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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 | 135 | BGP_TIMER_OFF(peer->t_connect); |
387f984e QY |
136 | BGP_TIMER_OFF(peer->t_connect_check_r); |
137 | BGP_TIMER_OFF(peer->t_connect_check_w); | |
d62a17ae | 138 | BGP_TIMER_OFF(from_peer->t_routeadv); |
424ab01d | 139 | BGP_TIMER_OFF(from_peer->t_connect); |
387f984e QY |
140 | BGP_TIMER_OFF(from_peer->t_connect_check_r); |
141 | BGP_TIMER_OFF(from_peer->t_connect_check_w); | |
7a86aa5a | 142 | BGP_TIMER_OFF(from_peer->t_process_packet); |
d3ecc69e | 143 | |
becedef6 QY |
144 | /* |
145 | * At this point in time, it is possible that there are packets pending | |
146 | * on various buffers. Those need to be transferred or dropped, | |
147 | * otherwise we'll get spurious failures during session establishment. | |
148 | */ | |
424ab01d QY |
149 | pthread_mutex_lock(&peer->io_mtx); |
150 | pthread_mutex_lock(&from_peer->io_mtx); | |
d3ecc69e | 151 | { |
424ab01d QY |
152 | fd = peer->fd; |
153 | peer->fd = from_peer->fd; | |
154 | from_peer->fd = fd; | |
155 | ||
156 | stream_fifo_clean(peer->ibuf); | |
d3ecc69e | 157 | stream_fifo_clean(peer->obuf); |
424ab01d | 158 | stream_reset(peer->ibuf_work); |
d3ecc69e | 159 | |
becedef6 QY |
160 | /* |
161 | * this should never happen, since bgp_process_packet() is the | |
162 | * only task that sets and unsets the current packet and it | |
163 | * runs in our pthread. | |
164 | */ | |
424ab01d QY |
165 | if (peer->curr) { |
166 | zlog_err( | |
167 | "[%s] Dropping pending packet on connection transfer:", | |
168 | peer->host); | |
169 | u_int16_t type = stream_getc_from(peer->curr, | |
170 | BGP_MARKER_SIZE + 2); | |
171 | bgp_dump_packet(peer, type, peer->curr); | |
172 | stream_free(peer->curr); | |
173 | peer->curr = NULL; | |
174 | } | |
175 | ||
176 | // copy each packet from old peer's output queue to new peer | |
727c4f87 QY |
177 | while (from_peer->obuf->head) |
178 | stream_fifo_push(peer->obuf, | |
179 | stream_fifo_pop(from_peer->obuf)); | |
424ab01d QY |
180 | |
181 | // copy each packet from old peer's input queue to new peer | |
182 | while (from_peer->ibuf->head) | |
183 | stream_fifo_push(peer->ibuf, | |
184 | stream_fifo_pop(from_peer->ibuf)); | |
7db44ec8 QY |
185 | |
186 | stream_copy(peer->ibuf_work, from_peer->ibuf_work); | |
d3ecc69e | 187 | } |
424ab01d QY |
188 | pthread_mutex_unlock(&from_peer->io_mtx); |
189 | pthread_mutex_unlock(&peer->io_mtx); | |
d62a17ae | 190 | |
191 | peer->as = from_peer->as; | |
192 | peer->v_holdtime = from_peer->v_holdtime; | |
193 | peer->v_keepalive = from_peer->v_keepalive; | |
194 | peer->routeadv = from_peer->routeadv; | |
195 | peer->v_routeadv = from_peer->v_routeadv; | |
196 | peer->v_gr_restart = from_peer->v_gr_restart; | |
197 | peer->cap = from_peer->cap; | |
198 | status = peer->status; | |
199 | pstatus = peer->ostatus; | |
200 | last_evt = peer->last_event; | |
201 | last_maj_evt = peer->last_major_event; | |
202 | peer->status = from_peer->status; | |
203 | peer->ostatus = from_peer->ostatus; | |
204 | peer->last_event = from_peer->last_event; | |
205 | peer->last_major_event = from_peer->last_major_event; | |
206 | from_peer->status = status; | |
207 | from_peer->ostatus = pstatus; | |
208 | from_peer->last_event = last_evt; | |
209 | from_peer->last_major_event = last_maj_evt; | |
210 | peer->remote_id = from_peer->remote_id; | |
211 | ||
212 | if (from_peer->hostname != NULL) { | |
213 | if (peer->hostname) { | |
214 | XFREE(MTYPE_BGP_PEER_HOST, peer->hostname); | |
215 | peer->hostname = NULL; | |
216 | } | |
217 | ||
218 | peer->hostname = from_peer->hostname; | |
219 | from_peer->hostname = NULL; | |
220 | } | |
221 | ||
222 | if (from_peer->domainname != NULL) { | |
223 | if (peer->domainname) { | |
224 | XFREE(MTYPE_BGP_PEER_HOST, peer->domainname); | |
225 | peer->domainname = NULL; | |
226 | } | |
227 | ||
228 | peer->domainname = from_peer->domainname; | |
229 | from_peer->domainname = NULL; | |
230 | } | |
231 | ||
05c7a1cc QY |
232 | FOREACH_AFI_SAFI (afi, safi) { |
233 | peer->af_flags[afi][safi] = from_peer->af_flags[afi][safi]; | |
234 | peer->af_sflags[afi][safi] = from_peer->af_sflags[afi][safi]; | |
235 | peer->af_cap[afi][safi] = from_peer->af_cap[afi][safi]; | |
236 | peer->afc_nego[afi][safi] = from_peer->afc_nego[afi][safi]; | |
237 | peer->afc_adv[afi][safi] = from_peer->afc_adv[afi][safi]; | |
238 | peer->afc_recv[afi][safi] = from_peer->afc_recv[afi][safi]; | |
239 | peer->orf_plist[afi][safi] = from_peer->orf_plist[afi][safi]; | |
240 | } | |
d62a17ae | 241 | |
242 | if (bgp_getsockname(peer) < 0) { | |
243 | zlog_err( | |
244 | "%%bgp_getsockname() failed for %s peer %s fd %d (from_peer fd %d)", | |
245 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER) | |
246 | ? "accept" | |
247 | : ""), | |
248 | peer->host, peer->fd, from_peer->fd); | |
249 | bgp_stop(peer); | |
250 | bgp_stop(from_peer); | |
251 | return NULL; | |
252 | } | |
253 | if (from_peer->status > Active) { | |
254 | if (bgp_getsockname(from_peer) < 0) { | |
255 | zlog_err( | |
256 | "%%bgp_getsockname() failed for %s from_peer %s fd %d (peer fd %d)", | |
257 | (CHECK_FLAG(from_peer->sflags, | |
258 | PEER_STATUS_ACCEPT_PEER) | |
259 | ? "accept" | |
260 | : ""), | |
261 | from_peer->host, from_peer->fd, peer->fd); | |
262 | bgp_stop(from_peer); | |
263 | from_peer = NULL; | |
264 | } | |
265 | } | |
266 | ||
424ab01d QY |
267 | bgp_reads_on(peer); |
268 | bgp_writes_on(peer); | |
7a86aa5a QY |
269 | thread_add_timer_msec(bm->master, bgp_process_packet, peer, 0, |
270 | &peer->t_process_packet); | |
d62a17ae | 271 | |
272 | if (from_peer) | |
273 | peer_xfer_stats(peer, from_peer); | |
274 | ||
275 | return (peer); | |
1ff9a340 DS |
276 | } |
277 | ||
718e3744 | 278 | /* Hook function called after bgp event is occered. And vty's |
279 | neighbor command invoke this function after making neighbor | |
280 | structure. */ | |
d62a17ae | 281 | void bgp_timer_set(struct peer *peer) |
718e3744 | 282 | { |
d62a17ae | 283 | switch (peer->status) { |
284 | case Idle: | |
285 | /* First entry point of peer's finite state machine. In Idle | |
286 | status start timer is on unless peer is shutdown or peer is | |
287 | inactive. All other timer must be turned off */ | |
288 | if (BGP_PEER_START_SUPPRESSED(peer) || !peer_active(peer)) { | |
289 | BGP_TIMER_OFF(peer->t_start); | |
290 | } else { | |
291 | BGP_TIMER_ON(peer->t_start, bgp_start_timer, | |
292 | peer->v_start); | |
293 | } | |
294 | BGP_TIMER_OFF(peer->t_connect); | |
295 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 296 | bgp_keepalives_off(peer); |
d62a17ae | 297 | BGP_TIMER_OFF(peer->t_routeadv); |
298 | break; | |
299 | ||
300 | case Connect: | |
301 | /* After start timer is expired, the peer moves to Connect | |
302 | status. Make sure start timer is off and connect timer is | |
303 | on. */ | |
304 | BGP_TIMER_OFF(peer->t_start); | |
305 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
306 | peer->v_connect); | |
307 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 308 | bgp_keepalives_off(peer); |
d62a17ae | 309 | BGP_TIMER_OFF(peer->t_routeadv); |
310 | break; | |
311 | ||
312 | case Active: | |
313 | /* Active is waiting connection from remote peer. And if | |
314 | connect timer is expired, change status to Connect. */ | |
315 | BGP_TIMER_OFF(peer->t_start); | |
316 | /* If peer is passive mode, do not set connect timer. */ | |
317 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE) | |
318 | || CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
319 | BGP_TIMER_OFF(peer->t_connect); | |
320 | } else { | |
321 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
322 | peer->v_connect); | |
323 | } | |
324 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 325 | bgp_keepalives_off(peer); |
d62a17ae | 326 | BGP_TIMER_OFF(peer->t_routeadv); |
327 | break; | |
328 | ||
329 | case OpenSent: | |
330 | /* OpenSent status. */ | |
331 | BGP_TIMER_OFF(peer->t_start); | |
332 | BGP_TIMER_OFF(peer->t_connect); | |
333 | if (peer->v_holdtime != 0) { | |
334 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
335 | peer->v_holdtime); | |
336 | } else { | |
337 | BGP_TIMER_OFF(peer->t_holdtime); | |
338 | } | |
b72b6f4f | 339 | bgp_keepalives_off(peer); |
d62a17ae | 340 | BGP_TIMER_OFF(peer->t_routeadv); |
341 | break; | |
342 | ||
343 | case OpenConfirm: | |
344 | /* OpenConfirm status. */ | |
345 | BGP_TIMER_OFF(peer->t_start); | |
346 | BGP_TIMER_OFF(peer->t_connect); | |
347 | ||
348 | /* If the negotiated Hold Time value is zero, then the Hold Time | |
349 | timer and KeepAlive timers are not started. */ | |
350 | if (peer->v_holdtime == 0) { | |
351 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 352 | bgp_keepalives_off(peer); |
d62a17ae | 353 | } else { |
354 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
355 | peer->v_holdtime); | |
b72b6f4f | 356 | bgp_keepalives_on(peer); |
d62a17ae | 357 | } |
358 | BGP_TIMER_OFF(peer->t_routeadv); | |
359 | break; | |
360 | ||
361 | case Established: | |
362 | /* In Established status start and connect timer is turned | |
363 | off. */ | |
364 | BGP_TIMER_OFF(peer->t_start); | |
365 | BGP_TIMER_OFF(peer->t_connect); | |
366 | ||
367 | /* Same as OpenConfirm, if holdtime is zero then both holdtime | |
368 | and keepalive must be turned off. */ | |
369 | if (peer->v_holdtime == 0) { | |
370 | BGP_TIMER_OFF(peer->t_holdtime); | |
bea01226 | 371 | bgp_keepalives_off(peer); |
d62a17ae | 372 | } else { |
373 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
374 | peer->v_holdtime); | |
bea01226 | 375 | bgp_keepalives_on(peer); |
d62a17ae | 376 | } |
377 | break; | |
378 | case Deleted: | |
379 | BGP_TIMER_OFF(peer->t_gr_restart); | |
380 | BGP_TIMER_OFF(peer->t_gr_stale); | |
381 | BGP_TIMER_OFF(peer->t_pmax_restart); | |
382 | /* fallthru */ | |
383 | case Clearing: | |
384 | BGP_TIMER_OFF(peer->t_start); | |
385 | BGP_TIMER_OFF(peer->t_connect); | |
386 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 387 | bgp_keepalives_off(peer); |
d62a17ae | 388 | BGP_TIMER_OFF(peer->t_routeadv); |
389 | break; | |
718e3744 | 390 | } |
718e3744 | 391 | } |
392 | ||
393 | /* BGP start timer. This function set BGP_Start event to thread value | |
394 | and process event. */ | |
d62a17ae | 395 | static int bgp_start_timer(struct thread *thread) |
718e3744 | 396 | { |
d62a17ae | 397 | struct peer *peer; |
718e3744 | 398 | |
d62a17ae | 399 | peer = THREAD_ARG(thread); |
400 | peer->t_start = NULL; | |
718e3744 | 401 | |
d62a17ae | 402 | if (bgp_debug_neighbor_events(peer)) |
403 | zlog_debug("%s [FSM] Timer (start timer expire).", peer->host); | |
718e3744 | 404 | |
d62a17ae | 405 | THREAD_VAL(thread) = BGP_Start; |
406 | bgp_event(thread); /* bgp_event unlocks peer */ | |
718e3744 | 407 | |
d62a17ae | 408 | return 0; |
718e3744 | 409 | } |
410 | ||
411 | /* BGP connect retry timer. */ | |
d62a17ae | 412 | static int bgp_connect_timer(struct thread *thread) |
718e3744 | 413 | { |
d62a17ae | 414 | struct peer *peer; |
415 | int ret; | |
416 | ||
417 | peer = THREAD_ARG(thread); | |
424ab01d QY |
418 | |
419 | assert(!peer->t_write); | |
420 | assert(!peer->t_read); | |
421 | ||
d62a17ae | 422 | peer->t_connect = NULL; |
423 | ||
424 | if (bgp_debug_neighbor_events(peer)) | |
425 | zlog_debug("%s [FSM] Timer (connect timer expire)", peer->host); | |
426 | ||
427 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) { | |
428 | bgp_stop(peer); | |
429 | ret = -1; | |
430 | } else { | |
431 | THREAD_VAL(thread) = ConnectRetry_timer_expired; | |
432 | bgp_event(thread); /* bgp_event unlocks peer */ | |
433 | ret = 0; | |
434 | } | |
435 | ||
436 | return ret; | |
718e3744 | 437 | } |
438 | ||
439 | /* BGP holdtime timer. */ | |
d62a17ae | 440 | static int bgp_holdtime_timer(struct thread *thread) |
718e3744 | 441 | { |
d62a17ae | 442 | struct peer *peer; |
718e3744 | 443 | |
d62a17ae | 444 | peer = THREAD_ARG(thread); |
445 | peer->t_holdtime = NULL; | |
718e3744 | 446 | |
d62a17ae | 447 | if (bgp_debug_neighbor_events(peer)) |
448 | zlog_debug("%s [FSM] Timer (holdtime timer expire)", | |
449 | peer->host); | |
718e3744 | 450 | |
d62a17ae | 451 | THREAD_VAL(thread) = Hold_Timer_expired; |
452 | bgp_event(thread); /* bgp_event unlocks peer */ | |
718e3744 | 453 | |
d62a17ae | 454 | return 0; |
718e3744 | 455 | } |
456 | ||
d62a17ae | 457 | int bgp_routeadv_timer(struct thread *thread) |
718e3744 | 458 | { |
d62a17ae | 459 | struct peer *peer; |
718e3744 | 460 | |
d62a17ae | 461 | peer = THREAD_ARG(thread); |
462 | peer->t_routeadv = NULL; | |
718e3744 | 463 | |
d62a17ae | 464 | if (bgp_debug_neighbor_events(peer)) |
465 | zlog_debug("%s [FSM] Timer (routeadv timer expire)", | |
466 | peer->host); | |
718e3744 | 467 | |
d62a17ae | 468 | peer->synctime = bgp_clock(); |
718e3744 | 469 | |
a9794991 | 470 | thread_add_timer_msec(bm->master, bgp_generate_updgrp_packets, peer, 0, |
424ab01d QY |
471 | &peer->t_generate_updgrp_packets); |
472 | ||
d62a17ae | 473 | /* MRAI timer will be started again when FIFO is built, no need to |
474 | * do it here. | |
475 | */ | |
476 | return 0; | |
718e3744 | 477 | } |
478 | ||
e0701b79 | 479 | /* BGP Peer Down Cause */ |
d62a17ae | 480 | const char *peer_down_str[] = {"", |
481 | "Router ID changed", | |
482 | "Remote AS changed", | |
483 | "Local AS change", | |
484 | "Cluster ID changed", | |
485 | "Confederation identifier changed", | |
486 | "Confederation peer changed", | |
487 | "RR client config change", | |
488 | "RS client config change", | |
489 | "Update source change", | |
490 | "Address family activated", | |
491 | "Admin. shutdown", | |
492 | "User reset", | |
493 | "BGP Notification received", | |
494 | "BGP Notification send", | |
495 | "Peer closed the session", | |
496 | "Neighbor deleted", | |
497 | "Peer-group add member", | |
498 | "Peer-group delete member", | |
499 | "Capability changed", | |
500 | "Passive config change", | |
501 | "Multihop config change", | |
502 | "NSF peer closed the session", | |
503 | "Intf peering v6only config change", | |
504 | "BFD down received", | |
505 | "Interface down", | |
506 | "Neighbor address lost"}; | |
507 | ||
508 | static int bgp_graceful_restart_timer_expire(struct thread *thread) | |
e0701b79 | 509 | { |
d62a17ae | 510 | struct peer *peer; |
511 | afi_t afi; | |
512 | safi_t safi; | |
513 | ||
514 | peer = THREAD_ARG(thread); | |
515 | peer->t_gr_restart = NULL; | |
516 | ||
517 | /* NSF delete stale route */ | |
518 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 519 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) |
d62a17ae | 520 | if (peer->nsf[afi][safi]) |
521 | bgp_clear_stale_route(peer, afi, safi); | |
522 | ||
523 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
524 | BGP_TIMER_OFF(peer->t_gr_stale); | |
525 | ||
526 | if (bgp_debug_neighbor_events(peer)) { | |
527 | zlog_debug("%s graceful restart timer expired", peer->host); | |
528 | zlog_debug("%s graceful restart stalepath timer stopped", | |
529 | peer->host); | |
530 | } | |
93406d87 | 531 | |
d62a17ae | 532 | bgp_timer_set(peer); |
93406d87 | 533 | |
d62a17ae | 534 | return 0; |
93406d87 | 535 | } |
536 | ||
d62a17ae | 537 | static int bgp_graceful_stale_timer_expire(struct thread *thread) |
93406d87 | 538 | { |
d62a17ae | 539 | struct peer *peer; |
540 | afi_t afi; | |
541 | safi_t safi; | |
93406d87 | 542 | |
d62a17ae | 543 | peer = THREAD_ARG(thread); |
544 | peer->t_gr_stale = NULL; | |
93406d87 | 545 | |
d62a17ae | 546 | if (bgp_debug_neighbor_events(peer)) |
547 | zlog_debug("%s graceful restart stalepath timer expired", | |
548 | peer->host); | |
93406d87 | 549 | |
d62a17ae | 550 | /* NSF delete stale route */ |
551 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 552 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) |
d62a17ae | 553 | if (peer->nsf[afi][safi]) |
554 | bgp_clear_stale_route(peer, afi, safi); | |
93406d87 | 555 | |
d62a17ae | 556 | return 0; |
93406d87 | 557 | } |
558 | ||
d62a17ae | 559 | static int bgp_update_delay_applicable(struct bgp *bgp) |
f188f2c4 | 560 | { |
d62a17ae | 561 | /* update_delay_over flag should be reset (set to 0) for any new |
562 | applicability of the update-delay during BGP process lifetime. | |
563 | And it should be set after an occurence of the update-delay is | |
564 | over)*/ | |
565 | if (!bgp->update_delay_over) | |
566 | return 1; | |
567 | ||
568 | return 0; | |
f188f2c4 DS |
569 | } |
570 | ||
d62a17ae | 571 | int bgp_update_delay_active(struct bgp *bgp) |
f188f2c4 | 572 | { |
d62a17ae | 573 | if (bgp->t_update_delay) |
574 | return 1; | |
f188f2c4 | 575 | |
d62a17ae | 576 | return 0; |
f188f2c4 DS |
577 | } |
578 | ||
d62a17ae | 579 | int bgp_update_delay_configured(struct bgp *bgp) |
f188f2c4 | 580 | { |
d62a17ae | 581 | if (bgp->v_update_delay) |
582 | return 1; | |
f188f2c4 | 583 | |
d62a17ae | 584 | return 0; |
f188f2c4 DS |
585 | } |
586 | ||
587 | /* Do the post-processing needed when bgp comes out of the read-only mode | |
588 | on ending the update delay. */ | |
d62a17ae | 589 | void bgp_update_delay_end(struct bgp *bgp) |
f188f2c4 | 590 | { |
d62a17ae | 591 | THREAD_TIMER_OFF(bgp->t_update_delay); |
592 | THREAD_TIMER_OFF(bgp->t_establish_wait); | |
593 | ||
594 | /* Reset update-delay related state */ | |
595 | bgp->update_delay_over = 1; | |
596 | bgp->established = 0; | |
597 | bgp->restarted_peers = 0; | |
598 | bgp->implicit_eors = 0; | |
599 | bgp->explicit_eors = 0; | |
600 | ||
601 | quagga_timestamp(3, bgp->update_delay_end_time, | |
602 | sizeof(bgp->update_delay_end_time)); | |
603 | ||
604 | /* | |
605 | * Add an end-of-initial-update marker to the main process queues so | |
606 | * that | |
607 | * the route advertisement timer for the peers can be started. Also set | |
608 | * the zebra and peer update hold flags. These flags are used to achieve | |
609 | * three stages in the update-delay post processing: | |
610 | * 1. Finish best-path selection for all the prefixes held on the | |
611 | * queues. | |
612 | * (routes in BGP are updated, and peers sync queues are populated | |
613 | * too) | |
614 | * 2. As the eoiu mark is reached in the bgp process routine, ship all | |
615 | * the | |
616 | * routes to zebra. With that zebra should see updates from BGP | |
617 | * close | |
618 | * to each other. | |
619 | * 3. Unblock the peer update writes. With that peer update packing | |
620 | * with | |
621 | * the prefixes should be at its maximum. | |
622 | */ | |
623 | bgp_add_eoiu_mark(bgp); | |
624 | bgp->main_zebra_update_hold = 1; | |
625 | bgp->main_peers_update_hold = 1; | |
626 | ||
627 | /* Resume the queue processing. This should trigger the event that would | |
628 | take | |
629 | care of processing any work that was queued during the read-only | |
630 | mode. */ | |
631 | work_queue_unplug(bm->process_main_queue); | |
f188f2c4 DS |
632 | } |
633 | ||
cb1faec9 DS |
634 | /** |
635 | * see bgp_fsm.h | |
636 | */ | |
d62a17ae | 637 | void bgp_start_routeadv(struct bgp *bgp) |
cb1faec9 | 638 | { |
d62a17ae | 639 | struct listnode *node, *nnode; |
640 | struct peer *peer; | |
cb1faec9 | 641 | |
d62a17ae | 642 | zlog_info("bgp_start_routeadv(), update hold status %d", |
643 | bgp->main_peers_update_hold); | |
4a16ae86 | 644 | |
d62a17ae | 645 | if (bgp->main_peers_update_hold) |
646 | return; | |
4a16ae86 | 647 | |
d62a17ae | 648 | quagga_timestamp(3, bgp->update_delay_peers_resume_time, |
649 | sizeof(bgp->update_delay_peers_resume_time)); | |
4a16ae86 | 650 | |
d62a17ae | 651 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) { |
652 | if (peer->status != Established) | |
653 | continue; | |
654 | BGP_TIMER_OFF(peer->t_routeadv); | |
655 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
656 | } | |
cb1faec9 DS |
657 | } |
658 | ||
659 | /** | |
660 | * see bgp_fsm.h | |
661 | */ | |
d62a17ae | 662 | void bgp_adjust_routeadv(struct peer *peer) |
cb1faec9 | 663 | { |
d62a17ae | 664 | time_t nowtime = bgp_clock(); |
665 | double diff; | |
666 | unsigned long remain; | |
667 | ||
668 | /* Bypass checks for special case of MRAI being 0 */ | |
669 | if (peer->v_routeadv == 0) { | |
670 | /* Stop existing timer, just in case it is running for a | |
671 | * different | |
672 | * duration and schedule write thread immediately. | |
673 | */ | |
674 | if (peer->t_routeadv) | |
675 | BGP_TIMER_OFF(peer->t_routeadv); | |
676 | ||
677 | peer->synctime = bgp_clock(); | |
a9794991 | 678 | thread_add_timer_msec(bm->master, bgp_generate_updgrp_packets, |
424ab01d QY |
679 | peer, 0, |
680 | &peer->t_generate_updgrp_packets); | |
d62a17ae | 681 | return; |
682 | } | |
683 | ||
684 | ||
685 | /* | |
686 | * CASE I: | |
687 | * If the last update was written more than MRAI back, expire the timer | |
688 | * instantly so that we can send the update out sooner. | |
689 | * | |
690 | * <------- MRAI ---------> | |
691 | * |-----------------|-----------------------| | |
692 | * <------------- m ------------> | |
693 | * ^ ^ ^ | |
694 | * | | | | |
695 | * | | current time | |
696 | * | timer start | |
697 | * last write | |
698 | * | |
699 | * m > MRAI | |
700 | */ | |
701 | diff = difftime(nowtime, peer->last_update); | |
702 | if (diff > (double)peer->v_routeadv) { | |
703 | BGP_TIMER_OFF(peer->t_routeadv); | |
704 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
705 | return; | |
706 | } | |
707 | ||
708 | /* | |
709 | * CASE II: | |
710 | * - Find when to expire the MRAI timer. | |
711 | * If MRAI timer is not active, assume we can start it now. | |
712 | * | |
713 | * <------- MRAI ---------> | |
714 | * |------------|-----------------------| | |
715 | * <-------- m ----------><----- r -----> | |
716 | * ^ ^ ^ | |
717 | * | | | | |
718 | * | | current time | |
719 | * | timer start | |
720 | * last write | |
721 | * | |
722 | * (MRAI - m) < r | |
723 | */ | |
724 | if (peer->t_routeadv) | |
725 | remain = thread_timer_remain_second(peer->t_routeadv); | |
726 | else | |
727 | remain = peer->v_routeadv; | |
728 | diff = peer->v_routeadv - diff; | |
729 | if (diff <= (double)remain) { | |
730 | BGP_TIMER_OFF(peer->t_routeadv); | |
731 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, diff); | |
732 | } | |
cb1faec9 DS |
733 | } |
734 | ||
d62a17ae | 735 | static int bgp_maxmed_onstartup_applicable(struct bgp *bgp) |
abc920f8 | 736 | { |
d62a17ae | 737 | if (!bgp->maxmed_onstartup_over) |
738 | return 1; | |
abc920f8 | 739 | |
d62a17ae | 740 | return 0; |
abc920f8 DS |
741 | } |
742 | ||
d62a17ae | 743 | int bgp_maxmed_onstartup_configured(struct bgp *bgp) |
abc920f8 | 744 | { |
d62a17ae | 745 | if (bgp->v_maxmed_onstartup != BGP_MAXMED_ONSTARTUP_UNCONFIGURED) |
746 | return 1; | |
abc920f8 | 747 | |
d62a17ae | 748 | return 0; |
abc920f8 DS |
749 | } |
750 | ||
d62a17ae | 751 | int bgp_maxmed_onstartup_active(struct bgp *bgp) |
abc920f8 | 752 | { |
d62a17ae | 753 | if (bgp->t_maxmed_onstartup) |
754 | return 1; | |
abc920f8 | 755 | |
d62a17ae | 756 | return 0; |
abc920f8 DS |
757 | } |
758 | ||
d62a17ae | 759 | void bgp_maxmed_update(struct bgp *bgp) |
abc920f8 | 760 | { |
d62a17ae | 761 | u_char maxmed_active; |
762 | u_int32_t maxmed_value; | |
763 | ||
764 | if (bgp->v_maxmed_admin) { | |
765 | maxmed_active = 1; | |
766 | maxmed_value = bgp->maxmed_admin_value; | |
767 | } else if (bgp->t_maxmed_onstartup) { | |
768 | maxmed_active = 1; | |
769 | maxmed_value = bgp->maxmed_onstartup_value; | |
770 | } else { | |
771 | maxmed_active = 0; | |
772 | maxmed_value = BGP_MAXMED_VALUE_DEFAULT; | |
773 | } | |
774 | ||
775 | if (bgp->maxmed_active != maxmed_active | |
776 | || bgp->maxmed_value != maxmed_value) { | |
777 | bgp->maxmed_active = maxmed_active; | |
778 | bgp->maxmed_value = maxmed_value; | |
779 | ||
780 | update_group_announce(bgp); | |
781 | } | |
abc920f8 DS |
782 | } |
783 | ||
784 | /* The maxmed onstartup timer expiry callback. */ | |
d62a17ae | 785 | static int bgp_maxmed_onstartup_timer(struct thread *thread) |
abc920f8 | 786 | { |
d62a17ae | 787 | struct bgp *bgp; |
abc920f8 | 788 | |
d62a17ae | 789 | zlog_info("Max med on startup ended - timer expired."); |
abc920f8 | 790 | |
d62a17ae | 791 | bgp = THREAD_ARG(thread); |
792 | THREAD_TIMER_OFF(bgp->t_maxmed_onstartup); | |
793 | bgp->maxmed_onstartup_over = 1; | |
abc920f8 | 794 | |
d62a17ae | 795 | bgp_maxmed_update(bgp); |
abc920f8 | 796 | |
d62a17ae | 797 | return 0; |
abc920f8 DS |
798 | } |
799 | ||
d62a17ae | 800 | static void bgp_maxmed_onstartup_begin(struct bgp *bgp) |
abc920f8 | 801 | { |
d62a17ae | 802 | /* Applicable only once in the process lifetime on the startup */ |
803 | if (bgp->maxmed_onstartup_over) | |
804 | return; | |
abc920f8 | 805 | |
d62a17ae | 806 | zlog_info("Begin maxmed onstartup mode - timer %d seconds", |
807 | bgp->v_maxmed_onstartup); | |
abc920f8 | 808 | |
d62a17ae | 809 | thread_add_timer(bm->master, bgp_maxmed_onstartup_timer, bgp, |
810 | bgp->v_maxmed_onstartup, &bgp->t_maxmed_onstartup); | |
abc920f8 | 811 | |
d62a17ae | 812 | if (!bgp->v_maxmed_admin) { |
813 | bgp->maxmed_active = 1; | |
814 | bgp->maxmed_value = bgp->maxmed_onstartup_value; | |
815 | } | |
abc920f8 | 816 | |
d62a17ae | 817 | /* Route announce to all peers should happen after this in |
818 | * bgp_establish() */ | |
abc920f8 DS |
819 | } |
820 | ||
d62a17ae | 821 | static void bgp_maxmed_onstartup_process_status_change(struct peer *peer) |
abc920f8 | 822 | { |
d62a17ae | 823 | if (peer->status == Established && !peer->bgp->established) { |
824 | bgp_maxmed_onstartup_begin(peer->bgp); | |
825 | } | |
abc920f8 DS |
826 | } |
827 | ||
f188f2c4 | 828 | /* The update delay timer expiry callback. */ |
d62a17ae | 829 | static int bgp_update_delay_timer(struct thread *thread) |
f188f2c4 | 830 | { |
d62a17ae | 831 | struct bgp *bgp; |
f188f2c4 | 832 | |
d62a17ae | 833 | zlog_info("Update delay ended - timer expired."); |
f188f2c4 | 834 | |
d62a17ae | 835 | bgp = THREAD_ARG(thread); |
836 | THREAD_TIMER_OFF(bgp->t_update_delay); | |
837 | bgp_update_delay_end(bgp); | |
f188f2c4 | 838 | |
d62a17ae | 839 | return 0; |
f188f2c4 DS |
840 | } |
841 | ||
842 | /* The establish wait timer expiry callback. */ | |
d62a17ae | 843 | static int bgp_establish_wait_timer(struct thread *thread) |
f188f2c4 | 844 | { |
d62a17ae | 845 | struct bgp *bgp; |
f188f2c4 | 846 | |
d62a17ae | 847 | zlog_info("Establish wait - timer expired."); |
f188f2c4 | 848 | |
d62a17ae | 849 | bgp = THREAD_ARG(thread); |
850 | THREAD_TIMER_OFF(bgp->t_establish_wait); | |
851 | bgp_check_update_delay(bgp); | |
f188f2c4 | 852 | |
d62a17ae | 853 | return 0; |
f188f2c4 DS |
854 | } |
855 | ||
856 | /* Steps to begin the update delay: | |
857 | - initialize queues if needed | |
858 | - stop the queue processing | |
859 | - start the timer */ | |
d62a17ae | 860 | static void bgp_update_delay_begin(struct bgp *bgp) |
f188f2c4 | 861 | { |
d62a17ae | 862 | struct listnode *node, *nnode; |
863 | struct peer *peer; | |
f188f2c4 | 864 | |
d62a17ae | 865 | /* Stop the processing of queued work. Enqueue shall continue */ |
866 | work_queue_plug(bm->process_main_queue); | |
f188f2c4 | 867 | |
d62a17ae | 868 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) |
869 | peer->update_delay_over = 0; | |
f188f2c4 | 870 | |
d62a17ae | 871 | /* Start the update-delay timer */ |
872 | thread_add_timer(bm->master, bgp_update_delay_timer, bgp, | |
873 | bgp->v_update_delay, &bgp->t_update_delay); | |
f188f2c4 | 874 | |
d62a17ae | 875 | if (bgp->v_establish_wait != bgp->v_update_delay) |
876 | thread_add_timer(bm->master, bgp_establish_wait_timer, bgp, | |
877 | bgp->v_establish_wait, &bgp->t_establish_wait); | |
f188f2c4 | 878 | |
d62a17ae | 879 | quagga_timestamp(3, bgp->update_delay_begin_time, |
880 | sizeof(bgp->update_delay_begin_time)); | |
f188f2c4 DS |
881 | } |
882 | ||
d62a17ae | 883 | static void bgp_update_delay_process_status_change(struct peer *peer) |
f188f2c4 | 884 | { |
d62a17ae | 885 | if (peer->status == Established) { |
886 | if (!peer->bgp->established++) { | |
887 | bgp_update_delay_begin(peer->bgp); | |
888 | zlog_info( | |
889 | "Begin read-only mode - update-delay timer %d seconds", | |
890 | peer->bgp->v_update_delay); | |
891 | } | |
892 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_BIT_RCV)) | |
893 | bgp_update_restarted_peers(peer); | |
894 | } | |
895 | if (peer->ostatus == Established | |
896 | && bgp_update_delay_active(peer->bgp)) { | |
897 | /* Adjust the update-delay state to account for this flap. | |
898 | NOTE: Intentionally skipping adjusting implicit_eors or | |
899 | explicit_eors | |
900 | counters. Extra sanity check in bgp_check_update_delay() | |
901 | should | |
902 | be enough to take care of any additive discrepancy in bgp eor | |
903 | counters */ | |
904 | peer->bgp->established--; | |
905 | peer->update_delay_over = 0; | |
906 | } | |
f188f2c4 DS |
907 | } |
908 | ||
200df115 | 909 | /* Called after event occured, this function change status and reset |
910 | read/write and timer thread. */ | |
d62a17ae | 911 | void bgp_fsm_change_status(struct peer *peer, int status) |
200df115 | 912 | { |
1ff9a340 | 913 | |
d62a17ae | 914 | bgp_dump_state(peer, peer->status, status); |
915 | ||
916 | /* Transition into Clearing or Deleted must /always/ clear all routes.. | |
917 | * (and must do so before actually changing into Deleted.. | |
918 | */ | |
919 | if (status >= Clearing) { | |
920 | bgp_clear_route_all(peer); | |
921 | ||
922 | /* If no route was queued for the clear-node processing, | |
923 | * generate the | |
924 | * completion event here. This is needed because if there are no | |
925 | * routes | |
926 | * to trigger the background clear-node thread, the event won't | |
927 | * get | |
928 | * generated and the peer would be stuck in Clearing. Note that | |
929 | * this | |
930 | * event is for the peer and helps the peer transition out of | |
931 | * Clearing | |
932 | * state; it should not be generated per (AFI,SAFI). The event | |
933 | * is | |
934 | * directly posted here without calling clear_node_complete() as | |
935 | * we | |
936 | * shouldn't do an extra unlock. This event will get processed | |
937 | * after | |
938 | * the state change that happens below, so peer will be in | |
939 | * Clearing | |
940 | * (or Deleted). | |
941 | */ | |
942 | if (!work_queue_is_scheduled(peer->clear_node_queue)) | |
943 | BGP_EVENT_ADD(peer, Clearing_Completed); | |
944 | } | |
945 | ||
946 | /* Preserve old status and change into new status. */ | |
947 | peer->ostatus = peer->status; | |
948 | peer->status = status; | |
949 | ||
950 | /* Save event that caused status change. */ | |
951 | peer->last_major_event = peer->cur_event; | |
952 | ||
953 | if (status == Established) | |
954 | UNSET_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER); | |
955 | ||
956 | /* If max-med processing is applicable, do the necessary. */ | |
957 | if (status == Established) { | |
958 | if (bgp_maxmed_onstartup_configured(peer->bgp) | |
959 | && bgp_maxmed_onstartup_applicable(peer->bgp)) | |
960 | bgp_maxmed_onstartup_process_status_change(peer); | |
961 | else | |
962 | peer->bgp->maxmed_onstartup_over = 1; | |
963 | } | |
964 | ||
965 | /* If update-delay processing is applicable, do the necessary. */ | |
966 | if (bgp_update_delay_configured(peer->bgp) | |
967 | && bgp_update_delay_applicable(peer->bgp)) | |
968 | bgp_update_delay_process_status_change(peer); | |
969 | ||
970 | if (bgp_debug_neighbor_events(peer)) | |
971 | zlog_debug("%s went from %s to %s", peer->host, | |
972 | lookup_msg(bgp_status_msg, peer->ostatus, NULL), | |
973 | lookup_msg(bgp_status_msg, peer->status, NULL)); | |
200df115 | 974 | } |
975 | ||
3117b5c4 | 976 | /* Flush the event queue and ensure the peer is shut down */ |
d62a17ae | 977 | static int bgp_clearing_completed(struct peer *peer) |
3117b5c4 | 978 | { |
d62a17ae | 979 | int rc = bgp_stop(peer); |
1ff9a340 | 980 | |
d62a17ae | 981 | if (rc >= 0) |
982 | BGP_EVENT_FLUSH(peer); | |
3117b5c4 | 983 | |
d62a17ae | 984 | return rc; |
3117b5c4 SH |
985 | } |
986 | ||
718e3744 | 987 | /* Administrative BGP peer stop event. */ |
3117b5c4 | 988 | /* May be called multiple times for the same peer */ |
d62a17ae | 989 | int bgp_stop(struct peer *peer) |
718e3744 | 990 | { |
d62a17ae | 991 | afi_t afi; |
992 | safi_t safi; | |
993 | char orf_name[BUFSIZ]; | |
994 | int ret = 0; | |
995 | ||
996 | if (peer_dynamic_neighbor(peer) | |
997 | && !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
998 | if (bgp_debug_neighbor_events(peer)) | |
999 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1000 | peer_delete(peer); | |
1001 | return -1; | |
c22767d8 | 1002 | } |
848973c7 | 1003 | |
d62a17ae | 1004 | /* Can't do this in Clearing; events are used for state transitions */ |
1005 | if (peer->status != Clearing) { | |
1006 | /* Delete all existing events of the peer */ | |
1007 | BGP_EVENT_FLUSH(peer); | |
93406d87 | 1008 | } |
d62a17ae | 1009 | |
1010 | /* Increment Dropped count. */ | |
1011 | if (peer->status == Established) { | |
1012 | peer->dropped++; | |
1013 | ||
1014 | /* bgp log-neighbor-changes of neighbor Down */ | |
1015 | if (bgp_flag_check(peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { | |
1016 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); | |
1017 | zlog_info( | |
1018 | "%%ADJCHANGE: neighbor %s(%s) in vrf %s Down %s", | |
1019 | peer->host, | |
1020 | (peer->hostname) ? peer->hostname : "Unknown", | |
1021 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) ? vrf->name | |
1022 | : "Default") | |
1023 | : "", | |
1024 | peer_down_str[(int)peer->last_reset]); | |
1025 | } | |
1026 | ||
1027 | /* graceful restart */ | |
1028 | if (peer->t_gr_stale) { | |
1029 | BGP_TIMER_OFF(peer->t_gr_stale); | |
1030 | if (bgp_debug_neighbor_events(peer)) | |
1031 | zlog_debug( | |
1032 | "%s graceful restart stalepath timer stopped", | |
1033 | peer->host); | |
1034 | } | |
1035 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
1036 | if (bgp_debug_neighbor_events(peer)) { | |
1037 | zlog_debug( | |
1038 | "%s graceful restart timer started for %d sec", | |
1039 | peer->host, peer->v_gr_restart); | |
1040 | zlog_debug( | |
1041 | "%s graceful restart stalepath timer started for %d sec", | |
1042 | peer->host, peer->bgp->stalepath_time); | |
1043 | } | |
1044 | BGP_TIMER_ON(peer->t_gr_restart, | |
1045 | bgp_graceful_restart_timer_expire, | |
1046 | peer->v_gr_restart); | |
1047 | BGP_TIMER_ON(peer->t_gr_stale, | |
1048 | bgp_graceful_stale_timer_expire, | |
1049 | peer->bgp->stalepath_time); | |
1050 | } else { | |
1051 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1052 | ||
1053 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
1054 | for (safi = SAFI_UNICAST; | |
a08ca0a7 | 1055 | safi <= SAFI_MPLS_VPN; safi++) |
d62a17ae | 1056 | peer->nsf[afi][safi] = 0; |
1057 | } | |
1058 | ||
1059 | /* set last reset time */ | |
1060 | peer->resettime = peer->uptime = bgp_clock(); | |
1061 | ||
1062 | if (BGP_DEBUG(update_groups, UPDATE_GROUPS)) | |
1063 | zlog_debug("%s remove from all update group", | |
1064 | peer->host); | |
1065 | update_group_remove_peer_afs(peer); | |
1066 | ||
1067 | hook_call(peer_backward_transition, peer); | |
1068 | ||
1069 | /* Reset peer synctime */ | |
1070 | peer->synctime = 0; | |
1071 | ||
1072 | bgp_bfd_deregister_peer(peer); | |
93406d87 | 1073 | } |
93406d87 | 1074 | |
424ab01d | 1075 | /* stop keepalives */ |
b72b6f4f | 1076 | bgp_keepalives_off(peer); |
424ab01d QY |
1077 | |
1078 | /* Stop read and write threads. */ | |
1079 | bgp_writes_off(peer); | |
1080 | bgp_reads_off(peer); | |
1081 | ||
387f984e QY |
1082 | THREAD_OFF(peer->t_connect_check_r); |
1083 | THREAD_OFF(peer->t_connect_check_w); | |
d62a17ae | 1084 | |
1085 | /* Stop all timers. */ | |
1086 | BGP_TIMER_OFF(peer->t_start); | |
1087 | BGP_TIMER_OFF(peer->t_connect); | |
1088 | BGP_TIMER_OFF(peer->t_holdtime); | |
d62a17ae | 1089 | BGP_TIMER_OFF(peer->t_routeadv); |
d62a17ae | 1090 | |
1091 | /* Clear input and output buffer. */ | |
424ab01d | 1092 | pthread_mutex_lock(&peer->io_mtx); |
d3ecc69e | 1093 | { |
424ab01d QY |
1094 | if (peer->ibuf) |
1095 | stream_fifo_clean(peer->ibuf); | |
d3ecc69e QY |
1096 | if (peer->obuf) |
1097 | stream_fifo_clean(peer->obuf); | |
424ab01d QY |
1098 | |
1099 | if (peer->ibuf_work) | |
1100 | stream_reset(peer->ibuf_work); | |
1101 | if (peer->obuf_work) | |
1102 | stream_reset(peer->obuf_work); | |
1103 | ||
1104 | if (peer->curr) { | |
1105 | stream_free(peer->curr); | |
1106 | peer->curr = NULL; | |
1107 | } | |
d3ecc69e | 1108 | } |
424ab01d | 1109 | pthread_mutex_unlock(&peer->io_mtx); |
d62a17ae | 1110 | |
1111 | /* Close of file descriptor. */ | |
1112 | if (peer->fd >= 0) { | |
1113 | close(peer->fd); | |
1114 | peer->fd = -1; | |
93406d87 | 1115 | } |
1116 | ||
05c7a1cc QY |
1117 | FOREACH_AFI_SAFI (afi, safi) { |
1118 | /* Reset all negotiated variables */ | |
1119 | peer->afc_nego[afi][safi] = 0; | |
1120 | peer->afc_adv[afi][safi] = 0; | |
1121 | peer->afc_recv[afi][safi] = 0; | |
1122 | ||
1123 | /* peer address family capability flags*/ | |
1124 | peer->af_cap[afi][safi] = 0; | |
1125 | ||
1126 | /* peer address family status flags*/ | |
1127 | peer->af_sflags[afi][safi] = 0; | |
1128 | ||
1129 | /* Received ORF prefix-filter */ | |
1130 | peer->orf_plist[afi][safi] = NULL; | |
1131 | ||
1132 | if ((peer->status == OpenConfirm) | |
1133 | || (peer->status == Established)) { | |
1134 | /* ORF received prefix-filter pnt */ | |
1135 | sprintf(orf_name, "%s.%d.%d", peer->host, afi, safi); | |
1136 | prefix_bgp_orf_remove_all(afi, orf_name); | |
d62a17ae | 1137 | } |
05c7a1cc | 1138 | } |
d62a17ae | 1139 | |
1140 | /* Reset keepalive and holdtime */ | |
d25e4efc | 1141 | if (PEER_OR_GROUP_TIMER_SET(peer)) { |
d62a17ae | 1142 | peer->v_keepalive = peer->keepalive; |
1143 | peer->v_holdtime = peer->holdtime; | |
1144 | } else { | |
1145 | peer->v_keepalive = peer->bgp->default_keepalive; | |
1146 | peer->v_holdtime = peer->bgp->default_holdtime; | |
1ff9a340 | 1147 | } |
d62a17ae | 1148 | |
1149 | peer->update_time = 0; | |
1150 | ||
1151 | /* Until we are sure that there is no problem about prefix count | |
1152 | this should be commented out.*/ | |
718e3744 | 1153 | #if 0 |
1154 | /* Reset prefix count */ | |
1155 | peer->pcount[AFI_IP][SAFI_UNICAST] = 0; | |
1156 | peer->pcount[AFI_IP][SAFI_MULTICAST] = 0; | |
cd1964ff | 1157 | peer->pcount[AFI_IP][SAFI_LABELED_UNICAST] = 0; |
718e3744 | 1158 | peer->pcount[AFI_IP][SAFI_MPLS_VPN] = 0; |
1159 | peer->pcount[AFI_IP6][SAFI_UNICAST] = 0; | |
1160 | peer->pcount[AFI_IP6][SAFI_MULTICAST] = 0; | |
cd1964ff | 1161 | peer->pcount[AFI_IP6][SAFI_LABELED_UNICAST] = 0; |
718e3744 | 1162 | #endif /* 0 */ |
1163 | ||
d62a17ae | 1164 | if (!CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE) |
1165 | && !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
1166 | peer_delete(peer); | |
1167 | ret = -1; | |
1168 | } else { | |
1169 | bgp_peer_conf_if_to_su_update(peer); | |
1170 | } | |
1171 | ||
1172 | return ret; | |
718e3744 | 1173 | } |
1174 | ||
1175 | /* BGP peer is stoped by the error. */ | |
d62a17ae | 1176 | static int bgp_stop_with_error(struct peer *peer) |
718e3744 | 1177 | { |
d62a17ae | 1178 | /* Double start timer. */ |
1179 | peer->v_start *= 2; | |
1180 | ||
1181 | /* Overflow check. */ | |
1182 | if (peer->v_start >= (60 * 2)) | |
1183 | peer->v_start = (60 * 2); | |
1184 | ||
1185 | if (peer_dynamic_neighbor(peer)) { | |
1186 | if (bgp_debug_neighbor_events(peer)) | |
1187 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1188 | peer_delete(peer); | |
1189 | return -1; | |
1190 | } | |
1191 | ||
1192 | return (bgp_stop(peer)); | |
718e3744 | 1193 | } |
1194 | ||
397b5bde LR |
1195 | |
1196 | /* something went wrong, send notify and tear down */ | |
d62a17ae | 1197 | static int bgp_stop_with_notify(struct peer *peer, u_char code, u_char sub_code) |
397b5bde | 1198 | { |
d62a17ae | 1199 | /* Send notify to remote peer */ |
1200 | bgp_notify_send(peer, code, sub_code); | |
1201 | ||
1202 | if (peer_dynamic_neighbor(peer)) { | |
1203 | if (bgp_debug_neighbor_events(peer)) | |
1204 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1205 | peer_delete(peer); | |
1206 | return -1; | |
1207 | } | |
f14e6fdb | 1208 | |
d62a17ae | 1209 | /* Clear start timer value to default. */ |
1210 | peer->v_start = BGP_INIT_START_TIMER; | |
397b5bde | 1211 | |
d62a17ae | 1212 | return (bgp_stop(peer)); |
397b5bde LR |
1213 | } |
1214 | ||
07a16526 QY |
1215 | /** |
1216 | * Determines whether a TCP session has successfully established for a peer and | |
1217 | * events as appropriate. | |
1218 | * | |
1219 | * This function is called when setting up a new session. After connect() is | |
387f984e QY |
1220 | * called on the peer's socket (in bgp_start()), the fd is passed to poll() |
1221 | * to wait for connection success or failure. When poll() returns, this | |
07a16526 | 1222 | * function is called to evaluate the result. |
387f984e QY |
1223 | * |
1224 | * Due to differences in behavior of poll() on Linux and BSD - specifically, | |
1225 | * the value of .revents in the case of a closed connection - this function is | |
1226 | * scheduled both for a read and a write event. The write event is triggered | |
1227 | * when the connection is established. A read event is triggered when the | |
1228 | * connection is closed. Thus we need to cancel whichever one did not occur. | |
07a16526 QY |
1229 | */ |
1230 | static int bgp_connect_check(struct thread *thread) | |
1231 | { | |
1232 | int status; | |
1233 | socklen_t slen; | |
1234 | int ret; | |
1235 | struct peer *peer; | |
1236 | ||
1237 | peer = THREAD_ARG(thread); | |
424ab01d QY |
1238 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); |
1239 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); | |
1240 | assert(!peer->t_read); | |
1241 | assert(!peer->t_write); | |
07a16526 | 1242 | |
387f984e QY |
1243 | THREAD_OFF(peer->t_connect_check_r); |
1244 | THREAD_OFF(peer->t_connect_check_w); | |
dc1188bb | 1245 | |
07a16526 QY |
1246 | /* Check file descriptor. */ |
1247 | slen = sizeof(status); | |
1248 | ret = getsockopt(peer->fd, SOL_SOCKET, SO_ERROR, (void *)&status, | |
1249 | &slen); | |
1250 | ||
1251 | /* If getsockopt is fail, this is fatal error. */ | |
1252 | if (ret < 0) { | |
1253 | zlog_info("can't get sockopt for nonblocking connect"); | |
1254 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
1255 | return -1; | |
1256 | } | |
1257 | ||
1258 | /* When status is 0 then TCP connection is established. */ | |
1259 | if (status == 0) { | |
1260 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
1261 | return 1; | |
1262 | } else { | |
1263 | if (bgp_debug_neighbor_events(peer)) | |
1264 | zlog_debug("%s [Event] Connect failed (%s)", peer->host, | |
1265 | safe_strerror(errno)); | |
1266 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1267 | return 0; | |
1268 | } | |
1269 | } | |
397b5bde | 1270 | |
718e3744 | 1271 | /* TCP connection open. Next we send open message to remote peer. And |
1272 | add read thread for reading open message. */ | |
d62a17ae | 1273 | static int bgp_connect_success(struct peer *peer) |
718e3744 | 1274 | { |
d62a17ae | 1275 | if (peer->fd < 0) { |
1276 | zlog_err("bgp_connect_success peer's fd is negative value %d", | |
1277 | peer->fd); | |
1278 | bgp_stop(peer); | |
1279 | return -1; | |
1280 | } | |
1281 | ||
1282 | if (bgp_getsockname(peer) < 0) { | |
1283 | zlog_err("%s: bgp_getsockname(): failed for peer %s, fd %d", | |
1284 | __FUNCTION__, peer->host, peer->fd); | |
1285 | bgp_notify_send(peer, BGP_NOTIFY_FSM_ERR, | |
1286 | 0); /* internal error */ | |
424ab01d | 1287 | bgp_writes_on(peer); |
d62a17ae | 1288 | return -1; |
1289 | } | |
1290 | ||
424ab01d | 1291 | bgp_reads_on(peer); |
d62a17ae | 1292 | |
1293 | if (bgp_debug_neighbor_events(peer)) { | |
1294 | char buf1[SU_ADDRSTRLEN]; | |
1295 | ||
1296 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) | |
1297 | zlog_debug("%s open active, local address %s", | |
1298 | peer->host, | |
1299 | sockunion2str(peer->su_local, buf1, | |
1300 | SU_ADDRSTRLEN)); | |
1301 | else | |
1302 | zlog_debug("%s passive open", peer->host); | |
1303 | } | |
1304 | ||
1305 | bgp_open_send(peer); | |
1306 | ||
1307 | return 0; | |
718e3744 | 1308 | } |
1309 | ||
1310 | /* TCP connect fail */ | |
d62a17ae | 1311 | static int bgp_connect_fail(struct peer *peer) |
718e3744 | 1312 | { |
d62a17ae | 1313 | if (peer_dynamic_neighbor(peer)) { |
1314 | if (bgp_debug_neighbor_events(peer)) | |
1315 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1316 | peer_delete(peer); | |
1317 | return -1; | |
1318 | } | |
1319 | ||
1320 | return (bgp_stop(peer)); | |
718e3744 | 1321 | } |
1322 | ||
1323 | /* This function is the first starting point of all BGP connection. It | |
1324 | try to connect to remote peer with non-blocking IO. */ | |
d62a17ae | 1325 | int bgp_start(struct peer *peer) |
718e3744 | 1326 | { |
d62a17ae | 1327 | int status; |
1328 | int connected = 0; | |
1329 | ||
1330 | bgp_peer_conf_if_to_su_update(peer); | |
1331 | ||
1332 | if (peer->su.sa.sa_family == AF_UNSPEC) { | |
1333 | if (bgp_debug_neighbor_events(peer)) | |
1334 | zlog_debug( | |
1335 | "%s [FSM] Unable to get neighbor's IP address, waiting...", | |
1336 | peer->host); | |
1337 | return -1; | |
1338 | } | |
1339 | ||
1340 | if (BGP_PEER_START_SUPPRESSED(peer)) { | |
1341 | if (bgp_debug_neighbor_events(peer)) | |
1342 | zlog_err( | |
1343 | "%s [FSM] Trying to start suppressed peer" | |
1344 | " - this is never supposed to happen!", | |
1345 | peer->host); | |
1346 | return -1; | |
1347 | } | |
1348 | ||
1349 | /* Scrub some information that might be left over from a previous, | |
1350 | * session | |
1351 | */ | |
1352 | /* Connection information. */ | |
1353 | if (peer->su_local) { | |
1354 | sockunion_free(peer->su_local); | |
1355 | peer->su_local = NULL; | |
1356 | } | |
1357 | ||
1358 | if (peer->su_remote) { | |
1359 | sockunion_free(peer->su_remote); | |
1360 | peer->su_remote = NULL; | |
1361 | } | |
1362 | ||
1363 | /* Clear remote router-id. */ | |
1364 | peer->remote_id.s_addr = 0; | |
1365 | ||
1366 | /* Clear peer capability flag. */ | |
1367 | peer->cap = 0; | |
1368 | ||
1369 | /* If the peer is passive mode, force to move to Active mode. */ | |
1370 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE)) { | |
1371 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1372 | return 0; | |
1373 | } | |
1374 | ||
1375 | /* Register to be notified on peer up */ | |
1376 | if (peer->sort == BGP_PEER_EBGP && peer->ttl == 1 | |
1377 | && !CHECK_FLAG(peer->flags, PEER_FLAG_DISABLE_CONNECTED_CHECK) | |
1378 | && !bgp_flag_check(peer->bgp, BGP_FLAG_DISABLE_NH_CONNECTED_CHK)) | |
1379 | connected = 1; | |
1380 | else | |
1381 | connected = 0; | |
1382 | ||
1383 | if (!bgp_find_or_add_nexthop(peer->bgp, | |
1384 | family2afi(peer->su.sa.sa_family), NULL, | |
1385 | peer, connected)) { | |
1386 | #if defined(HAVE_CUMULUS) | |
1387 | if (bgp_debug_neighbor_events(peer)) | |
1388 | zlog_debug("%s [FSM] Waiting for NHT", peer->host); | |
1389 | ||
1390 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1391 | return 0; | |
b5826a12 | 1392 | #endif |
718e3744 | 1393 | } |
d62a17ae | 1394 | |
424ab01d QY |
1395 | assert(!peer->t_write); |
1396 | assert(!peer->t_read); | |
1397 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); | |
1398 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); | |
d62a17ae | 1399 | status = bgp_connect(peer); |
1400 | ||
1401 | switch (status) { | |
1402 | case connect_error: | |
1403 | if (bgp_debug_neighbor_events(peer)) | |
1404 | zlog_debug("%s [FSM] Connect error", peer->host); | |
1405 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1406 | break; | |
1407 | case connect_success: | |
1408 | if (bgp_debug_neighbor_events(peer)) | |
1409 | zlog_debug( | |
1410 | "%s [FSM] Connect immediately success, fd %d", | |
1411 | peer->host, peer->fd); | |
1412 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
1413 | break; | |
1414 | case connect_in_progress: | |
1415 | /* To check nonblocking connect, we wait until socket is | |
1416 | readable or writable. */ | |
1417 | if (bgp_debug_neighbor_events(peer)) | |
1418 | zlog_debug( | |
1419 | "%s [FSM] Non blocking connect waiting result, fd %d", | |
1420 | peer->host, peer->fd); | |
1421 | if (peer->fd < 0) { | |
1422 | zlog_err("bgp_start peer's fd is negative value %d", | |
1423 | peer->fd); | |
1424 | return -1; | |
1425 | } | |
becedef6 | 1426 | /* |
387f984e QY |
1427 | * - when the socket becomes ready, poll() will signify POLLOUT |
1428 | * - if it fails to connect, poll() will signify POLLHUP | |
1429 | * - POLLHUP is handled as a 'read' event by thread.c | |
1430 | * | |
1431 | * therefore, we schedule both a read and a write event with | |
1432 | * bgp_connect_check() as the handler for each and cancel the | |
1433 | * unused event in that function. | |
becedef6 | 1434 | */ |
424ab01d | 1435 | thread_add_read(bm->master, bgp_connect_check, peer, peer->fd, |
387f984e QY |
1436 | &peer->t_connect_check_r); |
1437 | thread_add_write(bm->master, bgp_connect_check, peer, peer->fd, | |
1438 | &peer->t_connect_check_w); | |
d62a17ae | 1439 | break; |
1440 | } | |
1441 | return 0; | |
718e3744 | 1442 | } |
1443 | ||
1444 | /* Connect retry timer is expired when the peer status is Connect. */ | |
d62a17ae | 1445 | static int bgp_reconnect(struct peer *peer) |
718e3744 | 1446 | { |
d62a17ae | 1447 | if (bgp_stop(peer) < 0) |
1448 | return -1; | |
1ff9a340 | 1449 | |
d62a17ae | 1450 | bgp_start(peer); |
1451 | return 0; | |
718e3744 | 1452 | } |
1453 | ||
d62a17ae | 1454 | static int bgp_fsm_open(struct peer *peer) |
718e3744 | 1455 | { |
d62a17ae | 1456 | /* Send keepalive and make keepalive timer */ |
1457 | bgp_keepalive_send(peer); | |
718e3744 | 1458 | |
d62a17ae | 1459 | /* Reset holdtimer value. */ |
1460 | BGP_TIMER_OFF(peer->t_holdtime); | |
718e3744 | 1461 | |
d62a17ae | 1462 | return 0; |
718e3744 | 1463 | } |
1464 | ||
397b5bde LR |
1465 | /* FSM error, unexpected event. This is error of BGP connection. So cut the |
1466 | peer and change to Idle status. */ | |
d62a17ae | 1467 | static int bgp_fsm_event_error(struct peer *peer) |
397b5bde | 1468 | { |
d62a17ae | 1469 | zlog_err("%s [FSM] unexpected packet received in state %s", peer->host, |
1470 | lookup_msg(bgp_status_msg, peer->status, NULL)); | |
397b5bde | 1471 | |
d62a17ae | 1472 | return bgp_stop_with_notify(peer, BGP_NOTIFY_FSM_ERR, 0); |
397b5bde LR |
1473 | } |
1474 | ||
718e3744 | 1475 | /* Hold timer expire. This is error of BGP connection. So cut the |
1476 | peer and change to Idle status. */ | |
d62a17ae | 1477 | static int bgp_fsm_holdtime_expire(struct peer *peer) |
718e3744 | 1478 | { |
d62a17ae | 1479 | if (bgp_debug_neighbor_events(peer)) |
1480 | zlog_debug("%s [FSM] Hold timer expire", peer->host); | |
718e3744 | 1481 | |
d62a17ae | 1482 | return bgp_stop_with_notify(peer, BGP_NOTIFY_HOLD_ERR, 0); |
718e3744 | 1483 | } |
1484 | ||
727c4f87 QY |
1485 | /** |
1486 | * Transition to Established state. | |
1487 | * | |
1488 | * Convert peer from stub to full fledged peer, set some timers, and generate | |
1489 | * initial updates. | |
1490 | */ | |
d62a17ae | 1491 | static int bgp_establish(struct peer *peer) |
718e3744 | 1492 | { |
d62a17ae | 1493 | afi_t afi; |
1494 | safi_t safi; | |
1495 | int nsf_af_count = 0; | |
1496 | int ret = 0; | |
1497 | struct peer *other; | |
1498 | ||
1499 | other = peer->doppelganger; | |
1500 | peer = peer_xfer_conn(peer); | |
1501 | if (!peer) { | |
1502 | zlog_err("%%Neighbor failed in xfer_conn"); | |
1503 | return -1; | |
93406d87 | 1504 | } |
93406d87 | 1505 | |
d62a17ae | 1506 | if (other == peer) |
9d303b37 DL |
1507 | ret = |
1508 | 1; /* bgp_establish specific code when xfer_conn | |
1509 | happens. */ | |
d62a17ae | 1510 | |
1511 | /* Reset capability open status flag. */ | |
1512 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN)) | |
1513 | SET_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN); | |
1514 | ||
1515 | /* Clear start timer value to default. */ | |
1516 | peer->v_start = BGP_INIT_START_TIMER; | |
1517 | ||
1518 | /* Increment established count. */ | |
1519 | peer->established++; | |
1520 | bgp_fsm_change_status(peer, Established); | |
1521 | ||
1522 | /* bgp log-neighbor-changes of neighbor Up */ | |
1523 | if (bgp_flag_check(peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { | |
1524 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); | |
1525 | zlog_info("%%ADJCHANGE: neighbor %s(%s) in vrf %s Up", | |
1526 | peer->host, | |
1527 | (peer->hostname) ? peer->hostname : "Unknown", | |
1528 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) ? vrf->name | |
1529 | : "Default") | |
1530 | : ""); | |
1531 | } | |
1532 | /* assign update-group/subgroup */ | |
1533 | update_group_adjust_peer_afs(peer); | |
1534 | ||
1535 | /* graceful restart */ | |
1536 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
1537 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 1538 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) { |
d62a17ae | 1539 | if (peer->afc_nego[afi][safi] |
1540 | && CHECK_FLAG(peer->cap, PEER_CAP_RESTART_ADV) | |
1541 | && CHECK_FLAG(peer->af_cap[afi][safi], | |
1542 | PEER_CAP_RESTART_AF_RCV)) { | |
1543 | if (peer->nsf[afi][safi] | |
1544 | && !CHECK_FLAG( | |
1545 | peer->af_cap[afi][safi], | |
1546 | PEER_CAP_RESTART_AF_PRESERVE_RCV)) | |
1547 | bgp_clear_stale_route(peer, afi, safi); | |
1548 | ||
1549 | peer->nsf[afi][safi] = 1; | |
1550 | nsf_af_count++; | |
1551 | } else { | |
1552 | if (peer->nsf[afi][safi]) | |
1553 | bgp_clear_stale_route(peer, afi, safi); | |
1554 | peer->nsf[afi][safi] = 0; | |
1555 | } | |
1556 | } | |
1557 | ||
1558 | if (nsf_af_count) | |
1559 | SET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1560 | else { | |
1561 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1562 | if (peer->t_gr_stale) { | |
1563 | BGP_TIMER_OFF(peer->t_gr_stale); | |
1564 | if (bgp_debug_neighbor_events(peer)) | |
1565 | zlog_debug( | |
1566 | "%s graceful restart stalepath timer stopped", | |
1567 | peer->host); | |
1568 | } | |
1569 | } | |
93406d87 | 1570 | |
d62a17ae | 1571 | if (peer->t_gr_restart) { |
1572 | BGP_TIMER_OFF(peer->t_gr_restart); | |
1573 | if (bgp_debug_neighbor_events(peer)) | |
1574 | zlog_debug("%s graceful restart timer stopped", | |
1575 | peer->host); | |
1576 | } | |
718e3744 | 1577 | |
d62a17ae | 1578 | hook_call(peer_established, peer); |
1579 | ||
9eb217ff QY |
1580 | /* Reset uptime, turn on keepalives, send current table. */ |
1581 | if (!peer->v_holdtime) | |
1582 | bgp_keepalives_on(peer); | |
1583 | ||
d62a17ae | 1584 | peer->uptime = bgp_clock(); |
1585 | ||
1586 | /* Send route-refresh when ORF is enabled */ | |
05c7a1cc QY |
1587 | FOREACH_AFI_SAFI (afi, safi) { |
1588 | if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1589 | PEER_CAP_ORF_PREFIX_SM_ADV)) { | |
d62a17ae | 1590 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc QY |
1591 | PEER_CAP_ORF_PREFIX_RM_RCV)) |
1592 | bgp_route_refresh_send(peer, afi, safi, | |
1593 | ORF_TYPE_PREFIX, | |
1594 | REFRESH_IMMEDIATE, 0); | |
1595 | else if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1596 | PEER_CAP_ORF_PREFIX_RM_OLD_RCV)) | |
1597 | bgp_route_refresh_send(peer, afi, safi, | |
1598 | ORF_TYPE_PREFIX_OLD, | |
1599 | REFRESH_IMMEDIATE, 0); | |
1600 | } | |
1601 | } | |
d62a17ae | 1602 | |
1603 | /* First update is deferred until ORF or ROUTE-REFRESH is received */ | |
05c7a1cc QY |
1604 | FOREACH_AFI_SAFI (afi, safi) { |
1605 | if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1606 | PEER_CAP_ORF_PREFIX_RM_ADV)) | |
d62a17ae | 1607 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc QY |
1608 | PEER_CAP_ORF_PREFIX_SM_RCV) |
1609 | || CHECK_FLAG(peer->af_cap[afi][safi], | |
1610 | PEER_CAP_ORF_PREFIX_SM_OLD_RCV)) | |
1611 | SET_FLAG(peer->af_sflags[afi][safi], | |
1612 | PEER_STATUS_ORF_WAIT_REFRESH); | |
1613 | } | |
d62a17ae | 1614 | |
1615 | bgp_announce_peer(peer); | |
1616 | ||
1617 | /* Start the route advertisement timer to send updates to the peer - if | |
1618 | * BGP | |
1619 | * is not in read-only mode. If it is, the timer will be started at the | |
1620 | * end | |
1621 | * of read-only mode. | |
1622 | */ | |
1623 | if (!bgp_update_delay_active(peer->bgp)) { | |
1624 | BGP_TIMER_OFF(peer->t_routeadv); | |
1625 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
1626 | } | |
718e3744 | 1627 | |
d62a17ae | 1628 | if (peer->doppelganger && (peer->doppelganger->status != Deleted)) { |
1629 | if (bgp_debug_neighbor_events(peer)) | |
1630 | zlog_debug( | |
1631 | "[Event] Deleting stub connection for peer %s", | |
1632 | peer->host); | |
1633 | ||
1634 | if (peer->doppelganger->status > Active) | |
1635 | bgp_notify_send(peer->doppelganger, BGP_NOTIFY_CEASE, | |
1636 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
1637 | else | |
1638 | peer_delete(peer->doppelganger); | |
718e3744 | 1639 | } |
1640 | ||
d62a17ae | 1641 | bgp_bfd_register_peer(peer); |
1642 | return ret; | |
718e3744 | 1643 | } |
1644 | ||
1645 | /* Keepalive packet is received. */ | |
d62a17ae | 1646 | static int bgp_fsm_keepalive(struct peer *peer) |
718e3744 | 1647 | { |
d62a17ae | 1648 | BGP_TIMER_OFF(peer->t_holdtime); |
1649 | return 0; | |
718e3744 | 1650 | } |
1651 | ||
1652 | /* Update packet is received. */ | |
d62a17ae | 1653 | static int bgp_fsm_update(struct peer *peer) |
718e3744 | 1654 | { |
d62a17ae | 1655 | BGP_TIMER_OFF(peer->t_holdtime); |
1656 | return 0; | |
718e3744 | 1657 | } |
1658 | ||
1659 | /* This is empty event. */ | |
d62a17ae | 1660 | static int bgp_ignore(struct peer *peer) |
718e3744 | 1661 | { |
d62a17ae | 1662 | zlog_err( |
1663 | "%s [FSM] Ignoring event %s in state %s, prior events %s, %s, fd %d", | |
1664 | peer->host, bgp_event_str[peer->cur_event], | |
1665 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1666 | bgp_event_str[peer->last_event], | |
1667 | bgp_event_str[peer->last_major_event], peer->fd); | |
1668 | return 0; | |
718e3744 | 1669 | } |
6b0655a2 | 1670 | |
6403814c | 1671 | /* This is to handle unexpected events.. */ |
d62a17ae | 1672 | static int bgp_fsm_exeption(struct peer *peer) |
6403814c | 1673 | { |
d62a17ae | 1674 | zlog_err( |
1675 | "%s [FSM] Unexpected event %s in state %s, prior events %s, %s, fd %d", | |
1676 | peer->host, bgp_event_str[peer->cur_event], | |
1677 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1678 | bgp_event_str[peer->last_event], | |
1679 | bgp_event_str[peer->last_major_event], peer->fd); | |
1680 | return (bgp_stop(peer)); | |
6403814c DS |
1681 | } |
1682 | ||
d62a17ae | 1683 | void bgp_fsm_nht_update(struct peer *peer, int valid) |
fc9a856f | 1684 | { |
d62a17ae | 1685 | if (!peer) |
1686 | return; | |
1687 | ||
1688 | switch (peer->status) { | |
1689 | case Idle: | |
1690 | if (valid) | |
1691 | BGP_EVENT_ADD(peer, BGP_Start); | |
1692 | break; | |
1693 | case Connect: | |
1694 | if (!valid) { | |
1695 | BGP_TIMER_OFF(peer->t_connect); | |
1696 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
1697 | } | |
1698 | break; | |
1699 | case Active: | |
1700 | if (valid) { | |
1701 | BGP_TIMER_OFF(peer->t_connect); | |
1702 | BGP_EVENT_ADD(peer, ConnectRetry_timer_expired); | |
1703 | } | |
1704 | break; | |
1705 | case OpenSent: | |
1706 | case OpenConfirm: | |
1707 | case Established: | |
1708 | if (!valid && (peer->gtsm_hops == 1)) | |
1709 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
1710 | case Clearing: | |
1711 | case Deleted: | |
1712 | default: | |
1713 | break; | |
fc9a856f | 1714 | } |
fc9a856f DS |
1715 | } |
1716 | ||
1717 | ||
718e3744 | 1718 | /* Finite State Machine structure */ |
fda1d3e0 | 1719 | static const struct { |
d62a17ae | 1720 | int (*func)(struct peer *); |
1721 | int next_state; | |
1722 | } FSM[BGP_STATUS_MAX - 1][BGP_EVENTS_MAX - 1] = { | |
1723 | { | |
1724 | /* Idle state: In Idle state, all events other than BGP_Start is | |
1725 | ignored. With BGP_Start event, finite state machine calls | |
1726 | bgp_start(). */ | |
1727 | {bgp_start, Connect}, /* BGP_Start */ | |
1728 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1729 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1730 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1731 | {bgp_ignore, Idle}, /* TCP_connection_open_failed */ | |
1732 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1733 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ | |
1734 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
1735 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
1736 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
1737 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
1738 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
1739 | {bgp_ignore, Idle}, /* Receive_NOTIFICATION_message */ | |
1740 | {bgp_ignore, Idle}, /* Clearing_Completed */ | |
1741 | }, | |
1742 | { | |
1743 | /* Connect */ | |
1744 | {bgp_ignore, Connect}, /* BGP_Start */ | |
1745 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1746 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1747 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1748 | {bgp_connect_fail, Active}, /* TCP_connection_open_failed */ | |
1749 | {bgp_connect_fail, Idle}, /* TCP_fatal_error */ | |
1750 | {bgp_reconnect, Connect}, /* ConnectRetry_timer_expired */ | |
1751 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ | |
1752 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1753 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1754 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
1755 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1756 | {bgp_stop, Idle}, /* Receive_NOTIFICATION_message */ | |
1757 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1758 | }, | |
1759 | { | |
1760 | /* Active, */ | |
1761 | {bgp_ignore, Active}, /* BGP_Start */ | |
1762 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1763 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1764 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1765 | {bgp_ignore, Active}, /* TCP_connection_open_failed */ | |
1766 | {bgp_fsm_exeption, Idle}, /* TCP_fatal_error */ | |
1767 | {bgp_start, Connect}, /* ConnectRetry_timer_expired */ | |
1768 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ | |
1769 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1770 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1771 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
1772 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1773 | {bgp_fsm_exeption, Idle}, /* Receive_NOTIFICATION_message */ | |
1774 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1775 | }, | |
1776 | { | |
1777 | /* OpenSent, */ | |
1778 | {bgp_ignore, OpenSent}, /* BGP_Start */ | |
1779 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1780 | {bgp_stop, Active}, /* TCP_connection_open */ | |
1781 | {bgp_stop, Active}, /* TCP_connection_closed */ | |
1782 | {bgp_stop, Active}, /* TCP_connection_open_failed */ | |
1783 | {bgp_stop, Active}, /* TCP_fatal_error */ | |
1784 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ | |
1785 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
1786 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1787 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ | |
1788 | {bgp_fsm_event_error, Idle}, /* Receive_KEEPALIVE_message */ | |
1789 | {bgp_fsm_event_error, Idle}, /* Receive_UPDATE_message */ | |
1790 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
1791 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1792 | }, | |
1793 | { | |
1794 | /* OpenConfirm, */ | |
1795 | {bgp_ignore, OpenConfirm}, /* BGP_Start */ | |
1796 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1797 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1798 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1799 | {bgp_stop, Idle}, /* TCP_connection_open_failed */ | |
1800 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1801 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ | |
1802 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
1803 | {bgp_ignore, OpenConfirm}, /* KeepAlive_timer_expired */ | |
1804 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1805 | {bgp_establish, Established}, /* Receive_KEEPALIVE_message */ | |
1806 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1807 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
1808 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1809 | }, | |
1810 | { | |
1811 | /* Established, */ | |
1812 | {bgp_ignore, Established}, /* BGP_Start */ | |
1813 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
1814 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1815 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
1816 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
1817 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
1818 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
1819 | {bgp_fsm_holdtime_expire, Clearing}, /* Hold_Timer_expired */ | |
03014d48 QY |
1820 | {bgp_ignore, Established}, /* KeepAlive_timer_expired */ |
1821 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
d62a17ae | 1822 | {bgp_fsm_keepalive, |
1823 | Established}, /* Receive_KEEPALIVE_message */ | |
1824 | {bgp_fsm_update, Established}, /* Receive_UPDATE_message */ | |
1825 | {bgp_stop_with_error, | |
1826 | Clearing}, /* Receive_NOTIFICATION_message */ | |
1827 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1828 | }, | |
1829 | { | |
1830 | /* Clearing, */ | |
1831 | {bgp_ignore, Clearing}, /* BGP_Start */ | |
1832 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
1833 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1834 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
1835 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
1836 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
1837 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
1838 | {bgp_stop, Clearing}, /* Hold_Timer_expired */ | |
1839 | {bgp_stop, Clearing}, /* KeepAlive_timer_expired */ | |
1840 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
1841 | {bgp_stop, Clearing}, /* Receive_KEEPALIVE_message */ | |
1842 | {bgp_stop, Clearing}, /* Receive_UPDATE_message */ | |
1843 | {bgp_stop, Clearing}, /* Receive_NOTIFICATION_message */ | |
1844 | {bgp_clearing_completed, Idle}, /* Clearing_Completed */ | |
1845 | }, | |
1846 | { | |
1847 | /* Deleted, */ | |
1848 | {bgp_ignore, Deleted}, /* BGP_Start */ | |
1849 | {bgp_ignore, Deleted}, /* BGP_Stop */ | |
1850 | {bgp_ignore, Deleted}, /* TCP_connection_open */ | |
1851 | {bgp_ignore, Deleted}, /* TCP_connection_closed */ | |
1852 | {bgp_ignore, Deleted}, /* TCP_connection_open_failed */ | |
1853 | {bgp_ignore, Deleted}, /* TCP_fatal_error */ | |
1854 | {bgp_ignore, Deleted}, /* ConnectRetry_timer_expired */ | |
1855 | {bgp_ignore, Deleted}, /* Hold_Timer_expired */ | |
1856 | {bgp_ignore, Deleted}, /* KeepAlive_timer_expired */ | |
1857 | {bgp_ignore, Deleted}, /* Receive_OPEN_message */ | |
1858 | {bgp_ignore, Deleted}, /* Receive_KEEPALIVE_message */ | |
1859 | {bgp_ignore, Deleted}, /* Receive_UPDATE_message */ | |
1860 | {bgp_ignore, Deleted}, /* Receive_NOTIFICATION_message */ | |
1861 | {bgp_ignore, Deleted}, /* Clearing_Completed */ | |
1862 | }, | |
718e3744 | 1863 | }; |
1864 | ||
718e3744 | 1865 | /* Execute event process. */ |
d62a17ae | 1866 | int bgp_event(struct thread *thread) |
718e3744 | 1867 | { |
d62a17ae | 1868 | int event; |
1869 | struct peer *peer; | |
1870 | int ret; | |
718e3744 | 1871 | |
d62a17ae | 1872 | peer = THREAD_ARG(thread); |
1873 | event = THREAD_VAL(thread); | |
718e3744 | 1874 | |
d62a17ae | 1875 | ret = bgp_event_update(peer, event); |
1ff9a340 | 1876 | |
d62a17ae | 1877 | return (ret); |
1ff9a340 DS |
1878 | } |
1879 | ||
d62a17ae | 1880 | int bgp_event_update(struct peer *peer, int event) |
1ff9a340 | 1881 | { |
d62a17ae | 1882 | int next; |
1883 | int ret = 0; | |
1884 | struct peer *other; | |
1885 | int passive_conn = 0; | |
1886 | int dyn_nbr; | |
1887 | ||
d8151687 QY |
1888 | /* default return code */ |
1889 | ret = FSM_PEER_NOOP; | |
1890 | ||
d62a17ae | 1891 | other = peer->doppelganger; |
1892 | passive_conn = | |
1893 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) ? 1 : 0; | |
1894 | dyn_nbr = peer_dynamic_neighbor(peer); | |
1895 | ||
1896 | /* Logging this event. */ | |
1897 | next = FSM[peer->status - 1][event - 1].next_state; | |
1898 | ||
1899 | if (bgp_debug_neighbor_events(peer) && peer->status != next) | |
1900 | zlog_debug("%s [FSM] %s (%s->%s), fd %d", peer->host, | |
1901 | bgp_event_str[event], | |
1902 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1903 | lookup_msg(bgp_status_msg, next, NULL), peer->fd); | |
1904 | ||
1905 | peer->last_event = peer->cur_event; | |
1906 | peer->cur_event = event; | |
1907 | ||
1908 | /* Call function. */ | |
1909 | if (FSM[peer->status - 1][event - 1].func) | |
1910 | ret = (*(FSM[peer->status - 1][event - 1].func))(peer); | |
1911 | ||
d62a17ae | 1912 | if (ret >= 0) { |
1913 | if (ret == 1 && next == Established) { | |
1914 | /* The case when doppelganger swap accurred in | |
1915 | bgp_establish. | |
1916 | Update the peer pointer accordingly */ | |
d8151687 | 1917 | ret = FSM_PEER_TRANSFERRED; |
d62a17ae | 1918 | peer = other; |
1919 | } | |
1920 | ||
1921 | /* If status is changed. */ | |
d8151687 | 1922 | if (next != peer->status) { |
d62a17ae | 1923 | bgp_fsm_change_status(peer, next); |
1924 | ||
becedef6 QY |
1925 | /* |
1926 | * If we're going to ESTABLISHED then we executed a | |
1927 | * peer transfer. In this case we can either return | |
1928 | * FSM_PEER_TRANSITIONED or FSM_PEER_TRANSFERRED. | |
1929 | * Opting for TRANSFERRED since transfer implies | |
1930 | * session establishment. | |
1931 | */ | |
d8151687 QY |
1932 | if (ret != FSM_PEER_TRANSFERRED) |
1933 | ret = FSM_PEER_TRANSITIONED; | |
1934 | } | |
1935 | ||
d62a17ae | 1936 | /* Make sure timer is set. */ |
1937 | bgp_timer_set(peer); | |
1938 | ||
bea01226 | 1939 | } else { |
becedef6 QY |
1940 | /* |
1941 | * If we got a return value of -1, that means there was an | |
1942 | * error, restart the FSM. Since bgp_stop() was called on the | |
1943 | * peer. only a few fields are safe to access here. In any case | |
1944 | * we need to indicate that the peer was stopped in the return | |
1945 | * code. | |
1946 | */ | |
bea01226 QY |
1947 | if (!dyn_nbr && !passive_conn && peer->bgp) { |
1948 | zlog_err( | |
1949 | "%s [FSM] Failure handling event %s in state %s, " | |
1950 | "prior events %s, %s, fd %d", | |
1951 | peer->host, bgp_event_str[peer->cur_event], | |
1952 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1953 | bgp_event_str[peer->last_event], | |
1954 | bgp_event_str[peer->last_major_event], | |
1955 | peer->fd); | |
1956 | bgp_stop(peer); | |
1957 | bgp_fsm_change_status(peer, Idle); | |
1958 | bgp_timer_set(peer); | |
1959 | } | |
1960 | ret = FSM_PEER_STOPPED; | |
d62a17ae | 1961 | } |
bea01226 | 1962 | |
d62a17ae | 1963 | return ret; |
718e3744 | 1964 | } |