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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 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 | */ | |
19 | ||
20 | #include <zebra.h> | |
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 | ||
31 | #include "log.h" | |
32 | #include "privs.h" | |
33 | #include "if.h" | |
34 | #include "vrf.h" | |
35 | #include "sockopt.h" | |
36 | #include "lib_errors.h" | |
37 | ||
38 | #include "pimd.h" | |
39 | #include "pim_mroute.h" | |
40 | #include "pim_sock.h" | |
41 | #include "pim_str.h" | |
42 | ||
43 | /* GLOBAL VARS */ | |
44 | ||
45 | int pim_socket_raw(int protocol) | |
46 | { | |
47 | int fd; | |
48 | ||
49 | frr_with_privs(&pimd_privs) { | |
50 | ||
51 | fd = socket(AF_INET, SOCK_RAW, protocol); | |
52 | ||
53 | } | |
54 | ||
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; | |
62 | } | |
63 | ||
64 | void pim_socket_ip_hdr(int fd) | |
65 | { | |
66 | const int on = 1; | |
67 | ||
68 | frr_with_privs(&pimd_privs) { | |
69 | ||
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)); | |
73 | ||
74 | } | |
75 | } | |
76 | ||
77 | /* | |
78 | * Given a socket and a interface, | |
79 | * Bind that socket to that interface | |
80 | */ | |
81 | int pim_socket_bind(int fd, struct interface *ifp) | |
82 | { | |
83 | int ret = 0; | |
84 | #ifdef SO_BINDTODEVICE | |
85 | ||
86 | frr_with_privs(&pimd_privs) { | |
87 | ||
88 | ret = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, ifp->name, | |
89 | strlen(ifp->name)); | |
90 | ||
91 | } | |
92 | ||
93 | #endif | |
94 | return ret; | |
95 | } | |
96 | ||
97 | int pim_socket_mcast(int protocol, struct in_addr ifaddr, struct interface *ifp, | |
98 | uint8_t loop) | |
99 | { | |
100 | int rcvbuf = 1024 * 1024 * 8; | |
101 | #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX | |
102 | struct ip_mreqn mreq; | |
103 | #else | |
104 | struct ip_mreq mreq; | |
105 | #endif | |
106 | int fd; | |
107 | ||
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 | } | |
114 | ||
115 | #ifdef SO_BINDTODEVICE | |
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 | } | |
127 | } | |
128 | #else | |
129 | /* XXX: use IP_PKTINFO / IP_RECVIF to emulate behaviour? Or change to | |
130 | * only use 1 socket for all interfaces? */ | |
131 | #endif | |
132 | ||
133 | /* Needed to obtain destination address from recvmsg() */ | |
134 | { | |
135 | #if defined(HAVE_IP_PKTINFO) | |
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 | } | |
143 | #elif defined(HAVE_IP_RECVDSTADDR) | |
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 | } | |
152 | #else | |
153 | flog_err( | |
154 | EC_LIB_DEVELOPMENT, | |
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; | |
159 | #endif | |
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)); | |
215 | #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX | |
216 | mreq.imr_ifindex = ifp->ifindex; | |
217 | #else | |
218 | /* | |
219 | * I am not sure what to do here yet for *BSD | |
220 | */ | |
221 | // mreq.imr_interface = ifindex; | |
222 | #endif | |
223 | ||
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 | /* Set Tx socket DSCP byte */ | |
259 | if (setsockopt_ipv4_tos(fd, IPTOS_PREC_INTERNETCONTROL)) { | |
260 | zlog_warn("can't set sockopt IP_TOS to PIM/IGMP socket %d: %s", | |
261 | fd, safe_strerror(errno)); | |
262 | } | |
263 | ||
264 | return fd; | |
265 | } | |
266 | ||
267 | int pim_socket_join(int fd, struct in_addr group, struct in_addr ifaddr, | |
268 | ifindex_t ifindex) | |
269 | { | |
270 | int ret; | |
271 | ||
272 | #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX | |
273 | struct ip_mreqn opt; | |
274 | #else | |
275 | struct ip_mreq opt; | |
276 | #endif | |
277 | ||
278 | opt.imr_multiaddr = group; | |
279 | ||
280 | #ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX | |
281 | opt.imr_address = ifaddr; | |
282 | opt.imr_ifindex = ifindex; | |
283 | #else | |
284 | opt.imr_interface = ifaddr; | |
285 | #endif | |
286 | ||
287 | ret = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &opt, sizeof(opt)); | |
288 | if (ret) { | |
289 | char group_str[INET_ADDRSTRLEN]; | |
290 | char ifaddr_str[INET_ADDRSTRLEN]; | |
291 | if (!inet_ntop(AF_INET, &group, group_str, sizeof(group_str))) | |
292 | sprintf(group_str, "<group?>"); | |
293 | if (!inet_ntop(AF_INET, &ifaddr, ifaddr_str, | |
294 | sizeof(ifaddr_str))) | |
295 | sprintf(ifaddr_str, "<ifaddr?>"); | |
296 | ||
297 | flog_err( | |
298 | EC_LIB_SOCKET, | |
299 | "Failure socket joining fd=%d group %s on interface address %s: errno=%d: %s", | |
300 | fd, group_str, ifaddr_str, errno, safe_strerror(errno)); | |
301 | return ret; | |
302 | } | |
303 | ||
304 | if (PIM_DEBUG_TRACE) { | |
305 | char group_str[INET_ADDRSTRLEN]; | |
306 | char ifaddr_str[INET_ADDRSTRLEN]; | |
307 | if (!inet_ntop(AF_INET, &group, group_str, sizeof(group_str))) | |
308 | sprintf(group_str, "<group?>"); | |
309 | if (!inet_ntop(AF_INET, &ifaddr, ifaddr_str, | |
310 | sizeof(ifaddr_str))) | |
311 | sprintf(ifaddr_str, "<ifaddr?>"); | |
312 | ||
313 | zlog_debug( | |
314 | "Socket fd=%d joined group %s on interface address %s", | |
315 | fd, group_str, ifaddr_str); | |
316 | } | |
317 | ||
318 | return ret; | |
319 | } | |
320 | ||
321 | int pim_socket_recvfromto(int fd, uint8_t *buf, size_t len, | |
322 | struct sockaddr_in *from, socklen_t *fromlen, | |
323 | struct sockaddr_in *to, socklen_t *tolen, | |
324 | ifindex_t *ifindex) | |
325 | { | |
326 | struct msghdr msgh; | |
327 | struct cmsghdr *cmsg; | |
328 | struct iovec iov; | |
329 | char cbuf[1000]; | |
330 | int err; | |
331 | ||
332 | /* | |
333 | * IP_PKTINFO / IP_RECVDSTADDR don't yield sin_port. | |
334 | * Use getsockname() to get sin_port. | |
335 | */ | |
336 | if (to) { | |
337 | struct sockaddr_in si; | |
338 | socklen_t si_len = sizeof(si); | |
339 | ||
340 | memset(&si, 0, sizeof(si)); | |
341 | to->sin_family = AF_INET; | |
342 | ||
343 | pim_socket_getsockname(fd, (struct sockaddr *)&si, &si_len); | |
344 | ||
345 | to->sin_port = si.sin_port; | |
346 | to->sin_addr = si.sin_addr; | |
347 | ||
348 | if (tolen) | |
349 | *tolen = sizeof(si); | |
350 | } | |
351 | ||
352 | memset(&msgh, 0, sizeof(struct msghdr)); | |
353 | iov.iov_base = buf; | |
354 | iov.iov_len = len; | |
355 | msgh.msg_control = cbuf; | |
356 | msgh.msg_controllen = sizeof(cbuf); | |
357 | msgh.msg_name = from; | |
358 | msgh.msg_namelen = fromlen ? *fromlen : 0; | |
359 | msgh.msg_iov = &iov; | |
360 | msgh.msg_iovlen = 1; | |
361 | msgh.msg_flags = 0; | |
362 | ||
363 | err = recvmsg(fd, &msgh, 0); | |
364 | if (err < 0) | |
365 | return err; | |
366 | ||
367 | if (fromlen) | |
368 | *fromlen = msgh.msg_namelen; | |
369 | ||
370 | for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL; | |
371 | cmsg = CMSG_NXTHDR(&msgh, cmsg)) { | |
372 | ||
373 | #ifdef HAVE_IP_PKTINFO | |
374 | if ((cmsg->cmsg_level == IPPROTO_IP) | |
375 | && (cmsg->cmsg_type == IP_PKTINFO)) { | |
376 | struct in_pktinfo *i = | |
377 | (struct in_pktinfo *)CMSG_DATA(cmsg); | |
378 | if (to) | |
379 | ((struct sockaddr_in *)to)->sin_addr = | |
380 | i->ipi_addr; | |
381 | if (tolen) | |
382 | *tolen = sizeof(struct sockaddr_in); | |
383 | if (ifindex) | |
384 | *ifindex = i->ipi_ifindex; | |
385 | ||
386 | break; | |
387 | } | |
388 | #endif | |
389 | ||
390 | #ifdef HAVE_IP_RECVDSTADDR | |
391 | if ((cmsg->cmsg_level == IPPROTO_IP) | |
392 | && (cmsg->cmsg_type == IP_RECVDSTADDR)) { | |
393 | struct in_addr *i = (struct in_addr *)CMSG_DATA(cmsg); | |
394 | if (to) | |
395 | ((struct sockaddr_in *)to)->sin_addr = *i; | |
396 | if (tolen) | |
397 | *tolen = sizeof(struct sockaddr_in); | |
398 | ||
399 | break; | |
400 | } | |
401 | #endif | |
402 | ||
403 | #if defined(HAVE_IP_RECVIF) && defined(CMSG_IFINDEX) | |
404 | if (cmsg->cmsg_type == IP_RECVIF) | |
405 | if (ifindex) | |
406 | *ifindex = CMSG_IFINDEX(cmsg); | |
407 | #endif | |
408 | ||
409 | } /* for (cmsg) */ | |
410 | ||
411 | return err; /* len */ | |
412 | } | |
413 | ||
414 | int pim_socket_mcastloop_get(int fd) | |
415 | { | |
416 | int loop; | |
417 | socklen_t loop_len = sizeof(loop); | |
418 | ||
419 | if (getsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, &loop_len)) { | |
420 | int e = errno; | |
421 | zlog_warn( | |
422 | "Could not get Multicast Loopback Option on socket fd=%d: errno=%d: %s", | |
423 | fd, errno, safe_strerror(errno)); | |
424 | errno = e; | |
425 | return PIM_SOCK_ERR_LOOP; | |
426 | } | |
427 | ||
428 | return loop; | |
429 | } | |
430 | ||
431 | int pim_socket_getsockname(int fd, struct sockaddr *name, socklen_t *namelen) | |
432 | { | |
433 | if (getsockname(fd, name, namelen)) { | |
434 | int e = errno; | |
435 | zlog_warn( | |
436 | "Could not get Socket Name for socket fd=%d: errno=%d: %s", | |
437 | fd, errno, safe_strerror(errno)); | |
438 | errno = e; | |
439 | return PIM_SOCK_ERR_NAME; | |
440 | } | |
441 | ||
442 | return PIM_SOCK_ERR_NONE; | |
443 | } |