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60c778b2 1/* SCTP kernel implementation
1da177e4
LT
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 *
60c778b2 6 * This file is part of the SCTP kernel implementation
1da177e4
LT
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 *
60c778b2 12 * This SCTP implementation is free software;
1da177e4
LT
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 *
60c778b2 18 * This SCTP implementation is distributed in the hope that it
1da177e4
LT
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,
d808ad9a 64 sctp_disposition_t status,
1da177e4 65 sctp_cmd_seq_t *commands,
dd0fc66f 66 gfp_t gfp);
1da177e4
LT
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,
dd0fc66f 74 gfp_t gfp);
1da177e4
LT
75
76/********************************************************************
77 * Helper functions
78 ********************************************************************/
79
80/* A helper function for delayed processing of INET ECN CE bit. */
d808ad9a 81static void sctp_do_ecn_ce_work(struct sctp_association *asoc,
1da177e4
LT
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;
52ccb8e9 160 struct sctp_transport *trans = asoc->peer.last_data_from;
1da177e4
LT
161 int error = 0;
162
d808ad9a 163 if (force ||
52ccb8e9
FF
164 (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) ||
165 (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE)))
1da177e4
LT
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 */
d808ad9a 181 if (max_tsn_seen != ctsn)
1da177e4
LT
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;
52ccb8e9
FF
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)
d808ad9a 202 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
52ccb8e9
FF
203 trans->sackdelay;
204 else
d808ad9a 205 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
52ccb8e9
FF
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));
1da177e4
LT
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
732ba35e 220 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack));
1da177e4
LT
221
222 /* Stop the SACK timer. */
223 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
224 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
225 }
52ccb8e9 226
1da177e4
LT
227 return error;
228nomem:
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 */
236void 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
270out_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 */
278static 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
310out_unlock:
311 sctp_bh_unlock_sock(asoc->base.sk);
312 sctp_association_put(asoc);
313}
314
315static 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
321static 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
327static 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
333static 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
339static void sctp_generate_t5_shutdown_guard_event(unsigned long data)
340{
d808ad9a
YH
341 struct sctp_association *asoc = (struct sctp_association *)data;
342 sctp_generate_timeout_event(asoc,
1da177e4
LT
343 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD);
344
345} /* sctp_generate_t5_shutdown_guard_event() */
346
347static 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 */
356void 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
d808ad9a 383 if (error)
1da177e4
LT
384 asoc->base.sk->sk_err = -error;
385
386out_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. */
392static 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
398sctp_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,
1e7d3d90 406 NULL,
1da177e4
LT
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 */
427static 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 */
ad8fec17
SS
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++;
1da177e4 438
3f7a87d2 439 if (transport->state != SCTP_INACTIVE &&
52ccb8e9 440 (transport->error_count++ >= transport->pathmaxrxt)) {
3f7a87d2
FF
441 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
442 " transport IP: port:%d failed.\n",
443 asoc,
b3f5b3b6
AV
444 (&transport->ipaddr),
445 ntohs(transport->ipaddr.v4.sin_port));
1da177e4
LT
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 */
b6157d8e 456 transport->last_rto = transport->rto;
1da177e4
LT
457 transport->rto = min((transport->rto * 2), transport->asoc->rto_max);
458}
459
460/* Worker routine to handle INIT command failure. */
461static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands,
462 struct sctp_association *asoc,
463 unsigned error)
464{
465 struct sctp_ulpevent *event;
466
467 event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC,
a5a35e76 468 (__u16)error, 0, 0, NULL,
1da177e4
LT
469 GFP_ATOMIC);
470
471 if (event)
472 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
473 SCTP_ULPEVENT(event));
474
475 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
476 SCTP_STATE(SCTP_STATE_CLOSED));
477
478 /* SEND_FAILED sent later when cleaning up the association. */
479 asoc->outqueue.error = error;
480 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
481}
482
483/* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
484static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands,
485 struct sctp_association *asoc,
486 sctp_event_t event_type,
487 sctp_subtype_t subtype,
488 struct sctp_chunk *chunk,
489 unsigned error)
490{
491 struct sctp_ulpevent *event;
492
493 /* Cancel any partial delivery in progress. */
494 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
495
a5a35e76
VY
496 if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT)
497 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
498 (__u16)error, 0, 0, chunk,
499 GFP_ATOMIC);
500 else
501 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
502 (__u16)error, 0, 0, NULL,
1da177e4
LT
503 GFP_ATOMIC);
504 if (event)
505 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
506 SCTP_ULPEVENT(event));
507
508 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
509 SCTP_STATE(SCTP_STATE_CLOSED));
510
1da177e4
LT
511 /* SEND_FAILED sent later when cleaning up the association. */
512 asoc->outqueue.error = error;
513 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
514}
515
516/* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
517 * inside the cookie. In reality, this is only used for INIT-ACK processing
518 * since all other cases use "temporary" associations and can do all
519 * their work in statefuns directly.
520 */
521static int sctp_cmd_process_init(sctp_cmd_seq_t *commands,
522 struct sctp_association *asoc,
523 struct sctp_chunk *chunk,
3182cd84 524 sctp_init_chunk_t *peer_init,
dd0fc66f 525 gfp_t gfp)
1da177e4
LT
526{
527 int error;
528
529 /* We only process the init as a sideeffect in a single
530 * case. This is when we process the INIT-ACK. If we
531 * fail during INIT processing (due to malloc problems),
532 * just return the error and stop processing the stack.
533 */
534 if (!sctp_process_init(asoc, chunk->chunk_hdr->type,
535 sctp_source(chunk), peer_init, gfp))
536 error = -ENOMEM;
537 else
538 error = 0;
539
540 return error;
541}
542
543/* Helper function to break out starting up of heartbeat timers. */
544static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds,
545 struct sctp_association *asoc)
546{
547 struct sctp_transport *t;
548 struct list_head *pos;
549
550 /* Start a heartbeat timer for each transport on the association.
551 * hold a reference on the transport to make sure none of
552 * the needed data structures go away.
553 */
554 list_for_each(pos, &asoc->peer.transport_addr_list) {
555 t = list_entry(pos, struct sctp_transport, transports);
556
557 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
558 sctp_transport_hold(t);
559 }
560}
561
562static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds,
563 struct sctp_association *asoc)
564{
565 struct sctp_transport *t;
566 struct list_head *pos;
567
568 /* Stop all heartbeat timers. */
569
570 list_for_each(pos, &asoc->peer.transport_addr_list) {
571 t = list_entry(pos, struct sctp_transport, transports);
572 if (del_timer(&t->hb_timer))
573 sctp_transport_put(t);
574 }
575}
576
577/* Helper function to stop any pending T3-RTX timers */
578static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds,
d808ad9a 579 struct sctp_association *asoc)
1da177e4
LT
580{
581 struct sctp_transport *t;
582 struct list_head *pos;
583
584 list_for_each(pos, &asoc->peer.transport_addr_list) {
585 t = list_entry(pos, struct sctp_transport, transports);
586 if (timer_pending(&t->T3_rtx_timer) &&
587 del_timer(&t->T3_rtx_timer)) {
588 sctp_transport_put(t);
589 }
590 }
591}
592
593
594/* Helper function to update the heartbeat timer. */
595static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds,
596 struct sctp_association *asoc,
597 struct sctp_transport *t)
598{
599 /* Update the heartbeat timer. */
600 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
601 sctp_transport_hold(t);
602}
603
604/* Helper function to handle the reception of an HEARTBEAT ACK. */
605static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
606 struct sctp_association *asoc,
607 struct sctp_transport *t,
608 struct sctp_chunk *chunk)
609{
610 sctp_sender_hb_info_t *hbinfo;
611
612 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
613 * HEARTBEAT should clear the error counter of the destination
614 * transport address to which the HEARTBEAT was sent.
615 * The association's overall error count is also cleared.
616 */
617 t->error_count = 0;
618 t->asoc->overall_error_count = 0;
619
620 /* Mark the destination transport address as active if it is not so
621 * marked.
622 */
ad8fec17 623 if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED))
1da177e4
LT
624 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
625 SCTP_HEARTBEAT_SUCCESS);
626
627 /* The receiver of the HEARTBEAT ACK should also perform an
628 * RTT measurement for that destination transport address
629 * using the time value carried in the HEARTBEAT ACK chunk.
e533ca16
VY
630 * If the transport's rto_pending variable has been cleared,
631 * it was most likely due to a retransmit. However, we want
632 * to re-enable it to properly update the rto.
1da177e4 633 */
e533ca16
VY
634 if (t->rto_pending == 0)
635 t->rto_pending = 1;
636
1da177e4
LT
637 hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data;
638 sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at));
ad8fec17
SS
639
640 /* Update the heartbeat timer. */
641 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
642 sctp_transport_hold(t);
1da177e4
LT
643}
644
645/* Helper function to do a transport reset at the expiry of the hearbeat
646 * timer.
647 */
648static void sctp_cmd_transport_reset(sctp_cmd_seq_t *cmds,
649 struct sctp_association *asoc,
650 struct sctp_transport *t)
651{
652 sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE);
653
654 /* Mark one strike against a transport. */
655 sctp_do_8_2_transport_strike(asoc, t);
656}
657
658/* Helper function to process the process SACK command. */
659static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds,
660 struct sctp_association *asoc,
661 struct sctp_sackhdr *sackh)
662{
663 int err;
664
665 if (sctp_outq_sack(&asoc->outqueue, sackh)) {
666 /* There are no more TSNs awaiting SACK. */
667 err = sctp_do_sm(SCTP_EVENT_T_OTHER,
668 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN),
669 asoc->state, asoc->ep, asoc, NULL,
670 GFP_ATOMIC);
671 } else {
672 /* Windows may have opened, so we need
673 * to check if we have DATA to transmit
674 */
675 err = sctp_outq_flush(&asoc->outqueue, 0);
676 }
677
678 return err;
679}
680
681/* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
682 * the transport for a shutdown chunk.
683 */
d808ad9a 684static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds,
1da177e4
LT
685 struct sctp_association *asoc,
686 struct sctp_chunk *chunk)
687{
688 struct sctp_transport *t;
689
690 t = sctp_assoc_choose_shutdown_transport(asoc);
691 asoc->shutdown_last_sent_to = t;
692 asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto;
693 chunk->transport = t;
694}
695
696/* Helper function to change the state of an association. */
d808ad9a 697static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds,
1da177e4
LT
698 struct sctp_association *asoc,
699 sctp_state_t state)
700{
701 struct sock *sk = asoc->base.sk;
702
703 asoc->state = state;
704
3f7a87d2
FF
705 SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n",
706 asoc, sctp_state_tbl[state]);
707
1da177e4 708 if (sctp_style(sk, TCP)) {
3f7a87d2 709 /* Change the sk->sk_state of a TCP-style socket that has
1da177e4
LT
710 * sucessfully completed a connect() call.
711 */
712 if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED))
713 sk->sk_state = SCTP_SS_ESTABLISHED;
714
715 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
716 if (sctp_state(asoc, SHUTDOWN_RECEIVED) &&
717 sctp_sstate(sk, ESTABLISHED))
718 sk->sk_shutdown |= RCV_SHUTDOWN;
719 }
720
3f7a87d2
FF
721 if (sctp_state(asoc, COOKIE_WAIT)) {
722 /* Reset init timeouts since they may have been
723 * increased due to timer expirations.
724 */
725 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
1e7d3d90 726 asoc->rto_initial;
3f7a87d2 727 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
1e7d3d90 728 asoc->rto_initial;
3f7a87d2
FF
729 }
730
1da177e4
LT
731 if (sctp_state(asoc, ESTABLISHED) ||
732 sctp_state(asoc, CLOSED) ||
733 sctp_state(asoc, SHUTDOWN_RECEIVED)) {
734 /* Wake up any processes waiting in the asoc's wait queue in
735 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
d808ad9a 736 */
1da177e4
LT
737 if (waitqueue_active(&asoc->wait))
738 wake_up_interruptible(&asoc->wait);
739
740 /* Wake up any processes waiting in the sk's sleep queue of
741 * a TCP-style or UDP-style peeled-off socket in
742 * sctp_wait_for_accept() or sctp_wait_for_packet().
743 * For a UDP-style socket, the waiters are woken up by the
744 * notifications.
745 */
746 if (!sctp_style(sk, UDP))
747 sk->sk_state_change(sk);
748 }
749}
750
751/* Helper function to delete an association. */
752static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds,
753 struct sctp_association *asoc)
754{
755 struct sock *sk = asoc->base.sk;
756
757 /* If it is a non-temporary association belonging to a TCP-style
d808ad9a 758 * listening socket that is not closed, do not free it so that accept()
1da177e4 759 * can pick it up later.
d808ad9a 760 */
1da177e4
LT
761 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) &&
762 (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK))
763 return;
764
765 sctp_unhash_established(asoc);
766 sctp_association_free(asoc);
767}
768
769/*
770 * ADDIP Section 4.1 ASCONF Chunk Procedures
771 * A4) Start a T-4 RTO timer, using the RTO value of the selected
772 * destination address (we use active path instead of primary path just
d808ad9a 773 * because primary path may be inactive.
1da177e4
LT
774 */
775static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds,
776 struct sctp_association *asoc,
777 struct sctp_chunk *chunk)
778{
779 struct sctp_transport *t;
780
781 t = asoc->peer.active_path;
782 asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto;
783 chunk->transport = t;
784}
785
d808ad9a 786/* Process an incoming Operation Error Chunk. */
1da177e4
LT
787static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds,
788 struct sctp_association *asoc,
789 struct sctp_chunk *chunk)
790{
791 struct sctp_operr_chunk *operr_chunk;
792 struct sctp_errhdr *err_hdr;
793
794 operr_chunk = (struct sctp_operr_chunk *)chunk->chunk_hdr;
795 err_hdr = &operr_chunk->err_hdr;
796
797 switch (err_hdr->cause) {
798 case SCTP_ERROR_UNKNOWN_CHUNK:
799 {
800 struct sctp_chunkhdr *unk_chunk_hdr;
801
802 unk_chunk_hdr = (struct sctp_chunkhdr *)err_hdr->variable;
803 switch (unk_chunk_hdr->type) {
804 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with an
805 * ERROR chunk reporting that it did not recognized the ASCONF
806 * chunk type, the sender of the ASCONF MUST NOT send any
807 * further ASCONF chunks and MUST stop its T-4 timer.
808 */
809 case SCTP_CID_ASCONF:
810 asoc->peer.asconf_capable = 0;
811 sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP,
812 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO));
813 break;
814 default:
815 break;
816 }
817 break;
818 }
819 default:
820 break;
821 }
822}
823
824/* Process variable FWDTSN chunk information. */
d808ad9a 825static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq,
1da177e4
LT
826 struct sctp_chunk *chunk)
827{
828 struct sctp_fwdtsn_skip *skip;
829 /* Walk through all the skipped SSNs */
830 sctp_walk_fwdtsn(skip, chunk) {
831 sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn));
832 }
833
834 return;
835}
836
d808ad9a 837/* Helper function to remove the association non-primary peer
1da177e4 838 * transports.
d808ad9a 839 */
1da177e4
LT
840static void sctp_cmd_del_non_primary(struct sctp_association *asoc)
841{
842 struct sctp_transport *t;
843 struct list_head *pos;
844 struct list_head *temp;
845
846 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
847 t = list_entry(pos, struct sctp_transport, transports);
5f242a13 848 if (!sctp_cmp_addr_exact(&t->ipaddr,
d808ad9a 849 &asoc->peer.primary_addr)) {
38a03145 850 sctp_assoc_del_peer(asoc, &t->ipaddr);
1da177e4
LT
851 }
852 }
853
854 return;
855}
856
8de8c873
SS
857/* Helper function to set sk_err on a 1-1 style socket. */
858static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error)
859{
860 struct sock *sk = asoc->base.sk;
861
862 if (!sctp_style(sk, UDP))
863 sk->sk_err = error;
864}
865
07d93967
VY
866/* Helper function to generate an association change event */
867static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands,
868 struct sctp_association *asoc,
869 u8 state)
870{
871 struct sctp_ulpevent *ev;
872
873 ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0,
874 asoc->c.sinit_num_ostreams,
875 asoc->c.sinit_max_instreams,
876 NULL, GFP_ATOMIC);
877 if (ev)
878 sctp_ulpq_tail_event(&asoc->ulpq, ev);
879}
880
881/* Helper function to generate an adaptation indication event */
882static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands,
883 struct sctp_association *asoc)
884{
885 struct sctp_ulpevent *ev;
886
887 ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC);
888
889 if (ev)
890 sctp_ulpq_tail_event(&asoc->ulpq, ev);
891}
892
1da177e4
LT
893/* These three macros allow us to pull the debugging code out of the
894 * main flow of sctp_do_sm() to keep attention focused on the real
895 * functionality there.
896 */
897#define DEBUG_PRE \
898 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
899 "ep %p, %s, %s, asoc %p[%s], %s\n", \
900 ep, sctp_evttype_tbl[event_type], \
901 (*debug_fn)(subtype), asoc, \
902 sctp_state_tbl[state], state_fn->name)
903
904#define DEBUG_POST \
905 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
906 "asoc %p, status: %s\n", \
907 asoc, sctp_status_tbl[status])
908
909#define DEBUG_POST_SFX \
910 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
911 error, asoc, \
912 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
913 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
914
915/*
916 * This is the master state machine processing function.
917 *
918 * If you want to understand all of lksctp, this is a
919 * good place to start.
920 */
921int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype,
922 sctp_state_t state,
923 struct sctp_endpoint *ep,
924 struct sctp_association *asoc,
925 void *event_arg,
dd0fc66f 926 gfp_t gfp)
1da177e4
LT
927{
928 sctp_cmd_seq_t commands;
929 const sctp_sm_table_entry_t *state_fn;
930 sctp_disposition_t status;
931 int error = 0;
932 typedef const char *(printfn_t)(sctp_subtype_t);
933
934 static printfn_t *table[] = {
935 NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname,
936 };
937 printfn_t *debug_fn __attribute__ ((unused)) = table[event_type];
938
939 /* Look up the state function, run it, and then process the
940 * side effects. These three steps are the heart of lksctp.
941 */
942 state_fn = sctp_sm_lookup_event(event_type, state, subtype);
943
944 sctp_init_cmd_seq(&commands);
945
946 DEBUG_PRE;
947 status = (*state_fn->fn)(ep, asoc, subtype, event_arg, &commands);
948 DEBUG_POST;
949
950 error = sctp_side_effects(event_type, subtype, state,
d808ad9a 951 ep, asoc, event_arg, status,
1da177e4
LT
952 &commands, gfp);
953 DEBUG_POST_SFX;
954
955 return error;
956}
957
958#undef DEBUG_PRE
959#undef DEBUG_POST
960
961/*****************************************************************
962 * This the master state function side effect processing function.
963 *****************************************************************/
964static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
965 sctp_state_t state,
966 struct sctp_endpoint *ep,
967 struct sctp_association *asoc,
968 void *event_arg,
969 sctp_disposition_t status,
970 sctp_cmd_seq_t *commands,
dd0fc66f 971 gfp_t gfp)
1da177e4
LT
972{
973 int error;
974
975 /* FIXME - Most of the dispositions left today would be categorized
976 * as "exceptional" dispositions. For those dispositions, it
977 * may not be proper to run through any of the commands at all.
978 * For example, the command interpreter might be run only with
979 * disposition SCTP_DISPOSITION_CONSUME.
980 */
981 if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state,
982 ep, asoc,
983 event_arg, status,
984 commands, gfp)))
985 goto bail;
986
987 switch (status) {
988 case SCTP_DISPOSITION_DISCARD:
989 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
990 "event_type %d, event_id %d\n",
991 state, event_type, subtype.chunk);
992 break;
993
994 case SCTP_DISPOSITION_NOMEM:
995 /* We ran out of memory, so we need to discard this
996 * packet.
997 */
998 /* BUG--we should now recover some memory, probably by
999 * reneging...
1000 */
1001 error = -ENOMEM;
1002 break;
1003
d808ad9a 1004 case SCTP_DISPOSITION_DELETE_TCB:
1da177e4
LT
1005 /* This should now be a command. */
1006 break;
1007
1008 case SCTP_DISPOSITION_CONSUME:
1009 case SCTP_DISPOSITION_ABORT:
1010 /*
1011 * We should no longer have much work to do here as the
1012 * real work has been done as explicit commands above.
1013 */
1014 break;
1015
1016 case SCTP_DISPOSITION_VIOLATION:
d99fa429
WY
1017 if (net_ratelimit())
1018 printk(KERN_ERR "sctp protocol violation state %d "
1019 "chunkid %d\n", state, subtype.chunk);
1da177e4
LT
1020 break;
1021
1022 case SCTP_DISPOSITION_NOT_IMPL:
1023 printk(KERN_WARNING "sctp unimplemented feature in state %d, "
1024 "event_type %d, event_id %d\n",
1025 state, event_type, subtype.chunk);
1026 break;
1027
1028 case SCTP_DISPOSITION_BUG:
1029 printk(KERN_ERR "sctp bug in state %d, "
1030 "event_type %d, event_id %d\n",
1031 state, event_type, subtype.chunk);
1032 BUG();
1033 break;
1034
1035 default:
1036 printk(KERN_ERR "sctp impossible disposition %d "
1037 "in state %d, event_type %d, event_id %d\n",
1038 status, state, event_type, subtype.chunk);
1039 BUG();
1040 break;
3ff50b79 1041 }
1da177e4
LT
1042
1043bail:
1044 return error;
1045}
1046
1047/********************************************************************
1048 * 2nd Level Abstractions
1049 ********************************************************************/
1050
1051/* This is the side-effect interpreter. */
1052static int sctp_cmd_interpreter(sctp_event_t event_type,
1053 sctp_subtype_t subtype,
1054 sctp_state_t state,
1055 struct sctp_endpoint *ep,
1056 struct sctp_association *asoc,
1057 void *event_arg,
d808ad9a 1058 sctp_disposition_t status,
1da177e4 1059 sctp_cmd_seq_t *commands,
dd0fc66f 1060 gfp_t gfp)
1da177e4
LT
1061{
1062 int error = 0;
1063 int force;
1064 sctp_cmd_t *cmd;
1065 struct sctp_chunk *new_obj;
1066 struct sctp_chunk *chunk = NULL;
1067 struct sctp_packet *packet;
1068 struct list_head *pos;
1069 struct timer_list *timer;
1070 unsigned long timeout;
1071 struct sctp_transport *t;
1072 struct sctp_sackhdr sackh;
1073 int local_cork = 0;
1074
1075 if (SCTP_EVENT_T_TIMEOUT != event_type)
1076 chunk = (struct sctp_chunk *) event_arg;
1077
1078 /* Note: This whole file is a huge candidate for rework.
1079 * For example, each command could either have its own handler, so
1080 * the loop would look like:
1081 * while (cmds)
1082 * cmd->handle(x, y, z)
1083 * --jgrimm
1084 */
1085 while (NULL != (cmd = sctp_next_cmd(commands))) {
1086 switch (cmd->verb) {
1087 case SCTP_CMD_NOP:
1088 /* Do nothing. */
1089 break;
1090
1091 case SCTP_CMD_NEW_ASOC:
1092 /* Register a new association. */
1093 if (local_cork) {
d808ad9a 1094 sctp_outq_uncork(&asoc->outqueue);
1da177e4
LT
1095 local_cork = 0;
1096 }
1097 asoc = cmd->obj.ptr;
1098 /* Register with the endpoint. */
1099 sctp_endpoint_add_asoc(ep, asoc);
1100 sctp_hash_established(asoc);
1101 break;
1102
1103 case SCTP_CMD_UPDATE_ASSOC:
1104 sctp_assoc_update(asoc, cmd->obj.ptr);
1105 break;
1106
1107 case SCTP_CMD_PURGE_OUTQUEUE:
1108 sctp_outq_teardown(&asoc->outqueue);
1109 break;
1110
d808ad9a 1111 case SCTP_CMD_DELETE_TCB:
1da177e4
LT
1112 if (local_cork) {
1113 sctp_outq_uncork(&asoc->outqueue);
1114 local_cork = 0;
1115 }
1116 /* Delete the current association. */
1117 sctp_cmd_delete_tcb(commands, asoc);
1118 asoc = NULL;
1119 break;
1120
1121 case SCTP_CMD_NEW_STATE:
1122 /* Enter a new state. */
1123 sctp_cmd_new_state(commands, asoc, cmd->obj.state);
1124 break;
1125
1126 case SCTP_CMD_REPORT_TSN:
1127 /* Record the arrival of a TSN. */
1128 sctp_tsnmap_mark(&asoc->peer.tsn_map, cmd->obj.u32);
1129 break;
1130
1131 case SCTP_CMD_REPORT_FWDTSN:
1132 /* Move the Cumulattive TSN Ack ahead. */
1133 sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32);
1134
ea2dfb37
VY
1135 /* purge the fragmentation queue */
1136 sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32);
1137
1da177e4
LT
1138 /* Abort any in progress partial delivery. */
1139 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
1140 break;
1141
1142 case SCTP_CMD_PROCESS_FWDTSN:
1143 sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.ptr);
d808ad9a 1144 break;
1da177e4
LT
1145
1146 case SCTP_CMD_GEN_SACK:
1147 /* Generate a Selective ACK.
1148 * The argument tells us whether to just count
1149 * the packet and MAYBE generate a SACK, or
1150 * force a SACK out.
1151 */
1152 force = cmd->obj.i32;
1153 error = sctp_gen_sack(asoc, force, commands);
1154 break;
1155
1156 case SCTP_CMD_PROCESS_SACK:
1157 /* Process an inbound SACK. */
1158 error = sctp_cmd_process_sack(commands, asoc,
1159 cmd->obj.ptr);
1160 break;
1161
1162 case SCTP_CMD_GEN_INIT_ACK:
1163 /* Generate an INIT ACK chunk. */
1164 new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC,
1165 0);
1166 if (!new_obj)
1167 goto nomem;
1168
1169 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1170 SCTP_CHUNK(new_obj));
1171 break;
1172
1173 case SCTP_CMD_PEER_INIT:
1174 /* Process a unified INIT from the peer.
1175 * Note: Only used during INIT-ACK processing. If
1176 * there is an error just return to the outter
1177 * layer which will bail.
1178 */
1179 error = sctp_cmd_process_init(commands, asoc, chunk,
1180 cmd->obj.ptr, gfp);
1181 break;
1182
1183 case SCTP_CMD_GEN_COOKIE_ECHO:
1184 /* Generate a COOKIE ECHO chunk. */
1185 new_obj = sctp_make_cookie_echo(asoc, chunk);
1186 if (!new_obj) {
1187 if (cmd->obj.ptr)
1188 sctp_chunk_free(cmd->obj.ptr);
1189 goto nomem;
1190 }
1191 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1192 SCTP_CHUNK(new_obj));
1193
1194 /* If there is an ERROR chunk to be sent along with
1195 * the COOKIE_ECHO, send it, too.
1196 */
1197 if (cmd->obj.ptr)
1198 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1199 SCTP_CHUNK(cmd->obj.ptr));
1200
1201 /* FIXME - Eventually come up with a cleaner way to
d808ad9a
YH
1202 * enabling COOKIE-ECHO + DATA bundling during
1203 * multihoming stale cookie scenarios, the following
1204 * command plays with asoc->peer.retran_path to
1205 * avoid the problem of sending the COOKIE-ECHO and
1206 * DATA in different paths, which could result
1207 * in the association being ABORTed if the DATA chunk
1da177e4
LT
1208 * is processed first by the server. Checking the
1209 * init error counter simply causes this command
1210 * to be executed only during failed attempts of
1211 * association establishment.
1212 */
3f7a87d2
FF
1213 if ((asoc->peer.retran_path !=
1214 asoc->peer.primary_path) &&
1215 (asoc->init_err_counter > 0)) {
1216 sctp_add_cmd_sf(commands,
d808ad9a 1217 SCTP_CMD_FORCE_PRIM_RETRAN,
1da177e4
LT
1218 SCTP_NULL());
1219 }
1220
1221 break;
1222
1223 case SCTP_CMD_GEN_SHUTDOWN:
1224 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1225 * Reset error counts.
1226 */
1227 asoc->overall_error_count = 0;
1228
1229 /* Generate a SHUTDOWN chunk. */
1230 new_obj = sctp_make_shutdown(asoc, chunk);
1231 if (!new_obj)
1232 goto nomem;
1233 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1234 SCTP_CHUNK(new_obj));
1235 break;
1236
1237 case SCTP_CMD_CHUNK_ULP:
1238 /* Send a chunk to the sockets layer. */
1239 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1240 "chunk_up:", cmd->obj.ptr,
1241 "ulpq:", &asoc->ulpq);
1242 sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.ptr,
1243 GFP_ATOMIC);
1244 break;
1245
1246 case SCTP_CMD_EVENT_ULP:
1247 /* Send a notification to the sockets layer. */
1248 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1249 "event_up:",cmd->obj.ptr,
1250 "ulpq:",&asoc->ulpq);
1251 sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ptr);
1252 break;
1253
1254 case SCTP_CMD_REPLY:
1255 /* If an caller has not already corked, do cork. */
1256 if (!asoc->outqueue.cork) {
1257 sctp_outq_cork(&asoc->outqueue);
1258 local_cork = 1;
1259 }
1260 /* Send a chunk to our peer. */
1261 error = sctp_outq_tail(&asoc->outqueue, cmd->obj.ptr);
1262 break;
1263
1264 case SCTP_CMD_SEND_PKT:
1265 /* Send a full packet to our peer. */
1266 packet = cmd->obj.ptr;
1267 sctp_packet_transmit(packet);
1268 sctp_ootb_pkt_free(packet);
1269 break;
1270
b6157d8e
VY
1271 case SCTP_CMD_T1_RETRAN:
1272 /* Mark a transport for retransmission. */
1273 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1274 SCTP_RTXR_T1_RTX);
1275 break;
1276
1da177e4
LT
1277 case SCTP_CMD_RETRAN:
1278 /* Mark a transport for retransmission. */
1279 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1280 SCTP_RTXR_T3_RTX);
1281 break;
1282
1283 case SCTP_CMD_TRANSMIT:
1284 /* Kick start transmission. */
1285 error = sctp_outq_uncork(&asoc->outqueue);
1286 local_cork = 0;
1287 break;
1288
1289 case SCTP_CMD_ECN_CE:
1290 /* Do delayed CE processing. */
1291 sctp_do_ecn_ce_work(asoc, cmd->obj.u32);
1292 break;
1293
1294 case SCTP_CMD_ECN_ECNE:
1295 /* Do delayed ECNE processing. */
1296 new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32,
1297 chunk);
1298 if (new_obj)
1299 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1300 SCTP_CHUNK(new_obj));
1301 break;
1302
1303 case SCTP_CMD_ECN_CWR:
1304 /* Do delayed CWR processing. */
1305 sctp_do_ecn_cwr_work(asoc, cmd->obj.u32);
1306 break;
1307
1308 case SCTP_CMD_SETUP_T2:
1309 sctp_cmd_setup_t2(commands, asoc, cmd->obj.ptr);
1310 break;
1311
1312 case SCTP_CMD_TIMER_START:
1313 timer = &asoc->timers[cmd->obj.to];
1314 timeout = asoc->timeouts[cmd->obj.to];
09a62660 1315 BUG_ON(!timeout);
1da177e4
LT
1316
1317 timer->expires = jiffies + timeout;
1318 sctp_association_hold(asoc);
1319 add_timer(timer);
1320 break;
1321
1322 case SCTP_CMD_TIMER_RESTART:
1323 timer = &asoc->timers[cmd->obj.to];
1324 timeout = asoc->timeouts[cmd->obj.to];
1325 if (!mod_timer(timer, jiffies + timeout))
1326 sctp_association_hold(asoc);
1327 break;
1328
1329 case SCTP_CMD_TIMER_STOP:
1330 timer = &asoc->timers[cmd->obj.to];
1331 if (timer_pending(timer) && del_timer(timer))
1332 sctp_association_put(asoc);
1333 break;
1334
3f7a87d2
FF
1335 case SCTP_CMD_INIT_CHOOSE_TRANSPORT:
1336 chunk = cmd->obj.ptr;
1337 t = sctp_assoc_choose_init_transport(asoc);
1338 asoc->init_last_sent_to = t;
1339 chunk->transport = t;
1340 t->init_sent_count++;
1341 break;
1342
1da177e4
LT
1343 case SCTP_CMD_INIT_RESTART:
1344 /* Do the needed accounting and updates
1345 * associated with restarting an initialization
3f7a87d2
FF
1346 * timer. Only multiply the timeout by two if
1347 * all transports have been tried at the current
1348 * timeout.
1349 */
1350 t = asoc->init_last_sent_to;
1351 asoc->init_err_counter++;
1352
1353 if (t->init_sent_count > (asoc->init_cycle + 1)) {
1354 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] *= 2;
1355 if (asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] >
1356 asoc->max_init_timeo) {
1357 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
1358 asoc->max_init_timeo;
1359 }
1360 asoc->init_cycle++;
1361 SCTP_DEBUG_PRINTK(
1362 "T1 INIT Timeout adjustment"
1363 " init_err_counter: %d"
1364 " cycle: %d"
8116ffad 1365 " timeout: %ld\n",
3f7a87d2
FF
1366 asoc->init_err_counter,
1367 asoc->init_cycle,
1368 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT]);
1369 }
1370
1371 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
1372 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
1373 break;
1374
1375 case SCTP_CMD_COOKIEECHO_RESTART:
1376 /* Do the needed accounting and updates
1377 * associated with restarting an initialization
1378 * timer. Only multiply the timeout by two if
1379 * all transports have been tried at the current
1380 * timeout.
1da177e4 1381 */
3f7a87d2
FF
1382 asoc->init_err_counter++;
1383
1384 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] *= 2;
1385 if (asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] >
1da177e4 1386 asoc->max_init_timeo) {
3f7a87d2 1387 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
1da177e4
LT
1388 asoc->max_init_timeo;
1389 }
3f7a87d2
FF
1390 SCTP_DEBUG_PRINTK(
1391 "T1 COOKIE Timeout adjustment"
1392 " init_err_counter: %d"
8116ffad 1393 " timeout: %ld\n",
3f7a87d2
FF
1394 asoc->init_err_counter,
1395 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE]);
1da177e4
LT
1396
1397 /* If we've sent any data bundled with
1398 * COOKIE-ECHO we need to resend.
1399 */
1400 list_for_each(pos, &asoc->peer.transport_addr_list) {
1401 t = list_entry(pos, struct sctp_transport,
1402 transports);
b6157d8e
VY
1403 sctp_retransmit_mark(&asoc->outqueue, t,
1404 SCTP_RTXR_T1_RTX);
1da177e4
LT
1405 }
1406
1407 sctp_add_cmd_sf(commands,
1408 SCTP_CMD_TIMER_RESTART,
3f7a87d2 1409 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE));
1da177e4
LT
1410 break;
1411
1412 case SCTP_CMD_INIT_FAILED:
dc251b2b 1413 sctp_cmd_init_failed(commands, asoc, cmd->obj.err);
1da177e4
LT
1414 break;
1415
1416 case SCTP_CMD_ASSOC_FAILED:
1417 sctp_cmd_assoc_failed(commands, asoc, event_type,
5be291fe 1418 subtype, chunk, cmd->obj.err);
1da177e4
LT
1419 break;
1420
3f7a87d2
FF
1421 case SCTP_CMD_INIT_COUNTER_INC:
1422 asoc->init_err_counter++;
1da177e4
LT
1423 break;
1424
3f7a87d2
FF
1425 case SCTP_CMD_INIT_COUNTER_RESET:
1426 asoc->init_err_counter = 0;
1427 asoc->init_cycle = 0;
1da177e4
LT
1428 break;
1429
1430 case SCTP_CMD_REPORT_DUP:
1431 sctp_tsnmap_mark_dup(&asoc->peer.tsn_map,
1432 cmd->obj.u32);
1433 break;
1434
1435 case SCTP_CMD_REPORT_BAD_TAG:
1436 SCTP_DEBUG_PRINTK("vtag mismatch!\n");
1437 break;
1438
1439 case SCTP_CMD_STRIKE:
1440 /* Mark one strike against a transport. */
1441 sctp_do_8_2_transport_strike(asoc, cmd->obj.transport);
1442 break;
1443
1444 case SCTP_CMD_TRANSPORT_RESET:
1445 t = cmd->obj.transport;
1446 sctp_cmd_transport_reset(commands, asoc, t);
1447 break;
1448
1449 case SCTP_CMD_TRANSPORT_ON:
1450 t = cmd->obj.transport;
1451 sctp_cmd_transport_on(commands, asoc, t, chunk);
1452 break;
1453
1454 case SCTP_CMD_HB_TIMERS_START:
1455 sctp_cmd_hb_timers_start(commands, asoc);
1456 break;
1457
1458 case SCTP_CMD_HB_TIMER_UPDATE:
1459 t = cmd->obj.transport;
1460 sctp_cmd_hb_timer_update(commands, asoc, t);
1461 break;
1462
1463 case SCTP_CMD_HB_TIMERS_STOP:
1464 sctp_cmd_hb_timers_stop(commands, asoc);
1465 break;
1466
1467 case SCTP_CMD_REPORT_ERROR:
1468 error = cmd->obj.error;
1469 break;
1470
1471 case SCTP_CMD_PROCESS_CTSN:
1472 /* Dummy up a SACK for processing. */
2178eda8 1473 sackh.cum_tsn_ack = cmd->obj.be32;
1da177e4
LT
1474 sackh.a_rwnd = 0;
1475 sackh.num_gap_ack_blocks = 0;
1476 sackh.num_dup_tsns = 0;
1477 sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK,
1478 SCTP_SACKH(&sackh));
1479 break;
1480
1481 case SCTP_CMD_DISCARD_PACKET:
1482 /* We need to discard the whole packet. */
1483 chunk->pdiscard = 1;
1484 break;
1485
1486 case SCTP_CMD_RTO_PENDING:
1487 t = cmd->obj.transport;
1488 t->rto_pending = 1;
1489 break;
1490
1491 case SCTP_CMD_PART_DELIVER:
1492 sctp_ulpq_partial_delivery(&asoc->ulpq, cmd->obj.ptr,
1493 GFP_ATOMIC);
1494 break;
1495
1496 case SCTP_CMD_RENEGE:
1497 sctp_ulpq_renege(&asoc->ulpq, cmd->obj.ptr,
1498 GFP_ATOMIC);
1499 break;
1500
1501 case SCTP_CMD_SETUP_T4:
1502 sctp_cmd_setup_t4(commands, asoc, cmd->obj.ptr);
1503 break;
1504
1505 case SCTP_CMD_PROCESS_OPERR:
1506 sctp_cmd_process_operr(commands, asoc, chunk);
1507 break;
1508 case SCTP_CMD_CLEAR_INIT_TAG:
1509 asoc->peer.i.init_tag = 0;
1510 break;
1511 case SCTP_CMD_DEL_NON_PRIMARY:
1512 sctp_cmd_del_non_primary(asoc);
1513 break;
1514 case SCTP_CMD_T3_RTX_TIMERS_STOP:
1515 sctp_cmd_t3_rtx_timers_stop(commands, asoc);
1516 break;
1517 case SCTP_CMD_FORCE_PRIM_RETRAN:
1518 t = asoc->peer.retran_path;
1519 asoc->peer.retran_path = asoc->peer.primary_path;
1520 error = sctp_outq_uncork(&asoc->outqueue);
1521 local_cork = 0;
1522 asoc->peer.retran_path = t;
1523 break;
8de8c873
SS
1524 case SCTP_CMD_SET_SK_ERR:
1525 sctp_cmd_set_sk_err(asoc, cmd->obj.error);
1526 break;
07d93967
VY
1527 case SCTP_CMD_ASSOC_CHANGE:
1528 sctp_cmd_assoc_change(commands, asoc,
1529 cmd->obj.u8);
1530 break;
1531 case SCTP_CMD_ADAPTATION_IND:
1532 sctp_cmd_adaptation_ind(commands, asoc);
1533 break;
1534
730fc3d0
VY
1535 case SCTP_CMD_ASSOC_SHKEY:
1536 error = sctp_auth_asoc_init_active_key(asoc,
1537 GFP_ATOMIC);
1538 break;
1539
1da177e4
LT
1540 default:
1541 printk(KERN_WARNING "Impossible command: %u, %p\n",
1542 cmd->verb, cmd->obj.ptr);
1543 break;
3ff50b79
SH
1544 }
1545
1da177e4
LT
1546 if (error)
1547 break;
1548 }
1549
1550out:
1551 if (local_cork)
1552 sctp_outq_uncork(&asoc->outqueue);
1553 return error;
1554nomem:
1555 error = -ENOMEM;
1556 goto out;
1557}
1558