1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
6 * This file is part of the SCTP kernel implementation
8 * These functions work with the state functions in sctp_sm_statefuns.c
9 * to implement that state operations. These functions implement the
10 * steps which require modifying existing data structures.
12 * This SCTP implementation is free software;
13 * you can redistribute it and/or modify it under the terms of
14 * the GNU General Public License as published by
15 * the Free Software Foundation; either version 2, or (at your option)
18 * This SCTP implementation is distributed in the hope that it
19 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
20 * ************************
21 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
22 * See the GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with GNU CC; see the file COPYING. If not, write to
26 * the Free Software Foundation, 59 Temple Place - Suite 330,
27 * Boston, MA 02111-1307, USA.
29 * Please send any bug reports or fixes you make to the
31 * lksctp developers <lksctp-developers@lists.sourceforge.net>
33 * Or submit a bug report through the following website:
34 * http://www.sf.net/projects/lksctp
36 * Written or modified by:
37 * La Monte H.P. Yarroll <piggy@acm.org>
38 * Karl Knutson <karl@athena.chicago.il.us>
39 * Jon Grimm <jgrimm@austin.ibm.com>
40 * Hui Huang <hui.huang@nokia.com>
41 * Dajiang Zhang <dajiang.zhang@nokia.com>
42 * Daisy Chang <daisyc@us.ibm.com>
43 * Sridhar Samudrala <sri@us.ibm.com>
44 * Ardelle Fan <ardelle.fan@intel.com>
46 * Any bugs reported given to us we will try to fix... any fixes shared will
47 * be incorporated into the next SCTP release.
50 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
52 #include <linux/skbuff.h>
53 #include <linux/types.h>
54 #include <linux/socket.h>
56 #include <linux/gfp.h>
58 #include <net/sctp/sctp.h>
59 #include <net/sctp/sm.h>
61 static int sctp_cmd_interpreter(sctp_event_t event_type
,
62 sctp_subtype_t subtype
,
64 struct sctp_endpoint
*ep
,
65 struct sctp_association
*asoc
,
67 sctp_disposition_t status
,
68 sctp_cmd_seq_t
*commands
,
70 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
72 struct sctp_endpoint
*ep
,
73 struct sctp_association
*asoc
,
75 sctp_disposition_t status
,
76 sctp_cmd_seq_t
*commands
,
79 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t
*cmds
,
80 struct sctp_transport
*t
);
81 /********************************************************************
83 ********************************************************************/
85 /* A helper function for delayed processing of INET ECN CE bit. */
86 static void sctp_do_ecn_ce_work(struct sctp_association
*asoc
,
89 /* Save the TSN away for comparison when we receive CWR */
91 asoc
->last_ecne_tsn
= lowest_tsn
;
95 /* Helper function for delayed processing of SCTP ECNE chunk. */
96 /* RFC 2960 Appendix A
98 * RFC 2481 details a specific bit for a sender to send in
99 * the header of its next outbound TCP segment to indicate to
100 * its peer that it has reduced its congestion window. This
101 * is termed the CWR bit. For SCTP the same indication is made
102 * by including the CWR chunk. This chunk contains one data
103 * element, i.e. the TSN number that was sent in the ECNE chunk.
104 * This element represents the lowest TSN number in the datagram
105 * that was originally marked with the CE bit.
107 static struct sctp_chunk
*sctp_do_ecn_ecne_work(struct sctp_association
*asoc
,
109 struct sctp_chunk
*chunk
)
111 struct sctp_chunk
*repl
;
113 /* Our previously transmitted packet ran into some congestion
114 * so we should take action by reducing cwnd and ssthresh
115 * and then ACK our peer that we we've done so by
119 /* First, try to determine if we want to actually lower
120 * our cwnd variables. Only lower them if the ECNE looks more
121 * recent than the last response.
123 if (TSN_lt(asoc
->last_cwr_tsn
, lowest_tsn
)) {
124 struct sctp_transport
*transport
;
126 /* Find which transport's congestion variables
127 * need to be adjusted.
129 transport
= sctp_assoc_lookup_tsn(asoc
, lowest_tsn
);
131 /* Update the congestion variables. */
133 sctp_transport_lower_cwnd(transport
,
134 SCTP_LOWER_CWND_ECNE
);
135 asoc
->last_cwr_tsn
= lowest_tsn
;
138 /* Always try to quiet the other end. In case of lost CWR,
139 * resend last_cwr_tsn.
141 repl
= sctp_make_cwr(asoc
, asoc
->last_cwr_tsn
, chunk
);
143 /* If we run out of memory, it will look like a lost CWR. We'll
144 * get back in sync eventually.
149 /* Helper function to do delayed processing of ECN CWR chunk. */
150 static void sctp_do_ecn_cwr_work(struct sctp_association
*asoc
,
153 /* Turn off ECNE getting auto-prepended to every outgoing
159 /* Generate SACK if necessary. We call this at the end of a packet. */
160 static int sctp_gen_sack(struct sctp_association
*asoc
, int force
,
161 sctp_cmd_seq_t
*commands
)
163 __u32 ctsn
, max_tsn_seen
;
164 struct sctp_chunk
*sack
;
165 struct sctp_transport
*trans
= asoc
->peer
.last_data_from
;
169 (!trans
&& (asoc
->param_flags
& SPP_SACKDELAY_DISABLE
)) ||
170 (trans
&& (trans
->param_flags
& SPP_SACKDELAY_DISABLE
)))
171 asoc
->peer
.sack_needed
= 1;
173 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
174 max_tsn_seen
= sctp_tsnmap_get_max_tsn_seen(&asoc
->peer
.tsn_map
);
176 /* From 12.2 Parameters necessary per association (i.e. the TCB):
178 * Ack State : This flag indicates if the next received packet
179 * : is to be responded to with a SACK. ...
180 * : When DATA chunks are out of order, SACK's
181 * : are not delayed (see Section 6).
183 * [This is actually not mentioned in Section 6, but we
184 * implement it here anyway. --piggy]
186 if (max_tsn_seen
!= ctsn
)
187 asoc
->peer
.sack_needed
= 1;
189 /* From 6.2 Acknowledgement on Reception of DATA Chunks:
191 * Section 4.2 of [RFC2581] SHOULD be followed. Specifically,
192 * an acknowledgement SHOULD be generated for at least every
193 * second packet (not every second DATA chunk) received, and
194 * SHOULD be generated within 200 ms of the arrival of any
195 * unacknowledged DATA chunk. ...
197 if (!asoc
->peer
.sack_needed
) {
198 asoc
->peer
.sack_cnt
++;
200 /* Set the SACK delay timeout based on the
201 * SACK delay for the last transport
202 * data was received from, or the default
203 * for the association.
206 /* We will need a SACK for the next packet. */
207 if (asoc
->peer
.sack_cnt
>= trans
->sackfreq
- 1)
208 asoc
->peer
.sack_needed
= 1;
210 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
213 /* We will need a SACK for the next packet. */
214 if (asoc
->peer
.sack_cnt
>= asoc
->sackfreq
- 1)
215 asoc
->peer
.sack_needed
= 1;
217 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
221 /* Restart the SACK timer. */
222 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
223 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
225 asoc
->a_rwnd
= asoc
->rwnd
;
226 sack
= sctp_make_sack(asoc
);
230 asoc
->peer
.sack_needed
= 0;
231 asoc
->peer
.sack_cnt
= 0;
233 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
, SCTP_CHUNK(sack
));
235 /* Stop the SACK timer. */
236 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_STOP
,
237 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
246 /* When the T3-RTX timer expires, it calls this function to create the
247 * relevant state machine event.
249 void sctp_generate_t3_rtx_event(unsigned long peer
)
252 struct sctp_transport
*transport
= (struct sctp_transport
*) peer
;
253 struct sctp_association
*asoc
= transport
->asoc
;
254 struct net
*net
= sock_net(asoc
->base
.sk
);
256 /* Check whether a task is in the sock. */
258 sctp_bh_lock_sock(asoc
->base
.sk
);
259 if (sock_owned_by_user(asoc
->base
.sk
)) {
260 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__
);
262 /* Try again later. */
263 if (!mod_timer(&transport
->T3_rtx_timer
, jiffies
+ (HZ
/20)))
264 sctp_transport_hold(transport
);
268 /* Is this transport really dead and just waiting around for
269 * the timer to let go of the reference?
274 /* Run through the state machine. */
275 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
276 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX
),
279 transport
, GFP_ATOMIC
);
282 asoc
->base
.sk
->sk_err
= -error
;
285 sctp_bh_unlock_sock(asoc
->base
.sk
);
286 sctp_transport_put(transport
);
289 /* This is a sa interface for producing timeout events. It works
290 * for timeouts which use the association as their parameter.
292 static void sctp_generate_timeout_event(struct sctp_association
*asoc
,
293 sctp_event_timeout_t timeout_type
)
295 struct net
*net
= sock_net(asoc
->base
.sk
);
298 sctp_bh_lock_sock(asoc
->base
.sk
);
299 if (sock_owned_by_user(asoc
->base
.sk
)) {
300 SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n",
304 /* Try again later. */
305 if (!mod_timer(&asoc
->timers
[timeout_type
], jiffies
+ (HZ
/20)))
306 sctp_association_hold(asoc
);
310 /* Is this association really dead and just waiting around for
311 * the timer to let go of the reference?
316 /* Run through the state machine. */
317 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
318 SCTP_ST_TIMEOUT(timeout_type
),
319 asoc
->state
, asoc
->ep
, asoc
,
320 (void *)timeout_type
, GFP_ATOMIC
);
323 asoc
->base
.sk
->sk_err
= -error
;
326 sctp_bh_unlock_sock(asoc
->base
.sk
);
327 sctp_association_put(asoc
);
330 static void sctp_generate_t1_cookie_event(unsigned long data
)
332 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
333 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_COOKIE
);
336 static void sctp_generate_t1_init_event(unsigned long data
)
338 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
339 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_INIT
);
342 static void sctp_generate_t2_shutdown_event(unsigned long data
)
344 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
345 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
);
348 static void sctp_generate_t4_rto_event(unsigned long data
)
350 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
351 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T4_RTO
);
354 static void sctp_generate_t5_shutdown_guard_event(unsigned long data
)
356 struct sctp_association
*asoc
= (struct sctp_association
*)data
;
357 sctp_generate_timeout_event(asoc
,
358 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD
);
360 } /* sctp_generate_t5_shutdown_guard_event() */
362 static void sctp_generate_autoclose_event(unsigned long data
)
364 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
365 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_AUTOCLOSE
);
368 /* Generate a heart beat event. If the sock is busy, reschedule. Make
369 * sure that the transport is still valid.
371 void sctp_generate_heartbeat_event(unsigned long data
)
374 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
375 struct sctp_association
*asoc
= transport
->asoc
;
376 struct net
*net
= sock_net(asoc
->base
.sk
);
378 sctp_bh_lock_sock(asoc
->base
.sk
);
379 if (sock_owned_by_user(asoc
->base
.sk
)) {
380 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__
);
382 /* Try again later. */
383 if (!mod_timer(&transport
->hb_timer
, jiffies
+ (HZ
/20)))
384 sctp_transport_hold(transport
);
388 /* Is this structure just waiting around for us to actually
394 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
395 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT
),
396 asoc
->state
, asoc
->ep
, asoc
,
397 transport
, GFP_ATOMIC
);
400 asoc
->base
.sk
->sk_err
= -error
;
403 sctp_bh_unlock_sock(asoc
->base
.sk
);
404 sctp_transport_put(transport
);
407 /* Handle the timeout of the ICMP protocol unreachable timer. Trigger
408 * the correct state machine transition that will close the association.
410 void sctp_generate_proto_unreach_event(unsigned long data
)
412 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
413 struct sctp_association
*asoc
= transport
->asoc
;
414 struct net
*net
= sock_net(asoc
->base
.sk
);
416 sctp_bh_lock_sock(asoc
->base
.sk
);
417 if (sock_owned_by_user(asoc
->base
.sk
)) {
418 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__
);
420 /* Try again later. */
421 if (!mod_timer(&transport
->proto_unreach_timer
,
423 sctp_association_hold(asoc
);
427 /* Is this structure just waiting around for us to actually
433 sctp_do_sm(net
, SCTP_EVENT_T_OTHER
,
434 SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH
),
435 asoc
->state
, asoc
->ep
, asoc
, transport
, GFP_ATOMIC
);
438 sctp_bh_unlock_sock(asoc
->base
.sk
);
439 sctp_association_put(asoc
);
443 /* Inject a SACK Timeout event into the state machine. */
444 static void sctp_generate_sack_event(unsigned long data
)
446 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
447 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_SACK
);
450 sctp_timer_event_t
*sctp_timer_events
[SCTP_NUM_TIMEOUT_TYPES
] = {
452 sctp_generate_t1_cookie_event
,
453 sctp_generate_t1_init_event
,
454 sctp_generate_t2_shutdown_event
,
456 sctp_generate_t4_rto_event
,
457 sctp_generate_t5_shutdown_guard_event
,
459 sctp_generate_sack_event
,
460 sctp_generate_autoclose_event
,
464 /* RFC 2960 8.2 Path Failure Detection
466 * When its peer endpoint is multi-homed, an endpoint should keep a
467 * error counter for each of the destination transport addresses of the
470 * Each time the T3-rtx timer expires on any address, or when a
471 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
472 * the error counter of that destination address will be incremented.
473 * When the value in the error counter exceeds the protocol parameter
474 * 'Path.Max.Retrans' of that destination address, the endpoint should
475 * mark the destination transport address as inactive, and a
476 * notification SHOULD be sent to the upper layer.
479 static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t
*commands
,
480 struct sctp_association
*asoc
,
481 struct sctp_transport
*transport
,
484 /* The check for association's overall error counter exceeding the
485 * threshold is done in the state function.
487 /* We are here due to a timer expiration. If the timer was
488 * not a HEARTBEAT, then normal error tracking is done.
489 * If the timer was a heartbeat, we only increment error counts
490 * when we already have an outstanding HEARTBEAT that has not
492 * Additionally, some tranport states inhibit error increments.
495 asoc
->overall_error_count
++;
496 if (transport
->state
!= SCTP_INACTIVE
)
497 transport
->error_count
++;
498 } else if (transport
->hb_sent
) {
499 if (transport
->state
!= SCTP_UNCONFIRMED
)
500 asoc
->overall_error_count
++;
501 if (transport
->state
!= SCTP_INACTIVE
)
502 transport
->error_count
++;
505 /* If the transport error count is greater than the pf_retrans
506 * threshold, and less than pathmaxrtx, then mark this transport
507 * as Partially Failed, ee SCTP Quick Failover Draft, secon 5.1,
510 if ((transport
->state
!= SCTP_PF
) &&
511 (asoc
->pf_retrans
< transport
->pathmaxrxt
) &&
512 (transport
->error_count
> asoc
->pf_retrans
)) {
514 sctp_assoc_control_transport(asoc
, transport
,
518 /* Update the hb timer to resend a heartbeat every rto */
519 sctp_cmd_hb_timer_update(commands
, transport
);
522 if (transport
->state
!= SCTP_INACTIVE
&&
523 (transport
->error_count
> transport
->pathmaxrxt
)) {
524 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
525 " transport IP: port:%d failed.\n",
527 (&transport
->ipaddr
),
528 ntohs(transport
->ipaddr
.v4
.sin_port
));
529 sctp_assoc_control_transport(asoc
, transport
,
531 SCTP_FAILED_THRESHOLD
);
534 /* E2) For the destination address for which the timer
535 * expires, set RTO <- RTO * 2 ("back off the timer"). The
536 * maximum value discussed in rule C7 above (RTO.max) may be
537 * used to provide an upper bound to this doubling operation.
539 * Special Case: the first HB doesn't trigger exponential backoff.
540 * The first unacknowledged HB triggers it. We do this with a flag
541 * that indicates that we have an outstanding HB.
543 if (!is_hb
|| transport
->hb_sent
) {
544 transport
->rto
= min((transport
->rto
* 2), transport
->asoc
->rto_max
);
548 /* Worker routine to handle INIT command failure. */
549 static void sctp_cmd_init_failed(sctp_cmd_seq_t
*commands
,
550 struct sctp_association
*asoc
,
553 struct sctp_ulpevent
*event
;
555 event
= sctp_ulpevent_make_assoc_change(asoc
,0, SCTP_CANT_STR_ASSOC
,
556 (__u16
)error
, 0, 0, NULL
,
560 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
561 SCTP_ULPEVENT(event
));
563 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
564 SCTP_STATE(SCTP_STATE_CLOSED
));
566 /* SEND_FAILED sent later when cleaning up the association. */
567 asoc
->outqueue
.error
= error
;
568 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
571 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
572 static void sctp_cmd_assoc_failed(sctp_cmd_seq_t
*commands
,
573 struct sctp_association
*asoc
,
574 sctp_event_t event_type
,
575 sctp_subtype_t subtype
,
576 struct sctp_chunk
*chunk
,
579 struct sctp_ulpevent
*event
;
581 /* Cancel any partial delivery in progress. */
582 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
584 if (event_type
== SCTP_EVENT_T_CHUNK
&& subtype
.chunk
== SCTP_CID_ABORT
)
585 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
586 (__u16
)error
, 0, 0, chunk
,
589 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
590 (__u16
)error
, 0, 0, NULL
,
593 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
594 SCTP_ULPEVENT(event
));
596 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
597 SCTP_STATE(SCTP_STATE_CLOSED
));
599 /* SEND_FAILED sent later when cleaning up the association. */
600 asoc
->outqueue
.error
= error
;
601 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
604 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
605 * inside the cookie. In reality, this is only used for INIT-ACK processing
606 * since all other cases use "temporary" associations and can do all
607 * their work in statefuns directly.
609 static int sctp_cmd_process_init(sctp_cmd_seq_t
*commands
,
610 struct sctp_association
*asoc
,
611 struct sctp_chunk
*chunk
,
612 sctp_init_chunk_t
*peer_init
,
617 /* We only process the init as a sideeffect in a single
618 * case. This is when we process the INIT-ACK. If we
619 * fail during INIT processing (due to malloc problems),
620 * just return the error and stop processing the stack.
622 if (!sctp_process_init(asoc
, chunk
, sctp_source(chunk
), peer_init
, gfp
))
630 /* Helper function to break out starting up of heartbeat timers. */
631 static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t
*cmds
,
632 struct sctp_association
*asoc
)
634 struct sctp_transport
*t
;
636 /* Start a heartbeat timer for each transport on the association.
637 * hold a reference on the transport to make sure none of
638 * the needed data structures go away.
640 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
, transports
) {
642 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
643 sctp_transport_hold(t
);
647 static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t
*cmds
,
648 struct sctp_association
*asoc
)
650 struct sctp_transport
*t
;
652 /* Stop all heartbeat timers. */
654 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
656 if (del_timer(&t
->hb_timer
))
657 sctp_transport_put(t
);
661 /* Helper function to stop any pending T3-RTX timers */
662 static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t
*cmds
,
663 struct sctp_association
*asoc
)
665 struct sctp_transport
*t
;
667 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
669 if (timer_pending(&t
->T3_rtx_timer
) &&
670 del_timer(&t
->T3_rtx_timer
)) {
671 sctp_transport_put(t
);
677 /* Helper function to update the heartbeat timer. */
678 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t
*cmds
,
679 struct sctp_transport
*t
)
681 /* Update the heartbeat timer. */
682 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
683 sctp_transport_hold(t
);
686 /* Helper function to handle the reception of an HEARTBEAT ACK. */
687 static void sctp_cmd_transport_on(sctp_cmd_seq_t
*cmds
,
688 struct sctp_association
*asoc
,
689 struct sctp_transport
*t
,
690 struct sctp_chunk
*chunk
)
692 sctp_sender_hb_info_t
*hbinfo
;
693 int was_unconfirmed
= 0;
695 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
696 * HEARTBEAT should clear the error counter of the destination
697 * transport address to which the HEARTBEAT was sent.
702 * Although RFC4960 specifies that the overall error count must
703 * be cleared when a HEARTBEAT ACK is received, we make an
704 * exception while in SHUTDOWN PENDING. If the peer keeps its
705 * window shut forever, we may never be able to transmit our
706 * outstanding data and rely on the retransmission limit be reached
707 * to shutdown the association.
709 if (t
->asoc
->state
!= SCTP_STATE_SHUTDOWN_PENDING
)
710 t
->asoc
->overall_error_count
= 0;
712 /* Clear the hb_sent flag to signal that we had a good
717 /* Mark the destination transport address as active if it is not so
720 if ((t
->state
== SCTP_INACTIVE
) || (t
->state
== SCTP_UNCONFIRMED
)) {
722 sctp_assoc_control_transport(asoc
, t
, SCTP_TRANSPORT_UP
,
723 SCTP_HEARTBEAT_SUCCESS
);
726 if (t
->state
== SCTP_PF
)
727 sctp_assoc_control_transport(asoc
, t
, SCTP_TRANSPORT_UP
,
728 SCTP_HEARTBEAT_SUCCESS
);
730 /* The receiver of the HEARTBEAT ACK should also perform an
731 * RTT measurement for that destination transport address
732 * using the time value carried in the HEARTBEAT ACK chunk.
733 * If the transport's rto_pending variable has been cleared,
734 * it was most likely due to a retransmit. However, we want
735 * to re-enable it to properly update the rto.
737 if (t
->rto_pending
== 0)
740 hbinfo
= (sctp_sender_hb_info_t
*) chunk
->skb
->data
;
741 sctp_transport_update_rto(t
, (jiffies
- hbinfo
->sent_at
));
743 /* Update the heartbeat timer. */
744 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
745 sctp_transport_hold(t
);
747 if (was_unconfirmed
&& asoc
->peer
.transport_count
== 1)
748 sctp_transport_immediate_rtx(t
);
752 /* Helper function to process the process SACK command. */
753 static int sctp_cmd_process_sack(sctp_cmd_seq_t
*cmds
,
754 struct sctp_association
*asoc
,
755 struct sctp_sackhdr
*sackh
)
759 if (sctp_outq_sack(&asoc
->outqueue
, sackh
)) {
760 struct net
*net
= sock_net(asoc
->base
.sk
);
762 /* There are no more TSNs awaiting SACK. */
763 err
= sctp_do_sm(net
, SCTP_EVENT_T_OTHER
,
764 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN
),
765 asoc
->state
, asoc
->ep
, asoc
, NULL
,
772 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
773 * the transport for a shutdown chunk.
775 static void sctp_cmd_setup_t2(sctp_cmd_seq_t
*cmds
,
776 struct sctp_association
*asoc
,
777 struct sctp_chunk
*chunk
)
779 struct sctp_transport
*t
;
781 if (chunk
->transport
)
782 t
= chunk
->transport
;
784 t
= sctp_assoc_choose_alter_transport(asoc
,
785 asoc
->shutdown_last_sent_to
);
786 chunk
->transport
= t
;
788 asoc
->shutdown_last_sent_to
= t
;
789 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
] = t
->rto
;
792 /* Helper function to change the state of an association. */
793 static void sctp_cmd_new_state(sctp_cmd_seq_t
*cmds
,
794 struct sctp_association
*asoc
,
797 struct sock
*sk
= asoc
->base
.sk
;
801 SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n",
802 asoc
, sctp_state_tbl
[state
]);
804 if (sctp_style(sk
, TCP
)) {
805 /* Change the sk->sk_state of a TCP-style socket that has
806 * successfully completed a connect() call.
808 if (sctp_state(asoc
, ESTABLISHED
) && sctp_sstate(sk
, CLOSED
))
809 sk
->sk_state
= SCTP_SS_ESTABLISHED
;
811 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
812 if (sctp_state(asoc
, SHUTDOWN_RECEIVED
) &&
813 sctp_sstate(sk
, ESTABLISHED
))
814 sk
->sk_shutdown
|= RCV_SHUTDOWN
;
817 if (sctp_state(asoc
, COOKIE_WAIT
)) {
818 /* Reset init timeouts since they may have been
819 * increased due to timer expirations.
821 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] =
823 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] =
827 if (sctp_state(asoc
, ESTABLISHED
) ||
828 sctp_state(asoc
, CLOSED
) ||
829 sctp_state(asoc
, SHUTDOWN_RECEIVED
)) {
830 /* Wake up any processes waiting in the asoc's wait queue in
831 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
833 if (waitqueue_active(&asoc
->wait
))
834 wake_up_interruptible(&asoc
->wait
);
836 /* Wake up any processes waiting in the sk's sleep queue of
837 * a TCP-style or UDP-style peeled-off socket in
838 * sctp_wait_for_accept() or sctp_wait_for_packet().
839 * For a UDP-style socket, the waiters are woken up by the
842 if (!sctp_style(sk
, UDP
))
843 sk
->sk_state_change(sk
);
847 /* Helper function to delete an association. */
848 static void sctp_cmd_delete_tcb(sctp_cmd_seq_t
*cmds
,
849 struct sctp_association
*asoc
)
851 struct sock
*sk
= asoc
->base
.sk
;
853 /* If it is a non-temporary association belonging to a TCP-style
854 * listening socket that is not closed, do not free it so that accept()
855 * can pick it up later.
857 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
) &&
858 (!asoc
->temp
) && (sk
->sk_shutdown
!= SHUTDOWN_MASK
))
861 sctp_unhash_established(asoc
);
862 sctp_association_free(asoc
);
866 * ADDIP Section 4.1 ASCONF Chunk Procedures
867 * A4) Start a T-4 RTO timer, using the RTO value of the selected
868 * destination address (we use active path instead of primary path just
869 * because primary path may be inactive.
871 static void sctp_cmd_setup_t4(sctp_cmd_seq_t
*cmds
,
872 struct sctp_association
*asoc
,
873 struct sctp_chunk
*chunk
)
875 struct sctp_transport
*t
;
877 t
= sctp_assoc_choose_alter_transport(asoc
, chunk
->transport
);
878 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T4_RTO
] = t
->rto
;
879 chunk
->transport
= t
;
882 /* Process an incoming Operation Error Chunk. */
883 static void sctp_cmd_process_operr(sctp_cmd_seq_t
*cmds
,
884 struct sctp_association
*asoc
,
885 struct sctp_chunk
*chunk
)
887 struct sctp_errhdr
*err_hdr
;
888 struct sctp_ulpevent
*ev
;
890 while (chunk
->chunk_end
> chunk
->skb
->data
) {
891 err_hdr
= (struct sctp_errhdr
*)(chunk
->skb
->data
);
893 ev
= sctp_ulpevent_make_remote_error(asoc
, chunk
, 0,
898 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
900 switch (err_hdr
->cause
) {
901 case SCTP_ERROR_UNKNOWN_CHUNK
:
903 sctp_chunkhdr_t
*unk_chunk_hdr
;
905 unk_chunk_hdr
= (sctp_chunkhdr_t
*)err_hdr
->variable
;
906 switch (unk_chunk_hdr
->type
) {
907 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with
908 * an ERROR chunk reporting that it did not recognized
909 * the ASCONF chunk type, the sender of the ASCONF MUST
910 * NOT send any further ASCONF chunks and MUST stop its
913 case SCTP_CID_ASCONF
:
914 if (asoc
->peer
.asconf_capable
== 0)
917 asoc
->peer
.asconf_capable
= 0;
918 sctp_add_cmd_sf(cmds
, SCTP_CMD_TIMER_STOP
,
919 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO
));
932 /* Process variable FWDTSN chunk information. */
933 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq
*ulpq
,
934 struct sctp_chunk
*chunk
)
936 struct sctp_fwdtsn_skip
*skip
;
937 /* Walk through all the skipped SSNs */
938 sctp_walk_fwdtsn(skip
, chunk
) {
939 sctp_ulpq_skip(ulpq
, ntohs(skip
->stream
), ntohs(skip
->ssn
));
943 /* Helper function to remove the association non-primary peer
946 static void sctp_cmd_del_non_primary(struct sctp_association
*asoc
)
948 struct sctp_transport
*t
;
949 struct list_head
*pos
;
950 struct list_head
*temp
;
952 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
953 t
= list_entry(pos
, struct sctp_transport
, transports
);
954 if (!sctp_cmp_addr_exact(&t
->ipaddr
,
955 &asoc
->peer
.primary_addr
)) {
956 sctp_assoc_del_peer(asoc
, &t
->ipaddr
);
961 /* Helper function to set sk_err on a 1-1 style socket. */
962 static void sctp_cmd_set_sk_err(struct sctp_association
*asoc
, int error
)
964 struct sock
*sk
= asoc
->base
.sk
;
966 if (!sctp_style(sk
, UDP
))
970 /* Helper function to generate an association change event */
971 static void sctp_cmd_assoc_change(sctp_cmd_seq_t
*commands
,
972 struct sctp_association
*asoc
,
975 struct sctp_ulpevent
*ev
;
977 ev
= sctp_ulpevent_make_assoc_change(asoc
, 0, state
, 0,
978 asoc
->c
.sinit_num_ostreams
,
979 asoc
->c
.sinit_max_instreams
,
982 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
985 /* Helper function to generate an adaptation indication event */
986 static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t
*commands
,
987 struct sctp_association
*asoc
)
989 struct sctp_ulpevent
*ev
;
991 ev
= sctp_ulpevent_make_adaptation_indication(asoc
, GFP_ATOMIC
);
994 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
998 static void sctp_cmd_t1_timer_update(struct sctp_association
*asoc
,
999 sctp_event_timeout_t timer
,
1002 struct sctp_transport
*t
;
1004 t
= asoc
->init_last_sent_to
;
1005 asoc
->init_err_counter
++;
1007 if (t
->init_sent_count
> (asoc
->init_cycle
+ 1)) {
1008 asoc
->timeouts
[timer
] *= 2;
1009 if (asoc
->timeouts
[timer
] > asoc
->max_init_timeo
) {
1010 asoc
->timeouts
[timer
] = asoc
->max_init_timeo
;
1014 "T1 %s Timeout adjustment"
1015 " init_err_counter: %d"
1019 asoc
->init_err_counter
,
1021 asoc
->timeouts
[timer
]);
1026 /* Send the whole message, chunk by chunk, to the outqueue.
1027 * This way the whole message is queued up and bundling if
1028 * encouraged for small fragments.
1030 static int sctp_cmd_send_msg(struct sctp_association
*asoc
,
1031 struct sctp_datamsg
*msg
)
1033 struct sctp_chunk
*chunk
;
1036 list_for_each_entry(chunk
, &msg
->chunks
, frag_list
) {
1037 error
= sctp_outq_tail(&asoc
->outqueue
, chunk
);
1046 /* Sent the next ASCONF packet currently stored in the association.
1047 * This happens after the ASCONF_ACK was succeffully processed.
1049 static void sctp_cmd_send_asconf(struct sctp_association
*asoc
)
1051 struct net
*net
= sock_net(asoc
->base
.sk
);
1053 /* Send the next asconf chunk from the addip chunk
1056 if (!list_empty(&asoc
->addip_chunk_list
)) {
1057 struct list_head
*entry
= asoc
->addip_chunk_list
.next
;
1058 struct sctp_chunk
*asconf
= list_entry(entry
,
1059 struct sctp_chunk
, list
);
1060 list_del_init(entry
);
1062 /* Hold the chunk until an ASCONF_ACK is received. */
1063 sctp_chunk_hold(asconf
);
1064 if (sctp_primitive_ASCONF(net
, asoc
, asconf
))
1065 sctp_chunk_free(asconf
);
1067 asoc
->addip_last_asconf
= asconf
;
1072 /* These three macros allow us to pull the debugging code out of the
1073 * main flow of sctp_do_sm() to keep attention focused on the real
1074 * functionality there.
1077 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
1078 "ep %p, %s, %s, asoc %p[%s], %s\n", \
1079 ep, sctp_evttype_tbl[event_type], \
1080 (*debug_fn)(subtype), asoc, \
1081 sctp_state_tbl[state], state_fn->name)
1083 #define DEBUG_POST \
1084 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
1085 "asoc %p, status: %s\n", \
1086 asoc, sctp_status_tbl[status])
1088 #define DEBUG_POST_SFX \
1089 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
1091 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
1092 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
1095 * This is the master state machine processing function.
1097 * If you want to understand all of lksctp, this is a
1098 * good place to start.
1100 int sctp_do_sm(struct net
*net
, sctp_event_t event_type
, sctp_subtype_t subtype
,
1102 struct sctp_endpoint
*ep
,
1103 struct sctp_association
*asoc
,
1107 sctp_cmd_seq_t commands
;
1108 const sctp_sm_table_entry_t
*state_fn
;
1109 sctp_disposition_t status
;
1111 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
,
1140 /*****************************************************************
1141 * This the master state function side effect processing function.
1142 *****************************************************************/
1143 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
1145 struct sctp_endpoint
*ep
,
1146 struct sctp_association
*asoc
,
1148 sctp_disposition_t status
,
1149 sctp_cmd_seq_t
*commands
,
1154 /* FIXME - Most of the dispositions left today would be categorized
1155 * as "exceptional" dispositions. For those dispositions, it
1156 * may not be proper to run through any of the commands at all.
1157 * For example, the command interpreter might be run only with
1158 * disposition SCTP_DISPOSITION_CONSUME.
1160 if (0 != (error
= sctp_cmd_interpreter(event_type
, subtype
, state
,
1167 case SCTP_DISPOSITION_DISCARD
:
1168 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
1169 "event_type %d, event_id %d\n",
1170 state
, event_type
, subtype
.chunk
);
1173 case SCTP_DISPOSITION_NOMEM
:
1174 /* We ran out of memory, so we need to discard this
1177 /* BUG--we should now recover some memory, probably by
1183 case SCTP_DISPOSITION_DELETE_TCB
:
1184 /* This should now be a command. */
1187 case SCTP_DISPOSITION_CONSUME
:
1188 case SCTP_DISPOSITION_ABORT
:
1190 * We should no longer have much work to do here as the
1191 * real work has been done as explicit commands above.
1195 case SCTP_DISPOSITION_VIOLATION
:
1196 net_err_ratelimited("protocol violation state %d chunkid %d\n",
1197 state
, subtype
.chunk
);
1200 case SCTP_DISPOSITION_NOT_IMPL
:
1201 pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n",
1202 state
, event_type
, subtype
.chunk
);
1205 case SCTP_DISPOSITION_BUG
:
1206 pr_err("bug in state %d, event_type %d, event_id %d\n",
1207 state
, event_type
, subtype
.chunk
);
1212 pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n",
1213 status
, state
, event_type
, subtype
.chunk
);
1222 /********************************************************************
1223 * 2nd Level Abstractions
1224 ********************************************************************/
1226 /* This is the side-effect interpreter. */
1227 static int sctp_cmd_interpreter(sctp_event_t event_type
,
1228 sctp_subtype_t subtype
,
1230 struct sctp_endpoint
*ep
,
1231 struct sctp_association
*asoc
,
1233 sctp_disposition_t status
,
1234 sctp_cmd_seq_t
*commands
,
1240 struct sctp_chunk
*new_obj
;
1241 struct sctp_chunk
*chunk
= NULL
;
1242 struct sctp_packet
*packet
;
1243 struct timer_list
*timer
;
1244 unsigned long timeout
;
1245 struct sctp_transport
*t
;
1246 struct sctp_sackhdr sackh
;
1249 if (SCTP_EVENT_T_TIMEOUT
!= event_type
)
1252 /* Note: This whole file is a huge candidate for rework.
1253 * For example, each command could either have its own handler, so
1254 * the loop would look like:
1256 * cmd->handle(x, y, z)
1259 while (NULL
!= (cmd
= sctp_next_cmd(commands
))) {
1260 switch (cmd
->verb
) {
1265 case SCTP_CMD_NEW_ASOC
:
1266 /* Register a new association. */
1268 sctp_outq_uncork(&asoc
->outqueue
);
1271 asoc
= cmd
->obj
.ptr
;
1272 /* Register with the endpoint. */
1273 sctp_endpoint_add_asoc(ep
, asoc
);
1274 sctp_hash_established(asoc
);
1277 case SCTP_CMD_UPDATE_ASSOC
:
1278 sctp_assoc_update(asoc
, cmd
->obj
.ptr
);
1281 case SCTP_CMD_PURGE_OUTQUEUE
:
1282 sctp_outq_teardown(&asoc
->outqueue
);
1285 case SCTP_CMD_DELETE_TCB
:
1287 sctp_outq_uncork(&asoc
->outqueue
);
1290 /* Delete the current association. */
1291 sctp_cmd_delete_tcb(commands
, asoc
);
1295 case SCTP_CMD_NEW_STATE
:
1296 /* Enter a new state. */
1297 sctp_cmd_new_state(commands
, asoc
, cmd
->obj
.state
);
1300 case SCTP_CMD_REPORT_TSN
:
1301 /* Record the arrival of a TSN. */
1302 error
= sctp_tsnmap_mark(&asoc
->peer
.tsn_map
,
1303 cmd
->obj
.u32
, NULL
);
1306 case SCTP_CMD_REPORT_FWDTSN
:
1307 /* Move the Cumulattive TSN Ack ahead. */
1308 sctp_tsnmap_skip(&asoc
->peer
.tsn_map
, cmd
->obj
.u32
);
1310 /* purge the fragmentation queue */
1311 sctp_ulpq_reasm_flushtsn(&asoc
->ulpq
, cmd
->obj
.u32
);
1313 /* Abort any in progress partial delivery. */
1314 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
1317 case SCTP_CMD_PROCESS_FWDTSN
:
1318 sctp_cmd_process_fwdtsn(&asoc
->ulpq
, cmd
->obj
.ptr
);
1321 case SCTP_CMD_GEN_SACK
:
1322 /* Generate a Selective ACK.
1323 * The argument tells us whether to just count
1324 * the packet and MAYBE generate a SACK, or
1327 force
= cmd
->obj
.i32
;
1328 error
= sctp_gen_sack(asoc
, force
, commands
);
1331 case SCTP_CMD_PROCESS_SACK
:
1332 /* Process an inbound SACK. */
1333 error
= sctp_cmd_process_sack(commands
, asoc
,
1337 case SCTP_CMD_GEN_INIT_ACK
:
1338 /* Generate an INIT ACK chunk. */
1339 new_obj
= sctp_make_init_ack(asoc
, chunk
, GFP_ATOMIC
,
1344 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1345 SCTP_CHUNK(new_obj
));
1348 case SCTP_CMD_PEER_INIT
:
1349 /* Process a unified INIT from the peer.
1350 * Note: Only used during INIT-ACK processing. If
1351 * there is an error just return to the outter
1352 * layer which will bail.
1354 error
= sctp_cmd_process_init(commands
, asoc
, chunk
,
1358 case SCTP_CMD_GEN_COOKIE_ECHO
:
1359 /* Generate a COOKIE ECHO chunk. */
1360 new_obj
= sctp_make_cookie_echo(asoc
, chunk
);
1363 sctp_chunk_free(cmd
->obj
.ptr
);
1366 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1367 SCTP_CHUNK(new_obj
));
1369 /* If there is an ERROR chunk to be sent along with
1370 * the COOKIE_ECHO, send it, too.
1373 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1374 SCTP_CHUNK(cmd
->obj
.ptr
));
1376 if (new_obj
->transport
) {
1377 new_obj
->transport
->init_sent_count
++;
1378 asoc
->init_last_sent_to
= new_obj
->transport
;
1381 /* FIXME - Eventually come up with a cleaner way to
1382 * enabling COOKIE-ECHO + DATA bundling during
1383 * multihoming stale cookie scenarios, the following
1384 * command plays with asoc->peer.retran_path to
1385 * avoid the problem of sending the COOKIE-ECHO and
1386 * DATA in different paths, which could result
1387 * in the association being ABORTed if the DATA chunk
1388 * is processed first by the server. Checking the
1389 * init error counter simply causes this command
1390 * to be executed only during failed attempts of
1391 * association establishment.
1393 if ((asoc
->peer
.retran_path
!=
1394 asoc
->peer
.primary_path
) &&
1395 (asoc
->init_err_counter
> 0)) {
1396 sctp_add_cmd_sf(commands
,
1397 SCTP_CMD_FORCE_PRIM_RETRAN
,
1403 case SCTP_CMD_GEN_SHUTDOWN
:
1404 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1405 * Reset error counts.
1407 asoc
->overall_error_count
= 0;
1409 /* Generate a SHUTDOWN chunk. */
1410 new_obj
= sctp_make_shutdown(asoc
, chunk
);
1413 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1414 SCTP_CHUNK(new_obj
));
1417 case SCTP_CMD_CHUNK_ULP
:
1418 /* Send a chunk to the sockets layer. */
1419 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1420 "chunk_up:", cmd
->obj
.ptr
,
1421 "ulpq:", &asoc
->ulpq
);
1422 sctp_ulpq_tail_data(&asoc
->ulpq
, cmd
->obj
.ptr
,
1426 case SCTP_CMD_EVENT_ULP
:
1427 /* Send a notification to the sockets layer. */
1428 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1429 "event_up:",cmd
->obj
.ptr
,
1430 "ulpq:",&asoc
->ulpq
);
1431 sctp_ulpq_tail_event(&asoc
->ulpq
, cmd
->obj
.ptr
);
1434 case SCTP_CMD_REPLY
:
1435 /* If an caller has not already corked, do cork. */
1436 if (!asoc
->outqueue
.cork
) {
1437 sctp_outq_cork(&asoc
->outqueue
);
1440 /* Send a chunk to our peer. */
1441 error
= sctp_outq_tail(&asoc
->outqueue
, cmd
->obj
.ptr
);
1444 case SCTP_CMD_SEND_PKT
:
1445 /* Send a full packet to our peer. */
1446 packet
= cmd
->obj
.ptr
;
1447 sctp_packet_transmit(packet
);
1448 sctp_ootb_pkt_free(packet
);
1451 case SCTP_CMD_T1_RETRAN
:
1452 /* Mark a transport for retransmission. */
1453 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1457 case SCTP_CMD_RETRAN
:
1458 /* Mark a transport for retransmission. */
1459 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1463 case SCTP_CMD_ECN_CE
:
1464 /* Do delayed CE processing. */
1465 sctp_do_ecn_ce_work(asoc
, cmd
->obj
.u32
);
1468 case SCTP_CMD_ECN_ECNE
:
1469 /* Do delayed ECNE processing. */
1470 new_obj
= sctp_do_ecn_ecne_work(asoc
, cmd
->obj
.u32
,
1473 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1474 SCTP_CHUNK(new_obj
));
1477 case SCTP_CMD_ECN_CWR
:
1478 /* Do delayed CWR processing. */
1479 sctp_do_ecn_cwr_work(asoc
, cmd
->obj
.u32
);
1482 case SCTP_CMD_SETUP_T2
:
1483 sctp_cmd_setup_t2(commands
, asoc
, cmd
->obj
.ptr
);
1486 case SCTP_CMD_TIMER_START_ONCE
:
1487 timer
= &asoc
->timers
[cmd
->obj
.to
];
1489 if (timer_pending(timer
))
1493 case SCTP_CMD_TIMER_START
:
1494 timer
= &asoc
->timers
[cmd
->obj
.to
];
1495 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1498 timer
->expires
= jiffies
+ timeout
;
1499 sctp_association_hold(asoc
);
1503 case SCTP_CMD_TIMER_RESTART
:
1504 timer
= &asoc
->timers
[cmd
->obj
.to
];
1505 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1506 if (!mod_timer(timer
, jiffies
+ timeout
))
1507 sctp_association_hold(asoc
);
1510 case SCTP_CMD_TIMER_STOP
:
1511 timer
= &asoc
->timers
[cmd
->obj
.to
];
1512 if (timer_pending(timer
) && del_timer(timer
))
1513 sctp_association_put(asoc
);
1516 case SCTP_CMD_INIT_CHOOSE_TRANSPORT
:
1517 chunk
= cmd
->obj
.ptr
;
1518 t
= sctp_assoc_choose_alter_transport(asoc
,
1519 asoc
->init_last_sent_to
);
1520 asoc
->init_last_sent_to
= t
;
1521 chunk
->transport
= t
;
1522 t
->init_sent_count
++;
1523 /* Set the new transport as primary */
1524 sctp_assoc_set_primary(asoc
, t
);
1527 case SCTP_CMD_INIT_RESTART
:
1528 /* Do the needed accounting and updates
1529 * associated with restarting an initialization
1530 * timer. Only multiply the timeout by two if
1531 * all transports have been tried at the current
1534 sctp_cmd_t1_timer_update(asoc
,
1535 SCTP_EVENT_TIMEOUT_T1_INIT
,
1538 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
1539 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT
));
1542 case SCTP_CMD_COOKIEECHO_RESTART
:
1543 /* Do the needed accounting and updates
1544 * associated with restarting an initialization
1545 * timer. Only multiply the timeout by two if
1546 * all transports have been tried at the current
1549 sctp_cmd_t1_timer_update(asoc
,
1550 SCTP_EVENT_TIMEOUT_T1_COOKIE
,
1553 /* If we've sent any data bundled with
1554 * COOKIE-ECHO we need to resend.
1556 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
1558 sctp_retransmit_mark(&asoc
->outqueue
, t
,
1562 sctp_add_cmd_sf(commands
,
1563 SCTP_CMD_TIMER_RESTART
,
1564 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE
));
1567 case SCTP_CMD_INIT_FAILED
:
1568 sctp_cmd_init_failed(commands
, asoc
, cmd
->obj
.err
);
1571 case SCTP_CMD_ASSOC_FAILED
:
1572 sctp_cmd_assoc_failed(commands
, asoc
, event_type
,
1573 subtype
, chunk
, cmd
->obj
.err
);
1576 case SCTP_CMD_INIT_COUNTER_INC
:
1577 asoc
->init_err_counter
++;
1580 case SCTP_CMD_INIT_COUNTER_RESET
:
1581 asoc
->init_err_counter
= 0;
1582 asoc
->init_cycle
= 0;
1583 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
1585 t
->init_sent_count
= 0;
1589 case SCTP_CMD_REPORT_DUP
:
1590 sctp_tsnmap_mark_dup(&asoc
->peer
.tsn_map
,
1594 case SCTP_CMD_REPORT_BAD_TAG
:
1595 SCTP_DEBUG_PRINTK("vtag mismatch!\n");
1598 case SCTP_CMD_STRIKE
:
1599 /* Mark one strike against a transport. */
1600 sctp_do_8_2_transport_strike(commands
, asoc
,
1601 cmd
->obj
.transport
, 0);
1604 case SCTP_CMD_TRANSPORT_IDLE
:
1605 t
= cmd
->obj
.transport
;
1606 sctp_transport_lower_cwnd(t
, SCTP_LOWER_CWND_INACTIVE
);
1609 case SCTP_CMD_TRANSPORT_HB_SENT
:
1610 t
= cmd
->obj
.transport
;
1611 sctp_do_8_2_transport_strike(commands
, asoc
,
1616 case SCTP_CMD_TRANSPORT_ON
:
1617 t
= cmd
->obj
.transport
;
1618 sctp_cmd_transport_on(commands
, asoc
, t
, chunk
);
1621 case SCTP_CMD_HB_TIMERS_START
:
1622 sctp_cmd_hb_timers_start(commands
, asoc
);
1625 case SCTP_CMD_HB_TIMER_UPDATE
:
1626 t
= cmd
->obj
.transport
;
1627 sctp_cmd_hb_timer_update(commands
, t
);
1630 case SCTP_CMD_HB_TIMERS_STOP
:
1631 sctp_cmd_hb_timers_stop(commands
, asoc
);
1634 case SCTP_CMD_REPORT_ERROR
:
1635 error
= cmd
->obj
.error
;
1638 case SCTP_CMD_PROCESS_CTSN
:
1639 /* Dummy up a SACK for processing. */
1640 sackh
.cum_tsn_ack
= cmd
->obj
.be32
;
1641 sackh
.a_rwnd
= asoc
->peer
.rwnd
+
1642 asoc
->outqueue
.outstanding_bytes
;
1643 sackh
.num_gap_ack_blocks
= 0;
1644 sackh
.num_dup_tsns
= 0;
1645 sctp_add_cmd_sf(commands
, SCTP_CMD_PROCESS_SACK
,
1646 SCTP_SACKH(&sackh
));
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
, cmd
->obj
.ptr
,
1671 case SCTP_CMD_RENEGE
:
1672 sctp_ulpq_renege(&asoc
->ulpq
, cmd
->obj
.ptr
,
1676 case SCTP_CMD_SETUP_T4
:
1677 sctp_cmd_setup_t4(commands
, asoc
, cmd
->obj
.ptr
);
1680 case SCTP_CMD_PROCESS_OPERR
:
1681 sctp_cmd_process_operr(commands
, asoc
, chunk
);
1683 case SCTP_CMD_CLEAR_INIT_TAG
:
1684 asoc
->peer
.i
.init_tag
= 0;
1686 case SCTP_CMD_DEL_NON_PRIMARY
:
1687 sctp_cmd_del_non_primary(asoc
);
1689 case SCTP_CMD_T3_RTX_TIMERS_STOP
:
1690 sctp_cmd_t3_rtx_timers_stop(commands
, asoc
);
1692 case SCTP_CMD_FORCE_PRIM_RETRAN
:
1693 t
= asoc
->peer
.retran_path
;
1694 asoc
->peer
.retran_path
= asoc
->peer
.primary_path
;
1695 error
= sctp_outq_uncork(&asoc
->outqueue
);
1697 asoc
->peer
.retran_path
= t
;
1699 case SCTP_CMD_SET_SK_ERR
:
1700 sctp_cmd_set_sk_err(asoc
, cmd
->obj
.error
);
1702 case SCTP_CMD_ASSOC_CHANGE
:
1703 sctp_cmd_assoc_change(commands
, asoc
,
1706 case SCTP_CMD_ADAPTATION_IND
:
1707 sctp_cmd_adaptation_ind(commands
, asoc
);
1710 case SCTP_CMD_ASSOC_SHKEY
:
1711 error
= sctp_auth_asoc_init_active_key(asoc
,
1714 case SCTP_CMD_UPDATE_INITTAG
:
1715 asoc
->peer
.i
.init_tag
= cmd
->obj
.u32
;
1717 case SCTP_CMD_SEND_MSG
:
1718 if (!asoc
->outqueue
.cork
) {
1719 sctp_outq_cork(&asoc
->outqueue
);
1722 error
= sctp_cmd_send_msg(asoc
, cmd
->obj
.msg
);
1724 case SCTP_CMD_SEND_NEXT_ASCONF
:
1725 sctp_cmd_send_asconf(asoc
);
1727 case SCTP_CMD_PURGE_ASCONF_QUEUE
:
1728 sctp_asconf_queue_teardown(asoc
);
1731 case SCTP_CMD_SET_ASOC
:
1732 asoc
= cmd
->obj
.asoc
;
1736 pr_warn("Impossible command: %u, %p\n",
1737 cmd
->verb
, cmd
->obj
.ptr
);
1746 /* If this is in response to a received chunk, wait until
1747 * we are done with the packet to open the queue so that we don't
1748 * send multiple packets in response to a single request.
1750 if (asoc
&& SCTP_EVENT_T_CHUNK
== event_type
&& chunk
) {
1751 if (chunk
->end_of_packet
|| chunk
->singleton
)
1752 error
= sctp_outq_uncork(&asoc
->outqueue
);
1753 } else if (local_cork
)
1754 error
= sctp_outq_uncork(&asoc
->outqueue
);