1 /* $KAME: mld6.c,v 1.15 2003/04/02 11:29:54 suz Exp $ */ 2 3 /* 4 * Copyright (C) 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 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 #include <net/if_var.h> 46 47 #include <netinet/in.h> 48 #include <netinet/ip6.h> 49 #include <netinet/icmp6.h> 50 51 #include <arpa/inet.h> 52 53 #include <stdlib.h> 54 #include <stdio.h> 55 #include <string.h> 56 #include <err.h> 57 58 /* portability with older KAME headers */ 59 #ifndef MLD_LISTENER_QUERY 60 #define MLD_LISTENER_QUERY MLD6_LISTENER_QUERY 61 #define MLD_LISTENER_REPORT MLD6_LISTENER_REPORT 62 #define MLD_LISTENER_DONE MLD6_LISTENER_DONE 63 #define MLD_MTRACE_RESP MLD6_MTRACE_RESP 64 #define MLD_MTRACE MLD6_MTRACE 65 #define mld_hdr mld6_hdr 66 #define mld_type mld6_type 67 #define mld_code mld6_code 68 #define mld_cksum mld6_cksum 69 #define mld_maxdelay mld6_maxdelay 70 #define mld_reserved mld6_reserved 71 #define mld_addr mld6_addr 72 #endif 73 #ifndef IP6OPT_ROUTER_ALERT 74 #define IP6OPT_ROUTER_ALERT IP6OPT_RTALERT 75 #endif 76 77 struct msghdr m; 78 struct sockaddr_in6 dst; 79 struct mld_hdr mldh; 80 struct in6_addr maddr = IN6ADDR_ANY_INIT, any = IN6ADDR_ANY_INIT; 81 struct ipv6_mreq mreq; 82 u_short ifindex; 83 int s; 84 85 #define QUERY_RESPONSE_INTERVAL 10000 86 87 void make_msg(int index, struct in6_addr *addr, u_int type); 88 void usage(void); 89 void dump(int); 90 void quit(int); 91 92 int 93 main(int argc, char *argv[]) 94 { 95 int i; 96 struct icmp6_filter filt; 97 u_int hlim = 1; 98 fd_set fdset; 99 struct itimerval itimer; 100 u_int type; 101 int ch; 102 103 type = MLD_LISTENER_QUERY; 104 while ((ch = getopt(argc, argv, "dr")) != -1) { 105 switch (ch) { 106 case 'd': 107 type = MLD_LISTENER_DONE; 108 break; 109 case 'r': 110 type = MLD_LISTENER_REPORT; 111 break; 112 default: 113 usage(); 114 /*NOTREACHED*/ 115 } 116 } 117 118 argv += optind; 119 argc -= optind; 120 121 if (argc != 1 && argc != 2) 122 usage(); 123 124 ifindex = (u_short)if_nametoindex(argv[0]); 125 if (ifindex == 0) 126 usage(); 127 if (argc == 2 && inet_pton(AF_INET6, argv[1], &maddr) != 1) 128 usage(); 129 130 if ((s = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) 131 err(1, "socket"); 132 133 if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hlim, 134 sizeof(hlim)) == -1) 135 err(1, "setsockopt(IPV6_MULTICAST_HOPS)"); 136 137 mreq.ipv6mr_multiaddr = any; 138 mreq.ipv6mr_interface = ifindex; 139 if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, 140 sizeof(mreq)) == -1) 141 err(1, "setsockopt(IPV6_JOIN_GROUP)"); 142 143 ICMP6_FILTER_SETBLOCKALL(&filt); 144 ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_QUERY, &filt); 145 ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REPORT, &filt); 146 ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REDUCTION, &filt); 147 if (setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER, &filt, 148 sizeof(filt)) < 0) 149 err(1, "setsockopt(ICMP6_FILTER)"); 150 151 make_msg(ifindex, &maddr, type); 152 153 if (sendmsg(s, &m, 0) < 0) 154 err(1, "sendmsg"); 155 156 itimer.it_value.tv_sec = QUERY_RESPONSE_INTERVAL / 1000; 157 itimer.it_interval.tv_sec = 0; 158 itimer.it_interval.tv_usec = 0; 159 itimer.it_value.tv_usec = 0; 160 161 (void)signal(SIGALRM, quit); 162 (void)setitimer(ITIMER_REAL, &itimer, NULL); 163 164 FD_ZERO(&fdset); 165 if (s >= FD_SETSIZE) 166 errx(1, "descriptor too big"); 167 for (;;) { 168 FD_SET(s, &fdset); 169 if ((i = select(s + 1, &fdset, NULL, NULL, NULL)) < 0) 170 perror("select"); 171 if (i == 0) 172 continue; 173 else 174 dump(s); 175 } 176 } 177 178 void 179 make_msg(int index, struct in6_addr *addr, u_int type) 180 { 181 static struct iovec iov[2]; 182 static u_char *cmsgbuf; 183 int cmsglen, hbhlen = 0; 184 #ifdef USE_RFC2292BIS 185 void *hbhbuf = NULL, *optp = NULL; 186 int currentlen; 187 #else 188 u_int8_t raopt[IP6OPT_RTALERT_LEN]; 189 #endif 190 struct in6_pktinfo *pi; 191 struct cmsghdr *cmsgp; 192 u_short rtalert_code = htons(IP6OPT_RTALERT_MLD); 193 struct ifaddrs *ifa, *ifap; 194 struct in6_addr src; 195 196 dst.sin6_len = sizeof(dst); 197 dst.sin6_family = AF_INET6; 198 if (IN6_IS_ADDR_UNSPECIFIED(addr)) { 199 if (inet_pton(AF_INET6, "ff02::1", &dst.sin6_addr) != 1) 200 errx(1, "inet_pton failed"); 201 } 202 else 203 dst.sin6_addr = *addr; 204 m.msg_name = (caddr_t)&dst; 205 m.msg_namelen = dst.sin6_len; 206 iov[0].iov_base = (caddr_t)&mldh; 207 iov[0].iov_len = sizeof(mldh); 208 m.msg_iov = iov; 209 m.msg_iovlen = 1; 210 211 bzero(&mldh, sizeof(mldh)); 212 mldh.mld_type = type & 0xff; 213 mldh.mld_maxdelay = htons(QUERY_RESPONSE_INTERVAL); 214 mldh.mld_addr = *addr; 215 216 /* MLD packet should be advertised from linklocal address */ 217 getifaddrs(&ifa); 218 for (ifap = ifa; ifap; ifap = ifap->ifa_next) { 219 if (index != if_nametoindex(ifap->ifa_name)) 220 continue; 221 222 if (ifap->ifa_addr->sa_family != AF_INET6) 223 continue; 224 if (!IN6_IS_ADDR_LINKLOCAL(&((struct sockaddr_in6 *) 225 ifap->ifa_addr)->sin6_addr)) 226 continue; 227 break; 228 } 229 if (ifap == NULL) 230 errx(1, "no linkocal address is available"); 231 memcpy(&src, &((struct sockaddr_in6 *)ifap->ifa_addr)->sin6_addr, 232 sizeof(src)); 233 freeifaddrs(ifa); 234 #ifdef __KAME__ 235 /* remove embedded ifindex */ 236 src.s6_addr[2] = src.s6_addr[3] = 0; 237 #endif 238 239 #ifdef USE_RFC2292BIS 240 if ((hbhlen = inet6_opt_init(NULL, 0)) == -1) 241 errx(1, "inet6_opt_init(0) failed"); 242 if ((hbhlen = inet6_opt_append(NULL, 0, hbhlen, IP6OPT_ROUTER_ALERT, 2, 243 2, NULL)) == -1) 244 errx(1, "inet6_opt_append(0) failed"); 245 if ((hbhlen = inet6_opt_finish(NULL, 0, hbhlen)) == -1) 246 errx(1, "inet6_opt_finish(0) failed"); 247 cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(hbhlen); 248 #else 249 hbhlen = sizeof(raopt); 250 cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + 251 inet6_option_space(hbhlen); 252 #endif 253 254 if ((cmsgbuf = malloc(cmsglen)) == NULL) 255 errx(1, "can't allocate enough memory for cmsg"); 256 cmsgp = (struct cmsghdr *)cmsgbuf; 257 m.msg_control = (caddr_t)cmsgbuf; 258 m.msg_controllen = cmsglen; 259 /* specify the outgoing interface */ 260 cmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 261 cmsgp->cmsg_level = IPPROTO_IPV6; 262 cmsgp->cmsg_type = IPV6_PKTINFO; 263 pi = (struct in6_pktinfo *)CMSG_DATA(cmsgp); 264 pi->ipi6_ifindex = index; 265 memcpy(&pi->ipi6_addr, &src, sizeof(pi->ipi6_addr)); 266 /* specifiy to insert router alert option in a hop-by-hop opt hdr. */ 267 cmsgp = CMSG_NXTHDR(&m, cmsgp); 268 #ifdef USE_RFC2292BIS 269 cmsgp->cmsg_len = CMSG_LEN(hbhlen); 270 cmsgp->cmsg_level = IPPROTO_IPV6; 271 cmsgp->cmsg_type = IPV6_HOPOPTS; 272 hbhbuf = CMSG_DATA(cmsgp); 273 if ((currentlen = inet6_opt_init(hbhbuf, hbhlen)) == -1) 274 errx(1, "inet6_opt_init(len = %d) failed", hbhlen); 275 if ((currentlen = inet6_opt_append(hbhbuf, hbhlen, currentlen, 276 IP6OPT_ROUTER_ALERT, 2, 277 2, &optp)) == -1) 278 errx(1, "inet6_opt_append(currentlen = %d, hbhlen = %d) failed", 279 currentlen, hbhlen); 280 (void)inet6_opt_set_val(optp, 0, &rtalert_code, sizeof(rtalert_code)); 281 if ((currentlen = inet6_opt_finish(hbhbuf, hbhlen, currentlen)) == -1) 282 errx(1, "inet6_opt_finish(buf) failed"); 283 #else /* old advanced API */ 284 if (inet6_option_init((void *)cmsgp, &cmsgp, IPV6_HOPOPTS)) 285 errx(1, "inet6_option_init failed\n"); 286 raopt[0] = IP6OPT_ROUTER_ALERT; 287 raopt[1] = IP6OPT_RTALERT_LEN - 2; 288 memcpy(&raopt[2], (caddr_t)&rtalert_code, sizeof(u_short)); 289 if (inet6_option_append(cmsgp, raopt, 4, 0)) 290 errx(1, "inet6_option_append failed\n"); 291 #endif 292 } 293 294 void 295 dump(int s) 296 { 297 int i; 298 struct mld_hdr *mld; 299 u_char buf[1024]; 300 struct sockaddr_in6 from; 301 int from_len = sizeof(from); 302 char ntop_buf[256]; 303 304 if ((i = recvfrom(s, buf, sizeof(buf), 0, 305 (struct sockaddr *)&from, 306 &from_len)) < 0) 307 return; 308 309 if (i < sizeof(struct mld_hdr)) { 310 printf("too short!\n"); 311 return; 312 } 313 314 mld = (struct mld_hdr *)buf; 315 316 printf("from %s, ", inet_ntop(AF_INET6, &from.sin6_addr, 317 ntop_buf, sizeof(ntop_buf))); 318 319 switch (mld->mld_type) { 320 case ICMP6_MEMBERSHIP_QUERY: 321 printf("type=Multicast Listener Query, "); 322 break; 323 case ICMP6_MEMBERSHIP_REPORT: 324 printf("type=Multicast Listener Report, "); 325 break; 326 case ICMP6_MEMBERSHIP_REDUCTION: 327 printf("type=Multicast Listener Done, "); 328 break; 329 } 330 printf("addr=%s\n", inet_ntop(AF_INET6, &mld->mld_addr, 331 ntop_buf, sizeof(ntop_buf))); 332 333 fflush(stdout); 334 } 335 336 void 337 quit(int signum __unused) 338 { 339 mreq.ipv6mr_multiaddr = any; 340 mreq.ipv6mr_interface = ifindex; 341 if (setsockopt(s, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq, 342 sizeof(mreq)) == -1) 343 err(1, "setsockopt(IPV6_LEAVE_GROUP)"); 344 345 exit(0); 346 } 347 348 void 349 usage(void) 350 { 351 (void)fprintf(stderr, "usage: mld6query ifname [addr]\n"); 352 exit(1); 353 } 354