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(sctp_event_t event_type
,
55 sctp_subtype_t subtype
,
57 struct sctp_endpoint
*ep
,
58 struct sctp_association
*asoc
,
60 sctp_disposition_t status
,
61 sctp_cmd_seq_t
*commands
,
63 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
65 struct sctp_endpoint
*ep
,
66 struct sctp_association
**asoc
,
68 sctp_disposition_t status
,
69 sctp_cmd_seq_t
*commands
,
72 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t
*cmds
,
73 struct sctp_transport
*t
);
74 /********************************************************************
76 ********************************************************************/
78 /* A helper function for delayed processing of INET ECN CE bit. */
79 static void sctp_do_ecn_ce_work(struct sctp_association
*asoc
,
82 /* Save the TSN away for comparison when we receive CWR */
84 asoc
->last_ecne_tsn
= lowest_tsn
;
88 /* Helper function for delayed processing of SCTP ECNE chunk. */
89 /* RFC 2960 Appendix A
91 * RFC 2481 details a specific bit for a sender to send in
92 * the header of its next outbound TCP segment to indicate to
93 * its peer that it has reduced its congestion window. This
94 * is termed the CWR bit. For SCTP the same indication is made
95 * by including the CWR chunk. This chunk contains one data
96 * element, i.e. the TSN number that was sent in the ECNE chunk.
97 * This element represents the lowest TSN number in the datagram
98 * that was originally marked with the CE bit.
100 static struct sctp_chunk
*sctp_do_ecn_ecne_work(struct sctp_association
*asoc
,
102 struct sctp_chunk
*chunk
)
104 struct sctp_chunk
*repl
;
106 /* Our previously transmitted packet ran into some congestion
107 * so we should take action by reducing cwnd and ssthresh
108 * and then ACK our peer that we we've done so by
112 /* First, try to determine if we want to actually lower
113 * our cwnd variables. Only lower them if the ECNE looks more
114 * recent than the last response.
116 if (TSN_lt(asoc
->last_cwr_tsn
, lowest_tsn
)) {
117 struct sctp_transport
*transport
;
119 /* Find which transport's congestion variables
120 * need to be adjusted.
122 transport
= sctp_assoc_lookup_tsn(asoc
, lowest_tsn
);
124 /* Update the congestion variables. */
126 sctp_transport_lower_cwnd(transport
,
127 SCTP_LOWER_CWND_ECNE
);
128 asoc
->last_cwr_tsn
= lowest_tsn
;
131 /* Always try to quiet the other end. In case of lost CWR,
132 * resend last_cwr_tsn.
134 repl
= sctp_make_cwr(asoc
, asoc
->last_cwr_tsn
, chunk
);
136 /* If we run out of memory, it will look like a lost CWR. We'll
137 * get back in sync eventually.
142 /* Helper function to do delayed processing of ECN CWR chunk. */
143 static void sctp_do_ecn_cwr_work(struct sctp_association
*asoc
,
146 /* Turn off ECNE getting auto-prepended to every outgoing
152 /* Generate SACK if necessary. We call this at the end of a packet. */
153 static int sctp_gen_sack(struct sctp_association
*asoc
, int force
,
154 sctp_cmd_seq_t
*commands
)
156 __u32 ctsn
, max_tsn_seen
;
157 struct sctp_chunk
*sack
;
158 struct sctp_transport
*trans
= asoc
->peer
.last_data_from
;
162 (!trans
&& (asoc
->param_flags
& SPP_SACKDELAY_DISABLE
)) ||
163 (trans
&& (trans
->param_flags
& SPP_SACKDELAY_DISABLE
)))
164 asoc
->peer
.sack_needed
= 1;
166 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
167 max_tsn_seen
= sctp_tsnmap_get_max_tsn_seen(&asoc
->peer
.tsn_map
);
169 /* From 12.2 Parameters necessary per association (i.e. the TCB):
171 * Ack State : This flag indicates if the next received packet
172 * : is to be responded to with a SACK. ...
173 * : When DATA chunks are out of order, SACK's
174 * : are not delayed (see Section 6).
176 * [This is actually not mentioned in Section 6, but we
177 * implement it here anyway. --piggy]
179 if (max_tsn_seen
!= ctsn
)
180 asoc
->peer
.sack_needed
= 1;
182 /* From 6.2 Acknowledgement on Reception of DATA Chunks:
184 * Section 4.2 of [RFC2581] SHOULD be followed. Specifically,
185 * an acknowledgement SHOULD be generated for at least every
186 * second packet (not every second DATA chunk) received, and
187 * SHOULD be generated within 200 ms of the arrival of any
188 * unacknowledged DATA chunk. ...
190 if (!asoc
->peer
.sack_needed
) {
191 asoc
->peer
.sack_cnt
++;
193 /* Set the SACK delay timeout based on the
194 * SACK delay for the last transport
195 * data was received from, or the default
196 * for the association.
199 /* We will need a SACK for the next packet. */
200 if (asoc
->peer
.sack_cnt
>= trans
->sackfreq
- 1)
201 asoc
->peer
.sack_needed
= 1;
203 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
206 /* We will need a SACK for the next packet. */
207 if (asoc
->peer
.sack_cnt
>= asoc
->sackfreq
- 1)
208 asoc
->peer
.sack_needed
= 1;
210 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
214 /* Restart the SACK timer. */
215 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
216 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
218 asoc
->a_rwnd
= asoc
->rwnd
;
219 sack
= sctp_make_sack(asoc
);
223 asoc
->peer
.sack_needed
= 0;
224 asoc
->peer
.sack_cnt
= 0;
226 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
, SCTP_CHUNK(sack
));
228 /* Stop the SACK timer. */
229 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_STOP
,
230 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
239 /* When the T3-RTX timer expires, it calls this function to create the
240 * relevant state machine event.
242 void sctp_generate_t3_rtx_event(unsigned long peer
)
245 struct sctp_transport
*transport
= (struct sctp_transport
*) peer
;
246 struct sctp_association
*asoc
= transport
->asoc
;
247 struct sock
*sk
= asoc
->base
.sk
;
248 struct net
*net
= sock_net(sk
);
250 /* Check whether a task is in the sock. */
253 if (sock_owned_by_user(sk
)) {
254 pr_debug("%s: sock is busy\n", __func__
);
256 /* Try again later. */
257 if (!mod_timer(&transport
->T3_rtx_timer
, jiffies
+ (HZ
/20)))
258 sctp_transport_hold(transport
);
262 /* Run through the state machine. */
263 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
264 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX
),
267 transport
, GFP_ATOMIC
);
274 sctp_transport_put(transport
);
277 /* This is a sa interface for producing timeout events. It works
278 * for timeouts which use the association as their parameter.
280 static void sctp_generate_timeout_event(struct sctp_association
*asoc
,
281 sctp_event_timeout_t timeout_type
)
283 struct sock
*sk
= asoc
->base
.sk
;
284 struct net
*net
= sock_net(sk
);
288 if (sock_owned_by_user(sk
)) {
289 pr_debug("%s: sock is busy: timer %d\n", __func__
,
292 /* Try again later. */
293 if (!mod_timer(&asoc
->timers
[timeout_type
], jiffies
+ (HZ
/20)))
294 sctp_association_hold(asoc
);
298 /* Is this association really dead and just waiting around for
299 * the timer to let go of the reference?
304 /* Run through the state machine. */
305 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
306 SCTP_ST_TIMEOUT(timeout_type
),
307 asoc
->state
, asoc
->ep
, asoc
,
308 (void *)timeout_type
, GFP_ATOMIC
);
315 sctp_association_put(asoc
);
318 static void sctp_generate_t1_cookie_event(unsigned long data
)
320 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
321 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_COOKIE
);
324 static void sctp_generate_t1_init_event(unsigned long data
)
326 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
327 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_INIT
);
330 static void sctp_generate_t2_shutdown_event(unsigned long data
)
332 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
333 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
);
336 static void sctp_generate_t4_rto_event(unsigned long data
)
338 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
339 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T4_RTO
);
342 static void sctp_generate_t5_shutdown_guard_event(unsigned long data
)
344 struct sctp_association
*asoc
= (struct sctp_association
*)data
;
345 sctp_generate_timeout_event(asoc
,
346 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD
);
348 } /* sctp_generate_t5_shutdown_guard_event() */
350 static void sctp_generate_autoclose_event(unsigned long data
)
352 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
353 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_AUTOCLOSE
);
356 /* Generate a heart beat event. If the sock is busy, reschedule. Make
357 * sure that the transport is still valid.
359 void sctp_generate_heartbeat_event(unsigned long data
)
362 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
363 struct sctp_association
*asoc
= transport
->asoc
;
364 struct sock
*sk
= asoc
->base
.sk
;
365 struct net
*net
= sock_net(sk
);
368 if (sock_owned_by_user(sk
)) {
369 pr_debug("%s: sock is busy\n", __func__
);
371 /* Try again later. */
372 if (!mod_timer(&transport
->hb_timer
, jiffies
+ (HZ
/20)))
373 sctp_transport_hold(transport
);
377 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
378 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT
),
379 asoc
->state
, asoc
->ep
, asoc
,
380 transport
, GFP_ATOMIC
);
387 sctp_transport_put(transport
);
390 /* Handle the timeout of the ICMP protocol unreachable timer. Trigger
391 * the correct state machine transition that will close the association.
393 void sctp_generate_proto_unreach_event(unsigned long data
)
395 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
396 struct sctp_association
*asoc
= transport
->asoc
;
397 struct sock
*sk
= asoc
->base
.sk
;
398 struct net
*net
= sock_net(sk
);
401 if (sock_owned_by_user(sk
)) {
402 pr_debug("%s: sock is busy\n", __func__
);
404 /* Try again later. */
405 if (!mod_timer(&transport
->proto_unreach_timer
,
407 sctp_association_hold(asoc
);
411 /* Is this structure just waiting around for us to actually
417 sctp_do_sm(net
, SCTP_EVENT_T_OTHER
,
418 SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH
),
419 asoc
->state
, asoc
->ep
, asoc
, transport
, GFP_ATOMIC
);
423 sctp_association_put(asoc
);
427 /* Inject a SACK Timeout event into the state machine. */
428 static void sctp_generate_sack_event(unsigned long data
)
430 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
431 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_SACK
);
434 sctp_timer_event_t
*sctp_timer_events
[SCTP_NUM_TIMEOUT_TYPES
] = {
436 sctp_generate_t1_cookie_event
,
437 sctp_generate_t1_init_event
,
438 sctp_generate_t2_shutdown_event
,
440 sctp_generate_t4_rto_event
,
441 sctp_generate_t5_shutdown_guard_event
,
443 sctp_generate_sack_event
,
444 sctp_generate_autoclose_event
,
448 /* RFC 2960 8.2 Path Failure Detection
450 * When its peer endpoint is multi-homed, an endpoint should keep a
451 * error counter for each of the destination transport addresses of the
454 * Each time the T3-rtx timer expires on any address, or when a
455 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
456 * the error counter of that destination address will be incremented.
457 * When the value in the error counter exceeds the protocol parameter
458 * 'Path.Max.Retrans' of that destination address, the endpoint should
459 * mark the destination transport address as inactive, and a
460 * notification SHOULD be sent to the upper layer.
463 static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t
*commands
,
464 struct sctp_association
*asoc
,
465 struct sctp_transport
*transport
,
468 struct net
*net
= sock_net(asoc
->base
.sk
);
470 /* The check for association's overall error counter exceeding the
471 * threshold is done in the state function.
473 /* We are here due to a timer expiration. If the timer was
474 * not a HEARTBEAT, then normal error tracking is done.
475 * If the timer was a heartbeat, we only increment error counts
476 * when we already have an outstanding HEARTBEAT that has not
478 * Additionally, some tranport states inhibit error increments.
481 asoc
->overall_error_count
++;
482 if (transport
->state
!= SCTP_INACTIVE
)
483 transport
->error_count
++;
484 } else if (transport
->hb_sent
) {
485 if (transport
->state
!= SCTP_UNCONFIRMED
)
486 asoc
->overall_error_count
++;
487 if (transport
->state
!= SCTP_INACTIVE
)
488 transport
->error_count
++;
491 /* If the transport error count is greater than the pf_retrans
492 * threshold, and less than pathmaxrtx, and if the current state
493 * is SCTP_ACTIVE, then mark this transport as Partially Failed,
494 * see SCTP Quick Failover Draft, section 5.1
496 if (net
->sctp
.pf_enable
&&
497 (transport
->state
== SCTP_ACTIVE
) &&
498 (asoc
->pf_retrans
< transport
->pathmaxrxt
) &&
499 (transport
->error_count
> asoc
->pf_retrans
)) {
501 sctp_assoc_control_transport(asoc
, transport
,
505 /* Update the hb timer to resend a heartbeat every rto */
506 sctp_cmd_hb_timer_update(commands
, transport
);
509 if (transport
->state
!= SCTP_INACTIVE
&&
510 (transport
->error_count
> transport
->pathmaxrxt
)) {
511 pr_debug("%s: association:%p transport addr:%pISpc failed\n",
512 __func__
, asoc
, &transport
->ipaddr
.sa
);
514 sctp_assoc_control_transport(asoc
, transport
,
516 SCTP_FAILED_THRESHOLD
);
519 /* E2) For the destination address for which the timer
520 * expires, set RTO <- RTO * 2 ("back off the timer"). The
521 * maximum value discussed in rule C7 above (RTO.max) may be
522 * used to provide an upper bound to this doubling operation.
524 * Special Case: the first HB doesn't trigger exponential backoff.
525 * The first unacknowledged HB triggers it. We do this with a flag
526 * that indicates that we have an outstanding HB.
528 if (!is_hb
|| transport
->hb_sent
) {
529 transport
->rto
= min((transport
->rto
* 2), transport
->asoc
->rto_max
);
530 sctp_max_rto(asoc
, transport
);
534 /* Worker routine to handle INIT command failure. */
535 static void sctp_cmd_init_failed(sctp_cmd_seq_t
*commands
,
536 struct sctp_association
*asoc
,
539 struct sctp_ulpevent
*event
;
541 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_CANT_STR_ASSOC
,
542 (__u16
)error
, 0, 0, NULL
,
546 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
547 SCTP_ULPEVENT(event
));
549 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
550 SCTP_STATE(SCTP_STATE_CLOSED
));
552 /* SEND_FAILED sent later when cleaning up the association. */
553 asoc
->outqueue
.error
= error
;
554 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
557 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
558 static void sctp_cmd_assoc_failed(sctp_cmd_seq_t
*commands
,
559 struct sctp_association
*asoc
,
560 sctp_event_t event_type
,
561 sctp_subtype_t subtype
,
562 struct sctp_chunk
*chunk
,
565 struct sctp_ulpevent
*event
;
566 struct sctp_chunk
*abort
;
567 /* Cancel any partial delivery in progress. */
568 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
570 if (event_type
== SCTP_EVENT_T_CHUNK
&& subtype
.chunk
== SCTP_CID_ABORT
)
571 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
572 (__u16
)error
, 0, 0, chunk
,
575 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
576 (__u16
)error
, 0, 0, NULL
,
579 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
580 SCTP_ULPEVENT(event
));
582 if (asoc
->overall_error_count
>= asoc
->max_retrans
) {
583 abort
= sctp_make_violation_max_retrans(asoc
, chunk
);
585 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
589 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
590 SCTP_STATE(SCTP_STATE_CLOSED
));
592 /* SEND_FAILED sent later when cleaning up the association. */
593 asoc
->outqueue
.error
= error
;
594 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
597 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
598 * inside the cookie. In reality, this is only used for INIT-ACK processing
599 * since all other cases use "temporary" associations and can do all
600 * their work in statefuns directly.
602 static int sctp_cmd_process_init(sctp_cmd_seq_t
*commands
,
603 struct sctp_association
*asoc
,
604 struct sctp_chunk
*chunk
,
605 sctp_init_chunk_t
*peer_init
,
610 /* We only process the init as a sideeffect in a single
611 * case. This is when we process the INIT-ACK. If we
612 * fail during INIT processing (due to malloc problems),
613 * just return the error and stop processing the stack.
615 if (!sctp_process_init(asoc
, chunk
, sctp_source(chunk
), peer_init
, gfp
))
623 /* Helper function to break out starting up of heartbeat timers. */
624 static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t
*cmds
,
625 struct sctp_association
*asoc
)
627 struct sctp_transport
*t
;
629 /* Start a heartbeat timer for each transport on the association.
630 * hold a reference on the transport to make sure none of
631 * the needed data structures go away.
633 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
, transports
) {
635 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
636 sctp_transport_hold(t
);
640 static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t
*cmds
,
641 struct sctp_association
*asoc
)
643 struct sctp_transport
*t
;
645 /* Stop all heartbeat timers. */
647 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
649 if (del_timer(&t
->hb_timer
))
650 sctp_transport_put(t
);
654 /* Helper function to stop any pending T3-RTX timers */
655 static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t
*cmds
,
656 struct sctp_association
*asoc
)
658 struct sctp_transport
*t
;
660 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
662 if (del_timer(&t
->T3_rtx_timer
))
663 sctp_transport_put(t
);
668 /* Helper function to update the heartbeat timer. */
669 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t
*cmds
,
670 struct sctp_transport
*t
)
672 /* Update the heartbeat timer. */
673 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
674 sctp_transport_hold(t
);
677 /* Helper function to handle the reception of an HEARTBEAT ACK. */
678 static void sctp_cmd_transport_on(sctp_cmd_seq_t
*cmds
,
679 struct sctp_association
*asoc
,
680 struct sctp_transport
*t
,
681 struct sctp_chunk
*chunk
)
683 sctp_sender_hb_info_t
*hbinfo
;
684 int was_unconfirmed
= 0;
686 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
687 * HEARTBEAT should clear the error counter of the destination
688 * transport address to which the HEARTBEAT was sent.
693 * Although RFC4960 specifies that the overall error count must
694 * be cleared when a HEARTBEAT ACK is received, we make an
695 * exception while in SHUTDOWN PENDING. If the peer keeps its
696 * window shut forever, we may never be able to transmit our
697 * outstanding data and rely on the retransmission limit be reached
698 * to shutdown the association.
700 if (t
->asoc
->state
< SCTP_STATE_SHUTDOWN_PENDING
)
701 t
->asoc
->overall_error_count
= 0;
703 /* Clear the hb_sent flag to signal that we had a good
708 /* Mark the destination transport address as active if it is not so
711 if ((t
->state
== SCTP_INACTIVE
) || (t
->state
== SCTP_UNCONFIRMED
)) {
713 sctp_assoc_control_transport(asoc
, t
, SCTP_TRANSPORT_UP
,
714 SCTP_HEARTBEAT_SUCCESS
);
717 if (t
->state
== SCTP_PF
)
718 sctp_assoc_control_transport(asoc
, t
, SCTP_TRANSPORT_UP
,
719 SCTP_HEARTBEAT_SUCCESS
);
721 /* HB-ACK was received for a the proper HB. Consider this
727 /* The receiver of the HEARTBEAT ACK should also perform an
728 * RTT measurement for that destination transport address
729 * using the time value carried in the HEARTBEAT ACK chunk.
730 * If the transport's rto_pending variable has been cleared,
731 * it was most likely due to a retransmit. However, we want
732 * to re-enable it to properly update the rto.
734 if (t
->rto_pending
== 0)
737 hbinfo
= (sctp_sender_hb_info_t
*) chunk
->skb
->data
;
738 sctp_transport_update_rto(t
, (jiffies
- hbinfo
->sent_at
));
740 /* Update the heartbeat timer. */
741 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
742 sctp_transport_hold(t
);
744 if (was_unconfirmed
&& asoc
->peer
.transport_count
== 1)
745 sctp_transport_immediate_rtx(t
);
749 /* Helper function to process the process SACK command. */
750 static int sctp_cmd_process_sack(sctp_cmd_seq_t
*cmds
,
751 struct sctp_association
*asoc
,
752 struct sctp_chunk
*chunk
)
756 if (sctp_outq_sack(&asoc
->outqueue
, chunk
)) {
757 struct net
*net
= sock_net(asoc
->base
.sk
);
759 /* There are no more TSNs awaiting SACK. */
760 err
= sctp_do_sm(net
, SCTP_EVENT_T_OTHER
,
761 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN
),
762 asoc
->state
, asoc
->ep
, asoc
, NULL
,
769 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
770 * the transport for a shutdown chunk.
772 static void sctp_cmd_setup_t2(sctp_cmd_seq_t
*cmds
,
773 struct sctp_association
*asoc
,
774 struct sctp_chunk
*chunk
)
776 struct sctp_transport
*t
;
778 if (chunk
->transport
)
779 t
= chunk
->transport
;
781 t
= sctp_assoc_choose_alter_transport(asoc
,
782 asoc
->shutdown_last_sent_to
);
783 chunk
->transport
= t
;
785 asoc
->shutdown_last_sent_to
= t
;
786 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
] = t
->rto
;
789 /* Helper function to change the state of an association. */
790 static void sctp_cmd_new_state(sctp_cmd_seq_t
*cmds
,
791 struct sctp_association
*asoc
,
794 struct sock
*sk
= asoc
->base
.sk
;
798 pr_debug("%s: asoc:%p[%s]\n", __func__
, asoc
, sctp_state_tbl
[state
]);
800 if (sctp_style(sk
, TCP
)) {
801 /* Change the sk->sk_state of a TCP-style socket that has
802 * successfully completed a connect() call.
804 if (sctp_state(asoc
, ESTABLISHED
) && sctp_sstate(sk
, CLOSED
))
805 sk
->sk_state
= SCTP_SS_ESTABLISHED
;
807 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
808 if (sctp_state(asoc
, SHUTDOWN_RECEIVED
) &&
809 sctp_sstate(sk
, ESTABLISHED
))
810 sk
->sk_shutdown
|= RCV_SHUTDOWN
;
813 if (sctp_state(asoc
, COOKIE_WAIT
)) {
814 /* Reset init timeouts since they may have been
815 * increased due to timer expirations.
817 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] =
819 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] =
823 if (sctp_state(asoc
, ESTABLISHED
) ||
824 sctp_state(asoc
, CLOSED
) ||
825 sctp_state(asoc
, SHUTDOWN_RECEIVED
)) {
826 /* Wake up any processes waiting in the asoc's wait queue in
827 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
829 if (waitqueue_active(&asoc
->wait
))
830 wake_up_interruptible(&asoc
->wait
);
832 /* Wake up any processes waiting in the sk's sleep queue of
833 * a TCP-style or UDP-style peeled-off socket in
834 * sctp_wait_for_accept() or sctp_wait_for_packet().
835 * For a UDP-style socket, the waiters are woken up by the
838 if (!sctp_style(sk
, UDP
))
839 sk
->sk_state_change(sk
);
843 /* Helper function to delete an association. */
844 static void sctp_cmd_delete_tcb(sctp_cmd_seq_t
*cmds
,
845 struct sctp_association
*asoc
)
847 struct sock
*sk
= asoc
->base
.sk
;
849 /* If it is a non-temporary association belonging to a TCP-style
850 * listening socket that is not closed, do not free it so that accept()
851 * can pick it up later.
853 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
) &&
854 (!asoc
->temp
) && (sk
->sk_shutdown
!= SHUTDOWN_MASK
))
857 sctp_association_free(asoc
);
861 * ADDIP Section 4.1 ASCONF Chunk Procedures
862 * A4) Start a T-4 RTO timer, using the RTO value of the selected
863 * destination address (we use active path instead of primary path just
864 * because primary path may be inactive.
866 static void sctp_cmd_setup_t4(sctp_cmd_seq_t
*cmds
,
867 struct sctp_association
*asoc
,
868 struct sctp_chunk
*chunk
)
870 struct sctp_transport
*t
;
872 t
= sctp_assoc_choose_alter_transport(asoc
, chunk
->transport
);
873 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T4_RTO
] = t
->rto
;
874 chunk
->transport
= t
;
877 /* Process an incoming Operation Error Chunk. */
878 static void sctp_cmd_process_operr(sctp_cmd_seq_t
*cmds
,
879 struct sctp_association
*asoc
,
880 struct sctp_chunk
*chunk
)
882 struct sctp_errhdr
*err_hdr
;
883 struct sctp_ulpevent
*ev
;
885 while (chunk
->chunk_end
> chunk
->skb
->data
) {
886 err_hdr
= (struct sctp_errhdr
*)(chunk
->skb
->data
);
888 ev
= sctp_ulpevent_make_remote_error(asoc
, chunk
, 0,
893 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
895 switch (err_hdr
->cause
) {
896 case SCTP_ERROR_UNKNOWN_CHUNK
:
898 sctp_chunkhdr_t
*unk_chunk_hdr
;
900 unk_chunk_hdr
= (sctp_chunkhdr_t
*)err_hdr
->variable
;
901 switch (unk_chunk_hdr
->type
) {
902 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with
903 * an ERROR chunk reporting that it did not recognized
904 * the ASCONF chunk type, the sender of the ASCONF MUST
905 * NOT send any further ASCONF chunks and MUST stop its
908 case SCTP_CID_ASCONF
:
909 if (asoc
->peer
.asconf_capable
== 0)
912 asoc
->peer
.asconf_capable
= 0;
913 sctp_add_cmd_sf(cmds
, SCTP_CMD_TIMER_STOP
,
914 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO
));
927 /* Process variable FWDTSN chunk information. */
928 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq
*ulpq
,
929 struct sctp_chunk
*chunk
)
931 struct sctp_fwdtsn_skip
*skip
;
932 /* Walk through all the skipped SSNs */
933 sctp_walk_fwdtsn(skip
, chunk
) {
934 sctp_ulpq_skip(ulpq
, ntohs(skip
->stream
), ntohs(skip
->ssn
));
938 /* Helper function to remove the association non-primary peer
941 static void sctp_cmd_del_non_primary(struct sctp_association
*asoc
)
943 struct sctp_transport
*t
;
944 struct list_head
*pos
;
945 struct list_head
*temp
;
947 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
948 t
= list_entry(pos
, struct sctp_transport
, transports
);
949 if (!sctp_cmp_addr_exact(&t
->ipaddr
,
950 &asoc
->peer
.primary_addr
)) {
951 sctp_assoc_rm_peer(asoc
, t
);
956 /* Helper function to set sk_err on a 1-1 style socket. */
957 static void sctp_cmd_set_sk_err(struct sctp_association
*asoc
, int error
)
959 struct sock
*sk
= asoc
->base
.sk
;
961 if (!sctp_style(sk
, UDP
))
965 /* Helper function to generate an association change event */
966 static void sctp_cmd_assoc_change(sctp_cmd_seq_t
*commands
,
967 struct sctp_association
*asoc
,
970 struct sctp_ulpevent
*ev
;
972 ev
= sctp_ulpevent_make_assoc_change(asoc
, 0, state
, 0,
973 asoc
->c
.sinit_num_ostreams
,
974 asoc
->c
.sinit_max_instreams
,
977 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
980 /* Helper function to generate an adaptation indication event */
981 static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t
*commands
,
982 struct sctp_association
*asoc
)
984 struct sctp_ulpevent
*ev
;
986 ev
= sctp_ulpevent_make_adaptation_indication(asoc
, GFP_ATOMIC
);
989 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
993 static void sctp_cmd_t1_timer_update(struct sctp_association
*asoc
,
994 sctp_event_timeout_t timer
,
997 struct sctp_transport
*t
;
999 t
= asoc
->init_last_sent_to
;
1000 asoc
->init_err_counter
++;
1002 if (t
->init_sent_count
> (asoc
->init_cycle
+ 1)) {
1003 asoc
->timeouts
[timer
] *= 2;
1004 if (asoc
->timeouts
[timer
] > asoc
->max_init_timeo
) {
1005 asoc
->timeouts
[timer
] = asoc
->max_init_timeo
;
1009 pr_debug("%s: T1[%s] timeout adjustment init_err_counter:%d"
1010 " cycle:%d timeout:%ld\n", __func__
, name
,
1011 asoc
->init_err_counter
, asoc
->init_cycle
,
1012 asoc
->timeouts
[timer
]);
1017 /* Send the whole message, chunk by chunk, to the outqueue.
1018 * This way the whole message is queued up and bundling if
1019 * encouraged for small fragments.
1021 static int sctp_cmd_send_msg(struct sctp_association
*asoc
,
1022 struct sctp_datamsg
*msg
)
1024 struct sctp_chunk
*chunk
;
1027 list_for_each_entry(chunk
, &msg
->chunks
, frag_list
) {
1028 error
= sctp_outq_tail(&asoc
->outqueue
, chunk
);
1037 /* Sent the next ASCONF packet currently stored in the association.
1038 * This happens after the ASCONF_ACK was succeffully processed.
1040 static void sctp_cmd_send_asconf(struct sctp_association
*asoc
)
1042 struct net
*net
= sock_net(asoc
->base
.sk
);
1044 /* Send the next asconf chunk from the addip chunk
1047 if (!list_empty(&asoc
->addip_chunk_list
)) {
1048 struct list_head
*entry
= asoc
->addip_chunk_list
.next
;
1049 struct sctp_chunk
*asconf
= list_entry(entry
,
1050 struct sctp_chunk
, list
);
1051 list_del_init(entry
);
1053 /* Hold the chunk until an ASCONF_ACK is received. */
1054 sctp_chunk_hold(asconf
);
1055 if (sctp_primitive_ASCONF(net
, asoc
, asconf
))
1056 sctp_chunk_free(asconf
);
1058 asoc
->addip_last_asconf
= asconf
;
1063 /* These three macros allow us to pull the debugging code out of the
1064 * main flow of sctp_do_sm() to keep attention focused on the real
1065 * functionality there.
1067 #define debug_pre_sfn() \
1068 pr_debug("%s[pre-fn]: ep:%p, %s, %s, asoc:%p[%s], %s\n", __func__, \
1069 ep, sctp_evttype_tbl[event_type], (*debug_fn)(subtype), \
1070 asoc, sctp_state_tbl[state], state_fn->name)
1072 #define debug_post_sfn() \
1073 pr_debug("%s[post-fn]: asoc:%p, status:%s\n", __func__, asoc, \
1074 sctp_status_tbl[status])
1076 #define debug_post_sfx() \
1077 pr_debug("%s[post-sfx]: error:%d, asoc:%p[%s]\n", __func__, error, \
1078 asoc, sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
1079 sctp_assoc2id(asoc))) ? asoc->state : SCTP_STATE_CLOSED])
1082 * This is the master state machine processing function.
1084 * If you want to understand all of lksctp, this is a
1085 * good place to start.
1087 int sctp_do_sm(struct net
*net
, sctp_event_t event_type
, sctp_subtype_t subtype
,
1089 struct sctp_endpoint
*ep
,
1090 struct sctp_association
*asoc
,
1094 sctp_cmd_seq_t commands
;
1095 const sctp_sm_table_entry_t
*state_fn
;
1096 sctp_disposition_t status
;
1098 typedef const char *(printfn_t
)(sctp_subtype_t
);
1099 static printfn_t
*table
[] = {
1100 NULL
, sctp_cname
, sctp_tname
, sctp_oname
, sctp_pname
,
1102 printfn_t
*debug_fn
__attribute__ ((unused
)) = table
[event_type
];
1104 /* Look up the state function, run it, and then process the
1105 * side effects. These three steps are the heart of lksctp.
1107 state_fn
= sctp_sm_lookup_event(net
, event_type
, state
, subtype
);
1109 sctp_init_cmd_seq(&commands
);
1112 status
= state_fn
->fn(net
, ep
, asoc
, subtype
, event_arg
, &commands
);
1115 error
= sctp_side_effects(event_type
, subtype
, state
,
1116 ep
, &asoc
, event_arg
, status
,
1123 /*****************************************************************
1124 * This the master state function side effect processing function.
1125 *****************************************************************/
1126 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
1128 struct sctp_endpoint
*ep
,
1129 struct sctp_association
**asoc
,
1131 sctp_disposition_t status
,
1132 sctp_cmd_seq_t
*commands
,
1137 /* FIXME - Most of the dispositions left today would be categorized
1138 * as "exceptional" dispositions. For those dispositions, it
1139 * may not be proper to run through any of the commands at all.
1140 * For example, the command interpreter might be run only with
1141 * disposition SCTP_DISPOSITION_CONSUME.
1143 if (0 != (error
= sctp_cmd_interpreter(event_type
, subtype
, state
,
1150 case SCTP_DISPOSITION_DISCARD
:
1151 pr_debug("%s: ignored sctp protocol event - state:%d, "
1152 "event_type:%d, event_id:%d\n", __func__
, state
,
1153 event_type
, subtype
.chunk
);
1156 case SCTP_DISPOSITION_NOMEM
:
1157 /* We ran out of memory, so we need to discard this
1160 /* BUG--we should now recover some memory, probably by
1166 case SCTP_DISPOSITION_DELETE_TCB
:
1167 case SCTP_DISPOSITION_ABORT
:
1168 /* This should now be a command. */
1172 case SCTP_DISPOSITION_CONSUME
:
1174 * We should no longer have much work to do here as the
1175 * real work has been done as explicit commands above.
1179 case SCTP_DISPOSITION_VIOLATION
:
1180 net_err_ratelimited("protocol violation state %d chunkid %d\n",
1181 state
, subtype
.chunk
);
1184 case SCTP_DISPOSITION_NOT_IMPL
:
1185 pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n",
1186 state
, event_type
, subtype
.chunk
);
1189 case SCTP_DISPOSITION_BUG
:
1190 pr_err("bug in state %d, event_type %d, event_id %d\n",
1191 state
, event_type
, subtype
.chunk
);
1196 pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n",
1197 status
, state
, event_type
, subtype
.chunk
);
1206 /********************************************************************
1207 * 2nd Level Abstractions
1208 ********************************************************************/
1210 /* This is the side-effect interpreter. */
1211 static int sctp_cmd_interpreter(sctp_event_t event_type
,
1212 sctp_subtype_t subtype
,
1214 struct sctp_endpoint
*ep
,
1215 struct sctp_association
*asoc
,
1217 sctp_disposition_t status
,
1218 sctp_cmd_seq_t
*commands
,
1224 struct sctp_chunk
*new_obj
;
1225 struct sctp_chunk
*chunk
= NULL
;
1226 struct sctp_packet
*packet
;
1227 struct timer_list
*timer
;
1228 unsigned long timeout
;
1229 struct sctp_transport
*t
;
1230 struct sctp_sackhdr sackh
;
1233 if (SCTP_EVENT_T_TIMEOUT
!= event_type
)
1236 /* Note: This whole file is a huge candidate for rework.
1237 * For example, each command could either have its own handler, so
1238 * the loop would look like:
1240 * cmd->handle(x, y, z)
1243 while (NULL
!= (cmd
= sctp_next_cmd(commands
))) {
1244 switch (cmd
->verb
) {
1249 case SCTP_CMD_NEW_ASOC
:
1250 /* Register a new association. */
1252 sctp_outq_uncork(&asoc
->outqueue
);
1256 /* Register with the endpoint. */
1257 asoc
= cmd
->obj
.asoc
;
1258 BUG_ON(asoc
->peer
.primary_path
== NULL
);
1259 sctp_endpoint_add_asoc(ep
, asoc
);
1262 case SCTP_CMD_UPDATE_ASSOC
:
1263 sctp_assoc_update(asoc
, cmd
->obj
.asoc
);
1266 case SCTP_CMD_PURGE_OUTQUEUE
:
1267 sctp_outq_teardown(&asoc
->outqueue
);
1270 case SCTP_CMD_DELETE_TCB
:
1272 sctp_outq_uncork(&asoc
->outqueue
);
1275 /* Delete the current association. */
1276 sctp_cmd_delete_tcb(commands
, asoc
);
1280 case SCTP_CMD_NEW_STATE
:
1281 /* Enter a new state. */
1282 sctp_cmd_new_state(commands
, asoc
, cmd
->obj
.state
);
1285 case SCTP_CMD_REPORT_TSN
:
1286 /* Record the arrival of a TSN. */
1287 error
= sctp_tsnmap_mark(&asoc
->peer
.tsn_map
,
1288 cmd
->obj
.u32
, NULL
);
1291 case SCTP_CMD_REPORT_FWDTSN
:
1292 /* Move the Cumulattive TSN Ack ahead. */
1293 sctp_tsnmap_skip(&asoc
->peer
.tsn_map
, cmd
->obj
.u32
);
1295 /* purge the fragmentation queue */
1296 sctp_ulpq_reasm_flushtsn(&asoc
->ulpq
, cmd
->obj
.u32
);
1298 /* Abort any in progress partial delivery. */
1299 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
1302 case SCTP_CMD_PROCESS_FWDTSN
:
1303 sctp_cmd_process_fwdtsn(&asoc
->ulpq
, cmd
->obj
.chunk
);
1306 case SCTP_CMD_GEN_SACK
:
1307 /* Generate a Selective ACK.
1308 * The argument tells us whether to just count
1309 * the packet and MAYBE generate a SACK, or
1312 force
= cmd
->obj
.i32
;
1313 error
= sctp_gen_sack(asoc
, force
, commands
);
1316 case SCTP_CMD_PROCESS_SACK
:
1317 /* Process an inbound SACK. */
1318 error
= sctp_cmd_process_sack(commands
, asoc
,
1322 case SCTP_CMD_GEN_INIT_ACK
:
1323 /* Generate an INIT ACK chunk. */
1324 new_obj
= sctp_make_init_ack(asoc
, chunk
, GFP_ATOMIC
,
1329 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1330 SCTP_CHUNK(new_obj
));
1333 case SCTP_CMD_PEER_INIT
:
1334 /* Process a unified INIT from the peer.
1335 * Note: Only used during INIT-ACK processing. If
1336 * there is an error just return to the outter
1337 * layer which will bail.
1339 error
= sctp_cmd_process_init(commands
, asoc
, chunk
,
1340 cmd
->obj
.init
, gfp
);
1343 case SCTP_CMD_GEN_COOKIE_ECHO
:
1344 /* Generate a COOKIE ECHO chunk. */
1345 new_obj
= sctp_make_cookie_echo(asoc
, chunk
);
1348 sctp_chunk_free(cmd
->obj
.chunk
);
1351 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1352 SCTP_CHUNK(new_obj
));
1354 /* If there is an ERROR chunk to be sent along with
1355 * the COOKIE_ECHO, send it, too.
1358 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1359 SCTP_CHUNK(cmd
->obj
.chunk
));
1361 if (new_obj
->transport
) {
1362 new_obj
->transport
->init_sent_count
++;
1363 asoc
->init_last_sent_to
= new_obj
->transport
;
1366 /* FIXME - Eventually come up with a cleaner way to
1367 * enabling COOKIE-ECHO + DATA bundling during
1368 * multihoming stale cookie scenarios, the following
1369 * command plays with asoc->peer.retran_path to
1370 * avoid the problem of sending the COOKIE-ECHO and
1371 * DATA in different paths, which could result
1372 * in the association being ABORTed if the DATA chunk
1373 * is processed first by the server. Checking the
1374 * init error counter simply causes this command
1375 * to be executed only during failed attempts of
1376 * association establishment.
1378 if ((asoc
->peer
.retran_path
!=
1379 asoc
->peer
.primary_path
) &&
1380 (asoc
->init_err_counter
> 0)) {
1381 sctp_add_cmd_sf(commands
,
1382 SCTP_CMD_FORCE_PRIM_RETRAN
,
1388 case SCTP_CMD_GEN_SHUTDOWN
:
1389 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1390 * Reset error counts.
1392 asoc
->overall_error_count
= 0;
1394 /* Generate a SHUTDOWN chunk. */
1395 new_obj
= sctp_make_shutdown(asoc
, chunk
);
1398 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1399 SCTP_CHUNK(new_obj
));
1402 case SCTP_CMD_CHUNK_ULP
:
1403 /* Send a chunk to the sockets layer. */
1404 pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n",
1405 __func__
, cmd
->obj
.chunk
, &asoc
->ulpq
);
1407 sctp_ulpq_tail_data(&asoc
->ulpq
, cmd
->obj
.chunk
,
1411 case SCTP_CMD_EVENT_ULP
:
1412 /* Send a notification to the sockets layer. */
1413 pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n",
1414 __func__
, cmd
->obj
.ulpevent
, &asoc
->ulpq
);
1416 sctp_ulpq_tail_event(&asoc
->ulpq
, cmd
->obj
.ulpevent
);
1419 case SCTP_CMD_REPLY
:
1420 /* If an caller has not already corked, do cork. */
1421 if (!asoc
->outqueue
.cork
) {
1422 sctp_outq_cork(&asoc
->outqueue
);
1425 /* Send a chunk to our peer. */
1426 error
= sctp_outq_tail(&asoc
->outqueue
, cmd
->obj
.chunk
);
1429 case SCTP_CMD_SEND_PKT
:
1430 /* Send a full packet to our peer. */
1431 packet
= cmd
->obj
.packet
;
1432 sctp_packet_transmit(packet
);
1433 sctp_ootb_pkt_free(packet
);
1436 case SCTP_CMD_T1_RETRAN
:
1437 /* Mark a transport for retransmission. */
1438 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1442 case SCTP_CMD_RETRAN
:
1443 /* Mark a transport for retransmission. */
1444 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1448 case SCTP_CMD_ECN_CE
:
1449 /* Do delayed CE processing. */
1450 sctp_do_ecn_ce_work(asoc
, cmd
->obj
.u32
);
1453 case SCTP_CMD_ECN_ECNE
:
1454 /* Do delayed ECNE processing. */
1455 new_obj
= sctp_do_ecn_ecne_work(asoc
, cmd
->obj
.u32
,
1458 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1459 SCTP_CHUNK(new_obj
));
1462 case SCTP_CMD_ECN_CWR
:
1463 /* Do delayed CWR processing. */
1464 sctp_do_ecn_cwr_work(asoc
, cmd
->obj
.u32
);
1467 case SCTP_CMD_SETUP_T2
:
1468 sctp_cmd_setup_t2(commands
, asoc
, cmd
->obj
.chunk
);
1471 case SCTP_CMD_TIMER_START_ONCE
:
1472 timer
= &asoc
->timers
[cmd
->obj
.to
];
1474 if (timer_pending(timer
))
1478 case SCTP_CMD_TIMER_START
:
1479 timer
= &asoc
->timers
[cmd
->obj
.to
];
1480 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1483 timer
->expires
= jiffies
+ timeout
;
1484 sctp_association_hold(asoc
);
1488 case SCTP_CMD_TIMER_RESTART
:
1489 timer
= &asoc
->timers
[cmd
->obj
.to
];
1490 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1491 if (!mod_timer(timer
, jiffies
+ timeout
))
1492 sctp_association_hold(asoc
);
1495 case SCTP_CMD_TIMER_STOP
:
1496 timer
= &asoc
->timers
[cmd
->obj
.to
];
1497 if (del_timer(timer
))
1498 sctp_association_put(asoc
);
1501 case SCTP_CMD_INIT_CHOOSE_TRANSPORT
:
1502 chunk
= cmd
->obj
.chunk
;
1503 t
= sctp_assoc_choose_alter_transport(asoc
,
1504 asoc
->init_last_sent_to
);
1505 asoc
->init_last_sent_to
= t
;
1506 chunk
->transport
= t
;
1507 t
->init_sent_count
++;
1508 /* Set the new transport as primary */
1509 sctp_assoc_set_primary(asoc
, t
);
1512 case SCTP_CMD_INIT_RESTART
:
1513 /* Do the needed accounting and updates
1514 * associated with restarting an initialization
1515 * timer. Only multiply the timeout by two if
1516 * all transports have been tried at the current
1519 sctp_cmd_t1_timer_update(asoc
,
1520 SCTP_EVENT_TIMEOUT_T1_INIT
,
1523 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
1524 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT
));
1527 case SCTP_CMD_COOKIEECHO_RESTART
:
1528 /* Do the needed accounting and updates
1529 * associated with restarting an initialization
1530 * timer. Only multiply the timeout by two if
1531 * all transports have been tried at the current
1534 sctp_cmd_t1_timer_update(asoc
,
1535 SCTP_EVENT_TIMEOUT_T1_COOKIE
,
1538 /* If we've sent any data bundled with
1539 * COOKIE-ECHO we need to resend.
1541 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
1543 sctp_retransmit_mark(&asoc
->outqueue
, t
,
1547 sctp_add_cmd_sf(commands
,
1548 SCTP_CMD_TIMER_RESTART
,
1549 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE
));
1552 case SCTP_CMD_INIT_FAILED
:
1553 sctp_cmd_init_failed(commands
, asoc
, cmd
->obj
.err
);
1556 case SCTP_CMD_ASSOC_FAILED
:
1557 sctp_cmd_assoc_failed(commands
, asoc
, event_type
,
1558 subtype
, chunk
, cmd
->obj
.err
);
1561 case SCTP_CMD_INIT_COUNTER_INC
:
1562 asoc
->init_err_counter
++;
1565 case SCTP_CMD_INIT_COUNTER_RESET
:
1566 asoc
->init_err_counter
= 0;
1567 asoc
->init_cycle
= 0;
1568 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
1570 t
->init_sent_count
= 0;
1574 case SCTP_CMD_REPORT_DUP
:
1575 sctp_tsnmap_mark_dup(&asoc
->peer
.tsn_map
,
1579 case SCTP_CMD_REPORT_BAD_TAG
:
1580 pr_debug("%s: vtag mismatch!\n", __func__
);
1583 case SCTP_CMD_STRIKE
:
1584 /* Mark one strike against a transport. */
1585 sctp_do_8_2_transport_strike(commands
, asoc
,
1586 cmd
->obj
.transport
, 0);
1589 case SCTP_CMD_TRANSPORT_IDLE
:
1590 t
= cmd
->obj
.transport
;
1591 sctp_transport_lower_cwnd(t
, SCTP_LOWER_CWND_INACTIVE
);
1594 case SCTP_CMD_TRANSPORT_HB_SENT
:
1595 t
= cmd
->obj
.transport
;
1596 sctp_do_8_2_transport_strike(commands
, asoc
,
1601 case SCTP_CMD_TRANSPORT_ON
:
1602 t
= cmd
->obj
.transport
;
1603 sctp_cmd_transport_on(commands
, asoc
, t
, chunk
);
1606 case SCTP_CMD_HB_TIMERS_START
:
1607 sctp_cmd_hb_timers_start(commands
, asoc
);
1610 case SCTP_CMD_HB_TIMER_UPDATE
:
1611 t
= cmd
->obj
.transport
;
1612 sctp_cmd_hb_timer_update(commands
, t
);
1615 case SCTP_CMD_HB_TIMERS_STOP
:
1616 sctp_cmd_hb_timers_stop(commands
, asoc
);
1619 case SCTP_CMD_REPORT_ERROR
:
1620 error
= cmd
->obj
.error
;
1623 case SCTP_CMD_PROCESS_CTSN
:
1624 /* Dummy up a SACK for processing. */
1625 sackh
.cum_tsn_ack
= cmd
->obj
.be32
;
1626 sackh
.a_rwnd
= asoc
->peer
.rwnd
+
1627 asoc
->outqueue
.outstanding_bytes
;
1628 sackh
.num_gap_ack_blocks
= 0;
1629 sackh
.num_dup_tsns
= 0;
1630 chunk
->subh
.sack_hdr
= &sackh
;
1631 sctp_add_cmd_sf(commands
, SCTP_CMD_PROCESS_SACK
,
1635 case SCTP_CMD_DISCARD_PACKET
:
1636 /* We need to discard the whole packet.
1637 * Uncork the queue since there might be
1640 chunk
->pdiscard
= 1;
1642 sctp_outq_uncork(&asoc
->outqueue
);
1647 case SCTP_CMD_RTO_PENDING
:
1648 t
= cmd
->obj
.transport
;
1652 case SCTP_CMD_PART_DELIVER
:
1653 sctp_ulpq_partial_delivery(&asoc
->ulpq
, GFP_ATOMIC
);
1656 case SCTP_CMD_RENEGE
:
1657 sctp_ulpq_renege(&asoc
->ulpq
, cmd
->obj
.chunk
,
1661 case SCTP_CMD_SETUP_T4
:
1662 sctp_cmd_setup_t4(commands
, asoc
, cmd
->obj
.chunk
);
1665 case SCTP_CMD_PROCESS_OPERR
:
1666 sctp_cmd_process_operr(commands
, asoc
, chunk
);
1668 case SCTP_CMD_CLEAR_INIT_TAG
:
1669 asoc
->peer
.i
.init_tag
= 0;
1671 case SCTP_CMD_DEL_NON_PRIMARY
:
1672 sctp_cmd_del_non_primary(asoc
);
1674 case SCTP_CMD_T3_RTX_TIMERS_STOP
:
1675 sctp_cmd_t3_rtx_timers_stop(commands
, asoc
);
1677 case SCTP_CMD_FORCE_PRIM_RETRAN
:
1678 t
= asoc
->peer
.retran_path
;
1679 asoc
->peer
.retran_path
= asoc
->peer
.primary_path
;
1680 error
= sctp_outq_uncork(&asoc
->outqueue
);
1682 asoc
->peer
.retran_path
= t
;
1684 case SCTP_CMD_SET_SK_ERR
:
1685 sctp_cmd_set_sk_err(asoc
, cmd
->obj
.error
);
1687 case SCTP_CMD_ASSOC_CHANGE
:
1688 sctp_cmd_assoc_change(commands
, asoc
,
1691 case SCTP_CMD_ADAPTATION_IND
:
1692 sctp_cmd_adaptation_ind(commands
, asoc
);
1695 case SCTP_CMD_ASSOC_SHKEY
:
1696 error
= sctp_auth_asoc_init_active_key(asoc
,
1699 case SCTP_CMD_UPDATE_INITTAG
:
1700 asoc
->peer
.i
.init_tag
= cmd
->obj
.u32
;
1702 case SCTP_CMD_SEND_MSG
:
1703 if (!asoc
->outqueue
.cork
) {
1704 sctp_outq_cork(&asoc
->outqueue
);
1707 error
= sctp_cmd_send_msg(asoc
, cmd
->obj
.msg
);
1709 case SCTP_CMD_SEND_NEXT_ASCONF
:
1710 sctp_cmd_send_asconf(asoc
);
1712 case SCTP_CMD_PURGE_ASCONF_QUEUE
:
1713 sctp_asconf_queue_teardown(asoc
);
1716 case SCTP_CMD_SET_ASOC
:
1717 asoc
= cmd
->obj
.asoc
;
1721 pr_warn("Impossible command: %u\n",
1731 /* If this is in response to a received chunk, wait until
1732 * we are done with the packet to open the queue so that we don't
1733 * send multiple packets in response to a single request.
1735 if (asoc
&& SCTP_EVENT_T_CHUNK
== event_type
&& chunk
) {
1736 if (chunk
->end_of_packet
|| chunk
->singleton
)
1737 error
= sctp_outq_uncork(&asoc
->outqueue
);
1738 } else if (local_cork
)
1739 error
= sctp_outq_uncork(&asoc
->outqueue
);