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718e3744 | 1 | /* BGP-4 Finite State Machine |
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 | |
18 | along with GNU Zebra; see the file COPYING. If not, write to the Free | |
19 | Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
21 | ||
22 | #include <zebra.h> | |
23 | ||
24 | #include "linklist.h" | |
25 | #include "prefix.h" | |
26 | #include "vty.h" | |
27 | #include "sockunion.h" | |
28 | #include "thread.h" | |
29 | #include "log.h" | |
30 | #include "stream.h" | |
31 | #include "memory.h" | |
32 | #include "plist.h" | |
33 | ||
34 | #include "bgpd/bgpd.h" | |
35 | #include "bgpd/bgp_attr.h" | |
36 | #include "bgpd/bgp_debug.h" | |
37 | #include "bgpd/bgp_fsm.h" | |
38 | #include "bgpd/bgp_packet.h" | |
39 | #include "bgpd/bgp_network.h" | |
40 | #include "bgpd/bgp_route.h" | |
41 | #include "bgpd/bgp_dump.h" | |
42 | #include "bgpd/bgp_open.h" | |
43 | #ifdef HAVE_SNMP | |
44 | #include "bgpd/bgp_snmp.h" | |
45 | #endif /* HAVE_SNMP */ | |
6b0655a2 | 46 | |
718e3744 | 47 | /* BGP FSM (finite state machine) has three types of functions. Type |
48 | one is thread functions. Type two is event functions. Type three | |
49 | is FSM functions. Timer functions are set by bgp_timer_set | |
50 | function. */ | |
51 | ||
52 | /* BGP event function. */ | |
53 | int bgp_event (struct thread *); | |
54 | ||
55 | /* BGP thread functions. */ | |
56 | static int bgp_start_timer (struct thread *); | |
57 | static int bgp_connect_timer (struct thread *); | |
58 | static int bgp_holdtime_timer (struct thread *); | |
59 | static int bgp_keepalive_timer (struct thread *); | |
60 | ||
61 | /* BGP FSM functions. */ | |
62 | static int bgp_start (struct peer *); | |
63 | ||
64 | /* BGP start timer jitter. */ | |
94f2b392 | 65 | static int |
718e3744 | 66 | bgp_start_jitter (int time) |
67 | { | |
68 | return ((rand () % (time + 1)) - (time / 2)); | |
69 | } | |
70 | ||
ca058a30 PJ |
71 | /* Check if suppress start/restart of sessions to peer. */ |
72 | #define BGP_PEER_START_SUPPRESSED(P) \ | |
73 | (CHECK_FLAG ((P)->flags, PEER_FLAG_SHUTDOWN) \ | |
74 | || CHECK_FLAG ((P)->sflags, PEER_STATUS_PREFIX_OVERFLOW)) | |
75 | ||
718e3744 | 76 | /* Hook function called after bgp event is occered. And vty's |
77 | neighbor command invoke this function after making neighbor | |
78 | structure. */ | |
79 | void | |
80 | bgp_timer_set (struct peer *peer) | |
81 | { | |
82 | int jitter = 0; | |
83 | ||
84 | switch (peer->status) | |
85 | { | |
86 | case Idle: | |
87 | /* First entry point of peer's finite state machine. In Idle | |
88 | status start timer is on unless peer is shutdown or peer is | |
89 | inactive. All other timer must be turned off */ | |
ca058a30 | 90 | if (BGP_PEER_START_SUPPRESSED (peer) || ! peer_active (peer)) |
718e3744 | 91 | { |
92 | BGP_TIMER_OFF (peer->t_start); | |
93 | } | |
94 | else | |
95 | { | |
96 | jitter = bgp_start_jitter (peer->v_start); | |
97 | BGP_TIMER_ON (peer->t_start, bgp_start_timer, | |
98 | peer->v_start + jitter); | |
99 | } | |
100 | BGP_TIMER_OFF (peer->t_connect); | |
101 | BGP_TIMER_OFF (peer->t_holdtime); | |
102 | BGP_TIMER_OFF (peer->t_keepalive); | |
103 | BGP_TIMER_OFF (peer->t_asorig); | |
104 | BGP_TIMER_OFF (peer->t_routeadv); | |
105 | break; | |
106 | ||
107 | case Connect: | |
108 | /* After start timer is expired, the peer moves to Connnect | |
109 | status. Make sure start timer is off and connect timer is | |
110 | on. */ | |
111 | BGP_TIMER_OFF (peer->t_start); | |
112 | BGP_TIMER_ON (peer->t_connect, bgp_connect_timer, peer->v_connect); | |
113 | BGP_TIMER_OFF (peer->t_holdtime); | |
114 | BGP_TIMER_OFF (peer->t_keepalive); | |
115 | BGP_TIMER_OFF (peer->t_asorig); | |
116 | BGP_TIMER_OFF (peer->t_routeadv); | |
117 | break; | |
118 | ||
119 | case Active: | |
120 | /* Active is waiting connection from remote peer. And if | |
121 | connect timer is expired, change status to Connect. */ | |
122 | BGP_TIMER_OFF (peer->t_start); | |
123 | /* If peer is passive mode, do not set connect timer. */ | |
93406d87 | 124 | if (CHECK_FLAG (peer->flags, PEER_FLAG_PASSIVE) |
125 | || CHECK_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT)) | |
718e3744 | 126 | { |
127 | BGP_TIMER_OFF (peer->t_connect); | |
128 | } | |
129 | else | |
130 | { | |
131 | BGP_TIMER_ON (peer->t_connect, bgp_connect_timer, peer->v_connect); | |
132 | } | |
133 | BGP_TIMER_OFF (peer->t_holdtime); | |
134 | BGP_TIMER_OFF (peer->t_keepalive); | |
135 | BGP_TIMER_OFF (peer->t_asorig); | |
136 | BGP_TIMER_OFF (peer->t_routeadv); | |
137 | break; | |
138 | ||
139 | case OpenSent: | |
140 | /* OpenSent status. */ | |
141 | BGP_TIMER_OFF (peer->t_start); | |
142 | BGP_TIMER_OFF (peer->t_connect); | |
143 | if (peer->v_holdtime != 0) | |
144 | { | |
145 | BGP_TIMER_ON (peer->t_holdtime, bgp_holdtime_timer, | |
146 | peer->v_holdtime); | |
147 | } | |
148 | else | |
149 | { | |
150 | BGP_TIMER_OFF (peer->t_holdtime); | |
151 | } | |
152 | BGP_TIMER_OFF (peer->t_keepalive); | |
153 | BGP_TIMER_OFF (peer->t_asorig); | |
154 | BGP_TIMER_OFF (peer->t_routeadv); | |
155 | break; | |
156 | ||
157 | case OpenConfirm: | |
158 | /* OpenConfirm status. */ | |
159 | BGP_TIMER_OFF (peer->t_start); | |
160 | BGP_TIMER_OFF (peer->t_connect); | |
161 | ||
162 | /* If the negotiated Hold Time value is zero, then the Hold Time | |
163 | timer and KeepAlive timers are not started. */ | |
164 | if (peer->v_holdtime == 0) | |
165 | { | |
166 | BGP_TIMER_OFF (peer->t_holdtime); | |
167 | BGP_TIMER_OFF (peer->t_keepalive); | |
168 | } | |
169 | else | |
170 | { | |
171 | BGP_TIMER_ON (peer->t_holdtime, bgp_holdtime_timer, | |
172 | peer->v_holdtime); | |
173 | BGP_TIMER_ON (peer->t_keepalive, bgp_keepalive_timer, | |
174 | peer->v_keepalive); | |
175 | } | |
176 | BGP_TIMER_OFF (peer->t_asorig); | |
177 | BGP_TIMER_OFF (peer->t_routeadv); | |
178 | break; | |
179 | ||
180 | case Established: | |
181 | /* In Established status start and connect timer is turned | |
182 | off. */ | |
183 | BGP_TIMER_OFF (peer->t_start); | |
184 | BGP_TIMER_OFF (peer->t_connect); | |
185 | ||
186 | /* Same as OpenConfirm, if holdtime is zero then both holdtime | |
187 | and keepalive must be turned off. */ | |
188 | if (peer->v_holdtime == 0) | |
189 | { | |
190 | BGP_TIMER_OFF (peer->t_holdtime); | |
191 | BGP_TIMER_OFF (peer->t_keepalive); | |
192 | } | |
193 | else | |
194 | { | |
195 | BGP_TIMER_ON (peer->t_holdtime, bgp_holdtime_timer, | |
196 | peer->v_holdtime); | |
197 | BGP_TIMER_ON (peer->t_keepalive, bgp_keepalive_timer, | |
198 | peer->v_keepalive); | |
199 | } | |
200 | BGP_TIMER_OFF (peer->t_asorig); | |
201 | break; | |
ca058a30 PJ |
202 | case Deleted: |
203 | BGP_TIMER_OFF (peer->t_gr_restart); | |
204 | BGP_TIMER_OFF (peer->t_gr_stale); | |
205 | BGP_TIMER_OFF (peer->t_pmax_restart); | |
206 | case Clearing: | |
207 | BGP_TIMER_OFF (peer->t_start); | |
208 | BGP_TIMER_OFF (peer->t_connect); | |
209 | BGP_TIMER_OFF (peer->t_holdtime); | |
210 | BGP_TIMER_OFF (peer->t_keepalive); | |
211 | BGP_TIMER_OFF (peer->t_asorig); | |
212 | BGP_TIMER_OFF (peer->t_routeadv); | |
718e3744 | 213 | } |
214 | } | |
215 | ||
216 | /* BGP start timer. This function set BGP_Start event to thread value | |
217 | and process event. */ | |
218 | static int | |
219 | bgp_start_timer (struct thread *thread) | |
220 | { | |
221 | struct peer *peer; | |
222 | ||
223 | peer = THREAD_ARG (thread); | |
224 | peer->t_start = NULL; | |
225 | ||
226 | if (BGP_DEBUG (fsm, FSM)) | |
227 | zlog (peer->log, LOG_DEBUG, | |
228 | "%s [FSM] Timer (start timer expire).", peer->host); | |
229 | ||
230 | THREAD_VAL (thread) = BGP_Start; | |
200df115 | 231 | bgp_event (thread); /* bgp_event unlocks peer */ |
718e3744 | 232 | |
233 | return 0; | |
234 | } | |
235 | ||
236 | /* BGP connect retry timer. */ | |
237 | static int | |
238 | bgp_connect_timer (struct thread *thread) | |
239 | { | |
240 | struct peer *peer; | |
241 | ||
242 | peer = THREAD_ARG (thread); | |
243 | peer->t_connect = NULL; | |
244 | ||
245 | if (BGP_DEBUG (fsm, FSM)) | |
246 | zlog (peer->log, LOG_DEBUG, "%s [FSM] Timer (connect timer expire)", | |
247 | peer->host); | |
248 | ||
249 | THREAD_VAL (thread) = ConnectRetry_timer_expired; | |
200df115 | 250 | bgp_event (thread); /* bgp_event unlocks peer */ |
718e3744 | 251 | |
252 | return 0; | |
253 | } | |
254 | ||
255 | /* BGP holdtime timer. */ | |
256 | static int | |
257 | bgp_holdtime_timer (struct thread *thread) | |
258 | { | |
259 | struct peer *peer; | |
260 | ||
261 | peer = THREAD_ARG (thread); | |
262 | peer->t_holdtime = NULL; | |
263 | ||
264 | if (BGP_DEBUG (fsm, FSM)) | |
265 | zlog (peer->log, LOG_DEBUG, | |
266 | "%s [FSM] Timer (holdtime timer expire)", | |
267 | peer->host); | |
268 | ||
269 | THREAD_VAL (thread) = Hold_Timer_expired; | |
200df115 | 270 | bgp_event (thread); /* bgp_event unlocks peer */ |
718e3744 | 271 | |
272 | return 0; | |
273 | } | |
274 | ||
275 | /* BGP keepalive fire ! */ | |
276 | static int | |
277 | bgp_keepalive_timer (struct thread *thread) | |
278 | { | |
279 | struct peer *peer; | |
280 | ||
281 | peer = THREAD_ARG (thread); | |
282 | peer->t_keepalive = NULL; | |
283 | ||
284 | if (BGP_DEBUG (fsm, FSM)) | |
285 | zlog (peer->log, LOG_DEBUG, | |
286 | "%s [FSM] Timer (keepalive timer expire)", | |
287 | peer->host); | |
288 | ||
289 | THREAD_VAL (thread) = KeepAlive_timer_expired; | |
200df115 | 290 | bgp_event (thread); /* bgp_event unlocks peer */ |
718e3744 | 291 | |
292 | return 0; | |
293 | } | |
294 | ||
94f2b392 | 295 | static int |
718e3744 | 296 | bgp_routeadv_timer (struct thread *thread) |
297 | { | |
298 | struct peer *peer; | |
299 | ||
300 | peer = THREAD_ARG (thread); | |
301 | peer->t_routeadv = NULL; | |
302 | ||
303 | if (BGP_DEBUG (fsm, FSM)) | |
304 | zlog (peer->log, LOG_DEBUG, | |
305 | "%s [FSM] Timer (routeadv timer expire)", | |
306 | peer->host); | |
307 | ||
65957886 | 308 | peer->synctime = bgp_clock (); |
718e3744 | 309 | |
eb821189 | 310 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
718e3744 | 311 | |
312 | BGP_TIMER_ON (peer->t_routeadv, bgp_routeadv_timer, | |
313 | peer->v_routeadv); | |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
e0701b79 | 318 | /* BGP Peer Down Cause */ |
fd79ac91 | 319 | const char *peer_down_str[] = |
e0701b79 | 320 | { |
321 | "", | |
322 | "Router ID changed", | |
323 | "Remote AS changed", | |
324 | "Local AS change", | |
325 | "Cluster ID changed", | |
326 | "Confederation identifier changed", | |
327 | "Confederation peer changed", | |
328 | "RR client config change", | |
329 | "RS client config change", | |
330 | "Update source change", | |
331 | "Address family activated", | |
332 | "Admin. shutdown", | |
333 | "User reset", | |
334 | "BGP Notification received", | |
335 | "BGP Notification send", | |
336 | "Peer closed the session", | |
337 | "Neighbor deleted", | |
338 | "Peer-group add member", | |
339 | "Peer-group delete member", | |
340 | "Capability changed", | |
341 | "Passive config change", | |
93406d87 | 342 | "Multihop config change", |
343 | "NSF peer closed the session" | |
e0701b79 | 344 | }; |
345 | ||
94f2b392 | 346 | static int |
93406d87 | 347 | bgp_graceful_restart_timer_expire (struct thread *thread) |
348 | { | |
349 | struct peer *peer; | |
350 | afi_t afi; | |
351 | safi_t safi; | |
352 | ||
353 | peer = THREAD_ARG (thread); | |
354 | peer->t_gr_restart = NULL; | |
355 | ||
356 | /* NSF delete stale route */ | |
357 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
0a28130d | 358 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_3 ; safi++) |
93406d87 | 359 | if (peer->nsf[afi][safi]) |
360 | bgp_clear_stale_route (peer, afi, safi); | |
361 | ||
362 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT); | |
363 | BGP_TIMER_OFF (peer->t_gr_stale); | |
364 | ||
365 | if (BGP_DEBUG (events, EVENTS)) | |
366 | { | |
367 | zlog_debug ("%s graceful restart timer expired", peer->host); | |
368 | zlog_debug ("%s graceful restart stalepath timer stopped", peer->host); | |
369 | } | |
370 | ||
371 | bgp_timer_set (peer); | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
94f2b392 | 376 | static int |
93406d87 | 377 | bgp_graceful_stale_timer_expire (struct thread *thread) |
378 | { | |
379 | struct peer *peer; | |
380 | afi_t afi; | |
381 | safi_t safi; | |
382 | ||
383 | peer = THREAD_ARG (thread); | |
384 | peer->t_gr_stale = NULL; | |
385 | ||
386 | if (BGP_DEBUG (events, EVENTS)) | |
387 | zlog_debug ("%s graceful restart stalepath timer expired", peer->host); | |
388 | ||
389 | /* NSF delete stale route */ | |
390 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
0a28130d | 391 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_3 ; safi++) |
93406d87 | 392 | if (peer->nsf[afi][safi]) |
393 | bgp_clear_stale_route (peer, afi, safi); | |
394 | ||
395 | return 0; | |
396 | } | |
397 | ||
200df115 | 398 | /* Called after event occured, this function change status and reset |
399 | read/write and timer thread. */ | |
400 | void | |
401 | bgp_fsm_change_status (struct peer *peer, int status) | |
402 | { | |
403 | bgp_dump_state (peer, peer->status, status); | |
404 | ||
f2c31acb PJ |
405 | /* Transition into Clearing or Deleted must /always/ clear all routes.. |
406 | * (and must do so before actually changing into Deleted.. | |
407 | */ | |
408 | if (status >= Clearing) | |
409 | bgp_clear_route_all (peer); | |
410 | ||
200df115 | 411 | /* Preserve old status and change into new status. */ |
412 | peer->ostatus = peer->status; | |
413 | peer->status = status; | |
f2c31acb | 414 | |
200df115 | 415 | if (BGP_DEBUG (normal, NORMAL)) |
416 | zlog_debug ("%s went from %s to %s", | |
417 | peer->host, | |
418 | LOOKUP (bgp_status_msg, peer->ostatus), | |
419 | LOOKUP (bgp_status_msg, peer->status)); | |
420 | } | |
421 | ||
3117b5c4 | 422 | /* Flush the event queue and ensure the peer is shut down */ |
9e4ca89c | 423 | static int |
3117b5c4 SH |
424 | bgp_clearing_completed (struct peer *peer) |
425 | { | |
426 | int rc = bgp_stop(peer); | |
427 | BGP_EVENT_FLUSH (peer); | |
428 | ||
429 | return rc; | |
430 | } | |
431 | ||
718e3744 | 432 | /* Administrative BGP peer stop event. */ |
3117b5c4 | 433 | /* May be called multiple times for the same peer */ |
718e3744 | 434 | int |
435 | bgp_stop (struct peer *peer) | |
436 | { | |
718e3744 | 437 | afi_t afi; |
438 | safi_t safi; | |
439 | char orf_name[BUFSIZ]; | |
440 | ||
3117b5c4 SH |
441 | /* Can't do this in Clearing; events are used for state transitions */ |
442 | if (peer->status != Clearing) | |
2158ad23 PJ |
443 | { |
444 | /* Delete all existing events of the peer */ | |
445 | BGP_EVENT_FLUSH (peer); | |
446 | } | |
dcdf399f | 447 | |
718e3744 | 448 | /* Increment Dropped count. */ |
449 | if (peer->status == Established) | |
450 | { | |
718e3744 | 451 | peer->dropped++; |
848973c7 | 452 | |
453 | /* bgp log-neighbor-changes of neighbor Down */ | |
454 | if (bgp_flag_check (peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) | |
e0701b79 | 455 | zlog_info ("%%ADJCHANGE: neighbor %s Down %s", peer->host, |
456 | peer_down_str [(int) peer->last_reset]); | |
848973c7 | 457 | |
93406d87 | 458 | /* graceful restart */ |
459 | if (peer->t_gr_stale) | |
460 | { | |
461 | BGP_TIMER_OFF (peer->t_gr_stale); | |
462 | if (BGP_DEBUG (events, EVENTS)) | |
463 | zlog_debug ("%s graceful restart stalepath timer stopped", peer->host); | |
464 | } | |
465 | if (CHECK_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT)) | |
466 | { | |
467 | if (BGP_DEBUG (events, EVENTS)) | |
468 | { | |
469 | zlog_debug ("%s graceful restart timer started for %d sec", | |
470 | peer->host, peer->v_gr_restart); | |
471 | zlog_debug ("%s graceful restart stalepath timer started for %d sec", | |
472 | peer->host, peer->bgp->stalepath_time); | |
473 | } | |
474 | BGP_TIMER_ON (peer->t_gr_restart, bgp_graceful_restart_timer_expire, | |
475 | peer->v_gr_restart); | |
476 | BGP_TIMER_ON (peer->t_gr_stale, bgp_graceful_stale_timer_expire, | |
477 | peer->bgp->stalepath_time); | |
478 | } | |
479 | else | |
480 | { | |
481 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_MODE); | |
482 | ||
483 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
0a28130d | 484 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_3 ; safi++) |
93406d87 | 485 | peer->nsf[afi][safi] = 0; |
486 | } | |
487 | ||
848973c7 | 488 | /* set last reset time */ |
65957886 | 489 | peer->resettime = peer->uptime = bgp_clock (); |
848973c7 | 490 | |
718e3744 | 491 | #ifdef HAVE_SNMP |
492 | bgpTrapBackwardTransition (peer); | |
493 | #endif /* HAVE_SNMP */ | |
718e3744 | 494 | |
f418446b | 495 | /* Reset peer synctime */ |
496 | peer->synctime = 0; | |
538621f2 | 497 | } |
718e3744 | 498 | |
499 | /* Stop read and write threads when exists. */ | |
500 | BGP_READ_OFF (peer->t_read); | |
501 | BGP_WRITE_OFF (peer->t_write); | |
502 | ||
503 | /* Stop all timers. */ | |
504 | BGP_TIMER_OFF (peer->t_start); | |
505 | BGP_TIMER_OFF (peer->t_connect); | |
506 | BGP_TIMER_OFF (peer->t_holdtime); | |
507 | BGP_TIMER_OFF (peer->t_keepalive); | |
508 | BGP_TIMER_OFF (peer->t_asorig); | |
509 | BGP_TIMER_OFF (peer->t_routeadv); | |
510 | ||
718e3744 | 511 | /* Stream reset. */ |
512 | peer->packet_size = 0; | |
513 | ||
514 | /* Clear input and output buffer. */ | |
515 | if (peer->ibuf) | |
516 | stream_reset (peer->ibuf); | |
517 | if (peer->work) | |
518 | stream_reset (peer->work); | |
200df115 | 519 | if (peer->obuf) |
520 | stream_fifo_clean (peer->obuf); | |
718e3744 | 521 | |
eb821189 | 522 | /* Close of file descriptor. */ |
523 | if (peer->fd >= 0) | |
524 | { | |
525 | close (peer->fd); | |
526 | peer->fd = -1; | |
527 | } | |
718e3744 | 528 | |
718e3744 | 529 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) |
530 | for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++) | |
531 | { | |
538621f2 | 532 | /* Reset all negotiated variables */ |
533 | peer->afc_nego[afi][safi] = 0; | |
534 | peer->afc_adv[afi][safi] = 0; | |
535 | peer->afc_recv[afi][safi] = 0; | |
536 | ||
718e3744 | 537 | /* peer address family capability flags*/ |
538 | peer->af_cap[afi][safi] = 0; | |
538621f2 | 539 | |
718e3744 | 540 | /* peer address family status flags*/ |
541 | peer->af_sflags[afi][safi] = 0; | |
538621f2 | 542 | |
718e3744 | 543 | /* Received ORF prefix-filter */ |
544 | peer->orf_plist[afi][safi] = NULL; | |
538621f2 | 545 | |
718e3744 | 546 | /* ORF received prefix-filter pnt */ |
547 | sprintf (orf_name, "%s.%d.%d", peer->host, afi, safi); | |
548 | prefix_bgp_orf_remove_all (orf_name); | |
549 | } | |
550 | ||
551 | /* Reset keepalive and holdtime */ | |
552 | if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER)) | |
553 | { | |
554 | peer->v_keepalive = peer->keepalive; | |
555 | peer->v_holdtime = peer->holdtime; | |
556 | } | |
557 | else | |
558 | { | |
559 | peer->v_keepalive = peer->bgp->default_keepalive; | |
560 | peer->v_holdtime = peer->bgp->default_holdtime; | |
561 | } | |
562 | ||
563 | peer->update_time = 0; | |
564 | ||
565 | /* Until we are sure that there is no problem about prefix count | |
566 | this should be commented out.*/ | |
567 | #if 0 | |
568 | /* Reset prefix count */ | |
569 | peer->pcount[AFI_IP][SAFI_UNICAST] = 0; | |
570 | peer->pcount[AFI_IP][SAFI_MULTICAST] = 0; | |
571 | peer->pcount[AFI_IP][SAFI_MPLS_VPN] = 0; | |
572 | peer->pcount[AFI_IP6][SAFI_UNICAST] = 0; | |
573 | peer->pcount[AFI_IP6][SAFI_MULTICAST] = 0; | |
574 | #endif /* 0 */ | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
579 | /* BGP peer is stoped by the error. */ | |
94f2b392 | 580 | static int |
718e3744 | 581 | bgp_stop_with_error (struct peer *peer) |
582 | { | |
583 | /* Double start timer. */ | |
584 | peer->v_start *= 2; | |
585 | ||
586 | /* Overflow check. */ | |
587 | if (peer->v_start >= (60 * 2)) | |
588 | peer->v_start = (60 * 2); | |
589 | ||
590 | bgp_stop (peer); | |
591 | ||
592 | return 0; | |
593 | } | |
594 | ||
397b5bde LR |
595 | |
596 | /* something went wrong, send notify and tear down */ | |
597 | static int | |
598 | bgp_stop_with_notify (struct peer *peer, u_char code, u_char sub_code) | |
599 | { | |
600 | /* Send notify to remote peer */ | |
601 | bgp_notify_send (peer, code, sub_code); | |
602 | ||
603 | /* Sweep if it is temporary peer. */ | |
604 | if (CHECK_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER)) | |
605 | { | |
606 | zlog_info ("%s [Event] Accepting BGP peer is deleted", peer->host); | |
607 | peer_delete (peer); | |
608 | return -1; | |
609 | } | |
610 | ||
611 | /* Clear start timer value to default. */ | |
612 | peer->v_start = BGP_INIT_START_TIMER; | |
613 | ||
614 | /* bgp_stop needs to be invoked while in Established state */ | |
615 | bgp_stop(peer); | |
616 | ||
617 | return 0; | |
618 | } | |
619 | ||
620 | ||
718e3744 | 621 | /* TCP connection open. Next we send open message to remote peer. And |
622 | add read thread for reading open message. */ | |
94f2b392 | 623 | static int |
718e3744 | 624 | bgp_connect_success (struct peer *peer) |
625 | { | |
eb821189 | 626 | if (peer->fd < 0) |
718e3744 | 627 | { |
628 | zlog_err ("bgp_connect_success peer's fd is negative value %d", | |
eb821189 | 629 | peer->fd); |
718e3744 | 630 | return -1; |
631 | } | |
eb821189 | 632 | BGP_READ_ON (peer->t_read, bgp_read, peer->fd); |
718e3744 | 633 | |
f418446b | 634 | if (! CHECK_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
635 | bgp_getsockname (peer); | |
636 | ||
637 | if (BGP_DEBUG (normal, NORMAL)) | |
638 | { | |
682ca04c JBD |
639 | char buf1[SU_ADDRSTRLEN]; |
640 | ||
f418446b | 641 | if (! CHECK_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
642 | zlog_debug ("%s open active, local address %s", peer->host, | |
643 | sockunion2str (peer->su_local, buf1, SU_ADDRSTRLEN)); | |
644 | else | |
645 | zlog_debug ("%s passive open", peer->host); | |
646 | } | |
718e3744 | 647 | |
6556d8a0 | 648 | if (! CHECK_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
718e3744 | 649 | bgp_open_send (peer); |
650 | ||
651 | return 0; | |
652 | } | |
653 | ||
654 | /* TCP connect fail */ | |
94f2b392 | 655 | static int |
718e3744 | 656 | bgp_connect_fail (struct peer *peer) |
657 | { | |
658 | bgp_stop (peer); | |
659 | return 0; | |
660 | } | |
661 | ||
662 | /* This function is the first starting point of all BGP connection. It | |
663 | try to connect to remote peer with non-blocking IO. */ | |
664 | int | |
665 | bgp_start (struct peer *peer) | |
666 | { | |
667 | int status; | |
668 | ||
ca058a30 PJ |
669 | if (BGP_PEER_START_SUPPRESSED (peer)) |
670 | { | |
671 | if (BGP_DEBUG (fsm, FSM)) | |
672 | plog_err (peer->log, "%s [FSM] Trying to start suppressed peer" | |
673 | " - this is never supposed to happen!", peer->host); | |
674 | return -1; | |
675 | } | |
676 | ||
33d5ab9e PJ |
677 | /* Scrub some information that might be left over from a previous, |
678 | * session | |
679 | */ | |
680 | /* Connection information. */ | |
681 | if (peer->su_local) | |
682 | { | |
683 | sockunion_free (peer->su_local); | |
684 | peer->su_local = NULL; | |
685 | } | |
686 | ||
687 | if (peer->su_remote) | |
688 | { | |
689 | sockunion_free (peer->su_remote); | |
690 | peer->su_remote = NULL; | |
691 | } | |
692 | ||
693 | /* Clear remote router-id. */ | |
694 | peer->remote_id.s_addr = 0; | |
695 | ||
696 | /* Clear peer capability flag. */ | |
697 | peer->cap = 0; | |
698 | ||
718e3744 | 699 | /* If the peer is passive mode, force to move to Active mode. */ |
700 | if (CHECK_FLAG (peer->flags, PEER_FLAG_PASSIVE)) | |
701 | { | |
702 | BGP_EVENT_ADD (peer, TCP_connection_open_failed); | |
703 | return 0; | |
704 | } | |
705 | ||
706 | status = bgp_connect (peer); | |
707 | ||
708 | switch (status) | |
709 | { | |
710 | case connect_error: | |
711 | if (BGP_DEBUG (fsm, FSM)) | |
8c2e200a | 712 | plog_debug (peer->log, "%s [FSM] Connect error", peer->host); |
718e3744 | 713 | BGP_EVENT_ADD (peer, TCP_connection_open_failed); |
714 | break; | |
715 | case connect_success: | |
716 | if (BGP_DEBUG (fsm, FSM)) | |
8c2e200a | 717 | plog_debug (peer->log, "%s [FSM] Connect immediately success", |
eb821189 | 718 | peer->host); |
718e3744 | 719 | BGP_EVENT_ADD (peer, TCP_connection_open); |
720 | break; | |
721 | case connect_in_progress: | |
722 | /* To check nonblocking connect, we wait until socket is | |
723 | readable or writable. */ | |
724 | if (BGP_DEBUG (fsm, FSM)) | |
8c2e200a | 725 | plog_debug (peer->log, "%s [FSM] Non blocking connect waiting result", |
eb821189 | 726 | peer->host); |
727 | if (peer->fd < 0) | |
718e3744 | 728 | { |
729 | zlog_err ("bgp_start peer's fd is negative value %d", | |
eb821189 | 730 | peer->fd); |
718e3744 | 731 | return -1; |
732 | } | |
eb821189 | 733 | BGP_READ_ON (peer->t_read, bgp_read, peer->fd); |
734 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); | |
718e3744 | 735 | break; |
736 | } | |
737 | return 0; | |
738 | } | |
739 | ||
740 | /* Connect retry timer is expired when the peer status is Connect. */ | |
94f2b392 | 741 | static int |
718e3744 | 742 | bgp_reconnect (struct peer *peer) |
743 | { | |
744 | bgp_stop (peer); | |
745 | bgp_start (peer); | |
746 | return 0; | |
747 | } | |
748 | ||
94f2b392 | 749 | static int |
718e3744 | 750 | bgp_fsm_open (struct peer *peer) |
751 | { | |
752 | /* Send keepalive and make keepalive timer */ | |
753 | bgp_keepalive_send (peer); | |
754 | ||
755 | /* Reset holdtimer value. */ | |
756 | BGP_TIMER_OFF (peer->t_holdtime); | |
757 | ||
758 | return 0; | |
759 | } | |
760 | ||
718e3744 | 761 | /* Keepalive send to peer. */ |
94f2b392 | 762 | static int |
718e3744 | 763 | bgp_fsm_keepalive_expire (struct peer *peer) |
764 | { | |
765 | bgp_keepalive_send (peer); | |
766 | return 0; | |
767 | } | |
768 | ||
397b5bde LR |
769 | /* FSM error, unexpected event. This is error of BGP connection. So cut the |
770 | peer and change to Idle status. */ | |
771 | static int | |
772 | bgp_fsm_event_error (struct peer *peer) | |
773 | { | |
774 | plog_err (peer->log, "%s [FSM] unexpected packet received in state %s", | |
775 | peer->host, LOOKUP (bgp_status_msg, peer->status)); | |
776 | ||
777 | return bgp_stop_with_notify (peer, BGP_NOTIFY_FSM_ERR, 0); | |
778 | } | |
779 | ||
718e3744 | 780 | /* Hold timer expire. This is error of BGP connection. So cut the |
781 | peer and change to Idle status. */ | |
94f2b392 | 782 | static int |
718e3744 | 783 | bgp_fsm_holdtime_expire (struct peer *peer) |
784 | { | |
785 | if (BGP_DEBUG (fsm, FSM)) | |
397b5bde | 786 | plog_debug (peer->log, "%s [FSM] Hold timer expire", peer->host); |
718e3744 | 787 | |
397b5bde | 788 | return bgp_stop_with_notify (peer, BGP_NOTIFY_HOLD_ERR, 0); |
718e3744 | 789 | } |
790 | ||
791 | /* Status goes to Established. Send keepalive packet then make first | |
792 | update information. */ | |
94f2b392 | 793 | static int |
718e3744 | 794 | bgp_establish (struct peer *peer) |
795 | { | |
796 | struct bgp_notify *notify; | |
797 | afi_t afi; | |
798 | safi_t safi; | |
93406d87 | 799 | int nsf_af_count = 0; |
718e3744 | 800 | |
801 | /* Reset capability open status flag. */ | |
802 | if (! CHECK_FLAG (peer->sflags, PEER_STATUS_CAPABILITY_OPEN)) | |
803 | SET_FLAG (peer->sflags, PEER_STATUS_CAPABILITY_OPEN); | |
804 | ||
805 | /* Clear last notification data. */ | |
806 | notify = &peer->notify; | |
807 | if (notify->data) | |
808 | XFREE (MTYPE_TMP, notify->data); | |
809 | memset (notify, 0, sizeof (struct bgp_notify)); | |
810 | ||
811 | /* Clear start timer value to default. */ | |
812 | peer->v_start = BGP_INIT_START_TIMER; | |
813 | ||
814 | /* Increment established count. */ | |
815 | peer->established++; | |
816 | bgp_fsm_change_status (peer, Established); | |
848973c7 | 817 | |
818 | /* bgp log-neighbor-changes of neighbor Up */ | |
819 | if (bgp_flag_check (peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) | |
820 | zlog_info ("%%ADJCHANGE: neighbor %s Up", peer->host); | |
821 | ||
93406d87 | 822 | /* graceful restart */ |
823 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT); | |
824 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
0a28130d | 825 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_3 ; safi++) |
93406d87 | 826 | { |
827 | if (peer->afc_nego[afi][safi] | |
828 | && CHECK_FLAG (peer->cap, PEER_CAP_RESTART_ADV) | |
829 | && CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_RESTART_AF_RCV)) | |
830 | { | |
831 | if (peer->nsf[afi][safi] | |
832 | && ! CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_RESTART_AF_PRESERVE_RCV)) | |
833 | bgp_clear_stale_route (peer, afi, safi); | |
834 | ||
835 | peer->nsf[afi][safi] = 1; | |
836 | nsf_af_count++; | |
837 | } | |
838 | else | |
839 | { | |
840 | if (peer->nsf[afi][safi]) | |
841 | bgp_clear_stale_route (peer, afi, safi); | |
842 | peer->nsf[afi][safi] = 0; | |
843 | } | |
844 | } | |
845 | ||
846 | if (nsf_af_count) | |
847 | SET_FLAG (peer->sflags, PEER_STATUS_NSF_MODE); | |
848 | else | |
849 | { | |
850 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_MODE); | |
851 | if (peer->t_gr_stale) | |
852 | { | |
853 | BGP_TIMER_OFF (peer->t_gr_stale); | |
854 | if (BGP_DEBUG (events, EVENTS)) | |
855 | zlog_debug ("%s graceful restart stalepath timer stopped", peer->host); | |
856 | } | |
857 | } | |
858 | ||
859 | if (peer->t_gr_restart) | |
860 | { | |
861 | BGP_TIMER_OFF (peer->t_gr_restart); | |
862 | if (BGP_DEBUG (events, EVENTS)) | |
863 | zlog_debug ("%s graceful restart timer stopped", peer->host); | |
864 | } | |
865 | ||
718e3744 | 866 | #ifdef HAVE_SNMP |
867 | bgpTrapEstablished (peer); | |
868 | #endif /* HAVE_SNMP */ | |
869 | ||
870 | /* Reset uptime, send keepalive, send current table. */ | |
65957886 | 871 | peer->uptime = bgp_clock (); |
718e3744 | 872 | |
873 | /* Send route-refresh when ORF is enabled */ | |
874 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
875 | for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++) | |
876 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_SM_ADV)) | |
877 | { | |
878 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_RM_RCV)) | |
879 | bgp_route_refresh_send (peer, afi, safi, ORF_TYPE_PREFIX, | |
880 | REFRESH_IMMEDIATE, 0); | |
881 | else if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_RM_OLD_RCV)) | |
882 | bgp_route_refresh_send (peer, afi, safi, ORF_TYPE_PREFIX_OLD, | |
883 | REFRESH_IMMEDIATE, 0); | |
884 | } | |
885 | ||
886 | if (peer->v_keepalive) | |
887 | bgp_keepalive_send (peer); | |
888 | ||
889 | /* First update is deferred until ORF or ROUTE-REFRESH is received */ | |
890 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
891 | for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++) | |
892 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_RM_ADV)) | |
893 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_SM_RCV) | |
894 | || CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_SM_OLD_RCV)) | |
895 | SET_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_ORF_WAIT_REFRESH); | |
896 | ||
897 | bgp_announce_route_all (peer); | |
898 | ||
899 | BGP_TIMER_ON (peer->t_routeadv, bgp_routeadv_timer, 1); | |
900 | ||
901 | return 0; | |
902 | } | |
903 | ||
904 | /* Keepalive packet is received. */ | |
94f2b392 | 905 | static int |
718e3744 | 906 | bgp_fsm_keepalive (struct peer *peer) |
907 | { | |
908 | /* peer count update */ | |
909 | peer->keepalive_in++; | |
910 | ||
911 | BGP_TIMER_OFF (peer->t_holdtime); | |
912 | return 0; | |
913 | } | |
914 | ||
915 | /* Update packet is received. */ | |
94f2b392 | 916 | static int |
718e3744 | 917 | bgp_fsm_update (struct peer *peer) |
918 | { | |
919 | BGP_TIMER_OFF (peer->t_holdtime); | |
920 | return 0; | |
921 | } | |
922 | ||
923 | /* This is empty event. */ | |
94f2b392 | 924 | static int |
718e3744 | 925 | bgp_ignore (struct peer *peer) |
926 | { | |
927 | if (BGP_DEBUG (fsm, FSM)) | |
928 | zlog (peer->log, LOG_DEBUG, "%s [FSM] bgp_ignore called", peer->host); | |
929 | return 0; | |
930 | } | |
6b0655a2 | 931 | |
718e3744 | 932 | /* Finite State Machine structure */ |
fda1d3e0 | 933 | static const struct { |
66e5cd87 | 934 | int (*func) (struct peer *); |
718e3744 | 935 | int next_state; |
936 | } FSM [BGP_STATUS_MAX - 1][BGP_EVENTS_MAX - 1] = | |
937 | { | |
938 | { | |
939 | /* Idle state: In Idle state, all events other than BGP_Start is | |
940 | ignored. With BGP_Start event, finite state machine calls | |
941 | bgp_start(). */ | |
942 | {bgp_start, Connect}, /* BGP_Start */ | |
943 | {bgp_stop, Idle}, /* BGP_Stop */ | |
944 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
945 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
946 | {bgp_ignore, Idle}, /* TCP_connection_open_failed */ | |
947 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
948 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ | |
949 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
950 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
951 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
952 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
953 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
954 | {bgp_ignore, Idle}, /* Receive_NOTIFICATION_message */ | |
ca058a30 | 955 | {bgp_ignore, Idle}, /* Clearing_Completed */ |
718e3744 | 956 | }, |
957 | { | |
958 | /* Connect */ | |
959 | {bgp_ignore, Connect}, /* BGP_Start */ | |
960 | {bgp_stop, Idle}, /* BGP_Stop */ | |
961 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
962 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
963 | {bgp_connect_fail, Active}, /* TCP_connection_open_failed */ | |
964 | {bgp_connect_fail, Idle}, /* TCP_fatal_error */ | |
965 | {bgp_reconnect, Connect}, /* ConnectRetry_timer_expired */ | |
966 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
967 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
968 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
969 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
970 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
971 | {bgp_stop, Idle}, /* Receive_NOTIFICATION_message */ | |
ca058a30 | 972 | {bgp_ignore, Idle}, /* Clearing_Completed */ |
718e3744 | 973 | }, |
974 | { | |
975 | /* Active, */ | |
976 | {bgp_ignore, Active}, /* BGP_Start */ | |
977 | {bgp_stop, Idle}, /* BGP_Stop */ | |
978 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
979 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
980 | {bgp_ignore, Active}, /* TCP_connection_open_failed */ | |
981 | {bgp_ignore, Idle}, /* TCP_fatal_error */ | |
982 | {bgp_start, Connect}, /* ConnectRetry_timer_expired */ | |
983 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
984 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
985 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
986 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
987 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
988 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
ca058a30 | 989 | {bgp_ignore, Idle}, /* Clearing_Completed */ |
718e3744 | 990 | }, |
991 | { | |
992 | /* OpenSent, */ | |
993 | {bgp_ignore, OpenSent}, /* BGP_Start */ | |
994 | {bgp_stop, Idle}, /* BGP_Stop */ | |
536792cd | 995 | {bgp_stop, Active}, /* TCP_connection_open */ |
718e3744 | 996 | {bgp_stop, Active}, /* TCP_connection_closed */ |
536792cd PJ |
997 | {bgp_stop, Active}, /* TCP_connection_open_failed */ |
998 | {bgp_stop, Active}, /* TCP_fatal_error */ | |
718e3744 | 999 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ |
1000 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
1001 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
1002 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ | |
397b5bde LR |
1003 | {bgp_fsm_event_error, Idle}, /* Receive_KEEPALIVE_message */ |
1004 | {bgp_fsm_event_error, Idle}, /* Receive_UPDATE_message */ | |
718e3744 | 1005 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ |
ca058a30 | 1006 | {bgp_ignore, Idle}, /* Clearing_Completed */ |
718e3744 | 1007 | }, |
1008 | { | |
1009 | /* OpenConfirm, */ | |
1010 | {bgp_ignore, OpenConfirm}, /* BGP_Start */ | |
1011 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1012 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1013 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1014 | {bgp_stop, Idle}, /* TCP_connection_open_failed */ | |
1015 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1016 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ | |
1017 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
1018 | {bgp_ignore, OpenConfirm}, /* KeepAlive_timer_expired */ | |
1019 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
1020 | {bgp_establish, Established}, /* Receive_KEEPALIVE_message */ | |
1021 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
1022 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
ca058a30 | 1023 | {bgp_ignore, Idle}, /* Clearing_Completed */ |
718e3744 | 1024 | }, |
1025 | { | |
1026 | /* Established, */ | |
ca058a30 PJ |
1027 | {bgp_ignore, Established}, /* BGP_Start */ |
1028 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
1029 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1030 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
3117b5c4 | 1031 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ |
ca058a30 | 1032 | {bgp_stop, Clearing}, /* TCP_fatal_error */ |
3117b5c4 | 1033 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ |
ca058a30 | 1034 | {bgp_fsm_holdtime_expire, Clearing}, /* Hold_Timer_expired */ |
718e3744 | 1035 | {bgp_fsm_keepalive_expire, Established}, /* KeepAlive_timer_expired */ |
ca058a30 PJ |
1036 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ |
1037 | {bgp_fsm_keepalive, Established}, /* Receive_KEEPALIVE_message */ | |
1038 | {bgp_fsm_update, Established}, /* Receive_UPDATE_message */ | |
1039 | {bgp_stop_with_error, Clearing}, /* Receive_NOTIFICATION_message */ | |
1040 | {bgp_ignore, Idle}, /* Clearing_Completed */ | |
1041 | }, | |
1042 | { | |
1043 | /* Clearing, */ | |
1044 | {bgp_ignore, Clearing}, /* BGP_Start */ | |
3117b5c4 SH |
1045 | {bgp_stop, Clearing}, /* BGP_Stop */ |
1046 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1047 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
1048 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
1049 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
1050 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
1051 | {bgp_stop, Clearing}, /* Hold_Timer_expired */ | |
1052 | {bgp_stop, Clearing}, /* KeepAlive_timer_expired */ | |
1053 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
1054 | {bgp_stop, Clearing}, /* Receive_KEEPALIVE_message */ | |
1055 | {bgp_stop, Clearing}, /* Receive_UPDATE_message */ | |
1056 | {bgp_stop, Clearing}, /* Receive_NOTIFICATION_message */ | |
1057 | {bgp_clearing_completed, Idle}, /* Clearing_Completed */ | |
ca058a30 PJ |
1058 | }, |
1059 | { | |
1060 | /* Deleted, */ | |
1061 | {bgp_ignore, Deleted}, /* BGP_Start */ | |
1062 | {bgp_ignore, Deleted}, /* BGP_Stop */ | |
1063 | {bgp_ignore, Deleted}, /* TCP_connection_open */ | |
1064 | {bgp_ignore, Deleted}, /* TCP_connection_closed */ | |
1065 | {bgp_ignore, Deleted}, /* TCP_connection_open_failed */ | |
1066 | {bgp_ignore, Deleted}, /* TCP_fatal_error */ | |
1067 | {bgp_ignore, Deleted}, /* ConnectRetry_timer_expired */ | |
1068 | {bgp_ignore, Deleted}, /* Hold_Timer_expired */ | |
1069 | {bgp_ignore, Deleted}, /* KeepAlive_timer_expired */ | |
1070 | {bgp_ignore, Deleted}, /* Receive_OPEN_message */ | |
1071 | {bgp_ignore, Deleted}, /* Receive_KEEPALIVE_message */ | |
1072 | {bgp_ignore, Deleted}, /* Receive_UPDATE_message */ | |
1073 | {bgp_ignore, Deleted}, /* Receive_NOTIFICATION_message */ | |
1074 | {bgp_ignore, Deleted}, /* Clearing_Completed */ | |
718e3744 | 1075 | }, |
1076 | }; | |
1077 | ||
fd79ac91 | 1078 | static const char *bgp_event_str[] = |
718e3744 | 1079 | { |
1080 | NULL, | |
1081 | "BGP_Start", | |
1082 | "BGP_Stop", | |
1083 | "TCP_connection_open", | |
1084 | "TCP_connection_closed", | |
1085 | "TCP_connection_open_failed", | |
1086 | "TCP_fatal_error", | |
1087 | "ConnectRetry_timer_expired", | |
1088 | "Hold_Timer_expired", | |
1089 | "KeepAlive_timer_expired", | |
1090 | "Receive_OPEN_message", | |
1091 | "Receive_KEEPALIVE_message", | |
1092 | "Receive_UPDATE_message", | |
ca058a30 PJ |
1093 | "Receive_NOTIFICATION_message", |
1094 | "Clearing_Completed", | |
718e3744 | 1095 | }; |
1096 | ||
1097 | /* Execute event process. */ | |
1098 | int | |
1099 | bgp_event (struct thread *thread) | |
1100 | { | |
ca058a30 | 1101 | int ret = 0; |
718e3744 | 1102 | int event; |
1103 | int next; | |
1104 | struct peer *peer; | |
1105 | ||
1106 | peer = THREAD_ARG (thread); | |
1107 | event = THREAD_VAL (thread); | |
1108 | ||
1109 | /* Logging this event. */ | |
1110 | next = FSM [peer->status -1][event - 1].next_state; | |
1111 | ||
ca058a30 | 1112 | if (BGP_DEBUG (fsm, FSM) && peer->status != next) |
8c2e200a | 1113 | plog_debug (peer->log, "%s [FSM] %s (%s->%s)", peer->host, |
718e3744 | 1114 | bgp_event_str[event], |
1115 | LOOKUP (bgp_status_msg, peer->status), | |
1116 | LOOKUP (bgp_status_msg, next)); | |
718e3744 | 1117 | |
1118 | /* Call function. */ | |
ca058a30 PJ |
1119 | if (FSM [peer->status -1][event - 1].func) |
1120 | ret = (*(FSM [peer->status - 1][event - 1].func))(peer); | |
718e3744 | 1121 | |
1122 | /* When function do not want proceed next job return -1. */ | |
200df115 | 1123 | if (ret >= 0) |
1124 | { | |
1125 | /* If status is changed. */ | |
1126 | if (next != peer->status) | |
f2c31acb | 1127 | bgp_fsm_change_status (peer, next); |
95fdcd8a | 1128 | |
200df115 | 1129 | /* Make sure timer is set. */ |
1130 | bgp_timer_set (peer); | |
1131 | } | |
1132 | ||
200df115 | 1133 | return ret; |
718e3744 | 1134 | } |