1 /* $KAME: mld6.c,v 1.15 2003/04/02 11:29:54 suz Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (C) 1998 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include <sys/cdefs.h>
35 #include <sys/param.h>
36 #include <sys/uio.h>
37 #include <sys/socket.h>
38 #include <sys/types.h>
39 #include <sys/time.h>
40 #include <ifaddrs.h>
41 #include <unistd.h>
42 #include <signal.h>
43
44 #include <net/if.h>
45
46 #include <netinet/in.h>
47 #include <netinet/ip6.h>
48 #include <netinet/icmp6.h>
49
50 #include <arpa/inet.h>
51
52 #include <stdlib.h>
53 #include <stdio.h>
54 #include <string.h>
55 #include <err.h>
56
57 /* portability with older KAME headers */
58 #ifndef MLD_LISTENER_QUERY
59 #define MLD_LISTENER_QUERY MLD6_LISTENER_QUERY
60 #define MLD_LISTENER_REPORT MLD6_LISTENER_REPORT
61 #define MLD_LISTENER_DONE MLD6_LISTENER_DONE
62 #define MLD_MTRACE_RESP MLD6_MTRACE_RESP
63 #define MLD_MTRACE MLD6_MTRACE
64 #define mld_hdr mld6_hdr
65 #define mld_type mld6_type
66 #define mld_code mld6_code
67 #define mld_cksum mld6_cksum
68 #define mld_maxdelay mld6_maxdelay
69 #define mld_reserved mld6_reserved
70 #define mld_addr mld6_addr
71 #endif
72 #ifndef IP6OPT_ROUTER_ALERT
73 #define IP6OPT_ROUTER_ALERT IP6OPT_RTALERT
74 #endif
75
76 struct msghdr m;
77 struct sockaddr_in6 dst;
78 struct mld_hdr mldh;
79 struct in6_addr maddr = IN6ADDR_ANY_INIT, any = IN6ADDR_ANY_INIT;
80 struct ipv6_mreq mreq;
81 u_short ifindex;
82 int s;
83
84 #define QUERY_RESPONSE_INTERVAL 10000
85
86 void make_msg(int index, struct in6_addr *addr, u_int type, struct in6_addr *qaddr);
87 void usage(void);
88 void dump(int);
89 void quit(int);
90
91 int
main(int argc,char * argv[])92 main(int argc, char *argv[])
93 {
94 int i;
95 struct icmp6_filter filt;
96 u_int hlim = 1;
97 fd_set fdset;
98 struct itimerval itimer;
99 u_int type;
100 int ch;
101 struct in6_addr *qaddr = &maddr;
102
103 type = MLD_LISTENER_QUERY;
104 while ((ch = getopt(argc, argv, "dgr")) != -1) {
105 switch (ch) {
106 case 'd':
107 if (type != MLD_LISTENER_QUERY) {
108 printf("Can not specify -d with -r\n");
109 return 1;
110 }
111 type = MLD_LISTENER_DONE;
112 break;
113 case 'g':
114 qaddr = &any;
115 break;
116 case 'r':
117 if (type != MLD_LISTENER_QUERY) {
118 printf("Can not specify -r with -d\n");
119 return 1;
120 }
121 type = MLD_LISTENER_REPORT;
122 break;
123 default:
124 usage();
125 /*NOTREACHED*/
126 }
127 }
128
129 argv += optind;
130 argc -= optind;
131
132 if (argc != 1 && argc != 2)
133 usage();
134
135 ifindex = (u_short)if_nametoindex(argv[0]);
136 if (ifindex == 0)
137 usage();
138 if (argc == 2 && inet_pton(AF_INET6, argv[1], &maddr) != 1)
139 usage();
140 if (type != MLD_LISTENER_QUERY && qaddr != &maddr) {
141 printf("Can not specify -g with -d or -r\n");
142 return 1;
143 }
144
145 if ((s = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0)
146 err(1, "socket");
147
148 if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hlim,
149 sizeof(hlim)) == -1)
150 err(1, "setsockopt(IPV6_MULTICAST_HOPS)");
151
152 if (IN6_IS_ADDR_UNSPECIFIED(&maddr)) {
153 if (inet_pton(AF_INET6, "ff02::1", &maddr) != 1)
154 errx(1, "inet_pton failed");
155 }
156
157 mreq.ipv6mr_multiaddr = maddr;
158 mreq.ipv6mr_interface = ifindex;
159 if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
160 sizeof(mreq)) == -1)
161 err(1, "setsockopt(IPV6_JOIN_GROUP)");
162
163 ICMP6_FILTER_SETBLOCKALL(&filt);
164 ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_QUERY, &filt);
165 ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REPORT, &filt);
166 ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REDUCTION, &filt);
167 if (setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
168 sizeof(filt)) < 0)
169 err(1, "setsockopt(ICMP6_FILTER)");
170
171 make_msg(ifindex, &maddr, type, qaddr);
172
173 if (sendmsg(s, &m, 0) < 0)
174 err(1, "sendmsg");
175
176 itimer.it_value.tv_sec = QUERY_RESPONSE_INTERVAL / 1000;
177 itimer.it_interval.tv_sec = 0;
178 itimer.it_interval.tv_usec = 0;
179 itimer.it_value.tv_usec = 0;
180
181 (void)signal(SIGALRM, quit);
182 (void)setitimer(ITIMER_REAL, &itimer, NULL);
183
184 FD_ZERO(&fdset);
185 if (s >= FD_SETSIZE)
186 errx(1, "descriptor too big");
187 for (;;) {
188 FD_SET(s, &fdset);
189 if ((i = select(s + 1, &fdset, NULL, NULL, NULL)) < 0)
190 perror("select");
191 if (i == 0)
192 continue;
193 else
194 dump(s);
195 }
196 }
197
198 void
make_msg(int index,struct in6_addr * addr,u_int type,struct in6_addr * qaddr)199 make_msg(int index, struct in6_addr *addr, u_int type, struct in6_addr *qaddr)
200 {
201 static struct iovec iov[2];
202 static u_char *cmsgbuf;
203 int cmsglen, hbhlen = 0;
204 void *hbhbuf = NULL, *optp = NULL;
205 int currentlen;
206 struct in6_pktinfo *pi;
207 struct cmsghdr *cmsgp;
208 u_short rtalert_code = htons(IP6OPT_RTALERT_MLD);
209 struct ifaddrs *ifa, *ifap;
210 struct in6_addr src;
211
212 dst.sin6_len = sizeof(dst);
213 dst.sin6_family = AF_INET6;
214 dst.sin6_addr = *addr;
215 m.msg_name = (caddr_t)&dst;
216 m.msg_namelen = dst.sin6_len;
217 iov[0].iov_base = (caddr_t)&mldh;
218 iov[0].iov_len = sizeof(mldh);
219 m.msg_iov = iov;
220 m.msg_iovlen = 1;
221
222 bzero(&mldh, sizeof(mldh));
223 mldh.mld_type = type & 0xff;
224 mldh.mld_maxdelay = htons(QUERY_RESPONSE_INTERVAL);
225 mldh.mld_addr = *qaddr;
226
227 /* MLD packet should be advertised from linklocal address */
228 getifaddrs(&ifa);
229 for (ifap = ifa; ifap; ifap = ifap->ifa_next) {
230 if (index != if_nametoindex(ifap->ifa_name))
231 continue;
232
233 if (ifap->ifa_addr->sa_family != AF_INET6)
234 continue;
235 if (!IN6_IS_ADDR_LINKLOCAL(&((struct sockaddr_in6 *)
236 ifap->ifa_addr)->sin6_addr))
237 continue;
238 break;
239 }
240 if (ifap == NULL)
241 errx(1, "no linklocal address is available");
242 memcpy(&src, &((struct sockaddr_in6 *)ifap->ifa_addr)->sin6_addr,
243 sizeof(src));
244 freeifaddrs(ifa);
245 #ifdef __KAME__
246 /* remove embedded ifindex */
247 src.s6_addr[2] = src.s6_addr[3] = 0;
248 #endif
249
250 if ((hbhlen = inet6_opt_init(NULL, 0)) == -1)
251 errx(1, "inet6_opt_init(0) failed");
252 if ((hbhlen = inet6_opt_append(NULL, 0, hbhlen, IP6OPT_ROUTER_ALERT, 2,
253 2, NULL)) == -1)
254 errx(1, "inet6_opt_append(0) failed");
255 if ((hbhlen = inet6_opt_finish(NULL, 0, hbhlen)) == -1)
256 errx(1, "inet6_opt_finish(0) failed");
257 cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(hbhlen);
258
259 if ((cmsgbuf = malloc(cmsglen)) == NULL)
260 errx(1, "can't allocate enough memory for cmsg");
261 cmsgp = (struct cmsghdr *)cmsgbuf;
262 m.msg_control = (caddr_t)cmsgbuf;
263 m.msg_controllen = cmsglen;
264 /* specify the outgoing interface */
265 cmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
266 cmsgp->cmsg_level = IPPROTO_IPV6;
267 cmsgp->cmsg_type = IPV6_PKTINFO;
268 pi = (struct in6_pktinfo *)CMSG_DATA(cmsgp);
269 pi->ipi6_ifindex = index;
270 memcpy(&pi->ipi6_addr, &src, sizeof(pi->ipi6_addr));
271 /* specify to insert router alert option in a hop-by-hop opt hdr. */
272 cmsgp = CMSG_NXTHDR(&m, cmsgp);
273 cmsgp->cmsg_len = CMSG_LEN(hbhlen);
274 cmsgp->cmsg_level = IPPROTO_IPV6;
275 cmsgp->cmsg_type = IPV6_HOPOPTS;
276 hbhbuf = CMSG_DATA(cmsgp);
277 if ((currentlen = inet6_opt_init(hbhbuf, hbhlen)) == -1)
278 errx(1, "inet6_opt_init(len = %d) failed", hbhlen);
279 if ((currentlen = inet6_opt_append(hbhbuf, hbhlen, currentlen,
280 IP6OPT_ROUTER_ALERT, 2,
281 2, &optp)) == -1)
282 errx(1, "inet6_opt_append(currentlen = %d, hbhlen = %d) failed",
283 currentlen, hbhlen);
284 (void)inet6_opt_set_val(optp, 0, &rtalert_code, sizeof(rtalert_code));
285 if ((currentlen = inet6_opt_finish(hbhbuf, hbhlen, currentlen)) == -1)
286 errx(1, "inet6_opt_finish(buf) failed");
287 }
288
289 void
dump(int s)290 dump(int s)
291 {
292 int i;
293 struct mld_hdr *mld;
294 u_char buf[1024];
295 struct sockaddr_in6 from;
296 int from_len = sizeof(from);
297 char ntop_buf[256];
298
299 if ((i = recvfrom(s, buf, sizeof(buf), 0,
300 (struct sockaddr *)&from,
301 &from_len)) < 0)
302 return;
303
304 if (i < sizeof(struct mld_hdr)) {
305 printf("too short!\n");
306 return;
307 }
308
309 mld = (struct mld_hdr *)buf;
310
311 printf("from %s, ", inet_ntop(AF_INET6, &from.sin6_addr,
312 ntop_buf, sizeof(ntop_buf)));
313
314 switch (mld->mld_type) {
315 case ICMP6_MEMBERSHIP_QUERY:
316 printf("type=Multicast Listener Query, ");
317 break;
318 case ICMP6_MEMBERSHIP_REPORT:
319 printf("type=Multicast Listener Report, ");
320 break;
321 case ICMP6_MEMBERSHIP_REDUCTION:
322 printf("type=Multicast Listener Done, ");
323 break;
324 }
325 printf("addr=%s\n", inet_ntop(AF_INET6, &mld->mld_addr,
326 ntop_buf, sizeof(ntop_buf)));
327
328 fflush(stdout);
329 }
330
331 void
quit(int signum __unused)332 quit(int signum __unused)
333 {
334 mreq.ipv6mr_multiaddr = maddr;
335 mreq.ipv6mr_interface = ifindex;
336 if (setsockopt(s, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq,
337 sizeof(mreq)) == -1)
338 err(1, "setsockopt(IPV6_LEAVE_GROUP)");
339
340 exit(0);
341 }
342
343 void
usage(void)344 usage(void)
345 {
346 (void)fprintf(stderr, "usage: mld6query [-dgr] ifname [addr]\n");
347 exit(1);
348 }
349