]>
Commit | Line | Data |
---|---|---|
12e41d03 | 1 | /* |
896014f4 DL |
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 along | |
16 | * with this program; see the file COPYING; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | */ | |
12e41d03 | 19 | |
7a2fbbf0 | 20 | #include <zebra.h> |
12e41d03 DL |
21 | |
22 | #include <sys/types.h> | |
23 | #include <sys/socket.h> | |
24 | #include <netinet/in.h> | |
25 | #include <netinet/igmp.h> | |
26 | #include <arpa/inet.h> | |
27 | #include <unistd.h> | |
28 | #include <netdb.h> | |
29 | #include <errno.h> | |
30 | ||
12e41d03 DL |
31 | #include "log.h" |
32 | #include "privs.h" | |
9df99407 | 33 | #include "if.h" |
61ea3951 | 34 | #include "vrf.h" |
c5bdb09f | 35 | #include "sockopt.h" |
3613d898 | 36 | #include "lib_errors.h" |
12e41d03 DL |
37 | |
38 | #include "pimd.h" | |
9df99407 | 39 | #include "pim_mroute.h" |
12e41d03 DL |
40 | #include "pim_sock.h" |
41 | #include "pim_str.h" | |
12e41d03 DL |
42 | |
43 | /* GLOBAL VARS */ | |
12e41d03 | 44 | |
d62a17ae | 45 | int pim_socket_raw(int protocol) |
12e41d03 | 46 | { |
d62a17ae | 47 | int fd; |
12e41d03 | 48 | |
0cf6db21 | 49 | frr_with_privs(&pimd_privs) { |
12e41d03 | 50 | |
01b9e3fd | 51 | fd = socket(AF_INET, SOCK_RAW, protocol); |
12e41d03 | 52 | |
01b9e3fd | 53 | } |
12e41d03 | 54 | |
d62a17ae | 55 | if (fd < 0) { |
56 | zlog_warn("Could not create raw socket: errno=%d: %s", errno, | |
57 | safe_strerror(errno)); | |
58 | return PIM_SOCK_ERR_SOCKET; | |
59 | } | |
60 | ||
61 | return fd; | |
12e41d03 DL |
62 | } |
63 | ||
e691f179 | 64 | void pim_socket_ip_hdr(int fd) |
31c680fc | 65 | { |
d62a17ae | 66 | const int on = 1; |
31c680fc | 67 | |
0cf6db21 | 68 | frr_with_privs(&pimd_privs) { |
31c680fc | 69 | |
01b9e3fd DL |
70 | if (setsockopt(fd, IPPROTO_IP, IP_HDRINCL, &on, sizeof(on))) |
71 | zlog_err("%s: Could not turn on IP_HDRINCL option: %s", | |
72 | __PRETTY_FUNCTION__, safe_strerror(errno)); | |
31c680fc | 73 | |
01b9e3fd | 74 | } |
31c680fc DS |
75 | } |
76 | ||
728cd663 DS |
77 | /* |
78 | * Given a socket and a interface, | |
79 | * Bind that socket to that interface | |
80 | */ | |
d62a17ae | 81 | int pim_socket_bind(int fd, struct interface *ifp) |
728cd663 | 82 | { |
d62a17ae | 83 | int ret = 0; |
f15bf553 | 84 | #ifdef SO_BINDTODEVICE |
728cd663 | 85 | |
0cf6db21 | 86 | frr_with_privs(&pimd_privs) { |
728cd663 | 87 | |
01b9e3fd DL |
88 | ret = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, ifp->name, |
89 | strlen(ifp->name)); | |
728cd663 | 90 | |
01b9e3fd | 91 | } |
728cd663 | 92 | |
f15bf553 | 93 | #endif |
d62a17ae | 94 | return ret; |
728cd663 DS |
95 | } |
96 | ||
d62a17ae | 97 | int pim_socket_mcast(int protocol, struct in_addr ifaddr, struct interface *ifp, |
d7c0a89a | 98 | uint8_t loop) |
12e41d03 | 99 | { |
d62a17ae | 100 | int rcvbuf = 1024 * 1024 * 8; |
c2403b25 | 101 | #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX |
d62a17ae | 102 | struct ip_mreqn mreq; |
c2403b25 | 103 | #else |
d62a17ae | 104 | struct ip_mreq mreq; |
c2403b25 | 105 | #endif |
d62a17ae | 106 | int fd; |
12e41d03 | 107 | |
d62a17ae | 108 | fd = pim_socket_raw(protocol); |
109 | if (fd < 0) { | |
110 | zlog_warn("Could not create multicast socket: errno=%d: %s", | |
111 | errno, safe_strerror(errno)); | |
112 | return PIM_SOCK_ERR_SOCKET; | |
113 | } | |
12e41d03 | 114 | |
6bcd6029 | 115 | #ifdef SO_BINDTODEVICE |
d62a17ae | 116 | if (protocol == IPPROTO_PIM) { |
117 | int ret; | |
118 | ||
119 | ret = pim_socket_bind(fd, ifp); | |
120 | if (ret) { | |
121 | close(fd); | |
122 | zlog_warn( | |
123 | "Could not set fd: %d for interface: %s to device", | |
124 | fd, ifp->name); | |
125 | return PIM_SOCK_ERR_BIND; | |
126 | } | |
61ea3951 | 127 | } |
6bcd6029 | 128 | #else |
d62a17ae | 129 | /* XXX: use IP_PKTINFO / IP_RECVIF to emulate behaviour? Or change to |
130 | * only use 1 socket for all interfaces? */ | |
6bcd6029 | 131 | #endif |
61ea3951 | 132 | |
d62a17ae | 133 | /* Needed to obtain destination address from recvmsg() */ |
134 | { | |
12e41d03 | 135 | #if defined(HAVE_IP_PKTINFO) |
d62a17ae | 136 | /* Linux and Solaris IP_PKTINFO */ |
137 | int opt = 1; | |
138 | if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &opt, sizeof(opt))) { | |
139 | zlog_warn( | |
140 | "Could not set IP_PKTINFO on socket fd=%d: errno=%d: %s", | |
141 | fd, errno, safe_strerror(errno)); | |
142 | } | |
12e41d03 | 143 | #elif defined(HAVE_IP_RECVDSTADDR) |
d62a17ae | 144 | /* BSD IP_RECVDSTADDR */ |
145 | int opt = 1; | |
146 | if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &opt, | |
147 | sizeof(opt))) { | |
148 | zlog_warn( | |
149 | "Could not set IP_RECVDSTADDR on socket fd=%d: errno=%d: %s", | |
150 | fd, errno, safe_strerror(errno)); | |
151 | } | |
12e41d03 | 152 | #else |
af4c2728 | 153 | flog_err( |
450971aa | 154 | EC_LIB_DEVELOPMENT, |
d62a17ae | 155 | "%s %s: Missing IP_PKTINFO and IP_RECVDSTADDR: unable to get dst addr from recvmsg()", |
156 | __FILE__, __PRETTY_FUNCTION__); | |
157 | close(fd); | |
158 | return PIM_SOCK_ERR_DSTADDR; | |
12e41d03 | 159 | #endif |
d62a17ae | 160 | } |
161 | ||
162 | ||
163 | /* Set router alert (RFC 2113) for all IGMP messages (RFC 3376 4. | |
164 | * Message Formats)*/ | |
165 | if (protocol == IPPROTO_IGMP) { | |
166 | uint8_t ra[4]; | |
167 | ra[0] = 148; | |
168 | ra[1] = 4; | |
169 | ra[2] = 0; | |
170 | ra[3] = 0; | |
171 | if (setsockopt(fd, IPPROTO_IP, IP_OPTIONS, ra, 4)) { | |
172 | zlog_warn( | |
173 | "Could not set Router Alert Option on socket fd=%d: errno=%d: %s", | |
174 | fd, errno, safe_strerror(errno)); | |
175 | close(fd); | |
176 | return PIM_SOCK_ERR_RA; | |
177 | } | |
178 | } | |
179 | ||
180 | { | |
181 | int reuse = 1; | |
182 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *)&reuse, | |
183 | sizeof(reuse))) { | |
184 | zlog_warn( | |
185 | "Could not set Reuse Address Option on socket fd=%d: errno=%d: %s", | |
186 | fd, errno, safe_strerror(errno)); | |
187 | close(fd); | |
188 | return PIM_SOCK_ERR_REUSE; | |
189 | } | |
190 | } | |
191 | ||
192 | { | |
193 | const int MTTL = 1; | |
194 | int ttl = MTTL; | |
195 | if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, (void *)&ttl, | |
196 | sizeof(ttl))) { | |
197 | zlog_warn( | |
198 | "Could not set multicast TTL=%d on socket fd=%d: errno=%d: %s", | |
199 | MTTL, fd, errno, safe_strerror(errno)); | |
200 | close(fd); | |
201 | return PIM_SOCK_ERR_TTL; | |
202 | } | |
203 | } | |
204 | ||
205 | if (setsockopt_ipv4_multicast_loop(fd, loop)) { | |
206 | zlog_warn( | |
207 | "Could not %s Multicast Loopback Option on socket fd=%d: errno=%d: %s", | |
208 | loop ? "enable" : "disable", fd, errno, | |
209 | safe_strerror(errno)); | |
210 | close(fd); | |
211 | return PIM_SOCK_ERR_LOOP; | |
212 | } | |
213 | ||
214 | memset(&mreq, 0, sizeof(mreq)); | |
c2403b25 | 215 | #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX |
d62a17ae | 216 | mreq.imr_ifindex = ifp->ifindex; |
c2403b25 | 217 | #else |
d62a17ae | 218 | /* |
219 | * I am not sure what to do here yet for *BSD | |
220 | */ | |
221 | // mreq.imr_interface = ifindex; | |
c2403b25 DS |
222 | #endif |
223 | ||
d62a17ae | 224 | if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, (void *)&mreq, |
225 | sizeof(mreq))) { | |
226 | zlog_warn( | |
227 | "Could not set Outgoing Interface Option on socket fd=%d: errno=%d: %s", | |
228 | fd, errno, safe_strerror(errno)); | |
229 | close(fd); | |
230 | return PIM_SOCK_ERR_IFACE; | |
231 | } | |
232 | ||
233 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, sizeof(rcvbuf))) | |
234 | zlog_warn("%s: Failure to set buffer size to %d", | |
235 | __PRETTY_FUNCTION__, rcvbuf); | |
236 | ||
237 | { | |
238 | long flags; | |
239 | ||
240 | flags = fcntl(fd, F_GETFL, 0); | |
241 | if (flags < 0) { | |
242 | zlog_warn( | |
243 | "Could not get fcntl(F_GETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s", | |
244 | fd, errno, safe_strerror(errno)); | |
245 | close(fd); | |
246 | return PIM_SOCK_ERR_NONBLOCK_GETFL; | |
247 | } | |
248 | ||
249 | if (fcntl(fd, F_SETFL, flags | O_NONBLOCK)) { | |
250 | zlog_warn( | |
251 | "Could not set fcntl(F_SETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s", | |
252 | fd, errno, safe_strerror(errno)); | |
253 | close(fd); | |
254 | return PIM_SOCK_ERR_NONBLOCK_SETFL; | |
255 | } | |
256 | } | |
257 | ||
258 | return fd; | |
12e41d03 DL |
259 | } |
260 | ||
d62a17ae | 261 | int pim_socket_join(int fd, struct in_addr group, struct in_addr ifaddr, |
262 | ifindex_t ifindex) | |
12e41d03 | 263 | { |
d62a17ae | 264 | int ret; |
12e41d03 DL |
265 | |
266 | #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX | |
d62a17ae | 267 | struct ip_mreqn opt; |
12e41d03 | 268 | #else |
d62a17ae | 269 | struct ip_mreq opt; |
12e41d03 DL |
270 | #endif |
271 | ||
d62a17ae | 272 | opt.imr_multiaddr = group; |
12e41d03 DL |
273 | |
274 | #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX | |
d62a17ae | 275 | opt.imr_address = ifaddr; |
276 | opt.imr_ifindex = ifindex; | |
12e41d03 | 277 | #else |
d62a17ae | 278 | opt.imr_interface = ifaddr; |
12e41d03 DL |
279 | #endif |
280 | ||
d62a17ae | 281 | ret = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &opt, sizeof(opt)); |
282 | if (ret) { | |
283 | char group_str[INET_ADDRSTRLEN]; | |
284 | char ifaddr_str[INET_ADDRSTRLEN]; | |
285 | if (!inet_ntop(AF_INET, &group, group_str, sizeof(group_str))) | |
286 | sprintf(group_str, "<group?>"); | |
287 | if (!inet_ntop(AF_INET, &ifaddr, ifaddr_str, | |
288 | sizeof(ifaddr_str))) | |
289 | sprintf(ifaddr_str, "<ifaddr?>"); | |
290 | ||
af4c2728 | 291 | flog_err( |
450971aa | 292 | EC_LIB_SOCKET, |
d62a17ae | 293 | "Failure socket joining fd=%d group %s on interface address %s: errno=%d: %s", |
294 | fd, group_str, ifaddr_str, errno, safe_strerror(errno)); | |
295 | return ret; | |
296 | } | |
297 | ||
298 | if (PIM_DEBUG_TRACE) { | |
299 | char group_str[INET_ADDRSTRLEN]; | |
300 | char ifaddr_str[INET_ADDRSTRLEN]; | |
301 | if (!inet_ntop(AF_INET, &group, group_str, sizeof(group_str))) | |
302 | sprintf(group_str, "<group?>"); | |
303 | if (!inet_ntop(AF_INET, &ifaddr, ifaddr_str, | |
304 | sizeof(ifaddr_str))) | |
305 | sprintf(ifaddr_str, "<ifaddr?>"); | |
306 | ||
307 | zlog_debug( | |
308 | "Socket fd=%d joined group %s on interface address %s", | |
309 | fd, group_str, ifaddr_str); | |
310 | } | |
311 | ||
312 | return ret; | |
12e41d03 DL |
313 | } |
314 | ||
12e41d03 DL |
315 | int pim_socket_recvfromto(int fd, uint8_t *buf, size_t len, |
316 | struct sockaddr_in *from, socklen_t *fromlen, | |
317 | struct sockaddr_in *to, socklen_t *tolen, | |
b892f1dd | 318 | ifindex_t *ifindex) |
12e41d03 | 319 | { |
d62a17ae | 320 | struct msghdr msgh; |
321 | struct cmsghdr *cmsg; | |
322 | struct iovec iov; | |
323 | char cbuf[1000]; | |
324 | int err; | |
325 | ||
326 | /* | |
327 | * IP_PKTINFO / IP_RECVDSTADDR don't yield sin_port. | |
328 | * Use getsockname() to get sin_port. | |
329 | */ | |
330 | if (to) { | |
331 | struct sockaddr_in si; | |
332 | socklen_t si_len = sizeof(si); | |
333 | ||
334 | memset(&si, 0, sizeof(si)); | |
335 | to->sin_family = AF_INET; | |
336 | ||
337 | pim_socket_getsockname(fd, (struct sockaddr *)&si, &si_len); | |
338 | ||
339 | to->sin_port = si.sin_port; | |
340 | to->sin_addr = si.sin_addr; | |
341 | ||
342 | if (tolen) | |
343 | *tolen = sizeof(si); | |
344 | } | |
345 | ||
346 | memset(&msgh, 0, sizeof(struct msghdr)); | |
347 | iov.iov_base = buf; | |
348 | iov.iov_len = len; | |
349 | msgh.msg_control = cbuf; | |
350 | msgh.msg_controllen = sizeof(cbuf); | |
351 | msgh.msg_name = from; | |
352 | msgh.msg_namelen = fromlen ? *fromlen : 0; | |
353 | msgh.msg_iov = &iov; | |
354 | msgh.msg_iovlen = 1; | |
355 | msgh.msg_flags = 0; | |
356 | ||
357 | err = recvmsg(fd, &msgh, 0); | |
358 | if (err < 0) | |
359 | return err; | |
360 | ||
361 | if (fromlen) | |
362 | *fromlen = msgh.msg_namelen; | |
363 | ||
364 | for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL; | |
365 | cmsg = CMSG_NXTHDR(&msgh, cmsg)) { | |
12e41d03 DL |
366 | |
367 | #ifdef HAVE_IP_PKTINFO | |
d62a17ae | 368 | if ((cmsg->cmsg_level == IPPROTO_IP) |
369 | && (cmsg->cmsg_type == IP_PKTINFO)) { | |
370 | struct in_pktinfo *i = | |
371 | (struct in_pktinfo *)CMSG_DATA(cmsg); | |
372 | if (to) | |
373 | ((struct sockaddr_in *)to)->sin_addr = | |
374 | i->ipi_addr; | |
375 | if (tolen) | |
376 | *tolen = sizeof(struct sockaddr_in); | |
377 | if (ifindex) | |
378 | *ifindex = i->ipi_ifindex; | |
379 | ||
380 | break; | |
381 | } | |
12e41d03 DL |
382 | #endif |
383 | ||
384 | #ifdef HAVE_IP_RECVDSTADDR | |
d62a17ae | 385 | if ((cmsg->cmsg_level == IPPROTO_IP) |
386 | && (cmsg->cmsg_type == IP_RECVDSTADDR)) { | |
387 | struct in_addr *i = (struct in_addr *)CMSG_DATA(cmsg); | |
388 | if (to) | |
389 | ((struct sockaddr_in *)to)->sin_addr = *i; | |
390 | if (tolen) | |
391 | *tolen = sizeof(struct sockaddr_in); | |
392 | ||
393 | break; | |
394 | } | |
12e41d03 DL |
395 | #endif |
396 | ||
397 | #if defined(HAVE_IP_RECVIF) && defined(CMSG_IFINDEX) | |
d62a17ae | 398 | if (cmsg->cmsg_type == IP_RECVIF) |
399 | if (ifindex) | |
400 | *ifindex = CMSG_IFINDEX(cmsg); | |
12e41d03 DL |
401 | #endif |
402 | ||
d62a17ae | 403 | } /* for (cmsg) */ |
12e41d03 | 404 | |
d62a17ae | 405 | return err; /* len */ |
12e41d03 DL |
406 | } |
407 | ||
408 | int pim_socket_mcastloop_get(int fd) | |
409 | { | |
d62a17ae | 410 | int loop; |
411 | socklen_t loop_len = sizeof(loop); | |
412 | ||
413 | if (getsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, &loop_len)) { | |
414 | int e = errno; | |
415 | zlog_warn( | |
416 | "Could not get Multicast Loopback Option on socket fd=%d: errno=%d: %s", | |
417 | fd, errno, safe_strerror(errno)); | |
418 | errno = e; | |
419 | return PIM_SOCK_ERR_LOOP; | |
420 | } | |
421 | ||
422 | return loop; | |
12e41d03 DL |
423 | } |
424 | ||
425 | int pim_socket_getsockname(int fd, struct sockaddr *name, socklen_t *namelen) | |
426 | { | |
d62a17ae | 427 | if (getsockname(fd, name, namelen)) { |
428 | int e = errno; | |
429 | zlog_warn( | |
430 | "Could not get Socket Name for socket fd=%d: errno=%d: %s", | |
431 | fd, errno, safe_strerror(errno)); | |
432 | errno = e; | |
433 | return PIM_SOCK_ERR_NAME; | |
434 | } | |
435 | ||
436 | return PIM_SOCK_ERR_NONE; | |
12e41d03 | 437 | } |