Start a T-4 RTO timer, using the RTO value of the selected
756 * destination address (we use active path instead of primary path just
757 * because primary path may be inactive.
758 */
759 static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds,
760 struct sctp_association *asoc,
761 struct sctp_chunk *chunk)
762 {
763 struct sctp_transport *t;
764
765 t = asoc->peer.active_path;
766 asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto;
767 chunk->transport = t;
768 }
769
770 /* Process an incoming Operation Error Chunk. */
771 static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds,
772 struct sctp_association *asoc,
773 struct sctp_chunk *chunk)
774 {
775 struct sctp_operr_chunk *operr_chunk;
776 struct sctp_errhdr *err_hdr;
777
778 operr_chunk = (struct sctp_operr_chunk *)chunk->chunk_hdr;
779 err_hdr = &operr_chunk->err_hdr;
780
781 switch (err_hdr->cause) {
782 case SCTP_ERROR_UNKNOWN_CHUNK:
783 {
784 struct sctp_chunkhdr *unk_chunk_hdr;
785
786 unk_chunk_hdr = (struct sctp_chunkhdr *)err_hdr->variable;
787 switch (unk_chunk_hdr->type) {
788 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with an
789 * ERROR chunk reporting that it did not recognized the ASCONF
790 * chunk type, the sender of the ASCONF MUST NOT send any
791 * further ASCONF chunks and MUST stop its T-4 timer.
792 */
793 case SCTP_CID_ASCONF:
794 asoc->peer.asconf_capable = 0;
795 sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP,
796 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO));
797 break;
798 default:
799 break;
800 }
801 break;
802 }
803 default:
804 break;
805 }
806 }
807
808 /* Process variable FWDTSN chunk information. */
809 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq,
810 struct sctp_chunk *chunk)
811 {
812 struct sctp_fwdtsn_skip *skip;
813 /* Walk through all the skipped SSNs */
814 sctp_walk_fwdtsn(skip, chunk) {
815 sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn));
816 }
817
818 return;
819 }
820
821 /* Helper function to remove the association non-primary peer
822 * transports.
823 */
824 static void sctp_cmd_del_non_primary(struct sctp_association *asoc)
825 {
826 struct sctp_transport *t;
827 struct list_head *pos;
828 struct list_head *temp;
829
830 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
831 t = list_entry(pos, struct sctp_transport, transports);
832 if (!sctp_cmp_addr_exact(&t->ipaddr,
833 &asoc->peer.primary_addr)) {
834 sctp_assoc_del_peer(asoc, &t->ipaddr);
835 }
836 }
837
838 return;
839 }
840
841 /* These three macros allow us to pull the debugging code out of the
842 * main flow of sctp_do_sm() to keep attention focused on the real
843 * functionality there.
844 */
845 #define DEBUG_PRE \
846 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
847 "ep %p, %s, %s, asoc %p[%s], %s\n", \
848 ep, sctp_evttype_tbl[event_type], \
849 (*debug_fn)(subtype), asoc, \
850 sctp_state_tbl[state], state_fn->name)
851
852 #define DEBUG_POST \
853 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
854 "asoc %p, status: %s\n", \
855 asoc, sctp_status_tbl[status])
856
857 #define DEBUG_POST_SFX \
858 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
859 error, asoc, \
860 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
861 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
862
863 /*
864 * This is the master state machine processing function.
865 *
866 * If you want to understand all of lksctp, this is a
867 * good place to start.
868 */
869 int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype,
870 sctp_state_t state,
871 struct sctp_endpoint *ep,
872 struct sctp_association *asoc,
873 void *event_arg,
874 gfp_t gfp)
875 {
876 sctp_cmd_seq_t commands;
877 const sctp_sm_table_entry_t *state_fn;
878 sctp_disposition_t status;
879 int error = 0;
880 typedef const char *(printfn_t)(sctp_subtype_t);
881
882 static printfn_t *table[] = {
883 NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname,
884 };
885 printfn_t *debug_fn __attribute__ ((unused)) = table[event_type];
886
887 /* Look up the state function, run it, and then process the
888 * side effects. These three steps are the heart of lksctp.
889 */
890 state_fn = sctp_sm_lookup_event(event_type, state, subtype);
891
892 sctp_init_cmd_seq(&commands);
893
894 DEBUG_PRE;
895 status = (*state_fn->fn)(ep, asoc, subtype, event_arg, &commands);
896 DEBUG_POST;
897
898 error = sctp_side_effects(event_type, subtype, state,
899 ep, asoc, event_arg, status,
900 &commands, gfp);
901 DEBUG_POST_SFX;
902
903 return error;
904 }
905
906 #undef DEBUG_PRE
907 #undef DEBUG_POST
908
909 /*****************************************************************
910 * This the master state function side effect processing function.
911 *****************************************************************/
912 static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
913 sctp_state_t state,
914 struct sctp_endpoint *ep,
915 struct sctp_association *asoc,
916 void *event_arg,
917 sctp_disposition_t status,
918 sctp_cmd_seq_t *commands,
919 gfp_t gfp)
920 {
921 int error;
922
923 /* FIXME - Most of the dispositions left today would be categorized
924 * as "exceptional" dispositions. For those dispositions, it
925 * may not be proper to run through any of the commands at all.
926 * For example, the command interpreter might be run only with
927 * disposition SCTP_DISPOSITION_CONSUME.
928 */
929 if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state,
930 ep, asoc,
931 event_arg, status,
932 commands, gfp)))
933 goto bail;
934
935 switch (status) {
936 case SCTP_DISPOSITION_DISCARD:
937 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
938 "event_type %d, event_id %d\n",
939 state, event_type, subtype.chunk);
940 break;
941
942 case SCTP_DISPOSITION_NOMEM:
943 /* We ran out of memory, so we need to discard this
944 * packet.
945 */
946 /* BUG--we should now recover some memory, probably by
947 * reneging...
948 */
949 error = -ENOMEM;
950 break;
951
952 case SCTP_DISPOSITION_DELETE_TCB:
953 /* This should now be a command. */
954 break;
955
956 case SCTP_DISPOSITION_CONSUME:
957 case SCTP_DISPOSITION_ABORT:
958 /*
959 * We should no longer have much work to do here as the
960 * real work has been done as explicit commands above.
961 */
962 break;
963
964 case SCTP_DISPOSITION_VIOLATION:
965 printk(KERN_ERR "sctp protocol violation state %d "
966 "chunkid %d\n", state, subtype.chunk);
967 break;
968
969 case SCTP_DISPOSITION_NOT_IMPL:
970 printk(KERN_WARNING "sctp unimplemented feature in state %d, "
971 "event_type %d, event_id %d\n",
972 state, event_type, subtype.chunk);
973 break;
974
975 case SCTP_DISPOSITION_BUG:
976 printk(KERN_ERR "sctp bug in state %d, "
977 "event_type %d, event_id %d\n",
978 state, event_type, subtype.chunk);
979 BUG();
980 break;
981
982 default:
983 printk(KERN_ERR "sctp impossible disposition %d "
984 "in state %d, event_type %d, event_id %d\n",
985 status, state, event_type, subtype.chunk);
986 BUG();
987 break;
988 };
989
990 bail:
991 return error;
992 }
993
994 /********************************************************************
995 * 2nd Level Abstractions
996 ********************************************************************/
997
998 /* This is the side-effect interpreter. */
999 static int sctp_cmd_interpreter(sctp_event_t event_type,
1000 sctp_subtype_t subtype,
1001 sctp_state_t state,
1002 struct sctp_endpoint *ep,
1003 struct sctp_association *asoc,
1004 void *event_arg,
1005 sctp_disposition_t status,
1006 sctp_cmd_seq_t *commands,
1007 gfp_t gfp)
1008 {
1009 int error = 0;
1010 int force;
1011 sctp_cmd_t *cmd;
1012 struct sctp_chunk *new_obj;
1013 struct sctp_chunk *chunk = NULL;
1014 struct sctp_packet *packet;
1015 struct list_head *pos;
1016 struct timer_list *timer;
1017 unsigned long timeout;
1018 struct sctp_transport *t;
1019 struct sctp_sackhdr sackh;
1020 int local_cork = 0;
1021
1022 if (SCTP_EVENT_T_TIMEOUT != event_type)
1023 chunk = (struct sctp_chunk *) event_arg;
1024
1025 /* Note: This whole file is a huge candidate for rework.
1026 * For example, each command could either have its own handler, so
1027 * the loop would look like:
1028 * while (cmds)
1029 * cmd->handle(x, y, z)
1030 * --jgrimm
1031 */
1032 while (NULL != (cmd = sctp_next_cmd(commands))) {
1033 switch (cmd->verb) {
1034 case SCTP_CMD_NOP:
1035 /* Do nothing. */
1036 break;
1037
1038 case SCTP_CMD_NEW_ASOC:
1039 /* Register a new association. */
1040 if (local_cork) {
1041 sctp_outq_uncork(&asoc->outqueue);
1042 local_cork = 0;
1043 }
1044 asoc = cmd->obj.ptr;
1045 /* Register with the endpoint. */
1046 sctp_endpoint_add_asoc(ep, asoc);
1047 sctp_hash_established(asoc);
1048 break;
1049
1050 case SCTP_CMD_UPDATE_ASSOC:
1051 sctp_assoc_update(asoc, cmd->obj.ptr);
1052 break;
1053
1054 case SCTP_CMD_PURGE_OUTQUEUE:
1055 sctp_outq_teardown(&asoc->outqueue);
1056 break;
1057
1058 case SCTP_CMD_DELETE_TCB:
1059 if (local_cork) {
1060 sctp_outq_uncork(&asoc->outqueue);
1061 local_cork = 0;
1062 }
1063 /* Delete the current association. */
1064 sctp_cmd_delete_tcb(commands, asoc);
1065 asoc = NULL;
1066 break;
1067
1068 case SCTP_CMD_NEW_STATE:
1069 /* Enter a new state. */
1070 sctp_cmd_new_state(commands, asoc, cmd->obj.state);
1071 break;
1072
1073 case SCTP_CMD_REPORT_TSN:
1074 /* Record the arrival of a TSN. */
1075 sctp_tsnmap_mark(&asoc->peer.tsn_map, cmd->obj.u32);
1076 break;
1077
1078 case SCTP_CMD_REPORT_FWDTSN:
1079 /* Move the Cumulattive TSN Ack ahead. */
1080 sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32);
1081
1082 /* Abort any in progress partial delivery. */
1083 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
1084 break;
1085
1086 case SCTP_CMD_PROCESS_FWDTSN:
1087 sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.ptr);
1088 break;
1089
1090 case SCTP_CMD_GEN_SACK:
1091 /* Generate a Selective ACK.
1092 * The argument tells us whether to just count
1093 * the packet and MAYBE generate a SACK, or
1094 * force a SACK out.
1095 */
1096 force = cmd->obj.i32;
1097 error = sctp_gen_sack(asoc, force, commands);
1098 break;
1099
1100 case SCTP_CMD_PROCESS_SACK:
1101 /* Process an inbound SACK. */
1102 error = sctp_cmd_process_sack(commands, asoc,
1103 cmd->obj.ptr);
1104 break;
1105
1106 case SCTP_CMD_GEN_INIT_ACK:
1107 /* Generate an INIT ACK chunk. */
1108 new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC,
1109 0);
1110 if (!new_obj)
1111 goto nomem;
1112
1113 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1114 SCTP_CHUNK(new_obj));
1115 break;
1116
1117 case SCTP_CMD_PEER_INIT:
1118 /* Process a unified INIT from the peer.
1119 * Note: Only used during INIT-ACK processing. If
1120 * there is an error just return to the outter
1121 * layer which will bail.
1122 */
1123 error = sctp_cmd_process_init(commands, asoc, chunk,
1124 cmd->obj.ptr, gfp);
1125 break;
1126
1127 case SCTP_CMD_GEN_COOKIE_ECHO:
1128 /* Generate a COOKIE ECHO chunk. */
1129 new_obj = sctp_make_cookie_echo(asoc, chunk);
1130 if (!new_obj) {
1131 if (cmd->obj.ptr)
1132 sctp_chunk_free(cmd->obj.ptr);
1133 goto nomem;
1134 }
1135 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1136 SCTP_CHUNK(new_obj));
1137
1138 /* If there is an ERROR chunk to be sent along with
1139 * the COOKIE_ECHO, send it, too.
1140 */
1141 if (cmd->obj.ptr)
1142 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1143 SCTP_CHUNK(cmd->obj.ptr));
1144
1145 /* FIXME - Eventually come up with a cleaner way to
1146 * enabling COOKIE-ECHO + DATA bundling during
1147 * multihoming stale cookie scenarios, the following
1148 * command plays with asoc->peer.retran_path to
1149 * avoid the problem of sending the COOKIE-ECHO and
1150 * DATA in different paths, which could result
1151 * in the association being ABORTed if the DATA chunk
1152 * is processed first by the server. Checking the
1153 * init error counter simply causes this command
1154 * to be executed only during failed attempts of
1155 * association establishment.
1156 */
1157 if ((asoc->peer.retran_path !=
1158 asoc->peer.primary_path) &&
1159 (asoc->init_err_counter > 0)) {
1160 sctp_add_cmd_sf(commands,
1161 SCTP_CMD_FORCE_PRIM_RETRAN,
1162 SCTP_NULL());
1163 }
1164
1165 break;
1166
1167 case SCTP_CMD_GEN_SHUTDOWN:
1168 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1169 * Reset error counts.
1170 */
1171 asoc->overall_error_count = 0;
1172
1173 /* Generate a SHUTDOWN chunk. */
1174 new_obj = sctp_make_shutdown(asoc, chunk);
1175 if (!new_obj)
1176 goto nomem;
1177 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1178 SCTP_CHUNK(new_obj));
1179 break;
1180
1181 case SCTP_CMD_CHUNK_ULP:
1182 /* Send a chunk to the sockets layer. */
1183 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1184 "chunk_up:", cmd->obj.ptr,
1185 "ulpq:", &asoc->ulpq);
1186 sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.ptr,
1187 GFP_ATOMIC);
1188 break;
1189
1190 case SCTP_CMD_EVENT_ULP:
1191 /* Send a notification to the sockets layer. */
1192 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1193 "event_up:",cmd->obj.ptr,
1194 "ulpq:",&asoc->ulpq);
1195 sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ptr);
1196 break;
1197
1198 case SCTP_CMD_REPLY:
1199 /* If an caller has not already corked, do cork. */
1200 if (!asoc->outqueue.cork) {
1201 sctp_outq_cork(&asoc->outqueue);
1202 local_cork = 1;
1203 }
1204 /* Send a chunk to our peer. */
1205 error = sctp_outq_tail(&asoc->outqueue, cmd->obj.ptr);
1206 break;
1207
1208 case SCTP_CMD_SEND_PKT:
1209 /* Send a full packet to our peer. */
1210 packet = cmd->obj.ptr;
1211 sctp_packet_transmit(packet);
1212 sctp_ootb_pkt_free(packet);
1213 break;
1214
1215 case SCTP_CMD_RETRAN:
1216 /* Mark a transport for retransmission. */
1217 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1218 SCTP_RTXR_T3_RTX);
1219 break;
1220
1221 case SCTP_CMD_TRANSMIT:
1222 /* Kick start transmission. */
1223 error = sctp_outq_uncork(&asoc->outqueue);
1224 local_cork = 0;
1225 break;
1226
1227 case SCTP_CMD_ECN_CE:
1228 /* Do delayed CE processing. */
1229 sctp_do_ecn_ce_work(asoc, cmd->obj.u32);
1230 break;
1231
1232 case SCTP_CMD_ECN_ECNE:
1233 /* Do delayed ECNE processing. */
1234 new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32,
1235 chunk);
1236 if (new_obj)
1237 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1238 SCTP_CHUNK(new_obj));
1239 break;
1240
1241 case SCTP_CMD_ECN_CWR:
1242 /* Do delayed CWR processing. */
1243 sctp_do_ecn_cwr_work(asoc, cmd->obj.u32);
1244 break;
1245
1246 case SCTP_CMD_SETUP_T2:
1247 sctp_cmd_setup_t2(commands, asoc, cmd->obj.ptr);
1248 break;
1249
1250 case SCTP_CMD_TIMER_START:
1251 timer = &asoc->timers[cmd->obj.to];
1252 timeout = asoc->timeouts[cmd->obj.to];
1253 if (!timeout)
1254 BUG();
1255
1256 timer->expires = jiffies + timeout;
1257 sctp_association_hold(asoc);
1258 add_timer(timer);
1259 break;
1260
1261 case SCTP_CMD_TIMER_RESTART:
1262 timer = &asoc->timers[cmd->obj.to];
1263 timeout = asoc->timeouts[cmd->obj.to];
1264 if (!mod_timer(timer, jiffies + timeout))
1265 sctp_association_hold(asoc);
1266 break;
1267
1268 case SCTP_CMD_TIMER_STOP:
1269 timer = &asoc->timers[cmd->obj.to];
1270 if (timer_pending(timer) && del_timer(timer))
1271 sctp_association_put(asoc);
1272 break;
1273
1274 case SCTP_CMD_INIT_CHOOSE_TRANSPORT:
1275 chunk = cmd->obj.ptr;
1276 t = sctp_assoc_choose_init_transport(asoc);
1277 asoc->init_last_sent_to = t;
1278 chunk->transport = t;
1279 t->init_sent_count++;
1280 break;
1281
1282 case SCTP_CMD_INIT_RESTART:
1283 /* Do the needed accounting and updates
1284 * associated with restarting an initialization
1285 * timer. Only multiply the timeout by two if
1286 * all transports have been tried at the current
1287 * timeout.
1288 */
1289 t = asoc->init_last_sent_to;
1290 asoc->init_err_counter++;
1291
1292 if (t->init_sent_count > (asoc->init_cycle + 1)) {
1293 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] *= 2;
1294 if (asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] >
1295 asoc->max_init_timeo) {
1296 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
1297 asoc->max_init_timeo;
1298 }
1299 asoc->init_cycle++;
1300 SCTP_DEBUG_PRINTK(
1301 "T1 INIT Timeout adjustment"
1302 " init_err_counter: %d"
1303 " cycle: %d"
1304 " timeout: %d\n",
1305 asoc->init_err_counter,
1306 asoc->init_cycle,
1307 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT]);
1308 }
1309
1310 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
1311 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
1312 break;
1313
1314 case SCTP_CMD_COOKIEECHO_RESTART:
1315 /* Do the needed accounting and updates
1316 * associated with restarting an initialization
1317 * timer. Only multiply the timeout by two if
1318 * all transports have been tried at the current
1319 * timeout.
1320 */
1321 asoc->init_err_counter++;
1322
1323 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] *= 2;
1324 if (asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] >
1325 asoc->max_init_timeo) {
1326 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
1327 asoc->max_init_timeo;
1328 }
1329 SCTP_DEBUG_PRINTK(
1330 "T1 COOKIE Timeout adjustment"
1331 " init_err_counter: %d"
1332 " timeout: %d\n",
1333 asoc->init_err_counter,
1334 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE]);
1335
1336 /* If we've sent any data bundled with
1337 * COOKIE-ECHO we need to resend.
1338 */
1339 list_for_each(pos, &asoc->peer.transport_addr_list) {
1340 t = list_entry(pos, struct sctp_transport,
1341 transports);
1342 sctp_retransmit_mark(&asoc->outqueue, t, 0);
1343 }
1344
1345 sctp_add_cmd_sf(commands,
1346 SCTP_CMD_TIMER_RESTART,
1347 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE));
1348 break;
1349
1350 case SCTP_CMD_INIT_FAILED:
1351 sctp_cmd_init_failed(commands, asoc, cmd->obj.u32);
1352 break;
1353
1354 case SCTP_CMD_ASSOC_FAILED:
1355 sctp_cmd_assoc_failed(commands, asoc, event_type,
1356 subtype, chunk, cmd->obj.u32);
1357 break;
1358
1359 case SCTP_CMD_INIT_COUNTER_INC:
1360 asoc->init_err_counter++;
1361 break;
1362
1363 case SCTP_CMD_INIT_COUNTER_RESET:
1364 asoc->init_err_counter = 0;
1365 asoc->init_cycle = 0;
1366 break;
1367
1368 case SCTP_CMD_REPORT_DUP:
1369 sctp_tsnmap_mark_dup(&asoc->peer.tsn_map,
1370 cmd->obj.u32);
1371 break;
1372
1373 case SCTP_CMD_REPORT_BAD_TAG:
1374 SCTP_DEBUG_PRINTK("vtag mismatch!\n");
1375 break;
1376
1377 case SCTP_CMD_STRIKE:
1378 /* Mark one strike against a transport. */
1379 sctp_do_8_2_transport_strike(asoc, cmd->obj.transport);
1380 break;
1381
1382 case SCTP_CMD_TRANSPORT_RESET:
1383 t = cmd->obj.transport;
1384 sctp_cmd_transport_reset(commands, asoc, t);
1385 break;
1386
1387 case SCTP_CMD_TRANSPORT_ON:
1388 t = cmd->obj.transport;
1389 sctp_cmd_transport_on(commands, asoc, t, chunk);
1390 break;
1391
1392 case SCTP_CMD_HB_TIMERS_START:
1393 sctp_cmd_hb_timers_start(commands, asoc);
1394 break;
1395
1396 case SCTP_CMD_HB_TIMER_UPDATE:
1397 t = cmd->obj.transport;
1398 sctp_cmd_hb_timer_update(commands, asoc, t);
1399 break;
1400
1401 case SCTP_CMD_HB_TIMERS_STOP:
1402 sctp_cmd_hb_timers_stop(commands, asoc);
1403 break;
1404
1405 case SCTP_CMD_REPORT_ERROR:
1406 error = cmd->obj.error;
1407 break;
1408
1409 case SCTP_CMD_PROCESS_CTSN:
1410 /* Dummy up a SACK for processing. */
1411 sackh.cum_tsn_ack = cmd->obj.u32;
1412 sackh.a_rwnd = 0;
1413 sackh.num_gap_ack_blocks = 0;
1414 sackh.num_dup_tsns = 0;
1415 sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK,
1416 SCTP_SACKH(&sackh));
1417 break;
1418
1419 case SCTP_CMD_DISCARD_PACKET:
1420 /* We need to discard the whole packet. */
1421 chunk->pdiscard = 1;
1422 break;
1423
1424 case SCTP_CMD_RTO_PENDING:
1425 t = cmd->obj.transport;
1426 t->rto_pending = 1;
1427 break;
1428
1429 case SCTP_CMD_PART_DELIVER:
1430 sctp_ulpq_partial_delivery(&asoc->ulpq, cmd->obj.ptr,
1431 GFP_ATOMIC);
1432 break;
1433
1434 case SCTP_CMD_RENEGE:
1435 sctp_ulpq_renege(&asoc->ulpq, cmd->obj.ptr,
1436 GFP_ATOMIC);
1437 break;
1438
1439 case SCTP_CMD_SETUP_T4:
1440 sctp_cmd_setup_t4(commands, asoc, cmd->obj.ptr);
1441 break;
1442
1443 case SCTP_CMD_PROCESS_OPERR:
1444 sctp_cmd_process_operr(commands, asoc, chunk);
1445 break;
1446 case SCTP_CMD_CLEAR_INIT_TAG:
1447 asoc->peer.i.init_tag = 0;
1448 break;
1449 case SCTP_CMD_DEL_NON_PRIMARY:
1450 sctp_cmd_del_non_primary(asoc);
1451 break;
1452 case SCTP_CMD_T3_RTX_TIMERS_STOP:
1453 sctp_cmd_t3_rtx_timers_stop(commands, asoc);
1454 break;
1455 case SCTP_CMD_FORCE_PRIM_RETRAN:
1456 t = asoc->peer.retran_path;
1457 asoc->peer.retran_path = asoc->peer.primary_path;
1458 error = sctp_outq_uncork(&asoc->outqueue);
1459 local_cork = 0;
1460 asoc->peer.retran_path = t;
1461 break;
1462 default:
1463 printk(KERN_WARNING "Impossible command: %u, %p\n",
1464 cmd->verb, cmd->obj.ptr);
1465 break;
1466 };
1467 if (error)
1468 break;
1469 }
1470
1471 out:
1472 if (local_cork)
1473 sctp_outq_uncork(&asoc->outqueue);
1474 return error;
1475 nomem:
1476 error = -ENOMEM;
1477 goto out;
1478 }
1479
kernel source for telekom puls (alcatel/mediatek)