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 void *hbhbuf = NULL, *optp = NULL; 207 int currentlen; 208 struct in6_pktinfo *pi; 209 struct cmsghdr *cmsgp; 210 u_short rtalert_code = htons(IP6OPT_RTALERT_MLD); 211 struct ifaddrs *ifa, *ifap; 212 struct in6_addr src; 213 214 dst.sin6_len = sizeof(dst); 215 dst.sin6_family = AF_INET6; 216 dst.sin6_addr = *addr; 217 m.msg_name = (caddr_t)&dst; 218 m.msg_namelen = dst.sin6_len; 219 iov[0].iov_base = (caddr_t)&mldh; 220 iov[0].iov_len = sizeof(mldh); 221 m.msg_iov = iov; 222 m.msg_iovlen = 1; 223 224 bzero(&mldh, sizeof(mldh)); 225 mldh.mld_type = type & 0xff; 226 mldh.mld_maxdelay = htons(QUERY_RESPONSE_INTERVAL); 227 mldh.mld_addr = *qaddr; 228 229 /* MLD packet should be advertised from linklocal address */ 230 getifaddrs(&ifa); 231 for (ifap = ifa; ifap; ifap = ifap->ifa_next) { 232 if (index != if_nametoindex(ifap->ifa_name)) 233 continue; 234 235 if (ifap->ifa_addr->sa_family != AF_INET6) 236 continue; 237 if (!IN6_IS_ADDR_LINKLOCAL(&((struct sockaddr_in6 *) 238 ifap->ifa_addr)->sin6_addr)) 239 continue; 240 break; 241 } 242 if (ifap == NULL) 243 errx(1, "no linklocal address is available"); 244 memcpy(&src, &((struct sockaddr_in6 *)ifap->ifa_addr)->sin6_addr, 245 sizeof(src)); 246 freeifaddrs(ifa); 247 #ifdef __KAME__ 248 /* remove embedded ifindex */ 249 src.s6_addr[2] = src.s6_addr[3] = 0; 250 #endif 251 252 if ((hbhlen = inet6_opt_init(NULL, 0)) == -1) 253 errx(1, "inet6_opt_init(0) failed"); 254 if ((hbhlen = inet6_opt_append(NULL, 0, hbhlen, IP6OPT_ROUTER_ALERT, 2, 255 2, NULL)) == -1) 256 errx(1, "inet6_opt_append(0) failed"); 257 if ((hbhlen = inet6_opt_finish(NULL, 0, hbhlen)) == -1) 258 errx(1, "inet6_opt_finish(0) failed"); 259 cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(hbhlen); 260 261 if ((cmsgbuf = malloc(cmsglen)) == NULL) 262 errx(1, "can't allocate enough memory for cmsg"); 263 cmsgp = (struct cmsghdr *)cmsgbuf; 264 m.msg_control = (caddr_t)cmsgbuf; 265 m.msg_controllen = cmsglen; 266 /* specify the outgoing interface */ 267 cmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 268 cmsgp->cmsg_level = IPPROTO_IPV6; 269 cmsgp->cmsg_type = IPV6_PKTINFO; 270 pi = (struct in6_pktinfo *)CMSG_DATA(cmsgp); 271 pi->ipi6_ifindex = index; 272 memcpy(&pi->ipi6_addr, &src, sizeof(pi->ipi6_addr)); 273 /* specifiy to insert router alert option in a hop-by-hop opt hdr. */ 274 cmsgp = CMSG_NXTHDR(&m, cmsgp); 275 cmsgp->cmsg_len = CMSG_LEN(hbhlen); 276 cmsgp->cmsg_level = IPPROTO_IPV6; 277 cmsgp->cmsg_type = IPV6_HOPOPTS; 278 hbhbuf = CMSG_DATA(cmsgp); 279 if ((currentlen = inet6_opt_init(hbhbuf, hbhlen)) == -1) 280 errx(1, "inet6_opt_init(len = %d) failed", hbhlen); 281 if ((currentlen = inet6_opt_append(hbhbuf, hbhlen, currentlen, 282 IP6OPT_ROUTER_ALERT, 2, 283 2, &optp)) == -1) 284 errx(1, "inet6_opt_append(currentlen = %d, hbhlen = %d) failed", 285 currentlen, hbhlen); 286 (void)inet6_opt_set_val(optp, 0, &rtalert_code, sizeof(rtalert_code)); 287 if ((currentlen = inet6_opt_finish(hbhbuf, hbhlen, currentlen)) == -1) 288 errx(1, "inet6_opt_finish(buf) failed"); 289 } 290 291 void 292 dump(int s) 293 { 294 int i; 295 struct mld_hdr *mld; 296 u_char buf[1024]; 297 struct sockaddr_in6 from; 298 int from_len = sizeof(from); 299 char ntop_buf[256]; 300 301 if ((i = recvfrom(s, buf, sizeof(buf), 0, 302 (struct sockaddr *)&from, 303 &from_len)) < 0) 304 return; 305 306 if (i < sizeof(struct mld_hdr)) { 307 printf("too short!\n"); 308 return; 309 } 310 311 mld = (struct mld_hdr *)buf; 312 313 printf("from %s, ", inet_ntop(AF_INET6, &from.sin6_addr, 314 ntop_buf, sizeof(ntop_buf))); 315 316 switch (mld->mld_type) { 317 case ICMP6_MEMBERSHIP_QUERY: 318 printf("type=Multicast Listener Query, "); 319 break; 320 case ICMP6_MEMBERSHIP_REPORT: 321 printf("type=Multicast Listener Report, "); 322 break; 323 case ICMP6_MEMBERSHIP_REDUCTION: 324 printf("type=Multicast Listener Done, "); 325 break; 326 } 327 printf("addr=%s\n", inet_ntop(AF_INET6, &mld->mld_addr, 328 ntop_buf, sizeof(ntop_buf))); 329 330 fflush(stdout); 331 } 332 333 void 334 quit(int signum __unused) 335 { 336 mreq.ipv6mr_multiaddr = maddr; 337 mreq.ipv6mr_interface = ifindex; 338 if (setsockopt(s, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq, 339 sizeof(mreq)) == -1) 340 err(1, "setsockopt(IPV6_LEAVE_GROUP)"); 341 342 exit(0); 343 } 344 345 void 346 usage(void) 347 { 348 (void)fprintf(stderr, "usage: mld6query [-dgr] ifname [addr]\n"); 349 exit(1); 350 } 351