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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" |
8c48b3b6 | 38 | #include "zclient.h" |
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" |
1479ed2f | 51 | #include "bgpd/bgp_community.h" |
3f9c7369 | 52 | #include "bgpd/bgp_updgrp.h" |
ffd0c037 | 53 | #include "bgpd/bgp_nht.h" |
c43ed2e4 | 54 | #include "bgpd/bgp_bfd.h" |
4a1ab8e4 | 55 | #include "bgpd/bgp_memory.h" |
03014d48 | 56 | #include "bgpd/bgp_keepalives.h" |
56257a44 | 57 | #include "bgpd/bgp_io.h" |
c42eab4b | 58 | #include "bgpd/bgp_zebra.h" |
3742de8d | 59 | #include "bgpd/bgp_vty.h" |
6b0655a2 | 60 | |
8451921b DL |
61 | DEFINE_HOOK(peer_backward_transition, (struct peer * peer), (peer)); |
62 | DEFINE_HOOK(peer_status_changed, (struct peer * peer), (peer)); | |
3742de8d | 63 | |
6403814c DS |
64 | /* Definition of display strings corresponding to FSM events. This should be |
65 | * kept consistent with the events defined in bgpd.h | |
66 | */ | |
2b64873d | 67 | static const char *const bgp_event_str[] = { |
d62a17ae | 68 | NULL, |
69 | "BGP_Start", | |
70 | "BGP_Stop", | |
71 | "TCP_connection_open", | |
6c537a18 | 72 | "TCP_connection_open_w_delay", |
d62a17ae | 73 | "TCP_connection_closed", |
74 | "TCP_connection_open_failed", | |
75 | "TCP_fatal_error", | |
76 | "ConnectRetry_timer_expired", | |
77 | "Hold_Timer_expired", | |
78 | "KeepAlive_timer_expired", | |
6c537a18 | 79 | "DelayOpen_timer_expired", |
d62a17ae | 80 | "Receive_OPEN_message", |
81 | "Receive_KEEPALIVE_message", | |
82 | "Receive_UPDATE_message", | |
83 | "Receive_NOTIFICATION_message", | |
84 | "Clearing_Completed", | |
6403814c DS |
85 | }; |
86 | ||
718e3744 | 87 | /* BGP FSM (finite state machine) has three types of functions. Type |
88 | one is thread functions. Type two is event functions. Type three | |
89 | is FSM functions. Timer functions are set by bgp_timer_set | |
90 | function. */ | |
91 | ||
92 | /* BGP event function. */ | |
cc9f21da | 93 | void bgp_event(struct thread *); |
718e3744 | 94 | |
95 | /* BGP thread functions. */ | |
cc9f21da DS |
96 | static void bgp_start_timer(struct thread *); |
97 | static void bgp_connect_timer(struct thread *); | |
98 | static void bgp_holdtime_timer(struct thread *); | |
99 | static void bgp_delayopen_timer(struct thread *); | |
718e3744 | 100 | |
101 | /* BGP FSM functions. */ | |
d62a17ae | 102 | static int bgp_start(struct peer *); |
718e3744 | 103 | |
e2d3a909 | 104 | /* Register peer with NHT */ |
996319e6 | 105 | int bgp_peer_reg_with_nht(struct peer *peer) |
e2d3a909 | 106 | { |
107 | int connected = 0; | |
108 | ||
c8d6f0d6 | 109 | if (peer->sort == BGP_PEER_EBGP && peer->ttl == BGP_DEFAULT_TTL |
e2d3a909 | 110 | && !CHECK_FLAG(peer->flags, PEER_FLAG_DISABLE_CONNECTED_CHECK) |
892fedb6 | 111 | && !CHECK_FLAG(peer->bgp->flags, BGP_FLAG_DISABLE_NH_CONNECTED_CHK)) |
e2d3a909 | 112 | connected = 1; |
113 | ||
654a5978 PG |
114 | return bgp_find_or_add_nexthop( |
115 | peer->bgp, peer->bgp, family2afi(peer->su.sa.sa_family), | |
116 | SAFI_UNICAST, NULL, peer, connected, NULL); | |
e2d3a909 | 117 | } |
118 | ||
d62a17ae | 119 | static void peer_xfer_stats(struct peer *peer_dst, struct peer *peer_src) |
1ff9a340 | 120 | { |
d62a17ae | 121 | /* Copy stats over. These are only the pre-established state stats */ |
122 | peer_dst->open_in += peer_src->open_in; | |
123 | peer_dst->open_out += peer_src->open_out; | |
124 | peer_dst->keepalive_in += peer_src->keepalive_in; | |
125 | peer_dst->keepalive_out += peer_src->keepalive_out; | |
126 | peer_dst->notify_in += peer_src->notify_in; | |
127 | peer_dst->notify_out += peer_src->notify_out; | |
128 | peer_dst->dynamic_cap_in += peer_src->dynamic_cap_in; | |
129 | peer_dst->dynamic_cap_out += peer_src->dynamic_cap_out; | |
1ff9a340 DS |
130 | } |
131 | ||
d62a17ae | 132 | static struct peer *peer_xfer_conn(struct peer *from_peer) |
1ff9a340 | 133 | { |
d62a17ae | 134 | struct peer *peer; |
135 | afi_t afi; | |
136 | safi_t safi; | |
137 | int fd; | |
8398b5d5 | 138 | enum bgp_fsm_status status, pstatus; |
d1060698 | 139 | enum bgp_fsm_events last_evt, last_maj_evt; |
d62a17ae | 140 | |
141 | assert(from_peer != NULL); | |
142 | ||
143 | peer = from_peer->doppelganger; | |
144 | ||
145 | if (!peer || !CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE)) | |
146 | return from_peer; | |
147 | ||
9bf904cc DS |
148 | /* |
149 | * Let's check that we are not going to loose known configuration | |
150 | * state based upon doppelganger rules. | |
151 | */ | |
152 | FOREACH_AFI_SAFI (afi, safi) { | |
153 | if (from_peer->afc[afi][safi] != peer->afc[afi][safi]) { | |
154 | flog_err( | |
155 | EC_BGP_DOPPELGANGER_CONFIG, | |
156 | "from_peer->afc[%d][%d] is not the same as what we are overwriting", | |
157 | afi, safi); | |
158 | return NULL; | |
159 | } | |
160 | } | |
161 | ||
d62a17ae | 162 | if (bgp_debug_neighbor_events(peer)) |
163 | zlog_debug("%s: peer transfer %p fd %d -> %p fd %d)", | |
164 | from_peer->host, from_peer, from_peer->fd, peer, | |
165 | peer->fd); | |
166 | ||
424ab01d QY |
167 | bgp_writes_off(peer); |
168 | bgp_reads_off(peer); | |
169 | bgp_writes_off(from_peer); | |
170 | bgp_reads_off(from_peer); | |
d62a17ae | 171 | |
74e00a55 S |
172 | /* |
173 | * Before exchanging FD remove doppelganger from | |
174 | * keepalive peer hash. It could be possible conf peer | |
175 | * fd is set to -1. If blocked on lock then keepalive | |
176 | * thread can access peer pointer with fd -1. | |
177 | */ | |
178 | bgp_keepalives_off(from_peer); | |
179 | ||
d62a17ae | 180 | BGP_TIMER_OFF(peer->t_routeadv); |
424ab01d | 181 | BGP_TIMER_OFF(peer->t_connect); |
6c537a18 | 182 | BGP_TIMER_OFF(peer->t_delayopen); |
387f984e QY |
183 | BGP_TIMER_OFF(peer->t_connect_check_r); |
184 | BGP_TIMER_OFF(peer->t_connect_check_w); | |
d62a17ae | 185 | BGP_TIMER_OFF(from_peer->t_routeadv); |
424ab01d | 186 | BGP_TIMER_OFF(from_peer->t_connect); |
6c537a18 | 187 | BGP_TIMER_OFF(from_peer->t_delayopen); |
387f984e QY |
188 | BGP_TIMER_OFF(from_peer->t_connect_check_r); |
189 | BGP_TIMER_OFF(from_peer->t_connect_check_w); | |
7a86aa5a | 190 | BGP_TIMER_OFF(from_peer->t_process_packet); |
d3ecc69e | 191 | |
becedef6 QY |
192 | /* |
193 | * At this point in time, it is possible that there are packets pending | |
194 | * on various buffers. Those need to be transferred or dropped, | |
195 | * otherwise we'll get spurious failures during session establishment. | |
196 | */ | |
00dffa8c | 197 | frr_with_mutex(&peer->io_mtx, &from_peer->io_mtx) { |
424ab01d QY |
198 | fd = peer->fd; |
199 | peer->fd = from_peer->fd; | |
200 | from_peer->fd = fd; | |
201 | ||
202 | stream_fifo_clean(peer->ibuf); | |
d3ecc69e | 203 | stream_fifo_clean(peer->obuf); |
d3ecc69e | 204 | |
becedef6 QY |
205 | /* |
206 | * this should never happen, since bgp_process_packet() is the | |
207 | * only task that sets and unsets the current packet and it | |
208 | * runs in our pthread. | |
209 | */ | |
424ab01d | 210 | if (peer->curr) { |
af4c2728 | 211 | flog_err( |
e50f7cfd | 212 | EC_BGP_PKT_PROCESS, |
424ab01d QY |
213 | "[%s] Dropping pending packet on connection transfer:", |
214 | peer->host); | |
584470fb DL |
215 | /* there used to be a bgp_packet_dump call here, but |
216 | * that's extremely confusing since there's no way to | |
217 | * identify the packet in MRT dumps or BMP as dropped | |
218 | * due to connection transfer. | |
219 | */ | |
424ab01d QY |
220 | stream_free(peer->curr); |
221 | peer->curr = NULL; | |
222 | } | |
223 | ||
224 | // copy each packet from old peer's output queue to new peer | |
727c4f87 QY |
225 | while (from_peer->obuf->head) |
226 | stream_fifo_push(peer->obuf, | |
227 | stream_fifo_pop(from_peer->obuf)); | |
424ab01d QY |
228 | |
229 | // copy each packet from old peer's input queue to new peer | |
230 | while (from_peer->ibuf->head) | |
231 | stream_fifo_push(peer->ibuf, | |
232 | stream_fifo_pop(from_peer->ibuf)); | |
7db44ec8 | 233 | |
74ffbfe6 QY |
234 | ringbuf_wipe(peer->ibuf_work); |
235 | ringbuf_copy(peer->ibuf_work, from_peer->ibuf_work, | |
236 | ringbuf_remain(from_peer->ibuf_work)); | |
d3ecc69e | 237 | } |
d62a17ae | 238 | |
239 | peer->as = from_peer->as; | |
240 | peer->v_holdtime = from_peer->v_holdtime; | |
241 | peer->v_keepalive = from_peer->v_keepalive; | |
d62a17ae | 242 | peer->v_routeadv = from_peer->v_routeadv; |
6c537a18 | 243 | peer->v_delayopen = from_peer->v_delayopen; |
d62a17ae | 244 | peer->v_gr_restart = from_peer->v_gr_restart; |
245 | peer->cap = from_peer->cap; | |
246 | status = peer->status; | |
247 | pstatus = peer->ostatus; | |
248 | last_evt = peer->last_event; | |
249 | last_maj_evt = peer->last_major_event; | |
250 | peer->status = from_peer->status; | |
251 | peer->ostatus = from_peer->ostatus; | |
252 | peer->last_event = from_peer->last_event; | |
253 | peer->last_major_event = from_peer->last_major_event; | |
254 | from_peer->status = status; | |
255 | from_peer->ostatus = pstatus; | |
256 | from_peer->last_event = last_evt; | |
257 | from_peer->last_major_event = last_maj_evt; | |
258 | peer->remote_id = from_peer->remote_id; | |
3577f1c5 | 259 | peer->last_reset = from_peer->last_reset; |
0db06e37 | 260 | peer->max_packet_size = from_peer->max_packet_size; |
d62a17ae | 261 | |
36235319 QY |
262 | BGP_GR_ROUTER_DETECT_AND_SEND_CAPABILITY_TO_ZEBRA(peer->bgp, |
263 | peer->bgp->peer); | |
8c48b3b6 | 264 | |
d7b3cda6 | 265 | if (bgp_peer_gr_mode_get(peer) == PEER_DISABLE) { |
266 | ||
267 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
268 | ||
36235319 | 269 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { |
d7b3cda6 | 270 | peer_nsf_stop(peer); |
271 | } | |
272 | } | |
273 | ||
d62a17ae | 274 | if (from_peer->hostname != NULL) { |
275 | if (peer->hostname) { | |
276 | XFREE(MTYPE_BGP_PEER_HOST, peer->hostname); | |
277 | peer->hostname = NULL; | |
278 | } | |
279 | ||
280 | peer->hostname = from_peer->hostname; | |
281 | from_peer->hostname = NULL; | |
282 | } | |
283 | ||
284 | if (from_peer->domainname != NULL) { | |
285 | if (peer->domainname) { | |
286 | XFREE(MTYPE_BGP_PEER_HOST, peer->domainname); | |
287 | peer->domainname = NULL; | |
288 | } | |
289 | ||
290 | peer->domainname = from_peer->domainname; | |
291 | from_peer->domainname = NULL; | |
292 | } | |
293 | ||
05c7a1cc | 294 | FOREACH_AFI_SAFI (afi, safi) { |
05c7a1cc QY |
295 | peer->af_sflags[afi][safi] = from_peer->af_sflags[afi][safi]; |
296 | peer->af_cap[afi][safi] = from_peer->af_cap[afi][safi]; | |
297 | peer->afc_nego[afi][safi] = from_peer->afc_nego[afi][safi]; | |
298 | peer->afc_adv[afi][safi] = from_peer->afc_adv[afi][safi]; | |
299 | peer->afc_recv[afi][safi] = from_peer->afc_recv[afi][safi]; | |
300 | peer->orf_plist[afi][safi] = from_peer->orf_plist[afi][safi]; | |
1479ed2f | 301 | peer->llgr[afi][safi] = from_peer->llgr[afi][safi]; |
05c7a1cc | 302 | } |
d62a17ae | 303 | |
304 | if (bgp_getsockname(peer) < 0) { | |
af4c2728 | 305 | flog_err( |
450971aa | 306 | EC_LIB_SOCKET, |
d62a17ae | 307 | "%%bgp_getsockname() failed for %s peer %s fd %d (from_peer fd %d)", |
308 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER) | |
309 | ? "accept" | |
310 | : ""), | |
311 | peer->host, peer->fd, from_peer->fd); | |
6c4d8732 SP |
312 | BGP_EVENT_ADD(peer, BGP_Stop); |
313 | BGP_EVENT_ADD(from_peer, BGP_Stop); | |
d62a17ae | 314 | return NULL; |
315 | } | |
316 | if (from_peer->status > Active) { | |
317 | if (bgp_getsockname(from_peer) < 0) { | |
af4c2728 | 318 | flog_err( |
450971aa | 319 | EC_LIB_SOCKET, |
d62a17ae | 320 | "%%bgp_getsockname() failed for %s from_peer %s fd %d (peer fd %d)", |
14454c9f | 321 | |
d62a17ae | 322 | (CHECK_FLAG(from_peer->sflags, |
323 | PEER_STATUS_ACCEPT_PEER) | |
324 | ? "accept" | |
325 | : ""), | |
326 | from_peer->host, from_peer->fd, peer->fd); | |
327 | bgp_stop(from_peer); | |
328 | from_peer = NULL; | |
329 | } | |
330 | } | |
331 | ||
0112e9e0 QY |
332 | |
333 | // Note: peer_xfer_stats() must be called with I/O turned OFF | |
334 | if (from_peer) | |
335 | peer_xfer_stats(peer, from_peer); | |
336 | ||
e2d3a909 | 337 | /* Register peer for NHT. This is to allow RAs to be enabled when |
338 | * needed, even on a passive connection. | |
339 | */ | |
340 | bgp_peer_reg_with_nht(peer); | |
996319e6 DS |
341 | if (from_peer) |
342 | bgp_replace_nexthop_by_peer(from_peer, peer); | |
e2d3a909 | 343 | |
424ab01d QY |
344 | bgp_reads_on(peer); |
345 | bgp_writes_on(peer); | |
e0d550df MS |
346 | thread_add_event(bm->master, bgp_process_packet, peer, 0, |
347 | &peer->t_process_packet); | |
d62a17ae | 348 | |
d62a17ae | 349 | return (peer); |
1ff9a340 DS |
350 | } |
351 | ||
718e3744 | 352 | /* Hook function called after bgp event is occered. And vty's |
353 | neighbor command invoke this function after making neighbor | |
354 | structure. */ | |
d62a17ae | 355 | void bgp_timer_set(struct peer *peer) |
718e3744 | 356 | { |
1479ed2f DA |
357 | afi_t afi; |
358 | safi_t safi; | |
359 | ||
d62a17ae | 360 | switch (peer->status) { |
361 | case Idle: | |
362 | /* First entry point of peer's finite state machine. In Idle | |
363 | status start timer is on unless peer is shutdown or peer is | |
364 | inactive. All other timer must be turned off */ | |
f62abc7d | 365 | if (BGP_PEER_START_SUPPRESSED(peer) || !peer_active(peer) |
2c1eba8e | 366 | || peer->bgp->vrf_id == VRF_UNKNOWN) { |
d62a17ae | 367 | BGP_TIMER_OFF(peer->t_start); |
368 | } else { | |
369 | BGP_TIMER_ON(peer->t_start, bgp_start_timer, | |
370 | peer->v_start); | |
371 | } | |
372 | BGP_TIMER_OFF(peer->t_connect); | |
373 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 374 | bgp_keepalives_off(peer); |
d62a17ae | 375 | BGP_TIMER_OFF(peer->t_routeadv); |
6c537a18 | 376 | BGP_TIMER_OFF(peer->t_delayopen); |
d62a17ae | 377 | break; |
378 | ||
379 | case Connect: | |
380 | /* After start timer is expired, the peer moves to Connect | |
381 | status. Make sure start timer is off and connect timer is | |
382 | on. */ | |
383 | BGP_TIMER_OFF(peer->t_start); | |
6c537a18 DS |
384 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER_DELAYOPEN)) |
385 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
386 | (peer->v_delayopen + peer->v_connect)); | |
387 | else | |
388 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
389 | peer->v_connect); | |
390 | ||
d62a17ae | 391 | BGP_TIMER_OFF(peer->t_holdtime); |
b72b6f4f | 392 | bgp_keepalives_off(peer); |
d62a17ae | 393 | BGP_TIMER_OFF(peer->t_routeadv); |
394 | break; | |
395 | ||
396 | case Active: | |
397 | /* Active is waiting connection from remote peer. And if | |
398 | connect timer is expired, change status to Connect. */ | |
399 | BGP_TIMER_OFF(peer->t_start); | |
400 | /* If peer is passive mode, do not set connect timer. */ | |
401 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE) | |
402 | || CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
403 | BGP_TIMER_OFF(peer->t_connect); | |
404 | } else { | |
6c537a18 DS |
405 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER_DELAYOPEN)) |
406 | BGP_TIMER_ON( | |
407 | peer->t_connect, bgp_connect_timer, | |
408 | (peer->v_delayopen + peer->v_connect)); | |
409 | else | |
410 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
411 | peer->v_connect); | |
d62a17ae | 412 | } |
413 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 414 | bgp_keepalives_off(peer); |
d62a17ae | 415 | BGP_TIMER_OFF(peer->t_routeadv); |
416 | break; | |
417 | ||
418 | case OpenSent: | |
419 | /* OpenSent status. */ | |
420 | BGP_TIMER_OFF(peer->t_start); | |
421 | BGP_TIMER_OFF(peer->t_connect); | |
422 | if (peer->v_holdtime != 0) { | |
423 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
424 | peer->v_holdtime); | |
425 | } else { | |
426 | BGP_TIMER_OFF(peer->t_holdtime); | |
427 | } | |
b72b6f4f | 428 | bgp_keepalives_off(peer); |
d62a17ae | 429 | BGP_TIMER_OFF(peer->t_routeadv); |
6c537a18 | 430 | BGP_TIMER_OFF(peer->t_delayopen); |
d62a17ae | 431 | break; |
432 | ||
433 | case OpenConfirm: | |
434 | /* OpenConfirm status. */ | |
435 | BGP_TIMER_OFF(peer->t_start); | |
436 | BGP_TIMER_OFF(peer->t_connect); | |
437 | ||
438 | /* If the negotiated Hold Time value is zero, then the Hold Time | |
439 | timer and KeepAlive timers are not started. */ | |
440 | if (peer->v_holdtime == 0) { | |
441 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 442 | bgp_keepalives_off(peer); |
d62a17ae | 443 | } else { |
444 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
445 | peer->v_holdtime); | |
b72b6f4f | 446 | bgp_keepalives_on(peer); |
d62a17ae | 447 | } |
448 | BGP_TIMER_OFF(peer->t_routeadv); | |
6c537a18 | 449 | BGP_TIMER_OFF(peer->t_delayopen); |
d62a17ae | 450 | break; |
451 | ||
452 | case Established: | |
453 | /* In Established status start and connect timer is turned | |
454 | off. */ | |
455 | BGP_TIMER_OFF(peer->t_start); | |
456 | BGP_TIMER_OFF(peer->t_connect); | |
6c537a18 | 457 | BGP_TIMER_OFF(peer->t_delayopen); |
d62a17ae | 458 | |
459 | /* Same as OpenConfirm, if holdtime is zero then both holdtime | |
460 | and keepalive must be turned off. */ | |
461 | if (peer->v_holdtime == 0) { | |
462 | BGP_TIMER_OFF(peer->t_holdtime); | |
bea01226 | 463 | bgp_keepalives_off(peer); |
d62a17ae | 464 | } else { |
465 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
466 | peer->v_holdtime); | |
bea01226 | 467 | bgp_keepalives_on(peer); |
d62a17ae | 468 | } |
469 | break; | |
470 | case Deleted: | |
471 | BGP_TIMER_OFF(peer->t_gr_restart); | |
472 | BGP_TIMER_OFF(peer->t_gr_stale); | |
1479ed2f DA |
473 | |
474 | FOREACH_AFI_SAFI (afi, safi) | |
475 | BGP_TIMER_OFF(peer->t_llgr_stale[afi][safi]); | |
476 | ||
d62a17ae | 477 | BGP_TIMER_OFF(peer->t_pmax_restart); |
9af52ccf | 478 | BGP_TIMER_OFF(peer->t_refresh_stalepath); |
d62a17ae | 479 | /* fallthru */ |
480 | case Clearing: | |
481 | BGP_TIMER_OFF(peer->t_start); | |
482 | BGP_TIMER_OFF(peer->t_connect); | |
483 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 484 | bgp_keepalives_off(peer); |
d62a17ae | 485 | BGP_TIMER_OFF(peer->t_routeadv); |
6c537a18 | 486 | BGP_TIMER_OFF(peer->t_delayopen); |
d62a17ae | 487 | break; |
8398b5d5 DS |
488 | case BGP_STATUS_MAX: |
489 | flog_err(EC_LIB_DEVELOPMENT, | |
490 | "BGP_STATUS_MAX while a legal state is not valid state for the FSM"); | |
491 | break; | |
718e3744 | 492 | } |
718e3744 | 493 | } |
494 | ||
495 | /* BGP start timer. This function set BGP_Start event to thread value | |
496 | and process event. */ | |
cc9f21da | 497 | static void bgp_start_timer(struct thread *thread) |
718e3744 | 498 | { |
d62a17ae | 499 | struct peer *peer; |
718e3744 | 500 | |
d62a17ae | 501 | peer = THREAD_ARG(thread); |
718e3744 | 502 | |
d62a17ae | 503 | if (bgp_debug_neighbor_events(peer)) |
504 | zlog_debug("%s [FSM] Timer (start timer expire).", peer->host); | |
718e3744 | 505 | |
d62a17ae | 506 | THREAD_VAL(thread) = BGP_Start; |
507 | bgp_event(thread); /* bgp_event unlocks peer */ | |
718e3744 | 508 | } |
509 | ||
510 | /* BGP connect retry timer. */ | |
cc9f21da | 511 | static void bgp_connect_timer(struct thread *thread) |
718e3744 | 512 | { |
d62a17ae | 513 | struct peer *peer; |
d62a17ae | 514 | |
515 | peer = THREAD_ARG(thread); | |
424ab01d | 516 | |
6c537a18 | 517 | /* stop the DelayOpenTimer if it is running */ |
22472fee | 518 | BGP_TIMER_OFF(peer->t_delayopen); |
6c537a18 | 519 | |
424ab01d QY |
520 | assert(!peer->t_write); |
521 | assert(!peer->t_read); | |
522 | ||
d62a17ae | 523 | if (bgp_debug_neighbor_events(peer)) |
524 | zlog_debug("%s [FSM] Timer (connect timer expire)", peer->host); | |
525 | ||
cc9f21da | 526 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
d62a17ae | 527 | bgp_stop(peer); |
cc9f21da | 528 | else { |
d62a17ae | 529 | THREAD_VAL(thread) = ConnectRetry_timer_expired; |
530 | bgp_event(thread); /* bgp_event unlocks peer */ | |
d62a17ae | 531 | } |
718e3744 | 532 | } |
533 | ||
534 | /* BGP holdtime timer. */ | |
cc9f21da | 535 | static void bgp_holdtime_timer(struct thread *thread) |
718e3744 | 536 | { |
d0874d19 | 537 | atomic_size_t inq_count; |
d62a17ae | 538 | struct peer *peer; |
718e3744 | 539 | |
d62a17ae | 540 | peer = THREAD_ARG(thread); |
718e3744 | 541 | |
d62a17ae | 542 | if (bgp_debug_neighbor_events(peer)) |
543 | zlog_debug("%s [FSM] Timer (holdtime timer expire)", | |
544 | peer->host); | |
718e3744 | 545 | |
d0874d19 DS |
546 | /* |
547 | * Given that we do not have any expectation of ordering | |
548 | * for handling packets from a peer -vs- handling | |
549 | * the hold timer for a peer as that they are both | |
550 | * events on the peer. If we have incoming | |
551 | * data on the peers inq, let's give the system a chance | |
552 | * to handle that data. This can be especially true | |
553 | * for systems where we are heavily loaded for one | |
554 | * reason or another. | |
555 | */ | |
556 | inq_count = atomic_load_explicit(&peer->ibuf->count, | |
557 | memory_order_relaxed); | |
cc9f21da | 558 | if (inq_count) |
d0874d19 DS |
559 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, |
560 | peer->v_holdtime); | |
561 | ||
d62a17ae | 562 | THREAD_VAL(thread) = Hold_Timer_expired; |
563 | bgp_event(thread); /* bgp_event unlocks peer */ | |
718e3744 | 564 | } |
565 | ||
cc9f21da | 566 | void bgp_routeadv_timer(struct thread *thread) |
718e3744 | 567 | { |
d62a17ae | 568 | struct peer *peer; |
718e3744 | 569 | |
d62a17ae | 570 | peer = THREAD_ARG(thread); |
718e3744 | 571 | |
d62a17ae | 572 | if (bgp_debug_neighbor_events(peer)) |
573 | zlog_debug("%s [FSM] Timer (routeadv timer expire)", | |
574 | peer->host); | |
718e3744 | 575 | |
d62a17ae | 576 | peer->synctime = bgp_clock(); |
718e3744 | 577 | |
a9794991 | 578 | thread_add_timer_msec(bm->master, bgp_generate_updgrp_packets, peer, 0, |
424ab01d QY |
579 | &peer->t_generate_updgrp_packets); |
580 | ||
d62a17ae | 581 | /* MRAI timer will be started again when FIFO is built, no need to |
582 | * do it here. | |
583 | */ | |
718e3744 | 584 | } |
585 | ||
6c537a18 | 586 | /* RFC 4271 DelayOpenTimer */ |
cc9f21da | 587 | void bgp_delayopen_timer(struct thread *thread) |
6c537a18 DS |
588 | { |
589 | struct peer *peer; | |
590 | ||
591 | peer = THREAD_ARG(thread); | |
592 | ||
593 | if (bgp_debug_neighbor_events(peer)) | |
594 | zlog_debug("%s [FSM] Timer (DelayOpentimer expire)", | |
595 | peer->host); | |
596 | ||
597 | THREAD_VAL(thread) = DelayOpen_timer_expired; | |
598 | bgp_event(thread); /* bgp_event unlocks peer */ | |
6c537a18 DS |
599 | } |
600 | ||
e0701b79 | 601 | /* BGP Peer Down Cause */ |
2b64873d | 602 | const char *const peer_down_str[] = {"", |
d62a17ae | 603 | "Router ID changed", |
604 | "Remote AS changed", | |
605 | "Local AS change", | |
606 | "Cluster ID changed", | |
607 | "Confederation identifier changed", | |
608 | "Confederation peer changed", | |
609 | "RR client config change", | |
610 | "RS client config change", | |
611 | "Update source change", | |
612 | "Address family activated", | |
613 | "Admin. shutdown", | |
614 | "User reset", | |
615 | "BGP Notification received", | |
616 | "BGP Notification send", | |
617 | "Peer closed the session", | |
618 | "Neighbor deleted", | |
619 | "Peer-group add member", | |
620 | "Peer-group delete member", | |
621 | "Capability changed", | |
622 | "Passive config change", | |
623 | "Multihop config change", | |
624 | "NSF peer closed the session", | |
625 | "Intf peering v6only config change", | |
626 | "BFD down received", | |
627 | "Interface down", | |
05912a17 | 628 | "Neighbor address lost", |
3577f1c5 | 629 | "Waiting for NHT", |
05912a17 DD |
630 | "Waiting for Peer IPv6 LLA", |
631 | "Waiting for VRF to be initialized", | |
1e91f1d1 DS |
632 | "No AFI/SAFI activated for peer", |
633 | "AS Set config change", | |
07d1e5d9 | 634 | "Waiting for peer OPEN", |
c5fe9095 DS |
635 | "Reached received prefix count", |
636 | "Socket Error"}; | |
d62a17ae | 637 | |
1479ed2f | 638 | static void bgp_graceful_restart_timer_off(struct peer *peer) |
e0701b79 | 639 | { |
d62a17ae | 640 | afi_t afi; |
641 | safi_t safi; | |
642 | ||
1479ed2f DA |
643 | FOREACH_AFI_SAFI (afi, safi) |
644 | if (CHECK_FLAG(peer->af_sflags[afi][safi], | |
645 | PEER_STATUS_LLGR_WAIT)) | |
646 | return; | |
d62a17ae | 647 | |
648 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
649 | BGP_TIMER_OFF(peer->t_gr_stale); | |
af8496af DA |
650 | |
651 | if (peer_dynamic_neighbor(peer) && | |
652 | !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
653 | if (bgp_debug_neighbor_events(peer)) | |
31afff83 DA |
654 | zlog_debug("%s (dynamic neighbor) deleted (%s)", |
655 | peer->host, __func__); | |
af8496af DA |
656 | peer_delete(peer); |
657 | } | |
658 | ||
1479ed2f DA |
659 | bgp_timer_set(peer); |
660 | } | |
661 | ||
cc9f21da | 662 | static void bgp_llgr_stale_timer_expire(struct thread *thread) |
1479ed2f DA |
663 | { |
664 | struct peer_af *paf; | |
665 | struct peer *peer; | |
666 | afi_t afi; | |
667 | safi_t safi; | |
668 | ||
669 | paf = THREAD_ARG(thread); | |
670 | ||
671 | peer = paf->peer; | |
672 | afi = paf->afi; | |
673 | safi = paf->safi; | |
674 | ||
675 | /* If the timer for the "Long-lived Stale Time" expires before the | |
676 | * session is re-established, the helper MUST delete all the | |
677 | * stale routes from the neighbor that it is retaining. | |
678 | */ | |
679 | if (bgp_debug_neighbor_events(peer)) | |
680 | zlog_debug("%s Long-lived stale timer (%s) expired", peer->host, | |
681 | get_afi_safi_str(afi, safi, false)); | |
682 | ||
683 | UNSET_FLAG(peer->af_sflags[afi][safi], PEER_STATUS_LLGR_WAIT); | |
684 | ||
685 | bgp_clear_stale_route(peer, afi, safi); | |
686 | ||
687 | bgp_graceful_restart_timer_off(peer); | |
1479ed2f DA |
688 | } |
689 | ||
690 | static void bgp_set_llgr_stale(struct peer *peer, afi_t afi, safi_t safi) | |
691 | { | |
692 | struct bgp_dest *dest; | |
693 | struct bgp_path_info *pi; | |
694 | struct bgp_table *table; | |
695 | struct attr attr; | |
696 | ||
697 | if (safi == SAFI_MPLS_VPN || safi == SAFI_ENCAP || safi == SAFI_EVPN) { | |
698 | for (dest = bgp_table_top(peer->bgp->rib[afi][safi]); dest; | |
699 | dest = bgp_route_next(dest)) { | |
700 | struct bgp_dest *rm; | |
701 | ||
702 | table = bgp_dest_get_bgp_table_info(dest); | |
703 | if (!table) | |
704 | continue; | |
705 | ||
706 | for (rm = bgp_table_top(table); rm; | |
707 | rm = bgp_route_next(rm)) | |
708 | for (pi = bgp_dest_get_bgp_path_info(rm); pi; | |
709 | pi = pi->next) { | |
710 | if (pi->peer != peer) | |
711 | continue; | |
712 | ||
9a706b42 | 713 | if (bgp_attr_get_community(pi->attr) && |
1479ed2f | 714 | community_include( |
9a706b42 DA |
715 | bgp_attr_get_community( |
716 | pi->attr), | |
1479ed2f DA |
717 | COMMUNITY_NO_LLGR)) |
718 | continue; | |
719 | ||
720 | if (bgp_debug_neighbor_events(peer)) | |
721 | zlog_debug( | |
722 | "%s Long-lived set stale community (LLGR_STALE) for: %pFX", | |
723 | peer->host, &dest->p); | |
724 | ||
725 | attr = *pi->attr; | |
726 | bgp_attr_add_llgr_community(&attr); | |
727 | pi->attr = bgp_attr_intern(&attr); | |
728 | bgp_recalculate_afi_safi_bestpaths( | |
729 | peer->bgp, afi, safi); | |
730 | ||
731 | break; | |
732 | } | |
733 | } | |
734 | } else { | |
735 | for (dest = bgp_table_top(peer->bgp->rib[afi][safi]); dest; | |
736 | dest = bgp_route_next(dest)) | |
737 | for (pi = bgp_dest_get_bgp_path_info(dest); pi; | |
738 | pi = pi->next) { | |
739 | if (pi->peer != peer) | |
740 | continue; | |
741 | ||
9a706b42 DA |
742 | if (bgp_attr_get_community(pi->attr) && |
743 | community_include( | |
744 | bgp_attr_get_community(pi->attr), | |
745 | COMMUNITY_NO_LLGR)) | |
1479ed2f DA |
746 | continue; |
747 | ||
748 | if (bgp_debug_neighbor_events(peer)) | |
749 | zlog_debug( | |
750 | "%s Long-lived set stale community (LLGR_STALE) for: %pFX", | |
751 | peer->host, &dest->p); | |
752 | ||
753 | attr = *pi->attr; | |
754 | bgp_attr_add_llgr_community(&attr); | |
755 | pi->attr = bgp_attr_intern(&attr); | |
756 | bgp_recalculate_afi_safi_bestpaths(peer->bgp, | |
757 | afi, safi); | |
758 | ||
759 | break; | |
760 | } | |
761 | } | |
762 | } | |
763 | ||
cc9f21da | 764 | static void bgp_graceful_restart_timer_expire(struct thread *thread) |
1479ed2f DA |
765 | { |
766 | struct peer *peer, *tmp_peer; | |
767 | struct listnode *node, *nnode; | |
768 | struct peer_af *paf; | |
769 | afi_t afi; | |
770 | safi_t safi; | |
771 | ||
772 | peer = THREAD_ARG(thread); | |
d62a17ae | 773 | |
774 | if (bgp_debug_neighbor_events(peer)) { | |
775 | zlog_debug("%s graceful restart timer expired", peer->host); | |
776 | zlog_debug("%s graceful restart stalepath timer stopped", | |
777 | peer->host); | |
778 | } | |
93406d87 | 779 | |
1479ed2f DA |
780 | FOREACH_AFI_SAFI (afi, safi) { |
781 | if (!peer->nsf[afi][safi]) | |
782 | continue; | |
783 | ||
784 | /* Once the "Restart Time" period ends, the LLGR period is | |
785 | * said to have begun and the following procedures MUST be | |
786 | * performed: | |
787 | * | |
788 | * The helper router MUST start a timer for the | |
789 | * "Long-lived Stale Time". | |
790 | * | |
791 | * The helper router MUST attach the LLGR_STALE community | |
792 | * for the stale routes being retained. Note that this | |
793 | * requirement implies that the routes would need to be | |
794 | * readvertised, to disseminate the modified community. | |
795 | */ | |
796 | if (peer->llgr[afi][safi].stale_time) { | |
797 | paf = peer_af_find(peer, afi, safi); | |
798 | if (!paf) | |
799 | continue; | |
800 | ||
801 | if (bgp_debug_neighbor_events(peer)) | |
802 | zlog_debug( | |
803 | "%s Long-lived stale timer (%s) started for %d sec", | |
804 | peer->host, | |
805 | get_afi_safi_str(afi, safi, false), | |
806 | peer->llgr[afi][safi].stale_time); | |
807 | ||
808 | SET_FLAG(peer->af_sflags[afi][safi], | |
809 | PEER_STATUS_LLGR_WAIT); | |
810 | ||
811 | bgp_set_llgr_stale(peer, afi, safi); | |
812 | bgp_clear_stale_route(peer, afi, safi); | |
813 | ||
814 | thread_add_timer(bm->master, | |
815 | bgp_llgr_stale_timer_expire, paf, | |
816 | peer->llgr[afi][safi].stale_time, | |
817 | &peer->t_llgr_stale[afi][safi]); | |
818 | ||
819 | for (ALL_LIST_ELEMENTS(peer->bgp->peer, node, nnode, | |
820 | tmp_peer)) | |
821 | bgp_announce_route(tmp_peer, afi, safi, false); | |
822 | } else { | |
823 | bgp_clear_stale_route(peer, afi, safi); | |
824 | } | |
825 | } | |
826 | ||
827 | bgp_graceful_restart_timer_off(peer); | |
93406d87 | 828 | } |
829 | ||
cc9f21da | 830 | static void bgp_graceful_stale_timer_expire(struct thread *thread) |
93406d87 | 831 | { |
d62a17ae | 832 | struct peer *peer; |
833 | afi_t afi; | |
834 | safi_t safi; | |
93406d87 | 835 | |
d62a17ae | 836 | peer = THREAD_ARG(thread); |
93406d87 | 837 | |
d62a17ae | 838 | if (bgp_debug_neighbor_events(peer)) |
839 | zlog_debug("%s graceful restart stalepath timer expired", | |
840 | peer->host); | |
93406d87 | 841 | |
d62a17ae | 842 | /* NSF delete stale route */ |
df8d723c DA |
843 | FOREACH_AFI_SAFI_NSF (afi, safi) |
844 | if (peer->nsf[afi][safi]) | |
845 | bgp_clear_stale_route(peer, afi, safi); | |
93406d87 | 846 | } |
847 | ||
f009ff26 | 848 | /* Selection deferral timer processing function */ |
cc9f21da | 849 | static void bgp_graceful_deferral_timer_expire(struct thread *thread) |
f009ff26 | 850 | { |
851 | struct afi_safi_info *info; | |
852 | afi_t afi; | |
853 | safi_t safi; | |
854 | struct bgp *bgp; | |
855 | ||
856 | info = THREAD_ARG(thread); | |
857 | afi = info->afi; | |
858 | safi = info->safi; | |
859 | bgp = info->bgp; | |
860 | ||
861 | if (BGP_DEBUG(update, UPDATE_OUT)) | |
13909c4f DS |
862 | zlog_debug( |
863 | "afi %d, safi %d : graceful restart deferral timer expired", | |
864 | afi, safi); | |
f009ff26 | 865 | |
f009ff26 | 866 | bgp->gr_info[afi][safi].eor_required = 0; |
867 | bgp->gr_info[afi][safi].eor_received = 0; | |
868 | XFREE(MTYPE_TMP, info); | |
869 | ||
870 | /* Best path selection */ | |
cc9f21da | 871 | bgp_best_path_select_defer(bgp, afi, safi); |
f009ff26 | 872 | } |
873 | ||
3dc339cd | 874 | static bool bgp_update_delay_applicable(struct bgp *bgp) |
f188f2c4 | 875 | { |
d62a17ae | 876 | /* update_delay_over flag should be reset (set to 0) for any new |
877 | applicability of the update-delay during BGP process lifetime. | |
878 | And it should be set after an occurence of the update-delay is | |
879 | over)*/ | |
880 | if (!bgp->update_delay_over) | |
3dc339cd DA |
881 | return true; |
882 | return false; | |
f188f2c4 DS |
883 | } |
884 | ||
3dc339cd | 885 | bool bgp_update_delay_active(struct bgp *bgp) |
f188f2c4 | 886 | { |
d62a17ae | 887 | if (bgp->t_update_delay) |
3dc339cd DA |
888 | return true; |
889 | return false; | |
f188f2c4 DS |
890 | } |
891 | ||
3dc339cd | 892 | bool bgp_update_delay_configured(struct bgp *bgp) |
f188f2c4 | 893 | { |
d62a17ae | 894 | if (bgp->v_update_delay) |
3dc339cd DA |
895 | return true; |
896 | return false; | |
f188f2c4 DS |
897 | } |
898 | ||
899 | /* Do the post-processing needed when bgp comes out of the read-only mode | |
900 | on ending the update delay. */ | |
d62a17ae | 901 | void bgp_update_delay_end(struct bgp *bgp) |
f188f2c4 | 902 | { |
50478845 MS |
903 | THREAD_OFF(bgp->t_update_delay); |
904 | THREAD_OFF(bgp->t_establish_wait); | |
d62a17ae | 905 | |
906 | /* Reset update-delay related state */ | |
907 | bgp->update_delay_over = 1; | |
908 | bgp->established = 0; | |
909 | bgp->restarted_peers = 0; | |
910 | bgp->implicit_eors = 0; | |
911 | bgp->explicit_eors = 0; | |
912 | ||
e36f61b5 DS |
913 | frr_timestamp(3, bgp->update_delay_end_time, |
914 | sizeof(bgp->update_delay_end_time)); | |
d62a17ae | 915 | |
916 | /* | |
917 | * Add an end-of-initial-update marker to the main process queues so | |
918 | * that | |
919 | * the route advertisement timer for the peers can be started. Also set | |
920 | * the zebra and peer update hold flags. These flags are used to achieve | |
921 | * three stages in the update-delay post processing: | |
922 | * 1. Finish best-path selection for all the prefixes held on the | |
923 | * queues. | |
924 | * (routes in BGP are updated, and peers sync queues are populated | |
925 | * too) | |
926 | * 2. As the eoiu mark is reached in the bgp process routine, ship all | |
927 | * the | |
928 | * routes to zebra. With that zebra should see updates from BGP | |
929 | * close | |
930 | * to each other. | |
931 | * 3. Unblock the peer update writes. With that peer update packing | |
932 | * with | |
933 | * the prefixes should be at its maximum. | |
934 | */ | |
935 | bgp_add_eoiu_mark(bgp); | |
936 | bgp->main_zebra_update_hold = 1; | |
937 | bgp->main_peers_update_hold = 1; | |
938 | ||
b6c386bb DS |
939 | /* |
940 | * Resume the queue processing. This should trigger the event that would | |
941 | * take care of processing any work that was queued during the read-only | |
942 | * mode. | |
943 | */ | |
944 | work_queue_unplug(bgp->process_queue); | |
f188f2c4 DS |
945 | } |
946 | ||
cb1faec9 DS |
947 | /** |
948 | * see bgp_fsm.h | |
949 | */ | |
d62a17ae | 950 | void bgp_start_routeadv(struct bgp *bgp) |
cb1faec9 | 951 | { |
d62a17ae | 952 | struct listnode *node, *nnode; |
953 | struct peer *peer; | |
cb1faec9 | 954 | |
d62a17ae | 955 | zlog_info("bgp_start_routeadv(), update hold status %d", |
956 | bgp->main_peers_update_hold); | |
4a16ae86 | 957 | |
d62a17ae | 958 | if (bgp->main_peers_update_hold) |
959 | return; | |
4a16ae86 | 960 | |
e36f61b5 DS |
961 | frr_timestamp(3, bgp->update_delay_peers_resume_time, |
962 | sizeof(bgp->update_delay_peers_resume_time)); | |
4a16ae86 | 963 | |
d62a17ae | 964 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) { |
feb17238 | 965 | if (!peer_established(peer)) |
d62a17ae | 966 | continue; |
967 | BGP_TIMER_OFF(peer->t_routeadv); | |
968 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
969 | } | |
cb1faec9 DS |
970 | } |
971 | ||
972 | /** | |
973 | * see bgp_fsm.h | |
974 | */ | |
d62a17ae | 975 | void bgp_adjust_routeadv(struct peer *peer) |
cb1faec9 | 976 | { |
d62a17ae | 977 | time_t nowtime = bgp_clock(); |
978 | double diff; | |
979 | unsigned long remain; | |
980 | ||
981 | /* Bypass checks for special case of MRAI being 0 */ | |
982 | if (peer->v_routeadv == 0) { | |
983 | /* Stop existing timer, just in case it is running for a | |
984 | * different | |
985 | * duration and schedule write thread immediately. | |
986 | */ | |
22472fee | 987 | BGP_TIMER_OFF(peer->t_routeadv); |
d62a17ae | 988 | |
989 | peer->synctime = bgp_clock(); | |
a77e2f4b S |
990 | /* If suppress fib pending is enabled, route is advertised to |
991 | * peers when the status is received from the FIB. The delay | |
992 | * is added to update group packet generate which will allow | |
993 | * more routes to be sent in the update message | |
994 | */ | |
995 | BGP_UPDATE_GROUP_TIMER_ON(&peer->t_generate_updgrp_packets, | |
996 | bgp_generate_updgrp_packets); | |
d62a17ae | 997 | return; |
998 | } | |
999 | ||
1000 | ||
1001 | /* | |
1002 | * CASE I: | |
1003 | * If the last update was written more than MRAI back, expire the timer | |
1004 | * instantly so that we can send the update out sooner. | |
1005 | * | |
1006 | * <------- MRAI ---------> | |
1007 | * |-----------------|-----------------------| | |
1008 | * <------------- m ------------> | |
1009 | * ^ ^ ^ | |
1010 | * | | | | |
1011 | * | | current time | |
1012 | * | timer start | |
1013 | * last write | |
1014 | * | |
1015 | * m > MRAI | |
1016 | */ | |
1017 | diff = difftime(nowtime, peer->last_update); | |
1018 | if (diff > (double)peer->v_routeadv) { | |
1019 | BGP_TIMER_OFF(peer->t_routeadv); | |
1020 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
1021 | return; | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * CASE II: | |
1026 | * - Find when to expire the MRAI timer. | |
1027 | * If MRAI timer is not active, assume we can start it now. | |
1028 | * | |
1029 | * <------- MRAI ---------> | |
1030 | * |------------|-----------------------| | |
1031 | * <-------- m ----------><----- r -----> | |
1032 | * ^ ^ ^ | |
1033 | * | | | | |
1034 | * | | current time | |
1035 | * | timer start | |
1036 | * last write | |
1037 | * | |
1038 | * (MRAI - m) < r | |
1039 | */ | |
1040 | if (peer->t_routeadv) | |
1041 | remain = thread_timer_remain_second(peer->t_routeadv); | |
1042 | else | |
1043 | remain = peer->v_routeadv; | |
1044 | diff = peer->v_routeadv - diff; | |
1045 | if (diff <= (double)remain) { | |
1046 | BGP_TIMER_OFF(peer->t_routeadv); | |
1047 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, diff); | |
1048 | } | |
cb1faec9 DS |
1049 | } |
1050 | ||
3dc339cd | 1051 | static bool bgp_maxmed_onstartup_applicable(struct bgp *bgp) |
abc920f8 | 1052 | { |
d62a17ae | 1053 | if (!bgp->maxmed_onstartup_over) |
3dc339cd DA |
1054 | return true; |
1055 | return false; | |
abc920f8 DS |
1056 | } |
1057 | ||
3dc339cd | 1058 | bool bgp_maxmed_onstartup_configured(struct bgp *bgp) |
abc920f8 | 1059 | { |
d62a17ae | 1060 | if (bgp->v_maxmed_onstartup != BGP_MAXMED_ONSTARTUP_UNCONFIGURED) |
3dc339cd DA |
1061 | return true; |
1062 | return false; | |
abc920f8 DS |
1063 | } |
1064 | ||
3dc339cd | 1065 | bool bgp_maxmed_onstartup_active(struct bgp *bgp) |
abc920f8 | 1066 | { |
d62a17ae | 1067 | if (bgp->t_maxmed_onstartup) |
3dc339cd DA |
1068 | return true; |
1069 | return false; | |
abc920f8 DS |
1070 | } |
1071 | ||
d62a17ae | 1072 | void bgp_maxmed_update(struct bgp *bgp) |
abc920f8 | 1073 | { |
d7c0a89a QY |
1074 | uint8_t maxmed_active; |
1075 | uint32_t maxmed_value; | |
d62a17ae | 1076 | |
1077 | if (bgp->v_maxmed_admin) { | |
1078 | maxmed_active = 1; | |
1079 | maxmed_value = bgp->maxmed_admin_value; | |
1080 | } else if (bgp->t_maxmed_onstartup) { | |
1081 | maxmed_active = 1; | |
1082 | maxmed_value = bgp->maxmed_onstartup_value; | |
1083 | } else { | |
1084 | maxmed_active = 0; | |
1085 | maxmed_value = BGP_MAXMED_VALUE_DEFAULT; | |
1086 | } | |
1087 | ||
1088 | if (bgp->maxmed_active != maxmed_active | |
1089 | || bgp->maxmed_value != maxmed_value) { | |
1090 | bgp->maxmed_active = maxmed_active; | |
1091 | bgp->maxmed_value = maxmed_value; | |
1092 | ||
1093 | update_group_announce(bgp); | |
1094 | } | |
abc920f8 DS |
1095 | } |
1096 | ||
3893aeee DA |
1097 | int bgp_fsm_error_subcode(int status) |
1098 | { | |
1099 | int fsm_err_subcode = BGP_NOTIFY_FSM_ERR_SUBCODE_UNSPECIFIC; | |
1100 | ||
1101 | switch (status) { | |
1102 | case OpenSent: | |
1103 | fsm_err_subcode = BGP_NOTIFY_FSM_ERR_SUBCODE_OPENSENT; | |
1104 | break; | |
1105 | case OpenConfirm: | |
1106 | fsm_err_subcode = BGP_NOTIFY_FSM_ERR_SUBCODE_OPENCONFIRM; | |
1107 | break; | |
1108 | case Established: | |
1109 | fsm_err_subcode = BGP_NOTIFY_FSM_ERR_SUBCODE_ESTABLISHED; | |
1110 | break; | |
1111 | default: | |
1112 | break; | |
1113 | } | |
1114 | ||
1115 | return fsm_err_subcode; | |
1116 | } | |
1117 | ||
abc920f8 | 1118 | /* The maxmed onstartup timer expiry callback. */ |
cc9f21da | 1119 | static void bgp_maxmed_onstartup_timer(struct thread *thread) |
abc920f8 | 1120 | { |
d62a17ae | 1121 | struct bgp *bgp; |
abc920f8 | 1122 | |
d62a17ae | 1123 | zlog_info("Max med on startup ended - timer expired."); |
abc920f8 | 1124 | |
d62a17ae | 1125 | bgp = THREAD_ARG(thread); |
50478845 | 1126 | THREAD_OFF(bgp->t_maxmed_onstartup); |
d62a17ae | 1127 | bgp->maxmed_onstartup_over = 1; |
abc920f8 | 1128 | |
d62a17ae | 1129 | bgp_maxmed_update(bgp); |
abc920f8 DS |
1130 | } |
1131 | ||
d62a17ae | 1132 | static void bgp_maxmed_onstartup_begin(struct bgp *bgp) |
abc920f8 | 1133 | { |
d62a17ae | 1134 | /* Applicable only once in the process lifetime on the startup */ |
1135 | if (bgp->maxmed_onstartup_over) | |
1136 | return; | |
abc920f8 | 1137 | |
d62a17ae | 1138 | zlog_info("Begin maxmed onstartup mode - timer %d seconds", |
1139 | bgp->v_maxmed_onstartup); | |
abc920f8 | 1140 | |
d62a17ae | 1141 | thread_add_timer(bm->master, bgp_maxmed_onstartup_timer, bgp, |
1142 | bgp->v_maxmed_onstartup, &bgp->t_maxmed_onstartup); | |
abc920f8 | 1143 | |
d62a17ae | 1144 | if (!bgp->v_maxmed_admin) { |
1145 | bgp->maxmed_active = 1; | |
1146 | bgp->maxmed_value = bgp->maxmed_onstartup_value; | |
1147 | } | |
abc920f8 | 1148 | |
d62a17ae | 1149 | /* Route announce to all peers should happen after this in |
1150 | * bgp_establish() */ | |
abc920f8 DS |
1151 | } |
1152 | ||
d62a17ae | 1153 | static void bgp_maxmed_onstartup_process_status_change(struct peer *peer) |
abc920f8 | 1154 | { |
feb17238 | 1155 | if (peer_established(peer) && !peer->bgp->established) { |
d62a17ae | 1156 | bgp_maxmed_onstartup_begin(peer->bgp); |
1157 | } | |
abc920f8 DS |
1158 | } |
1159 | ||
f188f2c4 | 1160 | /* The update delay timer expiry callback. */ |
cc9f21da | 1161 | static void bgp_update_delay_timer(struct thread *thread) |
f188f2c4 | 1162 | { |
d62a17ae | 1163 | struct bgp *bgp; |
f188f2c4 | 1164 | |
d62a17ae | 1165 | zlog_info("Update delay ended - timer expired."); |
f188f2c4 | 1166 | |
d62a17ae | 1167 | bgp = THREAD_ARG(thread); |
50478845 | 1168 | THREAD_OFF(bgp->t_update_delay); |
d62a17ae | 1169 | bgp_update_delay_end(bgp); |
f188f2c4 DS |
1170 | } |
1171 | ||
1172 | /* The establish wait timer expiry callback. */ | |
cc9f21da | 1173 | static void bgp_establish_wait_timer(struct thread *thread) |
f188f2c4 | 1174 | { |
d62a17ae | 1175 | struct bgp *bgp; |
f188f2c4 | 1176 | |
d62a17ae | 1177 | zlog_info("Establish wait - timer expired."); |
f188f2c4 | 1178 | |
d62a17ae | 1179 | bgp = THREAD_ARG(thread); |
50478845 | 1180 | THREAD_OFF(bgp->t_establish_wait); |
d62a17ae | 1181 | bgp_check_update_delay(bgp); |
f188f2c4 DS |
1182 | } |
1183 | ||
1184 | /* Steps to begin the update delay: | |
1185 | - initialize queues if needed | |
1186 | - stop the queue processing | |
1187 | - start the timer */ | |
d62a17ae | 1188 | static void bgp_update_delay_begin(struct bgp *bgp) |
f188f2c4 | 1189 | { |
d62a17ae | 1190 | struct listnode *node, *nnode; |
1191 | struct peer *peer; | |
f188f2c4 | 1192 | |
d62a17ae | 1193 | /* Stop the processing of queued work. Enqueue shall continue */ |
b6c386bb | 1194 | work_queue_plug(bgp->process_queue); |
f188f2c4 | 1195 | |
d62a17ae | 1196 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) |
1197 | peer->update_delay_over = 0; | |
f188f2c4 | 1198 | |
d62a17ae | 1199 | /* Start the update-delay timer */ |
1200 | thread_add_timer(bm->master, bgp_update_delay_timer, bgp, | |
1201 | bgp->v_update_delay, &bgp->t_update_delay); | |
f188f2c4 | 1202 | |
d62a17ae | 1203 | if (bgp->v_establish_wait != bgp->v_update_delay) |
1204 | thread_add_timer(bm->master, bgp_establish_wait_timer, bgp, | |
1205 | bgp->v_establish_wait, &bgp->t_establish_wait); | |
f188f2c4 | 1206 | |
e36f61b5 DS |
1207 | frr_timestamp(3, bgp->update_delay_begin_time, |
1208 | sizeof(bgp->update_delay_begin_time)); | |
f188f2c4 DS |
1209 | } |
1210 | ||
d62a17ae | 1211 | static void bgp_update_delay_process_status_change(struct peer *peer) |
f188f2c4 | 1212 | { |
feb17238 | 1213 | if (peer_established(peer)) { |
d62a17ae | 1214 | if (!peer->bgp->established++) { |
1215 | bgp_update_delay_begin(peer->bgp); | |
1216 | zlog_info( | |
1217 | "Begin read-only mode - update-delay timer %d seconds", | |
1218 | peer->bgp->v_update_delay); | |
1219 | } | |
1220 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_BIT_RCV)) | |
1221 | bgp_update_restarted_peers(peer); | |
1222 | } | |
1223 | if (peer->ostatus == Established | |
1224 | && bgp_update_delay_active(peer->bgp)) { | |
1225 | /* Adjust the update-delay state to account for this flap. | |
1226 | NOTE: Intentionally skipping adjusting implicit_eors or | |
1227 | explicit_eors | |
1228 | counters. Extra sanity check in bgp_check_update_delay() | |
1229 | should | |
1230 | be enough to take care of any additive discrepancy in bgp eor | |
1231 | counters */ | |
1232 | peer->bgp->established--; | |
1233 | peer->update_delay_over = 0; | |
1234 | } | |
f188f2c4 DS |
1235 | } |
1236 | ||
0437e105 | 1237 | /* Called after event occurred, this function change status and reset |
200df115 | 1238 | read/write and timer thread. */ |
d62a17ae | 1239 | void bgp_fsm_change_status(struct peer *peer, int status) |
200df115 | 1240 | { |
36dc7588 | 1241 | struct bgp *bgp; |
1242 | uint32_t peer_count; | |
1ff9a340 | 1243 | |
36dc7588 | 1244 | bgp = peer->bgp; |
1245 | peer_count = bgp->established_peers; | |
1246 | ||
1247 | if (status == Established) | |
1248 | bgp->established_peers++; | |
feb17238 | 1249 | else if ((peer_established(peer)) && (status != Established)) |
36dc7588 | 1250 | bgp->established_peers--; |
1251 | ||
1cfe005d DS |
1252 | if (bgp_debug_neighbor_events(peer)) { |
1253 | struct vrf *vrf = vrf_lookup_by_id(bgp->vrf_id); | |
1254 | ||
1255 | zlog_debug("%s : vrf %s(%u), Status: %s established_peers %u", __func__, | |
1256 | vrf ? vrf->name : "Unknown", bgp->vrf_id, | |
1257 | lookup_msg(bgp_status_msg, status, NULL), | |
1258 | bgp->established_peers); | |
1259 | } | |
1260 | ||
36dc7588 | 1261 | /* Set to router ID to the value provided by RIB if there are no peers |
1262 | * in the established state and peer count did not change | |
1263 | */ | |
1264 | if ((peer_count != bgp->established_peers) && | |
1265 | (bgp->established_peers == 0)) | |
1266 | bgp_router_id_zebra_bump(bgp->vrf_id, NULL); | |
1267 | ||
d62a17ae | 1268 | /* Transition into Clearing or Deleted must /always/ clear all routes.. |
1269 | * (and must do so before actually changing into Deleted.. | |
1270 | */ | |
1271 | if (status >= Clearing) { | |
1272 | bgp_clear_route_all(peer); | |
1273 | ||
1274 | /* If no route was queued for the clear-node processing, | |
1275 | * generate the | |
1276 | * completion event here. This is needed because if there are no | |
1277 | * routes | |
1278 | * to trigger the background clear-node thread, the event won't | |
1279 | * get | |
1280 | * generated and the peer would be stuck in Clearing. Note that | |
1281 | * this | |
1282 | * event is for the peer and helps the peer transition out of | |
1283 | * Clearing | |
1284 | * state; it should not be generated per (AFI,SAFI). The event | |
1285 | * is | |
1286 | * directly posted here without calling clear_node_complete() as | |
1287 | * we | |
1288 | * shouldn't do an extra unlock. This event will get processed | |
1289 | * after | |
1290 | * the state change that happens below, so peer will be in | |
1291 | * Clearing | |
1292 | * (or Deleted). | |
1293 | */ | |
1294 | if (!work_queue_is_scheduled(peer->clear_node_queue)) | |
1295 | BGP_EVENT_ADD(peer, Clearing_Completed); | |
1296 | } | |
1297 | ||
1298 | /* Preserve old status and change into new status. */ | |
1299 | peer->ostatus = peer->status; | |
1300 | peer->status = status; | |
1301 | ||
8336c896 DA |
1302 | /* Reset received keepalives counter on every FSM change */ |
1303 | peer->rtt_keepalive_rcv = 0; | |
1304 | ||
05e68acc BC |
1305 | /* Fire backward transition hook if that's the case */ |
1306 | if (peer->ostatus > peer->status) | |
1307 | hook_call(peer_backward_transition, peer); | |
1308 | ||
d62a17ae | 1309 | /* Save event that caused status change. */ |
1310 | peer->last_major_event = peer->cur_event; | |
1311 | ||
7d8d0eab MKS |
1312 | /* Operations after status change */ |
1313 | hook_call(peer_status_changed, peer); | |
1314 | ||
d62a17ae | 1315 | if (status == Established) |
1316 | UNSET_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER); | |
1317 | ||
1318 | /* If max-med processing is applicable, do the necessary. */ | |
1319 | if (status == Established) { | |
1320 | if (bgp_maxmed_onstartup_configured(peer->bgp) | |
1321 | && bgp_maxmed_onstartup_applicable(peer->bgp)) | |
1322 | bgp_maxmed_onstartup_process_status_change(peer); | |
1323 | else | |
1324 | peer->bgp->maxmed_onstartup_over = 1; | |
1325 | } | |
1326 | ||
1327 | /* If update-delay processing is applicable, do the necessary. */ | |
1328 | if (bgp_update_delay_configured(peer->bgp) | |
1329 | && bgp_update_delay_applicable(peer->bgp)) | |
1330 | bgp_update_delay_process_status_change(peer); | |
1331 | ||
1332 | if (bgp_debug_neighbor_events(peer)) | |
1333 | zlog_debug("%s went from %s to %s", peer->host, | |
1334 | lookup_msg(bgp_status_msg, peer->ostatus, NULL), | |
1335 | lookup_msg(bgp_status_msg, peer->status, NULL)); | |
200df115 | 1336 | } |
1337 | ||
3117b5c4 | 1338 | /* Flush the event queue and ensure the peer is shut down */ |
d62a17ae | 1339 | static int bgp_clearing_completed(struct peer *peer) |
3117b5c4 | 1340 | { |
d62a17ae | 1341 | int rc = bgp_stop(peer); |
1ff9a340 | 1342 | |
d62a17ae | 1343 | if (rc >= 0) |
1344 | BGP_EVENT_FLUSH(peer); | |
3117b5c4 | 1345 | |
d62a17ae | 1346 | return rc; |
3117b5c4 SH |
1347 | } |
1348 | ||
718e3744 | 1349 | /* Administrative BGP peer stop event. */ |
3117b5c4 | 1350 | /* May be called multiple times for the same peer */ |
d62a17ae | 1351 | int bgp_stop(struct peer *peer) |
718e3744 | 1352 | { |
d62a17ae | 1353 | afi_t afi; |
1354 | safi_t safi; | |
1355 | char orf_name[BUFSIZ]; | |
1356 | int ret = 0; | |
f009ff26 | 1357 | struct bgp *bgp = peer->bgp; |
1358 | struct graceful_restart_info *gr_info = NULL; | |
d62a17ae | 1359 | |
2ba1fe69 | 1360 | peer->nsf_af_count = 0; |
1361 | ||
e7db872b | 1362 | /* deregister peer */ |
21bfce98 RZ |
1363 | if (peer->bfd_config |
1364 | && peer->last_reset == PEER_DOWN_UPDATE_SOURCE_CHANGE) | |
1365 | bfd_sess_uninstall(peer->bfd_config->session); | |
e7db872b | 1366 | |
af8496af DA |
1367 | if (peer_dynamic_neighbor_no_nsf(peer) && |
1368 | !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
d62a17ae | 1369 | if (bgp_debug_neighbor_events(peer)) |
31afff83 DA |
1370 | zlog_debug("%s (dynamic neighbor) deleted (%s)", |
1371 | peer->host, __func__); | |
d62a17ae | 1372 | peer_delete(peer); |
1373 | return -1; | |
c22767d8 | 1374 | } |
848973c7 | 1375 | |
d62a17ae | 1376 | /* Can't do this in Clearing; events are used for state transitions */ |
1377 | if (peer->status != Clearing) { | |
1378 | /* Delete all existing events of the peer */ | |
1379 | BGP_EVENT_FLUSH(peer); | |
93406d87 | 1380 | } |
d62a17ae | 1381 | |
1382 | /* Increment Dropped count. */ | |
feb17238 | 1383 | if (peer_established(peer)) { |
d62a17ae | 1384 | peer->dropped++; |
1385 | ||
1386 | /* bgp log-neighbor-changes of neighbor Down */ | |
892fedb6 DA |
1387 | if (CHECK_FLAG(peer->bgp->flags, |
1388 | BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { | |
d62a17ae | 1389 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); |
2986cac2 | 1390 | |
d62a17ae | 1391 | zlog_info( |
1392 | "%%ADJCHANGE: neighbor %s(%s) in vrf %s Down %s", | |
1393 | peer->host, | |
1394 | (peer->hostname) ? peer->hostname : "Unknown", | |
5742e42b DS |
1395 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) |
1396 | ? vrf->name | |
1397 | : VRF_DEFAULT_NAME) | |
d62a17ae | 1398 | : "", |
1399 | peer_down_str[(int)peer->last_reset]); | |
1400 | } | |
1401 | ||
1402 | /* graceful restart */ | |
1403 | if (peer->t_gr_stale) { | |
1404 | BGP_TIMER_OFF(peer->t_gr_stale); | |
1405 | if (bgp_debug_neighbor_events(peer)) | |
1406 | zlog_debug( | |
1407 | "%s graceful restart stalepath timer stopped", | |
1408 | peer->host); | |
1409 | } | |
1410 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
1411 | if (bgp_debug_neighbor_events(peer)) { | |
1412 | zlog_debug( | |
1413 | "%s graceful restart timer started for %d sec", | |
1414 | peer->host, peer->v_gr_restart); | |
1415 | zlog_debug( | |
1416 | "%s graceful restart stalepath timer started for %d sec", | |
1417 | peer->host, peer->bgp->stalepath_time); | |
1418 | } | |
1419 | BGP_TIMER_ON(peer->t_gr_restart, | |
1420 | bgp_graceful_restart_timer_expire, | |
1421 | peer->v_gr_restart); | |
1422 | BGP_TIMER_ON(peer->t_gr_stale, | |
1423 | bgp_graceful_stale_timer_expire, | |
1424 | peer->bgp->stalepath_time); | |
1425 | } else { | |
1426 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1427 | ||
df8d723c DA |
1428 | FOREACH_AFI_SAFI_NSF (afi, safi) |
1429 | peer->nsf[afi][safi] = 0; | |
d62a17ae | 1430 | } |
1431 | ||
9af52ccf DA |
1432 | /* Stop route-refresh stalepath timer */ |
1433 | if (peer->t_refresh_stalepath) { | |
1434 | BGP_TIMER_OFF(peer->t_refresh_stalepath); | |
1435 | ||
1436 | if (bgp_debug_neighbor_events(peer)) | |
1437 | zlog_debug( | |
1438 | "%s: route-refresh restart stalepath timer stopped", | |
1439 | peer->host); | |
1440 | } | |
1441 | ||
f009ff26 | 1442 | /* If peer reset before receiving EOR, decrement EOR count and |
1443 | * cancel the selection deferral timer if there are no | |
1444 | * pending EOR messages to be received | |
1445 | */ | |
1446 | if (BGP_PEER_GRACEFUL_RESTART_CAPABLE(peer)) { | |
1447 | FOREACH_AFI_SAFI (afi, safi) { | |
13909c4f DS |
1448 | if (!peer->afc_nego[afi][safi] |
1449 | || CHECK_FLAG(peer->af_sflags[afi][safi], | |
1450 | PEER_STATUS_EOR_RECEIVED)) | |
1451 | continue; | |
1452 | ||
1453 | gr_info = &bgp->gr_info[afi][safi]; | |
1454 | if (!gr_info) | |
1455 | continue; | |
1456 | ||
1457 | if (gr_info->eor_required) | |
1458 | gr_info->eor_required--; | |
1459 | ||
1460 | if (BGP_DEBUG(update, UPDATE_OUT)) | |
1461 | zlog_debug("peer %s, EOR_required %d", | |
1462 | peer->host, | |
1463 | gr_info->eor_required); | |
1464 | ||
1465 | /* There is no pending EOR message */ | |
1466 | if (gr_info->eor_required == 0) { | |
1467 | BGP_TIMER_OFF( | |
f009ff26 | 1468 | gr_info->t_select_deferral); |
13909c4f | 1469 | gr_info->eor_received = 0; |
f009ff26 | 1470 | } |
1471 | } | |
1472 | } | |
1473 | ||
d62a17ae | 1474 | /* set last reset time */ |
1475 | peer->resettime = peer->uptime = bgp_clock(); | |
1476 | ||
1477 | if (BGP_DEBUG(update_groups, UPDATE_GROUPS)) | |
1478 | zlog_debug("%s remove from all update group", | |
1479 | peer->host); | |
1480 | update_group_remove_peer_afs(peer); | |
1481 | ||
d62a17ae | 1482 | /* Reset peer synctime */ |
1483 | peer->synctime = 0; | |
93406d87 | 1484 | } |
93406d87 | 1485 | |
424ab01d | 1486 | /* stop keepalives */ |
b72b6f4f | 1487 | bgp_keepalives_off(peer); |
424ab01d QY |
1488 | |
1489 | /* Stop read and write threads. */ | |
1490 | bgp_writes_off(peer); | |
1491 | bgp_reads_off(peer); | |
1492 | ||
387f984e QY |
1493 | THREAD_OFF(peer->t_connect_check_r); |
1494 | THREAD_OFF(peer->t_connect_check_w); | |
d62a17ae | 1495 | |
1496 | /* Stop all timers. */ | |
1497 | BGP_TIMER_OFF(peer->t_start); | |
1498 | BGP_TIMER_OFF(peer->t_connect); | |
1499 | BGP_TIMER_OFF(peer->t_holdtime); | |
d62a17ae | 1500 | BGP_TIMER_OFF(peer->t_routeadv); |
6c537a18 | 1501 | BGP_TIMER_OFF(peer->t_delayopen); |
d62a17ae | 1502 | |
1503 | /* Clear input and output buffer. */ | |
00dffa8c | 1504 | frr_with_mutex(&peer->io_mtx) { |
424ab01d QY |
1505 | if (peer->ibuf) |
1506 | stream_fifo_clean(peer->ibuf); | |
d3ecc69e QY |
1507 | if (peer->obuf) |
1508 | stream_fifo_clean(peer->obuf); | |
424ab01d QY |
1509 | |
1510 | if (peer->ibuf_work) | |
74ffbfe6 | 1511 | ringbuf_wipe(peer->ibuf_work); |
424ab01d QY |
1512 | if (peer->obuf_work) |
1513 | stream_reset(peer->obuf_work); | |
1514 | ||
1515 | if (peer->curr) { | |
1516 | stream_free(peer->curr); | |
1517 | peer->curr = NULL; | |
1518 | } | |
d3ecc69e | 1519 | } |
d62a17ae | 1520 | |
1521 | /* Close of file descriptor. */ | |
1522 | if (peer->fd >= 0) { | |
1523 | close(peer->fd); | |
1524 | peer->fd = -1; | |
93406d87 | 1525 | } |
1526 | ||
24f569e9 AS |
1527 | /* Reset capabilities. */ |
1528 | peer->cap = 0; | |
1529 | ||
05c7a1cc QY |
1530 | FOREACH_AFI_SAFI (afi, safi) { |
1531 | /* Reset all negotiated variables */ | |
1532 | peer->afc_nego[afi][safi] = 0; | |
1533 | peer->afc_adv[afi][safi] = 0; | |
1534 | peer->afc_recv[afi][safi] = 0; | |
1535 | ||
1536 | /* peer address family capability flags*/ | |
1537 | peer->af_cap[afi][safi] = 0; | |
1538 | ||
1539 | /* peer address family status flags*/ | |
1540 | peer->af_sflags[afi][safi] = 0; | |
1541 | ||
1542 | /* Received ORF prefix-filter */ | |
1543 | peer->orf_plist[afi][safi] = NULL; | |
1544 | ||
feb17238 | 1545 | if ((peer->status == OpenConfirm) || (peer_established(peer))) { |
05c7a1cc | 1546 | /* ORF received prefix-filter pnt */ |
fc746f1c QY |
1547 | snprintf(orf_name, sizeof(orf_name), "%s.%d.%d", |
1548 | peer->host, afi, safi); | |
05c7a1cc | 1549 | prefix_bgp_orf_remove_all(afi, orf_name); |
d62a17ae | 1550 | } |
05c7a1cc | 1551 | } |
d62a17ae | 1552 | |
1553 | /* Reset keepalive and holdtime */ | |
b90a8e13 | 1554 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER)) { |
d62a17ae | 1555 | peer->v_keepalive = peer->keepalive; |
1556 | peer->v_holdtime = peer->holdtime; | |
1557 | } else { | |
1558 | peer->v_keepalive = peer->bgp->default_keepalive; | |
1559 | peer->v_holdtime = peer->bgp->default_holdtime; | |
1ff9a340 | 1560 | } |
d62a17ae | 1561 | |
6c537a18 DS |
1562 | /* Reset DelayOpenTime */ |
1563 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER_DELAYOPEN)) | |
1564 | peer->v_delayopen = peer->delayopen; | |
1565 | else | |
1566 | peer->v_delayopen = peer->bgp->default_delayopen; | |
1567 | ||
d62a17ae | 1568 | peer->update_time = 0; |
1569 | ||
d62a17ae | 1570 | if (!CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE) |
1571 | && !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
1572 | peer_delete(peer); | |
1573 | ret = -1; | |
1574 | } else { | |
1575 | bgp_peer_conf_if_to_su_update(peer); | |
1576 | } | |
d62a17ae | 1577 | return ret; |
718e3744 | 1578 | } |
1579 | ||
1580 | /* BGP peer is stoped by the error. */ | |
d62a17ae | 1581 | static int bgp_stop_with_error(struct peer *peer) |
718e3744 | 1582 | { |
d62a17ae | 1583 | /* Double start timer. */ |
1584 | peer->v_start *= 2; | |
1585 | ||
1586 | /* Overflow check. */ | |
1587 | if (peer->v_start >= (60 * 2)) | |
1588 | peer->v_start = (60 * 2); | |
1589 | ||
af8496af | 1590 | if (peer_dynamic_neighbor_no_nsf(peer)) { |
d62a17ae | 1591 | if (bgp_debug_neighbor_events(peer)) |
31afff83 DA |
1592 | zlog_debug("%s (dynamic neighbor) deleted (%s)", |
1593 | peer->host, __func__); | |
d62a17ae | 1594 | peer_delete(peer); |
1595 | return -1; | |
1596 | } | |
1597 | ||
1598 | return (bgp_stop(peer)); | |
718e3744 | 1599 | } |
1600 | ||
397b5bde LR |
1601 | |
1602 | /* something went wrong, send notify and tear down */ | |
d7c0a89a QY |
1603 | static int bgp_stop_with_notify(struct peer *peer, uint8_t code, |
1604 | uint8_t sub_code) | |
397b5bde | 1605 | { |
d62a17ae | 1606 | /* Send notify to remote peer */ |
1607 | bgp_notify_send(peer, code, sub_code); | |
1608 | ||
af8496af | 1609 | if (peer_dynamic_neighbor_no_nsf(peer)) { |
d62a17ae | 1610 | if (bgp_debug_neighbor_events(peer)) |
31afff83 DA |
1611 | zlog_debug("%s (dynamic neighbor) deleted (%s)", |
1612 | peer->host, __func__); | |
d62a17ae | 1613 | peer_delete(peer); |
1614 | return -1; | |
1615 | } | |
f14e6fdb | 1616 | |
d62a17ae | 1617 | /* Clear start timer value to default. */ |
1618 | peer->v_start = BGP_INIT_START_TIMER; | |
397b5bde | 1619 | |
d62a17ae | 1620 | return (bgp_stop(peer)); |
397b5bde LR |
1621 | } |
1622 | ||
07a16526 QY |
1623 | /** |
1624 | * Determines whether a TCP session has successfully established for a peer and | |
1625 | * events as appropriate. | |
1626 | * | |
1627 | * This function is called when setting up a new session. After connect() is | |
387f984e QY |
1628 | * called on the peer's socket (in bgp_start()), the fd is passed to poll() |
1629 | * to wait for connection success or failure. When poll() returns, this | |
07a16526 | 1630 | * function is called to evaluate the result. |
387f984e QY |
1631 | * |
1632 | * Due to differences in behavior of poll() on Linux and BSD - specifically, | |
1633 | * the value of .revents in the case of a closed connection - this function is | |
1634 | * scheduled both for a read and a write event. The write event is triggered | |
1635 | * when the connection is established. A read event is triggered when the | |
1636 | * connection is closed. Thus we need to cancel whichever one did not occur. | |
07a16526 | 1637 | */ |
cc9f21da | 1638 | static void bgp_connect_check(struct thread *thread) |
07a16526 QY |
1639 | { |
1640 | int status; | |
1641 | socklen_t slen; | |
1642 | int ret; | |
1643 | struct peer *peer; | |
1644 | ||
1645 | peer = THREAD_ARG(thread); | |
424ab01d QY |
1646 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); |
1647 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); | |
1648 | assert(!peer->t_read); | |
1649 | assert(!peer->t_write); | |
07a16526 | 1650 | |
387f984e QY |
1651 | THREAD_OFF(peer->t_connect_check_r); |
1652 | THREAD_OFF(peer->t_connect_check_w); | |
dc1188bb | 1653 | |
07a16526 QY |
1654 | /* Check file descriptor. */ |
1655 | slen = sizeof(status); | |
1656 | ret = getsockopt(peer->fd, SOL_SOCKET, SO_ERROR, (void *)&status, | |
1657 | &slen); | |
1658 | ||
1659 | /* If getsockopt is fail, this is fatal error. */ | |
1660 | if (ret < 0) { | |
4cb5e18b | 1661 | zlog_err("can't get sockopt for nonblocking connect: %d(%s)", |
54ff5e9b | 1662 | errno, safe_strerror(errno)); |
07a16526 | 1663 | BGP_EVENT_ADD(peer, TCP_fatal_error); |
cc9f21da | 1664 | return; |
07a16526 QY |
1665 | } |
1666 | ||
1667 | /* When status is 0 then TCP connection is established. */ | |
1668 | if (status == 0) { | |
6c537a18 DS |
1669 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER_DELAYOPEN)) |
1670 | BGP_EVENT_ADD(peer, TCP_connection_open_w_delay); | |
1671 | else | |
1672 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
cc9f21da | 1673 | return; |
07a16526 QY |
1674 | } else { |
1675 | if (bgp_debug_neighbor_events(peer)) | |
54ff5e9b DS |
1676 | zlog_debug("%s [Event] Connect failed %d(%s)", |
1677 | peer->host, status, safe_strerror(status)); | |
07a16526 | 1678 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); |
cc9f21da | 1679 | return; |
07a16526 QY |
1680 | } |
1681 | } | |
397b5bde | 1682 | |
718e3744 | 1683 | /* TCP connection open. Next we send open message to remote peer. And |
1684 | add read thread for reading open message. */ | |
d62a17ae | 1685 | static int bgp_connect_success(struct peer *peer) |
718e3744 | 1686 | { |
d62a17ae | 1687 | if (peer->fd < 0) { |
e50f7cfd | 1688 | flog_err(EC_BGP_CONNECT, |
1c50c1c0 QY |
1689 | "bgp_connect_success peer's fd is negative value %d", |
1690 | peer->fd); | |
d62a17ae | 1691 | bgp_stop(peer); |
1692 | return -1; | |
1693 | } | |
1694 | ||
1695 | if (bgp_getsockname(peer) < 0) { | |
450971aa | 1696 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 | 1697 | "%s: bgp_getsockname(): failed for peer %s, fd %d", |
15569c58 | 1698 | __func__, peer->host, peer->fd); |
3893aeee DA |
1699 | bgp_notify_send(peer, BGP_NOTIFY_FSM_ERR, |
1700 | bgp_fsm_error_subcode(peer->status)); | |
424ab01d | 1701 | bgp_writes_on(peer); |
d62a17ae | 1702 | return -1; |
1703 | } | |
1704 | ||
424ab01d | 1705 | bgp_reads_on(peer); |
d62a17ae | 1706 | |
1707 | if (bgp_debug_neighbor_events(peer)) { | |
d62a17ae | 1708 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
c0d72166 DS |
1709 | zlog_debug("%s open active, local address %pSU", |
1710 | peer->host, peer->su_local); | |
d62a17ae | 1711 | else |
1712 | zlog_debug("%s passive open", peer->host); | |
1713 | } | |
1714 | ||
6c537a18 | 1715 | /* Send an open message */ |
d62a17ae | 1716 | bgp_open_send(peer); |
1717 | ||
1718 | return 0; | |
718e3744 | 1719 | } |
1720 | ||
6c537a18 DS |
1721 | /* TCP connection open with RFC 4271 optional session attribute DelayOpen flag |
1722 | * set. | |
1723 | */ | |
1724 | static int bgp_connect_success_w_delayopen(struct peer *peer) | |
1725 | { | |
1726 | if (peer->fd < 0) { | |
1727 | flog_err(EC_BGP_CONNECT, "%s: peer's fd is negative value %d", | |
1728 | __func__, peer->fd); | |
1729 | bgp_stop(peer); | |
1730 | return -1; | |
1731 | } | |
1732 | ||
1733 | if (bgp_getsockname(peer) < 0) { | |
1734 | flog_err_sys(EC_LIB_SOCKET, | |
1735 | "%s: bgp_getsockname(): failed for peer %s, fd %d", | |
1736 | __func__, peer->host, peer->fd); | |
1737 | bgp_notify_send(peer, BGP_NOTIFY_FSM_ERR, | |
1738 | bgp_fsm_error_subcode(peer->status)); | |
1739 | bgp_writes_on(peer); | |
1740 | return -1; | |
1741 | } | |
1742 | ||
1743 | bgp_reads_on(peer); | |
1744 | ||
1745 | if (bgp_debug_neighbor_events(peer)) { | |
6c537a18 | 1746 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
c0d72166 DS |
1747 | zlog_debug("%s open active, local address %pSU", |
1748 | peer->host, peer->su_local); | |
6c537a18 DS |
1749 | else |
1750 | zlog_debug("%s passive open", peer->host); | |
1751 | } | |
1752 | ||
1753 | /* set the DelayOpenTime to the inital value */ | |
1754 | peer->v_delayopen = peer->delayopen; | |
1755 | ||
1756 | /* Start the DelayOpenTimer if it is not already running */ | |
1757 | if (!peer->t_delayopen) | |
1758 | BGP_TIMER_ON(peer->t_delayopen, bgp_delayopen_timer, | |
1759 | peer->v_delayopen); | |
1760 | ||
1761 | if (bgp_debug_neighbor_events(peer)) | |
1762 | zlog_debug("%s [FSM] BGP OPEN message delayed for %d seconds", | |
1763 | peer->host, peer->delayopen); | |
1764 | ||
1765 | return 0; | |
1766 | } | |
1767 | ||
718e3744 | 1768 | /* TCP connect fail */ |
d62a17ae | 1769 | static int bgp_connect_fail(struct peer *peer) |
718e3744 | 1770 | { |
af8496af | 1771 | if (peer_dynamic_neighbor_no_nsf(peer)) { |
d62a17ae | 1772 | if (bgp_debug_neighbor_events(peer)) |
31afff83 DA |
1773 | zlog_debug("%s (dynamic neighbor) deleted (%s)", |
1774 | peer->host, __func__); | |
d62a17ae | 1775 | peer_delete(peer); |
1776 | return -1; | |
1777 | } | |
1778 | ||
8761cd6d DS |
1779 | /* |
1780 | * If we are doing nht for a peer that ls v6 LL based | |
1781 | * massage the event system to make things happy | |
1782 | */ | |
1783 | bgp_nht_interface_events(peer); | |
1784 | ||
d62a17ae | 1785 | return (bgp_stop(peer)); |
718e3744 | 1786 | } |
1787 | ||
1788 | /* This function is the first starting point of all BGP connection. It | |
6c537a18 DS |
1789 | * try to connect to remote peer with non-blocking IO. |
1790 | */ | |
d62a17ae | 1791 | int bgp_start(struct peer *peer) |
718e3744 | 1792 | { |
d62a17ae | 1793 | int status; |
d62a17ae | 1794 | |
1795 | bgp_peer_conf_if_to_su_update(peer); | |
1796 | ||
1797 | if (peer->su.sa.sa_family == AF_UNSPEC) { | |
1798 | if (bgp_debug_neighbor_events(peer)) | |
1799 | zlog_debug( | |
1800 | "%s [FSM] Unable to get neighbor's IP address, waiting...", | |
1801 | peer->host); | |
3577f1c5 | 1802 | peer->last_reset = PEER_DOWN_NBR_ADDR; |
d62a17ae | 1803 | return -1; |
1804 | } | |
1805 | ||
1806 | if (BGP_PEER_START_SUPPRESSED(peer)) { | |
1807 | if (bgp_debug_neighbor_events(peer)) | |
e50f7cfd | 1808 | flog_err(EC_BGP_FSM, |
3efd0893 | 1809 | "%s [FSM] Trying to start suppressed peer - this is never supposed to happen!", |
1c50c1c0 | 1810 | peer->host); |
07d1e5d9 DA |
1811 | if (CHECK_FLAG(peer->flags, PEER_FLAG_SHUTDOWN)) |
1812 | peer->last_reset = PEER_DOWN_USER_SHUTDOWN; | |
cb9196e7 DS |
1813 | else if (CHECK_FLAG(peer->bgp->flags, BGP_FLAG_SHUTDOWN)) |
1814 | peer->last_reset = PEER_DOWN_USER_SHUTDOWN; | |
07d1e5d9 DA |
1815 | else if (CHECK_FLAG(peer->sflags, PEER_STATUS_PREFIX_OVERFLOW)) |
1816 | peer->last_reset = PEER_DOWN_PFX_COUNT; | |
d62a17ae | 1817 | return -1; |
1818 | } | |
1819 | ||
1820 | /* Scrub some information that might be left over from a previous, | |
1821 | * session | |
1822 | */ | |
1823 | /* Connection information. */ | |
1824 | if (peer->su_local) { | |
1825 | sockunion_free(peer->su_local); | |
1826 | peer->su_local = NULL; | |
1827 | } | |
1828 | ||
1829 | if (peer->su_remote) { | |
1830 | sockunion_free(peer->su_remote); | |
1831 | peer->su_remote = NULL; | |
1832 | } | |
1833 | ||
1834 | /* Clear remote router-id. */ | |
975a328e | 1835 | peer->remote_id.s_addr = INADDR_ANY; |
d62a17ae | 1836 | |
1837 | /* Clear peer capability flag. */ | |
1838 | peer->cap = 0; | |
1839 | ||
1840 | /* If the peer is passive mode, force to move to Active mode. */ | |
1841 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE)) { | |
1842 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1843 | return 0; | |
1844 | } | |
1845 | ||
2c1eba8e | 1846 | if (peer->bgp->vrf_id == VRF_UNKNOWN) { |
61cf4b37 | 1847 | if (bgp_debug_neighbor_events(peer)) |
af4c2728 | 1848 | flog_err( |
e50f7cfd | 1849 | EC_BGP_FSM, |
996c9314 LB |
1850 | "%s [FSM] In a VRF that is not initialised yet", |
1851 | peer->host); | |
3577f1c5 | 1852 | peer->last_reset = PEER_DOWN_VRF_UNINIT; |
61cf4b37 PG |
1853 | return -1; |
1854 | } | |
1855 | ||
e2d3a909 | 1856 | /* Register peer for NHT. If next hop is already resolved, proceed |
1857 | * with connection setup, else wait. | |
1858 | */ | |
1859 | if (!bgp_peer_reg_with_nht(peer)) { | |
c42eab4b DS |
1860 | if (bgp_zebra_num_connects()) { |
1861 | if (bgp_debug_neighbor_events(peer)) | |
1862 | zlog_debug("%s [FSM] Waiting for NHT", | |
1863 | peer->host); | |
3577f1c5 | 1864 | peer->last_reset = PEER_DOWN_WAITING_NHT; |
c42eab4b DS |
1865 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); |
1866 | return 0; | |
1867 | } | |
718e3744 | 1868 | } |
d62a17ae | 1869 | |
424ab01d QY |
1870 | assert(!peer->t_write); |
1871 | assert(!peer->t_read); | |
1872 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); | |
1873 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); | |
d62a17ae | 1874 | status = bgp_connect(peer); |
1875 | ||
1876 | switch (status) { | |
1877 | case connect_error: | |
1878 | if (bgp_debug_neighbor_events(peer)) | |
1879 | zlog_debug("%s [FSM] Connect error", peer->host); | |
1880 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1881 | break; | |
1882 | case connect_success: | |
1883 | if (bgp_debug_neighbor_events(peer)) | |
1884 | zlog_debug( | |
1885 | "%s [FSM] Connect immediately success, fd %d", | |
1886 | peer->host, peer->fd); | |
6c537a18 | 1887 | |
d62a17ae | 1888 | BGP_EVENT_ADD(peer, TCP_connection_open); |
1889 | break; | |
1890 | case connect_in_progress: | |
1891 | /* To check nonblocking connect, we wait until socket is | |
1892 | readable or writable. */ | |
1893 | if (bgp_debug_neighbor_events(peer)) | |
1894 | zlog_debug( | |
1895 | "%s [FSM] Non blocking connect waiting result, fd %d", | |
1896 | peer->host, peer->fd); | |
1897 | if (peer->fd < 0) { | |
e50f7cfd | 1898 | flog_err(EC_BGP_FSM, |
1c50c1c0 QY |
1899 | "bgp_start peer's fd is negative value %d", |
1900 | peer->fd); | |
d62a17ae | 1901 | return -1; |
1902 | } | |
becedef6 | 1903 | /* |
387f984e QY |
1904 | * - when the socket becomes ready, poll() will signify POLLOUT |
1905 | * - if it fails to connect, poll() will signify POLLHUP | |
1906 | * - POLLHUP is handled as a 'read' event by thread.c | |
1907 | * | |
1908 | * therefore, we schedule both a read and a write event with | |
1909 | * bgp_connect_check() as the handler for each and cancel the | |
1910 | * unused event in that function. | |
becedef6 | 1911 | */ |
424ab01d | 1912 | thread_add_read(bm->master, bgp_connect_check, peer, peer->fd, |
387f984e QY |
1913 | &peer->t_connect_check_r); |
1914 | thread_add_write(bm->master, bgp_connect_check, peer, peer->fd, | |
1915 | &peer->t_connect_check_w); | |
d62a17ae | 1916 | break; |
1917 | } | |
1918 | return 0; | |
718e3744 | 1919 | } |
1920 | ||
1921 | /* Connect retry timer is expired when the peer status is Connect. */ | |
d62a17ae | 1922 | static int bgp_reconnect(struct peer *peer) |
718e3744 | 1923 | { |
d62a17ae | 1924 | if (bgp_stop(peer) < 0) |
1925 | return -1; | |
1ff9a340 | 1926 | |
8c48b3b6 | 1927 | /* Send graceful restart capabilty */ |
36235319 QY |
1928 | BGP_GR_ROUTER_DETECT_AND_SEND_CAPABILITY_TO_ZEBRA(peer->bgp, |
1929 | peer->bgp->peer); | |
8c48b3b6 | 1930 | |
d62a17ae | 1931 | bgp_start(peer); |
1932 | return 0; | |
718e3744 | 1933 | } |
1934 | ||
d62a17ae | 1935 | static int bgp_fsm_open(struct peer *peer) |
718e3744 | 1936 | { |
6c537a18 DS |
1937 | /* If DelayOpen is active, we may still need to send an open message */ |
1938 | if ((peer->status == Connect) || (peer->status == Active)) | |
1939 | bgp_open_send(peer); | |
1940 | ||
d62a17ae | 1941 | /* Send keepalive and make keepalive timer */ |
1942 | bgp_keepalive_send(peer); | |
718e3744 | 1943 | |
d62a17ae | 1944 | return 0; |
718e3744 | 1945 | } |
1946 | ||
397b5bde LR |
1947 | /* FSM error, unexpected event. This is error of BGP connection. So cut the |
1948 | peer and change to Idle status. */ | |
d62a17ae | 1949 | static int bgp_fsm_event_error(struct peer *peer) |
397b5bde | 1950 | { |
1c50c1c0 QY |
1951 | flog_err(EC_BGP_FSM, "%s [FSM] unexpected packet received in state %s", |
1952 | peer->host, lookup_msg(bgp_status_msg, peer->status, NULL)); | |
397b5bde | 1953 | |
3893aeee DA |
1954 | return bgp_stop_with_notify(peer, BGP_NOTIFY_FSM_ERR, |
1955 | bgp_fsm_error_subcode(peer->status)); | |
397b5bde LR |
1956 | } |
1957 | ||
718e3744 | 1958 | /* Hold timer expire. This is error of BGP connection. So cut the |
1959 | peer and change to Idle status. */ | |
d62a17ae | 1960 | static int bgp_fsm_holdtime_expire(struct peer *peer) |
718e3744 | 1961 | { |
d62a17ae | 1962 | if (bgp_debug_neighbor_events(peer)) |
1963 | zlog_debug("%s [FSM] Hold timer expire", peer->host); | |
718e3744 | 1964 | |
d62a17ae | 1965 | return bgp_stop_with_notify(peer, BGP_NOTIFY_HOLD_ERR, 0); |
718e3744 | 1966 | } |
1967 | ||
6c537a18 DS |
1968 | /* RFC 4271 DelayOpenTimer_Expires event */ |
1969 | static int bgp_fsm_delayopen_timer_expire(struct peer *peer) | |
1970 | { | |
1971 | /* Stop the DelayOpenTimer */ | |
1972 | BGP_TIMER_OFF(peer->t_delayopen); | |
1973 | ||
1974 | /* Send open message to peer */ | |
1975 | bgp_open_send(peer); | |
1976 | ||
1977 | /* Set the HoldTimer to a large value (4 minutes) */ | |
1978 | peer->v_holdtime = 245; | |
1979 | ||
1980 | return 0; | |
1981 | } | |
1982 | ||
f009ff26 | 1983 | /* Start the selection deferral timer thread for the specified AFI, SAFI */ |
1984 | static int bgp_start_deferral_timer(struct bgp *bgp, afi_t afi, safi_t safi, | |
36235319 | 1985 | struct graceful_restart_info *gr_info) |
f009ff26 | 1986 | { |
1987 | struct afi_safi_info *thread_info; | |
1988 | ||
1989 | /* If the deferral timer is active, then increment eor count */ | |
1990 | if (gr_info->t_select_deferral) { | |
1991 | gr_info->eor_required++; | |
1992 | return 0; | |
1993 | } | |
1994 | ||
1995 | /* Start the deferral timer when the first peer enabled for the graceful | |
1996 | * restart is established | |
1997 | */ | |
1998 | if (gr_info->eor_required == 0) { | |
1999 | thread_info = XMALLOC(MTYPE_TMP, sizeof(struct afi_safi_info)); | |
f009ff26 | 2000 | |
2001 | thread_info->afi = afi; | |
2002 | thread_info->safi = safi; | |
2003 | thread_info->bgp = bgp; | |
2004 | ||
13909c4f DS |
2005 | thread_add_timer(bm->master, bgp_graceful_deferral_timer_expire, |
2006 | thread_info, bgp->select_defer_time, | |
2007 | &gr_info->t_select_deferral); | |
f009ff26 | 2008 | } |
f009ff26 | 2009 | gr_info->eor_required++; |
8c48b3b6 | 2010 | /* Send message to RIB indicating route update pending */ |
2011 | if (gr_info->af_enabled[afi][safi] == false) { | |
2012 | gr_info->af_enabled[afi][safi] = true; | |
2013 | /* Send message to RIB */ | |
2014 | bgp_zebra_update(afi, safi, bgp->vrf_id, | |
2015 | ZEBRA_CLIENT_ROUTE_UPDATE_PENDING); | |
2016 | } | |
f009ff26 | 2017 | if (BGP_DEBUG(update, UPDATE_OUT)) |
2018 | zlog_debug("Started the deferral timer for %s eor_required %d", | |
36235319 QY |
2019 | get_afi_safi_str(afi, safi, false), |
2020 | gr_info->eor_required); | |
f009ff26 | 2021 | return 0; |
2022 | } | |
2023 | ||
2024 | /* Update the graceful restart information for the specified AFI, SAFI */ | |
2025 | static int bgp_update_gr_info(struct peer *peer, afi_t afi, safi_t safi) | |
2026 | { | |
2027 | struct graceful_restart_info *gr_info; | |
2028 | struct bgp *bgp = peer->bgp; | |
2029 | int ret = 0; | |
2030 | ||
2031 | if ((afi < AFI_IP) || (afi >= AFI_MAX)) { | |
2032 | if (BGP_DEBUG(update, UPDATE_OUT)) | |
2033 | zlog_debug("%s : invalid afi %d", __func__, afi); | |
2034 | return -1; | |
2035 | } | |
2036 | ||
2037 | if ((safi < SAFI_UNICAST) || (safi > SAFI_MPLS_VPN)) { | |
2038 | if (BGP_DEBUG(update, UPDATE_OUT)) | |
2039 | zlog_debug("%s : invalid safi %d", __func__, safi); | |
2040 | return -1; | |
2041 | } | |
2042 | ||
2043 | /* Restarting router */ | |
36235319 QY |
2044 | if (BGP_PEER_GRACEFUL_RESTART_CAPABLE(peer) |
2045 | && BGP_PEER_RESTARTING_MODE(peer)) { | |
f009ff26 | 2046 | /* Check if the forwarding state is preserved */ |
892fedb6 | 2047 | if (CHECK_FLAG(bgp->flags, BGP_FLAG_GR_PRESERVE_FWD)) { |
f009ff26 | 2048 | gr_info = &(bgp->gr_info[afi][safi]); |
2049 | ret = bgp_start_deferral_timer(bgp, afi, safi, gr_info); | |
2050 | } | |
2051 | } | |
2ba1fe69 | 2052 | return ret; |
f009ff26 | 2053 | } |
2054 | ||
727c4f87 QY |
2055 | /** |
2056 | * Transition to Established state. | |
2057 | * | |
2058 | * Convert peer from stub to full fledged peer, set some timers, and generate | |
2059 | * initial updates. | |
2060 | */ | |
d62a17ae | 2061 | static int bgp_establish(struct peer *peer) |
718e3744 | 2062 | { |
d62a17ae | 2063 | afi_t afi; |
2064 | safi_t safi; | |
2065 | int nsf_af_count = 0; | |
2066 | int ret = 0; | |
2067 | struct peer *other; | |
f009ff26 | 2068 | int status; |
d62a17ae | 2069 | |
2070 | other = peer->doppelganger; | |
2071 | peer = peer_xfer_conn(peer); | |
2072 | if (!peer) { | |
e50f7cfd | 2073 | flog_err(EC_BGP_CONNECT, "%%Neighbor failed in xfer_conn"); |
d62a17ae | 2074 | return -1; |
93406d87 | 2075 | } |
93406d87 | 2076 | |
d62a17ae | 2077 | if (other == peer) |
996c9314 LB |
2078 | ret = 1; /* bgp_establish specific code when xfer_conn |
2079 | happens. */ | |
d62a17ae | 2080 | |
2081 | /* Reset capability open status flag. */ | |
2082 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN)) | |
2083 | SET_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN); | |
2084 | ||
2085 | /* Clear start timer value to default. */ | |
2086 | peer->v_start = BGP_INIT_START_TIMER; | |
2087 | ||
2088 | /* Increment established count. */ | |
2089 | peer->established++; | |
2090 | bgp_fsm_change_status(peer, Established); | |
2091 | ||
2092 | /* bgp log-neighbor-changes of neighbor Up */ | |
892fedb6 | 2093 | if (CHECK_FLAG(peer->bgp->flags, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { |
d62a17ae | 2094 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); |
892fedb6 DA |
2095 | zlog_info( |
2096 | "%%ADJCHANGE: neighbor %s(%s) in vrf %s Up", peer->host, | |
2097 | (peer->hostname) ? peer->hostname : "Unknown", | |
2098 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) ? vrf->name | |
2099 | : VRF_DEFAULT_NAME) | |
2100 | : ""); | |
d62a17ae | 2101 | } |
2102 | /* assign update-group/subgroup */ | |
2103 | update_group_adjust_peer_afs(peer); | |
2104 | ||
2105 | /* graceful restart */ | |
2106 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
f009ff26 | 2107 | if (bgp_debug_neighbor_events(peer)) { |
2108 | if (BGP_PEER_RESTARTING_MODE(peer)) | |
36235319 | 2109 | zlog_debug("peer %s BGP_RESTARTING_MODE", peer->host); |
f009ff26 | 2110 | else if (BGP_PEER_HELPER_MODE(peer)) |
36235319 | 2111 | zlog_debug("peer %s BGP_HELPER_MODE", peer->host); |
f009ff26 | 2112 | } |
df8d723c DA |
2113 | |
2114 | FOREACH_AFI_SAFI_NSF (afi, safi) { | |
2115 | if (peer->afc_nego[afi][safi] && | |
2116 | CHECK_FLAG(peer->cap, PEER_CAP_RESTART_ADV) && | |
2117 | CHECK_FLAG(peer->af_cap[afi][safi], | |
2118 | PEER_CAP_RESTART_AF_RCV)) { | |
2119 | if (peer->nsf[afi][safi] && | |
2120 | !CHECK_FLAG(peer->af_cap[afi][safi], | |
2121 | PEER_CAP_RESTART_AF_PRESERVE_RCV)) | |
2122 | bgp_clear_stale_route(peer, afi, safi); | |
2123 | ||
2124 | peer->nsf[afi][safi] = 1; | |
2125 | nsf_af_count++; | |
2126 | } else { | |
2127 | if (peer->nsf[afi][safi]) | |
2128 | bgp_clear_stale_route(peer, afi, safi); | |
2129 | peer->nsf[afi][safi] = 0; | |
2130 | } | |
2131 | /* Update the graceful restart information */ | |
2132 | if (peer->afc_nego[afi][safi]) { | |
2133 | if (!BGP_SELECT_DEFER_DISABLE(peer->bgp)) { | |
2134 | status = bgp_update_gr_info(peer, afi, safi); | |
2135 | if (status < 0) | |
2136 | zlog_err( | |
2137 | "Error in updating graceful restart for %s", | |
2138 | get_afi_safi_str(afi, safi, | |
2139 | false)); | |
d62a17ae | 2140 | } else { |
df8d723c DA |
2141 | if (BGP_PEER_GRACEFUL_RESTART_CAPABLE(peer) && |
2142 | BGP_PEER_RESTARTING_MODE(peer) && | |
2143 | CHECK_FLAG(peer->bgp->flags, | |
2144 | BGP_FLAG_GR_PRESERVE_FWD)) | |
2145 | peer->bgp->gr_info[afi][safi] | |
2146 | .eor_required++; | |
f009ff26 | 2147 | } |
d62a17ae | 2148 | } |
df8d723c | 2149 | } |
d62a17ae | 2150 | |
77b34214 NT |
2151 | if (!CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV)) { |
2152 | if ((bgp_peer_gr_mode_get(peer) == PEER_GR) | |
2153 | || ((bgp_peer_gr_mode_get(peer) == PEER_GLOBAL_INHERIT) | |
2154 | && (bgp_global_gr_mode_get(peer->bgp) == GLOBAL_GR))) { | |
2155 | FOREACH_AFI_SAFI (afi, safi) | |
2156 | /* Send route processing complete | |
2157 | message to RIB */ | |
2158 | bgp_zebra_update( | |
2159 | afi, safi, peer->bgp->vrf_id, | |
2160 | ZEBRA_CLIENT_ROUTE_UPDATE_COMPLETE); | |
2161 | } | |
2162 | } else { | |
2163 | /* Peer sends R-bit. In this case, we need to send | |
2164 | * ZEBRA_CLIENT_ROUTE_UPDATE_COMPLETE to Zebra. */ | |
2165 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_BIT_RCV)) { | |
2166 | FOREACH_AFI_SAFI (afi, safi) | |
2167 | /* Send route processing complete | |
2168 | message to RIB */ | |
2169 | bgp_zebra_update( | |
2170 | afi, safi, peer->bgp->vrf_id, | |
2171 | ZEBRA_CLIENT_ROUTE_UPDATE_COMPLETE); | |
2172 | } | |
2173 | } | |
2174 | ||
794b37d5 | 2175 | peer->nsf_af_count = nsf_af_count; |
2176 | ||
d62a17ae | 2177 | if (nsf_af_count) |
2178 | SET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
2179 | else { | |
2180 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
2181 | if (peer->t_gr_stale) { | |
2182 | BGP_TIMER_OFF(peer->t_gr_stale); | |
2183 | if (bgp_debug_neighbor_events(peer)) | |
2184 | zlog_debug( | |
2185 | "%s graceful restart stalepath timer stopped", | |
2186 | peer->host); | |
2187 | } | |
2188 | } | |
93406d87 | 2189 | |
d62a17ae | 2190 | if (peer->t_gr_restart) { |
2191 | BGP_TIMER_OFF(peer->t_gr_restart); | |
2192 | if (bgp_debug_neighbor_events(peer)) | |
2193 | zlog_debug("%s graceful restart timer stopped", | |
2194 | peer->host); | |
2195 | } | |
718e3744 | 2196 | |
9eb217ff QY |
2197 | /* Reset uptime, turn on keepalives, send current table. */ |
2198 | if (!peer->v_holdtime) | |
2199 | bgp_keepalives_on(peer); | |
2200 | ||
d62a17ae | 2201 | peer->uptime = bgp_clock(); |
2202 | ||
2203 | /* Send route-refresh when ORF is enabled */ | |
05c7a1cc QY |
2204 | FOREACH_AFI_SAFI (afi, safi) { |
2205 | if (CHECK_FLAG(peer->af_cap[afi][safi], | |
2206 | PEER_CAP_ORF_PREFIX_SM_ADV)) { | |
d62a17ae | 2207 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc | 2208 | PEER_CAP_ORF_PREFIX_RM_RCV)) |
9af52ccf DA |
2209 | bgp_route_refresh_send( |
2210 | peer, afi, safi, ORF_TYPE_PREFIX, | |
2211 | REFRESH_IMMEDIATE, 0, | |
2212 | BGP_ROUTE_REFRESH_NORMAL); | |
05c7a1cc QY |
2213 | else if (CHECK_FLAG(peer->af_cap[afi][safi], |
2214 | PEER_CAP_ORF_PREFIX_RM_OLD_RCV)) | |
9af52ccf DA |
2215 | bgp_route_refresh_send( |
2216 | peer, afi, safi, ORF_TYPE_PREFIX_OLD, | |
2217 | REFRESH_IMMEDIATE, 0, | |
2218 | BGP_ROUTE_REFRESH_NORMAL); | |
05c7a1cc QY |
2219 | } |
2220 | } | |
d62a17ae | 2221 | |
2222 | /* First update is deferred until ORF or ROUTE-REFRESH is received */ | |
05c7a1cc QY |
2223 | FOREACH_AFI_SAFI (afi, safi) { |
2224 | if (CHECK_FLAG(peer->af_cap[afi][safi], | |
2225 | PEER_CAP_ORF_PREFIX_RM_ADV)) | |
d62a17ae | 2226 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc QY |
2227 | PEER_CAP_ORF_PREFIX_SM_RCV) |
2228 | || CHECK_FLAG(peer->af_cap[afi][safi], | |
2229 | PEER_CAP_ORF_PREFIX_SM_OLD_RCV)) | |
2230 | SET_FLAG(peer->af_sflags[afi][safi], | |
2231 | PEER_STATUS_ORF_WAIT_REFRESH); | |
2232 | } | |
d62a17ae | 2233 | |
2234 | bgp_announce_peer(peer); | |
2235 | ||
2236 | /* Start the route advertisement timer to send updates to the peer - if | |
2237 | * BGP | |
2238 | * is not in read-only mode. If it is, the timer will be started at the | |
2239 | * end | |
2240 | * of read-only mode. | |
2241 | */ | |
2242 | if (!bgp_update_delay_active(peer->bgp)) { | |
2243 | BGP_TIMER_OFF(peer->t_routeadv); | |
2244 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
2245 | } | |
718e3744 | 2246 | |
d62a17ae | 2247 | if (peer->doppelganger && (peer->doppelganger->status != Deleted)) { |
2248 | if (bgp_debug_neighbor_events(peer)) | |
2249 | zlog_debug( | |
2250 | "[Event] Deleting stub connection for peer %s", | |
2251 | peer->host); | |
2252 | ||
2253 | if (peer->doppelganger->status > Active) | |
2254 | bgp_notify_send(peer->doppelganger, BGP_NOTIFY_CEASE, | |
2255 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
2256 | else | |
2257 | peer_delete(peer->doppelganger); | |
718e3744 | 2258 | } |
2259 | ||
19bd3dff DS |
2260 | /* |
2261 | * If we are replacing the old peer for a doppelganger | |
2262 | * then switch it around in the bgp->peerhash | |
2263 | * the doppelgangers su and this peer's su are the same | |
2264 | * so the hash_release is the same for either. | |
2265 | */ | |
2266 | hash_release(peer->bgp->peerhash, peer); | |
2267 | hash_get(peer->bgp->peerhash, peer, hash_alloc_intern); | |
2268 | ||
21bfce98 RZ |
2269 | /* Start BFD peer if not already running. */ |
2270 | if (peer->bfd_config) | |
2271 | bgp_peer_bfd_update_source(peer); | |
2272 | ||
d62a17ae | 2273 | return ret; |
718e3744 | 2274 | } |
2275 | ||
2276 | /* Keepalive packet is received. */ | |
d62a17ae | 2277 | static int bgp_fsm_keepalive(struct peer *peer) |
718e3744 | 2278 | { |
d62a17ae | 2279 | BGP_TIMER_OFF(peer->t_holdtime); |
2280 | return 0; | |
718e3744 | 2281 | } |
2282 | ||
2283 | /* Update packet is received. */ | |
d62a17ae | 2284 | static int bgp_fsm_update(struct peer *peer) |
718e3744 | 2285 | { |
d62a17ae | 2286 | BGP_TIMER_OFF(peer->t_holdtime); |
2287 | return 0; | |
718e3744 | 2288 | } |
2289 | ||
2290 | /* This is empty event. */ | |
d62a17ae | 2291 | static int bgp_ignore(struct peer *peer) |
718e3744 | 2292 | { |
af4c2728 | 2293 | flog_err( |
e50f7cfd | 2294 | EC_BGP_FSM, |
d62a17ae | 2295 | "%s [FSM] Ignoring event %s in state %s, prior events %s, %s, fd %d", |
2296 | peer->host, bgp_event_str[peer->cur_event], | |
2297 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
2298 | bgp_event_str[peer->last_event], | |
2299 | bgp_event_str[peer->last_major_event], peer->fd); | |
2300 | return 0; | |
718e3744 | 2301 | } |
6b0655a2 | 2302 | |
6403814c | 2303 | /* This is to handle unexpected events.. */ |
d62a17ae | 2304 | static int bgp_fsm_exeption(struct peer *peer) |
6403814c | 2305 | { |
af4c2728 | 2306 | flog_err( |
e50f7cfd | 2307 | EC_BGP_FSM, |
d62a17ae | 2308 | "%s [FSM] Unexpected event %s in state %s, prior events %s, %s, fd %d", |
2309 | peer->host, bgp_event_str[peer->cur_event], | |
2310 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
2311 | bgp_event_str[peer->last_event], | |
2312 | bgp_event_str[peer->last_major_event], peer->fd); | |
2313 | return (bgp_stop(peer)); | |
6403814c DS |
2314 | } |
2315 | ||
f8dcd38d | 2316 | void bgp_fsm_nht_update(struct peer *peer, bool has_valid_nexthops) |
fc9a856f | 2317 | { |
d62a17ae | 2318 | if (!peer) |
2319 | return; | |
2320 | ||
2321 | switch (peer->status) { | |
2322 | case Idle: | |
f8dcd38d | 2323 | if (has_valid_nexthops) |
d62a17ae | 2324 | BGP_EVENT_ADD(peer, BGP_Start); |
2325 | break; | |
2326 | case Connect: | |
f8dcd38d | 2327 | if (!has_valid_nexthops) { |
d62a17ae | 2328 | BGP_TIMER_OFF(peer->t_connect); |
2329 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
2330 | } | |
2331 | break; | |
2332 | case Active: | |
f8dcd38d | 2333 | if (has_valid_nexthops) { |
d62a17ae | 2334 | BGP_TIMER_OFF(peer->t_connect); |
2335 | BGP_EVENT_ADD(peer, ConnectRetry_timer_expired); | |
2336 | } | |
2337 | break; | |
2338 | case OpenSent: | |
2339 | case OpenConfirm: | |
2340 | case Established: | |
f8dcd38d | 2341 | if (!has_valid_nexthops |
f852eb98 PG |
2342 | && (peer->gtsm_hops == BGP_GTSM_HOPS_CONNECTED |
2343 | || peer->bgp->fast_convergence)) | |
d62a17ae | 2344 | BGP_EVENT_ADD(peer, TCP_fatal_error); |
2345 | case Clearing: | |
2346 | case Deleted: | |
2347 | default: | |
2348 | break; | |
fc9a856f | 2349 | } |
fc9a856f DS |
2350 | } |
2351 | ||
718e3744 | 2352 | /* Finite State Machine structure */ |
fda1d3e0 | 2353 | static const struct { |
d62a17ae | 2354 | int (*func)(struct peer *); |
8398b5d5 | 2355 | enum bgp_fsm_status next_state; |
d62a17ae | 2356 | } FSM[BGP_STATUS_MAX - 1][BGP_EVENTS_MAX - 1] = { |
2357 | { | |
2358 | /* Idle state: In Idle state, all events other than BGP_Start is | |
2359 | ignored. With BGP_Start event, finite state machine calls | |
2360 | bgp_start(). */ | |
2361 | {bgp_start, Connect}, /* BGP_Start */ | |
2362 | {bgp_stop, Idle}, /* BGP_Stop */ | |
2363 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
6c537a18 | 2364 | {bgp_stop, Idle}, /* TCP_connection_open_w_delay */ |
d62a17ae | 2365 | {bgp_stop, Idle}, /* TCP_connection_closed */ |
2366 | {bgp_ignore, Idle}, /* TCP_connection_open_failed */ | |
2367 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
2368 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ | |
2369 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
2370 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
6c537a18 | 2371 | {bgp_ignore, Idle}, /* DelayOpen_timer_expired */ |
d62a17ae | 2372 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ |
2373 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
2374 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
2375 | {bgp_ignore, Idle}, /* Receive_NOTIFICATION_message */ | |
2376 | {bgp_ignore, Idle}, /* Clearing_Completed */ | |
2377 | }, | |
2378 | { | |
2379 | /* Connect */ | |
2380 | {bgp_ignore, Connect}, /* BGP_Start */ | |
2381 | {bgp_stop, Idle}, /* BGP_Stop */ | |
2382 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
6c537a18 DS |
2383 | {bgp_connect_success_w_delayopen, |
2384 | Connect}, /* TCP_connection_open_w_delay */ | |
d62a17ae | 2385 | {bgp_stop, Idle}, /* TCP_connection_closed */ |
2386 | {bgp_connect_fail, Active}, /* TCP_connection_open_failed */ | |
2387 | {bgp_connect_fail, Idle}, /* TCP_fatal_error */ | |
2388 | {bgp_reconnect, Connect}, /* ConnectRetry_timer_expired */ | |
2389 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ | |
2390 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
6c537a18 DS |
2391 | {bgp_fsm_delayopen_timer_expire, |
2392 | OpenSent}, /* DelayOpen_timer_expired */ | |
2393 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ | |
2394 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
2395 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
2396 | {bgp_stop, Idle}, /* Receive_NOTIFICATION_message */ | |
2397 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
d62a17ae | 2398 | }, |
2399 | { | |
2400 | /* Active, */ | |
2401 | {bgp_ignore, Active}, /* BGP_Start */ | |
2402 | {bgp_stop, Idle}, /* BGP_Stop */ | |
2403 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
6c537a18 DS |
2404 | {bgp_connect_success_w_delayopen, |
2405 | Active}, /* TCP_connection_open_w_delay */ | |
d62a17ae | 2406 | {bgp_stop, Idle}, /* TCP_connection_closed */ |
2407 | {bgp_ignore, Active}, /* TCP_connection_open_failed */ | |
2408 | {bgp_fsm_exeption, Idle}, /* TCP_fatal_error */ | |
2409 | {bgp_start, Connect}, /* ConnectRetry_timer_expired */ | |
2410 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ | |
2411 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
6c537a18 DS |
2412 | {bgp_fsm_delayopen_timer_expire, |
2413 | OpenSent}, /* DelayOpen_timer_expired */ | |
2414 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ | |
2415 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
2416 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
2417 | {bgp_fsm_exeption, Idle}, /* Receive_NOTIFICATION_message */ | |
2418 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
d62a17ae | 2419 | }, |
2420 | { | |
2421 | /* OpenSent, */ | |
2422 | {bgp_ignore, OpenSent}, /* BGP_Start */ | |
2423 | {bgp_stop, Idle}, /* BGP_Stop */ | |
2424 | {bgp_stop, Active}, /* TCP_connection_open */ | |
6c537a18 | 2425 | {bgp_fsm_exeption, Idle}, /* TCP_connection_open_w_delay */ |
d62a17ae | 2426 | {bgp_stop, Active}, /* TCP_connection_closed */ |
2427 | {bgp_stop, Active}, /* TCP_connection_open_failed */ | |
2428 | {bgp_stop, Active}, /* TCP_fatal_error */ | |
2429 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ | |
2430 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
2431 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
6c537a18 | 2432 | {bgp_fsm_exeption, Idle}, /* DelayOpen_timer_expired */ |
d62a17ae | 2433 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ |
2434 | {bgp_fsm_event_error, Idle}, /* Receive_KEEPALIVE_message */ | |
2435 | {bgp_fsm_event_error, Idle}, /* Receive_UPDATE_message */ | |
53b4aaec | 2436 | {bgp_fsm_event_error, Idle}, /* Receive_NOTIFICATION_message */ |
d62a17ae | 2437 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ |
2438 | }, | |
2439 | { | |
2440 | /* OpenConfirm, */ | |
2441 | {bgp_ignore, OpenConfirm}, /* BGP_Start */ | |
2442 | {bgp_stop, Idle}, /* BGP_Stop */ | |
2443 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
6c537a18 | 2444 | {bgp_fsm_exeption, Idle}, /* TCP_connection_open_w_delay */ |
d62a17ae | 2445 | {bgp_stop, Idle}, /* TCP_connection_closed */ |
2446 | {bgp_stop, Idle}, /* TCP_connection_open_failed */ | |
2447 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
2448 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ | |
2449 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
2450 | {bgp_ignore, OpenConfirm}, /* KeepAlive_timer_expired */ | |
6c537a18 | 2451 | {bgp_fsm_exeption, Idle}, /* DelayOpen_timer_expired */ |
d62a17ae | 2452 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ |
2453 | {bgp_establish, Established}, /* Receive_KEEPALIVE_message */ | |
2454 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
2455 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
2456 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
2457 | }, | |
2458 | { | |
2459 | /* Established, */ | |
2460 | {bgp_ignore, Established}, /* BGP_Start */ | |
2461 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
2462 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
6c537a18 | 2463 | {bgp_fsm_exeption, Idle}, /* TCP_connection_open_w_delay */ |
d62a17ae | 2464 | {bgp_stop, Clearing}, /* TCP_connection_closed */ |
2465 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
2466 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
2467 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
2468 | {bgp_fsm_holdtime_expire, Clearing}, /* Hold_Timer_expired */ | |
03014d48 | 2469 | {bgp_ignore, Established}, /* KeepAlive_timer_expired */ |
6c537a18 | 2470 | {bgp_fsm_exeption, Idle}, /* DelayOpen_timer_expired */ |
03014d48 | 2471 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ |
d62a17ae | 2472 | {bgp_fsm_keepalive, |
2473 | Established}, /* Receive_KEEPALIVE_message */ | |
2474 | {bgp_fsm_update, Established}, /* Receive_UPDATE_message */ | |
2475 | {bgp_stop_with_error, | |
2476 | Clearing}, /* Receive_NOTIFICATION_message */ | |
2477 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
2478 | }, | |
2479 | { | |
2480 | /* Clearing, */ | |
2481 | {bgp_ignore, Clearing}, /* BGP_Start */ | |
2482 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
2483 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
6c537a18 | 2484 | {bgp_stop, Clearing}, /* TCP_connection_open_w_delay */ |
d62a17ae | 2485 | {bgp_stop, Clearing}, /* TCP_connection_closed */ |
2486 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
2487 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
2488 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
2489 | {bgp_stop, Clearing}, /* Hold_Timer_expired */ | |
2490 | {bgp_stop, Clearing}, /* KeepAlive_timer_expired */ | |
6c537a18 | 2491 | {bgp_stop, Clearing}, /* DelayOpen_timer_expired */ |
d62a17ae | 2492 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ |
2493 | {bgp_stop, Clearing}, /* Receive_KEEPALIVE_message */ | |
2494 | {bgp_stop, Clearing}, /* Receive_UPDATE_message */ | |
2495 | {bgp_stop, Clearing}, /* Receive_NOTIFICATION_message */ | |
2496 | {bgp_clearing_completed, Idle}, /* Clearing_Completed */ | |
2497 | }, | |
2498 | { | |
2499 | /* Deleted, */ | |
2500 | {bgp_ignore, Deleted}, /* BGP_Start */ | |
2501 | {bgp_ignore, Deleted}, /* BGP_Stop */ | |
2502 | {bgp_ignore, Deleted}, /* TCP_connection_open */ | |
6c537a18 | 2503 | {bgp_ignore, Deleted}, /* TCP_connection_open_w_delay */ |
d62a17ae | 2504 | {bgp_ignore, Deleted}, /* TCP_connection_closed */ |
2505 | {bgp_ignore, Deleted}, /* TCP_connection_open_failed */ | |
2506 | {bgp_ignore, Deleted}, /* TCP_fatal_error */ | |
2507 | {bgp_ignore, Deleted}, /* ConnectRetry_timer_expired */ | |
2508 | {bgp_ignore, Deleted}, /* Hold_Timer_expired */ | |
2509 | {bgp_ignore, Deleted}, /* KeepAlive_timer_expired */ | |
6c537a18 | 2510 | {bgp_ignore, Deleted}, /* DelayOpen_timer_expired */ |
d62a17ae | 2511 | {bgp_ignore, Deleted}, /* Receive_OPEN_message */ |
2512 | {bgp_ignore, Deleted}, /* Receive_KEEPALIVE_message */ | |
2513 | {bgp_ignore, Deleted}, /* Receive_UPDATE_message */ | |
2514 | {bgp_ignore, Deleted}, /* Receive_NOTIFICATION_message */ | |
2515 | {bgp_ignore, Deleted}, /* Clearing_Completed */ | |
2516 | }, | |
718e3744 | 2517 | }; |
2518 | ||
718e3744 | 2519 | /* Execute event process. */ |
cc9f21da | 2520 | void bgp_event(struct thread *thread) |
718e3744 | 2521 | { |
d1060698 | 2522 | enum bgp_fsm_events event; |
d62a17ae | 2523 | struct peer *peer; |
718e3744 | 2524 | |
d62a17ae | 2525 | peer = THREAD_ARG(thread); |
2526 | event = THREAD_VAL(thread); | |
718e3744 | 2527 | |
cc9f21da | 2528 | bgp_event_update(peer, event); |
1ff9a340 DS |
2529 | } |
2530 | ||
d1060698 | 2531 | int bgp_event_update(struct peer *peer, enum bgp_fsm_events event) |
1ff9a340 | 2532 | { |
8398b5d5 | 2533 | enum bgp_fsm_status next; |
d62a17ae | 2534 | int ret = 0; |
2535 | struct peer *other; | |
2536 | int passive_conn = 0; | |
2537 | int dyn_nbr; | |
2538 | ||
d8151687 QY |
2539 | /* default return code */ |
2540 | ret = FSM_PEER_NOOP; | |
2541 | ||
d62a17ae | 2542 | other = peer->doppelganger; |
2543 | passive_conn = | |
2544 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) ? 1 : 0; | |
2545 | dyn_nbr = peer_dynamic_neighbor(peer); | |
2546 | ||
2547 | /* Logging this event. */ | |
2548 | next = FSM[peer->status - 1][event - 1].next_state; | |
2549 | ||
2550 | if (bgp_debug_neighbor_events(peer) && peer->status != next) | |
2551 | zlog_debug("%s [FSM] %s (%s->%s), fd %d", peer->host, | |
2552 | bgp_event_str[event], | |
2553 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
2554 | lookup_msg(bgp_status_msg, next, NULL), peer->fd); | |
2555 | ||
2556 | peer->last_event = peer->cur_event; | |
2557 | peer->cur_event = event; | |
2558 | ||
2559 | /* Call function. */ | |
2560 | if (FSM[peer->status - 1][event - 1].func) | |
2561 | ret = (*(FSM[peer->status - 1][event - 1].func))(peer); | |
2562 | ||
d62a17ae | 2563 | if (ret >= 0) { |
2564 | if (ret == 1 && next == Established) { | |
2565 | /* The case when doppelganger swap accurred in | |
2566 | bgp_establish. | |
2567 | Update the peer pointer accordingly */ | |
d8151687 | 2568 | ret = FSM_PEER_TRANSFERRED; |
d62a17ae | 2569 | peer = other; |
2570 | } | |
2571 | ||
2572 | /* If status is changed. */ | |
d8151687 | 2573 | if (next != peer->status) { |
d62a17ae | 2574 | bgp_fsm_change_status(peer, next); |
2575 | ||
becedef6 QY |
2576 | /* |
2577 | * If we're going to ESTABLISHED then we executed a | |
2578 | * peer transfer. In this case we can either return | |
2579 | * FSM_PEER_TRANSITIONED or FSM_PEER_TRANSFERRED. | |
2580 | * Opting for TRANSFERRED since transfer implies | |
2581 | * session establishment. | |
2582 | */ | |
d8151687 QY |
2583 | if (ret != FSM_PEER_TRANSFERRED) |
2584 | ret = FSM_PEER_TRANSITIONED; | |
2585 | } | |
2586 | ||
d62a17ae | 2587 | /* Make sure timer is set. */ |
2588 | bgp_timer_set(peer); | |
2589 | ||
bea01226 | 2590 | } else { |
becedef6 QY |
2591 | /* |
2592 | * If we got a return value of -1, that means there was an | |
2593 | * error, restart the FSM. Since bgp_stop() was called on the | |
2594 | * peer. only a few fields are safe to access here. In any case | |
2595 | * we need to indicate that the peer was stopped in the return | |
2596 | * code. | |
2597 | */ | |
bea01226 | 2598 | if (!dyn_nbr && !passive_conn && peer->bgp) { |
af4c2728 | 2599 | flog_err( |
e50f7cfd | 2600 | EC_BGP_FSM, |
3efd0893 | 2601 | "%s [FSM] Failure handling event %s in state %s, prior events %s, %s, fd %d", |
bea01226 QY |
2602 | peer->host, bgp_event_str[peer->cur_event], |
2603 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
2604 | bgp_event_str[peer->last_event], | |
2605 | bgp_event_str[peer->last_major_event], | |
2606 | peer->fd); | |
2607 | bgp_stop(peer); | |
2608 | bgp_fsm_change_status(peer, Idle); | |
2609 | bgp_timer_set(peer); | |
2610 | } | |
2611 | ret = FSM_PEER_STOPPED; | |
d62a17ae | 2612 | } |
bea01226 | 2613 | |
d62a17ae | 2614 | return ret; |
718e3744 | 2615 | } |
794b37d5 | 2616 | /* BGP GR Code */ |
2617 | ||
2618 | int bgp_gr_lookup_n_update_all_peer(struct bgp *bgp, | |
36235319 QY |
2619 | enum global_mode global_new_state, |
2620 | enum global_mode global_old_state) | |
794b37d5 | 2621 | { |
2622 | struct peer *peer = {0}; | |
2623 | struct listnode *node = {0}; | |
2624 | struct listnode *nnode = {0}; | |
36235319 | 2625 | enum peer_mode peer_old_state = PEER_INVALID; |
794b37d5 | 2626 | |
2627 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) { | |
2628 | ||
2629 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
36235319 QY |
2630 | zlog_debug("%s [BGP_GR] Peer: (%s) :", __func__, |
2631 | peer->host); | |
794b37d5 | 2632 | |
2633 | peer_old_state = bgp_peer_gr_mode_get(peer); | |
2634 | ||
2635 | if (peer_old_state == PEER_GLOBAL_INHERIT) { | |
2636 | ||
36235319 QY |
2637 | /* |
2638 | *Reset only these peers and send a | |
2639 | *new open message with the change capabilities. | |
2640 | *Considering the mode to be "global_new_state" and | |
2641 | *do all operation accordingly | |
2642 | */ | |
794b37d5 | 2643 | |
2644 | switch (global_new_state) { | |
794b37d5 | 2645 | case GLOBAL_HELPER: |
794b37d5 | 2646 | BGP_PEER_GR_HELPER_ENABLE(peer); |
2647 | break; | |
2648 | case GLOBAL_GR: | |
794b37d5 | 2649 | BGP_PEER_GR_ENABLE(peer); |
2650 | break; | |
2651 | case GLOBAL_DISABLE: | |
794b37d5 | 2652 | BGP_PEER_GR_DISABLE(peer); |
2653 | break; | |
2654 | case GLOBAL_INVALID: | |
36235319 QY |
2655 | zlog_debug("%s [BGP_GR] GLOBAL_INVALID", |
2656 | __func__); | |
794b37d5 | 2657 | return BGP_ERR_GR_OPERATION_FAILED; |
794b37d5 | 2658 | } |
2659 | } | |
2660 | } | |
2661 | ||
2662 | bgp->global_gr_present_state = global_new_state; | |
2663 | ||
794b37d5 | 2664 | return BGP_GR_SUCCESS; |
2665 | } | |
2666 | ||
2ba1fe69 | 2667 | int bgp_gr_update_all(struct bgp *bgp, int global_gr_cmd) |
794b37d5 | 2668 | { |
2669 | enum global_mode global_new_state = GLOBAL_INVALID; | |
2670 | enum global_mode global_old_state = GLOBAL_INVALID; | |
2671 | ||
2672 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
36235319 QY |
2673 | zlog_debug("%s [BGP_GR]START: global_gr_cmd :%s:", __func__, |
2674 | print_global_gr_cmd(global_gr_cmd)); | |
794b37d5 | 2675 | |
2676 | global_old_state = bgp_global_gr_mode_get(bgp); | |
2677 | ||
2ba1fe69 | 2678 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
36235319 QY |
2679 | zlog_debug("[BGP_GR] global_old_gr_state :%s:", |
2680 | print_global_gr_mode(global_old_state)); | |
794b37d5 | 2681 | |
2ba1fe69 | 2682 | if (global_old_state != GLOBAL_INVALID) { |
794b37d5 | 2683 | global_new_state = |
2ba1fe69 | 2684 | bgp->GLOBAL_GR_FSM[global_old_state][global_gr_cmd]; |
2685 | ||
2686 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
36235319 QY |
2687 | zlog_debug("[BGP_GR] global_new_gr_state :%s:", |
2688 | print_global_gr_mode(global_new_state)); | |
794b37d5 | 2689 | } else { |
36235319 QY |
2690 | zlog_err("%s [BGP_GR] global_old_state == GLOBAL_INVALID", |
2691 | __func__); | |
794b37d5 | 2692 | return BGP_ERR_GR_OPERATION_FAILED; |
2693 | } | |
2694 | ||
2695 | if (global_new_state == GLOBAL_INVALID) { | |
36235319 QY |
2696 | zlog_err("%s [BGP_GR] global_new_state == GLOBAL_INVALID", |
2697 | __func__); | |
794b37d5 | 2698 | return BGP_ERR_GR_INVALID_CMD; |
2699 | } | |
2700 | if (global_new_state == global_old_state) { | |
2701 | /* Trace msg */ | |
2ba1fe69 | 2702 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
2703 | zlog_debug( | |
36235319 QY |
2704 | "%s [BGP_GR] global_new_state == global_old_state :%s", |
2705 | __func__, | |
2706 | print_global_gr_mode(global_new_state)); | |
794b37d5 | 2707 | return BGP_GR_NO_OPERATION; |
2708 | } | |
2709 | ||
36235319 QY |
2710 | return bgp_gr_lookup_n_update_all_peer(bgp, global_new_state, |
2711 | global_old_state); | |
794b37d5 | 2712 | } |
2713 | ||
2ba1fe69 | 2714 | const char *print_peer_gr_mode(enum peer_mode pr_mode) |
2715 | { | |
2716 | const char *peer_gr_mode = NULL; | |
2717 | ||
2718 | switch (pr_mode) { | |
2719 | case PEER_HELPER: | |
2720 | peer_gr_mode = "PEER_HELPER"; | |
2721 | break; | |
2722 | case PEER_GR: | |
2723 | peer_gr_mode = "PEER_GR"; | |
2724 | break; | |
2725 | case PEER_DISABLE: | |
2726 | peer_gr_mode = "PEER_DISABLE"; | |
2727 | break; | |
2728 | case PEER_INVALID: | |
2729 | peer_gr_mode = "PEER_INVALID"; | |
2730 | break; | |
2731 | case PEER_GLOBAL_INHERIT: | |
2732 | peer_gr_mode = "PEER_GLOBAL_INHERIT"; | |
2733 | break; | |
2734 | } | |
2735 | ||
2736 | return peer_gr_mode; | |
2737 | } | |
2738 | ||
2739 | const char *print_peer_gr_cmd(enum peer_gr_command pr_gr_cmd) | |
2740 | { | |
2741 | const char *peer_gr_cmd = NULL; | |
2742 | ||
2743 | switch (pr_gr_cmd) { | |
2744 | case PEER_GR_CMD: | |
2745 | peer_gr_cmd = "PEER_GR_CMD"; | |
2746 | break; | |
2747 | case NO_PEER_GR_CMD: | |
2748 | peer_gr_cmd = "NO_PEER_GR_CMD"; | |
2749 | break; | |
2750 | case PEER_DISABLE_CMD: | |
2751 | peer_gr_cmd = "PEER_GR_CMD"; | |
2752 | break; | |
2753 | case NO_PEER_DISABLE_CMD: | |
2754 | peer_gr_cmd = "NO_PEER_GR_CMD"; | |
2755 | break; | |
2756 | case PEER_HELPER_CMD: | |
2757 | peer_gr_cmd = "PEER_HELPER_CMD"; | |
2758 | break; | |
2759 | case NO_PEER_HELPER_CMD: | |
2760 | peer_gr_cmd = "NO_PEER_HELPER_CMD"; | |
2761 | break; | |
2762 | } | |
2763 | ||
2764 | return peer_gr_cmd; | |
2765 | } | |
2766 | ||
2767 | const char *print_global_gr_mode(enum global_mode gl_mode) | |
2768 | { | |
2769 | const char *global_gr_mode = NULL; | |
2770 | ||
2771 | switch (gl_mode) { | |
2772 | case GLOBAL_HELPER: | |
2773 | global_gr_mode = "GLOBAL_HELPER"; | |
2774 | break; | |
2775 | case GLOBAL_GR: | |
2776 | global_gr_mode = "GLOBAL_GR"; | |
2777 | break; | |
2778 | case GLOBAL_DISABLE: | |
2779 | global_gr_mode = "GLOBAL_DISABLE"; | |
2780 | break; | |
2781 | case GLOBAL_INVALID: | |
2782 | global_gr_mode = "GLOBAL_INVALID"; | |
2783 | break; | |
2784 | } | |
2785 | ||
2786 | return global_gr_mode; | |
2787 | } | |
2788 | ||
2789 | const char *print_global_gr_cmd(enum global_gr_command gl_gr_cmd) | |
2790 | { | |
2791 | const char *global_gr_cmd = NULL; | |
2792 | ||
2793 | switch (gl_gr_cmd) { | |
2794 | case GLOBAL_GR_CMD: | |
2795 | global_gr_cmd = "GLOBAL_GR_CMD"; | |
2796 | break; | |
2797 | case NO_GLOBAL_GR_CMD: | |
2798 | global_gr_cmd = "NO_GLOBAL_GR_CMD"; | |
2799 | break; | |
2800 | case GLOBAL_DISABLE_CMD: | |
2801 | global_gr_cmd = "GLOBAL_DISABLE_CMD"; | |
2802 | break; | |
2803 | case NO_GLOBAL_DISABLE_CMD: | |
2804 | global_gr_cmd = "NO_GLOBAL_DISABLE_CMD"; | |
2805 | break; | |
2806 | } | |
2807 | ||
2808 | return global_gr_cmd; | |
2809 | } | |
2810 | ||
794b37d5 | 2811 | enum global_mode bgp_global_gr_mode_get(struct bgp *bgp) |
2812 | { | |
2813 | return bgp->global_gr_present_state; | |
2814 | } | |
2815 | ||
2816 | enum peer_mode bgp_peer_gr_mode_get(struct peer *peer) | |
2817 | { | |
2818 | return peer->peer_gr_present_state; | |
2819 | } | |
2820 | ||
36235319 | 2821 | int bgp_neighbor_graceful_restart(struct peer *peer, int peer_gr_cmd) |
794b37d5 | 2822 | { |
36235319 QY |
2823 | enum peer_mode peer_new_state = PEER_INVALID; |
2824 | enum peer_mode peer_old_state = PEER_INVALID; | |
794b37d5 | 2825 | struct bgp_peer_gr peer_state; |
2826 | int result = BGP_GR_FAILURE; | |
2827 | ||
2828 | /* | |
2829 | * fetch peer_old_state from peer structure also | |
2830 | * fetch global_old_state from bgp structure, | |
2831 | * peer had a back pointer to bgpo struct ; | |
2832 | */ | |
2833 | ||
2834 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
36235319 QY |
2835 | zlog_debug("%s [BGP_GR] START:Peer: (%s) : peer_gr_cmd :%s:", |
2836 | __func__, peer->host, | |
2837 | print_peer_gr_cmd(peer_gr_cmd)); | |
794b37d5 | 2838 | |
2839 | peer_old_state = bgp_peer_gr_mode_get(peer); | |
2840 | ||
2841 | if (peer_old_state == PEER_INVALID) { | |
36235319 | 2842 | zlog_debug("[BGP_GR] peer_old_state == Invalid state !"); |
794b37d5 | 2843 | return BGP_ERR_GR_OPERATION_FAILED; |
2844 | } | |
2845 | ||
2ba1fe69 | 2846 | peer_state = peer->PEER_GR_FSM[peer_old_state][peer_gr_cmd]; |
794b37d5 | 2847 | peer_new_state = peer_state.next_state; |
2848 | ||
2849 | if (peer_new_state == PEER_INVALID) { | |
794b37d5 | 2850 | zlog_debug( |
2ba1fe69 | 2851 | "[BGP_GR] Invalid bgp graceful restart command used !"); |
794b37d5 | 2852 | return BGP_ERR_GR_INVALID_CMD; |
2853 | } | |
2854 | ||
2855 | if (peer_new_state != peer_old_state) { | |
36235319 QY |
2856 | result = peer_state.action_fun(peer, peer_old_state, |
2857 | peer_new_state); | |
794b37d5 | 2858 | } else { |
2ba1fe69 | 2859 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
2860 | zlog_debug( | |
36235319 | 2861 | "[BGP_GR] peer_old_state == peer_new_state !"); |
794b37d5 | 2862 | return BGP_GR_NO_OPERATION; |
2863 | } | |
2864 | ||
2865 | if (result == BGP_GR_SUCCESS) { | |
2866 | ||
2867 | /* Update the mode i.e peer_new_state into the peer structure */ | |
2868 | peer->peer_gr_present_state = peer_new_state; | |
794b37d5 | 2869 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
36235319 | 2870 | zlog_debug( |
2089dd80 | 2871 | "[BGP_GR] Successfully change the state of the peer to : %s : !", |
36235319 | 2872 | print_peer_gr_mode(peer_new_state)); |
794b37d5 | 2873 | |
2874 | return BGP_GR_SUCCESS; | |
2875 | } | |
2876 | ||
2877 | return result; | |
2878 | } | |
2879 | ||
36235319 QY |
2880 | unsigned int bgp_peer_gr_action(struct peer *peer, int old_peer_state, |
2881 | int new_peer_state) | |
794b37d5 | 2882 | { |
2883 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2884 | zlog_debug( | |
2ba1fe69 | 2885 | "%s [BGP_GR] Move peer from old_peer_state :%s: to new_peer_state :%s: !!!!", |
2886 | __func__, print_peer_gr_mode(old_peer_state), | |
2887 | print_peer_gr_mode(new_peer_state)); | |
794b37d5 | 2888 | |
2889 | int bgp_gr_global_mode = GLOBAL_INVALID; | |
2890 | unsigned int ret = BGP_GR_FAILURE; | |
2891 | ||
2892 | if (old_peer_state == new_peer_state) { | |
36235319 QY |
2893 | /* Nothing to do over here as the present and old state is the |
2894 | * same */ | |
794b37d5 | 2895 | return BGP_GR_NO_OPERATION; |
2896 | } | |
36235319 QY |
2897 | if ((old_peer_state == PEER_INVALID) |
2898 | || (new_peer_state == PEER_INVALID)) { | |
2899 | /* something bad happend , print error message */ | |
794b37d5 | 2900 | return BGP_ERR_GR_INVALID_CMD; |
2901 | } | |
2902 | ||
2903 | bgp_gr_global_mode = bgp_global_gr_mode_get(peer->bgp); | |
2904 | ||
36235319 QY |
2905 | if ((old_peer_state == PEER_GLOBAL_INHERIT) |
2906 | && (new_peer_state != PEER_GLOBAL_INHERIT)) { | |
794b37d5 | 2907 | |
2908 | /* fetch the Mode running in the Global state machine | |
2909 | *from the bgp structure into a variable called | |
2910 | *bgp_gr_global_mode | |
2911 | */ | |
2912 | ||
2913 | /* Here we are checking if the | |
2914 | *1. peer_new_state == global_mode == helper_mode | |
2915 | *2. peer_new_state == global_mode == GR_mode | |
2916 | *3. peer_new_state == global_mode == disabled_mode | |
2917 | */ | |
2918 | ||
2919 | BGP_PEER_GR_GLOBAL_INHERIT_UNSET(peer); | |
2920 | ||
2921 | if (new_peer_state == bgp_gr_global_mode) { | |
36235319 QY |
2922 | /*This is incremental updates i.e no tear down |
2923 | *of the existing session | |
2924 | *as the peer is already working in the same mode. | |
2925 | */ | |
794b37d5 | 2926 | ret = BGP_GR_SUCCESS; |
2927 | } else { | |
2928 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2929 | zlog_debug( | |
2ba1fe69 | 2930 | "[BGP_GR] Peer state changed from :%s ", |
2931 | print_peer_gr_mode(old_peer_state)); | |
794b37d5 | 2932 | |
2933 | bgp_peer_move_to_gr_mode(peer, new_peer_state); | |
2934 | ||
2935 | ret = BGP_GR_SUCCESS; | |
2936 | } | |
2937 | } | |
2938 | /* In the case below peer is going into Global inherit mode i.e. | |
2939 | * the peer would work as the mode configured at the global level | |
2940 | */ | |
36235319 QY |
2941 | else if ((new_peer_state == PEER_GLOBAL_INHERIT) |
2942 | && (old_peer_state != PEER_GLOBAL_INHERIT)) { | |
794b37d5 | 2943 | /* Here in this case it would be destructive |
2944 | * in all the cases except one case when, | |
2945 | * Global GR is configured Disabled | |
2946 | * and present_peer_state is not disable | |
2947 | */ | |
2948 | ||
2949 | BGP_PEER_GR_GLOBAL_INHERIT_SET(peer); | |
2950 | ||
2951 | if (old_peer_state == bgp_gr_global_mode) { | |
2952 | ||
2953 | /* This is incremental updates | |
2954 | *i.e no tear down of the existing session | |
2955 | *as the peer is already working in the same mode. | |
2956 | */ | |
2957 | ret = BGP_GR_SUCCESS; | |
2958 | } else { | |
2959 | /* Destructive always */ | |
2960 | /* Tear down the old session | |
2961 | * and send the new capability | |
2962 | * as per the bgp_gr_global_mode | |
2963 | */ | |
2964 | ||
2965 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
36235319 QY |
2966 | zlog_debug( |
2967 | "[BGP_GR] Peer state changed from :%s", | |
2ba1fe69 | 2968 | print_peer_gr_mode(old_peer_state)); |
794b37d5 | 2969 | |
2970 | bgp_peer_move_to_gr_mode(peer, bgp_gr_global_mode); | |
2971 | ||
2972 | ret = BGP_GR_SUCCESS; | |
2973 | } | |
2974 | } else { | |
2975 | /* | |
2976 | *This else case, it include all the cases except --> | |
2977 | *(new_peer_state != Peer_Global) && | |
2978 | *( old_peer_state != Peer_Global ) | |
2979 | */ | |
2980 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2ba1fe69 | 2981 | zlog_debug("[BGP_GR] Peer state changed from :%s", |
36235319 | 2982 | print_peer_gr_mode(old_peer_state)); |
794b37d5 | 2983 | |
2984 | bgp_peer_move_to_gr_mode(peer, new_peer_state); | |
2985 | ||
2986 | ret = BGP_GR_SUCCESS; | |
2987 | } | |
2988 | ||
2989 | return ret; | |
2990 | } | |
2991 | ||
2992 | inline void bgp_peer_move_to_gr_mode(struct peer *peer, int new_state) | |
2993 | ||
2994 | { | |
2995 | int bgp_global_gr_mode = bgp_global_gr_mode_get(peer->bgp); | |
2996 | ||
2997 | switch (new_state) { | |
794b37d5 | 2998 | case PEER_HELPER: |
2999 | BGP_PEER_GR_HELPER_ENABLE(peer); | |
3000 | break; | |
794b37d5 | 3001 | case PEER_GR: |
3002 | BGP_PEER_GR_ENABLE(peer); | |
3003 | break; | |
794b37d5 | 3004 | case PEER_DISABLE: |
3005 | BGP_PEER_GR_DISABLE(peer); | |
3006 | break; | |
794b37d5 | 3007 | case PEER_GLOBAL_INHERIT: |
3008 | BGP_PEER_GR_GLOBAL_INHERIT_SET(peer); | |
3009 | ||
3010 | if (bgp_global_gr_mode == GLOBAL_HELPER) { | |
3011 | BGP_PEER_GR_HELPER_ENABLE(peer); | |
36235319 | 3012 | } else if (bgp_global_gr_mode == GLOBAL_GR) { |
794b37d5 | 3013 | BGP_PEER_GR_ENABLE(peer); |
3014 | } else if (bgp_global_gr_mode == GLOBAL_DISABLE) { | |
3015 | BGP_PEER_GR_DISABLE(peer); | |
3016 | } else { | |
2ba1fe69 | 3017 | zlog_err( |
36235319 | 3018 | "[BGP_GR] Default switch inherit mode ::: SOMETHING IS WRONG !!!"); |
794b37d5 | 3019 | } |
3020 | break; | |
3021 | default: | |
36235319 QY |
3022 | zlog_err( |
3023 | "[BGP_GR] Default switch mode ::: SOMETHING IS WRONG !!!"); | |
794b37d5 | 3024 | break; |
3025 | } | |
3026 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2ba1fe69 | 3027 | zlog_debug("[BGP_GR] Peer state changed --to--> : %d : !", |
36235319 | 3028 | new_state); |
794b37d5 | 3029 | } |
3030 | ||
3031 | void bgp_peer_gr_flags_update(struct peer *peer) | |
3032 | { | |
3033 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
36235319 | 3034 | zlog_debug("%s [BGP_GR] called !", __func__); |
794b37d5 | 3035 | if (CHECK_FLAG(peer->peer_gr_new_status_flag, |
36235319 QY |
3036 | PEER_GRACEFUL_RESTART_NEW_STATE_HELPER)) |
3037 | SET_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART_HELPER); | |
794b37d5 | 3038 | else |
36235319 | 3039 | UNSET_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART_HELPER); |
794b37d5 | 3040 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
3041 | zlog_debug( | |
2ba1fe69 | 3042 | "[BGP_GR] Peer %s Flag PEER_FLAG_GRACEFUL_RESTART_HELPER : %s : !", |
794b37d5 | 3043 | peer->host, |
2986cac2 | 3044 | (CHECK_FLAG(peer->flags, |
36235319 QY |
3045 | PEER_FLAG_GRACEFUL_RESTART_HELPER) |
3046 | ? "Set" | |
3047 | : "UnSet")); | |
794b37d5 | 3048 | if (CHECK_FLAG(peer->peer_gr_new_status_flag, |
36235319 QY |
3049 | PEER_GRACEFUL_RESTART_NEW_STATE_RESTART)) |
3050 | SET_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART); | |
794b37d5 | 3051 | else |
36235319 | 3052 | UNSET_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART); |
794b37d5 | 3053 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
3054 | zlog_debug( | |
2ba1fe69 | 3055 | "[BGP_GR] Peer %s Flag PEER_FLAG_GRACEFUL_RESTART : %s : !", |
794b37d5 | 3056 | peer->host, |
36235319 QY |
3057 | (CHECK_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART) |
3058 | ? "Set" | |
3059 | : "UnSet")); | |
794b37d5 | 3060 | if (CHECK_FLAG(peer->peer_gr_new_status_flag, |
36235319 | 3061 | PEER_GRACEFUL_RESTART_NEW_STATE_INHERIT)) |
2986cac2 | 3062 | SET_FLAG(peer->flags, |
36235319 | 3063 | PEER_FLAG_GRACEFUL_RESTART_GLOBAL_INHERIT); |
794b37d5 | 3064 | else |
2986cac2 | 3065 | UNSET_FLAG(peer->flags, |
36235319 | 3066 | PEER_FLAG_GRACEFUL_RESTART_GLOBAL_INHERIT); |
794b37d5 | 3067 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
3068 | zlog_debug( | |
36235319 | 3069 | "[BGP_GR] Peer %s Flag PEER_FLAG_GRACEFUL_RESTART_GLOBAL_INHERIT : %s : !", |
794b37d5 | 3070 | peer->host, |
2986cac2 | 3071 | (CHECK_FLAG(peer->flags, |
36235319 QY |
3072 | PEER_FLAG_GRACEFUL_RESTART_GLOBAL_INHERIT) |
3073 | ? "Set" | |
3074 | : "UnSet")); | |
d7b3cda6 | 3075 | |
36235319 QY |
3076 | if (!CHECK_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART) |
3077 | && !CHECK_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART_HELPER)) { | |
3078 | zlog_debug("[BGP_GR] Peer %s UNSET PEER_STATUS_NSF_MODE!", | |
3079 | peer->host); | |
d7b3cda6 | 3080 | |
3081 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
3082 | ||
36235319 | 3083 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { |
d7b3cda6 | 3084 | |
3085 | peer_nsf_stop(peer); | |
3086 | zlog_debug( | |
2ba1fe69 | 3087 | "[BGP_GR] Peer %s UNSET PEER_STATUS_NSF_WAIT!", |
d7b3cda6 | 3088 | peer->host); |
3089 | } | |
3090 | } | |
794b37d5 | 3091 | } |