usr.sbin/rtadvd/if.c

   1 /*      $FreeBSD$       */
   2 /*      $KAME: if.c,v 1.17 2001/01/21 15:27:30 itojun Exp $     */
   3
   4 /*
   5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   6  * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org>
   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/param.h>
  35 #include <sys/socket.h>
  36 #include <sys/sysctl.h>
  37 #include <sys/ioctl.h>
  38 #include <net/if.h>
  39 #include <net/if_dl.h>
  40 #include <net/if_types.h>
  41 #include <net/if_var.h>
  42 #include <net/ethernet.h>
  43 #include <net/route.h>
  44 #include <netinet/in.h>
  45 #include <netinet/in_var.h>
  46 #include <netinet/ip6.h>
  47 #include <netinet/icmp6.h>
  48 #include <netinet6/nd6.h>
  49 #include <unistd.h>
  50 #include <errno.h>
  51 #include <netdb.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <syslog.h>
  55
  56 #include "pathnames.h"
  57 #include "rtadvd.h"
  58 #include "if.h"
  59
  60 #define ROUNDUP(a, size)                                        \
  61         (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
  62
  63 #define NEXT_SA(ap)                                                     \
  64         (ap) = (struct sockaddr *)((caddr_t)(ap) +                      \
  65             ((ap)->sa_len ? ROUNDUP((ap)->sa_len, sizeof(u_long)) :     \
  66             sizeof(u_long)))
  67
  68 struct sockaddr_in6 sin6_linklocal_allnodes = {
  69         .sin6_len =     sizeof(sin6_linklocal_allnodes),
  70         .sin6_family =  AF_INET6,
  71         .sin6_addr =    IN6ADDR_LINKLOCAL_ALLNODES_INIT,
  72 };
  73
  74 struct sockaddr_in6 sin6_linklocal_allrouters = {
  75         .sin6_len =     sizeof(sin6_linklocal_allrouters),
  76         .sin6_family =  AF_INET6,
  77         .sin6_addr =    IN6ADDR_LINKLOCAL_ALLROUTERS_INIT,
  78 };
  79
  80 struct sockaddr_in6 sin6_sitelocal_allrouters = {
  81         .sin6_len =     sizeof(sin6_sitelocal_allrouters),
  82         .sin6_family =  AF_INET6,
  83         .sin6_addr =    IN6ADDR_SITELOCAL_ALLROUTERS_INIT,
  84 };
  85
  86 struct sockinfo sock = { .si_fd = -1, .si_name = NULL };
  87 struct sockinfo rtsock = { .si_fd = -1, .si_name = NULL };
  88 struct sockinfo ctrlsock = { .si_fd = -1, .si_name = _PATH_CTRL_SOCK };
  89
  90 char *mcastif;
  91
  92 static void             get_rtaddrs(int, struct sockaddr *,
  93                             struct sockaddr **);
  94 static struct if_msghdr *get_next_msghdr(struct if_msghdr *,
  95                             struct if_msghdr *);
  96
  97 static void
  98 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
  99 {
 100         int i;
 101
 102         for (i = 0; i < RTAX_MAX; i++) {
 103                 if (addrs & (1 << i)) {
 104                         rti_info[i] = sa;
 105                         NEXT_SA(sa);
 106                 }
 107                 else
 108                         rti_info[i] = NULL;
 109         }
 110 }
 111
 112 #define ROUNDUP8(a) (1 + (((a) - 1) | 7))
 113 int
 114 lladdropt_length(struct sockaddr_dl *sdl)
 115 {
 116         switch (sdl->sdl_type) {
 117         case IFT_ETHER:
 118                 return (ROUNDUP8(ETHER_ADDR_LEN + 2));
 119         default:
 120                 return (0);
 121         }
 122 }
 123
 124 void
 125 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
 126 {
 127         char *addr;
 128
 129         ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
 130
 131         switch (sdl->sdl_type) {
 132         case IFT_ETHER:
 133                 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
 134                 addr = (char *)(ndopt + 1);
 135                 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
 136                 break;
 137         default:
 138                 syslog(LOG_ERR, "<%s> unsupported link type(%d)",
 139                     __func__, sdl->sdl_type);
 140                 exit(1);
 141         }
 142
 143         return;
 144 }
 145
 146 int
 147 rtbuf_len(void)
 148 {
 149         size_t len;
 150         int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0};
 151
 152         if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
 153                 return (-1);
 154
 155         return (len);
 156 }
 157
 158 #define FILTER_MATCH(type, filter) ((0x1 << type) & filter)
 159 #define SIN6(s) ((struct sockaddr_in6 *)(s))
 160 #define SDL(s) ((struct sockaddr_dl *)(s))
 161 char *
 162 get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter)
 163 {
 164         struct rt_msghdr *rtm;
 165         struct ifa_msghdr *ifam;
 166         struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX];
 167
 168         *lenp = 0;
 169         for (rtm = (struct rt_msghdr *)buf;
 170              rtm < (struct rt_msghdr *)lim;
 171              rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) {
 172                 /* just for safety */
 173                 if (!rtm->rtm_msglen) {
 174                         syslog(LOG_WARNING, "<%s> rtm_msglen is 0 "
 175                             "(buf=%p lim=%p rtm=%p)", __func__,
 176                             buf, lim, rtm);
 177                         break;
 178                 }
 179                 if (((struct rt_msghdr *)buf)->rtm_version != RTM_VERSION) {
 180                         syslog(LOG_WARNING,
 181                             "<%s> routing message version mismatch "
 182                             "(buf=%p lim=%p rtm=%p)", __func__,
 183                             buf, lim, rtm);
 184                         continue;
 185                 }
 186
 187                 if (FILTER_MATCH(rtm->rtm_type, filter) == 0)
 188                         continue;
 189
 190                 switch (rtm->rtm_type) {
 191                 case RTM_GET:
 192                 case RTM_ADD:
 193                 case RTM_DELETE:
 194                         /* address related checks */
 195                         sa = (struct sockaddr *)(rtm + 1);
 196                         get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
 197                         if ((dst = rti_info[RTAX_DST]) == NULL ||
 198                             dst->sa_family != AF_INET6)
 199                                 continue;
 200
 201                         if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) ||
 202                             IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr))
 203                                 continue;
 204
 205                         if ((gw = rti_info[RTAX_GATEWAY]) == NULL ||
 206                             gw->sa_family != AF_LINK)
 207                                 continue;
 208                         if (ifindex && SDL(gw)->sdl_index != ifindex)
 209                                 continue;
 210
 211                         if (rti_info[RTAX_NETMASK] == NULL)
 212                                 continue;
 213
 214                         /* found */
 215                         *lenp = rtm->rtm_msglen;
 216                         return (char *)rtm;
 217                         /* NOTREACHED */
 218                 case RTM_NEWADDR:
 219                 case RTM_DELADDR:
 220                         ifam = (struct ifa_msghdr *)rtm;
 221
 222                         /* address related checks */
 223                         sa = (struct sockaddr *)(ifam + 1);
 224                         get_rtaddrs(ifam->ifam_addrs, sa, rti_info);
 225                         if ((ifa = rti_info[RTAX_IFA]) == NULL ||
 226                             (ifa->sa_family != AF_INET &&
 227                              ifa->sa_family != AF_INET6))
 228                                 continue;
 229
 230                         if (ifa->sa_family == AF_INET6 &&
 231                             (IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) ||
 232                              IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr)))
 233                                 continue;
 234
 235                         if (ifindex && ifam->ifam_index != ifindex)
 236                                 continue;
 237
 238                         /* found */
 239                         *lenp = ifam->ifam_msglen;
 240                         return (char *)rtm;
 241                         /* NOTREACHED */
 242                 case RTM_IFINFO:
 243                 case RTM_IFANNOUNCE:
 244                         /* found */
 245                         *lenp = rtm->rtm_msglen;
 246                         return (char *)rtm;
 247                         /* NOTREACHED */
 248                 }
 249         }
 250
 251         return ((char *)rtm);
 252 }
 253 #undef FILTER_MATCH
 254
 255 struct in6_addr *
 256 get_addr(char *buf)
 257 {
 258         struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
 259         struct sockaddr *sa, *rti_info[RTAX_MAX];
 260
 261         sa = (struct sockaddr *)(rtm + 1);
 262         get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
 263
 264         return (&SIN6(rti_info[RTAX_DST])->sin6_addr);
 265 }
 266
 267 int
 268 get_rtm_ifindex(char *buf)
 269 {
 270         struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
 271         struct sockaddr *sa, *rti_info[RTAX_MAX];
 272
 273         sa = (struct sockaddr *)(rtm + 1);
 274         get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
 275
 276         return (((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index);
 277 }
 278
 279 int
 280 get_prefixlen(char *buf)
 281 {
 282         struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
 283         struct sockaddr *sa, *rti_info[RTAX_MAX];
 284         char *p, *lim;
 285
 286         sa = (struct sockaddr *)(rtm + 1);
 287         get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
 288         sa = rti_info[RTAX_NETMASK];
 289
 290         p = (char *)(&SIN6(sa)->sin6_addr);
 291         lim = (char *)sa + sa->sa_len;
 292         return prefixlen(p, lim);
 293 }
 294
 295 int
 296 prefixlen(unsigned char *p, unsigned char *lim)
 297 {
 298         int masklen;
 299
 300         for (masklen = 0; p < lim; p++) {
 301                 switch (*p) {
 302                 case 0xff:
 303                         masklen += 8;
 304                         break;
 305                 case 0xfe:
 306                         masklen += 7;
 307                         break;
 308                 case 0xfc:
 309                         masklen += 6;
 310                         break;
 311                 case 0xf8:
 312                         masklen += 5;
 313                         break;
 314                 case 0xf0:
 315                         masklen += 4;
 316                         break;
 317                 case 0xe0:
 318                         masklen += 3;
 319                         break;
 320                 case 0xc0:
 321                         masklen += 2;
 322                         break;
 323                 case 0x80:
 324                         masklen += 1;
 325                         break;
 326                 case 0x00:
 327                         break;
 328                 default:
 329                         return (-1);
 330                 }
 331         }
 332
 333         return (masklen);
 334 }
 335
 336 struct ifinfo *
 337 update_persist_ifinfo(struct ifilist_head_t *ifi_head, const char *ifname)
 338 {
 339         struct ifinfo *ifi;
 340         int ifindex;
 341
 342         ifi = NULL;
 343         ifindex = if_nametoindex(ifname);
 344         TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
 345                 if (ifindex != 0) {
 346                         if (ifindex == ifi->ifi_ifindex)
 347                                 break;
 348                 } else {
 349                         if (strncmp(ifname, ifi->ifi_ifname,
 350                                 sizeof(ifi->ifi_ifname)) == 0)
 351                                 break;
 352                 }
 353         }
 354
 355         if (ifi == NULL) {
 356                 /* A new ifinfo element is needed. */
 357                 syslog(LOG_DEBUG, "<%s> new entry: %s", __func__,
 358                     ifname);
 359
 360                 ELM_MALLOC(ifi, exit(1));
 361                 ifi->ifi_ifindex = 0;
 362                 strlcpy(ifi->ifi_ifname, ifname, sizeof(ifi->ifi_ifname));
 363                 ifi->ifi_rainfo = NULL;
 364                 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
 365                 TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next);
 366         }
 367
 368         ifi->ifi_persist = 1;
 369
 370         syslog(LOG_DEBUG, "<%s> %s is marked PERSIST", __func__,
 371             ifi->ifi_ifname);
 372         syslog(LOG_DEBUG, "<%s> %s is state = %d", __func__,
 373             ifi->ifi_ifname, ifi->ifi_state);
 374         return (ifi);
 375 }
 376
 377 int
 378 update_ifinfo_nd_flags(struct ifinfo *ifi)
 379 {
 380         struct in6_ndireq nd;
 381         int s;
 382         int error;
 383
 384         if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 385                 syslog(LOG_ERR,
 386                     "<%s> socket() failed.", __func__);
 387                 return (1);
 388         }
 389         /* ND flags */
 390         memset(&nd, 0, sizeof(nd));
 391         strncpy(nd.ifname, ifi->ifi_ifname,
 392             sizeof(nd.ifname));
 393         error = ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd);
 394         if (error) {
 395                 close(s);
 396                 if (errno != EPFNOSUPPORT)
 397                         syslog(LOG_ERR, "<%s> ioctl() failed.", __func__);
 398                 return (1);
 399         }
 400         ifi->ifi_nd_flags = nd.ndi.flags;
 401         close(s);
 402
 403         return (0);
 404 }
 405
 406 struct ifinfo *
 407 update_ifinfo(struct ifilist_head_t *ifi_head, int ifindex)
 408 {
 409         struct if_msghdr *ifm;
 410         struct ifinfo *ifi = NULL;
 411         struct sockaddr *sa;
 412         struct sockaddr *rti_info[RTAX_MAX];
 413         char *msg;
 414         size_t len;
 415         char *lim;
 416         int mib[] = { CTL_NET, PF_ROUTE, 0, AF_INET6, NET_RT_IFLIST, 0 };
 417         int error;
 418
 419         syslog(LOG_DEBUG, "<%s> enter", __func__);
 420
 421         if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), NULL, &len, NULL, 0) <
 422             0) {
 423                 syslog(LOG_ERR,
 424                     "<%s> sysctl: NET_RT_IFLIST size get failed", __func__);
 425                 exit(1);
 426         }
 427         if ((msg = malloc(len)) == NULL) {
 428                 syslog(LOG_ERR, "<%s> malloc failed", __func__);
 429                 exit(1);
 430         }
 431         if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), msg, &len, NULL, 0) <
 432             0) {
 433                 syslog(LOG_ERR,
 434                     "<%s> sysctl: NET_RT_IFLIST get failed", __func__);
 435                 exit(1);
 436         }
 437
 438         lim = msg + len;
 439         for (ifm = (struct if_msghdr *)msg;
 440              ifm != NULL && ifm < (struct if_msghdr *)lim;
 441              ifm = get_next_msghdr(ifm,(struct if_msghdr *)lim)) {
 442                 int ifi_new;
 443
 444                 syslog(LOG_DEBUG, "<%s> ifm = %p, lim = %p, diff = %zu",
 445                     __func__, ifm, lim, (char *)lim - (char *)ifm);
 446
 447                 if (ifm->ifm_version != RTM_VERSION) {
 448                         syslog(LOG_ERR,
 449                             "<%s> ifm_vesrion mismatch", __func__);
 450                         exit(1);
 451                 }
 452                 if (ifm->ifm_msglen == 0) {
 453                         syslog(LOG_WARNING,
 454                             "<%s> ifm_msglen is 0", __func__);
 455                         free(msg);
 456                         return (NULL);
 457                 }
 458
 459                 ifi_new = 0;
 460                 if (ifm->ifm_type == RTM_IFINFO) {
 461                         struct ifreq ifr;
 462                         int s;
 463                         char ifname[IFNAMSIZ];
 464
 465                         syslog(LOG_DEBUG, "<%s> RTM_IFINFO found. "
 466                             "ifm_index = %d, ifindex = %d",
 467                             __func__, ifm->ifm_index, ifindex);
 468
 469                         /* when ifindex is specified */
 470                         if (ifindex != UPDATE_IFINFO_ALL &&
 471                             ifindex != ifm->ifm_index)
 472                                 continue;
 473
 474                         /* lookup an entry with the same ifindex */
 475                         TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
 476                                 if (ifm->ifm_index == ifi->ifi_ifindex)
 477                                         break;
 478                                 if_indextoname(ifm->ifm_index, ifname);
 479                                 if (strncmp(ifname, ifi->ifi_ifname,
 480                                         sizeof(ifname)) == 0)
 481                                         break;
 482                         }
 483                         if (ifi == NULL) {
 484                                 syslog(LOG_DEBUG,
 485                                     "<%s> new entry for idx=%d",
 486                                     __func__, ifm->ifm_index);
 487                                 ELM_MALLOC(ifi, exit(1));
 488                                 ifi->ifi_rainfo = NULL;
 489                                 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
 490                                 ifi->ifi_persist = 0;
 491                                 ifi_new = 1;
 492                         }
 493                         /* ifindex */
 494                         ifi->ifi_ifindex = ifm->ifm_index;
 495
 496                         /* ifname */
 497                         if_indextoname(ifm->ifm_index, ifi->ifi_ifname);
 498                         if (ifi->ifi_ifname == NULL) {
 499                                 syslog(LOG_WARNING,
 500                                     "<%s> ifname not found (idx=%d)",
 501                                     __func__, ifm->ifm_index);
 502                                 if (ifi_new)
 503                                         free(ifi);
 504                                 continue;
 505                         }
 506
 507                         if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 508                                 syslog(LOG_ERR,
 509                                     "<%s> socket() failed.", __func__);
 510                                 if (ifi_new)
 511                                         free(ifi);
 512                                 continue;
 513                         }
 514
 515                         /* MTU  */
 516                         ifi->ifi_phymtu = ifm->ifm_data.ifi_mtu;
 517                         if (ifi->ifi_phymtu == 0) {
 518                                 memset(&ifr, 0, sizeof(ifr));
 519                                 ifr.ifr_addr.sa_family = AF_INET6;
 520                                 strncpy(ifr.ifr_name, ifi->ifi_ifname,
 521                                     sizeof(ifr.ifr_name));
 522                                 error = ioctl(s, SIOCGIFMTU, (caddr_t)&ifr);
 523                                 if (error) {
 524                                         close(s);
 525                                         syslog(LOG_ERR,
 526                                             "<%s> ioctl() failed.",
 527                                             __func__);
 528                                         if (ifi_new)
 529                                                 free(ifi);
 530                                         continue;
 531                                 }
 532                                 ifi->ifi_phymtu = ifr.ifr_mtu;
 533                                 if (ifi->ifi_phymtu == 0) {
 534                                         syslog(LOG_WARNING,
 535                                             "<%s> no interface mtu info"
 536                                             " on %s.  %d will be used.",
 537                                             __func__, ifi->ifi_ifname,
 538                                             IPV6_MMTU);
 539                                         ifi->ifi_phymtu = IPV6_MMTU;
 540                                 }
 541                         }
 542                         close(s);
 543
 544                         /* ND flags */
 545                         error = update_ifinfo_nd_flags(ifi);
 546                         if (error) {
 547                                 if (ifi_new)
 548                                         free(ifi);
 549                                 continue;
 550                         }
 551
 552                         /* SDL */
 553                         sa = (struct sockaddr *)(ifm + 1);
 554                         get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
 555                         if ((sa = rti_info[RTAX_IFP]) != NULL) {
 556                                 if (sa->sa_family == AF_LINK) {
 557                                         memcpy(&ifi->ifi_sdl,
 558                                             (struct sockaddr_dl *)sa,
 559                                             sizeof(ifi->ifi_sdl));
 560                                 }
 561                         } else
 562                                 memset(&ifi->ifi_sdl, 0,
 563                                     sizeof(ifi->ifi_sdl));
 564
 565                         /* flags */
 566                         ifi->ifi_flags = ifm->ifm_flags;
 567
 568                         /* type */
 569                         ifi->ifi_type = ifm->ifm_type;
 570                 } else {
 571                         syslog(LOG_ERR,
 572                             "out of sync parsing NET_RT_IFLIST\n"
 573                             "expected %d, got %d\n msglen = %d\n",
 574                             RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen);
 575                         exit(1);
 576                 }
 577
 578                 if (ifi_new) {
 579                         syslog(LOG_DEBUG,
 580                             "<%s> adding %s(idx=%d) to ifilist",
 581                             __func__, ifi->ifi_ifname, ifi->ifi_ifindex);
 582                         TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next);
 583                 }
 584         }
 585         free(msg);
 586
 587         if (mcastif != NULL) {
 588                 error = sock_mc_rr_update(&sock, mcastif);
 589                 if (error)
 590                         exit(1);
 591         }
 592
 593         return (ifi);
 594 }
 595
 596 static struct if_msghdr *
 597 get_next_msghdr(struct if_msghdr *ifm, struct if_msghdr *lim)
 598 {
 599         struct ifa_msghdr *ifam;
 600
 601         for (ifam = (struct ifa_msghdr *)((char *)ifm + ifm->ifm_msglen);
 602              ifam < (struct ifa_msghdr *)lim;
 603              ifam = (struct ifa_msghdr *)((char *)ifam + ifam->ifam_msglen)) {
 604                 if (!ifam->ifam_msglen) {
 605                         syslog(LOG_WARNING,
 606                             "<%s> ifa_msglen is 0", __func__);
 607                         return (NULL);
 608                 }
 609                 if (ifam->ifam_type != RTM_NEWADDR)
 610                         break;
 611         }
 612
 613         return ((struct if_msghdr *)ifam);
 614 }
 615
 616 int
 617 getinet6sysctl(int code)
 618 {
 619         int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
 620         int value;
 621         size_t size;
 622
 623         mib[3] = code;
 624         size = sizeof(value);
 625         if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0)
 626             < 0) {
 627                 syslog(LOG_ERR, "<%s>: failed to get ip6 sysctl(%d): %s",
 628                     __func__, code,
 629                     strerror(errno));
 630                 return (-1);
 631         }
 632         else
 633                 return (value);
 634 }
 635
 636
 637 int
 638 sock_mc_join(struct sockinfo *s, int ifindex)
 639 {
 640         struct ipv6_mreq mreq;
 641         char ifname[IFNAMSIZ];
 642
 643         syslog(LOG_DEBUG, "<%s> enter", __func__);
 644
 645         if (ifindex == 0)
 646                 return (1);
 647
 648         /*
 649          * join all routers multicast address on each advertising
 650          * interface.
 651          */
 652         memset(&mreq, 0, sizeof(mreq));
 653         /* XXX */
 654         memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
 655             &sin6_linklocal_allrouters.sin6_addr,
 656             sizeof(mreq.ipv6mr_multiaddr.s6_addr));
 657
 658         mreq.ipv6mr_interface = ifindex;
 659         if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
 660                 sizeof(mreq)) < 0) {
 661                 syslog(LOG_ERR,
 662                     "<%s> IPV6_JOIN_GROUP(link) on %s: %s",
 663                     __func__, if_indextoname(ifindex, ifname),
 664                     strerror(errno));
 665                 return (1);
 666         }
 667         syslog(LOG_DEBUG,
 668             "<%s> %s: join link-local all-routers MC group",
 669             __func__, if_indextoname(ifindex, ifname));
 670
 671         return (0);
 672 }
 673
 674 int
 675 sock_mc_leave(struct sockinfo *s, int ifindex)
 676 {
 677         struct ipv6_mreq mreq;
 678         char ifname[IFNAMSIZ];
 679
 680         syslog(LOG_DEBUG, "<%s> enter", __func__);
 681
 682         if (ifindex == 0)
 683                 return (1);
 684
 685         /*
 686          * join all routers multicast address on each advertising
 687          * interface.
 688          */
 689
 690         memset(&mreq, 0, sizeof(mreq));
 691         /* XXX */
 692         memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
 693             &sin6_linklocal_allrouters.sin6_addr,
 694             sizeof(mreq.ipv6mr_multiaddr.s6_addr));
 695
 696         mreq.ipv6mr_interface = ifindex;
 697         if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq,
 698                 sizeof(mreq)) < 0) {
 699                 syslog(LOG_ERR,
 700                     "<%s> IPV6_JOIN_LEAVE(link) on %s: %s",
 701                     __func__, if_indextoname(ifindex, ifname),
 702                     strerror(errno));
 703                 return (1);
 704         }
 705         syslog(LOG_DEBUG,
 706             "<%s> %s: leave link-local all-routers MC group",
 707             __func__, if_indextoname(ifindex, ifname));
 708
 709         return (0);
 710 }
 711
 712 int
 713 sock_mc_rr_update(struct sockinfo *s, char *mif)
 714 {
 715         struct ipv6_mreq mreq;
 716
 717         syslog(LOG_DEBUG, "<%s> enter", __func__);
 718
 719         if (mif == NULL)
 720                 return (1);
 721         /*
 722          * When attending router renumbering, join all-routers site-local
 723          * multicast group.
 724          */
 725         /* XXX */
 726         memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
 727             &sin6_sitelocal_allrouters.sin6_addr,
 728             sizeof(mreq.ipv6mr_multiaddr.s6_addr));
 729         if ((mreq.ipv6mr_interface = if_nametoindex(mif)) == 0) {
 730                 syslog(LOG_ERR,
 731                     "<%s> invalid interface: %s",
 732                     __func__, mif);
 733                 return (1);
 734         }
 735
 736         if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP,
 737                 &mreq, sizeof(mreq)) < 0) {
 738                 syslog(LOG_ERR,
 739                     "<%s> IPV6_JOIN_GROUP(site) on %s: %s",
 740                     __func__, mif, strerror(errno));
 741                 return (1);
 742         }
 743
 744         syslog(LOG_DEBUG,
 745             "<%s> %s: join site-local all-routers MC group",
 746             __func__, mif);
 747
 748         return (0);
 749 }