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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; | |
64 | ||
65 | assert (socket >= 0); | |
66 | ||
67 | #if HAVE_DECL_TCP_MD5SIG | |
68 | ret = sockopt_tcp_signature (socket, su, password); | |
69 | en = errno; | |
70 | #endif /* HAVE_TCP_MD5SIG */ | |
71 | ||
72 | if (ret < 0) | |
16286195 | 73 | zlog_warn ("can't set TCP_MD5SIG option on socket %d: %s", socket, safe_strerror (en)); |
0df7c91f PJ |
74 | |
75 | return ret; | |
76 | } | |
77 | ||
78 | /* Helper for bgp_connect */ | |
79 | static int | |
80 | bgp_md5_set_connect (int socket, union sockunion *su, const char *password) | |
81 | { | |
82 | int ret = -1; | |
83 | ||
84 | #if HAVE_DECL_TCP_MD5SIG | |
85 | if ( bgpd_privs.change (ZPRIVS_RAISE) ) | |
86 | { | |
87 | zlog_err ("%s: could not raise privs", __func__); | |
88 | return ret; | |
89 | } | |
90 | ||
91 | ret = bgp_md5_set_socket (socket, su, password); | |
92 | ||
93 | if (bgpd_privs.change (ZPRIVS_LOWER) ) | |
94 | zlog_err ("%s: could not lower privs", __func__); | |
95 | #endif /* HAVE_TCP_MD5SIG */ | |
96 | ||
97 | return ret; | |
98 | } | |
99 | ||
100 | int | |
101 | bgp_md5_set (struct peer *peer) | |
102 | { | |
103 | struct listnode *node; | |
d1c21cab SH |
104 | int ret = 0; |
105 | struct bgp_listener *listener; | |
0df7c91f PJ |
106 | |
107 | if ( bgpd_privs.change (ZPRIVS_RAISE) ) | |
108 | { | |
109 | zlog_err ("%s: could not raise privs", __func__); | |
110 | return -1; | |
111 | } | |
112 | ||
113 | /* Just set the password on the listen socket(s). Outbound connections | |
114 | * are taken care of in bgp_connect() below. | |
115 | */ | |
d1c21cab SH |
116 | for (ALL_LIST_ELEMENTS_RO(bm->listen_sockets, node, listener)) |
117 | if (listener->su.sa.sa_family == peer->su.sa.sa_family) | |
118 | { | |
119 | ret = bgp_md5_set_socket (listener->fd, &peer->su, peer->password); | |
120 | break; | |
121 | } | |
122 | ||
0df7c91f PJ |
123 | if (bgpd_privs.change (ZPRIVS_LOWER) ) |
124 | zlog_err ("%s: could not lower privs", __func__); | |
125 | ||
d1c21cab | 126 | return ret; |
0df7c91f | 127 | } |
3374bef0 VK |
128 | |
129 | /* Update BGP socket send buffer size */ | |
130 | static void | |
131 | bgp_update_sock_send_buffer_size (int fd) | |
132 | { | |
133 | int size = BGP_SOCKET_SNDBUF_SIZE; | |
134 | int optval; | |
135 | socklen_t optlen = sizeof(optval); | |
136 | ||
137 | if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &optval, &optlen) < 0) | |
138 | { | |
139 | zlog_err("getsockopt of SO_SNDBUF failed %s\n", safe_strerror(errno)); | |
140 | return; | |
141 | } | |
142 | if (optval < size) | |
143 | { | |
144 | if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size)) < 0) | |
145 | { | |
146 | zlog_err("Couldn't increase send buffer: %s\n", safe_strerror(errno)); | |
147 | } | |
148 | } | |
149 | } | |
150 | ||
ef0b0c3e DL |
151 | static void |
152 | bgp_set_socket_ttl (struct peer *peer, int bgp_sock) | |
153 | { | |
5d804b43 | 154 | char buf[INET_ADDRSTRLEN]; |
1ff9a340 | 155 | int ret = 0; |
5d804b43 PM |
156 | |
157 | /* In case of peer is EBGP, we should set TTL for this connection. */ | |
158 | if (!peer->gtsm_hops && (peer_sort (peer) == BGP_PEER_EBGP)) | |
159 | { | |
160 | ret = sockopt_ttl (peer->su.sa.sa_family, bgp_sock, peer->ttl); | |
161 | if (ret) | |
162 | { | |
163 | zlog_err ("%s: Can't set TxTTL on peer (rtrid %s) socket, err = %d", | |
164 | __func__, | |
165 | inet_ntop (AF_INET, &peer->remote_id, buf, sizeof(buf)), | |
166 | errno); | |
167 | } | |
168 | } | |
169 | else if (peer->gtsm_hops) | |
170 | { | |
171 | /* On Linux, setting minttl without setting ttl seems to mess with the | |
172 | outgoing ttl. Therefore setting both. | |
173 | */ | |
174 | ret = sockopt_ttl (peer->su.sa.sa_family, bgp_sock, MAXTTL); | |
175 | if (ret) | |
176 | { | |
177 | zlog_err ("%s: Can't set TxTTL on peer (rtrid %s) socket, err = %d", | |
178 | __func__, | |
179 | inet_ntop (AF_INET, &peer->remote_id, buf, sizeof(buf)), | |
180 | errno); | |
181 | } | |
182 | ret = sockopt_minttl (peer->su.sa.sa_family, bgp_sock, | |
183 | MAXTTL + 1 - peer->gtsm_hops); | |
184 | if (ret) | |
185 | { | |
186 | zlog_err ("%s: Can't set MinTTL on peer (rtrid %s) socket, err = %d", | |
187 | __func__, | |
188 | inet_ntop (AF_INET, &peer->remote_id, buf, sizeof(buf)), | |
189 | errno); | |
190 | } | |
191 | } | |
ef0b0c3e DL |
192 | } |
193 | ||
718e3744 | 194 | /* Accept bgp connection. */ |
195 | static int | |
196 | bgp_accept (struct thread *thread) | |
197 | { | |
198 | int bgp_sock; | |
199 | int accept_sock; | |
200 | union sockunion su; | |
5bd58818 | 201 | struct bgp_listener *listener = THREAD_ARG(thread); |
718e3744 | 202 | struct peer *peer; |
eb821189 | 203 | struct peer *peer1; |
718e3744 | 204 | char buf[SU_ADDRSTRLEN]; |
205 | ||
5bd58818 | 206 | /* Register accept thread. */ |
718e3744 | 207 | accept_sock = THREAD_FD (thread); |
718e3744 | 208 | if (accept_sock < 0) |
209 | { | |
210 | zlog_err ("accept_sock is nevative value %d", accept_sock); | |
211 | return -1; | |
212 | } | |
5bd58818 | 213 | listener->thread = thread_add_read (master, bgp_accept, listener, accept_sock); |
718e3744 | 214 | |
215 | /* Accept client connection. */ | |
216 | bgp_sock = sockunion_accept (accept_sock, &su); | |
217 | if (bgp_sock < 0) | |
218 | { | |
6099b3b5 | 219 | zlog_err ("[Error] BGP socket accept failed (%s)", safe_strerror (errno)); |
718e3744 | 220 | return -1; |
221 | } | |
35398589 | 222 | set_nonblocking (bgp_sock); |
718e3744 | 223 | |
3374bef0 VK |
224 | /* Set socket send buffer size */ |
225 | bgp_update_sock_send_buffer_size(bgp_sock); | |
226 | ||
718e3744 | 227 | /* Check remote IP address */ |
5bd58818 | 228 | peer1 = peer_lookup (NULL, &su); |
f14e6fdb DS |
229 | |
230 | if (! peer1) | |
231 | { | |
232 | peer1 = peer_lookup_dynamic_neighbor (NULL, &su); | |
233 | if (peer1) | |
234 | { | |
235 | /* Dynamic neighbor has been created, let it proceed */ | |
236 | peer1->fd = bgp_sock; | |
237 | bgp_fsm_change_status(peer1, Active); | |
238 | BGP_TIMER_OFF(peer1->t_start); /* created in peer_create() */ | |
239 | ||
240 | if (peer_active (peer1)) | |
241 | BGP_EVENT_ADD (peer1, TCP_connection_open); | |
242 | ||
243 | return 0; | |
244 | } | |
245 | } | |
246 | ||
1ff9a340 | 247 | if (! peer1) |
718e3744 | 248 | { |
167d390a | 249 | if (bgp_debug_neighbor_events(NULL)) |
718e3744 | 250 | { |
f14e6fdb DS |
251 | zlog_debug ("[Event] %s connection rejected - not configured" |
252 | " and not valid for dynamic", | |
1ff9a340 | 253 | inet_sutop (&su, buf)); |
718e3744 | 254 | } |
255 | close (bgp_sock); | |
256 | return -1; | |
257 | } | |
258 | ||
1ff9a340 DS |
259 | if (CHECK_FLAG(peer1->flags, PEER_FLAG_SHUTDOWN)) |
260 | { | |
167d390a | 261 | if (bgp_debug_neighbor_events(peer1)) |
16286195 DS |
262 | zlog_debug ("[Event] connection from %s rejected due to admin shutdown", |
263 | inet_sutop (&su, buf)); | |
1ff9a340 DS |
264 | close (bgp_sock); |
265 | return -1; | |
266 | } | |
267 | ||
268 | /* | |
269 | * Do not accept incoming connections in Clearing state. This can result | |
270 | * in incorect state transitions - e.g., the connection goes back to | |
271 | * Established and then the Clearing_Completed event is generated. Also, | |
272 | * block incoming connection in Deleted state. | |
273 | */ | |
274 | if (peer1->status == Clearing || peer1->status == Deleted) | |
275 | { | |
276 | struct bgp *bgp = peer1->bgp; | |
277 | ||
16286195 | 278 | if (bgp_debug_neighbor_events(peer1)) |
1ff9a340 DS |
279 | zlog_debug("[Event] Closing incoming conn for %s (0x%x) state %d", |
280 | peer1->host, peer1, peer1->status); | |
281 | close (bgp_sock); | |
282 | return -1; | |
283 | } | |
284 | ||
2672319b DS |
285 | /* Check that at least one AF is activated for the peer. */ |
286 | if (!peer_active (peer1)) | |
287 | { | |
288 | if (bgp_debug_neighbor_events(peer1)) | |
289 | zlog_debug ("%s - incoming conn rejected - no AF activated for peer", | |
290 | peer1->host); | |
291 | close (bgp_sock); | |
292 | return -1; | |
293 | } | |
294 | ||
16286195 | 295 | if (bgp_debug_neighbor_events(peer1)) |
5b6dc0dd DS |
296 | zlog_debug ("[Event] BGP connection from host %s fd %d", |
297 | inet_sutop (&su, buf), bgp_sock); | |
16286195 | 298 | |
1ff9a340 DS |
299 | if (peer1->doppelganger) |
300 | { | |
301 | /* We have an existing connection. Kill the existing one and run | |
302 | with this one. | |
303 | */ | |
167d390a | 304 | if (bgp_debug_neighbor_events(peer1)) |
1ff9a340 DS |
305 | zlog_debug ("[Event] New active connection from peer %s, Killing" |
306 | " previous active connection", peer1->host); | |
307 | peer_delete(peer1->doppelganger); | |
308 | } | |
309 | ||
ef0b0c3e | 310 | bgp_set_socket_ttl (peer1, bgp_sock); |
718e3744 | 311 | |
a80beece | 312 | peer = peer_create (&su, peer1->conf_if, peer1->bgp, peer1->local_as, |
0299c004 | 313 | peer1->as, peer1->as_type, 0, 0); |
eb821189 | 314 | |
1ff9a340 DS |
315 | peer_xfer_config(peer, peer1); |
316 | UNSET_FLAG (peer->flags, PEER_FLAG_CONFIG_NODE); | |
eb821189 | 317 | |
1ff9a340 DS |
318 | peer->doppelganger = peer1; |
319 | peer1->doppelganger = peer; | |
320 | peer->fd = bgp_sock; | |
f2345335 | 321 | bgp_bind(peer); |
1ff9a340 DS |
322 | bgp_fsm_change_status(peer, Active); |
323 | BGP_TIMER_OFF(peer->t_start); /* created in peer_create() */ | |
718e3744 | 324 | |
1ff9a340 | 325 | SET_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER); |
718e3744 | 326 | |
1ff9a340 DS |
327 | /* Make dummy peer until read Open packet. */ |
328 | if (peer1->status == Established && | |
329 | CHECK_FLAG (peer1->sflags, PEER_STATUS_NSF_MODE)) | |
330 | { | |
331 | /* If we have an existing established connection with graceful restart | |
332 | * capability announced with one or more address families, then drop | |
333 | * existing established connection and move state to connect. | |
334 | */ | |
335 | peer1->last_reset = PEER_DOWN_NSF_CLOSE_SESSION; | |
336 | SET_FLAG (peer1->sflags, PEER_STATUS_NSF_WAIT); | |
337 | bgp_event_update(peer1, TCP_connection_closed); | |
338 | } | |
339 | ||
340 | if (peer_active (peer)) | |
341 | { | |
342 | BGP_EVENT_ADD (peer, TCP_connection_open); | |
343 | } | |
718e3744 | 344 | |
345 | return 0; | |
346 | } | |
347 | ||
348 | /* BGP socket bind. */ | |
94f2b392 | 349 | static int |
718e3744 | 350 | bgp_bind (struct peer *peer) |
351 | { | |
352 | #ifdef SO_BINDTODEVICE | |
353 | int ret; | |
a80beece | 354 | char *name; |
718e3744 | 355 | |
a80beece | 356 | if (! peer->ifname && !peer->conf_if) |
718e3744 | 357 | return 0; |
358 | ||
a80beece DS |
359 | name = (peer->conf_if ? peer->conf_if : peer->ifname); |
360 | ||
98f5163c | 361 | if ( bgpd_privs.change (ZPRIVS_RAISE) ) |
362 | zlog_err ("bgp_bind: could not raise privs"); | |
363 | ||
f2345335 DS |
364 | ret = setsockopt (peer->fd, SOL_SOCKET, SO_BINDTODEVICE, |
365 | name, strlen(name)); | |
98f5163c | 366 | |
367 | if (bgpd_privs.change (ZPRIVS_LOWER) ) | |
368 | zlog_err ("bgp_bind: could not lower privs"); | |
369 | ||
718e3744 | 370 | if (ret < 0) |
371 | { | |
16286195 | 372 | zlog_info ("bind to interface %s failed", name); |
718e3744 | 373 | return ret; |
374 | } | |
375 | #endif /* SO_BINDTODEVICE */ | |
376 | return 0; | |
377 | } | |
378 | ||
1727d2e2 DL |
379 | static int |
380 | bgp_update_address (struct interface *ifp, const union sockunion *dst, | |
381 | union sockunion *addr) | |
718e3744 | 382 | { |
1727d2e2 | 383 | struct prefix *p, *sel, *d; |
718e3744 | 384 | struct connected *connected; |
52dc7ee6 | 385 | struct listnode *node; |
1727d2e2 DL |
386 | int common; |
387 | ||
388 | d = sockunion2hostprefix (dst); | |
389 | sel = NULL; | |
390 | common = -1; | |
718e3744 | 391 | |
1eb8ef25 | 392 | for (ALL_LIST_ELEMENTS_RO (ifp->connected, node, connected)) |
718e3744 | 393 | { |
1727d2e2 DL |
394 | p = connected->address; |
395 | if (p->family != d->family) | |
396 | continue; | |
397 | if (prefix_common_bits (p, d) > common) | |
398 | { | |
399 | sel = p; | |
400 | common = prefix_common_bits (sel, d); | |
401 | } | |
718e3744 | 402 | } |
1727d2e2 DL |
403 | |
404 | prefix_free (d); | |
405 | if (!sel) | |
406 | return 1; | |
407 | ||
408 | prefix2sockunion (sel, addr); | |
409 | return 0; | |
718e3744 | 410 | } |
411 | ||
412 | /* Update source selection. */ | |
94f2b392 | 413 | static void |
718e3744 | 414 | bgp_update_source (struct peer *peer) |
415 | { | |
416 | struct interface *ifp; | |
1727d2e2 | 417 | union sockunion addr; |
718e3744 | 418 | |
419 | /* Source is specified with interface name. */ | |
420 | if (peer->update_if) | |
421 | { | |
422 | ifp = if_lookup_by_name (peer->update_if); | |
423 | if (! ifp) | |
424 | return; | |
425 | ||
1727d2e2 | 426 | if (bgp_update_address (ifp, &peer->su, &addr)) |
718e3744 | 427 | return; |
428 | ||
1727d2e2 | 429 | sockunion_bind (peer->fd, &addr, 0, &addr); |
718e3744 | 430 | } |
431 | ||
432 | /* Source is specified with IP address. */ | |
433 | if (peer->update_source) | |
eb821189 | 434 | sockunion_bind (peer->fd, peer->update_source, 0, peer->update_source); |
718e3744 | 435 | } |
436 | ||
437 | /* BGP try to connect to the peer. */ | |
438 | int | |
439 | bgp_connect (struct peer *peer) | |
440 | { | |
441 | unsigned int ifindex = 0; | |
442 | ||
a80beece DS |
443 | if (peer->conf_if && BGP_PEER_SU_UNSPEC(peer)) |
444 | { | |
445 | zlog_debug("Peer address not learnt: Returning from connect"); | |
446 | return 0; | |
447 | } | |
718e3744 | 448 | /* Make socket for the peer. */ |
eb821189 | 449 | peer->fd = sockunion_socket (&peer->su); |
450 | if (peer->fd < 0) | |
718e3744 | 451 | return -1; |
452 | ||
48fc05fb VK |
453 | set_nonblocking (peer->fd); |
454 | ||
3374bef0 VK |
455 | /* Set socket send buffer size */ |
456 | bgp_update_sock_send_buffer_size(peer->fd); | |
457 | ||
ef0b0c3e | 458 | bgp_set_socket_ttl (peer, peer->fd); |
718e3744 | 459 | |
eb821189 | 460 | sockopt_reuseaddr (peer->fd); |
461 | sockopt_reuseport (peer->fd); | |
0df7c91f | 462 | |
1423c809 | 463 | #ifdef IPTOS_PREC_INTERNETCONTROL |
5c88f19d CL |
464 | if (bgpd_privs.change (ZPRIVS_RAISE)) |
465 | zlog_err ("%s: could not raise privs", __func__); | |
1423c809 SH |
466 | if (sockunion_family (&peer->su) == AF_INET) |
467 | setsockopt_ipv4_tos (peer->fd, IPTOS_PREC_INTERNETCONTROL); | |
6d0732c8 SH |
468 | # ifdef HAVE_IPV6 |
469 | else if (sockunion_family (&peer->su) == AF_INET6) | |
470 | setsockopt_ipv6_tclass (peer->fd, IPTOS_PREC_INTERNETCONTROL); | |
471 | # endif | |
5c88f19d CL |
472 | if (bgpd_privs.change (ZPRIVS_LOWER)) |
473 | zlog_err ("%s: could not lower privs", __func__); | |
1423c809 SH |
474 | #endif |
475 | ||
0df7c91f PJ |
476 | if (peer->password) |
477 | bgp_md5_set_connect (peer->fd, &peer->su, peer->password); | |
718e3744 | 478 | |
479 | /* Bind socket. */ | |
480 | bgp_bind (peer); | |
481 | ||
482 | /* Update source bind. */ | |
483 | bgp_update_source (peer); | |
484 | ||
485 | #ifdef HAVE_IPV6 | |
a80beece DS |
486 | if (peer->conf_if || peer->ifname) |
487 | ifindex = if_nametoindex (peer->conf_if ? peer->conf_if : peer->ifname); | |
718e3744 | 488 | #endif /* HAVE_IPV6 */ |
489 | ||
16286195 DS |
490 | if (bgp_debug_neighbor_events(peer)) |
491 | zlog_debug ("%s [Event] Connect start to %s fd %d", | |
492 | peer->host, peer->host, peer->fd); | |
718e3744 | 493 | |
494 | /* Connect to the remote peer. */ | |
eb821189 | 495 | return sockunion_connect (peer->fd, &peer->su, htons (peer->port), ifindex); |
718e3744 | 496 | } |
497 | ||
498 | /* After TCP connection is established. Get local address and port. */ | |
1ff9a340 | 499 | int |
718e3744 | 500 | bgp_getsockname (struct peer *peer) |
501 | { | |
502 | if (peer->su_local) | |
503 | { | |
22db9dec | 504 | sockunion_free (peer->su_local); |
718e3744 | 505 | peer->su_local = NULL; |
506 | } | |
507 | ||
508 | if (peer->su_remote) | |
509 | { | |
22db9dec | 510 | sockunion_free (peer->su_remote); |
718e3744 | 511 | peer->su_remote = NULL; |
512 | } | |
513 | ||
eb821189 | 514 | peer->su_local = sockunion_getsockname (peer->fd); |
1ff9a340 | 515 | if (!peer->su_local) return -1; |
eb821189 | 516 | peer->su_remote = sockunion_getpeername (peer->fd); |
1ff9a340 | 517 | if (!peer->su_remote) return -1; |
718e3744 | 518 | |
519 | bgp_nexthop_set (peer->su_local, peer->su_remote, &peer->nexthop, peer); | |
1ff9a340 DS |
520 | |
521 | return 0; | |
718e3744 | 522 | } |
523 | ||
d023aec4 SH |
524 | |
525 | static int | |
526 | bgp_listener (int sock, struct sockaddr *sa, socklen_t salen) | |
527 | { | |
528 | struct bgp_listener *listener; | |
529 | int ret, en; | |
530 | ||
531 | sockopt_reuseaddr (sock); | |
532 | sockopt_reuseport (sock); | |
533 | ||
5c88f19d CL |
534 | if (bgpd_privs.change (ZPRIVS_RAISE)) |
535 | zlog_err ("%s: could not raise privs", __func__); | |
536 | ||
d023aec4 SH |
537 | #ifdef IPTOS_PREC_INTERNETCONTROL |
538 | if (sa->sa_family == AF_INET) | |
539 | setsockopt_ipv4_tos (sock, IPTOS_PREC_INTERNETCONTROL); | |
6d0732c8 SH |
540 | # ifdef HAVE_IPV6 |
541 | else if (sa->sa_family == AF_INET6) | |
542 | setsockopt_ipv6_tclass (sock, IPTOS_PREC_INTERNETCONTROL); | |
543 | # endif | |
d023aec4 SH |
544 | #endif |
545 | ||
ca051269 | 546 | sockopt_v6only (sa->sa_family, sock); |
d023aec4 | 547 | |
d023aec4 SH |
548 | ret = bind (sock, sa, salen); |
549 | en = errno; | |
5c88f19d CL |
550 | if (bgpd_privs.change (ZPRIVS_LOWER)) |
551 | zlog_err ("%s: could not lower privs", __func__); | |
d023aec4 SH |
552 | |
553 | if (ret < 0) | |
554 | { | |
555 | zlog_err ("bind: %s", safe_strerror (en)); | |
556 | return ret; | |
557 | } | |
558 | ||
559 | ret = listen (sock, 3); | |
560 | if (ret < 0) | |
561 | { | |
562 | zlog_err ("listen: %s", safe_strerror (errno)); | |
563 | return ret; | |
564 | } | |
565 | ||
566 | listener = XMALLOC (MTYPE_BGP_LISTENER, sizeof(*listener)); | |
567 | listener->fd = sock; | |
568 | memcpy(&listener->su, sa, salen); | |
569 | listener->thread = thread_add_read (master, bgp_accept, listener, sock); | |
570 | listnode_add (bm->listen_sockets, listener); | |
571 | ||
572 | return 0; | |
573 | } | |
574 | ||
718e3744 | 575 | /* IPv6 supported version of BGP server socket setup. */ |
576 | #if defined (HAVE_IPV6) && ! defined (NRL) | |
577 | int | |
d023aec4 | 578 | bgp_socket (unsigned short port, const char *address) |
718e3744 | 579 | { |
718e3744 | 580 | struct addrinfo *ainfo; |
581 | struct addrinfo *ainfo_save; | |
d023aec4 SH |
582 | static const struct addrinfo req = { |
583 | .ai_family = AF_UNSPEC, | |
584 | .ai_flags = AI_PASSIVE, | |
585 | .ai_socktype = SOCK_STREAM, | |
586 | }; | |
587 | int ret, count; | |
718e3744 | 588 | char port_str[BUFSIZ]; |
589 | ||
90b68769 | 590 | snprintf (port_str, sizeof(port_str), "%d", port); |
718e3744 | 591 | port_str[sizeof (port_str) - 1] = '\0'; |
592 | ||
d023aec4 | 593 | ret = getaddrinfo (address, port_str, &req, &ainfo_save); |
718e3744 | 594 | if (ret != 0) |
595 | { | |
596 | zlog_err ("getaddrinfo: %s", gai_strerror (ret)); | |
597 | return -1; | |
598 | } | |
599 | ||
d023aec4 SH |
600 | count = 0; |
601 | for (ainfo = ainfo_save; ainfo; ainfo = ainfo->ai_next) | |
718e3744 | 602 | { |
d023aec4 SH |
603 | int sock; |
604 | ||
718e3744 | 605 | if (ainfo->ai_family != AF_INET && ainfo->ai_family != AF_INET6) |
606 | continue; | |
607 | ||
608 | sock = socket (ainfo->ai_family, ainfo->ai_socktype, ainfo->ai_protocol); | |
609 | if (sock < 0) | |
610 | { | |
6099b3b5 | 611 | zlog_err ("socket: %s", safe_strerror (errno)); |
718e3744 | 612 | continue; |
613 | } | |
fa411a21 NH |
614 | |
615 | /* if we intend to implement ttl-security, this socket needs ttl=255 */ | |
616 | sockopt_ttl (ainfo->ai_family, sock, MAXTTL); | |
617 | ||
d023aec4 SH |
618 | ret = bgp_listener (sock, ainfo->ai_addr, ainfo->ai_addrlen); |
619 | if (ret == 0) | |
620 | ++count; | |
621 | else | |
622 | close(sock); | |
718e3744 | 623 | } |
718e3744 | 624 | freeaddrinfo (ainfo_save); |
d023aec4 SH |
625 | if (count == 0) |
626 | { | |
627 | zlog_err ("%s: no usable addresses", __func__); | |
628 | return -1; | |
629 | } | |
718e3744 | 630 | |
d023aec4 | 631 | return 0; |
718e3744 | 632 | } |
633 | #else | |
634 | /* Traditional IPv4 only version. */ | |
635 | int | |
d023aec4 | 636 | bgp_socket (unsigned short port, const char *address) |
718e3744 | 637 | { |
638 | int sock; | |
639 | int socklen; | |
640 | struct sockaddr_in sin; | |
4a1a2716 | 641 | int ret, en; |
718e3744 | 642 | |
643 | sock = socket (AF_INET, SOCK_STREAM, 0); | |
644 | if (sock < 0) | |
645 | { | |
6099b3b5 | 646 | zlog_err ("socket: %s", safe_strerror (errno)); |
718e3744 | 647 | return sock; |
648 | } | |
649 | ||
fa411a21 NH |
650 | /* if we intend to implement ttl-security, this socket needs ttl=255 */ |
651 | sockopt_ttl (AF_INET, sock, MAXTTL); | |
652 | ||
718e3744 | 653 | memset (&sin, 0, sizeof (struct sockaddr_in)); |
718e3744 | 654 | sin.sin_family = AF_INET; |
655 | sin.sin_port = htons (port); | |
656 | socklen = sizeof (struct sockaddr_in); | |
3a02d1f7 | 657 | |
90b68769 | 658 | if (address && ((ret = inet_aton(address, &sin.sin_addr)) < 1)) |
3a02d1f7 | 659 | { |
90b68769 PJ |
660 | zlog_err("bgp_socket: could not parse ip address %s: %s", |
661 | address, safe_strerror (errno)); | |
3a02d1f7 PJ |
662 | return ret; |
663 | } | |
6f0e3f6e | 664 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
718e3744 | 665 | sin.sin_len = socklen; |
6f0e3f6e | 666 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
718e3744 | 667 | |
d023aec4 | 668 | ret = bgp_listener (sock, (struct sockaddr *) &sin, socklen); |
718e3744 | 669 | if (ret < 0) |
670 | { | |
718e3744 | 671 | close (sock); |
672 | return ret; | |
673 | } | |
718e3744 | 674 | return sock; |
675 | } | |
676 | #endif /* HAVE_IPV6 && !NRL */ | |
d023aec4 SH |
677 | |
678 | void | |
679 | bgp_close (void) | |
680 | { | |
681 | struct listnode *node, *next; | |
682 | struct bgp_listener *listener; | |
683 | ||
1ff9a340 DS |
684 | if (bm->listen_sockets == NULL) |
685 | return; | |
686 | ||
d023aec4 SH |
687 | for (ALL_LIST_ELEMENTS (bm->listen_sockets, node, next, listener)) |
688 | { | |
689 | thread_cancel (listener->thread); | |
690 | close (listener->fd); | |
691 | listnode_delete (bm->listen_sockets, listener); | |
692 | XFREE (MTYPE_BGP_LISTENER, listener); | |
693 | } | |
694 | } |