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12e41d03 DL |
1 | /* |
2 | PIM for Quagga | |
3 | Copyright (C) 2008 Everton da Silva Marques | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, but | |
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; see the file COPYING; if not, write to the | |
17 | Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, | |
18 | MA 02110-1301 USA | |
19 | ||
20 | $QuaggaId: $Format:%an, %ai, %h$ $ | |
21 | */ | |
22 | ||
7a2fbbf0 | 23 | #include <zebra.h> |
12e41d03 DL |
24 | |
25 | #include <sys/types.h> | |
26 | #include <sys/socket.h> | |
27 | #include <netinet/in.h> | |
28 | #include <netinet/igmp.h> | |
29 | #include <arpa/inet.h> | |
30 | #include <unistd.h> | |
31 | #include <netdb.h> | |
32 | #include <errno.h> | |
33 | ||
12e41d03 DL |
34 | #include "log.h" |
35 | #include "privs.h" | |
9df99407 | 36 | #include "if.h" |
61ea3951 | 37 | #include "vrf.h" |
12e41d03 DL |
38 | |
39 | #include "pimd.h" | |
9df99407 | 40 | #include "pim_mroute.h" |
12e41d03 DL |
41 | #include "pim_sock.h" |
42 | #include "pim_str.h" | |
43 | #include "pim_igmp_join.h" | |
44 | ||
45 | /* GLOBAL VARS */ | |
46 | extern struct zebra_privs_t pimd_privs; | |
47 | ||
48 | int pim_socket_raw(int protocol) | |
49 | { | |
50 | int fd; | |
51 | ||
52 | if ( pimd_privs.change (ZPRIVS_RAISE) ) | |
53 | zlog_err ("pim_sockek_raw: could not raise privs, %s", | |
54 | safe_strerror (errno) ); | |
55 | ||
56 | fd = socket(AF_INET, SOCK_RAW, protocol); | |
57 | ||
58 | if ( pimd_privs.change (ZPRIVS_LOWER) ) | |
59 | zlog_err ("pim_socket_raw: could not lower privs, %s", | |
60 | safe_strerror (errno) ); | |
61 | ||
62 | if (fd < 0) { | |
63 | zlog_warn("Could not create raw socket: errno=%d: %s", | |
64 | errno, safe_strerror(errno)); | |
65 | return PIM_SOCK_ERR_SOCKET; | |
66 | } | |
67 | ||
68 | return fd; | |
69 | } | |
70 | ||
61ea3951 | 71 | int pim_socket_mcast(int protocol, struct in_addr ifaddr, int ifindex, int loop) |
12e41d03 DL |
72 | { |
73 | int fd; | |
74 | ||
75 | fd = pim_socket_raw(protocol); | |
76 | if (fd < 0) { | |
77 | zlog_warn("Could not create multicast socket: errno=%d: %s", | |
78 | errno, safe_strerror(errno)); | |
79 | return PIM_SOCK_ERR_SOCKET; | |
80 | } | |
81 | ||
61ea3951 DS |
82 | if (protocol == IPPROTO_PIM) |
83 | { | |
84 | int ret; | |
85 | struct interface *ifp = NULL; | |
86 | ||
87 | ifp = if_lookup_by_index_vrf (ifindex, VRF_DEFAULT); | |
88 | ||
89 | if (pimd_privs.change (ZPRIVS_RAISE)) | |
90 | zlog_err ("%s: could not raise privs, %s", | |
91 | __PRETTY_FUNCTION__, safe_strerror (errno)); | |
92 | ||
93 | ret = setsockopt (fd, SOL_SOCKET, | |
94 | SO_BINDTODEVICE, ifp->name, strlen (ifp->name)); | |
95 | ||
96 | if (pimd_privs.change (ZPRIVS_LOWER)) | |
97 | zlog_err ("%s: could not lower privs, %s", | |
98 | __PRETTY_FUNCTION__, safe_strerror (errno)); | |
99 | ||
100 | if (ret) | |
101 | { | |
102 | zlog_warn("Could not set fd: %d for interface: %s to device", | |
103 | fd, ifp->name); | |
104 | return PIM_SOCK_ERR_BIND; | |
105 | } | |
106 | } | |
107 | ||
108 | ||
12e41d03 DL |
109 | /* Needed to obtain destination address from recvmsg() */ |
110 | { | |
111 | #if defined(HAVE_IP_PKTINFO) | |
7ec30636 | 112 | /* Linux and Solaris IP_PKTINFO */ |
12e41d03 | 113 | int opt = 1; |
7ec30636 | 114 | if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &opt, sizeof(opt))) { |
12e41d03 DL |
115 | zlog_warn("Could not set IP_PKTINFO on socket fd=%d: errno=%d: %s", |
116 | fd, errno, safe_strerror(errno)); | |
117 | } | |
118 | #elif defined(HAVE_IP_RECVDSTADDR) | |
119 | /* BSD IP_RECVDSTADDR */ | |
120 | int opt = 1; | |
121 | if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &opt, sizeof(opt))) { | |
122 | zlog_warn("Could not set IP_RECVDSTADDR on socket fd=%d: errno=%d: %s", | |
123 | fd, errno, safe_strerror(errno)); | |
124 | } | |
125 | #else | |
126 | zlog_err("%s %s: Missing IP_PKTINFO and IP_RECVDSTADDR: unable to get dst addr from recvmsg()", | |
127 | __FILE__, __PRETTY_FUNCTION__); | |
128 | close(fd); | |
129 | return PIM_SOCK_ERR_DSTADDR; | |
130 | #endif | |
131 | } | |
132 | ||
133 | ||
134 | /* Set router alert (RFC 2113) for all IGMP messages (RFC 3376 4. Message Formats)*/ | |
135 | if (protocol == IPPROTO_IGMP) { | |
136 | char ra[4]; | |
137 | ra[0] = 148; | |
138 | ra[1] = 4; | |
139 | ra[2] = 0; | |
140 | ra[3] = 0; | |
141 | if (setsockopt(fd, IPPROTO_IP, IP_OPTIONS, ra, 4)) { | |
142 | zlog_warn("Could not set Router Alert Option on socket fd=%d: errno=%d: %s", | |
143 | fd, errno, safe_strerror(errno)); | |
144 | close(fd); | |
145 | return PIM_SOCK_ERR_RA; | |
146 | } | |
147 | } | |
148 | ||
149 | { | |
150 | int reuse = 1; | |
151 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, | |
152 | (void *) &reuse, sizeof(reuse))) { | |
153 | zlog_warn("Could not set Reuse Address Option on socket fd=%d: errno=%d: %s", | |
154 | fd, errno, safe_strerror(errno)); | |
155 | close(fd); | |
156 | return PIM_SOCK_ERR_REUSE; | |
157 | } | |
158 | } | |
159 | ||
160 | { | |
161 | const int MTTL = 1; | |
162 | int ttl = MTTL; | |
163 | if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, | |
164 | (void *) &ttl, sizeof(ttl))) { | |
165 | zlog_warn("Could not set multicast TTL=%d on socket fd=%d: errno=%d: %s", | |
166 | MTTL, fd, errno, safe_strerror(errno)); | |
167 | close(fd); | |
168 | return PIM_SOCK_ERR_TTL; | |
169 | } | |
170 | } | |
171 | ||
172 | if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, | |
173 | (void *) &loop, sizeof(loop))) { | |
174 | zlog_warn("Could not %s Multicast Loopback Option on socket fd=%d: errno=%d: %s", | |
175 | loop ? "enable" : "disable", | |
176 | fd, errno, safe_strerror(errno)); | |
177 | close(fd); | |
178 | return PIM_SOCK_ERR_LOOP; | |
179 | } | |
180 | ||
181 | if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, | |
182 | (void *) &ifaddr, sizeof(ifaddr))) { | |
183 | zlog_warn("Could not set Outgoing Interface Option on socket fd=%d: errno=%d: %s", | |
184 | fd, errno, safe_strerror(errno)); | |
185 | close(fd); | |
186 | return PIM_SOCK_ERR_IFACE; | |
187 | } | |
188 | ||
189 | { | |
190 | long flags; | |
191 | ||
192 | flags = fcntl(fd, F_GETFL, 0); | |
193 | if (flags < 0) { | |
194 | zlog_warn("Could not get fcntl(F_GETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s", | |
195 | fd, errno, safe_strerror(errno)); | |
196 | close(fd); | |
197 | return PIM_SOCK_ERR_NONBLOCK_GETFL; | |
198 | } | |
199 | ||
200 | if (fcntl(fd, F_SETFL, flags | O_NONBLOCK)) { | |
201 | zlog_warn("Could not set fcntl(F_SETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s", | |
202 | fd, errno, safe_strerror(errno)); | |
203 | close(fd); | |
204 | return PIM_SOCK_ERR_NONBLOCK_SETFL; | |
205 | } | |
206 | } | |
207 | ||
208 | return fd; | |
209 | } | |
210 | ||
211 | int pim_socket_join(int fd, struct in_addr group, | |
212 | struct in_addr ifaddr, int ifindex) | |
213 | { | |
214 | int ret; | |
215 | ||
216 | #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX | |
217 | struct ip_mreqn opt; | |
218 | #else | |
219 | struct ip_mreq opt; | |
220 | #endif | |
221 | ||
222 | opt.imr_multiaddr = group; | |
223 | ||
224 | #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX | |
225 | opt.imr_address = ifaddr; | |
226 | opt.imr_ifindex = ifindex; | |
227 | #else | |
228 | opt.imr_interface = ifaddr; | |
229 | #endif | |
230 | ||
231 | ret = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &opt, sizeof(opt)); | |
232 | if (ret) { | |
233 | char group_str[100]; | |
234 | char ifaddr_str[100]; | |
235 | if (!inet_ntop(AF_INET, &group, group_str , sizeof(group_str))) | |
236 | sprintf(group_str, "<group?>"); | |
237 | if (!inet_ntop(AF_INET, &ifaddr, ifaddr_str , sizeof(ifaddr_str))) | |
238 | sprintf(ifaddr_str, "<ifaddr?>"); | |
239 | ||
240 | zlog_err("Failure socket joining fd=%d group %s on interface address %s: errno=%d: %s", | |
241 | fd, group_str, ifaddr_str, errno, safe_strerror(errno)); | |
242 | return ret; | |
243 | } | |
244 | ||
245 | if (PIM_DEBUG_TRACE) { | |
246 | char group_str[100]; | |
247 | char ifaddr_str[100]; | |
248 | if (!inet_ntop(AF_INET, &group, group_str , sizeof(group_str))) | |
249 | sprintf(group_str, "<group?>"); | |
250 | if (!inet_ntop(AF_INET, &ifaddr, ifaddr_str , sizeof(ifaddr_str))) | |
251 | sprintf(ifaddr_str, "<ifaddr?>"); | |
252 | ||
253 | zlog_debug("Socket fd=%d joined group %s on interface address %s", | |
254 | fd, group_str, ifaddr_str); | |
255 | } | |
256 | ||
257 | return ret; | |
258 | } | |
259 | ||
260 | int pim_socket_join_source(int fd, int ifindex, | |
261 | struct in_addr group_addr, | |
262 | struct in_addr source_addr, | |
263 | const char *ifname) | |
264 | { | |
265 | if (pim_igmp_join_source(fd, ifindex, group_addr, source_addr)) { | |
266 | int e = errno; | |
267 | char group_str[100]; | |
268 | char source_str[100]; | |
269 | pim_inet4_dump("<grp?>", group_addr, group_str, sizeof(group_str)); | |
270 | pim_inet4_dump("<src?>", source_addr, source_str, sizeof(source_str)); | |
271 | zlog_warn("%s: setsockopt(fd=%d) failure for IGMP group %s source %s ifindex %d on interface %s: errno=%d: %s", | |
272 | __PRETTY_FUNCTION__, | |
273 | fd, group_str, source_str, ifindex, ifname, | |
274 | e, safe_strerror(e)); | |
275 | return -1; | |
276 | } | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
281 | int pim_socket_recvfromto(int fd, uint8_t *buf, size_t len, | |
282 | struct sockaddr_in *from, socklen_t *fromlen, | |
283 | struct sockaddr_in *to, socklen_t *tolen, | |
284 | int *ifindex) | |
285 | { | |
286 | struct msghdr msgh; | |
287 | struct cmsghdr *cmsg; | |
288 | struct iovec iov; | |
289 | char cbuf[1000]; | |
290 | int err; | |
291 | ||
292 | /* | |
293 | * IP_PKTINFO / IP_RECVDSTADDR don't yield sin_port. | |
294 | * Use getsockname() to get sin_port. | |
295 | */ | |
296 | if (to) { | |
297 | struct sockaddr_in si; | |
298 | socklen_t si_len = sizeof(si); | |
299 | ||
300 | ((struct sockaddr_in *) to)->sin_family = AF_INET; | |
301 | ||
302 | if (pim_socket_getsockname(fd, (struct sockaddr *) &si, &si_len)) { | |
303 | ((struct sockaddr_in *) to)->sin_port = ntohs(0); | |
304 | ((struct sockaddr_in *) to)->sin_addr.s_addr = ntohl(0); | |
305 | } | |
306 | else { | |
307 | ((struct sockaddr_in *) to)->sin_port = si.sin_port; | |
308 | ((struct sockaddr_in *) to)->sin_addr = si.sin_addr; | |
309 | } | |
310 | ||
311 | if (tolen) | |
312 | *tolen = sizeof(si); | |
313 | } | |
314 | ||
315 | memset(&msgh, 0, sizeof(struct msghdr)); | |
316 | iov.iov_base = buf; | |
317 | iov.iov_len = len; | |
318 | msgh.msg_control = cbuf; | |
319 | msgh.msg_controllen = sizeof(cbuf); | |
320 | msgh.msg_name = from; | |
321 | msgh.msg_namelen = fromlen ? *fromlen : 0; | |
322 | msgh.msg_iov = &iov; | |
323 | msgh.msg_iovlen = 1; | |
324 | msgh.msg_flags = 0; | |
325 | ||
326 | err = recvmsg(fd, &msgh, 0); | |
327 | if (err < 0) | |
328 | return err; | |
329 | ||
330 | if (fromlen) | |
331 | *fromlen = msgh.msg_namelen; | |
332 | ||
333 | for (cmsg = CMSG_FIRSTHDR(&msgh); | |
334 | cmsg != NULL; | |
335 | cmsg = CMSG_NXTHDR(&msgh,cmsg)) { | |
336 | ||
337 | #ifdef HAVE_IP_PKTINFO | |
7ec30636 | 338 | if ((cmsg->cmsg_level == IPPROTO_IP) && (cmsg->cmsg_type == IP_PKTINFO)) { |
12e41d03 DL |
339 | struct in_pktinfo *i = (struct in_pktinfo *) CMSG_DATA(cmsg); |
340 | if (to) | |
341 | ((struct sockaddr_in *) to)->sin_addr = i->ipi_addr; | |
342 | if (tolen) | |
343 | *tolen = sizeof(struct sockaddr_in); | |
344 | if (ifindex) | |
345 | *ifindex = i->ipi_ifindex; | |
346 | ||
347 | if (to && PIM_DEBUG_PACKETS) { | |
348 | char to_str[100]; | |
349 | pim_inet4_dump("<to?>", to->sin_addr, to_str, sizeof(to_str)); | |
350 | zlog_debug("%s: HAVE_IP_PKTINFO to=%s,%d", | |
351 | __PRETTY_FUNCTION__, | |
352 | to_str, ntohs(to->sin_port)); | |
353 | } | |
354 | ||
355 | break; | |
356 | } | |
357 | #endif | |
358 | ||
359 | #ifdef HAVE_IP_RECVDSTADDR | |
360 | if ((cmsg->cmsg_level == IPPROTO_IP) && (cmsg->cmsg_type == IP_RECVDSTADDR)) { | |
361 | struct in_addr *i = (struct in_addr *) CMSG_DATA(cmsg); | |
362 | if (to) | |
363 | ((struct sockaddr_in *) to)->sin_addr = *i; | |
364 | if (tolen) | |
365 | *tolen = sizeof(struct sockaddr_in); | |
366 | ||
367 | if (to && PIM_DEBUG_PACKETS) { | |
368 | char to_str[100]; | |
369 | pim_inet4_dump("<to?>", to->sin_addr, to_str, sizeof(to_str)); | |
370 | zlog_debug("%s: HAVE_IP_RECVDSTADDR to=%s,%d", | |
371 | __PRETTY_FUNCTION__, | |
372 | to_str, ntohs(to->sin_port)); | |
373 | } | |
374 | ||
375 | break; | |
376 | } | |
377 | #endif | |
378 | ||
379 | #if defined(HAVE_IP_RECVIF) && defined(CMSG_IFINDEX) | |
380 | if (cmsg->cmsg_type == IP_RECVIF) | |
381 | if (ifindex) | |
382 | *ifindex = CMSG_IFINDEX(cmsg); | |
383 | #endif | |
384 | ||
385 | } /* for (cmsg) */ | |
386 | ||
387 | return err; /* len */ | |
388 | } | |
389 | ||
390 | int pim_socket_mcastloop_get(int fd) | |
391 | { | |
392 | int loop; | |
393 | socklen_t loop_len = sizeof(loop); | |
394 | ||
395 | if (getsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, | |
396 | &loop, &loop_len)) { | |
397 | int e = errno; | |
398 | zlog_warn("Could not get Multicast Loopback Option on socket fd=%d: errno=%d: %s", | |
399 | fd, errno, safe_strerror(errno)); | |
400 | errno = e; | |
401 | return PIM_SOCK_ERR_LOOP; | |
402 | } | |
403 | ||
404 | return loop; | |
405 | } | |
406 | ||
407 | int pim_socket_getsockname(int fd, struct sockaddr *name, socklen_t *namelen) | |
408 | { | |
409 | if (getsockname(fd, name, namelen)) { | |
410 | int e = errno; | |
411 | zlog_warn("Could not get Socket Name for socket fd=%d: errno=%d: %s", | |
412 | fd, errno, safe_strerror(errno)); | |
413 | errno = e; | |
414 | return PIM_SOCK_ERR_NAME; | |
415 | } | |
416 | ||
417 | return PIM_SOCK_ERR_NONE; | |
418 | } |