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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" |
3f9c7369 | 34 | #include "queue.h" |
718e3744 | 35 | |
36 | #include "bgpd/bgpd.h" | |
37 | #include "bgpd/bgp_attr.h" | |
38 | #include "bgpd/bgp_debug.h" | |
39 | #include "bgpd/bgp_fsm.h" | |
40 | #include "bgpd/bgp_packet.h" | |
41 | #include "bgpd/bgp_network.h" | |
42 | #include "bgpd/bgp_route.h" | |
43 | #include "bgpd/bgp_dump.h" | |
44 | #include "bgpd/bgp_open.h" | |
f188f2c4 | 45 | #include "bgpd/bgp_advertise.h" |
718e3744 | 46 | #ifdef HAVE_SNMP |
47 | #include "bgpd/bgp_snmp.h" | |
48 | #endif /* HAVE_SNMP */ | |
3f9c7369 | 49 | #include "bgpd/bgp_updgrp.h" |
6b0655a2 | 50 | |
718e3744 | 51 | /* BGP FSM (finite state machine) has three types of functions. Type |
52 | one is thread functions. Type two is event functions. Type three | |
53 | is FSM functions. Timer functions are set by bgp_timer_set | |
54 | function. */ | |
55 | ||
56 | /* BGP event function. */ | |
57 | int bgp_event (struct thread *); | |
58 | ||
59 | /* BGP thread functions. */ | |
60 | static int bgp_start_timer (struct thread *); | |
61 | static int bgp_connect_timer (struct thread *); | |
62 | static int bgp_holdtime_timer (struct thread *); | |
63 | static int bgp_keepalive_timer (struct thread *); | |
64 | ||
65 | /* BGP FSM functions. */ | |
66 | static int bgp_start (struct peer *); | |
67 | ||
1ff9a340 DS |
68 | static void |
69 | peer_xfer_stats (struct peer *peer_dst, struct peer *peer_src) | |
70 | { | |
71 | /* Copy stats over. These are only the pre-established state stats */ | |
72 | peer_dst->open_in += peer_src->open_in; | |
73 | peer_dst->open_out += peer_src->open_out; | |
74 | peer_dst->keepalive_in += peer_src->keepalive_in; | |
75 | peer_dst->keepalive_out += peer_src->keepalive_out; | |
76 | peer_dst->notify_in += peer_src->notify_in; | |
77 | peer_dst->notify_out += peer_src->notify_out; | |
78 | peer_dst->dynamic_cap_in += peer_src->dynamic_cap_in; | |
79 | peer_dst->dynamic_cap_out += peer_src->dynamic_cap_out; | |
80 | } | |
81 | ||
82 | static struct peer * | |
83 | peer_xfer_conn(struct peer *from_peer) | |
84 | { | |
85 | struct peer *peer; | |
86 | afi_t afi; | |
87 | safi_t safi; | |
88 | int fd; | |
89 | int status, pstatus; | |
90 | ||
91 | assert(from_peer != NULL); | |
92 | ||
93 | peer = from_peer->doppelganger; | |
94 | ||
95 | if (!peer || !CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE)) | |
96 | return from_peer; | |
97 | ||
3f9c7369 DS |
98 | if (bgp_debug_neighbor_events(peer)) |
99 | zlog_debug ("peer transfer (%s -> %s)", from_peer->host, peer->host); | |
100 | ||
1ff9a340 DS |
101 | BGP_WRITE_OFF(peer->t_write); |
102 | BGP_READ_OFF(peer->t_read); | |
103 | BGP_WRITE_OFF(from_peer->t_write); | |
104 | BGP_READ_OFF(from_peer->t_read); | |
105 | ||
3f9c7369 DS |
106 | BGP_TIMER_OFF(peer->t_routeadv); |
107 | BGP_TIMER_OFF(from_peer->t_routeadv); | |
108 | ||
1ff9a340 DS |
109 | fd = peer->fd; |
110 | peer->fd = from_peer->fd; | |
111 | from_peer->fd = fd; | |
112 | stream_reset(peer->ibuf); | |
113 | stream_fifo_clean(peer->obuf); | |
114 | stream_fifo_clean(from_peer->obuf); | |
115 | ||
116 | peer->v_holdtime = from_peer->v_holdtime; | |
117 | peer->v_keepalive = from_peer->v_keepalive; | |
118 | peer->v_asorig = from_peer->v_asorig; | |
119 | peer->routeadv = from_peer->routeadv; | |
120 | peer->v_routeadv = from_peer->v_routeadv; | |
121 | peer->v_gr_restart = from_peer->v_gr_restart; | |
122 | peer->cap = from_peer->cap; | |
123 | status = peer->status; | |
124 | pstatus = peer->ostatus; | |
125 | peer->status = from_peer->status; | |
126 | peer->ostatus = from_peer->ostatus; | |
127 | from_peer->status = status; | |
128 | from_peer->ostatus = pstatus; | |
129 | peer->remote_id = from_peer->remote_id; | |
130 | ||
131 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
132 | for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++) | |
133 | { | |
134 | peer->af_flags[afi][safi] = from_peer->af_flags[afi][safi]; | |
135 | peer->af_sflags[afi][safi] = from_peer->af_sflags[afi][safi]; | |
136 | peer->af_cap[afi][safi] = from_peer->af_cap[afi][safi]; | |
137 | peer->afc_nego[afi][safi] = from_peer->afc_nego[afi][safi]; | |
138 | peer->afc_adv[afi][safi] = from_peer->afc_adv[afi][safi]; | |
139 | peer->afc_recv[afi][safi] = from_peer->afc_recv[afi][safi]; | |
140 | } | |
141 | ||
142 | if (bgp_getsockname(peer) < 0) | |
143 | { | |
144 | zlog_err ("%%bgp_getsockname() failed for %s peer %s fd %d (from_peer fd %d)", | |
145 | (CHECK_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER) ? "accept" : ""), | |
146 | peer->host, peer->fd, from_peer->fd); | |
147 | bgp_stop(peer); | |
148 | bgp_stop(from_peer); | |
149 | return NULL; | |
150 | } | |
151 | if (from_peer->status > Active) | |
152 | { | |
153 | if (bgp_getsockname(from_peer) < 0) | |
154 | { | |
155 | zlog_err ("%%bgp_getsockname() failed for %s from_peer %s fd %d (peer fd %d)", | |
156 | (CHECK_FLAG (from_peer->sflags, PEER_STATUS_ACCEPT_PEER) ? "accept" : ""), | |
157 | from_peer->host, from_peer->fd, peer->fd); | |
158 | bgp_stop(from_peer); | |
159 | from_peer = NULL; | |
160 | } | |
161 | } | |
162 | ||
163 | BGP_READ_ON(peer->t_read, bgp_read, peer->fd); | |
164 | BGP_WRITE_ON(peer->t_write, bgp_write, peer->fd); | |
165 | ||
166 | if (from_peer) | |
167 | peer_xfer_stats(peer, from_peer); | |
168 | ||
169 | return(peer); | |
170 | } | |
171 | ||
ca058a30 PJ |
172 | /* Check if suppress start/restart of sessions to peer. */ |
173 | #define BGP_PEER_START_SUPPRESSED(P) \ | |
174 | (CHECK_FLAG ((P)->flags, PEER_FLAG_SHUTDOWN) \ | |
175 | || CHECK_FLAG ((P)->sflags, PEER_STATUS_PREFIX_OVERFLOW)) | |
176 | ||
718e3744 | 177 | /* Hook function called after bgp event is occered. And vty's |
178 | neighbor command invoke this function after making neighbor | |
179 | structure. */ | |
180 | void | |
181 | bgp_timer_set (struct peer *peer) | |
182 | { | |
718e3744 | 183 | switch (peer->status) |
184 | { | |
185 | case Idle: | |
186 | /* First entry point of peer's finite state machine. In Idle | |
187 | status start timer is on unless peer is shutdown or peer is | |
188 | inactive. All other timer must be turned off */ | |
ca058a30 | 189 | if (BGP_PEER_START_SUPPRESSED (peer) || ! peer_active (peer)) |
718e3744 | 190 | { |
191 | BGP_TIMER_OFF (peer->t_start); | |
192 | } | |
193 | else | |
194 | { | |
718e3744 | 195 | BGP_TIMER_ON (peer->t_start, bgp_start_timer, |
5ca5f1c8 | 196 | peer->v_start); |
718e3744 | 197 | } |
198 | BGP_TIMER_OFF (peer->t_connect); | |
199 | BGP_TIMER_OFF (peer->t_holdtime); | |
200 | BGP_TIMER_OFF (peer->t_keepalive); | |
201 | BGP_TIMER_OFF (peer->t_asorig); | |
202 | BGP_TIMER_OFF (peer->t_routeadv); | |
203 | break; | |
204 | ||
205 | case Connect: | |
5ca5f1c8 | 206 | /* After start timer is expired, the peer moves to Connect |
718e3744 | 207 | status. Make sure start timer is off and connect timer is |
208 | on. */ | |
209 | BGP_TIMER_OFF (peer->t_start); | |
210 | BGP_TIMER_ON (peer->t_connect, bgp_connect_timer, peer->v_connect); | |
211 | BGP_TIMER_OFF (peer->t_holdtime); | |
212 | BGP_TIMER_OFF (peer->t_keepalive); | |
213 | BGP_TIMER_OFF (peer->t_asorig); | |
214 | BGP_TIMER_OFF (peer->t_routeadv); | |
215 | break; | |
216 | ||
217 | case Active: | |
218 | /* Active is waiting connection from remote peer. And if | |
219 | connect timer is expired, change status to Connect. */ | |
220 | BGP_TIMER_OFF (peer->t_start); | |
221 | /* If peer is passive mode, do not set connect timer. */ | |
93406d87 | 222 | if (CHECK_FLAG (peer->flags, PEER_FLAG_PASSIVE) |
223 | || CHECK_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT)) | |
718e3744 | 224 | { |
225 | BGP_TIMER_OFF (peer->t_connect); | |
226 | } | |
227 | else | |
228 | { | |
229 | BGP_TIMER_ON (peer->t_connect, bgp_connect_timer, peer->v_connect); | |
230 | } | |
231 | BGP_TIMER_OFF (peer->t_holdtime); | |
232 | BGP_TIMER_OFF (peer->t_keepalive); | |
233 | BGP_TIMER_OFF (peer->t_asorig); | |
234 | BGP_TIMER_OFF (peer->t_routeadv); | |
235 | break; | |
236 | ||
237 | case OpenSent: | |
238 | /* OpenSent status. */ | |
239 | BGP_TIMER_OFF (peer->t_start); | |
240 | BGP_TIMER_OFF (peer->t_connect); | |
241 | if (peer->v_holdtime != 0) | |
242 | { | |
243 | BGP_TIMER_ON (peer->t_holdtime, bgp_holdtime_timer, | |
244 | peer->v_holdtime); | |
245 | } | |
246 | else | |
247 | { | |
248 | BGP_TIMER_OFF (peer->t_holdtime); | |
249 | } | |
250 | BGP_TIMER_OFF (peer->t_keepalive); | |
251 | BGP_TIMER_OFF (peer->t_asorig); | |
252 | BGP_TIMER_OFF (peer->t_routeadv); | |
253 | break; | |
254 | ||
255 | case OpenConfirm: | |
256 | /* OpenConfirm status. */ | |
257 | BGP_TIMER_OFF (peer->t_start); | |
258 | BGP_TIMER_OFF (peer->t_connect); | |
259 | ||
260 | /* If the negotiated Hold Time value is zero, then the Hold Time | |
261 | timer and KeepAlive timers are not started. */ | |
262 | if (peer->v_holdtime == 0) | |
263 | { | |
264 | BGP_TIMER_OFF (peer->t_holdtime); | |
265 | BGP_TIMER_OFF (peer->t_keepalive); | |
266 | } | |
267 | else | |
268 | { | |
269 | BGP_TIMER_ON (peer->t_holdtime, bgp_holdtime_timer, | |
270 | peer->v_holdtime); | |
271 | BGP_TIMER_ON (peer->t_keepalive, bgp_keepalive_timer, | |
272 | peer->v_keepalive); | |
273 | } | |
274 | BGP_TIMER_OFF (peer->t_asorig); | |
275 | BGP_TIMER_OFF (peer->t_routeadv); | |
276 | break; | |
277 | ||
278 | case Established: | |
279 | /* In Established status start and connect timer is turned | |
280 | off. */ | |
281 | BGP_TIMER_OFF (peer->t_start); | |
282 | BGP_TIMER_OFF (peer->t_connect); | |
283 | ||
284 | /* Same as OpenConfirm, if holdtime is zero then both holdtime | |
285 | and keepalive must be turned off. */ | |
286 | if (peer->v_holdtime == 0) | |
287 | { | |
288 | BGP_TIMER_OFF (peer->t_holdtime); | |
289 | BGP_TIMER_OFF (peer->t_keepalive); | |
290 | } | |
291 | else | |
292 | { | |
293 | BGP_TIMER_ON (peer->t_holdtime, bgp_holdtime_timer, | |
294 | peer->v_holdtime); | |
295 | BGP_TIMER_ON (peer->t_keepalive, bgp_keepalive_timer, | |
296 | peer->v_keepalive); | |
297 | } | |
298 | BGP_TIMER_OFF (peer->t_asorig); | |
299 | break; | |
ca058a30 PJ |
300 | case Deleted: |
301 | BGP_TIMER_OFF (peer->t_gr_restart); | |
302 | BGP_TIMER_OFF (peer->t_gr_stale); | |
303 | BGP_TIMER_OFF (peer->t_pmax_restart); | |
304 | case Clearing: | |
305 | BGP_TIMER_OFF (peer->t_start); | |
306 | BGP_TIMER_OFF (peer->t_connect); | |
307 | BGP_TIMER_OFF (peer->t_holdtime); | |
308 | BGP_TIMER_OFF (peer->t_keepalive); | |
309 | BGP_TIMER_OFF (peer->t_asorig); | |
310 | BGP_TIMER_OFF (peer->t_routeadv); | |
1ff9a340 | 311 | break; |
718e3744 | 312 | } |
313 | } | |
314 | ||
315 | /* BGP start timer. This function set BGP_Start event to thread value | |
316 | and process event. */ | |
317 | static int | |
318 | bgp_start_timer (struct thread *thread) | |
319 | { | |
320 | struct peer *peer; | |
321 | ||
322 | peer = THREAD_ARG (thread); | |
323 | peer->t_start = NULL; | |
324 | ||
16286195 DS |
325 | if (bgp_debug_neighbor_events(peer)) |
326 | zlog_debug("%s [FSM] Timer (start timer expire).", peer->host); | |
718e3744 | 327 | |
328 | THREAD_VAL (thread) = BGP_Start; | |
200df115 | 329 | bgp_event (thread); /* bgp_event unlocks peer */ |
718e3744 | 330 | |
331 | return 0; | |
332 | } | |
333 | ||
334 | /* BGP connect retry timer. */ | |
335 | static int | |
336 | bgp_connect_timer (struct thread *thread) | |
337 | { | |
338 | struct peer *peer; | |
1ff9a340 | 339 | int ret; |
718e3744 | 340 | |
341 | peer = THREAD_ARG (thread); | |
342 | peer->t_connect = NULL; | |
343 | ||
16286195 DS |
344 | if (bgp_debug_neighbor_events(peer)) |
345 | zlog_debug("%s [FSM] Timer (connect timer expire)", peer->host); | |
718e3744 | 346 | |
1ff9a340 DS |
347 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
348 | { | |
349 | bgp_stop(peer); | |
350 | ret = -1; | |
351 | } | |
352 | else | |
353 | { | |
354 | THREAD_VAL (thread) = ConnectRetry_timer_expired; | |
355 | bgp_event (thread); /* bgp_event unlocks peer */ | |
356 | ret = 0; | |
357 | } | |
718e3744 | 358 | |
1ff9a340 | 359 | return ret; |
718e3744 | 360 | } |
361 | ||
362 | /* BGP holdtime timer. */ | |
363 | static int | |
364 | bgp_holdtime_timer (struct thread *thread) | |
365 | { | |
366 | struct peer *peer; | |
367 | ||
368 | peer = THREAD_ARG (thread); | |
369 | peer->t_holdtime = NULL; | |
370 | ||
16286195 DS |
371 | if (bgp_debug_neighbor_events(peer)) |
372 | zlog_debug ("%s [FSM] Timer (holdtime timer expire)", peer->host); | |
718e3744 | 373 | |
374 | THREAD_VAL (thread) = Hold_Timer_expired; | |
200df115 | 375 | bgp_event (thread); /* bgp_event unlocks peer */ |
718e3744 | 376 | |
377 | return 0; | |
378 | } | |
379 | ||
380 | /* BGP keepalive fire ! */ | |
381 | static int | |
382 | bgp_keepalive_timer (struct thread *thread) | |
383 | { | |
384 | struct peer *peer; | |
385 | ||
386 | peer = THREAD_ARG (thread); | |
387 | peer->t_keepalive = NULL; | |
388 | ||
16286195 DS |
389 | if (bgp_debug_neighbor_events(peer)) |
390 | zlog_debug ("%s [FSM] Timer (keepalive timer expire)", peer->host); | |
718e3744 | 391 | |
392 | THREAD_VAL (thread) = KeepAlive_timer_expired; | |
200df115 | 393 | bgp_event (thread); /* bgp_event unlocks peer */ |
718e3744 | 394 | |
395 | return 0; | |
396 | } | |
397 | ||
cb1faec9 DS |
398 | static int |
399 | bgp_routeq_empty (struct peer *peer) | |
400 | { | |
3f9c7369 DS |
401 | struct peer_af *paf; |
402 | int af; | |
cb1faec9 | 403 | |
3f9c7369 DS |
404 | PEERAF_FOREACH(peer, paf, af) |
405 | { | |
406 | if (!PAF_SUBGRP(paf)) | |
407 | continue; | |
408 | if (!advertise_list_is_empty(PAF_SUBGRP(paf))) | |
409 | return 0; | |
410 | } | |
cb1faec9 DS |
411 | return 1; |
412 | } | |
413 | ||
3f9c7369 | 414 | int |
718e3744 | 415 | bgp_routeadv_timer (struct thread *thread) |
416 | { | |
417 | struct peer *peer; | |
418 | ||
419 | peer = THREAD_ARG (thread); | |
420 | peer->t_routeadv = NULL; | |
421 | ||
16286195 DS |
422 | if (bgp_debug_neighbor_events(peer)) |
423 | zlog_debug ("%s [FSM] Timer (routeadv timer expire)", peer->host); | |
718e3744 | 424 | |
65957886 | 425 | peer->synctime = bgp_clock (); |
718e3744 | 426 | |
eb821189 | 427 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
718e3744 | 428 | |
3f9c7369 DS |
429 | /* MRAI timer will be started again when FIFO is built, no need to |
430 | * do it here. | |
cb1faec9 | 431 | */ |
718e3744 | 432 | return 0; |
433 | } | |
434 | ||
e0701b79 | 435 | /* BGP Peer Down Cause */ |
fd79ac91 | 436 | const char *peer_down_str[] = |
e0701b79 | 437 | { |
438 | "", | |
439 | "Router ID changed", | |
440 | "Remote AS changed", | |
441 | "Local AS change", | |
442 | "Cluster ID changed", | |
443 | "Confederation identifier changed", | |
444 | "Confederation peer changed", | |
445 | "RR client config change", | |
446 | "RS client config change", | |
447 | "Update source change", | |
448 | "Address family activated", | |
449 | "Admin. shutdown", | |
450 | "User reset", | |
451 | "BGP Notification received", | |
452 | "BGP Notification send", | |
453 | "Peer closed the session", | |
454 | "Neighbor deleted", | |
455 | "Peer-group add member", | |
456 | "Peer-group delete member", | |
457 | "Capability changed", | |
458 | "Passive config change", | |
93406d87 | 459 | "Multihop config change", |
460 | "NSF peer closed the session" | |
e0701b79 | 461 | }; |
462 | ||
94f2b392 | 463 | static int |
93406d87 | 464 | bgp_graceful_restart_timer_expire (struct thread *thread) |
465 | { | |
466 | struct peer *peer; | |
467 | afi_t afi; | |
468 | safi_t safi; | |
469 | ||
470 | peer = THREAD_ARG (thread); | |
471 | peer->t_gr_restart = NULL; | |
472 | ||
473 | /* NSF delete stale route */ | |
474 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
0a28130d | 475 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_3 ; safi++) |
93406d87 | 476 | if (peer->nsf[afi][safi]) |
477 | bgp_clear_stale_route (peer, afi, safi); | |
478 | ||
479 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT); | |
480 | BGP_TIMER_OFF (peer->t_gr_stale); | |
481 | ||
16286195 | 482 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 483 | { |
484 | zlog_debug ("%s graceful restart timer expired", peer->host); | |
485 | zlog_debug ("%s graceful restart stalepath timer stopped", peer->host); | |
486 | } | |
487 | ||
488 | bgp_timer_set (peer); | |
489 | ||
490 | return 0; | |
491 | } | |
492 | ||
94f2b392 | 493 | static int |
93406d87 | 494 | bgp_graceful_stale_timer_expire (struct thread *thread) |
495 | { | |
496 | struct peer *peer; | |
497 | afi_t afi; | |
498 | safi_t safi; | |
499 | ||
500 | peer = THREAD_ARG (thread); | |
501 | peer->t_gr_stale = NULL; | |
502 | ||
16286195 | 503 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 504 | zlog_debug ("%s graceful restart stalepath timer expired", peer->host); |
505 | ||
506 | /* NSF delete stale route */ | |
507 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
0a28130d | 508 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_3 ; safi++) |
93406d87 | 509 | if (peer->nsf[afi][safi]) |
510 | bgp_clear_stale_route (peer, afi, safi); | |
511 | ||
512 | return 0; | |
513 | } | |
514 | ||
f188f2c4 DS |
515 | static int |
516 | bgp_update_delay_applicable (struct bgp *bgp) | |
517 | { | |
518 | /* update_delay_over flag should be reset (set to 0) for any new | |
519 | applicability of the update-delay during BGP process lifetime. | |
520 | And it should be set after an occurence of the update-delay is over)*/ | |
521 | if (!bgp->update_delay_over) | |
522 | return 1; | |
523 | ||
524 | return 0; | |
525 | } | |
526 | ||
527 | int | |
528 | bgp_update_delay_active (struct bgp *bgp) | |
529 | { | |
530 | if (bgp->t_update_delay) | |
531 | return 1; | |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
536 | int | |
537 | bgp_update_delay_configured (struct bgp *bgp) | |
538 | { | |
539 | if (bgp->v_update_delay) | |
540 | return 1; | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
545 | /* Do the post-processing needed when bgp comes out of the read-only mode | |
546 | on ending the update delay. */ | |
547 | void | |
548 | bgp_update_delay_end (struct bgp *bgp) | |
549 | { | |
f188f2c4 DS |
550 | THREAD_TIMER_OFF (bgp->t_update_delay); |
551 | THREAD_TIMER_OFF (bgp->t_establish_wait); | |
552 | ||
553 | /* Reset update-delay related state */ | |
554 | bgp->update_delay_over = 1; | |
555 | bgp->established = 0; | |
556 | bgp->restarted_peers = 0; | |
557 | bgp->implicit_eors = 0; | |
558 | bgp->explicit_eors = 0; | |
559 | ||
560 | quagga_timestamp(3, bgp->update_delay_end_time, | |
561 | sizeof(bgp->update_delay_end_time)); | |
562 | ||
cb1faec9 DS |
563 | /* |
564 | * Add an end-of-initial-update marker to the main process queues so that | |
4a16ae86 DS |
565 | * the route advertisement timer for the peers can be started. Also set |
566 | * the zebra and peer update hold flags. These flags are used to achieve | |
567 | * three stages in the update-delay post processing: | |
568 | * 1. Finish best-path selection for all the prefixes held on the queues. | |
569 | * (routes in BGP are updated, and peers sync queues are populated too) | |
570 | * 2. As the eoiu mark is reached in the bgp process routine, ship all the | |
571 | * routes to zebra. With that zebra should see updates from BGP close | |
572 | * to each other. | |
573 | * 3. Unblock the peer update writes. With that peer update packing with | |
574 | * the prefixes should be at its maximum. | |
cb1faec9 DS |
575 | */ |
576 | bgp_add_eoiu_mark(bgp, BGP_TABLE_MAIN); | |
577 | bgp_add_eoiu_mark(bgp, BGP_TABLE_RSCLIENT); | |
4a16ae86 DS |
578 | bgp->main_zebra_update_hold = 1; |
579 | bgp->main_peers_update_hold = 1; | |
580 | bgp->rsclient_peers_update_hold = 1; | |
f188f2c4 DS |
581 | |
582 | /* Resume the queue processing. This should trigger the event that would take | |
583 | care of processing any work that was queued during the read-only mode. */ | |
584 | work_queue_unplug(bm->process_main_queue); | |
585 | work_queue_unplug(bm->process_rsclient_queue); | |
586 | } | |
587 | ||
cb1faec9 DS |
588 | /** |
589 | * see bgp_fsm.h | |
590 | */ | |
591 | void | |
592 | bgp_start_routeadv (struct bgp *bgp) | |
593 | { | |
594 | struct listnode *node, *nnode; | |
595 | struct peer *peer; | |
596 | ||
4a16ae86 DS |
597 | zlog_info("bgp_start_routeadv(), update hold status - main: %d, rsclient: %d", |
598 | bgp->main_peers_update_hold, bgp->rsclient_peers_update_hold); | |
599 | ||
600 | if (bgp->main_peers_update_hold || bgp->rsclient_peers_update_hold) | |
601 | return; | |
602 | ||
603 | quagga_timestamp(3, bgp->update_delay_peers_resume_time, | |
604 | sizeof(bgp->update_delay_peers_resume_time)); | |
605 | ||
cb1faec9 DS |
606 | for (ALL_LIST_ELEMENTS (bgp->peer, node, nnode, peer)) |
607 | { | |
608 | if (peer->status != Established) | |
609 | continue; | |
610 | BGP_TIMER_OFF(peer->t_routeadv); | |
611 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
612 | } | |
613 | } | |
614 | ||
615 | /** | |
616 | * see bgp_fsm.h | |
617 | */ | |
618 | void | |
619 | bgp_adjust_routeadv (struct peer *peer) | |
620 | { | |
621 | time_t nowtime = bgp_clock(); | |
622 | double diff; | |
623 | unsigned long remain; | |
624 | ||
d889623f DS |
625 | /* Bypass checks for special case of MRAI being 0 */ |
626 | if (peer->v_routeadv == 0) | |
627 | { | |
628 | /* Stop existing timer, just in case it is running for a different | |
629 | * duration and schedule write thread immediately. | |
630 | */ | |
631 | if (peer->t_routeadv) | |
632 | BGP_TIMER_OFF(peer->t_routeadv); | |
633 | ||
634 | peer->synctime = bgp_clock (); | |
635 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); | |
636 | return; | |
637 | } | |
638 | ||
d889623f | 639 | |
cb1faec9 DS |
640 | /* |
641 | * CASE I: | |
642 | * If the last update was written more than MRAI back, expire the timer | |
643 | * instantly so that we can send the update out sooner. | |
644 | * | |
645 | * <------- MRAI ---------> | |
646 | * |-----------------|-----------------------| | |
647 | * <------------- m ------------> | |
648 | * ^ ^ ^ | |
649 | * | | | | |
650 | * | | current time | |
651 | * | timer start | |
652 | * last write | |
653 | * | |
654 | * m > MRAI | |
655 | */ | |
656 | diff = difftime(nowtime, peer->last_write); | |
657 | if (diff > (double) peer->v_routeadv) | |
658 | { | |
659 | BGP_TIMER_OFF(peer->t_routeadv); | |
660 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
cb1faec9 DS |
661 | return; |
662 | } | |
663 | ||
664 | /* | |
665 | * CASE II: | |
666 | * - Find when to expire the MRAI timer. | |
667 | * If MRAI timer is not active, assume we can start it now. | |
668 | * | |
669 | * <------- MRAI ---------> | |
670 | * |------------|-----------------------| | |
671 | * <-------- m ----------><----- r -----> | |
672 | * ^ ^ ^ | |
673 | * | | | | |
674 | * | | current time | |
675 | * | timer start | |
676 | * last write | |
677 | * | |
678 | * (MRAI - m) < r | |
679 | */ | |
680 | if (peer->t_routeadv) | |
681 | remain = thread_timer_remain_second(peer->t_routeadv); | |
682 | else | |
683 | remain = peer->v_routeadv; | |
684 | diff = peer->v_routeadv - diff; | |
685 | if (diff <= (double) remain) | |
686 | { | |
687 | BGP_TIMER_OFF(peer->t_routeadv); | |
688 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, diff); | |
cb1faec9 DS |
689 | } |
690 | } | |
691 | ||
abc920f8 DS |
692 | static int |
693 | bgp_maxmed_onstartup_applicable (struct bgp *bgp) | |
694 | { | |
695 | if (!bgp->maxmed_onstartup_over) | |
696 | return 1; | |
697 | ||
698 | return 0; | |
699 | } | |
700 | ||
701 | int | |
702 | bgp_maxmed_onstartup_configured (struct bgp *bgp) | |
703 | { | |
704 | if (bgp->v_maxmed_onstartup != BGP_MAXMED_ONSTARTUP_UNCONFIGURED) | |
705 | return 1; | |
706 | ||
707 | return 0; | |
708 | } | |
709 | ||
710 | int | |
711 | bgp_maxmed_onstartup_active (struct bgp *bgp) | |
712 | { | |
713 | if (bgp->t_maxmed_onstartup) | |
714 | return 1; | |
715 | ||
716 | return 0; | |
717 | } | |
718 | ||
719 | void | |
720 | bgp_maxmed_update (struct bgp *bgp) | |
721 | { | |
abc920f8 DS |
722 | u_char maxmed_active; |
723 | u_int32_t maxmed_value; | |
724 | ||
725 | if (bgp->v_maxmed_admin) | |
726 | { | |
727 | maxmed_active = 1; | |
728 | maxmed_value = bgp->maxmed_admin_value; | |
729 | } | |
730 | else if (bgp->t_maxmed_onstartup) | |
731 | { | |
732 | maxmed_active = 1; | |
733 | maxmed_value = bgp->maxmed_onstartup_value; | |
734 | } | |
735 | else | |
736 | { | |
737 | maxmed_active = 0; | |
738 | maxmed_value = BGP_MAXMED_VALUE_DEFAULT; | |
739 | } | |
740 | ||
741 | if (bgp->maxmed_active != maxmed_active || | |
742 | bgp->maxmed_value != maxmed_value) | |
743 | { | |
744 | bgp->maxmed_active = maxmed_active; | |
745 | bgp->maxmed_value = maxmed_value; | |
746 | ||
3f9c7369 | 747 | update_group_announce(bgp); |
abc920f8 DS |
748 | } |
749 | } | |
750 | ||
751 | /* The maxmed onstartup timer expiry callback. */ | |
752 | static int | |
753 | bgp_maxmed_onstartup_timer (struct thread *thread) | |
754 | { | |
755 | struct bgp *bgp; | |
756 | ||
757 | zlog_info ("Max med on startup ended - timer expired."); | |
758 | ||
759 | bgp = THREAD_ARG (thread); | |
760 | THREAD_TIMER_OFF (bgp->t_maxmed_onstartup); | |
761 | bgp->maxmed_onstartup_over = 1; | |
762 | ||
763 | bgp_maxmed_update(bgp); | |
764 | ||
765 | return 0; | |
766 | } | |
767 | ||
768 | static void | |
769 | bgp_maxmed_onstartup_begin (struct bgp *bgp) | |
770 | { | |
771 | /* Applicable only once in the process lifetime on the startup */ | |
772 | if (bgp->maxmed_onstartup_over) | |
773 | return; | |
774 | ||
775 | zlog_info ("Begin maxmed onstartup mode - timer %d seconds", | |
776 | bgp->v_maxmed_onstartup); | |
777 | ||
778 | THREAD_TIMER_ON (master, bgp->t_maxmed_onstartup, | |
779 | bgp_maxmed_onstartup_timer, | |
780 | bgp, bgp->v_maxmed_onstartup); | |
781 | ||
782 | if (!bgp->v_maxmed_admin) | |
783 | { | |
784 | bgp->maxmed_active = 1; | |
785 | bgp->maxmed_value = bgp->maxmed_onstartup_value; | |
786 | } | |
787 | ||
788 | /* Route announce to all peers should happen after this in bgp_establish() */ | |
789 | } | |
790 | ||
791 | static void | |
792 | bgp_maxmed_onstartup_process_status_change(struct peer *peer) | |
793 | { | |
794 | if (peer->status == Established && !peer->bgp->established) | |
795 | { | |
796 | bgp_maxmed_onstartup_begin(peer->bgp); | |
797 | } | |
798 | } | |
799 | ||
f188f2c4 DS |
800 | /* The update delay timer expiry callback. */ |
801 | static int | |
802 | bgp_update_delay_timer (struct thread *thread) | |
803 | { | |
804 | struct bgp *bgp; | |
805 | ||
806 | zlog_info ("Update delay ended - timer expired."); | |
807 | ||
808 | bgp = THREAD_ARG (thread); | |
809 | THREAD_TIMER_OFF (bgp->t_update_delay); | |
810 | bgp_update_delay_end(bgp); | |
811 | ||
812 | return 0; | |
813 | } | |
814 | ||
815 | /* The establish wait timer expiry callback. */ | |
816 | static int | |
817 | bgp_establish_wait_timer (struct thread *thread) | |
818 | { | |
819 | struct bgp *bgp; | |
820 | ||
821 | zlog_info ("Establish wait - timer expired."); | |
822 | ||
823 | bgp = THREAD_ARG (thread); | |
824 | THREAD_TIMER_OFF (bgp->t_establish_wait); | |
825 | bgp_check_update_delay(bgp); | |
826 | ||
827 | return 0; | |
828 | } | |
829 | ||
830 | /* Steps to begin the update delay: | |
831 | - initialize queues if needed | |
832 | - stop the queue processing | |
833 | - start the timer */ | |
834 | static void | |
835 | bgp_update_delay_begin (struct bgp *bgp) | |
836 | { | |
837 | struct listnode *node, *nnode; | |
838 | struct peer *peer; | |
839 | ||
840 | if ((bm->process_main_queue == NULL) || | |
841 | (bm->process_rsclient_queue == NULL)) | |
842 | bgp_process_queue_init(); | |
843 | ||
844 | /* Stop the processing of queued work. Enqueue shall continue */ | |
845 | work_queue_plug(bm->process_main_queue); | |
846 | work_queue_plug(bm->process_rsclient_queue); | |
847 | ||
848 | for (ALL_LIST_ELEMENTS (bgp->peer, node, nnode, peer)) | |
849 | peer->update_delay_over = 0; | |
850 | ||
851 | /* Start the update-delay timer */ | |
852 | THREAD_TIMER_ON (master, bgp->t_update_delay, bgp_update_delay_timer, | |
853 | bgp, bgp->v_update_delay); | |
854 | ||
855 | if (bgp->v_establish_wait != bgp->v_update_delay) | |
856 | THREAD_TIMER_ON (master, bgp->t_establish_wait, bgp_establish_wait_timer, | |
857 | bgp, bgp->v_establish_wait); | |
858 | ||
859 | quagga_timestamp(3, bgp->update_delay_begin_time, | |
860 | sizeof(bgp->update_delay_begin_time)); | |
861 | } | |
862 | ||
863 | static void | |
864 | bgp_update_delay_process_status_change(struct peer *peer) | |
865 | { | |
866 | if (peer->status == Established) | |
867 | { | |
868 | if (!peer->bgp->established++) | |
869 | { | |
870 | bgp_update_delay_begin(peer->bgp); | |
871 | zlog_info ("Begin read-only mode - update-delay timer %d seconds", | |
872 | peer->bgp->v_update_delay); | |
873 | } | |
874 | if (CHECK_FLAG (peer->cap, PEER_CAP_RESTART_BIT_RCV)) | |
875 | bgp_update_restarted_peers(peer); | |
876 | } | |
877 | if (peer->ostatus == Established && bgp_update_delay_active(peer->bgp)) | |
878 | { | |
879 | /* Adjust the update-delay state to account for this flap. | |
880 | NOTE: Intentionally skipping adjusting implicit_eors or explicit_eors | |
881 | counters. Extra sanity check in bgp_check_update_delay() should | |
882 | be enough to take care of any additive discrepancy in bgp eor | |
883 | counters */ | |
884 | peer->bgp->established--; | |
885 | peer->update_delay_over = 0; | |
886 | } | |
887 | } | |
888 | ||
200df115 | 889 | /* Called after event occured, this function change status and reset |
890 | read/write and timer thread. */ | |
891 | void | |
892 | bgp_fsm_change_status (struct peer *peer, int status) | |
893 | { | |
1ff9a340 | 894 | |
200df115 | 895 | bgp_dump_state (peer, peer->status, status); |
896 | ||
f2c31acb PJ |
897 | /* Transition into Clearing or Deleted must /always/ clear all routes.. |
898 | * (and must do so before actually changing into Deleted.. | |
899 | */ | |
900 | if (status >= Clearing) | |
901 | bgp_clear_route_all (peer); | |
902 | ||
200df115 | 903 | /* Preserve old status and change into new status. */ |
904 | peer->ostatus = peer->status; | |
905 | peer->status = status; | |
f188f2c4 | 906 | |
1ff9a340 DS |
907 | if (status == Established) |
908 | UNSET_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER); | |
909 | ||
abc920f8 DS |
910 | /* If max-med processing is applicable, do the necessary. */ |
911 | if (status == Established) | |
912 | { | |
913 | if (bgp_maxmed_onstartup_configured(peer->bgp) && | |
914 | bgp_maxmed_onstartup_applicable(peer->bgp)) | |
915 | bgp_maxmed_onstartup_process_status_change(peer); | |
916 | else | |
917 | peer->bgp->maxmed_onstartup_over = 1; | |
918 | } | |
919 | ||
f188f2c4 DS |
920 | /* If update-delay processing is applicable, do the necessary. */ |
921 | if (bgp_update_delay_configured(peer->bgp) && | |
922 | bgp_update_delay_applicable(peer->bgp)) | |
923 | bgp_update_delay_process_status_change(peer); | |
924 | ||
16286195 | 925 | if (bgp_debug_neighbor_events(peer)) |
200df115 | 926 | zlog_debug ("%s went from %s to %s", |
927 | peer->host, | |
928 | LOOKUP (bgp_status_msg, peer->ostatus), | |
929 | LOOKUP (bgp_status_msg, peer->status)); | |
930 | } | |
931 | ||
3117b5c4 | 932 | /* Flush the event queue and ensure the peer is shut down */ |
9e4ca89c | 933 | static int |
3117b5c4 SH |
934 | bgp_clearing_completed (struct peer *peer) |
935 | { | |
936 | int rc = bgp_stop(peer); | |
1ff9a340 DS |
937 | |
938 | if (rc >= 0) | |
939 | BGP_EVENT_FLUSH (peer); | |
3117b5c4 SH |
940 | |
941 | return rc; | |
942 | } | |
943 | ||
718e3744 | 944 | /* Administrative BGP peer stop event. */ |
3117b5c4 | 945 | /* May be called multiple times for the same peer */ |
718e3744 | 946 | int |
947 | bgp_stop (struct peer *peer) | |
948 | { | |
718e3744 | 949 | afi_t afi; |
950 | safi_t safi; | |
951 | char orf_name[BUFSIZ]; | |
1ff9a340 | 952 | int ret = 0; |
718e3744 | 953 | |
3117b5c4 SH |
954 | /* Can't do this in Clearing; events are used for state transitions */ |
955 | if (peer->status != Clearing) | |
2158ad23 PJ |
956 | { |
957 | /* Delete all existing events of the peer */ | |
958 | BGP_EVENT_FLUSH (peer); | |
959 | } | |
dcdf399f | 960 | |
718e3744 | 961 | /* Increment Dropped count. */ |
962 | if (peer->status == Established) | |
963 | { | |
718e3744 | 964 | peer->dropped++; |
848973c7 | 965 | |
966 | /* bgp log-neighbor-changes of neighbor Down */ | |
967 | if (bgp_flag_check (peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) | |
e0701b79 | 968 | zlog_info ("%%ADJCHANGE: neighbor %s Down %s", peer->host, |
969 | peer_down_str [(int) peer->last_reset]); | |
848973c7 | 970 | |
93406d87 | 971 | /* graceful restart */ |
972 | if (peer->t_gr_stale) | |
973 | { | |
974 | BGP_TIMER_OFF (peer->t_gr_stale); | |
16286195 | 975 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 976 | zlog_debug ("%s graceful restart stalepath timer stopped", peer->host); |
977 | } | |
978 | if (CHECK_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT)) | |
979 | { | |
16286195 | 980 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 981 | { |
982 | zlog_debug ("%s graceful restart timer started for %d sec", | |
983 | peer->host, peer->v_gr_restart); | |
984 | zlog_debug ("%s graceful restart stalepath timer started for %d sec", | |
985 | peer->host, peer->bgp->stalepath_time); | |
986 | } | |
987 | BGP_TIMER_ON (peer->t_gr_restart, bgp_graceful_restart_timer_expire, | |
988 | peer->v_gr_restart); | |
989 | BGP_TIMER_ON (peer->t_gr_stale, bgp_graceful_stale_timer_expire, | |
990 | peer->bgp->stalepath_time); | |
991 | } | |
992 | else | |
993 | { | |
994 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_MODE); | |
995 | ||
996 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
0a28130d | 997 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_3 ; safi++) |
93406d87 | 998 | peer->nsf[afi][safi] = 0; |
999 | } | |
1000 | ||
848973c7 | 1001 | /* set last reset time */ |
65957886 | 1002 | peer->resettime = peer->uptime = bgp_clock (); |
848973c7 | 1003 | |
3f9c7369 DS |
1004 | if (BGP_DEBUG (update_groups, UPDATE_GROUPS)) |
1005 | zlog_debug ("%s remove from all update group", peer->host); | |
1006 | update_group_remove_peer_afs(peer); | |
1007 | ||
718e3744 | 1008 | #ifdef HAVE_SNMP |
1009 | bgpTrapBackwardTransition (peer); | |
1010 | #endif /* HAVE_SNMP */ | |
718e3744 | 1011 | |
f418446b | 1012 | /* Reset peer synctime */ |
1013 | peer->synctime = 0; | |
538621f2 | 1014 | } |
718e3744 | 1015 | |
1016 | /* Stop read and write threads when exists. */ | |
1017 | BGP_READ_OFF (peer->t_read); | |
1018 | BGP_WRITE_OFF (peer->t_write); | |
1019 | ||
1020 | /* Stop all timers. */ | |
1021 | BGP_TIMER_OFF (peer->t_start); | |
1022 | BGP_TIMER_OFF (peer->t_connect); | |
1023 | BGP_TIMER_OFF (peer->t_holdtime); | |
1024 | BGP_TIMER_OFF (peer->t_keepalive); | |
1025 | BGP_TIMER_OFF (peer->t_asorig); | |
1026 | BGP_TIMER_OFF (peer->t_routeadv); | |
1027 | ||
718e3744 | 1028 | /* Stream reset. */ |
1029 | peer->packet_size = 0; | |
1030 | ||
1031 | /* Clear input and output buffer. */ | |
1032 | if (peer->ibuf) | |
1033 | stream_reset (peer->ibuf); | |
1034 | if (peer->work) | |
1035 | stream_reset (peer->work); | |
200df115 | 1036 | if (peer->obuf) |
1037 | stream_fifo_clean (peer->obuf); | |
718e3744 | 1038 | |
eb821189 | 1039 | /* Close of file descriptor. */ |
1040 | if (peer->fd >= 0) | |
1041 | { | |
1042 | close (peer->fd); | |
1043 | peer->fd = -1; | |
1044 | } | |
718e3744 | 1045 | |
718e3744 | 1046 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) |
1047 | for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++) | |
1048 | { | |
538621f2 | 1049 | /* Reset all negotiated variables */ |
1050 | peer->afc_nego[afi][safi] = 0; | |
1051 | peer->afc_adv[afi][safi] = 0; | |
1052 | peer->afc_recv[afi][safi] = 0; | |
1053 | ||
718e3744 | 1054 | /* peer address family capability flags*/ |
1055 | peer->af_cap[afi][safi] = 0; | |
538621f2 | 1056 | |
718e3744 | 1057 | /* peer address family status flags*/ |
1058 | peer->af_sflags[afi][safi] = 0; | |
538621f2 | 1059 | |
718e3744 | 1060 | /* Received ORF prefix-filter */ |
1061 | peer->orf_plist[afi][safi] = NULL; | |
538621f2 | 1062 | |
1ff9a340 DS |
1063 | if ((peer->status == OpenConfirm) || (peer->status == Established)) { |
1064 | /* ORF received prefix-filter pnt */ | |
1065 | sprintf (orf_name, "%s.%d.%d", peer->host, afi, safi); | |
1066 | prefix_bgp_orf_remove_all (orf_name); | |
1067 | } | |
718e3744 | 1068 | } |
1069 | ||
1070 | /* Reset keepalive and holdtime */ | |
1071 | if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER)) | |
1072 | { | |
1073 | peer->v_keepalive = peer->keepalive; | |
1074 | peer->v_holdtime = peer->holdtime; | |
1075 | } | |
1076 | else | |
1077 | { | |
1078 | peer->v_keepalive = peer->bgp->default_keepalive; | |
1079 | peer->v_holdtime = peer->bgp->default_holdtime; | |
1080 | } | |
1081 | ||
1082 | peer->update_time = 0; | |
1083 | ||
1084 | /* Until we are sure that there is no problem about prefix count | |
1085 | this should be commented out.*/ | |
1086 | #if 0 | |
1087 | /* Reset prefix count */ | |
1088 | peer->pcount[AFI_IP][SAFI_UNICAST] = 0; | |
1089 | peer->pcount[AFI_IP][SAFI_MULTICAST] = 0; | |
1090 | peer->pcount[AFI_IP][SAFI_MPLS_VPN] = 0; | |
1091 | peer->pcount[AFI_IP6][SAFI_UNICAST] = 0; | |
1092 | peer->pcount[AFI_IP6][SAFI_MULTICAST] = 0; | |
1093 | #endif /* 0 */ | |
1094 | ||
1ff9a340 DS |
1095 | if (!CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE) && |
1096 | !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) | |
1097 | { | |
1098 | peer_delete(peer); | |
1099 | ret = -1; | |
1100 | } | |
a80beece DS |
1101 | else |
1102 | { | |
1103 | bgp_peer_conf_if_to_su_update(peer); | |
1104 | } | |
1ff9a340 DS |
1105 | |
1106 | return ret; | |
718e3744 | 1107 | } |
1108 | ||
1109 | /* BGP peer is stoped by the error. */ | |
94f2b392 | 1110 | static int |
718e3744 | 1111 | bgp_stop_with_error (struct peer *peer) |
1112 | { | |
1113 | /* Double start timer. */ | |
1114 | peer->v_start *= 2; | |
1115 | ||
1116 | /* Overflow check. */ | |
1117 | if (peer->v_start >= (60 * 2)) | |
1118 | peer->v_start = (60 * 2); | |
1119 | ||
1ff9a340 | 1120 | return(bgp_stop (peer)); |
718e3744 | 1121 | } |
1122 | ||
397b5bde LR |
1123 | |
1124 | /* something went wrong, send notify and tear down */ | |
1125 | static int | |
1126 | bgp_stop_with_notify (struct peer *peer, u_char code, u_char sub_code) | |
1127 | { | |
1128 | /* Send notify to remote peer */ | |
1129 | bgp_notify_send (peer, code, sub_code); | |
1130 | ||
397b5bde LR |
1131 | /* Clear start timer value to default. */ |
1132 | peer->v_start = BGP_INIT_START_TIMER; | |
1133 | ||
1ff9a340 | 1134 | return(bgp_stop(peer)); |
397b5bde LR |
1135 | } |
1136 | ||
1137 | ||
718e3744 | 1138 | /* TCP connection open. Next we send open message to remote peer. And |
1139 | add read thread for reading open message. */ | |
94f2b392 | 1140 | static int |
718e3744 | 1141 | bgp_connect_success (struct peer *peer) |
1142 | { | |
1ff9a340 DS |
1143 | int ret = 0; |
1144 | ||
eb821189 | 1145 | if (peer->fd < 0) |
718e3744 | 1146 | { |
1147 | zlog_err ("bgp_connect_success peer's fd is negative value %d", | |
eb821189 | 1148 | peer->fd); |
1ff9a340 | 1149 | bgp_stop(peer); |
718e3744 | 1150 | return -1; |
1151 | } | |
718e3744 | 1152 | |
1ff9a340 DS |
1153 | if (bgp_getsockname (peer) < 0) |
1154 | { | |
1155 | zlog_err ("%s: bgp_getsockname(): failed for peer %s", __FUNCTION__, | |
1156 | peer->host); | |
1157 | bgp_notify_send(peer, BGP_NOTIFY_FSM_ERR, 0); /* internal error */ | |
1158 | return -1; | |
1159 | } | |
1160 | ||
1161 | BGP_READ_ON (peer->t_read, bgp_read, peer->fd); | |
f418446b | 1162 | |
16286195 | 1163 | if (bgp_debug_neighbor_events(peer)) |
f418446b | 1164 | { |
682ca04c JBD |
1165 | char buf1[SU_ADDRSTRLEN]; |
1166 | ||
f418446b | 1167 | if (! CHECK_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
1168 | zlog_debug ("%s open active, local address %s", peer->host, | |
1169 | sockunion2str (peer->su_local, buf1, SU_ADDRSTRLEN)); | |
1170 | else | |
1171 | zlog_debug ("%s passive open", peer->host); | |
1172 | } | |
718e3744 | 1173 | |
1ff9a340 | 1174 | bgp_open_send (peer); |
718e3744 | 1175 | |
1176 | return 0; | |
1177 | } | |
1178 | ||
1179 | /* TCP connect fail */ | |
94f2b392 | 1180 | static int |
718e3744 | 1181 | bgp_connect_fail (struct peer *peer) |
1182 | { | |
1ff9a340 | 1183 | return (bgp_stop (peer)); |
718e3744 | 1184 | } |
1185 | ||
1186 | /* This function is the first starting point of all BGP connection. It | |
1187 | try to connect to remote peer with non-blocking IO. */ | |
1188 | int | |
1189 | bgp_start (struct peer *peer) | |
1190 | { | |
1191 | int status; | |
fc9a856f | 1192 | int connected = 0; |
718e3744 | 1193 | |
a80beece DS |
1194 | bgp_peer_conf_if_to_su_update(peer); |
1195 | ||
ca058a30 PJ |
1196 | if (BGP_PEER_START_SUPPRESSED (peer)) |
1197 | { | |
16286195 DS |
1198 | if (bgp_debug_neighbor_events(peer)) |
1199 | zlog_err ("%s [FSM] Trying to start suppressed peer" | |
ca058a30 PJ |
1200 | " - this is never supposed to happen!", peer->host); |
1201 | return -1; | |
1202 | } | |
1203 | ||
33d5ab9e PJ |
1204 | /* Scrub some information that might be left over from a previous, |
1205 | * session | |
1206 | */ | |
1207 | /* Connection information. */ | |
1208 | if (peer->su_local) | |
1209 | { | |
1210 | sockunion_free (peer->su_local); | |
1211 | peer->su_local = NULL; | |
1212 | } | |
1213 | ||
1214 | if (peer->su_remote) | |
1215 | { | |
1216 | sockunion_free (peer->su_remote); | |
1217 | peer->su_remote = NULL; | |
1218 | } | |
1219 | ||
1220 | /* Clear remote router-id. */ | |
1221 | peer->remote_id.s_addr = 0; | |
1222 | ||
1223 | /* Clear peer capability flag. */ | |
1224 | peer->cap = 0; | |
1225 | ||
718e3744 | 1226 | /* If the peer is passive mode, force to move to Active mode. */ |
1227 | if (CHECK_FLAG (peer->flags, PEER_FLAG_PASSIVE)) | |
1228 | { | |
1229 | BGP_EVENT_ADD (peer, TCP_connection_open_failed); | |
1230 | return 0; | |
1231 | } | |
1232 | ||
fc9a856f DS |
1233 | /* Register to be notified on peer up */ |
1234 | if ((peer->ttl == 1) || (peer->gtsm_hops == 1)) | |
1235 | connected = 1; | |
1236 | ||
1237 | bgp_find_or_add_nexthop(family2afi(peer->su.sa.sa_family), NULL, peer, | |
1238 | connected); | |
718e3744 | 1239 | status = bgp_connect (peer); |
1240 | ||
1241 | switch (status) | |
1242 | { | |
1243 | case connect_error: | |
16286195 DS |
1244 | if (bgp_debug_neighbor_events(peer)) |
1245 | zlog_debug ("%s [FSM] Connect error", peer->host); | |
718e3744 | 1246 | BGP_EVENT_ADD (peer, TCP_connection_open_failed); |
1247 | break; | |
1248 | case connect_success: | |
16286195 DS |
1249 | if (bgp_debug_neighbor_events(peer)) |
1250 | zlog_debug ("%s [FSM] Connect immediately success", | |
eb821189 | 1251 | peer->host); |
718e3744 | 1252 | BGP_EVENT_ADD (peer, TCP_connection_open); |
1253 | break; | |
1254 | case connect_in_progress: | |
1255 | /* To check nonblocking connect, we wait until socket is | |
1256 | readable or writable. */ | |
16286195 DS |
1257 | if (bgp_debug_neighbor_events(peer)) |
1258 | zlog_debug ("%s [FSM] Non blocking connect waiting result", | |
eb821189 | 1259 | peer->host); |
1260 | if (peer->fd < 0) | |
718e3744 | 1261 | { |
1262 | zlog_err ("bgp_start peer's fd is negative value %d", | |
eb821189 | 1263 | peer->fd); |
718e3744 | 1264 | return -1; |
1265 | } | |
eb821189 | 1266 | BGP_READ_ON (peer->t_read, bgp_read, peer->fd); |
1267 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); | |
718e3744 | 1268 | break; |
1269 | } | |
1270 | return 0; | |
1271 | } | |
1272 | ||
1273 | /* Connect retry timer is expired when the peer status is Connect. */ | |
94f2b392 | 1274 | static int |
718e3744 | 1275 | bgp_reconnect (struct peer *peer) |
1276 | { | |
1ff9a340 DS |
1277 | int ret = 0; |
1278 | ||
1279 | if (bgp_stop (peer) > 0) | |
1280 | bgp_start (peer); | |
1281 | else | |
1282 | ret = -1; | |
1283 | ||
1284 | return ret; | |
718e3744 | 1285 | } |
1286 | ||
94f2b392 | 1287 | static int |
718e3744 | 1288 | bgp_fsm_open (struct peer *peer) |
1289 | { | |
1290 | /* Send keepalive and make keepalive timer */ | |
1291 | bgp_keepalive_send (peer); | |
1292 | ||
1293 | /* Reset holdtimer value. */ | |
1294 | BGP_TIMER_OFF (peer->t_holdtime); | |
1295 | ||
1296 | return 0; | |
1297 | } | |
1298 | ||
718e3744 | 1299 | /* Keepalive send to peer. */ |
94f2b392 | 1300 | static int |
718e3744 | 1301 | bgp_fsm_keepalive_expire (struct peer *peer) |
1302 | { | |
cb1faec9 DS |
1303 | /* |
1304 | * If there are UPDATE messages to send, no need to send keepalive. The | |
1305 | * peer will note our progress through the UPDATEs. | |
1306 | */ | |
1307 | if (!bgp_routeq_empty(peer)) | |
1308 | return 0; | |
f188f2c4 | 1309 | |
718e3744 | 1310 | bgp_keepalive_send (peer); |
1311 | return 0; | |
1312 | } | |
1313 | ||
397b5bde LR |
1314 | /* FSM error, unexpected event. This is error of BGP connection. So cut the |
1315 | peer and change to Idle status. */ | |
1316 | static int | |
1317 | bgp_fsm_event_error (struct peer *peer) | |
1318 | { | |
16286195 | 1319 | zlog_err ("%s [FSM] unexpected packet received in state %s", |
397b5bde LR |
1320 | peer->host, LOOKUP (bgp_status_msg, peer->status)); |
1321 | ||
1322 | return bgp_stop_with_notify (peer, BGP_NOTIFY_FSM_ERR, 0); | |
1323 | } | |
1324 | ||
718e3744 | 1325 | /* Hold timer expire. This is error of BGP connection. So cut the |
1326 | peer and change to Idle status. */ | |
94f2b392 | 1327 | static int |
718e3744 | 1328 | bgp_fsm_holdtime_expire (struct peer *peer) |
1329 | { | |
16286195 DS |
1330 | if (bgp_debug_neighbor_events(peer)) |
1331 | zlog_debug ("%s [FSM] Hold timer expire", peer->host); | |
718e3744 | 1332 | |
397b5bde | 1333 | return bgp_stop_with_notify (peer, BGP_NOTIFY_HOLD_ERR, 0); |
718e3744 | 1334 | } |
1335 | ||
1336 | /* Status goes to Established. Send keepalive packet then make first | |
1337 | update information. */ | |
94f2b392 | 1338 | static int |
718e3744 | 1339 | bgp_establish (struct peer *peer) |
1340 | { | |
1341 | struct bgp_notify *notify; | |
3f9c7369 | 1342 | struct peer_af *paf; |
718e3744 | 1343 | afi_t afi; |
1344 | safi_t safi; | |
93406d87 | 1345 | int nsf_af_count = 0; |
1ff9a340 DS |
1346 | int ret = 0; |
1347 | struct peer *other; | |
1348 | ||
1349 | other = peer->doppelganger; | |
1350 | peer = peer_xfer_conn(peer); | |
1351 | if (!peer) | |
1352 | { | |
1353 | zlog_err ("%%Neighbor failed in xfer_conn"); | |
1354 | return -1; | |
1355 | } | |
1356 | ||
1357 | if (other == peer) | |
1358 | ret = 1; /* bgp_establish specific code when xfer_conn happens. */ | |
718e3744 | 1359 | |
1360 | /* Reset capability open status flag. */ | |
1361 | if (! CHECK_FLAG (peer->sflags, PEER_STATUS_CAPABILITY_OPEN)) | |
1362 | SET_FLAG (peer->sflags, PEER_STATUS_CAPABILITY_OPEN); | |
1363 | ||
1364 | /* Clear last notification data. */ | |
1365 | notify = &peer->notify; | |
1366 | if (notify->data) | |
1367 | XFREE (MTYPE_TMP, notify->data); | |
1368 | memset (notify, 0, sizeof (struct bgp_notify)); | |
1369 | ||
1370 | /* Clear start timer value to default. */ | |
1371 | peer->v_start = BGP_INIT_START_TIMER; | |
1372 | ||
1373 | /* Increment established count. */ | |
1374 | peer->established++; | |
1375 | bgp_fsm_change_status (peer, Established); | |
848973c7 | 1376 | |
1377 | /* bgp log-neighbor-changes of neighbor Up */ | |
1378 | if (bgp_flag_check (peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) | |
1379 | zlog_info ("%%ADJCHANGE: neighbor %s Up", peer->host); | |
1380 | ||
3f9c7369 DS |
1381 | /* assign update-group/subgroup */ |
1382 | update_group_adjust_peer_afs(peer); | |
1383 | ||
93406d87 | 1384 | /* graceful restart */ |
1385 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT); | |
1386 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
0a28130d | 1387 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_3 ; safi++) |
93406d87 | 1388 | { |
1389 | if (peer->afc_nego[afi][safi] | |
1390 | && CHECK_FLAG (peer->cap, PEER_CAP_RESTART_ADV) | |
1391 | && CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_RESTART_AF_RCV)) | |
1392 | { | |
1393 | if (peer->nsf[afi][safi] | |
1394 | && ! CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_RESTART_AF_PRESERVE_RCV)) | |
1395 | bgp_clear_stale_route (peer, afi, safi); | |
1396 | ||
1397 | peer->nsf[afi][safi] = 1; | |
1398 | nsf_af_count++; | |
1399 | } | |
1400 | else | |
1401 | { | |
1402 | if (peer->nsf[afi][safi]) | |
1403 | bgp_clear_stale_route (peer, afi, safi); | |
1404 | peer->nsf[afi][safi] = 0; | |
1405 | } | |
1406 | } | |
1407 | ||
1408 | if (nsf_af_count) | |
1409 | SET_FLAG (peer->sflags, PEER_STATUS_NSF_MODE); | |
1410 | else | |
1411 | { | |
1412 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_MODE); | |
1413 | if (peer->t_gr_stale) | |
1414 | { | |
1415 | BGP_TIMER_OFF (peer->t_gr_stale); | |
16286195 | 1416 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 1417 | zlog_debug ("%s graceful restart stalepath timer stopped", peer->host); |
1418 | } | |
1419 | } | |
1420 | ||
1421 | if (peer->t_gr_restart) | |
1422 | { | |
1423 | BGP_TIMER_OFF (peer->t_gr_restart); | |
16286195 | 1424 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 1425 | zlog_debug ("%s graceful restart timer stopped", peer->host); |
1426 | } | |
1427 | ||
718e3744 | 1428 | #ifdef HAVE_SNMP |
1429 | bgpTrapEstablished (peer); | |
1430 | #endif /* HAVE_SNMP */ | |
1431 | ||
1432 | /* Reset uptime, send keepalive, send current table. */ | |
65957886 | 1433 | peer->uptime = bgp_clock (); |
718e3744 | 1434 | |
1435 | /* Send route-refresh when ORF is enabled */ | |
1436 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
1437 | for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++) | |
1438 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_SM_ADV)) | |
1439 | { | |
1440 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_RM_RCV)) | |
1441 | bgp_route_refresh_send (peer, afi, safi, ORF_TYPE_PREFIX, | |
1442 | REFRESH_IMMEDIATE, 0); | |
1443 | else if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_RM_OLD_RCV)) | |
1444 | bgp_route_refresh_send (peer, afi, safi, ORF_TYPE_PREFIX_OLD, | |
1445 | REFRESH_IMMEDIATE, 0); | |
1446 | } | |
1447 | ||
718e3744 | 1448 | /* First update is deferred until ORF or ROUTE-REFRESH is received */ |
1449 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
1450 | for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++) | |
1451 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_RM_ADV)) | |
1452 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_SM_RCV) | |
1453 | || CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_SM_OLD_RCV)) | |
1454 | SET_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_ORF_WAIT_REFRESH); | |
1455 | ||
3f9c7369 | 1456 | bgp_announce_peer (peer); |
718e3744 | 1457 | |
cb1faec9 DS |
1458 | /* Start the route advertisement timer to send updates to the peer - if BGP |
1459 | * is not in read-only mode. If it is, the timer will be started at the end | |
1460 | * of read-only mode. | |
1461 | */ | |
1462 | if (!bgp_update_delay_active(peer->bgp)) | |
3f9c7369 DS |
1463 | { |
1464 | BGP_TIMER_OFF(peer->t_routeadv); | |
1465 | BGP_TIMER_ON (peer->t_routeadv, bgp_routeadv_timer, 0); | |
1466 | } | |
718e3744 | 1467 | |
1ff9a340 DS |
1468 | if (peer->doppelganger && (peer->doppelganger->status != Deleted)) |
1469 | { | |
16286195 | 1470 | if (bgp_debug_neighbor_events(peer)) |
1ff9a340 DS |
1471 | zlog_debug("[Event] Deleting stub connection for peer %s", peer->host); |
1472 | ||
1473 | if (peer->doppelganger->status > Active) | |
1474 | bgp_notify_send (peer->doppelganger, BGP_NOTIFY_CEASE, | |
1475 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
1476 | else | |
1477 | peer_delete(peer->doppelganger); | |
1478 | } | |
1479 | ||
1480 | return ret; | |
718e3744 | 1481 | } |
1482 | ||
1483 | /* Keepalive packet is received. */ | |
94f2b392 | 1484 | static int |
718e3744 | 1485 | bgp_fsm_keepalive (struct peer *peer) |
1486 | { | |
f188f2c4 DS |
1487 | bgp_update_implicit_eors(peer); |
1488 | ||
718e3744 | 1489 | /* peer count update */ |
1490 | peer->keepalive_in++; | |
1491 | ||
1492 | BGP_TIMER_OFF (peer->t_holdtime); | |
1493 | return 0; | |
1494 | } | |
1495 | ||
1496 | /* Update packet is received. */ | |
94f2b392 | 1497 | static int |
718e3744 | 1498 | bgp_fsm_update (struct peer *peer) |
1499 | { | |
1500 | BGP_TIMER_OFF (peer->t_holdtime); | |
1501 | return 0; | |
1502 | } | |
1503 | ||
1504 | /* This is empty event. */ | |
94f2b392 | 1505 | static int |
718e3744 | 1506 | bgp_ignore (struct peer *peer) |
1507 | { | |
16286195 DS |
1508 | if (bgp_debug_neighbor_events(peer)) |
1509 | zlog_debug ("%s [FSM] bgp_ignore called", peer->host); | |
718e3744 | 1510 | return 0; |
1511 | } | |
6b0655a2 | 1512 | |
fc9a856f DS |
1513 | void |
1514 | bgp_fsm_nht_update(struct peer *peer, int valid) | |
1515 | { | |
1516 | int ret = 0; | |
1517 | ||
1518 | if (!peer) | |
1519 | return; | |
1520 | ||
1521 | switch (peer->status) | |
1522 | { | |
1523 | case Idle: | |
1524 | if (valid) | |
1525 | BGP_EVENT_ADD(peer, BGP_Start); | |
1526 | break; | |
1527 | case Connect: | |
1528 | ret = bgp_connect_check(peer, 0); | |
1529 | if (!ret && valid) | |
1530 | { | |
1531 | BGP_TIMER_OFF(peer->t_connect); | |
1532 | BGP_EVENT_ADD(peer, ConnectRetry_timer_expired); | |
1533 | } | |
1534 | break; | |
1535 | case Active: | |
1536 | if (valid) | |
1537 | { | |
1538 | BGP_TIMER_OFF(peer->t_connect); | |
1539 | BGP_EVENT_ADD(peer, ConnectRetry_timer_expired); | |
1540 | } | |
1541 | case OpenSent: | |
1542 | case OpenConfirm: | |
1543 | case Established: | |
1544 | case Clearing: | |
1545 | case Deleted: | |
1546 | default: | |
1547 | break; | |
1548 | } | |
1549 | } | |
1550 | ||
1551 | ||
718e3744 | 1552 | /* Finite State Machine structure */ |
fda1d3e0 | 1553 | static const struct { |
66e5cd87 | 1554 | int (*func) (struct peer *); |
718e3744 | 1555 | int next_state; |
1556 | } FSM [BGP_STATUS_MAX - 1][BGP_EVENTS_MAX - 1] = | |
1557 | { | |
1558 | { | |
1559 | /* Idle state: In Idle state, all events other than BGP_Start is | |
1560 | ignored. With BGP_Start event, finite state machine calls | |
1561 | bgp_start(). */ | |
1562 | {bgp_start, Connect}, /* BGP_Start */ | |
1563 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1564 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1565 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1566 | {bgp_ignore, Idle}, /* TCP_connection_open_failed */ | |
1567 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1568 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ | |
1569 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
1570 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
1571 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
1572 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
1573 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
1574 | {bgp_ignore, Idle}, /* Receive_NOTIFICATION_message */ | |
ca058a30 | 1575 | {bgp_ignore, Idle}, /* Clearing_Completed */ |
718e3744 | 1576 | }, |
1577 | { | |
1578 | /* Connect */ | |
1579 | {bgp_ignore, Connect}, /* BGP_Start */ | |
1580 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1581 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1582 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1583 | {bgp_connect_fail, Active}, /* TCP_connection_open_failed */ | |
1584 | {bgp_connect_fail, Idle}, /* TCP_fatal_error */ | |
1585 | {bgp_reconnect, Connect}, /* ConnectRetry_timer_expired */ | |
1586 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
1587 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
1588 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
1589 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
1590 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
1591 | {bgp_stop, Idle}, /* Receive_NOTIFICATION_message */ | |
ca058a30 | 1592 | {bgp_ignore, Idle}, /* Clearing_Completed */ |
718e3744 | 1593 | }, |
1594 | { | |
1595 | /* Active, */ | |
1596 | {bgp_ignore, Active}, /* BGP_Start */ | |
1597 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1598 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1599 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1600 | {bgp_ignore, Active}, /* TCP_connection_open_failed */ | |
1601 | {bgp_ignore, Idle}, /* TCP_fatal_error */ | |
1602 | {bgp_start, Connect}, /* ConnectRetry_timer_expired */ | |
1603 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
1604 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
1605 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
1606 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
1607 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
1608 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
ca058a30 | 1609 | {bgp_ignore, Idle}, /* Clearing_Completed */ |
718e3744 | 1610 | }, |
1611 | { | |
1612 | /* OpenSent, */ | |
1613 | {bgp_ignore, OpenSent}, /* BGP_Start */ | |
1614 | {bgp_stop, Idle}, /* BGP_Stop */ | |
536792cd | 1615 | {bgp_stop, Active}, /* TCP_connection_open */ |
718e3744 | 1616 | {bgp_stop, Active}, /* TCP_connection_closed */ |
536792cd PJ |
1617 | {bgp_stop, Active}, /* TCP_connection_open_failed */ |
1618 | {bgp_stop, Active}, /* TCP_fatal_error */ | |
718e3744 | 1619 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ |
1620 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
1621 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
1622 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ | |
397b5bde LR |
1623 | {bgp_fsm_event_error, Idle}, /* Receive_KEEPALIVE_message */ |
1624 | {bgp_fsm_event_error, Idle}, /* Receive_UPDATE_message */ | |
718e3744 | 1625 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ |
ca058a30 | 1626 | {bgp_ignore, Idle}, /* Clearing_Completed */ |
718e3744 | 1627 | }, |
1628 | { | |
1629 | /* OpenConfirm, */ | |
1630 | {bgp_ignore, OpenConfirm}, /* BGP_Start */ | |
1631 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1632 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1633 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1634 | {bgp_stop, Idle}, /* TCP_connection_open_failed */ | |
1635 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1636 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ | |
1637 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
1638 | {bgp_ignore, OpenConfirm}, /* KeepAlive_timer_expired */ | |
1639 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
1640 | {bgp_establish, Established}, /* Receive_KEEPALIVE_message */ | |
1641 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
1642 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
ca058a30 | 1643 | {bgp_ignore, Idle}, /* Clearing_Completed */ |
718e3744 | 1644 | }, |
1645 | { | |
1646 | /* Established, */ | |
ca058a30 PJ |
1647 | {bgp_ignore, Established}, /* BGP_Start */ |
1648 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
1649 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1650 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
3117b5c4 | 1651 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ |
ca058a30 | 1652 | {bgp_stop, Clearing}, /* TCP_fatal_error */ |
3117b5c4 | 1653 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ |
ca058a30 | 1654 | {bgp_fsm_holdtime_expire, Clearing}, /* Hold_Timer_expired */ |
718e3744 | 1655 | {bgp_fsm_keepalive_expire, Established}, /* KeepAlive_timer_expired */ |
ca058a30 PJ |
1656 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ |
1657 | {bgp_fsm_keepalive, Established}, /* Receive_KEEPALIVE_message */ | |
1658 | {bgp_fsm_update, Established}, /* Receive_UPDATE_message */ | |
1659 | {bgp_stop_with_error, Clearing}, /* Receive_NOTIFICATION_message */ | |
1660 | {bgp_ignore, Idle}, /* Clearing_Completed */ | |
1661 | }, | |
1662 | { | |
1663 | /* Clearing, */ | |
1664 | {bgp_ignore, Clearing}, /* BGP_Start */ | |
3117b5c4 SH |
1665 | {bgp_stop, Clearing}, /* BGP_Stop */ |
1666 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1667 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
1668 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
1669 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
1670 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
1671 | {bgp_stop, Clearing}, /* Hold_Timer_expired */ | |
1672 | {bgp_stop, Clearing}, /* KeepAlive_timer_expired */ | |
1673 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
1674 | {bgp_stop, Clearing}, /* Receive_KEEPALIVE_message */ | |
1675 | {bgp_stop, Clearing}, /* Receive_UPDATE_message */ | |
1676 | {bgp_stop, Clearing}, /* Receive_NOTIFICATION_message */ | |
1677 | {bgp_clearing_completed, Idle}, /* Clearing_Completed */ | |
ca058a30 PJ |
1678 | }, |
1679 | { | |
1680 | /* Deleted, */ | |
1681 | {bgp_ignore, Deleted}, /* BGP_Start */ | |
1682 | {bgp_ignore, Deleted}, /* BGP_Stop */ | |
1683 | {bgp_ignore, Deleted}, /* TCP_connection_open */ | |
1684 | {bgp_ignore, Deleted}, /* TCP_connection_closed */ | |
1685 | {bgp_ignore, Deleted}, /* TCP_connection_open_failed */ | |
1686 | {bgp_ignore, Deleted}, /* TCP_fatal_error */ | |
1687 | {bgp_ignore, Deleted}, /* ConnectRetry_timer_expired */ | |
1688 | {bgp_ignore, Deleted}, /* Hold_Timer_expired */ | |
1689 | {bgp_ignore, Deleted}, /* KeepAlive_timer_expired */ | |
1690 | {bgp_ignore, Deleted}, /* Receive_OPEN_message */ | |
1691 | {bgp_ignore, Deleted}, /* Receive_KEEPALIVE_message */ | |
1692 | {bgp_ignore, Deleted}, /* Receive_UPDATE_message */ | |
1693 | {bgp_ignore, Deleted}, /* Receive_NOTIFICATION_message */ | |
1694 | {bgp_ignore, Deleted}, /* Clearing_Completed */ | |
718e3744 | 1695 | }, |
1696 | }; | |
1697 | ||
fd79ac91 | 1698 | static const char *bgp_event_str[] = |
718e3744 | 1699 | { |
1700 | NULL, | |
1701 | "BGP_Start", | |
1702 | "BGP_Stop", | |
1703 | "TCP_connection_open", | |
1704 | "TCP_connection_closed", | |
1705 | "TCP_connection_open_failed", | |
1706 | "TCP_fatal_error", | |
1707 | "ConnectRetry_timer_expired", | |
1708 | "Hold_Timer_expired", | |
1709 | "KeepAlive_timer_expired", | |
1710 | "Receive_OPEN_message", | |
1711 | "Receive_KEEPALIVE_message", | |
1712 | "Receive_UPDATE_message", | |
ca058a30 PJ |
1713 | "Receive_NOTIFICATION_message", |
1714 | "Clearing_Completed", | |
718e3744 | 1715 | }; |
1716 | ||
1717 | /* Execute event process. */ | |
1718 | int | |
1719 | bgp_event (struct thread *thread) | |
1720 | { | |
718e3744 | 1721 | int event; |
718e3744 | 1722 | struct peer *peer; |
1ff9a340 | 1723 | int ret; |
718e3744 | 1724 | |
1725 | peer = THREAD_ARG (thread); | |
1726 | event = THREAD_VAL (thread); | |
1727 | ||
1ff9a340 DS |
1728 | ret = bgp_event_update(peer, event); |
1729 | ||
1730 | return (ret); | |
1731 | } | |
1732 | ||
1733 | int | |
1734 | bgp_event_update (struct peer *peer, int event) | |
1735 | { | |
1736 | int next; | |
1737 | int ret = 0; | |
1738 | struct peer *other; | |
1739 | int passive_conn = 0; | |
1740 | ||
1741 | other = peer->doppelganger; | |
1742 | passive_conn = (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) ? 1 : 0; | |
1743 | ||
718e3744 | 1744 | /* Logging this event. */ |
1745 | next = FSM [peer->status -1][event - 1].next_state; | |
1746 | ||
16286195 DS |
1747 | if (bgp_debug_neighbor_events(peer) && peer->status != next) |
1748 | zlog_debug ("%s [FSM] %s (%s->%s)", peer->host, | |
718e3744 | 1749 | bgp_event_str[event], |
1750 | LOOKUP (bgp_status_msg, peer->status), | |
1751 | LOOKUP (bgp_status_msg, next)); | |
718e3744 | 1752 | |
1753 | /* Call function. */ | |
ca058a30 PJ |
1754 | if (FSM [peer->status -1][event - 1].func) |
1755 | ret = (*(FSM [peer->status - 1][event - 1].func))(peer); | |
718e3744 | 1756 | |
1757 | /* When function do not want proceed next job return -1. */ | |
200df115 | 1758 | if (ret >= 0) |
1759 | { | |
1ff9a340 DS |
1760 | if (ret == 1 && next == Established) |
1761 | { | |
1762 | /* The case when doppelganger swap accurred in bgp_establish. | |
1763 | Update the peer pointer accordingly */ | |
1764 | peer = other; | |
1765 | } | |
1766 | ||
200df115 | 1767 | /* If status is changed. */ |
1768 | if (next != peer->status) | |
f2c31acb | 1769 | bgp_fsm_change_status (peer, next); |
95fdcd8a | 1770 | |
200df115 | 1771 | /* Make sure timer is set. */ |
1772 | bgp_timer_set (peer); | |
1ff9a340 DS |
1773 | |
1774 | } | |
1775 | else if (!passive_conn && peer->bgp) | |
1776 | { | |
1777 | /* If we got a return value of -1, that means there was an error, restart | |
1778 | * the FSM. If the peer structure was deleted | |
1779 | */ | |
1780 | bgp_fsm_change_status(peer, Idle); | |
1781 | bgp_timer_set(peer); | |
200df115 | 1782 | } |
200df115 | 1783 | return ret; |
718e3744 | 1784 | } |