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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 | { | |
68 | zlog_err ("[Error] BGP socket accept failed (%s)", strerror (errno)); | |
69 | return -1; | |
70 | } | |
71 | ||
72 | if (BGP_DEBUG (events, EVENTS)) | |
73 | zlog_info ("[Event] BGP connection from host %s", inet_sutop (&su, buf)); | |
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) |
718e3744 | 82 | zlog_info ("[Event] BGP connection IP address %s is not configured", |
83 | inet_sutop (&su, buf)); | |
84 | else | |
85 | zlog_info ("[Event] BGP connection IP address %s is Idle state", | |
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)) | |
101 | zlog_info ("[Event] Make dummy peer structure until read Open packet"); | |
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); | |
115 | peer->host = strdup (buf); | |
116 | } | |
718e3744 | 117 | |
118 | BGP_EVENT_ADD (peer, TCP_connection_open); | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | /* BGP socket bind. */ | |
124 | int | |
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 | ||
154 | int | |
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; | |
162 | #ifdef HAVE_SIN_LEN | |
163 | local.sin_len = sizeof(struct sockaddr_in); | |
164 | #endif /* HAVE_SIN_LEN */ | |
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 | ||
180 | struct in_addr * | |
181 | bgp_update_address (struct interface *ifp) | |
182 | { | |
183 | struct prefix_ipv4 *p; | |
184 | struct connected *connected; | |
52dc7ee6 | 185 | struct listnode *node; |
718e3744 | 186 | |
187 | for (node = listhead (ifp->connected); node; nextnode (node)) | |
188 | { | |
189 | connected = getdata (node); | |
190 | ||
191 | p = (struct prefix_ipv4 *) connected->address; | |
192 | ||
193 | if (p->family == AF_INET) | |
194 | return &p->prefix; | |
195 | } | |
196 | return NULL; | |
197 | } | |
198 | ||
199 | /* Update source selection. */ | |
200 | void | |
201 | bgp_update_source (struct peer *peer) | |
202 | { | |
203 | struct interface *ifp; | |
204 | struct in_addr *addr; | |
205 | ||
206 | /* Source is specified with interface name. */ | |
207 | if (peer->update_if) | |
208 | { | |
209 | ifp = if_lookup_by_name (peer->update_if); | |
210 | if (! ifp) | |
211 | return; | |
212 | ||
213 | addr = bgp_update_address (ifp); | |
214 | if (! addr) | |
215 | return; | |
216 | ||
eb821189 | 217 | bgp_bind_address (peer->fd, addr); |
718e3744 | 218 | } |
219 | ||
220 | /* Source is specified with IP address. */ | |
221 | if (peer->update_source) | |
eb821189 | 222 | sockunion_bind (peer->fd, peer->update_source, 0, peer->update_source); |
718e3744 | 223 | } |
224 | ||
225 | /* BGP try to connect to the peer. */ | |
226 | int | |
227 | bgp_connect (struct peer *peer) | |
228 | { | |
229 | unsigned int ifindex = 0; | |
230 | ||
231 | /* Make socket for the peer. */ | |
eb821189 | 232 | peer->fd = sockunion_socket (&peer->su); |
233 | if (peer->fd < 0) | |
718e3744 | 234 | return -1; |
235 | ||
236 | /* If we can get socket for the peer, adjest TTL and make connection. */ | |
237 | if (peer_sort (peer) == BGP_PEER_EBGP) | |
eb821189 | 238 | sockopt_ttl (peer->su.sa.sa_family, peer->fd, peer->ttl); |
718e3744 | 239 | |
eb821189 | 240 | sockopt_reuseaddr (peer->fd); |
241 | sockopt_reuseport (peer->fd); | |
718e3744 | 242 | |
243 | /* Bind socket. */ | |
244 | bgp_bind (peer); | |
245 | ||
246 | /* Update source bind. */ | |
247 | bgp_update_source (peer); | |
248 | ||
249 | #ifdef HAVE_IPV6 | |
250 | if (peer->ifname) | |
251 | ifindex = if_nametoindex (peer->ifname); | |
252 | #endif /* HAVE_IPV6 */ | |
253 | ||
254 | if (BGP_DEBUG (events, EVENTS)) | |
255 | plog_info (peer->log, "%s [Event] Connect start to %s fd %d", | |
eb821189 | 256 | peer->host, peer->host, peer->fd); |
718e3744 | 257 | |
258 | /* Connect to the remote peer. */ | |
eb821189 | 259 | return sockunion_connect (peer->fd, &peer->su, htons (peer->port), ifindex); |
718e3744 | 260 | } |
261 | ||
262 | /* After TCP connection is established. Get local address and port. */ | |
263 | void | |
264 | bgp_getsockname (struct peer *peer) | |
265 | { | |
266 | if (peer->su_local) | |
267 | { | |
268 | XFREE (MTYPE_TMP, peer->su_local); | |
269 | peer->su_local = NULL; | |
270 | } | |
271 | ||
272 | if (peer->su_remote) | |
273 | { | |
274 | XFREE (MTYPE_TMP, peer->su_remote); | |
275 | peer->su_remote = NULL; | |
276 | } | |
277 | ||
eb821189 | 278 | peer->su_local = sockunion_getsockname (peer->fd); |
279 | peer->su_remote = sockunion_getpeername (peer->fd); | |
718e3744 | 280 | |
281 | bgp_nexthop_set (peer->su_local, peer->su_remote, &peer->nexthop, peer); | |
282 | } | |
283 | ||
284 | /* IPv6 supported version of BGP server socket setup. */ | |
285 | #if defined (HAVE_IPV6) && ! defined (NRL) | |
286 | int | |
287 | bgp_socket (struct bgp *bgp, unsigned short port) | |
288 | { | |
10d60ad1 | 289 | int ret, en; |
718e3744 | 290 | struct addrinfo req; |
291 | struct addrinfo *ainfo; | |
292 | struct addrinfo *ainfo_save; | |
293 | int sock = 0; | |
294 | char port_str[BUFSIZ]; | |
295 | ||
296 | memset (&req, 0, sizeof (struct addrinfo)); | |
297 | ||
298 | req.ai_flags = AI_PASSIVE; | |
299 | req.ai_family = AF_UNSPEC; | |
300 | req.ai_socktype = SOCK_STREAM; | |
301 | sprintf (port_str, "%d", port); | |
302 | port_str[sizeof (port_str) - 1] = '\0'; | |
303 | ||
304 | ret = getaddrinfo (NULL, port_str, &req, &ainfo); | |
305 | if (ret != 0) | |
306 | { | |
307 | zlog_err ("getaddrinfo: %s", gai_strerror (ret)); | |
308 | return -1; | |
309 | } | |
310 | ||
311 | ainfo_save = ainfo; | |
312 | ||
313 | do | |
314 | { | |
315 | if (ainfo->ai_family != AF_INET && ainfo->ai_family != AF_INET6) | |
316 | continue; | |
317 | ||
318 | sock = socket (ainfo->ai_family, ainfo->ai_socktype, ainfo->ai_protocol); | |
319 | if (sock < 0) | |
320 | { | |
321 | zlog_err ("socket: %s", strerror (errno)); | |
322 | continue; | |
323 | } | |
324 | ||
325 | sockopt_reuseaddr (sock); | |
326 | sockopt_reuseport (sock); | |
edd7c245 | 327 | |
328 | if (bgpd_privs.change (ZPRIVS_RAISE) ) | |
329 | zlog_err ("bgp_socket: could not raise privs"); | |
718e3744 | 330 | |
331 | ret = bind (sock, ainfo->ai_addr, ainfo->ai_addrlen); | |
10d60ad1 | 332 | en = errno; |
333 | if (bgpd_privs.change (ZPRIVS_LOWER) ) | |
334 | zlog_err ("bgp_bind_address: could not lower privs"); | |
335 | ||
718e3744 | 336 | if (ret < 0) |
337 | { | |
10d60ad1 | 338 | zlog_err ("bind: %s", strerror (en)); |
339 | close(sock); | |
718e3744 | 340 | continue; |
341 | } | |
edd7c245 | 342 | |
718e3744 | 343 | ret = listen (sock, 3); |
344 | if (ret < 0) | |
345 | { | |
346 | zlog_err ("listen: %s", strerror (errno)); | |
347 | close (sock); | |
348 | continue; | |
349 | } | |
350 | ||
351 | thread_add_read (master, bgp_accept, bgp, sock); | |
352 | } | |
353 | while ((ainfo = ainfo->ai_next) != NULL); | |
354 | ||
355 | freeaddrinfo (ainfo_save); | |
356 | ||
357 | return sock; | |
358 | } | |
359 | #else | |
360 | /* Traditional IPv4 only version. */ | |
361 | int | |
362 | bgp_socket (struct bgp *bgp, unsigned short port) | |
363 | { | |
364 | int sock; | |
365 | int socklen; | |
366 | struct sockaddr_in sin; | |
4a1a2716 | 367 | int ret, en; |
718e3744 | 368 | |
369 | sock = socket (AF_INET, SOCK_STREAM, 0); | |
370 | if (sock < 0) | |
371 | { | |
372 | zlog_err ("socket: %s", strerror (errno)); | |
373 | return sock; | |
374 | } | |
375 | ||
376 | sockopt_reuseaddr (sock); | |
377 | sockopt_reuseport (sock); | |
378 | ||
379 | memset (&sin, 0, sizeof (struct sockaddr_in)); | |
380 | ||
381 | sin.sin_family = AF_INET; | |
382 | sin.sin_port = htons (port); | |
383 | socklen = sizeof (struct sockaddr_in); | |
384 | #ifdef HAVE_SIN_LEN | |
385 | sin.sin_len = socklen; | |
386 | #endif /* HAVE_SIN_LEN */ | |
387 | ||
edd7c245 | 388 | if ( bgpd_privs.change (ZPRIVS_RAISE) ) |
389 | zlog_err ("bgp_socket: could not raise privs"); | |
390 | ||
718e3744 | 391 | ret = bind (sock, (struct sockaddr *) &sin, socklen); |
10d60ad1 | 392 | en = errno; |
393 | ||
394 | if (bgpd_privs.change (ZPRIVS_LOWER) ) | |
395 | zlog_err ("bgp_socket: could not lower privs"); | |
396 | ||
718e3744 | 397 | if (ret < 0) |
398 | { | |
10d60ad1 | 399 | zlog_err ("bind: %s", strerror (en)); |
718e3744 | 400 | close (sock); |
401 | return ret; | |
402 | } | |
edd7c245 | 403 | |
718e3744 | 404 | ret = listen (sock, 3); |
405 | if (ret < 0) | |
406 | { | |
407 | zlog_err ("listen: %s", strerror (errno)); | |
408 | close (sock); | |
409 | return ret; | |
410 | } | |
411 | ||
412 | thread_add_read (bm->master, bgp_accept, bgp, sock); | |
413 | ||
414 | return sock; | |
415 | } | |
416 | #endif /* HAVE_IPV6 && !NRL */ |