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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 | ||
460 | if (peer_active(peer1)) | |
461 | BGP_EVENT_ADD(peer1, TCP_connection_open); | |
462 | ||
463 | return 0; | |
464 | } | |
465 | } | |
466 | ||
467 | if (!peer1) { | |
468 | if (bgp_debug_neighbor_events(NULL)) { | |
469 | zlog_debug( | |
45069622 DS |
470 | "[Event] %s connection rejected(%s:%u:%s) - not configured and not valid for dynamic", |
471 | inet_sutop(&su, buf), bgp->name_pretty, bgp->as, | |
472 | VRF_LOGNAME(vrf_lookup_by_id(bgp->vrf_id))); | |
d62a17ae | 473 | } |
474 | close(bgp_sock); | |
475 | return -1; | |
476 | } | |
477 | ||
cb9196e7 DS |
478 | if (CHECK_FLAG(peer1->flags, PEER_FLAG_SHUTDOWN) |
479 | || CHECK_FLAG(peer1->bgp->flags, BGP_FLAG_SHUTDOWN)) { | |
d62a17ae | 480 | if (bgp_debug_neighbor_events(peer1)) |
481 | zlog_debug( | |
45069622 DS |
482 | "[Event] connection from %s rejected(%s:%u:%s) due to admin shutdown", |
483 | inet_sutop(&su, buf), bgp->name_pretty, bgp->as, | |
484 | VRF_LOGNAME(vrf_lookup_by_id(bgp->vrf_id))); | |
d62a17ae | 485 | close(bgp_sock); |
486 | return -1; | |
487 | } | |
488 | ||
489 | /* | |
490 | * Do not accept incoming connections in Clearing state. This can result | |
491 | * in incorect state transitions - e.g., the connection goes back to | |
492 | * Established and then the Clearing_Completed event is generated. Also, | |
493 | * block incoming connection in Deleted state. | |
494 | */ | |
495 | if (peer1->status == Clearing || peer1->status == Deleted) { | |
496 | if (bgp_debug_neighbor_events(peer1)) | |
497 | zlog_debug( | |
498 | "[Event] Closing incoming conn for %s (%p) state %d", | |
499 | peer1->host, peer1, peer1->status); | |
500 | close(bgp_sock); | |
501 | return -1; | |
502 | } | |
503 | ||
504 | /* Check that at least one AF is activated for the peer. */ | |
505 | if (!peer_active(peer1)) { | |
506 | if (bgp_debug_neighbor_events(peer1)) | |
507 | zlog_debug( | |
508 | "%s - incoming conn rejected - no AF activated for peer", | |
509 | peer1->host); | |
510 | close(bgp_sock); | |
511 | return -1; | |
512 | } | |
513 | ||
d091d9ad DA |
514 | /* Do not try to reconnect if the peer reached maximum |
515 | * prefixes, restart timer is still running or the peer | |
516 | * is shutdown. | |
517 | */ | |
518 | if (BGP_PEER_START_SUPPRESSED(peer1)) { | |
497b686a MS |
519 | if (bgp_debug_neighbor_events(peer1)) |
520 | zlog_debug( | |
3efd0893 | 521 | "[Event] Incoming BGP connection rejected from %s due to maximum-prefix or shutdown", |
497b686a MS |
522 | peer1->host); |
523 | close(bgp_sock); | |
524 | return -1; | |
525 | } | |
526 | ||
d62a17ae | 527 | if (bgp_debug_neighbor_events(peer1)) |
528 | zlog_debug("[Event] BGP connection from host %s fd %d", | |
529 | inet_sutop(&su, buf), bgp_sock); | |
530 | ||
531 | if (peer1->doppelganger) { | |
532 | /* We have an existing connection. Kill the existing one and run | |
533 | with this one. | |
534 | */ | |
535 | if (bgp_debug_neighbor_events(peer1)) | |
536 | zlog_debug( | |
3efd0893 | 537 | "[Event] New active connection from peer %s, Killing previous active connection", |
d62a17ae | 538 | peer1->host); |
539 | peer_delete(peer1->doppelganger); | |
540 | } | |
541 | ||
542 | if (bgp_set_socket_ttl(peer1, bgp_sock) < 0) | |
543 | if (bgp_debug_neighbor_events(peer1)) | |
544 | zlog_debug( | |
545 | "[Event] Unable to set min/max TTL on peer %s, Continuing", | |
546 | peer1->host); | |
547 | ||
548 | peer = peer_create(&su, peer1->conf_if, peer1->bgp, peer1->local_as, | |
549 | peer1->as, peer1->as_type, 0, 0, NULL); | |
d62a17ae | 550 | hash_release(peer->bgp->peerhash, peer); |
551 | hash_get(peer->bgp->peerhash, peer, hash_alloc_intern); | |
552 | ||
553 | peer_xfer_config(peer, peer1); | |
d7b3cda6 | 554 | bgp_peer_gr_flags_update(peer); |
555 | ||
36235319 QY |
556 | BGP_GR_ROUTER_DETECT_AND_SEND_CAPABILITY_TO_ZEBRA(peer->bgp, |
557 | peer->bgp->peer); | |
0f0444fb | 558 | |
d7b3cda6 | 559 | if (bgp_peer_gr_mode_get(peer) == PEER_DISABLE) { |
560 | ||
561 | UNSET_FLAG(peer->sflags, PEER_STATUS_NSF_MODE); | |
562 | ||
36235319 | 563 | if (CHECK_FLAG(peer->sflags, PEER_STATUS_NSF_WAIT)) { |
d7b3cda6 | 564 | peer_nsf_stop(peer); |
565 | } | |
566 | } | |
567 | ||
d62a17ae | 568 | UNSET_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE); |
569 | ||
570 | peer->doppelganger = peer1; | |
571 | peer1->doppelganger = peer; | |
572 | peer->fd = bgp_sock; | |
97896a91 | 573 | vrf_bind(peer->bgp->vrf_id, bgp_sock, bgp_get_bound_name(peer)); |
d62a17ae | 574 | bgp_fsm_change_status(peer, Active); |
575 | BGP_TIMER_OFF(peer->t_start); /* created in peer_create() */ | |
576 | ||
577 | SET_FLAG(peer->sflags, PEER_STATUS_ACCEPT_PEER); | |
d62a17ae | 578 | /* Make dummy peer until read Open packet. */ |
579 | if (peer1->status == Established | |
36235319 | 580 | && CHECK_FLAG(peer1->sflags, PEER_STATUS_NSF_MODE)) { |
d62a17ae | 581 | /* If we have an existing established connection with graceful |
582 | * restart | |
583 | * capability announced with one or more address families, then | |
584 | * drop | |
585 | * existing established connection and move state to connect. | |
586 | */ | |
587 | peer1->last_reset = PEER_DOWN_NSF_CLOSE_SESSION; | |
d7b3cda6 | 588 | |
36235319 QY |
589 | if (CHECK_FLAG(peer1->flags, PEER_FLAG_GRACEFUL_RESTART) |
590 | || CHECK_FLAG(peer1->flags, | |
591 | PEER_FLAG_GRACEFUL_RESTART_HELPER)) | |
592 | SET_FLAG(peer1->sflags, PEER_STATUS_NSF_WAIT); | |
d7b3cda6 | 593 | |
d62a17ae | 594 | bgp_event_update(peer1, TCP_connection_closed); |
595 | } | |
596 | ||
597 | if (peer_active(peer)) { | |
598 | BGP_EVENT_ADD(peer, TCP_connection_open); | |
599 | } | |
600 | ||
601 | return 0; | |
718e3744 | 602 | } |
603 | ||
604 | /* BGP socket bind. */ | |
97896a91 | 605 | static char *bgp_get_bound_name(struct peer *peer) |
718e3744 | 606 | { |
d62a17ae | 607 | char *name = NULL; |
608 | ||
a2bce1c8 DS |
609 | if (!peer) |
610 | return NULL; | |
611 | ||
996c9314 LB |
612 | if ((peer->bgp->vrf_id == VRF_DEFAULT) && !peer->ifname |
613 | && !peer->conf_if) | |
97896a91 PG |
614 | return NULL; |
615 | ||
d62a17ae | 616 | if (peer->su.sa.sa_family != AF_INET |
617 | && peer->su.sa.sa_family != AF_INET6) | |
97896a91 | 618 | return NULL; // unexpected |
d62a17ae | 619 | |
620 | /* For IPv6 peering, interface (unnumbered or link-local with interface) | |
621 | * takes precedence over VRF. For IPv4 peering, explicit interface or | |
622 | * VRF are the situations to bind. | |
623 | */ | |
624 | if (peer->su.sa.sa_family == AF_INET6) | |
625 | name = (peer->conf_if ? peer->conf_if | |
626 | : (peer->ifname ? peer->ifname | |
627 | : peer->bgp->name)); | |
628 | else | |
629 | name = peer->ifname ? peer->ifname : peer->bgp->name; | |
630 | ||
97896a91 | 631 | return name; |
718e3744 | 632 | } |
633 | ||
d62a17ae | 634 | static int bgp_update_address(struct interface *ifp, const union sockunion *dst, |
635 | union sockunion *addr) | |
718e3744 | 636 | { |
d62a17ae | 637 | struct prefix *p, *sel, d; |
638 | struct connected *connected; | |
639 | struct listnode *node; | |
640 | int common; | |
641 | ||
0154d8ce DS |
642 | if (!sockunion2hostprefix(dst, &d)) |
643 | return 1; | |
644 | ||
d62a17ae | 645 | sel = NULL; |
646 | common = -1; | |
647 | ||
648 | for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected)) { | |
649 | p = connected->address; | |
650 | if (p->family != d.family) | |
651 | continue; | |
652 | if (prefix_common_bits(p, &d) > common) { | |
653 | sel = p; | |
654 | common = prefix_common_bits(sel, &d); | |
655 | } | |
656 | } | |
657 | ||
658 | if (!sel) | |
659 | return 1; | |
660 | ||
661 | prefix2sockunion(sel, addr); | |
662 | return 0; | |
718e3744 | 663 | } |
664 | ||
665 | /* Update source selection. */ | |
d62a17ae | 666 | static int bgp_update_source(struct peer *peer) |
718e3744 | 667 | { |
d62a17ae | 668 | struct interface *ifp; |
669 | union sockunion addr; | |
670 | int ret = 0; | |
718e3744 | 671 | |
d62a17ae | 672 | sockunion_init(&addr); |
dd793e4a | 673 | |
d62a17ae | 674 | /* Source is specified with interface name. */ |
675 | if (peer->update_if) { | |
a36898e7 | 676 | ifp = if_lookup_by_name(peer->update_if, peer->bgp->vrf_id); |
d62a17ae | 677 | if (!ifp) |
678 | return -1; | |
718e3744 | 679 | |
d62a17ae | 680 | if (bgp_update_address(ifp, &peer->su, &addr)) |
681 | return -1; | |
718e3744 | 682 | |
d62a17ae | 683 | ret = sockunion_bind(peer->fd, &addr, 0, &addr); |
684 | } | |
718e3744 | 685 | |
d62a17ae | 686 | /* Source is specified with IP address. */ |
687 | if (peer->update_source) | |
688 | ret = sockunion_bind(peer->fd, peer->update_source, 0, | |
689 | peer->update_source); | |
49067496 | 690 | |
d62a17ae | 691 | return ret; |
718e3744 | 692 | } |
693 | ||
694 | /* BGP try to connect to the peer. */ | |
d62a17ae | 695 | int bgp_connect(struct peer *peer) |
718e3744 | 696 | { |
b750b0ba QY |
697 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_WRITES_ON)); |
698 | assert(!CHECK_FLAG(peer->thread_flags, PEER_THREAD_READS_ON)); | |
d62a17ae | 699 | ifindex_t ifindex = 0; |
700 | ||
701 | if (peer->conf_if && BGP_PEER_SU_UNSPEC(peer)) { | |
702 | zlog_debug("Peer address not learnt: Returning from connect"); | |
703 | return 0; | |
704 | } | |
0cf6db21 | 705 | frr_with_privs(&bgpd_privs) { |
d62a17ae | 706 | /* Make socket for the peer. */ |
01b9e3fd DL |
707 | peer->fd = vrf_sockunion_socket(&peer->su, peer->bgp->vrf_id, |
708 | bgp_get_bound_name(peer)); | |
709 | } | |
d62a17ae | 710 | if (peer->fd < 0) |
711 | return -1; | |
712 | ||
713 | set_nonblocking(peer->fd); | |
714 | ||
c2d020ad | 715 | bgp_socket_set_buffer_size(peer->fd); |
d62a17ae | 716 | |
717 | if (bgp_set_socket_ttl(peer, peer->fd) < 0) | |
718 | return -1; | |
719 | ||
720 | sockopt_reuseaddr(peer->fd); | |
721 | sockopt_reuseport(peer->fd); | |
d62a17ae | 722 | |
1423c809 | 723 | #ifdef IPTOS_PREC_INTERNETCONTROL |
0cf6db21 | 724 | frr_with_privs(&bgpd_privs) { |
01b9e3fd | 725 | if (sockunion_family(&peer->su) == AF_INET) |
633fc9b1 DL |
726 | setsockopt_ipv4_tos(peer->fd, |
727 | IPTOS_PREC_INTERNETCONTROL); | |
01b9e3fd | 728 | else if (sockunion_family(&peer->su) == AF_INET6) |
633fc9b1 DL |
729 | setsockopt_ipv6_tclass(peer->fd, |
730 | IPTOS_PREC_INTERNETCONTROL); | |
01b9e3fd | 731 | } |
1423c809 SH |
732 | #endif |
733 | ||
9e7d9a61 QY |
734 | if (peer->password) { |
735 | uint16_t prefixlen = peer->su.sa.sa_family == AF_INET | |
736 | ? IPV4_MAX_PREFIXLEN | |
737 | : IPV6_MAX_PREFIXLEN; | |
738 | ||
739 | bgp_md5_set_connect(peer->fd, &peer->su, prefixlen, | |
740 | peer->password); | |
741 | } | |
718e3744 | 742 | |
d62a17ae | 743 | /* Update source bind. */ |
744 | if (bgp_update_source(peer) < 0) { | |
745 | return connect_error; | |
746 | } | |
718e3744 | 747 | |
d62a17ae | 748 | if (peer->conf_if || peer->ifname) |
749 | ifindex = ifname2ifindex(peer->conf_if ? peer->conf_if | |
750 | : peer->ifname, | |
751 | peer->bgp->vrf_id); | |
718e3744 | 752 | |
d62a17ae | 753 | if (bgp_debug_neighbor_events(peer)) |
754 | zlog_debug("%s [Event] Connect start to %s fd %d", peer->host, | |
755 | peer->host, peer->fd); | |
718e3744 | 756 | |
d62a17ae | 757 | /* Connect to the remote peer. */ |
758 | return sockunion_connect(peer->fd, &peer->su, htons(peer->port), | |
759 | ifindex); | |
718e3744 | 760 | } |
761 | ||
762 | /* After TCP connection is established. Get local address and port. */ | |
d62a17ae | 763 | int bgp_getsockname(struct peer *peer) |
718e3744 | 764 | { |
d62a17ae | 765 | if (peer->su_local) { |
766 | sockunion_free(peer->su_local); | |
767 | peer->su_local = NULL; | |
768 | } | |
769 | ||
770 | if (peer->su_remote) { | |
771 | sockunion_free(peer->su_remote); | |
772 | peer->su_remote = NULL; | |
773 | } | |
774 | ||
775 | peer->su_local = sockunion_getsockname(peer->fd); | |
776 | if (!peer->su_local) | |
777 | return -1; | |
778 | peer->su_remote = sockunion_getpeername(peer->fd); | |
779 | if (!peer->su_remote) | |
780 | return -1; | |
781 | ||
17cdd31e DS |
782 | if (!bgp_zebra_nexthop_set(peer->su_local, peer->su_remote, |
783 | &peer->nexthop, peer)) { | |
2564f080 | 784 | flog_err(EC_BGP_NH_UPD, |
17cdd31e DS |
785 | "%s: nexthop_set failed, resetting connection - intf %p", |
786 | peer->host, peer->nexthop.ifp); | |
d62a17ae | 787 | return -1; |
d62a17ae | 788 | } |
d62a17ae | 789 | return 0; |
718e3744 | 790 | } |
791 | ||
d023aec4 | 792 | |
61cf4b37 PG |
793 | static int bgp_listener(int sock, struct sockaddr *sa, socklen_t salen, |
794 | struct bgp *bgp) | |
d023aec4 | 795 | { |
d62a17ae | 796 | struct bgp_listener *listener; |
797 | int ret, en; | |
d023aec4 | 798 | |
d62a17ae | 799 | sockopt_reuseaddr(sock); |
800 | sockopt_reuseport(sock); | |
d023aec4 | 801 | |
0cf6db21 | 802 | frr_with_privs(&bgpd_privs) { |
5c88f19d | 803 | |
d023aec4 | 804 | #ifdef IPTOS_PREC_INTERNETCONTROL |
01b9e3fd DL |
805 | if (sa->sa_family == AF_INET) |
806 | setsockopt_ipv4_tos(sock, IPTOS_PREC_INTERNETCONTROL); | |
807 | else if (sa->sa_family == AF_INET6) | |
633fc9b1 DL |
808 | setsockopt_ipv6_tclass(sock, |
809 | IPTOS_PREC_INTERNETCONTROL); | |
d023aec4 SH |
810 | #endif |
811 | ||
01b9e3fd | 812 | sockopt_v6only(sa->sa_family, sock); |
d62a17ae | 813 | |
01b9e3fd DL |
814 | ret = bind(sock, sa, salen); |
815 | en = errno; | |
816 | } | |
d62a17ae | 817 | |
818 | if (ret < 0) { | |
450971aa | 819 | flog_err_sys(EC_LIB_SOCKET, "bind: %s", safe_strerror(en)); |
d62a17ae | 820 | return ret; |
821 | } | |
822 | ||
48522088 | 823 | ret = listen(sock, SOMAXCONN); |
d62a17ae | 824 | if (ret < 0) { |
1c50c1c0 | 825 | flog_err_sys(EC_LIB_SOCKET, "listen: %s", safe_strerror(errno)); |
d62a17ae | 826 | return ret; |
827 | } | |
828 | ||
61cf4b37 | 829 | listener = XCALLOC(MTYPE_BGP_LISTENER, sizeof(*listener)); |
d62a17ae | 830 | listener->fd = sock; |
2a0e69ae | 831 | listener->name = XSTRDUP(MTYPE_BGP_LISTENER, bgp->name); |
61cf4b37 | 832 | |
a4faae3a PR |
833 | /* this socket is in a vrf record bgp back pointer */ |
834 | if (bgp->vrf_id != VRF_DEFAULT | |
835 | && bgp->inst_type != BGP_INSTANCE_TYPE_VIEW) | |
61cf4b37 PG |
836 | listener->bgp = bgp; |
837 | ||
d62a17ae | 838 | memcpy(&listener->su, sa, salen); |
839 | listener->thread = NULL; | |
840 | thread_add_read(bm->master, bgp_accept, listener, sock, | |
841 | &listener->thread); | |
842 | listnode_add(bm->listen_sockets, listener); | |
843 | ||
844 | return 0; | |
d023aec4 SH |
845 | } |
846 | ||
718e3744 | 847 | /* IPv6 supported version of BGP server socket setup. */ |
61cf4b37 | 848 | int bgp_socket(struct bgp *bgp, unsigned short port, const char *address) |
718e3744 | 849 | { |
d62a17ae | 850 | struct addrinfo *ainfo; |
851 | struct addrinfo *ainfo_save; | |
852 | static const struct addrinfo req = { | |
853 | .ai_family = AF_UNSPEC, | |
854 | .ai_flags = AI_PASSIVE, | |
855 | .ai_socktype = SOCK_STREAM, | |
856 | }; | |
857 | int ret, count; | |
858 | char port_str[BUFSIZ]; | |
859 | ||
860 | snprintf(port_str, sizeof(port_str), "%d", port); | |
861 | port_str[sizeof(port_str) - 1] = '\0'; | |
862 | ||
0cf6db21 | 863 | frr_with_privs(&bgpd_privs) { |
01b9e3fd DL |
864 | ret = vrf_getaddrinfo(address, port_str, &req, &ainfo_save, |
865 | bgp->vrf_id); | |
866 | } | |
d62a17ae | 867 | if (ret != 0) { |
450971aa | 868 | flog_err_sys(EC_LIB_SOCKET, "getaddrinfo: %s", |
09c866e3 | 869 | gai_strerror(ret)); |
d62a17ae | 870 | return -1; |
871 | } | |
0b014ea6 | 872 | if (bgp_option_check(BGP_OPT_NO_ZEBRA) && |
449cff3e A |
873 | bgp->vrf_id != VRF_DEFAULT) { |
874 | freeaddrinfo(ainfo_save); | |
0b014ea6 | 875 | return -1; |
449cff3e | 876 | } |
d62a17ae | 877 | count = 0; |
878 | for (ainfo = ainfo_save; ainfo; ainfo = ainfo->ai_next) { | |
879 | int sock; | |
880 | ||
881 | if (ainfo->ai_family != AF_INET && ainfo->ai_family != AF_INET6) | |
882 | continue; | |
883 | ||
0cf6db21 | 884 | frr_with_privs(&bgpd_privs) { |
01b9e3fd DL |
885 | sock = vrf_socket(ainfo->ai_family, |
886 | ainfo->ai_socktype, | |
887 | ainfo->ai_protocol, bgp->vrf_id, | |
633fc9b1 DL |
888 | (bgp->inst_type |
889 | == BGP_INSTANCE_TYPE_VRF | |
890 | ? bgp->name : NULL)); | |
01b9e3fd | 891 | } |
d62a17ae | 892 | if (sock < 0) { |
450971aa | 893 | flog_err_sys(EC_LIB_SOCKET, "socket: %s", |
09c866e3 | 894 | safe_strerror(errno)); |
d62a17ae | 895 | continue; |
896 | } | |
897 | ||
898 | /* if we intend to implement ttl-security, this socket needs | |
899 | * ttl=255 */ | |
900 | sockopt_ttl(ainfo->ai_family, sock, MAXTTL); | |
901 | ||
996c9314 LB |
902 | ret = bgp_listener(sock, ainfo->ai_addr, ainfo->ai_addrlen, |
903 | bgp); | |
d62a17ae | 904 | if (ret == 0) |
905 | ++count; | |
906 | else | |
907 | close(sock); | |
908 | } | |
909 | freeaddrinfo(ainfo_save); | |
06969768 | 910 | if (count == 0 && bgp->inst_type != BGP_INSTANCE_TYPE_VRF) { |
af4c2728 | 911 | flog_err( |
450971aa | 912 | EC_LIB_SOCKET, |
996c9314 LB |
913 | "%s: no usable addresses please check other programs usage of specified port %d", |
914 | __func__, port); | |
450971aa | 915 | flog_err_sys(EC_LIB_SOCKET, "%s: Program cannot continue", |
09c866e3 | 916 | __func__); |
b3b78f6e | 917 | exit(-1); |
d62a17ae | 918 | } |
919 | ||
920 | return 0; | |
718e3744 | 921 | } |
d023aec4 | 922 | |
e5619c28 PG |
923 | /* this function closes vrf socket |
924 | * this should be called only for vrf socket with netns backend | |
925 | */ | |
926 | void bgp_close_vrf_socket(struct bgp *bgp) | |
927 | { | |
928 | struct listnode *node, *next; | |
929 | struct bgp_listener *listener; | |
930 | ||
931 | if (!bgp) | |
932 | return; | |
933 | ||
934 | if (bm->listen_sockets == NULL) | |
935 | return; | |
936 | ||
937 | for (ALL_LIST_ELEMENTS(bm->listen_sockets, node, next, listener)) { | |
938 | if (listener->bgp == bgp) { | |
2f9db11b | 939 | THREAD_OFF(listener->thread); |
e5619c28 PG |
940 | close(listener->fd); |
941 | listnode_delete(bm->listen_sockets, listener); | |
2a0e69ae | 942 | XFREE(MTYPE_BGP_LISTENER, listener->name); |
e5619c28 PG |
943 | XFREE(MTYPE_BGP_LISTENER, listener); |
944 | } | |
945 | } | |
946 | } | |
947 | ||
948 | /* this function closes main socket | |
949 | */ | |
d62a17ae | 950 | void bgp_close(void) |
d023aec4 | 951 | { |
d62a17ae | 952 | struct listnode *node, *next; |
953 | struct bgp_listener *listener; | |
954 | ||
955 | if (bm->listen_sockets == NULL) | |
956 | return; | |
957 | ||
958 | for (ALL_LIST_ELEMENTS(bm->listen_sockets, node, next, listener)) { | |
e5619c28 PG |
959 | if (listener->bgp) |
960 | continue; | |
e2d409a8 | 961 | THREAD_OFF(listener->thread); |
d62a17ae | 962 | close(listener->fd); |
963 | listnode_delete(bm->listen_sockets, listener); | |
2a0e69ae | 964 | XFREE(MTYPE_BGP_LISTENER, listener->name); |
d62a17ae | 965 | XFREE(MTYPE_BGP_LISTENER, listener); |
966 | } | |
d023aec4 | 967 | } |