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 /********************************************************************
74 ********************************************************************/
76 /* A helper function for delayed processing of INET ECN CE bit. */
77 static void sctp_do_ecn_ce_work(struct sctp_association
*asoc
,
80 /* Save the TSN away for comparison when we receive CWR */
82 asoc
->last_ecne_tsn
= lowest_tsn
;
86 /* Helper function for delayed processing of SCTP ECNE chunk. */
87 /* RFC 2960 Appendix A
89 * RFC 2481 details a specific bit for a sender to send in
90 * the header of its next outbound TCP segment to indicate to
91 * its peer that it has reduced its congestion window. This
92 * is termed the CWR bit. For SCTP the same indication is made
93 * by including the CWR chunk. This chunk contains one data
94 * element, i.e. the TSN number that was sent in the ECNE chunk.
95 * This element represents the lowest TSN number in the datagram
96 * that was originally marked with the CE bit.
98 static struct sctp_chunk
*sctp_do_ecn_ecne_work(struct sctp_association
*asoc
,
100 struct sctp_chunk
*chunk
)
102 struct sctp_chunk
*repl
;
104 /* Our previously transmitted packet ran into some congestion
105 * so we should take action by reducing cwnd and ssthresh
106 * and then ACK our peer that we we've done so by
110 /* First, try to determine if we want to actually lower
111 * our cwnd variables. Only lower them if the ECNE looks more
112 * recent than the last response.
114 if (TSN_lt(asoc
->last_cwr_tsn
, lowest_tsn
)) {
115 struct sctp_transport
*transport
;
117 /* Find which transport's congestion variables
118 * need to be adjusted.
120 transport
= sctp_assoc_lookup_tsn(asoc
, lowest_tsn
);
122 /* Update the congestion variables. */
124 sctp_transport_lower_cwnd(transport
,
125 SCTP_LOWER_CWND_ECNE
);
126 asoc
->last_cwr_tsn
= lowest_tsn
;
129 /* Always try to quiet the other end. In case of lost CWR,
130 * resend last_cwr_tsn.
132 repl
= sctp_make_cwr(asoc
, asoc
->last_cwr_tsn
, chunk
);
134 /* If we run out of memory, it will look like a lost CWR. We'll
135 * get back in sync eventually.
140 /* Helper function to do delayed processing of ECN CWR chunk. */
141 static void sctp_do_ecn_cwr_work(struct sctp_association
*asoc
,
144 /* Turn off ECNE getting auto-prepended to every outgoing
150 /* Generate SACK if necessary. We call this at the end of a packet. */
151 static int sctp_gen_sack(struct sctp_association
*asoc
, int force
,
152 sctp_cmd_seq_t
*commands
)
154 __u32 ctsn
, max_tsn_seen
;
155 struct sctp_chunk
*sack
;
156 struct sctp_transport
*trans
= asoc
->peer
.last_data_from
;
160 (!trans
&& (asoc
->param_flags
& SPP_SACKDELAY_DISABLE
)) ||
161 (trans
&& (trans
->param_flags
& SPP_SACKDELAY_DISABLE
)))
162 asoc
->peer
.sack_needed
= 1;
164 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
165 max_tsn_seen
= sctp_tsnmap_get_max_tsn_seen(&asoc
->peer
.tsn_map
);
167 /* From 12.2 Parameters necessary per association (i.e. the TCB):
169 * Ack State : This flag indicates if the next received packet
170 * : is to be responded to with a SACK. ...
171 * : When DATA chunks are out of order, SACK's
172 * : are not delayed (see Section 6).
174 * [This is actually not mentioned in Section 6, but we
175 * implement it here anyway. --piggy]
177 if (max_tsn_seen
!= ctsn
)
178 asoc
->peer
.sack_needed
= 1;
180 /* From 6.2 Acknowledgement on Reception of DATA Chunks:
182 * Section 4.2 of [RFC2581] SHOULD be followed. Specifically,
183 * an acknowledgement SHOULD be generated for at least every
184 * second packet (not every second DATA chunk) received, and
185 * SHOULD be generated within 200 ms of the arrival of any
186 * unacknowledged DATA chunk. ...
188 if (!asoc
->peer
.sack_needed
) {
189 asoc
->peer
.sack_cnt
++;
191 /* Set the SACK delay timeout based on the
192 * SACK delay for the last transport
193 * data was received from, or the default
194 * for the association.
197 /* We will need a SACK for the next packet. */
198 if (asoc
->peer
.sack_cnt
>= trans
->sackfreq
- 1)
199 asoc
->peer
.sack_needed
= 1;
201 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
204 /* We will need a SACK for the next packet. */
205 if (asoc
->peer
.sack_cnt
>= asoc
->sackfreq
- 1)
206 asoc
->peer
.sack_needed
= 1;
208 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
212 /* Restart the SACK timer. */
213 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
214 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
216 __u32 old_a_rwnd
= asoc
->a_rwnd
;
218 asoc
->a_rwnd
= asoc
->rwnd
;
219 sack
= sctp_make_sack(asoc
);
221 asoc
->a_rwnd
= old_a_rwnd
;
225 asoc
->peer
.sack_needed
= 0;
226 asoc
->peer
.sack_cnt
= 0;
228 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
, SCTP_CHUNK(sack
));
230 /* Stop the SACK timer. */
231 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_STOP
,
232 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
241 /* When the T3-RTX timer expires, it calls this function to create the
242 * relevant state machine event.
244 void sctp_generate_t3_rtx_event(unsigned long peer
)
247 struct sctp_transport
*transport
= (struct sctp_transport
*) peer
;
248 struct sctp_association
*asoc
= transport
->asoc
;
249 struct sock
*sk
= asoc
->base
.sk
;
250 struct net
*net
= sock_net(sk
);
252 /* Check whether a task is in the sock. */
255 if (sock_owned_by_user(sk
)) {
256 pr_debug("%s: sock is busy\n", __func__
);
258 /* Try again later. */
259 if (!mod_timer(&transport
->T3_rtx_timer
, jiffies
+ (HZ
/20)))
260 sctp_transport_hold(transport
);
264 /* Run through the state machine. */
265 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
266 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX
),
269 transport
, GFP_ATOMIC
);
276 sctp_transport_put(transport
);
279 /* This is a sa interface for producing timeout events. It works
280 * for timeouts which use the association as their parameter.
282 static void sctp_generate_timeout_event(struct sctp_association
*asoc
,
283 sctp_event_timeout_t timeout_type
)
285 struct sock
*sk
= asoc
->base
.sk
;
286 struct net
*net
= sock_net(sk
);
290 if (sock_owned_by_user(sk
)) {
291 pr_debug("%s: sock is busy: timer %d\n", __func__
,
294 /* Try again later. */
295 if (!mod_timer(&asoc
->timers
[timeout_type
], jiffies
+ (HZ
/20)))
296 sctp_association_hold(asoc
);
300 /* Is this association really dead and just waiting around for
301 * the timer to let go of the reference?
306 /* Run through the state machine. */
307 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
308 SCTP_ST_TIMEOUT(timeout_type
),
309 asoc
->state
, asoc
->ep
, asoc
,
310 (void *)timeout_type
, GFP_ATOMIC
);
317 sctp_association_put(asoc
);
320 static void sctp_generate_t1_cookie_event(unsigned long data
)
322 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
323 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_COOKIE
);
326 static void sctp_generate_t1_init_event(unsigned long data
)
328 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
329 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_INIT
);
332 static void sctp_generate_t2_shutdown_event(unsigned long data
)
334 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
335 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
);
338 static void sctp_generate_t4_rto_event(unsigned long data
)
340 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
341 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T4_RTO
);
344 static void sctp_generate_t5_shutdown_guard_event(unsigned long data
)
346 struct sctp_association
*asoc
= (struct sctp_association
*)data
;
347 sctp_generate_timeout_event(asoc
,
348 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD
);
350 } /* sctp_generate_t5_shutdown_guard_event() */
352 static void sctp_generate_autoclose_event(unsigned long data
)
354 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
355 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_AUTOCLOSE
);
358 /* Generate a heart beat event. If the sock is busy, reschedule. Make
359 * sure that the transport is still valid.
361 void sctp_generate_heartbeat_event(unsigned long data
)
364 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
365 struct sctp_association
*asoc
= transport
->asoc
;
366 struct sock
*sk
= asoc
->base
.sk
;
367 struct net
*net
= sock_net(sk
);
368 u32 elapsed
, timeout
;
371 if (sock_owned_by_user(sk
)) {
372 pr_debug("%s: sock is busy\n", __func__
);
374 /* Try again later. */
375 if (!mod_timer(&transport
->hb_timer
, jiffies
+ (HZ
/20)))
376 sctp_transport_hold(transport
);
380 /* Check if we should still send the heartbeat or reschedule */
381 elapsed
= jiffies
- transport
->last_time_sent
;
382 timeout
= sctp_transport_timeout(transport
);
383 if (elapsed
< timeout
) {
384 elapsed
= timeout
- elapsed
;
385 if (!mod_timer(&transport
->hb_timer
, jiffies
+ elapsed
))
386 sctp_transport_hold(transport
);
390 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
391 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT
),
392 asoc
->state
, asoc
->ep
, asoc
,
393 transport
, GFP_ATOMIC
);
400 sctp_transport_put(transport
);
403 /* Handle the timeout of the ICMP protocol unreachable timer. Trigger
404 * the correct state machine transition that will close the association.
406 void sctp_generate_proto_unreach_event(unsigned long data
)
408 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
409 struct sctp_association
*asoc
= transport
->asoc
;
410 struct sock
*sk
= asoc
->base
.sk
;
411 struct net
*net
= sock_net(sk
);
414 if (sock_owned_by_user(sk
)) {
415 pr_debug("%s: sock is busy\n", __func__
);
417 /* Try again later. */
418 if (!mod_timer(&transport
->proto_unreach_timer
,
420 sctp_association_hold(asoc
);
424 /* Is this structure just waiting around for us to actually
430 sctp_do_sm(net
, SCTP_EVENT_T_OTHER
,
431 SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH
),
432 asoc
->state
, asoc
->ep
, asoc
, transport
, GFP_ATOMIC
);
436 sctp_association_put(asoc
);
439 /* Handle the timeout of the RE-CONFIG timer. */
440 void sctp_generate_reconf_event(unsigned long data
)
442 struct sctp_transport
*transport
= (struct sctp_transport
*)data
;
443 struct sctp_association
*asoc
= transport
->asoc
;
444 struct sock
*sk
= asoc
->base
.sk
;
445 struct net
*net
= sock_net(sk
);
449 if (sock_owned_by_user(sk
)) {
450 pr_debug("%s: sock is busy\n", __func__
);
452 /* Try again later. */
453 if (!mod_timer(&transport
->reconf_timer
, jiffies
+ (HZ
/ 20)))
454 sctp_transport_hold(transport
);
458 error
= sctp_do_sm(net
, SCTP_EVENT_T_TIMEOUT
,
459 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_RECONF
),
460 asoc
->state
, asoc
->ep
, asoc
,
461 transport
, GFP_ATOMIC
);
468 sctp_transport_put(transport
);
471 /* Inject a SACK Timeout event into the state machine. */
472 static void sctp_generate_sack_event(unsigned long data
)
474 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
475 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_SACK
);
478 sctp_timer_event_t
*sctp_timer_events
[SCTP_NUM_TIMEOUT_TYPES
] = {
480 sctp_generate_t1_cookie_event
,
481 sctp_generate_t1_init_event
,
482 sctp_generate_t2_shutdown_event
,
484 sctp_generate_t4_rto_event
,
485 sctp_generate_t5_shutdown_guard_event
,
488 sctp_generate_sack_event
,
489 sctp_generate_autoclose_event
,
493 /* RFC 2960 8.2 Path Failure Detection
495 * When its peer endpoint is multi-homed, an endpoint should keep a
496 * error counter for each of the destination transport addresses of the
499 * Each time the T3-rtx timer expires on any address, or when a
500 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
501 * the error counter of that destination address will be incremented.
502 * When the value in the error counter exceeds the protocol parameter
503 * 'Path.Max.Retrans' of that destination address, the endpoint should
504 * mark the destination transport address as inactive, and a
505 * notification SHOULD be sent to the upper layer.
508 static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t
*commands
,
509 struct sctp_association
*asoc
,
510 struct sctp_transport
*transport
,
513 struct net
*net
= sock_net(asoc
->base
.sk
);
515 /* The check for association's overall error counter exceeding the
516 * threshold is done in the state function.
518 /* We are here due to a timer expiration. If the timer was
519 * not a HEARTBEAT, then normal error tracking is done.
520 * If the timer was a heartbeat, we only increment error counts
521 * when we already have an outstanding HEARTBEAT that has not
523 * Additionally, some tranport states inhibit error increments.
526 asoc
->overall_error_count
++;
527 if (transport
->state
!= SCTP_INACTIVE
)
528 transport
->error_count
++;
529 } else if (transport
->hb_sent
) {
530 if (transport
->state
!= SCTP_UNCONFIRMED
)
531 asoc
->overall_error_count
++;
532 if (transport
->state
!= SCTP_INACTIVE
)
533 transport
->error_count
++;
536 /* If the transport error count is greater than the pf_retrans
537 * threshold, and less than pathmaxrtx, and if the current state
538 * is SCTP_ACTIVE, then mark this transport as Partially Failed,
539 * see SCTP Quick Failover Draft, section 5.1
541 if (net
->sctp
.pf_enable
&&
542 (transport
->state
== SCTP_ACTIVE
) &&
543 (asoc
->pf_retrans
< transport
->pathmaxrxt
) &&
544 (transport
->error_count
> asoc
->pf_retrans
)) {
546 sctp_assoc_control_transport(asoc
, transport
,
550 /* Update the hb timer to resend a heartbeat every rto */
551 sctp_transport_reset_hb_timer(transport
);
554 if (transport
->state
!= SCTP_INACTIVE
&&
555 (transport
->error_count
> transport
->pathmaxrxt
)) {
556 pr_debug("%s: association:%p transport addr:%pISpc failed\n",
557 __func__
, asoc
, &transport
->ipaddr
.sa
);
559 sctp_assoc_control_transport(asoc
, transport
,
561 SCTP_FAILED_THRESHOLD
);
564 /* E2) For the destination address for which the timer
565 * expires, set RTO <- RTO * 2 ("back off the timer"). The
566 * maximum value discussed in rule C7 above (RTO.max) may be
567 * used to provide an upper bound to this doubling operation.
569 * Special Case: the first HB doesn't trigger exponential backoff.
570 * The first unacknowledged HB triggers it. We do this with a flag
571 * that indicates that we have an outstanding HB.
573 if (!is_hb
|| transport
->hb_sent
) {
574 transport
->rto
= min((transport
->rto
* 2), transport
->asoc
->rto_max
);
575 sctp_max_rto(asoc
, transport
);
579 /* Worker routine to handle INIT command failure. */
580 static void sctp_cmd_init_failed(sctp_cmd_seq_t
*commands
,
581 struct sctp_association
*asoc
,
584 struct sctp_ulpevent
*event
;
586 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_CANT_STR_ASSOC
,
587 (__u16
)error
, 0, 0, NULL
,
591 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
592 SCTP_ULPEVENT(event
));
594 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
595 SCTP_STATE(SCTP_STATE_CLOSED
));
597 /* SEND_FAILED sent later when cleaning up the association. */
598 asoc
->outqueue
.error
= error
;
599 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
602 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
603 static void sctp_cmd_assoc_failed(sctp_cmd_seq_t
*commands
,
604 struct sctp_association
*asoc
,
605 sctp_event_t event_type
,
606 sctp_subtype_t subtype
,
607 struct sctp_chunk
*chunk
,
610 struct sctp_ulpevent
*event
;
611 struct sctp_chunk
*abort
;
612 /* Cancel any partial delivery in progress. */
613 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
615 if (event_type
== SCTP_EVENT_T_CHUNK
&& subtype
.chunk
== SCTP_CID_ABORT
)
616 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
617 (__u16
)error
, 0, 0, chunk
,
620 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
621 (__u16
)error
, 0, 0, NULL
,
624 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
625 SCTP_ULPEVENT(event
));
627 if (asoc
->overall_error_count
>= asoc
->max_retrans
) {
628 abort
= sctp_make_violation_max_retrans(asoc
, chunk
);
630 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
634 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
635 SCTP_STATE(SCTP_STATE_CLOSED
));
637 /* SEND_FAILED sent later when cleaning up the association. */
638 asoc
->outqueue
.error
= error
;
639 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
642 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
643 * inside the cookie. In reality, this is only used for INIT-ACK processing
644 * since all other cases use "temporary" associations and can do all
645 * their work in statefuns directly.
647 static int sctp_cmd_process_init(sctp_cmd_seq_t
*commands
,
648 struct sctp_association
*asoc
,
649 struct sctp_chunk
*chunk
,
650 sctp_init_chunk_t
*peer_init
,
655 /* We only process the init as a sideeffect in a single
656 * case. This is when we process the INIT-ACK. If we
657 * fail during INIT processing (due to malloc problems),
658 * just return the error and stop processing the stack.
660 if (!sctp_process_init(asoc
, chunk
, sctp_source(chunk
), peer_init
, gfp
))
668 /* Helper function to break out starting up of heartbeat timers. */
669 static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t
*cmds
,
670 struct sctp_association
*asoc
)
672 struct sctp_transport
*t
;
674 /* Start a heartbeat timer for each transport on the association.
675 * hold a reference on the transport to make sure none of
676 * the needed data structures go away.
678 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
, transports
)
679 sctp_transport_reset_hb_timer(t
);
682 static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t
*cmds
,
683 struct sctp_association
*asoc
)
685 struct sctp_transport
*t
;
687 /* Stop all heartbeat timers. */
689 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
691 if (del_timer(&t
->hb_timer
))
692 sctp_transport_put(t
);
696 /* Helper function to stop any pending T3-RTX timers */
697 static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t
*cmds
,
698 struct sctp_association
*asoc
)
700 struct sctp_transport
*t
;
702 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
704 if (del_timer(&t
->T3_rtx_timer
))
705 sctp_transport_put(t
);
710 /* Helper function to handle the reception of an HEARTBEAT ACK. */
711 static void sctp_cmd_transport_on(sctp_cmd_seq_t
*cmds
,
712 struct sctp_association
*asoc
,
713 struct sctp_transport
*t
,
714 struct sctp_chunk
*chunk
)
716 sctp_sender_hb_info_t
*hbinfo
;
717 int was_unconfirmed
= 0;
719 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
720 * HEARTBEAT should clear the error counter of the destination
721 * transport address to which the HEARTBEAT was sent.
726 * Although RFC4960 specifies that the overall error count must
727 * be cleared when a HEARTBEAT ACK is received, we make an
728 * exception while in SHUTDOWN PENDING. If the peer keeps its
729 * window shut forever, we may never be able to transmit our
730 * outstanding data and rely on the retransmission limit be reached
731 * to shutdown the association.
733 if (t
->asoc
->state
< SCTP_STATE_SHUTDOWN_PENDING
)
734 t
->asoc
->overall_error_count
= 0;
736 /* Clear the hb_sent flag to signal that we had a good
741 /* Mark the destination transport address as active if it is not so
744 if ((t
->state
== SCTP_INACTIVE
) || (t
->state
== SCTP_UNCONFIRMED
)) {
746 sctp_assoc_control_transport(asoc
, t
, SCTP_TRANSPORT_UP
,
747 SCTP_HEARTBEAT_SUCCESS
);
750 if (t
->state
== SCTP_PF
)
751 sctp_assoc_control_transport(asoc
, t
, SCTP_TRANSPORT_UP
,
752 SCTP_HEARTBEAT_SUCCESS
);
754 /* HB-ACK was received for a the proper HB. Consider this
758 sctp_transport_dst_confirm(t
);
760 /* The receiver of the HEARTBEAT ACK should also perform an
761 * RTT measurement for that destination transport address
762 * using the time value carried in the HEARTBEAT ACK chunk.
763 * If the transport's rto_pending variable has been cleared,
764 * it was most likely due to a retransmit. However, we want
765 * to re-enable it to properly update the rto.
767 if (t
->rto_pending
== 0)
770 hbinfo
= (sctp_sender_hb_info_t
*) chunk
->skb
->data
;
771 sctp_transport_update_rto(t
, (jiffies
- hbinfo
->sent_at
));
773 /* Update the heartbeat timer. */
774 sctp_transport_reset_hb_timer(t
);
776 if (was_unconfirmed
&& asoc
->peer
.transport_count
== 1)
777 sctp_transport_immediate_rtx(t
);
781 /* Helper function to process the process SACK command. */
782 static int sctp_cmd_process_sack(sctp_cmd_seq_t
*cmds
,
783 struct sctp_association
*asoc
,
784 struct sctp_chunk
*chunk
)
788 if (sctp_outq_sack(&asoc
->outqueue
, chunk
)) {
789 struct net
*net
= sock_net(asoc
->base
.sk
);
791 /* There are no more TSNs awaiting SACK. */
792 err
= sctp_do_sm(net
, SCTP_EVENT_T_OTHER
,
793 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN
),
794 asoc
->state
, asoc
->ep
, asoc
, NULL
,
801 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
802 * the transport for a shutdown chunk.
804 static void sctp_cmd_setup_t2(sctp_cmd_seq_t
*cmds
,
805 struct sctp_association
*asoc
,
806 struct sctp_chunk
*chunk
)
808 struct sctp_transport
*t
;
810 if (chunk
->transport
)
811 t
= chunk
->transport
;
813 t
= sctp_assoc_choose_alter_transport(asoc
,
814 asoc
->shutdown_last_sent_to
);
815 chunk
->transport
= t
;
817 asoc
->shutdown_last_sent_to
= t
;
818 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
] = t
->rto
;
821 static void sctp_cmd_assoc_update(sctp_cmd_seq_t
*cmds
,
822 struct sctp_association
*asoc
,
823 struct sctp_association
*new)
825 struct net
*net
= sock_net(asoc
->base
.sk
);
826 struct sctp_chunk
*abort
;
828 if (!sctp_assoc_update(asoc
, new))
831 abort
= sctp_make_abort(asoc
, NULL
, sizeof(sctp_errhdr_t
));
833 sctp_init_cause(abort
, SCTP_ERROR_RSRC_LOW
, 0);
834 sctp_add_cmd_sf(cmds
, SCTP_CMD_REPLY
, SCTP_CHUNK(abort
));
836 sctp_add_cmd_sf(cmds
, SCTP_CMD_SET_SK_ERR
, SCTP_ERROR(ECONNABORTED
));
837 sctp_add_cmd_sf(cmds
, SCTP_CMD_ASSOC_FAILED
,
838 SCTP_PERR(SCTP_ERROR_RSRC_LOW
));
839 SCTP_INC_STATS(net
, SCTP_MIB_ABORTEDS
);
840 SCTP_DEC_STATS(net
, SCTP_MIB_CURRESTAB
);
843 /* Helper function to change the state of an association. */
844 static void sctp_cmd_new_state(sctp_cmd_seq_t
*cmds
,
845 struct sctp_association
*asoc
,
848 struct sock
*sk
= asoc
->base
.sk
;
852 pr_debug("%s: asoc:%p[%s]\n", __func__
, asoc
, sctp_state_tbl
[state
]);
854 if (sctp_style(sk
, TCP
)) {
855 /* Change the sk->sk_state of a TCP-style socket that has
856 * successfully completed a connect() call.
858 if (sctp_state(asoc
, ESTABLISHED
) && sctp_sstate(sk
, CLOSED
))
859 sk
->sk_state
= SCTP_SS_ESTABLISHED
;
861 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
862 if (sctp_state(asoc
, SHUTDOWN_RECEIVED
) &&
863 sctp_sstate(sk
, ESTABLISHED
)) {
864 sk
->sk_state
= SCTP_SS_CLOSING
;
865 sk
->sk_shutdown
|= RCV_SHUTDOWN
;
869 if (sctp_state(asoc
, COOKIE_WAIT
)) {
870 /* Reset init timeouts since they may have been
871 * increased due to timer expirations.
873 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] =
875 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] =
879 if (sctp_state(asoc
, ESTABLISHED
) ||
880 sctp_state(asoc
, CLOSED
) ||
881 sctp_state(asoc
, SHUTDOWN_RECEIVED
)) {
882 /* Wake up any processes waiting in the asoc's wait queue in
883 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
885 if (waitqueue_active(&asoc
->wait
))
886 wake_up_interruptible(&asoc
->wait
);
888 /* Wake up any processes waiting in the sk's sleep queue of
889 * a TCP-style or UDP-style peeled-off socket in
890 * sctp_wait_for_accept() or sctp_wait_for_packet().
891 * For a UDP-style socket, the waiters are woken up by the
894 if (!sctp_style(sk
, UDP
))
895 sk
->sk_state_change(sk
);
898 if (sctp_state(asoc
, SHUTDOWN_PENDING
) &&
899 !sctp_outq_is_empty(&asoc
->outqueue
))
900 sctp_outq_uncork(&asoc
->outqueue
, GFP_ATOMIC
);
903 /* Helper function to delete an association. */
904 static void sctp_cmd_delete_tcb(sctp_cmd_seq_t
*cmds
,
905 struct sctp_association
*asoc
)
907 struct sock
*sk
= asoc
->base
.sk
;
909 /* If it is a non-temporary association belonging to a TCP-style
910 * listening socket that is not closed, do not free it so that accept()
911 * can pick it up later.
913 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
) &&
914 (!asoc
->temp
) && (sk
->sk_shutdown
!= SHUTDOWN_MASK
))
917 sctp_association_free(asoc
);
921 * ADDIP Section 4.1 ASCONF Chunk Procedures
922 * A4) Start a T-4 RTO timer, using the RTO value of the selected
923 * destination address (we use active path instead of primary path just
924 * because primary path may be inactive.
926 static void sctp_cmd_setup_t4(sctp_cmd_seq_t
*cmds
,
927 struct sctp_association
*asoc
,
928 struct sctp_chunk
*chunk
)
930 struct sctp_transport
*t
;
932 t
= sctp_assoc_choose_alter_transport(asoc
, chunk
->transport
);
933 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T4_RTO
] = t
->rto
;
934 chunk
->transport
= t
;
937 /* Process an incoming Operation Error Chunk. */
938 static void sctp_cmd_process_operr(sctp_cmd_seq_t
*cmds
,
939 struct sctp_association
*asoc
,
940 struct sctp_chunk
*chunk
)
942 struct sctp_errhdr
*err_hdr
;
943 struct sctp_ulpevent
*ev
;
945 while (chunk
->chunk_end
> chunk
->skb
->data
) {
946 err_hdr
= (struct sctp_errhdr
*)(chunk
->skb
->data
);
948 ev
= sctp_ulpevent_make_remote_error(asoc
, chunk
, 0,
953 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
955 switch (err_hdr
->cause
) {
956 case SCTP_ERROR_UNKNOWN_CHUNK
:
958 sctp_chunkhdr_t
*unk_chunk_hdr
;
960 unk_chunk_hdr
= (sctp_chunkhdr_t
*)err_hdr
->variable
;
961 switch (unk_chunk_hdr
->type
) {
962 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with
963 * an ERROR chunk reporting that it did not recognized
964 * the ASCONF chunk type, the sender of the ASCONF MUST
965 * NOT send any further ASCONF chunks and MUST stop its
968 case SCTP_CID_ASCONF
:
969 if (asoc
->peer
.asconf_capable
== 0)
972 asoc
->peer
.asconf_capable
= 0;
973 sctp_add_cmd_sf(cmds
, SCTP_CMD_TIMER_STOP
,
974 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO
));
987 /* Process variable FWDTSN chunk information. */
988 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq
*ulpq
,
989 struct sctp_chunk
*chunk
)
991 struct sctp_fwdtsn_skip
*skip
;
992 /* Walk through all the skipped SSNs */
993 sctp_walk_fwdtsn(skip
, chunk
) {
994 sctp_ulpq_skip(ulpq
, ntohs(skip
->stream
), ntohs(skip
->ssn
));
998 /* Helper function to remove the association non-primary peer
1001 static void sctp_cmd_del_non_primary(struct sctp_association
*asoc
)
1003 struct sctp_transport
*t
;
1004 struct list_head
*pos
;
1005 struct list_head
*temp
;
1007 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
1008 t
= list_entry(pos
, struct sctp_transport
, transports
);
1009 if (!sctp_cmp_addr_exact(&t
->ipaddr
,
1010 &asoc
->peer
.primary_addr
)) {
1011 sctp_assoc_rm_peer(asoc
, t
);
1016 /* Helper function to set sk_err on a 1-1 style socket. */
1017 static void sctp_cmd_set_sk_err(struct sctp_association
*asoc
, int error
)
1019 struct sock
*sk
= asoc
->base
.sk
;
1021 if (!sctp_style(sk
, UDP
))
1025 /* Helper function to generate an association change event */
1026 static void sctp_cmd_assoc_change(sctp_cmd_seq_t
*commands
,
1027 struct sctp_association
*asoc
,
1030 struct sctp_ulpevent
*ev
;
1032 ev
= sctp_ulpevent_make_assoc_change(asoc
, 0, state
, 0,
1033 asoc
->c
.sinit_num_ostreams
,
1034 asoc
->c
.sinit_max_instreams
,
1037 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
1040 /* Helper function to generate an adaptation indication event */
1041 static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t
*commands
,
1042 struct sctp_association
*asoc
)
1044 struct sctp_ulpevent
*ev
;
1046 ev
= sctp_ulpevent_make_adaptation_indication(asoc
, GFP_ATOMIC
);
1049 sctp_ulpq_tail_event(&asoc
->ulpq
, ev
);
1053 static void sctp_cmd_t1_timer_update(struct sctp_association
*asoc
,
1054 sctp_event_timeout_t timer
,
1057 struct sctp_transport
*t
;
1059 t
= asoc
->init_last_sent_to
;
1060 asoc
->init_err_counter
++;
1062 if (t
->init_sent_count
> (asoc
->init_cycle
+ 1)) {
1063 asoc
->timeouts
[timer
] *= 2;
1064 if (asoc
->timeouts
[timer
] > asoc
->max_init_timeo
) {
1065 asoc
->timeouts
[timer
] = asoc
->max_init_timeo
;
1069 pr_debug("%s: T1[%s] timeout adjustment init_err_counter:%d"
1070 " cycle:%d timeout:%ld\n", __func__
, name
,
1071 asoc
->init_err_counter
, asoc
->init_cycle
,
1072 asoc
->timeouts
[timer
]);
1077 /* Send the whole message, chunk by chunk, to the outqueue.
1078 * This way the whole message is queued up and bundling if
1079 * encouraged for small fragments.
1081 static void sctp_cmd_send_msg(struct sctp_association
*asoc
,
1082 struct sctp_datamsg
*msg
, gfp_t gfp
)
1084 struct sctp_chunk
*chunk
;
1086 list_for_each_entry(chunk
, &msg
->chunks
, frag_list
)
1087 sctp_outq_tail(&asoc
->outqueue
, chunk
, gfp
);
1091 /* Sent the next ASCONF packet currently stored in the association.
1092 * This happens after the ASCONF_ACK was succeffully processed.
1094 static void sctp_cmd_send_asconf(struct sctp_association
*asoc
)
1096 struct net
*net
= sock_net(asoc
->base
.sk
);
1098 /* Send the next asconf chunk from the addip chunk
1101 if (!list_empty(&asoc
->addip_chunk_list
)) {
1102 struct list_head
*entry
= asoc
->addip_chunk_list
.next
;
1103 struct sctp_chunk
*asconf
= list_entry(entry
,
1104 struct sctp_chunk
, list
);
1105 list_del_init(entry
);
1107 /* Hold the chunk until an ASCONF_ACK is received. */
1108 sctp_chunk_hold(asconf
);
1109 if (sctp_primitive_ASCONF(net
, asoc
, asconf
))
1110 sctp_chunk_free(asconf
);
1112 asoc
->addip_last_asconf
= asconf
;
1117 /* These three macros allow us to pull the debugging code out of the
1118 * main flow of sctp_do_sm() to keep attention focused on the real
1119 * functionality there.
1121 #define debug_pre_sfn() \
1122 pr_debug("%s[pre-fn]: ep:%p, %s, %s, asoc:%p[%s], %s\n", __func__, \
1123 ep, sctp_evttype_tbl[event_type], (*debug_fn)(subtype), \
1124 asoc, sctp_state_tbl[state], state_fn->name)
1126 #define debug_post_sfn() \
1127 pr_debug("%s[post-fn]: asoc:%p, status:%s\n", __func__, asoc, \
1128 sctp_status_tbl[status])
1130 #define debug_post_sfx() \
1131 pr_debug("%s[post-sfx]: error:%d, asoc:%p[%s]\n", __func__, error, \
1132 asoc, sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
1133 sctp_assoc2id(asoc))) ? asoc->state : SCTP_STATE_CLOSED])
1136 * This is the master state machine processing function.
1138 * If you want to understand all of lksctp, this is a
1139 * good place to start.
1141 int sctp_do_sm(struct net
*net
, sctp_event_t event_type
, sctp_subtype_t subtype
,
1143 struct sctp_endpoint
*ep
,
1144 struct sctp_association
*asoc
,
1148 sctp_cmd_seq_t commands
;
1149 const sctp_sm_table_entry_t
*state_fn
;
1150 sctp_disposition_t status
;
1152 typedef const char *(printfn_t
)(sctp_subtype_t
);
1153 static printfn_t
*table
[] = {
1154 NULL
, sctp_cname
, sctp_tname
, sctp_oname
, sctp_pname
,
1156 printfn_t
*debug_fn
__attribute__ ((unused
)) = table
[event_type
];
1158 /* Look up the state function, run it, and then process the
1159 * side effects. These three steps are the heart of lksctp.
1161 state_fn
= sctp_sm_lookup_event(net
, event_type
, state
, subtype
);
1163 sctp_init_cmd_seq(&commands
);
1166 status
= state_fn
->fn(net
, ep
, asoc
, subtype
, event_arg
, &commands
);
1169 error
= sctp_side_effects(event_type
, subtype
, state
,
1170 ep
, &asoc
, event_arg
, status
,
1177 /*****************************************************************
1178 * This the master state function side effect processing function.
1179 *****************************************************************/
1180 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
1182 struct sctp_endpoint
*ep
,
1183 struct sctp_association
**asoc
,
1185 sctp_disposition_t status
,
1186 sctp_cmd_seq_t
*commands
,
1191 /* FIXME - Most of the dispositions left today would be categorized
1192 * as "exceptional" dispositions. For those dispositions, it
1193 * may not be proper to run through any of the commands at all.
1194 * For example, the command interpreter might be run only with
1195 * disposition SCTP_DISPOSITION_CONSUME.
1197 if (0 != (error
= sctp_cmd_interpreter(event_type
, subtype
, state
,
1204 case SCTP_DISPOSITION_DISCARD
:
1205 pr_debug("%s: ignored sctp protocol event - state:%d, "
1206 "event_type:%d, event_id:%d\n", __func__
, state
,
1207 event_type
, subtype
.chunk
);
1210 case SCTP_DISPOSITION_NOMEM
:
1211 /* We ran out of memory, so we need to discard this
1214 /* BUG--we should now recover some memory, probably by
1220 case SCTP_DISPOSITION_DELETE_TCB
:
1221 case SCTP_DISPOSITION_ABORT
:
1222 /* This should now be a command. */
1226 case SCTP_DISPOSITION_CONSUME
:
1228 * We should no longer have much work to do here as the
1229 * real work has been done as explicit commands above.
1233 case SCTP_DISPOSITION_VIOLATION
:
1234 net_err_ratelimited("protocol violation state %d chunkid %d\n",
1235 state
, subtype
.chunk
);
1238 case SCTP_DISPOSITION_NOT_IMPL
:
1239 pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n",
1240 state
, event_type
, subtype
.chunk
);
1243 case SCTP_DISPOSITION_BUG
:
1244 pr_err("bug in state %d, event_type %d, event_id %d\n",
1245 state
, event_type
, subtype
.chunk
);
1250 pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n",
1251 status
, state
, event_type
, subtype
.chunk
);
1260 /********************************************************************
1261 * 2nd Level Abstractions
1262 ********************************************************************/
1264 /* This is the side-effect interpreter. */
1265 static int sctp_cmd_interpreter(sctp_event_t event_type
,
1266 sctp_subtype_t subtype
,
1268 struct sctp_endpoint
*ep
,
1269 struct sctp_association
*asoc
,
1271 sctp_disposition_t status
,
1272 sctp_cmd_seq_t
*commands
,
1275 struct sock
*sk
= ep
->base
.sk
;
1276 struct sctp_sock
*sp
= sctp_sk(sk
);
1280 struct sctp_chunk
*new_obj
;
1281 struct sctp_chunk
*chunk
= NULL
;
1282 struct sctp_packet
*packet
;
1283 struct timer_list
*timer
;
1284 unsigned long timeout
;
1285 struct sctp_transport
*t
;
1286 struct sctp_sackhdr sackh
;
1289 if (SCTP_EVENT_T_TIMEOUT
!= event_type
)
1292 /* Note: This whole file is a huge candidate for rework.
1293 * For example, each command could either have its own handler, so
1294 * the loop would look like:
1296 * cmd->handle(x, y, z)
1299 while (NULL
!= (cmd
= sctp_next_cmd(commands
))) {
1300 switch (cmd
->verb
) {
1305 case SCTP_CMD_NEW_ASOC
:
1306 /* Register a new association. */
1308 sctp_outq_uncork(&asoc
->outqueue
, gfp
);
1312 /* Register with the endpoint. */
1313 asoc
= cmd
->obj
.asoc
;
1314 BUG_ON(asoc
->peer
.primary_path
== NULL
);
1315 sctp_endpoint_add_asoc(ep
, asoc
);
1318 case SCTP_CMD_UPDATE_ASSOC
:
1319 sctp_cmd_assoc_update(commands
, asoc
, cmd
->obj
.asoc
);
1322 case SCTP_CMD_PURGE_OUTQUEUE
:
1323 sctp_outq_teardown(&asoc
->outqueue
);
1326 case SCTP_CMD_DELETE_TCB
:
1328 sctp_outq_uncork(&asoc
->outqueue
, gfp
);
1331 /* Delete the current association. */
1332 sctp_cmd_delete_tcb(commands
, asoc
);
1336 case SCTP_CMD_NEW_STATE
:
1337 /* Enter a new state. */
1338 sctp_cmd_new_state(commands
, asoc
, cmd
->obj
.state
);
1341 case SCTP_CMD_REPORT_TSN
:
1342 /* Record the arrival of a TSN. */
1343 error
= sctp_tsnmap_mark(&asoc
->peer
.tsn_map
,
1344 cmd
->obj
.u32
, NULL
);
1347 case SCTP_CMD_REPORT_FWDTSN
:
1348 /* Move the Cumulattive TSN Ack ahead. */
1349 sctp_tsnmap_skip(&asoc
->peer
.tsn_map
, cmd
->obj
.u32
);
1351 /* purge the fragmentation queue */
1352 sctp_ulpq_reasm_flushtsn(&asoc
->ulpq
, cmd
->obj
.u32
);
1354 /* Abort any in progress partial delivery. */
1355 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
1358 case SCTP_CMD_PROCESS_FWDTSN
:
1359 sctp_cmd_process_fwdtsn(&asoc
->ulpq
, cmd
->obj
.chunk
);
1362 case SCTP_CMD_GEN_SACK
:
1363 /* Generate a Selective ACK.
1364 * The argument tells us whether to just count
1365 * the packet and MAYBE generate a SACK, or
1368 force
= cmd
->obj
.i32
;
1369 error
= sctp_gen_sack(asoc
, force
, commands
);
1372 case SCTP_CMD_PROCESS_SACK
:
1373 /* Process an inbound SACK. */
1374 error
= sctp_cmd_process_sack(commands
, asoc
,
1378 case SCTP_CMD_GEN_INIT_ACK
:
1379 /* Generate an INIT ACK chunk. */
1380 new_obj
= sctp_make_init_ack(asoc
, chunk
, GFP_ATOMIC
,
1385 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1386 SCTP_CHUNK(new_obj
));
1389 case SCTP_CMD_PEER_INIT
:
1390 /* Process a unified INIT from the peer.
1391 * Note: Only used during INIT-ACK processing. If
1392 * there is an error just return to the outter
1393 * layer which will bail.
1395 error
= sctp_cmd_process_init(commands
, asoc
, chunk
,
1396 cmd
->obj
.init
, gfp
);
1399 case SCTP_CMD_GEN_COOKIE_ECHO
:
1400 /* Generate a COOKIE ECHO chunk. */
1401 new_obj
= sctp_make_cookie_echo(asoc
, chunk
);
1404 sctp_chunk_free(cmd
->obj
.chunk
);
1407 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1408 SCTP_CHUNK(new_obj
));
1410 /* If there is an ERROR chunk to be sent along with
1411 * the COOKIE_ECHO, send it, too.
1414 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1415 SCTP_CHUNK(cmd
->obj
.chunk
));
1417 if (new_obj
->transport
) {
1418 new_obj
->transport
->init_sent_count
++;
1419 asoc
->init_last_sent_to
= new_obj
->transport
;
1422 /* FIXME - Eventually come up with a cleaner way to
1423 * enabling COOKIE-ECHO + DATA bundling during
1424 * multihoming stale cookie scenarios, the following
1425 * command plays with asoc->peer.retran_path to
1426 * avoid the problem of sending the COOKIE-ECHO and
1427 * DATA in different paths, which could result
1428 * in the association being ABORTed if the DATA chunk
1429 * is processed first by the server. Checking the
1430 * init error counter simply causes this command
1431 * to be executed only during failed attempts of
1432 * association establishment.
1434 if ((asoc
->peer
.retran_path
!=
1435 asoc
->peer
.primary_path
) &&
1436 (asoc
->init_err_counter
> 0)) {
1437 sctp_add_cmd_sf(commands
,
1438 SCTP_CMD_FORCE_PRIM_RETRAN
,
1444 case SCTP_CMD_GEN_SHUTDOWN
:
1445 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1446 * Reset error counts.
1448 asoc
->overall_error_count
= 0;
1450 /* Generate a SHUTDOWN chunk. */
1451 new_obj
= sctp_make_shutdown(asoc
, chunk
);
1454 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1455 SCTP_CHUNK(new_obj
));
1458 case SCTP_CMD_CHUNK_ULP
:
1459 /* Send a chunk to the sockets layer. */
1460 pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n",
1461 __func__
, cmd
->obj
.chunk
, &asoc
->ulpq
);
1463 sctp_ulpq_tail_data(&asoc
->ulpq
, cmd
->obj
.chunk
,
1467 case SCTP_CMD_EVENT_ULP
:
1468 /* Send a notification to the sockets layer. */
1469 pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n",
1470 __func__
, cmd
->obj
.ulpevent
, &asoc
->ulpq
);
1472 sctp_ulpq_tail_event(&asoc
->ulpq
, cmd
->obj
.ulpevent
);
1475 case SCTP_CMD_REPLY
:
1476 /* If an caller has not already corked, do cork. */
1477 if (!asoc
->outqueue
.cork
) {
1478 sctp_outq_cork(&asoc
->outqueue
);
1481 /* Send a chunk to our peer. */
1482 sctp_outq_tail(&asoc
->outqueue
, cmd
->obj
.chunk
, gfp
);
1485 case SCTP_CMD_SEND_PKT
:
1486 /* Send a full packet to our peer. */
1487 packet
= cmd
->obj
.packet
;
1488 sctp_packet_transmit(packet
, gfp
);
1489 sctp_ootb_pkt_free(packet
);
1492 case SCTP_CMD_T1_RETRAN
:
1493 /* Mark a transport for retransmission. */
1494 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1498 case SCTP_CMD_RETRAN
:
1499 /* Mark a transport for retransmission. */
1500 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1504 case SCTP_CMD_ECN_CE
:
1505 /* Do delayed CE processing. */
1506 sctp_do_ecn_ce_work(asoc
, cmd
->obj
.u32
);
1509 case SCTP_CMD_ECN_ECNE
:
1510 /* Do delayed ECNE processing. */
1511 new_obj
= sctp_do_ecn_ecne_work(asoc
, cmd
->obj
.u32
,
1514 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1515 SCTP_CHUNK(new_obj
));
1518 case SCTP_CMD_ECN_CWR
:
1519 /* Do delayed CWR processing. */
1520 sctp_do_ecn_cwr_work(asoc
, cmd
->obj
.u32
);
1523 case SCTP_CMD_SETUP_T2
:
1524 sctp_cmd_setup_t2(commands
, asoc
, cmd
->obj
.chunk
);
1527 case SCTP_CMD_TIMER_START_ONCE
:
1528 timer
= &asoc
->timers
[cmd
->obj
.to
];
1530 if (timer_pending(timer
))
1534 case SCTP_CMD_TIMER_START
:
1535 timer
= &asoc
->timers
[cmd
->obj
.to
];
1536 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1539 timer
->expires
= jiffies
+ timeout
;
1540 sctp_association_hold(asoc
);
1544 case SCTP_CMD_TIMER_RESTART
:
1545 timer
= &asoc
->timers
[cmd
->obj
.to
];
1546 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1547 if (!mod_timer(timer
, jiffies
+ timeout
))
1548 sctp_association_hold(asoc
);
1551 case SCTP_CMD_TIMER_STOP
:
1552 timer
= &asoc
->timers
[cmd
->obj
.to
];
1553 if (del_timer(timer
))
1554 sctp_association_put(asoc
);
1557 case SCTP_CMD_INIT_CHOOSE_TRANSPORT
:
1558 chunk
= cmd
->obj
.chunk
;
1559 t
= sctp_assoc_choose_alter_transport(asoc
,
1560 asoc
->init_last_sent_to
);
1561 asoc
->init_last_sent_to
= t
;
1562 chunk
->transport
= t
;
1563 t
->init_sent_count
++;
1564 /* Set the new transport as primary */
1565 sctp_assoc_set_primary(asoc
, t
);
1568 case SCTP_CMD_INIT_RESTART
:
1569 /* Do the needed accounting and updates
1570 * associated with restarting an initialization
1571 * timer. Only multiply the timeout by two if
1572 * all transports have been tried at the current
1575 sctp_cmd_t1_timer_update(asoc
,
1576 SCTP_EVENT_TIMEOUT_T1_INIT
,
1579 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
1580 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT
));
1583 case SCTP_CMD_COOKIEECHO_RESTART
:
1584 /* Do the needed accounting and updates
1585 * associated with restarting an initialization
1586 * timer. Only multiply the timeout by two if
1587 * all transports have been tried at the current
1590 sctp_cmd_t1_timer_update(asoc
,
1591 SCTP_EVENT_TIMEOUT_T1_COOKIE
,
1594 /* If we've sent any data bundled with
1595 * COOKIE-ECHO we need to resend.
1597 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
1599 sctp_retransmit_mark(&asoc
->outqueue
, t
,
1603 sctp_add_cmd_sf(commands
,
1604 SCTP_CMD_TIMER_RESTART
,
1605 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE
));
1608 case SCTP_CMD_INIT_FAILED
:
1609 sctp_cmd_init_failed(commands
, asoc
, cmd
->obj
.err
);
1612 case SCTP_CMD_ASSOC_FAILED
:
1613 sctp_cmd_assoc_failed(commands
, asoc
, event_type
,
1614 subtype
, chunk
, cmd
->obj
.err
);
1617 case SCTP_CMD_INIT_COUNTER_INC
:
1618 asoc
->init_err_counter
++;
1621 case SCTP_CMD_INIT_COUNTER_RESET
:
1622 asoc
->init_err_counter
= 0;
1623 asoc
->init_cycle
= 0;
1624 list_for_each_entry(t
, &asoc
->peer
.transport_addr_list
,
1626 t
->init_sent_count
= 0;
1630 case SCTP_CMD_REPORT_DUP
:
1631 sctp_tsnmap_mark_dup(&asoc
->peer
.tsn_map
,
1635 case SCTP_CMD_REPORT_BAD_TAG
:
1636 pr_debug("%s: vtag mismatch!\n", __func__
);
1639 case SCTP_CMD_STRIKE
:
1640 /* Mark one strike against a transport. */
1641 sctp_do_8_2_transport_strike(commands
, asoc
,
1642 cmd
->obj
.transport
, 0);
1645 case SCTP_CMD_TRANSPORT_IDLE
:
1646 t
= cmd
->obj
.transport
;
1647 sctp_transport_lower_cwnd(t
, SCTP_LOWER_CWND_INACTIVE
);
1650 case SCTP_CMD_TRANSPORT_HB_SENT
:
1651 t
= cmd
->obj
.transport
;
1652 sctp_do_8_2_transport_strike(commands
, asoc
,
1657 case SCTP_CMD_TRANSPORT_ON
:
1658 t
= cmd
->obj
.transport
;
1659 sctp_cmd_transport_on(commands
, asoc
, t
, chunk
);
1662 case SCTP_CMD_HB_TIMERS_START
:
1663 sctp_cmd_hb_timers_start(commands
, asoc
);
1666 case SCTP_CMD_HB_TIMER_UPDATE
:
1667 t
= cmd
->obj
.transport
;
1668 sctp_transport_reset_hb_timer(t
);
1671 case SCTP_CMD_HB_TIMERS_STOP
:
1672 sctp_cmd_hb_timers_stop(commands
, asoc
);
1675 case SCTP_CMD_REPORT_ERROR
:
1676 error
= cmd
->obj
.error
;
1679 case SCTP_CMD_PROCESS_CTSN
:
1680 /* Dummy up a SACK for processing. */
1681 sackh
.cum_tsn_ack
= cmd
->obj
.be32
;
1682 sackh
.a_rwnd
= asoc
->peer
.rwnd
+
1683 asoc
->outqueue
.outstanding_bytes
;
1684 sackh
.num_gap_ack_blocks
= 0;
1685 sackh
.num_dup_tsns
= 0;
1686 chunk
->subh
.sack_hdr
= &sackh
;
1687 sctp_add_cmd_sf(commands
, SCTP_CMD_PROCESS_SACK
,
1691 case SCTP_CMD_DISCARD_PACKET
:
1692 /* We need to discard the whole packet.
1693 * Uncork the queue since there might be
1696 chunk
->pdiscard
= 1;
1698 sctp_outq_uncork(&asoc
->outqueue
, gfp
);
1703 case SCTP_CMD_RTO_PENDING
:
1704 t
= cmd
->obj
.transport
;
1708 case SCTP_CMD_PART_DELIVER
:
1709 sctp_ulpq_partial_delivery(&asoc
->ulpq
, GFP_ATOMIC
);
1712 case SCTP_CMD_RENEGE
:
1713 sctp_ulpq_renege(&asoc
->ulpq
, cmd
->obj
.chunk
,
1717 case SCTP_CMD_SETUP_T4
:
1718 sctp_cmd_setup_t4(commands
, asoc
, cmd
->obj
.chunk
);
1721 case SCTP_CMD_PROCESS_OPERR
:
1722 sctp_cmd_process_operr(commands
, asoc
, chunk
);
1724 case SCTP_CMD_CLEAR_INIT_TAG
:
1725 asoc
->peer
.i
.init_tag
= 0;
1727 case SCTP_CMD_DEL_NON_PRIMARY
:
1728 sctp_cmd_del_non_primary(asoc
);
1730 case SCTP_CMD_T3_RTX_TIMERS_STOP
:
1731 sctp_cmd_t3_rtx_timers_stop(commands
, asoc
);
1733 case SCTP_CMD_FORCE_PRIM_RETRAN
:
1734 t
= asoc
->peer
.retran_path
;
1735 asoc
->peer
.retran_path
= asoc
->peer
.primary_path
;
1736 sctp_outq_uncork(&asoc
->outqueue
, gfp
);
1738 asoc
->peer
.retran_path
= t
;
1740 case SCTP_CMD_SET_SK_ERR
:
1741 sctp_cmd_set_sk_err(asoc
, cmd
->obj
.error
);
1743 case SCTP_CMD_ASSOC_CHANGE
:
1744 sctp_cmd_assoc_change(commands
, asoc
,
1747 case SCTP_CMD_ADAPTATION_IND
:
1748 sctp_cmd_adaptation_ind(commands
, asoc
);
1751 case SCTP_CMD_ASSOC_SHKEY
:
1752 error
= sctp_auth_asoc_init_active_key(asoc
,
1755 case SCTP_CMD_UPDATE_INITTAG
:
1756 asoc
->peer
.i
.init_tag
= cmd
->obj
.u32
;
1758 case SCTP_CMD_SEND_MSG
:
1759 if (!asoc
->outqueue
.cork
) {
1760 sctp_outq_cork(&asoc
->outqueue
);
1763 sctp_cmd_send_msg(asoc
, cmd
->obj
.msg
, gfp
);
1765 case SCTP_CMD_SEND_NEXT_ASCONF
:
1766 sctp_cmd_send_asconf(asoc
);
1768 case SCTP_CMD_PURGE_ASCONF_QUEUE
:
1769 sctp_asconf_queue_teardown(asoc
);
1772 case SCTP_CMD_SET_ASOC
:
1773 if (asoc
&& local_cork
) {
1774 sctp_outq_uncork(&asoc
->outqueue
, gfp
);
1777 asoc
= cmd
->obj
.asoc
;
1781 pr_warn("Impossible command: %u\n",
1791 /* If this is in response to a received chunk, wait until
1792 * we are done with the packet to open the queue so that we don't
1793 * send multiple packets in response to a single request.
1795 if (asoc
&& SCTP_EVENT_T_CHUNK
== event_type
&& chunk
) {
1796 if (chunk
->end_of_packet
|| chunk
->singleton
)
1797 sctp_outq_uncork(&asoc
->outqueue
, gfp
);
1798 } else if (local_cork
)
1799 sctp_outq_uncork(&asoc
->outqueue
, gfp
);
1801 if (sp
->data_ready_signalled
)
1802 sp
->data_ready_signalled
= 0;