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