[SCTP] Fix incorrect setting of sk_bound_dev_if when binding/sending to a ipv6
[linux-2.6] / 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                                 int 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                              int 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         int error = 0;
161
162         if (force)
163                 asoc->peer.sack_needed = 1;
164
165         ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
166         max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
167
168         /* From 12.2 Parameters necessary per association (i.e. the TCB):
169          *
170          * Ack State : This flag indicates if the next received packet
171          *           : is to be responded to with a SACK. ...
172          *           : When DATA chunks are out of order, SACK's
173          *           : are not delayed (see Section 6).
174          *
175          * [This is actually not mentioned in Section 6, but we
176          * implement it here anyway. --piggy]
177          */
178         if (max_tsn_seen != ctsn)
179                 asoc->peer.sack_needed = 1;
180
181         /* From 6.2  Acknowledgement on Reception of DATA Chunks:
182          *
183          * Section 4.2 of [RFC2581] SHOULD be followed. Specifically,
184          * an acknowledgement SHOULD be generated for at least every
185          * second packet (not every second DATA chunk) received, and
186          * SHOULD be generated within 200 ms of the arrival of any
187          * unacknowledged DATA chunk. ...
188          */
189         if (!asoc->peer.sack_needed) {
190                 /* We will need a SACK for the next packet.  */
191                 asoc->peer.sack_needed = 1;
192                 goto out;
193         } else {
194                 if (asoc->a_rwnd > asoc->rwnd)
195                         asoc->a_rwnd = asoc->rwnd;
196                 sack = sctp_make_sack(asoc);
197                 if (!sack)
198                         goto nomem;
199
200                 asoc->peer.sack_needed = 0;
201
202                 error = sctp_outq_tail(&asoc->outqueue, sack);
203
204                 /* Stop the SACK timer.  */
205                 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
206                                 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
207         }
208 out:
209         return error;
210 nomem:
211         error = -ENOMEM;
212         return error;
213 }
214
215 /* When the T3-RTX timer expires, it calls this function to create the
216  * relevant state machine event.
217  */
218 void sctp_generate_t3_rtx_event(unsigned long peer)
219 {
220         int error;
221         struct sctp_transport *transport = (struct sctp_transport *) peer;
222         struct sctp_association *asoc = transport->asoc;
223
224         /* Check whether a task is in the sock.  */
225
226         sctp_bh_lock_sock(asoc->base.sk);
227         if (sock_owned_by_user(asoc->base.sk)) {
228                 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __FUNCTION__);
229
230                 /* Try again later.  */
231                 if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20)))
232                         sctp_transport_hold(transport);
233                 goto out_unlock;
234         }
235
236         /* Is this transport really dead and just waiting around for
237          * the timer to let go of the reference?
238          */
239         if (transport->dead)
240                 goto out_unlock;
241
242         /* Run through the state machine.  */
243         error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT,
244                            SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX),
245                            asoc->state,
246                            asoc->ep, asoc,
247                            transport, GFP_ATOMIC);
248
249         if (error)
250                 asoc->base.sk->sk_err = -error;
251
252 out_unlock:
253         sctp_bh_unlock_sock(asoc->base.sk);
254         sctp_transport_put(transport);
255 }
256
257 /* This is a sa interface for producing timeout events.  It works
258  * for timeouts which use the association as their parameter.
259  */
260 static void sctp_generate_timeout_event(struct sctp_association *asoc,
261                                         sctp_event_timeout_t timeout_type)
262 {
263         int error = 0;
264
265         sctp_bh_lock_sock(asoc->base.sk);
266         if (sock_owned_by_user(asoc->base.sk)) {
267                 SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n",
268                                   __FUNCTION__,
269                                   timeout_type);
270
271                 /* Try again later.  */
272                 if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20)))
273                         sctp_association_hold(asoc);
274                 goto out_unlock;
275         }
276
277         /* Is this association really dead and just waiting around for
278          * the timer to let go of the reference?
279          */
280         if (asoc->base.dead)
281                 goto out_unlock;
282
283         /* Run through the state machine.  */
284         error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT,
285                            SCTP_ST_TIMEOUT(timeout_type),
286                            asoc->state, asoc->ep, asoc,
287                            (void *)timeout_type, GFP_ATOMIC);
288
289         if (error)
290                 asoc->base.sk->sk_err = -error;
291
292 out_unlock:
293         sctp_bh_unlock_sock(asoc->base.sk);
294         sctp_association_put(asoc);
295 }
296
297 static void sctp_generate_t1_cookie_event(unsigned long data)
298 {
299         struct sctp_association *asoc = (struct sctp_association *) data;
300         sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE);
301 }
302
303 static void sctp_generate_t1_init_event(unsigned long data)
304 {
305         struct sctp_association *asoc = (struct sctp_association *) data;
306         sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT);
307 }
308
309 static void sctp_generate_t2_shutdown_event(unsigned long data)
310 {
311         struct sctp_association *asoc = (struct sctp_association *) data;
312         sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN);
313 }
314
315 static void sctp_generate_t4_rto_event(unsigned long data)
316 {
317         struct sctp_association *asoc = (struct sctp_association *) data;
318         sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO);
319 }
320
321 static void sctp_generate_t5_shutdown_guard_event(unsigned long data)
322 {
323         struct sctp_association *asoc = (struct sctp_association *)data;
324         sctp_generate_timeout_event(asoc,
325                                     SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD);
326
327 } /* sctp_generate_t5_shutdown_guard_event() */
328
329 static void sctp_generate_autoclose_event(unsigned long data)
330 {
331         struct sctp_association *asoc = (struct sctp_association *) data;
332         sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE);
333 }
334
335 /* Generate a heart beat event.  If the sock is busy, reschedule.   Make
336  * sure that the transport is still valid.
337  */
338 void sctp_generate_heartbeat_event(unsigned long data)
339 {
340         int error = 0;
341         struct sctp_transport *transport = (struct sctp_transport *) data;
342         struct sctp_association *asoc = transport->asoc;
343
344         sctp_bh_lock_sock(asoc->base.sk);
345         if (sock_owned_by_user(asoc->base.sk)) {
346                 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __FUNCTION__);
347
348                 /* Try again later.  */
349                 if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20)))
350                         sctp_transport_hold(transport);
351                 goto out_unlock;
352         }
353
354         /* Is this structure just waiting around for us to actually
355          * get destroyed?
356          */
357         if (transport->dead)
358                 goto out_unlock;
359
360         error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT,
361                            SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT),
362                            asoc->state, asoc->ep, asoc,
363                            transport, GFP_ATOMIC);
364
365          if (error)
366                  asoc->base.sk->sk_err = -error;
367
368 out_unlock:
369         sctp_bh_unlock_sock(asoc->base.sk);
370         sctp_transport_put(transport);
371 }
372
373 /* Inject a SACK Timeout event into the state machine.  */
374 static void sctp_generate_sack_event(unsigned long data)
375 {
376         struct sctp_association *asoc = (struct sctp_association *) data;
377         sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK);
378 }
379
380 sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = {
381         NULL,
382         sctp_generate_t1_cookie_event,
383         sctp_generate_t1_init_event,
384         sctp_generate_t2_shutdown_event,
385         NULL,
386         sctp_generate_t4_rto_event,
387         sctp_generate_t5_shutdown_guard_event,
388         sctp_generate_heartbeat_event,
389         sctp_generate_sack_event,
390         sctp_generate_autoclose_event,
391 };
392
393
394 /* RFC 2960 8.2 Path Failure Detection
395  *
396  * When its peer endpoint is multi-homed, an endpoint should keep a
397  * error counter for each of the destination transport addresses of the
398  * peer endpoint.
399  *
400  * Each time the T3-rtx timer expires on any address, or when a
401  * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
402  * the error counter of that destination address will be incremented.
403  * When the value in the error counter exceeds the protocol parameter
404  * 'Path.Max.Retrans' of that destination address, the endpoint should
405  * mark the destination transport address as inactive, and a
406  * notification SHOULD be sent to the upper layer.
407  *
408  */
409 static void sctp_do_8_2_transport_strike(struct sctp_association *asoc,
410                                          struct sctp_transport *transport)
411 {
412         /* The check for association's overall error counter exceeding the
413          * threshold is done in the state function.
414          */
415         asoc->overall_error_count++;
416
417         if (transport->active &&
418             (transport->error_count++ >= transport->max_retrans)) {
419                 SCTP_DEBUG_PRINTK("transport_strike: transport "
420                                   "IP:%d.%d.%d.%d failed.\n",
421                                   NIPQUAD(transport->ipaddr.v4.sin_addr));
422                 sctp_assoc_control_transport(asoc, transport,
423                                              SCTP_TRANSPORT_DOWN,
424                                              SCTP_FAILED_THRESHOLD);
425         }
426
427         /* E2) For the destination address for which the timer
428          * expires, set RTO <- RTO * 2 ("back off the timer").  The
429          * maximum value discussed in rule C7 above (RTO.max) may be
430          * used to provide an upper bound to this doubling operation.
431          */
432         transport->rto = min((transport->rto * 2), transport->asoc->rto_max);
433 }
434
435 /* Worker routine to handle INIT command failure.  */
436 static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands,
437                                  struct sctp_association *asoc,
438                                  unsigned error)
439 {
440         struct sctp_ulpevent *event;
441
442         event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC,
443                                                 (__u16)error, 0, 0,
444                                                 GFP_ATOMIC);
445
446         if (event)
447                 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
448                                 SCTP_ULPEVENT(event));
449
450         sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
451                         SCTP_STATE(SCTP_STATE_CLOSED));
452
453         /* SEND_FAILED sent later when cleaning up the association. */
454         asoc->outqueue.error = error;
455         sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
456 }
457
458 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED.  */
459 static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands,
460                                   struct sctp_association *asoc,
461                                   sctp_event_t event_type,
462                                   sctp_subtype_t subtype,
463                                   struct sctp_chunk *chunk,
464                                   unsigned error)
465 {
466         struct sctp_ulpevent *event;
467
468         /* Cancel any partial delivery in progress. */
469         sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
470
471         event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
472                                                 (__u16)error, 0, 0,
473                                                 GFP_ATOMIC);
474         if (event)
475                 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
476                                 SCTP_ULPEVENT(event));
477
478         sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
479                         SCTP_STATE(SCTP_STATE_CLOSED));
480
481         /* Set sk_err to ECONNRESET on a 1-1 style socket. */
482         if (!sctp_style(asoc->base.sk, UDP))
483                 asoc->base.sk->sk_err = ECONNRESET; 
484
485         /* SEND_FAILED sent later when cleaning up the association. */
486         asoc->outqueue.error = error;
487         sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
488 }
489
490 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
491  * inside the cookie.  In reality, this is only used for INIT-ACK processing
492  * since all other cases use "temporary" associations and can do all
493  * their work in statefuns directly.
494  */
495 static int sctp_cmd_process_init(sctp_cmd_seq_t *commands,
496                                  struct sctp_association *asoc,
497                                  struct sctp_chunk *chunk,
498                                  sctp_init_chunk_t *peer_init, int gfp)
499 {
500         int error;
501
502         /* We only process the init as a sideeffect in a single
503          * case.   This is when we process the INIT-ACK.   If we
504          * fail during INIT processing (due to malloc problems),
505          * just return the error and stop processing the stack.
506          */
507         if (!sctp_process_init(asoc, chunk->chunk_hdr->type,
508                                sctp_source(chunk), peer_init, gfp))
509                 error = -ENOMEM;
510         else
511                 error = 0;
512
513         return error;
514 }
515
516 /* Helper function to break out starting up of heartbeat timers.  */
517 static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds,
518                                      struct sctp_association *asoc)
519 {
520         struct sctp_transport *t;
521         struct list_head *pos;
522
523         /* Start a heartbeat timer for each transport on the association.
524          * hold a reference on the transport to make sure none of
525          * the needed data structures go away.
526          */
527         list_for_each(pos, &asoc->peer.transport_addr_list) {
528                 t = list_entry(pos, struct sctp_transport, transports);
529
530                 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
531                         sctp_transport_hold(t);
532         }
533 }
534
535 static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds,
536                                     struct sctp_association *asoc)
537 {
538         struct sctp_transport *t;
539         struct list_head *pos;
540
541         /* Stop all heartbeat timers. */
542
543         list_for_each(pos, &asoc->peer.transport_addr_list) {
544                 t = list_entry(pos, struct sctp_transport, transports);
545                 if (del_timer(&t->hb_timer))
546                         sctp_transport_put(t);
547         }
548 }
549
550 /* Helper function to stop any pending T3-RTX timers */
551 static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds,
552                                         struct sctp_association *asoc)
553 {
554         struct sctp_transport *t;
555         struct list_head *pos;
556
557         list_for_each(pos, &asoc->peer.transport_addr_list) {
558                 t = list_entry(pos, struct sctp_transport, transports);
559                 if (timer_pending(&t->T3_rtx_timer) &&
560                     del_timer(&t->T3_rtx_timer)) {
561                         sctp_transport_put(t);
562                 }
563         }
564 }
565
566
567 /* Helper function to update the heartbeat timer. */
568 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds,
569                                      struct sctp_association *asoc,
570                                      struct sctp_transport *t)
571 {
572         /* Update the heartbeat timer.  */
573         if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
574                 sctp_transport_hold(t);
575 }
576
577 /* Helper function to handle the reception of an HEARTBEAT ACK.  */
578 static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
579                                   struct sctp_association *asoc,
580                                   struct sctp_transport *t,
581                                   struct sctp_chunk *chunk)
582 {
583         sctp_sender_hb_info_t *hbinfo;
584
585         /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
586          * HEARTBEAT should clear the error counter of the destination
587          * transport address to which the HEARTBEAT was sent.
588          * The association's overall error count is also cleared.
589          */
590         t->error_count = 0;
591         t->asoc->overall_error_count = 0;
592
593         /* Mark the destination transport address as active if it is not so
594          * marked.
595          */
596         if (!t->active)
597                 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
598                                              SCTP_HEARTBEAT_SUCCESS);
599
600         /* The receiver of the HEARTBEAT ACK should also perform an
601          * RTT measurement for that destination transport address
602          * using the time value carried in the HEARTBEAT ACK chunk.
603          */
604         hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data;
605         sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at));
606 }
607
608 /* Helper function to do a transport reset at the expiry of the hearbeat
609  * timer.
610  */
611 static void sctp_cmd_transport_reset(sctp_cmd_seq_t *cmds,
612                                      struct sctp_association *asoc,
613                                      struct sctp_transport *t)
614 {
615         sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE);
616
617         /* Mark one strike against a transport.  */
618         sctp_do_8_2_transport_strike(asoc, t);
619 }
620
621 /* Helper function to process the process SACK command.  */
622 static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds,
623                                  struct sctp_association *asoc,
624                                  struct sctp_sackhdr *sackh)
625 {
626         int err;
627
628         if (sctp_outq_sack(&asoc->outqueue, sackh)) {
629                 /* There are no more TSNs awaiting SACK.  */
630                 err = sctp_do_sm(SCTP_EVENT_T_OTHER,
631                                  SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN),
632                                  asoc->state, asoc->ep, asoc, NULL,
633                                  GFP_ATOMIC);
634         } else {
635                 /* Windows may have opened, so we need
636                  * to check if we have DATA to transmit
637                  */
638                 err = sctp_outq_flush(&asoc->outqueue, 0);
639         }
640
641         return err;
642 }
643
644 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
645  * the transport for a shutdown chunk.
646  */
647 static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds, 
648                               struct sctp_association *asoc,
649                               struct sctp_chunk *chunk)
650 {
651         struct sctp_transport *t;
652
653         t = sctp_assoc_choose_shutdown_transport(asoc);
654         asoc->shutdown_last_sent_to = t;
655         asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto;
656         chunk->transport = t;
657 }
658
659 /* Helper function to change the state of an association. */
660 static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds, 
661                                struct sctp_association *asoc,
662                                sctp_state_t state)
663 {
664         struct sock *sk = asoc->base.sk;
665
666         asoc->state = state;
667
668         if (sctp_style(sk, TCP)) {
669                 /* Change the sk->sk_state of a TCP-style socket that has 
670                  * sucessfully completed a connect() call.
671                  */
672                 if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED))
673                         sk->sk_state = SCTP_SS_ESTABLISHED;
674
675                 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
676                 if (sctp_state(asoc, SHUTDOWN_RECEIVED) &&
677                     sctp_sstate(sk, ESTABLISHED))
678                         sk->sk_shutdown |= RCV_SHUTDOWN;
679         }
680
681         if (sctp_state(asoc, ESTABLISHED) ||
682             sctp_state(asoc, CLOSED) ||
683             sctp_state(asoc, SHUTDOWN_RECEIVED)) {
684                 /* Wake up any processes waiting in the asoc's wait queue in
685                  * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
686                  */
687                 if (waitqueue_active(&asoc->wait))
688                         wake_up_interruptible(&asoc->wait);
689
690                 /* Wake up any processes waiting in the sk's sleep queue of
691                  * a TCP-style or UDP-style peeled-off socket in
692                  * sctp_wait_for_accept() or sctp_wait_for_packet().
693                  * For a UDP-style socket, the waiters are woken up by the
694                  * notifications.
695                  */
696                 if (!sctp_style(sk, UDP))
697                         sk->sk_state_change(sk);
698         }
699 }
700
701 /* Helper function to delete an association. */
702 static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds,
703                                 struct sctp_association *asoc)
704 {
705         struct sock *sk = asoc->base.sk;
706
707         /* If it is a non-temporary association belonging to a TCP-style
708          * listening socket that is not closed, do not free it so that accept() 
709          * can pick it up later.
710          */ 
711         if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) &&
712             (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK))
713                 return;
714
715         sctp_unhash_established(asoc);
716         sctp_association_free(asoc);
717 }
718
719 /*
720  * ADDIP Section 4.1 ASCONF Chunk Procedures
721  * A4) Start a T-4 RTO timer, using the RTO value of the selected
722  * destination address (we use active path instead of primary path just
723  * because primary path may be inactive. 
724  */
725 static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds,
726                                 struct sctp_association *asoc,
727                                 struct sctp_chunk *chunk)
728 {
729         struct sctp_transport *t;
730
731         t = asoc->peer.active_path;
732         asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto;
733         chunk->transport = t;
734 }
735
736 /* Process an incoming Operation Error Chunk. */ 
737 static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds,
738                                    struct sctp_association *asoc,
739                                    struct sctp_chunk *chunk)
740 {
741         struct sctp_operr_chunk *operr_chunk;
742         struct sctp_errhdr *err_hdr;
743
744         operr_chunk = (struct sctp_operr_chunk *)chunk->chunk_hdr;
745         err_hdr = &operr_chunk->err_hdr;
746
747         switch (err_hdr->cause) {
748         case SCTP_ERROR_UNKNOWN_CHUNK:
749         {
750                 struct sctp_chunkhdr *unk_chunk_hdr;
751
752                 unk_chunk_hdr = (struct sctp_chunkhdr *)err_hdr->variable;
753                 switch (unk_chunk_hdr->type) {
754                 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with an
755                  * ERROR chunk reporting that it did not recognized the ASCONF
756                  * chunk type, the sender of the ASCONF MUST NOT send any
757                  * further ASCONF chunks and MUST stop its T-4 timer.
758                  */
759                 case SCTP_CID_ASCONF:
760                         asoc->peer.asconf_capable = 0;
761                         sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP,
762                                         SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO));
763                         break;
764                 default:
765                         break;
766                 }
767                 break;
768         }
769         default:
770                 break;
771         }
772 }
773
774 /* Process variable FWDTSN chunk information. */
775 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq, 
776                                     struct sctp_chunk *chunk)
777 {
778         struct sctp_fwdtsn_skip *skip;
779         /* Walk through all the skipped SSNs */
780         sctp_walk_fwdtsn(skip, chunk) {
781                 sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn));
782         }
783
784         return;
785 }
786
787 /* Helper function to remove the association non-primary peer 
788  * transports.
789  */ 
790 static void sctp_cmd_del_non_primary(struct sctp_association *asoc)
791 {
792         struct sctp_transport *t;
793         struct list_head *pos;
794         struct list_head *temp;
795
796         list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
797                 t = list_entry(pos, struct sctp_transport, transports);
798                 if (!sctp_cmp_addr_exact(&t->ipaddr,
799                                          &asoc->peer.primary_addr)) {
800                         sctp_assoc_del_peer(asoc, &t->ipaddr);
801                 }
802         }
803
804         return;
805 }
806
807 /* These three macros allow us to pull the debugging code out of the
808  * main flow of sctp_do_sm() to keep attention focused on the real
809  * functionality there.
810  */
811 #define DEBUG_PRE \
812         SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
813                           "ep %p, %s, %s, asoc %p[%s], %s\n", \
814                           ep, sctp_evttype_tbl[event_type], \
815                           (*debug_fn)(subtype), asoc, \
816                           sctp_state_tbl[state], state_fn->name)
817
818 #define DEBUG_POST \
819         SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
820                           "asoc %p, status: %s\n", \
821                           asoc, sctp_status_tbl[status])
822
823 #define DEBUG_POST_SFX \
824         SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
825                           error, asoc, \
826                           sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
827                           sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
828
829 /*
830  * This is the master state machine processing function.
831  *
832  * If you want to understand all of lksctp, this is a
833  * good place to start.
834  */
835 int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype,
836                sctp_state_t state,
837                struct sctp_endpoint *ep,
838                struct sctp_association *asoc,
839                void *event_arg,
840                int gfp)
841 {
842         sctp_cmd_seq_t commands;
843         const sctp_sm_table_entry_t *state_fn;
844         sctp_disposition_t status;
845         int error = 0;
846         typedef const char *(printfn_t)(sctp_subtype_t);
847
848         static printfn_t *table[] = {
849                 NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname,
850         };
851         printfn_t *debug_fn  __attribute__ ((unused)) = table[event_type];
852
853         /* Look up the state function, run it, and then process the
854          * side effects.  These three steps are the heart of lksctp.
855          */
856         state_fn = sctp_sm_lookup_event(event_type, state, subtype);
857
858         sctp_init_cmd_seq(&commands);
859
860         DEBUG_PRE;
861         status = (*state_fn->fn)(ep, asoc, subtype, event_arg, &commands);
862         DEBUG_POST;
863
864         error = sctp_side_effects(event_type, subtype, state,
865                                   ep, asoc, event_arg, status, 
866                                   &commands, gfp);
867         DEBUG_POST_SFX;
868
869         return error;
870 }
871
872 #undef DEBUG_PRE
873 #undef DEBUG_POST
874
875 /*****************************************************************
876  * This the master state function side effect processing function.
877  *****************************************************************/
878 static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
879                              sctp_state_t state,
880                              struct sctp_endpoint *ep,
881                              struct sctp_association *asoc,
882                              void *event_arg,
883                              sctp_disposition_t status,
884                              sctp_cmd_seq_t *commands,
885                              int gfp)
886 {
887         int error;
888
889         /* FIXME - Most of the dispositions left today would be categorized
890          * as "exceptional" dispositions.  For those dispositions, it
891          * may not be proper to run through any of the commands at all.
892          * For example, the command interpreter might be run only with
893          * disposition SCTP_DISPOSITION_CONSUME.
894          */
895         if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state,
896                                                ep, asoc,
897                                                event_arg, status,
898                                                commands, gfp)))
899                 goto bail;
900
901         switch (status) {
902         case SCTP_DISPOSITION_DISCARD:
903                 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
904                                   "event_type %d, event_id %d\n",
905                                   state, event_type, subtype.chunk);
906                 break;
907
908         case SCTP_DISPOSITION_NOMEM:
909                 /* We ran out of memory, so we need to discard this
910                  * packet.
911                  */
912                 /* BUG--we should now recover some memory, probably by
913                  * reneging...
914                  */
915                 error = -ENOMEM;
916                 break;
917
918         case SCTP_DISPOSITION_DELETE_TCB:
919                 /* This should now be a command. */
920                 break;
921
922         case SCTP_DISPOSITION_CONSUME:
923         case SCTP_DISPOSITION_ABORT:
924                 /*
925                  * We should no longer have much work to do here as the
926                  * real work has been done as explicit commands above.
927                  */
928                 break;
929
930         case SCTP_DISPOSITION_VIOLATION:
931                 printk(KERN_ERR "sctp protocol violation state %d "
932                        "chunkid %d\n", state, subtype.chunk);
933                 break;
934
935         case SCTP_DISPOSITION_NOT_IMPL:
936                 printk(KERN_WARNING "sctp unimplemented feature in state %d, "
937                        "event_type %d, event_id %d\n",
938                        state, event_type, subtype.chunk);
939                 break;
940
941         case SCTP_DISPOSITION_BUG:
942                 printk(KERN_ERR "sctp bug in state %d, "
943                        "event_type %d, event_id %d\n",
944                        state, event_type, subtype.chunk);
945                 BUG();
946                 break;
947
948         default:
949                 printk(KERN_ERR "sctp impossible disposition %d "
950                        "in state %d, event_type %d, event_id %d\n",
951                        status, state, event_type, subtype.chunk);
952                 BUG();
953                 break;
954         };
955
956 bail:
957         return error;
958 }
959
960 /********************************************************************
961  * 2nd Level Abstractions
962  ********************************************************************/
963
964 /* This is the side-effect interpreter.  */
965 static int sctp_cmd_interpreter(sctp_event_t event_type,
966                                 sctp_subtype_t subtype,
967                                 sctp_state_t state,
968                                 struct sctp_endpoint *ep,
969                                 struct sctp_association *asoc,
970                                 void *event_arg,
971                                 sctp_disposition_t status,
972                                 sctp_cmd_seq_t *commands,
973                                 int gfp)
974 {
975         int error = 0;
976         int force;
977         sctp_cmd_t *cmd;
978         struct sctp_chunk *new_obj;
979         struct sctp_chunk *chunk = NULL;
980         struct sctp_packet *packet;
981         struct list_head *pos;
982         struct timer_list *timer;
983         unsigned long timeout;
984         struct sctp_transport *t;
985         struct sctp_sackhdr sackh;
986         int local_cork = 0;
987
988         if (SCTP_EVENT_T_TIMEOUT != event_type)
989                 chunk = (struct sctp_chunk *) event_arg;
990
991         /* Note:  This whole file is a huge candidate for rework.
992          * For example, each command could either have its own handler, so
993          * the loop would look like:
994          *     while (cmds)
995          *         cmd->handle(x, y, z)
996          * --jgrimm
997          */
998         while (NULL != (cmd = sctp_next_cmd(commands))) {
999                 switch (cmd->verb) {
1000                 case SCTP_CMD_NOP:
1001                         /* Do nothing. */
1002                         break;
1003
1004                 case SCTP_CMD_NEW_ASOC:
1005                         /* Register a new association.  */
1006                         if (local_cork) {
1007                                 sctp_outq_uncork(&asoc->outqueue); 
1008                                 local_cork = 0;
1009                         }
1010                         asoc = cmd->obj.ptr;
1011                         /* Register with the endpoint.  */
1012                         sctp_endpoint_add_asoc(ep, asoc);
1013                         sctp_hash_established(asoc);
1014                         break;
1015
1016                 case SCTP_CMD_UPDATE_ASSOC:
1017                        sctp_assoc_update(asoc, cmd->obj.ptr);
1018                        break;
1019
1020                 case SCTP_CMD_PURGE_OUTQUEUE:
1021                        sctp_outq_teardown(&asoc->outqueue);
1022                        break;
1023
1024                 case SCTP_CMD_DELETE_TCB:                       
1025                         if (local_cork) {
1026                                 sctp_outq_uncork(&asoc->outqueue);
1027                                 local_cork = 0;
1028                         }
1029                         /* Delete the current association.  */
1030                         sctp_cmd_delete_tcb(commands, asoc);
1031                         asoc = NULL;
1032                         break;
1033
1034                 case SCTP_CMD_NEW_STATE:
1035                         /* Enter a new state.  */
1036                         sctp_cmd_new_state(commands, asoc, cmd->obj.state);
1037                         break;
1038
1039                 case SCTP_CMD_REPORT_TSN:
1040                         /* Record the arrival of a TSN.  */
1041                         sctp_tsnmap_mark(&asoc->peer.tsn_map, cmd->obj.u32);
1042                         break;
1043
1044                 case SCTP_CMD_REPORT_FWDTSN:
1045                         /* Move the Cumulattive TSN Ack ahead. */
1046                         sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32);
1047
1048                         /* Abort any in progress partial delivery. */
1049                         sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
1050                         break;
1051
1052                 case SCTP_CMD_PROCESS_FWDTSN:
1053                         sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.ptr);
1054                         break;
1055
1056                 case SCTP_CMD_GEN_SACK:
1057                         /* Generate a Selective ACK.
1058                          * The argument tells us whether to just count
1059                          * the packet and MAYBE generate a SACK, or
1060                          * force a SACK out.
1061                          */
1062                         force = cmd->obj.i32;
1063                         error = sctp_gen_sack(asoc, force, commands);
1064                         break;
1065
1066                 case SCTP_CMD_PROCESS_SACK:
1067                         /* Process an inbound SACK.  */
1068                         error = sctp_cmd_process_sack(commands, asoc,
1069                                                       cmd->obj.ptr);
1070                         break;
1071
1072                 case SCTP_CMD_GEN_INIT_ACK:
1073                         /* Generate an INIT ACK chunk.  */
1074                         new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC,
1075                                                      0);
1076                         if (!new_obj)
1077                                 goto nomem;
1078
1079                         sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1080                                         SCTP_CHUNK(new_obj));
1081                         break;
1082
1083                 case SCTP_CMD_PEER_INIT:
1084                         /* Process a unified INIT from the peer.
1085                          * Note: Only used during INIT-ACK processing.  If
1086                          * there is an error just return to the outter
1087                          * layer which will bail.
1088                          */
1089                         error = sctp_cmd_process_init(commands, asoc, chunk,
1090                                                       cmd->obj.ptr, gfp);
1091                         break;
1092
1093                 case SCTP_CMD_GEN_COOKIE_ECHO:
1094                         /* Generate a COOKIE ECHO chunk.  */
1095                         new_obj = sctp_make_cookie_echo(asoc, chunk);
1096                         if (!new_obj) {
1097                                 if (cmd->obj.ptr)
1098                                         sctp_chunk_free(cmd->obj.ptr);
1099                                 goto nomem;
1100                         }
1101                         sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1102                                         SCTP_CHUNK(new_obj));
1103
1104                         /* If there is an ERROR chunk to be sent along with
1105                          * the COOKIE_ECHO, send it, too.
1106                          */
1107                         if (cmd->obj.ptr)
1108                                 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1109                                                 SCTP_CHUNK(cmd->obj.ptr));
1110
1111                         /* FIXME - Eventually come up with a cleaner way to
1112                          * enabling COOKIE-ECHO + DATA bundling during 
1113                          * multihoming stale cookie scenarios, the following 
1114                          * command plays with asoc->peer.retran_path to 
1115                          * avoid the problem of sending the COOKIE-ECHO and 
1116                          * DATA in different paths, which could result 
1117                          * in the association being ABORTed if the DATA chunk 
1118                          * is processed first by the server.  Checking the
1119                          * init error counter simply causes this command
1120                          * to be executed only during failed attempts of
1121                          * association establishment.
1122                          */
1123                         if ((asoc->peer.retran_path != 
1124                              asoc->peer.primary_path) && 
1125                             (asoc->counters[SCTP_COUNTER_INIT_ERROR] > 0)) {
1126                                 sctp_add_cmd_sf(commands, 
1127                                                 SCTP_CMD_FORCE_PRIM_RETRAN,
1128                                                 SCTP_NULL());
1129                         }
1130
1131                         break;
1132
1133                 case SCTP_CMD_GEN_SHUTDOWN:
1134                         /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1135                          * Reset error counts.
1136                          */
1137                         asoc->overall_error_count = 0;
1138
1139                         /* Generate a SHUTDOWN chunk.  */
1140                         new_obj = sctp_make_shutdown(asoc, chunk);
1141                         if (!new_obj)
1142                                 goto nomem;
1143                         sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1144                                         SCTP_CHUNK(new_obj));
1145                         break;
1146
1147                 case SCTP_CMD_CHUNK_ULP:
1148                         /* Send a chunk to the sockets layer.  */
1149                         SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1150                                           "chunk_up:", cmd->obj.ptr,
1151                                           "ulpq:", &asoc->ulpq);
1152                         sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.ptr,
1153                                             GFP_ATOMIC);
1154                         break;
1155
1156                 case SCTP_CMD_EVENT_ULP:
1157                         /* Send a notification to the sockets layer.  */
1158                         SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1159                                           "event_up:",cmd->obj.ptr,
1160                                           "ulpq:",&asoc->ulpq);
1161                         sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ptr);
1162                         break;
1163
1164                 case SCTP_CMD_REPLY:
1165                         /* If an caller has not already corked, do cork. */
1166                         if (!asoc->outqueue.cork) {
1167                                 sctp_outq_cork(&asoc->outqueue);
1168                                 local_cork = 1;
1169                         }
1170                         /* Send a chunk to our peer.  */
1171                         error = sctp_outq_tail(&asoc->outqueue, cmd->obj.ptr);
1172                         break;
1173
1174                 case SCTP_CMD_SEND_PKT:
1175                         /* Send a full packet to our peer.  */
1176                         packet = cmd->obj.ptr;
1177                         sctp_packet_transmit(packet);
1178                         sctp_ootb_pkt_free(packet);
1179                         break;
1180
1181                 case SCTP_CMD_RETRAN:
1182                         /* Mark a transport for retransmission.  */
1183                         sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1184                                         SCTP_RTXR_T3_RTX);
1185                         break;
1186
1187                 case SCTP_CMD_TRANSMIT:
1188                         /* Kick start transmission. */
1189                         error = sctp_outq_uncork(&asoc->outqueue);
1190                         local_cork = 0;
1191                         break;
1192
1193                 case SCTP_CMD_ECN_CE:
1194                         /* Do delayed CE processing.   */
1195                         sctp_do_ecn_ce_work(asoc, cmd->obj.u32);
1196                         break;
1197
1198                 case SCTP_CMD_ECN_ECNE:
1199                         /* Do delayed ECNE processing. */
1200                         new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32,
1201                                                         chunk);
1202                         if (new_obj)
1203                                 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1204                                                 SCTP_CHUNK(new_obj));
1205                         break;
1206
1207                 case SCTP_CMD_ECN_CWR:
1208                         /* Do delayed CWR processing.  */
1209                         sctp_do_ecn_cwr_work(asoc, cmd->obj.u32);
1210                         break;
1211
1212                 case SCTP_CMD_SETUP_T2:
1213                         sctp_cmd_setup_t2(commands, asoc, cmd->obj.ptr);
1214                         break;
1215
1216                 case SCTP_CMD_TIMER_START:
1217                         timer = &asoc->timers[cmd->obj.to];
1218                         timeout = asoc->timeouts[cmd->obj.to];
1219                         if (!timeout)
1220                                 BUG();
1221
1222                         timer->expires = jiffies + timeout;
1223                         sctp_association_hold(asoc);
1224                         add_timer(timer);
1225                         break;
1226
1227                 case SCTP_CMD_TIMER_RESTART:
1228                         timer = &asoc->timers[cmd->obj.to];
1229                         timeout = asoc->timeouts[cmd->obj.to];
1230                         if (!mod_timer(timer, jiffies + timeout))
1231                                 sctp_association_hold(asoc);
1232                         break;
1233
1234                 case SCTP_CMD_TIMER_STOP:
1235                         timer = &asoc->timers[cmd->obj.to];
1236                         if (timer_pending(timer) && del_timer(timer))
1237                                 sctp_association_put(asoc);
1238                         break;
1239
1240                 case SCTP_CMD_INIT_RESTART:
1241                         /* Do the needed accounting and updates
1242                          * associated with restarting an initialization
1243                          * timer.
1244                          */
1245                         asoc->counters[SCTP_COUNTER_INIT_ERROR]++;
1246                         asoc->timeouts[cmd->obj.to] *= 2;
1247                         if (asoc->timeouts[cmd->obj.to] >
1248                             asoc->max_init_timeo) {
1249                                 asoc->timeouts[cmd->obj.to] =
1250                                         asoc->max_init_timeo;
1251                         }
1252
1253                         /* If we've sent any data bundled with
1254                          * COOKIE-ECHO we need to resend.
1255                          */
1256                         list_for_each(pos, &asoc->peer.transport_addr_list) {
1257                                 t = list_entry(pos, struct sctp_transport,
1258                                                transports);
1259                                 sctp_retransmit_mark(&asoc->outqueue, t, 0);
1260                         }
1261
1262                         sctp_add_cmd_sf(commands,
1263                                         SCTP_CMD_TIMER_RESTART,
1264                                         SCTP_TO(cmd->obj.to));
1265                         break;
1266
1267                 case SCTP_CMD_INIT_FAILED:
1268                         sctp_cmd_init_failed(commands, asoc, cmd->obj.u32);
1269                         break;
1270
1271                 case SCTP_CMD_ASSOC_FAILED:
1272                         sctp_cmd_assoc_failed(commands, asoc, event_type,
1273                                               subtype, chunk, cmd->obj.u32);
1274                         break;
1275
1276                 case SCTP_CMD_COUNTER_INC:
1277                         asoc->counters[cmd->obj.counter]++;
1278                         break;
1279
1280                 case SCTP_CMD_COUNTER_RESET:
1281                         asoc->counters[cmd->obj.counter] = 0;
1282                         break;
1283
1284                 case SCTP_CMD_REPORT_DUP:
1285                         sctp_tsnmap_mark_dup(&asoc->peer.tsn_map,
1286                                              cmd->obj.u32);
1287                         break;
1288
1289                 case SCTP_CMD_REPORT_BAD_TAG:
1290                         SCTP_DEBUG_PRINTK("vtag mismatch!\n");
1291                         break;
1292
1293                 case SCTP_CMD_STRIKE:
1294                         /* Mark one strike against a transport.  */
1295                         sctp_do_8_2_transport_strike(asoc, cmd->obj.transport);
1296                         break;
1297
1298                 case SCTP_CMD_TRANSPORT_RESET:
1299                         t = cmd->obj.transport;
1300                         sctp_cmd_transport_reset(commands, asoc, t);
1301                         break;
1302
1303                 case SCTP_CMD_TRANSPORT_ON:
1304                         t = cmd->obj.transport;
1305                         sctp_cmd_transport_on(commands, asoc, t, chunk);
1306                         break;
1307
1308                 case SCTP_CMD_HB_TIMERS_START:
1309                         sctp_cmd_hb_timers_start(commands, asoc);
1310                         break;
1311
1312                 case SCTP_CMD_HB_TIMER_UPDATE:
1313                         t = cmd->obj.transport;
1314                         sctp_cmd_hb_timer_update(commands, asoc, t);
1315                         break;
1316
1317                 case SCTP_CMD_HB_TIMERS_STOP:
1318                         sctp_cmd_hb_timers_stop(commands, asoc);
1319                         break;
1320
1321                 case SCTP_CMD_REPORT_ERROR:
1322                         error = cmd->obj.error;
1323                         break;
1324
1325                 case SCTP_CMD_PROCESS_CTSN:
1326                         /* Dummy up a SACK for processing. */
1327                         sackh.cum_tsn_ack = cmd->obj.u32;
1328                         sackh.a_rwnd = 0;
1329                         sackh.num_gap_ack_blocks = 0;
1330                         sackh.num_dup_tsns = 0;
1331                         sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK,
1332                                         SCTP_SACKH(&sackh));
1333                         break;
1334
1335                 case SCTP_CMD_DISCARD_PACKET:
1336                         /* We need to discard the whole packet.  */
1337                         chunk->pdiscard = 1;
1338                         break;
1339
1340                 case SCTP_CMD_RTO_PENDING:
1341                         t = cmd->obj.transport;
1342                         t->rto_pending = 1;
1343                         break;
1344
1345                 case SCTP_CMD_PART_DELIVER:
1346                         sctp_ulpq_partial_delivery(&asoc->ulpq, cmd->obj.ptr,
1347                                                    GFP_ATOMIC);
1348                         break;
1349
1350                 case SCTP_CMD_RENEGE:
1351                         sctp_ulpq_renege(&asoc->ulpq, cmd->obj.ptr,
1352                                          GFP_ATOMIC);
1353                         break;
1354
1355                 case SCTP_CMD_SETUP_T4:
1356                         sctp_cmd_setup_t4(commands, asoc, cmd->obj.ptr);
1357                         break;
1358
1359                 case SCTP_CMD_PROCESS_OPERR:
1360                         sctp_cmd_process_operr(commands, asoc, chunk);
1361                         break;
1362                 case SCTP_CMD_CLEAR_INIT_TAG:
1363                         asoc->peer.i.init_tag = 0;
1364                         break;
1365                 case SCTP_CMD_DEL_NON_PRIMARY:
1366                         sctp_cmd_del_non_primary(asoc);
1367                         break;
1368                 case SCTP_CMD_T3_RTX_TIMERS_STOP:
1369                         sctp_cmd_t3_rtx_timers_stop(commands, asoc);
1370                         break;
1371                 case SCTP_CMD_FORCE_PRIM_RETRAN:
1372                         t = asoc->peer.retran_path;
1373                         asoc->peer.retran_path = asoc->peer.primary_path;
1374                         error = sctp_outq_uncork(&asoc->outqueue);
1375                         local_cork = 0;
1376                         asoc->peer.retran_path = t;
1377                         break;
1378                 default:
1379                         printk(KERN_WARNING "Impossible command: %u, %p\n",
1380                                cmd->verb, cmd->obj.ptr);
1381                         break;
1382                 };
1383                 if (error)
1384                         break;
1385         }
1386
1387 out:
1388         if (local_cork)
1389                 sctp_outq_uncork(&asoc->outqueue);
1390         return error;
1391 nomem:
1392         error = -ENOMEM;
1393         goto out;
1394 }
1395