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d62a17ae | 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" | |
74ffbfe6 | 30 | #include "ringbuf.h" |
718e3744 | 31 | #include "memory.h" |
32 | #include "plist.h" | |
f188f2c4 | 33 | #include "workqueue.h" |
3f9c7369 | 34 | #include "queue.h" |
039f3a34 | 35 | #include "filter.h" |
4dcadbef | 36 | #include "command.h" |
02705213 | 37 | #include "lib_errors.h" |
718e3744 | 38 | |
856ca177 | 39 | #include "lib/json.h" |
718e3744 | 40 | #include "bgpd/bgpd.h" |
41 | #include "bgpd/bgp_attr.h" | |
42 | #include "bgpd/bgp_debug.h" | |
14454c9f | 43 | #include "bgpd/bgp_errors.h" |
718e3744 | 44 | #include "bgpd/bgp_fsm.h" |
45 | #include "bgpd/bgp_packet.h" | |
46 | #include "bgpd/bgp_network.h" | |
47 | #include "bgpd/bgp_route.h" | |
48 | #include "bgpd/bgp_dump.h" | |
49 | #include "bgpd/bgp_open.h" | |
f188f2c4 | 50 | #include "bgpd/bgp_advertise.h" |
3f9c7369 | 51 | #include "bgpd/bgp_updgrp.h" |
ffd0c037 | 52 | #include "bgpd/bgp_nht.h" |
c43ed2e4 | 53 | #include "bgpd/bgp_bfd.h" |
4a1ab8e4 | 54 | #include "bgpd/bgp_memory.h" |
03014d48 | 55 | #include "bgpd/bgp_keepalives.h" |
56257a44 | 56 | #include "bgpd/bgp_io.h" |
c42eab4b | 57 | #include "bgpd/bgp_zebra.h" |
6b0655a2 | 58 | |
d62a17ae | 59 | DEFINE_HOOK(peer_backward_transition, (struct peer * peer), (peer)) |
7d8d0eab | 60 | DEFINE_HOOK(peer_status_changed, (struct peer * peer), (peer)) |
3012671f | 61 | |
6403814c DS |
62 | /* Definition of display strings corresponding to FSM events. This should be |
63 | * kept consistent with the events defined in bgpd.h | |
64 | */ | |
2b64873d | 65 | static const char *const bgp_event_str[] = { |
d62a17ae | 66 | NULL, |
67 | "BGP_Start", | |
68 | "BGP_Stop", | |
69 | "TCP_connection_open", | |
70 | "TCP_connection_closed", | |
71 | "TCP_connection_open_failed", | |
72 | "TCP_fatal_error", | |
73 | "ConnectRetry_timer_expired", | |
74 | "Hold_Timer_expired", | |
75 | "KeepAlive_timer_expired", | |
76 | "Receive_OPEN_message", | |
77 | "Receive_KEEPALIVE_message", | |
78 | "Receive_UPDATE_message", | |
79 | "Receive_NOTIFICATION_message", | |
80 | "Clearing_Completed", | |
6403814c DS |
81 | }; |
82 | ||
718e3744 | 83 | /* BGP FSM (finite state machine) has three types of functions. Type |
84 | one is thread functions. Type two is event functions. Type three | |
85 | is FSM functions. Timer functions are set by bgp_timer_set | |
86 | function. */ | |
87 | ||
88 | /* BGP event function. */ | |
d62a17ae | 89 | int bgp_event(struct thread *); |
718e3744 | 90 | |
91 | /* BGP thread functions. */ | |
d62a17ae | 92 | static int bgp_start_timer(struct thread *); |
93 | static int bgp_connect_timer(struct thread *); | |
94 | static int bgp_holdtime_timer(struct thread *); | |
718e3744 | 95 | |
96 | /* BGP FSM functions. */ | |
d62a17ae | 97 | static int bgp_start(struct peer *); |
718e3744 | 98 | |
e2d3a909 | 99 | /* Register peer with NHT */ |
100 | static int bgp_peer_reg_with_nht(struct peer *peer) | |
101 | { | |
102 | int connected = 0; | |
103 | ||
c8d6f0d6 | 104 | if (peer->sort == BGP_PEER_EBGP && peer->ttl == BGP_DEFAULT_TTL |
e2d3a909 | 105 | && !CHECK_FLAG(peer->flags, PEER_FLAG_DISABLE_CONNECTED_CHECK) |
106 | && !bgp_flag_check(peer->bgp, BGP_FLAG_DISABLE_NH_CONNECTED_CHK)) | |
107 | connected = 1; | |
108 | ||
109 | return bgp_find_or_add_nexthop( | |
110 | peer->bgp, peer->bgp, family2afi(peer->su.sa.sa_family), | |
111 | NULL, peer, connected); | |
112 | } | |
113 | ||
d62a17ae | 114 | static void peer_xfer_stats(struct peer *peer_dst, struct peer *peer_src) |
1ff9a340 | 115 | { |
d62a17ae | 116 | /* Copy stats over. These are only the pre-established state stats */ |
117 | peer_dst->open_in += peer_src->open_in; | |
118 | peer_dst->open_out += peer_src->open_out; | |
119 | peer_dst->keepalive_in += peer_src->keepalive_in; | |
120 | peer_dst->keepalive_out += peer_src->keepalive_out; | |
121 | peer_dst->notify_in += peer_src->notify_in; | |
122 | peer_dst->notify_out += peer_src->notify_out; | |
123 | peer_dst->dynamic_cap_in += peer_src->dynamic_cap_in; | |
124 | peer_dst->dynamic_cap_out += peer_src->dynamic_cap_out; | |
1ff9a340 DS |
125 | } |
126 | ||
d62a17ae | 127 | static struct peer *peer_xfer_conn(struct peer *from_peer) |
1ff9a340 | 128 | { |
d62a17ae | 129 | struct peer *peer; |
130 | afi_t afi; | |
131 | safi_t safi; | |
132 | int fd; | |
133 | int status, pstatus; | |
134 | unsigned char last_evt, last_maj_evt; | |
135 | ||
136 | assert(from_peer != NULL); | |
137 | ||
138 | peer = from_peer->doppelganger; | |
139 | ||
140 | if (!peer || !CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE)) | |
141 | return from_peer; | |
142 | ||
9bf904cc DS |
143 | /* |
144 | * Let's check that we are not going to loose known configuration | |
145 | * state based upon doppelganger rules. | |
146 | */ | |
147 | FOREACH_AFI_SAFI (afi, safi) { | |
148 | if (from_peer->afc[afi][safi] != peer->afc[afi][safi]) { | |
149 | flog_err( | |
150 | EC_BGP_DOPPELGANGER_CONFIG, | |
151 | "from_peer->afc[%d][%d] is not the same as what we are overwriting", | |
152 | afi, safi); | |
153 | return NULL; | |
154 | } | |
155 | } | |
156 | ||
d62a17ae | 157 | if (bgp_debug_neighbor_events(peer)) |
158 | zlog_debug("%s: peer transfer %p fd %d -> %p fd %d)", | |
159 | from_peer->host, from_peer, from_peer->fd, peer, | |
160 | peer->fd); | |
161 | ||
424ab01d QY |
162 | bgp_writes_off(peer); |
163 | bgp_reads_off(peer); | |
164 | bgp_writes_off(from_peer); | |
165 | bgp_reads_off(from_peer); | |
d62a17ae | 166 | |
74e00a55 S |
167 | /* |
168 | * Before exchanging FD remove doppelganger from | |
169 | * keepalive peer hash. It could be possible conf peer | |
170 | * fd is set to -1. If blocked on lock then keepalive | |
171 | * thread can access peer pointer with fd -1. | |
172 | */ | |
173 | bgp_keepalives_off(from_peer); | |
174 | ||
d62a17ae | 175 | BGP_TIMER_OFF(peer->t_routeadv); |
424ab01d | 176 | BGP_TIMER_OFF(peer->t_connect); |
387f984e QY |
177 | BGP_TIMER_OFF(peer->t_connect_check_r); |
178 | BGP_TIMER_OFF(peer->t_connect_check_w); | |
d62a17ae | 179 | BGP_TIMER_OFF(from_peer->t_routeadv); |
424ab01d | 180 | BGP_TIMER_OFF(from_peer->t_connect); |
387f984e QY |
181 | BGP_TIMER_OFF(from_peer->t_connect_check_r); |
182 | BGP_TIMER_OFF(from_peer->t_connect_check_w); | |
7a86aa5a | 183 | BGP_TIMER_OFF(from_peer->t_process_packet); |
d3ecc69e | 184 | |
becedef6 QY |
185 | /* |
186 | * At this point in time, it is possible that there are packets pending | |
187 | * on various buffers. Those need to be transferred or dropped, | |
188 | * otherwise we'll get spurious failures during session establishment. | |
189 | */ | |
00dffa8c | 190 | frr_with_mutex(&peer->io_mtx, &from_peer->io_mtx) { |
424ab01d QY |
191 | fd = peer->fd; |
192 | peer->fd = from_peer->fd; | |
193 | from_peer->fd = fd; | |
194 | ||
195 | stream_fifo_clean(peer->ibuf); | |
d3ecc69e | 196 | stream_fifo_clean(peer->obuf); |
d3ecc69e | 197 | |
becedef6 QY |
198 | /* |
199 | * this should never happen, since bgp_process_packet() is the | |
200 | * only task that sets and unsets the current packet and it | |
201 | * runs in our pthread. | |
202 | */ | |
424ab01d | 203 | if (peer->curr) { |
af4c2728 | 204 | flog_err( |
e50f7cfd | 205 | EC_BGP_PKT_PROCESS, |
424ab01d QY |
206 | "[%s] Dropping pending packet on connection transfer:", |
207 | peer->host); | |
584470fb DL |
208 | /* there used to be a bgp_packet_dump call here, but |
209 | * that's extremely confusing since there's no way to | |
210 | * identify the packet in MRT dumps or BMP as dropped | |
211 | * due to connection transfer. | |
212 | */ | |
424ab01d QY |
213 | stream_free(peer->curr); |
214 | peer->curr = NULL; | |
215 | } | |
216 | ||
217 | // copy each packet from old peer's output queue to new peer | |
727c4f87 QY |
218 | while (from_peer->obuf->head) |
219 | stream_fifo_push(peer->obuf, | |
220 | stream_fifo_pop(from_peer->obuf)); | |
424ab01d QY |
221 | |
222 | // copy each packet from old peer's input queue to new peer | |
223 | while (from_peer->ibuf->head) | |
224 | stream_fifo_push(peer->ibuf, | |
225 | stream_fifo_pop(from_peer->ibuf)); | |
7db44ec8 | 226 | |
74ffbfe6 QY |
227 | ringbuf_wipe(peer->ibuf_work); |
228 | ringbuf_copy(peer->ibuf_work, from_peer->ibuf_work, | |
229 | ringbuf_remain(from_peer->ibuf_work)); | |
d3ecc69e | 230 | } |
d62a17ae | 231 | |
232 | peer->as = from_peer->as; | |
233 | peer->v_holdtime = from_peer->v_holdtime; | |
234 | peer->v_keepalive = from_peer->v_keepalive; | |
d62a17ae | 235 | peer->v_routeadv = from_peer->v_routeadv; |
236 | peer->v_gr_restart = from_peer->v_gr_restart; | |
237 | peer->cap = from_peer->cap; | |
238 | status = peer->status; | |
239 | pstatus = peer->ostatus; | |
240 | last_evt = peer->last_event; | |
241 | last_maj_evt = peer->last_major_event; | |
242 | peer->status = from_peer->status; | |
243 | peer->ostatus = from_peer->ostatus; | |
244 | peer->last_event = from_peer->last_event; | |
245 | peer->last_major_event = from_peer->last_major_event; | |
246 | from_peer->status = status; | |
247 | from_peer->ostatus = pstatus; | |
248 | from_peer->last_event = last_evt; | |
249 | from_peer->last_major_event = last_maj_evt; | |
250 | peer->remote_id = from_peer->remote_id; | |
3577f1c5 | 251 | peer->last_reset = from_peer->last_reset; |
d62a17ae | 252 | |
253 | if (from_peer->hostname != NULL) { | |
254 | if (peer->hostname) { | |
255 | XFREE(MTYPE_BGP_PEER_HOST, peer->hostname); | |
256 | peer->hostname = NULL; | |
257 | } | |
258 | ||
259 | peer->hostname = from_peer->hostname; | |
260 | from_peer->hostname = NULL; | |
261 | } | |
262 | ||
263 | if (from_peer->domainname != NULL) { | |
264 | if (peer->domainname) { | |
265 | XFREE(MTYPE_BGP_PEER_HOST, peer->domainname); | |
266 | peer->domainname = NULL; | |
267 | } | |
268 | ||
269 | peer->domainname = from_peer->domainname; | |
270 | from_peer->domainname = NULL; | |
271 | } | |
272 | ||
05c7a1cc QY |
273 | FOREACH_AFI_SAFI (afi, safi) { |
274 | peer->af_flags[afi][safi] = from_peer->af_flags[afi][safi]; | |
275 | peer->af_sflags[afi][safi] = from_peer->af_sflags[afi][safi]; | |
276 | peer->af_cap[afi][safi] = from_peer->af_cap[afi][safi]; | |
277 | peer->afc_nego[afi][safi] = from_peer->afc_nego[afi][safi]; | |
278 | peer->afc_adv[afi][safi] = from_peer->afc_adv[afi][safi]; | |
279 | peer->afc_recv[afi][safi] = from_peer->afc_recv[afi][safi]; | |
280 | peer->orf_plist[afi][safi] = from_peer->orf_plist[afi][safi]; | |
281 | } | |
d62a17ae | 282 | |
283 | if (bgp_getsockname(peer) < 0) { | |
af4c2728 | 284 | flog_err( |
450971aa | 285 | EC_LIB_SOCKET, |
d62a17ae | 286 | "%%bgp_getsockname() failed for %s peer %s fd %d (from_peer fd %d)", |
287 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER) | |
288 | ? "accept" | |
289 | : ""), | |
290 | peer->host, peer->fd, from_peer->fd); | |
291 | bgp_stop(peer); | |
292 | bgp_stop(from_peer); | |
293 | return NULL; | |
294 | } | |
295 | if (from_peer->status > Active) { | |
296 | if (bgp_getsockname(from_peer) < 0) { | |
af4c2728 | 297 | flog_err( |
450971aa | 298 | EC_LIB_SOCKET, |
d62a17ae | 299 | "%%bgp_getsockname() failed for %s from_peer %s fd %d (peer fd %d)", |
14454c9f | 300 | |
d62a17ae | 301 | (CHECK_FLAG(from_peer->sflags, |
302 | PEER_STATUS_ACCEPT_PEER) | |
303 | ? "accept" | |
304 | : ""), | |
305 | from_peer->host, from_peer->fd, peer->fd); | |
306 | bgp_stop(from_peer); | |
307 | from_peer = NULL; | |
308 | } | |
309 | } | |
310 | ||
0112e9e0 QY |
311 | |
312 | // Note: peer_xfer_stats() must be called with I/O turned OFF | |
313 | if (from_peer) | |
314 | peer_xfer_stats(peer, from_peer); | |
315 | ||
e2d3a909 | 316 | /* Register peer for NHT. This is to allow RAs to be enabled when |
317 | * needed, even on a passive connection. | |
318 | */ | |
319 | bgp_peer_reg_with_nht(peer); | |
320 | ||
424ab01d QY |
321 | bgp_reads_on(peer); |
322 | bgp_writes_on(peer); | |
7a86aa5a QY |
323 | thread_add_timer_msec(bm->master, bgp_process_packet, peer, 0, |
324 | &peer->t_process_packet); | |
d62a17ae | 325 | |
d62a17ae | 326 | return (peer); |
1ff9a340 DS |
327 | } |
328 | ||
718e3744 | 329 | /* Hook function called after bgp event is occered. And vty's |
330 | neighbor command invoke this function after making neighbor | |
331 | structure. */ | |
d62a17ae | 332 | void bgp_timer_set(struct peer *peer) |
718e3744 | 333 | { |
d62a17ae | 334 | switch (peer->status) { |
335 | case Idle: | |
336 | /* First entry point of peer's finite state machine. In Idle | |
337 | status start timer is on unless peer is shutdown or peer is | |
338 | inactive. All other timer must be turned off */ | |
f62abc7d | 339 | if (BGP_PEER_START_SUPPRESSED(peer) || !peer_active(peer) |
dded74d5 DS |
340 | || (peer->bgp->inst_type != BGP_INSTANCE_TYPE_VIEW && |
341 | peer->bgp->vrf_id == VRF_UNKNOWN)) { | |
d62a17ae | 342 | BGP_TIMER_OFF(peer->t_start); |
343 | } else { | |
344 | BGP_TIMER_ON(peer->t_start, bgp_start_timer, | |
345 | peer->v_start); | |
346 | } | |
347 | BGP_TIMER_OFF(peer->t_connect); | |
348 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 349 | bgp_keepalives_off(peer); |
d62a17ae | 350 | BGP_TIMER_OFF(peer->t_routeadv); |
351 | break; | |
352 | ||
353 | case Connect: | |
354 | /* After start timer is expired, the peer moves to Connect | |
355 | status. Make sure start timer is off and connect timer is | |
356 | on. */ | |
357 | BGP_TIMER_OFF(peer->t_start); | |
358 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
359 | peer->v_connect); | |
360 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 361 | bgp_keepalives_off(peer); |
d62a17ae | 362 | BGP_TIMER_OFF(peer->t_routeadv); |
363 | break; | |
364 | ||
365 | case Active: | |
366 | /* Active is waiting connection from remote peer. And if | |
367 | connect timer is expired, change status to Connect. */ | |
368 | BGP_TIMER_OFF(peer->t_start); | |
369 | /* If peer is passive mode, do not set connect timer. */ | |
370 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE) | |
371 | || CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
372 | BGP_TIMER_OFF(peer->t_connect); | |
373 | } else { | |
374 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
375 | peer->v_connect); | |
376 | } | |
377 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 378 | bgp_keepalives_off(peer); |
d62a17ae | 379 | BGP_TIMER_OFF(peer->t_routeadv); |
380 | break; | |
381 | ||
382 | case OpenSent: | |
383 | /* OpenSent status. */ | |
384 | BGP_TIMER_OFF(peer->t_start); | |
385 | BGP_TIMER_OFF(peer->t_connect); | |
386 | if (peer->v_holdtime != 0) { | |
387 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
388 | peer->v_holdtime); | |
389 | } else { | |
390 | BGP_TIMER_OFF(peer->t_holdtime); | |
391 | } | |
b72b6f4f | 392 | bgp_keepalives_off(peer); |
d62a17ae | 393 | BGP_TIMER_OFF(peer->t_routeadv); |
394 | break; | |
395 | ||
396 | case OpenConfirm: | |
397 | /* OpenConfirm status. */ | |
398 | BGP_TIMER_OFF(peer->t_start); | |
399 | BGP_TIMER_OFF(peer->t_connect); | |
400 | ||
401 | /* If the negotiated Hold Time value is zero, then the Hold Time | |
402 | timer and KeepAlive timers are not started. */ | |
403 | if (peer->v_holdtime == 0) { | |
404 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 405 | bgp_keepalives_off(peer); |
d62a17ae | 406 | } else { |
407 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
408 | peer->v_holdtime); | |
b72b6f4f | 409 | bgp_keepalives_on(peer); |
d62a17ae | 410 | } |
411 | BGP_TIMER_OFF(peer->t_routeadv); | |
412 | break; | |
413 | ||
414 | case Established: | |
415 | /* In Established status start and connect timer is turned | |
416 | off. */ | |
417 | BGP_TIMER_OFF(peer->t_start); | |
418 | BGP_TIMER_OFF(peer->t_connect); | |
419 | ||
420 | /* Same as OpenConfirm, if holdtime is zero then both holdtime | |
421 | and keepalive must be turned off. */ | |
422 | if (peer->v_holdtime == 0) { | |
423 | BGP_TIMER_OFF(peer->t_holdtime); | |
bea01226 | 424 | bgp_keepalives_off(peer); |
d62a17ae | 425 | } else { |
426 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
427 | peer->v_holdtime); | |
bea01226 | 428 | bgp_keepalives_on(peer); |
d62a17ae | 429 | } |
430 | break; | |
431 | case Deleted: | |
432 | BGP_TIMER_OFF(peer->t_gr_restart); | |
433 | BGP_TIMER_OFF(peer->t_gr_stale); | |
434 | BGP_TIMER_OFF(peer->t_pmax_restart); | |
435 | /* fallthru */ | |
436 | case Clearing: | |
437 | BGP_TIMER_OFF(peer->t_start); | |
438 | BGP_TIMER_OFF(peer->t_connect); | |
439 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 440 | bgp_keepalives_off(peer); |
d62a17ae | 441 | BGP_TIMER_OFF(peer->t_routeadv); |
442 | break; | |
718e3744 | 443 | } |
718e3744 | 444 | } |
445 | ||
446 | /* BGP start timer. This function set BGP_Start event to thread value | |
447 | and process event. */ | |
d62a17ae | 448 | static int bgp_start_timer(struct thread *thread) |
718e3744 | 449 | { |
d62a17ae | 450 | struct peer *peer; |
718e3744 | 451 | |
d62a17ae | 452 | peer = THREAD_ARG(thread); |
453 | peer->t_start = NULL; | |
718e3744 | 454 | |
d62a17ae | 455 | if (bgp_debug_neighbor_events(peer)) |
456 | zlog_debug("%s [FSM] Timer (start timer expire).", peer->host); | |
718e3744 | 457 | |
d62a17ae | 458 | THREAD_VAL(thread) = BGP_Start; |
459 | bgp_event(thread); /* bgp_event unlocks peer */ | |
718e3744 | 460 | |
d62a17ae | 461 | return 0; |
718e3744 | 462 | } |
463 | ||
464 | /* BGP connect retry timer. */ | |
d62a17ae | 465 | static int bgp_connect_timer(struct thread *thread) |
718e3744 | 466 | { |
d62a17ae | 467 | struct peer *peer; |
468 | int ret; | |
469 | ||
470 | peer = THREAD_ARG(thread); | |
424ab01d QY |
471 | |
472 | assert(!peer->t_write); | |
473 | assert(!peer->t_read); | |
474 | ||
d62a17ae | 475 | peer->t_connect = NULL; |
476 | ||
477 | if (bgp_debug_neighbor_events(peer)) | |
478 | zlog_debug("%s [FSM] Timer (connect timer expire)", peer->host); | |
479 | ||
480 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) { | |
481 | bgp_stop(peer); | |
482 | ret = -1; | |
483 | } else { | |
484 | THREAD_VAL(thread) = ConnectRetry_timer_expired; | |
485 | bgp_event(thread); /* bgp_event unlocks peer */ | |
486 | ret = 0; | |
487 | } | |
488 | ||
489 | return ret; | |
718e3744 | 490 | } |
491 | ||
492 | /* BGP holdtime timer. */ | |
d62a17ae | 493 | static int bgp_holdtime_timer(struct thread *thread) |
718e3744 | 494 | { |
d62a17ae | 495 | struct peer *peer; |
718e3744 | 496 | |
d62a17ae | 497 | peer = THREAD_ARG(thread); |
498 | peer->t_holdtime = NULL; | |
718e3744 | 499 | |
d62a17ae | 500 | if (bgp_debug_neighbor_events(peer)) |
501 | zlog_debug("%s [FSM] Timer (holdtime timer expire)", | |
502 | peer->host); | |
718e3744 | 503 | |
d62a17ae | 504 | THREAD_VAL(thread) = Hold_Timer_expired; |
505 | bgp_event(thread); /* bgp_event unlocks peer */ | |
718e3744 | 506 | |
d62a17ae | 507 | return 0; |
718e3744 | 508 | } |
509 | ||
d62a17ae | 510 | int bgp_routeadv_timer(struct thread *thread) |
718e3744 | 511 | { |
d62a17ae | 512 | struct peer *peer; |
718e3744 | 513 | |
d62a17ae | 514 | peer = THREAD_ARG(thread); |
515 | peer->t_routeadv = NULL; | |
718e3744 | 516 | |
d62a17ae | 517 | if (bgp_debug_neighbor_events(peer)) |
518 | zlog_debug("%s [FSM] Timer (routeadv timer expire)", | |
519 | peer->host); | |
718e3744 | 520 | |
d62a17ae | 521 | peer->synctime = bgp_clock(); |
718e3744 | 522 | |
a9794991 | 523 | thread_add_timer_msec(bm->master, bgp_generate_updgrp_packets, peer, 0, |
424ab01d QY |
524 | &peer->t_generate_updgrp_packets); |
525 | ||
d62a17ae | 526 | /* MRAI timer will be started again when FIFO is built, no need to |
527 | * do it here. | |
528 | */ | |
529 | return 0; | |
718e3744 | 530 | } |
531 | ||
e0701b79 | 532 | /* BGP Peer Down Cause */ |
2b64873d | 533 | const char *const peer_down_str[] = {"", |
d62a17ae | 534 | "Router ID changed", |
535 | "Remote AS changed", | |
536 | "Local AS change", | |
537 | "Cluster ID changed", | |
538 | "Confederation identifier changed", | |
539 | "Confederation peer changed", | |
540 | "RR client config change", | |
541 | "RS client config change", | |
542 | "Update source change", | |
543 | "Address family activated", | |
544 | "Admin. shutdown", | |
545 | "User reset", | |
546 | "BGP Notification received", | |
547 | "BGP Notification send", | |
548 | "Peer closed the session", | |
549 | "Neighbor deleted", | |
550 | "Peer-group add member", | |
551 | "Peer-group delete member", | |
552 | "Capability changed", | |
553 | "Passive config change", | |
554 | "Multihop config change", | |
555 | "NSF peer closed the session", | |
556 | "Intf peering v6only config change", | |
557 | "BFD down received", | |
558 | "Interface down", | |
05912a17 | 559 | "Neighbor address lost", |
3577f1c5 | 560 | "Waiting for NHT", |
05912a17 DD |
561 | "Waiting for Peer IPv6 LLA", |
562 | "Waiting for VRF to be initialized", | |
563 | "No AFI/SAFI activated for peer"}; | |
d62a17ae | 564 | |
565 | static int bgp_graceful_restart_timer_expire(struct thread *thread) | |
e0701b79 | 566 | { |
d62a17ae | 567 | struct peer *peer; |
568 | afi_t afi; | |
569 | safi_t safi; | |
570 | ||
571 | peer = THREAD_ARG(thread); | |
572 | peer->t_gr_restart = NULL; | |
573 | ||
574 | /* NSF delete stale route */ | |
575 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 576 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) |
d62a17ae | 577 | if (peer->nsf[afi][safi]) |
578 | bgp_clear_stale_route(peer, afi, safi); | |
579 | ||
580 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
581 | BGP_TIMER_OFF(peer->t_gr_stale); | |
582 | ||
583 | if (bgp_debug_neighbor_events(peer)) { | |
584 | zlog_debug("%s graceful restart timer expired", peer->host); | |
585 | zlog_debug("%s graceful restart stalepath timer stopped", | |
586 | peer->host); | |
587 | } | |
93406d87 | 588 | |
d62a17ae | 589 | bgp_timer_set(peer); |
93406d87 | 590 | |
d62a17ae | 591 | return 0; |
93406d87 | 592 | } |
593 | ||
d62a17ae | 594 | static int bgp_graceful_stale_timer_expire(struct thread *thread) |
93406d87 | 595 | { |
d62a17ae | 596 | struct peer *peer; |
597 | afi_t afi; | |
598 | safi_t safi; | |
93406d87 | 599 | |
d62a17ae | 600 | peer = THREAD_ARG(thread); |
601 | peer->t_gr_stale = NULL; | |
93406d87 | 602 | |
d62a17ae | 603 | if (bgp_debug_neighbor_events(peer)) |
604 | zlog_debug("%s graceful restart stalepath timer expired", | |
605 | peer->host); | |
93406d87 | 606 | |
d62a17ae | 607 | /* NSF delete stale route */ |
608 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 609 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) |
d62a17ae | 610 | if (peer->nsf[afi][safi]) |
611 | bgp_clear_stale_route(peer, afi, safi); | |
93406d87 | 612 | |
d62a17ae | 613 | return 0; |
93406d87 | 614 | } |
615 | ||
d62a17ae | 616 | static int bgp_update_delay_applicable(struct bgp *bgp) |
f188f2c4 | 617 | { |
d62a17ae | 618 | /* update_delay_over flag should be reset (set to 0) for any new |
619 | applicability of the update-delay during BGP process lifetime. | |
620 | And it should be set after an occurence of the update-delay is | |
621 | over)*/ | |
622 | if (!bgp->update_delay_over) | |
623 | return 1; | |
624 | ||
625 | return 0; | |
f188f2c4 DS |
626 | } |
627 | ||
d62a17ae | 628 | int bgp_update_delay_active(struct bgp *bgp) |
f188f2c4 | 629 | { |
d62a17ae | 630 | if (bgp->t_update_delay) |
631 | return 1; | |
f188f2c4 | 632 | |
d62a17ae | 633 | return 0; |
f188f2c4 DS |
634 | } |
635 | ||
d62a17ae | 636 | int bgp_update_delay_configured(struct bgp *bgp) |
f188f2c4 | 637 | { |
d62a17ae | 638 | if (bgp->v_update_delay) |
639 | return 1; | |
f188f2c4 | 640 | |
d62a17ae | 641 | return 0; |
f188f2c4 DS |
642 | } |
643 | ||
644 | /* Do the post-processing needed when bgp comes out of the read-only mode | |
645 | on ending the update delay. */ | |
d62a17ae | 646 | void bgp_update_delay_end(struct bgp *bgp) |
f188f2c4 | 647 | { |
d62a17ae | 648 | THREAD_TIMER_OFF(bgp->t_update_delay); |
649 | THREAD_TIMER_OFF(bgp->t_establish_wait); | |
650 | ||
651 | /* Reset update-delay related state */ | |
652 | bgp->update_delay_over = 1; | |
653 | bgp->established = 0; | |
654 | bgp->restarted_peers = 0; | |
655 | bgp->implicit_eors = 0; | |
656 | bgp->explicit_eors = 0; | |
657 | ||
658 | quagga_timestamp(3, bgp->update_delay_end_time, | |
659 | sizeof(bgp->update_delay_end_time)); | |
660 | ||
661 | /* | |
662 | * Add an end-of-initial-update marker to the main process queues so | |
663 | * that | |
664 | * the route advertisement timer for the peers can be started. Also set | |
665 | * the zebra and peer update hold flags. These flags are used to achieve | |
666 | * three stages in the update-delay post processing: | |
667 | * 1. Finish best-path selection for all the prefixes held on the | |
668 | * queues. | |
669 | * (routes in BGP are updated, and peers sync queues are populated | |
670 | * too) | |
671 | * 2. As the eoiu mark is reached in the bgp process routine, ship all | |
672 | * the | |
673 | * routes to zebra. With that zebra should see updates from BGP | |
674 | * close | |
675 | * to each other. | |
676 | * 3. Unblock the peer update writes. With that peer update packing | |
677 | * with | |
678 | * the prefixes should be at its maximum. | |
679 | */ | |
680 | bgp_add_eoiu_mark(bgp); | |
681 | bgp->main_zebra_update_hold = 1; | |
682 | bgp->main_peers_update_hold = 1; | |
683 | ||
684 | /* Resume the queue processing. This should trigger the event that would | |
685 | take | |
686 | care of processing any work that was queued during the read-only | |
687 | mode. */ | |
688 | work_queue_unplug(bm->process_main_queue); | |
f188f2c4 DS |
689 | } |
690 | ||
cb1faec9 DS |
691 | /** |
692 | * see bgp_fsm.h | |
693 | */ | |
d62a17ae | 694 | void bgp_start_routeadv(struct bgp *bgp) |
cb1faec9 | 695 | { |
d62a17ae | 696 | struct listnode *node, *nnode; |
697 | struct peer *peer; | |
cb1faec9 | 698 | |
d62a17ae | 699 | zlog_info("bgp_start_routeadv(), update hold status %d", |
700 | bgp->main_peers_update_hold); | |
4a16ae86 | 701 | |
d62a17ae | 702 | if (bgp->main_peers_update_hold) |
703 | return; | |
4a16ae86 | 704 | |
d62a17ae | 705 | quagga_timestamp(3, bgp->update_delay_peers_resume_time, |
706 | sizeof(bgp->update_delay_peers_resume_time)); | |
4a16ae86 | 707 | |
d62a17ae | 708 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) { |
709 | if (peer->status != Established) | |
710 | continue; | |
711 | BGP_TIMER_OFF(peer->t_routeadv); | |
712 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
713 | } | |
cb1faec9 DS |
714 | } |
715 | ||
716 | /** | |
717 | * see bgp_fsm.h | |
718 | */ | |
d62a17ae | 719 | void bgp_adjust_routeadv(struct peer *peer) |
cb1faec9 | 720 | { |
d62a17ae | 721 | time_t nowtime = bgp_clock(); |
722 | double diff; | |
723 | unsigned long remain; | |
724 | ||
725 | /* Bypass checks for special case of MRAI being 0 */ | |
726 | if (peer->v_routeadv == 0) { | |
727 | /* Stop existing timer, just in case it is running for a | |
728 | * different | |
729 | * duration and schedule write thread immediately. | |
730 | */ | |
731 | if (peer->t_routeadv) | |
732 | BGP_TIMER_OFF(peer->t_routeadv); | |
733 | ||
734 | peer->synctime = bgp_clock(); | |
a9794991 | 735 | thread_add_timer_msec(bm->master, bgp_generate_updgrp_packets, |
424ab01d QY |
736 | peer, 0, |
737 | &peer->t_generate_updgrp_packets); | |
d62a17ae | 738 | return; |
739 | } | |
740 | ||
741 | ||
742 | /* | |
743 | * CASE I: | |
744 | * If the last update was written more than MRAI back, expire the timer | |
745 | * instantly so that we can send the update out sooner. | |
746 | * | |
747 | * <------- MRAI ---------> | |
748 | * |-----------------|-----------------------| | |
749 | * <------------- m ------------> | |
750 | * ^ ^ ^ | |
751 | * | | | | |
752 | * | | current time | |
753 | * | timer start | |
754 | * last write | |
755 | * | |
756 | * m > MRAI | |
757 | */ | |
758 | diff = difftime(nowtime, peer->last_update); | |
759 | if (diff > (double)peer->v_routeadv) { | |
760 | BGP_TIMER_OFF(peer->t_routeadv); | |
761 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
762 | return; | |
763 | } | |
764 | ||
765 | /* | |
766 | * CASE II: | |
767 | * - Find when to expire the MRAI timer. | |
768 | * If MRAI timer is not active, assume we can start it now. | |
769 | * | |
770 | * <------- MRAI ---------> | |
771 | * |------------|-----------------------| | |
772 | * <-------- m ----------><----- r -----> | |
773 | * ^ ^ ^ | |
774 | * | | | | |
775 | * | | current time | |
776 | * | timer start | |
777 | * last write | |
778 | * | |
779 | * (MRAI - m) < r | |
780 | */ | |
781 | if (peer->t_routeadv) | |
782 | remain = thread_timer_remain_second(peer->t_routeadv); | |
783 | else | |
784 | remain = peer->v_routeadv; | |
785 | diff = peer->v_routeadv - diff; | |
786 | if (diff <= (double)remain) { | |
787 | BGP_TIMER_OFF(peer->t_routeadv); | |
788 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, diff); | |
789 | } | |
cb1faec9 DS |
790 | } |
791 | ||
d62a17ae | 792 | static int bgp_maxmed_onstartup_applicable(struct bgp *bgp) |
abc920f8 | 793 | { |
d62a17ae | 794 | if (!bgp->maxmed_onstartup_over) |
795 | return 1; | |
abc920f8 | 796 | |
d62a17ae | 797 | return 0; |
abc920f8 DS |
798 | } |
799 | ||
d62a17ae | 800 | int bgp_maxmed_onstartup_configured(struct bgp *bgp) |
abc920f8 | 801 | { |
d62a17ae | 802 | if (bgp->v_maxmed_onstartup != BGP_MAXMED_ONSTARTUP_UNCONFIGURED) |
803 | return 1; | |
abc920f8 | 804 | |
d62a17ae | 805 | return 0; |
abc920f8 DS |
806 | } |
807 | ||
d62a17ae | 808 | int bgp_maxmed_onstartup_active(struct bgp *bgp) |
abc920f8 | 809 | { |
d62a17ae | 810 | if (bgp->t_maxmed_onstartup) |
811 | return 1; | |
abc920f8 | 812 | |
d62a17ae | 813 | return 0; |
abc920f8 DS |
814 | } |
815 | ||
d62a17ae | 816 | void bgp_maxmed_update(struct bgp *bgp) |
abc920f8 | 817 | { |
d7c0a89a QY |
818 | uint8_t maxmed_active; |
819 | uint32_t maxmed_value; | |
d62a17ae | 820 | |
821 | if (bgp->v_maxmed_admin) { | |
822 | maxmed_active = 1; | |
823 | maxmed_value = bgp->maxmed_admin_value; | |
824 | } else if (bgp->t_maxmed_onstartup) { | |
825 | maxmed_active = 1; | |
826 | maxmed_value = bgp->maxmed_onstartup_value; | |
827 | } else { | |
828 | maxmed_active = 0; | |
829 | maxmed_value = BGP_MAXMED_VALUE_DEFAULT; | |
830 | } | |
831 | ||
832 | if (bgp->maxmed_active != maxmed_active | |
833 | || bgp->maxmed_value != maxmed_value) { | |
834 | bgp->maxmed_active = maxmed_active; | |
835 | bgp->maxmed_value = maxmed_value; | |
836 | ||
837 | update_group_announce(bgp); | |
838 | } | |
abc920f8 DS |
839 | } |
840 | ||
841 | /* The maxmed onstartup timer expiry callback. */ | |
d62a17ae | 842 | static int bgp_maxmed_onstartup_timer(struct thread *thread) |
abc920f8 | 843 | { |
d62a17ae | 844 | struct bgp *bgp; |
abc920f8 | 845 | |
d62a17ae | 846 | zlog_info("Max med on startup ended - timer expired."); |
abc920f8 | 847 | |
d62a17ae | 848 | bgp = THREAD_ARG(thread); |
849 | THREAD_TIMER_OFF(bgp->t_maxmed_onstartup); | |
850 | bgp->maxmed_onstartup_over = 1; | |
abc920f8 | 851 | |
d62a17ae | 852 | bgp_maxmed_update(bgp); |
abc920f8 | 853 | |
d62a17ae | 854 | return 0; |
abc920f8 DS |
855 | } |
856 | ||
d62a17ae | 857 | static void bgp_maxmed_onstartup_begin(struct bgp *bgp) |
abc920f8 | 858 | { |
d62a17ae | 859 | /* Applicable only once in the process lifetime on the startup */ |
860 | if (bgp->maxmed_onstartup_over) | |
861 | return; | |
abc920f8 | 862 | |
d62a17ae | 863 | zlog_info("Begin maxmed onstartup mode - timer %d seconds", |
864 | bgp->v_maxmed_onstartup); | |
abc920f8 | 865 | |
d62a17ae | 866 | thread_add_timer(bm->master, bgp_maxmed_onstartup_timer, bgp, |
867 | bgp->v_maxmed_onstartup, &bgp->t_maxmed_onstartup); | |
abc920f8 | 868 | |
d62a17ae | 869 | if (!bgp->v_maxmed_admin) { |
870 | bgp->maxmed_active = 1; | |
871 | bgp->maxmed_value = bgp->maxmed_onstartup_value; | |
872 | } | |
abc920f8 | 873 | |
d62a17ae | 874 | /* Route announce to all peers should happen after this in |
875 | * bgp_establish() */ | |
abc920f8 DS |
876 | } |
877 | ||
d62a17ae | 878 | static void bgp_maxmed_onstartup_process_status_change(struct peer *peer) |
abc920f8 | 879 | { |
d62a17ae | 880 | if (peer->status == Established && !peer->bgp->established) { |
881 | bgp_maxmed_onstartup_begin(peer->bgp); | |
882 | } | |
abc920f8 DS |
883 | } |
884 | ||
f188f2c4 | 885 | /* The update delay timer expiry callback. */ |
d62a17ae | 886 | static int bgp_update_delay_timer(struct thread *thread) |
f188f2c4 | 887 | { |
d62a17ae | 888 | struct bgp *bgp; |
f188f2c4 | 889 | |
d62a17ae | 890 | zlog_info("Update delay ended - timer expired."); |
f188f2c4 | 891 | |
d62a17ae | 892 | bgp = THREAD_ARG(thread); |
893 | THREAD_TIMER_OFF(bgp->t_update_delay); | |
894 | bgp_update_delay_end(bgp); | |
f188f2c4 | 895 | |
d62a17ae | 896 | return 0; |
f188f2c4 DS |
897 | } |
898 | ||
899 | /* The establish wait timer expiry callback. */ | |
d62a17ae | 900 | static int bgp_establish_wait_timer(struct thread *thread) |
f188f2c4 | 901 | { |
d62a17ae | 902 | struct bgp *bgp; |
f188f2c4 | 903 | |
d62a17ae | 904 | zlog_info("Establish wait - timer expired."); |
f188f2c4 | 905 | |
d62a17ae | 906 | bgp = THREAD_ARG(thread); |
907 | THREAD_TIMER_OFF(bgp->t_establish_wait); | |
908 | bgp_check_update_delay(bgp); | |
f188f2c4 | 909 | |
d62a17ae | 910 | return 0; |
f188f2c4 DS |
911 | } |
912 | ||
913 | /* Steps to begin the update delay: | |
914 | - initialize queues if needed | |
915 | - stop the queue processing | |
916 | - start the timer */ | |
d62a17ae | 917 | static void bgp_update_delay_begin(struct bgp *bgp) |
f188f2c4 | 918 | { |
d62a17ae | 919 | struct listnode *node, *nnode; |
920 | struct peer *peer; | |
f188f2c4 | 921 | |
d62a17ae | 922 | /* Stop the processing of queued work. Enqueue shall continue */ |
923 | work_queue_plug(bm->process_main_queue); | |
f188f2c4 | 924 | |
d62a17ae | 925 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) |
926 | peer->update_delay_over = 0; | |
f188f2c4 | 927 | |
d62a17ae | 928 | /* Start the update-delay timer */ |
929 | thread_add_timer(bm->master, bgp_update_delay_timer, bgp, | |
930 | bgp->v_update_delay, &bgp->t_update_delay); | |
f188f2c4 | 931 | |
d62a17ae | 932 | if (bgp->v_establish_wait != bgp->v_update_delay) |
933 | thread_add_timer(bm->master, bgp_establish_wait_timer, bgp, | |
934 | bgp->v_establish_wait, &bgp->t_establish_wait); | |
f188f2c4 | 935 | |
d62a17ae | 936 | quagga_timestamp(3, bgp->update_delay_begin_time, |
937 | sizeof(bgp->update_delay_begin_time)); | |
f188f2c4 DS |
938 | } |
939 | ||
d62a17ae | 940 | static void bgp_update_delay_process_status_change(struct peer *peer) |
f188f2c4 | 941 | { |
d62a17ae | 942 | if (peer->status == Established) { |
943 | if (!peer->bgp->established++) { | |
944 | bgp_update_delay_begin(peer->bgp); | |
945 | zlog_info( | |
946 | "Begin read-only mode - update-delay timer %d seconds", | |
947 | peer->bgp->v_update_delay); | |
948 | } | |
949 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_BIT_RCV)) | |
950 | bgp_update_restarted_peers(peer); | |
951 | } | |
952 | if (peer->ostatus == Established | |
953 | && bgp_update_delay_active(peer->bgp)) { | |
954 | /* Adjust the update-delay state to account for this flap. | |
955 | NOTE: Intentionally skipping adjusting implicit_eors or | |
956 | explicit_eors | |
957 | counters. Extra sanity check in bgp_check_update_delay() | |
958 | should | |
959 | be enough to take care of any additive discrepancy in bgp eor | |
960 | counters */ | |
961 | peer->bgp->established--; | |
962 | peer->update_delay_over = 0; | |
963 | } | |
f188f2c4 DS |
964 | } |
965 | ||
0437e105 | 966 | /* Called after event occurred, this function change status and reset |
200df115 | 967 | read/write and timer thread. */ |
d62a17ae | 968 | void bgp_fsm_change_status(struct peer *peer, int status) |
200df115 | 969 | { |
36dc7588 | 970 | struct bgp *bgp; |
971 | uint32_t peer_count; | |
1ff9a340 | 972 | |
36dc7588 | 973 | bgp = peer->bgp; |
974 | peer_count = bgp->established_peers; | |
975 | ||
976 | if (status == Established) | |
977 | bgp->established_peers++; | |
978 | else if ((peer->status == Established) && (status != Established)) | |
979 | bgp->established_peers--; | |
980 | ||
1cfe005d DS |
981 | if (bgp_debug_neighbor_events(peer)) { |
982 | struct vrf *vrf = vrf_lookup_by_id(bgp->vrf_id); | |
983 | ||
984 | zlog_debug("%s : vrf %s(%u), Status: %s established_peers %u", __func__, | |
985 | vrf ? vrf->name : "Unknown", bgp->vrf_id, | |
986 | lookup_msg(bgp_status_msg, status, NULL), | |
987 | bgp->established_peers); | |
988 | } | |
989 | ||
36dc7588 | 990 | /* Set to router ID to the value provided by RIB if there are no peers |
991 | * in the established state and peer count did not change | |
992 | */ | |
993 | if ((peer_count != bgp->established_peers) && | |
994 | (bgp->established_peers == 0)) | |
995 | bgp_router_id_zebra_bump(bgp->vrf_id, NULL); | |
996 | ||
d62a17ae | 997 | /* Transition into Clearing or Deleted must /always/ clear all routes.. |
998 | * (and must do so before actually changing into Deleted.. | |
999 | */ | |
1000 | if (status >= Clearing) { | |
1001 | bgp_clear_route_all(peer); | |
1002 | ||
1003 | /* If no route was queued for the clear-node processing, | |
1004 | * generate the | |
1005 | * completion event here. This is needed because if there are no | |
1006 | * routes | |
1007 | * to trigger the background clear-node thread, the event won't | |
1008 | * get | |
1009 | * generated and the peer would be stuck in Clearing. Note that | |
1010 | * this | |
1011 | * event is for the peer and helps the peer transition out of | |
1012 | * Clearing | |
1013 | * state; it should not be generated per (AFI,SAFI). The event | |
1014 | * is | |
1015 | * directly posted here without calling clear_node_complete() as | |
1016 | * we | |
1017 | * shouldn't do an extra unlock. This event will get processed | |
1018 | * after | |
1019 | * the state change that happens below, so peer will be in | |
1020 | * Clearing | |
1021 | * (or Deleted). | |
1022 | */ | |
1023 | if (!work_queue_is_scheduled(peer->clear_node_queue)) | |
1024 | BGP_EVENT_ADD(peer, Clearing_Completed); | |
1025 | } | |
1026 | ||
1027 | /* Preserve old status and change into new status. */ | |
1028 | peer->ostatus = peer->status; | |
1029 | peer->status = status; | |
1030 | ||
1031 | /* Save event that caused status change. */ | |
1032 | peer->last_major_event = peer->cur_event; | |
1033 | ||
7d8d0eab MKS |
1034 | /* Operations after status change */ |
1035 | hook_call(peer_status_changed, peer); | |
1036 | ||
d62a17ae | 1037 | if (status == Established) |
1038 | UNSET_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER); | |
1039 | ||
1040 | /* If max-med processing is applicable, do the necessary. */ | |
1041 | if (status == Established) { | |
1042 | if (bgp_maxmed_onstartup_configured(peer->bgp) | |
1043 | && bgp_maxmed_onstartup_applicable(peer->bgp)) | |
1044 | bgp_maxmed_onstartup_process_status_change(peer); | |
1045 | else | |
1046 | peer->bgp->maxmed_onstartup_over = 1; | |
1047 | } | |
1048 | ||
1049 | /* If update-delay processing is applicable, do the necessary. */ | |
1050 | if (bgp_update_delay_configured(peer->bgp) | |
1051 | && bgp_update_delay_applicable(peer->bgp)) | |
1052 | bgp_update_delay_process_status_change(peer); | |
1053 | ||
1054 | if (bgp_debug_neighbor_events(peer)) | |
1055 | zlog_debug("%s went from %s to %s", peer->host, | |
1056 | lookup_msg(bgp_status_msg, peer->ostatus, NULL), | |
1057 | lookup_msg(bgp_status_msg, peer->status, NULL)); | |
200df115 | 1058 | } |
1059 | ||
3117b5c4 | 1060 | /* Flush the event queue and ensure the peer is shut down */ |
d62a17ae | 1061 | static int bgp_clearing_completed(struct peer *peer) |
3117b5c4 | 1062 | { |
d62a17ae | 1063 | int rc = bgp_stop(peer); |
1ff9a340 | 1064 | |
d62a17ae | 1065 | if (rc >= 0) |
1066 | BGP_EVENT_FLUSH(peer); | |
3117b5c4 | 1067 | |
d62a17ae | 1068 | return rc; |
3117b5c4 SH |
1069 | } |
1070 | ||
718e3744 | 1071 | /* Administrative BGP peer stop event. */ |
3117b5c4 | 1072 | /* May be called multiple times for the same peer */ |
d62a17ae | 1073 | int bgp_stop(struct peer *peer) |
718e3744 | 1074 | { |
d62a17ae | 1075 | afi_t afi; |
1076 | safi_t safi; | |
1077 | char orf_name[BUFSIZ]; | |
1078 | int ret = 0; | |
1079 | ||
1080 | if (peer_dynamic_neighbor(peer) | |
1081 | && !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
1082 | if (bgp_debug_neighbor_events(peer)) | |
1083 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1084 | peer_delete(peer); | |
1085 | return -1; | |
c22767d8 | 1086 | } |
848973c7 | 1087 | |
d62a17ae | 1088 | /* Can't do this in Clearing; events are used for state transitions */ |
1089 | if (peer->status != Clearing) { | |
1090 | /* Delete all existing events of the peer */ | |
1091 | BGP_EVENT_FLUSH(peer); | |
93406d87 | 1092 | } |
d62a17ae | 1093 | |
1094 | /* Increment Dropped count. */ | |
1095 | if (peer->status == Established) { | |
1096 | peer->dropped++; | |
1097 | ||
1098 | /* bgp log-neighbor-changes of neighbor Down */ | |
1099 | if (bgp_flag_check(peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { | |
1100 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); | |
1101 | zlog_info( | |
1102 | "%%ADJCHANGE: neighbor %s(%s) in vrf %s Down %s", | |
1103 | peer->host, | |
1104 | (peer->hostname) ? peer->hostname : "Unknown", | |
5742e42b DS |
1105 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) |
1106 | ? vrf->name | |
1107 | : VRF_DEFAULT_NAME) | |
d62a17ae | 1108 | : "", |
1109 | peer_down_str[(int)peer->last_reset]); | |
1110 | } | |
1111 | ||
1112 | /* graceful restart */ | |
1113 | if (peer->t_gr_stale) { | |
1114 | BGP_TIMER_OFF(peer->t_gr_stale); | |
1115 | if (bgp_debug_neighbor_events(peer)) | |
1116 | zlog_debug( | |
1117 | "%s graceful restart stalepath timer stopped", | |
1118 | peer->host); | |
1119 | } | |
1120 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
1121 | if (bgp_debug_neighbor_events(peer)) { | |
1122 | zlog_debug( | |
1123 | "%s graceful restart timer started for %d sec", | |
1124 | peer->host, peer->v_gr_restart); | |
1125 | zlog_debug( | |
1126 | "%s graceful restart stalepath timer started for %d sec", | |
1127 | peer->host, peer->bgp->stalepath_time); | |
1128 | } | |
1129 | BGP_TIMER_ON(peer->t_gr_restart, | |
1130 | bgp_graceful_restart_timer_expire, | |
1131 | peer->v_gr_restart); | |
1132 | BGP_TIMER_ON(peer->t_gr_stale, | |
1133 | bgp_graceful_stale_timer_expire, | |
1134 | peer->bgp->stalepath_time); | |
1135 | } else { | |
1136 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1137 | ||
1138 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
996c9314 LB |
1139 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; |
1140 | safi++) | |
d62a17ae | 1141 | peer->nsf[afi][safi] = 0; |
1142 | } | |
1143 | ||
1144 | /* set last reset time */ | |
1145 | peer->resettime = peer->uptime = bgp_clock(); | |
1146 | ||
1147 | if (BGP_DEBUG(update_groups, UPDATE_GROUPS)) | |
1148 | zlog_debug("%s remove from all update group", | |
1149 | peer->host); | |
1150 | update_group_remove_peer_afs(peer); | |
1151 | ||
1152 | hook_call(peer_backward_transition, peer); | |
1153 | ||
1154 | /* Reset peer synctime */ | |
1155 | peer->synctime = 0; | |
93406d87 | 1156 | } |
93406d87 | 1157 | |
424ab01d | 1158 | /* stop keepalives */ |
b72b6f4f | 1159 | bgp_keepalives_off(peer); |
424ab01d QY |
1160 | |
1161 | /* Stop read and write threads. */ | |
1162 | bgp_writes_off(peer); | |
1163 | bgp_reads_off(peer); | |
1164 | ||
387f984e QY |
1165 | THREAD_OFF(peer->t_connect_check_r); |
1166 | THREAD_OFF(peer->t_connect_check_w); | |
d62a17ae | 1167 | |
1168 | /* Stop all timers. */ | |
1169 | BGP_TIMER_OFF(peer->t_start); | |
1170 | BGP_TIMER_OFF(peer->t_connect); | |
1171 | BGP_TIMER_OFF(peer->t_holdtime); | |
d62a17ae | 1172 | BGP_TIMER_OFF(peer->t_routeadv); |
d62a17ae | 1173 | |
1174 | /* Clear input and output buffer. */ | |
00dffa8c | 1175 | frr_with_mutex(&peer->io_mtx) { |
424ab01d QY |
1176 | if (peer->ibuf) |
1177 | stream_fifo_clean(peer->ibuf); | |
d3ecc69e QY |
1178 | if (peer->obuf) |
1179 | stream_fifo_clean(peer->obuf); | |
424ab01d QY |
1180 | |
1181 | if (peer->ibuf_work) | |
74ffbfe6 | 1182 | ringbuf_wipe(peer->ibuf_work); |
424ab01d QY |
1183 | if (peer->obuf_work) |
1184 | stream_reset(peer->obuf_work); | |
1185 | ||
1186 | if (peer->curr) { | |
1187 | stream_free(peer->curr); | |
1188 | peer->curr = NULL; | |
1189 | } | |
d3ecc69e | 1190 | } |
d62a17ae | 1191 | |
1192 | /* Close of file descriptor. */ | |
1193 | if (peer->fd >= 0) { | |
1194 | close(peer->fd); | |
1195 | peer->fd = -1; | |
93406d87 | 1196 | } |
1197 | ||
05c7a1cc QY |
1198 | FOREACH_AFI_SAFI (afi, safi) { |
1199 | /* Reset all negotiated variables */ | |
1200 | peer->afc_nego[afi][safi] = 0; | |
1201 | peer->afc_adv[afi][safi] = 0; | |
1202 | peer->afc_recv[afi][safi] = 0; | |
1203 | ||
1204 | /* peer address family capability flags*/ | |
1205 | peer->af_cap[afi][safi] = 0; | |
1206 | ||
1207 | /* peer address family status flags*/ | |
1208 | peer->af_sflags[afi][safi] = 0; | |
1209 | ||
1210 | /* Received ORF prefix-filter */ | |
1211 | peer->orf_plist[afi][safi] = NULL; | |
1212 | ||
1213 | if ((peer->status == OpenConfirm) | |
1214 | || (peer->status == Established)) { | |
1215 | /* ORF received prefix-filter pnt */ | |
1216 | sprintf(orf_name, "%s.%d.%d", peer->host, afi, safi); | |
1217 | prefix_bgp_orf_remove_all(afi, orf_name); | |
d62a17ae | 1218 | } |
05c7a1cc | 1219 | } |
d62a17ae | 1220 | |
1221 | /* Reset keepalive and holdtime */ | |
b90a8e13 | 1222 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER)) { |
d62a17ae | 1223 | peer->v_keepalive = peer->keepalive; |
1224 | peer->v_holdtime = peer->holdtime; | |
1225 | } else { | |
1226 | peer->v_keepalive = peer->bgp->default_keepalive; | |
1227 | peer->v_holdtime = peer->bgp->default_holdtime; | |
1ff9a340 | 1228 | } |
d62a17ae | 1229 | |
1230 | peer->update_time = 0; | |
1231 | ||
1232 | /* Until we are sure that there is no problem about prefix count | |
1233 | this should be commented out.*/ | |
718e3744 | 1234 | #if 0 |
1235 | /* Reset prefix count */ | |
1236 | peer->pcount[AFI_IP][SAFI_UNICAST] = 0; | |
1237 | peer->pcount[AFI_IP][SAFI_MULTICAST] = 0; | |
cd1964ff | 1238 | peer->pcount[AFI_IP][SAFI_LABELED_UNICAST] = 0; |
718e3744 | 1239 | peer->pcount[AFI_IP][SAFI_MPLS_VPN] = 0; |
1240 | peer->pcount[AFI_IP6][SAFI_UNICAST] = 0; | |
1241 | peer->pcount[AFI_IP6][SAFI_MULTICAST] = 0; | |
cd1964ff | 1242 | peer->pcount[AFI_IP6][SAFI_LABELED_UNICAST] = 0; |
718e3744 | 1243 | #endif /* 0 */ |
1244 | ||
d62a17ae | 1245 | if (!CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE) |
1246 | && !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
1247 | peer_delete(peer); | |
1248 | ret = -1; | |
1249 | } else { | |
1250 | bgp_peer_conf_if_to_su_update(peer); | |
1251 | } | |
1252 | ||
1253 | return ret; | |
718e3744 | 1254 | } |
1255 | ||
1256 | /* BGP peer is stoped by the error. */ | |
d62a17ae | 1257 | static int bgp_stop_with_error(struct peer *peer) |
718e3744 | 1258 | { |
d62a17ae | 1259 | /* Double start timer. */ |
1260 | peer->v_start *= 2; | |
1261 | ||
1262 | /* Overflow check. */ | |
1263 | if (peer->v_start >= (60 * 2)) | |
1264 | peer->v_start = (60 * 2); | |
1265 | ||
1266 | if (peer_dynamic_neighbor(peer)) { | |
1267 | if (bgp_debug_neighbor_events(peer)) | |
1268 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1269 | peer_delete(peer); | |
1270 | return -1; | |
1271 | } | |
1272 | ||
1273 | return (bgp_stop(peer)); | |
718e3744 | 1274 | } |
1275 | ||
397b5bde LR |
1276 | |
1277 | /* something went wrong, send notify and tear down */ | |
d7c0a89a QY |
1278 | static int bgp_stop_with_notify(struct peer *peer, uint8_t code, |
1279 | uint8_t sub_code) | |
397b5bde | 1280 | { |
d62a17ae | 1281 | /* Send notify to remote peer */ |
1282 | bgp_notify_send(peer, code, sub_code); | |
1283 | ||
1284 | if (peer_dynamic_neighbor(peer)) { | |
1285 | if (bgp_debug_neighbor_events(peer)) | |
1286 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1287 | peer_delete(peer); | |
1288 | return -1; | |
1289 | } | |
f14e6fdb | 1290 | |
d62a17ae | 1291 | /* Clear start timer value to default. */ |
1292 | peer->v_start = BGP_INIT_START_TIMER; | |
397b5bde | 1293 | |
d62a17ae | 1294 | return (bgp_stop(peer)); |
397b5bde LR |
1295 | } |
1296 | ||
07a16526 QY |
1297 | /** |
1298 | * Determines whether a TCP session has successfully established for a peer and | |
1299 | * events as appropriate. | |
1300 | * | |
1301 | * This function is called when setting up a new session. After connect() is | |
387f984e QY |
1302 | * called on the peer's socket (in bgp_start()), the fd is passed to poll() |
1303 | * to wait for connection success or failure. When poll() returns, this | |
07a16526 | 1304 | * function is called to evaluate the result. |
387f984e QY |
1305 | * |
1306 | * Due to differences in behavior of poll() on Linux and BSD - specifically, | |
1307 | * the value of .revents in the case of a closed connection - this function is | |
1308 | * scheduled both for a read and a write event. The write event is triggered | |
1309 | * when the connection is established. A read event is triggered when the | |
1310 | * connection is closed. Thus we need to cancel whichever one did not occur. | |
07a16526 QY |
1311 | */ |
1312 | static int bgp_connect_check(struct thread *thread) | |
1313 | { | |
1314 | int status; | |
1315 | socklen_t slen; | |
1316 | int ret; | |
1317 | struct peer *peer; | |
1318 | ||
1319 | peer = THREAD_ARG(thread); | |
424ab01d QY |
1320 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); |
1321 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); | |
1322 | assert(!peer->t_read); | |
1323 | assert(!peer->t_write); | |
07a16526 | 1324 | |
387f984e QY |
1325 | THREAD_OFF(peer->t_connect_check_r); |
1326 | THREAD_OFF(peer->t_connect_check_w); | |
dc1188bb | 1327 | |
07a16526 QY |
1328 | /* Check file descriptor. */ |
1329 | slen = sizeof(status); | |
1330 | ret = getsockopt(peer->fd, SOL_SOCKET, SO_ERROR, (void *)&status, | |
1331 | &slen); | |
1332 | ||
1333 | /* If getsockopt is fail, this is fatal error. */ | |
1334 | if (ret < 0) { | |
4cb5e18b | 1335 | zlog_err("can't get sockopt for nonblocking connect: %d(%s)", |
54ff5e9b | 1336 | errno, safe_strerror(errno)); |
07a16526 QY |
1337 | BGP_EVENT_ADD(peer, TCP_fatal_error); |
1338 | return -1; | |
1339 | } | |
1340 | ||
1341 | /* When status is 0 then TCP connection is established. */ | |
1342 | if (status == 0) { | |
1343 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
1344 | return 1; | |
1345 | } else { | |
1346 | if (bgp_debug_neighbor_events(peer)) | |
54ff5e9b DS |
1347 | zlog_debug("%s [Event] Connect failed %d(%s)", |
1348 | peer->host, status, safe_strerror(status)); | |
07a16526 QY |
1349 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); |
1350 | return 0; | |
1351 | } | |
1352 | } | |
397b5bde | 1353 | |
718e3744 | 1354 | /* TCP connection open. Next we send open message to remote peer. And |
1355 | add read thread for reading open message. */ | |
d62a17ae | 1356 | static int bgp_connect_success(struct peer *peer) |
718e3744 | 1357 | { |
d62a17ae | 1358 | if (peer->fd < 0) { |
e50f7cfd | 1359 | flog_err(EC_BGP_CONNECT, |
1c50c1c0 QY |
1360 | "bgp_connect_success peer's fd is negative value %d", |
1361 | peer->fd); | |
d62a17ae | 1362 | bgp_stop(peer); |
1363 | return -1; | |
1364 | } | |
1365 | ||
1366 | if (bgp_getsockname(peer) < 0) { | |
450971aa | 1367 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 QY |
1368 | "%s: bgp_getsockname(): failed for peer %s, fd %d", |
1369 | __FUNCTION__, peer->host, peer->fd); | |
0e35025e DA |
1370 | bgp_notify_send( |
1371 | peer, BGP_NOTIFY_FSM_ERR, | |
1372 | BGP_NOTIFY_SUBCODE_UNSPECIFIC); /* internal error */ | |
424ab01d | 1373 | bgp_writes_on(peer); |
d62a17ae | 1374 | return -1; |
1375 | } | |
1376 | ||
424ab01d | 1377 | bgp_reads_on(peer); |
d62a17ae | 1378 | |
1379 | if (bgp_debug_neighbor_events(peer)) { | |
1380 | char buf1[SU_ADDRSTRLEN]; | |
1381 | ||
1382 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) | |
1383 | zlog_debug("%s open active, local address %s", | |
1384 | peer->host, | |
1385 | sockunion2str(peer->su_local, buf1, | |
1386 | SU_ADDRSTRLEN)); | |
1387 | else | |
1388 | zlog_debug("%s passive open", peer->host); | |
1389 | } | |
1390 | ||
1391 | bgp_open_send(peer); | |
1392 | ||
1393 | return 0; | |
718e3744 | 1394 | } |
1395 | ||
1396 | /* TCP connect fail */ | |
d62a17ae | 1397 | static int bgp_connect_fail(struct peer *peer) |
718e3744 | 1398 | { |
d62a17ae | 1399 | if (peer_dynamic_neighbor(peer)) { |
1400 | if (bgp_debug_neighbor_events(peer)) | |
1401 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1402 | peer_delete(peer); | |
1403 | return -1; | |
1404 | } | |
1405 | ||
1406 | return (bgp_stop(peer)); | |
718e3744 | 1407 | } |
1408 | ||
1409 | /* This function is the first starting point of all BGP connection. It | |
1410 | try to connect to remote peer with non-blocking IO. */ | |
d62a17ae | 1411 | int bgp_start(struct peer *peer) |
718e3744 | 1412 | { |
d62a17ae | 1413 | int status; |
d62a17ae | 1414 | |
1415 | bgp_peer_conf_if_to_su_update(peer); | |
1416 | ||
1417 | if (peer->su.sa.sa_family == AF_UNSPEC) { | |
1418 | if (bgp_debug_neighbor_events(peer)) | |
1419 | zlog_debug( | |
1420 | "%s [FSM] Unable to get neighbor's IP address, waiting...", | |
1421 | peer->host); | |
3577f1c5 | 1422 | peer->last_reset = PEER_DOWN_NBR_ADDR; |
d62a17ae | 1423 | return -1; |
1424 | } | |
1425 | ||
1426 | if (BGP_PEER_START_SUPPRESSED(peer)) { | |
1427 | if (bgp_debug_neighbor_events(peer)) | |
e50f7cfd | 1428 | flog_err(EC_BGP_FSM, |
1c50c1c0 QY |
1429 | "%s [FSM] Trying to start suppressed peer" |
1430 | " - this is never supposed to happen!", | |
1431 | peer->host); | |
d62a17ae | 1432 | return -1; |
1433 | } | |
1434 | ||
1435 | /* Scrub some information that might be left over from a previous, | |
1436 | * session | |
1437 | */ | |
1438 | /* Connection information. */ | |
1439 | if (peer->su_local) { | |
1440 | sockunion_free(peer->su_local); | |
1441 | peer->su_local = NULL; | |
1442 | } | |
1443 | ||
1444 | if (peer->su_remote) { | |
1445 | sockunion_free(peer->su_remote); | |
1446 | peer->su_remote = NULL; | |
1447 | } | |
1448 | ||
1449 | /* Clear remote router-id. */ | |
1450 | peer->remote_id.s_addr = 0; | |
1451 | ||
1452 | /* Clear peer capability flag. */ | |
1453 | peer->cap = 0; | |
1454 | ||
1455 | /* If the peer is passive mode, force to move to Active mode. */ | |
1456 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE)) { | |
1457 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1458 | return 0; | |
1459 | } | |
1460 | ||
dded74d5 DS |
1461 | if (peer->bgp->inst_type != BGP_INSTANCE_TYPE_VIEW && |
1462 | peer->bgp->vrf_id == VRF_UNKNOWN) { | |
61cf4b37 | 1463 | if (bgp_debug_neighbor_events(peer)) |
af4c2728 | 1464 | flog_err( |
e50f7cfd | 1465 | EC_BGP_FSM, |
996c9314 LB |
1466 | "%s [FSM] In a VRF that is not initialised yet", |
1467 | peer->host); | |
3577f1c5 | 1468 | peer->last_reset = PEER_DOWN_VRF_UNINIT; |
61cf4b37 PG |
1469 | return -1; |
1470 | } | |
1471 | ||
e2d3a909 | 1472 | /* Register peer for NHT. If next hop is already resolved, proceed |
1473 | * with connection setup, else wait. | |
1474 | */ | |
1475 | if (!bgp_peer_reg_with_nht(peer)) { | |
c42eab4b DS |
1476 | if (bgp_zebra_num_connects()) { |
1477 | if (bgp_debug_neighbor_events(peer)) | |
1478 | zlog_debug("%s [FSM] Waiting for NHT", | |
1479 | peer->host); | |
3577f1c5 | 1480 | peer->last_reset = PEER_DOWN_WAITING_NHT; |
c42eab4b DS |
1481 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); |
1482 | return 0; | |
1483 | } | |
718e3744 | 1484 | } |
d62a17ae | 1485 | |
424ab01d QY |
1486 | assert(!peer->t_write); |
1487 | assert(!peer->t_read); | |
1488 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); | |
1489 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); | |
d62a17ae | 1490 | status = bgp_connect(peer); |
1491 | ||
1492 | switch (status) { | |
1493 | case connect_error: | |
1494 | if (bgp_debug_neighbor_events(peer)) | |
1495 | zlog_debug("%s [FSM] Connect error", peer->host); | |
1496 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1497 | break; | |
1498 | case connect_success: | |
1499 | if (bgp_debug_neighbor_events(peer)) | |
1500 | zlog_debug( | |
1501 | "%s [FSM] Connect immediately success, fd %d", | |
1502 | peer->host, peer->fd); | |
1503 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
1504 | break; | |
1505 | case connect_in_progress: | |
1506 | /* To check nonblocking connect, we wait until socket is | |
1507 | readable or writable. */ | |
1508 | if (bgp_debug_neighbor_events(peer)) | |
1509 | zlog_debug( | |
1510 | "%s [FSM] Non blocking connect waiting result, fd %d", | |
1511 | peer->host, peer->fd); | |
1512 | if (peer->fd < 0) { | |
e50f7cfd | 1513 | flog_err(EC_BGP_FSM, |
1c50c1c0 QY |
1514 | "bgp_start peer's fd is negative value %d", |
1515 | peer->fd); | |
d62a17ae | 1516 | return -1; |
1517 | } | |
becedef6 | 1518 | /* |
387f984e QY |
1519 | * - when the socket becomes ready, poll() will signify POLLOUT |
1520 | * - if it fails to connect, poll() will signify POLLHUP | |
1521 | * - POLLHUP is handled as a 'read' event by thread.c | |
1522 | * | |
1523 | * therefore, we schedule both a read and a write event with | |
1524 | * bgp_connect_check() as the handler for each and cancel the | |
1525 | * unused event in that function. | |
becedef6 | 1526 | */ |
424ab01d | 1527 | thread_add_read(bm->master, bgp_connect_check, peer, peer->fd, |
387f984e QY |
1528 | &peer->t_connect_check_r); |
1529 | thread_add_write(bm->master, bgp_connect_check, peer, peer->fd, | |
1530 | &peer->t_connect_check_w); | |
d62a17ae | 1531 | break; |
1532 | } | |
1533 | return 0; | |
718e3744 | 1534 | } |
1535 | ||
1536 | /* Connect retry timer is expired when the peer status is Connect. */ | |
d62a17ae | 1537 | static int bgp_reconnect(struct peer *peer) |
718e3744 | 1538 | { |
d62a17ae | 1539 | if (bgp_stop(peer) < 0) |
1540 | return -1; | |
1ff9a340 | 1541 | |
d62a17ae | 1542 | bgp_start(peer); |
1543 | return 0; | |
718e3744 | 1544 | } |
1545 | ||
d62a17ae | 1546 | static int bgp_fsm_open(struct peer *peer) |
718e3744 | 1547 | { |
d62a17ae | 1548 | /* Send keepalive and make keepalive timer */ |
1549 | bgp_keepalive_send(peer); | |
718e3744 | 1550 | |
d62a17ae | 1551 | /* Reset holdtimer value. */ |
1552 | BGP_TIMER_OFF(peer->t_holdtime); | |
718e3744 | 1553 | |
d62a17ae | 1554 | return 0; |
718e3744 | 1555 | } |
1556 | ||
397b5bde LR |
1557 | /* FSM error, unexpected event. This is error of BGP connection. So cut the |
1558 | peer and change to Idle status. */ | |
d62a17ae | 1559 | static int bgp_fsm_event_error(struct peer *peer) |
397b5bde | 1560 | { |
1c50c1c0 QY |
1561 | flog_err(EC_BGP_FSM, "%s [FSM] unexpected packet received in state %s", |
1562 | peer->host, lookup_msg(bgp_status_msg, peer->status, NULL)); | |
397b5bde | 1563 | |
d62a17ae | 1564 | return bgp_stop_with_notify(peer, BGP_NOTIFY_FSM_ERR, 0); |
397b5bde LR |
1565 | } |
1566 | ||
718e3744 | 1567 | /* Hold timer expire. This is error of BGP connection. So cut the |
1568 | peer and change to Idle status. */ | |
d62a17ae | 1569 | static int bgp_fsm_holdtime_expire(struct peer *peer) |
718e3744 | 1570 | { |
d62a17ae | 1571 | if (bgp_debug_neighbor_events(peer)) |
1572 | zlog_debug("%s [FSM] Hold timer expire", peer->host); | |
718e3744 | 1573 | |
d62a17ae | 1574 | return bgp_stop_with_notify(peer, BGP_NOTIFY_HOLD_ERR, 0); |
718e3744 | 1575 | } |
1576 | ||
727c4f87 QY |
1577 | /** |
1578 | * Transition to Established state. | |
1579 | * | |
1580 | * Convert peer from stub to full fledged peer, set some timers, and generate | |
1581 | * initial updates. | |
1582 | */ | |
d62a17ae | 1583 | static int bgp_establish(struct peer *peer) |
718e3744 | 1584 | { |
d62a17ae | 1585 | afi_t afi; |
1586 | safi_t safi; | |
1587 | int nsf_af_count = 0; | |
1588 | int ret = 0; | |
1589 | struct peer *other; | |
1590 | ||
1591 | other = peer->doppelganger; | |
1592 | peer = peer_xfer_conn(peer); | |
1593 | if (!peer) { | |
e50f7cfd | 1594 | flog_err(EC_BGP_CONNECT, "%%Neighbor failed in xfer_conn"); |
d62a17ae | 1595 | return -1; |
93406d87 | 1596 | } |
93406d87 | 1597 | |
d62a17ae | 1598 | if (other == peer) |
996c9314 LB |
1599 | ret = 1; /* bgp_establish specific code when xfer_conn |
1600 | happens. */ | |
d62a17ae | 1601 | |
1602 | /* Reset capability open status flag. */ | |
1603 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN)) | |
1604 | SET_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN); | |
1605 | ||
1606 | /* Clear start timer value to default. */ | |
1607 | peer->v_start = BGP_INIT_START_TIMER; | |
1608 | ||
1609 | /* Increment established count. */ | |
1610 | peer->established++; | |
1611 | bgp_fsm_change_status(peer, Established); | |
1612 | ||
1613 | /* bgp log-neighbor-changes of neighbor Up */ | |
1614 | if (bgp_flag_check(peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { | |
1615 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); | |
1616 | zlog_info("%%ADJCHANGE: neighbor %s(%s) in vrf %s Up", | |
1617 | peer->host, | |
1618 | (peer->hostname) ? peer->hostname : "Unknown", | |
5742e42b DS |
1619 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) |
1620 | ? vrf->name | |
1621 | : VRF_DEFAULT_NAME) | |
d62a17ae | 1622 | : ""); |
1623 | } | |
1624 | /* assign update-group/subgroup */ | |
1625 | update_group_adjust_peer_afs(peer); | |
1626 | ||
1627 | /* graceful restart */ | |
1628 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
1629 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 1630 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) { |
d62a17ae | 1631 | if (peer->afc_nego[afi][safi] |
1632 | && CHECK_FLAG(peer->cap, PEER_CAP_RESTART_ADV) | |
1633 | && CHECK_FLAG(peer->af_cap[afi][safi], | |
1634 | PEER_CAP_RESTART_AF_RCV)) { | |
1635 | if (peer->nsf[afi][safi] | |
1636 | && !CHECK_FLAG( | |
1637 | peer->af_cap[afi][safi], | |
1638 | PEER_CAP_RESTART_AF_PRESERVE_RCV)) | |
1639 | bgp_clear_stale_route(peer, afi, safi); | |
1640 | ||
1641 | peer->nsf[afi][safi] = 1; | |
1642 | nsf_af_count++; | |
1643 | } else { | |
1644 | if (peer->nsf[afi][safi]) | |
1645 | bgp_clear_stale_route(peer, afi, safi); | |
1646 | peer->nsf[afi][safi] = 0; | |
1647 | } | |
1648 | } | |
1649 | ||
1650 | if (nsf_af_count) | |
1651 | SET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1652 | else { | |
1653 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1654 | if (peer->t_gr_stale) { | |
1655 | BGP_TIMER_OFF(peer->t_gr_stale); | |
1656 | if (bgp_debug_neighbor_events(peer)) | |
1657 | zlog_debug( | |
1658 | "%s graceful restart stalepath timer stopped", | |
1659 | peer->host); | |
1660 | } | |
1661 | } | |
93406d87 | 1662 | |
d62a17ae | 1663 | if (peer->t_gr_restart) { |
1664 | BGP_TIMER_OFF(peer->t_gr_restart); | |
1665 | if (bgp_debug_neighbor_events(peer)) | |
1666 | zlog_debug("%s graceful restart timer stopped", | |
1667 | peer->host); | |
1668 | } | |
718e3744 | 1669 | |
9eb217ff QY |
1670 | /* Reset uptime, turn on keepalives, send current table. */ |
1671 | if (!peer->v_holdtime) | |
1672 | bgp_keepalives_on(peer); | |
1673 | ||
d62a17ae | 1674 | peer->uptime = bgp_clock(); |
1675 | ||
1676 | /* Send route-refresh when ORF is enabled */ | |
05c7a1cc QY |
1677 | FOREACH_AFI_SAFI (afi, safi) { |
1678 | if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1679 | PEER_CAP_ORF_PREFIX_SM_ADV)) { | |
d62a17ae | 1680 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc QY |
1681 | PEER_CAP_ORF_PREFIX_RM_RCV)) |
1682 | bgp_route_refresh_send(peer, afi, safi, | |
1683 | ORF_TYPE_PREFIX, | |
1684 | REFRESH_IMMEDIATE, 0); | |
1685 | else if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1686 | PEER_CAP_ORF_PREFIX_RM_OLD_RCV)) | |
1687 | bgp_route_refresh_send(peer, afi, safi, | |
1688 | ORF_TYPE_PREFIX_OLD, | |
1689 | REFRESH_IMMEDIATE, 0); | |
1690 | } | |
1691 | } | |
d62a17ae | 1692 | |
1693 | /* First update is deferred until ORF or ROUTE-REFRESH is received */ | |
05c7a1cc QY |
1694 | FOREACH_AFI_SAFI (afi, safi) { |
1695 | if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1696 | PEER_CAP_ORF_PREFIX_RM_ADV)) | |
d62a17ae | 1697 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc QY |
1698 | PEER_CAP_ORF_PREFIX_SM_RCV) |
1699 | || CHECK_FLAG(peer->af_cap[afi][safi], | |
1700 | PEER_CAP_ORF_PREFIX_SM_OLD_RCV)) | |
1701 | SET_FLAG(peer->af_sflags[afi][safi], | |
1702 | PEER_STATUS_ORF_WAIT_REFRESH); | |
1703 | } | |
d62a17ae | 1704 | |
1705 | bgp_announce_peer(peer); | |
1706 | ||
1707 | /* Start the route advertisement timer to send updates to the peer - if | |
1708 | * BGP | |
1709 | * is not in read-only mode. If it is, the timer will be started at the | |
1710 | * end | |
1711 | * of read-only mode. | |
1712 | */ | |
1713 | if (!bgp_update_delay_active(peer->bgp)) { | |
1714 | BGP_TIMER_OFF(peer->t_routeadv); | |
1715 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
1716 | } | |
718e3744 | 1717 | |
d62a17ae | 1718 | if (peer->doppelganger && (peer->doppelganger->status != Deleted)) { |
1719 | if (bgp_debug_neighbor_events(peer)) | |
1720 | zlog_debug( | |
1721 | "[Event] Deleting stub connection for peer %s", | |
1722 | peer->host); | |
1723 | ||
1724 | if (peer->doppelganger->status > Active) | |
1725 | bgp_notify_send(peer->doppelganger, BGP_NOTIFY_CEASE, | |
1726 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
1727 | else | |
1728 | peer_delete(peer->doppelganger); | |
718e3744 | 1729 | } |
1730 | ||
19bd3dff DS |
1731 | /* |
1732 | * If we are replacing the old peer for a doppelganger | |
1733 | * then switch it around in the bgp->peerhash | |
1734 | * the doppelgangers su and this peer's su are the same | |
1735 | * so the hash_release is the same for either. | |
1736 | */ | |
1737 | hash_release(peer->bgp->peerhash, peer); | |
1738 | hash_get(peer->bgp->peerhash, peer, hash_alloc_intern); | |
1739 | ||
d62a17ae | 1740 | bgp_bfd_register_peer(peer); |
1741 | return ret; | |
718e3744 | 1742 | } |
1743 | ||
1744 | /* Keepalive packet is received. */ | |
d62a17ae | 1745 | static int bgp_fsm_keepalive(struct peer *peer) |
718e3744 | 1746 | { |
d62a17ae | 1747 | BGP_TIMER_OFF(peer->t_holdtime); |
1748 | return 0; | |
718e3744 | 1749 | } |
1750 | ||
1751 | /* Update packet is received. */ | |
d62a17ae | 1752 | static int bgp_fsm_update(struct peer *peer) |
718e3744 | 1753 | { |
d62a17ae | 1754 | BGP_TIMER_OFF(peer->t_holdtime); |
1755 | return 0; | |
718e3744 | 1756 | } |
1757 | ||
1758 | /* This is empty event. */ | |
d62a17ae | 1759 | static int bgp_ignore(struct peer *peer) |
718e3744 | 1760 | { |
af4c2728 | 1761 | flog_err( |
e50f7cfd | 1762 | EC_BGP_FSM, |
d62a17ae | 1763 | "%s [FSM] Ignoring event %s in state %s, prior events %s, %s, fd %d", |
1764 | peer->host, bgp_event_str[peer->cur_event], | |
1765 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1766 | bgp_event_str[peer->last_event], | |
1767 | bgp_event_str[peer->last_major_event], peer->fd); | |
1768 | return 0; | |
718e3744 | 1769 | } |
6b0655a2 | 1770 | |
6403814c | 1771 | /* This is to handle unexpected events.. */ |
d62a17ae | 1772 | static int bgp_fsm_exeption(struct peer *peer) |
6403814c | 1773 | { |
af4c2728 | 1774 | flog_err( |
e50f7cfd | 1775 | EC_BGP_FSM, |
d62a17ae | 1776 | "%s [FSM] Unexpected event %s in state %s, prior events %s, %s, fd %d", |
1777 | peer->host, bgp_event_str[peer->cur_event], | |
1778 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1779 | bgp_event_str[peer->last_event], | |
1780 | bgp_event_str[peer->last_major_event], peer->fd); | |
1781 | return (bgp_stop(peer)); | |
6403814c DS |
1782 | } |
1783 | ||
fc04a677 | 1784 | void bgp_fsm_event_update(struct peer *peer, int valid) |
fc9a856f | 1785 | { |
d62a17ae | 1786 | if (!peer) |
1787 | return; | |
1788 | ||
1789 | switch (peer->status) { | |
1790 | case Idle: | |
1791 | if (valid) | |
1792 | BGP_EVENT_ADD(peer, BGP_Start); | |
1793 | break; | |
1794 | case Connect: | |
1795 | if (!valid) { | |
1796 | BGP_TIMER_OFF(peer->t_connect); | |
1797 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
1798 | } | |
1799 | break; | |
1800 | case Active: | |
1801 | if (valid) { | |
1802 | BGP_TIMER_OFF(peer->t_connect); | |
1803 | BGP_EVENT_ADD(peer, ConnectRetry_timer_expired); | |
1804 | } | |
1805 | break; | |
1806 | case OpenSent: | |
1807 | case OpenConfirm: | |
1808 | case Established: | |
1809 | if (!valid && (peer->gtsm_hops == 1)) | |
1810 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
1811 | case Clearing: | |
1812 | case Deleted: | |
1813 | default: | |
1814 | break; | |
fc9a856f | 1815 | } |
fc9a856f DS |
1816 | } |
1817 | ||
718e3744 | 1818 | /* Finite State Machine structure */ |
fda1d3e0 | 1819 | static const struct { |
d62a17ae | 1820 | int (*func)(struct peer *); |
1821 | int next_state; | |
1822 | } FSM[BGP_STATUS_MAX - 1][BGP_EVENTS_MAX - 1] = { | |
1823 | { | |
1824 | /* Idle state: In Idle state, all events other than BGP_Start is | |
1825 | ignored. With BGP_Start event, finite state machine calls | |
1826 | bgp_start(). */ | |
1827 | {bgp_start, Connect}, /* BGP_Start */ | |
1828 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1829 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1830 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1831 | {bgp_ignore, Idle}, /* TCP_connection_open_failed */ | |
1832 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1833 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ | |
1834 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
1835 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
1836 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
1837 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
1838 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
1839 | {bgp_ignore, Idle}, /* Receive_NOTIFICATION_message */ | |
1840 | {bgp_ignore, Idle}, /* Clearing_Completed */ | |
1841 | }, | |
1842 | { | |
1843 | /* Connect */ | |
1844 | {bgp_ignore, Connect}, /* BGP_Start */ | |
1845 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1846 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1847 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1848 | {bgp_connect_fail, Active}, /* TCP_connection_open_failed */ | |
1849 | {bgp_connect_fail, Idle}, /* TCP_fatal_error */ | |
1850 | {bgp_reconnect, Connect}, /* ConnectRetry_timer_expired */ | |
1851 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ | |
1852 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1853 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1854 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
1855 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1856 | {bgp_stop, Idle}, /* Receive_NOTIFICATION_message */ | |
1857 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1858 | }, | |
1859 | { | |
1860 | /* Active, */ | |
1861 | {bgp_ignore, Active}, /* BGP_Start */ | |
1862 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1863 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
1864 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1865 | {bgp_ignore, Active}, /* TCP_connection_open_failed */ | |
1866 | {bgp_fsm_exeption, Idle}, /* TCP_fatal_error */ | |
1867 | {bgp_start, Connect}, /* ConnectRetry_timer_expired */ | |
1868 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ | |
1869 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1870 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1871 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
1872 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1873 | {bgp_fsm_exeption, Idle}, /* Receive_NOTIFICATION_message */ | |
1874 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1875 | }, | |
1876 | { | |
1877 | /* OpenSent, */ | |
1878 | {bgp_ignore, OpenSent}, /* BGP_Start */ | |
1879 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1880 | {bgp_stop, Active}, /* TCP_connection_open */ | |
1881 | {bgp_stop, Active}, /* TCP_connection_closed */ | |
1882 | {bgp_stop, Active}, /* TCP_connection_open_failed */ | |
1883 | {bgp_stop, Active}, /* TCP_fatal_error */ | |
1884 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ | |
1885 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
1886 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
1887 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ | |
1888 | {bgp_fsm_event_error, Idle}, /* Receive_KEEPALIVE_message */ | |
1889 | {bgp_fsm_event_error, Idle}, /* Receive_UPDATE_message */ | |
53b4aaec | 1890 | {bgp_fsm_event_error, Idle}, /* Receive_NOTIFICATION_message */ |
d62a17ae | 1891 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ |
1892 | }, | |
1893 | { | |
1894 | /* OpenConfirm, */ | |
1895 | {bgp_ignore, OpenConfirm}, /* BGP_Start */ | |
1896 | {bgp_stop, Idle}, /* BGP_Stop */ | |
1897 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
1898 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
1899 | {bgp_stop, Idle}, /* TCP_connection_open_failed */ | |
1900 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
1901 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ | |
1902 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
1903 | {bgp_ignore, OpenConfirm}, /* KeepAlive_timer_expired */ | |
1904 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
1905 | {bgp_establish, Established}, /* Receive_KEEPALIVE_message */ | |
1906 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
1907 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
1908 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1909 | }, | |
1910 | { | |
1911 | /* Established, */ | |
1912 | {bgp_ignore, Established}, /* BGP_Start */ | |
1913 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
1914 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1915 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
1916 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
1917 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
1918 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
1919 | {bgp_fsm_holdtime_expire, Clearing}, /* Hold_Timer_expired */ | |
03014d48 QY |
1920 | {bgp_ignore, Established}, /* KeepAlive_timer_expired */ |
1921 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
d62a17ae | 1922 | {bgp_fsm_keepalive, |
1923 | Established}, /* Receive_KEEPALIVE_message */ | |
1924 | {bgp_fsm_update, Established}, /* Receive_UPDATE_message */ | |
1925 | {bgp_stop_with_error, | |
1926 | Clearing}, /* Receive_NOTIFICATION_message */ | |
1927 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
1928 | }, | |
1929 | { | |
1930 | /* Clearing, */ | |
1931 | {bgp_ignore, Clearing}, /* BGP_Start */ | |
1932 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
1933 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
1934 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
1935 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
1936 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
1937 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
1938 | {bgp_stop, Clearing}, /* Hold_Timer_expired */ | |
1939 | {bgp_stop, Clearing}, /* KeepAlive_timer_expired */ | |
1940 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
1941 | {bgp_stop, Clearing}, /* Receive_KEEPALIVE_message */ | |
1942 | {bgp_stop, Clearing}, /* Receive_UPDATE_message */ | |
1943 | {bgp_stop, Clearing}, /* Receive_NOTIFICATION_message */ | |
1944 | {bgp_clearing_completed, Idle}, /* Clearing_Completed */ | |
1945 | }, | |
1946 | { | |
1947 | /* Deleted, */ | |
1948 | {bgp_ignore, Deleted}, /* BGP_Start */ | |
1949 | {bgp_ignore, Deleted}, /* BGP_Stop */ | |
1950 | {bgp_ignore, Deleted}, /* TCP_connection_open */ | |
1951 | {bgp_ignore, Deleted}, /* TCP_connection_closed */ | |
1952 | {bgp_ignore, Deleted}, /* TCP_connection_open_failed */ | |
1953 | {bgp_ignore, Deleted}, /* TCP_fatal_error */ | |
1954 | {bgp_ignore, Deleted}, /* ConnectRetry_timer_expired */ | |
1955 | {bgp_ignore, Deleted}, /* Hold_Timer_expired */ | |
1956 | {bgp_ignore, Deleted}, /* KeepAlive_timer_expired */ | |
1957 | {bgp_ignore, Deleted}, /* Receive_OPEN_message */ | |
1958 | {bgp_ignore, Deleted}, /* Receive_KEEPALIVE_message */ | |
1959 | {bgp_ignore, Deleted}, /* Receive_UPDATE_message */ | |
1960 | {bgp_ignore, Deleted}, /* Receive_NOTIFICATION_message */ | |
1961 | {bgp_ignore, Deleted}, /* Clearing_Completed */ | |
1962 | }, | |
718e3744 | 1963 | }; |
1964 | ||
718e3744 | 1965 | /* Execute event process. */ |
d62a17ae | 1966 | int bgp_event(struct thread *thread) |
718e3744 | 1967 | { |
d62a17ae | 1968 | int event; |
1969 | struct peer *peer; | |
1970 | int ret; | |
718e3744 | 1971 | |
d62a17ae | 1972 | peer = THREAD_ARG(thread); |
1973 | event = THREAD_VAL(thread); | |
718e3744 | 1974 | |
d62a17ae | 1975 | ret = bgp_event_update(peer, event); |
1ff9a340 | 1976 | |
d62a17ae | 1977 | return (ret); |
1ff9a340 DS |
1978 | } |
1979 | ||
d62a17ae | 1980 | int bgp_event_update(struct peer *peer, int event) |
1ff9a340 | 1981 | { |
d62a17ae | 1982 | int next; |
1983 | int ret = 0; | |
1984 | struct peer *other; | |
1985 | int passive_conn = 0; | |
1986 | int dyn_nbr; | |
1987 | ||
d8151687 QY |
1988 | /* default return code */ |
1989 | ret = FSM_PEER_NOOP; | |
1990 | ||
d62a17ae | 1991 | other = peer->doppelganger; |
1992 | passive_conn = | |
1993 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) ? 1 : 0; | |
1994 | dyn_nbr = peer_dynamic_neighbor(peer); | |
1995 | ||
1996 | /* Logging this event. */ | |
1997 | next = FSM[peer->status - 1][event - 1].next_state; | |
1998 | ||
1999 | if (bgp_debug_neighbor_events(peer) && peer->status != next) | |
2000 | zlog_debug("%s [FSM] %s (%s->%s), fd %d", peer->host, | |
2001 | bgp_event_str[event], | |
2002 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
2003 | lookup_msg(bgp_status_msg, next, NULL), peer->fd); | |
2004 | ||
2005 | peer->last_event = peer->cur_event; | |
2006 | peer->cur_event = event; | |
2007 | ||
2008 | /* Call function. */ | |
2009 | if (FSM[peer->status - 1][event - 1].func) | |
2010 | ret = (*(FSM[peer->status - 1][event - 1].func))(peer); | |
2011 | ||
d62a17ae | 2012 | if (ret >= 0) { |
2013 | if (ret == 1 && next == Established) { | |
2014 | /* The case when doppelganger swap accurred in | |
2015 | bgp_establish. | |
2016 | Update the peer pointer accordingly */ | |
d8151687 | 2017 | ret = FSM_PEER_TRANSFERRED; |
d62a17ae | 2018 | peer = other; |
2019 | } | |
2020 | ||
2021 | /* If status is changed. */ | |
d8151687 | 2022 | if (next != peer->status) { |
d62a17ae | 2023 | bgp_fsm_change_status(peer, next); |
2024 | ||
becedef6 QY |
2025 | /* |
2026 | * If we're going to ESTABLISHED then we executed a | |
2027 | * peer transfer. In this case we can either return | |
2028 | * FSM_PEER_TRANSITIONED or FSM_PEER_TRANSFERRED. | |
2029 | * Opting for TRANSFERRED since transfer implies | |
2030 | * session establishment. | |
2031 | */ | |
d8151687 QY |
2032 | if (ret != FSM_PEER_TRANSFERRED) |
2033 | ret = FSM_PEER_TRANSITIONED; | |
2034 | } | |
2035 | ||
d62a17ae | 2036 | /* Make sure timer is set. */ |
2037 | bgp_timer_set(peer); | |
2038 | ||
bea01226 | 2039 | } else { |
becedef6 QY |
2040 | /* |
2041 | * If we got a return value of -1, that means there was an | |
2042 | * error, restart the FSM. Since bgp_stop() was called on the | |
2043 | * peer. only a few fields are safe to access here. In any case | |
2044 | * we need to indicate that the peer was stopped in the return | |
2045 | * code. | |
2046 | */ | |
bea01226 | 2047 | if (!dyn_nbr && !passive_conn && peer->bgp) { |
af4c2728 | 2048 | flog_err( |
e50f7cfd | 2049 | EC_BGP_FSM, |
bea01226 QY |
2050 | "%s [FSM] Failure handling event %s in state %s, " |
2051 | "prior events %s, %s, fd %d", | |
2052 | peer->host, bgp_event_str[peer->cur_event], | |
2053 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
2054 | bgp_event_str[peer->last_event], | |
2055 | bgp_event_str[peer->last_major_event], | |
2056 | peer->fd); | |
2057 | bgp_stop(peer); | |
2058 | bgp_fsm_change_status(peer, Idle); | |
2059 | bgp_timer_set(peer); | |
2060 | } | |
2061 | ret = FSM_PEER_STOPPED; | |
d62a17ae | 2062 | } |
bea01226 | 2063 | |
d62a17ae | 2064 | return ret; |
718e3744 | 2065 | } |