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acddc0ed | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
d62a17ae | 2 | /* BGP-4 Finite State Machine |
896014f4 DL |
3 | * From RFC1771 [A Border Gateway Protocol 4 (BGP-4)] |
4 | * Copyright (C) 1996, 97, 98 Kunihiro Ishiguro | |
896014f4 | 5 | */ |
718e3744 | 6 | |
7 | #include <zebra.h> | |
8 | ||
9 | #include "linklist.h" | |
10 | #include "prefix.h" | |
718e3744 | 11 | #include "sockunion.h" |
24a58196 | 12 | #include "frrevent.h" |
718e3744 | 13 | #include "log.h" |
14 | #include "stream.h" | |
74ffbfe6 | 15 | #include "ringbuf.h" |
718e3744 | 16 | #include "memory.h" |
17 | #include "plist.h" | |
f188f2c4 | 18 | #include "workqueue.h" |
3f9c7369 | 19 | #include "queue.h" |
039f3a34 | 20 | #include "filter.h" |
4dcadbef | 21 | #include "command.h" |
02705213 | 22 | #include "lib_errors.h" |
8c48b3b6 | 23 | #include "zclient.h" |
856ca177 | 24 | #include "lib/json.h" |
718e3744 | 25 | #include "bgpd/bgpd.h" |
26 | #include "bgpd/bgp_attr.h" | |
27 | #include "bgpd/bgp_debug.h" | |
14454c9f | 28 | #include "bgpd/bgp_errors.h" |
718e3744 | 29 | #include "bgpd/bgp_fsm.h" |
30 | #include "bgpd/bgp_packet.h" | |
31 | #include "bgpd/bgp_network.h" | |
32 | #include "bgpd/bgp_route.h" | |
33 | #include "bgpd/bgp_dump.h" | |
34 | #include "bgpd/bgp_open.h" | |
f188f2c4 | 35 | #include "bgpd/bgp_advertise.h" |
1479ed2f | 36 | #include "bgpd/bgp_community.h" |
3f9c7369 | 37 | #include "bgpd/bgp_updgrp.h" |
ffd0c037 | 38 | #include "bgpd/bgp_nht.h" |
c43ed2e4 | 39 | #include "bgpd/bgp_bfd.h" |
4a1ab8e4 | 40 | #include "bgpd/bgp_memory.h" |
03014d48 | 41 | #include "bgpd/bgp_keepalives.h" |
56257a44 | 42 | #include "bgpd/bgp_io.h" |
c42eab4b | 43 | #include "bgpd/bgp_zebra.h" |
3742de8d | 44 | #include "bgpd/bgp_vty.h" |
6b0655a2 | 45 | |
8451921b DL |
46 | DEFINE_HOOK(peer_backward_transition, (struct peer * peer), (peer)); |
47 | DEFINE_HOOK(peer_status_changed, (struct peer * peer), (peer)); | |
3742de8d | 48 | |
4da144f3 DS |
49 | enum bgp_fsm_state_progress { |
50 | BGP_FSM_FAILURE_AND_DELETE = -2, | |
51 | BGP_FSM_FAILURE = -1, | |
52 | BGP_FSM_SUCCESS = 0, | |
53 | BGP_FSM_SUCCESS_STATE_TRANSFER = 1, | |
54 | }; | |
55 | ||
6403814c DS |
56 | /* Definition of display strings corresponding to FSM events. This should be |
57 | * kept consistent with the events defined in bgpd.h | |
58 | */ | |
2b64873d | 59 | static const char *const bgp_event_str[] = { |
d62a17ae | 60 | NULL, |
61 | "BGP_Start", | |
62 | "BGP_Stop", | |
63 | "TCP_connection_open", | |
6c537a18 | 64 | "TCP_connection_open_w_delay", |
d62a17ae | 65 | "TCP_connection_closed", |
66 | "TCP_connection_open_failed", | |
67 | "TCP_fatal_error", | |
68 | "ConnectRetry_timer_expired", | |
69 | "Hold_Timer_expired", | |
70 | "KeepAlive_timer_expired", | |
6c537a18 | 71 | "DelayOpen_timer_expired", |
d62a17ae | 72 | "Receive_OPEN_message", |
73 | "Receive_KEEPALIVE_message", | |
74 | "Receive_UPDATE_message", | |
75 | "Receive_NOTIFICATION_message", | |
76 | "Clearing_Completed", | |
6403814c DS |
77 | }; |
78 | ||
718e3744 | 79 | /* BGP FSM (finite state machine) has three types of functions. Type |
80 | one is thread functions. Type two is event functions. Type three | |
81 | is FSM functions. Timer functions are set by bgp_timer_set | |
82 | function. */ | |
83 | ||
84 | /* BGP event function. */ | |
e6685141 | 85 | void bgp_event(struct event *event); |
718e3744 | 86 | |
87 | /* BGP thread functions. */ | |
e6685141 DS |
88 | static void bgp_start_timer(struct event *event); |
89 | static void bgp_connect_timer(struct event *event); | |
90 | static void bgp_holdtime_timer(struct event *event); | |
91 | static void bgp_delayopen_timer(struct event *event); | |
718e3744 | 92 | |
93 | /* BGP FSM functions. */ | |
4da144f3 | 94 | static enum bgp_fsm_state_progress bgp_start(struct peer *); |
718e3744 | 95 | |
e2d3a909 | 96 | /* Register peer with NHT */ |
996319e6 | 97 | int bgp_peer_reg_with_nht(struct peer *peer) |
e2d3a909 | 98 | { |
99 | int connected = 0; | |
100 | ||
c8d6f0d6 | 101 | if (peer->sort == BGP_PEER_EBGP && peer->ttl == BGP_DEFAULT_TTL |
e2d3a909 | 102 | && !CHECK_FLAG(peer->flags, PEER_FLAG_DISABLE_CONNECTED_CHECK) |
892fedb6 | 103 | && !CHECK_FLAG(peer->bgp->flags, BGP_FLAG_DISABLE_NH_CONNECTED_CHK)) |
e2d3a909 | 104 | connected = 1; |
105 | ||
654a5978 PG |
106 | return bgp_find_or_add_nexthop( |
107 | peer->bgp, peer->bgp, family2afi(peer->su.sa.sa_family), | |
108 | SAFI_UNICAST, NULL, peer, connected, NULL); | |
e2d3a909 | 109 | } |
110 | ||
d62a17ae | 111 | static void peer_xfer_stats(struct peer *peer_dst, struct peer *peer_src) |
1ff9a340 | 112 | { |
d62a17ae | 113 | /* Copy stats over. These are only the pre-established state stats */ |
114 | peer_dst->open_in += peer_src->open_in; | |
115 | peer_dst->open_out += peer_src->open_out; | |
116 | peer_dst->keepalive_in += peer_src->keepalive_in; | |
117 | peer_dst->keepalive_out += peer_src->keepalive_out; | |
118 | peer_dst->notify_in += peer_src->notify_in; | |
119 | peer_dst->notify_out += peer_src->notify_out; | |
120 | peer_dst->dynamic_cap_in += peer_src->dynamic_cap_in; | |
121 | peer_dst->dynamic_cap_out += peer_src->dynamic_cap_out; | |
1ff9a340 DS |
122 | } |
123 | ||
d62a17ae | 124 | static struct peer *peer_xfer_conn(struct peer *from_peer) |
1ff9a340 | 125 | { |
d62a17ae | 126 | struct peer *peer; |
127 | afi_t afi; | |
128 | safi_t safi; | |
129 | int fd; | |
8398b5d5 | 130 | enum bgp_fsm_status status, pstatus; |
d1060698 | 131 | enum bgp_fsm_events last_evt, last_maj_evt; |
d62a17ae | 132 | |
133 | assert(from_peer != NULL); | |
134 | ||
135 | peer = from_peer->doppelganger; | |
136 | ||
137 | if (!peer || !CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE)) | |
138 | return from_peer; | |
139 | ||
9bf904cc DS |
140 | /* |
141 | * Let's check that we are not going to loose known configuration | |
142 | * state based upon doppelganger rules. | |
143 | */ | |
144 | FOREACH_AFI_SAFI (afi, safi) { | |
145 | if (from_peer->afc[afi][safi] != peer->afc[afi][safi]) { | |
146 | flog_err( | |
147 | EC_BGP_DOPPELGANGER_CONFIG, | |
148 | "from_peer->afc[%d][%d] is not the same as what we are overwriting", | |
149 | afi, safi); | |
150 | return NULL; | |
151 | } | |
152 | } | |
153 | ||
d62a17ae | 154 | if (bgp_debug_neighbor_events(peer)) |
155 | zlog_debug("%s: peer transfer %p fd %d -> %p fd %d)", | |
156 | from_peer->host, from_peer, from_peer->fd, peer, | |
157 | peer->fd); | |
158 | ||
424ab01d QY |
159 | bgp_writes_off(peer); |
160 | bgp_reads_off(peer); | |
161 | bgp_writes_off(from_peer); | |
162 | bgp_reads_off(from_peer); | |
d62a17ae | 163 | |
74e00a55 S |
164 | /* |
165 | * Before exchanging FD remove doppelganger from | |
166 | * keepalive peer hash. It could be possible conf peer | |
167 | * fd is set to -1. If blocked on lock then keepalive | |
168 | * thread can access peer pointer with fd -1. | |
169 | */ | |
170 | bgp_keepalives_off(from_peer); | |
171 | ||
e16d030c DS |
172 | EVENT_OFF(peer->t_routeadv); |
173 | EVENT_OFF(peer->t_connect); | |
174 | EVENT_OFF(peer->t_delayopen); | |
175 | EVENT_OFF(peer->t_connect_check_r); | |
176 | EVENT_OFF(peer->t_connect_check_w); | |
177 | EVENT_OFF(from_peer->t_routeadv); | |
178 | EVENT_OFF(from_peer->t_connect); | |
179 | EVENT_OFF(from_peer->t_delayopen); | |
180 | EVENT_OFF(from_peer->t_connect_check_r); | |
181 | EVENT_OFF(from_peer->t_connect_check_w); | |
182 | EVENT_OFF(from_peer->t_process_packet); | |
d3ecc69e | 183 | |
becedef6 QY |
184 | /* |
185 | * At this point in time, it is possible that there are packets pending | |
186 | * on various buffers. Those need to be transferred or dropped, | |
187 | * otherwise we'll get spurious failures during session establishment. | |
188 | */ | |
cb1991af | 189 | frr_with_mutex (&peer->io_mtx, &from_peer->io_mtx) { |
424ab01d QY |
190 | fd = peer->fd; |
191 | peer->fd = from_peer->fd; | |
192 | from_peer->fd = fd; | |
193 | ||
194 | stream_fifo_clean(peer->ibuf); | |
d3ecc69e | 195 | stream_fifo_clean(peer->obuf); |
d3ecc69e | 196 | |
becedef6 QY |
197 | /* |
198 | * this should never happen, since bgp_process_packet() is the | |
199 | * only task that sets and unsets the current packet and it | |
200 | * runs in our pthread. | |
201 | */ | |
424ab01d | 202 | if (peer->curr) { |
af4c2728 | 203 | flog_err( |
e50f7cfd | 204 | EC_BGP_PKT_PROCESS, |
424ab01d QY |
205 | "[%s] Dropping pending packet on connection transfer:", |
206 | peer->host); | |
584470fb DL |
207 | /* there used to be a bgp_packet_dump call here, but |
208 | * that's extremely confusing since there's no way to | |
209 | * identify the packet in MRT dumps or BMP as dropped | |
210 | * due to connection transfer. | |
211 | */ | |
424ab01d QY |
212 | stream_free(peer->curr); |
213 | peer->curr = NULL; | |
214 | } | |
215 | ||
216 | // copy each packet from old peer's output queue to new peer | |
727c4f87 QY |
217 | while (from_peer->obuf->head) |
218 | stream_fifo_push(peer->obuf, | |
219 | stream_fifo_pop(from_peer->obuf)); | |
424ab01d QY |
220 | |
221 | // copy each packet from old peer's input queue to new peer | |
222 | while (from_peer->ibuf->head) | |
223 | stream_fifo_push(peer->ibuf, | |
224 | stream_fifo_pop(from_peer->ibuf)); | |
7db44ec8 | 225 | |
74ffbfe6 QY |
226 | ringbuf_wipe(peer->ibuf_work); |
227 | ringbuf_copy(peer->ibuf_work, from_peer->ibuf_work, | |
228 | ringbuf_remain(from_peer->ibuf_work)); | |
d3ecc69e | 229 | } |
d62a17ae | 230 | |
231 | peer->as = from_peer->as; | |
232 | peer->v_holdtime = from_peer->v_holdtime; | |
233 | peer->v_keepalive = from_peer->v_keepalive; | |
d62a17ae | 234 | peer->v_routeadv = from_peer->v_routeadv; |
6c537a18 | 235 | peer->v_delayopen = from_peer->v_delayopen; |
d62a17ae | 236 | peer->v_gr_restart = from_peer->v_gr_restart; |
237 | peer->cap = from_peer->cap; | |
8f2d6021 | 238 | peer->remote_role = from_peer->remote_role; |
d62a17ae | 239 | status = peer->status; |
240 | pstatus = peer->ostatus; | |
241 | last_evt = peer->last_event; | |
242 | last_maj_evt = peer->last_major_event; | |
243 | peer->status = from_peer->status; | |
244 | peer->ostatus = from_peer->ostatus; | |
245 | peer->last_event = from_peer->last_event; | |
246 | peer->last_major_event = from_peer->last_major_event; | |
247 | from_peer->status = status; | |
248 | from_peer->ostatus = pstatus; | |
249 | from_peer->last_event = last_evt; | |
250 | from_peer->last_major_event = last_maj_evt; | |
251 | peer->remote_id = from_peer->remote_id; | |
3577f1c5 | 252 | peer->last_reset = from_peer->last_reset; |
0db06e37 | 253 | peer->max_packet_size = from_peer->max_packet_size; |
d62a17ae | 254 | |
36235319 QY |
255 | BGP_GR_ROUTER_DETECT_AND_SEND_CAPABILITY_TO_ZEBRA(peer->bgp, |
256 | peer->bgp->peer); | |
8c48b3b6 | 257 | |
d7b3cda6 | 258 | if (bgp_peer_gr_mode_get(peer) == PEER_DISABLE) { |
259 | ||
260 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
261 | ||
36235319 | 262 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { |
d7b3cda6 | 263 | peer_nsf_stop(peer); |
264 | } | |
265 | } | |
266 | ||
d188b08f DA |
267 | if (peer->hostname) { |
268 | XFREE(MTYPE_BGP_PEER_HOST, peer->hostname); | |
269 | peer->hostname = NULL; | |
270 | } | |
d62a17ae | 271 | if (from_peer->hostname != NULL) { |
d62a17ae | 272 | peer->hostname = from_peer->hostname; |
273 | from_peer->hostname = NULL; | |
274 | } | |
275 | ||
d188b08f DA |
276 | if (peer->domainname) { |
277 | XFREE(MTYPE_BGP_PEER_HOST, peer->domainname); | |
278 | peer->domainname = NULL; | |
279 | } | |
d62a17ae | 280 | if (from_peer->domainname != NULL) { |
d62a17ae | 281 | peer->domainname = from_peer->domainname; |
282 | from_peer->domainname = NULL; | |
283 | } | |
284 | ||
234f6fd4 DA |
285 | if (peer->soft_version) { |
286 | XFREE(MTYPE_BGP_SOFT_VERSION, peer->soft_version); | |
287 | peer->soft_version = NULL; | |
288 | } | |
289 | if (from_peer->soft_version) { | |
290 | peer->soft_version = from_peer->soft_version; | |
291 | from_peer->soft_version = NULL; | |
292 | } | |
293 | ||
05c7a1cc | 294 | FOREACH_AFI_SAFI (afi, safi) { |
05c7a1cc QY |
295 | peer->af_sflags[afi][safi] = from_peer->af_sflags[afi][safi]; |
296 | peer->af_cap[afi][safi] = from_peer->af_cap[afi][safi]; | |
297 | peer->afc_nego[afi][safi] = from_peer->afc_nego[afi][safi]; | |
298 | peer->afc_adv[afi][safi] = from_peer->afc_adv[afi][safi]; | |
299 | peer->afc_recv[afi][safi] = from_peer->afc_recv[afi][safi]; | |
300 | peer->orf_plist[afi][safi] = from_peer->orf_plist[afi][safi]; | |
1479ed2f | 301 | peer->llgr[afi][safi] = from_peer->llgr[afi][safi]; |
05c7a1cc | 302 | } |
d62a17ae | 303 | |
304 | if (bgp_getsockname(peer) < 0) { | |
af4c2728 | 305 | flog_err( |
450971aa | 306 | EC_LIB_SOCKET, |
d62a17ae | 307 | "%%bgp_getsockname() failed for %s peer %s fd %d (from_peer fd %d)", |
308 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER) | |
309 | ? "accept" | |
310 | : ""), | |
311 | peer->host, peer->fd, from_peer->fd); | |
6c4d8732 SP |
312 | BGP_EVENT_ADD(peer, BGP_Stop); |
313 | BGP_EVENT_ADD(from_peer, BGP_Stop); | |
d62a17ae | 314 | return NULL; |
315 | } | |
316 | if (from_peer->status > Active) { | |
317 | if (bgp_getsockname(from_peer) < 0) { | |
af4c2728 | 318 | flog_err( |
450971aa | 319 | EC_LIB_SOCKET, |
d62a17ae | 320 | "%%bgp_getsockname() failed for %s from_peer %s fd %d (peer fd %d)", |
14454c9f | 321 | |
d62a17ae | 322 | (CHECK_FLAG(from_peer->sflags, |
323 | PEER_STATUS_ACCEPT_PEER) | |
324 | ? "accept" | |
325 | : ""), | |
326 | from_peer->host, from_peer->fd, peer->fd); | |
327 | bgp_stop(from_peer); | |
328 | from_peer = NULL; | |
329 | } | |
330 | } | |
331 | ||
0112e9e0 QY |
332 | |
333 | // Note: peer_xfer_stats() must be called with I/O turned OFF | |
334 | if (from_peer) | |
335 | peer_xfer_stats(peer, from_peer); | |
336 | ||
e2d3a909 | 337 | /* Register peer for NHT. This is to allow RAs to be enabled when |
338 | * needed, even on a passive connection. | |
339 | */ | |
340 | bgp_peer_reg_with_nht(peer); | |
996319e6 DS |
341 | if (from_peer) |
342 | bgp_replace_nexthop_by_peer(from_peer, peer); | |
e2d3a909 | 343 | |
424ab01d QY |
344 | bgp_reads_on(peer); |
345 | bgp_writes_on(peer); | |
907a2395 DS |
346 | event_add_event(bm->master, bgp_process_packet, peer, 0, |
347 | &peer->t_process_packet); | |
d62a17ae | 348 | |
d62a17ae | 349 | return (peer); |
1ff9a340 DS |
350 | } |
351 | ||
718e3744 | 352 | /* Hook function called after bgp event is occered. And vty's |
353 | neighbor command invoke this function after making neighbor | |
354 | structure. */ | |
d62a17ae | 355 | void bgp_timer_set(struct peer *peer) |
718e3744 | 356 | { |
1479ed2f DA |
357 | afi_t afi; |
358 | safi_t safi; | |
359 | ||
d62a17ae | 360 | switch (peer->status) { |
361 | case Idle: | |
362 | /* First entry point of peer's finite state machine. In Idle | |
363 | status start timer is on unless peer is shutdown or peer is | |
364 | inactive. All other timer must be turned off */ | |
f62abc7d | 365 | if (BGP_PEER_START_SUPPRESSED(peer) || !peer_active(peer) |
2c1eba8e | 366 | || peer->bgp->vrf_id == VRF_UNKNOWN) { |
e16d030c | 367 | EVENT_OFF(peer->t_start); |
d62a17ae | 368 | } else { |
369 | BGP_TIMER_ON(peer->t_start, bgp_start_timer, | |
370 | peer->v_start); | |
371 | } | |
e16d030c DS |
372 | EVENT_OFF(peer->t_connect); |
373 | EVENT_OFF(peer->t_holdtime); | |
b72b6f4f | 374 | bgp_keepalives_off(peer); |
e16d030c DS |
375 | EVENT_OFF(peer->t_routeadv); |
376 | EVENT_OFF(peer->t_delayopen); | |
d62a17ae | 377 | break; |
378 | ||
379 | case Connect: | |
380 | /* After start timer is expired, the peer moves to Connect | |
381 | status. Make sure start timer is off and connect timer is | |
382 | on. */ | |
e16d030c | 383 | EVENT_OFF(peer->t_start); |
6c537a18 DS |
384 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER_DELAYOPEN)) |
385 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
386 | (peer->v_delayopen + peer->v_connect)); | |
387 | else | |
388 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
389 | peer->v_connect); | |
390 | ||
e16d030c | 391 | EVENT_OFF(peer->t_holdtime); |
b72b6f4f | 392 | bgp_keepalives_off(peer); |
e16d030c | 393 | EVENT_OFF(peer->t_routeadv); |
d62a17ae | 394 | break; |
395 | ||
396 | case Active: | |
397 | /* Active is waiting connection from remote peer. And if | |
398 | connect timer is expired, change status to Connect. */ | |
e16d030c | 399 | EVENT_OFF(peer->t_start); |
d62a17ae | 400 | /* If peer is passive mode, do not set connect timer. */ |
401 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE) | |
402 | || CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
e16d030c | 403 | EVENT_OFF(peer->t_connect); |
d62a17ae | 404 | } else { |
6c537a18 DS |
405 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER_DELAYOPEN)) |
406 | BGP_TIMER_ON( | |
407 | peer->t_connect, bgp_connect_timer, | |
408 | (peer->v_delayopen + peer->v_connect)); | |
409 | else | |
410 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
411 | peer->v_connect); | |
d62a17ae | 412 | } |
e16d030c | 413 | EVENT_OFF(peer->t_holdtime); |
b72b6f4f | 414 | bgp_keepalives_off(peer); |
e16d030c | 415 | EVENT_OFF(peer->t_routeadv); |
d62a17ae | 416 | break; |
417 | ||
418 | case OpenSent: | |
419 | /* OpenSent status. */ | |
e16d030c DS |
420 | EVENT_OFF(peer->t_start); |
421 | EVENT_OFF(peer->t_connect); | |
d62a17ae | 422 | if (peer->v_holdtime != 0) { |
423 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
424 | peer->v_holdtime); | |
425 | } else { | |
e16d030c | 426 | EVENT_OFF(peer->t_holdtime); |
d62a17ae | 427 | } |
b72b6f4f | 428 | bgp_keepalives_off(peer); |
e16d030c DS |
429 | EVENT_OFF(peer->t_routeadv); |
430 | EVENT_OFF(peer->t_delayopen); | |
d62a17ae | 431 | break; |
432 | ||
433 | case OpenConfirm: | |
434 | /* OpenConfirm status. */ | |
e16d030c DS |
435 | EVENT_OFF(peer->t_start); |
436 | EVENT_OFF(peer->t_connect); | |
d62a17ae | 437 | |
aa554d4b DS |
438 | /* |
439 | * If the negotiated Hold Time value is zero, then the Hold Time | |
440 | * timer and KeepAlive timers are not started. | |
441 | * Additionally if a different hold timer has been negotiated | |
442 | * than we must stop then start the timer again | |
443 | */ | |
e16d030c | 444 | EVENT_OFF(peer->t_holdtime); |
aa554d4b | 445 | if (peer->v_holdtime == 0) |
b72b6f4f | 446 | bgp_keepalives_off(peer); |
aa554d4b | 447 | else { |
d62a17ae | 448 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, |
449 | peer->v_holdtime); | |
b72b6f4f | 450 | bgp_keepalives_on(peer); |
d62a17ae | 451 | } |
e16d030c DS |
452 | EVENT_OFF(peer->t_routeadv); |
453 | EVENT_OFF(peer->t_delayopen); | |
d62a17ae | 454 | break; |
455 | ||
456 | case Established: | |
457 | /* In Established status start and connect timer is turned | |
458 | off. */ | |
e16d030c DS |
459 | EVENT_OFF(peer->t_start); |
460 | EVENT_OFF(peer->t_connect); | |
461 | EVENT_OFF(peer->t_delayopen); | |
d62a17ae | 462 | |
aa554d4b DS |
463 | /* |
464 | * Same as OpenConfirm, if holdtime is zero then both holdtime | |
465 | * and keepalive must be turned off. | |
466 | * Additionally if a different hold timer has been negotiated | |
467 | * then we must stop then start the timer again | |
468 | */ | |
e16d030c | 469 | EVENT_OFF(peer->t_holdtime); |
aa554d4b | 470 | if (peer->v_holdtime == 0) |
bea01226 | 471 | bgp_keepalives_off(peer); |
aa554d4b | 472 | else { |
d62a17ae | 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: | |
e16d030c DS |
479 | EVENT_OFF(peer->t_gr_restart); |
480 | EVENT_OFF(peer->t_gr_stale); | |
1479ed2f DA |
481 | |
482 | FOREACH_AFI_SAFI (afi, safi) | |
e16d030c | 483 | EVENT_OFF(peer->t_llgr_stale[afi][safi]); |
1479ed2f | 484 | |
e16d030c DS |
485 | EVENT_OFF(peer->t_pmax_restart); |
486 | EVENT_OFF(peer->t_refresh_stalepath); | |
d62a17ae | 487 | /* fallthru */ |
488 | case Clearing: | |
e16d030c DS |
489 | EVENT_OFF(peer->t_start); |
490 | EVENT_OFF(peer->t_connect); | |
491 | EVENT_OFF(peer->t_holdtime); | |
b72b6f4f | 492 | bgp_keepalives_off(peer); |
e16d030c DS |
493 | EVENT_OFF(peer->t_routeadv); |
494 | EVENT_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. */ | |
e6685141 | 505 | static void bgp_start_timer(struct event *thread) |
718e3744 | 506 | { |
d62a17ae | 507 | struct peer *peer; |
718e3744 | 508 | |
e16d030c | 509 | peer = EVENT_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 | |
e16d030c | 514 | EVENT_VAL(thread) = BGP_Start; |
d62a17ae | 515 | bgp_event(thread); /* bgp_event unlocks peer */ |
718e3744 | 516 | } |
517 | ||
518 | /* BGP connect retry timer. */ | |
e6685141 | 519 | static void bgp_connect_timer(struct event *thread) |
718e3744 | 520 | { |
d62a17ae | 521 | struct peer *peer; |
d62a17ae | 522 | |
e16d030c | 523 | peer = EVENT_ARG(thread); |
424ab01d | 524 | |
6c537a18 | 525 | /* stop the DelayOpenTimer if it is running */ |
e16d030c | 526 | EVENT_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 { |
e16d030c | 537 | EVENT_VAL(thread) = ConnectRetry_timer_expired; |
d62a17ae | 538 | bgp_event(thread); /* bgp_event unlocks peer */ |
d62a17ae | 539 | } |
718e3744 | 540 | } |
541 | ||
542 | /* BGP holdtime timer. */ | |
e6685141 | 543 | static void bgp_holdtime_timer(struct event *thread) |
718e3744 | 544 | { |
d0874d19 | 545 | atomic_size_t inq_count; |
d62a17ae | 546 | struct peer *peer; |
718e3744 | 547 | |
e16d030c | 548 | peer = EVENT_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 | ||
e16d030c | 570 | EVENT_VAL(thread) = Hold_Timer_expired; |
d62a17ae | 571 | bgp_event(thread); /* bgp_event unlocks peer */ |
718e3744 | 572 | } |
573 | ||
e6685141 | 574 | void bgp_routeadv_timer(struct event *thread) |
718e3744 | 575 | { |
d62a17ae | 576 | struct peer *peer; |
718e3744 | 577 | |
e16d030c | 578 | peer = EVENT_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 | |
907a2395 DS |
586 | event_add_timer_msec(bm->master, bgp_generate_updgrp_packets, peer, 0, |
587 | &peer->t_generate_updgrp_packets); | |
424ab01d | 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 */ |
e6685141 | 595 | void bgp_delayopen_timer(struct event *thread) |
6c537a18 DS |
596 | { |
597 | struct peer *peer; | |
598 | ||
e16d030c | 599 | peer = EVENT_ARG(thread); |
6c537a18 DS |
600 | |
601 | if (bgp_debug_neighbor_events(peer)) | |
602 | zlog_debug("%s [FSM] Timer (DelayOpentimer expire)", | |
603 | peer->host); | |
604 | ||
e16d030c | 605 | EVENT_VAL(thread) = DelayOpen_timer_expired; |
6c537a18 | 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); | |
e16d030c | 658 | EVENT_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 | ||
e6685141 | 671 | static void bgp_llgr_stale_timer_expire(struct event *thread) |
1479ed2f DA |
672 | { |
673 | struct peer_af *paf; | |
674 | struct peer *peer; | |
675 | afi_t afi; | |
676 | safi_t safi; | |
677 | ||
e16d030c | 678 | paf = EVENT_ARG(thread); |
1479ed2f DA |
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 | ||
e6685141 | 773 | static void bgp_graceful_restart_timer_expire(struct event *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 | ||
e16d030c | 781 | peer = EVENT_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 | ||
907a2395 DS |
823 | event_add_timer(bm->master, bgp_llgr_stale_timer_expire, |
824 | paf, peer->llgr[afi][safi].stale_time, | |
825 | &peer->t_llgr_stale[afi][safi]); | |
1479ed2f DA |
826 | |
827 | for (ALL_LIST_ELEMENTS(peer->bgp->peer, node, nnode, | |
828 | tmp_peer)) | |
829 | bgp_announce_route(tmp_peer, afi, safi, false); | |
830 | } else { | |
831 | bgp_clear_stale_route(peer, afi, safi); | |
832 | } | |
833 | } | |
834 | ||
835 | bgp_graceful_restart_timer_off(peer); | |
93406d87 | 836 | } |
837 | ||
e6685141 | 838 | static void bgp_graceful_stale_timer_expire(struct event *thread) |
93406d87 | 839 | { |
d62a17ae | 840 | struct peer *peer; |
841 | afi_t afi; | |
842 | safi_t safi; | |
93406d87 | 843 | |
e16d030c | 844 | peer = EVENT_ARG(thread); |
93406d87 | 845 | |
d62a17ae | 846 | if (bgp_debug_neighbor_events(peer)) |
f70c91dc DA |
847 | zlog_debug("%pBP graceful restart stalepath timer expired", |
848 | peer); | |
93406d87 | 849 | |
d62a17ae | 850 | /* NSF delete stale route */ |
df8d723c DA |
851 | FOREACH_AFI_SAFI_NSF (afi, safi) |
852 | if (peer->nsf[afi][safi]) | |
853 | bgp_clear_stale_route(peer, afi, safi); | |
93406d87 | 854 | } |
855 | ||
f009ff26 | 856 | /* Selection deferral timer processing function */ |
e6685141 | 857 | static void bgp_graceful_deferral_timer_expire(struct event *thread) |
f009ff26 | 858 | { |
859 | struct afi_safi_info *info; | |
860 | afi_t afi; | |
861 | safi_t safi; | |
862 | struct bgp *bgp; | |
863 | ||
e16d030c | 864 | info = EVENT_ARG(thread); |
f009ff26 | 865 | afi = info->afi; |
866 | safi = info->safi; | |
867 | bgp = info->bgp; | |
868 | ||
869 | if (BGP_DEBUG(update, UPDATE_OUT)) | |
13909c4f DS |
870 | zlog_debug( |
871 | "afi %d, safi %d : graceful restart deferral timer expired", | |
872 | afi, safi); | |
f009ff26 | 873 | |
f009ff26 | 874 | bgp->gr_info[afi][safi].eor_required = 0; |
875 | bgp->gr_info[afi][safi].eor_received = 0; | |
876 | XFREE(MTYPE_TMP, info); | |
877 | ||
878 | /* Best path selection */ | |
cc9f21da | 879 | bgp_best_path_select_defer(bgp, afi, safi); |
f009ff26 | 880 | } |
881 | ||
3dc339cd | 882 | static bool bgp_update_delay_applicable(struct bgp *bgp) |
f188f2c4 | 883 | { |
d62a17ae | 884 | /* update_delay_over flag should be reset (set to 0) for any new |
885 | applicability of the update-delay during BGP process lifetime. | |
886 | And it should be set after an occurence of the update-delay is | |
887 | over)*/ | |
888 | if (!bgp->update_delay_over) | |
3dc339cd DA |
889 | return true; |
890 | return false; | |
f188f2c4 DS |
891 | } |
892 | ||
3dc339cd | 893 | bool bgp_update_delay_active(struct bgp *bgp) |
f188f2c4 | 894 | { |
d62a17ae | 895 | if (bgp->t_update_delay) |
3dc339cd DA |
896 | return true; |
897 | return false; | |
f188f2c4 DS |
898 | } |
899 | ||
3dc339cd | 900 | bool bgp_update_delay_configured(struct bgp *bgp) |
f188f2c4 | 901 | { |
d62a17ae | 902 | if (bgp->v_update_delay) |
3dc339cd DA |
903 | return true; |
904 | return false; | |
f188f2c4 DS |
905 | } |
906 | ||
907 | /* Do the post-processing needed when bgp comes out of the read-only mode | |
908 | on ending the update delay. */ | |
d62a17ae | 909 | void bgp_update_delay_end(struct bgp *bgp) |
f188f2c4 | 910 | { |
e16d030c DS |
911 | EVENT_OFF(bgp->t_update_delay); |
912 | EVENT_OFF(bgp->t_establish_wait); | |
d62a17ae | 913 | |
914 | /* Reset update-delay related state */ | |
915 | bgp->update_delay_over = 1; | |
916 | bgp->established = 0; | |
917 | bgp->restarted_peers = 0; | |
918 | bgp->implicit_eors = 0; | |
919 | bgp->explicit_eors = 0; | |
920 | ||
e36f61b5 DS |
921 | frr_timestamp(3, bgp->update_delay_end_time, |
922 | sizeof(bgp->update_delay_end_time)); | |
d62a17ae | 923 | |
924 | /* | |
925 | * Add an end-of-initial-update marker to the main process queues so | |
926 | * that | |
927 | * the route advertisement timer for the peers can be started. Also set | |
928 | * the zebra and peer update hold flags. These flags are used to achieve | |
929 | * three stages in the update-delay post processing: | |
930 | * 1. Finish best-path selection for all the prefixes held on the | |
931 | * queues. | |
932 | * (routes in BGP are updated, and peers sync queues are populated | |
933 | * too) | |
934 | * 2. As the eoiu mark is reached in the bgp process routine, ship all | |
935 | * the | |
936 | * routes to zebra. With that zebra should see updates from BGP | |
937 | * close | |
938 | * to each other. | |
939 | * 3. Unblock the peer update writes. With that peer update packing | |
940 | * with | |
941 | * the prefixes should be at its maximum. | |
942 | */ | |
943 | bgp_add_eoiu_mark(bgp); | |
944 | bgp->main_zebra_update_hold = 1; | |
945 | bgp->main_peers_update_hold = 1; | |
946 | ||
b6c386bb DS |
947 | /* |
948 | * Resume the queue processing. This should trigger the event that would | |
949 | * take care of processing any work that was queued during the read-only | |
950 | * mode. | |
951 | */ | |
952 | work_queue_unplug(bgp->process_queue); | |
f188f2c4 DS |
953 | } |
954 | ||
cb1faec9 DS |
955 | /** |
956 | * see bgp_fsm.h | |
957 | */ | |
d62a17ae | 958 | void bgp_start_routeadv(struct bgp *bgp) |
cb1faec9 | 959 | { |
d62a17ae | 960 | struct listnode *node, *nnode; |
961 | struct peer *peer; | |
cb1faec9 | 962 | |
a10c2872 | 963 | zlog_info("%s, update hold status %d", __func__, |
d62a17ae | 964 | bgp->main_peers_update_hold); |
4a16ae86 | 965 | |
d62a17ae | 966 | if (bgp->main_peers_update_hold) |
967 | return; | |
4a16ae86 | 968 | |
e36f61b5 DS |
969 | frr_timestamp(3, bgp->update_delay_peers_resume_time, |
970 | sizeof(bgp->update_delay_peers_resume_time)); | |
4a16ae86 | 971 | |
d62a17ae | 972 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) { |
feb17238 | 973 | if (!peer_established(peer)) |
d62a17ae | 974 | continue; |
e16d030c | 975 | EVENT_OFF(peer->t_routeadv); |
d62a17ae | 976 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); |
977 | } | |
cb1faec9 DS |
978 | } |
979 | ||
980 | /** | |
981 | * see bgp_fsm.h | |
982 | */ | |
d62a17ae | 983 | void bgp_adjust_routeadv(struct peer *peer) |
cb1faec9 | 984 | { |
083ec940 | 985 | time_t nowtime = monotime(NULL); |
d62a17ae | 986 | double diff; |
987 | unsigned long remain; | |
988 | ||
989 | /* Bypass checks for special case of MRAI being 0 */ | |
990 | if (peer->v_routeadv == 0) { | |
991 | /* Stop existing timer, just in case it is running for a | |
992 | * different | |
993 | * duration and schedule write thread immediately. | |
994 | */ | |
e16d030c | 995 | EVENT_OFF(peer->t_routeadv); |
d62a17ae | 996 | |
083ec940 | 997 | peer->synctime = monotime(NULL); |
a77e2f4b S |
998 | /* If suppress fib pending is enabled, route is advertised to |
999 | * peers when the status is received from the FIB. The delay | |
1000 | * is added to update group packet generate which will allow | |
1001 | * more routes to be sent in the update message | |
1002 | */ | |
1003 | BGP_UPDATE_GROUP_TIMER_ON(&peer->t_generate_updgrp_packets, | |
1004 | bgp_generate_updgrp_packets); | |
d62a17ae | 1005 | return; |
1006 | } | |
1007 | ||
1008 | ||
1009 | /* | |
1010 | * CASE I: | |
1011 | * If the last update was written more than MRAI back, expire the timer | |
1012 | * instantly so that we can send the update out sooner. | |
1013 | * | |
1014 | * <------- MRAI ---------> | |
1015 | * |-----------------|-----------------------| | |
1016 | * <------------- m ------------> | |
1017 | * ^ ^ ^ | |
1018 | * | | | | |
1019 | * | | current time | |
1020 | * | timer start | |
1021 | * last write | |
1022 | * | |
1023 | * m > MRAI | |
1024 | */ | |
1025 | diff = difftime(nowtime, peer->last_update); | |
1026 | if (diff > (double)peer->v_routeadv) { | |
e16d030c | 1027 | EVENT_OFF(peer->t_routeadv); |
d62a17ae | 1028 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); |
1029 | return; | |
1030 | } | |
1031 | ||
1032 | /* | |
1033 | * CASE II: | |
1034 | * - Find when to expire the MRAI timer. | |
1035 | * If MRAI timer is not active, assume we can start it now. | |
1036 | * | |
1037 | * <------- MRAI ---------> | |
1038 | * |------------|-----------------------| | |
1039 | * <-------- m ----------><----- r -----> | |
1040 | * ^ ^ ^ | |
1041 | * | | | | |
1042 | * | | current time | |
1043 | * | timer start | |
1044 | * last write | |
1045 | * | |
1046 | * (MRAI - m) < r | |
1047 | */ | |
1048 | if (peer->t_routeadv) | |
4f830a07 | 1049 | remain = event_timer_remain_second(peer->t_routeadv); |
d62a17ae | 1050 | else |
1051 | remain = peer->v_routeadv; | |
1052 | diff = peer->v_routeadv - diff; | |
1053 | if (diff <= (double)remain) { | |
e16d030c | 1054 | EVENT_OFF(peer->t_routeadv); |
d62a17ae | 1055 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, diff); |
1056 | } | |
cb1faec9 DS |
1057 | } |
1058 | ||
3dc339cd | 1059 | static bool bgp_maxmed_onstartup_applicable(struct bgp *bgp) |
abc920f8 | 1060 | { |
d62a17ae | 1061 | if (!bgp->maxmed_onstartup_over) |
3dc339cd DA |
1062 | return true; |
1063 | return false; | |
abc920f8 DS |
1064 | } |
1065 | ||
3dc339cd | 1066 | bool bgp_maxmed_onstartup_configured(struct bgp *bgp) |
abc920f8 | 1067 | { |
d62a17ae | 1068 | if (bgp->v_maxmed_onstartup != BGP_MAXMED_ONSTARTUP_UNCONFIGURED) |
3dc339cd DA |
1069 | return true; |
1070 | return false; | |
abc920f8 DS |
1071 | } |
1072 | ||
3dc339cd | 1073 | bool bgp_maxmed_onstartup_active(struct bgp *bgp) |
abc920f8 | 1074 | { |
d62a17ae | 1075 | if (bgp->t_maxmed_onstartup) |
3dc339cd DA |
1076 | return true; |
1077 | return false; | |
abc920f8 DS |
1078 | } |
1079 | ||
d62a17ae | 1080 | void bgp_maxmed_update(struct bgp *bgp) |
abc920f8 | 1081 | { |
d7c0a89a QY |
1082 | uint8_t maxmed_active; |
1083 | uint32_t maxmed_value; | |
d62a17ae | 1084 | |
1085 | if (bgp->v_maxmed_admin) { | |
1086 | maxmed_active = 1; | |
1087 | maxmed_value = bgp->maxmed_admin_value; | |
1088 | } else if (bgp->t_maxmed_onstartup) { | |
1089 | maxmed_active = 1; | |
1090 | maxmed_value = bgp->maxmed_onstartup_value; | |
1091 | } else { | |
1092 | maxmed_active = 0; | |
1093 | maxmed_value = BGP_MAXMED_VALUE_DEFAULT; | |
1094 | } | |
1095 | ||
1096 | if (bgp->maxmed_active != maxmed_active | |
1097 | || bgp->maxmed_value != maxmed_value) { | |
1098 | bgp->maxmed_active = maxmed_active; | |
1099 | bgp->maxmed_value = maxmed_value; | |
1100 | ||
1101 | update_group_announce(bgp); | |
1102 | } | |
abc920f8 DS |
1103 | } |
1104 | ||
3893aeee DA |
1105 | int bgp_fsm_error_subcode(int status) |
1106 | { | |
1107 | int fsm_err_subcode = BGP_NOTIFY_FSM_ERR_SUBCODE_UNSPECIFIC; | |
1108 | ||
1109 | switch (status) { | |
1110 | case OpenSent: | |
1111 | fsm_err_subcode = BGP_NOTIFY_FSM_ERR_SUBCODE_OPENSENT; | |
1112 | break; | |
1113 | case OpenConfirm: | |
1114 | fsm_err_subcode = BGP_NOTIFY_FSM_ERR_SUBCODE_OPENCONFIRM; | |
1115 | break; | |
1116 | case Established: | |
1117 | fsm_err_subcode = BGP_NOTIFY_FSM_ERR_SUBCODE_ESTABLISHED; | |
1118 | break; | |
1119 | default: | |
1120 | break; | |
1121 | } | |
1122 | ||
1123 | return fsm_err_subcode; | |
1124 | } | |
1125 | ||
abc920f8 | 1126 | /* The maxmed onstartup timer expiry callback. */ |
e6685141 | 1127 | static void bgp_maxmed_onstartup_timer(struct event *thread) |
abc920f8 | 1128 | { |
d62a17ae | 1129 | struct bgp *bgp; |
abc920f8 | 1130 | |
d62a17ae | 1131 | zlog_info("Max med on startup ended - timer expired."); |
abc920f8 | 1132 | |
e16d030c DS |
1133 | bgp = EVENT_ARG(thread); |
1134 | EVENT_OFF(bgp->t_maxmed_onstartup); | |
d62a17ae | 1135 | bgp->maxmed_onstartup_over = 1; |
abc920f8 | 1136 | |
d62a17ae | 1137 | bgp_maxmed_update(bgp); |
abc920f8 DS |
1138 | } |
1139 | ||
d62a17ae | 1140 | static void bgp_maxmed_onstartup_begin(struct bgp *bgp) |
abc920f8 | 1141 | { |
d62a17ae | 1142 | /* Applicable only once in the process lifetime on the startup */ |
1143 | if (bgp->maxmed_onstartup_over) | |
1144 | return; | |
abc920f8 | 1145 | |
d62a17ae | 1146 | zlog_info("Begin maxmed onstartup mode - timer %d seconds", |
1147 | bgp->v_maxmed_onstartup); | |
abc920f8 | 1148 | |
907a2395 DS |
1149 | event_add_timer(bm->master, bgp_maxmed_onstartup_timer, bgp, |
1150 | bgp->v_maxmed_onstartup, &bgp->t_maxmed_onstartup); | |
abc920f8 | 1151 | |
d62a17ae | 1152 | if (!bgp->v_maxmed_admin) { |
1153 | bgp->maxmed_active = 1; | |
1154 | bgp->maxmed_value = bgp->maxmed_onstartup_value; | |
1155 | } | |
abc920f8 | 1156 | |
d62a17ae | 1157 | /* Route announce to all peers should happen after this in |
1158 | * bgp_establish() */ | |
abc920f8 DS |
1159 | } |
1160 | ||
d62a17ae | 1161 | static void bgp_maxmed_onstartup_process_status_change(struct peer *peer) |
abc920f8 | 1162 | { |
feb17238 | 1163 | if (peer_established(peer) && !peer->bgp->established) { |
d62a17ae | 1164 | bgp_maxmed_onstartup_begin(peer->bgp); |
1165 | } | |
abc920f8 DS |
1166 | } |
1167 | ||
f188f2c4 | 1168 | /* The update delay timer expiry callback. */ |
e6685141 | 1169 | static void bgp_update_delay_timer(struct event *thread) |
f188f2c4 | 1170 | { |
d62a17ae | 1171 | struct bgp *bgp; |
f188f2c4 | 1172 | |
d62a17ae | 1173 | zlog_info("Update delay ended - timer expired."); |
f188f2c4 | 1174 | |
e16d030c DS |
1175 | bgp = EVENT_ARG(thread); |
1176 | EVENT_OFF(bgp->t_update_delay); | |
d62a17ae | 1177 | bgp_update_delay_end(bgp); |
f188f2c4 DS |
1178 | } |
1179 | ||
1180 | /* The establish wait timer expiry callback. */ | |
e6685141 | 1181 | static void bgp_establish_wait_timer(struct event *thread) |
f188f2c4 | 1182 | { |
d62a17ae | 1183 | struct bgp *bgp; |
f188f2c4 | 1184 | |
d62a17ae | 1185 | zlog_info("Establish wait - timer expired."); |
f188f2c4 | 1186 | |
e16d030c DS |
1187 | bgp = EVENT_ARG(thread); |
1188 | EVENT_OFF(bgp->t_establish_wait); | |
d62a17ae | 1189 | bgp_check_update_delay(bgp); |
f188f2c4 DS |
1190 | } |
1191 | ||
1192 | /* Steps to begin the update delay: | |
1193 | - initialize queues if needed | |
1194 | - stop the queue processing | |
1195 | - start the timer */ | |
d62a17ae | 1196 | static void bgp_update_delay_begin(struct bgp *bgp) |
f188f2c4 | 1197 | { |
d62a17ae | 1198 | struct listnode *node, *nnode; |
1199 | struct peer *peer; | |
f188f2c4 | 1200 | |
d62a17ae | 1201 | /* Stop the processing of queued work. Enqueue shall continue */ |
b6c386bb | 1202 | work_queue_plug(bgp->process_queue); |
f188f2c4 | 1203 | |
d62a17ae | 1204 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) |
1205 | peer->update_delay_over = 0; | |
f188f2c4 | 1206 | |
d62a17ae | 1207 | /* Start the update-delay timer */ |
907a2395 DS |
1208 | event_add_timer(bm->master, bgp_update_delay_timer, bgp, |
1209 | bgp->v_update_delay, &bgp->t_update_delay); | |
f188f2c4 | 1210 | |
d62a17ae | 1211 | if (bgp->v_establish_wait != bgp->v_update_delay) |
907a2395 DS |
1212 | event_add_timer(bm->master, bgp_establish_wait_timer, bgp, |
1213 | bgp->v_establish_wait, &bgp->t_establish_wait); | |
f188f2c4 | 1214 | |
e36f61b5 DS |
1215 | frr_timestamp(3, bgp->update_delay_begin_time, |
1216 | sizeof(bgp->update_delay_begin_time)); | |
f188f2c4 DS |
1217 | } |
1218 | ||
d62a17ae | 1219 | static void bgp_update_delay_process_status_change(struct peer *peer) |
f188f2c4 | 1220 | { |
feb17238 | 1221 | if (peer_established(peer)) { |
d62a17ae | 1222 | if (!peer->bgp->established++) { |
1223 | bgp_update_delay_begin(peer->bgp); | |
1224 | zlog_info( | |
1225 | "Begin read-only mode - update-delay timer %d seconds", | |
1226 | peer->bgp->v_update_delay); | |
1227 | } | |
54394daa | 1228 | if (CHECK_FLAG(peer->cap, PEER_CAP_GRACEFUL_RESTART_R_BIT_RCV)) |
d62a17ae | 1229 | bgp_update_restarted_peers(peer); |
1230 | } | |
1231 | if (peer->ostatus == Established | |
1232 | && bgp_update_delay_active(peer->bgp)) { | |
1233 | /* Adjust the update-delay state to account for this flap. | |
1234 | NOTE: Intentionally skipping adjusting implicit_eors or | |
1235 | explicit_eors | |
1236 | counters. Extra sanity check in bgp_check_update_delay() | |
1237 | should | |
1238 | be enough to take care of any additive discrepancy in bgp eor | |
1239 | counters */ | |
1240 | peer->bgp->established--; | |
1241 | peer->update_delay_over = 0; | |
1242 | } | |
f188f2c4 DS |
1243 | } |
1244 | ||
0437e105 | 1245 | /* Called after event occurred, this function change status and reset |
200df115 | 1246 | read/write and timer thread. */ |
881979e4 | 1247 | void bgp_fsm_change_status(struct peer *peer, enum bgp_fsm_status status) |
200df115 | 1248 | { |
36dc7588 | 1249 | struct bgp *bgp; |
1250 | uint32_t peer_count; | |
1ff9a340 | 1251 | |
36dc7588 | 1252 | bgp = peer->bgp; |
1253 | peer_count = bgp->established_peers; | |
1254 | ||
1255 | if (status == Established) | |
1256 | bgp->established_peers++; | |
feb17238 | 1257 | else if ((peer_established(peer)) && (status != Established)) |
36dc7588 | 1258 | bgp->established_peers--; |
1259 | ||
1cfe005d DS |
1260 | if (bgp_debug_neighbor_events(peer)) { |
1261 | struct vrf *vrf = vrf_lookup_by_id(bgp->vrf_id); | |
1262 | ||
1263 | zlog_debug("%s : vrf %s(%u), Status: %s established_peers %u", __func__, | |
1264 | vrf ? vrf->name : "Unknown", bgp->vrf_id, | |
1265 | lookup_msg(bgp_status_msg, status, NULL), | |
1266 | bgp->established_peers); | |
1267 | } | |
1268 | ||
36dc7588 | 1269 | /* Set to router ID to the value provided by RIB if there are no peers |
1270 | * in the established state and peer count did not change | |
1271 | */ | |
1272 | if ((peer_count != bgp->established_peers) && | |
1273 | (bgp->established_peers == 0)) | |
1274 | bgp_router_id_zebra_bump(bgp->vrf_id, NULL); | |
1275 | ||
d62a17ae | 1276 | /* Transition into Clearing or Deleted must /always/ clear all routes.. |
1277 | * (and must do so before actually changing into Deleted.. | |
1278 | */ | |
1279 | if (status >= Clearing) { | |
1280 | bgp_clear_route_all(peer); | |
1281 | ||
1282 | /* If no route was queued for the clear-node processing, | |
1283 | * generate the | |
1284 | * completion event here. This is needed because if there are no | |
1285 | * routes | |
1286 | * to trigger the background clear-node thread, the event won't | |
1287 | * get | |
1288 | * generated and the peer would be stuck in Clearing. Note that | |
1289 | * this | |
1290 | * event is for the peer and helps the peer transition out of | |
1291 | * Clearing | |
1292 | * state; it should not be generated per (AFI,SAFI). The event | |
1293 | * is | |
1294 | * directly posted here without calling clear_node_complete() as | |
1295 | * we | |
1296 | * shouldn't do an extra unlock. This event will get processed | |
1297 | * after | |
1298 | * the state change that happens below, so peer will be in | |
1299 | * Clearing | |
1300 | * (or Deleted). | |
1301 | */ | |
69ef3f31 DS |
1302 | if (!work_queue_is_scheduled(peer->clear_node_queue) && |
1303 | status != Deleted) | |
d62a17ae | 1304 | BGP_EVENT_ADD(peer, Clearing_Completed); |
1305 | } | |
1306 | ||
1307 | /* Preserve old status and change into new status. */ | |
1308 | peer->ostatus = peer->status; | |
1309 | peer->status = status; | |
1310 | ||
8336c896 DA |
1311 | /* Reset received keepalives counter on every FSM change */ |
1312 | peer->rtt_keepalive_rcv = 0; | |
1313 | ||
05e68acc | 1314 | /* Fire backward transition hook if that's the case */ |
adf552ab | 1315 | if (peer->ostatus == Established && peer->status != Established) |
05e68acc BC |
1316 | hook_call(peer_backward_transition, peer); |
1317 | ||
d62a17ae | 1318 | /* Save event that caused status change. */ |
1319 | peer->last_major_event = peer->cur_event; | |
1320 | ||
7d8d0eab MKS |
1321 | /* Operations after status change */ |
1322 | hook_call(peer_status_changed, peer); | |
1323 | ||
d62a17ae | 1324 | if (status == Established) |
1325 | UNSET_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER); | |
1326 | ||
1327 | /* If max-med processing is applicable, do the necessary. */ | |
1328 | if (status == Established) { | |
1329 | if (bgp_maxmed_onstartup_configured(peer->bgp) | |
1330 | && bgp_maxmed_onstartup_applicable(peer->bgp)) | |
1331 | bgp_maxmed_onstartup_process_status_change(peer); | |
1332 | else | |
1333 | peer->bgp->maxmed_onstartup_over = 1; | |
1334 | } | |
1335 | ||
1336 | /* If update-delay processing is applicable, do the necessary. */ | |
1337 | if (bgp_update_delay_configured(peer->bgp) | |
1338 | && bgp_update_delay_applicable(peer->bgp)) | |
1339 | bgp_update_delay_process_status_change(peer); | |
1340 | ||
1341 | if (bgp_debug_neighbor_events(peer)) | |
71d276c8 | 1342 | zlog_debug("%s fd %d went from %s to %s", peer->host, peer->fd, |
d62a17ae | 1343 | lookup_msg(bgp_status_msg, peer->ostatus, NULL), |
1344 | lookup_msg(bgp_status_msg, peer->status, NULL)); | |
200df115 | 1345 | } |
1346 | ||
3117b5c4 | 1347 | /* Flush the event queue and ensure the peer is shut down */ |
4da144f3 | 1348 | static enum bgp_fsm_state_progress bgp_clearing_completed(struct peer *peer) |
3117b5c4 | 1349 | { |
4da144f3 | 1350 | enum bgp_fsm_state_progress rc = bgp_stop(peer); |
1ff9a340 | 1351 | |
4da144f3 | 1352 | if (rc >= BGP_FSM_SUCCESS) |
d62a17ae | 1353 | BGP_EVENT_FLUSH(peer); |
3117b5c4 | 1354 | |
d62a17ae | 1355 | return rc; |
3117b5c4 SH |
1356 | } |
1357 | ||
718e3744 | 1358 | /* Administrative BGP peer stop event. */ |
3117b5c4 | 1359 | /* May be called multiple times for the same peer */ |
4da144f3 | 1360 | enum bgp_fsm_state_progress bgp_stop(struct peer *peer) |
718e3744 | 1361 | { |
d62a17ae | 1362 | afi_t afi; |
1363 | safi_t safi; | |
1364 | char orf_name[BUFSIZ]; | |
4da144f3 | 1365 | enum bgp_fsm_state_progress ret = BGP_FSM_SUCCESS; |
f009ff26 | 1366 | struct bgp *bgp = peer->bgp; |
1367 | struct graceful_restart_info *gr_info = NULL; | |
d62a17ae | 1368 | |
2ba1fe69 | 1369 | peer->nsf_af_count = 0; |
1370 | ||
e7db872b | 1371 | /* deregister peer */ |
21bfce98 RZ |
1372 | if (peer->bfd_config |
1373 | && peer->last_reset == PEER_DOWN_UPDATE_SOURCE_CHANGE) | |
1374 | bfd_sess_uninstall(peer->bfd_config->session); | |
e7db872b | 1375 | |
af8496af DA |
1376 | if (peer_dynamic_neighbor_no_nsf(peer) && |
1377 | !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
d62a17ae | 1378 | if (bgp_debug_neighbor_events(peer)) |
31afff83 DA |
1379 | zlog_debug("%s (dynamic neighbor) deleted (%s)", |
1380 | peer->host, __func__); | |
d62a17ae | 1381 | peer_delete(peer); |
4da144f3 | 1382 | return BGP_FSM_FAILURE_AND_DELETE; |
c22767d8 | 1383 | } |
848973c7 | 1384 | |
d62a17ae | 1385 | /* Can't do this in Clearing; events are used for state transitions */ |
1386 | if (peer->status != Clearing) { | |
1387 | /* Delete all existing events of the peer */ | |
1388 | BGP_EVENT_FLUSH(peer); | |
93406d87 | 1389 | } |
d62a17ae | 1390 | |
1391 | /* Increment Dropped count. */ | |
feb17238 | 1392 | if (peer_established(peer)) { |
d62a17ae | 1393 | peer->dropped++; |
1394 | ||
07753623 DA |
1395 | /* Notify BGP conditional advertisement process */ |
1396 | peer->advmap_table_change = true; | |
1397 | ||
d62a17ae | 1398 | /* bgp log-neighbor-changes of neighbor Down */ |
892fedb6 DA |
1399 | if (CHECK_FLAG(peer->bgp->flags, |
1400 | BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { | |
d62a17ae | 1401 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); |
2986cac2 | 1402 | |
d62a17ae | 1403 | zlog_info( |
f70c91dc DA |
1404 | "%%ADJCHANGE: neighbor %pBP in vrf %s Down %s", |
1405 | peer, | |
5742e42b | 1406 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) |
a7d91a8c DA |
1407 | ? vrf->name |
1408 | : VRF_DEFAULT_NAME) | |
d62a17ae | 1409 | : "", |
1410 | peer_down_str[(int)peer->last_reset]); | |
1411 | } | |
1412 | ||
1413 | /* graceful restart */ | |
1414 | if (peer->t_gr_stale) { | |
e16d030c | 1415 | EVENT_OFF(peer->t_gr_stale); |
d62a17ae | 1416 | if (bgp_debug_neighbor_events(peer)) |
1417 | zlog_debug( | |
f70c91dc DA |
1418 | "%pBP graceful restart stalepath timer stopped", |
1419 | peer); | |
d62a17ae | 1420 | } |
1421 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
1422 | if (bgp_debug_neighbor_events(peer)) { | |
1423 | zlog_debug( | |
f70c91dc DA |
1424 | "%pBP graceful restart timer started for %d sec", |
1425 | peer, peer->v_gr_restart); | |
d62a17ae | 1426 | zlog_debug( |
f70c91dc DA |
1427 | "%pBP graceful restart stalepath timer started for %d sec", |
1428 | peer, peer->bgp->stalepath_time); | |
d62a17ae | 1429 | } |
1430 | BGP_TIMER_ON(peer->t_gr_restart, | |
1431 | bgp_graceful_restart_timer_expire, | |
1432 | peer->v_gr_restart); | |
1433 | BGP_TIMER_ON(peer->t_gr_stale, | |
1434 | bgp_graceful_stale_timer_expire, | |
1435 | peer->bgp->stalepath_time); | |
1436 | } else { | |
1437 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1438 | ||
df8d723c DA |
1439 | FOREACH_AFI_SAFI_NSF (afi, safi) |
1440 | peer->nsf[afi][safi] = 0; | |
d62a17ae | 1441 | } |
1442 | ||
9af52ccf DA |
1443 | /* Stop route-refresh stalepath timer */ |
1444 | if (peer->t_refresh_stalepath) { | |
e16d030c | 1445 | EVENT_OFF(peer->t_refresh_stalepath); |
9af52ccf DA |
1446 | |
1447 | if (bgp_debug_neighbor_events(peer)) | |
1448 | zlog_debug( | |
f70c91dc DA |
1449 | "%pBP route-refresh restart stalepath timer stopped", |
1450 | peer); | |
9af52ccf DA |
1451 | } |
1452 | ||
f009ff26 | 1453 | /* If peer reset before receiving EOR, decrement EOR count and |
1454 | * cancel the selection deferral timer if there are no | |
1455 | * pending EOR messages to be received | |
1456 | */ | |
1457 | if (BGP_PEER_GRACEFUL_RESTART_CAPABLE(peer)) { | |
1458 | FOREACH_AFI_SAFI (afi, safi) { | |
13909c4f DS |
1459 | if (!peer->afc_nego[afi][safi] |
1460 | || CHECK_FLAG(peer->af_sflags[afi][safi], | |
1461 | PEER_STATUS_EOR_RECEIVED)) | |
1462 | continue; | |
1463 | ||
1464 | gr_info = &bgp->gr_info[afi][safi]; | |
1465 | if (!gr_info) | |
1466 | continue; | |
1467 | ||
1468 | if (gr_info->eor_required) | |
1469 | gr_info->eor_required--; | |
1470 | ||
1471 | if (BGP_DEBUG(update, UPDATE_OUT)) | |
1472 | zlog_debug("peer %s, EOR_required %d", | |
1473 | peer->host, | |
1474 | gr_info->eor_required); | |
1475 | ||
1476 | /* There is no pending EOR message */ | |
1477 | if (gr_info->eor_required == 0) { | |
b96b4f1c | 1478 | if (gr_info->t_select_deferral) { |
e16d030c | 1479 | void *info = EVENT_ARG( |
b96b4f1c SB |
1480 | gr_info->t_select_deferral); |
1481 | XFREE(MTYPE_TMP, info); | |
1482 | } | |
e16d030c | 1483 | EVENT_OFF(gr_info->t_select_deferral); |
13909c4f | 1484 | gr_info->eor_received = 0; |
f009ff26 | 1485 | } |
1486 | } | |
1487 | } | |
1488 | ||
d62a17ae | 1489 | /* set last reset time */ |
083ec940 | 1490 | peer->resettime = peer->uptime = monotime(NULL); |
d62a17ae | 1491 | |
1492 | if (BGP_DEBUG(update_groups, UPDATE_GROUPS)) | |
1493 | zlog_debug("%s remove from all update group", | |
1494 | peer->host); | |
1495 | update_group_remove_peer_afs(peer); | |
1496 | ||
d62a17ae | 1497 | /* Reset peer synctime */ |
1498 | peer->synctime = 0; | |
93406d87 | 1499 | } |
93406d87 | 1500 | |
424ab01d | 1501 | /* stop keepalives */ |
b72b6f4f | 1502 | bgp_keepalives_off(peer); |
424ab01d QY |
1503 | |
1504 | /* Stop read and write threads. */ | |
1505 | bgp_writes_off(peer); | |
1506 | bgp_reads_off(peer); | |
1507 | ||
e16d030c DS |
1508 | EVENT_OFF(peer->t_connect_check_r); |
1509 | EVENT_OFF(peer->t_connect_check_w); | |
d62a17ae | 1510 | |
1511 | /* Stop all timers. */ | |
e16d030c DS |
1512 | EVENT_OFF(peer->t_start); |
1513 | EVENT_OFF(peer->t_connect); | |
1514 | EVENT_OFF(peer->t_holdtime); | |
1515 | EVENT_OFF(peer->t_routeadv); | |
1516 | EVENT_OFF(peer->t_delayopen); | |
d62a17ae | 1517 | |
1518 | /* Clear input and output buffer. */ | |
cb1991af | 1519 | frr_with_mutex (&peer->io_mtx) { |
424ab01d QY |
1520 | if (peer->ibuf) |
1521 | stream_fifo_clean(peer->ibuf); | |
d3ecc69e QY |
1522 | if (peer->obuf) |
1523 | stream_fifo_clean(peer->obuf); | |
424ab01d QY |
1524 | |
1525 | if (peer->ibuf_work) | |
74ffbfe6 | 1526 | ringbuf_wipe(peer->ibuf_work); |
424ab01d QY |
1527 | if (peer->obuf_work) |
1528 | stream_reset(peer->obuf_work); | |
1529 | ||
1530 | if (peer->curr) { | |
1531 | stream_free(peer->curr); | |
1532 | peer->curr = NULL; | |
1533 | } | |
d3ecc69e | 1534 | } |
d62a17ae | 1535 | |
1536 | /* Close of file descriptor. */ | |
1537 | if (peer->fd >= 0) { | |
1538 | close(peer->fd); | |
1539 | peer->fd = -1; | |
93406d87 | 1540 | } |
1541 | ||
24f569e9 AS |
1542 | /* Reset capabilities. */ |
1543 | peer->cap = 0; | |
1544 | ||
d864dd9e | 1545 | /* Resetting neighbor role to the default value */ |
8f2d6021 | 1546 | peer->remote_role = ROLE_UNDEFINED; |
d864dd9e | 1547 | |
05c7a1cc QY |
1548 | FOREACH_AFI_SAFI (afi, safi) { |
1549 | /* Reset all negotiated variables */ | |
1550 | peer->afc_nego[afi][safi] = 0; | |
1551 | peer->afc_adv[afi][safi] = 0; | |
1552 | peer->afc_recv[afi][safi] = 0; | |
1553 | ||
1554 | /* peer address family capability flags*/ | |
1555 | peer->af_cap[afi][safi] = 0; | |
1556 | ||
1557 | /* peer address family status flags*/ | |
1558 | peer->af_sflags[afi][safi] = 0; | |
1559 | ||
1560 | /* Received ORF prefix-filter */ | |
1561 | peer->orf_plist[afi][safi] = NULL; | |
1562 | ||
feb17238 | 1563 | if ((peer->status == OpenConfirm) || (peer_established(peer))) { |
05c7a1cc | 1564 | /* ORF received prefix-filter pnt */ |
fc746f1c QY |
1565 | snprintf(orf_name, sizeof(orf_name), "%s.%d.%d", |
1566 | peer->host, afi, safi); | |
05c7a1cc | 1567 | prefix_bgp_orf_remove_all(afi, orf_name); |
d62a17ae | 1568 | } |
05c7a1cc | 1569 | } |
d62a17ae | 1570 | |
1571 | /* Reset keepalive and holdtime */ | |
b90a8e13 | 1572 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER)) { |
d62a17ae | 1573 | peer->v_keepalive = peer->keepalive; |
1574 | peer->v_holdtime = peer->holdtime; | |
1575 | } else { | |
1576 | peer->v_keepalive = peer->bgp->default_keepalive; | |
1577 | peer->v_holdtime = peer->bgp->default_holdtime; | |
1ff9a340 | 1578 | } |
d62a17ae | 1579 | |
6c537a18 DS |
1580 | /* Reset DelayOpenTime */ |
1581 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER_DELAYOPEN)) | |
1582 | peer->v_delayopen = peer->delayopen; | |
1583 | else | |
1584 | peer->v_delayopen = peer->bgp->default_delayopen; | |
1585 | ||
d62a17ae | 1586 | peer->update_time = 0; |
1587 | ||
d62a17ae | 1588 | if (!CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE) |
1589 | && !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
1590 | peer_delete(peer); | |
4da144f3 | 1591 | ret = BGP_FSM_FAILURE_AND_DELETE; |
d62a17ae | 1592 | } else { |
1593 | bgp_peer_conf_if_to_su_update(peer); | |
1594 | } | |
d62a17ae | 1595 | return ret; |
718e3744 | 1596 | } |
1597 | ||
1598 | /* BGP peer is stoped by the error. */ | |
4da144f3 | 1599 | static enum bgp_fsm_state_progress bgp_stop_with_error(struct peer *peer) |
718e3744 | 1600 | { |
d62a17ae | 1601 | /* Double start timer. */ |
1602 | peer->v_start *= 2; | |
1603 | ||
1604 | /* Overflow check. */ | |
1605 | if (peer->v_start >= (60 * 2)) | |
1606 | peer->v_start = (60 * 2); | |
1607 | ||
af8496af | 1608 | if (peer_dynamic_neighbor_no_nsf(peer)) { |
d62a17ae | 1609 | if (bgp_debug_neighbor_events(peer)) |
31afff83 DA |
1610 | zlog_debug("%s (dynamic neighbor) deleted (%s)", |
1611 | peer->host, __func__); | |
d62a17ae | 1612 | peer_delete(peer); |
4da144f3 | 1613 | return BGP_FSM_FAILURE; |
d62a17ae | 1614 | } |
1615 | ||
4da144f3 | 1616 | return bgp_stop(peer); |
718e3744 | 1617 | } |
1618 | ||
397b5bde LR |
1619 | |
1620 | /* something went wrong, send notify and tear down */ | |
4da144f3 DS |
1621 | static enum bgp_fsm_state_progress |
1622 | bgp_stop_with_notify(struct peer *peer, uint8_t code, uint8_t sub_code) | |
397b5bde | 1623 | { |
d62a17ae | 1624 | /* Send notify to remote peer */ |
1625 | bgp_notify_send(peer, code, sub_code); | |
1626 | ||
af8496af | 1627 | if (peer_dynamic_neighbor_no_nsf(peer)) { |
d62a17ae | 1628 | if (bgp_debug_neighbor_events(peer)) |
31afff83 DA |
1629 | zlog_debug("%s (dynamic neighbor) deleted (%s)", |
1630 | peer->host, __func__); | |
d62a17ae | 1631 | peer_delete(peer); |
4da144f3 | 1632 | return BGP_FSM_FAILURE; |
d62a17ae | 1633 | } |
f14e6fdb | 1634 | |
d62a17ae | 1635 | /* Clear start timer value to default. */ |
1636 | peer->v_start = BGP_INIT_START_TIMER; | |
397b5bde | 1637 | |
4da144f3 | 1638 | return bgp_stop(peer); |
397b5bde LR |
1639 | } |
1640 | ||
07a16526 QY |
1641 | /** |
1642 | * Determines whether a TCP session has successfully established for a peer and | |
1643 | * events as appropriate. | |
1644 | * | |
1645 | * This function is called when setting up a new session. After connect() is | |
387f984e QY |
1646 | * called on the peer's socket (in bgp_start()), the fd is passed to poll() |
1647 | * to wait for connection success or failure. When poll() returns, this | |
07a16526 | 1648 | * function is called to evaluate the result. |
387f984e QY |
1649 | * |
1650 | * Due to differences in behavior of poll() on Linux and BSD - specifically, | |
1651 | * the value of .revents in the case of a closed connection - this function is | |
1652 | * scheduled both for a read and a write event. The write event is triggered | |
1653 | * when the connection is established. A read event is triggered when the | |
1654 | * connection is closed. Thus we need to cancel whichever one did not occur. | |
07a16526 | 1655 | */ |
e6685141 | 1656 | static void bgp_connect_check(struct event *thread) |
07a16526 QY |
1657 | { |
1658 | int status; | |
1659 | socklen_t slen; | |
1660 | int ret; | |
1661 | struct peer *peer; | |
1662 | ||
e16d030c | 1663 | peer = EVENT_ARG(thread); |
424ab01d QY |
1664 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); |
1665 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); | |
1666 | assert(!peer->t_read); | |
1667 | assert(!peer->t_write); | |
07a16526 | 1668 | |
e16d030c DS |
1669 | EVENT_OFF(peer->t_connect_check_r); |
1670 | EVENT_OFF(peer->t_connect_check_w); | |
dc1188bb | 1671 | |
07a16526 QY |
1672 | /* Check file descriptor. */ |
1673 | slen = sizeof(status); | |
1674 | ret = getsockopt(peer->fd, SOL_SOCKET, SO_ERROR, (void *)&status, | |
1675 | &slen); | |
1676 | ||
1677 | /* If getsockopt is fail, this is fatal error. */ | |
1678 | if (ret < 0) { | |
4cb5e18b | 1679 | zlog_err("can't get sockopt for nonblocking connect: %d(%s)", |
54ff5e9b | 1680 | errno, safe_strerror(errno)); |
07a16526 | 1681 | BGP_EVENT_ADD(peer, TCP_fatal_error); |
cc9f21da | 1682 | return; |
07a16526 QY |
1683 | } |
1684 | ||
1685 | /* When status is 0 then TCP connection is established. */ | |
1686 | if (status == 0) { | |
6c537a18 DS |
1687 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER_DELAYOPEN)) |
1688 | BGP_EVENT_ADD(peer, TCP_connection_open_w_delay); | |
1689 | else | |
1690 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
cc9f21da | 1691 | return; |
07a16526 QY |
1692 | } else { |
1693 | if (bgp_debug_neighbor_events(peer)) | |
54ff5e9b DS |
1694 | zlog_debug("%s [Event] Connect failed %d(%s)", |
1695 | peer->host, status, safe_strerror(status)); | |
07a16526 | 1696 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); |
cc9f21da | 1697 | return; |
07a16526 QY |
1698 | } |
1699 | } | |
397b5bde | 1700 | |
718e3744 | 1701 | /* TCP connection open. Next we send open message to remote peer. And |
1702 | add read thread for reading open message. */ | |
4da144f3 | 1703 | static enum bgp_fsm_state_progress bgp_connect_success(struct peer *peer) |
718e3744 | 1704 | { |
d62a17ae | 1705 | if (peer->fd < 0) { |
a10c2872 | 1706 | flog_err(EC_BGP_CONNECT, "%s peer's fd is negative value %d", |
1707 | __func__, peer->fd); | |
4da144f3 | 1708 | return bgp_stop(peer); |
d62a17ae | 1709 | } |
1710 | ||
1711 | if (bgp_getsockname(peer) < 0) { | |
450971aa | 1712 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 | 1713 | "%s: bgp_getsockname(): failed for peer %s, fd %d", |
15569c58 | 1714 | __func__, peer->host, peer->fd); |
3893aeee DA |
1715 | bgp_notify_send(peer, BGP_NOTIFY_FSM_ERR, |
1716 | bgp_fsm_error_subcode(peer->status)); | |
424ab01d | 1717 | bgp_writes_on(peer); |
4da144f3 | 1718 | return BGP_FSM_FAILURE; |
d62a17ae | 1719 | } |
1720 | ||
cea8b655 DS |
1721 | /* |
1722 | * If we are doing nht for a peer that ls v6 LL based | |
1723 | * massage the event system to make things happy | |
1724 | */ | |
1725 | bgp_nht_interface_events(peer); | |
1726 | ||
424ab01d | 1727 | bgp_reads_on(peer); |
d62a17ae | 1728 | |
1729 | if (bgp_debug_neighbor_events(peer)) { | |
d62a17ae | 1730 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
c0d72166 DS |
1731 | zlog_debug("%s open active, local address %pSU", |
1732 | peer->host, peer->su_local); | |
d62a17ae | 1733 | else |
1734 | zlog_debug("%s passive open", peer->host); | |
1735 | } | |
1736 | ||
6c537a18 | 1737 | /* Send an open message */ |
d62a17ae | 1738 | bgp_open_send(peer); |
1739 | ||
4da144f3 | 1740 | return BGP_FSM_SUCCESS; |
718e3744 | 1741 | } |
1742 | ||
6c537a18 DS |
1743 | /* TCP connection open with RFC 4271 optional session attribute DelayOpen flag |
1744 | * set. | |
1745 | */ | |
4da144f3 DS |
1746 | static enum bgp_fsm_state_progress |
1747 | bgp_connect_success_w_delayopen(struct peer *peer) | |
6c537a18 DS |
1748 | { |
1749 | if (peer->fd < 0) { | |
1750 | flog_err(EC_BGP_CONNECT, "%s: peer's fd is negative value %d", | |
1751 | __func__, peer->fd); | |
4da144f3 | 1752 | return bgp_stop(peer); |
6c537a18 DS |
1753 | } |
1754 | ||
1755 | if (bgp_getsockname(peer) < 0) { | |
1756 | flog_err_sys(EC_LIB_SOCKET, | |
1757 | "%s: bgp_getsockname(): failed for peer %s, fd %d", | |
1758 | __func__, peer->host, peer->fd); | |
1759 | bgp_notify_send(peer, BGP_NOTIFY_FSM_ERR, | |
1760 | bgp_fsm_error_subcode(peer->status)); | |
1761 | bgp_writes_on(peer); | |
4da144f3 | 1762 | return BGP_FSM_FAILURE; |
6c537a18 DS |
1763 | } |
1764 | ||
cea8b655 DS |
1765 | /* |
1766 | * If we are doing nht for a peer that ls v6 LL based | |
1767 | * massage the event system to make things happy | |
1768 | */ | |
1769 | bgp_nht_interface_events(peer); | |
1770 | ||
6c537a18 DS |
1771 | bgp_reads_on(peer); |
1772 | ||
1773 | if (bgp_debug_neighbor_events(peer)) { | |
6c537a18 | 1774 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) |
c0d72166 DS |
1775 | zlog_debug("%s open active, local address %pSU", |
1776 | peer->host, peer->su_local); | |
6c537a18 DS |
1777 | else |
1778 | zlog_debug("%s passive open", peer->host); | |
1779 | } | |
1780 | ||
1781 | /* set the DelayOpenTime to the inital value */ | |
1782 | peer->v_delayopen = peer->delayopen; | |
1783 | ||
1784 | /* Start the DelayOpenTimer if it is not already running */ | |
1785 | if (!peer->t_delayopen) | |
1786 | BGP_TIMER_ON(peer->t_delayopen, bgp_delayopen_timer, | |
1787 | peer->v_delayopen); | |
1788 | ||
1789 | if (bgp_debug_neighbor_events(peer)) | |
1790 | zlog_debug("%s [FSM] BGP OPEN message delayed for %d seconds", | |
1791 | peer->host, peer->delayopen); | |
1792 | ||
4da144f3 | 1793 | return BGP_FSM_SUCCESS; |
6c537a18 DS |
1794 | } |
1795 | ||
718e3744 | 1796 | /* TCP connect fail */ |
4da144f3 | 1797 | static enum bgp_fsm_state_progress bgp_connect_fail(struct peer *peer) |
718e3744 | 1798 | { |
af8496af | 1799 | if (peer_dynamic_neighbor_no_nsf(peer)) { |
d62a17ae | 1800 | if (bgp_debug_neighbor_events(peer)) |
31afff83 DA |
1801 | zlog_debug("%s (dynamic neighbor) deleted (%s)", |
1802 | peer->host, __func__); | |
d62a17ae | 1803 | peer_delete(peer); |
4da144f3 | 1804 | return BGP_FSM_FAILURE_AND_DELETE; |
d62a17ae | 1805 | } |
1806 | ||
8761cd6d DS |
1807 | /* |
1808 | * If we are doing nht for a peer that ls v6 LL based | |
1809 | * massage the event system to make things happy | |
1810 | */ | |
1811 | bgp_nht_interface_events(peer); | |
1812 | ||
4da144f3 | 1813 | return bgp_stop(peer); |
718e3744 | 1814 | } |
1815 | ||
1816 | /* This function is the first starting point of all BGP connection. It | |
6c537a18 DS |
1817 | * try to connect to remote peer with non-blocking IO. |
1818 | */ | |
4da144f3 | 1819 | enum bgp_fsm_state_progress bgp_start(struct peer *peer) |
718e3744 | 1820 | { |
d62a17ae | 1821 | int status; |
d62a17ae | 1822 | |
1823 | bgp_peer_conf_if_to_su_update(peer); | |
1824 | ||
1825 | if (peer->su.sa.sa_family == AF_UNSPEC) { | |
1826 | if (bgp_debug_neighbor_events(peer)) | |
1827 | zlog_debug( | |
1828 | "%s [FSM] Unable to get neighbor's IP address, waiting...", | |
1829 | peer->host); | |
3577f1c5 | 1830 | peer->last_reset = PEER_DOWN_NBR_ADDR; |
4da144f3 | 1831 | return BGP_FSM_FAILURE; |
d62a17ae | 1832 | } |
1833 | ||
1834 | if (BGP_PEER_START_SUPPRESSED(peer)) { | |
1835 | if (bgp_debug_neighbor_events(peer)) | |
e50f7cfd | 1836 | flog_err(EC_BGP_FSM, |
3efd0893 | 1837 | "%s [FSM] Trying to start suppressed peer - this is never supposed to happen!", |
1c50c1c0 | 1838 | peer->host); |
5597214c DA |
1839 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_RTT_SHUTDOWN)) |
1840 | peer->last_reset = PEER_DOWN_RTT_SHUTDOWN; | |
1841 | else if (CHECK_FLAG(peer->flags, PEER_FLAG_SHUTDOWN)) | |
07d1e5d9 | 1842 | peer->last_reset = PEER_DOWN_USER_SHUTDOWN; |
cb9196e7 DS |
1843 | else if (CHECK_FLAG(peer->bgp->flags, BGP_FLAG_SHUTDOWN)) |
1844 | peer->last_reset = PEER_DOWN_USER_SHUTDOWN; | |
07d1e5d9 DA |
1845 | else if (CHECK_FLAG(peer->sflags, PEER_STATUS_PREFIX_OVERFLOW)) |
1846 | peer->last_reset = PEER_DOWN_PFX_COUNT; | |
4da144f3 | 1847 | return BGP_FSM_FAILURE; |
d62a17ae | 1848 | } |
1849 | ||
1850 | /* Scrub some information that might be left over from a previous, | |
1851 | * session | |
1852 | */ | |
1853 | /* Connection information. */ | |
1854 | if (peer->su_local) { | |
1855 | sockunion_free(peer->su_local); | |
1856 | peer->su_local = NULL; | |
1857 | } | |
1858 | ||
1859 | if (peer->su_remote) { | |
1860 | sockunion_free(peer->su_remote); | |
1861 | peer->su_remote = NULL; | |
1862 | } | |
1863 | ||
1864 | /* Clear remote router-id. */ | |
975a328e | 1865 | peer->remote_id.s_addr = INADDR_ANY; |
d62a17ae | 1866 | |
1867 | /* Clear peer capability flag. */ | |
1868 | peer->cap = 0; | |
1869 | ||
1870 | /* If the peer is passive mode, force to move to Active mode. */ | |
1871 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE)) { | |
1872 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
4da144f3 | 1873 | return BGP_FSM_SUCCESS; |
d62a17ae | 1874 | } |
1875 | ||
2c1eba8e | 1876 | if (peer->bgp->vrf_id == VRF_UNKNOWN) { |
61cf4b37 | 1877 | if (bgp_debug_neighbor_events(peer)) |
af4c2728 | 1878 | flog_err( |
e50f7cfd | 1879 | EC_BGP_FSM, |
996c9314 LB |
1880 | "%s [FSM] In a VRF that is not initialised yet", |
1881 | peer->host); | |
3577f1c5 | 1882 | peer->last_reset = PEER_DOWN_VRF_UNINIT; |
4da144f3 | 1883 | return BGP_FSM_FAILURE; |
61cf4b37 PG |
1884 | } |
1885 | ||
e2d3a909 | 1886 | /* Register peer for NHT. If next hop is already resolved, proceed |
1887 | * with connection setup, else wait. | |
1888 | */ | |
1889 | if (!bgp_peer_reg_with_nht(peer)) { | |
c42eab4b DS |
1890 | if (bgp_zebra_num_connects()) { |
1891 | if (bgp_debug_neighbor_events(peer)) | |
6029afbc DS |
1892 | zlog_debug( |
1893 | "%s [FSM] Waiting for NHT, no path to neighbor present", | |
1894 | peer->host); | |
3577f1c5 | 1895 | peer->last_reset = PEER_DOWN_WAITING_NHT; |
c42eab4b | 1896 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); |
4da144f3 | 1897 | return BGP_FSM_SUCCESS; |
c42eab4b | 1898 | } |
718e3744 | 1899 | } |
d62a17ae | 1900 | |
424ab01d QY |
1901 | assert(!peer->t_write); |
1902 | assert(!peer->t_read); | |
1903 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); | |
1904 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); | |
d62a17ae | 1905 | status = bgp_connect(peer); |
1906 | ||
1907 | switch (status) { | |
1908 | case connect_error: | |
1909 | if (bgp_debug_neighbor_events(peer)) | |
1910 | zlog_debug("%s [FSM] Connect error", peer->host); | |
1911 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1912 | break; | |
1913 | case connect_success: | |
1914 | if (bgp_debug_neighbor_events(peer)) | |
1915 | zlog_debug( | |
1916 | "%s [FSM] Connect immediately success, fd %d", | |
1917 | peer->host, peer->fd); | |
6c537a18 | 1918 | |
d62a17ae | 1919 | BGP_EVENT_ADD(peer, TCP_connection_open); |
1920 | break; | |
1921 | case connect_in_progress: | |
1922 | /* To check nonblocking connect, we wait until socket is | |
1923 | readable or writable. */ | |
1924 | if (bgp_debug_neighbor_events(peer)) | |
1925 | zlog_debug( | |
1926 | "%s [FSM] Non blocking connect waiting result, fd %d", | |
1927 | peer->host, peer->fd); | |
1928 | if (peer->fd < 0) { | |
e50f7cfd | 1929 | flog_err(EC_BGP_FSM, |
a10c2872 | 1930 | "%s peer's fd is negative value %d", __func__, |
1c50c1c0 | 1931 | peer->fd); |
4da144f3 | 1932 | return BGP_FSM_FAILURE; |
d62a17ae | 1933 | } |
becedef6 | 1934 | /* |
387f984e QY |
1935 | * - when the socket becomes ready, poll() will signify POLLOUT |
1936 | * - if it fails to connect, poll() will signify POLLHUP | |
1937 | * - POLLHUP is handled as a 'read' event by thread.c | |
1938 | * | |
1939 | * therefore, we schedule both a read and a write event with | |
1940 | * bgp_connect_check() as the handler for each and cancel the | |
1941 | * unused event in that function. | |
becedef6 | 1942 | */ |
907a2395 DS |
1943 | event_add_read(bm->master, bgp_connect_check, peer, peer->fd, |
1944 | &peer->t_connect_check_r); | |
1945 | event_add_write(bm->master, bgp_connect_check, peer, peer->fd, | |
1946 | &peer->t_connect_check_w); | |
d62a17ae | 1947 | break; |
1948 | } | |
4da144f3 | 1949 | return BGP_FSM_SUCCESS; |
718e3744 | 1950 | } |
1951 | ||
1952 | /* Connect retry timer is expired when the peer status is Connect. */ | |
4da144f3 | 1953 | static enum bgp_fsm_state_progress bgp_reconnect(struct peer *peer) |
718e3744 | 1954 | { |
4da144f3 DS |
1955 | enum bgp_fsm_state_progress ret; |
1956 | ||
1957 | ret = bgp_stop(peer); | |
1958 | if (ret < BGP_FSM_SUCCESS) | |
1959 | return ret; | |
1ff9a340 | 1960 | |
8c48b3b6 | 1961 | /* Send graceful restart capabilty */ |
36235319 QY |
1962 | BGP_GR_ROUTER_DETECT_AND_SEND_CAPABILITY_TO_ZEBRA(peer->bgp, |
1963 | peer->bgp->peer); | |
8c48b3b6 | 1964 | |
4da144f3 | 1965 | return bgp_start(peer); |
718e3744 | 1966 | } |
1967 | ||
4da144f3 | 1968 | static enum bgp_fsm_state_progress bgp_fsm_open(struct peer *peer) |
718e3744 | 1969 | { |
6c537a18 DS |
1970 | /* If DelayOpen is active, we may still need to send an open message */ |
1971 | if ((peer->status == Connect) || (peer->status == Active)) | |
1972 | bgp_open_send(peer); | |
1973 | ||
d62a17ae | 1974 | /* Send keepalive and make keepalive timer */ |
1975 | bgp_keepalive_send(peer); | |
718e3744 | 1976 | |
4da144f3 | 1977 | return BGP_FSM_SUCCESS; |
718e3744 | 1978 | } |
1979 | ||
397b5bde LR |
1980 | /* FSM error, unexpected event. This is error of BGP connection. So cut the |
1981 | peer and change to Idle status. */ | |
4da144f3 | 1982 | static enum bgp_fsm_state_progress bgp_fsm_event_error(struct peer *peer) |
397b5bde | 1983 | { |
1c50c1c0 QY |
1984 | flog_err(EC_BGP_FSM, "%s [FSM] unexpected packet received in state %s", |
1985 | peer->host, lookup_msg(bgp_status_msg, peer->status, NULL)); | |
397b5bde | 1986 | |
3893aeee DA |
1987 | return bgp_stop_with_notify(peer, BGP_NOTIFY_FSM_ERR, |
1988 | bgp_fsm_error_subcode(peer->status)); | |
397b5bde LR |
1989 | } |
1990 | ||
718e3744 | 1991 | /* Hold timer expire. This is error of BGP connection. So cut the |
1992 | peer and change to Idle status. */ | |
4da144f3 | 1993 | static enum bgp_fsm_state_progress bgp_fsm_holdtime_expire(struct peer *peer) |
718e3744 | 1994 | { |
d62a17ae | 1995 | if (bgp_debug_neighbor_events(peer)) |
1996 | zlog_debug("%s [FSM] Hold timer expire", peer->host); | |
718e3744 | 1997 | |
20170775 DA |
1998 | /* RFC8538 updates RFC 4724 by defining an extension that permits |
1999 | * the Graceful Restart procedures to be performed when the BGP | |
2000 | * speaker receives a BGP NOTIFICATION message or the Hold Time expires. | |
2001 | */ | |
2002 | if (peer_established(peer) && | |
2003 | bgp_has_graceful_restart_notification(peer)) | |
2004 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_MODE)) | |
2005 | SET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
2006 | ||
d62a17ae | 2007 | return bgp_stop_with_notify(peer, BGP_NOTIFY_HOLD_ERR, 0); |
718e3744 | 2008 | } |
2009 | ||
6c537a18 | 2010 | /* RFC 4271 DelayOpenTimer_Expires event */ |
4da144f3 DS |
2011 | static enum bgp_fsm_state_progress |
2012 | bgp_fsm_delayopen_timer_expire(struct peer *peer) | |
6c537a18 DS |
2013 | { |
2014 | /* Stop the DelayOpenTimer */ | |
e16d030c | 2015 | EVENT_OFF(peer->t_delayopen); |
6c537a18 DS |
2016 | |
2017 | /* Send open message to peer */ | |
2018 | bgp_open_send(peer); | |
2019 | ||
2020 | /* Set the HoldTimer to a large value (4 minutes) */ | |
2021 | peer->v_holdtime = 245; | |
2022 | ||
4da144f3 | 2023 | return BGP_FSM_SUCCESS; |
6c537a18 DS |
2024 | } |
2025 | ||
f009ff26 | 2026 | /* Start the selection deferral timer thread for the specified AFI, SAFI */ |
2027 | static int bgp_start_deferral_timer(struct bgp *bgp, afi_t afi, safi_t safi, | |
36235319 | 2028 | struct graceful_restart_info *gr_info) |
f009ff26 | 2029 | { |
2030 | struct afi_safi_info *thread_info; | |
2031 | ||
2032 | /* If the deferral timer is active, then increment eor count */ | |
2033 | if (gr_info->t_select_deferral) { | |
2034 | gr_info->eor_required++; | |
2035 | return 0; | |
2036 | } | |
2037 | ||
2038 | /* Start the deferral timer when the first peer enabled for the graceful | |
2039 | * restart is established | |
2040 | */ | |
2041 | if (gr_info->eor_required == 0) { | |
2042 | thread_info = XMALLOC(MTYPE_TMP, sizeof(struct afi_safi_info)); | |
f009ff26 | 2043 | |
2044 | thread_info->afi = afi; | |
2045 | thread_info->safi = safi; | |
2046 | thread_info->bgp = bgp; | |
2047 | ||
907a2395 DS |
2048 | event_add_timer(bm->master, bgp_graceful_deferral_timer_expire, |
2049 | thread_info, bgp->select_defer_time, | |
2050 | &gr_info->t_select_deferral); | |
f009ff26 | 2051 | } |
f009ff26 | 2052 | gr_info->eor_required++; |
8c48b3b6 | 2053 | /* Send message to RIB indicating route update pending */ |
2054 | if (gr_info->af_enabled[afi][safi] == false) { | |
2055 | gr_info->af_enabled[afi][safi] = true; | |
2056 | /* Send message to RIB */ | |
115ccb9a | 2057 | bgp_zebra_update(bgp, afi, safi, |
8c48b3b6 | 2058 | ZEBRA_CLIENT_ROUTE_UPDATE_PENDING); |
2059 | } | |
f009ff26 | 2060 | if (BGP_DEBUG(update, UPDATE_OUT)) |
2061 | zlog_debug("Started the deferral timer for %s eor_required %d", | |
36235319 QY |
2062 | get_afi_safi_str(afi, safi, false), |
2063 | gr_info->eor_required); | |
f009ff26 | 2064 | return 0; |
2065 | } | |
2066 | ||
2067 | /* Update the graceful restart information for the specified AFI, SAFI */ | |
2068 | static int bgp_update_gr_info(struct peer *peer, afi_t afi, safi_t safi) | |
2069 | { | |
2070 | struct graceful_restart_info *gr_info; | |
2071 | struct bgp *bgp = peer->bgp; | |
2072 | int ret = 0; | |
2073 | ||
2074 | if ((afi < AFI_IP) || (afi >= AFI_MAX)) { | |
2075 | if (BGP_DEBUG(update, UPDATE_OUT)) | |
2076 | zlog_debug("%s : invalid afi %d", __func__, afi); | |
2077 | return -1; | |
2078 | } | |
2079 | ||
2080 | if ((safi < SAFI_UNICAST) || (safi > SAFI_MPLS_VPN)) { | |
2081 | if (BGP_DEBUG(update, UPDATE_OUT)) | |
2082 | zlog_debug("%s : invalid safi %d", __func__, safi); | |
2083 | return -1; | |
2084 | } | |
2085 | ||
2086 | /* Restarting router */ | |
36235319 QY |
2087 | if (BGP_PEER_GRACEFUL_RESTART_CAPABLE(peer) |
2088 | && BGP_PEER_RESTARTING_MODE(peer)) { | |
f009ff26 | 2089 | /* Check if the forwarding state is preserved */ |
892fedb6 | 2090 | if (CHECK_FLAG(bgp->flags, BGP_FLAG_GR_PRESERVE_FWD)) { |
f009ff26 | 2091 | gr_info = &(bgp->gr_info[afi][safi]); |
2092 | ret = bgp_start_deferral_timer(bgp, afi, safi, gr_info); | |
2093 | } | |
2094 | } | |
2ba1fe69 | 2095 | return ret; |
f009ff26 | 2096 | } |
2097 | ||
727c4f87 QY |
2098 | /** |
2099 | * Transition to Established state. | |
2100 | * | |
2101 | * Convert peer from stub to full fledged peer, set some timers, and generate | |
2102 | * initial updates. | |
2103 | */ | |
4da144f3 | 2104 | static enum bgp_fsm_state_progress bgp_establish(struct peer *peer) |
718e3744 | 2105 | { |
d62a17ae | 2106 | afi_t afi; |
2107 | safi_t safi; | |
2108 | int nsf_af_count = 0; | |
4da144f3 | 2109 | enum bgp_fsm_state_progress ret = BGP_FSM_SUCCESS; |
d62a17ae | 2110 | struct peer *other; |
f009ff26 | 2111 | int status; |
d62a17ae | 2112 | |
2113 | other = peer->doppelganger; | |
56b7d690 DS |
2114 | hash_release(peer->bgp->peerhash, peer); |
2115 | if (other) | |
2116 | hash_release(peer->bgp->peerhash, other); | |
2117 | ||
d62a17ae | 2118 | peer = peer_xfer_conn(peer); |
2119 | if (!peer) { | |
e50f7cfd | 2120 | flog_err(EC_BGP_CONNECT, "%%Neighbor failed in xfer_conn"); |
4da144f3 | 2121 | return BGP_FSM_FAILURE; |
93406d87 | 2122 | } |
93406d87 | 2123 | |
d62a17ae | 2124 | if (other == peer) |
4da144f3 | 2125 | ret = BGP_FSM_SUCCESS_STATE_TRANSFER; |
d62a17ae | 2126 | |
2127 | /* Reset capability open status flag. */ | |
2128 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN)) | |
2129 | SET_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN); | |
2130 | ||
2131 | /* Clear start timer value to default. */ | |
2132 | peer->v_start = BGP_INIT_START_TIMER; | |
2133 | ||
2134 | /* Increment established count. */ | |
2135 | peer->established++; | |
2136 | bgp_fsm_change_status(peer, Established); | |
2137 | ||
2138 | /* bgp log-neighbor-changes of neighbor Up */ | |
892fedb6 | 2139 | if (CHECK_FLAG(peer->bgp->flags, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { |
d62a17ae | 2140 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); |
f70c91dc | 2141 | zlog_info("%%ADJCHANGE: neighbor %pBP in vrf %s Up", peer, |
a7d91a8c DA |
2142 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) |
2143 | ? vrf->name | |
2144 | : VRF_DEFAULT_NAME) | |
2145 | : ""); | |
d62a17ae | 2146 | } |
2147 | /* assign update-group/subgroup */ | |
2148 | update_group_adjust_peer_afs(peer); | |
2149 | ||
2150 | /* graceful restart */ | |
2151 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
f009ff26 | 2152 | if (bgp_debug_neighbor_events(peer)) { |
2153 | if (BGP_PEER_RESTARTING_MODE(peer)) | |
f70c91dc | 2154 | zlog_debug("%pBP BGP_RESTARTING_MODE", peer); |
f009ff26 | 2155 | else if (BGP_PEER_HELPER_MODE(peer)) |
f70c91dc | 2156 | zlog_debug("%pBP BGP_HELPER_MODE", peer); |
f009ff26 | 2157 | } |
df8d723c DA |
2158 | |
2159 | FOREACH_AFI_SAFI_NSF (afi, safi) { | |
2160 | if (peer->afc_nego[afi][safi] && | |
2161 | CHECK_FLAG(peer->cap, PEER_CAP_RESTART_ADV) && | |
2162 | CHECK_FLAG(peer->af_cap[afi][safi], | |
2163 | PEER_CAP_RESTART_AF_RCV)) { | |
2164 | if (peer->nsf[afi][safi] && | |
2165 | !CHECK_FLAG(peer->af_cap[afi][safi], | |
2166 | PEER_CAP_RESTART_AF_PRESERVE_RCV)) | |
2167 | bgp_clear_stale_route(peer, afi, safi); | |
2168 | ||
2169 | peer->nsf[afi][safi] = 1; | |
2170 | nsf_af_count++; | |
2171 | } else { | |
2172 | if (peer->nsf[afi][safi]) | |
2173 | bgp_clear_stale_route(peer, afi, safi); | |
2174 | peer->nsf[afi][safi] = 0; | |
2175 | } | |
2176 | /* Update the graceful restart information */ | |
2177 | if (peer->afc_nego[afi][safi]) { | |
2178 | if (!BGP_SELECT_DEFER_DISABLE(peer->bgp)) { | |
2179 | status = bgp_update_gr_info(peer, afi, safi); | |
2180 | if (status < 0) | |
2181 | zlog_err( | |
2182 | "Error in updating graceful restart for %s", | |
2183 | get_afi_safi_str(afi, safi, | |
2184 | false)); | |
d62a17ae | 2185 | } else { |
df8d723c DA |
2186 | if (BGP_PEER_GRACEFUL_RESTART_CAPABLE(peer) && |
2187 | BGP_PEER_RESTARTING_MODE(peer) && | |
2188 | CHECK_FLAG(peer->bgp->flags, | |
2189 | BGP_FLAG_GR_PRESERVE_FWD)) | |
2190 | peer->bgp->gr_info[afi][safi] | |
2191 | .eor_required++; | |
f009ff26 | 2192 | } |
d62a17ae | 2193 | } |
df8d723c | 2194 | } |
d62a17ae | 2195 | |
77b34214 NT |
2196 | if (!CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV)) { |
2197 | if ((bgp_peer_gr_mode_get(peer) == PEER_GR) | |
2198 | || ((bgp_peer_gr_mode_get(peer) == PEER_GLOBAL_INHERIT) | |
2199 | && (bgp_global_gr_mode_get(peer->bgp) == GLOBAL_GR))) { | |
2200 | FOREACH_AFI_SAFI (afi, safi) | |
2201 | /* Send route processing complete | |
2202 | message to RIB */ | |
2203 | bgp_zebra_update( | |
115ccb9a | 2204 | peer->bgp, afi, safi, |
77b34214 NT |
2205 | ZEBRA_CLIENT_ROUTE_UPDATE_COMPLETE); |
2206 | } | |
2207 | } else { | |
2208 | /* Peer sends R-bit. In this case, we need to send | |
2209 | * ZEBRA_CLIENT_ROUTE_UPDATE_COMPLETE to Zebra. */ | |
eea685b6 DA |
2210 | if (CHECK_FLAG(peer->cap, |
2211 | PEER_CAP_GRACEFUL_RESTART_R_BIT_RCV)) { | |
77b34214 NT |
2212 | FOREACH_AFI_SAFI (afi, safi) |
2213 | /* Send route processing complete | |
2214 | message to RIB */ | |
2215 | bgp_zebra_update( | |
115ccb9a | 2216 | peer->bgp, afi, safi, |
77b34214 NT |
2217 | ZEBRA_CLIENT_ROUTE_UPDATE_COMPLETE); |
2218 | } | |
2219 | } | |
2220 | ||
794b37d5 | 2221 | peer->nsf_af_count = nsf_af_count; |
2222 | ||
d62a17ae | 2223 | if (nsf_af_count) |
2224 | SET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
2225 | else { | |
2226 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
2227 | if (peer->t_gr_stale) { | |
e16d030c | 2228 | EVENT_OFF(peer->t_gr_stale); |
d62a17ae | 2229 | if (bgp_debug_neighbor_events(peer)) |
2230 | zlog_debug( | |
f70c91dc DA |
2231 | "%pBP graceful restart stalepath timer stopped", |
2232 | peer); | |
d62a17ae | 2233 | } |
2234 | } | |
93406d87 | 2235 | |
d62a17ae | 2236 | if (peer->t_gr_restart) { |
e16d030c | 2237 | EVENT_OFF(peer->t_gr_restart); |
d62a17ae | 2238 | if (bgp_debug_neighbor_events(peer)) |
f70c91dc | 2239 | zlog_debug("%pBP graceful restart timer stopped", peer); |
d62a17ae | 2240 | } |
718e3744 | 2241 | |
9eb217ff QY |
2242 | /* Reset uptime, turn on keepalives, send current table. */ |
2243 | if (!peer->v_holdtime) | |
2244 | bgp_keepalives_on(peer); | |
2245 | ||
083ec940 | 2246 | peer->uptime = monotime(NULL); |
d62a17ae | 2247 | |
0d4532cd DA |
2248 | /* Send route-refresh when ORF is enabled. |
2249 | * Stop Long-lived Graceful Restart timers. | |
2250 | */ | |
05c7a1cc | 2251 | FOREACH_AFI_SAFI (afi, safi) { |
0d4532cd | 2252 | if (peer->t_llgr_stale[afi][safi]) { |
e16d030c | 2253 | EVENT_OFF(peer->t_llgr_stale[afi][safi]); |
0d4532cd DA |
2254 | if (bgp_debug_neighbor_events(peer)) |
2255 | zlog_debug( | |
f70c91dc DA |
2256 | "%pBP Long-lived stale timer stopped for afi/safi: %d/%d", |
2257 | peer, afi, safi); | |
0d4532cd DA |
2258 | } |
2259 | ||
05c7a1cc QY |
2260 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
2261 | PEER_CAP_ORF_PREFIX_SM_ADV)) { | |
d62a17ae | 2262 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc | 2263 | PEER_CAP_ORF_PREFIX_RM_RCV)) |
9af52ccf DA |
2264 | bgp_route_refresh_send( |
2265 | peer, afi, safi, ORF_TYPE_PREFIX, | |
2266 | REFRESH_IMMEDIATE, 0, | |
2267 | BGP_ROUTE_REFRESH_NORMAL); | |
05c7a1cc QY |
2268 | else if (CHECK_FLAG(peer->af_cap[afi][safi], |
2269 | PEER_CAP_ORF_PREFIX_RM_OLD_RCV)) | |
9af52ccf DA |
2270 | bgp_route_refresh_send( |
2271 | peer, afi, safi, ORF_TYPE_PREFIX_OLD, | |
2272 | REFRESH_IMMEDIATE, 0, | |
2273 | BGP_ROUTE_REFRESH_NORMAL); | |
05c7a1cc QY |
2274 | } |
2275 | } | |
d62a17ae | 2276 | |
2277 | /* First update is deferred until ORF or ROUTE-REFRESH is received */ | |
05c7a1cc QY |
2278 | FOREACH_AFI_SAFI (afi, safi) { |
2279 | if (CHECK_FLAG(peer->af_cap[afi][safi], | |
2280 | PEER_CAP_ORF_PREFIX_RM_ADV)) | |
d62a17ae | 2281 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc QY |
2282 | PEER_CAP_ORF_PREFIX_SM_RCV) |
2283 | || CHECK_FLAG(peer->af_cap[afi][safi], | |
2284 | PEER_CAP_ORF_PREFIX_SM_OLD_RCV)) | |
2285 | SET_FLAG(peer->af_sflags[afi][safi], | |
2286 | PEER_STATUS_ORF_WAIT_REFRESH); | |
2287 | } | |
d62a17ae | 2288 | |
2289 | bgp_announce_peer(peer); | |
2290 | ||
2291 | /* Start the route advertisement timer to send updates to the peer - if | |
2292 | * BGP | |
2293 | * is not in read-only mode. If it is, the timer will be started at the | |
2294 | * end | |
2295 | * of read-only mode. | |
2296 | */ | |
2297 | if (!bgp_update_delay_active(peer->bgp)) { | |
e16d030c | 2298 | EVENT_OFF(peer->t_routeadv); |
d62a17ae | 2299 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); |
2300 | } | |
718e3744 | 2301 | |
d62a17ae | 2302 | if (peer->doppelganger && (peer->doppelganger->status != Deleted)) { |
2303 | if (bgp_debug_neighbor_events(peer)) | |
2304 | zlog_debug( | |
2305 | "[Event] Deleting stub connection for peer %s", | |
2306 | peer->host); | |
2307 | ||
2308 | if (peer->doppelganger->status > Active) | |
2309 | bgp_notify_send(peer->doppelganger, BGP_NOTIFY_CEASE, | |
2310 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
2311 | else | |
2312 | peer_delete(peer->doppelganger); | |
718e3744 | 2313 | } |
2314 | ||
19bd3dff DS |
2315 | /* |
2316 | * If we are replacing the old peer for a doppelganger | |
2317 | * then switch it around in the bgp->peerhash | |
2318 | * the doppelgangers su and this peer's su are the same | |
2319 | * so the hash_release is the same for either. | |
2320 | */ | |
8e3aae66 | 2321 | (void)hash_get(peer->bgp->peerhash, peer, hash_alloc_intern); |
19bd3dff | 2322 | |
21bfce98 RZ |
2323 | /* Start BFD peer if not already running. */ |
2324 | if (peer->bfd_config) | |
2325 | bgp_peer_bfd_update_source(peer); | |
2326 | ||
d62a17ae | 2327 | return ret; |
718e3744 | 2328 | } |
2329 | ||
2330 | /* Keepalive packet is received. */ | |
4da144f3 | 2331 | static enum bgp_fsm_state_progress bgp_fsm_keepalive(struct peer *peer) |
718e3744 | 2332 | { |
e16d030c | 2333 | EVENT_OFF(peer->t_holdtime); |
4da144f3 | 2334 | return BGP_FSM_SUCCESS; |
718e3744 | 2335 | } |
2336 | ||
2337 | /* Update packet is received. */ | |
4da144f3 | 2338 | static enum bgp_fsm_state_progress bgp_fsm_update(struct peer *peer) |
718e3744 | 2339 | { |
e16d030c | 2340 | EVENT_OFF(peer->t_holdtime); |
4da144f3 | 2341 | return BGP_FSM_SUCCESS; |
718e3744 | 2342 | } |
2343 | ||
2344 | /* This is empty event. */ | |
4da144f3 | 2345 | static enum bgp_fsm_state_progress bgp_ignore(struct peer *peer) |
718e3744 | 2346 | { |
af4c2728 | 2347 | flog_err( |
e50f7cfd | 2348 | EC_BGP_FSM, |
d62a17ae | 2349 | "%s [FSM] Ignoring event %s in state %s, prior events %s, %s, fd %d", |
2350 | peer->host, bgp_event_str[peer->cur_event], | |
2351 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
2352 | bgp_event_str[peer->last_event], | |
2353 | bgp_event_str[peer->last_major_event], peer->fd); | |
4da144f3 | 2354 | return BGP_FSM_SUCCESS; |
718e3744 | 2355 | } |
6b0655a2 | 2356 | |
6403814c | 2357 | /* This is to handle unexpected events.. */ |
4da144f3 | 2358 | static enum bgp_fsm_state_progress bgp_fsm_exception(struct peer *peer) |
6403814c | 2359 | { |
af4c2728 | 2360 | flog_err( |
e50f7cfd | 2361 | EC_BGP_FSM, |
d62a17ae | 2362 | "%s [FSM] Unexpected event %s in state %s, prior events %s, %s, fd %d", |
2363 | peer->host, bgp_event_str[peer->cur_event], | |
2364 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
2365 | bgp_event_str[peer->last_event], | |
2366 | bgp_event_str[peer->last_major_event], peer->fd); | |
4da144f3 | 2367 | return bgp_stop(peer); |
6403814c DS |
2368 | } |
2369 | ||
f8dcd38d | 2370 | void bgp_fsm_nht_update(struct peer *peer, bool has_valid_nexthops) |
fc9a856f | 2371 | { |
d62a17ae | 2372 | if (!peer) |
2373 | return; | |
2374 | ||
2375 | switch (peer->status) { | |
2376 | case Idle: | |
f8dcd38d | 2377 | if (has_valid_nexthops) |
d62a17ae | 2378 | BGP_EVENT_ADD(peer, BGP_Start); |
2379 | break; | |
2380 | case Connect: | |
f8dcd38d | 2381 | if (!has_valid_nexthops) { |
e16d030c | 2382 | EVENT_OFF(peer->t_connect); |
d62a17ae | 2383 | BGP_EVENT_ADD(peer, TCP_fatal_error); |
2384 | } | |
2385 | break; | |
2386 | case Active: | |
f8dcd38d | 2387 | if (has_valid_nexthops) { |
e16d030c | 2388 | EVENT_OFF(peer->t_connect); |
d62a17ae | 2389 | BGP_EVENT_ADD(peer, ConnectRetry_timer_expired); |
2390 | } | |
2391 | break; | |
2392 | case OpenSent: | |
2393 | case OpenConfirm: | |
2394 | case Established: | |
f8dcd38d | 2395 | if (!has_valid_nexthops |
f852eb98 PG |
2396 | && (peer->gtsm_hops == BGP_GTSM_HOPS_CONNECTED |
2397 | || peer->bgp->fast_convergence)) | |
d62a17ae | 2398 | BGP_EVENT_ADD(peer, TCP_fatal_error); |
2399 | case Clearing: | |
2400 | case Deleted: | |
58cf0823 | 2401 | case BGP_STATUS_MAX: |
d62a17ae | 2402 | break; |
fc9a856f | 2403 | } |
fc9a856f DS |
2404 | } |
2405 | ||
718e3744 | 2406 | /* Finite State Machine structure */ |
fda1d3e0 | 2407 | static const struct { |
4da144f3 | 2408 | enum bgp_fsm_state_progress (*func)(struct peer *); |
8398b5d5 | 2409 | enum bgp_fsm_status next_state; |
d62a17ae | 2410 | } FSM[BGP_STATUS_MAX - 1][BGP_EVENTS_MAX - 1] = { |
2411 | { | |
2412 | /* Idle state: In Idle state, all events other than BGP_Start is | |
2413 | ignored. With BGP_Start event, finite state machine calls | |
2414 | bgp_start(). */ | |
2415 | {bgp_start, Connect}, /* BGP_Start */ | |
2416 | {bgp_stop, Idle}, /* BGP_Stop */ | |
2417 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
6c537a18 | 2418 | {bgp_stop, Idle}, /* TCP_connection_open_w_delay */ |
d62a17ae | 2419 | {bgp_stop, Idle}, /* TCP_connection_closed */ |
2420 | {bgp_ignore, Idle}, /* TCP_connection_open_failed */ | |
2421 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
2422 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ | |
2423 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
2424 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
6c537a18 | 2425 | {bgp_ignore, Idle}, /* DelayOpen_timer_expired */ |
d62a17ae | 2426 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ |
2427 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
2428 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
2429 | {bgp_ignore, Idle}, /* Receive_NOTIFICATION_message */ | |
2430 | {bgp_ignore, Idle}, /* Clearing_Completed */ | |
2431 | }, | |
2432 | { | |
2433 | /* Connect */ | |
2434 | {bgp_ignore, Connect}, /* BGP_Start */ | |
2435 | {bgp_stop, Idle}, /* BGP_Stop */ | |
2436 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
6c537a18 DS |
2437 | {bgp_connect_success_w_delayopen, |
2438 | Connect}, /* TCP_connection_open_w_delay */ | |
4da144f3 | 2439 | {bgp_stop, Idle}, /* TCP_connection_closed */ |
d62a17ae | 2440 | {bgp_connect_fail, Active}, /* TCP_connection_open_failed */ |
2441 | {bgp_connect_fail, Idle}, /* TCP_fatal_error */ | |
2442 | {bgp_reconnect, Connect}, /* ConnectRetry_timer_expired */ | |
4da144f3 DS |
2443 | {bgp_fsm_exception, Idle}, /* Hold_Timer_expired */ |
2444 | {bgp_fsm_exception, Idle}, /* KeepAlive_timer_expired */ | |
6c537a18 DS |
2445 | {bgp_fsm_delayopen_timer_expire, |
2446 | OpenSent}, /* DelayOpen_timer_expired */ | |
2447 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ | |
4da144f3 DS |
2448 | {bgp_fsm_exception, Idle}, /* Receive_KEEPALIVE_message */ |
2449 | {bgp_fsm_exception, Idle}, /* Receive_UPDATE_message */ | |
2450 | {bgp_stop, Idle}, /* Receive_NOTIFICATION_message */ | |
2451 | {bgp_fsm_exception, Idle}, /* Clearing_Completed */ | |
d62a17ae | 2452 | }, |
2453 | { | |
2454 | /* Active, */ | |
2455 | {bgp_ignore, Active}, /* BGP_Start */ | |
2456 | {bgp_stop, Idle}, /* BGP_Stop */ | |
2457 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
6c537a18 | 2458 | {bgp_connect_success_w_delayopen, |
4da144f3 DS |
2459 | Active}, /* TCP_connection_open_w_delay */ |
2460 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
2461 | {bgp_ignore, Active}, /* TCP_connection_open_failed */ | |
2462 | {bgp_fsm_exception, Idle}, /* TCP_fatal_error */ | |
2463 | {bgp_start, Connect}, /* ConnectRetry_timer_expired */ | |
2464 | {bgp_fsm_exception, Idle}, /* Hold_Timer_expired */ | |
2465 | {bgp_fsm_exception, Idle}, /* KeepAlive_timer_expired */ | |
6c537a18 DS |
2466 | {bgp_fsm_delayopen_timer_expire, |
2467 | OpenSent}, /* DelayOpen_timer_expired */ | |
2468 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ | |
4da144f3 DS |
2469 | {bgp_fsm_exception, Idle}, /* Receive_KEEPALIVE_message */ |
2470 | {bgp_fsm_exception, Idle}, /* Receive_UPDATE_message */ | |
2471 | {bgp_fsm_exception, Idle}, /* Receive_NOTIFICATION_message */ | |
2472 | {bgp_fsm_exception, Idle}, /* Clearing_Completed */ | |
d62a17ae | 2473 | }, |
2474 | { | |
2475 | /* OpenSent, */ | |
4da144f3 DS |
2476 | {bgp_ignore, OpenSent}, /* BGP_Start */ |
2477 | {bgp_stop, Idle}, /* BGP_Stop */ | |
2478 | {bgp_stop, Active}, /* TCP_connection_open */ | |
2479 | {bgp_fsm_exception, Idle}, /* TCP_connection_open_w_delay */ | |
2480 | {bgp_stop, Active}, /* TCP_connection_closed */ | |
2481 | {bgp_stop, Active}, /* TCP_connection_open_failed */ | |
2482 | {bgp_stop, Active}, /* TCP_fatal_error */ | |
2483 | {bgp_fsm_exception, Idle}, /* ConnectRetry_timer_expired */ | |
d62a17ae | 2484 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ |
4da144f3 DS |
2485 | {bgp_fsm_exception, Idle}, /* KeepAlive_timer_expired */ |
2486 | {bgp_fsm_exception, Idle}, /* DelayOpen_timer_expired */ | |
d62a17ae | 2487 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ |
2488 | {bgp_fsm_event_error, Idle}, /* Receive_KEEPALIVE_message */ | |
2489 | {bgp_fsm_event_error, Idle}, /* Receive_UPDATE_message */ | |
53b4aaec | 2490 | {bgp_fsm_event_error, Idle}, /* Receive_NOTIFICATION_message */ |
4da144f3 | 2491 | {bgp_fsm_exception, Idle}, /* Clearing_Completed */ |
d62a17ae | 2492 | }, |
2493 | { | |
2494 | /* OpenConfirm, */ | |
2495 | {bgp_ignore, OpenConfirm}, /* BGP_Start */ | |
4da144f3 DS |
2496 | {bgp_stop, Idle}, /* BGP_Stop */ |
2497 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
2498 | {bgp_fsm_exception, Idle}, /* TCP_connection_open_w_delay */ | |
2499 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
2500 | {bgp_stop, Idle}, /* TCP_connection_open_failed */ | |
2501 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
2502 | {bgp_fsm_exception, Idle}, /* ConnectRetry_timer_expired */ | |
d62a17ae | 2503 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ |
2504 | {bgp_ignore, OpenConfirm}, /* KeepAlive_timer_expired */ | |
4da144f3 DS |
2505 | {bgp_fsm_exception, Idle}, /* DelayOpen_timer_expired */ |
2506 | {bgp_fsm_exception, Idle}, /* Receive_OPEN_message */ | |
d62a17ae | 2507 | {bgp_establish, Established}, /* Receive_KEEPALIVE_message */ |
4da144f3 | 2508 | {bgp_fsm_exception, Idle}, /* Receive_UPDATE_message */ |
d62a17ae | 2509 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ |
4da144f3 | 2510 | {bgp_fsm_exception, Idle}, /* Clearing_Completed */ |
d62a17ae | 2511 | }, |
2512 | { | |
2513 | /* Established, */ | |
2514 | {bgp_ignore, Established}, /* BGP_Start */ | |
4da144f3 DS |
2515 | {bgp_stop, Clearing}, /* BGP_Stop */ |
2516 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
2517 | {bgp_fsm_exception, Idle}, /* TCP_connection_open_w_delay */ | |
2518 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
2519 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
2520 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
2521 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
d62a17ae | 2522 | {bgp_fsm_holdtime_expire, Clearing}, /* Hold_Timer_expired */ |
03014d48 | 2523 | {bgp_ignore, Established}, /* KeepAlive_timer_expired */ |
4da144f3 DS |
2524 | {bgp_fsm_exception, Idle}, /* DelayOpen_timer_expired */ |
2525 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
d62a17ae | 2526 | {bgp_fsm_keepalive, |
2527 | Established}, /* Receive_KEEPALIVE_message */ | |
2528 | {bgp_fsm_update, Established}, /* Receive_UPDATE_message */ | |
2529 | {bgp_stop_with_error, | |
4da144f3 DS |
2530 | Clearing}, /* Receive_NOTIFICATION_message */ |
2531 | {bgp_fsm_exception, Idle}, /* Clearing_Completed */ | |
d62a17ae | 2532 | }, |
2533 | { | |
2534 | /* Clearing, */ | |
2535 | {bgp_ignore, Clearing}, /* BGP_Start */ | |
4da144f3 DS |
2536 | {bgp_stop, Clearing}, /* BGP_Stop */ |
2537 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
2538 | {bgp_stop, Clearing}, /* TCP_connection_open_w_delay */ | |
2539 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
2540 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
2541 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
2542 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
2543 | {bgp_stop, Clearing}, /* Hold_Timer_expired */ | |
2544 | {bgp_stop, Clearing}, /* KeepAlive_timer_expired */ | |
2545 | {bgp_stop, Clearing}, /* DelayOpen_timer_expired */ | |
2546 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
2547 | {bgp_stop, Clearing}, /* Receive_KEEPALIVE_message */ | |
2548 | {bgp_stop, Clearing}, /* Receive_UPDATE_message */ | |
2549 | {bgp_stop, Clearing}, /* Receive_NOTIFICATION_message */ | |
d62a17ae | 2550 | {bgp_clearing_completed, Idle}, /* Clearing_Completed */ |
2551 | }, | |
2552 | { | |
2553 | /* Deleted, */ | |
2554 | {bgp_ignore, Deleted}, /* BGP_Start */ | |
2555 | {bgp_ignore, Deleted}, /* BGP_Stop */ | |
2556 | {bgp_ignore, Deleted}, /* TCP_connection_open */ | |
6c537a18 | 2557 | {bgp_ignore, Deleted}, /* TCP_connection_open_w_delay */ |
d62a17ae | 2558 | {bgp_ignore, Deleted}, /* TCP_connection_closed */ |
2559 | {bgp_ignore, Deleted}, /* TCP_connection_open_failed */ | |
2560 | {bgp_ignore, Deleted}, /* TCP_fatal_error */ | |
2561 | {bgp_ignore, Deleted}, /* ConnectRetry_timer_expired */ | |
2562 | {bgp_ignore, Deleted}, /* Hold_Timer_expired */ | |
2563 | {bgp_ignore, Deleted}, /* KeepAlive_timer_expired */ | |
6c537a18 | 2564 | {bgp_ignore, Deleted}, /* DelayOpen_timer_expired */ |
d62a17ae | 2565 | {bgp_ignore, Deleted}, /* Receive_OPEN_message */ |
2566 | {bgp_ignore, Deleted}, /* Receive_KEEPALIVE_message */ | |
2567 | {bgp_ignore, Deleted}, /* Receive_UPDATE_message */ | |
2568 | {bgp_ignore, Deleted}, /* Receive_NOTIFICATION_message */ | |
2569 | {bgp_ignore, Deleted}, /* Clearing_Completed */ | |
2570 | }, | |
718e3744 | 2571 | }; |
2572 | ||
718e3744 | 2573 | /* Execute event process. */ |
e6685141 | 2574 | void bgp_event(struct event *thread) |
718e3744 | 2575 | { |
d1060698 | 2576 | enum bgp_fsm_events event; |
d62a17ae | 2577 | struct peer *peer; |
718e3744 | 2578 | |
e16d030c DS |
2579 | peer = EVENT_ARG(thread); |
2580 | event = EVENT_VAL(thread); | |
718e3744 | 2581 | |
69ef3f31 | 2582 | peer_lock(peer); |
cc9f21da | 2583 | bgp_event_update(peer, event); |
69ef3f31 | 2584 | peer_unlock(peer); |
1ff9a340 DS |
2585 | } |
2586 | ||
d1060698 | 2587 | int bgp_event_update(struct peer *peer, enum bgp_fsm_events event) |
1ff9a340 | 2588 | { |
8398b5d5 | 2589 | enum bgp_fsm_status next; |
4da144f3 | 2590 | enum bgp_fsm_state_progress ret = 0; |
d62a17ae | 2591 | struct peer *other; |
2592 | int passive_conn = 0; | |
2593 | int dyn_nbr; | |
2594 | ||
d8151687 QY |
2595 | /* default return code */ |
2596 | ret = FSM_PEER_NOOP; | |
2597 | ||
d62a17ae | 2598 | other = peer->doppelganger; |
2599 | passive_conn = | |
2600 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) ? 1 : 0; | |
2601 | dyn_nbr = peer_dynamic_neighbor(peer); | |
2602 | ||
2603 | /* Logging this event. */ | |
2604 | next = FSM[peer->status - 1][event - 1].next_state; | |
2605 | ||
2606 | if (bgp_debug_neighbor_events(peer) && peer->status != next) | |
2607 | zlog_debug("%s [FSM] %s (%s->%s), fd %d", peer->host, | |
2608 | bgp_event_str[event], | |
2609 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
2610 | lookup_msg(bgp_status_msg, next, NULL), peer->fd); | |
2611 | ||
2612 | peer->last_event = peer->cur_event; | |
2613 | peer->cur_event = event; | |
2614 | ||
2615 | /* Call function. */ | |
2616 | if (FSM[peer->status - 1][event - 1].func) | |
2617 | ret = (*(FSM[peer->status - 1][event - 1].func))(peer); | |
2618 | ||
4da144f3 DS |
2619 | if (ret >= BGP_FSM_SUCCESS) { |
2620 | if (ret == BGP_FSM_SUCCESS_STATE_TRANSFER && | |
2621 | next == Established) { | |
d62a17ae | 2622 | /* The case when doppelganger swap accurred in |
2623 | bgp_establish. | |
2624 | Update the peer pointer accordingly */ | |
d8151687 | 2625 | ret = FSM_PEER_TRANSFERRED; |
d62a17ae | 2626 | peer = other; |
2627 | } | |
2628 | ||
2629 | /* If status is changed. */ | |
d8151687 | 2630 | if (next != peer->status) { |
d62a17ae | 2631 | bgp_fsm_change_status(peer, next); |
2632 | ||
becedef6 QY |
2633 | /* |
2634 | * If we're going to ESTABLISHED then we executed a | |
2635 | * peer transfer. In this case we can either return | |
2636 | * FSM_PEER_TRANSITIONED or FSM_PEER_TRANSFERRED. | |
2637 | * Opting for TRANSFERRED since transfer implies | |
2638 | * session establishment. | |
2639 | */ | |
d8151687 QY |
2640 | if (ret != FSM_PEER_TRANSFERRED) |
2641 | ret = FSM_PEER_TRANSITIONED; | |
2642 | } | |
2643 | ||
d62a17ae | 2644 | /* Make sure timer is set. */ |
2645 | bgp_timer_set(peer); | |
2646 | ||
bea01226 | 2647 | } else { |
becedef6 QY |
2648 | /* |
2649 | * If we got a return value of -1, that means there was an | |
2650 | * error, restart the FSM. Since bgp_stop() was called on the | |
2651 | * peer. only a few fields are safe to access here. In any case | |
2652 | * we need to indicate that the peer was stopped in the return | |
2653 | * code. | |
2654 | */ | |
4da144f3 DS |
2655 | if (!dyn_nbr && !passive_conn && peer->bgp && |
2656 | ret != BGP_FSM_FAILURE_AND_DELETE) { | |
af4c2728 | 2657 | flog_err( |
e50f7cfd | 2658 | EC_BGP_FSM, |
3efd0893 | 2659 | "%s [FSM] Failure handling event %s in state %s, prior events %s, %s, fd %d", |
bea01226 QY |
2660 | peer->host, bgp_event_str[peer->cur_event], |
2661 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
2662 | bgp_event_str[peer->last_event], | |
2663 | bgp_event_str[peer->last_major_event], | |
2664 | peer->fd); | |
2665 | bgp_stop(peer); | |
2666 | bgp_fsm_change_status(peer, Idle); | |
2667 | bgp_timer_set(peer); | |
2668 | } | |
2669 | ret = FSM_PEER_STOPPED; | |
d62a17ae | 2670 | } |
bea01226 | 2671 | |
d62a17ae | 2672 | return ret; |
718e3744 | 2673 | } |
794b37d5 | 2674 | /* BGP GR Code */ |
2675 | ||
2676 | int bgp_gr_lookup_n_update_all_peer(struct bgp *bgp, | |
36235319 QY |
2677 | enum global_mode global_new_state, |
2678 | enum global_mode global_old_state) | |
794b37d5 | 2679 | { |
2680 | struct peer *peer = {0}; | |
2681 | struct listnode *node = {0}; | |
2682 | struct listnode *nnode = {0}; | |
36235319 | 2683 | enum peer_mode peer_old_state = PEER_INVALID; |
794b37d5 | 2684 | |
2685 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) { | |
2686 | ||
2687 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
36235319 QY |
2688 | zlog_debug("%s [BGP_GR] Peer: (%s) :", __func__, |
2689 | peer->host); | |
794b37d5 | 2690 | |
2691 | peer_old_state = bgp_peer_gr_mode_get(peer); | |
2692 | ||
2693 | if (peer_old_state == PEER_GLOBAL_INHERIT) { | |
2694 | ||
36235319 QY |
2695 | /* |
2696 | *Reset only these peers and send a | |
2697 | *new open message with the change capabilities. | |
2698 | *Considering the mode to be "global_new_state" and | |
2699 | *do all operation accordingly | |
2700 | */ | |
794b37d5 | 2701 | |
2702 | switch (global_new_state) { | |
794b37d5 | 2703 | case GLOBAL_HELPER: |
794b37d5 | 2704 | BGP_PEER_GR_HELPER_ENABLE(peer); |
2705 | break; | |
2706 | case GLOBAL_GR: | |
794b37d5 | 2707 | BGP_PEER_GR_ENABLE(peer); |
2708 | break; | |
2709 | case GLOBAL_DISABLE: | |
794b37d5 | 2710 | BGP_PEER_GR_DISABLE(peer); |
2711 | break; | |
2712 | case GLOBAL_INVALID: | |
36235319 QY |
2713 | zlog_debug("%s [BGP_GR] GLOBAL_INVALID", |
2714 | __func__); | |
794b37d5 | 2715 | return BGP_ERR_GR_OPERATION_FAILED; |
794b37d5 | 2716 | } |
2717 | } | |
2718 | } | |
2719 | ||
2720 | bgp->global_gr_present_state = global_new_state; | |
2721 | ||
794b37d5 | 2722 | return BGP_GR_SUCCESS; |
2723 | } | |
2724 | ||
2ba1fe69 | 2725 | int bgp_gr_update_all(struct bgp *bgp, int global_gr_cmd) |
794b37d5 | 2726 | { |
2727 | enum global_mode global_new_state = GLOBAL_INVALID; | |
2728 | enum global_mode global_old_state = GLOBAL_INVALID; | |
2729 | ||
2730 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
36235319 QY |
2731 | zlog_debug("%s [BGP_GR]START: global_gr_cmd :%s:", __func__, |
2732 | print_global_gr_cmd(global_gr_cmd)); | |
794b37d5 | 2733 | |
2734 | global_old_state = bgp_global_gr_mode_get(bgp); | |
2735 | ||
2ba1fe69 | 2736 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
36235319 QY |
2737 | zlog_debug("[BGP_GR] global_old_gr_state :%s:", |
2738 | print_global_gr_mode(global_old_state)); | |
794b37d5 | 2739 | |
2ba1fe69 | 2740 | if (global_old_state != GLOBAL_INVALID) { |
794b37d5 | 2741 | global_new_state = |
2ba1fe69 | 2742 | bgp->GLOBAL_GR_FSM[global_old_state][global_gr_cmd]; |
2743 | ||
2744 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
36235319 QY |
2745 | zlog_debug("[BGP_GR] global_new_gr_state :%s:", |
2746 | print_global_gr_mode(global_new_state)); | |
794b37d5 | 2747 | } else { |
36235319 QY |
2748 | zlog_err("%s [BGP_GR] global_old_state == GLOBAL_INVALID", |
2749 | __func__); | |
794b37d5 | 2750 | return BGP_ERR_GR_OPERATION_FAILED; |
2751 | } | |
2752 | ||
2753 | if (global_new_state == GLOBAL_INVALID) { | |
36235319 QY |
2754 | zlog_err("%s [BGP_GR] global_new_state == GLOBAL_INVALID", |
2755 | __func__); | |
794b37d5 | 2756 | return BGP_ERR_GR_INVALID_CMD; |
2757 | } | |
2758 | if (global_new_state == global_old_state) { | |
2759 | /* Trace msg */ | |
2ba1fe69 | 2760 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
2761 | zlog_debug( | |
36235319 QY |
2762 | "%s [BGP_GR] global_new_state == global_old_state :%s", |
2763 | __func__, | |
2764 | print_global_gr_mode(global_new_state)); | |
794b37d5 | 2765 | return BGP_GR_NO_OPERATION; |
2766 | } | |
2767 | ||
36235319 QY |
2768 | return bgp_gr_lookup_n_update_all_peer(bgp, global_new_state, |
2769 | global_old_state); | |
794b37d5 | 2770 | } |
2771 | ||
2ba1fe69 | 2772 | const char *print_peer_gr_mode(enum peer_mode pr_mode) |
2773 | { | |
2774 | const char *peer_gr_mode = NULL; | |
2775 | ||
2776 | switch (pr_mode) { | |
2777 | case PEER_HELPER: | |
2778 | peer_gr_mode = "PEER_HELPER"; | |
2779 | break; | |
2780 | case PEER_GR: | |
2781 | peer_gr_mode = "PEER_GR"; | |
2782 | break; | |
2783 | case PEER_DISABLE: | |
2784 | peer_gr_mode = "PEER_DISABLE"; | |
2785 | break; | |
2786 | case PEER_INVALID: | |
2787 | peer_gr_mode = "PEER_INVALID"; | |
2788 | break; | |
2789 | case PEER_GLOBAL_INHERIT: | |
2790 | peer_gr_mode = "PEER_GLOBAL_INHERIT"; | |
2791 | break; | |
2792 | } | |
2793 | ||
2794 | return peer_gr_mode; | |
2795 | } | |
2796 | ||
2797 | const char *print_peer_gr_cmd(enum peer_gr_command pr_gr_cmd) | |
2798 | { | |
2799 | const char *peer_gr_cmd = NULL; | |
2800 | ||
2801 | switch (pr_gr_cmd) { | |
2802 | case PEER_GR_CMD: | |
2803 | peer_gr_cmd = "PEER_GR_CMD"; | |
2804 | break; | |
2805 | case NO_PEER_GR_CMD: | |
2806 | peer_gr_cmd = "NO_PEER_GR_CMD"; | |
2807 | break; | |
2808 | case PEER_DISABLE_CMD: | |
b6e410f7 | 2809 | peer_gr_cmd = "PEER_DISABLE_GR_CMD"; |
2ba1fe69 | 2810 | break; |
2811 | case NO_PEER_DISABLE_CMD: | |
b6e410f7 | 2812 | peer_gr_cmd = "NO_PEER_DISABLE_GR_CMD"; |
2ba1fe69 | 2813 | break; |
2814 | case PEER_HELPER_CMD: | |
2815 | peer_gr_cmd = "PEER_HELPER_CMD"; | |
2816 | break; | |
2817 | case NO_PEER_HELPER_CMD: | |
2818 | peer_gr_cmd = "NO_PEER_HELPER_CMD"; | |
2819 | break; | |
2820 | } | |
2821 | ||
2822 | return peer_gr_cmd; | |
2823 | } | |
2824 | ||
2825 | const char *print_global_gr_mode(enum global_mode gl_mode) | |
2826 | { | |
4b216f58 | 2827 | const char *global_gr_mode = "???"; |
2ba1fe69 | 2828 | |
2829 | switch (gl_mode) { | |
2830 | case GLOBAL_HELPER: | |
2831 | global_gr_mode = "GLOBAL_HELPER"; | |
2832 | break; | |
2833 | case GLOBAL_GR: | |
2834 | global_gr_mode = "GLOBAL_GR"; | |
2835 | break; | |
2836 | case GLOBAL_DISABLE: | |
2837 | global_gr_mode = "GLOBAL_DISABLE"; | |
2838 | break; | |
2839 | case GLOBAL_INVALID: | |
2840 | global_gr_mode = "GLOBAL_INVALID"; | |
2841 | break; | |
2842 | } | |
2843 | ||
2844 | return global_gr_mode; | |
2845 | } | |
2846 | ||
2847 | const char *print_global_gr_cmd(enum global_gr_command gl_gr_cmd) | |
2848 | { | |
2849 | const char *global_gr_cmd = NULL; | |
2850 | ||
2851 | switch (gl_gr_cmd) { | |
2852 | case GLOBAL_GR_CMD: | |
2853 | global_gr_cmd = "GLOBAL_GR_CMD"; | |
2854 | break; | |
2855 | case NO_GLOBAL_GR_CMD: | |
2856 | global_gr_cmd = "NO_GLOBAL_GR_CMD"; | |
2857 | break; | |
2858 | case GLOBAL_DISABLE_CMD: | |
2859 | global_gr_cmd = "GLOBAL_DISABLE_CMD"; | |
2860 | break; | |
2861 | case NO_GLOBAL_DISABLE_CMD: | |
2862 | global_gr_cmd = "NO_GLOBAL_DISABLE_CMD"; | |
2863 | break; | |
2864 | } | |
2865 | ||
2866 | return global_gr_cmd; | |
2867 | } | |
2868 | ||
794b37d5 | 2869 | enum global_mode bgp_global_gr_mode_get(struct bgp *bgp) |
2870 | { | |
2871 | return bgp->global_gr_present_state; | |
2872 | } | |
2873 | ||
2874 | enum peer_mode bgp_peer_gr_mode_get(struct peer *peer) | |
2875 | { | |
2876 | return peer->peer_gr_present_state; | |
2877 | } | |
2878 | ||
36235319 | 2879 | int bgp_neighbor_graceful_restart(struct peer *peer, int peer_gr_cmd) |
794b37d5 | 2880 | { |
36235319 QY |
2881 | enum peer_mode peer_new_state = PEER_INVALID; |
2882 | enum peer_mode peer_old_state = PEER_INVALID; | |
794b37d5 | 2883 | struct bgp_peer_gr peer_state; |
2884 | int result = BGP_GR_FAILURE; | |
2885 | ||
2886 | /* | |
2887 | * fetch peer_old_state from peer structure also | |
2888 | * fetch global_old_state from bgp structure, | |
2889 | * peer had a back pointer to bgpo struct ; | |
2890 | */ | |
2891 | ||
2892 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
36235319 QY |
2893 | zlog_debug("%s [BGP_GR] START:Peer: (%s) : peer_gr_cmd :%s:", |
2894 | __func__, peer->host, | |
2895 | print_peer_gr_cmd(peer_gr_cmd)); | |
794b37d5 | 2896 | |
2897 | peer_old_state = bgp_peer_gr_mode_get(peer); | |
2898 | ||
2899 | if (peer_old_state == PEER_INVALID) { | |
36235319 | 2900 | zlog_debug("[BGP_GR] peer_old_state == Invalid state !"); |
794b37d5 | 2901 | return BGP_ERR_GR_OPERATION_FAILED; |
2902 | } | |
2903 | ||
2ba1fe69 | 2904 | peer_state = peer->PEER_GR_FSM[peer_old_state][peer_gr_cmd]; |
794b37d5 | 2905 | peer_new_state = peer_state.next_state; |
2906 | ||
2907 | if (peer_new_state == PEER_INVALID) { | |
794b37d5 | 2908 | zlog_debug( |
2ba1fe69 | 2909 | "[BGP_GR] Invalid bgp graceful restart command used !"); |
794b37d5 | 2910 | return BGP_ERR_GR_INVALID_CMD; |
2911 | } | |
2912 | ||
2913 | if (peer_new_state != peer_old_state) { | |
36235319 QY |
2914 | result = peer_state.action_fun(peer, peer_old_state, |
2915 | peer_new_state); | |
794b37d5 | 2916 | } else { |
2ba1fe69 | 2917 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
2918 | zlog_debug( | |
36235319 | 2919 | "[BGP_GR] peer_old_state == peer_new_state !"); |
794b37d5 | 2920 | return BGP_GR_NO_OPERATION; |
2921 | } | |
2922 | ||
2923 | if (result == BGP_GR_SUCCESS) { | |
2924 | ||
2925 | /* Update the mode i.e peer_new_state into the peer structure */ | |
2926 | peer->peer_gr_present_state = peer_new_state; | |
794b37d5 | 2927 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
36235319 | 2928 | zlog_debug( |
2089dd80 | 2929 | "[BGP_GR] Successfully change the state of the peer to : %s : !", |
36235319 | 2930 | print_peer_gr_mode(peer_new_state)); |
794b37d5 | 2931 | |
2932 | return BGP_GR_SUCCESS; | |
2933 | } | |
2934 | ||
2935 | return result; | |
2936 | } | |
2937 | ||
36235319 QY |
2938 | unsigned int bgp_peer_gr_action(struct peer *peer, int old_peer_state, |
2939 | int new_peer_state) | |
794b37d5 | 2940 | { |
2941 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2942 | zlog_debug( | |
2ba1fe69 | 2943 | "%s [BGP_GR] Move peer from old_peer_state :%s: to new_peer_state :%s: !!!!", |
2944 | __func__, print_peer_gr_mode(old_peer_state), | |
2945 | print_peer_gr_mode(new_peer_state)); | |
794b37d5 | 2946 | |
2947 | int bgp_gr_global_mode = GLOBAL_INVALID; | |
2948 | unsigned int ret = BGP_GR_FAILURE; | |
2949 | ||
2950 | if (old_peer_state == new_peer_state) { | |
36235319 QY |
2951 | /* Nothing to do over here as the present and old state is the |
2952 | * same */ | |
794b37d5 | 2953 | return BGP_GR_NO_OPERATION; |
2954 | } | |
36235319 QY |
2955 | if ((old_peer_state == PEER_INVALID) |
2956 | || (new_peer_state == PEER_INVALID)) { | |
2957 | /* something bad happend , print error message */ | |
794b37d5 | 2958 | return BGP_ERR_GR_INVALID_CMD; |
2959 | } | |
2960 | ||
2961 | bgp_gr_global_mode = bgp_global_gr_mode_get(peer->bgp); | |
2962 | ||
36235319 QY |
2963 | if ((old_peer_state == PEER_GLOBAL_INHERIT) |
2964 | && (new_peer_state != PEER_GLOBAL_INHERIT)) { | |
794b37d5 | 2965 | |
2966 | /* fetch the Mode running in the Global state machine | |
2967 | *from the bgp structure into a variable called | |
2968 | *bgp_gr_global_mode | |
2969 | */ | |
2970 | ||
2971 | /* Here we are checking if the | |
2972 | *1. peer_new_state == global_mode == helper_mode | |
2973 | *2. peer_new_state == global_mode == GR_mode | |
2974 | *3. peer_new_state == global_mode == disabled_mode | |
2975 | */ | |
2976 | ||
2977 | BGP_PEER_GR_GLOBAL_INHERIT_UNSET(peer); | |
2978 | ||
2979 | if (new_peer_state == bgp_gr_global_mode) { | |
36235319 QY |
2980 | /*This is incremental updates i.e no tear down |
2981 | *of the existing session | |
2982 | *as the peer is already working in the same mode. | |
2983 | */ | |
794b37d5 | 2984 | ret = BGP_GR_SUCCESS; |
2985 | } else { | |
2986 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2987 | zlog_debug( | |
2ba1fe69 | 2988 | "[BGP_GR] Peer state changed from :%s ", |
2989 | print_peer_gr_mode(old_peer_state)); | |
794b37d5 | 2990 | |
2991 | bgp_peer_move_to_gr_mode(peer, new_peer_state); | |
2992 | ||
2993 | ret = BGP_GR_SUCCESS; | |
2994 | } | |
2995 | } | |
2996 | /* In the case below peer is going into Global inherit mode i.e. | |
2997 | * the peer would work as the mode configured at the global level | |
2998 | */ | |
36235319 QY |
2999 | else if ((new_peer_state == PEER_GLOBAL_INHERIT) |
3000 | && (old_peer_state != PEER_GLOBAL_INHERIT)) { | |
794b37d5 | 3001 | /* Here in this case it would be destructive |
3002 | * in all the cases except one case when, | |
3003 | * Global GR is configured Disabled | |
3004 | * and present_peer_state is not disable | |
3005 | */ | |
3006 | ||
3007 | BGP_PEER_GR_GLOBAL_INHERIT_SET(peer); | |
3008 | ||
3009 | if (old_peer_state == bgp_gr_global_mode) { | |
3010 | ||
3011 | /* This is incremental updates | |
3012 | *i.e no tear down of the existing session | |
3013 | *as the peer is already working in the same mode. | |
3014 | */ | |
3015 | ret = BGP_GR_SUCCESS; | |
3016 | } else { | |
3017 | /* Destructive always */ | |
3018 | /* Tear down the old session | |
3019 | * and send the new capability | |
3020 | * as per the bgp_gr_global_mode | |
3021 | */ | |
3022 | ||
3023 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
36235319 QY |
3024 | zlog_debug( |
3025 | "[BGP_GR] Peer state changed from :%s", | |
2ba1fe69 | 3026 | print_peer_gr_mode(old_peer_state)); |
794b37d5 | 3027 | |
3028 | bgp_peer_move_to_gr_mode(peer, bgp_gr_global_mode); | |
3029 | ||
3030 | ret = BGP_GR_SUCCESS; | |
3031 | } | |
3032 | } else { | |
3033 | /* | |
3034 | *This else case, it include all the cases except --> | |
3035 | *(new_peer_state != Peer_Global) && | |
3036 | *( old_peer_state != Peer_Global ) | |
3037 | */ | |
3038 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2ba1fe69 | 3039 | zlog_debug("[BGP_GR] Peer state changed from :%s", |
36235319 | 3040 | print_peer_gr_mode(old_peer_state)); |
794b37d5 | 3041 | |
3042 | bgp_peer_move_to_gr_mode(peer, new_peer_state); | |
3043 | ||
3044 | ret = BGP_GR_SUCCESS; | |
3045 | } | |
3046 | ||
3047 | return ret; | |
3048 | } | |
3049 | ||
3050 | inline void bgp_peer_move_to_gr_mode(struct peer *peer, int new_state) | |
3051 | ||
3052 | { | |
3053 | int bgp_global_gr_mode = bgp_global_gr_mode_get(peer->bgp); | |
3054 | ||
3055 | switch (new_state) { | |
794b37d5 | 3056 | case PEER_HELPER: |
3057 | BGP_PEER_GR_HELPER_ENABLE(peer); | |
3058 | break; | |
794b37d5 | 3059 | case PEER_GR: |
3060 | BGP_PEER_GR_ENABLE(peer); | |
3061 | break; | |
794b37d5 | 3062 | case PEER_DISABLE: |
3063 | BGP_PEER_GR_DISABLE(peer); | |
3064 | break; | |
794b37d5 | 3065 | case PEER_GLOBAL_INHERIT: |
3066 | BGP_PEER_GR_GLOBAL_INHERIT_SET(peer); | |
3067 | ||
3068 | if (bgp_global_gr_mode == GLOBAL_HELPER) { | |
3069 | BGP_PEER_GR_HELPER_ENABLE(peer); | |
36235319 | 3070 | } else if (bgp_global_gr_mode == GLOBAL_GR) { |
794b37d5 | 3071 | BGP_PEER_GR_ENABLE(peer); |
3072 | } else if (bgp_global_gr_mode == GLOBAL_DISABLE) { | |
3073 | BGP_PEER_GR_DISABLE(peer); | |
3074 | } else { | |
2ba1fe69 | 3075 | zlog_err( |
36235319 | 3076 | "[BGP_GR] Default switch inherit mode ::: SOMETHING IS WRONG !!!"); |
794b37d5 | 3077 | } |
3078 | break; | |
3079 | default: | |
36235319 QY |
3080 | zlog_err( |
3081 | "[BGP_GR] Default switch mode ::: SOMETHING IS WRONG !!!"); | |
794b37d5 | 3082 | break; |
3083 | } | |
3084 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2ba1fe69 | 3085 | zlog_debug("[BGP_GR] Peer state changed --to--> : %d : !", |
36235319 | 3086 | new_state); |
794b37d5 | 3087 | } |
3088 | ||
3089 | void bgp_peer_gr_flags_update(struct peer *peer) | |
3090 | { | |
3091 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
36235319 | 3092 | zlog_debug("%s [BGP_GR] called !", __func__); |
794b37d5 | 3093 | if (CHECK_FLAG(peer->peer_gr_new_status_flag, |
36235319 QY |
3094 | PEER_GRACEFUL_RESTART_NEW_STATE_HELPER)) |
3095 | SET_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART_HELPER); | |
794b37d5 | 3096 | else |
36235319 | 3097 | UNSET_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART_HELPER); |
794b37d5 | 3098 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
3099 | zlog_debug( | |
2ba1fe69 | 3100 | "[BGP_GR] Peer %s Flag PEER_FLAG_GRACEFUL_RESTART_HELPER : %s : !", |
794b37d5 | 3101 | peer->host, |
2986cac2 | 3102 | (CHECK_FLAG(peer->flags, |
36235319 QY |
3103 | PEER_FLAG_GRACEFUL_RESTART_HELPER) |
3104 | ? "Set" | |
3105 | : "UnSet")); | |
794b37d5 | 3106 | if (CHECK_FLAG(peer->peer_gr_new_status_flag, |
36235319 QY |
3107 | PEER_GRACEFUL_RESTART_NEW_STATE_RESTART)) |
3108 | SET_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART); | |
794b37d5 | 3109 | else |
36235319 | 3110 | UNSET_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART); |
794b37d5 | 3111 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
3112 | zlog_debug( | |
2ba1fe69 | 3113 | "[BGP_GR] Peer %s Flag PEER_FLAG_GRACEFUL_RESTART : %s : !", |
794b37d5 | 3114 | peer->host, |
36235319 QY |
3115 | (CHECK_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART) |
3116 | ? "Set" | |
3117 | : "UnSet")); | |
794b37d5 | 3118 | if (CHECK_FLAG(peer->peer_gr_new_status_flag, |
36235319 | 3119 | PEER_GRACEFUL_RESTART_NEW_STATE_INHERIT)) |
2986cac2 | 3120 | SET_FLAG(peer->flags, |
36235319 | 3121 | PEER_FLAG_GRACEFUL_RESTART_GLOBAL_INHERIT); |
794b37d5 | 3122 | else |
2986cac2 | 3123 | UNSET_FLAG(peer->flags, |
36235319 | 3124 | PEER_FLAG_GRACEFUL_RESTART_GLOBAL_INHERIT); |
794b37d5 | 3125 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
3126 | zlog_debug( | |
36235319 | 3127 | "[BGP_GR] Peer %s Flag PEER_FLAG_GRACEFUL_RESTART_GLOBAL_INHERIT : %s : !", |
794b37d5 | 3128 | peer->host, |
2986cac2 | 3129 | (CHECK_FLAG(peer->flags, |
36235319 QY |
3130 | PEER_FLAG_GRACEFUL_RESTART_GLOBAL_INHERIT) |
3131 | ? "Set" | |
3132 | : "UnSet")); | |
d7b3cda6 | 3133 | |
36235319 QY |
3134 | if (!CHECK_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART) |
3135 | && !CHECK_FLAG(peer->flags, PEER_FLAG_GRACEFUL_RESTART_HELPER)) { | |
3136 | zlog_debug("[BGP_GR] Peer %s UNSET PEER_STATUS_NSF_MODE!", | |
3137 | peer->host); | |
d7b3cda6 | 3138 | |
3139 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
3140 | ||
36235319 | 3141 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { |
d7b3cda6 | 3142 | |
3143 | peer_nsf_stop(peer); | |
3144 | zlog_debug( | |
2ba1fe69 | 3145 | "[BGP_GR] Peer %s UNSET PEER_STATUS_NSF_WAIT!", |
d7b3cda6 | 3146 | peer->host); |
3147 | } | |
3148 | } | |
794b37d5 | 3149 | } |