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