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 along
18 * with this program; see the file COPYING; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
26 #include "sockunion.h"
33 #include "workqueue.h"
37 #include "lib_errors.h"
40 #include "bgpd/bgpd.h"
41 #include "bgpd/bgp_attr.h"
42 #include "bgpd/bgp_debug.h"
43 #include "bgpd/bgp_errors.h"
44 #include "bgpd/bgp_fsm.h"
45 #include "bgpd/bgp_packet.h"
46 #include "bgpd/bgp_network.h"
47 #include "bgpd/bgp_route.h"
48 #include "bgpd/bgp_dump.h"
49 #include "bgpd/bgp_open.h"
50 #include "bgpd/bgp_advertise.h"
51 #include "bgpd/bgp_updgrp.h"
52 #include "bgpd/bgp_nht.h"
53 #include "bgpd/bgp_bfd.h"
54 #include "bgpd/bgp_memory.h"
55 #include "bgpd/bgp_keepalives.h"
56 #include "bgpd/bgp_io.h"
57 #include "bgpd/bgp_zebra.h"
59 DEFINE_HOOK(peer_backward_transition
, (struct peer
* peer
), (peer
))
60 DEFINE_HOOK(peer_established
, (struct peer
* peer
), (peer
))
62 /* Definition of display strings corresponding to FSM events. This should be
63 * kept consistent with the events defined in bgpd.h
65 static const char *bgp_event_str
[] = {
69 "TCP_connection_open",
70 "TCP_connection_closed",
71 "TCP_connection_open_failed",
73 "ConnectRetry_timer_expired",
75 "KeepAlive_timer_expired",
76 "Receive_OPEN_message",
77 "Receive_KEEPALIVE_message",
78 "Receive_UPDATE_message",
79 "Receive_NOTIFICATION_message",
83 /* BGP FSM (finite state machine) has three types of functions. Type
84 one is thread functions. Type two is event functions. Type three
85 is FSM functions. Timer functions are set by bgp_timer_set
88 /* BGP event function. */
89 int bgp_event(struct thread
*);
91 /* BGP thread functions. */
92 static int bgp_start_timer(struct thread
*);
93 static int bgp_connect_timer(struct thread
*);
94 static int bgp_holdtime_timer(struct thread
*);
96 /* BGP FSM functions. */
97 static int bgp_start(struct peer
*);
99 static void peer_xfer_stats(struct peer
*peer_dst
, struct peer
*peer_src
)
101 /* Copy stats over. These are only the pre-established state stats */
102 peer_dst
->open_in
+= peer_src
->open_in
;
103 peer_dst
->open_out
+= peer_src
->open_out
;
104 peer_dst
->keepalive_in
+= peer_src
->keepalive_in
;
105 peer_dst
->keepalive_out
+= peer_src
->keepalive_out
;
106 peer_dst
->notify_in
+= peer_src
->notify_in
;
107 peer_dst
->notify_out
+= peer_src
->notify_out
;
108 peer_dst
->dynamic_cap_in
+= peer_src
->dynamic_cap_in
;
109 peer_dst
->dynamic_cap_out
+= peer_src
->dynamic_cap_out
;
112 static struct peer
*peer_xfer_conn(struct peer
*from_peer
)
119 unsigned char last_evt
, last_maj_evt
;
121 assert(from_peer
!= NULL
);
123 peer
= from_peer
->doppelganger
;
125 if (!peer
|| !CHECK_FLAG(peer
->flags
, PEER_FLAG_CONFIG_NODE
))
128 if (bgp_debug_neighbor_events(peer
))
129 zlog_debug("%s: peer transfer %p fd %d -> %p fd %d)",
130 from_peer
->host
, from_peer
, from_peer
->fd
, peer
,
133 bgp_writes_off(peer
);
135 bgp_writes_off(from_peer
);
136 bgp_reads_off(from_peer
);
138 BGP_TIMER_OFF(peer
->t_routeadv
);
139 BGP_TIMER_OFF(peer
->t_connect
);
140 BGP_TIMER_OFF(peer
->t_connect_check_r
);
141 BGP_TIMER_OFF(peer
->t_connect_check_w
);
142 BGP_TIMER_OFF(from_peer
->t_routeadv
);
143 BGP_TIMER_OFF(from_peer
->t_connect
);
144 BGP_TIMER_OFF(from_peer
->t_connect_check_r
);
145 BGP_TIMER_OFF(from_peer
->t_connect_check_w
);
146 BGP_TIMER_OFF(from_peer
->t_process_packet
);
149 * At this point in time, it is possible that there are packets pending
150 * on various buffers. Those need to be transferred or dropped,
151 * otherwise we'll get spurious failures during session establishment.
153 pthread_mutex_lock(&peer
->io_mtx
);
154 pthread_mutex_lock(&from_peer
->io_mtx
);
157 peer
->fd
= from_peer
->fd
;
160 stream_fifo_clean(peer
->ibuf
);
161 stream_fifo_clean(peer
->obuf
);
164 * this should never happen, since bgp_process_packet() is the
165 * only task that sets and unsets the current packet and it
166 * runs in our pthread.
171 "[%s] Dropping pending packet on connection transfer:",
173 uint16_t type
= stream_getc_from(peer
->curr
,
174 BGP_MARKER_SIZE
+ 2);
175 bgp_dump_packet(peer
, type
, peer
->curr
);
176 stream_free(peer
->curr
);
180 // copy each packet from old peer's output queue to new peer
181 while (from_peer
->obuf
->head
)
182 stream_fifo_push(peer
->obuf
,
183 stream_fifo_pop(from_peer
->obuf
));
185 // copy each packet from old peer's input queue to new peer
186 while (from_peer
->ibuf
->head
)
187 stream_fifo_push(peer
->ibuf
,
188 stream_fifo_pop(from_peer
->ibuf
));
190 ringbuf_wipe(peer
->ibuf_work
);
191 ringbuf_copy(peer
->ibuf_work
, from_peer
->ibuf_work
,
192 ringbuf_remain(from_peer
->ibuf_work
));
194 pthread_mutex_unlock(&from_peer
->io_mtx
);
195 pthread_mutex_unlock(&peer
->io_mtx
);
197 peer
->as
= from_peer
->as
;
198 peer
->v_holdtime
= from_peer
->v_holdtime
;
199 peer
->v_keepalive
= from_peer
->v_keepalive
;
200 peer
->v_routeadv
= from_peer
->v_routeadv
;
201 peer
->v_gr_restart
= from_peer
->v_gr_restart
;
202 peer
->cap
= from_peer
->cap
;
203 status
= peer
->status
;
204 pstatus
= peer
->ostatus
;
205 last_evt
= peer
->last_event
;
206 last_maj_evt
= peer
->last_major_event
;
207 peer
->status
= from_peer
->status
;
208 peer
->ostatus
= from_peer
->ostatus
;
209 peer
->last_event
= from_peer
->last_event
;
210 peer
->last_major_event
= from_peer
->last_major_event
;
211 from_peer
->status
= status
;
212 from_peer
->ostatus
= pstatus
;
213 from_peer
->last_event
= last_evt
;
214 from_peer
->last_major_event
= last_maj_evt
;
215 peer
->remote_id
= from_peer
->remote_id
;
217 if (from_peer
->hostname
!= NULL
) {
218 if (peer
->hostname
) {
219 XFREE(MTYPE_BGP_PEER_HOST
, peer
->hostname
);
220 peer
->hostname
= NULL
;
223 peer
->hostname
= from_peer
->hostname
;
224 from_peer
->hostname
= NULL
;
227 if (from_peer
->domainname
!= NULL
) {
228 if (peer
->domainname
) {
229 XFREE(MTYPE_BGP_PEER_HOST
, peer
->domainname
);
230 peer
->domainname
= NULL
;
233 peer
->domainname
= from_peer
->domainname
;
234 from_peer
->domainname
= NULL
;
237 FOREACH_AFI_SAFI (afi
, safi
) {
238 peer
->af_flags
[afi
][safi
] = from_peer
->af_flags
[afi
][safi
];
239 peer
->af_sflags
[afi
][safi
] = from_peer
->af_sflags
[afi
][safi
];
240 peer
->af_cap
[afi
][safi
] = from_peer
->af_cap
[afi
][safi
];
241 peer
->afc_nego
[afi
][safi
] = from_peer
->afc_nego
[afi
][safi
];
242 peer
->afc_adv
[afi
][safi
] = from_peer
->afc_adv
[afi
][safi
];
243 peer
->afc_recv
[afi
][safi
] = from_peer
->afc_recv
[afi
][safi
];
244 peer
->orf_plist
[afi
][safi
] = from_peer
->orf_plist
[afi
][safi
];
247 if (bgp_getsockname(peer
) < 0) {
250 "%%bgp_getsockname() failed for %s peer %s fd %d (from_peer fd %d)",
251 (CHECK_FLAG(peer
->sflags
, PEER_STATUS_ACCEPT_PEER
)
254 peer
->host
, peer
->fd
, from_peer
->fd
);
259 if (from_peer
->status
> Active
) {
260 if (bgp_getsockname(from_peer
) < 0) {
263 "%%bgp_getsockname() failed for %s from_peer %s fd %d (peer fd %d)",
265 (CHECK_FLAG(from_peer
->sflags
,
266 PEER_STATUS_ACCEPT_PEER
)
269 from_peer
->host
, from_peer
->fd
, peer
->fd
);
276 // Note: peer_xfer_stats() must be called with I/O turned OFF
278 peer_xfer_stats(peer
, from_peer
);
282 thread_add_timer_msec(bm
->master
, bgp_process_packet
, peer
, 0,
283 &peer
->t_process_packet
);
288 /* Hook function called after bgp event is occered. And vty's
289 neighbor command invoke this function after making neighbor
291 void bgp_timer_set(struct peer
*peer
)
293 switch (peer
->status
) {
295 /* First entry point of peer's finite state machine. In Idle
296 status start timer is on unless peer is shutdown or peer is
297 inactive. All other timer must be turned off */
298 if (BGP_PEER_START_SUPPRESSED(peer
) || !peer_active(peer
)
299 || peer
->bgp
->vrf_id
== VRF_UNKNOWN
) {
300 BGP_TIMER_OFF(peer
->t_start
);
302 BGP_TIMER_ON(peer
->t_start
, bgp_start_timer
,
305 BGP_TIMER_OFF(peer
->t_connect
);
306 BGP_TIMER_OFF(peer
->t_holdtime
);
307 bgp_keepalives_off(peer
);
308 BGP_TIMER_OFF(peer
->t_routeadv
);
312 /* After start timer is expired, the peer moves to Connect
313 status. Make sure start timer is off and connect timer is
315 BGP_TIMER_OFF(peer
->t_start
);
316 BGP_TIMER_ON(peer
->t_connect
, bgp_connect_timer
,
318 BGP_TIMER_OFF(peer
->t_holdtime
);
319 bgp_keepalives_off(peer
);
320 BGP_TIMER_OFF(peer
->t_routeadv
);
324 /* Active is waiting connection from remote peer. And if
325 connect timer is expired, change status to Connect. */
326 BGP_TIMER_OFF(peer
->t_start
);
327 /* If peer is passive mode, do not set connect timer. */
328 if (CHECK_FLAG(peer
->flags
, PEER_FLAG_PASSIVE
)
329 || CHECK_FLAG(peer
->sflags
, PEER_STATUS_NSF_WAIT
)) {
330 BGP_TIMER_OFF(peer
->t_connect
);
332 BGP_TIMER_ON(peer
->t_connect
, bgp_connect_timer
,
335 BGP_TIMER_OFF(peer
->t_holdtime
);
336 bgp_keepalives_off(peer
);
337 BGP_TIMER_OFF(peer
->t_routeadv
);
341 /* OpenSent status. */
342 BGP_TIMER_OFF(peer
->t_start
);
343 BGP_TIMER_OFF(peer
->t_connect
);
344 if (peer
->v_holdtime
!= 0) {
345 BGP_TIMER_ON(peer
->t_holdtime
, bgp_holdtime_timer
,
348 BGP_TIMER_OFF(peer
->t_holdtime
);
350 bgp_keepalives_off(peer
);
351 BGP_TIMER_OFF(peer
->t_routeadv
);
355 /* OpenConfirm status. */
356 BGP_TIMER_OFF(peer
->t_start
);
357 BGP_TIMER_OFF(peer
->t_connect
);
359 /* If the negotiated Hold Time value is zero, then the Hold Time
360 timer and KeepAlive timers are not started. */
361 if (peer
->v_holdtime
== 0) {
362 BGP_TIMER_OFF(peer
->t_holdtime
);
363 bgp_keepalives_off(peer
);
365 BGP_TIMER_ON(peer
->t_holdtime
, bgp_holdtime_timer
,
367 bgp_keepalives_on(peer
);
369 BGP_TIMER_OFF(peer
->t_routeadv
);
373 /* In Established status start and connect timer is turned
375 BGP_TIMER_OFF(peer
->t_start
);
376 BGP_TIMER_OFF(peer
->t_connect
);
378 /* Same as OpenConfirm, if holdtime is zero then both holdtime
379 and keepalive must be turned off. */
380 if (peer
->v_holdtime
== 0) {
381 BGP_TIMER_OFF(peer
->t_holdtime
);
382 bgp_keepalives_off(peer
);
384 BGP_TIMER_ON(peer
->t_holdtime
, bgp_holdtime_timer
,
386 bgp_keepalives_on(peer
);
390 BGP_TIMER_OFF(peer
->t_gr_restart
);
391 BGP_TIMER_OFF(peer
->t_gr_stale
);
392 BGP_TIMER_OFF(peer
->t_pmax_restart
);
395 BGP_TIMER_OFF(peer
->t_start
);
396 BGP_TIMER_OFF(peer
->t_connect
);
397 BGP_TIMER_OFF(peer
->t_holdtime
);
398 bgp_keepalives_off(peer
);
399 BGP_TIMER_OFF(peer
->t_routeadv
);
404 /* BGP start timer. This function set BGP_Start event to thread value
405 and process event. */
406 static int bgp_start_timer(struct thread
*thread
)
410 peer
= THREAD_ARG(thread
);
411 peer
->t_start
= NULL
;
413 if (bgp_debug_neighbor_events(peer
))
414 zlog_debug("%s [FSM] Timer (start timer expire).", peer
->host
);
416 THREAD_VAL(thread
) = BGP_Start
;
417 bgp_event(thread
); /* bgp_event unlocks peer */
422 /* BGP connect retry timer. */
423 static int bgp_connect_timer(struct thread
*thread
)
428 peer
= THREAD_ARG(thread
);
430 assert(!peer
->t_write
);
431 assert(!peer
->t_read
);
433 peer
->t_connect
= NULL
;
435 if (bgp_debug_neighbor_events(peer
))
436 zlog_debug("%s [FSM] Timer (connect timer expire)", peer
->host
);
438 if (CHECK_FLAG(peer
->sflags
, PEER_STATUS_ACCEPT_PEER
)) {
442 THREAD_VAL(thread
) = ConnectRetry_timer_expired
;
443 bgp_event(thread
); /* bgp_event unlocks peer */
450 /* BGP holdtime timer. */
451 static int bgp_holdtime_timer(struct thread
*thread
)
455 peer
= THREAD_ARG(thread
);
456 peer
->t_holdtime
= NULL
;
458 if (bgp_debug_neighbor_events(peer
))
459 zlog_debug("%s [FSM] Timer (holdtime timer expire)",
462 THREAD_VAL(thread
) = Hold_Timer_expired
;
463 bgp_event(thread
); /* bgp_event unlocks peer */
468 int bgp_routeadv_timer(struct thread
*thread
)
472 peer
= THREAD_ARG(thread
);
473 peer
->t_routeadv
= NULL
;
475 if (bgp_debug_neighbor_events(peer
))
476 zlog_debug("%s [FSM] Timer (routeadv timer expire)",
479 peer
->synctime
= bgp_clock();
481 thread_add_timer_msec(bm
->master
, bgp_generate_updgrp_packets
, peer
, 0,
482 &peer
->t_generate_updgrp_packets
);
484 /* MRAI timer will be started again when FIFO is built, no need to
490 /* BGP Peer Down Cause */
491 const char *peer_down_str
[] = {"",
495 "Cluster ID changed",
496 "Confederation identifier changed",
497 "Confederation peer changed",
498 "RR client config change",
499 "RS client config change",
500 "Update source change",
501 "Address family activated",
504 "BGP Notification received",
505 "BGP Notification send",
506 "Peer closed the session",
508 "Peer-group add member",
509 "Peer-group delete member",
510 "Capability changed",
511 "Passive config change",
512 "Multihop config change",
513 "NSF peer closed the session",
514 "Intf peering v6only config change",
517 "Neighbor address lost"};
519 static int bgp_graceful_restart_timer_expire(struct thread
*thread
)
525 peer
= THREAD_ARG(thread
);
526 peer
->t_gr_restart
= NULL
;
528 /* NSF delete stale route */
529 for (afi
= AFI_IP
; afi
< AFI_MAX
; afi
++)
530 for (safi
= SAFI_UNICAST
; safi
<= SAFI_MPLS_VPN
; safi
++)
531 if (peer
->nsf
[afi
][safi
])
532 bgp_clear_stale_route(peer
, afi
, safi
);
534 UNSET_FLAG(peer
->sflags
, PEER_STATUS_NSF_WAIT
);
535 BGP_TIMER_OFF(peer
->t_gr_stale
);
537 if (bgp_debug_neighbor_events(peer
)) {
538 zlog_debug("%s graceful restart timer expired", peer
->host
);
539 zlog_debug("%s graceful restart stalepath timer stopped",
548 static int bgp_graceful_stale_timer_expire(struct thread
*thread
)
554 peer
= THREAD_ARG(thread
);
555 peer
->t_gr_stale
= NULL
;
557 if (bgp_debug_neighbor_events(peer
))
558 zlog_debug("%s graceful restart stalepath timer expired",
561 /* NSF delete stale route */
562 for (afi
= AFI_IP
; afi
< AFI_MAX
; afi
++)
563 for (safi
= SAFI_UNICAST
; safi
<= SAFI_MPLS_VPN
; safi
++)
564 if (peer
->nsf
[afi
][safi
])
565 bgp_clear_stale_route(peer
, afi
, safi
);
570 static int bgp_update_delay_applicable(struct bgp
*bgp
)
572 /* update_delay_over flag should be reset (set to 0) for any new
573 applicability of the update-delay during BGP process lifetime.
574 And it should be set after an occurence of the update-delay is
576 if (!bgp
->update_delay_over
)
582 int bgp_update_delay_active(struct bgp
*bgp
)
584 if (bgp
->t_update_delay
)
590 int bgp_update_delay_configured(struct bgp
*bgp
)
592 if (bgp
->v_update_delay
)
598 /* Do the post-processing needed when bgp comes out of the read-only mode
599 on ending the update delay. */
600 void bgp_update_delay_end(struct bgp
*bgp
)
602 THREAD_TIMER_OFF(bgp
->t_update_delay
);
603 THREAD_TIMER_OFF(bgp
->t_establish_wait
);
605 /* Reset update-delay related state */
606 bgp
->update_delay_over
= 1;
607 bgp
->established
= 0;
608 bgp
->restarted_peers
= 0;
609 bgp
->implicit_eors
= 0;
610 bgp
->explicit_eors
= 0;
612 quagga_timestamp(3, bgp
->update_delay_end_time
,
613 sizeof(bgp
->update_delay_end_time
));
616 * Add an end-of-initial-update marker to the main process queues so
618 * the route advertisement timer for the peers can be started. Also set
619 * the zebra and peer update hold flags. These flags are used to achieve
620 * three stages in the update-delay post processing:
621 * 1. Finish best-path selection for all the prefixes held on the
623 * (routes in BGP are updated, and peers sync queues are populated
625 * 2. As the eoiu mark is reached in the bgp process routine, ship all
627 * routes to zebra. With that zebra should see updates from BGP
630 * 3. Unblock the peer update writes. With that peer update packing
632 * the prefixes should be at its maximum.
634 bgp_add_eoiu_mark(bgp
);
635 bgp
->main_zebra_update_hold
= 1;
636 bgp
->main_peers_update_hold
= 1;
638 /* Resume the queue processing. This should trigger the event that would
640 care of processing any work that was queued during the read-only
642 work_queue_unplug(bm
->process_main_queue
);
648 void bgp_start_routeadv(struct bgp
*bgp
)
650 struct listnode
*node
, *nnode
;
653 zlog_info("bgp_start_routeadv(), update hold status %d",
654 bgp
->main_peers_update_hold
);
656 if (bgp
->main_peers_update_hold
)
659 quagga_timestamp(3, bgp
->update_delay_peers_resume_time
,
660 sizeof(bgp
->update_delay_peers_resume_time
));
662 for (ALL_LIST_ELEMENTS(bgp
->peer
, node
, nnode
, peer
)) {
663 if (peer
->status
!= Established
)
665 BGP_TIMER_OFF(peer
->t_routeadv
);
666 BGP_TIMER_ON(peer
->t_routeadv
, bgp_routeadv_timer
, 0);
673 void bgp_adjust_routeadv(struct peer
*peer
)
675 time_t nowtime
= bgp_clock();
677 unsigned long remain
;
679 /* Bypass checks for special case of MRAI being 0 */
680 if (peer
->v_routeadv
== 0) {
681 /* Stop existing timer, just in case it is running for a
683 * duration and schedule write thread immediately.
685 if (peer
->t_routeadv
)
686 BGP_TIMER_OFF(peer
->t_routeadv
);
688 peer
->synctime
= bgp_clock();
689 thread_add_timer_msec(bm
->master
, bgp_generate_updgrp_packets
,
691 &peer
->t_generate_updgrp_packets
);
698 * If the last update was written more than MRAI back, expire the timer
699 * instantly so that we can send the update out sooner.
701 * <------- MRAI --------->
702 * |-----------------|-----------------------|
703 * <------------- m ------------>
712 diff
= difftime(nowtime
, peer
->last_update
);
713 if (diff
> (double)peer
->v_routeadv
) {
714 BGP_TIMER_OFF(peer
->t_routeadv
);
715 BGP_TIMER_ON(peer
->t_routeadv
, bgp_routeadv_timer
, 0);
721 * - Find when to expire the MRAI timer.
722 * If MRAI timer is not active, assume we can start it now.
724 * <------- MRAI --------->
725 * |------------|-----------------------|
726 * <-------- m ----------><----- r ----->
735 if (peer
->t_routeadv
)
736 remain
= thread_timer_remain_second(peer
->t_routeadv
);
738 remain
= peer
->v_routeadv
;
739 diff
= peer
->v_routeadv
- diff
;
740 if (diff
<= (double)remain
) {
741 BGP_TIMER_OFF(peer
->t_routeadv
);
742 BGP_TIMER_ON(peer
->t_routeadv
, bgp_routeadv_timer
, diff
);
746 static int bgp_maxmed_onstartup_applicable(struct bgp
*bgp
)
748 if (!bgp
->maxmed_onstartup_over
)
754 int bgp_maxmed_onstartup_configured(struct bgp
*bgp
)
756 if (bgp
->v_maxmed_onstartup
!= BGP_MAXMED_ONSTARTUP_UNCONFIGURED
)
762 int bgp_maxmed_onstartup_active(struct bgp
*bgp
)
764 if (bgp
->t_maxmed_onstartup
)
770 void bgp_maxmed_update(struct bgp
*bgp
)
772 uint8_t maxmed_active
;
773 uint32_t maxmed_value
;
775 if (bgp
->v_maxmed_admin
) {
777 maxmed_value
= bgp
->maxmed_admin_value
;
778 } else if (bgp
->t_maxmed_onstartup
) {
780 maxmed_value
= bgp
->maxmed_onstartup_value
;
783 maxmed_value
= BGP_MAXMED_VALUE_DEFAULT
;
786 if (bgp
->maxmed_active
!= maxmed_active
787 || bgp
->maxmed_value
!= maxmed_value
) {
788 bgp
->maxmed_active
= maxmed_active
;
789 bgp
->maxmed_value
= maxmed_value
;
791 update_group_announce(bgp
);
795 /* The maxmed onstartup timer expiry callback. */
796 static int bgp_maxmed_onstartup_timer(struct thread
*thread
)
800 zlog_info("Max med on startup ended - timer expired.");
802 bgp
= THREAD_ARG(thread
);
803 THREAD_TIMER_OFF(bgp
->t_maxmed_onstartup
);
804 bgp
->maxmed_onstartup_over
= 1;
806 bgp_maxmed_update(bgp
);
811 static void bgp_maxmed_onstartup_begin(struct bgp
*bgp
)
813 /* Applicable only once in the process lifetime on the startup */
814 if (bgp
->maxmed_onstartup_over
)
817 zlog_info("Begin maxmed onstartup mode - timer %d seconds",
818 bgp
->v_maxmed_onstartup
);
820 thread_add_timer(bm
->master
, bgp_maxmed_onstartup_timer
, bgp
,
821 bgp
->v_maxmed_onstartup
, &bgp
->t_maxmed_onstartup
);
823 if (!bgp
->v_maxmed_admin
) {
824 bgp
->maxmed_active
= 1;
825 bgp
->maxmed_value
= bgp
->maxmed_onstartup_value
;
828 /* Route announce to all peers should happen after this in
832 static void bgp_maxmed_onstartup_process_status_change(struct peer
*peer
)
834 if (peer
->status
== Established
&& !peer
->bgp
->established
) {
835 bgp_maxmed_onstartup_begin(peer
->bgp
);
839 /* The update delay timer expiry callback. */
840 static int bgp_update_delay_timer(struct thread
*thread
)
844 zlog_info("Update delay ended - timer expired.");
846 bgp
= THREAD_ARG(thread
);
847 THREAD_TIMER_OFF(bgp
->t_update_delay
);
848 bgp_update_delay_end(bgp
);
853 /* The establish wait timer expiry callback. */
854 static int bgp_establish_wait_timer(struct thread
*thread
)
858 zlog_info("Establish wait - timer expired.");
860 bgp
= THREAD_ARG(thread
);
861 THREAD_TIMER_OFF(bgp
->t_establish_wait
);
862 bgp_check_update_delay(bgp
);
867 /* Steps to begin the update delay:
868 - initialize queues if needed
869 - stop the queue processing
871 static void bgp_update_delay_begin(struct bgp
*bgp
)
873 struct listnode
*node
, *nnode
;
876 /* Stop the processing of queued work. Enqueue shall continue */
877 work_queue_plug(bm
->process_main_queue
);
879 for (ALL_LIST_ELEMENTS(bgp
->peer
, node
, nnode
, peer
))
880 peer
->update_delay_over
= 0;
882 /* Start the update-delay timer */
883 thread_add_timer(bm
->master
, bgp_update_delay_timer
, bgp
,
884 bgp
->v_update_delay
, &bgp
->t_update_delay
);
886 if (bgp
->v_establish_wait
!= bgp
->v_update_delay
)
887 thread_add_timer(bm
->master
, bgp_establish_wait_timer
, bgp
,
888 bgp
->v_establish_wait
, &bgp
->t_establish_wait
);
890 quagga_timestamp(3, bgp
->update_delay_begin_time
,
891 sizeof(bgp
->update_delay_begin_time
));
894 static void bgp_update_delay_process_status_change(struct peer
*peer
)
896 if (peer
->status
== Established
) {
897 if (!peer
->bgp
->established
++) {
898 bgp_update_delay_begin(peer
->bgp
);
900 "Begin read-only mode - update-delay timer %d seconds",
901 peer
->bgp
->v_update_delay
);
903 if (CHECK_FLAG(peer
->cap
, PEER_CAP_RESTART_BIT_RCV
))
904 bgp_update_restarted_peers(peer
);
906 if (peer
->ostatus
== Established
907 && bgp_update_delay_active(peer
->bgp
)) {
908 /* Adjust the update-delay state to account for this flap.
909 NOTE: Intentionally skipping adjusting implicit_eors or
911 counters. Extra sanity check in bgp_check_update_delay()
913 be enough to take care of any additive discrepancy in bgp eor
915 peer
->bgp
->established
--;
916 peer
->update_delay_over
= 0;
920 /* Called after event occured, this function change status and reset
921 read/write and timer thread. */
922 void bgp_fsm_change_status(struct peer
*peer
, int status
)
925 bgp_dump_state(peer
, peer
->status
, status
);
927 /* Transition into Clearing or Deleted must /always/ clear all routes..
928 * (and must do so before actually changing into Deleted..
930 if (status
>= Clearing
) {
931 bgp_clear_route_all(peer
);
933 /* If no route was queued for the clear-node processing,
935 * completion event here. This is needed because if there are no
937 * to trigger the background clear-node thread, the event won't
939 * generated and the peer would be stuck in Clearing. Note that
941 * event is for the peer and helps the peer transition out of
943 * state; it should not be generated per (AFI,SAFI). The event
945 * directly posted here without calling clear_node_complete() as
947 * shouldn't do an extra unlock. This event will get processed
949 * the state change that happens below, so peer will be in
953 if (!work_queue_is_scheduled(peer
->clear_node_queue
))
954 BGP_EVENT_ADD(peer
, Clearing_Completed
);
957 /* Preserve old status and change into new status. */
958 peer
->ostatus
= peer
->status
;
959 peer
->status
= status
;
961 /* Save event that caused status change. */
962 peer
->last_major_event
= peer
->cur_event
;
964 if (status
== Established
)
965 UNSET_FLAG(peer
->sflags
, PEER_STATUS_ACCEPT_PEER
);
967 /* If max-med processing is applicable, do the necessary. */
968 if (status
== Established
) {
969 if (bgp_maxmed_onstartup_configured(peer
->bgp
)
970 && bgp_maxmed_onstartup_applicable(peer
->bgp
))
971 bgp_maxmed_onstartup_process_status_change(peer
);
973 peer
->bgp
->maxmed_onstartup_over
= 1;
976 /* If update-delay processing is applicable, do the necessary. */
977 if (bgp_update_delay_configured(peer
->bgp
)
978 && bgp_update_delay_applicable(peer
->bgp
))
979 bgp_update_delay_process_status_change(peer
);
981 if (bgp_debug_neighbor_events(peer
))
982 zlog_debug("%s went from %s to %s", peer
->host
,
983 lookup_msg(bgp_status_msg
, peer
->ostatus
, NULL
),
984 lookup_msg(bgp_status_msg
, peer
->status
, NULL
));
987 /* Flush the event queue and ensure the peer is shut down */
988 static int bgp_clearing_completed(struct peer
*peer
)
990 int rc
= bgp_stop(peer
);
993 BGP_EVENT_FLUSH(peer
);
998 /* Administrative BGP peer stop event. */
999 /* May be called multiple times for the same peer */
1000 int bgp_stop(struct peer
*peer
)
1004 char orf_name
[BUFSIZ
];
1007 if (peer_dynamic_neighbor(peer
)
1008 && !(CHECK_FLAG(peer
->flags
, PEER_FLAG_DELETE
))) {
1009 if (bgp_debug_neighbor_events(peer
))
1010 zlog_debug("%s (dynamic neighbor) deleted", peer
->host
);
1015 /* Can't do this in Clearing; events are used for state transitions */
1016 if (peer
->status
!= Clearing
) {
1017 /* Delete all existing events of the peer */
1018 BGP_EVENT_FLUSH(peer
);
1021 /* Increment Dropped count. */
1022 if (peer
->status
== Established
) {
1025 /* bgp log-neighbor-changes of neighbor Down */
1026 if (bgp_flag_check(peer
->bgp
, BGP_FLAG_LOG_NEIGHBOR_CHANGES
)) {
1027 struct vrf
*vrf
= vrf_lookup_by_id(peer
->bgp
->vrf_id
);
1029 "%%ADJCHANGE: neighbor %s(%s) in vrf %s Down %s",
1031 (peer
->hostname
) ? peer
->hostname
: "Unknown",
1032 vrf
? ((vrf
->vrf_id
!= VRF_DEFAULT
) ? vrf
->name
1035 peer_down_str
[(int)peer
->last_reset
]);
1038 /* graceful restart */
1039 if (peer
->t_gr_stale
) {
1040 BGP_TIMER_OFF(peer
->t_gr_stale
);
1041 if (bgp_debug_neighbor_events(peer
))
1043 "%s graceful restart stalepath timer stopped",
1046 if (CHECK_FLAG(peer
->sflags
, PEER_STATUS_NSF_WAIT
)) {
1047 if (bgp_debug_neighbor_events(peer
)) {
1049 "%s graceful restart timer started for %d sec",
1050 peer
->host
, peer
->v_gr_restart
);
1052 "%s graceful restart stalepath timer started for %d sec",
1053 peer
->host
, peer
->bgp
->stalepath_time
);
1055 BGP_TIMER_ON(peer
->t_gr_restart
,
1056 bgp_graceful_restart_timer_expire
,
1057 peer
->v_gr_restart
);
1058 BGP_TIMER_ON(peer
->t_gr_stale
,
1059 bgp_graceful_stale_timer_expire
,
1060 peer
->bgp
->stalepath_time
);
1062 UNSET_FLAG(peer
->sflags
, PEER_STATUS_NSF_MODE
);
1064 for (afi
= AFI_IP
; afi
< AFI_MAX
; afi
++)
1065 for (safi
= SAFI_UNICAST
; safi
<= SAFI_MPLS_VPN
;
1067 peer
->nsf
[afi
][safi
] = 0;
1070 /* set last reset time */
1071 peer
->resettime
= peer
->uptime
= bgp_clock();
1073 if (BGP_DEBUG(update_groups
, UPDATE_GROUPS
))
1074 zlog_debug("%s remove from all update group",
1076 update_group_remove_peer_afs(peer
);
1078 hook_call(peer_backward_transition
, peer
);
1080 /* Reset peer synctime */
1083 bgp_bfd_deregister_peer(peer
);
1086 /* stop keepalives */
1087 bgp_keepalives_off(peer
);
1089 /* Stop read and write threads. */
1090 bgp_writes_off(peer
);
1091 bgp_reads_off(peer
);
1093 THREAD_OFF(peer
->t_connect_check_r
);
1094 THREAD_OFF(peer
->t_connect_check_w
);
1096 /* Stop all timers. */
1097 BGP_TIMER_OFF(peer
->t_start
);
1098 BGP_TIMER_OFF(peer
->t_connect
);
1099 BGP_TIMER_OFF(peer
->t_holdtime
);
1100 BGP_TIMER_OFF(peer
->t_routeadv
);
1102 /* Clear input and output buffer. */
1103 pthread_mutex_lock(&peer
->io_mtx
);
1106 stream_fifo_clean(peer
->ibuf
);
1108 stream_fifo_clean(peer
->obuf
);
1110 if (peer
->ibuf_work
)
1111 ringbuf_wipe(peer
->ibuf_work
);
1112 if (peer
->obuf_work
)
1113 stream_reset(peer
->obuf_work
);
1116 stream_free(peer
->curr
);
1120 pthread_mutex_unlock(&peer
->io_mtx
);
1122 /* Close of file descriptor. */
1123 if (peer
->fd
>= 0) {
1128 FOREACH_AFI_SAFI (afi
, safi
) {
1129 /* Reset all negotiated variables */
1130 peer
->afc_nego
[afi
][safi
] = 0;
1131 peer
->afc_adv
[afi
][safi
] = 0;
1132 peer
->afc_recv
[afi
][safi
] = 0;
1134 /* peer address family capability flags*/
1135 peer
->af_cap
[afi
][safi
] = 0;
1137 /* peer address family status flags*/
1138 peer
->af_sflags
[afi
][safi
] = 0;
1140 /* Received ORF prefix-filter */
1141 peer
->orf_plist
[afi
][safi
] = NULL
;
1143 if ((peer
->status
== OpenConfirm
)
1144 || (peer
->status
== Established
)) {
1145 /* ORF received prefix-filter pnt */
1146 sprintf(orf_name
, "%s.%d.%d", peer
->host
, afi
, safi
);
1147 prefix_bgp_orf_remove_all(afi
, orf_name
);
1151 /* Reset keepalive and holdtime */
1152 if (CHECK_FLAG(peer
->flags
, PEER_FLAG_TIMER
)) {
1153 peer
->v_keepalive
= peer
->keepalive
;
1154 peer
->v_holdtime
= peer
->holdtime
;
1156 peer
->v_keepalive
= peer
->bgp
->default_keepalive
;
1157 peer
->v_holdtime
= peer
->bgp
->default_holdtime
;
1160 peer
->update_time
= 0;
1162 /* Until we are sure that there is no problem about prefix count
1163 this should be commented out.*/
1165 /* Reset prefix count */
1166 peer
->pcount
[AFI_IP
][SAFI_UNICAST
] = 0;
1167 peer
->pcount
[AFI_IP
][SAFI_MULTICAST
] = 0;
1168 peer
->pcount
[AFI_IP
][SAFI_LABELED_UNICAST
] = 0;
1169 peer
->pcount
[AFI_IP
][SAFI_MPLS_VPN
] = 0;
1170 peer
->pcount
[AFI_IP6
][SAFI_UNICAST
] = 0;
1171 peer
->pcount
[AFI_IP6
][SAFI_MULTICAST
] = 0;
1172 peer
->pcount
[AFI_IP6
][SAFI_LABELED_UNICAST
] = 0;
1175 if (!CHECK_FLAG(peer
->flags
, PEER_FLAG_CONFIG_NODE
)
1176 && !(CHECK_FLAG(peer
->flags
, PEER_FLAG_DELETE
))) {
1180 bgp_peer_conf_if_to_su_update(peer
);
1186 /* BGP peer is stoped by the error. */
1187 static int bgp_stop_with_error(struct peer
*peer
)
1189 /* Double start timer. */
1192 /* Overflow check. */
1193 if (peer
->v_start
>= (60 * 2))
1194 peer
->v_start
= (60 * 2);
1196 if (peer_dynamic_neighbor(peer
)) {
1197 if (bgp_debug_neighbor_events(peer
))
1198 zlog_debug("%s (dynamic neighbor) deleted", peer
->host
);
1203 return (bgp_stop(peer
));
1207 /* something went wrong, send notify and tear down */
1208 static int bgp_stop_with_notify(struct peer
*peer
, uint8_t code
,
1211 /* Send notify to remote peer */
1212 bgp_notify_send(peer
, code
, sub_code
);
1214 if (peer_dynamic_neighbor(peer
)) {
1215 if (bgp_debug_neighbor_events(peer
))
1216 zlog_debug("%s (dynamic neighbor) deleted", peer
->host
);
1221 /* Clear start timer value to default. */
1222 peer
->v_start
= BGP_INIT_START_TIMER
;
1224 return (bgp_stop(peer
));
1228 * Determines whether a TCP session has successfully established for a peer and
1229 * events as appropriate.
1231 * This function is called when setting up a new session. After connect() is
1232 * called on the peer's socket (in bgp_start()), the fd is passed to poll()
1233 * to wait for connection success or failure. When poll() returns, this
1234 * function is called to evaluate the result.
1236 * Due to differences in behavior of poll() on Linux and BSD - specifically,
1237 * the value of .revents in the case of a closed connection - this function is
1238 * scheduled both for a read and a write event. The write event is triggered
1239 * when the connection is established. A read event is triggered when the
1240 * connection is closed. Thus we need to cancel whichever one did not occur.
1242 static int bgp_connect_check(struct thread
*thread
)
1249 peer
= THREAD_ARG(thread
);
1250 assert(!CHECK_FLAG(peer
->thread_flags
, PEER_THREAD_READS_ON
));
1251 assert(!CHECK_FLAG(peer
->thread_flags
, PEER_THREAD_WRITES_ON
));
1252 assert(!peer
->t_read
);
1253 assert(!peer
->t_write
);
1255 THREAD_OFF(peer
->t_connect_check_r
);
1256 THREAD_OFF(peer
->t_connect_check_w
);
1258 /* Check file descriptor. */
1259 slen
= sizeof(status
);
1260 ret
= getsockopt(peer
->fd
, SOL_SOCKET
, SO_ERROR
, (void *)&status
,
1263 /* If getsockopt is fail, this is fatal error. */
1265 zlog_info("can't get sockopt for nonblocking connect: %d(%s)",
1266 errno
, safe_strerror(errno
));
1267 BGP_EVENT_ADD(peer
, TCP_fatal_error
);
1271 /* When status is 0 then TCP connection is established. */
1273 BGP_EVENT_ADD(peer
, TCP_connection_open
);
1276 if (bgp_debug_neighbor_events(peer
))
1277 zlog_debug("%s [Event] Connect failed %d(%s)",
1278 peer
->host
, status
, safe_strerror(status
));
1279 BGP_EVENT_ADD(peer
, TCP_connection_open_failed
);
1284 /* TCP connection open. Next we send open message to remote peer. And
1285 add read thread for reading open message. */
1286 static int bgp_connect_success(struct peer
*peer
)
1289 flog_err(BGP_ERR_CONNECT
,
1290 "bgp_connect_success peer's fd is negative value %d",
1296 if (bgp_getsockname(peer
) < 0) {
1297 flog_err_sys(LIB_ERR_SOCKET
,
1298 "%s: bgp_getsockname(): failed for peer %s, fd %d",
1299 __FUNCTION__
, peer
->host
, peer
->fd
);
1300 bgp_notify_send(peer
, BGP_NOTIFY_FSM_ERR
,
1301 0); /* internal error */
1302 bgp_writes_on(peer
);
1308 if (bgp_debug_neighbor_events(peer
)) {
1309 char buf1
[SU_ADDRSTRLEN
];
1311 if (!CHECK_FLAG(peer
->sflags
, PEER_STATUS_ACCEPT_PEER
))
1312 zlog_debug("%s open active, local address %s",
1314 sockunion2str(peer
->su_local
, buf1
,
1317 zlog_debug("%s passive open", peer
->host
);
1320 bgp_open_send(peer
);
1325 /* TCP connect fail */
1326 static int bgp_connect_fail(struct peer
*peer
)
1328 if (peer_dynamic_neighbor(peer
)) {
1329 if (bgp_debug_neighbor_events(peer
))
1330 zlog_debug("%s (dynamic neighbor) deleted", peer
->host
);
1335 return (bgp_stop(peer
));
1338 /* This function is the first starting point of all BGP connection. It
1339 try to connect to remote peer with non-blocking IO. */
1340 int bgp_start(struct peer
*peer
)
1345 bgp_peer_conf_if_to_su_update(peer
);
1347 if (peer
->su
.sa
.sa_family
== AF_UNSPEC
) {
1348 if (bgp_debug_neighbor_events(peer
))
1350 "%s [FSM] Unable to get neighbor's IP address, waiting...",
1355 if (BGP_PEER_START_SUPPRESSED(peer
)) {
1356 if (bgp_debug_neighbor_events(peer
))
1357 flog_err(BGP_ERR_FSM
,
1358 "%s [FSM] Trying to start suppressed peer"
1359 " - this is never supposed to happen!",
1364 /* Scrub some information that might be left over from a previous,
1367 /* Connection information. */
1368 if (peer
->su_local
) {
1369 sockunion_free(peer
->su_local
);
1370 peer
->su_local
= NULL
;
1373 if (peer
->su_remote
) {
1374 sockunion_free(peer
->su_remote
);
1375 peer
->su_remote
= NULL
;
1378 /* Clear remote router-id. */
1379 peer
->remote_id
.s_addr
= 0;
1381 /* Clear peer capability flag. */
1384 /* If the peer is passive mode, force to move to Active mode. */
1385 if (CHECK_FLAG(peer
->flags
, PEER_FLAG_PASSIVE
)) {
1386 BGP_EVENT_ADD(peer
, TCP_connection_open_failed
);
1390 if (peer
->bgp
->vrf_id
== VRF_UNKNOWN
) {
1391 if (bgp_debug_neighbor_events(peer
))
1394 "%s [FSM] In a VRF that is not initialised yet",
1399 /* Register to be notified on peer up */
1400 if (peer
->sort
== BGP_PEER_EBGP
&& peer
->ttl
== 1
1401 && !CHECK_FLAG(peer
->flags
, PEER_FLAG_DISABLE_CONNECTED_CHECK
)
1402 && !bgp_flag_check(peer
->bgp
, BGP_FLAG_DISABLE_NH_CONNECTED_CHK
))
1407 if (!bgp_find_or_add_nexthop(peer
->bgp
, peer
->bgp
,
1408 family2afi(peer
->su
.sa
.sa_family
), NULL
,
1410 if (bgp_zebra_num_connects()) {
1411 if (bgp_debug_neighbor_events(peer
))
1412 zlog_debug("%s [FSM] Waiting for NHT",
1415 BGP_EVENT_ADD(peer
, TCP_connection_open_failed
);
1420 assert(!peer
->t_write
);
1421 assert(!peer
->t_read
);
1422 assert(!CHECK_FLAG(peer
->thread_flags
, PEER_THREAD_WRITES_ON
));
1423 assert(!CHECK_FLAG(peer
->thread_flags
, PEER_THREAD_READS_ON
));
1424 status
= bgp_connect(peer
);
1428 if (bgp_debug_neighbor_events(peer
))
1429 zlog_debug("%s [FSM] Connect error", peer
->host
);
1430 BGP_EVENT_ADD(peer
, TCP_connection_open_failed
);
1432 case connect_success
:
1433 if (bgp_debug_neighbor_events(peer
))
1435 "%s [FSM] Connect immediately success, fd %d",
1436 peer
->host
, peer
->fd
);
1437 BGP_EVENT_ADD(peer
, TCP_connection_open
);
1439 case connect_in_progress
:
1440 /* To check nonblocking connect, we wait until socket is
1441 readable or writable. */
1442 if (bgp_debug_neighbor_events(peer
))
1444 "%s [FSM] Non blocking connect waiting result, fd %d",
1445 peer
->host
, peer
->fd
);
1447 flog_err(BGP_ERR_FSM
,
1448 "bgp_start peer's fd is negative value %d",
1453 * - when the socket becomes ready, poll() will signify POLLOUT
1454 * - if it fails to connect, poll() will signify POLLHUP
1455 * - POLLHUP is handled as a 'read' event by thread.c
1457 * therefore, we schedule both a read and a write event with
1458 * bgp_connect_check() as the handler for each and cancel the
1459 * unused event in that function.
1461 thread_add_read(bm
->master
, bgp_connect_check
, peer
, peer
->fd
,
1462 &peer
->t_connect_check_r
);
1463 thread_add_write(bm
->master
, bgp_connect_check
, peer
, peer
->fd
,
1464 &peer
->t_connect_check_w
);
1470 /* Connect retry timer is expired when the peer status is Connect. */
1471 static int bgp_reconnect(struct peer
*peer
)
1473 if (bgp_stop(peer
) < 0)
1480 static int bgp_fsm_open(struct peer
*peer
)
1482 /* Send keepalive and make keepalive timer */
1483 bgp_keepalive_send(peer
);
1485 /* Reset holdtimer value. */
1486 BGP_TIMER_OFF(peer
->t_holdtime
);
1491 /* FSM error, unexpected event. This is error of BGP connection. So cut the
1492 peer and change to Idle status. */
1493 static int bgp_fsm_event_error(struct peer
*peer
)
1495 flog_err(BGP_ERR_FSM
,
1496 "%s [FSM] unexpected packet received in state %s", peer
->host
,
1497 lookup_msg(bgp_status_msg
, peer
->status
, NULL
));
1499 return bgp_stop_with_notify(peer
, BGP_NOTIFY_FSM_ERR
, 0);
1502 /* Hold timer expire. This is error of BGP connection. So cut the
1503 peer and change to Idle status. */
1504 static int bgp_fsm_holdtime_expire(struct peer
*peer
)
1506 if (bgp_debug_neighbor_events(peer
))
1507 zlog_debug("%s [FSM] Hold timer expire", peer
->host
);
1509 return bgp_stop_with_notify(peer
, BGP_NOTIFY_HOLD_ERR
, 0);
1513 * Transition to Established state.
1515 * Convert peer from stub to full fledged peer, set some timers, and generate
1518 static int bgp_establish(struct peer
*peer
)
1522 int nsf_af_count
= 0;
1526 other
= peer
->doppelganger
;
1527 peer
= peer_xfer_conn(peer
);
1529 flog_err(BGP_ERR_CONNECT
, "%%Neighbor failed in xfer_conn");
1534 ret
= 1; /* bgp_establish specific code when xfer_conn
1537 /* Reset capability open status flag. */
1538 if (!CHECK_FLAG(peer
->sflags
, PEER_STATUS_CAPABILITY_OPEN
))
1539 SET_FLAG(peer
->sflags
, PEER_STATUS_CAPABILITY_OPEN
);
1541 /* Clear start timer value to default. */
1542 peer
->v_start
= BGP_INIT_START_TIMER
;
1544 /* Increment established count. */
1545 peer
->established
++;
1546 bgp_fsm_change_status(peer
, Established
);
1548 /* bgp log-neighbor-changes of neighbor Up */
1549 if (bgp_flag_check(peer
->bgp
, BGP_FLAG_LOG_NEIGHBOR_CHANGES
)) {
1550 struct vrf
*vrf
= vrf_lookup_by_id(peer
->bgp
->vrf_id
);
1551 zlog_info("%%ADJCHANGE: neighbor %s(%s) in vrf %s Up",
1553 (peer
->hostname
) ? peer
->hostname
: "Unknown",
1554 vrf
? ((vrf
->vrf_id
!= VRF_DEFAULT
) ? vrf
->name
1558 /* assign update-group/subgroup */
1559 update_group_adjust_peer_afs(peer
);
1561 /* graceful restart */
1562 UNSET_FLAG(peer
->sflags
, PEER_STATUS_NSF_WAIT
);
1563 for (afi
= AFI_IP
; afi
< AFI_MAX
; afi
++)
1564 for (safi
= SAFI_UNICAST
; safi
<= SAFI_MPLS_VPN
; safi
++) {
1565 if (peer
->afc_nego
[afi
][safi
]
1566 && CHECK_FLAG(peer
->cap
, PEER_CAP_RESTART_ADV
)
1567 && CHECK_FLAG(peer
->af_cap
[afi
][safi
],
1568 PEER_CAP_RESTART_AF_RCV
)) {
1569 if (peer
->nsf
[afi
][safi
]
1571 peer
->af_cap
[afi
][safi
],
1572 PEER_CAP_RESTART_AF_PRESERVE_RCV
))
1573 bgp_clear_stale_route(peer
, afi
, safi
);
1575 peer
->nsf
[afi
][safi
] = 1;
1578 if (peer
->nsf
[afi
][safi
])
1579 bgp_clear_stale_route(peer
, afi
, safi
);
1580 peer
->nsf
[afi
][safi
] = 0;
1585 SET_FLAG(peer
->sflags
, PEER_STATUS_NSF_MODE
);
1587 UNSET_FLAG(peer
->sflags
, PEER_STATUS_NSF_MODE
);
1588 if (peer
->t_gr_stale
) {
1589 BGP_TIMER_OFF(peer
->t_gr_stale
);
1590 if (bgp_debug_neighbor_events(peer
))
1592 "%s graceful restart stalepath timer stopped",
1597 if (peer
->t_gr_restart
) {
1598 BGP_TIMER_OFF(peer
->t_gr_restart
);
1599 if (bgp_debug_neighbor_events(peer
))
1600 zlog_debug("%s graceful restart timer stopped",
1604 hook_call(peer_established
, peer
);
1606 /* Reset uptime, turn on keepalives, send current table. */
1607 if (!peer
->v_holdtime
)
1608 bgp_keepalives_on(peer
);
1610 peer
->uptime
= bgp_clock();
1612 /* Send route-refresh when ORF is enabled */
1613 FOREACH_AFI_SAFI (afi
, safi
) {
1614 if (CHECK_FLAG(peer
->af_cap
[afi
][safi
],
1615 PEER_CAP_ORF_PREFIX_SM_ADV
)) {
1616 if (CHECK_FLAG(peer
->af_cap
[afi
][safi
],
1617 PEER_CAP_ORF_PREFIX_RM_RCV
))
1618 bgp_route_refresh_send(peer
, afi
, safi
,
1620 REFRESH_IMMEDIATE
, 0);
1621 else if (CHECK_FLAG(peer
->af_cap
[afi
][safi
],
1622 PEER_CAP_ORF_PREFIX_RM_OLD_RCV
))
1623 bgp_route_refresh_send(peer
, afi
, safi
,
1624 ORF_TYPE_PREFIX_OLD
,
1625 REFRESH_IMMEDIATE
, 0);
1629 /* First update is deferred until ORF or ROUTE-REFRESH is received */
1630 FOREACH_AFI_SAFI (afi
, safi
) {
1631 if (CHECK_FLAG(peer
->af_cap
[afi
][safi
],
1632 PEER_CAP_ORF_PREFIX_RM_ADV
))
1633 if (CHECK_FLAG(peer
->af_cap
[afi
][safi
],
1634 PEER_CAP_ORF_PREFIX_SM_RCV
)
1635 || CHECK_FLAG(peer
->af_cap
[afi
][safi
],
1636 PEER_CAP_ORF_PREFIX_SM_OLD_RCV
))
1637 SET_FLAG(peer
->af_sflags
[afi
][safi
],
1638 PEER_STATUS_ORF_WAIT_REFRESH
);
1641 bgp_announce_peer(peer
);
1643 /* Start the route advertisement timer to send updates to the peer - if
1645 * is not in read-only mode. If it is, the timer will be started at the
1647 * of read-only mode.
1649 if (!bgp_update_delay_active(peer
->bgp
)) {
1650 BGP_TIMER_OFF(peer
->t_routeadv
);
1651 BGP_TIMER_ON(peer
->t_routeadv
, bgp_routeadv_timer
, 0);
1654 if (peer
->doppelganger
&& (peer
->doppelganger
->status
!= Deleted
)) {
1655 if (bgp_debug_neighbor_events(peer
))
1657 "[Event] Deleting stub connection for peer %s",
1660 if (peer
->doppelganger
->status
> Active
)
1661 bgp_notify_send(peer
->doppelganger
, BGP_NOTIFY_CEASE
,
1662 BGP_NOTIFY_CEASE_COLLISION_RESOLUTION
);
1664 peer_delete(peer
->doppelganger
);
1667 bgp_bfd_register_peer(peer
);
1671 /* Keepalive packet is received. */
1672 static int bgp_fsm_keepalive(struct peer
*peer
)
1674 BGP_TIMER_OFF(peer
->t_holdtime
);
1678 /* Update packet is received. */
1679 static int bgp_fsm_update(struct peer
*peer
)
1681 BGP_TIMER_OFF(peer
->t_holdtime
);
1685 /* This is empty event. */
1686 static int bgp_ignore(struct peer
*peer
)
1690 "%s [FSM] Ignoring event %s in state %s, prior events %s, %s, fd %d",
1691 peer
->host
, bgp_event_str
[peer
->cur_event
],
1692 lookup_msg(bgp_status_msg
, peer
->status
, NULL
),
1693 bgp_event_str
[peer
->last_event
],
1694 bgp_event_str
[peer
->last_major_event
], peer
->fd
);
1698 /* This is to handle unexpected events.. */
1699 static int bgp_fsm_exeption(struct peer
*peer
)
1703 "%s [FSM] Unexpected event %s in state %s, prior events %s, %s, fd %d",
1704 peer
->host
, bgp_event_str
[peer
->cur_event
],
1705 lookup_msg(bgp_status_msg
, peer
->status
, NULL
),
1706 bgp_event_str
[peer
->last_event
],
1707 bgp_event_str
[peer
->last_major_event
], peer
->fd
);
1708 return (bgp_stop(peer
));
1711 void bgp_fsm_nht_update(struct peer
*peer
, int valid
)
1716 switch (peer
->status
) {
1719 BGP_EVENT_ADD(peer
, BGP_Start
);
1723 BGP_TIMER_OFF(peer
->t_connect
);
1724 BGP_EVENT_ADD(peer
, TCP_fatal_error
);
1729 BGP_TIMER_OFF(peer
->t_connect
);
1730 BGP_EVENT_ADD(peer
, ConnectRetry_timer_expired
);
1736 if (!valid
&& (peer
->gtsm_hops
== 1))
1737 BGP_EVENT_ADD(peer
, TCP_fatal_error
);
1746 /* Finite State Machine structure */
1747 static const struct {
1748 int (*func
)(struct peer
*);
1750 } FSM
[BGP_STATUS_MAX
- 1][BGP_EVENTS_MAX
- 1] = {
1752 /* Idle state: In Idle state, all events other than BGP_Start is
1753 ignored. With BGP_Start event, finite state machine calls
1755 {bgp_start
, Connect
}, /* BGP_Start */
1756 {bgp_stop
, Idle
}, /* BGP_Stop */
1757 {bgp_stop
, Idle
}, /* TCP_connection_open */
1758 {bgp_stop
, Idle
}, /* TCP_connection_closed */
1759 {bgp_ignore
, Idle
}, /* TCP_connection_open_failed */
1760 {bgp_stop
, Idle
}, /* TCP_fatal_error */
1761 {bgp_ignore
, Idle
}, /* ConnectRetry_timer_expired */
1762 {bgp_ignore
, Idle
}, /* Hold_Timer_expired */
1763 {bgp_ignore
, Idle
}, /* KeepAlive_timer_expired */
1764 {bgp_ignore
, Idle
}, /* Receive_OPEN_message */
1765 {bgp_ignore
, Idle
}, /* Receive_KEEPALIVE_message */
1766 {bgp_ignore
, Idle
}, /* Receive_UPDATE_message */
1767 {bgp_ignore
, Idle
}, /* Receive_NOTIFICATION_message */
1768 {bgp_ignore
, Idle
}, /* Clearing_Completed */
1772 {bgp_ignore
, Connect
}, /* BGP_Start */
1773 {bgp_stop
, Idle
}, /* BGP_Stop */
1774 {bgp_connect_success
, OpenSent
}, /* TCP_connection_open */
1775 {bgp_stop
, Idle
}, /* TCP_connection_closed */
1776 {bgp_connect_fail
, Active
}, /* TCP_connection_open_failed */
1777 {bgp_connect_fail
, Idle
}, /* TCP_fatal_error */
1778 {bgp_reconnect
, Connect
}, /* ConnectRetry_timer_expired */
1779 {bgp_fsm_exeption
, Idle
}, /* Hold_Timer_expired */
1780 {bgp_fsm_exeption
, Idle
}, /* KeepAlive_timer_expired */
1781 {bgp_fsm_exeption
, Idle
}, /* Receive_OPEN_message */
1782 {bgp_fsm_exeption
, Idle
}, /* Receive_KEEPALIVE_message */
1783 {bgp_fsm_exeption
, Idle
}, /* Receive_UPDATE_message */
1784 {bgp_stop
, Idle
}, /* Receive_NOTIFICATION_message */
1785 {bgp_fsm_exeption
, Idle
}, /* Clearing_Completed */
1789 {bgp_ignore
, Active
}, /* BGP_Start */
1790 {bgp_stop
, Idle
}, /* BGP_Stop */
1791 {bgp_connect_success
, OpenSent
}, /* TCP_connection_open */
1792 {bgp_stop
, Idle
}, /* TCP_connection_closed */
1793 {bgp_ignore
, Active
}, /* TCP_connection_open_failed */
1794 {bgp_fsm_exeption
, Idle
}, /* TCP_fatal_error */
1795 {bgp_start
, Connect
}, /* ConnectRetry_timer_expired */
1796 {bgp_fsm_exeption
, Idle
}, /* Hold_Timer_expired */
1797 {bgp_fsm_exeption
, Idle
}, /* KeepAlive_timer_expired */
1798 {bgp_fsm_exeption
, Idle
}, /* Receive_OPEN_message */
1799 {bgp_fsm_exeption
, Idle
}, /* Receive_KEEPALIVE_message */
1800 {bgp_fsm_exeption
, Idle
}, /* Receive_UPDATE_message */
1801 {bgp_fsm_exeption
, Idle
}, /* Receive_NOTIFICATION_message */
1802 {bgp_fsm_exeption
, Idle
}, /* Clearing_Completed */
1806 {bgp_ignore
, OpenSent
}, /* BGP_Start */
1807 {bgp_stop
, Idle
}, /* BGP_Stop */
1808 {bgp_stop
, Active
}, /* TCP_connection_open */
1809 {bgp_stop
, Active
}, /* TCP_connection_closed */
1810 {bgp_stop
, Active
}, /* TCP_connection_open_failed */
1811 {bgp_stop
, Active
}, /* TCP_fatal_error */
1812 {bgp_fsm_exeption
, Idle
}, /* ConnectRetry_timer_expired */
1813 {bgp_fsm_holdtime_expire
, Idle
}, /* Hold_Timer_expired */
1814 {bgp_fsm_exeption
, Idle
}, /* KeepAlive_timer_expired */
1815 {bgp_fsm_open
, OpenConfirm
}, /* Receive_OPEN_message */
1816 {bgp_fsm_event_error
, Idle
}, /* Receive_KEEPALIVE_message */
1817 {bgp_fsm_event_error
, Idle
}, /* Receive_UPDATE_message */
1818 {bgp_stop_with_error
, Idle
}, /* Receive_NOTIFICATION_message */
1819 {bgp_fsm_exeption
, Idle
}, /* Clearing_Completed */
1823 {bgp_ignore
, OpenConfirm
}, /* BGP_Start */
1824 {bgp_stop
, Idle
}, /* BGP_Stop */
1825 {bgp_stop
, Idle
}, /* TCP_connection_open */
1826 {bgp_stop
, Idle
}, /* TCP_connection_closed */
1827 {bgp_stop
, Idle
}, /* TCP_connection_open_failed */
1828 {bgp_stop
, Idle
}, /* TCP_fatal_error */
1829 {bgp_fsm_exeption
, Idle
}, /* ConnectRetry_timer_expired */
1830 {bgp_fsm_holdtime_expire
, Idle
}, /* Hold_Timer_expired */
1831 {bgp_ignore
, OpenConfirm
}, /* KeepAlive_timer_expired */
1832 {bgp_fsm_exeption
, Idle
}, /* Receive_OPEN_message */
1833 {bgp_establish
, Established
}, /* Receive_KEEPALIVE_message */
1834 {bgp_fsm_exeption
, Idle
}, /* Receive_UPDATE_message */
1835 {bgp_stop_with_error
, Idle
}, /* Receive_NOTIFICATION_message */
1836 {bgp_fsm_exeption
, Idle
}, /* Clearing_Completed */
1840 {bgp_ignore
, Established
}, /* BGP_Start */
1841 {bgp_stop
, Clearing
}, /* BGP_Stop */
1842 {bgp_stop
, Clearing
}, /* TCP_connection_open */
1843 {bgp_stop
, Clearing
}, /* TCP_connection_closed */
1844 {bgp_stop
, Clearing
}, /* TCP_connection_open_failed */
1845 {bgp_stop
, Clearing
}, /* TCP_fatal_error */
1846 {bgp_stop
, Clearing
}, /* ConnectRetry_timer_expired */
1847 {bgp_fsm_holdtime_expire
, Clearing
}, /* Hold_Timer_expired */
1848 {bgp_ignore
, Established
}, /* KeepAlive_timer_expired */
1849 {bgp_stop
, Clearing
}, /* Receive_OPEN_message */
1851 Established
}, /* Receive_KEEPALIVE_message */
1852 {bgp_fsm_update
, Established
}, /* Receive_UPDATE_message */
1853 {bgp_stop_with_error
,
1854 Clearing
}, /* Receive_NOTIFICATION_message */
1855 {bgp_fsm_exeption
, Idle
}, /* Clearing_Completed */
1859 {bgp_ignore
, Clearing
}, /* BGP_Start */
1860 {bgp_stop
, Clearing
}, /* BGP_Stop */
1861 {bgp_stop
, Clearing
}, /* TCP_connection_open */
1862 {bgp_stop
, Clearing
}, /* TCP_connection_closed */
1863 {bgp_stop
, Clearing
}, /* TCP_connection_open_failed */
1864 {bgp_stop
, Clearing
}, /* TCP_fatal_error */
1865 {bgp_stop
, Clearing
}, /* ConnectRetry_timer_expired */
1866 {bgp_stop
, Clearing
}, /* Hold_Timer_expired */
1867 {bgp_stop
, Clearing
}, /* KeepAlive_timer_expired */
1868 {bgp_stop
, Clearing
}, /* Receive_OPEN_message */
1869 {bgp_stop
, Clearing
}, /* Receive_KEEPALIVE_message */
1870 {bgp_stop
, Clearing
}, /* Receive_UPDATE_message */
1871 {bgp_stop
, Clearing
}, /* Receive_NOTIFICATION_message */
1872 {bgp_clearing_completed
, Idle
}, /* Clearing_Completed */
1876 {bgp_ignore
, Deleted
}, /* BGP_Start */
1877 {bgp_ignore
, Deleted
}, /* BGP_Stop */
1878 {bgp_ignore
, Deleted
}, /* TCP_connection_open */
1879 {bgp_ignore
, Deleted
}, /* TCP_connection_closed */
1880 {bgp_ignore
, Deleted
}, /* TCP_connection_open_failed */
1881 {bgp_ignore
, Deleted
}, /* TCP_fatal_error */
1882 {bgp_ignore
, Deleted
}, /* ConnectRetry_timer_expired */
1883 {bgp_ignore
, Deleted
}, /* Hold_Timer_expired */
1884 {bgp_ignore
, Deleted
}, /* KeepAlive_timer_expired */
1885 {bgp_ignore
, Deleted
}, /* Receive_OPEN_message */
1886 {bgp_ignore
, Deleted
}, /* Receive_KEEPALIVE_message */
1887 {bgp_ignore
, Deleted
}, /* Receive_UPDATE_message */
1888 {bgp_ignore
, Deleted
}, /* Receive_NOTIFICATION_message */
1889 {bgp_ignore
, Deleted
}, /* Clearing_Completed */
1893 /* Execute event process. */
1894 int bgp_event(struct thread
*thread
)
1900 peer
= THREAD_ARG(thread
);
1901 event
= THREAD_VAL(thread
);
1903 ret
= bgp_event_update(peer
, event
);
1908 int bgp_event_update(struct peer
*peer
, int event
)
1913 int passive_conn
= 0;
1916 /* default return code */
1917 ret
= FSM_PEER_NOOP
;
1919 other
= peer
->doppelganger
;
1921 (CHECK_FLAG(peer
->sflags
, PEER_STATUS_ACCEPT_PEER
)) ? 1 : 0;
1922 dyn_nbr
= peer_dynamic_neighbor(peer
);
1924 /* Logging this event. */
1925 next
= FSM
[peer
->status
- 1][event
- 1].next_state
;
1927 if (bgp_debug_neighbor_events(peer
) && peer
->status
!= next
)
1928 zlog_debug("%s [FSM] %s (%s->%s), fd %d", peer
->host
,
1929 bgp_event_str
[event
],
1930 lookup_msg(bgp_status_msg
, peer
->status
, NULL
),
1931 lookup_msg(bgp_status_msg
, next
, NULL
), peer
->fd
);
1933 peer
->last_event
= peer
->cur_event
;
1934 peer
->cur_event
= event
;
1936 /* Call function. */
1937 if (FSM
[peer
->status
- 1][event
- 1].func
)
1938 ret
= (*(FSM
[peer
->status
- 1][event
- 1].func
))(peer
);
1941 if (ret
== 1 && next
== Established
) {
1942 /* The case when doppelganger swap accurred in
1944 Update the peer pointer accordingly */
1945 ret
= FSM_PEER_TRANSFERRED
;
1949 /* If status is changed. */
1950 if (next
!= peer
->status
) {
1951 bgp_fsm_change_status(peer
, next
);
1954 * If we're going to ESTABLISHED then we executed a
1955 * peer transfer. In this case we can either return
1956 * FSM_PEER_TRANSITIONED or FSM_PEER_TRANSFERRED.
1957 * Opting for TRANSFERRED since transfer implies
1958 * session establishment.
1960 if (ret
!= FSM_PEER_TRANSFERRED
)
1961 ret
= FSM_PEER_TRANSITIONED
;
1964 /* Make sure timer is set. */
1965 bgp_timer_set(peer
);
1969 * If we got a return value of -1, that means there was an
1970 * error, restart the FSM. Since bgp_stop() was called on the
1971 * peer. only a few fields are safe to access here. In any case
1972 * we need to indicate that the peer was stopped in the return
1975 if (!dyn_nbr
&& !passive_conn
&& peer
->bgp
) {
1978 "%s [FSM] Failure handling event %s in state %s, "
1979 "prior events %s, %s, fd %d",
1980 peer
->host
, bgp_event_str
[peer
->cur_event
],
1981 lookup_msg(bgp_status_msg
, peer
->status
, NULL
),
1982 bgp_event_str
[peer
->last_event
],
1983 bgp_event_str
[peer
->last_major_event
],
1986 bgp_fsm_change_status(peer
, Idle
);
1987 bgp_timer_set(peer
);
1989 ret
= FSM_PEER_STOPPED
;