rtadvd.tproj/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 1.3.2.3 2001/07/03 11:02:14 ume 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(__FreeBSD__) && __FreeBSD__ >= 3
  42 #include <net/if_var.h>
  43 #endif /* __FreeBSD__ >= 3 */
  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 #if defined(__NetBSD__) || defined(__OpenBSD__)
  64 #include <search.h>
  65 #endif
  66 #include <unistd.h>
  67 #include <ifaddrs.h>
  68
  69 #include "rtadvd.h"
  70 #include "advcap.h"
  71 #include "timer.h"
  72 #include "if.h"
  73 #include "config.h"
  74
  75 static void makeentry __P((char *, int, char *, int));
  76 static void get_prefix __P((struct rainfo *));
  77 static int getinet6sysctl __P((int));
  78
  79 extern struct rainfo *ralist;
  80
  81 void
  82 getconfig(intface)
  83         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                         __FUNCTION__, 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                                __FUNCTION__, 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                        __FUNCTION__, 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                        __FUNCTION__, 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                        __FUNCTION__,
 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                        __FUNCTION__, 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                        __FUNCTION__, 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                        __FUNCTION__, 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                        __FUNCTION__, 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", __FUNCTION__);
 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                        __FUNCTION__);
 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                                __FUNCTION__);
 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                                        __FUNCTION__);
 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                                __FUNCTION__, 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                                        __FUNCTION__);
 307                                 exit(1);
 308                         }
 309                         memset(pfx, 0, sizeof(*pfx));
 310
 311                         /* link into chain */
 312                         insque(pfx, &tmp->prefix);
 313
 314                         pfx->origin = PREFIX_FROM_CONFIG;
 315
 316                         makeentry(entbuf, i, "prefixlen", added);
 317                         MAYHAVE(val, entbuf, 64);
 318                         if (val < 0 || val > 128) {
 319                                 syslog(LOG_ERR,
 320                                        "<%s> prefixlen out of range",
 321                                        __FUNCTION__);
 322                                 exit(1);
 323                         }
 324                         pfx->prefixlen = (int)val;
 325
 326                         makeentry(entbuf, i, "pinfoflags", added);
 327 #ifdef MIP6
 328                         if (mobileip6)
 329                         {
 330                                 MAYHAVE(val, entbuf,
 331                                     (ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO|
 332                                          ND_OPT_PI_FLAG_ROUTER));
 333                         } else
 334 #endif
 335                         {
 336                                 MAYHAVE(val, entbuf,
 337                                     (ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO));
 338                         }
 339                         pfx->onlinkflg = val & ND_OPT_PI_FLAG_ONLINK;
 340                         pfx->autoconfflg = val & ND_OPT_PI_FLAG_AUTO;
 341 #ifdef MIP6
 342                         pfx->routeraddr = val & ND_OPT_PI_FLAG_ROUTER;
 343 #endif
 344
 345                         makeentry(entbuf, i, "vltime", added);
 346                         MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME);
 347                         if (val64 < 0 || val64 > 0xffffffff) {
 348                                 syslog(LOG_ERR,
 349                                        "<%s> vltime out of range",
 350                                        __FUNCTION__);
 351                                 exit(1);
 352                         }
 353                         pfx->validlifetime = (u_int32_t)val64;
 354
 355                         makeentry(entbuf, i, "vltimedecr", added);
 356                         if (agetflag(entbuf)) {
 357                                 struct timeval now;
 358                                 gettimeofday(&now, 0);
 359                                 pfx->vltimeexpire =
 360                                         now.tv_sec + pfx->validlifetime;
 361                         }
 362
 363                         makeentry(entbuf, i, "pltime", added);
 364                         MAYHAVE(val64, entbuf, DEF_ADVPREFERREDLIFETIME);
 365                         if (val64 < 0 || val64 > 0xffffffff) {
 366                                 syslog(LOG_ERR,
 367                                        "<%s> pltime out of range",
 368                                        __FUNCTION__);
 369                                 exit(1);
 370                         }
 371                         pfx->preflifetime = (u_int32_t)val64;
 372
 373                         makeentry(entbuf, i, "pltimedecr", added);
 374                         if (agetflag(entbuf)) {
 375                                 struct timeval now;
 376                                 gettimeofday(&now, 0);
 377                                 pfx->pltimeexpire =
 378                                         now.tv_sec + pfx->preflifetime;
 379                         }
 380
 381                         makeentry(entbuf, i, "addr", added);
 382                         addr = (char *)agetstr(entbuf, &bp);
 383                         if (addr == NULL) {
 384                                 syslog(LOG_ERR,
 385                                        "<%s> need %s as an prefix for "
 386                                        "interface %s",
 387                                        __FUNCTION__, entbuf, intface);
 388                                 exit(1);
 389                         }
 390                         if (inet_pton(AF_INET6, addr,
 391                                       &pfx->prefix) != 1) {
 392                                 syslog(LOG_ERR,
 393                                        "<%s> inet_pton failed for %s",
 394                                        __FUNCTION__, addr);
 395                                 exit(1);
 396                         }
 397                         if (IN6_IS_ADDR_MULTICAST(&pfx->prefix)) {
 398                                 syslog(LOG_ERR,
 399                                        "<%s> multicast prefix(%s) must "
 400                                        "not be advertised (IF=%s)",
 401                                        __FUNCTION__, addr, intface);
 402                                 exit(1);
 403                         }
 404                         if (IN6_IS_ADDR_LINKLOCAL(&pfx->prefix))
 405                                 syslog(LOG_NOTICE,
 406                                        "<%s> link-local prefix(%s) will be"
 407                                        " advertised on %s",
 408                                        __FUNCTION__, addr, intface);
 409                 }
 410         }
 411
 412         MAYHAVE(val, "mtu", 0);
 413         if (val < 0 || val > 0xffffffff) {
 414                 syslog(LOG_ERR,
 415                        "<%s> mtu out of range", __FUNCTION__);
 416                 exit(1);
 417         }
 418         tmp->linkmtu = (u_int32_t)val;
 419         if (tmp->linkmtu == 0) {
 420                 char *mtustr;
 421
 422                 if ((mtustr = (char *)agetstr("mtu", &bp)) &&
 423                     strcmp(mtustr, "auto") == 0)
 424                         tmp->linkmtu = tmp->phymtu;
 425         }
 426         else if (tmp->linkmtu < IPV6_MMTU || tmp->linkmtu > tmp->phymtu) {
 427                 syslog(LOG_ERR,
 428                        "<%s> advertised link mtu must be between"
 429                        " least MTU and physical link MTU",
 430                        __FUNCTION__);
 431                 exit(1);
 432         }
 433
 434         /* route information */
 435
 436         MAYHAVE(val, "routes", 0);
 437         if (val < 0 || val > 0xffffffff) {
 438                 syslog(LOG_ERR,
 439                        "<%s> number of route information improper", __FUNCTION__);
 440                 exit(1);
 441         }
 442         tmp->routes = val;
 443         for (i = 0; i < tmp->routes; i++) {
 444                 struct rtinfo *rti;
 445                 char entbuf[256];
 446                 int added = (tmp->routes > 1) ? 1 : 0;
 447
 448                 /* allocate memory to store prefix information */
 449                 if ((rti = malloc(sizeof(struct rtinfo))) == NULL) {
 450                         syslog(LOG_ERR,
 451                                "<%s> can't allocate enough memory",
 452                                __FUNCTION__);
 453                         exit(1);
 454                 }
 455                 memset(rti, 0, sizeof(*rti));
 456
 457                 /* link into chain */
 458                 insque(rti, &tmp->route);
 459
 460                 makeentry(entbuf, i, "rtrplen", added);
 461                 MAYHAVE(val, entbuf, 64);
 462                 if (val < 0 || val > 128) {
 463                         syslog(LOG_ERR,
 464                                "<%s> prefixlen out of range",
 465                                __FUNCTION__);
 466                         exit(1);
 467                 }
 468                 rti->prefixlen = (int)val;
 469
 470                 makeentry(entbuf, i, "rtrflags", added);
 471                 MAYHAVE(val, entbuf, 0);
 472                 rti->rtpref = val & ND_RA_FLAG_RTPREF_MASK;
 473                 if (rti->rtpref == ND_RA_FLAG_RTPREF_RSV) {
 474                         syslog(LOG_ERR, "<%s> invalid router preference",
 475                                __FUNCTION__);
 476                         exit(1);
 477                 }
 478
 479                 makeentry(entbuf, i, "rtrltime", added);
 480                 /*
 481                  * XXX: since default value of route lifetime is not defined in
 482                  * draft-draves-route-selection-01.txt, I took the default
 483                  * value of valid lifetime of prefix as its default.
 484                  * It need be much considered.
 485                  */
 486                 MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME);
 487                 if (val64 < 0 || val64 > 0xffffffff) {
 488                         syslog(LOG_ERR,
 489                                "<%s> rtrltime out of range",
 490                                __FUNCTION__);
 491                         exit(1);
 492                 }
 493                 rti->ltime = (u_int32_t)val64;
 494
 495                 makeentry(entbuf, i, "rtrprefix", added);
 496                 addr = (char *)agetstr(entbuf, &bp);
 497                 if (addr == NULL) {
 498                         syslog(LOG_ERR,
 499                                "<%s> need %s as an route for "
 500                                "interface %s",
 501                                __FUNCTION__, entbuf, intface);
 502                         exit(1);
 503                 }
 504                 if (inet_pton(AF_INET6, addr, &rti->prefix) != 1) {
 505                         syslog(LOG_ERR,
 506                                "<%s> inet_pton failed for %s",
 507                                __FUNCTION__, addr);
 508                         exit(1);
 509                 }
 510 #if 0
 511                 /*
 512                  * XXX: currently there's no restriction in route information
 513                  * prefix according to draft-draves-route-selection-01.txt,
 514                  * however I think the similar restriction be necessary.
 515                  */
 516                 MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME);
 517                 if (IN6_IS_ADDR_MULTICAST(&rti->prefix)) {
 518                         syslog(LOG_ERR,
 519                                "<%s> multicast route (%s) must "
 520                                "not be advertised (IF=%s)",
 521                                __FUNCTION__, addr, intface);
 522                         exit(1);
 523                 }
 524                 if (IN6_IS_ADDR_LINKLOCAL(&rti->prefix)) {
 525                         syslog(LOG_NOTICE,
 526                                "<%s> link-local route (%s) must "
 527                                "not be advertised on %s",
 528                                __FUNCTION__, addr, intface);
 529                         exit(1);
 530                 }
 531 #endif
 532         }
 533
 534         /* okey */
 535         tmp->next = ralist;
 536         ralist = tmp;
 537
 538         /* construct the sending packet */
 539         make_packet(tmp);
 540
 541         /* set timer */
 542         tmp->timer = rtadvd_add_timer(ra_timeout, ra_timer_update,
 543                                       tmp, tmp);
 544         ra_timer_update((void *)tmp, &tmp->timer->tm);
 545         rtadvd_set_timer(&tmp->timer->tm, tmp->timer);
 546 }
 547
 548 static void
 549 get_prefix(struct rainfo *rai)
 550 {
 551         struct ifaddrs *ifap, *ifa;
 552         struct prefix *pp;
 553         struct in6_addr *a;
 554         u_char *p, *ep, *m, *lim;
 555         u_char ntopbuf[INET6_ADDRSTRLEN];
 556
 557         if (getifaddrs(&ifap) < 0) {
 558                 syslog(LOG_ERR,
 559                        "<%s> can't get interface addresses",
 560                        __FUNCTION__);
 561                 exit(1);
 562         }
 563         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 564                 if (strcmp(ifa->ifa_name, rai->ifname) != 0)
 565                         continue;
 566                 if (ifa->ifa_addr->sa_family != AF_INET6)
 567                         continue;
 568                 a = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
 569                 if (IN6_IS_ADDR_LINKLOCAL(a))
 570                         continue;
 571
 572                 /* allocate memory to store prefix info. */
 573                 if ((pp = malloc(sizeof(*pp))) == NULL) {
 574                         syslog(LOG_ERR,
 575                                "<%s> can't get allocate buffer for prefix",
 576                                __FUNCTION__);
 577                         exit(1);
 578                 }
 579                 memset(pp, 0, sizeof(*pp));
 580
 581                 /* set prefix length */
 582                 m = (u_char *)&((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
 583                 lim = (u_char *)(ifa->ifa_netmask) + ifa->ifa_netmask->sa_len;
 584                 pp->prefixlen = prefixlen(m, lim);
 585                 if (pp->prefixlen < 0 || pp->prefixlen > 128) {
 586                         syslog(LOG_ERR,
 587                                "<%s> failed to get prefixlen "
 588                                "or prefix is invalid",
 589                                __FUNCTION__);
 590                         exit(1);
 591                 }
 592
 593                 /* set prefix, sweep bits outside of prefixlen */
 594                 memcpy(&pp->prefix, a, sizeof(*a));
 595                 p = (u_char *)&pp->prefix;
 596                 ep = (u_char *)(&pp->prefix + 1);
 597                 while (m < lim)
 598                         *p++ &= *m++;
 599                 while (p < ep)
 600                         *p++ = 0x00;
 601
 602                 if (!inet_ntop(AF_INET6, &pp->prefix, ntopbuf,
 603                     sizeof(ntopbuf))) {
 604                         syslog(LOG_ERR, "<%s> inet_ntop failed", __FUNCTION__);
 605                         exit(1);
 606                 }
 607                 syslog(LOG_DEBUG,
 608                        "<%s> add %s/%d to prefix list on %s",
 609                        __FUNCTION__, ntopbuf, pp->prefixlen, rai->ifname);
 610
 611                 /* set other fields with protocol defaults */
 612                 pp->validlifetime = DEF_ADVVALIDLIFETIME;
 613                 pp->preflifetime = DEF_ADVPREFERREDLIFETIME;
 614                 pp->onlinkflg = 1;
 615                 pp->autoconfflg = 1;
 616                 pp->origin = PREFIX_FROM_KERNEL;
 617
 618                 /* link into chain */
 619                 insque(pp, &rai->prefix);
 620
 621                 /* counter increment */
 622                 rai->pfxs++;
 623         }
 624
 625         freeifaddrs(ifap);
 626 }
 627
 628 static void
 629 makeentry(buf, id, string, add)
 630     char *buf, *string;
 631     int id, add;
 632 {
 633         strcpy(buf, string);
 634         if (add) {
 635                 char *cp;
 636
 637                 cp = (char *)index(buf, '\0');
 638                 cp += sprintf(cp, "%d", id);
 639                 *cp = '\0';
 640         }
 641 }
 642
 643 /*
 644  * Add a prefix to the list of specified interface and reconstruct
 645  * the outgoing packet.
 646  * The prefix must not be in the list.
 647  * XXX: other parameter of the prefix(e.g. lifetime) shoule be
 648  * able to be specified.
 649  */
 650 static void
 651 add_prefix(struct rainfo *rai, struct in6_prefixreq *ipr)
 652 {
 653         struct prefix *prefix;
 654         u_char ntopbuf[INET6_ADDRSTRLEN];
 655
 656         if ((prefix = malloc(sizeof(*prefix))) == NULL) {
 657                 syslog(LOG_ERR, "<%s> memory allocation failed",
 658                        __FUNCTION__);
 659                 return;         /* XXX: error or exit? */
 660         }
 661         memset(prefix, 0, sizeof(*prefix));
 662         prefix->prefix = ipr->ipr_prefix.sin6_addr;
 663         prefix->prefixlen = ipr->ipr_plen;
 664         prefix->validlifetime = ipr->ipr_vltime;
 665         prefix->preflifetime = ipr->ipr_pltime;
 666         prefix->onlinkflg = ipr->ipr_raf_onlink;
 667         prefix->autoconfflg = ipr->ipr_raf_auto;
 668         prefix->origin = PREFIX_FROM_DYNAMIC;
 669
 670         insque(prefix, &rai->prefix);
 671
 672         syslog(LOG_DEBUG, "<%s> new prefix %s/%d was added on %s",
 673                __FUNCTION__, inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr,
 674                                        ntopbuf, INET6_ADDRSTRLEN),
 675                ipr->ipr_plen, rai->ifname);
 676
 677         /* free the previous packet */
 678         free(rai->ra_data);
 679         rai->ra_data = NULL;
 680
 681         /* reconstruct the packet */
 682         rai->pfxs++;
 683         make_packet(rai);
 684
 685         /*
 686          * reset the timer so that the new prefix will be advertised quickly.
 687          */
 688         rai->initcounter = 0;
 689         ra_timer_update((void *)rai, &rai->timer->tm);
 690         rtadvd_set_timer(&rai->timer->tm, rai->timer);
 691 }
 692
 693 /*
 694  * Delete a prefix to the list of specified interface and reconstruct
 695  * the outgoing packet.
 696  * The prefix must be in the list.
 697  */
 698 void
 699 delete_prefix(struct rainfo *rai, struct prefix *prefix)
 700 {
 701         u_char ntopbuf[INET6_ADDRSTRLEN];
 702
 703         remque(prefix);
 704         syslog(LOG_DEBUG, "<%s> prefix %s/%d was deleted on %s",
 705                __FUNCTION__, inet_ntop(AF_INET6, &prefix->prefix,
 706                                        ntopbuf, INET6_ADDRSTRLEN),
 707                prefix->prefixlen, rai->ifname);
 708         free(prefix);
 709         rai->pfxs--;
 710         make_packet(rai);
 711 }
 712
 713 /*
 714  * Try to get an in6_prefixreq contents for a prefix which matches
 715  * ipr->ipr_prefix and ipr->ipr_plen and belongs to
 716  * the interface whose name is ipr->ipr_name[].
 717  */
 718 static int
 719 init_prefix(struct in6_prefixreq *ipr)
 720 {
 721         int s;
 722
 723         if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 724                 syslog(LOG_ERR, "<%s> socket: %s", __FUNCTION__,
 725                        strerror(errno));
 726                 exit(1);
 727         }
 728
 729         if (ioctl(s, SIOCGIFPREFIX_IN6, (caddr_t)ipr) < 0) {
 730                 syslog(LOG_INFO, "<%s> ioctl:SIOCGIFPREFIX %s", __FUNCTION__,
 731                        strerror(errno));
 732
 733                 ipr->ipr_vltime = DEF_ADVVALIDLIFETIME;
 734                 ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME;
 735                 ipr->ipr_raf_onlink = 1;
 736                 ipr->ipr_raf_auto = 1;
 737                 /* omit other field initialization */
 738         }
 739         else if (ipr->ipr_origin < PR_ORIG_RR) {
 740                 u_char ntopbuf[INET6_ADDRSTRLEN];
 741
 742                 syslog(LOG_WARNING, "<%s> Added prefix(%s)'s origin %d is"
 743                        "lower than PR_ORIG_RR(router renumbering)."
 744                        "This should not happen if I am router", __FUNCTION__,
 745                        inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, ntopbuf,
 746                                  sizeof(ntopbuf)), ipr->ipr_origin);
 747                 close(s);
 748                 return 1;
 749         }
 750
 751         close(s);
 752         return 0;
 753 }
 754
 755 void
 756 make_prefix(struct rainfo *rai, int ifindex, struct in6_addr *addr, int plen)
 757 {
 758         struct in6_prefixreq ipr;
 759
 760         memset(&ipr, 0, sizeof(ipr));
 761         if (if_indextoname(ifindex, ipr.ipr_name) == NULL) {
 762                 syslog(LOG_ERR, "<%s> Prefix added interface No.%d doesn't"
 763                        "exist. This should not happen! %s", __FUNCTION__,
 764                        ifindex, strerror(errno));
 765                 exit(1);
 766         }
 767         ipr.ipr_prefix.sin6_len = sizeof(ipr.ipr_prefix);
 768         ipr.ipr_prefix.sin6_family = AF_INET6;
 769         ipr.ipr_prefix.sin6_addr = *addr;
 770         ipr.ipr_plen = plen;
 771
 772         if (init_prefix(&ipr))
 773                 return; /* init failed by some error */
 774         add_prefix(rai, &ipr);
 775 }
 776
 777 void
 778 make_packet(struct rainfo *rainfo)
 779 {
 780         size_t packlen, lladdroptlen = 0;
 781         char *buf;
 782         struct nd_router_advert *ra;
 783         struct nd_opt_prefix_info *ndopt_pi;
 784         struct nd_opt_mtu *ndopt_mtu;
 785 #ifdef MIP6
 786         struct nd_opt_advinterval *ndopt_advint;
 787         struct nd_opt_homeagent_info *ndopt_hai;
 788 #endif
 789         struct nd_opt_route_info *ndopt_rti;
 790         struct prefix *pfx;
 791         struct rtinfo *rti;
 792
 793         /* calculate total length */
 794         packlen = sizeof(struct nd_router_advert);
 795         if (rainfo->advlinkopt) {
 796                 if ((lladdroptlen = lladdropt_length(rainfo->sdl)) == 0) {
 797                         syslog(LOG_INFO,
 798                                "<%s> link-layer address option has"
 799                                " null length on %s."
 800                                " Treat as not included.",
 801                                __FUNCTION__, rainfo->ifname);
 802                         rainfo->advlinkopt = 0;
 803                 }
 804                 packlen += lladdroptlen;
 805         }
 806         if (rainfo->pfxs)
 807                 packlen += sizeof(struct nd_opt_prefix_info) * rainfo->pfxs;
 808         if (rainfo->linkmtu)
 809                 packlen += sizeof(struct nd_opt_mtu);
 810 #ifdef MIP6
 811         if (mobileip6 && rainfo->maxinterval)
 812                 packlen += sizeof(struct nd_opt_advinterval);
 813         if (mobileip6 && rainfo->hatime)
 814                 packlen += sizeof(struct nd_opt_homeagent_info);
 815 #endif
 816 #ifdef ND_OPT_ROUTE_INFO
 817         for (rti = rainfo->route.next; rti != &rainfo->route; rti = rti->next)
 818                 packlen += sizeof(struct nd_opt_route_info) +
 819                            ((rti->prefixlen + 0x3f) >> 6) * 8;
 820 #endif
 821
 822         /* allocate memory for the packet */
 823         if ((buf = malloc(packlen)) == NULL) {
 824                 syslog(LOG_ERR,
 825                        "<%s> can't get enough memory for an RA packet",
 826                        __FUNCTION__);
 827                 exit(1);
 828         }
 829         if (rainfo->ra_data) {
 830                 /* free the previous packet */
 831                 free(rainfo->ra_data);
 832                 rainfo->ra_data = NULL;
 833         }
 834         rainfo->ra_data = buf;
 835         /* XXX: what if packlen > 576? */
 836         rainfo->ra_datalen = packlen;
 837
 838         /*
 839          * construct the packet
 840          */
 841         ra = (struct nd_router_advert *)buf;
 842         ra->nd_ra_type = ND_ROUTER_ADVERT;
 843         ra->nd_ra_code = 0;
 844         ra->nd_ra_cksum = 0;
 845         ra->nd_ra_curhoplimit = (u_int8_t)(0xff & rainfo->hoplimit);
 846         ra->nd_ra_flags_reserved = 0; /* just in case */
 847         /*
 848          * XXX: the router preference field, which is a 2-bit field, should be
 849          * initialized before other fields.
 850          */
 851         ra->nd_ra_flags_reserved = 0xff & rainfo->rtpref;
 852         ra->nd_ra_flags_reserved |=
 853                 rainfo->managedflg ? ND_RA_FLAG_MANAGED : 0;
 854         ra->nd_ra_flags_reserved |=
 855                 rainfo->otherflg ? ND_RA_FLAG_OTHER : 0;
 856 #ifdef MIP6
 857         ra->nd_ra_flags_reserved |=
 858                 rainfo->haflg ? ND_RA_FLAG_HA : 0;
 859 #endif
 860         ra->nd_ra_router_lifetime = htons(rainfo->lifetime);
 861         ra->nd_ra_reachable = htonl(rainfo->reachabletime);
 862         ra->nd_ra_retransmit = htonl(rainfo->retranstimer);
 863         buf += sizeof(*ra);
 864
 865         if (rainfo->advlinkopt) {
 866                 lladdropt_fill(rainfo->sdl, (struct nd_opt_hdr *)buf);
 867                 buf += lladdroptlen;
 868         }
 869
 870         if (rainfo->linkmtu) {
 871                 ndopt_mtu = (struct nd_opt_mtu *)buf;
 872                 ndopt_mtu->nd_opt_mtu_type = ND_OPT_MTU;
 873                 ndopt_mtu->nd_opt_mtu_len = 1;
 874                 ndopt_mtu->nd_opt_mtu_reserved = 0;
 875                 ndopt_mtu->nd_opt_mtu_mtu = htonl(rainfo->linkmtu);
 876                 buf += sizeof(struct nd_opt_mtu);
 877         }
 878
 879 #ifdef MIP6
 880         if (mobileip6 && rainfo->maxinterval) {
 881                 ndopt_advint = (struct nd_opt_advinterval *)buf;
 882                 ndopt_advint->nd_opt_adv_type = ND_OPT_ADVINTERVAL;
 883                 ndopt_advint->nd_opt_adv_len = 1;
 884                 ndopt_advint->nd_opt_adv_reserved = 0;
 885                 ndopt_advint->nd_opt_adv_interval = htonl(rainfo->maxinterval *
 886                                                           1000);
 887                 buf += sizeof(struct nd_opt_advinterval);
 888         }
 889 #endif
 890
 891 #ifdef MIP6
 892         if (rainfo->hatime) {
 893                 ndopt_hai = (struct nd_opt_homeagent_info *)buf;
 894                 ndopt_hai->nd_opt_hai_type = ND_OPT_HOMEAGENT_INFO;
 895                 ndopt_hai->nd_opt_hai_len = 1;
 896                 ndopt_hai->nd_opt_hai_reserved = 0;
 897                 ndopt_hai->nd_opt_hai_preference = htons(rainfo->hapref);
 898                 ndopt_hai->nd_opt_hai_lifetime = htons(rainfo->hatime);
 899                 buf += sizeof(struct nd_opt_homeagent_info);
 900         }
 901 #endif
 902
 903         for (pfx = rainfo->prefix.next;
 904              pfx != &rainfo->prefix; pfx = pfx->next) {
 905                 u_int32_t vltime, pltime;
 906                 struct timeval now;
 907
 908                 ndopt_pi = (struct nd_opt_prefix_info *)buf;
 909                 ndopt_pi->nd_opt_pi_type = ND_OPT_PREFIX_INFORMATION;
 910                 ndopt_pi->nd_opt_pi_len = 4;
 911                 ndopt_pi->nd_opt_pi_prefix_len = pfx->prefixlen;
 912                 ndopt_pi->nd_opt_pi_flags_reserved = 0;
 913                 if (pfx->onlinkflg)
 914                         ndopt_pi->nd_opt_pi_flags_reserved |=
 915                                 ND_OPT_PI_FLAG_ONLINK;
 916                 if (pfx->autoconfflg)
 917                         ndopt_pi->nd_opt_pi_flags_reserved |=
 918                                 ND_OPT_PI_FLAG_AUTO;
 919 #ifdef MIP6
 920                 if (pfx->routeraddr)
 921                         ndopt_pi->nd_opt_pi_flags_reserved |=
 922                                 ND_OPT_PI_FLAG_ROUTER;
 923 #endif
 924                 if (pfx->vltimeexpire || pfx->pltimeexpire)
 925                         gettimeofday(&now, NULL);
 926                 if (pfx->vltimeexpire == 0)
 927                         vltime = pfx->validlifetime;
 928                 else
 929                         vltime = (pfx->vltimeexpire > now.tv_sec) ?
 930                                 pfx->vltimeexpire - now.tv_sec : 0;
 931                 if (pfx->pltimeexpire == 0)
 932                         pltime = pfx->preflifetime;
 933                 else
 934                         pltime = (pfx->pltimeexpire > now.tv_sec) ?
 935                                 pfx->pltimeexpire - now.tv_sec : 0;
 936                 if (vltime < pltime) {
 937                         /*
 938                          * this can happen if vltime is decrement but pltime
 939                          * is not.
 940                          */
 941                         pltime = vltime;
 942                 }
 943                 ndopt_pi->nd_opt_pi_valid_time = htonl(vltime);
 944                 ndopt_pi->nd_opt_pi_preferred_time = htonl(pltime);
 945                 ndopt_pi->nd_opt_pi_reserved2 = 0;
 946                 ndopt_pi->nd_opt_pi_prefix = pfx->prefix;
 947
 948                 buf += sizeof(struct nd_opt_prefix_info);
 949         }
 950
 951 #ifdef ND_OPT_ROUTE_INFO
 952         for (rti = rainfo->route.next; rti != &rainfo->route; rti = rti->next) {
 953                 u_int8_t psize = (rti->prefixlen + 0x3f) >> 6;
 954
 955                 ndopt_rti = (struct nd_opt_route_info *)buf;
 956                 ndopt_rti->nd_opt_rti_type = ND_OPT_ROUTE_INFO;
 957                 ndopt_rti->nd_opt_rti_len = 1 + psize;
 958                 ndopt_rti->nd_opt_rti_prefixlen = rti->prefixlen;
 959                 ndopt_rti->nd_opt_rti_flags = 0xff & rti->rtpref;
 960                 ndopt_rti->nd_opt_rti_lifetime = rti->ltime;
 961                 memcpy(ndopt_rti + 1, &rti->prefix, psize * 8);
 962                 buf += sizeof(struct nd_opt_route_info) + psize * 8;
 963         }
 964 #endif
 965
 966         return;
 967 }
 968
 969 static int
 970 getinet6sysctl(int code)
 971 {
 972         int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
 973         int value;
 974         size_t size;
 975
 976         mib[3] = code;
 977         size = sizeof(value);
 978         if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0)
 979             < 0) {
 980                 syslog(LOG_ERR, "<%s>: failed to get ip6 sysctl(%d): %s",
 981                        __FUNCTION__, code,
 982                        strerror(errno));
 983                 return(-1);
 984         }
 985         else
 986                 return(value);
 987 }