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