1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
6 * This file is part of the SCTP kernel implementation
8 * These functions work with the state functions in sctp_sm_statefuns.c
9 * to implement that state operations. These functions implement the
10 * steps which require modifying existing data structures.
12 * This SCTP implementation is free software;
13 * you can redistribute it and/or modify it under the terms of
14 * the GNU General Public License as published by
15 * the Free Software Foundation; either version 2, or (at your option)
18 * This SCTP implementation is distributed in the hope that it
19 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
20 * ************************
21 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
22 * See the GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with GNU CC; see the file COPYING. If not, write to
26 * the Free Software Foundation, 59 Temple Place - Suite 330,
27 * Boston, MA 02111-1307, USA.
29 * Please send any bug reports or fixes you make to the
31 * lksctp developers <lksctp-developers@lists.sourceforge.net>
33 * Or submit a bug report through the following website:
34 * http://www.sf.net/projects/lksctp
36 * Written or modified by:
37 * La Monte H.P. Yarroll <piggy@acm.org>
38 * Karl Knutson <karl@athena.chicago.il.us>
39 * Jon Grimm <jgrimm@austin.ibm.com>
40 * Hui Huang <hui.huang@nokia.com>
41 * Dajiang Zhang <dajiang.zhang@nokia.com>
42 * Daisy Chang <daisyc@us.ibm.com>
43 * Sridhar Samudrala <sri@us.ibm.com>
44 * Ardelle Fan <ardelle.fan@intel.com>
46 * Any bugs reported given to us we will try to fix... any fixes shared will
47 * be incorporated into the next SCTP release.
50 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
52 #include <linux/skbuff.h>
53 #include <linux/types.h>
54 #include <linux/socket.h>
56 #include <linux/gfp.h>
58 #include <net/sctp/sctp.h>
59 #include <net/sctp/sm.h>
61 static int sctp_cmd_interpreter(sctp_event_t event_type
,
62 sctp_subtype_t subtype
,
64 struct sctp_endpoint
*ep
,
65 struct sctp_association
*asoc
,
67 sctp_disposition_t status
,
68 sctp_cmd_seq_t
*commands
,
70 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
72 struct sctp_endpoint
*ep
,
73 struct sctp_association
*asoc
,
75 sctp_disposition_t status
,
76 sctp_cmd_seq_t
*commands
,
79 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t
*cmds
,
80 struct sctp_transport
*t
);
81 /********************************************************************
83 ********************************************************************/
85 /* A helper function for delayed processing of INET ECN CE bit. */
86 static void sctp_do_ecn_ce_work(struct sctp_association
*asoc
,
89 /* Save the TSN away for comparison when we receive CWR */
91 asoc
->last_ecne_tsn
= lowest_tsn
;
95 /* Helper function for delayed processing of SCTP ECNE chunk. */
96 /* RFC 2960 Appendix A
98 * RFC 2481 details a specific bit for a sender to send in
99 * the header of its next outbound TCP segment to indicate to
100 * its peer that it has reduced its congestion window. This
101 * is termed the CWR bit. For SCTP the same indication is made
102 * by including the CWR chunk. This chunk contains one data
103 * element, i.e. the TSN number that was sent in the ECNE chunk.
104 * This element represents the lowest TSN number in the datagram
105 * that was originally marked with the CE bit.
107 static struct sctp_chunk
*sctp_do_ecn_ecne_work(struct sctp_association
*asoc
,
109 struct sctp_chunk
*chunk
)
111 struct sctp_chunk
*repl
;
113 /* Our previously transmitted packet ran into some congestion
114 * so we should take action by reducing cwnd and ssthresh
115 * and then ACK our peer that we we've done so by
119 /* First, try to determine if we want to actually lower
120 * our cwnd variables. Only lower them if the ECNE looks more
121 * recent than the last response.
123 if (TSN_lt(asoc
->last_cwr_tsn
, lowest_tsn
)) {
124 struct sctp_transport
*transport
;
126 /* Find which transport's congestion variables
127 * need to be adjusted.
129 transport
= sctp_assoc_lookup_tsn(asoc
, lowest_tsn
);
131 /* Update the congestion variables. */
133 sctp_transport_lower_cwnd(transport
,
134 SCTP_LOWER_CWND_ECNE
);
135 asoc
->last_cwr_tsn
= lowest_tsn
;
138 /* Always try to quiet the other end. In case of lost CWR,
139 * resend last_cwr_tsn.
141 repl
= sctp_make_cwr(asoc
, asoc
->last_cwr_tsn
, chunk
);
143 /* If we run out of memory, it will look like a lost CWR. We'll
144 * get back in sync eventually.
149 /* Helper function to do delayed processing of ECN CWR chunk. */
150 static void sctp_do_ecn_cwr_work(struct sctp_association
*asoc
,
153 /* Turn off ECNE getting auto-prepended to every outgoing
159 /* Generate SACK if necessary. We call this at the end of a packet. */
160 static int sctp_gen_sack(struct sctp_association
*asoc
, int force
,
161 sctp_cmd_seq_t
*commands
)
163 __u32 ctsn
, max_tsn_seen
;
164 struct sctp_chunk
*sack
;
165 struct sctp_transport
*trans
= asoc
->peer
.last_data_from
;
169 (!trans
&& (asoc
->param_flags
& SPP_SACKDELAY_DISABLE
)) ||
170 (trans
&& (trans
->param_flags
& SPP_SACKDELAY_DISABLE
)))
171 asoc
->peer
.sack_needed
= 1;
173 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
174 max_tsn_seen
= sctp_tsnmap_get_max_tsn_seen(&asoc
->peer
.tsn_map
);
176 /* From 12.2 Parameters necessary per association (i.e. the TCB):
178 * Ack State : This flag indicates if the next received packet
179 * : is to be responded to with a SACK. ...
180 * : When DATA chunks are out of order, SACK's
181 * : are not delayed (see Section 6).
183 * [This is actually not mentioned in Section 6, but we
184 * implement it here anyway. --piggy]
186 if (max_tsn_seen
!= ctsn
)
187 asoc
->peer
.sack_needed
= 1;
189 /* From 6.2 Acknowledgement on Reception of DATA Chunks:
191 * Section 4.2 of [RFC2581] SHOULD be followed. Specifically,
192 * an acknowledgement SHOULD be generated for at least every
193 * second packet (not every second DATA chunk) received, and
194 * SHOULD be generated within 200 ms of the arrival of any
195 * unacknowledged DATA chunk. ...
197 if (!asoc
->peer
.sack_needed
) {
198 asoc
->peer
.sack_cnt
++;
200 /* Set the SACK delay timeout based on the
201 * SACK delay for the last transport
202 * data was received from, or the default
203 * for the association.
206 /* We will need a SACK for the next packet. */
207 if (asoc
->peer
.sack_cnt
>= trans
->sackfreq
- 1)
208 asoc
->peer
.sack_needed
= 1;
210 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
213 /* We will need a SACK for the next packet. */
214 if (asoc
->peer
.sack_cnt
>= asoc
->sackfreq
- 1)
215 asoc
->peer
.sack_needed
= 1;
217 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
221 /* Restart the SACK timer. */
222 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
223 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
225 asoc
->a_rwnd
= asoc
->rwnd
;
226 sack
= sctp_make_sack(asoc
);
230 asoc
->peer
.sack_needed
= 0;
231 asoc
->peer
.sack_cnt
= 0;
233 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
, SCTP_CHUNK(sack
));
235 /* Stop the SACK timer. */
236 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_STOP
,
237 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
246 /* When the T3-RTX timer expires, it calls this function to create the
247 * relevant state machine event.
249 void sctp_generate_t3_rtx_event(unsigned long peer
)
252 struct sctp_transport
*transport
= (struct sctp_transport
*) peer
;
253 struct sctp_association
*asoc
= transport
->asoc
;
254 struct net
*net
= sock_net(asoc
->base
.sk
);
256 /* Check whether a task is in the sock. */
258 sctp_bh_lock_sock(asoc
->base
.sk
);
259 if (sock_owned_by_user(asoc
->base
.sk
)) {
260 pr_debug("%s: sock is busy\n", __func__
);
262 /* Try again later. */
263 if (!mod_timer(&transport
->T3_rtx_timer
, jiffies
+ (HZ
/20)))
264 sctp_transport_hold(transport
);
268 /* Is this transport really dead and just waiting around for
269 * the timer to let go of the reference?
274 /* Run through the state machine. */
275 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
276 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX
),
279 transport
, GFP_ATOMIC
);
282 asoc
->base
.sk
->sk_err
= -error
;
285 sctp_bh_unlock_sock(asoc
->base
.sk
);
286 sctp_transport_put(transport
);
289 /* This is a sa interface for producing timeout events. It works
290 * for timeouts which use the association as their parameter.
292 static void sctp_generate_timeout_event(struct sctp_association
*asoc
,
293 sctp_event_timeout_t timeout_type
)
295 struct net
*net
= sock_net(asoc
->base
.sk
);
298 sctp_bh_lock_sock(asoc
->base
.sk
);
299 if (sock_owned_by_user(asoc
->base
.sk
)) {
300 pr_debug("%s: sock is busy: timer %d\n", __func__
,
303 /* Try again later. */
304 if (!mod_timer(&asoc
->timers
[timeout_type
], jiffies
+ (HZ
/20)))
305 sctp_association_hold(asoc
);
309 /* Is this association really dead and just waiting around for
310 * the timer to let go of the reference?
315 /* Run through the state machine. */
316 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
317 SCTP_ST_TIMEOUT(timeout_type
),
318 asoc
->state
, asoc
->ep
, asoc
,
319 (void *)timeout_type
, GFP_ATOMIC
);
322 asoc
->base
.sk
->sk_err
= -error
;
325 sctp_bh_unlock_sock(asoc
->base
.sk
);
326 sctp_association_put(asoc
);
329 static void sctp_generate_t1_cookie_event(unsigned long data
)
331 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
332 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_COOKIE
);
335 static void sctp_generate_t1_init_event(unsigned long data
)
337 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
338 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_INIT
);
341 static void sctp_generate_t2_shutdown_event(unsigned long data
)
343 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
344 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
);
347 static void sctp_generate_t4_rto_event(unsigned long data
)
349 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
350 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T4_RTO
);
353 static void sctp_generate_t5_shutdown_guard_event(unsigned long data
)
355 struct sctp_association
*asoc
= (struct sctp_association
*)data
;
356 sctp_generate_timeout_event(asoc
,
357 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD
);
359 } /* sctp_generate_t5_shutdown_guard_event() */
361 static void sctp_generate_autoclose_event(unsigned long data
)
363 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
364 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_AUTOCLOSE
);
367 /* Generate a heart beat event. If the sock is busy, reschedule. Make
368 * sure that the transport is still valid.
370 void sctp_generate_heartbeat_event(unsigned long data
)
373 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
374 struct sctp_association
*asoc
= transport
->asoc
;
375 struct net
*net
= sock_net(asoc
->base
.sk
);
377 sctp_bh_lock_sock(asoc
->base
.sk
);
378 if (sock_owned_by_user(asoc
->base
.sk
)) {
379 pr_debug("%s: sock is busy\n", __func__
);
381 /* Try again later. */
382 if (!mod_timer(&transport
->hb_timer
, jiffies
+ (HZ
/20)))
383 sctp_transport_hold(transport
);
387 /* Is this structure just waiting around for us to actually
393 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
394 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT
),
395 asoc
->state
, asoc
->ep
, asoc
,
396 transport
, GFP_ATOMIC
);
399 asoc
->base
.sk
->sk_err
= -error
;
402 sctp_bh_unlock_sock(asoc
->base
.sk
);
403 sctp_transport_put(transport
);
406 /* Handle the timeout of the ICMP protocol unreachable timer. Trigger
407 * the correct state machine transition that will close the association.
409 void sctp_generate_proto_unreach_event(unsigned long data
)
411 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
412 struct sctp_association
*asoc
= transport
->asoc
;
413 struct net
*net
= sock_net(asoc
->base
.sk
);
415 sctp_bh_lock_sock(asoc
->base
.sk
);
416 if (sock_owned_by_user(asoc
->base
.sk
)) {
417 pr_debug("%s: sock is busy\n", __func__
);
419 /* Try again later. */
420 if (!mod_timer(&transport
->proto_unreach_timer
,
422 sctp_association_hold(asoc
);
426 /* Is this structure just waiting around for us to actually
432 sctp_do_sm(net
, SCTP_EVENT_T_OTHER
,
433 SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH
),
434 asoc
->state
, asoc
->ep
, asoc
, transport
, GFP_ATOMIC
);
437 sctp_bh_unlock_sock(asoc
->base
.sk
);
438 sctp_association_put(asoc
);
442 /* Inject a SACK Timeout event into the state machine. */
443 static void sctp_generate_sack_event(unsigned long data
)
445 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
446 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_SACK
);
449 sctp_timer_event_t
*sctp_timer_events
[SCTP_NUM_TIMEOUT_TYPES
] = {
451 sctp_generate_t1_cookie_event
,
452 sctp_generate_t1_init_event
,
453 sctp_generate_t2_shutdown_event
,
455 sctp_generate_t4_rto_event
,
456 sctp_generate_t5_shutdown_guard_event
,
458 sctp_generate_sack_event
,
459 sctp_generate_autoclose_event
,
463 /* RFC 2960 8.2 Path Failure Detection
465 * When its peer endpoint is multi-homed, an endpoint should keep a
466 * error counter for each of the destination transport addresses of the
469 * Each time the T3-rtx timer expires on any address, or when a
470 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
471 * the error counter of that destination address will be incremented.
472 * When the value in the error counter exceeds the protocol parameter
473 * 'Path.Max.Retrans' of that destination address, the endpoint should
474 * mark the destination transport address as inactive, and a
475 * notification SHOULD be sent to the upper layer.
478 static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t
*commands
,
479 struct sctp_association
*asoc
,
480 struct sctp_transport
*transport
,
483 /* The check for association's overall error counter exceeding the
484 * threshold is done in the state function.
486 /* We are here due to a timer expiration. If the timer was
487 * not a HEARTBEAT, then normal error tracking is done.
488 * If the timer was a heartbeat, we only increment error counts
489 * when we already have an outstanding HEARTBEAT that has not
491 * Additionally, some tranport states inhibit error increments.
494 asoc
->overall_error_count
++;
495 if (transport
->state
!= SCTP_INACTIVE
)
496 transport
->error_count
++;
497 } else if (transport
->hb_sent
) {
498 if (transport
->state
!= SCTP_UNCONFIRMED
)
499 asoc
->overall_error_count
++;
500 if (transport
->state
!= SCTP_INACTIVE
)
501 transport
->error_count
++;
504 /* If the transport error count is greater than the pf_retrans
505 * threshold, and less than pathmaxrtx, then mark this transport
506 * as Partially Failed, ee SCTP Quick Failover Draft, secon 5.1,
509 if ((transport
->state
!= SCTP_PF
) &&
510 (asoc
->pf_retrans
< transport
->pathmaxrxt
) &&
511 (transport
->error_count
> asoc
->pf_retrans
)) {
513 sctp_assoc_control_transport(asoc
, transport
,
517 /* Update the hb timer to resend a heartbeat every rto */
518 sctp_cmd_hb_timer_update(commands
, transport
);
521 if (transport
->state
!= SCTP_INACTIVE
&&
522 (transport
->error_count
> transport
->pathmaxrxt
)) {
523 pr_debug("%s: association:%p transport addr:%pISpc failed\n",
524 __func__
, asoc
, &transport
->ipaddr
.sa
);
526 sctp_assoc_control_transport(asoc
, transport
,
528 SCTP_FAILED_THRESHOLD
);
531 /* E2) For the destination address for which the timer
532 * expires, set RTO <- RTO * 2 ("back off the timer"). The
533 * maximum value discussed in rule C7 above (RTO.max) may be
534 * used to provide an upper bound to this doubling operation.
536 * Special Case: the first HB doesn't trigger exponential backoff.
537 * The first unacknowledged HB triggers it. We do this with a flag
538 * that indicates that we have an outstanding HB.
540 if (!is_hb
|| transport
->hb_sent
) {
541 transport
->rto
= min((transport
->rto
* 2), transport
->asoc
->rto_max
);
542 sctp_max_rto(asoc
, transport
);
546 /* Worker routine to handle INIT command failure. */
547 static void sctp_cmd_init_failed(sctp_cmd_seq_t
*commands
,
548 struct sctp_association
*asoc
,
551 struct sctp_ulpevent
*event
;
553 event
= sctp_ulpevent_make_assoc_change(asoc
,0, SCTP_CANT_STR_ASSOC
,
554 (__u16
)error
, 0, 0, NULL
,
558 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
559 SCTP_ULPEVENT(event
));
561 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
562 SCTP_STATE(SCTP_STATE_CLOSED
));
564 /* SEND_FAILED sent later when cleaning up the association. */
565 asoc
->outqueue
.error
= error
;
566 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
569 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
570 static void sctp_cmd_assoc_failed(sctp_cmd_seq_t
*commands
,
571 struct sctp_association
*asoc
,
572 sctp_event_t event_type
,
573 sctp_subtype_t subtype
,
574 struct sctp_chunk
*chunk
,
577 struct sctp_ulpevent
*event
;
578 struct sctp_chunk
*abort
;
579 /* Cancel any partial delivery in progress. */
580 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
582 if (event_type
== SCTP_EVENT_T_CHUNK
&& subtype
.chunk
== SCTP_CID_ABORT
)
583 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
584 (__u16
)error
, 0, 0, chunk
,
587 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
588 (__u16
)error
, 0, 0, NULL
,
591 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
592 SCTP_ULPEVENT(event
));
594 if (asoc
->overall_error_count
>= asoc
->max_retrans
) {
595 abort
= sctp_make_violation_max_retrans(asoc
, chunk
);
597 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
601 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
602 SCTP_STATE(SCTP_STATE_CLOSED
));
604 /* SEND_FAILED sent later when cleaning up the association. */
605 asoc
->outqueue
.error
= error
;
606 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
609 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
610 * inside the cookie. In reality, this is only used for INIT-ACK processing
611 * since all other cases use "temporary" associations and can do all
612 * their work in statefuns directly.
614 static int sctp_cmd_process_init(sctp_cmd_seq_t
*commands
,
615 struct sctp_association
*asoc
,
616 struct sctp_chunk
*chunk
,
617 sctp_init_chunk_t
*peer_init
,
622 /* We only process the init as a sideeffect in a single
623 * case. This is when we process the INIT-ACK. If we
624 * fail during INIT processing (due to malloc problems),
625 * just return the error and stop processing the stack.
627 if (!sctp_process_init(asoc
, chunk
, sctp_source(chunk
), peer_init
, gfp
))
635 /* Helper function to break out starting up of heartbeat timers. */
636 static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t
*cmds
,
637 struct sctp_association
*asoc
)
639 struct sctp_transport
*t
;
641 /* Start a heartbeat timer for each transport on the association.
642 * hold a reference on the transport to make sure none of
643 * the needed data structures go away.
645 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
, transports
) {
647 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
648 sctp_transport_hold(t
);
652 static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t
*cmds
,
653 struct sctp_association
*asoc
)
655 struct sctp_transport
*t
;
657 /* Stop all heartbeat timers. */
659 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
661 if (del_timer(&t
->hb_timer
))
662 sctp_transport_put(t
);
666 /* Helper function to stop any pending T3-RTX timers */
667 static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t
*cmds
,
668 struct sctp_association
*asoc
)
670 struct sctp_transport
*t
;
672 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
674 if (del_timer(&t
->T3_rtx_timer
))
675 sctp_transport_put(t
);
680 /* Helper function to update the heartbeat timer. */
681 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t
*cmds
,
682 struct sctp_transport
*t
)
684 /* Update the heartbeat timer. */
685 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
686 sctp_transport_hold(t
);
689 /* Helper function to handle the reception of an HEARTBEAT ACK. */
690 static void sctp_cmd_transport_on(sctp_cmd_seq_t
*cmds
,
691 struct sctp_association
*asoc
,
692 struct sctp_transport
*t
,
693 struct sctp_chunk
*chunk
)
695 sctp_sender_hb_info_t
*hbinfo
;
696 int was_unconfirmed
= 0;
698 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
699 * HEARTBEAT should clear the error counter of the destination
700 * transport address to which the HEARTBEAT was sent.
705 * Although RFC4960 specifies that the overall error count must
706 * be cleared when a HEARTBEAT ACK is received, we make an
707 * exception while in SHUTDOWN PENDING. If the peer keeps its
708 * window shut forever, we may never be able to transmit our
709 * outstanding data and rely on the retransmission limit be reached
710 * to shutdown the association.
712 if (t
->asoc
->state
!= SCTP_STATE_SHUTDOWN_PENDING
)
713 t
->asoc
->overall_error_count
= 0;
715 /* Clear the hb_sent flag to signal that we had a good
720 /* Mark the destination transport address as active if it is not so
723 if ((t
->state
== SCTP_INACTIVE
) || (t
->state
== SCTP_UNCONFIRMED
)) {
725 sctp_assoc_control_transport(asoc
, t
, SCTP_TRANSPORT_UP
,
726 SCTP_HEARTBEAT_SUCCESS
);
729 if (t
->state
== SCTP_PF
)
730 sctp_assoc_control_transport(asoc
, t
, SCTP_TRANSPORT_UP
,
731 SCTP_HEARTBEAT_SUCCESS
);
733 /* HB-ACK was received for a the proper HB. Consider this
739 /* The receiver of the HEARTBEAT ACK should also perform an
740 * RTT measurement for that destination transport address
741 * using the time value carried in the HEARTBEAT ACK chunk.
742 * If the transport's rto_pending variable has been cleared,
743 * it was most likely due to a retransmit. However, we want
744 * to re-enable it to properly update the rto.
746 if (t
->rto_pending
== 0)
749 hbinfo
= (sctp_sender_hb_info_t
*) chunk
->skb
->data
;
750 sctp_transport_update_rto(t
, (jiffies
- hbinfo
->sent_at
));
752 /* Update the heartbeat timer. */
753 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
754 sctp_transport_hold(t
);
756 if (was_unconfirmed
&& asoc
->peer
.transport_count
== 1)
757 sctp_transport_immediate_rtx(t
);
761 /* Helper function to process the process SACK command. */
762 static int sctp_cmd_process_sack(sctp_cmd_seq_t
*cmds
,
763 struct sctp_association
*asoc
,
764 struct sctp_chunk
*chunk
)
768 if (sctp_outq_sack(&asoc
->outqueue
, chunk
)) {
769 struct net
*net
= sock_net(asoc
->base
.sk
);
771 /* There are no more TSNs awaiting SACK. */
772 err
= sctp_do_sm(net
, SCTP_EVENT_T_OTHER
,
773 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN
),
774 asoc
->state
, asoc
->ep
, asoc
, NULL
,
781 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
782 * the transport for a shutdown chunk.
784 static void sctp_cmd_setup_t2(sctp_cmd_seq_t
*cmds
,
785 struct sctp_association
*asoc
,
786 struct sctp_chunk
*chunk
)
788 struct sctp_transport
*t
;
790 if (chunk
->transport
)
791 t
= chunk
->transport
;
793 t
= sctp_assoc_choose_alter_transport(asoc
,
794 asoc
->shutdown_last_sent_to
);
795 chunk
->transport
= t
;
797 asoc
->shutdown_last_sent_to
= t
;
798 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
] = t
->rto
;
801 /* Helper function to change the state of an association. */
802 static void sctp_cmd_new_state(sctp_cmd_seq_t
*cmds
,
803 struct sctp_association
*asoc
,
806 struct sock
*sk
= asoc
->base
.sk
;
810 pr_debug("%s: asoc:%p[%s]\n", __func__
, asoc
, sctp_state_tbl
[state
]);
812 if (sctp_style(sk
, TCP
)) {
813 /* Change the sk->sk_state of a TCP-style socket that has
814 * successfully completed a connect() call.
816 if (sctp_state(asoc
, ESTABLISHED
) && sctp_sstate(sk
, CLOSED
))
817 sk
->sk_state
= SCTP_SS_ESTABLISHED
;
819 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
820 if (sctp_state(asoc
, SHUTDOWN_RECEIVED
) &&
821 sctp_sstate(sk
, ESTABLISHED
))
822 sk
->sk_shutdown
|= RCV_SHUTDOWN
;
825 if (sctp_state(asoc
, COOKIE_WAIT
)) {
826 /* Reset init timeouts since they may have been
827 * increased due to timer expirations.
829 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] =
831 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] =
835 if (sctp_state(asoc
, ESTABLISHED
) ||
836 sctp_state(asoc
, CLOSED
) ||
837 sctp_state(asoc
, SHUTDOWN_RECEIVED
)) {
838 /* Wake up any processes waiting in the asoc's wait queue in
839 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
841 if (waitqueue_active(&asoc
->wait
))
842 wake_up_interruptible(&asoc
->wait
);
844 /* Wake up any processes waiting in the sk's sleep queue of
845 * a TCP-style or UDP-style peeled-off socket in
846 * sctp_wait_for_accept() or sctp_wait_for_packet().
847 * For a UDP-style socket, the waiters are woken up by the
850 if (!sctp_style(sk
, UDP
))
851 sk
->sk_state_change(sk
);
855 /* Helper function to delete an association. */
856 static void sctp_cmd_delete_tcb(sctp_cmd_seq_t
*cmds
,
857 struct sctp_association
*asoc
)
859 struct sock
*sk
= asoc
->base
.sk
;
861 /* If it is a non-temporary association belonging to a TCP-style
862 * listening socket that is not closed, do not free it so that accept()
863 * can pick it up later.
865 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
) &&
866 (!asoc
->temp
) && (sk
->sk_shutdown
!= SHUTDOWN_MASK
))
869 BUG_ON(asoc
->peer
.primary_path
== NULL
);
870 sctp_unhash_established(asoc
);
871 sctp_association_free(asoc
);
875 * ADDIP Section 4.1 ASCONF Chunk Procedures
876 * A4) Start a T-4 RTO timer, using the RTO value of the selected
877 * destination address (we use active path instead of primary path just
878 * because primary path may be inactive.
880 static void sctp_cmd_setup_t4(sctp_cmd_seq_t
*cmds
,
881 struct sctp_association
*asoc
,
882 struct sctp_chunk
*chunk
)
884 struct sctp_transport
*t
;
886 t
= sctp_assoc_choose_alter_transport(asoc
, chunk
->transport
);
887 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T4_RTO
] = t
->rto
;
888 chunk
->transport
= t
;
891 /* Process an incoming Operation Error Chunk. */
892 static void sctp_cmd_process_operr(sctp_cmd_seq_t
*cmds
,
893 struct sctp_association
*asoc
,
894 struct sctp_chunk
*chunk
)
896 struct sctp_errhdr
*err_hdr
;
897 struct sctp_ulpevent
*ev
;
899 while (chunk
->chunk_end
> chunk
->skb
->data
) {
900 err_hdr
= (struct sctp_errhdr
*)(chunk
->skb
->data
);
902 ev
= sctp_ulpevent_make_remote_error(asoc
, chunk
, 0,
907 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
909 switch (err_hdr
->cause
) {
910 case SCTP_ERROR_UNKNOWN_CHUNK
:
912 sctp_chunkhdr_t
*unk_chunk_hdr
;
914 unk_chunk_hdr
= (sctp_chunkhdr_t
*)err_hdr
->variable
;
915 switch (unk_chunk_hdr
->type
) {
916 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with
917 * an ERROR chunk reporting that it did not recognized
918 * the ASCONF chunk type, the sender of the ASCONF MUST
919 * NOT send any further ASCONF chunks and MUST stop its
922 case SCTP_CID_ASCONF
:
923 if (asoc
->peer
.asconf_capable
== 0)
926 asoc
->peer
.asconf_capable
= 0;
927 sctp_add_cmd_sf(cmds
, SCTP_CMD_TIMER_STOP
,
928 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO
));
941 /* Process variable FWDTSN chunk information. */
942 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq
*ulpq
,
943 struct sctp_chunk
*chunk
)
945 struct sctp_fwdtsn_skip
*skip
;
946 /* Walk through all the skipped SSNs */
947 sctp_walk_fwdtsn(skip
, chunk
) {
948 sctp_ulpq_skip(ulpq
, ntohs(skip
->stream
), ntohs(skip
->ssn
));
952 /* Helper function to remove the association non-primary peer
955 static void sctp_cmd_del_non_primary(struct sctp_association
*asoc
)
957 struct sctp_transport
*t
;
958 struct list_head
*pos
;
959 struct list_head
*temp
;
961 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
962 t
= list_entry(pos
, struct sctp_transport
, transports
);
963 if (!sctp_cmp_addr_exact(&t
->ipaddr
,
964 &asoc
->peer
.primary_addr
)) {
965 sctp_assoc_del_peer(asoc
, &t
->ipaddr
);
970 /* Helper function to set sk_err on a 1-1 style socket. */
971 static void sctp_cmd_set_sk_err(struct sctp_association
*asoc
, int error
)
973 struct sock
*sk
= asoc
->base
.sk
;
975 if (!sctp_style(sk
, UDP
))
979 /* Helper function to generate an association change event */
980 static void sctp_cmd_assoc_change(sctp_cmd_seq_t
*commands
,
981 struct sctp_association
*asoc
,
984 struct sctp_ulpevent
*ev
;
986 ev
= sctp_ulpevent_make_assoc_change(asoc
, 0, state
, 0,
987 asoc
->c
.sinit_num_ostreams
,
988 asoc
->c
.sinit_max_instreams
,
991 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
994 /* Helper function to generate an adaptation indication event */
995 static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t
*commands
,
996 struct sctp_association
*asoc
)
998 struct sctp_ulpevent
*ev
;
1000 ev
= sctp_ulpevent_make_adaptation_indication(asoc
, GFP_ATOMIC
);
1003 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
1007 static void sctp_cmd_t1_timer_update(struct sctp_association
*asoc
,
1008 sctp_event_timeout_t timer
,
1011 struct sctp_transport
*t
;
1013 t
= asoc
->init_last_sent_to
;
1014 asoc
->init_err_counter
++;
1016 if (t
->init_sent_count
> (asoc
->init_cycle
+ 1)) {
1017 asoc
->timeouts
[timer
] *= 2;
1018 if (asoc
->timeouts
[timer
] > asoc
->max_init_timeo
) {
1019 asoc
->timeouts
[timer
] = asoc
->max_init_timeo
;
1023 pr_debug("%s: T1[%s] timeout adjustment init_err_counter:%d"
1024 " cycle:%d timeout:%ld\n", __func__
, name
,
1025 asoc
->init_err_counter
, asoc
->init_cycle
,
1026 asoc
->timeouts
[timer
]);
1031 /* Send the whole message, chunk by chunk, to the outqueue.
1032 * This way the whole message is queued up and bundling if
1033 * encouraged for small fragments.
1035 static int sctp_cmd_send_msg(struct sctp_association
*asoc
,
1036 struct sctp_datamsg
*msg
)
1038 struct sctp_chunk
*chunk
;
1041 list_for_each_entry(chunk
, &msg
->chunks
, frag_list
) {
1042 error
= sctp_outq_tail(&asoc
->outqueue
, chunk
);
1051 /* Sent the next ASCONF packet currently stored in the association.
1052 * This happens after the ASCONF_ACK was succeffully processed.
1054 static void sctp_cmd_send_asconf(struct sctp_association
*asoc
)
1056 struct net
*net
= sock_net(asoc
->base
.sk
);
1058 /* Send the next asconf chunk from the addip chunk
1061 if (!list_empty(&asoc
->addip_chunk_list
)) {
1062 struct list_head
*entry
= asoc
->addip_chunk_list
.next
;
1063 struct sctp_chunk
*asconf
= list_entry(entry
,
1064 struct sctp_chunk
, list
);
1065 list_del_init(entry
);
1067 /* Hold the chunk until an ASCONF_ACK is received. */
1068 sctp_chunk_hold(asconf
);
1069 if (sctp_primitive_ASCONF(net
, asoc
, asconf
))
1070 sctp_chunk_free(asconf
);
1072 asoc
->addip_last_asconf
= asconf
;
1077 /* These three macros allow us to pull the debugging code out of the
1078 * main flow of sctp_do_sm() to keep attention focused on the real
1079 * functionality there.
1081 #define debug_pre_sfn() \
1082 pr_debug("%s[pre-fn]: ep:%p, %s, %s, asoc:%p[%s], %s\n", __func__, \
1083 ep, sctp_evttype_tbl[event_type], (*debug_fn)(subtype), \
1084 asoc, sctp_state_tbl[state], state_fn->name)
1086 #define debug_post_sfn() \
1087 pr_debug("%s[post-fn]: asoc:%p, status:%s\n", __func__, asoc, \
1088 sctp_status_tbl[status])
1090 #define debug_post_sfx() \
1091 pr_debug("%s[post-sfx]: error:%d, asoc:%p[%s]\n", __func__, error, \
1092 asoc, sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
1093 sctp_assoc2id(asoc))) ? asoc->state : SCTP_STATE_CLOSED])
1096 * This is the master state machine processing function.
1098 * If you want to understand all of lksctp, this is a
1099 * good place to start.
1101 int sctp_do_sm(struct net
*net
, sctp_event_t event_type
, sctp_subtype_t subtype
,
1103 struct sctp_endpoint
*ep
,
1104 struct sctp_association
*asoc
,
1108 sctp_cmd_seq_t commands
;
1109 const sctp_sm_table_entry_t
*state_fn
;
1110 sctp_disposition_t status
;
1112 typedef const char *(printfn_t
)(sctp_subtype_t
);
1113 static printfn_t
*table
[] = {
1114 NULL
, sctp_cname
, sctp_tname
, sctp_oname
, sctp_pname
,
1116 printfn_t
*debug_fn
__attribute__ ((unused
)) = table
[event_type
];
1118 /* Look up the state function, run it, and then process the
1119 * side effects. These three steps are the heart of lksctp.
1121 state_fn
= sctp_sm_lookup_event(net
, event_type
, state
, subtype
);
1123 sctp_init_cmd_seq(&commands
);
1126 status
= (*state_fn
->fn
)(net
, ep
, asoc
, subtype
, event_arg
, &commands
);
1129 error
= sctp_side_effects(event_type
, subtype
, state
,
1130 ep
, asoc
, event_arg
, status
,
1137 /*****************************************************************
1138 * This the master state function side effect processing function.
1139 *****************************************************************/
1140 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
1142 struct sctp_endpoint
*ep
,
1143 struct sctp_association
*asoc
,
1145 sctp_disposition_t status
,
1146 sctp_cmd_seq_t
*commands
,
1151 /* FIXME - Most of the dispositions left today would be categorized
1152 * as "exceptional" dispositions. For those dispositions, it
1153 * may not be proper to run through any of the commands at all.
1154 * For example, the command interpreter might be run only with
1155 * disposition SCTP_DISPOSITION_CONSUME.
1157 if (0 != (error
= sctp_cmd_interpreter(event_type
, subtype
, state
,
1164 case SCTP_DISPOSITION_DISCARD
:
1165 pr_debug("%s: ignored sctp protocol event - state:%d, "
1166 "event_type:%d, event_id:%d\n", __func__
, state
,
1167 event_type
, subtype
.chunk
);
1170 case SCTP_DISPOSITION_NOMEM
:
1171 /* We ran out of memory, so we need to discard this
1174 /* BUG--we should now recover some memory, probably by
1180 case SCTP_DISPOSITION_DELETE_TCB
:
1181 /* This should now be a command. */
1184 case SCTP_DISPOSITION_CONSUME
:
1185 case SCTP_DISPOSITION_ABORT
:
1187 * We should no longer have much work to do here as the
1188 * real work has been done as explicit commands above.
1192 case SCTP_DISPOSITION_VIOLATION
:
1193 net_err_ratelimited("protocol violation state %d chunkid %d\n",
1194 state
, subtype
.chunk
);
1197 case SCTP_DISPOSITION_NOT_IMPL
:
1198 pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n",
1199 state
, event_type
, subtype
.chunk
);
1202 case SCTP_DISPOSITION_BUG
:
1203 pr_err("bug in state %d, event_type %d, event_id %d\n",
1204 state
, event_type
, subtype
.chunk
);
1209 pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n",
1210 status
, state
, event_type
, subtype
.chunk
);
1219 /********************************************************************
1220 * 2nd Level Abstractions
1221 ********************************************************************/
1223 /* This is the side-effect interpreter. */
1224 static int sctp_cmd_interpreter(sctp_event_t event_type
,
1225 sctp_subtype_t subtype
,
1227 struct sctp_endpoint
*ep
,
1228 struct sctp_association
*asoc
,
1230 sctp_disposition_t status
,
1231 sctp_cmd_seq_t
*commands
,
1237 struct sctp_chunk
*new_obj
;
1238 struct sctp_chunk
*chunk
= NULL
;
1239 struct sctp_packet
*packet
;
1240 struct timer_list
*timer
;
1241 unsigned long timeout
;
1242 struct sctp_transport
*t
;
1243 struct sctp_sackhdr sackh
;
1246 if (SCTP_EVENT_T_TIMEOUT
!= event_type
)
1249 /* Note: This whole file is a huge candidate for rework.
1250 * For example, each command could either have its own handler, so
1251 * the loop would look like:
1253 * cmd->handle(x, y, z)
1256 while (NULL
!= (cmd
= sctp_next_cmd(commands
))) {
1257 switch (cmd
->verb
) {
1262 case SCTP_CMD_NEW_ASOC
:
1263 /* Register a new association. */
1265 sctp_outq_uncork(&asoc
->outqueue
);
1269 /* Register with the endpoint. */
1270 asoc
= cmd
->obj
.asoc
;
1271 BUG_ON(asoc
->peer
.primary_path
== NULL
);
1272 sctp_endpoint_add_asoc(ep
, asoc
);
1273 sctp_hash_established(asoc
);
1276 case SCTP_CMD_UPDATE_ASSOC
:
1277 sctp_assoc_update(asoc
, cmd
->obj
.asoc
);
1280 case SCTP_CMD_PURGE_OUTQUEUE
:
1281 sctp_outq_teardown(&asoc
->outqueue
);
1284 case SCTP_CMD_DELETE_TCB
:
1286 sctp_outq_uncork(&asoc
->outqueue
);
1289 /* Delete the current association. */
1290 sctp_cmd_delete_tcb(commands
, asoc
);
1294 case SCTP_CMD_NEW_STATE
:
1295 /* Enter a new state. */
1296 sctp_cmd_new_state(commands
, asoc
, cmd
->obj
.state
);
1299 case SCTP_CMD_REPORT_TSN
:
1300 /* Record the arrival of a TSN. */
1301 error
= sctp_tsnmap_mark(&asoc
->peer
.tsn_map
,
1302 cmd
->obj
.u32
, NULL
);
1305 case SCTP_CMD_REPORT_FWDTSN
:
1306 /* Move the Cumulattive TSN Ack ahead. */
1307 sctp_tsnmap_skip(&asoc
->peer
.tsn_map
, cmd
->obj
.u32
);
1309 /* purge the fragmentation queue */
1310 sctp_ulpq_reasm_flushtsn(&asoc
->ulpq
, cmd
->obj
.u32
);
1312 /* Abort any in progress partial delivery. */
1313 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
1316 case SCTP_CMD_PROCESS_FWDTSN
:
1317 sctp_cmd_process_fwdtsn(&asoc
->ulpq
, cmd
->obj
.chunk
);
1320 case SCTP_CMD_GEN_SACK
:
1321 /* Generate a Selective ACK.
1322 * The argument tells us whether to just count
1323 * the packet and MAYBE generate a SACK, or
1326 force
= cmd
->obj
.i32
;
1327 error
= sctp_gen_sack(asoc
, force
, commands
);
1330 case SCTP_CMD_PROCESS_SACK
:
1331 /* Process an inbound SACK. */
1332 error
= sctp_cmd_process_sack(commands
, asoc
,
1336 case SCTP_CMD_GEN_INIT_ACK
:
1337 /* Generate an INIT ACK chunk. */
1338 new_obj
= sctp_make_init_ack(asoc
, chunk
, GFP_ATOMIC
,
1343 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1344 SCTP_CHUNK(new_obj
));
1347 case SCTP_CMD_PEER_INIT
:
1348 /* Process a unified INIT from the peer.
1349 * Note: Only used during INIT-ACK processing. If
1350 * there is an error just return to the outter
1351 * layer which will bail.
1353 error
= sctp_cmd_process_init(commands
, asoc
, chunk
,
1354 cmd
->obj
.init
, gfp
);
1357 case SCTP_CMD_GEN_COOKIE_ECHO
:
1358 /* Generate a COOKIE ECHO chunk. */
1359 new_obj
= sctp_make_cookie_echo(asoc
, chunk
);
1362 sctp_chunk_free(cmd
->obj
.chunk
);
1365 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1366 SCTP_CHUNK(new_obj
));
1368 /* If there is an ERROR chunk to be sent along with
1369 * the COOKIE_ECHO, send it, too.
1372 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1373 SCTP_CHUNK(cmd
->obj
.chunk
));
1375 if (new_obj
->transport
) {
1376 new_obj
->transport
->init_sent_count
++;
1377 asoc
->init_last_sent_to
= new_obj
->transport
;
1380 /* FIXME - Eventually come up with a cleaner way to
1381 * enabling COOKIE-ECHO + DATA bundling during
1382 * multihoming stale cookie scenarios, the following
1383 * command plays with asoc->peer.retran_path to
1384 * avoid the problem of sending the COOKIE-ECHO and
1385 * DATA in different paths, which could result
1386 * in the association being ABORTed if the DATA chunk
1387 * is processed first by the server. Checking the
1388 * init error counter simply causes this command
1389 * to be executed only during failed attempts of
1390 * association establishment.
1392 if ((asoc
->peer
.retran_path
!=
1393 asoc
->peer
.primary_path
) &&
1394 (asoc
->init_err_counter
> 0)) {
1395 sctp_add_cmd_sf(commands
,
1396 SCTP_CMD_FORCE_PRIM_RETRAN
,
1402 case SCTP_CMD_GEN_SHUTDOWN
:
1403 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1404 * Reset error counts.
1406 asoc
->overall_error_count
= 0;
1408 /* Generate a SHUTDOWN chunk. */
1409 new_obj
= sctp_make_shutdown(asoc
, chunk
);
1412 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1413 SCTP_CHUNK(new_obj
));
1416 case SCTP_CMD_CHUNK_ULP
:
1417 /* Send a chunk to the sockets layer. */
1418 pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n",
1419 __func__
, cmd
->obj
.chunk
, &asoc
->ulpq
);
1421 sctp_ulpq_tail_data(&asoc
->ulpq
, cmd
->obj
.chunk
,
1425 case SCTP_CMD_EVENT_ULP
:
1426 /* Send a notification to the sockets layer. */
1427 pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n",
1428 __func__
, cmd
->obj
.ulpevent
, &asoc
->ulpq
);
1430 sctp_ulpq_tail_event(&asoc
->ulpq
, cmd
->obj
.ulpevent
);
1433 case SCTP_CMD_REPLY
:
1434 /* If an caller has not already corked, do cork. */
1435 if (!asoc
->outqueue
.cork
) {
1436 sctp_outq_cork(&asoc
->outqueue
);
1439 /* Send a chunk to our peer. */
1440 error
= sctp_outq_tail(&asoc
->outqueue
, cmd
->obj
.chunk
);
1443 case SCTP_CMD_SEND_PKT
:
1444 /* Send a full packet to our peer. */
1445 packet
= cmd
->obj
.packet
;
1446 sctp_packet_transmit(packet
);
1447 sctp_ootb_pkt_free(packet
);
1450 case SCTP_CMD_T1_RETRAN
:
1451 /* Mark a transport for retransmission. */
1452 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1456 case SCTP_CMD_RETRAN
:
1457 /* Mark a transport for retransmission. */
1458 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1462 case SCTP_CMD_ECN_CE
:
1463 /* Do delayed CE processing. */
1464 sctp_do_ecn_ce_work(asoc
, cmd
->obj
.u32
);
1467 case SCTP_CMD_ECN_ECNE
:
1468 /* Do delayed ECNE processing. */
1469 new_obj
= sctp_do_ecn_ecne_work(asoc
, cmd
->obj
.u32
,
1472 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1473 SCTP_CHUNK(new_obj
));
1476 case SCTP_CMD_ECN_CWR
:
1477 /* Do delayed CWR processing. */
1478 sctp_do_ecn_cwr_work(asoc
, cmd
->obj
.u32
);
1481 case SCTP_CMD_SETUP_T2
:
1482 sctp_cmd_setup_t2(commands
, asoc
, cmd
->obj
.chunk
);
1485 case SCTP_CMD_TIMER_START_ONCE
:
1486 timer
= &asoc
->timers
[cmd
->obj
.to
];
1488 if (timer_pending(timer
))
1492 case SCTP_CMD_TIMER_START
:
1493 timer
= &asoc
->timers
[cmd
->obj
.to
];
1494 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1497 timer
->expires
= jiffies
+ timeout
;
1498 sctp_association_hold(asoc
);
1502 case SCTP_CMD_TIMER_RESTART
:
1503 timer
= &asoc
->timers
[cmd
->obj
.to
];
1504 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1505 if (!mod_timer(timer
, jiffies
+ timeout
))
1506 sctp_association_hold(asoc
);
1509 case SCTP_CMD_TIMER_STOP
:
1510 timer
= &asoc
->timers
[cmd
->obj
.to
];
1511 if (del_timer(timer
))
1512 sctp_association_put(asoc
);
1515 case SCTP_CMD_INIT_CHOOSE_TRANSPORT
:
1516 chunk
= cmd
->obj
.chunk
;
1517 t
= sctp_assoc_choose_alter_transport(asoc
,
1518 asoc
->init_last_sent_to
);
1519 asoc
->init_last_sent_to
= t
;
1520 chunk
->transport
= t
;
1521 t
->init_sent_count
++;
1522 /* Set the new transport as primary */
1523 sctp_assoc_set_primary(asoc
, t
);
1526 case SCTP_CMD_INIT_RESTART
:
1527 /* Do the needed accounting and updates
1528 * associated with restarting an initialization
1529 * timer. Only multiply the timeout by two if
1530 * all transports have been tried at the current
1533 sctp_cmd_t1_timer_update(asoc
,
1534 SCTP_EVENT_TIMEOUT_T1_INIT
,
1537 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
1538 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT
));
1541 case SCTP_CMD_COOKIEECHO_RESTART
:
1542 /* Do the needed accounting and updates
1543 * associated with restarting an initialization
1544 * timer. Only multiply the timeout by two if
1545 * all transports have been tried at the current
1548 sctp_cmd_t1_timer_update(asoc
,
1549 SCTP_EVENT_TIMEOUT_T1_COOKIE
,
1552 /* If we've sent any data bundled with
1553 * COOKIE-ECHO we need to resend.
1555 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
1557 sctp_retransmit_mark(&asoc
->outqueue
, t
,
1561 sctp_add_cmd_sf(commands
,
1562 SCTP_CMD_TIMER_RESTART
,
1563 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE
));
1566 case SCTP_CMD_INIT_FAILED
:
1567 sctp_cmd_init_failed(commands
, asoc
, cmd
->obj
.err
);
1570 case SCTP_CMD_ASSOC_FAILED
:
1571 sctp_cmd_assoc_failed(commands
, asoc
, event_type
,
1572 subtype
, chunk
, cmd
->obj
.err
);
1575 case SCTP_CMD_INIT_COUNTER_INC
:
1576 asoc
->init_err_counter
++;
1579 case SCTP_CMD_INIT_COUNTER_RESET
:
1580 asoc
->init_err_counter
= 0;
1581 asoc
->init_cycle
= 0;
1582 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
1584 t
->init_sent_count
= 0;
1588 case SCTP_CMD_REPORT_DUP
:
1589 sctp_tsnmap_mark_dup(&asoc
->peer
.tsn_map
,
1593 case SCTP_CMD_REPORT_BAD_TAG
:
1594 pr_debug("%s: vtag mismatch!\n", __func__
);
1597 case SCTP_CMD_STRIKE
:
1598 /* Mark one strike against a transport. */
1599 sctp_do_8_2_transport_strike(commands
, asoc
,
1600 cmd
->obj
.transport
, 0);
1603 case SCTP_CMD_TRANSPORT_IDLE
:
1604 t
= cmd
->obj
.transport
;
1605 sctp_transport_lower_cwnd(t
, SCTP_LOWER_CWND_INACTIVE
);
1608 case SCTP_CMD_TRANSPORT_HB_SENT
:
1609 t
= cmd
->obj
.transport
;
1610 sctp_do_8_2_transport_strike(commands
, asoc
,
1615 case SCTP_CMD_TRANSPORT_ON
:
1616 t
= cmd
->obj
.transport
;
1617 sctp_cmd_transport_on(commands
, asoc
, t
, chunk
);
1620 case SCTP_CMD_HB_TIMERS_START
:
1621 sctp_cmd_hb_timers_start(commands
, asoc
);
1624 case SCTP_CMD_HB_TIMER_UPDATE
:
1625 t
= cmd
->obj
.transport
;
1626 sctp_cmd_hb_timer_update(commands
, t
);
1629 case SCTP_CMD_HB_TIMERS_STOP
:
1630 sctp_cmd_hb_timers_stop(commands
, asoc
);
1633 case SCTP_CMD_REPORT_ERROR
:
1634 error
= cmd
->obj
.error
;
1637 case SCTP_CMD_PROCESS_CTSN
:
1638 /* Dummy up a SACK for processing. */
1639 sackh
.cum_tsn_ack
= cmd
->obj
.be32
;
1640 sackh
.a_rwnd
= asoc
->peer
.rwnd
+
1641 asoc
->outqueue
.outstanding_bytes
;
1642 sackh
.num_gap_ack_blocks
= 0;
1643 sackh
.num_dup_tsns
= 0;
1644 chunk
->subh
.sack_hdr
= &sackh
;
1645 sctp_add_cmd_sf(commands
, SCTP_CMD_PROCESS_SACK
,
1649 case SCTP_CMD_DISCARD_PACKET
:
1650 /* We need to discard the whole packet.
1651 * Uncork the queue since there might be
1654 chunk
->pdiscard
= 1;
1656 sctp_outq_uncork(&asoc
->outqueue
);
1661 case SCTP_CMD_RTO_PENDING
:
1662 t
= cmd
->obj
.transport
;
1666 case SCTP_CMD_PART_DELIVER
:
1667 sctp_ulpq_partial_delivery(&asoc
->ulpq
, GFP_ATOMIC
);
1670 case SCTP_CMD_RENEGE
:
1671 sctp_ulpq_renege(&asoc
->ulpq
, cmd
->obj
.chunk
,
1675 case SCTP_CMD_SETUP_T4
:
1676 sctp_cmd_setup_t4(commands
, asoc
, cmd
->obj
.chunk
);
1679 case SCTP_CMD_PROCESS_OPERR
:
1680 sctp_cmd_process_operr(commands
, asoc
, chunk
);
1682 case SCTP_CMD_CLEAR_INIT_TAG
:
1683 asoc
->peer
.i
.init_tag
= 0;
1685 case SCTP_CMD_DEL_NON_PRIMARY
:
1686 sctp_cmd_del_non_primary(asoc
);
1688 case SCTP_CMD_T3_RTX_TIMERS_STOP
:
1689 sctp_cmd_t3_rtx_timers_stop(commands
, asoc
);
1691 case SCTP_CMD_FORCE_PRIM_RETRAN
:
1692 t
= asoc
->peer
.retran_path
;
1693 asoc
->peer
.retran_path
= asoc
->peer
.primary_path
;
1694 error
= sctp_outq_uncork(&asoc
->outqueue
);
1696 asoc
->peer
.retran_path
= t
;
1698 case SCTP_CMD_SET_SK_ERR
:
1699 sctp_cmd_set_sk_err(asoc
, cmd
->obj
.error
);
1701 case SCTP_CMD_ASSOC_CHANGE
:
1702 sctp_cmd_assoc_change(commands
, asoc
,
1705 case SCTP_CMD_ADAPTATION_IND
:
1706 sctp_cmd_adaptation_ind(commands
, asoc
);
1709 case SCTP_CMD_ASSOC_SHKEY
:
1710 error
= sctp_auth_asoc_init_active_key(asoc
,
1713 case SCTP_CMD_UPDATE_INITTAG
:
1714 asoc
->peer
.i
.init_tag
= cmd
->obj
.u32
;
1716 case SCTP_CMD_SEND_MSG
:
1717 if (!asoc
->outqueue
.cork
) {
1718 sctp_outq_cork(&asoc
->outqueue
);
1721 error
= sctp_cmd_send_msg(asoc
, cmd
->obj
.msg
);
1723 case SCTP_CMD_SEND_NEXT_ASCONF
:
1724 sctp_cmd_send_asconf(asoc
);
1726 case SCTP_CMD_PURGE_ASCONF_QUEUE
:
1727 sctp_asconf_queue_teardown(asoc
);
1730 case SCTP_CMD_SET_ASOC
:
1731 asoc
= cmd
->obj
.asoc
;
1735 pr_warn("Impossible command: %u\n",
1745 /* If this is in response to a received chunk, wait until
1746 * we are done with the packet to open the queue so that we don't
1747 * send multiple packets in response to a single request.
1749 if (asoc
&& SCTP_EVENT_T_CHUNK
== event_type
&& chunk
) {
1750 if (chunk
->end_of_packet
|| chunk
->singleton
)
1751 error
= sctp_outq_uncork(&asoc
->outqueue
);
1752 } else if (local_cork
)
1753 error
= sctp_outq_uncork(&asoc
->outqueue
);