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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" | |
25 | #include "memory.h" | |
26 | #include "log.h" | |
27 | #include "if.h" | |
28 | #include "prefix.h" | |
29 | #include "command.h" | |
edd7c245 | 30 | #include "privs.h" |
718e3744 | 31 | |
32 | #include "bgpd/bgpd.h" | |
33 | #include "bgpd/bgp_fsm.h" | |
34 | #include "bgpd/bgp_attr.h" | |
35 | #include "bgpd/bgp_debug.h" | |
36 | #include "bgpd/bgp_network.h" | |
edd7c245 | 37 | |
38 | extern struct zebra_privs_t bgpd_privs; | |
39 | ||
718e3744 | 40 | \f |
41 | /* Accept bgp connection. */ | |
42 | static int | |
43 | bgp_accept (struct thread *thread) | |
44 | { | |
45 | int bgp_sock; | |
46 | int accept_sock; | |
47 | union sockunion su; | |
48 | struct peer *peer; | |
eb821189 | 49 | struct peer *peer1; |
718e3744 | 50 | struct bgp *bgp; |
51 | char buf[SU_ADDRSTRLEN]; | |
52 | ||
53 | /* Regiser accept thread. */ | |
54 | accept_sock = THREAD_FD (thread); | |
55 | bgp = THREAD_ARG (thread); | |
56 | ||
57 | if (accept_sock < 0) | |
58 | { | |
59 | zlog_err ("accept_sock is nevative value %d", accept_sock); | |
60 | return -1; | |
61 | } | |
62 | thread_add_read (master, bgp_accept, bgp, accept_sock); | |
63 | ||
64 | /* Accept client connection. */ | |
65 | bgp_sock = sockunion_accept (accept_sock, &su); | |
66 | if (bgp_sock < 0) | |
67 | { | |
6099b3b5 | 68 | zlog_err ("[Error] BGP socket accept failed (%s)", safe_strerror (errno)); |
718e3744 | 69 | return -1; |
70 | } | |
71 | ||
72 | if (BGP_DEBUG (events, EVENTS)) | |
478ba054 | 73 | zlog_debug ("[Event] BGP connection from host %s", inet_sutop (&su, buf)); |
718e3744 | 74 | |
75 | /* Check remote IP address */ | |
eb821189 | 76 | peer1 = peer_lookup (bgp, &su); |
77 | if (! peer1 || peer1->status == Idle) | |
718e3744 | 78 | { |
79 | if (BGP_DEBUG (events, EVENTS)) | |
80 | { | |
eb821189 | 81 | if (! peer1) |
478ba054 | 82 | zlog_debug ("[Event] BGP connection IP address %s is not configured", |
718e3744 | 83 | inet_sutop (&su, buf)); |
84 | else | |
478ba054 | 85 | zlog_debug ("[Event] BGP connection IP address %s is Idle state", |
718e3744 | 86 | inet_sutop (&su, buf)); |
87 | } | |
88 | close (bgp_sock); | |
89 | return -1; | |
90 | } | |
91 | ||
92 | /* In case of peer is EBGP, we should set TTL for this connection. */ | |
eb821189 | 93 | if (peer_sort (peer1) == BGP_PEER_EBGP) |
94 | sockopt_ttl (peer1->su.sa.sa_family, bgp_sock, peer1->ttl); | |
718e3744 | 95 | |
96 | if (! bgp) | |
eb821189 | 97 | bgp = peer1->bgp; |
98 | ||
99 | /* Make dummy peer until read Open packet. */ | |
100 | if (BGP_DEBUG (events, EVENTS)) | |
478ba054 | 101 | zlog_debug ("[Event] Make dummy peer structure until read Open packet"); |
eb821189 | 102 | |
103 | { | |
104 | char buf[SU_ADDRSTRLEN + 1]; | |
105 | ||
106 | peer = peer_create_accept (bgp); | |
107 | SET_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER); | |
108 | peer->su = su; | |
109 | peer->fd = bgp_sock; | |
110 | peer->status = Active; | |
111 | peer->local_id = peer1->local_id; | |
718e3744 | 112 | |
eb821189 | 113 | /* Make peer's address string. */ |
114 | sockunion2str (&su, buf, SU_ADDRSTRLEN); | |
e83e2080 | 115 | peer->host = XSTRDUP (MTYPE_BGP_PEER_HOST, buf); |
eb821189 | 116 | } |
718e3744 | 117 | |
118 | BGP_EVENT_ADD (peer, TCP_connection_open); | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | /* BGP socket bind. */ | |
94f2b392 | 124 | static int |
718e3744 | 125 | bgp_bind (struct peer *peer) |
126 | { | |
127 | #ifdef SO_BINDTODEVICE | |
128 | int ret; | |
129 | struct ifreq ifreq; | |
130 | ||
131 | if (! peer->ifname) | |
132 | return 0; | |
133 | ||
134 | strncpy ((char *)&ifreq.ifr_name, peer->ifname, sizeof (ifreq.ifr_name)); | |
135 | ||
98f5163c | 136 | if ( bgpd_privs.change (ZPRIVS_RAISE) ) |
137 | zlog_err ("bgp_bind: could not raise privs"); | |
138 | ||
eb821189 | 139 | ret = setsockopt (peer->fd, SOL_SOCKET, SO_BINDTODEVICE, |
718e3744 | 140 | &ifreq, sizeof (ifreq)); |
98f5163c | 141 | |
142 | if (bgpd_privs.change (ZPRIVS_LOWER) ) | |
143 | zlog_err ("bgp_bind: could not lower privs"); | |
144 | ||
718e3744 | 145 | if (ret < 0) |
146 | { | |
147 | zlog (peer->log, LOG_INFO, "bind to interface %s failed", peer->ifname); | |
148 | return ret; | |
149 | } | |
150 | #endif /* SO_BINDTODEVICE */ | |
151 | return 0; | |
152 | } | |
153 | ||
94f2b392 | 154 | static int |
718e3744 | 155 | bgp_bind_address (int sock, struct in_addr *addr) |
156 | { | |
157 | int ret; | |
158 | struct sockaddr_in local; | |
159 | ||
160 | memset (&local, 0, sizeof (struct sockaddr_in)); | |
161 | local.sin_family = AF_INET; | |
6f0e3f6e | 162 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
718e3744 | 163 | local.sin_len = sizeof(struct sockaddr_in); |
6f0e3f6e | 164 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
718e3744 | 165 | memcpy (&local.sin_addr, addr, sizeof (struct in_addr)); |
166 | ||
edd7c245 | 167 | if ( bgpd_privs.change (ZPRIVS_RAISE) ) |
168 | zlog_err ("bgp_bind_address: could not raise privs"); | |
169 | ||
718e3744 | 170 | ret = bind (sock, (struct sockaddr *)&local, sizeof (struct sockaddr_in)); |
171 | if (ret < 0) | |
172 | ; | |
edd7c245 | 173 | |
174 | if (bgpd_privs.change (ZPRIVS_LOWER) ) | |
175 | zlog_err ("bgp_bind_address: could not lower privs"); | |
176 | ||
718e3744 | 177 | return 0; |
178 | } | |
179 | ||
94f2b392 | 180 | static struct in_addr * |
718e3744 | 181 | bgp_update_address (struct interface *ifp) |
182 | { | |
183 | struct prefix_ipv4 *p; | |
184 | struct connected *connected; | |
52dc7ee6 | 185 | struct listnode *node; |
718e3744 | 186 | |
1eb8ef25 | 187 | for (ALL_LIST_ELEMENTS_RO (ifp->connected, node, connected)) |
718e3744 | 188 | { |
718e3744 | 189 | p = (struct prefix_ipv4 *) connected->address; |
190 | ||
191 | if (p->family == AF_INET) | |
192 | return &p->prefix; | |
193 | } | |
194 | return NULL; | |
195 | } | |
196 | ||
197 | /* Update source selection. */ | |
94f2b392 | 198 | static void |
718e3744 | 199 | bgp_update_source (struct peer *peer) |
200 | { | |
201 | struct interface *ifp; | |
202 | struct in_addr *addr; | |
203 | ||
204 | /* Source is specified with interface name. */ | |
205 | if (peer->update_if) | |
206 | { | |
207 | ifp = if_lookup_by_name (peer->update_if); | |
208 | if (! ifp) | |
209 | return; | |
210 | ||
211 | addr = bgp_update_address (ifp); | |
212 | if (! addr) | |
213 | return; | |
214 | ||
eb821189 | 215 | bgp_bind_address (peer->fd, addr); |
718e3744 | 216 | } |
217 | ||
218 | /* Source is specified with IP address. */ | |
219 | if (peer->update_source) | |
eb821189 | 220 | sockunion_bind (peer->fd, peer->update_source, 0, peer->update_source); |
718e3744 | 221 | } |
222 | ||
223 | /* BGP try to connect to the peer. */ | |
224 | int | |
225 | bgp_connect (struct peer *peer) | |
226 | { | |
227 | unsigned int ifindex = 0; | |
228 | ||
229 | /* Make socket for the peer. */ | |
eb821189 | 230 | peer->fd = sockunion_socket (&peer->su); |
231 | if (peer->fd < 0) | |
718e3744 | 232 | return -1; |
233 | ||
234 | /* If we can get socket for the peer, adjest TTL and make connection. */ | |
235 | if (peer_sort (peer) == BGP_PEER_EBGP) | |
eb821189 | 236 | sockopt_ttl (peer->su.sa.sa_family, peer->fd, peer->ttl); |
718e3744 | 237 | |
eb821189 | 238 | sockopt_reuseaddr (peer->fd); |
239 | sockopt_reuseport (peer->fd); | |
718e3744 | 240 | |
241 | /* Bind socket. */ | |
242 | bgp_bind (peer); | |
243 | ||
244 | /* Update source bind. */ | |
245 | bgp_update_source (peer); | |
246 | ||
247 | #ifdef HAVE_IPV6 | |
248 | if (peer->ifname) | |
249 | ifindex = if_nametoindex (peer->ifname); | |
250 | #endif /* HAVE_IPV6 */ | |
251 | ||
252 | if (BGP_DEBUG (events, EVENTS)) | |
478ba054 | 253 | plog_debug (peer->log, "%s [Event] Connect start to %s fd %d", |
eb821189 | 254 | peer->host, peer->host, peer->fd); |
718e3744 | 255 | |
256 | /* Connect to the remote peer. */ | |
eb821189 | 257 | return sockunion_connect (peer->fd, &peer->su, htons (peer->port), ifindex); |
718e3744 | 258 | } |
259 | ||
260 | /* After TCP connection is established. Get local address and port. */ | |
261 | void | |
262 | bgp_getsockname (struct peer *peer) | |
263 | { | |
264 | if (peer->su_local) | |
265 | { | |
22db9dec | 266 | sockunion_free (peer->su_local); |
718e3744 | 267 | peer->su_local = NULL; |
268 | } | |
269 | ||
270 | if (peer->su_remote) | |
271 | { | |
22db9dec | 272 | sockunion_free (peer->su_remote); |
718e3744 | 273 | peer->su_remote = NULL; |
274 | } | |
275 | ||
eb821189 | 276 | peer->su_local = sockunion_getsockname (peer->fd); |
277 | peer->su_remote = sockunion_getpeername (peer->fd); | |
718e3744 | 278 | |
279 | bgp_nexthop_set (peer->su_local, peer->su_remote, &peer->nexthop, peer); | |
280 | } | |
281 | ||
282 | /* IPv6 supported version of BGP server socket setup. */ | |
283 | #if defined (HAVE_IPV6) && ! defined (NRL) | |
284 | int | |
285 | bgp_socket (struct bgp *bgp, unsigned short port) | |
286 | { | |
10d60ad1 | 287 | int ret, en; |
718e3744 | 288 | struct addrinfo req; |
289 | struct addrinfo *ainfo; | |
290 | struct addrinfo *ainfo_save; | |
291 | int sock = 0; | |
292 | char port_str[BUFSIZ]; | |
293 | ||
294 | memset (&req, 0, sizeof (struct addrinfo)); | |
295 | ||
296 | req.ai_flags = AI_PASSIVE; | |
297 | req.ai_family = AF_UNSPEC; | |
298 | req.ai_socktype = SOCK_STREAM; | |
299 | sprintf (port_str, "%d", port); | |
300 | port_str[sizeof (port_str) - 1] = '\0'; | |
301 | ||
302 | ret = getaddrinfo (NULL, port_str, &req, &ainfo); | |
303 | if (ret != 0) | |
304 | { | |
305 | zlog_err ("getaddrinfo: %s", gai_strerror (ret)); | |
306 | return -1; | |
307 | } | |
308 | ||
309 | ainfo_save = ainfo; | |
310 | ||
311 | do | |
312 | { | |
313 | if (ainfo->ai_family != AF_INET && ainfo->ai_family != AF_INET6) | |
314 | continue; | |
315 | ||
316 | sock = socket (ainfo->ai_family, ainfo->ai_socktype, ainfo->ai_protocol); | |
317 | if (sock < 0) | |
318 | { | |
6099b3b5 | 319 | zlog_err ("socket: %s", safe_strerror (errno)); |
718e3744 | 320 | continue; |
321 | } | |
322 | ||
323 | sockopt_reuseaddr (sock); | |
324 | sockopt_reuseport (sock); | |
edd7c245 | 325 | |
326 | if (bgpd_privs.change (ZPRIVS_RAISE) ) | |
327 | zlog_err ("bgp_socket: could not raise privs"); | |
718e3744 | 328 | |
329 | ret = bind (sock, ainfo->ai_addr, ainfo->ai_addrlen); | |
10d60ad1 | 330 | en = errno; |
331 | if (bgpd_privs.change (ZPRIVS_LOWER) ) | |
332 | zlog_err ("bgp_bind_address: could not lower privs"); | |
333 | ||
718e3744 | 334 | if (ret < 0) |
335 | { | |
6099b3b5 | 336 | zlog_err ("bind: %s", safe_strerror (en)); |
10d60ad1 | 337 | close(sock); |
718e3744 | 338 | continue; |
339 | } | |
edd7c245 | 340 | |
718e3744 | 341 | ret = listen (sock, 3); |
342 | if (ret < 0) | |
343 | { | |
6099b3b5 | 344 | zlog_err ("listen: %s", safe_strerror (errno)); |
718e3744 | 345 | close (sock); |
346 | continue; | |
347 | } | |
348 | ||
349 | thread_add_read (master, bgp_accept, bgp, sock); | |
350 | } | |
351 | while ((ainfo = ainfo->ai_next) != NULL); | |
352 | ||
353 | freeaddrinfo (ainfo_save); | |
354 | ||
355 | return sock; | |
356 | } | |
357 | #else | |
358 | /* Traditional IPv4 only version. */ | |
359 | int | |
360 | bgp_socket (struct bgp *bgp, unsigned short port) | |
361 | { | |
362 | int sock; | |
363 | int socklen; | |
364 | struct sockaddr_in sin; | |
4a1a2716 | 365 | int ret, en; |
718e3744 | 366 | |
367 | sock = socket (AF_INET, SOCK_STREAM, 0); | |
368 | if (sock < 0) | |
369 | { | |
6099b3b5 | 370 | zlog_err ("socket: %s", safe_strerror (errno)); |
718e3744 | 371 | return sock; |
372 | } | |
373 | ||
374 | sockopt_reuseaddr (sock); | |
375 | sockopt_reuseport (sock); | |
376 | ||
377 | memset (&sin, 0, sizeof (struct sockaddr_in)); | |
378 | ||
379 | sin.sin_family = AF_INET; | |
380 | sin.sin_port = htons (port); | |
381 | socklen = sizeof (struct sockaddr_in); | |
6f0e3f6e | 382 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
718e3744 | 383 | sin.sin_len = socklen; |
6f0e3f6e | 384 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
718e3744 | 385 | |
edd7c245 | 386 | if ( bgpd_privs.change (ZPRIVS_RAISE) ) |
387 | zlog_err ("bgp_socket: could not raise privs"); | |
388 | ||
718e3744 | 389 | ret = bind (sock, (struct sockaddr *) &sin, socklen); |
10d60ad1 | 390 | en = errno; |
391 | ||
392 | if (bgpd_privs.change (ZPRIVS_LOWER) ) | |
393 | zlog_err ("bgp_socket: could not lower privs"); | |
394 | ||
718e3744 | 395 | if (ret < 0) |
396 | { | |
6099b3b5 | 397 | zlog_err ("bind: %s", safe_strerror (en)); |
718e3744 | 398 | close (sock); |
399 | return ret; | |
400 | } | |
edd7c245 | 401 | |
718e3744 | 402 | ret = listen (sock, 3); |
403 | if (ret < 0) | |
404 | { | |
6099b3b5 | 405 | zlog_err ("listen: %s", safe_strerror (errno)); |
718e3744 | 406 | close (sock); |
407 | return ret; | |
408 | } | |
409 | ||
410 | thread_add_read (bm->master, bgp_accept, bgp, sock); | |
411 | ||
412 | return sock; | |
413 | } | |
414 | #endif /* HAVE_IPV6 && !NRL */ |