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718e3744 | 1 | /* BGP-4 Finite State Machine |
896014f4 DL |
2 | * From RFC1771 [A Border Gateway Protocol 4 (BGP-4)] |
3 | * Copyright (C) 1996, 97, 98 Kunihiro Ishiguro | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along | |
18 | * with this program; see the file COPYING; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
718e3744 | 21 | |
22 | #include <zebra.h> | |
23 | ||
24 | #include "linklist.h" | |
25 | #include "prefix.h" | |
718e3744 | 26 | #include "sockunion.h" |
27 | #include "thread.h" | |
28 | #include "log.h" | |
29 | #include "stream.h" | |
30 | #include "memory.h" | |
31 | #include "plist.h" | |
f188f2c4 | 32 | #include "workqueue.h" |
3f9c7369 | 33 | #include "queue.h" |
039f3a34 | 34 | #include "filter.h" |
4dcadbef | 35 | #include "command.h" |
718e3744 | 36 | |
856ca177 | 37 | #include "lib/json.h" |
718e3744 | 38 | #include "bgpd/bgpd.h" |
39 | #include "bgpd/bgp_attr.h" | |
40 | #include "bgpd/bgp_debug.h" | |
41 | #include "bgpd/bgp_fsm.h" | |
42 | #include "bgpd/bgp_packet.h" | |
43 | #include "bgpd/bgp_network.h" | |
44 | #include "bgpd/bgp_route.h" | |
45 | #include "bgpd/bgp_dump.h" | |
46 | #include "bgpd/bgp_open.h" | |
f188f2c4 | 47 | #include "bgpd/bgp_advertise.h" |
3f9c7369 | 48 | #include "bgpd/bgp_updgrp.h" |
ffd0c037 | 49 | #include "bgpd/bgp_nht.h" |
c43ed2e4 | 50 | #include "bgpd/bgp_bfd.h" |
4a1ab8e4 | 51 | #include "bgpd/bgp_memory.h" |
6b0655a2 | 52 | |
3012671f DL |
53 | DEFINE_HOOK(peer_backward_transition, (struct peer *peer), (peer)) |
54 | DEFINE_HOOK(peer_established, (struct peer *peer), (peer)) | |
55 | ||
6403814c DS |
56 | /* Definition of display strings corresponding to FSM events. This should be |
57 | * kept consistent with the events defined in bgpd.h | |
58 | */ | |
59 | static const char *bgp_event_str[] = | |
60 | { | |
61 | NULL, | |
62 | "BGP_Start", | |
63 | "BGP_Stop", | |
64 | "TCP_connection_open", | |
65 | "TCP_connection_closed", | |
66 | "TCP_connection_open_failed", | |
67 | "TCP_fatal_error", | |
68 | "ConnectRetry_timer_expired", | |
69 | "Hold_Timer_expired", | |
70 | "KeepAlive_timer_expired", | |
71 | "Receive_OPEN_message", | |
72 | "Receive_KEEPALIVE_message", | |
73 | "Receive_UPDATE_message", | |
74 | "Receive_NOTIFICATION_message", | |
75 | "Clearing_Completed", | |
76 | }; | |
77 | ||
718e3744 | 78 | /* BGP FSM (finite state machine) has three types of functions. Type |
79 | one is thread functions. Type two is event functions. Type three | |
80 | is FSM functions. Timer functions are set by bgp_timer_set | |
81 | function. */ | |
82 | ||
83 | /* BGP event function. */ | |
84 | int bgp_event (struct thread *); | |
85 | ||
86 | /* BGP thread functions. */ | |
87 | static int bgp_start_timer (struct thread *); | |
88 | static int bgp_connect_timer (struct thread *); | |
89 | static int bgp_holdtime_timer (struct thread *); | |
90 | static int bgp_keepalive_timer (struct thread *); | |
91 | ||
92 | /* BGP FSM functions. */ | |
93 | static int bgp_start (struct peer *); | |
94 | ||
1ff9a340 DS |
95 | static void |
96 | peer_xfer_stats (struct peer *peer_dst, struct peer *peer_src) | |
97 | { | |
98 | /* Copy stats over. These are only the pre-established state stats */ | |
99 | peer_dst->open_in += peer_src->open_in; | |
100 | peer_dst->open_out += peer_src->open_out; | |
101 | peer_dst->keepalive_in += peer_src->keepalive_in; | |
102 | peer_dst->keepalive_out += peer_src->keepalive_out; | |
103 | peer_dst->notify_in += peer_src->notify_in; | |
104 | peer_dst->notify_out += peer_src->notify_out; | |
105 | peer_dst->dynamic_cap_in += peer_src->dynamic_cap_in; | |
106 | peer_dst->dynamic_cap_out += peer_src->dynamic_cap_out; | |
107 | } | |
108 | ||
109 | static struct peer * | |
110 | peer_xfer_conn(struct peer *from_peer) | |
111 | { | |
112 | struct peer *peer; | |
113 | afi_t afi; | |
114 | safi_t safi; | |
115 | int fd; | |
116 | int status, pstatus; | |
6403814c | 117 | unsigned char last_evt, last_maj_evt; |
1ff9a340 DS |
118 | |
119 | assert(from_peer != NULL); | |
120 | ||
121 | peer = from_peer->doppelganger; | |
122 | ||
123 | if (!peer || !CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE)) | |
124 | return from_peer; | |
125 | ||
3f9c7369 | 126 | if (bgp_debug_neighbor_events(peer)) |
5b6dc0dd DS |
127 | zlog_debug ("%s: peer transfer %p fd %d -> %p fd %d)", from_peer->host, |
128 | from_peer, from_peer->fd, peer, peer->fd); | |
3f9c7369 | 129 | |
1ff9a340 DS |
130 | BGP_WRITE_OFF(peer->t_write); |
131 | BGP_READ_OFF(peer->t_read); | |
132 | BGP_WRITE_OFF(from_peer->t_write); | |
133 | BGP_READ_OFF(from_peer->t_read); | |
134 | ||
3f9c7369 DS |
135 | BGP_TIMER_OFF(peer->t_routeadv); |
136 | BGP_TIMER_OFF(from_peer->t_routeadv); | |
137 | ||
1ff9a340 DS |
138 | fd = peer->fd; |
139 | peer->fd = from_peer->fd; | |
140 | from_peer->fd = fd; | |
141 | stream_reset(peer->ibuf); | |
142 | stream_fifo_clean(peer->obuf); | |
143 | stream_fifo_clean(from_peer->obuf); | |
144 | ||
0299c004 | 145 | peer->as = from_peer->as; |
1ff9a340 DS |
146 | peer->v_holdtime = from_peer->v_holdtime; |
147 | peer->v_keepalive = from_peer->v_keepalive; | |
1ff9a340 DS |
148 | peer->routeadv = from_peer->routeadv; |
149 | peer->v_routeadv = from_peer->v_routeadv; | |
150 | peer->v_gr_restart = from_peer->v_gr_restart; | |
151 | peer->cap = from_peer->cap; | |
152 | status = peer->status; | |
153 | pstatus = peer->ostatus; | |
6403814c DS |
154 | last_evt = peer->last_event; |
155 | last_maj_evt = peer->last_major_event; | |
1ff9a340 DS |
156 | peer->status = from_peer->status; |
157 | peer->ostatus = from_peer->ostatus; | |
6403814c DS |
158 | peer->last_event = from_peer->last_event; |
159 | peer->last_major_event = from_peer->last_major_event; | |
1ff9a340 DS |
160 | from_peer->status = status; |
161 | from_peer->ostatus = pstatus; | |
6403814c DS |
162 | from_peer->last_event = last_evt; |
163 | from_peer->last_major_event = last_maj_evt; | |
1ff9a340 | 164 | peer->remote_id = from_peer->remote_id; |
f9e9e073 | 165 | |
04b6bdc0 | 166 | if (from_peer->hostname != NULL) |
f9e9e073 DW |
167 | { |
168 | if (peer->hostname) | |
169 | { | |
4a1ab8e4 | 170 | XFREE(MTYPE_BGP_PEER_HOST, peer->hostname); |
f9e9e073 DW |
171 | peer->hostname = NULL; |
172 | } | |
173 | ||
658bbf6d | 174 | peer->hostname = from_peer->hostname; |
f9e9e073 DW |
175 | from_peer->hostname = NULL; |
176 | } | |
177 | ||
04b6bdc0 | 178 | if (from_peer->domainname != NULL) |
f9e9e073 DW |
179 | { |
180 | if (peer->domainname) | |
181 | { | |
4a1ab8e4 | 182 | XFREE(MTYPE_BGP_PEER_HOST, peer->domainname); |
f9e9e073 DW |
183 | peer->domainname= NULL; |
184 | } | |
185 | ||
658bbf6d | 186 | peer->domainname = from_peer->domainname; |
f9e9e073 DW |
187 | from_peer->domainname = NULL; |
188 | } | |
1ff9a340 DS |
189 | |
190 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
191 | for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++) | |
192 | { | |
193 | peer->af_flags[afi][safi] = from_peer->af_flags[afi][safi]; | |
194 | peer->af_sflags[afi][safi] = from_peer->af_sflags[afi][safi]; | |
195 | peer->af_cap[afi][safi] = from_peer->af_cap[afi][safi]; | |
196 | peer->afc_nego[afi][safi] = from_peer->afc_nego[afi][safi]; | |
197 | peer->afc_adv[afi][safi] = from_peer->afc_adv[afi][safi]; | |
198 | peer->afc_recv[afi][safi] = from_peer->afc_recv[afi][safi]; | |
40d2700d | 199 | peer->orf_plist[afi][safi] = from_peer->orf_plist[afi][safi]; |
1ff9a340 DS |
200 | } |
201 | ||
202 | if (bgp_getsockname(peer) < 0) | |
203 | { | |
204 | zlog_err ("%%bgp_getsockname() failed for %s peer %s fd %d (from_peer fd %d)", | |
205 | (CHECK_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER) ? "accept" : ""), | |
206 | peer->host, peer->fd, from_peer->fd); | |
207 | bgp_stop(peer); | |
208 | bgp_stop(from_peer); | |
209 | return NULL; | |
210 | } | |
211 | if (from_peer->status > Active) | |
212 | { | |
213 | if (bgp_getsockname(from_peer) < 0) | |
214 | { | |
215 | zlog_err ("%%bgp_getsockname() failed for %s from_peer %s fd %d (peer fd %d)", | |
216 | (CHECK_FLAG (from_peer->sflags, PEER_STATUS_ACCEPT_PEER) ? "accept" : ""), | |
217 | from_peer->host, from_peer->fd, peer->fd); | |
218 | bgp_stop(from_peer); | |
219 | from_peer = NULL; | |
220 | } | |
221 | } | |
222 | ||
223 | BGP_READ_ON(peer->t_read, bgp_read, peer->fd); | |
224 | BGP_WRITE_ON(peer->t_write, bgp_write, peer->fd); | |
225 | ||
226 | if (from_peer) | |
227 | peer_xfer_stats(peer, from_peer); | |
228 | ||
229 | return(peer); | |
230 | } | |
231 | ||
718e3744 | 232 | /* Hook function called after bgp event is occered. And vty's |
233 | neighbor command invoke this function after making neighbor | |
234 | structure. */ | |
235 | void | |
236 | bgp_timer_set (struct peer *peer) | |
237 | { | |
718e3744 | 238 | switch (peer->status) |
239 | { | |
240 | case Idle: | |
241 | /* First entry point of peer's finite state machine. In Idle | |
242 | status start timer is on unless peer is shutdown or peer is | |
243 | inactive. All other timer must be turned off */ | |
ca058a30 | 244 | if (BGP_PEER_START_SUPPRESSED (peer) || ! peer_active (peer)) |
718e3744 | 245 | { |
246 | BGP_TIMER_OFF (peer->t_start); | |
247 | } | |
248 | else | |
249 | { | |
718e3744 | 250 | BGP_TIMER_ON (peer->t_start, bgp_start_timer, |
5ca5f1c8 | 251 | peer->v_start); |
718e3744 | 252 | } |
253 | BGP_TIMER_OFF (peer->t_connect); | |
254 | BGP_TIMER_OFF (peer->t_holdtime); | |
255 | BGP_TIMER_OFF (peer->t_keepalive); | |
718e3744 | 256 | BGP_TIMER_OFF (peer->t_routeadv); |
257 | break; | |
258 | ||
259 | case Connect: | |
5ca5f1c8 | 260 | /* After start timer is expired, the peer moves to Connect |
718e3744 | 261 | status. Make sure start timer is off and connect timer is |
262 | on. */ | |
263 | BGP_TIMER_OFF (peer->t_start); | |
264 | BGP_TIMER_ON (peer->t_connect, bgp_connect_timer, peer->v_connect); | |
265 | BGP_TIMER_OFF (peer->t_holdtime); | |
266 | BGP_TIMER_OFF (peer->t_keepalive); | |
718e3744 | 267 | BGP_TIMER_OFF (peer->t_routeadv); |
268 | break; | |
269 | ||
270 | case Active: | |
271 | /* Active is waiting connection from remote peer. And if | |
272 | connect timer is expired, change status to Connect. */ | |
273 | BGP_TIMER_OFF (peer->t_start); | |
274 | /* If peer is passive mode, do not set connect timer. */ | |
93406d87 | 275 | if (CHECK_FLAG (peer->flags, PEER_FLAG_PASSIVE) |
276 | || CHECK_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT)) | |
718e3744 | 277 | { |
278 | BGP_TIMER_OFF (peer->t_connect); | |
279 | } | |
280 | else | |
281 | { | |
282 | BGP_TIMER_ON (peer->t_connect, bgp_connect_timer, peer->v_connect); | |
283 | } | |
284 | BGP_TIMER_OFF (peer->t_holdtime); | |
285 | BGP_TIMER_OFF (peer->t_keepalive); | |
718e3744 | 286 | BGP_TIMER_OFF (peer->t_routeadv); |
287 | break; | |
288 | ||
289 | case OpenSent: | |
290 | /* OpenSent status. */ | |
291 | BGP_TIMER_OFF (peer->t_start); | |
292 | BGP_TIMER_OFF (peer->t_connect); | |
293 | if (peer->v_holdtime != 0) | |
294 | { | |
295 | BGP_TIMER_ON (peer->t_holdtime, bgp_holdtime_timer, | |
296 | peer->v_holdtime); | |
297 | } | |
298 | else | |
299 | { | |
300 | BGP_TIMER_OFF (peer->t_holdtime); | |
301 | } | |
302 | BGP_TIMER_OFF (peer->t_keepalive); | |
718e3744 | 303 | BGP_TIMER_OFF (peer->t_routeadv); |
304 | break; | |
305 | ||
306 | case OpenConfirm: | |
307 | /* OpenConfirm status. */ | |
308 | BGP_TIMER_OFF (peer->t_start); | |
309 | BGP_TIMER_OFF (peer->t_connect); | |
310 | ||
311 | /* If the negotiated Hold Time value is zero, then the Hold Time | |
312 | timer and KeepAlive timers are not started. */ | |
313 | if (peer->v_holdtime == 0) | |
314 | { | |
315 | BGP_TIMER_OFF (peer->t_holdtime); | |
316 | BGP_TIMER_OFF (peer->t_keepalive); | |
317 | } | |
318 | else | |
319 | { | |
320 | BGP_TIMER_ON (peer->t_holdtime, bgp_holdtime_timer, | |
321 | peer->v_holdtime); | |
322 | BGP_TIMER_ON (peer->t_keepalive, bgp_keepalive_timer, | |
323 | peer->v_keepalive); | |
324 | } | |
718e3744 | 325 | BGP_TIMER_OFF (peer->t_routeadv); |
326 | break; | |
327 | ||
328 | case Established: | |
329 | /* In Established status start and connect timer is turned | |
330 | off. */ | |
331 | BGP_TIMER_OFF (peer->t_start); | |
332 | BGP_TIMER_OFF (peer->t_connect); | |
333 | ||
334 | /* Same as OpenConfirm, if holdtime is zero then both holdtime | |
335 | and keepalive must be turned off. */ | |
336 | if (peer->v_holdtime == 0) | |
337 | { | |
338 | BGP_TIMER_OFF (peer->t_holdtime); | |
339 | BGP_TIMER_OFF (peer->t_keepalive); | |
340 | } | |
341 | else | |
342 | { | |
343 | BGP_TIMER_ON (peer->t_holdtime, bgp_holdtime_timer, | |
344 | peer->v_holdtime); | |
345 | BGP_TIMER_ON (peer->t_keepalive, bgp_keepalive_timer, | |
346 | peer->v_keepalive); | |
347 | } | |
718e3744 | 348 | break; |
ca058a30 PJ |
349 | case Deleted: |
350 | BGP_TIMER_OFF (peer->t_gr_restart); | |
351 | BGP_TIMER_OFF (peer->t_gr_stale); | |
352 | BGP_TIMER_OFF (peer->t_pmax_restart); | |
353 | case Clearing: | |
354 | BGP_TIMER_OFF (peer->t_start); | |
355 | BGP_TIMER_OFF (peer->t_connect); | |
356 | BGP_TIMER_OFF (peer->t_holdtime); | |
357 | BGP_TIMER_OFF (peer->t_keepalive); | |
ca058a30 | 358 | BGP_TIMER_OFF (peer->t_routeadv); |
1ff9a340 | 359 | break; |
718e3744 | 360 | } |
361 | } | |
362 | ||
363 | /* BGP start timer. This function set BGP_Start event to thread value | |
364 | and process event. */ | |
365 | static int | |
366 | bgp_start_timer (struct thread *thread) | |
367 | { | |
368 | struct peer *peer; | |
369 | ||
370 | peer = THREAD_ARG (thread); | |
371 | peer->t_start = NULL; | |
372 | ||
16286195 DS |
373 | if (bgp_debug_neighbor_events(peer)) |
374 | zlog_debug("%s [FSM] Timer (start timer expire).", peer->host); | |
718e3744 | 375 | |
376 | THREAD_VAL (thread) = BGP_Start; | |
200df115 | 377 | bgp_event (thread); /* bgp_event unlocks peer */ |
718e3744 | 378 | |
379 | return 0; | |
380 | } | |
381 | ||
382 | /* BGP connect retry timer. */ | |
383 | static int | |
384 | bgp_connect_timer (struct thread *thread) | |
385 | { | |
386 | struct peer *peer; | |
1ff9a340 | 387 | int ret; |
718e3744 | 388 | |
389 | peer = THREAD_ARG (thread); | |
390 | peer->t_connect = NULL; | |
391 | ||
16286195 DS |
392 | if (bgp_debug_neighbor_events(peer)) |
393 | zlog_debug("%s [FSM] Timer (connect timer expire)", peer->host); | |
718e3744 | 394 | |
1ff9a340 DS |
395 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
396 | { | |
397 | bgp_stop(peer); | |
398 | ret = -1; | |
399 | } | |
400 | else | |
401 | { | |
402 | THREAD_VAL (thread) = ConnectRetry_timer_expired; | |
403 | bgp_event (thread); /* bgp_event unlocks peer */ | |
404 | ret = 0; | |
405 | } | |
718e3744 | 406 | |
1ff9a340 | 407 | return ret; |
718e3744 | 408 | } |
409 | ||
410 | /* BGP holdtime timer. */ | |
411 | static int | |
412 | bgp_holdtime_timer (struct thread *thread) | |
413 | { | |
414 | struct peer *peer; | |
415 | ||
416 | peer = THREAD_ARG (thread); | |
417 | peer->t_holdtime = NULL; | |
418 | ||
16286195 DS |
419 | if (bgp_debug_neighbor_events(peer)) |
420 | zlog_debug ("%s [FSM] Timer (holdtime timer expire)", peer->host); | |
718e3744 | 421 | |
422 | THREAD_VAL (thread) = Hold_Timer_expired; | |
200df115 | 423 | bgp_event (thread); /* bgp_event unlocks peer */ |
718e3744 | 424 | |
425 | return 0; | |
426 | } | |
427 | ||
428 | /* BGP keepalive fire ! */ | |
429 | static int | |
430 | bgp_keepalive_timer (struct thread *thread) | |
431 | { | |
432 | struct peer *peer; | |
433 | ||
434 | peer = THREAD_ARG (thread); | |
435 | peer->t_keepalive = NULL; | |
436 | ||
16286195 DS |
437 | if (bgp_debug_neighbor_events(peer)) |
438 | zlog_debug ("%s [FSM] Timer (keepalive timer expire)", peer->host); | |
718e3744 | 439 | |
440 | THREAD_VAL (thread) = KeepAlive_timer_expired; | |
200df115 | 441 | bgp_event (thread); /* bgp_event unlocks peer */ |
718e3744 | 442 | |
443 | return 0; | |
444 | } | |
445 | ||
3f9c7369 | 446 | int |
718e3744 | 447 | bgp_routeadv_timer (struct thread *thread) |
448 | { | |
449 | struct peer *peer; | |
450 | ||
451 | peer = THREAD_ARG (thread); | |
452 | peer->t_routeadv = NULL; | |
453 | ||
16286195 DS |
454 | if (bgp_debug_neighbor_events(peer)) |
455 | zlog_debug ("%s [FSM] Timer (routeadv timer expire)", peer->host); | |
718e3744 | 456 | |
65957886 | 457 | peer->synctime = bgp_clock (); |
718e3744 | 458 | |
eb821189 | 459 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
718e3744 | 460 | |
3f9c7369 DS |
461 | /* MRAI timer will be started again when FIFO is built, no need to |
462 | * do it here. | |
cb1faec9 | 463 | */ |
718e3744 | 464 | return 0; |
465 | } | |
466 | ||
e0701b79 | 467 | /* BGP Peer Down Cause */ |
fd79ac91 | 468 | const char *peer_down_str[] = |
e0701b79 | 469 | { |
470 | "", | |
471 | "Router ID changed", | |
472 | "Remote AS changed", | |
473 | "Local AS change", | |
474 | "Cluster ID changed", | |
475 | "Confederation identifier changed", | |
476 | "Confederation peer changed", | |
477 | "RR client config change", | |
478 | "RS client config change", | |
479 | "Update source change", | |
480 | "Address family activated", | |
481 | "Admin. shutdown", | |
482 | "User reset", | |
483 | "BGP Notification received", | |
484 | "BGP Notification send", | |
485 | "Peer closed the session", | |
486 | "Neighbor deleted", | |
487 | "Peer-group add member", | |
488 | "Peer-group delete member", | |
489 | "Capability changed", | |
490 | "Passive config change", | |
93406d87 | 491 | "Multihop config change", |
cceb0bfc | 492 | "NSF peer closed the session", |
7bbc6864 | 493 | "Intf peering v6only config change", |
e60480bd DD |
494 | "BFD down received", |
495 | "Interface down", | |
496 | "Neighbor address lost" | |
e0701b79 | 497 | }; |
498 | ||
94f2b392 | 499 | static int |
93406d87 | 500 | bgp_graceful_restart_timer_expire (struct thread *thread) |
501 | { | |
502 | struct peer *peer; | |
503 | afi_t afi; | |
504 | safi_t safi; | |
505 | ||
506 | peer = THREAD_ARG (thread); | |
507 | peer->t_gr_restart = NULL; | |
508 | ||
509 | /* NSF delete stale route */ | |
510 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
4d5b4f7b | 511 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_4 ; safi++) |
93406d87 | 512 | if (peer->nsf[afi][safi]) |
513 | bgp_clear_stale_route (peer, afi, safi); | |
514 | ||
515 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT); | |
516 | BGP_TIMER_OFF (peer->t_gr_stale); | |
517 | ||
16286195 | 518 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 519 | { |
520 | zlog_debug ("%s graceful restart timer expired", peer->host); | |
521 | zlog_debug ("%s graceful restart stalepath timer stopped", peer->host); | |
522 | } | |
523 | ||
524 | bgp_timer_set (peer); | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
94f2b392 | 529 | static int |
93406d87 | 530 | bgp_graceful_stale_timer_expire (struct thread *thread) |
531 | { | |
532 | struct peer *peer; | |
533 | afi_t afi; | |
534 | safi_t safi; | |
535 | ||
536 | peer = THREAD_ARG (thread); | |
537 | peer->t_gr_stale = NULL; | |
538 | ||
16286195 | 539 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 540 | zlog_debug ("%s graceful restart stalepath timer expired", peer->host); |
541 | ||
542 | /* NSF delete stale route */ | |
543 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
4d5b4f7b | 544 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_4 ; safi++) |
93406d87 | 545 | if (peer->nsf[afi][safi]) |
546 | bgp_clear_stale_route (peer, afi, safi); | |
547 | ||
548 | return 0; | |
549 | } | |
550 | ||
f188f2c4 DS |
551 | static int |
552 | bgp_update_delay_applicable (struct bgp *bgp) | |
553 | { | |
554 | /* update_delay_over flag should be reset (set to 0) for any new | |
555 | applicability of the update-delay during BGP process lifetime. | |
556 | And it should be set after an occurence of the update-delay is over)*/ | |
557 | if (!bgp->update_delay_over) | |
558 | return 1; | |
559 | ||
560 | return 0; | |
561 | } | |
562 | ||
563 | int | |
564 | bgp_update_delay_active (struct bgp *bgp) | |
565 | { | |
566 | if (bgp->t_update_delay) | |
567 | return 1; | |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
572 | int | |
573 | bgp_update_delay_configured (struct bgp *bgp) | |
574 | { | |
575 | if (bgp->v_update_delay) | |
576 | return 1; | |
577 | ||
578 | return 0; | |
579 | } | |
580 | ||
581 | /* Do the post-processing needed when bgp comes out of the read-only mode | |
582 | on ending the update delay. */ | |
583 | void | |
584 | bgp_update_delay_end (struct bgp *bgp) | |
585 | { | |
f188f2c4 DS |
586 | THREAD_TIMER_OFF (bgp->t_update_delay); |
587 | THREAD_TIMER_OFF (bgp->t_establish_wait); | |
588 | ||
589 | /* Reset update-delay related state */ | |
590 | bgp->update_delay_over = 1; | |
591 | bgp->established = 0; | |
592 | bgp->restarted_peers = 0; | |
593 | bgp->implicit_eors = 0; | |
594 | bgp->explicit_eors = 0; | |
595 | ||
596 | quagga_timestamp(3, bgp->update_delay_end_time, | |
597 | sizeof(bgp->update_delay_end_time)); | |
598 | ||
cb1faec9 DS |
599 | /* |
600 | * Add an end-of-initial-update marker to the main process queues so that | |
4a16ae86 DS |
601 | * the route advertisement timer for the peers can be started. Also set |
602 | * the zebra and peer update hold flags. These flags are used to achieve | |
603 | * three stages in the update-delay post processing: | |
604 | * 1. Finish best-path selection for all the prefixes held on the queues. | |
605 | * (routes in BGP are updated, and peers sync queues are populated too) | |
606 | * 2. As the eoiu mark is reached in the bgp process routine, ship all the | |
607 | * routes to zebra. With that zebra should see updates from BGP close | |
608 | * to each other. | |
609 | * 3. Unblock the peer update writes. With that peer update packing with | |
610 | * the prefixes should be at its maximum. | |
cb1faec9 | 611 | */ |
2a3d5731 | 612 | bgp_add_eoiu_mark(bgp); |
4a16ae86 DS |
613 | bgp->main_zebra_update_hold = 1; |
614 | bgp->main_peers_update_hold = 1; | |
f188f2c4 DS |
615 | |
616 | /* Resume the queue processing. This should trigger the event that would take | |
617 | care of processing any work that was queued during the read-only mode. */ | |
618 | work_queue_unplug(bm->process_main_queue); | |
f188f2c4 DS |
619 | } |
620 | ||
cb1faec9 DS |
621 | /** |
622 | * see bgp_fsm.h | |
623 | */ | |
624 | void | |
625 | bgp_start_routeadv (struct bgp *bgp) | |
626 | { | |
627 | struct listnode *node, *nnode; | |
628 | struct peer *peer; | |
629 | ||
2a3d5731 DW |
630 | zlog_info("bgp_start_routeadv(), update hold status %d", |
631 | bgp->main_peers_update_hold); | |
4a16ae86 | 632 | |
2a3d5731 | 633 | if (bgp->main_peers_update_hold) |
4a16ae86 DS |
634 | return; |
635 | ||
636 | quagga_timestamp(3, bgp->update_delay_peers_resume_time, | |
637 | sizeof(bgp->update_delay_peers_resume_time)); | |
638 | ||
cb1faec9 DS |
639 | for (ALL_LIST_ELEMENTS (bgp->peer, node, nnode, peer)) |
640 | { | |
641 | if (peer->status != Established) | |
642 | continue; | |
643 | BGP_TIMER_OFF(peer->t_routeadv); | |
644 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
645 | } | |
646 | } | |
647 | ||
648 | /** | |
649 | * see bgp_fsm.h | |
650 | */ | |
651 | void | |
652 | bgp_adjust_routeadv (struct peer *peer) | |
653 | { | |
654 | time_t nowtime = bgp_clock(); | |
655 | double diff; | |
656 | unsigned long remain; | |
657 | ||
d889623f DS |
658 | /* Bypass checks for special case of MRAI being 0 */ |
659 | if (peer->v_routeadv == 0) | |
660 | { | |
661 | /* Stop existing timer, just in case it is running for a different | |
662 | * duration and schedule write thread immediately. | |
663 | */ | |
664 | if (peer->t_routeadv) | |
665 | BGP_TIMER_OFF(peer->t_routeadv); | |
666 | ||
667 | peer->synctime = bgp_clock (); | |
668 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); | |
669 | return; | |
670 | } | |
671 | ||
d889623f | 672 | |
cb1faec9 DS |
673 | /* |
674 | * CASE I: | |
675 | * If the last update was written more than MRAI back, expire the timer | |
676 | * instantly so that we can send the update out sooner. | |
677 | * | |
678 | * <------- MRAI ---------> | |
679 | * |-----------------|-----------------------| | |
680 | * <------------- m ------------> | |
681 | * ^ ^ ^ | |
682 | * | | | | |
683 | * | | current time | |
684 | * | timer start | |
685 | * last write | |
686 | * | |
687 | * m > MRAI | |
688 | */ | |
1ba2a97a | 689 | diff = difftime(nowtime, peer->last_update); |
cb1faec9 DS |
690 | if (diff > (double) peer->v_routeadv) |
691 | { | |
692 | BGP_TIMER_OFF(peer->t_routeadv); | |
693 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
cb1faec9 DS |
694 | return; |
695 | } | |
696 | ||
697 | /* | |
698 | * CASE II: | |
699 | * - Find when to expire the MRAI timer. | |
700 | * If MRAI timer is not active, assume we can start it now. | |
701 | * | |
702 | * <------- MRAI ---------> | |
703 | * |------------|-----------------------| | |
704 | * <-------- m ----------><----- r -----> | |
705 | * ^ ^ ^ | |
706 | * | | | | |
707 | * | | current time | |
708 | * | timer start | |
709 | * last write | |
710 | * | |
711 | * (MRAI - m) < r | |
712 | */ | |
713 | if (peer->t_routeadv) | |
714 | remain = thread_timer_remain_second(peer->t_routeadv); | |
715 | else | |
716 | remain = peer->v_routeadv; | |
717 | diff = peer->v_routeadv - diff; | |
718 | if (diff <= (double) remain) | |
719 | { | |
720 | BGP_TIMER_OFF(peer->t_routeadv); | |
721 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, diff); | |
cb1faec9 DS |
722 | } |
723 | } | |
724 | ||
abc920f8 DS |
725 | static int |
726 | bgp_maxmed_onstartup_applicable (struct bgp *bgp) | |
727 | { | |
728 | if (!bgp->maxmed_onstartup_over) | |
729 | return 1; | |
730 | ||
731 | return 0; | |
732 | } | |
733 | ||
734 | int | |
735 | bgp_maxmed_onstartup_configured (struct bgp *bgp) | |
736 | { | |
737 | if (bgp->v_maxmed_onstartup != BGP_MAXMED_ONSTARTUP_UNCONFIGURED) | |
738 | return 1; | |
739 | ||
740 | return 0; | |
741 | } | |
742 | ||
743 | int | |
744 | bgp_maxmed_onstartup_active (struct bgp *bgp) | |
745 | { | |
746 | if (bgp->t_maxmed_onstartup) | |
747 | return 1; | |
748 | ||
749 | return 0; | |
750 | } | |
751 | ||
752 | void | |
753 | bgp_maxmed_update (struct bgp *bgp) | |
754 | { | |
abc920f8 DS |
755 | u_char maxmed_active; |
756 | u_int32_t maxmed_value; | |
757 | ||
758 | if (bgp->v_maxmed_admin) | |
759 | { | |
760 | maxmed_active = 1; | |
761 | maxmed_value = bgp->maxmed_admin_value; | |
762 | } | |
763 | else if (bgp->t_maxmed_onstartup) | |
764 | { | |
765 | maxmed_active = 1; | |
766 | maxmed_value = bgp->maxmed_onstartup_value; | |
767 | } | |
768 | else | |
769 | { | |
770 | maxmed_active = 0; | |
771 | maxmed_value = BGP_MAXMED_VALUE_DEFAULT; | |
772 | } | |
773 | ||
774 | if (bgp->maxmed_active != maxmed_active || | |
775 | bgp->maxmed_value != maxmed_value) | |
776 | { | |
777 | bgp->maxmed_active = maxmed_active; | |
778 | bgp->maxmed_value = maxmed_value; | |
779 | ||
3f9c7369 | 780 | update_group_announce(bgp); |
abc920f8 DS |
781 | } |
782 | } | |
783 | ||
784 | /* The maxmed onstartup timer expiry callback. */ | |
785 | static int | |
786 | bgp_maxmed_onstartup_timer (struct thread *thread) | |
787 | { | |
788 | struct bgp *bgp; | |
789 | ||
790 | zlog_info ("Max med on startup ended - timer expired."); | |
791 | ||
792 | bgp = THREAD_ARG (thread); | |
793 | THREAD_TIMER_OFF (bgp->t_maxmed_onstartup); | |
794 | bgp->maxmed_onstartup_over = 1; | |
795 | ||
796 | bgp_maxmed_update(bgp); | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
801 | static void | |
802 | bgp_maxmed_onstartup_begin (struct bgp *bgp) | |
803 | { | |
804 | /* Applicable only once in the process lifetime on the startup */ | |
805 | if (bgp->maxmed_onstartup_over) | |
806 | return; | |
807 | ||
808 | zlog_info ("Begin maxmed onstartup mode - timer %d seconds", | |
809 | bgp->v_maxmed_onstartup); | |
810 | ||
ffa2c898 QY |
811 | thread_add_timer(bm->master, bgp_maxmed_onstartup_timer, bgp, |
812 | bgp->v_maxmed_onstartup, &bgp->t_maxmed_onstartup); | |
abc920f8 DS |
813 | |
814 | if (!bgp->v_maxmed_admin) | |
815 | { | |
816 | bgp->maxmed_active = 1; | |
817 | bgp->maxmed_value = bgp->maxmed_onstartup_value; | |
818 | } | |
819 | ||
820 | /* Route announce to all peers should happen after this in bgp_establish() */ | |
821 | } | |
822 | ||
823 | static void | |
824 | bgp_maxmed_onstartup_process_status_change(struct peer *peer) | |
825 | { | |
826 | if (peer->status == Established && !peer->bgp->established) | |
827 | { | |
828 | bgp_maxmed_onstartup_begin(peer->bgp); | |
829 | } | |
830 | } | |
831 | ||
f188f2c4 DS |
832 | /* The update delay timer expiry callback. */ |
833 | static int | |
834 | bgp_update_delay_timer (struct thread *thread) | |
835 | { | |
836 | struct bgp *bgp; | |
837 | ||
838 | zlog_info ("Update delay ended - timer expired."); | |
839 | ||
840 | bgp = THREAD_ARG (thread); | |
841 | THREAD_TIMER_OFF (bgp->t_update_delay); | |
842 | bgp_update_delay_end(bgp); | |
843 | ||
844 | return 0; | |
845 | } | |
846 | ||
847 | /* The establish wait timer expiry callback. */ | |
848 | static int | |
849 | bgp_establish_wait_timer (struct thread *thread) | |
850 | { | |
851 | struct bgp *bgp; | |
852 | ||
853 | zlog_info ("Establish wait - timer expired."); | |
854 | ||
855 | bgp = THREAD_ARG (thread); | |
856 | THREAD_TIMER_OFF (bgp->t_establish_wait); | |
857 | bgp_check_update_delay(bgp); | |
858 | ||
859 | return 0; | |
860 | } | |
861 | ||
862 | /* Steps to begin the update delay: | |
863 | - initialize queues if needed | |
864 | - stop the queue processing | |
865 | - start the timer */ | |
866 | static void | |
867 | bgp_update_delay_begin (struct bgp *bgp) | |
868 | { | |
869 | struct listnode *node, *nnode; | |
870 | struct peer *peer; | |
871 | ||
f188f2c4 DS |
872 | /* Stop the processing of queued work. Enqueue shall continue */ |
873 | work_queue_plug(bm->process_main_queue); | |
f188f2c4 DS |
874 | |
875 | for (ALL_LIST_ELEMENTS (bgp->peer, node, nnode, peer)) | |
876 | peer->update_delay_over = 0; | |
877 | ||
878 | /* Start the update-delay timer */ | |
ffa2c898 QY |
879 | thread_add_timer(bm->master, bgp_update_delay_timer, bgp, |
880 | bgp->v_update_delay, &bgp->t_update_delay); | |
f188f2c4 DS |
881 | |
882 | if (bgp->v_establish_wait != bgp->v_update_delay) | |
ffa2c898 QY |
883 | thread_add_timer(bm->master, bgp_establish_wait_timer, bgp, |
884 | bgp->v_establish_wait, &bgp->t_establish_wait); | |
f188f2c4 DS |
885 | |
886 | quagga_timestamp(3, bgp->update_delay_begin_time, | |
887 | sizeof(bgp->update_delay_begin_time)); | |
888 | } | |
889 | ||
890 | static void | |
891 | bgp_update_delay_process_status_change(struct peer *peer) | |
892 | { | |
893 | if (peer->status == Established) | |
894 | { | |
895 | if (!peer->bgp->established++) | |
896 | { | |
897 | bgp_update_delay_begin(peer->bgp); | |
898 | zlog_info ("Begin read-only mode - update-delay timer %d seconds", | |
899 | peer->bgp->v_update_delay); | |
900 | } | |
901 | if (CHECK_FLAG (peer->cap, PEER_CAP_RESTART_BIT_RCV)) | |
902 | bgp_update_restarted_peers(peer); | |
903 | } | |
904 | if (peer->ostatus == Established && bgp_update_delay_active(peer->bgp)) | |
905 | { | |
906 | /* Adjust the update-delay state to account for this flap. | |
907 | NOTE: Intentionally skipping adjusting implicit_eors or explicit_eors | |
908 | counters. Extra sanity check in bgp_check_update_delay() should | |
909 | be enough to take care of any additive discrepancy in bgp eor | |
910 | counters */ | |
911 | peer->bgp->established--; | |
912 | peer->update_delay_over = 0; | |
913 | } | |
914 | } | |
915 | ||
200df115 | 916 | /* Called after event occured, this function change status and reset |
917 | read/write and timer thread. */ | |
918 | void | |
919 | bgp_fsm_change_status (struct peer *peer, int status) | |
920 | { | |
1ff9a340 | 921 | |
200df115 | 922 | bgp_dump_state (peer, peer->status, status); |
923 | ||
f2c31acb PJ |
924 | /* Transition into Clearing or Deleted must /always/ clear all routes.. |
925 | * (and must do so before actually changing into Deleted.. | |
926 | */ | |
927 | if (status >= Clearing) | |
dc83d712 DS |
928 | { |
929 | bgp_clear_route_all (peer); | |
930 | ||
931 | /* If no route was queued for the clear-node processing, generate the | |
932 | * completion event here. This is needed because if there are no routes | |
933 | * to trigger the background clear-node thread, the event won't get | |
934 | * generated and the peer would be stuck in Clearing. Note that this | |
935 | * event is for the peer and helps the peer transition out of Clearing | |
936 | * state; it should not be generated per (AFI,SAFI). The event is | |
937 | * directly posted here without calling clear_node_complete() as we | |
938 | * shouldn't do an extra unlock. This event will get processed after | |
939 | * the state change that happens below, so peer will be in Clearing | |
940 | * (or Deleted). | |
941 | */ | |
b4575c00 | 942 | if (!work_queue_is_scheduled (peer->clear_node_queue)) |
dc83d712 DS |
943 | BGP_EVENT_ADD (peer, Clearing_Completed); |
944 | } | |
f2c31acb | 945 | |
200df115 | 946 | /* Preserve old status and change into new status. */ |
947 | peer->ostatus = peer->status; | |
948 | peer->status = status; | |
f188f2c4 | 949 | |
6403814c DS |
950 | /* Save event that caused status change. */ |
951 | peer->last_major_event = peer->cur_event; | |
952 | ||
1ff9a340 DS |
953 | if (status == Established) |
954 | UNSET_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER); | |
955 | ||
abc920f8 DS |
956 | /* If max-med processing is applicable, do the necessary. */ |
957 | if (status == Established) | |
958 | { | |
959 | if (bgp_maxmed_onstartup_configured(peer->bgp) && | |
960 | bgp_maxmed_onstartup_applicable(peer->bgp)) | |
961 | bgp_maxmed_onstartup_process_status_change(peer); | |
962 | else | |
963 | peer->bgp->maxmed_onstartup_over = 1; | |
964 | } | |
965 | ||
f188f2c4 DS |
966 | /* If update-delay processing is applicable, do the necessary. */ |
967 | if (bgp_update_delay_configured(peer->bgp) && | |
968 | bgp_update_delay_applicable(peer->bgp)) | |
969 | bgp_update_delay_process_status_change(peer); | |
970 | ||
16286195 | 971 | if (bgp_debug_neighbor_events(peer)) |
200df115 | 972 | zlog_debug ("%s went from %s to %s", |
973 | peer->host, | |
56b40679 QY |
974 | lookup_msg(bgp_status_msg, peer->ostatus, NULL), |
975 | lookup_msg(bgp_status_msg, peer->status, NULL)); | |
200df115 | 976 | } |
977 | ||
3117b5c4 | 978 | /* Flush the event queue and ensure the peer is shut down */ |
9e4ca89c | 979 | static int |
3117b5c4 SH |
980 | bgp_clearing_completed (struct peer *peer) |
981 | { | |
982 | int rc = bgp_stop(peer); | |
1ff9a340 DS |
983 | |
984 | if (rc >= 0) | |
985 | BGP_EVENT_FLUSH (peer); | |
3117b5c4 SH |
986 | |
987 | return rc; | |
988 | } | |
989 | ||
718e3744 | 990 | /* Administrative BGP peer stop event. */ |
3117b5c4 | 991 | /* May be called multiple times for the same peer */ |
718e3744 | 992 | int |
993 | bgp_stop (struct peer *peer) | |
994 | { | |
718e3744 | 995 | afi_t afi; |
996 | safi_t safi; | |
997 | char orf_name[BUFSIZ]; | |
1ff9a340 | 998 | int ret = 0; |
718e3744 | 999 | |
f14e6fdb DS |
1000 | if (peer_dynamic_neighbor(peer) && |
1001 | !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) | |
1002 | { | |
1003 | if (bgp_debug_neighbor_events(peer)) | |
1004 | zlog_debug ("%s (dynamic neighbor) deleted", peer->host); | |
1005 | peer_delete (peer); | |
1006 | return -1; | |
1007 | } | |
1008 | ||
3117b5c4 SH |
1009 | /* Can't do this in Clearing; events are used for state transitions */ |
1010 | if (peer->status != Clearing) | |
2158ad23 PJ |
1011 | { |
1012 | /* Delete all existing events of the peer */ | |
1013 | BGP_EVENT_FLUSH (peer); | |
1014 | } | |
dcdf399f | 1015 | |
718e3744 | 1016 | /* Increment Dropped count. */ |
1017 | if (peer->status == Established) | |
1018 | { | |
718e3744 | 1019 | peer->dropped++; |
848973c7 | 1020 | |
1021 | /* bgp log-neighbor-changes of neighbor Down */ | |
1022 | if (bgp_flag_check (peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) | |
c22767d8 DS |
1023 | { |
1024 | struct vrf *vrf = vrf_lookup_by_id (peer->bgp->vrf_id); | |
1025 | zlog_info ("%%ADJCHANGE: neighbor %s(%s) in vrf %s Down %s", | |
1026 | peer->host, | |
1027 | (peer->hostname) ? peer->hostname : "Unknown", | |
2e37f307 | 1028 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) ? vrf->name : "Default") : "", |
c22767d8 DS |
1029 | peer_down_str [(int) peer->last_reset]); |
1030 | } | |
848973c7 | 1031 | |
93406d87 | 1032 | /* graceful restart */ |
1033 | if (peer->t_gr_stale) | |
1034 | { | |
1035 | BGP_TIMER_OFF (peer->t_gr_stale); | |
16286195 | 1036 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 1037 | zlog_debug ("%s graceful restart stalepath timer stopped", peer->host); |
1038 | } | |
1039 | if (CHECK_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT)) | |
1040 | { | |
16286195 | 1041 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 1042 | { |
1043 | zlog_debug ("%s graceful restart timer started for %d sec", | |
1044 | peer->host, peer->v_gr_restart); | |
1045 | zlog_debug ("%s graceful restart stalepath timer started for %d sec", | |
1046 | peer->host, peer->bgp->stalepath_time); | |
1047 | } | |
1048 | BGP_TIMER_ON (peer->t_gr_restart, bgp_graceful_restart_timer_expire, | |
1049 | peer->v_gr_restart); | |
1050 | BGP_TIMER_ON (peer->t_gr_stale, bgp_graceful_stale_timer_expire, | |
1051 | peer->bgp->stalepath_time); | |
1052 | } | |
1053 | else | |
1054 | { | |
1055 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_MODE); | |
1056 | ||
1057 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
4d5b4f7b | 1058 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_4 ; safi++) |
93406d87 | 1059 | peer->nsf[afi][safi] = 0; |
1060 | } | |
1061 | ||
848973c7 | 1062 | /* set last reset time */ |
65957886 | 1063 | peer->resettime = peer->uptime = bgp_clock (); |
848973c7 | 1064 | |
3f9c7369 DS |
1065 | if (BGP_DEBUG (update_groups, UPDATE_GROUPS)) |
1066 | zlog_debug ("%s remove from all update group", peer->host); | |
1067 | update_group_remove_peer_afs(peer); | |
1068 | ||
3012671f | 1069 | hook_call(peer_backward_transition, peer); |
718e3744 | 1070 | |
f418446b | 1071 | /* Reset peer synctime */ |
1072 | peer->synctime = 0; | |
c43ed2e4 DS |
1073 | |
1074 | bgp_bfd_deregister_peer(peer); | |
538621f2 | 1075 | } |
718e3744 | 1076 | |
1077 | /* Stop read and write threads when exists. */ | |
1078 | BGP_READ_OFF (peer->t_read); | |
1079 | BGP_WRITE_OFF (peer->t_write); | |
1080 | ||
1081 | /* Stop all timers. */ | |
1082 | BGP_TIMER_OFF (peer->t_start); | |
1083 | BGP_TIMER_OFF (peer->t_connect); | |
1084 | BGP_TIMER_OFF (peer->t_holdtime); | |
1085 | BGP_TIMER_OFF (peer->t_keepalive); | |
718e3744 | 1086 | BGP_TIMER_OFF (peer->t_routeadv); |
1087 | ||
718e3744 | 1088 | /* Stream reset. */ |
1089 | peer->packet_size = 0; | |
1090 | ||
1091 | /* Clear input and output buffer. */ | |
1092 | if (peer->ibuf) | |
1093 | stream_reset (peer->ibuf); | |
1094 | if (peer->work) | |
1095 | stream_reset (peer->work); | |
200df115 | 1096 | if (peer->obuf) |
1097 | stream_fifo_clean (peer->obuf); | |
718e3744 | 1098 | |
eb821189 | 1099 | /* Close of file descriptor. */ |
1100 | if (peer->fd >= 0) | |
1101 | { | |
1102 | close (peer->fd); | |
1103 | peer->fd = -1; | |
1104 | } | |
718e3744 | 1105 | |
718e3744 | 1106 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) |
1107 | for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++) | |
1108 | { | |
538621f2 | 1109 | /* Reset all negotiated variables */ |
1110 | peer->afc_nego[afi][safi] = 0; | |
1111 | peer->afc_adv[afi][safi] = 0; | |
1112 | peer->afc_recv[afi][safi] = 0; | |
1113 | ||
718e3744 | 1114 | /* peer address family capability flags*/ |
1115 | peer->af_cap[afi][safi] = 0; | |
538621f2 | 1116 | |
718e3744 | 1117 | /* peer address family status flags*/ |
1118 | peer->af_sflags[afi][safi] = 0; | |
538621f2 | 1119 | |
718e3744 | 1120 | /* Received ORF prefix-filter */ |
1121 | peer->orf_plist[afi][safi] = NULL; | |
538621f2 | 1122 | |
1ff9a340 DS |
1123 | if ((peer->status == OpenConfirm) || (peer->status == Established)) { |
1124 | /* ORF received prefix-filter pnt */ | |
1125 | sprintf (orf_name, "%s.%d.%d", peer->host, afi, safi); | |
c7da3d50 | 1126 | prefix_bgp_orf_remove_all (afi, orf_name); |
1ff9a340 | 1127 | } |
718e3744 | 1128 | } |
1129 | ||
1130 | /* Reset keepalive and holdtime */ | |
1131 | if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER)) | |
1132 | { | |
1133 | peer->v_keepalive = peer->keepalive; | |
1134 | peer->v_holdtime = peer->holdtime; | |
1135 | } | |
1136 | else | |
1137 | { | |
1138 | peer->v_keepalive = peer->bgp->default_keepalive; | |
1139 | peer->v_holdtime = peer->bgp->default_holdtime; | |
1140 | } | |
1141 | ||
1142 | peer->update_time = 0; | |
1143 | ||
1144 | /* Until we are sure that there is no problem about prefix count | |
1145 | this should be commented out.*/ | |
1146 | #if 0 | |
1147 | /* Reset prefix count */ | |
1148 | peer->pcount[AFI_IP][SAFI_UNICAST] = 0; | |
1149 | peer->pcount[AFI_IP][SAFI_MULTICAST] = 0; | |
cd1964ff | 1150 | peer->pcount[AFI_IP][SAFI_LABELED_UNICAST] = 0; |
718e3744 | 1151 | peer->pcount[AFI_IP][SAFI_MPLS_VPN] = 0; |
1152 | peer->pcount[AFI_IP6][SAFI_UNICAST] = 0; | |
1153 | peer->pcount[AFI_IP6][SAFI_MULTICAST] = 0; | |
cd1964ff | 1154 | peer->pcount[AFI_IP6][SAFI_LABELED_UNICAST] = 0; |
718e3744 | 1155 | #endif /* 0 */ |
1156 | ||
1ff9a340 DS |
1157 | if (!CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE) && |
1158 | !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) | |
1159 | { | |
1160 | peer_delete(peer); | |
1161 | ret = -1; | |
1162 | } | |
a80beece DS |
1163 | else |
1164 | { | |
1165 | bgp_peer_conf_if_to_su_update(peer); | |
1166 | } | |
1ff9a340 DS |
1167 | |
1168 | return ret; | |
718e3744 | 1169 | } |
1170 | ||
1171 | /* BGP peer is stoped by the error. */ | |
94f2b392 | 1172 | static int |
718e3744 | 1173 | bgp_stop_with_error (struct peer *peer) |
1174 | { | |
1175 | /* Double start timer. */ | |
1176 | peer->v_start *= 2; | |
1177 | ||
1178 | /* Overflow check. */ | |
1179 | if (peer->v_start >= (60 * 2)) | |
1180 | peer->v_start = (60 * 2); | |
1181 | ||
f14e6fdb DS |
1182 | if (peer_dynamic_neighbor(peer)) |
1183 | { | |
1184 | if (bgp_debug_neighbor_events(peer)) | |
1185 | zlog_debug ("%s (dynamic neighbor) deleted", peer->host); | |
1186 | peer_delete (peer); | |
1187 | return -1; | |
1188 | } | |
1189 | ||
1ff9a340 | 1190 | return(bgp_stop (peer)); |
718e3744 | 1191 | } |
1192 | ||
397b5bde LR |
1193 | |
1194 | /* something went wrong, send notify and tear down */ | |
1195 | static int | |
1196 | bgp_stop_with_notify (struct peer *peer, u_char code, u_char sub_code) | |
1197 | { | |
1198 | /* Send notify to remote peer */ | |
1199 | bgp_notify_send (peer, code, sub_code); | |
1200 | ||
f14e6fdb DS |
1201 | if (peer_dynamic_neighbor(peer)) |
1202 | { | |
1203 | if (bgp_debug_neighbor_events(peer)) | |
1204 | zlog_debug ("%s (dynamic neighbor) deleted", peer->host); | |
1205 | peer_delete (peer); | |
1206 | return -1; | |
1207 | } | |
1208 | ||
397b5bde LR |
1209 | /* Clear start timer value to default. */ |
1210 | peer->v_start = BGP_INIT_START_TIMER; | |
1211 | ||
1ff9a340 | 1212 | return(bgp_stop(peer)); |
397b5bde LR |
1213 | } |
1214 | ||
1215 | ||
718e3744 | 1216 | /* TCP connection open. Next we send open message to remote peer. And |
1217 | add read thread for reading open message. */ | |
94f2b392 | 1218 | static int |
718e3744 | 1219 | bgp_connect_success (struct peer *peer) |
1220 | { | |
eb821189 | 1221 | if (peer->fd < 0) |
718e3744 | 1222 | { |
1223 | zlog_err ("bgp_connect_success peer's fd is negative value %d", | |
eb821189 | 1224 | peer->fd); |
1ff9a340 | 1225 | bgp_stop(peer); |
718e3744 | 1226 | return -1; |
1227 | } | |
718e3744 | 1228 | |
1ff9a340 DS |
1229 | if (bgp_getsockname (peer) < 0) |
1230 | { | |
5b6dc0dd DS |
1231 | zlog_err ("%s: bgp_getsockname(): failed for peer %s, fd %d", __FUNCTION__, |
1232 | peer->host, peer->fd); | |
1ff9a340 DS |
1233 | bgp_notify_send(peer, BGP_NOTIFY_FSM_ERR, 0); /* internal error */ |
1234 | return -1; | |
1235 | } | |
1236 | ||
1237 | BGP_READ_ON (peer->t_read, bgp_read, peer->fd); | |
f418446b | 1238 | |
16286195 | 1239 | if (bgp_debug_neighbor_events(peer)) |
f418446b | 1240 | { |
682ca04c JBD |
1241 | char buf1[SU_ADDRSTRLEN]; |
1242 | ||
f418446b | 1243 | if (! CHECK_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
1244 | zlog_debug ("%s open active, local address %s", peer->host, | |
1245 | sockunion2str (peer->su_local, buf1, SU_ADDRSTRLEN)); | |
1246 | else | |
1247 | zlog_debug ("%s passive open", peer->host); | |
1248 | } | |
718e3744 | 1249 | |
1ff9a340 | 1250 | bgp_open_send (peer); |
718e3744 | 1251 | |
1252 | return 0; | |
1253 | } | |
1254 | ||
1255 | /* TCP connect fail */ | |
94f2b392 | 1256 | static int |
718e3744 | 1257 | bgp_connect_fail (struct peer *peer) |
1258 | { | |
f14e6fdb DS |
1259 | if (peer_dynamic_neighbor(peer)) |
1260 | { | |
1261 | if (bgp_debug_neighbor_events(peer)) | |
1262 | zlog_debug ("%s (dynamic neighbor) deleted", peer->host); | |
1263 | peer_delete (peer); | |
1264 | return -1; | |
1265 | } | |
1266 | ||
1ff9a340 | 1267 | return (bgp_stop (peer)); |
718e3744 | 1268 | } |
1269 | ||
1270 | /* This function is the first starting point of all BGP connection. It | |
1271 | try to connect to remote peer with non-blocking IO. */ | |
1272 | int | |
1273 | bgp_start (struct peer *peer) | |
1274 | { | |
1275 | int status; | |
fc9a856f | 1276 | int connected = 0; |
718e3744 | 1277 | |
a80beece DS |
1278 | bgp_peer_conf_if_to_su_update(peer); |
1279 | ||
085567f9 | 1280 | if (peer->su.sa.sa_family == AF_UNSPEC) |
1281 | { | |
1282 | if (bgp_debug_neighbor_events(peer)) | |
1283 | zlog_debug ("%s [FSM] Unable to get neighbor's IP address, waiting...", | |
1284 | peer->host); | |
1285 | return -1; | |
1286 | } | |
1287 | ||
ca058a30 PJ |
1288 | if (BGP_PEER_START_SUPPRESSED (peer)) |
1289 | { | |
16286195 DS |
1290 | if (bgp_debug_neighbor_events(peer)) |
1291 | zlog_err ("%s [FSM] Trying to start suppressed peer" | |
ca058a30 PJ |
1292 | " - this is never supposed to happen!", peer->host); |
1293 | return -1; | |
1294 | } | |
1295 | ||
33d5ab9e PJ |
1296 | /* Scrub some information that might be left over from a previous, |
1297 | * session | |
1298 | */ | |
1299 | /* Connection information. */ | |
1300 | if (peer->su_local) | |
1301 | { | |
1302 | sockunion_free (peer->su_local); | |
1303 | peer->su_local = NULL; | |
1304 | } | |
1305 | ||
1306 | if (peer->su_remote) | |
1307 | { | |
1308 | sockunion_free (peer->su_remote); | |
1309 | peer->su_remote = NULL; | |
1310 | } | |
1311 | ||
1312 | /* Clear remote router-id. */ | |
1313 | peer->remote_id.s_addr = 0; | |
1314 | ||
1315 | /* Clear peer capability flag. */ | |
1316 | peer->cap = 0; | |
1317 | ||
718e3744 | 1318 | /* If the peer is passive mode, force to move to Active mode. */ |
1319 | if (CHECK_FLAG (peer->flags, PEER_FLAG_PASSIVE)) | |
1320 | { | |
1321 | BGP_EVENT_ADD (peer, TCP_connection_open_failed); | |
1322 | return 0; | |
1323 | } | |
1324 | ||
fc9a856f | 1325 | /* Register to be notified on peer up */ |
c5a5c4ff DS |
1326 | if (peer->sort == BGP_PEER_EBGP && peer->ttl == 1 && |
1327 | ! CHECK_FLAG (peer->flags, PEER_FLAG_DISABLE_CONNECTED_CHECK) | |
1328 | && ! bgp_flag_check(peer->bgp, BGP_FLAG_DISABLE_NH_CONNECTED_CHK)) | |
fc9a856f | 1329 | connected = 1; |
c5a5c4ff DS |
1330 | else |
1331 | connected = 0; | |
fc9a856f | 1332 | |
65740e1b DS |
1333 | if (!bgp_find_or_add_nexthop(peer->bgp, family2afi(peer->su.sa.sa_family), |
1334 | NULL, peer, connected)) | |
1335 | { | |
4d41dd8b | 1336 | #if defined (HAVE_CUMULUS) |
65740e1b | 1337 | if (bgp_debug_neighbor_events(peer)) |
c5a5c4ff DS |
1338 | zlog_debug ("%s [FSM] Waiting for NHT", peer->host); |
1339 | ||
1340 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
65740e1b | 1341 | return 0; |
b5826a12 | 1342 | #endif |
65740e1b DS |
1343 | } |
1344 | ||
718e3744 | 1345 | status = bgp_connect (peer); |
1346 | ||
1347 | switch (status) | |
1348 | { | |
1349 | case connect_error: | |
16286195 DS |
1350 | if (bgp_debug_neighbor_events(peer)) |
1351 | zlog_debug ("%s [FSM] Connect error", peer->host); | |
718e3744 | 1352 | BGP_EVENT_ADD (peer, TCP_connection_open_failed); |
1353 | break; | |
1354 | case connect_success: | |
16286195 | 1355 | if (bgp_debug_neighbor_events(peer)) |
5b6dc0dd DS |
1356 | zlog_debug ("%s [FSM] Connect immediately success, fd %d", |
1357 | peer->host, peer->fd); | |
718e3744 | 1358 | BGP_EVENT_ADD (peer, TCP_connection_open); |
1359 | break; | |
1360 | case connect_in_progress: | |
1361 | /* To check nonblocking connect, we wait until socket is | |
1362 | readable or writable. */ | |
16286195 | 1363 | if (bgp_debug_neighbor_events(peer)) |
5b6dc0dd DS |
1364 | zlog_debug ("%s [FSM] Non blocking connect waiting result, fd %d", |
1365 | peer->host, peer->fd); | |
eb821189 | 1366 | if (peer->fd < 0) |
718e3744 | 1367 | { |
1368 | zlog_err ("bgp_start peer's fd is negative value %d", | |
eb821189 | 1369 | peer->fd); |
718e3744 | 1370 | return -1; |
1371 | } | |
eb821189 | 1372 | BGP_READ_ON (peer->t_read, bgp_read, peer->fd); |
1373 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); | |
718e3744 | 1374 | break; |
1375 | } | |
1376 | return 0; | |
1377 | } | |
1378 | ||
1379 | /* Connect retry timer is expired when the peer status is Connect. */ | |
94f2b392 | 1380 | static int |
718e3744 | 1381 | bgp_reconnect (struct peer *peer) |
1382 | { | |
fb98973a DS |
1383 | if (bgp_stop (peer) < 0) |
1384 | return -1; | |
1ff9a340 | 1385 | |
fb98973a DS |
1386 | bgp_start (peer); |
1387 | return 0; | |
718e3744 | 1388 | } |
1389 | ||
94f2b392 | 1390 | static int |
718e3744 | 1391 | bgp_fsm_open (struct peer *peer) |
1392 | { | |
1393 | /* Send keepalive and make keepalive timer */ | |
1394 | bgp_keepalive_send (peer); | |
1395 | ||
1396 | /* Reset holdtimer value. */ | |
1397 | BGP_TIMER_OFF (peer->t_holdtime); | |
1398 | ||
1399 | return 0; | |
1400 | } | |
1401 | ||
718e3744 | 1402 | /* Keepalive send to peer. */ |
94f2b392 | 1403 | static int |
718e3744 | 1404 | bgp_fsm_keepalive_expire (struct peer *peer) |
1405 | { | |
1406 | bgp_keepalive_send (peer); | |
1407 | return 0; | |
1408 | } | |
1409 | ||
397b5bde LR |
1410 | /* FSM error, unexpected event. This is error of BGP connection. So cut the |
1411 | peer and change to Idle status. */ | |
1412 | static int | |
1413 | bgp_fsm_event_error (struct peer *peer) | |
1414 | { | |
16286195 | 1415 | zlog_err ("%s [FSM] unexpected packet received in state %s", |
56b40679 | 1416 | peer->host, lookup_msg(bgp_status_msg, peer->status, NULL)); |
397b5bde LR |
1417 | |
1418 | return bgp_stop_with_notify (peer, BGP_NOTIFY_FSM_ERR, 0); | |
1419 | } | |
1420 | ||
718e3744 | 1421 | /* Hold timer expire. This is error of BGP connection. So cut the |
1422 | peer and change to Idle status. */ | |
94f2b392 | 1423 | static int |
718e3744 | 1424 | bgp_fsm_holdtime_expire (struct peer *peer) |
1425 | { | |
16286195 DS |
1426 | if (bgp_debug_neighbor_events(peer)) |
1427 | zlog_debug ("%s [FSM] Hold timer expire", peer->host); | |
718e3744 | 1428 | |
397b5bde | 1429 | return bgp_stop_with_notify (peer, BGP_NOTIFY_HOLD_ERR, 0); |
718e3744 | 1430 | } |
1431 | ||
1432 | /* Status goes to Established. Send keepalive packet then make first | |
1433 | update information. */ | |
94f2b392 | 1434 | static int |
718e3744 | 1435 | bgp_establish (struct peer *peer) |
1436 | { | |
718e3744 | 1437 | afi_t afi; |
1438 | safi_t safi; | |
93406d87 | 1439 | int nsf_af_count = 0; |
1ff9a340 DS |
1440 | int ret = 0; |
1441 | struct peer *other; | |
1442 | ||
1443 | other = peer->doppelganger; | |
1444 | peer = peer_xfer_conn(peer); | |
1445 | if (!peer) | |
1446 | { | |
1447 | zlog_err ("%%Neighbor failed in xfer_conn"); | |
1448 | return -1; | |
1449 | } | |
1450 | ||
1451 | if (other == peer) | |
1452 | ret = 1; /* bgp_establish specific code when xfer_conn happens. */ | |
718e3744 | 1453 | |
1454 | /* Reset capability open status flag. */ | |
1455 | if (! CHECK_FLAG (peer->sflags, PEER_STATUS_CAPABILITY_OPEN)) | |
1456 | SET_FLAG (peer->sflags, PEER_STATUS_CAPABILITY_OPEN); | |
1457 | ||
718e3744 | 1458 | /* Clear start timer value to default. */ |
1459 | peer->v_start = BGP_INIT_START_TIMER; | |
1460 | ||
1461 | /* Increment established count. */ | |
1462 | peer->established++; | |
1463 | bgp_fsm_change_status (peer, Established); | |
848973c7 | 1464 | |
1465 | /* bgp log-neighbor-changes of neighbor Up */ | |
1466 | if (bgp_flag_check (peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) | |
c22767d8 DS |
1467 | { |
1468 | struct vrf *vrf = vrf_lookup_by_id (peer->bgp->vrf_id); | |
1469 | zlog_info ("%%ADJCHANGE: neighbor %s(%s) in vrf %s Up", | |
1470 | peer->host, | |
1471 | (peer->hostname) ? peer->hostname : "Unknown", | |
c2f61344 | 1472 | vrf ? ((vrf->vrf_id != VRF_DEFAULT ) ? vrf->name : "Default") : ""); |
c22767d8 | 1473 | } |
3f9c7369 DS |
1474 | /* assign update-group/subgroup */ |
1475 | update_group_adjust_peer_afs(peer); | |
1476 | ||
93406d87 | 1477 | /* graceful restart */ |
1478 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT); | |
1479 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
4d5b4f7b | 1480 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_4 ; safi++) |
93406d87 | 1481 | { |
1482 | if (peer->afc_nego[afi][safi] | |
1483 | && CHECK_FLAG (peer->cap, PEER_CAP_RESTART_ADV) | |
1484 | && CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_RESTART_AF_RCV)) | |
1485 | { | |
1486 | if (peer->nsf[afi][safi] | |
1487 | && ! CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_RESTART_AF_PRESERVE_RCV)) | |
1488 | bgp_clear_stale_route (peer, afi, safi); | |
1489 | ||
1490 | peer->nsf[afi][safi] = 1; | |
1491 | nsf_af_count++; | |
1492 | } | |
1493 | else | |
1494 | { | |
1495 | if (peer->nsf[afi][safi]) | |
1496 | bgp_clear_stale_route (peer, afi, safi); | |
1497 | peer->nsf[afi][safi] = 0; | |
1498 | } | |
1499 | } | |
1500 | ||
1501 | if (nsf_af_count) | |
1502 | SET_FLAG (peer->sflags, PEER_STATUS_NSF_MODE); | |
1503 | else | |
1504 | { | |
1505 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_MODE); | |
1506 | if (peer->t_gr_stale) | |
1507 | { | |
1508 | BGP_TIMER_OFF (peer->t_gr_stale); | |
16286195 | 1509 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 1510 | zlog_debug ("%s graceful restart stalepath timer stopped", peer->host); |
1511 | } | |
1512 | } | |
1513 | ||
1514 | if (peer->t_gr_restart) | |
1515 | { | |
1516 | BGP_TIMER_OFF (peer->t_gr_restart); | |
16286195 | 1517 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 1518 | zlog_debug ("%s graceful restart timer stopped", peer->host); |
1519 | } | |
1520 | ||
3012671f | 1521 | hook_call(peer_established, peer); |
718e3744 | 1522 | |
1523 | /* Reset uptime, send keepalive, send current table. */ | |
65957886 | 1524 | peer->uptime = bgp_clock (); |
718e3744 | 1525 | |
1526 | /* Send route-refresh when ORF is enabled */ | |
1527 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
1528 | for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++) | |
1529 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_SM_ADV)) | |
1530 | { | |
1531 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_RM_RCV)) | |
1532 | bgp_route_refresh_send (peer, afi, safi, ORF_TYPE_PREFIX, | |
1533 | REFRESH_IMMEDIATE, 0); | |
1534 | else if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_RM_OLD_RCV)) | |
1535 | bgp_route_refresh_send (peer, afi, safi, ORF_TYPE_PREFIX_OLD, | |
1536 | REFRESH_IMMEDIATE, 0); | |
1537 | } | |
1538 | ||
718e3744 | 1539 | /* First update is deferred until ORF or ROUTE-REFRESH is received */ |
1540 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
1541 | for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++) | |
1542 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_RM_ADV)) | |
1543 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_SM_RCV) | |
1544 | || CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_SM_OLD_RCV)) | |
1545 | SET_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_ORF_WAIT_REFRESH); | |
1546 | ||
3f9c7369 | 1547 | bgp_announce_peer (peer); |
718e3744 | 1548 | |
cb1faec9 DS |
1549 | /* Start the route advertisement timer to send updates to the peer - if BGP |
1550 | * is not in read-only mode. If it is, the timer will be started at the end | |
1551 | * of read-only mode. | |
1552 | */ | |
1553 | if (!bgp_update_delay_active(peer->bgp)) | |
3f9c7369 DS |
1554 | { |
1555 | BGP_TIMER_OFF(peer->t_routeadv); | |
1556 | BGP_TIMER_ON (peer->t_routeadv, bgp_routeadv_timer, 0); | |
1557 | } | |
718e3744 | 1558 | |
1ff9a340 DS |
1559 | if (peer->doppelganger && (peer->doppelganger->status != Deleted)) |
1560 | { | |
16286195 | 1561 | if (bgp_debug_neighbor_events(peer)) |
1ff9a340 DS |
1562 | zlog_debug("[Event] Deleting stub connection for peer %s", peer->host); |
1563 | ||
1564 | if (peer->doppelganger->status > Active) | |
1565 | bgp_notify_send (peer->doppelganger, BGP_NOTIFY_CEASE, | |
1566 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
1567 | else | |
1568 | peer_delete(peer->doppelganger); | |
1569 | } | |
1570 | ||
c43ed2e4 | 1571 | bgp_bfd_register_peer(peer); |
1ff9a340 | 1572 | return ret; |
718e3744 | 1573 | } |
1574 | ||
1575 | /* Keepalive packet is received. */ | |
94f2b392 | 1576 | static int |
718e3744 | 1577 | bgp_fsm_keepalive (struct peer *peer) |
1578 | { | |
f188f2c4 DS |
1579 | bgp_update_implicit_eors(peer); |
1580 | ||
718e3744 | 1581 | /* peer count update */ |
1582 | peer->keepalive_in++; | |
1583 | ||
1584 | BGP_TIMER_OFF (peer->t_holdtime); | |
1585 | return 0; | |
1586 | } | |
1587 | ||
1588 | /* Update packet is received. */ | |
94f2b392 | 1589 | static int |
718e3744 | 1590 | bgp_fsm_update (struct peer *peer) |
1591 | { | |
1592 | BGP_TIMER_OFF (peer->t_holdtime); | |
1593 | return 0; | |
1594 | } | |
1595 | ||
1596 | /* This is empty event. */ | |
94f2b392 | 1597 | static int |
718e3744 | 1598 | bgp_ignore (struct peer *peer) |
1599 | { | |
5b6dc0dd | 1600 | zlog_err ("%s [FSM] Ignoring event %s in state %s, prior events %s, %s, fd %d", |
6403814c | 1601 | peer->host, bgp_event_str[peer->cur_event], |
56b40679 | 1602 | lookup_msg(bgp_status_msg, peer->status, NULL), |
6403814c | 1603 | bgp_event_str[peer->last_event], |
5b6dc0dd | 1604 | bgp_event_str[peer->last_major_event], peer->fd); |
718e3744 | 1605 | return 0; |
1606 | } | |
6b0655a2 | 1607 | |
6403814c DS |
1608 | /* This is to handle unexpected events.. */ |
1609 | static int | |
1610 | bgp_fsm_exeption (struct peer *peer) | |
1611 | { | |
5b6dc0dd | 1612 | zlog_err ("%s [FSM] Unexpected event %s in state %s, prior events %s, %s, fd %d", |
6403814c | 1613 | peer->host, bgp_event_str[peer->cur_event], |
56b40679 | 1614 | lookup_msg(bgp_status_msg, peer->status, NULL), |
6403814c | 1615 | bgp_event_str[peer->last_event], |
5b6dc0dd | 1616 | bgp_event_str[peer->last_major_event], peer->fd); |
6403814c DS |
1617 | return(bgp_stop (peer)); |
1618 | } | |
1619 | ||
fc9a856f DS |
1620 | void |
1621 | bgp_fsm_nht_update(struct peer *peer, int valid) | |
1622 | { | |
fc9a856f DS |
1623 | if (!peer) |
1624 | return; | |
1625 | ||
1626 | switch (peer->status) | |
1627 | { | |
1628 | case Idle: | |
1629 | if (valid) | |
1630 | BGP_EVENT_ADD(peer, BGP_Start); | |
1631 | break; | |
1632 | case Connect: | |
c5a5c4ff | 1633 | if (!valid) |
fc9a856f DS |
1634 | { |
1635 | BGP_TIMER_OFF(peer->t_connect); | |
c5a5c4ff | 1636 | BGP_EVENT_ADD(peer, TCP_fatal_error); |
fc9a856f DS |
1637 | } |
1638 | break; | |
1639 | case Active: | |
1640 | if (valid) | |
1641 | { | |
1642 | BGP_TIMER_OFF(peer->t_connect); | |
1643 | BGP_EVENT_ADD(peer, ConnectRetry_timer_expired); | |
1644 | } | |
c5a5c4ff | 1645 | break; |
fc9a856f DS |
1646 | case OpenSent: |
1647 | case OpenConfirm: | |
1648 | case Established: | |
c5a5c4ff DS |
1649 | if (!valid && (peer->gtsm_hops == 1)) |
1650 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
fc9a856f DS |
1651 | case Clearing: |
1652 | case Deleted: | |
1653 | default: | |
1654 | break; | |
1655 | } | |
1656 | } | |
1657 | ||
1658 | ||
718e3744 | 1659 | /* Finite State Machine structure */ |
fda1d3e0 | 1660 | static const struct { |
66e5cd87 | 1661 | int (*func) (struct peer *); |
718e3744 | 1662 | int next_state; |
1663 | } FSM [BGP_STATUS_MAX - 1][BGP_EVENTS_MAX - 1] = | |
1664 | { | |
1665 | { | |
1666 | /* Idle state: In Idle state, all events other than BGP_Start is | |
1667 | ignored. With BGP_Start event, finite state machine calls | |
1668 | bgp_start(). */ | |
1669 | {bgp_start, Connect}, /* BGP_Start */ | |
1670 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1671 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1672 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1673 | {bgp_ignore, Idle}, /* TCP_connection_open_failed */ | |
1674 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1675 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ | |
1676 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
1677 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
1678 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
1679 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
1680 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
1681 | {bgp_ignore, Idle}, /* Receive_NOTIFICATION_message */ | |
ca058a30 | 1682 | {bgp_ignore, Idle}, /* Clearing_Completed */ |
718e3744 | 1683 | }, |
1684 | { | |
1685 | /* Connect */ | |
1686 | {bgp_ignore, Connect}, /* BGP_Start */ | |
1687 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1688 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1689 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1690 | {bgp_connect_fail, Active}, /* TCP_connection_open_failed */ | |
1691 | {bgp_connect_fail, Idle}, /* TCP_fatal_error */ | |
1692 | {bgp_reconnect, Connect}, /* ConnectRetry_timer_expired */ | |
6403814c DS |
1693 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ |
1694 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1695 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1696 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
1697 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
718e3744 | 1698 | {bgp_stop, Idle}, /* Receive_NOTIFICATION_message */ |
6403814c | 1699 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ |
718e3744 | 1700 | }, |
1701 | { | |
1702 | /* Active, */ | |
1703 | {bgp_ignore, Active}, /* BGP_Start */ | |
1704 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1705 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1706 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1707 | {bgp_ignore, Active}, /* TCP_connection_open_failed */ | |
6403814c | 1708 | {bgp_fsm_exeption, Idle}, /* TCP_fatal_error */ |
718e3744 | 1709 | {bgp_start, Connect}, /* ConnectRetry_timer_expired */ |
6403814c DS |
1710 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ |
1711 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1712 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1713 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
1714 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1715 | {bgp_fsm_exeption, Idle}, /* Receive_NOTIFICATION_message */ | |
1716 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
718e3744 | 1717 | }, |
1718 | { | |
1719 | /* OpenSent, */ | |
1720 | {bgp_ignore, OpenSent}, /* BGP_Start */ | |
1721 | {bgp_stop, Idle}, /* BGP_Stop */ | |
536792cd | 1722 | {bgp_stop, Active}, /* TCP_connection_open */ |
718e3744 | 1723 | {bgp_stop, Active}, /* TCP_connection_closed */ |
536792cd PJ |
1724 | {bgp_stop, Active}, /* TCP_connection_open_failed */ |
1725 | {bgp_stop, Active}, /* TCP_fatal_error */ | |
6403814c | 1726 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ |
718e3744 | 1727 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ |
6403814c | 1728 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ |
718e3744 | 1729 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ |
397b5bde LR |
1730 | {bgp_fsm_event_error, Idle}, /* Receive_KEEPALIVE_message */ |
1731 | {bgp_fsm_event_error, Idle}, /* Receive_UPDATE_message */ | |
718e3744 | 1732 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ |
6403814c | 1733 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ |
718e3744 | 1734 | }, |
1735 | { | |
1736 | /* OpenConfirm, */ | |
1737 | {bgp_ignore, OpenConfirm}, /* BGP_Start */ | |
1738 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1739 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1740 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1741 | {bgp_stop, Idle}, /* TCP_connection_open_failed */ | |
1742 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
6403814c | 1743 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ |
718e3744 | 1744 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ |
1745 | {bgp_ignore, OpenConfirm}, /* KeepAlive_timer_expired */ | |
6403814c | 1746 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ |
718e3744 | 1747 | {bgp_establish, Established}, /* Receive_KEEPALIVE_message */ |
6403814c | 1748 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ |
718e3744 | 1749 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ |
6403814c | 1750 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ |
718e3744 | 1751 | }, |
1752 | { | |
1753 | /* Established, */ | |
ca058a30 PJ |
1754 | {bgp_ignore, Established}, /* BGP_Start */ |
1755 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
1756 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1757 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
3117b5c4 | 1758 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ |
ca058a30 | 1759 | {bgp_stop, Clearing}, /* TCP_fatal_error */ |
3117b5c4 | 1760 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ |
ca058a30 | 1761 | {bgp_fsm_holdtime_expire, Clearing}, /* Hold_Timer_expired */ |
718e3744 | 1762 | {bgp_fsm_keepalive_expire, Established}, /* KeepAlive_timer_expired */ |
ca058a30 PJ |
1763 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ |
1764 | {bgp_fsm_keepalive, Established}, /* Receive_KEEPALIVE_message */ | |
1765 | {bgp_fsm_update, Established}, /* Receive_UPDATE_message */ | |
1766 | {bgp_stop_with_error, Clearing}, /* Receive_NOTIFICATION_message */ | |
6403814c | 1767 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ |
ca058a30 PJ |
1768 | }, |
1769 | { | |
1770 | /* Clearing, */ | |
1771 | {bgp_ignore, Clearing}, /* BGP_Start */ | |
3117b5c4 SH |
1772 | {bgp_stop, Clearing}, /* BGP_Stop */ |
1773 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1774 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
1775 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
1776 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
1777 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
1778 | {bgp_stop, Clearing}, /* Hold_Timer_expired */ | |
1779 | {bgp_stop, Clearing}, /* KeepAlive_timer_expired */ | |
1780 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
1781 | {bgp_stop, Clearing}, /* Receive_KEEPALIVE_message */ | |
1782 | {bgp_stop, Clearing}, /* Receive_UPDATE_message */ | |
1783 | {bgp_stop, Clearing}, /* Receive_NOTIFICATION_message */ | |
1784 | {bgp_clearing_completed, Idle}, /* Clearing_Completed */ | |
ca058a30 PJ |
1785 | }, |
1786 | { | |
1787 | /* Deleted, */ | |
1788 | {bgp_ignore, Deleted}, /* BGP_Start */ | |
1789 | {bgp_ignore, Deleted}, /* BGP_Stop */ | |
1790 | {bgp_ignore, Deleted}, /* TCP_connection_open */ | |
1791 | {bgp_ignore, Deleted}, /* TCP_connection_closed */ | |
1792 | {bgp_ignore, Deleted}, /* TCP_connection_open_failed */ | |
1793 | {bgp_ignore, Deleted}, /* TCP_fatal_error */ | |
1794 | {bgp_ignore, Deleted}, /* ConnectRetry_timer_expired */ | |
1795 | {bgp_ignore, Deleted}, /* Hold_Timer_expired */ | |
1796 | {bgp_ignore, Deleted}, /* KeepAlive_timer_expired */ | |
1797 | {bgp_ignore, Deleted}, /* Receive_OPEN_message */ | |
1798 | {bgp_ignore, Deleted}, /* Receive_KEEPALIVE_message */ | |
1799 | {bgp_ignore, Deleted}, /* Receive_UPDATE_message */ | |
1800 | {bgp_ignore, Deleted}, /* Receive_NOTIFICATION_message */ | |
1801 | {bgp_ignore, Deleted}, /* Clearing_Completed */ | |
718e3744 | 1802 | }, |
1803 | }; | |
1804 | ||
718e3744 | 1805 | /* Execute event process. */ |
1806 | int | |
1807 | bgp_event (struct thread *thread) | |
1808 | { | |
718e3744 | 1809 | int event; |
718e3744 | 1810 | struct peer *peer; |
1ff9a340 | 1811 | int ret; |
718e3744 | 1812 | |
1813 | peer = THREAD_ARG (thread); | |
1814 | event = THREAD_VAL (thread); | |
1815 | ||
1ff9a340 DS |
1816 | ret = bgp_event_update(peer, event); |
1817 | ||
1818 | return (ret); | |
1819 | } | |
1820 | ||
1821 | int | |
1822 | bgp_event_update (struct peer *peer, int event) | |
1823 | { | |
1824 | int next; | |
1825 | int ret = 0; | |
1826 | struct peer *other; | |
1827 | int passive_conn = 0; | |
f14e6fdb | 1828 | int dyn_nbr; |
1ff9a340 DS |
1829 | |
1830 | other = peer->doppelganger; | |
1831 | passive_conn = (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) ? 1 : 0; | |
f14e6fdb | 1832 | dyn_nbr = peer_dynamic_neighbor(peer); |
1ff9a340 | 1833 | |
718e3744 | 1834 | /* Logging this event. */ |
1835 | next = FSM [peer->status -1][event - 1].next_state; | |
1836 | ||
16286195 | 1837 | if (bgp_debug_neighbor_events(peer) && peer->status != next) |
5b6dc0dd | 1838 | zlog_debug ("%s [FSM] %s (%s->%s), fd %d", peer->host, |
718e3744 | 1839 | bgp_event_str[event], |
56b40679 QY |
1840 | lookup_msg(bgp_status_msg, peer->status, NULL), |
1841 | lookup_msg(bgp_status_msg, next, NULL), peer->fd); | |
718e3744 | 1842 | |
6403814c DS |
1843 | peer->last_event = peer->cur_event; |
1844 | peer->cur_event = event; | |
1845 | ||
718e3744 | 1846 | /* Call function. */ |
ca058a30 PJ |
1847 | if (FSM [peer->status -1][event - 1].func) |
1848 | ret = (*(FSM [peer->status - 1][event - 1].func))(peer); | |
718e3744 | 1849 | |
1850 | /* When function do not want proceed next job return -1. */ | |
200df115 | 1851 | if (ret >= 0) |
1852 | { | |
1ff9a340 DS |
1853 | if (ret == 1 && next == Established) |
1854 | { | |
1855 | /* The case when doppelganger swap accurred in bgp_establish. | |
1856 | Update the peer pointer accordingly */ | |
1857 | peer = other; | |
1858 | } | |
1859 | ||
200df115 | 1860 | /* If status is changed. */ |
1861 | if (next != peer->status) | |
f2c31acb | 1862 | bgp_fsm_change_status (peer, next); |
95fdcd8a | 1863 | |
200df115 | 1864 | /* Make sure timer is set. */ |
1865 | bgp_timer_set (peer); | |
1ff9a340 DS |
1866 | |
1867 | } | |
f14e6fdb | 1868 | else if (!dyn_nbr && !passive_conn && peer->bgp) |
1ff9a340 DS |
1869 | { |
1870 | /* If we got a return value of -1, that means there was an error, restart | |
1871 | * the FSM. If the peer structure was deleted | |
1872 | */ | |
5b6dc0dd DS |
1873 | zlog_err ("%s [FSM] Failure handling event %s in state %s, " |
1874 | "prior events %s, %s, fd %d", | |
6403814c | 1875 | peer->host, bgp_event_str[peer->cur_event], |
56b40679 | 1876 | lookup_msg(bgp_status_msg, peer->status, NULL), |
6403814c | 1877 | bgp_event_str[peer->last_event], |
5b6dc0dd | 1878 | bgp_event_str[peer->last_major_event], peer->fd); |
6403814c | 1879 | bgp_stop (peer); |
1ff9a340 DS |
1880 | bgp_fsm_change_status(peer, Idle); |
1881 | bgp_timer_set(peer); | |
200df115 | 1882 | } |
200df115 | 1883 | return ret; |
718e3744 | 1884 | } |