1 /* $NetBSD: mld6.c,v 1.16 2023/06/24 05:15:42 msaitoh Exp $ */ 2 /* $KAME: mld6.c,v 1.9 2000/12/04 06:29:37 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 #include <sys/param.h> 33 #include <sys/uio.h> 34 #include <sys/socket.h> 35 #include <sys/types.h> 36 #include <sys/time.h> 37 #include <poll.h> 38 #include <unistd.h> 39 #include <signal.h> 40 41 #include <net/if.h> 42 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 43 #include <net/if_var.h> 44 #endif /* __FreeBSD__ >= 3 */ 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 static struct msghdr m; 58 static struct sockaddr_in6 dst; 59 static struct mld6_hdr mldh; 60 static struct in6_addr maddr = IN6ADDR_ANY_INIT, any = IN6ADDR_ANY_INIT; 61 static struct ipv6_mreq mreq; 62 static u_short ifindex; 63 static int sock; 64 65 #define QUERY_RESPONSE_INTERVAL 10000 66 67 static void make_msg(int index, struct in6_addr *addr, u_int type); 68 __dead static void usage(void); 69 static void dump(int); 70 __dead static void quit(int); 71 72 int 73 main(int argc, char *argv[]) 74 { 75 int i; 76 struct icmp6_filter filt; 77 u_int hlim = 1; 78 struct pollfd set[1]; 79 struct itimerval itimer; 80 u_int type; 81 int ch; 82 83 type = MLD_LISTENER_QUERY; 84 while ((ch = getopt(argc, argv, "dr")) != -1) { 85 switch (ch) { 86 case 'd': 87 type = MLD_LISTENER_DONE; 88 break; 89 case 'r': 90 type = MLD_LISTENER_REPORT; 91 break; 92 default: 93 usage(); 94 /*NOTREACHED*/ 95 } 96 } 97 98 argv += optind; 99 argc -= optind; 100 101 if (argc != 1 && argc != 2) 102 usage(); 103 104 ifindex = (u_short)if_nametoindex(argv[0]); 105 if (ifindex == 0) 106 usage(); 107 if (argc == 3 && inet_pton(AF_INET6, argv[1], &maddr) != 1) 108 usage(); 109 110 if ((sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) 111 err(1, "socket"); 112 113 if (setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hlim, 114 sizeof(hlim)) == -1) 115 err(1, "setsockopt(IPV6_MULTICAST_HOPS)"); 116 117 mreq.ipv6mr_multiaddr = any; 118 mreq.ipv6mr_interface = ifindex; 119 if (setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, 120 sizeof(mreq)) == -1) 121 err(1, "setsockopt(IPV6_JOIN_GROUP)"); 122 123 ICMP6_FILTER_SETBLOCKALL(&filt); 124 ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_QUERY, &filt); 125 ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REPORT, &filt); 126 ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REDUCTION, &filt); 127 if (setsockopt(sock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt, 128 sizeof(filt)) < 0) 129 err(1, "setsockopt(ICMP6_FILTER)"); 130 131 make_msg(ifindex, &maddr, type); 132 133 if (sendmsg(sock, &m, 0) < 0) 134 err(1, "sendmsg"); 135 136 itimer.it_value.tv_sec = QUERY_RESPONSE_INTERVAL / 1000; 137 itimer.it_interval.tv_sec = 0; 138 itimer.it_interval.tv_usec = 0; 139 itimer.it_value.tv_usec = 0; 140 141 (void)signal(SIGALRM, quit); 142 (void)setitimer(ITIMER_REAL, &itimer, NULL); 143 144 set[0].fd = sock; 145 set[0].events = POLLIN; 146 for (;;) { 147 if ((i = poll(set, 1, INFTIM)) < 0) 148 perror("poll"); 149 if (i == 0) 150 continue; 151 else 152 dump(sock); 153 } 154 } 155 156 static void 157 make_msg(int idx, struct in6_addr *addr, u_int type) 158 { 159 static struct iovec iov[2]; 160 static u_char *cmsgbuf; 161 int cmsglen, hbhlen = 0; 162 #ifdef USE_RFC2292BIS 163 void *hbhbuf = NULL, *optp = NULL; 164 int currentlen; 165 #else 166 u_int8_t raopt[IP6OPT_RTALERT_LEN]; 167 #endif 168 struct in6_pktinfo *pi; 169 struct cmsghdr *cmsgp; 170 u_short rtalert_code = htons(IP6OPT_RTALERT_MLD); 171 172 dst.sin6_len = sizeof(dst); 173 dst.sin6_family = AF_INET6; 174 if (IN6_IS_ADDR_UNSPECIFIED(addr)) { 175 if (inet_pton(AF_INET6, "ff02::1", &dst.sin6_addr) != 1) 176 errx(1, "inet_pton failed"); 177 } 178 else 179 dst.sin6_addr = *addr; 180 m.msg_name = (caddr_t)&dst; 181 m.msg_namelen = dst.sin6_len; 182 iov[0].iov_base = (caddr_t)&mldh; 183 iov[0].iov_len = sizeof(mldh); 184 m.msg_iov = iov; 185 m.msg_iovlen = 1; 186 187 bzero(&mldh, sizeof(mldh)); 188 mldh.mld6_type = type & 0xff; 189 mldh.mld6_maxdelay = htons(QUERY_RESPONSE_INTERVAL); 190 mldh.mld6_addr = *addr; 191 192 #ifdef USE_RFC2292BIS 193 if ((hbhlen = inet6_opt_init(NULL, 0)) == -1) 194 errx(1, "inet6_opt_init(0) failed"); 195 if ((hbhlen = inet6_opt_append(NULL, 0, hbhlen, IP6OPT_ROUTER_ALERT, 2, 196 2, NULL)) == -1) 197 errx(1, "inet6_opt_append(0) failed"); 198 if ((hbhlen = inet6_opt_finish(NULL, 0, hbhlen)) == -1) 199 errx(1, "inet6_opt_finish(0) failed"); 200 cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(hbhlen); 201 #else 202 hbhlen = sizeof(raopt); 203 cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + 204 inet6_option_space(hbhlen); 205 #endif 206 207 if ((cmsgbuf = malloc(cmsglen)) == NULL) 208 errx(1, "can't allocate enough memory for cmsg"); 209 cmsgp = (struct cmsghdr *)cmsgbuf; 210 m.msg_control = (caddr_t)cmsgbuf; 211 m.msg_controllen = cmsglen; 212 /* specify the outgoing interface */ 213 cmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 214 cmsgp->cmsg_level = IPPROTO_IPV6; 215 cmsgp->cmsg_type = IPV6_PKTINFO; 216 pi = (struct in6_pktinfo *)CMSG_DATA(cmsgp); 217 pi->ipi6_ifindex = idx; 218 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); 219 /* specify to insert router alert option in a hop-by-hop opt hdr. */ 220 cmsgp = CMSG_NXTHDR(&m, cmsgp); 221 #ifdef USE_RFC2292BIS 222 cmsgp->cmsg_len = CMSG_LEN(hbhlen); 223 cmsgp->cmsg_level = IPPROTO_IPV6; 224 cmsgp->cmsg_type = IPV6_HOPOPTS; 225 hbhbuf = CMSG_DATA(cmsgp); 226 if ((currentlen = inet6_opt_init(hbhbuf, hbhlen)) == -1) 227 errx(1, "inet6_opt_init(len = %d) failed", hbhlen); 228 if ((currentlen = inet6_opt_append(hbhbuf, hbhlen, currentlen, 229 IP6OPT_ROUTER_ALERT, 2, 230 2, &optp)) == -1) 231 errx(1, "inet6_opt_append(currentlen = %d, hbhlen = %d) failed", 232 currentlen, hbhlen); 233 (void)inet6_opt_set_val(optp, 0, &rtalert_code, sizeof(rtalert_code)); 234 if ((currentlen = inet6_opt_finish(hbhbuf, hbhlen, currentlen)) == -1) 235 errx(1, "inet6_opt_finish(buf) failed"); 236 #else /* old advanced API */ 237 if (inet6_option_init((void *)cmsgp, &cmsgp, IPV6_HOPOPTS)) 238 errx(1, "inet6_option_init failed"); 239 raopt[0] = IP6OPT_RTALERT; 240 raopt[1] = IP6OPT_RTALERT_LEN - 2; 241 memcpy(&raopt[2], (caddr_t)&rtalert_code, sizeof(u_short)); 242 if (inet6_option_append(cmsgp, raopt, 4, 0)) 243 errx(1, "inet6_option_append failed"); 244 #endif 245 } 246 247 static void 248 dump(int s) 249 { 250 int i; 251 struct mld6_hdr *mld; 252 u_char buf[1024]; 253 struct sockaddr_in6 from; 254 socklen_t from_len = sizeof(from); 255 char ntop_buf[256]; 256 257 if ((i = recvfrom(s, buf, sizeof(buf), 0, 258 (struct sockaddr *)&from, 259 &from_len)) < 0) 260 return; 261 262 if (i < (int)sizeof(struct mld6_hdr)) { 263 printf("too short!\n"); 264 return; 265 } 266 267 mld = (struct mld6_hdr *)buf; 268 269 printf("from %s, ", inet_ntop(AF_INET6, &from.sin6_addr, 270 ntop_buf, sizeof(ntop_buf))); 271 272 switch (mld->mld6_type) { 273 case ICMP6_MEMBERSHIP_QUERY: 274 printf("type=Multicast Listener Query, "); 275 break; 276 case ICMP6_MEMBERSHIP_REPORT: 277 printf("type=Multicast Listener Report, "); 278 break; 279 case ICMP6_MEMBERSHIP_REDUCTION: 280 printf("type=Multicast Listener Done, "); 281 break; 282 } 283 printf("addr=%s\n", inet_ntop(AF_INET6, &mld->mld6_addr, 284 ntop_buf, sizeof(ntop_buf))); 285 286 fflush(stdout); 287 } 288 289 /* ARGSUSED */ 290 static void 291 quit(int signum) { 292 mreq.ipv6mr_multiaddr = any; 293 mreq.ipv6mr_interface = ifindex; 294 if (setsockopt(sock, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq, 295 sizeof(mreq)) == -1) 296 err(1, "setsockopt(IPV6_LEAVE_GROUP)"); 297 298 exit(0); 299 } 300 301 static void 302 usage(void) 303 { 304 (void)fprintf(stderr, "usage: %s [-dr] ifname [addr]\n", getprogname()); 305 exit(1); 306 } 307
Indexes created Sat Sep 20 22:09:52 GMT 2025