usr.sbin/rtadvd/config.c

   1 /*      $KAME: config.c,v 1.37 2001/05/25 07:34:00 itojun 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  * $FreeBSD: src/usr.sbin/rtadvd/config.c,v 1.3.2.5 2003/04/22 09:40:57 suz Exp $
  32  * $DragonFly: src/usr.sbin/rtadvd/config.c,v 1.4 2004/02/10 02:59:43 rob Exp $
  33  */
  34
  35 #include <sys/param.h>
  36 #include <sys/ioctl.h>
  37 #include <sys/socket.h>
  38 #include <sys/time.h>
  39 #include <sys/sysctl.h>
  40
  41 #include <net/if.h>
  42 #if defined(__DragonFly__)
  43 #include <net/if_var.h>
  44 #endif /* __DragonFly__  */
  45 #include <net/route.h>
  46 #include <net/if_dl.h>
  47
  48 #include <netinet/in.h>
  49 #include <netinet/in_var.h>
  50 #include <netinet/ip6.h>
  51 #include <netinet6/ip6_var.h>
  52 #include <netinet/icmp6.h>
  53 #ifdef MIP6
  54 #include <netinet6/mip6.h>
  55 #endif
  56
  57 #include <arpa/inet.h>
  58
  59 #include <stdio.h>
  60 #include <syslog.h>
  61 #include <errno.h>
  62 #include <string.h>
  63 #include <stdlib.h>
  64 #if defined(__NetBSD__) || defined(__OpenBSD__)
  65 #include <search.h>
  66 #endif
  67 #include <unistd.h>
  68 #include <ifaddrs.h>
  69
  70 #include "rtadvd.h"
  71 #include "advcap.h"
  72 #include "timer.h"
  73 #include "if.h"
  74 #include "config.h"
  75
  76 static time_t prefix_timo = (60 * 120); /* 2 hours.
  77                                          * XXX: should be configurable. */
  78 extern struct rainfo *ralist;
  79
  80 static struct rtadvd_timer *prefix_timeout(void *);
  81 static void makeentry(char *, size_t, int, char *, int);
  82 static void get_prefix(struct rainfo *);
  83 static int getinet6sysctl(int);
  84
  85 void
  86 getconfig(intface)
  87         char *intface;
  88 {
  89         int stat, pfxs, i;
  90         char tbuf[BUFSIZ];
  91         struct rainfo *tmp;
  92         long val;
  93         long long val64;
  94         char buf[BUFSIZ];
  95         char *bp = buf;
  96         char *addr;
  97         static int forwarding = -1;
  98
  99 #define MUSTHAVE(var, cap)      \
 100     do {                                                                \
 101         int t;                                                          \
 102         if ((t = agetnum(cap)) < 0) {                                   \
 103                 fprintf(stderr, "rtadvd: need %s for interface %s\n",   \
 104                         cap, intface);                                  \
 105                 exit(1);                                                \
 106         }                                                               \
 107         var = t;                                                        \
 108      } while (0)
 109 #define MAYHAVE(var, cap, def)  \
 110      do {                                                               \
 111         if ((var = agetnum(cap)) < 0)                                   \
 112                 var = def;                                              \
 113      } while (0)
 114
 115         if ((stat = agetent(tbuf, intface)) <= 0) {
 116                 memset(tbuf, 0, sizeof(tbuf));
 117                 syslog(LOG_INFO,
 118                        "<%s> %s isn't defined in the configuration file"
 119                        " or the configuration file doesn't exist."
 120                        " Treat it as default",
 121                         __FUNCTION__, intface);
 122         }
 123
 124         tmp = (struct rainfo *)malloc(sizeof(*ralist));
 125         memset(tmp, 0, sizeof(*tmp));
 126         tmp->prefix.next = tmp->prefix.prev = &tmp->prefix;
 127         tmp->route.next = tmp->route.prev = &tmp->route;
 128
 129         /* check if we are allowed to forward packets (if not determined) */
 130         if (forwarding < 0) {
 131                 if ((forwarding = getinet6sysctl(IPV6CTL_FORWARDING)) < 0)
 132                         exit(1);
 133         }
 134
 135         /* get interface information */
 136         if (agetflag("nolladdr"))
 137                 tmp->advlinkopt = 0;
 138         else
 139                 tmp->advlinkopt = 1;
 140         if (tmp->advlinkopt) {
 141                 if ((tmp->sdl = if_nametosdl(intface)) == NULL) {
 142                         syslog(LOG_ERR,
 143                                "<%s> can't get information of %s",
 144                                __FUNCTION__, intface);
 145                         exit(1);
 146                 }
 147                 tmp->ifindex = tmp->sdl->sdl_index;
 148         } else
 149                 tmp->ifindex = if_nametoindex(intface);
 150         strncpy(tmp->ifname, intface, sizeof(tmp->ifname));
 151         if ((tmp->phymtu = if_getmtu(intface)) == 0) {
 152                 tmp->phymtu = IPV6_MMTU;
 153                 syslog(LOG_WARNING,
 154                        "<%s> can't get interface mtu of %s. Treat as %d",
 155                        __FUNCTION__, intface, IPV6_MMTU);
 156         }
 157
 158         /*
 159          * set router configuration variables.
 160          */
 161         MAYHAVE(val, "maxinterval", DEF_MAXRTRADVINTERVAL);
 162         if (val < MIN_MAXINTERVAL || val > MAX_MAXINTERVAL) {
 163                 syslog(LOG_ERR,
 164                        "<%s> maxinterval must be between %e and %u",
 165                        __FUNCTION__, MIN_MAXINTERVAL, MAX_MAXINTERVAL);
 166                 exit(1);
 167         }
 168         tmp->maxinterval = (u_int)val;
 169         MAYHAVE(val, "mininterval", tmp->maxinterval/3);
 170         if (val < MIN_MININTERVAL || val > (tmp->maxinterval * 3) / 4) {
 171                 syslog(LOG_ERR,
 172                        "<%s> mininterval must be between %e and %d",
 173                        __FUNCTION__,
 174                        MIN_MININTERVAL,
 175                        (tmp->maxinterval * 3) / 4);
 176                 exit(1);
 177         }
 178         tmp->mininterval = (u_int)val;
 179
 180         MAYHAVE(val, "chlim", DEF_ADVCURHOPLIMIT);
 181         tmp->hoplimit = val & 0xff;
 182
 183         MAYHAVE(val, "raflags", 0);
 184         tmp->managedflg = val & ND_RA_FLAG_MANAGED;
 185         tmp->otherflg = val & ND_RA_FLAG_OTHER;
 186 #ifdef MIP6
 187         if (mobileip6)
 188                 tmp->haflg = val & ND_RA_FLAG_HA;
 189 #endif
 190 #ifndef ND_RA_FLAG_RTPREF_MASK
 191 #define ND_RA_FLAG_RTPREF_MASK  0x18 /* 00011000 */
 192 #define ND_RA_FLAG_RTPREF_RSV   0x10 /* 00010000 */
 193 #endif
 194         tmp->rtpref = val & ND_RA_FLAG_RTPREF_MASK;
 195         if (tmp->rtpref == ND_RA_FLAG_RTPREF_RSV) {
 196                 syslog(LOG_ERR, "<%s> invalid router preference on %s",
 197                        __FUNCTION__, intface);
 198                 exit(1);
 199         }
 200
 201         MAYHAVE(val, "rltime", tmp->maxinterval * 3);
 202         if (val && (val < tmp->maxinterval || val > MAXROUTERLIFETIME)) {
 203                 syslog(LOG_ERR,
 204                        "<%s> router lifetime on %s must be 0 or"
 205                        " between %d and %d",
 206                        __FUNCTION__, intface,
 207                        tmp->maxinterval, MAXROUTERLIFETIME);
 208                 exit(1);
 209         }
 210         /*
 211          * Basically, hosts MUST NOT send Router Advertisement messages at any
 212          * time (RFC 2461, Section 6.2.3). However, it would sometimes be
 213          * useful to allow hosts to advertise some parameters such as prefix
 214          * information and link MTU. Thus, we allow hosts to invoke rtadvd
 215          * only when router lifetime (on every advertising interface) is
 216          * explicitly set zero. (see also the above section)
 217          */
 218         if (val && forwarding == 0) {
 219                 syslog(LOG_WARNING,
 220                        "<%s> non zero router lifetime is specified for %s, "
 221                        "which must not be allowed for hosts.",
 222                        __FUNCTION__, intface);
 223                 exit(1);
 224         }
 225         tmp->lifetime = val & 0xffff;
 226
 227         MAYHAVE(val, "rtime", DEF_ADVREACHABLETIME);
 228         if (val > MAXREACHABLETIME) {
 229                 syslog(LOG_ERR,
 230                        "<%s> reachable time must be no greater than %d",
 231                        __FUNCTION__, MAXREACHABLETIME);
 232                 exit(1);
 233         }
 234         tmp->reachabletime = (u_int32_t)val;
 235
 236         MAYHAVE(val64, "retrans", DEF_ADVRETRANSTIMER);
 237         if (val64 < 0 || val64 > 0xffffffff) {
 238                 syslog(LOG_ERR,
 239                        "<%s> retrans time out of range", __FUNCTION__);
 240                 exit(1);
 241         }
 242         tmp->retranstimer = (u_int32_t)val64;
 243
 244 #ifndef MIP6
 245         if (agetstr("hapref", &bp) || agetstr("hatime", &bp)) {
 246                 syslog(LOG_ERR,
 247                        "<%s> mobile-ip6 configuration not supported",
 248                        __FUNCTION__);
 249                 exit(1);
 250         }
 251 #else
 252         if (!mobileip6) {
 253                 if (agetstr("hapref", &bp) || agetstr("hatime", &bp)) {
 254                         syslog(LOG_ERR,
 255                                "<%s> mobile-ip6 configuration without "
 256                                "proper command line option",
 257                                __FUNCTION__);
 258                         exit(1);
 259                 }
 260         } else {
 261                 tmp->hapref = 0;
 262                 if ((val = agetnum("hapref")) >= 0)
 263                         tmp->hapref = (int16_t)val;
 264                 if (tmp->hapref != 0) {
 265                         tmp->hatime = 0;
 266                         MUSTHAVE(val, "hatime");
 267                         tmp->hatime = (u_int16_t)val;
 268                         if (tmp->hatime <= 0) {
 269                                 syslog(LOG_ERR,
 270                                        "<%s> home agent lifetime must be greater than 0",
 271                                        __FUNCTION__);
 272                                 exit(1);
 273                         }
 274                 }
 275         }
 276 #endif
 277
 278         /* prefix information */
 279
 280         /*
 281          * This is an implementation specific parameter to consinder
 282          * link propagation delays and poorly synchronized clocks when
 283          * checking consistency of advertised lifetimes.
 284          */
 285         MAYHAVE(val, "clockskew", 0);
 286         tmp->clockskew = val;
 287
 288         if ((pfxs = agetnum("addrs")) < 0) {
 289                 /* auto configure prefix information */
 290                 if (agetstr("addr", &bp) || agetstr("addr1", &bp)) {
 291                         syslog(LOG_ERR,
 292                                "<%s> conflicting prefix configuration for %s: "
 293                                "automatic and manual config at the same time",
 294                                __FUNCTION__, intface);
 295                         exit(1);
 296                 }
 297                 get_prefix(tmp);
 298         }
 299         else {
 300                 tmp->pfxs = pfxs;
 301                 for (i = 0; i < pfxs; i++) {
 302                         struct prefix *pfx;
 303                         char entbuf[256];
 304                         int added = (pfxs > 1) ? 1 : 0;
 305
 306                         /* allocate memory to store prefix information */
 307                         if ((pfx = malloc(sizeof(struct prefix))) == NULL) {
 308                                 syslog(LOG_ERR,
 309                                        "<%s> can't allocate enough memory",
 310                                        __FUNCTION__);
 311                                 exit(1);
 312                         }
 313                         memset(pfx, 0, sizeof(*pfx));
 314
 315                         /* link into chain */
 316                         insque(pfx, &tmp->prefix);
 317                         pfx->rainfo = tmp;
 318
 319                         pfx->origin = PREFIX_FROM_CONFIG;
 320
 321                         makeentry(entbuf, sizeof(entbuf), i, "prefixlen",
 322                             added);
 323                         MAYHAVE(val, entbuf, 64);
 324                         if (val < 0 || val > 128) {
 325                                 syslog(LOG_ERR,
 326                                        "<%s> prefixlen out of range",
 327                                        __FUNCTION__);
 328                                 exit(1);
 329                         }
 330                         pfx->prefixlen = (int)val;
 331
 332                         makeentry(entbuf, sizeof(entbuf), i, "pinfoflags",
 333                             added);
 334 #ifdef MIP6
 335                         if (mobileip6)
 336                         {
 337                                 MAYHAVE(val, entbuf,
 338                                     (ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO|
 339                                          ND_OPT_PI_FLAG_ROUTER));
 340                         } else
 341 #endif
 342                         {
 343                                 MAYHAVE(val, entbuf,
 344                                     (ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO));
 345                         }
 346                         pfx->onlinkflg = val & ND_OPT_PI_FLAG_ONLINK;
 347                         pfx->autoconfflg = val & ND_OPT_PI_FLAG_AUTO;
 348 #ifdef MIP6
 349                         pfx->routeraddr = val & ND_OPT_PI_FLAG_ROUTER;
 350 #endif
 351
 352                         makeentry(entbuf, sizeof(entbuf), i, "vltime", added);
 353                         MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME);
 354                         if (val64 < 0 || val64 > 0xffffffff) {
 355                                 syslog(LOG_ERR,
 356                                        "<%s> vltime out of range",
 357                                        __FUNCTION__);
 358                                 exit(1);
 359                         }
 360                         pfx->validlifetime = (u_int32_t)val64;
 361
 362                         makeentry(entbuf, sizeof(entbuf), i, "vltimedecr",
 363                             added);
 364                         if (agetflag(entbuf)) {
 365                                 struct timeval now;
 366                                 gettimeofday(&now, 0);
 367                                 pfx->vltimeexpire =
 368                                         now.tv_sec + pfx->validlifetime;
 369                         }
 370
 371                         makeentry(entbuf, sizeof(entbuf), i, "pltime", added);
 372                         MAYHAVE(val64, entbuf, DEF_ADVPREFERREDLIFETIME);
 373                         if (val64 < 0 || val64 > 0xffffffff) {
 374                                 syslog(LOG_ERR,
 375                                        "<%s> pltime out of range",
 376                                        __FUNCTION__);
 377                                 exit(1);
 378                         }
 379                         pfx->preflifetime = (u_int32_t)val64;
 380
 381                         makeentry(entbuf, sizeof(entbuf), i, "pltimedecr",
 382                             added);
 383                         if (agetflag(entbuf)) {
 384                                 struct timeval now;
 385                                 gettimeofday(&now, 0);
 386                                 pfx->pltimeexpire =
 387                                         now.tv_sec + pfx->preflifetime;
 388                         }
 389
 390                         makeentry(entbuf, sizeof(entbuf), i, "addr", added);
 391                         addr = (char *)agetstr(entbuf, &bp);
 392                         if (addr == NULL) {
 393                                 syslog(LOG_ERR,
 394                                        "<%s> need %s as an prefix for "
 395                                        "interface %s",
 396                                        __FUNCTION__, entbuf, intface);
 397                                 exit(1);
 398                         }
 399                         if (inet_pton(AF_INET6, addr,
 400                                       &pfx->prefix) != 1) {
 401                                 syslog(LOG_ERR,
 402                                        "<%s> inet_pton failed for %s",
 403                                        __FUNCTION__, addr);
 404                                 exit(1);
 405                         }
 406                         if (IN6_IS_ADDR_MULTICAST(&pfx->prefix)) {
 407                                 syslog(LOG_ERR,
 408                                        "<%s> multicast prefix(%s) must "
 409                                        "not be advertised (IF=%s)",
 410                                        __FUNCTION__, addr, intface);
 411                                 exit(1);
 412                         }
 413                         if (IN6_IS_ADDR_LINKLOCAL(&pfx->prefix))
 414                                 syslog(LOG_NOTICE,
 415                                        "<%s> link-local prefix(%s) will be"
 416                                        " advertised on %s",
 417                                        __FUNCTION__, addr, intface);
 418                 }
 419         }
 420
 421         MAYHAVE(val, "mtu", 0);
 422         if (val < 0 || val > 0xffffffff) {
 423                 syslog(LOG_ERR,
 424                        "<%s> mtu out of range", __FUNCTION__);
 425                 exit(1);
 426         }
 427         tmp->linkmtu = (u_int32_t)val;
 428         if (tmp->linkmtu == 0) {
 429                 char *mtustr;
 430
 431                 if ((mtustr = (char *)agetstr("mtu", &bp)) &&
 432                     strcmp(mtustr, "auto") == 0)
 433                         tmp->linkmtu = tmp->phymtu;
 434         }
 435         else if (tmp->linkmtu < IPV6_MMTU || tmp->linkmtu > tmp->phymtu) {
 436                 syslog(LOG_ERR,
 437                        "<%s> advertised link mtu must be between"
 438                        " least MTU and physical link MTU",
 439                        __FUNCTION__);
 440                 exit(1);
 441         }
 442
 443         /* route information */
 444
 445         MAYHAVE(val, "routes", 0);
 446         if (val < 0 || val > 0xffffffff) {
 447                 syslog(LOG_ERR,
 448                        "<%s> number of route information improper", __FUNCTION__);
 449                 exit(1);
 450         }
 451         tmp->routes = val;
 452         for (i = 0; i < tmp->routes; i++) {
 453                 struct rtinfo *rti;
 454                 char entbuf[256];
 455                 int added = (tmp->routes > 1) ? 1 : 0;
 456
 457                 /* allocate memory to store prefix information */
 458                 if ((rti = malloc(sizeof(struct rtinfo))) == NULL) {
 459                         syslog(LOG_ERR,
 460                                "<%s> can't allocate enough memory",
 461                                __FUNCTION__);
 462                         exit(1);
 463                 }
 464                 memset(rti, 0, sizeof(*rti));
 465
 466                 /* link into chain */
 467                 insque(rti, &tmp->route);
 468
 469                 makeentry(entbuf, sizeof(entbuf), i, "rtrplen", added);
 470                 MAYHAVE(val, entbuf, 64);
 471                 if (val < 0 || val > 128) {
 472                         syslog(LOG_ERR,
 473                                "<%s> prefixlen out of range",
 474                                __FUNCTION__);
 475                         exit(1);
 476                 }
 477                 rti->prefixlen = (int)val;
 478
 479                 makeentry(entbuf, sizeof(entbuf), i, "rtrflags", added);
 480                 MAYHAVE(val, entbuf, 0);
 481                 rti->rtpref = val & ND_RA_FLAG_RTPREF_MASK;
 482                 if (rti->rtpref == ND_RA_FLAG_RTPREF_RSV) {
 483                         syslog(LOG_ERR, "<%s> invalid route preference",
 484                                __FUNCTION__);
 485                         exit(1);
 486                 }
 487
 488                 makeentry(entbuf, sizeof(entbuf), i, "rtrltime", added);
 489                 /*
 490                  * XXX: since default value of route lifetime is not defined in
 491                  * draft-draves-route-selection-01.txt, I took the default
 492                  * value of valid lifetime of prefix as its default.
 493                  * It need be much considered.
 494                  */
 495                 MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME);
 496                 if (val64 < 0 || val64 > 0xffffffff) {
 497                         syslog(LOG_ERR,
 498                                "<%s> rtrltime out of range",
 499                                __FUNCTION__);
 500                         exit(1);
 501                 }
 502                 rti->ltime = (u_int32_t)val64;
 503
 504                 makeentry(entbuf, sizeof(entbuf), i, "rtrprefix", added);
 505                 addr = (char *)agetstr(entbuf, &bp);
 506                 if (addr == NULL) {
 507                         syslog(LOG_ERR,
 508                                "<%s> need %s as an route for "
 509                                "interface %s",
 510                                __FUNCTION__, entbuf, intface);
 511                         exit(1);
 512                 }
 513                 if (inet_pton(AF_INET6, addr, &rti->prefix) != 1) {
 514                         syslog(LOG_ERR,
 515                                "<%s> inet_pton failed for %s",
 516                                __FUNCTION__, addr);
 517                         exit(1);
 518                 }
 519 #if 0
 520                 /*
 521                  * XXX: currently there's no restriction in route information
 522                  * prefix according to draft-draves-route-selection-01.txt,
 523                  * however I think the similar restriction be necessary.
 524                  */
 525                 MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME);
 526                 if (IN6_IS_ADDR_MULTICAST(&rti->prefix)) {
 527                         syslog(LOG_ERR,
 528                                "<%s> multicast route (%s) must "
 529                                "not be advertised (IF=%s)",
 530                                __FUNCTION__, addr, intface);
 531                         exit(1);
 532                 }
 533                 if (IN6_IS_ADDR_LINKLOCAL(&rti->prefix)) {
 534                         syslog(LOG_NOTICE,
 535                                "<%s> link-local route (%s) must "
 536                                "not be advertised on %s",
 537                                __FUNCTION__, addr, intface);
 538                         exit(1);
 539                 }
 540 #endif
 541         }
 542
 543         /* okey */
 544         tmp->next = ralist;
 545         ralist = tmp;
 546
 547         /* construct the sending packet */
 548         make_packet(tmp);
 549
 550         /* set timer */
 551         tmp->timer = rtadvd_add_timer(ra_timeout, ra_timer_update,
 552                                       tmp, tmp);
 553         ra_timer_update((void *)tmp, &tmp->timer->tm);
 554         rtadvd_set_timer(&tmp->timer->tm, tmp->timer);
 555 }
 556
 557 static void
 558 get_prefix(struct rainfo *rai)
 559 {
 560         struct ifaddrs *ifap, *ifa;
 561         struct prefix *pp;
 562         struct in6_addr *a;
 563         u_char *p, *ep, *m, *lim;
 564         u_char ntopbuf[INET6_ADDRSTRLEN];
 565
 566         if (getifaddrs(&ifap) < 0) {
 567                 syslog(LOG_ERR,
 568                        "<%s> can't get interface addresses",
 569                        __FUNCTION__);
 570                 exit(1);
 571         }
 572         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 573                 int plen;
 574
 575                 if (strcmp(ifa->ifa_name, rai->ifname) != 0)
 576                         continue;
 577                 if (ifa->ifa_addr->sa_family != AF_INET6)
 578                         continue;
 579                 a = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
 580                 if (IN6_IS_ADDR_LINKLOCAL(a))
 581                         continue;
 582
 583                 /* get prefix length */
 584                 m = (u_char *)&((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
 585                 lim = (u_char *)(ifa->ifa_netmask) + ifa->ifa_netmask->sa_len;
 586                 plen = prefixlen(m, lim);
 587                 if (plen < 0 || plen > 128) {
 588                         syslog(LOG_ERR, "<%s> failed to get prefixlen "
 589                                "or prefix is invalid",
 590                                __FUNCTION__);
 591                         exit(1);
 592                 }
 593                 if (find_prefix(rai, a, plen)) {
 594                         /* ignore a duplicated prefix. */
 595                         continue;
 596                 }
 597
 598                 /* allocate memory to store prefix info. */
 599                 if ((pp = malloc(sizeof(*pp))) == NULL) {
 600                         syslog(LOG_ERR,
 601                                "<%s> can't get allocate buffer for prefix",
 602                                __FUNCTION__);
 603                         exit(1);
 604                 }
 605                 memset(pp, 0, sizeof(*pp));
 606
 607                 /* set prefix, sweep bits outside of prefixlen */
 608                 pp->prefixlen = plen;
 609                 memcpy(&pp->prefix, a, sizeof(*a));
 610                 p = (u_char *)&pp->prefix;
 611                 ep = (u_char *)(&pp->prefix + 1);
 612                 while (m < lim)
 613                         *p++ &= *m++;
 614                 while (p < ep)
 615                         *p++ = 0x00;
 616
 617                 if (!inet_ntop(AF_INET6, &pp->prefix, ntopbuf,
 618                     sizeof(ntopbuf))) {
 619                         syslog(LOG_ERR, "<%s> inet_ntop failed", __FUNCTION__);
 620                         exit(1);
 621                 }
 622                 syslog(LOG_DEBUG,
 623                        "<%s> add %s/%d to prefix list on %s",
 624                        __FUNCTION__, ntopbuf, pp->prefixlen, rai->ifname);
 625
 626                 /* set other fields with protocol defaults */
 627                 pp->validlifetime = DEF_ADVVALIDLIFETIME;
 628                 pp->preflifetime = DEF_ADVPREFERREDLIFETIME;
 629                 pp->onlinkflg = 1;
 630                 pp->autoconfflg = 1;
 631                 pp->origin = PREFIX_FROM_KERNEL;
 632
 633                 /* link into chain */
 634                 insque(pp, &rai->prefix);
 635
 636                 /* counter increment */
 637                 rai->pfxs++;
 638         }
 639
 640         freeifaddrs(ifap);
 641 }
 642
 643 static void
 644 makeentry(buf, len, id, string, add)
 645         char *buf;
 646         size_t len;
 647         int id;
 648         char *string;
 649         int add;
 650 {
 651         char *ep = buf + len;
 652
 653         strcpy(buf, string);
 654         if (add) {
 655                 char *cp;
 656
 657                 cp = (char *)index(buf, '\0');
 658                 snprintf(cp, ep - cp, "%d", id);
 659         }
 660 }
 661
 662 /*
 663  * Add a prefix to the list of specified interface and reconstruct
 664  * the outgoing packet.
 665  * The prefix must not be in the list.
 666  * XXX: other parameter of the prefix(e.g. lifetime) shoule be
 667  * able to be specified.
 668  */
 669 static void
 670 add_prefix(struct rainfo *rai, struct in6_prefixreq *ipr)
 671 {
 672         struct prefix *prefix;
 673         u_char ntopbuf[INET6_ADDRSTRLEN];
 674
 675         if ((prefix = malloc(sizeof(*prefix))) == NULL) {
 676                 syslog(LOG_ERR, "<%s> memory allocation failed",
 677                        __FUNCTION__);
 678                 return;         /* XXX: error or exit? */
 679         }
 680         memset(prefix, 0, sizeof(*prefix));
 681         prefix->prefix = ipr->ipr_prefix.sin6_addr;
 682         prefix->prefixlen = ipr->ipr_plen;
 683         prefix->validlifetime = ipr->ipr_vltime;
 684         prefix->preflifetime = ipr->ipr_pltime;
 685         prefix->onlinkflg = ipr->ipr_raf_onlink;
 686         prefix->autoconfflg = ipr->ipr_raf_auto;
 687         prefix->origin = PREFIX_FROM_DYNAMIC;
 688
 689         insque(prefix, &rai->prefix);
 690         prefix->rainfo = rai;
 691
 692         syslog(LOG_DEBUG, "<%s> new prefix %s/%d was added on %s",
 693                __FUNCTION__, inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr,
 694                                        ntopbuf, INET6_ADDRSTRLEN),
 695                ipr->ipr_plen, rai->ifname);
 696
 697         /* free the previous packet */
 698         free(rai->ra_data);
 699         rai->ra_data = NULL;
 700
 701         /* reconstruct the packet */
 702         rai->pfxs++;
 703         make_packet(rai);
 704
 705         /*
 706          * reset the timer so that the new prefix will be advertised quickly.
 707          */
 708         rai->initcounter = 0;
 709         ra_timer_update((void *)rai, &rai->timer->tm);
 710         rtadvd_set_timer(&rai->timer->tm, rai->timer);
 711 }
 712
 713 /*
 714  * Delete a prefix to the list of specified interface and reconstruct
 715  * the outgoing packet.
 716  * The prefix must be in the list.
 717  */
 718 void
 719 delete_prefix(struct prefix *prefix)
 720 {
 721         u_char ntopbuf[INET6_ADDRSTRLEN];
 722         struct rainfo *rai = prefix->rainfo;
 723
 724         remque(prefix);
 725         syslog(LOG_DEBUG, "<%s> prefix %s/%d was deleted on %s",
 726                __FUNCTION__, inet_ntop(AF_INET6, &prefix->prefix,
 727                                        ntopbuf, INET6_ADDRSTRLEN),
 728                prefix->prefixlen, rai->ifname);
 729         if (prefix->timer)
 730                 rtadvd_remove_timer(&prefix->timer);
 731         free(prefix);
 732         rai->pfxs--;
 733 }
 734
 735 void
 736 invalidate_prefix(struct prefix *prefix)
 737 {
 738         u_char ntopbuf[INET6_ADDRSTRLEN];
 739         struct timeval timo;
 740         struct rainfo *rai = prefix->rainfo;
 741
 742         if (prefix->timer) {    /* sanity check */
 743                 syslog(LOG_ERR,
 744                     "<%s> assumption failure: timer already exists",
 745                     __FUNCTION__);
 746                 exit(1);
 747         }
 748
 749         syslog(LOG_DEBUG, "<%s> prefix %s/%d was invalidated on %s, "
 750             "will expire in %ld seconds", __FUNCTION__,
 751             inet_ntop(AF_INET6, &prefix->prefix, ntopbuf, INET6_ADDRSTRLEN),
 752             prefix->prefixlen, rai->ifname, (long)prefix_timo);
 753
 754         /* set the expiration timer */
 755         prefix->timer = rtadvd_add_timer(prefix_timeout, NULL, prefix, NULL);
 756         if (prefix->timer == NULL) {
 757                 syslog(LOG_ERR, "<%s> failed to add a timer for a prefix. "
 758                     "remove the prefix", __FUNCTION__);
 759                 delete_prefix(prefix);
 760         }
 761         timo.tv_sec = prefix_timo;
 762         timo.tv_usec = 0;
 763         rtadvd_set_timer(&timo, prefix->timer);
 764 }
 765
 766 static struct rtadvd_timer *
 767 prefix_timeout(void *arg)
 768 {
 769         struct prefix *prefix = (struct prefix *)arg;
 770
 771         delete_prefix(prefix);
 772
 773         return(NULL);
 774 }
 775
 776 void
 777 update_prefix(struct prefix * prefix)
 778 {
 779         u_char ntopbuf[INET6_ADDRSTRLEN];
 780         struct rainfo *rai = prefix->rainfo;
 781
 782         if (prefix->timer == NULL) { /* sanity check */
 783                 syslog(LOG_ERR,
 784                     "<%s> assumption failure: timer does not exist",
 785                     __FUNCTION__);
 786                 exit(1);
 787         }
 788
 789         syslog(LOG_DEBUG, "<%s> prefix %s/%d was re-enabled on %s",
 790             __FUNCTION__, inet_ntop(AF_INET6, &prefix->prefix, ntopbuf,
 791             INET6_ADDRSTRLEN), prefix->prefixlen, rai->ifname);
 792
 793         /* stop the expiration timer */
 794         rtadvd_remove_timer(&prefix->timer);
 795 }
 796
 797 /*
 798  * Try to get an in6_prefixreq contents for a prefix which matches
 799  * ipr->ipr_prefix and ipr->ipr_plen and belongs to
 800  * the interface whose name is ipr->ipr_name[].
 801  */
 802 static int
 803 init_prefix(struct in6_prefixreq *ipr)
 804 {
 805 #if 0
 806         int s;
 807
 808         if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 809                 syslog(LOG_ERR, "<%s> socket: %s", __FUNCTION__,
 810                        strerror(errno));
 811                 exit(1);
 812         }
 813
 814         if (ioctl(s, SIOCGIFPREFIX_IN6, (caddr_t)ipr) < 0) {
 815                 syslog(LOG_INFO, "<%s> ioctl:SIOCGIFPREFIX %s", __FUNCTION__,
 816                        strerror(errno));
 817
 818                 ipr->ipr_vltime = DEF_ADVVALIDLIFETIME;
 819                 ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME;
 820                 ipr->ipr_raf_onlink = 1;
 821                 ipr->ipr_raf_auto = 1;
 822                 /* omit other field initialization */
 823         }
 824         else if (ipr->ipr_origin < PR_ORIG_RR) {
 825                 u_char ntopbuf[INET6_ADDRSTRLEN];
 826
 827                 syslog(LOG_WARNING, "<%s> Added prefix(%s)'s origin %d is"
 828                        "lower than PR_ORIG_RR(router renumbering)."
 829                        "This should not happen if I am router", __FUNCTION__,
 830                        inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, ntopbuf,
 831                                  sizeof(ntopbuf)), ipr->ipr_origin);
 832                 close(s);
 833                 return 1;
 834         }
 835
 836         close(s);
 837         return 0;
 838 #else
 839         ipr->ipr_vltime = DEF_ADVVALIDLIFETIME;
 840         ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME;
 841         ipr->ipr_raf_onlink = 1;
 842         ipr->ipr_raf_auto = 1;
 843         return 0;
 844 #endif
 845 }
 846
 847 void
 848 make_prefix(struct rainfo *rai, int ifindex, struct in6_addr *addr, int plen)
 849 {
 850         struct in6_prefixreq ipr;
 851
 852         memset(&ipr, 0, sizeof(ipr));
 853         if (if_indextoname(ifindex, ipr.ipr_name) == NULL) {
 854                 syslog(LOG_ERR, "<%s> Prefix added interface No.%d doesn't"
 855                        "exist. This should not happen! %s", __FUNCTION__,
 856                        ifindex, strerror(errno));
 857                 exit(1);
 858         }
 859         ipr.ipr_prefix.sin6_len = sizeof(ipr.ipr_prefix);
 860         ipr.ipr_prefix.sin6_family = AF_INET6;
 861         ipr.ipr_prefix.sin6_addr = *addr;
 862         ipr.ipr_plen = plen;
 863
 864         if (init_prefix(&ipr))
 865                 return; /* init failed by some error */
 866         add_prefix(rai, &ipr);
 867 }
 868
 869 void
 870 make_packet(struct rainfo *rainfo)
 871 {
 872         size_t packlen, lladdroptlen = 0;
 873         char *buf;
 874         struct nd_router_advert *ra;
 875         struct nd_opt_prefix_info *ndopt_pi;
 876         struct nd_opt_mtu *ndopt_mtu;
 877 #ifdef MIP6
 878         struct nd_opt_advinterval *ndopt_advint;
 879         struct nd_opt_homeagent_info *ndopt_hai;
 880 #endif
 881         struct nd_opt_route_info *ndopt_rti;
 882         struct prefix *pfx;
 883         struct rtinfo *rti;
 884
 885         /* calculate total length */
 886         packlen = sizeof(struct nd_router_advert);
 887         if (rainfo->advlinkopt) {
 888                 if ((lladdroptlen = lladdropt_length(rainfo->sdl)) == 0) {
 889                         syslog(LOG_INFO,
 890                                "<%s> link-layer address option has"
 891                                " null length on %s."
 892                                " Treat as not included.",
 893                                __FUNCTION__, rainfo->ifname);
 894                         rainfo->advlinkopt = 0;
 895                 }
 896                 packlen += lladdroptlen;
 897         }
 898         if (rainfo->pfxs)
 899                 packlen += sizeof(struct nd_opt_prefix_info) * rainfo->pfxs;
 900         if (rainfo->linkmtu)
 901                 packlen += sizeof(struct nd_opt_mtu);
 902 #ifdef MIP6
 903         if (mobileip6 && rainfo->maxinterval)
 904                 packlen += sizeof(struct nd_opt_advinterval);
 905         if (mobileip6 && rainfo->hatime)
 906                 packlen += sizeof(struct nd_opt_homeagent_info);
 907 #endif
 908 #ifdef ND_OPT_ROUTE_INFO
 909         for (rti = rainfo->route.next; rti != &rainfo->route; rti = rti->next)
 910                 packlen += sizeof(struct nd_opt_route_info) +
 911                            ((rti->prefixlen + 0x3f) >> 6) * 8;
 912 #endif
 913
 914         /* allocate memory for the packet */
 915         if ((buf = malloc(packlen)) == NULL) {
 916                 syslog(LOG_ERR,
 917                        "<%s> can't get enough memory for an RA packet",
 918                        __FUNCTION__);
 919                 exit(1);
 920         }
 921         if (rainfo->ra_data) {
 922                 /* free the previous packet */
 923                 free(rainfo->ra_data);
 924                 rainfo->ra_data = NULL;
 925         }
 926         rainfo->ra_data = buf;
 927         /* XXX: what if packlen > 576? */
 928         rainfo->ra_datalen = packlen;
 929
 930         /*
 931          * construct the packet
 932          */
 933         ra = (struct nd_router_advert *)buf;
 934         ra->nd_ra_type = ND_ROUTER_ADVERT;
 935         ra->nd_ra_code = 0;
 936         ra->nd_ra_cksum = 0;
 937         ra->nd_ra_curhoplimit = (u_int8_t)(0xff & rainfo->hoplimit);
 938         ra->nd_ra_flags_reserved = 0; /* just in case */
 939         /*
 940          * XXX: the router preference field, which is a 2-bit field, should be
 941          * initialized before other fields.
 942          */
 943         ra->nd_ra_flags_reserved = 0xff & rainfo->rtpref;
 944         ra->nd_ra_flags_reserved |=
 945                 rainfo->managedflg ? ND_RA_FLAG_MANAGED : 0;
 946         ra->nd_ra_flags_reserved |=
 947                 rainfo->otherflg ? ND_RA_FLAG_OTHER : 0;
 948 #ifdef MIP6
 949         ra->nd_ra_flags_reserved |=
 950                 rainfo->haflg ? ND_RA_FLAG_HA : 0;
 951 #endif
 952         ra->nd_ra_router_lifetime = htons(rainfo->lifetime);
 953         ra->nd_ra_reachable = htonl(rainfo->reachabletime);
 954         ra->nd_ra_retransmit = htonl(rainfo->retranstimer);
 955         buf += sizeof(*ra);
 956
 957         if (rainfo->advlinkopt) {
 958                 lladdropt_fill(rainfo->sdl, (struct nd_opt_hdr *)buf);
 959                 buf += lladdroptlen;
 960         }
 961
 962         if (rainfo->linkmtu) {
 963                 ndopt_mtu = (struct nd_opt_mtu *)buf;
 964                 ndopt_mtu->nd_opt_mtu_type = ND_OPT_MTU;
 965                 ndopt_mtu->nd_opt_mtu_len = 1;
 966                 ndopt_mtu->nd_opt_mtu_reserved = 0;
 967                 ndopt_mtu->nd_opt_mtu_mtu = htonl(rainfo->linkmtu);
 968                 buf += sizeof(struct nd_opt_mtu);
 969         }
 970
 971 #ifdef MIP6
 972         if (mobileip6 && rainfo->maxinterval) {
 973                 ndopt_advint = (struct nd_opt_advinterval *)buf;
 974                 ndopt_advint->nd_opt_adv_type = ND_OPT_ADVINTERVAL;
 975                 ndopt_advint->nd_opt_adv_len = 1;
 976                 ndopt_advint->nd_opt_adv_reserved = 0;
 977                 ndopt_advint->nd_opt_adv_interval = htonl(rainfo->maxinterval *
 978                                                           1000);
 979                 buf += sizeof(struct nd_opt_advinterval);
 980         }
 981 #endif
 982
 983 #ifdef MIP6
 984         if (rainfo->hatime) {
 985                 ndopt_hai = (struct nd_opt_homeagent_info *)buf;
 986                 ndopt_hai->nd_opt_hai_type = ND_OPT_HOMEAGENT_INFO;
 987                 ndopt_hai->nd_opt_hai_len = 1;
 988                 ndopt_hai->nd_opt_hai_reserved = 0;
 989                 ndopt_hai->nd_opt_hai_preference = htons(rainfo->hapref);
 990                 ndopt_hai->nd_opt_hai_lifetime = htons(rainfo->hatime);
 991                 buf += sizeof(struct nd_opt_homeagent_info);
 992         }
 993 #endif
 994
 995         for (pfx = rainfo->prefix.next;
 996              pfx != &rainfo->prefix; pfx = pfx->next) {
 997                 u_int32_t vltime, pltime;
 998                 struct timeval now;
 999
1000                 ndopt_pi = (struct nd_opt_prefix_info *)buf;
1001                 ndopt_pi->nd_opt_pi_type = ND_OPT_PREFIX_INFORMATION;
1002                 ndopt_pi->nd_opt_pi_len = 4;
1003                 ndopt_pi->nd_opt_pi_prefix_len = pfx->prefixlen;
1004                 ndopt_pi->nd_opt_pi_flags_reserved = 0;
1005                 if (pfx->onlinkflg)
1006                         ndopt_pi->nd_opt_pi_flags_reserved |=
1007                                 ND_OPT_PI_FLAG_ONLINK;
1008                 if (pfx->autoconfflg)
1009                         ndopt_pi->nd_opt_pi_flags_reserved |=
1010                                 ND_OPT_PI_FLAG_AUTO;
1011 #ifdef MIP6
1012                 if (pfx->routeraddr)
1013                         ndopt_pi->nd_opt_pi_flags_reserved |=
1014                                 ND_OPT_PI_FLAG_ROUTER;
1015 #endif
1016                 if (pfx->timer)
1017                         vltime = 0;
1018                 else {
1019                         if (pfx->vltimeexpire || pfx->pltimeexpire)
1020                                 gettimeofday(&now, NULL);
1021                         if (pfx->vltimeexpire == 0)
1022                                 vltime = pfx->validlifetime;
1023                         else
1024                                 vltime = (pfx->vltimeexpire > now.tv_sec) ?
1025                                     pfx->vltimeexpire - now.tv_sec : 0;
1026                 }
1027                 if (pfx->timer)
1028                         pltime = 0;
1029                 else {
1030                         if (pfx->pltimeexpire == 0)
1031                                 pltime = pfx->preflifetime;
1032                         else
1033                                 pltime = (pfx->pltimeexpire > now.tv_sec) ?
1034                                     pfx->pltimeexpire - now.tv_sec : 0;
1035                 }
1036                 if (vltime < pltime) {
1037                         /*
1038                          * this can happen if vltime is decrement but pltime
1039                          * is not.
1040                          */
1041                         pltime = vltime;
1042                 }
1043                 ndopt_pi->nd_opt_pi_valid_time = htonl(vltime);
1044                 ndopt_pi->nd_opt_pi_preferred_time = htonl(pltime);
1045                 ndopt_pi->nd_opt_pi_reserved2 = 0;
1046                 ndopt_pi->nd_opt_pi_prefix = pfx->prefix;
1047
1048                 buf += sizeof(struct nd_opt_prefix_info);
1049         }
1050
1051 #ifdef ND_OPT_ROUTE_INFO
1052         for (rti = rainfo->route.next; rti != &rainfo->route; rti = rti->next) {
1053                 u_int8_t psize = (rti->prefixlen + 0x3f) >> 6;
1054
1055                 ndopt_rti = (struct nd_opt_route_info *)buf;
1056                 ndopt_rti->nd_opt_rti_type = ND_OPT_ROUTE_INFO;
1057                 ndopt_rti->nd_opt_rti_len = 1 + psize;
1058                 ndopt_rti->nd_opt_rti_prefixlen = rti->prefixlen;
1059                 ndopt_rti->nd_opt_rti_flags = 0xff & rti->rtpref;
1060                 ndopt_rti->nd_opt_rti_lifetime = htonl(rti->ltime);
1061                 memcpy(ndopt_rti + 1, &rti->prefix, psize * 8);
1062                 buf += sizeof(struct nd_opt_route_info) + psize * 8;
1063         }
1064 #endif
1065
1066         return;
1067 }
1068
1069 static int
1070 getinet6sysctl(int code)
1071 {
1072         int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
1073         int value;
1074         size_t size;
1075
1076         mib[3] = code;
1077         size = sizeof(value);
1078         if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0)
1079             < 0) {
1080                 syslog(LOG_ERR, "<%s>: failed to get ip6 sysctl(%d): %s",
1081                        __FUNCTION__, code,
1082                        strerror(errno));
1083                 return(-1);
1084         }
1085         else
1086                 return(value);
1087 }