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>
54 #include <linux/gfp.h>
56 #include <net/sctp/sctp.h>
57 #include <net/sctp/sm.h>
59 static int sctp_cmd_interpreter(sctp_event_t event_type
,
60 sctp_subtype_t subtype
,
62 struct sctp_endpoint
*ep
,
63 struct sctp_association
*asoc
,
65 sctp_disposition_t status
,
66 sctp_cmd_seq_t
*commands
,
68 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
70 struct sctp_endpoint
*ep
,
71 struct sctp_association
*asoc
,
73 sctp_disposition_t status
,
74 sctp_cmd_seq_t
*commands
,
77 /********************************************************************
79 ********************************************************************/
81 /* A helper function for delayed processing of INET ECN CE bit. */
82 static void sctp_do_ecn_ce_work(struct sctp_association
*asoc
,
85 /* Save the TSN away for comparison when we receive CWR */
87 asoc
->last_ecne_tsn
= lowest_tsn
;
91 /* Helper function for delayed processing of SCTP ECNE chunk. */
92 /* RFC 2960 Appendix A
94 * RFC 2481 details a specific bit for a sender to send in
95 * the header of its next outbound TCP segment to indicate to
96 * its peer that it has reduced its congestion window. This
97 * is termed the CWR bit. For SCTP the same indication is made
98 * by including the CWR chunk. This chunk contains one data
99 * element, i.e. the TSN number that was sent in the ECNE chunk.
100 * This element represents the lowest TSN number in the datagram
101 * that was originally marked with the CE bit.
103 static struct sctp_chunk
*sctp_do_ecn_ecne_work(struct sctp_association
*asoc
,
105 struct sctp_chunk
*chunk
)
107 struct sctp_chunk
*repl
;
109 /* Our previously transmitted packet ran into some congestion
110 * so we should take action by reducing cwnd and ssthresh
111 * and then ACK our peer that we we've done so by
115 /* First, try to determine if we want to actually lower
116 * our cwnd variables. Only lower them if the ECNE looks more
117 * recent than the last response.
119 if (TSN_lt(asoc
->last_cwr_tsn
, lowest_tsn
)) {
120 struct sctp_transport
*transport
;
122 /* Find which transport's congestion variables
123 * need to be adjusted.
125 transport
= sctp_assoc_lookup_tsn(asoc
, lowest_tsn
);
127 /* Update the congestion variables. */
129 sctp_transport_lower_cwnd(transport
,
130 SCTP_LOWER_CWND_ECNE
);
131 asoc
->last_cwr_tsn
= lowest_tsn
;
134 /* Always try to quiet the other end. In case of lost CWR,
135 * resend last_cwr_tsn.
137 repl
= sctp_make_cwr(asoc
, asoc
->last_cwr_tsn
, chunk
);
139 /* If we run out of memory, it will look like a lost CWR. We'll
140 * get back in sync eventually.
145 /* Helper function to do delayed processing of ECN CWR chunk. */
146 static void sctp_do_ecn_cwr_work(struct sctp_association
*asoc
,
149 /* Turn off ECNE getting auto-prepended to every outgoing
155 /* Generate SACK if necessary. We call this at the end of a packet. */
156 static int sctp_gen_sack(struct sctp_association
*asoc
, int force
,
157 sctp_cmd_seq_t
*commands
)
159 __u32 ctsn
, max_tsn_seen
;
160 struct sctp_chunk
*sack
;
161 struct sctp_transport
*trans
= asoc
->peer
.last_data_from
;
165 (!trans
&& (asoc
->param_flags
& SPP_SACKDELAY_DISABLE
)) ||
166 (trans
&& (trans
->param_flags
& SPP_SACKDELAY_DISABLE
)))
167 asoc
->peer
.sack_needed
= 1;
169 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
170 max_tsn_seen
= sctp_tsnmap_get_max_tsn_seen(&asoc
->peer
.tsn_map
);
172 /* From 12.2 Parameters necessary per association (i.e. the TCB):
174 * Ack State : This flag indicates if the next received packet
175 * : is to be responded to with a SACK. ...
176 * : When DATA chunks are out of order, SACK's
177 * : are not delayed (see Section 6).
179 * [This is actually not mentioned in Section 6, but we
180 * implement it here anyway. --piggy]
182 if (max_tsn_seen
!= ctsn
)
183 asoc
->peer
.sack_needed
= 1;
185 /* From 6.2 Acknowledgement on Reception of DATA Chunks:
187 * Section 4.2 of [RFC2581] SHOULD be followed. Specifically,
188 * an acknowledgement SHOULD be generated for at least every
189 * second packet (not every second DATA chunk) received, and
190 * SHOULD be generated within 200 ms of the arrival of any
191 * unacknowledged DATA chunk. ...
193 if (!asoc
->peer
.sack_needed
) {
194 asoc
->peer
.sack_cnt
++;
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 /* We will need a SACK for the next packet. */
203 if (asoc
->peer
.sack_cnt
>= trans
->sackfreq
- 1)
204 asoc
->peer
.sack_needed
= 1;
206 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
209 /* We will need a SACK for the next packet. */
210 if (asoc
->peer
.sack_cnt
>= asoc
->sackfreq
- 1)
211 asoc
->peer
.sack_needed
= 1;
213 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
217 /* Restart the SACK timer. */
218 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
219 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
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 /* Handle the timeout of the ICMP protocol unreachable timer. Trigger
401 * the correct state machine transition that will close the association.
403 void sctp_generate_proto_unreach_event(unsigned long data
)
405 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
406 struct sctp_association
*asoc
= transport
->asoc
;
408 sctp_bh_lock_sock(asoc
->base
.sk
);
409 if (sock_owned_by_user(asoc
->base
.sk
)) {
410 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__
);
412 /* Try again later. */
413 if (!mod_timer(&transport
->proto_unreach_timer
,
415 sctp_association_hold(asoc
);
419 /* Is this structure just waiting around for us to actually
425 sctp_do_sm(SCTP_EVENT_T_OTHER
,
426 SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH
),
427 asoc
->state
, asoc
->ep
, asoc
, transport
, GFP_ATOMIC
);
430 sctp_bh_unlock_sock(asoc
->base
.sk
);
431 sctp_association_put(asoc
);
435 /* Inject a SACK Timeout event into the state machine. */
436 static void sctp_generate_sack_event(unsigned long data
)
438 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
439 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_SACK
);
442 sctp_timer_event_t
*sctp_timer_events
[SCTP_NUM_TIMEOUT_TYPES
] = {
444 sctp_generate_t1_cookie_event
,
445 sctp_generate_t1_init_event
,
446 sctp_generate_t2_shutdown_event
,
448 sctp_generate_t4_rto_event
,
449 sctp_generate_t5_shutdown_guard_event
,
451 sctp_generate_sack_event
,
452 sctp_generate_autoclose_event
,
456 /* RFC 2960 8.2 Path Failure Detection
458 * When its peer endpoint is multi-homed, an endpoint should keep a
459 * error counter for each of the destination transport addresses of the
462 * Each time the T3-rtx timer expires on any address, or when a
463 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
464 * the error counter of that destination address will be incremented.
465 * When the value in the error counter exceeds the protocol parameter
466 * 'Path.Max.Retrans' of that destination address, the endpoint should
467 * mark the destination transport address as inactive, and a
468 * notification SHOULD be sent to the upper layer.
471 static void sctp_do_8_2_transport_strike(struct sctp_association
*asoc
,
472 struct sctp_transport
*transport
,
475 /* The check for association's overall error counter exceeding the
476 * threshold is done in the state function.
478 /* We are here due to a timer expiration. If the timer was
479 * not a HEARTBEAT, then normal error tracking is done.
480 * If the timer was a heartbeat, we only increment error counts
481 * when we already have an outstanding HEARTBEAT that has not
483 * Additionaly, some tranport states inhibit error increments.
486 asoc
->overall_error_count
++;
487 if (transport
->state
!= SCTP_INACTIVE
)
488 transport
->error_count
++;
489 } else if (transport
->hb_sent
) {
490 if (transport
->state
!= SCTP_UNCONFIRMED
)
491 asoc
->overall_error_count
++;
492 if (transport
->state
!= SCTP_INACTIVE
)
493 transport
->error_count
++;
496 if (transport
->state
!= SCTP_INACTIVE
&&
497 (transport
->error_count
> transport
->pathmaxrxt
)) {
498 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
499 " transport IP: port:%d failed.\n",
501 (&transport
->ipaddr
),
502 ntohs(transport
->ipaddr
.v4
.sin_port
));
503 sctp_assoc_control_transport(asoc
, transport
,
505 SCTP_FAILED_THRESHOLD
);
508 /* E2) For the destination address for which the timer
509 * expires, set RTO <- RTO * 2 ("back off the timer"). The
510 * maximum value discussed in rule C7 above (RTO.max) may be
511 * used to provide an upper bound to this doubling operation.
513 * Special Case: the first HB doesn't trigger exponential backoff.
514 * The first unacknowledged HB triggers it. We do this with a flag
515 * that indicates that we have an outstanding HB.
517 if (!is_hb
|| transport
->hb_sent
) {
518 transport
->rto
= min((transport
->rto
* 2), transport
->asoc
->rto_max
);
522 /* Worker routine to handle INIT command failure. */
523 static void sctp_cmd_init_failed(sctp_cmd_seq_t
*commands
,
524 struct sctp_association
*asoc
,
527 struct sctp_ulpevent
*event
;
529 event
= sctp_ulpevent_make_assoc_change(asoc
,0, SCTP_CANT_STR_ASSOC
,
530 (__u16
)error
, 0, 0, NULL
,
534 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
535 SCTP_ULPEVENT(event
));
537 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
538 SCTP_STATE(SCTP_STATE_CLOSED
));
540 /* SEND_FAILED sent later when cleaning up the association. */
541 asoc
->outqueue
.error
= error
;
542 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
545 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
546 static void sctp_cmd_assoc_failed(sctp_cmd_seq_t
*commands
,
547 struct sctp_association
*asoc
,
548 sctp_event_t event_type
,
549 sctp_subtype_t subtype
,
550 struct sctp_chunk
*chunk
,
553 struct sctp_ulpevent
*event
;
555 /* Cancel any partial delivery in progress. */
556 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
558 if (event_type
== SCTP_EVENT_T_CHUNK
&& subtype
.chunk
== SCTP_CID_ABORT
)
559 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
560 (__u16
)error
, 0, 0, chunk
,
563 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
564 (__u16
)error
, 0, 0, NULL
,
567 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
568 SCTP_ULPEVENT(event
));
570 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
571 SCTP_STATE(SCTP_STATE_CLOSED
));
573 /* SEND_FAILED sent later when cleaning up the association. */
574 asoc
->outqueue
.error
= error
;
575 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
578 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
579 * inside the cookie. In reality, this is only used for INIT-ACK processing
580 * since all other cases use "temporary" associations and can do all
581 * their work in statefuns directly.
583 static int sctp_cmd_process_init(sctp_cmd_seq_t
*commands
,
584 struct sctp_association
*asoc
,
585 struct sctp_chunk
*chunk
,
586 sctp_init_chunk_t
*peer_init
,
591 /* We only process the init as a sideeffect in a single
592 * case. This is when we process the INIT-ACK. If we
593 * fail during INIT processing (due to malloc problems),
594 * just return the error and stop processing the stack.
596 if (!sctp_process_init(asoc
, chunk
->chunk_hdr
->type
,
597 sctp_source(chunk
), peer_init
, gfp
))
605 /* Helper function to break out starting up of heartbeat timers. */
606 static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t
*cmds
,
607 struct sctp_association
*asoc
)
609 struct sctp_transport
*t
;
611 /* Start a heartbeat timer for each transport on the association.
612 * hold a reference on the transport to make sure none of
613 * the needed data structures go away.
615 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
, transports
) {
617 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
618 sctp_transport_hold(t
);
622 static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t
*cmds
,
623 struct sctp_association
*asoc
)
625 struct sctp_transport
*t
;
627 /* Stop all heartbeat timers. */
629 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
631 if (del_timer(&t
->hb_timer
))
632 sctp_transport_put(t
);
636 /* Helper function to stop any pending T3-RTX timers */
637 static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t
*cmds
,
638 struct sctp_association
*asoc
)
640 struct sctp_transport
*t
;
642 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
644 if (timer_pending(&t
->T3_rtx_timer
) &&
645 del_timer(&t
->T3_rtx_timer
)) {
646 sctp_transport_put(t
);
652 /* Helper function to update the heartbeat timer. */
653 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t
*cmds
,
654 struct sctp_transport
*t
)
656 /* Update the heartbeat timer. */
657 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
658 sctp_transport_hold(t
);
661 /* Helper function to handle the reception of an HEARTBEAT ACK. */
662 static void sctp_cmd_transport_on(sctp_cmd_seq_t
*cmds
,
663 struct sctp_association
*asoc
,
664 struct sctp_transport
*t
,
665 struct sctp_chunk
*chunk
)
667 sctp_sender_hb_info_t
*hbinfo
;
669 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
670 * HEARTBEAT should clear the error counter of the destination
671 * transport address to which the HEARTBEAT was sent.
676 * Although RFC4960 specifies that the overall error count must
677 * be cleared when a HEARTBEAT ACK is received, we make an
678 * exception while in SHUTDOWN PENDING. If the peer keeps its
679 * window shut forever, we may never be able to transmit our
680 * outstanding data and rely on the retransmission limit be reached
681 * to shutdown the association.
683 if (t
->asoc
->state
!= SCTP_STATE_SHUTDOWN_PENDING
)
684 t
->asoc
->overall_error_count
= 0;
686 /* Clear the hb_sent flag to signal that we had a good
691 /* Mark the destination transport address as active if it is not so
694 if ((t
->state
== SCTP_INACTIVE
) || (t
->state
== SCTP_UNCONFIRMED
))
695 sctp_assoc_control_transport(asoc
, t
, SCTP_TRANSPORT_UP
,
696 SCTP_HEARTBEAT_SUCCESS
);
698 /* The receiver of the HEARTBEAT ACK should also perform an
699 * RTT measurement for that destination transport address
700 * using the time value carried in the HEARTBEAT ACK chunk.
701 * If the transport's rto_pending variable has been cleared,
702 * it was most likely due to a retransmit. However, we want
703 * to re-enable it to properly update the rto.
705 if (t
->rto_pending
== 0)
708 hbinfo
= (sctp_sender_hb_info_t
*) chunk
->skb
->data
;
709 sctp_transport_update_rto(t
, (jiffies
- hbinfo
->sent_at
));
711 /* Update the heartbeat timer. */
712 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
713 sctp_transport_hold(t
);
717 /* Helper function to process the process SACK command. */
718 static int sctp_cmd_process_sack(sctp_cmd_seq_t
*cmds
,
719 struct sctp_association
*asoc
,
720 struct sctp_sackhdr
*sackh
)
724 if (sctp_outq_sack(&asoc
->outqueue
, sackh
)) {
725 /* There are no more TSNs awaiting SACK. */
726 err
= sctp_do_sm(SCTP_EVENT_T_OTHER
,
727 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN
),
728 asoc
->state
, asoc
->ep
, asoc
, NULL
,
735 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
736 * the transport for a shutdown chunk.
738 static void sctp_cmd_setup_t2(sctp_cmd_seq_t
*cmds
,
739 struct sctp_association
*asoc
,
740 struct sctp_chunk
*chunk
)
742 struct sctp_transport
*t
;
744 t
= sctp_assoc_choose_alter_transport(asoc
,
745 asoc
->shutdown_last_sent_to
);
746 asoc
->shutdown_last_sent_to
= t
;
747 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
] = t
->rto
;
748 chunk
->transport
= t
;
751 /* Helper function to change the state of an association. */
752 static void sctp_cmd_new_state(sctp_cmd_seq_t
*cmds
,
753 struct sctp_association
*asoc
,
756 struct sock
*sk
= asoc
->base
.sk
;
760 SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n",
761 asoc
, sctp_state_tbl
[state
]);
763 if (sctp_style(sk
, TCP
)) {
764 /* Change the sk->sk_state of a TCP-style socket that has
765 * successfully completed a connect() call.
767 if (sctp_state(asoc
, ESTABLISHED
) && sctp_sstate(sk
, CLOSED
))
768 sk
->sk_state
= SCTP_SS_ESTABLISHED
;
770 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
771 if (sctp_state(asoc
, SHUTDOWN_RECEIVED
) &&
772 sctp_sstate(sk
, ESTABLISHED
))
773 sk
->sk_shutdown
|= RCV_SHUTDOWN
;
776 if (sctp_state(asoc
, COOKIE_WAIT
)) {
777 /* Reset init timeouts since they may have been
778 * increased due to timer expirations.
780 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] =
782 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] =
786 if (sctp_state(asoc
, ESTABLISHED
) ||
787 sctp_state(asoc
, CLOSED
) ||
788 sctp_state(asoc
, SHUTDOWN_RECEIVED
)) {
789 /* Wake up any processes waiting in the asoc's wait queue in
790 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
792 if (waitqueue_active(&asoc
->wait
))
793 wake_up_interruptible(&asoc
->wait
);
795 /* Wake up any processes waiting in the sk's sleep queue of
796 * a TCP-style or UDP-style peeled-off socket in
797 * sctp_wait_for_accept() or sctp_wait_for_packet().
798 * For a UDP-style socket, the waiters are woken up by the
801 if (!sctp_style(sk
, UDP
))
802 sk
->sk_state_change(sk
);
806 /* Helper function to delete an association. */
807 static void sctp_cmd_delete_tcb(sctp_cmd_seq_t
*cmds
,
808 struct sctp_association
*asoc
)
810 struct sock
*sk
= asoc
->base
.sk
;
812 /* If it is a non-temporary association belonging to a TCP-style
813 * listening socket that is not closed, do not free it so that accept()
814 * can pick it up later.
816 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
) &&
817 (!asoc
->temp
) && (sk
->sk_shutdown
!= SHUTDOWN_MASK
))
820 sctp_unhash_established(asoc
);
821 sctp_association_free(asoc
);
825 * ADDIP Section 4.1 ASCONF Chunk Procedures
826 * A4) Start a T-4 RTO timer, using the RTO value of the selected
827 * destination address (we use active path instead of primary path just
828 * because primary path may be inactive.
830 static void sctp_cmd_setup_t4(sctp_cmd_seq_t
*cmds
,
831 struct sctp_association
*asoc
,
832 struct sctp_chunk
*chunk
)
834 struct sctp_transport
*t
;
836 t
= sctp_assoc_choose_alter_transport(asoc
, chunk
->transport
);
837 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T4_RTO
] = t
->rto
;
838 chunk
->transport
= t
;
841 /* Process an incoming Operation Error Chunk. */
842 static void sctp_cmd_process_operr(sctp_cmd_seq_t
*cmds
,
843 struct sctp_association
*asoc
,
844 struct sctp_chunk
*chunk
)
846 struct sctp_errhdr
*err_hdr
;
847 struct sctp_ulpevent
*ev
;
849 while (chunk
->chunk_end
> chunk
->skb
->data
) {
850 err_hdr
= (struct sctp_errhdr
*)(chunk
->skb
->data
);
852 ev
= sctp_ulpevent_make_remote_error(asoc
, chunk
, 0,
857 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
859 switch (err_hdr
->cause
) {
860 case SCTP_ERROR_UNKNOWN_CHUNK
:
862 sctp_chunkhdr_t
*unk_chunk_hdr
;
864 unk_chunk_hdr
= (sctp_chunkhdr_t
*)err_hdr
->variable
;
865 switch (unk_chunk_hdr
->type
) {
866 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with
867 * an ERROR chunk reporting that it did not recognized
868 * the ASCONF chunk type, the sender of the ASCONF MUST
869 * NOT send any further ASCONF chunks and MUST stop its
872 case SCTP_CID_ASCONF
:
873 if (asoc
->peer
.asconf_capable
== 0)
876 asoc
->peer
.asconf_capable
= 0;
877 sctp_add_cmd_sf(cmds
, SCTP_CMD_TIMER_STOP
,
878 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO
));
891 /* Process variable FWDTSN chunk information. */
892 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq
*ulpq
,
893 struct sctp_chunk
*chunk
)
895 struct sctp_fwdtsn_skip
*skip
;
896 /* Walk through all the skipped SSNs */
897 sctp_walk_fwdtsn(skip
, chunk
) {
898 sctp_ulpq_skip(ulpq
, ntohs(skip
->stream
), ntohs(skip
->ssn
));
904 /* Helper function to remove the association non-primary peer
907 static void sctp_cmd_del_non_primary(struct sctp_association
*asoc
)
909 struct sctp_transport
*t
;
910 struct list_head
*pos
;
911 struct list_head
*temp
;
913 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
914 t
= list_entry(pos
, struct sctp_transport
, transports
);
915 if (!sctp_cmp_addr_exact(&t
->ipaddr
,
916 &asoc
->peer
.primary_addr
)) {
917 sctp_assoc_del_peer(asoc
, &t
->ipaddr
);
924 /* Helper function to set sk_err on a 1-1 style socket. */
925 static void sctp_cmd_set_sk_err(struct sctp_association
*asoc
, int error
)
927 struct sock
*sk
= asoc
->base
.sk
;
929 if (!sctp_style(sk
, UDP
))
933 /* Helper function to generate an association change event */
934 static void sctp_cmd_assoc_change(sctp_cmd_seq_t
*commands
,
935 struct sctp_association
*asoc
,
938 struct sctp_ulpevent
*ev
;
940 ev
= sctp_ulpevent_make_assoc_change(asoc
, 0, state
, 0,
941 asoc
->c
.sinit_num_ostreams
,
942 asoc
->c
.sinit_max_instreams
,
945 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
948 /* Helper function to generate an adaptation indication event */
949 static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t
*commands
,
950 struct sctp_association
*asoc
)
952 struct sctp_ulpevent
*ev
;
954 ev
= sctp_ulpevent_make_adaptation_indication(asoc
, GFP_ATOMIC
);
957 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
961 static void sctp_cmd_t1_timer_update(struct sctp_association
*asoc
,
962 sctp_event_timeout_t timer
,
965 struct sctp_transport
*t
;
967 t
= asoc
->init_last_sent_to
;
968 asoc
->init_err_counter
++;
970 if (t
->init_sent_count
> (asoc
->init_cycle
+ 1)) {
971 asoc
->timeouts
[timer
] *= 2;
972 if (asoc
->timeouts
[timer
] > asoc
->max_init_timeo
) {
973 asoc
->timeouts
[timer
] = asoc
->max_init_timeo
;
977 "T1 %s Timeout adjustment"
978 " init_err_counter: %d"
982 asoc
->init_err_counter
,
984 asoc
->timeouts
[timer
]);
989 /* Send the whole message, chunk by chunk, to the outqueue.
990 * This way the whole message is queued up and bundling if
991 * encouraged for small fragments.
993 static int sctp_cmd_send_msg(struct sctp_association
*asoc
,
994 struct sctp_datamsg
*msg
)
996 struct sctp_chunk
*chunk
;
999 list_for_each_entry(chunk
, &msg
->chunks
, frag_list
) {
1000 error
= sctp_outq_tail(&asoc
->outqueue
, chunk
);
1009 /* Sent the next ASCONF packet currently stored in the association.
1010 * This happens after the ASCONF_ACK was succeffully processed.
1012 static void sctp_cmd_send_asconf(struct sctp_association
*asoc
)
1014 /* Send the next asconf chunk from the addip chunk
1017 if (!list_empty(&asoc
->addip_chunk_list
)) {
1018 struct list_head
*entry
= asoc
->addip_chunk_list
.next
;
1019 struct sctp_chunk
*asconf
= list_entry(entry
,
1020 struct sctp_chunk
, list
);
1021 list_del_init(entry
);
1023 /* Hold the chunk until an ASCONF_ACK is received. */
1024 sctp_chunk_hold(asconf
);
1025 if (sctp_primitive_ASCONF(asoc
, asconf
))
1026 sctp_chunk_free(asconf
);
1028 asoc
->addip_last_asconf
= asconf
;
1033 /* These three macros allow us to pull the debugging code out of the
1034 * main flow of sctp_do_sm() to keep attention focused on the real
1035 * functionality there.
1038 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
1039 "ep %p, %s, %s, asoc %p[%s], %s\n", \
1040 ep, sctp_evttype_tbl[event_type], \
1041 (*debug_fn)(subtype), asoc, \
1042 sctp_state_tbl[state], state_fn->name)
1044 #define DEBUG_POST \
1045 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
1046 "asoc %p, status: %s\n", \
1047 asoc, sctp_status_tbl[status])
1049 #define DEBUG_POST_SFX \
1050 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
1052 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
1053 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
1056 * This is the master state machine processing function.
1058 * If you want to understand all of lksctp, this is a
1059 * good place to start.
1061 int sctp_do_sm(sctp_event_t event_type
, sctp_subtype_t subtype
,
1063 struct sctp_endpoint
*ep
,
1064 struct sctp_association
*asoc
,
1068 sctp_cmd_seq_t commands
;
1069 const sctp_sm_table_entry_t
*state_fn
;
1070 sctp_disposition_t status
;
1072 typedef const char *(printfn_t
)(sctp_subtype_t
);
1074 static printfn_t
*table
[] = {
1075 NULL
, sctp_cname
, sctp_tname
, sctp_oname
, sctp_pname
,
1077 printfn_t
*debug_fn
__attribute__ ((unused
)) = table
[event_type
];
1079 /* Look up the state function, run it, and then process the
1080 * side effects. These three steps are the heart of lksctp.
1082 state_fn
= sctp_sm_lookup_event(event_type
, state
, subtype
);
1084 sctp_init_cmd_seq(&commands
);
1087 status
= (*state_fn
->fn
)(ep
, asoc
, subtype
, event_arg
, &commands
);
1090 error
= sctp_side_effects(event_type
, subtype
, state
,
1091 ep
, asoc
, event_arg
, status
,
1101 /*****************************************************************
1102 * This the master state function side effect processing function.
1103 *****************************************************************/
1104 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
1106 struct sctp_endpoint
*ep
,
1107 struct sctp_association
*asoc
,
1109 sctp_disposition_t status
,
1110 sctp_cmd_seq_t
*commands
,
1115 /* FIXME - Most of the dispositions left today would be categorized
1116 * as "exceptional" dispositions. For those dispositions, it
1117 * may not be proper to run through any of the commands at all.
1118 * For example, the command interpreter might be run only with
1119 * disposition SCTP_DISPOSITION_CONSUME.
1121 if (0 != (error
= sctp_cmd_interpreter(event_type
, subtype
, state
,
1128 case SCTP_DISPOSITION_DISCARD
:
1129 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
1130 "event_type %d, event_id %d\n",
1131 state
, event_type
, subtype
.chunk
);
1134 case SCTP_DISPOSITION_NOMEM
:
1135 /* We ran out of memory, so we need to discard this
1138 /* BUG--we should now recover some memory, probably by
1144 case SCTP_DISPOSITION_DELETE_TCB
:
1145 /* This should now be a command. */
1148 case SCTP_DISPOSITION_CONSUME
:
1149 case SCTP_DISPOSITION_ABORT
:
1151 * We should no longer have much work to do here as the
1152 * real work has been done as explicit commands above.
1156 case SCTP_DISPOSITION_VIOLATION
:
1157 if (net_ratelimit())
1158 printk(KERN_ERR
"sctp protocol violation state %d "
1159 "chunkid %d\n", state
, subtype
.chunk
);
1162 case SCTP_DISPOSITION_NOT_IMPL
:
1163 printk(KERN_WARNING
"sctp unimplemented feature in state %d, "
1164 "event_type %d, event_id %d\n",
1165 state
, event_type
, subtype
.chunk
);
1168 case SCTP_DISPOSITION_BUG
:
1169 printk(KERN_ERR
"sctp bug in state %d, "
1170 "event_type %d, event_id %d\n",
1171 state
, event_type
, subtype
.chunk
);
1176 printk(KERN_ERR
"sctp impossible disposition %d "
1177 "in state %d, event_type %d, event_id %d\n",
1178 status
, state
, event_type
, subtype
.chunk
);
1187 /********************************************************************
1188 * 2nd Level Abstractions
1189 ********************************************************************/
1191 /* This is the side-effect interpreter. */
1192 static int sctp_cmd_interpreter(sctp_event_t event_type
,
1193 sctp_subtype_t subtype
,
1195 struct sctp_endpoint
*ep
,
1196 struct sctp_association
*asoc
,
1198 sctp_disposition_t status
,
1199 sctp_cmd_seq_t
*commands
,
1205 struct sctp_chunk
*new_obj
;
1206 struct sctp_chunk
*chunk
= NULL
;
1207 struct sctp_packet
*packet
;
1208 struct timer_list
*timer
;
1209 unsigned long timeout
;
1210 struct sctp_transport
*t
;
1211 struct sctp_sackhdr sackh
;
1214 if (SCTP_EVENT_T_TIMEOUT
!= event_type
)
1215 chunk
= (struct sctp_chunk
*) event_arg
;
1217 /* Note: This whole file is a huge candidate for rework.
1218 * For example, each command could either have its own handler, so
1219 * the loop would look like:
1221 * cmd->handle(x, y, z)
1224 while (NULL
!= (cmd
= sctp_next_cmd(commands
))) {
1225 switch (cmd
->verb
) {
1230 case SCTP_CMD_NEW_ASOC
:
1231 /* Register a new association. */
1233 sctp_outq_uncork(&asoc
->outqueue
);
1236 asoc
= cmd
->obj
.ptr
;
1237 /* Register with the endpoint. */
1238 sctp_endpoint_add_asoc(ep
, asoc
);
1239 sctp_hash_established(asoc
);
1242 case SCTP_CMD_UPDATE_ASSOC
:
1243 sctp_assoc_update(asoc
, cmd
->obj
.ptr
);
1246 case SCTP_CMD_PURGE_OUTQUEUE
:
1247 sctp_outq_teardown(&asoc
->outqueue
);
1250 case SCTP_CMD_DELETE_TCB
:
1252 sctp_outq_uncork(&asoc
->outqueue
);
1255 /* Delete the current association. */
1256 sctp_cmd_delete_tcb(commands
, asoc
);
1260 case SCTP_CMD_NEW_STATE
:
1261 /* Enter a new state. */
1262 sctp_cmd_new_state(commands
, asoc
, cmd
->obj
.state
);
1265 case SCTP_CMD_REPORT_TSN
:
1266 /* Record the arrival of a TSN. */
1267 error
= sctp_tsnmap_mark(&asoc
->peer
.tsn_map
,
1271 case SCTP_CMD_REPORT_FWDTSN
:
1272 /* Move the Cumulattive TSN Ack ahead. */
1273 sctp_tsnmap_skip(&asoc
->peer
.tsn_map
, cmd
->obj
.u32
);
1275 /* purge the fragmentation queue */
1276 sctp_ulpq_reasm_flushtsn(&asoc
->ulpq
, cmd
->obj
.u32
);
1278 /* Abort any in progress partial delivery. */
1279 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
1282 case SCTP_CMD_PROCESS_FWDTSN
:
1283 sctp_cmd_process_fwdtsn(&asoc
->ulpq
, cmd
->obj
.ptr
);
1286 case SCTP_CMD_GEN_SACK
:
1287 /* Generate a Selective ACK.
1288 * The argument tells us whether to just count
1289 * the packet and MAYBE generate a SACK, or
1292 force
= cmd
->obj
.i32
;
1293 error
= sctp_gen_sack(asoc
, force
, commands
);
1296 case SCTP_CMD_PROCESS_SACK
:
1297 /* Process an inbound SACK. */
1298 error
= sctp_cmd_process_sack(commands
, asoc
,
1302 case SCTP_CMD_GEN_INIT_ACK
:
1303 /* Generate an INIT ACK chunk. */
1304 new_obj
= sctp_make_init_ack(asoc
, chunk
, GFP_ATOMIC
,
1309 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1310 SCTP_CHUNK(new_obj
));
1313 case SCTP_CMD_PEER_INIT
:
1314 /* Process a unified INIT from the peer.
1315 * Note: Only used during INIT-ACK processing. If
1316 * there is an error just return to the outter
1317 * layer which will bail.
1319 error
= sctp_cmd_process_init(commands
, asoc
, chunk
,
1323 case SCTP_CMD_GEN_COOKIE_ECHO
:
1324 /* Generate a COOKIE ECHO chunk. */
1325 new_obj
= sctp_make_cookie_echo(asoc
, chunk
);
1328 sctp_chunk_free(cmd
->obj
.ptr
);
1331 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1332 SCTP_CHUNK(new_obj
));
1334 /* If there is an ERROR chunk to be sent along with
1335 * the COOKIE_ECHO, send it, too.
1338 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1339 SCTP_CHUNK(cmd
->obj
.ptr
));
1341 if (new_obj
->transport
) {
1342 new_obj
->transport
->init_sent_count
++;
1343 asoc
->init_last_sent_to
= new_obj
->transport
;
1346 /* FIXME - Eventually come up with a cleaner way to
1347 * enabling COOKIE-ECHO + DATA bundling during
1348 * multihoming stale cookie scenarios, the following
1349 * command plays with asoc->peer.retran_path to
1350 * avoid the problem of sending the COOKIE-ECHO and
1351 * DATA in different paths, which could result
1352 * in the association being ABORTed if the DATA chunk
1353 * is processed first by the server. Checking the
1354 * init error counter simply causes this command
1355 * to be executed only during failed attempts of
1356 * association establishment.
1358 if ((asoc
->peer
.retran_path
!=
1359 asoc
->peer
.primary_path
) &&
1360 (asoc
->init_err_counter
> 0)) {
1361 sctp_add_cmd_sf(commands
,
1362 SCTP_CMD_FORCE_PRIM_RETRAN
,
1368 case SCTP_CMD_GEN_SHUTDOWN
:
1369 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1370 * Reset error counts.
1372 asoc
->overall_error_count
= 0;
1374 /* Generate a SHUTDOWN chunk. */
1375 new_obj
= sctp_make_shutdown(asoc
, chunk
);
1378 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1379 SCTP_CHUNK(new_obj
));
1382 case SCTP_CMD_CHUNK_ULP
:
1383 /* Send a chunk to the sockets layer. */
1384 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1385 "chunk_up:", cmd
->obj
.ptr
,
1386 "ulpq:", &asoc
->ulpq
);
1387 sctp_ulpq_tail_data(&asoc
->ulpq
, cmd
->obj
.ptr
,
1391 case SCTP_CMD_EVENT_ULP
:
1392 /* Send a notification to the sockets layer. */
1393 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1394 "event_up:",cmd
->obj
.ptr
,
1395 "ulpq:",&asoc
->ulpq
);
1396 sctp_ulpq_tail_event(&asoc
->ulpq
, cmd
->obj
.ptr
);
1399 case SCTP_CMD_REPLY
:
1400 /* If an caller has not already corked, do cork. */
1401 if (!asoc
->outqueue
.cork
) {
1402 sctp_outq_cork(&asoc
->outqueue
);
1405 /* Send a chunk to our peer. */
1406 error
= sctp_outq_tail(&asoc
->outqueue
, cmd
->obj
.ptr
);
1409 case SCTP_CMD_SEND_PKT
:
1410 /* Send a full packet to our peer. */
1411 packet
= cmd
->obj
.ptr
;
1412 sctp_packet_transmit(packet
);
1413 sctp_ootb_pkt_free(packet
);
1416 case SCTP_CMD_T1_RETRAN
:
1417 /* Mark a transport for retransmission. */
1418 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1422 case SCTP_CMD_RETRAN
:
1423 /* Mark a transport for retransmission. */
1424 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1428 case SCTP_CMD_TRANSMIT
:
1429 /* Kick start transmission. */
1430 error
= sctp_outq_uncork(&asoc
->outqueue
);
1434 case SCTP_CMD_ECN_CE
:
1435 /* Do delayed CE processing. */
1436 sctp_do_ecn_ce_work(asoc
, cmd
->obj
.u32
);
1439 case SCTP_CMD_ECN_ECNE
:
1440 /* Do delayed ECNE processing. */
1441 new_obj
= sctp_do_ecn_ecne_work(asoc
, cmd
->obj
.u32
,
1444 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1445 SCTP_CHUNK(new_obj
));
1448 case SCTP_CMD_ECN_CWR
:
1449 /* Do delayed CWR processing. */
1450 sctp_do_ecn_cwr_work(asoc
, cmd
->obj
.u32
);
1453 case SCTP_CMD_SETUP_T2
:
1454 sctp_cmd_setup_t2(commands
, asoc
, cmd
->obj
.ptr
);
1457 case SCTP_CMD_TIMER_START_ONCE
:
1458 timer
= &asoc
->timers
[cmd
->obj
.to
];
1460 if (timer_pending(timer
))
1464 case SCTP_CMD_TIMER_START
:
1465 timer
= &asoc
->timers
[cmd
->obj
.to
];
1466 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1469 timer
->expires
= jiffies
+ timeout
;
1470 sctp_association_hold(asoc
);
1474 case SCTP_CMD_TIMER_RESTART
:
1475 timer
= &asoc
->timers
[cmd
->obj
.to
];
1476 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1477 if (!mod_timer(timer
, jiffies
+ timeout
))
1478 sctp_association_hold(asoc
);
1481 case SCTP_CMD_TIMER_STOP
:
1482 timer
= &asoc
->timers
[cmd
->obj
.to
];
1483 if (timer_pending(timer
) && del_timer(timer
))
1484 sctp_association_put(asoc
);
1487 case SCTP_CMD_INIT_CHOOSE_TRANSPORT
:
1488 chunk
= cmd
->obj
.ptr
;
1489 t
= sctp_assoc_choose_alter_transport(asoc
,
1490 asoc
->init_last_sent_to
);
1491 asoc
->init_last_sent_to
= t
;
1492 chunk
->transport
= t
;
1493 t
->init_sent_count
++;
1494 /* Set the new transport as primary */
1495 sctp_assoc_set_primary(asoc
, t
);
1498 case SCTP_CMD_INIT_RESTART
:
1499 /* Do the needed accounting and updates
1500 * associated with restarting an initialization
1501 * timer. Only multiply the timeout by two if
1502 * all transports have been tried at the current
1505 sctp_cmd_t1_timer_update(asoc
,
1506 SCTP_EVENT_TIMEOUT_T1_INIT
,
1509 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
1510 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT
));
1513 case SCTP_CMD_COOKIEECHO_RESTART
:
1514 /* Do the needed accounting and updates
1515 * associated with restarting an initialization
1516 * timer. Only multiply the timeout by two if
1517 * all transports have been tried at the current
1520 sctp_cmd_t1_timer_update(asoc
,
1521 SCTP_EVENT_TIMEOUT_T1_COOKIE
,
1524 /* If we've sent any data bundled with
1525 * COOKIE-ECHO we need to resend.
1527 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
1529 sctp_retransmit_mark(&asoc
->outqueue
, t
,
1533 sctp_add_cmd_sf(commands
,
1534 SCTP_CMD_TIMER_RESTART
,
1535 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE
));
1538 case SCTP_CMD_INIT_FAILED
:
1539 sctp_cmd_init_failed(commands
, asoc
, cmd
->obj
.err
);
1542 case SCTP_CMD_ASSOC_FAILED
:
1543 sctp_cmd_assoc_failed(commands
, asoc
, event_type
,
1544 subtype
, chunk
, cmd
->obj
.err
);
1547 case SCTP_CMD_INIT_COUNTER_INC
:
1548 asoc
->init_err_counter
++;
1551 case SCTP_CMD_INIT_COUNTER_RESET
:
1552 asoc
->init_err_counter
= 0;
1553 asoc
->init_cycle
= 0;
1554 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
1556 t
->init_sent_count
= 0;
1560 case SCTP_CMD_REPORT_DUP
:
1561 sctp_tsnmap_mark_dup(&asoc
->peer
.tsn_map
,
1565 case SCTP_CMD_REPORT_BAD_TAG
:
1566 SCTP_DEBUG_PRINTK("vtag mismatch!\n");
1569 case SCTP_CMD_STRIKE
:
1570 /* Mark one strike against a transport. */
1571 sctp_do_8_2_transport_strike(asoc
, cmd
->obj
.transport
,
1575 case SCTP_CMD_TRANSPORT_IDLE
:
1576 t
= cmd
->obj
.transport
;
1577 sctp_transport_lower_cwnd(t
, SCTP_LOWER_CWND_INACTIVE
);
1580 case SCTP_CMD_TRANSPORT_HB_SENT
:
1581 t
= cmd
->obj
.transport
;
1582 sctp_do_8_2_transport_strike(asoc
, t
, 1);
1586 case SCTP_CMD_TRANSPORT_ON
:
1587 t
= cmd
->obj
.transport
;
1588 sctp_cmd_transport_on(commands
, asoc
, t
, chunk
);
1591 case SCTP_CMD_HB_TIMERS_START
:
1592 sctp_cmd_hb_timers_start(commands
, asoc
);
1595 case SCTP_CMD_HB_TIMER_UPDATE
:
1596 t
= cmd
->obj
.transport
;
1597 sctp_cmd_hb_timer_update(commands
, t
);
1600 case SCTP_CMD_HB_TIMERS_STOP
:
1601 sctp_cmd_hb_timers_stop(commands
, asoc
);
1604 case SCTP_CMD_REPORT_ERROR
:
1605 error
= cmd
->obj
.error
;
1608 case SCTP_CMD_PROCESS_CTSN
:
1609 /* Dummy up a SACK for processing. */
1610 sackh
.cum_tsn_ack
= cmd
->obj
.be32
;
1611 sackh
.a_rwnd
= asoc
->peer
.rwnd
+
1612 asoc
->outqueue
.outstanding_bytes
;
1613 sackh
.num_gap_ack_blocks
= 0;
1614 sackh
.num_dup_tsns
= 0;
1615 sctp_add_cmd_sf(commands
, SCTP_CMD_PROCESS_SACK
,
1616 SCTP_SACKH(&sackh
));
1619 case SCTP_CMD_DISCARD_PACKET
:
1620 /* We need to discard the whole packet.
1621 * Uncork the queue since there might be
1624 chunk
->pdiscard
= 1;
1626 sctp_outq_uncork(&asoc
->outqueue
);
1631 case SCTP_CMD_RTO_PENDING
:
1632 t
= cmd
->obj
.transport
;
1636 case SCTP_CMD_PART_DELIVER
:
1637 sctp_ulpq_partial_delivery(&asoc
->ulpq
, cmd
->obj
.ptr
,
1641 case SCTP_CMD_RENEGE
:
1642 sctp_ulpq_renege(&asoc
->ulpq
, cmd
->obj
.ptr
,
1646 case SCTP_CMD_SETUP_T4
:
1647 sctp_cmd_setup_t4(commands
, asoc
, cmd
->obj
.ptr
);
1650 case SCTP_CMD_PROCESS_OPERR
:
1651 sctp_cmd_process_operr(commands
, asoc
, chunk
);
1653 case SCTP_CMD_CLEAR_INIT_TAG
:
1654 asoc
->peer
.i
.init_tag
= 0;
1656 case SCTP_CMD_DEL_NON_PRIMARY
:
1657 sctp_cmd_del_non_primary(asoc
);
1659 case SCTP_CMD_T3_RTX_TIMERS_STOP
:
1660 sctp_cmd_t3_rtx_timers_stop(commands
, asoc
);
1662 case SCTP_CMD_FORCE_PRIM_RETRAN
:
1663 t
= asoc
->peer
.retran_path
;
1664 asoc
->peer
.retran_path
= asoc
->peer
.primary_path
;
1665 error
= sctp_outq_uncork(&asoc
->outqueue
);
1667 asoc
->peer
.retran_path
= t
;
1669 case SCTP_CMD_SET_SK_ERR
:
1670 sctp_cmd_set_sk_err(asoc
, cmd
->obj
.error
);
1672 case SCTP_CMD_ASSOC_CHANGE
:
1673 sctp_cmd_assoc_change(commands
, asoc
,
1676 case SCTP_CMD_ADAPTATION_IND
:
1677 sctp_cmd_adaptation_ind(commands
, asoc
);
1680 case SCTP_CMD_ASSOC_SHKEY
:
1681 error
= sctp_auth_asoc_init_active_key(asoc
,
1684 case SCTP_CMD_UPDATE_INITTAG
:
1685 asoc
->peer
.i
.init_tag
= cmd
->obj
.u32
;
1687 case SCTP_CMD_SEND_MSG
:
1688 if (!asoc
->outqueue
.cork
) {
1689 sctp_outq_cork(&asoc
->outqueue
);
1692 error
= sctp_cmd_send_msg(asoc
, cmd
->obj
.msg
);
1694 case SCTP_CMD_SEND_NEXT_ASCONF
:
1695 sctp_cmd_send_asconf(asoc
);
1698 printk(KERN_WARNING
"Impossible command: %u, %p\n",
1699 cmd
->verb
, cmd
->obj
.ptr
);
1708 /* If this is in response to a received chunk, wait until
1709 * we are done with the packet to open the queue so that we don't
1710 * send multiple packets in response to a single request.
1712 if (asoc
&& SCTP_EVENT_T_CHUNK
== event_type
&& chunk
) {
1713 if (chunk
->end_of_packet
|| chunk
->singleton
)
1714 error
= sctp_outq_uncork(&asoc
->outqueue
);
1715 } else if (local_cork
)
1716 error
= sctp_outq_uncork(&asoc
->outqueue
);