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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" | |
f188f2c4 | 33 | #include "workqueue.h" |
718e3744 | 34 | |
35 | #include "bgpd/bgpd.h" | |
36 | #include "bgpd/bgp_attr.h" | |
37 | #include "bgpd/bgp_debug.h" | |
38 | #include "bgpd/bgp_fsm.h" | |
39 | #include "bgpd/bgp_packet.h" | |
40 | #include "bgpd/bgp_network.h" | |
41 | #include "bgpd/bgp_route.h" | |
42 | #include "bgpd/bgp_dump.h" | |
43 | #include "bgpd/bgp_open.h" | |
f188f2c4 | 44 | #include "bgpd/bgp_advertise.h" |
718e3744 | 45 | #ifdef HAVE_SNMP |
46 | #include "bgpd/bgp_snmp.h" | |
47 | #endif /* HAVE_SNMP */ | |
6b0655a2 | 48 | |
718e3744 | 49 | /* BGP FSM (finite state machine) has three types of functions. Type |
50 | one is thread functions. Type two is event functions. Type three | |
51 | is FSM functions. Timer functions are set by bgp_timer_set | |
52 | function. */ | |
53 | ||
54 | /* BGP event function. */ | |
55 | int bgp_event (struct thread *); | |
56 | ||
57 | /* BGP thread functions. */ | |
58 | static int bgp_start_timer (struct thread *); | |
59 | static int bgp_connect_timer (struct thread *); | |
60 | static int bgp_holdtime_timer (struct thread *); | |
61 | static int bgp_keepalive_timer (struct thread *); | |
62 | ||
63 | /* BGP FSM functions. */ | |
64 | static int bgp_start (struct peer *); | |
65 | ||
66 | /* BGP start timer jitter. */ | |
94f2b392 | 67 | static int |
718e3744 | 68 | bgp_start_jitter (int time) |
69 | { | |
70 | return ((rand () % (time + 1)) - (time / 2)); | |
71 | } | |
72 | ||
1ff9a340 DS |
73 | static void |
74 | peer_xfer_stats (struct peer *peer_dst, struct peer *peer_src) | |
75 | { | |
76 | /* Copy stats over. These are only the pre-established state stats */ | |
77 | peer_dst->open_in += peer_src->open_in; | |
78 | peer_dst->open_out += peer_src->open_out; | |
79 | peer_dst->keepalive_in += peer_src->keepalive_in; | |
80 | peer_dst->keepalive_out += peer_src->keepalive_out; | |
81 | peer_dst->notify_in += peer_src->notify_in; | |
82 | peer_dst->notify_out += peer_src->notify_out; | |
83 | peer_dst->dynamic_cap_in += peer_src->dynamic_cap_in; | |
84 | peer_dst->dynamic_cap_out += peer_src->dynamic_cap_out; | |
85 | } | |
86 | ||
87 | static struct peer * | |
88 | peer_xfer_conn(struct peer *from_peer) | |
89 | { | |
90 | struct peer *peer; | |
91 | afi_t afi; | |
92 | safi_t safi; | |
93 | int fd; | |
94 | int status, pstatus; | |
95 | ||
96 | assert(from_peer != NULL); | |
97 | ||
98 | peer = from_peer->doppelganger; | |
99 | ||
100 | if (!peer || !CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE)) | |
101 | return from_peer; | |
102 | ||
103 | BGP_WRITE_OFF(peer->t_write); | |
104 | BGP_READ_OFF(peer->t_read); | |
105 | BGP_WRITE_OFF(from_peer->t_write); | |
106 | BGP_READ_OFF(from_peer->t_read); | |
107 | ||
108 | fd = peer->fd; | |
109 | peer->fd = from_peer->fd; | |
110 | from_peer->fd = fd; | |
111 | stream_reset(peer->ibuf); | |
112 | stream_fifo_clean(peer->obuf); | |
113 | stream_fifo_clean(from_peer->obuf); | |
114 | ||
115 | peer->v_holdtime = from_peer->v_holdtime; | |
116 | peer->v_keepalive = from_peer->v_keepalive; | |
117 | peer->v_asorig = from_peer->v_asorig; | |
118 | peer->routeadv = from_peer->routeadv; | |
119 | peer->v_routeadv = from_peer->v_routeadv; | |
120 | peer->v_gr_restart = from_peer->v_gr_restart; | |
121 | peer->cap = from_peer->cap; | |
122 | status = peer->status; | |
123 | pstatus = peer->ostatus; | |
124 | peer->status = from_peer->status; | |
125 | peer->ostatus = from_peer->ostatus; | |
126 | from_peer->status = status; | |
127 | from_peer->ostatus = pstatus; | |
128 | peer->remote_id = from_peer->remote_id; | |
129 | ||
130 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
131 | for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++) | |
132 | { | |
133 | peer->af_flags[afi][safi] = from_peer->af_flags[afi][safi]; | |
134 | peer->af_sflags[afi][safi] = from_peer->af_sflags[afi][safi]; | |
135 | peer->af_cap[afi][safi] = from_peer->af_cap[afi][safi]; | |
136 | peer->afc_nego[afi][safi] = from_peer->afc_nego[afi][safi]; | |
137 | peer->afc_adv[afi][safi] = from_peer->afc_adv[afi][safi]; | |
138 | peer->afc_recv[afi][safi] = from_peer->afc_recv[afi][safi]; | |
139 | } | |
140 | ||
141 | if (bgp_getsockname(peer) < 0) | |
142 | { | |
143 | zlog_err ("%%bgp_getsockname() failed for %s peer %s fd %d (from_peer fd %d)", | |
144 | (CHECK_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER) ? "accept" : ""), | |
145 | peer->host, peer->fd, from_peer->fd); | |
146 | bgp_stop(peer); | |
147 | bgp_stop(from_peer); | |
148 | return NULL; | |
149 | } | |
150 | if (from_peer->status > Active) | |
151 | { | |
152 | if (bgp_getsockname(from_peer) < 0) | |
153 | { | |
154 | zlog_err ("%%bgp_getsockname() failed for %s from_peer %s fd %d (peer fd %d)", | |
155 | (CHECK_FLAG (from_peer->sflags, PEER_STATUS_ACCEPT_PEER) ? "accept" : ""), | |
156 | from_peer->host, from_peer->fd, peer->fd); | |
157 | bgp_stop(from_peer); | |
158 | from_peer = NULL; | |
159 | } | |
160 | } | |
161 | ||
162 | BGP_READ_ON(peer->t_read, bgp_read, peer->fd); | |
163 | BGP_WRITE_ON(peer->t_write, bgp_write, peer->fd); | |
164 | ||
165 | if (from_peer) | |
166 | peer_xfer_stats(peer, from_peer); | |
167 | ||
168 | return(peer); | |
169 | } | |
170 | ||
ca058a30 PJ |
171 | /* Check if suppress start/restart of sessions to peer. */ |
172 | #define BGP_PEER_START_SUPPRESSED(P) \ | |
173 | (CHECK_FLAG ((P)->flags, PEER_FLAG_SHUTDOWN) \ | |
174 | || CHECK_FLAG ((P)->sflags, PEER_STATUS_PREFIX_OVERFLOW)) | |
175 | ||
718e3744 | 176 | /* Hook function called after bgp event is occered. And vty's |
177 | neighbor command invoke this function after making neighbor | |
178 | structure. */ | |
179 | void | |
180 | bgp_timer_set (struct peer *peer) | |
181 | { | |
182 | int jitter = 0; | |
183 | ||
184 | switch (peer->status) | |
185 | { | |
186 | case Idle: | |
187 | /* First entry point of peer's finite state machine. In Idle | |
188 | status start timer is on unless peer is shutdown or peer is | |
189 | inactive. All other timer must be turned off */ | |
ca058a30 | 190 | if (BGP_PEER_START_SUPPRESSED (peer) || ! peer_active (peer)) |
718e3744 | 191 | { |
192 | BGP_TIMER_OFF (peer->t_start); | |
193 | } | |
194 | else | |
195 | { | |
196 | jitter = bgp_start_jitter (peer->v_start); | |
197 | BGP_TIMER_ON (peer->t_start, bgp_start_timer, | |
198 | peer->v_start + jitter); | |
199 | } | |
200 | BGP_TIMER_OFF (peer->t_connect); | |
201 | BGP_TIMER_OFF (peer->t_holdtime); | |
202 | BGP_TIMER_OFF (peer->t_keepalive); | |
203 | BGP_TIMER_OFF (peer->t_asorig); | |
204 | BGP_TIMER_OFF (peer->t_routeadv); | |
205 | break; | |
206 | ||
207 | case Connect: | |
208 | /* After start timer is expired, the peer moves to Connnect | |
209 | status. Make sure start timer is off and connect timer is | |
210 | on. */ | |
211 | BGP_TIMER_OFF (peer->t_start); | |
212 | BGP_TIMER_ON (peer->t_connect, bgp_connect_timer, peer->v_connect); | |
213 | BGP_TIMER_OFF (peer->t_holdtime); | |
214 | BGP_TIMER_OFF (peer->t_keepalive); | |
215 | BGP_TIMER_OFF (peer->t_asorig); | |
216 | BGP_TIMER_OFF (peer->t_routeadv); | |
217 | break; | |
218 | ||
219 | case Active: | |
220 | /* Active is waiting connection from remote peer. And if | |
221 | connect timer is expired, change status to Connect. */ | |
222 | BGP_TIMER_OFF (peer->t_start); | |
223 | /* If peer is passive mode, do not set connect timer. */ | |
93406d87 | 224 | if (CHECK_FLAG (peer->flags, PEER_FLAG_PASSIVE) |
225 | || CHECK_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT)) | |
718e3744 | 226 | { |
227 | BGP_TIMER_OFF (peer->t_connect); | |
228 | } | |
229 | else | |
230 | { | |
231 | BGP_TIMER_ON (peer->t_connect, bgp_connect_timer, peer->v_connect); | |
232 | } | |
233 | BGP_TIMER_OFF (peer->t_holdtime); | |
234 | BGP_TIMER_OFF (peer->t_keepalive); | |
235 | BGP_TIMER_OFF (peer->t_asorig); | |
236 | BGP_TIMER_OFF (peer->t_routeadv); | |
237 | break; | |
238 | ||
239 | case OpenSent: | |
240 | /* OpenSent status. */ | |
241 | BGP_TIMER_OFF (peer->t_start); | |
242 | BGP_TIMER_OFF (peer->t_connect); | |
243 | if (peer->v_holdtime != 0) | |
244 | { | |
245 | BGP_TIMER_ON (peer->t_holdtime, bgp_holdtime_timer, | |
246 | peer->v_holdtime); | |
247 | } | |
248 | else | |
249 | { | |
250 | BGP_TIMER_OFF (peer->t_holdtime); | |
251 | } | |
252 | BGP_TIMER_OFF (peer->t_keepalive); | |
253 | BGP_TIMER_OFF (peer->t_asorig); | |
254 | BGP_TIMER_OFF (peer->t_routeadv); | |
255 | break; | |
256 | ||
257 | case OpenConfirm: | |
258 | /* OpenConfirm status. */ | |
259 | BGP_TIMER_OFF (peer->t_start); | |
260 | BGP_TIMER_OFF (peer->t_connect); | |
261 | ||
262 | /* If the negotiated Hold Time value is zero, then the Hold Time | |
263 | timer and KeepAlive timers are not started. */ | |
264 | if (peer->v_holdtime == 0) | |
265 | { | |
266 | BGP_TIMER_OFF (peer->t_holdtime); | |
267 | BGP_TIMER_OFF (peer->t_keepalive); | |
268 | } | |
269 | else | |
270 | { | |
271 | BGP_TIMER_ON (peer->t_holdtime, bgp_holdtime_timer, | |
272 | peer->v_holdtime); | |
273 | BGP_TIMER_ON (peer->t_keepalive, bgp_keepalive_timer, | |
274 | peer->v_keepalive); | |
275 | } | |
276 | BGP_TIMER_OFF (peer->t_asorig); | |
277 | BGP_TIMER_OFF (peer->t_routeadv); | |
278 | break; | |
279 | ||
280 | case Established: | |
281 | /* In Established status start and connect timer is turned | |
282 | off. */ | |
283 | BGP_TIMER_OFF (peer->t_start); | |
284 | BGP_TIMER_OFF (peer->t_connect); | |
285 | ||
286 | /* Same as OpenConfirm, if holdtime is zero then both holdtime | |
287 | and keepalive must be turned off. */ | |
288 | if (peer->v_holdtime == 0) | |
289 | { | |
290 | BGP_TIMER_OFF (peer->t_holdtime); | |
291 | BGP_TIMER_OFF (peer->t_keepalive); | |
292 | } | |
293 | else | |
294 | { | |
295 | BGP_TIMER_ON (peer->t_holdtime, bgp_holdtime_timer, | |
296 | peer->v_holdtime); | |
297 | BGP_TIMER_ON (peer->t_keepalive, bgp_keepalive_timer, | |
298 | peer->v_keepalive); | |
299 | } | |
300 | BGP_TIMER_OFF (peer->t_asorig); | |
301 | break; | |
ca058a30 PJ |
302 | case Deleted: |
303 | BGP_TIMER_OFF (peer->t_gr_restart); | |
304 | BGP_TIMER_OFF (peer->t_gr_stale); | |
305 | BGP_TIMER_OFF (peer->t_pmax_restart); | |
306 | case Clearing: | |
307 | BGP_TIMER_OFF (peer->t_start); | |
308 | BGP_TIMER_OFF (peer->t_connect); | |
309 | BGP_TIMER_OFF (peer->t_holdtime); | |
310 | BGP_TIMER_OFF (peer->t_keepalive); | |
311 | BGP_TIMER_OFF (peer->t_asorig); | |
312 | BGP_TIMER_OFF (peer->t_routeadv); | |
1ff9a340 | 313 | break; |
718e3744 | 314 | } |
315 | } | |
316 | ||
317 | /* BGP start timer. This function set BGP_Start event to thread value | |
318 | and process event. */ | |
319 | static int | |
320 | bgp_start_timer (struct thread *thread) | |
321 | { | |
322 | struct peer *peer; | |
323 | ||
324 | peer = THREAD_ARG (thread); | |
325 | peer->t_start = NULL; | |
326 | ||
327 | if (BGP_DEBUG (fsm, FSM)) | |
328 | zlog (peer->log, LOG_DEBUG, | |
329 | "%s [FSM] Timer (start timer expire).", peer->host); | |
330 | ||
331 | THREAD_VAL (thread) = BGP_Start; | |
200df115 | 332 | bgp_event (thread); /* bgp_event unlocks peer */ |
718e3744 | 333 | |
334 | return 0; | |
335 | } | |
336 | ||
337 | /* BGP connect retry timer. */ | |
338 | static int | |
339 | bgp_connect_timer (struct thread *thread) | |
340 | { | |
341 | struct peer *peer; | |
1ff9a340 | 342 | int ret; |
718e3744 | 343 | |
344 | peer = THREAD_ARG (thread); | |
345 | peer->t_connect = NULL; | |
346 | ||
347 | if (BGP_DEBUG (fsm, FSM)) | |
348 | zlog (peer->log, LOG_DEBUG, "%s [FSM] Timer (connect timer expire)", | |
349 | peer->host); | |
350 | ||
1ff9a340 DS |
351 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
352 | { | |
353 | bgp_stop(peer); | |
354 | ret = -1; | |
355 | } | |
356 | else | |
357 | { | |
358 | THREAD_VAL (thread) = ConnectRetry_timer_expired; | |
359 | bgp_event (thread); /* bgp_event unlocks peer */ | |
360 | ret = 0; | |
361 | } | |
718e3744 | 362 | |
1ff9a340 | 363 | return ret; |
718e3744 | 364 | } |
365 | ||
366 | /* BGP holdtime timer. */ | |
367 | static int | |
368 | bgp_holdtime_timer (struct thread *thread) | |
369 | { | |
370 | struct peer *peer; | |
371 | ||
372 | peer = THREAD_ARG (thread); | |
373 | peer->t_holdtime = NULL; | |
374 | ||
375 | if (BGP_DEBUG (fsm, FSM)) | |
376 | zlog (peer->log, LOG_DEBUG, | |
377 | "%s [FSM] Timer (holdtime timer expire)", | |
378 | peer->host); | |
379 | ||
380 | THREAD_VAL (thread) = Hold_Timer_expired; | |
200df115 | 381 | bgp_event (thread); /* bgp_event unlocks peer */ |
718e3744 | 382 | |
383 | return 0; | |
384 | } | |
385 | ||
386 | /* BGP keepalive fire ! */ | |
387 | static int | |
388 | bgp_keepalive_timer (struct thread *thread) | |
389 | { | |
390 | struct peer *peer; | |
391 | ||
392 | peer = THREAD_ARG (thread); | |
393 | peer->t_keepalive = NULL; | |
394 | ||
395 | if (BGP_DEBUG (fsm, FSM)) | |
396 | zlog (peer->log, LOG_DEBUG, | |
397 | "%s [FSM] Timer (keepalive timer expire)", | |
398 | peer->host); | |
399 | ||
400 | THREAD_VAL (thread) = KeepAlive_timer_expired; | |
200df115 | 401 | bgp_event (thread); /* bgp_event unlocks peer */ |
718e3744 | 402 | |
403 | return 0; | |
404 | } | |
405 | ||
cb1faec9 DS |
406 | static int |
407 | bgp_routeq_empty (struct peer *peer) | |
408 | { | |
409 | afi_t afi; | |
410 | safi_t safi; | |
411 | ||
412 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
413 | for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++) | |
414 | { | |
415 | if (!FIFO_EMPTY(&peer->sync[afi][safi]->withdraw) || | |
416 | !FIFO_EMPTY(&peer->sync[afi][safi]->update)) | |
417 | return 0; | |
418 | } | |
419 | return 1; | |
420 | } | |
421 | ||
94f2b392 | 422 | static int |
718e3744 | 423 | bgp_routeadv_timer (struct thread *thread) |
424 | { | |
425 | struct peer *peer; | |
426 | ||
427 | peer = THREAD_ARG (thread); | |
428 | peer->t_routeadv = NULL; | |
429 | ||
430 | if (BGP_DEBUG (fsm, FSM)) | |
431 | zlog (peer->log, LOG_DEBUG, | |
432 | "%s [FSM] Timer (routeadv timer expire)", | |
433 | peer->host); | |
434 | ||
65957886 | 435 | peer->synctime = bgp_clock (); |
718e3744 | 436 | |
eb821189 | 437 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
718e3744 | 438 | |
cb1faec9 DS |
439 | /* |
440 | * If there is no UPDATE to send, don't start the timer. We will start | |
441 | * it when the queues go non-empty. | |
442 | */ | |
443 | if (bgp_routeq_empty(peer)) | |
444 | return 0; | |
445 | ||
446 | BGP_TIMER_ON (peer->t_routeadv, bgp_routeadv_timer, peer->v_routeadv); | |
718e3744 | 447 | |
448 | return 0; | |
449 | } | |
450 | ||
e0701b79 | 451 | /* BGP Peer Down Cause */ |
fd79ac91 | 452 | const char *peer_down_str[] = |
e0701b79 | 453 | { |
454 | "", | |
455 | "Router ID changed", | |
456 | "Remote AS changed", | |
457 | "Local AS change", | |
458 | "Cluster ID changed", | |
459 | "Confederation identifier changed", | |
460 | "Confederation peer changed", | |
461 | "RR client config change", | |
462 | "RS client config change", | |
463 | "Update source change", | |
464 | "Address family activated", | |
465 | "Admin. shutdown", | |
466 | "User reset", | |
467 | "BGP Notification received", | |
468 | "BGP Notification send", | |
469 | "Peer closed the session", | |
470 | "Neighbor deleted", | |
471 | "Peer-group add member", | |
472 | "Peer-group delete member", | |
473 | "Capability changed", | |
474 | "Passive config change", | |
93406d87 | 475 | "Multihop config change", |
476 | "NSF peer closed the session" | |
e0701b79 | 477 | }; |
478 | ||
94f2b392 | 479 | static int |
93406d87 | 480 | bgp_graceful_restart_timer_expire (struct thread *thread) |
481 | { | |
482 | struct peer *peer; | |
483 | afi_t afi; | |
484 | safi_t safi; | |
485 | ||
486 | peer = THREAD_ARG (thread); | |
487 | peer->t_gr_restart = NULL; | |
488 | ||
489 | /* NSF delete stale route */ | |
490 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
0a28130d | 491 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_3 ; safi++) |
93406d87 | 492 | if (peer->nsf[afi][safi]) |
493 | bgp_clear_stale_route (peer, afi, safi); | |
494 | ||
495 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT); | |
496 | BGP_TIMER_OFF (peer->t_gr_stale); | |
497 | ||
498 | if (BGP_DEBUG (events, EVENTS)) | |
499 | { | |
500 | zlog_debug ("%s graceful restart timer expired", peer->host); | |
501 | zlog_debug ("%s graceful restart stalepath timer stopped", peer->host); | |
502 | } | |
503 | ||
504 | bgp_timer_set (peer); | |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
94f2b392 | 509 | static int |
93406d87 | 510 | bgp_graceful_stale_timer_expire (struct thread *thread) |
511 | { | |
512 | struct peer *peer; | |
513 | afi_t afi; | |
514 | safi_t safi; | |
515 | ||
516 | peer = THREAD_ARG (thread); | |
517 | peer->t_gr_stale = NULL; | |
518 | ||
519 | if (BGP_DEBUG (events, EVENTS)) | |
520 | zlog_debug ("%s graceful restart stalepath timer expired", peer->host); | |
521 | ||
522 | /* NSF delete stale route */ | |
523 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
0a28130d | 524 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_3 ; safi++) |
93406d87 | 525 | if (peer->nsf[afi][safi]) |
526 | bgp_clear_stale_route (peer, afi, safi); | |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
f188f2c4 DS |
531 | static int |
532 | bgp_update_delay_applicable (struct bgp *bgp) | |
533 | { | |
534 | /* update_delay_over flag should be reset (set to 0) for any new | |
535 | applicability of the update-delay during BGP process lifetime. | |
536 | And it should be set after an occurence of the update-delay is over)*/ | |
537 | if (!bgp->update_delay_over) | |
538 | return 1; | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | int | |
544 | bgp_update_delay_active (struct bgp *bgp) | |
545 | { | |
546 | if (bgp->t_update_delay) | |
547 | return 1; | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
552 | int | |
553 | bgp_update_delay_configured (struct bgp *bgp) | |
554 | { | |
555 | if (bgp->v_update_delay) | |
556 | return 1; | |
557 | ||
558 | return 0; | |
559 | } | |
560 | ||
561 | /* Do the post-processing needed when bgp comes out of the read-only mode | |
562 | on ending the update delay. */ | |
563 | void | |
564 | bgp_update_delay_end (struct bgp *bgp) | |
565 | { | |
566 | struct listnode *node, *nnode; | |
567 | struct peer *peer; | |
568 | ||
569 | THREAD_TIMER_OFF (bgp->t_update_delay); | |
570 | THREAD_TIMER_OFF (bgp->t_establish_wait); | |
571 | ||
572 | /* Reset update-delay related state */ | |
573 | bgp->update_delay_over = 1; | |
574 | bgp->established = 0; | |
575 | bgp->restarted_peers = 0; | |
576 | bgp->implicit_eors = 0; | |
577 | bgp->explicit_eors = 0; | |
578 | ||
579 | quagga_timestamp(3, bgp->update_delay_end_time, | |
580 | sizeof(bgp->update_delay_end_time)); | |
581 | ||
cb1faec9 DS |
582 | /* |
583 | * Add an end-of-initial-update marker to the main process queues so that | |
584 | * the route advertisement timer for the peers can be started. | |
585 | */ | |
586 | bgp_add_eoiu_mark(bgp, BGP_TABLE_MAIN); | |
587 | bgp_add_eoiu_mark(bgp, BGP_TABLE_RSCLIENT); | |
588 | ||
f188f2c4 DS |
589 | /* Route announcements were postponed for all the peers during read-only mode, |
590 | send those now. */ | |
591 | for (ALL_LIST_ELEMENTS (bgp->peer, node, nnode, peer)) | |
592 | bgp_announce_route_all (peer); | |
593 | ||
594 | /* Resume the queue processing. This should trigger the event that would take | |
595 | care of processing any work that was queued during the read-only mode. */ | |
596 | work_queue_unplug(bm->process_main_queue); | |
597 | work_queue_unplug(bm->process_rsclient_queue); | |
598 | } | |
599 | ||
cb1faec9 DS |
600 | /** |
601 | * see bgp_fsm.h | |
602 | */ | |
603 | void | |
604 | bgp_start_routeadv (struct bgp *bgp) | |
605 | { | |
606 | struct listnode *node, *nnode; | |
607 | struct peer *peer; | |
608 | ||
609 | for (ALL_LIST_ELEMENTS (bgp->peer, node, nnode, peer)) | |
610 | { | |
611 | if (peer->status != Established) | |
612 | continue; | |
613 | BGP_TIMER_OFF(peer->t_routeadv); | |
614 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
615 | } | |
616 | } | |
617 | ||
618 | /** | |
619 | * see bgp_fsm.h | |
620 | */ | |
621 | void | |
622 | bgp_adjust_routeadv (struct peer *peer) | |
623 | { | |
624 | time_t nowtime = bgp_clock(); | |
625 | double diff; | |
626 | unsigned long remain; | |
627 | ||
628 | /* | |
629 | * CASE I: | |
630 | * If the last update was written more than MRAI back, expire the timer | |
631 | * instantly so that we can send the update out sooner. | |
632 | * | |
633 | * <------- MRAI ---------> | |
634 | * |-----------------|-----------------------| | |
635 | * <------------- m ------------> | |
636 | * ^ ^ ^ | |
637 | * | | | | |
638 | * | | current time | |
639 | * | timer start | |
640 | * last write | |
641 | * | |
642 | * m > MRAI | |
643 | */ | |
644 | diff = difftime(nowtime, peer->last_write); | |
645 | if (diff > (double) peer->v_routeadv) | |
646 | { | |
647 | BGP_TIMER_OFF(peer->t_routeadv); | |
648 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
649 | if (BGP_DEBUG (update, UPDATE_OUT)) | |
650 | zlog (peer->log, LOG_DEBUG, "%s: MRAI timer to expire instantly\n", | |
651 | peer->host); | |
652 | return; | |
653 | } | |
654 | ||
655 | /* | |
656 | * CASE II: | |
657 | * - Find when to expire the MRAI timer. | |
658 | * If MRAI timer is not active, assume we can start it now. | |
659 | * | |
660 | * <------- MRAI ---------> | |
661 | * |------------|-----------------------| | |
662 | * <-------- m ----------><----- r -----> | |
663 | * ^ ^ ^ | |
664 | * | | | | |
665 | * | | current time | |
666 | * | timer start | |
667 | * last write | |
668 | * | |
669 | * (MRAI - m) < r | |
670 | */ | |
671 | if (peer->t_routeadv) | |
672 | remain = thread_timer_remain_second(peer->t_routeadv); | |
673 | else | |
674 | remain = peer->v_routeadv; | |
675 | diff = peer->v_routeadv - diff; | |
676 | if (diff <= (double) remain) | |
677 | { | |
678 | BGP_TIMER_OFF(peer->t_routeadv); | |
679 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, diff); | |
680 | if (BGP_DEBUG (update, UPDATE_OUT)) | |
681 | zlog (peer->log, LOG_DEBUG, "%s: MRAI timer to expire in %f secs\n", | |
682 | peer->host, diff); | |
683 | } | |
684 | } | |
685 | ||
f188f2c4 DS |
686 | /* The update delay timer expiry callback. */ |
687 | static int | |
688 | bgp_update_delay_timer (struct thread *thread) | |
689 | { | |
690 | struct bgp *bgp; | |
691 | ||
692 | zlog_info ("Update delay ended - timer expired."); | |
693 | ||
694 | bgp = THREAD_ARG (thread); | |
695 | THREAD_TIMER_OFF (bgp->t_update_delay); | |
696 | bgp_update_delay_end(bgp); | |
697 | ||
698 | return 0; | |
699 | } | |
700 | ||
701 | /* The establish wait timer expiry callback. */ | |
702 | static int | |
703 | bgp_establish_wait_timer (struct thread *thread) | |
704 | { | |
705 | struct bgp *bgp; | |
706 | ||
707 | zlog_info ("Establish wait - timer expired."); | |
708 | ||
709 | bgp = THREAD_ARG (thread); | |
710 | THREAD_TIMER_OFF (bgp->t_establish_wait); | |
711 | bgp_check_update_delay(bgp); | |
712 | ||
713 | return 0; | |
714 | } | |
715 | ||
716 | /* Steps to begin the update delay: | |
717 | - initialize queues if needed | |
718 | - stop the queue processing | |
719 | - start the timer */ | |
720 | static void | |
721 | bgp_update_delay_begin (struct bgp *bgp) | |
722 | { | |
723 | struct listnode *node, *nnode; | |
724 | struct peer *peer; | |
725 | ||
726 | if ((bm->process_main_queue == NULL) || | |
727 | (bm->process_rsclient_queue == NULL)) | |
728 | bgp_process_queue_init(); | |
729 | ||
730 | /* Stop the processing of queued work. Enqueue shall continue */ | |
731 | work_queue_plug(bm->process_main_queue); | |
732 | work_queue_plug(bm->process_rsclient_queue); | |
733 | ||
734 | for (ALL_LIST_ELEMENTS (bgp->peer, node, nnode, peer)) | |
735 | peer->update_delay_over = 0; | |
736 | ||
737 | /* Start the update-delay timer */ | |
738 | THREAD_TIMER_ON (master, bgp->t_update_delay, bgp_update_delay_timer, | |
739 | bgp, bgp->v_update_delay); | |
740 | ||
741 | if (bgp->v_establish_wait != bgp->v_update_delay) | |
742 | THREAD_TIMER_ON (master, bgp->t_establish_wait, bgp_establish_wait_timer, | |
743 | bgp, bgp->v_establish_wait); | |
744 | ||
745 | quagga_timestamp(3, bgp->update_delay_begin_time, | |
746 | sizeof(bgp->update_delay_begin_time)); | |
747 | } | |
748 | ||
749 | static void | |
750 | bgp_update_delay_process_status_change(struct peer *peer) | |
751 | { | |
752 | if (peer->status == Established) | |
753 | { | |
754 | if (!peer->bgp->established++) | |
755 | { | |
756 | bgp_update_delay_begin(peer->bgp); | |
757 | zlog_info ("Begin read-only mode - update-delay timer %d seconds", | |
758 | peer->bgp->v_update_delay); | |
759 | } | |
760 | if (CHECK_FLAG (peer->cap, PEER_CAP_RESTART_BIT_RCV)) | |
761 | bgp_update_restarted_peers(peer); | |
762 | } | |
763 | if (peer->ostatus == Established && bgp_update_delay_active(peer->bgp)) | |
764 | { | |
765 | /* Adjust the update-delay state to account for this flap. | |
766 | NOTE: Intentionally skipping adjusting implicit_eors or explicit_eors | |
767 | counters. Extra sanity check in bgp_check_update_delay() should | |
768 | be enough to take care of any additive discrepancy in bgp eor | |
769 | counters */ | |
770 | peer->bgp->established--; | |
771 | peer->update_delay_over = 0; | |
772 | } | |
773 | } | |
774 | ||
200df115 | 775 | /* Called after event occured, this function change status and reset |
776 | read/write and timer thread. */ | |
777 | void | |
778 | bgp_fsm_change_status (struct peer *peer, int status) | |
779 | { | |
1ff9a340 | 780 | |
200df115 | 781 | bgp_dump_state (peer, peer->status, status); |
782 | ||
f2c31acb PJ |
783 | /* Transition into Clearing or Deleted must /always/ clear all routes.. |
784 | * (and must do so before actually changing into Deleted.. | |
785 | */ | |
786 | if (status >= Clearing) | |
787 | bgp_clear_route_all (peer); | |
788 | ||
200df115 | 789 | /* Preserve old status and change into new status. */ |
790 | peer->ostatus = peer->status; | |
791 | peer->status = status; | |
f188f2c4 | 792 | |
1ff9a340 DS |
793 | if (status == Established) |
794 | UNSET_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER); | |
795 | ||
f188f2c4 DS |
796 | /* If update-delay processing is applicable, do the necessary. */ |
797 | if (bgp_update_delay_configured(peer->bgp) && | |
798 | bgp_update_delay_applicable(peer->bgp)) | |
799 | bgp_update_delay_process_status_change(peer); | |
800 | ||
200df115 | 801 | if (BGP_DEBUG (normal, NORMAL)) |
802 | zlog_debug ("%s went from %s to %s", | |
803 | peer->host, | |
804 | LOOKUP (bgp_status_msg, peer->ostatus), | |
805 | LOOKUP (bgp_status_msg, peer->status)); | |
806 | } | |
807 | ||
3117b5c4 | 808 | /* Flush the event queue and ensure the peer is shut down */ |
9e4ca89c | 809 | static int |
3117b5c4 SH |
810 | bgp_clearing_completed (struct peer *peer) |
811 | { | |
812 | int rc = bgp_stop(peer); | |
1ff9a340 DS |
813 | |
814 | if (rc >= 0) | |
815 | BGP_EVENT_FLUSH (peer); | |
3117b5c4 SH |
816 | |
817 | return rc; | |
818 | } | |
819 | ||
718e3744 | 820 | /* Administrative BGP peer stop event. */ |
3117b5c4 | 821 | /* May be called multiple times for the same peer */ |
718e3744 | 822 | int |
823 | bgp_stop (struct peer *peer) | |
824 | { | |
718e3744 | 825 | afi_t afi; |
826 | safi_t safi; | |
827 | char orf_name[BUFSIZ]; | |
1ff9a340 | 828 | int ret = 0; |
718e3744 | 829 | |
3117b5c4 SH |
830 | /* Can't do this in Clearing; events are used for state transitions */ |
831 | if (peer->status != Clearing) | |
2158ad23 PJ |
832 | { |
833 | /* Delete all existing events of the peer */ | |
834 | BGP_EVENT_FLUSH (peer); | |
835 | } | |
dcdf399f | 836 | |
718e3744 | 837 | /* Increment Dropped count. */ |
838 | if (peer->status == Established) | |
839 | { | |
718e3744 | 840 | peer->dropped++; |
848973c7 | 841 | |
842 | /* bgp log-neighbor-changes of neighbor Down */ | |
843 | if (bgp_flag_check (peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) | |
e0701b79 | 844 | zlog_info ("%%ADJCHANGE: neighbor %s Down %s", peer->host, |
845 | peer_down_str [(int) peer->last_reset]); | |
848973c7 | 846 | |
93406d87 | 847 | /* graceful restart */ |
848 | if (peer->t_gr_stale) | |
849 | { | |
850 | BGP_TIMER_OFF (peer->t_gr_stale); | |
851 | if (BGP_DEBUG (events, EVENTS)) | |
852 | zlog_debug ("%s graceful restart stalepath timer stopped", peer->host); | |
853 | } | |
854 | if (CHECK_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT)) | |
855 | { | |
856 | if (BGP_DEBUG (events, EVENTS)) | |
857 | { | |
858 | zlog_debug ("%s graceful restart timer started for %d sec", | |
859 | peer->host, peer->v_gr_restart); | |
860 | zlog_debug ("%s graceful restart stalepath timer started for %d sec", | |
861 | peer->host, peer->bgp->stalepath_time); | |
862 | } | |
863 | BGP_TIMER_ON (peer->t_gr_restart, bgp_graceful_restart_timer_expire, | |
864 | peer->v_gr_restart); | |
865 | BGP_TIMER_ON (peer->t_gr_stale, bgp_graceful_stale_timer_expire, | |
866 | peer->bgp->stalepath_time); | |
867 | } | |
868 | else | |
869 | { | |
870 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_MODE); | |
871 | ||
872 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
0a28130d | 873 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_3 ; safi++) |
93406d87 | 874 | peer->nsf[afi][safi] = 0; |
875 | } | |
876 | ||
848973c7 | 877 | /* set last reset time */ |
65957886 | 878 | peer->resettime = peer->uptime = bgp_clock (); |
848973c7 | 879 | |
718e3744 | 880 | #ifdef HAVE_SNMP |
881 | bgpTrapBackwardTransition (peer); | |
882 | #endif /* HAVE_SNMP */ | |
718e3744 | 883 | |
f418446b | 884 | /* Reset peer synctime */ |
885 | peer->synctime = 0; | |
538621f2 | 886 | } |
718e3744 | 887 | |
888 | /* Stop read and write threads when exists. */ | |
889 | BGP_READ_OFF (peer->t_read); | |
890 | BGP_WRITE_OFF (peer->t_write); | |
891 | ||
892 | /* Stop all timers. */ | |
893 | BGP_TIMER_OFF (peer->t_start); | |
894 | BGP_TIMER_OFF (peer->t_connect); | |
895 | BGP_TIMER_OFF (peer->t_holdtime); | |
896 | BGP_TIMER_OFF (peer->t_keepalive); | |
897 | BGP_TIMER_OFF (peer->t_asorig); | |
898 | BGP_TIMER_OFF (peer->t_routeadv); | |
899 | ||
718e3744 | 900 | /* Stream reset. */ |
901 | peer->packet_size = 0; | |
902 | ||
903 | /* Clear input and output buffer. */ | |
904 | if (peer->ibuf) | |
905 | stream_reset (peer->ibuf); | |
906 | if (peer->work) | |
907 | stream_reset (peer->work); | |
200df115 | 908 | if (peer->obuf) |
909 | stream_fifo_clean (peer->obuf); | |
718e3744 | 910 | |
eb821189 | 911 | /* Close of file descriptor. */ |
912 | if (peer->fd >= 0) | |
913 | { | |
914 | close (peer->fd); | |
915 | peer->fd = -1; | |
916 | } | |
718e3744 | 917 | |
718e3744 | 918 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) |
919 | for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++) | |
920 | { | |
538621f2 | 921 | /* Reset all negotiated variables */ |
922 | peer->afc_nego[afi][safi] = 0; | |
923 | peer->afc_adv[afi][safi] = 0; | |
924 | peer->afc_recv[afi][safi] = 0; | |
925 | ||
718e3744 | 926 | /* peer address family capability flags*/ |
927 | peer->af_cap[afi][safi] = 0; | |
538621f2 | 928 | |
718e3744 | 929 | /* peer address family status flags*/ |
930 | peer->af_sflags[afi][safi] = 0; | |
538621f2 | 931 | |
718e3744 | 932 | /* Received ORF prefix-filter */ |
933 | peer->orf_plist[afi][safi] = NULL; | |
538621f2 | 934 | |
1ff9a340 DS |
935 | if ((peer->status == OpenConfirm) || (peer->status == Established)) { |
936 | /* ORF received prefix-filter pnt */ | |
937 | sprintf (orf_name, "%s.%d.%d", peer->host, afi, safi); | |
938 | prefix_bgp_orf_remove_all (orf_name); | |
939 | } | |
718e3744 | 940 | } |
941 | ||
942 | /* Reset keepalive and holdtime */ | |
943 | if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER)) | |
944 | { | |
945 | peer->v_keepalive = peer->keepalive; | |
946 | peer->v_holdtime = peer->holdtime; | |
947 | } | |
948 | else | |
949 | { | |
950 | peer->v_keepalive = peer->bgp->default_keepalive; | |
951 | peer->v_holdtime = peer->bgp->default_holdtime; | |
952 | } | |
953 | ||
954 | peer->update_time = 0; | |
955 | ||
956 | /* Until we are sure that there is no problem about prefix count | |
957 | this should be commented out.*/ | |
958 | #if 0 | |
959 | /* Reset prefix count */ | |
960 | peer->pcount[AFI_IP][SAFI_UNICAST] = 0; | |
961 | peer->pcount[AFI_IP][SAFI_MULTICAST] = 0; | |
962 | peer->pcount[AFI_IP][SAFI_MPLS_VPN] = 0; | |
963 | peer->pcount[AFI_IP6][SAFI_UNICAST] = 0; | |
964 | peer->pcount[AFI_IP6][SAFI_MULTICAST] = 0; | |
965 | #endif /* 0 */ | |
966 | ||
1ff9a340 DS |
967 | if (!CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE) && |
968 | !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) | |
969 | { | |
970 | peer_delete(peer); | |
971 | ret = -1; | |
972 | } | |
a80beece DS |
973 | else |
974 | { | |
975 | bgp_peer_conf_if_to_su_update(peer); | |
976 | } | |
1ff9a340 DS |
977 | |
978 | return ret; | |
718e3744 | 979 | } |
980 | ||
981 | /* BGP peer is stoped by the error. */ | |
94f2b392 | 982 | static int |
718e3744 | 983 | bgp_stop_with_error (struct peer *peer) |
984 | { | |
985 | /* Double start timer. */ | |
986 | peer->v_start *= 2; | |
987 | ||
988 | /* Overflow check. */ | |
989 | if (peer->v_start >= (60 * 2)) | |
990 | peer->v_start = (60 * 2); | |
991 | ||
1ff9a340 | 992 | return(bgp_stop (peer)); |
718e3744 | 993 | } |
994 | ||
397b5bde LR |
995 | |
996 | /* something went wrong, send notify and tear down */ | |
997 | static int | |
998 | bgp_stop_with_notify (struct peer *peer, u_char code, u_char sub_code) | |
999 | { | |
1000 | /* Send notify to remote peer */ | |
1001 | bgp_notify_send (peer, code, sub_code); | |
1002 | ||
397b5bde LR |
1003 | /* Clear start timer value to default. */ |
1004 | peer->v_start = BGP_INIT_START_TIMER; | |
1005 | ||
1ff9a340 | 1006 | return(bgp_stop(peer)); |
397b5bde LR |
1007 | } |
1008 | ||
1009 | ||
718e3744 | 1010 | /* TCP connection open. Next we send open message to remote peer. And |
1011 | add read thread for reading open message. */ | |
94f2b392 | 1012 | static int |
718e3744 | 1013 | bgp_connect_success (struct peer *peer) |
1014 | { | |
1ff9a340 DS |
1015 | int ret = 0; |
1016 | ||
eb821189 | 1017 | if (peer->fd < 0) |
718e3744 | 1018 | { |
1019 | zlog_err ("bgp_connect_success peer's fd is negative value %d", | |
eb821189 | 1020 | peer->fd); |
1ff9a340 | 1021 | bgp_stop(peer); |
718e3744 | 1022 | return -1; |
1023 | } | |
718e3744 | 1024 | |
1ff9a340 DS |
1025 | if (bgp_getsockname (peer) < 0) |
1026 | { | |
1027 | zlog_err ("%s: bgp_getsockname(): failed for peer %s", __FUNCTION__, | |
1028 | peer->host); | |
1029 | bgp_notify_send(peer, BGP_NOTIFY_FSM_ERR, 0); /* internal error */ | |
1030 | return -1; | |
1031 | } | |
1032 | ||
1033 | BGP_READ_ON (peer->t_read, bgp_read, peer->fd); | |
f418446b | 1034 | |
1035 | if (BGP_DEBUG (normal, NORMAL)) | |
1036 | { | |
682ca04c JBD |
1037 | char buf1[SU_ADDRSTRLEN]; |
1038 | ||
f418446b | 1039 | if (! CHECK_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
1040 | zlog_debug ("%s open active, local address %s", peer->host, | |
1041 | sockunion2str (peer->su_local, buf1, SU_ADDRSTRLEN)); | |
1042 | else | |
1043 | zlog_debug ("%s passive open", peer->host); | |
1044 | } | |
718e3744 | 1045 | |
1ff9a340 | 1046 | bgp_open_send (peer); |
718e3744 | 1047 | |
1048 | return 0; | |
1049 | } | |
1050 | ||
1051 | /* TCP connect fail */ | |
94f2b392 | 1052 | static int |
718e3744 | 1053 | bgp_connect_fail (struct peer *peer) |
1054 | { | |
1ff9a340 | 1055 | return (bgp_stop (peer)); |
718e3744 | 1056 | } |
1057 | ||
1058 | /* This function is the first starting point of all BGP connection. It | |
1059 | try to connect to remote peer with non-blocking IO. */ | |
1060 | int | |
1061 | bgp_start (struct peer *peer) | |
1062 | { | |
1063 | int status; | |
1064 | ||
a80beece DS |
1065 | bgp_peer_conf_if_to_su_update(peer); |
1066 | ||
ca058a30 PJ |
1067 | if (BGP_PEER_START_SUPPRESSED (peer)) |
1068 | { | |
1069 | if (BGP_DEBUG (fsm, FSM)) | |
1070 | plog_err (peer->log, "%s [FSM] Trying to start suppressed peer" | |
1071 | " - this is never supposed to happen!", peer->host); | |
1072 | return -1; | |
1073 | } | |
1074 | ||
33d5ab9e PJ |
1075 | /* Scrub some information that might be left over from a previous, |
1076 | * session | |
1077 | */ | |
1078 | /* Connection information. */ | |
1079 | if (peer->su_local) | |
1080 | { | |
1081 | sockunion_free (peer->su_local); | |
1082 | peer->su_local = NULL; | |
1083 | } | |
1084 | ||
1085 | if (peer->su_remote) | |
1086 | { | |
1087 | sockunion_free (peer->su_remote); | |
1088 | peer->su_remote = NULL; | |
1089 | } | |
1090 | ||
1091 | /* Clear remote router-id. */ | |
1092 | peer->remote_id.s_addr = 0; | |
1093 | ||
1094 | /* Clear peer capability flag. */ | |
1095 | peer->cap = 0; | |
1096 | ||
718e3744 | 1097 | /* If the peer is passive mode, force to move to Active mode. */ |
1098 | if (CHECK_FLAG (peer->flags, PEER_FLAG_PASSIVE)) | |
1099 | { | |
1100 | BGP_EVENT_ADD (peer, TCP_connection_open_failed); | |
1101 | return 0; | |
1102 | } | |
1103 | ||
1104 | status = bgp_connect (peer); | |
1105 | ||
1106 | switch (status) | |
1107 | { | |
1108 | case connect_error: | |
1109 | if (BGP_DEBUG (fsm, FSM)) | |
8c2e200a | 1110 | plog_debug (peer->log, "%s [FSM] Connect error", peer->host); |
718e3744 | 1111 | BGP_EVENT_ADD (peer, TCP_connection_open_failed); |
1112 | break; | |
1113 | case connect_success: | |
1114 | if (BGP_DEBUG (fsm, FSM)) | |
8c2e200a | 1115 | plog_debug (peer->log, "%s [FSM] Connect immediately success", |
eb821189 | 1116 | peer->host); |
718e3744 | 1117 | BGP_EVENT_ADD (peer, TCP_connection_open); |
1118 | break; | |
1119 | case connect_in_progress: | |
1120 | /* To check nonblocking connect, we wait until socket is | |
1121 | readable or writable. */ | |
1122 | if (BGP_DEBUG (fsm, FSM)) | |
8c2e200a | 1123 | plog_debug (peer->log, "%s [FSM] Non blocking connect waiting result", |
eb821189 | 1124 | peer->host); |
1125 | if (peer->fd < 0) | |
718e3744 | 1126 | { |
1127 | zlog_err ("bgp_start peer's fd is negative value %d", | |
eb821189 | 1128 | peer->fd); |
718e3744 | 1129 | return -1; |
1130 | } | |
eb821189 | 1131 | BGP_READ_ON (peer->t_read, bgp_read, peer->fd); |
1132 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); | |
718e3744 | 1133 | break; |
1134 | } | |
1135 | return 0; | |
1136 | } | |
1137 | ||
1138 | /* Connect retry timer is expired when the peer status is Connect. */ | |
94f2b392 | 1139 | static int |
718e3744 | 1140 | bgp_reconnect (struct peer *peer) |
1141 | { | |
1ff9a340 DS |
1142 | int ret = 0; |
1143 | ||
1144 | if (bgp_stop (peer) > 0) | |
1145 | bgp_start (peer); | |
1146 | else | |
1147 | ret = -1; | |
1148 | ||
1149 | return ret; | |
718e3744 | 1150 | } |
1151 | ||
94f2b392 | 1152 | static int |
718e3744 | 1153 | bgp_fsm_open (struct peer *peer) |
1154 | { | |
1155 | /* Send keepalive and make keepalive timer */ | |
1156 | bgp_keepalive_send (peer); | |
1157 | ||
1158 | /* Reset holdtimer value. */ | |
1159 | BGP_TIMER_OFF (peer->t_holdtime); | |
1160 | ||
1161 | return 0; | |
1162 | } | |
1163 | ||
718e3744 | 1164 | /* Keepalive send to peer. */ |
94f2b392 | 1165 | static int |
718e3744 | 1166 | bgp_fsm_keepalive_expire (struct peer *peer) |
1167 | { | |
cb1faec9 DS |
1168 | /* |
1169 | * If there are UPDATE messages to send, no need to send keepalive. The | |
1170 | * peer will note our progress through the UPDATEs. | |
1171 | */ | |
1172 | if (!bgp_routeq_empty(peer)) | |
1173 | return 0; | |
f188f2c4 | 1174 | |
718e3744 | 1175 | bgp_keepalive_send (peer); |
1176 | return 0; | |
1177 | } | |
1178 | ||
397b5bde LR |
1179 | /* FSM error, unexpected event. This is error of BGP connection. So cut the |
1180 | peer and change to Idle status. */ | |
1181 | static int | |
1182 | bgp_fsm_event_error (struct peer *peer) | |
1183 | { | |
1184 | plog_err (peer->log, "%s [FSM] unexpected packet received in state %s", | |
1185 | peer->host, LOOKUP (bgp_status_msg, peer->status)); | |
1186 | ||
1187 | return bgp_stop_with_notify (peer, BGP_NOTIFY_FSM_ERR, 0); | |
1188 | } | |
1189 | ||
718e3744 | 1190 | /* Hold timer expire. This is error of BGP connection. So cut the |
1191 | peer and change to Idle status. */ | |
94f2b392 | 1192 | static int |
718e3744 | 1193 | bgp_fsm_holdtime_expire (struct peer *peer) |
1194 | { | |
1195 | if (BGP_DEBUG (fsm, FSM)) | |
397b5bde | 1196 | plog_debug (peer->log, "%s [FSM] Hold timer expire", peer->host); |
718e3744 | 1197 | |
397b5bde | 1198 | return bgp_stop_with_notify (peer, BGP_NOTIFY_HOLD_ERR, 0); |
718e3744 | 1199 | } |
1200 | ||
1201 | /* Status goes to Established. Send keepalive packet then make first | |
1202 | update information. */ | |
94f2b392 | 1203 | static int |
718e3744 | 1204 | bgp_establish (struct peer *peer) |
1205 | { | |
1206 | struct bgp_notify *notify; | |
1207 | afi_t afi; | |
1208 | safi_t safi; | |
93406d87 | 1209 | int nsf_af_count = 0; |
1ff9a340 DS |
1210 | int ret = 0; |
1211 | struct peer *other; | |
1212 | ||
1213 | other = peer->doppelganger; | |
1214 | peer = peer_xfer_conn(peer); | |
1215 | if (!peer) | |
1216 | { | |
1217 | zlog_err ("%%Neighbor failed in xfer_conn"); | |
1218 | return -1; | |
1219 | } | |
1220 | ||
1221 | if (other == peer) | |
1222 | ret = 1; /* bgp_establish specific code when xfer_conn happens. */ | |
718e3744 | 1223 | |
1224 | /* Reset capability open status flag. */ | |
1225 | if (! CHECK_FLAG (peer->sflags, PEER_STATUS_CAPABILITY_OPEN)) | |
1226 | SET_FLAG (peer->sflags, PEER_STATUS_CAPABILITY_OPEN); | |
1227 | ||
1228 | /* Clear last notification data. */ | |
1229 | notify = &peer->notify; | |
1230 | if (notify->data) | |
1231 | XFREE (MTYPE_TMP, notify->data); | |
1232 | memset (notify, 0, sizeof (struct bgp_notify)); | |
1233 | ||
1234 | /* Clear start timer value to default. */ | |
1235 | peer->v_start = BGP_INIT_START_TIMER; | |
1236 | ||
1237 | /* Increment established count. */ | |
1238 | peer->established++; | |
1239 | bgp_fsm_change_status (peer, Established); | |
848973c7 | 1240 | |
1241 | /* bgp log-neighbor-changes of neighbor Up */ | |
1242 | if (bgp_flag_check (peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) | |
1243 | zlog_info ("%%ADJCHANGE: neighbor %s Up", peer->host); | |
1244 | ||
93406d87 | 1245 | /* graceful restart */ |
1246 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT); | |
1247 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
0a28130d | 1248 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_3 ; safi++) |
93406d87 | 1249 | { |
1250 | if (peer->afc_nego[afi][safi] | |
1251 | && CHECK_FLAG (peer->cap, PEER_CAP_RESTART_ADV) | |
1252 | && CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_RESTART_AF_RCV)) | |
1253 | { | |
1254 | if (peer->nsf[afi][safi] | |
1255 | && ! CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_RESTART_AF_PRESERVE_RCV)) | |
1256 | bgp_clear_stale_route (peer, afi, safi); | |
1257 | ||
1258 | peer->nsf[afi][safi] = 1; | |
1259 | nsf_af_count++; | |
1260 | } | |
1261 | else | |
1262 | { | |
1263 | if (peer->nsf[afi][safi]) | |
1264 | bgp_clear_stale_route (peer, afi, safi); | |
1265 | peer->nsf[afi][safi] = 0; | |
1266 | } | |
1267 | } | |
1268 | ||
1269 | if (nsf_af_count) | |
1270 | SET_FLAG (peer->sflags, PEER_STATUS_NSF_MODE); | |
1271 | else | |
1272 | { | |
1273 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_MODE); | |
1274 | if (peer->t_gr_stale) | |
1275 | { | |
1276 | BGP_TIMER_OFF (peer->t_gr_stale); | |
1277 | if (BGP_DEBUG (events, EVENTS)) | |
1278 | zlog_debug ("%s graceful restart stalepath timer stopped", peer->host); | |
1279 | } | |
1280 | } | |
1281 | ||
1282 | if (peer->t_gr_restart) | |
1283 | { | |
1284 | BGP_TIMER_OFF (peer->t_gr_restart); | |
1285 | if (BGP_DEBUG (events, EVENTS)) | |
1286 | zlog_debug ("%s graceful restart timer stopped", peer->host); | |
1287 | } | |
1288 | ||
718e3744 | 1289 | #ifdef HAVE_SNMP |
1290 | bgpTrapEstablished (peer); | |
1291 | #endif /* HAVE_SNMP */ | |
1292 | ||
1293 | /* Reset uptime, send keepalive, send current table. */ | |
65957886 | 1294 | peer->uptime = bgp_clock (); |
718e3744 | 1295 | |
1296 | /* Send route-refresh when ORF is enabled */ | |
1297 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
1298 | for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++) | |
1299 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_SM_ADV)) | |
1300 | { | |
1301 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_RM_RCV)) | |
1302 | bgp_route_refresh_send (peer, afi, safi, ORF_TYPE_PREFIX, | |
1303 | REFRESH_IMMEDIATE, 0); | |
1304 | else if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_RM_OLD_RCV)) | |
1305 | bgp_route_refresh_send (peer, afi, safi, ORF_TYPE_PREFIX_OLD, | |
1306 | REFRESH_IMMEDIATE, 0); | |
1307 | } | |
1308 | ||
718e3744 | 1309 | /* First update is deferred until ORF or ROUTE-REFRESH is received */ |
1310 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
1311 | for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++) | |
1312 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_RM_ADV)) | |
1313 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_SM_RCV) | |
1314 | || CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_SM_OLD_RCV)) | |
1315 | SET_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_ORF_WAIT_REFRESH); | |
1316 | ||
1317 | bgp_announce_route_all (peer); | |
1318 | ||
cb1faec9 DS |
1319 | /* Start the route advertisement timer to send updates to the peer - if BGP |
1320 | * is not in read-only mode. If it is, the timer will be started at the end | |
1321 | * of read-only mode. | |
1322 | */ | |
1323 | if (!bgp_update_delay_active(peer->bgp)) | |
1324 | BGP_TIMER_ON (peer->t_routeadv, bgp_routeadv_timer, 0); | |
718e3744 | 1325 | |
1ff9a340 DS |
1326 | if (peer->doppelganger && (peer->doppelganger->status != Deleted)) |
1327 | { | |
1328 | if (BGP_DEBUG (events, EVENTS)) | |
1329 | zlog_debug("[Event] Deleting stub connection for peer %s", peer->host); | |
1330 | ||
1331 | if (peer->doppelganger->status > Active) | |
1332 | bgp_notify_send (peer->doppelganger, BGP_NOTIFY_CEASE, | |
1333 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
1334 | else | |
1335 | peer_delete(peer->doppelganger); | |
1336 | } | |
1337 | ||
1338 | return ret; | |
718e3744 | 1339 | } |
1340 | ||
1341 | /* Keepalive packet is received. */ | |
94f2b392 | 1342 | static int |
718e3744 | 1343 | bgp_fsm_keepalive (struct peer *peer) |
1344 | { | |
f188f2c4 DS |
1345 | bgp_update_implicit_eors(peer); |
1346 | ||
718e3744 | 1347 | /* peer count update */ |
1348 | peer->keepalive_in++; | |
1349 | ||
1350 | BGP_TIMER_OFF (peer->t_holdtime); | |
1351 | return 0; | |
1352 | } | |
1353 | ||
1354 | /* Update packet is received. */ | |
94f2b392 | 1355 | static int |
718e3744 | 1356 | bgp_fsm_update (struct peer *peer) |
1357 | { | |
1358 | BGP_TIMER_OFF (peer->t_holdtime); | |
1359 | return 0; | |
1360 | } | |
1361 | ||
1362 | /* This is empty event. */ | |
94f2b392 | 1363 | static int |
718e3744 | 1364 | bgp_ignore (struct peer *peer) |
1365 | { | |
1366 | if (BGP_DEBUG (fsm, FSM)) | |
1367 | zlog (peer->log, LOG_DEBUG, "%s [FSM] bgp_ignore called", peer->host); | |
1368 | return 0; | |
1369 | } | |
6b0655a2 | 1370 | |
718e3744 | 1371 | /* Finite State Machine structure */ |
fda1d3e0 | 1372 | static const struct { |
66e5cd87 | 1373 | int (*func) (struct peer *); |
718e3744 | 1374 | int next_state; |
1375 | } FSM [BGP_STATUS_MAX - 1][BGP_EVENTS_MAX - 1] = | |
1376 | { | |
1377 | { | |
1378 | /* Idle state: In Idle state, all events other than BGP_Start is | |
1379 | ignored. With BGP_Start event, finite state machine calls | |
1380 | bgp_start(). */ | |
1381 | {bgp_start, Connect}, /* BGP_Start */ | |
1382 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1383 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1384 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1385 | {bgp_ignore, Idle}, /* TCP_connection_open_failed */ | |
1386 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1387 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ | |
1388 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
1389 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
1390 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
1391 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
1392 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
1393 | {bgp_ignore, Idle}, /* Receive_NOTIFICATION_message */ | |
ca058a30 | 1394 | {bgp_ignore, Idle}, /* Clearing_Completed */ |
718e3744 | 1395 | }, |
1396 | { | |
1397 | /* Connect */ | |
1398 | {bgp_ignore, Connect}, /* BGP_Start */ | |
1399 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1400 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1401 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1402 | {bgp_connect_fail, Active}, /* TCP_connection_open_failed */ | |
1403 | {bgp_connect_fail, Idle}, /* TCP_fatal_error */ | |
1404 | {bgp_reconnect, Connect}, /* ConnectRetry_timer_expired */ | |
1405 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
1406 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
1407 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
1408 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
1409 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
1410 | {bgp_stop, Idle}, /* Receive_NOTIFICATION_message */ | |
ca058a30 | 1411 | {bgp_ignore, Idle}, /* Clearing_Completed */ |
718e3744 | 1412 | }, |
1413 | { | |
1414 | /* Active, */ | |
1415 | {bgp_ignore, Active}, /* BGP_Start */ | |
1416 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1417 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1418 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1419 | {bgp_ignore, Active}, /* TCP_connection_open_failed */ | |
1420 | {bgp_ignore, Idle}, /* TCP_fatal_error */ | |
1421 | {bgp_start, Connect}, /* ConnectRetry_timer_expired */ | |
1422 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
1423 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
1424 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
1425 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
1426 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
1427 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
ca058a30 | 1428 | {bgp_ignore, Idle}, /* Clearing_Completed */ |
718e3744 | 1429 | }, |
1430 | { | |
1431 | /* OpenSent, */ | |
1432 | {bgp_ignore, OpenSent}, /* BGP_Start */ | |
1433 | {bgp_stop, Idle}, /* BGP_Stop */ | |
536792cd | 1434 | {bgp_stop, Active}, /* TCP_connection_open */ |
718e3744 | 1435 | {bgp_stop, Active}, /* TCP_connection_closed */ |
536792cd PJ |
1436 | {bgp_stop, Active}, /* TCP_connection_open_failed */ |
1437 | {bgp_stop, Active}, /* TCP_fatal_error */ | |
718e3744 | 1438 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ |
1439 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
1440 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
1441 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ | |
397b5bde LR |
1442 | {bgp_fsm_event_error, Idle}, /* Receive_KEEPALIVE_message */ |
1443 | {bgp_fsm_event_error, Idle}, /* Receive_UPDATE_message */ | |
718e3744 | 1444 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ |
ca058a30 | 1445 | {bgp_ignore, Idle}, /* Clearing_Completed */ |
718e3744 | 1446 | }, |
1447 | { | |
1448 | /* OpenConfirm, */ | |
1449 | {bgp_ignore, OpenConfirm}, /* BGP_Start */ | |
1450 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1451 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1452 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1453 | {bgp_stop, Idle}, /* TCP_connection_open_failed */ | |
1454 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1455 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ | |
1456 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
1457 | {bgp_ignore, OpenConfirm}, /* KeepAlive_timer_expired */ | |
1458 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
1459 | {bgp_establish, Established}, /* Receive_KEEPALIVE_message */ | |
1460 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
1461 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
ca058a30 | 1462 | {bgp_ignore, Idle}, /* Clearing_Completed */ |
718e3744 | 1463 | }, |
1464 | { | |
1465 | /* Established, */ | |
ca058a30 PJ |
1466 | {bgp_ignore, Established}, /* BGP_Start */ |
1467 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
1468 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1469 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
3117b5c4 | 1470 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ |
ca058a30 | 1471 | {bgp_stop, Clearing}, /* TCP_fatal_error */ |
3117b5c4 | 1472 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ |
ca058a30 | 1473 | {bgp_fsm_holdtime_expire, Clearing}, /* Hold_Timer_expired */ |
718e3744 | 1474 | {bgp_fsm_keepalive_expire, Established}, /* KeepAlive_timer_expired */ |
ca058a30 PJ |
1475 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ |
1476 | {bgp_fsm_keepalive, Established}, /* Receive_KEEPALIVE_message */ | |
1477 | {bgp_fsm_update, Established}, /* Receive_UPDATE_message */ | |
1478 | {bgp_stop_with_error, Clearing}, /* Receive_NOTIFICATION_message */ | |
1479 | {bgp_ignore, Idle}, /* Clearing_Completed */ | |
1480 | }, | |
1481 | { | |
1482 | /* Clearing, */ | |
1483 | {bgp_ignore, Clearing}, /* BGP_Start */ | |
3117b5c4 SH |
1484 | {bgp_stop, Clearing}, /* BGP_Stop */ |
1485 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1486 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
1487 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
1488 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
1489 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
1490 | {bgp_stop, Clearing}, /* Hold_Timer_expired */ | |
1491 | {bgp_stop, Clearing}, /* KeepAlive_timer_expired */ | |
1492 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
1493 | {bgp_stop, Clearing}, /* Receive_KEEPALIVE_message */ | |
1494 | {bgp_stop, Clearing}, /* Receive_UPDATE_message */ | |
1495 | {bgp_stop, Clearing}, /* Receive_NOTIFICATION_message */ | |
1496 | {bgp_clearing_completed, Idle}, /* Clearing_Completed */ | |
ca058a30 PJ |
1497 | }, |
1498 | { | |
1499 | /* Deleted, */ | |
1500 | {bgp_ignore, Deleted}, /* BGP_Start */ | |
1501 | {bgp_ignore, Deleted}, /* BGP_Stop */ | |
1502 | {bgp_ignore, Deleted}, /* TCP_connection_open */ | |
1503 | {bgp_ignore, Deleted}, /* TCP_connection_closed */ | |
1504 | {bgp_ignore, Deleted}, /* TCP_connection_open_failed */ | |
1505 | {bgp_ignore, Deleted}, /* TCP_fatal_error */ | |
1506 | {bgp_ignore, Deleted}, /* ConnectRetry_timer_expired */ | |
1507 | {bgp_ignore, Deleted}, /* Hold_Timer_expired */ | |
1508 | {bgp_ignore, Deleted}, /* KeepAlive_timer_expired */ | |
1509 | {bgp_ignore, Deleted}, /* Receive_OPEN_message */ | |
1510 | {bgp_ignore, Deleted}, /* Receive_KEEPALIVE_message */ | |
1511 | {bgp_ignore, Deleted}, /* Receive_UPDATE_message */ | |
1512 | {bgp_ignore, Deleted}, /* Receive_NOTIFICATION_message */ | |
1513 | {bgp_ignore, Deleted}, /* Clearing_Completed */ | |
718e3744 | 1514 | }, |
1515 | }; | |
1516 | ||
fd79ac91 | 1517 | static const char *bgp_event_str[] = |
718e3744 | 1518 | { |
1519 | NULL, | |
1520 | "BGP_Start", | |
1521 | "BGP_Stop", | |
1522 | "TCP_connection_open", | |
1523 | "TCP_connection_closed", | |
1524 | "TCP_connection_open_failed", | |
1525 | "TCP_fatal_error", | |
1526 | "ConnectRetry_timer_expired", | |
1527 | "Hold_Timer_expired", | |
1528 | "KeepAlive_timer_expired", | |
1529 | "Receive_OPEN_message", | |
1530 | "Receive_KEEPALIVE_message", | |
1531 | "Receive_UPDATE_message", | |
ca058a30 PJ |
1532 | "Receive_NOTIFICATION_message", |
1533 | "Clearing_Completed", | |
718e3744 | 1534 | }; |
1535 | ||
1536 | /* Execute event process. */ | |
1537 | int | |
1538 | bgp_event (struct thread *thread) | |
1539 | { | |
718e3744 | 1540 | int event; |
718e3744 | 1541 | struct peer *peer; |
1ff9a340 | 1542 | int ret; |
718e3744 | 1543 | |
1544 | peer = THREAD_ARG (thread); | |
1545 | event = THREAD_VAL (thread); | |
1546 | ||
1ff9a340 DS |
1547 | ret = bgp_event_update(peer, event); |
1548 | ||
1549 | return (ret); | |
1550 | } | |
1551 | ||
1552 | int | |
1553 | bgp_event_update (struct peer *peer, int event) | |
1554 | { | |
1555 | int next; | |
1556 | int ret = 0; | |
1557 | struct peer *other; | |
1558 | int passive_conn = 0; | |
1559 | ||
1560 | other = peer->doppelganger; | |
1561 | passive_conn = (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) ? 1 : 0; | |
1562 | ||
718e3744 | 1563 | /* Logging this event. */ |
1564 | next = FSM [peer->status -1][event - 1].next_state; | |
1565 | ||
ca058a30 | 1566 | if (BGP_DEBUG (fsm, FSM) && peer->status != next) |
1ff9a340 | 1567 | plog_debug (peer->log, "%s [FSM] %s (%s->%s)", peer->host, |
718e3744 | 1568 | bgp_event_str[event], |
1569 | LOOKUP (bgp_status_msg, peer->status), | |
1570 | LOOKUP (bgp_status_msg, next)); | |
718e3744 | 1571 | |
1572 | /* Call function. */ | |
ca058a30 PJ |
1573 | if (FSM [peer->status -1][event - 1].func) |
1574 | ret = (*(FSM [peer->status - 1][event - 1].func))(peer); | |
718e3744 | 1575 | |
1576 | /* When function do not want proceed next job return -1. */ | |
200df115 | 1577 | if (ret >= 0) |
1578 | { | |
1ff9a340 DS |
1579 | if (ret == 1 && next == Established) |
1580 | { | |
1581 | /* The case when doppelganger swap accurred in bgp_establish. | |
1582 | Update the peer pointer accordingly */ | |
1583 | peer = other; | |
1584 | } | |
1585 | ||
200df115 | 1586 | /* If status is changed. */ |
1587 | if (next != peer->status) | |
f2c31acb | 1588 | bgp_fsm_change_status (peer, next); |
95fdcd8a | 1589 | |
200df115 | 1590 | /* Make sure timer is set. */ |
1591 | bgp_timer_set (peer); | |
1ff9a340 DS |
1592 | |
1593 | } | |
1594 | else if (!passive_conn && peer->bgp) | |
1595 | { | |
1596 | /* If we got a return value of -1, that means there was an error, restart | |
1597 | * the FSM. If the peer structure was deleted | |
1598 | */ | |
1599 | bgp_fsm_change_status(peer, Idle); | |
1600 | bgp_timer_set(peer); | |
200df115 | 1601 | } |
200df115 | 1602 | return ret; |
718e3744 | 1603 | } |