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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 | |
4da144f3 DS |
64 | enum bgp_fsm_state_progress { |
65 | BGP_FSM_FAILURE_AND_DELETE = -2, | |
66 | BGP_FSM_FAILURE = -1, | |
67 | BGP_FSM_SUCCESS = 0, | |
68 | BGP_FSM_SUCCESS_STATE_TRANSFER = 1, | |
69 | }; | |
70 | ||
6403814c DS |
71 | /* Definition of display strings corresponding to FSM events. This should be |
72 | * kept consistent with the events defined in bgpd.h | |
73 | */ | |
2b64873d | 74 | static const char *const bgp_event_str[] = { |
d62a17ae | 75 | NULL, |
76 | "BGP_Start", | |
77 | "BGP_Stop", | |
78 | "TCP_connection_open", | |
6c537a18 | 79 | "TCP_connection_open_w_delay", |
d62a17ae | 80 | "TCP_connection_closed", |
81 | "TCP_connection_open_failed", | |
82 | "TCP_fatal_error", | |
83 | "ConnectRetry_timer_expired", | |
84 | "Hold_Timer_expired", | |
85 | "KeepAlive_timer_expired", | |
6c537a18 | 86 | "DelayOpen_timer_expired", |
d62a17ae | 87 | "Receive_OPEN_message", |
88 | "Receive_KEEPALIVE_message", | |
89 | "Receive_UPDATE_message", | |
90 | "Receive_NOTIFICATION_message", | |
91 | "Clearing_Completed", | |
6403814c DS |
92 | }; |
93 | ||
718e3744 | 94 | /* BGP FSM (finite state machine) has three types of functions. Type |
95 | one is thread functions. Type two is event functions. Type three | |
96 | is FSM functions. Timer functions are set by bgp_timer_set | |
97 | function. */ | |
98 | ||
99 | /* BGP event function. */ | |
cc9f21da | 100 | void bgp_event(struct thread *); |
718e3744 | 101 | |
102 | /* BGP thread functions. */ | |
cc9f21da DS |
103 | static void bgp_start_timer(struct thread *); |
104 | static void bgp_connect_timer(struct thread *); | |
105 | static void bgp_holdtime_timer(struct thread *); | |
106 | static void bgp_delayopen_timer(struct thread *); | |
718e3744 | 107 | |
108 | /* BGP FSM functions. */ | |
4da144f3 | 109 | static enum bgp_fsm_state_progress bgp_start(struct peer *); |
718e3744 | 110 | |
e2d3a909 | 111 | /* Register peer with NHT */ |
996319e6 | 112 | int bgp_peer_reg_with_nht(struct peer *peer) |
e2d3a909 | 113 | { |
114 | int connected = 0; | |
115 | ||
c8d6f0d6 | 116 | if (peer->sort == BGP_PEER_EBGP && peer->ttl == BGP_DEFAULT_TTL |
e2d3a909 | 117 | && !CHECK_FLAG(peer->flags, PEER_FLAG_DISABLE_CONNECTED_CHECK) |
892fedb6 | 118 | && !CHECK_FLAG(peer->bgp->flags, BGP_FLAG_DISABLE_NH_CONNECTED_CHK)) |
e2d3a909 | 119 | connected = 1; |
120 | ||
654a5978 PG |
121 | return bgp_find_or_add_nexthop( |
122 | peer->bgp, peer->bgp, family2afi(peer->su.sa.sa_family), | |
123 | SAFI_UNICAST, NULL, peer, connected, NULL); | |
e2d3a909 | 124 | } |
125 | ||
d62a17ae | 126 | static void peer_xfer_stats(struct peer *peer_dst, struct peer *peer_src) |
1ff9a340 | 127 | { |
d62a17ae | 128 | /* Copy stats over. These are only the pre-established state stats */ |
129 | peer_dst->open_in += peer_src->open_in; | |
130 | peer_dst->open_out += peer_src->open_out; | |
131 | peer_dst->keepalive_in += peer_src->keepalive_in; | |
132 | peer_dst->keepalive_out += peer_src->keepalive_out; | |
133 | peer_dst->notify_in += peer_src->notify_in; | |
134 | peer_dst->notify_out += peer_src->notify_out; | |
135 | peer_dst->dynamic_cap_in += peer_src->dynamic_cap_in; | |
136 | peer_dst->dynamic_cap_out += peer_src->dynamic_cap_out; | |
1ff9a340 DS |
137 | } |
138 | ||
d62a17ae | 139 | static struct peer *peer_xfer_conn(struct peer *from_peer) |
1ff9a340 | 140 | { |
d62a17ae | 141 | struct peer *peer; |
142 | afi_t afi; | |
143 | safi_t safi; | |
144 | int fd; | |
8398b5d5 | 145 | enum bgp_fsm_status status, pstatus; |
d1060698 | 146 | enum bgp_fsm_events last_evt, last_maj_evt; |
d62a17ae | 147 | |
148 | assert(from_peer != NULL); | |
149 | ||
150 | peer = from_peer->doppelganger; | |
151 | ||
152 | if (!peer || !CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE)) | |
153 | return from_peer; | |
154 | ||
9bf904cc DS |
155 | /* |
156 | * Let's check that we are not going to loose known configuration | |
157 | * state based upon doppelganger rules. | |
158 | */ | |
159 | FOREACH_AFI_SAFI (afi, safi) { | |
160 | if (from_peer->afc[afi][safi] != peer->afc[afi][safi]) { | |
161 | flog_err( | |
162 | EC_BGP_DOPPELGANGER_CONFIG, | |
163 | "from_peer->afc[%d][%d] is not the same as what we are overwriting", | |
164 | afi, safi); | |
165 | return NULL; | |
166 | } | |
167 | } | |
168 | ||
d62a17ae | 169 | if (bgp_debug_neighbor_events(peer)) |
170 | zlog_debug("%s: peer transfer %p fd %d -> %p fd %d)", | |
171 | from_peer->host, from_peer, from_peer->fd, peer, | |
172 | peer->fd); | |
173 | ||
424ab01d QY |
174 | bgp_writes_off(peer); |
175 | bgp_reads_off(peer); | |
176 | bgp_writes_off(from_peer); | |
177 | bgp_reads_off(from_peer); | |
d62a17ae | 178 | |
74e00a55 S |
179 | /* |
180 | * Before exchanging FD remove doppelganger from | |
181 | * keepalive peer hash. It could be possible conf peer | |
182 | * fd is set to -1. If blocked on lock then keepalive | |
183 | * thread can access peer pointer with fd -1. | |
184 | */ | |
185 | bgp_keepalives_off(from_peer); | |
186 | ||
fa5806c3 DS |
187 | THREAD_OFF(peer->t_routeadv); |
188 | THREAD_OFF(peer->t_connect); | |
189 | THREAD_OFF(peer->t_delayopen); | |
190 | THREAD_OFF(peer->t_connect_check_r); | |
191 | THREAD_OFF(peer->t_connect_check_w); | |
192 | THREAD_OFF(from_peer->t_routeadv); | |
193 | THREAD_OFF(from_peer->t_connect); | |
194 | THREAD_OFF(from_peer->t_delayopen); | |
195 | THREAD_OFF(from_peer->t_connect_check_r); | |
196 | THREAD_OFF(from_peer->t_connect_check_w); | |
197 | THREAD_OFF(from_peer->t_process_packet); | |
d3ecc69e | 198 | |
becedef6 QY |
199 | /* |
200 | * At this point in time, it is possible that there are packets pending | |
201 | * on various buffers. Those need to be transferred or dropped, | |
202 | * otherwise we'll get spurious failures during session establishment. | |
203 | */ | |
cb1991af | 204 | frr_with_mutex (&peer->io_mtx, &from_peer->io_mtx) { |
424ab01d QY |
205 | fd = peer->fd; |
206 | peer->fd = from_peer->fd; | |
207 | from_peer->fd = fd; | |
208 | ||
209 | stream_fifo_clean(peer->ibuf); | |
d3ecc69e | 210 | stream_fifo_clean(peer->obuf); |
d3ecc69e | 211 | |
becedef6 QY |
212 | /* |
213 | * this should never happen, since bgp_process_packet() is the | |
214 | * only task that sets and unsets the current packet and it | |
215 | * runs in our pthread. | |
216 | */ | |
424ab01d | 217 | if (peer->curr) { |
af4c2728 | 218 | flog_err( |
e50f7cfd | 219 | EC_BGP_PKT_PROCESS, |
424ab01d QY |
220 | "[%s] Dropping pending packet on connection transfer:", |
221 | peer->host); | |
584470fb DL |
222 | /* there used to be a bgp_packet_dump call here, but |
223 | * that's extremely confusing since there's no way to | |
224 | * identify the packet in MRT dumps or BMP as dropped | |
225 | * due to connection transfer. | |
226 | */ | |
424ab01d QY |
227 | stream_free(peer->curr); |
228 | peer->curr = NULL; | |
229 | } | |
230 | ||
231 | // copy each packet from old peer's output queue to new peer | |
727c4f87 QY |
232 | while (from_peer->obuf->head) |
233 | stream_fifo_push(peer->obuf, | |
234 | stream_fifo_pop(from_peer->obuf)); | |
424ab01d QY |
235 | |
236 | // copy each packet from old peer's input queue to new peer | |
237 | while (from_peer->ibuf->head) | |
238 | stream_fifo_push(peer->ibuf, | |
239 | stream_fifo_pop(from_peer->ibuf)); | |
7db44ec8 | 240 | |
74ffbfe6 QY |
241 | ringbuf_wipe(peer->ibuf_work); |
242 | ringbuf_copy(peer->ibuf_work, from_peer->ibuf_work, | |
243 | ringbuf_remain(from_peer->ibuf_work)); | |
d3ecc69e | 244 | } |
d62a17ae | 245 | |
246 | peer->as = from_peer->as; | |
247 | peer->v_holdtime = from_peer->v_holdtime; | |
248 | peer->v_keepalive = from_peer->v_keepalive; | |
d62a17ae | 249 | peer->v_routeadv = from_peer->v_routeadv; |
6c537a18 | 250 | peer->v_delayopen = from_peer->v_delayopen; |
d62a17ae | 251 | peer->v_gr_restart = from_peer->v_gr_restart; |
252 | peer->cap = from_peer->cap; | |
8f2d6021 | 253 | peer->remote_role = from_peer->remote_role; |
d62a17ae | 254 | status = peer->status; |
255 | pstatus = peer->ostatus; | |
256 | last_evt = peer->last_event; | |
257 | last_maj_evt = peer->last_major_event; | |
258 | peer->status = from_peer->status; | |
259 | peer->ostatus = from_peer->ostatus; | |
260 | peer->last_event = from_peer->last_event; | |
261 | peer->last_major_event = from_peer->last_major_event; | |
262 | from_peer->status = status; | |
263 | from_peer->ostatus = pstatus; | |
264 | from_peer->last_event = last_evt; | |
265 | from_peer->last_major_event = last_maj_evt; | |
266 | peer->remote_id = from_peer->remote_id; | |
3577f1c5 | 267 | peer->last_reset = from_peer->last_reset; |
0db06e37 | 268 | peer->max_packet_size = from_peer->max_packet_size; |
d62a17ae | 269 | |
36235319 QY |
270 | BGP_GR_ROUTER_DETECT_AND_SEND_CAPABILITY_TO_ZEBRA(peer->bgp, |
271 | peer->bgp->peer); | |
8c48b3b6 | 272 | |
d7b3cda6 | 273 | if (bgp_peer_gr_mode_get(peer) == PEER_DISABLE) { |
274 | ||
275 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
276 | ||
36235319 | 277 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { |
d7b3cda6 | 278 | peer_nsf_stop(peer); |
279 | } | |
280 | } | |
281 | ||
d62a17ae | 282 | if (from_peer->hostname != NULL) { |
283 | if (peer->hostname) { | |
284 | XFREE(MTYPE_BGP_PEER_HOST, peer->hostname); | |
285 | peer->hostname = NULL; | |
286 | } | |
287 | ||
288 | peer->hostname = from_peer->hostname; | |
289 | from_peer->hostname = NULL; | |
290 | } | |
291 | ||
292 | if (from_peer->domainname != NULL) { | |
293 | if (peer->domainname) { | |
294 | XFREE(MTYPE_BGP_PEER_HOST, peer->domainname); | |
295 | peer->domainname = NULL; | |
296 | } | |
297 | ||
298 | peer->domainname = from_peer->domainname; | |
299 | from_peer->domainname = NULL; | |
300 | } | |
301 | ||
05c7a1cc | 302 | FOREACH_AFI_SAFI (afi, safi) { |
05c7a1cc QY |
303 | peer->af_sflags[afi][safi] = from_peer->af_sflags[afi][safi]; |
304 | peer->af_cap[afi][safi] = from_peer->af_cap[afi][safi]; | |
305 | peer->afc_nego[afi][safi] = from_peer->afc_nego[afi][safi]; | |
306 | peer->afc_adv[afi][safi] = from_peer->afc_adv[afi][safi]; | |
307 | peer->afc_recv[afi][safi] = from_peer->afc_recv[afi][safi]; | |
308 | peer->orf_plist[afi][safi] = from_peer->orf_plist[afi][safi]; | |
1479ed2f | 309 | peer->llgr[afi][safi] = from_peer->llgr[afi][safi]; |
05c7a1cc | 310 | } |
d62a17ae | 311 | |
312 | if (bgp_getsockname(peer) < 0) { | |
af4c2728 | 313 | flog_err( |
450971aa | 314 | EC_LIB_SOCKET, |
d62a17ae | 315 | "%%bgp_getsockname() failed for %s peer %s fd %d (from_peer fd %d)", |
316 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER) | |
317 | ? "accept" | |
318 | : ""), | |
319 | peer->host, peer->fd, from_peer->fd); | |
6c4d8732 SP |
320 | BGP_EVENT_ADD(peer, BGP_Stop); |
321 | BGP_EVENT_ADD(from_peer, BGP_Stop); | |
d62a17ae | 322 | return NULL; |
323 | } | |
324 | if (from_peer->status > Active) { | |
325 | if (bgp_getsockname(from_peer) < 0) { | |
af4c2728 | 326 | flog_err( |
450971aa | 327 | EC_LIB_SOCKET, |
d62a17ae | 328 | "%%bgp_getsockname() failed for %s from_peer %s fd %d (peer fd %d)", |
14454c9f | 329 | |
d62a17ae | 330 | (CHECK_FLAG(from_peer->sflags, |
331 | PEER_STATUS_ACCEPT_PEER) | |
332 | ? "accept" | |
333 | : ""), | |
334 | from_peer->host, from_peer->fd, peer->fd); | |
335 | bgp_stop(from_peer); | |
336 | from_peer = NULL; | |
337 | } | |
338 | } | |
339 | ||
0112e9e0 QY |
340 | |
341 | // Note: peer_xfer_stats() must be called with I/O turned OFF | |
342 | if (from_peer) | |
343 | peer_xfer_stats(peer, from_peer); | |
344 | ||
e2d3a909 | 345 | /* Register peer for NHT. This is to allow RAs to be enabled when |
346 | * needed, even on a passive connection. | |
347 | */ | |
348 | bgp_peer_reg_with_nht(peer); | |
996319e6 DS |
349 | if (from_peer) |
350 | bgp_replace_nexthop_by_peer(from_peer, peer); | |
e2d3a909 | 351 | |
424ab01d QY |
352 | bgp_reads_on(peer); |
353 | bgp_writes_on(peer); | |
e0d550df MS |
354 | thread_add_event(bm->master, bgp_process_packet, peer, 0, |
355 | &peer->t_process_packet); | |
d62a17ae | 356 | |
d62a17ae | 357 | return (peer); |
1ff9a340 DS |
358 | } |
359 | ||
718e3744 | 360 | /* Hook function called after bgp event is occered. And vty's |
361 | neighbor command invoke this function after making neighbor | |
362 | structure. */ | |
d62a17ae | 363 | void bgp_timer_set(struct peer *peer) |
718e3744 | 364 | { |
1479ed2f DA |
365 | afi_t afi; |
366 | safi_t safi; | |
367 | ||
d62a17ae | 368 | switch (peer->status) { |
369 | case Idle: | |
370 | /* First entry point of peer's finite state machine. In Idle | |
371 | status start timer is on unless peer is shutdown or peer is | |
372 | inactive. All other timer must be turned off */ | |
f62abc7d | 373 | if (BGP_PEER_START_SUPPRESSED(peer) || !peer_active(peer) |
2c1eba8e | 374 | || peer->bgp->vrf_id == VRF_UNKNOWN) { |
fa5806c3 | 375 | THREAD_OFF(peer->t_start); |
d62a17ae | 376 | } else { |
377 | BGP_TIMER_ON(peer->t_start, bgp_start_timer, | |
378 | peer->v_start); | |
379 | } | |
fa5806c3 DS |
380 | THREAD_OFF(peer->t_connect); |
381 | THREAD_OFF(peer->t_holdtime); | |
b72b6f4f | 382 | bgp_keepalives_off(peer); |
fa5806c3 DS |
383 | THREAD_OFF(peer->t_routeadv); |
384 | THREAD_OFF(peer->t_delayopen); | |
d62a17ae | 385 | break; |
386 | ||
387 | case Connect: | |
388 | /* After start timer is expired, the peer moves to Connect | |
389 | status. Make sure start timer is off and connect timer is | |
390 | on. */ | |
fa5806c3 | 391 | THREAD_OFF(peer->t_start); |
6c537a18 DS |
392 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER_DELAYOPEN)) |
393 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
394 | (peer->v_delayopen + peer->v_connect)); | |
395 | else | |
396 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
397 | peer->v_connect); | |
398 | ||
fa5806c3 | 399 | THREAD_OFF(peer->t_holdtime); |
b72b6f4f | 400 | bgp_keepalives_off(peer); |
fa5806c3 | 401 | THREAD_OFF(peer->t_routeadv); |
d62a17ae | 402 | break; |
403 | ||
404 | case Active: | |
405 | /* Active is waiting connection from remote peer. And if | |
406 | connect timer is expired, change status to Connect. */ | |
fa5806c3 | 407 | THREAD_OFF(peer->t_start); |
d62a17ae | 408 | /* If peer is passive mode, do not set connect timer. */ |
409 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE) | |
410 | || CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
fa5806c3 | 411 | THREAD_OFF(peer->t_connect); |
d62a17ae | 412 | } else { |
6c537a18 DS |
413 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER_DELAYOPEN)) |
414 | BGP_TIMER_ON( | |
415 | peer->t_connect, bgp_connect_timer, | |
416 | (peer->v_delayopen + peer->v_connect)); | |
417 | else | |
418 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
419 | peer->v_connect); | |
d62a17ae | 420 | } |
fa5806c3 | 421 | THREAD_OFF(peer->t_holdtime); |
b72b6f4f | 422 | bgp_keepalives_off(peer); |
fa5806c3 | 423 | THREAD_OFF(peer->t_routeadv); |
d62a17ae | 424 | break; |
425 | ||
426 | case OpenSent: | |
427 | /* OpenSent status. */ | |
fa5806c3 DS |
428 | THREAD_OFF(peer->t_start); |
429 | THREAD_OFF(peer->t_connect); | |
d62a17ae | 430 | if (peer->v_holdtime != 0) { |
431 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
432 | peer->v_holdtime); | |
433 | } else { | |
fa5806c3 | 434 | THREAD_OFF(peer->t_holdtime); |
d62a17ae | 435 | } |
b72b6f4f | 436 | bgp_keepalives_off(peer); |
fa5806c3 DS |
437 | THREAD_OFF(peer->t_routeadv); |
438 | THREAD_OFF(peer->t_delayopen); | |
d62a17ae | 439 | break; |
440 | ||
441 | case OpenConfirm: | |
442 | /* OpenConfirm status. */ | |
fa5806c3 DS |
443 | THREAD_OFF(peer->t_start); |
444 | THREAD_OFF(peer->t_connect); | |
d62a17ae | 445 | |
446 | /* If the negotiated Hold Time value is zero, then the Hold Time | |
447 | timer and KeepAlive timers are not started. */ | |
448 | if (peer->v_holdtime == 0) { | |
fa5806c3 | 449 | THREAD_OFF(peer->t_holdtime); |
b72b6f4f | 450 | bgp_keepalives_off(peer); |
d62a17ae | 451 | } else { |
452 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
453 | peer->v_holdtime); | |
b72b6f4f | 454 | bgp_keepalives_on(peer); |
d62a17ae | 455 | } |
fa5806c3 DS |
456 | THREAD_OFF(peer->t_routeadv); |
457 | THREAD_OFF(peer->t_delayopen); | |
d62a17ae | 458 | break; |
459 | ||
460 | case Established: | |
461 | /* In Established status start and connect timer is turned | |
462 | off. */ | |
fa5806c3 DS |
463 | THREAD_OFF(peer->t_start); |
464 | THREAD_OFF(peer->t_connect); | |
465 | THREAD_OFF(peer->t_delayopen); | |
d62a17ae | 466 | |
467 | /* Same as OpenConfirm, if holdtime is zero then both holdtime | |
468 | and keepalive must be turned off. */ | |
469 | if (peer->v_holdtime == 0) { | |
fa5806c3 | 470 | THREAD_OFF(peer->t_holdtime); |
bea01226 | 471 | bgp_keepalives_off(peer); |
d62a17ae | 472 | } else { |
473 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
474 | peer->v_holdtime); | |
bea01226 | 475 | bgp_keepalives_on(peer); |
d62a17ae | 476 | } |
477 | break; | |
478 | case Deleted: | |
fa5806c3 DS |
479 | THREAD_OFF(peer->t_gr_restart); |
480 | THREAD_OFF(peer->t_gr_stale); | |
1479ed2f DA |
481 | |
482 | FOREACH_AFI_SAFI (afi, safi) | |
fa5806c3 | 483 | THREAD_OFF(peer->t_llgr_stale[afi][safi]); |
1479ed2f | 484 | |
fa5806c3 DS |
485 | THREAD_OFF(peer->t_pmax_restart); |
486 | THREAD_OFF(peer->t_refresh_stalepath); | |
d62a17ae | 487 | /* fallthru */ |
488 | case Clearing: | |
fa5806c3 DS |
489 | THREAD_OFF(peer->t_start); |
490 | THREAD_OFF(peer->t_connect); | |
491 | THREAD_OFF(peer->t_holdtime); | |
b72b6f4f | 492 | bgp_keepalives_off(peer); |
fa5806c3 DS |
493 | THREAD_OFF(peer->t_routeadv); |
494 | THREAD_OFF(peer->t_delayopen); | |
d62a17ae | 495 | break; |
8398b5d5 DS |
496 | case BGP_STATUS_MAX: |
497 | flog_err(EC_LIB_DEVELOPMENT, | |
498 | "BGP_STATUS_MAX while a legal state is not valid state for the FSM"); | |
499 | break; | |
718e3744 | 500 | } |
718e3744 | 501 | } |
502 | ||
503 | /* BGP start timer. This function set BGP_Start event to thread value | |
504 | and process event. */ | |
cc9f21da | 505 | static void bgp_start_timer(struct thread *thread) |
718e3744 | 506 | { |
d62a17ae | 507 | struct peer *peer; |
718e3744 | 508 | |
d62a17ae | 509 | peer = THREAD_ARG(thread); |
718e3744 | 510 | |
d62a17ae | 511 | if (bgp_debug_neighbor_events(peer)) |
512 | zlog_debug("%s [FSM] Timer (start timer expire).", peer->host); | |
718e3744 | 513 | |
d62a17ae | 514 | THREAD_VAL(thread) = BGP_Start; |
515 | bgp_event(thread); /* bgp_event unlocks peer */ | |
718e3744 | 516 | } |
517 | ||
518 | /* BGP connect retry timer. */ | |
cc9f21da | 519 | static void bgp_connect_timer(struct thread *thread) |
718e3744 | 520 | { |
d62a17ae | 521 | struct peer *peer; |
d62a17ae | 522 | |
523 | peer = THREAD_ARG(thread); | |
424ab01d | 524 | |
6c537a18 | 525 | /* stop the DelayOpenTimer if it is running */ |
fa5806c3 | 526 | THREAD_OFF(peer->t_delayopen); |
6c537a18 | 527 | |
424ab01d QY |
528 | assert(!peer->t_write); |
529 | assert(!peer->t_read); | |
530 | ||
d62a17ae | 531 | if (bgp_debug_neighbor_events(peer)) |
532 | zlog_debug("%s [FSM] Timer (connect timer expire)", peer->host); | |
533 | ||
cc9f21da | 534 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
d62a17ae | 535 | bgp_stop(peer); |
cc9f21da | 536 | else { |
d62a17ae | 537 | THREAD_VAL(thread) = ConnectRetry_timer_expired; |
538 | bgp_event(thread); /* bgp_event unlocks peer */ | |
d62a17ae | 539 | } |
718e3744 | 540 | } |
541 | ||
542 | /* BGP holdtime timer. */ | |
cc9f21da | 543 | static void bgp_holdtime_timer(struct thread *thread) |
718e3744 | 544 | { |
d0874d19 | 545 | atomic_size_t inq_count; |
d62a17ae | 546 | struct peer *peer; |
718e3744 | 547 | |
d62a17ae | 548 | peer = THREAD_ARG(thread); |
718e3744 | 549 | |
d62a17ae | 550 | if (bgp_debug_neighbor_events(peer)) |
551 | zlog_debug("%s [FSM] Timer (holdtime timer expire)", | |
552 | peer->host); | |
718e3744 | 553 | |
d0874d19 DS |
554 | /* |
555 | * Given that we do not have any expectation of ordering | |
556 | * for handling packets from a peer -vs- handling | |
557 | * the hold timer for a peer as that they are both | |
558 | * events on the peer. If we have incoming | |
559 | * data on the peers inq, let's give the system a chance | |
560 | * to handle that data. This can be especially true | |
561 | * for systems where we are heavily loaded for one | |
562 | * reason or another. | |
563 | */ | |
564 | inq_count = atomic_load_explicit(&peer->ibuf->count, | |
565 | memory_order_relaxed); | |
cc9f21da | 566 | if (inq_count) |
d0874d19 DS |
567 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, |
568 | peer->v_holdtime); | |
569 | ||
d62a17ae | 570 | THREAD_VAL(thread) = Hold_Timer_expired; |
571 | bgp_event(thread); /* bgp_event unlocks peer */ | |
718e3744 | 572 | } |
573 | ||
cc9f21da | 574 | void bgp_routeadv_timer(struct thread *thread) |
718e3744 | 575 | { |
d62a17ae | 576 | struct peer *peer; |
718e3744 | 577 | |
d62a17ae | 578 | peer = THREAD_ARG(thread); |
718e3744 | 579 | |
d62a17ae | 580 | if (bgp_debug_neighbor_events(peer)) |
581 | zlog_debug("%s [FSM] Timer (routeadv timer expire)", | |
582 | peer->host); | |
718e3744 | 583 | |
083ec940 | 584 | peer->synctime = monotime(NULL); |
718e3744 | 585 | |
a9794991 | 586 | thread_add_timer_msec(bm->master, bgp_generate_updgrp_packets, peer, 0, |
424ab01d QY |
587 | &peer->t_generate_updgrp_packets); |
588 | ||
d62a17ae | 589 | /* MRAI timer will be started again when FIFO is built, no need to |
590 | * do it here. | |
591 | */ | |
718e3744 | 592 | } |
593 | ||
6c537a18 | 594 | /* RFC 4271 DelayOpenTimer */ |
cc9f21da | 595 | void bgp_delayopen_timer(struct thread *thread) |
6c537a18 DS |
596 | { |
597 | struct peer *peer; | |
598 | ||
599 | peer = THREAD_ARG(thread); | |
600 | ||
601 | if (bgp_debug_neighbor_events(peer)) | |
602 | zlog_debug("%s [FSM] Timer (DelayOpentimer expire)", | |
603 | peer->host); | |
604 | ||
605 | THREAD_VAL(thread) = DelayOpen_timer_expired; | |
606 | bgp_event(thread); /* bgp_event unlocks peer */ | |
6c537a18 DS |
607 | } |
608 | ||
e0701b79 | 609 | /* BGP Peer Down Cause */ |
2b64873d | 610 | const char *const peer_down_str[] = {"", |
6029afbc DS |
611 | "Router ID changed", |
612 | "Remote AS changed", | |
613 | "Local AS change", | |
614 | "Cluster ID changed", | |
615 | "Confederation identifier changed", | |
616 | "Confederation peer changed", | |
617 | "RR client config change", | |
618 | "RS client config change", | |
619 | "Update source change", | |
620 | "Address family activated", | |
621 | "Admin. shutdown", | |
622 | "User reset", | |
623 | "BGP Notification received", | |
624 | "BGP Notification send", | |
625 | "Peer closed the session", | |
626 | "Neighbor deleted", | |
627 | "Peer-group add member", | |
628 | "Peer-group delete member", | |
629 | "Capability changed", | |
630 | "Passive config change", | |
631 | "Multihop config change", | |
632 | "NSF peer closed the session", | |
633 | "Intf peering v6only config change", | |
634 | "BFD down received", | |
635 | "Interface down", | |
636 | "Neighbor address lost", | |
637 | "No path to specified Neighbor", | |
638 | "Waiting for Peer IPv6 LLA", | |
639 | "Waiting for VRF to be initialized", | |
640 | "No AFI/SAFI activated for peer", | |
641 | "AS Set config change", | |
642 | "Waiting for peer OPEN", | |
643 | "Reached received prefix count", | |
5597214c DA |
644 | "Socket Error", |
645 | "Admin. shutdown (RTT)"}; | |
d62a17ae | 646 | |
1479ed2f | 647 | static void bgp_graceful_restart_timer_off(struct peer *peer) |
e0701b79 | 648 | { |
d62a17ae | 649 | afi_t afi; |
650 | safi_t safi; | |
651 | ||
1479ed2f DA |
652 | FOREACH_AFI_SAFI (afi, safi) |
653 | if (CHECK_FLAG(peer->af_sflags[afi][safi], | |
654 | PEER_STATUS_LLGR_WAIT)) | |
655 | return; | |
d62a17ae | 656 | |
657 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
fa5806c3 | 658 | THREAD_OFF(peer->t_gr_stale); |
af8496af DA |
659 | |
660 | if (peer_dynamic_neighbor(peer) && | |
661 | !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
662 | if (bgp_debug_neighbor_events(peer)) | |
31afff83 DA |
663 | zlog_debug("%s (dynamic neighbor) deleted (%s)", |
664 | peer->host, __func__); | |
af8496af DA |
665 | peer_delete(peer); |
666 | } | |
667 | ||
1479ed2f DA |
668 | bgp_timer_set(peer); |
669 | } | |
670 | ||
cc9f21da | 671 | static void bgp_llgr_stale_timer_expire(struct thread *thread) |
1479ed2f DA |
672 | { |
673 | struct peer_af *paf; | |
674 | struct peer *peer; | |
675 | afi_t afi; | |
676 | safi_t safi; | |
677 | ||
678 | paf = THREAD_ARG(thread); | |
679 | ||
680 | peer = paf->peer; | |
681 | afi = paf->afi; | |
682 | safi = paf->safi; | |
683 | ||
684 | /* If the timer for the "Long-lived Stale Time" expires before the | |
685 | * session is re-established, the helper MUST delete all the | |
686 | * stale routes from the neighbor that it is retaining. | |
687 | */ | |
688 | if (bgp_debug_neighbor_events(peer)) | |
f70c91dc | 689 | zlog_debug("%pBP Long-lived stale timer (%s) expired", peer, |
1479ed2f DA |
690 | get_afi_safi_str(afi, safi, false)); |
691 | ||
692 | UNSET_FLAG(peer->af_sflags[afi][safi], PEER_STATUS_LLGR_WAIT); | |
693 | ||
694 | bgp_clear_stale_route(peer, afi, safi); | |
695 | ||
696 | bgp_graceful_restart_timer_off(peer); | |
1479ed2f DA |
697 | } |
698 | ||
699 | static void bgp_set_llgr_stale(struct peer *peer, afi_t afi, safi_t safi) | |
700 | { | |
701 | struct bgp_dest *dest; | |
702 | struct bgp_path_info *pi; | |
703 | struct bgp_table *table; | |
704 | struct attr attr; | |
705 | ||
706 | if (safi == SAFI_MPLS_VPN || safi == SAFI_ENCAP || safi == SAFI_EVPN) { | |
707 | for (dest = bgp_table_top(peer->bgp->rib[afi][safi]); dest; | |
708 | dest = bgp_route_next(dest)) { | |
709 | struct bgp_dest *rm; | |
710 | ||
711 | table = bgp_dest_get_bgp_table_info(dest); | |
712 | if (!table) | |
713 | continue; | |
714 | ||
715 | for (rm = bgp_table_top(table); rm; | |
716 | rm = bgp_route_next(rm)) | |
717 | for (pi = bgp_dest_get_bgp_path_info(rm); pi; | |
718 | pi = pi->next) { | |
719 | if (pi->peer != peer) | |
720 | continue; | |
721 | ||
9a706b42 | 722 | if (bgp_attr_get_community(pi->attr) && |
1479ed2f | 723 | community_include( |
9a706b42 DA |
724 | bgp_attr_get_community( |
725 | pi->attr), | |
1479ed2f DA |
726 | COMMUNITY_NO_LLGR)) |
727 | continue; | |
728 | ||
729 | if (bgp_debug_neighbor_events(peer)) | |
730 | zlog_debug( | |
f70c91dc DA |
731 | "%pBP Long-lived set stale community (LLGR_STALE) for: %pFX", |
732 | peer, &dest->p); | |
1479ed2f DA |
733 | |
734 | attr = *pi->attr; | |
735 | bgp_attr_add_llgr_community(&attr); | |
736 | pi->attr = bgp_attr_intern(&attr); | |
737 | bgp_recalculate_afi_safi_bestpaths( | |
738 | peer->bgp, afi, safi); | |
739 | ||
740 | break; | |
741 | } | |
742 | } | |
743 | } else { | |
744 | for (dest = bgp_table_top(peer->bgp->rib[afi][safi]); dest; | |
745 | dest = bgp_route_next(dest)) | |
746 | for (pi = bgp_dest_get_bgp_path_info(dest); pi; | |
747 | pi = pi->next) { | |
748 | if (pi->peer != peer) | |
749 | continue; | |
750 | ||
9a706b42 DA |
751 | if (bgp_attr_get_community(pi->attr) && |
752 | community_include( | |
753 | bgp_attr_get_community(pi->attr), | |
754 | COMMUNITY_NO_LLGR)) | |
1479ed2f DA |
755 | continue; |
756 | ||
757 | if (bgp_debug_neighbor_events(peer)) | |
758 | zlog_debug( | |
f70c91dc DA |
759 | "%pBP Long-lived set stale community (LLGR_STALE) for: %pFX", |
760 | peer, &dest->p); | |
1479ed2f DA |
761 | |
762 | attr = *pi->attr; | |
763 | bgp_attr_add_llgr_community(&attr); | |
764 | pi->attr = bgp_attr_intern(&attr); | |
765 | bgp_recalculate_afi_safi_bestpaths(peer->bgp, | |
766 | afi, safi); | |
767 | ||
768 | break; | |
769 | } | |
770 | } | |
771 | } | |
772 | ||
cc9f21da | 773 | static void bgp_graceful_restart_timer_expire(struct thread *thread) |
1479ed2f DA |
774 | { |
775 | struct peer *peer, *tmp_peer; | |
776 | struct listnode *node, *nnode; | |
777 | struct peer_af *paf; | |
778 | afi_t afi; | |
779 | safi_t safi; | |
780 | ||
781 | peer = THREAD_ARG(thread); | |
d62a17ae | 782 | |
783 | if (bgp_debug_neighbor_events(peer)) { | |
f70c91dc DA |
784 | zlog_debug("%pBP graceful restart timer expired", peer); |
785 | zlog_debug("%pBP graceful restart stalepath timer stopped", | |
786 | peer); | |
d62a17ae | 787 | } |
93406d87 | 788 | |
1479ed2f DA |
789 | FOREACH_AFI_SAFI (afi, safi) { |
790 | if (!peer->nsf[afi][safi]) | |
791 | continue; | |
792 | ||
793 | /* Once the "Restart Time" period ends, the LLGR period is | |
794 | * said to have begun and the following procedures MUST be | |
795 | * performed: | |
796 | * | |
797 | * The helper router MUST start a timer for the | |
798 | * "Long-lived Stale Time". | |
799 | * | |
800 | * The helper router MUST attach the LLGR_STALE community | |
801 | * for the stale routes being retained. Note that this | |
802 | * requirement implies that the routes would need to be | |
803 | * readvertised, to disseminate the modified community. | |
804 | */ | |
805 | if (peer->llgr[afi][safi].stale_time) { | |
806 | paf = peer_af_find(peer, afi, safi); | |
807 | if (!paf) | |
808 | continue; | |
809 | ||
810 | if (bgp_debug_neighbor_events(peer)) | |
811 | zlog_debug( | |
f70c91dc DA |
812 | "%pBP Long-lived stale timer (%s) started for %d sec", |
813 | peer, | |
1479ed2f DA |
814 | get_afi_safi_str(afi, safi, false), |
815 | peer->llgr[afi][safi].stale_time); | |
816 | ||
817 | SET_FLAG(peer->af_sflags[afi][safi], | |
818 | PEER_STATUS_LLGR_WAIT); | |
819 | ||
820 | bgp_set_llgr_stale(peer, afi, safi); | |
821 | bgp_clear_stale_route(peer, afi, safi); | |
822 | ||
823 | thread_add_timer(bm->master, | |
824 | bgp_llgr_stale_timer_expire, paf, | |
825 | peer->llgr[afi][safi].stale_time, | |
826 | &peer->t_llgr_stale[afi][safi]); | |
827 | ||
828 | for (ALL_LIST_ELEMENTS(peer->bgp->peer, node, nnode, | |
829 | tmp_peer)) | |
830 | bgp_announce_route(tmp_peer, afi, safi, false); | |
831 | } else { | |
832 | bgp_clear_stale_route(peer, afi, safi); | |
833 | } | |
834 | } | |
835 | ||
836 | bgp_graceful_restart_timer_off(peer); | |
93406d87 | 837 | } |
838 | ||
cc9f21da | 839 | static void bgp_graceful_stale_timer_expire(struct thread *thread) |
93406d87 | 840 | { |
d62a17ae | 841 | struct peer *peer; |
842 | afi_t afi; | |
843 | safi_t safi; | |
93406d87 | 844 | |
d62a17ae | 845 | peer = THREAD_ARG(thread); |
93406d87 | 846 | |
d62a17ae | 847 | if (bgp_debug_neighbor_events(peer)) |
f70c91dc DA |
848 | zlog_debug("%pBP graceful restart stalepath timer expired", |
849 | peer); | |
93406d87 | 850 | |
d62a17ae | 851 | /* NSF delete stale route */ |
df8d723c DA |
852 | FOREACH_AFI_SAFI_NSF (afi, safi) |
853 | if (peer->nsf[afi][safi]) | |
854 | bgp_clear_stale_route(peer, afi, safi); | |
93406d87 | 855 | } |
856 | ||
f009ff26 | 857 | /* Selection deferral timer processing function */ |
cc9f21da | 858 | static void bgp_graceful_deferral_timer_expire(struct thread *thread) |
f009ff26 | 859 | { |
860 | struct afi_safi_info *info; | |
861 | afi_t afi; | |
862 | safi_t safi; | |
863 | struct bgp *bgp; | |
864 | ||
865 | info = THREAD_ARG(thread); | |
866 | afi = info->afi; | |
867 | safi = info->safi; | |
868 | bgp = info->bgp; | |
869 | ||
870 | if (BGP_DEBUG(update, UPDATE_OUT)) | |
13909c4f DS |
871 | zlog_debug( |
872 | "afi %d, safi %d : graceful restart deferral timer expired", | |
873 | afi, safi); | |
f009ff26 | 874 | |
f009ff26 | 875 | bgp->gr_info[afi][safi].eor_required = 0; |
876 | bgp->gr_info[afi][safi].eor_received = 0; | |
877 | XFREE(MTYPE_TMP, info); | |
878 | ||
879 | /* Best path selection */ | |
cc9f21da | 880 | bgp_best_path_select_defer(bgp, afi, safi); |
f009ff26 | 881 | } |
882 | ||
3dc339cd | 883 | static bool bgp_update_delay_applicable(struct bgp *bgp) |
f188f2c4 | 884 | { |
d62a17ae | 885 | /* update_delay_over flag should be reset (set to 0) for any new |
886 | applicability of the update-delay during BGP process lifetime. | |
887 | And it should be set after an occurence of the update-delay is | |
888 | over)*/ | |
889 | if (!bgp->update_delay_over) | |
3dc339cd DA |
890 | return true; |
891 | return false; | |
f188f2c4 DS |
892 | } |
893 | ||
3dc339cd | 894 | bool bgp_update_delay_active(struct bgp *bgp) |
f188f2c4 | 895 | { |
d62a17ae | 896 | if (bgp->t_update_delay) |
3dc339cd DA |
897 | return true; |
898 | return false; | |
f188f2c4 DS |
899 | } |
900 | ||
3dc339cd | 901 | bool bgp_update_delay_configured(struct bgp *bgp) |
f188f2c4 | 902 | { |
d62a17ae | 903 | if (bgp->v_update_delay) |
3dc339cd DA |
904 | return true; |
905 | return false; | |
f188f2c4 DS |
906 | } |
907 | ||
908 | /* Do the post-processing needed when bgp comes out of the read-only mode | |
909 | on ending the update delay. */ | |
d62a17ae | 910 | void bgp_update_delay_end(struct bgp *bgp) |
f188f2c4 | 911 | { |
50478845 MS |
912 | THREAD_OFF(bgp->t_update_delay); |
913 | THREAD_OFF(bgp->t_establish_wait); | |
d62a17ae | 914 | |
915 | /* Reset update-delay related state */ | |
916 | bgp->update_delay_over = 1; | |
917 | bgp->established = 0; | |
918 | bgp->restarted_peers = 0; | |
919 | bgp->implicit_eors = 0; | |
920 | bgp->explicit_eors = 0; | |
921 | ||
e36f61b5 DS |
922 | frr_timestamp(3, bgp->update_delay_end_time, |
923 | sizeof(bgp->update_delay_end_time)); | |
d62a17ae | 924 | |
925 | /* | |
926 | * Add an end-of-initial-update marker to the main process queues so | |
927 | * that | |
928 | * the route advertisement timer for the peers can be started. Also set | |
929 | * the zebra and peer update hold flags. These flags are used to achieve | |
930 | * three stages in the update-delay post processing: | |
931 | * 1. Finish best-path selection for all the prefixes held on the | |
932 | * queues. | |
933 | * (routes in BGP are updated, and peers sync queues are populated | |
934 | * too) | |
935 | * 2. As the eoiu mark is reached in the bgp process routine, ship all | |
936 | * the | |
937 | * routes to zebra. With that zebra should see updates from BGP | |
938 | * close | |
939 | * to each other. | |
940 | * 3. Unblock the peer update writes. With that peer update packing | |
941 | * with | |
942 | * the prefixes should be at its maximum. | |
943 | */ | |
944 | bgp_add_eoiu_mark(bgp); | |
945 | bgp->main_zebra_update_hold = 1; | |
946 | bgp->main_peers_update_hold = 1; | |
947 | ||
b6c386bb DS |
948 | /* |
949 | * Resume the queue processing. This should trigger the event that would | |
950 | * take care of processing any work that was queued during the read-only | |
951 | * mode. | |
952 | */ | |
953 | work_queue_unplug(bgp->process_queue); | |
f188f2c4 DS |
954 | } |
955 | ||
cb1faec9 DS |
956 | /** |
957 | * see bgp_fsm.h | |
958 | */ | |
d62a17ae | 959 | void bgp_start_routeadv(struct bgp *bgp) |
cb1faec9 | 960 | { |
d62a17ae | 961 | struct listnode *node, *nnode; |
962 | struct peer *peer; | |
cb1faec9 | 963 | |
a10c2872 | 964 | zlog_info("%s, update hold status %d", __func__, |
d62a17ae | 965 | bgp->main_peers_update_hold); |
4a16ae86 | 966 | |
d62a17ae | 967 | if (bgp->main_peers_update_hold) |
968 | return; | |
4a16ae86 | 969 | |
e36f61b5 DS |
970 | frr_timestamp(3, bgp->update_delay_peers_resume_time, |
971 | sizeof(bgp->update_delay_peers_resume_time)); | |
4a16ae86 | 972 | |
d62a17ae | 973 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) { |
feb17238 | 974 | if (!peer_established(peer)) |
d62a17ae | 975 | continue; |
fa5806c3 | 976 | THREAD_OFF(peer->t_routeadv); |
d62a17ae | 977 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); |
978 | } | |
cb1faec9 DS |
979 | } |
980 | ||
981 | /** | |
982 | * see bgp_fsm.h | |
983 | */ | |
d62a17ae | 984 | void bgp_adjust_routeadv(struct peer *peer) |
cb1faec9 | 985 | { |
083ec940 | 986 | time_t nowtime = monotime(NULL); |
d62a17ae | 987 | double diff; |
988 | unsigned long remain; | |
989 | ||
990 | /* Bypass checks for special case of MRAI being 0 */ | |
991 | if (peer->v_routeadv == 0) { | |
992 | /* Stop existing timer, just in case it is running for a | |
993 | * different | |
994 | * duration and schedule write thread immediately. | |
995 | */ | |
fa5806c3 | 996 | THREAD_OFF(peer->t_routeadv); |
d62a17ae | 997 | |
083ec940 | 998 | peer->synctime = monotime(NULL); |
a77e2f4b S |
999 | /* If suppress fib pending is enabled, route is advertised to |
1000 | * peers when the status is received from the FIB. The delay | |
1001 | * is added to update group packet generate which will allow | |
1002 | * more routes to be sent in the update message | |
1003 | */ | |
1004 | BGP_UPDATE_GROUP_TIMER_ON(&peer->t_generate_updgrp_packets, | |
1005 | bgp_generate_updgrp_packets); | |
d62a17ae | 1006 | return; |
1007 | } | |
1008 | ||
1009 | ||
1010 | /* | |
1011 | * CASE I: | |
1012 | * If the last update was written more than MRAI back, expire the timer | |
1013 | * instantly so that we can send the update out sooner. | |
1014 | * | |
1015 | * <------- MRAI ---------> | |
1016 | * |-----------------|-----------------------| | |
1017 | * <------------- m ------------> | |
1018 | * ^ ^ ^ | |
1019 | * | | | | |
1020 | * | | current time | |
1021 | * | timer start | |
1022 | * last write | |
1023 | * | |
1024 | * m > MRAI | |
1025 | */ | |
1026 | diff = difftime(nowtime, peer->last_update); | |
1027 | if (diff > (double)peer->v_routeadv) { | |
fa5806c3 | 1028 | THREAD_OFF(peer->t_routeadv); |
d62a17ae | 1029 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); |
1030 | return; | |
1031 | } | |
1032 | ||
1033 | /* | |
1034 | * CASE II: | |
1035 | * - Find when to expire the MRAI timer. | |
1036 | * If MRAI timer is not active, assume we can start it now. | |
1037 | * | |
1038 | * <------- MRAI ---------> | |
1039 | * |------------|-----------------------| | |
1040 | * <-------- m ----------><----- r -----> | |
1041 | * ^ ^ ^ | |
1042 | * | | | | |
1043 | * | | current time | |
1044 | * | timer start | |
1045 | * last write | |
1046 | * | |
1047 | * (MRAI - m) < r | |
1048 | */ | |
1049 | if (peer->t_routeadv) | |
1050 | remain = thread_timer_remain_second(peer->t_routeadv); | |
1051 | else | |
1052 | remain = peer->v_routeadv; | |
1053 | diff = peer->v_routeadv - diff; | |
1054 | if (diff <= (double)remain) { | |
fa5806c3 | 1055 | THREAD_OFF(peer->t_routeadv); |
d62a17ae | 1056 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, diff); |
1057 | } | |
cb1faec9 DS |
1058 | } |
1059 | ||
3dc339cd | 1060 | static bool bgp_maxmed_onstartup_applicable(struct bgp *bgp) |
abc920f8 | 1061 | { |
d62a17ae | 1062 | if (!bgp->maxmed_onstartup_over) |
3dc339cd DA |
1063 | return true; |
1064 | return false; | |
abc920f8 DS |
1065 | } |
1066 | ||
3dc339cd | 1067 | bool bgp_maxmed_onstartup_configured(struct bgp *bgp) |
abc920f8 | 1068 | { |
d62a17ae | 1069 | if (bgp->v_maxmed_onstartup != BGP_MAXMED_ONSTARTUP_UNCONFIGURED) |
3dc339cd DA |
1070 | return true; |
1071 | return false; | |
abc920f8 DS |
1072 | } |
1073 | ||
3dc339cd | 1074 | bool bgp_maxmed_onstartup_active(struct bgp *bgp) |
abc920f8 | 1075 | { |
d62a17ae | 1076 | if (bgp->t_maxmed_onstartup) |
3dc339cd DA |
1077 | return true; |
1078 | return false; | |
abc920f8 DS |
1079 | } |
1080 | ||
d62a17ae | 1081 | void bgp_maxmed_update(struct bgp *bgp) |
abc920f8 | 1082 | { |
d7c0a89a QY |
1083 | uint8_t maxmed_active; |
1084 | uint32_t maxmed_value; | |
d62a17ae | 1085 | |
1086 | if (bgp->v_maxmed_admin) { | |
1087 | maxmed_active = 1; | |
1088 | maxmed_value = bgp->maxmed_admin_value; | |
1089 | } else if (bgp->t_maxmed_onstartup) { | |
1090 | maxmed_active = 1; | |
1091 | maxmed_value = bgp->maxmed_onstartup_value; | |
1092 | } else { | |
1093 | maxmed_active = 0; | |
1094 | maxmed_value = BGP_MAXMED_VALUE_DEFAULT; | |
1095 | } | |
1096 | ||
1097 | if (bgp->maxmed_active != maxmed_active | |
1098 | || bgp->maxmed_value != maxmed_value) { | |
1099 | bgp->maxmed_active = maxmed_active; | |
1100 | bgp->maxmed_value = maxmed_value; | |
1101 | ||
1102 | update_group_announce(bgp); | |
1103 | } | |
abc920f8 DS |
1104 | } |
1105 | ||
3893aeee DA |
1106 | int bgp_fsm_error_subcode(int status) |
1107 | { | |
1108 | int fsm_err_subcode = BGP_NOTIFY_FSM_ERR_SUBCODE_UNSPECIFIC; | |
1109 | ||
1110 | switch (status) { | |
1111 | case OpenSent: | |
1112 | fsm_err_subcode = BGP_NOTIFY_FSM_ERR_SUBCODE_OPENSENT; | |
1113 | break; | |
1114 | case OpenConfirm: | |
1115 | fsm_err_subcode = BGP_NOTIFY_FSM_ERR_SUBCODE_OPENCONFIRM; | |
1116 | break; | |
1117 | case Established: | |
1118 | fsm_err_subcode = BGP_NOTIFY_FSM_ERR_SUBCODE_ESTABLISHED; | |
1119 | break; | |
1120 | default: | |
1121 | break; | |
1122 | } | |
1123 | ||
1124 | return fsm_err_subcode; | |
1125 | } | |
1126 | ||
abc920f8 | 1127 | /* The maxmed onstartup timer expiry callback. */ |
cc9f21da | 1128 | static void bgp_maxmed_onstartup_timer(struct thread *thread) |
abc920f8 | 1129 | { |
d62a17ae | 1130 | struct bgp *bgp; |
abc920f8 | 1131 | |
d62a17ae | 1132 | zlog_info("Max med on startup ended - timer expired."); |
abc920f8 | 1133 | |
d62a17ae | 1134 | bgp = THREAD_ARG(thread); |
50478845 | 1135 | THREAD_OFF(bgp->t_maxmed_onstartup); |
d62a17ae | 1136 | bgp->maxmed_onstartup_over = 1; |
abc920f8 | 1137 | |
d62a17ae | 1138 | bgp_maxmed_update(bgp); |
abc920f8 DS |
1139 | } |
1140 | ||
d62a17ae | 1141 | static void bgp_maxmed_onstartup_begin(struct bgp *bgp) |
abc920f8 | 1142 | { |
d62a17ae | 1143 | /* Applicable only once in the process lifetime on the startup */ |
1144 | if (bgp->maxmed_onstartup_over) | |
1145 | return; | |
abc920f8 | 1146 | |
d62a17ae | 1147 | zlog_info("Begin maxmed onstartup mode - timer %d seconds", |
1148 | bgp->v_maxmed_onstartup); | |
abc920f8 | 1149 | |
d62a17ae | 1150 | thread_add_timer(bm->master, bgp_maxmed_onstartup_timer, bgp, |
1151 | bgp->v_maxmed_onstartup, &bgp->t_maxmed_onstartup); | |
abc920f8 | 1152 | |
d62a17ae | 1153 | if (!bgp->v_maxmed_admin) { |
1154 | bgp->maxmed_active = 1; | |
1155 | bgp->maxmed_value = bgp->maxmed_onstartup_value; | |
1156 | } | |
abc920f8 | 1157 | |
d62a17ae | 1158 | /* Route announce to all peers should happen after this in |
1159 | * bgp_establish() */ | |
abc920f8 DS |
1160 | } |
1161 | ||
d62a17ae | 1162 | static void bgp_maxmed_onstartup_process_status_change(struct peer *peer) |
abc920f8 | 1163 | { |
feb17238 | 1164 | if (peer_established(peer) && !peer->bgp->established) { |
d62a17ae | 1165 | bgp_maxmed_onstartup_begin(peer->bgp); |
1166 | } | |
abc920f8 DS |
1167 | } |
1168 | ||
f188f2c4 | 1169 | /* The update delay timer expiry callback. */ |
cc9f21da | 1170 | static void bgp_update_delay_timer(struct thread *thread) |
f188f2c4 | 1171 | { |
d62a17ae | 1172 | struct bgp *bgp; |
f188f2c4 | 1173 | |
d62a17ae | 1174 | zlog_info("Update delay ended - timer expired."); |
f188f2c4 | 1175 | |
d62a17ae | 1176 | bgp = THREAD_ARG(thread); |
50478845 | 1177 | THREAD_OFF(bgp->t_update_delay); |
d62a17ae | 1178 | bgp_update_delay_end(bgp); |
f188f2c4 DS |
1179 | } |
1180 | ||
1181 | /* The establish wait timer expiry callback. */ | |
cc9f21da | 1182 | static void bgp_establish_wait_timer(struct thread *thread) |
f188f2c4 | 1183 | { |
d62a17ae | 1184 | struct bgp *bgp; |
f188f2c4 | 1185 | |
d62a17ae | 1186 | zlog_info("Establish wait - timer expired."); |
f188f2c4 | 1187 | |
d62a17ae | 1188 | bgp = THREAD_ARG(thread); |
50478845 | 1189 | THREAD_OFF(bgp->t_establish_wait); |
d62a17ae | 1190 | bgp_check_update_delay(bgp); |
f188f2c4 DS |
1191 | } |
1192 | ||
1193 | /* Steps to begin the update delay: | |
1194 | - initialize queues if needed | |
1195 | - stop the queue processing | |
1196 | - start the timer */ | |
d62a17ae | 1197 | static void bgp_update_delay_begin(struct bgp *bgp) |
f188f2c4 | 1198 | { |
d62a17ae | 1199 | struct listnode *node, *nnode; |
1200 | struct peer *peer; | |
f188f2c4 | 1201 | |
d62a17ae | 1202 | /* Stop the processing of queued work. Enqueue shall continue */ |
b6c386bb | 1203 | work_queue_plug(bgp->process_queue); |
f188f2c4 | 1204 | |
d62a17ae | 1205 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) |
1206 | peer->update_delay_over = 0; | |
f188f2c4 | 1207 | |
d62a17ae | 1208 | /* Start the update-delay timer */ |
1209 | thread_add_timer(bm->master, bgp_update_delay_timer, bgp, | |
1210 | bgp->v_update_delay, &bgp->t_update_delay); | |
f188f2c4 | 1211 | |
d62a17ae | 1212 | if (bgp->v_establish_wait != bgp->v_update_delay) |
1213 | thread_add_timer(bm->master, bgp_establish_wait_timer, bgp, | |
1214 | bgp->v_establish_wait, &bgp->t_establish_wait); | |
f188f2c4 | 1215 | |
e36f61b5 DS |
1216 | frr_timestamp(3, bgp->update_delay_begin_time, |
1217 | sizeof(bgp->update_delay_begin_time)); | |
f188f2c4 DS |
1218 | } |
1219 | ||
d62a17ae | 1220 | static void bgp_update_delay_process_status_change(struct peer *peer) |
f188f2c4 | 1221 | { |
feb17238 | 1222 | if (peer_established(peer)) { |
d62a17ae | 1223 | if (!peer->bgp->established++) { |
1224 | bgp_update_delay_begin(peer->bgp); | |
1225 | zlog_info( | |
1226 | "Begin read-only mode - update-delay timer %d seconds", | |
1227 | peer->bgp->v_update_delay); | |
1228 | } | |
54394daa | 1229 | if (CHECK_FLAG(peer->cap, PEER_CAP_GRACEFUL_RESTART_R_BIT_RCV)) |
d62a17ae | 1230 | bgp_update_restarted_peers(peer); |
1231 | } | |
1232 | if (peer->ostatus == Established | |
1233 | && bgp_update_delay_active(peer->bgp)) { | |
1234 | /* Adjust the update-delay state to account for this flap. | |
1235 | NOTE: Intentionally skipping adjusting implicit_eors or | |
1236 | explicit_eors | |
1237 | counters. Extra sanity check in bgp_check_update_delay() | |
1238 | should | |
1239 | be enough to take care of any additive discrepancy in bgp eor | |
1240 | counters */ | |
1241 | peer->bgp->established--; | |
1242 | peer->update_delay_over = 0; | |
1243 | } | |
f188f2c4 DS |
1244 | } |
1245 | ||
0437e105 | 1246 | /* Called after event occurred, this function change status and reset |
200df115 | 1247 | read/write and timer thread. */ |
881979e4 | 1248 | void bgp_fsm_change_status(struct peer *peer, enum bgp_fsm_status status) |
200df115 | 1249 | { |
36dc7588 | 1250 | struct bgp *bgp; |
1251 | uint32_t peer_count; | |
1ff9a340 | 1252 | |
36dc7588 | 1253 | bgp = peer->bgp; |
1254 | peer_count = bgp->established_peers; | |
1255 | ||
1256 | if (status == Established) | |
1257 | bgp->established_peers++; | |
feb17238 | 1258 | else if ((peer_established(peer)) && (status != Established)) |
36dc7588 | 1259 | bgp->established_peers--; |
1260 | ||
1cfe005d DS |
1261 | if (bgp_debug_neighbor_events(peer)) { |
1262 | struct vrf *vrf = vrf_lookup_by_id(bgp->vrf_id); | |
1263 | ||
1264 | zlog_debug("%s : vrf %s(%u), Status: %s established_peers %u", __func__, | |
1265 | vrf ? vrf->name : "Unknown", bgp->vrf_id, | |
1266 | lookup_msg(bgp_status_msg, status, NULL), | |
1267 | bgp->established_peers); | |
1268 | } | |
1269 | ||
36dc7588 | 1270 | /* Set to router ID to the value provided by RIB if there are no peers |
1271 | * in the established state and peer count did not change | |
1272 | */ | |
1273 | if ((peer_count != bgp->established_peers) && | |
1274 | (bgp->established_peers == 0)) | |
1275 | bgp_router_id_zebra_bump(bgp->vrf_id, NULL); | |
1276 | ||
d62a17ae | 1277 | /* Transition into Clearing or Deleted must /always/ clear all routes.. |
1278 | * (and must do so before actually changing into Deleted.. | |
1279 | */ | |
1280 | if (status >= Clearing) { | |
1281 | bgp_clear_route_all(peer); | |
1282 | ||
1283 | /* If no route was queued for the clear-node processing, | |
1284 | * generate the | |
1285 | * completion event here. This is needed because if there are no | |
1286 | * routes | |
1287 | * to trigger the background clear-node thread, the event won't | |
1288 | * get | |
1289 | * generated and the peer would be stuck in Clearing. Note that | |
1290 | * this | |
1291 | * event is for the peer and helps the peer transition out of | |
1292 | * Clearing | |
1293 | * state; it should not be generated per (AFI,SAFI). The event | |
1294 | * is | |
1295 | * directly posted here without calling clear_node_complete() as | |
1296 | * we | |
1297 | * shouldn't do an extra unlock. This event will get processed | |
1298 | * after | |
1299 | * the state change that happens below, so peer will be in | |
1300 | * Clearing | |
1301 | * (or Deleted). | |
1302 | */ | |
69ef3f31 DS |
1303 | if (!work_queue_is_scheduled(peer->clear_node_queue) && |
1304 | status != Deleted) | |
d62a17ae | 1305 | BGP_EVENT_ADD(peer, Clearing_Completed); |
1306 | } | |
1307 | ||
1308 | /* Preserve old status and change into new status. */ | |
1309 | peer->ostatus = peer->status; | |
1310 | peer->status = status; | |
1311 | ||
8336c896 DA |
1312 | /* Reset received keepalives counter on every FSM change */ |
1313 | peer->rtt_keepalive_rcv = 0; | |
1314 | ||
05e68acc | 1315 | /* Fire backward transition hook if that's the case */ |
adf552ab | 1316 | if (peer->ostatus == Established && peer->status != Established) |
05e68acc BC |
1317 | hook_call(peer_backward_transition, peer); |
1318 | ||
d62a17ae | 1319 | /* Save event that caused status change. */ |
1320 | peer->last_major_event = peer->cur_event; | |
1321 | ||
7d8d0eab MKS |
1322 | /* Operations after status change */ |
1323 | hook_call(peer_status_changed, peer); | |
1324 | ||
d62a17ae | 1325 | if (status == Established) |
1326 | UNSET_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER); | |
1327 | ||
1328 | /* If max-med processing is applicable, do the necessary. */ | |
1329 | if (status == Established) { | |
1330 | if (bgp_maxmed_onstartup_configured(peer->bgp) | |
1331 | && bgp_maxmed_onstartup_applicable(peer->bgp)) | |
1332 | bgp_maxmed_onstartup_process_status_change(peer); | |
1333 | else | |
1334 | peer->bgp->maxmed_onstartup_over = 1; | |
1335 | } | |
1336 | ||
1337 | /* If update-delay processing is applicable, do the necessary. */ | |
1338 | if (bgp_update_delay_configured(peer->bgp) | |
1339 | && bgp_update_delay_applicable(peer->bgp)) | |
1340 | bgp_update_delay_process_status_change(peer); | |
1341 | ||
1342 | if (bgp_debug_neighbor_events(peer)) | |
71d276c8 | 1343 | zlog_debug("%s fd %d went from %s to %s", peer->host, peer->fd, |
d62a17ae | 1344 | lookup_msg(bgp_status_msg, peer->ostatus, NULL), |
1345 | lookup_msg(bgp_status_msg, peer->status, NULL)); | |
200df115 | 1346 | } |
1347 | ||
3117b5c4 | 1348 | /* Flush the event queue and ensure the peer is shut down */ |
4da144f3 | 1349 | static enum bgp_fsm_state_progress bgp_clearing_completed(struct peer *peer) |
3117b5c4 | 1350 | { |
4da144f3 | 1351 | enum bgp_fsm_state_progress rc = bgp_stop(peer); |
1ff9a340 | 1352 | |
4da144f3 | 1353 | if (rc >= BGP_FSM_SUCCESS) |
d62a17ae | 1354 | BGP_EVENT_FLUSH(peer); |
3117b5c4 | 1355 | |
d62a17ae | 1356 | return rc; |
3117b5c4 SH |
1357 | } |
1358 | ||
718e3744 | 1359 | /* Administrative BGP peer stop event. */ |
3117b5c4 | 1360 | /* May be called multiple times for the same peer */ |
4da144f3 | 1361 | enum bgp_fsm_state_progress bgp_stop(struct peer *peer) |
718e3744 | 1362 | { |
d62a17ae | 1363 | afi_t afi; |
1364 | safi_t safi; | |
1365 | char orf_name[BUFSIZ]; | |
4da144f3 | 1366 | enum bgp_fsm_state_progress ret = BGP_FSM_SUCCESS; |
f009ff26 | 1367 | struct bgp *bgp = peer->bgp; |
1368 | struct graceful_restart_info *gr_info = NULL; | |
d62a17ae | 1369 | |
2ba1fe69 | 1370 | peer->nsf_af_count = 0; |
1371 | ||
e7db872b | 1372 | /* deregister peer */ |
21bfce98 RZ |
1373 | if (peer->bfd_config |
1374 | && peer->last_reset == PEER_DOWN_UPDATE_SOURCE_CHANGE) | |
1375 | bfd_sess_uninstall(peer->bfd_config->session); | |
e7db872b | 1376 | |
af8496af DA |
1377 | if (peer_dynamic_neighbor_no_nsf(peer) && |
1378 | !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
d62a17ae | 1379 | if (bgp_debug_neighbor_events(peer)) |
31afff83 DA |
1380 | zlog_debug("%s (dynamic neighbor) deleted (%s)", |
1381 | peer->host, __func__); | |
d62a17ae | 1382 | peer_delete(peer); |
4da144f3 | 1383 | return BGP_FSM_FAILURE_AND_DELETE; |
c22767d8 | 1384 | } |
848973c7 | 1385 | |
d62a17ae | 1386 | /* Can't do this in Clearing; events are used for state transitions */ |
1387 | if (peer->status != Clearing) { | |
1388 | /* Delete all existing events of the peer */ | |
1389 | BGP_EVENT_FLUSH(peer); | |
93406d87 | 1390 | } |
d62a17ae | 1391 | |
1392 | /* Increment Dropped count. */ | |
feb17238 | 1393 | if (peer_established(peer)) { |
d62a17ae | 1394 | peer->dropped++; |
1395 | ||
07753623 DA |
1396 | /* Notify BGP conditional advertisement process */ |
1397 | peer->advmap_table_change = true; | |
1398 | ||
d62a17ae | 1399 | /* bgp log-neighbor-changes of neighbor Down */ |
892fedb6 DA |
1400 | if (CHECK_FLAG(peer->bgp->flags, |
1401 | BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { | |
d62a17ae | 1402 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); |
2986cac2 | 1403 | |
d62a17ae | 1404 | zlog_info( |
f70c91dc DA |
1405 | "%%ADJCHANGE: neighbor %pBP in vrf %s Down %s", |
1406 | peer, | |
5742e42b | 1407 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) |
a7d91a8c DA |
1408 | ? vrf->name |
1409 | : VRF_DEFAULT_NAME) | |
d62a17ae | 1410 | : "", |
1411 | peer_down_str[(int)peer->last_reset]); | |
1412 | } | |
1413 | ||
1414 | /* graceful restart */ | |
1415 | if (peer->t_gr_stale) { | |
fa5806c3 | 1416 | THREAD_OFF(peer->t_gr_stale); |
d62a17ae | 1417 | if (bgp_debug_neighbor_events(peer)) |
1418 | zlog_debug( | |
f70c91dc DA |
1419 | "%pBP graceful restart stalepath timer stopped", |
1420 | peer); | |
d62a17ae | 1421 | } |
1422 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
1423 | if (bgp_debug_neighbor_events(peer)) { | |
1424 | zlog_debug( | |
f70c91dc DA |
1425 | "%pBP graceful restart timer started for %d sec", |
1426 | peer, peer->v_gr_restart); | |
d62a17ae | 1427 | zlog_debug( |
f70c91dc DA |
1428 | "%pBP graceful restart stalepath timer started for %d sec", |
1429 | peer, peer->bgp->stalepath_time); | |
d62a17ae | 1430 | } |
1431 | BGP_TIMER_ON(peer->t_gr_restart, | |
1432 | bgp_graceful_restart_timer_expire, | |
1433 | peer->v_gr_restart); | |
1434 | BGP_TIMER_ON(peer->t_gr_stale, | |
1435 | bgp_graceful_stale_timer_expire, | |
1436 | peer->bgp->stalepath_time); | |
1437 | } else { | |
1438 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1439 | ||
df8d723c DA |
1440 | FOREACH_AFI_SAFI_NSF (afi, safi) |
1441 | peer->nsf[afi][safi] = 0; | |
d62a17ae | 1442 | } |
1443 | ||
9af52ccf DA |
1444 | /* Stop route-refresh stalepath timer */ |
1445 | if (peer->t_refresh_stalepath) { | |
fa5806c3 | 1446 | THREAD_OFF(peer->t_refresh_stalepath); |
9af52ccf DA |
1447 | |
1448 | if (bgp_debug_neighbor_events(peer)) | |
1449 | zlog_debug( | |
f70c91dc DA |
1450 | "%pBP route-refresh restart stalepath timer stopped", |
1451 | peer); | |
9af52ccf DA |
1452 | } |
1453 | ||
f009ff26 | 1454 | /* If peer reset before receiving EOR, decrement EOR count and |
1455 | * cancel the selection deferral timer if there are no | |
1456 | * pending EOR messages to be received | |
1457 | */ | |
1458 | if (BGP_PEER_GRACEFUL_RESTART_CAPABLE(peer)) { | |
1459 | FOREACH_AFI_SAFI (afi, safi) { | |
13909c4f DS |
1460 | if (!peer->afc_nego[afi][safi] |
1461 | || CHECK_FLAG(peer->af_sflags[afi][safi], | |
1462 | PEER_STATUS_EOR_RECEIVED)) | |
1463 | continue; | |
1464 | ||
1465 | gr_info = &bgp->gr_info[afi][safi]; | |
1466 | if (!gr_info) | |
1467 | continue; | |
1468 | ||
1469 | if (gr_info->eor_required) | |
1470 | gr_info->eor_required--; | |
1471 | ||
1472 | if (BGP_DEBUG(update, UPDATE_OUT)) | |
1473 | zlog_debug("peer %s, EOR_required %d", | |
1474 | peer->host, | |
1475 | gr_info->eor_required); | |
1476 | ||
1477 | /* There is no pending EOR message */ | |
1478 | if (gr_info->eor_required == 0) { | |
b96b4f1c SB |
1479 | if (gr_info->t_select_deferral) { |
1480 | void *info = THREAD_ARG( | |
1481 | gr_info->t_select_deferral); | |
1482 | XFREE(MTYPE_TMP, info); | |
1483 | } | |
fa5806c3 | 1484 | THREAD_OFF(gr_info->t_select_deferral); |
13909c4f | 1485 | gr_info->eor_received = 0; |
f009ff26 | 1486 | } |
1487 | } | |
1488 | } | |
1489 | ||
d62a17ae | 1490 | /* set last reset time */ |
083ec940 | 1491 | peer->resettime = peer->uptime = monotime(NULL); |
d62a17ae | 1492 | |
1493 | if (BGP_DEBUG(update_groups, UPDATE_GROUPS)) | |
1494 | zlog_debug("%s remove from all update group", | |
1495 | peer->host); | |
1496 | update_group_remove_peer_afs(peer); | |
1497 | ||
d62a17ae | 1498 | /* Reset peer synctime */ |
1499 | peer->synctime = 0; | |
93406d87 | 1500 | } |
93406d87 | 1501 | |
424ab01d | 1502 | /* stop keepalives */ |
b72b6f4f | 1503 | bgp_keepalives_off(peer); |
424ab01d QY |
1504 | |
1505 | /* Stop read and write threads. */ | |
1506 | bgp_writes_off(peer); | |
1507 | bgp_reads_off(peer); | |
1508 | ||
387f984e QY |
1509 | THREAD_OFF(peer->t_connect_check_r); |
1510 | THREAD_OFF(peer->t_connect_check_w); | |
d62a17ae | 1511 | |
1512 | /* Stop all timers. */ | |
fa5806c3 DS |
1513 | THREAD_OFF(peer->t_start); |
1514 | THREAD_OFF(peer->t_connect); | |
1515 | THREAD_OFF(peer->t_holdtime); | |
1516 | THREAD_OFF(peer->t_routeadv); | |
1517 | THREAD_OFF(peer->t_delayopen); | |
d62a17ae | 1518 | |
1519 | /* Clear input and output buffer. */ | |
cb1991af | 1520 | frr_with_mutex (&peer->io_mtx) { |
424ab01d QY |
1521 | if (peer->ibuf) |
1522 | stream_fifo_clean(peer->ibuf); | |
d3ecc69e QY |
1523 | if (peer->obuf) |
1524 | stream_fifo_clean(peer->obuf); | |
424ab01d QY |
1525 | |
1526 | if (peer->ibuf_work) | |
74ffbfe6 | 1527 | ringbuf_wipe(peer->ibuf_work); |
424ab01d QY |
1528 | if (peer->obuf_work) |
1529 | stream_reset(peer->obuf_work); | |
1530 | ||
1531 | if (peer->curr) { | |
1532 | stream_free(peer->curr); | |
1533 | peer->curr = NULL; | |
1534 | } | |
d3ecc69e | 1535 | } |
d62a17ae | 1536 | |
1537 | /* Close of file descriptor. */ | |
1538 | if (peer->fd >= 0) { | |
1539 | close(peer->fd); | |
1540 | peer->fd = -1; | |
93406d87 | 1541 | } |
1542 | ||
24f569e9 AS |
1543 | /* Reset capabilities. */ |
1544 | peer->cap = 0; | |
1545 | ||
d864dd9e | 1546 | /* Resetting neighbor role to the default value */ |
8f2d6021 | 1547 | peer->remote_role = ROLE_UNDEFINED; |
d864dd9e | 1548 | |
05c7a1cc QY |
1549 | FOREACH_AFI_SAFI (afi, safi) { |
1550 | /* Reset all negotiated variables */ | |
1551 | peer->afc_nego[afi][safi] = 0; | |
1552 | peer->afc_adv[afi][safi] = 0; | |
1553 | peer->afc_recv[afi][safi] = 0; | |
1554 | ||
1555 | /* peer address family capability flags*/ | |
1556 | peer->af_cap[afi][safi] = 0; | |
1557 | ||
1558 | /* peer address family status flags*/ | |
1559 | peer->af_sflags[afi][safi] = 0; | |
1560 | ||
1561 | /* Received ORF prefix-filter */ | |
1562 | peer->orf_plist[afi][safi] = NULL; | |
1563 | ||
feb17238 | 1564 | if ((peer->status == OpenConfirm) || (peer_established(peer))) { |
05c7a1cc | 1565 | /* ORF received prefix-filter pnt */ |
fc746f1c QY |
1566 | snprintf(orf_name, sizeof(orf_name), "%s.%d.%d", |
1567 | peer->host, afi, safi); | |
05c7a1cc | 1568 | prefix_bgp_orf_remove_all(afi, orf_name); |
d62a17ae | 1569 | } |
05c7a1cc | 1570 | } |
d62a17ae | 1571 | |
1572 | /* Reset keepalive and holdtime */ | |
b90a8e13 | 1573 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER)) { |
d62a17ae | 1574 | peer->v_keepalive = peer->keepalive; |
1575 | peer->v_holdtime = peer->holdtime; | |
1576 | } else { | |
1577 | peer->v_keepalive = peer->bgp->default_keepalive; | |
1578 | peer->v_holdtime = peer->bgp->default_holdtime; | |
1ff9a340 | 1579 | } |
d62a17ae | 1580 | |
6c537a18 DS |
1581 | /* Reset DelayOpenTime */ |
1582 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER_DELAYOPEN)) | |
1583 | peer->v_delayopen = peer->delayopen; | |
1584 | else | |
1585 | peer->v_delayopen = peer->bgp->default_delayopen; | |
1586 | ||
d62a17ae | 1587 | peer->update_time = 0; |
1588 | ||
d62a17ae | 1589 | if (!CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE) |
1590 | && !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
1591 | peer_delete(peer); | |
4da144f3 | 1592 | ret = BGP_FSM_FAILURE_AND_DELETE; |
d62a17ae | 1593 | } else { |
1594 | bgp_peer_conf_if_to_su_update(peer); | |
1595 | } | |
d62a17ae | 1596 | return ret; |
718e3744 | 1597 | } |
1598 | ||
1599 | /* BGP peer is stoped by the error. */ | |
4da144f3 | 1600 | static enum bgp_fsm_state_progress bgp_stop_with_error(struct peer *peer) |
718e3744 | 1601 | { |
d62a17ae | 1602 | /* Double start timer. */ |
1603 | peer->v_start *= 2; | |
1604 | ||
1605 | /* Overflow check. */ | |
1606 | if (peer->v_start >= (60 * 2)) | |
1607 | peer->v_start = (60 * 2); | |
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); |
4da144f3 | 1614 | return BGP_FSM_FAILURE; |
d62a17ae | 1615 | } |
1616 | ||
4da144f3 | 1617 | return bgp_stop(peer); |
718e3744 | 1618 | } |
1619 | ||
397b5bde LR |
1620 | |
1621 | /* something went wrong, send notify and tear down */ | |
4da144f3 DS |
1622 | static enum bgp_fsm_state_progress |
1623 | bgp_stop_with_notify(struct peer *peer, uint8_t code, uint8_t sub_code) | |
397b5bde | 1624 | { |
d62a17ae | 1625 | /* Send notify to remote peer */ |
1626 | bgp_notify_send(peer, code, sub_code); | |
1627 | ||
af8496af | 1628 | if (peer_dynamic_neighbor_no_nsf(peer)) { |
d62a17ae | 1629 | if (bgp_debug_neighbor_events(peer)) |
31afff83 DA |
1630 | zlog_debug("%s (dynamic neighbor) deleted (%s)", |
1631 | peer->host, __func__); | |
d62a17ae | 1632 | peer_delete(peer); |
4da144f3 | 1633 | return BGP_FSM_FAILURE; |
d62a17ae | 1634 | } |
f14e6fdb | 1635 | |
d62a17ae | 1636 | /* Clear start timer value to default. */ |
1637 | peer->v_start = BGP_INIT_START_TIMER; | |
397b5bde | 1638 | |
4da144f3 | 1639 | return bgp_stop(peer); |
397b5bde LR |
1640 | } |
1641 | ||
07a16526 QY |
1642 | /** |
1643 | * Determines whether a TCP session has successfully established for a peer and | |
1644 | * events as appropriate. | |
1645 | * | |
1646 | * This function is called when setting up a new session. After connect() is | |
387f984e QY |
1647 | * called on the peer's socket (in bgp_start()), the fd is passed to poll() |
1648 | * to wait for connection success or failure. When poll() returns, this | |
07a16526 | 1649 | * function is called to evaluate the result. |
387f984e QY |
1650 | * |
1651 | * Due to differences in behavior of poll() on Linux and BSD - specifically, | |
1652 | * the value of .revents in the case of a closed connection - this function is | |
1653 | * scheduled both for a read and a write event. The write event is triggered | |
1654 | * when the connection is established. A read event is triggered when the | |
1655 | * connection is closed. Thus we need to cancel whichever one did not occur. | |
07a16526 | 1656 | */ |
cc9f21da | 1657 | static void bgp_connect_check(struct thread *thread) |
07a16526 QY |
1658 | { |
1659 | int status; | |
1660 | socklen_t slen; | |
1661 | int ret; | |
1662 | struct peer *peer; | |
1663 | ||
1664 | peer = THREAD_ARG(thread); | |
424ab01d QY |
1665 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); |
1666 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); | |
1667 | assert(!peer->t_read); | |
1668 | assert(!peer->t_write); | |
07a16526 | 1669 | |
387f984e QY |
1670 | THREAD_OFF(peer->t_connect_check_r); |
1671 | THREAD_OFF(peer->t_connect_check_w); | |
dc1188bb | 1672 | |
07a16526 QY |
1673 | /* Check file descriptor. */ |
1674 | slen = sizeof(status); | |
1675 | ret = getsockopt(peer->fd, SOL_SOCKET, SO_ERROR, (void *)&status, | |
1676 | &slen); | |
1677 | ||
1678 | /* If getsockopt is fail, this is fatal error. */ | |
1679 | if (ret < 0) { | |
4cb5e18b | 1680 | zlog_err("can't get sockopt for nonblocking connect: %d(%s)", |
54ff5e9b | 1681 | errno, safe_strerror(errno)); |
07a16526 | 1682 | BGP_EVENT_ADD(peer, TCP_fatal_error); |
cc9f21da | 1683 | return; |
07a16526 QY |
1684 | } |
1685 | ||
1686 | /* When status is 0 then TCP connection is established. */ | |
1687 | if (status == 0) { | |
6c537a18 DS |
1688 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER_DELAYOPEN)) |
1689 | BGP_EVENT_ADD(peer, TCP_connection_open_w_delay); | |
1690 | else | |
1691 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
cc9f21da | 1692 | return; |
07a16526 QY |
1693 | } else { |
1694 | if (bgp_debug_neighbor_events(peer)) | |
54ff5e9b DS |
1695 | zlog_debug("%s [Event] Connect failed %d(%s)", |
1696 | peer->host, status, safe_strerror(status)); | |
07a16526 | 1697 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); |
cc9f21da | 1698 | return; |
07a16526 QY |
1699 | } |
1700 | } | |
397b5bde | 1701 | |
718e3744 | 1702 | /* TCP connection open. Next we send open message to remote peer. And |
1703 | add read thread for reading open message. */ | |
4da144f3 | 1704 | static enum bgp_fsm_state_progress bgp_connect_success(struct peer *peer) |
718e3744 | 1705 | { |
d62a17ae | 1706 | if (peer->fd < 0) { |
a10c2872 | 1707 | flog_err(EC_BGP_CONNECT, "%s peer's fd is negative value %d", |
1708 | __func__, peer->fd); | |
4da144f3 | 1709 | return bgp_stop(peer); |
d62a17ae | 1710 | } |
1711 | ||
1712 | if (bgp_getsockname(peer) < 0) { | |
450971aa | 1713 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 | 1714 | "%s: bgp_getsockname(): failed for peer %s, fd %d", |
15569c58 | 1715 | __func__, peer->host, peer->fd); |
3893aeee DA |
1716 | bgp_notify_send(peer, BGP_NOTIFY_FSM_ERR, |
1717 | bgp_fsm_error_subcode(peer->status)); | |
424ab01d | 1718 | bgp_writes_on(peer); |
4da144f3 | 1719 | return BGP_FSM_FAILURE; |
d62a17ae | 1720 | } |
1721 | ||
cea8b655 DS |
1722 | /* |
1723 | * If we are doing nht for a peer that ls v6 LL based | |
1724 | * massage the event system to make things happy | |
1725 | */ | |
1726 | bgp_nht_interface_events(peer); | |
1727 | ||
424ab01d | 1728 | bgp_reads_on(peer); |
d62a17ae | 1729 | |
1730 | if (bgp_debug_neighbor_events(peer)) { | |
d62a17ae | 1731 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
c0d72166 DS |
1732 | zlog_debug("%s open active, local address %pSU", |
1733 | peer->host, peer->su_local); | |
d62a17ae | 1734 | else |
1735 | zlog_debug("%s passive open", peer->host); | |
1736 | } | |
1737 | ||
6c537a18 | 1738 | /* Send an open message */ |
d62a17ae | 1739 | bgp_open_send(peer); |
1740 | ||
4da144f3 | 1741 | return BGP_FSM_SUCCESS; |
718e3744 | 1742 | } |
1743 | ||
6c537a18 DS |
1744 | /* TCP connection open with RFC 4271 optional session attribute DelayOpen flag |
1745 | * set. | |
1746 | */ | |
4da144f3 DS |
1747 | static enum bgp_fsm_state_progress |
1748 | bgp_connect_success_w_delayopen(struct peer *peer) | |
6c537a18 DS |
1749 | { |
1750 | if (peer->fd < 0) { | |
1751 | flog_err(EC_BGP_CONNECT, "%s: peer's fd is negative value %d", | |
1752 | __func__, peer->fd); | |
4da144f3 | 1753 | return bgp_stop(peer); |
6c537a18 DS |
1754 | } |
1755 | ||
1756 | if (bgp_getsockname(peer) < 0) { | |
1757 | flog_err_sys(EC_LIB_SOCKET, | |
1758 | "%s: bgp_getsockname(): failed for peer %s, fd %d", | |
1759 | __func__, peer->host, peer->fd); | |
1760 | bgp_notify_send(peer, BGP_NOTIFY_FSM_ERR, | |
1761 | bgp_fsm_error_subcode(peer->status)); | |
1762 | bgp_writes_on(peer); | |
4da144f3 | 1763 | return BGP_FSM_FAILURE; |
6c537a18 DS |
1764 | } |
1765 | ||
cea8b655 DS |
1766 | /* |
1767 | * If we are doing nht for a peer that ls v6 LL based | |
1768 | * massage the event system to make things happy | |
1769 | */ | |
1770 | bgp_nht_interface_events(peer); | |
1771 | ||
6c537a18 DS |
1772 | bgp_reads_on(peer); |
1773 | ||
1774 | if (bgp_debug_neighbor_events(peer)) { | |
6c537a18 | 1775 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
c0d72166 DS |
1776 | zlog_debug("%s open active, local address %pSU", |
1777 | peer->host, peer->su_local); | |
6c537a18 DS |
1778 | else |
1779 | zlog_debug("%s passive open", peer->host); | |
1780 | } | |
1781 | ||
1782 | /* set the DelayOpenTime to the inital value */ | |
1783 | peer->v_delayopen = peer->delayopen; | |
1784 | ||
1785 | /* Start the DelayOpenTimer if it is not already running */ | |
1786 | if (!peer->t_delayopen) | |
1787 | BGP_TIMER_ON(peer->t_delayopen, bgp_delayopen_timer, | |
1788 | peer->v_delayopen); | |
1789 | ||
1790 | if (bgp_debug_neighbor_events(peer)) | |
1791 | zlog_debug("%s [FSM] BGP OPEN message delayed for %d seconds", | |
1792 | peer->host, peer->delayopen); | |
1793 | ||
4da144f3 | 1794 | return BGP_FSM_SUCCESS; |
6c537a18 DS |
1795 | } |
1796 | ||
718e3744 | 1797 | /* TCP connect fail */ |
4da144f3 | 1798 | static enum bgp_fsm_state_progress bgp_connect_fail(struct peer *peer) |
718e3744 | 1799 | { |
af8496af | 1800 | if (peer_dynamic_neighbor_no_nsf(peer)) { |
d62a17ae | 1801 | if (bgp_debug_neighbor_events(peer)) |
31afff83 DA |
1802 | zlog_debug("%s (dynamic neighbor) deleted (%s)", |
1803 | peer->host, __func__); | |
d62a17ae | 1804 | peer_delete(peer); |
4da144f3 | 1805 | return BGP_FSM_FAILURE_AND_DELETE; |
d62a17ae | 1806 | } |
1807 | ||
8761cd6d DS |
1808 | /* |
1809 | * If we are doing nht for a peer that ls v6 LL based | |
1810 | * massage the event system to make things happy | |
1811 | */ | |
1812 | bgp_nht_interface_events(peer); | |
1813 | ||
4da144f3 | 1814 | return bgp_stop(peer); |
718e3744 | 1815 | } |
1816 | ||
1817 | /* This function is the first starting point of all BGP connection. It | |
6c537a18 DS |
1818 | * try to connect to remote peer with non-blocking IO. |
1819 | */ | |
4da144f3 | 1820 | enum bgp_fsm_state_progress bgp_start(struct peer *peer) |
718e3744 | 1821 | { |
d62a17ae | 1822 | int status; |
d62a17ae | 1823 | |
1824 | bgp_peer_conf_if_to_su_update(peer); | |
1825 | ||
1826 | if (peer->su.sa.sa_family == AF_UNSPEC) { | |
1827 | if (bgp_debug_neighbor_events(peer)) | |
1828 | zlog_debug( | |
1829 | "%s [FSM] Unable to get neighbor's IP address, waiting...", | |
1830 | peer->host); | |
3577f1c5 | 1831 | peer->last_reset = PEER_DOWN_NBR_ADDR; |
4da144f3 | 1832 | return BGP_FSM_FAILURE; |
d62a17ae | 1833 | } |
1834 | ||
1835 | if (BGP_PEER_START_SUPPRESSED(peer)) { | |
1836 | if (bgp_debug_neighbor_events(peer)) | |
e50f7cfd | 1837 | flog_err(EC_BGP_FSM, |
3efd0893 | 1838 | "%s [FSM] Trying to start suppressed peer - this is never supposed to happen!", |
1c50c1c0 | 1839 | peer->host); |
5597214c DA |
1840 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_RTT_SHUTDOWN)) |
1841 | peer->last_reset = PEER_DOWN_RTT_SHUTDOWN; | |
1842 | else if (CHECK_FLAG(peer->flags, PEER_FLAG_SHUTDOWN)) | |
07d1e5d9 | 1843 | peer->last_reset = PEER_DOWN_USER_SHUTDOWN; |
cb9196e7 DS |
1844 | else if (CHECK_FLAG(peer->bgp->flags, BGP_FLAG_SHUTDOWN)) |
1845 | peer->last_reset = PEER_DOWN_USER_SHUTDOWN; | |
07d1e5d9 DA |
1846 | else if (CHECK_FLAG(peer->sflags, PEER_STATUS_PREFIX_OVERFLOW)) |
1847 | peer->last_reset = PEER_DOWN_PFX_COUNT; | |
4da144f3 | 1848 | return BGP_FSM_FAILURE; |
d62a17ae | 1849 | } |
1850 | ||
1851 | /* Scrub some information that might be left over from a previous, | |
1852 | * session | |
1853 | */ | |
1854 | /* Connection information. */ | |
1855 | if (peer->su_local) { | |
1856 | sockunion_free(peer->su_local); | |
1857 | peer->su_local = NULL; | |
1858 | } | |
1859 | ||
1860 | if (peer->su_remote) { | |
1861 | sockunion_free(peer->su_remote); | |
1862 | peer->su_remote = NULL; | |
1863 | } | |
1864 | ||
1865 | /* Clear remote router-id. */ | |
975a328e | 1866 | peer->remote_id.s_addr = INADDR_ANY; |
d62a17ae | 1867 | |
1868 | /* Clear peer capability flag. */ | |
1869 | peer->cap = 0; | |
1870 | ||
1871 | /* If the peer is passive mode, force to move to Active mode. */ | |
1872 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE)) { | |
1873 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
4da144f3 | 1874 | return BGP_FSM_SUCCESS; |
d62a17ae | 1875 | } |
1876 | ||
2c1eba8e | 1877 | if (peer->bgp->vrf_id == VRF_UNKNOWN) { |
61cf4b37 | 1878 | if (bgp_debug_neighbor_events(peer)) |
af4c2728 | 1879 | flog_err( |
e50f7cfd | 1880 | EC_BGP_FSM, |
996c9314 LB |
1881 | "%s [FSM] In a VRF that is not initialised yet", |
1882 | peer->host); | |
3577f1c5 | 1883 | peer->last_reset = PEER_DOWN_VRF_UNINIT; |
4da144f3 | 1884 | return BGP_FSM_FAILURE; |
61cf4b37 PG |
1885 | } |
1886 | ||
e2d3a909 | 1887 | /* Register peer for NHT. If next hop is already resolved, proceed |
1888 | * with connection setup, else wait. | |
1889 | */ | |
1890 | if (!bgp_peer_reg_with_nht(peer)) { | |
c42eab4b DS |
1891 | if (bgp_zebra_num_connects()) { |
1892 | if (bgp_debug_neighbor_events(peer)) | |
6029afbc DS |
1893 | zlog_debug( |
1894 | "%s [FSM] Waiting for NHT, no path to neighbor present", | |
1895 | peer->host); | |
3577f1c5 | 1896 | peer->last_reset = PEER_DOWN_WAITING_NHT; |
c42eab4b | 1897 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); |
4da144f3 | 1898 | return BGP_FSM_SUCCESS; |
c42eab4b | 1899 | } |
718e3744 | 1900 | } |
d62a17ae | 1901 | |
424ab01d QY |
1902 | assert(!peer->t_write); |
1903 | assert(!peer->t_read); | |
1904 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); | |
1905 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); | |
d62a17ae | 1906 | status = bgp_connect(peer); |
1907 | ||
1908 | switch (status) { | |
1909 | case connect_error: | |
1910 | if (bgp_debug_neighbor_events(peer)) | |
1911 | zlog_debug("%s [FSM] Connect error", peer->host); | |
1912 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1913 | break; | |
1914 | case connect_success: | |
1915 | if (bgp_debug_neighbor_events(peer)) | |
1916 | zlog_debug( | |
1917 | "%s [FSM] Connect immediately success, fd %d", | |
1918 | peer->host, peer->fd); | |
6c537a18 | 1919 | |
d62a17ae | 1920 | BGP_EVENT_ADD(peer, TCP_connection_open); |
1921 | break; | |
1922 | case connect_in_progress: | |
1923 | /* To check nonblocking connect, we wait until socket is | |
1924 | readable or writable. */ | |
1925 | if (bgp_debug_neighbor_events(peer)) | |
1926 | zlog_debug( | |
1927 | "%s [FSM] Non blocking connect waiting result, fd %d", | |
1928 | peer->host, peer->fd); | |
1929 | if (peer->fd < 0) { | |
e50f7cfd | 1930 | flog_err(EC_BGP_FSM, |
a10c2872 | 1931 | "%s peer's fd is negative value %d", __func__, |
1c50c1c0 | 1932 | peer->fd); |
4da144f3 | 1933 | return BGP_FSM_FAILURE; |
d62a17ae | 1934 | } |
becedef6 | 1935 | /* |
387f984e QY |
1936 | * - when the socket becomes ready, poll() will signify POLLOUT |
1937 | * - if it fails to connect, poll() will signify POLLHUP | |
1938 | * - POLLHUP is handled as a 'read' event by thread.c | |
1939 | * | |
1940 | * therefore, we schedule both a read and a write event with | |
1941 | * bgp_connect_check() as the handler for each and cancel the | |
1942 | * unused event in that function. | |
becedef6 | 1943 | */ |
424ab01d | 1944 | thread_add_read(bm->master, bgp_connect_check, peer, peer->fd, |
387f984e QY |
1945 | &peer->t_connect_check_r); |
1946 | thread_add_write(bm->master, bgp_connect_check, peer, peer->fd, | |
1947 | &peer->t_connect_check_w); | |
d62a17ae | 1948 | break; |
1949 | } | |
4da144f3 | 1950 | return BGP_FSM_SUCCESS; |
718e3744 | 1951 | } |
1952 | ||
1953 | /* Connect retry timer is expired when the peer status is Connect. */ | |
4da144f3 | 1954 | static enum bgp_fsm_state_progress bgp_reconnect(struct peer *peer) |
718e3744 | 1955 | { |
4da144f3 DS |
1956 | enum bgp_fsm_state_progress ret; |
1957 | ||
1958 | ret = bgp_stop(peer); | |
1959 | if (ret < BGP_FSM_SUCCESS) | |
1960 | return ret; | |
1ff9a340 | 1961 | |
8c48b3b6 | 1962 | /* Send graceful restart capabilty */ |
36235319 QY |
1963 | BGP_GR_ROUTER_DETECT_AND_SEND_CAPABILITY_TO_ZEBRA(peer->bgp, |
1964 | peer->bgp->peer); | |
8c48b3b6 | 1965 | |
4da144f3 | 1966 | return bgp_start(peer); |
718e3744 | 1967 | } |
1968 | ||
4da144f3 | 1969 | static enum bgp_fsm_state_progress bgp_fsm_open(struct peer *peer) |
718e3744 | 1970 | { |
6c537a18 DS |
1971 | /* If DelayOpen is active, we may still need to send an open message */ |
1972 | if ((peer->status == Connect) || (peer->status == Active)) | |
1973 | bgp_open_send(peer); | |
1974 | ||
d62a17ae | 1975 | /* Send keepalive and make keepalive timer */ |
1976 | bgp_keepalive_send(peer); | |
718e3744 | 1977 | |
4da144f3 | 1978 | return BGP_FSM_SUCCESS; |
718e3744 | 1979 | } |
1980 | ||
397b5bde LR |
1981 | /* FSM error, unexpected event. This is error of BGP connection. So cut the |
1982 | peer and change to Idle status. */ | |
4da144f3 | 1983 | static enum bgp_fsm_state_progress bgp_fsm_event_error(struct peer *peer) |
397b5bde | 1984 | { |
1c50c1c0 QY |
1985 | flog_err(EC_BGP_FSM, "%s [FSM] unexpected packet received in state %s", |
1986 | peer->host, lookup_msg(bgp_status_msg, peer->status, NULL)); | |
397b5bde | 1987 | |
3893aeee DA |
1988 | return bgp_stop_with_notify(peer, BGP_NOTIFY_FSM_ERR, |
1989 | bgp_fsm_error_subcode(peer->status)); | |
397b5bde LR |
1990 | } |
1991 | ||
718e3744 | 1992 | /* Hold timer expire. This is error of BGP connection. So cut the |
1993 | peer and change to Idle status. */ | |
4da144f3 | 1994 | static enum bgp_fsm_state_progress bgp_fsm_holdtime_expire(struct peer *peer) |
718e3744 | 1995 | { |
d62a17ae | 1996 | if (bgp_debug_neighbor_events(peer)) |
1997 | zlog_debug("%s [FSM] Hold timer expire", peer->host); | |
718e3744 | 1998 | |
20170775 DA |
1999 | /* RFC8538 updates RFC 4724 by defining an extension that permits |
2000 | * the Graceful Restart procedures to be performed when the BGP | |
2001 | * speaker receives a BGP NOTIFICATION message or the Hold Time expires. | |
2002 | */ | |
2003 | if (peer_established(peer) && | |
2004 | bgp_has_graceful_restart_notification(peer)) | |
2005 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_MODE)) | |
2006 | SET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
2007 | ||
d62a17ae | 2008 | return bgp_stop_with_notify(peer, BGP_NOTIFY_HOLD_ERR, 0); |
718e3744 | 2009 | } |
2010 | ||
6c537a18 | 2011 | /* RFC 4271 DelayOpenTimer_Expires event */ |
4da144f3 DS |
2012 | static enum bgp_fsm_state_progress |
2013 | bgp_fsm_delayopen_timer_expire(struct peer *peer) | |
6c537a18 DS |
2014 | { |
2015 | /* Stop the DelayOpenTimer */ | |
fa5806c3 | 2016 | THREAD_OFF(peer->t_delayopen); |
6c537a18 DS |
2017 | |
2018 | /* Send open message to peer */ | |
2019 | bgp_open_send(peer); | |
2020 | ||
2021 | /* Set the HoldTimer to a large value (4 minutes) */ | |
2022 | peer->v_holdtime = 245; | |
2023 | ||
4da144f3 | 2024 | return BGP_FSM_SUCCESS; |
6c537a18 DS |
2025 | } |
2026 | ||
f009ff26 | 2027 | /* Start the selection deferral timer thread for the specified AFI, SAFI */ |
2028 | static int bgp_start_deferral_timer(struct bgp *bgp, afi_t afi, safi_t safi, | |
36235319 | 2029 | struct graceful_restart_info *gr_info) |
f009ff26 | 2030 | { |
2031 | struct afi_safi_info *thread_info; | |
2032 | ||
2033 | /* If the deferral timer is active, then increment eor count */ | |
2034 | if (gr_info->t_select_deferral) { | |
2035 | gr_info->eor_required++; | |
2036 | return 0; | |
2037 | } | |
2038 | ||
2039 | /* Start the deferral timer when the first peer enabled for the graceful | |
2040 | * restart is established | |
2041 | */ | |
2042 | if (gr_info->eor_required == 0) { | |
2043 | thread_info = XMALLOC(MTYPE_TMP, sizeof(struct afi_safi_info)); | |
f009ff26 | 2044 | |
2045 | thread_info->afi = afi; | |
2046 | thread_info->safi = safi; | |
2047 | thread_info->bgp = bgp; | |
2048 | ||
13909c4f DS |
2049 | thread_add_timer(bm->master, bgp_graceful_deferral_timer_expire, |
2050 | thread_info, bgp->select_defer_time, | |
2051 | &gr_info->t_select_deferral); | |
f009ff26 | 2052 | } |
f009ff26 | 2053 | gr_info->eor_required++; |
8c48b3b6 | 2054 | /* Send message to RIB indicating route update pending */ |
2055 | if (gr_info->af_enabled[afi][safi] == false) { | |
2056 | gr_info->af_enabled[afi][safi] = true; | |
2057 | /* Send message to RIB */ | |
2058 | bgp_zebra_update(afi, safi, bgp->vrf_id, | |
2059 | ZEBRA_CLIENT_ROUTE_UPDATE_PENDING); | |
2060 | } | |
f009ff26 | 2061 | if (BGP_DEBUG(update, UPDATE_OUT)) |
2062 | zlog_debug("Started the deferral timer for %s eor_required %d", | |
36235319 QY |
2063 | get_afi_safi_str(afi, safi, false), |
2064 | gr_info->eor_required); | |
f009ff26 | 2065 | return 0; |
2066 | } | |
2067 | ||
2068 | /* Update the graceful restart information for the specified AFI, SAFI */ | |
2069 | static int bgp_update_gr_info(struct peer *peer, afi_t afi, safi_t safi) | |
2070 | { | |
2071 | struct graceful_restart_info *gr_info; | |
2072 | struct bgp *bgp = peer->bgp; | |
2073 | int ret = 0; | |
2074 | ||
2075 | if ((afi < AFI_IP) || (afi >= AFI_MAX)) { | |
2076 | if (BGP_DEBUG(update, UPDATE_OUT)) | |
2077 | zlog_debug("%s : invalid afi %d", __func__, afi); | |
2078 | return -1; | |
2079 | } | |
2080 | ||
2081 | if ((safi < SAFI_UNICAST) || (safi > SAFI_MPLS_VPN)) { | |
2082 | if (BGP_DEBUG(update, UPDATE_OUT)) | |
2083 | zlog_debug("%s : invalid safi %d", __func__, safi); | |
2084 | return -1; | |
2085 | } | |
2086 | ||
2087 | /* Restarting router */ | |
36235319 QY |
2088 | if (BGP_PEER_GRACEFUL_RESTART_CAPABLE(peer) |
2089 | && BGP_PEER_RESTARTING_MODE(peer)) { | |
f009ff26 | 2090 | /* Check if the forwarding state is preserved */ |
892fedb6 | 2091 | if (CHECK_FLAG(bgp->flags, BGP_FLAG_GR_PRESERVE_FWD)) { |
f009ff26 | 2092 | gr_info = &(bgp->gr_info[afi][safi]); |
2093 | ret = bgp_start_deferral_timer(bgp, afi, safi, gr_info); | |
2094 | } | |
2095 | } | |
2ba1fe69 | 2096 | return ret; |
f009ff26 | 2097 | } |
2098 | ||
727c4f87 QY |
2099 | /** |
2100 | * Transition to Established state. | |
2101 | * | |
2102 | * Convert peer from stub to full fledged peer, set some timers, and generate | |
2103 | * initial updates. | |
2104 | */ | |
4da144f3 | 2105 | static enum bgp_fsm_state_progress bgp_establish(struct peer *peer) |
718e3744 | 2106 | { |
d62a17ae | 2107 | afi_t afi; |
2108 | safi_t safi; | |
2109 | int nsf_af_count = 0; | |
4da144f3 | 2110 | enum bgp_fsm_state_progress ret = BGP_FSM_SUCCESS; |
d62a17ae | 2111 | struct peer *other; |
f009ff26 | 2112 | int status; |
d62a17ae | 2113 | |
2114 | other = peer->doppelganger; | |
56b7d690 DS |
2115 | hash_release(peer->bgp->peerhash, peer); |
2116 | if (other) | |
2117 | hash_release(peer->bgp->peerhash, other); | |
2118 | ||
d62a17ae | 2119 | peer = peer_xfer_conn(peer); |
2120 | if (!peer) { | |
e50f7cfd | 2121 | flog_err(EC_BGP_CONNECT, "%%Neighbor failed in xfer_conn"); |
4da144f3 | 2122 | return BGP_FSM_FAILURE; |
93406d87 | 2123 | } |
93406d87 | 2124 | |
d62a17ae | 2125 | if (other == peer) |
4da144f3 | 2126 | ret = BGP_FSM_SUCCESS_STATE_TRANSFER; |
d62a17ae | 2127 | |
2128 | /* Reset capability open status flag. */ | |
2129 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN)) | |
2130 | SET_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN); | |
2131 | ||
2132 | /* Clear start timer value to default. */ | |
2133 | peer->v_start = BGP_INIT_START_TIMER; | |
2134 | ||
2135 | /* Increment established count. */ | |
2136 | peer->established++; | |
2137 | bgp_fsm_change_status(peer, Established); | |
2138 | ||
2139 | /* bgp log-neighbor-changes of neighbor Up */ | |
892fedb6 | 2140 | if (CHECK_FLAG(peer->bgp->flags, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { |
d62a17ae | 2141 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); |
f70c91dc | 2142 | zlog_info("%%ADJCHANGE: neighbor %pBP in vrf %s Up", peer, |
a7d91a8c DA |
2143 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) |
2144 | ? vrf->name | |
2145 | : VRF_DEFAULT_NAME) | |
2146 | : ""); | |
d62a17ae | 2147 | } |
2148 | /* assign update-group/subgroup */ | |
2149 | update_group_adjust_peer_afs(peer); | |
2150 | ||
2151 | /* graceful restart */ | |
2152 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
f009ff26 | 2153 | if (bgp_debug_neighbor_events(peer)) { |
2154 | if (BGP_PEER_RESTARTING_MODE(peer)) | |
f70c91dc | 2155 | zlog_debug("%pBP BGP_RESTARTING_MODE", peer); |
f009ff26 | 2156 | else if (BGP_PEER_HELPER_MODE(peer)) |
f70c91dc | 2157 | zlog_debug("%pBP BGP_HELPER_MODE", peer); |
f009ff26 | 2158 | } |
df8d723c DA |
2159 | |
2160 | FOREACH_AFI_SAFI_NSF (afi, safi) { | |
2161 | if (peer->afc_nego[afi][safi] && | |
2162 | CHECK_FLAG(peer->cap, PEER_CAP_RESTART_ADV) && | |
2163 | CHECK_FLAG(peer->af_cap[afi][safi], | |
2164 | PEER_CAP_RESTART_AF_RCV)) { | |
2165 | if (peer->nsf[afi][safi] && | |
2166 | !CHECK_FLAG(peer->af_cap[afi][safi], | |
2167 | PEER_CAP_RESTART_AF_PRESERVE_RCV)) | |
2168 | bgp_clear_stale_route(peer, afi, safi); | |
2169 | ||
2170 | peer->nsf[afi][safi] = 1; | |
2171 | nsf_af_count++; | |
2172 | } else { | |
2173 | if (peer->nsf[afi][safi]) | |
2174 | bgp_clear_stale_route(peer, afi, safi); | |
2175 | peer->nsf[afi][safi] = 0; | |
2176 | } | |
2177 | /* Update the graceful restart information */ | |
2178 | if (peer->afc_nego[afi][safi]) { | |
2179 | if (!BGP_SELECT_DEFER_DISABLE(peer->bgp)) { | |
2180 | status = bgp_update_gr_info(peer, afi, safi); | |
2181 | if (status < 0) | |
2182 | zlog_err( | |
2183 | "Error in updating graceful restart for %s", | |
2184 | get_afi_safi_str(afi, safi, | |
2185 | false)); | |
d62a17ae | 2186 | } else { |
df8d723c DA |
2187 | if (BGP_PEER_GRACEFUL_RESTART_CAPABLE(peer) && |
2188 | BGP_PEER_RESTARTING_MODE(peer) && | |
2189 | CHECK_FLAG(peer->bgp->flags, | |
2190 | BGP_FLAG_GR_PRESERVE_FWD)) | |
2191 | peer->bgp->gr_info[afi][safi] | |
2192 | .eor_required++; | |
f009ff26 | 2193 | } |
d62a17ae | 2194 | } |
df8d723c | 2195 | } |
d62a17ae | 2196 | |
77b34214 NT |
2197 | if (!CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV)) { |
2198 | if ((bgp_peer_gr_mode_get(peer) == PEER_GR) | |
2199 | || ((bgp_peer_gr_mode_get(peer) == PEER_GLOBAL_INHERIT) | |
2200 | && (bgp_global_gr_mode_get(peer->bgp) == GLOBAL_GR))) { | |
2201 | FOREACH_AFI_SAFI (afi, safi) | |
2202 | /* Send route processing complete | |
2203 | message to RIB */ | |
2204 | bgp_zebra_update( | |
2205 | afi, safi, peer->bgp->vrf_id, | |
2206 | ZEBRA_CLIENT_ROUTE_UPDATE_COMPLETE); | |
2207 | } | |
2208 | } else { | |
2209 | /* Peer sends R-bit. In this case, we need to send | |
2210 | * ZEBRA_CLIENT_ROUTE_UPDATE_COMPLETE to Zebra. */ | |
eea685b6 DA |
2211 | if (CHECK_FLAG(peer->cap, |
2212 | PEER_CAP_GRACEFUL_RESTART_R_BIT_RCV)) { | |
77b34214 NT |
2213 | FOREACH_AFI_SAFI (afi, safi) |
2214 | /* Send route processing complete | |
2215 | message to RIB */ | |
2216 | bgp_zebra_update( | |
2217 | afi, safi, peer->bgp->vrf_id, | |
2218 | ZEBRA_CLIENT_ROUTE_UPDATE_COMPLETE); | |
2219 | } | |
2220 | } | |
2221 | ||
794b37d5 | 2222 | peer->nsf_af_count = nsf_af_count; |
2223 | ||
d62a17ae | 2224 | if (nsf_af_count) |
2225 | SET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
2226 | else { | |
2227 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
2228 | if (peer->t_gr_stale) { | |
fa5806c3 | 2229 | THREAD_OFF(peer->t_gr_stale); |
d62a17ae | 2230 | if (bgp_debug_neighbor_events(peer)) |
2231 | zlog_debug( | |
f70c91dc DA |
2232 | "%pBP graceful restart stalepath timer stopped", |
2233 | peer); | |
d62a17ae | 2234 | } |
2235 | } | |
93406d87 | 2236 | |
d62a17ae | 2237 | if (peer->t_gr_restart) { |
fa5806c3 | 2238 | THREAD_OFF(peer->t_gr_restart); |
d62a17ae | 2239 | if (bgp_debug_neighbor_events(peer)) |
f70c91dc | 2240 | zlog_debug("%pBP graceful restart timer stopped", peer); |
d62a17ae | 2241 | } |
718e3744 | 2242 | |
9eb217ff QY |
2243 | /* Reset uptime, turn on keepalives, send current table. */ |
2244 | if (!peer->v_holdtime) | |
2245 | bgp_keepalives_on(peer); | |
2246 | ||
083ec940 | 2247 | peer->uptime = monotime(NULL); |
d62a17ae | 2248 | |
0d4532cd DA |
2249 | /* Send route-refresh when ORF is enabled. |
2250 | * Stop Long-lived Graceful Restart timers. | |
2251 | */ | |
05c7a1cc | 2252 | FOREACH_AFI_SAFI (afi, safi) { |
0d4532cd | 2253 | if (peer->t_llgr_stale[afi][safi]) { |
fa5806c3 | 2254 | THREAD_OFF(peer->t_llgr_stale[afi][safi]); |
0d4532cd DA |
2255 | if (bgp_debug_neighbor_events(peer)) |
2256 | zlog_debug( | |
f70c91dc DA |
2257 | "%pBP Long-lived stale timer stopped for afi/safi: %d/%d", |
2258 | peer, afi, safi); | |
0d4532cd DA |
2259 | } |
2260 | ||
05c7a1cc QY |
2261 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
2262 | PEER_CAP_ORF_PREFIX_SM_ADV)) { | |
d62a17ae | 2263 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc | 2264 | PEER_CAP_ORF_PREFIX_RM_RCV)) |
9af52ccf DA |
2265 | bgp_route_refresh_send( |
2266 | peer, afi, safi, ORF_TYPE_PREFIX, | |
2267 | REFRESH_IMMEDIATE, 0, | |
2268 | BGP_ROUTE_REFRESH_NORMAL); | |
05c7a1cc QY |
2269 | else if (CHECK_FLAG(peer->af_cap[afi][safi], |
2270 | PEER_CAP_ORF_PREFIX_RM_OLD_RCV)) | |
9af52ccf DA |
2271 | bgp_route_refresh_send( |
2272 | peer, afi, safi, ORF_TYPE_PREFIX_OLD, | |
2273 | REFRESH_IMMEDIATE, 0, | |
2274 | BGP_ROUTE_REFRESH_NORMAL); | |
05c7a1cc QY |
2275 | } |
2276 | } | |
d62a17ae | 2277 | |
2278 | /* First update is deferred until ORF or ROUTE-REFRESH is received */ | |
05c7a1cc QY |
2279 | FOREACH_AFI_SAFI (afi, safi) { |
2280 | if (CHECK_FLAG(peer->af_cap[afi][safi], | |
2281 | PEER_CAP_ORF_PREFIX_RM_ADV)) | |
d62a17ae | 2282 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc QY |
2283 | PEER_CAP_ORF_PREFIX_SM_RCV) |
2284 | || CHECK_FLAG(peer->af_cap[afi][safi], | |
2285 | PEER_CAP_ORF_PREFIX_SM_OLD_RCV)) | |
2286 | SET_FLAG(peer->af_sflags[afi][safi], | |
2287 | PEER_STATUS_ORF_WAIT_REFRESH); | |
2288 | } | |
d62a17ae | 2289 | |
2290 | bgp_announce_peer(peer); | |
2291 | ||
2292 | /* Start the route advertisement timer to send updates to the peer - if | |
2293 | * BGP | |
2294 | * is not in read-only mode. If it is, the timer will be started at the | |
2295 | * end | |
2296 | * of read-only mode. | |
2297 | */ | |
2298 | if (!bgp_update_delay_active(peer->bgp)) { | |
fa5806c3 | 2299 | THREAD_OFF(peer->t_routeadv); |
d62a17ae | 2300 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); |
2301 | } | |
718e3744 | 2302 | |
d62a17ae | 2303 | if (peer->doppelganger && (peer->doppelganger->status != Deleted)) { |
2304 | if (bgp_debug_neighbor_events(peer)) | |
2305 | zlog_debug( | |
2306 | "[Event] Deleting stub connection for peer %s", | |
2307 | peer->host); | |
2308 | ||
2309 | if (peer->doppelganger->status > Active) | |
2310 | bgp_notify_send(peer->doppelganger, BGP_NOTIFY_CEASE, | |
2311 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
2312 | else | |
2313 | peer_delete(peer->doppelganger); | |
718e3744 | 2314 | } |
2315 | ||
19bd3dff DS |
2316 | /* |
2317 | * If we are replacing the old peer for a doppelganger | |
2318 | * then switch it around in the bgp->peerhash | |
2319 | * the doppelgangers su and this peer's su are the same | |
2320 | * so the hash_release is the same for either. | |
2321 | */ | |
8e3aae66 | 2322 | (void)hash_get(peer->bgp->peerhash, peer, hash_alloc_intern); |
19bd3dff | 2323 | |
21bfce98 RZ |
2324 | /* Start BFD peer if not already running. */ |
2325 | if (peer->bfd_config) | |
2326 | bgp_peer_bfd_update_source(peer); | |
2327 | ||
d62a17ae | 2328 | return ret; |
718e3744 | 2329 | } |
2330 | ||
2331 | /* Keepalive packet is received. */ | |
4da144f3 | 2332 | static enum bgp_fsm_state_progress bgp_fsm_keepalive(struct peer *peer) |
718e3744 | 2333 | { |
fa5806c3 | 2334 | THREAD_OFF(peer->t_holdtime); |
4da144f3 | 2335 | return BGP_FSM_SUCCESS; |
718e3744 | 2336 | } |
2337 | ||
2338 | /* Update packet is received. */ | |
4da144f3 | 2339 | static enum bgp_fsm_state_progress bgp_fsm_update(struct peer *peer) |
718e3744 | 2340 | { |
fa5806c3 | 2341 | THREAD_OFF(peer->t_holdtime); |
4da144f3 | 2342 | return BGP_FSM_SUCCESS; |
718e3744 | 2343 | } |
2344 | ||
2345 | /* This is empty event. */ | |
4da144f3 | 2346 | static enum bgp_fsm_state_progress bgp_ignore(struct peer *peer) |
718e3744 | 2347 | { |
af4c2728 | 2348 | flog_err( |
e50f7cfd | 2349 | EC_BGP_FSM, |
d62a17ae | 2350 | "%s [FSM] Ignoring event %s in state %s, prior events %s, %s, fd %d", |
2351 | peer->host, bgp_event_str[peer->cur_event], | |
2352 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
2353 | bgp_event_str[peer->last_event], | |
2354 | bgp_event_str[peer->last_major_event], peer->fd); | |
4da144f3 | 2355 | return BGP_FSM_SUCCESS; |
718e3744 | 2356 | } |
6b0655a2 | 2357 | |
6403814c | 2358 | /* This is to handle unexpected events.. */ |
4da144f3 | 2359 | static enum bgp_fsm_state_progress bgp_fsm_exception(struct peer *peer) |
6403814c | 2360 | { |
af4c2728 | 2361 | flog_err( |
e50f7cfd | 2362 | EC_BGP_FSM, |
d62a17ae | 2363 | "%s [FSM] Unexpected event %s in state %s, prior events %s, %s, fd %d", |
2364 | peer->host, bgp_event_str[peer->cur_event], | |
2365 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
2366 | bgp_event_str[peer->last_event], | |
2367 | bgp_event_str[peer->last_major_event], peer->fd); | |
4da144f3 | 2368 | return bgp_stop(peer); |
6403814c DS |
2369 | } |
2370 | ||
f8dcd38d | 2371 | void bgp_fsm_nht_update(struct peer *peer, bool has_valid_nexthops) |
fc9a856f | 2372 | { |
d62a17ae | 2373 | if (!peer) |
2374 | return; | |
2375 | ||
2376 | switch (peer->status) { | |
2377 | case Idle: | |
f8dcd38d | 2378 | if (has_valid_nexthops) |
d62a17ae | 2379 | BGP_EVENT_ADD(peer, BGP_Start); |
2380 | break; | |
2381 | case Connect: | |
f8dcd38d | 2382 | if (!has_valid_nexthops) { |
fa5806c3 | 2383 | THREAD_OFF(peer->t_connect); |
d62a17ae | 2384 | BGP_EVENT_ADD(peer, TCP_fatal_error); |
2385 | } | |
2386 | break; | |
2387 | case Active: | |
f8dcd38d | 2388 | if (has_valid_nexthops) { |
fa5806c3 | 2389 | THREAD_OFF(peer->t_connect); |
d62a17ae | 2390 | BGP_EVENT_ADD(peer, ConnectRetry_timer_expired); |
2391 | } | |
2392 | break; | |
2393 | case OpenSent: | |
2394 | case OpenConfirm: | |
2395 | case Established: | |
f8dcd38d | 2396 | if (!has_valid_nexthops |
f852eb98 PG |
2397 | && (peer->gtsm_hops == BGP_GTSM_HOPS_CONNECTED |
2398 | || peer->bgp->fast_convergence)) | |
d62a17ae | 2399 | BGP_EVENT_ADD(peer, TCP_fatal_error); |
2400 | case Clearing: | |
2401 | case Deleted: | |
2402 | default: | |
2403 | break; | |
fc9a856f | 2404 | } |
fc9a856f DS |
2405 | } |
2406 | ||
718e3744 | 2407 | /* Finite State Machine structure */ |
fda1d3e0 | 2408 | static const struct { |
4da144f3 | 2409 | enum bgp_fsm_state_progress (*func)(struct peer *); |
8398b5d5 | 2410 | enum bgp_fsm_status next_state; |
d62a17ae | 2411 | } FSM[BGP_STATUS_MAX - 1][BGP_EVENTS_MAX - 1] = { |
2412 | { | |
2413 | /* Idle state: In Idle state, all events other than BGP_Start is | |
2414 | ignored. With BGP_Start event, finite state machine calls | |
2415 | bgp_start(). */ | |
2416 | {bgp_start, Connect}, /* BGP_Start */ | |
2417 | {bgp_stop, Idle}, /* BGP_Stop */ | |
2418 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
6c537a18 | 2419 | {bgp_stop, Idle}, /* TCP_connection_open_w_delay */ |
d62a17ae | 2420 | {bgp_stop, Idle}, /* TCP_connection_closed */ |
2421 | {bgp_ignore, Idle}, /* TCP_connection_open_failed */ | |
2422 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
2423 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ | |
2424 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
2425 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
6c537a18 | 2426 | {bgp_ignore, Idle}, /* DelayOpen_timer_expired */ |
d62a17ae | 2427 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ |
2428 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
2429 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
2430 | {bgp_ignore, Idle}, /* Receive_NOTIFICATION_message */ | |
2431 | {bgp_ignore, Idle}, /* Clearing_Completed */ | |
2432 | }, | |
2433 | { | |
2434 | /* Connect */ | |
2435 | {bgp_ignore, Connect}, /* BGP_Start */ | |
2436 | {bgp_stop, Idle}, /* BGP_Stop */ | |
2437 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
6c537a18 DS |
2438 | {bgp_connect_success_w_delayopen, |
2439 | Connect}, /* TCP_connection_open_w_delay */ | |
4da144f3 | 2440 | {bgp_stop, Idle}, /* TCP_connection_closed */ |
d62a17ae | 2441 | {bgp_connect_fail, Active}, /* TCP_connection_open_failed */ |
2442 | {bgp_connect_fail, Idle}, /* TCP_fatal_error */ | |
2443 | {bgp_reconnect, Connect}, /* ConnectRetry_timer_expired */ | |
4da144f3 DS |
2444 | {bgp_fsm_exception, Idle}, /* Hold_Timer_expired */ |
2445 | {bgp_fsm_exception, Idle}, /* KeepAlive_timer_expired */ | |
6c537a18 DS |
2446 | {bgp_fsm_delayopen_timer_expire, |
2447 | OpenSent}, /* DelayOpen_timer_expired */ | |
2448 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ | |
4da144f3 DS |
2449 | {bgp_fsm_exception, Idle}, /* Receive_KEEPALIVE_message */ |
2450 | {bgp_fsm_exception, Idle}, /* Receive_UPDATE_message */ | |
2451 | {bgp_stop, Idle}, /* Receive_NOTIFICATION_message */ | |
2452 | {bgp_fsm_exception, Idle}, /* Clearing_Completed */ | |
d62a17ae | 2453 | }, |
2454 | { | |
2455 | /* Active, */ | |
2456 | {bgp_ignore, Active}, /* BGP_Start */ | |
2457 | {bgp_stop, Idle}, /* BGP_Stop */ | |
2458 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
6c537a18 | 2459 | {bgp_connect_success_w_delayopen, |
4da144f3 DS |
2460 | Active}, /* TCP_connection_open_w_delay */ |
2461 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
2462 | {bgp_ignore, Active}, /* TCP_connection_open_failed */ | |
2463 | {bgp_fsm_exception, Idle}, /* TCP_fatal_error */ | |
2464 | {bgp_start, Connect}, /* ConnectRetry_timer_expired */ | |
2465 | {bgp_fsm_exception, Idle}, /* Hold_Timer_expired */ | |
2466 | {bgp_fsm_exception, Idle}, /* KeepAlive_timer_expired */ | |
6c537a18 DS |
2467 | {bgp_fsm_delayopen_timer_expire, |
2468 | OpenSent}, /* DelayOpen_timer_expired */ | |
2469 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ | |
4da144f3 DS |
2470 | {bgp_fsm_exception, Idle}, /* Receive_KEEPALIVE_message */ |
2471 | {bgp_fsm_exception, Idle}, /* Receive_UPDATE_message */ | |
2472 | {bgp_fsm_exception, Idle}, /* Receive_NOTIFICATION_message */ | |
2473 | {bgp_fsm_exception, Idle}, /* Clearing_Completed */ | |
d62a17ae | 2474 | }, |
2475 | { | |
2476 | /* OpenSent, */ | |
4da144f3 DS |
2477 | {bgp_ignore, OpenSent}, /* BGP_Start */ |
2478 | {bgp_stop, Idle}, /* BGP_Stop */ | |
2479 | {bgp_stop, Active}, /* TCP_connection_open */ | |
2480 | {bgp_fsm_exception, Idle}, /* TCP_connection_open_w_delay */ | |
2481 | {bgp_stop, Active}, /* TCP_connection_closed */ | |
2482 | {bgp_stop, Active}, /* TCP_connection_open_failed */ | |
2483 | {bgp_stop, Active}, /* TCP_fatal_error */ | |
2484 | {bgp_fsm_exception, Idle}, /* ConnectRetry_timer_expired */ | |
d62a17ae | 2485 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ |
4da144f3 DS |
2486 | {bgp_fsm_exception, Idle}, /* KeepAlive_timer_expired */ |
2487 | {bgp_fsm_exception, Idle}, /* DelayOpen_timer_expired */ | |
d62a17ae | 2488 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ |
2489 | {bgp_fsm_event_error, Idle}, /* Receive_KEEPALIVE_message */ | |
2490 | {bgp_fsm_event_error, Idle}, /* Receive_UPDATE_message */ | |
53b4aaec | 2491 | {bgp_fsm_event_error, Idle}, /* Receive_NOTIFICATION_message */ |
4da144f3 | 2492 | {bgp_fsm_exception, Idle}, /* Clearing_Completed */ |
d62a17ae | 2493 | }, |
2494 | { | |
2495 | /* OpenConfirm, */ | |
2496 | {bgp_ignore, OpenConfirm}, /* BGP_Start */ | |
4da144f3 DS |
2497 | {bgp_stop, Idle}, /* BGP_Stop */ |
2498 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
2499 | {bgp_fsm_exception, Idle}, /* TCP_connection_open_w_delay */ | |
2500 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
2501 | {bgp_stop, Idle}, /* TCP_connection_open_failed */ | |
2502 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
2503 | {bgp_fsm_exception, Idle}, /* ConnectRetry_timer_expired */ | |
d62a17ae | 2504 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ |
2505 | {bgp_ignore, OpenConfirm}, /* KeepAlive_timer_expired */ | |
4da144f3 DS |
2506 | {bgp_fsm_exception, Idle}, /* DelayOpen_timer_expired */ |
2507 | {bgp_fsm_exception, Idle}, /* Receive_OPEN_message */ | |
d62a17ae | 2508 | {bgp_establish, Established}, /* Receive_KEEPALIVE_message */ |
4da144f3 | 2509 | {bgp_fsm_exception, Idle}, /* Receive_UPDATE_message */ |
d62a17ae | 2510 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ |
4da144f3 | 2511 | {bgp_fsm_exception, Idle}, /* Clearing_Completed */ |
d62a17ae | 2512 | }, |
2513 | { | |
2514 | /* Established, */ | |
2515 | {bgp_ignore, Established}, /* BGP_Start */ | |
4da144f3 DS |
2516 | {bgp_stop, Clearing}, /* BGP_Stop */ |
2517 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
2518 | {bgp_fsm_exception, Idle}, /* TCP_connection_open_w_delay */ | |
2519 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
2520 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
2521 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
2522 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
d62a17ae | 2523 | {bgp_fsm_holdtime_expire, Clearing}, /* Hold_Timer_expired */ |
03014d48 | 2524 | {bgp_ignore, Established}, /* KeepAlive_timer_expired */ |
4da144f3 DS |
2525 | {bgp_fsm_exception, Idle}, /* DelayOpen_timer_expired */ |
2526 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
d62a17ae | 2527 | {bgp_fsm_keepalive, |
2528 | Established}, /* Receive_KEEPALIVE_message */ | |
2529 | {bgp_fsm_update, Established}, /* Receive_UPDATE_message */ | |
2530 | {bgp_stop_with_error, | |
4da144f3 DS |
2531 | Clearing}, /* Receive_NOTIFICATION_message */ |
2532 | {bgp_fsm_exception, Idle}, /* Clearing_Completed */ | |
d62a17ae | 2533 | }, |
2534 | { | |
2535 | /* Clearing, */ | |
2536 | {bgp_ignore, Clearing}, /* BGP_Start */ | |
4da144f3 DS |
2537 | {bgp_stop, Clearing}, /* BGP_Stop */ |
2538 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
2539 | {bgp_stop, Clearing}, /* TCP_connection_open_w_delay */ | |
2540 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
2541 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
2542 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
2543 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
2544 | {bgp_stop, Clearing}, /* Hold_Timer_expired */ | |
2545 | {bgp_stop, Clearing}, /* KeepAlive_timer_expired */ | |
2546 | {bgp_stop, Clearing}, /* DelayOpen_timer_expired */ | |
2547 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
2548 | {bgp_stop, Clearing}, /* Receive_KEEPALIVE_message */ | |
2549 | {bgp_stop, Clearing}, /* Receive_UPDATE_message */ | |
2550 | {bgp_stop, Clearing}, /* Receive_NOTIFICATION_message */ | |
d62a17ae | 2551 | {bgp_clearing_completed, Idle}, /* Clearing_Completed */ |
2552 | }, | |
2553 | { | |
2554 | /* Deleted, */ | |
2555 | {bgp_ignore, Deleted}, /* BGP_Start */ | |
2556 | {bgp_ignore, Deleted}, /* BGP_Stop */ | |
2557 | {bgp_ignore, Deleted}, /* TCP_connection_open */ | |
6c537a18 | 2558 | {bgp_ignore, Deleted}, /* TCP_connection_open_w_delay */ |
d62a17ae | 2559 | {bgp_ignore, Deleted}, /* TCP_connection_closed */ |
2560 | {bgp_ignore, Deleted}, /* TCP_connection_open_failed */ | |
2561 | {bgp_ignore, Deleted}, /* TCP_fatal_error */ | |
2562 | {bgp_ignore, Deleted}, /* ConnectRetry_timer_expired */ | |
2563 | {bgp_ignore, Deleted}, /* Hold_Timer_expired */ | |
2564 | {bgp_ignore, Deleted}, /* KeepAlive_timer_expired */ | |
6c537a18 | 2565 | {bgp_ignore, Deleted}, /* DelayOpen_timer_expired */ |
d62a17ae | 2566 | {bgp_ignore, Deleted}, /* Receive_OPEN_message */ |
2567 | {bgp_ignore, Deleted}, /* Receive_KEEPALIVE_message */ | |
2568 | {bgp_ignore, Deleted}, /* Receive_UPDATE_message */ | |
2569 | {bgp_ignore, Deleted}, /* Receive_NOTIFICATION_message */ | |
2570 | {bgp_ignore, Deleted}, /* Clearing_Completed */ | |
2571 | }, | |
718e3744 | 2572 | }; |
2573 | ||
718e3744 | 2574 | /* Execute event process. */ |
cc9f21da | 2575 | void bgp_event(struct thread *thread) |
718e3744 | 2576 | { |
d1060698 | 2577 | enum bgp_fsm_events event; |
d62a17ae | 2578 | struct peer *peer; |
718e3744 | 2579 | |
d62a17ae | 2580 | peer = THREAD_ARG(thread); |
2581 | event = THREAD_VAL(thread); | |
718e3744 | 2582 | |
69ef3f31 | 2583 | peer_lock(peer); |
cc9f21da | 2584 | bgp_event_update(peer, event); |
69ef3f31 | 2585 | peer_unlock(peer); |
1ff9a340 DS |
2586 | } |
2587 | ||
d1060698 | 2588 | int bgp_event_update(struct peer *peer, enum bgp_fsm_events event) |
1ff9a340 | 2589 | { |
8398b5d5 | 2590 | enum bgp_fsm_status next; |
4da144f3 | 2591 | enum bgp_fsm_state_progress ret = 0; |
d62a17ae | 2592 | struct peer *other; |
2593 | int passive_conn = 0; | |
2594 | int dyn_nbr; | |
2595 | ||
d8151687 QY |
2596 | /* default return code */ |
2597 | ret = FSM_PEER_NOOP; | |
2598 | ||
d62a17ae | 2599 | other = peer->doppelganger; |
2600 | passive_conn = | |
2601 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) ? 1 : 0; | |
2602 | dyn_nbr = peer_dynamic_neighbor(peer); | |
2603 | ||
2604 | /* Logging this event. */ | |
2605 | next = FSM[peer->status - 1][event - 1].next_state; | |
2606 | ||
2607 | if (bgp_debug_neighbor_events(peer) && peer->status != next) | |
2608 | zlog_debug("%s [FSM] %s (%s->%s), fd %d", peer->host, | |
2609 | bgp_event_str[event], | |
2610 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
2611 | lookup_msg(bgp_status_msg, next, NULL), peer->fd); | |
2612 | ||
2613 | peer->last_event = peer->cur_event; | |
2614 | peer->cur_event = event; | |
2615 | ||
2616 | /* Call function. */ | |
2617 | if (FSM[peer->status - 1][event - 1].func) | |
2618 | ret = (*(FSM[peer->status - 1][event - 1].func))(peer); | |
2619 | ||
4da144f3 DS |
2620 | if (ret >= BGP_FSM_SUCCESS) { |
2621 | if (ret == BGP_FSM_SUCCESS_STATE_TRANSFER && | |
2622 | next == Established) { | |
d62a17ae | 2623 | /* The case when doppelganger swap accurred in |
2624 | bgp_establish. | |
2625 | Update the peer pointer accordingly */ | |
d8151687 | 2626 | ret = FSM_PEER_TRANSFERRED; |
d62a17ae | 2627 | peer = other; |
2628 | } | |
2629 | ||
2630 | /* If status is changed. */ | |
d8151687 | 2631 | if (next != peer->status) { |
d62a17ae | 2632 | bgp_fsm_change_status(peer, next); |
2633 | ||
becedef6 QY |
2634 | /* |
2635 | * If we're going to ESTABLISHED then we executed a | |
2636 | * peer transfer. In this case we can either return | |
2637 | * FSM_PEER_TRANSITIONED or FSM_PEER_TRANSFERRED. | |
2638 | * Opting for TRANSFERRED since transfer implies | |
2639 | * session establishment. | |
2640 | */ | |
d8151687 QY |
2641 | if (ret != FSM_PEER_TRANSFERRED) |
2642 | ret = FSM_PEER_TRANSITIONED; | |
2643 | } | |
2644 | ||
d62a17ae | 2645 | /* Make sure timer is set. */ |
2646 | bgp_timer_set(peer); | |
2647 | ||
bea01226 | 2648 | } else { |
becedef6 QY |
2649 | /* |
2650 | * If we got a return value of -1, that means there was an | |
2651 | * error, restart the FSM. Since bgp_stop() was called on the | |
2652 | * peer. only a few fields are safe to access here. In any case | |
2653 | * we need to indicate that the peer was stopped in the return | |
2654 | * code. | |
2655 | */ | |
4da144f3 DS |
2656 | if (!dyn_nbr && !passive_conn && peer->bgp && |
2657 | ret != BGP_FSM_FAILURE_AND_DELETE) { | |
af4c2728 | 2658 | flog_err( |
e50f7cfd | 2659 | EC_BGP_FSM, |
3efd0893 | 2660 | "%s [FSM] Failure handling event %s in state %s, prior events %s, %s, fd %d", |
bea01226 QY |
2661 | peer->host, bgp_event_str[peer->cur_event], |
2662 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
2663 | bgp_event_str[peer->last_event], | |
2664 | bgp_event_str[peer->last_major_event], | |
2665 | peer->fd); | |
2666 | bgp_stop(peer); | |
2667 | bgp_fsm_change_status(peer, Idle); | |
2668 | bgp_timer_set(peer); | |
2669 | } | |
2670 | ret = FSM_PEER_STOPPED; | |
d62a17ae | 2671 | } |
bea01226 | 2672 | |
d62a17ae | 2673 | return ret; |
718e3744 | 2674 | } |
794b37d5 | 2675 | /* BGP GR Code */ |
2676 | ||
2677 | int bgp_gr_lookup_n_update_all_peer(struct bgp *bgp, | |
36235319 QY |
2678 | enum global_mode global_new_state, |
2679 | enum global_mode global_old_state) | |
794b37d5 | 2680 | { |
2681 | struct peer *peer = {0}; | |
2682 | struct listnode *node = {0}; | |
2683 | struct listnode *nnode = {0}; | |
36235319 | 2684 | enum peer_mode peer_old_state = PEER_INVALID; |
794b37d5 | 2685 | |
2686 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) { | |
2687 | ||
2688 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
36235319 QY |
2689 | zlog_debug("%s [BGP_GR] Peer: (%s) :", __func__, |
2690 | peer->host); | |
794b37d5 | 2691 | |
2692 | peer_old_state = bgp_peer_gr_mode_get(peer); | |
2693 | ||
2694 | if (peer_old_state == PEER_GLOBAL_INHERIT) { | |
2695 | ||
36235319 QY |
2696 | /* |
2697 | *Reset only these peers and send a | |
2698 | *new open message with the change capabilities. | |
2699 | *Considering the mode to be "global_new_state" and | |
2700 | *do all operation accordingly | |
2701 | */ | |
794b37d5 | 2702 | |
2703 | switch (global_new_state) { | |
794b37d5 | 2704 | case GLOBAL_HELPER: |
794b37d5 | 2705 | BGP_PEER_GR_HELPER_ENABLE(peer); |
2706 | break; | |
2707 | case GLOBAL_GR: | |
794b37d5 | 2708 | BGP_PEER_GR_ENABLE(peer); |
2709 | break; | |
2710 | case GLOBAL_DISABLE: | |
794b37d5 | 2711 | BGP_PEER_GR_DISABLE(peer); |
2712 | break; | |
2713 | case GLOBAL_INVALID: | |
36235319 QY |
2714 | zlog_debug("%s [BGP_GR] GLOBAL_INVALID", |
2715 | __func__); | |
794b37d5 | 2716 | return BGP_ERR_GR_OPERATION_FAILED; |
794b37d5 | 2717 | } |
2718 | } | |
2719 | } | |
2720 | ||
2721 | bgp->global_gr_present_state = global_new_state; | |
2722 | ||
794b37d5 | 2723 | return BGP_GR_SUCCESS; |
2724 | } | |
2725 | ||
2ba1fe69 | 2726 | int bgp_gr_update_all(struct bgp *bgp, int global_gr_cmd) |
794b37d5 | 2727 | { |
2728 | enum global_mode global_new_state = GLOBAL_INVALID; | |
2729 | enum global_mode global_old_state = GLOBAL_INVALID; | |
2730 | ||
2731 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
36235319 QY |
2732 | zlog_debug("%s [BGP_GR]START: global_gr_cmd :%s:", __func__, |
2733 | print_global_gr_cmd(global_gr_cmd)); | |
794b37d5 | 2734 | |
2735 | global_old_state = bgp_global_gr_mode_get(bgp); | |
2736 | ||
2ba1fe69 | 2737 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
36235319 QY |
2738 | zlog_debug("[BGP_GR] global_old_gr_state :%s:", |
2739 | print_global_gr_mode(global_old_state)); | |
794b37d5 | 2740 | |
2ba1fe69 | 2741 | if (global_old_state != GLOBAL_INVALID) { |
794b37d5 | 2742 | global_new_state = |
2ba1fe69 | 2743 | bgp->GLOBAL_GR_FSM[global_old_state][global_gr_cmd]; |
2744 | ||
2745 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
36235319 QY |
2746 | zlog_debug("[BGP_GR] global_new_gr_state :%s:", |
2747 | print_global_gr_mode(global_new_state)); | |
794b37d5 | 2748 | } else { |
36235319 QY |
2749 | zlog_err("%s [BGP_GR] global_old_state == GLOBAL_INVALID", |
2750 | __func__); | |
794b37d5 | 2751 | return BGP_ERR_GR_OPERATION_FAILED; |
2752 | } | |
2753 | ||
2754 | if (global_new_state == GLOBAL_INVALID) { | |
36235319 QY |
2755 | zlog_err("%s [BGP_GR] global_new_state == GLOBAL_INVALID", |
2756 | __func__); | |
794b37d5 | 2757 | return BGP_ERR_GR_INVALID_CMD; |
2758 | } | |
2759 | if (global_new_state == global_old_state) { | |
2760 | /* Trace msg */ | |
2ba1fe69 | 2761 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
2762 | zlog_debug( | |
36235319 QY |
2763 | "%s [BGP_GR] global_new_state == global_old_state :%s", |
2764 | __func__, | |
2765 | print_global_gr_mode(global_new_state)); | |
794b37d5 | 2766 | return BGP_GR_NO_OPERATION; |
2767 | } | |
2768 | ||
36235319 QY |
2769 | return bgp_gr_lookup_n_update_all_peer(bgp, global_new_state, |
2770 | global_old_state); | |
794b37d5 | 2771 | } |
2772 | ||
2ba1fe69 | 2773 | const char *print_peer_gr_mode(enum peer_mode pr_mode) |
2774 | { | |
2775 | const char *peer_gr_mode = NULL; | |
2776 | ||
2777 | switch (pr_mode) { | |
2778 | case PEER_HELPER: | |
2779 | peer_gr_mode = "PEER_HELPER"; | |
2780 | break; | |
2781 | case PEER_GR: | |
2782 | peer_gr_mode = "PEER_GR"; | |
2783 | break; | |
2784 | case PEER_DISABLE: | |
2785 | peer_gr_mode = "PEER_DISABLE"; | |
2786 | break; | |
2787 | case PEER_INVALID: | |
2788 | peer_gr_mode = "PEER_INVALID"; | |
2789 | break; | |
2790 | case PEER_GLOBAL_INHERIT: | |
2791 | peer_gr_mode = "PEER_GLOBAL_INHERIT"; | |
2792 | break; | |
2793 | } | |
2794 | ||
2795 | return peer_gr_mode; | |
2796 | } | |
2797 | ||
2798 | const char *print_peer_gr_cmd(enum peer_gr_command pr_gr_cmd) | |
2799 | { | |
2800 | const char *peer_gr_cmd = NULL; | |
2801 | ||
2802 | switch (pr_gr_cmd) { | |
2803 | case PEER_GR_CMD: | |
2804 | peer_gr_cmd = "PEER_GR_CMD"; | |
2805 | break; | |
2806 | case NO_PEER_GR_CMD: | |
2807 | peer_gr_cmd = "NO_PEER_GR_CMD"; | |
2808 | break; | |
2809 | case PEER_DISABLE_CMD: | |
b6e410f7 | 2810 | peer_gr_cmd = "PEER_DISABLE_GR_CMD"; |
2ba1fe69 | 2811 | break; |
2812 | case NO_PEER_DISABLE_CMD: | |
b6e410f7 | 2813 | peer_gr_cmd = "NO_PEER_DISABLE_GR_CMD"; |
2ba1fe69 | 2814 | break; |
2815 | case PEER_HELPER_CMD: | |
2816 | peer_gr_cmd = "PEER_HELPER_CMD"; | |
2817 | break; | |
2818 | case NO_PEER_HELPER_CMD: | |
2819 | peer_gr_cmd = "NO_PEER_HELPER_CMD"; | |
2820 | break; | |
2821 | } | |
2822 | ||
2823 | return peer_gr_cmd; | |
2824 | } | |
2825 | ||
2826 | const char *print_global_gr_mode(enum global_mode gl_mode) | |
2827 | { | |
2828 | const char *global_gr_mode = NULL; | |
2829 | ||
2830 | switch (gl_mode) { | |
2831 | case GLOBAL_HELPER: | |
2832 | global_gr_mode = "GLOBAL_HELPER"; | |
2833 | break; | |
2834 | case GLOBAL_GR: | |
2835 | global_gr_mode = "GLOBAL_GR"; | |
2836 | break; | |
2837 | case GLOBAL_DISABLE: | |
2838 | global_gr_mode = "GLOBAL_DISABLE"; | |
2839 | break; | |
2840 | case GLOBAL_INVALID: | |
2841 | global_gr_mode = "GLOBAL_INVALID"; | |
2842 | break; | |
2843 | } | |
2844 | ||
2845 | return global_gr_mode; | |
2846 | } | |
2847 | ||
2848 | const char *print_global_gr_cmd(enum global_gr_command gl_gr_cmd) | |
2849 | { | |
2850 | const char *global_gr_cmd = NULL; | |
2851 | ||
2852 | switch (gl_gr_cmd) { | |
2853 | case GLOBAL_GR_CMD: | |
2854 | global_gr_cmd = "GLOBAL_GR_CMD"; | |
2855 | break; | |
2856 | case NO_GLOBAL_GR_CMD: | |
2857 | global_gr_cmd = "NO_GLOBAL_GR_CMD"; | |
2858 | break; | |
2859 | case GLOBAL_DISABLE_CMD: | |
2860 | global_gr_cmd = "GLOBAL_DISABLE_CMD"; | |
2861 | break; | |
2862 | case NO_GLOBAL_DISABLE_CMD: | |
2863 | global_gr_cmd = "NO_GLOBAL_DISABLE_CMD"; | |
2864 | break; | |
2865 | } | |
2866 | ||
2867 | return global_gr_cmd; | |
2868 | } | |
2869 | ||
794b37d5 | 2870 | enum global_mode bgp_global_gr_mode_get(struct bgp *bgp) |
2871 | { | |
2872 | return bgp->global_gr_present_state; | |
2873 | } | |
2874 | ||
2875 | enum peer_mode bgp_peer_gr_mode_get(struct peer *peer) | |
2876 | { | |
2877 | return peer->peer_gr_present_state; | |
2878 | } | |
2879 | ||
36235319 | 2880 | int bgp_neighbor_graceful_restart(struct peer *peer, int peer_gr_cmd) |
794b37d5 | 2881 | { |
36235319 QY |
2882 | enum peer_mode peer_new_state = PEER_INVALID; |
2883 | enum peer_mode peer_old_state = PEER_INVALID; | |
794b37d5 | 2884 | struct bgp_peer_gr peer_state; |
2885 | int result = BGP_GR_FAILURE; | |
2886 | ||
2887 | /* | |
2888 | * fetch peer_old_state from peer structure also | |
2889 | * fetch global_old_state from bgp structure, | |
2890 | * peer had a back pointer to bgpo struct ; | |
2891 | */ | |
2892 | ||
2893 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
36235319 QY |
2894 | zlog_debug("%s [BGP_GR] START:Peer: (%s) : peer_gr_cmd :%s:", |
2895 | __func__, peer->host, | |
2896 | print_peer_gr_cmd(peer_gr_cmd)); | |
794b37d5 | 2897 | |
2898 | peer_old_state = bgp_peer_gr_mode_get(peer); | |
2899 | ||
2900 | if (peer_old_state == PEER_INVALID) { | |
36235319 | 2901 | zlog_debug("[BGP_GR] peer_old_state == Invalid state !"); |
794b37d5 | 2902 | return BGP_ERR_GR_OPERATION_FAILED; |
2903 | } | |
2904 | ||
2ba1fe69 | 2905 | peer_state = peer->PEER_GR_FSM[peer_old_state][peer_gr_cmd]; |
794b37d5 | 2906 | peer_new_state = peer_state.next_state; |
2907 | ||
2908 | if (peer_new_state == PEER_INVALID) { | |
794b37d5 | 2909 | zlog_debug( |
2ba1fe69 | 2910 | "[BGP_GR] Invalid bgp graceful restart command used !"); |
794b37d5 | 2911 | return BGP_ERR_GR_INVALID_CMD; |
2912 | } | |
2913 | ||
2914 | if (peer_new_state != peer_old_state) { | |
36235319 QY |
2915 | result = peer_state.action_fun(peer, peer_old_state, |
2916 | peer_new_state); | |
794b37d5 | 2917 | } else { |
2ba1fe69 | 2918 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
2919 | zlog_debug( | |
36235319 | 2920 | "[BGP_GR] peer_old_state == peer_new_state !"); |
794b37d5 | 2921 | return BGP_GR_NO_OPERATION; |
2922 | } | |
2923 | ||
2924 | if (result == BGP_GR_SUCCESS) { | |
2925 | ||
2926 | /* Update the mode i.e peer_new_state into the peer structure */ | |
2927 | peer->peer_gr_present_state = peer_new_state; | |
794b37d5 | 2928 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
36235319 | 2929 | zlog_debug( |
2089dd80 | 2930 | "[BGP_GR] Successfully change the state of the peer to : %s : !", |
36235319 | 2931 | print_peer_gr_mode(peer_new_state)); |
794b37d5 | 2932 | |
2933 | return BGP_GR_SUCCESS; | |
2934 | } | |
2935 | ||
2936 | return result; | |
2937 | } | |
2938 | ||
36235319 QY |
2939 | unsigned int bgp_peer_gr_action(struct peer *peer, int old_peer_state, |
2940 | int new_peer_state) | |
794b37d5 | 2941 | { |
2942 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2943 | zlog_debug( | |
2ba1fe69 | 2944 | "%s [BGP_GR] Move peer from old_peer_state :%s: to new_peer_state :%s: !!!!", |
2945 | __func__, print_peer_gr_mode(old_peer_state), | |
2946 | print_peer_gr_mode(new_peer_state)); | |
794b37d5 | 2947 | |
2948 | int bgp_gr_global_mode = GLOBAL_INVALID; | |
2949 | unsigned int ret = BGP_GR_FAILURE; | |
2950 | ||
2951 | if (old_peer_state == new_peer_state) { | |
36235319 QY |
2952 | /* Nothing to do over here as the present and old state is the |
2953 | * same */ | |
794b37d5 | 2954 | return BGP_GR_NO_OPERATION; |
2955 | } | |
36235319 QY |
2956 | if ((old_peer_state == PEER_INVALID) |
2957 | || (new_peer_state == PEER_INVALID)) { | |
2958 | /* something bad happend , print error message */ | |
794b37d5 | 2959 | return BGP_ERR_GR_INVALID_CMD; |
2960 | } | |
2961 | ||
2962 | bgp_gr_global_mode = bgp_global_gr_mode_get(peer->bgp); | |
2963 | ||
36235319 QY |
2964 | if ((old_peer_state == PEER_GLOBAL_INHERIT) |
2965 | && (new_peer_state != PEER_GLOBAL_INHERIT)) { | |
794b37d5 | 2966 | |
2967 | /* fetch the Mode running in the Global state machine | |
2968 | *from the bgp structure into a variable called | |
2969 | *bgp_gr_global_mode | |
2970 | */ | |
2971 | ||
2972 | /* Here we are checking if the | |
2973 | *1. peer_new_state == global_mode == helper_mode | |
2974 | *2. peer_new_state == global_mode == GR_mode | |
2975 | *3. peer_new_state == global_mode == disabled_mode | |
2976 | */ | |
2977 | ||
2978 | BGP_PEER_GR_GLOBAL_INHERIT_UNSET(peer); | |
2979 | ||
2980 | if (new_peer_state == bgp_gr_global_mode) { | |
36235319 QY |
2981 | /*This is incremental updates i.e no tear down |
2982 | *of the existing session | |
2983 | *as the peer is already working in the same mode. | |
2984 | */ | |
794b37d5 | 2985 | ret = BGP_GR_SUCCESS; |
2986 | } else { | |
2987 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2988 | zlog_debug( | |
2ba1fe69 | 2989 | "[BGP_GR] Peer state changed from :%s ", |
2990 | print_peer_gr_mode(old_peer_state)); | |
794b37d5 | 2991 | |
2992 | bgp_peer_move_to_gr_mode(peer, new_peer_state); | |
2993 | ||
2994 | ret = BGP_GR_SUCCESS; | |
2995 | } | |
2996 | } | |
2997 | /* In the case below peer is going into Global inherit mode i.e. | |
2998 | * the peer would work as the mode configured at the global level | |
2999 | */ | |
36235319 QY |
3000 | else if ((new_peer_state == PEER_GLOBAL_INHERIT) |
3001 | && (old_peer_state != PEER_GLOBAL_INHERIT)) { | |
794b37d5 | 3002 | /* Here in this case it would be destructive |
3003 | * in all the cases except one case when, | |
3004 | * Global GR is configured Disabled | |
3005 | * and present_peer_state is not disable | |
3006 | */ | |
3007 | ||
3008 | BGP_PEER_GR_GLOBAL_INHERIT_SET(peer); | |
3009 | ||
3010 | if (old_peer_state == bgp_gr_global_mode) { | |
3011 | ||
3012 | /* This is incremental updates | |
3013 | *i.e no tear down of the existing session | |
3014 | *as the peer is already working in the same mode. | |
3015 | */ | |
3016 | ret = BGP_GR_SUCCESS; | |
3017 | } else { | |
3018 | /* Destructive always */ | |
3019 | /* Tear down the old session | |
3020 | * and send the new capability | |
3021 | * as per the bgp_gr_global_mode | |
3022 | */ | |
3023 | ||
3024 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
36235319 QY |
3025 | zlog_debug( |
3026 | "[BGP_GR] Peer state changed from :%s", | |
2ba1fe69 | 3027 | print_peer_gr_mode(old_peer_state)); |
794b37d5 | 3028 | |
3029 | bgp_peer_move_to_gr_mode(peer, bgp_gr_global_mode); | |
3030 | ||
3031 | ret = BGP_GR_SUCCESS; | |
3032 | } | |
3033 | } else { | |
3034 | /* | |
3035 | *This else case, it include all the cases except --> | |
3036 | *(new_peer_state != Peer_Global) && | |
3037 | *( old_peer_state != Peer_Global ) | |
3038 | */ | |
3039 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2ba1fe69 | 3040 | zlog_debug("[BGP_GR] Peer state changed from :%s", |
36235319 | 3041 | print_peer_gr_mode(old_peer_state)); |
794b37d5 | 3042 | |
3043 | bgp_peer_move_to_gr_mode(peer, new_peer_state); | |
3044 | ||
3045 | ret = BGP_GR_SUCCESS; | |
3046 | } | |
3047 | ||
3048 | return ret; | |
3049 | } | |
3050 | ||
3051 | inline void bgp_peer_move_to_gr_mode(struct peer *peer, int new_state) | |
3052 | ||
3053 | { | |
3054 | int bgp_global_gr_mode = bgp_global_gr_mode_get(peer->bgp); | |
3055 | ||
3056 | switch (new_state) { | |
794b37d5 | 3057 | case PEER_HELPER: |
3058 | BGP_PEER_GR_HELPER_ENABLE(peer); | |
3059 | break; | |
794b37d5 | 3060 | case PEER_GR: |
3061 | BGP_PEER_GR_ENABLE(peer); | |
3062 | break; | |
794b37d5 | 3063 | case PEER_DISABLE: |
3064 | BGP_PEER_GR_DISABLE(peer); | |
3065 | break; | |
794b37d5 | 3066 | case PEER_GLOBAL_INHERIT: |
3067 | BGP_PEER_GR_GLOBAL_INHERIT_SET(peer); | |
3068 | ||
3069 | if (bgp_global_gr_mode == GLOBAL_HELPER) { | |
3070 | BGP_PEER_GR_HELPER_ENABLE(peer); | |
36235319 | 3071 | } else if (bgp_global_gr_mode == GLOBAL_GR) { |
794b37d5 | 3072 | BGP_PEER_GR_ENABLE(peer); |
3073 | } else if (bgp_global_gr_mode == GLOBAL_DISABLE) { | |
3074 | BGP_PEER_GR_DISABLE(peer); | |
3075 | } else { | |
2ba1fe69 | 3076 | zlog_err( |
36235319 | 3077 | "[BGP_GR] Default switch inherit mode ::: SOMETHING IS WRONG !!!"); |
794b37d5 | 3078 | } |
3079 | break; | |
3080 | default: | |
36235319 QY |
3081 | zlog_err( |
3082 | "[BGP_GR] Default switch mode ::: SOMETHING IS WRONG !!!"); | |
794b37d5 | 3083 | break; |
3084 | } | |
3085 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2ba1fe69 | 3086 | zlog_debug("[BGP_GR] Peer state changed --to--> : %d : !", |
36235319 | 3087 | new_state); |
794b37d5 | 3088 | } |
3089 | ||
3090 | void bgp_peer_gr_flags_update(struct peer *peer) | |
3091 | { | |
3092 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
36235319 | 3093 | zlog_debug("%s [BGP_GR] called !", __func__); |
794b37d5 | 3094 | if (CHECK_FLAG(peer->peer_gr_new_status_flag, |
36235319 QY |
3095 | PEER_GRACEFUL_RESTART_NEW_STATE_HELPER)) |
3096 | SET_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART_HELPER); | |
794b37d5 | 3097 | else |
36235319 | 3098 | UNSET_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART_HELPER); |
794b37d5 | 3099 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
3100 | zlog_debug( | |
2ba1fe69 | 3101 | "[BGP_GR] Peer %s Flag PEER_FLAG_GRACEFUL_RESTART_HELPER : %s : !", |
794b37d5 | 3102 | peer->host, |
2986cac2 | 3103 | (CHECK_FLAG(peer->flags, |
36235319 QY |
3104 | PEER_FLAG_GRACEFUL_RESTART_HELPER) |
3105 | ? "Set" | |
3106 | : "UnSet")); | |
794b37d5 | 3107 | if (CHECK_FLAG(peer->peer_gr_new_status_flag, |
36235319 QY |
3108 | PEER_GRACEFUL_RESTART_NEW_STATE_RESTART)) |
3109 | SET_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART); | |
794b37d5 | 3110 | else |
36235319 | 3111 | UNSET_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART); |
794b37d5 | 3112 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
3113 | zlog_debug( | |
2ba1fe69 | 3114 | "[BGP_GR] Peer %s Flag PEER_FLAG_GRACEFUL_RESTART : %s : !", |
794b37d5 | 3115 | peer->host, |
36235319 QY |
3116 | (CHECK_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART) |
3117 | ? "Set" | |
3118 | : "UnSet")); | |
794b37d5 | 3119 | if (CHECK_FLAG(peer->peer_gr_new_status_flag, |
36235319 | 3120 | PEER_GRACEFUL_RESTART_NEW_STATE_INHERIT)) |
2986cac2 | 3121 | SET_FLAG(peer->flags, |
36235319 | 3122 | PEER_FLAG_GRACEFUL_RESTART_GLOBAL_INHERIT); |
794b37d5 | 3123 | else |
2986cac2 | 3124 | UNSET_FLAG(peer->flags, |
36235319 | 3125 | PEER_FLAG_GRACEFUL_RESTART_GLOBAL_INHERIT); |
794b37d5 | 3126 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
3127 | zlog_debug( | |
36235319 | 3128 | "[BGP_GR] Peer %s Flag PEER_FLAG_GRACEFUL_RESTART_GLOBAL_INHERIT : %s : !", |
794b37d5 | 3129 | peer->host, |
2986cac2 | 3130 | (CHECK_FLAG(peer->flags, |
36235319 QY |
3131 | PEER_FLAG_GRACEFUL_RESTART_GLOBAL_INHERIT) |
3132 | ? "Set" | |
3133 | : "UnSet")); | |
d7b3cda6 | 3134 | |
36235319 QY |
3135 | if (!CHECK_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART) |
3136 | && !CHECK_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART_HELPER)) { | |
3137 | zlog_debug("[BGP_GR] Peer %s UNSET PEER_STATUS_NSF_MODE!", | |
3138 | peer->host); | |
d7b3cda6 | 3139 | |
3140 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
3141 | ||
36235319 | 3142 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { |
d7b3cda6 | 3143 | |
3144 | peer_nsf_stop(peer); | |
3145 | zlog_debug( | |
2ba1fe69 | 3146 | "[BGP_GR] Peer %s UNSET PEER_STATUS_NSF_WAIT!", |
d7b3cda6 | 3147 | peer->host); |
3148 | } | |
3149 | } | |
794b37d5 | 3150 | } |