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 #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
;
160 struct sctp_transport
*trans
= asoc
->peer
.last_data_from
;
164 (!trans
&& (asoc
->param_flags
& SPP_SACKDELAY_DISABLE
)) ||
165 (trans
&& (trans
->param_flags
& SPP_SACKDELAY_DISABLE
)))
166 asoc
->peer
.sack_needed
= 1;
168 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
169 max_tsn_seen
= sctp_tsnmap_get_max_tsn_seen(&asoc
->peer
.tsn_map
);
171 /* From 12.2 Parameters necessary per association (i.e. the TCB):
173 * Ack State : This flag indicates if the next received packet
174 * : is to be responded to with a SACK. ...
175 * : When DATA chunks are out of order, SACK's
176 * : are not delayed (see Section 6).
178 * [This is actually not mentioned in Section 6, but we
179 * implement it here anyway. --piggy]
181 if (max_tsn_seen
!= ctsn
)
182 asoc
->peer
.sack_needed
= 1;
184 /* From 6.2 Acknowledgement on Reception of DATA Chunks:
186 * Section 4.2 of [RFC2581] SHOULD be followed. Specifically,
187 * an acknowledgement SHOULD be generated for at least every
188 * second packet (not every second DATA chunk) received, and
189 * SHOULD be generated within 200 ms of the arrival of any
190 * unacknowledged DATA chunk. ...
192 if (!asoc
->peer
.sack_needed
) {
193 /* We will need a SACK for the next packet. */
194 asoc
->peer
.sack_needed
= 1;
196 /* Set the SACK delay timeout based on the
197 * SACK delay for the last transport
198 * data was received from, or the default
199 * for the association.
202 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
205 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
208 /* Restart the SACK timer. */
209 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
210 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
212 if (asoc
->a_rwnd
> asoc
->rwnd
)
213 asoc
->a_rwnd
= asoc
->rwnd
;
214 sack
= sctp_make_sack(asoc
);
218 asoc
->peer
.sack_needed
= 0;
220 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
, SCTP_CHUNK(sack
));
222 /* Stop the SACK timer. */
223 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_STOP
,
224 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
233 /* When the T3-RTX timer expires, it calls this function to create the
234 * relevant state machine event.
236 void sctp_generate_t3_rtx_event(unsigned long peer
)
239 struct sctp_transport
*transport
= (struct sctp_transport
*) peer
;
240 struct sctp_association
*asoc
= transport
->asoc
;
242 /* Check whether a task is in the sock. */
244 sctp_bh_lock_sock(asoc
->base
.sk
);
245 if (sock_owned_by_user(asoc
->base
.sk
)) {
246 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __FUNCTION__
);
248 /* Try again later. */
249 if (!mod_timer(&transport
->T3_rtx_timer
, jiffies
+ (HZ
/20)))
250 sctp_transport_hold(transport
);
254 /* Is this transport really dead and just waiting around for
255 * the timer to let go of the reference?
260 /* Run through the state machine. */
261 error
= sctp_do_sm(SCTP_EVENT_T_TIMEOUT
,
262 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX
),
265 transport
, GFP_ATOMIC
);
268 asoc
->base
.sk
->sk_err
= -error
;
271 sctp_bh_unlock_sock(asoc
->base
.sk
);
272 sctp_transport_put(transport
);
275 /* This is a sa interface for producing timeout events. It works
276 * for timeouts which use the association as their parameter.
278 static void sctp_generate_timeout_event(struct sctp_association
*asoc
,
279 sctp_event_timeout_t timeout_type
)
283 sctp_bh_lock_sock(asoc
->base
.sk
);
284 if (sock_owned_by_user(asoc
->base
.sk
)) {
285 SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n",
289 /* Try again later. */
290 if (!mod_timer(&asoc
->timers
[timeout_type
], jiffies
+ (HZ
/20)))
291 sctp_association_hold(asoc
);
295 /* Is this association really dead and just waiting around for
296 * the timer to let go of the reference?
301 /* Run through the state machine. */
302 error
= sctp_do_sm(SCTP_EVENT_T_TIMEOUT
,
303 SCTP_ST_TIMEOUT(timeout_type
),
304 asoc
->state
, asoc
->ep
, asoc
,
305 (void *)timeout_type
, GFP_ATOMIC
);
308 asoc
->base
.sk
->sk_err
= -error
;
311 sctp_bh_unlock_sock(asoc
->base
.sk
);
312 sctp_association_put(asoc
);
315 static void sctp_generate_t1_cookie_event(unsigned long data
)
317 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
318 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_COOKIE
);
321 static void sctp_generate_t1_init_event(unsigned long data
)
323 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
324 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_INIT
);
327 static void sctp_generate_t2_shutdown_event(unsigned long data
)
329 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
330 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
);
333 static void sctp_generate_t4_rto_event(unsigned long data
)
335 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
336 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T4_RTO
);
339 static void sctp_generate_t5_shutdown_guard_event(unsigned long data
)
341 struct sctp_association
*asoc
= (struct sctp_association
*)data
;
342 sctp_generate_timeout_event(asoc
,
343 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD
);
345 } /* sctp_generate_t5_shutdown_guard_event() */
347 static void sctp_generate_autoclose_event(unsigned long data
)
349 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
350 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_AUTOCLOSE
);
353 /* Generate a heart beat event. If the sock is busy, reschedule. Make
354 * sure that the transport is still valid.
356 void sctp_generate_heartbeat_event(unsigned long data
)
359 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
360 struct sctp_association
*asoc
= transport
->asoc
;
362 sctp_bh_lock_sock(asoc
->base
.sk
);
363 if (sock_owned_by_user(asoc
->base
.sk
)) {
364 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __FUNCTION__
);
366 /* Try again later. */
367 if (!mod_timer(&transport
->hb_timer
, jiffies
+ (HZ
/20)))
368 sctp_transport_hold(transport
);
372 /* Is this structure just waiting around for us to actually
378 error
= sctp_do_sm(SCTP_EVENT_T_TIMEOUT
,
379 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT
),
380 asoc
->state
, asoc
->ep
, asoc
,
381 transport
, GFP_ATOMIC
);
384 asoc
->base
.sk
->sk_err
= -error
;
387 sctp_bh_unlock_sock(asoc
->base
.sk
);
388 sctp_transport_put(transport
);
391 /* Inject a SACK Timeout event into the state machine. */
392 static void sctp_generate_sack_event(unsigned long data
)
394 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
395 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_SACK
);
398 sctp_timer_event_t
*sctp_timer_events
[SCTP_NUM_TIMEOUT_TYPES
] = {
400 sctp_generate_t1_cookie_event
,
401 sctp_generate_t1_init_event
,
402 sctp_generate_t2_shutdown_event
,
404 sctp_generate_t4_rto_event
,
405 sctp_generate_t5_shutdown_guard_event
,
407 sctp_generate_sack_event
,
408 sctp_generate_autoclose_event
,
412 /* RFC 2960 8.2 Path Failure Detection
414 * When its peer endpoint is multi-homed, an endpoint should keep a
415 * error counter for each of the destination transport addresses of the
418 * Each time the T3-rtx timer expires on any address, or when a
419 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
420 * the error counter of that destination address will be incremented.
421 * When the value in the error counter exceeds the protocol parameter
422 * 'Path.Max.Retrans' of that destination address, the endpoint should
423 * mark the destination transport address as inactive, and a
424 * notification SHOULD be sent to the upper layer.
427 static void sctp_do_8_2_transport_strike(struct sctp_association
*asoc
,
428 struct sctp_transport
*transport
)
430 /* The check for association's overall error counter exceeding the
431 * threshold is done in the state function.
433 /* When probing UNCONFIRMED addresses, the association overall
434 * error count is NOT incremented
436 if (transport
->state
!= SCTP_UNCONFIRMED
)
437 asoc
->overall_error_count
++;
439 if (transport
->state
!= SCTP_INACTIVE
&&
440 (transport
->error_count
++ >= transport
->pathmaxrxt
)) {
441 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
442 " transport IP: port:%d failed.\n",
444 (&transport
->ipaddr
),
445 ntohs(transport
->ipaddr
.v4
.sin_port
));
446 sctp_assoc_control_transport(asoc
, transport
,
448 SCTP_FAILED_THRESHOLD
);
451 /* E2) For the destination address for which the timer
452 * expires, set RTO <- RTO * 2 ("back off the timer"). The
453 * maximum value discussed in rule C7 above (RTO.max) may be
454 * used to provide an upper bound to this doubling operation.
456 transport
->last_rto
= transport
->rto
;
457 transport
->rto
= min((transport
->rto
* 2), transport
->asoc
->rto_max
);
460 /* Worker routine to handle INIT command failure. */
461 static void sctp_cmd_init_failed(sctp_cmd_seq_t
*commands
,
462 struct sctp_association
*asoc
,
465 struct sctp_ulpevent
*event
;
467 event
= sctp_ulpevent_make_assoc_change(asoc
,0, SCTP_CANT_STR_ASSOC
,
468 (__u16
)error
, 0, 0, NULL
,
472 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
473 SCTP_ULPEVENT(event
));
475 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
476 SCTP_STATE(SCTP_STATE_CLOSED
));
478 /* SEND_FAILED sent later when cleaning up the association. */
479 asoc
->outqueue
.error
= error
;
480 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
483 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
484 static void sctp_cmd_assoc_failed(sctp_cmd_seq_t
*commands
,
485 struct sctp_association
*asoc
,
486 sctp_event_t event_type
,
487 sctp_subtype_t subtype
,
488 struct sctp_chunk
*chunk
,
491 struct sctp_ulpevent
*event
;
493 /* Cancel any partial delivery in progress. */
494 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
496 if (event_type
== SCTP_EVENT_T_CHUNK
&& subtype
.chunk
== SCTP_CID_ABORT
)
497 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
498 (__u16
)error
, 0, 0, chunk
,
501 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
502 (__u16
)error
, 0, 0, NULL
,
505 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
506 SCTP_ULPEVENT(event
));
508 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
509 SCTP_STATE(SCTP_STATE_CLOSED
));
511 /* SEND_FAILED sent later when cleaning up the association. */
512 asoc
->outqueue
.error
= error
;
513 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
516 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
517 * inside the cookie. In reality, this is only used for INIT-ACK processing
518 * since all other cases use "temporary" associations and can do all
519 * their work in statefuns directly.
521 static int sctp_cmd_process_init(sctp_cmd_seq_t
*commands
,
522 struct sctp_association
*asoc
,
523 struct sctp_chunk
*chunk
,
524 sctp_init_chunk_t
*peer_init
,
529 /* We only process the init as a sideeffect in a single
530 * case. This is when we process the INIT-ACK. If we
531 * fail during INIT processing (due to malloc problems),
532 * just return the error and stop processing the stack.
534 if (!sctp_process_init(asoc
, chunk
->chunk_hdr
->type
,
535 sctp_source(chunk
), peer_init
, gfp
))
543 /* Helper function to break out starting up of heartbeat timers. */
544 static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t
*cmds
,
545 struct sctp_association
*asoc
)
547 struct sctp_transport
*t
;
548 struct list_head
*pos
;
550 /* Start a heartbeat timer for each transport on the association.
551 * hold a reference on the transport to make sure none of
552 * the needed data structures go away.
554 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
555 t
= list_entry(pos
, struct sctp_transport
, transports
);
557 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
558 sctp_transport_hold(t
);
562 static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t
*cmds
,
563 struct sctp_association
*asoc
)
565 struct sctp_transport
*t
;
566 struct list_head
*pos
;
568 /* Stop all heartbeat timers. */
570 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
571 t
= list_entry(pos
, struct sctp_transport
, transports
);
572 if (del_timer(&t
->hb_timer
))
573 sctp_transport_put(t
);
577 /* Helper function to stop any pending T3-RTX timers */
578 static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t
*cmds
,
579 struct sctp_association
*asoc
)
581 struct sctp_transport
*t
;
582 struct list_head
*pos
;
584 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
585 t
= list_entry(pos
, struct sctp_transport
, transports
);
586 if (timer_pending(&t
->T3_rtx_timer
) &&
587 del_timer(&t
->T3_rtx_timer
)) {
588 sctp_transport_put(t
);
594 /* Helper function to update the heartbeat timer. */
595 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t
*cmds
,
596 struct sctp_association
*asoc
,
597 struct sctp_transport
*t
)
599 /* Update the heartbeat timer. */
600 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
601 sctp_transport_hold(t
);
604 /* Helper function to handle the reception of an HEARTBEAT ACK. */
605 static void sctp_cmd_transport_on(sctp_cmd_seq_t
*cmds
,
606 struct sctp_association
*asoc
,
607 struct sctp_transport
*t
,
608 struct sctp_chunk
*chunk
)
610 sctp_sender_hb_info_t
*hbinfo
;
612 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
613 * HEARTBEAT should clear the error counter of the destination
614 * transport address to which the HEARTBEAT was sent.
615 * The association's overall error count is also cleared.
618 t
->asoc
->overall_error_count
= 0;
620 /* Mark the destination transport address as active if it is not so
623 if ((t
->state
== SCTP_INACTIVE
) || (t
->state
== SCTP_UNCONFIRMED
))
624 sctp_assoc_control_transport(asoc
, t
, SCTP_TRANSPORT_UP
,
625 SCTP_HEARTBEAT_SUCCESS
);
627 /* The receiver of the HEARTBEAT ACK should also perform an
628 * RTT measurement for that destination transport address
629 * using the time value carried in the HEARTBEAT ACK chunk.
630 * If the transport's rto_pending variable has been cleared,
631 * it was most likely due to a retransmit. However, we want
632 * to re-enable it to properly update the rto.
634 if (t
->rto_pending
== 0)
637 hbinfo
= (sctp_sender_hb_info_t
*) chunk
->skb
->data
;
638 sctp_transport_update_rto(t
, (jiffies
- hbinfo
->sent_at
));
640 /* Update the heartbeat timer. */
641 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
642 sctp_transport_hold(t
);
645 /* Helper function to do a transport reset at the expiry of the hearbeat
648 static void sctp_cmd_transport_reset(sctp_cmd_seq_t
*cmds
,
649 struct sctp_association
*asoc
,
650 struct sctp_transport
*t
)
652 sctp_transport_lower_cwnd(t
, SCTP_LOWER_CWND_INACTIVE
);
654 /* Mark one strike against a transport. */
655 sctp_do_8_2_transport_strike(asoc
, t
);
658 /* Helper function to process the process SACK command. */
659 static int sctp_cmd_process_sack(sctp_cmd_seq_t
*cmds
,
660 struct sctp_association
*asoc
,
661 struct sctp_sackhdr
*sackh
)
665 if (sctp_outq_sack(&asoc
->outqueue
, sackh
)) {
666 /* There are no more TSNs awaiting SACK. */
667 err
= sctp_do_sm(SCTP_EVENT_T_OTHER
,
668 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN
),
669 asoc
->state
, asoc
->ep
, asoc
, NULL
,
672 /* Windows may have opened, so we need
673 * to check if we have DATA to transmit
675 err
= sctp_outq_flush(&asoc
->outqueue
, 0);
681 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
682 * the transport for a shutdown chunk.
684 static void sctp_cmd_setup_t2(sctp_cmd_seq_t
*cmds
,
685 struct sctp_association
*asoc
,
686 struct sctp_chunk
*chunk
)
688 struct sctp_transport
*t
;
690 t
= sctp_assoc_choose_shutdown_transport(asoc
);
691 asoc
->shutdown_last_sent_to
= t
;
692 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
] = t
->rto
;
693 chunk
->transport
= t
;
696 /* Helper function to change the state of an association. */
697 static void sctp_cmd_new_state(sctp_cmd_seq_t
*cmds
,
698 struct sctp_association
*asoc
,
701 struct sock
*sk
= asoc
->base
.sk
;
705 SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n",
706 asoc
, sctp_state_tbl
[state
]);
708 if (sctp_style(sk
, TCP
)) {
709 /* Change the sk->sk_state of a TCP-style socket that has
710 * sucessfully completed a connect() call.
712 if (sctp_state(asoc
, ESTABLISHED
) && sctp_sstate(sk
, CLOSED
))
713 sk
->sk_state
= SCTP_SS_ESTABLISHED
;
715 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
716 if (sctp_state(asoc
, SHUTDOWN_RECEIVED
) &&
717 sctp_sstate(sk
, ESTABLISHED
))
718 sk
->sk_shutdown
|= RCV_SHUTDOWN
;
721 if (sctp_state(asoc
, COOKIE_WAIT
)) {
722 /* Reset init timeouts since they may have been
723 * increased due to timer expirations.
725 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] =
727 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] =
731 if (sctp_state(asoc
, ESTABLISHED
) ||
732 sctp_state(asoc
, CLOSED
) ||
733 sctp_state(asoc
, SHUTDOWN_RECEIVED
)) {
734 /* Wake up any processes waiting in the asoc's wait queue in
735 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
737 if (waitqueue_active(&asoc
->wait
))
738 wake_up_interruptible(&asoc
->wait
);
740 /* Wake up any processes waiting in the sk's sleep queue of
741 * a TCP-style or UDP-style peeled-off socket in
742 * sctp_wait_for_accept() or sctp_wait_for_packet().
743 * For a UDP-style socket, the waiters are woken up by the
746 if (!sctp_style(sk
, UDP
))
747 sk
->sk_state_change(sk
);
751 /* Helper function to delete an association. */
752 static void sctp_cmd_delete_tcb(sctp_cmd_seq_t
*cmds
,
753 struct sctp_association
*asoc
)
755 struct sock
*sk
= asoc
->base
.sk
;
757 /* If it is a non-temporary association belonging to a TCP-style
758 * listening socket that is not closed, do not free it so that accept()
759 * can pick it up later.
761 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
) &&
762 (!asoc
->temp
) && (sk
->sk_shutdown
!= SHUTDOWN_MASK
))
765 sctp_unhash_established(asoc
);
766 sctp_association_free(asoc
);
770 * ADDIP Section 4.1 ASCONF Chunk Procedures
771 * A4) Start a T-4 RTO timer, using the RTO value of the selected
772 * destination address (we use active path instead of primary path just
773 * because primary path may be inactive.
775 static void sctp_cmd_setup_t4(sctp_cmd_seq_t
*cmds
,
776 struct sctp_association
*asoc
,
777 struct sctp_chunk
*chunk
)
779 struct sctp_transport
*t
;
781 t
= asoc
->peer
.active_path
;
782 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T4_RTO
] = t
->rto
;
783 chunk
->transport
= t
;
786 /* Process an incoming Operation Error Chunk. */
787 static void sctp_cmd_process_operr(sctp_cmd_seq_t
*cmds
,
788 struct sctp_association
*asoc
,
789 struct sctp_chunk
*chunk
)
791 struct sctp_operr_chunk
*operr_chunk
;
792 struct sctp_errhdr
*err_hdr
;
794 operr_chunk
= (struct sctp_operr_chunk
*)chunk
->chunk_hdr
;
795 err_hdr
= &operr_chunk
->err_hdr
;
797 switch (err_hdr
->cause
) {
798 case SCTP_ERROR_UNKNOWN_CHUNK
:
800 struct sctp_chunkhdr
*unk_chunk_hdr
;
802 unk_chunk_hdr
= (struct sctp_chunkhdr
*)err_hdr
->variable
;
803 switch (unk_chunk_hdr
->type
) {
804 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with an
805 * ERROR chunk reporting that it did not recognized the ASCONF
806 * chunk type, the sender of the ASCONF MUST NOT send any
807 * further ASCONF chunks and MUST stop its T-4 timer.
809 case SCTP_CID_ASCONF
:
810 asoc
->peer
.asconf_capable
= 0;
811 sctp_add_cmd_sf(cmds
, SCTP_CMD_TIMER_STOP
,
812 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO
));
824 /* Process variable FWDTSN chunk information. */
825 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq
*ulpq
,
826 struct sctp_chunk
*chunk
)
828 struct sctp_fwdtsn_skip
*skip
;
829 /* Walk through all the skipped SSNs */
830 sctp_walk_fwdtsn(skip
, chunk
) {
831 sctp_ulpq_skip(ulpq
, ntohs(skip
->stream
), ntohs(skip
->ssn
));
837 /* Helper function to remove the association non-primary peer
840 static void sctp_cmd_del_non_primary(struct sctp_association
*asoc
)
842 struct sctp_transport
*t
;
843 struct list_head
*pos
;
844 struct list_head
*temp
;
846 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
847 t
= list_entry(pos
, struct sctp_transport
, transports
);
848 if (!sctp_cmp_addr_exact(&t
->ipaddr
,
849 &asoc
->peer
.primary_addr
)) {
850 sctp_assoc_del_peer(asoc
, &t
->ipaddr
);
857 /* Helper function to set sk_err on a 1-1 style socket. */
858 static void sctp_cmd_set_sk_err(struct sctp_association
*asoc
, int error
)
860 struct sock
*sk
= asoc
->base
.sk
;
862 if (!sctp_style(sk
, UDP
))
866 /* Helper function to generate an association change event */
867 static void sctp_cmd_assoc_change(sctp_cmd_seq_t
*commands
,
868 struct sctp_association
*asoc
,
871 struct sctp_ulpevent
*ev
;
873 ev
= sctp_ulpevent_make_assoc_change(asoc
, 0, state
, 0,
874 asoc
->c
.sinit_num_ostreams
,
875 asoc
->c
.sinit_max_instreams
,
878 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
881 /* Helper function to generate an adaptation indication event */
882 static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t
*commands
,
883 struct sctp_association
*asoc
)
885 struct sctp_ulpevent
*ev
;
887 ev
= sctp_ulpevent_make_adaptation_indication(asoc
, GFP_ATOMIC
);
890 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
893 /* These three macros allow us to pull the debugging code out of the
894 * main flow of sctp_do_sm() to keep attention focused on the real
895 * functionality there.
898 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
899 "ep %p, %s, %s, asoc %p[%s], %s\n", \
900 ep, sctp_evttype_tbl[event_type], \
901 (*debug_fn)(subtype), asoc, \
902 sctp_state_tbl[state], state_fn->name)
905 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
906 "asoc %p, status: %s\n", \
907 asoc, sctp_status_tbl[status])
909 #define DEBUG_POST_SFX \
910 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
912 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
913 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
916 * This is the master state machine processing function.
918 * If you want to understand all of lksctp, this is a
919 * good place to start.
921 int sctp_do_sm(sctp_event_t event_type
, sctp_subtype_t subtype
,
923 struct sctp_endpoint
*ep
,
924 struct sctp_association
*asoc
,
928 sctp_cmd_seq_t commands
;
929 const sctp_sm_table_entry_t
*state_fn
;
930 sctp_disposition_t status
;
932 typedef const char *(printfn_t
)(sctp_subtype_t
);
934 static printfn_t
*table
[] = {
935 NULL
, sctp_cname
, sctp_tname
, sctp_oname
, sctp_pname
,
937 printfn_t
*debug_fn
__attribute__ ((unused
)) = table
[event_type
];
939 /* Look up the state function, run it, and then process the
940 * side effects. These three steps are the heart of lksctp.
942 state_fn
= sctp_sm_lookup_event(event_type
, state
, subtype
);
944 sctp_init_cmd_seq(&commands
);
947 status
= (*state_fn
->fn
)(ep
, asoc
, subtype
, event_arg
, &commands
);
950 error
= sctp_side_effects(event_type
, subtype
, state
,
951 ep
, asoc
, event_arg
, status
,
961 /*****************************************************************
962 * This the master state function side effect processing function.
963 *****************************************************************/
964 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
966 struct sctp_endpoint
*ep
,
967 struct sctp_association
*asoc
,
969 sctp_disposition_t status
,
970 sctp_cmd_seq_t
*commands
,
975 /* FIXME - Most of the dispositions left today would be categorized
976 * as "exceptional" dispositions. For those dispositions, it
977 * may not be proper to run through any of the commands at all.
978 * For example, the command interpreter might be run only with
979 * disposition SCTP_DISPOSITION_CONSUME.
981 if (0 != (error
= sctp_cmd_interpreter(event_type
, subtype
, state
,
988 case SCTP_DISPOSITION_DISCARD
:
989 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
990 "event_type %d, event_id %d\n",
991 state
, event_type
, subtype
.chunk
);
994 case SCTP_DISPOSITION_NOMEM
:
995 /* We ran out of memory, so we need to discard this
998 /* BUG--we should now recover some memory, probably by
1004 case SCTP_DISPOSITION_DELETE_TCB
:
1005 /* This should now be a command. */
1008 case SCTP_DISPOSITION_CONSUME
:
1009 case SCTP_DISPOSITION_ABORT
:
1011 * We should no longer have much work to do here as the
1012 * real work has been done as explicit commands above.
1016 case SCTP_DISPOSITION_VIOLATION
:
1017 if (net_ratelimit())
1018 printk(KERN_ERR
"sctp protocol violation state %d "
1019 "chunkid %d\n", state
, subtype
.chunk
);
1022 case SCTP_DISPOSITION_NOT_IMPL
:
1023 printk(KERN_WARNING
"sctp unimplemented feature in state %d, "
1024 "event_type %d, event_id %d\n",
1025 state
, event_type
, subtype
.chunk
);
1028 case SCTP_DISPOSITION_BUG
:
1029 printk(KERN_ERR
"sctp bug in state %d, "
1030 "event_type %d, event_id %d\n",
1031 state
, event_type
, subtype
.chunk
);
1036 printk(KERN_ERR
"sctp impossible disposition %d "
1037 "in state %d, event_type %d, event_id %d\n",
1038 status
, state
, event_type
, subtype
.chunk
);
1047 /********************************************************************
1048 * 2nd Level Abstractions
1049 ********************************************************************/
1051 /* This is the side-effect interpreter. */
1052 static int sctp_cmd_interpreter(sctp_event_t event_type
,
1053 sctp_subtype_t subtype
,
1055 struct sctp_endpoint
*ep
,
1056 struct sctp_association
*asoc
,
1058 sctp_disposition_t status
,
1059 sctp_cmd_seq_t
*commands
,
1065 struct sctp_chunk
*new_obj
;
1066 struct sctp_chunk
*chunk
= NULL
;
1067 struct sctp_packet
*packet
;
1068 struct list_head
*pos
;
1069 struct timer_list
*timer
;
1070 unsigned long timeout
;
1071 struct sctp_transport
*t
;
1072 struct sctp_sackhdr sackh
;
1075 if (SCTP_EVENT_T_TIMEOUT
!= event_type
)
1076 chunk
= (struct sctp_chunk
*) event_arg
;
1078 /* Note: This whole file is a huge candidate for rework.
1079 * For example, each command could either have its own handler, so
1080 * the loop would look like:
1082 * cmd->handle(x, y, z)
1085 while (NULL
!= (cmd
= sctp_next_cmd(commands
))) {
1086 switch (cmd
->verb
) {
1091 case SCTP_CMD_NEW_ASOC
:
1092 /* Register a new association. */
1094 sctp_outq_uncork(&asoc
->outqueue
);
1097 asoc
= cmd
->obj
.ptr
;
1098 /* Register with the endpoint. */
1099 sctp_endpoint_add_asoc(ep
, asoc
);
1100 sctp_hash_established(asoc
);
1103 case SCTP_CMD_UPDATE_ASSOC
:
1104 sctp_assoc_update(asoc
, cmd
->obj
.ptr
);
1107 case SCTP_CMD_PURGE_OUTQUEUE
:
1108 sctp_outq_teardown(&asoc
->outqueue
);
1111 case SCTP_CMD_DELETE_TCB
:
1113 sctp_outq_uncork(&asoc
->outqueue
);
1116 /* Delete the current association. */
1117 sctp_cmd_delete_tcb(commands
, asoc
);
1121 case SCTP_CMD_NEW_STATE
:
1122 /* Enter a new state. */
1123 sctp_cmd_new_state(commands
, asoc
, cmd
->obj
.state
);
1126 case SCTP_CMD_REPORT_TSN
:
1127 /* Record the arrival of a TSN. */
1128 sctp_tsnmap_mark(&asoc
->peer
.tsn_map
, cmd
->obj
.u32
);
1131 case SCTP_CMD_REPORT_FWDTSN
:
1132 /* Move the Cumulattive TSN Ack ahead. */
1133 sctp_tsnmap_skip(&asoc
->peer
.tsn_map
, cmd
->obj
.u32
);
1135 /* purge the fragmentation queue */
1136 sctp_ulpq_reasm_flushtsn(&asoc
->ulpq
, cmd
->obj
.u32
);
1138 /* Abort any in progress partial delivery. */
1139 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
1142 case SCTP_CMD_PROCESS_FWDTSN
:
1143 sctp_cmd_process_fwdtsn(&asoc
->ulpq
, cmd
->obj
.ptr
);
1146 case SCTP_CMD_GEN_SACK
:
1147 /* Generate a Selective ACK.
1148 * The argument tells us whether to just count
1149 * the packet and MAYBE generate a SACK, or
1152 force
= cmd
->obj
.i32
;
1153 error
= sctp_gen_sack(asoc
, force
, commands
);
1156 case SCTP_CMD_PROCESS_SACK
:
1157 /* Process an inbound SACK. */
1158 error
= sctp_cmd_process_sack(commands
, asoc
,
1162 case SCTP_CMD_GEN_INIT_ACK
:
1163 /* Generate an INIT ACK chunk. */
1164 new_obj
= sctp_make_init_ack(asoc
, chunk
, GFP_ATOMIC
,
1169 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1170 SCTP_CHUNK(new_obj
));
1173 case SCTP_CMD_PEER_INIT
:
1174 /* Process a unified INIT from the peer.
1175 * Note: Only used during INIT-ACK processing. If
1176 * there is an error just return to the outter
1177 * layer which will bail.
1179 error
= sctp_cmd_process_init(commands
, asoc
, chunk
,
1183 case SCTP_CMD_GEN_COOKIE_ECHO
:
1184 /* Generate a COOKIE ECHO chunk. */
1185 new_obj
= sctp_make_cookie_echo(asoc
, chunk
);
1188 sctp_chunk_free(cmd
->obj
.ptr
);
1191 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1192 SCTP_CHUNK(new_obj
));
1194 /* If there is an ERROR chunk to be sent along with
1195 * the COOKIE_ECHO, send it, too.
1198 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1199 SCTP_CHUNK(cmd
->obj
.ptr
));
1201 /* FIXME - Eventually come up with a cleaner way to
1202 * enabling COOKIE-ECHO + DATA bundling during
1203 * multihoming stale cookie scenarios, the following
1204 * command plays with asoc->peer.retran_path to
1205 * avoid the problem of sending the COOKIE-ECHO and
1206 * DATA in different paths, which could result
1207 * in the association being ABORTed if the DATA chunk
1208 * is processed first by the server. Checking the
1209 * init error counter simply causes this command
1210 * to be executed only during failed attempts of
1211 * association establishment.
1213 if ((asoc
->peer
.retran_path
!=
1214 asoc
->peer
.primary_path
) &&
1215 (asoc
->init_err_counter
> 0)) {
1216 sctp_add_cmd_sf(commands
,
1217 SCTP_CMD_FORCE_PRIM_RETRAN
,
1223 case SCTP_CMD_GEN_SHUTDOWN
:
1224 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1225 * Reset error counts.
1227 asoc
->overall_error_count
= 0;
1229 /* Generate a SHUTDOWN chunk. */
1230 new_obj
= sctp_make_shutdown(asoc
, chunk
);
1233 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1234 SCTP_CHUNK(new_obj
));
1237 case SCTP_CMD_CHUNK_ULP
:
1238 /* Send a chunk to the sockets layer. */
1239 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1240 "chunk_up:", cmd
->obj
.ptr
,
1241 "ulpq:", &asoc
->ulpq
);
1242 sctp_ulpq_tail_data(&asoc
->ulpq
, cmd
->obj
.ptr
,
1246 case SCTP_CMD_EVENT_ULP
:
1247 /* Send a notification to the sockets layer. */
1248 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1249 "event_up:",cmd
->obj
.ptr
,
1250 "ulpq:",&asoc
->ulpq
);
1251 sctp_ulpq_tail_event(&asoc
->ulpq
, cmd
->obj
.ptr
);
1254 case SCTP_CMD_REPLY
:
1255 /* If an caller has not already corked, do cork. */
1256 if (!asoc
->outqueue
.cork
) {
1257 sctp_outq_cork(&asoc
->outqueue
);
1260 /* Send a chunk to our peer. */
1261 error
= sctp_outq_tail(&asoc
->outqueue
, cmd
->obj
.ptr
);
1264 case SCTP_CMD_SEND_PKT
:
1265 /* Send a full packet to our peer. */
1266 packet
= cmd
->obj
.ptr
;
1267 sctp_packet_transmit(packet
);
1268 sctp_ootb_pkt_free(packet
);
1271 case SCTP_CMD_T1_RETRAN
:
1272 /* Mark a transport for retransmission. */
1273 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1277 case SCTP_CMD_RETRAN
:
1278 /* Mark a transport for retransmission. */
1279 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1283 case SCTP_CMD_TRANSMIT
:
1284 /* Kick start transmission. */
1285 error
= sctp_outq_uncork(&asoc
->outqueue
);
1289 case SCTP_CMD_ECN_CE
:
1290 /* Do delayed CE processing. */
1291 sctp_do_ecn_ce_work(asoc
, cmd
->obj
.u32
);
1294 case SCTP_CMD_ECN_ECNE
:
1295 /* Do delayed ECNE processing. */
1296 new_obj
= sctp_do_ecn_ecne_work(asoc
, cmd
->obj
.u32
,
1299 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1300 SCTP_CHUNK(new_obj
));
1303 case SCTP_CMD_ECN_CWR
:
1304 /* Do delayed CWR processing. */
1305 sctp_do_ecn_cwr_work(asoc
, cmd
->obj
.u32
);
1308 case SCTP_CMD_SETUP_T2
:
1309 sctp_cmd_setup_t2(commands
, asoc
, cmd
->obj
.ptr
);
1312 case SCTP_CMD_TIMER_START
:
1313 timer
= &asoc
->timers
[cmd
->obj
.to
];
1314 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1317 timer
->expires
= jiffies
+ timeout
;
1318 sctp_association_hold(asoc
);
1322 case SCTP_CMD_TIMER_RESTART
:
1323 timer
= &asoc
->timers
[cmd
->obj
.to
];
1324 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1325 if (!mod_timer(timer
, jiffies
+ timeout
))
1326 sctp_association_hold(asoc
);
1329 case SCTP_CMD_TIMER_STOP
:
1330 timer
= &asoc
->timers
[cmd
->obj
.to
];
1331 if (timer_pending(timer
) && del_timer(timer
))
1332 sctp_association_put(asoc
);
1335 case SCTP_CMD_INIT_CHOOSE_TRANSPORT
:
1336 chunk
= cmd
->obj
.ptr
;
1337 t
= sctp_assoc_choose_init_transport(asoc
);
1338 asoc
->init_last_sent_to
= t
;
1339 chunk
->transport
= t
;
1340 t
->init_sent_count
++;
1343 case SCTP_CMD_INIT_RESTART
:
1344 /* Do the needed accounting and updates
1345 * associated with restarting an initialization
1346 * timer. Only multiply the timeout by two if
1347 * all transports have been tried at the current
1350 t
= asoc
->init_last_sent_to
;
1351 asoc
->init_err_counter
++;
1353 if (t
->init_sent_count
> (asoc
->init_cycle
+ 1)) {
1354 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] *= 2;
1355 if (asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] >
1356 asoc
->max_init_timeo
) {
1357 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] =
1358 asoc
->max_init_timeo
;
1362 "T1 INIT Timeout adjustment"
1363 " init_err_counter: %d"
1366 asoc
->init_err_counter
,
1368 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
]);
1371 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
1372 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT
));
1375 case SCTP_CMD_COOKIEECHO_RESTART
:
1376 /* Do the needed accounting and updates
1377 * associated with restarting an initialization
1378 * timer. Only multiply the timeout by two if
1379 * all transports have been tried at the current
1382 asoc
->init_err_counter
++;
1384 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] *= 2;
1385 if (asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] >
1386 asoc
->max_init_timeo
) {
1387 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] =
1388 asoc
->max_init_timeo
;
1391 "T1 COOKIE Timeout adjustment"
1392 " init_err_counter: %d"
1394 asoc
->init_err_counter
,
1395 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
]);
1397 /* If we've sent any data bundled with
1398 * COOKIE-ECHO we need to resend.
1400 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
1401 t
= list_entry(pos
, struct sctp_transport
,
1403 sctp_retransmit_mark(&asoc
->outqueue
, t
,
1407 sctp_add_cmd_sf(commands
,
1408 SCTP_CMD_TIMER_RESTART
,
1409 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE
));
1412 case SCTP_CMD_INIT_FAILED
:
1413 sctp_cmd_init_failed(commands
, asoc
, cmd
->obj
.err
);
1416 case SCTP_CMD_ASSOC_FAILED
:
1417 sctp_cmd_assoc_failed(commands
, asoc
, event_type
,
1418 subtype
, chunk
, cmd
->obj
.err
);
1421 case SCTP_CMD_INIT_COUNTER_INC
:
1422 asoc
->init_err_counter
++;
1425 case SCTP_CMD_INIT_COUNTER_RESET
:
1426 asoc
->init_err_counter
= 0;
1427 asoc
->init_cycle
= 0;
1430 case SCTP_CMD_REPORT_DUP
:
1431 sctp_tsnmap_mark_dup(&asoc
->peer
.tsn_map
,
1435 case SCTP_CMD_REPORT_BAD_TAG
:
1436 SCTP_DEBUG_PRINTK("vtag mismatch!\n");
1439 case SCTP_CMD_STRIKE
:
1440 /* Mark one strike against a transport. */
1441 sctp_do_8_2_transport_strike(asoc
, cmd
->obj
.transport
);
1444 case SCTP_CMD_TRANSPORT_RESET
:
1445 t
= cmd
->obj
.transport
;
1446 sctp_cmd_transport_reset(commands
, asoc
, t
);
1449 case SCTP_CMD_TRANSPORT_ON
:
1450 t
= cmd
->obj
.transport
;
1451 sctp_cmd_transport_on(commands
, asoc
, t
, chunk
);
1454 case SCTP_CMD_HB_TIMERS_START
:
1455 sctp_cmd_hb_timers_start(commands
, asoc
);
1458 case SCTP_CMD_HB_TIMER_UPDATE
:
1459 t
= cmd
->obj
.transport
;
1460 sctp_cmd_hb_timer_update(commands
, asoc
, t
);
1463 case SCTP_CMD_HB_TIMERS_STOP
:
1464 sctp_cmd_hb_timers_stop(commands
, asoc
);
1467 case SCTP_CMD_REPORT_ERROR
:
1468 error
= cmd
->obj
.error
;
1471 case SCTP_CMD_PROCESS_CTSN
:
1472 /* Dummy up a SACK for processing. */
1473 sackh
.cum_tsn_ack
= cmd
->obj
.be32
;
1475 sackh
.num_gap_ack_blocks
= 0;
1476 sackh
.num_dup_tsns
= 0;
1477 sctp_add_cmd_sf(commands
, SCTP_CMD_PROCESS_SACK
,
1478 SCTP_SACKH(&sackh
));
1481 case SCTP_CMD_DISCARD_PACKET
:
1482 /* We need to discard the whole packet. */
1483 chunk
->pdiscard
= 1;
1486 case SCTP_CMD_RTO_PENDING
:
1487 t
= cmd
->obj
.transport
;
1491 case SCTP_CMD_PART_DELIVER
:
1492 sctp_ulpq_partial_delivery(&asoc
->ulpq
, cmd
->obj
.ptr
,
1496 case SCTP_CMD_RENEGE
:
1497 sctp_ulpq_renege(&asoc
->ulpq
, cmd
->obj
.ptr
,
1501 case SCTP_CMD_SETUP_T4
:
1502 sctp_cmd_setup_t4(commands
, asoc
, cmd
->obj
.ptr
);
1505 case SCTP_CMD_PROCESS_OPERR
:
1506 sctp_cmd_process_operr(commands
, asoc
, chunk
);
1508 case SCTP_CMD_CLEAR_INIT_TAG
:
1509 asoc
->peer
.i
.init_tag
= 0;
1511 case SCTP_CMD_DEL_NON_PRIMARY
:
1512 sctp_cmd_del_non_primary(asoc
);
1514 case SCTP_CMD_T3_RTX_TIMERS_STOP
:
1515 sctp_cmd_t3_rtx_timers_stop(commands
, asoc
);
1517 case SCTP_CMD_FORCE_PRIM_RETRAN
:
1518 t
= asoc
->peer
.retran_path
;
1519 asoc
->peer
.retran_path
= asoc
->peer
.primary_path
;
1520 error
= sctp_outq_uncork(&asoc
->outqueue
);
1522 asoc
->peer
.retran_path
= t
;
1524 case SCTP_CMD_SET_SK_ERR
:
1525 sctp_cmd_set_sk_err(asoc
, cmd
->obj
.error
);
1527 case SCTP_CMD_ASSOC_CHANGE
:
1528 sctp_cmd_assoc_change(commands
, asoc
,
1531 case SCTP_CMD_ADAPTATION_IND
:
1532 sctp_cmd_adaptation_ind(commands
, asoc
);
1535 case SCTP_CMD_ASSOC_SHKEY
:
1536 error
= sctp_auth_asoc_init_active_key(asoc
,
1539 case SCTP_CMD_UPDATE_INITTAG
:
1540 asoc
->peer
.i
.init_tag
= cmd
->obj
.u32
;
1544 printk(KERN_WARNING
"Impossible command: %u, %p\n",
1545 cmd
->verb
, cmd
->obj
.ptr
);
1555 sctp_outq_uncork(&asoc
->outqueue
);