]>
Commit | Line | Data |
---|---|---|
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" |
02705213 | 37 | #include "lib_errors.h" |
718e3744 | 38 | |
856ca177 | 39 | #include "lib/json.h" |
718e3744 | 40 | #include "bgpd/bgpd.h" |
41 | #include "bgpd/bgp_attr.h" | |
42 | #include "bgpd/bgp_debug.h" | |
14454c9f | 43 | #include "bgpd/bgp_errors.h" |
718e3744 | 44 | #include "bgpd/bgp_fsm.h" |
45 | #include "bgpd/bgp_packet.h" | |
46 | #include "bgpd/bgp_network.h" | |
47 | #include "bgpd/bgp_route.h" | |
48 | #include "bgpd/bgp_dump.h" | |
49 | #include "bgpd/bgp_open.h" | |
f188f2c4 | 50 | #include "bgpd/bgp_advertise.h" |
3f9c7369 | 51 | #include "bgpd/bgp_updgrp.h" |
ffd0c037 | 52 | #include "bgpd/bgp_nht.h" |
c43ed2e4 | 53 | #include "bgpd/bgp_bfd.h" |
4a1ab8e4 | 54 | #include "bgpd/bgp_memory.h" |
03014d48 | 55 | #include "bgpd/bgp_keepalives.h" |
56257a44 | 56 | #include "bgpd/bgp_io.h" |
c42eab4b | 57 | #include "bgpd/bgp_zebra.h" |
6b0655a2 | 58 | |
d62a17ae | 59 | DEFINE_HOOK(peer_backward_transition, (struct peer * peer), (peer)) |
60 | DEFINE_HOOK(peer_established, (struct peer * peer), (peer)) | |
3012671f | 61 | |
6403814c DS |
62 | /* Definition of display strings corresponding to FSM events. This should be |
63 | * kept consistent with the events defined in bgpd.h | |
64 | */ | |
d62a17ae | 65 | static const char *bgp_event_str[] = { |
66 | NULL, | |
67 | "BGP_Start", | |
68 | "BGP_Stop", | |
69 | "TCP_connection_open", | |
70 | "TCP_connection_closed", | |
71 | "TCP_connection_open_failed", | |
72 | "TCP_fatal_error", | |
73 | "ConnectRetry_timer_expired", | |
74 | "Hold_Timer_expired", | |
75 | "KeepAlive_timer_expired", | |
76 | "Receive_OPEN_message", | |
77 | "Receive_KEEPALIVE_message", | |
78 | "Receive_UPDATE_message", | |
79 | "Receive_NOTIFICATION_message", | |
80 | "Clearing_Completed", | |
6403814c DS |
81 | }; |
82 | ||
718e3744 | 83 | /* BGP FSM (finite state machine) has three types of functions. Type |
84 | one is thread functions. Type two is event functions. Type three | |
85 | is FSM functions. Timer functions are set by bgp_timer_set | |
86 | function. */ | |
87 | ||
88 | /* BGP event function. */ | |
d62a17ae | 89 | int bgp_event(struct thread *); |
718e3744 | 90 | |
91 | /* BGP thread functions. */ | |
d62a17ae | 92 | static int bgp_start_timer(struct thread *); |
93 | static int bgp_connect_timer(struct thread *); | |
94 | static int bgp_holdtime_timer(struct thread *); | |
718e3744 | 95 | |
96 | /* BGP FSM functions. */ | |
d62a17ae | 97 | static int bgp_start(struct peer *); |
718e3744 | 98 | |
d62a17ae | 99 | static void peer_xfer_stats(struct peer *peer_dst, struct peer *peer_src) |
1ff9a340 | 100 | { |
d62a17ae | 101 | /* Copy stats over. These are only the pre-established state stats */ |
102 | peer_dst->open_in += peer_src->open_in; | |
103 | peer_dst->open_out += peer_src->open_out; | |
104 | peer_dst->keepalive_in += peer_src->keepalive_in; | |
105 | peer_dst->keepalive_out += peer_src->keepalive_out; | |
106 | peer_dst->notify_in += peer_src->notify_in; | |
107 | peer_dst->notify_out += peer_src->notify_out; | |
108 | peer_dst->dynamic_cap_in += peer_src->dynamic_cap_in; | |
109 | peer_dst->dynamic_cap_out += peer_src->dynamic_cap_out; | |
1ff9a340 DS |
110 | } |
111 | ||
d62a17ae | 112 | static struct peer *peer_xfer_conn(struct peer *from_peer) |
1ff9a340 | 113 | { |
d62a17ae | 114 | struct peer *peer; |
115 | afi_t afi; | |
116 | safi_t safi; | |
117 | int fd; | |
118 | int status, pstatus; | |
119 | unsigned char last_evt, last_maj_evt; | |
120 | ||
121 | assert(from_peer != NULL); | |
122 | ||
123 | peer = from_peer->doppelganger; | |
124 | ||
125 | if (!peer || !CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE)) | |
126 | return from_peer; | |
127 | ||
128 | if (bgp_debug_neighbor_events(peer)) | |
129 | zlog_debug("%s: peer transfer %p fd %d -> %p fd %d)", | |
130 | from_peer->host, from_peer, from_peer->fd, peer, | |
131 | peer->fd); | |
132 | ||
424ab01d QY |
133 | bgp_writes_off(peer); |
134 | bgp_reads_off(peer); | |
135 | bgp_writes_off(from_peer); | |
136 | bgp_reads_off(from_peer); | |
d62a17ae | 137 | |
138 | BGP_TIMER_OFF(peer->t_routeadv); | |
424ab01d | 139 | BGP_TIMER_OFF(peer->t_connect); |
387f984e QY |
140 | BGP_TIMER_OFF(peer->t_connect_check_r); |
141 | BGP_TIMER_OFF(peer->t_connect_check_w); | |
d62a17ae | 142 | BGP_TIMER_OFF(from_peer->t_routeadv); |
424ab01d | 143 | BGP_TIMER_OFF(from_peer->t_connect); |
387f984e QY |
144 | BGP_TIMER_OFF(from_peer->t_connect_check_r); |
145 | BGP_TIMER_OFF(from_peer->t_connect_check_w); | |
7a86aa5a | 146 | BGP_TIMER_OFF(from_peer->t_process_packet); |
d3ecc69e | 147 | |
becedef6 QY |
148 | /* |
149 | * At this point in time, it is possible that there are packets pending | |
150 | * on various buffers. Those need to be transferred or dropped, | |
151 | * otherwise we'll get spurious failures during session establishment. | |
152 | */ | |
424ab01d QY |
153 | pthread_mutex_lock(&peer->io_mtx); |
154 | pthread_mutex_lock(&from_peer->io_mtx); | |
d3ecc69e | 155 | { |
424ab01d QY |
156 | fd = peer->fd; |
157 | peer->fd = from_peer->fd; | |
158 | from_peer->fd = fd; | |
159 | ||
160 | stream_fifo_clean(peer->ibuf); | |
d3ecc69e | 161 | stream_fifo_clean(peer->obuf); |
d3ecc69e | 162 | |
becedef6 QY |
163 | /* |
164 | * this should never happen, since bgp_process_packet() is the | |
165 | * only task that sets and unsets the current packet and it | |
166 | * runs in our pthread. | |
167 | */ | |
424ab01d | 168 | if (peer->curr) { |
af4c2728 | 169 | flog_err( |
14454c9f | 170 | BGP_ERR_PKT_PROCESS, |
424ab01d QY |
171 | "[%s] Dropping pending packet on connection transfer:", |
172 | peer->host); | |
d7c0a89a QY |
173 | uint16_t type = stream_getc_from(peer->curr, |
174 | BGP_MARKER_SIZE + 2); | |
424ab01d QY |
175 | bgp_dump_packet(peer, type, peer->curr); |
176 | stream_free(peer->curr); | |
177 | peer->curr = NULL; | |
178 | } | |
179 | ||
180 | // copy each packet from old peer's output queue to new peer | |
727c4f87 QY |
181 | while (from_peer->obuf->head) |
182 | stream_fifo_push(peer->obuf, | |
183 | stream_fifo_pop(from_peer->obuf)); | |
424ab01d QY |
184 | |
185 | // copy each packet from old peer's input queue to new peer | |
186 | while (from_peer->ibuf->head) | |
187 | stream_fifo_push(peer->ibuf, | |
188 | stream_fifo_pop(from_peer->ibuf)); | |
7db44ec8 | 189 | |
74ffbfe6 QY |
190 | ringbuf_wipe(peer->ibuf_work); |
191 | ringbuf_copy(peer->ibuf_work, from_peer->ibuf_work, | |
192 | ringbuf_remain(from_peer->ibuf_work)); | |
d3ecc69e | 193 | } |
424ab01d QY |
194 | pthread_mutex_unlock(&from_peer->io_mtx); |
195 | pthread_mutex_unlock(&peer->io_mtx); | |
d62a17ae | 196 | |
197 | peer->as = from_peer->as; | |
198 | peer->v_holdtime = from_peer->v_holdtime; | |
199 | peer->v_keepalive = from_peer->v_keepalive; | |
d62a17ae | 200 | peer->v_routeadv = from_peer->v_routeadv; |
201 | peer->v_gr_restart = from_peer->v_gr_restart; | |
202 | peer->cap = from_peer->cap; | |
203 | status = peer->status; | |
204 | pstatus = peer->ostatus; | |
205 | last_evt = peer->last_event; | |
206 | last_maj_evt = peer->last_major_event; | |
207 | peer->status = from_peer->status; | |
208 | peer->ostatus = from_peer->ostatus; | |
209 | peer->last_event = from_peer->last_event; | |
210 | peer->last_major_event = from_peer->last_major_event; | |
211 | from_peer->status = status; | |
212 | from_peer->ostatus = pstatus; | |
213 | from_peer->last_event = last_evt; | |
214 | from_peer->last_major_event = last_maj_evt; | |
215 | peer->remote_id = from_peer->remote_id; | |
216 | ||
217 | if (from_peer->hostname != NULL) { | |
218 | if (peer->hostname) { | |
219 | XFREE(MTYPE_BGP_PEER_HOST, peer->hostname); | |
220 | peer->hostname = NULL; | |
221 | } | |
222 | ||
223 | peer->hostname = from_peer->hostname; | |
224 | from_peer->hostname = NULL; | |
225 | } | |
226 | ||
227 | if (from_peer->domainname != NULL) { | |
228 | if (peer->domainname) { | |
229 | XFREE(MTYPE_BGP_PEER_HOST, peer->domainname); | |
230 | peer->domainname = NULL; | |
231 | } | |
232 | ||
233 | peer->domainname = from_peer->domainname; | |
234 | from_peer->domainname = NULL; | |
235 | } | |
236 | ||
05c7a1cc QY |
237 | FOREACH_AFI_SAFI (afi, safi) { |
238 | peer->af_flags[afi][safi] = from_peer->af_flags[afi][safi]; | |
239 | peer->af_sflags[afi][safi] = from_peer->af_sflags[afi][safi]; | |
240 | peer->af_cap[afi][safi] = from_peer->af_cap[afi][safi]; | |
241 | peer->afc_nego[afi][safi] = from_peer->afc_nego[afi][safi]; | |
242 | peer->afc_adv[afi][safi] = from_peer->afc_adv[afi][safi]; | |
243 | peer->afc_recv[afi][safi] = from_peer->afc_recv[afi][safi]; | |
244 | peer->orf_plist[afi][safi] = from_peer->orf_plist[afi][safi]; | |
245 | } | |
d62a17ae | 246 | |
247 | if (bgp_getsockname(peer) < 0) { | |
af4c2728 | 248 | flog_err( |
02705213 | 249 | LIB_ERR_SOCKET, |
d62a17ae | 250 | "%%bgp_getsockname() failed for %s peer %s fd %d (from_peer fd %d)", |
251 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER) | |
252 | ? "accept" | |
253 | : ""), | |
254 | peer->host, peer->fd, from_peer->fd); | |
255 | bgp_stop(peer); | |
256 | bgp_stop(from_peer); | |
257 | return NULL; | |
258 | } | |
259 | if (from_peer->status > Active) { | |
260 | if (bgp_getsockname(from_peer) < 0) { | |
af4c2728 | 261 | flog_err( |
02705213 | 262 | LIB_ERR_SOCKET, |
d62a17ae | 263 | "%%bgp_getsockname() failed for %s from_peer %s fd %d (peer fd %d)", |
14454c9f | 264 | |
d62a17ae | 265 | (CHECK_FLAG(from_peer->sflags, |
266 | PEER_STATUS_ACCEPT_PEER) | |
267 | ? "accept" | |
268 | : ""), | |
269 | from_peer->host, from_peer->fd, peer->fd); | |
270 | bgp_stop(from_peer); | |
271 | from_peer = NULL; | |
272 | } | |
273 | } | |
274 | ||
0112e9e0 QY |
275 | |
276 | // Note: peer_xfer_stats() must be called with I/O turned OFF | |
277 | if (from_peer) | |
278 | peer_xfer_stats(peer, from_peer); | |
279 | ||
424ab01d QY |
280 | bgp_reads_on(peer); |
281 | bgp_writes_on(peer); | |
7a86aa5a QY |
282 | thread_add_timer_msec(bm->master, bgp_process_packet, peer, 0, |
283 | &peer->t_process_packet); | |
d62a17ae | 284 | |
d62a17ae | 285 | return (peer); |
1ff9a340 DS |
286 | } |
287 | ||
718e3744 | 288 | /* Hook function called after bgp event is occered. And vty's |
289 | neighbor command invoke this function after making neighbor | |
290 | structure. */ | |
d62a17ae | 291 | void bgp_timer_set(struct peer *peer) |
718e3744 | 292 | { |
d62a17ae | 293 | switch (peer->status) { |
294 | case Idle: | |
295 | /* First entry point of peer's finite state machine. In Idle | |
296 | status start timer is on unless peer is shutdown or peer is | |
297 | inactive. All other timer must be turned off */ | |
f62abc7d PG |
298 | if (BGP_PEER_START_SUPPRESSED(peer) || !peer_active(peer) |
299 | || peer->bgp->vrf_id == VRF_UNKNOWN) { | |
d62a17ae | 300 | BGP_TIMER_OFF(peer->t_start); |
301 | } else { | |
302 | BGP_TIMER_ON(peer->t_start, bgp_start_timer, | |
303 | peer->v_start); | |
304 | } | |
305 | BGP_TIMER_OFF(peer->t_connect); | |
306 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 307 | bgp_keepalives_off(peer); |
d62a17ae | 308 | BGP_TIMER_OFF(peer->t_routeadv); |
309 | break; | |
310 | ||
311 | case Connect: | |
312 | /* After start timer is expired, the peer moves to Connect | |
313 | status. Make sure start timer is off and connect timer is | |
314 | on. */ | |
315 | BGP_TIMER_OFF(peer->t_start); | |
316 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
317 | peer->v_connect); | |
318 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 319 | bgp_keepalives_off(peer); |
d62a17ae | 320 | BGP_TIMER_OFF(peer->t_routeadv); |
321 | break; | |
322 | ||
323 | case Active: | |
324 | /* Active is waiting connection from remote peer. And if | |
325 | connect timer is expired, change status to Connect. */ | |
326 | BGP_TIMER_OFF(peer->t_start); | |
327 | /* If peer is passive mode, do not set connect timer. */ | |
328 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE) | |
329 | || CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
330 | BGP_TIMER_OFF(peer->t_connect); | |
331 | } else { | |
332 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
333 | peer->v_connect); | |
334 | } | |
335 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 336 | bgp_keepalives_off(peer); |
d62a17ae | 337 | BGP_TIMER_OFF(peer->t_routeadv); |
338 | break; | |
339 | ||
340 | case OpenSent: | |
341 | /* OpenSent status. */ | |
342 | BGP_TIMER_OFF(peer->t_start); | |
343 | BGP_TIMER_OFF(peer->t_connect); | |
344 | if (peer->v_holdtime != 0) { | |
345 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
346 | peer->v_holdtime); | |
347 | } else { | |
348 | BGP_TIMER_OFF(peer->t_holdtime); | |
349 | } | |
b72b6f4f | 350 | bgp_keepalives_off(peer); |
d62a17ae | 351 | BGP_TIMER_OFF(peer->t_routeadv); |
352 | break; | |
353 | ||
354 | case OpenConfirm: | |
355 | /* OpenConfirm status. */ | |
356 | BGP_TIMER_OFF(peer->t_start); | |
357 | BGP_TIMER_OFF(peer->t_connect); | |
358 | ||
359 | /* If the negotiated Hold Time value is zero, then the Hold Time | |
360 | timer and KeepAlive timers are not started. */ | |
361 | if (peer->v_holdtime == 0) { | |
362 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 363 | bgp_keepalives_off(peer); |
d62a17ae | 364 | } else { |
365 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
366 | peer->v_holdtime); | |
b72b6f4f | 367 | bgp_keepalives_on(peer); |
d62a17ae | 368 | } |
369 | BGP_TIMER_OFF(peer->t_routeadv); | |
370 | break; | |
371 | ||
372 | case Established: | |
373 | /* In Established status start and connect timer is turned | |
374 | off. */ | |
375 | BGP_TIMER_OFF(peer->t_start); | |
376 | BGP_TIMER_OFF(peer->t_connect); | |
377 | ||
378 | /* Same as OpenConfirm, if holdtime is zero then both holdtime | |
379 | and keepalive must be turned off. */ | |
380 | if (peer->v_holdtime == 0) { | |
381 | BGP_TIMER_OFF(peer->t_holdtime); | |
bea01226 | 382 | bgp_keepalives_off(peer); |
d62a17ae | 383 | } else { |
384 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
385 | peer->v_holdtime); | |
bea01226 | 386 | bgp_keepalives_on(peer); |
d62a17ae | 387 | } |
388 | break; | |
389 | case Deleted: | |
390 | BGP_TIMER_OFF(peer->t_gr_restart); | |
391 | BGP_TIMER_OFF(peer->t_gr_stale); | |
392 | BGP_TIMER_OFF(peer->t_pmax_restart); | |
393 | /* fallthru */ | |
394 | case Clearing: | |
395 | BGP_TIMER_OFF(peer->t_start); | |
396 | BGP_TIMER_OFF(peer->t_connect); | |
397 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 398 | bgp_keepalives_off(peer); |
d62a17ae | 399 | BGP_TIMER_OFF(peer->t_routeadv); |
400 | break; | |
718e3744 | 401 | } |
718e3744 | 402 | } |
403 | ||
404 | /* BGP start timer. This function set BGP_Start event to thread value | |
405 | and process event. */ | |
d62a17ae | 406 | static int bgp_start_timer(struct thread *thread) |
718e3744 | 407 | { |
d62a17ae | 408 | struct peer *peer; |
718e3744 | 409 | |
d62a17ae | 410 | peer = THREAD_ARG(thread); |
411 | peer->t_start = NULL; | |
718e3744 | 412 | |
d62a17ae | 413 | if (bgp_debug_neighbor_events(peer)) |
414 | zlog_debug("%s [FSM] Timer (start timer expire).", peer->host); | |
718e3744 | 415 | |
d62a17ae | 416 | THREAD_VAL(thread) = BGP_Start; |
417 | bgp_event(thread); /* bgp_event unlocks peer */ | |
718e3744 | 418 | |
d62a17ae | 419 | return 0; |
718e3744 | 420 | } |
421 | ||
422 | /* BGP connect retry timer. */ | |
d62a17ae | 423 | static int bgp_connect_timer(struct thread *thread) |
718e3744 | 424 | { |
d62a17ae | 425 | struct peer *peer; |
426 | int ret; | |
427 | ||
428 | peer = THREAD_ARG(thread); | |
424ab01d QY |
429 | |
430 | assert(!peer->t_write); | |
431 | assert(!peer->t_read); | |
432 | ||
d62a17ae | 433 | peer->t_connect = NULL; |
434 | ||
435 | if (bgp_debug_neighbor_events(peer)) | |
436 | zlog_debug("%s [FSM] Timer (connect timer expire)", peer->host); | |
437 | ||
438 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) { | |
439 | bgp_stop(peer); | |
440 | ret = -1; | |
441 | } else { | |
442 | THREAD_VAL(thread) = ConnectRetry_timer_expired; | |
443 | bgp_event(thread); /* bgp_event unlocks peer */ | |
444 | ret = 0; | |
445 | } | |
446 | ||
447 | return ret; | |
718e3744 | 448 | } |
449 | ||
450 | /* BGP holdtime timer. */ | |
d62a17ae | 451 | static int bgp_holdtime_timer(struct thread *thread) |
718e3744 | 452 | { |
d62a17ae | 453 | struct peer *peer; |
718e3744 | 454 | |
d62a17ae | 455 | peer = THREAD_ARG(thread); |
456 | peer->t_holdtime = NULL; | |
718e3744 | 457 | |
d62a17ae | 458 | if (bgp_debug_neighbor_events(peer)) |
459 | zlog_debug("%s [FSM] Timer (holdtime timer expire)", | |
460 | peer->host); | |
718e3744 | 461 | |
d62a17ae | 462 | THREAD_VAL(thread) = Hold_Timer_expired; |
463 | bgp_event(thread); /* bgp_event unlocks peer */ | |
718e3744 | 464 | |
d62a17ae | 465 | return 0; |
718e3744 | 466 | } |
467 | ||
d62a17ae | 468 | int bgp_routeadv_timer(struct thread *thread) |
718e3744 | 469 | { |
d62a17ae | 470 | struct peer *peer; |
718e3744 | 471 | |
d62a17ae | 472 | peer = THREAD_ARG(thread); |
473 | peer->t_routeadv = NULL; | |
718e3744 | 474 | |
d62a17ae | 475 | if (bgp_debug_neighbor_events(peer)) |
476 | zlog_debug("%s [FSM] Timer (routeadv timer expire)", | |
477 | peer->host); | |
718e3744 | 478 | |
d62a17ae | 479 | peer->synctime = bgp_clock(); |
718e3744 | 480 | |
a9794991 | 481 | thread_add_timer_msec(bm->master, bgp_generate_updgrp_packets, peer, 0, |
424ab01d QY |
482 | &peer->t_generate_updgrp_packets); |
483 | ||
d62a17ae | 484 | /* MRAI timer will be started again when FIFO is built, no need to |
485 | * do it here. | |
486 | */ | |
487 | return 0; | |
718e3744 | 488 | } |
489 | ||
e0701b79 | 490 | /* BGP Peer Down Cause */ |
d62a17ae | 491 | const char *peer_down_str[] = {"", |
492 | "Router ID changed", | |
493 | "Remote AS changed", | |
494 | "Local AS change", | |
495 | "Cluster ID changed", | |
496 | "Confederation identifier changed", | |
497 | "Confederation peer changed", | |
498 | "RR client config change", | |
499 | "RS client config change", | |
500 | "Update source change", | |
501 | "Address family activated", | |
502 | "Admin. shutdown", | |
503 | "User reset", | |
504 | "BGP Notification received", | |
505 | "BGP Notification send", | |
506 | "Peer closed the session", | |
507 | "Neighbor deleted", | |
508 | "Peer-group add member", | |
509 | "Peer-group delete member", | |
510 | "Capability changed", | |
511 | "Passive config change", | |
512 | "Multihop config change", | |
513 | "NSF peer closed the session", | |
514 | "Intf peering v6only config change", | |
515 | "BFD down received", | |
516 | "Interface down", | |
517 | "Neighbor address lost"}; | |
518 | ||
519 | static int bgp_graceful_restart_timer_expire(struct thread *thread) | |
e0701b79 | 520 | { |
d62a17ae | 521 | struct peer *peer; |
522 | afi_t afi; | |
523 | safi_t safi; | |
524 | ||
525 | peer = THREAD_ARG(thread); | |
526 | peer->t_gr_restart = NULL; | |
527 | ||
528 | /* NSF delete stale route */ | |
529 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 530 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) |
d62a17ae | 531 | if (peer->nsf[afi][safi]) |
532 | bgp_clear_stale_route(peer, afi, safi); | |
533 | ||
534 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
535 | BGP_TIMER_OFF(peer->t_gr_stale); | |
536 | ||
537 | if (bgp_debug_neighbor_events(peer)) { | |
538 | zlog_debug("%s graceful restart timer expired", peer->host); | |
539 | zlog_debug("%s graceful restart stalepath timer stopped", | |
540 | peer->host); | |
541 | } | |
93406d87 | 542 | |
d62a17ae | 543 | bgp_timer_set(peer); |
93406d87 | 544 | |
d62a17ae | 545 | return 0; |
93406d87 | 546 | } |
547 | ||
d62a17ae | 548 | static int bgp_graceful_stale_timer_expire(struct thread *thread) |
93406d87 | 549 | { |
d62a17ae | 550 | struct peer *peer; |
551 | afi_t afi; | |
552 | safi_t safi; | |
93406d87 | 553 | |
d62a17ae | 554 | peer = THREAD_ARG(thread); |
555 | peer->t_gr_stale = NULL; | |
93406d87 | 556 | |
d62a17ae | 557 | if (bgp_debug_neighbor_events(peer)) |
558 | zlog_debug("%s graceful restart stalepath timer expired", | |
559 | peer->host); | |
93406d87 | 560 | |
d62a17ae | 561 | /* NSF delete stale route */ |
562 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 563 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) |
d62a17ae | 564 | if (peer->nsf[afi][safi]) |
565 | bgp_clear_stale_route(peer, afi, safi); | |
93406d87 | 566 | |
d62a17ae | 567 | return 0; |
93406d87 | 568 | } |
569 | ||
d62a17ae | 570 | static int bgp_update_delay_applicable(struct bgp *bgp) |
f188f2c4 | 571 | { |
d62a17ae | 572 | /* update_delay_over flag should be reset (set to 0) for any new |
573 | applicability of the update-delay during BGP process lifetime. | |
574 | And it should be set after an occurence of the update-delay is | |
575 | over)*/ | |
576 | if (!bgp->update_delay_over) | |
577 | return 1; | |
578 | ||
579 | return 0; | |
f188f2c4 DS |
580 | } |
581 | ||
d62a17ae | 582 | int bgp_update_delay_active(struct bgp *bgp) |
f188f2c4 | 583 | { |
d62a17ae | 584 | if (bgp->t_update_delay) |
585 | return 1; | |
f188f2c4 | 586 | |
d62a17ae | 587 | return 0; |
f188f2c4 DS |
588 | } |
589 | ||
d62a17ae | 590 | int bgp_update_delay_configured(struct bgp *bgp) |
f188f2c4 | 591 | { |
d62a17ae | 592 | if (bgp->v_update_delay) |
593 | return 1; | |
f188f2c4 | 594 | |
d62a17ae | 595 | return 0; |
f188f2c4 DS |
596 | } |
597 | ||
598 | /* Do the post-processing needed when bgp comes out of the read-only mode | |
599 | on ending the update delay. */ | |
d62a17ae | 600 | void bgp_update_delay_end(struct bgp *bgp) |
f188f2c4 | 601 | { |
d62a17ae | 602 | THREAD_TIMER_OFF(bgp->t_update_delay); |
603 | THREAD_TIMER_OFF(bgp->t_establish_wait); | |
604 | ||
605 | /* Reset update-delay related state */ | |
606 | bgp->update_delay_over = 1; | |
607 | bgp->established = 0; | |
608 | bgp->restarted_peers = 0; | |
609 | bgp->implicit_eors = 0; | |
610 | bgp->explicit_eors = 0; | |
611 | ||
612 | quagga_timestamp(3, bgp->update_delay_end_time, | |
613 | sizeof(bgp->update_delay_end_time)); | |
614 | ||
615 | /* | |
616 | * Add an end-of-initial-update marker to the main process queues so | |
617 | * that | |
618 | * the route advertisement timer for the peers can be started. Also set | |
619 | * the zebra and peer update hold flags. These flags are used to achieve | |
620 | * three stages in the update-delay post processing: | |
621 | * 1. Finish best-path selection for all the prefixes held on the | |
622 | * queues. | |
623 | * (routes in BGP are updated, and peers sync queues are populated | |
624 | * too) | |
625 | * 2. As the eoiu mark is reached in the bgp process routine, ship all | |
626 | * the | |
627 | * routes to zebra. With that zebra should see updates from BGP | |
628 | * close | |
629 | * to each other. | |
630 | * 3. Unblock the peer update writes. With that peer update packing | |
631 | * with | |
632 | * the prefixes should be at its maximum. | |
633 | */ | |
634 | bgp_add_eoiu_mark(bgp); | |
635 | bgp->main_zebra_update_hold = 1; | |
636 | bgp->main_peers_update_hold = 1; | |
637 | ||
638 | /* Resume the queue processing. This should trigger the event that would | |
639 | take | |
640 | care of processing any work that was queued during the read-only | |
641 | mode. */ | |
642 | work_queue_unplug(bm->process_main_queue); | |
f188f2c4 DS |
643 | } |
644 | ||
cb1faec9 DS |
645 | /** |
646 | * see bgp_fsm.h | |
647 | */ | |
d62a17ae | 648 | void bgp_start_routeadv(struct bgp *bgp) |
cb1faec9 | 649 | { |
d62a17ae | 650 | struct listnode *node, *nnode; |
651 | struct peer *peer; | |
cb1faec9 | 652 | |
d62a17ae | 653 | zlog_info("bgp_start_routeadv(), update hold status %d", |
654 | bgp->main_peers_update_hold); | |
4a16ae86 | 655 | |
d62a17ae | 656 | if (bgp->main_peers_update_hold) |
657 | return; | |
4a16ae86 | 658 | |
d62a17ae | 659 | quagga_timestamp(3, bgp->update_delay_peers_resume_time, |
660 | sizeof(bgp->update_delay_peers_resume_time)); | |
4a16ae86 | 661 | |
d62a17ae | 662 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) { |
663 | if (peer->status != Established) | |
664 | continue; | |
665 | BGP_TIMER_OFF(peer->t_routeadv); | |
666 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
667 | } | |
cb1faec9 DS |
668 | } |
669 | ||
670 | /** | |
671 | * see bgp_fsm.h | |
672 | */ | |
d62a17ae | 673 | void bgp_adjust_routeadv(struct peer *peer) |
cb1faec9 | 674 | { |
d62a17ae | 675 | time_t nowtime = bgp_clock(); |
676 | double diff; | |
677 | unsigned long remain; | |
678 | ||
679 | /* Bypass checks for special case of MRAI being 0 */ | |
680 | if (peer->v_routeadv == 0) { | |
681 | /* Stop existing timer, just in case it is running for a | |
682 | * different | |
683 | * duration and schedule write thread immediately. | |
684 | */ | |
685 | if (peer->t_routeadv) | |
686 | BGP_TIMER_OFF(peer->t_routeadv); | |
687 | ||
688 | peer->synctime = bgp_clock(); | |
a9794991 | 689 | thread_add_timer_msec(bm->master, bgp_generate_updgrp_packets, |
424ab01d QY |
690 | peer, 0, |
691 | &peer->t_generate_updgrp_packets); | |
d62a17ae | 692 | return; |
693 | } | |
694 | ||
695 | ||
696 | /* | |
697 | * CASE I: | |
698 | * If the last update was written more than MRAI back, expire the timer | |
699 | * instantly so that we can send the update out sooner. | |
700 | * | |
701 | * <------- MRAI ---------> | |
702 | * |-----------------|-----------------------| | |
703 | * <------------- m ------------> | |
704 | * ^ ^ ^ | |
705 | * | | | | |
706 | * | | current time | |
707 | * | timer start | |
708 | * last write | |
709 | * | |
710 | * m > MRAI | |
711 | */ | |
712 | diff = difftime(nowtime, peer->last_update); | |
713 | if (diff > (double)peer->v_routeadv) { | |
714 | BGP_TIMER_OFF(peer->t_routeadv); | |
715 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
716 | return; | |
717 | } | |
718 | ||
719 | /* | |
720 | * CASE II: | |
721 | * - Find when to expire the MRAI timer. | |
722 | * If MRAI timer is not active, assume we can start it now. | |
723 | * | |
724 | * <------- MRAI ---------> | |
725 | * |------------|-----------------------| | |
726 | * <-------- m ----------><----- r -----> | |
727 | * ^ ^ ^ | |
728 | * | | | | |
729 | * | | current time | |
730 | * | timer start | |
731 | * last write | |
732 | * | |
733 | * (MRAI - m) < r | |
734 | */ | |
735 | if (peer->t_routeadv) | |
736 | remain = thread_timer_remain_second(peer->t_routeadv); | |
737 | else | |
738 | remain = peer->v_routeadv; | |
739 | diff = peer->v_routeadv - diff; | |
740 | if (diff <= (double)remain) { | |
741 | BGP_TIMER_OFF(peer->t_routeadv); | |
742 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, diff); | |
743 | } | |
cb1faec9 DS |
744 | } |
745 | ||
d62a17ae | 746 | static int bgp_maxmed_onstartup_applicable(struct bgp *bgp) |
abc920f8 | 747 | { |
d62a17ae | 748 | if (!bgp->maxmed_onstartup_over) |
749 | return 1; | |
abc920f8 | 750 | |
d62a17ae | 751 | return 0; |
abc920f8 DS |
752 | } |
753 | ||
d62a17ae | 754 | int bgp_maxmed_onstartup_configured(struct bgp *bgp) |
abc920f8 | 755 | { |
d62a17ae | 756 | if (bgp->v_maxmed_onstartup != BGP_MAXMED_ONSTARTUP_UNCONFIGURED) |
757 | return 1; | |
abc920f8 | 758 | |
d62a17ae | 759 | return 0; |
abc920f8 DS |
760 | } |
761 | ||
d62a17ae | 762 | int bgp_maxmed_onstartup_active(struct bgp *bgp) |
abc920f8 | 763 | { |
d62a17ae | 764 | if (bgp->t_maxmed_onstartup) |
765 | return 1; | |
abc920f8 | 766 | |
d62a17ae | 767 | return 0; |
abc920f8 DS |
768 | } |
769 | ||
d62a17ae | 770 | void bgp_maxmed_update(struct bgp *bgp) |
abc920f8 | 771 | { |
d7c0a89a QY |
772 | uint8_t maxmed_active; |
773 | uint32_t maxmed_value; | |
d62a17ae | 774 | |
775 | if (bgp->v_maxmed_admin) { | |
776 | maxmed_active = 1; | |
777 | maxmed_value = bgp->maxmed_admin_value; | |
778 | } else if (bgp->t_maxmed_onstartup) { | |
779 | maxmed_active = 1; | |
780 | maxmed_value = bgp->maxmed_onstartup_value; | |
781 | } else { | |
782 | maxmed_active = 0; | |
783 | maxmed_value = BGP_MAXMED_VALUE_DEFAULT; | |
784 | } | |
785 | ||
786 | if (bgp->maxmed_active != maxmed_active | |
787 | || bgp->maxmed_value != maxmed_value) { | |
788 | bgp->maxmed_active = maxmed_active; | |
789 | bgp->maxmed_value = maxmed_value; | |
790 | ||
791 | update_group_announce(bgp); | |
792 | } | |
abc920f8 DS |
793 | } |
794 | ||
795 | /* The maxmed onstartup timer expiry callback. */ | |
d62a17ae | 796 | static int bgp_maxmed_onstartup_timer(struct thread *thread) |
abc920f8 | 797 | { |
d62a17ae | 798 | struct bgp *bgp; |
abc920f8 | 799 | |
d62a17ae | 800 | zlog_info("Max med on startup ended - timer expired."); |
abc920f8 | 801 | |
d62a17ae | 802 | bgp = THREAD_ARG(thread); |
803 | THREAD_TIMER_OFF(bgp->t_maxmed_onstartup); | |
804 | bgp->maxmed_onstartup_over = 1; | |
abc920f8 | 805 | |
d62a17ae | 806 | bgp_maxmed_update(bgp); |
abc920f8 | 807 | |
d62a17ae | 808 | return 0; |
abc920f8 DS |
809 | } |
810 | ||
d62a17ae | 811 | static void bgp_maxmed_onstartup_begin(struct bgp *bgp) |
abc920f8 | 812 | { |
d62a17ae | 813 | /* Applicable only once in the process lifetime on the startup */ |
814 | if (bgp->maxmed_onstartup_over) | |
815 | return; | |
abc920f8 | 816 | |
d62a17ae | 817 | zlog_info("Begin maxmed onstartup mode - timer %d seconds", |
818 | bgp->v_maxmed_onstartup); | |
abc920f8 | 819 | |
d62a17ae | 820 | thread_add_timer(bm->master, bgp_maxmed_onstartup_timer, bgp, |
821 | bgp->v_maxmed_onstartup, &bgp->t_maxmed_onstartup); | |
abc920f8 | 822 | |
d62a17ae | 823 | if (!bgp->v_maxmed_admin) { |
824 | bgp->maxmed_active = 1; | |
825 | bgp->maxmed_value = bgp->maxmed_onstartup_value; | |
826 | } | |
abc920f8 | 827 | |
d62a17ae | 828 | /* Route announce to all peers should happen after this in |
829 | * bgp_establish() */ | |
abc920f8 DS |
830 | } |
831 | ||
d62a17ae | 832 | static void bgp_maxmed_onstartup_process_status_change(struct peer *peer) |
abc920f8 | 833 | { |
d62a17ae | 834 | if (peer->status == Established && !peer->bgp->established) { |
835 | bgp_maxmed_onstartup_begin(peer->bgp); | |
836 | } | |
abc920f8 DS |
837 | } |
838 | ||
f188f2c4 | 839 | /* The update delay timer expiry callback. */ |
d62a17ae | 840 | static int bgp_update_delay_timer(struct thread *thread) |
f188f2c4 | 841 | { |
d62a17ae | 842 | struct bgp *bgp; |
f188f2c4 | 843 | |
d62a17ae | 844 | zlog_info("Update delay ended - timer expired."); |
f188f2c4 | 845 | |
d62a17ae | 846 | bgp = THREAD_ARG(thread); |
847 | THREAD_TIMER_OFF(bgp->t_update_delay); | |
848 | bgp_update_delay_end(bgp); | |
f188f2c4 | 849 | |
d62a17ae | 850 | return 0; |
f188f2c4 DS |
851 | } |
852 | ||
853 | /* The establish wait timer expiry callback. */ | |
d62a17ae | 854 | static int bgp_establish_wait_timer(struct thread *thread) |
f188f2c4 | 855 | { |
d62a17ae | 856 | struct bgp *bgp; |
f188f2c4 | 857 | |
d62a17ae | 858 | zlog_info("Establish wait - timer expired."); |
f188f2c4 | 859 | |
d62a17ae | 860 | bgp = THREAD_ARG(thread); |
861 | THREAD_TIMER_OFF(bgp->t_establish_wait); | |
862 | bgp_check_update_delay(bgp); | |
f188f2c4 | 863 | |
d62a17ae | 864 | return 0; |
f188f2c4 DS |
865 | } |
866 | ||
867 | /* Steps to begin the update delay: | |
868 | - initialize queues if needed | |
869 | - stop the queue processing | |
870 | - start the timer */ | |
d62a17ae | 871 | static void bgp_update_delay_begin(struct bgp *bgp) |
f188f2c4 | 872 | { |
d62a17ae | 873 | struct listnode *node, *nnode; |
874 | struct peer *peer; | |
f188f2c4 | 875 | |
d62a17ae | 876 | /* Stop the processing of queued work. Enqueue shall continue */ |
877 | work_queue_plug(bm->process_main_queue); | |
f188f2c4 | 878 | |
d62a17ae | 879 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) |
880 | peer->update_delay_over = 0; | |
f188f2c4 | 881 | |
d62a17ae | 882 | /* Start the update-delay timer */ |
883 | thread_add_timer(bm->master, bgp_update_delay_timer, bgp, | |
884 | bgp->v_update_delay, &bgp->t_update_delay); | |
f188f2c4 | 885 | |
d62a17ae | 886 | if (bgp->v_establish_wait != bgp->v_update_delay) |
887 | thread_add_timer(bm->master, bgp_establish_wait_timer, bgp, | |
888 | bgp->v_establish_wait, &bgp->t_establish_wait); | |
f188f2c4 | 889 | |
d62a17ae | 890 | quagga_timestamp(3, bgp->update_delay_begin_time, |
891 | sizeof(bgp->update_delay_begin_time)); | |
f188f2c4 DS |
892 | } |
893 | ||
d62a17ae | 894 | static void bgp_update_delay_process_status_change(struct peer *peer) |
f188f2c4 | 895 | { |
d62a17ae | 896 | if (peer->status == Established) { |
897 | if (!peer->bgp->established++) { | |
898 | bgp_update_delay_begin(peer->bgp); | |
899 | zlog_info( | |
900 | "Begin read-only mode - update-delay timer %d seconds", | |
901 | peer->bgp->v_update_delay); | |
902 | } | |
903 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_BIT_RCV)) | |
904 | bgp_update_restarted_peers(peer); | |
905 | } | |
906 | if (peer->ostatus == Established | |
907 | && bgp_update_delay_active(peer->bgp)) { | |
908 | /* Adjust the update-delay state to account for this flap. | |
909 | NOTE: Intentionally skipping adjusting implicit_eors or | |
910 | explicit_eors | |
911 | counters. Extra sanity check in bgp_check_update_delay() | |
912 | should | |
913 | be enough to take care of any additive discrepancy in bgp eor | |
914 | counters */ | |
915 | peer->bgp->established--; | |
916 | peer->update_delay_over = 0; | |
917 | } | |
f188f2c4 DS |
918 | } |
919 | ||
4e69658c | 920 | /* Called after event occurred, this function change status and reset |
200df115 | 921 | read/write and timer thread. */ |
d62a17ae | 922 | void bgp_fsm_change_status(struct peer *peer, int status) |
200df115 | 923 | { |
1ff9a340 | 924 | |
d62a17ae | 925 | bgp_dump_state(peer, peer->status, status); |
926 | ||
927 | /* Transition into Clearing or Deleted must /always/ clear all routes.. | |
928 | * (and must do so before actually changing into Deleted.. | |
929 | */ | |
930 | if (status >= Clearing) { | |
931 | bgp_clear_route_all(peer); | |
932 | ||
933 | /* If no route was queued for the clear-node processing, | |
934 | * generate the | |
935 | * completion event here. This is needed because if there are no | |
936 | * routes | |
937 | * to trigger the background clear-node thread, the event won't | |
938 | * get | |
939 | * generated and the peer would be stuck in Clearing. Note that | |
940 | * this | |
941 | * event is for the peer and helps the peer transition out of | |
942 | * Clearing | |
943 | * state; it should not be generated per (AFI,SAFI). The event | |
944 | * is | |
945 | * directly posted here without calling clear_node_complete() as | |
946 | * we | |
947 | * shouldn't do an extra unlock. This event will get processed | |
948 | * after | |
949 | * the state change that happens below, so peer will be in | |
950 | * Clearing | |
951 | * (or Deleted). | |
952 | */ | |
953 | if (!work_queue_is_scheduled(peer->clear_node_queue)) | |
954 | BGP_EVENT_ADD(peer, Clearing_Completed); | |
955 | } | |
956 | ||
957 | /* Preserve old status and change into new status. */ | |
958 | peer->ostatus = peer->status; | |
959 | peer->status = status; | |
960 | ||
961 | /* Save event that caused status change. */ | |
962 | peer->last_major_event = peer->cur_event; | |
963 | ||
964 | if (status == Established) | |
965 | UNSET_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER); | |
966 | ||
967 | /* If max-med processing is applicable, do the necessary. */ | |
968 | if (status == Established) { | |
969 | if (bgp_maxmed_onstartup_configured(peer->bgp) | |
970 | && bgp_maxmed_onstartup_applicable(peer->bgp)) | |
971 | bgp_maxmed_onstartup_process_status_change(peer); | |
972 | else | |
973 | peer->bgp->maxmed_onstartup_over = 1; | |
974 | } | |
975 | ||
976 | /* If update-delay processing is applicable, do the necessary. */ | |
977 | if (bgp_update_delay_configured(peer->bgp) | |
978 | && bgp_update_delay_applicable(peer->bgp)) | |
979 | bgp_update_delay_process_status_change(peer); | |
980 | ||
981 | if (bgp_debug_neighbor_events(peer)) | |
982 | zlog_debug("%s went from %s to %s", peer->host, | |
983 | lookup_msg(bgp_status_msg, peer->ostatus, NULL), | |
984 | lookup_msg(bgp_status_msg, peer->status, NULL)); | |
200df115 | 985 | } |
986 | ||
3117b5c4 | 987 | /* Flush the event queue and ensure the peer is shut down */ |
d62a17ae | 988 | static int bgp_clearing_completed(struct peer *peer) |
3117b5c4 | 989 | { |
d62a17ae | 990 | int rc = bgp_stop(peer); |
1ff9a340 | 991 | |
d62a17ae | 992 | if (rc >= 0) |
993 | BGP_EVENT_FLUSH(peer); | |
3117b5c4 | 994 | |
d62a17ae | 995 | return rc; |
3117b5c4 SH |
996 | } |
997 | ||
718e3744 | 998 | /* Administrative BGP peer stop event. */ |
3117b5c4 | 999 | /* May be called multiple times for the same peer */ |
d62a17ae | 1000 | int bgp_stop(struct peer *peer) |
718e3744 | 1001 | { |
d62a17ae | 1002 | afi_t afi; |
1003 | safi_t safi; | |
1004 | char orf_name[BUFSIZ]; | |
1005 | int ret = 0; | |
1006 | ||
1007 | if (peer_dynamic_neighbor(peer) | |
1008 | && !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
1009 | if (bgp_debug_neighbor_events(peer)) | |
1010 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1011 | peer_delete(peer); | |
1012 | return -1; | |
c22767d8 | 1013 | } |
848973c7 | 1014 | |
d62a17ae | 1015 | /* Can't do this in Clearing; events are used for state transitions */ |
1016 | if (peer->status != Clearing) { | |
1017 | /* Delete all existing events of the peer */ | |
1018 | BGP_EVENT_FLUSH(peer); | |
93406d87 | 1019 | } |
d62a17ae | 1020 | |
1021 | /* Increment Dropped count. */ | |
1022 | if (peer->status == Established) { | |
1023 | peer->dropped++; | |
1024 | ||
1025 | /* bgp log-neighbor-changes of neighbor Down */ | |
1026 | if (bgp_flag_check(peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { | |
1027 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); | |
1028 | zlog_info( | |
1029 | "%%ADJCHANGE: neighbor %s(%s) in vrf %s Down %s", | |
1030 | peer->host, | |
1031 | (peer->hostname) ? peer->hostname : "Unknown", | |
1032 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) ? vrf->name | |
1033 | : "Default") | |
1034 | : "", | |
1035 | peer_down_str[(int)peer->last_reset]); | |
1036 | } | |
1037 | ||
1038 | /* graceful restart */ | |
1039 | if (peer->t_gr_stale) { | |
1040 | BGP_TIMER_OFF(peer->t_gr_stale); | |
1041 | if (bgp_debug_neighbor_events(peer)) | |
1042 | zlog_debug( | |
1043 | "%s graceful restart stalepath timer stopped", | |
1044 | peer->host); | |
1045 | } | |
1046 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
1047 | if (bgp_debug_neighbor_events(peer)) { | |
1048 | zlog_debug( | |
1049 | "%s graceful restart timer started for %d sec", | |
1050 | peer->host, peer->v_gr_restart); | |
1051 | zlog_debug( | |
1052 | "%s graceful restart stalepath timer started for %d sec", | |
1053 | peer->host, peer->bgp->stalepath_time); | |
1054 | } | |
1055 | BGP_TIMER_ON(peer->t_gr_restart, | |
1056 | bgp_graceful_restart_timer_expire, | |
1057 | peer->v_gr_restart); | |
1058 | BGP_TIMER_ON(peer->t_gr_stale, | |
1059 | bgp_graceful_stale_timer_expire, | |
1060 | peer->bgp->stalepath_time); | |
1061 | } else { | |
1062 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1063 | ||
1064 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
996c9314 LB |
1065 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; |
1066 | safi++) | |
d62a17ae | 1067 | peer->nsf[afi][safi] = 0; |
1068 | } | |
1069 | ||
1070 | /* set last reset time */ | |
1071 | peer->resettime = peer->uptime = bgp_clock(); | |
1072 | ||
1073 | if (BGP_DEBUG(update_groups, UPDATE_GROUPS)) | |
1074 | zlog_debug("%s remove from all update group", | |
1075 | peer->host); | |
1076 | update_group_remove_peer_afs(peer); | |
1077 | ||
1078 | hook_call(peer_backward_transition, peer); | |
1079 | ||
1080 | /* Reset peer synctime */ | |
1081 | peer->synctime = 0; | |
1082 | ||
1083 | bgp_bfd_deregister_peer(peer); | |
93406d87 | 1084 | } |
93406d87 | 1085 | |
424ab01d | 1086 | /* stop keepalives */ |
b72b6f4f | 1087 | bgp_keepalives_off(peer); |
424ab01d QY |
1088 | |
1089 | /* Stop read and write threads. */ | |
1090 | bgp_writes_off(peer); | |
1091 | bgp_reads_off(peer); | |
1092 | ||
387f984e QY |
1093 | THREAD_OFF(peer->t_connect_check_r); |
1094 | THREAD_OFF(peer->t_connect_check_w); | |
d62a17ae | 1095 | |
1096 | /* Stop all timers. */ | |
1097 | BGP_TIMER_OFF(peer->t_start); | |
1098 | BGP_TIMER_OFF(peer->t_connect); | |
1099 | BGP_TIMER_OFF(peer->t_holdtime); | |
d62a17ae | 1100 | BGP_TIMER_OFF(peer->t_routeadv); |
d62a17ae | 1101 | |
1102 | /* Clear input and output buffer. */ | |
424ab01d | 1103 | pthread_mutex_lock(&peer->io_mtx); |
d3ecc69e | 1104 | { |
424ab01d QY |
1105 | if (peer->ibuf) |
1106 | stream_fifo_clean(peer->ibuf); | |
d3ecc69e QY |
1107 | if (peer->obuf) |
1108 | stream_fifo_clean(peer->obuf); | |
424ab01d QY |
1109 | |
1110 | if (peer->ibuf_work) | |
74ffbfe6 | 1111 | ringbuf_wipe(peer->ibuf_work); |
424ab01d QY |
1112 | if (peer->obuf_work) |
1113 | stream_reset(peer->obuf_work); | |
1114 | ||
1115 | if (peer->curr) { | |
1116 | stream_free(peer->curr); | |
1117 | peer->curr = NULL; | |
1118 | } | |
d3ecc69e | 1119 | } |
424ab01d | 1120 | pthread_mutex_unlock(&peer->io_mtx); |
d62a17ae | 1121 | |
1122 | /* Close of file descriptor. */ | |
1123 | if (peer->fd >= 0) { | |
1124 | close(peer->fd); | |
1125 | peer->fd = -1; | |
93406d87 | 1126 | } |
1127 | ||
05c7a1cc QY |
1128 | FOREACH_AFI_SAFI (afi, safi) { |
1129 | /* Reset all negotiated variables */ | |
1130 | peer->afc_nego[afi][safi] = 0; | |
1131 | peer->afc_adv[afi][safi] = 0; | |
1132 | peer->afc_recv[afi][safi] = 0; | |
1133 | ||
1134 | /* peer address family capability flags*/ | |
1135 | peer->af_cap[afi][safi] = 0; | |
1136 | ||
1137 | /* peer address family status flags*/ | |
1138 | peer->af_sflags[afi][safi] = 0; | |
1139 | ||
1140 | /* Received ORF prefix-filter */ | |
1141 | peer->orf_plist[afi][safi] = NULL; | |
1142 | ||
1143 | if ((peer->status == OpenConfirm) | |
1144 | || (peer->status == Established)) { | |
1145 | /* ORF received prefix-filter pnt */ | |
1146 | sprintf(orf_name, "%s.%d.%d", peer->host, afi, safi); | |
1147 | prefix_bgp_orf_remove_all(afi, orf_name); | |
d62a17ae | 1148 | } |
05c7a1cc | 1149 | } |
d62a17ae | 1150 | |
1151 | /* Reset keepalive and holdtime */ | |
b90a8e13 | 1152 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER)) { |
d62a17ae | 1153 | peer->v_keepalive = peer->keepalive; |
1154 | peer->v_holdtime = peer->holdtime; | |
1155 | } else { | |
1156 | peer->v_keepalive = peer->bgp->default_keepalive; | |
1157 | peer->v_holdtime = peer->bgp->default_holdtime; | |
1ff9a340 | 1158 | } |
d62a17ae | 1159 | |
1160 | peer->update_time = 0; | |
1161 | ||
1162 | /* Until we are sure that there is no problem about prefix count | |
1163 | this should be commented out.*/ | |
718e3744 | 1164 | #if 0 |
1165 | /* Reset prefix count */ | |
1166 | peer->pcount[AFI_IP][SAFI_UNICAST] = 0; | |
1167 | peer->pcount[AFI_IP][SAFI_MULTICAST] = 0; | |
cd1964ff | 1168 | peer->pcount[AFI_IP][SAFI_LABELED_UNICAST] = 0; |
718e3744 | 1169 | peer->pcount[AFI_IP][SAFI_MPLS_VPN] = 0; |
1170 | peer->pcount[AFI_IP6][SAFI_UNICAST] = 0; | |
1171 | peer->pcount[AFI_IP6][SAFI_MULTICAST] = 0; | |
cd1964ff | 1172 | peer->pcount[AFI_IP6][SAFI_LABELED_UNICAST] = 0; |
718e3744 | 1173 | #endif /* 0 */ |
1174 | ||
d62a17ae | 1175 | if (!CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE) |
1176 | && !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
1177 | peer_delete(peer); | |
1178 | ret = -1; | |
1179 | } else { | |
1180 | bgp_peer_conf_if_to_su_update(peer); | |
1181 | } | |
1182 | ||
1183 | return ret; | |
718e3744 | 1184 | } |
1185 | ||
1186 | /* BGP peer is stoped by the error. */ | |
d62a17ae | 1187 | static int bgp_stop_with_error(struct peer *peer) |
718e3744 | 1188 | { |
d62a17ae | 1189 | /* Double start timer. */ |
1190 | peer->v_start *= 2; | |
1191 | ||
1192 | /* Overflow check. */ | |
1193 | if (peer->v_start >= (60 * 2)) | |
1194 | peer->v_start = (60 * 2); | |
1195 | ||
1196 | if (peer_dynamic_neighbor(peer)) { | |
1197 | if (bgp_debug_neighbor_events(peer)) | |
1198 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1199 | peer_delete(peer); | |
1200 | return -1; | |
1201 | } | |
1202 | ||
1203 | return (bgp_stop(peer)); | |
718e3744 | 1204 | } |
1205 | ||
397b5bde LR |
1206 | |
1207 | /* something went wrong, send notify and tear down */ | |
d7c0a89a QY |
1208 | static int bgp_stop_with_notify(struct peer *peer, uint8_t code, |
1209 | uint8_t sub_code) | |
397b5bde | 1210 | { |
d62a17ae | 1211 | /* Send notify to remote peer */ |
1212 | bgp_notify_send(peer, code, sub_code); | |
1213 | ||
1214 | if (peer_dynamic_neighbor(peer)) { | |
1215 | if (bgp_debug_neighbor_events(peer)) | |
1216 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1217 | peer_delete(peer); | |
1218 | return -1; | |
1219 | } | |
f14e6fdb | 1220 | |
d62a17ae | 1221 | /* Clear start timer value to default. */ |
1222 | peer->v_start = BGP_INIT_START_TIMER; | |
397b5bde | 1223 | |
d62a17ae | 1224 | return (bgp_stop(peer)); |
397b5bde LR |
1225 | } |
1226 | ||
07a16526 QY |
1227 | /** |
1228 | * Determines whether a TCP session has successfully established for a peer and | |
1229 | * events as appropriate. | |
1230 | * | |
1231 | * This function is called when setting up a new session. After connect() is | |
387f984e QY |
1232 | * called on the peer's socket (in bgp_start()), the fd is passed to poll() |
1233 | * to wait for connection success or failure. When poll() returns, this | |
07a16526 | 1234 | * function is called to evaluate the result. |
387f984e QY |
1235 | * |
1236 | * Due to differences in behavior of poll() on Linux and BSD - specifically, | |
1237 | * the value of .revents in the case of a closed connection - this function is | |
1238 | * scheduled both for a read and a write event. The write event is triggered | |
1239 | * when the connection is established. A read event is triggered when the | |
1240 | * connection is closed. Thus we need to cancel whichever one did not occur. | |
07a16526 QY |
1241 | */ |
1242 | static int bgp_connect_check(struct thread *thread) | |
1243 | { | |
1244 | int status; | |
1245 | socklen_t slen; | |
1246 | int ret; | |
1247 | struct peer *peer; | |
1248 | ||
1249 | peer = THREAD_ARG(thread); | |
424ab01d QY |
1250 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); |
1251 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); | |
1252 | assert(!peer->t_read); | |
1253 | assert(!peer->t_write); | |
07a16526 | 1254 | |
387f984e QY |
1255 | THREAD_OFF(peer->t_connect_check_r); |
1256 | THREAD_OFF(peer->t_connect_check_w); | |
dc1188bb | 1257 | |
07a16526 QY |
1258 | /* Check file descriptor. */ |
1259 | slen = sizeof(status); | |
1260 | ret = getsockopt(peer->fd, SOL_SOCKET, SO_ERROR, (void *)&status, | |
1261 | &slen); | |
1262 | ||
1263 | /* If getsockopt is fail, this is fatal error. */ | |
1264 | if (ret < 0) { | |
54ff5e9b DS |
1265 | zlog_info("can't get sockopt for nonblocking connect: %d(%s)", |
1266 | errno, safe_strerror(errno)); | |
07a16526 QY |
1267 | BGP_EVENT_ADD(peer, TCP_fatal_error); |
1268 | return -1; | |
1269 | } | |
1270 | ||
1271 | /* When status is 0 then TCP connection is established. */ | |
1272 | if (status == 0) { | |
1273 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
1274 | return 1; | |
1275 | } else { | |
1276 | if (bgp_debug_neighbor_events(peer)) | |
54ff5e9b DS |
1277 | zlog_debug("%s [Event] Connect failed %d(%s)", |
1278 | peer->host, status, safe_strerror(status)); | |
07a16526 QY |
1279 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); |
1280 | return 0; | |
1281 | } | |
1282 | } | |
397b5bde | 1283 | |
718e3744 | 1284 | /* TCP connection open. Next we send open message to remote peer. And |
1285 | add read thread for reading open message. */ | |
d62a17ae | 1286 | static int bgp_connect_success(struct peer *peer) |
718e3744 | 1287 | { |
d62a17ae | 1288 | if (peer->fd < 0) { |
af4c2728 | 1289 | flog_err(BGP_ERR_CONNECT, |
14454c9f DS |
1290 | "bgp_connect_success peer's fd is negative value %d", |
1291 | peer->fd); | |
d62a17ae | 1292 | bgp_stop(peer); |
1293 | return -1; | |
1294 | } | |
1295 | ||
1296 | if (bgp_getsockname(peer) < 0) { | |
09c866e3 QY |
1297 | flog_err_sys(LIB_ERR_SOCKET, |
1298 | "%s: bgp_getsockname(): failed for peer %s, fd %d", | |
1299 | __FUNCTION__, peer->host, peer->fd); | |
d62a17ae | 1300 | bgp_notify_send(peer, BGP_NOTIFY_FSM_ERR, |
1301 | 0); /* internal error */ | |
424ab01d | 1302 | bgp_writes_on(peer); |
d62a17ae | 1303 | return -1; |
1304 | } | |
1305 | ||
424ab01d | 1306 | bgp_reads_on(peer); |
d62a17ae | 1307 | |
1308 | if (bgp_debug_neighbor_events(peer)) { | |
1309 | char buf1[SU_ADDRSTRLEN]; | |
1310 | ||
1311 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) | |
1312 | zlog_debug("%s open active, local address %s", | |
1313 | peer->host, | |
1314 | sockunion2str(peer->su_local, buf1, | |
1315 | SU_ADDRSTRLEN)); | |
1316 | else | |
1317 | zlog_debug("%s passive open", peer->host); | |
1318 | } | |
1319 | ||
1320 | bgp_open_send(peer); | |
1321 | ||
1322 | return 0; | |
718e3744 | 1323 | } |
1324 | ||
1325 | /* TCP connect fail */ | |
d62a17ae | 1326 | static int bgp_connect_fail(struct peer *peer) |
718e3744 | 1327 | { |
d62a17ae | 1328 | if (peer_dynamic_neighbor(peer)) { |
1329 | if (bgp_debug_neighbor_events(peer)) | |
1330 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1331 | peer_delete(peer); | |
1332 | return -1; | |
1333 | } | |
1334 | ||
1335 | return (bgp_stop(peer)); | |
718e3744 | 1336 | } |
1337 | ||
1338 | /* This function is the first starting point of all BGP connection. It | |
1339 | try to connect to remote peer with non-blocking IO. */ | |
d62a17ae | 1340 | int bgp_start(struct peer *peer) |
718e3744 | 1341 | { |
d62a17ae | 1342 | int status; |
1343 | int connected = 0; | |
1344 | ||
1345 | bgp_peer_conf_if_to_su_update(peer); | |
1346 | ||
1347 | if (peer->su.sa.sa_family == AF_UNSPEC) { | |
1348 | if (bgp_debug_neighbor_events(peer)) | |
1349 | zlog_debug( | |
1350 | "%s [FSM] Unable to get neighbor's IP address, waiting...", | |
1351 | peer->host); | |
1352 | return -1; | |
1353 | } | |
1354 | ||
1355 | if (BGP_PEER_START_SUPPRESSED(peer)) { | |
1356 | if (bgp_debug_neighbor_events(peer)) | |
af4c2728 | 1357 | flog_err(BGP_ERR_FSM, |
14454c9f DS |
1358 | "%s [FSM] Trying to start suppressed peer" |
1359 | " - this is never supposed to happen!", | |
1360 | peer->host); | |
d62a17ae | 1361 | return -1; |
1362 | } | |
1363 | ||
1364 | /* Scrub some information that might be left over from a previous, | |
1365 | * session | |
1366 | */ | |
1367 | /* Connection information. */ | |
1368 | if (peer->su_local) { | |
1369 | sockunion_free(peer->su_local); | |
1370 | peer->su_local = NULL; | |
1371 | } | |
1372 | ||
1373 | if (peer->su_remote) { | |
1374 | sockunion_free(peer->su_remote); | |
1375 | peer->su_remote = NULL; | |
1376 | } | |
1377 | ||
1378 | /* Clear remote router-id. */ | |
1379 | peer->remote_id.s_addr = 0; | |
1380 | ||
1381 | /* Clear peer capability flag. */ | |
1382 | peer->cap = 0; | |
1383 | ||
1384 | /* If the peer is passive mode, force to move to Active mode. */ | |
1385 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE)) { | |
1386 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1387 | return 0; | |
1388 | } | |
1389 | ||
5410015a | 1390 | if (peer->bgp->vrf_id == VRF_UNKNOWN) { |
61cf4b37 | 1391 | if (bgp_debug_neighbor_events(peer)) |
af4c2728 | 1392 | flog_err( |
14454c9f | 1393 | BGP_ERR_FSM, |
996c9314 LB |
1394 | "%s [FSM] In a VRF that is not initialised yet", |
1395 | peer->host); | |
61cf4b37 PG |
1396 | return -1; |
1397 | } | |
1398 | ||
d62a17ae | 1399 | /* Register to be notified on peer up */ |
1400 | if (peer->sort == BGP_PEER_EBGP && peer->ttl == 1 | |
1401 | && !CHECK_FLAG(peer->flags, PEER_FLAG_DISABLE_CONNECTED_CHECK) | |
1402 | && !bgp_flag_check(peer->bgp, BGP_FLAG_DISABLE_NH_CONNECTED_CHK)) | |
1403 | connected = 1; | |
1404 | else | |
1405 | connected = 0; | |
1406 | ||
960035b2 | 1407 | if (!bgp_find_or_add_nexthop(peer->bgp, peer->bgp, |
d62a17ae | 1408 | family2afi(peer->su.sa.sa_family), NULL, |
1409 | peer, connected)) { | |
c42eab4b DS |
1410 | if (bgp_zebra_num_connects()) { |
1411 | if (bgp_debug_neighbor_events(peer)) | |
1412 | zlog_debug("%s [FSM] Waiting for NHT", | |
1413 | peer->host); | |
d62a17ae | 1414 | |
c42eab4b DS |
1415 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); |
1416 | return 0; | |
1417 | } | |
718e3744 | 1418 | } |
d62a17ae | 1419 | |
424ab01d QY |
1420 | assert(!peer->t_write); |
1421 | assert(!peer->t_read); | |
1422 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); | |
1423 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); | |
d62a17ae | 1424 | status = bgp_connect(peer); |
1425 | ||
1426 | switch (status) { | |
1427 | case connect_error: | |
1428 | if (bgp_debug_neighbor_events(peer)) | |
1429 | zlog_debug("%s [FSM] Connect error", peer->host); | |
1430 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1431 | break; | |
1432 | case connect_success: | |
1433 | if (bgp_debug_neighbor_events(peer)) | |
1434 | zlog_debug( | |
1435 | "%s [FSM] Connect immediately success, fd %d", | |
1436 | peer->host, peer->fd); | |
1437 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
1438 | break; | |
1439 | case connect_in_progress: | |
1440 | /* To check nonblocking connect, we wait until socket is | |
1441 | readable or writable. */ | |
1442 | if (bgp_debug_neighbor_events(peer)) | |
1443 | zlog_debug( | |
1444 | "%s [FSM] Non blocking connect waiting result, fd %d", | |
1445 | peer->host, peer->fd); | |
1446 | if (peer->fd < 0) { | |
af4c2728 | 1447 | flog_err(BGP_ERR_FSM, |
14454c9f DS |
1448 | "bgp_start peer's fd is negative value %d", |
1449 | peer->fd); | |
d62a17ae | 1450 | return -1; |
1451 | } | |
becedef6 | 1452 | /* |
387f984e QY |
1453 | * - when the socket becomes ready, poll() will signify POLLOUT |
1454 | * - if it fails to connect, poll() will signify POLLHUP | |
1455 | * - POLLHUP is handled as a 'read' event by thread.c | |
1456 | * | |
1457 | * therefore, we schedule both a read and a write event with | |
1458 | * bgp_connect_check() as the handler for each and cancel the | |
1459 | * unused event in that function. | |
becedef6 | 1460 | */ |
424ab01d | 1461 | thread_add_read(bm->master, bgp_connect_check, peer, peer->fd, |
387f984e QY |
1462 | &peer->t_connect_check_r); |
1463 | thread_add_write(bm->master, bgp_connect_check, peer, peer->fd, | |
1464 | &peer->t_connect_check_w); | |
d62a17ae | 1465 | break; |
1466 | } | |
1467 | return 0; | |
718e3744 | 1468 | } |
1469 | ||
1470 | /* Connect retry timer is expired when the peer status is Connect. */ | |
d62a17ae | 1471 | static int bgp_reconnect(struct peer *peer) |
718e3744 | 1472 | { |
d62a17ae | 1473 | if (bgp_stop(peer) < 0) |
1474 | return -1; | |
1ff9a340 | 1475 | |
d62a17ae | 1476 | bgp_start(peer); |
1477 | return 0; | |
718e3744 | 1478 | } |
1479 | ||
d62a17ae | 1480 | static int bgp_fsm_open(struct peer *peer) |
718e3744 | 1481 | { |
d62a17ae | 1482 | /* Send keepalive and make keepalive timer */ |
1483 | bgp_keepalive_send(peer); | |
718e3744 | 1484 | |
d62a17ae | 1485 | /* Reset holdtimer value. */ |
1486 | BGP_TIMER_OFF(peer->t_holdtime); | |
718e3744 | 1487 | |
d62a17ae | 1488 | return 0; |
718e3744 | 1489 | } |
1490 | ||
397b5bde LR |
1491 | /* FSM error, unexpected event. This is error of BGP connection. So cut the |
1492 | peer and change to Idle status. */ | |
d62a17ae | 1493 | static int bgp_fsm_event_error(struct peer *peer) |
397b5bde | 1494 | { |
af4c2728 | 1495 | flog_err(BGP_ERR_FSM, |
14454c9f DS |
1496 | "%s [FSM] unexpected packet received in state %s", peer->host, |
1497 | lookup_msg(bgp_status_msg, peer->status, NULL)); | |
397b5bde | 1498 | |
d62a17ae | 1499 | return bgp_stop_with_notify(peer, BGP_NOTIFY_FSM_ERR, 0); |
397b5bde LR |
1500 | } |
1501 | ||
718e3744 | 1502 | /* Hold timer expire. This is error of BGP connection. So cut the |
1503 | peer and change to Idle status. */ | |
d62a17ae | 1504 | static int bgp_fsm_holdtime_expire(struct peer *peer) |
718e3744 | 1505 | { |
d62a17ae | 1506 | if (bgp_debug_neighbor_events(peer)) |
1507 | zlog_debug("%s [FSM] Hold timer expire", peer->host); | |
718e3744 | 1508 | |
d62a17ae | 1509 | return bgp_stop_with_notify(peer, BGP_NOTIFY_HOLD_ERR, 0); |
718e3744 | 1510 | } |
1511 | ||
727c4f87 QY |
1512 | /** |
1513 | * Transition to Established state. | |
1514 | * | |
1515 | * Convert peer from stub to full fledged peer, set some timers, and generate | |
1516 | * initial updates. | |
1517 | */ | |
d62a17ae | 1518 | static int bgp_establish(struct peer *peer) |
718e3744 | 1519 | { |
d62a17ae | 1520 | afi_t afi; |
1521 | safi_t safi; | |
1522 | int nsf_af_count = 0; | |
1523 | int ret = 0; | |
1524 | struct peer *other; | |
1525 | ||
1526 | other = peer->doppelganger; | |
1527 | peer = peer_xfer_conn(peer); | |
1528 | if (!peer) { | |
af4c2728 | 1529 | flog_err(BGP_ERR_CONNECT, "%%Neighbor failed in xfer_conn"); |
d62a17ae | 1530 | return -1; |
93406d87 | 1531 | } |
93406d87 | 1532 | |
d62a17ae | 1533 | if (other == peer) |
996c9314 LB |
1534 | ret = 1; /* bgp_establish specific code when xfer_conn |
1535 | happens. */ | |
d62a17ae | 1536 | |
1537 | /* Reset capability open status flag. */ | |
1538 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN)) | |
1539 | SET_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN); | |
1540 | ||
1541 | /* Clear start timer value to default. */ | |
1542 | peer->v_start = BGP_INIT_START_TIMER; | |
1543 | ||
1544 | /* Increment established count. */ | |
1545 | peer->established++; | |
1546 | bgp_fsm_change_status(peer, Established); | |
1547 | ||
1548 | /* bgp log-neighbor-changes of neighbor Up */ | |
1549 | if (bgp_flag_check(peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { | |
1550 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); | |
1551 | zlog_info("%%ADJCHANGE: neighbor %s(%s) in vrf %s Up", | |
1552 | peer->host, | |
1553 | (peer->hostname) ? peer->hostname : "Unknown", | |
1554 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) ? vrf->name | |
1555 | : "Default") | |
1556 | : ""); | |
1557 | } | |
1558 | /* assign update-group/subgroup */ | |
1559 | update_group_adjust_peer_afs(peer); | |
1560 | ||
1561 | /* graceful restart */ | |
1562 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
1563 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 1564 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) { |
d62a17ae | 1565 | if (peer->afc_nego[afi][safi] |
1566 | && CHECK_FLAG(peer->cap, PEER_CAP_RESTART_ADV) | |
1567 | && CHECK_FLAG(peer->af_cap[afi][safi], | |
1568 | PEER_CAP_RESTART_AF_RCV)) { | |
1569 | if (peer->nsf[afi][safi] | |
1570 | && !CHECK_FLAG( | |
1571 | peer->af_cap[afi][safi], | |
1572 | PEER_CAP_RESTART_AF_PRESERVE_RCV)) | |
1573 | bgp_clear_stale_route(peer, afi, safi); | |
1574 | ||
1575 | peer->nsf[afi][safi] = 1; | |
1576 | nsf_af_count++; | |
1577 | } else { | |
1578 | if (peer->nsf[afi][safi]) | |
1579 | bgp_clear_stale_route(peer, afi, safi); | |
1580 | peer->nsf[afi][safi] = 0; | |
1581 | } | |
1582 | } | |
1583 | ||
1584 | if (nsf_af_count) | |
1585 | SET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1586 | else { | |
1587 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1588 | if (peer->t_gr_stale) { | |
1589 | BGP_TIMER_OFF(peer->t_gr_stale); | |
1590 | if (bgp_debug_neighbor_events(peer)) | |
1591 | zlog_debug( | |
1592 | "%s graceful restart stalepath timer stopped", | |
1593 | peer->host); | |
1594 | } | |
1595 | } | |
93406d87 | 1596 | |
d62a17ae | 1597 | if (peer->t_gr_restart) { |
1598 | BGP_TIMER_OFF(peer->t_gr_restart); | |
1599 | if (bgp_debug_neighbor_events(peer)) | |
1600 | zlog_debug("%s graceful restart timer stopped", | |
1601 | peer->host); | |
1602 | } | |
718e3744 | 1603 | |
d62a17ae | 1604 | hook_call(peer_established, peer); |
1605 | ||
9eb217ff QY |
1606 | /* Reset uptime, turn on keepalives, send current table. */ |
1607 | if (!peer->v_holdtime) | |
1608 | bgp_keepalives_on(peer); | |
1609 | ||
d62a17ae | 1610 | peer->uptime = bgp_clock(); |
1611 | ||
1612 | /* Send route-refresh when ORF is enabled */ | |
05c7a1cc QY |
1613 | FOREACH_AFI_SAFI (afi, safi) { |
1614 | if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1615 | PEER_CAP_ORF_PREFIX_SM_ADV)) { | |
d62a17ae | 1616 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc QY |
1617 | PEER_CAP_ORF_PREFIX_RM_RCV)) |
1618 | bgp_route_refresh_send(peer, afi, safi, | |
1619 | ORF_TYPE_PREFIX, | |
1620 | REFRESH_IMMEDIATE, 0); | |
1621 | else if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1622 | PEER_CAP_ORF_PREFIX_RM_OLD_RCV)) | |
1623 | bgp_route_refresh_send(peer, afi, safi, | |
1624 | ORF_TYPE_PREFIX_OLD, | |
1625 | REFRESH_IMMEDIATE, 0); | |
1626 | } | |
1627 | } | |
d62a17ae | 1628 | |
1629 | /* First update is deferred until ORF or ROUTE-REFRESH is received */ | |
05c7a1cc QY |
1630 | FOREACH_AFI_SAFI (afi, safi) { |
1631 | if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1632 | PEER_CAP_ORF_PREFIX_RM_ADV)) | |
d62a17ae | 1633 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc QY |
1634 | PEER_CAP_ORF_PREFIX_SM_RCV) |
1635 | || CHECK_FLAG(peer->af_cap[afi][safi], | |
1636 | PEER_CAP_ORF_PREFIX_SM_OLD_RCV)) | |
1637 | SET_FLAG(peer->af_sflags[afi][safi], | |
1638 | PEER_STATUS_ORF_WAIT_REFRESH); | |
1639 | } | |
d62a17ae | 1640 | |
1641 | bgp_announce_peer(peer); | |
1642 | ||
1643 | /* Start the route advertisement timer to send updates to the peer - if | |
1644 | * BGP | |
1645 | * is not in read-only mode. If it is, the timer will be started at the | |
1646 | * end | |
1647 | * of read-only mode. | |
1648 | */ | |
1649 | if (!bgp_update_delay_active(peer->bgp)) { | |
1650 | BGP_TIMER_OFF(peer->t_routeadv); | |
1651 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
1652 | } | |
718e3744 | 1653 | |
d62a17ae | 1654 | if (peer->doppelganger && (peer->doppelganger->status != Deleted)) { |
1655 | if (bgp_debug_neighbor_events(peer)) | |
1656 | zlog_debug( | |
1657 | "[Event] Deleting stub connection for peer %s", | |
1658 | peer->host); | |
1659 | ||
1660 | if (peer->doppelganger->status > Active) | |
1661 | bgp_notify_send(peer->doppelganger, BGP_NOTIFY_CEASE, | |
1662 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
1663 | else | |
1664 | peer_delete(peer->doppelganger); | |
718e3744 | 1665 | } |
1666 | ||
d62a17ae | 1667 | bgp_bfd_register_peer(peer); |
1668 | return ret; | |
718e3744 | 1669 | } |
1670 | ||
1671 | /* Keepalive packet is received. */ | |
d62a17ae | 1672 | static int bgp_fsm_keepalive(struct peer *peer) |
718e3744 | 1673 | { |
d62a17ae | 1674 | BGP_TIMER_OFF(peer->t_holdtime); |
1675 | return 0; | |
718e3744 | 1676 | } |
1677 | ||
1678 | /* Update packet is received. */ | |
d62a17ae | 1679 | static int bgp_fsm_update(struct peer *peer) |
718e3744 | 1680 | { |
d62a17ae | 1681 | BGP_TIMER_OFF(peer->t_holdtime); |
1682 | return 0; | |
718e3744 | 1683 | } |
1684 | ||
1685 | /* This is empty event. */ | |
d62a17ae | 1686 | static int bgp_ignore(struct peer *peer) |
718e3744 | 1687 | { |
af4c2728 | 1688 | flog_err( |
14454c9f | 1689 | BGP_ERR_FSM, |
d62a17ae | 1690 | "%s [FSM] Ignoring event %s in state %s, prior events %s, %s, fd %d", |
1691 | peer->host, bgp_event_str[peer->cur_event], | |
1692 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1693 | bgp_event_str[peer->last_event], | |
1694 | bgp_event_str[peer->last_major_event], peer->fd); | |
1695 | return 0; | |
718e3744 | 1696 | } |
6b0655a2 | 1697 | |
6403814c | 1698 | /* This is to handle unexpected events.. */ |
d62a17ae | 1699 | static int bgp_fsm_exeption(struct peer *peer) |
6403814c | 1700 | { |
af4c2728 | 1701 | flog_err( |
14454c9f | 1702 | BGP_ERR_FSM, |
d62a17ae | 1703 | "%s [FSM] Unexpected event %s in state %s, prior events %s, %s, fd %d", |
1704 | peer->host, bgp_event_str[peer->cur_event], | |
1705 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1706 | bgp_event_str[peer->last_event], | |
1707 | bgp_event_str[peer->last_major_event], peer->fd); | |
1708 | return (bgp_stop(peer)); | |
6403814c DS |
1709 | } |
1710 | ||
d62a17ae | 1711 | void bgp_fsm_nht_update(struct peer *peer, int valid) |
fc9a856f | 1712 | { |
d62a17ae | 1713 | if (!peer) |
1714 | return; | |
1715 | ||
1716 | switch (peer->status) { | |
1717 | case Idle: | |
1718 | if (valid) | |
1719 | BGP_EVENT_ADD(peer, BGP_Start); | |
1720 | break; | |
1721 | case Connect: | |
1722 | if (!valid) { | |
1723 | BGP_TIMER_OFF(peer->t_connect); | |
1724 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
1725 | } | |
1726 | break; | |
1727 | case Active: | |
1728 | if (valid) { | |
1729 | BGP_TIMER_OFF(peer->t_connect); | |
1730 | BGP_EVENT_ADD(peer, ConnectRetry_timer_expired); | |
1731 | } | |
1732 | break; | |
1733 | case OpenSent: | |
1734 | case OpenConfirm: | |
1735 | case Established: | |
1736 | if (!valid && (peer->gtsm_hops == 1)) | |
1737 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
1738 | case Clearing: | |
1739 | case Deleted: | |
1740 | default: | |
1741 | break; | |
fc9a856f | 1742 | } |
fc9a856f DS |
1743 | } |
1744 | ||
1745 | ||
718e3744 | 1746 | /* Finite State Machine structure */ |
fda1d3e0 | 1747 | static const struct { |
d62a17ae | 1748 | int (*func)(struct peer *); |
1749 | int next_state; | |
1750 | } FSM[BGP_STATUS_MAX - 1][BGP_EVENTS_MAX - 1] = { | |
1751 | { | |
1752 | /* Idle state: In Idle state, all events other than BGP_Start is | |
1753 | ignored. With BGP_Start event, finite state machine calls | |
1754 | bgp_start(). */ | |
1755 | {bgp_start, Connect}, /* BGP_Start */ | |
1756 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1757 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1758 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1759 | {bgp_ignore, Idle}, /* TCP_connection_open_failed */ | |
1760 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1761 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ | |
1762 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
1763 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
1764 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
1765 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
1766 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
1767 | {bgp_ignore, Idle}, /* Receive_NOTIFICATION_message */ | |
1768 | {bgp_ignore, Idle}, /* Clearing_Completed */ | |
1769 | }, | |
1770 | { | |
1771 | /* Connect */ | |
1772 | {bgp_ignore, Connect}, /* BGP_Start */ | |
1773 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1774 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1775 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1776 | {bgp_connect_fail, Active}, /* TCP_connection_open_failed */ | |
1777 | {bgp_connect_fail, Idle}, /* TCP_fatal_error */ | |
1778 | {bgp_reconnect, Connect}, /* ConnectRetry_timer_expired */ | |
1779 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ | |
1780 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1781 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1782 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
1783 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1784 | {bgp_stop, Idle}, /* Receive_NOTIFICATION_message */ | |
1785 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1786 | }, | |
1787 | { | |
1788 | /* Active, */ | |
1789 | {bgp_ignore, Active}, /* BGP_Start */ | |
1790 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1791 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1792 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1793 | {bgp_ignore, Active}, /* TCP_connection_open_failed */ | |
1794 | {bgp_fsm_exeption, Idle}, /* TCP_fatal_error */ | |
1795 | {bgp_start, Connect}, /* ConnectRetry_timer_expired */ | |
1796 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ | |
1797 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1798 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1799 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
1800 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1801 | {bgp_fsm_exeption, Idle}, /* Receive_NOTIFICATION_message */ | |
1802 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1803 | }, | |
1804 | { | |
1805 | /* OpenSent, */ | |
1806 | {bgp_ignore, OpenSent}, /* BGP_Start */ | |
1807 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1808 | {bgp_stop, Active}, /* TCP_connection_open */ | |
1809 | {bgp_stop, Active}, /* TCP_connection_closed */ | |
1810 | {bgp_stop, Active}, /* TCP_connection_open_failed */ | |
1811 | {bgp_stop, Active}, /* TCP_fatal_error */ | |
1812 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ | |
1813 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
1814 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1815 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ | |
1816 | {bgp_fsm_event_error, Idle}, /* Receive_KEEPALIVE_message */ | |
1817 | {bgp_fsm_event_error, Idle}, /* Receive_UPDATE_message */ | |
1818 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
1819 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1820 | }, | |
1821 | { | |
1822 | /* OpenConfirm, */ | |
1823 | {bgp_ignore, OpenConfirm}, /* BGP_Start */ | |
1824 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1825 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1826 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1827 | {bgp_stop, Idle}, /* TCP_connection_open_failed */ | |
1828 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1829 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ | |
1830 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
1831 | {bgp_ignore, OpenConfirm}, /* KeepAlive_timer_expired */ | |
1832 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1833 | {bgp_establish, Established}, /* Receive_KEEPALIVE_message */ | |
1834 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1835 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
1836 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1837 | }, | |
1838 | { | |
1839 | /* Established, */ | |
1840 | {bgp_ignore, Established}, /* BGP_Start */ | |
1841 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
1842 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1843 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
1844 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
1845 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
1846 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
1847 | {bgp_fsm_holdtime_expire, Clearing}, /* Hold_Timer_expired */ | |
03014d48 QY |
1848 | {bgp_ignore, Established}, /* KeepAlive_timer_expired */ |
1849 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
d62a17ae | 1850 | {bgp_fsm_keepalive, |
1851 | Established}, /* Receive_KEEPALIVE_message */ | |
1852 | {bgp_fsm_update, Established}, /* Receive_UPDATE_message */ | |
1853 | {bgp_stop_with_error, | |
1854 | Clearing}, /* Receive_NOTIFICATION_message */ | |
1855 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1856 | }, | |
1857 | { | |
1858 | /* Clearing, */ | |
1859 | {bgp_ignore, Clearing}, /* BGP_Start */ | |
1860 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
1861 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1862 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
1863 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
1864 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
1865 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
1866 | {bgp_stop, Clearing}, /* Hold_Timer_expired */ | |
1867 | {bgp_stop, Clearing}, /* KeepAlive_timer_expired */ | |
1868 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
1869 | {bgp_stop, Clearing}, /* Receive_KEEPALIVE_message */ | |
1870 | {bgp_stop, Clearing}, /* Receive_UPDATE_message */ | |
1871 | {bgp_stop, Clearing}, /* Receive_NOTIFICATION_message */ | |
1872 | {bgp_clearing_completed, Idle}, /* Clearing_Completed */ | |
1873 | }, | |
1874 | { | |
1875 | /* Deleted, */ | |
1876 | {bgp_ignore, Deleted}, /* BGP_Start */ | |
1877 | {bgp_ignore, Deleted}, /* BGP_Stop */ | |
1878 | {bgp_ignore, Deleted}, /* TCP_connection_open */ | |
1879 | {bgp_ignore, Deleted}, /* TCP_connection_closed */ | |
1880 | {bgp_ignore, Deleted}, /* TCP_connection_open_failed */ | |
1881 | {bgp_ignore, Deleted}, /* TCP_fatal_error */ | |
1882 | {bgp_ignore, Deleted}, /* ConnectRetry_timer_expired */ | |
1883 | {bgp_ignore, Deleted}, /* Hold_Timer_expired */ | |
1884 | {bgp_ignore, Deleted}, /* KeepAlive_timer_expired */ | |
1885 | {bgp_ignore, Deleted}, /* Receive_OPEN_message */ | |
1886 | {bgp_ignore, Deleted}, /* Receive_KEEPALIVE_message */ | |
1887 | {bgp_ignore, Deleted}, /* Receive_UPDATE_message */ | |
1888 | {bgp_ignore, Deleted}, /* Receive_NOTIFICATION_message */ | |
1889 | {bgp_ignore, Deleted}, /* Clearing_Completed */ | |
1890 | }, | |
718e3744 | 1891 | }; |
1892 | ||
718e3744 | 1893 | /* Execute event process. */ |
d62a17ae | 1894 | int bgp_event(struct thread *thread) |
718e3744 | 1895 | { |
d62a17ae | 1896 | int event; |
1897 | struct peer *peer; | |
1898 | int ret; | |
718e3744 | 1899 | |
d62a17ae | 1900 | peer = THREAD_ARG(thread); |
1901 | event = THREAD_VAL(thread); | |
718e3744 | 1902 | |
d62a17ae | 1903 | ret = bgp_event_update(peer, event); |
1ff9a340 | 1904 | |
d62a17ae | 1905 | return (ret); |
1ff9a340 DS |
1906 | } |
1907 | ||
d62a17ae | 1908 | int bgp_event_update(struct peer *peer, int event) |
1ff9a340 | 1909 | { |
d62a17ae | 1910 | int next; |
1911 | int ret = 0; | |
1912 | struct peer *other; | |
1913 | int passive_conn = 0; | |
1914 | int dyn_nbr; | |
1915 | ||
d8151687 QY |
1916 | /* default return code */ |
1917 | ret = FSM_PEER_NOOP; | |
1918 | ||
d62a17ae | 1919 | other = peer->doppelganger; |
1920 | passive_conn = | |
1921 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) ? 1 : 0; | |
1922 | dyn_nbr = peer_dynamic_neighbor(peer); | |
1923 | ||
1924 | /* Logging this event. */ | |
1925 | next = FSM[peer->status - 1][event - 1].next_state; | |
1926 | ||
1927 | if (bgp_debug_neighbor_events(peer) && peer->status != next) | |
1928 | zlog_debug("%s [FSM] %s (%s->%s), fd %d", peer->host, | |
1929 | bgp_event_str[event], | |
1930 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1931 | lookup_msg(bgp_status_msg, next, NULL), peer->fd); | |
1932 | ||
1933 | peer->last_event = peer->cur_event; | |
1934 | peer->cur_event = event; | |
1935 | ||
1936 | /* Call function. */ | |
1937 | if (FSM[peer->status - 1][event - 1].func) | |
1938 | ret = (*(FSM[peer->status - 1][event - 1].func))(peer); | |
1939 | ||
d62a17ae | 1940 | if (ret >= 0) { |
1941 | if (ret == 1 && next == Established) { | |
1942 | /* The case when doppelganger swap accurred in | |
1943 | bgp_establish. | |
1944 | Update the peer pointer accordingly */ | |
d8151687 | 1945 | ret = FSM_PEER_TRANSFERRED; |
d62a17ae | 1946 | peer = other; |
1947 | } | |
1948 | ||
1949 | /* If status is changed. */ | |
d8151687 | 1950 | if (next != peer->status) { |
d62a17ae | 1951 | bgp_fsm_change_status(peer, next); |
1952 | ||
becedef6 QY |
1953 | /* |
1954 | * If we're going to ESTABLISHED then we executed a | |
1955 | * peer transfer. In this case we can either return | |
1956 | * FSM_PEER_TRANSITIONED or FSM_PEER_TRANSFERRED. | |
1957 | * Opting for TRANSFERRED since transfer implies | |
1958 | * session establishment. | |
1959 | */ | |
d8151687 QY |
1960 | if (ret != FSM_PEER_TRANSFERRED) |
1961 | ret = FSM_PEER_TRANSITIONED; | |
1962 | } | |
1963 | ||
d62a17ae | 1964 | /* Make sure timer is set. */ |
1965 | bgp_timer_set(peer); | |
1966 | ||
bea01226 | 1967 | } else { |
becedef6 QY |
1968 | /* |
1969 | * If we got a return value of -1, that means there was an | |
1970 | * error, restart the FSM. Since bgp_stop() was called on the | |
1971 | * peer. only a few fields are safe to access here. In any case | |
1972 | * we need to indicate that the peer was stopped in the return | |
1973 | * code. | |
1974 | */ | |
bea01226 | 1975 | if (!dyn_nbr && !passive_conn && peer->bgp) { |
af4c2728 | 1976 | flog_err( |
14454c9f | 1977 | BGP_ERR_FSM, |
bea01226 QY |
1978 | "%s [FSM] Failure handling event %s in state %s, " |
1979 | "prior events %s, %s, fd %d", | |
1980 | peer->host, bgp_event_str[peer->cur_event], | |
1981 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1982 | bgp_event_str[peer->last_event], | |
1983 | bgp_event_str[peer->last_major_event], | |
1984 | peer->fd); | |
1985 | bgp_stop(peer); | |
1986 | bgp_fsm_change_status(peer, Idle); | |
1987 | bgp_timer_set(peer); | |
1988 | } | |
1989 | ret = FSM_PEER_STOPPED; | |
d62a17ae | 1990 | } |
bea01226 | 1991 | |
d62a17ae | 1992 | return ret; |
718e3744 | 1993 | } |