sys/netinet6/in6_prefix.c

   1 /*      $FreeBSD: src/sys/netinet6/in6_prefix.c,v 1.4.2.3 2001/07/03 11:01:52 ume Exp $ */
   2 /*      $DragonFly: src/sys/netinet6/in6_prefix.c,v 1.12 2008/01/05 14:02:40 swildner Exp $     */
   3 /*      $KAME: in6_prefix.c,v 1.47 2001/03/25 08:41:39 itojun Exp $     */
   4
   5 /*
   6  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the project nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Copyright (c) 1982, 1986, 1991, 1993
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. All advertising materials mentioning features or use of this software
  47  *    must display the following acknowledgement:
  48  *      This product includes software developed by the University of
  49  *      California, Berkeley and its contributors.
  50  * 4. Neither the name of the University nor the names of its contributors
  51  *    may be used to endorse or promote products derived from this software
  52  *    without specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  64  * SUCH DAMAGE.
  65  *
  66  *      @(#)in.c        8.2 (Berkeley) 11/15/93
  67  */
  68
  69 #include <sys/param.h>
  70 #include <sys/malloc.h>
  71 #include <sys/kernel.h>
  72 #include <sys/socket.h>
  73 #include <sys/socketvar.h>
  74 #include <sys/sockio.h>
  75 #include <sys/systm.h>
  76 #include <sys/syslog.h>
  77 #include <sys/proc.h>
  78 #include <sys/thread2.h>
  79
  80 #include <net/if.h>
  81
  82 #include <netinet/in.h>
  83 #include <netinet/in_var.h>
  84 #include <netinet/ip6.h>
  85 #include <netinet6/in6_prefix.h>
  86 #include <netinet6/ip6_var.h>
  87
  88 static MALLOC_DEFINE(M_IP6RR, "ip6rr", "IPv6 Router Renumbering Prefix");
  89 static MALLOC_DEFINE(M_RR_ADDR, "rp_addr", "IPv6 Router Renumbering Ifid");
  90
  91 struct rr_prhead rr_prefix;
  92
  93 struct callout in6_rr_timer_ch;
  94
  95 #include <net/net_osdep.h>
  96
  97 static void     add_each_addr (struct socket *so, struct rr_prefix *rpp,
  98                                    struct rp_addr *rap);
  99 static int create_ra_entry (struct rp_addr **rapp);
 100 static int add_each_prefix (struct socket *so, struct rr_prefix *rpp);
 101 static void free_rp_entries (struct rr_prefix *rpp);
 102 static int link_stray_ia6s (struct rr_prefix *rpp);
 103 static void     rp_remove (struct rr_prefix *rpp);
 104
 105 /*
 106  * Copy bits from src to tgt, from off bit for len bits.
 107  * Caller must specify collect tgtsize and srcsize.
 108  */
 109 static void
 110 bit_copy(char *tgt, u_int tgtsize, char *src, u_int srcsize,
 111          u_int off, u_int len)
 112 {
 113         char *sp, *tp;
 114
 115         /* arg values check */
 116         if (srcsize < off || srcsize < (off + len) ||
 117             tgtsize < off || tgtsize < (off + len)) {
 118                 log(LOG_ERR,
 119                     "in6_prefix.c: bit_copy: invalid args: srcsize %d,\n"
 120                     "tgtsize %d, off %d, len %d\n", srcsize, tgtsize, off,
 121                     len);
 122                 return;
 123         }
 124
 125         /* search start point */
 126         for (sp = src, tp = tgt; off >= 8; sp++, tp++)
 127                 off-=8;
 128         /* copy starting bits */
 129         if (off) {
 130                 char setbit;
 131                 int startbits;
 132
 133                 startbits = min((8 - off), len);
 134
 135                 for (setbit = (0x80 >> off); startbits;
 136                      setbit >>= 1, startbits--, len--)
 137                                 *tp  |= (setbit & *sp);
 138                 tp++;
 139                 sp++;
 140         }
 141         /* copy midium bits */
 142         for (; len >= 8; sp++, tp++) {
 143                 *tp = *sp;
 144                 len-=8;
 145         }
 146         /* copy ending bits */
 147         if (len) {
 148                 char setbit;
 149
 150                 for (setbit = 0x80; len; setbit >>= 1, len--)
 151                         *tp  |= (setbit & *sp);
 152         }
 153 }
 154
 155 static struct ifprefix *
 156 in6_prefixwithifp(struct ifnet *ifp, int plen, struct in6_addr *dst)
 157 {
 158         struct ifprefix *ifpr;
 159
 160         /* search matched prefix */
 161         for (ifpr = TAILQ_FIRST(&ifp->if_prefixhead); ifpr;
 162              ifpr = TAILQ_NEXT(ifpr, ifpr_list))
 163         {
 164                 if (ifpr->ifpr_prefix->sa_family != AF_INET6 ||
 165                     ifpr->ifpr_type != IN6_PREFIX_RR)
 166                         continue;
 167                 if (plen <= in6_matchlen(dst, IFPR_IN6(ifpr)))
 168                         break;
 169         }
 170         return (ifpr);
 171 }
 172
 173 /*
 174  * Search prefix which matches arg prefix as specified in
 175  * draft-ietf-ipngwg-router-renum-08.txt
 176  */
 177 static struct rr_prefix *
 178 search_matched_prefix(struct ifnet *ifp, struct in6_prefixreq *ipr)
 179 {
 180         struct ifprefix *ifpr;
 181         struct ifaddr *ifa;
 182         struct rr_prefix *rpp;
 183
 184         /* search matched prefix */
 185         ifpr = in6_prefixwithifp(ifp, ipr->ipr_plen,
 186                                  &ipr->ipr_prefix.sin6_addr);
 187         if (ifpr != NULL)
 188                 return ifpr2rp(ifpr);
 189
 190         /*
 191          * search matched addr, and then search prefix
 192          * which matches the addr
 193          */
 194
 195         TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
 196         {
 197                 if (ifa->ifa_addr->sa_family != AF_INET6)
 198                         continue;
 199                 if (ipr->ipr_plen <=
 200                     in6_matchlen(&ipr->ipr_prefix.sin6_addr, IFA_IN6(ifa)))
 201                         break;
 202         }
 203         if (ifa == NULL)
 204                 return NULL;
 205
 206         rpp = ifpr2rp(((struct in6_ifaddr *)ifa)->ia6_ifpr);
 207         if (rpp != 0)
 208                 return rpp;
 209
 210         for (ifpr = TAILQ_FIRST(&ifp->if_prefixhead); ifpr;
 211              ifpr = TAILQ_NEXT(ifpr, ifpr_list))
 212         {
 213                 if (ifpr->ifpr_prefix->sa_family != AF_INET6 ||
 214                     ifpr->ifpr_type != IN6_PREFIX_RR)
 215                         continue;
 216                 if (ifpr->ifpr_plen <= in6_matchlen(IFA_IN6(ifa),
 217                                                     IFPR_IN6(ifpr)))
 218                         break;
 219         }
 220         if (ifpr != NULL)
 221                 log(LOG_ERR,  "in6_prefix.c: search_matched_prefix: addr %s"
 222                     "has no pointer to prefix %s\n", ip6_sprintf(IFA_IN6(ifa)),
 223                     ip6_sprintf(IFPR_IN6(ifpr)));
 224         return ifpr2rp(ifpr);
 225 }
 226
 227 /*
 228  * Search prefix which matches arg prefix as specified in
 229  * draft-ietf-ipngwg-router-renum-08.txt, and mark it if exists.
 230  * Return 1 if anything matched, and 0 if nothing matched.
 231  */
 232 static int
 233 mark_matched_prefixes(u_long cmd, struct ifnet *ifp, struct in6_rrenumreq *irr)
 234 {
 235         struct ifprefix *ifpr;
 236         struct ifaddr *ifa;
 237         int matchlen, matched = 0;
 238
 239         /* search matched prefixes */
 240         for (ifpr = TAILQ_FIRST(&ifp->if_prefixhead); ifpr;
 241              ifpr = TAILQ_NEXT(ifpr, ifpr_list))
 242         {
 243                 if (ifpr->ifpr_prefix->sa_family != AF_INET6 ||
 244                     ifpr->ifpr_type != IN6_PREFIX_RR)
 245                         continue;
 246                 matchlen = in6_matchlen(&irr->irr_matchprefix.sin6_addr,
 247                                         IFPR_IN6(ifpr));
 248                 if (irr->irr_m_minlen > ifpr->ifpr_plen ||
 249                     irr->irr_m_maxlen < ifpr->ifpr_plen ||
 250                     irr->irr_m_len > matchlen)
 251                         continue;
 252                 matched = 1;
 253                 ifpr2rp(ifpr)->rp_statef_addmark = 1;
 254                 if (cmd == SIOCCIFPREFIX_IN6)
 255                         ifpr2rp(ifpr)->rp_statef_delmark = 1;
 256         }
 257
 258         /*
 259          * search matched addr, and then search prefixes
 260          * which matche the addr
 261          */
 262         TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
 263         {
 264                 struct rr_prefix *rpp;
 265
 266                 if (ifa->ifa_addr->sa_family != AF_INET6)
 267                         continue;
 268                 matchlen = in6_matchlen(&irr->irr_matchprefix.sin6_addr,
 269                                         IFA_IN6(ifa));
 270                 if (irr->irr_m_minlen > matchlen ||
 271                     irr->irr_m_maxlen < matchlen || irr->irr_m_len > matchlen)
 272                         continue;
 273                 rpp = ifpr2rp(((struct in6_ifaddr *)ifa)->ia6_ifpr);
 274                 if (rpp != 0) {
 275                         matched = 1;
 276                         rpp->rp_statef_addmark = 1;
 277                         if (cmd == SIOCCIFPREFIX_IN6)
 278                                 rpp->rp_statef_delmark = 1;
 279                 } else
 280                         log(LOG_WARNING, "in6_prefix.c: mark_matched_prefixes:"
 281                             "no back pointer to ifprefix for %s. "
 282                             "ND autoconfigured addr?\n",
 283                             ip6_sprintf(IFA_IN6(ifa)));
 284         }
 285         return matched;
 286 }
 287
 288 /*
 289  * Mark global prefixes as to be deleted.
 290  */
 291 static void
 292 delmark_global_prefixes(struct ifnet *ifp, struct in6_rrenumreq *irr)
 293 {
 294         struct ifprefix *ifpr;
 295
 296         /* search matched prefixes */
 297         for (ifpr = TAILQ_FIRST(&ifp->if_prefixhead); ifpr;
 298              ifpr = TAILQ_NEXT(ifpr, ifpr_list))
 299         {
 300                 if (ifpr->ifpr_prefix->sa_family != AF_INET6 ||
 301                     ifpr->ifpr_type != IN6_PREFIX_RR)
 302                         continue;
 303                 /* mark delete global prefix */
 304                 if (in6_addrscope(RP_IN6(ifpr2rp(ifpr))) ==
 305                     IPV6_ADDR_SCOPE_GLOBAL)
 306                         ifpr2rp(ifpr)->rp_statef_delmark = 1;
 307         }
 308 }
 309
 310 /* Unmark prefixes */
 311 static void
 312 unmark_prefixes(struct ifnet *ifp)
 313 {
 314         struct ifprefix *ifpr;
 315
 316         /* unmark all prefix */
 317         for (ifpr = TAILQ_FIRST(&ifp->if_prefixhead); ifpr;
 318              ifpr = TAILQ_NEXT(ifpr, ifpr_list))
 319         {
 320                 if (ifpr->ifpr_prefix->sa_family != AF_INET6 ||
 321                     ifpr->ifpr_type != IN6_PREFIX_RR)
 322                         continue;
 323                 /* unmark prefix */
 324                 ifpr2rp(ifpr)->rp_statef_addmark = 0;
 325                 ifpr2rp(ifpr)->rp_statef_delmark = 0;
 326         }
 327 }
 328
 329 static void
 330 init_prefix_ltimes(struct rr_prefix *rpp)
 331 {
 332
 333         if (rpp->rp_pltime == RR_INFINITE_LIFETIME ||
 334             rpp->rp_rrf_decrprefd == 0)
 335                 rpp->rp_preferred = 0;
 336         else
 337                 rpp->rp_preferred = time_second + rpp->rp_pltime;
 338         if (rpp->rp_vltime == RR_INFINITE_LIFETIME ||
 339             rpp->rp_rrf_decrvalid == 0)
 340                 rpp->rp_expire = 0;
 341         else
 342                 rpp->rp_expire = time_second + rpp->rp_vltime;
 343 }
 344
 345 static int
 346 rr_are_ifid_equal(struct in6_addr *ii1, struct in6_addr *ii2, int ii_len)
 347 {
 348         int ii_bytelen, ii_bitlen;
 349         int p_bytelen, p_bitlen;
 350
 351         /* sanity check */
 352         if (1 > ii_len ||
 353             ii_len > 124) { /* as RFC2373, prefix is at least 4 bit */
 354                 log(LOG_ERR, "rr_are_ifid_equal: invalid ifid length(%d)\n",
 355                     ii_len);
 356                 return (0);
 357         }
 358
 359         ii_bytelen = ii_len / 8;
 360         ii_bitlen = ii_len % 8;
 361
 362         p_bytelen = sizeof(struct in6_addr) - ii_bytelen - 1;
 363         p_bitlen = 8 - ii_bitlen;
 364
 365         if (bcmp(ii1->s6_addr + p_bytelen + 1, ii2->s6_addr + p_bytelen + 1,
 366                  ii_bytelen))
 367                 return (0);
 368         if (((ii1->s6_addr[p_bytelen] << p_bitlen) & 0xff) !=
 369             ((ii2->s6_addr[p_bytelen] << p_bitlen) & 0xff))
 370                 return (0);
 371
 372         return (1);
 373 }
 374
 375 static struct rp_addr *
 376 search_ifidwithprefix(struct rr_prefix *rpp, struct in6_addr *ifid)
 377 {
 378         struct rp_addr *rap;
 379
 380         LIST_FOREACH(rap, &rpp->rp_addrhead, ra_entry)
 381         {
 382                 if (rr_are_ifid_equal(ifid, &rap->ra_ifid,
 383                                       (sizeof(struct in6_addr) << 3) -
 384                                       rpp->rp_plen))
 385                         break;
 386         }
 387         return rap;
 388 }
 389
 390 static int
 391 assign_ra_entry(struct rr_prefix *rpp, int iilen, struct in6_ifaddr *ia)
 392 {
 393         int error = 0;
 394         struct rp_addr *rap;
 395
 396         if ((error = create_ra_entry(&rap)) != 0)
 397                 return error;
 398
 399         /* copy interface id part */
 400         bit_copy((caddr_t)&rap->ra_ifid, sizeof(rap->ra_ifid) << 3,
 401                  (caddr_t)IA6_IN6(ia),
 402                  sizeof(*IA6_IN6(ia)) << 3, rpp->rp_plen, iilen);
 403         /* link to ia, and put into list */
 404         rap->ra_addr = ia;
 405         IFAREF(&rap->ra_addr->ia_ifa);
 406 #if 0 /* Can't do this now, because rpp may be on th stack. should fix it? */
 407         ia->ia6_ifpr = rp2ifpr(rpp);
 408 #endif
 409         crit_enter();
 410         LIST_INSERT_HEAD(&rpp->rp_addrhead, rap, ra_entry);
 411         crit_exit();
 412
 413         return 0;
 414 }
 415
 416 /*
 417  * add a link-local address to an interface.  we will add new interface address
 418  * (prefix database + new interface id).
 419  */
 420 static int
 421 in6_prefix_add_llifid(int iilen, struct in6_ifaddr *ia)
 422 {
 423         struct rr_prefix *rpp;
 424         struct rp_addr *rap;
 425         struct socket so;
 426         int error;
 427
 428         if ((error = create_ra_entry(&rap)) != 0)
 429                 return (error);
 430         /* copy interface id part */
 431         bit_copy((caddr_t)&rap->ra_ifid, sizeof(rap->ra_ifid) << 3,
 432                  (caddr_t)IA6_IN6(ia), sizeof(*IA6_IN6(ia)) << 3,
 433                  64, (sizeof(rap->ra_ifid) << 3) - 64);
 434         /* XXX: init dummy so */
 435         bzero(&so, sizeof(so));
 436         /* insert into list */
 437         LIST_FOREACH(rpp, &rr_prefix, rp_entry)
 438         {
 439                 /*
 440                  * do not attempt to add an address, if ifp does not match
 441                  */
 442                 if (rpp->rp_ifp != ia->ia_ifp)
 443                         continue;
 444
 445                 crit_enter();
 446                 LIST_INSERT_HEAD(&rpp->rp_addrhead, rap, ra_entry);
 447                 crit_exit();
 448                 add_each_addr(&so, rpp, rap);
 449         }
 450         return 0;
 451 }
 452
 453 /*
 454  * add an address to an interface.  if the interface id portion is new,
 455  * we will add new interface address (prefix database + new interface id).
 456  */
 457 int
 458 in6_prefix_add_ifid(int iilen, struct in6_ifaddr *ia)
 459 {
 460         int plen = (sizeof(*IA6_IN6(ia)) << 3) - iilen;
 461         struct ifprefix *ifpr;
 462         struct rp_addr *rap;
 463         int error = 0;
 464
 465         if (IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia)))
 466                 return (in6_prefix_add_llifid(iilen, ia));
 467         ifpr = in6_prefixwithifp(ia->ia_ifp, plen, IA6_IN6(ia));
 468         if (ifpr == NULL) {
 469                 struct rr_prefix rp;
 470                 struct socket so;
 471                 int pplen = (plen == 128) ? 64 : plen; /* XXX hardcoded 64 is bad */
 472
 473                 /* allocate a prefix for ia, with default properties */
 474
 475                 /* init rp */
 476                 bzero(&rp, sizeof(rp));
 477                 rp.rp_type = IN6_PREFIX_RR;
 478                 rp.rp_ifp = ia->ia_ifp;
 479                 rp.rp_plen = pplen;
 480                 rp.rp_prefix.sin6_len = sizeof(rp.rp_prefix);
 481                 rp.rp_prefix.sin6_family = AF_INET6;
 482                 bit_copy((char *)RP_IN6(&rp), sizeof(*RP_IN6(&rp)) << 3,
 483                          (char *)&ia->ia_addr.sin6_addr,
 484                          sizeof(ia->ia_addr.sin6_addr) << 3,
 485                          0, pplen);
 486                 rp.rp_vltime = rp.rp_pltime = RR_INFINITE_LIFETIME;
 487                 rp.rp_raf_onlink = 1;
 488                 rp.rp_raf_auto = 1;
 489                 /* Is some FlagMasks for rrf necessary? */
 490                 rp.rp_rrf_decrvalid = rp.rp_rrf_decrprefd = 0;
 491                 rp.rp_origin = PR_ORIG_RR; /* can be renumbered */
 492
 493                 /* create ra_entry */
 494                 error = link_stray_ia6s(&rp);
 495                 if (error != 0) {
 496                         free_rp_entries(&rp);
 497                         return error;
 498                 }
 499
 500                 /* XXX: init dummy so */
 501                 bzero(&so, sizeof(so));
 502
 503                 error = add_each_prefix(&so, &rp);
 504
 505                 /* free each rp_addr entry */
 506                 free_rp_entries(&rp);
 507
 508                 if (error != 0)
 509                         return error;
 510
 511                 /* search again */
 512                 ifpr = in6_prefixwithifp(ia->ia_ifp, pplen, IA6_IN6(ia));
 513                 if (ifpr == NULL)
 514                         return 0;
 515         }
 516         rap = search_ifidwithprefix(ifpr2rp(ifpr), IA6_IN6(ia));
 517         if (rap != NULL) {
 518                 if (rap->ra_addr == NULL) {
 519                         rap->ra_addr = ia;
 520                         IFAREF(&rap->ra_addr->ia_ifa);
 521                 } else if (rap->ra_addr != ia) {
 522                         /* There may be some inconsistencies between addrs. */
 523                         log(LOG_ERR, "ip6_prefix.c: addr %s/%d matched prefix"
 524                             " already has another ia %p(%s) on its ifid list\n",
 525                             ip6_sprintf(IA6_IN6(ia)), plen,
 526                             rap->ra_addr,
 527                             ip6_sprintf(IA6_IN6(rap->ra_addr)));
 528                         return EADDRINUSE /* XXX */;
 529                 }
 530                 ia->ia6_ifpr = ifpr;
 531                 return 0;
 532         }
 533         error = assign_ra_entry(ifpr2rp(ifpr), iilen, ia);
 534         if (error == 0)
 535                 ia->ia6_ifpr = ifpr;
 536         return (error);
 537 }
 538
 539 void
 540 in6_prefix_remove_ifid(int iilen, struct in6_ifaddr *ia)
 541 {
 542         struct rp_addr *rap;
 543
 544         if (ia->ia6_ifpr == NULL)
 545                 return;
 546         rap = search_ifidwithprefix(ifpr2rp(ia->ia6_ifpr), IA6_IN6(ia));
 547         if (rap != NULL) {
 548                 crit_enter();
 549                 LIST_REMOVE(rap, ra_entry);
 550                 crit_exit();
 551                 if (rap->ra_addr)
 552                         IFAFREE(&rap->ra_addr->ia_ifa);
 553                 kfree(rap, M_RR_ADDR);
 554         }
 555
 556         if (LIST_EMPTY(&ifpr2rp(ia->ia6_ifpr)->rp_addrhead))
 557                 rp_remove(ifpr2rp(ia->ia6_ifpr));
 558 }
 559
 560 void
 561 in6_purgeprefix(struct ifnet *ifp)
 562 {
 563         struct ifprefix *ifpr, *nextifpr;
 564
 565         /* delete prefixes before ifnet goes away */
 566         for (ifpr = TAILQ_FIRST(&ifp->if_prefixhead); ifpr;
 567              ifpr = nextifpr)
 568         {
 569                 nextifpr = TAILQ_NEXT(ifpr, ifpr_list);
 570                 if (ifpr->ifpr_prefix->sa_family != AF_INET6 ||
 571                     ifpr->ifpr_type != IN6_PREFIX_RR)
 572                         continue;
 573                 delete_each_prefix(ifpr2rp(ifpr), PR_ORIG_KERNEL);
 574         }
 575 }
 576
 577 static void
 578 add_each_addr(struct socket *so, struct rr_prefix *rpp, struct rp_addr *rap)
 579 {
 580         struct in6_ifaddr *ia6;
 581         struct in6_aliasreq ifra;
 582         int error;
 583
 584         /* init ifra */
 585         bzero(&ifra, sizeof(ifra));
 586         strncpy(ifra.ifra_name, if_name(rpp->rp_ifp), sizeof(ifra.ifra_name));
 587         ifra.ifra_addr.sin6_family = ifra.ifra_prefixmask.sin6_family =
 588                 AF_INET6;
 589         ifra.ifra_addr.sin6_len = ifra.ifra_prefixmask.sin6_len =
 590                 sizeof(ifra.ifra_addr);
 591         /* copy prefix part */
 592         bit_copy((char *)&ifra.ifra_addr.sin6_addr,
 593                  sizeof(ifra.ifra_addr.sin6_addr) << 3,
 594                  (char *)RP_IN6(rpp), sizeof(*RP_IN6(rpp)) << 3,
 595                  0, rpp->rp_plen);
 596         /* copy interface id part */
 597         bit_copy((char *)&ifra.ifra_addr.sin6_addr,
 598                  sizeof(ifra.ifra_addr.sin6_addr) << 3,
 599                  (char *)&rap->ra_ifid, sizeof(rap->ra_ifid) << 3,
 600                  rpp->rp_plen, (sizeof(rap->ra_ifid) << 3) - rpp->rp_plen);
 601         in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, rpp->rp_plen);
 602         /* don't care ifra_flags for now */
 603
 604         /*
 605          * XXX: if we did this with finite lifetime values, the lifetimes would
 606          *      decrese in time and never incremented.
 607          *      we should need more clarifications on the prefix mechanism...
 608          */
 609         ifra.ifra_lifetime.ia6t_vltime = rpp->rp_vltime;
 610         ifra.ifra_lifetime.ia6t_pltime = rpp->rp_pltime;
 611
 612         ia6 = in6ifa_ifpwithaddr(rpp->rp_ifp, &ifra.ifra_addr.sin6_addr);
 613         if (ia6 != NULL) {
 614                 if (ia6->ia6_ifpr == NULL) {
 615                         /* link this addr and the prefix each other */
 616                         if (rap->ra_addr)
 617                                 IFAFREE(&rap->ra_addr->ia_ifa);
 618                         rap->ra_addr = ia6;
 619                         IFAREF(&rap->ra_addr->ia_ifa);
 620                         ia6->ia6_ifpr = rp2ifpr(rpp);
 621                         return;
 622                 }
 623                 if (ia6->ia6_ifpr == rp2ifpr(rpp)) {
 624                         if (rap->ra_addr)
 625                                 IFAFREE(&rap->ra_addr->ia_ifa);
 626                         rap->ra_addr = ia6;
 627                         IFAREF(&rap->ra_addr->ia_ifa);
 628                         return;
 629                 }
 630                 /*
 631                  * The addr is already assigned to other
 632                  * prefix.
 633                  * There may be some inconsistencies between
 634                  * prefixes.
 635                  * e.g. overraped prefixes with common starting
 636                  *      part and different plefixlen.
 637                  *      Or, completely duplicated prefixes?
 638                  * log it and return.
 639                  */
 640                 log(LOG_ERR,
 641                     "in6_prefix.c: add_each_addr: addition of an addr %s/%d "
 642                     "failed because there is already another addr %s/%d\n",
 643                     ip6_sprintf(&ifra.ifra_addr.sin6_addr), rpp->rp_plen,
 644                     ip6_sprintf(IA6_IN6(ia6)),
 645                     in6_mask2len(&ia6->ia_prefixmask.sin6_addr, NULL));
 646                 return;
 647         }
 648         /* propagate ANYCAST flag if it is set for ancestor addr */
 649         if (rap->ra_flags.anycast != 0)
 650                 ifra.ifra_flags |= IN6_IFF_ANYCAST;
 651         error = in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, rpp->rp_ifp,
 652                             curthread);
 653         if (error != 0) {
 654                 log(LOG_ERR, "in6_prefix.c: add_each_addr: addition of an addr"
 655                     "%s/%d failed because in6_control failed for error %d\n",
 656                     ip6_sprintf(&ifra.ifra_addr.sin6_addr), rpp->rp_plen,
 657                     error);
 658                 return;
 659         }
 660
 661         /*
 662          * link beween this addr and the prefix will be done
 663          * in in6_prefix_add_ifid
 664          */
 665 }
 666
 667 static int
 668 rrpr_update(struct socket *so, struct rr_prefix *new)
 669 {
 670         struct rr_prefix *rpp;
 671         struct ifprefix *ifpr;
 672         struct rp_addr *rap;
 673
 674         /* search existing prefix */
 675         for (ifpr = TAILQ_FIRST(&new->rp_ifp->if_prefixhead); ifpr;
 676              ifpr = TAILQ_NEXT(ifpr, ifpr_list))
 677         {
 678                 if (ifpr->ifpr_prefix->sa_family != AF_INET6 ||
 679                     ifpr->ifpr_type != IN6_PREFIX_RR)
 680                         continue;
 681                 if (ifpr->ifpr_plen == new->rp_plen &&
 682                     in6_are_prefix_equal(IFPR_IN6(ifpr), RP_IN6(new),
 683                                          ifpr->ifpr_plen))
 684                         break;
 685         }
 686         rpp = ifpr2rp(ifpr);
 687         if (rpp != NULL) {
 688                 /*
 689                  * We got a prefix which we have seen in the past.
 690                  */
 691                 /*
 692                  * If the origin of the already-installed prefix is more
 693                  * preferable than the new one, ignore installation request.
 694                  */
 695                 if (rpp->rp_origin > new->rp_origin)
 696                         return (EPERM);
 697
 698                 /* update prefix information */
 699                 rpp->rp_flags.prf_ra = new->rp_flags.prf_ra;
 700                 if (rpp->rp_origin >= PR_ORIG_RR)
 701                         rpp->rp_flags.prf_rr = new->rp_flags.prf_rr;
 702                 rpp->rp_vltime = new->rp_vltime;
 703                 rpp->rp_pltime = new->rp_pltime;
 704                 rpp->rp_expire = new->rp_expire;
 705                 rpp->rp_preferred = new->rp_preferred;
 706                 rpp->rp_statef_delmark = 0; /* cancel deletion */
 707                 /*
 708                  * Interface id related update.
 709                  *  add rp_addr entries in new into rpp, if they have not
 710                  *  been already included in rpp.
 711                  */
 712                 while (!LIST_EMPTY(&new->rp_addrhead))
 713                 {
 714                         rap = LIST_FIRST(&new->rp_addrhead);
 715                         LIST_REMOVE(rap, ra_entry);
 716                         if (search_ifidwithprefix(rpp, &rap->ra_ifid)
 717                             != NULL) {
 718                                 if (rap->ra_addr)
 719                                         IFAFREE(&rap->ra_addr->ia_ifa);
 720                                 kfree(rap, M_RR_ADDR);
 721                                 continue;
 722                         }
 723                         crit_enter();
 724                         LIST_INSERT_HEAD(&rpp->rp_addrhead, rap, ra_entry);
 725                         crit_exit();
 726                 }
 727         } else {
 728                 /*
 729                  * We got a fresh prefix.
 730                  */
 731                 /* create new prefix */
 732                 rpp = (struct rr_prefix *)kmalloc(sizeof(*rpp), M_IP6RR,
 733                                                  M_NOWAIT);
 734                 if (rpp == NULL) {
 735                         log(LOG_ERR, "in6_prefix.c: rrpr_update:%d"
 736                             ": ENOBUFS for rr_prefix\n", __LINE__);
 737                         return (ENOBUFS);
 738                 }
 739                 /* initilization */
 740                 *rpp = *new;
 741                 LIST_INIT(&rpp->rp_addrhead);
 742                 /*  move rp_addr entries of new to rpp */
 743                 while (!LIST_EMPTY(&new->rp_addrhead))
 744                 {
 745                         rap = LIST_FIRST(&new->rp_addrhead);
 746                         LIST_REMOVE(rap, ra_entry);
 747                         LIST_INSERT_HEAD(&rpp->rp_addrhead, rap, ra_entry);
 748                 }
 749
 750                 /* let rp_ifpr.ifpr_prefix point rr_prefix. */
 751                 rpp->rp_ifpr.ifpr_prefix = (struct sockaddr *)&rpp->rp_prefix;
 752                 /* link rr_prefix entry to if_prefixlist */
 753                 {
 754                         struct ifnet *ifp = rpp->rp_ifp;
 755                         struct ifprefix *ifpr;
 756
 757                         if ((ifpr = TAILQ_FIRST(&ifp->if_prefixhead))
 758                             != NULL) {
 759                                 for ( ; TAILQ_NEXT(ifpr, ifpr_list);
 760                                       ifpr = TAILQ_NEXT(ifpr, ifpr_list))
 761                                         continue;
 762                                 TAILQ_NEXT(ifpr, ifpr_list) = rp2ifpr(rpp);
 763                         } else
 764                                 TAILQ_FIRST(&ifp->if_prefixhead) =
 765                                         rp2ifpr(rpp);
 766                         rp2ifpr(rpp)->ifpr_type = IN6_PREFIX_RR;
 767                 }
 768                 /* link rr_prefix entry to rr_prefix list */
 769                 crit_enter();
 770                 LIST_INSERT_HEAD(&rr_prefix, rpp, rp_entry);
 771                 crit_exit();
 772         }
 773
 774         if (!new->rp_raf_auto)
 775                 return 0;
 776
 777         /*
 778          * Add an address for each interface id, if it is not yet
 779          * If it existed but not pointing to the prefix yet,
 780          * init the prefix pointer.
 781          */
 782         LIST_FOREACH(rap, &rpp->rp_addrhead, ra_entry)
 783         {
 784                 if (rap->ra_addr != NULL) {
 785                         if (rap->ra_addr->ia6_ifpr == NULL)
 786                                 rap->ra_addr->ia6_ifpr = rp2ifpr(rpp);
 787                         continue;
 788                 }
 789                 add_each_addr(so, rpp, rap);
 790         }
 791         return 0;
 792 }
 793
 794 static int
 795 add_each_prefix(struct socket *so, struct rr_prefix *rpp)
 796 {
 797         init_prefix_ltimes(rpp);
 798         return (rrpr_update(so, rpp));
 799 }
 800
 801 static void
 802 rp_remove(struct rr_prefix *rpp)
 803 {
 804         crit_enter();
 805         /* unlink rp_entry from if_prefixlist */
 806         {
 807                 struct ifnet *ifp = rpp->rp_ifp;
 808                 struct ifprefix *ifpr;
 809
 810                 if ((ifpr = TAILQ_FIRST(&ifp->if_prefixhead)) == rp2ifpr(rpp))
 811                         TAILQ_FIRST(&ifp->if_prefixhead) =
 812                                 TAILQ_NEXT(ifpr, ifpr_list);
 813                 else {
 814                         while (TAILQ_NEXT(ifpr, ifpr_list) != NULL &&
 815                                (TAILQ_NEXT(ifpr, ifpr_list) != rp2ifpr(rpp)))
 816                                 ifpr = TAILQ_NEXT(ifpr, ifpr_list);
 817                         if (TAILQ_NEXT(ifpr, ifpr_list))
 818                                 TAILQ_NEXT(ifpr, ifpr_list) =
 819                                         TAILQ_NEXT(rp2ifpr(rpp), ifpr_list);
 820                         else
 821                                 kprintf("Couldn't unlink rr_prefix from ifp\n");
 822                 }
 823         }
 824         /* unlink rp_entry from rr_prefix list */
 825         LIST_REMOVE(rpp, rp_entry);
 826         crit_exit();
 827         kfree(rpp, M_IP6RR);
 828 }
 829
 830 static int
 831 create_ra_entry(struct rp_addr **rapp)
 832 {
 833         *rapp = (struct rp_addr *)kmalloc(sizeof(struct rp_addr), M_RR_ADDR,
 834                                          M_NOWAIT | M_ZERO);
 835         if (*rapp == NULL) {
 836                 log(LOG_ERR, "in6_prefix.c: init_newprefix:%d: ENOBUFS"
 837                     "for rp_addr\n", __LINE__);
 838                 return ENOBUFS;
 839         }
 840
 841         return 0;
 842 }
 843
 844 static int
 845 init_newprefix(struct in6_rrenumreq *irr, struct ifprefix *ifpr,
 846                struct rr_prefix *rpp)
 847 {
 848         struct rp_addr *orap;
 849
 850         /* init rp */
 851         bzero(rpp, sizeof(*rpp));
 852         rpp->rp_type = IN6_PREFIX_RR;
 853         rpp->rp_ifp = ifpr->ifpr_ifp;
 854         rpp->rp_plen = ifpr->ifpr_plen;
 855         rpp->rp_prefix.sin6_len = sizeof(rpp->rp_prefix);
 856         rpp->rp_prefix.sin6_family = AF_INET6;
 857         bit_copy((char *)RP_IN6(rpp), sizeof(*RP_IN6(rpp)) << 3,
 858                  (char *)&irr->irr_useprefix.sin6_addr,
 859                  sizeof(irr->irr_useprefix.sin6_addr) << 3,
 860                  0, irr->irr_u_uselen);
 861         /* copy keeplen part if necessary as necessary len */
 862         if (irr->irr_u_uselen < ifpr->ifpr_plen)
 863                 bit_copy((char *)RP_IN6(rpp), sizeof(*RP_IN6(rpp)) << 3,
 864                          (char *)IFPR_IN6(ifpr), sizeof(*IFPR_IN6(ifpr)) << 3,
 865                          irr->irr_u_uselen,
 866                          min(ifpr->ifpr_plen - irr->irr_u_uselen,
 867                              irr->irr_u_keeplen));
 868         LIST_FOREACH(orap, &(ifpr2rp(ifpr)->rp_addrhead), ra_entry)
 869         {
 870                 struct rp_addr *rap;
 871                 int error = 0;
 872
 873                 if ((error = create_ra_entry(&rap)) != 0)
 874                         return error;
 875                 rap->ra_ifid = orap->ra_ifid;
 876                 rap->ra_flags.anycast = (orap->ra_addr != NULL &&
 877                                          (orap->ra_addr->ia6_flags &
 878                                           IN6_IFF_ANYCAST) != 0) ? 1 : 0;
 879                 LIST_INSERT_HEAD(&rpp->rp_addrhead, rap, ra_entry);
 880         }
 881         rpp->rp_vltime = irr->irr_vltime;
 882         rpp->rp_pltime = irr->irr_pltime;
 883         rpp->rp_raf_onlink = irr->irr_raf_mask_onlink ? irr->irr_raf_onlink :
 884                 ifpr2rp(ifpr)->rp_raf_onlink;
 885         rpp->rp_raf_auto = irr->irr_raf_mask_auto ? irr->irr_raf_auto :
 886                 ifpr2rp(ifpr)->rp_raf_auto;
 887         /* Is some FlagMasks for rrf necessary? */
 888         rpp->rp_rrf = irr->irr_rrf;
 889         rpp->rp_origin = irr->irr_origin;
 890
 891         return 0;
 892 }
 893
 894 static void
 895 free_rp_entries(struct rr_prefix *rpp)
 896 {
 897         /*
 898          * This func is only called with rpp on stack(not on list).
 899          * So no crit_enter() here
 900          */
 901         while (!LIST_EMPTY(&rpp->rp_addrhead))
 902         {
 903                 struct rp_addr *rap;
 904
 905                 rap = LIST_FIRST(&rpp->rp_addrhead);
 906                 LIST_REMOVE(rap, ra_entry);
 907                 if (rap->ra_addr)
 908                         IFAFREE(&rap->ra_addr->ia_ifa);
 909                 kfree(rap, M_RR_ADDR);
 910         }
 911 }
 912
 913 static int
 914 add_useprefixes(struct socket *so, struct ifnet *ifp,
 915                 struct in6_rrenumreq *irr)
 916 {
 917         struct ifprefix *ifpr, *nextifpr;
 918         struct rr_prefix rp;
 919         int error = 0;
 920
 921         /* add prefixes to each of marked prefix */
 922         for (ifpr = TAILQ_FIRST(&ifp->if_prefixhead); ifpr; ifpr = nextifpr)
 923         {
 924                 nextifpr = TAILQ_NEXT(ifpr, ifpr_list);
 925                 if (ifpr->ifpr_prefix->sa_family != AF_INET6 ||
 926                     ifpr->ifpr_type != IN6_PREFIX_RR)
 927                         continue;
 928                 if (ifpr2rp(ifpr)->rp_statef_addmark) {
 929                         if ((error = init_newprefix(irr, ifpr, &rp)) != 0)
 930                                 break;
 931                         error = add_each_prefix(so, &rp);
 932                 }
 933         }
 934         /* free each rp_addr entry */
 935         free_rp_entries(&rp);
 936
 937         return error;
 938 }
 939
 940 static void
 941 unprefer_prefix(struct rr_prefix *rpp)
 942 {
 943         struct rp_addr *rap;
 944
 945         for (rap = rpp->rp_addrhead.lh_first; rap != NULL;
 946              rap = rap->ra_entry.le_next) {
 947                 if (rap->ra_addr == NULL)
 948                         continue;
 949                 rap->ra_addr->ia6_lifetime.ia6t_preferred = time_second;
 950                 rap->ra_addr->ia6_lifetime.ia6t_pltime = 0;
 951         }
 952 }
 953
 954 int
 955 delete_each_prefix(struct rr_prefix *rpp, u_char origin)
 956 {
 957         int error = 0;
 958
 959         if (rpp->rp_origin > origin)
 960                 return (EPERM);
 961
 962         while (rpp->rp_addrhead.lh_first != NULL) {
 963                 struct rp_addr *rap;
 964
 965                 crit_enter();
 966                 rap = LIST_FIRST(&rpp->rp_addrhead);
 967                 if (rap == NULL) {
 968                         crit_exit();
 969                         break;
 970                 }
 971                 LIST_REMOVE(rap, ra_entry);
 972                 crit_exit();
 973                 if (rap->ra_addr == NULL) {
 974                         kfree(rap, M_RR_ADDR);
 975                         continue;
 976                 }
 977                 rap->ra_addr->ia6_ifpr = NULL;
 978
 979                 in6_purgeaddr(&rap->ra_addr->ia_ifa);
 980                 IFAFREE(&rap->ra_addr->ia_ifa);
 981                 kfree(rap, M_RR_ADDR);
 982         }
 983         rp_remove(rpp);
 984
 985         return error;
 986 }
 987
 988 static void
 989 delete_prefixes(struct ifnet *ifp, u_char origin)
 990 {
 991         struct ifprefix *ifpr, *nextifpr;
 992
 993         /* delete prefixes marked as tobe deleted */
 994         for (ifpr = TAILQ_FIRST(&ifp->if_prefixhead); ifpr; ifpr = nextifpr)
 995         {
 996                 nextifpr = TAILQ_NEXT(ifpr, ifpr_list);
 997                 if (ifpr->ifpr_prefix->sa_family != AF_INET6 ||
 998                     ifpr->ifpr_type != IN6_PREFIX_RR)
 999                         continue;
1000                 if (ifpr2rp(ifpr)->rp_statef_delmark)
1001                         delete_each_prefix(ifpr2rp(ifpr), origin);
1002         }
1003 }
1004
1005 static int
1006 link_stray_ia6s(struct rr_prefix *rpp)
1007 {
1008         struct ifaddr *ifa;
1009
1010         TAILQ_FOREACH(ifa, &rpp->rp_ifp->if_addrlist, ifa_list) {
1011                 struct rp_addr *rap;
1012                 struct rr_prefix *orpp;
1013                 int error = 0;
1014
1015                 if (ifa->ifa_addr->sa_family != AF_INET6)
1016                         continue;
1017                 if (rpp->rp_plen > in6_matchlen(RP_IN6(rpp), IFA_IN6(ifa)))
1018                         continue;
1019
1020                 orpp = ifpr2rp(((struct in6_ifaddr *)ifa)->ia6_ifpr);
1021                 if (orpp != NULL) {
1022                         if (!in6_are_prefix_equal(RP_IN6(orpp), RP_IN6(rpp),
1023                                                   rpp->rp_plen))
1024                                 log(LOG_ERR, "in6_prefix.c: link_stray_ia6s:"
1025                                     "addr %s/%d already linked to a prefix"
1026                                     "and it matches also %s/%d\n",
1027                                     ip6_sprintf(IFA_IN6(ifa)), orpp->rp_plen,
1028                                     ip6_sprintf(RP_IN6(rpp)),
1029                                     rpp->rp_plen);
1030                         continue;
1031                 }
1032                 if ((error = assign_ra_entry(rpp,
1033                                               (sizeof(rap->ra_ifid) << 3) -
1034                                               rpp->rp_plen,
1035                                               (struct in6_ifaddr *)ifa)) != 0)
1036                         return error;
1037         }
1038         return 0;
1039 }
1040
1041 /* XXX assumes that permission is already checked by the caller */
1042 int
1043 in6_prefix_ioctl(struct socket *so, u_long cmd, caddr_t data,
1044                  struct ifnet *ifp)
1045 {
1046         struct rr_prefix *rpp, rp_tmp;
1047         struct rp_addr *rap;
1048         struct in6_prefixreq *ipr = (struct in6_prefixreq *)data;
1049         struct in6_rrenumreq *irr = (struct in6_rrenumreq *)data;
1050         struct ifaddr *ifa;
1051         int error = 0;
1052
1053         /*
1054          * Failsafe for errneous address config program.
1055          * Let's hope rrenumd don't make a mistakes.
1056          */
1057         if (ipr->ipr_origin <= PR_ORIG_RA)
1058                 ipr->ipr_origin = PR_ORIG_STATIC;
1059
1060         switch (cmd) {
1061         case SIOCSGIFPREFIX_IN6:
1062                 delmark_global_prefixes(ifp, irr);
1063                 /* FALL THROUGH */
1064         case SIOCAIFPREFIX_IN6:
1065         case SIOCCIFPREFIX_IN6:
1066                 /* check if preferred lifetime > valid lifetime */
1067                 if (irr->irr_pltime > irr->irr_vltime) {
1068                         log(LOG_NOTICE,
1069                             "in6_prefix_ioctl: preferred lifetime"
1070                             "(%ld) is greater than valid lifetime(%ld)\n",
1071                             (u_long)irr->irr_pltime, (u_long)irr->irr_vltime);
1072                         error = EINVAL;
1073                         break;
1074                 }
1075                 if (mark_matched_prefixes(cmd, ifp, irr)) {
1076                         if (irr->irr_u_uselen != 0)
1077                                 if ((error = add_useprefixes(so, ifp, irr))
1078                                     != 0)
1079                                         goto failed;
1080                         if (cmd != SIOCAIFPREFIX_IN6)
1081                                 delete_prefixes(ifp, irr->irr_origin);
1082                 } else
1083                         return (EADDRNOTAVAIL);
1084         failed:
1085                 unmark_prefixes(ifp);
1086                 break;
1087         case SIOCGIFPREFIX_IN6:
1088                 rpp = search_matched_prefix(ifp, ipr);
1089                 if (rpp == NULL || ifp != rpp->rp_ifp)
1090                         return (EADDRNOTAVAIL);
1091
1092                 ipr->ipr_origin = rpp->rp_origin;
1093                 ipr->ipr_plen = rpp->rp_plen;
1094                 ipr->ipr_vltime = rpp->rp_vltime;
1095                 ipr->ipr_pltime = rpp->rp_pltime;
1096                 ipr->ipr_flags = rpp->rp_flags;
1097                 ipr->ipr_prefix = rpp->rp_prefix;
1098
1099                 break;
1100         case SIOCSIFPREFIX_IN6:
1101                 /* check if preferred lifetime > valid lifetime */
1102                 if (ipr->ipr_pltime > ipr->ipr_vltime) {
1103                         log(LOG_NOTICE,
1104                             "in6_prefix_ioctl: preferred lifetime"
1105                             "(%ld) is greater than valid lifetime(%ld)\n",
1106                             (u_long)ipr->ipr_pltime, (u_long)ipr->ipr_vltime);
1107                         error = EINVAL;
1108                         break;
1109                 }
1110
1111                 /* init rp_tmp */
1112                 bzero((caddr_t)&rp_tmp, sizeof(rp_tmp));
1113                 rp_tmp.rp_ifp = ifp;
1114                 rp_tmp.rp_plen = ipr->ipr_plen;
1115                 rp_tmp.rp_prefix = ipr->ipr_prefix;
1116                 rp_tmp.rp_vltime = ipr->ipr_vltime;
1117                 rp_tmp.rp_pltime = ipr->ipr_pltime;
1118                 rp_tmp.rp_flags = ipr->ipr_flags;
1119                 rp_tmp.rp_origin = ipr->ipr_origin;
1120
1121                 /* create rp_addr entries, usually at least for lladdr */
1122                 if ((error = link_stray_ia6s(&rp_tmp)) != 0) {
1123                         free_rp_entries(&rp_tmp);
1124                         break;
1125                 }
1126                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_list) {
1127                         if (ifa->ifa_addr == NULL)
1128                                 continue;       /* just for safety */
1129                         if (ifa->ifa_addr->sa_family != AF_INET6)
1130                                 continue;
1131                         if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa)) == 0)
1132                                 continue;
1133
1134                         if ((error = create_ra_entry(&rap)) != 0) {
1135                                 free_rp_entries(&rp_tmp);
1136                                 goto bad;
1137                         }
1138                         /* copy interface id part */
1139                         bit_copy((caddr_t)&rap->ra_ifid,
1140                                  sizeof(rap->ra_ifid) << 3,
1141                                  (caddr_t)IFA_IN6(ifa),
1142                                  sizeof(*IFA_IN6(ifa)) << 3,
1143                                  rp_tmp.rp_plen,
1144                                  (sizeof(rap->ra_ifid) << 3) - rp_tmp.rp_plen);
1145                         /* insert into list */
1146                         LIST_INSERT_HEAD(&rp_tmp.rp_addrhead, rap, ra_entry);
1147                 }
1148
1149                 error = add_each_prefix(so, &rp_tmp);
1150
1151                 /* free each rp_addr entry */
1152                 free_rp_entries(&rp_tmp);
1153
1154                 break;
1155         case SIOCDIFPREFIX_IN6:
1156                 rpp = search_matched_prefix(ifp, ipr);
1157                 if (rpp == NULL || ifp != rpp->rp_ifp)
1158                         return (EADDRNOTAVAIL);
1159
1160                 error = delete_each_prefix(rpp, ipr->ipr_origin);
1161                 break;
1162         }
1163 bad:
1164         return error;
1165 }
1166
1167 void
1168 in6_rr_timer(void *ignored_arg)
1169 {
1170         struct rr_prefix *rpp;
1171
1172         callout_reset(&in6_rr_timer_ch, ip6_rr_prune * hz,
1173             in6_rr_timer, NULL);
1174
1175         crit_enter();
1176         /* expire */
1177         rpp = LIST_FIRST(&rr_prefix);
1178         while (rpp) {
1179                 if (rpp->rp_expire && rpp->rp_expire < time_second) {
1180                         struct rr_prefix *next_rpp;
1181
1182                         next_rpp = LIST_NEXT(rpp, rp_entry);
1183                         delete_each_prefix(rpp, PR_ORIG_KERNEL);
1184                         rpp = next_rpp;
1185                         continue;
1186                 }
1187                 if (rpp->rp_preferred && rpp->rp_preferred < time_second)
1188                         unprefer_prefix(rpp);
1189                 rpp = LIST_NEXT(rpp, rp_entry);
1190         }
1191         crit_exit();
1192 }