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Commit | Line | Data |
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718e3744 | 1 | /* BGP network related fucntions |
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 | |
17 | along with GNU Zebra; see the file COPYING. If not, write to the Free | |
18 | Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
19 | 02111-1307, USA. */ | |
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" |
718e3744 | 35 | |
36 | #include "bgpd/bgpd.h" | |
1ff9a340 | 37 | #include "bgpd/bgp_open.h" |
718e3744 | 38 | #include "bgpd/bgp_fsm.h" |
39 | #include "bgpd/bgp_attr.h" | |
40 | #include "bgpd/bgp_debug.h" | |
41 | #include "bgpd/bgp_network.h" | |
edd7c245 | 42 | |
43 | extern struct zebra_privs_t bgpd_privs; | |
44 | ||
f2345335 DS |
45 | static int bgp_bind(struct peer *); |
46 | ||
d023aec4 SH |
47 | /* BGP listening socket. */ |
48 | struct bgp_listener | |
49 | { | |
50 | int fd; | |
51 | union sockunion su; | |
52 | struct thread *thread; | |
53 | }; | |
6b0655a2 | 54 | |
0df7c91f PJ |
55 | /* |
56 | * Set MD5 key for the socket, for the given IPv4 peer address. | |
57 | * If the password is NULL or zero-length, the option will be disabled. | |
58 | */ | |
59 | static int | |
60 | bgp_md5_set_socket (int socket, union sockunion *su, const char *password) | |
61 | { | |
62 | int ret = -1; | |
63 | int en = ENOSYS; | |
019cbf70 | 64 | union sockunion su2; |
0df7c91f PJ |
65 | |
66 | assert (socket >= 0); | |
67 | ||
68 | #if HAVE_DECL_TCP_MD5SIG | |
019cbf70 DS |
69 | /* Ensure there is no extraneous port information. */ |
70 | memcpy (&su2, su, sizeof (union sockunion)); | |
71 | if (su2.sa.sa_family == AF_INET) | |
72 | su2.sin.sin_port = 0; | |
73 | else | |
74 | su2.sin6.sin6_port = 0; | |
75 | ret = sockopt_tcp_signature (socket, &su2, password); | |
0df7c91f PJ |
76 | en = errno; |
77 | #endif /* HAVE_TCP_MD5SIG */ | |
78 | ||
79 | if (ret < 0) | |
16286195 | 80 | zlog_warn ("can't set TCP_MD5SIG option on socket %d: %s", socket, safe_strerror (en)); |
0df7c91f PJ |
81 | |
82 | return ret; | |
83 | } | |
84 | ||
85 | /* Helper for bgp_connect */ | |
86 | static int | |
87 | bgp_md5_set_connect (int socket, union sockunion *su, const char *password) | |
88 | { | |
89 | int ret = -1; | |
90 | ||
91 | #if HAVE_DECL_TCP_MD5SIG | |
92 | if ( bgpd_privs.change (ZPRIVS_RAISE) ) | |
93 | { | |
94 | zlog_err ("%s: could not raise privs", __func__); | |
95 | return ret; | |
96 | } | |
97 | ||
98 | ret = bgp_md5_set_socket (socket, su, password); | |
99 | ||
100 | if (bgpd_privs.change (ZPRIVS_LOWER) ) | |
101 | zlog_err ("%s: could not lower privs", __func__); | |
102 | #endif /* HAVE_TCP_MD5SIG */ | |
103 | ||
104 | return ret; | |
105 | } | |
106 | ||
89ca90fa | 107 | static int |
108 | bgp_md5_set_password (struct peer *peer, const char *password) | |
0df7c91f PJ |
109 | { |
110 | struct listnode *node; | |
d1c21cab SH |
111 | int ret = 0; |
112 | struct bgp_listener *listener; | |
0df7c91f PJ |
113 | |
114 | if ( bgpd_privs.change (ZPRIVS_RAISE) ) | |
115 | { | |
116 | zlog_err ("%s: could not raise privs", __func__); | |
117 | return -1; | |
118 | } | |
119 | ||
89ca90fa | 120 | /* Set or unset the password on the listen socket(s). Outbound connections |
0df7c91f PJ |
121 | * are taken care of in bgp_connect() below. |
122 | */ | |
d1c21cab SH |
123 | for (ALL_LIST_ELEMENTS_RO(bm->listen_sockets, node, listener)) |
124 | if (listener->su.sa.sa_family == peer->su.sa.sa_family) | |
125 | { | |
89ca90fa | 126 | ret = bgp_md5_set_socket (listener->fd, &peer->su, password); |
d1c21cab SH |
127 | break; |
128 | } | |
129 | ||
0df7c91f PJ |
130 | if (bgpd_privs.change (ZPRIVS_LOWER) ) |
131 | zlog_err ("%s: could not lower privs", __func__); | |
132 | ||
d1c21cab | 133 | return ret; |
0df7c91f | 134 | } |
3374bef0 | 135 | |
89ca90fa | 136 | int |
137 | bgp_md5_set (struct peer *peer) | |
138 | { | |
139 | /* Set the password from listen socket. */ | |
140 | return bgp_md5_set_password (peer, peer->password); | |
141 | } | |
142 | ||
143 | int | |
144 | bgp_md5_unset (struct peer *peer) | |
145 | { | |
146 | /* Unset the password from listen socket. */ | |
147 | return bgp_md5_set_password (peer, NULL); | |
148 | } | |
149 | ||
3374bef0 VK |
150 | /* Update BGP socket send buffer size */ |
151 | static void | |
152 | bgp_update_sock_send_buffer_size (int fd) | |
153 | { | |
154 | int size = BGP_SOCKET_SNDBUF_SIZE; | |
155 | int optval; | |
156 | socklen_t optlen = sizeof(optval); | |
157 | ||
158 | if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &optval, &optlen) < 0) | |
159 | { | |
160 | zlog_err("getsockopt of SO_SNDBUF failed %s\n", safe_strerror(errno)); | |
161 | return; | |
162 | } | |
163 | if (optval < size) | |
164 | { | |
165 | if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size)) < 0) | |
166 | { | |
167 | zlog_err("Couldn't increase send buffer: %s\n", safe_strerror(errno)); | |
168 | } | |
169 | } | |
170 | } | |
171 | ||
e5cc509c | 172 | int |
ef0b0c3e DL |
173 | bgp_set_socket_ttl (struct peer *peer, int bgp_sock) |
174 | { | |
5d804b43 | 175 | char buf[INET_ADDRSTRLEN]; |
1ff9a340 | 176 | int ret = 0; |
5d804b43 PM |
177 | |
178 | /* In case of peer is EBGP, we should set TTL for this connection. */ | |
179 | if (!peer->gtsm_hops && (peer_sort (peer) == BGP_PEER_EBGP)) | |
180 | { | |
181 | ret = sockopt_ttl (peer->su.sa.sa_family, bgp_sock, peer->ttl); | |
182 | if (ret) | |
183 | { | |
184 | zlog_err ("%s: Can't set TxTTL on peer (rtrid %s) socket, err = %d", | |
185 | __func__, | |
186 | inet_ntop (AF_INET, &peer->remote_id, buf, sizeof(buf)), | |
187 | errno); | |
e5cc509c | 188 | return ret; |
5d804b43 PM |
189 | } |
190 | } | |
191 | else if (peer->gtsm_hops) | |
192 | { | |
193 | /* On Linux, setting minttl without setting ttl seems to mess with the | |
194 | outgoing ttl. Therefore setting both. | |
195 | */ | |
196 | ret = sockopt_ttl (peer->su.sa.sa_family, bgp_sock, MAXTTL); | |
197 | if (ret) | |
198 | { | |
199 | zlog_err ("%s: Can't set TxTTL on peer (rtrid %s) socket, err = %d", | |
200 | __func__, | |
201 | inet_ntop (AF_INET, &peer->remote_id, buf, sizeof(buf)), | |
202 | errno); | |
e5cc509c | 203 | return ret; |
5d804b43 PM |
204 | } |
205 | ret = sockopt_minttl (peer->su.sa.sa_family, bgp_sock, | |
206 | MAXTTL + 1 - peer->gtsm_hops); | |
207 | if (ret) | |
208 | { | |
209 | zlog_err ("%s: Can't set MinTTL on peer (rtrid %s) socket, err = %d", | |
210 | __func__, | |
211 | inet_ntop (AF_INET, &peer->remote_id, buf, sizeof(buf)), | |
212 | errno); | |
e5cc509c | 213 | return ret; |
5d804b43 PM |
214 | } |
215 | } | |
e5cc509c DS |
216 | |
217 | return ret; | |
ef0b0c3e DL |
218 | } |
219 | ||
8dee0396 | 220 | /* |
221 | * Obtain the BGP instance that the incoming connection should be processed | |
222 | * against. This is important because more than one VRF could be using the | |
223 | * same IP address space. The instance is got by obtaining the device to | |
224 | * which the incoming connection is bound to. This could either be a VRF | |
225 | * or it could be an interface, which in turn determines the VRF. | |
226 | */ | |
227 | static int | |
228 | bgp_get_instance_for_inc_conn (int sock, struct bgp **bgp_inst) | |
229 | { | |
230 | char name[VRF_NAMSIZ + 1]; | |
231 | socklen_t name_len = VRF_NAMSIZ; | |
232 | struct bgp *bgp; | |
233 | int rc; | |
234 | struct listnode *node, *nnode; | |
235 | ||
236 | *bgp_inst = NULL; | |
237 | name[0] = '\0'; | |
238 | rc = getsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, name, &name_len); | |
239 | if (rc != 0) | |
240 | { | |
241 | zlog_err ("[Error] BGP SO_BINDTODEVICE get failed (%s), sock %d", | |
242 | safe_strerror (errno), sock); | |
243 | return -1; | |
244 | } | |
245 | ||
246 | if (!strlen(name)) | |
247 | return 0; /* default instance. */ | |
248 | ||
249 | /* First try match to instance; if that fails, check for interfaces. */ | |
250 | bgp = bgp_lookup_by_name (name); | |
251 | if (bgp) | |
252 | { | |
253 | if (!bgp->vrf_id) // unexpected | |
254 | return -1; | |
255 | *bgp_inst = bgp; | |
256 | return 0; | |
257 | } | |
258 | ||
259 | /* TODO - This will be optimized once interfaces move into the NS */ | |
260 | for (ALL_LIST_ELEMENTS (bm->bgp, node, nnode, bgp)) | |
261 | { | |
262 | struct interface *ifp; | |
263 | ||
264 | if (bgp->inst_type == BGP_INSTANCE_TYPE_VIEW) | |
265 | continue; | |
266 | ||
267 | ifp = if_lookup_by_name_vrf (name, bgp->vrf_id); | |
268 | if (ifp) | |
269 | { | |
270 | *bgp_inst = bgp; | |
271 | return 0; | |
272 | } | |
273 | } | |
274 | ||
275 | /* We didn't match to either an instance or an interface. */ | |
276 | return -1; | |
277 | } | |
278 | ||
718e3744 | 279 | /* Accept bgp connection. */ |
280 | static int | |
281 | bgp_accept (struct thread *thread) | |
282 | { | |
283 | int bgp_sock; | |
284 | int accept_sock; | |
285 | union sockunion su; | |
5bd58818 | 286 | struct bgp_listener *listener = THREAD_ARG(thread); |
718e3744 | 287 | struct peer *peer; |
eb821189 | 288 | struct peer *peer1; |
718e3744 | 289 | char buf[SU_ADDRSTRLEN]; |
8dee0396 | 290 | struct bgp *bgp = NULL; |
718e3744 | 291 | |
dd793e4a DW |
292 | sockunion_init (&su); |
293 | ||
5bd58818 | 294 | /* Register accept thread. */ |
718e3744 | 295 | accept_sock = THREAD_FD (thread); |
718e3744 | 296 | if (accept_sock < 0) |
297 | { | |
298 | zlog_err ("accept_sock is nevative value %d", accept_sock); | |
299 | return -1; | |
300 | } | |
9229d914 | 301 | listener->thread = thread_add_read (bm->master, bgp_accept, listener, accept_sock); |
718e3744 | 302 | |
303 | /* Accept client connection. */ | |
304 | bgp_sock = sockunion_accept (accept_sock, &su); | |
305 | if (bgp_sock < 0) | |
306 | { | |
6099b3b5 | 307 | zlog_err ("[Error] BGP socket accept failed (%s)", safe_strerror (errno)); |
718e3744 | 308 | return -1; |
309 | } | |
35398589 | 310 | set_nonblocking (bgp_sock); |
718e3744 | 311 | |
8dee0396 | 312 | /* Obtain BGP instance this connection is meant for. */ |
313 | if (bgp_get_instance_for_inc_conn (bgp_sock, &bgp)) | |
6aeb9e78 | 314 | { |
8dee0396 | 315 | zlog_err ("[Error] Could not get instance for incoming conn from %s", |
316 | inet_sutop (&su, buf)); | |
317 | close (bgp_sock); | |
6aeb9e78 DS |
318 | return -1; |
319 | } | |
6aeb9e78 | 320 | |
3374bef0 VK |
321 | /* Set socket send buffer size */ |
322 | bgp_update_sock_send_buffer_size(bgp_sock); | |
323 | ||
718e3744 | 324 | /* Check remote IP address */ |
6aeb9e78 | 325 | peer1 = peer_lookup (bgp, &su); |
f14e6fdb DS |
326 | |
327 | if (! peer1) | |
328 | { | |
6aeb9e78 | 329 | peer1 = peer_lookup_dynamic_neighbor (bgp, &su); |
f14e6fdb DS |
330 | if (peer1) |
331 | { | |
332 | /* Dynamic neighbor has been created, let it proceed */ | |
333 | peer1->fd = bgp_sock; | |
334 | bgp_fsm_change_status(peer1, Active); | |
335 | BGP_TIMER_OFF(peer1->t_start); /* created in peer_create() */ | |
336 | ||
337 | if (peer_active (peer1)) | |
338 | BGP_EVENT_ADD (peer1, TCP_connection_open); | |
339 | ||
340 | return 0; | |
341 | } | |
342 | } | |
343 | ||
1ff9a340 | 344 | if (! peer1) |
718e3744 | 345 | { |
167d390a | 346 | if (bgp_debug_neighbor_events(NULL)) |
718e3744 | 347 | { |
f14e6fdb DS |
348 | zlog_debug ("[Event] %s connection rejected - not configured" |
349 | " and not valid for dynamic", | |
1ff9a340 | 350 | inet_sutop (&su, buf)); |
718e3744 | 351 | } |
352 | close (bgp_sock); | |
353 | return -1; | |
354 | } | |
355 | ||
1ff9a340 DS |
356 | if (CHECK_FLAG(peer1->flags, PEER_FLAG_SHUTDOWN)) |
357 | { | |
167d390a | 358 | if (bgp_debug_neighbor_events(peer1)) |
16286195 DS |
359 | zlog_debug ("[Event] connection from %s rejected due to admin shutdown", |
360 | inet_sutop (&su, buf)); | |
1ff9a340 DS |
361 | close (bgp_sock); |
362 | return -1; | |
363 | } | |
364 | ||
365 | /* | |
366 | * Do not accept incoming connections in Clearing state. This can result | |
367 | * in incorect state transitions - e.g., the connection goes back to | |
368 | * Established and then the Clearing_Completed event is generated. Also, | |
369 | * block incoming connection in Deleted state. | |
370 | */ | |
371 | if (peer1->status == Clearing || peer1->status == Deleted) | |
372 | { | |
16286195 | 373 | if (bgp_debug_neighbor_events(peer1)) |
ffd0c037 | 374 | zlog_debug("[Event] Closing incoming conn for %s (%p) state %d", |
1ff9a340 DS |
375 | peer1->host, peer1, peer1->status); |
376 | close (bgp_sock); | |
377 | return -1; | |
378 | } | |
379 | ||
2672319b DS |
380 | /* Check that at least one AF is activated for the peer. */ |
381 | if (!peer_active (peer1)) | |
382 | { | |
383 | if (bgp_debug_neighbor_events(peer1)) | |
384 | zlog_debug ("%s - incoming conn rejected - no AF activated for peer", | |
385 | peer1->host); | |
386 | close (bgp_sock); | |
387 | return -1; | |
388 | } | |
389 | ||
16286195 | 390 | if (bgp_debug_neighbor_events(peer1)) |
5b6dc0dd DS |
391 | zlog_debug ("[Event] BGP connection from host %s fd %d", |
392 | inet_sutop (&su, buf), bgp_sock); | |
16286195 | 393 | |
1ff9a340 DS |
394 | if (peer1->doppelganger) |
395 | { | |
396 | /* We have an existing connection. Kill the existing one and run | |
397 | with this one. | |
398 | */ | |
167d390a | 399 | if (bgp_debug_neighbor_events(peer1)) |
1ff9a340 DS |
400 | zlog_debug ("[Event] New active connection from peer %s, Killing" |
401 | " previous active connection", peer1->host); | |
402 | peer_delete(peer1->doppelganger); | |
403 | } | |
404 | ||
e5cc509c DS |
405 | if (bgp_set_socket_ttl (peer1, bgp_sock) < 0) |
406 | if (bgp_debug_neighbor_events(peer1)) | |
407 | zlog_debug ("[Event] Unable to set min/max TTL on peer %s, Continuing", | |
408 | peer1->host); | |
718e3744 | 409 | |
a80beece | 410 | peer = peer_create (&su, peer1->conf_if, peer1->bgp, peer1->local_as, |
0299c004 | 411 | peer1->as, peer1->as_type, 0, 0); |
83260f00 | 412 | peer->su = su; |
eb821189 | 413 | |
1ff9a340 DS |
414 | peer_xfer_config(peer, peer1); |
415 | UNSET_FLAG (peer->flags, PEER_FLAG_CONFIG_NODE); | |
eb821189 | 416 | |
1ff9a340 DS |
417 | peer->doppelganger = peer1; |
418 | peer1->doppelganger = peer; | |
419 | peer->fd = bgp_sock; | |
f2345335 | 420 | bgp_bind(peer); |
1ff9a340 DS |
421 | bgp_fsm_change_status(peer, Active); |
422 | BGP_TIMER_OFF(peer->t_start); /* created in peer_create() */ | |
718e3744 | 423 | |
1ff9a340 | 424 | SET_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER); |
718e3744 | 425 | |
1ff9a340 DS |
426 | /* Make dummy peer until read Open packet. */ |
427 | if (peer1->status == Established && | |
428 | CHECK_FLAG (peer1->sflags, PEER_STATUS_NSF_MODE)) | |
429 | { | |
430 | /* If we have an existing established connection with graceful restart | |
431 | * capability announced with one or more address families, then drop | |
432 | * existing established connection and move state to connect. | |
433 | */ | |
434 | peer1->last_reset = PEER_DOWN_NSF_CLOSE_SESSION; | |
435 | SET_FLAG (peer1->sflags, PEER_STATUS_NSF_WAIT); | |
436 | bgp_event_update(peer1, TCP_connection_closed); | |
437 | } | |
438 | ||
439 | if (peer_active (peer)) | |
440 | { | |
441 | BGP_EVENT_ADD (peer, TCP_connection_open); | |
442 | } | |
718e3744 | 443 | |
444 | return 0; | |
445 | } | |
446 | ||
447 | /* BGP socket bind. */ | |
94f2b392 | 448 | static int |
718e3744 | 449 | bgp_bind (struct peer *peer) |
450 | { | |
451 | #ifdef SO_BINDTODEVICE | |
452 | int ret; | |
8dee0396 | 453 | char *name = NULL; |
718e3744 | 454 | |
8dee0396 | 455 | /* If not bound to an interface or part of a VRF, we don't care. */ |
6aeb9e78 | 456 | if (!peer->bgp->vrf_id && ! peer->ifname && !peer->conf_if) |
718e3744 | 457 | return 0; |
458 | ||
8dee0396 | 459 | if (peer->su.sa.sa_family != AF_INET && |
460 | peer->su.sa.sa_family != AF_INET6) | |
461 | return 0; // unexpected | |
462 | ||
463 | /* For IPv6 peering, interface (unnumbered or link-local with interface) | |
464 | * takes precedence over VRF. For IPv4 peering, explicit interface or | |
465 | * VRF are the situations to bind. | |
466 | */ | |
467 | if (peer->su.sa.sa_family == AF_INET6) | |
468 | name = (peer->conf_if ? peer->conf_if : \ | |
469 | (peer->ifname ? peer->ifname : peer->bgp->name)); | |
470 | else | |
471 | name = peer->ifname ? peer->ifname : peer->bgp->name; | |
472 | ||
473 | if (!name) | |
474 | return 0; | |
6aeb9e78 | 475 | |
d1e5048e DS |
476 | if (bgp_debug_neighbor_events(peer)) |
477 | zlog_debug ("%s Binding to interface %s", peer->host, name); | |
a80beece | 478 | |
98f5163c | 479 | if ( bgpd_privs.change (ZPRIVS_RAISE) ) |
480 | zlog_err ("bgp_bind: could not raise privs"); | |
481 | ||
f2345335 DS |
482 | ret = setsockopt (peer->fd, SOL_SOCKET, SO_BINDTODEVICE, |
483 | name, strlen(name)); | |
98f5163c | 484 | |
485 | if (bgpd_privs.change (ZPRIVS_LOWER) ) | |
486 | zlog_err ("bgp_bind: could not lower privs"); | |
487 | ||
718e3744 | 488 | if (ret < 0) |
489 | { | |
16286195 | 490 | zlog_info ("bind to interface %s failed", name); |
718e3744 | 491 | return ret; |
492 | } | |
493 | #endif /* SO_BINDTODEVICE */ | |
494 | return 0; | |
495 | } | |
496 | ||
1727d2e2 DL |
497 | static int |
498 | bgp_update_address (struct interface *ifp, const union sockunion *dst, | |
499 | union sockunion *addr) | |
718e3744 | 500 | { |
1727d2e2 | 501 | struct prefix *p, *sel, *d; |
718e3744 | 502 | struct connected *connected; |
52dc7ee6 | 503 | struct listnode *node; |
1727d2e2 DL |
504 | int common; |
505 | ||
506 | d = sockunion2hostprefix (dst); | |
507 | sel = NULL; | |
508 | common = -1; | |
718e3744 | 509 | |
1eb8ef25 | 510 | for (ALL_LIST_ELEMENTS_RO (ifp->connected, node, connected)) |
718e3744 | 511 | { |
1727d2e2 DL |
512 | p = connected->address; |
513 | if (p->family != d->family) | |
514 | continue; | |
515 | if (prefix_common_bits (p, d) > common) | |
516 | { | |
517 | sel = p; | |
518 | common = prefix_common_bits (sel, d); | |
519 | } | |
718e3744 | 520 | } |
1727d2e2 DL |
521 | |
522 | prefix_free (d); | |
523 | if (!sel) | |
524 | return 1; | |
525 | ||
526 | prefix2sockunion (sel, addr); | |
527 | return 0; | |
718e3744 | 528 | } |
529 | ||
530 | /* Update source selection. */ | |
49067496 | 531 | static int |
718e3744 | 532 | bgp_update_source (struct peer *peer) |
533 | { | |
534 | struct interface *ifp; | |
1727d2e2 | 535 | union sockunion addr; |
49067496 | 536 | int ret = 0; |
718e3744 | 537 | |
dd793e4a DW |
538 | sockunion_init (&addr); |
539 | ||
718e3744 | 540 | /* Source is specified with interface name. */ |
541 | if (peer->update_if) | |
542 | { | |
8dee0396 | 543 | ifp = if_lookup_by_name_vrf (peer->update_if, peer->bgp->vrf_id); |
718e3744 | 544 | if (! ifp) |
49067496 | 545 | return -1; |
718e3744 | 546 | |
1727d2e2 | 547 | if (bgp_update_address (ifp, &peer->su, &addr)) |
49067496 | 548 | return -1; |
718e3744 | 549 | |
49067496 | 550 | ret = sockunion_bind (peer->fd, &addr, 0, &addr); |
718e3744 | 551 | } |
552 | ||
553 | /* Source is specified with IP address. */ | |
554 | if (peer->update_source) | |
49067496 DS |
555 | ret = sockunion_bind (peer->fd, peer->update_source, 0, peer->update_source); |
556 | ||
557 | return ret; | |
718e3744 | 558 | } |
559 | ||
ed40466a DS |
560 | #define DATAPLANE_MARK 254 /* main table ID */ |
561 | ||
718e3744 | 562 | /* BGP try to connect to the peer. */ |
563 | int | |
564 | bgp_connect (struct peer *peer) | |
565 | { | |
566 | unsigned int ifindex = 0; | |
567 | ||
a80beece DS |
568 | if (peer->conf_if && BGP_PEER_SU_UNSPEC(peer)) |
569 | { | |
570 | zlog_debug("Peer address not learnt: Returning from connect"); | |
571 | return 0; | |
572 | } | |
718e3744 | 573 | /* Make socket for the peer. */ |
eb821189 | 574 | peer->fd = sockunion_socket (&peer->su); |
575 | if (peer->fd < 0) | |
718e3744 | 576 | return -1; |
577 | ||
48fc05fb VK |
578 | set_nonblocking (peer->fd); |
579 | ||
3374bef0 VK |
580 | /* Set socket send buffer size */ |
581 | bgp_update_sock_send_buffer_size(peer->fd); | |
582 | ||
e5cc509c DS |
583 | if (bgp_set_socket_ttl (peer, peer->fd) < 0) |
584 | return -1; | |
718e3744 | 585 | |
eb821189 | 586 | sockopt_reuseaddr (peer->fd); |
587 | sockopt_reuseport (peer->fd); | |
ed40466a DS |
588 | if (sockopt_mark_default(peer->fd, DATAPLANE_MARK, &bgpd_privs) < 0) |
589 | zlog_warn("Unable to set mark on FD for peer %s, err=%s", peer->host, | |
590 | safe_strerror(errno)); | |
0df7c91f | 591 | |
1423c809 | 592 | #ifdef IPTOS_PREC_INTERNETCONTROL |
5c88f19d CL |
593 | if (bgpd_privs.change (ZPRIVS_RAISE)) |
594 | zlog_err ("%s: could not raise privs", __func__); | |
1423c809 SH |
595 | if (sockunion_family (&peer->su) == AF_INET) |
596 | setsockopt_ipv4_tos (peer->fd, IPTOS_PREC_INTERNETCONTROL); | |
6d0732c8 SH |
597 | # ifdef HAVE_IPV6 |
598 | else if (sockunion_family (&peer->su) == AF_INET6) | |
599 | setsockopt_ipv6_tclass (peer->fd, IPTOS_PREC_INTERNETCONTROL); | |
600 | # endif | |
5c88f19d CL |
601 | if (bgpd_privs.change (ZPRIVS_LOWER)) |
602 | zlog_err ("%s: could not lower privs", __func__); | |
1423c809 SH |
603 | #endif |
604 | ||
0df7c91f PJ |
605 | if (peer->password) |
606 | bgp_md5_set_connect (peer->fd, &peer->su, peer->password); | |
718e3744 | 607 | |
608 | /* Bind socket. */ | |
609 | bgp_bind (peer); | |
610 | ||
611 | /* Update source bind. */ | |
49067496 DS |
612 | if (bgp_update_source (peer) < 0) |
613 | { | |
614 | return connect_error; | |
615 | } | |
718e3744 | 616 | |
617 | #ifdef HAVE_IPV6 | |
a80beece DS |
618 | if (peer->conf_if || peer->ifname) |
619 | ifindex = if_nametoindex (peer->conf_if ? peer->conf_if : peer->ifname); | |
718e3744 | 620 | #endif /* HAVE_IPV6 */ |
621 | ||
16286195 DS |
622 | if (bgp_debug_neighbor_events(peer)) |
623 | zlog_debug ("%s [Event] Connect start to %s fd %d", | |
624 | peer->host, peer->host, peer->fd); | |
718e3744 | 625 | |
626 | /* Connect to the remote peer. */ | |
eb821189 | 627 | return sockunion_connect (peer->fd, &peer->su, htons (peer->port), ifindex); |
718e3744 | 628 | } |
629 | ||
630 | /* After TCP connection is established. Get local address and port. */ | |
1ff9a340 | 631 | int |
718e3744 | 632 | bgp_getsockname (struct peer *peer) |
633 | { | |
634 | if (peer->su_local) | |
635 | { | |
22db9dec | 636 | sockunion_free (peer->su_local); |
718e3744 | 637 | peer->su_local = NULL; |
638 | } | |
639 | ||
640 | if (peer->su_remote) | |
641 | { | |
22db9dec | 642 | sockunion_free (peer->su_remote); |
718e3744 | 643 | peer->su_remote = NULL; |
644 | } | |
645 | ||
eb821189 | 646 | peer->su_local = sockunion_getsockname (peer->fd); |
1ff9a340 | 647 | if (!peer->su_local) return -1; |
eb821189 | 648 | peer->su_remote = sockunion_getpeername (peer->fd); |
1ff9a340 | 649 | if (!peer->su_remote) return -1; |
718e3744 | 650 | |
e33a4880 | 651 | if (bgp_nexthop_set (peer->su_local, peer->su_remote, |
652 | &peer->nexthop, peer)) | |
653 | { | |
654 | zlog_err ("%s: nexthop_set failed, resetting connection - intf %p", | |
655 | peer->host, peer->nexthop.ifp); | |
656 | return -1; | |
657 | } | |
1ff9a340 DS |
658 | |
659 | return 0; | |
718e3744 | 660 | } |
661 | ||
d023aec4 SH |
662 | |
663 | static int | |
664 | bgp_listener (int sock, struct sockaddr *sa, socklen_t salen) | |
665 | { | |
666 | struct bgp_listener *listener; | |
667 | int ret, en; | |
668 | ||
669 | sockopt_reuseaddr (sock); | |
670 | sockopt_reuseport (sock); | |
671 | ||
5c88f19d CL |
672 | if (bgpd_privs.change (ZPRIVS_RAISE)) |
673 | zlog_err ("%s: could not raise privs", __func__); | |
674 | ||
d023aec4 SH |
675 | #ifdef IPTOS_PREC_INTERNETCONTROL |
676 | if (sa->sa_family == AF_INET) | |
677 | setsockopt_ipv4_tos (sock, IPTOS_PREC_INTERNETCONTROL); | |
6d0732c8 SH |
678 | # ifdef HAVE_IPV6 |
679 | else if (sa->sa_family == AF_INET6) | |
680 | setsockopt_ipv6_tclass (sock, IPTOS_PREC_INTERNETCONTROL); | |
681 | # endif | |
d023aec4 SH |
682 | #endif |
683 | ||
ca051269 | 684 | sockopt_v6only (sa->sa_family, sock); |
d023aec4 | 685 | |
d023aec4 SH |
686 | ret = bind (sock, sa, salen); |
687 | en = errno; | |
5c88f19d CL |
688 | if (bgpd_privs.change (ZPRIVS_LOWER)) |
689 | zlog_err ("%s: could not lower privs", __func__); | |
d023aec4 SH |
690 | |
691 | if (ret < 0) | |
692 | { | |
693 | zlog_err ("bind: %s", safe_strerror (en)); | |
694 | return ret; | |
695 | } | |
696 | ||
697 | ret = listen (sock, 3); | |
698 | if (ret < 0) | |
699 | { | |
700 | zlog_err ("listen: %s", safe_strerror (errno)); | |
701 | return ret; | |
702 | } | |
703 | ||
704 | listener = XMALLOC (MTYPE_BGP_LISTENER, sizeof(*listener)); | |
705 | listener->fd = sock; | |
706 | memcpy(&listener->su, sa, salen); | |
9229d914 | 707 | listener->thread = thread_add_read (bm->master, bgp_accept, listener, sock); |
d023aec4 SH |
708 | listnode_add (bm->listen_sockets, listener); |
709 | ||
710 | return 0; | |
711 | } | |
712 | ||
718e3744 | 713 | /* IPv6 supported version of BGP server socket setup. */ |
714 | #if defined (HAVE_IPV6) && ! defined (NRL) | |
715 | int | |
d023aec4 | 716 | bgp_socket (unsigned short port, const char *address) |
718e3744 | 717 | { |
718e3744 | 718 | struct addrinfo *ainfo; |
719 | struct addrinfo *ainfo_save; | |
d023aec4 SH |
720 | static const struct addrinfo req = { |
721 | .ai_family = AF_UNSPEC, | |
722 | .ai_flags = AI_PASSIVE, | |
723 | .ai_socktype = SOCK_STREAM, | |
724 | }; | |
725 | int ret, count; | |
718e3744 | 726 | char port_str[BUFSIZ]; |
727 | ||
90b68769 | 728 | snprintf (port_str, sizeof(port_str), "%d", port); |
718e3744 | 729 | port_str[sizeof (port_str) - 1] = '\0'; |
730 | ||
d023aec4 | 731 | ret = getaddrinfo (address, port_str, &req, &ainfo_save); |
718e3744 | 732 | if (ret != 0) |
733 | { | |
734 | zlog_err ("getaddrinfo: %s", gai_strerror (ret)); | |
735 | return -1; | |
736 | } | |
737 | ||
d023aec4 SH |
738 | count = 0; |
739 | for (ainfo = ainfo_save; ainfo; ainfo = ainfo->ai_next) | |
718e3744 | 740 | { |
d023aec4 SH |
741 | int sock; |
742 | ||
718e3744 | 743 | if (ainfo->ai_family != AF_INET && ainfo->ai_family != AF_INET6) |
744 | continue; | |
745 | ||
746 | sock = socket (ainfo->ai_family, ainfo->ai_socktype, ainfo->ai_protocol); | |
747 | if (sock < 0) | |
748 | { | |
6099b3b5 | 749 | zlog_err ("socket: %s", safe_strerror (errno)); |
718e3744 | 750 | continue; |
751 | } | |
fa411a21 NH |
752 | |
753 | /* if we intend to implement ttl-security, this socket needs ttl=255 */ | |
754 | sockopt_ttl (ainfo->ai_family, sock, MAXTTL); | |
755 | ||
d023aec4 SH |
756 | ret = bgp_listener (sock, ainfo->ai_addr, ainfo->ai_addrlen); |
757 | if (ret == 0) | |
758 | ++count; | |
759 | else | |
760 | close(sock); | |
718e3744 | 761 | } |
718e3744 | 762 | freeaddrinfo (ainfo_save); |
d023aec4 SH |
763 | if (count == 0) |
764 | { | |
765 | zlog_err ("%s: no usable addresses", __func__); | |
766 | return -1; | |
767 | } | |
718e3744 | 768 | |
d023aec4 | 769 | return 0; |
718e3744 | 770 | } |
771 | #else | |
772 | /* Traditional IPv4 only version. */ | |
773 | int | |
d023aec4 | 774 | bgp_socket (unsigned short port, const char *address) |
718e3744 | 775 | { |
776 | int sock; | |
777 | int socklen; | |
778 | struct sockaddr_in sin; | |
4a1a2716 | 779 | int ret, en; |
718e3744 | 780 | |
781 | sock = socket (AF_INET, SOCK_STREAM, 0); | |
782 | if (sock < 0) | |
783 | { | |
6099b3b5 | 784 | zlog_err ("socket: %s", safe_strerror (errno)); |
718e3744 | 785 | return sock; |
786 | } | |
787 | ||
fa411a21 NH |
788 | /* if we intend to implement ttl-security, this socket needs ttl=255 */ |
789 | sockopt_ttl (AF_INET, sock, MAXTTL); | |
790 | ||
718e3744 | 791 | memset (&sin, 0, sizeof (struct sockaddr_in)); |
718e3744 | 792 | sin.sin_family = AF_INET; |
793 | sin.sin_port = htons (port); | |
794 | socklen = sizeof (struct sockaddr_in); | |
3a02d1f7 | 795 | |
90b68769 | 796 | if (address && ((ret = inet_aton(address, &sin.sin_addr)) < 1)) |
3a02d1f7 | 797 | { |
90b68769 PJ |
798 | zlog_err("bgp_socket: could not parse ip address %s: %s", |
799 | address, safe_strerror (errno)); | |
3a02d1f7 PJ |
800 | return ret; |
801 | } | |
6f0e3f6e | 802 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
718e3744 | 803 | sin.sin_len = socklen; |
6f0e3f6e | 804 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
718e3744 | 805 | |
d023aec4 | 806 | ret = bgp_listener (sock, (struct sockaddr *) &sin, socklen); |
718e3744 | 807 | if (ret < 0) |
808 | { | |
718e3744 | 809 | close (sock); |
810 | return ret; | |
811 | } | |
718e3744 | 812 | return sock; |
813 | } | |
814 | #endif /* HAVE_IPV6 && !NRL */ | |
d023aec4 SH |
815 | |
816 | void | |
817 | bgp_close (void) | |
818 | { | |
819 | struct listnode *node, *next; | |
820 | struct bgp_listener *listener; | |
821 | ||
1ff9a340 DS |
822 | if (bm->listen_sockets == NULL) |
823 | return; | |
824 | ||
d023aec4 SH |
825 | for (ALL_LIST_ELEMENTS (bm->listen_sockets, node, next, listener)) |
826 | { | |
827 | thread_cancel (listener->thread); | |
828 | close (listener->fd); | |
829 | listnode_delete (bm->listen_sockets, listener); | |
830 | XFREE (MTYPE_BGP_LISTENER, listener); | |
831 | } | |
832 | } |