1 /* SCTP kernel reference 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 reference 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 * The SCTP reference 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 * The SCTP reference implementation is distributed in the hope that it
19 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
20 * ************************
21 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
22 * See the GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with GNU CC; see the file COPYING. If not, write to
26 * the Free Software Foundation, 59 Temple Place - Suite 330,
27 * Boston, MA 02111-1307, USA.
29 * Please send any bug reports or fixes you make to the
31 * lksctp developers <lksctp-developers@lists.sourceforge.net>
33 * Or submit a bug report through the following website:
34 * http://www.sf.net/projects/lksctp
36 * Written or modified by:
37 * La Monte H.P. Yarroll <piggy@acm.org>
38 * Karl Knutson <karl@athena.chicago.il.us>
39 * Jon Grimm <jgrimm@austin.ibm.com>
40 * Hui Huang <hui.huang@nokia.com>
41 * Dajiang Zhang <dajiang.zhang@nokia.com>
42 * Daisy Chang <daisyc@us.ibm.com>
43 * Sridhar Samudrala <sri@us.ibm.com>
44 * Ardelle Fan <ardelle.fan@intel.com>
46 * Any bugs reported given to us we will try to fix... any fixes shared will
47 * be incorporated into the next SCTP release.
50 #include <linux/skbuff.h>
51 #include <linux/types.h>
52 #include <linux/socket.h>
55 #include <net/sctp/sctp.h>
56 #include <net/sctp/sm.h>
58 static int sctp_cmd_interpreter(sctp_event_t event_type
,
59 sctp_subtype_t subtype
,
61 struct sctp_endpoint
*ep
,
62 struct sctp_association
*asoc
,
64 sctp_disposition_t status
,
65 sctp_cmd_seq_t
*commands
,
67 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
69 struct sctp_endpoint
*ep
,
70 struct sctp_association
*asoc
,
72 sctp_disposition_t status
,
73 sctp_cmd_seq_t
*commands
,
76 /********************************************************************
78 ********************************************************************/
80 /* A helper function for delayed processing of INET ECN CE bit. */
81 static void sctp_do_ecn_ce_work(struct sctp_association
*asoc
,
84 /* Save the TSN away for comparison when we receive CWR */
86 asoc
->last_ecne_tsn
= lowest_tsn
;
90 /* Helper function for delayed processing of SCTP ECNE chunk. */
91 /* RFC 2960 Appendix A
93 * RFC 2481 details a specific bit for a sender to send in
94 * the header of its next outbound TCP segment to indicate to
95 * its peer that it has reduced its congestion window. This
96 * is termed the CWR bit. For SCTP the same indication is made
97 * by including the CWR chunk. This chunk contains one data
98 * element, i.e. the TSN number that was sent in the ECNE chunk.
99 * This element represents the lowest TSN number in the datagram
100 * that was originally marked with the CE bit.
102 static struct sctp_chunk
*sctp_do_ecn_ecne_work(struct sctp_association
*asoc
,
104 struct sctp_chunk
*chunk
)
106 struct sctp_chunk
*repl
;
108 /* Our previously transmitted packet ran into some congestion
109 * so we should take action by reducing cwnd and ssthresh
110 * and then ACK our peer that we we've done so by
114 /* First, try to determine if we want to actually lower
115 * our cwnd variables. Only lower them if the ECNE looks more
116 * recent than the last response.
118 if (TSN_lt(asoc
->last_cwr_tsn
, lowest_tsn
)) {
119 struct sctp_transport
*transport
;
121 /* Find which transport's congestion variables
122 * need to be adjusted.
124 transport
= sctp_assoc_lookup_tsn(asoc
, lowest_tsn
);
126 /* Update the congestion variables. */
128 sctp_transport_lower_cwnd(transport
,
129 SCTP_LOWER_CWND_ECNE
);
130 asoc
->last_cwr_tsn
= lowest_tsn
;
133 /* Always try to quiet the other end. In case of lost CWR,
134 * resend last_cwr_tsn.
136 repl
= sctp_make_cwr(asoc
, asoc
->last_cwr_tsn
, chunk
);
138 /* If we run out of memory, it will look like a lost CWR. We'll
139 * get back in sync eventually.
144 /* Helper function to do delayed processing of ECN CWR chunk. */
145 static void sctp_do_ecn_cwr_work(struct sctp_association
*asoc
,
148 /* Turn off ECNE getting auto-prepended to every outgoing
154 /* Generate SACK if necessary. We call this at the end of a packet. */
155 static int sctp_gen_sack(struct sctp_association
*asoc
, int force
,
156 sctp_cmd_seq_t
*commands
)
158 __u32 ctsn
, max_tsn_seen
;
159 struct sctp_chunk
*sack
;
160 struct sctp_transport
*trans
= asoc
->peer
.last_data_from
;
164 (!trans
&& (asoc
->param_flags
& SPP_SACKDELAY_DISABLE
)) ||
165 (trans
&& (trans
->param_flags
& SPP_SACKDELAY_DISABLE
)))
166 asoc
->peer
.sack_needed
= 1;
168 ctsn
= sctp_tsnmap_get_ctsn(&asoc
->peer
.tsn_map
);
169 max_tsn_seen
= sctp_tsnmap_get_max_tsn_seen(&asoc
->peer
.tsn_map
);
171 /* From 12.2 Parameters necessary per association (i.e. the TCB):
173 * Ack State : This flag indicates if the next received packet
174 * : is to be responded to with a SACK. ...
175 * : When DATA chunks are out of order, SACK's
176 * : are not delayed (see Section 6).
178 * [This is actually not mentioned in Section 6, but we
179 * implement it here anyway. --piggy]
181 if (max_tsn_seen
!= ctsn
)
182 asoc
->peer
.sack_needed
= 1;
184 /* From 6.2 Acknowledgement on Reception of DATA Chunks:
186 * Section 4.2 of [RFC2581] SHOULD be followed. Specifically,
187 * an acknowledgement SHOULD be generated for at least every
188 * second packet (not every second DATA chunk) received, and
189 * SHOULD be generated within 200 ms of the arrival of any
190 * unacknowledged DATA chunk. ...
192 if (!asoc
->peer
.sack_needed
) {
193 /* We will need a SACK for the next packet. */
194 asoc
->peer
.sack_needed
= 1;
196 /* Set the SACK delay timeout based on the
197 * SACK delay for the last transport
198 * data was received from, or the default
199 * for the association.
202 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
205 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_SACK
] =
208 /* Restart the SACK timer. */
209 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
210 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
212 if (asoc
->a_rwnd
> asoc
->rwnd
)
213 asoc
->a_rwnd
= asoc
->rwnd
;
214 sack
= sctp_make_sack(asoc
);
218 asoc
->peer
.sack_needed
= 0;
220 error
= sctp_outq_tail(&asoc
->outqueue
, sack
);
222 /* Stop the SACK timer. */
223 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_STOP
,
224 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK
));
233 /* When the T3-RTX timer expires, it calls this function to create the
234 * relevant state machine event.
236 void sctp_generate_t3_rtx_event(unsigned long peer
)
239 struct sctp_transport
*transport
= (struct sctp_transport
*) peer
;
240 struct sctp_association
*asoc
= transport
->asoc
;
242 /* Check whether a task is in the sock. */
244 sctp_bh_lock_sock(asoc
->base
.sk
);
245 if (sock_owned_by_user(asoc
->base
.sk
)) {
246 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __FUNCTION__
);
248 /* Try again later. */
249 if (!mod_timer(&transport
->T3_rtx_timer
, jiffies
+ (HZ
/20)))
250 sctp_transport_hold(transport
);
254 /* Is this transport really dead and just waiting around for
255 * the timer to let go of the reference?
260 /* Run through the state machine. */
261 error
= sctp_do_sm(SCTP_EVENT_T_TIMEOUT
,
262 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX
),
265 transport
, GFP_ATOMIC
);
268 asoc
->base
.sk
->sk_err
= -error
;
271 sctp_bh_unlock_sock(asoc
->base
.sk
);
272 sctp_transport_put(transport
);
275 /* This is a sa interface for producing timeout events. It works
276 * for timeouts which use the association as their parameter.
278 static void sctp_generate_timeout_event(struct sctp_association
*asoc
,
279 sctp_event_timeout_t timeout_type
)
283 sctp_bh_lock_sock(asoc
->base
.sk
);
284 if (sock_owned_by_user(asoc
->base
.sk
)) {
285 SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n",
289 /* Try again later. */
290 if (!mod_timer(&asoc
->timers
[timeout_type
], jiffies
+ (HZ
/20)))
291 sctp_association_hold(asoc
);
295 /* Is this association really dead and just waiting around for
296 * the timer to let go of the reference?
301 /* Run through the state machine. */
302 error
= sctp_do_sm(SCTP_EVENT_T_TIMEOUT
,
303 SCTP_ST_TIMEOUT(timeout_type
),
304 asoc
->state
, asoc
->ep
, asoc
,
305 (void *)timeout_type
, GFP_ATOMIC
);
308 asoc
->base
.sk
->sk_err
= -error
;
311 sctp_bh_unlock_sock(asoc
->base
.sk
);
312 sctp_association_put(asoc
);
315 static void sctp_generate_t1_cookie_event(unsigned long data
)
317 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
318 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_COOKIE
);
321 static void sctp_generate_t1_init_event(unsigned long data
)
323 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
324 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T1_INIT
);
327 static void sctp_generate_t2_shutdown_event(unsigned long data
)
329 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
330 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
);
333 static void sctp_generate_t4_rto_event(unsigned long data
)
335 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
336 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_T4_RTO
);
339 static void sctp_generate_t5_shutdown_guard_event(unsigned long data
)
341 struct sctp_association
*asoc
= (struct sctp_association
*)data
;
342 sctp_generate_timeout_event(asoc
,
343 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD
);
345 } /* sctp_generate_t5_shutdown_guard_event() */
347 static void sctp_generate_autoclose_event(unsigned long data
)
349 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
350 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_AUTOCLOSE
);
353 /* Generate a heart beat event. If the sock is busy, reschedule. Make
354 * sure that the transport is still valid.
356 void sctp_generate_heartbeat_event(unsigned long data
)
359 struct sctp_transport
*transport
= (struct sctp_transport
*) data
;
360 struct sctp_association
*asoc
= transport
->asoc
;
362 sctp_bh_lock_sock(asoc
->base
.sk
);
363 if (sock_owned_by_user(asoc
->base
.sk
)) {
364 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __FUNCTION__
);
366 /* Try again later. */
367 if (!mod_timer(&transport
->hb_timer
, jiffies
+ (HZ
/20)))
368 sctp_transport_hold(transport
);
372 /* Is this structure just waiting around for us to actually
378 error
= sctp_do_sm(SCTP_EVENT_T_TIMEOUT
,
379 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT
),
380 asoc
->state
, asoc
->ep
, asoc
,
381 transport
, GFP_ATOMIC
);
384 asoc
->base
.sk
->sk_err
= -error
;
387 sctp_bh_unlock_sock(asoc
->base
.sk
);
388 sctp_transport_put(transport
);
391 /* Inject a SACK Timeout event into the state machine. */
392 static void sctp_generate_sack_event(unsigned long data
)
394 struct sctp_association
*asoc
= (struct sctp_association
*) data
;
395 sctp_generate_timeout_event(asoc
, SCTP_EVENT_TIMEOUT_SACK
);
398 sctp_timer_event_t
*sctp_timer_events
[SCTP_NUM_TIMEOUT_TYPES
] = {
400 sctp_generate_t1_cookie_event
,
401 sctp_generate_t1_init_event
,
402 sctp_generate_t2_shutdown_event
,
404 sctp_generate_t4_rto_event
,
405 sctp_generate_t5_shutdown_guard_event
,
407 sctp_generate_sack_event
,
408 sctp_generate_autoclose_event
,
412 /* RFC 2960 8.2 Path Failure Detection
414 * When its peer endpoint is multi-homed, an endpoint should keep a
415 * error counter for each of the destination transport addresses of the
418 * Each time the T3-rtx timer expires on any address, or when a
419 * HEARTBEAT sent to an idle address is not acknowledged within a RTO,
420 * the error counter of that destination address will be incremented.
421 * When the value in the error counter exceeds the protocol parameter
422 * 'Path.Max.Retrans' of that destination address, the endpoint should
423 * mark the destination transport address as inactive, and a
424 * notification SHOULD be sent to the upper layer.
427 static void sctp_do_8_2_transport_strike(struct sctp_association
*asoc
,
428 struct sctp_transport
*transport
)
430 /* The check for association's overall error counter exceeding the
431 * threshold is done in the state function.
433 asoc
->overall_error_count
++;
435 if (transport
->state
!= SCTP_INACTIVE
&&
436 (transport
->error_count
++ >= transport
->pathmaxrxt
)) {
437 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
438 " transport IP: port:%d failed.\n",
440 (&transport
->ipaddr
),
441 transport
->ipaddr
.v4
.sin_port
);
442 sctp_assoc_control_transport(asoc
, transport
,
444 SCTP_FAILED_THRESHOLD
);
447 /* E2) For the destination address for which the timer
448 * expires, set RTO <- RTO * 2 ("back off the timer"). The
449 * maximum value discussed in rule C7 above (RTO.max) may be
450 * used to provide an upper bound to this doubling operation.
452 transport
->rto
= min((transport
->rto
* 2), transport
->asoc
->rto_max
);
455 /* Worker routine to handle INIT command failure. */
456 static void sctp_cmd_init_failed(sctp_cmd_seq_t
*commands
,
457 struct sctp_association
*asoc
,
460 struct sctp_ulpevent
*event
;
462 event
= sctp_ulpevent_make_assoc_change(asoc
,0, SCTP_CANT_STR_ASSOC
,
467 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
468 SCTP_ULPEVENT(event
));
470 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
471 SCTP_STATE(SCTP_STATE_CLOSED
));
473 /* SEND_FAILED sent later when cleaning up the association. */
474 asoc
->outqueue
.error
= error
;
475 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
478 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */
479 static void sctp_cmd_assoc_failed(sctp_cmd_seq_t
*commands
,
480 struct sctp_association
*asoc
,
481 sctp_event_t event_type
,
482 sctp_subtype_t subtype
,
483 struct sctp_chunk
*chunk
,
486 struct sctp_ulpevent
*event
;
488 /* Cancel any partial delivery in progress. */
489 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
491 event
= sctp_ulpevent_make_assoc_change(asoc
, 0, SCTP_COMM_LOST
,
495 sctp_add_cmd_sf(commands
, SCTP_CMD_EVENT_ULP
,
496 SCTP_ULPEVENT(event
));
498 sctp_add_cmd_sf(commands
, SCTP_CMD_NEW_STATE
,
499 SCTP_STATE(SCTP_STATE_CLOSED
));
501 /* Set sk_err to ECONNRESET on a 1-1 style socket. */
502 if (!sctp_style(asoc
->base
.sk
, UDP
))
503 asoc
->base
.sk
->sk_err
= ECONNRESET
;
505 /* SEND_FAILED sent later when cleaning up the association. */
506 asoc
->outqueue
.error
= error
;
507 sctp_add_cmd_sf(commands
, SCTP_CMD_DELETE_TCB
, SCTP_NULL());
510 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT
511 * inside the cookie. In reality, this is only used for INIT-ACK processing
512 * since all other cases use "temporary" associations and can do all
513 * their work in statefuns directly.
515 static int sctp_cmd_process_init(sctp_cmd_seq_t
*commands
,
516 struct sctp_association
*asoc
,
517 struct sctp_chunk
*chunk
,
518 sctp_init_chunk_t
*peer_init
,
523 /* We only process the init as a sideeffect in a single
524 * case. This is when we process the INIT-ACK. If we
525 * fail during INIT processing (due to malloc problems),
526 * just return the error and stop processing the stack.
528 if (!sctp_process_init(asoc
, chunk
->chunk_hdr
->type
,
529 sctp_source(chunk
), peer_init
, gfp
))
537 /* Helper function to break out starting up of heartbeat timers. */
538 static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t
*cmds
,
539 struct sctp_association
*asoc
)
541 struct sctp_transport
*t
;
542 struct list_head
*pos
;
544 /* Start a heartbeat timer for each transport on the association.
545 * hold a reference on the transport to make sure none of
546 * the needed data structures go away.
548 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
549 t
= list_entry(pos
, struct sctp_transport
, transports
);
551 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
552 sctp_transport_hold(t
);
556 static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t
*cmds
,
557 struct sctp_association
*asoc
)
559 struct sctp_transport
*t
;
560 struct list_head
*pos
;
562 /* Stop all heartbeat timers. */
564 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
565 t
= list_entry(pos
, struct sctp_transport
, transports
);
566 if (del_timer(&t
->hb_timer
))
567 sctp_transport_put(t
);
571 /* Helper function to stop any pending T3-RTX timers */
572 static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t
*cmds
,
573 struct sctp_association
*asoc
)
575 struct sctp_transport
*t
;
576 struct list_head
*pos
;
578 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
579 t
= list_entry(pos
, struct sctp_transport
, transports
);
580 if (timer_pending(&t
->T3_rtx_timer
) &&
581 del_timer(&t
->T3_rtx_timer
)) {
582 sctp_transport_put(t
);
588 /* Helper function to update the heartbeat timer. */
589 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t
*cmds
,
590 struct sctp_association
*asoc
,
591 struct sctp_transport
*t
)
593 /* Update the heartbeat timer. */
594 if (!mod_timer(&t
->hb_timer
, sctp_transport_timeout(t
)))
595 sctp_transport_hold(t
);
598 /* Helper function to handle the reception of an HEARTBEAT ACK. */
599 static void sctp_cmd_transport_on(sctp_cmd_seq_t
*cmds
,
600 struct sctp_association
*asoc
,
601 struct sctp_transport
*t
,
602 struct sctp_chunk
*chunk
)
604 sctp_sender_hb_info_t
*hbinfo
;
606 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the
607 * HEARTBEAT should clear the error counter of the destination
608 * transport address to which the HEARTBEAT was sent.
609 * The association's overall error count is also cleared.
612 t
->asoc
->overall_error_count
= 0;
614 /* Mark the destination transport address as active if it is not so
617 if (t
->state
== SCTP_INACTIVE
)
618 sctp_assoc_control_transport(asoc
, t
, SCTP_TRANSPORT_UP
,
619 SCTP_HEARTBEAT_SUCCESS
);
621 /* The receiver of the HEARTBEAT ACK should also perform an
622 * RTT measurement for that destination transport address
623 * using the time value carried in the HEARTBEAT ACK chunk.
625 hbinfo
= (sctp_sender_hb_info_t
*) chunk
->skb
->data
;
626 sctp_transport_update_rto(t
, (jiffies
- hbinfo
->sent_at
));
629 /* Helper function to do a transport reset at the expiry of the hearbeat
632 static void sctp_cmd_transport_reset(sctp_cmd_seq_t
*cmds
,
633 struct sctp_association
*asoc
,
634 struct sctp_transport
*t
)
636 sctp_transport_lower_cwnd(t
, SCTP_LOWER_CWND_INACTIVE
);
638 /* Mark one strike against a transport. */
639 sctp_do_8_2_transport_strike(asoc
, t
);
642 /* Helper function to process the process SACK command. */
643 static int sctp_cmd_process_sack(sctp_cmd_seq_t
*cmds
,
644 struct sctp_association
*asoc
,
645 struct sctp_sackhdr
*sackh
)
649 if (sctp_outq_sack(&asoc
->outqueue
, sackh
)) {
650 /* There are no more TSNs awaiting SACK. */
651 err
= sctp_do_sm(SCTP_EVENT_T_OTHER
,
652 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN
),
653 asoc
->state
, asoc
->ep
, asoc
, NULL
,
656 /* Windows may have opened, so we need
657 * to check if we have DATA to transmit
659 err
= sctp_outq_flush(&asoc
->outqueue
, 0);
665 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set
666 * the transport for a shutdown chunk.
668 static void sctp_cmd_setup_t2(sctp_cmd_seq_t
*cmds
,
669 struct sctp_association
*asoc
,
670 struct sctp_chunk
*chunk
)
672 struct sctp_transport
*t
;
674 t
= sctp_assoc_choose_shutdown_transport(asoc
);
675 asoc
->shutdown_last_sent_to
= t
;
676 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN
] = t
->rto
;
677 chunk
->transport
= t
;
680 /* Helper function to change the state of an association. */
681 static void sctp_cmd_new_state(sctp_cmd_seq_t
*cmds
,
682 struct sctp_association
*asoc
,
685 struct sock
*sk
= asoc
->base
.sk
;
689 SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n",
690 asoc
, sctp_state_tbl
[state
]);
692 if (sctp_style(sk
, TCP
)) {
693 /* Change the sk->sk_state of a TCP-style socket that has
694 * sucessfully completed a connect() call.
696 if (sctp_state(asoc
, ESTABLISHED
) && sctp_sstate(sk
, CLOSED
))
697 sk
->sk_state
= SCTP_SS_ESTABLISHED
;
699 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
700 if (sctp_state(asoc
, SHUTDOWN_RECEIVED
) &&
701 sctp_sstate(sk
, ESTABLISHED
))
702 sk
->sk_shutdown
|= RCV_SHUTDOWN
;
705 if (sctp_state(asoc
, COOKIE_WAIT
)) {
706 /* Reset init timeouts since they may have been
707 * increased due to timer expirations.
709 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] =
711 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] =
715 if (sctp_state(asoc
, ESTABLISHED
) ||
716 sctp_state(asoc
, CLOSED
) ||
717 sctp_state(asoc
, SHUTDOWN_RECEIVED
)) {
718 /* Wake up any processes waiting in the asoc's wait queue in
719 * sctp_wait_for_connect() or sctp_wait_for_sndbuf().
721 if (waitqueue_active(&asoc
->wait
))
722 wake_up_interruptible(&asoc
->wait
);
724 /* Wake up any processes waiting in the sk's sleep queue of
725 * a TCP-style or UDP-style peeled-off socket in
726 * sctp_wait_for_accept() or sctp_wait_for_packet().
727 * For a UDP-style socket, the waiters are woken up by the
730 if (!sctp_style(sk
, UDP
))
731 sk
->sk_state_change(sk
);
735 /* Helper function to delete an association. */
736 static void sctp_cmd_delete_tcb(sctp_cmd_seq_t
*cmds
,
737 struct sctp_association
*asoc
)
739 struct sock
*sk
= asoc
->base
.sk
;
741 /* If it is a non-temporary association belonging to a TCP-style
742 * listening socket that is not closed, do not free it so that accept()
743 * can pick it up later.
745 if (sctp_style(sk
, TCP
) && sctp_sstate(sk
, LISTENING
) &&
746 (!asoc
->temp
) && (sk
->sk_shutdown
!= SHUTDOWN_MASK
))
749 sctp_unhash_established(asoc
);
750 sctp_association_free(asoc
);
754 * ADDIP Section 4.1 ASCONF Chunk Procedures
755 * A4) Start a T-4 RTO timer, using the RTO value of the selected
756 * destination address (we use active path instead of primary path just
757 * because primary path may be inactive.
759 static void sctp_cmd_setup_t4(sctp_cmd_seq_t
*cmds
,
760 struct sctp_association
*asoc
,
761 struct sctp_chunk
*chunk
)
763 struct sctp_transport
*t
;
765 t
= asoc
->peer
.active_path
;
766 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T4_RTO
] = t
->rto
;
767 chunk
->transport
= t
;
770 /* Process an incoming Operation Error Chunk. */
771 static void sctp_cmd_process_operr(sctp_cmd_seq_t
*cmds
,
772 struct sctp_association
*asoc
,
773 struct sctp_chunk
*chunk
)
775 struct sctp_operr_chunk
*operr_chunk
;
776 struct sctp_errhdr
*err_hdr
;
778 operr_chunk
= (struct sctp_operr_chunk
*)chunk
->chunk_hdr
;
779 err_hdr
= &operr_chunk
->err_hdr
;
781 switch (err_hdr
->cause
) {
782 case SCTP_ERROR_UNKNOWN_CHUNK
:
784 struct sctp_chunkhdr
*unk_chunk_hdr
;
786 unk_chunk_hdr
= (struct sctp_chunkhdr
*)err_hdr
->variable
;
787 switch (unk_chunk_hdr
->type
) {
788 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with an
789 * ERROR chunk reporting that it did not recognized the ASCONF
790 * chunk type, the sender of the ASCONF MUST NOT send any
791 * further ASCONF chunks and MUST stop its T-4 timer.
793 case SCTP_CID_ASCONF
:
794 asoc
->peer
.asconf_capable
= 0;
795 sctp_add_cmd_sf(cmds
, SCTP_CMD_TIMER_STOP
,
796 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO
));
808 /* Process variable FWDTSN chunk information. */
809 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq
*ulpq
,
810 struct sctp_chunk
*chunk
)
812 struct sctp_fwdtsn_skip
*skip
;
813 /* Walk through all the skipped SSNs */
814 sctp_walk_fwdtsn(skip
, chunk
) {
815 sctp_ulpq_skip(ulpq
, ntohs(skip
->stream
), ntohs(skip
->ssn
));
821 /* Helper function to remove the association non-primary peer
824 static void sctp_cmd_del_non_primary(struct sctp_association
*asoc
)
826 struct sctp_transport
*t
;
827 struct list_head
*pos
;
828 struct list_head
*temp
;
830 list_for_each_safe(pos
, temp
, &asoc
->peer
.transport_addr_list
) {
831 t
= list_entry(pos
, struct sctp_transport
, transports
);
832 if (!sctp_cmp_addr_exact(&t
->ipaddr
,
833 &asoc
->peer
.primary_addr
)) {
834 sctp_assoc_del_peer(asoc
, &t
->ipaddr
);
841 /* These three macros allow us to pull the debugging code out of the
842 * main flow of sctp_do_sm() to keep attention focused on the real
843 * functionality there.
846 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \
847 "ep %p, %s, %s, asoc %p[%s], %s\n", \
848 ep, sctp_evttype_tbl[event_type], \
849 (*debug_fn)(subtype), asoc, \
850 sctp_state_tbl[state], state_fn->name)
853 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \
854 "asoc %p, status: %s\n", \
855 asoc, sctp_status_tbl[status])
857 #define DEBUG_POST_SFX \
858 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \
860 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \
861 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED])
864 * This is the master state machine processing function.
866 * If you want to understand all of lksctp, this is a
867 * good place to start.
869 int sctp_do_sm(sctp_event_t event_type
, sctp_subtype_t subtype
,
871 struct sctp_endpoint
*ep
,
872 struct sctp_association
*asoc
,
876 sctp_cmd_seq_t commands
;
877 const sctp_sm_table_entry_t
*state_fn
;
878 sctp_disposition_t status
;
880 typedef const char *(printfn_t
)(sctp_subtype_t
);
882 static printfn_t
*table
[] = {
883 NULL
, sctp_cname
, sctp_tname
, sctp_oname
, sctp_pname
,
885 printfn_t
*debug_fn
__attribute__ ((unused
)) = table
[event_type
];
887 /* Look up the state function, run it, and then process the
888 * side effects. These three steps are the heart of lksctp.
890 state_fn
= sctp_sm_lookup_event(event_type
, state
, subtype
);
892 sctp_init_cmd_seq(&commands
);
895 status
= (*state_fn
->fn
)(ep
, asoc
, subtype
, event_arg
, &commands
);
898 error
= sctp_side_effects(event_type
, subtype
, state
,
899 ep
, asoc
, event_arg
, status
,
909 /*****************************************************************
910 * This the master state function side effect processing function.
911 *****************************************************************/
912 static int sctp_side_effects(sctp_event_t event_type
, sctp_subtype_t subtype
,
914 struct sctp_endpoint
*ep
,
915 struct sctp_association
*asoc
,
917 sctp_disposition_t status
,
918 sctp_cmd_seq_t
*commands
,
923 /* FIXME - Most of the dispositions left today would be categorized
924 * as "exceptional" dispositions. For those dispositions, it
925 * may not be proper to run through any of the commands at all.
926 * For example, the command interpreter might be run only with
927 * disposition SCTP_DISPOSITION_CONSUME.
929 if (0 != (error
= sctp_cmd_interpreter(event_type
, subtype
, state
,
936 case SCTP_DISPOSITION_DISCARD
:
937 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, "
938 "event_type %d, event_id %d\n",
939 state
, event_type
, subtype
.chunk
);
942 case SCTP_DISPOSITION_NOMEM
:
943 /* We ran out of memory, so we need to discard this
946 /* BUG--we should now recover some memory, probably by
952 case SCTP_DISPOSITION_DELETE_TCB
:
953 /* This should now be a command. */
956 case SCTP_DISPOSITION_CONSUME
:
957 case SCTP_DISPOSITION_ABORT
:
959 * We should no longer have much work to do here as the
960 * real work has been done as explicit commands above.
964 case SCTP_DISPOSITION_VIOLATION
:
965 printk(KERN_ERR
"sctp protocol violation state %d "
966 "chunkid %d\n", state
, subtype
.chunk
);
969 case SCTP_DISPOSITION_NOT_IMPL
:
970 printk(KERN_WARNING
"sctp unimplemented feature in state %d, "
971 "event_type %d, event_id %d\n",
972 state
, event_type
, subtype
.chunk
);
975 case SCTP_DISPOSITION_BUG
:
976 printk(KERN_ERR
"sctp bug in state %d, "
977 "event_type %d, event_id %d\n",
978 state
, event_type
, subtype
.chunk
);
983 printk(KERN_ERR
"sctp impossible disposition %d "
984 "in state %d, event_type %d, event_id %d\n",
985 status
, state
, event_type
, subtype
.chunk
);
994 /********************************************************************
995 * 2nd Level Abstractions
996 ********************************************************************/
998 /* This is the side-effect interpreter. */
999 static int sctp_cmd_interpreter(sctp_event_t event_type
,
1000 sctp_subtype_t subtype
,
1002 struct sctp_endpoint
*ep
,
1003 struct sctp_association
*asoc
,
1005 sctp_disposition_t status
,
1006 sctp_cmd_seq_t
*commands
,
1012 struct sctp_chunk
*new_obj
;
1013 struct sctp_chunk
*chunk
= NULL
;
1014 struct sctp_packet
*packet
;
1015 struct list_head
*pos
;
1016 struct timer_list
*timer
;
1017 unsigned long timeout
;
1018 struct sctp_transport
*t
;
1019 struct sctp_sackhdr sackh
;
1022 if (SCTP_EVENT_T_TIMEOUT
!= event_type
)
1023 chunk
= (struct sctp_chunk
*) event_arg
;
1025 /* Note: This whole file is a huge candidate for rework.
1026 * For example, each command could either have its own handler, so
1027 * the loop would look like:
1029 * cmd->handle(x, y, z)
1032 while (NULL
!= (cmd
= sctp_next_cmd(commands
))) {
1033 switch (cmd
->verb
) {
1038 case SCTP_CMD_NEW_ASOC
:
1039 /* Register a new association. */
1041 sctp_outq_uncork(&asoc
->outqueue
);
1044 asoc
= cmd
->obj
.ptr
;
1045 /* Register with the endpoint. */
1046 sctp_endpoint_add_asoc(ep
, asoc
);
1047 sctp_hash_established(asoc
);
1050 case SCTP_CMD_UPDATE_ASSOC
:
1051 sctp_assoc_update(asoc
, cmd
->obj
.ptr
);
1054 case SCTP_CMD_PURGE_OUTQUEUE
:
1055 sctp_outq_teardown(&asoc
->outqueue
);
1058 case SCTP_CMD_DELETE_TCB
:
1060 sctp_outq_uncork(&asoc
->outqueue
);
1063 /* Delete the current association. */
1064 sctp_cmd_delete_tcb(commands
, asoc
);
1068 case SCTP_CMD_NEW_STATE
:
1069 /* Enter a new state. */
1070 sctp_cmd_new_state(commands
, asoc
, cmd
->obj
.state
);
1073 case SCTP_CMD_REPORT_TSN
:
1074 /* Record the arrival of a TSN. */
1075 sctp_tsnmap_mark(&asoc
->peer
.tsn_map
, cmd
->obj
.u32
);
1078 case SCTP_CMD_REPORT_FWDTSN
:
1079 /* Move the Cumulattive TSN Ack ahead. */
1080 sctp_tsnmap_skip(&asoc
->peer
.tsn_map
, cmd
->obj
.u32
);
1082 /* Abort any in progress partial delivery. */
1083 sctp_ulpq_abort_pd(&asoc
->ulpq
, GFP_ATOMIC
);
1086 case SCTP_CMD_PROCESS_FWDTSN
:
1087 sctp_cmd_process_fwdtsn(&asoc
->ulpq
, cmd
->obj
.ptr
);
1090 case SCTP_CMD_GEN_SACK
:
1091 /* Generate a Selective ACK.
1092 * The argument tells us whether to just count
1093 * the packet and MAYBE generate a SACK, or
1096 force
= cmd
->obj
.i32
;
1097 error
= sctp_gen_sack(asoc
, force
, commands
);
1100 case SCTP_CMD_PROCESS_SACK
:
1101 /* Process an inbound SACK. */
1102 error
= sctp_cmd_process_sack(commands
, asoc
,
1106 case SCTP_CMD_GEN_INIT_ACK
:
1107 /* Generate an INIT ACK chunk. */
1108 new_obj
= sctp_make_init_ack(asoc
, chunk
, GFP_ATOMIC
,
1113 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1114 SCTP_CHUNK(new_obj
));
1117 case SCTP_CMD_PEER_INIT
:
1118 /* Process a unified INIT from the peer.
1119 * Note: Only used during INIT-ACK processing. If
1120 * there is an error just return to the outter
1121 * layer which will bail.
1123 error
= sctp_cmd_process_init(commands
, asoc
, chunk
,
1127 case SCTP_CMD_GEN_COOKIE_ECHO
:
1128 /* Generate a COOKIE ECHO chunk. */
1129 new_obj
= sctp_make_cookie_echo(asoc
, chunk
);
1132 sctp_chunk_free(cmd
->obj
.ptr
);
1135 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1136 SCTP_CHUNK(new_obj
));
1138 /* If there is an ERROR chunk to be sent along with
1139 * the COOKIE_ECHO, send it, too.
1142 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1143 SCTP_CHUNK(cmd
->obj
.ptr
));
1145 /* FIXME - Eventually come up with a cleaner way to
1146 * enabling COOKIE-ECHO + DATA bundling during
1147 * multihoming stale cookie scenarios, the following
1148 * command plays with asoc->peer.retran_path to
1149 * avoid the problem of sending the COOKIE-ECHO and
1150 * DATA in different paths, which could result
1151 * in the association being ABORTed if the DATA chunk
1152 * is processed first by the server. Checking the
1153 * init error counter simply causes this command
1154 * to be executed only during failed attempts of
1155 * association establishment.
1157 if ((asoc
->peer
.retran_path
!=
1158 asoc
->peer
.primary_path
) &&
1159 (asoc
->init_err_counter
> 0)) {
1160 sctp_add_cmd_sf(commands
,
1161 SCTP_CMD_FORCE_PRIM_RETRAN
,
1167 case SCTP_CMD_GEN_SHUTDOWN
:
1168 /* Generate SHUTDOWN when in SHUTDOWN_SENT state.
1169 * Reset error counts.
1171 asoc
->overall_error_count
= 0;
1173 /* Generate a SHUTDOWN chunk. */
1174 new_obj
= sctp_make_shutdown(asoc
, chunk
);
1177 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1178 SCTP_CHUNK(new_obj
));
1181 case SCTP_CMD_CHUNK_ULP
:
1182 /* Send a chunk to the sockets layer. */
1183 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1184 "chunk_up:", cmd
->obj
.ptr
,
1185 "ulpq:", &asoc
->ulpq
);
1186 sctp_ulpq_tail_data(&asoc
->ulpq
, cmd
->obj
.ptr
,
1190 case SCTP_CMD_EVENT_ULP
:
1191 /* Send a notification to the sockets layer. */
1192 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n",
1193 "event_up:",cmd
->obj
.ptr
,
1194 "ulpq:",&asoc
->ulpq
);
1195 sctp_ulpq_tail_event(&asoc
->ulpq
, cmd
->obj
.ptr
);
1198 case SCTP_CMD_REPLY
:
1199 /* If an caller has not already corked, do cork. */
1200 if (!asoc
->outqueue
.cork
) {
1201 sctp_outq_cork(&asoc
->outqueue
);
1204 /* Send a chunk to our peer. */
1205 error
= sctp_outq_tail(&asoc
->outqueue
, cmd
->obj
.ptr
);
1208 case SCTP_CMD_SEND_PKT
:
1209 /* Send a full packet to our peer. */
1210 packet
= cmd
->obj
.ptr
;
1211 sctp_packet_transmit(packet
);
1212 sctp_ootb_pkt_free(packet
);
1215 case SCTP_CMD_RETRAN
:
1216 /* Mark a transport for retransmission. */
1217 sctp_retransmit(&asoc
->outqueue
, cmd
->obj
.transport
,
1221 case SCTP_CMD_TRANSMIT
:
1222 /* Kick start transmission. */
1223 error
= sctp_outq_uncork(&asoc
->outqueue
);
1227 case SCTP_CMD_ECN_CE
:
1228 /* Do delayed CE processing. */
1229 sctp_do_ecn_ce_work(asoc
, cmd
->obj
.u32
);
1232 case SCTP_CMD_ECN_ECNE
:
1233 /* Do delayed ECNE processing. */
1234 new_obj
= sctp_do_ecn_ecne_work(asoc
, cmd
->obj
.u32
,
1237 sctp_add_cmd_sf(commands
, SCTP_CMD_REPLY
,
1238 SCTP_CHUNK(new_obj
));
1241 case SCTP_CMD_ECN_CWR
:
1242 /* Do delayed CWR processing. */
1243 sctp_do_ecn_cwr_work(asoc
, cmd
->obj
.u32
);
1246 case SCTP_CMD_SETUP_T2
:
1247 sctp_cmd_setup_t2(commands
, asoc
, cmd
->obj
.ptr
);
1250 case SCTP_CMD_TIMER_START
:
1251 timer
= &asoc
->timers
[cmd
->obj
.to
];
1252 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1255 timer
->expires
= jiffies
+ timeout
;
1256 sctp_association_hold(asoc
);
1260 case SCTP_CMD_TIMER_RESTART
:
1261 timer
= &asoc
->timers
[cmd
->obj
.to
];
1262 timeout
= asoc
->timeouts
[cmd
->obj
.to
];
1263 if (!mod_timer(timer
, jiffies
+ timeout
))
1264 sctp_association_hold(asoc
);
1267 case SCTP_CMD_TIMER_STOP
:
1268 timer
= &asoc
->timers
[cmd
->obj
.to
];
1269 if (timer_pending(timer
) && del_timer(timer
))
1270 sctp_association_put(asoc
);
1273 case SCTP_CMD_INIT_CHOOSE_TRANSPORT
:
1274 chunk
= cmd
->obj
.ptr
;
1275 t
= sctp_assoc_choose_init_transport(asoc
);
1276 asoc
->init_last_sent_to
= t
;
1277 chunk
->transport
= t
;
1278 t
->init_sent_count
++;
1281 case SCTP_CMD_INIT_RESTART
:
1282 /* Do the needed accounting and updates
1283 * associated with restarting an initialization
1284 * timer. Only multiply the timeout by two if
1285 * all transports have been tried at the current
1288 t
= asoc
->init_last_sent_to
;
1289 asoc
->init_err_counter
++;
1291 if (t
->init_sent_count
> (asoc
->init_cycle
+ 1)) {
1292 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] *= 2;
1293 if (asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] >
1294 asoc
->max_init_timeo
) {
1295 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
] =
1296 asoc
->max_init_timeo
;
1300 "T1 INIT Timeout adjustment"
1301 " init_err_counter: %d"
1304 asoc
->init_err_counter
,
1306 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_INIT
]);
1309 sctp_add_cmd_sf(commands
, SCTP_CMD_TIMER_RESTART
,
1310 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT
));
1313 case SCTP_CMD_COOKIEECHO_RESTART
:
1314 /* Do the needed accounting and updates
1315 * associated with restarting an initialization
1316 * timer. Only multiply the timeout by two if
1317 * all transports have been tried at the current
1320 asoc
->init_err_counter
++;
1322 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] *= 2;
1323 if (asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] >
1324 asoc
->max_init_timeo
) {
1325 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
] =
1326 asoc
->max_init_timeo
;
1329 "T1 COOKIE Timeout adjustment"
1330 " init_err_counter: %d"
1332 asoc
->init_err_counter
,
1333 asoc
->timeouts
[SCTP_EVENT_TIMEOUT_T1_COOKIE
]);
1335 /* If we've sent any data bundled with
1336 * COOKIE-ECHO we need to resend.
1338 list_for_each(pos
, &asoc
->peer
.transport_addr_list
) {
1339 t
= list_entry(pos
, struct sctp_transport
,
1341 sctp_retransmit_mark(&asoc
->outqueue
, t
, 0);
1344 sctp_add_cmd_sf(commands
,
1345 SCTP_CMD_TIMER_RESTART
,
1346 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE
));
1349 case SCTP_CMD_INIT_FAILED
:
1350 sctp_cmd_init_failed(commands
, asoc
, cmd
->obj
.u32
);
1353 case SCTP_CMD_ASSOC_FAILED
:
1354 sctp_cmd_assoc_failed(commands
, asoc
, event_type
,
1355 subtype
, chunk
, cmd
->obj
.u32
);
1358 case SCTP_CMD_INIT_COUNTER_INC
:
1359 asoc
->init_err_counter
++;
1362 case SCTP_CMD_INIT_COUNTER_RESET
:
1363 asoc
->init_err_counter
= 0;
1364 asoc
->init_cycle
= 0;
1367 case SCTP_CMD_REPORT_DUP
:
1368 sctp_tsnmap_mark_dup(&asoc
->peer
.tsn_map
,
1372 case SCTP_CMD_REPORT_BAD_TAG
:
1373 SCTP_DEBUG_PRINTK("vtag mismatch!\n");
1376 case SCTP_CMD_STRIKE
:
1377 /* Mark one strike against a transport. */
1378 sctp_do_8_2_transport_strike(asoc
, cmd
->obj
.transport
);
1381 case SCTP_CMD_TRANSPORT_RESET
:
1382 t
= cmd
->obj
.transport
;
1383 sctp_cmd_transport_reset(commands
, asoc
, t
);
1386 case SCTP_CMD_TRANSPORT_ON
:
1387 t
= cmd
->obj
.transport
;
1388 sctp_cmd_transport_on(commands
, asoc
, t
, chunk
);
1391 case SCTP_CMD_HB_TIMERS_START
:
1392 sctp_cmd_hb_timers_start(commands
, asoc
);
1395 case SCTP_CMD_HB_TIMER_UPDATE
:
1396 t
= cmd
->obj
.transport
;
1397 sctp_cmd_hb_timer_update(commands
, asoc
, t
);
1400 case SCTP_CMD_HB_TIMERS_STOP
:
1401 sctp_cmd_hb_timers_stop(commands
, asoc
);
1404 case SCTP_CMD_REPORT_ERROR
:
1405 error
= cmd
->obj
.error
;
1408 case SCTP_CMD_PROCESS_CTSN
:
1409 /* Dummy up a SACK for processing. */
1410 sackh
.cum_tsn_ack
= cmd
->obj
.u32
;
1412 sackh
.num_gap_ack_blocks
= 0;
1413 sackh
.num_dup_tsns
= 0;
1414 sctp_add_cmd_sf(commands
, SCTP_CMD_PROCESS_SACK
,
1415 SCTP_SACKH(&sackh
));
1418 case SCTP_CMD_DISCARD_PACKET
:
1419 /* We need to discard the whole packet. */
1420 chunk
->pdiscard
= 1;
1423 case SCTP_CMD_RTO_PENDING
:
1424 t
= cmd
->obj
.transport
;
1428 case SCTP_CMD_PART_DELIVER
:
1429 sctp_ulpq_partial_delivery(&asoc
->ulpq
, cmd
->obj
.ptr
,
1433 case SCTP_CMD_RENEGE
:
1434 sctp_ulpq_renege(&asoc
->ulpq
, cmd
->obj
.ptr
,
1438 case SCTP_CMD_SETUP_T4
:
1439 sctp_cmd_setup_t4(commands
, asoc
, cmd
->obj
.ptr
);
1442 case SCTP_CMD_PROCESS_OPERR
:
1443 sctp_cmd_process_operr(commands
, asoc
, chunk
);
1445 case SCTP_CMD_CLEAR_INIT_TAG
:
1446 asoc
->peer
.i
.init_tag
= 0;
1448 case SCTP_CMD_DEL_NON_PRIMARY
:
1449 sctp_cmd_del_non_primary(asoc
);
1451 case SCTP_CMD_T3_RTX_TIMERS_STOP
:
1452 sctp_cmd_t3_rtx_timers_stop(commands
, asoc
);
1454 case SCTP_CMD_FORCE_PRIM_RETRAN
:
1455 t
= asoc
->peer
.retran_path
;
1456 asoc
->peer
.retran_path
= asoc
->peer
.primary_path
;
1457 error
= sctp_outq_uncork(&asoc
->outqueue
);
1459 asoc
->peer
.retran_path
= t
;
1462 printk(KERN_WARNING
"Impossible command: %u, %p\n",
1463 cmd
->verb
, cmd
->obj
.ptr
);
1472 sctp_outq_uncork(&asoc
->outqueue
);