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  * SPDX-License-Identifier: BSD-3-Clause
   6  *
   7  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   8  * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org>
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the project nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/param.h>
  37 #include <sys/socket.h>
  38 #include <sys/sysctl.h>
  39 #include <sys/ioctl.h>
  40 #include <net/if.h>
  41 #include <net/if_dl.h>
  42 #include <net/if_types.h>
  43 #include <net/ethernet.h>
  44 #include <net/route.h>
  45 #include <netinet/in.h>
  46 #include <netinet/in_var.h>
  47 #include <netinet/ip6.h>
  48 #include <netinet/icmp6.h>
  49 #include <netinet6/nd6.h>
  50 #include <unistd.h>
  51 #include <errno.h>
  52 #include <netdb.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55 #include <syslog.h>
  56
  57 #include "pathnames.h"
  58 #include "rtadvd.h"
  59 #include "if.h"
  60
  61 #define ROUNDUP(a, size)                                        \
  62         (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
  63
  64 #define NEXT_SA(ap)                                                     \
  65         (ap) = (struct sockaddr *)((caddr_t)(ap) +                      \
  66             ((ap)->sa_len ? ROUNDUP((ap)->sa_len, sizeof(u_long)) :     \
  67             sizeof(u_long)))
  68
  69 struct sockaddr_in6 sin6_linklocal_allnodes = {
  70         .sin6_len =     sizeof(sin6_linklocal_allnodes),
  71         .sin6_family =  AF_INET6,
  72         .sin6_addr =    IN6ADDR_LINKLOCAL_ALLNODES_INIT,
  73 };
  74
  75 struct sockaddr_in6 sin6_linklocal_allrouters = {
  76         .sin6_len =     sizeof(sin6_linklocal_allrouters),
  77         .sin6_family =  AF_INET6,
  78         .sin6_addr =    IN6ADDR_LINKLOCAL_ALLROUTERS_INIT,
  79 };
  80
  81 struct sockaddr_in6 sin6_sitelocal_allrouters = {
  82         .sin6_len =     sizeof(sin6_sitelocal_allrouters),
  83         .sin6_family =  AF_INET6,
  84         .sin6_addr =    IN6ADDR_SITELOCAL_ALLROUTERS_INIT,
  85 };
  86
  87 struct sockinfo sock = { .si_fd = -1, .si_name = NULL };
  88 struct sockinfo rtsock = { .si_fd = -1, .si_name = NULL };
  89 struct sockinfo ctrlsock = { .si_fd = -1, .si_name = _PATH_CTRL_SOCK };
  90
  91 char *mcastif;
  92
  93 static void             get_rtaddrs(int, struct sockaddr *,
  94                             struct sockaddr **);
  95 static struct if_msghdr *get_next_msghdr(struct if_msghdr *,
  96                             struct if_msghdr *);
  97
  98 static void
  99 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
 100 {
 101         int i;
 102
 103         for (i = 0; i < RTAX_MAX; i++) {
 104                 if (addrs & (1 << i)) {
 105                         rti_info[i] = sa;
 106                         NEXT_SA(sa);
 107                 }
 108                 else
 109                         rti_info[i] = NULL;
 110         }
 111 }
 112
 113 #define ROUNDUP8(a) (1 + (((a) - 1) | 7))
 114 int
 115 lladdropt_length(struct sockaddr_dl *sdl)
 116 {
 117         switch (sdl->sdl_type) {
 118         case IFT_ETHER:
 119         case IFT_L2VLAN:
 120         case IFT_BRIDGE:
 121                 return (ROUNDUP8(ETHER_ADDR_LEN + 2));
 122         default:
 123                 return (0);
 124         }
 125 }
 126
 127 void
 128 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
 129 {
 130         char *addr;
 131
 132         ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
 133
 134         switch (sdl->sdl_type) {
 135         case IFT_ETHER:
 136         case IFT_L2VLAN:
 137         case IFT_BRIDGE:
 138                 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
 139                 addr = (char *)(ndopt + 1);
 140                 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
 141                 break;
 142         default:
 143                 syslog(LOG_ERR, "<%s> unsupported link type(%d)",
 144                     __func__, sdl->sdl_type);
 145                 exit(1);
 146         }
 147
 148         return;
 149 }
 150
 151 int
 152 rtbuf_len(void)
 153 {
 154         size_t len;
 155         int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0};
 156
 157         if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
 158                 return (-1);
 159
 160         return (len);
 161 }
 162
 163 #define FILTER_MATCH(type, filter) ((0x1 << type) & filter)
 164 #define SIN6(s) ((struct sockaddr_in6 *)(s))
 165 #define SDL(s) ((struct sockaddr_dl *)(s))
 166 char *
 167 get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter)
 168 {
 169         struct rt_msghdr *rtm;
 170         struct ifa_msghdr *ifam;
 171         struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX];
 172
 173         *lenp = 0;
 174         for (rtm = (struct rt_msghdr *)buf;
 175              rtm < (struct rt_msghdr *)lim;
 176              rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) {
 177                 /* just for safety */
 178                 if (!rtm->rtm_msglen) {
 179                         syslog(LOG_WARNING, "<%s> rtm_msglen is 0 "
 180                             "(buf=%p lim=%p rtm=%p)", __func__,
 181                             buf, lim, rtm);
 182                         break;
 183                 }
 184                 if (((struct rt_msghdr *)buf)->rtm_version != RTM_VERSION) {
 185                         syslog(LOG_WARNING,
 186                             "<%s> routing message version mismatch "
 187                             "(buf=%p lim=%p rtm=%p)", __func__,
 188                             buf, lim, rtm);
 189                         continue;
 190                 }
 191
 192                 if (FILTER_MATCH(rtm->rtm_type, filter) == 0)
 193                         continue;
 194
 195                 switch (rtm->rtm_type) {
 196                 case RTM_GET:
 197                 case RTM_ADD:
 198                 case RTM_DELETE:
 199                         /* address related checks */
 200                         sa = (struct sockaddr *)(rtm + 1);
 201                         get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
 202                         if ((dst = rti_info[RTAX_DST]) == NULL ||
 203                             dst->sa_family != AF_INET6)
 204                                 continue;
 205
 206                         if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) ||
 207                             IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr))
 208                                 continue;
 209
 210                         if ((gw = rti_info[RTAX_GATEWAY]) == NULL ||
 211                             gw->sa_family != AF_LINK)
 212                                 continue;
 213                         if (ifindex && SDL(gw)->sdl_index != ifindex)
 214                                 continue;
 215
 216                         if (rti_info[RTAX_NETMASK] == NULL)
 217                                 continue;
 218
 219                         /* found */
 220                         *lenp = rtm->rtm_msglen;
 221                         return (char *)rtm;
 222                         /* NOTREACHED */
 223                 case RTM_NEWADDR:
 224                 case RTM_DELADDR:
 225                         ifam = (struct ifa_msghdr *)rtm;
 226
 227                         /* address related checks */
 228                         sa = (struct sockaddr *)(ifam + 1);
 229                         get_rtaddrs(ifam->ifam_addrs, sa, rti_info);
 230                         if ((ifa = rti_info[RTAX_IFA]) == NULL ||
 231                             (ifa->sa_family != AF_INET &&
 232                              ifa->sa_family != AF_INET6))
 233                                 continue;
 234
 235                         if (ifa->sa_family == AF_INET6 &&
 236                             (IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) ||
 237                              IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr)))
 238                                 continue;
 239
 240                         if (ifindex && ifam->ifam_index != ifindex)
 241                                 continue;
 242
 243                         /* found */
 244                         *lenp = ifam->ifam_msglen;
 245                         return (char *)rtm;
 246                         /* NOTREACHED */
 247                 case RTM_IFINFO:
 248                 case RTM_IFANNOUNCE:
 249                         /* found */
 250                         *lenp = rtm->rtm_msglen;
 251                         return (char *)rtm;
 252                         /* NOTREACHED */
 253                 }
 254         }
 255
 256         return ((char *)rtm);
 257 }
 258 #undef FILTER_MATCH
 259
 260 struct in6_addr *
 261 get_addr(char *buf)
 262 {
 263         struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
 264         struct sockaddr *sa, *rti_info[RTAX_MAX];
 265
 266         sa = (struct sockaddr *)(rtm + 1);
 267         get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
 268
 269         return (&SIN6(rti_info[RTAX_DST])->sin6_addr);
 270 }
 271
 272 int
 273 get_rtm_ifindex(char *buf)
 274 {
 275         struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
 276         struct sockaddr *sa, *rti_info[RTAX_MAX];
 277
 278         sa = (struct sockaddr *)(rtm + 1);
 279         get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
 280
 281         return (((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index);
 282 }
 283
 284 int
 285 get_prefixlen(char *buf)
 286 {
 287         struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
 288         struct sockaddr *sa, *rti_info[RTAX_MAX];
 289         char *p, *lim;
 290
 291         sa = (struct sockaddr *)(rtm + 1);
 292         get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
 293         sa = rti_info[RTAX_NETMASK];
 294
 295         p = (char *)(&SIN6(sa)->sin6_addr);
 296         lim = (char *)sa + sa->sa_len;
 297         return prefixlen(p, lim);
 298 }
 299
 300 int
 301 prefixlen(unsigned char *p, unsigned char *lim)
 302 {
 303         int masklen;
 304
 305         for (masklen = 0; p < lim; p++) {
 306                 switch (*p) {
 307                 case 0xff:
 308                         masklen += 8;
 309                         break;
 310                 case 0xfe:
 311                         masklen += 7;
 312                         break;
 313                 case 0xfc:
 314                         masklen += 6;
 315                         break;
 316                 case 0xf8:
 317                         masklen += 5;
 318                         break;
 319                 case 0xf0:
 320                         masklen += 4;
 321                         break;
 322                 case 0xe0:
 323                         masklen += 3;
 324                         break;
 325                 case 0xc0:
 326                         masklen += 2;
 327                         break;
 328                 case 0x80:
 329                         masklen += 1;
 330                         break;
 331                 case 0x00:
 332                         break;
 333                 default:
 334                         return (-1);
 335                 }
 336         }
 337
 338         return (masklen);
 339 }
 340
 341 struct ifinfo *
 342 update_persist_ifinfo(struct ifilist_head_t *ifi_head, const char *ifname)
 343 {
 344         struct ifinfo *ifi;
 345         int ifindex;
 346
 347         ifi = NULL;
 348         ifindex = if_nametoindex(ifname);
 349         TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
 350                 if (ifindex != 0) {
 351                         if (ifindex == ifi->ifi_ifindex)
 352                                 break;
 353                 } else {
 354                         if (strncmp(ifname, ifi->ifi_ifname,
 355                                 sizeof(ifi->ifi_ifname)) == 0)
 356                                 break;
 357                 }
 358         }
 359
 360         if (ifi == NULL) {
 361                 /* A new ifinfo element is needed. */
 362                 syslog(LOG_DEBUG, "<%s> new entry: %s", __func__,
 363                     ifname);
 364
 365                 ELM_MALLOC(ifi, exit(1));
 366                 ifi->ifi_ifindex = 0;
 367                 strlcpy(ifi->ifi_ifname, ifname, sizeof(ifi->ifi_ifname));
 368                 ifi->ifi_rainfo = NULL;
 369                 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
 370                 TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next);
 371         }
 372
 373         ifi->ifi_persist = 1;
 374
 375         syslog(LOG_DEBUG, "<%s> %s is marked PERSIST", __func__,
 376             ifi->ifi_ifname);
 377         syslog(LOG_DEBUG, "<%s> %s is state = %d", __func__,
 378             ifi->ifi_ifname, ifi->ifi_state);
 379         return (ifi);
 380 }
 381
 382 int
 383 update_ifinfo_nd_flags(struct ifinfo *ifi)
 384 {
 385         struct in6_ndireq nd;
 386         int s;
 387         int error;
 388
 389         if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 390                 syslog(LOG_ERR,
 391                     "<%s> socket() failed.", __func__);
 392                 return (1);
 393         }
 394         /* ND flags */
 395         memset(&nd, 0, sizeof(nd));
 396         strlcpy(nd.ifname, ifi->ifi_ifname,
 397             sizeof(nd.ifname));
 398         error = ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd);
 399         if (error) {
 400                 close(s);
 401                 if (errno != EPFNOSUPPORT)
 402                         syslog(LOG_ERR, "<%s> ioctl() failed.", __func__);
 403                 return (1);
 404         }
 405         ifi->ifi_nd_flags = nd.ndi.flags;
 406         close(s);
 407
 408         return (0);
 409 }
 410
 411 struct ifinfo *
 412 update_ifinfo(struct ifilist_head_t *ifi_head, int ifindex)
 413 {
 414         struct if_msghdr *ifm;
 415         struct ifinfo *ifi = NULL;
 416         struct sockaddr *sa;
 417         struct sockaddr *rti_info[RTAX_MAX];
 418         char *msg;
 419         size_t len;
 420         char *lim;
 421         int mib[] = { CTL_NET, PF_ROUTE, 0, AF_INET6, NET_RT_IFLIST, 0 };
 422         int error;
 423
 424         syslog(LOG_DEBUG, "<%s> enter", __func__);
 425
 426         if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), NULL, &len, NULL, 0) <
 427             0) {
 428                 syslog(LOG_ERR,
 429                     "<%s> sysctl: NET_RT_IFLIST size get failed", __func__);
 430                 exit(1);
 431         }
 432         if ((msg = malloc(len)) == NULL) {
 433                 syslog(LOG_ERR, "<%s> malloc failed", __func__);
 434                 exit(1);
 435         }
 436         if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), msg, &len, NULL, 0) <
 437             0) {
 438                 syslog(LOG_ERR,
 439                     "<%s> sysctl: NET_RT_IFLIST get failed", __func__);
 440                 exit(1);
 441         }
 442
 443         lim = msg + len;
 444         for (ifm = (struct if_msghdr *)msg;
 445              ifm != NULL && ifm < (struct if_msghdr *)lim;
 446              ifm = get_next_msghdr(ifm,(struct if_msghdr *)lim)) {
 447                 int ifi_new;
 448
 449                 syslog(LOG_DEBUG, "<%s> ifm = %p, lim = %p, diff = %zu",
 450                     __func__, ifm, lim, (char *)lim - (char *)ifm);
 451
 452                 if (ifm->ifm_version != RTM_VERSION) {
 453                         syslog(LOG_ERR,
 454                             "<%s> ifm_vesrion mismatch", __func__);
 455                         exit(1);
 456                 }
 457                 if (ifm->ifm_msglen == 0) {
 458                         syslog(LOG_WARNING,
 459                             "<%s> ifm_msglen is 0", __func__);
 460                         free(msg);
 461                         return (NULL);
 462                 }
 463
 464                 ifi_new = 0;
 465                 if (ifm->ifm_type == RTM_IFINFO) {
 466                         struct ifreq ifr;
 467                         int s;
 468                         char ifname[IFNAMSIZ];
 469
 470                         syslog(LOG_DEBUG, "<%s> RTM_IFINFO found. "
 471                             "ifm_index = %d, ifindex = %d",
 472                             __func__, ifm->ifm_index, ifindex);
 473
 474                         /* when ifindex is specified */
 475                         if (ifindex != UPDATE_IFINFO_ALL &&
 476                             ifindex != ifm->ifm_index)
 477                                 continue;
 478
 479                         /* ifname */
 480                         if (if_indextoname(ifm->ifm_index, ifname) == NULL) {
 481                                 syslog(LOG_WARNING,
 482                                     "<%s> ifname not found (idx=%d)",
 483                                     __func__, ifm->ifm_index);
 484                                 continue;
 485                         }
 486
 487                         /* lookup an entry with the same ifindex */
 488                         TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
 489                                 if (ifm->ifm_index == ifi->ifi_ifindex)
 490                                         break;
 491                                 if (strncmp(ifname, ifi->ifi_ifname,
 492                                         sizeof(ifname)) == 0)
 493                                         break;
 494                         }
 495                         if (ifi == NULL) {
 496                                 syslog(LOG_DEBUG,
 497                                     "<%s> new entry for idx=%d",
 498                                     __func__, ifm->ifm_index);
 499                                 ELM_MALLOC(ifi, exit(1));
 500                                 ifi->ifi_rainfo = NULL;
 501                                 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
 502                                 ifi->ifi_persist = 0;
 503                                 ifi_new = 1;
 504                         }
 505                         /* ifindex */
 506                         ifi->ifi_ifindex = ifm->ifm_index;
 507
 508                         /* ifname */
 509                         strlcpy(ifi->ifi_ifname, ifname, IFNAMSIZ);
 510
 511                         if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 512                                 syslog(LOG_ERR,
 513                                     "<%s> socket() failed.", __func__);
 514                                 if (ifi_new)
 515                                         free(ifi);
 516                                 continue;
 517                         }
 518
 519                         /* MTU  */
 520                         ifi->ifi_phymtu = ifm->ifm_data.ifi_mtu;
 521                         if (ifi->ifi_phymtu == 0) {
 522                                 memset(&ifr, 0, sizeof(ifr));
 523                                 ifr.ifr_addr.sa_family = AF_INET6;
 524                                 strlcpy(ifr.ifr_name, ifi->ifi_ifname,
 525                                     sizeof(ifr.ifr_name));
 526                                 error = ioctl(s, SIOCGIFMTU, (caddr_t)&ifr);
 527                                 if (error) {
 528                                         close(s);
 529                                         syslog(LOG_ERR,
 530                                             "<%s> ioctl() failed.",
 531                                             __func__);
 532                                         if (ifi_new)
 533                                                 free(ifi);
 534                                         continue;
 535                                 }
 536                                 ifi->ifi_phymtu = ifr.ifr_mtu;
 537                                 if (ifi->ifi_phymtu == 0) {
 538                                         syslog(LOG_WARNING,
 539                                             "<%s> no interface mtu info"
 540                                             " on %s.  %d will be used.",
 541                                             __func__, ifi->ifi_ifname,
 542                                             IPV6_MMTU);
 543                                         ifi->ifi_phymtu = IPV6_MMTU;
 544                                 }
 545                         }
 546                         close(s);
 547
 548                         /* ND flags */
 549                         error = update_ifinfo_nd_flags(ifi);
 550                         if (error) {
 551                                 if (ifi_new)
 552                                         free(ifi);
 553                                 continue;
 554                         }
 555
 556                         /* SDL */
 557                         sa = (struct sockaddr *)(ifm + 1);
 558                         get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
 559                         if ((sa = rti_info[RTAX_IFP]) != NULL) {
 560                                 if (sa->sa_family == AF_LINK) {
 561                                         memcpy(&ifi->ifi_sdl,
 562                                             (struct sockaddr_dl *)sa,
 563                                             sizeof(ifi->ifi_sdl));
 564                                 }
 565                         } else
 566                                 memset(&ifi->ifi_sdl, 0,
 567                                     sizeof(ifi->ifi_sdl));
 568
 569                         /* flags */
 570                         ifi->ifi_flags = ifm->ifm_flags;
 571
 572                         /* type */
 573                         ifi->ifi_type = ifm->ifm_type;
 574                 } else {
 575                         syslog(LOG_ERR,
 576                             "out of sync parsing NET_RT_IFLIST\n"
 577                             "expected %d, got %d\n msglen = %d\n",
 578                             RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen);
 579                         exit(1);
 580                 }
 581
 582                 if (ifi_new) {
 583                         syslog(LOG_DEBUG,
 584                             "<%s> adding %s(idx=%d) to ifilist",
 585                             __func__, ifi->ifi_ifname, ifi->ifi_ifindex);
 586                         TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next);
 587                 }
 588         }
 589         free(msg);
 590
 591         if (mcastif != NULL) {
 592                 error = sock_mc_rr_update(&sock, mcastif);
 593                 if (error)
 594                         exit(1);
 595         }
 596
 597         return (ifi);
 598 }
 599
 600 static struct if_msghdr *
 601 get_next_msghdr(struct if_msghdr *ifm, struct if_msghdr *lim)
 602 {
 603         struct ifa_msghdr *ifam;
 604
 605         for (ifam = (struct ifa_msghdr *)((char *)ifm + ifm->ifm_msglen);
 606              ifam < (struct ifa_msghdr *)lim;
 607              ifam = (struct ifa_msghdr *)((char *)ifam + ifam->ifam_msglen)) {
 608                 if (!ifam->ifam_msglen) {
 609                         syslog(LOG_WARNING,
 610                             "<%s> ifa_msglen is 0", __func__);
 611                         return (NULL);
 612                 }
 613                 if (ifam->ifam_type != RTM_NEWADDR)
 614                         break;
 615         }
 616
 617         return ((struct if_msghdr *)ifam);
 618 }
 619
 620 int
 621 getinet6sysctl(int code)
 622 {
 623         int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
 624         int value;
 625         size_t size;
 626
 627         mib[3] = code;
 628         size = sizeof(value);
 629         if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0)
 630             < 0) {
 631                 syslog(LOG_ERR, "<%s>: failed to get ip6 sysctl(%d): %s",
 632                     __func__, code,
 633                     strerror(errno));
 634                 return (-1);
 635         }
 636         else
 637                 return (value);
 638 }
 639
 640
 641 int
 642 sock_mc_join(struct sockinfo *s, int ifindex)
 643 {
 644         struct ipv6_mreq mreq;
 645         char ifname[IFNAMSIZ];
 646
 647         syslog(LOG_DEBUG, "<%s> enter", __func__);
 648
 649         if (ifindex == 0)
 650                 return (1);
 651
 652         /*
 653          * join all routers multicast address on each advertising
 654          * interface.
 655          */
 656         memset(&mreq, 0, sizeof(mreq));
 657         /* XXX */
 658         memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
 659             &sin6_linklocal_allrouters.sin6_addr,
 660             sizeof(mreq.ipv6mr_multiaddr.s6_addr));
 661
 662         mreq.ipv6mr_interface = ifindex;
 663         if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
 664                 sizeof(mreq)) < 0) {
 665                 syslog(LOG_ERR,
 666                     "<%s> IPV6_JOIN_GROUP(link) on %s: %s",
 667                     __func__, if_indextoname(ifindex, ifname),
 668                     strerror(errno));
 669                 return (1);
 670         }
 671         syslog(LOG_DEBUG,
 672             "<%s> %s: join link-local all-routers MC group",
 673             __func__, if_indextoname(ifindex, ifname));
 674
 675         return (0);
 676 }
 677
 678 int
 679 sock_mc_leave(struct sockinfo *s, int ifindex)
 680 {
 681         struct ipv6_mreq mreq;
 682         char ifname[IFNAMSIZ];
 683
 684         syslog(LOG_DEBUG, "<%s> enter", __func__);
 685
 686         if (ifindex == 0)
 687                 return (1);
 688
 689         /*
 690          * join all routers multicast address on each advertising
 691          * interface.
 692          */
 693
 694         memset(&mreq, 0, sizeof(mreq));
 695         /* XXX */
 696         memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
 697             &sin6_linklocal_allrouters.sin6_addr,
 698             sizeof(mreq.ipv6mr_multiaddr.s6_addr));
 699
 700         mreq.ipv6mr_interface = ifindex;
 701         if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq,
 702                 sizeof(mreq)) < 0) {
 703                 syslog(LOG_ERR,
 704                     "<%s> IPV6_JOIN_LEAVE(link) on %s: %s",
 705                     __func__, if_indextoname(ifindex, ifname),
 706                     strerror(errno));
 707                 return (1);
 708         }
 709         syslog(LOG_DEBUG,
 710             "<%s> %s: leave link-local all-routers MC group",
 711             __func__, if_indextoname(ifindex, ifname));
 712
 713         return (0);
 714 }
 715
 716 int
 717 sock_mc_rr_update(struct sockinfo *s, char *mif)
 718 {
 719         struct ipv6_mreq mreq;
 720
 721         syslog(LOG_DEBUG, "<%s> enter", __func__);
 722
 723         if (mif == NULL)
 724                 return (1);
 725         /*
 726          * When attending router renumbering, join all-routers site-local
 727          * multicast group.
 728          */
 729         /* XXX */
 730         memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
 731             &sin6_sitelocal_allrouters.sin6_addr,
 732             sizeof(mreq.ipv6mr_multiaddr.s6_addr));
 733         if ((mreq.ipv6mr_interface = if_nametoindex(mif)) == 0) {
 734                 syslog(LOG_ERR,
 735                     "<%s> invalid interface: %s",
 736                     __func__, mif);
 737                 return (1);
 738         }
 739
 740         if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP,
 741                 &mreq, sizeof(mreq)) < 0) {
 742                 syslog(LOG_ERR,
 743                     "<%s> IPV6_JOIN_GROUP(site) on %s: %s",
 744                     __func__, mif, strerror(errno));
 745                 return (1);
 746         }
 747
 748         syslog(LOG_DEBUG,
 749             "<%s> %s: join site-local all-routers MC group",
 750             __func__, mif);
 751
 752         return (0);
 753 }