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 __FBSDID("$FreeBSD$"); 36 37 #include <sys/param.h> 38 #include <sys/uio.h> 39 #include <sys/socket.h> 40 #include <sys/types.h> 41 #include <sys/time.h> 42 #include <ifaddrs.h> 43 #include <unistd.h> 44 #include <signal.h> 45 46 #include <net/if.h> 47 48 #include <netinet/in.h> 49 #include <netinet/ip6.h> 50 #include <netinet/icmp6.h> 51 52 #include <arpa/inet.h> 53 54 #include <stdlib.h> 55 #include <stdio.h> 56 #include <string.h> 57 #include <err.h> 58 59 /* portability with older KAME headers */ 60 #ifndef MLD_LISTENER_QUERY 61 #define MLD_LISTENER_QUERY MLD6_LISTENER_QUERY 62 #define MLD_LISTENER_REPORT MLD6_LISTENER_REPORT 63 #define MLD_LISTENER_DONE MLD6_LISTENER_DONE 64 #define MLD_MTRACE_RESP MLD6_MTRACE_RESP 65 #define MLD_MTRACE MLD6_MTRACE 66 #define mld_hdr mld6_hdr 67 #define mld_type mld6_type 68 #define mld_code mld6_code 69 #define mld_cksum mld6_cksum 70 #define mld_maxdelay mld6_maxdelay 71 #define mld_reserved mld6_reserved 72 #define mld_addr mld6_addr 73 #endif 74 #ifndef IP6OPT_ROUTER_ALERT 75 #define IP6OPT_ROUTER_ALERT IP6OPT_RTALERT 76 #endif 77 78 struct msghdr m; 79 struct sockaddr_in6 dst; 80 struct mld_hdr mldh; 81 struct in6_addr maddr = IN6ADDR_ANY_INIT, any = IN6ADDR_ANY_INIT; 82 struct ipv6_mreq mreq; 83 u_short ifindex; 84 int s; 85 86 #define QUERY_RESPONSE_INTERVAL 10000 87 88 void make_msg(int index, struct in6_addr *addr, u_int type, struct in6_addr *qaddr); 89 void usage(void); 90 void dump(int); 91 void quit(int); 92 93 int 94 main(int argc, char *argv[]) 95 { 96 int i; 97 struct icmp6_filter filt; 98 u_int hlim = 1; 99 fd_set fdset; 100 struct itimerval itimer; 101 u_int type; 102 int ch; 103 struct in6_addr *qaddr = &maddr; 104 105 type = MLD_LISTENER_QUERY; 106 while ((ch = getopt(argc, argv, "dgr")) != -1) { 107 switch (ch) { 108 case 'd': 109 if (type != MLD_LISTENER_QUERY) { 110 printf("Can not specifiy -d with -r\n"); 111 return 1; 112 } 113 type = MLD_LISTENER_DONE; 114 break; 115 case 'g': 116 qaddr = &any; 117 break; 118 case 'r': 119 if (type != MLD_LISTENER_QUERY) { 120 printf("Can not specifiy -r with -d\n"); 121 return 1; 122 } 123 type = MLD_LISTENER_REPORT; 124 break; 125 default: 126 usage(); 127 /*NOTREACHED*/ 128 } 129 } 130 131 argv += optind; 132 argc -= optind; 133 134 if (argc != 1 && argc != 2) 135 usage(); 136 137 ifindex = (u_short)if_nametoindex(argv[0]); 138 if (ifindex == 0) 139 usage(); 140 if (argc == 2 && inet_pton(AF_INET6, argv[1], &maddr) != 1) 141 usage(); 142 if (type != MLD_LISTENER_QUERY && qaddr != &maddr) { 143 printf("Can not specifiy -g with -d or -r\n"); 144 return 1; 145 } 146 147 if ((s = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) 148 err(1, "socket"); 149 150 if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hlim, 151 sizeof(hlim)) == -1) 152 err(1, "setsockopt(IPV6_MULTICAST_HOPS)"); 153 154 if (IN6_IS_ADDR_UNSPECIFIED(&maddr)) { 155 if (inet_pton(AF_INET6, "ff02::1", &maddr) != 1) 156 errx(1, "inet_pton failed"); 157 } 158 159 mreq.ipv6mr_multiaddr = maddr; 160 mreq.ipv6mr_interface = ifindex; 161 if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, 162 sizeof(mreq)) == -1) 163 err(1, "setsockopt(IPV6_JOIN_GROUP)"); 164 165 ICMP6_FILTER_SETBLOCKALL(&filt); 166 ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_QUERY, &filt); 167 ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REPORT, &filt); 168 ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REDUCTION, &filt); 169 if (setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER, &filt, 170 sizeof(filt)) < 0) 171 err(1, "setsockopt(ICMP6_FILTER)"); 172 173 make_msg(ifindex, &maddr, type, qaddr); 174 175 if (sendmsg(s, &m, 0) < 0) 176 err(1, "sendmsg"); 177 178 itimer.it_value.tv_sec = QUERY_RESPONSE_INTERVAL / 1000; 179 itimer.it_interval.tv_sec = 0; 180 itimer.it_interval.tv_usec = 0; 181 itimer.it_value.tv_usec = 0; 182 183 (void)signal(SIGALRM, quit); 184 (void)setitimer(ITIMER_REAL, &itimer, NULL); 185 186 FD_ZERO(&fdset); 187 if (s >= FD_SETSIZE) 188 errx(1, "descriptor too big"); 189 for (;;) { 190 FD_SET(s, &fdset); 191 if ((i = select(s + 1, &fdset, NULL, NULL, NULL)) < 0) 192 perror("select"); 193 if (i == 0) 194 continue; 195 else 196 dump(s); 197 } 198 } 199 200 void 201 make_msg(int index, struct in6_addr *addr, u_int type, struct in6_addr *qaddr) 202 { 203 static struct iovec iov[2]; 204 static u_char *cmsgbuf; 205 int cmsglen, hbhlen = 0; 206 #ifdef USE_RFC2292BIS 207 void *hbhbuf = NULL, *optp = NULL; 208 int currentlen; 209 #else 210 u_int8_t raopt[IP6OPT_RTALERT_LEN]; 211 #endif 212 struct in6_pktinfo *pi; 213 struct cmsghdr *cmsgp; 214 u_short rtalert_code = htons(IP6OPT_RTALERT_MLD); 215 struct ifaddrs *ifa, *ifap; 216 struct in6_addr src; 217 218 dst.sin6_len = sizeof(dst); 219 dst.sin6_family = AF_INET6; 220 dst.sin6_addr = *addr; 221 m.msg_name = (caddr_t)&dst; 222 m.msg_namelen = dst.sin6_len; 223 iov[0].iov_base = (caddr_t)&mldh; 224 iov[0].iov_len = sizeof(mldh); 225 m.msg_iov = iov; 226 m.msg_iovlen = 1; 227 228 bzero(&mldh, sizeof(mldh)); 229 mldh.mld_type = type & 0xff; 230 mldh.mld_maxdelay = htons(QUERY_RESPONSE_INTERVAL); 231 mldh.mld_addr = *qaddr; 232 233 /* MLD packet should be advertised from linklocal address */ 234 getifaddrs(&ifa); 235 for (ifap = ifa; ifap; ifap = ifap->ifa_next) { 236 if (index != if_nametoindex(ifap->ifa_name)) 237 continue; 238 239 if (ifap->ifa_addr->sa_family != AF_INET6) 240 continue; 241 if (!IN6_IS_ADDR_LINKLOCAL(&((struct sockaddr_in6 *) 242 ifap->ifa_addr)->sin6_addr)) 243 continue; 244 break; 245 } 246 if (ifap == NULL) 247 errx(1, "no linkocal address is available"); 248 memcpy(&src, &((struct sockaddr_in6 *)ifap->ifa_addr)->sin6_addr, 249 sizeof(src)); 250 freeifaddrs(ifa); 251 #ifdef __KAME__ 252 /* remove embedded ifindex */ 253 src.s6_addr[2] = src.s6_addr[3] = 0; 254 #endif 255 256 #ifdef USE_RFC2292BIS 257 if ((hbhlen = inet6_opt_init(NULL, 0)) == -1) 258 errx(1, "inet6_opt_init(0) failed"); 259 if ((hbhlen = inet6_opt_append(NULL, 0, hbhlen, IP6OPT_ROUTER_ALERT, 2, 260 2, NULL)) == -1) 261 errx(1, "inet6_opt_append(0) failed"); 262 if ((hbhlen = inet6_opt_finish(NULL, 0, hbhlen)) == -1) 263 errx(1, "inet6_opt_finish(0) failed"); 264 cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(hbhlen); 265 #else 266 hbhlen = sizeof(raopt); 267 cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + 268 inet6_option_space(hbhlen); 269 #endif 270 271 if ((cmsgbuf = malloc(cmsglen)) == NULL) 272 errx(1, "can't allocate enough memory for cmsg"); 273 cmsgp = (struct cmsghdr *)cmsgbuf; 274 m.msg_control = (caddr_t)cmsgbuf; 275 m.msg_controllen = cmsglen; 276 /* specify the outgoing interface */ 277 cmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 278 cmsgp->cmsg_level = IPPROTO_IPV6; 279 cmsgp->cmsg_type = IPV6_PKTINFO; 280 pi = (struct in6_pktinfo *)CMSG_DATA(cmsgp); 281 pi->ipi6_ifindex = index; 282 memcpy(&pi->ipi6_addr, &src, sizeof(pi->ipi6_addr)); 283 /* specifiy to insert router alert option in a hop-by-hop opt hdr. */ 284 cmsgp = CMSG_NXTHDR(&m, cmsgp); 285 #ifdef USE_RFC2292BIS 286 cmsgp->cmsg_len = CMSG_LEN(hbhlen); 287 cmsgp->cmsg_level = IPPROTO_IPV6; 288 cmsgp->cmsg_type = IPV6_HOPOPTS; 289 hbhbuf = CMSG_DATA(cmsgp); 290 if ((currentlen = inet6_opt_init(hbhbuf, hbhlen)) == -1) 291 errx(1, "inet6_opt_init(len = %d) failed", hbhlen); 292 if ((currentlen = inet6_opt_append(hbhbuf, hbhlen, currentlen, 293 IP6OPT_ROUTER_ALERT, 2, 294 2, &optp)) == -1) 295 errx(1, "inet6_opt_append(currentlen = %d, hbhlen = %d) failed", 296 currentlen, hbhlen); 297 (void)inet6_opt_set_val(optp, 0, &rtalert_code, sizeof(rtalert_code)); 298 if ((currentlen = inet6_opt_finish(hbhbuf, hbhlen, currentlen)) == -1) 299 errx(1, "inet6_opt_finish(buf) failed"); 300 #else /* old advanced API */ 301 if (inet6_option_init((void *)cmsgp, &cmsgp, IPV6_HOPOPTS)) 302 errx(1, "inet6_option_init failed\n"); 303 raopt[0] = IP6OPT_ROUTER_ALERT; 304 raopt[1] = IP6OPT_RTALERT_LEN - 2; 305 memcpy(&raopt[2], (caddr_t)&rtalert_code, sizeof(u_short)); 306 if (inet6_option_append(cmsgp, raopt, 4, 0)) 307 errx(1, "inet6_option_append failed\n"); 308 #endif 309 } 310 311 void 312 dump(int s) 313 { 314 int i; 315 struct mld_hdr *mld; 316 u_char buf[1024]; 317 struct sockaddr_in6 from; 318 int from_len = sizeof(from); 319 char ntop_buf[256]; 320 321 if ((i = recvfrom(s, buf, sizeof(buf), 0, 322 (struct sockaddr *)&from, 323 &from_len)) < 0) 324 return; 325 326 if (i < sizeof(struct mld_hdr)) { 327 printf("too short!\n"); 328 return; 329 } 330 331 mld = (struct mld_hdr *)buf; 332 333 printf("from %s, ", inet_ntop(AF_INET6, &from.sin6_addr, 334 ntop_buf, sizeof(ntop_buf))); 335 336 switch (mld->mld_type) { 337 case ICMP6_MEMBERSHIP_QUERY: 338 printf("type=Multicast Listener Query, "); 339 break; 340 case ICMP6_MEMBERSHIP_REPORT: 341 printf("type=Multicast Listener Report, "); 342 break; 343 case ICMP6_MEMBERSHIP_REDUCTION: 344 printf("type=Multicast Listener Done, "); 345 break; 346 } 347 printf("addr=%s\n", inet_ntop(AF_INET6, &mld->mld_addr, 348 ntop_buf, sizeof(ntop_buf))); 349 350 fflush(stdout); 351 } 352 353 void 354 quit(int signum __unused) 355 { 356 mreq.ipv6mr_multiaddr = maddr; 357 mreq.ipv6mr_interface = ifindex; 358 if (setsockopt(s, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq, 359 sizeof(mreq)) == -1) 360 err(1, "setsockopt(IPV6_LEAVE_GROUP)"); 361 362 exit(0); 363 } 364 365 void 366 usage(void) 367 { 368 (void)fprintf(stderr, "usage: mld6query [-dgr] ifname [addr]\n"); 369 exit(1); 370 } 371