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d62a17ae | 1 | /* BGP-4 Finite State Machine |
896014f4 DL |
2 | * From RFC1771 [A Border Gateway Protocol 4 (BGP-4)] |
3 | * Copyright (C) 1996, 97, 98 Kunihiro Ishiguro | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along | |
18 | * with this program; see the file COPYING; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
718e3744 | 21 | |
22 | #include <zebra.h> | |
23 | ||
24 | #include "linklist.h" | |
25 | #include "prefix.h" | |
718e3744 | 26 | #include "sockunion.h" |
27 | #include "thread.h" | |
28 | #include "log.h" | |
29 | #include "stream.h" | |
30 | #include "memory.h" | |
31 | #include "plist.h" | |
f188f2c4 | 32 | #include "workqueue.h" |
3f9c7369 | 33 | #include "queue.h" |
039f3a34 | 34 | #include "filter.h" |
4dcadbef | 35 | #include "command.h" |
718e3744 | 36 | |
856ca177 | 37 | #include "lib/json.h" |
718e3744 | 38 | #include "bgpd/bgpd.h" |
39 | #include "bgpd/bgp_attr.h" | |
40 | #include "bgpd/bgp_debug.h" | |
41 | #include "bgpd/bgp_fsm.h" | |
42 | #include "bgpd/bgp_packet.h" | |
43 | #include "bgpd/bgp_network.h" | |
44 | #include "bgpd/bgp_route.h" | |
45 | #include "bgpd/bgp_dump.h" | |
46 | #include "bgpd/bgp_open.h" | |
f188f2c4 | 47 | #include "bgpd/bgp_advertise.h" |
3f9c7369 | 48 | #include "bgpd/bgp_updgrp.h" |
ffd0c037 | 49 | #include "bgpd/bgp_nht.h" |
c43ed2e4 | 50 | #include "bgpd/bgp_bfd.h" |
4a1ab8e4 | 51 | #include "bgpd/bgp_memory.h" |
03014d48 | 52 | #include "bgpd/bgp_keepalives.h" |
6b0655a2 | 53 | |
d62a17ae | 54 | DEFINE_HOOK(peer_backward_transition, (struct peer * peer), (peer)) |
55 | DEFINE_HOOK(peer_established, (struct peer * peer), (peer)) | |
3012671f | 56 | |
6403814c DS |
57 | /* Definition of display strings corresponding to FSM events. This should be |
58 | * kept consistent with the events defined in bgpd.h | |
59 | */ | |
d62a17ae | 60 | static const char *bgp_event_str[] = { |
61 | NULL, | |
62 | "BGP_Start", | |
63 | "BGP_Stop", | |
64 | "TCP_connection_open", | |
65 | "TCP_connection_closed", | |
66 | "TCP_connection_open_failed", | |
67 | "TCP_fatal_error", | |
68 | "ConnectRetry_timer_expired", | |
69 | "Hold_Timer_expired", | |
70 | "KeepAlive_timer_expired", | |
71 | "Receive_OPEN_message", | |
72 | "Receive_KEEPALIVE_message", | |
73 | "Receive_UPDATE_message", | |
74 | "Receive_NOTIFICATION_message", | |
75 | "Clearing_Completed", | |
6403814c DS |
76 | }; |
77 | ||
718e3744 | 78 | /* BGP FSM (finite state machine) has three types of functions. Type |
79 | one is thread functions. Type two is event functions. Type three | |
80 | is FSM functions. Timer functions are set by bgp_timer_set | |
81 | function. */ | |
82 | ||
83 | /* BGP event function. */ | |
d62a17ae | 84 | int bgp_event(struct thread *); |
718e3744 | 85 | |
86 | /* BGP thread functions. */ | |
d62a17ae | 87 | static int bgp_start_timer(struct thread *); |
88 | static int bgp_connect_timer(struct thread *); | |
89 | static int bgp_holdtime_timer(struct thread *); | |
718e3744 | 90 | |
91 | /* BGP FSM functions. */ | |
d62a17ae | 92 | static int bgp_start(struct peer *); |
718e3744 | 93 | |
d62a17ae | 94 | static void peer_xfer_stats(struct peer *peer_dst, struct peer *peer_src) |
1ff9a340 | 95 | { |
d62a17ae | 96 | /* Copy stats over. These are only the pre-established state stats */ |
97 | peer_dst->open_in += peer_src->open_in; | |
98 | peer_dst->open_out += peer_src->open_out; | |
99 | peer_dst->keepalive_in += peer_src->keepalive_in; | |
100 | peer_dst->keepalive_out += peer_src->keepalive_out; | |
101 | peer_dst->notify_in += peer_src->notify_in; | |
102 | peer_dst->notify_out += peer_src->notify_out; | |
103 | peer_dst->dynamic_cap_in += peer_src->dynamic_cap_in; | |
104 | peer_dst->dynamic_cap_out += peer_src->dynamic_cap_out; | |
1ff9a340 DS |
105 | } |
106 | ||
d62a17ae | 107 | static struct peer *peer_xfer_conn(struct peer *from_peer) |
1ff9a340 | 108 | { |
d62a17ae | 109 | struct peer *peer; |
110 | afi_t afi; | |
111 | safi_t safi; | |
112 | int fd; | |
113 | int status, pstatus; | |
114 | unsigned char last_evt, last_maj_evt; | |
115 | ||
116 | assert(from_peer != NULL); | |
117 | ||
118 | peer = from_peer->doppelganger; | |
119 | ||
120 | if (!peer || !CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE)) | |
121 | return from_peer; | |
122 | ||
123 | if (bgp_debug_neighbor_events(peer)) | |
124 | zlog_debug("%s: peer transfer %p fd %d -> %p fd %d)", | |
125 | from_peer->host, from_peer, from_peer->fd, peer, | |
126 | peer->fd); | |
127 | ||
d3ecc69e | 128 | peer_writes_off(peer); |
d62a17ae | 129 | BGP_READ_OFF(peer->t_read); |
d3ecc69e | 130 | peer_writes_off(from_peer); |
d62a17ae | 131 | BGP_READ_OFF(from_peer->t_read); |
132 | ||
133 | BGP_TIMER_OFF(peer->t_routeadv); | |
134 | BGP_TIMER_OFF(from_peer->t_routeadv); | |
135 | ||
136 | fd = peer->fd; | |
137 | peer->fd = from_peer->fd; | |
138 | from_peer->fd = fd; | |
139 | stream_reset(peer->ibuf); | |
d3ecc69e | 140 | |
727c4f87 QY |
141 | // At this point in time, it is possible that there are packets pending |
142 | // on | |
143 | // from_peer->obuf. These need to be transferred to the new peer struct. | |
d3ecc69e | 144 | pthread_mutex_lock(&peer->obuf_mtx); |
727c4f87 | 145 | pthread_mutex_lock(&from_peer->obuf_mtx); |
d3ecc69e | 146 | { |
727c4f87 | 147 | // wipe new peer's packet queue |
d3ecc69e | 148 | stream_fifo_clean(peer->obuf); |
d3ecc69e | 149 | |
727c4f87 QY |
150 | // copy each packet from old peer's queue to new peer's queue |
151 | while (from_peer->obuf->head) | |
152 | stream_fifo_push(peer->obuf, | |
153 | stream_fifo_pop(from_peer->obuf)); | |
d3ecc69e QY |
154 | } |
155 | pthread_mutex_unlock(&from_peer->obuf_mtx); | |
727c4f87 | 156 | pthread_mutex_unlock(&peer->obuf_mtx); |
d62a17ae | 157 | |
158 | peer->as = from_peer->as; | |
159 | peer->v_holdtime = from_peer->v_holdtime; | |
160 | peer->v_keepalive = from_peer->v_keepalive; | |
161 | peer->routeadv = from_peer->routeadv; | |
162 | peer->v_routeadv = from_peer->v_routeadv; | |
163 | peer->v_gr_restart = from_peer->v_gr_restart; | |
164 | peer->cap = from_peer->cap; | |
165 | status = peer->status; | |
166 | pstatus = peer->ostatus; | |
167 | last_evt = peer->last_event; | |
168 | last_maj_evt = peer->last_major_event; | |
169 | peer->status = from_peer->status; | |
170 | peer->ostatus = from_peer->ostatus; | |
171 | peer->last_event = from_peer->last_event; | |
172 | peer->last_major_event = from_peer->last_major_event; | |
173 | from_peer->status = status; | |
174 | from_peer->ostatus = pstatus; | |
175 | from_peer->last_event = last_evt; | |
176 | from_peer->last_major_event = last_maj_evt; | |
177 | peer->remote_id = from_peer->remote_id; | |
178 | ||
179 | if (from_peer->hostname != NULL) { | |
180 | if (peer->hostname) { | |
181 | XFREE(MTYPE_BGP_PEER_HOST, peer->hostname); | |
182 | peer->hostname = NULL; | |
183 | } | |
184 | ||
185 | peer->hostname = from_peer->hostname; | |
186 | from_peer->hostname = NULL; | |
187 | } | |
188 | ||
189 | if (from_peer->domainname != NULL) { | |
190 | if (peer->domainname) { | |
191 | XFREE(MTYPE_BGP_PEER_HOST, peer->domainname); | |
192 | peer->domainname = NULL; | |
193 | } | |
194 | ||
195 | peer->domainname = from_peer->domainname; | |
196 | from_peer->domainname = NULL; | |
197 | } | |
198 | ||
05c7a1cc QY |
199 | FOREACH_AFI_SAFI (afi, safi) { |
200 | peer->af_flags[afi][safi] = from_peer->af_flags[afi][safi]; | |
201 | peer->af_sflags[afi][safi] = from_peer->af_sflags[afi][safi]; | |
202 | peer->af_cap[afi][safi] = from_peer->af_cap[afi][safi]; | |
203 | peer->afc_nego[afi][safi] = from_peer->afc_nego[afi][safi]; | |
204 | peer->afc_adv[afi][safi] = from_peer->afc_adv[afi][safi]; | |
205 | peer->afc_recv[afi][safi] = from_peer->afc_recv[afi][safi]; | |
206 | peer->orf_plist[afi][safi] = from_peer->orf_plist[afi][safi]; | |
207 | } | |
d62a17ae | 208 | |
209 | if (bgp_getsockname(peer) < 0) { | |
210 | zlog_err( | |
211 | "%%bgp_getsockname() failed for %s peer %s fd %d (from_peer fd %d)", | |
212 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER) | |
213 | ? "accept" | |
214 | : ""), | |
215 | peer->host, peer->fd, from_peer->fd); | |
216 | bgp_stop(peer); | |
217 | bgp_stop(from_peer); | |
218 | return NULL; | |
219 | } | |
220 | if (from_peer->status > Active) { | |
221 | if (bgp_getsockname(from_peer) < 0) { | |
222 | zlog_err( | |
223 | "%%bgp_getsockname() failed for %s from_peer %s fd %d (peer fd %d)", | |
224 | (CHECK_FLAG(from_peer->sflags, | |
225 | PEER_STATUS_ACCEPT_PEER) | |
226 | ? "accept" | |
227 | : ""), | |
228 | from_peer->host, from_peer->fd, peer->fd); | |
229 | bgp_stop(from_peer); | |
230 | from_peer = NULL; | |
231 | } | |
232 | } | |
233 | ||
234 | BGP_READ_ON(peer->t_read, bgp_read, peer->fd); | |
d3ecc69e | 235 | peer_writes_on(peer); |
d62a17ae | 236 | |
237 | if (from_peer) | |
238 | peer_xfer_stats(peer, from_peer); | |
239 | ||
240 | return (peer); | |
1ff9a340 DS |
241 | } |
242 | ||
718e3744 | 243 | /* Hook function called after bgp event is occered. And vty's |
244 | neighbor command invoke this function after making neighbor | |
245 | structure. */ | |
d62a17ae | 246 | void bgp_timer_set(struct peer *peer) |
718e3744 | 247 | { |
d62a17ae | 248 | switch (peer->status) { |
249 | case Idle: | |
250 | /* First entry point of peer's finite state machine. In Idle | |
251 | status start timer is on unless peer is shutdown or peer is | |
252 | inactive. All other timer must be turned off */ | |
253 | if (BGP_PEER_START_SUPPRESSED(peer) || !peer_active(peer)) { | |
254 | BGP_TIMER_OFF(peer->t_start); | |
255 | } else { | |
256 | BGP_TIMER_ON(peer->t_start, bgp_start_timer, | |
257 | peer->v_start); | |
258 | } | |
259 | BGP_TIMER_OFF(peer->t_connect); | |
260 | BGP_TIMER_OFF(peer->t_holdtime); | |
03014d48 | 261 | peer_keepalives_off(peer); |
d62a17ae | 262 | BGP_TIMER_OFF(peer->t_routeadv); |
263 | break; | |
264 | ||
265 | case Connect: | |
266 | /* After start timer is expired, the peer moves to Connect | |
267 | status. Make sure start timer is off and connect timer is | |
268 | on. */ | |
269 | BGP_TIMER_OFF(peer->t_start); | |
270 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
271 | peer->v_connect); | |
272 | BGP_TIMER_OFF(peer->t_holdtime); | |
03014d48 | 273 | peer_keepalives_off(peer); |
d62a17ae | 274 | BGP_TIMER_OFF(peer->t_routeadv); |
275 | break; | |
276 | ||
277 | case Active: | |
278 | /* Active is waiting connection from remote peer. And if | |
279 | connect timer is expired, change status to Connect. */ | |
280 | BGP_TIMER_OFF(peer->t_start); | |
281 | /* If peer is passive mode, do not set connect timer. */ | |
282 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE) | |
283 | || CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
284 | BGP_TIMER_OFF(peer->t_connect); | |
285 | } else { | |
286 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
287 | peer->v_connect); | |
288 | } | |
289 | BGP_TIMER_OFF(peer->t_holdtime); | |
03014d48 | 290 | peer_keepalives_off(peer); |
d62a17ae | 291 | BGP_TIMER_OFF(peer->t_routeadv); |
292 | break; | |
293 | ||
294 | case OpenSent: | |
295 | /* OpenSent status. */ | |
296 | BGP_TIMER_OFF(peer->t_start); | |
297 | BGP_TIMER_OFF(peer->t_connect); | |
298 | if (peer->v_holdtime != 0) { | |
299 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
300 | peer->v_holdtime); | |
301 | } else { | |
302 | BGP_TIMER_OFF(peer->t_holdtime); | |
303 | } | |
03014d48 | 304 | peer_keepalives_off(peer); |
d62a17ae | 305 | BGP_TIMER_OFF(peer->t_routeadv); |
306 | break; | |
307 | ||
308 | case OpenConfirm: | |
309 | /* OpenConfirm status. */ | |
310 | BGP_TIMER_OFF(peer->t_start); | |
311 | BGP_TIMER_OFF(peer->t_connect); | |
312 | ||
313 | /* If the negotiated Hold Time value is zero, then the Hold Time | |
314 | timer and KeepAlive timers are not started. */ | |
315 | if (peer->v_holdtime == 0) { | |
316 | BGP_TIMER_OFF(peer->t_holdtime); | |
03014d48 | 317 | peer_keepalives_off(peer); |
d62a17ae | 318 | } else { |
319 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
320 | peer->v_holdtime); | |
03014d48 | 321 | peer_keepalives_on(peer); |
d62a17ae | 322 | } |
323 | BGP_TIMER_OFF(peer->t_routeadv); | |
324 | break; | |
325 | ||
326 | case Established: | |
327 | /* In Established status start and connect timer is turned | |
328 | off. */ | |
329 | BGP_TIMER_OFF(peer->t_start); | |
330 | BGP_TIMER_OFF(peer->t_connect); | |
331 | ||
332 | /* Same as OpenConfirm, if holdtime is zero then both holdtime | |
333 | and keepalive must be turned off. */ | |
334 | if (peer->v_holdtime == 0) { | |
335 | BGP_TIMER_OFF(peer->t_holdtime); | |
03014d48 | 336 | peer_keepalives_off(peer); |
d62a17ae | 337 | } else { |
338 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
339 | peer->v_holdtime); | |
03014d48 | 340 | peer_keepalives_on(peer); |
d62a17ae | 341 | } |
342 | break; | |
343 | case Deleted: | |
344 | BGP_TIMER_OFF(peer->t_gr_restart); | |
345 | BGP_TIMER_OFF(peer->t_gr_stale); | |
346 | BGP_TIMER_OFF(peer->t_pmax_restart); | |
347 | /* fallthru */ | |
348 | case Clearing: | |
349 | BGP_TIMER_OFF(peer->t_start); | |
350 | BGP_TIMER_OFF(peer->t_connect); | |
351 | BGP_TIMER_OFF(peer->t_holdtime); | |
03014d48 | 352 | peer_keepalives_off(peer); |
d62a17ae | 353 | BGP_TIMER_OFF(peer->t_routeadv); |
354 | break; | |
718e3744 | 355 | } |
718e3744 | 356 | } |
357 | ||
358 | /* BGP start timer. This function set BGP_Start event to thread value | |
359 | and process event. */ | |
d62a17ae | 360 | static int bgp_start_timer(struct thread *thread) |
718e3744 | 361 | { |
d62a17ae | 362 | struct peer *peer; |
718e3744 | 363 | |
d62a17ae | 364 | peer = THREAD_ARG(thread); |
365 | peer->t_start = NULL; | |
718e3744 | 366 | |
d62a17ae | 367 | if (bgp_debug_neighbor_events(peer)) |
368 | zlog_debug("%s [FSM] Timer (start timer expire).", peer->host); | |
718e3744 | 369 | |
d62a17ae | 370 | THREAD_VAL(thread) = BGP_Start; |
371 | bgp_event(thread); /* bgp_event unlocks peer */ | |
718e3744 | 372 | |
d62a17ae | 373 | return 0; |
718e3744 | 374 | } |
375 | ||
376 | /* BGP connect retry timer. */ | |
d62a17ae | 377 | static int bgp_connect_timer(struct thread *thread) |
718e3744 | 378 | { |
d62a17ae | 379 | struct peer *peer; |
380 | int ret; | |
381 | ||
382 | peer = THREAD_ARG(thread); | |
383 | peer->t_connect = NULL; | |
384 | ||
385 | if (bgp_debug_neighbor_events(peer)) | |
386 | zlog_debug("%s [FSM] Timer (connect timer expire)", peer->host); | |
387 | ||
388 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) { | |
389 | bgp_stop(peer); | |
390 | ret = -1; | |
391 | } else { | |
392 | THREAD_VAL(thread) = ConnectRetry_timer_expired; | |
393 | bgp_event(thread); /* bgp_event unlocks peer */ | |
394 | ret = 0; | |
395 | } | |
396 | ||
397 | return ret; | |
718e3744 | 398 | } |
399 | ||
400 | /* BGP holdtime timer. */ | |
d62a17ae | 401 | static int bgp_holdtime_timer(struct thread *thread) |
718e3744 | 402 | { |
d62a17ae | 403 | struct peer *peer; |
718e3744 | 404 | |
d62a17ae | 405 | peer = THREAD_ARG(thread); |
406 | peer->t_holdtime = NULL; | |
718e3744 | 407 | |
d62a17ae | 408 | if (bgp_debug_neighbor_events(peer)) |
409 | zlog_debug("%s [FSM] Timer (holdtime timer expire)", | |
410 | peer->host); | |
718e3744 | 411 | |
d62a17ae | 412 | THREAD_VAL(thread) = Hold_Timer_expired; |
413 | bgp_event(thread); /* bgp_event unlocks peer */ | |
718e3744 | 414 | |
d62a17ae | 415 | return 0; |
718e3744 | 416 | } |
417 | ||
d62a17ae | 418 | int bgp_routeadv_timer(struct thread *thread) |
718e3744 | 419 | { |
d62a17ae | 420 | struct peer *peer; |
718e3744 | 421 | |
d62a17ae | 422 | peer = THREAD_ARG(thread); |
423 | peer->t_routeadv = NULL; | |
718e3744 | 424 | |
d62a17ae | 425 | if (bgp_debug_neighbor_events(peer)) |
426 | zlog_debug("%s [FSM] Timer (routeadv timer expire)", | |
427 | peer->host); | |
718e3744 | 428 | |
d62a17ae | 429 | peer->synctime = bgp_clock(); |
718e3744 | 430 | |
d62a17ae | 431 | /* MRAI timer will be started again when FIFO is built, no need to |
432 | * do it here. | |
433 | */ | |
434 | return 0; | |
718e3744 | 435 | } |
436 | ||
e0701b79 | 437 | /* BGP Peer Down Cause */ |
d62a17ae | 438 | const char *peer_down_str[] = {"", |
439 | "Router ID changed", | |
440 | "Remote AS changed", | |
441 | "Local AS change", | |
442 | "Cluster ID changed", | |
443 | "Confederation identifier changed", | |
444 | "Confederation peer changed", | |
445 | "RR client config change", | |
446 | "RS client config change", | |
447 | "Update source change", | |
448 | "Address family activated", | |
449 | "Admin. shutdown", | |
450 | "User reset", | |
451 | "BGP Notification received", | |
452 | "BGP Notification send", | |
453 | "Peer closed the session", | |
454 | "Neighbor deleted", | |
455 | "Peer-group add member", | |
456 | "Peer-group delete member", | |
457 | "Capability changed", | |
458 | "Passive config change", | |
459 | "Multihop config change", | |
460 | "NSF peer closed the session", | |
461 | "Intf peering v6only config change", | |
462 | "BFD down received", | |
463 | "Interface down", | |
464 | "Neighbor address lost"}; | |
465 | ||
466 | static int bgp_graceful_restart_timer_expire(struct thread *thread) | |
e0701b79 | 467 | { |
d62a17ae | 468 | struct peer *peer; |
469 | afi_t afi; | |
470 | safi_t safi; | |
471 | ||
472 | peer = THREAD_ARG(thread); | |
473 | peer->t_gr_restart = NULL; | |
474 | ||
475 | /* NSF delete stale route */ | |
476 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 477 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) |
d62a17ae | 478 | if (peer->nsf[afi][safi]) |
479 | bgp_clear_stale_route(peer, afi, safi); | |
480 | ||
481 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
482 | BGP_TIMER_OFF(peer->t_gr_stale); | |
483 | ||
484 | if (bgp_debug_neighbor_events(peer)) { | |
485 | zlog_debug("%s graceful restart timer expired", peer->host); | |
486 | zlog_debug("%s graceful restart stalepath timer stopped", | |
487 | peer->host); | |
488 | } | |
93406d87 | 489 | |
d62a17ae | 490 | bgp_timer_set(peer); |
93406d87 | 491 | |
d62a17ae | 492 | return 0; |
93406d87 | 493 | } |
494 | ||
d62a17ae | 495 | static int bgp_graceful_stale_timer_expire(struct thread *thread) |
93406d87 | 496 | { |
d62a17ae | 497 | struct peer *peer; |
498 | afi_t afi; | |
499 | safi_t safi; | |
93406d87 | 500 | |
d62a17ae | 501 | peer = THREAD_ARG(thread); |
502 | peer->t_gr_stale = NULL; | |
93406d87 | 503 | |
d62a17ae | 504 | if (bgp_debug_neighbor_events(peer)) |
505 | zlog_debug("%s graceful restart stalepath timer expired", | |
506 | peer->host); | |
93406d87 | 507 | |
d62a17ae | 508 | /* NSF delete stale route */ |
509 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 510 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) |
d62a17ae | 511 | if (peer->nsf[afi][safi]) |
512 | bgp_clear_stale_route(peer, afi, safi); | |
93406d87 | 513 | |
d62a17ae | 514 | return 0; |
93406d87 | 515 | } |
516 | ||
d62a17ae | 517 | static int bgp_update_delay_applicable(struct bgp *bgp) |
f188f2c4 | 518 | { |
d62a17ae | 519 | /* update_delay_over flag should be reset (set to 0) for any new |
520 | applicability of the update-delay during BGP process lifetime. | |
521 | And it should be set after an occurence of the update-delay is | |
522 | over)*/ | |
523 | if (!bgp->update_delay_over) | |
524 | return 1; | |
525 | ||
526 | return 0; | |
f188f2c4 DS |
527 | } |
528 | ||
d62a17ae | 529 | int bgp_update_delay_active(struct bgp *bgp) |
f188f2c4 | 530 | { |
d62a17ae | 531 | if (bgp->t_update_delay) |
532 | return 1; | |
f188f2c4 | 533 | |
d62a17ae | 534 | return 0; |
f188f2c4 DS |
535 | } |
536 | ||
d62a17ae | 537 | int bgp_update_delay_configured(struct bgp *bgp) |
f188f2c4 | 538 | { |
d62a17ae | 539 | if (bgp->v_update_delay) |
540 | return 1; | |
f188f2c4 | 541 | |
d62a17ae | 542 | return 0; |
f188f2c4 DS |
543 | } |
544 | ||
545 | /* Do the post-processing needed when bgp comes out of the read-only mode | |
546 | on ending the update delay. */ | |
d62a17ae | 547 | void bgp_update_delay_end(struct bgp *bgp) |
f188f2c4 | 548 | { |
d62a17ae | 549 | THREAD_TIMER_OFF(bgp->t_update_delay); |
550 | THREAD_TIMER_OFF(bgp->t_establish_wait); | |
551 | ||
552 | /* Reset update-delay related state */ | |
553 | bgp->update_delay_over = 1; | |
554 | bgp->established = 0; | |
555 | bgp->restarted_peers = 0; | |
556 | bgp->implicit_eors = 0; | |
557 | bgp->explicit_eors = 0; | |
558 | ||
559 | quagga_timestamp(3, bgp->update_delay_end_time, | |
560 | sizeof(bgp->update_delay_end_time)); | |
561 | ||
562 | /* | |
563 | * Add an end-of-initial-update marker to the main process queues so | |
564 | * that | |
565 | * the route advertisement timer for the peers can be started. Also set | |
566 | * the zebra and peer update hold flags. These flags are used to achieve | |
567 | * three stages in the update-delay post processing: | |
568 | * 1. Finish best-path selection for all the prefixes held on the | |
569 | * queues. | |
570 | * (routes in BGP are updated, and peers sync queues are populated | |
571 | * too) | |
572 | * 2. As the eoiu mark is reached in the bgp process routine, ship all | |
573 | * the | |
574 | * routes to zebra. With that zebra should see updates from BGP | |
575 | * close | |
576 | * to each other. | |
577 | * 3. Unblock the peer update writes. With that peer update packing | |
578 | * with | |
579 | * the prefixes should be at its maximum. | |
580 | */ | |
581 | bgp_add_eoiu_mark(bgp); | |
582 | bgp->main_zebra_update_hold = 1; | |
583 | bgp->main_peers_update_hold = 1; | |
584 | ||
585 | /* Resume the queue processing. This should trigger the event that would | |
586 | take | |
587 | care of processing any work that was queued during the read-only | |
588 | mode. */ | |
589 | work_queue_unplug(bm->process_main_queue); | |
f188f2c4 DS |
590 | } |
591 | ||
cb1faec9 DS |
592 | /** |
593 | * see bgp_fsm.h | |
594 | */ | |
d62a17ae | 595 | void bgp_start_routeadv(struct bgp *bgp) |
cb1faec9 | 596 | { |
d62a17ae | 597 | struct listnode *node, *nnode; |
598 | struct peer *peer; | |
cb1faec9 | 599 | |
d62a17ae | 600 | zlog_info("bgp_start_routeadv(), update hold status %d", |
601 | bgp->main_peers_update_hold); | |
4a16ae86 | 602 | |
d62a17ae | 603 | if (bgp->main_peers_update_hold) |
604 | return; | |
4a16ae86 | 605 | |
d62a17ae | 606 | quagga_timestamp(3, bgp->update_delay_peers_resume_time, |
607 | sizeof(bgp->update_delay_peers_resume_time)); | |
4a16ae86 | 608 | |
d62a17ae | 609 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) { |
610 | if (peer->status != Established) | |
611 | continue; | |
612 | BGP_TIMER_OFF(peer->t_routeadv); | |
613 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
614 | } | |
cb1faec9 DS |
615 | } |
616 | ||
617 | /** | |
618 | * see bgp_fsm.h | |
619 | */ | |
d62a17ae | 620 | void bgp_adjust_routeadv(struct peer *peer) |
cb1faec9 | 621 | { |
d62a17ae | 622 | time_t nowtime = bgp_clock(); |
623 | double diff; | |
624 | unsigned long remain; | |
625 | ||
626 | /* Bypass checks for special case of MRAI being 0 */ | |
627 | if (peer->v_routeadv == 0) { | |
628 | /* Stop existing timer, just in case it is running for a | |
629 | * different | |
630 | * duration and schedule write thread immediately. | |
631 | */ | |
632 | if (peer->t_routeadv) | |
633 | BGP_TIMER_OFF(peer->t_routeadv); | |
634 | ||
635 | peer->synctime = bgp_clock(); | |
d62a17ae | 636 | return; |
637 | } | |
638 | ||
639 | ||
640 | /* | |
641 | * CASE I: | |
642 | * If the last update was written more than MRAI back, expire the timer | |
643 | * instantly so that we can send the update out sooner. | |
644 | * | |
645 | * <------- MRAI ---------> | |
646 | * |-----------------|-----------------------| | |
647 | * <------------- m ------------> | |
648 | * ^ ^ ^ | |
649 | * | | | | |
650 | * | | current time | |
651 | * | timer start | |
652 | * last write | |
653 | * | |
654 | * m > MRAI | |
655 | */ | |
656 | diff = difftime(nowtime, peer->last_update); | |
657 | if (diff > (double)peer->v_routeadv) { | |
658 | BGP_TIMER_OFF(peer->t_routeadv); | |
659 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
660 | return; | |
661 | } | |
662 | ||
663 | /* | |
664 | * CASE II: | |
665 | * - Find when to expire the MRAI timer. | |
666 | * If MRAI timer is not active, assume we can start it now. | |
667 | * | |
668 | * <------- MRAI ---------> | |
669 | * |------------|-----------------------| | |
670 | * <-------- m ----------><----- r -----> | |
671 | * ^ ^ ^ | |
672 | * | | | | |
673 | * | | current time | |
674 | * | timer start | |
675 | * last write | |
676 | * | |
677 | * (MRAI - m) < r | |
678 | */ | |
679 | if (peer->t_routeadv) | |
680 | remain = thread_timer_remain_second(peer->t_routeadv); | |
681 | else | |
682 | remain = peer->v_routeadv; | |
683 | diff = peer->v_routeadv - diff; | |
684 | if (diff <= (double)remain) { | |
685 | BGP_TIMER_OFF(peer->t_routeadv); | |
686 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, diff); | |
687 | } | |
cb1faec9 DS |
688 | } |
689 | ||
d62a17ae | 690 | static int bgp_maxmed_onstartup_applicable(struct bgp *bgp) |
abc920f8 | 691 | { |
d62a17ae | 692 | if (!bgp->maxmed_onstartup_over) |
693 | return 1; | |
abc920f8 | 694 | |
d62a17ae | 695 | return 0; |
abc920f8 DS |
696 | } |
697 | ||
d62a17ae | 698 | int bgp_maxmed_onstartup_configured(struct bgp *bgp) |
abc920f8 | 699 | { |
d62a17ae | 700 | if (bgp->v_maxmed_onstartup != BGP_MAXMED_ONSTARTUP_UNCONFIGURED) |
701 | return 1; | |
abc920f8 | 702 | |
d62a17ae | 703 | return 0; |
abc920f8 DS |
704 | } |
705 | ||
d62a17ae | 706 | int bgp_maxmed_onstartup_active(struct bgp *bgp) |
abc920f8 | 707 | { |
d62a17ae | 708 | if (bgp->t_maxmed_onstartup) |
709 | return 1; | |
abc920f8 | 710 | |
d62a17ae | 711 | return 0; |
abc920f8 DS |
712 | } |
713 | ||
d62a17ae | 714 | void bgp_maxmed_update(struct bgp *bgp) |
abc920f8 | 715 | { |
d62a17ae | 716 | u_char maxmed_active; |
717 | u_int32_t maxmed_value; | |
718 | ||
719 | if (bgp->v_maxmed_admin) { | |
720 | maxmed_active = 1; | |
721 | maxmed_value = bgp->maxmed_admin_value; | |
722 | } else if (bgp->t_maxmed_onstartup) { | |
723 | maxmed_active = 1; | |
724 | maxmed_value = bgp->maxmed_onstartup_value; | |
725 | } else { | |
726 | maxmed_active = 0; | |
727 | maxmed_value = BGP_MAXMED_VALUE_DEFAULT; | |
728 | } | |
729 | ||
730 | if (bgp->maxmed_active != maxmed_active | |
731 | || bgp->maxmed_value != maxmed_value) { | |
732 | bgp->maxmed_active = maxmed_active; | |
733 | bgp->maxmed_value = maxmed_value; | |
734 | ||
735 | update_group_announce(bgp); | |
736 | } | |
abc920f8 DS |
737 | } |
738 | ||
739 | /* The maxmed onstartup timer expiry callback. */ | |
d62a17ae | 740 | static int bgp_maxmed_onstartup_timer(struct thread *thread) |
abc920f8 | 741 | { |
d62a17ae | 742 | struct bgp *bgp; |
abc920f8 | 743 | |
d62a17ae | 744 | zlog_info("Max med on startup ended - timer expired."); |
abc920f8 | 745 | |
d62a17ae | 746 | bgp = THREAD_ARG(thread); |
747 | THREAD_TIMER_OFF(bgp->t_maxmed_onstartup); | |
748 | bgp->maxmed_onstartup_over = 1; | |
abc920f8 | 749 | |
d62a17ae | 750 | bgp_maxmed_update(bgp); |
abc920f8 | 751 | |
d62a17ae | 752 | return 0; |
abc920f8 DS |
753 | } |
754 | ||
d62a17ae | 755 | static void bgp_maxmed_onstartup_begin(struct bgp *bgp) |
abc920f8 | 756 | { |
d62a17ae | 757 | /* Applicable only once in the process lifetime on the startup */ |
758 | if (bgp->maxmed_onstartup_over) | |
759 | return; | |
abc920f8 | 760 | |
d62a17ae | 761 | zlog_info("Begin maxmed onstartup mode - timer %d seconds", |
762 | bgp->v_maxmed_onstartup); | |
abc920f8 | 763 | |
d62a17ae | 764 | thread_add_timer(bm->master, bgp_maxmed_onstartup_timer, bgp, |
765 | bgp->v_maxmed_onstartup, &bgp->t_maxmed_onstartup); | |
abc920f8 | 766 | |
d62a17ae | 767 | if (!bgp->v_maxmed_admin) { |
768 | bgp->maxmed_active = 1; | |
769 | bgp->maxmed_value = bgp->maxmed_onstartup_value; | |
770 | } | |
abc920f8 | 771 | |
d62a17ae | 772 | /* Route announce to all peers should happen after this in |
773 | * bgp_establish() */ | |
abc920f8 DS |
774 | } |
775 | ||
d62a17ae | 776 | static void bgp_maxmed_onstartup_process_status_change(struct peer *peer) |
abc920f8 | 777 | { |
d62a17ae | 778 | if (peer->status == Established && !peer->bgp->established) { |
779 | bgp_maxmed_onstartup_begin(peer->bgp); | |
780 | } | |
abc920f8 DS |
781 | } |
782 | ||
f188f2c4 | 783 | /* The update delay timer expiry callback. */ |
d62a17ae | 784 | static int bgp_update_delay_timer(struct thread *thread) |
f188f2c4 | 785 | { |
d62a17ae | 786 | struct bgp *bgp; |
f188f2c4 | 787 | |
d62a17ae | 788 | zlog_info("Update delay ended - timer expired."); |
f188f2c4 | 789 | |
d62a17ae | 790 | bgp = THREAD_ARG(thread); |
791 | THREAD_TIMER_OFF(bgp->t_update_delay); | |
792 | bgp_update_delay_end(bgp); | |
f188f2c4 | 793 | |
d62a17ae | 794 | return 0; |
f188f2c4 DS |
795 | } |
796 | ||
797 | /* The establish wait timer expiry callback. */ | |
d62a17ae | 798 | static int bgp_establish_wait_timer(struct thread *thread) |
f188f2c4 | 799 | { |
d62a17ae | 800 | struct bgp *bgp; |
f188f2c4 | 801 | |
d62a17ae | 802 | zlog_info("Establish wait - timer expired."); |
f188f2c4 | 803 | |
d62a17ae | 804 | bgp = THREAD_ARG(thread); |
805 | THREAD_TIMER_OFF(bgp->t_establish_wait); | |
806 | bgp_check_update_delay(bgp); | |
f188f2c4 | 807 | |
d62a17ae | 808 | return 0; |
f188f2c4 DS |
809 | } |
810 | ||
811 | /* Steps to begin the update delay: | |
812 | - initialize queues if needed | |
813 | - stop the queue processing | |
814 | - start the timer */ | |
d62a17ae | 815 | static void bgp_update_delay_begin(struct bgp *bgp) |
f188f2c4 | 816 | { |
d62a17ae | 817 | struct listnode *node, *nnode; |
818 | struct peer *peer; | |
f188f2c4 | 819 | |
d62a17ae | 820 | /* Stop the processing of queued work. Enqueue shall continue */ |
821 | work_queue_plug(bm->process_main_queue); | |
f188f2c4 | 822 | |
d62a17ae | 823 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) |
824 | peer->update_delay_over = 0; | |
f188f2c4 | 825 | |
d62a17ae | 826 | /* Start the update-delay timer */ |
827 | thread_add_timer(bm->master, bgp_update_delay_timer, bgp, | |
828 | bgp->v_update_delay, &bgp->t_update_delay); | |
f188f2c4 | 829 | |
d62a17ae | 830 | if (bgp->v_establish_wait != bgp->v_update_delay) |
831 | thread_add_timer(bm->master, bgp_establish_wait_timer, bgp, | |
832 | bgp->v_establish_wait, &bgp->t_establish_wait); | |
f188f2c4 | 833 | |
d62a17ae | 834 | quagga_timestamp(3, bgp->update_delay_begin_time, |
835 | sizeof(bgp->update_delay_begin_time)); | |
f188f2c4 DS |
836 | } |
837 | ||
d62a17ae | 838 | static void bgp_update_delay_process_status_change(struct peer *peer) |
f188f2c4 | 839 | { |
d62a17ae | 840 | if (peer->status == Established) { |
841 | if (!peer->bgp->established++) { | |
842 | bgp_update_delay_begin(peer->bgp); | |
843 | zlog_info( | |
844 | "Begin read-only mode - update-delay timer %d seconds", | |
845 | peer->bgp->v_update_delay); | |
846 | } | |
847 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_BIT_RCV)) | |
848 | bgp_update_restarted_peers(peer); | |
849 | } | |
850 | if (peer->ostatus == Established | |
851 | && bgp_update_delay_active(peer->bgp)) { | |
852 | /* Adjust the update-delay state to account for this flap. | |
853 | NOTE: Intentionally skipping adjusting implicit_eors or | |
854 | explicit_eors | |
855 | counters. Extra sanity check in bgp_check_update_delay() | |
856 | should | |
857 | be enough to take care of any additive discrepancy in bgp eor | |
858 | counters */ | |
859 | peer->bgp->established--; | |
860 | peer->update_delay_over = 0; | |
861 | } | |
f188f2c4 DS |
862 | } |
863 | ||
200df115 | 864 | /* Called after event occured, this function change status and reset |
865 | read/write and timer thread. */ | |
d62a17ae | 866 | void bgp_fsm_change_status(struct peer *peer, int status) |
200df115 | 867 | { |
1ff9a340 | 868 | |
d62a17ae | 869 | bgp_dump_state(peer, peer->status, status); |
870 | ||
871 | /* Transition into Clearing or Deleted must /always/ clear all routes.. | |
872 | * (and must do so before actually changing into Deleted.. | |
873 | */ | |
874 | if (status >= Clearing) { | |
875 | bgp_clear_route_all(peer); | |
876 | ||
877 | /* If no route was queued for the clear-node processing, | |
878 | * generate the | |
879 | * completion event here. This is needed because if there are no | |
880 | * routes | |
881 | * to trigger the background clear-node thread, the event won't | |
882 | * get | |
883 | * generated and the peer would be stuck in Clearing. Note that | |
884 | * this | |
885 | * event is for the peer and helps the peer transition out of | |
886 | * Clearing | |
887 | * state; it should not be generated per (AFI,SAFI). The event | |
888 | * is | |
889 | * directly posted here without calling clear_node_complete() as | |
890 | * we | |
891 | * shouldn't do an extra unlock. This event will get processed | |
892 | * after | |
893 | * the state change that happens below, so peer will be in | |
894 | * Clearing | |
895 | * (or Deleted). | |
896 | */ | |
897 | if (!work_queue_is_scheduled(peer->clear_node_queue)) | |
898 | BGP_EVENT_ADD(peer, Clearing_Completed); | |
899 | } | |
900 | ||
901 | /* Preserve old status and change into new status. */ | |
902 | peer->ostatus = peer->status; | |
903 | peer->status = status; | |
904 | ||
905 | /* Save event that caused status change. */ | |
906 | peer->last_major_event = peer->cur_event; | |
907 | ||
908 | if (status == Established) | |
909 | UNSET_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER); | |
910 | ||
911 | /* If max-med processing is applicable, do the necessary. */ | |
912 | if (status == Established) { | |
913 | if (bgp_maxmed_onstartup_configured(peer->bgp) | |
914 | && bgp_maxmed_onstartup_applicable(peer->bgp)) | |
915 | bgp_maxmed_onstartup_process_status_change(peer); | |
916 | else | |
917 | peer->bgp->maxmed_onstartup_over = 1; | |
918 | } | |
919 | ||
920 | /* If update-delay processing is applicable, do the necessary. */ | |
921 | if (bgp_update_delay_configured(peer->bgp) | |
922 | && bgp_update_delay_applicable(peer->bgp)) | |
923 | bgp_update_delay_process_status_change(peer); | |
924 | ||
925 | if (bgp_debug_neighbor_events(peer)) | |
926 | zlog_debug("%s went from %s to %s", peer->host, | |
927 | lookup_msg(bgp_status_msg, peer->ostatus, NULL), | |
928 | lookup_msg(bgp_status_msg, peer->status, NULL)); | |
200df115 | 929 | } |
930 | ||
3117b5c4 | 931 | /* Flush the event queue and ensure the peer is shut down */ |
d62a17ae | 932 | static int bgp_clearing_completed(struct peer *peer) |
3117b5c4 | 933 | { |
d62a17ae | 934 | int rc = bgp_stop(peer); |
1ff9a340 | 935 | |
d62a17ae | 936 | if (rc >= 0) |
937 | BGP_EVENT_FLUSH(peer); | |
3117b5c4 | 938 | |
d62a17ae | 939 | return rc; |
3117b5c4 SH |
940 | } |
941 | ||
718e3744 | 942 | /* Administrative BGP peer stop event. */ |
3117b5c4 | 943 | /* May be called multiple times for the same peer */ |
d62a17ae | 944 | int bgp_stop(struct peer *peer) |
718e3744 | 945 | { |
d62a17ae | 946 | afi_t afi; |
947 | safi_t safi; | |
948 | char orf_name[BUFSIZ]; | |
949 | int ret = 0; | |
950 | ||
951 | if (peer_dynamic_neighbor(peer) | |
952 | && !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
953 | if (bgp_debug_neighbor_events(peer)) | |
954 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
955 | peer_delete(peer); | |
956 | return -1; | |
c22767d8 | 957 | } |
848973c7 | 958 | |
d62a17ae | 959 | /* Can't do this in Clearing; events are used for state transitions */ |
960 | if (peer->status != Clearing) { | |
961 | /* Delete all existing events of the peer */ | |
962 | BGP_EVENT_FLUSH(peer); | |
93406d87 | 963 | } |
d62a17ae | 964 | |
965 | /* Increment Dropped count. */ | |
966 | if (peer->status == Established) { | |
967 | peer->dropped++; | |
968 | ||
969 | /* bgp log-neighbor-changes of neighbor Down */ | |
970 | if (bgp_flag_check(peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { | |
971 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); | |
972 | zlog_info( | |
973 | "%%ADJCHANGE: neighbor %s(%s) in vrf %s Down %s", | |
974 | peer->host, | |
975 | (peer->hostname) ? peer->hostname : "Unknown", | |
976 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) ? vrf->name | |
977 | : "Default") | |
978 | : "", | |
979 | peer_down_str[(int)peer->last_reset]); | |
980 | } | |
981 | ||
982 | /* graceful restart */ | |
983 | if (peer->t_gr_stale) { | |
984 | BGP_TIMER_OFF(peer->t_gr_stale); | |
985 | if (bgp_debug_neighbor_events(peer)) | |
986 | zlog_debug( | |
987 | "%s graceful restart stalepath timer stopped", | |
988 | peer->host); | |
989 | } | |
990 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
991 | if (bgp_debug_neighbor_events(peer)) { | |
992 | zlog_debug( | |
993 | "%s graceful restart timer started for %d sec", | |
994 | peer->host, peer->v_gr_restart); | |
995 | zlog_debug( | |
996 | "%s graceful restart stalepath timer started for %d sec", | |
997 | peer->host, peer->bgp->stalepath_time); | |
998 | } | |
999 | BGP_TIMER_ON(peer->t_gr_restart, | |
1000 | bgp_graceful_restart_timer_expire, | |
1001 | peer->v_gr_restart); | |
1002 | BGP_TIMER_ON(peer->t_gr_stale, | |
1003 | bgp_graceful_stale_timer_expire, | |
1004 | peer->bgp->stalepath_time); | |
1005 | } else { | |
1006 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1007 | ||
1008 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
1009 | for (safi = SAFI_UNICAST; | |
a08ca0a7 | 1010 | safi <= SAFI_MPLS_VPN; safi++) |
d62a17ae | 1011 | peer->nsf[afi][safi] = 0; |
1012 | } | |
1013 | ||
1014 | /* set last reset time */ | |
1015 | peer->resettime = peer->uptime = bgp_clock(); | |
1016 | ||
1017 | if (BGP_DEBUG(update_groups, UPDATE_GROUPS)) | |
1018 | zlog_debug("%s remove from all update group", | |
1019 | peer->host); | |
1020 | update_group_remove_peer_afs(peer); | |
1021 | ||
1022 | hook_call(peer_backward_transition, peer); | |
1023 | ||
1024 | /* Reset peer synctime */ | |
1025 | peer->synctime = 0; | |
1026 | ||
1027 | bgp_bfd_deregister_peer(peer); | |
93406d87 | 1028 | } |
93406d87 | 1029 | |
d62a17ae | 1030 | /* Stop read and write threads when exists. */ |
1031 | BGP_READ_OFF(peer->t_read); | |
d3ecc69e | 1032 | peer_writes_off(peer); |
d62a17ae | 1033 | |
1034 | /* Stop all timers. */ | |
1035 | BGP_TIMER_OFF(peer->t_start); | |
1036 | BGP_TIMER_OFF(peer->t_connect); | |
1037 | BGP_TIMER_OFF(peer->t_holdtime); | |
03014d48 | 1038 | peer_keepalives_off(peer); |
d62a17ae | 1039 | BGP_TIMER_OFF(peer->t_routeadv); |
1040 | ||
1041 | /* Stream reset. */ | |
1042 | peer->packet_size = 0; | |
1043 | ||
1044 | /* Clear input and output buffer. */ | |
1045 | if (peer->ibuf) | |
1046 | stream_reset(peer->ibuf); | |
1047 | if (peer->work) | |
1048 | stream_reset(peer->work); | |
d3ecc69e QY |
1049 | |
1050 | pthread_mutex_lock(&peer->obuf_mtx); | |
1051 | { | |
1052 | if (peer->obuf) | |
1053 | stream_fifo_clean(peer->obuf); | |
1054 | } | |
1055 | pthread_mutex_unlock(&peer->obuf_mtx); | |
d62a17ae | 1056 | |
1057 | /* Close of file descriptor. */ | |
1058 | if (peer->fd >= 0) { | |
1059 | close(peer->fd); | |
1060 | peer->fd = -1; | |
93406d87 | 1061 | } |
1062 | ||
05c7a1cc QY |
1063 | FOREACH_AFI_SAFI (afi, safi) { |
1064 | /* Reset all negotiated variables */ | |
1065 | peer->afc_nego[afi][safi] = 0; | |
1066 | peer->afc_adv[afi][safi] = 0; | |
1067 | peer->afc_recv[afi][safi] = 0; | |
1068 | ||
1069 | /* peer address family capability flags*/ | |
1070 | peer->af_cap[afi][safi] = 0; | |
1071 | ||
1072 | /* peer address family status flags*/ | |
1073 | peer->af_sflags[afi][safi] = 0; | |
1074 | ||
1075 | /* Received ORF prefix-filter */ | |
1076 | peer->orf_plist[afi][safi] = NULL; | |
1077 | ||
1078 | if ((peer->status == OpenConfirm) | |
1079 | || (peer->status == Established)) { | |
1080 | /* ORF received prefix-filter pnt */ | |
1081 | sprintf(orf_name, "%s.%d.%d", peer->host, afi, safi); | |
1082 | prefix_bgp_orf_remove_all(afi, orf_name); | |
d62a17ae | 1083 | } |
05c7a1cc | 1084 | } |
d62a17ae | 1085 | |
1086 | /* Reset keepalive and holdtime */ | |
d25e4efc | 1087 | if (PEER_OR_GROUP_TIMER_SET(peer)) { |
d62a17ae | 1088 | peer->v_keepalive = peer->keepalive; |
1089 | peer->v_holdtime = peer->holdtime; | |
1090 | } else { | |
1091 | peer->v_keepalive = peer->bgp->default_keepalive; | |
1092 | peer->v_holdtime = peer->bgp->default_holdtime; | |
1ff9a340 | 1093 | } |
d62a17ae | 1094 | |
1095 | peer->update_time = 0; | |
1096 | ||
1097 | /* Until we are sure that there is no problem about prefix count | |
1098 | this should be commented out.*/ | |
718e3744 | 1099 | #if 0 |
1100 | /* Reset prefix count */ | |
1101 | peer->pcount[AFI_IP][SAFI_UNICAST] = 0; | |
1102 | peer->pcount[AFI_IP][SAFI_MULTICAST] = 0; | |
cd1964ff | 1103 | peer->pcount[AFI_IP][SAFI_LABELED_UNICAST] = 0; |
718e3744 | 1104 | peer->pcount[AFI_IP][SAFI_MPLS_VPN] = 0; |
1105 | peer->pcount[AFI_IP6][SAFI_UNICAST] = 0; | |
1106 | peer->pcount[AFI_IP6][SAFI_MULTICAST] = 0; | |
cd1964ff | 1107 | peer->pcount[AFI_IP6][SAFI_LABELED_UNICAST] = 0; |
718e3744 | 1108 | #endif /* 0 */ |
1109 | ||
d62a17ae | 1110 | if (!CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE) |
1111 | && !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
1112 | peer_delete(peer); | |
1113 | ret = -1; | |
1114 | } else { | |
1115 | bgp_peer_conf_if_to_su_update(peer); | |
1116 | } | |
1117 | ||
1118 | return ret; | |
718e3744 | 1119 | } |
1120 | ||
1121 | /* BGP peer is stoped by the error. */ | |
d62a17ae | 1122 | static int bgp_stop_with_error(struct peer *peer) |
718e3744 | 1123 | { |
d62a17ae | 1124 | /* Double start timer. */ |
1125 | peer->v_start *= 2; | |
1126 | ||
1127 | /* Overflow check. */ | |
1128 | if (peer->v_start >= (60 * 2)) | |
1129 | peer->v_start = (60 * 2); | |
1130 | ||
1131 | if (peer_dynamic_neighbor(peer)) { | |
1132 | if (bgp_debug_neighbor_events(peer)) | |
1133 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1134 | peer_delete(peer); | |
1135 | return -1; | |
1136 | } | |
1137 | ||
1138 | return (bgp_stop(peer)); | |
718e3744 | 1139 | } |
1140 | ||
397b5bde LR |
1141 | |
1142 | /* something went wrong, send notify and tear down */ | |
d62a17ae | 1143 | static int bgp_stop_with_notify(struct peer *peer, u_char code, u_char sub_code) |
397b5bde | 1144 | { |
d62a17ae | 1145 | /* Send notify to remote peer */ |
1146 | bgp_notify_send(peer, code, sub_code); | |
1147 | ||
1148 | if (peer_dynamic_neighbor(peer)) { | |
1149 | if (bgp_debug_neighbor_events(peer)) | |
1150 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1151 | peer_delete(peer); | |
1152 | return -1; | |
1153 | } | |
f14e6fdb | 1154 | |
d62a17ae | 1155 | /* Clear start timer value to default. */ |
1156 | peer->v_start = BGP_INIT_START_TIMER; | |
397b5bde | 1157 | |
d62a17ae | 1158 | return (bgp_stop(peer)); |
397b5bde LR |
1159 | } |
1160 | ||
07a16526 QY |
1161 | /** |
1162 | * Determines whether a TCP session has successfully established for a peer and | |
1163 | * events as appropriate. | |
1164 | * | |
1165 | * This function is called when setting up a new session. After connect() is | |
1166 | * called on the peer's socket (in bgp_start()), the fd is passed to select() | |
1167 | * to wait for connection success or failure. When select() returns, this | |
1168 | * function is called to evaluate the result. | |
1169 | */ | |
1170 | static int bgp_connect_check(struct thread *thread) | |
1171 | { | |
1172 | int status; | |
1173 | socklen_t slen; | |
1174 | int ret; | |
1175 | struct peer *peer; | |
1176 | ||
1177 | peer = THREAD_ARG(thread); | |
1178 | ||
dc1188bb QY |
1179 | /* This value needs to be unset in order for bgp_read() to be scheduled |
1180 | */ | |
1181 | BGP_READ_OFF(peer->t_read); | |
1182 | ||
07a16526 QY |
1183 | /* Check file descriptor. */ |
1184 | slen = sizeof(status); | |
1185 | ret = getsockopt(peer->fd, SOL_SOCKET, SO_ERROR, (void *)&status, | |
1186 | &slen); | |
1187 | ||
1188 | /* If getsockopt is fail, this is fatal error. */ | |
1189 | if (ret < 0) { | |
1190 | zlog_info("can't get sockopt for nonblocking connect"); | |
1191 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
1192 | return -1; | |
1193 | } | |
1194 | ||
1195 | /* When status is 0 then TCP connection is established. */ | |
1196 | if (status == 0) { | |
1197 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
1198 | return 1; | |
1199 | } else { | |
1200 | if (bgp_debug_neighbor_events(peer)) | |
1201 | zlog_debug("%s [Event] Connect failed (%s)", peer->host, | |
1202 | safe_strerror(errno)); | |
1203 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1204 | return 0; | |
1205 | } | |
1206 | } | |
397b5bde | 1207 | |
718e3744 | 1208 | /* TCP connection open. Next we send open message to remote peer. And |
1209 | add read thread for reading open message. */ | |
d62a17ae | 1210 | static int bgp_connect_success(struct peer *peer) |
718e3744 | 1211 | { |
d62a17ae | 1212 | if (peer->fd < 0) { |
1213 | zlog_err("bgp_connect_success peer's fd is negative value %d", | |
1214 | peer->fd); | |
1215 | bgp_stop(peer); | |
1216 | return -1; | |
1217 | } | |
1218 | ||
d3ecc69e QY |
1219 | peer_writes_on(peer); |
1220 | ||
d62a17ae | 1221 | if (bgp_getsockname(peer) < 0) { |
1222 | zlog_err("%s: bgp_getsockname(): failed for peer %s, fd %d", | |
1223 | __FUNCTION__, peer->host, peer->fd); | |
1224 | bgp_notify_send(peer, BGP_NOTIFY_FSM_ERR, | |
1225 | 0); /* internal error */ | |
1226 | return -1; | |
1227 | } | |
1228 | ||
1229 | BGP_READ_ON(peer->t_read, bgp_read, peer->fd); | |
1230 | ||
1231 | if (bgp_debug_neighbor_events(peer)) { | |
1232 | char buf1[SU_ADDRSTRLEN]; | |
1233 | ||
1234 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) | |
1235 | zlog_debug("%s open active, local address %s", | |
1236 | peer->host, | |
1237 | sockunion2str(peer->su_local, buf1, | |
1238 | SU_ADDRSTRLEN)); | |
1239 | else | |
1240 | zlog_debug("%s passive open", peer->host); | |
1241 | } | |
1242 | ||
1243 | bgp_open_send(peer); | |
1244 | ||
1245 | return 0; | |
718e3744 | 1246 | } |
1247 | ||
1248 | /* TCP connect fail */ | |
d62a17ae | 1249 | static int bgp_connect_fail(struct peer *peer) |
718e3744 | 1250 | { |
d62a17ae | 1251 | if (peer_dynamic_neighbor(peer)) { |
1252 | if (bgp_debug_neighbor_events(peer)) | |
1253 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1254 | peer_delete(peer); | |
1255 | return -1; | |
1256 | } | |
1257 | ||
1258 | return (bgp_stop(peer)); | |
718e3744 | 1259 | } |
1260 | ||
1261 | /* This function is the first starting point of all BGP connection. It | |
1262 | try to connect to remote peer with non-blocking IO. */ | |
d62a17ae | 1263 | int bgp_start(struct peer *peer) |
718e3744 | 1264 | { |
d62a17ae | 1265 | int status; |
1266 | int connected = 0; | |
1267 | ||
1268 | bgp_peer_conf_if_to_su_update(peer); | |
1269 | ||
1270 | if (peer->su.sa.sa_family == AF_UNSPEC) { | |
1271 | if (bgp_debug_neighbor_events(peer)) | |
1272 | zlog_debug( | |
1273 | "%s [FSM] Unable to get neighbor's IP address, waiting...", | |
1274 | peer->host); | |
1275 | return -1; | |
1276 | } | |
1277 | ||
1278 | if (BGP_PEER_START_SUPPRESSED(peer)) { | |
1279 | if (bgp_debug_neighbor_events(peer)) | |
1280 | zlog_err( | |
1281 | "%s [FSM] Trying to start suppressed peer" | |
1282 | " - this is never supposed to happen!", | |
1283 | peer->host); | |
1284 | return -1; | |
1285 | } | |
1286 | ||
1287 | /* Scrub some information that might be left over from a previous, | |
1288 | * session | |
1289 | */ | |
1290 | /* Connection information. */ | |
1291 | if (peer->su_local) { | |
1292 | sockunion_free(peer->su_local); | |
1293 | peer->su_local = NULL; | |
1294 | } | |
1295 | ||
1296 | if (peer->su_remote) { | |
1297 | sockunion_free(peer->su_remote); | |
1298 | peer->su_remote = NULL; | |
1299 | } | |
1300 | ||
1301 | /* Clear remote router-id. */ | |
1302 | peer->remote_id.s_addr = 0; | |
1303 | ||
1304 | /* Clear peer capability flag. */ | |
1305 | peer->cap = 0; | |
1306 | ||
1307 | /* If the peer is passive mode, force to move to Active mode. */ | |
1308 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE)) { | |
1309 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1310 | return 0; | |
1311 | } | |
1312 | ||
1313 | /* Register to be notified on peer up */ | |
1314 | if (peer->sort == BGP_PEER_EBGP && peer->ttl == 1 | |
1315 | && !CHECK_FLAG(peer->flags, PEER_FLAG_DISABLE_CONNECTED_CHECK) | |
1316 | && !bgp_flag_check(peer->bgp, BGP_FLAG_DISABLE_NH_CONNECTED_CHK)) | |
1317 | connected = 1; | |
1318 | else | |
1319 | connected = 0; | |
1320 | ||
1321 | if (!bgp_find_or_add_nexthop(peer->bgp, | |
1322 | family2afi(peer->su.sa.sa_family), NULL, | |
1323 | peer, connected)) { | |
1324 | #if defined(HAVE_CUMULUS) | |
1325 | if (bgp_debug_neighbor_events(peer)) | |
1326 | zlog_debug("%s [FSM] Waiting for NHT", peer->host); | |
1327 | ||
1328 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1329 | return 0; | |
b5826a12 | 1330 | #endif |
718e3744 | 1331 | } |
d62a17ae | 1332 | |
1333 | status = bgp_connect(peer); | |
1334 | ||
1335 | switch (status) { | |
1336 | case connect_error: | |
1337 | if (bgp_debug_neighbor_events(peer)) | |
1338 | zlog_debug("%s [FSM] Connect error", peer->host); | |
1339 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1340 | break; | |
1341 | case connect_success: | |
1342 | if (bgp_debug_neighbor_events(peer)) | |
1343 | zlog_debug( | |
1344 | "%s [FSM] Connect immediately success, fd %d", | |
1345 | peer->host, peer->fd); | |
1346 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
1347 | break; | |
1348 | case connect_in_progress: | |
1349 | /* To check nonblocking connect, we wait until socket is | |
1350 | readable or writable. */ | |
1351 | if (bgp_debug_neighbor_events(peer)) | |
1352 | zlog_debug( | |
1353 | "%s [FSM] Non blocking connect waiting result, fd %d", | |
1354 | peer->host, peer->fd); | |
1355 | if (peer->fd < 0) { | |
1356 | zlog_err("bgp_start peer's fd is negative value %d", | |
1357 | peer->fd); | |
1358 | return -1; | |
1359 | } | |
07a16526 QY |
1360 | // when the socket becomes ready (or fails to connect), |
1361 | // bgp_connect_check | |
1362 | // will be called. | |
dc1188bb | 1363 | BGP_READ_ON(peer->t_read, bgp_connect_check, peer->fd); |
d62a17ae | 1364 | break; |
1365 | } | |
1366 | return 0; | |
718e3744 | 1367 | } |
1368 | ||
1369 | /* Connect retry timer is expired when the peer status is Connect. */ | |
d62a17ae | 1370 | static int bgp_reconnect(struct peer *peer) |
718e3744 | 1371 | { |
d62a17ae | 1372 | if (bgp_stop(peer) < 0) |
1373 | return -1; | |
1ff9a340 | 1374 | |
d62a17ae | 1375 | bgp_start(peer); |
1376 | return 0; | |
718e3744 | 1377 | } |
1378 | ||
d62a17ae | 1379 | static int bgp_fsm_open(struct peer *peer) |
718e3744 | 1380 | { |
d62a17ae | 1381 | /* Send keepalive and make keepalive timer */ |
1382 | bgp_keepalive_send(peer); | |
718e3744 | 1383 | |
d62a17ae | 1384 | /* Reset holdtimer value. */ |
1385 | BGP_TIMER_OFF(peer->t_holdtime); | |
718e3744 | 1386 | |
d62a17ae | 1387 | return 0; |
718e3744 | 1388 | } |
1389 | ||
397b5bde LR |
1390 | /* FSM error, unexpected event. This is error of BGP connection. So cut the |
1391 | peer and change to Idle status. */ | |
d62a17ae | 1392 | static int bgp_fsm_event_error(struct peer *peer) |
397b5bde | 1393 | { |
d62a17ae | 1394 | zlog_err("%s [FSM] unexpected packet received in state %s", peer->host, |
1395 | lookup_msg(bgp_status_msg, peer->status, NULL)); | |
397b5bde | 1396 | |
d62a17ae | 1397 | return bgp_stop_with_notify(peer, BGP_NOTIFY_FSM_ERR, 0); |
397b5bde LR |
1398 | } |
1399 | ||
718e3744 | 1400 | /* Hold timer expire. This is error of BGP connection. So cut the |
1401 | peer and change to Idle status. */ | |
d62a17ae | 1402 | static int bgp_fsm_holdtime_expire(struct peer *peer) |
718e3744 | 1403 | { |
d62a17ae | 1404 | if (bgp_debug_neighbor_events(peer)) |
1405 | zlog_debug("%s [FSM] Hold timer expire", peer->host); | |
718e3744 | 1406 | |
d62a17ae | 1407 | return bgp_stop_with_notify(peer, BGP_NOTIFY_HOLD_ERR, 0); |
718e3744 | 1408 | } |
1409 | ||
727c4f87 QY |
1410 | /** |
1411 | * Transition to Established state. | |
1412 | * | |
1413 | * Convert peer from stub to full fledged peer, set some timers, and generate | |
1414 | * initial updates. | |
1415 | */ | |
d62a17ae | 1416 | static int bgp_establish(struct peer *peer) |
718e3744 | 1417 | { |
d62a17ae | 1418 | afi_t afi; |
1419 | safi_t safi; | |
1420 | int nsf_af_count = 0; | |
1421 | int ret = 0; | |
1422 | struct peer *other; | |
1423 | ||
1424 | other = peer->doppelganger; | |
1425 | peer = peer_xfer_conn(peer); | |
1426 | if (!peer) { | |
1427 | zlog_err("%%Neighbor failed in xfer_conn"); | |
1428 | return -1; | |
93406d87 | 1429 | } |
93406d87 | 1430 | |
d62a17ae | 1431 | if (other == peer) |
9d303b37 DL |
1432 | ret = |
1433 | 1; /* bgp_establish specific code when xfer_conn | |
1434 | happens. */ | |
d62a17ae | 1435 | |
1436 | /* Reset capability open status flag. */ | |
1437 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN)) | |
1438 | SET_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN); | |
1439 | ||
1440 | /* Clear start timer value to default. */ | |
1441 | peer->v_start = BGP_INIT_START_TIMER; | |
1442 | ||
1443 | /* Increment established count. */ | |
1444 | peer->established++; | |
1445 | bgp_fsm_change_status(peer, Established); | |
1446 | ||
1447 | /* bgp log-neighbor-changes of neighbor Up */ | |
1448 | if (bgp_flag_check(peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { | |
1449 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); | |
1450 | zlog_info("%%ADJCHANGE: neighbor %s(%s) in vrf %s Up", | |
1451 | peer->host, | |
1452 | (peer->hostname) ? peer->hostname : "Unknown", | |
1453 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) ? vrf->name | |
1454 | : "Default") | |
1455 | : ""); | |
1456 | } | |
1457 | /* assign update-group/subgroup */ | |
1458 | update_group_adjust_peer_afs(peer); | |
1459 | ||
1460 | /* graceful restart */ | |
1461 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
1462 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 1463 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) { |
d62a17ae | 1464 | if (peer->afc_nego[afi][safi] |
1465 | && CHECK_FLAG(peer->cap, PEER_CAP_RESTART_ADV) | |
1466 | && CHECK_FLAG(peer->af_cap[afi][safi], | |
1467 | PEER_CAP_RESTART_AF_RCV)) { | |
1468 | if (peer->nsf[afi][safi] | |
1469 | && !CHECK_FLAG( | |
1470 | peer->af_cap[afi][safi], | |
1471 | PEER_CAP_RESTART_AF_PRESERVE_RCV)) | |
1472 | bgp_clear_stale_route(peer, afi, safi); | |
1473 | ||
1474 | peer->nsf[afi][safi] = 1; | |
1475 | nsf_af_count++; | |
1476 | } else { | |
1477 | if (peer->nsf[afi][safi]) | |
1478 | bgp_clear_stale_route(peer, afi, safi); | |
1479 | peer->nsf[afi][safi] = 0; | |
1480 | } | |
1481 | } | |
1482 | ||
1483 | if (nsf_af_count) | |
1484 | SET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1485 | else { | |
1486 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1487 | if (peer->t_gr_stale) { | |
1488 | BGP_TIMER_OFF(peer->t_gr_stale); | |
1489 | if (bgp_debug_neighbor_events(peer)) | |
1490 | zlog_debug( | |
1491 | "%s graceful restart stalepath timer stopped", | |
1492 | peer->host); | |
1493 | } | |
1494 | } | |
93406d87 | 1495 | |
d62a17ae | 1496 | if (peer->t_gr_restart) { |
1497 | BGP_TIMER_OFF(peer->t_gr_restart); | |
1498 | if (bgp_debug_neighbor_events(peer)) | |
1499 | zlog_debug("%s graceful restart timer stopped", | |
1500 | peer->host); | |
1501 | } | |
718e3744 | 1502 | |
d62a17ae | 1503 | hook_call(peer_established, peer); |
1504 | ||
1505 | /* Reset uptime, send keepalive, send current table. */ | |
1506 | peer->uptime = bgp_clock(); | |
1507 | ||
1508 | /* Send route-refresh when ORF is enabled */ | |
05c7a1cc QY |
1509 | FOREACH_AFI_SAFI (afi, safi) { |
1510 | if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1511 | PEER_CAP_ORF_PREFIX_SM_ADV)) { | |
d62a17ae | 1512 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc QY |
1513 | PEER_CAP_ORF_PREFIX_RM_RCV)) |
1514 | bgp_route_refresh_send(peer, afi, safi, | |
1515 | ORF_TYPE_PREFIX, | |
1516 | REFRESH_IMMEDIATE, 0); | |
1517 | else if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1518 | PEER_CAP_ORF_PREFIX_RM_OLD_RCV)) | |
1519 | bgp_route_refresh_send(peer, afi, safi, | |
1520 | ORF_TYPE_PREFIX_OLD, | |
1521 | REFRESH_IMMEDIATE, 0); | |
1522 | } | |
1523 | } | |
d62a17ae | 1524 | |
1525 | /* First update is deferred until ORF or ROUTE-REFRESH is received */ | |
05c7a1cc QY |
1526 | FOREACH_AFI_SAFI (afi, safi) { |
1527 | if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1528 | PEER_CAP_ORF_PREFIX_RM_ADV)) | |
d62a17ae | 1529 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc QY |
1530 | PEER_CAP_ORF_PREFIX_SM_RCV) |
1531 | || CHECK_FLAG(peer->af_cap[afi][safi], | |
1532 | PEER_CAP_ORF_PREFIX_SM_OLD_RCV)) | |
1533 | SET_FLAG(peer->af_sflags[afi][safi], | |
1534 | PEER_STATUS_ORF_WAIT_REFRESH); | |
1535 | } | |
d62a17ae | 1536 | |
1537 | bgp_announce_peer(peer); | |
1538 | ||
1539 | /* Start the route advertisement timer to send updates to the peer - if | |
1540 | * BGP | |
1541 | * is not in read-only mode. If it is, the timer will be started at the | |
1542 | * end | |
1543 | * of read-only mode. | |
1544 | */ | |
1545 | if (!bgp_update_delay_active(peer->bgp)) { | |
1546 | BGP_TIMER_OFF(peer->t_routeadv); | |
1547 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
1548 | } | |
718e3744 | 1549 | |
d62a17ae | 1550 | if (peer->doppelganger && (peer->doppelganger->status != Deleted)) { |
1551 | if (bgp_debug_neighbor_events(peer)) | |
1552 | zlog_debug( | |
1553 | "[Event] Deleting stub connection for peer %s", | |
1554 | peer->host); | |
1555 | ||
1556 | if (peer->doppelganger->status > Active) | |
1557 | bgp_notify_send(peer->doppelganger, BGP_NOTIFY_CEASE, | |
1558 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
1559 | else | |
1560 | peer_delete(peer->doppelganger); | |
718e3744 | 1561 | } |
1562 | ||
d62a17ae | 1563 | bgp_bfd_register_peer(peer); |
1564 | return ret; | |
718e3744 | 1565 | } |
1566 | ||
1567 | /* Keepalive packet is received. */ | |
d62a17ae | 1568 | static int bgp_fsm_keepalive(struct peer *peer) |
718e3744 | 1569 | { |
d62a17ae | 1570 | bgp_update_implicit_eors(peer); |
f188f2c4 | 1571 | |
d62a17ae | 1572 | /* peer count update */ |
1573 | peer->keepalive_in++; | |
718e3744 | 1574 | |
d62a17ae | 1575 | BGP_TIMER_OFF(peer->t_holdtime); |
1576 | return 0; | |
718e3744 | 1577 | } |
1578 | ||
1579 | /* Update packet is received. */ | |
d62a17ae | 1580 | static int bgp_fsm_update(struct peer *peer) |
718e3744 | 1581 | { |
d62a17ae | 1582 | BGP_TIMER_OFF(peer->t_holdtime); |
1583 | return 0; | |
718e3744 | 1584 | } |
1585 | ||
1586 | /* This is empty event. */ | |
d62a17ae | 1587 | static int bgp_ignore(struct peer *peer) |
718e3744 | 1588 | { |
d62a17ae | 1589 | zlog_err( |
1590 | "%s [FSM] Ignoring event %s in state %s, prior events %s, %s, fd %d", | |
1591 | peer->host, bgp_event_str[peer->cur_event], | |
1592 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1593 | bgp_event_str[peer->last_event], | |
1594 | bgp_event_str[peer->last_major_event], peer->fd); | |
1595 | return 0; | |
718e3744 | 1596 | } |
6b0655a2 | 1597 | |
6403814c | 1598 | /* This is to handle unexpected events.. */ |
d62a17ae | 1599 | static int bgp_fsm_exeption(struct peer *peer) |
6403814c | 1600 | { |
d62a17ae | 1601 | zlog_err( |
1602 | "%s [FSM] Unexpected event %s in state %s, prior events %s, %s, fd %d", | |
1603 | peer->host, bgp_event_str[peer->cur_event], | |
1604 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1605 | bgp_event_str[peer->last_event], | |
1606 | bgp_event_str[peer->last_major_event], peer->fd); | |
1607 | return (bgp_stop(peer)); | |
6403814c DS |
1608 | } |
1609 | ||
d62a17ae | 1610 | void bgp_fsm_nht_update(struct peer *peer, int valid) |
fc9a856f | 1611 | { |
d62a17ae | 1612 | if (!peer) |
1613 | return; | |
1614 | ||
1615 | switch (peer->status) { | |
1616 | case Idle: | |
1617 | if (valid) | |
1618 | BGP_EVENT_ADD(peer, BGP_Start); | |
1619 | break; | |
1620 | case Connect: | |
1621 | if (!valid) { | |
1622 | BGP_TIMER_OFF(peer->t_connect); | |
1623 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
1624 | } | |
1625 | break; | |
1626 | case Active: | |
1627 | if (valid) { | |
1628 | BGP_TIMER_OFF(peer->t_connect); | |
1629 | BGP_EVENT_ADD(peer, ConnectRetry_timer_expired); | |
1630 | } | |
1631 | break; | |
1632 | case OpenSent: | |
1633 | case OpenConfirm: | |
1634 | case Established: | |
1635 | if (!valid && (peer->gtsm_hops == 1)) | |
1636 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
1637 | case Clearing: | |
1638 | case Deleted: | |
1639 | default: | |
1640 | break; | |
fc9a856f | 1641 | } |
fc9a856f DS |
1642 | } |
1643 | ||
1644 | ||
718e3744 | 1645 | /* Finite State Machine structure */ |
fda1d3e0 | 1646 | static const struct { |
d62a17ae | 1647 | int (*func)(struct peer *); |
1648 | int next_state; | |
1649 | } FSM[BGP_STATUS_MAX - 1][BGP_EVENTS_MAX - 1] = { | |
1650 | { | |
1651 | /* Idle state: In Idle state, all events other than BGP_Start is | |
1652 | ignored. With BGP_Start event, finite state machine calls | |
1653 | bgp_start(). */ | |
1654 | {bgp_start, Connect}, /* BGP_Start */ | |
1655 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1656 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1657 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1658 | {bgp_ignore, Idle}, /* TCP_connection_open_failed */ | |
1659 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1660 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ | |
1661 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
1662 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
1663 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
1664 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
1665 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
1666 | {bgp_ignore, Idle}, /* Receive_NOTIFICATION_message */ | |
1667 | {bgp_ignore, Idle}, /* Clearing_Completed */ | |
1668 | }, | |
1669 | { | |
1670 | /* Connect */ | |
1671 | {bgp_ignore, Connect}, /* BGP_Start */ | |
1672 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1673 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1674 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1675 | {bgp_connect_fail, Active}, /* TCP_connection_open_failed */ | |
1676 | {bgp_connect_fail, Idle}, /* TCP_fatal_error */ | |
1677 | {bgp_reconnect, Connect}, /* ConnectRetry_timer_expired */ | |
1678 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ | |
1679 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1680 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1681 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
1682 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1683 | {bgp_stop, Idle}, /* Receive_NOTIFICATION_message */ | |
1684 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1685 | }, | |
1686 | { | |
1687 | /* Active, */ | |
1688 | {bgp_ignore, Active}, /* BGP_Start */ | |
1689 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1690 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1691 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1692 | {bgp_ignore, Active}, /* TCP_connection_open_failed */ | |
1693 | {bgp_fsm_exeption, Idle}, /* TCP_fatal_error */ | |
1694 | {bgp_start, Connect}, /* ConnectRetry_timer_expired */ | |
1695 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ | |
1696 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1697 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1698 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
1699 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1700 | {bgp_fsm_exeption, Idle}, /* Receive_NOTIFICATION_message */ | |
1701 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1702 | }, | |
1703 | { | |
1704 | /* OpenSent, */ | |
1705 | {bgp_ignore, OpenSent}, /* BGP_Start */ | |
1706 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1707 | {bgp_stop, Active}, /* TCP_connection_open */ | |
1708 | {bgp_stop, Active}, /* TCP_connection_closed */ | |
1709 | {bgp_stop, Active}, /* TCP_connection_open_failed */ | |
1710 | {bgp_stop, Active}, /* TCP_fatal_error */ | |
1711 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ | |
1712 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
1713 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1714 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ | |
1715 | {bgp_fsm_event_error, Idle}, /* Receive_KEEPALIVE_message */ | |
1716 | {bgp_fsm_event_error, Idle}, /* Receive_UPDATE_message */ | |
1717 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
1718 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1719 | }, | |
1720 | { | |
1721 | /* OpenConfirm, */ | |
1722 | {bgp_ignore, OpenConfirm}, /* BGP_Start */ | |
1723 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1724 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1725 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1726 | {bgp_stop, Idle}, /* TCP_connection_open_failed */ | |
1727 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1728 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ | |
1729 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
1730 | {bgp_ignore, OpenConfirm}, /* KeepAlive_timer_expired */ | |
1731 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1732 | {bgp_establish, Established}, /* Receive_KEEPALIVE_message */ | |
1733 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1734 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
1735 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1736 | }, | |
1737 | { | |
1738 | /* Established, */ | |
1739 | {bgp_ignore, Established}, /* BGP_Start */ | |
1740 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
1741 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1742 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
1743 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
1744 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
1745 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
1746 | {bgp_fsm_holdtime_expire, Clearing}, /* Hold_Timer_expired */ | |
03014d48 QY |
1747 | {bgp_ignore, Established}, /* KeepAlive_timer_expired */ |
1748 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
d62a17ae | 1749 | {bgp_fsm_keepalive, |
1750 | Established}, /* Receive_KEEPALIVE_message */ | |
1751 | {bgp_fsm_update, Established}, /* Receive_UPDATE_message */ | |
1752 | {bgp_stop_with_error, | |
1753 | Clearing}, /* Receive_NOTIFICATION_message */ | |
1754 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1755 | }, | |
1756 | { | |
1757 | /* Clearing, */ | |
1758 | {bgp_ignore, Clearing}, /* BGP_Start */ | |
1759 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
1760 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1761 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
1762 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
1763 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
1764 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
1765 | {bgp_stop, Clearing}, /* Hold_Timer_expired */ | |
1766 | {bgp_stop, Clearing}, /* KeepAlive_timer_expired */ | |
1767 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
1768 | {bgp_stop, Clearing}, /* Receive_KEEPALIVE_message */ | |
1769 | {bgp_stop, Clearing}, /* Receive_UPDATE_message */ | |
1770 | {bgp_stop, Clearing}, /* Receive_NOTIFICATION_message */ | |
1771 | {bgp_clearing_completed, Idle}, /* Clearing_Completed */ | |
1772 | }, | |
1773 | { | |
1774 | /* Deleted, */ | |
1775 | {bgp_ignore, Deleted}, /* BGP_Start */ | |
1776 | {bgp_ignore, Deleted}, /* BGP_Stop */ | |
1777 | {bgp_ignore, Deleted}, /* TCP_connection_open */ | |
1778 | {bgp_ignore, Deleted}, /* TCP_connection_closed */ | |
1779 | {bgp_ignore, Deleted}, /* TCP_connection_open_failed */ | |
1780 | {bgp_ignore, Deleted}, /* TCP_fatal_error */ | |
1781 | {bgp_ignore, Deleted}, /* ConnectRetry_timer_expired */ | |
1782 | {bgp_ignore, Deleted}, /* Hold_Timer_expired */ | |
1783 | {bgp_ignore, Deleted}, /* KeepAlive_timer_expired */ | |
1784 | {bgp_ignore, Deleted}, /* Receive_OPEN_message */ | |
1785 | {bgp_ignore, Deleted}, /* Receive_KEEPALIVE_message */ | |
1786 | {bgp_ignore, Deleted}, /* Receive_UPDATE_message */ | |
1787 | {bgp_ignore, Deleted}, /* Receive_NOTIFICATION_message */ | |
1788 | {bgp_ignore, Deleted}, /* Clearing_Completed */ | |
1789 | }, | |
718e3744 | 1790 | }; |
1791 | ||
718e3744 | 1792 | /* Execute event process. */ |
d62a17ae | 1793 | int bgp_event(struct thread *thread) |
718e3744 | 1794 | { |
d62a17ae | 1795 | int event; |
1796 | struct peer *peer; | |
1797 | int ret; | |
718e3744 | 1798 | |
d62a17ae | 1799 | peer = THREAD_ARG(thread); |
1800 | event = THREAD_VAL(thread); | |
718e3744 | 1801 | |
d62a17ae | 1802 | ret = bgp_event_update(peer, event); |
1ff9a340 | 1803 | |
d62a17ae | 1804 | return (ret); |
1ff9a340 DS |
1805 | } |
1806 | ||
d62a17ae | 1807 | int bgp_event_update(struct peer *peer, int event) |
1ff9a340 | 1808 | { |
d62a17ae | 1809 | int next; |
1810 | int ret = 0; | |
1811 | struct peer *other; | |
1812 | int passive_conn = 0; | |
1813 | int dyn_nbr; | |
1814 | ||
1815 | other = peer->doppelganger; | |
1816 | passive_conn = | |
1817 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) ? 1 : 0; | |
1818 | dyn_nbr = peer_dynamic_neighbor(peer); | |
1819 | ||
1820 | /* Logging this event. */ | |
1821 | next = FSM[peer->status - 1][event - 1].next_state; | |
1822 | ||
1823 | if (bgp_debug_neighbor_events(peer) && peer->status != next) | |
1824 | zlog_debug("%s [FSM] %s (%s->%s), fd %d", peer->host, | |
1825 | bgp_event_str[event], | |
1826 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1827 | lookup_msg(bgp_status_msg, next, NULL), peer->fd); | |
1828 | ||
1829 | peer->last_event = peer->cur_event; | |
1830 | peer->cur_event = event; | |
1831 | ||
1832 | /* Call function. */ | |
1833 | if (FSM[peer->status - 1][event - 1].func) | |
1834 | ret = (*(FSM[peer->status - 1][event - 1].func))(peer); | |
1835 | ||
1836 | /* When function do not want proceed next job return -1. */ | |
1837 | if (ret >= 0) { | |
1838 | if (ret == 1 && next == Established) { | |
1839 | /* The case when doppelganger swap accurred in | |
1840 | bgp_establish. | |
1841 | Update the peer pointer accordingly */ | |
1842 | peer = other; | |
1843 | } | |
1844 | ||
1845 | /* If status is changed. */ | |
1846 | if (next != peer->status) | |
1847 | bgp_fsm_change_status(peer, next); | |
1848 | ||
1849 | /* Make sure timer is set. */ | |
1850 | bgp_timer_set(peer); | |
1851 | ||
1852 | } else if (!dyn_nbr && !passive_conn && peer->bgp) { | |
1853 | /* If we got a return value of -1, that means there was an | |
1854 | * error, restart | |
1855 | * the FSM. If the peer structure was deleted | |
1856 | */ | |
1857 | zlog_err( | |
1858 | "%s [FSM] Failure handling event %s in state %s, " | |
1859 | "prior events %s, %s, fd %d", | |
1860 | peer->host, bgp_event_str[peer->cur_event], | |
1861 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1862 | bgp_event_str[peer->last_event], | |
1863 | bgp_event_str[peer->last_major_event], peer->fd); | |
1864 | bgp_stop(peer); | |
1865 | bgp_fsm_change_status(peer, Idle); | |
1866 | bgp_timer_set(peer); | |
1867 | } | |
1868 | return ret; | |
718e3744 | 1869 | } |