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