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d62a17ae | 1 | /* BGP-4 Finite State Machine |
896014f4 DL |
2 | * From RFC1771 [A Border Gateway Protocol 4 (BGP-4)] |
3 | * Copyright (C) 1996, 97, 98 Kunihiro Ishiguro | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
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 | |
10 | * later version. | |
11 | * | |
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. | |
16 | * | |
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 | |
20 | */ | |
718e3744 | 21 | |
22 | #include <zebra.h> | |
23 | ||
24 | #include "linklist.h" | |
25 | #include "prefix.h" | |
718e3744 | 26 | #include "sockunion.h" |
27 | #include "thread.h" | |
28 | #include "log.h" | |
29 | #include "stream.h" | |
30 | #include "memory.h" | |
31 | #include "plist.h" | |
f188f2c4 | 32 | #include "workqueue.h" |
3f9c7369 | 33 | #include "queue.h" |
039f3a34 | 34 | #include "filter.h" |
4dcadbef | 35 | #include "command.h" |
718e3744 | 36 | |
856ca177 | 37 | #include "lib/json.h" |
718e3744 | 38 | #include "bgpd/bgpd.h" |
39 | #include "bgpd/bgp_attr.h" | |
40 | #include "bgpd/bgp_debug.h" | |
41 | #include "bgpd/bgp_fsm.h" | |
42 | #include "bgpd/bgp_packet.h" | |
43 | #include "bgpd/bgp_network.h" | |
44 | #include "bgpd/bgp_route.h" | |
45 | #include "bgpd/bgp_dump.h" | |
46 | #include "bgpd/bgp_open.h" | |
f188f2c4 | 47 | #include "bgpd/bgp_advertise.h" |
3f9c7369 | 48 | #include "bgpd/bgp_updgrp.h" |
ffd0c037 | 49 | #include "bgpd/bgp_nht.h" |
c43ed2e4 | 50 | #include "bgpd/bgp_bfd.h" |
4a1ab8e4 | 51 | #include "bgpd/bgp_memory.h" |
03014d48 | 52 | #include "bgpd/bgp_keepalives.h" |
56257a44 | 53 | #include "bgpd/bgp_io.h" |
6b0655a2 | 54 | |
d62a17ae | 55 | DEFINE_HOOK(peer_backward_transition, (struct peer * peer), (peer)) |
56 | DEFINE_HOOK(peer_established, (struct peer * peer), (peer)) | |
3012671f | 57 | |
6403814c DS |
58 | /* Definition of display strings corresponding to FSM events. This should be |
59 | * kept consistent with the events defined in bgpd.h | |
60 | */ | |
d62a17ae | 61 | static const char *bgp_event_str[] = { |
62 | NULL, | |
63 | "BGP_Start", | |
64 | "BGP_Stop", | |
65 | "TCP_connection_open", | |
66 | "TCP_connection_closed", | |
67 | "TCP_connection_open_failed", | |
68 | "TCP_fatal_error", | |
69 | "ConnectRetry_timer_expired", | |
70 | "Hold_Timer_expired", | |
71 | "KeepAlive_timer_expired", | |
72 | "Receive_OPEN_message", | |
73 | "Receive_KEEPALIVE_message", | |
74 | "Receive_UPDATE_message", | |
75 | "Receive_NOTIFICATION_message", | |
76 | "Clearing_Completed", | |
6403814c DS |
77 | }; |
78 | ||
718e3744 | 79 | /* BGP FSM (finite state machine) has three types of functions. Type |
80 | one is thread functions. Type two is event functions. Type three | |
81 | is FSM functions. Timer functions are set by bgp_timer_set | |
82 | function. */ | |
83 | ||
84 | /* BGP event function. */ | |
d62a17ae | 85 | int bgp_event(struct thread *); |
718e3744 | 86 | |
87 | /* BGP thread functions. */ | |
d62a17ae | 88 | static int bgp_start_timer(struct thread *); |
89 | static int bgp_connect_timer(struct thread *); | |
90 | static int bgp_holdtime_timer(struct thread *); | |
718e3744 | 91 | |
92 | /* BGP FSM functions. */ | |
d62a17ae | 93 | static int bgp_start(struct peer *); |
718e3744 | 94 | |
d62a17ae | 95 | static void peer_xfer_stats(struct peer *peer_dst, struct peer *peer_src) |
1ff9a340 | 96 | { |
d62a17ae | 97 | /* Copy stats over. These are only the pre-established state stats */ |
98 | peer_dst->open_in += peer_src->open_in; | |
99 | peer_dst->open_out += peer_src->open_out; | |
100 | peer_dst->keepalive_in += peer_src->keepalive_in; | |
101 | peer_dst->keepalive_out += peer_src->keepalive_out; | |
102 | peer_dst->notify_in += peer_src->notify_in; | |
103 | peer_dst->notify_out += peer_src->notify_out; | |
104 | peer_dst->dynamic_cap_in += peer_src->dynamic_cap_in; | |
105 | peer_dst->dynamic_cap_out += peer_src->dynamic_cap_out; | |
1ff9a340 DS |
106 | } |
107 | ||
d62a17ae | 108 | static struct peer *peer_xfer_conn(struct peer *from_peer) |
1ff9a340 | 109 | { |
d62a17ae | 110 | struct peer *peer; |
111 | afi_t afi; | |
112 | safi_t safi; | |
113 | int fd; | |
114 | int status, pstatus; | |
115 | unsigned char last_evt, last_maj_evt; | |
116 | ||
117 | assert(from_peer != NULL); | |
118 | ||
119 | peer = from_peer->doppelganger; | |
120 | ||
121 | if (!peer || !CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE)) | |
122 | return from_peer; | |
123 | ||
124 | if (bgp_debug_neighbor_events(peer)) | |
125 | zlog_debug("%s: peer transfer %p fd %d -> %p fd %d)", | |
126 | from_peer->host, from_peer, from_peer->fd, peer, | |
127 | peer->fd); | |
128 | ||
424ab01d QY |
129 | bgp_writes_off(peer); |
130 | bgp_reads_off(peer); | |
131 | bgp_writes_off(from_peer); | |
132 | bgp_reads_off(from_peer); | |
d62a17ae | 133 | |
134 | BGP_TIMER_OFF(peer->t_routeadv); | |
424ab01d QY |
135 | BGP_TIMER_OFF(peer->t_connect); |
136 | BGP_TIMER_OFF(peer->t_connect_check); | |
d62a17ae | 137 | BGP_TIMER_OFF(from_peer->t_routeadv); |
424ab01d QY |
138 | BGP_TIMER_OFF(from_peer->t_connect); |
139 | BGP_TIMER_OFF(from_peer->t_connect_check); | |
d3ecc69e | 140 | |
becedef6 QY |
141 | /* |
142 | * At this point in time, it is possible that there are packets pending | |
143 | * on various buffers. Those need to be transferred or dropped, | |
144 | * otherwise we'll get spurious failures during session establishment. | |
145 | */ | |
424ab01d QY |
146 | pthread_mutex_lock(&peer->io_mtx); |
147 | pthread_mutex_lock(&from_peer->io_mtx); | |
d3ecc69e | 148 | { |
424ab01d QY |
149 | fd = peer->fd; |
150 | peer->fd = from_peer->fd; | |
151 | from_peer->fd = fd; | |
152 | ||
153 | stream_fifo_clean(peer->ibuf); | |
d3ecc69e | 154 | stream_fifo_clean(peer->obuf); |
424ab01d | 155 | stream_reset(peer->ibuf_work); |
d3ecc69e | 156 | |
becedef6 QY |
157 | /* |
158 | * this should never happen, since bgp_process_packet() is the | |
159 | * only task that sets and unsets the current packet and it | |
160 | * runs in our pthread. | |
161 | */ | |
424ab01d QY |
162 | if (peer->curr) { |
163 | zlog_err( | |
164 | "[%s] Dropping pending packet on connection transfer:", | |
165 | peer->host); | |
166 | u_int16_t type = stream_getc_from(peer->curr, | |
167 | BGP_MARKER_SIZE + 2); | |
168 | bgp_dump_packet(peer, type, peer->curr); | |
169 | stream_free(peer->curr); | |
170 | peer->curr = NULL; | |
171 | } | |
172 | ||
173 | // copy each packet from old peer's output queue to new peer | |
727c4f87 QY |
174 | while (from_peer->obuf->head) |
175 | stream_fifo_push(peer->obuf, | |
176 | stream_fifo_pop(from_peer->obuf)); | |
424ab01d QY |
177 | |
178 | // copy each packet from old peer's input queue to new peer | |
179 | while (from_peer->ibuf->head) | |
180 | stream_fifo_push(peer->ibuf, | |
181 | stream_fifo_pop(from_peer->ibuf)); | |
d3ecc69e | 182 | } |
424ab01d QY |
183 | pthread_mutex_unlock(&from_peer->io_mtx); |
184 | pthread_mutex_unlock(&peer->io_mtx); | |
d62a17ae | 185 | |
186 | peer->as = from_peer->as; | |
187 | peer->v_holdtime = from_peer->v_holdtime; | |
188 | peer->v_keepalive = from_peer->v_keepalive; | |
189 | peer->routeadv = from_peer->routeadv; | |
190 | peer->v_routeadv = from_peer->v_routeadv; | |
191 | peer->v_gr_restart = from_peer->v_gr_restart; | |
192 | peer->cap = from_peer->cap; | |
193 | status = peer->status; | |
194 | pstatus = peer->ostatus; | |
195 | last_evt = peer->last_event; | |
196 | last_maj_evt = peer->last_major_event; | |
197 | peer->status = from_peer->status; | |
198 | peer->ostatus = from_peer->ostatus; | |
199 | peer->last_event = from_peer->last_event; | |
200 | peer->last_major_event = from_peer->last_major_event; | |
201 | from_peer->status = status; | |
202 | from_peer->ostatus = pstatus; | |
203 | from_peer->last_event = last_evt; | |
204 | from_peer->last_major_event = last_maj_evt; | |
205 | peer->remote_id = from_peer->remote_id; | |
206 | ||
207 | if (from_peer->hostname != NULL) { | |
208 | if (peer->hostname) { | |
209 | XFREE(MTYPE_BGP_PEER_HOST, peer->hostname); | |
210 | peer->hostname = NULL; | |
211 | } | |
212 | ||
213 | peer->hostname = from_peer->hostname; | |
214 | from_peer->hostname = NULL; | |
215 | } | |
216 | ||
217 | if (from_peer->domainname != NULL) { | |
218 | if (peer->domainname) { | |
219 | XFREE(MTYPE_BGP_PEER_HOST, peer->domainname); | |
220 | peer->domainname = NULL; | |
221 | } | |
222 | ||
223 | peer->domainname = from_peer->domainname; | |
224 | from_peer->domainname = NULL; | |
225 | } | |
226 | ||
05c7a1cc QY |
227 | FOREACH_AFI_SAFI (afi, safi) { |
228 | peer->af_flags[afi][safi] = from_peer->af_flags[afi][safi]; | |
229 | peer->af_sflags[afi][safi] = from_peer->af_sflags[afi][safi]; | |
230 | peer->af_cap[afi][safi] = from_peer->af_cap[afi][safi]; | |
231 | peer->afc_nego[afi][safi] = from_peer->afc_nego[afi][safi]; | |
232 | peer->afc_adv[afi][safi] = from_peer->afc_adv[afi][safi]; | |
233 | peer->afc_recv[afi][safi] = from_peer->afc_recv[afi][safi]; | |
234 | peer->orf_plist[afi][safi] = from_peer->orf_plist[afi][safi]; | |
235 | } | |
d62a17ae | 236 | |
237 | if (bgp_getsockname(peer) < 0) { | |
238 | zlog_err( | |
239 | "%%bgp_getsockname() failed for %s peer %s fd %d (from_peer fd %d)", | |
240 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER) | |
241 | ? "accept" | |
242 | : ""), | |
243 | peer->host, peer->fd, from_peer->fd); | |
244 | bgp_stop(peer); | |
245 | bgp_stop(from_peer); | |
246 | return NULL; | |
247 | } | |
248 | if (from_peer->status > Active) { | |
249 | if (bgp_getsockname(from_peer) < 0) { | |
250 | zlog_err( | |
251 | "%%bgp_getsockname() failed for %s from_peer %s fd %d (peer fd %d)", | |
252 | (CHECK_FLAG(from_peer->sflags, | |
253 | PEER_STATUS_ACCEPT_PEER) | |
254 | ? "accept" | |
255 | : ""), | |
256 | from_peer->host, from_peer->fd, peer->fd); | |
257 | bgp_stop(from_peer); | |
258 | from_peer = NULL; | |
259 | } | |
260 | } | |
261 | ||
424ab01d QY |
262 | bgp_reads_on(peer); |
263 | bgp_writes_on(peer); | |
d62a17ae | 264 | |
265 | if (from_peer) | |
266 | peer_xfer_stats(peer, from_peer); | |
267 | ||
268 | return (peer); | |
1ff9a340 DS |
269 | } |
270 | ||
718e3744 | 271 | /* Hook function called after bgp event is occered. And vty's |
272 | neighbor command invoke this function after making neighbor | |
273 | structure. */ | |
d62a17ae | 274 | void bgp_timer_set(struct peer *peer) |
718e3744 | 275 | { |
d62a17ae | 276 | switch (peer->status) { |
277 | case Idle: | |
278 | /* First entry point of peer's finite state machine. In Idle | |
279 | status start timer is on unless peer is shutdown or peer is | |
280 | inactive. All other timer must be turned off */ | |
281 | if (BGP_PEER_START_SUPPRESSED(peer) || !peer_active(peer)) { | |
282 | BGP_TIMER_OFF(peer->t_start); | |
283 | } else { | |
284 | BGP_TIMER_ON(peer->t_start, bgp_start_timer, | |
285 | peer->v_start); | |
286 | } | |
287 | BGP_TIMER_OFF(peer->t_connect); | |
288 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 289 | bgp_keepalives_off(peer); |
d62a17ae | 290 | BGP_TIMER_OFF(peer->t_routeadv); |
291 | break; | |
292 | ||
293 | case Connect: | |
294 | /* After start timer is expired, the peer moves to Connect | |
295 | status. Make sure start timer is off and connect timer is | |
296 | on. */ | |
297 | BGP_TIMER_OFF(peer->t_start); | |
298 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
299 | peer->v_connect); | |
300 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 301 | bgp_keepalives_off(peer); |
d62a17ae | 302 | BGP_TIMER_OFF(peer->t_routeadv); |
303 | break; | |
304 | ||
305 | case Active: | |
306 | /* Active is waiting connection from remote peer. And if | |
307 | connect timer is expired, change status to Connect. */ | |
308 | BGP_TIMER_OFF(peer->t_start); | |
309 | /* If peer is passive mode, do not set connect timer. */ | |
310 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE) | |
311 | || CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
312 | BGP_TIMER_OFF(peer->t_connect); | |
313 | } else { | |
314 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
315 | peer->v_connect); | |
316 | } | |
317 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 318 | bgp_keepalives_off(peer); |
d62a17ae | 319 | BGP_TIMER_OFF(peer->t_routeadv); |
320 | break; | |
321 | ||
322 | case OpenSent: | |
323 | /* OpenSent status. */ | |
324 | BGP_TIMER_OFF(peer->t_start); | |
325 | BGP_TIMER_OFF(peer->t_connect); | |
326 | if (peer->v_holdtime != 0) { | |
327 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
328 | peer->v_holdtime); | |
329 | } else { | |
330 | BGP_TIMER_OFF(peer->t_holdtime); | |
331 | } | |
b72b6f4f | 332 | bgp_keepalives_off(peer); |
d62a17ae | 333 | BGP_TIMER_OFF(peer->t_routeadv); |
334 | break; | |
335 | ||
336 | case OpenConfirm: | |
337 | /* OpenConfirm status. */ | |
338 | BGP_TIMER_OFF(peer->t_start); | |
339 | BGP_TIMER_OFF(peer->t_connect); | |
340 | ||
341 | /* If the negotiated Hold Time value is zero, then the Hold Time | |
342 | timer and KeepAlive timers are not started. */ | |
343 | if (peer->v_holdtime == 0) { | |
344 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 345 | bgp_keepalives_off(peer); |
d62a17ae | 346 | } else { |
347 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
348 | peer->v_holdtime); | |
b72b6f4f | 349 | bgp_keepalives_on(peer); |
d62a17ae | 350 | } |
351 | BGP_TIMER_OFF(peer->t_routeadv); | |
352 | break; | |
353 | ||
354 | case Established: | |
355 | /* In Established status start and connect timer is turned | |
356 | off. */ | |
357 | BGP_TIMER_OFF(peer->t_start); | |
358 | BGP_TIMER_OFF(peer->t_connect); | |
359 | ||
360 | /* Same as OpenConfirm, if holdtime is zero then both holdtime | |
361 | and keepalive must be turned off. */ | |
362 | if (peer->v_holdtime == 0) { | |
363 | BGP_TIMER_OFF(peer->t_holdtime); | |
bea01226 | 364 | bgp_keepalives_off(peer); |
d62a17ae | 365 | } else { |
366 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
367 | peer->v_holdtime); | |
bea01226 | 368 | bgp_keepalives_on(peer); |
d62a17ae | 369 | } |
370 | break; | |
371 | case Deleted: | |
372 | BGP_TIMER_OFF(peer->t_gr_restart); | |
373 | BGP_TIMER_OFF(peer->t_gr_stale); | |
374 | BGP_TIMER_OFF(peer->t_pmax_restart); | |
375 | /* fallthru */ | |
376 | case Clearing: | |
377 | BGP_TIMER_OFF(peer->t_start); | |
378 | BGP_TIMER_OFF(peer->t_connect); | |
379 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 380 | bgp_keepalives_off(peer); |
d62a17ae | 381 | BGP_TIMER_OFF(peer->t_routeadv); |
382 | break; | |
718e3744 | 383 | } |
718e3744 | 384 | } |
385 | ||
386 | /* BGP start timer. This function set BGP_Start event to thread value | |
387 | and process event. */ | |
d62a17ae | 388 | static int bgp_start_timer(struct thread *thread) |
718e3744 | 389 | { |
d62a17ae | 390 | struct peer *peer; |
718e3744 | 391 | |
d62a17ae | 392 | peer = THREAD_ARG(thread); |
393 | peer->t_start = NULL; | |
718e3744 | 394 | |
d62a17ae | 395 | if (bgp_debug_neighbor_events(peer)) |
396 | zlog_debug("%s [FSM] Timer (start timer expire).", peer->host); | |
718e3744 | 397 | |
d62a17ae | 398 | THREAD_VAL(thread) = BGP_Start; |
399 | bgp_event(thread); /* bgp_event unlocks peer */ | |
718e3744 | 400 | |
d62a17ae | 401 | return 0; |
718e3744 | 402 | } |
403 | ||
404 | /* BGP connect retry timer. */ | |
d62a17ae | 405 | static int bgp_connect_timer(struct thread *thread) |
718e3744 | 406 | { |
d62a17ae | 407 | struct peer *peer; |
408 | int ret; | |
409 | ||
410 | peer = THREAD_ARG(thread); | |
424ab01d QY |
411 | |
412 | assert(!peer->t_write); | |
413 | assert(!peer->t_read); | |
414 | ||
d62a17ae | 415 | peer->t_connect = NULL; |
416 | ||
417 | if (bgp_debug_neighbor_events(peer)) | |
418 | zlog_debug("%s [FSM] Timer (connect timer expire)", peer->host); | |
419 | ||
420 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) { | |
421 | bgp_stop(peer); | |
422 | ret = -1; | |
423 | } else { | |
424 | THREAD_VAL(thread) = ConnectRetry_timer_expired; | |
425 | bgp_event(thread); /* bgp_event unlocks peer */ | |
426 | ret = 0; | |
427 | } | |
428 | ||
429 | return ret; | |
718e3744 | 430 | } |
431 | ||
432 | /* BGP holdtime timer. */ | |
d62a17ae | 433 | static int bgp_holdtime_timer(struct thread *thread) |
718e3744 | 434 | { |
d62a17ae | 435 | struct peer *peer; |
718e3744 | 436 | |
d62a17ae | 437 | peer = THREAD_ARG(thread); |
438 | peer->t_holdtime = NULL; | |
718e3744 | 439 | |
d62a17ae | 440 | if (bgp_debug_neighbor_events(peer)) |
441 | zlog_debug("%s [FSM] Timer (holdtime timer expire)", | |
442 | peer->host); | |
718e3744 | 443 | |
d62a17ae | 444 | THREAD_VAL(thread) = Hold_Timer_expired; |
445 | bgp_event(thread); /* bgp_event unlocks peer */ | |
718e3744 | 446 | |
d62a17ae | 447 | return 0; |
718e3744 | 448 | } |
449 | ||
d62a17ae | 450 | int bgp_routeadv_timer(struct thread *thread) |
718e3744 | 451 | { |
d62a17ae | 452 | struct peer *peer; |
718e3744 | 453 | |
d62a17ae | 454 | peer = THREAD_ARG(thread); |
455 | peer->t_routeadv = NULL; | |
718e3744 | 456 | |
d62a17ae | 457 | if (bgp_debug_neighbor_events(peer)) |
458 | zlog_debug("%s [FSM] Timer (routeadv timer expire)", | |
459 | peer->host); | |
718e3744 | 460 | |
d62a17ae | 461 | peer->synctime = bgp_clock(); |
718e3744 | 462 | |
a9794991 | 463 | thread_add_timer_msec(bm->master, bgp_generate_updgrp_packets, peer, 0, |
424ab01d QY |
464 | &peer->t_generate_updgrp_packets); |
465 | ||
d62a17ae | 466 | /* MRAI timer will be started again when FIFO is built, no need to |
467 | * do it here. | |
468 | */ | |
469 | return 0; | |
718e3744 | 470 | } |
471 | ||
e0701b79 | 472 | /* BGP Peer Down Cause */ |
d62a17ae | 473 | const char *peer_down_str[] = {"", |
474 | "Router ID changed", | |
475 | "Remote AS changed", | |
476 | "Local AS change", | |
477 | "Cluster ID changed", | |
478 | "Confederation identifier changed", | |
479 | "Confederation peer changed", | |
480 | "RR client config change", | |
481 | "RS client config change", | |
482 | "Update source change", | |
483 | "Address family activated", | |
484 | "Admin. shutdown", | |
485 | "User reset", | |
486 | "BGP Notification received", | |
487 | "BGP Notification send", | |
488 | "Peer closed the session", | |
489 | "Neighbor deleted", | |
490 | "Peer-group add member", | |
491 | "Peer-group delete member", | |
492 | "Capability changed", | |
493 | "Passive config change", | |
494 | "Multihop config change", | |
495 | "NSF peer closed the session", | |
496 | "Intf peering v6only config change", | |
497 | "BFD down received", | |
498 | "Interface down", | |
499 | "Neighbor address lost"}; | |
500 | ||
501 | static int bgp_graceful_restart_timer_expire(struct thread *thread) | |
e0701b79 | 502 | { |
d62a17ae | 503 | struct peer *peer; |
504 | afi_t afi; | |
505 | safi_t safi; | |
506 | ||
507 | peer = THREAD_ARG(thread); | |
508 | peer->t_gr_restart = NULL; | |
509 | ||
510 | /* NSF delete stale route */ | |
511 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 512 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) |
d62a17ae | 513 | if (peer->nsf[afi][safi]) |
514 | bgp_clear_stale_route(peer, afi, safi); | |
515 | ||
516 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
517 | BGP_TIMER_OFF(peer->t_gr_stale); | |
518 | ||
519 | if (bgp_debug_neighbor_events(peer)) { | |
520 | zlog_debug("%s graceful restart timer expired", peer->host); | |
521 | zlog_debug("%s graceful restart stalepath timer stopped", | |
522 | peer->host); | |
523 | } | |
93406d87 | 524 | |
d62a17ae | 525 | bgp_timer_set(peer); |
93406d87 | 526 | |
d62a17ae | 527 | return 0; |
93406d87 | 528 | } |
529 | ||
d62a17ae | 530 | static int bgp_graceful_stale_timer_expire(struct thread *thread) |
93406d87 | 531 | { |
d62a17ae | 532 | struct peer *peer; |
533 | afi_t afi; | |
534 | safi_t safi; | |
93406d87 | 535 | |
d62a17ae | 536 | peer = THREAD_ARG(thread); |
537 | peer->t_gr_stale = NULL; | |
93406d87 | 538 | |
d62a17ae | 539 | if (bgp_debug_neighbor_events(peer)) |
540 | zlog_debug("%s graceful restart stalepath timer expired", | |
541 | peer->host); | |
93406d87 | 542 | |
d62a17ae | 543 | /* NSF delete stale route */ |
544 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 545 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) |
d62a17ae | 546 | if (peer->nsf[afi][safi]) |
547 | bgp_clear_stale_route(peer, afi, safi); | |
93406d87 | 548 | |
d62a17ae | 549 | return 0; |
93406d87 | 550 | } |
551 | ||
d62a17ae | 552 | static int bgp_update_delay_applicable(struct bgp *bgp) |
f188f2c4 | 553 | { |
d62a17ae | 554 | /* update_delay_over flag should be reset (set to 0) for any new |
555 | applicability of the update-delay during BGP process lifetime. | |
556 | And it should be set after an occurence of the update-delay is | |
557 | over)*/ | |
558 | if (!bgp->update_delay_over) | |
559 | return 1; | |
560 | ||
561 | return 0; | |
f188f2c4 DS |
562 | } |
563 | ||
d62a17ae | 564 | int bgp_update_delay_active(struct bgp *bgp) |
f188f2c4 | 565 | { |
d62a17ae | 566 | if (bgp->t_update_delay) |
567 | return 1; | |
f188f2c4 | 568 | |
d62a17ae | 569 | return 0; |
f188f2c4 DS |
570 | } |
571 | ||
d62a17ae | 572 | int bgp_update_delay_configured(struct bgp *bgp) |
f188f2c4 | 573 | { |
d62a17ae | 574 | if (bgp->v_update_delay) |
575 | return 1; | |
f188f2c4 | 576 | |
d62a17ae | 577 | return 0; |
f188f2c4 DS |
578 | } |
579 | ||
580 | /* Do the post-processing needed when bgp comes out of the read-only mode | |
581 | on ending the update delay. */ | |
d62a17ae | 582 | void bgp_update_delay_end(struct bgp *bgp) |
f188f2c4 | 583 | { |
d62a17ae | 584 | THREAD_TIMER_OFF(bgp->t_update_delay); |
585 | THREAD_TIMER_OFF(bgp->t_establish_wait); | |
586 | ||
587 | /* Reset update-delay related state */ | |
588 | bgp->update_delay_over = 1; | |
589 | bgp->established = 0; | |
590 | bgp->restarted_peers = 0; | |
591 | bgp->implicit_eors = 0; | |
592 | bgp->explicit_eors = 0; | |
593 | ||
594 | quagga_timestamp(3, bgp->update_delay_end_time, | |
595 | sizeof(bgp->update_delay_end_time)); | |
596 | ||
597 | /* | |
598 | * Add an end-of-initial-update marker to the main process queues so | |
599 | * that | |
600 | * the route advertisement timer for the peers can be started. Also set | |
601 | * the zebra and peer update hold flags. These flags are used to achieve | |
602 | * three stages in the update-delay post processing: | |
603 | * 1. Finish best-path selection for all the prefixes held on the | |
604 | * queues. | |
605 | * (routes in BGP are updated, and peers sync queues are populated | |
606 | * too) | |
607 | * 2. As the eoiu mark is reached in the bgp process routine, ship all | |
608 | * the | |
609 | * routes to zebra. With that zebra should see updates from BGP | |
610 | * close | |
611 | * to each other. | |
612 | * 3. Unblock the peer update writes. With that peer update packing | |
613 | * with | |
614 | * the prefixes should be at its maximum. | |
615 | */ | |
616 | bgp_add_eoiu_mark(bgp); | |
617 | bgp->main_zebra_update_hold = 1; | |
618 | bgp->main_peers_update_hold = 1; | |
619 | ||
620 | /* Resume the queue processing. This should trigger the event that would | |
621 | take | |
622 | care of processing any work that was queued during the read-only | |
623 | mode. */ | |
624 | work_queue_unplug(bm->process_main_queue); | |
f188f2c4 DS |
625 | } |
626 | ||
cb1faec9 DS |
627 | /** |
628 | * see bgp_fsm.h | |
629 | */ | |
d62a17ae | 630 | void bgp_start_routeadv(struct bgp *bgp) |
cb1faec9 | 631 | { |
d62a17ae | 632 | struct listnode *node, *nnode; |
633 | struct peer *peer; | |
cb1faec9 | 634 | |
d62a17ae | 635 | zlog_info("bgp_start_routeadv(), update hold status %d", |
636 | bgp->main_peers_update_hold); | |
4a16ae86 | 637 | |
d62a17ae | 638 | if (bgp->main_peers_update_hold) |
639 | return; | |
4a16ae86 | 640 | |
d62a17ae | 641 | quagga_timestamp(3, bgp->update_delay_peers_resume_time, |
642 | sizeof(bgp->update_delay_peers_resume_time)); | |
4a16ae86 | 643 | |
d62a17ae | 644 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) { |
645 | if (peer->status != Established) | |
646 | continue; | |
647 | BGP_TIMER_OFF(peer->t_routeadv); | |
648 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
649 | } | |
cb1faec9 DS |
650 | } |
651 | ||
652 | /** | |
653 | * see bgp_fsm.h | |
654 | */ | |
d62a17ae | 655 | void bgp_adjust_routeadv(struct peer *peer) |
cb1faec9 | 656 | { |
d62a17ae | 657 | time_t nowtime = bgp_clock(); |
658 | double diff; | |
659 | unsigned long remain; | |
660 | ||
661 | /* Bypass checks for special case of MRAI being 0 */ | |
662 | if (peer->v_routeadv == 0) { | |
663 | /* Stop existing timer, just in case it is running for a | |
664 | * different | |
665 | * duration and schedule write thread immediately. | |
666 | */ | |
667 | if (peer->t_routeadv) | |
668 | BGP_TIMER_OFF(peer->t_routeadv); | |
669 | ||
670 | peer->synctime = bgp_clock(); | |
a9794991 | 671 | thread_add_timer_msec(bm->master, bgp_generate_updgrp_packets, |
424ab01d QY |
672 | peer, 0, |
673 | &peer->t_generate_updgrp_packets); | |
d62a17ae | 674 | return; |
675 | } | |
676 | ||
677 | ||
678 | /* | |
679 | * CASE I: | |
680 | * If the last update was written more than MRAI back, expire the timer | |
681 | * instantly so that we can send the update out sooner. | |
682 | * | |
683 | * <------- MRAI ---------> | |
684 | * |-----------------|-----------------------| | |
685 | * <------------- m ------------> | |
686 | * ^ ^ ^ | |
687 | * | | | | |
688 | * | | current time | |
689 | * | timer start | |
690 | * last write | |
691 | * | |
692 | * m > MRAI | |
693 | */ | |
694 | diff = difftime(nowtime, peer->last_update); | |
695 | if (diff > (double)peer->v_routeadv) { | |
696 | BGP_TIMER_OFF(peer->t_routeadv); | |
697 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
698 | return; | |
699 | } | |
700 | ||
701 | /* | |
702 | * CASE II: | |
703 | * - Find when to expire the MRAI timer. | |
704 | * If MRAI timer is not active, assume we can start it now. | |
705 | * | |
706 | * <------- MRAI ---------> | |
707 | * |------------|-----------------------| | |
708 | * <-------- m ----------><----- r -----> | |
709 | * ^ ^ ^ | |
710 | * | | | | |
711 | * | | current time | |
712 | * | timer start | |
713 | * last write | |
714 | * | |
715 | * (MRAI - m) < r | |
716 | */ | |
717 | if (peer->t_routeadv) | |
718 | remain = thread_timer_remain_second(peer->t_routeadv); | |
719 | else | |
720 | remain = peer->v_routeadv; | |
721 | diff = peer->v_routeadv - diff; | |
722 | if (diff <= (double)remain) { | |
723 | BGP_TIMER_OFF(peer->t_routeadv); | |
724 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, diff); | |
725 | } | |
cb1faec9 DS |
726 | } |
727 | ||
d62a17ae | 728 | static int bgp_maxmed_onstartup_applicable(struct bgp *bgp) |
abc920f8 | 729 | { |
d62a17ae | 730 | if (!bgp->maxmed_onstartup_over) |
731 | return 1; | |
abc920f8 | 732 | |
d62a17ae | 733 | return 0; |
abc920f8 DS |
734 | } |
735 | ||
d62a17ae | 736 | int bgp_maxmed_onstartup_configured(struct bgp *bgp) |
abc920f8 | 737 | { |
d62a17ae | 738 | if (bgp->v_maxmed_onstartup != BGP_MAXMED_ONSTARTUP_UNCONFIGURED) |
739 | return 1; | |
abc920f8 | 740 | |
d62a17ae | 741 | return 0; |
abc920f8 DS |
742 | } |
743 | ||
d62a17ae | 744 | int bgp_maxmed_onstartup_active(struct bgp *bgp) |
abc920f8 | 745 | { |
d62a17ae | 746 | if (bgp->t_maxmed_onstartup) |
747 | return 1; | |
abc920f8 | 748 | |
d62a17ae | 749 | return 0; |
abc920f8 DS |
750 | } |
751 | ||
d62a17ae | 752 | void bgp_maxmed_update(struct bgp *bgp) |
abc920f8 | 753 | { |
d62a17ae | 754 | u_char maxmed_active; |
755 | u_int32_t maxmed_value; | |
756 | ||
757 | if (bgp->v_maxmed_admin) { | |
758 | maxmed_active = 1; | |
759 | maxmed_value = bgp->maxmed_admin_value; | |
760 | } else if (bgp->t_maxmed_onstartup) { | |
761 | maxmed_active = 1; | |
762 | maxmed_value = bgp->maxmed_onstartup_value; | |
763 | } else { | |
764 | maxmed_active = 0; | |
765 | maxmed_value = BGP_MAXMED_VALUE_DEFAULT; | |
766 | } | |
767 | ||
768 | if (bgp->maxmed_active != maxmed_active | |
769 | || bgp->maxmed_value != maxmed_value) { | |
770 | bgp->maxmed_active = maxmed_active; | |
771 | bgp->maxmed_value = maxmed_value; | |
772 | ||
773 | update_group_announce(bgp); | |
774 | } | |
abc920f8 DS |
775 | } |
776 | ||
777 | /* The maxmed onstartup timer expiry callback. */ | |
d62a17ae | 778 | static int bgp_maxmed_onstartup_timer(struct thread *thread) |
abc920f8 | 779 | { |
d62a17ae | 780 | struct bgp *bgp; |
abc920f8 | 781 | |
d62a17ae | 782 | zlog_info("Max med on startup ended - timer expired."); |
abc920f8 | 783 | |
d62a17ae | 784 | bgp = THREAD_ARG(thread); |
785 | THREAD_TIMER_OFF(bgp->t_maxmed_onstartup); | |
786 | bgp->maxmed_onstartup_over = 1; | |
abc920f8 | 787 | |
d62a17ae | 788 | bgp_maxmed_update(bgp); |
abc920f8 | 789 | |
d62a17ae | 790 | return 0; |
abc920f8 DS |
791 | } |
792 | ||
d62a17ae | 793 | static void bgp_maxmed_onstartup_begin(struct bgp *bgp) |
abc920f8 | 794 | { |
d62a17ae | 795 | /* Applicable only once in the process lifetime on the startup */ |
796 | if (bgp->maxmed_onstartup_over) | |
797 | return; | |
abc920f8 | 798 | |
d62a17ae | 799 | zlog_info("Begin maxmed onstartup mode - timer %d seconds", |
800 | bgp->v_maxmed_onstartup); | |
abc920f8 | 801 | |
d62a17ae | 802 | thread_add_timer(bm->master, bgp_maxmed_onstartup_timer, bgp, |
803 | bgp->v_maxmed_onstartup, &bgp->t_maxmed_onstartup); | |
abc920f8 | 804 | |
d62a17ae | 805 | if (!bgp->v_maxmed_admin) { |
806 | bgp->maxmed_active = 1; | |
807 | bgp->maxmed_value = bgp->maxmed_onstartup_value; | |
808 | } | |
abc920f8 | 809 | |
d62a17ae | 810 | /* Route announce to all peers should happen after this in |
811 | * bgp_establish() */ | |
abc920f8 DS |
812 | } |
813 | ||
d62a17ae | 814 | static void bgp_maxmed_onstartup_process_status_change(struct peer *peer) |
abc920f8 | 815 | { |
d62a17ae | 816 | if (peer->status == Established && !peer->bgp->established) { |
817 | bgp_maxmed_onstartup_begin(peer->bgp); | |
818 | } | |
abc920f8 DS |
819 | } |
820 | ||
f188f2c4 | 821 | /* The update delay timer expiry callback. */ |
d62a17ae | 822 | static int bgp_update_delay_timer(struct thread *thread) |
f188f2c4 | 823 | { |
d62a17ae | 824 | struct bgp *bgp; |
f188f2c4 | 825 | |
d62a17ae | 826 | zlog_info("Update delay ended - timer expired."); |
f188f2c4 | 827 | |
d62a17ae | 828 | bgp = THREAD_ARG(thread); |
829 | THREAD_TIMER_OFF(bgp->t_update_delay); | |
830 | bgp_update_delay_end(bgp); | |
f188f2c4 | 831 | |
d62a17ae | 832 | return 0; |
f188f2c4 DS |
833 | } |
834 | ||
835 | /* The establish wait timer expiry callback. */ | |
d62a17ae | 836 | static int bgp_establish_wait_timer(struct thread *thread) |
f188f2c4 | 837 | { |
d62a17ae | 838 | struct bgp *bgp; |
f188f2c4 | 839 | |
d62a17ae | 840 | zlog_info("Establish wait - timer expired."); |
f188f2c4 | 841 | |
d62a17ae | 842 | bgp = THREAD_ARG(thread); |
843 | THREAD_TIMER_OFF(bgp->t_establish_wait); | |
844 | bgp_check_update_delay(bgp); | |
f188f2c4 | 845 | |
d62a17ae | 846 | return 0; |
f188f2c4 DS |
847 | } |
848 | ||
849 | /* Steps to begin the update delay: | |
850 | - initialize queues if needed | |
851 | - stop the queue processing | |
852 | - start the timer */ | |
d62a17ae | 853 | static void bgp_update_delay_begin(struct bgp *bgp) |
f188f2c4 | 854 | { |
d62a17ae | 855 | struct listnode *node, *nnode; |
856 | struct peer *peer; | |
f188f2c4 | 857 | |
d62a17ae | 858 | /* Stop the processing of queued work. Enqueue shall continue */ |
859 | work_queue_plug(bm->process_main_queue); | |
f188f2c4 | 860 | |
d62a17ae | 861 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) |
862 | peer->update_delay_over = 0; | |
f188f2c4 | 863 | |
d62a17ae | 864 | /* Start the update-delay timer */ |
865 | thread_add_timer(bm->master, bgp_update_delay_timer, bgp, | |
866 | bgp->v_update_delay, &bgp->t_update_delay); | |
f188f2c4 | 867 | |
d62a17ae | 868 | if (bgp->v_establish_wait != bgp->v_update_delay) |
869 | thread_add_timer(bm->master, bgp_establish_wait_timer, bgp, | |
870 | bgp->v_establish_wait, &bgp->t_establish_wait); | |
f188f2c4 | 871 | |
d62a17ae | 872 | quagga_timestamp(3, bgp->update_delay_begin_time, |
873 | sizeof(bgp->update_delay_begin_time)); | |
f188f2c4 DS |
874 | } |
875 | ||
d62a17ae | 876 | static void bgp_update_delay_process_status_change(struct peer *peer) |
f188f2c4 | 877 | { |
d62a17ae | 878 | if (peer->status == Established) { |
879 | if (!peer->bgp->established++) { | |
880 | bgp_update_delay_begin(peer->bgp); | |
881 | zlog_info( | |
882 | "Begin read-only mode - update-delay timer %d seconds", | |
883 | peer->bgp->v_update_delay); | |
884 | } | |
885 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_BIT_RCV)) | |
886 | bgp_update_restarted_peers(peer); | |
887 | } | |
888 | if (peer->ostatus == Established | |
889 | && bgp_update_delay_active(peer->bgp)) { | |
890 | /* Adjust the update-delay state to account for this flap. | |
891 | NOTE: Intentionally skipping adjusting implicit_eors or | |
892 | explicit_eors | |
893 | counters. Extra sanity check in bgp_check_update_delay() | |
894 | should | |
895 | be enough to take care of any additive discrepancy in bgp eor | |
896 | counters */ | |
897 | peer->bgp->established--; | |
898 | peer->update_delay_over = 0; | |
899 | } | |
f188f2c4 DS |
900 | } |
901 | ||
200df115 | 902 | /* Called after event occured, this function change status and reset |
903 | read/write and timer thread. */ | |
d62a17ae | 904 | void bgp_fsm_change_status(struct peer *peer, int status) |
200df115 | 905 | { |
1ff9a340 | 906 | |
d62a17ae | 907 | bgp_dump_state(peer, peer->status, status); |
908 | ||
909 | /* Transition into Clearing or Deleted must /always/ clear all routes.. | |
910 | * (and must do so before actually changing into Deleted.. | |
911 | */ | |
912 | if (status >= Clearing) { | |
913 | bgp_clear_route_all(peer); | |
914 | ||
915 | /* If no route was queued for the clear-node processing, | |
916 | * generate the | |
917 | * completion event here. This is needed because if there are no | |
918 | * routes | |
919 | * to trigger the background clear-node thread, the event won't | |
920 | * get | |
921 | * generated and the peer would be stuck in Clearing. Note that | |
922 | * this | |
923 | * event is for the peer and helps the peer transition out of | |
924 | * Clearing | |
925 | * state; it should not be generated per (AFI,SAFI). The event | |
926 | * is | |
927 | * directly posted here without calling clear_node_complete() as | |
928 | * we | |
929 | * shouldn't do an extra unlock. This event will get processed | |
930 | * after | |
931 | * the state change that happens below, so peer will be in | |
932 | * Clearing | |
933 | * (or Deleted). | |
934 | */ | |
935 | if (!work_queue_is_scheduled(peer->clear_node_queue)) | |
936 | BGP_EVENT_ADD(peer, Clearing_Completed); | |
937 | } | |
938 | ||
939 | /* Preserve old status and change into new status. */ | |
940 | peer->ostatus = peer->status; | |
941 | peer->status = status; | |
942 | ||
943 | /* Save event that caused status change. */ | |
944 | peer->last_major_event = peer->cur_event; | |
945 | ||
946 | if (status == Established) | |
947 | UNSET_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER); | |
948 | ||
949 | /* If max-med processing is applicable, do the necessary. */ | |
950 | if (status == Established) { | |
951 | if (bgp_maxmed_onstartup_configured(peer->bgp) | |
952 | && bgp_maxmed_onstartup_applicable(peer->bgp)) | |
953 | bgp_maxmed_onstartup_process_status_change(peer); | |
954 | else | |
955 | peer->bgp->maxmed_onstartup_over = 1; | |
956 | } | |
957 | ||
958 | /* If update-delay processing is applicable, do the necessary. */ | |
959 | if (bgp_update_delay_configured(peer->bgp) | |
960 | && bgp_update_delay_applicable(peer->bgp)) | |
961 | bgp_update_delay_process_status_change(peer); | |
962 | ||
963 | if (bgp_debug_neighbor_events(peer)) | |
964 | zlog_debug("%s went from %s to %s", peer->host, | |
965 | lookup_msg(bgp_status_msg, peer->ostatus, NULL), | |
966 | lookup_msg(bgp_status_msg, peer->status, NULL)); | |
200df115 | 967 | } |
968 | ||
3117b5c4 | 969 | /* Flush the event queue and ensure the peer is shut down */ |
d62a17ae | 970 | static int bgp_clearing_completed(struct peer *peer) |
3117b5c4 | 971 | { |
d62a17ae | 972 | int rc = bgp_stop(peer); |
1ff9a340 | 973 | |
d62a17ae | 974 | if (rc >= 0) |
975 | BGP_EVENT_FLUSH(peer); | |
3117b5c4 | 976 | |
d62a17ae | 977 | return rc; |
3117b5c4 SH |
978 | } |
979 | ||
718e3744 | 980 | /* Administrative BGP peer stop event. */ |
3117b5c4 | 981 | /* May be called multiple times for the same peer */ |
d62a17ae | 982 | int bgp_stop(struct peer *peer) |
718e3744 | 983 | { |
d62a17ae | 984 | afi_t afi; |
985 | safi_t safi; | |
986 | char orf_name[BUFSIZ]; | |
987 | int ret = 0; | |
988 | ||
989 | if (peer_dynamic_neighbor(peer) | |
990 | && !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
991 | if (bgp_debug_neighbor_events(peer)) | |
992 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
993 | peer_delete(peer); | |
994 | return -1; | |
c22767d8 | 995 | } |
848973c7 | 996 | |
d62a17ae | 997 | /* Can't do this in Clearing; events are used for state transitions */ |
998 | if (peer->status != Clearing) { | |
999 | /* Delete all existing events of the peer */ | |
1000 | BGP_EVENT_FLUSH(peer); | |
93406d87 | 1001 | } |
d62a17ae | 1002 | |
1003 | /* Increment Dropped count. */ | |
1004 | if (peer->status == Established) { | |
1005 | peer->dropped++; | |
1006 | ||
1007 | /* bgp log-neighbor-changes of neighbor Down */ | |
1008 | if (bgp_flag_check(peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { | |
1009 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); | |
1010 | zlog_info( | |
1011 | "%%ADJCHANGE: neighbor %s(%s) in vrf %s Down %s", | |
1012 | peer->host, | |
1013 | (peer->hostname) ? peer->hostname : "Unknown", | |
1014 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) ? vrf->name | |
1015 | : "Default") | |
1016 | : "", | |
1017 | peer_down_str[(int)peer->last_reset]); | |
1018 | } | |
1019 | ||
1020 | /* graceful restart */ | |
1021 | if (peer->t_gr_stale) { | |
1022 | BGP_TIMER_OFF(peer->t_gr_stale); | |
1023 | if (bgp_debug_neighbor_events(peer)) | |
1024 | zlog_debug( | |
1025 | "%s graceful restart stalepath timer stopped", | |
1026 | peer->host); | |
1027 | } | |
1028 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
1029 | if (bgp_debug_neighbor_events(peer)) { | |
1030 | zlog_debug( | |
1031 | "%s graceful restart timer started for %d sec", | |
1032 | peer->host, peer->v_gr_restart); | |
1033 | zlog_debug( | |
1034 | "%s graceful restart stalepath timer started for %d sec", | |
1035 | peer->host, peer->bgp->stalepath_time); | |
1036 | } | |
1037 | BGP_TIMER_ON(peer->t_gr_restart, | |
1038 | bgp_graceful_restart_timer_expire, | |
1039 | peer->v_gr_restart); | |
1040 | BGP_TIMER_ON(peer->t_gr_stale, | |
1041 | bgp_graceful_stale_timer_expire, | |
1042 | peer->bgp->stalepath_time); | |
1043 | } else { | |
1044 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1045 | ||
1046 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
1047 | for (safi = SAFI_UNICAST; | |
a08ca0a7 | 1048 | safi <= SAFI_MPLS_VPN; safi++) |
d62a17ae | 1049 | peer->nsf[afi][safi] = 0; |
1050 | } | |
1051 | ||
1052 | /* set last reset time */ | |
1053 | peer->resettime = peer->uptime = bgp_clock(); | |
1054 | ||
1055 | if (BGP_DEBUG(update_groups, UPDATE_GROUPS)) | |
1056 | zlog_debug("%s remove from all update group", | |
1057 | peer->host); | |
1058 | update_group_remove_peer_afs(peer); | |
1059 | ||
1060 | hook_call(peer_backward_transition, peer); | |
1061 | ||
1062 | /* Reset peer synctime */ | |
1063 | peer->synctime = 0; | |
1064 | ||
1065 | bgp_bfd_deregister_peer(peer); | |
93406d87 | 1066 | } |
93406d87 | 1067 | |
424ab01d | 1068 | /* stop keepalives */ |
b72b6f4f | 1069 | bgp_keepalives_off(peer); |
424ab01d QY |
1070 | |
1071 | /* Stop read and write threads. */ | |
1072 | bgp_writes_off(peer); | |
1073 | bgp_reads_off(peer); | |
1074 | ||
1075 | THREAD_OFF(peer->t_connect_check); | |
d62a17ae | 1076 | |
1077 | /* Stop all timers. */ | |
1078 | BGP_TIMER_OFF(peer->t_start); | |
1079 | BGP_TIMER_OFF(peer->t_connect); | |
1080 | BGP_TIMER_OFF(peer->t_holdtime); | |
d62a17ae | 1081 | BGP_TIMER_OFF(peer->t_routeadv); |
d62a17ae | 1082 | |
1083 | /* Clear input and output buffer. */ | |
424ab01d | 1084 | pthread_mutex_lock(&peer->io_mtx); |
d3ecc69e | 1085 | { |
424ab01d QY |
1086 | if (peer->ibuf) |
1087 | stream_fifo_clean(peer->ibuf); | |
d3ecc69e QY |
1088 | if (peer->obuf) |
1089 | stream_fifo_clean(peer->obuf); | |
424ab01d QY |
1090 | |
1091 | if (peer->ibuf_work) | |
1092 | stream_reset(peer->ibuf_work); | |
1093 | if (peer->obuf_work) | |
1094 | stream_reset(peer->obuf_work); | |
1095 | ||
1096 | if (peer->curr) { | |
1097 | stream_free(peer->curr); | |
1098 | peer->curr = NULL; | |
1099 | } | |
d3ecc69e | 1100 | } |
424ab01d | 1101 | pthread_mutex_unlock(&peer->io_mtx); |
d62a17ae | 1102 | |
1103 | /* Close of file descriptor. */ | |
1104 | if (peer->fd >= 0) { | |
1105 | close(peer->fd); | |
1106 | peer->fd = -1; | |
93406d87 | 1107 | } |
1108 | ||
05c7a1cc QY |
1109 | FOREACH_AFI_SAFI (afi, safi) { |
1110 | /* Reset all negotiated variables */ | |
1111 | peer->afc_nego[afi][safi] = 0; | |
1112 | peer->afc_adv[afi][safi] = 0; | |
1113 | peer->afc_recv[afi][safi] = 0; | |
1114 | ||
1115 | /* peer address family capability flags*/ | |
1116 | peer->af_cap[afi][safi] = 0; | |
1117 | ||
1118 | /* peer address family status flags*/ | |
1119 | peer->af_sflags[afi][safi] = 0; | |
1120 | ||
1121 | /* Received ORF prefix-filter */ | |
1122 | peer->orf_plist[afi][safi] = NULL; | |
1123 | ||
1124 | if ((peer->status == OpenConfirm) | |
1125 | || (peer->status == Established)) { | |
1126 | /* ORF received prefix-filter pnt */ | |
1127 | sprintf(orf_name, "%s.%d.%d", peer->host, afi, safi); | |
1128 | prefix_bgp_orf_remove_all(afi, orf_name); | |
d62a17ae | 1129 | } |
05c7a1cc | 1130 | } |
d62a17ae | 1131 | |
1132 | /* Reset keepalive and holdtime */ | |
d25e4efc | 1133 | if (PEER_OR_GROUP_TIMER_SET(peer)) { |
d62a17ae | 1134 | peer->v_keepalive = peer->keepalive; |
1135 | peer->v_holdtime = peer->holdtime; | |
1136 | } else { | |
1137 | peer->v_keepalive = peer->bgp->default_keepalive; | |
1138 | peer->v_holdtime = peer->bgp->default_holdtime; | |
1ff9a340 | 1139 | } |
d62a17ae | 1140 | |
1141 | peer->update_time = 0; | |
1142 | ||
1143 | /* Until we are sure that there is no problem about prefix count | |
1144 | this should be commented out.*/ | |
718e3744 | 1145 | #if 0 |
1146 | /* Reset prefix count */ | |
1147 | peer->pcount[AFI_IP][SAFI_UNICAST] = 0; | |
1148 | peer->pcount[AFI_IP][SAFI_MULTICAST] = 0; | |
cd1964ff | 1149 | peer->pcount[AFI_IP][SAFI_LABELED_UNICAST] = 0; |
718e3744 | 1150 | peer->pcount[AFI_IP][SAFI_MPLS_VPN] = 0; |
1151 | peer->pcount[AFI_IP6][SAFI_UNICAST] = 0; | |
1152 | peer->pcount[AFI_IP6][SAFI_MULTICAST] = 0; | |
cd1964ff | 1153 | peer->pcount[AFI_IP6][SAFI_LABELED_UNICAST] = 0; |
718e3744 | 1154 | #endif /* 0 */ |
1155 | ||
d62a17ae | 1156 | if (!CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE) |
1157 | && !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
1158 | peer_delete(peer); | |
1159 | ret = -1; | |
1160 | } else { | |
1161 | bgp_peer_conf_if_to_su_update(peer); | |
1162 | } | |
1163 | ||
1164 | return ret; | |
718e3744 | 1165 | } |
1166 | ||
1167 | /* BGP peer is stoped by the error. */ | |
d62a17ae | 1168 | static int bgp_stop_with_error(struct peer *peer) |
718e3744 | 1169 | { |
d62a17ae | 1170 | /* Double start timer. */ |
1171 | peer->v_start *= 2; | |
1172 | ||
1173 | /* Overflow check. */ | |
1174 | if (peer->v_start >= (60 * 2)) | |
1175 | peer->v_start = (60 * 2); | |
1176 | ||
1177 | if (peer_dynamic_neighbor(peer)) { | |
1178 | if (bgp_debug_neighbor_events(peer)) | |
1179 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1180 | peer_delete(peer); | |
1181 | return -1; | |
1182 | } | |
1183 | ||
1184 | return (bgp_stop(peer)); | |
718e3744 | 1185 | } |
1186 | ||
397b5bde LR |
1187 | |
1188 | /* something went wrong, send notify and tear down */ | |
d62a17ae | 1189 | static int bgp_stop_with_notify(struct peer *peer, u_char code, u_char sub_code) |
397b5bde | 1190 | { |
d62a17ae | 1191 | /* Send notify to remote peer */ |
1192 | bgp_notify_send(peer, code, sub_code); | |
1193 | ||
1194 | if (peer_dynamic_neighbor(peer)) { | |
1195 | if (bgp_debug_neighbor_events(peer)) | |
1196 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1197 | peer_delete(peer); | |
1198 | return -1; | |
1199 | } | |
f14e6fdb | 1200 | |
d62a17ae | 1201 | /* Clear start timer value to default. */ |
1202 | peer->v_start = BGP_INIT_START_TIMER; | |
397b5bde | 1203 | |
d62a17ae | 1204 | return (bgp_stop(peer)); |
397b5bde LR |
1205 | } |
1206 | ||
07a16526 QY |
1207 | /** |
1208 | * Determines whether a TCP session has successfully established for a peer and | |
1209 | * events as appropriate. | |
1210 | * | |
1211 | * This function is called when setting up a new session. After connect() is | |
1212 | * called on the peer's socket (in bgp_start()), the fd is passed to select() | |
1213 | * to wait for connection success or failure. When select() returns, this | |
1214 | * function is called to evaluate the result. | |
1215 | */ | |
1216 | static int bgp_connect_check(struct thread *thread) | |
1217 | { | |
1218 | int status; | |
1219 | socklen_t slen; | |
1220 | int ret; | |
1221 | struct peer *peer; | |
1222 | ||
1223 | peer = THREAD_ARG(thread); | |
424ab01d QY |
1224 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); |
1225 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); | |
1226 | assert(!peer->t_read); | |
1227 | assert(!peer->t_write); | |
07a16526 | 1228 | |
424ab01d | 1229 | peer->t_connect_check = NULL; |
dc1188bb | 1230 | |
07a16526 QY |
1231 | /* Check file descriptor. */ |
1232 | slen = sizeof(status); | |
1233 | ret = getsockopt(peer->fd, SOL_SOCKET, SO_ERROR, (void *)&status, | |
1234 | &slen); | |
1235 | ||
1236 | /* If getsockopt is fail, this is fatal error. */ | |
1237 | if (ret < 0) { | |
1238 | zlog_info("can't get sockopt for nonblocking connect"); | |
1239 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
1240 | return -1; | |
1241 | } | |
1242 | ||
1243 | /* When status is 0 then TCP connection is established. */ | |
1244 | if (status == 0) { | |
1245 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
1246 | return 1; | |
1247 | } else { | |
1248 | if (bgp_debug_neighbor_events(peer)) | |
1249 | zlog_debug("%s [Event] Connect failed (%s)", peer->host, | |
1250 | safe_strerror(errno)); | |
1251 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1252 | return 0; | |
1253 | } | |
1254 | } | |
397b5bde | 1255 | |
718e3744 | 1256 | /* TCP connection open. Next we send open message to remote peer. And |
1257 | add read thread for reading open message. */ | |
d62a17ae | 1258 | static int bgp_connect_success(struct peer *peer) |
718e3744 | 1259 | { |
d62a17ae | 1260 | if (peer->fd < 0) { |
1261 | zlog_err("bgp_connect_success peer's fd is negative value %d", | |
1262 | peer->fd); | |
1263 | bgp_stop(peer); | |
1264 | return -1; | |
1265 | } | |
1266 | ||
1267 | if (bgp_getsockname(peer) < 0) { | |
1268 | zlog_err("%s: bgp_getsockname(): failed for peer %s, fd %d", | |
1269 | __FUNCTION__, peer->host, peer->fd); | |
1270 | bgp_notify_send(peer, BGP_NOTIFY_FSM_ERR, | |
1271 | 0); /* internal error */ | |
424ab01d | 1272 | bgp_writes_on(peer); |
d62a17ae | 1273 | return -1; |
1274 | } | |
1275 | ||
424ab01d | 1276 | bgp_reads_on(peer); |
d62a17ae | 1277 | |
1278 | if (bgp_debug_neighbor_events(peer)) { | |
1279 | char buf1[SU_ADDRSTRLEN]; | |
1280 | ||
1281 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) | |
1282 | zlog_debug("%s open active, local address %s", | |
1283 | peer->host, | |
1284 | sockunion2str(peer->su_local, buf1, | |
1285 | SU_ADDRSTRLEN)); | |
1286 | else | |
1287 | zlog_debug("%s passive open", peer->host); | |
1288 | } | |
1289 | ||
1290 | bgp_open_send(peer); | |
1291 | ||
1292 | return 0; | |
718e3744 | 1293 | } |
1294 | ||
1295 | /* TCP connect fail */ | |
d62a17ae | 1296 | static int bgp_connect_fail(struct peer *peer) |
718e3744 | 1297 | { |
d62a17ae | 1298 | if (peer_dynamic_neighbor(peer)) { |
1299 | if (bgp_debug_neighbor_events(peer)) | |
1300 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1301 | peer_delete(peer); | |
1302 | return -1; | |
1303 | } | |
1304 | ||
1305 | return (bgp_stop(peer)); | |
718e3744 | 1306 | } |
1307 | ||
1308 | /* This function is the first starting point of all BGP connection. It | |
1309 | try to connect to remote peer with non-blocking IO. */ | |
d62a17ae | 1310 | int bgp_start(struct peer *peer) |
718e3744 | 1311 | { |
d62a17ae | 1312 | int status; |
1313 | int connected = 0; | |
1314 | ||
1315 | bgp_peer_conf_if_to_su_update(peer); | |
1316 | ||
1317 | if (peer->su.sa.sa_family == AF_UNSPEC) { | |
1318 | if (bgp_debug_neighbor_events(peer)) | |
1319 | zlog_debug( | |
1320 | "%s [FSM] Unable to get neighbor's IP address, waiting...", | |
1321 | peer->host); | |
1322 | return -1; | |
1323 | } | |
1324 | ||
1325 | if (BGP_PEER_START_SUPPRESSED(peer)) { | |
1326 | if (bgp_debug_neighbor_events(peer)) | |
1327 | zlog_err( | |
1328 | "%s [FSM] Trying to start suppressed peer" | |
1329 | " - this is never supposed to happen!", | |
1330 | peer->host); | |
1331 | return -1; | |
1332 | } | |
1333 | ||
1334 | /* Scrub some information that might be left over from a previous, | |
1335 | * session | |
1336 | */ | |
1337 | /* Connection information. */ | |
1338 | if (peer->su_local) { | |
1339 | sockunion_free(peer->su_local); | |
1340 | peer->su_local = NULL; | |
1341 | } | |
1342 | ||
1343 | if (peer->su_remote) { | |
1344 | sockunion_free(peer->su_remote); | |
1345 | peer->su_remote = NULL; | |
1346 | } | |
1347 | ||
1348 | /* Clear remote router-id. */ | |
1349 | peer->remote_id.s_addr = 0; | |
1350 | ||
1351 | /* Clear peer capability flag. */ | |
1352 | peer->cap = 0; | |
1353 | ||
1354 | /* If the peer is passive mode, force to move to Active mode. */ | |
1355 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE)) { | |
1356 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1357 | return 0; | |
1358 | } | |
1359 | ||
1360 | /* Register to be notified on peer up */ | |
1361 | if (peer->sort == BGP_PEER_EBGP && peer->ttl == 1 | |
1362 | && !CHECK_FLAG(peer->flags, PEER_FLAG_DISABLE_CONNECTED_CHECK) | |
1363 | && !bgp_flag_check(peer->bgp, BGP_FLAG_DISABLE_NH_CONNECTED_CHK)) | |
1364 | connected = 1; | |
1365 | else | |
1366 | connected = 0; | |
1367 | ||
1368 | if (!bgp_find_or_add_nexthop(peer->bgp, | |
1369 | family2afi(peer->su.sa.sa_family), NULL, | |
1370 | peer, connected)) { | |
1371 | #if defined(HAVE_CUMULUS) | |
1372 | if (bgp_debug_neighbor_events(peer)) | |
1373 | zlog_debug("%s [FSM] Waiting for NHT", peer->host); | |
1374 | ||
1375 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1376 | return 0; | |
b5826a12 | 1377 | #endif |
718e3744 | 1378 | } |
d62a17ae | 1379 | |
424ab01d QY |
1380 | assert(!peer->t_write); |
1381 | assert(!peer->t_read); | |
1382 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); | |
1383 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); | |
d62a17ae | 1384 | status = bgp_connect(peer); |
1385 | ||
1386 | switch (status) { | |
1387 | case connect_error: | |
1388 | if (bgp_debug_neighbor_events(peer)) | |
1389 | zlog_debug("%s [FSM] Connect error", peer->host); | |
1390 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1391 | break; | |
1392 | case connect_success: | |
1393 | if (bgp_debug_neighbor_events(peer)) | |
1394 | zlog_debug( | |
1395 | "%s [FSM] Connect immediately success, fd %d", | |
1396 | peer->host, peer->fd); | |
1397 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
1398 | break; | |
1399 | case connect_in_progress: | |
1400 | /* To check nonblocking connect, we wait until socket is | |
1401 | readable or writable. */ | |
1402 | if (bgp_debug_neighbor_events(peer)) | |
1403 | zlog_debug( | |
1404 | "%s [FSM] Non blocking connect waiting result, fd %d", | |
1405 | peer->host, peer->fd); | |
1406 | if (peer->fd < 0) { | |
1407 | zlog_err("bgp_start peer's fd is negative value %d", | |
1408 | peer->fd); | |
1409 | return -1; | |
1410 | } | |
becedef6 QY |
1411 | /* |
1412 | * when the socket becomes ready (or fails to connect), | |
1413 | * bgp_connect_check will be called. | |
1414 | */ | |
424ab01d QY |
1415 | thread_add_read(bm->master, bgp_connect_check, peer, peer->fd, |
1416 | &peer->t_connect_check); | |
d62a17ae | 1417 | break; |
1418 | } | |
1419 | return 0; | |
718e3744 | 1420 | } |
1421 | ||
1422 | /* Connect retry timer is expired when the peer status is Connect. */ | |
d62a17ae | 1423 | static int bgp_reconnect(struct peer *peer) |
718e3744 | 1424 | { |
d62a17ae | 1425 | if (bgp_stop(peer) < 0) |
1426 | return -1; | |
1ff9a340 | 1427 | |
d62a17ae | 1428 | bgp_start(peer); |
1429 | return 0; | |
718e3744 | 1430 | } |
1431 | ||
d62a17ae | 1432 | static int bgp_fsm_open(struct peer *peer) |
718e3744 | 1433 | { |
d62a17ae | 1434 | /* Send keepalive and make keepalive timer */ |
1435 | bgp_keepalive_send(peer); | |
718e3744 | 1436 | |
d62a17ae | 1437 | /* Reset holdtimer value. */ |
1438 | BGP_TIMER_OFF(peer->t_holdtime); | |
718e3744 | 1439 | |
d62a17ae | 1440 | return 0; |
718e3744 | 1441 | } |
1442 | ||
397b5bde LR |
1443 | /* FSM error, unexpected event. This is error of BGP connection. So cut the |
1444 | peer and change to Idle status. */ | |
d62a17ae | 1445 | static int bgp_fsm_event_error(struct peer *peer) |
397b5bde | 1446 | { |
d62a17ae | 1447 | zlog_err("%s [FSM] unexpected packet received in state %s", peer->host, |
1448 | lookup_msg(bgp_status_msg, peer->status, NULL)); | |
397b5bde | 1449 | |
d62a17ae | 1450 | return bgp_stop_with_notify(peer, BGP_NOTIFY_FSM_ERR, 0); |
397b5bde LR |
1451 | } |
1452 | ||
718e3744 | 1453 | /* Hold timer expire. This is error of BGP connection. So cut the |
1454 | peer and change to Idle status. */ | |
d62a17ae | 1455 | static int bgp_fsm_holdtime_expire(struct peer *peer) |
718e3744 | 1456 | { |
d62a17ae | 1457 | if (bgp_debug_neighbor_events(peer)) |
1458 | zlog_debug("%s [FSM] Hold timer expire", peer->host); | |
718e3744 | 1459 | |
d62a17ae | 1460 | return bgp_stop_with_notify(peer, BGP_NOTIFY_HOLD_ERR, 0); |
718e3744 | 1461 | } |
1462 | ||
727c4f87 QY |
1463 | /** |
1464 | * Transition to Established state. | |
1465 | * | |
1466 | * Convert peer from stub to full fledged peer, set some timers, and generate | |
1467 | * initial updates. | |
1468 | */ | |
d62a17ae | 1469 | static int bgp_establish(struct peer *peer) |
718e3744 | 1470 | { |
d62a17ae | 1471 | afi_t afi; |
1472 | safi_t safi; | |
1473 | int nsf_af_count = 0; | |
1474 | int ret = 0; | |
1475 | struct peer *other; | |
1476 | ||
1477 | other = peer->doppelganger; | |
1478 | peer = peer_xfer_conn(peer); | |
1479 | if (!peer) { | |
1480 | zlog_err("%%Neighbor failed in xfer_conn"); | |
1481 | return -1; | |
93406d87 | 1482 | } |
93406d87 | 1483 | |
d62a17ae | 1484 | if (other == peer) |
9d303b37 DL |
1485 | ret = |
1486 | 1; /* bgp_establish specific code when xfer_conn | |
1487 | happens. */ | |
d62a17ae | 1488 | |
1489 | /* Reset capability open status flag. */ | |
1490 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN)) | |
1491 | SET_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN); | |
1492 | ||
1493 | /* Clear start timer value to default. */ | |
1494 | peer->v_start = BGP_INIT_START_TIMER; | |
1495 | ||
1496 | /* Increment established count. */ | |
1497 | peer->established++; | |
1498 | bgp_fsm_change_status(peer, Established); | |
1499 | ||
1500 | /* bgp log-neighbor-changes of neighbor Up */ | |
1501 | if (bgp_flag_check(peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { | |
1502 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); | |
1503 | zlog_info("%%ADJCHANGE: neighbor %s(%s) in vrf %s Up", | |
1504 | peer->host, | |
1505 | (peer->hostname) ? peer->hostname : "Unknown", | |
1506 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) ? vrf->name | |
1507 | : "Default") | |
1508 | : ""); | |
1509 | } | |
1510 | /* assign update-group/subgroup */ | |
1511 | update_group_adjust_peer_afs(peer); | |
1512 | ||
1513 | /* graceful restart */ | |
1514 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
1515 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 1516 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) { |
d62a17ae | 1517 | if (peer->afc_nego[afi][safi] |
1518 | && CHECK_FLAG(peer->cap, PEER_CAP_RESTART_ADV) | |
1519 | && CHECK_FLAG(peer->af_cap[afi][safi], | |
1520 | PEER_CAP_RESTART_AF_RCV)) { | |
1521 | if (peer->nsf[afi][safi] | |
1522 | && !CHECK_FLAG( | |
1523 | peer->af_cap[afi][safi], | |
1524 | PEER_CAP_RESTART_AF_PRESERVE_RCV)) | |
1525 | bgp_clear_stale_route(peer, afi, safi); | |
1526 | ||
1527 | peer->nsf[afi][safi] = 1; | |
1528 | nsf_af_count++; | |
1529 | } else { | |
1530 | if (peer->nsf[afi][safi]) | |
1531 | bgp_clear_stale_route(peer, afi, safi); | |
1532 | peer->nsf[afi][safi] = 0; | |
1533 | } | |
1534 | } | |
1535 | ||
1536 | if (nsf_af_count) | |
1537 | SET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1538 | else { | |
1539 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1540 | if (peer->t_gr_stale) { | |
1541 | BGP_TIMER_OFF(peer->t_gr_stale); | |
1542 | if (bgp_debug_neighbor_events(peer)) | |
1543 | zlog_debug( | |
1544 | "%s graceful restart stalepath timer stopped", | |
1545 | peer->host); | |
1546 | } | |
1547 | } | |
93406d87 | 1548 | |
d62a17ae | 1549 | if (peer->t_gr_restart) { |
1550 | BGP_TIMER_OFF(peer->t_gr_restart); | |
1551 | if (bgp_debug_neighbor_events(peer)) | |
1552 | zlog_debug("%s graceful restart timer stopped", | |
1553 | peer->host); | |
1554 | } | |
718e3744 | 1555 | |
d62a17ae | 1556 | hook_call(peer_established, peer); |
1557 | ||
9eb217ff QY |
1558 | /* Reset uptime, turn on keepalives, send current table. */ |
1559 | if (!peer->v_holdtime) | |
1560 | bgp_keepalives_on(peer); | |
1561 | ||
d62a17ae | 1562 | peer->uptime = bgp_clock(); |
1563 | ||
1564 | /* Send route-refresh when ORF is enabled */ | |
05c7a1cc QY |
1565 | FOREACH_AFI_SAFI (afi, safi) { |
1566 | if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1567 | PEER_CAP_ORF_PREFIX_SM_ADV)) { | |
d62a17ae | 1568 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc QY |
1569 | PEER_CAP_ORF_PREFIX_RM_RCV)) |
1570 | bgp_route_refresh_send(peer, afi, safi, | |
1571 | ORF_TYPE_PREFIX, | |
1572 | REFRESH_IMMEDIATE, 0); | |
1573 | else if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1574 | PEER_CAP_ORF_PREFIX_RM_OLD_RCV)) | |
1575 | bgp_route_refresh_send(peer, afi, safi, | |
1576 | ORF_TYPE_PREFIX_OLD, | |
1577 | REFRESH_IMMEDIATE, 0); | |
1578 | } | |
1579 | } | |
d62a17ae | 1580 | |
1581 | /* First update is deferred until ORF or ROUTE-REFRESH is received */ | |
05c7a1cc QY |
1582 | FOREACH_AFI_SAFI (afi, safi) { |
1583 | if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1584 | PEER_CAP_ORF_PREFIX_RM_ADV)) | |
d62a17ae | 1585 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc QY |
1586 | PEER_CAP_ORF_PREFIX_SM_RCV) |
1587 | || CHECK_FLAG(peer->af_cap[afi][safi], | |
1588 | PEER_CAP_ORF_PREFIX_SM_OLD_RCV)) | |
1589 | SET_FLAG(peer->af_sflags[afi][safi], | |
1590 | PEER_STATUS_ORF_WAIT_REFRESH); | |
1591 | } | |
d62a17ae | 1592 | |
1593 | bgp_announce_peer(peer); | |
1594 | ||
1595 | /* Start the route advertisement timer to send updates to the peer - if | |
1596 | * BGP | |
1597 | * is not in read-only mode. If it is, the timer will be started at the | |
1598 | * end | |
1599 | * of read-only mode. | |
1600 | */ | |
1601 | if (!bgp_update_delay_active(peer->bgp)) { | |
1602 | BGP_TIMER_OFF(peer->t_routeadv); | |
1603 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
1604 | } | |
718e3744 | 1605 | |
d62a17ae | 1606 | if (peer->doppelganger && (peer->doppelganger->status != Deleted)) { |
1607 | if (bgp_debug_neighbor_events(peer)) | |
1608 | zlog_debug( | |
1609 | "[Event] Deleting stub connection for peer %s", | |
1610 | peer->host); | |
1611 | ||
1612 | if (peer->doppelganger->status > Active) | |
1613 | bgp_notify_send(peer->doppelganger, BGP_NOTIFY_CEASE, | |
1614 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
1615 | else | |
1616 | peer_delete(peer->doppelganger); | |
718e3744 | 1617 | } |
1618 | ||
d62a17ae | 1619 | bgp_bfd_register_peer(peer); |
1620 | return ret; | |
718e3744 | 1621 | } |
1622 | ||
1623 | /* Keepalive packet is received. */ | |
d62a17ae | 1624 | static int bgp_fsm_keepalive(struct peer *peer) |
718e3744 | 1625 | { |
d62a17ae | 1626 | BGP_TIMER_OFF(peer->t_holdtime); |
1627 | return 0; | |
718e3744 | 1628 | } |
1629 | ||
1630 | /* Update packet is received. */ | |
d62a17ae | 1631 | static int bgp_fsm_update(struct peer *peer) |
718e3744 | 1632 | { |
d62a17ae | 1633 | BGP_TIMER_OFF(peer->t_holdtime); |
1634 | return 0; | |
718e3744 | 1635 | } |
1636 | ||
1637 | /* This is empty event. */ | |
d62a17ae | 1638 | static int bgp_ignore(struct peer *peer) |
718e3744 | 1639 | { |
d62a17ae | 1640 | zlog_err( |
1641 | "%s [FSM] Ignoring event %s in state %s, prior events %s, %s, fd %d", | |
1642 | peer->host, bgp_event_str[peer->cur_event], | |
1643 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1644 | bgp_event_str[peer->last_event], | |
1645 | bgp_event_str[peer->last_major_event], peer->fd); | |
1646 | return 0; | |
718e3744 | 1647 | } |
6b0655a2 | 1648 | |
6403814c | 1649 | /* This is to handle unexpected events.. */ |
d62a17ae | 1650 | static int bgp_fsm_exeption(struct peer *peer) |
6403814c | 1651 | { |
d62a17ae | 1652 | zlog_err( |
1653 | "%s [FSM] Unexpected event %s in state %s, prior events %s, %s, fd %d", | |
1654 | peer->host, bgp_event_str[peer->cur_event], | |
1655 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1656 | bgp_event_str[peer->last_event], | |
1657 | bgp_event_str[peer->last_major_event], peer->fd); | |
1658 | return (bgp_stop(peer)); | |
6403814c DS |
1659 | } |
1660 | ||
d62a17ae | 1661 | void bgp_fsm_nht_update(struct peer *peer, int valid) |
fc9a856f | 1662 | { |
d62a17ae | 1663 | if (!peer) |
1664 | return; | |
1665 | ||
1666 | switch (peer->status) { | |
1667 | case Idle: | |
1668 | if (valid) | |
1669 | BGP_EVENT_ADD(peer, BGP_Start); | |
1670 | break; | |
1671 | case Connect: | |
1672 | if (!valid) { | |
1673 | BGP_TIMER_OFF(peer->t_connect); | |
1674 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
1675 | } | |
1676 | break; | |
1677 | case Active: | |
1678 | if (valid) { | |
1679 | BGP_TIMER_OFF(peer->t_connect); | |
1680 | BGP_EVENT_ADD(peer, ConnectRetry_timer_expired); | |
1681 | } | |
1682 | break; | |
1683 | case OpenSent: | |
1684 | case OpenConfirm: | |
1685 | case Established: | |
1686 | if (!valid && (peer->gtsm_hops == 1)) | |
1687 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
1688 | case Clearing: | |
1689 | case Deleted: | |
1690 | default: | |
1691 | break; | |
fc9a856f | 1692 | } |
fc9a856f DS |
1693 | } |
1694 | ||
1695 | ||
718e3744 | 1696 | /* Finite State Machine structure */ |
fda1d3e0 | 1697 | static const struct { |
d62a17ae | 1698 | int (*func)(struct peer *); |
1699 | int next_state; | |
1700 | } FSM[BGP_STATUS_MAX - 1][BGP_EVENTS_MAX - 1] = { | |
1701 | { | |
1702 | /* Idle state: In Idle state, all events other than BGP_Start is | |
1703 | ignored. With BGP_Start event, finite state machine calls | |
1704 | bgp_start(). */ | |
1705 | {bgp_start, Connect}, /* BGP_Start */ | |
1706 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1707 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1708 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1709 | {bgp_ignore, Idle}, /* TCP_connection_open_failed */ | |
1710 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1711 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ | |
1712 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
1713 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
1714 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
1715 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
1716 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
1717 | {bgp_ignore, Idle}, /* Receive_NOTIFICATION_message */ | |
1718 | {bgp_ignore, Idle}, /* Clearing_Completed */ | |
1719 | }, | |
1720 | { | |
1721 | /* Connect */ | |
1722 | {bgp_ignore, Connect}, /* BGP_Start */ | |
1723 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1724 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1725 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1726 | {bgp_connect_fail, Active}, /* TCP_connection_open_failed */ | |
1727 | {bgp_connect_fail, Idle}, /* TCP_fatal_error */ | |
1728 | {bgp_reconnect, Connect}, /* ConnectRetry_timer_expired */ | |
1729 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ | |
1730 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1731 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1732 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
1733 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1734 | {bgp_stop, Idle}, /* Receive_NOTIFICATION_message */ | |
1735 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1736 | }, | |
1737 | { | |
1738 | /* Active, */ | |
1739 | {bgp_ignore, Active}, /* BGP_Start */ | |
1740 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1741 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1742 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1743 | {bgp_ignore, Active}, /* TCP_connection_open_failed */ | |
1744 | {bgp_fsm_exeption, Idle}, /* TCP_fatal_error */ | |
1745 | {bgp_start, Connect}, /* ConnectRetry_timer_expired */ | |
1746 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ | |
1747 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1748 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1749 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
1750 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1751 | {bgp_fsm_exeption, Idle}, /* Receive_NOTIFICATION_message */ | |
1752 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1753 | }, | |
1754 | { | |
1755 | /* OpenSent, */ | |
1756 | {bgp_ignore, OpenSent}, /* BGP_Start */ | |
1757 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1758 | {bgp_stop, Active}, /* TCP_connection_open */ | |
1759 | {bgp_stop, Active}, /* TCP_connection_closed */ | |
1760 | {bgp_stop, Active}, /* TCP_connection_open_failed */ | |
1761 | {bgp_stop, Active}, /* TCP_fatal_error */ | |
1762 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ | |
1763 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
1764 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1765 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ | |
1766 | {bgp_fsm_event_error, Idle}, /* Receive_KEEPALIVE_message */ | |
1767 | {bgp_fsm_event_error, Idle}, /* Receive_UPDATE_message */ | |
1768 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
1769 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1770 | }, | |
1771 | { | |
1772 | /* OpenConfirm, */ | |
1773 | {bgp_ignore, OpenConfirm}, /* BGP_Start */ | |
1774 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1775 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1776 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1777 | {bgp_stop, Idle}, /* TCP_connection_open_failed */ | |
1778 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1779 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ | |
1780 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
1781 | {bgp_ignore, OpenConfirm}, /* KeepAlive_timer_expired */ | |
1782 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1783 | {bgp_establish, Established}, /* Receive_KEEPALIVE_message */ | |
1784 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1785 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
1786 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1787 | }, | |
1788 | { | |
1789 | /* Established, */ | |
1790 | {bgp_ignore, Established}, /* BGP_Start */ | |
1791 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
1792 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1793 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
1794 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
1795 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
1796 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
1797 | {bgp_fsm_holdtime_expire, Clearing}, /* Hold_Timer_expired */ | |
03014d48 QY |
1798 | {bgp_ignore, Established}, /* KeepAlive_timer_expired */ |
1799 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
d62a17ae | 1800 | {bgp_fsm_keepalive, |
1801 | Established}, /* Receive_KEEPALIVE_message */ | |
1802 | {bgp_fsm_update, Established}, /* Receive_UPDATE_message */ | |
1803 | {bgp_stop_with_error, | |
1804 | Clearing}, /* Receive_NOTIFICATION_message */ | |
1805 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1806 | }, | |
1807 | { | |
1808 | /* Clearing, */ | |
1809 | {bgp_ignore, Clearing}, /* BGP_Start */ | |
1810 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
1811 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1812 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
1813 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
1814 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
1815 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
1816 | {bgp_stop, Clearing}, /* Hold_Timer_expired */ | |
1817 | {bgp_stop, Clearing}, /* KeepAlive_timer_expired */ | |
1818 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
1819 | {bgp_stop, Clearing}, /* Receive_KEEPALIVE_message */ | |
1820 | {bgp_stop, Clearing}, /* Receive_UPDATE_message */ | |
1821 | {bgp_stop, Clearing}, /* Receive_NOTIFICATION_message */ | |
1822 | {bgp_clearing_completed, Idle}, /* Clearing_Completed */ | |
1823 | }, | |
1824 | { | |
1825 | /* Deleted, */ | |
1826 | {bgp_ignore, Deleted}, /* BGP_Start */ | |
1827 | {bgp_ignore, Deleted}, /* BGP_Stop */ | |
1828 | {bgp_ignore, Deleted}, /* TCP_connection_open */ | |
1829 | {bgp_ignore, Deleted}, /* TCP_connection_closed */ | |
1830 | {bgp_ignore, Deleted}, /* TCP_connection_open_failed */ | |
1831 | {bgp_ignore, Deleted}, /* TCP_fatal_error */ | |
1832 | {bgp_ignore, Deleted}, /* ConnectRetry_timer_expired */ | |
1833 | {bgp_ignore, Deleted}, /* Hold_Timer_expired */ | |
1834 | {bgp_ignore, Deleted}, /* KeepAlive_timer_expired */ | |
1835 | {bgp_ignore, Deleted}, /* Receive_OPEN_message */ | |
1836 | {bgp_ignore, Deleted}, /* Receive_KEEPALIVE_message */ | |
1837 | {bgp_ignore, Deleted}, /* Receive_UPDATE_message */ | |
1838 | {bgp_ignore, Deleted}, /* Receive_NOTIFICATION_message */ | |
1839 | {bgp_ignore, Deleted}, /* Clearing_Completed */ | |
1840 | }, | |
718e3744 | 1841 | }; |
1842 | ||
718e3744 | 1843 | /* Execute event process. */ |
d62a17ae | 1844 | int bgp_event(struct thread *thread) |
718e3744 | 1845 | { |
d62a17ae | 1846 | int event; |
1847 | struct peer *peer; | |
1848 | int ret; | |
718e3744 | 1849 | |
d62a17ae | 1850 | peer = THREAD_ARG(thread); |
1851 | event = THREAD_VAL(thread); | |
718e3744 | 1852 | |
d62a17ae | 1853 | ret = bgp_event_update(peer, event); |
1ff9a340 | 1854 | |
d62a17ae | 1855 | return (ret); |
1ff9a340 DS |
1856 | } |
1857 | ||
d62a17ae | 1858 | int bgp_event_update(struct peer *peer, int event) |
1ff9a340 | 1859 | { |
d62a17ae | 1860 | int next; |
1861 | int ret = 0; | |
1862 | struct peer *other; | |
1863 | int passive_conn = 0; | |
1864 | int dyn_nbr; | |
1865 | ||
d8151687 QY |
1866 | /* default return code */ |
1867 | ret = FSM_PEER_NOOP; | |
1868 | ||
d62a17ae | 1869 | other = peer->doppelganger; |
1870 | passive_conn = | |
1871 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) ? 1 : 0; | |
1872 | dyn_nbr = peer_dynamic_neighbor(peer); | |
1873 | ||
1874 | /* Logging this event. */ | |
1875 | next = FSM[peer->status - 1][event - 1].next_state; | |
1876 | ||
1877 | if (bgp_debug_neighbor_events(peer) && peer->status != next) | |
1878 | zlog_debug("%s [FSM] %s (%s->%s), fd %d", peer->host, | |
1879 | bgp_event_str[event], | |
1880 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1881 | lookup_msg(bgp_status_msg, next, NULL), peer->fd); | |
1882 | ||
1883 | peer->last_event = peer->cur_event; | |
1884 | peer->cur_event = event; | |
1885 | ||
1886 | /* Call function. */ | |
1887 | if (FSM[peer->status - 1][event - 1].func) | |
1888 | ret = (*(FSM[peer->status - 1][event - 1].func))(peer); | |
1889 | ||
d62a17ae | 1890 | if (ret >= 0) { |
1891 | if (ret == 1 && next == Established) { | |
1892 | /* The case when doppelganger swap accurred in | |
1893 | bgp_establish. | |
1894 | Update the peer pointer accordingly */ | |
d8151687 | 1895 | ret = FSM_PEER_TRANSFERRED; |
d62a17ae | 1896 | peer = other; |
1897 | } | |
1898 | ||
1899 | /* If status is changed. */ | |
d8151687 | 1900 | if (next != peer->status) { |
d62a17ae | 1901 | bgp_fsm_change_status(peer, next); |
1902 | ||
becedef6 QY |
1903 | /* |
1904 | * If we're going to ESTABLISHED then we executed a | |
1905 | * peer transfer. In this case we can either return | |
1906 | * FSM_PEER_TRANSITIONED or FSM_PEER_TRANSFERRED. | |
1907 | * Opting for TRANSFERRED since transfer implies | |
1908 | * session establishment. | |
1909 | */ | |
d8151687 QY |
1910 | if (ret != FSM_PEER_TRANSFERRED) |
1911 | ret = FSM_PEER_TRANSITIONED; | |
1912 | } | |
1913 | ||
d62a17ae | 1914 | /* Make sure timer is set. */ |
1915 | bgp_timer_set(peer); | |
1916 | ||
bea01226 | 1917 | } else { |
becedef6 QY |
1918 | /* |
1919 | * If we got a return value of -1, that means there was an | |
1920 | * error, restart the FSM. Since bgp_stop() was called on the | |
1921 | * peer. only a few fields are safe to access here. In any case | |
1922 | * we need to indicate that the peer was stopped in the return | |
1923 | * code. | |
1924 | */ | |
bea01226 QY |
1925 | if (!dyn_nbr && !passive_conn && peer->bgp) { |
1926 | zlog_err( | |
1927 | "%s [FSM] Failure handling event %s in state %s, " | |
1928 | "prior events %s, %s, fd %d", | |
1929 | peer->host, bgp_event_str[peer->cur_event], | |
1930 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1931 | bgp_event_str[peer->last_event], | |
1932 | bgp_event_str[peer->last_major_event], | |
1933 | peer->fd); | |
1934 | bgp_stop(peer); | |
1935 | bgp_fsm_change_status(peer, Idle); | |
1936 | bgp_timer_set(peer); | |
1937 | } | |
1938 | ret = FSM_PEER_STOPPED; | |
d62a17ae | 1939 | } |
bea01226 | 1940 | |
d62a17ae | 1941 | return ret; |
718e3744 | 1942 | } |