1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
6 * This file is part of the SCTP kernel implementation
8 * These functions work with the state functions in sctp_sm_statefuns.c
9 * to implement that state operations. These functions implement the
10 * steps which require modifying existing data structures.
12 * This SCTP implementation is free software;
13 * you can redistribute it and/or modify it under the terms of
14 * the GNU General Public License as published by
15 * the Free Software Foundation; either version 2, or (at your option)
18 * This SCTP implementation is distributed in the hope that it
19 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
20 * ************************
21 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
22 * See the GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with GNU CC; see the file COPYING. If not, write to
26 * the Free Software Foundation, 59 Temple Place - Suite 330,
27 * Boston, MA 02111-1307, USA.
29 * Please send any bug reports or fixes you make to the
31 * lksctp developers <lksctp-developers@lists.sourceforge.net>
33 * Or submit a bug report through the following website:
34 * http://www.sf.net/projects/lksctp
36 * Written or modified by:
37 * La Monte H.P. Yarroll <piggy@acm.org>
38 * Karl Knutson <karl@athena.chicago.il.us>
39 * Jon Grimm <jgrimm@austin.ibm.com>
40 * Hui Huang <hui.huang@nokia.com>
41 * Dajiang Zhang <dajiang.zhang@nokia.com>
42 * Daisy Chang <daisyc@us.ibm.com>
43 * Sridhar Samudrala <sri@us.ibm.com>
44 * Ardelle Fan <ardelle.fan@intel.com>
46 * Any bugs reported given to us we will try to fix... any fixes shared will
47 * be incorporated into the next SCTP release.
50 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
52 #include <linux/skbuff.h>
53 #include <linux/types.h>
54 #include <linux/socket.h>
56 #include <linux/gfp.h>
58 #include <net/sctp/sctp.h>
59 #include <net/sctp/sm.h>
61 static int sctp_cmd_interpreter(sctp_event_t event_type
,
62 sctp_subtype_t subtype
,
64 struct sctp_endpoint
*ep
,
65 struct sctp_association
*asoc
,
67 sctp_disposition_t status
,
68 sctp_cmd_seq_t
*commands
,
70 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
72 struct sctp_endpoint
*ep
,
73 struct sctp_association
*asoc
,
75 sctp_disposition_t status
,
76 sctp_cmd_seq_t
*commands
,
79 /********************************************************************
81 ********************************************************************/
83 /* A helper function for delayed processing of INET ECN CE bit. */
84 static void sctp_do_ecn_ce_work(struct sctp_association
*asoc
,
87 /* Save the TSN away for comparison when we receive CWR */
89 asoc
->last_ecne_tsn
= lowest_tsn
;
93 /* Helper function for delayed processing of SCTP ECNE chunk. */
94 /* RFC 2960 Appendix A
96 * RFC 2481 details a specific bit for a sender to send in
97 * the header of its next outbound TCP segment to indicate to
98 * its peer that it has reduced its congestion window. This
99 * is termed the CWR bit. For SCTP the same indication is made
100 * by including the CWR chunk. This chunk contains one data
101 * element, i.e. the TSN number that was sent in the ECNE chunk.
102 * This element represents the lowest TSN number in the datagram
103 * that was originally marked with the CE bit.
105 static struct sctp_chunk
*sctp_do_ecn_ecne_work(struct sctp_association
*asoc
,
107 struct sctp_chunk
*chunk
)
109 struct sctp_chunk
*repl
;
111 /* Our previously transmitted packet ran into some congestion
112 * so we should take action by reducing cwnd and ssthresh
113 * and then ACK our peer that we we've done so by
117 /* First, try to determine if we want to actually lower
118 * our cwnd variables. Only lower them if the ECNE looks more
119 * recent than the last response.
121 if (TSN_lt(asoc
->last_cwr_tsn
, lowest_tsn
)) {
122 struct sctp_transport
*transport
;
124 /* Find which transport's congestion variables
125 * need to be adjusted.
127 transport
= sctp_assoc_lookup_tsn(asoc
, lowest_tsn
);
129 /* Update the congestion variables. */
131 sctp_transport_lower_cwnd(transport
,
132 SCTP_LOWER_CWND_ECNE
);
133 asoc
->last_cwr_tsn
= lowest_tsn
;
136 /* Always try to quiet the other end. In case of lost CWR,
137 * resend last_cwr_tsn.
139 repl
= sctp_make_cwr(asoc
, asoc
->last_cwr_tsn
, chunk
);
141 /* If we run out of memory, it will look like a lost CWR. We'll
142 * get back in sync eventually.
147 /* Helper function to do delayed processing of ECN CWR chunk. */
148 static void sctp_do_ecn_cwr_work(struct sctp_association
*asoc
,
151 /* Turn off ECNE getting auto-prepended to every outgoing
157 /* Generate SACK if necessary. We call this at the end of a packet. */
158 static int sctp_gen_sack(struct sctp_association
*asoc
, int force
,
159 sctp_cmd_seq_t
*commands
)
161 __u32 ctsn
, max_tsn_seen
;
162 struct sctp_chunk
*sack
;
163 struct sctp_transport
*trans
= asoc
->peer
.last_data_from
;
167 (!trans
&& (asoc
->param_flags
& SPP_SACKDELAY_DISABLE
)) ||
168 (trans
&& (trans
->param_flags
& SPP_SACKDELAY_DISABLE
)))
169 asoc
->peer
.sack_needed
= 1;
171 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
172 max_tsn_seen
= sctp_tsnmap_get_max_tsn_seen(&asoc
->peer
.tsn_map
);
174 /* From 12.2 Parameters necessary per association (i.e. the TCB):
176 * Ack State : This flag indicates if the next received packet
177 * : is to be responded to with a SACK. ...
178 * : When DATA chunks are out of order, SACK's
179 * : are not delayed (see Section 6).
181 * [This is actually not mentioned in Section 6, but we
182 * implement it here anyway. --piggy]
184 if (max_tsn_seen
!= ctsn
)
185 asoc
->peer
.sack_needed
= 1;
187 /* From 6.2 Acknowledgement on Reception of DATA Chunks:
189 * Section 4.2 of [RFC2581] SHOULD be followed. Specifically,
190 * an acknowledgement SHOULD be generated for at least every
191 * second packet (not every second DATA chunk) received, and
192 * SHOULD be generated within 200 ms of the arrival of any
193 * unacknowledged DATA chunk. ...
195 if (!asoc
->peer
.sack_needed
) {
196 asoc
->peer
.sack_cnt
++;
198 /* Set the SACK delay timeout based on the
199 * SACK delay for the last transport
200 * data was received from, or the default
201 * for the association.
204 /* We will need a SACK for the next packet. */
205 if (asoc
->peer
.sack_cnt
>= trans
->sackfreq
- 1)
206 asoc
->peer
.sack_needed
= 1;
208 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
211 /* We will need a SACK for the next packet. */
212 if (asoc
->peer
.sack_cnt
>= asoc
->sackfreq
- 1)
213 asoc
->peer
.sack_needed
= 1;
215 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
219 /* Restart the SACK timer. */
220 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
221 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
223 asoc
->a_rwnd
= asoc
->rwnd
;
224 sack
= sctp_make_sack(asoc
);
228 asoc
->peer
.sack_needed
= 0;
229 asoc
->peer
.sack_cnt
= 0;
231 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
, SCTP_CHUNK(sack
));
233 /* Stop the SACK timer. */
234 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_STOP
,
235 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
244 /* When the T3-RTX timer expires, it calls this function to create the
245 * relevant state machine event.
247 void sctp_generate_t3_rtx_event(unsigned long peer
)
250 struct sctp_transport
*transport
= (struct sctp_transport
*) peer
;
251 struct sctp_association
*asoc
= transport
->asoc
;
253 /* Check whether a task is in the sock. */
255 sctp_bh_lock_sock(asoc
->base
.sk
);
256 if (sock_owned_by_user(asoc
->base
.sk
)) {
257 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__
);
259 /* Try again later. */
260 if (!mod_timer(&transport
->T3_rtx_timer
, jiffies
+ (HZ
/20)))
261 sctp_transport_hold(transport
);
265 /* Is this transport really dead and just waiting around for
266 * the timer to let go of the reference?
271 /* Run through the state machine. */
272 error
= sctp_do_sm(SCTP_EVENT_T_TIMEOUT
,
273 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX
),
276 transport
, GFP_ATOMIC
);
279 asoc
->base
.sk
->sk_err
= -error
;
282 sctp_bh_unlock_sock(asoc
->base
.sk
);
283 sctp_transport_put(transport
);
286 /* This is a sa interface for producing timeout events. It works
287 * for timeouts which use the association as their parameter.
289 static void sctp_generate_timeout_event(struct sctp_association
*asoc
,
290 sctp_event_timeout_t timeout_type
)
294 sctp_bh_lock_sock(asoc
->base
.sk
);
295 if (sock_owned_by_user(asoc
->base
.sk
)) {
296 SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n",
300 /* Try again later. */
301 if (!mod_timer(&asoc
->timers
[timeout_type
], jiffies
+ (HZ
/20)))
302 sctp_association_hold(asoc
);
306 /* Is this association really dead and just waiting around for
307 * the timer to let go of the reference?
312 /* Run through the state machine. */
313 error
= sctp_do_sm(SCTP_EVENT_T_TIMEOUT
,
314 SCTP_ST_TIMEOUT(timeout_type
),
315 asoc
->state
, asoc
->ep
, asoc
,
316 (void *)timeout_type
, GFP_ATOMIC
);
319 asoc
->base
.sk
->sk_err
= -error
;
322 sctp_bh_unlock_sock(asoc
->base
.sk
);
323 sctp_association_put(asoc
);
326 static void sctp_generate_t1_cookie_event(unsigned long data
)
328 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
329 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_COOKIE
);
332 static void sctp_generate_t1_init_event(unsigned long data
)
334 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
335 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_INIT
);
338 static void sctp_generate_t2_shutdown_event(unsigned long data
)
340 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
341 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
);
344 static void sctp_generate_t4_rto_event(unsigned long data
)
346 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
347 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T4_RTO
);
350 static void sctp_generate_t5_shutdown_guard_event(unsigned long data
)
352 struct sctp_association
*asoc
= (struct sctp_association
*)data
;
353 sctp_generate_timeout_event(asoc
,
354 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD
);
356 } /* sctp_generate_t5_shutdown_guard_event() */
358 static void sctp_generate_autoclose_event(unsigned long data
)
360 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
361 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_AUTOCLOSE
);
364 /* Generate a heart beat event. If the sock is busy, reschedule. Make
365 * sure that the transport is still valid.
367 void sctp_generate_heartbeat_event(unsigned long data
)
370 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
371 struct sctp_association
*asoc
= transport
->asoc
;
373 sctp_bh_lock_sock(asoc
->base
.sk
);
374 if (sock_owned_by_user(asoc
->base
.sk
)) {
375 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__
);
377 /* Try again later. */
378 if (!mod_timer(&transport
->hb_timer
, jiffies
+ (HZ
/20)))
379 sctp_transport_hold(transport
);
383 /* Is this structure just waiting around for us to actually
389 error
= sctp_do_sm(SCTP_EVENT_T_TIMEOUT
,
390 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT
),
391 asoc
->state
, asoc
->ep
, asoc
,
392 transport
, GFP_ATOMIC
);
395 asoc
->base
.sk
->sk_err
= -error
;
398 sctp_bh_unlock_sock(asoc
->base
.sk
);
399 sctp_transport_put(transport
);
402 /* Handle the timeout of the ICMP protocol unreachable timer. Trigger
403 * the correct state machine transition that will close the association.
405 void sctp_generate_proto_unreach_event(unsigned long data
)
407 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
408 struct sctp_association
*asoc
= transport
->asoc
;
410 sctp_bh_lock_sock(asoc
->base
.sk
);
411 if (sock_owned_by_user(asoc
->base
.sk
)) {
412 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__
);
414 /* Try again later. */
415 if (!mod_timer(&transport
->proto_unreach_timer
,
417 sctp_association_hold(asoc
);
421 /* Is this structure just waiting around for us to actually
427 sctp_do_sm(SCTP_EVENT_T_OTHER
,
428 SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH
),
429 asoc
->state
, asoc
->ep
, asoc
, transport
, GFP_ATOMIC
);
432 sctp_bh_unlock_sock(asoc
->base
.sk
);
433 sctp_association_put(asoc
);
437 /* Inject a SACK Timeout event into the state machine. */
438 static void sctp_generate_sack_event(unsigned long data
)
440 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
441 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_SACK
);
444 sctp_timer_event_t
*sctp_timer_events
[SCTP_NUM_TIMEOUT_TYPES
] = {
446 sctp_generate_t1_cookie_event
,
447 sctp_generate_t1_init_event
,
448 sctp_generate_t2_shutdown_event
,
450 sctp_generate_t4_rto_event
,
451 sctp_generate_t5_shutdown_guard_event
,
453 sctp_generate_sack_event
,
454 sctp_generate_autoclose_event
,
458 /* RFC 2960 8.2 Path Failure Detection
460 * When its peer endpoint is multi-homed, an endpoint should keep a
461 * error counter for each of the destination transport addresses of the
464 * Each time the T3-rtx timer expires on any address, or when a
465 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
466 * the error counter of that destination address will be incremented.
467 * When the value in the error counter exceeds the protocol parameter
468 * 'Path.Max.Retrans' of that destination address, the endpoint should
469 * mark the destination transport address as inactive, and a
470 * notification SHOULD be sent to the upper layer.
473 static void sctp_do_8_2_transport_strike(struct sctp_association
*asoc
,
474 struct sctp_transport
*transport
,
477 /* The check for association's overall error counter exceeding the
478 * threshold is done in the state function.
480 /* We are here due to a timer expiration. If the timer was
481 * not a HEARTBEAT, then normal error tracking is done.
482 * If the timer was a heartbeat, we only increment error counts
483 * when we already have an outstanding HEARTBEAT that has not
485 * Additionally, some tranport states inhibit error increments.
488 asoc
->overall_error_count
++;
489 if (transport
->state
!= SCTP_INACTIVE
)
490 transport
->error_count
++;
491 } else if (transport
->hb_sent
) {
492 if (transport
->state
!= SCTP_UNCONFIRMED
)
493 asoc
->overall_error_count
++;
494 if (transport
->state
!= SCTP_INACTIVE
)
495 transport
->error_count
++;
498 if (transport
->state
!= SCTP_INACTIVE
&&
499 (transport
->error_count
> transport
->pathmaxrxt
)) {
500 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
501 " transport IP: port:%d failed.\n",
503 (&transport
->ipaddr
),
504 ntohs(transport
->ipaddr
.v4
.sin_port
));
505 sctp_assoc_control_transport(asoc
, transport
,
507 SCTP_FAILED_THRESHOLD
);
510 /* E2) For the destination address for which the timer
511 * expires, set RTO <- RTO * 2 ("back off the timer"). The
512 * maximum value discussed in rule C7 above (RTO.max) may be
513 * used to provide an upper bound to this doubling operation.
515 * Special Case: the first HB doesn't trigger exponential backoff.
516 * The first unacknowledged HB triggers it. We do this with a flag
517 * that indicates that we have an outstanding HB.
519 if (!is_hb
|| transport
->hb_sent
) {
520 transport
->rto
= min((transport
->rto
* 2), transport
->asoc
->rto_max
);
524 /* Worker routine to handle INIT command failure. */
525 static void sctp_cmd_init_failed(sctp_cmd_seq_t
*commands
,
526 struct sctp_association
*asoc
,
529 struct sctp_ulpevent
*event
;
531 event
= sctp_ulpevent_make_assoc_change(asoc
,0, SCTP_CANT_STR_ASSOC
,
532 (__u16
)error
, 0, 0, NULL
,
536 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
537 SCTP_ULPEVENT(event
));
539 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
540 SCTP_STATE(SCTP_STATE_CLOSED
));
542 /* SEND_FAILED sent later when cleaning up the association. */
543 asoc
->outqueue
.error
= error
;
544 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
547 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
548 static void sctp_cmd_assoc_failed(sctp_cmd_seq_t
*commands
,
549 struct sctp_association
*asoc
,
550 sctp_event_t event_type
,
551 sctp_subtype_t subtype
,
552 struct sctp_chunk
*chunk
,
555 struct sctp_ulpevent
*event
;
557 /* Cancel any partial delivery in progress. */
558 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
560 if (event_type
== SCTP_EVENT_T_CHUNK
&& subtype
.chunk
== SCTP_CID_ABORT
)
561 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
562 (__u16
)error
, 0, 0, chunk
,
565 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
566 (__u16
)error
, 0, 0, NULL
,
569 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
570 SCTP_ULPEVENT(event
));
572 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
573 SCTP_STATE(SCTP_STATE_CLOSED
));
575 /* SEND_FAILED sent later when cleaning up the association. */
576 asoc
->outqueue
.error
= error
;
577 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
580 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
581 * inside the cookie. In reality, this is only used for INIT-ACK processing
582 * since all other cases use "temporary" associations and can do all
583 * their work in statefuns directly.
585 static int sctp_cmd_process_init(sctp_cmd_seq_t
*commands
,
586 struct sctp_association
*asoc
,
587 struct sctp_chunk
*chunk
,
588 sctp_init_chunk_t
*peer_init
,
593 /* We only process the init as a sideeffect in a single
594 * case. This is when we process the INIT-ACK. If we
595 * fail during INIT processing (due to malloc problems),
596 * just return the error and stop processing the stack.
598 if (!sctp_process_init(asoc
, chunk
, sctp_source(chunk
), peer_init
, gfp
))
606 /* Helper function to break out starting up of heartbeat timers. */
607 static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t
*cmds
,
608 struct sctp_association
*asoc
)
610 struct sctp_transport
*t
;
612 /* Start a heartbeat timer for each transport on the association.
613 * hold a reference on the transport to make sure none of
614 * the needed data structures go away.
616 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
, transports
) {
618 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
619 sctp_transport_hold(t
);
623 static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t
*cmds
,
624 struct sctp_association
*asoc
)
626 struct sctp_transport
*t
;
628 /* Stop all heartbeat timers. */
630 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
632 if (del_timer(&t
->hb_timer
))
633 sctp_transport_put(t
);
637 /* Helper function to stop any pending T3-RTX timers */
638 static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t
*cmds
,
639 struct sctp_association
*asoc
)
641 struct sctp_transport
*t
;
643 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
645 if (timer_pending(&t
->T3_rtx_timer
) &&
646 del_timer(&t
->T3_rtx_timer
)) {
647 sctp_transport_put(t
);
653 /* Helper function to update the heartbeat timer. */
654 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t
*cmds
,
655 struct sctp_transport
*t
)
657 /* Update the heartbeat timer. */
658 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
659 sctp_transport_hold(t
);
662 /* Helper function to handle the reception of an HEARTBEAT ACK. */
663 static void sctp_cmd_transport_on(sctp_cmd_seq_t
*cmds
,
664 struct sctp_association
*asoc
,
665 struct sctp_transport
*t
,
666 struct sctp_chunk
*chunk
)
668 sctp_sender_hb_info_t
*hbinfo
;
669 int was_unconfirmed
= 0;
671 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
672 * HEARTBEAT should clear the error counter of the destination
673 * transport address to which the HEARTBEAT was sent.
678 * Although RFC4960 specifies that the overall error count must
679 * be cleared when a HEARTBEAT ACK is received, we make an
680 * exception while in SHUTDOWN PENDING. If the peer keeps its
681 * window shut forever, we may never be able to transmit our
682 * outstanding data and rely on the retransmission limit be reached
683 * to shutdown the association.
685 if (t
->asoc
->state
!= SCTP_STATE_SHUTDOWN_PENDING
)
686 t
->asoc
->overall_error_count
= 0;
688 /* Clear the hb_sent flag to signal that we had a good
693 /* Mark the destination transport address as active if it is not so
696 if ((t
->state
== SCTP_INACTIVE
) || (t
->state
== SCTP_UNCONFIRMED
)) {
698 sctp_assoc_control_transport(asoc
, t
, SCTP_TRANSPORT_UP
,
699 SCTP_HEARTBEAT_SUCCESS
);
702 /* The receiver of the HEARTBEAT ACK should also perform an
703 * RTT measurement for that destination transport address
704 * using the time value carried in the HEARTBEAT ACK chunk.
705 * If the transport's rto_pending variable has been cleared,
706 * it was most likely due to a retransmit. However, we want
707 * to re-enable it to properly update the rto.
709 if (t
->rto_pending
== 0)
712 hbinfo
= (sctp_sender_hb_info_t
*) chunk
->skb
->data
;
713 sctp_transport_update_rto(t
, (jiffies
- hbinfo
->sent_at
));
715 /* Update the heartbeat timer. */
716 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
717 sctp_transport_hold(t
);
719 if (was_unconfirmed
&& asoc
->peer
.transport_count
== 1)
720 sctp_transport_immediate_rtx(t
);
724 /* Helper function to process the process SACK command. */
725 static int sctp_cmd_process_sack(sctp_cmd_seq_t
*cmds
,
726 struct sctp_association
*asoc
,
727 struct sctp_sackhdr
*sackh
)
731 if (sctp_outq_sack(&asoc
->outqueue
, sackh
)) {
732 /* There are no more TSNs awaiting SACK. */
733 err
= sctp_do_sm(SCTP_EVENT_T_OTHER
,
734 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN
),
735 asoc
->state
, asoc
->ep
, asoc
, NULL
,
742 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
743 * the transport for a shutdown chunk.
745 static void sctp_cmd_setup_t2(sctp_cmd_seq_t
*cmds
,
746 struct sctp_association
*asoc
,
747 struct sctp_chunk
*chunk
)
749 struct sctp_transport
*t
;
751 if (chunk
->transport
)
752 t
= chunk
->transport
;
754 t
= sctp_assoc_choose_alter_transport(asoc
,
755 asoc
->shutdown_last_sent_to
);
756 chunk
->transport
= t
;
758 asoc
->shutdown_last_sent_to
= t
;
759 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
] = t
->rto
;
762 /* Helper function to change the state of an association. */
763 static void sctp_cmd_new_state(sctp_cmd_seq_t
*cmds
,
764 struct sctp_association
*asoc
,
767 struct sock
*sk
= asoc
->base
.sk
;
771 SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n",
772 asoc
, sctp_state_tbl
[state
]);
774 if (sctp_style(sk
, TCP
)) {
775 /* Change the sk->sk_state of a TCP-style socket that has
776 * successfully completed a connect() call.
778 if (sctp_state(asoc
, ESTABLISHED
) && sctp_sstate(sk
, CLOSED
))
779 sk
->sk_state
= SCTP_SS_ESTABLISHED
;
781 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
782 if (sctp_state(asoc
, SHUTDOWN_RECEIVED
) &&
783 sctp_sstate(sk
, ESTABLISHED
))
784 sk
->sk_shutdown
|= RCV_SHUTDOWN
;
787 if (sctp_state(asoc
, COOKIE_WAIT
)) {
788 /* Reset init timeouts since they may have been
789 * increased due to timer expirations.
791 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] =
793 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] =
797 if (sctp_state(asoc
, ESTABLISHED
) ||
798 sctp_state(asoc
, CLOSED
) ||
799 sctp_state(asoc
, SHUTDOWN_RECEIVED
)) {
800 /* Wake up any processes waiting in the asoc's wait queue in
801 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
803 if (waitqueue_active(&asoc
->wait
))
804 wake_up_interruptible(&asoc
->wait
);
806 /* Wake up any processes waiting in the sk's sleep queue of
807 * a TCP-style or UDP-style peeled-off socket in
808 * sctp_wait_for_accept() or sctp_wait_for_packet().
809 * For a UDP-style socket, the waiters are woken up by the
812 if (!sctp_style(sk
, UDP
))
813 sk
->sk_state_change(sk
);
817 /* Helper function to delete an association. */
818 static void sctp_cmd_delete_tcb(sctp_cmd_seq_t
*cmds
,
819 struct sctp_association
*asoc
)
821 struct sock
*sk
= asoc
->base
.sk
;
823 /* If it is a non-temporary association belonging to a TCP-style
824 * listening socket that is not closed, do not free it so that accept()
825 * can pick it up later.
827 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
) &&
828 (!asoc
->temp
) && (sk
->sk_shutdown
!= SHUTDOWN_MASK
))
831 sctp_unhash_established(asoc
);
832 sctp_association_free(asoc
);
836 * ADDIP Section 4.1 ASCONF Chunk Procedures
837 * A4) Start a T-4 RTO timer, using the RTO value of the selected
838 * destination address (we use active path instead of primary path just
839 * because primary path may be inactive.
841 static void sctp_cmd_setup_t4(sctp_cmd_seq_t
*cmds
,
842 struct sctp_association
*asoc
,
843 struct sctp_chunk
*chunk
)
845 struct sctp_transport
*t
;
847 t
= sctp_assoc_choose_alter_transport(asoc
, chunk
->transport
);
848 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T4_RTO
] = t
->rto
;
849 chunk
->transport
= t
;
852 /* Process an incoming Operation Error Chunk. */
853 static void sctp_cmd_process_operr(sctp_cmd_seq_t
*cmds
,
854 struct sctp_association
*asoc
,
855 struct sctp_chunk
*chunk
)
857 struct sctp_errhdr
*err_hdr
;
858 struct sctp_ulpevent
*ev
;
860 while (chunk
->chunk_end
> chunk
->skb
->data
) {
861 err_hdr
= (struct sctp_errhdr
*)(chunk
->skb
->data
);
863 ev
= sctp_ulpevent_make_remote_error(asoc
, chunk
, 0,
868 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
870 switch (err_hdr
->cause
) {
871 case SCTP_ERROR_UNKNOWN_CHUNK
:
873 sctp_chunkhdr_t
*unk_chunk_hdr
;
875 unk_chunk_hdr
= (sctp_chunkhdr_t
*)err_hdr
->variable
;
876 switch (unk_chunk_hdr
->type
) {
877 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with
878 * an ERROR chunk reporting that it did not recognized
879 * the ASCONF chunk type, the sender of the ASCONF MUST
880 * NOT send any further ASCONF chunks and MUST stop its
883 case SCTP_CID_ASCONF
:
884 if (asoc
->peer
.asconf_capable
== 0)
887 asoc
->peer
.asconf_capable
= 0;
888 sctp_add_cmd_sf(cmds
, SCTP_CMD_TIMER_STOP
,
889 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO
));
902 /* Process variable FWDTSN chunk information. */
903 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq
*ulpq
,
904 struct sctp_chunk
*chunk
)
906 struct sctp_fwdtsn_skip
*skip
;
907 /* Walk through all the skipped SSNs */
908 sctp_walk_fwdtsn(skip
, chunk
) {
909 sctp_ulpq_skip(ulpq
, ntohs(skip
->stream
), ntohs(skip
->ssn
));
913 /* Helper function to remove the association non-primary peer
916 static void sctp_cmd_del_non_primary(struct sctp_association
*asoc
)
918 struct sctp_transport
*t
;
919 struct list_head
*pos
;
920 struct list_head
*temp
;
922 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
923 t
= list_entry(pos
, struct sctp_transport
, transports
);
924 if (!sctp_cmp_addr_exact(&t
->ipaddr
,
925 &asoc
->peer
.primary_addr
)) {
926 sctp_assoc_del_peer(asoc
, &t
->ipaddr
);
931 /* Helper function to set sk_err on a 1-1 style socket. */
932 static void sctp_cmd_set_sk_err(struct sctp_association
*asoc
, int error
)
934 struct sock
*sk
= asoc
->base
.sk
;
936 if (!sctp_style(sk
, UDP
))
940 /* Helper function to generate an association change event */
941 static void sctp_cmd_assoc_change(sctp_cmd_seq_t
*commands
,
942 struct sctp_association
*asoc
,
945 struct sctp_ulpevent
*ev
;
947 ev
= sctp_ulpevent_make_assoc_change(asoc
, 0, state
, 0,
948 asoc
->c
.sinit_num_ostreams
,
949 asoc
->c
.sinit_max_instreams
,
952 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
955 /* Helper function to generate an adaptation indication event */
956 static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t
*commands
,
957 struct sctp_association
*asoc
)
959 struct sctp_ulpevent
*ev
;
961 ev
= sctp_ulpevent_make_adaptation_indication(asoc
, GFP_ATOMIC
);
964 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
968 static void sctp_cmd_t1_timer_update(struct sctp_association
*asoc
,
969 sctp_event_timeout_t timer
,
972 struct sctp_transport
*t
;
974 t
= asoc
->init_last_sent_to
;
975 asoc
->init_err_counter
++;
977 if (t
->init_sent_count
> (asoc
->init_cycle
+ 1)) {
978 asoc
->timeouts
[timer
] *= 2;
979 if (asoc
->timeouts
[timer
] > asoc
->max_init_timeo
) {
980 asoc
->timeouts
[timer
] = asoc
->max_init_timeo
;
984 "T1 %s Timeout adjustment"
985 " init_err_counter: %d"
989 asoc
->init_err_counter
,
991 asoc
->timeouts
[timer
]);
996 /* Send the whole message, chunk by chunk, to the outqueue.
997 * This way the whole message is queued up and bundling if
998 * encouraged for small fragments.
1000 static int sctp_cmd_send_msg(struct sctp_association
*asoc
,
1001 struct sctp_datamsg
*msg
)
1003 struct sctp_chunk
*chunk
;
1006 list_for_each_entry(chunk
, &msg
->chunks
, frag_list
) {
1007 error
= sctp_outq_tail(&asoc
->outqueue
, chunk
);
1016 /* Sent the next ASCONF packet currently stored in the association.
1017 * This happens after the ASCONF_ACK was succeffully processed.
1019 static void sctp_cmd_send_asconf(struct sctp_association
*asoc
)
1021 /* Send the next asconf chunk from the addip chunk
1024 if (!list_empty(&asoc
->addip_chunk_list
)) {
1025 struct list_head
*entry
= asoc
->addip_chunk_list
.next
;
1026 struct sctp_chunk
*asconf
= list_entry(entry
,
1027 struct sctp_chunk
, list
);
1028 list_del_init(entry
);
1030 /* Hold the chunk until an ASCONF_ACK is received. */
1031 sctp_chunk_hold(asconf
);
1032 if (sctp_primitive_ASCONF(asoc
, asconf
))
1033 sctp_chunk_free(asconf
);
1035 asoc
->addip_last_asconf
= asconf
;
1040 /* These three macros allow us to pull the debugging code out of the
1041 * main flow of sctp_do_sm() to keep attention focused on the real
1042 * functionality there.
1045 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
1046 "ep %p, %s, %s, asoc %p[%s], %s\n", \
1047 ep, sctp_evttype_tbl[event_type], \
1048 (*debug_fn)(subtype), asoc, \
1049 sctp_state_tbl[state], state_fn->name)
1051 #define DEBUG_POST \
1052 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
1053 "asoc %p, status: %s\n", \
1054 asoc, sctp_status_tbl[status])
1056 #define DEBUG_POST_SFX \
1057 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
1059 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
1060 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
1063 * This is the master state machine processing function.
1065 * If you want to understand all of lksctp, this is a
1066 * good place to start.
1068 int sctp_do_sm(sctp_event_t event_type
, sctp_subtype_t subtype
,
1070 struct sctp_endpoint
*ep
,
1071 struct sctp_association
*asoc
,
1075 sctp_cmd_seq_t commands
;
1076 const sctp_sm_table_entry_t
*state_fn
;
1077 sctp_disposition_t status
;
1079 typedef const char *(printfn_t
)(sctp_subtype_t
);
1081 static printfn_t
*table
[] = {
1082 NULL
, sctp_cname
, sctp_tname
, sctp_oname
, sctp_pname
,
1084 printfn_t
*debug_fn
__attribute__ ((unused
)) = table
[event_type
];
1086 /* Look up the state function, run it, and then process the
1087 * side effects. These three steps are the heart of lksctp.
1089 state_fn
= sctp_sm_lookup_event(event_type
, state
, subtype
);
1091 sctp_init_cmd_seq(&commands
);
1094 status
= (*state_fn
->fn
)(ep
, asoc
, subtype
, event_arg
, &commands
);
1097 error
= sctp_side_effects(event_type
, subtype
, state
,
1098 ep
, asoc
, event_arg
, status
,
1108 /*****************************************************************
1109 * This the master state function side effect processing function.
1110 *****************************************************************/
1111 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
1113 struct sctp_endpoint
*ep
,
1114 struct sctp_association
*asoc
,
1116 sctp_disposition_t status
,
1117 sctp_cmd_seq_t
*commands
,
1122 /* FIXME - Most of the dispositions left today would be categorized
1123 * as "exceptional" dispositions. For those dispositions, it
1124 * may not be proper to run through any of the commands at all.
1125 * For example, the command interpreter might be run only with
1126 * disposition SCTP_DISPOSITION_CONSUME.
1128 if (0 != (error
= sctp_cmd_interpreter(event_type
, subtype
, state
,
1135 case SCTP_DISPOSITION_DISCARD
:
1136 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
1137 "event_type %d, event_id %d\n",
1138 state
, event_type
, subtype
.chunk
);
1141 case SCTP_DISPOSITION_NOMEM
:
1142 /* We ran out of memory, so we need to discard this
1145 /* BUG--we should now recover some memory, probably by
1151 case SCTP_DISPOSITION_DELETE_TCB
:
1152 /* This should now be a command. */
1155 case SCTP_DISPOSITION_CONSUME
:
1156 case SCTP_DISPOSITION_ABORT
:
1158 * We should no longer have much work to do here as the
1159 * real work has been done as explicit commands above.
1163 case SCTP_DISPOSITION_VIOLATION
:
1164 net_err_ratelimited("protocol violation state %d chunkid %d\n",
1165 state
, subtype
.chunk
);
1168 case SCTP_DISPOSITION_NOT_IMPL
:
1169 pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n",
1170 state
, event_type
, subtype
.chunk
);
1173 case SCTP_DISPOSITION_BUG
:
1174 pr_err("bug in state %d, event_type %d, event_id %d\n",
1175 state
, event_type
, subtype
.chunk
);
1180 pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n",
1181 status
, state
, event_type
, subtype
.chunk
);
1190 /********************************************************************
1191 * 2nd Level Abstractions
1192 ********************************************************************/
1194 /* This is the side-effect interpreter. */
1195 static int sctp_cmd_interpreter(sctp_event_t event_type
,
1196 sctp_subtype_t subtype
,
1198 struct sctp_endpoint
*ep
,
1199 struct sctp_association
*asoc
,
1201 sctp_disposition_t status
,
1202 sctp_cmd_seq_t
*commands
,
1208 struct sctp_chunk
*new_obj
;
1209 struct sctp_chunk
*chunk
= NULL
;
1210 struct sctp_packet
*packet
;
1211 struct timer_list
*timer
;
1212 unsigned long timeout
;
1213 struct sctp_transport
*t
;
1214 struct sctp_sackhdr sackh
;
1217 if (SCTP_EVENT_T_TIMEOUT
!= event_type
)
1220 /* Note: This whole file is a huge candidate for rework.
1221 * For example, each command could either have its own handler, so
1222 * the loop would look like:
1224 * cmd->handle(x, y, z)
1227 while (NULL
!= (cmd
= sctp_next_cmd(commands
))) {
1228 switch (cmd
->verb
) {
1233 case SCTP_CMD_NEW_ASOC
:
1234 /* Register a new association. */
1236 sctp_outq_uncork(&asoc
->outqueue
);
1239 asoc
= cmd
->obj
.ptr
;
1240 /* Register with the endpoint. */
1241 sctp_endpoint_add_asoc(ep
, asoc
);
1242 sctp_hash_established(asoc
);
1245 case SCTP_CMD_UPDATE_ASSOC
:
1246 sctp_assoc_update(asoc
, cmd
->obj
.ptr
);
1249 case SCTP_CMD_PURGE_OUTQUEUE
:
1250 sctp_outq_teardown(&asoc
->outqueue
);
1253 case SCTP_CMD_DELETE_TCB
:
1255 sctp_outq_uncork(&asoc
->outqueue
);
1258 /* Delete the current association. */
1259 sctp_cmd_delete_tcb(commands
, asoc
);
1263 case SCTP_CMD_NEW_STATE
:
1264 /* Enter a new state. */
1265 sctp_cmd_new_state(commands
, asoc
, cmd
->obj
.state
);
1268 case SCTP_CMD_REPORT_TSN
:
1269 /* Record the arrival of a TSN. */
1270 error
= sctp_tsnmap_mark(&asoc
->peer
.tsn_map
,
1274 case SCTP_CMD_REPORT_FWDTSN
:
1275 /* Move the Cumulattive TSN Ack ahead. */
1276 sctp_tsnmap_skip(&asoc
->peer
.tsn_map
, cmd
->obj
.u32
);
1278 /* purge the fragmentation queue */
1279 sctp_ulpq_reasm_flushtsn(&asoc
->ulpq
, cmd
->obj
.u32
);
1281 /* Abort any in progress partial delivery. */
1282 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
1285 case SCTP_CMD_PROCESS_FWDTSN
:
1286 sctp_cmd_process_fwdtsn(&asoc
->ulpq
, cmd
->obj
.ptr
);
1289 case SCTP_CMD_GEN_SACK
:
1290 /* Generate a Selective ACK.
1291 * The argument tells us whether to just count
1292 * the packet and MAYBE generate a SACK, or
1295 force
= cmd
->obj
.i32
;
1296 error
= sctp_gen_sack(asoc
, force
, commands
);
1299 case SCTP_CMD_PROCESS_SACK
:
1300 /* Process an inbound SACK. */
1301 error
= sctp_cmd_process_sack(commands
, asoc
,
1305 case SCTP_CMD_GEN_INIT_ACK
:
1306 /* Generate an INIT ACK chunk. */
1307 new_obj
= sctp_make_init_ack(asoc
, chunk
, GFP_ATOMIC
,
1312 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1313 SCTP_CHUNK(new_obj
));
1316 case SCTP_CMD_PEER_INIT
:
1317 /* Process a unified INIT from the peer.
1318 * Note: Only used during INIT-ACK processing. If
1319 * there is an error just return to the outter
1320 * layer which will bail.
1322 error
= sctp_cmd_process_init(commands
, asoc
, chunk
,
1326 case SCTP_CMD_GEN_COOKIE_ECHO
:
1327 /* Generate a COOKIE ECHO chunk. */
1328 new_obj
= sctp_make_cookie_echo(asoc
, chunk
);
1331 sctp_chunk_free(cmd
->obj
.ptr
);
1334 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1335 SCTP_CHUNK(new_obj
));
1337 /* If there is an ERROR chunk to be sent along with
1338 * the COOKIE_ECHO, send it, too.
1341 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1342 SCTP_CHUNK(cmd
->obj
.ptr
));
1344 if (new_obj
->transport
) {
1345 new_obj
->transport
->init_sent_count
++;
1346 asoc
->init_last_sent_to
= new_obj
->transport
;
1349 /* FIXME - Eventually come up with a cleaner way to
1350 * enabling COOKIE-ECHO + DATA bundling during
1351 * multihoming stale cookie scenarios, the following
1352 * command plays with asoc->peer.retran_path to
1353 * avoid the problem of sending the COOKIE-ECHO and
1354 * DATA in different paths, which could result
1355 * in the association being ABORTed if the DATA chunk
1356 * is processed first by the server. Checking the
1357 * init error counter simply causes this command
1358 * to be executed only during failed attempts of
1359 * association establishment.
1361 if ((asoc
->peer
.retran_path
!=
1362 asoc
->peer
.primary_path
) &&
1363 (asoc
->init_err_counter
> 0)) {
1364 sctp_add_cmd_sf(commands
,
1365 SCTP_CMD_FORCE_PRIM_RETRAN
,
1371 case SCTP_CMD_GEN_SHUTDOWN
:
1372 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1373 * Reset error counts.
1375 asoc
->overall_error_count
= 0;
1377 /* Generate a SHUTDOWN chunk. */
1378 new_obj
= sctp_make_shutdown(asoc
, chunk
);
1381 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1382 SCTP_CHUNK(new_obj
));
1385 case SCTP_CMD_CHUNK_ULP
:
1386 /* Send a chunk to the sockets layer. */
1387 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1388 "chunk_up:", cmd
->obj
.ptr
,
1389 "ulpq:", &asoc
->ulpq
);
1390 sctp_ulpq_tail_data(&asoc
->ulpq
, cmd
->obj
.ptr
,
1394 case SCTP_CMD_EVENT_ULP
:
1395 /* Send a notification to the sockets layer. */
1396 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1397 "event_up:",cmd
->obj
.ptr
,
1398 "ulpq:",&asoc
->ulpq
);
1399 sctp_ulpq_tail_event(&asoc
->ulpq
, cmd
->obj
.ptr
);
1402 case SCTP_CMD_REPLY
:
1403 /* If an caller has not already corked, do cork. */
1404 if (!asoc
->outqueue
.cork
) {
1405 sctp_outq_cork(&asoc
->outqueue
);
1408 /* Send a chunk to our peer. */
1409 error
= sctp_outq_tail(&asoc
->outqueue
, cmd
->obj
.ptr
);
1412 case SCTP_CMD_SEND_PKT
:
1413 /* Send a full packet to our peer. */
1414 packet
= cmd
->obj
.ptr
;
1415 sctp_packet_transmit(packet
);
1416 sctp_ootb_pkt_free(packet
);
1419 case SCTP_CMD_T1_RETRAN
:
1420 /* Mark a transport for retransmission. */
1421 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1425 case SCTP_CMD_RETRAN
:
1426 /* Mark a transport for retransmission. */
1427 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1431 case SCTP_CMD_ECN_CE
:
1432 /* Do delayed CE processing. */
1433 sctp_do_ecn_ce_work(asoc
, cmd
->obj
.u32
);
1436 case SCTP_CMD_ECN_ECNE
:
1437 /* Do delayed ECNE processing. */
1438 new_obj
= sctp_do_ecn_ecne_work(asoc
, cmd
->obj
.u32
,
1441 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1442 SCTP_CHUNK(new_obj
));
1445 case SCTP_CMD_ECN_CWR
:
1446 /* Do delayed CWR processing. */
1447 sctp_do_ecn_cwr_work(asoc
, cmd
->obj
.u32
);
1450 case SCTP_CMD_SETUP_T2
:
1451 sctp_cmd_setup_t2(commands
, asoc
, cmd
->obj
.ptr
);
1454 case SCTP_CMD_TIMER_START_ONCE
:
1455 timer
= &asoc
->timers
[cmd
->obj
.to
];
1457 if (timer_pending(timer
))
1461 case SCTP_CMD_TIMER_START
:
1462 timer
= &asoc
->timers
[cmd
->obj
.to
];
1463 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1466 timer
->expires
= jiffies
+ timeout
;
1467 sctp_association_hold(asoc
);
1471 case SCTP_CMD_TIMER_RESTART
:
1472 timer
= &asoc
->timers
[cmd
->obj
.to
];
1473 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1474 if (!mod_timer(timer
, jiffies
+ timeout
))
1475 sctp_association_hold(asoc
);
1478 case SCTP_CMD_TIMER_STOP
:
1479 timer
= &asoc
->timers
[cmd
->obj
.to
];
1480 if (timer_pending(timer
) && del_timer(timer
))
1481 sctp_association_put(asoc
);
1484 case SCTP_CMD_INIT_CHOOSE_TRANSPORT
:
1485 chunk
= cmd
->obj
.ptr
;
1486 t
= sctp_assoc_choose_alter_transport(asoc
,
1487 asoc
->init_last_sent_to
);
1488 asoc
->init_last_sent_to
= t
;
1489 chunk
->transport
= t
;
1490 t
->init_sent_count
++;
1491 /* Set the new transport as primary */
1492 sctp_assoc_set_primary(asoc
, t
);
1495 case SCTP_CMD_INIT_RESTART
:
1496 /* Do the needed accounting and updates
1497 * associated with restarting an initialization
1498 * timer. Only multiply the timeout by two if
1499 * all transports have been tried at the current
1502 sctp_cmd_t1_timer_update(asoc
,
1503 SCTP_EVENT_TIMEOUT_T1_INIT
,
1506 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
1507 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT
));
1510 case SCTP_CMD_COOKIEECHO_RESTART
:
1511 /* Do the needed accounting and updates
1512 * associated with restarting an initialization
1513 * timer. Only multiply the timeout by two if
1514 * all transports have been tried at the current
1517 sctp_cmd_t1_timer_update(asoc
,
1518 SCTP_EVENT_TIMEOUT_T1_COOKIE
,
1521 /* If we've sent any data bundled with
1522 * COOKIE-ECHO we need to resend.
1524 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
1526 sctp_retransmit_mark(&asoc
->outqueue
, t
,
1530 sctp_add_cmd_sf(commands
,
1531 SCTP_CMD_TIMER_RESTART
,
1532 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE
));
1535 case SCTP_CMD_INIT_FAILED
:
1536 sctp_cmd_init_failed(commands
, asoc
, cmd
->obj
.err
);
1539 case SCTP_CMD_ASSOC_FAILED
:
1540 sctp_cmd_assoc_failed(commands
, asoc
, event_type
,
1541 subtype
, chunk
, cmd
->obj
.err
);
1544 case SCTP_CMD_INIT_COUNTER_INC
:
1545 asoc
->init_err_counter
++;
1548 case SCTP_CMD_INIT_COUNTER_RESET
:
1549 asoc
->init_err_counter
= 0;
1550 asoc
->init_cycle
= 0;
1551 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
1553 t
->init_sent_count
= 0;
1557 case SCTP_CMD_REPORT_DUP
:
1558 sctp_tsnmap_mark_dup(&asoc
->peer
.tsn_map
,
1562 case SCTP_CMD_REPORT_BAD_TAG
:
1563 SCTP_DEBUG_PRINTK("vtag mismatch!\n");
1566 case SCTP_CMD_STRIKE
:
1567 /* Mark one strike against a transport. */
1568 sctp_do_8_2_transport_strike(asoc
, cmd
->obj
.transport
,
1572 case SCTP_CMD_TRANSPORT_IDLE
:
1573 t
= cmd
->obj
.transport
;
1574 sctp_transport_lower_cwnd(t
, SCTP_LOWER_CWND_INACTIVE
);
1577 case SCTP_CMD_TRANSPORT_HB_SENT
:
1578 t
= cmd
->obj
.transport
;
1579 sctp_do_8_2_transport_strike(asoc
, t
, 1);
1583 case SCTP_CMD_TRANSPORT_ON
:
1584 t
= cmd
->obj
.transport
;
1585 sctp_cmd_transport_on(commands
, asoc
, t
, chunk
);
1588 case SCTP_CMD_HB_TIMERS_START
:
1589 sctp_cmd_hb_timers_start(commands
, asoc
);
1592 case SCTP_CMD_HB_TIMER_UPDATE
:
1593 t
= cmd
->obj
.transport
;
1594 sctp_cmd_hb_timer_update(commands
, t
);
1597 case SCTP_CMD_HB_TIMERS_STOP
:
1598 sctp_cmd_hb_timers_stop(commands
, asoc
);
1601 case SCTP_CMD_REPORT_ERROR
:
1602 error
= cmd
->obj
.error
;
1605 case SCTP_CMD_PROCESS_CTSN
:
1606 /* Dummy up a SACK for processing. */
1607 sackh
.cum_tsn_ack
= cmd
->obj
.be32
;
1608 sackh
.a_rwnd
= asoc
->peer
.rwnd
+
1609 asoc
->outqueue
.outstanding_bytes
;
1610 sackh
.num_gap_ack_blocks
= 0;
1611 sackh
.num_dup_tsns
= 0;
1612 sctp_add_cmd_sf(commands
, SCTP_CMD_PROCESS_SACK
,
1613 SCTP_SACKH(&sackh
));
1616 case SCTP_CMD_DISCARD_PACKET
:
1617 /* We need to discard the whole packet.
1618 * Uncork the queue since there might be
1621 chunk
->pdiscard
= 1;
1623 sctp_outq_uncork(&asoc
->outqueue
);
1628 case SCTP_CMD_RTO_PENDING
:
1629 t
= cmd
->obj
.transport
;
1633 case SCTP_CMD_PART_DELIVER
:
1634 sctp_ulpq_partial_delivery(&asoc
->ulpq
, cmd
->obj
.ptr
,
1638 case SCTP_CMD_RENEGE
:
1639 sctp_ulpq_renege(&asoc
->ulpq
, cmd
->obj
.ptr
,
1643 case SCTP_CMD_SETUP_T4
:
1644 sctp_cmd_setup_t4(commands
, asoc
, cmd
->obj
.ptr
);
1647 case SCTP_CMD_PROCESS_OPERR
:
1648 sctp_cmd_process_operr(commands
, asoc
, chunk
);
1650 case SCTP_CMD_CLEAR_INIT_TAG
:
1651 asoc
->peer
.i
.init_tag
= 0;
1653 case SCTP_CMD_DEL_NON_PRIMARY
:
1654 sctp_cmd_del_non_primary(asoc
);
1656 case SCTP_CMD_T3_RTX_TIMERS_STOP
:
1657 sctp_cmd_t3_rtx_timers_stop(commands
, asoc
);
1659 case SCTP_CMD_FORCE_PRIM_RETRAN
:
1660 t
= asoc
->peer
.retran_path
;
1661 asoc
->peer
.retran_path
= asoc
->peer
.primary_path
;
1662 error
= sctp_outq_uncork(&asoc
->outqueue
);
1664 asoc
->peer
.retran_path
= t
;
1666 case SCTP_CMD_SET_SK_ERR
:
1667 sctp_cmd_set_sk_err(asoc
, cmd
->obj
.error
);
1669 case SCTP_CMD_ASSOC_CHANGE
:
1670 sctp_cmd_assoc_change(commands
, asoc
,
1673 case SCTP_CMD_ADAPTATION_IND
:
1674 sctp_cmd_adaptation_ind(commands
, asoc
);
1677 case SCTP_CMD_ASSOC_SHKEY
:
1678 error
= sctp_auth_asoc_init_active_key(asoc
,
1681 case SCTP_CMD_UPDATE_INITTAG
:
1682 asoc
->peer
.i
.init_tag
= cmd
->obj
.u32
;
1684 case SCTP_CMD_SEND_MSG
:
1685 if (!asoc
->outqueue
.cork
) {
1686 sctp_outq_cork(&asoc
->outqueue
);
1689 error
= sctp_cmd_send_msg(asoc
, cmd
->obj
.msg
);
1691 case SCTP_CMD_SEND_NEXT_ASCONF
:
1692 sctp_cmd_send_asconf(asoc
);
1694 case SCTP_CMD_PURGE_ASCONF_QUEUE
:
1695 sctp_asconf_queue_teardown(asoc
);
1698 case SCTP_CMD_SET_ASOC
:
1699 asoc
= cmd
->obj
.asoc
;
1703 pr_warn("Impossible command: %u, %p\n",
1704 cmd
->verb
, cmd
->obj
.ptr
);
1713 /* If this is in response to a received chunk, wait until
1714 * we are done with the packet to open the queue so that we don't
1715 * send multiple packets in response to a single request.
1717 if (asoc
&& SCTP_EVENT_T_CHUNK
== event_type
&& chunk
) {
1718 if (chunk
->end_of_packet
|| chunk
->singleton
)
1719 error
= sctp_outq_uncork(&asoc
->outqueue
);
1720 } else if (local_cork
)
1721 error
= sctp_outq_uncork(&asoc
->outqueue
);