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: releng/5.4/sys/netinet6/nd6_rtr.c 141090 2005-01-31 23:27:04Z imp $   */
    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 
   48 #include <net/if.h>
   49 #include <net/if_types.h>
   50 #include <net/if_dl.h>
   51 #include <net/route.h>
   52 #include <net/radix.h>
   53 
   54 #include <netinet/in.h>
   55 #include <netinet6/in6_var.h>
   56 #include <netinet6/in6_ifattach.h>
   57 #include <netinet/ip6.h>
   58 #include <netinet6/ip6_var.h>
   59 #include <netinet6/nd6.h>
   60 #include <netinet/icmp6.h>
   61 #include <netinet6/scope6_var.h>
   62 
   63 #include <net/net_osdep.h>
   64 
   65 #define SDL(s)  ((struct sockaddr_dl *)s)
   66 
   67 static struct nd_defrouter *defrtrlist_update __P((struct nd_defrouter *));
   68 static struct in6_ifaddr *in6_ifadd __P((struct nd_prefix *,
   69         struct in6_addr *));
   70 static struct nd_pfxrouter *pfxrtr_lookup __P((struct nd_prefix *,
   71         struct nd_defrouter *));
   72 static void pfxrtr_add __P((struct nd_prefix *, struct nd_defrouter *));
   73 static void pfxrtr_del __P((struct nd_pfxrouter *));
   74 static struct nd_pfxrouter *find_pfxlist_reachable_router
   75         __P((struct nd_prefix *));
   76 static void defrouter_addifreq __P((struct ifnet *));
   77 static void nd6_rtmsg __P((int, struct rtentry *));
   78 
   79 static void in6_init_address_ltimes __P((struct nd_prefix *,
   80         struct in6_addrlifetime *));
   81 
   82 static int rt6_deleteroute __P((struct radix_node *, void *));
   83 
   84 extern int nd6_recalc_reachtm_interval;
   85 
   86 static struct ifnet *nd6_defifp;
   87 int nd6_defifindex;
   88 
   89 int ip6_use_tempaddr = 0;
   90 
   91 int ip6_desync_factor;
   92 u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME;
   93 u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME;
   94 /*
   95  * shorter lifetimes for debugging purposes.
   96 int ip6_temp_preferred_lifetime = 800;
   97 static int ip6_temp_valid_lifetime = 1800;
   98 */
   99 int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE;
  100 
  101 /*
  102  * Receive Router Solicitation Message - just for routers.
  103  * Router solicitation/advertisement is mostly managed by userland program
  104  * (rtadvd) so here we have no function like nd6_ra_output().
  105  *
  106  * Based on RFC 2461
  107  */
  108 void
  109 nd6_rs_input(m, off, icmp6len)
  110         struct  mbuf *m;
  111         int off, icmp6len;
  112 {
  113         struct ifnet *ifp = m->m_pkthdr.rcvif;
  114         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  115         struct nd_router_solicit *nd_rs;
  116         struct in6_addr saddr6 = ip6->ip6_src;
  117         char *lladdr = NULL;
  118         int lladdrlen = 0;
  119 #if 0
  120         struct sockaddr_dl *sdl = (struct sockaddr_dl *)NULL;
  121         struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL;
  122         struct rtentry *rt = NULL;
  123         int is_newentry;
  124 #endif
  125         union nd_opts ndopts;
  126 
  127         /* If I'm not a router, ignore it. */
  128         if (ip6_accept_rtadv != 0 || ip6_forwarding != 1)
  129                 goto freeit;
  130 
  131         /* Sanity checks */
  132         if (ip6->ip6_hlim != 255) {
  133                 nd6log((LOG_ERR,
  134                     "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
  135                     ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
  136                     ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
  137                 goto bad;
  138         }
  139 
  140         /*
  141          * Don't update the neighbor cache, if src = ::.
  142          * This indicates that the src has no IP address assigned yet.
  143          */
  144         if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
  145                 goto freeit;
  146 
  147 #ifndef PULLDOWN_TEST
  148         IP6_EXTHDR_CHECK(m, off, icmp6len,);
  149         nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
  150 #else
  151         IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
  152         if (nd_rs == NULL) {
  153                 icmp6stat.icp6s_tooshort++;
  154                 return;
  155         }
  156 #endif
  157 
  158         icmp6len -= sizeof(*nd_rs);
  159         nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
  160         if (nd6_options(&ndopts) < 0) {
  161                 nd6log((LOG_INFO,
  162                     "nd6_rs_input: invalid ND option, ignored\n"));
  163                 /* nd6_options have incremented stats */
  164                 goto freeit;
  165         }
  166 
  167         if (ndopts.nd_opts_src_lladdr) {
  168                 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
  169                 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
  170         }
  171 
  172         if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
  173                 nd6log((LOG_INFO,
  174                     "nd6_rs_input: lladdrlen mismatch for %s "
  175                     "(if %d, RS packet %d)\n",
  176                     ip6_sprintf(&saddr6),
  177                     ifp->if_addrlen, lladdrlen - 2));
  178                 goto bad;
  179         }
  180 
  181         nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
  182 
  183  freeit:
  184         m_freem(m);
  185         return;
  186 
  187  bad:
  188         icmp6stat.icp6s_badrs++;
  189         m_freem(m);
  190 }
  191 
  192 /*
  193  * Receive Router Advertisement Message.
  194  *
  195  * Based on RFC 2461
  196  * TODO: on-link bit on prefix information
  197  * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
  198  */
  199 void
  200 nd6_ra_input(m, off, icmp6len)
  201         struct  mbuf *m;
  202         int off, icmp6len;
  203 {
  204         struct ifnet *ifp = m->m_pkthdr.rcvif;
  205         struct nd_ifinfo *ndi = ND_IFINFO(ifp);
  206         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  207         struct nd_router_advert *nd_ra;
  208         struct in6_addr saddr6 = ip6->ip6_src;
  209 #if 0
  210         struct in6_addr daddr6 = ip6->ip6_dst;
  211         int flags; /* = nd_ra->nd_ra_flags_reserved; */
  212         int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0);
  213         int is_other = ((flags & ND_RA_FLAG_OTHER) != 0);
  214 #endif
  215         union nd_opts ndopts;
  216         struct nd_defrouter *dr;
  217 
  218         /*
  219          * We only accept RAs only when
  220          * the system-wide variable allows the acceptance, and
  221          * per-interface variable allows RAs on the receiving interface.
  222          */
  223         if (ip6_accept_rtadv == 0)
  224                 goto freeit;
  225         if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
  226                 goto freeit;
  227 
  228         if (ip6->ip6_hlim != 255) {
  229                 nd6log((LOG_ERR,
  230                     "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
  231                     ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
  232                     ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
  233                 goto bad;
  234         }
  235 
  236         if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
  237                 nd6log((LOG_ERR,
  238                     "nd6_ra_input: src %s is not link-local\n",
  239                     ip6_sprintf(&saddr6)));
  240                 goto bad;
  241         }
  242 
  243 #ifndef PULLDOWN_TEST
  244         IP6_EXTHDR_CHECK(m, off, icmp6len,);
  245         nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
  246 #else
  247         IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
  248         if (nd_ra == NULL) {
  249                 icmp6stat.icp6s_tooshort++;
  250                 return;
  251         }
  252 #endif
  253 
  254         icmp6len -= sizeof(*nd_ra);
  255         nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
  256         if (nd6_options(&ndopts) < 0) {
  257                 nd6log((LOG_INFO,
  258                     "nd6_ra_input: invalid ND option, ignored\n"));
  259                 /* nd6_options have incremented stats */
  260                 goto freeit;
  261         }
  262 
  263     {
  264         struct nd_defrouter dr0;
  265         u_int32_t advreachable = nd_ra->nd_ra_reachable;
  266 
  267         dr0.rtaddr = saddr6;
  268         dr0.flags  = nd_ra->nd_ra_flags_reserved;
  269         dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
  270         dr0.expire = time_second + dr0.rtlifetime;
  271         dr0.ifp = ifp;
  272         /* unspecified or not? (RFC 2461 6.3.4) */
  273         if (advreachable) {
  274                 advreachable = ntohl(advreachable);
  275                 if (advreachable <= MAX_REACHABLE_TIME &&
  276                     ndi->basereachable != advreachable) {
  277                         ndi->basereachable = advreachable;
  278                         ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
  279                         ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */
  280                 }
  281         }
  282         if (nd_ra->nd_ra_retransmit)
  283                 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
  284         if (nd_ra->nd_ra_curhoplimit)
  285                 ndi->chlim = nd_ra->nd_ra_curhoplimit;
  286         dr = defrtrlist_update(&dr0);
  287     }
  288 
  289         /*
  290          * prefix
  291          */
  292         if (ndopts.nd_opts_pi) {
  293                 struct nd_opt_hdr *pt;
  294                 struct nd_opt_prefix_info *pi = NULL;
  295                 struct nd_prefix pr;
  296 
  297                 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
  298                      pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
  299                      pt = (struct nd_opt_hdr *)((caddr_t)pt +
  300                                                 (pt->nd_opt_len << 3))) {
  301                         if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
  302                                 continue;
  303                         pi = (struct nd_opt_prefix_info *)pt;
  304 
  305                         if (pi->nd_opt_pi_len != 4) {
  306                                 nd6log((LOG_INFO,
  307                                     "nd6_ra_input: invalid option "
  308                                     "len %d for prefix information option, "
  309                                     "ignored\n", pi->nd_opt_pi_len));
  310                                 continue;
  311                         }
  312 
  313                         if (128 < pi->nd_opt_pi_prefix_len) {
  314                                 nd6log((LOG_INFO,
  315                                     "nd6_ra_input: invalid prefix "
  316                                     "len %d for prefix information option, "
  317                                     "ignored\n", pi->nd_opt_pi_prefix_len));
  318                                 continue;
  319                         }
  320 
  321                         if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
  322                          || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
  323                                 nd6log((LOG_INFO,
  324                                     "nd6_ra_input: invalid prefix "
  325                                     "%s, ignored\n",
  326                                     ip6_sprintf(&pi->nd_opt_pi_prefix)));
  327                                 continue;
  328                         }
  329 
  330                         /* aggregatable unicast address, rfc2374 */
  331                         if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20
  332                          && pi->nd_opt_pi_prefix_len != 64) {
  333                                 nd6log((LOG_INFO,
  334                                     "nd6_ra_input: invalid prefixlen "
  335                                     "%d for rfc2374 prefix %s, ignored\n",
  336                                     pi->nd_opt_pi_prefix_len,
  337                                     ip6_sprintf(&pi->nd_opt_pi_prefix)));
  338                                 continue;
  339                         }
  340 
  341                         bzero(&pr, sizeof(pr));
  342                         pr.ndpr_prefix.sin6_family = AF_INET6;
  343                         pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
  344                         pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
  345                         pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
  346 
  347                         pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
  348                             ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
  349                         pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
  350                             ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
  351                         pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
  352                         pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
  353                         pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
  354                         if (in6_init_prefix_ltimes(&pr))
  355                                 continue; /* prefix lifetime init failed */
  356                         (void)prelist_update(&pr, dr, m);
  357                 }
  358         }
  359 
  360         /*
  361          * MTU
  362          */
  363         if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
  364                 u_long mtu;
  365                 u_long maxmtu;
  366 
  367                 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
  368 
  369                 /* lower bound */
  370                 if (mtu < IPV6_MMTU) {
  371                         nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
  372                             "mtu=%lu sent from %s, ignoring\n",
  373                             mtu, ip6_sprintf(&ip6->ip6_src)));
  374                         goto skip;
  375                 }
  376 
  377                 /* upper bound */
  378                 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
  379                     ? ndi->maxmtu : ifp->if_mtu;
  380                 if (mtu <= maxmtu) {
  381                         int change = (ndi->linkmtu != mtu);
  382 
  383                         ndi->linkmtu = mtu;
  384                         if (change) /* in6_maxmtu may change */
  385                                 in6_setmaxmtu();
  386                 } else {
  387                         nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
  388                             "mtu=%lu sent from %s; "
  389                             "exceeds maxmtu %lu, ignoring\n",
  390                             mtu, ip6_sprintf(&ip6->ip6_src), maxmtu));
  391                 }
  392         }
  393 
  394  skip:
  395 
  396         /*
  397          * Source link layer address
  398          */
  399     {
  400         char *lladdr = NULL;
  401         int lladdrlen = 0;
  402 
  403         if (ndopts.nd_opts_src_lladdr) {
  404                 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
  405                 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
  406         }
  407 
  408         if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
  409                 nd6log((LOG_INFO,
  410                     "nd6_ra_input: lladdrlen mismatch for %s "
  411                     "(if %d, RA packet %d)\n", ip6_sprintf(&saddr6),
  412                     ifp->if_addrlen, lladdrlen - 2));
  413                 goto bad;
  414         }
  415 
  416         nd6_cache_lladdr(ifp, &saddr6, lladdr,
  417             lladdrlen, ND_ROUTER_ADVERT, 0);
  418 
  419         /*
  420          * Installing a link-layer address might change the state of the
  421          * router's neighbor cache, which might also affect our on-link
  422          * detection of adveritsed prefixes.
  423          */
  424         pfxlist_onlink_check();
  425     }
  426 
  427  freeit:
  428         m_freem(m);
  429         return;
  430 
  431  bad:
  432         icmp6stat.icp6s_badra++;
  433         m_freem(m);
  434 }
  435 
  436 /*
  437  * default router list proccessing sub routines
  438  */
  439 
  440 /* tell the change to user processes watching the routing socket. */
  441 static void
  442 nd6_rtmsg(cmd, rt)
  443         int cmd;
  444         struct rtentry *rt;
  445 {
  446         struct rt_addrinfo info;
  447 
  448         bzero((caddr_t)&info, sizeof(info));
  449         info.rti_info[RTAX_DST] = rt_key(rt);
  450         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
  451         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
  452         info.rti_info[RTAX_IFP] =
  453                 (struct sockaddr *)TAILQ_FIRST(&rt->rt_ifp->if_addrlist);
  454         info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
  455 
  456         rt_missmsg(cmd, &info, rt->rt_flags, 0);
  457 }
  458 
  459 void
  460 defrouter_addreq(new)
  461         struct nd_defrouter *new;
  462 {
  463         struct sockaddr_in6 def, mask, gate;
  464         struct rtentry *newrt = NULL;
  465 
  466         bzero(&def, sizeof(def));
  467         bzero(&mask, sizeof(mask));
  468         bzero(&gate, sizeof(gate));
  469 
  470         def.sin6_len = mask.sin6_len = gate.sin6_len =
  471             sizeof(struct sockaddr_in6);
  472         def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
  473         gate.sin6_addr = new->rtaddr;
  474 
  475         (void)rtrequest(RTM_ADD, (struct sockaddr *)&def,
  476             (struct sockaddr *)&gate, (struct sockaddr *)&mask,
  477             RTF_GATEWAY, &newrt);
  478         if (newrt) {
  479                 RT_LOCK(newrt);
  480                 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
  481                 RT_REMREF(newrt);
  482                 RT_UNLOCK(newrt);
  483         }
  484         return;
  485 }
  486 
  487 /* Add a route to a given interface as default */
  488 void
  489 defrouter_addifreq(ifp)
  490         struct ifnet *ifp;
  491 {
  492         struct sockaddr_in6 def, mask;
  493         struct ifaddr *ifa;
  494         struct rtentry *newrt = NULL;
  495         int error, flags;
  496 
  497         bzero(&def, sizeof(def));
  498         bzero(&mask, sizeof(mask));
  499 
  500         def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6);
  501         def.sin6_family = mask.sin6_family = AF_INET6;
  502 
  503         /*
  504          * Search for an ifaddr beloging to the specified interface.
  505          * XXX: An IPv6 address are required to be assigned on the interface.
  506          */
  507         if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) {
  508                 nd6log((LOG_ERR,        /* better error? */
  509                     "defrouter_addifreq: failed to find an ifaddr "
  510                     "to install a route to interface %s\n",
  511                     if_name(ifp)));
  512                 return;
  513         }
  514 
  515         flags = ifa->ifa_flags;
  516         error = rtrequest(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr,
  517             (struct sockaddr *)&mask, flags, &newrt);
  518         if (error != 0) {
  519                 nd6log((LOG_ERR,
  520                     "defrouter_addifreq: failed to install a route to "
  521                     "interface %s (errno = %d)\n",
  522                     if_name(ifp), error));
  523         } else {
  524                 if (newrt) {
  525                         RT_LOCK(newrt);
  526                         nd6_rtmsg(RTM_ADD, newrt);
  527                         RT_REMREF(newrt);
  528                         RT_UNLOCK(newrt);
  529                 }
  530         }
  531 }
  532 
  533 struct nd_defrouter *
  534 defrouter_lookup(addr, ifp)
  535         struct in6_addr *addr;
  536         struct ifnet *ifp;
  537 {
  538         struct nd_defrouter *dr;
  539 
  540         for (dr = TAILQ_FIRST(&nd_defrouter); dr;
  541              dr = TAILQ_NEXT(dr, dr_entry)) {
  542                 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
  543                         return (dr);
  544         }
  545 
  546         return (NULL);          /* search failed */
  547 }
  548 
  549 void
  550 defrouter_delreq(dr, dofree)
  551         struct nd_defrouter *dr;
  552         int dofree;
  553 {
  554         struct sockaddr_in6 def, mask, gate;
  555         struct rtentry *oldrt = NULL;
  556 
  557         bzero(&def, sizeof(def));
  558         bzero(&mask, sizeof(mask));
  559         bzero(&gate, sizeof(gate));
  560 
  561         def.sin6_len = mask.sin6_len = gate.sin6_len =
  562             sizeof(struct sockaddr_in6);
  563         def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
  564         gate.sin6_addr = dr->rtaddr;
  565 
  566         rtrequest(RTM_DELETE, (struct sockaddr *)&def,
  567             (struct sockaddr *)&gate,
  568             (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt);
  569         if (oldrt) {
  570                 nd6_rtmsg(RTM_DELETE, oldrt);
  571                 RTFREE(oldrt);
  572         }
  573 
  574         if (dofree)             /* XXX: necessary? */
  575                 free(dr, M_IP6NDP);
  576 }
  577 
  578 void
  579 defrtrlist_del(dr)
  580         struct nd_defrouter *dr;
  581 {
  582         struct nd_defrouter *deldr = NULL;
  583         struct nd_prefix *pr;
  584 
  585         /*
  586          * Flush all the routing table entries that use the router
  587          * as a next hop.
  588          */
  589         if (!ip6_forwarding && ip6_accept_rtadv) /* XXX: better condition? */
  590                 rt6_flush(&dr->rtaddr, dr->ifp);
  591 
  592         if (dr == TAILQ_FIRST(&nd_defrouter))
  593                 deldr = dr;     /* The router is primary. */
  594 
  595         TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
  596 
  597         /*
  598          * Also delete all the pointers to the router in each prefix lists.
  599          */
  600         for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
  601                 struct nd_pfxrouter *pfxrtr;
  602                 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
  603                         pfxrtr_del(pfxrtr);
  604         }
  605         pfxlist_onlink_check();
  606 
  607         /*
  608          * If the router is the primary one, choose a new one.
  609          * Note that defrouter_select() will remove the current gateway
  610          * from the routing table.
  611          */
  612         if (deldr)
  613                 defrouter_select();
  614 
  615         free(dr, M_IP6NDP);
  616 }
  617 
  618 /*
  619  * Default Router Selection according to Section 6.3.6 of RFC 2461:
  620  * 1) Routers that are reachable or probably reachable should be
  621  *    preferred.
  622  * 2) When no routers on the list are known to be reachable or
  623  *    probably reachable, routers SHOULD be selected in a round-robin
  624  *    fashion.
  625  * 3) If the Default Router List is empty, assume that all
  626  *    destinations are on-link.
  627  */
  628 void
  629 defrouter_select()
  630 {
  631         int s = splnet();
  632         struct nd_defrouter *dr, anydr;
  633         struct rtentry *rt = NULL;
  634         struct llinfo_nd6 *ln = NULL;
  635 
  636         /*
  637          * Search for a (probably) reachable router from the list.
  638          */
  639         for (dr = TAILQ_FIRST(&nd_defrouter); dr;
  640              dr = TAILQ_NEXT(dr, dr_entry)) {
  641                 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
  642                     (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
  643                     ND6_IS_LLINFO_PROBREACH(ln)) {
  644                         /* Got it, and move it to the head */
  645                         TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
  646                         TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry);
  647                         break;
  648                 }
  649         }
  650 
  651         if ((dr = TAILQ_FIRST(&nd_defrouter))) {
  652                 /*
  653                  * De-install the previous default gateway and install
  654                  * a new one.
  655                  * Note that if there is no reachable router in the list,
  656                  * the head entry will be used anyway.
  657                  * XXX: do we have to check the current routing table entry?
  658                  */
  659                 bzero(&anydr, sizeof(anydr));
  660                 defrouter_delreq(&anydr, 0);
  661                 defrouter_addreq(dr);
  662         }
  663         else {
  664                 /*
  665                  * The Default Router List is empty, so install the default
  666                  * route to an inteface.
  667                  * XXX: The specification does not say this mechanism should
  668                  * be restricted to hosts, but this would be not useful
  669                  * (even harmful) for routers.
  670                  */
  671                 if (!ip6_forwarding) {
  672                         /*
  673                          * De-install the current default route
  674                          * in advance.
  675                          */
  676                         bzero(&anydr, sizeof(anydr));
  677                         defrouter_delreq(&anydr, 0);
  678                         if (nd6_defifp) {
  679                                 /*
  680                                  * Install a route to the default interface
  681                                  * as default route.
  682                                  * XXX: we enable this for host only, because
  683                                  * this may override a default route installed
  684                                  * a user process (e.g. routing daemon) in a
  685                                  * router case.
  686                                  */
  687                                 defrouter_addifreq(nd6_defifp);
  688                         } else {
  689                                 nd6log((LOG_INFO, "defrouter_select: "
  690                                     "there's no default router and no default"
  691                                     " interface\n"));
  692                         }
  693                 }
  694         }
  695 
  696         splx(s);
  697         return;
  698 }
  699 
  700 static struct nd_defrouter *
  701 defrtrlist_update(new)
  702         struct nd_defrouter *new;
  703 {
  704         struct nd_defrouter *dr, *n;
  705         int s = splnet();
  706 
  707         if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
  708                 /* entry exists */
  709                 if (new->rtlifetime == 0) {
  710                         defrtrlist_del(dr);
  711                         dr = NULL;
  712                 } else {
  713                         /* override */
  714                         dr->flags = new->flags; /* xxx flag check */
  715                         dr->rtlifetime = new->rtlifetime;
  716                         dr->expire = new->expire;
  717                 }
  718                 splx(s);
  719                 return (dr);
  720         }
  721 
  722         /* entry does not exist */
  723         if (new->rtlifetime == 0) {
  724                 splx(s);
  725                 return (NULL);
  726         }
  727 
  728         n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
  729         if (n == NULL) {
  730                 splx(s);
  731                 return (NULL);
  732         }
  733         bzero(n, sizeof(*n));
  734         *n = *new;
  735 
  736         /*
  737          * Insert the new router at the end of the Default Router List.
  738          * If there is no other router, install it anyway. Otherwise,
  739          * just continue to use the current default router.
  740          */
  741         TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry);
  742         if (TAILQ_FIRST(&nd_defrouter) == n)
  743                 defrouter_select();
  744         splx(s);
  745 
  746         return (n);
  747 }
  748 
  749 static struct nd_pfxrouter *
  750 pfxrtr_lookup(pr, dr)
  751         struct nd_prefix *pr;
  752         struct nd_defrouter *dr;
  753 {
  754         struct nd_pfxrouter *search;
  755 
  756         for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
  757                 if (search->router == dr)
  758                         break;
  759         }
  760 
  761         return (search);
  762 }
  763 
  764 static void
  765 pfxrtr_add(pr, dr)
  766         struct nd_prefix *pr;
  767         struct nd_defrouter *dr;
  768 {
  769         struct nd_pfxrouter *new;
  770 
  771         new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
  772         if (new == NULL)
  773                 return;
  774         bzero(new, sizeof(*new));
  775         new->router = dr;
  776 
  777         LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
  778 
  779         pfxlist_onlink_check();
  780 }
  781 
  782 static void
  783 pfxrtr_del(pfr)
  784         struct nd_pfxrouter *pfr;
  785 {
  786         LIST_REMOVE(pfr, pfr_entry);
  787         free(pfr, M_IP6NDP);
  788 }
  789 
  790 struct nd_prefix *
  791 nd6_prefix_lookup(pr)
  792         struct nd_prefix *pr;
  793 {
  794         struct nd_prefix *search;
  795 
  796         for (search = nd_prefix.lh_first; search; search = search->ndpr_next) {
  797                 if (pr->ndpr_ifp == search->ndpr_ifp &&
  798                     pr->ndpr_plen == search->ndpr_plen &&
  799                     in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
  800                     &search->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
  801                         break;
  802                 }
  803         }
  804 
  805         return (search);
  806 }
  807 
  808 int
  809 nd6_prelist_add(pr, dr, newp)
  810         struct nd_prefix *pr, **newp;
  811         struct nd_defrouter *dr;
  812 {
  813         struct nd_prefix *new = NULL;
  814         int i, s;
  815 
  816         new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
  817         if (new == NULL)
  818                 return(ENOMEM);
  819         bzero(new, sizeof(*new));
  820         *new = *pr;
  821         if (newp != NULL)
  822                 *newp = new;
  823 
  824         /* initialization */
  825         LIST_INIT(&new->ndpr_advrtrs);
  826         in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
  827         /* make prefix in the canonical form */
  828         for (i = 0; i < 4; i++)
  829                 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
  830                     new->ndpr_mask.s6_addr32[i];
  831 
  832         s = splnet();
  833         /* link ndpr_entry to nd_prefix list */
  834         LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry);
  835         splx(s);
  836 
  837         /* ND_OPT_PI_FLAG_ONLINK processing */
  838         if (new->ndpr_raf_onlink) {
  839                 int e;
  840 
  841                 if ((e = nd6_prefix_onlink(new)) != 0) {
  842                         nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
  843                             "the prefix %s/%d on-link on %s (errno=%d)\n",
  844                             ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
  845                             pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  846                         /* proceed anyway. XXX: is it correct? */
  847                 }
  848         }
  849 
  850         if (dr)
  851                 pfxrtr_add(new, dr);
  852 
  853         return 0;
  854 }
  855 
  856 void
  857 prelist_remove(pr)
  858         struct nd_prefix *pr;
  859 {
  860         struct nd_pfxrouter *pfr, *next;
  861         int e, s;
  862 
  863         /* make sure to invalidate the prefix until it is really freed. */
  864         pr->ndpr_vltime = 0;
  865         pr->ndpr_pltime = 0;
  866 #if 0
  867         /*
  868          * Though these flags are now meaningless, we'd rather keep the value
  869          * not to confuse users when executing "ndp -p".
  870          */
  871         pr->ndpr_raf_onlink = 0;
  872         pr->ndpr_raf_auto = 0;
  873 #endif
  874         if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
  875             (e = nd6_prefix_offlink(pr)) != 0) {
  876                 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
  877                     "on %s, errno=%d\n",
  878                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
  879                     pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  880                 /* what should we do? */
  881         }
  882 
  883         if (pr->ndpr_refcnt > 0)
  884                 return;         /* notice here? */
  885 
  886         s = splnet();
  887 
  888         /* unlink ndpr_entry from nd_prefix list */
  889         LIST_REMOVE(pr, ndpr_entry);
  890 
  891         /* free list of routers that adversed the prefix */
  892         for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
  893                 next = pfr->pfr_next;
  894 
  895                 free(pfr, M_IP6NDP);
  896         }
  897         splx(s);
  898 
  899         free(pr, M_IP6NDP);
  900 
  901         pfxlist_onlink_check();
  902 }
  903 
  904 int
  905 prelist_update(new, dr, m)
  906         struct nd_prefix *new;
  907         struct nd_defrouter *dr; /* may be NULL */
  908         struct mbuf *m;
  909 {
  910         struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
  911         struct ifaddr *ifa;
  912         struct ifnet *ifp = new->ndpr_ifp;
  913         struct nd_prefix *pr;
  914         int s = splnet();
  915         int error = 0;
  916         int newprefix = 0;
  917         int auth;
  918         struct in6_addrlifetime lt6_tmp;
  919 
  920         auth = 0;
  921         if (m) {
  922                 /*
  923                  * Authenticity for NA consists authentication for
  924                  * both IP header and IP datagrams, doesn't it ?
  925                  */
  926 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
  927                 auth = ((m->m_flags & M_AUTHIPHDR) &&
  928                     (m->m_flags & M_AUTHIPDGM));
  929 #endif
  930         }
  931 
  932         if ((pr = nd6_prefix_lookup(new)) != NULL) {
  933                 /*
  934                  * nd6_prefix_lookup() ensures that pr and new have the same
  935                  * prefix on a same interface.
  936                  */
  937 
  938                 /*
  939                  * Update prefix information.  Note that the on-link (L) bit
  940                  * and the autonomous (A) bit should NOT be changed from 1
  941                  * to 0.
  942                  */
  943                 if (new->ndpr_raf_onlink == 1)
  944                         pr->ndpr_raf_onlink = 1;
  945                 if (new->ndpr_raf_auto == 1)
  946                         pr->ndpr_raf_auto = 1;
  947                 if (new->ndpr_raf_onlink) {
  948                         pr->ndpr_vltime = new->ndpr_vltime;
  949                         pr->ndpr_pltime = new->ndpr_pltime;
  950                         pr->ndpr_preferred = new->ndpr_preferred;
  951                         pr->ndpr_expire = new->ndpr_expire;
  952                 }
  953 
  954                 if (new->ndpr_raf_onlink &&
  955                     (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
  956                         int e;
  957 
  958                         if ((e = nd6_prefix_onlink(pr)) != 0) {
  959                                 nd6log((LOG_ERR,
  960                                     "prelist_update: failed to make "
  961                                     "the prefix %s/%d on-link on %s "
  962                                     "(errno=%d)\n",
  963                                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
  964                                     pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  965                                 /* proceed anyway. XXX: is it correct? */
  966                         }
  967                 }
  968 
  969                 if (dr && pfxrtr_lookup(pr, dr) == NULL)
  970                         pfxrtr_add(pr, dr);
  971         } else {
  972                 struct nd_prefix *newpr = NULL;
  973 
  974                 newprefix = 1;
  975 
  976                 if (new->ndpr_vltime == 0)
  977                         goto end;
  978                 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
  979                         goto end;
  980 
  981                 bzero(&new->ndpr_addr, sizeof(struct in6_addr));
  982 
  983                 error = nd6_prelist_add(new, dr, &newpr);
  984                 if (error != 0 || newpr == NULL) {
  985                         nd6log((LOG_NOTICE, "prelist_update: "
  986                             "nd6_prelist_add failed for %s/%d on %s "
  987                             "errno=%d, returnpr=%p\n",
  988                             ip6_sprintf(&new->ndpr_prefix.sin6_addr),
  989                             new->ndpr_plen, if_name(new->ndpr_ifp),
  990                             error, newpr));
  991                         goto end; /* we should just give up in this case. */
  992                 }
  993 
  994                 /*
  995                  * XXX: from the ND point of view, we can ignore a prefix
  996                  * with the on-link bit being zero.  However, we need a
  997                  * prefix structure for references from autoconfigured
  998                  * addresses.  Thus, we explicitly make sure that the prefix
  999                  * itself expires now.
 1000                  */
 1001                 if (newpr->ndpr_raf_onlink == 0) {
 1002                         newpr->ndpr_vltime = 0;
 1003                         newpr->ndpr_pltime = 0;
 1004                         in6_init_prefix_ltimes(newpr);
 1005                 }
 1006 
 1007                 pr = newpr;
 1008         }
 1009 
 1010         /*
 1011          * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
 1012          * Note that pr must be non NULL at this point.
 1013          */
 1014 
 1015         /* 5.5.3 (a). Ignore the prefix without the A bit set. */
 1016         if (!new->ndpr_raf_auto)
 1017                 goto afteraddrconf;
 1018 
 1019         /*
 1020          * 5.5.3 (b). the link-local prefix should have been ignored in
 1021          * nd6_ra_input.
 1022          */
 1023 
 1024         /*
 1025          * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
 1026          * This should have been done in nd6_ra_input.
 1027          */
 1028 
 1029         /*
 1030          * 5.5.3 (d). If the prefix advertised does not match the prefix of an
 1031          * address already in the list, and the Valid Lifetime is not 0,
 1032          * form an address.  Note that even a manually configured address
 1033          * should reject autoconfiguration of a new address.
 1034          */
 1035         TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
 1036                 struct in6_ifaddr *ifa6;
 1037                 int ifa_plen;
 1038                 u_int32_t storedlifetime;
 1039 
 1040                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1041                         continue;
 1042 
 1043                 ifa6 = (struct in6_ifaddr *)ifa;
 1044 
 1045                 /*
 1046                  * Spec is not clear here, but I believe we should concentrate
 1047                  * on unicast (i.e. not anycast) addresses.
 1048                  * XXX: other ia6_flags? detached or duplicated?
 1049                  */
 1050                 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
 1051                         continue;
 1052 
 1053                 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL);
 1054                 if (ifa_plen != new->ndpr_plen ||
 1055                     !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr,
 1056                     &new->ndpr_prefix.sin6_addr, ifa_plen))
 1057                         continue;
 1058 
 1059                 if (ia6_match == NULL) /* remember the first one */
 1060                         ia6_match = ifa6;
 1061 
 1062                 if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1063                         continue;
 1064 
 1065                 /*
 1066                  * An already autoconfigured address matched.  Now that we
 1067                  * are sure there is at least one matched address, we can
 1068                  * proceed to 5.5.3. (e): update the lifetimes according to the
 1069                  * "two hours" rule and the privacy extension.
 1070                  */
 1071 #define TWOHOUR         (120*60)
 1072                 lt6_tmp = ifa6->ia6_lifetime;
 1073 
 1074                 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
 1075                         storedlifetime = ND6_INFINITE_LIFETIME;
 1076                 else if (IFA6_IS_INVALID(ifa6))
 1077                         storedlifetime = 0;
 1078                 else
 1079                         storedlifetime = lt6_tmp.ia6t_expire - time_second;
 1080 
 1081                 /* when not updating, keep the current stored lifetime. */
 1082                 lt6_tmp.ia6t_vltime = storedlifetime;
 1083 
 1084                 if (TWOHOUR < new->ndpr_vltime ||
 1085                     storedlifetime < new->ndpr_vltime) {
 1086                         lt6_tmp.ia6t_vltime = new->ndpr_vltime;
 1087                 } else if (storedlifetime <= TWOHOUR
 1088 #if 0
 1089                            /*
 1090                             * This condition is logically redundant, so we just
 1091                             * omit it.
 1092                             * See IPng 6712, 6717, and 6721.
 1093                             */
 1094                            && new->ndpr_vltime <= storedlifetime
 1095 #endif
 1096                         ) {
 1097                         if (auth) {
 1098                                 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
 1099                         }
 1100                 } else {
 1101                         /*
 1102                          * new->ndpr_vltime <= TWOHOUR &&
 1103                          * TWOHOUR < storedlifetime
 1104                          */
 1105                         lt6_tmp.ia6t_vltime = TWOHOUR;
 1106                 }
 1107 
 1108                 /* The 2 hour rule is not imposed for preferred lifetime. */
 1109                 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
 1110 
 1111                 in6_init_address_ltimes(pr, &lt6_tmp);
 1112 
 1113                 /*
 1114                  * When adjusting the lifetimes of an existing temporary
 1115                  * address, only lower the lifetimes.
 1116                  * RFC 3041 3.3. (1).
 1117                  * XXX: how should we modify ia6t_[pv]ltime?
 1118                  */
 1119                 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
 1120                         if (lt6_tmp.ia6t_expire == 0 || /* no expire */
 1121                             lt6_tmp.ia6t_expire >
 1122                             ifa6->ia6_lifetime.ia6t_expire) {
 1123                                 lt6_tmp.ia6t_expire =
 1124                                     ifa6->ia6_lifetime.ia6t_expire;
 1125                         }
 1126                         if (lt6_tmp.ia6t_preferred == 0 || /* no expire */
 1127                             lt6_tmp.ia6t_preferred >
 1128                             ifa6->ia6_lifetime.ia6t_preferred) {
 1129                                 lt6_tmp.ia6t_preferred =
 1130                                     ifa6->ia6_lifetime.ia6t_preferred;
 1131                         }
 1132                 }
 1133 
 1134                 ifa6->ia6_lifetime = lt6_tmp;
 1135         }
 1136         if (ia6_match == NULL && new->ndpr_vltime) {
 1137                 /*
 1138                  * No address matched and the valid lifetime is non-zero.
 1139                  * Create a new address.
 1140                  */
 1141                 if ((ia6 = in6_ifadd(new, NULL)) != NULL) {
 1142                         /*
 1143                          * note that we should use pr (not new) for reference.
 1144                          */
 1145                         pr->ndpr_refcnt++;
 1146                         ia6->ia6_ndpr = pr;
 1147 
 1148                         /*
 1149                          * RFC 3041 3.3 (2).
 1150                          * When a new public address is created as described
 1151                          * in RFC2462, also create a new temporary address.
 1152                          *
 1153                          * RFC 3041 3.5.
 1154                          * When an interface connects to a new link, a new
 1155                          * randomized interface identifier should be generated
 1156                          * immediately together with a new set of temporary
 1157                          * addresses.  Thus, we specifiy 1 as the 2nd arg of
 1158                          * in6_tmpifadd().
 1159                          */
 1160                         if (ip6_use_tempaddr) {
 1161                                 int e;
 1162                                 if ((e = in6_tmpifadd(ia6, 1)) != 0) {
 1163                                         nd6log((LOG_NOTICE, "prelist_update: "
 1164                                             "failed to create a temporary "
 1165                                             "address, errno=%d\n",
 1166                                             e));
 1167                                 }
 1168                         }
 1169 
 1170                         /*
 1171                          * A newly added address might affect the status
 1172                          * of other addresses, so we check and update it.
 1173                          * XXX: what if address duplication happens?
 1174                          */
 1175                         pfxlist_onlink_check();
 1176                 } else {
 1177                         /* just set an error. do not bark here. */
 1178                         error = EADDRNOTAVAIL; /* XXX: might be unused. */
 1179                 }
 1180         }
 1181 
 1182   afteraddrconf:
 1183 
 1184  end:
 1185         splx(s);
 1186         return error;
 1187 }
 1188 
 1189 /*
 1190  * A supplement function used in the on-link detection below;
 1191  * detect if a given prefix has a (probably) reachable advertising router.
 1192  * XXX: lengthy function name...
 1193  */
 1194 static struct nd_pfxrouter *
 1195 find_pfxlist_reachable_router(pr)
 1196         struct nd_prefix *pr;
 1197 {
 1198         struct nd_pfxrouter *pfxrtr;
 1199         struct rtentry *rt;
 1200         struct llinfo_nd6 *ln;
 1201 
 1202         for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr;
 1203              pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
 1204                 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0,
 1205                     pfxrtr->router->ifp)) &&
 1206                     (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
 1207                     ND6_IS_LLINFO_PROBREACH(ln))
 1208                         break;  /* found */
 1209         }
 1210 
 1211         return (pfxrtr);
 1212 }
 1213 
 1214 /*
 1215  * Check if each prefix in the prefix list has at least one available router
 1216  * that advertised the prefix (a router is "available" if its neighbor cache
 1217  * entry is reachable or probably reachable).
 1218  * If the check fails, the prefix may be off-link, because, for example,
 1219  * we have moved from the network but the lifetime of the prefix has not
 1220  * expired yet.  So we should not use the prefix if there is another prefix
 1221  * that has an available router.
 1222  * But, if there is no prefix that has an available router, we still regards
 1223  * all the prefixes as on-link.  This is because we can't tell if all the
 1224  * routers are simply dead or if we really moved from the network and there
 1225  * is no router around us.
 1226  */
 1227 void
 1228 pfxlist_onlink_check()
 1229 {
 1230         struct nd_prefix *pr;
 1231         struct in6_ifaddr *ifa;
 1232 
 1233         /*
 1234          * Check if there is a prefix that has a reachable advertising
 1235          * router.
 1236          */
 1237         for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 1238                 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
 1239                         break;
 1240         }
 1241 
 1242         if (pr) {
 1243                 /*
 1244                  * There is at least one prefix that has a reachable router.
 1245                  * Detach prefixes which have no reachable advertising
 1246                  * router, and attach other prefixes.
 1247                  */
 1248                 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 1249                         /* XXX: a link-local prefix should never be detached */
 1250                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1251                                 continue;
 1252 
 1253                         /*
 1254                          * we aren't interested in prefixes without the L bit
 1255                          * set.
 1256                          */
 1257                         if (pr->ndpr_raf_onlink == 0)
 1258                                 continue;
 1259 
 1260                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
 1261                             find_pfxlist_reachable_router(pr) == NULL)
 1262                                 pr->ndpr_stateflags |= NDPRF_DETACHED;
 1263                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
 1264                             find_pfxlist_reachable_router(pr) != 0)
 1265                                 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
 1266                 }
 1267         } else {
 1268                 /* there is no prefix that has a reachable router */
 1269                 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 1270                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1271                                 continue;
 1272 
 1273                         if (pr->ndpr_raf_onlink == 0)
 1274                                 continue;
 1275 
 1276                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
 1277                                 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
 1278                 }
 1279         }
 1280 
 1281         /*
 1282          * Remove each interface route associated with a (just) detached
 1283          * prefix, and reinstall the interface route for a (just) attached
 1284          * prefix.  Note that all attempt of reinstallation does not
 1285          * necessarily success, when a same prefix is shared among multiple
 1286          * interfaces.  Such cases will be handled in nd6_prefix_onlink,
 1287          * so we don't have to care about them.
 1288          */
 1289         for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 1290                 int e;
 1291 
 1292                 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1293                         continue;
 1294 
 1295                 if (pr->ndpr_raf_onlink == 0)
 1296                         continue;
 1297 
 1298                 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
 1299                     (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
 1300                         if ((e = nd6_prefix_offlink(pr)) != 0) {
 1301                                 nd6log((LOG_ERR,
 1302                                     "pfxlist_onlink_check: failed to "
 1303                                     "make %s/%d offlink, errno=%d\n",
 1304                                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
 1305                                     pr->ndpr_plen, e));
 1306                         }
 1307                 }
 1308                 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
 1309                     (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
 1310                     pr->ndpr_raf_onlink) {
 1311                         if ((e = nd6_prefix_onlink(pr)) != 0) {
 1312                                 nd6log((LOG_ERR,
 1313                                     "pfxlist_onlink_check: failed to "
 1314                                     "make %s/%d offlink, errno=%d\n",
 1315                                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
 1316                                     pr->ndpr_plen, e));
 1317                         }
 1318                 }
 1319         }
 1320 
 1321         /*
 1322          * Changes on the prefix status might affect address status as well.
 1323          * Make sure that all addresses derived from an attached prefix are
 1324          * attached, and that all addresses derived from a detached prefix are
 1325          * detached.  Note, however, that a manually configured address should
 1326          * always be attached.
 1327          * The precise detection logic is same as the one for prefixes.
 1328          */
 1329         for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
 1330                 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
 1331                         continue;
 1332 
 1333                 if (ifa->ia6_ndpr == NULL) {
 1334                         /*
 1335                          * This can happen when we first configure the address
 1336                          * (i.e. the address exists, but the prefix does not).
 1337                          * XXX: complicated relationships...
 1338                          */
 1339                         continue;
 1340                 }
 1341 
 1342                 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
 1343                         break;
 1344         }
 1345         if (ifa) {
 1346                 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
 1347                         if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1348                                 continue;
 1349 
 1350                         if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
 1351                                 continue;
 1352 
 1353                         if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
 1354                                 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
 1355                         else
 1356                                 ifa->ia6_flags |= IN6_IFF_DETACHED;
 1357                 }
 1358         }
 1359         else {
 1360                 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
 1361                         if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1362                                 continue;
 1363 
 1364                         ifa->ia6_flags &= ~IN6_IFF_DETACHED;
 1365                 }
 1366         }
 1367 }
 1368 
 1369 int
 1370 nd6_prefix_onlink(pr)
 1371         struct nd_prefix *pr;
 1372 {
 1373         struct ifaddr *ifa;
 1374         struct ifnet *ifp = pr->ndpr_ifp;
 1375         struct sockaddr_in6 mask6;
 1376         struct nd_prefix *opr;
 1377         u_long rtflags;
 1378         int error = 0;
 1379         struct rtentry *rt = NULL;
 1380 
 1381         /* sanity check */
 1382         if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
 1383                 nd6log((LOG_ERR,
 1384                     "nd6_prefix_onlink: %s/%d is already on-link\n",
 1385                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen);
 1386                 return (EEXIST));
 1387         }
 1388 
 1389         /*
 1390          * Add the interface route associated with the prefix.  Before
 1391          * installing the route, check if there's the same prefix on another
 1392          * interface, and the prefix has already installed the interface route.
 1393          * Although such a configuration is expected to be rare, we explicitly
 1394          * allow it.
 1395          */
 1396         for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
 1397                 if (opr == pr)
 1398                         continue;
 1399 
 1400                 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
 1401                         continue;
 1402 
 1403                 if (opr->ndpr_plen == pr->ndpr_plen &&
 1404                     in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
 1405                     &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen))
 1406                         return (0);
 1407         }
 1408 
 1409         /*
 1410          * We prefer link-local addresses as the associated interface address.
 1411          */
 1412         /* search for a link-local addr */
 1413         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
 1414             IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
 1415         if (ifa == NULL) {
 1416                 /* XXX: freebsd does not have ifa_ifwithaf */
 1417                 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
 1418                         if (ifa->ifa_addr->sa_family == AF_INET6)
 1419                                 break;
 1420                 }
 1421                 /* should we care about ia6_flags? */
 1422         }
 1423         if (ifa == NULL) {
 1424                 /*
 1425                  * This can still happen, when, for example, we receive an RA
 1426                  * containing a prefix with the L bit set and the A bit clear,
 1427                  * after removing all IPv6 addresses on the receiving
 1428                  * interface.  This should, of course, be rare though.
 1429                  */
 1430                 nd6log((LOG_NOTICE,
 1431                     "nd6_prefix_onlink: failed to find any ifaddr"
 1432                     " to add route for a prefix(%s/%d) on %s\n",
 1433                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
 1434                     pr->ndpr_plen, if_name(ifp)));
 1435                 return (0);
 1436         }
 1437 
 1438         /*
 1439          * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
 1440          * ifa->ifa_rtrequest = nd6_rtrequest;
 1441          */
 1442         bzero(&mask6, sizeof(mask6));
 1443         mask6.sin6_len = sizeof(mask6);
 1444         mask6.sin6_addr = pr->ndpr_mask;
 1445         rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP;
 1446         if (nd6_need_cache(ifp)) {
 1447                 /* explicitly set in case ifa_flags does not set the flag. */
 1448                 rtflags |= RTF_CLONING;
 1449         } else {
 1450                 /*
 1451                  * explicitly clear the cloning bit in case ifa_flags sets it.
 1452                  */
 1453                 rtflags &= ~RTF_CLONING;
 1454         }
 1455         error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
 1456             ifa->ifa_addr, (struct sockaddr *)&mask6, rtflags, &rt);
 1457         if (error == 0) {
 1458                 if (rt != NULL) /* this should be non NULL, though */
 1459                         nd6_rtmsg(RTM_ADD, rt);
 1460                 pr->ndpr_stateflags |= NDPRF_ONLINK;
 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 
 1471         if (rt != NULL) {
 1472                 RT_LOCK(rt);
 1473                 RT_REMREF(rt);
 1474                 RT_UNLOCK(rt);
 1475         }
 1476 
 1477         return (error);
 1478 }
 1479 
 1480 int
 1481 nd6_prefix_offlink(pr)
 1482         struct nd_prefix *pr;
 1483 {
 1484         int error = 0;
 1485         struct ifnet *ifp = pr->ndpr_ifp;
 1486         struct nd_prefix *opr;
 1487         struct sockaddr_in6 sa6, mask6;
 1488         struct rtentry *rt = NULL;
 1489 
 1490         /* sanity check */
 1491         if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
 1492                 nd6log((LOG_ERR,
 1493                     "nd6_prefix_offlink: %s/%d is already off-link\n",
 1494                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen));
 1495                 return (EEXIST);
 1496         }
 1497 
 1498         bzero(&sa6, sizeof(sa6));
 1499         sa6.sin6_family = AF_INET6;
 1500         sa6.sin6_len = sizeof(sa6);
 1501         bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
 1502             sizeof(struct in6_addr));
 1503         bzero(&mask6, sizeof(mask6));
 1504         mask6.sin6_family = AF_INET6;
 1505         mask6.sin6_len = sizeof(sa6);
 1506         bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
 1507         error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
 1508             (struct sockaddr *)&mask6, 0, &rt);
 1509         if (error == 0) {
 1510                 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
 1511 
 1512                 /* report the route deletion to the routing socket. */
 1513                 if (rt != NULL)
 1514                         nd6_rtmsg(RTM_DELETE, rt);
 1515 
 1516                 /*
 1517                  * There might be the same prefix on another interface,
 1518                  * the prefix which could not be on-link just because we have
 1519                  * the interface route (see comments in nd6_prefix_onlink).
 1520                  * If there's one, try to make the prefix on-link on the
 1521                  * interface.
 1522                  */
 1523                 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
 1524                         if (opr == pr)
 1525                                 continue;
 1526 
 1527                         if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
 1528                                 continue;
 1529 
 1530                         /*
 1531                          * KAME specific: detached prefixes should not be
 1532                          * on-link.
 1533                          */
 1534                         if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
 1535                                 continue;
 1536 
 1537                         if (opr->ndpr_plen == pr->ndpr_plen &&
 1538                             in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
 1539                             &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
 1540                                 int e;
 1541 
 1542                                 if ((e = nd6_prefix_onlink(opr)) != 0) {
 1543                                         nd6log((LOG_ERR,
 1544                                             "nd6_prefix_offlink: failed to "
 1545                                             "recover a prefix %s/%d from %s "
 1546                                             "to %s (errno = %d)\n",
 1547                                             ip6_sprintf(&opr->ndpr_prefix.sin6_addr),
 1548                                             opr->ndpr_plen, if_name(ifp),
 1549                                             if_name(opr->ndpr_ifp), e));
 1550                                 }
 1551                         }
 1552                 }
 1553         } else {
 1554                 /* XXX: can we still set the NDPRF_ONLINK flag? */
 1555                 nd6log((LOG_ERR,
 1556                     "nd6_prefix_offlink: failed to delete route: "
 1557                     "%s/%d on %s (errno = %d)\n",
 1558                     ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp),
 1559                     error));
 1560         }
 1561 
 1562         if (rt != NULL) {
 1563                 RTFREE(rt);
 1564         }
 1565 
 1566         return (error);
 1567 }
 1568 
 1569 static struct in6_ifaddr *
 1570 in6_ifadd(pr, ifid)
 1571         struct nd_prefix *pr;
 1572         struct in6_addr  *ifid;   /* Mobile IPv6 addition */
 1573 {
 1574         struct ifnet *ifp = pr->ndpr_ifp;
 1575         struct ifaddr *ifa;
 1576         struct in6_aliasreq ifra;
 1577         struct in6_ifaddr *ia, *ib;
 1578         int error, plen0;
 1579         struct in6_addr mask;
 1580         int prefixlen = pr->ndpr_plen;
 1581 
 1582         in6_prefixlen2mask(&mask, prefixlen);
 1583 
 1584         /*
 1585          * find a link-local address (will be interface ID).
 1586          * Is it really mandatory? Theoretically, a global or a site-local
 1587          * address can be configured without a link-local address, if we
 1588          * have a unique interface identifier...
 1589          *
 1590          * it is not mandatory to have a link-local address, we can generate
 1591          * interface identifier on the fly.  we do this because:
 1592          * (1) it should be the easiest way to find interface identifier.
 1593          * (2) RFC2462 5.4 suggesting the use of the same interface identifier
 1594          * for multiple addresses on a single interface, and possible shortcut
 1595          * of DAD.  we omitted DAD for this reason in the past.
 1596          * (3) a user can prevent autoconfiguration of global address
 1597          * by removing link-local address by hand (this is partly because we
 1598          * don't have other way to control the use of IPv6 on an interface.
 1599          * this has been our design choice - cf. NRL's "ifconfig auto").
 1600          * (4) it is easier to manage when an interface has addresses
 1601          * with the same interface identifier, than to have multiple addresses
 1602          * with different interface identifiers.
 1603          *
 1604          * Mobile IPv6 addition: allow for caller to specify a wished interface
 1605          * ID. This is to not break connections when moving addresses between
 1606          * interfaces.
 1607          */
 1608         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
 1609         if (ifa)
 1610                 ib = (struct in6_ifaddr *)ifa;
 1611         else
 1612                 return NULL;
 1613 
 1614 #if 0 /* don't care link local addr state, and always do DAD */
 1615         /* if link-local address is not eligible, do not autoconfigure. */
 1616         if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) {
 1617                 printf("in6_ifadd: link-local address not ready\n");
 1618                 return NULL;
 1619         }
 1620 #endif
 1621 
 1622         /* prefixlen + ifidlen must be equal to 128 */
 1623         plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
 1624         if (prefixlen != plen0) {
 1625                 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
 1626                     "(prefix=%d ifid=%d)\n",
 1627                     if_name(ifp), prefixlen, 128 - plen0));
 1628                 return NULL;
 1629         }
 1630 
 1631         /* make ifaddr */
 1632 
 1633         bzero(&ifra, sizeof(ifra));
 1634         /*
 1635          * in6_update_ifa() does not use ifra_name, but we accurately set it
 1636          * for safety.
 1637          */
 1638         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
 1639         ifra.ifra_addr.sin6_family = AF_INET6;
 1640         ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
 1641         /* prefix */
 1642         bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr,
 1643             sizeof(ifra.ifra_addr.sin6_addr));
 1644         ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
 1645         ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
 1646         ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
 1647         ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
 1648 
 1649         /* interface ID */
 1650         if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid))
 1651                 ifid = &ib->ia_addr.sin6_addr;
 1652         ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
 1653             (ifid->s6_addr32[0] & ~mask.s6_addr32[0]);
 1654         ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
 1655             (ifid->s6_addr32[1] & ~mask.s6_addr32[1]);
 1656         ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
 1657             (ifid->s6_addr32[2] & ~mask.s6_addr32[2]);
 1658         ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
 1659             (ifid->s6_addr32[3] & ~mask.s6_addr32[3]);
 1660 
 1661         /* new prefix mask. */
 1662         ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
 1663         ifra.ifra_prefixmask.sin6_family = AF_INET6;
 1664         bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
 1665             sizeof(ifra.ifra_prefixmask.sin6_addr));
 1666 
 1667         /*
 1668          * lifetime.
 1669          * XXX: in6_init_address_ltimes would override these values later.
 1670          * We should reconsider this logic.
 1671          */
 1672         ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
 1673         ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
 1674 
 1675         /* XXX: scope zone ID? */
 1676 
 1677         ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
 1678         /*
 1679          * temporarily set the nopfx flag to avoid conflict.
 1680          * XXX: we should reconsider the entire mechanism about prefix
 1681          * manipulation.
 1682          */
 1683         ifra.ifra_flags |= IN6_IFF_NOPFX;
 1684 
 1685         /*
 1686          * keep the new address, regardless of the result of in6_update_ifa.
 1687          * XXX: this address is now meaningless.
 1688          * We should reconsider its role.
 1689          */
 1690         pr->ndpr_addr = ifra.ifra_addr.sin6_addr;
 1691 
 1692         /* allocate ifaddr structure, link into chain, etc. */
 1693         if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
 1694                 nd6log((LOG_ERR,
 1695                     "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
 1696                     ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp),
 1697                     error));
 1698                 return (NULL);  /* ifaddr must not have been allocated. */
 1699         }
 1700 
 1701         ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
 1702 
 1703         return (ia);            /* this is always non-NULL */
 1704 }
 1705 
 1706 int
 1707 in6_tmpifadd(ia0, forcegen)
 1708         const struct in6_ifaddr *ia0; /* corresponding public address */
 1709         int forcegen;
 1710 {
 1711         struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
 1712         struct in6_ifaddr *newia;
 1713         struct in6_aliasreq ifra;
 1714         int i, error;
 1715         int trylimit = 3;       /* XXX: adhoc value */
 1716         u_int32_t randid[2];
 1717         time_t vltime0, pltime0;
 1718 
 1719         bzero(&ifra, sizeof(ifra));
 1720         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
 1721         ifra.ifra_addr = ia0->ia_addr;
 1722         /* copy prefix mask */
 1723         ifra.ifra_prefixmask = ia0->ia_prefixmask;
 1724         /* clear the old IFID */
 1725         for (i = 0; i < 4; i++) {
 1726                 ifra.ifra_addr.sin6_addr.s6_addr32[i] &=
 1727                     ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
 1728         }
 1729 
 1730   again:
 1731         in6_get_tmpifid(ifp, (u_int8_t *)randid,
 1732             (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen);
 1733         ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
 1734             (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
 1735         ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
 1736             (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
 1737 
 1738         /*
 1739          * If by chance the new temporary address is the same as an address
 1740          * already assigned to the interface, generate a new randomized
 1741          * interface identifier and repeat this step.
 1742          * RFC 3041 3.3 (4).
 1743          */
 1744         if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) {
 1745                 if (trylimit-- == 0) {
 1746                         nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find "
 1747                             "a unique random IFID\n"));
 1748                         return (EEXIST);
 1749                 }
 1750                 forcegen = 1;
 1751                 goto again;
 1752         }
 1753 
 1754         /*
 1755          * The Valid Lifetime is the lower of the Valid Lifetime of the
 1756          * public address or TEMP_VALID_LIFETIME.
 1757          * The Preferred Lifetime is the lower of the Preferred Lifetime
 1758          * of the public address or TEMP_PREFERRED_LIFETIME -
 1759          * DESYNC_FACTOR.
 1760          */
 1761         if (ia0->ia6_lifetime.ia6t_expire != 0) {
 1762                 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
 1763                     (ia0->ia6_lifetime.ia6t_expire - time_second);
 1764                 if (vltime0 > ip6_temp_valid_lifetime)
 1765                         vltime0 = ip6_temp_valid_lifetime;
 1766         } else
 1767                 vltime0 = ip6_temp_valid_lifetime;
 1768         if (ia0->ia6_lifetime.ia6t_preferred != 0) {
 1769                 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
 1770                     (ia0->ia6_lifetime.ia6t_preferred - time_second);
 1771                 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor){
 1772                         pltime0 = ip6_temp_preferred_lifetime -
 1773                             ip6_desync_factor;
 1774                 }
 1775         } else
 1776                 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor;
 1777         ifra.ifra_lifetime.ia6t_vltime = vltime0;
 1778         ifra.ifra_lifetime.ia6t_pltime = pltime0;
 1779 
 1780         /*
 1781          * A temporary address is created only if this calculated Preferred
 1782          * Lifetime is greater than REGEN_ADVANCE time units.
 1783          */
 1784         if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance)
 1785                 return (0);
 1786 
 1787         /* XXX: scope zone ID? */
 1788 
 1789         ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
 1790 
 1791         /* allocate ifaddr structure, link into chain, etc. */
 1792         if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0)
 1793                 return (error);
 1794 
 1795         newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
 1796         if (newia == NULL) {    /* XXX: can it happen? */
 1797                 nd6log((LOG_ERR,
 1798                     "in6_tmpifadd: ifa update succeeded, but we got "
 1799                     "no ifaddr\n"));
 1800                 return (EINVAL); /* XXX */
 1801         }
 1802         newia->ia6_ndpr = ia0->ia6_ndpr;
 1803         newia->ia6_ndpr->ndpr_refcnt++;
 1804 
 1805         /*
 1806          * A newly added address might affect the status of other addresses.
 1807          * XXX: when the temporary address is generated with a new public
 1808          * address, the onlink check is redundant.  However, it would be safe
 1809          * to do the check explicitly everywhere a new address is generated,
 1810          * and, in fact, we surely need the check when we create a new
 1811          * temporary address due to deprecation of an old temporary address.
 1812          */
 1813         pfxlist_onlink_check();
 1814 
 1815         return (0);
 1816 }
 1817 
 1818 int
 1819 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
 1820 {
 1821         /* check if preferred lifetime > valid lifetime.  RFC2462 5.5.3 (c) */
 1822         if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) {
 1823                 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime"
 1824                     "(%d) is greater than valid lifetime(%d)\n",
 1825                     (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime));
 1826                 return (EINVAL);
 1827         }
 1828         if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
 1829                 ndpr->ndpr_preferred = 0;
 1830         else
 1831                 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime;
 1832         if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
 1833                 ndpr->ndpr_expire = 0;
 1834         else
 1835                 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime;
 1836 
 1837         return 0;
 1838 }
 1839 
 1840 static void
 1841 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
 1842 {
 1843         /* init ia6t_expire */
 1844         if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
 1845                 lt6->ia6t_expire = 0;
 1846         else {
 1847                 lt6->ia6t_expire = time_second;
 1848                 lt6->ia6t_expire += lt6->ia6t_vltime;
 1849         }
 1850 
 1851         /* init ia6t_preferred */
 1852         if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
 1853                 lt6->ia6t_preferred = 0;
 1854         else {
 1855                 lt6->ia6t_preferred = time_second;
 1856                 lt6->ia6t_preferred += lt6->ia6t_pltime;
 1857         }
 1858 }
 1859 
 1860 /*
 1861  * Delete all the routing table entries that use the specified gateway.
 1862  * XXX: this function causes search through all entries of routing table, so
 1863  * it shouldn't be called when acting as a router.
 1864  */
 1865 void
 1866 rt6_flush(gateway, ifp)
 1867         struct in6_addr *gateway;
 1868         struct ifnet *ifp;
 1869 {
 1870         struct radix_node_head *rnh = rt_tables[AF_INET6];
 1871         int s = splnet();
 1872 
 1873         /* We'll care only link-local addresses */
 1874         if (!IN6_IS_ADDR_LINKLOCAL(gateway)) {
 1875                 splx(s);
 1876                 return;
 1877         }
 1878         /* XXX: hack for KAME's link-local address kludge */
 1879         gateway->s6_addr16[1] = htons(ifp->if_index);
 1880 
 1881         RADIX_NODE_HEAD_LOCK(rnh);
 1882         rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
 1883         RADIX_NODE_HEAD_UNLOCK(rnh);
 1884         splx(s);
 1885 }
 1886 
 1887 static int
 1888 rt6_deleteroute(rn, arg)
 1889         struct radix_node *rn;
 1890         void *arg;
 1891 {
 1892 #define SIN6(s) ((struct sockaddr_in6 *)s)
 1893         struct rtentry *rt = (struct rtentry *)rn;
 1894         struct in6_addr *gate = (struct in6_addr *)arg;
 1895 
 1896         if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
 1897                 return (0);
 1898 
 1899         if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) {
 1900                 return (0);
 1901         }
 1902 
 1903         /*
 1904          * Do not delete a static route.
 1905          * XXX: this seems to be a bit ad-hoc. Should we consider the
 1906          * 'cloned' bit instead?
 1907          */
 1908         if ((rt->rt_flags & RTF_STATIC) != 0)
 1909                 return (0);
 1910 
 1911         /*
 1912          * We delete only host route. This means, in particular, we don't
 1913          * delete default route.
 1914          */
 1915         if ((rt->rt_flags & RTF_HOST) == 0)
 1916                 return (0);
 1917 
 1918         return (rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
 1919             rt_mask(rt), rt->rt_flags, 0));
 1920 #undef SIN6
 1921 }
 1922 
 1923 int
 1924 nd6_setdefaultiface(ifindex)
 1925         int ifindex;
 1926 {
 1927         int error = 0;
 1928 
 1929         if (ifindex < 0 || if_index < ifindex)
 1930                 return (EINVAL);
 1931 
 1932         if (nd6_defifindex != ifindex) {
 1933                 nd6_defifindex = ifindex;
 1934                 if (nd6_defifindex > 0)
 1935                         nd6_defifp = ifnet_byindex(nd6_defifindex);
 1936                 else
 1937                         nd6_defifp = NULL;
 1938 
 1939                 /*
 1940                  * If the Default Router List is empty, install a route
 1941                  * to the specified interface as default or remove the default
 1942                  * route when the default interface becomes canceled.
 1943                  * The check for the queue is actually redundant, but
 1944                  * we do this here to avoid re-install the default route
 1945                  * if the list is NOT empty.
 1946                  */
 1947                 if (TAILQ_FIRST(&nd_defrouter) == NULL)
 1948                         defrouter_select();
 1949 
 1950                 /*
 1951                  * Our current implementation assumes one-to-one maping between
 1952                  * interfaces and links, so it would be natural to use the
 1953                  * default interface as the default link.
 1954                  */
 1955                 scope6_setdefault(nd6_defifp);
 1956         }
 1957 
 1958         return (error);
 1959 }

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