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, see
26 * <http://www.gnu.org/licenses/>.
28 * Please send any bug reports or fixes you make to the
30 * lksctp developers <linux-sctp@vger.kernel.org>
32 * Written or modified by:
33 * La Monte H.P. Yarroll <piggy@acm.org>
34 * Karl Knutson <karl@athena.chicago.il.us>
35 * Jon Grimm <jgrimm@austin.ibm.com>
36 * Hui Huang <hui.huang@nokia.com>
37 * Dajiang Zhang <dajiang.zhang@nokia.com>
38 * Daisy Chang <daisyc@us.ibm.com>
39 * Sridhar Samudrala <sri@us.ibm.com>
40 * Ardelle Fan <ardelle.fan@intel.com>
43 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
45 #include <linux/skbuff.h>
46 #include <linux/types.h>
47 #include <linux/socket.h>
49 #include <linux/gfp.h>
51 #include <net/sctp/sctp.h>
52 #include <net/sctp/sm.h>
54 static int sctp_cmd_interpreter(enum sctp_event event_type,
55 union sctp_subtype subtype,
56 enum sctp_state state,
57 struct sctp_endpoint *ep,
58 struct sctp_association *asoc,
60 enum sctp_disposition status,
61 struct sctp_cmd_seq *commands,
63 static int sctp_side_effects(enum sctp_event event_type,
64 union sctp_subtype subtype,
65 enum sctp_state state,
66 struct sctp_endpoint *ep,
67 struct sctp_association **asoc,
69 enum sctp_disposition status,
70 struct sctp_cmd_seq *commands,
73 /********************************************************************
75 ********************************************************************/
77 /* A helper function for delayed processing of INET ECN CE bit. */
78 static void sctp_do_ecn_ce_work(struct sctp_association *asoc,
81 /* Save the TSN away for comparison when we receive CWR */
83 asoc->last_ecne_tsn = lowest_tsn;
87 /* Helper function for delayed processing of SCTP ECNE chunk. */
88 /* RFC 2960 Appendix A
90 * RFC 2481 details a specific bit for a sender to send in
91 * the header of its next outbound TCP segment to indicate to
92 * its peer that it has reduced its congestion window. This
93 * is termed the CWR bit. For SCTP the same indication is made
94 * by including the CWR chunk. This chunk contains one data
95 * element, i.e. the TSN number that was sent in the ECNE chunk.
96 * This element represents the lowest TSN number in the datagram
97 * that was originally marked with the CE bit.
99 static struct sctp_chunk *sctp_do_ecn_ecne_work(struct sctp_association *asoc,
101 struct sctp_chunk *chunk)
103 struct sctp_chunk *repl;
105 /* Our previously transmitted packet ran into some congestion
106 * so we should take action by reducing cwnd and ssthresh
107 * and then ACK our peer that we we've done so by
111 /* First, try to determine if we want to actually lower
112 * our cwnd variables. Only lower them if the ECNE looks more
113 * recent than the last response.
115 if (TSN_lt(asoc->last_cwr_tsn, lowest_tsn)) {
116 struct sctp_transport *transport;
118 /* Find which transport's congestion variables
119 * need to be adjusted.
121 transport = sctp_assoc_lookup_tsn(asoc, lowest_tsn);
123 /* Update the congestion variables. */
125 sctp_transport_lower_cwnd(transport,
126 SCTP_LOWER_CWND_ECNE);
127 asoc->last_cwr_tsn = lowest_tsn;
130 /* Always try to quiet the other end. In case of lost CWR,
131 * resend last_cwr_tsn.
133 repl = sctp_make_cwr(asoc, asoc->last_cwr_tsn, chunk);
135 /* If we run out of memory, it will look like a lost CWR. We'll
136 * get back in sync eventually.
141 /* Helper function to do delayed processing of ECN CWR chunk. */
142 static void sctp_do_ecn_cwr_work(struct sctp_association *asoc,
145 /* Turn off ECNE getting auto-prepended to every outgoing
151 /* Generate SACK if necessary. We call this at the end of a packet. */
152 static int sctp_gen_sack(struct sctp_association *asoc, int force,
153 struct sctp_cmd_seq *commands)
155 struct sctp_transport *trans = asoc->peer.last_data_from;
156 __u32 ctsn, max_tsn_seen;
157 struct sctp_chunk *sack;
161 (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) ||
162 (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE)))
163 asoc->peer.sack_needed = 1;
165 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
166 max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map);
168 /* From 12.2 Parameters necessary per association (i.e. the TCB):
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).
175 * [This is actually not mentioned in Section 6, but we
176 * implement it here anyway. --piggy]
178 if (max_tsn_seen != ctsn)
179 asoc->peer.sack_needed = 1;
181 /* From 6.2 Acknowledgement on Reception of DATA Chunks:
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. ...
189 if (!asoc->peer.sack_needed) {
190 asoc->peer.sack_cnt++;
192 /* Set the SACK delay timeout based on the
193 * SACK delay for the last transport
194 * data was received from, or the default
195 * for the association.
198 /* We will need a SACK for the next packet. */
199 if (asoc->peer.sack_cnt >= trans->sackfreq - 1)
200 asoc->peer.sack_needed = 1;
202 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
205 /* We will need a SACK for the next packet. */
206 if (asoc->peer.sack_cnt >= asoc->sackfreq - 1)
207 asoc->peer.sack_needed = 1;
209 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
213 /* Restart the SACK timer. */
214 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
215 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
217 __u32 old_a_rwnd = asoc->a_rwnd;
219 asoc->a_rwnd = asoc->rwnd;
220 sack = sctp_make_sack(asoc);
222 asoc->a_rwnd = old_a_rwnd;
226 asoc->peer.sack_needed = 0;
227 asoc->peer.sack_cnt = 0;
229 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack));
231 /* Stop the SACK timer. */
232 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
233 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
242 /* When the T3-RTX timer expires, it calls this function to create the
243 * relevant state machine event.
245 void sctp_generate_t3_rtx_event(unsigned long peer)
247 struct sctp_transport *transport = (struct sctp_transport *) peer;
248 struct sctp_association *asoc = transport->asoc;
249 struct sock *sk = asoc->base.sk;
250 struct net *net = sock_net(sk);
253 /* Check whether a task is in the sock. */
256 if (sock_owned_by_user(sk)) {
257 pr_debug("%s: sock is busy\n", __func__);
259 /* Try again later. */
260 if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20)))
261 sctp_transport_hold(transport);
265 /* Run through the state machine. */
266 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
267 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX),
270 transport, GFP_ATOMIC);
277 sctp_transport_put(transport);
280 /* This is a sa interface for producing timeout events. It works
281 * for timeouts which use the association as their parameter.
283 static void sctp_generate_timeout_event(struct sctp_association *asoc,
284 enum sctp_event_timeout timeout_type)
286 struct sock *sk = asoc->base.sk;
287 struct net *net = sock_net(sk);
291 if (sock_owned_by_user(sk)) {
292 pr_debug("%s: sock is busy: timer %d\n", __func__,
295 /* Try again later. */
296 if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20)))
297 sctp_association_hold(asoc);
301 /* Is this association really dead and just waiting around for
302 * the timer to let go of the reference?
307 /* Run through the state machine. */
308 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
309 SCTP_ST_TIMEOUT(timeout_type),
310 asoc->state, asoc->ep, asoc,
311 (void *)timeout_type, GFP_ATOMIC);
318 sctp_association_put(asoc);
321 static void sctp_generate_t1_cookie_event(unsigned long data)
323 struct sctp_association *asoc = (struct sctp_association *) data;
324 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE);
327 static void sctp_generate_t1_init_event(unsigned long data)
329 struct sctp_association *asoc = (struct sctp_association *) data;
330 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT);
333 static void sctp_generate_t2_shutdown_event(unsigned long data)
335 struct sctp_association *asoc = (struct sctp_association *) data;
336 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN);
339 static void sctp_generate_t4_rto_event(unsigned long data)
341 struct sctp_association *asoc = (struct sctp_association *) data;
342 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO);
345 static void sctp_generate_t5_shutdown_guard_event(unsigned long data)
347 struct sctp_association *asoc = (struct sctp_association *)data;
348 sctp_generate_timeout_event(asoc,
349 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD);
351 } /* sctp_generate_t5_shutdown_guard_event() */
353 static void sctp_generate_autoclose_event(unsigned long data)
355 struct sctp_association *asoc = (struct sctp_association *) data;
356 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE);
359 /* Generate a heart beat event. If the sock is busy, reschedule. Make
360 * sure that the transport is still valid.
362 void sctp_generate_heartbeat_event(unsigned long data)
364 struct sctp_transport *transport = (struct sctp_transport *) data;
365 struct sctp_association *asoc = transport->asoc;
366 struct sock *sk = asoc->base.sk;
367 struct net *net = sock_net(sk);
368 u32 elapsed, timeout;
372 if (sock_owned_by_user(sk)) {
373 pr_debug("%s: sock is busy\n", __func__);
375 /* Try again later. */
376 if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20)))
377 sctp_transport_hold(transport);
381 /* Check if we should still send the heartbeat or reschedule */
382 elapsed = jiffies - transport->last_time_sent;
383 timeout = sctp_transport_timeout(transport);
384 if (elapsed < timeout) {
385 elapsed = timeout - elapsed;
386 if (!mod_timer(&transport->hb_timer, jiffies + elapsed))
387 sctp_transport_hold(transport);
391 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
392 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT),
393 asoc->state, asoc->ep, asoc,
394 transport, GFP_ATOMIC);
401 sctp_transport_put(transport);
404 /* Handle the timeout of the ICMP protocol unreachable timer. Trigger
405 * the correct state machine transition that will close the association.
407 void sctp_generate_proto_unreach_event(unsigned long data)
409 struct sctp_transport *transport = (struct sctp_transport *)data;
410 struct sctp_association *asoc = transport->asoc;
411 struct sock *sk = asoc->base.sk;
412 struct net *net = sock_net(sk);
415 if (sock_owned_by_user(sk)) {
416 pr_debug("%s: sock is busy\n", __func__);
418 /* Try again later. */
419 if (!mod_timer(&transport->proto_unreach_timer,
421 sctp_transport_hold(transport);
425 /* Is this structure just waiting around for us to actually
431 sctp_do_sm(net, SCTP_EVENT_T_OTHER,
432 SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH),
433 asoc->state, asoc->ep, asoc, transport, GFP_ATOMIC);
437 sctp_transport_put(transport);
440 /* Handle the timeout of the RE-CONFIG timer. */
441 void sctp_generate_reconf_event(unsigned long data)
443 struct sctp_transport *transport = (struct sctp_transport *)data;
444 struct sctp_association *asoc = transport->asoc;
445 struct sock *sk = asoc->base.sk;
446 struct net *net = sock_net(sk);
450 if (sock_owned_by_user(sk)) {
451 pr_debug("%s: sock is busy\n", __func__);
453 /* Try again later. */
454 if (!mod_timer(&transport->reconf_timer, jiffies + (HZ / 20)))
455 sctp_transport_hold(transport);
459 /* This happens when the response arrives after the timer is triggered. */
460 if (!asoc->strreset_chunk)
463 error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT,
464 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_RECONF),
465 asoc->state, asoc->ep, asoc,
466 transport, GFP_ATOMIC);
473 sctp_transport_put(transport);
476 /* Inject a SACK Timeout event into the state machine. */
477 static void sctp_generate_sack_event(unsigned long data)
479 struct sctp_association *asoc = (struct sctp_association *)data;
480 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK);
483 sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = {
485 sctp_generate_t1_cookie_event,
486 sctp_generate_t1_init_event,
487 sctp_generate_t2_shutdown_event,
489 sctp_generate_t4_rto_event,
490 sctp_generate_t5_shutdown_guard_event,
493 sctp_generate_sack_event,
494 sctp_generate_autoclose_event,
498 /* RFC 2960 8.2 Path Failure Detection
500 * When its peer endpoint is multi-homed, an endpoint should keep a
501 * error counter for each of the destination transport addresses of the
504 * Each time the T3-rtx timer expires on any address, or when a
505 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
506 * the error counter of that destination address will be incremented.
507 * When the value in the error counter exceeds the protocol parameter
508 * 'Path.Max.Retrans' of that destination address, the endpoint should
509 * mark the destination transport address as inactive, and a
510 * notification SHOULD be sent to the upper layer.
513 static void sctp_do_8_2_transport_strike(struct sctp_cmd_seq *commands,
514 struct sctp_association *asoc,
515 struct sctp_transport *transport,
518 struct net *net = sock_net(asoc->base.sk);
520 /* The check for association's overall error counter exceeding the
521 * threshold is done in the state function.
523 /* We are here due to a timer expiration. If the timer was
524 * not a HEARTBEAT, then normal error tracking is done.
525 * If the timer was a heartbeat, we only increment error counts
526 * when we already have an outstanding HEARTBEAT that has not
528 * Additionally, some tranport states inhibit error increments.
531 asoc->overall_error_count++;
532 if (transport->state != SCTP_INACTIVE)
533 transport->error_count++;
534 } else if (transport->hb_sent) {
535 if (transport->state != SCTP_UNCONFIRMED)
536 asoc->overall_error_count++;
537 if (transport->state != SCTP_INACTIVE)
538 transport->error_count++;
541 /* If the transport error count is greater than the pf_retrans
542 * threshold, and less than pathmaxrtx, and if the current state
543 * is SCTP_ACTIVE, then mark this transport as Partially Failed,
544 * see SCTP Quick Failover Draft, section 5.1
546 if (net->sctp.pf_enable &&
547 (transport->state == SCTP_ACTIVE) &&
548 (transport->error_count < transport->pathmaxrxt) &&
549 (transport->error_count > transport->pf_retrans)) {
551 sctp_assoc_control_transport(asoc, transport,
555 /* Update the hb timer to resend a heartbeat every rto */
556 sctp_transport_reset_hb_timer(transport);
559 if (transport->state != SCTP_INACTIVE &&
560 (transport->error_count > transport->pathmaxrxt)) {
561 pr_debug("%s: association:%p transport addr:%pISpc failed\n",
562 __func__, asoc, &transport->ipaddr.sa);
564 sctp_assoc_control_transport(asoc, transport,
566 SCTP_FAILED_THRESHOLD);
569 /* E2) For the destination address for which the timer
570 * expires, set RTO <- RTO * 2 ("back off the timer"). The
571 * maximum value discussed in rule C7 above (RTO.max) may be
572 * used to provide an upper bound to this doubling operation.
574 * Special Case: the first HB doesn't trigger exponential backoff.
575 * The first unacknowledged HB triggers it. We do this with a flag
576 * that indicates that we have an outstanding HB.
578 if (!is_hb || transport->hb_sent) {
579 transport->rto = min((transport->rto * 2), transport->asoc->rto_max);
580 sctp_max_rto(asoc, transport);
584 /* Worker routine to handle INIT command failure. */
585 static void sctp_cmd_init_failed(struct sctp_cmd_seq *commands,
586 struct sctp_association *asoc,
589 struct sctp_ulpevent *event;
591 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_CANT_STR_ASSOC,
592 (__u16)error, 0, 0, NULL,
596 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
597 SCTP_ULPEVENT(event));
599 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
600 SCTP_STATE(SCTP_STATE_CLOSED));
602 /* SEND_FAILED sent later when cleaning up the association. */
603 asoc->outqueue.error = error;
604 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
607 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
608 static void sctp_cmd_assoc_failed(struct sctp_cmd_seq *commands,
609 struct sctp_association *asoc,
610 enum sctp_event event_type,
611 union sctp_subtype subtype,
612 struct sctp_chunk *chunk,
615 struct sctp_ulpevent *event;
616 struct sctp_chunk *abort;
618 /* Cancel any partial delivery in progress. */
619 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
621 if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT)
622 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
623 (__u16)error, 0, 0, chunk,
626 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST,
627 (__u16)error, 0, 0, NULL,
630 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
631 SCTP_ULPEVENT(event));
633 if (asoc->overall_error_count >= asoc->max_retrans) {
634 abort = sctp_make_violation_max_retrans(asoc, chunk);
636 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
640 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
641 SCTP_STATE(SCTP_STATE_CLOSED));
643 /* SEND_FAILED sent later when cleaning up the association. */
644 asoc->outqueue.error = error;
645 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
648 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
649 * inside the cookie. In reality, this is only used for INIT-ACK processing
650 * since all other cases use "temporary" associations and can do all
651 * their work in statefuns directly.
653 static int sctp_cmd_process_init(struct sctp_cmd_seq *commands,
654 struct sctp_association *asoc,
655 struct sctp_chunk *chunk,
656 struct sctp_init_chunk *peer_init,
661 /* We only process the init as a sideeffect in a single
662 * case. This is when we process the INIT-ACK. If we
663 * fail during INIT processing (due to malloc problems),
664 * just return the error and stop processing the stack.
666 if (!sctp_process_init(asoc, chunk, sctp_source(chunk), peer_init, gfp))
674 /* Helper function to break out starting up of heartbeat timers. */
675 static void sctp_cmd_hb_timers_start(struct sctp_cmd_seq *cmds,
676 struct sctp_association *asoc)
678 struct sctp_transport *t;
680 /* Start a heartbeat timer for each transport on the association.
681 * hold a reference on the transport to make sure none of
682 * the needed data structures go away.
684 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
685 sctp_transport_reset_hb_timer(t);
688 static void sctp_cmd_hb_timers_stop(struct sctp_cmd_seq *cmds,
689 struct sctp_association *asoc)
691 struct sctp_transport *t;
693 /* Stop all heartbeat timers. */
695 list_for_each_entry(t, &asoc->peer.transport_addr_list,
697 if (del_timer(&t->hb_timer))
698 sctp_transport_put(t);
702 /* Helper function to stop any pending T3-RTX timers */
703 static void sctp_cmd_t3_rtx_timers_stop(struct sctp_cmd_seq *cmds,
704 struct sctp_association *asoc)
706 struct sctp_transport *t;
708 list_for_each_entry(t, &asoc->peer.transport_addr_list,
710 if (del_timer(&t->T3_rtx_timer))
711 sctp_transport_put(t);
716 /* Helper function to handle the reception of an HEARTBEAT ACK. */
717 static void sctp_cmd_transport_on(struct sctp_cmd_seq *cmds,
718 struct sctp_association *asoc,
719 struct sctp_transport *t,
720 struct sctp_chunk *chunk)
722 struct sctp_sender_hb_info *hbinfo;
723 int was_unconfirmed = 0;
725 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
726 * HEARTBEAT should clear the error counter of the destination
727 * transport address to which the HEARTBEAT was sent.
732 * Although RFC4960 specifies that the overall error count must
733 * be cleared when a HEARTBEAT ACK is received, we make an
734 * exception while in SHUTDOWN PENDING. If the peer keeps its
735 * window shut forever, we may never be able to transmit our
736 * outstanding data and rely on the retransmission limit be reached
737 * to shutdown the association.
739 if (t->asoc->state < SCTP_STATE_SHUTDOWN_PENDING)
740 t->asoc->overall_error_count = 0;
742 /* Clear the hb_sent flag to signal that we had a good
747 /* Mark the destination transport address as active if it is not so
750 if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) {
752 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
753 SCTP_HEARTBEAT_SUCCESS);
756 if (t->state == SCTP_PF)
757 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
758 SCTP_HEARTBEAT_SUCCESS);
760 /* HB-ACK was received for a the proper HB. Consider this
764 sctp_transport_dst_confirm(t);
766 /* The receiver of the HEARTBEAT ACK should also perform an
767 * RTT measurement for that destination transport address
768 * using the time value carried in the HEARTBEAT ACK chunk.
769 * If the transport's rto_pending variable has been cleared,
770 * it was most likely due to a retransmit. However, we want
771 * to re-enable it to properly update the rto.
773 if (t->rto_pending == 0)
776 hbinfo = (struct sctp_sender_hb_info *)chunk->skb->data;
777 sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at));
779 /* Update the heartbeat timer. */
780 sctp_transport_reset_hb_timer(t);
782 if (was_unconfirmed && asoc->peer.transport_count == 1)
783 sctp_transport_immediate_rtx(t);
787 /* Helper function to process the process SACK command. */
788 static int sctp_cmd_process_sack(struct sctp_cmd_seq *cmds,
789 struct sctp_association *asoc,
790 struct sctp_chunk *chunk)
794 if (sctp_outq_sack(&asoc->outqueue, chunk)) {
795 struct net *net = sock_net(asoc->base.sk);
797 /* There are no more TSNs awaiting SACK. */
798 err = sctp_do_sm(net, SCTP_EVENT_T_OTHER,
799 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN),
800 asoc->state, asoc->ep, asoc, NULL,
807 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
808 * the transport for a shutdown chunk.
810 static void sctp_cmd_setup_t2(struct sctp_cmd_seq *cmds,
811 struct sctp_association *asoc,
812 struct sctp_chunk *chunk)
814 struct sctp_transport *t;
816 if (chunk->transport)
817 t = chunk->transport;
819 t = sctp_assoc_choose_alter_transport(asoc,
820 asoc->shutdown_last_sent_to);
821 chunk->transport = t;
823 asoc->shutdown_last_sent_to = t;
824 asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto;
827 static void sctp_cmd_assoc_update(struct sctp_cmd_seq *cmds,
828 struct sctp_association *asoc,
829 struct sctp_association *new)
831 struct net *net = sock_net(asoc->base.sk);
832 struct sctp_chunk *abort;
834 if (!sctp_assoc_update(asoc, new))
837 abort = sctp_make_abort(asoc, NULL, sizeof(struct sctp_errhdr));
839 sctp_init_cause(abort, SCTP_ERROR_RSRC_LOW, 0);
840 sctp_add_cmd_sf(cmds, SCTP_CMD_REPLY, SCTP_CHUNK(abort));
842 sctp_add_cmd_sf(cmds, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNABORTED));
843 sctp_add_cmd_sf(cmds, SCTP_CMD_ASSOC_FAILED,
844 SCTP_PERR(SCTP_ERROR_RSRC_LOW));
845 SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS);
846 SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB);
849 /* Helper function to change the state of an association. */
850 static void sctp_cmd_new_state(struct sctp_cmd_seq *cmds,
851 struct sctp_association *asoc,
852 enum sctp_state state)
854 struct sock *sk = asoc->base.sk;
858 pr_debug("%s: asoc:%p[%s]\n", __func__, asoc, sctp_state_tbl[state]);
860 if (sctp_style(sk, TCP)) {
861 /* Change the sk->sk_state of a TCP-style socket that has
862 * successfully completed a connect() call.
864 if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED))
865 sk->sk_state = SCTP_SS_ESTABLISHED;
867 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
868 if (sctp_state(asoc, SHUTDOWN_RECEIVED) &&
869 sctp_sstate(sk, ESTABLISHED)) {
870 sk->sk_state = SCTP_SS_CLOSING;
871 sk->sk_shutdown |= RCV_SHUTDOWN;
875 if (sctp_state(asoc, COOKIE_WAIT)) {
876 /* Reset init timeouts since they may have been
877 * increased due to timer expirations.
879 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
881 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
885 if (sctp_state(asoc, ESTABLISHED)) {
886 kfree(asoc->peer.cookie);
887 asoc->peer.cookie = NULL;
890 if (sctp_state(asoc, ESTABLISHED) ||
891 sctp_state(asoc, CLOSED) ||
892 sctp_state(asoc, SHUTDOWN_RECEIVED)) {
893 /* Wake up any processes waiting in the asoc's wait queue in
894 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
896 if (waitqueue_active(&asoc->wait))
897 wake_up_interruptible(&asoc->wait);
899 /* Wake up any processes waiting in the sk's sleep queue of
900 * a TCP-style or UDP-style peeled-off socket in
901 * sctp_wait_for_accept() or sctp_wait_for_packet().
902 * For a UDP-style socket, the waiters are woken up by the
905 if (!sctp_style(sk, UDP))
906 sk->sk_state_change(sk);
909 if (sctp_state(asoc, SHUTDOWN_PENDING) &&
910 !sctp_outq_is_empty(&asoc->outqueue))
911 sctp_outq_uncork(&asoc->outqueue, GFP_ATOMIC);
914 /* Helper function to delete an association. */
915 static void sctp_cmd_delete_tcb(struct sctp_cmd_seq *cmds,
916 struct sctp_association *asoc)
918 struct sock *sk = asoc->base.sk;
920 /* If it is a non-temporary association belonging to a TCP-style
921 * listening socket that is not closed, do not free it so that accept()
922 * can pick it up later.
924 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) &&
925 (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK))
928 sctp_association_free(asoc);
932 * ADDIP Section 4.1 ASCONF Chunk Procedures
933 * A4) Start a T-4 RTO timer, using the RTO value of the selected
934 * destination address (we use active path instead of primary path just
935 * because primary path may be inactive.
937 static void sctp_cmd_setup_t4(struct sctp_cmd_seq *cmds,
938 struct sctp_association *asoc,
939 struct sctp_chunk *chunk)
941 struct sctp_transport *t;
943 t = sctp_assoc_choose_alter_transport(asoc, chunk->transport);
944 asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto;
945 chunk->transport = t;
948 /* Process an incoming Operation Error Chunk. */
949 static void sctp_cmd_process_operr(struct sctp_cmd_seq *cmds,
950 struct sctp_association *asoc,
951 struct sctp_chunk *chunk)
953 struct sctp_errhdr *err_hdr;
954 struct sctp_ulpevent *ev;
956 while (chunk->chunk_end > chunk->skb->data) {
957 err_hdr = (struct sctp_errhdr *)(chunk->skb->data);
959 ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0,
964 sctp_ulpq_tail_event(&asoc->ulpq, ev);
966 switch (err_hdr->cause) {
967 case SCTP_ERROR_UNKNOWN_CHUNK:
969 struct sctp_chunkhdr *unk_chunk_hdr;
971 unk_chunk_hdr = (struct sctp_chunkhdr *)
973 switch (unk_chunk_hdr->type) {
974 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with
975 * an ERROR chunk reporting that it did not recognized
976 * the ASCONF chunk type, the sender of the ASCONF MUST
977 * NOT send any further ASCONF chunks and MUST stop its
980 case SCTP_CID_ASCONF:
981 if (asoc->peer.asconf_capable == 0)
984 asoc->peer.asconf_capable = 0;
985 sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP,
986 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO));
999 /* Process variable FWDTSN chunk information. */
1000 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq,
1001 struct sctp_chunk *chunk)
1003 struct sctp_fwdtsn_skip *skip;
1005 /* Walk through all the skipped SSNs */
1006 sctp_walk_fwdtsn(skip, chunk) {
1007 sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn));
1011 /* Helper function to remove the association non-primary peer
1014 static void sctp_cmd_del_non_primary(struct sctp_association *asoc)
1016 struct sctp_transport *t;
1017 struct list_head *temp;
1018 struct list_head *pos;
1020 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
1021 t = list_entry(pos, struct sctp_transport, transports);
1022 if (!sctp_cmp_addr_exact(&t->ipaddr,
1023 &asoc->peer.primary_addr)) {
1024 sctp_assoc_rm_peer(asoc, t);
1029 /* Helper function to set sk_err on a 1-1 style socket. */
1030 static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error)
1032 struct sock *sk = asoc->base.sk;
1034 if (!sctp_style(sk, UDP))
1038 /* Helper function to generate an association change event */
1039 static void sctp_cmd_assoc_change(struct sctp_cmd_seq *commands,
1040 struct sctp_association *asoc,
1043 struct sctp_ulpevent *ev;
1045 ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0,
1046 asoc->c.sinit_num_ostreams,
1047 asoc->c.sinit_max_instreams,
1050 sctp_ulpq_tail_event(&asoc->ulpq, ev);
1053 /* Helper function to generate an adaptation indication event */
1054 static void sctp_cmd_adaptation_ind(struct sctp_cmd_seq *commands,
1055 struct sctp_association *asoc)
1057 struct sctp_ulpevent *ev;
1059 ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC);
1062 sctp_ulpq_tail_event(&asoc->ulpq, ev);
1066 static void sctp_cmd_t1_timer_update(struct sctp_association *asoc,
1067 enum sctp_event_timeout timer,
1070 struct sctp_transport *t;
1072 t = asoc->init_last_sent_to;
1073 asoc->init_err_counter++;
1075 if (t->init_sent_count > (asoc->init_cycle + 1)) {
1076 asoc->timeouts[timer] *= 2;
1077 if (asoc->timeouts[timer] > asoc->max_init_timeo) {
1078 asoc->timeouts[timer] = asoc->max_init_timeo;
1082 pr_debug("%s: T1[%s] timeout adjustment init_err_counter:%d"
1083 " cycle:%d timeout:%ld\n", __func__, name,
1084 asoc->init_err_counter, asoc->init_cycle,
1085 asoc->timeouts[timer]);
1090 /* Send the whole message, chunk by chunk, to the outqueue.
1091 * This way the whole message is queued up and bundling if
1092 * encouraged for small fragments.
1094 static void sctp_cmd_send_msg(struct sctp_association *asoc,
1095 struct sctp_datamsg *msg, gfp_t gfp)
1097 struct sctp_chunk *chunk;
1099 list_for_each_entry(chunk, &msg->chunks, frag_list)
1100 sctp_outq_tail(&asoc->outqueue, chunk, gfp);
1104 /* These three macros allow us to pull the debugging code out of the
1105 * main flow of sctp_do_sm() to keep attention focused on the real
1106 * functionality there.
1108 #define debug_pre_sfn() \
1109 pr_debug("%s[pre-fn]: ep:%p, %s, %s, asoc:%p[%s], %s\n", __func__, \
1110 ep, sctp_evttype_tbl[event_type], (*debug_fn)(subtype), \
1111 asoc, sctp_state_tbl[state], state_fn->name)
1113 #define debug_post_sfn() \
1114 pr_debug("%s[post-fn]: asoc:%p, status:%s\n", __func__, asoc, \
1115 sctp_status_tbl[status])
1117 #define debug_post_sfx() \
1118 pr_debug("%s[post-sfx]: error:%d, asoc:%p[%s]\n", __func__, error, \
1119 asoc, sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
1120 sctp_assoc2id(asoc))) ? asoc->state : SCTP_STATE_CLOSED])
1123 * This is the master state machine processing function.
1125 * If you want to understand all of lksctp, this is a
1126 * good place to start.
1128 int sctp_do_sm(struct net *net, enum sctp_event event_type,
1129 union sctp_subtype subtype, enum sctp_state state,
1130 struct sctp_endpoint *ep, struct sctp_association *asoc,
1131 void *event_arg, gfp_t gfp)
1133 typedef const char *(printfn_t)(union sctp_subtype);
1134 static printfn_t *table[] = {
1135 NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname,
1137 printfn_t *debug_fn __attribute__ ((unused)) = table[event_type];
1138 const struct sctp_sm_table_entry *state_fn;
1139 struct sctp_cmd_seq commands;
1140 enum sctp_disposition status;
1143 /* Look up the state function, run it, and then process the
1144 * side effects. These three steps are the heart of lksctp.
1146 state_fn = sctp_sm_lookup_event(net, event_type, state, subtype);
1148 sctp_init_cmd_seq(&commands);
1151 status = state_fn->fn(net, ep, asoc, subtype, event_arg, &commands);
1154 error = sctp_side_effects(event_type, subtype, state,
1155 ep, &asoc, event_arg, status,
1162 /*****************************************************************
1163 * This the master state function side effect processing function.
1164 *****************************************************************/
1165 static int sctp_side_effects(enum sctp_event event_type,
1166 union sctp_subtype subtype,
1167 enum sctp_state state,
1168 struct sctp_endpoint *ep,
1169 struct sctp_association **asoc,
1171 enum sctp_disposition status,
1172 struct sctp_cmd_seq *commands,
1177 /* FIXME - Most of the dispositions left today would be categorized
1178 * as "exceptional" dispositions. For those dispositions, it
1179 * may not be proper to run through any of the commands at all.
1180 * For example, the command interpreter might be run only with
1181 * disposition SCTP_DISPOSITION_CONSUME.
1183 if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state,
1190 case SCTP_DISPOSITION_DISCARD:
1191 pr_debug("%s: ignored sctp protocol event - state:%d, "
1192 "event_type:%d, event_id:%d\n", __func__, state,
1193 event_type, subtype.chunk);
1196 case SCTP_DISPOSITION_NOMEM:
1197 /* We ran out of memory, so we need to discard this
1200 /* BUG--we should now recover some memory, probably by
1206 case SCTP_DISPOSITION_DELETE_TCB:
1207 case SCTP_DISPOSITION_ABORT:
1208 /* This should now be a command. */
1212 case SCTP_DISPOSITION_CONSUME:
1214 * We should no longer have much work to do here as the
1215 * real work has been done as explicit commands above.
1219 case SCTP_DISPOSITION_VIOLATION:
1220 net_err_ratelimited("protocol violation state %d chunkid %d\n",
1221 state, subtype.chunk);
1224 case SCTP_DISPOSITION_NOT_IMPL:
1225 pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n",
1226 state, event_type, subtype.chunk);
1229 case SCTP_DISPOSITION_BUG:
1230 pr_err("bug in state %d, event_type %d, event_id %d\n",
1231 state, event_type, subtype.chunk);
1236 pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n",
1237 status, state, event_type, subtype.chunk);
1246 /********************************************************************
1247 * 2nd Level Abstractions
1248 ********************************************************************/
1250 /* This is the side-effect interpreter. */
1251 static int sctp_cmd_interpreter(enum sctp_event event_type,
1252 union sctp_subtype subtype,
1253 enum sctp_state state,
1254 struct sctp_endpoint *ep,
1255 struct sctp_association *asoc,
1257 enum sctp_disposition status,
1258 struct sctp_cmd_seq *commands,
1261 struct sctp_sock *sp = sctp_sk(ep->base.sk);
1262 struct sctp_chunk *chunk = NULL, *new_obj;
1263 struct sctp_packet *packet;
1264 struct sctp_sackhdr sackh;
1265 struct timer_list *timer;
1266 struct sctp_transport *t;
1267 unsigned long timeout;
1268 struct sctp_cmd *cmd;
1273 if (SCTP_EVENT_T_TIMEOUT != event_type)
1276 /* Note: This whole file is a huge candidate for rework.
1277 * For example, each command could either have its own handler, so
1278 * the loop would look like:
1280 * cmd->handle(x, y, z)
1283 while (NULL != (cmd = sctp_next_cmd(commands))) {
1284 switch (cmd->verb) {
1289 case SCTP_CMD_NEW_ASOC:
1290 /* Register a new association. */
1292 sctp_outq_uncork(&asoc->outqueue, gfp);
1296 /* Register with the endpoint. */
1297 asoc = cmd->obj.asoc;
1298 BUG_ON(asoc->peer.primary_path == NULL);
1299 sctp_endpoint_add_asoc(ep, asoc);
1302 case SCTP_CMD_UPDATE_ASSOC:
1303 sctp_cmd_assoc_update(commands, asoc, cmd->obj.asoc);
1306 case SCTP_CMD_PURGE_OUTQUEUE:
1307 sctp_outq_teardown(&asoc->outqueue);
1310 case SCTP_CMD_DELETE_TCB:
1312 sctp_outq_uncork(&asoc->outqueue, gfp);
1315 /* Delete the current association. */
1316 sctp_cmd_delete_tcb(commands, asoc);
1320 case SCTP_CMD_NEW_STATE:
1321 /* Enter a new state. */
1322 sctp_cmd_new_state(commands, asoc, cmd->obj.state);
1325 case SCTP_CMD_REPORT_TSN:
1326 /* Record the arrival of a TSN. */
1327 error = sctp_tsnmap_mark(&asoc->peer.tsn_map,
1328 cmd->obj.u32, NULL);
1331 case SCTP_CMD_REPORT_FWDTSN:
1332 /* Move the Cumulattive TSN Ack ahead. */
1333 sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32);
1335 /* purge the fragmentation queue */
1336 sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32);
1338 /* Abort any in progress partial delivery. */
1339 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC);
1342 case SCTP_CMD_PROCESS_FWDTSN:
1343 sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.chunk);
1346 case SCTP_CMD_GEN_SACK:
1347 /* Generate a Selective ACK.
1348 * The argument tells us whether to just count
1349 * the packet and MAYBE generate a SACK, or
1352 force = cmd->obj.i32;
1353 error = sctp_gen_sack(asoc, force, commands);
1356 case SCTP_CMD_PROCESS_SACK:
1357 /* Process an inbound SACK. */
1358 error = sctp_cmd_process_sack(commands, asoc,
1362 case SCTP_CMD_GEN_INIT_ACK:
1363 /* Generate an INIT ACK chunk. */
1364 new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC,
1371 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1372 SCTP_CHUNK(new_obj));
1375 case SCTP_CMD_PEER_INIT:
1376 /* Process a unified INIT from the peer.
1377 * Note: Only used during INIT-ACK processing. If
1378 * there is an error just return to the outter
1379 * layer which will bail.
1381 error = sctp_cmd_process_init(commands, asoc, chunk,
1382 cmd->obj.init, gfp);
1385 case SCTP_CMD_GEN_COOKIE_ECHO:
1386 /* Generate a COOKIE ECHO chunk. */
1387 new_obj = sctp_make_cookie_echo(asoc, chunk);
1390 sctp_chunk_free(cmd->obj.chunk);
1394 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1395 SCTP_CHUNK(new_obj));
1397 /* If there is an ERROR chunk to be sent along with
1398 * the COOKIE_ECHO, send it, too.
1401 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1402 SCTP_CHUNK(cmd->obj.chunk));
1404 if (new_obj->transport) {
1405 new_obj->transport->init_sent_count++;
1406 asoc->init_last_sent_to = new_obj->transport;
1409 /* FIXME - Eventually come up with a cleaner way to
1410 * enabling COOKIE-ECHO + DATA bundling during
1411 * multihoming stale cookie scenarios, the following
1412 * command plays with asoc->peer.retran_path to
1413 * avoid the problem of sending the COOKIE-ECHO and
1414 * DATA in different paths, which could result
1415 * in the association being ABORTed if the DATA chunk
1416 * is processed first by the server. Checking the
1417 * init error counter simply causes this command
1418 * to be executed only during failed attempts of
1419 * association establishment.
1421 if ((asoc->peer.retran_path !=
1422 asoc->peer.primary_path) &&
1423 (asoc->init_err_counter > 0)) {
1424 sctp_add_cmd_sf(commands,
1425 SCTP_CMD_FORCE_PRIM_RETRAN,
1431 case SCTP_CMD_GEN_SHUTDOWN:
1432 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1433 * Reset error counts.
1435 asoc->overall_error_count = 0;
1437 /* Generate a SHUTDOWN chunk. */
1438 new_obj = sctp_make_shutdown(asoc, chunk);
1443 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1444 SCTP_CHUNK(new_obj));
1447 case SCTP_CMD_CHUNK_ULP:
1448 /* Send a chunk to the sockets layer. */
1449 pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n",
1450 __func__, cmd->obj.chunk, &asoc->ulpq);
1452 sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.chunk,
1456 case SCTP_CMD_EVENT_ULP:
1457 /* Send a notification to the sockets layer. */
1458 pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n",
1459 __func__, cmd->obj.ulpevent, &asoc->ulpq);
1461 sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ulpevent);
1464 case SCTP_CMD_REPLY:
1465 /* If an caller has not already corked, do cork. */
1466 if (!asoc->outqueue.cork) {
1467 sctp_outq_cork(&asoc->outqueue);
1470 /* Send a chunk to our peer. */
1471 sctp_outq_tail(&asoc->outqueue, cmd->obj.chunk, gfp);
1474 case SCTP_CMD_SEND_PKT:
1475 /* Send a full packet to our peer. */
1476 packet = cmd->obj.packet;
1477 sctp_packet_transmit(packet, gfp);
1478 sctp_ootb_pkt_free(packet);
1481 case SCTP_CMD_T1_RETRAN:
1482 /* Mark a transport for retransmission. */
1483 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1487 case SCTP_CMD_RETRAN:
1488 /* Mark a transport for retransmission. */
1489 sctp_retransmit(&asoc->outqueue, cmd->obj.transport,
1493 case SCTP_CMD_ECN_CE:
1494 /* Do delayed CE processing. */
1495 sctp_do_ecn_ce_work(asoc, cmd->obj.u32);
1498 case SCTP_CMD_ECN_ECNE:
1499 /* Do delayed ECNE processing. */
1500 new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32,
1503 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
1504 SCTP_CHUNK(new_obj));
1507 case SCTP_CMD_ECN_CWR:
1508 /* Do delayed CWR processing. */
1509 sctp_do_ecn_cwr_work(asoc, cmd->obj.u32);
1512 case SCTP_CMD_SETUP_T2:
1513 sctp_cmd_setup_t2(commands, asoc, cmd->obj.chunk);
1516 case SCTP_CMD_TIMER_START_ONCE:
1517 timer = &asoc->timers[cmd->obj.to];
1519 if (timer_pending(timer))
1523 case SCTP_CMD_TIMER_START:
1524 timer = &asoc->timers[cmd->obj.to];
1525 timeout = asoc->timeouts[cmd->obj.to];
1528 timer->expires = jiffies + timeout;
1529 sctp_association_hold(asoc);
1533 case SCTP_CMD_TIMER_RESTART:
1534 timer = &asoc->timers[cmd->obj.to];
1535 timeout = asoc->timeouts[cmd->obj.to];
1536 if (!mod_timer(timer, jiffies + timeout))
1537 sctp_association_hold(asoc);
1540 case SCTP_CMD_TIMER_STOP:
1541 timer = &asoc->timers[cmd->obj.to];
1542 if (del_timer(timer))
1543 sctp_association_put(asoc);
1546 case SCTP_CMD_INIT_CHOOSE_TRANSPORT:
1547 chunk = cmd->obj.chunk;
1548 t = sctp_assoc_choose_alter_transport(asoc,
1549 asoc->init_last_sent_to);
1550 asoc->init_last_sent_to = t;
1551 chunk->transport = t;
1552 t->init_sent_count++;
1553 /* Set the new transport as primary */
1554 sctp_assoc_set_primary(asoc, t);
1557 case SCTP_CMD_INIT_RESTART:
1558 /* Do the needed accounting and updates
1559 * associated with restarting an initialization
1560 * timer. Only multiply the timeout by two if
1561 * all transports have been tried at the current
1564 sctp_cmd_t1_timer_update(asoc,
1565 SCTP_EVENT_TIMEOUT_T1_INIT,
1568 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
1569 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
1572 case SCTP_CMD_COOKIEECHO_RESTART:
1573 /* Do the needed accounting and updates
1574 * associated with restarting an initialization
1575 * timer. Only multiply the timeout by two if
1576 * all transports have been tried at the current
1579 sctp_cmd_t1_timer_update(asoc,
1580 SCTP_EVENT_TIMEOUT_T1_COOKIE,
1583 /* If we've sent any data bundled with
1584 * COOKIE-ECHO we need to resend.
1586 list_for_each_entry(t, &asoc->peer.transport_addr_list,
1588 sctp_retransmit_mark(&asoc->outqueue, t,
1592 sctp_add_cmd_sf(commands,
1593 SCTP_CMD_TIMER_RESTART,
1594 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE));
1597 case SCTP_CMD_INIT_FAILED:
1598 sctp_cmd_init_failed(commands, asoc, cmd->obj.u16);
1601 case SCTP_CMD_ASSOC_FAILED:
1602 sctp_cmd_assoc_failed(commands, asoc, event_type,
1603 subtype, chunk, cmd->obj.u16);
1606 case SCTP_CMD_INIT_COUNTER_INC:
1607 asoc->init_err_counter++;
1610 case SCTP_CMD_INIT_COUNTER_RESET:
1611 asoc->init_err_counter = 0;
1612 asoc->init_cycle = 0;
1613 list_for_each_entry(t, &asoc->peer.transport_addr_list,
1615 t->init_sent_count = 0;
1619 case SCTP_CMD_REPORT_DUP:
1620 sctp_tsnmap_mark_dup(&asoc->peer.tsn_map,
1624 case SCTP_CMD_REPORT_BAD_TAG:
1625 pr_debug("%s: vtag mismatch!\n", __func__);
1628 case SCTP_CMD_STRIKE:
1629 /* Mark one strike against a transport. */
1630 sctp_do_8_2_transport_strike(commands, asoc,
1631 cmd->obj.transport, 0);
1634 case SCTP_CMD_TRANSPORT_IDLE:
1635 t = cmd->obj.transport;
1636 sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE);
1639 case SCTP_CMD_TRANSPORT_HB_SENT:
1640 t = cmd->obj.transport;
1641 sctp_do_8_2_transport_strike(commands, asoc,
1646 case SCTP_CMD_TRANSPORT_ON:
1647 t = cmd->obj.transport;
1648 sctp_cmd_transport_on(commands, asoc, t, chunk);
1651 case SCTP_CMD_HB_TIMERS_START:
1652 sctp_cmd_hb_timers_start(commands, asoc);
1655 case SCTP_CMD_HB_TIMER_UPDATE:
1656 t = cmd->obj.transport;
1657 sctp_transport_reset_hb_timer(t);
1660 case SCTP_CMD_HB_TIMERS_STOP:
1661 sctp_cmd_hb_timers_stop(commands, asoc);
1664 case SCTP_CMD_REPORT_ERROR:
1665 error = cmd->obj.error;
1668 case SCTP_CMD_PROCESS_CTSN:
1669 /* Dummy up a SACK for processing. */
1670 sackh.cum_tsn_ack = cmd->obj.be32;
1671 sackh.a_rwnd = htonl(asoc->peer.rwnd +
1672 asoc->outqueue.outstanding_bytes);
1673 sackh.num_gap_ack_blocks = 0;
1674 sackh.num_dup_tsns = 0;
1675 chunk->subh.sack_hdr = &sackh;
1676 sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK,
1680 case SCTP_CMD_DISCARD_PACKET:
1681 /* We need to discard the whole packet.
1682 * Uncork the queue since there might be
1685 chunk->pdiscard = 1;
1687 sctp_outq_uncork(&asoc->outqueue, gfp);
1692 case SCTP_CMD_RTO_PENDING:
1693 t = cmd->obj.transport;
1697 case SCTP_CMD_PART_DELIVER:
1698 sctp_ulpq_partial_delivery(&asoc->ulpq, GFP_ATOMIC);
1701 case SCTP_CMD_RENEGE:
1702 sctp_ulpq_renege(&asoc->ulpq, cmd->obj.chunk,
1706 case SCTP_CMD_SETUP_T4:
1707 sctp_cmd_setup_t4(commands, asoc, cmd->obj.chunk);
1710 case SCTP_CMD_PROCESS_OPERR:
1711 sctp_cmd_process_operr(commands, asoc, chunk);
1713 case SCTP_CMD_CLEAR_INIT_TAG:
1714 asoc->peer.i.init_tag = 0;
1716 case SCTP_CMD_DEL_NON_PRIMARY:
1717 sctp_cmd_del_non_primary(asoc);
1719 case SCTP_CMD_T3_RTX_TIMERS_STOP:
1720 sctp_cmd_t3_rtx_timers_stop(commands, asoc);
1722 case SCTP_CMD_FORCE_PRIM_RETRAN:
1723 t = asoc->peer.retran_path;
1724 asoc->peer.retran_path = asoc->peer.primary_path;
1725 sctp_outq_uncork(&asoc->outqueue, gfp);
1727 asoc->peer.retran_path = t;
1729 case SCTP_CMD_SET_SK_ERR:
1730 sctp_cmd_set_sk_err(asoc, cmd->obj.error);
1732 case SCTP_CMD_ASSOC_CHANGE:
1733 sctp_cmd_assoc_change(commands, asoc,
1736 case SCTP_CMD_ADAPTATION_IND:
1737 sctp_cmd_adaptation_ind(commands, asoc);
1740 case SCTP_CMD_ASSOC_SHKEY:
1741 error = sctp_auth_asoc_init_active_key(asoc,
1744 case SCTP_CMD_UPDATE_INITTAG:
1745 asoc->peer.i.init_tag = cmd->obj.u32;
1747 case SCTP_CMD_SEND_MSG:
1748 if (!asoc->outqueue.cork) {
1749 sctp_outq_cork(&asoc->outqueue);
1752 sctp_cmd_send_msg(asoc, cmd->obj.msg, gfp);
1754 case SCTP_CMD_PURGE_ASCONF_QUEUE:
1755 sctp_asconf_queue_teardown(asoc);
1758 case SCTP_CMD_SET_ASOC:
1759 if (asoc && local_cork) {
1760 sctp_outq_uncork(&asoc->outqueue, gfp);
1763 asoc = cmd->obj.asoc;
1767 pr_warn("Impossible command: %u\n",
1773 cmd = sctp_next_cmd(commands);
1775 if (cmd->verb == SCTP_CMD_REPLY)
1776 sctp_chunk_free(cmd->obj.chunk);
1777 cmd = sctp_next_cmd(commands);
1783 /* If this is in response to a received chunk, wait until
1784 * we are done with the packet to open the queue so that we don't
1785 * send multiple packets in response to a single request.
1787 if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) {
1788 if (chunk->end_of_packet || chunk->singleton)
1789 sctp_outq_uncork(&asoc->outqueue, gfp);
1790 } else if (local_cork)
1791 sctp_outq_uncork(&asoc->outqueue, gfp);
1793 if (sp->data_ready_signalled)
1794 sp->data_ready_signalled = 0;