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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" |
ffd0c037 | 50 | #include "bgpd/bgp_nht.h" |
c43ed2e4 | 51 | #include "bgpd/bgp_bfd.h" |
6b0655a2 | 52 | |
6403814c DS |
53 | /* Definition of display strings corresponding to FSM events. This should be |
54 | * kept consistent with the events defined in bgpd.h | |
55 | */ | |
56 | static const char *bgp_event_str[] = | |
57 | { | |
58 | NULL, | |
59 | "BGP_Start", | |
60 | "BGP_Stop", | |
61 | "TCP_connection_open", | |
62 | "TCP_connection_closed", | |
63 | "TCP_connection_open_failed", | |
64 | "TCP_fatal_error", | |
65 | "ConnectRetry_timer_expired", | |
66 | "Hold_Timer_expired", | |
67 | "KeepAlive_timer_expired", | |
68 | "Receive_OPEN_message", | |
69 | "Receive_KEEPALIVE_message", | |
70 | "Receive_UPDATE_message", | |
71 | "Receive_NOTIFICATION_message", | |
72 | "Clearing_Completed", | |
73 | }; | |
74 | ||
718e3744 | 75 | /* BGP FSM (finite state machine) has three types of functions. Type |
76 | one is thread functions. Type two is event functions. Type three | |
77 | is FSM functions. Timer functions are set by bgp_timer_set | |
78 | function. */ | |
79 | ||
80 | /* BGP event function. */ | |
81 | int bgp_event (struct thread *); | |
82 | ||
83 | /* BGP thread functions. */ | |
84 | static int bgp_start_timer (struct thread *); | |
85 | static int bgp_connect_timer (struct thread *); | |
86 | static int bgp_holdtime_timer (struct thread *); | |
87 | static int bgp_keepalive_timer (struct thread *); | |
88 | ||
89 | /* BGP FSM functions. */ | |
90 | static int bgp_start (struct peer *); | |
91 | ||
1ff9a340 DS |
92 | static void |
93 | peer_xfer_stats (struct peer *peer_dst, struct peer *peer_src) | |
94 | { | |
95 | /* Copy stats over. These are only the pre-established state stats */ | |
96 | peer_dst->open_in += peer_src->open_in; | |
97 | peer_dst->open_out += peer_src->open_out; | |
98 | peer_dst->keepalive_in += peer_src->keepalive_in; | |
99 | peer_dst->keepalive_out += peer_src->keepalive_out; | |
100 | peer_dst->notify_in += peer_src->notify_in; | |
101 | peer_dst->notify_out += peer_src->notify_out; | |
102 | peer_dst->dynamic_cap_in += peer_src->dynamic_cap_in; | |
103 | peer_dst->dynamic_cap_out += peer_src->dynamic_cap_out; | |
104 | } | |
105 | ||
106 | static struct peer * | |
107 | peer_xfer_conn(struct peer *from_peer) | |
108 | { | |
109 | struct peer *peer; | |
110 | afi_t afi; | |
111 | safi_t safi; | |
112 | int fd; | |
113 | int status, pstatus; | |
6403814c | 114 | unsigned char last_evt, last_maj_evt; |
1ff9a340 DS |
115 | |
116 | assert(from_peer != NULL); | |
117 | ||
118 | peer = from_peer->doppelganger; | |
119 | ||
120 | if (!peer || !CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE)) | |
121 | return from_peer; | |
122 | ||
3f9c7369 | 123 | if (bgp_debug_neighbor_events(peer)) |
5b6dc0dd DS |
124 | zlog_debug ("%s: peer transfer %p fd %d -> %p fd %d)", from_peer->host, |
125 | from_peer, from_peer->fd, peer, peer->fd); | |
3f9c7369 | 126 | |
1ff9a340 DS |
127 | BGP_WRITE_OFF(peer->t_write); |
128 | BGP_READ_OFF(peer->t_read); | |
129 | BGP_WRITE_OFF(from_peer->t_write); | |
130 | BGP_READ_OFF(from_peer->t_read); | |
131 | ||
3f9c7369 DS |
132 | BGP_TIMER_OFF(peer->t_routeadv); |
133 | BGP_TIMER_OFF(from_peer->t_routeadv); | |
134 | ||
1ff9a340 DS |
135 | fd = peer->fd; |
136 | peer->fd = from_peer->fd; | |
137 | from_peer->fd = fd; | |
138 | stream_reset(peer->ibuf); | |
139 | stream_fifo_clean(peer->obuf); | |
140 | stream_fifo_clean(from_peer->obuf); | |
141 | ||
0299c004 | 142 | peer->as = from_peer->as; |
1ff9a340 DS |
143 | peer->v_holdtime = from_peer->v_holdtime; |
144 | peer->v_keepalive = from_peer->v_keepalive; | |
145 | peer->v_asorig = from_peer->v_asorig; | |
146 | peer->routeadv = from_peer->routeadv; | |
147 | peer->v_routeadv = from_peer->v_routeadv; | |
148 | peer->v_gr_restart = from_peer->v_gr_restart; | |
149 | peer->cap = from_peer->cap; | |
150 | status = peer->status; | |
151 | pstatus = peer->ostatus; | |
6403814c DS |
152 | last_evt = peer->last_event; |
153 | last_maj_evt = peer->last_major_event; | |
1ff9a340 DS |
154 | peer->status = from_peer->status; |
155 | peer->ostatus = from_peer->ostatus; | |
6403814c DS |
156 | peer->last_event = from_peer->last_event; |
157 | peer->last_major_event = from_peer->last_major_event; | |
1ff9a340 DS |
158 | from_peer->status = status; |
159 | from_peer->ostatus = pstatus; | |
6403814c DS |
160 | from_peer->last_event = last_evt; |
161 | from_peer->last_major_event = last_maj_evt; | |
1ff9a340 DS |
162 | peer->remote_id = from_peer->remote_id; |
163 | ||
164 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
165 | for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++) | |
166 | { | |
167 | peer->af_flags[afi][safi] = from_peer->af_flags[afi][safi]; | |
168 | peer->af_sflags[afi][safi] = from_peer->af_sflags[afi][safi]; | |
169 | peer->af_cap[afi][safi] = from_peer->af_cap[afi][safi]; | |
170 | peer->afc_nego[afi][safi] = from_peer->afc_nego[afi][safi]; | |
171 | peer->afc_adv[afi][safi] = from_peer->afc_adv[afi][safi]; | |
172 | peer->afc_recv[afi][safi] = from_peer->afc_recv[afi][safi]; | |
173 | } | |
174 | ||
175 | if (bgp_getsockname(peer) < 0) | |
176 | { | |
177 | zlog_err ("%%bgp_getsockname() failed for %s peer %s fd %d (from_peer fd %d)", | |
178 | (CHECK_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER) ? "accept" : ""), | |
179 | peer->host, peer->fd, from_peer->fd); | |
180 | bgp_stop(peer); | |
181 | bgp_stop(from_peer); | |
182 | return NULL; | |
183 | } | |
184 | if (from_peer->status > Active) | |
185 | { | |
186 | if (bgp_getsockname(from_peer) < 0) | |
187 | { | |
188 | zlog_err ("%%bgp_getsockname() failed for %s from_peer %s fd %d (peer fd %d)", | |
189 | (CHECK_FLAG (from_peer->sflags, PEER_STATUS_ACCEPT_PEER) ? "accept" : ""), | |
190 | from_peer->host, from_peer->fd, peer->fd); | |
191 | bgp_stop(from_peer); | |
192 | from_peer = NULL; | |
193 | } | |
194 | } | |
195 | ||
196 | BGP_READ_ON(peer->t_read, bgp_read, peer->fd); | |
197 | BGP_WRITE_ON(peer->t_write, bgp_write, peer->fd); | |
198 | ||
199 | if (from_peer) | |
200 | peer_xfer_stats(peer, from_peer); | |
201 | ||
202 | return(peer); | |
203 | } | |
204 | ||
ca058a30 PJ |
205 | /* Check if suppress start/restart of sessions to peer. */ |
206 | #define BGP_PEER_START_SUPPRESSED(P) \ | |
207 | (CHECK_FLAG ((P)->flags, PEER_FLAG_SHUTDOWN) \ | |
208 | || CHECK_FLAG ((P)->sflags, PEER_STATUS_PREFIX_OVERFLOW)) | |
209 | ||
718e3744 | 210 | /* Hook function called after bgp event is occered. And vty's |
211 | neighbor command invoke this function after making neighbor | |
212 | structure. */ | |
213 | void | |
214 | bgp_timer_set (struct peer *peer) | |
215 | { | |
718e3744 | 216 | switch (peer->status) |
217 | { | |
218 | case Idle: | |
219 | /* First entry point of peer's finite state machine. In Idle | |
220 | status start timer is on unless peer is shutdown or peer is | |
221 | inactive. All other timer must be turned off */ | |
ca058a30 | 222 | if (BGP_PEER_START_SUPPRESSED (peer) || ! peer_active (peer)) |
718e3744 | 223 | { |
224 | BGP_TIMER_OFF (peer->t_start); | |
225 | } | |
226 | else | |
227 | { | |
718e3744 | 228 | BGP_TIMER_ON (peer->t_start, bgp_start_timer, |
5ca5f1c8 | 229 | peer->v_start); |
718e3744 | 230 | } |
231 | BGP_TIMER_OFF (peer->t_connect); | |
232 | BGP_TIMER_OFF (peer->t_holdtime); | |
233 | BGP_TIMER_OFF (peer->t_keepalive); | |
234 | BGP_TIMER_OFF (peer->t_asorig); | |
235 | BGP_TIMER_OFF (peer->t_routeadv); | |
236 | break; | |
237 | ||
238 | case Connect: | |
5ca5f1c8 | 239 | /* After start timer is expired, the peer moves to Connect |
718e3744 | 240 | status. Make sure start timer is off and connect timer is |
241 | on. */ | |
242 | BGP_TIMER_OFF (peer->t_start); | |
243 | BGP_TIMER_ON (peer->t_connect, bgp_connect_timer, peer->v_connect); | |
244 | BGP_TIMER_OFF (peer->t_holdtime); | |
245 | BGP_TIMER_OFF (peer->t_keepalive); | |
246 | BGP_TIMER_OFF (peer->t_asorig); | |
247 | BGP_TIMER_OFF (peer->t_routeadv); | |
248 | break; | |
249 | ||
250 | case Active: | |
251 | /* Active is waiting connection from remote peer. And if | |
252 | connect timer is expired, change status to Connect. */ | |
253 | BGP_TIMER_OFF (peer->t_start); | |
254 | /* If peer is passive mode, do not set connect timer. */ | |
93406d87 | 255 | if (CHECK_FLAG (peer->flags, PEER_FLAG_PASSIVE) |
256 | || CHECK_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT)) | |
718e3744 | 257 | { |
258 | BGP_TIMER_OFF (peer->t_connect); | |
259 | } | |
260 | else | |
261 | { | |
262 | BGP_TIMER_ON (peer->t_connect, bgp_connect_timer, peer->v_connect); | |
263 | } | |
264 | BGP_TIMER_OFF (peer->t_holdtime); | |
265 | BGP_TIMER_OFF (peer->t_keepalive); | |
266 | BGP_TIMER_OFF (peer->t_asorig); | |
267 | BGP_TIMER_OFF (peer->t_routeadv); | |
268 | break; | |
269 | ||
270 | case OpenSent: | |
271 | /* OpenSent status. */ | |
272 | BGP_TIMER_OFF (peer->t_start); | |
273 | BGP_TIMER_OFF (peer->t_connect); | |
274 | if (peer->v_holdtime != 0) | |
275 | { | |
276 | BGP_TIMER_ON (peer->t_holdtime, bgp_holdtime_timer, | |
277 | peer->v_holdtime); | |
278 | } | |
279 | else | |
280 | { | |
281 | BGP_TIMER_OFF (peer->t_holdtime); | |
282 | } | |
283 | BGP_TIMER_OFF (peer->t_keepalive); | |
284 | BGP_TIMER_OFF (peer->t_asorig); | |
285 | BGP_TIMER_OFF (peer->t_routeadv); | |
286 | break; | |
287 | ||
288 | case OpenConfirm: | |
289 | /* OpenConfirm status. */ | |
290 | BGP_TIMER_OFF (peer->t_start); | |
291 | BGP_TIMER_OFF (peer->t_connect); | |
292 | ||
293 | /* If the negotiated Hold Time value is zero, then the Hold Time | |
294 | timer and KeepAlive timers are not started. */ | |
295 | if (peer->v_holdtime == 0) | |
296 | { | |
297 | BGP_TIMER_OFF (peer->t_holdtime); | |
298 | BGP_TIMER_OFF (peer->t_keepalive); | |
299 | } | |
300 | else | |
301 | { | |
302 | BGP_TIMER_ON (peer->t_holdtime, bgp_holdtime_timer, | |
303 | peer->v_holdtime); | |
304 | BGP_TIMER_ON (peer->t_keepalive, bgp_keepalive_timer, | |
305 | peer->v_keepalive); | |
306 | } | |
307 | BGP_TIMER_OFF (peer->t_asorig); | |
308 | BGP_TIMER_OFF (peer->t_routeadv); | |
309 | break; | |
310 | ||
311 | case Established: | |
312 | /* In Established status start and connect timer is turned | |
313 | off. */ | |
314 | BGP_TIMER_OFF (peer->t_start); | |
315 | BGP_TIMER_OFF (peer->t_connect); | |
316 | ||
317 | /* Same as OpenConfirm, if holdtime is zero then both holdtime | |
318 | and keepalive must be turned off. */ | |
319 | if (peer->v_holdtime == 0) | |
320 | { | |
321 | BGP_TIMER_OFF (peer->t_holdtime); | |
322 | BGP_TIMER_OFF (peer->t_keepalive); | |
323 | } | |
324 | else | |
325 | { | |
326 | BGP_TIMER_ON (peer->t_holdtime, bgp_holdtime_timer, | |
327 | peer->v_holdtime); | |
328 | BGP_TIMER_ON (peer->t_keepalive, bgp_keepalive_timer, | |
329 | peer->v_keepalive); | |
330 | } | |
331 | BGP_TIMER_OFF (peer->t_asorig); | |
332 | break; | |
ca058a30 PJ |
333 | case Deleted: |
334 | BGP_TIMER_OFF (peer->t_gr_restart); | |
335 | BGP_TIMER_OFF (peer->t_gr_stale); | |
336 | BGP_TIMER_OFF (peer->t_pmax_restart); | |
337 | case Clearing: | |
338 | BGP_TIMER_OFF (peer->t_start); | |
339 | BGP_TIMER_OFF (peer->t_connect); | |
340 | BGP_TIMER_OFF (peer->t_holdtime); | |
341 | BGP_TIMER_OFF (peer->t_keepalive); | |
342 | BGP_TIMER_OFF (peer->t_asorig); | |
343 | BGP_TIMER_OFF (peer->t_routeadv); | |
1ff9a340 | 344 | break; |
718e3744 | 345 | } |
346 | } | |
347 | ||
348 | /* BGP start timer. This function set BGP_Start event to thread value | |
349 | and process event. */ | |
350 | static int | |
351 | bgp_start_timer (struct thread *thread) | |
352 | { | |
353 | struct peer *peer; | |
354 | ||
355 | peer = THREAD_ARG (thread); | |
356 | peer->t_start = NULL; | |
357 | ||
16286195 DS |
358 | if (bgp_debug_neighbor_events(peer)) |
359 | zlog_debug("%s [FSM] Timer (start timer expire).", peer->host); | |
718e3744 | 360 | |
361 | THREAD_VAL (thread) = BGP_Start; | |
200df115 | 362 | bgp_event (thread); /* bgp_event unlocks peer */ |
718e3744 | 363 | |
364 | return 0; | |
365 | } | |
366 | ||
367 | /* BGP connect retry timer. */ | |
368 | static int | |
369 | bgp_connect_timer (struct thread *thread) | |
370 | { | |
371 | struct peer *peer; | |
1ff9a340 | 372 | int ret; |
718e3744 | 373 | |
374 | peer = THREAD_ARG (thread); | |
375 | peer->t_connect = NULL; | |
376 | ||
16286195 DS |
377 | if (bgp_debug_neighbor_events(peer)) |
378 | zlog_debug("%s [FSM] Timer (connect timer expire)", peer->host); | |
718e3744 | 379 | |
1ff9a340 DS |
380 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
381 | { | |
382 | bgp_stop(peer); | |
383 | ret = -1; | |
384 | } | |
385 | else | |
386 | { | |
387 | THREAD_VAL (thread) = ConnectRetry_timer_expired; | |
388 | bgp_event (thread); /* bgp_event unlocks peer */ | |
389 | ret = 0; | |
390 | } | |
718e3744 | 391 | |
1ff9a340 | 392 | return ret; |
718e3744 | 393 | } |
394 | ||
395 | /* BGP holdtime timer. */ | |
396 | static int | |
397 | bgp_holdtime_timer (struct thread *thread) | |
398 | { | |
399 | struct peer *peer; | |
400 | ||
401 | peer = THREAD_ARG (thread); | |
402 | peer->t_holdtime = NULL; | |
403 | ||
16286195 DS |
404 | if (bgp_debug_neighbor_events(peer)) |
405 | zlog_debug ("%s [FSM] Timer (holdtime timer expire)", peer->host); | |
718e3744 | 406 | |
407 | THREAD_VAL (thread) = Hold_Timer_expired; | |
200df115 | 408 | bgp_event (thread); /* bgp_event unlocks peer */ |
718e3744 | 409 | |
410 | return 0; | |
411 | } | |
412 | ||
413 | /* BGP keepalive fire ! */ | |
414 | static int | |
415 | bgp_keepalive_timer (struct thread *thread) | |
416 | { | |
417 | struct peer *peer; | |
418 | ||
419 | peer = THREAD_ARG (thread); | |
420 | peer->t_keepalive = NULL; | |
421 | ||
16286195 DS |
422 | if (bgp_debug_neighbor_events(peer)) |
423 | zlog_debug ("%s [FSM] Timer (keepalive timer expire)", peer->host); | |
718e3744 | 424 | |
425 | THREAD_VAL (thread) = KeepAlive_timer_expired; | |
200df115 | 426 | bgp_event (thread); /* bgp_event unlocks peer */ |
718e3744 | 427 | |
428 | return 0; | |
429 | } | |
430 | ||
3f9c7369 | 431 | int |
718e3744 | 432 | bgp_routeadv_timer (struct thread *thread) |
433 | { | |
434 | struct peer *peer; | |
435 | ||
436 | peer = THREAD_ARG (thread); | |
437 | peer->t_routeadv = NULL; | |
438 | ||
16286195 DS |
439 | if (bgp_debug_neighbor_events(peer)) |
440 | zlog_debug ("%s [FSM] Timer (routeadv timer expire)", peer->host); | |
718e3744 | 441 | |
65957886 | 442 | peer->synctime = bgp_clock (); |
718e3744 | 443 | |
eb821189 | 444 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); |
718e3744 | 445 | |
3f9c7369 DS |
446 | /* MRAI timer will be started again when FIFO is built, no need to |
447 | * do it here. | |
cb1faec9 | 448 | */ |
718e3744 | 449 | return 0; |
450 | } | |
451 | ||
e0701b79 | 452 | /* BGP Peer Down Cause */ |
fd79ac91 | 453 | const char *peer_down_str[] = |
e0701b79 | 454 | { |
455 | "", | |
456 | "Router ID changed", | |
457 | "Remote AS changed", | |
458 | "Local AS change", | |
459 | "Cluster ID changed", | |
460 | "Confederation identifier changed", | |
461 | "Confederation peer changed", | |
462 | "RR client config change", | |
463 | "RS client config change", | |
464 | "Update source change", | |
465 | "Address family activated", | |
466 | "Admin. shutdown", | |
467 | "User reset", | |
468 | "BGP Notification received", | |
469 | "BGP Notification send", | |
470 | "Peer closed the session", | |
471 | "Neighbor deleted", | |
472 | "Peer-group add member", | |
473 | "Peer-group delete member", | |
474 | "Capability changed", | |
475 | "Passive config change", | |
93406d87 | 476 | "Multihop config change", |
cceb0bfc | 477 | "NSF peer closed the session", |
7bbc6864 DS |
478 | "Intf peering v6only config change", |
479 | "BFD down received" | |
e0701b79 | 480 | }; |
481 | ||
94f2b392 | 482 | static int |
93406d87 | 483 | bgp_graceful_restart_timer_expire (struct thread *thread) |
484 | { | |
485 | struct peer *peer; | |
486 | afi_t afi; | |
487 | safi_t safi; | |
488 | ||
489 | peer = THREAD_ARG (thread); | |
490 | peer->t_gr_restart = NULL; | |
491 | ||
492 | /* NSF delete stale route */ | |
493 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
0a28130d | 494 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_3 ; safi++) |
93406d87 | 495 | if (peer->nsf[afi][safi]) |
496 | bgp_clear_stale_route (peer, afi, safi); | |
497 | ||
498 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT); | |
499 | BGP_TIMER_OFF (peer->t_gr_stale); | |
500 | ||
16286195 | 501 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 502 | { |
503 | zlog_debug ("%s graceful restart timer expired", peer->host); | |
504 | zlog_debug ("%s graceful restart stalepath timer stopped", peer->host); | |
505 | } | |
506 | ||
507 | bgp_timer_set (peer); | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
94f2b392 | 512 | static int |
93406d87 | 513 | bgp_graceful_stale_timer_expire (struct thread *thread) |
514 | { | |
515 | struct peer *peer; | |
516 | afi_t afi; | |
517 | safi_t safi; | |
518 | ||
519 | peer = THREAD_ARG (thread); | |
520 | peer->t_gr_stale = NULL; | |
521 | ||
16286195 | 522 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 523 | zlog_debug ("%s graceful restart stalepath timer expired", peer->host); |
524 | ||
525 | /* NSF delete stale route */ | |
526 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
0a28130d | 527 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_3 ; safi++) |
93406d87 | 528 | if (peer->nsf[afi][safi]) |
529 | bgp_clear_stale_route (peer, afi, safi); | |
530 | ||
531 | return 0; | |
532 | } | |
533 | ||
f188f2c4 DS |
534 | static int |
535 | bgp_update_delay_applicable (struct bgp *bgp) | |
536 | { | |
537 | /* update_delay_over flag should be reset (set to 0) for any new | |
538 | applicability of the update-delay during BGP process lifetime. | |
539 | And it should be set after an occurence of the update-delay is over)*/ | |
540 | if (!bgp->update_delay_over) | |
541 | return 1; | |
542 | ||
543 | return 0; | |
544 | } | |
545 | ||
546 | int | |
547 | bgp_update_delay_active (struct bgp *bgp) | |
548 | { | |
549 | if (bgp->t_update_delay) | |
550 | return 1; | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
555 | int | |
556 | bgp_update_delay_configured (struct bgp *bgp) | |
557 | { | |
558 | if (bgp->v_update_delay) | |
559 | return 1; | |
560 | ||
561 | return 0; | |
562 | } | |
563 | ||
564 | /* Do the post-processing needed when bgp comes out of the read-only mode | |
565 | on ending the update delay. */ | |
566 | void | |
567 | bgp_update_delay_end (struct bgp *bgp) | |
568 | { | |
f188f2c4 DS |
569 | THREAD_TIMER_OFF (bgp->t_update_delay); |
570 | THREAD_TIMER_OFF (bgp->t_establish_wait); | |
571 | ||
572 | /* Reset update-delay related state */ | |
573 | bgp->update_delay_over = 1; | |
574 | bgp->established = 0; | |
575 | bgp->restarted_peers = 0; | |
576 | bgp->implicit_eors = 0; | |
577 | bgp->explicit_eors = 0; | |
578 | ||
579 | quagga_timestamp(3, bgp->update_delay_end_time, | |
580 | sizeof(bgp->update_delay_end_time)); | |
581 | ||
cb1faec9 DS |
582 | /* |
583 | * Add an end-of-initial-update marker to the main process queues so that | |
4a16ae86 DS |
584 | * the route advertisement timer for the peers can be started. Also set |
585 | * the zebra and peer update hold flags. These flags are used to achieve | |
586 | * three stages in the update-delay post processing: | |
587 | * 1. Finish best-path selection for all the prefixes held on the queues. | |
588 | * (routes in BGP are updated, and peers sync queues are populated too) | |
589 | * 2. As the eoiu mark is reached in the bgp process routine, ship all the | |
590 | * routes to zebra. With that zebra should see updates from BGP close | |
591 | * to each other. | |
592 | * 3. Unblock the peer update writes. With that peer update packing with | |
593 | * the prefixes should be at its maximum. | |
cb1faec9 DS |
594 | */ |
595 | bgp_add_eoiu_mark(bgp, BGP_TABLE_MAIN); | |
596 | bgp_add_eoiu_mark(bgp, BGP_TABLE_RSCLIENT); | |
4a16ae86 DS |
597 | bgp->main_zebra_update_hold = 1; |
598 | bgp->main_peers_update_hold = 1; | |
599 | bgp->rsclient_peers_update_hold = 1; | |
f188f2c4 DS |
600 | |
601 | /* Resume the queue processing. This should trigger the event that would take | |
602 | care of processing any work that was queued during the read-only mode. */ | |
603 | work_queue_unplug(bm->process_main_queue); | |
604 | work_queue_unplug(bm->process_rsclient_queue); | |
605 | } | |
606 | ||
cb1faec9 DS |
607 | /** |
608 | * see bgp_fsm.h | |
609 | */ | |
610 | void | |
611 | bgp_start_routeadv (struct bgp *bgp) | |
612 | { | |
613 | struct listnode *node, *nnode; | |
614 | struct peer *peer; | |
615 | ||
4a16ae86 DS |
616 | zlog_info("bgp_start_routeadv(), update hold status - main: %d, rsclient: %d", |
617 | bgp->main_peers_update_hold, bgp->rsclient_peers_update_hold); | |
618 | ||
619 | if (bgp->main_peers_update_hold || bgp->rsclient_peers_update_hold) | |
620 | return; | |
621 | ||
622 | quagga_timestamp(3, bgp->update_delay_peers_resume_time, | |
623 | sizeof(bgp->update_delay_peers_resume_time)); | |
624 | ||
cb1faec9 DS |
625 | for (ALL_LIST_ELEMENTS (bgp->peer, node, nnode, peer)) |
626 | { | |
627 | if (peer->status != Established) | |
628 | continue; | |
629 | BGP_TIMER_OFF(peer->t_routeadv); | |
630 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
631 | } | |
632 | } | |
633 | ||
634 | /** | |
635 | * see bgp_fsm.h | |
636 | */ | |
637 | void | |
638 | bgp_adjust_routeadv (struct peer *peer) | |
639 | { | |
640 | time_t nowtime = bgp_clock(); | |
641 | double diff; | |
642 | unsigned long remain; | |
643 | ||
d889623f DS |
644 | /* Bypass checks for special case of MRAI being 0 */ |
645 | if (peer->v_routeadv == 0) | |
646 | { | |
647 | /* Stop existing timer, just in case it is running for a different | |
648 | * duration and schedule write thread immediately. | |
649 | */ | |
650 | if (peer->t_routeadv) | |
651 | BGP_TIMER_OFF(peer->t_routeadv); | |
652 | ||
653 | peer->synctime = bgp_clock (); | |
654 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); | |
655 | return; | |
656 | } | |
657 | ||
d889623f | 658 | |
cb1faec9 DS |
659 | /* |
660 | * CASE I: | |
661 | * If the last update was written more than MRAI back, expire the timer | |
662 | * instantly so that we can send the update out sooner. | |
663 | * | |
664 | * <------- MRAI ---------> | |
665 | * |-----------------|-----------------------| | |
666 | * <------------- m ------------> | |
667 | * ^ ^ ^ | |
668 | * | | | | |
669 | * | | current time | |
670 | * | timer start | |
671 | * last write | |
672 | * | |
673 | * m > MRAI | |
674 | */ | |
675 | diff = difftime(nowtime, peer->last_write); | |
676 | if (diff > (double) peer->v_routeadv) | |
677 | { | |
678 | BGP_TIMER_OFF(peer->t_routeadv); | |
679 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
cb1faec9 DS |
680 | return; |
681 | } | |
682 | ||
683 | /* | |
684 | * CASE II: | |
685 | * - Find when to expire the MRAI timer. | |
686 | * If MRAI timer is not active, assume we can start it now. | |
687 | * | |
688 | * <------- MRAI ---------> | |
689 | * |------------|-----------------------| | |
690 | * <-------- m ----------><----- r -----> | |
691 | * ^ ^ ^ | |
692 | * | | | | |
693 | * | | current time | |
694 | * | timer start | |
695 | * last write | |
696 | * | |
697 | * (MRAI - m) < r | |
698 | */ | |
699 | if (peer->t_routeadv) | |
700 | remain = thread_timer_remain_second(peer->t_routeadv); | |
701 | else | |
702 | remain = peer->v_routeadv; | |
703 | diff = peer->v_routeadv - diff; | |
704 | if (diff <= (double) remain) | |
705 | { | |
706 | BGP_TIMER_OFF(peer->t_routeadv); | |
707 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, diff); | |
cb1faec9 DS |
708 | } |
709 | } | |
710 | ||
abc920f8 DS |
711 | static int |
712 | bgp_maxmed_onstartup_applicable (struct bgp *bgp) | |
713 | { | |
714 | if (!bgp->maxmed_onstartup_over) | |
715 | return 1; | |
716 | ||
717 | return 0; | |
718 | } | |
719 | ||
720 | int | |
721 | bgp_maxmed_onstartup_configured (struct bgp *bgp) | |
722 | { | |
723 | if (bgp->v_maxmed_onstartup != BGP_MAXMED_ONSTARTUP_UNCONFIGURED) | |
724 | return 1; | |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
729 | int | |
730 | bgp_maxmed_onstartup_active (struct bgp *bgp) | |
731 | { | |
732 | if (bgp->t_maxmed_onstartup) | |
733 | return 1; | |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
738 | void | |
739 | bgp_maxmed_update (struct bgp *bgp) | |
740 | { | |
abc920f8 DS |
741 | u_char maxmed_active; |
742 | u_int32_t maxmed_value; | |
743 | ||
744 | if (bgp->v_maxmed_admin) | |
745 | { | |
746 | maxmed_active = 1; | |
747 | maxmed_value = bgp->maxmed_admin_value; | |
748 | } | |
749 | else if (bgp->t_maxmed_onstartup) | |
750 | { | |
751 | maxmed_active = 1; | |
752 | maxmed_value = bgp->maxmed_onstartup_value; | |
753 | } | |
754 | else | |
755 | { | |
756 | maxmed_active = 0; | |
757 | maxmed_value = BGP_MAXMED_VALUE_DEFAULT; | |
758 | } | |
759 | ||
760 | if (bgp->maxmed_active != maxmed_active || | |
761 | bgp->maxmed_value != maxmed_value) | |
762 | { | |
763 | bgp->maxmed_active = maxmed_active; | |
764 | bgp->maxmed_value = maxmed_value; | |
765 | ||
3f9c7369 | 766 | update_group_announce(bgp); |
abc920f8 DS |
767 | } |
768 | } | |
769 | ||
770 | /* The maxmed onstartup timer expiry callback. */ | |
771 | static int | |
772 | bgp_maxmed_onstartup_timer (struct thread *thread) | |
773 | { | |
774 | struct bgp *bgp; | |
775 | ||
776 | zlog_info ("Max med on startup ended - timer expired."); | |
777 | ||
778 | bgp = THREAD_ARG (thread); | |
779 | THREAD_TIMER_OFF (bgp->t_maxmed_onstartup); | |
780 | bgp->maxmed_onstartup_over = 1; | |
781 | ||
782 | bgp_maxmed_update(bgp); | |
783 | ||
784 | return 0; | |
785 | } | |
786 | ||
787 | static void | |
788 | bgp_maxmed_onstartup_begin (struct bgp *bgp) | |
789 | { | |
790 | /* Applicable only once in the process lifetime on the startup */ | |
791 | if (bgp->maxmed_onstartup_over) | |
792 | return; | |
793 | ||
794 | zlog_info ("Begin maxmed onstartup mode - timer %d seconds", | |
795 | bgp->v_maxmed_onstartup); | |
796 | ||
797 | THREAD_TIMER_ON (master, bgp->t_maxmed_onstartup, | |
798 | bgp_maxmed_onstartup_timer, | |
799 | bgp, bgp->v_maxmed_onstartup); | |
800 | ||
801 | if (!bgp->v_maxmed_admin) | |
802 | { | |
803 | bgp->maxmed_active = 1; | |
804 | bgp->maxmed_value = bgp->maxmed_onstartup_value; | |
805 | } | |
806 | ||
807 | /* Route announce to all peers should happen after this in bgp_establish() */ | |
808 | } | |
809 | ||
810 | static void | |
811 | bgp_maxmed_onstartup_process_status_change(struct peer *peer) | |
812 | { | |
813 | if (peer->status == Established && !peer->bgp->established) | |
814 | { | |
815 | bgp_maxmed_onstartup_begin(peer->bgp); | |
816 | } | |
817 | } | |
818 | ||
f188f2c4 DS |
819 | /* The update delay timer expiry callback. */ |
820 | static int | |
821 | bgp_update_delay_timer (struct thread *thread) | |
822 | { | |
823 | struct bgp *bgp; | |
824 | ||
825 | zlog_info ("Update delay ended - timer expired."); | |
826 | ||
827 | bgp = THREAD_ARG (thread); | |
828 | THREAD_TIMER_OFF (bgp->t_update_delay); | |
829 | bgp_update_delay_end(bgp); | |
830 | ||
831 | return 0; | |
832 | } | |
833 | ||
834 | /* The establish wait timer expiry callback. */ | |
835 | static int | |
836 | bgp_establish_wait_timer (struct thread *thread) | |
837 | { | |
838 | struct bgp *bgp; | |
839 | ||
840 | zlog_info ("Establish wait - timer expired."); | |
841 | ||
842 | bgp = THREAD_ARG (thread); | |
843 | THREAD_TIMER_OFF (bgp->t_establish_wait); | |
844 | bgp_check_update_delay(bgp); | |
845 | ||
846 | return 0; | |
847 | } | |
848 | ||
849 | /* Steps to begin the update delay: | |
850 | - initialize queues if needed | |
851 | - stop the queue processing | |
852 | - start the timer */ | |
853 | static void | |
854 | bgp_update_delay_begin (struct bgp *bgp) | |
855 | { | |
856 | struct listnode *node, *nnode; | |
857 | struct peer *peer; | |
858 | ||
859 | if ((bm->process_main_queue == NULL) || | |
860 | (bm->process_rsclient_queue == NULL)) | |
861 | bgp_process_queue_init(); | |
862 | ||
863 | /* Stop the processing of queued work. Enqueue shall continue */ | |
864 | work_queue_plug(bm->process_main_queue); | |
865 | work_queue_plug(bm->process_rsclient_queue); | |
866 | ||
867 | for (ALL_LIST_ELEMENTS (bgp->peer, node, nnode, peer)) | |
868 | peer->update_delay_over = 0; | |
869 | ||
870 | /* Start the update-delay timer */ | |
871 | THREAD_TIMER_ON (master, bgp->t_update_delay, bgp_update_delay_timer, | |
872 | bgp, bgp->v_update_delay); | |
873 | ||
874 | if (bgp->v_establish_wait != bgp->v_update_delay) | |
875 | THREAD_TIMER_ON (master, bgp->t_establish_wait, bgp_establish_wait_timer, | |
876 | bgp, bgp->v_establish_wait); | |
877 | ||
878 | quagga_timestamp(3, bgp->update_delay_begin_time, | |
879 | sizeof(bgp->update_delay_begin_time)); | |
880 | } | |
881 | ||
882 | static void | |
883 | bgp_update_delay_process_status_change(struct peer *peer) | |
884 | { | |
885 | if (peer->status == Established) | |
886 | { | |
887 | if (!peer->bgp->established++) | |
888 | { | |
889 | bgp_update_delay_begin(peer->bgp); | |
890 | zlog_info ("Begin read-only mode - update-delay timer %d seconds", | |
891 | peer->bgp->v_update_delay); | |
892 | } | |
893 | if (CHECK_FLAG (peer->cap, PEER_CAP_RESTART_BIT_RCV)) | |
894 | bgp_update_restarted_peers(peer); | |
895 | } | |
896 | if (peer->ostatus == Established && bgp_update_delay_active(peer->bgp)) | |
897 | { | |
898 | /* Adjust the update-delay state to account for this flap. | |
899 | NOTE: Intentionally skipping adjusting implicit_eors or explicit_eors | |
900 | counters. Extra sanity check in bgp_check_update_delay() should | |
901 | be enough to take care of any additive discrepancy in bgp eor | |
902 | counters */ | |
903 | peer->bgp->established--; | |
904 | peer->update_delay_over = 0; | |
905 | } | |
906 | } | |
907 | ||
200df115 | 908 | /* Called after event occured, this function change status and reset |
909 | read/write and timer thread. */ | |
910 | void | |
911 | bgp_fsm_change_status (struct peer *peer, int status) | |
912 | { | |
1ff9a340 | 913 | |
200df115 | 914 | bgp_dump_state (peer, peer->status, status); |
915 | ||
f2c31acb PJ |
916 | /* Transition into Clearing or Deleted must /always/ clear all routes.. |
917 | * (and must do so before actually changing into Deleted.. | |
918 | */ | |
919 | if (status >= Clearing) | |
dc83d712 DS |
920 | { |
921 | bgp_clear_route_all (peer); | |
922 | ||
923 | /* If no route was queued for the clear-node processing, generate the | |
924 | * completion event here. This is needed because if there are no routes | |
925 | * to trigger the background clear-node thread, the event won't get | |
926 | * generated and the peer would be stuck in Clearing. Note that this | |
927 | * event is for the peer and helps the peer transition out of Clearing | |
928 | * state; it should not be generated per (AFI,SAFI). The event is | |
929 | * directly posted here without calling clear_node_complete() as we | |
930 | * shouldn't do an extra unlock. This event will get processed after | |
931 | * the state change that happens below, so peer will be in Clearing | |
932 | * (or Deleted). | |
933 | */ | |
934 | if (!peer->clear_node_queue->thread) | |
935 | BGP_EVENT_ADD (peer, Clearing_Completed); | |
936 | } | |
f2c31acb | 937 | |
200df115 | 938 | /* Preserve old status and change into new status. */ |
939 | peer->ostatus = peer->status; | |
940 | peer->status = status; | |
f188f2c4 | 941 | |
6403814c DS |
942 | /* Save event that caused status change. */ |
943 | peer->last_major_event = peer->cur_event; | |
944 | ||
1ff9a340 DS |
945 | if (status == Established) |
946 | UNSET_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER); | |
947 | ||
abc920f8 DS |
948 | /* If max-med processing is applicable, do the necessary. */ |
949 | if (status == Established) | |
950 | { | |
951 | if (bgp_maxmed_onstartup_configured(peer->bgp) && | |
952 | bgp_maxmed_onstartup_applicable(peer->bgp)) | |
953 | bgp_maxmed_onstartup_process_status_change(peer); | |
954 | else | |
955 | peer->bgp->maxmed_onstartup_over = 1; | |
956 | } | |
957 | ||
f188f2c4 DS |
958 | /* If update-delay processing is applicable, do the necessary. */ |
959 | if (bgp_update_delay_configured(peer->bgp) && | |
960 | bgp_update_delay_applicable(peer->bgp)) | |
961 | bgp_update_delay_process_status_change(peer); | |
962 | ||
16286195 | 963 | if (bgp_debug_neighbor_events(peer)) |
200df115 | 964 | zlog_debug ("%s went from %s to %s", |
965 | peer->host, | |
966 | LOOKUP (bgp_status_msg, peer->ostatus), | |
967 | LOOKUP (bgp_status_msg, peer->status)); | |
968 | } | |
969 | ||
3117b5c4 | 970 | /* Flush the event queue and ensure the peer is shut down */ |
9e4ca89c | 971 | static int |
3117b5c4 SH |
972 | bgp_clearing_completed (struct peer *peer) |
973 | { | |
974 | int rc = bgp_stop(peer); | |
1ff9a340 DS |
975 | |
976 | if (rc >= 0) | |
977 | BGP_EVENT_FLUSH (peer); | |
3117b5c4 SH |
978 | |
979 | return rc; | |
980 | } | |
981 | ||
718e3744 | 982 | /* Administrative BGP peer stop event. */ |
3117b5c4 | 983 | /* May be called multiple times for the same peer */ |
718e3744 | 984 | int |
985 | bgp_stop (struct peer *peer) | |
986 | { | |
718e3744 | 987 | afi_t afi; |
988 | safi_t safi; | |
989 | char orf_name[BUFSIZ]; | |
1ff9a340 | 990 | int ret = 0; |
718e3744 | 991 | |
f14e6fdb DS |
992 | if (peer_dynamic_neighbor(peer) && |
993 | !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) | |
994 | { | |
995 | if (bgp_debug_neighbor_events(peer)) | |
996 | zlog_debug ("%s (dynamic neighbor) deleted", peer->host); | |
997 | peer_delete (peer); | |
998 | return -1; | |
999 | } | |
1000 | ||
3117b5c4 SH |
1001 | /* Can't do this in Clearing; events are used for state transitions */ |
1002 | if (peer->status != Clearing) | |
2158ad23 PJ |
1003 | { |
1004 | /* Delete all existing events of the peer */ | |
1005 | BGP_EVENT_FLUSH (peer); | |
1006 | } | |
dcdf399f | 1007 | |
718e3744 | 1008 | /* Increment Dropped count. */ |
1009 | if (peer->status == Established) | |
1010 | { | |
718e3744 | 1011 | peer->dropped++; |
848973c7 | 1012 | |
1013 | /* bgp log-neighbor-changes of neighbor Down */ | |
1014 | if (bgp_flag_check (peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) | |
e0701b79 | 1015 | zlog_info ("%%ADJCHANGE: neighbor %s Down %s", peer->host, |
1016 | peer_down_str [(int) peer->last_reset]); | |
848973c7 | 1017 | |
93406d87 | 1018 | /* graceful restart */ |
1019 | if (peer->t_gr_stale) | |
1020 | { | |
1021 | BGP_TIMER_OFF (peer->t_gr_stale); | |
16286195 | 1022 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 1023 | zlog_debug ("%s graceful restart stalepath timer stopped", peer->host); |
1024 | } | |
1025 | if (CHECK_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT)) | |
1026 | { | |
16286195 | 1027 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 1028 | { |
1029 | zlog_debug ("%s graceful restart timer started for %d sec", | |
1030 | peer->host, peer->v_gr_restart); | |
1031 | zlog_debug ("%s graceful restart stalepath timer started for %d sec", | |
1032 | peer->host, peer->bgp->stalepath_time); | |
1033 | } | |
1034 | BGP_TIMER_ON (peer->t_gr_restart, bgp_graceful_restart_timer_expire, | |
1035 | peer->v_gr_restart); | |
1036 | BGP_TIMER_ON (peer->t_gr_stale, bgp_graceful_stale_timer_expire, | |
1037 | peer->bgp->stalepath_time); | |
1038 | } | |
1039 | else | |
1040 | { | |
1041 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_MODE); | |
1042 | ||
1043 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
0a28130d | 1044 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_3 ; safi++) |
93406d87 | 1045 | peer->nsf[afi][safi] = 0; |
1046 | } | |
1047 | ||
848973c7 | 1048 | /* set last reset time */ |
65957886 | 1049 | peer->resettime = peer->uptime = bgp_clock (); |
848973c7 | 1050 | |
3f9c7369 DS |
1051 | if (BGP_DEBUG (update_groups, UPDATE_GROUPS)) |
1052 | zlog_debug ("%s remove from all update group", peer->host); | |
1053 | update_group_remove_peer_afs(peer); | |
1054 | ||
718e3744 | 1055 | #ifdef HAVE_SNMP |
1056 | bgpTrapBackwardTransition (peer); | |
1057 | #endif /* HAVE_SNMP */ | |
718e3744 | 1058 | |
f418446b | 1059 | /* Reset peer synctime */ |
1060 | peer->synctime = 0; | |
c43ed2e4 DS |
1061 | |
1062 | bgp_bfd_deregister_peer(peer); | |
538621f2 | 1063 | } |
718e3744 | 1064 | |
1065 | /* Stop read and write threads when exists. */ | |
1066 | BGP_READ_OFF (peer->t_read); | |
1067 | BGP_WRITE_OFF (peer->t_write); | |
1068 | ||
1069 | /* Stop all timers. */ | |
1070 | BGP_TIMER_OFF (peer->t_start); | |
1071 | BGP_TIMER_OFF (peer->t_connect); | |
1072 | BGP_TIMER_OFF (peer->t_holdtime); | |
1073 | BGP_TIMER_OFF (peer->t_keepalive); | |
1074 | BGP_TIMER_OFF (peer->t_asorig); | |
1075 | BGP_TIMER_OFF (peer->t_routeadv); | |
1076 | ||
718e3744 | 1077 | /* Stream reset. */ |
1078 | peer->packet_size = 0; | |
1079 | ||
1080 | /* Clear input and output buffer. */ | |
1081 | if (peer->ibuf) | |
1082 | stream_reset (peer->ibuf); | |
1083 | if (peer->work) | |
1084 | stream_reset (peer->work); | |
200df115 | 1085 | if (peer->obuf) |
1086 | stream_fifo_clean (peer->obuf); | |
718e3744 | 1087 | |
eb821189 | 1088 | /* Close of file descriptor. */ |
1089 | if (peer->fd >= 0) | |
1090 | { | |
1091 | close (peer->fd); | |
1092 | peer->fd = -1; | |
1093 | } | |
718e3744 | 1094 | |
718e3744 | 1095 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) |
1096 | for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++) | |
1097 | { | |
538621f2 | 1098 | /* Reset all negotiated variables */ |
1099 | peer->afc_nego[afi][safi] = 0; | |
1100 | peer->afc_adv[afi][safi] = 0; | |
1101 | peer->afc_recv[afi][safi] = 0; | |
1102 | ||
718e3744 | 1103 | /* peer address family capability flags*/ |
1104 | peer->af_cap[afi][safi] = 0; | |
538621f2 | 1105 | |
718e3744 | 1106 | /* peer address family status flags*/ |
1107 | peer->af_sflags[afi][safi] = 0; | |
538621f2 | 1108 | |
718e3744 | 1109 | /* Received ORF prefix-filter */ |
1110 | peer->orf_plist[afi][safi] = NULL; | |
538621f2 | 1111 | |
1ff9a340 DS |
1112 | if ((peer->status == OpenConfirm) || (peer->status == Established)) { |
1113 | /* ORF received prefix-filter pnt */ | |
1114 | sprintf (orf_name, "%s.%d.%d", peer->host, afi, safi); | |
1115 | prefix_bgp_orf_remove_all (orf_name); | |
1116 | } | |
718e3744 | 1117 | } |
1118 | ||
1119 | /* Reset keepalive and holdtime */ | |
1120 | if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER)) | |
1121 | { | |
1122 | peer->v_keepalive = peer->keepalive; | |
1123 | peer->v_holdtime = peer->holdtime; | |
1124 | } | |
1125 | else | |
1126 | { | |
1127 | peer->v_keepalive = peer->bgp->default_keepalive; | |
1128 | peer->v_holdtime = peer->bgp->default_holdtime; | |
1129 | } | |
1130 | ||
1131 | peer->update_time = 0; | |
1132 | ||
1133 | /* Until we are sure that there is no problem about prefix count | |
1134 | this should be commented out.*/ | |
1135 | #if 0 | |
1136 | /* Reset prefix count */ | |
1137 | peer->pcount[AFI_IP][SAFI_UNICAST] = 0; | |
1138 | peer->pcount[AFI_IP][SAFI_MULTICAST] = 0; | |
1139 | peer->pcount[AFI_IP][SAFI_MPLS_VPN] = 0; | |
1140 | peer->pcount[AFI_IP6][SAFI_UNICAST] = 0; | |
1141 | peer->pcount[AFI_IP6][SAFI_MULTICAST] = 0; | |
1142 | #endif /* 0 */ | |
1143 | ||
1ff9a340 DS |
1144 | if (!CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE) && |
1145 | !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) | |
1146 | { | |
1147 | peer_delete(peer); | |
1148 | ret = -1; | |
1149 | } | |
a80beece DS |
1150 | else |
1151 | { | |
1152 | bgp_peer_conf_if_to_su_update(peer); | |
1153 | } | |
1ff9a340 DS |
1154 | |
1155 | return ret; | |
718e3744 | 1156 | } |
1157 | ||
1158 | /* BGP peer is stoped by the error. */ | |
94f2b392 | 1159 | static int |
718e3744 | 1160 | bgp_stop_with_error (struct peer *peer) |
1161 | { | |
1162 | /* Double start timer. */ | |
1163 | peer->v_start *= 2; | |
1164 | ||
1165 | /* Overflow check. */ | |
1166 | if (peer->v_start >= (60 * 2)) | |
1167 | peer->v_start = (60 * 2); | |
1168 | ||
f14e6fdb DS |
1169 | if (peer_dynamic_neighbor(peer)) |
1170 | { | |
1171 | if (bgp_debug_neighbor_events(peer)) | |
1172 | zlog_debug ("%s (dynamic neighbor) deleted", peer->host); | |
1173 | peer_delete (peer); | |
1174 | return -1; | |
1175 | } | |
1176 | ||
1ff9a340 | 1177 | return(bgp_stop (peer)); |
718e3744 | 1178 | } |
1179 | ||
397b5bde LR |
1180 | |
1181 | /* something went wrong, send notify and tear down */ | |
1182 | static int | |
1183 | bgp_stop_with_notify (struct peer *peer, u_char code, u_char sub_code) | |
1184 | { | |
1185 | /* Send notify to remote peer */ | |
1186 | bgp_notify_send (peer, code, sub_code); | |
1187 | ||
f14e6fdb DS |
1188 | if (peer_dynamic_neighbor(peer)) |
1189 | { | |
1190 | if (bgp_debug_neighbor_events(peer)) | |
1191 | zlog_debug ("%s (dynamic neighbor) deleted", peer->host); | |
1192 | peer_delete (peer); | |
1193 | return -1; | |
1194 | } | |
1195 | ||
397b5bde LR |
1196 | /* Clear start timer value to default. */ |
1197 | peer->v_start = BGP_INIT_START_TIMER; | |
1198 | ||
1ff9a340 | 1199 | return(bgp_stop(peer)); |
397b5bde LR |
1200 | } |
1201 | ||
1202 | ||
718e3744 | 1203 | /* TCP connection open. Next we send open message to remote peer. And |
1204 | add read thread for reading open message. */ | |
94f2b392 | 1205 | static int |
718e3744 | 1206 | bgp_connect_success (struct peer *peer) |
1207 | { | |
eb821189 | 1208 | if (peer->fd < 0) |
718e3744 | 1209 | { |
1210 | zlog_err ("bgp_connect_success peer's fd is negative value %d", | |
eb821189 | 1211 | peer->fd); |
1ff9a340 | 1212 | bgp_stop(peer); |
718e3744 | 1213 | return -1; |
1214 | } | |
718e3744 | 1215 | |
1ff9a340 DS |
1216 | if (bgp_getsockname (peer) < 0) |
1217 | { | |
5b6dc0dd DS |
1218 | zlog_err ("%s: bgp_getsockname(): failed for peer %s, fd %d", __FUNCTION__, |
1219 | peer->host, peer->fd); | |
1ff9a340 DS |
1220 | bgp_notify_send(peer, BGP_NOTIFY_FSM_ERR, 0); /* internal error */ |
1221 | return -1; | |
1222 | } | |
1223 | ||
1224 | BGP_READ_ON (peer->t_read, bgp_read, peer->fd); | |
f418446b | 1225 | |
16286195 | 1226 | if (bgp_debug_neighbor_events(peer)) |
f418446b | 1227 | { |
682ca04c JBD |
1228 | char buf1[SU_ADDRSTRLEN]; |
1229 | ||
f418446b | 1230 | if (! CHECK_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
1231 | zlog_debug ("%s open active, local address %s", peer->host, | |
1232 | sockunion2str (peer->su_local, buf1, SU_ADDRSTRLEN)); | |
1233 | else | |
1234 | zlog_debug ("%s passive open", peer->host); | |
1235 | } | |
718e3744 | 1236 | |
1ff9a340 | 1237 | bgp_open_send (peer); |
718e3744 | 1238 | |
1239 | return 0; | |
1240 | } | |
1241 | ||
1242 | /* TCP connect fail */ | |
94f2b392 | 1243 | static int |
718e3744 | 1244 | bgp_connect_fail (struct peer *peer) |
1245 | { | |
f14e6fdb DS |
1246 | if (peer_dynamic_neighbor(peer)) |
1247 | { | |
1248 | if (bgp_debug_neighbor_events(peer)) | |
1249 | zlog_debug ("%s (dynamic neighbor) deleted", peer->host); | |
1250 | peer_delete (peer); | |
1251 | return -1; | |
1252 | } | |
1253 | ||
1ff9a340 | 1254 | return (bgp_stop (peer)); |
718e3744 | 1255 | } |
1256 | ||
1257 | /* This function is the first starting point of all BGP connection. It | |
1258 | try to connect to remote peer with non-blocking IO. */ | |
1259 | int | |
1260 | bgp_start (struct peer *peer) | |
1261 | { | |
1262 | int status; | |
fc9a856f | 1263 | int connected = 0; |
718e3744 | 1264 | |
a80beece DS |
1265 | bgp_peer_conf_if_to_su_update(peer); |
1266 | ||
ca058a30 PJ |
1267 | if (BGP_PEER_START_SUPPRESSED (peer)) |
1268 | { | |
16286195 DS |
1269 | if (bgp_debug_neighbor_events(peer)) |
1270 | zlog_err ("%s [FSM] Trying to start suppressed peer" | |
ca058a30 PJ |
1271 | " - this is never supposed to happen!", peer->host); |
1272 | return -1; | |
1273 | } | |
1274 | ||
33d5ab9e PJ |
1275 | /* Scrub some information that might be left over from a previous, |
1276 | * session | |
1277 | */ | |
1278 | /* Connection information. */ | |
1279 | if (peer->su_local) | |
1280 | { | |
1281 | sockunion_free (peer->su_local); | |
1282 | peer->su_local = NULL; | |
1283 | } | |
1284 | ||
1285 | if (peer->su_remote) | |
1286 | { | |
1287 | sockunion_free (peer->su_remote); | |
1288 | peer->su_remote = NULL; | |
1289 | } | |
1290 | ||
1291 | /* Clear remote router-id. */ | |
1292 | peer->remote_id.s_addr = 0; | |
1293 | ||
1294 | /* Clear peer capability flag. */ | |
1295 | peer->cap = 0; | |
1296 | ||
718e3744 | 1297 | /* If the peer is passive mode, force to move to Active mode. */ |
1298 | if (CHECK_FLAG (peer->flags, PEER_FLAG_PASSIVE)) | |
1299 | { | |
1300 | BGP_EVENT_ADD (peer, TCP_connection_open_failed); | |
1301 | return 0; | |
1302 | } | |
1303 | ||
fc9a856f | 1304 | /* Register to be notified on peer up */ |
c5a5c4ff DS |
1305 | if (peer->sort == BGP_PEER_EBGP && peer->ttl == 1 && |
1306 | ! CHECK_FLAG (peer->flags, PEER_FLAG_DISABLE_CONNECTED_CHECK) | |
1307 | && ! bgp_flag_check(peer->bgp, BGP_FLAG_DISABLE_NH_CONNECTED_CHK)) | |
fc9a856f | 1308 | connected = 1; |
c5a5c4ff DS |
1309 | else |
1310 | connected = 0; | |
fc9a856f | 1311 | |
65740e1b DS |
1312 | if (!bgp_find_or_add_nexthop(peer->bgp, family2afi(peer->su.sa.sa_family), |
1313 | NULL, peer, connected)) | |
1314 | { | |
1315 | if (bgp_debug_neighbor_events(peer)) | |
c5a5c4ff DS |
1316 | zlog_debug ("%s [FSM] Waiting for NHT", peer->host); |
1317 | ||
1318 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
65740e1b DS |
1319 | return 0; |
1320 | } | |
1321 | ||
718e3744 | 1322 | status = bgp_connect (peer); |
1323 | ||
1324 | switch (status) | |
1325 | { | |
1326 | case connect_error: | |
16286195 DS |
1327 | if (bgp_debug_neighbor_events(peer)) |
1328 | zlog_debug ("%s [FSM] Connect error", peer->host); | |
718e3744 | 1329 | BGP_EVENT_ADD (peer, TCP_connection_open_failed); |
1330 | break; | |
1331 | case connect_success: | |
16286195 | 1332 | if (bgp_debug_neighbor_events(peer)) |
5b6dc0dd DS |
1333 | zlog_debug ("%s [FSM] Connect immediately success, fd %d", |
1334 | peer->host, peer->fd); | |
718e3744 | 1335 | BGP_EVENT_ADD (peer, TCP_connection_open); |
1336 | break; | |
1337 | case connect_in_progress: | |
1338 | /* To check nonblocking connect, we wait until socket is | |
1339 | readable or writable. */ | |
16286195 | 1340 | if (bgp_debug_neighbor_events(peer)) |
5b6dc0dd DS |
1341 | zlog_debug ("%s [FSM] Non blocking connect waiting result, fd %d", |
1342 | peer->host, peer->fd); | |
eb821189 | 1343 | if (peer->fd < 0) |
718e3744 | 1344 | { |
1345 | zlog_err ("bgp_start peer's fd is negative value %d", | |
eb821189 | 1346 | peer->fd); |
718e3744 | 1347 | return -1; |
1348 | } | |
eb821189 | 1349 | BGP_READ_ON (peer->t_read, bgp_read, peer->fd); |
1350 | BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd); | |
718e3744 | 1351 | break; |
1352 | } | |
1353 | return 0; | |
1354 | } | |
1355 | ||
1356 | /* Connect retry timer is expired when the peer status is Connect. */ | |
94f2b392 | 1357 | static int |
718e3744 | 1358 | bgp_reconnect (struct peer *peer) |
1359 | { | |
fb98973a DS |
1360 | if (bgp_stop (peer) < 0) |
1361 | return -1; | |
1ff9a340 | 1362 | |
fb98973a DS |
1363 | bgp_start (peer); |
1364 | return 0; | |
718e3744 | 1365 | } |
1366 | ||
94f2b392 | 1367 | static int |
718e3744 | 1368 | bgp_fsm_open (struct peer *peer) |
1369 | { | |
1370 | /* Send keepalive and make keepalive timer */ | |
1371 | bgp_keepalive_send (peer); | |
1372 | ||
1373 | /* Reset holdtimer value. */ | |
1374 | BGP_TIMER_OFF (peer->t_holdtime); | |
1375 | ||
1376 | return 0; | |
1377 | } | |
1378 | ||
718e3744 | 1379 | /* Keepalive send to peer. */ |
94f2b392 | 1380 | static int |
718e3744 | 1381 | bgp_fsm_keepalive_expire (struct peer *peer) |
1382 | { | |
1383 | bgp_keepalive_send (peer); | |
1384 | return 0; | |
1385 | } | |
1386 | ||
397b5bde LR |
1387 | /* FSM error, unexpected event. This is error of BGP connection. So cut the |
1388 | peer and change to Idle status. */ | |
1389 | static int | |
1390 | bgp_fsm_event_error (struct peer *peer) | |
1391 | { | |
16286195 | 1392 | zlog_err ("%s [FSM] unexpected packet received in state %s", |
397b5bde LR |
1393 | peer->host, LOOKUP (bgp_status_msg, peer->status)); |
1394 | ||
1395 | return bgp_stop_with_notify (peer, BGP_NOTIFY_FSM_ERR, 0); | |
1396 | } | |
1397 | ||
718e3744 | 1398 | /* Hold timer expire. This is error of BGP connection. So cut the |
1399 | peer and change to Idle status. */ | |
94f2b392 | 1400 | static int |
718e3744 | 1401 | bgp_fsm_holdtime_expire (struct peer *peer) |
1402 | { | |
16286195 DS |
1403 | if (bgp_debug_neighbor_events(peer)) |
1404 | zlog_debug ("%s [FSM] Hold timer expire", peer->host); | |
718e3744 | 1405 | |
397b5bde | 1406 | return bgp_stop_with_notify (peer, BGP_NOTIFY_HOLD_ERR, 0); |
718e3744 | 1407 | } |
1408 | ||
1409 | /* Status goes to Established. Send keepalive packet then make first | |
1410 | update information. */ | |
94f2b392 | 1411 | static int |
718e3744 | 1412 | bgp_establish (struct peer *peer) |
1413 | { | |
1414 | struct bgp_notify *notify; | |
1415 | afi_t afi; | |
1416 | safi_t safi; | |
93406d87 | 1417 | int nsf_af_count = 0; |
1ff9a340 DS |
1418 | int ret = 0; |
1419 | struct peer *other; | |
1420 | ||
1421 | other = peer->doppelganger; | |
1422 | peer = peer_xfer_conn(peer); | |
1423 | if (!peer) | |
1424 | { | |
1425 | zlog_err ("%%Neighbor failed in xfer_conn"); | |
1426 | return -1; | |
1427 | } | |
1428 | ||
1429 | if (other == peer) | |
1430 | ret = 1; /* bgp_establish specific code when xfer_conn happens. */ | |
718e3744 | 1431 | |
1432 | /* Reset capability open status flag. */ | |
1433 | if (! CHECK_FLAG (peer->sflags, PEER_STATUS_CAPABILITY_OPEN)) | |
1434 | SET_FLAG (peer->sflags, PEER_STATUS_CAPABILITY_OPEN); | |
1435 | ||
1436 | /* Clear last notification data. */ | |
1437 | notify = &peer->notify; | |
1438 | if (notify->data) | |
1439 | XFREE (MTYPE_TMP, notify->data); | |
1440 | memset (notify, 0, sizeof (struct bgp_notify)); | |
1441 | ||
1442 | /* Clear start timer value to default. */ | |
1443 | peer->v_start = BGP_INIT_START_TIMER; | |
1444 | ||
1445 | /* Increment established count. */ | |
1446 | peer->established++; | |
1447 | bgp_fsm_change_status (peer, Established); | |
848973c7 | 1448 | |
1449 | /* bgp log-neighbor-changes of neighbor Up */ | |
1450 | if (bgp_flag_check (peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) | |
1451 | zlog_info ("%%ADJCHANGE: neighbor %s Up", peer->host); | |
1452 | ||
3f9c7369 DS |
1453 | /* assign update-group/subgroup */ |
1454 | update_group_adjust_peer_afs(peer); | |
1455 | ||
93406d87 | 1456 | /* graceful restart */ |
1457 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT); | |
1458 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
0a28130d | 1459 | for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_3 ; safi++) |
93406d87 | 1460 | { |
1461 | if (peer->afc_nego[afi][safi] | |
1462 | && CHECK_FLAG (peer->cap, PEER_CAP_RESTART_ADV) | |
1463 | && CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_RESTART_AF_RCV)) | |
1464 | { | |
1465 | if (peer->nsf[afi][safi] | |
1466 | && ! CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_RESTART_AF_PRESERVE_RCV)) | |
1467 | bgp_clear_stale_route (peer, afi, safi); | |
1468 | ||
1469 | peer->nsf[afi][safi] = 1; | |
1470 | nsf_af_count++; | |
1471 | } | |
1472 | else | |
1473 | { | |
1474 | if (peer->nsf[afi][safi]) | |
1475 | bgp_clear_stale_route (peer, afi, safi); | |
1476 | peer->nsf[afi][safi] = 0; | |
1477 | } | |
1478 | } | |
1479 | ||
1480 | if (nsf_af_count) | |
1481 | SET_FLAG (peer->sflags, PEER_STATUS_NSF_MODE); | |
1482 | else | |
1483 | { | |
1484 | UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_MODE); | |
1485 | if (peer->t_gr_stale) | |
1486 | { | |
1487 | BGP_TIMER_OFF (peer->t_gr_stale); | |
16286195 | 1488 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 1489 | zlog_debug ("%s graceful restart stalepath timer stopped", peer->host); |
1490 | } | |
1491 | } | |
1492 | ||
1493 | if (peer->t_gr_restart) | |
1494 | { | |
1495 | BGP_TIMER_OFF (peer->t_gr_restart); | |
16286195 | 1496 | if (bgp_debug_neighbor_events(peer)) |
93406d87 | 1497 | zlog_debug ("%s graceful restart timer stopped", peer->host); |
1498 | } | |
1499 | ||
718e3744 | 1500 | #ifdef HAVE_SNMP |
1501 | bgpTrapEstablished (peer); | |
1502 | #endif /* HAVE_SNMP */ | |
1503 | ||
1504 | /* Reset uptime, send keepalive, send current table. */ | |
65957886 | 1505 | peer->uptime = bgp_clock (); |
718e3744 | 1506 | |
1507 | /* Send route-refresh when ORF is enabled */ | |
1508 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
1509 | for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++) | |
1510 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_SM_ADV)) | |
1511 | { | |
1512 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_RM_RCV)) | |
1513 | bgp_route_refresh_send (peer, afi, safi, ORF_TYPE_PREFIX, | |
1514 | REFRESH_IMMEDIATE, 0); | |
1515 | else if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_RM_OLD_RCV)) | |
1516 | bgp_route_refresh_send (peer, afi, safi, ORF_TYPE_PREFIX_OLD, | |
1517 | REFRESH_IMMEDIATE, 0); | |
1518 | } | |
1519 | ||
718e3744 | 1520 | /* First update is deferred until ORF or ROUTE-REFRESH is received */ |
1521 | for (afi = AFI_IP ; afi < AFI_MAX ; afi++) | |
1522 | for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++) | |
1523 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_RM_ADV)) | |
1524 | if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_SM_RCV) | |
1525 | || CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ORF_PREFIX_SM_OLD_RCV)) | |
1526 | SET_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_ORF_WAIT_REFRESH); | |
1527 | ||
3f9c7369 | 1528 | bgp_announce_peer (peer); |
718e3744 | 1529 | |
cb1faec9 DS |
1530 | /* Start the route advertisement timer to send updates to the peer - if BGP |
1531 | * is not in read-only mode. If it is, the timer will be started at the end | |
1532 | * of read-only mode. | |
1533 | */ | |
1534 | if (!bgp_update_delay_active(peer->bgp)) | |
3f9c7369 DS |
1535 | { |
1536 | BGP_TIMER_OFF(peer->t_routeadv); | |
1537 | BGP_TIMER_ON (peer->t_routeadv, bgp_routeadv_timer, 0); | |
1538 | } | |
718e3744 | 1539 | |
1ff9a340 DS |
1540 | if (peer->doppelganger && (peer->doppelganger->status != Deleted)) |
1541 | { | |
16286195 | 1542 | if (bgp_debug_neighbor_events(peer)) |
1ff9a340 DS |
1543 | zlog_debug("[Event] Deleting stub connection for peer %s", peer->host); |
1544 | ||
1545 | if (peer->doppelganger->status > Active) | |
1546 | bgp_notify_send (peer->doppelganger, BGP_NOTIFY_CEASE, | |
1547 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
1548 | else | |
1549 | peer_delete(peer->doppelganger); | |
1550 | } | |
1551 | ||
c43ed2e4 | 1552 | bgp_bfd_register_peer(peer); |
1ff9a340 | 1553 | return ret; |
718e3744 | 1554 | } |
1555 | ||
1556 | /* Keepalive packet is received. */ | |
94f2b392 | 1557 | static int |
718e3744 | 1558 | bgp_fsm_keepalive (struct peer *peer) |
1559 | { | |
f188f2c4 DS |
1560 | bgp_update_implicit_eors(peer); |
1561 | ||
718e3744 | 1562 | /* peer count update */ |
1563 | peer->keepalive_in++; | |
1564 | ||
1565 | BGP_TIMER_OFF (peer->t_holdtime); | |
1566 | return 0; | |
1567 | } | |
1568 | ||
1569 | /* Update packet is received. */ | |
94f2b392 | 1570 | static int |
718e3744 | 1571 | bgp_fsm_update (struct peer *peer) |
1572 | { | |
1573 | BGP_TIMER_OFF (peer->t_holdtime); | |
1574 | return 0; | |
1575 | } | |
1576 | ||
1577 | /* This is empty event. */ | |
94f2b392 | 1578 | static int |
718e3744 | 1579 | bgp_ignore (struct peer *peer) |
1580 | { | |
5b6dc0dd | 1581 | zlog_err ("%s [FSM] Ignoring event %s in state %s, prior events %s, %s, fd %d", |
6403814c DS |
1582 | peer->host, bgp_event_str[peer->cur_event], |
1583 | LOOKUP (bgp_status_msg, peer->status), | |
1584 | bgp_event_str[peer->last_event], | |
5b6dc0dd | 1585 | bgp_event_str[peer->last_major_event], peer->fd); |
718e3744 | 1586 | return 0; |
1587 | } | |
6b0655a2 | 1588 | |
6403814c DS |
1589 | /* This is to handle unexpected events.. */ |
1590 | static int | |
1591 | bgp_fsm_exeption (struct peer *peer) | |
1592 | { | |
5b6dc0dd | 1593 | zlog_err ("%s [FSM] Unexpected event %s in state %s, prior events %s, %s, fd %d", |
6403814c DS |
1594 | peer->host, bgp_event_str[peer->cur_event], |
1595 | LOOKUP (bgp_status_msg, peer->status), | |
1596 | bgp_event_str[peer->last_event], | |
5b6dc0dd | 1597 | bgp_event_str[peer->last_major_event], peer->fd); |
6403814c DS |
1598 | return(bgp_stop (peer)); |
1599 | } | |
1600 | ||
fc9a856f DS |
1601 | void |
1602 | bgp_fsm_nht_update(struct peer *peer, int valid) | |
1603 | { | |
fc9a856f DS |
1604 | if (!peer) |
1605 | return; | |
1606 | ||
1607 | switch (peer->status) | |
1608 | { | |
1609 | case Idle: | |
1610 | if (valid) | |
1611 | BGP_EVENT_ADD(peer, BGP_Start); | |
1612 | break; | |
1613 | case Connect: | |
c5a5c4ff | 1614 | if (!valid) |
fc9a856f DS |
1615 | { |
1616 | BGP_TIMER_OFF(peer->t_connect); | |
c5a5c4ff | 1617 | BGP_EVENT_ADD(peer, TCP_fatal_error); |
fc9a856f DS |
1618 | } |
1619 | break; | |
1620 | case Active: | |
1621 | if (valid) | |
1622 | { | |
1623 | BGP_TIMER_OFF(peer->t_connect); | |
1624 | BGP_EVENT_ADD(peer, ConnectRetry_timer_expired); | |
1625 | } | |
c5a5c4ff | 1626 | break; |
fc9a856f DS |
1627 | case OpenSent: |
1628 | case OpenConfirm: | |
1629 | case Established: | |
c5a5c4ff DS |
1630 | if (!valid && (peer->gtsm_hops == 1)) |
1631 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
fc9a856f DS |
1632 | case Clearing: |
1633 | case Deleted: | |
1634 | default: | |
1635 | break; | |
1636 | } | |
1637 | } | |
1638 | ||
1639 | ||
718e3744 | 1640 | /* Finite State Machine structure */ |
fda1d3e0 | 1641 | static const struct { |
66e5cd87 | 1642 | int (*func) (struct peer *); |
718e3744 | 1643 | int next_state; |
1644 | } FSM [BGP_STATUS_MAX - 1][BGP_EVENTS_MAX - 1] = | |
1645 | { | |
1646 | { | |
1647 | /* Idle state: In Idle state, all events other than BGP_Start is | |
1648 | ignored. With BGP_Start event, finite state machine calls | |
1649 | bgp_start(). */ | |
1650 | {bgp_start, Connect}, /* BGP_Start */ | |
1651 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1652 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1653 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1654 | {bgp_ignore, Idle}, /* TCP_connection_open_failed */ | |
1655 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1656 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ | |
1657 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
1658 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
1659 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
1660 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
1661 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
1662 | {bgp_ignore, Idle}, /* Receive_NOTIFICATION_message */ | |
ca058a30 | 1663 | {bgp_ignore, Idle}, /* Clearing_Completed */ |
718e3744 | 1664 | }, |
1665 | { | |
1666 | /* Connect */ | |
1667 | {bgp_ignore, Connect}, /* BGP_Start */ | |
1668 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1669 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1670 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1671 | {bgp_connect_fail, Active}, /* TCP_connection_open_failed */ | |
1672 | {bgp_connect_fail, Idle}, /* TCP_fatal_error */ | |
1673 | {bgp_reconnect, Connect}, /* ConnectRetry_timer_expired */ | |
6403814c DS |
1674 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ |
1675 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1676 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1677 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
1678 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
718e3744 | 1679 | {bgp_stop, Idle}, /* Receive_NOTIFICATION_message */ |
6403814c | 1680 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ |
718e3744 | 1681 | }, |
1682 | { | |
1683 | /* Active, */ | |
1684 | {bgp_ignore, Active}, /* BGP_Start */ | |
1685 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1686 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1687 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1688 | {bgp_ignore, Active}, /* TCP_connection_open_failed */ | |
6403814c | 1689 | {bgp_fsm_exeption, Idle}, /* TCP_fatal_error */ |
718e3744 | 1690 | {bgp_start, Connect}, /* ConnectRetry_timer_expired */ |
6403814c DS |
1691 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ |
1692 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1693 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1694 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
1695 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1696 | {bgp_fsm_exeption, Idle}, /* Receive_NOTIFICATION_message */ | |
1697 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
718e3744 | 1698 | }, |
1699 | { | |
1700 | /* OpenSent, */ | |
1701 | {bgp_ignore, OpenSent}, /* BGP_Start */ | |
1702 | {bgp_stop, Idle}, /* BGP_Stop */ | |
536792cd | 1703 | {bgp_stop, Active}, /* TCP_connection_open */ |
718e3744 | 1704 | {bgp_stop, Active}, /* TCP_connection_closed */ |
536792cd PJ |
1705 | {bgp_stop, Active}, /* TCP_connection_open_failed */ |
1706 | {bgp_stop, Active}, /* TCP_fatal_error */ | |
6403814c | 1707 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ |
718e3744 | 1708 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ |
6403814c | 1709 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ |
718e3744 | 1710 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ |
397b5bde LR |
1711 | {bgp_fsm_event_error, Idle}, /* Receive_KEEPALIVE_message */ |
1712 | {bgp_fsm_event_error, Idle}, /* Receive_UPDATE_message */ | |
718e3744 | 1713 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ |
6403814c | 1714 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ |
718e3744 | 1715 | }, |
1716 | { | |
1717 | /* OpenConfirm, */ | |
1718 | {bgp_ignore, OpenConfirm}, /* BGP_Start */ | |
1719 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1720 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1721 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1722 | {bgp_stop, Idle}, /* TCP_connection_open_failed */ | |
1723 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
6403814c | 1724 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ |
718e3744 | 1725 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ |
1726 | {bgp_ignore, OpenConfirm}, /* KeepAlive_timer_expired */ | |
6403814c | 1727 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ |
718e3744 | 1728 | {bgp_establish, Established}, /* Receive_KEEPALIVE_message */ |
6403814c | 1729 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ |
718e3744 | 1730 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ |
6403814c | 1731 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ |
718e3744 | 1732 | }, |
1733 | { | |
1734 | /* Established, */ | |
ca058a30 PJ |
1735 | {bgp_ignore, Established}, /* BGP_Start */ |
1736 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
1737 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1738 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
3117b5c4 | 1739 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ |
ca058a30 | 1740 | {bgp_stop, Clearing}, /* TCP_fatal_error */ |
3117b5c4 | 1741 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ |
ca058a30 | 1742 | {bgp_fsm_holdtime_expire, Clearing}, /* Hold_Timer_expired */ |
718e3744 | 1743 | {bgp_fsm_keepalive_expire, Established}, /* KeepAlive_timer_expired */ |
ca058a30 PJ |
1744 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ |
1745 | {bgp_fsm_keepalive, Established}, /* Receive_KEEPALIVE_message */ | |
1746 | {bgp_fsm_update, Established}, /* Receive_UPDATE_message */ | |
1747 | {bgp_stop_with_error, Clearing}, /* Receive_NOTIFICATION_message */ | |
6403814c | 1748 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ |
ca058a30 PJ |
1749 | }, |
1750 | { | |
1751 | /* Clearing, */ | |
1752 | {bgp_ignore, Clearing}, /* BGP_Start */ | |
3117b5c4 SH |
1753 | {bgp_stop, Clearing}, /* BGP_Stop */ |
1754 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1755 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
1756 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
1757 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
1758 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
1759 | {bgp_stop, Clearing}, /* Hold_Timer_expired */ | |
1760 | {bgp_stop, Clearing}, /* KeepAlive_timer_expired */ | |
1761 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
1762 | {bgp_stop, Clearing}, /* Receive_KEEPALIVE_message */ | |
1763 | {bgp_stop, Clearing}, /* Receive_UPDATE_message */ | |
1764 | {bgp_stop, Clearing}, /* Receive_NOTIFICATION_message */ | |
1765 | {bgp_clearing_completed, Idle}, /* Clearing_Completed */ | |
ca058a30 PJ |
1766 | }, |
1767 | { | |
1768 | /* Deleted, */ | |
1769 | {bgp_ignore, Deleted}, /* BGP_Start */ | |
1770 | {bgp_ignore, Deleted}, /* BGP_Stop */ | |
1771 | {bgp_ignore, Deleted}, /* TCP_connection_open */ | |
1772 | {bgp_ignore, Deleted}, /* TCP_connection_closed */ | |
1773 | {bgp_ignore, Deleted}, /* TCP_connection_open_failed */ | |
1774 | {bgp_ignore, Deleted}, /* TCP_fatal_error */ | |
1775 | {bgp_ignore, Deleted}, /* ConnectRetry_timer_expired */ | |
1776 | {bgp_ignore, Deleted}, /* Hold_Timer_expired */ | |
1777 | {bgp_ignore, Deleted}, /* KeepAlive_timer_expired */ | |
1778 | {bgp_ignore, Deleted}, /* Receive_OPEN_message */ | |
1779 | {bgp_ignore, Deleted}, /* Receive_KEEPALIVE_message */ | |
1780 | {bgp_ignore, Deleted}, /* Receive_UPDATE_message */ | |
1781 | {bgp_ignore, Deleted}, /* Receive_NOTIFICATION_message */ | |
1782 | {bgp_ignore, Deleted}, /* Clearing_Completed */ | |
718e3744 | 1783 | }, |
1784 | }; | |
1785 | ||
718e3744 | 1786 | /* Execute event process. */ |
1787 | int | |
1788 | bgp_event (struct thread *thread) | |
1789 | { | |
718e3744 | 1790 | int event; |
718e3744 | 1791 | struct peer *peer; |
1ff9a340 | 1792 | int ret; |
718e3744 | 1793 | |
1794 | peer = THREAD_ARG (thread); | |
1795 | event = THREAD_VAL (thread); | |
1796 | ||
1ff9a340 DS |
1797 | ret = bgp_event_update(peer, event); |
1798 | ||
1799 | return (ret); | |
1800 | } | |
1801 | ||
1802 | int | |
1803 | bgp_event_update (struct peer *peer, int event) | |
1804 | { | |
1805 | int next; | |
1806 | int ret = 0; | |
1807 | struct peer *other; | |
1808 | int passive_conn = 0; | |
f14e6fdb | 1809 | int dyn_nbr; |
1ff9a340 DS |
1810 | |
1811 | other = peer->doppelganger; | |
1812 | passive_conn = (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) ? 1 : 0; | |
f14e6fdb | 1813 | dyn_nbr = peer_dynamic_neighbor(peer); |
1ff9a340 | 1814 | |
718e3744 | 1815 | /* Logging this event. */ |
1816 | next = FSM [peer->status -1][event - 1].next_state; | |
1817 | ||
16286195 | 1818 | if (bgp_debug_neighbor_events(peer) && peer->status != next) |
5b6dc0dd | 1819 | zlog_debug ("%s [FSM] %s (%s->%s), fd %d", peer->host, |
718e3744 | 1820 | bgp_event_str[event], |
1821 | LOOKUP (bgp_status_msg, peer->status), | |
5b6dc0dd | 1822 | LOOKUP (bgp_status_msg, next), peer->fd); |
718e3744 | 1823 | |
6403814c DS |
1824 | peer->last_event = peer->cur_event; |
1825 | peer->cur_event = event; | |
1826 | ||
718e3744 | 1827 | /* Call function. */ |
ca058a30 PJ |
1828 | if (FSM [peer->status -1][event - 1].func) |
1829 | ret = (*(FSM [peer->status - 1][event - 1].func))(peer); | |
718e3744 | 1830 | |
1831 | /* When function do not want proceed next job return -1. */ | |
200df115 | 1832 | if (ret >= 0) |
1833 | { | |
1ff9a340 DS |
1834 | if (ret == 1 && next == Established) |
1835 | { | |
1836 | /* The case when doppelganger swap accurred in bgp_establish. | |
1837 | Update the peer pointer accordingly */ | |
1838 | peer = other; | |
1839 | } | |
1840 | ||
200df115 | 1841 | /* If status is changed. */ |
1842 | if (next != peer->status) | |
f2c31acb | 1843 | bgp_fsm_change_status (peer, next); |
95fdcd8a | 1844 | |
200df115 | 1845 | /* Make sure timer is set. */ |
1846 | bgp_timer_set (peer); | |
1ff9a340 DS |
1847 | |
1848 | } | |
f14e6fdb | 1849 | else if (!dyn_nbr && !passive_conn && peer->bgp) |
1ff9a340 DS |
1850 | { |
1851 | /* If we got a return value of -1, that means there was an error, restart | |
1852 | * the FSM. If the peer structure was deleted | |
1853 | */ | |
5b6dc0dd DS |
1854 | zlog_err ("%s [FSM] Failure handling event %s in state %s, " |
1855 | "prior events %s, %s, fd %d", | |
6403814c DS |
1856 | peer->host, bgp_event_str[peer->cur_event], |
1857 | LOOKUP (bgp_status_msg, peer->status), | |
1858 | bgp_event_str[peer->last_event], | |
5b6dc0dd | 1859 | bgp_event_str[peer->last_major_event], peer->fd); |
6403814c | 1860 | bgp_stop (peer); |
1ff9a340 DS |
1861 | bgp_fsm_change_status(peer, Idle); |
1862 | bgp_timer_set(peer); | |
200df115 | 1863 | } |
200df115 | 1864 | return ret; |
718e3744 | 1865 | } |