1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
6 * This file is part of the SCTP kernel implementation
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.
12 * This SCTP 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)
18 * This SCTP 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.
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.
29 * Please send any bug reports or fixes you make to the
31 * lksctp developers <lksctp-developers@lists.sourceforge.net>
33 * Or submit a bug report through the following website:
34 * http://www.sf.net/projects/lksctp
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>
46 * Any bugs reported given to us we will try to fix... any fixes shared will
47 * be incorporated into the next SCTP release.
50 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
52 #include <linux/skbuff.h>
53 #include <linux/types.h>
54 #include <linux/socket.h>
56 #include <linux/gfp.h>
58 #include <net/sctp/sctp.h>
59 #include <net/sctp/sm.h>
61 static int sctp_cmd_interpreter(sctp_event_t event_type,
62 sctp_subtype_t subtype,
64 struct sctp_endpoint *ep,
65 struct sctp_association *asoc,
67 sctp_disposition_t status,
68 sctp_cmd_seq_t *commands,
70 static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
72 struct sctp_endpoint *ep,
73 struct sctp_association *asoc,
75 sctp_disposition_t status,
76 sctp_cmd_seq_t *commands,
79 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds,
80 struct sctp_transport *t);
81 /********************************************************************
83 ********************************************************************/
85 /* A helper function for delayed processing of INET ECN CE bit. */
86 static void sctp_do_ecn_ce_work(struct sctp_association *asoc,
89 /* Save the TSN away for comparison when we receive CWR */
91 asoc->last_ecne_tsn = lowest_tsn;
95 /* Helper function for delayed processing of SCTP ECNE chunk. */
96 /* RFC 2960 Appendix A
98 * RFC 2481 details a specific bit for a sender to send in
99 * the header of its next outbound TCP segment to indicate to
100 * its peer that it has reduced its congestion window. This
101 * is termed the CWR bit. For SCTP the same indication is made
102 * by including the CWR chunk. This chunk contains one data
103 * element, i.e. the TSN number that was sent in the ECNE chunk.
104 * This element represents the lowest TSN number in the datagram
105 * that was originally marked with the CE bit.
107 static struct sctp_chunk *sctp_do_ecn_ecne_work(struct sctp_association *asoc,
109 struct sctp_chunk *chunk)
111 struct sctp_chunk *repl;
113 /* Our previously transmitted packet ran into some congestion
114 * so we should take action by reducing cwnd and ssthresh
115 * and then ACK our peer that we we've done so by
119 /* First, try to determine if we want to actually lower
120 * our cwnd variables. Only lower them if the ECNE looks more
121 * recent than the last response.
123 if (TSN_lt(asoc->last_cwr_tsn, lowest_tsn)) {
124 struct sctp_transport *transport;
126 /* Find which transport's congestion variables
127 * need to be adjusted.
129 transport = sctp_assoc_lookup_tsn(asoc, lowest_tsn);
131 /* Update the congestion variables. */
133 sctp_transport_lower_cwnd(transport,
134 SCTP_LOWER_CWND_ECNE);
135 asoc->last_cwr_tsn = lowest_tsn;
138 /* Always try to quiet the other end. In case of lost CWR,
139 * resend last_cwr_tsn.
141 repl = sctp_make_cwr(asoc, asoc->last_cwr_tsn, chunk);
143 /* If we run out of memory, it will look like a lost CWR. We'll
144 * get back in sync eventually.
149 /* Helper function to do delayed processing of ECN CWR chunk. */
150 static void sctp_do_ecn_cwr_work(struct sctp_association *asoc,
153 /* Turn off ECNE getting auto-prepended to every outgoing
159 /* Generate SACK if necessary. We call this at the end of a packet. */
160 static int sctp_gen_sack(struct sctp_association *asoc, int force,
161 sctp_cmd_seq_t *commands)
163 __u32 ctsn, max_tsn_seen;
164 struct sctp_chunk *sack;
165 struct sctp_transport *trans = asoc->peer.last_data_from;
169 (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) ||
170 (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE)))
171 asoc->peer.sack_needed = 1;
173 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
174 max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
176 /* From 12.2 Parameters necessary per association (i.e. the TCB):
178 * Ack State : This flag indicates if the next received packet
179 * : is to be responded to with a SACK. ...
180 * : When DATA chunks are out of order, SACK's
181 * : are not delayed (see Section 6).
183 * [This is actually not mentioned in Section 6, but we
184 * implement it here anyway. --piggy]
186 if (max_tsn_seen != ctsn)
187 asoc->peer.sack_needed = 1;
189 /* From 6.2 Acknowledgement on Reception of DATA Chunks:
191 * Section 4.2 of [RFC2581] SHOULD be followed. Specifically,
192 * an acknowledgement SHOULD be generated for at least every
193 * second packet (not every second DATA chunk) received, and
194 * SHOULD be generated within 200 ms of the arrival of any
195 * unacknowledged DATA chunk. ...
197 if (!asoc->peer.sack_needed) {
198 asoc->peer.sack_cnt++;
200 /* Set the SACK delay timeout based on the
201 * SACK delay for the last transport
202 * data was received from, or the default
203 * for the association.
206 /* We will need a SACK for the next packet. */
207 if (asoc->peer.sack_cnt >= trans->sackfreq - 1)
208 asoc->peer.sack_needed = 1;
210 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
213 /* We will need a SACK for the next packet. */
214 if (asoc->peer.sack_cnt >= asoc->sackfreq - 1)
215 asoc->peer.sack_needed = 1;
217 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
221 /* Restart the SACK timer. */
222 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
223 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
225 asoc->a_rwnd = asoc->rwnd;
226 sack = sctp_make_sack(asoc);
230 asoc->peer.sack_needed = 0;
231 asoc->peer.sack_cnt = 0;
233 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack));
235 /* Stop the SACK timer. */
236 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
237 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
246 /* When the T3-RTX timer expires, it calls this function to create the
247 * relevant state machine event.
249 void sctp_generate_t3_rtx_event(unsigned long peer)
252 struct sctp_transport *transport = (struct sctp_transport *) peer;
253 struct sctp_association *asoc = transport->asoc;
254 struct net *net = sock_net(asoc->base.sk);
256 /* Check whether a task is in the sock. */
258 sctp_bh_lock_sock(asoc->base.sk);
259 if (sock_owned_by_user(asoc->base.sk)) {
260 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__);
262 /* Try again later. */
263 if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20)))
264 sctp_transport_hold(transport);
268 /* Is this transport really dead and just waiting around for
269 * the timer to let go of the reference?
274 /* Run through the state machine. */
275 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
276 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX),
279 transport, GFP_ATOMIC);
282 asoc->base.sk->sk_err = -error;
285 sctp_bh_unlock_sock(asoc->base.sk);
286 sctp_transport_put(transport);
289 /* This is a sa interface for producing timeout events. It works
290 * for timeouts which use the association as their parameter.
292 static void sctp_generate_timeout_event(struct sctp_association *asoc,
293 sctp_event_timeout_t timeout_type)
295 struct net *net = sock_net(asoc->base.sk);
298 sctp_bh_lock_sock(asoc->base.sk);
299 if (sock_owned_by_user(asoc->base.sk)) {
300 SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n",
304 /* Try again later. */
305 if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20)))
306 sctp_association_hold(asoc);
310 /* Is this association really dead and just waiting around for
311 * the timer to let go of the reference?
316 /* Run through the state machine. */
317 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
318 SCTP_ST_TIMEOUT(timeout_type),
319 asoc->state, asoc->ep, asoc,
320 (void *)timeout_type, GFP_ATOMIC);
323 asoc->base.sk->sk_err = -error;
326 sctp_bh_unlock_sock(asoc->base.sk);
327 sctp_association_put(asoc);
330 static void sctp_generate_t1_cookie_event(unsigned long data)
332 struct sctp_association *asoc = (struct sctp_association *) data;
333 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE);
336 static void sctp_generate_t1_init_event(unsigned long data)
338 struct sctp_association *asoc = (struct sctp_association *) data;
339 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT);
342 static void sctp_generate_t2_shutdown_event(unsigned long data)
344 struct sctp_association *asoc = (struct sctp_association *) data;
345 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN);
348 static void sctp_generate_t4_rto_event(unsigned long data)
350 struct sctp_association *asoc = (struct sctp_association *) data;
351 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO);
354 static void sctp_generate_t5_shutdown_guard_event(unsigned long data)
356 struct sctp_association *asoc = (struct sctp_association *)data;
357 sctp_generate_timeout_event(asoc,
358 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD);
360 } /* sctp_generate_t5_shutdown_guard_event() */
362 static void sctp_generate_autoclose_event(unsigned long data)
364 struct sctp_association *asoc = (struct sctp_association *) data;
365 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE);
368 /* Generate a heart beat event. If the sock is busy, reschedule. Make
369 * sure that the transport is still valid.
371 void sctp_generate_heartbeat_event(unsigned long data)
374 struct sctp_transport *transport = (struct sctp_transport *) data;
375 struct sctp_association *asoc = transport->asoc;
376 struct net *net = sock_net(asoc->base.sk);
378 sctp_bh_lock_sock(asoc->base.sk);
379 if (sock_owned_by_user(asoc->base.sk)) {
380 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__);
382 /* Try again later. */
383 if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20)))
384 sctp_transport_hold(transport);
388 /* Is this structure just waiting around for us to actually
394 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
395 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT),
396 asoc->state, asoc->ep, asoc,
397 transport, GFP_ATOMIC);
400 asoc->base.sk->sk_err = -error;
403 sctp_bh_unlock_sock(asoc->base.sk);
404 sctp_transport_put(transport);
407 /* Handle the timeout of the ICMP protocol unreachable timer. Trigger
408 * the correct state machine transition that will close the association.
410 void sctp_generate_proto_unreach_event(unsigned long data)
412 struct sctp_transport *transport = (struct sctp_transport *) data;
413 struct sctp_association *asoc = transport->asoc;
414 struct net *net = sock_net(asoc->base.sk);
416 sctp_bh_lock_sock(asoc->base.sk);
417 if (sock_owned_by_user(asoc->base.sk)) {
418 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__);
420 /* Try again later. */
421 if (!mod_timer(&transport->proto_unreach_timer,
423 sctp_association_hold(asoc);
427 /* Is this structure just waiting around for us to actually
433 sctp_do_sm(net, SCTP_EVENT_T_OTHER,
434 SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH),
435 asoc->state, asoc->ep, asoc, transport, GFP_ATOMIC);
438 sctp_bh_unlock_sock(asoc->base.sk);
439 sctp_association_put(asoc);
443 /* Inject a SACK Timeout event into the state machine. */
444 static void sctp_generate_sack_event(unsigned long data)
446 struct sctp_association *asoc = (struct sctp_association *) data;
447 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK);
450 sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = {
452 sctp_generate_t1_cookie_event,
453 sctp_generate_t1_init_event,
454 sctp_generate_t2_shutdown_event,
456 sctp_generate_t4_rto_event,
457 sctp_generate_t5_shutdown_guard_event,
459 sctp_generate_sack_event,
460 sctp_generate_autoclose_event,
464 /* RFC 2960 8.2 Path Failure Detection
466 * When its peer endpoint is multi-homed, an endpoint should keep a
467 * error counter for each of the destination transport addresses of the
470 * Each time the T3-rtx timer expires on any address, or when a
471 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
472 * the error counter of that destination address will be incremented.
473 * When the value in the error counter exceeds the protocol parameter
474 * 'Path.Max.Retrans' of that destination address, the endpoint should
475 * mark the destination transport address as inactive, and a
476 * notification SHOULD be sent to the upper layer.
479 static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t *commands,
480 struct sctp_association *asoc,
481 struct sctp_transport *transport,
484 /* The check for association's overall error counter exceeding the
485 * threshold is done in the state function.
487 /* We are here due to a timer expiration. If the timer was
488 * not a HEARTBEAT, then normal error tracking is done.
489 * If the timer was a heartbeat, we only increment error counts
490 * when we already have an outstanding HEARTBEAT that has not
492 * Additionally, some tranport states inhibit error increments.
495 asoc->overall_error_count++;
496 if (transport->state != SCTP_INACTIVE)
497 transport->error_count++;
498 } else if (transport->hb_sent) {
499 if (transport->state != SCTP_UNCONFIRMED)
500 asoc->overall_error_count++;
501 if (transport->state != SCTP_INACTIVE)
502 transport->error_count++;
505 /* If the transport error count is greater than the pf_retrans
506 * threshold, and less than pathmaxrtx, then mark this transport
507 * as Partially Failed, ee SCTP Quick Failover Draft, secon 5.1,
510 if ((transport->state != SCTP_PF) &&
511 (asoc->pf_retrans < transport->pathmaxrxt) &&
512 (transport->error_count > asoc->pf_retrans)) {
514 sctp_assoc_control_transport(asoc, transport,
518 /* Update the hb timer to resend a heartbeat every rto */
519 sctp_cmd_hb_timer_update(commands, transport);
522 if (transport->state != SCTP_INACTIVE &&
523 (transport->error_count > transport->pathmaxrxt)) {
524 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
525 " transport IP: port:%d failed.\n",
527 (&transport->ipaddr),
528 ntohs(transport->ipaddr.v4.sin_port));
529 sctp_assoc_control_transport(asoc, transport,
531 SCTP_FAILED_THRESHOLD);
534 /* E2) For the destination address for which the timer
535 * expires, set RTO <- RTO * 2 ("back off the timer"). The
536 * maximum value discussed in rule C7 above (RTO.max) may be
537 * used to provide an upper bound to this doubling operation.
539 * Special Case: the first HB doesn't trigger exponential backoff.
540 * The first unacknowledged HB triggers it. We do this with a flag
541 * that indicates that we have an outstanding HB.
543 if (!is_hb || transport->hb_sent) {
544 transport->rto = min((transport->rto * 2), transport->asoc->rto_max);
545 sctp_max_rto(asoc, transport);
549 /* Worker routine to handle INIT command failure. */
550 static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands,
551 struct sctp_association *asoc,
554 struct sctp_ulpevent *event;
556 event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC,
557 (__u16)error, 0, 0, NULL,
561 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
562 SCTP_ULPEVENT(event));
564 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
565 SCTP_STATE(SCTP_STATE_CLOSED));
567 /* SEND_FAILED sent later when cleaning up the association. */
568 asoc->outqueue.error = error;
569 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
572 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
573 static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands,
574 struct sctp_association *asoc,
575 sctp_event_t event_type,
576 sctp_subtype_t subtype,
577 struct sctp_chunk *chunk,
580 struct sctp_ulpevent *event;
581 struct sctp_chunk *abort;
582 /* Cancel any partial delivery in progress. */
583 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
585 if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT)
586 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
587 (__u16)error, 0, 0, chunk,
590 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
591 (__u16)error, 0, 0, NULL,
594 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
595 SCTP_ULPEVENT(event));
597 if (asoc->overall_error_count >= asoc->max_retrans) {
598 abort = sctp_make_violation_max_retrans(asoc, chunk);
600 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
604 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
605 SCTP_STATE(SCTP_STATE_CLOSED));
607 /* SEND_FAILED sent later when cleaning up the association. */
608 asoc->outqueue.error = error;
609 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
612 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
613 * inside the cookie. In reality, this is only used for INIT-ACK processing
614 * since all other cases use "temporary" associations and can do all
615 * their work in statefuns directly.
617 static int sctp_cmd_process_init(sctp_cmd_seq_t *commands,
618 struct sctp_association *asoc,
619 struct sctp_chunk *chunk,
620 sctp_init_chunk_t *peer_init,
625 /* We only process the init as a sideeffect in a single
626 * case. This is when we process the INIT-ACK. If we
627 * fail during INIT processing (due to malloc problems),
628 * just return the error and stop processing the stack.
630 if (!sctp_process_init(asoc, chunk, sctp_source(chunk), peer_init, gfp))
638 /* Helper function to break out starting up of heartbeat timers. */
639 static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds,
640 struct sctp_association *asoc)
642 struct sctp_transport *t;
644 /* Start a heartbeat timer for each transport on the association.
645 * hold a reference on the transport to make sure none of
646 * the needed data structures go away.
648 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) {
650 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
651 sctp_transport_hold(t);
655 static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds,
656 struct sctp_association *asoc)
658 struct sctp_transport *t;
660 /* Stop all heartbeat timers. */
662 list_for_each_entry(t, &asoc->peer.transport_addr_list,
664 if (del_timer(&t->hb_timer))
665 sctp_transport_put(t);
669 /* Helper function to stop any pending T3-RTX timers */
670 static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds,
671 struct sctp_association *asoc)
673 struct sctp_transport *t;
675 list_for_each_entry(t, &asoc->peer.transport_addr_list,
677 if (del_timer(&t->T3_rtx_timer))
678 sctp_transport_put(t);
683 /* Helper function to update the heartbeat timer. */
684 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds,
685 struct sctp_transport *t)
687 /* Update the heartbeat timer. */
688 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
689 sctp_transport_hold(t);
692 /* Helper function to handle the reception of an HEARTBEAT ACK. */
693 static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
694 struct sctp_association *asoc,
695 struct sctp_transport *t,
696 struct sctp_chunk *chunk)
698 sctp_sender_hb_info_t *hbinfo;
699 int was_unconfirmed = 0;
701 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
702 * HEARTBEAT should clear the error counter of the destination
703 * transport address to which the HEARTBEAT was sent.
708 * Although RFC4960 specifies that the overall error count must
709 * be cleared when a HEARTBEAT ACK is received, we make an
710 * exception while in SHUTDOWN PENDING. If the peer keeps its
711 * window shut forever, we may never be able to transmit our
712 * outstanding data and rely on the retransmission limit be reached
713 * to shutdown the association.
715 if (t->asoc->state != SCTP_STATE_SHUTDOWN_PENDING)
716 t->asoc->overall_error_count = 0;
718 /* Clear the hb_sent flag to signal that we had a good
723 /* Mark the destination transport address as active if it is not so
726 if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) {
728 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
729 SCTP_HEARTBEAT_SUCCESS);
732 if (t->state == SCTP_PF)
733 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
734 SCTP_HEARTBEAT_SUCCESS);
736 /* The receiver of the HEARTBEAT ACK should also perform an
737 * RTT measurement for that destination transport address
738 * using the time value carried in the HEARTBEAT ACK chunk.
739 * If the transport's rto_pending variable has been cleared,
740 * it was most likely due to a retransmit. However, we want
741 * to re-enable it to properly update the rto.
743 if (t->rto_pending == 0)
746 hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data;
747 sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at));
749 /* Update the heartbeat timer. */
750 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t)))
751 sctp_transport_hold(t);
753 if (was_unconfirmed && asoc->peer.transport_count == 1)
754 sctp_transport_immediate_rtx(t);
758 /* Helper function to process the process SACK command. */
759 static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds,
760 struct sctp_association *asoc,
761 struct sctp_chunk *chunk)
765 if (sctp_outq_sack(&asoc->outqueue, chunk)) {
766 struct net *net = sock_net(asoc->base.sk);
768 /* There are no more TSNs awaiting SACK. */
769 err = sctp_do_sm(net, SCTP_EVENT_T_OTHER,
770 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN),
771 asoc->state, asoc->ep, asoc, NULL,
778 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
779 * the transport for a shutdown chunk.
781 static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds,
782 struct sctp_association *asoc,
783 struct sctp_chunk *chunk)
785 struct sctp_transport *t;
787 if (chunk->transport)
788 t = chunk->transport;
790 t = sctp_assoc_choose_alter_transport(asoc,
791 asoc->shutdown_last_sent_to);
792 chunk->transport = t;
794 asoc->shutdown_last_sent_to = t;
795 asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto;
798 /* Helper function to change the state of an association. */
799 static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds,
800 struct sctp_association *asoc,
803 struct sock *sk = asoc->base.sk;
807 SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n",
808 asoc, sctp_state_tbl[state]);
810 if (sctp_style(sk, TCP)) {
811 /* Change the sk->sk_state of a TCP-style socket that has
812 * successfully completed a connect() call.
814 if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED))
815 sk->sk_state = SCTP_SS_ESTABLISHED;
817 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
818 if (sctp_state(asoc, SHUTDOWN_RECEIVED) &&
819 sctp_sstate(sk, ESTABLISHED))
820 sk->sk_shutdown |= RCV_SHUTDOWN;
823 if (sctp_state(asoc, COOKIE_WAIT)) {
824 /* Reset init timeouts since they may have been
825 * increased due to timer expirations.
827 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
829 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
833 if (sctp_state(asoc, ESTABLISHED) ||
834 sctp_state(asoc, CLOSED) ||
835 sctp_state(asoc, SHUTDOWN_RECEIVED)) {
836 /* Wake up any processes waiting in the asoc's wait queue in
837 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
839 if (waitqueue_active(&asoc->wait))
840 wake_up_interruptible(&asoc->wait);
842 /* Wake up any processes waiting in the sk's sleep queue of
843 * a TCP-style or UDP-style peeled-off socket in
844 * sctp_wait_for_accept() or sctp_wait_for_packet().
845 * For a UDP-style socket, the waiters are woken up by the
848 if (!sctp_style(sk, UDP))
849 sk->sk_state_change(sk);
853 /* Helper function to delete an association. */
854 static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds,
855 struct sctp_association *asoc)
857 struct sock *sk = asoc->base.sk;
859 /* If it is a non-temporary association belonging to a TCP-style
860 * listening socket that is not closed, do not free it so that accept()
861 * can pick it up later.
863 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) &&
864 (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK))
867 BUG_ON(asoc->peer.primary_path == NULL);
868 sctp_unhash_established(asoc);
869 sctp_association_free(asoc);
873 * ADDIP Section 4.1 ASCONF Chunk Procedures
874 * A4) Start a T-4 RTO timer, using the RTO value of the selected
875 * destination address (we use active path instead of primary path just
876 * because primary path may be inactive.
878 static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds,
879 struct sctp_association *asoc,
880 struct sctp_chunk *chunk)
882 struct sctp_transport *t;
884 t = sctp_assoc_choose_alter_transport(asoc, chunk->transport);
885 asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto;
886 chunk->transport = t;
889 /* Process an incoming Operation Error Chunk. */
890 static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds,
891 struct sctp_association *asoc,
892 struct sctp_chunk *chunk)
894 struct sctp_errhdr *err_hdr;
895 struct sctp_ulpevent *ev;
897 while (chunk->chunk_end > chunk->skb->data) {
898 err_hdr = (struct sctp_errhdr *)(chunk->skb->data);
900 ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0,
905 sctp_ulpq_tail_event(&asoc->ulpq, ev);
907 switch (err_hdr->cause) {
908 case SCTP_ERROR_UNKNOWN_CHUNK:
910 sctp_chunkhdr_t *unk_chunk_hdr;
912 unk_chunk_hdr = (sctp_chunkhdr_t *)err_hdr->variable;
913 switch (unk_chunk_hdr->type) {
914 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with
915 * an ERROR chunk reporting that it did not recognized
916 * the ASCONF chunk type, the sender of the ASCONF MUST
917 * NOT send any further ASCONF chunks and MUST stop its
920 case SCTP_CID_ASCONF:
921 if (asoc->peer.asconf_capable == 0)
924 asoc->peer.asconf_capable = 0;
925 sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP,
926 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO));
939 /* Process variable FWDTSN chunk information. */
940 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq,
941 struct sctp_chunk *chunk)
943 struct sctp_fwdtsn_skip *skip;
944 /* Walk through all the skipped SSNs */
945 sctp_walk_fwdtsn(skip, chunk) {
946 sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn));
950 /* Helper function to remove the association non-primary peer
953 static void sctp_cmd_del_non_primary(struct sctp_association *asoc)
955 struct sctp_transport *t;
956 struct list_head *pos;
957 struct list_head *temp;
959 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
960 t = list_entry(pos, struct sctp_transport, transports);
961 if (!sctp_cmp_addr_exact(&t->ipaddr,
962 &asoc->peer.primary_addr)) {
963 sctp_assoc_del_peer(asoc, &t->ipaddr);
968 /* Helper function to set sk_err on a 1-1 style socket. */
969 static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error)
971 struct sock *sk = asoc->base.sk;
973 if (!sctp_style(sk, UDP))
977 /* Helper function to generate an association change event */
978 static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands,
979 struct sctp_association *asoc,
982 struct sctp_ulpevent *ev;
984 ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0,
985 asoc->c.sinit_num_ostreams,
986 asoc->c.sinit_max_instreams,
989 sctp_ulpq_tail_event(&asoc->ulpq, ev);
992 /* Helper function to generate an adaptation indication event */
993 static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands,
994 struct sctp_association *asoc)
996 struct sctp_ulpevent *ev;
998 ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC);
1001 sctp_ulpq_tail_event(&asoc->ulpq, ev);
1005 static void sctp_cmd_t1_timer_update(struct sctp_association *asoc,
1006 sctp_event_timeout_t timer,
1009 struct sctp_transport *t;
1011 t = asoc->init_last_sent_to;
1012 asoc->init_err_counter++;
1014 if (t->init_sent_count > (asoc->init_cycle + 1)) {
1015 asoc->timeouts[timer] *= 2;
1016 if (asoc->timeouts[timer] > asoc->max_init_timeo) {
1017 asoc->timeouts[timer] = asoc->max_init_timeo;
1021 "T1 %s Timeout adjustment"
1022 " init_err_counter: %d"
1026 asoc->init_err_counter,
1028 asoc->timeouts[timer]);
1033 /* Send the whole message, chunk by chunk, to the outqueue.
1034 * This way the whole message is queued up and bundling if
1035 * encouraged for small fragments.
1037 static int sctp_cmd_send_msg(struct sctp_association *asoc,
1038 struct sctp_datamsg *msg)
1040 struct sctp_chunk *chunk;
1043 list_for_each_entry(chunk, &msg->chunks, frag_list) {
1044 error = sctp_outq_tail(&asoc->outqueue, chunk);
1053 /* Sent the next ASCONF packet currently stored in the association.
1054 * This happens after the ASCONF_ACK was succeffully processed.
1056 static void sctp_cmd_send_asconf(struct sctp_association *asoc)
1058 struct net *net = sock_net(asoc->base.sk);
1060 /* Send the next asconf chunk from the addip chunk
1063 if (!list_empty(&asoc->addip_chunk_list)) {
1064 struct list_head *entry = asoc->addip_chunk_list.next;
1065 struct sctp_chunk *asconf = list_entry(entry,
1066 struct sctp_chunk, list);
1067 list_del_init(entry);
1069 /* Hold the chunk until an ASCONF_ACK is received. */
1070 sctp_chunk_hold(asconf);
1071 if (sctp_primitive_ASCONF(net, asoc, asconf))
1072 sctp_chunk_free(asconf);
1074 asoc->addip_last_asconf = asconf;
1079 /* These three macros allow us to pull the debugging code out of the
1080 * main flow of sctp_do_sm() to keep attention focused on the real
1081 * functionality there.
1084 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
1085 "ep %p, %s, %s, asoc %p[%s], %s\n", \
1086 ep, sctp_evttype_tbl[event_type], \
1087 (*debug_fn)(subtype), asoc, \
1088 sctp_state_tbl[state], state_fn->name)
1090 #define DEBUG_POST \
1091 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
1092 "asoc %p, status: %s\n", \
1093 asoc, sctp_status_tbl[status])
1095 #define DEBUG_POST_SFX \
1096 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
1098 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
1099 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
1102 * This is the master state machine processing function.
1104 * If you want to understand all of lksctp, this is a
1105 * good place to start.
1107 int sctp_do_sm(struct net *net, sctp_event_t event_type, sctp_subtype_t subtype,
1109 struct sctp_endpoint *ep,
1110 struct sctp_association *asoc,
1114 sctp_cmd_seq_t commands;
1115 const sctp_sm_table_entry_t *state_fn;
1116 sctp_disposition_t status;
1118 typedef const char *(printfn_t)(sctp_subtype_t);
1120 static printfn_t *table[] = {
1121 NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname,
1123 printfn_t *debug_fn __attribute__ ((unused)) = table[event_type];
1125 /* Look up the state function, run it, and then process the
1126 * side effects. These three steps are the heart of lksctp.
1128 state_fn = sctp_sm_lookup_event(net, event_type, state, subtype);
1130 sctp_init_cmd_seq(&commands);
1133 status = (*state_fn->fn)(net, ep, asoc, subtype, event_arg, &commands);
1136 error = sctp_side_effects(event_type, subtype, state,
1137 ep, asoc, event_arg, status,
1147 /*****************************************************************
1148 * This the master state function side effect processing function.
1149 *****************************************************************/
1150 static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype,
1152 struct sctp_endpoint *ep,
1153 struct sctp_association *asoc,
1155 sctp_disposition_t status,
1156 sctp_cmd_seq_t *commands,
1161 /* FIXME - Most of the dispositions left today would be categorized
1162 * as "exceptional" dispositions. For those dispositions, it
1163 * may not be proper to run through any of the commands at all.
1164 * For example, the command interpreter might be run only with
1165 * disposition SCTP_DISPOSITION_CONSUME.
1167 if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state,
1174 case SCTP_DISPOSITION_DISCARD:
1175 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
1176 "event_type %d, event_id %d\n",
1177 state, event_type, subtype.chunk);
1180 case SCTP_DISPOSITION_NOMEM:
1181 /* We ran out of memory, so we need to discard this
1184 /* BUG--we should now recover some memory, probably by
1190 case SCTP_DISPOSITION_DELETE_TCB:
1191 /* This should now be a command. */
1194 case SCTP_DISPOSITION_CONSUME:
1195 case SCTP_DISPOSITION_ABORT:
1197 * We should no longer have much work to do here as the
1198 * real work has been done as explicit commands above.
1202 case SCTP_DISPOSITION_VIOLATION:
1203 net_err_ratelimited("protocol violation state %d chunkid %d\n",
1204 state, subtype.chunk);
1207 case SCTP_DISPOSITION_NOT_IMPL:
1208 pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n",
1209 state, event_type, subtype.chunk);
1212 case SCTP_DISPOSITION_BUG:
1213 pr_err("bug in state %d, event_type %d, event_id %d\n",
1214 state, event_type, subtype.chunk);
1219 pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n",
1220 status, state, event_type, subtype.chunk);
1229 /********************************************************************
1230 * 2nd Level Abstractions
1231 ********************************************************************/
1233 /* This is the side-effect interpreter. */
1234 static int sctp_cmd_interpreter(sctp_event_t event_type,
1235 sctp_subtype_t subtype,
1237 struct sctp_endpoint *ep,
1238 struct sctp_association *asoc,
1240 sctp_disposition_t status,
1241 sctp_cmd_seq_t *commands,
1247 struct sctp_chunk *new_obj;
1248 struct sctp_chunk *chunk = NULL;
1249 struct sctp_packet *packet;
1250 struct timer_list *timer;
1251 unsigned long timeout;
1252 struct sctp_transport *t;
1253 struct sctp_sackhdr sackh;
1256 if (SCTP_EVENT_T_TIMEOUT != event_type)
1259 /* Note: This whole file is a huge candidate for rework.
1260 * For example, each command could either have its own handler, so
1261 * the loop would look like:
1263 * cmd->handle(x, y, z)
1266 while (NULL != (cmd = sctp_next_cmd(commands))) {
1267 switch (cmd->verb) {
1272 case SCTP_CMD_NEW_ASOC:
1273 /* Register a new association. */
1275 sctp_outq_uncork(&asoc->outqueue);
1279 /* Register with the endpoint. */
1280 asoc = cmd->obj.asoc;
1281 BUG_ON(asoc->peer.primary_path == NULL);
1282 sctp_endpoint_add_asoc(ep, asoc);
1283 sctp_hash_established(asoc);
1286 case SCTP_CMD_UPDATE_ASSOC:
1287 sctp_assoc_update(asoc, cmd->obj.asoc);
1290 case SCTP_CMD_PURGE_OUTQUEUE:
1291 sctp_outq_teardown(&asoc->outqueue);
1294 case SCTP_CMD_DELETE_TCB:
1296 sctp_outq_uncork(&asoc->outqueue);
1299 /* Delete the current association. */
1300 sctp_cmd_delete_tcb(commands, asoc);
1304 case SCTP_CMD_NEW_STATE:
1305 /* Enter a new state. */
1306 sctp_cmd_new_state(commands, asoc, cmd->obj.state);
1309 case SCTP_CMD_REPORT_TSN:
1310 /* Record the arrival of a TSN. */
1311 error = sctp_tsnmap_mark(&asoc->peer.tsn_map,
1312 cmd->obj.u32, NULL);
1315 case SCTP_CMD_REPORT_FWDTSN:
1316 /* Move the Cumulattive TSN Ack ahead. */
1317 sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32);
1319 /* purge the fragmentation queue */
1320 sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32);
1322 /* Abort any in progress partial delivery. */
1323 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
1326 case SCTP_CMD_PROCESS_FWDTSN:
1327 sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.chunk);
1330 case SCTP_CMD_GEN_SACK:
1331 /* Generate a Selective ACK.
1332 * The argument tells us whether to just count
1333 * the packet and MAYBE generate a SACK, or
1336 force = cmd->obj.i32;
1337 error = sctp_gen_sack(asoc, force, commands);
1340 case SCTP_CMD_PROCESS_SACK:
1341 /* Process an inbound SACK. */
1342 error = sctp_cmd_process_sack(commands, asoc,
1346 case SCTP_CMD_GEN_INIT_ACK:
1347 /* Generate an INIT ACK chunk. */
1348 new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC,
1353 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1354 SCTP_CHUNK(new_obj));
1357 case SCTP_CMD_PEER_INIT:
1358 /* Process a unified INIT from the peer.
1359 * Note: Only used during INIT-ACK processing. If
1360 * there is an error just return to the outter
1361 * layer which will bail.
1363 error = sctp_cmd_process_init(commands, asoc, chunk,
1364 cmd->obj.init, gfp);
1367 case SCTP_CMD_GEN_COOKIE_ECHO:
1368 /* Generate a COOKIE ECHO chunk. */
1369 new_obj = sctp_make_cookie_echo(asoc, chunk);
1372 sctp_chunk_free(cmd->obj.chunk);
1375 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1376 SCTP_CHUNK(new_obj));
1378 /* If there is an ERROR chunk to be sent along with
1379 * the COOKIE_ECHO, send it, too.
1382 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1383 SCTP_CHUNK(cmd->obj.chunk));
1385 if (new_obj->transport) {
1386 new_obj->transport->init_sent_count++;
1387 asoc->init_last_sent_to = new_obj->transport;
1390 /* FIXME - Eventually come up with a cleaner way to
1391 * enabling COOKIE-ECHO + DATA bundling during
1392 * multihoming stale cookie scenarios, the following
1393 * command plays with asoc->peer.retran_path to
1394 * avoid the problem of sending the COOKIE-ECHO and
1395 * DATA in different paths, which could result
1396 * in the association being ABORTed if the DATA chunk
1397 * is processed first by the server. Checking the
1398 * init error counter simply causes this command
1399 * to be executed only during failed attempts of
1400 * association establishment.
1402 if ((asoc->peer.retran_path !=
1403 asoc->peer.primary_path) &&
1404 (asoc->init_err_counter > 0)) {
1405 sctp_add_cmd_sf(commands,
1406 SCTP_CMD_FORCE_PRIM_RETRAN,
1412 case SCTP_CMD_GEN_SHUTDOWN:
1413 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1414 * Reset error counts.
1416 asoc->overall_error_count = 0;
1418 /* Generate a SHUTDOWN chunk. */
1419 new_obj = sctp_make_shutdown(asoc, chunk);
1422 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1423 SCTP_CHUNK(new_obj));
1426 case SCTP_CMD_CHUNK_ULP:
1427 /* Send a chunk to the sockets layer. */
1428 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1429 "chunk_up:", cmd->obj.chunk,
1430 "ulpq:", &asoc->ulpq);
1431 sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.chunk,
1435 case SCTP_CMD_EVENT_ULP:
1436 /* Send a notification to the sockets layer. */
1437 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1438 "event_up:",cmd->obj.ulpevent,
1439 "ulpq:",&asoc->ulpq);
1440 sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ulpevent);
1443 case SCTP_CMD_REPLY:
1444 /* If an caller has not already corked, do cork. */
1445 if (!asoc->outqueue.cork) {
1446 sctp_outq_cork(&asoc->outqueue);
1449 /* Send a chunk to our peer. */
1450 error = sctp_outq_tail(&asoc->outqueue, cmd->obj.chunk);
1453 case SCTP_CMD_SEND_PKT:
1454 /* Send a full packet to our peer. */
1455 packet = cmd->obj.packet;
1456 sctp_packet_transmit(packet);
1457 sctp_ootb_pkt_free(packet);
1460 case SCTP_CMD_T1_RETRAN:
1461 /* Mark a transport for retransmission. */
1462 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1466 case SCTP_CMD_RETRAN:
1467 /* Mark a transport for retransmission. */
1468 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1472 case SCTP_CMD_ECN_CE:
1473 /* Do delayed CE processing. */
1474 sctp_do_ecn_ce_work(asoc, cmd->obj.u32);
1477 case SCTP_CMD_ECN_ECNE:
1478 /* Do delayed ECNE processing. */
1479 new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32,
1482 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1483 SCTP_CHUNK(new_obj));
1486 case SCTP_CMD_ECN_CWR:
1487 /* Do delayed CWR processing. */
1488 sctp_do_ecn_cwr_work(asoc, cmd->obj.u32);
1491 case SCTP_CMD_SETUP_T2:
1492 sctp_cmd_setup_t2(commands, asoc, cmd->obj.chunk);
1495 case SCTP_CMD_TIMER_START_ONCE:
1496 timer = &asoc->timers[cmd->obj.to];
1498 if (timer_pending(timer))
1502 case SCTP_CMD_TIMER_START:
1503 timer = &asoc->timers[cmd->obj.to];
1504 timeout = asoc->timeouts[cmd->obj.to];
1507 timer->expires = jiffies + timeout;
1508 sctp_association_hold(asoc);
1512 case SCTP_CMD_TIMER_RESTART:
1513 timer = &asoc->timers[cmd->obj.to];
1514 timeout = asoc->timeouts[cmd->obj.to];
1515 if (!mod_timer(timer, jiffies + timeout))
1516 sctp_association_hold(asoc);
1519 case SCTP_CMD_TIMER_STOP:
1520 timer = &asoc->timers[cmd->obj.to];
1521 if (del_timer(timer))
1522 sctp_association_put(asoc);
1525 case SCTP_CMD_INIT_CHOOSE_TRANSPORT:
1526 chunk = cmd->obj.chunk;
1527 t = sctp_assoc_choose_alter_transport(asoc,
1528 asoc->init_last_sent_to);
1529 asoc->init_last_sent_to = t;
1530 chunk->transport = t;
1531 t->init_sent_count++;
1532 /* Set the new transport as primary */
1533 sctp_assoc_set_primary(asoc, t);
1536 case SCTP_CMD_INIT_RESTART:
1537 /* Do the needed accounting and updates
1538 * associated with restarting an initialization
1539 * timer. Only multiply the timeout by two if
1540 * all transports have been tried at the current
1543 sctp_cmd_t1_timer_update(asoc,
1544 SCTP_EVENT_TIMEOUT_T1_INIT,
1547 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
1548 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
1551 case SCTP_CMD_COOKIEECHO_RESTART:
1552 /* Do the needed accounting and updates
1553 * associated with restarting an initialization
1554 * timer. Only multiply the timeout by two if
1555 * all transports have been tried at the current
1558 sctp_cmd_t1_timer_update(asoc,
1559 SCTP_EVENT_TIMEOUT_T1_COOKIE,
1562 /* If we've sent any data bundled with
1563 * COOKIE-ECHO we need to resend.
1565 list_for_each_entry(t, &asoc->peer.transport_addr_list,
1567 sctp_retransmit_mark(&asoc->outqueue, t,
1571 sctp_add_cmd_sf(commands,
1572 SCTP_CMD_TIMER_RESTART,
1573 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE));
1576 case SCTP_CMD_INIT_FAILED:
1577 sctp_cmd_init_failed(commands, asoc, cmd->obj.err);
1580 case SCTP_CMD_ASSOC_FAILED:
1581 sctp_cmd_assoc_failed(commands, asoc, event_type,
1582 subtype, chunk, cmd->obj.err);
1585 case SCTP_CMD_INIT_COUNTER_INC:
1586 asoc->init_err_counter++;
1589 case SCTP_CMD_INIT_COUNTER_RESET:
1590 asoc->init_err_counter = 0;
1591 asoc->init_cycle = 0;
1592 list_for_each_entry(t, &asoc->peer.transport_addr_list,
1594 t->init_sent_count = 0;
1598 case SCTP_CMD_REPORT_DUP:
1599 sctp_tsnmap_mark_dup(&asoc->peer.tsn_map,
1603 case SCTP_CMD_REPORT_BAD_TAG:
1604 SCTP_DEBUG_PRINTK("vtag mismatch!\n");
1607 case SCTP_CMD_STRIKE:
1608 /* Mark one strike against a transport. */
1609 sctp_do_8_2_transport_strike(commands, asoc,
1610 cmd->obj.transport, 0);
1613 case SCTP_CMD_TRANSPORT_IDLE:
1614 t = cmd->obj.transport;
1615 sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE);
1618 case SCTP_CMD_TRANSPORT_HB_SENT:
1619 t = cmd->obj.transport;
1620 sctp_do_8_2_transport_strike(commands, asoc,
1625 case SCTP_CMD_TRANSPORT_ON:
1626 t = cmd->obj.transport;
1627 sctp_cmd_transport_on(commands, asoc, t, chunk);
1630 case SCTP_CMD_HB_TIMERS_START:
1631 sctp_cmd_hb_timers_start(commands, asoc);
1634 case SCTP_CMD_HB_TIMER_UPDATE:
1635 t = cmd->obj.transport;
1636 sctp_cmd_hb_timer_update(commands, t);
1639 case SCTP_CMD_HB_TIMERS_STOP:
1640 sctp_cmd_hb_timers_stop(commands, asoc);
1643 case SCTP_CMD_REPORT_ERROR:
1644 error = cmd->obj.error;
1647 case SCTP_CMD_PROCESS_CTSN:
1648 /* Dummy up a SACK for processing. */
1649 sackh.cum_tsn_ack = cmd->obj.be32;
1650 sackh.a_rwnd = asoc->peer.rwnd +
1651 asoc->outqueue.outstanding_bytes;
1652 sackh.num_gap_ack_blocks = 0;
1653 sackh.num_dup_tsns = 0;
1654 chunk->subh.sack_hdr = &sackh;
1655 sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK,
1659 case SCTP_CMD_DISCARD_PACKET:
1660 /* We need to discard the whole packet.
1661 * Uncork the queue since there might be
1664 chunk->pdiscard = 1;
1666 sctp_outq_uncork(&asoc->outqueue);
1671 case SCTP_CMD_RTO_PENDING:
1672 t = cmd->obj.transport;
1676 case SCTP_CMD_PART_DELIVER:
1677 sctp_ulpq_partial_delivery(&asoc->ulpq, GFP_ATOMIC);
1680 case SCTP_CMD_RENEGE:
1681 sctp_ulpq_renege(&asoc->ulpq, cmd->obj.chunk,
1685 case SCTP_CMD_SETUP_T4:
1686 sctp_cmd_setup_t4(commands, asoc, cmd->obj.chunk);
1689 case SCTP_CMD_PROCESS_OPERR:
1690 sctp_cmd_process_operr(commands, asoc, chunk);
1692 case SCTP_CMD_CLEAR_INIT_TAG:
1693 asoc->peer.i.init_tag = 0;
1695 case SCTP_CMD_DEL_NON_PRIMARY:
1696 sctp_cmd_del_non_primary(asoc);
1698 case SCTP_CMD_T3_RTX_TIMERS_STOP:
1699 sctp_cmd_t3_rtx_timers_stop(commands, asoc);
1701 case SCTP_CMD_FORCE_PRIM_RETRAN:
1702 t = asoc->peer.retran_path;
1703 asoc->peer.retran_path = asoc->peer.primary_path;
1704 error = sctp_outq_uncork(&asoc->outqueue);
1706 asoc->peer.retran_path = t;
1708 case SCTP_CMD_SET_SK_ERR:
1709 sctp_cmd_set_sk_err(asoc, cmd->obj.error);
1711 case SCTP_CMD_ASSOC_CHANGE:
1712 sctp_cmd_assoc_change(commands, asoc,
1715 case SCTP_CMD_ADAPTATION_IND:
1716 sctp_cmd_adaptation_ind(commands, asoc);
1719 case SCTP_CMD_ASSOC_SHKEY:
1720 error = sctp_auth_asoc_init_active_key(asoc,
1723 case SCTP_CMD_UPDATE_INITTAG:
1724 asoc->peer.i.init_tag = cmd->obj.u32;
1726 case SCTP_CMD_SEND_MSG:
1727 if (!asoc->outqueue.cork) {
1728 sctp_outq_cork(&asoc->outqueue);
1731 error = sctp_cmd_send_msg(asoc, cmd->obj.msg);
1733 case SCTP_CMD_SEND_NEXT_ASCONF:
1734 sctp_cmd_send_asconf(asoc);
1736 case SCTP_CMD_PURGE_ASCONF_QUEUE:
1737 sctp_asconf_queue_teardown(asoc);
1740 case SCTP_CMD_SET_ASOC:
1741 asoc = cmd->obj.asoc;
1745 pr_warn("Impossible command: %u\n",
1755 /* If this is in response to a received chunk, wait until
1756 * we are done with the packet to open the queue so that we don't
1757 * send multiple packets in response to a single request.
1759 if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) {
1760 if (chunk->end_of_packet || chunk->singleton)
1761 error = sctp_outq_uncork(&asoc->outqueue);
1762 } else if (local_cork)
1763 error = sctp_outq_uncork(&asoc->outqueue);