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 net
*net
= sock_net(asoc
->base
.sk
);
249 /* Check whether a task is in the sock. */
251 bh_lock_sock(asoc
->base
.sk
);
252 if (sock_owned_by_user(asoc
->base
.sk
)) {
253 pr_debug("%s: sock is busy\n", __func__
);
255 /* Try again later. */
256 if (!mod_timer(&transport
->T3_rtx_timer
, jiffies
+ (HZ
/20)))
257 sctp_transport_hold(transport
);
261 /* Is this transport really dead and just waiting around for
262 * the timer to let go of the reference?
267 /* Run through the state machine. */
268 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
269 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX
),
272 transport
, GFP_ATOMIC
);
275 asoc
->base
.sk
->sk_err
= -error
;
278 bh_unlock_sock(asoc
->base
.sk
);
279 sctp_transport_put(transport
);
282 /* This is a sa interface for producing timeout events. It works
283 * for timeouts which use the association as their parameter.
285 static void sctp_generate_timeout_event(struct sctp_association
*asoc
,
286 sctp_event_timeout_t timeout_type
)
288 struct net
*net
= sock_net(asoc
->base
.sk
);
291 bh_lock_sock(asoc
->base
.sk
);
292 if (sock_owned_by_user(asoc
->base
.sk
)) {
293 pr_debug("%s: sock is busy: timer %d\n", __func__
,
296 /* Try again later. */
297 if (!mod_timer(&asoc
->timers
[timeout_type
], jiffies
+ (HZ
/20)))
298 sctp_association_hold(asoc
);
302 /* Is this association really dead and just waiting around for
303 * the timer to let go of the reference?
308 /* Run through the state machine. */
309 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
310 SCTP_ST_TIMEOUT(timeout_type
),
311 asoc
->state
, asoc
->ep
, asoc
,
312 (void *)timeout_type
, GFP_ATOMIC
);
315 asoc
->base
.sk
->sk_err
= -error
;
318 bh_unlock_sock(asoc
->base
.sk
);
319 sctp_association_put(asoc
);
322 static void sctp_generate_t1_cookie_event(unsigned long data
)
324 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
325 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_COOKIE
);
328 static void sctp_generate_t1_init_event(unsigned long data
)
330 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
331 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_INIT
);
334 static void sctp_generate_t2_shutdown_event(unsigned long data
)
336 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
337 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
);
340 static void sctp_generate_t4_rto_event(unsigned long data
)
342 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
343 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T4_RTO
);
346 static void sctp_generate_t5_shutdown_guard_event(unsigned long data
)
348 struct sctp_association
*asoc
= (struct sctp_association
*)data
;
349 sctp_generate_timeout_event(asoc
,
350 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD
);
352 } /* sctp_generate_t5_shutdown_guard_event() */
354 static void sctp_generate_autoclose_event(unsigned long data
)
356 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
357 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_AUTOCLOSE
);
360 /* Generate a heart beat event. If the sock is busy, reschedule. Make
361 * sure that the transport is still valid.
363 void sctp_generate_heartbeat_event(unsigned long data
)
366 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
367 struct sctp_association
*asoc
= transport
->asoc
;
368 struct net
*net
= sock_net(asoc
->base
.sk
);
370 bh_lock_sock(asoc
->base
.sk
);
371 if (sock_owned_by_user(asoc
->base
.sk
)) {
372 pr_debug("%s: sock is busy\n", __func__
);
374 /* Try again later. */
375 if (!mod_timer(&transport
->hb_timer
, jiffies
+ (HZ
/20)))
376 sctp_transport_hold(transport
);
380 /* Is this structure just waiting around for us to actually
386 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
387 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT
),
388 asoc
->state
, asoc
->ep
, asoc
,
389 transport
, GFP_ATOMIC
);
392 asoc
->base
.sk
->sk_err
= -error
;
395 bh_unlock_sock(asoc
->base
.sk
);
396 sctp_transport_put(transport
);
399 /* Handle the timeout of the ICMP protocol unreachable timer. Trigger
400 * the correct state machine transition that will close the association.
402 void sctp_generate_proto_unreach_event(unsigned long data
)
404 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
405 struct sctp_association
*asoc
= transport
->asoc
;
406 struct net
*net
= sock_net(asoc
->base
.sk
);
408 bh_lock_sock(asoc
->base
.sk
);
409 if (sock_owned_by_user(asoc
->base
.sk
)) {
410 pr_debug("%s: sock is busy\n", __func__
);
412 /* Try again later. */
413 if (!mod_timer(&transport
->proto_unreach_timer
,
415 sctp_association_hold(asoc
);
419 /* Is this structure just waiting around for us to actually
425 sctp_do_sm(net
, SCTP_EVENT_T_OTHER
,
426 SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH
),
427 asoc
->state
, asoc
->ep
, asoc
, transport
, GFP_ATOMIC
);
430 bh_unlock_sock(asoc
->base
.sk
);
431 sctp_association_put(asoc
);
435 /* Inject a SACK Timeout event into the state machine. */
436 static void sctp_generate_sack_event(unsigned long data
)
438 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
439 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_SACK
);
442 sctp_timer_event_t
*sctp_timer_events
[SCTP_NUM_TIMEOUT_TYPES
] = {
444 sctp_generate_t1_cookie_event
,
445 sctp_generate_t1_init_event
,
446 sctp_generate_t2_shutdown_event
,
448 sctp_generate_t4_rto_event
,
449 sctp_generate_t5_shutdown_guard_event
,
451 sctp_generate_sack_event
,
452 sctp_generate_autoclose_event
,
456 /* RFC 2960 8.2 Path Failure Detection
458 * When its peer endpoint is multi-homed, an endpoint should keep a
459 * error counter for each of the destination transport addresses of the
462 * Each time the T3-rtx timer expires on any address, or when a
463 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
464 * the error counter of that destination address will be incremented.
465 * When the value in the error counter exceeds the protocol parameter
466 * 'Path.Max.Retrans' of that destination address, the endpoint should
467 * mark the destination transport address as inactive, and a
468 * notification SHOULD be sent to the upper layer.
471 static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t
*commands
,
472 struct sctp_association
*asoc
,
473 struct sctp_transport
*transport
,
476 /* The check for association's overall error counter exceeding the
477 * threshold is done in the state function.
479 /* We are here due to a timer expiration. If the timer was
480 * not a HEARTBEAT, then normal error tracking is done.
481 * If the timer was a heartbeat, we only increment error counts
482 * when we already have an outstanding HEARTBEAT that has not
484 * Additionally, some tranport states inhibit error increments.
487 asoc
->overall_error_count
++;
488 if (transport
->state
!= SCTP_INACTIVE
)
489 transport
->error_count
++;
490 } else if (transport
->hb_sent
) {
491 if (transport
->state
!= SCTP_UNCONFIRMED
)
492 asoc
->overall_error_count
++;
493 if (transport
->state
!= SCTP_INACTIVE
)
494 transport
->error_count
++;
497 /* If the transport error count is greater than the pf_retrans
498 * threshold, and less than pathmaxrtx, and if the current state
499 * is SCTP_ACTIVE, then mark this transport as Partially Failed,
500 * see SCTP Quick Failover Draft, section 5.1
502 if ((transport
->state
== SCTP_ACTIVE
) &&
503 (asoc
->pf_retrans
< transport
->pathmaxrxt
) &&
504 (transport
->error_count
> asoc
->pf_retrans
)) {
506 sctp_assoc_control_transport(asoc
, transport
,
510 /* Update the hb timer to resend a heartbeat every rto */
511 sctp_cmd_hb_timer_update(commands
, transport
);
514 if (transport
->state
!= SCTP_INACTIVE
&&
515 (transport
->error_count
> transport
->pathmaxrxt
)) {
516 pr_debug("%s: association:%p transport addr:%pISpc failed\n",
517 __func__
, asoc
, &transport
->ipaddr
.sa
);
519 sctp_assoc_control_transport(asoc
, transport
,
521 SCTP_FAILED_THRESHOLD
);
524 /* E2) For the destination address for which the timer
525 * expires, set RTO <- RTO * 2 ("back off the timer"). The
526 * maximum value discussed in rule C7 above (RTO.max) may be
527 * used to provide an upper bound to this doubling operation.
529 * Special Case: the first HB doesn't trigger exponential backoff.
530 * The first unacknowledged HB triggers it. We do this with a flag
531 * that indicates that we have an outstanding HB.
533 if (!is_hb
|| transport
->hb_sent
) {
534 transport
->rto
= min((transport
->rto
* 2), transport
->asoc
->rto_max
);
535 sctp_max_rto(asoc
, transport
);
539 /* Worker routine to handle INIT command failure. */
540 static void sctp_cmd_init_failed(sctp_cmd_seq_t
*commands
,
541 struct sctp_association
*asoc
,
544 struct sctp_ulpevent
*event
;
546 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_CANT_STR_ASSOC
,
547 (__u16
)error
, 0, 0, NULL
,
551 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
552 SCTP_ULPEVENT(event
));
554 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
555 SCTP_STATE(SCTP_STATE_CLOSED
));
557 /* SEND_FAILED sent later when cleaning up the association. */
558 asoc
->outqueue
.error
= error
;
559 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
562 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
563 static void sctp_cmd_assoc_failed(sctp_cmd_seq_t
*commands
,
564 struct sctp_association
*asoc
,
565 sctp_event_t event_type
,
566 sctp_subtype_t subtype
,
567 struct sctp_chunk
*chunk
,
570 struct sctp_ulpevent
*event
;
571 struct sctp_chunk
*abort
;
572 /* Cancel any partial delivery in progress. */
573 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
575 if (event_type
== SCTP_EVENT_T_CHUNK
&& subtype
.chunk
== SCTP_CID_ABORT
)
576 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
577 (__u16
)error
, 0, 0, chunk
,
580 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
581 (__u16
)error
, 0, 0, NULL
,
584 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
585 SCTP_ULPEVENT(event
));
587 if (asoc
->overall_error_count
>= asoc
->max_retrans
) {
588 abort
= sctp_make_violation_max_retrans(asoc
, chunk
);
590 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
594 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
595 SCTP_STATE(SCTP_STATE_CLOSED
));
597 /* SEND_FAILED sent later when cleaning up the association. */
598 asoc
->outqueue
.error
= error
;
599 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
602 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
603 * inside the cookie. In reality, this is only used for INIT-ACK processing
604 * since all other cases use "temporary" associations and can do all
605 * their work in statefuns directly.
607 static int sctp_cmd_process_init(sctp_cmd_seq_t
*commands
,
608 struct sctp_association
*asoc
,
609 struct sctp_chunk
*chunk
,
610 sctp_init_chunk_t
*peer_init
,
615 /* We only process the init as a sideeffect in a single
616 * case. This is when we process the INIT-ACK. If we
617 * fail during INIT processing (due to malloc problems),
618 * just return the error and stop processing the stack.
620 if (!sctp_process_init(asoc
, chunk
, sctp_source(chunk
), peer_init
, gfp
))
628 /* Helper function to break out starting up of heartbeat timers. */
629 static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t
*cmds
,
630 struct sctp_association
*asoc
)
632 struct sctp_transport
*t
;
634 /* Start a heartbeat timer for each transport on the association.
635 * hold a reference on the transport to make sure none of
636 * the needed data structures go away.
638 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
, transports
) {
640 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
641 sctp_transport_hold(t
);
645 static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t
*cmds
,
646 struct sctp_association
*asoc
)
648 struct sctp_transport
*t
;
650 /* Stop all heartbeat timers. */
652 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
654 if (del_timer(&t
->hb_timer
))
655 sctp_transport_put(t
);
659 /* Helper function to stop any pending T3-RTX timers */
660 static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t
*cmds
,
661 struct sctp_association
*asoc
)
663 struct sctp_transport
*t
;
665 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
667 if (del_timer(&t
->T3_rtx_timer
))
668 sctp_transport_put(t
);
673 /* Helper function to update the heartbeat timer. */
674 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t
*cmds
,
675 struct sctp_transport
*t
)
677 /* Update the heartbeat timer. */
678 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
679 sctp_transport_hold(t
);
682 /* Helper function to handle the reception of an HEARTBEAT ACK. */
683 static void sctp_cmd_transport_on(sctp_cmd_seq_t
*cmds
,
684 struct sctp_association
*asoc
,
685 struct sctp_transport
*t
,
686 struct sctp_chunk
*chunk
)
688 sctp_sender_hb_info_t
*hbinfo
;
689 int was_unconfirmed
= 0;
691 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
692 * HEARTBEAT should clear the error counter of the destination
693 * transport address to which the HEARTBEAT was sent.
698 * Although RFC4960 specifies that the overall error count must
699 * be cleared when a HEARTBEAT ACK is received, we make an
700 * exception while in SHUTDOWN PENDING. If the peer keeps its
701 * window shut forever, we may never be able to transmit our
702 * outstanding data and rely on the retransmission limit be reached
703 * to shutdown the association.
705 if (t
->asoc
->state
< SCTP_STATE_SHUTDOWN_PENDING
)
706 t
->asoc
->overall_error_count
= 0;
708 /* Clear the hb_sent flag to signal that we had a good
713 /* Mark the destination transport address as active if it is not so
716 if ((t
->state
== SCTP_INACTIVE
) || (t
->state
== SCTP_UNCONFIRMED
)) {
718 sctp_assoc_control_transport(asoc
, t
, SCTP_TRANSPORT_UP
,
719 SCTP_HEARTBEAT_SUCCESS
);
722 if (t
->state
== SCTP_PF
)
723 sctp_assoc_control_transport(asoc
, t
, SCTP_TRANSPORT_UP
,
724 SCTP_HEARTBEAT_SUCCESS
);
726 /* HB-ACK was received for a the proper HB. Consider this
732 /* The receiver of the HEARTBEAT ACK should also perform an
733 * RTT measurement for that destination transport address
734 * using the time value carried in the HEARTBEAT ACK chunk.
735 * If the transport's rto_pending variable has been cleared,
736 * it was most likely due to a retransmit. However, we want
737 * to re-enable it to properly update the rto.
739 if (t
->rto_pending
== 0)
742 hbinfo
= (sctp_sender_hb_info_t
*) chunk
->skb
->data
;
743 sctp_transport_update_rto(t
, (jiffies
- hbinfo
->sent_at
));
745 /* Update the heartbeat timer. */
746 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
747 sctp_transport_hold(t
);
749 if (was_unconfirmed
&& asoc
->peer
.transport_count
== 1)
750 sctp_transport_immediate_rtx(t
);
754 /* Helper function to process the process SACK command. */
755 static int sctp_cmd_process_sack(sctp_cmd_seq_t
*cmds
,
756 struct sctp_association
*asoc
,
757 struct sctp_chunk
*chunk
)
761 if (sctp_outq_sack(&asoc
->outqueue
, chunk
)) {
762 struct net
*net
= sock_net(asoc
->base
.sk
);
764 /* There are no more TSNs awaiting SACK. */
765 err
= sctp_do_sm(net
, SCTP_EVENT_T_OTHER
,
766 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN
),
767 asoc
->state
, asoc
->ep
, asoc
, NULL
,
774 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
775 * the transport for a shutdown chunk.
777 static void sctp_cmd_setup_t2(sctp_cmd_seq_t
*cmds
,
778 struct sctp_association
*asoc
,
779 struct sctp_chunk
*chunk
)
781 struct sctp_transport
*t
;
783 if (chunk
->transport
)
784 t
= chunk
->transport
;
786 t
= sctp_assoc_choose_alter_transport(asoc
,
787 asoc
->shutdown_last_sent_to
);
788 chunk
->transport
= t
;
790 asoc
->shutdown_last_sent_to
= t
;
791 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
] = t
->rto
;
794 /* Helper function to change the state of an association. */
795 static void sctp_cmd_new_state(sctp_cmd_seq_t
*cmds
,
796 struct sctp_association
*asoc
,
799 struct sock
*sk
= asoc
->base
.sk
;
803 pr_debug("%s: asoc:%p[%s]\n", __func__
, asoc
, sctp_state_tbl
[state
]);
805 if (sctp_style(sk
, TCP
)) {
806 /* Change the sk->sk_state of a TCP-style socket that has
807 * successfully completed a connect() call.
809 if (sctp_state(asoc
, ESTABLISHED
) && sctp_sstate(sk
, CLOSED
))
810 sk
->sk_state
= SCTP_SS_ESTABLISHED
;
812 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
813 if (sctp_state(asoc
, SHUTDOWN_RECEIVED
) &&
814 sctp_sstate(sk
, ESTABLISHED
))
815 sk
->sk_shutdown
|= RCV_SHUTDOWN
;
818 if (sctp_state(asoc
, COOKIE_WAIT
)) {
819 /* Reset init timeouts since they may have been
820 * increased due to timer expirations.
822 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] =
824 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] =
828 if (sctp_state(asoc
, ESTABLISHED
) ||
829 sctp_state(asoc
, CLOSED
) ||
830 sctp_state(asoc
, SHUTDOWN_RECEIVED
)) {
831 /* Wake up any processes waiting in the asoc's wait queue in
832 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
834 if (waitqueue_active(&asoc
->wait
))
835 wake_up_interruptible(&asoc
->wait
);
837 /* Wake up any processes waiting in the sk's sleep queue of
838 * a TCP-style or UDP-style peeled-off socket in
839 * sctp_wait_for_accept() or sctp_wait_for_packet().
840 * For a UDP-style socket, the waiters are woken up by the
843 if (!sctp_style(sk
, UDP
))
844 sk
->sk_state_change(sk
);
848 /* Helper function to delete an association. */
849 static void sctp_cmd_delete_tcb(sctp_cmd_seq_t
*cmds
,
850 struct sctp_association
*asoc
)
852 struct sock
*sk
= asoc
->base
.sk
;
854 /* If it is a non-temporary association belonging to a TCP-style
855 * listening socket that is not closed, do not free it so that accept()
856 * can pick it up later.
858 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
) &&
859 (!asoc
->temp
) && (sk
->sk_shutdown
!= SHUTDOWN_MASK
))
862 sctp_unhash_established(asoc
);
863 sctp_association_free(asoc
);
867 * ADDIP Section 4.1 ASCONF Chunk Procedures
868 * A4) Start a T-4 RTO timer, using the RTO value of the selected
869 * destination address (we use active path instead of primary path just
870 * because primary path may be inactive.
872 static void sctp_cmd_setup_t4(sctp_cmd_seq_t
*cmds
,
873 struct sctp_association
*asoc
,
874 struct sctp_chunk
*chunk
)
876 struct sctp_transport
*t
;
878 t
= sctp_assoc_choose_alter_transport(asoc
, chunk
->transport
);
879 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T4_RTO
] = t
->rto
;
880 chunk
->transport
= t
;
883 /* Process an incoming Operation Error Chunk. */
884 static void sctp_cmd_process_operr(sctp_cmd_seq_t
*cmds
,
885 struct sctp_association
*asoc
,
886 struct sctp_chunk
*chunk
)
888 struct sctp_errhdr
*err_hdr
;
889 struct sctp_ulpevent
*ev
;
891 while (chunk
->chunk_end
> chunk
->skb
->data
) {
892 err_hdr
= (struct sctp_errhdr
*)(chunk
->skb
->data
);
894 ev
= sctp_ulpevent_make_remote_error(asoc
, chunk
, 0,
899 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
901 switch (err_hdr
->cause
) {
902 case SCTP_ERROR_UNKNOWN_CHUNK
:
904 sctp_chunkhdr_t
*unk_chunk_hdr
;
906 unk_chunk_hdr
= (sctp_chunkhdr_t
*)err_hdr
->variable
;
907 switch (unk_chunk_hdr
->type
) {
908 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with
909 * an ERROR chunk reporting that it did not recognized
910 * the ASCONF chunk type, the sender of the ASCONF MUST
911 * NOT send any further ASCONF chunks and MUST stop its
914 case SCTP_CID_ASCONF
:
915 if (asoc
->peer
.asconf_capable
== 0)
918 asoc
->peer
.asconf_capable
= 0;
919 sctp_add_cmd_sf(cmds
, SCTP_CMD_TIMER_STOP
,
920 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO
));
933 /* Process variable FWDTSN chunk information. */
934 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq
*ulpq
,
935 struct sctp_chunk
*chunk
)
937 struct sctp_fwdtsn_skip
*skip
;
938 /* Walk through all the skipped SSNs */
939 sctp_walk_fwdtsn(skip
, chunk
) {
940 sctp_ulpq_skip(ulpq
, ntohs(skip
->stream
), ntohs(skip
->ssn
));
944 /* Helper function to remove the association non-primary peer
947 static void sctp_cmd_del_non_primary(struct sctp_association
*asoc
)
949 struct sctp_transport
*t
;
950 struct list_head
*pos
;
951 struct list_head
*temp
;
953 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
954 t
= list_entry(pos
, struct sctp_transport
, transports
);
955 if (!sctp_cmp_addr_exact(&t
->ipaddr
,
956 &asoc
->peer
.primary_addr
)) {
957 sctp_assoc_del_peer(asoc
, &t
->ipaddr
);
962 /* Helper function to set sk_err on a 1-1 style socket. */
963 static void sctp_cmd_set_sk_err(struct sctp_association
*asoc
, int error
)
965 struct sock
*sk
= asoc
->base
.sk
;
967 if (!sctp_style(sk
, UDP
))
971 /* Helper function to generate an association change event */
972 static void sctp_cmd_assoc_change(sctp_cmd_seq_t
*commands
,
973 struct sctp_association
*asoc
,
976 struct sctp_ulpevent
*ev
;
978 ev
= sctp_ulpevent_make_assoc_change(asoc
, 0, state
, 0,
979 asoc
->c
.sinit_num_ostreams
,
980 asoc
->c
.sinit_max_instreams
,
983 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
986 /* Helper function to generate an adaptation indication event */
987 static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t
*commands
,
988 struct sctp_association
*asoc
)
990 struct sctp_ulpevent
*ev
;
992 ev
= sctp_ulpevent_make_adaptation_indication(asoc
, GFP_ATOMIC
);
995 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
999 static void sctp_cmd_t1_timer_update(struct sctp_association
*asoc
,
1000 sctp_event_timeout_t timer
,
1003 struct sctp_transport
*t
;
1005 t
= asoc
->init_last_sent_to
;
1006 asoc
->init_err_counter
++;
1008 if (t
->init_sent_count
> (asoc
->init_cycle
+ 1)) {
1009 asoc
->timeouts
[timer
] *= 2;
1010 if (asoc
->timeouts
[timer
] > asoc
->max_init_timeo
) {
1011 asoc
->timeouts
[timer
] = asoc
->max_init_timeo
;
1015 pr_debug("%s: T1[%s] timeout adjustment init_err_counter:%d"
1016 " cycle:%d timeout:%ld\n", __func__
, name
,
1017 asoc
->init_err_counter
, asoc
->init_cycle
,
1018 asoc
->timeouts
[timer
]);
1023 /* Send the whole message, chunk by chunk, to the outqueue.
1024 * This way the whole message is queued up and bundling if
1025 * encouraged for small fragments.
1027 static int sctp_cmd_send_msg(struct sctp_association
*asoc
,
1028 struct sctp_datamsg
*msg
)
1030 struct sctp_chunk
*chunk
;
1033 list_for_each_entry(chunk
, &msg
->chunks
, frag_list
) {
1034 error
= sctp_outq_tail(&asoc
->outqueue
, chunk
);
1043 /* Sent the next ASCONF packet currently stored in the association.
1044 * This happens after the ASCONF_ACK was succeffully processed.
1046 static void sctp_cmd_send_asconf(struct sctp_association
*asoc
)
1048 struct net
*net
= sock_net(asoc
->base
.sk
);
1050 /* Send the next asconf chunk from the addip chunk
1053 if (!list_empty(&asoc
->addip_chunk_list
)) {
1054 struct list_head
*entry
= asoc
->addip_chunk_list
.next
;
1055 struct sctp_chunk
*asconf
= list_entry(entry
,
1056 struct sctp_chunk
, list
);
1057 list_del_init(entry
);
1059 /* Hold the chunk until an ASCONF_ACK is received. */
1060 sctp_chunk_hold(asconf
);
1061 if (sctp_primitive_ASCONF(net
, asoc
, asconf
))
1062 sctp_chunk_free(asconf
);
1064 asoc
->addip_last_asconf
= asconf
;
1069 /* These three macros allow us to pull the debugging code out of the
1070 * main flow of sctp_do_sm() to keep attention focused on the real
1071 * functionality there.
1073 #define debug_pre_sfn() \
1074 pr_debug("%s[pre-fn]: ep:%p, %s, %s, asoc:%p[%s], %s\n", __func__, \
1075 ep, sctp_evttype_tbl[event_type], (*debug_fn)(subtype), \
1076 asoc, sctp_state_tbl[state], state_fn->name)
1078 #define debug_post_sfn() \
1079 pr_debug("%s[post-fn]: asoc:%p, status:%s\n", __func__, asoc, \
1080 sctp_status_tbl[status])
1082 #define debug_post_sfx() \
1083 pr_debug("%s[post-sfx]: error:%d, asoc:%p[%s]\n", __func__, error, \
1084 asoc, sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
1085 sctp_assoc2id(asoc))) ? asoc->state : SCTP_STATE_CLOSED])
1088 * This is the master state machine processing function.
1090 * If you want to understand all of lksctp, this is a
1091 * good place to start.
1093 int sctp_do_sm(struct net
*net
, sctp_event_t event_type
, sctp_subtype_t subtype
,
1095 struct sctp_endpoint
*ep
,
1096 struct sctp_association
*asoc
,
1100 sctp_cmd_seq_t commands
;
1101 const sctp_sm_table_entry_t
*state_fn
;
1102 sctp_disposition_t status
;
1104 typedef const char *(printfn_t
)(sctp_subtype_t
);
1105 static printfn_t
*table
[] = {
1106 NULL
, sctp_cname
, sctp_tname
, sctp_oname
, sctp_pname
,
1108 printfn_t
*debug_fn
__attribute__ ((unused
)) = table
[event_type
];
1110 /* Look up the state function, run it, and then process the
1111 * side effects. These three steps are the heart of lksctp.
1113 state_fn
= sctp_sm_lookup_event(net
, event_type
, state
, subtype
);
1115 sctp_init_cmd_seq(&commands
);
1118 status
= state_fn
->fn(net
, ep
, asoc
, subtype
, event_arg
, &commands
);
1121 error
= sctp_side_effects(event_type
, subtype
, state
,
1122 ep
, asoc
, event_arg
, status
,
1129 /*****************************************************************
1130 * This the master state function side effect processing function.
1131 *****************************************************************/
1132 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
1134 struct sctp_endpoint
*ep
,
1135 struct sctp_association
*asoc
,
1137 sctp_disposition_t status
,
1138 sctp_cmd_seq_t
*commands
,
1143 /* FIXME - Most of the dispositions left today would be categorized
1144 * as "exceptional" dispositions. For those dispositions, it
1145 * may not be proper to run through any of the commands at all.
1146 * For example, the command interpreter might be run only with
1147 * disposition SCTP_DISPOSITION_CONSUME.
1149 if (0 != (error
= sctp_cmd_interpreter(event_type
, subtype
, state
,
1156 case SCTP_DISPOSITION_DISCARD
:
1157 pr_debug("%s: ignored sctp protocol event - state:%d, "
1158 "event_type:%d, event_id:%d\n", __func__
, state
,
1159 event_type
, subtype
.chunk
);
1162 case SCTP_DISPOSITION_NOMEM
:
1163 /* We ran out of memory, so we need to discard this
1166 /* BUG--we should now recover some memory, probably by
1172 case SCTP_DISPOSITION_DELETE_TCB
:
1173 /* This should now be a command. */
1176 case SCTP_DISPOSITION_CONSUME
:
1177 case SCTP_DISPOSITION_ABORT
:
1179 * We should no longer have much work to do here as the
1180 * real work has been done as explicit commands above.
1184 case SCTP_DISPOSITION_VIOLATION
:
1185 net_err_ratelimited("protocol violation state %d chunkid %d\n",
1186 state
, subtype
.chunk
);
1189 case SCTP_DISPOSITION_NOT_IMPL
:
1190 pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n",
1191 state
, event_type
, subtype
.chunk
);
1194 case SCTP_DISPOSITION_BUG
:
1195 pr_err("bug in state %d, event_type %d, event_id %d\n",
1196 state
, event_type
, subtype
.chunk
);
1201 pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n",
1202 status
, state
, event_type
, subtype
.chunk
);
1211 /********************************************************************
1212 * 2nd Level Abstractions
1213 ********************************************************************/
1215 /* This is the side-effect interpreter. */
1216 static int sctp_cmd_interpreter(sctp_event_t event_type
,
1217 sctp_subtype_t subtype
,
1219 struct sctp_endpoint
*ep
,
1220 struct sctp_association
*asoc
,
1222 sctp_disposition_t status
,
1223 sctp_cmd_seq_t
*commands
,
1229 struct sctp_chunk
*new_obj
;
1230 struct sctp_chunk
*chunk
= NULL
;
1231 struct sctp_packet
*packet
;
1232 struct timer_list
*timer
;
1233 unsigned long timeout
;
1234 struct sctp_transport
*t
;
1235 struct sctp_sackhdr sackh
;
1238 if (SCTP_EVENT_T_TIMEOUT
!= event_type
)
1241 /* Note: This whole file is a huge candidate for rework.
1242 * For example, each command could either have its own handler, so
1243 * the loop would look like:
1245 * cmd->handle(x, y, z)
1248 while (NULL
!= (cmd
= sctp_next_cmd(commands
))) {
1249 switch (cmd
->verb
) {
1254 case SCTP_CMD_NEW_ASOC
:
1255 /* Register a new association. */
1257 sctp_outq_uncork(&asoc
->outqueue
);
1261 /* Register with the endpoint. */
1262 asoc
= cmd
->obj
.asoc
;
1263 BUG_ON(asoc
->peer
.primary_path
== NULL
);
1264 sctp_endpoint_add_asoc(ep
, asoc
);
1265 sctp_hash_established(asoc
);
1268 case SCTP_CMD_UPDATE_ASSOC
:
1269 sctp_assoc_update(asoc
, cmd
->obj
.asoc
);
1272 case SCTP_CMD_PURGE_OUTQUEUE
:
1273 sctp_outq_teardown(&asoc
->outqueue
);
1276 case SCTP_CMD_DELETE_TCB
:
1278 sctp_outq_uncork(&asoc
->outqueue
);
1281 /* Delete the current association. */
1282 sctp_cmd_delete_tcb(commands
, asoc
);
1286 case SCTP_CMD_NEW_STATE
:
1287 /* Enter a new state. */
1288 sctp_cmd_new_state(commands
, asoc
, cmd
->obj
.state
);
1291 case SCTP_CMD_REPORT_TSN
:
1292 /* Record the arrival of a TSN. */
1293 error
= sctp_tsnmap_mark(&asoc
->peer
.tsn_map
,
1294 cmd
->obj
.u32
, NULL
);
1297 case SCTP_CMD_REPORT_FWDTSN
:
1298 /* Move the Cumulattive TSN Ack ahead. */
1299 sctp_tsnmap_skip(&asoc
->peer
.tsn_map
, cmd
->obj
.u32
);
1301 /* purge the fragmentation queue */
1302 sctp_ulpq_reasm_flushtsn(&asoc
->ulpq
, cmd
->obj
.u32
);
1304 /* Abort any in progress partial delivery. */
1305 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
1308 case SCTP_CMD_PROCESS_FWDTSN
:
1309 sctp_cmd_process_fwdtsn(&asoc
->ulpq
, cmd
->obj
.chunk
);
1312 case SCTP_CMD_GEN_SACK
:
1313 /* Generate a Selective ACK.
1314 * The argument tells us whether to just count
1315 * the packet and MAYBE generate a SACK, or
1318 force
= cmd
->obj
.i32
;
1319 error
= sctp_gen_sack(asoc
, force
, commands
);
1322 case SCTP_CMD_PROCESS_SACK
:
1323 /* Process an inbound SACK. */
1324 error
= sctp_cmd_process_sack(commands
, asoc
,
1328 case SCTP_CMD_GEN_INIT_ACK
:
1329 /* Generate an INIT ACK chunk. */
1330 new_obj
= sctp_make_init_ack(asoc
, chunk
, GFP_ATOMIC
,
1335 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1336 SCTP_CHUNK(new_obj
));
1339 case SCTP_CMD_PEER_INIT
:
1340 /* Process a unified INIT from the peer.
1341 * Note: Only used during INIT-ACK processing. If
1342 * there is an error just return to the outter
1343 * layer which will bail.
1345 error
= sctp_cmd_process_init(commands
, asoc
, chunk
,
1346 cmd
->obj
.init
, gfp
);
1349 case SCTP_CMD_GEN_COOKIE_ECHO
:
1350 /* Generate a COOKIE ECHO chunk. */
1351 new_obj
= sctp_make_cookie_echo(asoc
, chunk
);
1354 sctp_chunk_free(cmd
->obj
.chunk
);
1357 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1358 SCTP_CHUNK(new_obj
));
1360 /* If there is an ERROR chunk to be sent along with
1361 * the COOKIE_ECHO, send it, too.
1364 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1365 SCTP_CHUNK(cmd
->obj
.chunk
));
1367 if (new_obj
->transport
) {
1368 new_obj
->transport
->init_sent_count
++;
1369 asoc
->init_last_sent_to
= new_obj
->transport
;
1372 /* FIXME - Eventually come up with a cleaner way to
1373 * enabling COOKIE-ECHO + DATA bundling during
1374 * multihoming stale cookie scenarios, the following
1375 * command plays with asoc->peer.retran_path to
1376 * avoid the problem of sending the COOKIE-ECHO and
1377 * DATA in different paths, which could result
1378 * in the association being ABORTed if the DATA chunk
1379 * is processed first by the server. Checking the
1380 * init error counter simply causes this command
1381 * to be executed only during failed attempts of
1382 * association establishment.
1384 if ((asoc
->peer
.retran_path
!=
1385 asoc
->peer
.primary_path
) &&
1386 (asoc
->init_err_counter
> 0)) {
1387 sctp_add_cmd_sf(commands
,
1388 SCTP_CMD_FORCE_PRIM_RETRAN
,
1394 case SCTP_CMD_GEN_SHUTDOWN
:
1395 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1396 * Reset error counts.
1398 asoc
->overall_error_count
= 0;
1400 /* Generate a SHUTDOWN chunk. */
1401 new_obj
= sctp_make_shutdown(asoc
, chunk
);
1404 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1405 SCTP_CHUNK(new_obj
));
1408 case SCTP_CMD_CHUNK_ULP
:
1409 /* Send a chunk to the sockets layer. */
1410 pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n",
1411 __func__
, cmd
->obj
.chunk
, &asoc
->ulpq
);
1413 sctp_ulpq_tail_data(&asoc
->ulpq
, cmd
->obj
.chunk
,
1417 case SCTP_CMD_EVENT_ULP
:
1418 /* Send a notification to the sockets layer. */
1419 pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n",
1420 __func__
, cmd
->obj
.ulpevent
, &asoc
->ulpq
);
1422 sctp_ulpq_tail_event(&asoc
->ulpq
, cmd
->obj
.ulpevent
);
1425 case SCTP_CMD_REPLY
:
1426 /* If an caller has not already corked, do cork. */
1427 if (!asoc
->outqueue
.cork
) {
1428 sctp_outq_cork(&asoc
->outqueue
);
1431 /* Send a chunk to our peer. */
1432 error
= sctp_outq_tail(&asoc
->outqueue
, cmd
->obj
.chunk
);
1435 case SCTP_CMD_SEND_PKT
:
1436 /* Send a full packet to our peer. */
1437 packet
= cmd
->obj
.packet
;
1438 sctp_packet_transmit(packet
);
1439 sctp_ootb_pkt_free(packet
);
1442 case SCTP_CMD_T1_RETRAN
:
1443 /* Mark a transport for retransmission. */
1444 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1448 case SCTP_CMD_RETRAN
:
1449 /* Mark a transport for retransmission. */
1450 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1454 case SCTP_CMD_ECN_CE
:
1455 /* Do delayed CE processing. */
1456 sctp_do_ecn_ce_work(asoc
, cmd
->obj
.u32
);
1459 case SCTP_CMD_ECN_ECNE
:
1460 /* Do delayed ECNE processing. */
1461 new_obj
= sctp_do_ecn_ecne_work(asoc
, cmd
->obj
.u32
,
1464 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1465 SCTP_CHUNK(new_obj
));
1468 case SCTP_CMD_ECN_CWR
:
1469 /* Do delayed CWR processing. */
1470 sctp_do_ecn_cwr_work(asoc
, cmd
->obj
.u32
);
1473 case SCTP_CMD_SETUP_T2
:
1474 sctp_cmd_setup_t2(commands
, asoc
, cmd
->obj
.chunk
);
1477 case SCTP_CMD_TIMER_START_ONCE
:
1478 timer
= &asoc
->timers
[cmd
->obj
.to
];
1480 if (timer_pending(timer
))
1484 case SCTP_CMD_TIMER_START
:
1485 timer
= &asoc
->timers
[cmd
->obj
.to
];
1486 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1489 timer
->expires
= jiffies
+ timeout
;
1490 sctp_association_hold(asoc
);
1494 case SCTP_CMD_TIMER_RESTART
:
1495 timer
= &asoc
->timers
[cmd
->obj
.to
];
1496 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1497 if (!mod_timer(timer
, jiffies
+ timeout
))
1498 sctp_association_hold(asoc
);
1501 case SCTP_CMD_TIMER_STOP
:
1502 timer
= &asoc
->timers
[cmd
->obj
.to
];
1503 if (del_timer(timer
))
1504 sctp_association_put(asoc
);
1507 case SCTP_CMD_INIT_CHOOSE_TRANSPORT
:
1508 chunk
= cmd
->obj
.chunk
;
1509 t
= sctp_assoc_choose_alter_transport(asoc
,
1510 asoc
->init_last_sent_to
);
1511 asoc
->init_last_sent_to
= t
;
1512 chunk
->transport
= t
;
1513 t
->init_sent_count
++;
1514 /* Set the new transport as primary */
1515 sctp_assoc_set_primary(asoc
, t
);
1518 case SCTP_CMD_INIT_RESTART
:
1519 /* Do the needed accounting and updates
1520 * associated with restarting an initialization
1521 * timer. Only multiply the timeout by two if
1522 * all transports have been tried at the current
1525 sctp_cmd_t1_timer_update(asoc
,
1526 SCTP_EVENT_TIMEOUT_T1_INIT
,
1529 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
1530 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT
));
1533 case SCTP_CMD_COOKIEECHO_RESTART
:
1534 /* Do the needed accounting and updates
1535 * associated with restarting an initialization
1536 * timer. Only multiply the timeout by two if
1537 * all transports have been tried at the current
1540 sctp_cmd_t1_timer_update(asoc
,
1541 SCTP_EVENT_TIMEOUT_T1_COOKIE
,
1544 /* If we've sent any data bundled with
1545 * COOKIE-ECHO we need to resend.
1547 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
1549 sctp_retransmit_mark(&asoc
->outqueue
, t
,
1553 sctp_add_cmd_sf(commands
,
1554 SCTP_CMD_TIMER_RESTART
,
1555 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE
));
1558 case SCTP_CMD_INIT_FAILED
:
1559 sctp_cmd_init_failed(commands
, asoc
, cmd
->obj
.err
);
1562 case SCTP_CMD_ASSOC_FAILED
:
1563 sctp_cmd_assoc_failed(commands
, asoc
, event_type
,
1564 subtype
, chunk
, cmd
->obj
.err
);
1567 case SCTP_CMD_INIT_COUNTER_INC
:
1568 asoc
->init_err_counter
++;
1571 case SCTP_CMD_INIT_COUNTER_RESET
:
1572 asoc
->init_err_counter
= 0;
1573 asoc
->init_cycle
= 0;
1574 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
1576 t
->init_sent_count
= 0;
1580 case SCTP_CMD_REPORT_DUP
:
1581 sctp_tsnmap_mark_dup(&asoc
->peer
.tsn_map
,
1585 case SCTP_CMD_REPORT_BAD_TAG
:
1586 pr_debug("%s: vtag mismatch!\n", __func__
);
1589 case SCTP_CMD_STRIKE
:
1590 /* Mark one strike against a transport. */
1591 sctp_do_8_2_transport_strike(commands
, asoc
,
1592 cmd
->obj
.transport
, 0);
1595 case SCTP_CMD_TRANSPORT_IDLE
:
1596 t
= cmd
->obj
.transport
;
1597 sctp_transport_lower_cwnd(t
, SCTP_LOWER_CWND_INACTIVE
);
1600 case SCTP_CMD_TRANSPORT_HB_SENT
:
1601 t
= cmd
->obj
.transport
;
1602 sctp_do_8_2_transport_strike(commands
, asoc
,
1607 case SCTP_CMD_TRANSPORT_ON
:
1608 t
= cmd
->obj
.transport
;
1609 sctp_cmd_transport_on(commands
, asoc
, t
, chunk
);
1612 case SCTP_CMD_HB_TIMERS_START
:
1613 sctp_cmd_hb_timers_start(commands
, asoc
);
1616 case SCTP_CMD_HB_TIMER_UPDATE
:
1617 t
= cmd
->obj
.transport
;
1618 sctp_cmd_hb_timer_update(commands
, t
);
1621 case SCTP_CMD_HB_TIMERS_STOP
:
1622 sctp_cmd_hb_timers_stop(commands
, asoc
);
1625 case SCTP_CMD_REPORT_ERROR
:
1626 error
= cmd
->obj
.error
;
1629 case SCTP_CMD_PROCESS_CTSN
:
1630 /* Dummy up a SACK for processing. */
1631 sackh
.cum_tsn_ack
= cmd
->obj
.be32
;
1632 sackh
.a_rwnd
= asoc
->peer
.rwnd
+
1633 asoc
->outqueue
.outstanding_bytes
;
1634 sackh
.num_gap_ack_blocks
= 0;
1635 sackh
.num_dup_tsns
= 0;
1636 chunk
->subh
.sack_hdr
= &sackh
;
1637 sctp_add_cmd_sf(commands
, SCTP_CMD_PROCESS_SACK
,
1641 case SCTP_CMD_DISCARD_PACKET
:
1642 /* We need to discard the whole packet.
1643 * Uncork the queue since there might be
1646 chunk
->pdiscard
= 1;
1648 sctp_outq_uncork(&asoc
->outqueue
);
1653 case SCTP_CMD_RTO_PENDING
:
1654 t
= cmd
->obj
.transport
;
1658 case SCTP_CMD_PART_DELIVER
:
1659 sctp_ulpq_partial_delivery(&asoc
->ulpq
, GFP_ATOMIC
);
1662 case SCTP_CMD_RENEGE
:
1663 sctp_ulpq_renege(&asoc
->ulpq
, cmd
->obj
.chunk
,
1667 case SCTP_CMD_SETUP_T4
:
1668 sctp_cmd_setup_t4(commands
, asoc
, cmd
->obj
.chunk
);
1671 case SCTP_CMD_PROCESS_OPERR
:
1672 sctp_cmd_process_operr(commands
, asoc
, chunk
);
1674 case SCTP_CMD_CLEAR_INIT_TAG
:
1675 asoc
->peer
.i
.init_tag
= 0;
1677 case SCTP_CMD_DEL_NON_PRIMARY
:
1678 sctp_cmd_del_non_primary(asoc
);
1680 case SCTP_CMD_T3_RTX_TIMERS_STOP
:
1681 sctp_cmd_t3_rtx_timers_stop(commands
, asoc
);
1683 case SCTP_CMD_FORCE_PRIM_RETRAN
:
1684 t
= asoc
->peer
.retran_path
;
1685 asoc
->peer
.retran_path
= asoc
->peer
.primary_path
;
1686 error
= sctp_outq_uncork(&asoc
->outqueue
);
1688 asoc
->peer
.retran_path
= t
;
1690 case SCTP_CMD_SET_SK_ERR
:
1691 sctp_cmd_set_sk_err(asoc
, cmd
->obj
.error
);
1693 case SCTP_CMD_ASSOC_CHANGE
:
1694 sctp_cmd_assoc_change(commands
, asoc
,
1697 case SCTP_CMD_ADAPTATION_IND
:
1698 sctp_cmd_adaptation_ind(commands
, asoc
);
1701 case SCTP_CMD_ASSOC_SHKEY
:
1702 error
= sctp_auth_asoc_init_active_key(asoc
,
1705 case SCTP_CMD_UPDATE_INITTAG
:
1706 asoc
->peer
.i
.init_tag
= cmd
->obj
.u32
;
1708 case SCTP_CMD_SEND_MSG
:
1709 if (!asoc
->outqueue
.cork
) {
1710 sctp_outq_cork(&asoc
->outqueue
);
1713 error
= sctp_cmd_send_msg(asoc
, cmd
->obj
.msg
);
1715 case SCTP_CMD_SEND_NEXT_ASCONF
:
1716 sctp_cmd_send_asconf(asoc
);
1718 case SCTP_CMD_PURGE_ASCONF_QUEUE
:
1719 sctp_asconf_queue_teardown(asoc
);
1722 case SCTP_CMD_SET_ASOC
:
1723 asoc
= cmd
->obj
.asoc
;
1727 pr_warn("Impossible command: %u\n",
1737 /* If this is in response to a received chunk, wait until
1738 * we are done with the packet to open the queue so that we don't
1739 * send multiple packets in response to a single request.
1741 if (asoc
&& SCTP_EVENT_T_CHUNK
== event_type
&& chunk
) {
1742 if (chunk
->end_of_packet
|| chunk
->singleton
)
1743 error
= sctp_outq_uncork(&asoc
->outqueue
);
1744 } else if (local_cork
)
1745 error
= sctp_outq_uncork(&asoc
->outqueue
);