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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 | ||
6bcd6029 | 82 | #ifdef SO_BINDTODEVICE |
61ea3951 DS |
83 | if (protocol == IPPROTO_PIM) |
84 | { | |
85 | int ret; | |
86 | struct interface *ifp = NULL; | |
87 | ||
88 | ifp = if_lookup_by_index_vrf (ifindex, VRF_DEFAULT); | |
89 | ||
90 | if (pimd_privs.change (ZPRIVS_RAISE)) | |
91 | zlog_err ("%s: could not raise privs, %s", | |
92 | __PRETTY_FUNCTION__, safe_strerror (errno)); | |
93 | ||
94 | ret = setsockopt (fd, SOL_SOCKET, | |
95 | SO_BINDTODEVICE, ifp->name, strlen (ifp->name)); | |
96 | ||
97 | if (pimd_privs.change (ZPRIVS_LOWER)) | |
98 | zlog_err ("%s: could not lower privs, %s", | |
99 | __PRETTY_FUNCTION__, safe_strerror (errno)); | |
100 | ||
101 | if (ret) | |
102 | { | |
103 | zlog_warn("Could not set fd: %d for interface: %s to device", | |
104 | fd, ifp->name); | |
105 | return PIM_SOCK_ERR_BIND; | |
106 | } | |
107 | } | |
6bcd6029 DL |
108 | #else |
109 | /* XXX: use IP_PKTINFO / IP_RECVIF to emulate behaviour? Or change to | |
110 | * only use 1 socket for all interfaces? */ | |
111 | #endif | |
61ea3951 | 112 | |
12e41d03 DL |
113 | /* Needed to obtain destination address from recvmsg() */ |
114 | { | |
115 | #if defined(HAVE_IP_PKTINFO) | |
7ec30636 | 116 | /* Linux and Solaris IP_PKTINFO */ |
12e41d03 | 117 | int opt = 1; |
7ec30636 | 118 | if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &opt, sizeof(opt))) { |
12e41d03 DL |
119 | zlog_warn("Could not set IP_PKTINFO on socket fd=%d: errno=%d: %s", |
120 | fd, errno, safe_strerror(errno)); | |
121 | } | |
122 | #elif defined(HAVE_IP_RECVDSTADDR) | |
123 | /* BSD IP_RECVDSTADDR */ | |
124 | int opt = 1; | |
125 | if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &opt, sizeof(opt))) { | |
126 | zlog_warn("Could not set IP_RECVDSTADDR on socket fd=%d: errno=%d: %s", | |
127 | fd, errno, safe_strerror(errno)); | |
128 | } | |
129 | #else | |
130 | zlog_err("%s %s: Missing IP_PKTINFO and IP_RECVDSTADDR: unable to get dst addr from recvmsg()", | |
131 | __FILE__, __PRETTY_FUNCTION__); | |
132 | close(fd); | |
133 | return PIM_SOCK_ERR_DSTADDR; | |
134 | #endif | |
135 | } | |
136 | ||
137 | ||
138 | /* Set router alert (RFC 2113) for all IGMP messages (RFC 3376 4. Message Formats)*/ | |
139 | if (protocol == IPPROTO_IGMP) { | |
140 | char ra[4]; | |
141 | ra[0] = 148; | |
142 | ra[1] = 4; | |
143 | ra[2] = 0; | |
144 | ra[3] = 0; | |
145 | if (setsockopt(fd, IPPROTO_IP, IP_OPTIONS, ra, 4)) { | |
146 | zlog_warn("Could not set Router Alert Option on socket fd=%d: errno=%d: %s", | |
147 | fd, errno, safe_strerror(errno)); | |
148 | close(fd); | |
149 | return PIM_SOCK_ERR_RA; | |
150 | } | |
151 | } | |
152 | ||
153 | { | |
154 | int reuse = 1; | |
155 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, | |
156 | (void *) &reuse, sizeof(reuse))) { | |
157 | zlog_warn("Could not set Reuse Address Option on socket fd=%d: errno=%d: %s", | |
158 | fd, errno, safe_strerror(errno)); | |
159 | close(fd); | |
160 | return PIM_SOCK_ERR_REUSE; | |
161 | } | |
162 | } | |
163 | ||
164 | { | |
165 | const int MTTL = 1; | |
166 | int ttl = MTTL; | |
167 | if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, | |
168 | (void *) &ttl, sizeof(ttl))) { | |
169 | zlog_warn("Could not set multicast TTL=%d on socket fd=%d: errno=%d: %s", | |
170 | MTTL, fd, errno, safe_strerror(errno)); | |
171 | close(fd); | |
172 | return PIM_SOCK_ERR_TTL; | |
173 | } | |
174 | } | |
175 | ||
176 | if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, | |
177 | (void *) &loop, sizeof(loop))) { | |
178 | zlog_warn("Could not %s Multicast Loopback Option on socket fd=%d: errno=%d: %s", | |
179 | loop ? "enable" : "disable", | |
180 | fd, errno, safe_strerror(errno)); | |
181 | close(fd); | |
182 | return PIM_SOCK_ERR_LOOP; | |
183 | } | |
184 | ||
185 | if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, | |
186 | (void *) &ifaddr, sizeof(ifaddr))) { | |
187 | zlog_warn("Could not set Outgoing Interface Option on socket fd=%d: errno=%d: %s", | |
188 | fd, errno, safe_strerror(errno)); | |
189 | close(fd); | |
190 | return PIM_SOCK_ERR_IFACE; | |
191 | } | |
192 | ||
193 | { | |
194 | long flags; | |
195 | ||
196 | flags = fcntl(fd, F_GETFL, 0); | |
197 | if (flags < 0) { | |
198 | zlog_warn("Could not get fcntl(F_GETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s", | |
199 | fd, errno, safe_strerror(errno)); | |
200 | close(fd); | |
201 | return PIM_SOCK_ERR_NONBLOCK_GETFL; | |
202 | } | |
203 | ||
204 | if (fcntl(fd, F_SETFL, flags | O_NONBLOCK)) { | |
205 | zlog_warn("Could not set fcntl(F_SETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s", | |
206 | fd, errno, safe_strerror(errno)); | |
207 | close(fd); | |
208 | return PIM_SOCK_ERR_NONBLOCK_SETFL; | |
209 | } | |
210 | } | |
211 | ||
212 | return fd; | |
213 | } | |
214 | ||
215 | int pim_socket_join(int fd, struct in_addr group, | |
b892f1dd | 216 | struct in_addr ifaddr, ifindex_t ifindex) |
12e41d03 DL |
217 | { |
218 | int ret; | |
219 | ||
220 | #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX | |
221 | struct ip_mreqn opt; | |
222 | #else | |
223 | struct ip_mreq opt; | |
224 | #endif | |
225 | ||
226 | opt.imr_multiaddr = group; | |
227 | ||
228 | #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX | |
229 | opt.imr_address = ifaddr; | |
230 | opt.imr_ifindex = ifindex; | |
231 | #else | |
232 | opt.imr_interface = ifaddr; | |
233 | #endif | |
234 | ||
235 | ret = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &opt, sizeof(opt)); | |
236 | if (ret) { | |
237 | char group_str[100]; | |
238 | char ifaddr_str[100]; | |
239 | if (!inet_ntop(AF_INET, &group, group_str , sizeof(group_str))) | |
240 | sprintf(group_str, "<group?>"); | |
241 | if (!inet_ntop(AF_INET, &ifaddr, ifaddr_str , sizeof(ifaddr_str))) | |
242 | sprintf(ifaddr_str, "<ifaddr?>"); | |
243 | ||
244 | zlog_err("Failure socket joining fd=%d group %s on interface address %s: errno=%d: %s", | |
245 | fd, group_str, ifaddr_str, errno, safe_strerror(errno)); | |
246 | return ret; | |
247 | } | |
248 | ||
249 | if (PIM_DEBUG_TRACE) { | |
250 | char group_str[100]; | |
251 | char ifaddr_str[100]; | |
252 | if (!inet_ntop(AF_INET, &group, group_str , sizeof(group_str))) | |
253 | sprintf(group_str, "<group?>"); | |
254 | if (!inet_ntop(AF_INET, &ifaddr, ifaddr_str , sizeof(ifaddr_str))) | |
255 | sprintf(ifaddr_str, "<ifaddr?>"); | |
256 | ||
257 | zlog_debug("Socket fd=%d joined group %s on interface address %s", | |
258 | fd, group_str, ifaddr_str); | |
259 | } | |
260 | ||
261 | return ret; | |
262 | } | |
263 | ||
b892f1dd | 264 | int pim_socket_join_source(int fd, ifindex_t ifindex, |
12e41d03 DL |
265 | struct in_addr group_addr, |
266 | struct in_addr source_addr, | |
267 | const char *ifname) | |
268 | { | |
269 | if (pim_igmp_join_source(fd, ifindex, group_addr, source_addr)) { | |
270 | int e = errno; | |
271 | char group_str[100]; | |
272 | char source_str[100]; | |
273 | pim_inet4_dump("<grp?>", group_addr, group_str, sizeof(group_str)); | |
274 | pim_inet4_dump("<src?>", source_addr, source_str, sizeof(source_str)); | |
275 | zlog_warn("%s: setsockopt(fd=%d) failure for IGMP group %s source %s ifindex %d on interface %s: errno=%d: %s", | |
276 | __PRETTY_FUNCTION__, | |
277 | fd, group_str, source_str, ifindex, ifname, | |
278 | e, safe_strerror(e)); | |
279 | return -1; | |
280 | } | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
285 | int pim_socket_recvfromto(int fd, uint8_t *buf, size_t len, | |
286 | struct sockaddr_in *from, socklen_t *fromlen, | |
287 | struct sockaddr_in *to, socklen_t *tolen, | |
b892f1dd | 288 | ifindex_t *ifindex) |
12e41d03 DL |
289 | { |
290 | struct msghdr msgh; | |
291 | struct cmsghdr *cmsg; | |
292 | struct iovec iov; | |
293 | char cbuf[1000]; | |
294 | int err; | |
295 | ||
296 | /* | |
297 | * IP_PKTINFO / IP_RECVDSTADDR don't yield sin_port. | |
298 | * Use getsockname() to get sin_port. | |
299 | */ | |
300 | if (to) { | |
301 | struct sockaddr_in si; | |
302 | socklen_t si_len = sizeof(si); | |
303 | ||
304 | ((struct sockaddr_in *) to)->sin_family = AF_INET; | |
305 | ||
306 | if (pim_socket_getsockname(fd, (struct sockaddr *) &si, &si_len)) { | |
307 | ((struct sockaddr_in *) to)->sin_port = ntohs(0); | |
308 | ((struct sockaddr_in *) to)->sin_addr.s_addr = ntohl(0); | |
309 | } | |
310 | else { | |
311 | ((struct sockaddr_in *) to)->sin_port = si.sin_port; | |
312 | ((struct sockaddr_in *) to)->sin_addr = si.sin_addr; | |
313 | } | |
314 | ||
315 | if (tolen) | |
316 | *tolen = sizeof(si); | |
317 | } | |
318 | ||
319 | memset(&msgh, 0, sizeof(struct msghdr)); | |
320 | iov.iov_base = buf; | |
321 | iov.iov_len = len; | |
322 | msgh.msg_control = cbuf; | |
323 | msgh.msg_controllen = sizeof(cbuf); | |
324 | msgh.msg_name = from; | |
325 | msgh.msg_namelen = fromlen ? *fromlen : 0; | |
326 | msgh.msg_iov = &iov; | |
327 | msgh.msg_iovlen = 1; | |
328 | msgh.msg_flags = 0; | |
329 | ||
330 | err = recvmsg(fd, &msgh, 0); | |
331 | if (err < 0) | |
332 | return err; | |
333 | ||
334 | if (fromlen) | |
335 | *fromlen = msgh.msg_namelen; | |
336 | ||
337 | for (cmsg = CMSG_FIRSTHDR(&msgh); | |
338 | cmsg != NULL; | |
339 | cmsg = CMSG_NXTHDR(&msgh,cmsg)) { | |
340 | ||
341 | #ifdef HAVE_IP_PKTINFO | |
7ec30636 | 342 | if ((cmsg->cmsg_level == IPPROTO_IP) && (cmsg->cmsg_type == IP_PKTINFO)) { |
12e41d03 DL |
343 | struct in_pktinfo *i = (struct in_pktinfo *) CMSG_DATA(cmsg); |
344 | if (to) | |
345 | ((struct sockaddr_in *) to)->sin_addr = i->ipi_addr; | |
346 | if (tolen) | |
347 | *tolen = sizeof(struct sockaddr_in); | |
348 | if (ifindex) | |
349 | *ifindex = i->ipi_ifindex; | |
350 | ||
351 | if (to && PIM_DEBUG_PACKETS) { | |
352 | char to_str[100]; | |
353 | pim_inet4_dump("<to?>", to->sin_addr, to_str, sizeof(to_str)); | |
354 | zlog_debug("%s: HAVE_IP_PKTINFO to=%s,%d", | |
355 | __PRETTY_FUNCTION__, | |
356 | to_str, ntohs(to->sin_port)); | |
357 | } | |
358 | ||
359 | break; | |
360 | } | |
361 | #endif | |
362 | ||
363 | #ifdef HAVE_IP_RECVDSTADDR | |
364 | if ((cmsg->cmsg_level == IPPROTO_IP) && (cmsg->cmsg_type == IP_RECVDSTADDR)) { | |
365 | struct in_addr *i = (struct in_addr *) CMSG_DATA(cmsg); | |
366 | if (to) | |
367 | ((struct sockaddr_in *) to)->sin_addr = *i; | |
368 | if (tolen) | |
369 | *tolen = sizeof(struct sockaddr_in); | |
370 | ||
371 | if (to && PIM_DEBUG_PACKETS) { | |
372 | char to_str[100]; | |
373 | pim_inet4_dump("<to?>", to->sin_addr, to_str, sizeof(to_str)); | |
374 | zlog_debug("%s: HAVE_IP_RECVDSTADDR to=%s,%d", | |
375 | __PRETTY_FUNCTION__, | |
376 | to_str, ntohs(to->sin_port)); | |
377 | } | |
378 | ||
379 | break; | |
380 | } | |
381 | #endif | |
382 | ||
383 | #if defined(HAVE_IP_RECVIF) && defined(CMSG_IFINDEX) | |
384 | if (cmsg->cmsg_type == IP_RECVIF) | |
385 | if (ifindex) | |
386 | *ifindex = CMSG_IFINDEX(cmsg); | |
387 | #endif | |
388 | ||
389 | } /* for (cmsg) */ | |
390 | ||
391 | return err; /* len */ | |
392 | } | |
393 | ||
394 | int pim_socket_mcastloop_get(int fd) | |
395 | { | |
396 | int loop; | |
397 | socklen_t loop_len = sizeof(loop); | |
398 | ||
399 | if (getsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, | |
400 | &loop, &loop_len)) { | |
401 | int e = errno; | |
402 | zlog_warn("Could not get Multicast Loopback Option on socket fd=%d: errno=%d: %s", | |
403 | fd, errno, safe_strerror(errno)); | |
404 | errno = e; | |
405 | return PIM_SOCK_ERR_LOOP; | |
406 | } | |
407 | ||
408 | return loop; | |
409 | } | |
410 | ||
411 | int pim_socket_getsockname(int fd, struct sockaddr *name, socklen_t *namelen) | |
412 | { | |
413 | if (getsockname(fd, name, namelen)) { | |
414 | int e = errno; | |
415 | zlog_warn("Could not get Socket Name for socket fd=%d: errno=%d: %s", | |
416 | fd, errno, safe_strerror(errno)); | |
417 | errno = e; | |
418 | return PIM_SOCK_ERR_NAME; | |
419 | } | |
420 | ||
421 | return PIM_SOCK_ERR_NONE; | |
422 | } |