The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/netinet6/nd6_rtr.c

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    1 /*      $FreeBSD: src/sys/netinet6/nd6_rtr.c,v 1.2.2.5 2003/04/05 10:28:53 ume Exp $    */
    2 /*      $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $       */
    3 
    4 /*
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 #include "opt_inet.h"
   34 #include "opt_inet6.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/malloc.h>
   39 #include <sys/mbuf.h>
   40 #include <sys/socket.h>
   41 #include <sys/sockio.h>
   42 #include <sys/time.h>
   43 #include <sys/kernel.h>
   44 #include <sys/errno.h>
   45 #include <sys/syslog.h>
   46 #include <sys/queue.h>
   47 #include <sys/globaldata.h>
   48 #include <sys/mutex.h>
   49 
   50 #include <sys/thread2.h>
   51 #include <sys/mutex2.h>
   52 
   53 #include <net/if.h>
   54 #include <net/if_types.h>
   55 #include <net/if_dl.h>
   56 #include <net/route.h>
   57 #include <net/radix.h>
   58 
   59 #include <netinet/in.h>
   60 #include <netinet6/in6_var.h>
   61 #include <netinet6/in6_ifattach.h>
   62 #include <netinet/ip6.h>
   63 #include <netinet6/ip6_var.h>
   64 #include <netinet6/nd6.h>
   65 #include <netinet/icmp6.h>
   66 #include <netinet6/scope6_var.h>
   67 
   68 #include <net/net_osdep.h>
   69 
   70 #define SDL(s)  ((struct sockaddr_dl *)s)
   71 
   72 static struct nd_defrouter *defrtrlist_update (struct nd_defrouter *);
   73 static struct in6_ifaddr *in6_ifadd (struct nd_prefix *,
   74         struct in6_addr *);
   75 static struct nd_pfxrouter *pfxrtr_lookup (struct nd_prefix *,
   76         struct nd_defrouter *);
   77 static void pfxrtr_add (struct nd_prefix *, struct nd_defrouter *);
   78 static void pfxrtr_del (struct nd_pfxrouter *);
   79 static struct nd_pfxrouter *find_pfxlist_reachable_router
   80         (struct nd_prefix *);
   81 static void defrouter_addifreq (struct ifnet *);
   82 
   83 static void in6_init_address_ltimes (struct nd_prefix *ndpr,
   84                                          struct in6_addrlifetime *lt6);
   85 
   86 static int rt6_deleteroute (struct radix_node *, void *);
   87 
   88 extern int nd6_recalc_reachtm_interval;
   89 
   90 static struct ifnet *nd6_defifp;
   91 int nd6_defifindex;
   92 
   93 int ip6_use_tempaddr = 0;
   94 
   95 int ip6_desync_factor;
   96 u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME;
   97 u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME;
   98 /*
   99  * shorter lifetimes for debugging purposes.
  100 int ip6_temp_preferred_lifetime = 800;
  101 static int ip6_temp_valid_lifetime = 1800;
  102 */
  103 int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE;
  104 
  105 /*
  106  * Receive Router Solicitation Message - just for routers.
  107  * Router solicitation/advertisement is mostly managed by userland program
  108  * (rtadvd) so here we have no function like nd6_ra_output().
  109  *
  110  * Based on RFC 2461
  111  */
  112 void
  113 nd6_rs_input(struct mbuf *m, int off, int icmp6len)
  114 {
  115         struct ifnet *ifp = m->m_pkthdr.rcvif;
  116         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  117         struct nd_router_solicit *nd_rs;
  118         struct in6_addr saddr6 = ip6->ip6_src;
  119 #if 0
  120         struct in6_addr daddr6 = ip6->ip6_dst;
  121 #endif
  122         char *lladdr = NULL;
  123         int lladdrlen = 0;
  124 #if 0
  125         struct sockaddr_dl *sdl = NULL;
  126         struct llinfo_nd6 *ln = NULL;
  127         struct rtentry *rt = NULL;
  128         int is_newentry;
  129 #endif
  130         union nd_opts ndopts;
  131 
  132         /* If I'm not a router, ignore it. */
  133         if (ip6_accept_rtadv != 0 || ip6_forwarding != 1)
  134                 goto freeit;
  135 
  136         /* Sanity checks */
  137         if (ip6->ip6_hlim != 255) {
  138                 nd6log((LOG_ERR,
  139                     "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
  140                     ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
  141                     ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
  142                 goto bad;
  143         }
  144 
  145         /*
  146          * Don't update the neighbor cache, if src = ::.
  147          * This indicates that the src has no IP address assigned yet.
  148          */
  149         if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
  150                 goto freeit;
  151 
  152 #ifndef PULLDOWN_TEST
  153         IP6_EXTHDR_CHECK(m, off, icmp6len,);
  154         nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
  155 #else
  156         IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
  157         if (nd_rs == NULL) {
  158                 icmp6stat.icp6s_tooshort++;
  159                 return;
  160         }
  161 #endif
  162 
  163         icmp6len -= sizeof(*nd_rs);
  164         nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
  165         if (nd6_options(&ndopts) < 0) {
  166                 nd6log((LOG_INFO,
  167                     "nd6_rs_input: invalid ND option, ignored\n"));
  168                 /* nd6_options have incremented stats */
  169                 goto freeit;
  170         }
  171 
  172         if (ndopts.nd_opts_src_lladdr) {
  173                 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
  174                 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
  175         }
  176 
  177         if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
  178                 nd6log((LOG_INFO,
  179                     "nd6_rs_input: lladdrlen mismatch for %s "
  180                     "(if %d, RS packet %d)\n",
  181                         ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
  182                 goto bad;
  183         }
  184 
  185         nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
  186 
  187 freeit:
  188         m_freem(m);
  189         return;
  190 
  191 bad:
  192         icmp6stat.icp6s_badrs++;
  193         m_freem(m);
  194 }
  195 
  196 /*
  197  * Receive Router Advertisement Message.
  198  *
  199  * Based on RFC 2461
  200  * TODO: on-link bit on prefix information
  201  * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
  202  */
  203 void
  204 nd6_ra_input(struct mbuf *m, int off, int icmp6len)
  205 {
  206         struct ifnet *ifp = m->m_pkthdr.rcvif;
  207         struct nd_ifinfo *ndi = ND_IFINFO(ifp);
  208         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  209         struct nd_router_advert *nd_ra;
  210         struct in6_addr saddr6 = ip6->ip6_src;
  211 #if 0
  212         struct in6_addr daddr6 = ip6->ip6_dst;
  213         int flags; /* = nd_ra->nd_ra_flags_reserved; */
  214         int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0);
  215         int is_other = ((flags & ND_RA_FLAG_OTHER) != 0);
  216 #endif
  217         union nd_opts ndopts;
  218         struct nd_defrouter *dr;
  219 
  220         /*
  221          * We only accept RAs only when
  222          * the system-wide variable allows the acceptance, and
  223          * per-interface variable allows RAs on the receiving interface.
  224          */
  225         if (ip6_accept_rtadv == 0)
  226                 goto freeit;
  227         if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
  228                 goto freeit;
  229 
  230         if (ip6->ip6_hlim != 255) {
  231                 nd6log((LOG_ERR,
  232                     "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
  233                     ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
  234                     ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
  235                 goto bad;
  236         }
  237 
  238         if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
  239                 nd6log((LOG_ERR,
  240                     "nd6_ra_input: src %s is not link-local\n",
  241                     ip6_sprintf(&saddr6)));
  242                 goto bad;
  243         }
  244 
  245 #ifndef PULLDOWN_TEST
  246         IP6_EXTHDR_CHECK(m, off, icmp6len,);
  247         nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
  248 #else
  249         IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
  250         if (nd_ra == NULL) {
  251                 icmp6stat.icp6s_tooshort++;
  252                 return;
  253         }
  254 #endif
  255 
  256         icmp6len -= sizeof(*nd_ra);
  257         nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
  258         if (nd6_options(&ndopts) < 0) {
  259                 nd6log((LOG_INFO,
  260                     "nd6_ra_input: invalid ND option, ignored\n"));
  261                 /* nd6_options have incremented stats */
  262                 goto freeit;
  263         }
  264 
  265     {
  266         struct nd_defrouter dr0;
  267         u_int32_t advreachable = nd_ra->nd_ra_reachable;
  268 
  269         dr0.rtaddr = saddr6;
  270         dr0.flags  = nd_ra->nd_ra_flags_reserved;
  271         dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
  272         dr0.expire = time_uptime + dr0.rtlifetime;
  273         dr0.ifp = ifp;
  274         dr0.advint = 0;         /* Mobile IPv6 */
  275         dr0.advint_expire = 0;  /* Mobile IPv6 */
  276         dr0.advints_lost = 0;   /* Mobile IPv6 */
  277         /* unspecified or not? (RFC 2461 6.3.4) */
  278         if (advreachable) {
  279                 advreachable = ntohl(advreachable);
  280                 if (advreachable <= MAX_REACHABLE_TIME &&
  281                     ndi->basereachable != advreachable) {
  282                         ndi->basereachable = advreachable;
  283                         ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
  284                         ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */
  285                 }
  286         }
  287         if (nd_ra->nd_ra_retransmit)
  288                 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
  289         if (nd_ra->nd_ra_curhoplimit)
  290                 ndi->chlim = nd_ra->nd_ra_curhoplimit;
  291         dr = defrtrlist_update(&dr0);
  292     }
  293 
  294         /*
  295          * prefix
  296          */
  297         if (ndopts.nd_opts_pi) {
  298                 struct nd_opt_hdr *pt;
  299                 struct nd_opt_prefix_info *pi = NULL;
  300                 struct nd_prefix pr;
  301 
  302                 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
  303                      pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
  304                      pt = (struct nd_opt_hdr *)((caddr_t)pt +
  305                                                 (pt->nd_opt_len << 3))) {
  306                         if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
  307                                 continue;
  308                         pi = (struct nd_opt_prefix_info *)pt;
  309 
  310                         if (pi->nd_opt_pi_len != 4) {
  311                                 nd6log((LOG_INFO,
  312                                     "nd6_ra_input: invalid option "
  313                                     "len %d for prefix information option, "
  314                                     "ignored\n", pi->nd_opt_pi_len));
  315                                 continue;
  316                         }
  317 
  318                         if (128 < pi->nd_opt_pi_prefix_len) {
  319                                 nd6log((LOG_INFO,
  320                                     "nd6_ra_input: invalid prefix "
  321                                     "len %d for prefix information option, "
  322                                     "ignored\n", pi->nd_opt_pi_prefix_len));
  323                                 continue;
  324                         }
  325 
  326                         if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
  327                          || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
  328                                 nd6log((LOG_INFO,
  329                                     "nd6_ra_input: invalid prefix "
  330                                     "%s, ignored\n",
  331                                     ip6_sprintf(&pi->nd_opt_pi_prefix)));
  332                                 continue;
  333                         }
  334 
  335                         /* aggregatable unicast address, rfc2374 */
  336                         if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20
  337                          && pi->nd_opt_pi_prefix_len != 64) {
  338                                 nd6log((LOG_INFO,
  339                                     "nd6_ra_input: invalid prefixlen "
  340                                     "%d for rfc2374 prefix %s, ignored\n",
  341                                     pi->nd_opt_pi_prefix_len,
  342                                     ip6_sprintf(&pi->nd_opt_pi_prefix)));
  343                                 continue;
  344                         }
  345 
  346                         bzero(&pr, sizeof(pr));
  347                         pr.ndpr_prefix.sin6_family = AF_INET6;
  348                         pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
  349                         pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
  350                         pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
  351 
  352                         pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
  353                                               ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
  354                         pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
  355                                             ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
  356                         pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
  357                         pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
  358                         pr.ndpr_pltime =
  359                                 ntohl(pi->nd_opt_pi_preferred_time);
  360 
  361                         if (in6_init_prefix_ltimes(&pr))
  362                                 continue; /* prefix lifetime init failed */
  363 
  364                         prelist_update(&pr, dr, m);
  365                 }
  366         }
  367 
  368         /*
  369          * MTU
  370          */
  371         if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
  372                 u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
  373 
  374                 /* lower bound */
  375                 if (mtu < IPV6_MMTU) {
  376                         nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
  377                             "mtu=%d sent from %s, ignoring\n",
  378                             mtu, ip6_sprintf(&ip6->ip6_src)));
  379                         goto skip;
  380                 }
  381 
  382                 /* upper bound */
  383                 if (ndi->maxmtu) {
  384                         if (mtu <= ndi->maxmtu) {
  385                                 int change = (ndi->linkmtu != mtu);
  386 
  387                                 ndi->linkmtu = mtu;
  388                                 if (change) /* in6_maxmtu may change */
  389                                         in6_setmaxmtu();
  390                         } else {
  391                                 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
  392                                     "mtu=%d sent from %s; "
  393                                     "exceeds maxmtu %d, ignoring\n",
  394                                     mtu, ip6_sprintf(&ip6->ip6_src),
  395                                     ndi->maxmtu));
  396                         }
  397                 } else {
  398                         nd6log((LOG_INFO, "nd6_ra_input: mtu option "
  399                             "mtu=%d sent from %s; maxmtu unknown, "
  400                             "ignoring\n",
  401                             mtu, ip6_sprintf(&ip6->ip6_src)));
  402                 }
  403         }
  404 
  405 skip:
  406 
  407         /*
  408          * Source link layer address
  409          */
  410     {
  411         char *lladdr = NULL;
  412         int lladdrlen = 0;
  413 
  414         if (ndopts.nd_opts_src_lladdr) {
  415                 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
  416                 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
  417         }
  418 
  419         if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
  420                 nd6log((LOG_INFO,
  421                     "nd6_ra_input: lladdrlen mismatch for %s "
  422                     "(if %d, RA packet %d)\n",
  423                         ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
  424                 goto bad;
  425         }
  426 
  427         nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0);
  428 
  429         /*
  430          * Installing a link-layer address might change the state of the
  431          * router's neighbor cache, which might also affect our on-link
  432          * detection of adveritsed prefixes.
  433          */
  434         pfxlist_onlink_check();
  435     }
  436 
  437 freeit:
  438         m_freem(m);
  439         return;
  440 
  441 bad:
  442         icmp6stat.icp6s_badra++;
  443         m_freem(m);
  444 }
  445 
  446 /*
  447  * default router list proccessing sub routines
  448  */
  449 
  450 #if 0
  451 /* tell the change to user processes watching the routing socket. */
  452 static void
  453 nd6_rtmsg(int cmd, struct rtentry *rt)
  454 {
  455         struct rt_addrinfo info;
  456 
  457         bzero((caddr_t)&info, sizeof(info));
  458         info.rti_info[RTAX_DST] = rt_key(rt);
  459         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
  460         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
  461         if (TAILQ_EMPTY(&rt->rt_ifp->if_addrheads[mycpuid])) {
  462                 info.rti_info[RTAX_IFP] = NULL;
  463         } else {
  464                 info.rti_info[RTAX_IFP] =
  465                 (struct sockaddr *)
  466                 TAILQ_FIRST(&rt->rt_ifp->if_addrheads[mycpuid])->ifa;
  467         }
  468         info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
  469 
  470         rt_missmsg(cmd, &info, rt->rt_flags, 0);
  471 }
  472 #endif
  473 
  474 void
  475 defrouter_addreq(struct nd_defrouter *new)
  476 {
  477         struct sockaddr_in6 def, mask, gate;
  478 
  479         bzero(&def, sizeof(def));
  480         bzero(&mask, sizeof(mask));
  481         bzero(&gate, sizeof(gate));
  482 
  483         def.sin6_len = mask.sin6_len = gate.sin6_len
  484                 = sizeof(struct sockaddr_in6);
  485         def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
  486         gate.sin6_addr = new->rtaddr;
  487 
  488         rtrequest_global(RTM_ADD, (struct sockaddr *)&def,
  489                          (struct sockaddr *)&gate, (struct sockaddr *)&mask,
  490                          RTF_GATEWAY);
  491         return;
  492 }
  493 
  494 /* Add a route to a given interface as default */
  495 void
  496 defrouter_addifreq(struct ifnet *ifp)
  497 {
  498         struct sockaddr_in6 def, mask;
  499         struct ifaddr *ifa;
  500         int error, flags;
  501 
  502         bzero(&def, sizeof(def));
  503         bzero(&mask, sizeof(mask));
  504 
  505         def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6);
  506         def.sin6_family = mask.sin6_family = AF_INET6;
  507 
  508         /*
  509          * Search for an ifaddr beloging to the specified interface.
  510          * XXX: An IPv6 address are required to be assigned on the interface.
  511          */
  512         if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) {
  513                 nd6log((LOG_ERR,        /* better error? */
  514                     "defrouter_addifreq: failed to find an ifaddr "
  515                     "to install a route to interface %s\n",
  516                     if_name(ifp)));
  517                 return;
  518         }
  519 
  520         flags = ifa->ifa_flags;
  521         error = rtrequest_global(RTM_ADD,
  522                                  (struct sockaddr *)&def,
  523                                  ifa->ifa_addr,
  524                                  (struct sockaddr *)&mask,
  525                                  flags);
  526         if (error != 0) {
  527                 nd6log((LOG_ERR,
  528                     "defrouter_addifreq: failed to install a route to "
  529                     "interface %s (errno = %d)\n",
  530                     if_name(ifp), error));
  531         }
  532 }
  533 
  534 struct nd_defrouter *
  535 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
  536 {
  537         struct nd_defrouter *dr;
  538 
  539         for (dr = TAILQ_FIRST(&nd_defrouter); dr;
  540              dr = TAILQ_NEXT(dr, dr_entry)) {
  541                 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
  542                         return (dr);
  543         }
  544 
  545         return (NULL);          /* search failed */
  546 }
  547 
  548 void
  549 defrouter_delreq(struct nd_defrouter *dr, int dofree)
  550 {
  551         struct sockaddr_in6 def, mask, gate;
  552 
  553         bzero(&def, sizeof(def));
  554         bzero(&mask, sizeof(mask));
  555         bzero(&gate, sizeof(gate));
  556 
  557         def.sin6_len = mask.sin6_len = gate.sin6_len
  558                 = sizeof(struct sockaddr_in6);
  559         def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
  560         gate.sin6_addr = dr->rtaddr;
  561 
  562         rtrequest_global(RTM_DELETE,
  563                          (struct sockaddr *)&def,
  564                          (struct sockaddr *)&gate,
  565                          (struct sockaddr *)&mask,
  566                          RTF_GATEWAY);
  567         if (dofree)             /* XXX: necessary? */
  568                 kfree(dr, M_IP6NDP);
  569 }
  570 
  571 void
  572 defrtrlist_del(struct nd_defrouter *dr)
  573 {
  574         struct nd_defrouter *deldr = NULL;
  575         struct nd_prefix *pr;
  576 
  577         /*
  578          * Flush all the routing table entries that use the router
  579          * as a next hop.
  580          */
  581         if (!ip6_forwarding && ip6_accept_rtadv) {
  582                 /* above is a good condition? */
  583                 rt6_flush(&dr->rtaddr, dr->ifp);
  584         }
  585 
  586         if (dr == TAILQ_FIRST(&nd_defrouter))
  587                 deldr = dr;     /* The router is primary. */
  588 
  589         TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
  590 
  591         /*
  592          * Also delete all the pointers to the router in each prefix lists.
  593          */
  594         for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
  595                 struct nd_pfxrouter *pfxrtr;
  596                 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
  597                         pfxrtr_del(pfxrtr);
  598         }
  599         pfxlist_onlink_check();
  600 
  601         /*
  602          * If the router is the primary one, choose a new one.
  603          * Note that defrouter_select() will remove the current gateway
  604          * from the routing table.
  605          */
  606         if (deldr)
  607                 defrouter_select();
  608 
  609         kfree(dr, M_IP6NDP);
  610 }
  611 
  612 /*
  613  * Default Router Selection according to Section 6.3.6 of RFC 2461:
  614  * 1) Routers that are reachable or probably reachable should be
  615  *    preferred.
  616  * 2) When no routers on the list are known to be reachable or
  617  *    probably reachable, routers SHOULD be selected in a round-robin
  618  *    fashion.
  619  * 3) If the Default Router List is empty, assume that all
  620  *    destinations are on-link.
  621  */
  622 void
  623 defrouter_select(void)
  624 {
  625         struct nd_defrouter *dr, anydr;
  626         struct rtentry *rt = NULL;
  627         struct llinfo_nd6 *ln = NULL;
  628 
  629         mtx_lock(&nd6_mtx);
  630 
  631         /*
  632          * Search for a (probably) reachable router from the list.
  633          */
  634         for (dr = TAILQ_FIRST(&nd_defrouter); dr;
  635              dr = TAILQ_NEXT(dr, dr_entry)) {
  636                 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
  637                     (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
  638                     ND6_IS_LLINFO_PROBREACH(ln)) {
  639                         /* Got it, and move it to the head */
  640                         TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
  641                         TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry);
  642                         break;
  643                 }
  644         }
  645 
  646         if ((dr = TAILQ_FIRST(&nd_defrouter))) {
  647                 /*
  648                  * De-install the previous default gateway and install
  649                  * a new one.
  650                  * Note that if there is no reachable router in the list,
  651                  * the head entry will be used anyway.
  652                  * XXX: do we have to check the current routing table entry?
  653                  */
  654                 bzero(&anydr, sizeof(anydr));
  655                 defrouter_delreq(&anydr, 0);
  656                 defrouter_addreq(dr);
  657         }
  658         else {
  659                 /*
  660                  * The Default Router List is empty, so install the default
  661                  * route to an inteface.
  662                  * XXX: The specification does not say this mechanism should
  663                  * be restricted to hosts, but this would be not useful
  664                  * (even harmful) for routers.
  665                  */
  666                 if (!ip6_forwarding) {
  667                         /*
  668                          * De-install the current default route
  669                          * in advance.
  670                          */
  671                         bzero(&anydr, sizeof(anydr));
  672                         defrouter_delreq(&anydr, 0);
  673                         if (nd6_defifp) {
  674                                 /*
  675                                  * Install a route to the default interface
  676                                  * as default route.
  677                                  * XXX: we enable this for host only, because
  678                                  * this may override a default route installed
  679                                  * a user process (e.g. routing daemon) in a
  680                                  * router case.
  681                                  */
  682                                 defrouter_addifreq(nd6_defifp);
  683                         } else {
  684                                 nd6log((LOG_INFO, "defrouter_select: "
  685                                     "there's no default router and no default"
  686                                     " interface\n"));
  687                         }
  688                 }
  689         }
  690         mtx_unlock(&nd6_mtx);
  691         return;
  692 }
  693 
  694 static struct nd_defrouter *
  695 defrtrlist_update(struct nd_defrouter *new)
  696 {
  697         struct nd_defrouter *dr, *n;
  698 
  699         mtx_lock(&nd6_mtx);
  700 
  701         if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
  702                 /* entry exists */
  703                 if (new->rtlifetime == 0) {
  704                         defrtrlist_del(dr);
  705                         dr = NULL;
  706                 } else {
  707                         /* override */
  708                         dr->flags = new->flags; /* xxx flag check */
  709                         dr->rtlifetime = new->rtlifetime;
  710                         dr->expire = new->expire;
  711                 }
  712                 mtx_unlock(&nd6_mtx);
  713                 return (dr);
  714         }
  715 
  716         /* entry does not exist */
  717         if (new->rtlifetime == 0) {
  718                 mtx_unlock(&nd6_mtx);
  719                 return (NULL);
  720         }
  721 
  722         n = (struct nd_defrouter *)kmalloc(sizeof(*n), M_IP6NDP,
  723             M_NOWAIT | M_ZERO);
  724         if (n == NULL) {
  725                 mtx_unlock(&nd6_mtx);
  726                 return (NULL);
  727         }
  728         *n = *new;
  729 
  730         /*
  731          * Insert the new router at the end of the Default Router List.
  732          * If there is no other router, install it anyway. Otherwise,
  733          * just continue to use the current default router.
  734          */
  735         TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry);
  736         if (TAILQ_FIRST(&nd_defrouter) == n)
  737                 defrouter_select();
  738         mtx_unlock(&nd6_mtx);
  739         return (n);
  740 }
  741 
  742 static struct nd_pfxrouter *
  743 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
  744 {
  745         struct nd_pfxrouter *search;
  746 
  747         for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
  748                 if (search->router == dr)
  749                         break;
  750         }
  751 
  752         return (search);
  753 }
  754 
  755 static void
  756 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
  757 {
  758         struct nd_pfxrouter *new;
  759 
  760         new = (struct nd_pfxrouter *)kmalloc(sizeof(*new), M_IP6NDP,
  761             M_NOWAIT | M_ZERO);
  762         if (new == NULL)
  763                 return;
  764         new->router = dr;
  765 
  766         LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
  767 
  768         pfxlist_onlink_check();
  769 }
  770 
  771 static void
  772 pfxrtr_del(struct nd_pfxrouter *pfr)
  773 {
  774         LIST_REMOVE(pfr, pfr_entry);
  775         kfree(pfr, M_IP6NDP);
  776 }
  777 
  778 struct nd_prefix *
  779 nd6_prefix_lookup(struct nd_prefix *pr)
  780 {
  781         struct nd_prefix *search;
  782 
  783         for (search = nd_prefix.lh_first; search; search = search->ndpr_next) {
  784                 if (pr->ndpr_ifp == search->ndpr_ifp &&
  785                     pr->ndpr_plen == search->ndpr_plen &&
  786                     in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
  787                                          &search->ndpr_prefix.sin6_addr,
  788                                          pr->ndpr_plen)
  789                     ) {
  790                         break;
  791                 }
  792         }
  793 
  794         return (search);
  795 }
  796 
  797 int
  798 nd6_prelist_add(struct nd_prefix *pr, struct nd_defrouter *dr,
  799                 struct nd_prefix **newp)
  800 {
  801         struct nd_prefix *new = NULL;
  802         int i;
  803 
  804         new = (struct nd_prefix *)kmalloc(sizeof(*new), M_IP6NDP,
  805             M_NOWAIT | M_ZERO);
  806         if (new == NULL)
  807                 return ENOMEM;
  808         *new = *pr;
  809         if (newp != NULL)
  810                 *newp = new;
  811 
  812         /* initilization */
  813         LIST_INIT(&new->ndpr_advrtrs);
  814         in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
  815         /* make prefix in the canonical form */
  816         for (i = 0; i < 4; i++)
  817                 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
  818                         new->ndpr_mask.s6_addr32[i];
  819 
  820         mtx_lock(&nd6_mtx);
  821         /* link ndpr_entry to nd_prefix list */
  822         LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry);
  823         mtx_unlock(&nd6_mtx);
  824 
  825         /* ND_OPT_PI_FLAG_ONLINK processing */
  826         if (new->ndpr_raf_onlink) {
  827                 int e;
  828 
  829                 if ((e = nd6_prefix_onlink(new)) != 0) {
  830                         nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
  831                             "the prefix %s/%d on-link on %s (errno=%d)\n",
  832                             ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
  833                             pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  834                         /* proceed anyway. XXX: is it correct? */
  835                 }
  836         }
  837 
  838         if (dr) {
  839                 pfxrtr_add(new, dr);
  840         }
  841 
  842         return 0;
  843 }
  844 
  845 void
  846 prelist_remove(struct nd_prefix *pr)
  847 {
  848         struct nd_pfxrouter *pfr, *next;
  849         int e;
  850 
  851         /* make sure to invalidate the prefix until it is really freed. */
  852         pr->ndpr_vltime = 0;
  853         pr->ndpr_pltime = 0;
  854 #if 0
  855         /*
  856          * Though these flags are now meaningless, we'd rather keep the value
  857          * not to confuse users when executing "ndp -p".
  858          */
  859         pr->ndpr_raf_onlink = 0;
  860         pr->ndpr_raf_auto = 0;
  861 #endif
  862         if ((pr->ndpr_stateflags & NDPRF_ONLINK) &&
  863             (e = nd6_prefix_offlink(pr)) != 0) {
  864                 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
  865                     "on %s, errno=%d\n",
  866                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
  867                     pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  868                 /* what should we do? */
  869         }
  870 
  871         if (pr->ndpr_refcnt > 0)
  872                 return;         /* notice here? */
  873 
  874         mtx_lock(&nd6_mtx);
  875 
  876         /* unlink ndpr_entry from nd_prefix list */
  877         LIST_REMOVE(pr, ndpr_entry);
  878 
  879         /* free list of routers that adversed the prefix */
  880         for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
  881                 next = pfr->pfr_next;
  882 
  883                 kfree(pfr, M_IP6NDP);
  884         }
  885         mtx_unlock(&nd6_mtx);
  886 
  887         kfree(pr, M_IP6NDP);
  888 
  889         pfxlist_onlink_check();
  890 }
  891 
  892 /*
  893  * Parameters:
  894  *      dr:     may be NULL
  895  */
  896 int
  897 prelist_update(struct nd_prefix *new, struct nd_defrouter *dr, struct mbuf *m)
  898 {
  899         struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
  900         struct ifaddr_container *ifac;
  901         struct ifnet *ifp = new->ndpr_ifp;
  902         struct nd_prefix *pr;
  903         int error = 0;
  904         int auth;
  905         struct in6_addrlifetime lt6_tmp;
  906 
  907         auth = 0;
  908         mtx_lock(&nd6_mtx);
  909         if (m) {
  910                 /*
  911                  * Authenticity for NA consists authentication for
  912                  * both IP header and IP datagrams, doesn't it ?
  913                  */
  914 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
  915                 auth = (m->m_flags & M_AUTHIPHDR
  916                      && m->m_flags & M_AUTHIPDGM) ? 1 : 0;
  917 #endif
  918         }
  919 
  920 
  921         if ((pr = nd6_prefix_lookup(new)) != NULL) {
  922                 /*
  923                  * nd6_prefix_lookup() ensures that pr and new have the same
  924                  * prefix on a same interface.
  925                  */
  926 
  927                 /*
  928                  * Update prefix information.  Note that the on-link (L) bit
  929                  * and the autonomous (A) bit should NOT be changed from 1
  930                  * to 0.
  931                  */
  932                 if (new->ndpr_raf_onlink == 1)
  933                         pr->ndpr_raf_onlink = 1;
  934                 if (new->ndpr_raf_auto == 1)
  935                         pr->ndpr_raf_auto = 1;
  936                 if (new->ndpr_raf_onlink) {
  937                         pr->ndpr_vltime = new->ndpr_vltime;
  938                         pr->ndpr_pltime = new->ndpr_pltime;
  939                         pr->ndpr_preferred = new->ndpr_preferred;
  940                         pr->ndpr_expire = new->ndpr_expire;
  941                 }
  942 
  943                 if (new->ndpr_raf_onlink &&
  944                     !(pr->ndpr_stateflags & NDPRF_ONLINK)) {
  945                         int e;
  946 
  947                         if ((e = nd6_prefix_onlink(pr)) != 0) {
  948                                 nd6log((LOG_ERR,
  949                                     "prelist_update: failed to make "
  950                                     "the prefix %s/%d on-link on %s "
  951                                     "(errno=%d)\n",
  952                                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
  953                                     pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  954                                 /* proceed anyway. XXX: is it correct? */
  955                         }
  956                 }
  957 
  958                 if (dr && pfxrtr_lookup(pr, dr) == NULL)
  959                         pfxrtr_add(pr, dr);
  960         } else {
  961                 struct nd_prefix *newpr = NULL;
  962 
  963                 if (new->ndpr_vltime == 0)
  964                         goto end;
  965                 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
  966                         goto end;
  967 
  968                 bzero(&new->ndpr_addr, sizeof(struct in6_addr));
  969 
  970                 error = nd6_prelist_add(new, dr, &newpr);
  971                 if (error != 0 || newpr == NULL) {
  972                         nd6log((LOG_NOTICE, "prelist_update: "
  973                             "nd6_prelist_add failed for %s/%d on %s "
  974                             "errno=%d, returnpr=%p\n",
  975                             ip6_sprintf(&new->ndpr_prefix.sin6_addr),
  976                                         new->ndpr_plen, if_name(new->ndpr_ifp),
  977                                         error, newpr));
  978                         goto end; /* we should just give up in this case. */
  979                 }
  980 
  981                 /*
  982                  * XXX: from the ND point of view, we can ignore a prefix
  983                  * with the on-link bit being zero.  However, we need a
  984                  * prefix structure for references from autoconfigured
  985                  * addresses.  Thus, we explicitly make suret that the prefix
  986                  * itself expires now.
  987                  */
  988                 if (newpr->ndpr_raf_onlink == 0) {
  989                         newpr->ndpr_vltime = 0;
  990                         newpr->ndpr_pltime = 0;
  991                         in6_init_prefix_ltimes(newpr);
  992                 }
  993 
  994                 pr = newpr;
  995         }
  996 
  997         /*
  998          * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
  999          * Note that pr must be non NULL at this point.
 1000          */
 1001 
 1002         /* 5.5.3 (a). Ignore the prefix without the A bit set. */
 1003         if (!new->ndpr_raf_auto)
 1004                 goto afteraddrconf;
 1005 
 1006         /*
 1007          * 5.5.3 (b). the link-local prefix should have been ignored in
 1008          * nd6_ra_input.
 1009          */
 1010 
 1011         /*
 1012          * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
 1013          * This should have been done in nd6_ra_input.
 1014          */
 1015 
 1016         /*
 1017          * 5.5.3 (d). If the prefix advertised does not match the prefix of an
 1018          * address already in the list, and the Valid Lifetime is not 0,
 1019          * form an address.  Note that even a manually configured address
 1020          * should reject autoconfiguration of a new address.
 1021          */
 1022         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 1023                 struct ifaddr *ifa = ifac->ifa;
 1024                 struct in6_ifaddr *ifa6;
 1025                 int ifa_plen;
 1026                 u_int32_t storedlifetime;
 1027 
 1028                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1029                         continue;
 1030 
 1031                 ifa6 = (struct in6_ifaddr *)ifa;
 1032 
 1033                 /*
 1034                  * Spec is not clear here, but I believe we should concentrate
 1035                  * on unicast (i.e. not anycast) addresses.
 1036                  * XXX: other ia6_flags? detached or duplicated?
 1037                  */
 1038                 if (ifa6->ia6_flags & IN6_IFF_ANYCAST)
 1039                         continue;
 1040 
 1041                 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL);
 1042                 if (ifa_plen != new->ndpr_plen ||
 1043                     !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr,
 1044                                           &new->ndpr_prefix.sin6_addr,
 1045                                           ifa_plen))
 1046                         continue;
 1047 
 1048                 if (ia6_match == NULL) /* remember the first one */
 1049                         ia6_match = ifa6;
 1050 
 1051                 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
 1052                         continue;
 1053 
 1054                 /*
 1055                  * An already autoconfigured address matched.  Now that we
 1056                  * are sure there is at least one matched address, we can
 1057                  * proceed to 5.5.3. (e): update the lifetimes according to the
 1058                  * "two hours" rule and the privacy extension.
 1059                  */
 1060 #define TWOHOUR         (120*60)
 1061                 lt6_tmp = ifa6->ia6_lifetime;
 1062 
 1063                 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
 1064                         storedlifetime = ND6_INFINITE_LIFETIME;
 1065                 else if (IFA6_IS_INVALID(ifa6))
 1066                         storedlifetime = 0;
 1067                 else
 1068                         storedlifetime = lt6_tmp.ia6t_expire - time_uptime;
 1069 
 1070                 /* when not updating, keep the current stored lifetime. */
 1071                 lt6_tmp.ia6t_vltime = storedlifetime;
 1072 
 1073                 if (TWOHOUR < new->ndpr_vltime ||
 1074                     storedlifetime < new->ndpr_vltime) {
 1075                         lt6_tmp.ia6t_vltime = new->ndpr_vltime;
 1076                 } else if (storedlifetime <= TWOHOUR
 1077 #if 0
 1078                            /*
 1079                             * This condition is logically redundant, so we just
 1080                             * omit it.
 1081                             * See IPng 6712, 6717, and 6721.
 1082                             */
 1083                            && new->ndpr_vltime <= storedlifetime
 1084 #endif
 1085                         ) {
 1086                         if (auth) {
 1087                                 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
 1088                         }
 1089                 } else {
 1090                         /*
 1091                          * new->ndpr_vltime <= TWOHOUR &&
 1092                          * TWOHOUR < storedlifetime
 1093                          */
 1094                         lt6_tmp.ia6t_vltime = TWOHOUR;
 1095                 }
 1096 
 1097                 /* The 2 hour rule is not imposed for preferred lifetime. */
 1098                 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
 1099 
 1100                 in6_init_address_ltimes(pr, &lt6_tmp);
 1101 
 1102                 /*
 1103                  * When adjusting the lifetimes of an existing temporary
 1104                  * address, only lower the lifetimes.
 1105                  * RFC 3041 3.3. (1).
 1106                  * XXX: how should we modify ia6t_[pv]ltime?
 1107                  */
 1108                 if (ifa6->ia6_flags & IN6_IFF_TEMPORARY) {
 1109                         if (lt6_tmp.ia6t_expire == 0 || /* no expire */
 1110                             lt6_tmp.ia6t_expire >
 1111                             ifa6->ia6_lifetime.ia6t_expire) {
 1112                                 lt6_tmp.ia6t_expire =
 1113                                         ifa6->ia6_lifetime.ia6t_expire;
 1114                         }
 1115                         if (lt6_tmp.ia6t_preferred == 0 || /* no expire */
 1116                             lt6_tmp.ia6t_preferred >
 1117                             ifa6->ia6_lifetime.ia6t_preferred) {
 1118                                 lt6_tmp.ia6t_preferred =
 1119                                         ifa6->ia6_lifetime.ia6t_preferred;
 1120                         }
 1121                 }
 1122 
 1123                 ifa6->ia6_lifetime = lt6_tmp;
 1124         }
 1125         if (ia6_match == NULL && new->ndpr_vltime) {
 1126                 /*
 1127                  * No address matched and the valid lifetime is non-zero.
 1128                  * Create a new address.
 1129                  */
 1130                 if ((ia6 = in6_ifadd(new, NULL)) != NULL) {
 1131                         /*
 1132                          * note that we should use pr (not new) for reference.
 1133                          */
 1134                         pr->ndpr_refcnt++;
 1135                         ia6->ia6_ndpr = pr;
 1136 
 1137 #if 0
 1138                         /* XXXYYY Don't do this, according to Jinmei. */
 1139                         pr->ndpr_addr = new->ndpr_addr;
 1140 #endif
 1141 
 1142                         /*
 1143                          * RFC 3041 3.3 (2).
 1144                          * When a new public address is created as described
 1145                          * in RFC2462, also create a new temporary address.
 1146                          *
 1147                          * RFC 3041 3.5.
 1148                          * When an interface connects to a new link, a new
 1149                          * randomized interface identifier should be generated
 1150                          * immediately together with a new set of temporary
 1151                          * addresses.  Thus, we specifiy 1 as the 2nd arg of
 1152                          * in6_tmpifadd().
 1153                          */
 1154                         if (ip6_use_tempaddr) {
 1155                                 int e;
 1156                                 if ((e = in6_tmpifadd(ia6, 1)) != 0) {
 1157                                         nd6log((LOG_NOTICE, "prelist_update: "
 1158                                             "failed to create a temporary "
 1159                                             "address, errno=%d\n",
 1160                                             e));
 1161                                 }
 1162                         }
 1163 
 1164                         /*
 1165                          * A newly added address might affect the status
 1166                          * of other addresses, so we check and update it.
 1167                          * XXX: what if address duplication happens?
 1168                          */
 1169                         pfxlist_onlink_check();
 1170                 } else {
 1171                         /* just set an error. do not bark here. */
 1172                         error = EADDRNOTAVAIL; /* XXX: might be unused. */
 1173                 }
 1174         }
 1175 
 1176 afteraddrconf:
 1177 
 1178 end:
 1179         mtx_unlock(&nd6_mtx);
 1180         return error;
 1181 }
 1182 
 1183 /*
 1184  * A supplement function used in the on-link detection below;
 1185  * detect if a given prefix has a (probably) reachable advertising router.
 1186  * XXX: lengthy function name...
 1187  */
 1188 static struct nd_pfxrouter *
 1189 find_pfxlist_reachable_router(struct nd_prefix *pr)
 1190 {
 1191         struct nd_pfxrouter *pfxrtr;
 1192         struct rtentry *rt;
 1193         struct llinfo_nd6 *ln;
 1194 
 1195         for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr;
 1196              pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
 1197                 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0,
 1198                                      pfxrtr->router->ifp)) &&
 1199                     (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
 1200                     ND6_IS_LLINFO_PROBREACH(ln))
 1201                         break;  /* found */
 1202         }
 1203 
 1204         return (pfxrtr);
 1205 
 1206 }
 1207 
 1208 /*
 1209  * Check if each prefix in the prefix list has at least one available router
 1210  * that advertised the prefix (a router is "available" if its neighbor cache
 1211  * entry is reachable or probably reachable).
 1212  * If the check fails, the prefix may be off-link, because, for example,
 1213  * we have moved from the network but the lifetime of the prefix has not
 1214  * expired yet.  So we should not use the prefix if there is another prefix
 1215  * that has an available router.
 1216  * But, if there is no prefix that has an available router, we still regards
 1217  * all the prefixes as on-link.  This is because we can't tell if all the
 1218  * routers are simply dead or if we really moved from the network and there
 1219  * is no router around us.
 1220  */
 1221 void
 1222 pfxlist_onlink_check(void)
 1223 {
 1224         struct nd_prefix *pr;
 1225         struct in6_ifaddr *ifa;
 1226 
 1227         /*
 1228          * Check if there is a prefix that has a reachable advertising
 1229          * router.
 1230          */
 1231         for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 1232                 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
 1233                         break;
 1234         }
 1235 
 1236         if (pr) {
 1237                 /*
 1238                  * There is at least one prefix that has a reachable router.
 1239                  * Detach prefixes which have no reachable advertising
 1240                  * router, and attach other prefixes.
 1241                  */
 1242                 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 1243                         /* XXX: a link-local prefix should never be detached */
 1244                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1245                                 continue;
 1246 
 1247                         /*
 1248                          * we aren't interested in prefixes without the L bit
 1249                          * set.
 1250                          */
 1251                         if (pr->ndpr_raf_onlink == 0)
 1252                                 continue;
 1253 
 1254                         if (!(pr->ndpr_stateflags & NDPRF_DETACHED) &&
 1255                             find_pfxlist_reachable_router(pr) == NULL)
 1256                                 pr->ndpr_stateflags |= NDPRF_DETACHED;
 1257                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) &&
 1258                             find_pfxlist_reachable_router(pr) != NULL)
 1259                                 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
 1260                 }
 1261         } else {
 1262                 /* there is no prefix that has a reachable router */
 1263                 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 1264                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1265                                 continue;
 1266 
 1267                         if (pr->ndpr_raf_onlink == 0)
 1268                                 continue;
 1269 
 1270                         if (pr->ndpr_stateflags & NDPRF_DETACHED)
 1271                                 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
 1272                 }
 1273         }
 1274 
 1275         /*
 1276          * Remove each interface route associated with a (just) detached
 1277          * prefix, and reinstall the interface route for a (just) attached
 1278          * prefix.  Note that all attempt of reinstallation does not
 1279          * necessarily success, when a same prefix is shared among multiple
 1280          * interfaces.  Such cases will be handled in nd6_prefix_onlink,
 1281          * so we don't have to care about them.
 1282          */
 1283         for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 1284                 int e;
 1285 
 1286                 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1287                         continue;
 1288 
 1289                 if (pr->ndpr_raf_onlink == 0)
 1290                         continue;
 1291 
 1292                 if ((pr->ndpr_stateflags & NDPRF_DETACHED) &&
 1293                     (pr->ndpr_stateflags & NDPRF_ONLINK)) {
 1294                         if ((e = nd6_prefix_offlink(pr)) != 0) {
 1295                                 nd6log((LOG_ERR,
 1296                                     "pfxlist_onlink_check: failed to "
 1297                                     "make %s/%d offlink, errno=%d\n",
 1298                                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
 1299                                     pr->ndpr_plen, e));
 1300                         }
 1301                 }
 1302                 if (!(pr->ndpr_stateflags & NDPRF_DETACHED) &&
 1303                     !(pr->ndpr_stateflags & NDPRF_ONLINK) &&
 1304                     pr->ndpr_raf_onlink) {
 1305                         if ((e = nd6_prefix_onlink(pr)) != 0) {
 1306                                 nd6log((LOG_ERR,
 1307                                     "pfxlist_onlink_check: failed to "
 1308                                     "make %s/%d offlink, errno=%d\n",
 1309                                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
 1310                                     pr->ndpr_plen, e));
 1311                         }
 1312                 }
 1313         }
 1314 
 1315         /*
 1316          * Changes on the prefix status might affect address status as well.
 1317          * Make sure that all addresses derived from an attached prefix are
 1318          * attached, and that all addresses derived from a detached prefix are
 1319          * detached.  Note, however, that a manually configured address should
 1320          * always be attached.
 1321          * The precise detection logic is same as the one for prefixes.
 1322          */
 1323         for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
 1324                 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
 1325                         continue;
 1326 
 1327                 if (ifa->ia6_ndpr == NULL) {
 1328                         /*
 1329                          * This can happen when we first configure the address
 1330                          * (i.e. the address exists, but the prefix does not).
 1331                          * XXX: complicated relationships...
 1332                          */
 1333                         continue;
 1334                 }
 1335 
 1336                 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
 1337                         break;
 1338         }
 1339         if (ifa) {
 1340                 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
 1341                         if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
 1342                                 continue;
 1343 
 1344                         if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
 1345                                 continue;
 1346 
 1347                         if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
 1348                                 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
 1349                         else
 1350                                 ifa->ia6_flags |= IN6_IFF_DETACHED;
 1351                 }
 1352         }
 1353         else {
 1354                 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
 1355                         if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
 1356                                 continue;
 1357 
 1358                         ifa->ia6_flags &= ~IN6_IFF_DETACHED;
 1359                 }
 1360         }
 1361 }
 1362 
 1363 int
 1364 nd6_prefix_onlink(struct nd_prefix *pr)
 1365 {
 1366         struct ifaddr *ifa;
 1367         struct ifnet *ifp = pr->ndpr_ifp;
 1368         struct sockaddr_in6 mask6;
 1369         struct nd_prefix *opr;
 1370         u_long rtflags;
 1371         int error = 0;
 1372 
 1373         /* sanity check */
 1374         if (pr->ndpr_stateflags & NDPRF_ONLINK) {
 1375                 nd6log((LOG_ERR,
 1376                     "nd6_prefix_onlink: %s/%d is already on-link\n",
 1377                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen);
 1378                 return (EEXIST));
 1379         }
 1380 
 1381         /*
 1382          * Add the interface route associated with the prefix.  Before
 1383          * installing the route, check if there's the same prefix on another
 1384          * interface, and the prefix has already installed the interface route.
 1385          * Although such a configuration is expected to be rare, we explicitly
 1386          * allow it.
 1387          */
 1388         for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
 1389                 if (opr == pr)
 1390                         continue;
 1391 
 1392                 if (!(opr->ndpr_stateflags & NDPRF_ONLINK))
 1393                         continue;
 1394 
 1395                 if (opr->ndpr_plen == pr->ndpr_plen &&
 1396                     in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
 1397                                          &opr->ndpr_prefix.sin6_addr,
 1398                                          pr->ndpr_plen))
 1399                         return (0);
 1400         }
 1401 
 1402         /*
 1403          * We prefer link-local addresses as the associated interface address.
 1404          */
 1405         /* search for a link-local addr */
 1406         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
 1407                                                       IN6_IFF_NOTREADY|
 1408                                                       IN6_IFF_ANYCAST);
 1409         if (ifa == NULL) {
 1410                 struct ifaddr_container *ifac;
 1411 
 1412                 /* XXX: freebsd does not have ifa_ifwithaf */
 1413                 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 1414                         if (ifac->ifa->ifa_addr->sa_family == AF_INET6) {
 1415                                 ifa = ifac->ifa;
 1416                                 break;
 1417                         }
 1418                 }
 1419                 /* should we care about ia6_flags? */
 1420         }
 1421         if (ifa == NULL) {
 1422                 /*
 1423                  * This can still happen, when, for example, we receive an RA
 1424                  * containing a prefix with the L bit set and the A bit clear,
 1425                  * after removing all IPv6 addresses on the receiving
 1426                  * interface.  This should, of course, be rare though.
 1427                  */
 1428                 nd6log((LOG_NOTICE,
 1429                     "nd6_prefix_onlink: failed to find any ifaddr"
 1430                     " to add route for a prefix(%s/%d) on %s\n",
 1431                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
 1432                     pr->ndpr_plen, if_name(ifp)));
 1433                 return (0);
 1434         }
 1435 
 1436         /*
 1437          * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
 1438          * ifa->ifa_rtrequest = nd6_rtrequest;
 1439          */
 1440         bzero(&mask6, sizeof(mask6));
 1441         mask6.sin6_len = sizeof(mask6);
 1442         mask6.sin6_addr = pr->ndpr_mask;
 1443         rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP;
 1444         if (nd6_need_cache(ifp)) {
 1445                 /* explicitly set in case ifa_flags does not set the flag. */
 1446                 rtflags |= RTF_CLONING;
 1447         } else {
 1448                 /*
 1449                  * explicitly clear the cloning bit in case ifa_flags sets it.
 1450                  */
 1451                 rtflags &= ~RTF_CLONING;
 1452         }
 1453         error = rtrequest_global(RTM_ADD,
 1454                                  (struct sockaddr *)&pr->ndpr_prefix,
 1455                                  ifa->ifa_addr,
 1456                                  (struct sockaddr *)&mask6,
 1457                                  rtflags);
 1458         if (error == 0) {
 1459                 pr->ndpr_stateflags |= NDPRF_ONLINK;
 1460         }
 1461         else {
 1462                 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
 1463                     " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
 1464                     "errno = %d\n",
 1465                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
 1466                     pr->ndpr_plen, if_name(ifp),
 1467                     ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
 1468                     ip6_sprintf(&mask6.sin6_addr), rtflags, error));
 1469         }
 1470         return (error);
 1471 }
 1472 
 1473 int
 1474 nd6_prefix_offlink(struct nd_prefix *pr)
 1475 {
 1476         int error = 0;
 1477         struct ifnet *ifp = pr->ndpr_ifp;
 1478         struct nd_prefix *opr;
 1479         struct sockaddr_in6 sa6, mask6;
 1480 
 1481         /* sanity check */
 1482         if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) {
 1483                 nd6log((LOG_ERR,
 1484                     "nd6_prefix_offlink: %s/%d is already off-link\n",
 1485                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen));
 1486                 return (EEXIST);
 1487         }
 1488 
 1489         bzero(&sa6, sizeof(sa6));
 1490         sa6.sin6_family = AF_INET6;
 1491         sa6.sin6_len = sizeof(sa6);
 1492         bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
 1493               sizeof(struct in6_addr));
 1494         bzero(&mask6, sizeof(mask6));
 1495         mask6.sin6_family = AF_INET6;
 1496         mask6.sin6_len = sizeof(sa6);
 1497         bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
 1498         error = rtrequest_global(RTM_DELETE,
 1499                                  (struct sockaddr *)&sa6,
 1500                                  NULL,
 1501                                  (struct sockaddr *)&mask6,
 1502                                  0);
 1503         if (error == 0) {
 1504                 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
 1505 
 1506                 /*
 1507                  * There might be the same prefix on another interface,
 1508                  * the prefix which could not be on-link just because we have
 1509                  * the interface route (see comments in nd6_prefix_onlink).
 1510                  * If there's one, try to make the prefix on-link on the
 1511                  * interface.
 1512                  */
 1513                 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
 1514                         if (opr == pr)
 1515                                 continue;
 1516 
 1517                         if (opr->ndpr_stateflags & NDPRF_ONLINK)
 1518                                 continue;
 1519 
 1520                         /*
 1521                          * KAME specific: detached prefixes should not be
 1522                          * on-link.
 1523                          */
 1524                         if (opr->ndpr_stateflags & NDPRF_DETACHED)
 1525                                 continue;
 1526 
 1527                         if (opr->ndpr_plen == pr->ndpr_plen &&
 1528                             in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
 1529                                                  &opr->ndpr_prefix.sin6_addr,
 1530                                                  pr->ndpr_plen)) {
 1531                                 int e;
 1532 
 1533                                 if ((e = nd6_prefix_onlink(opr)) != 0) {
 1534                                         nd6log((LOG_ERR,
 1535                                             "nd6_prefix_offlink: failed to "
 1536                                             "recover a prefix %s/%d from %s "
 1537                                             "to %s (errno = %d)\n",
 1538                                             ip6_sprintf(&opr->ndpr_prefix.sin6_addr),
 1539                                             opr->ndpr_plen, if_name(ifp),
 1540                                             if_name(opr->ndpr_ifp), e));
 1541                                 }
 1542                         }
 1543                 }
 1544         }
 1545         else {
 1546                 /* XXX: can we still set the NDPRF_ONLINK flag? */
 1547                 nd6log((LOG_ERR,
 1548                     "nd6_prefix_offlink: failed to delete route: "
 1549                     "%s/%d on %s (errno = %d)\n",
 1550                     ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp),
 1551                     error));
 1552         }
 1553 
 1554         return (error);
 1555 }
 1556 
 1557 /*
 1558  * Parameters:
 1559  *      ifid:   Mobile IPv6 addition
 1560  */
 1561 static struct in6_ifaddr *
 1562 in6_ifadd(struct nd_prefix *pr, struct in6_addr *ifid)
 1563 {
 1564         struct ifnet *ifp = pr->ndpr_ifp;
 1565         struct ifaddr *ifa;
 1566         struct in6_aliasreq ifra;
 1567         struct in6_ifaddr *ia, *ib;
 1568         int error, plen0;
 1569         struct in6_addr mask;
 1570         int prefixlen = pr->ndpr_plen;
 1571 
 1572         in6_len2mask(&mask, prefixlen);
 1573 
 1574         /*
 1575          * find a link-local address (will be interface ID).
 1576          * Is it really mandatory? Theoretically, a global or a site-local
 1577          * address can be configured without a link-local address, if we
 1578          * have a unique interface identifier...
 1579          *
 1580          * it is not mandatory to have a link-local address, we can generate
 1581          * interface identifier on the fly.  we do this because:
 1582          * (1) it should be the easiest way to find interface identifier.
 1583          * (2) RFC2462 5.4 suggesting the use of the same interface identifier
 1584          * for multiple addresses on a single interface, and possible shortcut
 1585          * of DAD.  we omitted DAD for this reason in the past.
 1586          * (3) a user can prevent autoconfiguration of global address
 1587          * by removing link-local address by hand (this is partly because we
 1588          * don't have other way to control the use of IPv6 on a interface.
 1589          * this has been our design choice - cf. NRL's "ifconfig auto").
 1590          * (4) it is easier to manage when an interface has addresses
 1591          * with the same interface identifier, than to have multiple addresses
 1592          * with different interface identifiers.
 1593          *
 1594          * Mobile IPv6 addition: allow for caller to specify a wished interface
 1595          * ID. This is to not break connections when moving addresses between
 1596          * interfaces.
 1597          */
 1598         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */
 1599         if (ifa)
 1600                 ib = (struct in6_ifaddr *)ifa;
 1601         else
 1602                 return NULL;
 1603 
 1604 #if 0 /* don't care link local addr state, and always do DAD */
 1605         /* if link-local address is not eligible, do not autoconfigure. */
 1606         if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) {
 1607                 kprintf("in6_ifadd: link-local address not ready\n");
 1608                 return NULL;
 1609         }
 1610 #endif
 1611 
 1612         /* prefixlen + ifidlen must be equal to 128 */
 1613         plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
 1614         if (prefixlen != plen0) {
 1615                 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
 1616                     "(prefix=%d ifid=%d)\n",
 1617                     if_name(ifp), prefixlen, 128 - plen0));
 1618                 return NULL;
 1619         }
 1620 
 1621         /* make ifaddr */
 1622 
 1623         bzero(&ifra, sizeof(ifra));
 1624         /*
 1625          * in6_update_ifa() does not use ifra_name, but we accurately set it
 1626          * for safety.
 1627          */
 1628         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
 1629         ifra.ifra_addr.sin6_family = AF_INET6;
 1630         ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
 1631         /* prefix */
 1632         bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr,
 1633               sizeof(ifra.ifra_addr.sin6_addr));
 1634         ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
 1635         ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
 1636         ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
 1637         ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
 1638 
 1639         /* interface ID */
 1640         if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid))
 1641                 ifid = &ib->ia_addr.sin6_addr;
 1642         ifra.ifra_addr.sin6_addr.s6_addr32[0]
 1643                 |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]);
 1644         ifra.ifra_addr.sin6_addr.s6_addr32[1]
 1645                 |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]);
 1646         ifra.ifra_addr.sin6_addr.s6_addr32[2]
 1647                 |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]);
 1648         ifra.ifra_addr.sin6_addr.s6_addr32[3]
 1649                 |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]);
 1650 
 1651         /* new prefix mask. */
 1652         ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
 1653         ifra.ifra_prefixmask.sin6_family = AF_INET6;
 1654         bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
 1655               sizeof(ifra.ifra_prefixmask.sin6_addr));
 1656 
 1657         /*
 1658          * lifetime.
 1659          * XXX: in6_init_address_ltimes would override these values later.
 1660          * We should reconsider this logic.
 1661          */
 1662         ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
 1663         ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
 1664 
 1665         /* XXX: scope zone ID? */
 1666 
 1667         ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
 1668         /*
 1669          * temporarily set the nopfx flag to avoid conflict.
 1670          * XXX: we should reconsider the entire mechanism about prefix
 1671          * manipulation.
 1672          */
 1673         ifra.ifra_flags |= IN6_IFF_NOPFX;
 1674 
 1675         /*
 1676          * keep the new address, regardless of the result of in6_update_ifa.
 1677          * XXX: this address is now meaningless.
 1678          * We should reconsider its role.
 1679          */
 1680         pr->ndpr_addr = ifra.ifra_addr.sin6_addr;
 1681 
 1682         /* allocate ifaddr structure, link into chain, etc. */
 1683         if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
 1684                 nd6log((LOG_ERR,
 1685                     "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
 1686                     ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp),
 1687                     error));
 1688                 return (NULL);  /* ifaddr must not have been allocated. */
 1689         }
 1690 
 1691         ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
 1692 
 1693         return (ia);            /* this must NOT be NULL. */
 1694 }
 1695 
 1696 /*
 1697  * Parameters:
 1698  *      ia0:    corresponding public address
 1699  */
 1700 int
 1701 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen)
 1702 {
 1703         struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
 1704         struct in6_ifaddr *newia;
 1705         struct in6_aliasreq ifra;
 1706         int i, error;
 1707         int trylimit = 3;       /* XXX: adhoc value */
 1708         u_int32_t randid[2];
 1709         time_t vltime0, pltime0;
 1710 
 1711         bzero(&ifra, sizeof(ifra));
 1712         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
 1713         ifra.ifra_addr = ia0->ia_addr;
 1714         /* copy prefix mask */
 1715         ifra.ifra_prefixmask = ia0->ia_prefixmask;
 1716         /* clear the old IFID */
 1717         for (i = 0; i < 4; i++) {
 1718                 ifra.ifra_addr.sin6_addr.s6_addr32[i]
 1719                         &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
 1720         }
 1721 
 1722 again:
 1723         in6_get_tmpifid(ifp, (u_int8_t *)randid,
 1724                         (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8],
 1725                         forcegen);
 1726         ifra.ifra_addr.sin6_addr.s6_addr32[2]
 1727                 |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
 1728         ifra.ifra_addr.sin6_addr.s6_addr32[3]
 1729                 |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
 1730 
 1731         /*
 1732          * If by chance the new temporary address is the same as an address
 1733          * already assigned to the interface, generate a new randomized
 1734          * interface identifier and repeat this step.
 1735          * RFC 3041 3.3 (4).
 1736          */
 1737         if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) {
 1738                 if (trylimit-- == 0) {
 1739                         nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find "
 1740                             "a unique random IFID\n"));
 1741                         return (EEXIST);
 1742                 }
 1743                 forcegen = 1;
 1744                 goto again;
 1745         }
 1746 
 1747         /*
 1748          * The Valid Lifetime is the lower of the Valid Lifetime of the
 1749          * public address or TEMP_VALID_LIFETIME.
 1750          * The Preferred Lifetime is the lower of the Preferred Lifetime
 1751          * of the public address or TEMP_PREFERRED_LIFETIME -
 1752          * DESYNC_FACTOR.
 1753          */
 1754         if (ia0->ia6_lifetime.ia6t_expire != 0) {
 1755                 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
 1756                         (ia0->ia6_lifetime.ia6t_expire - time_uptime);
 1757                 if (vltime0 > ip6_temp_valid_lifetime)
 1758                         vltime0 = ip6_temp_valid_lifetime;
 1759         } else
 1760                 vltime0 = ip6_temp_valid_lifetime;
 1761         if (ia0->ia6_lifetime.ia6t_preferred != 0) {
 1762                 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
 1763                         (ia0->ia6_lifetime.ia6t_preferred - time_uptime);
 1764                 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor) {
 1765                         pltime0 = ip6_temp_preferred_lifetime -
 1766                                 ip6_desync_factor;
 1767                 }
 1768         } else
 1769                 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor;
 1770         ifra.ifra_lifetime.ia6t_vltime = vltime0;
 1771         ifra.ifra_lifetime.ia6t_pltime = pltime0;
 1772 
 1773         /*
 1774          * A temporary address is created only if this calculated Preferred
 1775          * Lifetime is greater than REGEN_ADVANCE time units.
 1776          */
 1777         if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance)
 1778                 return (0);
 1779 
 1780         /* XXX: scope zone ID? */
 1781 
 1782         ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
 1783 
 1784         /* allocate ifaddr structure, link into chain, etc. */
 1785         if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0)
 1786                 return (error);
 1787 
 1788         newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
 1789         if (newia == NULL) {    /* XXX: can it happen? */
 1790                 nd6log((LOG_ERR,
 1791                     "in6_tmpifadd: ifa update succeeded, but we got "
 1792                     "no ifaddr\n"));
 1793                 return (EINVAL); /* XXX */
 1794         }
 1795         newia->ia6_ndpr = ia0->ia6_ndpr;
 1796         newia->ia6_ndpr->ndpr_refcnt++;
 1797 
 1798         return (0);
 1799 }
 1800 
 1801 int
 1802 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
 1803 {
 1804         /* check if preferred lifetime > valid lifetime.  RFC2462 5.5.3 (c) */
 1805         if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) {
 1806                 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime"
 1807                     "(%d) is greater than valid lifetime(%d)\n",
 1808                     (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime));
 1809                 return (EINVAL);
 1810         }
 1811         if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
 1812                 ndpr->ndpr_preferred = 0;
 1813         else
 1814                 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime;
 1815         if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
 1816                 ndpr->ndpr_expire = 0;
 1817         else
 1818                 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime;
 1819 
 1820         return 0;
 1821 }
 1822 
 1823 static void
 1824 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
 1825 {
 1826         /* init ia6t_expire */
 1827         if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
 1828                 lt6->ia6t_expire = 0;
 1829         else {
 1830                 lt6->ia6t_expire = time_uptime;
 1831                 lt6->ia6t_expire += lt6->ia6t_vltime;
 1832         }
 1833 
 1834         /* init ia6t_preferred */
 1835         if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
 1836                 lt6->ia6t_preferred = 0;
 1837         else {
 1838                 lt6->ia6t_preferred = time_uptime;
 1839                 lt6->ia6t_preferred += lt6->ia6t_pltime;
 1840         }
 1841 }
 1842 
 1843 /*
 1844  * Delete all the routing table entries that use the specified gateway.
 1845  *
 1846  * XXX: this function causes search through all entries of routing table, so
 1847  * it shouldn't be called when acting as a router.
 1848  */
 1849 void
 1850 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
 1851 {
 1852         struct radix_node_head *rnh = rt_tables[mycpuid][AF_INET6];
 1853 
 1854         /* We'll care only link-local addresses */
 1855         if (!IN6_IS_ADDR_LINKLOCAL(gateway))
 1856                 return;
 1857         /* XXX: hack for KAME's link-local address kludge */
 1858         gateway->s6_addr16[1] = htons(ifp->if_index);
 1859 
 1860         rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
 1861 }
 1862 
 1863 static int
 1864 rt6_deleteroute(struct radix_node *rn, void *arg)
 1865 {
 1866 #define SIN6(s) ((struct sockaddr_in6 *)s)
 1867         struct rtentry *rt = (struct rtentry *)rn;
 1868         struct in6_addr *gate = (struct in6_addr *)arg;
 1869 
 1870         if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
 1871                 return (0);
 1872 
 1873         if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr))
 1874                 return (0);
 1875 
 1876         /*
 1877          * Do not delete a static route.
 1878          * XXX: this seems to be a bit ad-hoc. Should we consider the
 1879          * 'cloned' bit instead?
 1880          */
 1881         if (rt->rt_flags & RTF_STATIC)
 1882                 return (0);
 1883 
 1884         /*
 1885          * We delete only host route. This means, in particular, we don't
 1886          * delete default route.
 1887          */
 1888         if (!(rt->rt_flags & RTF_HOST))
 1889                 return (0);
 1890 
 1891         return (rtrequest(RTM_DELETE, rt_key(rt),
 1892                          rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0));
 1893 #undef SIN6
 1894 }
 1895 
 1896 int
 1897 nd6_setdefaultiface(int ifindex)
 1898 {
 1899         int error = 0;
 1900 
 1901         if (ifindex < 0 || if_index < ifindex)
 1902                 return (EINVAL);
 1903 
 1904         if (nd6_defifindex != ifindex) {
 1905                 nd6_defifindex = ifindex;
 1906                 if (nd6_defifindex > 0)
 1907                         nd6_defifp = ifindex2ifnet[nd6_defifindex];
 1908                 else
 1909                         nd6_defifp = NULL;
 1910 
 1911                 /*
 1912                  * If the Default Router List is empty, install a route
 1913                  * to the specified interface as default or remove the default
 1914                  * route when the default interface becomes canceled.
 1915                  * The check for the queue is actually redundant, but
 1916                  * we do this here to avoid re-install the default route
 1917                  * if the list is NOT empty.
 1918                  */
 1919                 if (TAILQ_FIRST(&nd_defrouter) == NULL)
 1920                         defrouter_select();
 1921 
 1922                 /*
 1923                  * Our current implementation assumes one-to-one maping between
 1924                  * interfaces and links, so it would be natural to use the
 1925                  * default interface as the default link.
 1926                  */
 1927                 scope6_setdefault(nd6_defifp);
 1928         }
 1929 
 1930         return (error);
 1931 }

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