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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" | |
74ffbfe6 | 30 | #include "ringbuf.h" |
718e3744 | 31 | #include "memory.h" |
32 | #include "plist.h" | |
f188f2c4 | 33 | #include "workqueue.h" |
3f9c7369 | 34 | #include "queue.h" |
039f3a34 | 35 | #include "filter.h" |
4dcadbef | 36 | #include "command.h" |
718e3744 | 37 | |
856ca177 | 38 | #include "lib/json.h" |
718e3744 | 39 | #include "bgpd/bgpd.h" |
40 | #include "bgpd/bgp_attr.h" | |
41 | #include "bgpd/bgp_debug.h" | |
42 | #include "bgpd/bgp_fsm.h" | |
43 | #include "bgpd/bgp_packet.h" | |
44 | #include "bgpd/bgp_network.h" | |
45 | #include "bgpd/bgp_route.h" | |
46 | #include "bgpd/bgp_dump.h" | |
47 | #include "bgpd/bgp_open.h" | |
f188f2c4 | 48 | #include "bgpd/bgp_advertise.h" |
3f9c7369 | 49 | #include "bgpd/bgp_updgrp.h" |
ffd0c037 | 50 | #include "bgpd/bgp_nht.h" |
c43ed2e4 | 51 | #include "bgpd/bgp_bfd.h" |
4a1ab8e4 | 52 | #include "bgpd/bgp_memory.h" |
03014d48 | 53 | #include "bgpd/bgp_keepalives.h" |
56257a44 | 54 | #include "bgpd/bgp_io.h" |
c42eab4b | 55 | #include "bgpd/bgp_zebra.h" |
6b0655a2 | 56 | |
d62a17ae | 57 | DEFINE_HOOK(peer_backward_transition, (struct peer * peer), (peer)) |
58 | DEFINE_HOOK(peer_established, (struct peer * peer), (peer)) | |
3012671f | 59 | |
6403814c DS |
60 | /* Definition of display strings corresponding to FSM events. This should be |
61 | * kept consistent with the events defined in bgpd.h | |
62 | */ | |
d62a17ae | 63 | static const char *bgp_event_str[] = { |
64 | NULL, | |
65 | "BGP_Start", | |
66 | "BGP_Stop", | |
67 | "TCP_connection_open", | |
68 | "TCP_connection_closed", | |
69 | "TCP_connection_open_failed", | |
70 | "TCP_fatal_error", | |
71 | "ConnectRetry_timer_expired", | |
72 | "Hold_Timer_expired", | |
73 | "KeepAlive_timer_expired", | |
74 | "Receive_OPEN_message", | |
75 | "Receive_KEEPALIVE_message", | |
76 | "Receive_UPDATE_message", | |
77 | "Receive_NOTIFICATION_message", | |
78 | "Clearing_Completed", | |
6403814c DS |
79 | }; |
80 | ||
718e3744 | 81 | /* BGP FSM (finite state machine) has three types of functions. Type |
82 | one is thread functions. Type two is event functions. Type three | |
83 | is FSM functions. Timer functions are set by bgp_timer_set | |
84 | function. */ | |
85 | ||
86 | /* BGP event function. */ | |
d62a17ae | 87 | int bgp_event(struct thread *); |
718e3744 | 88 | |
89 | /* BGP thread functions. */ | |
d62a17ae | 90 | static int bgp_start_timer(struct thread *); |
91 | static int bgp_connect_timer(struct thread *); | |
92 | static int bgp_holdtime_timer(struct thread *); | |
718e3744 | 93 | |
94 | /* BGP FSM functions. */ | |
d62a17ae | 95 | static int bgp_start(struct peer *); |
718e3744 | 96 | |
d62a17ae | 97 | static void peer_xfer_stats(struct peer *peer_dst, struct peer *peer_src) |
1ff9a340 | 98 | { |
d62a17ae | 99 | /* Copy stats over. These are only the pre-established state stats */ |
100 | peer_dst->open_in += peer_src->open_in; | |
101 | peer_dst->open_out += peer_src->open_out; | |
102 | peer_dst->keepalive_in += peer_src->keepalive_in; | |
103 | peer_dst->keepalive_out += peer_src->keepalive_out; | |
104 | peer_dst->notify_in += peer_src->notify_in; | |
105 | peer_dst->notify_out += peer_src->notify_out; | |
106 | peer_dst->dynamic_cap_in += peer_src->dynamic_cap_in; | |
107 | peer_dst->dynamic_cap_out += peer_src->dynamic_cap_out; | |
1ff9a340 DS |
108 | } |
109 | ||
d62a17ae | 110 | static struct peer *peer_xfer_conn(struct peer *from_peer) |
1ff9a340 | 111 | { |
d62a17ae | 112 | struct peer *peer; |
113 | afi_t afi; | |
114 | safi_t safi; | |
115 | int fd; | |
116 | int status, pstatus; | |
117 | unsigned char last_evt, last_maj_evt; | |
118 | ||
119 | assert(from_peer != NULL); | |
120 | ||
121 | peer = from_peer->doppelganger; | |
122 | ||
123 | if (!peer || !CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE)) | |
124 | return from_peer; | |
125 | ||
126 | if (bgp_debug_neighbor_events(peer)) | |
127 | zlog_debug("%s: peer transfer %p fd %d -> %p fd %d)", | |
128 | from_peer->host, from_peer, from_peer->fd, peer, | |
129 | peer->fd); | |
130 | ||
424ab01d QY |
131 | bgp_writes_off(peer); |
132 | bgp_reads_off(peer); | |
133 | bgp_writes_off(from_peer); | |
134 | bgp_reads_off(from_peer); | |
d62a17ae | 135 | |
136 | BGP_TIMER_OFF(peer->t_routeadv); | |
424ab01d | 137 | BGP_TIMER_OFF(peer->t_connect); |
387f984e QY |
138 | BGP_TIMER_OFF(peer->t_connect_check_r); |
139 | BGP_TIMER_OFF(peer->t_connect_check_w); | |
d62a17ae | 140 | BGP_TIMER_OFF(from_peer->t_routeadv); |
424ab01d | 141 | BGP_TIMER_OFF(from_peer->t_connect); |
387f984e QY |
142 | BGP_TIMER_OFF(from_peer->t_connect_check_r); |
143 | BGP_TIMER_OFF(from_peer->t_connect_check_w); | |
7a86aa5a | 144 | BGP_TIMER_OFF(from_peer->t_process_packet); |
d3ecc69e | 145 | |
becedef6 QY |
146 | /* |
147 | * At this point in time, it is possible that there are packets pending | |
148 | * on various buffers. Those need to be transferred or dropped, | |
149 | * otherwise we'll get spurious failures during session establishment. | |
150 | */ | |
424ab01d QY |
151 | pthread_mutex_lock(&peer->io_mtx); |
152 | pthread_mutex_lock(&from_peer->io_mtx); | |
d3ecc69e | 153 | { |
424ab01d QY |
154 | fd = peer->fd; |
155 | peer->fd = from_peer->fd; | |
156 | from_peer->fd = fd; | |
157 | ||
158 | stream_fifo_clean(peer->ibuf); | |
d3ecc69e | 159 | stream_fifo_clean(peer->obuf); |
d3ecc69e | 160 | |
becedef6 QY |
161 | /* |
162 | * this should never happen, since bgp_process_packet() is the | |
163 | * only task that sets and unsets the current packet and it | |
164 | * runs in our pthread. | |
165 | */ | |
424ab01d QY |
166 | if (peer->curr) { |
167 | zlog_err( | |
168 | "[%s] Dropping pending packet on connection transfer:", | |
169 | peer->host); | |
d7c0a89a QY |
170 | uint16_t type = stream_getc_from(peer->curr, |
171 | BGP_MARKER_SIZE + 2); | |
424ab01d QY |
172 | bgp_dump_packet(peer, type, peer->curr); |
173 | stream_free(peer->curr); | |
174 | peer->curr = NULL; | |
175 | } | |
176 | ||
177 | // copy each packet from old peer's output queue to new peer | |
727c4f87 QY |
178 | while (from_peer->obuf->head) |
179 | stream_fifo_push(peer->obuf, | |
180 | stream_fifo_pop(from_peer->obuf)); | |
424ab01d QY |
181 | |
182 | // copy each packet from old peer's input queue to new peer | |
183 | while (from_peer->ibuf->head) | |
184 | stream_fifo_push(peer->ibuf, | |
185 | stream_fifo_pop(from_peer->ibuf)); | |
7db44ec8 | 186 | |
74ffbfe6 QY |
187 | ringbuf_wipe(peer->ibuf_work); |
188 | ringbuf_copy(peer->ibuf_work, from_peer->ibuf_work, | |
189 | ringbuf_remain(from_peer->ibuf_work)); | |
d3ecc69e | 190 | } |
424ab01d QY |
191 | pthread_mutex_unlock(&from_peer->io_mtx); |
192 | pthread_mutex_unlock(&peer->io_mtx); | |
d62a17ae | 193 | |
194 | peer->as = from_peer->as; | |
195 | peer->v_holdtime = from_peer->v_holdtime; | |
196 | peer->v_keepalive = from_peer->v_keepalive; | |
197 | peer->routeadv = from_peer->routeadv; | |
198 | peer->v_routeadv = from_peer->v_routeadv; | |
199 | peer->v_gr_restart = from_peer->v_gr_restart; | |
200 | peer->cap = from_peer->cap; | |
201 | status = peer->status; | |
202 | pstatus = peer->ostatus; | |
203 | last_evt = peer->last_event; | |
204 | last_maj_evt = peer->last_major_event; | |
205 | peer->status = from_peer->status; | |
206 | peer->ostatus = from_peer->ostatus; | |
207 | peer->last_event = from_peer->last_event; | |
208 | peer->last_major_event = from_peer->last_major_event; | |
209 | from_peer->status = status; | |
210 | from_peer->ostatus = pstatus; | |
211 | from_peer->last_event = last_evt; | |
212 | from_peer->last_major_event = last_maj_evt; | |
213 | peer->remote_id = from_peer->remote_id; | |
214 | ||
215 | if (from_peer->hostname != NULL) { | |
216 | if (peer->hostname) { | |
217 | XFREE(MTYPE_BGP_PEER_HOST, peer->hostname); | |
218 | peer->hostname = NULL; | |
219 | } | |
220 | ||
221 | peer->hostname = from_peer->hostname; | |
222 | from_peer->hostname = NULL; | |
223 | } | |
224 | ||
225 | if (from_peer->domainname != NULL) { | |
226 | if (peer->domainname) { | |
227 | XFREE(MTYPE_BGP_PEER_HOST, peer->domainname); | |
228 | peer->domainname = NULL; | |
229 | } | |
230 | ||
231 | peer->domainname = from_peer->domainname; | |
232 | from_peer->domainname = NULL; | |
233 | } | |
234 | ||
05c7a1cc QY |
235 | FOREACH_AFI_SAFI (afi, safi) { |
236 | peer->af_flags[afi][safi] = from_peer->af_flags[afi][safi]; | |
237 | peer->af_sflags[afi][safi] = from_peer->af_sflags[afi][safi]; | |
238 | peer->af_cap[afi][safi] = from_peer->af_cap[afi][safi]; | |
239 | peer->afc_nego[afi][safi] = from_peer->afc_nego[afi][safi]; | |
240 | peer->afc_adv[afi][safi] = from_peer->afc_adv[afi][safi]; | |
241 | peer->afc_recv[afi][safi] = from_peer->afc_recv[afi][safi]; | |
242 | peer->orf_plist[afi][safi] = from_peer->orf_plist[afi][safi]; | |
243 | } | |
d62a17ae | 244 | |
245 | if (bgp_getsockname(peer) < 0) { | |
246 | zlog_err( | |
247 | "%%bgp_getsockname() failed for %s peer %s fd %d (from_peer fd %d)", | |
248 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER) | |
249 | ? "accept" | |
250 | : ""), | |
251 | peer->host, peer->fd, from_peer->fd); | |
252 | bgp_stop(peer); | |
253 | bgp_stop(from_peer); | |
254 | return NULL; | |
255 | } | |
256 | if (from_peer->status > Active) { | |
257 | if (bgp_getsockname(from_peer) < 0) { | |
258 | zlog_err( | |
259 | "%%bgp_getsockname() failed for %s from_peer %s fd %d (peer fd %d)", | |
260 | (CHECK_FLAG(from_peer->sflags, | |
261 | PEER_STATUS_ACCEPT_PEER) | |
262 | ? "accept" | |
263 | : ""), | |
264 | from_peer->host, from_peer->fd, peer->fd); | |
265 | bgp_stop(from_peer); | |
266 | from_peer = NULL; | |
267 | } | |
268 | } | |
269 | ||
0112e9e0 QY |
270 | |
271 | // Note: peer_xfer_stats() must be called with I/O turned OFF | |
272 | if (from_peer) | |
273 | peer_xfer_stats(peer, from_peer); | |
274 | ||
424ab01d QY |
275 | bgp_reads_on(peer); |
276 | bgp_writes_on(peer); | |
7a86aa5a QY |
277 | thread_add_timer_msec(bm->master, bgp_process_packet, peer, 0, |
278 | &peer->t_process_packet); | |
d62a17ae | 279 | |
d62a17ae | 280 | return (peer); |
1ff9a340 DS |
281 | } |
282 | ||
718e3744 | 283 | /* Hook function called after bgp event is occered. And vty's |
284 | neighbor command invoke this function after making neighbor | |
285 | structure. */ | |
d62a17ae | 286 | void bgp_timer_set(struct peer *peer) |
718e3744 | 287 | { |
d62a17ae | 288 | switch (peer->status) { |
289 | case Idle: | |
290 | /* First entry point of peer's finite state machine. In Idle | |
291 | status start timer is on unless peer is shutdown or peer is | |
292 | inactive. All other timer must be turned off */ | |
f62abc7d PG |
293 | if (BGP_PEER_START_SUPPRESSED(peer) || !peer_active(peer) |
294 | || peer->bgp->vrf_id == VRF_UNKNOWN) { | |
d62a17ae | 295 | BGP_TIMER_OFF(peer->t_start); |
296 | } else { | |
297 | BGP_TIMER_ON(peer->t_start, bgp_start_timer, | |
298 | peer->v_start); | |
299 | } | |
300 | BGP_TIMER_OFF(peer->t_connect); | |
301 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 302 | bgp_keepalives_off(peer); |
d62a17ae | 303 | BGP_TIMER_OFF(peer->t_routeadv); |
304 | break; | |
305 | ||
306 | case Connect: | |
307 | /* After start timer is expired, the peer moves to Connect | |
308 | status. Make sure start timer is off and connect timer is | |
309 | on. */ | |
310 | BGP_TIMER_OFF(peer->t_start); | |
311 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
312 | peer->v_connect); | |
313 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 314 | bgp_keepalives_off(peer); |
d62a17ae | 315 | BGP_TIMER_OFF(peer->t_routeadv); |
316 | break; | |
317 | ||
318 | case Active: | |
319 | /* Active is waiting connection from remote peer. And if | |
320 | connect timer is expired, change status to Connect. */ | |
321 | BGP_TIMER_OFF(peer->t_start); | |
322 | /* If peer is passive mode, do not set connect timer. */ | |
323 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE) | |
324 | || CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
325 | BGP_TIMER_OFF(peer->t_connect); | |
326 | } else { | |
327 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
328 | peer->v_connect); | |
329 | } | |
330 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 331 | bgp_keepalives_off(peer); |
d62a17ae | 332 | BGP_TIMER_OFF(peer->t_routeadv); |
333 | break; | |
334 | ||
335 | case OpenSent: | |
336 | /* OpenSent status. */ | |
337 | BGP_TIMER_OFF(peer->t_start); | |
338 | BGP_TIMER_OFF(peer->t_connect); | |
339 | if (peer->v_holdtime != 0) { | |
340 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
341 | peer->v_holdtime); | |
342 | } else { | |
343 | BGP_TIMER_OFF(peer->t_holdtime); | |
344 | } | |
b72b6f4f | 345 | bgp_keepalives_off(peer); |
d62a17ae | 346 | BGP_TIMER_OFF(peer->t_routeadv); |
347 | break; | |
348 | ||
349 | case OpenConfirm: | |
350 | /* OpenConfirm status. */ | |
351 | BGP_TIMER_OFF(peer->t_start); | |
352 | BGP_TIMER_OFF(peer->t_connect); | |
353 | ||
354 | /* If the negotiated Hold Time value is zero, then the Hold Time | |
355 | timer and KeepAlive timers are not started. */ | |
356 | if (peer->v_holdtime == 0) { | |
357 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 358 | bgp_keepalives_off(peer); |
d62a17ae | 359 | } else { |
360 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
361 | peer->v_holdtime); | |
b72b6f4f | 362 | bgp_keepalives_on(peer); |
d62a17ae | 363 | } |
364 | BGP_TIMER_OFF(peer->t_routeadv); | |
365 | break; | |
366 | ||
367 | case Established: | |
368 | /* In Established status start and connect timer is turned | |
369 | off. */ | |
370 | BGP_TIMER_OFF(peer->t_start); | |
371 | BGP_TIMER_OFF(peer->t_connect); | |
372 | ||
373 | /* Same as OpenConfirm, if holdtime is zero then both holdtime | |
374 | and keepalive must be turned off. */ | |
375 | if (peer->v_holdtime == 0) { | |
376 | BGP_TIMER_OFF(peer->t_holdtime); | |
bea01226 | 377 | bgp_keepalives_off(peer); |
d62a17ae | 378 | } else { |
379 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
380 | peer->v_holdtime); | |
bea01226 | 381 | bgp_keepalives_on(peer); |
d62a17ae | 382 | } |
383 | break; | |
384 | case Deleted: | |
385 | BGP_TIMER_OFF(peer->t_gr_restart); | |
386 | BGP_TIMER_OFF(peer->t_gr_stale); | |
387 | BGP_TIMER_OFF(peer->t_pmax_restart); | |
388 | /* fallthru */ | |
389 | case Clearing: | |
390 | BGP_TIMER_OFF(peer->t_start); | |
391 | BGP_TIMER_OFF(peer->t_connect); | |
392 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 393 | bgp_keepalives_off(peer); |
d62a17ae | 394 | BGP_TIMER_OFF(peer->t_routeadv); |
395 | break; | |
718e3744 | 396 | } |
718e3744 | 397 | } |
398 | ||
399 | /* BGP start timer. This function set BGP_Start event to thread value | |
400 | and process event. */ | |
d62a17ae | 401 | static int bgp_start_timer(struct thread *thread) |
718e3744 | 402 | { |
d62a17ae | 403 | struct peer *peer; |
718e3744 | 404 | |
d62a17ae | 405 | peer = THREAD_ARG(thread); |
406 | peer->t_start = NULL; | |
718e3744 | 407 | |
d62a17ae | 408 | if (bgp_debug_neighbor_events(peer)) |
409 | zlog_debug("%s [FSM] Timer (start timer expire).", peer->host); | |
718e3744 | 410 | |
d62a17ae | 411 | THREAD_VAL(thread) = BGP_Start; |
412 | bgp_event(thread); /* bgp_event unlocks peer */ | |
718e3744 | 413 | |
d62a17ae | 414 | return 0; |
718e3744 | 415 | } |
416 | ||
417 | /* BGP connect retry timer. */ | |
d62a17ae | 418 | static int bgp_connect_timer(struct thread *thread) |
718e3744 | 419 | { |
d62a17ae | 420 | struct peer *peer; |
421 | int ret; | |
422 | ||
423 | peer = THREAD_ARG(thread); | |
424ab01d QY |
424 | |
425 | assert(!peer->t_write); | |
426 | assert(!peer->t_read); | |
427 | ||
d62a17ae | 428 | peer->t_connect = NULL; |
429 | ||
430 | if (bgp_debug_neighbor_events(peer)) | |
431 | zlog_debug("%s [FSM] Timer (connect timer expire)", peer->host); | |
432 | ||
433 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) { | |
434 | bgp_stop(peer); | |
435 | ret = -1; | |
436 | } else { | |
437 | THREAD_VAL(thread) = ConnectRetry_timer_expired; | |
438 | bgp_event(thread); /* bgp_event unlocks peer */ | |
439 | ret = 0; | |
440 | } | |
441 | ||
442 | return ret; | |
718e3744 | 443 | } |
444 | ||
445 | /* BGP holdtime timer. */ | |
d62a17ae | 446 | static int bgp_holdtime_timer(struct thread *thread) |
718e3744 | 447 | { |
d62a17ae | 448 | struct peer *peer; |
718e3744 | 449 | |
d62a17ae | 450 | peer = THREAD_ARG(thread); |
451 | peer->t_holdtime = NULL; | |
718e3744 | 452 | |
d62a17ae | 453 | if (bgp_debug_neighbor_events(peer)) |
454 | zlog_debug("%s [FSM] Timer (holdtime timer expire)", | |
455 | peer->host); | |
718e3744 | 456 | |
d62a17ae | 457 | THREAD_VAL(thread) = Hold_Timer_expired; |
458 | bgp_event(thread); /* bgp_event unlocks peer */ | |
718e3744 | 459 | |
d62a17ae | 460 | return 0; |
718e3744 | 461 | } |
462 | ||
d62a17ae | 463 | int bgp_routeadv_timer(struct thread *thread) |
718e3744 | 464 | { |
d62a17ae | 465 | struct peer *peer; |
718e3744 | 466 | |
d62a17ae | 467 | peer = THREAD_ARG(thread); |
468 | peer->t_routeadv = NULL; | |
718e3744 | 469 | |
d62a17ae | 470 | if (bgp_debug_neighbor_events(peer)) |
471 | zlog_debug("%s [FSM] Timer (routeadv timer expire)", | |
472 | peer->host); | |
718e3744 | 473 | |
d62a17ae | 474 | peer->synctime = bgp_clock(); |
718e3744 | 475 | |
a9794991 | 476 | thread_add_timer_msec(bm->master, bgp_generate_updgrp_packets, peer, 0, |
424ab01d QY |
477 | &peer->t_generate_updgrp_packets); |
478 | ||
d62a17ae | 479 | /* MRAI timer will be started again when FIFO is built, no need to |
480 | * do it here. | |
481 | */ | |
482 | return 0; | |
718e3744 | 483 | } |
484 | ||
e0701b79 | 485 | /* BGP Peer Down Cause */ |
d62a17ae | 486 | const char *peer_down_str[] = {"", |
487 | "Router ID changed", | |
488 | "Remote AS changed", | |
489 | "Local AS change", | |
490 | "Cluster ID changed", | |
491 | "Confederation identifier changed", | |
492 | "Confederation peer changed", | |
493 | "RR client config change", | |
494 | "RS client config change", | |
495 | "Update source change", | |
496 | "Address family activated", | |
497 | "Admin. shutdown", | |
498 | "User reset", | |
499 | "BGP Notification received", | |
500 | "BGP Notification send", | |
501 | "Peer closed the session", | |
502 | "Neighbor deleted", | |
503 | "Peer-group add member", | |
504 | "Peer-group delete member", | |
505 | "Capability changed", | |
506 | "Passive config change", | |
507 | "Multihop config change", | |
508 | "NSF peer closed the session", | |
509 | "Intf peering v6only config change", | |
510 | "BFD down received", | |
511 | "Interface down", | |
512 | "Neighbor address lost"}; | |
513 | ||
514 | static int bgp_graceful_restart_timer_expire(struct thread *thread) | |
e0701b79 | 515 | { |
d62a17ae | 516 | struct peer *peer; |
517 | afi_t afi; | |
518 | safi_t safi; | |
519 | ||
520 | peer = THREAD_ARG(thread); | |
521 | peer->t_gr_restart = NULL; | |
522 | ||
523 | /* NSF delete stale route */ | |
524 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 525 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) |
d62a17ae | 526 | if (peer->nsf[afi][safi]) |
527 | bgp_clear_stale_route(peer, afi, safi); | |
528 | ||
529 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
530 | BGP_TIMER_OFF(peer->t_gr_stale); | |
531 | ||
532 | if (bgp_debug_neighbor_events(peer)) { | |
533 | zlog_debug("%s graceful restart timer expired", peer->host); | |
534 | zlog_debug("%s graceful restart stalepath timer stopped", | |
535 | peer->host); | |
536 | } | |
93406d87 | 537 | |
d62a17ae | 538 | bgp_timer_set(peer); |
93406d87 | 539 | |
d62a17ae | 540 | return 0; |
93406d87 | 541 | } |
542 | ||
d62a17ae | 543 | static int bgp_graceful_stale_timer_expire(struct thread *thread) |
93406d87 | 544 | { |
d62a17ae | 545 | struct peer *peer; |
546 | afi_t afi; | |
547 | safi_t safi; | |
93406d87 | 548 | |
d62a17ae | 549 | peer = THREAD_ARG(thread); |
550 | peer->t_gr_stale = NULL; | |
93406d87 | 551 | |
d62a17ae | 552 | if (bgp_debug_neighbor_events(peer)) |
553 | zlog_debug("%s graceful restart stalepath timer expired", | |
554 | peer->host); | |
93406d87 | 555 | |
d62a17ae | 556 | /* NSF delete stale route */ |
557 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 558 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) |
d62a17ae | 559 | if (peer->nsf[afi][safi]) |
560 | bgp_clear_stale_route(peer, afi, safi); | |
93406d87 | 561 | |
d62a17ae | 562 | return 0; |
93406d87 | 563 | } |
564 | ||
d62a17ae | 565 | static int bgp_update_delay_applicable(struct bgp *bgp) |
f188f2c4 | 566 | { |
d62a17ae | 567 | /* update_delay_over flag should be reset (set to 0) for any new |
568 | applicability of the update-delay during BGP process lifetime. | |
569 | And it should be set after an occurence of the update-delay is | |
570 | over)*/ | |
571 | if (!bgp->update_delay_over) | |
572 | return 1; | |
573 | ||
574 | return 0; | |
f188f2c4 DS |
575 | } |
576 | ||
d62a17ae | 577 | int bgp_update_delay_active(struct bgp *bgp) |
f188f2c4 | 578 | { |
d62a17ae | 579 | if (bgp->t_update_delay) |
580 | return 1; | |
f188f2c4 | 581 | |
d62a17ae | 582 | return 0; |
f188f2c4 DS |
583 | } |
584 | ||
d62a17ae | 585 | int bgp_update_delay_configured(struct bgp *bgp) |
f188f2c4 | 586 | { |
d62a17ae | 587 | if (bgp->v_update_delay) |
588 | return 1; | |
f188f2c4 | 589 | |
d62a17ae | 590 | return 0; |
f188f2c4 DS |
591 | } |
592 | ||
593 | /* Do the post-processing needed when bgp comes out of the read-only mode | |
594 | on ending the update delay. */ | |
d62a17ae | 595 | void bgp_update_delay_end(struct bgp *bgp) |
f188f2c4 | 596 | { |
d62a17ae | 597 | THREAD_TIMER_OFF(bgp->t_update_delay); |
598 | THREAD_TIMER_OFF(bgp->t_establish_wait); | |
599 | ||
600 | /* Reset update-delay related state */ | |
601 | bgp->update_delay_over = 1; | |
602 | bgp->established = 0; | |
603 | bgp->restarted_peers = 0; | |
604 | bgp->implicit_eors = 0; | |
605 | bgp->explicit_eors = 0; | |
606 | ||
607 | quagga_timestamp(3, bgp->update_delay_end_time, | |
608 | sizeof(bgp->update_delay_end_time)); | |
609 | ||
610 | /* | |
611 | * Add an end-of-initial-update marker to the main process queues so | |
612 | * that | |
613 | * the route advertisement timer for the peers can be started. Also set | |
614 | * the zebra and peer update hold flags. These flags are used to achieve | |
615 | * three stages in the update-delay post processing: | |
616 | * 1. Finish best-path selection for all the prefixes held on the | |
617 | * queues. | |
618 | * (routes in BGP are updated, and peers sync queues are populated | |
619 | * too) | |
620 | * 2. As the eoiu mark is reached in the bgp process routine, ship all | |
621 | * the | |
622 | * routes to zebra. With that zebra should see updates from BGP | |
623 | * close | |
624 | * to each other. | |
625 | * 3. Unblock the peer update writes. With that peer update packing | |
626 | * with | |
627 | * the prefixes should be at its maximum. | |
628 | */ | |
629 | bgp_add_eoiu_mark(bgp); | |
630 | bgp->main_zebra_update_hold = 1; | |
631 | bgp->main_peers_update_hold = 1; | |
632 | ||
633 | /* Resume the queue processing. This should trigger the event that would | |
634 | take | |
635 | care of processing any work that was queued during the read-only | |
636 | mode. */ | |
637 | work_queue_unplug(bm->process_main_queue); | |
f188f2c4 DS |
638 | } |
639 | ||
cb1faec9 DS |
640 | /** |
641 | * see bgp_fsm.h | |
642 | */ | |
d62a17ae | 643 | void bgp_start_routeadv(struct bgp *bgp) |
cb1faec9 | 644 | { |
d62a17ae | 645 | struct listnode *node, *nnode; |
646 | struct peer *peer; | |
cb1faec9 | 647 | |
d62a17ae | 648 | zlog_info("bgp_start_routeadv(), update hold status %d", |
649 | bgp->main_peers_update_hold); | |
4a16ae86 | 650 | |
d62a17ae | 651 | if (bgp->main_peers_update_hold) |
652 | return; | |
4a16ae86 | 653 | |
d62a17ae | 654 | quagga_timestamp(3, bgp->update_delay_peers_resume_time, |
655 | sizeof(bgp->update_delay_peers_resume_time)); | |
4a16ae86 | 656 | |
d62a17ae | 657 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) { |
658 | if (peer->status != Established) | |
659 | continue; | |
660 | BGP_TIMER_OFF(peer->t_routeadv); | |
661 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
662 | } | |
cb1faec9 DS |
663 | } |
664 | ||
665 | /** | |
666 | * see bgp_fsm.h | |
667 | */ | |
d62a17ae | 668 | void bgp_adjust_routeadv(struct peer *peer) |
cb1faec9 | 669 | { |
d62a17ae | 670 | time_t nowtime = bgp_clock(); |
671 | double diff; | |
672 | unsigned long remain; | |
673 | ||
674 | /* Bypass checks for special case of MRAI being 0 */ | |
675 | if (peer->v_routeadv == 0) { | |
676 | /* Stop existing timer, just in case it is running for a | |
677 | * different | |
678 | * duration and schedule write thread immediately. | |
679 | */ | |
680 | if (peer->t_routeadv) | |
681 | BGP_TIMER_OFF(peer->t_routeadv); | |
682 | ||
683 | peer->synctime = bgp_clock(); | |
a9794991 | 684 | thread_add_timer_msec(bm->master, bgp_generate_updgrp_packets, |
424ab01d QY |
685 | peer, 0, |
686 | &peer->t_generate_updgrp_packets); | |
d62a17ae | 687 | return; |
688 | } | |
689 | ||
690 | ||
691 | /* | |
692 | * CASE I: | |
693 | * If the last update was written more than MRAI back, expire the timer | |
694 | * instantly so that we can send the update out sooner. | |
695 | * | |
696 | * <------- MRAI ---------> | |
697 | * |-----------------|-----------------------| | |
698 | * <------------- m ------------> | |
699 | * ^ ^ ^ | |
700 | * | | | | |
701 | * | | current time | |
702 | * | timer start | |
703 | * last write | |
704 | * | |
705 | * m > MRAI | |
706 | */ | |
707 | diff = difftime(nowtime, peer->last_update); | |
708 | if (diff > (double)peer->v_routeadv) { | |
709 | BGP_TIMER_OFF(peer->t_routeadv); | |
710 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
711 | return; | |
712 | } | |
713 | ||
714 | /* | |
715 | * CASE II: | |
716 | * - Find when to expire the MRAI timer. | |
717 | * If MRAI timer is not active, assume we can start it now. | |
718 | * | |
719 | * <------- MRAI ---------> | |
720 | * |------------|-----------------------| | |
721 | * <-------- m ----------><----- r -----> | |
722 | * ^ ^ ^ | |
723 | * | | | | |
724 | * | | current time | |
725 | * | timer start | |
726 | * last write | |
727 | * | |
728 | * (MRAI - m) < r | |
729 | */ | |
730 | if (peer->t_routeadv) | |
731 | remain = thread_timer_remain_second(peer->t_routeadv); | |
732 | else | |
733 | remain = peer->v_routeadv; | |
734 | diff = peer->v_routeadv - diff; | |
735 | if (diff <= (double)remain) { | |
736 | BGP_TIMER_OFF(peer->t_routeadv); | |
737 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, diff); | |
738 | } | |
cb1faec9 DS |
739 | } |
740 | ||
d62a17ae | 741 | static int bgp_maxmed_onstartup_applicable(struct bgp *bgp) |
abc920f8 | 742 | { |
d62a17ae | 743 | if (!bgp->maxmed_onstartup_over) |
744 | return 1; | |
abc920f8 | 745 | |
d62a17ae | 746 | return 0; |
abc920f8 DS |
747 | } |
748 | ||
d62a17ae | 749 | int bgp_maxmed_onstartup_configured(struct bgp *bgp) |
abc920f8 | 750 | { |
d62a17ae | 751 | if (bgp->v_maxmed_onstartup != BGP_MAXMED_ONSTARTUP_UNCONFIGURED) |
752 | return 1; | |
abc920f8 | 753 | |
d62a17ae | 754 | return 0; |
abc920f8 DS |
755 | } |
756 | ||
d62a17ae | 757 | int bgp_maxmed_onstartup_active(struct bgp *bgp) |
abc920f8 | 758 | { |
d62a17ae | 759 | if (bgp->t_maxmed_onstartup) |
760 | return 1; | |
abc920f8 | 761 | |
d62a17ae | 762 | return 0; |
abc920f8 DS |
763 | } |
764 | ||
d62a17ae | 765 | void bgp_maxmed_update(struct bgp *bgp) |
abc920f8 | 766 | { |
d7c0a89a QY |
767 | uint8_t maxmed_active; |
768 | uint32_t maxmed_value; | |
d62a17ae | 769 | |
770 | if (bgp->v_maxmed_admin) { | |
771 | maxmed_active = 1; | |
772 | maxmed_value = bgp->maxmed_admin_value; | |
773 | } else if (bgp->t_maxmed_onstartup) { | |
774 | maxmed_active = 1; | |
775 | maxmed_value = bgp->maxmed_onstartup_value; | |
776 | } else { | |
777 | maxmed_active = 0; | |
778 | maxmed_value = BGP_MAXMED_VALUE_DEFAULT; | |
779 | } | |
780 | ||
781 | if (bgp->maxmed_active != maxmed_active | |
782 | || bgp->maxmed_value != maxmed_value) { | |
783 | bgp->maxmed_active = maxmed_active; | |
784 | bgp->maxmed_value = maxmed_value; | |
785 | ||
786 | update_group_announce(bgp); | |
787 | } | |
abc920f8 DS |
788 | } |
789 | ||
790 | /* The maxmed onstartup timer expiry callback. */ | |
d62a17ae | 791 | static int bgp_maxmed_onstartup_timer(struct thread *thread) |
abc920f8 | 792 | { |
d62a17ae | 793 | struct bgp *bgp; |
abc920f8 | 794 | |
d62a17ae | 795 | zlog_info("Max med on startup ended - timer expired."); |
abc920f8 | 796 | |
d62a17ae | 797 | bgp = THREAD_ARG(thread); |
798 | THREAD_TIMER_OFF(bgp->t_maxmed_onstartup); | |
799 | bgp->maxmed_onstartup_over = 1; | |
abc920f8 | 800 | |
d62a17ae | 801 | bgp_maxmed_update(bgp); |
abc920f8 | 802 | |
d62a17ae | 803 | return 0; |
abc920f8 DS |
804 | } |
805 | ||
d62a17ae | 806 | static void bgp_maxmed_onstartup_begin(struct bgp *bgp) |
abc920f8 | 807 | { |
d62a17ae | 808 | /* Applicable only once in the process lifetime on the startup */ |
809 | if (bgp->maxmed_onstartup_over) | |
810 | return; | |
abc920f8 | 811 | |
d62a17ae | 812 | zlog_info("Begin maxmed onstartup mode - timer %d seconds", |
813 | bgp->v_maxmed_onstartup); | |
abc920f8 | 814 | |
d62a17ae | 815 | thread_add_timer(bm->master, bgp_maxmed_onstartup_timer, bgp, |
816 | bgp->v_maxmed_onstartup, &bgp->t_maxmed_onstartup); | |
abc920f8 | 817 | |
d62a17ae | 818 | if (!bgp->v_maxmed_admin) { |
819 | bgp->maxmed_active = 1; | |
820 | bgp->maxmed_value = bgp->maxmed_onstartup_value; | |
821 | } | |
abc920f8 | 822 | |
d62a17ae | 823 | /* Route announce to all peers should happen after this in |
824 | * bgp_establish() */ | |
abc920f8 DS |
825 | } |
826 | ||
d62a17ae | 827 | static void bgp_maxmed_onstartup_process_status_change(struct peer *peer) |
abc920f8 | 828 | { |
d62a17ae | 829 | if (peer->status == Established && !peer->bgp->established) { |
830 | bgp_maxmed_onstartup_begin(peer->bgp); | |
831 | } | |
abc920f8 DS |
832 | } |
833 | ||
f188f2c4 | 834 | /* The update delay timer expiry callback. */ |
d62a17ae | 835 | static int bgp_update_delay_timer(struct thread *thread) |
f188f2c4 | 836 | { |
d62a17ae | 837 | struct bgp *bgp; |
f188f2c4 | 838 | |
d62a17ae | 839 | zlog_info("Update delay ended - timer expired."); |
f188f2c4 | 840 | |
d62a17ae | 841 | bgp = THREAD_ARG(thread); |
842 | THREAD_TIMER_OFF(bgp->t_update_delay); | |
843 | bgp_update_delay_end(bgp); | |
f188f2c4 | 844 | |
d62a17ae | 845 | return 0; |
f188f2c4 DS |
846 | } |
847 | ||
848 | /* The establish wait timer expiry callback. */ | |
d62a17ae | 849 | static int bgp_establish_wait_timer(struct thread *thread) |
f188f2c4 | 850 | { |
d62a17ae | 851 | struct bgp *bgp; |
f188f2c4 | 852 | |
d62a17ae | 853 | zlog_info("Establish wait - timer expired."); |
f188f2c4 | 854 | |
d62a17ae | 855 | bgp = THREAD_ARG(thread); |
856 | THREAD_TIMER_OFF(bgp->t_establish_wait); | |
857 | bgp_check_update_delay(bgp); | |
f188f2c4 | 858 | |
d62a17ae | 859 | return 0; |
f188f2c4 DS |
860 | } |
861 | ||
862 | /* Steps to begin the update delay: | |
863 | - initialize queues if needed | |
864 | - stop the queue processing | |
865 | - start the timer */ | |
d62a17ae | 866 | static void bgp_update_delay_begin(struct bgp *bgp) |
f188f2c4 | 867 | { |
d62a17ae | 868 | struct listnode *node, *nnode; |
869 | struct peer *peer; | |
f188f2c4 | 870 | |
d62a17ae | 871 | /* Stop the processing of queued work. Enqueue shall continue */ |
872 | work_queue_plug(bm->process_main_queue); | |
f188f2c4 | 873 | |
d62a17ae | 874 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) |
875 | peer->update_delay_over = 0; | |
f188f2c4 | 876 | |
d62a17ae | 877 | /* Start the update-delay timer */ |
878 | thread_add_timer(bm->master, bgp_update_delay_timer, bgp, | |
879 | bgp->v_update_delay, &bgp->t_update_delay); | |
f188f2c4 | 880 | |
d62a17ae | 881 | if (bgp->v_establish_wait != bgp->v_update_delay) |
882 | thread_add_timer(bm->master, bgp_establish_wait_timer, bgp, | |
883 | bgp->v_establish_wait, &bgp->t_establish_wait); | |
f188f2c4 | 884 | |
d62a17ae | 885 | quagga_timestamp(3, bgp->update_delay_begin_time, |
886 | sizeof(bgp->update_delay_begin_time)); | |
f188f2c4 DS |
887 | } |
888 | ||
d62a17ae | 889 | static void bgp_update_delay_process_status_change(struct peer *peer) |
f188f2c4 | 890 | { |
d62a17ae | 891 | if (peer->status == Established) { |
892 | if (!peer->bgp->established++) { | |
893 | bgp_update_delay_begin(peer->bgp); | |
894 | zlog_info( | |
895 | "Begin read-only mode - update-delay timer %d seconds", | |
896 | peer->bgp->v_update_delay); | |
897 | } | |
898 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_BIT_RCV)) | |
899 | bgp_update_restarted_peers(peer); | |
900 | } | |
901 | if (peer->ostatus == Established | |
902 | && bgp_update_delay_active(peer->bgp)) { | |
903 | /* Adjust the update-delay state to account for this flap. | |
904 | NOTE: Intentionally skipping adjusting implicit_eors or | |
905 | explicit_eors | |
906 | counters. Extra sanity check in bgp_check_update_delay() | |
907 | should | |
908 | be enough to take care of any additive discrepancy in bgp eor | |
909 | counters */ | |
910 | peer->bgp->established--; | |
911 | peer->update_delay_over = 0; | |
912 | } | |
f188f2c4 DS |
913 | } |
914 | ||
200df115 | 915 | /* Called after event occured, this function change status and reset |
916 | read/write and timer thread. */ | |
d62a17ae | 917 | void bgp_fsm_change_status(struct peer *peer, int status) |
200df115 | 918 | { |
1ff9a340 | 919 | |
d62a17ae | 920 | bgp_dump_state(peer, peer->status, status); |
921 | ||
922 | /* Transition into Clearing or Deleted must /always/ clear all routes.. | |
923 | * (and must do so before actually changing into Deleted.. | |
924 | */ | |
925 | if (status >= Clearing) { | |
926 | bgp_clear_route_all(peer); | |
927 | ||
928 | /* If no route was queued for the clear-node processing, | |
929 | * generate the | |
930 | * completion event here. This is needed because if there are no | |
931 | * routes | |
932 | * to trigger the background clear-node thread, the event won't | |
933 | * get | |
934 | * generated and the peer would be stuck in Clearing. Note that | |
935 | * this | |
936 | * event is for the peer and helps the peer transition out of | |
937 | * Clearing | |
938 | * state; it should not be generated per (AFI,SAFI). The event | |
939 | * is | |
940 | * directly posted here without calling clear_node_complete() as | |
941 | * we | |
942 | * shouldn't do an extra unlock. This event will get processed | |
943 | * after | |
944 | * the state change that happens below, so peer will be in | |
945 | * Clearing | |
946 | * (or Deleted). | |
947 | */ | |
948 | if (!work_queue_is_scheduled(peer->clear_node_queue)) | |
949 | BGP_EVENT_ADD(peer, Clearing_Completed); | |
950 | } | |
951 | ||
952 | /* Preserve old status and change into new status. */ | |
953 | peer->ostatus = peer->status; | |
954 | peer->status = status; | |
955 | ||
956 | /* Save event that caused status change. */ | |
957 | peer->last_major_event = peer->cur_event; | |
958 | ||
959 | if (status == Established) | |
960 | UNSET_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER); | |
961 | ||
962 | /* If max-med processing is applicable, do the necessary. */ | |
963 | if (status == Established) { | |
964 | if (bgp_maxmed_onstartup_configured(peer->bgp) | |
965 | && bgp_maxmed_onstartup_applicable(peer->bgp)) | |
966 | bgp_maxmed_onstartup_process_status_change(peer); | |
967 | else | |
968 | peer->bgp->maxmed_onstartup_over = 1; | |
969 | } | |
970 | ||
971 | /* If update-delay processing is applicable, do the necessary. */ | |
972 | if (bgp_update_delay_configured(peer->bgp) | |
973 | && bgp_update_delay_applicable(peer->bgp)) | |
974 | bgp_update_delay_process_status_change(peer); | |
975 | ||
976 | if (bgp_debug_neighbor_events(peer)) | |
977 | zlog_debug("%s went from %s to %s", peer->host, | |
978 | lookup_msg(bgp_status_msg, peer->ostatus, NULL), | |
979 | lookup_msg(bgp_status_msg, peer->status, NULL)); | |
200df115 | 980 | } |
981 | ||
3117b5c4 | 982 | /* Flush the event queue and ensure the peer is shut down */ |
d62a17ae | 983 | static int bgp_clearing_completed(struct peer *peer) |
3117b5c4 | 984 | { |
d62a17ae | 985 | int rc = bgp_stop(peer); |
1ff9a340 | 986 | |
d62a17ae | 987 | if (rc >= 0) |
988 | BGP_EVENT_FLUSH(peer); | |
3117b5c4 | 989 | |
d62a17ae | 990 | return rc; |
3117b5c4 SH |
991 | } |
992 | ||
718e3744 | 993 | /* Administrative BGP peer stop event. */ |
3117b5c4 | 994 | /* May be called multiple times for the same peer */ |
d62a17ae | 995 | int bgp_stop(struct peer *peer) |
718e3744 | 996 | { |
d62a17ae | 997 | afi_t afi; |
998 | safi_t safi; | |
999 | char orf_name[BUFSIZ]; | |
1000 | int ret = 0; | |
1001 | ||
1002 | if (peer_dynamic_neighbor(peer) | |
1003 | && !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
1004 | if (bgp_debug_neighbor_events(peer)) | |
1005 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1006 | peer_delete(peer); | |
1007 | return -1; | |
c22767d8 | 1008 | } |
848973c7 | 1009 | |
d62a17ae | 1010 | /* Can't do this in Clearing; events are used for state transitions */ |
1011 | if (peer->status != Clearing) { | |
1012 | /* Delete all existing events of the peer */ | |
1013 | BGP_EVENT_FLUSH(peer); | |
93406d87 | 1014 | } |
d62a17ae | 1015 | |
1016 | /* Increment Dropped count. */ | |
1017 | if (peer->status == Established) { | |
1018 | peer->dropped++; | |
1019 | ||
1020 | /* bgp log-neighbor-changes of neighbor Down */ | |
1021 | if (bgp_flag_check(peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { | |
1022 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); | |
1023 | zlog_info( | |
1024 | "%%ADJCHANGE: neighbor %s(%s) in vrf %s Down %s", | |
1025 | peer->host, | |
1026 | (peer->hostname) ? peer->hostname : "Unknown", | |
1027 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) ? vrf->name | |
1028 | : "Default") | |
1029 | : "", | |
1030 | peer_down_str[(int)peer->last_reset]); | |
1031 | } | |
1032 | ||
1033 | /* graceful restart */ | |
1034 | if (peer->t_gr_stale) { | |
1035 | BGP_TIMER_OFF(peer->t_gr_stale); | |
1036 | if (bgp_debug_neighbor_events(peer)) | |
1037 | zlog_debug( | |
1038 | "%s graceful restart stalepath timer stopped", | |
1039 | peer->host); | |
1040 | } | |
1041 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
1042 | if (bgp_debug_neighbor_events(peer)) { | |
1043 | zlog_debug( | |
1044 | "%s graceful restart timer started for %d sec", | |
1045 | peer->host, peer->v_gr_restart); | |
1046 | zlog_debug( | |
1047 | "%s graceful restart stalepath timer started for %d sec", | |
1048 | peer->host, peer->bgp->stalepath_time); | |
1049 | } | |
1050 | BGP_TIMER_ON(peer->t_gr_restart, | |
1051 | bgp_graceful_restart_timer_expire, | |
1052 | peer->v_gr_restart); | |
1053 | BGP_TIMER_ON(peer->t_gr_stale, | |
1054 | bgp_graceful_stale_timer_expire, | |
1055 | peer->bgp->stalepath_time); | |
1056 | } else { | |
1057 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1058 | ||
1059 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
996c9314 LB |
1060 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; |
1061 | safi++) | |
d62a17ae | 1062 | peer->nsf[afi][safi] = 0; |
1063 | } | |
1064 | ||
1065 | /* set last reset time */ | |
1066 | peer->resettime = peer->uptime = bgp_clock(); | |
1067 | ||
1068 | if (BGP_DEBUG(update_groups, UPDATE_GROUPS)) | |
1069 | zlog_debug("%s remove from all update group", | |
1070 | peer->host); | |
1071 | update_group_remove_peer_afs(peer); | |
1072 | ||
1073 | hook_call(peer_backward_transition, peer); | |
1074 | ||
1075 | /* Reset peer synctime */ | |
1076 | peer->synctime = 0; | |
1077 | ||
1078 | bgp_bfd_deregister_peer(peer); | |
93406d87 | 1079 | } |
93406d87 | 1080 | |
424ab01d | 1081 | /* stop keepalives */ |
b72b6f4f | 1082 | bgp_keepalives_off(peer); |
424ab01d QY |
1083 | |
1084 | /* Stop read and write threads. */ | |
1085 | bgp_writes_off(peer); | |
1086 | bgp_reads_off(peer); | |
1087 | ||
387f984e QY |
1088 | THREAD_OFF(peer->t_connect_check_r); |
1089 | THREAD_OFF(peer->t_connect_check_w); | |
d62a17ae | 1090 | |
1091 | /* Stop all timers. */ | |
1092 | BGP_TIMER_OFF(peer->t_start); | |
1093 | BGP_TIMER_OFF(peer->t_connect); | |
1094 | BGP_TIMER_OFF(peer->t_holdtime); | |
d62a17ae | 1095 | BGP_TIMER_OFF(peer->t_routeadv); |
d62a17ae | 1096 | |
1097 | /* Clear input and output buffer. */ | |
424ab01d | 1098 | pthread_mutex_lock(&peer->io_mtx); |
d3ecc69e | 1099 | { |
424ab01d QY |
1100 | if (peer->ibuf) |
1101 | stream_fifo_clean(peer->ibuf); | |
d3ecc69e QY |
1102 | if (peer->obuf) |
1103 | stream_fifo_clean(peer->obuf); | |
424ab01d QY |
1104 | |
1105 | if (peer->ibuf_work) | |
74ffbfe6 | 1106 | ringbuf_wipe(peer->ibuf_work); |
424ab01d QY |
1107 | if (peer->obuf_work) |
1108 | stream_reset(peer->obuf_work); | |
1109 | ||
1110 | if (peer->curr) { | |
1111 | stream_free(peer->curr); | |
1112 | peer->curr = NULL; | |
1113 | } | |
d3ecc69e | 1114 | } |
424ab01d | 1115 | pthread_mutex_unlock(&peer->io_mtx); |
d62a17ae | 1116 | |
1117 | /* Close of file descriptor. */ | |
1118 | if (peer->fd >= 0) { | |
1119 | close(peer->fd); | |
1120 | peer->fd = -1; | |
93406d87 | 1121 | } |
1122 | ||
05c7a1cc QY |
1123 | FOREACH_AFI_SAFI (afi, safi) { |
1124 | /* Reset all negotiated variables */ | |
1125 | peer->afc_nego[afi][safi] = 0; | |
1126 | peer->afc_adv[afi][safi] = 0; | |
1127 | peer->afc_recv[afi][safi] = 0; | |
1128 | ||
1129 | /* peer address family capability flags*/ | |
1130 | peer->af_cap[afi][safi] = 0; | |
1131 | ||
1132 | /* peer address family status flags*/ | |
1133 | peer->af_sflags[afi][safi] = 0; | |
1134 | ||
1135 | /* Received ORF prefix-filter */ | |
1136 | peer->orf_plist[afi][safi] = NULL; | |
1137 | ||
1138 | if ((peer->status == OpenConfirm) | |
1139 | || (peer->status == Established)) { | |
1140 | /* ORF received prefix-filter pnt */ | |
1141 | sprintf(orf_name, "%s.%d.%d", peer->host, afi, safi); | |
1142 | prefix_bgp_orf_remove_all(afi, orf_name); | |
d62a17ae | 1143 | } |
05c7a1cc | 1144 | } |
d62a17ae | 1145 | |
1146 | /* Reset keepalive and holdtime */ | |
d25e4efc | 1147 | if (PEER_OR_GROUP_TIMER_SET(peer)) { |
d62a17ae | 1148 | peer->v_keepalive = peer->keepalive; |
1149 | peer->v_holdtime = peer->holdtime; | |
1150 | } else { | |
1151 | peer->v_keepalive = peer->bgp->default_keepalive; | |
1152 | peer->v_holdtime = peer->bgp->default_holdtime; | |
1ff9a340 | 1153 | } |
d62a17ae | 1154 | |
1155 | peer->update_time = 0; | |
1156 | ||
1157 | /* Until we are sure that there is no problem about prefix count | |
1158 | this should be commented out.*/ | |
718e3744 | 1159 | #if 0 |
1160 | /* Reset prefix count */ | |
1161 | peer->pcount[AFI_IP][SAFI_UNICAST] = 0; | |
1162 | peer->pcount[AFI_IP][SAFI_MULTICAST] = 0; | |
cd1964ff | 1163 | peer->pcount[AFI_IP][SAFI_LABELED_UNICAST] = 0; |
718e3744 | 1164 | peer->pcount[AFI_IP][SAFI_MPLS_VPN] = 0; |
1165 | peer->pcount[AFI_IP6][SAFI_UNICAST] = 0; | |
1166 | peer->pcount[AFI_IP6][SAFI_MULTICAST] = 0; | |
cd1964ff | 1167 | peer->pcount[AFI_IP6][SAFI_LABELED_UNICAST] = 0; |
718e3744 | 1168 | #endif /* 0 */ |
1169 | ||
d62a17ae | 1170 | if (!CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE) |
1171 | && !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
1172 | peer_delete(peer); | |
1173 | ret = -1; | |
1174 | } else { | |
1175 | bgp_peer_conf_if_to_su_update(peer); | |
1176 | } | |
1177 | ||
1178 | return ret; | |
718e3744 | 1179 | } |
1180 | ||
1181 | /* BGP peer is stoped by the error. */ | |
d62a17ae | 1182 | static int bgp_stop_with_error(struct peer *peer) |
718e3744 | 1183 | { |
d62a17ae | 1184 | /* Double start timer. */ |
1185 | peer->v_start *= 2; | |
1186 | ||
1187 | /* Overflow check. */ | |
1188 | if (peer->v_start >= (60 * 2)) | |
1189 | peer->v_start = (60 * 2); | |
1190 | ||
1191 | if (peer_dynamic_neighbor(peer)) { | |
1192 | if (bgp_debug_neighbor_events(peer)) | |
1193 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1194 | peer_delete(peer); | |
1195 | return -1; | |
1196 | } | |
1197 | ||
1198 | return (bgp_stop(peer)); | |
718e3744 | 1199 | } |
1200 | ||
397b5bde LR |
1201 | |
1202 | /* something went wrong, send notify and tear down */ | |
d7c0a89a QY |
1203 | static int bgp_stop_with_notify(struct peer *peer, uint8_t code, |
1204 | uint8_t sub_code) | |
397b5bde | 1205 | { |
d62a17ae | 1206 | /* Send notify to remote peer */ |
1207 | bgp_notify_send(peer, code, sub_code); | |
1208 | ||
1209 | if (peer_dynamic_neighbor(peer)) { | |
1210 | if (bgp_debug_neighbor_events(peer)) | |
1211 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1212 | peer_delete(peer); | |
1213 | return -1; | |
1214 | } | |
f14e6fdb | 1215 | |
d62a17ae | 1216 | /* Clear start timer value to default. */ |
1217 | peer->v_start = BGP_INIT_START_TIMER; | |
397b5bde | 1218 | |
d62a17ae | 1219 | return (bgp_stop(peer)); |
397b5bde LR |
1220 | } |
1221 | ||
07a16526 QY |
1222 | /** |
1223 | * Determines whether a TCP session has successfully established for a peer and | |
1224 | * events as appropriate. | |
1225 | * | |
1226 | * This function is called when setting up a new session. After connect() is | |
387f984e QY |
1227 | * called on the peer's socket (in bgp_start()), the fd is passed to poll() |
1228 | * to wait for connection success or failure. When poll() returns, this | |
07a16526 | 1229 | * function is called to evaluate the result. |
387f984e QY |
1230 | * |
1231 | * Due to differences in behavior of poll() on Linux and BSD - specifically, | |
1232 | * the value of .revents in the case of a closed connection - this function is | |
1233 | * scheduled both for a read and a write event. The write event is triggered | |
1234 | * when the connection is established. A read event is triggered when the | |
1235 | * connection is closed. Thus we need to cancel whichever one did not occur. | |
07a16526 QY |
1236 | */ |
1237 | static int bgp_connect_check(struct thread *thread) | |
1238 | { | |
1239 | int status; | |
1240 | socklen_t slen; | |
1241 | int ret; | |
1242 | struct peer *peer; | |
1243 | ||
1244 | peer = THREAD_ARG(thread); | |
424ab01d QY |
1245 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); |
1246 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); | |
1247 | assert(!peer->t_read); | |
1248 | assert(!peer->t_write); | |
07a16526 | 1249 | |
387f984e QY |
1250 | THREAD_OFF(peer->t_connect_check_r); |
1251 | THREAD_OFF(peer->t_connect_check_w); | |
dc1188bb | 1252 | |
07a16526 QY |
1253 | /* Check file descriptor. */ |
1254 | slen = sizeof(status); | |
1255 | ret = getsockopt(peer->fd, SOL_SOCKET, SO_ERROR, (void *)&status, | |
1256 | &slen); | |
1257 | ||
1258 | /* If getsockopt is fail, this is fatal error. */ | |
1259 | if (ret < 0) { | |
54ff5e9b DS |
1260 | zlog_info("can't get sockopt for nonblocking connect: %d(%s)", |
1261 | errno, safe_strerror(errno)); | |
07a16526 QY |
1262 | BGP_EVENT_ADD(peer, TCP_fatal_error); |
1263 | return -1; | |
1264 | } | |
1265 | ||
1266 | /* When status is 0 then TCP connection is established. */ | |
1267 | if (status == 0) { | |
1268 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
1269 | return 1; | |
1270 | } else { | |
1271 | if (bgp_debug_neighbor_events(peer)) | |
54ff5e9b DS |
1272 | zlog_debug("%s [Event] Connect failed %d(%s)", |
1273 | peer->host, status, safe_strerror(status)); | |
07a16526 QY |
1274 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); |
1275 | return 0; | |
1276 | } | |
1277 | } | |
397b5bde | 1278 | |
718e3744 | 1279 | /* TCP connection open. Next we send open message to remote peer. And |
1280 | add read thread for reading open message. */ | |
d62a17ae | 1281 | static int bgp_connect_success(struct peer *peer) |
718e3744 | 1282 | { |
d62a17ae | 1283 | if (peer->fd < 0) { |
1284 | zlog_err("bgp_connect_success peer's fd is negative value %d", | |
1285 | peer->fd); | |
1286 | bgp_stop(peer); | |
1287 | return -1; | |
1288 | } | |
1289 | ||
1290 | if (bgp_getsockname(peer) < 0) { | |
1291 | zlog_err("%s: bgp_getsockname(): failed for peer %s, fd %d", | |
1292 | __FUNCTION__, peer->host, peer->fd); | |
1293 | bgp_notify_send(peer, BGP_NOTIFY_FSM_ERR, | |
1294 | 0); /* internal error */ | |
424ab01d | 1295 | bgp_writes_on(peer); |
d62a17ae | 1296 | return -1; |
1297 | } | |
1298 | ||
424ab01d | 1299 | bgp_reads_on(peer); |
d62a17ae | 1300 | |
1301 | if (bgp_debug_neighbor_events(peer)) { | |
1302 | char buf1[SU_ADDRSTRLEN]; | |
1303 | ||
1304 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) | |
1305 | zlog_debug("%s open active, local address %s", | |
1306 | peer->host, | |
1307 | sockunion2str(peer->su_local, buf1, | |
1308 | SU_ADDRSTRLEN)); | |
1309 | else | |
1310 | zlog_debug("%s passive open", peer->host); | |
1311 | } | |
1312 | ||
1313 | bgp_open_send(peer); | |
1314 | ||
1315 | return 0; | |
718e3744 | 1316 | } |
1317 | ||
1318 | /* TCP connect fail */ | |
d62a17ae | 1319 | static int bgp_connect_fail(struct peer *peer) |
718e3744 | 1320 | { |
d62a17ae | 1321 | if (peer_dynamic_neighbor(peer)) { |
1322 | if (bgp_debug_neighbor_events(peer)) | |
1323 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1324 | peer_delete(peer); | |
1325 | return -1; | |
1326 | } | |
1327 | ||
1328 | return (bgp_stop(peer)); | |
718e3744 | 1329 | } |
1330 | ||
1331 | /* This function is the first starting point of all BGP connection. It | |
1332 | try to connect to remote peer with non-blocking IO. */ | |
d62a17ae | 1333 | int bgp_start(struct peer *peer) |
718e3744 | 1334 | { |
d62a17ae | 1335 | int status; |
1336 | int connected = 0; | |
1337 | ||
1338 | bgp_peer_conf_if_to_su_update(peer); | |
1339 | ||
1340 | if (peer->su.sa.sa_family == AF_UNSPEC) { | |
1341 | if (bgp_debug_neighbor_events(peer)) | |
1342 | zlog_debug( | |
1343 | "%s [FSM] Unable to get neighbor's IP address, waiting...", | |
1344 | peer->host); | |
1345 | return -1; | |
1346 | } | |
1347 | ||
1348 | if (BGP_PEER_START_SUPPRESSED(peer)) { | |
1349 | if (bgp_debug_neighbor_events(peer)) | |
1350 | zlog_err( | |
1351 | "%s [FSM] Trying to start suppressed peer" | |
1352 | " - this is never supposed to happen!", | |
1353 | peer->host); | |
1354 | return -1; | |
1355 | } | |
1356 | ||
1357 | /* Scrub some information that might be left over from a previous, | |
1358 | * session | |
1359 | */ | |
1360 | /* Connection information. */ | |
1361 | if (peer->su_local) { | |
1362 | sockunion_free(peer->su_local); | |
1363 | peer->su_local = NULL; | |
1364 | } | |
1365 | ||
1366 | if (peer->su_remote) { | |
1367 | sockunion_free(peer->su_remote); | |
1368 | peer->su_remote = NULL; | |
1369 | } | |
1370 | ||
1371 | /* Clear remote router-id. */ | |
1372 | peer->remote_id.s_addr = 0; | |
1373 | ||
1374 | /* Clear peer capability flag. */ | |
1375 | peer->cap = 0; | |
1376 | ||
1377 | /* If the peer is passive mode, force to move to Active mode. */ | |
1378 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE)) { | |
1379 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1380 | return 0; | |
1381 | } | |
1382 | ||
5410015a | 1383 | if (peer->bgp->vrf_id == VRF_UNKNOWN) { |
61cf4b37 PG |
1384 | if (bgp_debug_neighbor_events(peer)) |
1385 | zlog_err( | |
996c9314 LB |
1386 | "%s [FSM] In a VRF that is not initialised yet", |
1387 | peer->host); | |
61cf4b37 PG |
1388 | return -1; |
1389 | } | |
1390 | ||
d62a17ae | 1391 | /* Register to be notified on peer up */ |
1392 | if (peer->sort == BGP_PEER_EBGP && peer->ttl == 1 | |
1393 | && !CHECK_FLAG(peer->flags, PEER_FLAG_DISABLE_CONNECTED_CHECK) | |
1394 | && !bgp_flag_check(peer->bgp, BGP_FLAG_DISABLE_NH_CONNECTED_CHK)) | |
1395 | connected = 1; | |
1396 | else | |
1397 | connected = 0; | |
1398 | ||
960035b2 | 1399 | if (!bgp_find_or_add_nexthop(peer->bgp, peer->bgp, |
d62a17ae | 1400 | family2afi(peer->su.sa.sa_family), NULL, |
1401 | peer, connected)) { | |
c42eab4b DS |
1402 | if (bgp_zebra_num_connects()) { |
1403 | if (bgp_debug_neighbor_events(peer)) | |
1404 | zlog_debug("%s [FSM] Waiting for NHT", | |
1405 | peer->host); | |
d62a17ae | 1406 | |
c42eab4b DS |
1407 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); |
1408 | return 0; | |
1409 | } | |
718e3744 | 1410 | } |
d62a17ae | 1411 | |
424ab01d QY |
1412 | assert(!peer->t_write); |
1413 | assert(!peer->t_read); | |
1414 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); | |
1415 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); | |
d62a17ae | 1416 | status = bgp_connect(peer); |
1417 | ||
1418 | switch (status) { | |
1419 | case connect_error: | |
1420 | if (bgp_debug_neighbor_events(peer)) | |
1421 | zlog_debug("%s [FSM] Connect error", peer->host); | |
1422 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1423 | break; | |
1424 | case connect_success: | |
1425 | if (bgp_debug_neighbor_events(peer)) | |
1426 | zlog_debug( | |
1427 | "%s [FSM] Connect immediately success, fd %d", | |
1428 | peer->host, peer->fd); | |
1429 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
1430 | break; | |
1431 | case connect_in_progress: | |
1432 | /* To check nonblocking connect, we wait until socket is | |
1433 | readable or writable. */ | |
1434 | if (bgp_debug_neighbor_events(peer)) | |
1435 | zlog_debug( | |
1436 | "%s [FSM] Non blocking connect waiting result, fd %d", | |
1437 | peer->host, peer->fd); | |
1438 | if (peer->fd < 0) { | |
1439 | zlog_err("bgp_start peer's fd is negative value %d", | |
1440 | peer->fd); | |
1441 | return -1; | |
1442 | } | |
becedef6 | 1443 | /* |
387f984e QY |
1444 | * - when the socket becomes ready, poll() will signify POLLOUT |
1445 | * - if it fails to connect, poll() will signify POLLHUP | |
1446 | * - POLLHUP is handled as a 'read' event by thread.c | |
1447 | * | |
1448 | * therefore, we schedule both a read and a write event with | |
1449 | * bgp_connect_check() as the handler for each and cancel the | |
1450 | * unused event in that function. | |
becedef6 | 1451 | */ |
424ab01d | 1452 | thread_add_read(bm->master, bgp_connect_check, peer, peer->fd, |
387f984e QY |
1453 | &peer->t_connect_check_r); |
1454 | thread_add_write(bm->master, bgp_connect_check, peer, peer->fd, | |
1455 | &peer->t_connect_check_w); | |
d62a17ae | 1456 | break; |
1457 | } | |
1458 | return 0; | |
718e3744 | 1459 | } |
1460 | ||
1461 | /* Connect retry timer is expired when the peer status is Connect. */ | |
d62a17ae | 1462 | static int bgp_reconnect(struct peer *peer) |
718e3744 | 1463 | { |
d62a17ae | 1464 | if (bgp_stop(peer) < 0) |
1465 | return -1; | |
1ff9a340 | 1466 | |
d62a17ae | 1467 | bgp_start(peer); |
1468 | return 0; | |
718e3744 | 1469 | } |
1470 | ||
d62a17ae | 1471 | static int bgp_fsm_open(struct peer *peer) |
718e3744 | 1472 | { |
d62a17ae | 1473 | /* Send keepalive and make keepalive timer */ |
1474 | bgp_keepalive_send(peer); | |
718e3744 | 1475 | |
d62a17ae | 1476 | /* Reset holdtimer value. */ |
1477 | BGP_TIMER_OFF(peer->t_holdtime); | |
718e3744 | 1478 | |
d62a17ae | 1479 | return 0; |
718e3744 | 1480 | } |
1481 | ||
397b5bde LR |
1482 | /* FSM error, unexpected event. This is error of BGP connection. So cut the |
1483 | peer and change to Idle status. */ | |
d62a17ae | 1484 | static int bgp_fsm_event_error(struct peer *peer) |
397b5bde | 1485 | { |
d62a17ae | 1486 | zlog_err("%s [FSM] unexpected packet received in state %s", peer->host, |
1487 | lookup_msg(bgp_status_msg, peer->status, NULL)); | |
397b5bde | 1488 | |
d62a17ae | 1489 | return bgp_stop_with_notify(peer, BGP_NOTIFY_FSM_ERR, 0); |
397b5bde LR |
1490 | } |
1491 | ||
718e3744 | 1492 | /* Hold timer expire. This is error of BGP connection. So cut the |
1493 | peer and change to Idle status. */ | |
d62a17ae | 1494 | static int bgp_fsm_holdtime_expire(struct peer *peer) |
718e3744 | 1495 | { |
d62a17ae | 1496 | if (bgp_debug_neighbor_events(peer)) |
1497 | zlog_debug("%s [FSM] Hold timer expire", peer->host); | |
718e3744 | 1498 | |
d62a17ae | 1499 | return bgp_stop_with_notify(peer, BGP_NOTIFY_HOLD_ERR, 0); |
718e3744 | 1500 | } |
1501 | ||
727c4f87 QY |
1502 | /** |
1503 | * Transition to Established state. | |
1504 | * | |
1505 | * Convert peer from stub to full fledged peer, set some timers, and generate | |
1506 | * initial updates. | |
1507 | */ | |
d62a17ae | 1508 | static int bgp_establish(struct peer *peer) |
718e3744 | 1509 | { |
d62a17ae | 1510 | afi_t afi; |
1511 | safi_t safi; | |
1512 | int nsf_af_count = 0; | |
1513 | int ret = 0; | |
1514 | struct peer *other; | |
1515 | ||
1516 | other = peer->doppelganger; | |
1517 | peer = peer_xfer_conn(peer); | |
1518 | if (!peer) { | |
1519 | zlog_err("%%Neighbor failed in xfer_conn"); | |
1520 | return -1; | |
93406d87 | 1521 | } |
93406d87 | 1522 | |
d62a17ae | 1523 | if (other == peer) |
996c9314 LB |
1524 | ret = 1; /* bgp_establish specific code when xfer_conn |
1525 | happens. */ | |
d62a17ae | 1526 | |
1527 | /* Reset capability open status flag. */ | |
1528 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN)) | |
1529 | SET_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN); | |
1530 | ||
1531 | /* Clear start timer value to default. */ | |
1532 | peer->v_start = BGP_INIT_START_TIMER; | |
1533 | ||
1534 | /* Increment established count. */ | |
1535 | peer->established++; | |
1536 | bgp_fsm_change_status(peer, Established); | |
1537 | ||
1538 | /* bgp log-neighbor-changes of neighbor Up */ | |
1539 | if (bgp_flag_check(peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { | |
1540 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); | |
1541 | zlog_info("%%ADJCHANGE: neighbor %s(%s) in vrf %s Up", | |
1542 | peer->host, | |
1543 | (peer->hostname) ? peer->hostname : "Unknown", | |
1544 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) ? vrf->name | |
1545 | : "Default") | |
1546 | : ""); | |
1547 | } | |
1548 | /* assign update-group/subgroup */ | |
1549 | update_group_adjust_peer_afs(peer); | |
1550 | ||
1551 | /* graceful restart */ | |
1552 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
1553 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 1554 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) { |
d62a17ae | 1555 | if (peer->afc_nego[afi][safi] |
1556 | && CHECK_FLAG(peer->cap, PEER_CAP_RESTART_ADV) | |
1557 | && CHECK_FLAG(peer->af_cap[afi][safi], | |
1558 | PEER_CAP_RESTART_AF_RCV)) { | |
1559 | if (peer->nsf[afi][safi] | |
1560 | && !CHECK_FLAG( | |
1561 | peer->af_cap[afi][safi], | |
1562 | PEER_CAP_RESTART_AF_PRESERVE_RCV)) | |
1563 | bgp_clear_stale_route(peer, afi, safi); | |
1564 | ||
1565 | peer->nsf[afi][safi] = 1; | |
1566 | nsf_af_count++; | |
1567 | } else { | |
1568 | if (peer->nsf[afi][safi]) | |
1569 | bgp_clear_stale_route(peer, afi, safi); | |
1570 | peer->nsf[afi][safi] = 0; | |
1571 | } | |
1572 | } | |
1573 | ||
1574 | if (nsf_af_count) | |
1575 | SET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1576 | else { | |
1577 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1578 | if (peer->t_gr_stale) { | |
1579 | BGP_TIMER_OFF(peer->t_gr_stale); | |
1580 | if (bgp_debug_neighbor_events(peer)) | |
1581 | zlog_debug( | |
1582 | "%s graceful restart stalepath timer stopped", | |
1583 | peer->host); | |
1584 | } | |
1585 | } | |
93406d87 | 1586 | |
d62a17ae | 1587 | if (peer->t_gr_restart) { |
1588 | BGP_TIMER_OFF(peer->t_gr_restart); | |
1589 | if (bgp_debug_neighbor_events(peer)) | |
1590 | zlog_debug("%s graceful restart timer stopped", | |
1591 | peer->host); | |
1592 | } | |
718e3744 | 1593 | |
d62a17ae | 1594 | hook_call(peer_established, peer); |
1595 | ||
9eb217ff QY |
1596 | /* Reset uptime, turn on keepalives, send current table. */ |
1597 | if (!peer->v_holdtime) | |
1598 | bgp_keepalives_on(peer); | |
1599 | ||
d62a17ae | 1600 | peer->uptime = bgp_clock(); |
1601 | ||
1602 | /* Send route-refresh when ORF is enabled */ | |
05c7a1cc QY |
1603 | FOREACH_AFI_SAFI (afi, safi) { |
1604 | if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1605 | PEER_CAP_ORF_PREFIX_SM_ADV)) { | |
d62a17ae | 1606 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc QY |
1607 | PEER_CAP_ORF_PREFIX_RM_RCV)) |
1608 | bgp_route_refresh_send(peer, afi, safi, | |
1609 | ORF_TYPE_PREFIX, | |
1610 | REFRESH_IMMEDIATE, 0); | |
1611 | else if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1612 | PEER_CAP_ORF_PREFIX_RM_OLD_RCV)) | |
1613 | bgp_route_refresh_send(peer, afi, safi, | |
1614 | ORF_TYPE_PREFIX_OLD, | |
1615 | REFRESH_IMMEDIATE, 0); | |
1616 | } | |
1617 | } | |
d62a17ae | 1618 | |
1619 | /* First update is deferred until ORF or ROUTE-REFRESH is received */ | |
05c7a1cc QY |
1620 | FOREACH_AFI_SAFI (afi, safi) { |
1621 | if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1622 | PEER_CAP_ORF_PREFIX_RM_ADV)) | |
d62a17ae | 1623 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc QY |
1624 | PEER_CAP_ORF_PREFIX_SM_RCV) |
1625 | || CHECK_FLAG(peer->af_cap[afi][safi], | |
1626 | PEER_CAP_ORF_PREFIX_SM_OLD_RCV)) | |
1627 | SET_FLAG(peer->af_sflags[afi][safi], | |
1628 | PEER_STATUS_ORF_WAIT_REFRESH); | |
1629 | } | |
d62a17ae | 1630 | |
1631 | bgp_announce_peer(peer); | |
1632 | ||
1633 | /* Start the route advertisement timer to send updates to the peer - if | |
1634 | * BGP | |
1635 | * is not in read-only mode. If it is, the timer will be started at the | |
1636 | * end | |
1637 | * of read-only mode. | |
1638 | */ | |
1639 | if (!bgp_update_delay_active(peer->bgp)) { | |
1640 | BGP_TIMER_OFF(peer->t_routeadv); | |
1641 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
1642 | } | |
718e3744 | 1643 | |
d62a17ae | 1644 | if (peer->doppelganger && (peer->doppelganger->status != Deleted)) { |
1645 | if (bgp_debug_neighbor_events(peer)) | |
1646 | zlog_debug( | |
1647 | "[Event] Deleting stub connection for peer %s", | |
1648 | peer->host); | |
1649 | ||
1650 | if (peer->doppelganger->status > Active) | |
1651 | bgp_notify_send(peer->doppelganger, BGP_NOTIFY_CEASE, | |
1652 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
1653 | else | |
1654 | peer_delete(peer->doppelganger); | |
718e3744 | 1655 | } |
1656 | ||
d62a17ae | 1657 | bgp_bfd_register_peer(peer); |
1658 | return ret; | |
718e3744 | 1659 | } |
1660 | ||
1661 | /* Keepalive packet is received. */ | |
d62a17ae | 1662 | static int bgp_fsm_keepalive(struct peer *peer) |
718e3744 | 1663 | { |
d62a17ae | 1664 | BGP_TIMER_OFF(peer->t_holdtime); |
1665 | return 0; | |
718e3744 | 1666 | } |
1667 | ||
1668 | /* Update packet is received. */ | |
d62a17ae | 1669 | static int bgp_fsm_update(struct peer *peer) |
718e3744 | 1670 | { |
d62a17ae | 1671 | BGP_TIMER_OFF(peer->t_holdtime); |
1672 | return 0; | |
718e3744 | 1673 | } |
1674 | ||
1675 | /* This is empty event. */ | |
d62a17ae | 1676 | static int bgp_ignore(struct peer *peer) |
718e3744 | 1677 | { |
d62a17ae | 1678 | zlog_err( |
1679 | "%s [FSM] Ignoring event %s in state %s, prior events %s, %s, fd %d", | |
1680 | peer->host, bgp_event_str[peer->cur_event], | |
1681 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1682 | bgp_event_str[peer->last_event], | |
1683 | bgp_event_str[peer->last_major_event], peer->fd); | |
1684 | return 0; | |
718e3744 | 1685 | } |
6b0655a2 | 1686 | |
6403814c | 1687 | /* This is to handle unexpected events.. */ |
d62a17ae | 1688 | static int bgp_fsm_exeption(struct peer *peer) |
6403814c | 1689 | { |
d62a17ae | 1690 | zlog_err( |
1691 | "%s [FSM] Unexpected event %s in state %s, prior events %s, %s, fd %d", | |
1692 | peer->host, bgp_event_str[peer->cur_event], | |
1693 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1694 | bgp_event_str[peer->last_event], | |
1695 | bgp_event_str[peer->last_major_event], peer->fd); | |
1696 | return (bgp_stop(peer)); | |
6403814c DS |
1697 | } |
1698 | ||
d62a17ae | 1699 | void bgp_fsm_nht_update(struct peer *peer, int valid) |
fc9a856f | 1700 | { |
d62a17ae | 1701 | if (!peer) |
1702 | return; | |
1703 | ||
1704 | switch (peer->status) { | |
1705 | case Idle: | |
1706 | if (valid) | |
1707 | BGP_EVENT_ADD(peer, BGP_Start); | |
1708 | break; | |
1709 | case Connect: | |
1710 | if (!valid) { | |
1711 | BGP_TIMER_OFF(peer->t_connect); | |
1712 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
1713 | } | |
1714 | break; | |
1715 | case Active: | |
1716 | if (valid) { | |
1717 | BGP_TIMER_OFF(peer->t_connect); | |
1718 | BGP_EVENT_ADD(peer, ConnectRetry_timer_expired); | |
1719 | } | |
1720 | break; | |
1721 | case OpenSent: | |
1722 | case OpenConfirm: | |
1723 | case Established: | |
1724 | if (!valid && (peer->gtsm_hops == 1)) | |
1725 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
1726 | case Clearing: | |
1727 | case Deleted: | |
1728 | default: | |
1729 | break; | |
fc9a856f | 1730 | } |
fc9a856f DS |
1731 | } |
1732 | ||
1733 | ||
718e3744 | 1734 | /* Finite State Machine structure */ |
fda1d3e0 | 1735 | static const struct { |
d62a17ae | 1736 | int (*func)(struct peer *); |
1737 | int next_state; | |
1738 | } FSM[BGP_STATUS_MAX - 1][BGP_EVENTS_MAX - 1] = { | |
1739 | { | |
1740 | /* Idle state: In Idle state, all events other than BGP_Start is | |
1741 | ignored. With BGP_Start event, finite state machine calls | |
1742 | bgp_start(). */ | |
1743 | {bgp_start, Connect}, /* BGP_Start */ | |
1744 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1745 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1746 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1747 | {bgp_ignore, Idle}, /* TCP_connection_open_failed */ | |
1748 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1749 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ | |
1750 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
1751 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
1752 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
1753 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
1754 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
1755 | {bgp_ignore, Idle}, /* Receive_NOTIFICATION_message */ | |
1756 | {bgp_ignore, Idle}, /* Clearing_Completed */ | |
1757 | }, | |
1758 | { | |
1759 | /* Connect */ | |
1760 | {bgp_ignore, Connect}, /* BGP_Start */ | |
1761 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1762 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1763 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1764 | {bgp_connect_fail, Active}, /* TCP_connection_open_failed */ | |
1765 | {bgp_connect_fail, Idle}, /* TCP_fatal_error */ | |
1766 | {bgp_reconnect, Connect}, /* ConnectRetry_timer_expired */ | |
1767 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ | |
1768 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1769 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1770 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
1771 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1772 | {bgp_stop, Idle}, /* Receive_NOTIFICATION_message */ | |
1773 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1774 | }, | |
1775 | { | |
1776 | /* Active, */ | |
1777 | {bgp_ignore, Active}, /* BGP_Start */ | |
1778 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1779 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1780 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1781 | {bgp_ignore, Active}, /* TCP_connection_open_failed */ | |
1782 | {bgp_fsm_exeption, Idle}, /* TCP_fatal_error */ | |
1783 | {bgp_start, Connect}, /* ConnectRetry_timer_expired */ | |
1784 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ | |
1785 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1786 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1787 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
1788 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1789 | {bgp_fsm_exeption, Idle}, /* Receive_NOTIFICATION_message */ | |
1790 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1791 | }, | |
1792 | { | |
1793 | /* OpenSent, */ | |
1794 | {bgp_ignore, OpenSent}, /* BGP_Start */ | |
1795 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1796 | {bgp_stop, Active}, /* TCP_connection_open */ | |
1797 | {bgp_stop, Active}, /* TCP_connection_closed */ | |
1798 | {bgp_stop, Active}, /* TCP_connection_open_failed */ | |
1799 | {bgp_stop, Active}, /* TCP_fatal_error */ | |
1800 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ | |
1801 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
1802 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1803 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ | |
1804 | {bgp_fsm_event_error, Idle}, /* Receive_KEEPALIVE_message */ | |
1805 | {bgp_fsm_event_error, Idle}, /* Receive_UPDATE_message */ | |
1806 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
1807 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1808 | }, | |
1809 | { | |
1810 | /* OpenConfirm, */ | |
1811 | {bgp_ignore, OpenConfirm}, /* BGP_Start */ | |
1812 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1813 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1814 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1815 | {bgp_stop, Idle}, /* TCP_connection_open_failed */ | |
1816 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1817 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ | |
1818 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
1819 | {bgp_ignore, OpenConfirm}, /* KeepAlive_timer_expired */ | |
1820 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1821 | {bgp_establish, Established}, /* Receive_KEEPALIVE_message */ | |
1822 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1823 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
1824 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1825 | }, | |
1826 | { | |
1827 | /* Established, */ | |
1828 | {bgp_ignore, Established}, /* BGP_Start */ | |
1829 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
1830 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1831 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
1832 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
1833 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
1834 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
1835 | {bgp_fsm_holdtime_expire, Clearing}, /* Hold_Timer_expired */ | |
03014d48 QY |
1836 | {bgp_ignore, Established}, /* KeepAlive_timer_expired */ |
1837 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
d62a17ae | 1838 | {bgp_fsm_keepalive, |
1839 | Established}, /* Receive_KEEPALIVE_message */ | |
1840 | {bgp_fsm_update, Established}, /* Receive_UPDATE_message */ | |
1841 | {bgp_stop_with_error, | |
1842 | Clearing}, /* Receive_NOTIFICATION_message */ | |
1843 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1844 | }, | |
1845 | { | |
1846 | /* Clearing, */ | |
1847 | {bgp_ignore, Clearing}, /* BGP_Start */ | |
1848 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
1849 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1850 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
1851 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
1852 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
1853 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
1854 | {bgp_stop, Clearing}, /* Hold_Timer_expired */ | |
1855 | {bgp_stop, Clearing}, /* KeepAlive_timer_expired */ | |
1856 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
1857 | {bgp_stop, Clearing}, /* Receive_KEEPALIVE_message */ | |
1858 | {bgp_stop, Clearing}, /* Receive_UPDATE_message */ | |
1859 | {bgp_stop, Clearing}, /* Receive_NOTIFICATION_message */ | |
1860 | {bgp_clearing_completed, Idle}, /* Clearing_Completed */ | |
1861 | }, | |
1862 | { | |
1863 | /* Deleted, */ | |
1864 | {bgp_ignore, Deleted}, /* BGP_Start */ | |
1865 | {bgp_ignore, Deleted}, /* BGP_Stop */ | |
1866 | {bgp_ignore, Deleted}, /* TCP_connection_open */ | |
1867 | {bgp_ignore, Deleted}, /* TCP_connection_closed */ | |
1868 | {bgp_ignore, Deleted}, /* TCP_connection_open_failed */ | |
1869 | {bgp_ignore, Deleted}, /* TCP_fatal_error */ | |
1870 | {bgp_ignore, Deleted}, /* ConnectRetry_timer_expired */ | |
1871 | {bgp_ignore, Deleted}, /* Hold_Timer_expired */ | |
1872 | {bgp_ignore, Deleted}, /* KeepAlive_timer_expired */ | |
1873 | {bgp_ignore, Deleted}, /* Receive_OPEN_message */ | |
1874 | {bgp_ignore, Deleted}, /* Receive_KEEPALIVE_message */ | |
1875 | {bgp_ignore, Deleted}, /* Receive_UPDATE_message */ | |
1876 | {bgp_ignore, Deleted}, /* Receive_NOTIFICATION_message */ | |
1877 | {bgp_ignore, Deleted}, /* Clearing_Completed */ | |
1878 | }, | |
718e3744 | 1879 | }; |
1880 | ||
718e3744 | 1881 | /* Execute event process. */ |
d62a17ae | 1882 | int bgp_event(struct thread *thread) |
718e3744 | 1883 | { |
d62a17ae | 1884 | int event; |
1885 | struct peer *peer; | |
1886 | int ret; | |
718e3744 | 1887 | |
d62a17ae | 1888 | peer = THREAD_ARG(thread); |
1889 | event = THREAD_VAL(thread); | |
718e3744 | 1890 | |
d62a17ae | 1891 | ret = bgp_event_update(peer, event); |
1ff9a340 | 1892 | |
d62a17ae | 1893 | return (ret); |
1ff9a340 DS |
1894 | } |
1895 | ||
d62a17ae | 1896 | int bgp_event_update(struct peer *peer, int event) |
1ff9a340 | 1897 | { |
d62a17ae | 1898 | int next; |
1899 | int ret = 0; | |
1900 | struct peer *other; | |
1901 | int passive_conn = 0; | |
1902 | int dyn_nbr; | |
1903 | ||
d8151687 QY |
1904 | /* default return code */ |
1905 | ret = FSM_PEER_NOOP; | |
1906 | ||
d62a17ae | 1907 | other = peer->doppelganger; |
1908 | passive_conn = | |
1909 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) ? 1 : 0; | |
1910 | dyn_nbr = peer_dynamic_neighbor(peer); | |
1911 | ||
1912 | /* Logging this event. */ | |
1913 | next = FSM[peer->status - 1][event - 1].next_state; | |
1914 | ||
1915 | if (bgp_debug_neighbor_events(peer) && peer->status != next) | |
1916 | zlog_debug("%s [FSM] %s (%s->%s), fd %d", peer->host, | |
1917 | bgp_event_str[event], | |
1918 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1919 | lookup_msg(bgp_status_msg, next, NULL), peer->fd); | |
1920 | ||
1921 | peer->last_event = peer->cur_event; | |
1922 | peer->cur_event = event; | |
1923 | ||
1924 | /* Call function. */ | |
1925 | if (FSM[peer->status - 1][event - 1].func) | |
1926 | ret = (*(FSM[peer->status - 1][event - 1].func))(peer); | |
1927 | ||
d62a17ae | 1928 | if (ret >= 0) { |
1929 | if (ret == 1 && next == Established) { | |
1930 | /* The case when doppelganger swap accurred in | |
1931 | bgp_establish. | |
1932 | Update the peer pointer accordingly */ | |
d8151687 | 1933 | ret = FSM_PEER_TRANSFERRED; |
d62a17ae | 1934 | peer = other; |
1935 | } | |
1936 | ||
1937 | /* If status is changed. */ | |
d8151687 | 1938 | if (next != peer->status) { |
d62a17ae | 1939 | bgp_fsm_change_status(peer, next); |
1940 | ||
becedef6 QY |
1941 | /* |
1942 | * If we're going to ESTABLISHED then we executed a | |
1943 | * peer transfer. In this case we can either return | |
1944 | * FSM_PEER_TRANSITIONED or FSM_PEER_TRANSFERRED. | |
1945 | * Opting for TRANSFERRED since transfer implies | |
1946 | * session establishment. | |
1947 | */ | |
d8151687 QY |
1948 | if (ret != FSM_PEER_TRANSFERRED) |
1949 | ret = FSM_PEER_TRANSITIONED; | |
1950 | } | |
1951 | ||
d62a17ae | 1952 | /* Make sure timer is set. */ |
1953 | bgp_timer_set(peer); | |
1954 | ||
bea01226 | 1955 | } else { |
becedef6 QY |
1956 | /* |
1957 | * If we got a return value of -1, that means there was an | |
1958 | * error, restart the FSM. Since bgp_stop() was called on the | |
1959 | * peer. only a few fields are safe to access here. In any case | |
1960 | * we need to indicate that the peer was stopped in the return | |
1961 | * code. | |
1962 | */ | |
bea01226 QY |
1963 | if (!dyn_nbr && !passive_conn && peer->bgp) { |
1964 | zlog_err( | |
1965 | "%s [FSM] Failure handling event %s in state %s, " | |
1966 | "prior events %s, %s, fd %d", | |
1967 | peer->host, bgp_event_str[peer->cur_event], | |
1968 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1969 | bgp_event_str[peer->last_event], | |
1970 | bgp_event_str[peer->last_major_event], | |
1971 | peer->fd); | |
1972 | bgp_stop(peer); | |
1973 | bgp_fsm_change_status(peer, Idle); | |
1974 | bgp_timer_set(peer); | |
1975 | } | |
1976 | ret = FSM_PEER_STOPPED; | |
d62a17ae | 1977 | } |
bea01226 | 1978 | |
d62a17ae | 1979 | return ret; |
718e3744 | 1980 | } |