1 /* BGP-4 Finite State Machine
2 From RFC1771 [A Border Gateway Protocol 4 (BGP-4)]
3 Copyright (C) 1996, 97, 98 Kunihiro Ishiguro
5 This file is part of GNU Zebra.
7 GNU Zebra is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 2, or (at your option) any
12 GNU Zebra is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU Zebra; see the file COPYING. If not, write to the Free
19 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
27 #include "sockunion.h"
34 #include "bgpd/bgpd.h"
35 #include "bgpd/bgp_attr.h"
36 #include "bgpd/bgp_debug.h"
37 #include "bgpd/bgp_fsm.h"
38 #include "bgpd/bgp_packet.h"
39 #include "bgpd/bgp_network.h"
40 #include "bgpd/bgp_route.h"
41 #include "bgpd/bgp_dump.h"
42 #include "bgpd/bgp_open.h"
44 #include "bgpd/bgp_snmp.h"
45 #endif /* HAVE_SNMP */
47 /* BGP FSM (finite state machine) has three types of functions. Type
48 one is thread functions. Type two is event functions. Type three
49 is FSM functions. Timer functions are set by bgp_timer_set
52 /* BGP event function. */
53 int bgp_event (struct thread
*);
55 /* BGP thread functions. */
56 static int bgp_start_timer (struct thread
*);
57 static int bgp_connect_timer (struct thread
*);
58 static int bgp_holdtime_timer (struct thread
*);
59 static int bgp_keepalive_timer (struct thread
*);
61 /* BGP FSM functions. */
62 static int bgp_start (struct peer
*);
64 /* BGP start timer jitter. */
66 bgp_start_jitter (int time
)
68 return ((rand () % (time
+ 1)) - (time
/ 2));
71 /* Hook function called after bgp event is occered. And vty's
72 neighbor command invoke this function after making neighbor
75 bgp_timer_set (struct peer
*peer
)
82 /* First entry point of peer's finite state machine. In Idle
83 status start timer is on unless peer is shutdown or peer is
84 inactive. All other timer must be turned off */
85 if (CHECK_FLAG (peer
->flags
, PEER_FLAG_SHUTDOWN
)
86 || CHECK_FLAG (peer
->sflags
, PEER_STATUS_PREFIX_OVERFLOW
)
87 || ! peer_active (peer
))
89 BGP_TIMER_OFF (peer
->t_start
);
93 jitter
= bgp_start_jitter (peer
->v_start
);
94 BGP_TIMER_ON (peer
->t_start
, bgp_start_timer
,
95 peer
->v_start
+ jitter
);
97 BGP_TIMER_OFF (peer
->t_connect
);
98 BGP_TIMER_OFF (peer
->t_holdtime
);
99 BGP_TIMER_OFF (peer
->t_keepalive
);
100 BGP_TIMER_OFF (peer
->t_asorig
);
101 BGP_TIMER_OFF (peer
->t_routeadv
);
105 /* After start timer is expired, the peer moves to Connnect
106 status. Make sure start timer is off and connect timer is
108 BGP_TIMER_OFF (peer
->t_start
);
109 BGP_TIMER_ON (peer
->t_connect
, bgp_connect_timer
, peer
->v_connect
);
110 BGP_TIMER_OFF (peer
->t_holdtime
);
111 BGP_TIMER_OFF (peer
->t_keepalive
);
112 BGP_TIMER_OFF (peer
->t_asorig
);
113 BGP_TIMER_OFF (peer
->t_routeadv
);
117 /* Active is waiting connection from remote peer. And if
118 connect timer is expired, change status to Connect. */
119 BGP_TIMER_OFF (peer
->t_start
);
120 /* If peer is passive mode, do not set connect timer. */
121 if (CHECK_FLAG (peer
->flags
, PEER_FLAG_PASSIVE
))
123 BGP_TIMER_OFF (peer
->t_connect
);
127 BGP_TIMER_ON (peer
->t_connect
, bgp_connect_timer
, peer
->v_connect
);
129 BGP_TIMER_OFF (peer
->t_holdtime
);
130 BGP_TIMER_OFF (peer
->t_keepalive
);
131 BGP_TIMER_OFF (peer
->t_asorig
);
132 BGP_TIMER_OFF (peer
->t_routeadv
);
136 /* OpenSent status. */
137 BGP_TIMER_OFF (peer
->t_start
);
138 BGP_TIMER_OFF (peer
->t_connect
);
139 if (peer
->v_holdtime
!= 0)
141 BGP_TIMER_ON (peer
->t_holdtime
, bgp_holdtime_timer
,
146 BGP_TIMER_OFF (peer
->t_holdtime
);
148 BGP_TIMER_OFF (peer
->t_keepalive
);
149 BGP_TIMER_OFF (peer
->t_asorig
);
150 BGP_TIMER_OFF (peer
->t_routeadv
);
154 /* OpenConfirm status. */
155 BGP_TIMER_OFF (peer
->t_start
);
156 BGP_TIMER_OFF (peer
->t_connect
);
158 /* If the negotiated Hold Time value is zero, then the Hold Time
159 timer and KeepAlive timers are not started. */
160 if (peer
->v_holdtime
== 0)
162 BGP_TIMER_OFF (peer
->t_holdtime
);
163 BGP_TIMER_OFF (peer
->t_keepalive
);
167 BGP_TIMER_ON (peer
->t_holdtime
, bgp_holdtime_timer
,
169 BGP_TIMER_ON (peer
->t_keepalive
, bgp_keepalive_timer
,
172 BGP_TIMER_OFF (peer
->t_asorig
);
173 BGP_TIMER_OFF (peer
->t_routeadv
);
177 /* In Established status start and connect timer is turned
179 BGP_TIMER_OFF (peer
->t_start
);
180 BGP_TIMER_OFF (peer
->t_connect
);
182 /* Same as OpenConfirm, if holdtime is zero then both holdtime
183 and keepalive must be turned off. */
184 if (peer
->v_holdtime
== 0)
186 BGP_TIMER_OFF (peer
->t_holdtime
);
187 BGP_TIMER_OFF (peer
->t_keepalive
);
191 BGP_TIMER_ON (peer
->t_holdtime
, bgp_holdtime_timer
,
193 BGP_TIMER_ON (peer
->t_keepalive
, bgp_keepalive_timer
,
196 BGP_TIMER_OFF (peer
->t_asorig
);
201 /* BGP start timer. This function set BGP_Start event to thread value
202 and process event. */
204 bgp_start_timer (struct thread
*thread
)
208 peer
= THREAD_ARG (thread
);
209 peer
->t_start
= NULL
;
211 if (BGP_DEBUG (fsm
, FSM
))
212 zlog (peer
->log
, LOG_DEBUG
,
213 "%s [FSM] Timer (start timer expire).", peer
->host
);
215 THREAD_VAL (thread
) = BGP_Start
;
221 /* BGP connect retry timer. */
223 bgp_connect_timer (struct thread
*thread
)
227 peer
= THREAD_ARG (thread
);
228 peer
->t_connect
= NULL
;
230 if (BGP_DEBUG (fsm
, FSM
))
231 zlog (peer
->log
, LOG_DEBUG
, "%s [FSM] Timer (connect timer expire)",
234 THREAD_VAL (thread
) = ConnectRetry_timer_expired
;
240 /* BGP holdtime timer. */
242 bgp_holdtime_timer (struct thread
*thread
)
246 peer
= THREAD_ARG (thread
);
247 peer
->t_holdtime
= NULL
;
249 if (BGP_DEBUG (fsm
, FSM
))
250 zlog (peer
->log
, LOG_DEBUG
,
251 "%s [FSM] Timer (holdtime timer expire)",
254 THREAD_VAL (thread
) = Hold_Timer_expired
;
260 /* BGP keepalive fire ! */
262 bgp_keepalive_timer (struct thread
*thread
)
266 peer
= THREAD_ARG (thread
);
267 peer
->t_keepalive
= NULL
;
269 if (BGP_DEBUG (fsm
, FSM
))
270 zlog (peer
->log
, LOG_DEBUG
,
271 "%s [FSM] Timer (keepalive timer expire)",
274 THREAD_VAL (thread
) = KeepAlive_timer_expired
;
281 bgp_routeadv_timer (struct thread
*thread
)
285 peer
= THREAD_ARG (thread
);
286 peer
->t_routeadv
= NULL
;
288 if (BGP_DEBUG (fsm
, FSM
))
289 zlog (peer
->log
, LOG_DEBUG
,
290 "%s [FSM] Timer (routeadv timer expire)",
293 peer
->synctime
= time (NULL
);
295 BGP_WRITE_ON (peer
->t_write
, bgp_write
, peer
->fd
);
297 BGP_TIMER_ON (peer
->t_routeadv
, bgp_routeadv_timer
,
303 /* Reset bgp update timer */
305 bgp_uptime_reset (struct peer
*peer
)
307 peer
->uptime
= time (NULL
);
310 /* BGP Peer Down Cause */
311 const char *peer_down_str
[] =
317 "Cluster ID changed",
318 "Confederation identifier changed",
319 "Confederation peer changed",
320 "RR client config change",
321 "RS client config change",
322 "Update source change",
323 "Address family activated",
326 "BGP Notification received",
327 "BGP Notification send",
328 "Peer closed the session",
330 "Peer-group add member",
331 "Peer-group delete member",
332 "Capability changed",
333 "Passive config change",
334 "Multihop config change"
337 /* Administrative BGP peer stop event. */
339 bgp_stop (struct peer
*peer
)
343 char orf_name
[BUFSIZ
];
345 /* Increment Dropped count. */
346 if (peer
->status
== Established
)
349 bgp_fsm_change_status (peer
, Idle
);
351 /* bgp log-neighbor-changes of neighbor Down */
352 if (bgp_flag_check (peer
->bgp
, BGP_FLAG_LOG_NEIGHBOR_CHANGES
))
353 zlog_info ("%%ADJCHANGE: neighbor %s Down %s", peer
->host
,
354 peer_down_str
[(int) peer
->last_reset
]);
356 /* set last reset time */
357 peer
->resettime
= time (NULL
);
359 bgp_uptime_reset (peer
);
362 bgpTrapBackwardTransition (peer
);
363 #endif /* HAVE_SNMP */
366 bgp_uptime_reset (peer
);
368 /* Need of clear of peer. */
369 bgp_clear_route_all (peer
);
372 /* Stop read and write threads when exists. */
373 BGP_READ_OFF (peer
->t_read
);
374 BGP_WRITE_OFF (peer
->t_write
);
376 /* Stop all timers. */
377 BGP_TIMER_OFF (peer
->t_start
);
378 BGP_TIMER_OFF (peer
->t_connect
);
379 BGP_TIMER_OFF (peer
->t_holdtime
);
380 BGP_TIMER_OFF (peer
->t_keepalive
);
381 BGP_TIMER_OFF (peer
->t_asorig
);
382 BGP_TIMER_OFF (peer
->t_routeadv
);
384 /* Delete all existing events of the peer. */
385 BGP_EVENT_DELETE (peer
);
388 peer
->packet_size
= 0;
390 /* Clear input and output buffer. */
392 stream_reset (peer
->ibuf
);
394 stream_reset (peer
->work
);
395 stream_fifo_clean (peer
->obuf
);
397 /* Close of file descriptor. */
404 /* Connection information. */
407 XFREE (MTYPE_SOCKUNION
, peer
->su_local
);
408 peer
->su_local
= NULL
;
413 XFREE (MTYPE_SOCKUNION
, peer
->su_remote
);
414 peer
->su_remote
= NULL
;
417 /* Clear remote router-id. */
418 peer
->remote_id
.s_addr
= 0;
420 /* Clear peer capability flag. */
423 for (afi
= AFI_IP
; afi
< AFI_MAX
; afi
++)
424 for (safi
= SAFI_UNICAST
; safi
< SAFI_MAX
; safi
++)
426 /* Reset all negotiated variables */
427 peer
->afc_nego
[afi
][safi
] = 0;
428 peer
->afc_adv
[afi
][safi
] = 0;
429 peer
->afc_recv
[afi
][safi
] = 0;
431 /* peer address family capability flags*/
432 peer
->af_cap
[afi
][safi
] = 0;
434 /* peer address family status flags*/
435 peer
->af_sflags
[afi
][safi
] = 0;
437 /* Received ORF prefix-filter */
438 peer
->orf_plist
[afi
][safi
] = NULL
;
440 /* ORF received prefix-filter pnt */
441 sprintf (orf_name
, "%s.%d.%d", peer
->host
, afi
, safi
);
442 prefix_bgp_orf_remove_all (orf_name
);
445 /* Reset keepalive and holdtime */
446 if (CHECK_FLAG (peer
->config
, PEER_CONFIG_TIMER
))
448 peer
->v_keepalive
= peer
->keepalive
;
449 peer
->v_holdtime
= peer
->holdtime
;
453 peer
->v_keepalive
= peer
->bgp
->default_keepalive
;
454 peer
->v_holdtime
= peer
->bgp
->default_holdtime
;
457 peer
->update_time
= 0;
459 /* Until we are sure that there is no problem about prefix count
460 this should be commented out.*/
462 /* Reset prefix count */
463 peer
->pcount
[AFI_IP
][SAFI_UNICAST
] = 0;
464 peer
->pcount
[AFI_IP
][SAFI_MULTICAST
] = 0;
465 peer
->pcount
[AFI_IP
][SAFI_MPLS_VPN
] = 0;
466 peer
->pcount
[AFI_IP6
][SAFI_UNICAST
] = 0;
467 peer
->pcount
[AFI_IP6
][SAFI_MULTICAST
] = 0;
473 /* BGP peer is stoped by the error. */
475 bgp_stop_with_error (struct peer
*peer
)
477 /* Double start timer. */
480 /* Overflow check. */
481 if (peer
->v_start
>= (60 * 2))
482 peer
->v_start
= (60 * 2);
489 /* TCP connection open. Next we send open message to remote peer. And
490 add read thread for reading open message. */
492 bgp_connect_success (struct peer
*peer
)
496 zlog_err ("bgp_connect_success peer's fd is negative value %d",
500 BGP_READ_ON (peer
->t_read
, bgp_read
, peer
->fd
);
502 /* bgp_getsockname (peer); */
504 if (! CHECK_FLAG (peer
->sflags
, PEER_STATUS_ACCEPT_PEER
))
505 bgp_open_send (peer
);
510 /* TCP connect fail */
512 bgp_connect_fail (struct peer
*peer
)
518 /* This function is the first starting point of all BGP connection. It
519 try to connect to remote peer with non-blocking IO. */
521 bgp_start (struct peer
*peer
)
525 /* If the peer is passive mode, force to move to Active mode. */
526 if (CHECK_FLAG (peer
->flags
, PEER_FLAG_PASSIVE
))
528 BGP_EVENT_ADD (peer
, TCP_connection_open_failed
);
532 status
= bgp_connect (peer
);
537 if (BGP_DEBUG (fsm
, FSM
))
538 plog_info (peer
->log
, "%s [FSM] Connect error", peer
->host
);
539 BGP_EVENT_ADD (peer
, TCP_connection_open_failed
);
541 case connect_success
:
542 if (BGP_DEBUG (fsm
, FSM
))
543 plog_info (peer
->log
, "%s [FSM] Connect immediately success",
545 BGP_EVENT_ADD (peer
, TCP_connection_open
);
547 case connect_in_progress
:
548 /* To check nonblocking connect, we wait until socket is
549 readable or writable. */
550 if (BGP_DEBUG (fsm
, FSM
))
551 plog_info (peer
->log
, "%s [FSM] Non blocking connect waiting result",
555 zlog_err ("bgp_start peer's fd is negative value %d",
559 BGP_READ_ON (peer
->t_read
, bgp_read
, peer
->fd
);
560 BGP_WRITE_ON (peer
->t_write
, bgp_write
, peer
->fd
);
566 /* Connect retry timer is expired when the peer status is Connect. */
568 bgp_reconnect (struct peer
*peer
)
576 bgp_fsm_open (struct peer
*peer
)
578 /* Send keepalive and make keepalive timer */
579 bgp_keepalive_send (peer
);
581 /* Reset holdtimer value. */
582 BGP_TIMER_OFF (peer
->t_holdtime
);
587 /* Called after event occured, this function change status and reset
588 read/write and timer thread. */
590 bgp_fsm_change_status (struct peer
*peer
, int status
)
592 bgp_dump_state (peer
, peer
->status
, status
);
594 /* Preserve old status and change into new status. */
595 peer
->ostatus
= peer
->status
;
596 peer
->status
= status
;
599 /* Keepalive send to peer. */
601 bgp_fsm_keepalive_expire (struct peer
*peer
)
603 bgp_keepalive_send (peer
);
607 /* Hold timer expire. This is error of BGP connection. So cut the
608 peer and change to Idle status. */
610 bgp_fsm_holdtime_expire (struct peer
*peer
)
612 if (BGP_DEBUG (fsm
, FSM
))
613 zlog (peer
->log
, LOG_DEBUG
, "%s [FSM] Hold timer expire", peer
->host
);
615 /* Send notify to remote peer. */
616 bgp_notify_send (peer
, BGP_NOTIFY_HOLD_ERR
, 0);
618 /* Sweep if it is temporary peer. */
619 if (CHECK_FLAG (peer
->sflags
, PEER_STATUS_ACCEPT_PEER
))
621 zlog_info ("%s [Event] Accepting BGP peer is deleted", peer
->host
);
629 /* Status goes to Established. Send keepalive packet then make first
630 update information. */
632 bgp_establish (struct peer
*peer
)
634 struct bgp_notify
*notify
;
638 /* Reset capability open status flag. */
639 if (! CHECK_FLAG (peer
->sflags
, PEER_STATUS_CAPABILITY_OPEN
))
640 SET_FLAG (peer
->sflags
, PEER_STATUS_CAPABILITY_OPEN
);
642 /* Clear last notification data. */
643 notify
= &peer
->notify
;
645 XFREE (MTYPE_TMP
, notify
->data
);
646 memset (notify
, 0, sizeof (struct bgp_notify
));
648 /* Clear start timer value to default. */
649 peer
->v_start
= BGP_INIT_START_TIMER
;
651 /* Increment established count. */
653 bgp_fsm_change_status (peer
, Established
);
655 /* bgp log-neighbor-changes of neighbor Up */
656 if (bgp_flag_check (peer
->bgp
, BGP_FLAG_LOG_NEIGHBOR_CHANGES
))
657 zlog_info ("%%ADJCHANGE: neighbor %s Up", peer
->host
);
660 bgpTrapEstablished (peer
);
661 #endif /* HAVE_SNMP */
663 /* Reset uptime, send keepalive, send current table. */
664 bgp_uptime_reset (peer
);
666 /* Send route-refresh when ORF is enabled */
667 for (afi
= AFI_IP
; afi
< AFI_MAX
; afi
++)
668 for (safi
= SAFI_UNICAST
; safi
< SAFI_MAX
; safi
++)
669 if (CHECK_FLAG (peer
->af_cap
[afi
][safi
], PEER_CAP_ORF_PREFIX_SM_ADV
))
671 if (CHECK_FLAG (peer
->af_cap
[afi
][safi
], PEER_CAP_ORF_PREFIX_RM_RCV
))
672 bgp_route_refresh_send (peer
, afi
, safi
, ORF_TYPE_PREFIX
,
673 REFRESH_IMMEDIATE
, 0);
674 else if (CHECK_FLAG (peer
->af_cap
[afi
][safi
], PEER_CAP_ORF_PREFIX_RM_OLD_RCV
))
675 bgp_route_refresh_send (peer
, afi
, safi
, ORF_TYPE_PREFIX_OLD
,
676 REFRESH_IMMEDIATE
, 0);
679 if (peer
->v_keepalive
)
680 bgp_keepalive_send (peer
);
682 /* First update is deferred until ORF or ROUTE-REFRESH is received */
683 for (afi
= AFI_IP
; afi
< AFI_MAX
; afi
++)
684 for (safi
= SAFI_UNICAST
; safi
< SAFI_MAX
; safi
++)
685 if (CHECK_FLAG (peer
->af_cap
[afi
][safi
], PEER_CAP_ORF_PREFIX_RM_ADV
))
686 if (CHECK_FLAG (peer
->af_cap
[afi
][safi
], PEER_CAP_ORF_PREFIX_SM_RCV
)
687 || CHECK_FLAG (peer
->af_cap
[afi
][safi
], PEER_CAP_ORF_PREFIX_SM_OLD_RCV
))
688 SET_FLAG (peer
->af_sflags
[afi
][safi
], PEER_STATUS_ORF_WAIT_REFRESH
);
690 bgp_announce_route_all (peer
);
692 BGP_TIMER_ON (peer
->t_routeadv
, bgp_routeadv_timer
, 1);
697 /* Keepalive packet is received. */
699 bgp_fsm_keepalive (struct peer
*peer
)
701 /* peer count update */
702 peer
->keepalive_in
++;
704 BGP_TIMER_OFF (peer
->t_holdtime
);
708 /* Update packet is received. */
710 bgp_fsm_update (struct peer
*peer
)
712 BGP_TIMER_OFF (peer
->t_holdtime
);
716 /* This is empty event. */
718 bgp_ignore (struct peer
*peer
)
720 if (BGP_DEBUG (fsm
, FSM
))
721 zlog (peer
->log
, LOG_DEBUG
, "%s [FSM] bgp_ignore called", peer
->host
);
725 /* Finite State Machine structure */
729 } FSM
[BGP_STATUS_MAX
- 1][BGP_EVENTS_MAX
- 1] =
732 /* Idle state: In Idle state, all events other than BGP_Start is
733 ignored. With BGP_Start event, finite state machine calls
735 {bgp_start
, Connect
}, /* BGP_Start */
736 {bgp_stop
, Idle
}, /* BGP_Stop */
737 {bgp_stop
, Idle
}, /* TCP_connection_open */
738 {bgp_stop
, Idle
}, /* TCP_connection_closed */
739 {bgp_ignore
, Idle
}, /* TCP_connection_open_failed */
740 {bgp_stop
, Idle
}, /* TCP_fatal_error */
741 {bgp_ignore
, Idle
}, /* ConnectRetry_timer_expired */
742 {bgp_ignore
, Idle
}, /* Hold_Timer_expired */
743 {bgp_ignore
, Idle
}, /* KeepAlive_timer_expired */
744 {bgp_ignore
, Idle
}, /* Receive_OPEN_message */
745 {bgp_ignore
, Idle
}, /* Receive_KEEPALIVE_message */
746 {bgp_ignore
, Idle
}, /* Receive_UPDATE_message */
747 {bgp_ignore
, Idle
}, /* Receive_NOTIFICATION_message */
751 {bgp_ignore
, Connect
}, /* BGP_Start */
752 {bgp_stop
, Idle
}, /* BGP_Stop */
753 {bgp_connect_success
, OpenSent
}, /* TCP_connection_open */
754 {bgp_stop
, Idle
}, /* TCP_connection_closed */
755 {bgp_connect_fail
, Active
}, /* TCP_connection_open_failed */
756 {bgp_connect_fail
, Idle
}, /* TCP_fatal_error */
757 {bgp_reconnect
, Connect
}, /* ConnectRetry_timer_expired */
758 {bgp_ignore
, Idle
}, /* Hold_Timer_expired */
759 {bgp_ignore
, Idle
}, /* KeepAlive_timer_expired */
760 {bgp_ignore
, Idle
}, /* Receive_OPEN_message */
761 {bgp_ignore
, Idle
}, /* Receive_KEEPALIVE_message */
762 {bgp_ignore
, Idle
}, /* Receive_UPDATE_message */
763 {bgp_stop
, Idle
}, /* Receive_NOTIFICATION_message */
767 {bgp_ignore
, Active
}, /* BGP_Start */
768 {bgp_stop
, Idle
}, /* BGP_Stop */
769 {bgp_connect_success
, OpenSent
}, /* TCP_connection_open */
770 {bgp_stop
, Idle
}, /* TCP_connection_closed */
771 {bgp_ignore
, Active
}, /* TCP_connection_open_failed */
772 {bgp_ignore
, Idle
}, /* TCP_fatal_error */
773 {bgp_start
, Connect
}, /* ConnectRetry_timer_expired */
774 {bgp_ignore
, Idle
}, /* Hold_Timer_expired */
775 {bgp_ignore
, Idle
}, /* KeepAlive_timer_expired */
776 {bgp_ignore
, Idle
}, /* Receive_OPEN_message */
777 {bgp_ignore
, Idle
}, /* Receive_KEEPALIVE_message */
778 {bgp_ignore
, Idle
}, /* Receive_UPDATE_message */
779 {bgp_stop_with_error
, Idle
}, /* Receive_NOTIFICATION_message */
783 {bgp_ignore
, OpenSent
}, /* BGP_Start */
784 {bgp_stop
, Idle
}, /* BGP_Stop */
785 {bgp_stop
, Idle
}, /* TCP_connection_open */
786 {bgp_stop
, Active
}, /* TCP_connection_closed */
787 {bgp_ignore
, Idle
}, /* TCP_connection_open_failed */
788 {bgp_stop
, Idle
}, /* TCP_fatal_error */
789 {bgp_ignore
, Idle
}, /* ConnectRetry_timer_expired */
790 {bgp_fsm_holdtime_expire
, Idle
}, /* Hold_Timer_expired */
791 {bgp_ignore
, Idle
}, /* KeepAlive_timer_expired */
792 {bgp_fsm_open
, OpenConfirm
}, /* Receive_OPEN_message */
793 {bgp_ignore
, Idle
}, /* Receive_KEEPALIVE_message */
794 {bgp_ignore
, Idle
}, /* Receive_UPDATE_message */
795 {bgp_stop_with_error
, Idle
}, /* Receive_NOTIFICATION_message */
799 {bgp_ignore
, OpenConfirm
}, /* BGP_Start */
800 {bgp_stop
, Idle
}, /* BGP_Stop */
801 {bgp_stop
, Idle
}, /* TCP_connection_open */
802 {bgp_stop
, Idle
}, /* TCP_connection_closed */
803 {bgp_stop
, Idle
}, /* TCP_connection_open_failed */
804 {bgp_stop
, Idle
}, /* TCP_fatal_error */
805 {bgp_ignore
, Idle
}, /* ConnectRetry_timer_expired */
806 {bgp_fsm_holdtime_expire
, Idle
}, /* Hold_Timer_expired */
807 {bgp_ignore
, OpenConfirm
}, /* KeepAlive_timer_expired */
808 {bgp_ignore
, Idle
}, /* Receive_OPEN_message */
809 {bgp_establish
, Established
}, /* Receive_KEEPALIVE_message */
810 {bgp_ignore
, Idle
}, /* Receive_UPDATE_message */
811 {bgp_stop_with_error
, Idle
}, /* Receive_NOTIFICATION_message */
815 {bgp_ignore
, Established
}, /* BGP_Start */
816 {bgp_stop
, Idle
}, /* BGP_Stop */
817 {bgp_stop
, Idle
}, /* TCP_connection_open */
818 {bgp_stop
, Idle
}, /* TCP_connection_closed */
819 {bgp_ignore
, Idle
}, /* TCP_connection_open_failed */
820 {bgp_stop
, Idle
}, /* TCP_fatal_error */
821 {bgp_ignore
, Idle
}, /* ConnectRetry_timer_expired */
822 {bgp_fsm_holdtime_expire
, Idle
}, /* Hold_Timer_expired */
823 {bgp_fsm_keepalive_expire
, Established
}, /* KeepAlive_timer_expired */
824 {bgp_stop
, Idle
}, /* Receive_OPEN_message */
825 {bgp_fsm_keepalive
, Established
}, /* Receive_KEEPALIVE_message */
826 {bgp_fsm_update
, Established
}, /* Receive_UPDATE_message */
827 {bgp_stop_with_error
, Idle
}, /* Receive_NOTIFICATION_message */
831 static const char *bgp_event_str
[] =
836 "TCP_connection_open",
837 "TCP_connection_closed",
838 "TCP_connection_open_failed",
840 "ConnectRetry_timer_expired",
841 "Hold_Timer_expired",
842 "KeepAlive_timer_expired",
843 "Receive_OPEN_message",
844 "Receive_KEEPALIVE_message",
845 "Receive_UPDATE_message",
846 "Receive_NOTIFICATION_message"
849 /* Execute event process. */
851 bgp_event (struct thread
*thread
)
858 peer
= THREAD_ARG (thread
);
859 event
= THREAD_VAL (thread
);
861 /* Logging this event. */
862 next
= FSM
[peer
->status
-1][event
- 1].next_state
;
864 if (BGP_DEBUG (fsm
, FSM
))
865 plog_info (peer
->log
, "%s [FSM] %s (%s->%s)", peer
->host
,
866 bgp_event_str
[event
],
867 LOOKUP (bgp_status_msg
, peer
->status
),
868 LOOKUP (bgp_status_msg
, next
));
869 if (BGP_DEBUG (normal
, NORMAL
)
870 && strcmp (LOOKUP (bgp_status_msg
, peer
->status
), LOOKUP (bgp_status_msg
, next
)))
871 zlog_info ("%s went from %s to %s",
873 LOOKUP (bgp_status_msg
, peer
->status
),
874 LOOKUP (bgp_status_msg
, next
));
877 ret
= (*(FSM
[peer
->status
- 1][event
- 1].func
))(peer
);
879 /* When function do not want proceed next job return -1. */
883 /* If status is changed. */
884 if (next
!= peer
->status
)
885 bgp_fsm_change_status (peer
, next
);
887 /* Make sure timer is set. */
888 bgp_timer_set (peer
);