1 /* SCTP kernel reference 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 reference 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 * The SCTP reference 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 * The SCTP reference 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 #include <linux/skbuff.h>
51 #include <linux/types.h>
52 #include <linux/socket.h>
55 #include <net/sctp/sctp.h>
56 #include <net/sctp/sm.h>
58 static int sctp_cmd_interpreter(sctp_event_t event_type
,
59 sctp_subtype_t subtype
,
61 struct sctp_endpoint
*ep
,
62 struct sctp_association
*asoc
,
64 sctp_disposition_t status
,
65 sctp_cmd_seq_t
*commands
,
67 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
69 struct sctp_endpoint
*ep
,
70 struct sctp_association
*asoc
,
72 sctp_disposition_t status
,
73 sctp_cmd_seq_t
*commands
,
76 /********************************************************************
78 ********************************************************************/
80 /* A helper function for delayed processing of INET ECN CE bit. */
81 static void sctp_do_ecn_ce_work(struct sctp_association
*asoc
,
84 /* Save the TSN away for comparison when we receive CWR */
86 asoc
->last_ecne_tsn
= lowest_tsn
;
90 /* Helper function for delayed processing of SCTP ECNE chunk. */
91 /* RFC 2960 Appendix A
93 * RFC 2481 details a specific bit for a sender to send in
94 * the header of its next outbound TCP segment to indicate to
95 * its peer that it has reduced its congestion window. This
96 * is termed the CWR bit. For SCTP the same indication is made
97 * by including the CWR chunk. This chunk contains one data
98 * element, i.e. the TSN number that was sent in the ECNE chunk.
99 * This element represents the lowest TSN number in the datagram
100 * that was originally marked with the CE bit.
102 static struct sctp_chunk
*sctp_do_ecn_ecne_work(struct sctp_association
*asoc
,
104 struct sctp_chunk
*chunk
)
106 struct sctp_chunk
*repl
;
108 /* Our previously transmitted packet ran into some congestion
109 * so we should take action by reducing cwnd and ssthresh
110 * and then ACK our peer that we we've done so by
114 /* First, try to determine if we want to actually lower
115 * our cwnd variables. Only lower them if the ECNE looks more
116 * recent than the last response.
118 if (TSN_lt(asoc
->last_cwr_tsn
, lowest_tsn
)) {
119 struct sctp_transport
*transport
;
121 /* Find which transport's congestion variables
122 * need to be adjusted.
124 transport
= sctp_assoc_lookup_tsn(asoc
, lowest_tsn
);
126 /* Update the congestion variables. */
128 sctp_transport_lower_cwnd(transport
,
129 SCTP_LOWER_CWND_ECNE
);
130 asoc
->last_cwr_tsn
= lowest_tsn
;
133 /* Always try to quiet the other end. In case of lost CWR,
134 * resend last_cwr_tsn.
136 repl
= sctp_make_cwr(asoc
, asoc
->last_cwr_tsn
, chunk
);
138 /* If we run out of memory, it will look like a lost CWR. We'll
139 * get back in sync eventually.
144 /* Helper function to do delayed processing of ECN CWR chunk. */
145 static void sctp_do_ecn_cwr_work(struct sctp_association
*asoc
,
148 /* Turn off ECNE getting auto-prepended to every outgoing
154 /* Generate SACK if necessary. We call this at the end of a packet. */
155 static int sctp_gen_sack(struct sctp_association
*asoc
, int force
,
156 sctp_cmd_seq_t
*commands
)
158 __u32 ctsn
, max_tsn_seen
;
159 struct sctp_chunk
*sack
;
163 asoc
->peer
.sack_needed
= 1;
165 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
166 max_tsn_seen
= sctp_tsnmap_get_max_tsn_seen(&asoc
->peer
.tsn_map
);
168 /* From 12.2 Parameters necessary per association (i.e. the TCB):
170 * Ack State : This flag indicates if the next received packet
171 * : is to be responded to with a SACK. ...
172 * : When DATA chunks are out of order, SACK's
173 * : are not delayed (see Section 6).
175 * [This is actually not mentioned in Section 6, but we
176 * implement it here anyway. --piggy]
178 if (max_tsn_seen
!= ctsn
)
179 asoc
->peer
.sack_needed
= 1;
181 /* From 6.2 Acknowledgement on Reception of DATA Chunks:
183 * Section 4.2 of [RFC2581] SHOULD be followed. Specifically,
184 * an acknowledgement SHOULD be generated for at least every
185 * second packet (not every second DATA chunk) received, and
186 * SHOULD be generated within 200 ms of the arrival of any
187 * unacknowledged DATA chunk. ...
189 if (!asoc
->peer
.sack_needed
) {
190 /* We will need a SACK for the next packet. */
191 asoc
->peer
.sack_needed
= 1;
194 if (asoc
->a_rwnd
> asoc
->rwnd
)
195 asoc
->a_rwnd
= asoc
->rwnd
;
196 sack
= sctp_make_sack(asoc
);
200 asoc
->peer
.sack_needed
= 0;
202 error
= sctp_outq_tail(&asoc
->outqueue
, sack
);
204 /* Stop the SACK timer. */
205 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_STOP
,
206 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
215 /* When the T3-RTX timer expires, it calls this function to create the
216 * relevant state machine event.
218 void sctp_generate_t3_rtx_event(unsigned long peer
)
221 struct sctp_transport
*transport
= (struct sctp_transport
*) peer
;
222 struct sctp_association
*asoc
= transport
->asoc
;
224 /* Check whether a task is in the sock. */
226 sctp_bh_lock_sock(asoc
->base
.sk
);
227 if (sock_owned_by_user(asoc
->base
.sk
)) {
228 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __FUNCTION__
);
230 /* Try again later. */
231 if (!mod_timer(&transport
->T3_rtx_timer
, jiffies
+ (HZ
/20)))
232 sctp_transport_hold(transport
);
236 /* Is this transport really dead and just waiting around for
237 * the timer to let go of the reference?
242 /* Run through the state machine. */
243 error
= sctp_do_sm(SCTP_EVENT_T_TIMEOUT
,
244 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX
),
247 transport
, GFP_ATOMIC
);
250 asoc
->base
.sk
->sk_err
= -error
;
253 sctp_bh_unlock_sock(asoc
->base
.sk
);
254 sctp_transport_put(transport
);
257 /* This is a sa interface for producing timeout events. It works
258 * for timeouts which use the association as their parameter.
260 static void sctp_generate_timeout_event(struct sctp_association
*asoc
,
261 sctp_event_timeout_t timeout_type
)
265 sctp_bh_lock_sock(asoc
->base
.sk
);
266 if (sock_owned_by_user(asoc
->base
.sk
)) {
267 SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n",
271 /* Try again later. */
272 if (!mod_timer(&asoc
->timers
[timeout_type
], jiffies
+ (HZ
/20)))
273 sctp_association_hold(asoc
);
277 /* Is this association really dead and just waiting around for
278 * the timer to let go of the reference?
283 /* Run through the state machine. */
284 error
= sctp_do_sm(SCTP_EVENT_T_TIMEOUT
,
285 SCTP_ST_TIMEOUT(timeout_type
),
286 asoc
->state
, asoc
->ep
, asoc
,
287 (void *)timeout_type
, GFP_ATOMIC
);
290 asoc
->base
.sk
->sk_err
= -error
;
293 sctp_bh_unlock_sock(asoc
->base
.sk
);
294 sctp_association_put(asoc
);
297 static void sctp_generate_t1_cookie_event(unsigned long data
)
299 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
300 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_COOKIE
);
303 static void sctp_generate_t1_init_event(unsigned long data
)
305 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
306 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_INIT
);
309 static void sctp_generate_t2_shutdown_event(unsigned long data
)
311 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
312 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
);
315 static void sctp_generate_t4_rto_event(unsigned long data
)
317 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
318 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T4_RTO
);
321 static void sctp_generate_t5_shutdown_guard_event(unsigned long data
)
323 struct sctp_association
*asoc
= (struct sctp_association
*)data
;
324 sctp_generate_timeout_event(asoc
,
325 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD
);
327 } /* sctp_generate_t5_shutdown_guard_event() */
329 static void sctp_generate_autoclose_event(unsigned long data
)
331 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
332 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_AUTOCLOSE
);
335 /* Generate a heart beat event. If the sock is busy, reschedule. Make
336 * sure that the transport is still valid.
338 void sctp_generate_heartbeat_event(unsigned long data
)
341 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
342 struct sctp_association
*asoc
= transport
->asoc
;
344 sctp_bh_lock_sock(asoc
->base
.sk
);
345 if (sock_owned_by_user(asoc
->base
.sk
)) {
346 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __FUNCTION__
);
348 /* Try again later. */
349 if (!mod_timer(&transport
->hb_timer
, jiffies
+ (HZ
/20)))
350 sctp_transport_hold(transport
);
354 /* Is this structure just waiting around for us to actually
360 error
= sctp_do_sm(SCTP_EVENT_T_TIMEOUT
,
361 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT
),
362 asoc
->state
, asoc
->ep
, asoc
,
363 transport
, GFP_ATOMIC
);
366 asoc
->base
.sk
->sk_err
= -error
;
369 sctp_bh_unlock_sock(asoc
->base
.sk
);
370 sctp_transport_put(transport
);
373 /* Inject a SACK Timeout event into the state machine. */
374 static void sctp_generate_sack_event(unsigned long data
)
376 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
377 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_SACK
);
380 sctp_timer_event_t
*sctp_timer_events
[SCTP_NUM_TIMEOUT_TYPES
] = {
382 sctp_generate_t1_cookie_event
,
383 sctp_generate_t1_init_event
,
384 sctp_generate_t2_shutdown_event
,
386 sctp_generate_t4_rto_event
,
387 sctp_generate_t5_shutdown_guard_event
,
388 sctp_generate_heartbeat_event
,
389 sctp_generate_sack_event
,
390 sctp_generate_autoclose_event
,
394 /* RFC 2960 8.2 Path Failure Detection
396 * When its peer endpoint is multi-homed, an endpoint should keep a
397 * error counter for each of the destination transport addresses of the
400 * Each time the T3-rtx timer expires on any address, or when a
401 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
402 * the error counter of that destination address will be incremented.
403 * When the value in the error counter exceeds the protocol parameter
404 * 'Path.Max.Retrans' of that destination address, the endpoint should
405 * mark the destination transport address as inactive, and a
406 * notification SHOULD be sent to the upper layer.
409 static void sctp_do_8_2_transport_strike(struct sctp_association
*asoc
,
410 struct sctp_transport
*transport
)
412 /* The check for association's overall error counter exceeding the
413 * threshold is done in the state function.
415 asoc
->overall_error_count
++;
417 if (transport
->state
!= SCTP_INACTIVE
&&
418 (transport
->error_count
++ >= transport
->max_retrans
)) {
419 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
420 " transport IP: port:%d failed.\n",
422 (&transport
->ipaddr
),
423 transport
->ipaddr
.v4
.sin_port
);
424 sctp_assoc_control_transport(asoc
, transport
,
426 SCTP_FAILED_THRESHOLD
);
429 /* E2) For the destination address for which the timer
430 * expires, set RTO <- RTO * 2 ("back off the timer"). The
431 * maximum value discussed in rule C7 above (RTO.max) may be
432 * used to provide an upper bound to this doubling operation.
434 transport
->rto
= min((transport
->rto
* 2), transport
->asoc
->rto_max
);
437 /* Worker routine to handle INIT command failure. */
438 static void sctp_cmd_init_failed(sctp_cmd_seq_t
*commands
,
439 struct sctp_association
*asoc
,
442 struct sctp_ulpevent
*event
;
444 event
= sctp_ulpevent_make_assoc_change(asoc
,0, SCTP_CANT_STR_ASSOC
,
449 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
450 SCTP_ULPEVENT(event
));
452 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
453 SCTP_STATE(SCTP_STATE_CLOSED
));
455 /* SEND_FAILED sent later when cleaning up the association. */
456 asoc
->outqueue
.error
= error
;
457 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
460 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
461 static void sctp_cmd_assoc_failed(sctp_cmd_seq_t
*commands
,
462 struct sctp_association
*asoc
,
463 sctp_event_t event_type
,
464 sctp_subtype_t subtype
,
465 struct sctp_chunk
*chunk
,
468 struct sctp_ulpevent
*event
;
470 /* Cancel any partial delivery in progress. */
471 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
473 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
477 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
478 SCTP_ULPEVENT(event
));
480 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
481 SCTP_STATE(SCTP_STATE_CLOSED
));
483 /* Set sk_err to ECONNRESET on a 1-1 style socket. */
484 if (!sctp_style(asoc
->base
.sk
, UDP
))
485 asoc
->base
.sk
->sk_err
= ECONNRESET
;
487 /* SEND_FAILED sent later when cleaning up the association. */
488 asoc
->outqueue
.error
= error
;
489 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
492 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
493 * inside the cookie. In reality, this is only used for INIT-ACK processing
494 * since all other cases use "temporary" associations and can do all
495 * their work in statefuns directly.
497 static int sctp_cmd_process_init(sctp_cmd_seq_t
*commands
,
498 struct sctp_association
*asoc
,
499 struct sctp_chunk
*chunk
,
500 sctp_init_chunk_t
*peer_init
, int gfp
)
504 /* We only process the init as a sideeffect in a single
505 * case. This is when we process the INIT-ACK. If we
506 * fail during INIT processing (due to malloc problems),
507 * just return the error and stop processing the stack.
509 if (!sctp_process_init(asoc
, chunk
->chunk_hdr
->type
,
510 sctp_source(chunk
), peer_init
, gfp
))
518 /* Helper function to break out starting up of heartbeat timers. */
519 static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t
*cmds
,
520 struct sctp_association
*asoc
)
522 struct sctp_transport
*t
;
523 struct list_head
*pos
;
525 /* Start a heartbeat timer for each transport on the association.
526 * hold a reference on the transport to make sure none of
527 * the needed data structures go away.
529 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
530 t
= list_entry(pos
, struct sctp_transport
, transports
);
532 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
533 sctp_transport_hold(t
);
537 static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t
*cmds
,
538 struct sctp_association
*asoc
)
540 struct sctp_transport
*t
;
541 struct list_head
*pos
;
543 /* Stop all heartbeat timers. */
545 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
546 t
= list_entry(pos
, struct sctp_transport
, transports
);
547 if (del_timer(&t
->hb_timer
))
548 sctp_transport_put(t
);
552 /* Helper function to stop any pending T3-RTX timers */
553 static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t
*cmds
,
554 struct sctp_association
*asoc
)
556 struct sctp_transport
*t
;
557 struct list_head
*pos
;
559 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
560 t
= list_entry(pos
, struct sctp_transport
, transports
);
561 if (timer_pending(&t
->T3_rtx_timer
) &&
562 del_timer(&t
->T3_rtx_timer
)) {
563 sctp_transport_put(t
);
569 /* Helper function to update the heartbeat timer. */
570 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t
*cmds
,
571 struct sctp_association
*asoc
,
572 struct sctp_transport
*t
)
574 /* Update the heartbeat timer. */
575 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
576 sctp_transport_hold(t
);
579 /* Helper function to handle the reception of an HEARTBEAT ACK. */
580 static void sctp_cmd_transport_on(sctp_cmd_seq_t
*cmds
,
581 struct sctp_association
*asoc
,
582 struct sctp_transport
*t
,
583 struct sctp_chunk
*chunk
)
585 sctp_sender_hb_info_t
*hbinfo
;
587 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
588 * HEARTBEAT should clear the error counter of the destination
589 * transport address to which the HEARTBEAT was sent.
590 * The association's overall error count is also cleared.
593 t
->asoc
->overall_error_count
= 0;
595 /* Mark the destination transport address as active if it is not so
598 if (t
->state
== SCTP_INACTIVE
)
599 sctp_assoc_control_transport(asoc
, t
, SCTP_TRANSPORT_UP
,
600 SCTP_HEARTBEAT_SUCCESS
);
602 /* The receiver of the HEARTBEAT ACK should also perform an
603 * RTT measurement for that destination transport address
604 * using the time value carried in the HEARTBEAT ACK chunk.
606 hbinfo
= (sctp_sender_hb_info_t
*) chunk
->skb
->data
;
607 sctp_transport_update_rto(t
, (jiffies
- hbinfo
->sent_at
));
610 /* Helper function to do a transport reset at the expiry of the hearbeat
613 static void sctp_cmd_transport_reset(sctp_cmd_seq_t
*cmds
,
614 struct sctp_association
*asoc
,
615 struct sctp_transport
*t
)
617 sctp_transport_lower_cwnd(t
, SCTP_LOWER_CWND_INACTIVE
);
619 /* Mark one strike against a transport. */
620 sctp_do_8_2_transport_strike(asoc
, t
);
623 /* Helper function to process the process SACK command. */
624 static int sctp_cmd_process_sack(sctp_cmd_seq_t
*cmds
,
625 struct sctp_association
*asoc
,
626 struct sctp_sackhdr
*sackh
)
630 if (sctp_outq_sack(&asoc
->outqueue
, sackh
)) {
631 /* There are no more TSNs awaiting SACK. */
632 err
= sctp_do_sm(SCTP_EVENT_T_OTHER
,
633 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN
),
634 asoc
->state
, asoc
->ep
, asoc
, NULL
,
637 /* Windows may have opened, so we need
638 * to check if we have DATA to transmit
640 err
= sctp_outq_flush(&asoc
->outqueue
, 0);
646 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
647 * the transport for a shutdown chunk.
649 static void sctp_cmd_setup_t2(sctp_cmd_seq_t
*cmds
,
650 struct sctp_association
*asoc
,
651 struct sctp_chunk
*chunk
)
653 struct sctp_transport
*t
;
655 t
= sctp_assoc_choose_shutdown_transport(asoc
);
656 asoc
->shutdown_last_sent_to
= t
;
657 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
] = t
->rto
;
658 chunk
->transport
= t
;
661 /* Helper function to change the state of an association. */
662 static void sctp_cmd_new_state(sctp_cmd_seq_t
*cmds
,
663 struct sctp_association
*asoc
,
666 struct sock
*sk
= asoc
->base
.sk
;
670 SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n",
671 asoc
, sctp_state_tbl
[state
]);
673 if (sctp_style(sk
, TCP
)) {
674 /* Change the sk->sk_state of a TCP-style socket that has
675 * sucessfully completed a connect() call.
677 if (sctp_state(asoc
, ESTABLISHED
) && sctp_sstate(sk
, CLOSED
))
678 sk
->sk_state
= SCTP_SS_ESTABLISHED
;
680 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
681 if (sctp_state(asoc
, SHUTDOWN_RECEIVED
) &&
682 sctp_sstate(sk
, ESTABLISHED
))
683 sk
->sk_shutdown
|= RCV_SHUTDOWN
;
686 if (sctp_state(asoc
, COOKIE_WAIT
)) {
687 /* Reset init timeouts since they may have been
688 * increased due to timer expirations.
690 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] =
691 asoc
->ep
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
];
692 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] =
693 asoc
->ep
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
];
696 if (sctp_state(asoc
, ESTABLISHED
) ||
697 sctp_state(asoc
, CLOSED
) ||
698 sctp_state(asoc
, SHUTDOWN_RECEIVED
)) {
699 /* Wake up any processes waiting in the asoc's wait queue in
700 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
702 if (waitqueue_active(&asoc
->wait
))
703 wake_up_interruptible(&asoc
->wait
);
705 /* Wake up any processes waiting in the sk's sleep queue of
706 * a TCP-style or UDP-style peeled-off socket in
707 * sctp_wait_for_accept() or sctp_wait_for_packet().
708 * For a UDP-style socket, the waiters are woken up by the
711 if (!sctp_style(sk
, UDP
))
712 sk
->sk_state_change(sk
);
716 /* Helper function to delete an association. */
717 static void sctp_cmd_delete_tcb(sctp_cmd_seq_t
*cmds
,
718 struct sctp_association
*asoc
)
720 struct sock
*sk
= asoc
->base
.sk
;
722 /* If it is a non-temporary association belonging to a TCP-style
723 * listening socket that is not closed, do not free it so that accept()
724 * can pick it up later.
726 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
) &&
727 (!asoc
->temp
) && (sk
->sk_shutdown
!= SHUTDOWN_MASK
))
730 sctp_unhash_established(asoc
);
731 sctp_association_free(asoc
);
735 * ADDIP Section 4.1 ASCONF Chunk Procedures
736 * A4) Start a T-4 RTO timer, using the RTO value of the selected
737 * destination address (we use active path instead of primary path just
738 * because primary path may be inactive.
740 static void sctp_cmd_setup_t4(sctp_cmd_seq_t
*cmds
,
741 struct sctp_association
*asoc
,
742 struct sctp_chunk
*chunk
)
744 struct sctp_transport
*t
;
746 t
= asoc
->peer
.active_path
;
747 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T4_RTO
] = t
->rto
;
748 chunk
->transport
= t
;
751 /* Process an incoming Operation Error Chunk. */
752 static void sctp_cmd_process_operr(sctp_cmd_seq_t
*cmds
,
753 struct sctp_association
*asoc
,
754 struct sctp_chunk
*chunk
)
756 struct sctp_operr_chunk
*operr_chunk
;
757 struct sctp_errhdr
*err_hdr
;
759 operr_chunk
= (struct sctp_operr_chunk
*)chunk
->chunk_hdr
;
760 err_hdr
= &operr_chunk
->err_hdr
;
762 switch (err_hdr
->cause
) {
763 case SCTP_ERROR_UNKNOWN_CHUNK
:
765 struct sctp_chunkhdr
*unk_chunk_hdr
;
767 unk_chunk_hdr
= (struct sctp_chunkhdr
*)err_hdr
->variable
;
768 switch (unk_chunk_hdr
->type
) {
769 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with an
770 * ERROR chunk reporting that it did not recognized the ASCONF
771 * chunk type, the sender of the ASCONF MUST NOT send any
772 * further ASCONF chunks and MUST stop its T-4 timer.
774 case SCTP_CID_ASCONF
:
775 asoc
->peer
.asconf_capable
= 0;
776 sctp_add_cmd_sf(cmds
, SCTP_CMD_TIMER_STOP
,
777 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO
));
789 /* Process variable FWDTSN chunk information. */
790 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq
*ulpq
,
791 struct sctp_chunk
*chunk
)
793 struct sctp_fwdtsn_skip
*skip
;
794 /* Walk through all the skipped SSNs */
795 sctp_walk_fwdtsn(skip
, chunk
) {
796 sctp_ulpq_skip(ulpq
, ntohs(skip
->stream
), ntohs(skip
->ssn
));
802 /* Helper function to remove the association non-primary peer
805 static void sctp_cmd_del_non_primary(struct sctp_association
*asoc
)
807 struct sctp_transport
*t
;
808 struct list_head
*pos
;
809 struct list_head
*temp
;
811 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
812 t
= list_entry(pos
, struct sctp_transport
, transports
);
813 if (!sctp_cmp_addr_exact(&t
->ipaddr
,
814 &asoc
->peer
.primary_addr
)) {
815 sctp_assoc_del_peer(asoc
, &t
->ipaddr
);
822 /* These three macros allow us to pull the debugging code out of the
823 * main flow of sctp_do_sm() to keep attention focused on the real
824 * functionality there.
827 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
828 "ep %p, %s, %s, asoc %p[%s], %s\n", \
829 ep, sctp_evttype_tbl[event_type], \
830 (*debug_fn)(subtype), asoc, \
831 sctp_state_tbl[state], state_fn->name)
834 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
835 "asoc %p, status: %s\n", \
836 asoc, sctp_status_tbl[status])
838 #define DEBUG_POST_SFX \
839 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
841 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
842 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
845 * This is the master state machine processing function.
847 * If you want to understand all of lksctp, this is a
848 * good place to start.
850 int sctp_do_sm(sctp_event_t event_type
, sctp_subtype_t subtype
,
852 struct sctp_endpoint
*ep
,
853 struct sctp_association
*asoc
,
857 sctp_cmd_seq_t commands
;
858 const sctp_sm_table_entry_t
*state_fn
;
859 sctp_disposition_t status
;
861 typedef const char *(printfn_t
)(sctp_subtype_t
);
863 static printfn_t
*table
[] = {
864 NULL
, sctp_cname
, sctp_tname
, sctp_oname
, sctp_pname
,
866 printfn_t
*debug_fn
__attribute__ ((unused
)) = table
[event_type
];
868 /* Look up the state function, run it, and then process the
869 * side effects. These three steps are the heart of lksctp.
871 state_fn
= sctp_sm_lookup_event(event_type
, state
, subtype
);
873 sctp_init_cmd_seq(&commands
);
876 status
= (*state_fn
->fn
)(ep
, asoc
, subtype
, event_arg
, &commands
);
879 error
= sctp_side_effects(event_type
, subtype
, state
,
880 ep
, asoc
, event_arg
, status
,
890 /*****************************************************************
891 * This the master state function side effect processing function.
892 *****************************************************************/
893 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
895 struct sctp_endpoint
*ep
,
896 struct sctp_association
*asoc
,
898 sctp_disposition_t status
,
899 sctp_cmd_seq_t
*commands
,
904 /* FIXME - Most of the dispositions left today would be categorized
905 * as "exceptional" dispositions. For those dispositions, it
906 * may not be proper to run through any of the commands at all.
907 * For example, the command interpreter might be run only with
908 * disposition SCTP_DISPOSITION_CONSUME.
910 if (0 != (error
= sctp_cmd_interpreter(event_type
, subtype
, state
,
917 case SCTP_DISPOSITION_DISCARD
:
918 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
919 "event_type %d, event_id %d\n",
920 state
, event_type
, subtype
.chunk
);
923 case SCTP_DISPOSITION_NOMEM
:
924 /* We ran out of memory, so we need to discard this
927 /* BUG--we should now recover some memory, probably by
933 case SCTP_DISPOSITION_DELETE_TCB
:
934 /* This should now be a command. */
937 case SCTP_DISPOSITION_CONSUME
:
938 case SCTP_DISPOSITION_ABORT
:
940 * We should no longer have much work to do here as the
941 * real work has been done as explicit commands above.
945 case SCTP_DISPOSITION_VIOLATION
:
946 printk(KERN_ERR
"sctp protocol violation state %d "
947 "chunkid %d\n", state
, subtype
.chunk
);
950 case SCTP_DISPOSITION_NOT_IMPL
:
951 printk(KERN_WARNING
"sctp unimplemented feature in state %d, "
952 "event_type %d, event_id %d\n",
953 state
, event_type
, subtype
.chunk
);
956 case SCTP_DISPOSITION_BUG
:
957 printk(KERN_ERR
"sctp bug in state %d, "
958 "event_type %d, event_id %d\n",
959 state
, event_type
, subtype
.chunk
);
964 printk(KERN_ERR
"sctp impossible disposition %d "
965 "in state %d, event_type %d, event_id %d\n",
966 status
, state
, event_type
, subtype
.chunk
);
975 /********************************************************************
976 * 2nd Level Abstractions
977 ********************************************************************/
979 /* This is the side-effect interpreter. */
980 static int sctp_cmd_interpreter(sctp_event_t event_type
,
981 sctp_subtype_t subtype
,
983 struct sctp_endpoint
*ep
,
984 struct sctp_association
*asoc
,
986 sctp_disposition_t status
,
987 sctp_cmd_seq_t
*commands
,
993 struct sctp_chunk
*new_obj
;
994 struct sctp_chunk
*chunk
= NULL
;
995 struct sctp_packet
*packet
;
996 struct list_head
*pos
;
997 struct timer_list
*timer
;
998 unsigned long timeout
;
999 struct sctp_transport
*t
;
1000 struct sctp_sackhdr sackh
;
1003 if (SCTP_EVENT_T_TIMEOUT
!= event_type
)
1004 chunk
= (struct sctp_chunk
*) event_arg
;
1006 /* Note: This whole file is a huge candidate for rework.
1007 * For example, each command could either have its own handler, so
1008 * the loop would look like:
1010 * cmd->handle(x, y, z)
1013 while (NULL
!= (cmd
= sctp_next_cmd(commands
))) {
1014 switch (cmd
->verb
) {
1019 case SCTP_CMD_NEW_ASOC
:
1020 /* Register a new association. */
1022 sctp_outq_uncork(&asoc
->outqueue
);
1025 asoc
= cmd
->obj
.ptr
;
1026 /* Register with the endpoint. */
1027 sctp_endpoint_add_asoc(ep
, asoc
);
1028 sctp_hash_established(asoc
);
1031 case SCTP_CMD_UPDATE_ASSOC
:
1032 sctp_assoc_update(asoc
, cmd
->obj
.ptr
);
1035 case SCTP_CMD_PURGE_OUTQUEUE
:
1036 sctp_outq_teardown(&asoc
->outqueue
);
1039 case SCTP_CMD_DELETE_TCB
:
1041 sctp_outq_uncork(&asoc
->outqueue
);
1044 /* Delete the current association. */
1045 sctp_cmd_delete_tcb(commands
, asoc
);
1049 case SCTP_CMD_NEW_STATE
:
1050 /* Enter a new state. */
1051 sctp_cmd_new_state(commands
, asoc
, cmd
->obj
.state
);
1054 case SCTP_CMD_REPORT_TSN
:
1055 /* Record the arrival of a TSN. */
1056 sctp_tsnmap_mark(&asoc
->peer
.tsn_map
, cmd
->obj
.u32
);
1059 case SCTP_CMD_REPORT_FWDTSN
:
1060 /* Move the Cumulattive TSN Ack ahead. */
1061 sctp_tsnmap_skip(&asoc
->peer
.tsn_map
, cmd
->obj
.u32
);
1063 /* Abort any in progress partial delivery. */
1064 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
1067 case SCTP_CMD_PROCESS_FWDTSN
:
1068 sctp_cmd_process_fwdtsn(&asoc
->ulpq
, cmd
->obj
.ptr
);
1071 case SCTP_CMD_GEN_SACK
:
1072 /* Generate a Selective ACK.
1073 * The argument tells us whether to just count
1074 * the packet and MAYBE generate a SACK, or
1077 force
= cmd
->obj
.i32
;
1078 error
= sctp_gen_sack(asoc
, force
, commands
);
1081 case SCTP_CMD_PROCESS_SACK
:
1082 /* Process an inbound SACK. */
1083 error
= sctp_cmd_process_sack(commands
, asoc
,
1087 case SCTP_CMD_GEN_INIT_ACK
:
1088 /* Generate an INIT ACK chunk. */
1089 new_obj
= sctp_make_init_ack(asoc
, chunk
, GFP_ATOMIC
,
1094 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1095 SCTP_CHUNK(new_obj
));
1098 case SCTP_CMD_PEER_INIT
:
1099 /* Process a unified INIT from the peer.
1100 * Note: Only used during INIT-ACK processing. If
1101 * there is an error just return to the outter
1102 * layer which will bail.
1104 error
= sctp_cmd_process_init(commands
, asoc
, chunk
,
1108 case SCTP_CMD_GEN_COOKIE_ECHO
:
1109 /* Generate a COOKIE ECHO chunk. */
1110 new_obj
= sctp_make_cookie_echo(asoc
, chunk
);
1113 sctp_chunk_free(cmd
->obj
.ptr
);
1116 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1117 SCTP_CHUNK(new_obj
));
1119 /* If there is an ERROR chunk to be sent along with
1120 * the COOKIE_ECHO, send it, too.
1123 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1124 SCTP_CHUNK(cmd
->obj
.ptr
));
1126 /* FIXME - Eventually come up with a cleaner way to
1127 * enabling COOKIE-ECHO + DATA bundling during
1128 * multihoming stale cookie scenarios, the following
1129 * command plays with asoc->peer.retran_path to
1130 * avoid the problem of sending the COOKIE-ECHO and
1131 * DATA in different paths, which could result
1132 * in the association being ABORTed if the DATA chunk
1133 * is processed first by the server. Checking the
1134 * init error counter simply causes this command
1135 * to be executed only during failed attempts of
1136 * association establishment.
1138 if ((asoc
->peer
.retran_path
!=
1139 asoc
->peer
.primary_path
) &&
1140 (asoc
->init_err_counter
> 0)) {
1141 sctp_add_cmd_sf(commands
,
1142 SCTP_CMD_FORCE_PRIM_RETRAN
,
1148 case SCTP_CMD_GEN_SHUTDOWN
:
1149 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1150 * Reset error counts.
1152 asoc
->overall_error_count
= 0;
1154 /* Generate a SHUTDOWN chunk. */
1155 new_obj
= sctp_make_shutdown(asoc
, chunk
);
1158 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1159 SCTP_CHUNK(new_obj
));
1162 case SCTP_CMD_CHUNK_ULP
:
1163 /* Send a chunk to the sockets layer. */
1164 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1165 "chunk_up:", cmd
->obj
.ptr
,
1166 "ulpq:", &asoc
->ulpq
);
1167 sctp_ulpq_tail_data(&asoc
->ulpq
, cmd
->obj
.ptr
,
1171 case SCTP_CMD_EVENT_ULP
:
1172 /* Send a notification to the sockets layer. */
1173 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1174 "event_up:",cmd
->obj
.ptr
,
1175 "ulpq:",&asoc
->ulpq
);
1176 sctp_ulpq_tail_event(&asoc
->ulpq
, cmd
->obj
.ptr
);
1179 case SCTP_CMD_REPLY
:
1180 /* If an caller has not already corked, do cork. */
1181 if (!asoc
->outqueue
.cork
) {
1182 sctp_outq_cork(&asoc
->outqueue
);
1185 /* Send a chunk to our peer. */
1186 error
= sctp_outq_tail(&asoc
->outqueue
, cmd
->obj
.ptr
);
1189 case SCTP_CMD_SEND_PKT
:
1190 /* Send a full packet to our peer. */
1191 packet
= cmd
->obj
.ptr
;
1192 sctp_packet_transmit(packet
);
1193 sctp_ootb_pkt_free(packet
);
1196 case SCTP_CMD_RETRAN
:
1197 /* Mark a transport for retransmission. */
1198 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1202 case SCTP_CMD_TRANSMIT
:
1203 /* Kick start transmission. */
1204 error
= sctp_outq_uncork(&asoc
->outqueue
);
1208 case SCTP_CMD_ECN_CE
:
1209 /* Do delayed CE processing. */
1210 sctp_do_ecn_ce_work(asoc
, cmd
->obj
.u32
);
1213 case SCTP_CMD_ECN_ECNE
:
1214 /* Do delayed ECNE processing. */
1215 new_obj
= sctp_do_ecn_ecne_work(asoc
, cmd
->obj
.u32
,
1218 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1219 SCTP_CHUNK(new_obj
));
1222 case SCTP_CMD_ECN_CWR
:
1223 /* Do delayed CWR processing. */
1224 sctp_do_ecn_cwr_work(asoc
, cmd
->obj
.u32
);
1227 case SCTP_CMD_SETUP_T2
:
1228 sctp_cmd_setup_t2(commands
, asoc
, cmd
->obj
.ptr
);
1231 case SCTP_CMD_TIMER_START
:
1232 timer
= &asoc
->timers
[cmd
->obj
.to
];
1233 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1237 timer
->expires
= jiffies
+ timeout
;
1238 sctp_association_hold(asoc
);
1242 case SCTP_CMD_TIMER_RESTART
:
1243 timer
= &asoc
->timers
[cmd
->obj
.to
];
1244 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1245 if (!mod_timer(timer
, jiffies
+ timeout
))
1246 sctp_association_hold(asoc
);
1249 case SCTP_CMD_TIMER_STOP
:
1250 timer
= &asoc
->timers
[cmd
->obj
.to
];
1251 if (timer_pending(timer
) && del_timer(timer
))
1252 sctp_association_put(asoc
);
1255 case SCTP_CMD_INIT_CHOOSE_TRANSPORT
:
1256 chunk
= cmd
->obj
.ptr
;
1257 t
= sctp_assoc_choose_init_transport(asoc
);
1258 asoc
->init_last_sent_to
= t
;
1259 chunk
->transport
= t
;
1260 t
->init_sent_count
++;
1263 case SCTP_CMD_INIT_RESTART
:
1264 /* Do the needed accounting and updates
1265 * associated with restarting an initialization
1266 * timer. Only multiply the timeout by two if
1267 * all transports have been tried at the current
1270 t
= asoc
->init_last_sent_to
;
1271 asoc
->init_err_counter
++;
1273 if (t
->init_sent_count
> (asoc
->init_cycle
+ 1)) {
1274 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] *= 2;
1275 if (asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] >
1276 asoc
->max_init_timeo
) {
1277 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] =
1278 asoc
->max_init_timeo
;
1282 "T1 INIT Timeout adjustment"
1283 " init_err_counter: %d"
1286 asoc
->init_err_counter
,
1288 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
]);
1291 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
1292 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT
));
1295 case SCTP_CMD_COOKIEECHO_RESTART
:
1296 /* Do the needed accounting and updates
1297 * associated with restarting an initialization
1298 * timer. Only multiply the timeout by two if
1299 * all transports have been tried at the current
1302 asoc
->init_err_counter
++;
1304 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] *= 2;
1305 if (asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] >
1306 asoc
->max_init_timeo
) {
1307 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] =
1308 asoc
->max_init_timeo
;
1311 "T1 COOKIE Timeout adjustment"
1312 " init_err_counter: %d"
1314 asoc
->init_err_counter
,
1315 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
]);
1317 /* If we've sent any data bundled with
1318 * COOKIE-ECHO we need to resend.
1320 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
1321 t
= list_entry(pos
, struct sctp_transport
,
1323 sctp_retransmit_mark(&asoc
->outqueue
, t
, 0);
1326 sctp_add_cmd_sf(commands
,
1327 SCTP_CMD_TIMER_RESTART
,
1328 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE
));
1331 case SCTP_CMD_INIT_FAILED
:
1332 sctp_cmd_init_failed(commands
, asoc
, cmd
->obj
.u32
);
1335 case SCTP_CMD_ASSOC_FAILED
:
1336 sctp_cmd_assoc_failed(commands
, asoc
, event_type
,
1337 subtype
, chunk
, cmd
->obj
.u32
);
1340 case SCTP_CMD_INIT_COUNTER_INC
:
1341 asoc
->init_err_counter
++;
1344 case SCTP_CMD_INIT_COUNTER_RESET
:
1345 asoc
->init_err_counter
= 0;
1346 asoc
->init_cycle
= 0;
1349 case SCTP_CMD_REPORT_DUP
:
1350 sctp_tsnmap_mark_dup(&asoc
->peer
.tsn_map
,
1354 case SCTP_CMD_REPORT_BAD_TAG
:
1355 SCTP_DEBUG_PRINTK("vtag mismatch!\n");
1358 case SCTP_CMD_STRIKE
:
1359 /* Mark one strike against a transport. */
1360 sctp_do_8_2_transport_strike(asoc
, cmd
->obj
.transport
);
1363 case SCTP_CMD_TRANSPORT_RESET
:
1364 t
= cmd
->obj
.transport
;
1365 sctp_cmd_transport_reset(commands
, asoc
, t
);
1368 case SCTP_CMD_TRANSPORT_ON
:
1369 t
= cmd
->obj
.transport
;
1370 sctp_cmd_transport_on(commands
, asoc
, t
, chunk
);
1373 case SCTP_CMD_HB_TIMERS_START
:
1374 sctp_cmd_hb_timers_start(commands
, asoc
);
1377 case SCTP_CMD_HB_TIMER_UPDATE
:
1378 t
= cmd
->obj
.transport
;
1379 sctp_cmd_hb_timer_update(commands
, asoc
, t
);
1382 case SCTP_CMD_HB_TIMERS_STOP
:
1383 sctp_cmd_hb_timers_stop(commands
, asoc
);
1386 case SCTP_CMD_REPORT_ERROR
:
1387 error
= cmd
->obj
.error
;
1390 case SCTP_CMD_PROCESS_CTSN
:
1391 /* Dummy up a SACK for processing. */
1392 sackh
.cum_tsn_ack
= cmd
->obj
.u32
;
1394 sackh
.num_gap_ack_blocks
= 0;
1395 sackh
.num_dup_tsns
= 0;
1396 sctp_add_cmd_sf(commands
, SCTP_CMD_PROCESS_SACK
,
1397 SCTP_SACKH(&sackh
));
1400 case SCTP_CMD_DISCARD_PACKET
:
1401 /* We need to discard the whole packet. */
1402 chunk
->pdiscard
= 1;
1405 case SCTP_CMD_RTO_PENDING
:
1406 t
= cmd
->obj
.transport
;
1410 case SCTP_CMD_PART_DELIVER
:
1411 sctp_ulpq_partial_delivery(&asoc
->ulpq
, cmd
->obj
.ptr
,
1415 case SCTP_CMD_RENEGE
:
1416 sctp_ulpq_renege(&asoc
->ulpq
, cmd
->obj
.ptr
,
1420 case SCTP_CMD_SETUP_T4
:
1421 sctp_cmd_setup_t4(commands
, asoc
, cmd
->obj
.ptr
);
1424 case SCTP_CMD_PROCESS_OPERR
:
1425 sctp_cmd_process_operr(commands
, asoc
, chunk
);
1427 case SCTP_CMD_CLEAR_INIT_TAG
:
1428 asoc
->peer
.i
.init_tag
= 0;
1430 case SCTP_CMD_DEL_NON_PRIMARY
:
1431 sctp_cmd_del_non_primary(asoc
);
1433 case SCTP_CMD_T3_RTX_TIMERS_STOP
:
1434 sctp_cmd_t3_rtx_timers_stop(commands
, asoc
);
1436 case SCTP_CMD_FORCE_PRIM_RETRAN
:
1437 t
= asoc
->peer
.retran_path
;
1438 asoc
->peer
.retran_path
= asoc
->peer
.primary_path
;
1439 error
= sctp_outq_uncork(&asoc
->outqueue
);
1441 asoc
->peer
.retran_path
= t
;
1444 printk(KERN_WARNING
"Impossible command: %u, %p\n",
1445 cmd
->verb
, cmd
->obj
.ptr
);
1454 sctp_outq_uncork(&asoc
->outqueue
);