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 asoc
->peer
.sack_cnt
++;
195 /* Set the SACK delay timeout based on the
196 * SACK delay for the last transport
197 * data was received from, or the default
198 * for the association.
201 /* We will need a SACK for the next packet. */
202 if (asoc
->peer
.sack_cnt
>= trans
->sackfreq
- 1)
203 asoc
->peer
.sack_needed
= 1;
205 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
208 /* We will need a SACK for the next packet. */
209 if (asoc
->peer
.sack_cnt
>= asoc
->sackfreq
- 1)
210 asoc
->peer
.sack_needed
= 1;
212 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
216 /* Restart the SACK timer. */
217 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
218 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
220 if (asoc
->a_rwnd
> asoc
->rwnd
)
221 asoc
->a_rwnd
= asoc
->rwnd
;
222 sack
= sctp_make_sack(asoc
);
226 asoc
->peer
.sack_needed
= 0;
227 asoc
->peer
.sack_cnt
= 0;
229 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
, SCTP_CHUNK(sack
));
231 /* Stop the SACK timer. */
232 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_STOP
,
233 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
242 /* When the T3-RTX timer expires, it calls this function to create the
243 * relevant state machine event.
245 void sctp_generate_t3_rtx_event(unsigned long peer
)
248 struct sctp_transport
*transport
= (struct sctp_transport
*) peer
;
249 struct sctp_association
*asoc
= transport
->asoc
;
251 /* Check whether a task is in the sock. */
253 sctp_bh_lock_sock(asoc
->base
.sk
);
254 if (sock_owned_by_user(asoc
->base
.sk
)) {
255 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__
);
257 /* Try again later. */
258 if (!mod_timer(&transport
->T3_rtx_timer
, jiffies
+ (HZ
/20)))
259 sctp_transport_hold(transport
);
263 /* Is this transport really dead and just waiting around for
264 * the timer to let go of the reference?
269 /* Run through the state machine. */
270 error
= sctp_do_sm(SCTP_EVENT_T_TIMEOUT
,
271 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX
),
274 transport
, GFP_ATOMIC
);
277 asoc
->base
.sk
->sk_err
= -error
;
280 sctp_bh_unlock_sock(asoc
->base
.sk
);
281 sctp_transport_put(transport
);
284 /* This is a sa interface for producing timeout events. It works
285 * for timeouts which use the association as their parameter.
287 static void sctp_generate_timeout_event(struct sctp_association
*asoc
,
288 sctp_event_timeout_t timeout_type
)
292 sctp_bh_lock_sock(asoc
->base
.sk
);
293 if (sock_owned_by_user(asoc
->base
.sk
)) {
294 SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n",
298 /* Try again later. */
299 if (!mod_timer(&asoc
->timers
[timeout_type
], jiffies
+ (HZ
/20)))
300 sctp_association_hold(asoc
);
304 /* Is this association really dead and just waiting around for
305 * the timer to let go of the reference?
310 /* Run through the state machine. */
311 error
= sctp_do_sm(SCTP_EVENT_T_TIMEOUT
,
312 SCTP_ST_TIMEOUT(timeout_type
),
313 asoc
->state
, asoc
->ep
, asoc
,
314 (void *)timeout_type
, GFP_ATOMIC
);
317 asoc
->base
.sk
->sk_err
= -error
;
320 sctp_bh_unlock_sock(asoc
->base
.sk
);
321 sctp_association_put(asoc
);
324 static void sctp_generate_t1_cookie_event(unsigned long data
)
326 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
327 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_COOKIE
);
330 static void sctp_generate_t1_init_event(unsigned long data
)
332 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
333 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_INIT
);
336 static void sctp_generate_t2_shutdown_event(unsigned long data
)
338 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
339 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
);
342 static void sctp_generate_t4_rto_event(unsigned long data
)
344 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
345 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T4_RTO
);
348 static void sctp_generate_t5_shutdown_guard_event(unsigned long data
)
350 struct sctp_association
*asoc
= (struct sctp_association
*)data
;
351 sctp_generate_timeout_event(asoc
,
352 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD
);
354 } /* sctp_generate_t5_shutdown_guard_event() */
356 static void sctp_generate_autoclose_event(unsigned long data
)
358 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
359 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_AUTOCLOSE
);
362 /* Generate a heart beat event. If the sock is busy, reschedule. Make
363 * sure that the transport is still valid.
365 void sctp_generate_heartbeat_event(unsigned long data
)
368 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
369 struct sctp_association
*asoc
= transport
->asoc
;
371 sctp_bh_lock_sock(asoc
->base
.sk
);
372 if (sock_owned_by_user(asoc
->base
.sk
)) {
373 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__
);
375 /* Try again later. */
376 if (!mod_timer(&transport
->hb_timer
, jiffies
+ (HZ
/20)))
377 sctp_transport_hold(transport
);
381 /* Is this structure just waiting around for us to actually
387 error
= sctp_do_sm(SCTP_EVENT_T_TIMEOUT
,
388 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT
),
389 asoc
->state
, asoc
->ep
, asoc
,
390 transport
, GFP_ATOMIC
);
393 asoc
->base
.sk
->sk_err
= -error
;
396 sctp_bh_unlock_sock(asoc
->base
.sk
);
397 sctp_transport_put(transport
);
400 /* Inject a SACK Timeout event into the state machine. */
401 static void sctp_generate_sack_event(unsigned long data
)
403 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
404 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_SACK
);
407 sctp_timer_event_t
*sctp_timer_events
[SCTP_NUM_TIMEOUT_TYPES
] = {
409 sctp_generate_t1_cookie_event
,
410 sctp_generate_t1_init_event
,
411 sctp_generate_t2_shutdown_event
,
413 sctp_generate_t4_rto_event
,
414 sctp_generate_t5_shutdown_guard_event
,
416 sctp_generate_sack_event
,
417 sctp_generate_autoclose_event
,
421 /* RFC 2960 8.2 Path Failure Detection
423 * When its peer endpoint is multi-homed, an endpoint should keep a
424 * error counter for each of the destination transport addresses of the
427 * Each time the T3-rtx timer expires on any address, or when a
428 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
429 * the error counter of that destination address will be incremented.
430 * When the value in the error counter exceeds the protocol parameter
431 * 'Path.Max.Retrans' of that destination address, the endpoint should
432 * mark the destination transport address as inactive, and a
433 * notification SHOULD be sent to the upper layer.
436 static void sctp_do_8_2_transport_strike(struct sctp_association
*asoc
,
437 struct sctp_transport
*transport
)
439 /* The check for association's overall error counter exceeding the
440 * threshold is done in the state function.
442 /* When probing UNCONFIRMED addresses, the association overall
443 * error count is NOT incremented
445 if (transport
->state
!= SCTP_UNCONFIRMED
)
446 asoc
->overall_error_count
++;
448 if (transport
->state
!= SCTP_INACTIVE
&&
449 (transport
->error_count
++ >= transport
->pathmaxrxt
)) {
450 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
451 " transport IP: port:%d failed.\n",
453 (&transport
->ipaddr
),
454 ntohs(transport
->ipaddr
.v4
.sin_port
));
455 sctp_assoc_control_transport(asoc
, transport
,
457 SCTP_FAILED_THRESHOLD
);
460 /* E2) For the destination address for which the timer
461 * expires, set RTO <- RTO * 2 ("back off the timer"). The
462 * maximum value discussed in rule C7 above (RTO.max) may be
463 * used to provide an upper bound to this doubling operation.
465 transport
->last_rto
= transport
->rto
;
466 transport
->rto
= min((transport
->rto
* 2), transport
->asoc
->rto_max
);
469 /* Worker routine to handle INIT command failure. */
470 static void sctp_cmd_init_failed(sctp_cmd_seq_t
*commands
,
471 struct sctp_association
*asoc
,
474 struct sctp_ulpevent
*event
;
476 event
= sctp_ulpevent_make_assoc_change(asoc
,0, SCTP_CANT_STR_ASSOC
,
477 (__u16
)error
, 0, 0, NULL
,
481 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
482 SCTP_ULPEVENT(event
));
484 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
485 SCTP_STATE(SCTP_STATE_CLOSED
));
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 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
493 static void sctp_cmd_assoc_failed(sctp_cmd_seq_t
*commands
,
494 struct sctp_association
*asoc
,
495 sctp_event_t event_type
,
496 sctp_subtype_t subtype
,
497 struct sctp_chunk
*chunk
,
500 struct sctp_ulpevent
*event
;
502 /* Cancel any partial delivery in progress. */
503 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
505 if (event_type
== SCTP_EVENT_T_CHUNK
&& subtype
.chunk
== SCTP_CID_ABORT
)
506 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
507 (__u16
)error
, 0, 0, chunk
,
510 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
511 (__u16
)error
, 0, 0, NULL
,
514 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
515 SCTP_ULPEVENT(event
));
517 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
518 SCTP_STATE(SCTP_STATE_CLOSED
));
520 /* SEND_FAILED sent later when cleaning up the association. */
521 asoc
->outqueue
.error
= error
;
522 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
525 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
526 * inside the cookie. In reality, this is only used for INIT-ACK processing
527 * since all other cases use "temporary" associations and can do all
528 * their work in statefuns directly.
530 static int sctp_cmd_process_init(sctp_cmd_seq_t
*commands
,
531 struct sctp_association
*asoc
,
532 struct sctp_chunk
*chunk
,
533 sctp_init_chunk_t
*peer_init
,
538 /* We only process the init as a sideeffect in a single
539 * case. This is when we process the INIT-ACK. If we
540 * fail during INIT processing (due to malloc problems),
541 * just return the error and stop processing the stack.
543 if (!sctp_process_init(asoc
, chunk
->chunk_hdr
->type
,
544 sctp_source(chunk
), peer_init
, gfp
))
552 /* Helper function to break out starting up of heartbeat timers. */
553 static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t
*cmds
,
554 struct sctp_association
*asoc
)
556 struct sctp_transport
*t
;
558 /* Start a heartbeat timer for each transport on the association.
559 * hold a reference on the transport to make sure none of
560 * the needed data structures go away.
562 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
, transports
) {
564 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
565 sctp_transport_hold(t
);
569 static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t
*cmds
,
570 struct sctp_association
*asoc
)
572 struct sctp_transport
*t
;
574 /* Stop all heartbeat timers. */
576 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
578 if (del_timer(&t
->hb_timer
))
579 sctp_transport_put(t
);
583 /* Helper function to stop any pending T3-RTX timers */
584 static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t
*cmds
,
585 struct sctp_association
*asoc
)
587 struct sctp_transport
*t
;
589 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
591 if (timer_pending(&t
->T3_rtx_timer
) &&
592 del_timer(&t
->T3_rtx_timer
)) {
593 sctp_transport_put(t
);
599 /* Helper function to update the heartbeat timer. */
600 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t
*cmds
,
601 struct sctp_transport
*t
)
603 /* Update the heartbeat timer. */
604 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
605 sctp_transport_hold(t
);
608 /* Helper function to handle the reception of an HEARTBEAT ACK. */
609 static void sctp_cmd_transport_on(sctp_cmd_seq_t
*cmds
,
610 struct sctp_association
*asoc
,
611 struct sctp_transport
*t
,
612 struct sctp_chunk
*chunk
)
614 sctp_sender_hb_info_t
*hbinfo
;
616 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
617 * HEARTBEAT should clear the error counter of the destination
618 * transport address to which the HEARTBEAT was sent.
619 * The association's overall error count is also cleared.
622 t
->asoc
->overall_error_count
= 0;
624 /* Mark the destination transport address as active if it is not so
627 if ((t
->state
== SCTP_INACTIVE
) || (t
->state
== SCTP_UNCONFIRMED
))
628 sctp_assoc_control_transport(asoc
, t
, SCTP_TRANSPORT_UP
,
629 SCTP_HEARTBEAT_SUCCESS
);
631 /* The receiver of the HEARTBEAT ACK should also perform an
632 * RTT measurement for that destination transport address
633 * using the time value carried in the HEARTBEAT ACK chunk.
634 * If the transport's rto_pending variable has been cleared,
635 * it was most likely due to a retransmit. However, we want
636 * to re-enable it to properly update the rto.
638 if (t
->rto_pending
== 0)
641 hbinfo
= (sctp_sender_hb_info_t
*) chunk
->skb
->data
;
642 sctp_transport_update_rto(t
, (jiffies
- hbinfo
->sent_at
));
644 /* Update the heartbeat timer. */
645 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
646 sctp_transport_hold(t
);
649 /* Helper function to do a transport reset at the expiry of the hearbeat
652 static void sctp_cmd_transport_reset(sctp_cmd_seq_t
*cmds
,
653 struct sctp_association
*asoc
,
654 struct sctp_transport
*t
)
656 sctp_transport_lower_cwnd(t
, SCTP_LOWER_CWND_INACTIVE
);
658 /* Mark one strike against a transport. */
659 sctp_do_8_2_transport_strike(asoc
, t
);
662 /* Helper function to process the process SACK command. */
663 static int sctp_cmd_process_sack(sctp_cmd_seq_t
*cmds
,
664 struct sctp_association
*asoc
,
665 struct sctp_sackhdr
*sackh
)
669 if (sctp_outq_sack(&asoc
->outqueue
, sackh
)) {
670 /* There are no more TSNs awaiting SACK. */
671 err
= sctp_do_sm(SCTP_EVENT_T_OTHER
,
672 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN
),
673 asoc
->state
, asoc
->ep
, asoc
, NULL
,
676 /* Windows may have opened, so we need
677 * to check if we have DATA to transmit
679 err
= sctp_outq_flush(&asoc
->outqueue
, 0);
685 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
686 * the transport for a shutdown chunk.
688 static void sctp_cmd_setup_t2(sctp_cmd_seq_t
*cmds
,
689 struct sctp_association
*asoc
,
690 struct sctp_chunk
*chunk
)
692 struct sctp_transport
*t
;
694 t
= sctp_assoc_choose_shutdown_transport(asoc
);
695 asoc
->shutdown_last_sent_to
= t
;
696 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
] = t
->rto
;
697 chunk
->transport
= t
;
700 /* Helper function to change the state of an association. */
701 static void sctp_cmd_new_state(sctp_cmd_seq_t
*cmds
,
702 struct sctp_association
*asoc
,
705 struct sock
*sk
= asoc
->base
.sk
;
709 SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n",
710 asoc
, sctp_state_tbl
[state
]);
712 if (sctp_style(sk
, TCP
)) {
713 /* Change the sk->sk_state of a TCP-style socket that has
714 * sucessfully completed a connect() call.
716 if (sctp_state(asoc
, ESTABLISHED
) && sctp_sstate(sk
, CLOSED
))
717 sk
->sk_state
= SCTP_SS_ESTABLISHED
;
719 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
720 if (sctp_state(asoc
, SHUTDOWN_RECEIVED
) &&
721 sctp_sstate(sk
, ESTABLISHED
))
722 sk
->sk_shutdown
|= RCV_SHUTDOWN
;
725 if (sctp_state(asoc
, COOKIE_WAIT
)) {
726 /* Reset init timeouts since they may have been
727 * increased due to timer expirations.
729 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] =
731 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] =
735 if (sctp_state(asoc
, ESTABLISHED
) ||
736 sctp_state(asoc
, CLOSED
) ||
737 sctp_state(asoc
, SHUTDOWN_RECEIVED
)) {
738 /* Wake up any processes waiting in the asoc's wait queue in
739 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
741 if (waitqueue_active(&asoc
->wait
))
742 wake_up_interruptible(&asoc
->wait
);
744 /* Wake up any processes waiting in the sk's sleep queue of
745 * a TCP-style or UDP-style peeled-off socket in
746 * sctp_wait_for_accept() or sctp_wait_for_packet().
747 * For a UDP-style socket, the waiters are woken up by the
750 if (!sctp_style(sk
, UDP
))
751 sk
->sk_state_change(sk
);
755 /* Helper function to delete an association. */
756 static void sctp_cmd_delete_tcb(sctp_cmd_seq_t
*cmds
,
757 struct sctp_association
*asoc
)
759 struct sock
*sk
= asoc
->base
.sk
;
761 /* If it is a non-temporary association belonging to a TCP-style
762 * listening socket that is not closed, do not free it so that accept()
763 * can pick it up later.
765 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
) &&
766 (!asoc
->temp
) && (sk
->sk_shutdown
!= SHUTDOWN_MASK
))
769 sctp_unhash_established(asoc
);
770 sctp_association_free(asoc
);
774 * ADDIP Section 4.1 ASCONF Chunk Procedures
775 * A4) Start a T-4 RTO timer, using the RTO value of the selected
776 * destination address (we use active path instead of primary path just
777 * because primary path may be inactive.
779 static void sctp_cmd_setup_t4(sctp_cmd_seq_t
*cmds
,
780 struct sctp_association
*asoc
,
781 struct sctp_chunk
*chunk
)
783 struct sctp_transport
*t
;
785 t
= asoc
->peer
.active_path
;
786 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T4_RTO
] = t
->rto
;
787 chunk
->transport
= t
;
790 /* Process an incoming Operation Error Chunk. */
791 static void sctp_cmd_process_operr(sctp_cmd_seq_t
*cmds
,
792 struct sctp_association
*asoc
,
793 struct sctp_chunk
*chunk
)
795 struct sctp_operr_chunk
*operr_chunk
;
796 struct sctp_errhdr
*err_hdr
;
798 operr_chunk
= (struct sctp_operr_chunk
*)chunk
->chunk_hdr
;
799 err_hdr
= &operr_chunk
->err_hdr
;
801 switch (err_hdr
->cause
) {
802 case SCTP_ERROR_UNKNOWN_CHUNK
:
804 struct sctp_chunkhdr
*unk_chunk_hdr
;
806 unk_chunk_hdr
= (struct sctp_chunkhdr
*)err_hdr
->variable
;
807 switch (unk_chunk_hdr
->type
) {
808 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with an
809 * ERROR chunk reporting that it did not recognized the ASCONF
810 * chunk type, the sender of the ASCONF MUST NOT send any
811 * further ASCONF chunks and MUST stop its T-4 timer.
813 case SCTP_CID_ASCONF
:
814 asoc
->peer
.asconf_capable
= 0;
815 sctp_add_cmd_sf(cmds
, SCTP_CMD_TIMER_STOP
,
816 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO
));
828 /* Process variable FWDTSN chunk information. */
829 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq
*ulpq
,
830 struct sctp_chunk
*chunk
)
832 struct sctp_fwdtsn_skip
*skip
;
833 /* Walk through all the skipped SSNs */
834 sctp_walk_fwdtsn(skip
, chunk
) {
835 sctp_ulpq_skip(ulpq
, ntohs(skip
->stream
), ntohs(skip
->ssn
));
841 /* Helper function to remove the association non-primary peer
844 static void sctp_cmd_del_non_primary(struct sctp_association
*asoc
)
846 struct sctp_transport
*t
;
847 struct list_head
*pos
;
848 struct list_head
*temp
;
850 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
851 t
= list_entry(pos
, struct sctp_transport
, transports
);
852 if (!sctp_cmp_addr_exact(&t
->ipaddr
,
853 &asoc
->peer
.primary_addr
)) {
854 sctp_assoc_del_peer(asoc
, &t
->ipaddr
);
861 /* Helper function to set sk_err on a 1-1 style socket. */
862 static void sctp_cmd_set_sk_err(struct sctp_association
*asoc
, int error
)
864 struct sock
*sk
= asoc
->base
.sk
;
866 if (!sctp_style(sk
, UDP
))
870 /* Helper function to generate an association change event */
871 static void sctp_cmd_assoc_change(sctp_cmd_seq_t
*commands
,
872 struct sctp_association
*asoc
,
875 struct sctp_ulpevent
*ev
;
877 ev
= sctp_ulpevent_make_assoc_change(asoc
, 0, state
, 0,
878 asoc
->c
.sinit_num_ostreams
,
879 asoc
->c
.sinit_max_instreams
,
882 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
885 /* Helper function to generate an adaptation indication event */
886 static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t
*commands
,
887 struct sctp_association
*asoc
)
889 struct sctp_ulpevent
*ev
;
891 ev
= sctp_ulpevent_make_adaptation_indication(asoc
, GFP_ATOMIC
);
894 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
897 /* These three macros allow us to pull the debugging code out of the
898 * main flow of sctp_do_sm() to keep attention focused on the real
899 * functionality there.
902 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
903 "ep %p, %s, %s, asoc %p[%s], %s\n", \
904 ep, sctp_evttype_tbl[event_type], \
905 (*debug_fn)(subtype), asoc, \
906 sctp_state_tbl[state], state_fn->name)
909 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
910 "asoc %p, status: %s\n", \
911 asoc, sctp_status_tbl[status])
913 #define DEBUG_POST_SFX \
914 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
916 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
917 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
920 * This is the master state machine processing function.
922 * If you want to understand all of lksctp, this is a
923 * good place to start.
925 int sctp_do_sm(sctp_event_t event_type
, sctp_subtype_t subtype
,
927 struct sctp_endpoint
*ep
,
928 struct sctp_association
*asoc
,
932 sctp_cmd_seq_t commands
;
933 const sctp_sm_table_entry_t
*state_fn
;
934 sctp_disposition_t status
;
936 typedef const char *(printfn_t
)(sctp_subtype_t
);
938 static printfn_t
*table
[] = {
939 NULL
, sctp_cname
, sctp_tname
, sctp_oname
, sctp_pname
,
941 printfn_t
*debug_fn
__attribute__ ((unused
)) = table
[event_type
];
943 /* Look up the state function, run it, and then process the
944 * side effects. These three steps are the heart of lksctp.
946 state_fn
= sctp_sm_lookup_event(event_type
, state
, subtype
);
948 sctp_init_cmd_seq(&commands
);
951 status
= (*state_fn
->fn
)(ep
, asoc
, subtype
, event_arg
, &commands
);
954 error
= sctp_side_effects(event_type
, subtype
, state
,
955 ep
, asoc
, event_arg
, status
,
965 /*****************************************************************
966 * This the master state function side effect processing function.
967 *****************************************************************/
968 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
970 struct sctp_endpoint
*ep
,
971 struct sctp_association
*asoc
,
973 sctp_disposition_t status
,
974 sctp_cmd_seq_t
*commands
,
979 /* FIXME - Most of the dispositions left today would be categorized
980 * as "exceptional" dispositions. For those dispositions, it
981 * may not be proper to run through any of the commands at all.
982 * For example, the command interpreter might be run only with
983 * disposition SCTP_DISPOSITION_CONSUME.
985 if (0 != (error
= sctp_cmd_interpreter(event_type
, subtype
, state
,
992 case SCTP_DISPOSITION_DISCARD
:
993 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
994 "event_type %d, event_id %d\n",
995 state
, event_type
, subtype
.chunk
);
998 case SCTP_DISPOSITION_NOMEM
:
999 /* We ran out of memory, so we need to discard this
1002 /* BUG--we should now recover some memory, probably by
1008 case SCTP_DISPOSITION_DELETE_TCB
:
1009 /* This should now be a command. */
1012 case SCTP_DISPOSITION_CONSUME
:
1013 case SCTP_DISPOSITION_ABORT
:
1015 * We should no longer have much work to do here as the
1016 * real work has been done as explicit commands above.
1020 case SCTP_DISPOSITION_VIOLATION
:
1021 if (net_ratelimit())
1022 printk(KERN_ERR
"sctp protocol violation state %d "
1023 "chunkid %d\n", state
, subtype
.chunk
);
1026 case SCTP_DISPOSITION_NOT_IMPL
:
1027 printk(KERN_WARNING
"sctp unimplemented feature in state %d, "
1028 "event_type %d, event_id %d\n",
1029 state
, event_type
, subtype
.chunk
);
1032 case SCTP_DISPOSITION_BUG
:
1033 printk(KERN_ERR
"sctp bug in state %d, "
1034 "event_type %d, event_id %d\n",
1035 state
, event_type
, subtype
.chunk
);
1040 printk(KERN_ERR
"sctp impossible disposition %d "
1041 "in state %d, event_type %d, event_id %d\n",
1042 status
, state
, event_type
, subtype
.chunk
);
1051 /********************************************************************
1052 * 2nd Level Abstractions
1053 ********************************************************************/
1055 /* This is the side-effect interpreter. */
1056 static int sctp_cmd_interpreter(sctp_event_t event_type
,
1057 sctp_subtype_t subtype
,
1059 struct sctp_endpoint
*ep
,
1060 struct sctp_association
*asoc
,
1062 sctp_disposition_t status
,
1063 sctp_cmd_seq_t
*commands
,
1069 struct sctp_chunk
*new_obj
;
1070 struct sctp_chunk
*chunk
= NULL
;
1071 struct sctp_packet
*packet
;
1072 struct timer_list
*timer
;
1073 unsigned long timeout
;
1074 struct sctp_transport
*t
;
1075 struct sctp_sackhdr sackh
;
1078 if (SCTP_EVENT_T_TIMEOUT
!= event_type
)
1079 chunk
= (struct sctp_chunk
*) event_arg
;
1081 /* Note: This whole file is a huge candidate for rework.
1082 * For example, each command could either have its own handler, so
1083 * the loop would look like:
1085 * cmd->handle(x, y, z)
1088 while (NULL
!= (cmd
= sctp_next_cmd(commands
))) {
1089 switch (cmd
->verb
) {
1094 case SCTP_CMD_NEW_ASOC
:
1095 /* Register a new association. */
1097 sctp_outq_uncork(&asoc
->outqueue
);
1100 asoc
= cmd
->obj
.ptr
;
1101 /* Register with the endpoint. */
1102 sctp_endpoint_add_asoc(ep
, asoc
);
1103 sctp_hash_established(asoc
);
1106 case SCTP_CMD_UPDATE_ASSOC
:
1107 sctp_assoc_update(asoc
, cmd
->obj
.ptr
);
1110 case SCTP_CMD_PURGE_OUTQUEUE
:
1111 sctp_outq_teardown(&asoc
->outqueue
);
1114 case SCTP_CMD_DELETE_TCB
:
1116 sctp_outq_uncork(&asoc
->outqueue
);
1119 /* Delete the current association. */
1120 sctp_cmd_delete_tcb(commands
, asoc
);
1124 case SCTP_CMD_NEW_STATE
:
1125 /* Enter a new state. */
1126 sctp_cmd_new_state(commands
, asoc
, cmd
->obj
.state
);
1129 case SCTP_CMD_REPORT_TSN
:
1130 /* Record the arrival of a TSN. */
1131 sctp_tsnmap_mark(&asoc
->peer
.tsn_map
, cmd
->obj
.u32
);
1134 case SCTP_CMD_REPORT_FWDTSN
:
1135 /* Move the Cumulattive TSN Ack ahead. */
1136 sctp_tsnmap_skip(&asoc
->peer
.tsn_map
, cmd
->obj
.u32
);
1138 /* purge the fragmentation queue */
1139 sctp_ulpq_reasm_flushtsn(&asoc
->ulpq
, cmd
->obj
.u32
);
1141 /* Abort any in progress partial delivery. */
1142 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
1145 case SCTP_CMD_PROCESS_FWDTSN
:
1146 sctp_cmd_process_fwdtsn(&asoc
->ulpq
, cmd
->obj
.ptr
);
1149 case SCTP_CMD_GEN_SACK
:
1150 /* Generate a Selective ACK.
1151 * The argument tells us whether to just count
1152 * the packet and MAYBE generate a SACK, or
1155 force
= cmd
->obj
.i32
;
1156 error
= sctp_gen_sack(asoc
, force
, commands
);
1159 case SCTP_CMD_PROCESS_SACK
:
1160 /* Process an inbound SACK. */
1161 error
= sctp_cmd_process_sack(commands
, asoc
,
1165 case SCTP_CMD_GEN_INIT_ACK
:
1166 /* Generate an INIT ACK chunk. */
1167 new_obj
= sctp_make_init_ack(asoc
, chunk
, GFP_ATOMIC
,
1172 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1173 SCTP_CHUNK(new_obj
));
1176 case SCTP_CMD_PEER_INIT
:
1177 /* Process a unified INIT from the peer.
1178 * Note: Only used during INIT-ACK processing. If
1179 * there is an error just return to the outter
1180 * layer which will bail.
1182 error
= sctp_cmd_process_init(commands
, asoc
, chunk
,
1186 case SCTP_CMD_GEN_COOKIE_ECHO
:
1187 /* Generate a COOKIE ECHO chunk. */
1188 new_obj
= sctp_make_cookie_echo(asoc
, chunk
);
1191 sctp_chunk_free(cmd
->obj
.ptr
);
1194 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1195 SCTP_CHUNK(new_obj
));
1197 /* If there is an ERROR chunk to be sent along with
1198 * the COOKIE_ECHO, send it, too.
1201 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1202 SCTP_CHUNK(cmd
->obj
.ptr
));
1204 /* FIXME - Eventually come up with a cleaner way to
1205 * enabling COOKIE-ECHO + DATA bundling during
1206 * multihoming stale cookie scenarios, the following
1207 * command plays with asoc->peer.retran_path to
1208 * avoid the problem of sending the COOKIE-ECHO and
1209 * DATA in different paths, which could result
1210 * in the association being ABORTed if the DATA chunk
1211 * is processed first by the server. Checking the
1212 * init error counter simply causes this command
1213 * to be executed only during failed attempts of
1214 * association establishment.
1216 if ((asoc
->peer
.retran_path
!=
1217 asoc
->peer
.primary_path
) &&
1218 (asoc
->init_err_counter
> 0)) {
1219 sctp_add_cmd_sf(commands
,
1220 SCTP_CMD_FORCE_PRIM_RETRAN
,
1226 case SCTP_CMD_GEN_SHUTDOWN
:
1227 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1228 * Reset error counts.
1230 asoc
->overall_error_count
= 0;
1232 /* Generate a SHUTDOWN chunk. */
1233 new_obj
= sctp_make_shutdown(asoc
, chunk
);
1236 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1237 SCTP_CHUNK(new_obj
));
1240 case SCTP_CMD_CHUNK_ULP
:
1241 /* Send a chunk to the sockets layer. */
1242 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1243 "chunk_up:", cmd
->obj
.ptr
,
1244 "ulpq:", &asoc
->ulpq
);
1245 sctp_ulpq_tail_data(&asoc
->ulpq
, cmd
->obj
.ptr
,
1249 case SCTP_CMD_EVENT_ULP
:
1250 /* Send a notification to the sockets layer. */
1251 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1252 "event_up:",cmd
->obj
.ptr
,
1253 "ulpq:",&asoc
->ulpq
);
1254 sctp_ulpq_tail_event(&asoc
->ulpq
, cmd
->obj
.ptr
);
1257 case SCTP_CMD_REPLY
:
1258 /* If an caller has not already corked, do cork. */
1259 if (!asoc
->outqueue
.cork
) {
1260 sctp_outq_cork(&asoc
->outqueue
);
1263 /* Send a chunk to our peer. */
1264 error
= sctp_outq_tail(&asoc
->outqueue
, cmd
->obj
.ptr
);
1267 case SCTP_CMD_SEND_PKT
:
1268 /* Send a full packet to our peer. */
1269 packet
= cmd
->obj
.ptr
;
1270 sctp_packet_transmit(packet
);
1271 sctp_ootb_pkt_free(packet
);
1274 case SCTP_CMD_T1_RETRAN
:
1275 /* Mark a transport for retransmission. */
1276 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1280 case SCTP_CMD_RETRAN
:
1281 /* Mark a transport for retransmission. */
1282 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1286 case SCTP_CMD_TRANSMIT
:
1287 /* Kick start transmission. */
1288 error
= sctp_outq_uncork(&asoc
->outqueue
);
1292 case SCTP_CMD_ECN_CE
:
1293 /* Do delayed CE processing. */
1294 sctp_do_ecn_ce_work(asoc
, cmd
->obj
.u32
);
1297 case SCTP_CMD_ECN_ECNE
:
1298 /* Do delayed ECNE processing. */
1299 new_obj
= sctp_do_ecn_ecne_work(asoc
, cmd
->obj
.u32
,
1302 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1303 SCTP_CHUNK(new_obj
));
1306 case SCTP_CMD_ECN_CWR
:
1307 /* Do delayed CWR processing. */
1308 sctp_do_ecn_cwr_work(asoc
, cmd
->obj
.u32
);
1311 case SCTP_CMD_SETUP_T2
:
1312 sctp_cmd_setup_t2(commands
, asoc
, cmd
->obj
.ptr
);
1315 case SCTP_CMD_TIMER_START
:
1316 timer
= &asoc
->timers
[cmd
->obj
.to
];
1317 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1320 timer
->expires
= jiffies
+ timeout
;
1321 sctp_association_hold(asoc
);
1325 case SCTP_CMD_TIMER_RESTART
:
1326 timer
= &asoc
->timers
[cmd
->obj
.to
];
1327 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1328 if (!mod_timer(timer
, jiffies
+ timeout
))
1329 sctp_association_hold(asoc
);
1332 case SCTP_CMD_TIMER_STOP
:
1333 timer
= &asoc
->timers
[cmd
->obj
.to
];
1334 if (timer_pending(timer
) && del_timer(timer
))
1335 sctp_association_put(asoc
);
1338 case SCTP_CMD_INIT_CHOOSE_TRANSPORT
:
1339 chunk
= cmd
->obj
.ptr
;
1340 t
= sctp_assoc_choose_init_transport(asoc
);
1341 asoc
->init_last_sent_to
= t
;
1342 chunk
->transport
= t
;
1343 t
->init_sent_count
++;
1346 case SCTP_CMD_INIT_RESTART
:
1347 /* Do the needed accounting and updates
1348 * associated with restarting an initialization
1349 * timer. Only multiply the timeout by two if
1350 * all transports have been tried at the current
1353 t
= asoc
->init_last_sent_to
;
1354 asoc
->init_err_counter
++;
1356 if (t
->init_sent_count
> (asoc
->init_cycle
+ 1)) {
1357 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] *= 2;
1358 if (asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] >
1359 asoc
->max_init_timeo
) {
1360 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] =
1361 asoc
->max_init_timeo
;
1365 "T1 INIT Timeout adjustment"
1366 " init_err_counter: %d"
1369 asoc
->init_err_counter
,
1371 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
]);
1374 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
1375 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT
));
1378 case SCTP_CMD_COOKIEECHO_RESTART
:
1379 /* Do the needed accounting and updates
1380 * associated with restarting an initialization
1381 * timer. Only multiply the timeout by two if
1382 * all transports have been tried at the current
1385 asoc
->init_err_counter
++;
1387 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] *= 2;
1388 if (asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] >
1389 asoc
->max_init_timeo
) {
1390 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] =
1391 asoc
->max_init_timeo
;
1394 "T1 COOKIE Timeout adjustment"
1395 " init_err_counter: %d"
1397 asoc
->init_err_counter
,
1398 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
]);
1400 /* If we've sent any data bundled with
1401 * COOKIE-ECHO we need to resend.
1403 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
1405 sctp_retransmit_mark(&asoc
->outqueue
, t
,
1409 sctp_add_cmd_sf(commands
,
1410 SCTP_CMD_TIMER_RESTART
,
1411 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE
));
1414 case SCTP_CMD_INIT_FAILED
:
1415 sctp_cmd_init_failed(commands
, asoc
, cmd
->obj
.err
);
1418 case SCTP_CMD_ASSOC_FAILED
:
1419 sctp_cmd_assoc_failed(commands
, asoc
, event_type
,
1420 subtype
, chunk
, cmd
->obj
.err
);
1423 case SCTP_CMD_INIT_COUNTER_INC
:
1424 asoc
->init_err_counter
++;
1427 case SCTP_CMD_INIT_COUNTER_RESET
:
1428 asoc
->init_err_counter
= 0;
1429 asoc
->init_cycle
= 0;
1432 case SCTP_CMD_REPORT_DUP
:
1433 sctp_tsnmap_mark_dup(&asoc
->peer
.tsn_map
,
1437 case SCTP_CMD_REPORT_BAD_TAG
:
1438 SCTP_DEBUG_PRINTK("vtag mismatch!\n");
1441 case SCTP_CMD_STRIKE
:
1442 /* Mark one strike against a transport. */
1443 sctp_do_8_2_transport_strike(asoc
, cmd
->obj
.transport
);
1446 case SCTP_CMD_TRANSPORT_RESET
:
1447 t
= cmd
->obj
.transport
;
1448 sctp_cmd_transport_reset(commands
, asoc
, t
);
1451 case SCTP_CMD_TRANSPORT_ON
:
1452 t
= cmd
->obj
.transport
;
1453 sctp_cmd_transport_on(commands
, asoc
, t
, chunk
);
1456 case SCTP_CMD_HB_TIMERS_START
:
1457 sctp_cmd_hb_timers_start(commands
, asoc
);
1460 case SCTP_CMD_HB_TIMER_UPDATE
:
1461 t
= cmd
->obj
.transport
;
1462 sctp_cmd_hb_timer_update(commands
, t
);
1465 case SCTP_CMD_HB_TIMERS_STOP
:
1466 sctp_cmd_hb_timers_stop(commands
, asoc
);
1469 case SCTP_CMD_REPORT_ERROR
:
1470 error
= cmd
->obj
.error
;
1473 case SCTP_CMD_PROCESS_CTSN
:
1474 /* Dummy up a SACK for processing. */
1475 sackh
.cum_tsn_ack
= cmd
->obj
.be32
;
1477 sackh
.num_gap_ack_blocks
= 0;
1478 sackh
.num_dup_tsns
= 0;
1479 sctp_add_cmd_sf(commands
, SCTP_CMD_PROCESS_SACK
,
1480 SCTP_SACKH(&sackh
));
1483 case SCTP_CMD_DISCARD_PACKET
:
1484 /* We need to discard the whole packet. */
1485 chunk
->pdiscard
= 1;
1488 case SCTP_CMD_RTO_PENDING
:
1489 t
= cmd
->obj
.transport
;
1493 case SCTP_CMD_PART_DELIVER
:
1494 sctp_ulpq_partial_delivery(&asoc
->ulpq
, cmd
->obj
.ptr
,
1498 case SCTP_CMD_RENEGE
:
1499 sctp_ulpq_renege(&asoc
->ulpq
, cmd
->obj
.ptr
,
1503 case SCTP_CMD_SETUP_T4
:
1504 sctp_cmd_setup_t4(commands
, asoc
, cmd
->obj
.ptr
);
1507 case SCTP_CMD_PROCESS_OPERR
:
1508 sctp_cmd_process_operr(commands
, asoc
, chunk
);
1510 case SCTP_CMD_CLEAR_INIT_TAG
:
1511 asoc
->peer
.i
.init_tag
= 0;
1513 case SCTP_CMD_DEL_NON_PRIMARY
:
1514 sctp_cmd_del_non_primary(asoc
);
1516 case SCTP_CMD_T3_RTX_TIMERS_STOP
:
1517 sctp_cmd_t3_rtx_timers_stop(commands
, asoc
);
1519 case SCTP_CMD_FORCE_PRIM_RETRAN
:
1520 t
= asoc
->peer
.retran_path
;
1521 asoc
->peer
.retran_path
= asoc
->peer
.primary_path
;
1522 error
= sctp_outq_uncork(&asoc
->outqueue
);
1524 asoc
->peer
.retran_path
= t
;
1526 case SCTP_CMD_SET_SK_ERR
:
1527 sctp_cmd_set_sk_err(asoc
, cmd
->obj
.error
);
1529 case SCTP_CMD_ASSOC_CHANGE
:
1530 sctp_cmd_assoc_change(commands
, asoc
,
1533 case SCTP_CMD_ADAPTATION_IND
:
1534 sctp_cmd_adaptation_ind(commands
, asoc
);
1537 case SCTP_CMD_ASSOC_SHKEY
:
1538 error
= sctp_auth_asoc_init_active_key(asoc
,
1541 case SCTP_CMD_UPDATE_INITTAG
:
1542 asoc
->peer
.i
.init_tag
= cmd
->obj
.u32
;
1546 printk(KERN_WARNING
"Impossible command: %u, %p\n",
1547 cmd
->verb
, cmd
->obj
.ptr
);
1557 sctp_outq_uncork(&asoc
->outqueue
);