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Commit | Line | Data |
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718e3744 | 1 | /* BGP network related fucntions |
896014f4 DL |
2 | * Copyright (C) 1999 Kunihiro Ishiguro |
3 | * | |
4 | * This file is part of GNU Zebra. | |
5 | * | |
6 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
11 | * GNU Zebra is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
718e3744 | 20 | |
21 | #include <zebra.h> | |
22 | ||
23 | #include "thread.h" | |
24 | #include "sockunion.h" | |
0df7c91f | 25 | #include "sockopt.h" |
718e3744 | 26 | #include "memory.h" |
27 | #include "log.h" | |
28 | #include "if.h" | |
29 | #include "prefix.h" | |
30 | #include "command.h" | |
edd7c245 | 31 | #include "privs.h" |
0df7c91f | 32 | #include "linklist.h" |
fdbc8e77 | 33 | #include "network.h" |
3f9c7369 | 34 | #include "queue.h" |
66e373ae | 35 | #include "hash.h" |
039f3a34 | 36 | #include "filter.h" |
61cf4b37 | 37 | #include "ns.h" |
174482ef | 38 | #include "lib_errors.h" |
17cdd31e | 39 | #include "nexthop.h" |
718e3744 | 40 | |
41 | #include "bgpd/bgpd.h" | |
1ff9a340 | 42 | #include "bgpd/bgp_open.h" |
718e3744 | 43 | #include "bgpd/bgp_fsm.h" |
44 | #include "bgpd/bgp_attr.h" | |
45 | #include "bgpd/bgp_debug.h" | |
14454c9f | 46 | #include "bgpd/bgp_errors.h" |
718e3744 | 47 | #include "bgpd/bgp_network.h" |
17cdd31e | 48 | #include "bgpd/bgp_zebra.h" |
edd7c245 | 49 | |
50 | extern struct zebra_privs_t bgpd_privs; | |
51 | ||
97896a91 | 52 | static char *bgp_get_bound_name(struct peer *peer); |
f2345335 | 53 | |
d023aec4 | 54 | /* BGP listening socket. */ |
d62a17ae | 55 | struct bgp_listener { |
56 | int fd; | |
57 | union sockunion su; | |
58 | struct thread *thread; | |
61cf4b37 | 59 | struct bgp *bgp; |
2a0e69ae | 60 | char *name; |
d023aec4 | 61 | }; |
6b0655a2 | 62 | |
2a0e69ae DS |
63 | void bgp_dump_listener_info(struct vty *vty) |
64 | { | |
65 | struct listnode *node; | |
66 | struct bgp_listener *listener; | |
67 | ||
68 | vty_out(vty, "Name fd Address\n"); | |
69 | vty_out(vty, "---------------------------\n"); | |
70 | for (ALL_LIST_ELEMENTS_RO(bm->listen_sockets, node, listener)) { | |
71 | char buf[SU_ADDRSTRLEN]; | |
72 | ||
73 | vty_out(vty, "%-16s %d %s\n", | |
74 | listener->name ? listener->name : VRF_DEFAULT_NAME, | |
75 | listener->fd, | |
76 | sockunion2str(&listener->su, buf, sizeof(buf))); | |
77 | } | |
78 | } | |
79 | ||
0df7c91f PJ |
80 | /* |
81 | * Set MD5 key for the socket, for the given IPv4 peer address. | |
82 | * If the password is NULL or zero-length, the option will be disabled. | |
83 | */ | |
d62a17ae | 84 | static int bgp_md5_set_socket(int socket, union sockunion *su, |
9e7d9a61 | 85 | uint16_t prefixlen, const char *password) |
0df7c91f | 86 | { |
d62a17ae | 87 | int ret = -1; |
88 | int en = ENOSYS; | |
ea8b7c71 | 89 | #if HAVE_DECL_TCP_MD5SIG |
d62a17ae | 90 | union sockunion su2; |
ea8b7c71 | 91 | #endif /* HAVE_TCP_MD5SIG */ |
d62a17ae | 92 | |
93 | assert(socket >= 0); | |
94 | ||
95 | #if HAVE_DECL_TCP_MD5SIG | |
96 | /* Ensure there is no extraneous port information. */ | |
97 | memcpy(&su2, su, sizeof(union sockunion)); | |
98 | if (su2.sa.sa_family == AF_INET) | |
99 | su2.sin.sin_port = 0; | |
100 | else | |
101 | su2.sin6.sin6_port = 0; | |
9e7d9a61 QY |
102 | |
103 | /* For addresses, use the non-extended signature functionality */ | |
104 | if ((su2.sa.sa_family == AF_INET && prefixlen == IPV4_MAX_PREFIXLEN) | |
105 | || (su2.sa.sa_family == AF_INET6 | |
106 | && prefixlen == IPV6_MAX_PREFIXLEN)) | |
107 | ret = sockopt_tcp_signature(socket, &su2, password); | |
108 | else | |
109 | ret = sockopt_tcp_signature_ext(socket, &su2, prefixlen, | |
110 | password); | |
d62a17ae | 111 | en = errno; |
0df7c91f | 112 | #endif /* HAVE_TCP_MD5SIG */ |
0df7c91f | 113 | |
9e7d9a61 QY |
114 | if (ret < 0) { |
115 | char sabuf[SU_ADDRSTRLEN]; | |
116 | sockunion2str(su, sabuf, sizeof(sabuf)); | |
117 | ||
118 | switch (ret) { | |
119 | case -2: | |
120 | flog_warn( | |
121 | EC_BGP_NO_TCP_MD5, | |
122 | "Unable to set TCP MD5 option on socket for peer %s (sock=%d): This platform does not support MD5 auth for prefixes", | |
123 | sabuf, socket); | |
124 | break; | |
125 | default: | |
126 | flog_warn( | |
127 | EC_BGP_NO_TCP_MD5, | |
128 | "Unable to set TCP MD5 option on socket for peer %s (sock=%d): %s", | |
129 | sabuf, socket, safe_strerror(en)); | |
130 | } | |
131 | } | |
d62a17ae | 132 | |
133 | return ret; | |
0df7c91f PJ |
134 | } |
135 | ||
136 | /* Helper for bgp_connect */ | |
d62a17ae | 137 | static int bgp_md5_set_connect(int socket, union sockunion *su, |
9e7d9a61 | 138 | uint16_t prefixlen, const char *password) |
0df7c91f | 139 | { |
d62a17ae | 140 | int ret = -1; |
141 | ||
142 | #if HAVE_DECL_TCP_MD5SIG | |
0cf6db21 | 143 | frr_with_privs(&bgpd_privs) { |
9e7d9a61 | 144 | ret = bgp_md5_set_socket(socket, su, prefixlen, password); |
d62a17ae | 145 | } |
0df7c91f | 146 | #endif /* HAVE_TCP_MD5SIG */ |
d62a17ae | 147 | |
148 | return ret; | |
0df7c91f PJ |
149 | } |
150 | ||
d62a17ae | 151 | static int bgp_md5_set_password(struct peer *peer, const char *password) |
0df7c91f | 152 | { |
d62a17ae | 153 | struct listnode *node; |
154 | int ret = 0; | |
155 | struct bgp_listener *listener; | |
156 | ||
9e7d9a61 QY |
157 | /* |
158 | * Set or unset the password on the listen socket(s). Outbound | |
6bb30c2c | 159 | * connections are taken care of in bgp_connect() below. |
d62a17ae | 160 | */ |
0cf6db21 | 161 | frr_with_privs(&bgpd_privs) { |
6bb30c2c | 162 | for (ALL_LIST_ELEMENTS_RO(bm->listen_sockets, node, listener)) |
a4faae3a PR |
163 | if (listener->su.sa.sa_family == |
164 | peer->su.sa.sa_family) { | |
9e7d9a61 QY |
165 | uint16_t prefixlen = |
166 | peer->su.sa.sa_family == AF_INET | |
a4faae3a PR |
167 | ? IPV4_MAX_PREFIXLEN |
168 | : IPV6_MAX_PREFIXLEN; | |
169 | ||
170 | /* | |
171 | * if we have stored a BGP vrf instance in the | |
172 | * listener it must match the bgp instance in | |
173 | * the peer otherwise the peer bgp instance | |
174 | * must be the default vrf or a view instance | |
175 | */ | |
176 | if (!listener->bgp) { | |
177 | if (peer->bgp->vrf_id != VRF_DEFAULT | |
178 | && peer->bgp->inst_type | |
179 | != BGP_INSTANCE_TYPE_VIEW) | |
180 | continue; | |
181 | } else if (listener->bgp != peer->bgp) | |
182 | continue; | |
9e7d9a61 | 183 | |
6bb30c2c | 184 | ret = bgp_md5_set_socket(listener->fd, |
9e7d9a61 QY |
185 | &peer->su, prefixlen, |
186 | password); | |
187 | break; | |
188 | } | |
189 | } | |
190 | return ret; | |
191 | } | |
192 | ||
a4faae3a | 193 | int bgp_md5_set_prefix(struct bgp *bgp, struct prefix *p, const char *password) |
9e7d9a61 QY |
194 | { |
195 | int ret = 0; | |
196 | union sockunion su; | |
197 | struct listnode *node; | |
198 | struct bgp_listener *listener; | |
199 | ||
200 | /* Set or unset the password on the listen socket(s). */ | |
0cf6db21 | 201 | frr_with_privs(&bgpd_privs) { |
9e7d9a61 | 202 | for (ALL_LIST_ELEMENTS_RO(bm->listen_sockets, node, listener)) |
a4faae3a PR |
203 | if (listener->su.sa.sa_family == p->family |
204 | && ((bgp->vrf_id == VRF_DEFAULT) | |
205 | || (listener->bgp == bgp))) { | |
9e7d9a61 QY |
206 | prefix2sockunion(p, &su); |
207 | ret = bgp_md5_set_socket(listener->fd, &su, | |
208 | p->prefixlen, | |
209 | password); | |
6bb30c2c DL |
210 | break; |
211 | } | |
212 | } | |
9e7d9a61 | 213 | |
d62a17ae | 214 | return ret; |
0df7c91f | 215 | } |
3374bef0 | 216 | |
a4faae3a | 217 | int bgp_md5_unset_prefix(struct bgp *bgp, struct prefix *p) |
9e7d9a61 | 218 | { |
a4faae3a | 219 | return bgp_md5_set_prefix(bgp, p, NULL); |
9e7d9a61 QY |
220 | } |
221 | ||
d62a17ae | 222 | int bgp_md5_set(struct peer *peer) |
89ca90fa | 223 | { |
d62a17ae | 224 | /* Set the password from listen socket. */ |
225 | return bgp_md5_set_password(peer, peer->password); | |
89ca90fa | 226 | } |
227 | ||
d62a17ae | 228 | int bgp_md5_unset(struct peer *peer) |
89ca90fa | 229 | { |
d62a17ae | 230 | /* Unset the password from listen socket. */ |
231 | return bgp_md5_set_password(peer, NULL); | |
89ca90fa | 232 | } |
233 | ||
d62a17ae | 234 | int bgp_set_socket_ttl(struct peer *peer, int bgp_sock) |
ef0b0c3e | 235 | { |
d62a17ae | 236 | char buf[INET_ADDRSTRLEN]; |
237 | int ret = 0; | |
238 | ||
239 | /* In case of peer is EBGP, we should set TTL for this connection. */ | |
bf0d28dc | 240 | if (!peer->gtsm_hops && (peer_sort_lookup(peer) == BGP_PEER_EBGP)) { |
d62a17ae | 241 | ret = sockopt_ttl(peer->su.sa.sa_family, bgp_sock, peer->ttl); |
242 | if (ret) { | |
af4c2728 | 243 | flog_err( |
450971aa | 244 | EC_LIB_SOCKET, |
d62a17ae | 245 | "%s: Can't set TxTTL on peer (rtrid %s) socket, err = %d", |
14454c9f DS |
246 | __func__, |
247 | inet_ntop(AF_INET, &peer->remote_id, buf, | |
248 | sizeof(buf)), | |
d62a17ae | 249 | errno); |
250 | return ret; | |
251 | } | |
252 | } else if (peer->gtsm_hops) { | |
253 | /* On Linux, setting minttl without setting ttl seems to mess | |
254 | with the | |
255 | outgoing ttl. Therefore setting both. | |
256 | */ | |
257 | ret = sockopt_ttl(peer->su.sa.sa_family, bgp_sock, MAXTTL); | |
258 | if (ret) { | |
af4c2728 | 259 | flog_err( |
450971aa | 260 | EC_LIB_SOCKET, |
d62a17ae | 261 | "%s: Can't set TxTTL on peer (rtrid %s) socket, err = %d", |
14454c9f DS |
262 | __func__, |
263 | inet_ntop(AF_INET, &peer->remote_id, buf, | |
264 | sizeof(buf)), | |
d62a17ae | 265 | errno); |
266 | return ret; | |
267 | } | |
268 | ret = sockopt_minttl(peer->su.sa.sa_family, bgp_sock, | |
269 | MAXTTL + 1 - peer->gtsm_hops); | |
270 | if (ret) { | |
af4c2728 | 271 | flog_err( |
450971aa | 272 | EC_LIB_SOCKET, |
d62a17ae | 273 | "%s: Can't set MinTTL on peer (rtrid %s) socket, err = %d", |
14454c9f DS |
274 | __func__, |
275 | inet_ntop(AF_INET, &peer->remote_id, buf, | |
276 | sizeof(buf)), | |
d62a17ae | 277 | errno); |
278 | return ret; | |
279 | } | |
280 | } | |
281 | ||
282 | return ret; | |
ef0b0c3e DL |
283 | } |
284 | ||
8dee0396 | 285 | /* |
286 | * Obtain the BGP instance that the incoming connection should be processed | |
287 | * against. This is important because more than one VRF could be using the | |
288 | * same IP address space. The instance is got by obtaining the device to | |
289 | * which the incoming connection is bound to. This could either be a VRF | |
290 | * or it could be an interface, which in turn determines the VRF. | |
291 | */ | |
d62a17ae | 292 | static int bgp_get_instance_for_inc_conn(int sock, struct bgp **bgp_inst) |
8dee0396 | 293 | { |
120c6587 | 294 | #ifndef SO_BINDTODEVICE |
d62a17ae | 295 | /* only Linux has SO_BINDTODEVICE, but we're in Linux-specific code here |
296 | * anyway since the assumption is that the interface name returned by | |
297 | * getsockopt() is useful in identifying the VRF, particularly with | |
298 | * Linux's | |
299 | * VRF l3master device. The whole mechanism is specific to Linux, so... | |
300 | * when other platforms add VRF support, this will need handling here as | |
301 | * well. (or, some restructuring) */ | |
302 | *bgp_inst = bgp_get_default(); | |
303 | return !*bgp_inst; | |
120c6587 DL |
304 | |
305 | #else | |
d62a17ae | 306 | char name[VRF_NAMSIZ + 1]; |
307 | socklen_t name_len = VRF_NAMSIZ; | |
308 | struct bgp *bgp; | |
309 | int rc; | |
310 | struct listnode *node, *nnode; | |
311 | ||
312 | *bgp_inst = NULL; | |
313 | name[0] = '\0'; | |
314 | rc = getsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, name, &name_len); | |
315 | if (rc != 0) { | |
316 | #if defined(HAVE_CUMULUS) | |
1c50c1c0 QY |
317 | flog_err(EC_LIB_SOCKET, |
318 | "[Error] BGP SO_BINDTODEVICE get failed (%s), sock %d", | |
319 | safe_strerror(errno), sock); | |
d62a17ae | 320 | return -1; |
b5826a12 | 321 | #endif |
d62a17ae | 322 | } |
323 | ||
324 | if (!strlen(name)) { | |
325 | *bgp_inst = bgp_get_default(); | |
326 | return 0; /* default instance. */ | |
327 | } | |
328 | ||
329 | /* First try match to instance; if that fails, check for interfaces. */ | |
330 | bgp = bgp_lookup_by_name(name); | |
331 | if (bgp) { | |
332 | if (!bgp->vrf_id) // unexpected | |
333 | return -1; | |
334 | *bgp_inst = bgp; | |
335 | return 0; | |
336 | } | |
337 | ||
338 | /* TODO - This will be optimized once interfaces move into the NS */ | |
339 | for (ALL_LIST_ELEMENTS(bm->bgp, node, nnode, bgp)) { | |
340 | struct interface *ifp; | |
341 | ||
342 | if (bgp->inst_type == BGP_INSTANCE_TYPE_VIEW) | |
343 | continue; | |
344 | ||
a36898e7 | 345 | ifp = if_lookup_by_name(name, bgp->vrf_id); |
d62a17ae | 346 | if (ifp) { |
347 | *bgp_inst = bgp; | |
348 | return 0; | |
349 | } | |
350 | } | |
351 | ||
352 | /* We didn't match to either an instance or an interface. */ | |
353 | return -1; | |
120c6587 | 354 | #endif |
8dee0396 | 355 | } |
356 | ||
c2d020ad DS |
357 | static void bgp_socket_set_buffer_size(const int fd) |
358 | { | |
359 | if (getsockopt_so_sendbuf(fd) < (int)bm->socket_buffer) | |
360 | setsockopt_so_sendbuf(fd, bm->socket_buffer); | |
361 | if (getsockopt_so_recvbuf(fd) < (int)bm->socket_buffer) | |
362 | setsockopt_so_recvbuf(fd, bm->socket_buffer); | |
363 | } | |
364 | ||
718e3744 | 365 | /* Accept bgp connection. */ |
d62a17ae | 366 | static int bgp_accept(struct thread *thread) |
718e3744 | 367 | { |
d62a17ae | 368 | int bgp_sock; |
369 | int accept_sock; | |
370 | union sockunion su; | |
371 | struct bgp_listener *listener = THREAD_ARG(thread); | |
372 | struct peer *peer; | |
373 | struct peer *peer1; | |
374 | char buf[SU_ADDRSTRLEN]; | |
375 | struct bgp *bgp = NULL; | |
376 | ||
377 | sockunion_init(&su); | |
378 | ||
2f9db11b QY |
379 | bgp = bgp_lookup_by_name(listener->name); |
380 | ||
d62a17ae | 381 | /* Register accept thread. */ |
382 | accept_sock = THREAD_FD(thread); | |
383 | if (accept_sock < 0) { | |
2f9db11b QY |
384 | flog_err_sys(EC_LIB_SOCKET, |
385 | "[Error] BGP accept socket fd is negative: %d", | |
09c866e3 | 386 | accept_sock); |
d62a17ae | 387 | return -1; |
388 | } | |
389 | listener->thread = NULL; | |
61cf4b37 | 390 | |
d62a17ae | 391 | thread_add_read(bm->master, bgp_accept, listener, accept_sock, |
392 | &listener->thread); | |
393 | ||
394 | /* Accept client connection. */ | |
395 | bgp_sock = sockunion_accept(accept_sock, &su); | |
2f9db11b | 396 | int save_errno = errno; |
d62a17ae | 397 | if (bgp_sock < 0) { |
2f9db11b QY |
398 | if (save_errno == EINVAL) { |
399 | struct vrf *vrf = | |
400 | bgp ? vrf_lookup_by_id(bgp->vrf_id) : NULL; | |
401 | ||
402 | /* | |
403 | * It appears that sometimes, when VRFs are deleted on | |
404 | * the system, it takes a little while for us to get | |
405 | * notified about that. In the meantime we endlessly | |
406 | * loop on accept(), because the socket, having been | |
407 | * bound to a now-deleted VRF device, is in some weird | |
408 | * state which causes accept() to fail. | |
409 | * | |
410 | * To avoid this, if we see accept() fail with EINVAL, | |
411 | * we cancel ourselves and trust that when the VRF | |
412 | * deletion notification comes in the event handler for | |
413 | * that will take care of cleaning us up. | |
414 | */ | |
415 | flog_err_sys( | |
416 | EC_LIB_SOCKET, | |
417 | "[Error] accept() failed with error \"%s\" on BGP listener socket %d for BGP instance in VRF \"%s\"; refreshing socket", | |
418 | safe_strerror(save_errno), accept_sock, | |
419 | VRF_LOGNAME(vrf)); | |
420 | THREAD_OFF(listener->thread); | |
421 | } else { | |
422 | flog_err_sys( | |
423 | EC_LIB_SOCKET, | |
424 | "[Error] BGP socket accept failed (%s); retrying", | |
425 | safe_strerror(save_errno)); | |
426 | } | |
d62a17ae | 427 | return -1; |
428 | } | |
429 | set_nonblocking(bgp_sock); | |
430 | ||
61cf4b37 PG |
431 | /* Obtain BGP instance this connection is meant for. |
432 | * - if it is a VRF netns sock, then BGP is in listener structure | |
433 | * - otherwise, the bgp instance need to be demultiplexed | |
434 | */ | |
435 | if (listener->bgp) | |
436 | bgp = listener->bgp; | |
437 | else if (bgp_get_instance_for_inc_conn(bgp_sock, &bgp)) { | |
d62a17ae | 438 | if (bgp_debug_neighbor_events(NULL)) |
439 | zlog_debug( | |
440 | "[Event] Could not get instance for incoming conn from %s", | |
441 | inet_sutop(&su, buf)); | |
442 | close(bgp_sock); | |
443 | return -1; | |
444 | } | |
445 | ||
c2d020ad | 446 | bgp_socket_set_buffer_size(bgp_sock); |
d62a17ae | 447 | |
448 | /* Check remote IP address */ | |
449 | peer1 = peer_lookup(bgp, &su); | |
450 | ||
451 | if (!peer1) { | |
452 | peer1 = peer_lookup_dynamic_neighbor(bgp, &su); | |
453 | if (peer1) { | |
454 | /* Dynamic neighbor has been created, let it proceed */ | |
455 | peer1->fd = bgp_sock; | |
456 | bgp_fsm_change_status(peer1, Active); | |
457 | BGP_TIMER_OFF( | |
458 | peer1->t_start); /* created in peer_create() */ | |
459 | ||
6c537a18 DS |
460 | if (peer_active(peer1)) { |
461 | if (CHECK_FLAG(peer1->flags, | |
462 | PEER_FLAG_TIMER_DELAYOPEN)) | |
463 | BGP_EVENT_ADD( | |
464 | peer1, | |
465 | TCP_connection_open_w_delay); | |
466 | else | |
467 | BGP_EVENT_ADD(peer1, | |
468 | TCP_connection_open); | |
469 | } | |
d62a17ae | 470 | |
471 | return 0; | |
472 | } | |
473 | } | |
474 | ||
475 | if (!peer1) { | |
476 | if (bgp_debug_neighbor_events(NULL)) { | |
477 | zlog_debug( | |
45069622 DS |
478 | "[Event] %s connection rejected(%s:%u:%s) - not configured and not valid for dynamic", |
479 | inet_sutop(&su, buf), bgp->name_pretty, bgp->as, | |
480 | VRF_LOGNAME(vrf_lookup_by_id(bgp->vrf_id))); | |
d62a17ae | 481 | } |
482 | close(bgp_sock); | |
483 | return -1; | |
484 | } | |
485 | ||
cb9196e7 DS |
486 | if (CHECK_FLAG(peer1->flags, PEER_FLAG_SHUTDOWN) |
487 | || CHECK_FLAG(peer1->bgp->flags, BGP_FLAG_SHUTDOWN)) { | |
d62a17ae | 488 | if (bgp_debug_neighbor_events(peer1)) |
489 | zlog_debug( | |
45069622 DS |
490 | "[Event] connection from %s rejected(%s:%u:%s) due to admin shutdown", |
491 | inet_sutop(&su, buf), bgp->name_pretty, bgp->as, | |
492 | VRF_LOGNAME(vrf_lookup_by_id(bgp->vrf_id))); | |
d62a17ae | 493 | close(bgp_sock); |
494 | return -1; | |
495 | } | |
496 | ||
497 | /* | |
498 | * Do not accept incoming connections in Clearing state. This can result | |
499 | * in incorect state transitions - e.g., the connection goes back to | |
500 | * Established and then the Clearing_Completed event is generated. Also, | |
501 | * block incoming connection in Deleted state. | |
502 | */ | |
503 | if (peer1->status == Clearing || peer1->status == Deleted) { | |
504 | if (bgp_debug_neighbor_events(peer1)) | |
505 | zlog_debug( | |
506 | "[Event] Closing incoming conn for %s (%p) state %d", | |
507 | peer1->host, peer1, peer1->status); | |
508 | close(bgp_sock); | |
509 | return -1; | |
510 | } | |
511 | ||
512 | /* Check that at least one AF is activated for the peer. */ | |
513 | if (!peer_active(peer1)) { | |
514 | if (bgp_debug_neighbor_events(peer1)) | |
515 | zlog_debug( | |
516 | "%s - incoming conn rejected - no AF activated for peer", | |
517 | peer1->host); | |
518 | close(bgp_sock); | |
519 | return -1; | |
520 | } | |
521 | ||
d091d9ad DA |
522 | /* Do not try to reconnect if the peer reached maximum |
523 | * prefixes, restart timer is still running or the peer | |
524 | * is shutdown. | |
525 | */ | |
526 | if (BGP_PEER_START_SUPPRESSED(peer1)) { | |
497b686a MS |
527 | if (bgp_debug_neighbor_events(peer1)) |
528 | zlog_debug( | |
3efd0893 | 529 | "[Event] Incoming BGP connection rejected from %s due to maximum-prefix or shutdown", |
497b686a MS |
530 | peer1->host); |
531 | close(bgp_sock); | |
532 | return -1; | |
533 | } | |
534 | ||
d62a17ae | 535 | if (bgp_debug_neighbor_events(peer1)) |
536 | zlog_debug("[Event] BGP connection from host %s fd %d", | |
537 | inet_sutop(&su, buf), bgp_sock); | |
538 | ||
539 | if (peer1->doppelganger) { | |
540 | /* We have an existing connection. Kill the existing one and run | |
541 | with this one. | |
542 | */ | |
543 | if (bgp_debug_neighbor_events(peer1)) | |
544 | zlog_debug( | |
3efd0893 | 545 | "[Event] New active connection from peer %s, Killing previous active connection", |
d62a17ae | 546 | peer1->host); |
547 | peer_delete(peer1->doppelganger); | |
548 | } | |
549 | ||
550 | if (bgp_set_socket_ttl(peer1, bgp_sock) < 0) | |
551 | if (bgp_debug_neighbor_events(peer1)) | |
552 | zlog_debug( | |
553 | "[Event] Unable to set min/max TTL on peer %s, Continuing", | |
554 | peer1->host); | |
555 | ||
556 | peer = peer_create(&su, peer1->conf_if, peer1->bgp, peer1->local_as, | |
557 | peer1->as, peer1->as_type, 0, 0, NULL); | |
d62a17ae | 558 | hash_release(peer->bgp->peerhash, peer); |
559 | hash_get(peer->bgp->peerhash, peer, hash_alloc_intern); | |
560 | ||
561 | peer_xfer_config(peer, peer1); | |
d7b3cda6 | 562 | bgp_peer_gr_flags_update(peer); |
563 | ||
36235319 QY |
564 | BGP_GR_ROUTER_DETECT_AND_SEND_CAPABILITY_TO_ZEBRA(peer->bgp, |
565 | peer->bgp->peer); | |
0f0444fb | 566 | |
d7b3cda6 | 567 | if (bgp_peer_gr_mode_get(peer) == PEER_DISABLE) { |
568 | ||
569 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
570 | ||
36235319 | 571 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { |
d7b3cda6 | 572 | peer_nsf_stop(peer); |
573 | } | |
574 | } | |
575 | ||
d62a17ae | 576 | UNSET_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE); |
577 | ||
578 | peer->doppelganger = peer1; | |
579 | peer1->doppelganger = peer; | |
580 | peer->fd = bgp_sock; | |
97896a91 | 581 | vrf_bind(peer->bgp->vrf_id, bgp_sock, bgp_get_bound_name(peer)); |
d62a17ae | 582 | bgp_fsm_change_status(peer, Active); |
583 | BGP_TIMER_OFF(peer->t_start); /* created in peer_create() */ | |
584 | ||
585 | SET_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER); | |
d62a17ae | 586 | /* Make dummy peer until read Open packet. */ |
587 | if (peer1->status == Established | |
36235319 | 588 | && CHECK_FLAG(peer1->sflags, PEER_STATUS_NSF_MODE)) { |
d62a17ae | 589 | /* If we have an existing established connection with graceful |
590 | * restart | |
591 | * capability announced with one or more address families, then | |
592 | * drop | |
593 | * existing established connection and move state to connect. | |
594 | */ | |
595 | peer1->last_reset = PEER_DOWN_NSF_CLOSE_SESSION; | |
d7b3cda6 | 596 | |
36235319 QY |
597 | if (CHECK_FLAG(peer1->flags, PEER_FLAG_GRACEFUL_RESTART) |
598 | || CHECK_FLAG(peer1->flags, | |
599 | PEER_FLAG_GRACEFUL_RESTART_HELPER)) | |
600 | SET_FLAG(peer1->sflags, PEER_STATUS_NSF_WAIT); | |
d7b3cda6 | 601 | |
d62a17ae | 602 | bgp_event_update(peer1, TCP_connection_closed); |
603 | } | |
604 | ||
605 | if (peer_active(peer)) { | |
6c537a18 DS |
606 | if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER_DELAYOPEN)) |
607 | BGP_EVENT_ADD(peer, TCP_connection_open_w_delay); | |
608 | else | |
609 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
d62a17ae | 610 | } |
611 | ||
612 | return 0; | |
718e3744 | 613 | } |
614 | ||
615 | /* BGP socket bind. */ | |
97896a91 | 616 | static char *bgp_get_bound_name(struct peer *peer) |
718e3744 | 617 | { |
d62a17ae | 618 | char *name = NULL; |
619 | ||
a2bce1c8 DS |
620 | if (!peer) |
621 | return NULL; | |
622 | ||
996c9314 LB |
623 | if ((peer->bgp->vrf_id == VRF_DEFAULT) && !peer->ifname |
624 | && !peer->conf_if) | |
97896a91 PG |
625 | return NULL; |
626 | ||
d62a17ae | 627 | if (peer->su.sa.sa_family != AF_INET |
628 | && peer->su.sa.sa_family != AF_INET6) | |
97896a91 | 629 | return NULL; // unexpected |
d62a17ae | 630 | |
631 | /* For IPv6 peering, interface (unnumbered or link-local with interface) | |
632 | * takes precedence over VRF. For IPv4 peering, explicit interface or | |
633 | * VRF are the situations to bind. | |
634 | */ | |
635 | if (peer->su.sa.sa_family == AF_INET6) | |
636 | name = (peer->conf_if ? peer->conf_if | |
637 | : (peer->ifname ? peer->ifname | |
638 | : peer->bgp->name)); | |
639 | else | |
640 | name = peer->ifname ? peer->ifname : peer->bgp->name; | |
641 | ||
97896a91 | 642 | return name; |
718e3744 | 643 | } |
644 | ||
d62a17ae | 645 | static int bgp_update_address(struct interface *ifp, const union sockunion *dst, |
646 | union sockunion *addr) | |
718e3744 | 647 | { |
d62a17ae | 648 | struct prefix *p, *sel, d; |
649 | struct connected *connected; | |
650 | struct listnode *node; | |
651 | int common; | |
652 | ||
0154d8ce DS |
653 | if (!sockunion2hostprefix(dst, &d)) |
654 | return 1; | |
655 | ||
d62a17ae | 656 | sel = NULL; |
657 | common = -1; | |
658 | ||
659 | for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected)) { | |
660 | p = connected->address; | |
661 | if (p->family != d.family) | |
662 | continue; | |
663 | if (prefix_common_bits(p, &d) > common) { | |
664 | sel = p; | |
665 | common = prefix_common_bits(sel, &d); | |
666 | } | |
667 | } | |
668 | ||
669 | if (!sel) | |
670 | return 1; | |
671 | ||
672 | prefix2sockunion(sel, addr); | |
673 | return 0; | |
718e3744 | 674 | } |
675 | ||
676 | /* Update source selection. */ | |
d62a17ae | 677 | static int bgp_update_source(struct peer *peer) |
718e3744 | 678 | { |
d62a17ae | 679 | struct interface *ifp; |
680 | union sockunion addr; | |
681 | int ret = 0; | |
718e3744 | 682 | |
d62a17ae | 683 | sockunion_init(&addr); |
dd793e4a | 684 | |
d62a17ae | 685 | /* Source is specified with interface name. */ |
686 | if (peer->update_if) { | |
a36898e7 | 687 | ifp = if_lookup_by_name(peer->update_if, peer->bgp->vrf_id); |
d62a17ae | 688 | if (!ifp) |
689 | return -1; | |
718e3744 | 690 | |
d62a17ae | 691 | if (bgp_update_address(ifp, &peer->su, &addr)) |
692 | return -1; | |
718e3744 | 693 | |
d62a17ae | 694 | ret = sockunion_bind(peer->fd, &addr, 0, &addr); |
695 | } | |
718e3744 | 696 | |
d62a17ae | 697 | /* Source is specified with IP address. */ |
698 | if (peer->update_source) | |
699 | ret = sockunion_bind(peer->fd, peer->update_source, 0, | |
700 | peer->update_source); | |
49067496 | 701 | |
d62a17ae | 702 | return ret; |
718e3744 | 703 | } |
704 | ||
705 | /* BGP try to connect to the peer. */ | |
d62a17ae | 706 | int bgp_connect(struct peer *peer) |
718e3744 | 707 | { |
b750b0ba QY |
708 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); |
709 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); | |
d62a17ae | 710 | ifindex_t ifindex = 0; |
711 | ||
712 | if (peer->conf_if && BGP_PEER_SU_UNSPEC(peer)) { | |
713 | zlog_debug("Peer address not learnt: Returning from connect"); | |
714 | return 0; | |
715 | } | |
0cf6db21 | 716 | frr_with_privs(&bgpd_privs) { |
d62a17ae | 717 | /* Make socket for the peer. */ |
01b9e3fd DL |
718 | peer->fd = vrf_sockunion_socket(&peer->su, peer->bgp->vrf_id, |
719 | bgp_get_bound_name(peer)); | |
720 | } | |
d62a17ae | 721 | if (peer->fd < 0) |
722 | return -1; | |
723 | ||
724 | set_nonblocking(peer->fd); | |
725 | ||
c2d020ad | 726 | bgp_socket_set_buffer_size(peer->fd); |
d62a17ae | 727 | |
728 | if (bgp_set_socket_ttl(peer, peer->fd) < 0) | |
729 | return -1; | |
730 | ||
731 | sockopt_reuseaddr(peer->fd); | |
732 | sockopt_reuseport(peer->fd); | |
d62a17ae | 733 | |
1423c809 | 734 | #ifdef IPTOS_PREC_INTERNETCONTROL |
0cf6db21 | 735 | frr_with_privs(&bgpd_privs) { |
01b9e3fd | 736 | if (sockunion_family(&peer->su) == AF_INET) |
633fc9b1 DL |
737 | setsockopt_ipv4_tos(peer->fd, |
738 | IPTOS_PREC_INTERNETCONTROL); | |
01b9e3fd | 739 | else if (sockunion_family(&peer->su) == AF_INET6) |
633fc9b1 DL |
740 | setsockopt_ipv6_tclass(peer->fd, |
741 | IPTOS_PREC_INTERNETCONTROL); | |
01b9e3fd | 742 | } |
1423c809 SH |
743 | #endif |
744 | ||
9e7d9a61 QY |
745 | if (peer->password) { |
746 | uint16_t prefixlen = peer->su.sa.sa_family == AF_INET | |
747 | ? IPV4_MAX_PREFIXLEN | |
748 | : IPV6_MAX_PREFIXLEN; | |
749 | ||
750 | bgp_md5_set_connect(peer->fd, &peer->su, prefixlen, | |
751 | peer->password); | |
752 | } | |
718e3744 | 753 | |
d62a17ae | 754 | /* Update source bind. */ |
755 | if (bgp_update_source(peer) < 0) { | |
756 | return connect_error; | |
757 | } | |
718e3744 | 758 | |
d62a17ae | 759 | if (peer->conf_if || peer->ifname) |
760 | ifindex = ifname2ifindex(peer->conf_if ? peer->conf_if | |
761 | : peer->ifname, | |
762 | peer->bgp->vrf_id); | |
718e3744 | 763 | |
d62a17ae | 764 | if (bgp_debug_neighbor_events(peer)) |
765 | zlog_debug("%s [Event] Connect start to %s fd %d", peer->host, | |
766 | peer->host, peer->fd); | |
718e3744 | 767 | |
d62a17ae | 768 | /* Connect to the remote peer. */ |
769 | return sockunion_connect(peer->fd, &peer->su, htons(peer->port), | |
770 | ifindex); | |
718e3744 | 771 | } |
772 | ||
773 | /* After TCP connection is established. Get local address and port. */ | |
d62a17ae | 774 | int bgp_getsockname(struct peer *peer) |
718e3744 | 775 | { |
d62a17ae | 776 | if (peer->su_local) { |
777 | sockunion_free(peer->su_local); | |
778 | peer->su_local = NULL; | |
779 | } | |
780 | ||
781 | if (peer->su_remote) { | |
782 | sockunion_free(peer->su_remote); | |
783 | peer->su_remote = NULL; | |
784 | } | |
785 | ||
786 | peer->su_local = sockunion_getsockname(peer->fd); | |
787 | if (!peer->su_local) | |
788 | return -1; | |
789 | peer->su_remote = sockunion_getpeername(peer->fd); | |
790 | if (!peer->su_remote) | |
791 | return -1; | |
792 | ||
17cdd31e DS |
793 | if (!bgp_zebra_nexthop_set(peer->su_local, peer->su_remote, |
794 | &peer->nexthop, peer)) { | |
2564f080 | 795 | flog_err(EC_BGP_NH_UPD, |
17cdd31e DS |
796 | "%s: nexthop_set failed, resetting connection - intf %p", |
797 | peer->host, peer->nexthop.ifp); | |
d62a17ae | 798 | return -1; |
d62a17ae | 799 | } |
d62a17ae | 800 | return 0; |
718e3744 | 801 | } |
802 | ||
d023aec4 | 803 | |
61cf4b37 PG |
804 | static int bgp_listener(int sock, struct sockaddr *sa, socklen_t salen, |
805 | struct bgp *bgp) | |
d023aec4 | 806 | { |
d62a17ae | 807 | struct bgp_listener *listener; |
808 | int ret, en; | |
d023aec4 | 809 | |
d62a17ae | 810 | sockopt_reuseaddr(sock); |
811 | sockopt_reuseport(sock); | |
d023aec4 | 812 | |
0cf6db21 | 813 | frr_with_privs(&bgpd_privs) { |
5c88f19d | 814 | |
d023aec4 | 815 | #ifdef IPTOS_PREC_INTERNETCONTROL |
01b9e3fd DL |
816 | if (sa->sa_family == AF_INET) |
817 | setsockopt_ipv4_tos(sock, IPTOS_PREC_INTERNETCONTROL); | |
818 | else if (sa->sa_family == AF_INET6) | |
633fc9b1 DL |
819 | setsockopt_ipv6_tclass(sock, |
820 | IPTOS_PREC_INTERNETCONTROL); | |
d023aec4 SH |
821 | #endif |
822 | ||
01b9e3fd | 823 | sockopt_v6only(sa->sa_family, sock); |
d62a17ae | 824 | |
01b9e3fd DL |
825 | ret = bind(sock, sa, salen); |
826 | en = errno; | |
827 | } | |
d62a17ae | 828 | |
829 | if (ret < 0) { | |
450971aa | 830 | flog_err_sys(EC_LIB_SOCKET, "bind: %s", safe_strerror(en)); |
d62a17ae | 831 | return ret; |
832 | } | |
833 | ||
48522088 | 834 | ret = listen(sock, SOMAXCONN); |
d62a17ae | 835 | if (ret < 0) { |
1c50c1c0 | 836 | flog_err_sys(EC_LIB_SOCKET, "listen: %s", safe_strerror(errno)); |
d62a17ae | 837 | return ret; |
838 | } | |
839 | ||
61cf4b37 | 840 | listener = XCALLOC(MTYPE_BGP_LISTENER, sizeof(*listener)); |
d62a17ae | 841 | listener->fd = sock; |
2a0e69ae | 842 | listener->name = XSTRDUP(MTYPE_BGP_LISTENER, bgp->name); |
61cf4b37 | 843 | |
a4faae3a PR |
844 | /* this socket is in a vrf record bgp back pointer */ |
845 | if (bgp->vrf_id != VRF_DEFAULT | |
846 | && bgp->inst_type != BGP_INSTANCE_TYPE_VIEW) | |
61cf4b37 PG |
847 | listener->bgp = bgp; |
848 | ||
d62a17ae | 849 | memcpy(&listener->su, sa, salen); |
850 | listener->thread = NULL; | |
851 | thread_add_read(bm->master, bgp_accept, listener, sock, | |
852 | &listener->thread); | |
853 | listnode_add(bm->listen_sockets, listener); | |
854 | ||
855 | return 0; | |
d023aec4 SH |
856 | } |
857 | ||
718e3744 | 858 | /* IPv6 supported version of BGP server socket setup. */ |
61cf4b37 | 859 | int bgp_socket(struct bgp *bgp, unsigned short port, const char *address) |
718e3744 | 860 | { |
d62a17ae | 861 | struct addrinfo *ainfo; |
862 | struct addrinfo *ainfo_save; | |
863 | static const struct addrinfo req = { | |
864 | .ai_family = AF_UNSPEC, | |
865 | .ai_flags = AI_PASSIVE, | |
866 | .ai_socktype = SOCK_STREAM, | |
867 | }; | |
868 | int ret, count; | |
869 | char port_str[BUFSIZ]; | |
870 | ||
871 | snprintf(port_str, sizeof(port_str), "%d", port); | |
872 | port_str[sizeof(port_str) - 1] = '\0'; | |
873 | ||
0cf6db21 | 874 | frr_with_privs(&bgpd_privs) { |
01b9e3fd DL |
875 | ret = vrf_getaddrinfo(address, port_str, &req, &ainfo_save, |
876 | bgp->vrf_id); | |
877 | } | |
d62a17ae | 878 | if (ret != 0) { |
450971aa | 879 | flog_err_sys(EC_LIB_SOCKET, "getaddrinfo: %s", |
09c866e3 | 880 | gai_strerror(ret)); |
d62a17ae | 881 | return -1; |
882 | } | |
0b014ea6 | 883 | if (bgp_option_check(BGP_OPT_NO_ZEBRA) && |
449cff3e A |
884 | bgp->vrf_id != VRF_DEFAULT) { |
885 | freeaddrinfo(ainfo_save); | |
0b014ea6 | 886 | return -1; |
449cff3e | 887 | } |
d62a17ae | 888 | count = 0; |
889 | for (ainfo = ainfo_save; ainfo; ainfo = ainfo->ai_next) { | |
890 | int sock; | |
891 | ||
892 | if (ainfo->ai_family != AF_INET && ainfo->ai_family != AF_INET6) | |
893 | continue; | |
894 | ||
0cf6db21 | 895 | frr_with_privs(&bgpd_privs) { |
01b9e3fd DL |
896 | sock = vrf_socket(ainfo->ai_family, |
897 | ainfo->ai_socktype, | |
898 | ainfo->ai_protocol, bgp->vrf_id, | |
633fc9b1 DL |
899 | (bgp->inst_type |
900 | == BGP_INSTANCE_TYPE_VRF | |
901 | ? bgp->name : NULL)); | |
01b9e3fd | 902 | } |
d62a17ae | 903 | if (sock < 0) { |
450971aa | 904 | flog_err_sys(EC_LIB_SOCKET, "socket: %s", |
09c866e3 | 905 | safe_strerror(errno)); |
d62a17ae | 906 | continue; |
907 | } | |
908 | ||
909 | /* if we intend to implement ttl-security, this socket needs | |
910 | * ttl=255 */ | |
911 | sockopt_ttl(ainfo->ai_family, sock, MAXTTL); | |
912 | ||
996c9314 LB |
913 | ret = bgp_listener(sock, ainfo->ai_addr, ainfo->ai_addrlen, |
914 | bgp); | |
d62a17ae | 915 | if (ret == 0) |
916 | ++count; | |
917 | else | |
918 | close(sock); | |
919 | } | |
920 | freeaddrinfo(ainfo_save); | |
06969768 | 921 | if (count == 0 && bgp->inst_type != BGP_INSTANCE_TYPE_VRF) { |
af4c2728 | 922 | flog_err( |
450971aa | 923 | EC_LIB_SOCKET, |
996c9314 LB |
924 | "%s: no usable addresses please check other programs usage of specified port %d", |
925 | __func__, port); | |
450971aa | 926 | flog_err_sys(EC_LIB_SOCKET, "%s: Program cannot continue", |
09c866e3 | 927 | __func__); |
b3b78f6e | 928 | exit(-1); |
d62a17ae | 929 | } |
930 | ||
931 | return 0; | |
718e3744 | 932 | } |
d023aec4 | 933 | |
e5619c28 PG |
934 | /* this function closes vrf socket |
935 | * this should be called only for vrf socket with netns backend | |
936 | */ | |
937 | void bgp_close_vrf_socket(struct bgp *bgp) | |
938 | { | |
939 | struct listnode *node, *next; | |
940 | struct bgp_listener *listener; | |
941 | ||
942 | if (!bgp) | |
943 | return; | |
944 | ||
945 | if (bm->listen_sockets == NULL) | |
946 | return; | |
947 | ||
948 | for (ALL_LIST_ELEMENTS(bm->listen_sockets, node, next, listener)) { | |
949 | if (listener->bgp == bgp) { | |
2f9db11b | 950 | THREAD_OFF(listener->thread); |
e5619c28 PG |
951 | close(listener->fd); |
952 | listnode_delete(bm->listen_sockets, listener); | |
2a0e69ae | 953 | XFREE(MTYPE_BGP_LISTENER, listener->name); |
e5619c28 PG |
954 | XFREE(MTYPE_BGP_LISTENER, listener); |
955 | } | |
956 | } | |
957 | } | |
958 | ||
959 | /* this function closes main socket | |
960 | */ | |
d62a17ae | 961 | void bgp_close(void) |
d023aec4 | 962 | { |
d62a17ae | 963 | struct listnode *node, *next; |
964 | struct bgp_listener *listener; | |
965 | ||
966 | if (bm->listen_sockets == NULL) | |
967 | return; | |
968 | ||
969 | for (ALL_LIST_ELEMENTS(bm->listen_sockets, node, next, listener)) { | |
e5619c28 PG |
970 | if (listener->bgp) |
971 | continue; | |
e2d409a8 | 972 | THREAD_OFF(listener->thread); |
d62a17ae | 973 | close(listener->fd); |
974 | listnode_delete(bm->listen_sockets, listener); | |
2a0e69ae | 975 | XFREE(MTYPE_BGP_LISTENER, listener->name); |
d62a17ae | 976 | XFREE(MTYPE_BGP_LISTENER, listener); |
977 | } | |
d023aec4 | 978 | } |