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d62a17ae | 1 | /* BGP-4 Finite State Machine |
896014f4 DL |
2 | * From RFC1771 [A Border Gateway Protocol 4 (BGP-4)] |
3 | * Copyright (C) 1996, 97, 98 Kunihiro Ishiguro | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along | |
18 | * with this program; see the file COPYING; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
718e3744 | 21 | |
22 | #include <zebra.h> | |
23 | ||
24 | #include "linklist.h" | |
25 | #include "prefix.h" | |
718e3744 | 26 | #include "sockunion.h" |
27 | #include "thread.h" | |
28 | #include "log.h" | |
29 | #include "stream.h" | |
74ffbfe6 | 30 | #include "ringbuf.h" |
718e3744 | 31 | #include "memory.h" |
32 | #include "plist.h" | |
f188f2c4 | 33 | #include "workqueue.h" |
3f9c7369 | 34 | #include "queue.h" |
039f3a34 | 35 | #include "filter.h" |
4dcadbef | 36 | #include "command.h" |
02705213 | 37 | #include "lib_errors.h" |
8c48b3b6 | 38 | #include "zclient.h" |
856ca177 | 39 | #include "lib/json.h" |
718e3744 | 40 | #include "bgpd/bgpd.h" |
41 | #include "bgpd/bgp_attr.h" | |
42 | #include "bgpd/bgp_debug.h" | |
14454c9f | 43 | #include "bgpd/bgp_errors.h" |
718e3744 | 44 | #include "bgpd/bgp_fsm.h" |
45 | #include "bgpd/bgp_packet.h" | |
46 | #include "bgpd/bgp_network.h" | |
47 | #include "bgpd/bgp_route.h" | |
48 | #include "bgpd/bgp_dump.h" | |
49 | #include "bgpd/bgp_open.h" | |
f188f2c4 | 50 | #include "bgpd/bgp_advertise.h" |
3f9c7369 | 51 | #include "bgpd/bgp_updgrp.h" |
ffd0c037 | 52 | #include "bgpd/bgp_nht.h" |
c43ed2e4 | 53 | #include "bgpd/bgp_bfd.h" |
4a1ab8e4 | 54 | #include "bgpd/bgp_memory.h" |
03014d48 | 55 | #include "bgpd/bgp_keepalives.h" |
56257a44 | 56 | #include "bgpd/bgp_io.h" |
c42eab4b | 57 | #include "bgpd/bgp_zebra.h" |
6b0655a2 | 58 | |
d62a17ae | 59 | DEFINE_HOOK(peer_backward_transition, (struct peer * peer), (peer)) |
7d8d0eab | 60 | DEFINE_HOOK(peer_status_changed, (struct peer * peer), (peer)) |
f009ff26 | 61 | extern const char *get_afi_safi_str(afi_t afi, |
62 | safi_t safi, bool for_json); | |
6403814c DS |
63 | /* Definition of display strings corresponding to FSM events. This should be |
64 | * kept consistent with the events defined in bgpd.h | |
65 | */ | |
2b64873d | 66 | static const char *const bgp_event_str[] = { |
d62a17ae | 67 | NULL, |
68 | "BGP_Start", | |
69 | "BGP_Stop", | |
70 | "TCP_connection_open", | |
71 | "TCP_connection_closed", | |
72 | "TCP_connection_open_failed", | |
73 | "TCP_fatal_error", | |
74 | "ConnectRetry_timer_expired", | |
75 | "Hold_Timer_expired", | |
76 | "KeepAlive_timer_expired", | |
77 | "Receive_OPEN_message", | |
78 | "Receive_KEEPALIVE_message", | |
79 | "Receive_UPDATE_message", | |
80 | "Receive_NOTIFICATION_message", | |
81 | "Clearing_Completed", | |
6403814c DS |
82 | }; |
83 | ||
718e3744 | 84 | /* BGP FSM (finite state machine) has three types of functions. Type |
85 | one is thread functions. Type two is event functions. Type three | |
86 | is FSM functions. Timer functions are set by bgp_timer_set | |
87 | function. */ | |
88 | ||
89 | /* BGP event function. */ | |
d62a17ae | 90 | int bgp_event(struct thread *); |
718e3744 | 91 | |
92 | /* BGP thread functions. */ | |
d62a17ae | 93 | static int bgp_start_timer(struct thread *); |
94 | static int bgp_connect_timer(struct thread *); | |
95 | static int bgp_holdtime_timer(struct thread *); | |
718e3744 | 96 | |
97 | /* BGP FSM functions. */ | |
d62a17ae | 98 | static int bgp_start(struct peer *); |
718e3744 | 99 | |
e2d3a909 | 100 | /* Register peer with NHT */ |
101 | static int bgp_peer_reg_with_nht(struct peer *peer) | |
102 | { | |
103 | int connected = 0; | |
104 | ||
c8d6f0d6 | 105 | if (peer->sort == BGP_PEER_EBGP && peer->ttl == BGP_DEFAULT_TTL |
e2d3a909 | 106 | && !CHECK_FLAG(peer->flags, PEER_FLAG_DISABLE_CONNECTED_CHECK) |
107 | && !bgp_flag_check(peer->bgp, BGP_FLAG_DISABLE_NH_CONNECTED_CHK)) | |
108 | connected = 1; | |
109 | ||
110 | return bgp_find_or_add_nexthop( | |
111 | peer->bgp, peer->bgp, family2afi(peer->su.sa.sa_family), | |
112 | NULL, peer, connected); | |
113 | } | |
114 | ||
d62a17ae | 115 | static void peer_xfer_stats(struct peer *peer_dst, struct peer *peer_src) |
1ff9a340 | 116 | { |
d62a17ae | 117 | /* Copy stats over. These are only the pre-established state stats */ |
118 | peer_dst->open_in += peer_src->open_in; | |
119 | peer_dst->open_out += peer_src->open_out; | |
120 | peer_dst->keepalive_in += peer_src->keepalive_in; | |
121 | peer_dst->keepalive_out += peer_src->keepalive_out; | |
122 | peer_dst->notify_in += peer_src->notify_in; | |
123 | peer_dst->notify_out += peer_src->notify_out; | |
124 | peer_dst->dynamic_cap_in += peer_src->dynamic_cap_in; | |
125 | peer_dst->dynamic_cap_out += peer_src->dynamic_cap_out; | |
1ff9a340 DS |
126 | } |
127 | ||
d62a17ae | 128 | static struct peer *peer_xfer_conn(struct peer *from_peer) |
1ff9a340 | 129 | { |
d62a17ae | 130 | struct peer *peer; |
131 | afi_t afi; | |
132 | safi_t safi; | |
133 | int fd; | |
134 | int status, pstatus; | |
135 | unsigned char last_evt, last_maj_evt; | |
136 | ||
137 | assert(from_peer != NULL); | |
138 | ||
139 | peer = from_peer->doppelganger; | |
140 | ||
141 | if (!peer || !CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE)) | |
142 | return from_peer; | |
143 | ||
9bf904cc DS |
144 | /* |
145 | * Let's check that we are not going to loose known configuration | |
146 | * state based upon doppelganger rules. | |
147 | */ | |
148 | FOREACH_AFI_SAFI (afi, safi) { | |
149 | if (from_peer->afc[afi][safi] != peer->afc[afi][safi]) { | |
150 | flog_err( | |
151 | EC_BGP_DOPPELGANGER_CONFIG, | |
152 | "from_peer->afc[%d][%d] is not the same as what we are overwriting", | |
153 | afi, safi); | |
154 | return NULL; | |
155 | } | |
156 | } | |
157 | ||
d62a17ae | 158 | if (bgp_debug_neighbor_events(peer)) |
159 | zlog_debug("%s: peer transfer %p fd %d -> %p fd %d)", | |
160 | from_peer->host, from_peer, from_peer->fd, peer, | |
161 | peer->fd); | |
162 | ||
424ab01d QY |
163 | bgp_writes_off(peer); |
164 | bgp_reads_off(peer); | |
165 | bgp_writes_off(from_peer); | |
166 | bgp_reads_off(from_peer); | |
d62a17ae | 167 | |
74e00a55 S |
168 | /* |
169 | * Before exchanging FD remove doppelganger from | |
170 | * keepalive peer hash. It could be possible conf peer | |
171 | * fd is set to -1. If blocked on lock then keepalive | |
172 | * thread can access peer pointer with fd -1. | |
173 | */ | |
174 | bgp_keepalives_off(from_peer); | |
175 | ||
d62a17ae | 176 | BGP_TIMER_OFF(peer->t_routeadv); |
424ab01d | 177 | BGP_TIMER_OFF(peer->t_connect); |
387f984e QY |
178 | BGP_TIMER_OFF(peer->t_connect_check_r); |
179 | BGP_TIMER_OFF(peer->t_connect_check_w); | |
d62a17ae | 180 | BGP_TIMER_OFF(from_peer->t_routeadv); |
424ab01d | 181 | BGP_TIMER_OFF(from_peer->t_connect); |
387f984e QY |
182 | BGP_TIMER_OFF(from_peer->t_connect_check_r); |
183 | BGP_TIMER_OFF(from_peer->t_connect_check_w); | |
7a86aa5a | 184 | BGP_TIMER_OFF(from_peer->t_process_packet); |
d3ecc69e | 185 | |
becedef6 QY |
186 | /* |
187 | * At this point in time, it is possible that there are packets pending | |
188 | * on various buffers. Those need to be transferred or dropped, | |
189 | * otherwise we'll get spurious failures during session establishment. | |
190 | */ | |
00dffa8c | 191 | frr_with_mutex(&peer->io_mtx, &from_peer->io_mtx) { |
424ab01d QY |
192 | fd = peer->fd; |
193 | peer->fd = from_peer->fd; | |
194 | from_peer->fd = fd; | |
195 | ||
196 | stream_fifo_clean(peer->ibuf); | |
d3ecc69e | 197 | stream_fifo_clean(peer->obuf); |
d3ecc69e | 198 | |
becedef6 QY |
199 | /* |
200 | * this should never happen, since bgp_process_packet() is the | |
201 | * only task that sets and unsets the current packet and it | |
202 | * runs in our pthread. | |
203 | */ | |
424ab01d | 204 | if (peer->curr) { |
af4c2728 | 205 | flog_err( |
e50f7cfd | 206 | EC_BGP_PKT_PROCESS, |
424ab01d QY |
207 | "[%s] Dropping pending packet on connection transfer:", |
208 | peer->host); | |
584470fb DL |
209 | /* there used to be a bgp_packet_dump call here, but |
210 | * that's extremely confusing since there's no way to | |
211 | * identify the packet in MRT dumps or BMP as dropped | |
212 | * due to connection transfer. | |
213 | */ | |
424ab01d QY |
214 | stream_free(peer->curr); |
215 | peer->curr = NULL; | |
216 | } | |
217 | ||
218 | // copy each packet from old peer's output queue to new peer | |
727c4f87 QY |
219 | while (from_peer->obuf->head) |
220 | stream_fifo_push(peer->obuf, | |
221 | stream_fifo_pop(from_peer->obuf)); | |
424ab01d QY |
222 | |
223 | // copy each packet from old peer's input queue to new peer | |
224 | while (from_peer->ibuf->head) | |
225 | stream_fifo_push(peer->ibuf, | |
226 | stream_fifo_pop(from_peer->ibuf)); | |
7db44ec8 | 227 | |
74ffbfe6 QY |
228 | ringbuf_wipe(peer->ibuf_work); |
229 | ringbuf_copy(peer->ibuf_work, from_peer->ibuf_work, | |
230 | ringbuf_remain(from_peer->ibuf_work)); | |
d3ecc69e | 231 | } |
d62a17ae | 232 | |
233 | peer->as = from_peer->as; | |
234 | peer->v_holdtime = from_peer->v_holdtime; | |
235 | peer->v_keepalive = from_peer->v_keepalive; | |
d62a17ae | 236 | peer->v_routeadv = from_peer->v_routeadv; |
237 | peer->v_gr_restart = from_peer->v_gr_restart; | |
238 | peer->cap = from_peer->cap; | |
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; |
d62a17ae | 253 | |
d7b3cda6 | 254 | peer->peer_gr_present_state = from_peer->peer_gr_present_state; |
255 | peer->peer_gr_new_status_flag = from_peer->peer_gr_new_status_flag; | |
256 | bgp_peer_gr_flags_update(peer); | |
257 | ||
8c48b3b6 | 258 | BGP_GR_ROUTER_DETECT_AND_SEND_CAPABILITY_TO_ZEBRA( |
259 | peer->bgp, | |
260 | peer->bgp->peer); | |
261 | ||
d7b3cda6 | 262 | if (bgp_peer_gr_mode_get(peer) == PEER_DISABLE) { |
263 | ||
264 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
265 | ||
266 | if (CHECK_FLAG(peer->sflags, | |
267 | PEER_STATUS_NSF_WAIT)) { | |
268 | peer_nsf_stop(peer); | |
269 | } | |
270 | } | |
271 | ||
d62a17ae | 272 | if (from_peer->hostname != NULL) { |
273 | if (peer->hostname) { | |
274 | XFREE(MTYPE_BGP_PEER_HOST, peer->hostname); | |
275 | peer->hostname = NULL; | |
276 | } | |
277 | ||
278 | peer->hostname = from_peer->hostname; | |
279 | from_peer->hostname = NULL; | |
280 | } | |
281 | ||
282 | if (from_peer->domainname != NULL) { | |
283 | if (peer->domainname) { | |
284 | XFREE(MTYPE_BGP_PEER_HOST, peer->domainname); | |
285 | peer->domainname = NULL; | |
286 | } | |
287 | ||
288 | peer->domainname = from_peer->domainname; | |
289 | from_peer->domainname = NULL; | |
290 | } | |
291 | ||
05c7a1cc QY |
292 | FOREACH_AFI_SAFI (afi, safi) { |
293 | peer->af_flags[afi][safi] = from_peer->af_flags[afi][safi]; | |
294 | peer->af_sflags[afi][safi] = from_peer->af_sflags[afi][safi]; | |
295 | peer->af_cap[afi][safi] = from_peer->af_cap[afi][safi]; | |
296 | peer->afc_nego[afi][safi] = from_peer->afc_nego[afi][safi]; | |
297 | peer->afc_adv[afi][safi] = from_peer->afc_adv[afi][safi]; | |
298 | peer->afc_recv[afi][safi] = from_peer->afc_recv[afi][safi]; | |
299 | peer->orf_plist[afi][safi] = from_peer->orf_plist[afi][safi]; | |
300 | } | |
d62a17ae | 301 | |
302 | if (bgp_getsockname(peer) < 0) { | |
af4c2728 | 303 | flog_err( |
450971aa | 304 | EC_LIB_SOCKET, |
d62a17ae | 305 | "%%bgp_getsockname() failed for %s peer %s fd %d (from_peer fd %d)", |
306 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER) | |
307 | ? "accept" | |
308 | : ""), | |
309 | peer->host, peer->fd, from_peer->fd); | |
310 | bgp_stop(peer); | |
311 | bgp_stop(from_peer); | |
312 | return NULL; | |
313 | } | |
314 | if (from_peer->status > Active) { | |
315 | if (bgp_getsockname(from_peer) < 0) { | |
af4c2728 | 316 | flog_err( |
450971aa | 317 | EC_LIB_SOCKET, |
d62a17ae | 318 | "%%bgp_getsockname() failed for %s from_peer %s fd %d (peer fd %d)", |
14454c9f | 319 | |
d62a17ae | 320 | (CHECK_FLAG(from_peer->sflags, |
321 | PEER_STATUS_ACCEPT_PEER) | |
322 | ? "accept" | |
323 | : ""), | |
324 | from_peer->host, from_peer->fd, peer->fd); | |
325 | bgp_stop(from_peer); | |
326 | from_peer = NULL; | |
327 | } | |
328 | } | |
329 | ||
0112e9e0 QY |
330 | |
331 | // Note: peer_xfer_stats() must be called with I/O turned OFF | |
332 | if (from_peer) | |
333 | peer_xfer_stats(peer, from_peer); | |
334 | ||
e2d3a909 | 335 | /* Register peer for NHT. This is to allow RAs to be enabled when |
336 | * needed, even on a passive connection. | |
337 | */ | |
338 | bgp_peer_reg_with_nht(peer); | |
339 | ||
424ab01d QY |
340 | bgp_reads_on(peer); |
341 | bgp_writes_on(peer); | |
7a86aa5a QY |
342 | thread_add_timer_msec(bm->master, bgp_process_packet, peer, 0, |
343 | &peer->t_process_packet); | |
d62a17ae | 344 | |
d62a17ae | 345 | return (peer); |
1ff9a340 DS |
346 | } |
347 | ||
718e3744 | 348 | /* Hook function called after bgp event is occered. And vty's |
349 | neighbor command invoke this function after making neighbor | |
350 | structure. */ | |
d62a17ae | 351 | void bgp_timer_set(struct peer *peer) |
718e3744 | 352 | { |
d62a17ae | 353 | switch (peer->status) { |
354 | case Idle: | |
355 | /* First entry point of peer's finite state machine. In Idle | |
356 | status start timer is on unless peer is shutdown or peer is | |
357 | inactive. All other timer must be turned off */ | |
f62abc7d | 358 | if (BGP_PEER_START_SUPPRESSED(peer) || !peer_active(peer) |
dded74d5 DS |
359 | || (peer->bgp->inst_type != BGP_INSTANCE_TYPE_VIEW && |
360 | peer->bgp->vrf_id == VRF_UNKNOWN)) { | |
d62a17ae | 361 | BGP_TIMER_OFF(peer->t_start); |
362 | } else { | |
363 | BGP_TIMER_ON(peer->t_start, bgp_start_timer, | |
364 | peer->v_start); | |
365 | } | |
366 | BGP_TIMER_OFF(peer->t_connect); | |
367 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 368 | bgp_keepalives_off(peer); |
d62a17ae | 369 | BGP_TIMER_OFF(peer->t_routeadv); |
370 | break; | |
371 | ||
372 | case Connect: | |
373 | /* After start timer is expired, the peer moves to Connect | |
374 | status. Make sure start timer is off and connect timer is | |
375 | on. */ | |
376 | BGP_TIMER_OFF(peer->t_start); | |
377 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
378 | peer->v_connect); | |
379 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 380 | bgp_keepalives_off(peer); |
d62a17ae | 381 | BGP_TIMER_OFF(peer->t_routeadv); |
382 | break; | |
383 | ||
384 | case Active: | |
385 | /* Active is waiting connection from remote peer. And if | |
386 | connect timer is expired, change status to Connect. */ | |
387 | BGP_TIMER_OFF(peer->t_start); | |
388 | /* If peer is passive mode, do not set connect timer. */ | |
389 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE) | |
390 | || CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
391 | BGP_TIMER_OFF(peer->t_connect); | |
392 | } else { | |
393 | BGP_TIMER_ON(peer->t_connect, bgp_connect_timer, | |
394 | peer->v_connect); | |
395 | } | |
396 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 397 | bgp_keepalives_off(peer); |
d62a17ae | 398 | BGP_TIMER_OFF(peer->t_routeadv); |
399 | break; | |
400 | ||
401 | case OpenSent: | |
402 | /* OpenSent status. */ | |
403 | BGP_TIMER_OFF(peer->t_start); | |
404 | BGP_TIMER_OFF(peer->t_connect); | |
405 | if (peer->v_holdtime != 0) { | |
406 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
407 | peer->v_holdtime); | |
408 | } else { | |
409 | BGP_TIMER_OFF(peer->t_holdtime); | |
410 | } | |
b72b6f4f | 411 | bgp_keepalives_off(peer); |
d62a17ae | 412 | BGP_TIMER_OFF(peer->t_routeadv); |
413 | break; | |
414 | ||
415 | case OpenConfirm: | |
416 | /* OpenConfirm status. */ | |
417 | BGP_TIMER_OFF(peer->t_start); | |
418 | BGP_TIMER_OFF(peer->t_connect); | |
419 | ||
420 | /* If the negotiated Hold Time value is zero, then the Hold Time | |
421 | timer and KeepAlive timers are not started. */ | |
422 | if (peer->v_holdtime == 0) { | |
423 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 424 | bgp_keepalives_off(peer); |
d62a17ae | 425 | } else { |
426 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
427 | peer->v_holdtime); | |
b72b6f4f | 428 | bgp_keepalives_on(peer); |
d62a17ae | 429 | } |
430 | BGP_TIMER_OFF(peer->t_routeadv); | |
431 | break; | |
432 | ||
433 | case Established: | |
434 | /* In Established status start and connect timer is turned | |
435 | off. */ | |
436 | BGP_TIMER_OFF(peer->t_start); | |
437 | BGP_TIMER_OFF(peer->t_connect); | |
438 | ||
439 | /* Same as OpenConfirm, if holdtime is zero then both holdtime | |
440 | and keepalive must be turned off. */ | |
441 | if (peer->v_holdtime == 0) { | |
442 | BGP_TIMER_OFF(peer->t_holdtime); | |
bea01226 | 443 | bgp_keepalives_off(peer); |
d62a17ae | 444 | } else { |
445 | BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer, | |
446 | peer->v_holdtime); | |
bea01226 | 447 | bgp_keepalives_on(peer); |
d62a17ae | 448 | } |
449 | break; | |
450 | case Deleted: | |
451 | BGP_TIMER_OFF(peer->t_gr_restart); | |
452 | BGP_TIMER_OFF(peer->t_gr_stale); | |
453 | BGP_TIMER_OFF(peer->t_pmax_restart); | |
454 | /* fallthru */ | |
455 | case Clearing: | |
456 | BGP_TIMER_OFF(peer->t_start); | |
457 | BGP_TIMER_OFF(peer->t_connect); | |
458 | BGP_TIMER_OFF(peer->t_holdtime); | |
b72b6f4f | 459 | bgp_keepalives_off(peer); |
d62a17ae | 460 | BGP_TIMER_OFF(peer->t_routeadv); |
461 | break; | |
718e3744 | 462 | } |
718e3744 | 463 | } |
464 | ||
465 | /* BGP start timer. This function set BGP_Start event to thread value | |
466 | and process event. */ | |
d62a17ae | 467 | static int bgp_start_timer(struct thread *thread) |
718e3744 | 468 | { |
d62a17ae | 469 | struct peer *peer; |
718e3744 | 470 | |
d62a17ae | 471 | peer = THREAD_ARG(thread); |
472 | peer->t_start = NULL; | |
718e3744 | 473 | |
d62a17ae | 474 | if (bgp_debug_neighbor_events(peer)) |
475 | zlog_debug("%s [FSM] Timer (start timer expire).", peer->host); | |
718e3744 | 476 | |
d62a17ae | 477 | THREAD_VAL(thread) = BGP_Start; |
478 | bgp_event(thread); /* bgp_event unlocks peer */ | |
718e3744 | 479 | |
d62a17ae | 480 | return 0; |
718e3744 | 481 | } |
482 | ||
483 | /* BGP connect retry timer. */ | |
d62a17ae | 484 | static int bgp_connect_timer(struct thread *thread) |
718e3744 | 485 | { |
d62a17ae | 486 | struct peer *peer; |
487 | int ret; | |
488 | ||
489 | peer = THREAD_ARG(thread); | |
424ab01d QY |
490 | |
491 | assert(!peer->t_write); | |
492 | assert(!peer->t_read); | |
493 | ||
d62a17ae | 494 | peer->t_connect = NULL; |
495 | ||
496 | if (bgp_debug_neighbor_events(peer)) | |
497 | zlog_debug("%s [FSM] Timer (connect timer expire)", peer->host); | |
498 | ||
499 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) { | |
500 | bgp_stop(peer); | |
501 | ret = -1; | |
502 | } else { | |
503 | THREAD_VAL(thread) = ConnectRetry_timer_expired; | |
504 | bgp_event(thread); /* bgp_event unlocks peer */ | |
505 | ret = 0; | |
506 | } | |
507 | ||
508 | return ret; | |
718e3744 | 509 | } |
510 | ||
511 | /* BGP holdtime timer. */ | |
d62a17ae | 512 | static int bgp_holdtime_timer(struct thread *thread) |
718e3744 | 513 | { |
d62a17ae | 514 | struct peer *peer; |
718e3744 | 515 | |
d62a17ae | 516 | peer = THREAD_ARG(thread); |
517 | peer->t_holdtime = NULL; | |
718e3744 | 518 | |
d62a17ae | 519 | if (bgp_debug_neighbor_events(peer)) |
520 | zlog_debug("%s [FSM] Timer (holdtime timer expire)", | |
521 | peer->host); | |
718e3744 | 522 | |
d62a17ae | 523 | THREAD_VAL(thread) = Hold_Timer_expired; |
524 | bgp_event(thread); /* bgp_event unlocks peer */ | |
718e3744 | 525 | |
d62a17ae | 526 | return 0; |
718e3744 | 527 | } |
528 | ||
d62a17ae | 529 | int bgp_routeadv_timer(struct thread *thread) |
718e3744 | 530 | { |
d62a17ae | 531 | struct peer *peer; |
718e3744 | 532 | |
d62a17ae | 533 | peer = THREAD_ARG(thread); |
534 | peer->t_routeadv = NULL; | |
718e3744 | 535 | |
d62a17ae | 536 | if (bgp_debug_neighbor_events(peer)) |
537 | zlog_debug("%s [FSM] Timer (routeadv timer expire)", | |
538 | peer->host); | |
718e3744 | 539 | |
d62a17ae | 540 | peer->synctime = bgp_clock(); |
718e3744 | 541 | |
a9794991 | 542 | thread_add_timer_msec(bm->master, bgp_generate_updgrp_packets, peer, 0, |
424ab01d QY |
543 | &peer->t_generate_updgrp_packets); |
544 | ||
d62a17ae | 545 | /* MRAI timer will be started again when FIFO is built, no need to |
546 | * do it here. | |
547 | */ | |
548 | return 0; | |
718e3744 | 549 | } |
550 | ||
e0701b79 | 551 | /* BGP Peer Down Cause */ |
2b64873d | 552 | const char *const peer_down_str[] = {"", |
d62a17ae | 553 | "Router ID changed", |
554 | "Remote AS changed", | |
555 | "Local AS change", | |
556 | "Cluster ID changed", | |
557 | "Confederation identifier changed", | |
558 | "Confederation peer changed", | |
559 | "RR client config change", | |
560 | "RS client config change", | |
561 | "Update source change", | |
562 | "Address family activated", | |
563 | "Admin. shutdown", | |
564 | "User reset", | |
565 | "BGP Notification received", | |
566 | "BGP Notification send", | |
567 | "Peer closed the session", | |
568 | "Neighbor deleted", | |
569 | "Peer-group add member", | |
570 | "Peer-group delete member", | |
571 | "Capability changed", | |
572 | "Passive config change", | |
573 | "Multihop config change", | |
574 | "NSF peer closed the session", | |
575 | "Intf peering v6only config change", | |
576 | "BFD down received", | |
577 | "Interface down", | |
05912a17 | 578 | "Neighbor address lost", |
3577f1c5 | 579 | "Waiting for NHT", |
05912a17 DD |
580 | "Waiting for Peer IPv6 LLA", |
581 | "Waiting for VRF to be initialized", | |
582 | "No AFI/SAFI activated for peer"}; | |
d62a17ae | 583 | |
584 | static int bgp_graceful_restart_timer_expire(struct thread *thread) | |
e0701b79 | 585 | { |
d62a17ae | 586 | struct peer *peer; |
587 | afi_t afi; | |
588 | safi_t safi; | |
589 | ||
590 | peer = THREAD_ARG(thread); | |
591 | peer->t_gr_restart = NULL; | |
592 | ||
593 | /* NSF delete stale route */ | |
594 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 595 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) |
d62a17ae | 596 | if (peer->nsf[afi][safi]) |
597 | bgp_clear_stale_route(peer, afi, safi); | |
598 | ||
599 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
600 | BGP_TIMER_OFF(peer->t_gr_stale); | |
601 | ||
602 | if (bgp_debug_neighbor_events(peer)) { | |
603 | zlog_debug("%s graceful restart timer expired", peer->host); | |
604 | zlog_debug("%s graceful restart stalepath timer stopped", | |
605 | peer->host); | |
606 | } | |
93406d87 | 607 | |
d62a17ae | 608 | bgp_timer_set(peer); |
93406d87 | 609 | |
d62a17ae | 610 | return 0; |
93406d87 | 611 | } |
612 | ||
d62a17ae | 613 | static int bgp_graceful_stale_timer_expire(struct thread *thread) |
93406d87 | 614 | { |
d62a17ae | 615 | struct peer *peer; |
616 | afi_t afi; | |
617 | safi_t safi; | |
93406d87 | 618 | |
d62a17ae | 619 | peer = THREAD_ARG(thread); |
620 | peer->t_gr_stale = NULL; | |
93406d87 | 621 | |
d62a17ae | 622 | if (bgp_debug_neighbor_events(peer)) |
623 | zlog_debug("%s graceful restart stalepath timer expired", | |
624 | peer->host); | |
93406d87 | 625 | |
d62a17ae | 626 | /* NSF delete stale route */ |
627 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
a08ca0a7 | 628 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) |
d62a17ae | 629 | if (peer->nsf[afi][safi]) |
630 | bgp_clear_stale_route(peer, afi, safi); | |
93406d87 | 631 | |
d62a17ae | 632 | return 0; |
93406d87 | 633 | } |
634 | ||
f009ff26 | 635 | /* Selection deferral timer processing function */ |
636 | static int bgp_graceful_deferral_timer_expire(struct thread *thread) | |
637 | { | |
638 | struct afi_safi_info *info; | |
639 | afi_t afi; | |
640 | safi_t safi; | |
641 | struct bgp *bgp; | |
642 | ||
643 | info = THREAD_ARG(thread); | |
644 | afi = info->afi; | |
645 | safi = info->safi; | |
646 | bgp = info->bgp; | |
647 | ||
648 | if (BGP_DEBUG(update, UPDATE_OUT)) | |
649 | zlog_debug("afi %d, safi %d : graceful restart deferral timer expired", | |
650 | afi, safi); | |
651 | ||
652 | bgp->gr_info[afi][safi].t_select_deferral = NULL; | |
653 | ||
654 | bgp->gr_info[afi][safi].eor_required = 0; | |
655 | bgp->gr_info[afi][safi].eor_received = 0; | |
656 | XFREE(MTYPE_TMP, info); | |
657 | ||
658 | /* Best path selection */ | |
659 | return bgp_best_path_select_defer(bgp, afi, safi); | |
660 | } | |
661 | ||
d62a17ae | 662 | static int bgp_update_delay_applicable(struct bgp *bgp) |
f188f2c4 | 663 | { |
d62a17ae | 664 | /* update_delay_over flag should be reset (set to 0) for any new |
665 | applicability of the update-delay during BGP process lifetime. | |
666 | And it should be set after an occurence of the update-delay is | |
667 | over)*/ | |
668 | if (!bgp->update_delay_over) | |
669 | return 1; | |
670 | ||
671 | return 0; | |
f188f2c4 DS |
672 | } |
673 | ||
d62a17ae | 674 | int bgp_update_delay_active(struct bgp *bgp) |
f188f2c4 | 675 | { |
d62a17ae | 676 | if (bgp->t_update_delay) |
677 | return 1; | |
f188f2c4 | 678 | |
d62a17ae | 679 | return 0; |
f188f2c4 DS |
680 | } |
681 | ||
d62a17ae | 682 | int bgp_update_delay_configured(struct bgp *bgp) |
f188f2c4 | 683 | { |
d62a17ae | 684 | if (bgp->v_update_delay) |
685 | return 1; | |
f188f2c4 | 686 | |
d62a17ae | 687 | return 0; |
f188f2c4 DS |
688 | } |
689 | ||
690 | /* Do the post-processing needed when bgp comes out of the read-only mode | |
691 | on ending the update delay. */ | |
d62a17ae | 692 | void bgp_update_delay_end(struct bgp *bgp) |
f188f2c4 | 693 | { |
d62a17ae | 694 | THREAD_TIMER_OFF(bgp->t_update_delay); |
695 | THREAD_TIMER_OFF(bgp->t_establish_wait); | |
696 | ||
697 | /* Reset update-delay related state */ | |
698 | bgp->update_delay_over = 1; | |
699 | bgp->established = 0; | |
700 | bgp->restarted_peers = 0; | |
701 | bgp->implicit_eors = 0; | |
702 | bgp->explicit_eors = 0; | |
703 | ||
704 | quagga_timestamp(3, bgp->update_delay_end_time, | |
705 | sizeof(bgp->update_delay_end_time)); | |
706 | ||
707 | /* | |
708 | * Add an end-of-initial-update marker to the main process queues so | |
709 | * that | |
710 | * the route advertisement timer for the peers can be started. Also set | |
711 | * the zebra and peer update hold flags. These flags are used to achieve | |
712 | * three stages in the update-delay post processing: | |
713 | * 1. Finish best-path selection for all the prefixes held on the | |
714 | * queues. | |
715 | * (routes in BGP are updated, and peers sync queues are populated | |
716 | * too) | |
717 | * 2. As the eoiu mark is reached in the bgp process routine, ship all | |
718 | * the | |
719 | * routes to zebra. With that zebra should see updates from BGP | |
720 | * close | |
721 | * to each other. | |
722 | * 3. Unblock the peer update writes. With that peer update packing | |
723 | * with | |
724 | * the prefixes should be at its maximum. | |
725 | */ | |
726 | bgp_add_eoiu_mark(bgp); | |
727 | bgp->main_zebra_update_hold = 1; | |
728 | bgp->main_peers_update_hold = 1; | |
729 | ||
730 | /* Resume the queue processing. This should trigger the event that would | |
731 | take | |
732 | care of processing any work that was queued during the read-only | |
733 | mode. */ | |
734 | work_queue_unplug(bm->process_main_queue); | |
f188f2c4 DS |
735 | } |
736 | ||
cb1faec9 DS |
737 | /** |
738 | * see bgp_fsm.h | |
739 | */ | |
d62a17ae | 740 | void bgp_start_routeadv(struct bgp *bgp) |
cb1faec9 | 741 | { |
d62a17ae | 742 | struct listnode *node, *nnode; |
743 | struct peer *peer; | |
cb1faec9 | 744 | |
d62a17ae | 745 | zlog_info("bgp_start_routeadv(), update hold status %d", |
746 | bgp->main_peers_update_hold); | |
4a16ae86 | 747 | |
d62a17ae | 748 | if (bgp->main_peers_update_hold) |
749 | return; | |
4a16ae86 | 750 | |
d62a17ae | 751 | quagga_timestamp(3, bgp->update_delay_peers_resume_time, |
752 | sizeof(bgp->update_delay_peers_resume_time)); | |
4a16ae86 | 753 | |
d62a17ae | 754 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) { |
755 | if (peer->status != Established) | |
756 | continue; | |
757 | BGP_TIMER_OFF(peer->t_routeadv); | |
758 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
759 | } | |
cb1faec9 DS |
760 | } |
761 | ||
762 | /** | |
763 | * see bgp_fsm.h | |
764 | */ | |
d62a17ae | 765 | void bgp_adjust_routeadv(struct peer *peer) |
cb1faec9 | 766 | { |
d62a17ae | 767 | time_t nowtime = bgp_clock(); |
768 | double diff; | |
769 | unsigned long remain; | |
770 | ||
771 | /* Bypass checks for special case of MRAI being 0 */ | |
772 | if (peer->v_routeadv == 0) { | |
773 | /* Stop existing timer, just in case it is running for a | |
774 | * different | |
775 | * duration and schedule write thread immediately. | |
776 | */ | |
777 | if (peer->t_routeadv) | |
778 | BGP_TIMER_OFF(peer->t_routeadv); | |
779 | ||
780 | peer->synctime = bgp_clock(); | |
a9794991 | 781 | thread_add_timer_msec(bm->master, bgp_generate_updgrp_packets, |
424ab01d QY |
782 | peer, 0, |
783 | &peer->t_generate_updgrp_packets); | |
d62a17ae | 784 | return; |
785 | } | |
786 | ||
787 | ||
788 | /* | |
789 | * CASE I: | |
790 | * If the last update was written more than MRAI back, expire the timer | |
791 | * instantly so that we can send the update out sooner. | |
792 | * | |
793 | * <------- MRAI ---------> | |
794 | * |-----------------|-----------------------| | |
795 | * <------------- m ------------> | |
796 | * ^ ^ ^ | |
797 | * | | | | |
798 | * | | current time | |
799 | * | timer start | |
800 | * last write | |
801 | * | |
802 | * m > MRAI | |
803 | */ | |
804 | diff = difftime(nowtime, peer->last_update); | |
805 | if (diff > (double)peer->v_routeadv) { | |
806 | BGP_TIMER_OFF(peer->t_routeadv); | |
807 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
808 | return; | |
809 | } | |
810 | ||
811 | /* | |
812 | * CASE II: | |
813 | * - Find when to expire the MRAI timer. | |
814 | * If MRAI timer is not active, assume we can start it now. | |
815 | * | |
816 | * <------- MRAI ---------> | |
817 | * |------------|-----------------------| | |
818 | * <-------- m ----------><----- r -----> | |
819 | * ^ ^ ^ | |
820 | * | | | | |
821 | * | | current time | |
822 | * | timer start | |
823 | * last write | |
824 | * | |
825 | * (MRAI - m) < r | |
826 | */ | |
827 | if (peer->t_routeadv) | |
828 | remain = thread_timer_remain_second(peer->t_routeadv); | |
829 | else | |
830 | remain = peer->v_routeadv; | |
831 | diff = peer->v_routeadv - diff; | |
832 | if (diff <= (double)remain) { | |
833 | BGP_TIMER_OFF(peer->t_routeadv); | |
834 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, diff); | |
835 | } | |
cb1faec9 DS |
836 | } |
837 | ||
d62a17ae | 838 | static int bgp_maxmed_onstartup_applicable(struct bgp *bgp) |
abc920f8 | 839 | { |
d62a17ae | 840 | if (!bgp->maxmed_onstartup_over) |
841 | return 1; | |
abc920f8 | 842 | |
d62a17ae | 843 | return 0; |
abc920f8 DS |
844 | } |
845 | ||
d62a17ae | 846 | int bgp_maxmed_onstartup_configured(struct bgp *bgp) |
abc920f8 | 847 | { |
d62a17ae | 848 | if (bgp->v_maxmed_onstartup != BGP_MAXMED_ONSTARTUP_UNCONFIGURED) |
849 | return 1; | |
abc920f8 | 850 | |
d62a17ae | 851 | return 0; |
abc920f8 DS |
852 | } |
853 | ||
d62a17ae | 854 | int bgp_maxmed_onstartup_active(struct bgp *bgp) |
abc920f8 | 855 | { |
d62a17ae | 856 | if (bgp->t_maxmed_onstartup) |
857 | return 1; | |
abc920f8 | 858 | |
d62a17ae | 859 | return 0; |
abc920f8 DS |
860 | } |
861 | ||
d62a17ae | 862 | void bgp_maxmed_update(struct bgp *bgp) |
abc920f8 | 863 | { |
d7c0a89a QY |
864 | uint8_t maxmed_active; |
865 | uint32_t maxmed_value; | |
d62a17ae | 866 | |
867 | if (bgp->v_maxmed_admin) { | |
868 | maxmed_active = 1; | |
869 | maxmed_value = bgp->maxmed_admin_value; | |
870 | } else if (bgp->t_maxmed_onstartup) { | |
871 | maxmed_active = 1; | |
872 | maxmed_value = bgp->maxmed_onstartup_value; | |
873 | } else { | |
874 | maxmed_active = 0; | |
875 | maxmed_value = BGP_MAXMED_VALUE_DEFAULT; | |
876 | } | |
877 | ||
878 | if (bgp->maxmed_active != maxmed_active | |
879 | || bgp->maxmed_value != maxmed_value) { | |
880 | bgp->maxmed_active = maxmed_active; | |
881 | bgp->maxmed_value = maxmed_value; | |
882 | ||
883 | update_group_announce(bgp); | |
884 | } | |
abc920f8 DS |
885 | } |
886 | ||
887 | /* The maxmed onstartup timer expiry callback. */ | |
d62a17ae | 888 | static int bgp_maxmed_onstartup_timer(struct thread *thread) |
abc920f8 | 889 | { |
d62a17ae | 890 | struct bgp *bgp; |
abc920f8 | 891 | |
d62a17ae | 892 | zlog_info("Max med on startup ended - timer expired."); |
abc920f8 | 893 | |
d62a17ae | 894 | bgp = THREAD_ARG(thread); |
895 | THREAD_TIMER_OFF(bgp->t_maxmed_onstartup); | |
896 | bgp->maxmed_onstartup_over = 1; | |
abc920f8 | 897 | |
d62a17ae | 898 | bgp_maxmed_update(bgp); |
abc920f8 | 899 | |
d62a17ae | 900 | return 0; |
abc920f8 DS |
901 | } |
902 | ||
d62a17ae | 903 | static void bgp_maxmed_onstartup_begin(struct bgp *bgp) |
abc920f8 | 904 | { |
d62a17ae | 905 | /* Applicable only once in the process lifetime on the startup */ |
906 | if (bgp->maxmed_onstartup_over) | |
907 | return; | |
abc920f8 | 908 | |
d62a17ae | 909 | zlog_info("Begin maxmed onstartup mode - timer %d seconds", |
910 | bgp->v_maxmed_onstartup); | |
abc920f8 | 911 | |
d62a17ae | 912 | thread_add_timer(bm->master, bgp_maxmed_onstartup_timer, bgp, |
913 | bgp->v_maxmed_onstartup, &bgp->t_maxmed_onstartup); | |
abc920f8 | 914 | |
d62a17ae | 915 | if (!bgp->v_maxmed_admin) { |
916 | bgp->maxmed_active = 1; | |
917 | bgp->maxmed_value = bgp->maxmed_onstartup_value; | |
918 | } | |
abc920f8 | 919 | |
d62a17ae | 920 | /* Route announce to all peers should happen after this in |
921 | * bgp_establish() */ | |
abc920f8 DS |
922 | } |
923 | ||
d62a17ae | 924 | static void bgp_maxmed_onstartup_process_status_change(struct peer *peer) |
abc920f8 | 925 | { |
d62a17ae | 926 | if (peer->status == Established && !peer->bgp->established) { |
927 | bgp_maxmed_onstartup_begin(peer->bgp); | |
928 | } | |
abc920f8 DS |
929 | } |
930 | ||
f188f2c4 | 931 | /* The update delay timer expiry callback. */ |
d62a17ae | 932 | static int bgp_update_delay_timer(struct thread *thread) |
f188f2c4 | 933 | { |
d62a17ae | 934 | struct bgp *bgp; |
f188f2c4 | 935 | |
d62a17ae | 936 | zlog_info("Update delay ended - timer expired."); |
f188f2c4 | 937 | |
d62a17ae | 938 | bgp = THREAD_ARG(thread); |
939 | THREAD_TIMER_OFF(bgp->t_update_delay); | |
940 | bgp_update_delay_end(bgp); | |
f188f2c4 | 941 | |
d62a17ae | 942 | return 0; |
f188f2c4 DS |
943 | } |
944 | ||
945 | /* The establish wait timer expiry callback. */ | |
d62a17ae | 946 | static int bgp_establish_wait_timer(struct thread *thread) |
f188f2c4 | 947 | { |
d62a17ae | 948 | struct bgp *bgp; |
f188f2c4 | 949 | |
d62a17ae | 950 | zlog_info("Establish wait - timer expired."); |
f188f2c4 | 951 | |
d62a17ae | 952 | bgp = THREAD_ARG(thread); |
953 | THREAD_TIMER_OFF(bgp->t_establish_wait); | |
954 | bgp_check_update_delay(bgp); | |
f188f2c4 | 955 | |
d62a17ae | 956 | return 0; |
f188f2c4 DS |
957 | } |
958 | ||
959 | /* Steps to begin the update delay: | |
960 | - initialize queues if needed | |
961 | - stop the queue processing | |
962 | - start the timer */ | |
d62a17ae | 963 | static void bgp_update_delay_begin(struct bgp *bgp) |
f188f2c4 | 964 | { |
d62a17ae | 965 | struct listnode *node, *nnode; |
966 | struct peer *peer; | |
f188f2c4 | 967 | |
d62a17ae | 968 | /* Stop the processing of queued work. Enqueue shall continue */ |
969 | work_queue_plug(bm->process_main_queue); | |
f188f2c4 | 970 | |
d62a17ae | 971 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) |
972 | peer->update_delay_over = 0; | |
f188f2c4 | 973 | |
d62a17ae | 974 | /* Start the update-delay timer */ |
975 | thread_add_timer(bm->master, bgp_update_delay_timer, bgp, | |
976 | bgp->v_update_delay, &bgp->t_update_delay); | |
f188f2c4 | 977 | |
d62a17ae | 978 | if (bgp->v_establish_wait != bgp->v_update_delay) |
979 | thread_add_timer(bm->master, bgp_establish_wait_timer, bgp, | |
980 | bgp->v_establish_wait, &bgp->t_establish_wait); | |
f188f2c4 | 981 | |
d62a17ae | 982 | quagga_timestamp(3, bgp->update_delay_begin_time, |
983 | sizeof(bgp->update_delay_begin_time)); | |
f188f2c4 DS |
984 | } |
985 | ||
d62a17ae | 986 | static void bgp_update_delay_process_status_change(struct peer *peer) |
f188f2c4 | 987 | { |
d62a17ae | 988 | if (peer->status == Established) { |
989 | if (!peer->bgp->established++) { | |
990 | bgp_update_delay_begin(peer->bgp); | |
991 | zlog_info( | |
992 | "Begin read-only mode - update-delay timer %d seconds", | |
993 | peer->bgp->v_update_delay); | |
994 | } | |
995 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_BIT_RCV)) | |
996 | bgp_update_restarted_peers(peer); | |
997 | } | |
998 | if (peer->ostatus == Established | |
999 | && bgp_update_delay_active(peer->bgp)) { | |
1000 | /* Adjust the update-delay state to account for this flap. | |
1001 | NOTE: Intentionally skipping adjusting implicit_eors or | |
1002 | explicit_eors | |
1003 | counters. Extra sanity check in bgp_check_update_delay() | |
1004 | should | |
1005 | be enough to take care of any additive discrepancy in bgp eor | |
1006 | counters */ | |
1007 | peer->bgp->established--; | |
1008 | peer->update_delay_over = 0; | |
1009 | } | |
f188f2c4 DS |
1010 | } |
1011 | ||
0437e105 | 1012 | /* Called after event occurred, this function change status and reset |
200df115 | 1013 | read/write and timer thread. */ |
d62a17ae | 1014 | void bgp_fsm_change_status(struct peer *peer, int status) |
200df115 | 1015 | { |
36dc7588 | 1016 | struct bgp *bgp; |
1017 | uint32_t peer_count; | |
1ff9a340 | 1018 | |
36dc7588 | 1019 | bgp = peer->bgp; |
1020 | peer_count = bgp->established_peers; | |
1021 | ||
1022 | if (status == Established) | |
1023 | bgp->established_peers++; | |
1024 | else if ((peer->status == Established) && (status != Established)) | |
1025 | bgp->established_peers--; | |
1026 | ||
1cfe005d DS |
1027 | if (bgp_debug_neighbor_events(peer)) { |
1028 | struct vrf *vrf = vrf_lookup_by_id(bgp->vrf_id); | |
1029 | ||
1030 | zlog_debug("%s : vrf %s(%u), Status: %s established_peers %u", __func__, | |
1031 | vrf ? vrf->name : "Unknown", bgp->vrf_id, | |
1032 | lookup_msg(bgp_status_msg, status, NULL), | |
1033 | bgp->established_peers); | |
1034 | } | |
1035 | ||
36dc7588 | 1036 | /* Set to router ID to the value provided by RIB if there are no peers |
1037 | * in the established state and peer count did not change | |
1038 | */ | |
1039 | if ((peer_count != bgp->established_peers) && | |
1040 | (bgp->established_peers == 0)) | |
1041 | bgp_router_id_zebra_bump(bgp->vrf_id, NULL); | |
1042 | ||
d62a17ae | 1043 | /* Transition into Clearing or Deleted must /always/ clear all routes.. |
1044 | * (and must do so before actually changing into Deleted.. | |
1045 | */ | |
1046 | if (status >= Clearing) { | |
1047 | bgp_clear_route_all(peer); | |
1048 | ||
1049 | /* If no route was queued for the clear-node processing, | |
1050 | * generate the | |
1051 | * completion event here. This is needed because if there are no | |
1052 | * routes | |
1053 | * to trigger the background clear-node thread, the event won't | |
1054 | * get | |
1055 | * generated and the peer would be stuck in Clearing. Note that | |
1056 | * this | |
1057 | * event is for the peer and helps the peer transition out of | |
1058 | * Clearing | |
1059 | * state; it should not be generated per (AFI,SAFI). The event | |
1060 | * is | |
1061 | * directly posted here without calling clear_node_complete() as | |
1062 | * we | |
1063 | * shouldn't do an extra unlock. This event will get processed | |
1064 | * after | |
1065 | * the state change that happens below, so peer will be in | |
1066 | * Clearing | |
1067 | * (or Deleted). | |
1068 | */ | |
1069 | if (!work_queue_is_scheduled(peer->clear_node_queue)) | |
1070 | BGP_EVENT_ADD(peer, Clearing_Completed); | |
1071 | } | |
1072 | ||
1073 | /* Preserve old status and change into new status. */ | |
1074 | peer->ostatus = peer->status; | |
1075 | peer->status = status; | |
1076 | ||
1077 | /* Save event that caused status change. */ | |
1078 | peer->last_major_event = peer->cur_event; | |
1079 | ||
7d8d0eab MKS |
1080 | /* Operations after status change */ |
1081 | hook_call(peer_status_changed, peer); | |
1082 | ||
d62a17ae | 1083 | if (status == Established) |
1084 | UNSET_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER); | |
1085 | ||
1086 | /* If max-med processing is applicable, do the necessary. */ | |
1087 | if (status == Established) { | |
1088 | if (bgp_maxmed_onstartup_configured(peer->bgp) | |
1089 | && bgp_maxmed_onstartup_applicable(peer->bgp)) | |
1090 | bgp_maxmed_onstartup_process_status_change(peer); | |
1091 | else | |
1092 | peer->bgp->maxmed_onstartup_over = 1; | |
1093 | } | |
1094 | ||
1095 | /* If update-delay processing is applicable, do the necessary. */ | |
1096 | if (bgp_update_delay_configured(peer->bgp) | |
1097 | && bgp_update_delay_applicable(peer->bgp)) | |
1098 | bgp_update_delay_process_status_change(peer); | |
1099 | ||
1100 | if (bgp_debug_neighbor_events(peer)) | |
1101 | zlog_debug("%s went from %s to %s", peer->host, | |
1102 | lookup_msg(bgp_status_msg, peer->ostatus, NULL), | |
1103 | lookup_msg(bgp_status_msg, peer->status, NULL)); | |
200df115 | 1104 | } |
1105 | ||
3117b5c4 | 1106 | /* Flush the event queue and ensure the peer is shut down */ |
d62a17ae | 1107 | static int bgp_clearing_completed(struct peer *peer) |
3117b5c4 | 1108 | { |
d62a17ae | 1109 | int rc = bgp_stop(peer); |
1ff9a340 | 1110 | |
d62a17ae | 1111 | if (rc >= 0) |
1112 | BGP_EVENT_FLUSH(peer); | |
3117b5c4 | 1113 | |
d62a17ae | 1114 | return rc; |
3117b5c4 SH |
1115 | } |
1116 | ||
718e3744 | 1117 | /* Administrative BGP peer stop event. */ |
3117b5c4 | 1118 | /* May be called multiple times for the same peer */ |
d62a17ae | 1119 | int bgp_stop(struct peer *peer) |
718e3744 | 1120 | { |
d62a17ae | 1121 | afi_t afi; |
1122 | safi_t safi; | |
1123 | char orf_name[BUFSIZ]; | |
1124 | int ret = 0; | |
f009ff26 | 1125 | struct bgp *bgp = peer->bgp; |
1126 | struct graceful_restart_info *gr_info = NULL; | |
d62a17ae | 1127 | |
2ba1fe69 | 1128 | peer->nsf_af_count = 0; |
1129 | ||
d62a17ae | 1130 | if (peer_dynamic_neighbor(peer) |
1131 | && !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
1132 | if (bgp_debug_neighbor_events(peer)) | |
1133 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1134 | peer_delete(peer); | |
1135 | return -1; | |
c22767d8 | 1136 | } |
848973c7 | 1137 | |
d62a17ae | 1138 | /* Can't do this in Clearing; events are used for state transitions */ |
1139 | if (peer->status != Clearing) { | |
1140 | /* Delete all existing events of the peer */ | |
1141 | BGP_EVENT_FLUSH(peer); | |
93406d87 | 1142 | } |
d62a17ae | 1143 | |
1144 | /* Increment Dropped count. */ | |
1145 | if (peer->status == Established) { | |
1146 | peer->dropped++; | |
1147 | ||
1148 | /* bgp log-neighbor-changes of neighbor Down */ | |
1149 | if (bgp_flag_check(peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { | |
1150 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); | |
2986cac2 | 1151 | |
d62a17ae | 1152 | zlog_info( |
1153 | "%%ADJCHANGE: neighbor %s(%s) in vrf %s Down %s", | |
1154 | peer->host, | |
1155 | (peer->hostname) ? peer->hostname : "Unknown", | |
5742e42b DS |
1156 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) |
1157 | ? vrf->name | |
1158 | : VRF_DEFAULT_NAME) | |
d62a17ae | 1159 | : "", |
1160 | peer_down_str[(int)peer->last_reset]); | |
1161 | } | |
1162 | ||
1163 | /* graceful restart */ | |
1164 | if (peer->t_gr_stale) { | |
1165 | BGP_TIMER_OFF(peer->t_gr_stale); | |
1166 | if (bgp_debug_neighbor_events(peer)) | |
1167 | zlog_debug( | |
1168 | "%s graceful restart stalepath timer stopped", | |
1169 | peer->host); | |
1170 | } | |
1171 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { | |
1172 | if (bgp_debug_neighbor_events(peer)) { | |
1173 | zlog_debug( | |
1174 | "%s graceful restart timer started for %d sec", | |
1175 | peer->host, peer->v_gr_restart); | |
1176 | zlog_debug( | |
1177 | "%s graceful restart stalepath timer started for %d sec", | |
1178 | peer->host, peer->bgp->stalepath_time); | |
1179 | } | |
1180 | BGP_TIMER_ON(peer->t_gr_restart, | |
1181 | bgp_graceful_restart_timer_expire, | |
1182 | peer->v_gr_restart); | |
1183 | BGP_TIMER_ON(peer->t_gr_stale, | |
1184 | bgp_graceful_stale_timer_expire, | |
1185 | peer->bgp->stalepath_time); | |
1186 | } else { | |
1187 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1188 | ||
1189 | for (afi = AFI_IP; afi < AFI_MAX; afi++) | |
996c9314 LB |
1190 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; |
1191 | safi++) | |
d62a17ae | 1192 | peer->nsf[afi][safi] = 0; |
1193 | } | |
1194 | ||
f009ff26 | 1195 | /* If peer reset before receiving EOR, decrement EOR count and |
1196 | * cancel the selection deferral timer if there are no | |
1197 | * pending EOR messages to be received | |
1198 | */ | |
1199 | if (BGP_PEER_GRACEFUL_RESTART_CAPABLE(peer)) { | |
1200 | FOREACH_AFI_SAFI (afi, safi) { | |
1201 | if (peer->afc_nego[afi][safi] && | |
1202 | !CHECK_FLAG(peer->af_sflags[afi][safi], | |
1203 | PEER_STATUS_EOR_RECEIVED)) { | |
1204 | gr_info = &bgp->gr_info[afi][safi]; | |
9e3b51a7 | 1205 | |
1206 | if (gr_info && (gr_info->eor_required)) | |
f009ff26 | 1207 | gr_info->eor_required--; |
9e3b51a7 | 1208 | |
1209 | if (gr_info && BGP_DEBUG(update, | |
1210 | UPDATE_OUT)) | |
1211 | zlog_debug( | |
2ba1fe69 | 1212 | "peer %s, EOR_required %d", |
f009ff26 | 1213 | peer->host, |
1214 | gr_info->eor_required); | |
1215 | ||
1216 | /* There is no pending EOR message */ | |
9e3b51a7 | 1217 | if (gr_info && gr_info->eor_required |
1218 | == 0) { | |
f009ff26 | 1219 | BGP_TIMER_OFF( |
1220 | gr_info->t_select_deferral); | |
1221 | gr_info->eor_received = 0; | |
1222 | } | |
1223 | } | |
1224 | } | |
1225 | } | |
1226 | ||
d62a17ae | 1227 | /* set last reset time */ |
1228 | peer->resettime = peer->uptime = bgp_clock(); | |
1229 | ||
1230 | if (BGP_DEBUG(update_groups, UPDATE_GROUPS)) | |
1231 | zlog_debug("%s remove from all update group", | |
1232 | peer->host); | |
1233 | update_group_remove_peer_afs(peer); | |
1234 | ||
1235 | hook_call(peer_backward_transition, peer); | |
1236 | ||
1237 | /* Reset peer synctime */ | |
1238 | peer->synctime = 0; | |
93406d87 | 1239 | } |
93406d87 | 1240 | |
424ab01d | 1241 | /* stop keepalives */ |
b72b6f4f | 1242 | bgp_keepalives_off(peer); |
424ab01d QY |
1243 | |
1244 | /* Stop read and write threads. */ | |
1245 | bgp_writes_off(peer); | |
1246 | bgp_reads_off(peer); | |
1247 | ||
387f984e QY |
1248 | THREAD_OFF(peer->t_connect_check_r); |
1249 | THREAD_OFF(peer->t_connect_check_w); | |
d62a17ae | 1250 | |
1251 | /* Stop all timers. */ | |
1252 | BGP_TIMER_OFF(peer->t_start); | |
1253 | BGP_TIMER_OFF(peer->t_connect); | |
1254 | BGP_TIMER_OFF(peer->t_holdtime); | |
d62a17ae | 1255 | BGP_TIMER_OFF(peer->t_routeadv); |
d62a17ae | 1256 | |
1257 | /* Clear input and output buffer. */ | |
00dffa8c | 1258 | frr_with_mutex(&peer->io_mtx) { |
424ab01d QY |
1259 | if (peer->ibuf) |
1260 | stream_fifo_clean(peer->ibuf); | |
d3ecc69e QY |
1261 | if (peer->obuf) |
1262 | stream_fifo_clean(peer->obuf); | |
424ab01d QY |
1263 | |
1264 | if (peer->ibuf_work) | |
74ffbfe6 | 1265 | ringbuf_wipe(peer->ibuf_work); |
424ab01d QY |
1266 | if (peer->obuf_work) |
1267 | stream_reset(peer->obuf_work); | |
1268 | ||
1269 | if (peer->curr) { | |
1270 | stream_free(peer->curr); | |
1271 | peer->curr = NULL; | |
1272 | } | |
d3ecc69e | 1273 | } |
d62a17ae | 1274 | |
1275 | /* Close of file descriptor. */ | |
1276 | if (peer->fd >= 0) { | |
1277 | close(peer->fd); | |
1278 | peer->fd = -1; | |
93406d87 | 1279 | } |
1280 | ||
05c7a1cc QY |
1281 | FOREACH_AFI_SAFI (afi, safi) { |
1282 | /* Reset all negotiated variables */ | |
1283 | peer->afc_nego[afi][safi] = 0; | |
1284 | peer->afc_adv[afi][safi] = 0; | |
1285 | peer->afc_recv[afi][safi] = 0; | |
1286 | ||
1287 | /* peer address family capability flags*/ | |
1288 | peer->af_cap[afi][safi] = 0; | |
1289 | ||
1290 | /* peer address family status flags*/ | |
1291 | peer->af_sflags[afi][safi] = 0; | |
1292 | ||
1293 | /* Received ORF prefix-filter */ | |
1294 | peer->orf_plist[afi][safi] = NULL; | |
1295 | ||
1296 | if ((peer->status == OpenConfirm) | |
1297 | || (peer->status == Established)) { | |
1298 | /* ORF received prefix-filter pnt */ | |
1299 | sprintf(orf_name, "%s.%d.%d", peer->host, afi, safi); | |
1300 | prefix_bgp_orf_remove_all(afi, orf_name); | |
d62a17ae | 1301 | } |
05c7a1cc | 1302 | } |
d62a17ae | 1303 | |
1304 | /* Reset keepalive and holdtime */ | |
b90a8e13 | 1305 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER)) { |
d62a17ae | 1306 | peer->v_keepalive = peer->keepalive; |
1307 | peer->v_holdtime = peer->holdtime; | |
1308 | } else { | |
1309 | peer->v_keepalive = peer->bgp->default_keepalive; | |
1310 | peer->v_holdtime = peer->bgp->default_holdtime; | |
1ff9a340 | 1311 | } |
d62a17ae | 1312 | |
1313 | peer->update_time = 0; | |
1314 | ||
1315 | /* Until we are sure that there is no problem about prefix count | |
1316 | this should be commented out.*/ | |
718e3744 | 1317 | #if 0 |
1318 | /* Reset prefix count */ | |
1319 | peer->pcount[AFI_IP][SAFI_UNICAST] = 0; | |
1320 | peer->pcount[AFI_IP][SAFI_MULTICAST] = 0; | |
cd1964ff | 1321 | peer->pcount[AFI_IP][SAFI_LABELED_UNICAST] = 0; |
718e3744 | 1322 | peer->pcount[AFI_IP][SAFI_MPLS_VPN] = 0; |
1323 | peer->pcount[AFI_IP6][SAFI_UNICAST] = 0; | |
1324 | peer->pcount[AFI_IP6][SAFI_MULTICAST] = 0; | |
cd1964ff | 1325 | peer->pcount[AFI_IP6][SAFI_LABELED_UNICAST] = 0; |
718e3744 | 1326 | #endif /* 0 */ |
1327 | ||
d62a17ae | 1328 | if (!CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE) |
1329 | && !(CHECK_FLAG(peer->flags, PEER_FLAG_DELETE))) { | |
1330 | peer_delete(peer); | |
1331 | ret = -1; | |
1332 | } else { | |
1333 | bgp_peer_conf_if_to_su_update(peer); | |
1334 | } | |
d62a17ae | 1335 | return ret; |
718e3744 | 1336 | } |
1337 | ||
1338 | /* BGP peer is stoped by the error. */ | |
d62a17ae | 1339 | static int bgp_stop_with_error(struct peer *peer) |
718e3744 | 1340 | { |
d62a17ae | 1341 | /* Double start timer. */ |
1342 | peer->v_start *= 2; | |
1343 | ||
1344 | /* Overflow check. */ | |
1345 | if (peer->v_start >= (60 * 2)) | |
1346 | peer->v_start = (60 * 2); | |
1347 | ||
1348 | if (peer_dynamic_neighbor(peer)) { | |
1349 | if (bgp_debug_neighbor_events(peer)) | |
1350 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1351 | peer_delete(peer); | |
1352 | return -1; | |
1353 | } | |
1354 | ||
1355 | return (bgp_stop(peer)); | |
718e3744 | 1356 | } |
1357 | ||
397b5bde LR |
1358 | |
1359 | /* something went wrong, send notify and tear down */ | |
d7c0a89a QY |
1360 | static int bgp_stop_with_notify(struct peer *peer, uint8_t code, |
1361 | uint8_t sub_code) | |
397b5bde | 1362 | { |
d62a17ae | 1363 | /* Send notify to remote peer */ |
1364 | bgp_notify_send(peer, code, sub_code); | |
1365 | ||
1366 | if (peer_dynamic_neighbor(peer)) { | |
1367 | if (bgp_debug_neighbor_events(peer)) | |
1368 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1369 | peer_delete(peer); | |
1370 | return -1; | |
1371 | } | |
f14e6fdb | 1372 | |
d62a17ae | 1373 | /* Clear start timer value to default. */ |
1374 | peer->v_start = BGP_INIT_START_TIMER; | |
397b5bde | 1375 | |
d62a17ae | 1376 | return (bgp_stop(peer)); |
397b5bde LR |
1377 | } |
1378 | ||
07a16526 QY |
1379 | /** |
1380 | * Determines whether a TCP session has successfully established for a peer and | |
1381 | * events as appropriate. | |
1382 | * | |
1383 | * This function is called when setting up a new session. After connect() is | |
387f984e QY |
1384 | * called on the peer's socket (in bgp_start()), the fd is passed to poll() |
1385 | * to wait for connection success or failure. When poll() returns, this | |
07a16526 | 1386 | * function is called to evaluate the result. |
387f984e QY |
1387 | * |
1388 | * Due to differences in behavior of poll() on Linux and BSD - specifically, | |
1389 | * the value of .revents in the case of a closed connection - this function is | |
1390 | * scheduled both for a read and a write event. The write event is triggered | |
1391 | * when the connection is established. A read event is triggered when the | |
1392 | * connection is closed. Thus we need to cancel whichever one did not occur. | |
07a16526 QY |
1393 | */ |
1394 | static int bgp_connect_check(struct thread *thread) | |
1395 | { | |
1396 | int status; | |
1397 | socklen_t slen; | |
1398 | int ret; | |
1399 | struct peer *peer; | |
1400 | ||
1401 | peer = THREAD_ARG(thread); | |
424ab01d QY |
1402 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); |
1403 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); | |
1404 | assert(!peer->t_read); | |
1405 | assert(!peer->t_write); | |
07a16526 | 1406 | |
387f984e QY |
1407 | THREAD_OFF(peer->t_connect_check_r); |
1408 | THREAD_OFF(peer->t_connect_check_w); | |
dc1188bb | 1409 | |
07a16526 QY |
1410 | /* Check file descriptor. */ |
1411 | slen = sizeof(status); | |
1412 | ret = getsockopt(peer->fd, SOL_SOCKET, SO_ERROR, (void *)&status, | |
1413 | &slen); | |
1414 | ||
1415 | /* If getsockopt is fail, this is fatal error. */ | |
1416 | if (ret < 0) { | |
4cb5e18b | 1417 | zlog_err("can't get sockopt for nonblocking connect: %d(%s)", |
54ff5e9b | 1418 | errno, safe_strerror(errno)); |
07a16526 QY |
1419 | BGP_EVENT_ADD(peer, TCP_fatal_error); |
1420 | return -1; | |
1421 | } | |
1422 | ||
1423 | /* When status is 0 then TCP connection is established. */ | |
1424 | if (status == 0) { | |
1425 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
1426 | return 1; | |
1427 | } else { | |
1428 | if (bgp_debug_neighbor_events(peer)) | |
54ff5e9b DS |
1429 | zlog_debug("%s [Event] Connect failed %d(%s)", |
1430 | peer->host, status, safe_strerror(status)); | |
07a16526 QY |
1431 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); |
1432 | return 0; | |
1433 | } | |
1434 | } | |
397b5bde | 1435 | |
718e3744 | 1436 | /* TCP connection open. Next we send open message to remote peer. And |
1437 | add read thread for reading open message. */ | |
d62a17ae | 1438 | static int bgp_connect_success(struct peer *peer) |
718e3744 | 1439 | { |
d62a17ae | 1440 | if (peer->fd < 0) { |
e50f7cfd | 1441 | flog_err(EC_BGP_CONNECT, |
1c50c1c0 QY |
1442 | "bgp_connect_success peer's fd is negative value %d", |
1443 | peer->fd); | |
d62a17ae | 1444 | bgp_stop(peer); |
1445 | return -1; | |
1446 | } | |
1447 | ||
1448 | if (bgp_getsockname(peer) < 0) { | |
450971aa | 1449 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 QY |
1450 | "%s: bgp_getsockname(): failed for peer %s, fd %d", |
1451 | __FUNCTION__, peer->host, peer->fd); | |
0e35025e DA |
1452 | bgp_notify_send( |
1453 | peer, BGP_NOTIFY_FSM_ERR, | |
1454 | BGP_NOTIFY_SUBCODE_UNSPECIFIC); /* internal error */ | |
424ab01d | 1455 | bgp_writes_on(peer); |
d62a17ae | 1456 | return -1; |
1457 | } | |
1458 | ||
424ab01d | 1459 | bgp_reads_on(peer); |
d62a17ae | 1460 | |
1461 | if (bgp_debug_neighbor_events(peer)) { | |
1462 | char buf1[SU_ADDRSTRLEN]; | |
1463 | ||
1464 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) | |
1465 | zlog_debug("%s open active, local address %s", | |
1466 | peer->host, | |
1467 | sockunion2str(peer->su_local, buf1, | |
1468 | SU_ADDRSTRLEN)); | |
1469 | else | |
1470 | zlog_debug("%s passive open", peer->host); | |
1471 | } | |
1472 | ||
1473 | bgp_open_send(peer); | |
1474 | ||
1475 | return 0; | |
718e3744 | 1476 | } |
1477 | ||
1478 | /* TCP connect fail */ | |
d62a17ae | 1479 | static int bgp_connect_fail(struct peer *peer) |
718e3744 | 1480 | { |
d62a17ae | 1481 | if (peer_dynamic_neighbor(peer)) { |
1482 | if (bgp_debug_neighbor_events(peer)) | |
1483 | zlog_debug("%s (dynamic neighbor) deleted", peer->host); | |
1484 | peer_delete(peer); | |
1485 | return -1; | |
1486 | } | |
1487 | ||
1488 | return (bgp_stop(peer)); | |
718e3744 | 1489 | } |
1490 | ||
1491 | /* This function is the first starting point of all BGP connection. It | |
1492 | try to connect to remote peer with non-blocking IO. */ | |
d62a17ae | 1493 | int bgp_start(struct peer *peer) |
718e3744 | 1494 | { |
d62a17ae | 1495 | int status; |
d62a17ae | 1496 | |
1497 | bgp_peer_conf_if_to_su_update(peer); | |
1498 | ||
1499 | if (peer->su.sa.sa_family == AF_UNSPEC) { | |
1500 | if (bgp_debug_neighbor_events(peer)) | |
1501 | zlog_debug( | |
1502 | "%s [FSM] Unable to get neighbor's IP address, waiting...", | |
1503 | peer->host); | |
3577f1c5 | 1504 | peer->last_reset = PEER_DOWN_NBR_ADDR; |
d62a17ae | 1505 | return -1; |
1506 | } | |
1507 | ||
1508 | if (BGP_PEER_START_SUPPRESSED(peer)) { | |
1509 | if (bgp_debug_neighbor_events(peer)) | |
e50f7cfd | 1510 | flog_err(EC_BGP_FSM, |
1c50c1c0 QY |
1511 | "%s [FSM] Trying to start suppressed peer" |
1512 | " - this is never supposed to happen!", | |
1513 | peer->host); | |
d62a17ae | 1514 | return -1; |
1515 | } | |
1516 | ||
1517 | /* Scrub some information that might be left over from a previous, | |
1518 | * session | |
1519 | */ | |
1520 | /* Connection information. */ | |
1521 | if (peer->su_local) { | |
1522 | sockunion_free(peer->su_local); | |
1523 | peer->su_local = NULL; | |
1524 | } | |
1525 | ||
1526 | if (peer->su_remote) { | |
1527 | sockunion_free(peer->su_remote); | |
1528 | peer->su_remote = NULL; | |
1529 | } | |
1530 | ||
1531 | /* Clear remote router-id. */ | |
1532 | peer->remote_id.s_addr = 0; | |
1533 | ||
1534 | /* Clear peer capability flag. */ | |
1535 | peer->cap = 0; | |
1536 | ||
1537 | /* If the peer is passive mode, force to move to Active mode. */ | |
1538 | if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE)) { | |
1539 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1540 | return 0; | |
1541 | } | |
1542 | ||
dded74d5 DS |
1543 | if (peer->bgp->inst_type != BGP_INSTANCE_TYPE_VIEW && |
1544 | peer->bgp->vrf_id == VRF_UNKNOWN) { | |
61cf4b37 | 1545 | if (bgp_debug_neighbor_events(peer)) |
af4c2728 | 1546 | flog_err( |
e50f7cfd | 1547 | EC_BGP_FSM, |
996c9314 LB |
1548 | "%s [FSM] In a VRF that is not initialised yet", |
1549 | peer->host); | |
3577f1c5 | 1550 | peer->last_reset = PEER_DOWN_VRF_UNINIT; |
61cf4b37 PG |
1551 | return -1; |
1552 | } | |
1553 | ||
e2d3a909 | 1554 | /* Register peer for NHT. If next hop is already resolved, proceed |
1555 | * with connection setup, else wait. | |
1556 | */ | |
1557 | if (!bgp_peer_reg_with_nht(peer)) { | |
c42eab4b DS |
1558 | if (bgp_zebra_num_connects()) { |
1559 | if (bgp_debug_neighbor_events(peer)) | |
1560 | zlog_debug("%s [FSM] Waiting for NHT", | |
1561 | peer->host); | |
3577f1c5 | 1562 | peer->last_reset = PEER_DOWN_WAITING_NHT; |
c42eab4b DS |
1563 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); |
1564 | return 0; | |
1565 | } | |
718e3744 | 1566 | } |
d62a17ae | 1567 | |
424ab01d QY |
1568 | assert(!peer->t_write); |
1569 | assert(!peer->t_read); | |
1570 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); | |
1571 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); | |
d62a17ae | 1572 | status = bgp_connect(peer); |
1573 | ||
1574 | switch (status) { | |
1575 | case connect_error: | |
1576 | if (bgp_debug_neighbor_events(peer)) | |
1577 | zlog_debug("%s [FSM] Connect error", peer->host); | |
1578 | BGP_EVENT_ADD(peer, TCP_connection_open_failed); | |
1579 | break; | |
1580 | case connect_success: | |
1581 | if (bgp_debug_neighbor_events(peer)) | |
1582 | zlog_debug( | |
1583 | "%s [FSM] Connect immediately success, fd %d", | |
1584 | peer->host, peer->fd); | |
1585 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
1586 | break; | |
1587 | case connect_in_progress: | |
1588 | /* To check nonblocking connect, we wait until socket is | |
1589 | readable or writable. */ | |
1590 | if (bgp_debug_neighbor_events(peer)) | |
1591 | zlog_debug( | |
1592 | "%s [FSM] Non blocking connect waiting result, fd %d", | |
1593 | peer->host, peer->fd); | |
1594 | if (peer->fd < 0) { | |
e50f7cfd | 1595 | flog_err(EC_BGP_FSM, |
1c50c1c0 QY |
1596 | "bgp_start peer's fd is negative value %d", |
1597 | peer->fd); | |
d62a17ae | 1598 | return -1; |
1599 | } | |
becedef6 | 1600 | /* |
387f984e QY |
1601 | * - when the socket becomes ready, poll() will signify POLLOUT |
1602 | * - if it fails to connect, poll() will signify POLLHUP | |
1603 | * - POLLHUP is handled as a 'read' event by thread.c | |
1604 | * | |
1605 | * therefore, we schedule both a read and a write event with | |
1606 | * bgp_connect_check() as the handler for each and cancel the | |
1607 | * unused event in that function. | |
becedef6 | 1608 | */ |
424ab01d | 1609 | thread_add_read(bm->master, bgp_connect_check, peer, peer->fd, |
387f984e QY |
1610 | &peer->t_connect_check_r); |
1611 | thread_add_write(bm->master, bgp_connect_check, peer, peer->fd, | |
1612 | &peer->t_connect_check_w); | |
d62a17ae | 1613 | break; |
1614 | } | |
1615 | return 0; | |
718e3744 | 1616 | } |
1617 | ||
1618 | /* Connect retry timer is expired when the peer status is Connect. */ | |
d62a17ae | 1619 | static int bgp_reconnect(struct peer *peer) |
718e3744 | 1620 | { |
d62a17ae | 1621 | if (bgp_stop(peer) < 0) |
1622 | return -1; | |
1ff9a340 | 1623 | |
8c48b3b6 | 1624 | /* Send graceful restart capabilty */ |
1625 | BGP_GR_ROUTER_DETECT_AND_SEND_CAPABILITY_TO_ZEBRA( | |
1626 | peer->bgp, peer->bgp->peer); | |
1627 | ||
d62a17ae | 1628 | bgp_start(peer); |
1629 | return 0; | |
718e3744 | 1630 | } |
1631 | ||
d62a17ae | 1632 | static int bgp_fsm_open(struct peer *peer) |
718e3744 | 1633 | { |
d62a17ae | 1634 | /* Send keepalive and make keepalive timer */ |
1635 | bgp_keepalive_send(peer); | |
718e3744 | 1636 | |
d62a17ae | 1637 | /* Reset holdtimer value. */ |
1638 | BGP_TIMER_OFF(peer->t_holdtime); | |
718e3744 | 1639 | |
d62a17ae | 1640 | return 0; |
718e3744 | 1641 | } |
1642 | ||
397b5bde LR |
1643 | /* FSM error, unexpected event. This is error of BGP connection. So cut the |
1644 | peer and change to Idle status. */ | |
d62a17ae | 1645 | static int bgp_fsm_event_error(struct peer *peer) |
397b5bde | 1646 | { |
1c50c1c0 QY |
1647 | flog_err(EC_BGP_FSM, "%s [FSM] unexpected packet received in state %s", |
1648 | peer->host, lookup_msg(bgp_status_msg, peer->status, NULL)); | |
397b5bde | 1649 | |
d62a17ae | 1650 | return bgp_stop_with_notify(peer, BGP_NOTIFY_FSM_ERR, 0); |
397b5bde LR |
1651 | } |
1652 | ||
718e3744 | 1653 | /* Hold timer expire. This is error of BGP connection. So cut the |
1654 | peer and change to Idle status. */ | |
d62a17ae | 1655 | static int bgp_fsm_holdtime_expire(struct peer *peer) |
718e3744 | 1656 | { |
d62a17ae | 1657 | if (bgp_debug_neighbor_events(peer)) |
1658 | zlog_debug("%s [FSM] Hold timer expire", peer->host); | |
718e3744 | 1659 | |
d62a17ae | 1660 | return bgp_stop_with_notify(peer, BGP_NOTIFY_HOLD_ERR, 0); |
718e3744 | 1661 | } |
1662 | ||
f009ff26 | 1663 | /* Start the selection deferral timer thread for the specified AFI, SAFI */ |
1664 | static int bgp_start_deferral_timer(struct bgp *bgp, afi_t afi, safi_t safi, | |
1665 | struct graceful_restart_info *gr_info) | |
1666 | { | |
1667 | struct afi_safi_info *thread_info; | |
1668 | ||
1669 | /* If the deferral timer is active, then increment eor count */ | |
1670 | if (gr_info->t_select_deferral) { | |
1671 | gr_info->eor_required++; | |
1672 | return 0; | |
1673 | } | |
1674 | ||
1675 | /* Start the deferral timer when the first peer enabled for the graceful | |
1676 | * restart is established | |
1677 | */ | |
1678 | if (gr_info->eor_required == 0) { | |
1679 | thread_info = XMALLOC(MTYPE_TMP, sizeof(struct afi_safi_info)); | |
1680 | if (thread_info == NULL) { | |
1681 | if (BGP_DEBUG(update, UPDATE_OUT)) | |
1682 | zlog_debug("%s : Error allocating thread info", | |
1683 | __func__); | |
1684 | return -1; | |
1685 | } | |
1686 | ||
1687 | thread_info->afi = afi; | |
1688 | thread_info->safi = safi; | |
1689 | thread_info->bgp = bgp; | |
1690 | ||
1691 | thread_add_timer(bm->master, | |
1692 | bgp_graceful_deferral_timer_expire, | |
1693 | thread_info, bgp->select_defer_time, | |
1694 | &gr_info->t_select_deferral); | |
1695 | if (gr_info->t_select_deferral == NULL) { | |
1696 | if (BGP_DEBUG(update, UPDATE_OUT)) | |
1697 | zlog_debug("Error starting deferral timer for %s", | |
1698 | get_afi_safi_str(afi, safi, false)); | |
1699 | return -1; | |
1700 | } | |
1701 | } | |
f009ff26 | 1702 | gr_info->eor_required++; |
8c48b3b6 | 1703 | /* Send message to RIB indicating route update pending */ |
1704 | if (gr_info->af_enabled[afi][safi] == false) { | |
1705 | gr_info->af_enabled[afi][safi] = true; | |
1706 | /* Send message to RIB */ | |
1707 | bgp_zebra_update(afi, safi, bgp->vrf_id, | |
1708 | ZEBRA_CLIENT_ROUTE_UPDATE_PENDING); | |
1709 | } | |
f009ff26 | 1710 | if (BGP_DEBUG(update, UPDATE_OUT)) |
1711 | zlog_debug("Started the deferral timer for %s eor_required %d", | |
1712 | get_afi_safi_str(afi, safi, false), | |
1713 | gr_info->eor_required); | |
1714 | return 0; | |
1715 | } | |
1716 | ||
1717 | /* Update the graceful restart information for the specified AFI, SAFI */ | |
1718 | static int bgp_update_gr_info(struct peer *peer, afi_t afi, safi_t safi) | |
1719 | { | |
1720 | struct graceful_restart_info *gr_info; | |
1721 | struct bgp *bgp = peer->bgp; | |
1722 | int ret = 0; | |
1723 | ||
1724 | if ((afi < AFI_IP) || (afi >= AFI_MAX)) { | |
1725 | if (BGP_DEBUG(update, UPDATE_OUT)) | |
1726 | zlog_debug("%s : invalid afi %d", __func__, afi); | |
1727 | return -1; | |
1728 | } | |
1729 | ||
1730 | if ((safi < SAFI_UNICAST) || (safi > SAFI_MPLS_VPN)) { | |
1731 | if (BGP_DEBUG(update, UPDATE_OUT)) | |
1732 | zlog_debug("%s : invalid safi %d", __func__, safi); | |
1733 | return -1; | |
1734 | } | |
1735 | ||
1736 | /* Restarting router */ | |
1737 | if (BGP_PEER_GRACEFUL_RESTART_CAPABLE(peer) && | |
1738 | BGP_PEER_RESTARTING_MODE(peer)) { | |
1739 | /* Check if the forwarding state is preserved */ | |
1740 | if (bgp_flag_check(bgp, BGP_FLAG_GR_PRESERVE_FWD)) { | |
1741 | gr_info = &(bgp->gr_info[afi][safi]); | |
1742 | ret = bgp_start_deferral_timer(bgp, afi, safi, gr_info); | |
1743 | } | |
1744 | } | |
2ba1fe69 | 1745 | return ret; |
f009ff26 | 1746 | } |
1747 | ||
727c4f87 QY |
1748 | /** |
1749 | * Transition to Established state. | |
1750 | * | |
1751 | * Convert peer from stub to full fledged peer, set some timers, and generate | |
1752 | * initial updates. | |
1753 | */ | |
d62a17ae | 1754 | static int bgp_establish(struct peer *peer) |
718e3744 | 1755 | { |
d62a17ae | 1756 | afi_t afi; |
1757 | safi_t safi; | |
1758 | int nsf_af_count = 0; | |
1759 | int ret = 0; | |
1760 | struct peer *other; | |
f009ff26 | 1761 | int status; |
d62a17ae | 1762 | |
1763 | other = peer->doppelganger; | |
1764 | peer = peer_xfer_conn(peer); | |
1765 | if (!peer) { | |
e50f7cfd | 1766 | flog_err(EC_BGP_CONNECT, "%%Neighbor failed in xfer_conn"); |
d62a17ae | 1767 | return -1; |
93406d87 | 1768 | } |
93406d87 | 1769 | |
d62a17ae | 1770 | if (other == peer) |
996c9314 LB |
1771 | ret = 1; /* bgp_establish specific code when xfer_conn |
1772 | happens. */ | |
d62a17ae | 1773 | |
1774 | /* Reset capability open status flag. */ | |
1775 | if (!CHECK_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN)) | |
1776 | SET_FLAG(peer->sflags, PEER_STATUS_CAPABILITY_OPEN); | |
1777 | ||
1778 | /* Clear start timer value to default. */ | |
1779 | peer->v_start = BGP_INIT_START_TIMER; | |
1780 | ||
1781 | /* Increment established count. */ | |
1782 | peer->established++; | |
1783 | bgp_fsm_change_status(peer, Established); | |
1784 | ||
1785 | /* bgp log-neighbor-changes of neighbor Up */ | |
1786 | if (bgp_flag_check(peer->bgp, BGP_FLAG_LOG_NEIGHBOR_CHANGES)) { | |
1787 | struct vrf *vrf = vrf_lookup_by_id(peer->bgp->vrf_id); | |
1788 | zlog_info("%%ADJCHANGE: neighbor %s(%s) in vrf %s Up", | |
1789 | peer->host, | |
1790 | (peer->hostname) ? peer->hostname : "Unknown", | |
5742e42b DS |
1791 | vrf ? ((vrf->vrf_id != VRF_DEFAULT) |
1792 | ? vrf->name | |
1793 | : VRF_DEFAULT_NAME) | |
d62a17ae | 1794 | : ""); |
1795 | } | |
1796 | /* assign update-group/subgroup */ | |
1797 | update_group_adjust_peer_afs(peer); | |
1798 | ||
1799 | /* graceful restart */ | |
1800 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT); | |
f009ff26 | 1801 | if (bgp_debug_neighbor_events(peer)) { |
1802 | if (BGP_PEER_RESTARTING_MODE(peer)) | |
1803 | zlog_debug("peer %s BGP_RESTARTING_MODE", | |
1804 | peer->host); | |
1805 | else if (BGP_PEER_HELPER_MODE(peer)) | |
1806 | zlog_debug("peer %s BGP_HELPER_MODE", | |
1807 | peer->host); | |
1808 | } | |
d62a17ae | 1809 | for (afi = AFI_IP; afi < AFI_MAX; afi++) |
a08ca0a7 | 1810 | for (safi = SAFI_UNICAST; safi <= SAFI_MPLS_VPN; safi++) { |
d62a17ae | 1811 | if (peer->afc_nego[afi][safi] |
1812 | && CHECK_FLAG(peer->cap, PEER_CAP_RESTART_ADV) | |
1813 | && CHECK_FLAG(peer->af_cap[afi][safi], | |
1814 | PEER_CAP_RESTART_AF_RCV)) { | |
1815 | if (peer->nsf[afi][safi] | |
1816 | && !CHECK_FLAG( | |
1817 | peer->af_cap[afi][safi], | |
1818 | PEER_CAP_RESTART_AF_PRESERVE_RCV)) | |
1819 | bgp_clear_stale_route(peer, afi, safi); | |
1820 | ||
1821 | peer->nsf[afi][safi] = 1; | |
1822 | nsf_af_count++; | |
1823 | } else { | |
1824 | if (peer->nsf[afi][safi]) | |
1825 | bgp_clear_stale_route(peer, afi, safi); | |
1826 | peer->nsf[afi][safi] = 0; | |
1827 | } | |
f009ff26 | 1828 | /* Update the graceful restart information */ |
1829 | if (peer->afc_nego[afi][safi]) { | |
1830 | if (!BGP_SELECT_DEFER_DISABLE(peer->bgp)) { | |
1831 | status = bgp_update_gr_info(peer, afi, | |
1832 | safi); | |
1833 | if (status < 0) | |
2ba1fe69 | 1834 | zlog_err("Error in updating graceful restart for %s", |
1835 | get_afi_safi_str(afi, | |
9e3b51a7 | 1836 | safi, false)); |
1837 | } else { | |
1838 | if (BGP_PEER_GRACEFUL_RESTART_CAPABLE( | |
1839 | peer) && | |
1840 | BGP_PEER_RESTARTING_MODE(peer) | |
1841 | && bgp_flag_check(peer->bgp, | |
1842 | BGP_FLAG_GR_PRESERVE_FWD)) | |
1843 | peer->bgp->gr_info[afi][safi] | |
1844 | .eor_required++; | |
f009ff26 | 1845 | } |
1846 | } | |
d62a17ae | 1847 | } |
1848 | ||
794b37d5 | 1849 | peer->nsf_af_count = nsf_af_count; |
1850 | ||
d62a17ae | 1851 | if (nsf_af_count) |
1852 | SET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1853 | else { | |
1854 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
1855 | if (peer->t_gr_stale) { | |
1856 | BGP_TIMER_OFF(peer->t_gr_stale); | |
1857 | if (bgp_debug_neighbor_events(peer)) | |
1858 | zlog_debug( | |
1859 | "%s graceful restart stalepath timer stopped", | |
1860 | peer->host); | |
1861 | } | |
1862 | } | |
93406d87 | 1863 | |
d62a17ae | 1864 | if (peer->t_gr_restart) { |
1865 | BGP_TIMER_OFF(peer->t_gr_restart); | |
1866 | if (bgp_debug_neighbor_events(peer)) | |
1867 | zlog_debug("%s graceful restart timer stopped", | |
1868 | peer->host); | |
1869 | } | |
718e3744 | 1870 | |
9eb217ff QY |
1871 | /* Reset uptime, turn on keepalives, send current table. */ |
1872 | if (!peer->v_holdtime) | |
1873 | bgp_keepalives_on(peer); | |
1874 | ||
d62a17ae | 1875 | peer->uptime = bgp_clock(); |
1876 | ||
1877 | /* Send route-refresh when ORF is enabled */ | |
05c7a1cc QY |
1878 | FOREACH_AFI_SAFI (afi, safi) { |
1879 | if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1880 | PEER_CAP_ORF_PREFIX_SM_ADV)) { | |
d62a17ae | 1881 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc QY |
1882 | PEER_CAP_ORF_PREFIX_RM_RCV)) |
1883 | bgp_route_refresh_send(peer, afi, safi, | |
1884 | ORF_TYPE_PREFIX, | |
1885 | REFRESH_IMMEDIATE, 0); | |
1886 | else if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1887 | PEER_CAP_ORF_PREFIX_RM_OLD_RCV)) | |
1888 | bgp_route_refresh_send(peer, afi, safi, | |
1889 | ORF_TYPE_PREFIX_OLD, | |
1890 | REFRESH_IMMEDIATE, 0); | |
1891 | } | |
1892 | } | |
d62a17ae | 1893 | |
1894 | /* First update is deferred until ORF or ROUTE-REFRESH is received */ | |
05c7a1cc QY |
1895 | FOREACH_AFI_SAFI (afi, safi) { |
1896 | if (CHECK_FLAG(peer->af_cap[afi][safi], | |
1897 | PEER_CAP_ORF_PREFIX_RM_ADV)) | |
d62a17ae | 1898 | if (CHECK_FLAG(peer->af_cap[afi][safi], |
05c7a1cc QY |
1899 | PEER_CAP_ORF_PREFIX_SM_RCV) |
1900 | || CHECK_FLAG(peer->af_cap[afi][safi], | |
1901 | PEER_CAP_ORF_PREFIX_SM_OLD_RCV)) | |
1902 | SET_FLAG(peer->af_sflags[afi][safi], | |
1903 | PEER_STATUS_ORF_WAIT_REFRESH); | |
1904 | } | |
d62a17ae | 1905 | |
1906 | bgp_announce_peer(peer); | |
1907 | ||
1908 | /* Start the route advertisement timer to send updates to the peer - if | |
1909 | * BGP | |
1910 | * is not in read-only mode. If it is, the timer will be started at the | |
1911 | * end | |
1912 | * of read-only mode. | |
1913 | */ | |
1914 | if (!bgp_update_delay_active(peer->bgp)) { | |
1915 | BGP_TIMER_OFF(peer->t_routeadv); | |
1916 | BGP_TIMER_ON(peer->t_routeadv, bgp_routeadv_timer, 0); | |
1917 | } | |
718e3744 | 1918 | |
d62a17ae | 1919 | if (peer->doppelganger && (peer->doppelganger->status != Deleted)) { |
1920 | if (bgp_debug_neighbor_events(peer)) | |
1921 | zlog_debug( | |
1922 | "[Event] Deleting stub connection for peer %s", | |
1923 | peer->host); | |
1924 | ||
1925 | if (peer->doppelganger->status > Active) | |
1926 | bgp_notify_send(peer->doppelganger, BGP_NOTIFY_CEASE, | |
1927 | BGP_NOTIFY_CEASE_COLLISION_RESOLUTION); | |
1928 | else | |
1929 | peer_delete(peer->doppelganger); | |
718e3744 | 1930 | } |
1931 | ||
19bd3dff DS |
1932 | /* |
1933 | * If we are replacing the old peer for a doppelganger | |
1934 | * then switch it around in the bgp->peerhash | |
1935 | * the doppelgangers su and this peer's su are the same | |
1936 | * so the hash_release is the same for either. | |
1937 | */ | |
1938 | hash_release(peer->bgp->peerhash, peer); | |
1939 | hash_get(peer->bgp->peerhash, peer, hash_alloc_intern); | |
1940 | ||
d62a17ae | 1941 | bgp_bfd_register_peer(peer); |
1942 | return ret; | |
718e3744 | 1943 | } |
1944 | ||
1945 | /* Keepalive packet is received. */ | |
d62a17ae | 1946 | static int bgp_fsm_keepalive(struct peer *peer) |
718e3744 | 1947 | { |
d62a17ae | 1948 | BGP_TIMER_OFF(peer->t_holdtime); |
1949 | return 0; | |
718e3744 | 1950 | } |
1951 | ||
1952 | /* Update packet is received. */ | |
d62a17ae | 1953 | static int bgp_fsm_update(struct peer *peer) |
718e3744 | 1954 | { |
d62a17ae | 1955 | BGP_TIMER_OFF(peer->t_holdtime); |
1956 | return 0; | |
718e3744 | 1957 | } |
1958 | ||
1959 | /* This is empty event. */ | |
d62a17ae | 1960 | static int bgp_ignore(struct peer *peer) |
718e3744 | 1961 | { |
af4c2728 | 1962 | flog_err( |
e50f7cfd | 1963 | EC_BGP_FSM, |
d62a17ae | 1964 | "%s [FSM] Ignoring event %s in state %s, prior events %s, %s, fd %d", |
1965 | peer->host, bgp_event_str[peer->cur_event], | |
1966 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1967 | bgp_event_str[peer->last_event], | |
1968 | bgp_event_str[peer->last_major_event], peer->fd); | |
1969 | return 0; | |
718e3744 | 1970 | } |
6b0655a2 | 1971 | |
6403814c | 1972 | /* This is to handle unexpected events.. */ |
d62a17ae | 1973 | static int bgp_fsm_exeption(struct peer *peer) |
6403814c | 1974 | { |
af4c2728 | 1975 | flog_err( |
e50f7cfd | 1976 | EC_BGP_FSM, |
d62a17ae | 1977 | "%s [FSM] Unexpected event %s in state %s, prior events %s, %s, fd %d", |
1978 | peer->host, bgp_event_str[peer->cur_event], | |
1979 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
1980 | bgp_event_str[peer->last_event], | |
1981 | bgp_event_str[peer->last_major_event], peer->fd); | |
1982 | return (bgp_stop(peer)); | |
6403814c DS |
1983 | } |
1984 | ||
fc04a677 | 1985 | void bgp_fsm_event_update(struct peer *peer, int valid) |
fc9a856f | 1986 | { |
d62a17ae | 1987 | if (!peer) |
1988 | return; | |
1989 | ||
1990 | switch (peer->status) { | |
1991 | case Idle: | |
1992 | if (valid) | |
1993 | BGP_EVENT_ADD(peer, BGP_Start); | |
1994 | break; | |
1995 | case Connect: | |
1996 | if (!valid) { | |
1997 | BGP_TIMER_OFF(peer->t_connect); | |
1998 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
1999 | } | |
2000 | break; | |
2001 | case Active: | |
2002 | if (valid) { | |
2003 | BGP_TIMER_OFF(peer->t_connect); | |
2004 | BGP_EVENT_ADD(peer, ConnectRetry_timer_expired); | |
2005 | } | |
2006 | break; | |
2007 | case OpenSent: | |
2008 | case OpenConfirm: | |
2009 | case Established: | |
2010 | if (!valid && (peer->gtsm_hops == 1)) | |
2011 | BGP_EVENT_ADD(peer, TCP_fatal_error); | |
2012 | case Clearing: | |
2013 | case Deleted: | |
2014 | default: | |
2015 | break; | |
fc9a856f | 2016 | } |
fc9a856f DS |
2017 | } |
2018 | ||
718e3744 | 2019 | /* Finite State Machine structure */ |
fda1d3e0 | 2020 | static const struct { |
d62a17ae | 2021 | int (*func)(struct peer *); |
2022 | int next_state; | |
2023 | } FSM[BGP_STATUS_MAX - 1][BGP_EVENTS_MAX - 1] = { | |
2024 | { | |
2025 | /* Idle state: In Idle state, all events other than BGP_Start is | |
2026 | ignored. With BGP_Start event, finite state machine calls | |
2027 | bgp_start(). */ | |
2028 | {bgp_start, Connect}, /* BGP_Start */ | |
2029 | {bgp_stop, Idle}, /* BGP_Stop */ | |
2030 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
2031 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
2032 | {bgp_ignore, Idle}, /* TCP_connection_open_failed */ | |
2033 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
2034 | {bgp_ignore, Idle}, /* ConnectRetry_timer_expired */ | |
2035 | {bgp_ignore, Idle}, /* Hold_Timer_expired */ | |
2036 | {bgp_ignore, Idle}, /* KeepAlive_timer_expired */ | |
2037 | {bgp_ignore, Idle}, /* Receive_OPEN_message */ | |
2038 | {bgp_ignore, Idle}, /* Receive_KEEPALIVE_message */ | |
2039 | {bgp_ignore, Idle}, /* Receive_UPDATE_message */ | |
2040 | {bgp_ignore, Idle}, /* Receive_NOTIFICATION_message */ | |
2041 | {bgp_ignore, Idle}, /* Clearing_Completed */ | |
2042 | }, | |
2043 | { | |
2044 | /* Connect */ | |
2045 | {bgp_ignore, Connect}, /* BGP_Start */ | |
2046 | {bgp_stop, Idle}, /* BGP_Stop */ | |
2047 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
2048 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
2049 | {bgp_connect_fail, Active}, /* TCP_connection_open_failed */ | |
2050 | {bgp_connect_fail, Idle}, /* TCP_fatal_error */ | |
2051 | {bgp_reconnect, Connect}, /* ConnectRetry_timer_expired */ | |
2052 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ | |
2053 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
2054 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
2055 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
2056 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
2057 | {bgp_stop, Idle}, /* Receive_NOTIFICATION_message */ | |
2058 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
2059 | }, | |
2060 | { | |
2061 | /* Active, */ | |
2062 | {bgp_ignore, Active}, /* BGP_Start */ | |
2063 | {bgp_stop, Idle}, /* BGP_Stop */ | |
2064 | {bgp_connect_success, OpenSent}, /* TCP_connection_open */ | |
2065 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
2066 | {bgp_ignore, Active}, /* TCP_connection_open_failed */ | |
2067 | {bgp_fsm_exeption, Idle}, /* TCP_fatal_error */ | |
2068 | {bgp_start, Connect}, /* ConnectRetry_timer_expired */ | |
2069 | {bgp_fsm_exeption, Idle}, /* Hold_Timer_expired */ | |
2070 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
2071 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
2072 | {bgp_fsm_exeption, Idle}, /* Receive_KEEPALIVE_message */ | |
2073 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
2074 | {bgp_fsm_exeption, Idle}, /* Receive_NOTIFICATION_message */ | |
2075 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
2076 | }, | |
2077 | { | |
2078 | /* OpenSent, */ | |
2079 | {bgp_ignore, OpenSent}, /* BGP_Start */ | |
2080 | {bgp_stop, Idle}, /* BGP_Stop */ | |
2081 | {bgp_stop, Active}, /* TCP_connection_open */ | |
2082 | {bgp_stop, Active}, /* TCP_connection_closed */ | |
2083 | {bgp_stop, Active}, /* TCP_connection_open_failed */ | |
2084 | {bgp_stop, Active}, /* TCP_fatal_error */ | |
2085 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ | |
2086 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
2087 | {bgp_fsm_exeption, Idle}, /* KeepAlive_timer_expired */ | |
2088 | {bgp_fsm_open, OpenConfirm}, /* Receive_OPEN_message */ | |
2089 | {bgp_fsm_event_error, Idle}, /* Receive_KEEPALIVE_message */ | |
2090 | {bgp_fsm_event_error, Idle}, /* Receive_UPDATE_message */ | |
53b4aaec | 2091 | {bgp_fsm_event_error, Idle}, /* Receive_NOTIFICATION_message */ |
d62a17ae | 2092 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ |
2093 | }, | |
2094 | { | |
2095 | /* OpenConfirm, */ | |
2096 | {bgp_ignore, OpenConfirm}, /* BGP_Start */ | |
2097 | {bgp_stop, Idle}, /* BGP_Stop */ | |
2098 | {bgp_stop, Idle}, /* TCP_connection_open */ | |
2099 | {bgp_stop, Idle}, /* TCP_connection_closed */ | |
2100 | {bgp_stop, Idle}, /* TCP_connection_open_failed */ | |
2101 | {bgp_stop, Idle}, /* TCP_fatal_error */ | |
2102 | {bgp_fsm_exeption, Idle}, /* ConnectRetry_timer_expired */ | |
2103 | {bgp_fsm_holdtime_expire, Idle}, /* Hold_Timer_expired */ | |
2104 | {bgp_ignore, OpenConfirm}, /* KeepAlive_timer_expired */ | |
2105 | {bgp_fsm_exeption, Idle}, /* Receive_OPEN_message */ | |
2106 | {bgp_establish, Established}, /* Receive_KEEPALIVE_message */ | |
2107 | {bgp_fsm_exeption, Idle}, /* Receive_UPDATE_message */ | |
2108 | {bgp_stop_with_error, Idle}, /* Receive_NOTIFICATION_message */ | |
2109 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
2110 | }, | |
2111 | { | |
2112 | /* Established, */ | |
2113 | {bgp_ignore, Established}, /* BGP_Start */ | |
2114 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
2115 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
2116 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
2117 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
2118 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
2119 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
2120 | {bgp_fsm_holdtime_expire, Clearing}, /* Hold_Timer_expired */ | |
03014d48 QY |
2121 | {bgp_ignore, Established}, /* KeepAlive_timer_expired */ |
2122 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
d62a17ae | 2123 | {bgp_fsm_keepalive, |
2124 | Established}, /* Receive_KEEPALIVE_message */ | |
2125 | {bgp_fsm_update, Established}, /* Receive_UPDATE_message */ | |
2126 | {bgp_stop_with_error, | |
2127 | Clearing}, /* Receive_NOTIFICATION_message */ | |
2128 | {bgp_fsm_exeption, Idle}, /* Clearing_Completed */ | |
2129 | }, | |
2130 | { | |
2131 | /* Clearing, */ | |
2132 | {bgp_ignore, Clearing}, /* BGP_Start */ | |
2133 | {bgp_stop, Clearing}, /* BGP_Stop */ | |
2134 | {bgp_stop, Clearing}, /* TCP_connection_open */ | |
2135 | {bgp_stop, Clearing}, /* TCP_connection_closed */ | |
2136 | {bgp_stop, Clearing}, /* TCP_connection_open_failed */ | |
2137 | {bgp_stop, Clearing}, /* TCP_fatal_error */ | |
2138 | {bgp_stop, Clearing}, /* ConnectRetry_timer_expired */ | |
2139 | {bgp_stop, Clearing}, /* Hold_Timer_expired */ | |
2140 | {bgp_stop, Clearing}, /* KeepAlive_timer_expired */ | |
2141 | {bgp_stop, Clearing}, /* Receive_OPEN_message */ | |
2142 | {bgp_stop, Clearing}, /* Receive_KEEPALIVE_message */ | |
2143 | {bgp_stop, Clearing}, /* Receive_UPDATE_message */ | |
2144 | {bgp_stop, Clearing}, /* Receive_NOTIFICATION_message */ | |
2145 | {bgp_clearing_completed, Idle}, /* Clearing_Completed */ | |
2146 | }, | |
2147 | { | |
2148 | /* Deleted, */ | |
2149 | {bgp_ignore, Deleted}, /* BGP_Start */ | |
2150 | {bgp_ignore, Deleted}, /* BGP_Stop */ | |
2151 | {bgp_ignore, Deleted}, /* TCP_connection_open */ | |
2152 | {bgp_ignore, Deleted}, /* TCP_connection_closed */ | |
2153 | {bgp_ignore, Deleted}, /* TCP_connection_open_failed */ | |
2154 | {bgp_ignore, Deleted}, /* TCP_fatal_error */ | |
2155 | {bgp_ignore, Deleted}, /* ConnectRetry_timer_expired */ | |
2156 | {bgp_ignore, Deleted}, /* Hold_Timer_expired */ | |
2157 | {bgp_ignore, Deleted}, /* KeepAlive_timer_expired */ | |
2158 | {bgp_ignore, Deleted}, /* Receive_OPEN_message */ | |
2159 | {bgp_ignore, Deleted}, /* Receive_KEEPALIVE_message */ | |
2160 | {bgp_ignore, Deleted}, /* Receive_UPDATE_message */ | |
2161 | {bgp_ignore, Deleted}, /* Receive_NOTIFICATION_message */ | |
2162 | {bgp_ignore, Deleted}, /* Clearing_Completed */ | |
2163 | }, | |
718e3744 | 2164 | }; |
2165 | ||
718e3744 | 2166 | /* Execute event process. */ |
d62a17ae | 2167 | int bgp_event(struct thread *thread) |
718e3744 | 2168 | { |
d62a17ae | 2169 | int event; |
2170 | struct peer *peer; | |
2171 | int ret; | |
718e3744 | 2172 | |
d62a17ae | 2173 | peer = THREAD_ARG(thread); |
2174 | event = THREAD_VAL(thread); | |
718e3744 | 2175 | |
d62a17ae | 2176 | ret = bgp_event_update(peer, event); |
1ff9a340 | 2177 | |
d62a17ae | 2178 | return (ret); |
1ff9a340 DS |
2179 | } |
2180 | ||
d62a17ae | 2181 | int bgp_event_update(struct peer *peer, int event) |
1ff9a340 | 2182 | { |
d62a17ae | 2183 | int next; |
2184 | int ret = 0; | |
2185 | struct peer *other; | |
2186 | int passive_conn = 0; | |
2187 | int dyn_nbr; | |
2188 | ||
d8151687 QY |
2189 | /* default return code */ |
2190 | ret = FSM_PEER_NOOP; | |
2191 | ||
d62a17ae | 2192 | other = peer->doppelganger; |
2193 | passive_conn = | |
2194 | (CHECK_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER)) ? 1 : 0; | |
2195 | dyn_nbr = peer_dynamic_neighbor(peer); | |
2196 | ||
2197 | /* Logging this event. */ | |
2198 | next = FSM[peer->status - 1][event - 1].next_state; | |
2199 | ||
2200 | if (bgp_debug_neighbor_events(peer) && peer->status != next) | |
2201 | zlog_debug("%s [FSM] %s (%s->%s), fd %d", peer->host, | |
2202 | bgp_event_str[event], | |
2203 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
2204 | lookup_msg(bgp_status_msg, next, NULL), peer->fd); | |
2205 | ||
2206 | peer->last_event = peer->cur_event; | |
2207 | peer->cur_event = event; | |
2208 | ||
2209 | /* Call function. */ | |
2210 | if (FSM[peer->status - 1][event - 1].func) | |
2211 | ret = (*(FSM[peer->status - 1][event - 1].func))(peer); | |
2212 | ||
d62a17ae | 2213 | if (ret >= 0) { |
2214 | if (ret == 1 && next == Established) { | |
2215 | /* The case when doppelganger swap accurred in | |
2216 | bgp_establish. | |
2217 | Update the peer pointer accordingly */ | |
d8151687 | 2218 | ret = FSM_PEER_TRANSFERRED; |
d62a17ae | 2219 | peer = other; |
2220 | } | |
2221 | ||
2222 | /* If status is changed. */ | |
d8151687 | 2223 | if (next != peer->status) { |
d62a17ae | 2224 | bgp_fsm_change_status(peer, next); |
2225 | ||
becedef6 QY |
2226 | /* |
2227 | * If we're going to ESTABLISHED then we executed a | |
2228 | * peer transfer. In this case we can either return | |
2229 | * FSM_PEER_TRANSITIONED or FSM_PEER_TRANSFERRED. | |
2230 | * Opting for TRANSFERRED since transfer implies | |
2231 | * session establishment. | |
2232 | */ | |
d8151687 QY |
2233 | if (ret != FSM_PEER_TRANSFERRED) |
2234 | ret = FSM_PEER_TRANSITIONED; | |
2235 | } | |
2236 | ||
d62a17ae | 2237 | /* Make sure timer is set. */ |
2238 | bgp_timer_set(peer); | |
2239 | ||
bea01226 | 2240 | } else { |
becedef6 QY |
2241 | /* |
2242 | * If we got a return value of -1, that means there was an | |
2243 | * error, restart the FSM. Since bgp_stop() was called on the | |
2244 | * peer. only a few fields are safe to access here. In any case | |
2245 | * we need to indicate that the peer was stopped in the return | |
2246 | * code. | |
2247 | */ | |
bea01226 | 2248 | if (!dyn_nbr && !passive_conn && peer->bgp) { |
af4c2728 | 2249 | flog_err( |
e50f7cfd | 2250 | EC_BGP_FSM, |
bea01226 QY |
2251 | "%s [FSM] Failure handling event %s in state %s, " |
2252 | "prior events %s, %s, fd %d", | |
2253 | peer->host, bgp_event_str[peer->cur_event], | |
2254 | lookup_msg(bgp_status_msg, peer->status, NULL), | |
2255 | bgp_event_str[peer->last_event], | |
2256 | bgp_event_str[peer->last_major_event], | |
2257 | peer->fd); | |
2258 | bgp_stop(peer); | |
2259 | bgp_fsm_change_status(peer, Idle); | |
2260 | bgp_timer_set(peer); | |
2261 | } | |
2262 | ret = FSM_PEER_STOPPED; | |
d62a17ae | 2263 | } |
bea01226 | 2264 | |
d62a17ae | 2265 | return ret; |
718e3744 | 2266 | } |
794b37d5 | 2267 | /* BGP GR Code */ |
2268 | ||
2269 | int bgp_gr_lookup_n_update_all_peer(struct bgp *bgp, | |
2270 | enum global_mode global_new_state, | |
2271 | enum global_mode global_old_state) | |
2272 | { | |
2273 | struct peer *peer = {0}; | |
2274 | struct listnode *node = {0}; | |
2275 | struct listnode *nnode = {0}; | |
2276 | enum peer_mode peer_old_state = PEER_INVALID; | |
2277 | ||
2278 | for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) { | |
2279 | ||
2280 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2281 | zlog_debug( | |
2ba1fe69 | 2282 | "%s [BGP_GR] Peer: (%s) :", |
794b37d5 | 2283 | __func__, peer->host); |
2284 | ||
2285 | peer_old_state = bgp_peer_gr_mode_get(peer); | |
2286 | ||
2287 | if (peer_old_state == PEER_GLOBAL_INHERIT) { | |
2288 | ||
2289 | /* | |
2290 | *Reset only these peers and send a | |
2291 | *new open message with the change capabilities. | |
2292 | *Considering the mode to be "global_new_state" and | |
2293 | *do all operation accordingly | |
2294 | */ | |
2295 | ||
2296 | switch (global_new_state) { | |
794b37d5 | 2297 | case GLOBAL_HELPER: |
794b37d5 | 2298 | BGP_PEER_GR_HELPER_ENABLE(peer); |
2299 | break; | |
2300 | case GLOBAL_GR: | |
794b37d5 | 2301 | BGP_PEER_GR_ENABLE(peer); |
2302 | break; | |
2303 | case GLOBAL_DISABLE: | |
794b37d5 | 2304 | BGP_PEER_GR_DISABLE(peer); |
2305 | break; | |
2306 | case GLOBAL_INVALID: | |
794b37d5 | 2307 | zlog_debug( |
2ba1fe69 | 2308 | "%s [BGP_GR]GLOBAL_INVALID", |
794b37d5 | 2309 | __func__); |
2310 | return BGP_ERR_GR_OPERATION_FAILED; | |
2311 | default: | |
794b37d5 | 2312 | zlog_debug( |
2ba1fe69 | 2313 | "%s [BGP_GR]Global unknown ERROR", |
794b37d5 | 2314 | __func__); |
2315 | return BGP_ERR_GR_OPERATION_FAILED; | |
2316 | } | |
2317 | } | |
2318 | } | |
2319 | ||
2320 | bgp->global_gr_present_state = global_new_state; | |
2321 | ||
794b37d5 | 2322 | return BGP_GR_SUCCESS; |
2323 | } | |
2324 | ||
2ba1fe69 | 2325 | int bgp_gr_update_all(struct bgp *bgp, int global_gr_cmd) |
794b37d5 | 2326 | { |
2327 | enum global_mode global_new_state = GLOBAL_INVALID; | |
2328 | enum global_mode global_old_state = GLOBAL_INVALID; | |
2329 | ||
2330 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2331 | zlog_debug( | |
2ba1fe69 | 2332 | "%s [BGP_GR]START: global_gr_cmd :%s:", |
2333 | __func__, print_global_gr_cmd(global_gr_cmd)); | |
794b37d5 | 2334 | |
2335 | global_old_state = bgp_global_gr_mode_get(bgp); | |
2336 | ||
2ba1fe69 | 2337 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
2338 | zlog_debug( | |
2339 | "[BGP_GR] global_old_gr_state :%s:", | |
2340 | print_global_gr_mode(global_old_state)); | |
794b37d5 | 2341 | |
2ba1fe69 | 2342 | if (global_old_state != GLOBAL_INVALID) { |
794b37d5 | 2343 | global_new_state = |
2ba1fe69 | 2344 | bgp->GLOBAL_GR_FSM[global_old_state][global_gr_cmd]; |
2345 | ||
2346 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2347 | zlog_debug( | |
2348 | "[BGP_GR] global_new_gr_state :%s:", | |
2349 | print_global_gr_mode(global_new_state)); | |
794b37d5 | 2350 | } else { |
2ba1fe69 | 2351 | zlog_err( |
2352 | "%s [BGP_GR] global_old_state == GLOBAL_INVALID", | |
794b37d5 | 2353 | __func__); |
2354 | return BGP_ERR_GR_OPERATION_FAILED; | |
2355 | } | |
2356 | ||
2357 | if (global_new_state == GLOBAL_INVALID) { | |
2ba1fe69 | 2358 | zlog_err( |
2359 | "%s [BGP_GR] global_new_state == GLOBAL_INVALID", | |
794b37d5 | 2360 | __func__); |
2361 | return BGP_ERR_GR_INVALID_CMD; | |
2362 | } | |
2363 | if (global_new_state == global_old_state) { | |
2364 | /* Trace msg */ | |
2ba1fe69 | 2365 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
2366 | zlog_debug( | |
2367 | "%s [BGP_GR] global_new_state == global_old_state :%s", | |
2368 | __func__, print_global_gr_mode(global_new_state)); | |
794b37d5 | 2369 | return BGP_GR_NO_OPERATION; |
2370 | } | |
2371 | ||
2372 | return bgp_gr_lookup_n_update_all_peer(bgp, | |
2373 | global_new_state, | |
2374 | global_old_state); | |
2375 | } | |
2376 | ||
2ba1fe69 | 2377 | const char *print_peer_gr_mode(enum peer_mode pr_mode) |
2378 | { | |
2379 | const char *peer_gr_mode = NULL; | |
2380 | ||
2381 | switch (pr_mode) { | |
2382 | case PEER_HELPER: | |
2383 | peer_gr_mode = "PEER_HELPER"; | |
2384 | break; | |
2385 | case PEER_GR: | |
2386 | peer_gr_mode = "PEER_GR"; | |
2387 | break; | |
2388 | case PEER_DISABLE: | |
2389 | peer_gr_mode = "PEER_DISABLE"; | |
2390 | break; | |
2391 | case PEER_INVALID: | |
2392 | peer_gr_mode = "PEER_INVALID"; | |
2393 | break; | |
2394 | case PEER_GLOBAL_INHERIT: | |
2395 | peer_gr_mode = "PEER_GLOBAL_INHERIT"; | |
2396 | break; | |
2397 | } | |
2398 | ||
2399 | return peer_gr_mode; | |
2400 | } | |
2401 | ||
2402 | const char *print_peer_gr_cmd(enum peer_gr_command pr_gr_cmd) | |
2403 | { | |
2404 | const char *peer_gr_cmd = NULL; | |
2405 | ||
2406 | switch (pr_gr_cmd) { | |
2407 | case PEER_GR_CMD: | |
2408 | peer_gr_cmd = "PEER_GR_CMD"; | |
2409 | break; | |
2410 | case NO_PEER_GR_CMD: | |
2411 | peer_gr_cmd = "NO_PEER_GR_CMD"; | |
2412 | break; | |
2413 | case PEER_DISABLE_CMD: | |
2414 | peer_gr_cmd = "PEER_GR_CMD"; | |
2415 | break; | |
2416 | case NO_PEER_DISABLE_CMD: | |
2417 | peer_gr_cmd = "NO_PEER_GR_CMD"; | |
2418 | break; | |
2419 | case PEER_HELPER_CMD: | |
2420 | peer_gr_cmd = "PEER_HELPER_CMD"; | |
2421 | break; | |
2422 | case NO_PEER_HELPER_CMD: | |
2423 | peer_gr_cmd = "NO_PEER_HELPER_CMD"; | |
2424 | break; | |
2425 | } | |
2426 | ||
2427 | return peer_gr_cmd; | |
2428 | } | |
2429 | ||
2430 | const char *print_global_gr_mode(enum global_mode gl_mode) | |
2431 | { | |
2432 | const char *global_gr_mode = NULL; | |
2433 | ||
2434 | switch (gl_mode) { | |
2435 | case GLOBAL_HELPER: | |
2436 | global_gr_mode = "GLOBAL_HELPER"; | |
2437 | break; | |
2438 | case GLOBAL_GR: | |
2439 | global_gr_mode = "GLOBAL_GR"; | |
2440 | break; | |
2441 | case GLOBAL_DISABLE: | |
2442 | global_gr_mode = "GLOBAL_DISABLE"; | |
2443 | break; | |
2444 | case GLOBAL_INVALID: | |
2445 | global_gr_mode = "GLOBAL_INVALID"; | |
2446 | break; | |
2447 | } | |
2448 | ||
2449 | return global_gr_mode; | |
2450 | } | |
2451 | ||
2452 | const char *print_global_gr_cmd(enum global_gr_command gl_gr_cmd) | |
2453 | { | |
2454 | const char *global_gr_cmd = NULL; | |
2455 | ||
2456 | switch (gl_gr_cmd) { | |
2457 | case GLOBAL_GR_CMD: | |
2458 | global_gr_cmd = "GLOBAL_GR_CMD"; | |
2459 | break; | |
2460 | case NO_GLOBAL_GR_CMD: | |
2461 | global_gr_cmd = "NO_GLOBAL_GR_CMD"; | |
2462 | break; | |
2463 | case GLOBAL_DISABLE_CMD: | |
2464 | global_gr_cmd = "GLOBAL_DISABLE_CMD"; | |
2465 | break; | |
2466 | case NO_GLOBAL_DISABLE_CMD: | |
2467 | global_gr_cmd = "NO_GLOBAL_DISABLE_CMD"; | |
2468 | break; | |
2469 | } | |
2470 | ||
2471 | return global_gr_cmd; | |
2472 | } | |
2473 | ||
794b37d5 | 2474 | enum global_mode bgp_global_gr_mode_get(struct bgp *bgp) |
2475 | { | |
2476 | return bgp->global_gr_present_state; | |
2477 | } | |
2478 | ||
2479 | enum peer_mode bgp_peer_gr_mode_get(struct peer *peer) | |
2480 | { | |
2481 | return peer->peer_gr_present_state; | |
2482 | } | |
2483 | ||
2484 | int bgp_neighbor_graceful_restart(struct peer *peer, | |
2ba1fe69 | 2485 | int peer_gr_cmd) |
794b37d5 | 2486 | { |
2487 | enum peer_mode peer_new_state = PEER_INVALID; | |
2488 | enum peer_mode peer_old_state = PEER_INVALID; | |
2489 | struct bgp_peer_gr peer_state; | |
2490 | int result = BGP_GR_FAILURE; | |
2491 | ||
2492 | /* | |
2493 | * fetch peer_old_state from peer structure also | |
2494 | * fetch global_old_state from bgp structure, | |
2495 | * peer had a back pointer to bgpo struct ; | |
2496 | */ | |
2497 | ||
2498 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2499 | zlog_debug( | |
2ba1fe69 | 2500 | "%s [BGP_GR] START:Peer: (%s) : peer_gr_cmd :%s:", |
2501 | __func__, peer->host, print_peer_gr_cmd(peer_gr_cmd)); | |
794b37d5 | 2502 | |
2503 | peer_old_state = bgp_peer_gr_mode_get(peer); | |
2504 | ||
2505 | if (peer_old_state == PEER_INVALID) { | |
794b37d5 | 2506 | zlog_debug( |
2ba1fe69 | 2507 | "[BGP_GR] peer_old_state == Invalid state !"); |
794b37d5 | 2508 | return BGP_ERR_GR_OPERATION_FAILED; |
2509 | } | |
2510 | ||
2ba1fe69 | 2511 | peer_state = peer->PEER_GR_FSM[peer_old_state][peer_gr_cmd]; |
794b37d5 | 2512 | peer_new_state = peer_state.next_state; |
2513 | ||
2514 | if (peer_new_state == PEER_INVALID) { | |
794b37d5 | 2515 | zlog_debug( |
2ba1fe69 | 2516 | "[BGP_GR] Invalid bgp graceful restart command used !"); |
794b37d5 | 2517 | return BGP_ERR_GR_INVALID_CMD; |
2518 | } | |
2519 | ||
2520 | if (peer_new_state != peer_old_state) { | |
2521 | result = peer_state.action_fun(peer, | |
2522 | peer_old_state, | |
2523 | peer_new_state); | |
2524 | } else { | |
2ba1fe69 | 2525 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
2526 | zlog_debug( | |
2527 | "[BGP_GR] peer_old_state == peer_new_state !"); | |
794b37d5 | 2528 | return BGP_GR_NO_OPERATION; |
2529 | } | |
2530 | ||
2531 | if (result == BGP_GR_SUCCESS) { | |
2532 | ||
2533 | /* Update the mode i.e peer_new_state into the peer structure */ | |
2534 | peer->peer_gr_present_state = peer_new_state; | |
794b37d5 | 2535 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) |
2ba1fe69 | 2536 | zlog_debug("[BGP_GR] Succesfully change the state of the peer to : %s : !", |
2537 | print_peer_gr_mode(peer_new_state)); | |
794b37d5 | 2538 | |
2539 | return BGP_GR_SUCCESS; | |
2540 | } | |
2541 | ||
2542 | return result; | |
2543 | } | |
2544 | ||
2545 | unsigned int bgp_peer_gr_action(struct peer *peer, | |
2546 | int old_peer_state, int new_peer_state) | |
2547 | { | |
2548 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2549 | zlog_debug( | |
2ba1fe69 | 2550 | "%s [BGP_GR] Move peer from old_peer_state :%s: to new_peer_state :%s: !!!!", |
2551 | __func__, print_peer_gr_mode(old_peer_state), | |
2552 | print_peer_gr_mode(new_peer_state)); | |
794b37d5 | 2553 | |
2554 | int bgp_gr_global_mode = GLOBAL_INVALID; | |
2555 | unsigned int ret = BGP_GR_FAILURE; | |
2556 | ||
2557 | if (old_peer_state == new_peer_state) { | |
2558 | /* Nothing to do over here as the present and old state is the same */ | |
794b37d5 | 2559 | return BGP_GR_NO_OPERATION; |
2560 | } | |
2561 | if ((old_peer_state == PEER_INVALID) || | |
2562 | (new_peer_state == PEER_INVALID)) { | |
2563 | /* something bad happend , print error message */ | |
2564 | return BGP_ERR_GR_INVALID_CMD; | |
2565 | } | |
2566 | ||
2567 | bgp_gr_global_mode = bgp_global_gr_mode_get(peer->bgp); | |
2568 | ||
2569 | if ((old_peer_state == PEER_GLOBAL_INHERIT) && | |
2570 | (new_peer_state != PEER_GLOBAL_INHERIT)) { | |
2571 | ||
2572 | /* fetch the Mode running in the Global state machine | |
2573 | *from the bgp structure into a variable called | |
2574 | *bgp_gr_global_mode | |
2575 | */ | |
2576 | ||
2577 | /* Here we are checking if the | |
2578 | *1. peer_new_state == global_mode == helper_mode | |
2579 | *2. peer_new_state == global_mode == GR_mode | |
2580 | *3. peer_new_state == global_mode == disabled_mode | |
2581 | */ | |
2582 | ||
2583 | BGP_PEER_GR_GLOBAL_INHERIT_UNSET(peer); | |
2584 | ||
2585 | if (new_peer_state == bgp_gr_global_mode) { | |
2586 | /*This is incremental updates i.e no tear down | |
2587 | *of the existing session | |
2588 | *as the peer is already working in the same mode. | |
2589 | */ | |
794b37d5 | 2590 | ret = BGP_GR_SUCCESS; |
2591 | } else { | |
2592 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2593 | zlog_debug( | |
2ba1fe69 | 2594 | "[BGP_GR] Peer state changed from :%s ", |
2595 | print_peer_gr_mode(old_peer_state)); | |
794b37d5 | 2596 | |
2597 | bgp_peer_move_to_gr_mode(peer, new_peer_state); | |
2598 | ||
2599 | ret = BGP_GR_SUCCESS; | |
2600 | } | |
2601 | } | |
2602 | /* In the case below peer is going into Global inherit mode i.e. | |
2603 | * the peer would work as the mode configured at the global level | |
2604 | */ | |
2605 | else if ((new_peer_state == PEER_GLOBAL_INHERIT) && | |
2606 | (old_peer_state != PEER_GLOBAL_INHERIT)) { | |
2607 | /* Here in this case it would be destructive | |
2608 | * in all the cases except one case when, | |
2609 | * Global GR is configured Disabled | |
2610 | * and present_peer_state is not disable | |
2611 | */ | |
2612 | ||
2613 | BGP_PEER_GR_GLOBAL_INHERIT_SET(peer); | |
2614 | ||
2615 | if (old_peer_state == bgp_gr_global_mode) { | |
2616 | ||
2617 | /* This is incremental updates | |
2618 | *i.e no tear down of the existing session | |
2619 | *as the peer is already working in the same mode. | |
2620 | */ | |
2621 | ret = BGP_GR_SUCCESS; | |
2622 | } else { | |
2623 | /* Destructive always */ | |
2624 | /* Tear down the old session | |
2625 | * and send the new capability | |
2626 | * as per the bgp_gr_global_mode | |
2627 | */ | |
2628 | ||
2629 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2ba1fe69 | 2630 | zlog_debug("[BGP_GR] Peer state changed from :%s", |
2631 | print_peer_gr_mode(old_peer_state)); | |
794b37d5 | 2632 | |
2633 | bgp_peer_move_to_gr_mode(peer, bgp_gr_global_mode); | |
2634 | ||
2635 | ret = BGP_GR_SUCCESS; | |
2636 | } | |
2637 | } else { | |
2638 | /* | |
2639 | *This else case, it include all the cases except --> | |
2640 | *(new_peer_state != Peer_Global) && | |
2641 | *( old_peer_state != Peer_Global ) | |
2642 | */ | |
2643 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2ba1fe69 | 2644 | zlog_debug("[BGP_GR] Peer state changed from :%s", |
2645 | print_peer_gr_mode(old_peer_state)); | |
794b37d5 | 2646 | |
2647 | bgp_peer_move_to_gr_mode(peer, new_peer_state); | |
2648 | ||
2649 | ret = BGP_GR_SUCCESS; | |
2650 | } | |
2651 | ||
2652 | return ret; | |
2653 | } | |
2654 | ||
2655 | inline void bgp_peer_move_to_gr_mode(struct peer *peer, int new_state) | |
2656 | ||
2657 | { | |
2658 | int bgp_global_gr_mode = bgp_global_gr_mode_get(peer->bgp); | |
2659 | ||
2660 | switch (new_state) { | |
794b37d5 | 2661 | case PEER_HELPER: |
2662 | BGP_PEER_GR_HELPER_ENABLE(peer); | |
2663 | break; | |
794b37d5 | 2664 | case PEER_GR: |
2665 | BGP_PEER_GR_ENABLE(peer); | |
2666 | break; | |
794b37d5 | 2667 | case PEER_DISABLE: |
2668 | BGP_PEER_GR_DISABLE(peer); | |
2669 | break; | |
794b37d5 | 2670 | case PEER_GLOBAL_INHERIT: |
2671 | BGP_PEER_GR_GLOBAL_INHERIT_SET(peer); | |
2672 | ||
2673 | if (bgp_global_gr_mode == GLOBAL_HELPER) { | |
2674 | BGP_PEER_GR_HELPER_ENABLE(peer); | |
2675 | } else if (bgp_global_gr_mode == GLOBAL_GR) { | |
2676 | BGP_PEER_GR_ENABLE(peer); | |
2677 | } else if (bgp_global_gr_mode == GLOBAL_DISABLE) { | |
2678 | BGP_PEER_GR_DISABLE(peer); | |
2679 | } else { | |
2ba1fe69 | 2680 | zlog_err( |
2681 | "[BGP_GR] Default switch inherit mode ::: SOMETHING IS WRONG !!!"); | |
794b37d5 | 2682 | } |
2683 | break; | |
2684 | default: | |
2ba1fe69 | 2685 | zlog_err("[BGP_GR] Default switch mode ::: SOMETHING IS WRONG !!!"); |
794b37d5 | 2686 | break; |
2687 | } | |
2688 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2ba1fe69 | 2689 | zlog_debug("[BGP_GR] Peer state changed --to--> : %d : !", |
794b37d5 | 2690 | new_state); |
2691 | } | |
2692 | ||
2693 | void bgp_peer_gr_flags_update(struct peer *peer) | |
2694 | { | |
2695 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2696 | zlog_debug( | |
2ba1fe69 | 2697 | "%s [BGP_GR] called !", |
794b37d5 | 2698 | __func__); |
2699 | if (CHECK_FLAG(peer->peer_gr_new_status_flag, | |
2700 | PEER_GRACEFUL_RESTART_NEW_STATE_HELPER)) | |
2986cac2 | 2701 | SET_FLAG(peer->flags, |
794b37d5 | 2702 | PEER_FLAG_GRACEFUL_RESTART_HELPER); |
2703 | else | |
2986cac2 | 2704 | UNSET_FLAG(peer->flags, |
794b37d5 | 2705 | PEER_FLAG_GRACEFUL_RESTART_HELPER); |
2706 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2707 | zlog_debug( | |
2ba1fe69 | 2708 | "[BGP_GR] Peer %s Flag PEER_FLAG_GRACEFUL_RESTART_HELPER : %s : !", |
794b37d5 | 2709 | peer->host, |
2986cac2 | 2710 | (CHECK_FLAG(peer->flags, |
794b37d5 | 2711 | PEER_FLAG_GRACEFUL_RESTART_HELPER) ? |
2712 | "Set" : "UnSet")); | |
2713 | if (CHECK_FLAG(peer->peer_gr_new_status_flag, | |
2714 | PEER_GRACEFUL_RESTART_NEW_STATE_RESTART)) | |
2986cac2 | 2715 | SET_FLAG(peer->flags, |
794b37d5 | 2716 | PEER_FLAG_GRACEFUL_RESTART); |
2717 | else | |
2986cac2 | 2718 | UNSET_FLAG(peer->flags, |
794b37d5 | 2719 | PEER_FLAG_GRACEFUL_RESTART); |
2720 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2721 | zlog_debug( | |
2ba1fe69 | 2722 | "[BGP_GR] Peer %s Flag PEER_FLAG_GRACEFUL_RESTART : %s : !", |
794b37d5 | 2723 | peer->host, |
2986cac2 | 2724 | (CHECK_FLAG(peer->flags, |
794b37d5 | 2725 | PEER_FLAG_GRACEFUL_RESTART) ? |
2726 | "Set" : "UnSet")); | |
2727 | if (CHECK_FLAG(peer->peer_gr_new_status_flag, | |
2728 | PEER_GRACEFUL_RESTART_NEW_STATE_INHERIT)) | |
2986cac2 | 2729 | SET_FLAG(peer->flags, |
794b37d5 | 2730 | PEER_FLAG_GRACEFUL_RESTART_GLOBAL_INHERIT); |
2731 | else | |
2986cac2 | 2732 | UNSET_FLAG(peer->flags, |
794b37d5 | 2733 | PEER_FLAG_GRACEFUL_RESTART_GLOBAL_INHERIT); |
2734 | if (BGP_DEBUG(graceful_restart, GRACEFUL_RESTART)) | |
2735 | zlog_debug( | |
2ba1fe69 | 2736 | "[BGP_GR] Peer %s Flag PEER_FLAG_GRACEFUL_RESTART_GLOBAL_INHERIT : %s : !", |
794b37d5 | 2737 | peer->host, |
2986cac2 | 2738 | (CHECK_FLAG(peer->flags, |
794b37d5 | 2739 | PEER_FLAG_GRACEFUL_RESTART_GLOBAL_INHERIT) ? |
d7b3cda6 | 2740 | "Set" : "UnSet")); |
2741 | ||
2742 | if (!CHECK_FLAG(peer->flags, | |
2743 | PEER_FLAG_GRACEFUL_RESTART) && | |
2744 | !CHECK_FLAG(peer->flags, | |
2745 | PEER_FLAG_GRACEFUL_RESTART_HELPER)){ | |
2746 | zlog_debug( | |
2ba1fe69 | 2747 | "[BGP_GR] Peer %s UNSET PEER_STATUS_NSF_MODE!", |
d7b3cda6 | 2748 | peer->host); |
2749 | ||
2750 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
2751 | ||
2752 | if (CHECK_FLAG(peer->sflags, | |
2753 | PEER_STATUS_NSF_WAIT)) { | |
2754 | ||
2755 | peer_nsf_stop(peer); | |
2756 | zlog_debug( | |
2ba1fe69 | 2757 | "[BGP_GR] Peer %s UNSET PEER_STATUS_NSF_WAIT!", |
d7b3cda6 | 2758 | peer->host); |
2759 | } | |
2760 | } | |
794b37d5 | 2761 | } |