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, see
26 * <http://www.gnu.org/licenses/>.
28 * Please send any bug reports or fixes you make to the
30 * lksctp developers <linux-sctp@vger.kernel.org>
32 * Written or modified by:
33 * La Monte H.P. Yarroll <piggy@acm.org>
34 * Karl Knutson <karl@athena.chicago.il.us>
35 * Jon Grimm <jgrimm@austin.ibm.com>
36 * Hui Huang <hui.huang@nokia.com>
37 * Dajiang Zhang <dajiang.zhang@nokia.com>
38 * Daisy Chang <daisyc@us.ibm.com>
39 * Sridhar Samudrala <sri@us.ibm.com>
40 * Ardelle Fan <ardelle.fan@intel.com>
43 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
45 #include <linux/skbuff.h>
46 #include <linux/types.h>
47 #include <linux/socket.h>
49 #include <linux/gfp.h>
51 #include <net/sctp/sctp.h>
52 #include <net/sctp/sm.h>
54 static int sctp_cmd_interpreter(sctp_event_t event_type
,
55 sctp_subtype_t subtype
,
57 struct sctp_endpoint
*ep
,
58 struct sctp_association
*asoc
,
60 sctp_disposition_t status
,
61 sctp_cmd_seq_t
*commands
,
63 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
65 struct sctp_endpoint
*ep
,
66 struct sctp_association
**asoc
,
68 sctp_disposition_t status
,
69 sctp_cmd_seq_t
*commands
,
72 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t
*cmds
,
73 struct sctp_transport
*t
);
74 /********************************************************************
76 ********************************************************************/
78 /* A helper function for delayed processing of INET ECN CE bit. */
79 static void sctp_do_ecn_ce_work(struct sctp_association
*asoc
,
82 /* Save the TSN away for comparison when we receive CWR */
84 asoc
->last_ecne_tsn
= lowest_tsn
;
88 /* Helper function for delayed processing of SCTP ECNE chunk. */
89 /* RFC 2960 Appendix A
91 * RFC 2481 details a specific bit for a sender to send in
92 * the header of its next outbound TCP segment to indicate to
93 * its peer that it has reduced its congestion window. This
94 * is termed the CWR bit. For SCTP the same indication is made
95 * by including the CWR chunk. This chunk contains one data
96 * element, i.e. the TSN number that was sent in the ECNE chunk.
97 * This element represents the lowest TSN number in the datagram
98 * that was originally marked with the CE bit.
100 static struct sctp_chunk
*sctp_do_ecn_ecne_work(struct sctp_association
*asoc
,
102 struct sctp_chunk
*chunk
)
104 struct sctp_chunk
*repl
;
106 /* Our previously transmitted packet ran into some congestion
107 * so we should take action by reducing cwnd and ssthresh
108 * and then ACK our peer that we we've done so by
112 /* First, try to determine if we want to actually lower
113 * our cwnd variables. Only lower them if the ECNE looks more
114 * recent than the last response.
116 if (TSN_lt(asoc
->last_cwr_tsn
, lowest_tsn
)) {
117 struct sctp_transport
*transport
;
119 /* Find which transport's congestion variables
120 * need to be adjusted.
122 transport
= sctp_assoc_lookup_tsn(asoc
, lowest_tsn
);
124 /* Update the congestion variables. */
126 sctp_transport_lower_cwnd(transport
,
127 SCTP_LOWER_CWND_ECNE
);
128 asoc
->last_cwr_tsn
= lowest_tsn
;
131 /* Always try to quiet the other end. In case of lost CWR,
132 * resend last_cwr_tsn.
134 repl
= sctp_make_cwr(asoc
, asoc
->last_cwr_tsn
, chunk
);
136 /* If we run out of memory, it will look like a lost CWR. We'll
137 * get back in sync eventually.
142 /* Helper function to do delayed processing of ECN CWR chunk. */
143 static void sctp_do_ecn_cwr_work(struct sctp_association
*asoc
,
146 /* Turn off ECNE getting auto-prepended to every outgoing
152 /* Generate SACK if necessary. We call this at the end of a packet. */
153 static int sctp_gen_sack(struct sctp_association
*asoc
, int force
,
154 sctp_cmd_seq_t
*commands
)
156 __u32 ctsn
, max_tsn_seen
;
157 struct sctp_chunk
*sack
;
158 struct sctp_transport
*trans
= asoc
->peer
.last_data_from
;
162 (!trans
&& (asoc
->param_flags
& SPP_SACKDELAY_DISABLE
)) ||
163 (trans
&& (trans
->param_flags
& SPP_SACKDELAY_DISABLE
)))
164 asoc
->peer
.sack_needed
= 1;
166 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
167 max_tsn_seen
= sctp_tsnmap_get_max_tsn_seen(&asoc
->peer
.tsn_map
);
169 /* From 12.2 Parameters necessary per association (i.e. the TCB):
171 * Ack State : This flag indicates if the next received packet
172 * : is to be responded to with a SACK. ...
173 * : When DATA chunks are out of order, SACK's
174 * : are not delayed (see Section 6).
176 * [This is actually not mentioned in Section 6, but we
177 * implement it here anyway. --piggy]
179 if (max_tsn_seen
!= ctsn
)
180 asoc
->peer
.sack_needed
= 1;
182 /* From 6.2 Acknowledgement on Reception of DATA Chunks:
184 * Section 4.2 of [RFC2581] SHOULD be followed. Specifically,
185 * an acknowledgement SHOULD be generated for at least every
186 * second packet (not every second DATA chunk) received, and
187 * SHOULD be generated within 200 ms of the arrival of any
188 * unacknowledged DATA chunk. ...
190 if (!asoc
->peer
.sack_needed
) {
191 asoc
->peer
.sack_cnt
++;
193 /* Set the SACK delay timeout based on the
194 * SACK delay for the last transport
195 * data was received from, or the default
196 * for the association.
199 /* We will need a SACK for the next packet. */
200 if (asoc
->peer
.sack_cnt
>= trans
->sackfreq
- 1)
201 asoc
->peer
.sack_needed
= 1;
203 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
206 /* We will need a SACK for the next packet. */
207 if (asoc
->peer
.sack_cnt
>= asoc
->sackfreq
- 1)
208 asoc
->peer
.sack_needed
= 1;
210 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
214 /* Restart the SACK timer. */
215 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
216 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
218 __u32 old_a_rwnd
= asoc
->a_rwnd
;
220 asoc
->a_rwnd
= asoc
->rwnd
;
221 sack
= sctp_make_sack(asoc
);
223 asoc
->a_rwnd
= old_a_rwnd
;
227 asoc
->peer
.sack_needed
= 0;
228 asoc
->peer
.sack_cnt
= 0;
230 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
, SCTP_CHUNK(sack
));
232 /* Stop the SACK timer. */
233 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_STOP
,
234 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
243 /* When the T3-RTX timer expires, it calls this function to create the
244 * relevant state machine event.
246 void sctp_generate_t3_rtx_event(unsigned long peer
)
249 struct sctp_transport
*transport
= (struct sctp_transport
*) peer
;
250 struct sctp_association
*asoc
= transport
->asoc
;
251 struct sock
*sk
= asoc
->base
.sk
;
252 struct net
*net
= sock_net(sk
);
254 /* Check whether a task is in the sock. */
257 if (sock_owned_by_user(sk
)) {
258 pr_debug("%s: sock is busy\n", __func__
);
260 /* Try again later. */
261 if (!mod_timer(&transport
->T3_rtx_timer
, jiffies
+ (HZ
/20)))
262 sctp_transport_hold(transport
);
266 /* Run through the state machine. */
267 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
268 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX
),
271 transport
, GFP_ATOMIC
);
278 sctp_transport_put(transport
);
281 /* This is a sa interface for producing timeout events. It works
282 * for timeouts which use the association as their parameter.
284 static void sctp_generate_timeout_event(struct sctp_association
*asoc
,
285 sctp_event_timeout_t timeout_type
)
287 struct sock
*sk
= asoc
->base
.sk
;
288 struct net
*net
= sock_net(sk
);
292 if (sock_owned_by_user(sk
)) {
293 pr_debug("%s: sock is busy: timer %d\n", __func__
,
296 /* Try again later. */
297 if (!mod_timer(&asoc
->timers
[timeout_type
], jiffies
+ (HZ
/20)))
298 sctp_association_hold(asoc
);
302 /* Is this association really dead and just waiting around for
303 * the timer to let go of the reference?
308 /* Run through the state machine. */
309 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
310 SCTP_ST_TIMEOUT(timeout_type
),
311 asoc
->state
, asoc
->ep
, asoc
,
312 (void *)timeout_type
, GFP_ATOMIC
);
319 sctp_association_put(asoc
);
322 static void sctp_generate_t1_cookie_event(unsigned long data
)
324 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
325 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_COOKIE
);
328 static void sctp_generate_t1_init_event(unsigned long data
)
330 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
331 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_INIT
);
334 static void sctp_generate_t2_shutdown_event(unsigned long data
)
336 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
337 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
);
340 static void sctp_generate_t4_rto_event(unsigned long data
)
342 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
343 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T4_RTO
);
346 static void sctp_generate_t5_shutdown_guard_event(unsigned long data
)
348 struct sctp_association
*asoc
= (struct sctp_association
*)data
;
349 sctp_generate_timeout_event(asoc
,
350 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD
);
352 } /* sctp_generate_t5_shutdown_guard_event() */
354 static void sctp_generate_autoclose_event(unsigned long data
)
356 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
357 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_AUTOCLOSE
);
360 /* Generate a heart beat event. If the sock is busy, reschedule. Make
361 * sure that the transport is still valid.
363 void sctp_generate_heartbeat_event(unsigned long data
)
366 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
367 struct sctp_association
*asoc
= transport
->asoc
;
368 struct sock
*sk
= asoc
->base
.sk
;
369 struct net
*net
= sock_net(sk
);
372 if (sock_owned_by_user(sk
)) {
373 pr_debug("%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 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
382 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT
),
383 asoc
->state
, asoc
->ep
, asoc
,
384 transport
, GFP_ATOMIC
);
391 sctp_transport_put(transport
);
394 /* Handle the timeout of the ICMP protocol unreachable timer. Trigger
395 * the correct state machine transition that will close the association.
397 void sctp_generate_proto_unreach_event(unsigned long data
)
399 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
400 struct sctp_association
*asoc
= transport
->asoc
;
401 struct sock
*sk
= asoc
->base
.sk
;
402 struct net
*net
= sock_net(sk
);
405 if (sock_owned_by_user(sk
)) {
406 pr_debug("%s: sock is busy\n", __func__
);
408 /* Try again later. */
409 if (!mod_timer(&transport
->proto_unreach_timer
,
411 sctp_association_hold(asoc
);
415 /* Is this structure just waiting around for us to actually
421 sctp_do_sm(net
, SCTP_EVENT_T_OTHER
,
422 SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH
),
423 asoc
->state
, asoc
->ep
, asoc
, transport
, GFP_ATOMIC
);
427 sctp_association_put(asoc
);
431 /* Inject a SACK Timeout event into the state machine. */
432 static void sctp_generate_sack_event(unsigned long data
)
434 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
435 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_SACK
);
438 sctp_timer_event_t
*sctp_timer_events
[SCTP_NUM_TIMEOUT_TYPES
] = {
440 sctp_generate_t1_cookie_event
,
441 sctp_generate_t1_init_event
,
442 sctp_generate_t2_shutdown_event
,
444 sctp_generate_t4_rto_event
,
445 sctp_generate_t5_shutdown_guard_event
,
447 sctp_generate_sack_event
,
448 sctp_generate_autoclose_event
,
452 /* RFC 2960 8.2 Path Failure Detection
454 * When its peer endpoint is multi-homed, an endpoint should keep a
455 * error counter for each of the destination transport addresses of the
458 * Each time the T3-rtx timer expires on any address, or when a
459 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
460 * the error counter of that destination address will be incremented.
461 * When the value in the error counter exceeds the protocol parameter
462 * 'Path.Max.Retrans' of that destination address, the endpoint should
463 * mark the destination transport address as inactive, and a
464 * notification SHOULD be sent to the upper layer.
467 static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t
*commands
,
468 struct sctp_association
*asoc
,
469 struct sctp_transport
*transport
,
472 struct net
*net
= sock_net(asoc
->base
.sk
);
474 /* The check for association's overall error counter exceeding the
475 * threshold is done in the state function.
477 /* We are here due to a timer expiration. If the timer was
478 * not a HEARTBEAT, then normal error tracking is done.
479 * If the timer was a heartbeat, we only increment error counts
480 * when we already have an outstanding HEARTBEAT that has not
482 * Additionally, some tranport states inhibit error increments.
485 asoc
->overall_error_count
++;
486 if (transport
->state
!= SCTP_INACTIVE
)
487 transport
->error_count
++;
488 } else if (transport
->hb_sent
) {
489 if (transport
->state
!= SCTP_UNCONFIRMED
)
490 asoc
->overall_error_count
++;
491 if (transport
->state
!= SCTP_INACTIVE
)
492 transport
->error_count
++;
495 /* If the transport error count is greater than the pf_retrans
496 * threshold, and less than pathmaxrtx, and if the current state
497 * is SCTP_ACTIVE, then mark this transport as Partially Failed,
498 * see SCTP Quick Failover Draft, section 5.1
500 if (net
->sctp
.pf_enable
&&
501 (transport
->state
== SCTP_ACTIVE
) &&
502 (asoc
->pf_retrans
< transport
->pathmaxrxt
) &&
503 (transport
->error_count
> asoc
->pf_retrans
)) {
505 sctp_assoc_control_transport(asoc
, transport
,
509 /* Update the hb timer to resend a heartbeat every rto */
510 sctp_cmd_hb_timer_update(commands
, transport
);
513 if (transport
->state
!= SCTP_INACTIVE
&&
514 (transport
->error_count
> transport
->pathmaxrxt
)) {
515 pr_debug("%s: association:%p transport addr:%pISpc failed\n",
516 __func__
, asoc
, &transport
->ipaddr
.sa
);
518 sctp_assoc_control_transport(asoc
, transport
,
520 SCTP_FAILED_THRESHOLD
);
523 /* E2) For the destination address for which the timer
524 * expires, set RTO <- RTO * 2 ("back off the timer"). The
525 * maximum value discussed in rule C7 above (RTO.max) may be
526 * used to provide an upper bound to this doubling operation.
528 * Special Case: the first HB doesn't trigger exponential backoff.
529 * The first unacknowledged HB triggers it. We do this with a flag
530 * that indicates that we have an outstanding HB.
532 if (!is_hb
|| transport
->hb_sent
) {
533 transport
->rto
= min((transport
->rto
* 2), transport
->asoc
->rto_max
);
534 sctp_max_rto(asoc
, transport
);
538 /* Worker routine to handle INIT command failure. */
539 static void sctp_cmd_init_failed(sctp_cmd_seq_t
*commands
,
540 struct sctp_association
*asoc
,
543 struct sctp_ulpevent
*event
;
545 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_CANT_STR_ASSOC
,
546 (__u16
)error
, 0, 0, NULL
,
550 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
551 SCTP_ULPEVENT(event
));
553 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
554 SCTP_STATE(SCTP_STATE_CLOSED
));
556 /* SEND_FAILED sent later when cleaning up the association. */
557 asoc
->outqueue
.error
= error
;
558 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
561 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
562 static void sctp_cmd_assoc_failed(sctp_cmd_seq_t
*commands
,
563 struct sctp_association
*asoc
,
564 sctp_event_t event_type
,
565 sctp_subtype_t subtype
,
566 struct sctp_chunk
*chunk
,
569 struct sctp_ulpevent
*event
;
570 struct sctp_chunk
*abort
;
571 /* Cancel any partial delivery in progress. */
572 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
574 if (event_type
== SCTP_EVENT_T_CHUNK
&& subtype
.chunk
== SCTP_CID_ABORT
)
575 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
576 (__u16
)error
, 0, 0, chunk
,
579 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
580 (__u16
)error
, 0, 0, NULL
,
583 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
584 SCTP_ULPEVENT(event
));
586 if (asoc
->overall_error_count
>= asoc
->max_retrans
) {
587 abort
= sctp_make_violation_max_retrans(asoc
, chunk
);
589 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
593 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
594 SCTP_STATE(SCTP_STATE_CLOSED
));
596 /* SEND_FAILED sent later when cleaning up the association. */
597 asoc
->outqueue
.error
= error
;
598 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
601 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
602 * inside the cookie. In reality, this is only used for INIT-ACK processing
603 * since all other cases use "temporary" associations and can do all
604 * their work in statefuns directly.
606 static int sctp_cmd_process_init(sctp_cmd_seq_t
*commands
,
607 struct sctp_association
*asoc
,
608 struct sctp_chunk
*chunk
,
609 sctp_init_chunk_t
*peer_init
,
614 /* We only process the init as a sideeffect in a single
615 * case. This is when we process the INIT-ACK. If we
616 * fail during INIT processing (due to malloc problems),
617 * just return the error and stop processing the stack.
619 if (!sctp_process_init(asoc
, chunk
, sctp_source(chunk
), peer_init
, gfp
))
627 /* Helper function to break out starting up of heartbeat timers. */
628 static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t
*cmds
,
629 struct sctp_association
*asoc
)
631 struct sctp_transport
*t
;
633 /* Start a heartbeat timer for each transport on the association.
634 * hold a reference on the transport to make sure none of
635 * the needed data structures go away.
637 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
, transports
) {
639 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
640 sctp_transport_hold(t
);
644 static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t
*cmds
,
645 struct sctp_association
*asoc
)
647 struct sctp_transport
*t
;
649 /* Stop all heartbeat timers. */
651 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
653 if (del_timer(&t
->hb_timer
))
654 sctp_transport_put(t
);
658 /* Helper function to stop any pending T3-RTX timers */
659 static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t
*cmds
,
660 struct sctp_association
*asoc
)
662 struct sctp_transport
*t
;
664 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
666 if (del_timer(&t
->T3_rtx_timer
))
667 sctp_transport_put(t
);
672 /* Helper function to update the heartbeat timer. */
673 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t
*cmds
,
674 struct sctp_transport
*t
)
676 /* Update the heartbeat timer. */
677 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
678 sctp_transport_hold(t
);
681 /* Helper function to handle the reception of an HEARTBEAT ACK. */
682 static void sctp_cmd_transport_on(sctp_cmd_seq_t
*cmds
,
683 struct sctp_association
*asoc
,
684 struct sctp_transport
*t
,
685 struct sctp_chunk
*chunk
)
687 sctp_sender_hb_info_t
*hbinfo
;
688 int was_unconfirmed
= 0;
690 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
691 * HEARTBEAT should clear the error counter of the destination
692 * transport address to which the HEARTBEAT was sent.
697 * Although RFC4960 specifies that the overall error count must
698 * be cleared when a HEARTBEAT ACK is received, we make an
699 * exception while in SHUTDOWN PENDING. If the peer keeps its
700 * window shut forever, we may never be able to transmit our
701 * outstanding data and rely on the retransmission limit be reached
702 * to shutdown the association.
704 if (t
->asoc
->state
< SCTP_STATE_SHUTDOWN_PENDING
)
705 t
->asoc
->overall_error_count
= 0;
707 /* Clear the hb_sent flag to signal that we had a good
712 /* Mark the destination transport address as active if it is not so
715 if ((t
->state
== SCTP_INACTIVE
) || (t
->state
== SCTP_UNCONFIRMED
)) {
717 sctp_assoc_control_transport(asoc
, t
, SCTP_TRANSPORT_UP
,
718 SCTP_HEARTBEAT_SUCCESS
);
721 if (t
->state
== SCTP_PF
)
722 sctp_assoc_control_transport(asoc
, t
, SCTP_TRANSPORT_UP
,
723 SCTP_HEARTBEAT_SUCCESS
);
725 /* HB-ACK was received for a the proper HB. Consider this
731 /* The receiver of the HEARTBEAT ACK should also perform an
732 * RTT measurement for that destination transport address
733 * using the time value carried in the HEARTBEAT ACK chunk.
734 * If the transport's rto_pending variable has been cleared,
735 * it was most likely due to a retransmit. However, we want
736 * to re-enable it to properly update the rto.
738 if (t
->rto_pending
== 0)
741 hbinfo
= (sctp_sender_hb_info_t
*) chunk
->skb
->data
;
742 sctp_transport_update_rto(t
, (jiffies
- hbinfo
->sent_at
));
744 /* Update the heartbeat timer. */
745 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
746 sctp_transport_hold(t
);
748 if (was_unconfirmed
&& asoc
->peer
.transport_count
== 1)
749 sctp_transport_immediate_rtx(t
);
753 /* Helper function to process the process SACK command. */
754 static int sctp_cmd_process_sack(sctp_cmd_seq_t
*cmds
,
755 struct sctp_association
*asoc
,
756 struct sctp_chunk
*chunk
)
760 if (sctp_outq_sack(&asoc
->outqueue
, chunk
)) {
761 struct net
*net
= sock_net(asoc
->base
.sk
);
763 /* There are no more TSNs awaiting SACK. */
764 err
= sctp_do_sm(net
, SCTP_EVENT_T_OTHER
,
765 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN
),
766 asoc
->state
, asoc
->ep
, asoc
, NULL
,
773 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
774 * the transport for a shutdown chunk.
776 static void sctp_cmd_setup_t2(sctp_cmd_seq_t
*cmds
,
777 struct sctp_association
*asoc
,
778 struct sctp_chunk
*chunk
)
780 struct sctp_transport
*t
;
782 if (chunk
->transport
)
783 t
= chunk
->transport
;
785 t
= sctp_assoc_choose_alter_transport(asoc
,
786 asoc
->shutdown_last_sent_to
);
787 chunk
->transport
= t
;
789 asoc
->shutdown_last_sent_to
= t
;
790 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
] = t
->rto
;
793 /* Helper function to change the state of an association. */
794 static void sctp_cmd_new_state(sctp_cmd_seq_t
*cmds
,
795 struct sctp_association
*asoc
,
798 struct sock
*sk
= asoc
->base
.sk
;
802 pr_debug("%s: asoc:%p[%s]\n", __func__
, asoc
, sctp_state_tbl
[state
]);
804 if (sctp_style(sk
, TCP
)) {
805 /* Change the sk->sk_state of a TCP-style socket that has
806 * successfully completed a connect() call.
808 if (sctp_state(asoc
, ESTABLISHED
) && sctp_sstate(sk
, CLOSED
))
809 sk
->sk_state
= SCTP_SS_ESTABLISHED
;
811 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
812 if (sctp_state(asoc
, SHUTDOWN_RECEIVED
) &&
813 sctp_sstate(sk
, ESTABLISHED
))
814 sk
->sk_shutdown
|= RCV_SHUTDOWN
;
817 if (sctp_state(asoc
, COOKIE_WAIT
)) {
818 /* Reset init timeouts since they may have been
819 * increased due to timer expirations.
821 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] =
823 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] =
827 if (sctp_state(asoc
, ESTABLISHED
) ||
828 sctp_state(asoc
, CLOSED
) ||
829 sctp_state(asoc
, SHUTDOWN_RECEIVED
)) {
830 /* Wake up any processes waiting in the asoc's wait queue in
831 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
833 if (waitqueue_active(&asoc
->wait
))
834 wake_up_interruptible(&asoc
->wait
);
836 /* Wake up any processes waiting in the sk's sleep queue of
837 * a TCP-style or UDP-style peeled-off socket in
838 * sctp_wait_for_accept() or sctp_wait_for_packet().
839 * For a UDP-style socket, the waiters are woken up by the
842 if (!sctp_style(sk
, UDP
))
843 sk
->sk_state_change(sk
);
847 /* Helper function to delete an association. */
848 static void sctp_cmd_delete_tcb(sctp_cmd_seq_t
*cmds
,
849 struct sctp_association
*asoc
)
851 struct sock
*sk
= asoc
->base
.sk
;
853 /* If it is a non-temporary association belonging to a TCP-style
854 * listening socket that is not closed, do not free it so that accept()
855 * can pick it up later.
857 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
) &&
858 (!asoc
->temp
) && (sk
->sk_shutdown
!= SHUTDOWN_MASK
))
861 sctp_association_free(asoc
);
865 * ADDIP Section 4.1 ASCONF Chunk Procedures
866 * A4) Start a T-4 RTO timer, using the RTO value of the selected
867 * destination address (we use active path instead of primary path just
868 * because primary path may be inactive.
870 static void sctp_cmd_setup_t4(sctp_cmd_seq_t
*cmds
,
871 struct sctp_association
*asoc
,
872 struct sctp_chunk
*chunk
)
874 struct sctp_transport
*t
;
876 t
= sctp_assoc_choose_alter_transport(asoc
, chunk
->transport
);
877 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T4_RTO
] = t
->rto
;
878 chunk
->transport
= t
;
881 /* Process an incoming Operation Error Chunk. */
882 static void sctp_cmd_process_operr(sctp_cmd_seq_t
*cmds
,
883 struct sctp_association
*asoc
,
884 struct sctp_chunk
*chunk
)
886 struct sctp_errhdr
*err_hdr
;
887 struct sctp_ulpevent
*ev
;
889 while (chunk
->chunk_end
> chunk
->skb
->data
) {
890 err_hdr
= (struct sctp_errhdr
*)(chunk
->skb
->data
);
892 ev
= sctp_ulpevent_make_remote_error(asoc
, chunk
, 0,
897 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
899 switch (err_hdr
->cause
) {
900 case SCTP_ERROR_UNKNOWN_CHUNK
:
902 sctp_chunkhdr_t
*unk_chunk_hdr
;
904 unk_chunk_hdr
= (sctp_chunkhdr_t
*)err_hdr
->variable
;
905 switch (unk_chunk_hdr
->type
) {
906 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with
907 * an ERROR chunk reporting that it did not recognized
908 * the ASCONF chunk type, the sender of the ASCONF MUST
909 * NOT send any further ASCONF chunks and MUST stop its
912 case SCTP_CID_ASCONF
:
913 if (asoc
->peer
.asconf_capable
== 0)
916 asoc
->peer
.asconf_capable
= 0;
917 sctp_add_cmd_sf(cmds
, SCTP_CMD_TIMER_STOP
,
918 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO
));
931 /* Process variable FWDTSN chunk information. */
932 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq
*ulpq
,
933 struct sctp_chunk
*chunk
)
935 struct sctp_fwdtsn_skip
*skip
;
936 /* Walk through all the skipped SSNs */
937 sctp_walk_fwdtsn(skip
, chunk
) {
938 sctp_ulpq_skip(ulpq
, ntohs(skip
->stream
), ntohs(skip
->ssn
));
942 /* Helper function to remove the association non-primary peer
945 static void sctp_cmd_del_non_primary(struct sctp_association
*asoc
)
947 struct sctp_transport
*t
;
948 struct list_head
*pos
;
949 struct list_head
*temp
;
951 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
952 t
= list_entry(pos
, struct sctp_transport
, transports
);
953 if (!sctp_cmp_addr_exact(&t
->ipaddr
,
954 &asoc
->peer
.primary_addr
)) {
955 sctp_assoc_rm_peer(asoc
, t
);
960 /* Helper function to set sk_err on a 1-1 style socket. */
961 static void sctp_cmd_set_sk_err(struct sctp_association
*asoc
, int error
)
963 struct sock
*sk
= asoc
->base
.sk
;
965 if (!sctp_style(sk
, UDP
))
969 /* Helper function to generate an association change event */
970 static void sctp_cmd_assoc_change(sctp_cmd_seq_t
*commands
,
971 struct sctp_association
*asoc
,
974 struct sctp_ulpevent
*ev
;
976 ev
= sctp_ulpevent_make_assoc_change(asoc
, 0, state
, 0,
977 asoc
->c
.sinit_num_ostreams
,
978 asoc
->c
.sinit_max_instreams
,
981 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
984 /* Helper function to generate an adaptation indication event */
985 static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t
*commands
,
986 struct sctp_association
*asoc
)
988 struct sctp_ulpevent
*ev
;
990 ev
= sctp_ulpevent_make_adaptation_indication(asoc
, GFP_ATOMIC
);
993 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
997 static void sctp_cmd_t1_timer_update(struct sctp_association
*asoc
,
998 sctp_event_timeout_t timer
,
1001 struct sctp_transport
*t
;
1003 t
= asoc
->init_last_sent_to
;
1004 asoc
->init_err_counter
++;
1006 if (t
->init_sent_count
> (asoc
->init_cycle
+ 1)) {
1007 asoc
->timeouts
[timer
] *= 2;
1008 if (asoc
->timeouts
[timer
] > asoc
->max_init_timeo
) {
1009 asoc
->timeouts
[timer
] = asoc
->max_init_timeo
;
1013 pr_debug("%s: T1[%s] timeout adjustment init_err_counter:%d"
1014 " cycle:%d timeout:%ld\n", __func__
, name
,
1015 asoc
->init_err_counter
, asoc
->init_cycle
,
1016 asoc
->timeouts
[timer
]);
1021 /* Send the whole message, chunk by chunk, to the outqueue.
1022 * This way the whole message is queued up and bundling if
1023 * encouraged for small fragments.
1025 static int sctp_cmd_send_msg(struct sctp_association
*asoc
,
1026 struct sctp_datamsg
*msg
, gfp_t gfp
)
1028 struct sctp_chunk
*chunk
;
1031 list_for_each_entry(chunk
, &msg
->chunks
, frag_list
) {
1032 error
= sctp_outq_tail(&asoc
->outqueue
, chunk
, gfp
);
1041 /* Sent the next ASCONF packet currently stored in the association.
1042 * This happens after the ASCONF_ACK was succeffully processed.
1044 static void sctp_cmd_send_asconf(struct sctp_association
*asoc
)
1046 struct net
*net
= sock_net(asoc
->base
.sk
);
1048 /* Send the next asconf chunk from the addip chunk
1051 if (!list_empty(&asoc
->addip_chunk_list
)) {
1052 struct list_head
*entry
= asoc
->addip_chunk_list
.next
;
1053 struct sctp_chunk
*asconf
= list_entry(entry
,
1054 struct sctp_chunk
, list
);
1055 list_del_init(entry
);
1057 /* Hold the chunk until an ASCONF_ACK is received. */
1058 sctp_chunk_hold(asconf
);
1059 if (sctp_primitive_ASCONF(net
, asoc
, asconf
))
1060 sctp_chunk_free(asconf
);
1062 asoc
->addip_last_asconf
= asconf
;
1067 /* These three macros allow us to pull the debugging code out of the
1068 * main flow of sctp_do_sm() to keep attention focused on the real
1069 * functionality there.
1071 #define debug_pre_sfn() \
1072 pr_debug("%s[pre-fn]: ep:%p, %s, %s, asoc:%p[%s], %s\n", __func__, \
1073 ep, sctp_evttype_tbl[event_type], (*debug_fn)(subtype), \
1074 asoc, sctp_state_tbl[state], state_fn->name)
1076 #define debug_post_sfn() \
1077 pr_debug("%s[post-fn]: asoc:%p, status:%s\n", __func__, asoc, \
1078 sctp_status_tbl[status])
1080 #define debug_post_sfx() \
1081 pr_debug("%s[post-sfx]: error:%d, asoc:%p[%s]\n", __func__, error, \
1082 asoc, sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
1083 sctp_assoc2id(asoc))) ? asoc->state : SCTP_STATE_CLOSED])
1086 * This is the master state machine processing function.
1088 * If you want to understand all of lksctp, this is a
1089 * good place to start.
1091 int sctp_do_sm(struct net
*net
, sctp_event_t event_type
, sctp_subtype_t subtype
,
1093 struct sctp_endpoint
*ep
,
1094 struct sctp_association
*asoc
,
1098 sctp_cmd_seq_t commands
;
1099 const sctp_sm_table_entry_t
*state_fn
;
1100 sctp_disposition_t status
;
1102 typedef const char *(printfn_t
)(sctp_subtype_t
);
1103 static printfn_t
*table
[] = {
1104 NULL
, sctp_cname
, sctp_tname
, sctp_oname
, sctp_pname
,
1106 printfn_t
*debug_fn
__attribute__ ((unused
)) = table
[event_type
];
1108 /* Look up the state function, run it, and then process the
1109 * side effects. These three steps are the heart of lksctp.
1111 state_fn
= sctp_sm_lookup_event(net
, event_type
, state
, subtype
);
1113 sctp_init_cmd_seq(&commands
);
1116 status
= state_fn
->fn(net
, ep
, asoc
, subtype
, event_arg
, &commands
);
1119 error
= sctp_side_effects(event_type
, subtype
, state
,
1120 ep
, &asoc
, event_arg
, status
,
1127 /*****************************************************************
1128 * This the master state function side effect processing function.
1129 *****************************************************************/
1130 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
1132 struct sctp_endpoint
*ep
,
1133 struct sctp_association
**asoc
,
1135 sctp_disposition_t status
,
1136 sctp_cmd_seq_t
*commands
,
1141 /* FIXME - Most of the dispositions left today would be categorized
1142 * as "exceptional" dispositions. For those dispositions, it
1143 * may not be proper to run through any of the commands at all.
1144 * For example, the command interpreter might be run only with
1145 * disposition SCTP_DISPOSITION_CONSUME.
1147 if (0 != (error
= sctp_cmd_interpreter(event_type
, subtype
, state
,
1154 case SCTP_DISPOSITION_DISCARD
:
1155 pr_debug("%s: ignored sctp protocol event - state:%d, "
1156 "event_type:%d, event_id:%d\n", __func__
, state
,
1157 event_type
, subtype
.chunk
);
1160 case SCTP_DISPOSITION_NOMEM
:
1161 /* We ran out of memory, so we need to discard this
1164 /* BUG--we should now recover some memory, probably by
1170 case SCTP_DISPOSITION_DELETE_TCB
:
1171 case SCTP_DISPOSITION_ABORT
:
1172 /* This should now be a command. */
1176 case SCTP_DISPOSITION_CONSUME
:
1178 * We should no longer have much work to do here as the
1179 * real work has been done as explicit commands above.
1183 case SCTP_DISPOSITION_VIOLATION
:
1184 net_err_ratelimited("protocol violation state %d chunkid %d\n",
1185 state
, subtype
.chunk
);
1188 case SCTP_DISPOSITION_NOT_IMPL
:
1189 pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n",
1190 state
, event_type
, subtype
.chunk
);
1193 case SCTP_DISPOSITION_BUG
:
1194 pr_err("bug in state %d, event_type %d, event_id %d\n",
1195 state
, event_type
, subtype
.chunk
);
1200 pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n",
1201 status
, state
, event_type
, subtype
.chunk
);
1210 /********************************************************************
1211 * 2nd Level Abstractions
1212 ********************************************************************/
1214 /* This is the side-effect interpreter. */
1215 static int sctp_cmd_interpreter(sctp_event_t event_type
,
1216 sctp_subtype_t subtype
,
1218 struct sctp_endpoint
*ep
,
1219 struct sctp_association
*asoc
,
1221 sctp_disposition_t status
,
1222 sctp_cmd_seq_t
*commands
,
1225 struct sock
*sk
= ep
->base
.sk
;
1226 struct sctp_sock
*sp
= sctp_sk(sk
);
1230 struct sctp_chunk
*new_obj
;
1231 struct sctp_chunk
*chunk
= NULL
;
1232 struct sctp_packet
*packet
;
1233 struct timer_list
*timer
;
1234 unsigned long timeout
;
1235 struct sctp_transport
*t
;
1236 struct sctp_sackhdr sackh
;
1239 if (SCTP_EVENT_T_TIMEOUT
!= event_type
)
1242 /* Note: This whole file is a huge candidate for rework.
1243 * For example, each command could either have its own handler, so
1244 * the loop would look like:
1246 * cmd->handle(x, y, z)
1249 while (NULL
!= (cmd
= sctp_next_cmd(commands
))) {
1250 switch (cmd
->verb
) {
1255 case SCTP_CMD_NEW_ASOC
:
1256 /* Register a new association. */
1258 sctp_outq_uncork(&asoc
->outqueue
, gfp
);
1262 /* Register with the endpoint. */
1263 asoc
= cmd
->obj
.asoc
;
1264 BUG_ON(asoc
->peer
.primary_path
== NULL
);
1265 sctp_endpoint_add_asoc(ep
, asoc
);
1268 case SCTP_CMD_UPDATE_ASSOC
:
1269 sctp_assoc_update(asoc
, cmd
->obj
.asoc
);
1272 case SCTP_CMD_PURGE_OUTQUEUE
:
1273 sctp_outq_teardown(&asoc
->outqueue
);
1276 case SCTP_CMD_DELETE_TCB
:
1278 sctp_outq_uncork(&asoc
->outqueue
, gfp
);
1281 /* Delete the current association. */
1282 sctp_cmd_delete_tcb(commands
, asoc
);
1286 case SCTP_CMD_NEW_STATE
:
1287 /* Enter a new state. */
1288 sctp_cmd_new_state(commands
, asoc
, cmd
->obj
.state
);
1291 case SCTP_CMD_REPORT_TSN
:
1292 /* Record the arrival of a TSN. */
1293 error
= sctp_tsnmap_mark(&asoc
->peer
.tsn_map
,
1294 cmd
->obj
.u32
, NULL
);
1297 case SCTP_CMD_REPORT_FWDTSN
:
1298 /* Move the Cumulattive TSN Ack ahead. */
1299 sctp_tsnmap_skip(&asoc
->peer
.tsn_map
, cmd
->obj
.u32
);
1301 /* purge the fragmentation queue */
1302 sctp_ulpq_reasm_flushtsn(&asoc
->ulpq
, cmd
->obj
.u32
);
1304 /* Abort any in progress partial delivery. */
1305 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
1308 case SCTP_CMD_PROCESS_FWDTSN
:
1309 sctp_cmd_process_fwdtsn(&asoc
->ulpq
, cmd
->obj
.chunk
);
1312 case SCTP_CMD_GEN_SACK
:
1313 /* Generate a Selective ACK.
1314 * The argument tells us whether to just count
1315 * the packet and MAYBE generate a SACK, or
1318 force
= cmd
->obj
.i32
;
1319 error
= sctp_gen_sack(asoc
, force
, commands
);
1322 case SCTP_CMD_PROCESS_SACK
:
1323 /* Process an inbound SACK. */
1324 error
= sctp_cmd_process_sack(commands
, asoc
,
1328 case SCTP_CMD_GEN_INIT_ACK
:
1329 /* Generate an INIT ACK chunk. */
1330 new_obj
= sctp_make_init_ack(asoc
, chunk
, GFP_ATOMIC
,
1335 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1336 SCTP_CHUNK(new_obj
));
1339 case SCTP_CMD_PEER_INIT
:
1340 /* Process a unified INIT from the peer.
1341 * Note: Only used during INIT-ACK processing. If
1342 * there is an error just return to the outter
1343 * layer which will bail.
1345 error
= sctp_cmd_process_init(commands
, asoc
, chunk
,
1346 cmd
->obj
.init
, gfp
);
1349 case SCTP_CMD_GEN_COOKIE_ECHO
:
1350 /* Generate a COOKIE ECHO chunk. */
1351 new_obj
= sctp_make_cookie_echo(asoc
, chunk
);
1354 sctp_chunk_free(cmd
->obj
.chunk
);
1357 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1358 SCTP_CHUNK(new_obj
));
1360 /* If there is an ERROR chunk to be sent along with
1361 * the COOKIE_ECHO, send it, too.
1364 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1365 SCTP_CHUNK(cmd
->obj
.chunk
));
1367 if (new_obj
->transport
) {
1368 new_obj
->transport
->init_sent_count
++;
1369 asoc
->init_last_sent_to
= new_obj
->transport
;
1372 /* FIXME - Eventually come up with a cleaner way to
1373 * enabling COOKIE-ECHO + DATA bundling during
1374 * multihoming stale cookie scenarios, the following
1375 * command plays with asoc->peer.retran_path to
1376 * avoid the problem of sending the COOKIE-ECHO and
1377 * DATA in different paths, which could result
1378 * in the association being ABORTed if the DATA chunk
1379 * is processed first by the server. Checking the
1380 * init error counter simply causes this command
1381 * to be executed only during failed attempts of
1382 * association establishment.
1384 if ((asoc
->peer
.retran_path
!=
1385 asoc
->peer
.primary_path
) &&
1386 (asoc
->init_err_counter
> 0)) {
1387 sctp_add_cmd_sf(commands
,
1388 SCTP_CMD_FORCE_PRIM_RETRAN
,
1394 case SCTP_CMD_GEN_SHUTDOWN
:
1395 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1396 * Reset error counts.
1398 asoc
->overall_error_count
= 0;
1400 /* Generate a SHUTDOWN chunk. */
1401 new_obj
= sctp_make_shutdown(asoc
, chunk
);
1404 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1405 SCTP_CHUNK(new_obj
));
1408 case SCTP_CMD_CHUNK_ULP
:
1409 /* Send a chunk to the sockets layer. */
1410 pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n",
1411 __func__
, cmd
->obj
.chunk
, &asoc
->ulpq
);
1413 sctp_ulpq_tail_data(&asoc
->ulpq
, cmd
->obj
.chunk
,
1417 case SCTP_CMD_EVENT_ULP
:
1418 /* Send a notification to the sockets layer. */
1419 pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n",
1420 __func__
, cmd
->obj
.ulpevent
, &asoc
->ulpq
);
1422 sctp_ulpq_tail_event(&asoc
->ulpq
, cmd
->obj
.ulpevent
);
1425 case SCTP_CMD_REPLY
:
1426 /* If an caller has not already corked, do cork. */
1427 if (!asoc
->outqueue
.cork
) {
1428 sctp_outq_cork(&asoc
->outqueue
);
1431 /* Send a chunk to our peer. */
1432 error
= sctp_outq_tail(&asoc
->outqueue
, cmd
->obj
.chunk
,
1436 case SCTP_CMD_SEND_PKT
:
1437 /* Send a full packet to our peer. */
1438 packet
= cmd
->obj
.packet
;
1439 sctp_packet_transmit(packet
, gfp
);
1440 sctp_ootb_pkt_free(packet
);
1443 case SCTP_CMD_T1_RETRAN
:
1444 /* Mark a transport for retransmission. */
1445 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1449 case SCTP_CMD_RETRAN
:
1450 /* Mark a transport for retransmission. */
1451 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1455 case SCTP_CMD_ECN_CE
:
1456 /* Do delayed CE processing. */
1457 sctp_do_ecn_ce_work(asoc
, cmd
->obj
.u32
);
1460 case SCTP_CMD_ECN_ECNE
:
1461 /* Do delayed ECNE processing. */
1462 new_obj
= sctp_do_ecn_ecne_work(asoc
, cmd
->obj
.u32
,
1465 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1466 SCTP_CHUNK(new_obj
));
1469 case SCTP_CMD_ECN_CWR
:
1470 /* Do delayed CWR processing. */
1471 sctp_do_ecn_cwr_work(asoc
, cmd
->obj
.u32
);
1474 case SCTP_CMD_SETUP_T2
:
1475 sctp_cmd_setup_t2(commands
, asoc
, cmd
->obj
.chunk
);
1478 case SCTP_CMD_TIMER_START_ONCE
:
1479 timer
= &asoc
->timers
[cmd
->obj
.to
];
1481 if (timer_pending(timer
))
1485 case SCTP_CMD_TIMER_START
:
1486 timer
= &asoc
->timers
[cmd
->obj
.to
];
1487 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1490 timer
->expires
= jiffies
+ timeout
;
1491 sctp_association_hold(asoc
);
1495 case SCTP_CMD_TIMER_RESTART
:
1496 timer
= &asoc
->timers
[cmd
->obj
.to
];
1497 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1498 if (!mod_timer(timer
, jiffies
+ timeout
))
1499 sctp_association_hold(asoc
);
1502 case SCTP_CMD_TIMER_STOP
:
1503 timer
= &asoc
->timers
[cmd
->obj
.to
];
1504 if (del_timer(timer
))
1505 sctp_association_put(asoc
);
1508 case SCTP_CMD_INIT_CHOOSE_TRANSPORT
:
1509 chunk
= cmd
->obj
.chunk
;
1510 t
= sctp_assoc_choose_alter_transport(asoc
,
1511 asoc
->init_last_sent_to
);
1512 asoc
->init_last_sent_to
= t
;
1513 chunk
->transport
= t
;
1514 t
->init_sent_count
++;
1515 /* Set the new transport as primary */
1516 sctp_assoc_set_primary(asoc
, t
);
1519 case SCTP_CMD_INIT_RESTART
:
1520 /* Do the needed accounting and updates
1521 * associated with restarting an initialization
1522 * timer. Only multiply the timeout by two if
1523 * all transports have been tried at the current
1526 sctp_cmd_t1_timer_update(asoc
,
1527 SCTP_EVENT_TIMEOUT_T1_INIT
,
1530 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
1531 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT
));
1534 case SCTP_CMD_COOKIEECHO_RESTART
:
1535 /* Do the needed accounting and updates
1536 * associated with restarting an initialization
1537 * timer. Only multiply the timeout by two if
1538 * all transports have been tried at the current
1541 sctp_cmd_t1_timer_update(asoc
,
1542 SCTP_EVENT_TIMEOUT_T1_COOKIE
,
1545 /* If we've sent any data bundled with
1546 * COOKIE-ECHO we need to resend.
1548 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
1550 sctp_retransmit_mark(&asoc
->outqueue
, t
,
1554 sctp_add_cmd_sf(commands
,
1555 SCTP_CMD_TIMER_RESTART
,
1556 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE
));
1559 case SCTP_CMD_INIT_FAILED
:
1560 sctp_cmd_init_failed(commands
, asoc
, cmd
->obj
.err
);
1563 case SCTP_CMD_ASSOC_FAILED
:
1564 sctp_cmd_assoc_failed(commands
, asoc
, event_type
,
1565 subtype
, chunk
, cmd
->obj
.err
);
1568 case SCTP_CMD_INIT_COUNTER_INC
:
1569 asoc
->init_err_counter
++;
1572 case SCTP_CMD_INIT_COUNTER_RESET
:
1573 asoc
->init_err_counter
= 0;
1574 asoc
->init_cycle
= 0;
1575 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
1577 t
->init_sent_count
= 0;
1581 case SCTP_CMD_REPORT_DUP
:
1582 sctp_tsnmap_mark_dup(&asoc
->peer
.tsn_map
,
1586 case SCTP_CMD_REPORT_BAD_TAG
:
1587 pr_debug("%s: vtag mismatch!\n", __func__
);
1590 case SCTP_CMD_STRIKE
:
1591 /* Mark one strike against a transport. */
1592 sctp_do_8_2_transport_strike(commands
, asoc
,
1593 cmd
->obj
.transport
, 0);
1596 case SCTP_CMD_TRANSPORT_IDLE
:
1597 t
= cmd
->obj
.transport
;
1598 sctp_transport_lower_cwnd(t
, SCTP_LOWER_CWND_INACTIVE
);
1601 case SCTP_CMD_TRANSPORT_HB_SENT
:
1602 t
= cmd
->obj
.transport
;
1603 sctp_do_8_2_transport_strike(commands
, asoc
,
1608 case SCTP_CMD_TRANSPORT_ON
:
1609 t
= cmd
->obj
.transport
;
1610 sctp_cmd_transport_on(commands
, asoc
, t
, chunk
);
1613 case SCTP_CMD_HB_TIMERS_START
:
1614 sctp_cmd_hb_timers_start(commands
, asoc
);
1617 case SCTP_CMD_HB_TIMER_UPDATE
:
1618 t
= cmd
->obj
.transport
;
1619 sctp_cmd_hb_timer_update(commands
, t
);
1622 case SCTP_CMD_HB_TIMERS_STOP
:
1623 sctp_cmd_hb_timers_stop(commands
, asoc
);
1626 case SCTP_CMD_REPORT_ERROR
:
1627 error
= cmd
->obj
.error
;
1630 case SCTP_CMD_PROCESS_CTSN
:
1631 /* Dummy up a SACK for processing. */
1632 sackh
.cum_tsn_ack
= cmd
->obj
.be32
;
1633 sackh
.a_rwnd
= asoc
->peer
.rwnd
+
1634 asoc
->outqueue
.outstanding_bytes
;
1635 sackh
.num_gap_ack_blocks
= 0;
1636 sackh
.num_dup_tsns
= 0;
1637 chunk
->subh
.sack_hdr
= &sackh
;
1638 sctp_add_cmd_sf(commands
, SCTP_CMD_PROCESS_SACK
,
1642 case SCTP_CMD_DISCARD_PACKET
:
1643 /* We need to discard the whole packet.
1644 * Uncork the queue since there might be
1647 chunk
->pdiscard
= 1;
1649 sctp_outq_uncork(&asoc
->outqueue
, gfp
);
1654 case SCTP_CMD_RTO_PENDING
:
1655 t
= cmd
->obj
.transport
;
1659 case SCTP_CMD_PART_DELIVER
:
1660 sctp_ulpq_partial_delivery(&asoc
->ulpq
, GFP_ATOMIC
);
1663 case SCTP_CMD_RENEGE
:
1664 sctp_ulpq_renege(&asoc
->ulpq
, cmd
->obj
.chunk
,
1668 case SCTP_CMD_SETUP_T4
:
1669 sctp_cmd_setup_t4(commands
, asoc
, cmd
->obj
.chunk
);
1672 case SCTP_CMD_PROCESS_OPERR
:
1673 sctp_cmd_process_operr(commands
, asoc
, chunk
);
1675 case SCTP_CMD_CLEAR_INIT_TAG
:
1676 asoc
->peer
.i
.init_tag
= 0;
1678 case SCTP_CMD_DEL_NON_PRIMARY
:
1679 sctp_cmd_del_non_primary(asoc
);
1681 case SCTP_CMD_T3_RTX_TIMERS_STOP
:
1682 sctp_cmd_t3_rtx_timers_stop(commands
, asoc
);
1684 case SCTP_CMD_FORCE_PRIM_RETRAN
:
1685 t
= asoc
->peer
.retran_path
;
1686 asoc
->peer
.retran_path
= asoc
->peer
.primary_path
;
1687 error
= sctp_outq_uncork(&asoc
->outqueue
, gfp
);
1689 asoc
->peer
.retran_path
= t
;
1691 case SCTP_CMD_SET_SK_ERR
:
1692 sctp_cmd_set_sk_err(asoc
, cmd
->obj
.error
);
1694 case SCTP_CMD_ASSOC_CHANGE
:
1695 sctp_cmd_assoc_change(commands
, asoc
,
1698 case SCTP_CMD_ADAPTATION_IND
:
1699 sctp_cmd_adaptation_ind(commands
, asoc
);
1702 case SCTP_CMD_ASSOC_SHKEY
:
1703 error
= sctp_auth_asoc_init_active_key(asoc
,
1706 case SCTP_CMD_UPDATE_INITTAG
:
1707 asoc
->peer
.i
.init_tag
= cmd
->obj
.u32
;
1709 case SCTP_CMD_SEND_MSG
:
1710 if (!asoc
->outqueue
.cork
) {
1711 sctp_outq_cork(&asoc
->outqueue
);
1714 error
= sctp_cmd_send_msg(asoc
, cmd
->obj
.msg
, gfp
);
1716 case SCTP_CMD_SEND_NEXT_ASCONF
:
1717 sctp_cmd_send_asconf(asoc
);
1719 case SCTP_CMD_PURGE_ASCONF_QUEUE
:
1720 sctp_asconf_queue_teardown(asoc
);
1723 case SCTP_CMD_SET_ASOC
:
1724 asoc
= cmd
->obj
.asoc
;
1728 pr_warn("Impossible command: %u\n",
1738 /* If this is in response to a received chunk, wait until
1739 * we are done with the packet to open the queue so that we don't
1740 * send multiple packets in response to a single request.
1742 if (asoc
&& SCTP_EVENT_T_CHUNK
== event_type
&& chunk
) {
1743 if (chunk
->end_of_packet
|| chunk
->singleton
)
1744 error
= sctp_outq_uncork(&asoc
->outqueue
, gfp
);
1745 } else if (local_cork
)
1746 error
= sctp_outq_uncork(&asoc
->outqueue
, gfp
);
1748 if (sp
->pending_data_ready
) {
1749 sk
->sk_data_ready(sk
);
1750 sp
->pending_data_ready
= 0;