The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/nd6_rtr.c

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    1 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: stable/9/sys/netinet6/nd6_rtr.c 281231 2015-04-07 20:20:44Z delphij $");
   34 
   35 #include "opt_inet.h"
   36 #include "opt_inet6.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/malloc.h>
   41 #include <sys/mbuf.h>
   42 #include <sys/socket.h>
   43 #include <sys/sockio.h>
   44 #include <sys/time.h>
   45 #include <sys/kernel.h>
   46 #include <sys/lock.h>
   47 #include <sys/errno.h>
   48 #include <sys/rwlock.h>
   49 #include <sys/syslog.h>
   50 #include <sys/queue.h>
   51 
   52 #include <net/if.h>
   53 #include <net/if_types.h>
   54 #include <net/if_dl.h>
   55 #include <net/route.h>
   56 #include <net/radix.h>
   57 #include <net/vnet.h>
   58 
   59 #include <netinet/in.h>
   60 #include <net/if_llatbl.h>
   61 #include <netinet6/in6_var.h>
   62 #include <netinet6/in6_ifattach.h>
   63 #include <netinet/ip6.h>
   64 #include <netinet6/ip6_var.h>
   65 #include <netinet6/nd6.h>
   66 #include <netinet/icmp6.h>
   67 #include <netinet6/scope6_var.h>
   68 
   69 static int rtpref(struct nd_defrouter *);
   70 static struct nd_defrouter *defrtrlist_update(struct nd_defrouter *);
   71 static int prelist_update(struct nd_prefixctl *, struct nd_defrouter *,
   72     struct mbuf *, int);
   73 static struct in6_ifaddr *in6_ifadd(struct nd_prefixctl *, int);
   74 static struct nd_pfxrouter *pfxrtr_lookup(struct nd_prefix *,
   75         struct nd_defrouter *);
   76 static void pfxrtr_add(struct nd_prefix *, struct nd_defrouter *);
   77 static void pfxrtr_del(struct nd_pfxrouter *);
   78 static struct nd_pfxrouter *find_pfxlist_reachable_router
   79 (struct nd_prefix *);
   80 static void defrouter_delreq(struct nd_defrouter *);
   81 static void nd6_rtmsg(int, struct rtentry *);
   82 
   83 static int in6_init_prefix_ltimes(struct nd_prefix *);
   84 static void in6_init_address_ltimes(struct nd_prefix *,
   85         struct in6_addrlifetime *);
   86 
   87 static int nd6_prefix_onlink(struct nd_prefix *);
   88 static int nd6_prefix_offlink(struct nd_prefix *);
   89 
   90 static int rt6_deleteroute(struct radix_node *, void *);
   91 
   92 VNET_DECLARE(int, nd6_recalc_reachtm_interval);
   93 #define V_nd6_recalc_reachtm_interval   VNET(nd6_recalc_reachtm_interval)
   94 
   95 static VNET_DEFINE(struct ifnet *, nd6_defifp);
   96 VNET_DEFINE(int, nd6_defifindex);
   97 #define V_nd6_defifp                    VNET(nd6_defifp)
   98 
   99 VNET_DEFINE(int, ip6_use_tempaddr) = 0;
  100 
  101 VNET_DEFINE(int, ip6_desync_factor);
  102 VNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime) = DEF_TEMP_PREFERRED_LIFETIME;
  103 VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime) = DEF_TEMP_VALID_LIFETIME;
  104 
  105 VNET_DEFINE(int, ip6_temp_regen_advance) = TEMPADDR_REGEN_ADVANCE;
  106 
  107 /* RTPREF_MEDIUM has to be 0! */
  108 #define RTPREF_HIGH     1
  109 #define RTPREF_MEDIUM   0
  110 #define RTPREF_LOW      (-1)
  111 #define RTPREF_RESERVED (-2)
  112 #define RTPREF_INVALID  (-3)    /* internal */
  113 
  114 /*
  115  * Receive Router Solicitation Message - just for routers.
  116  * Router solicitation/advertisement is mostly managed by userland program
  117  * (rtadvd) so here we have no function like nd6_ra_output().
  118  *
  119  * Based on RFC 2461
  120  */
  121 void
  122 nd6_rs_input(struct mbuf *m, int off, int icmp6len)
  123 {
  124         struct ifnet *ifp = m->m_pkthdr.rcvif;
  125         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  126         struct nd_router_solicit *nd_rs;
  127         struct in6_addr saddr6 = ip6->ip6_src;
  128         char *lladdr = NULL;
  129         int lladdrlen = 0;
  130         union nd_opts ndopts;
  131         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
  132 
  133         /*
  134          * Accept RS only when V_ip6_forwarding=1 and the interface has
  135          * no ND6_IFF_ACCEPT_RTADV.
  136          */
  137         if (!V_ip6_forwarding || ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV)
  138                 goto freeit;
  139 
  140         /* Sanity checks */
  141         if (ip6->ip6_hlim != 255) {
  142                 nd6log((LOG_ERR,
  143                     "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
  144                     ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
  145                     ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
  146                 goto bad;
  147         }
  148 
  149         /*
  150          * Don't update the neighbor cache, if src = ::.
  151          * This indicates that the src has no IP address assigned yet.
  152          */
  153         if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
  154                 goto freeit;
  155 
  156 #ifndef PULLDOWN_TEST
  157         IP6_EXTHDR_CHECK(m, off, icmp6len,);
  158         nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
  159 #else
  160         IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
  161         if (nd_rs == NULL) {
  162                 ICMP6STAT_INC(icp6s_tooshort);
  163                 return;
  164         }
  165 #endif
  166 
  167         icmp6len -= sizeof(*nd_rs);
  168         nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
  169         if (nd6_options(&ndopts) < 0) {
  170                 nd6log((LOG_INFO,
  171                     "nd6_rs_input: invalid ND option, ignored\n"));
  172                 /* nd6_options have incremented stats */
  173                 goto freeit;
  174         }
  175 
  176         if (ndopts.nd_opts_src_lladdr) {
  177                 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
  178                 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
  179         }
  180 
  181         if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
  182                 nd6log((LOG_INFO,
  183                     "nd6_rs_input: lladdrlen mismatch for %s "
  184                     "(if %d, RS packet %d)\n",
  185                     ip6_sprintf(ip6bufs, &saddr6),
  186                     ifp->if_addrlen, lladdrlen - 2));
  187                 goto bad;
  188         }
  189 
  190         nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
  191 
  192  freeit:
  193         m_freem(m);
  194         return;
  195 
  196  bad:
  197         ICMP6STAT_INC(icp6s_badrs);
  198         m_freem(m);
  199 }
  200 
  201 /*
  202  * Receive Router Advertisement Message.
  203  *
  204  * Based on RFC 2461
  205  * TODO: on-link bit on prefix information
  206  * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
  207  */
  208 void
  209 nd6_ra_input(struct mbuf *m, int off, int icmp6len)
  210 {
  211         struct ifnet *ifp = m->m_pkthdr.rcvif;
  212         struct nd_ifinfo *ndi = ND_IFINFO(ifp);
  213         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  214         struct nd_router_advert *nd_ra;
  215         struct in6_addr saddr6 = ip6->ip6_src;
  216         int mcast = 0;
  217         union nd_opts ndopts;
  218         struct nd_defrouter *dr;
  219         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
  220 
  221         /*
  222          * We only accept RAs only when the per-interface flag
  223          * ND6_IFF_ACCEPT_RTADV is on the receiving interface.
  224          */
  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(ip6bufs, &ip6->ip6_src),
  232                     ip6_sprintf(ip6bufd, &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(ip6bufs, &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_INC(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         /* remember if this is a multicasted advertisement */
  268         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
  269                 mcast = 1;
  270 
  271         bzero(&dr0, sizeof(dr0));
  272         dr0.rtaddr = saddr6;
  273         dr0.flags  = nd_ra->nd_ra_flags_reserved;
  274         /*
  275          * Effectively-disable routes from RA messages when
  276          * ND6_IFF_NO_RADR enabled on the receiving interface or
  277          * (ip6.forwarding == 1 && ip6.rfc6204w3 != 1).
  278          */
  279         if (ndi->flags & ND6_IFF_NO_RADR)
  280                 dr0.rtlifetime = 0;
  281         else if (V_ip6_forwarding && !V_ip6_rfc6204w3)
  282                 dr0.rtlifetime = 0;
  283         else
  284                 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
  285         dr0.expire = time_second + dr0.rtlifetime;
  286         dr0.ifp = ifp;
  287         /* unspecified or not? (RFC 2461 6.3.4) */
  288         if (advreachable) {
  289                 advreachable = ntohl(advreachable);
  290                 if (advreachable <= MAX_REACHABLE_TIME &&
  291                     ndi->basereachable != advreachable) {
  292                         ndi->basereachable = advreachable;
  293                         ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
  294                         ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */
  295                 }
  296         }
  297         if (nd_ra->nd_ra_retransmit)
  298                 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
  299         if (nd_ra->nd_ra_curhoplimit) {
  300                 if (ndi->chlim < nd_ra->nd_ra_curhoplimit)
  301                         ndi->chlim = nd_ra->nd_ra_curhoplimit;
  302                 else if (ndi->chlim != nd_ra->nd_ra_curhoplimit) {
  303                         log(LOG_ERR, "RA with a lower CurHopLimit sent from "
  304                             "%s on %s (current = %d, received = %d). "
  305                             "Ignored.\n", ip6_sprintf(ip6bufs, &ip6->ip6_src),
  306                             if_name(ifp), ndi->chlim, nd_ra->nd_ra_curhoplimit);
  307                 }
  308         }
  309         dr = defrtrlist_update(&dr0);
  310     }
  311 
  312         /*
  313          * prefix
  314          */
  315         if (ndopts.nd_opts_pi) {
  316                 struct nd_opt_hdr *pt;
  317                 struct nd_opt_prefix_info *pi = NULL;
  318                 struct nd_prefixctl pr;
  319 
  320                 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
  321                      pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
  322                      pt = (struct nd_opt_hdr *)((caddr_t)pt +
  323                                                 (pt->nd_opt_len << 3))) {
  324                         if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
  325                                 continue;
  326                         pi = (struct nd_opt_prefix_info *)pt;
  327 
  328                         if (pi->nd_opt_pi_len != 4) {
  329                                 nd6log((LOG_INFO,
  330                                     "nd6_ra_input: invalid option "
  331                                     "len %d for prefix information option, "
  332                                     "ignored\n", pi->nd_opt_pi_len));
  333                                 continue;
  334                         }
  335 
  336                         if (128 < pi->nd_opt_pi_prefix_len) {
  337                                 nd6log((LOG_INFO,
  338                                     "nd6_ra_input: invalid prefix "
  339                                     "len %d for prefix information option, "
  340                                     "ignored\n", pi->nd_opt_pi_prefix_len));
  341                                 continue;
  342                         }
  343 
  344                         if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
  345                          || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
  346                                 nd6log((LOG_INFO,
  347                                     "nd6_ra_input: invalid prefix "
  348                                     "%s, ignored\n",
  349                                     ip6_sprintf(ip6bufs,
  350                                         &pi->nd_opt_pi_prefix)));
  351                                 continue;
  352                         }
  353 
  354                         bzero(&pr, sizeof(pr));
  355                         pr.ndpr_prefix.sin6_family = AF_INET6;
  356                         pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
  357                         pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
  358                         pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
  359 
  360                         pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
  361                             ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
  362                         pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
  363                             ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
  364                         pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
  365                         pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
  366                         pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
  367                         (void)prelist_update(&pr, dr, m, mcast);
  368                 }
  369         }
  370 
  371         /*
  372          * MTU
  373          */
  374         if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
  375                 u_long mtu;
  376                 u_long maxmtu;
  377 
  378                 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
  379 
  380                 /* lower bound */
  381                 if (mtu < IPV6_MMTU) {
  382                         nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
  383                             "mtu=%lu sent from %s, ignoring\n",
  384                             mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src)));
  385                         goto skip;
  386                 }
  387 
  388                 /* upper bound */
  389                 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
  390                     ? ndi->maxmtu : ifp->if_mtu;
  391                 if (mtu <= maxmtu) {
  392                         int change = (ndi->linkmtu != mtu);
  393 
  394                         ndi->linkmtu = mtu;
  395                         if (change) /* in6_maxmtu may change */
  396                                 in6_setmaxmtu();
  397                 } else {
  398                         nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
  399                             "mtu=%lu sent from %s; "
  400                             "exceeds maxmtu %lu, ignoring\n",
  401                             mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu));
  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", ip6_sprintf(ip6bufs, &saddr6),
  423                     ifp->if_addrlen, lladdrlen - 2));
  424                 goto bad;
  425         }
  426 
  427         nd6_cache_lladdr(ifp, &saddr6, lladdr,
  428             lladdrlen, ND_ROUTER_ADVERT, 0);
  429 
  430         /*
  431          * Installing a link-layer address might change the state of the
  432          * router's neighbor cache, which might also affect our on-link
  433          * detection of adveritsed prefixes.
  434          */
  435         pfxlist_onlink_check();
  436     }
  437 
  438  freeit:
  439         m_freem(m);
  440         return;
  441 
  442  bad:
  443         ICMP6STAT_INC(icp6s_badra);
  444         m_freem(m);
  445 }
  446 
  447 /*
  448  * default router list proccessing sub routines
  449  */
  450 
  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         struct ifnet *ifp;
  457         struct ifaddr *ifa;
  458 
  459         bzero((caddr_t)&info, sizeof(info));
  460         info.rti_info[RTAX_DST] = rt_key(rt);
  461         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
  462         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
  463         ifp = rt->rt_ifp;
  464         if (ifp != NULL) {
  465                 IF_ADDR_RLOCK(ifp);
  466                 ifa = TAILQ_FIRST(&ifp->if_addrhead);
  467                 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
  468                 ifa_ref(ifa);
  469                 IF_ADDR_RUNLOCK(ifp);
  470                 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
  471         } else
  472                 ifa = NULL;
  473 
  474         rt_missmsg_fib(cmd, &info, rt->rt_flags, 0, rt->rt_fibnum);
  475         if (ifa != NULL)
  476                 ifa_free(ifa);
  477 }
  478 
  479 static void
  480 defrouter_addreq(struct nd_defrouter *new)
  481 {
  482         struct sockaddr_in6 def, mask, gate;
  483         struct rtentry *newrt = NULL;
  484         int s;
  485         int error;
  486 
  487         bzero(&def, sizeof(def));
  488         bzero(&mask, sizeof(mask));
  489         bzero(&gate, sizeof(gate));
  490 
  491         def.sin6_len = mask.sin6_len = gate.sin6_len =
  492             sizeof(struct sockaddr_in6);
  493         def.sin6_family = gate.sin6_family = AF_INET6;
  494         gate.sin6_addr = new->rtaddr;
  495 
  496         s = splnet();
  497         error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&def,
  498             (struct sockaddr *)&gate, (struct sockaddr *)&mask,
  499             RTF_GATEWAY, &newrt, RT_DEFAULT_FIB);
  500         if (newrt) {
  501                 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
  502                 RTFREE(newrt);
  503         }
  504         if (error == 0)
  505                 new->installed = 1;
  506         splx(s);
  507         return;
  508 }
  509 
  510 struct nd_defrouter *
  511 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
  512 {
  513         struct nd_defrouter *dr;
  514 
  515         TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
  516                 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
  517                         return (dr);
  518         }
  519 
  520         return (NULL);          /* search failed */
  521 }
  522 
  523 /*
  524  * Remove the default route for a given router.
  525  * This is just a subroutine function for defrouter_select(), and should
  526  * not be called from anywhere else.
  527  */
  528 static void
  529 defrouter_delreq(struct nd_defrouter *dr)
  530 {
  531         struct sockaddr_in6 def, mask, gate;
  532         struct rtentry *oldrt = NULL;
  533 
  534         bzero(&def, sizeof(def));
  535         bzero(&mask, sizeof(mask));
  536         bzero(&gate, sizeof(gate));
  537 
  538         def.sin6_len = mask.sin6_len = gate.sin6_len =
  539             sizeof(struct sockaddr_in6);
  540         def.sin6_family = gate.sin6_family = AF_INET6;
  541         gate.sin6_addr = dr->rtaddr;
  542 
  543         in6_rtrequest(RTM_DELETE, (struct sockaddr *)&def,
  544             (struct sockaddr *)&gate,
  545             (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt, RT_DEFAULT_FIB);
  546         if (oldrt) {
  547                 nd6_rtmsg(RTM_DELETE, oldrt);
  548                 RTFREE(oldrt);
  549         }
  550 
  551         dr->installed = 0;
  552 }
  553 
  554 /*
  555  * remove all default routes from default router list
  556  */
  557 void
  558 defrouter_reset(void)
  559 {
  560         struct nd_defrouter *dr;
  561 
  562         TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry)
  563                 defrouter_delreq(dr);
  564 
  565         /*
  566          * XXX should we also nuke any default routers in the kernel, by
  567          * going through them by rtalloc1()?
  568          */
  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 (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV)
  582                 rt6_flush(&dr->rtaddr, dr->ifp);
  583 
  584         if (dr->installed) {
  585                 deldr = dr;
  586                 defrouter_delreq(dr);
  587         }
  588         TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
  589 
  590         /*
  591          * Also delete all the pointers to the router in each prefix lists.
  592          */
  593         LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
  594                 struct nd_pfxrouter *pfxrtr;
  595                 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
  596                         pfxrtr_del(pfxrtr);
  597         }
  598         pfxlist_onlink_check();
  599 
  600         /*
  601          * If the router is the primary one, choose a new one.
  602          * Note that defrouter_select() will remove the current gateway
  603          * from the routing table.
  604          */
  605         if (deldr)
  606                 defrouter_select();
  607 
  608         free(dr, M_IP6NDP);
  609 }
  610 
  611 /*
  612  * Default Router Selection according to Section 6.3.6 of RFC 2461 and
  613  * draft-ietf-ipngwg-router-selection:
  614  * 1) Routers that are reachable or probably reachable should be preferred.
  615  *    If we have more than one (probably) reachable router, prefer ones
  616  *    with the highest router preference.
  617  * 2) When no routers on the list are known to be reachable or
  618  *    probably reachable, routers SHOULD be selected in a round-robin
  619  *    fashion, regardless of router preference values.
  620  * 3) If the Default Router List is empty, assume that all
  621  *    destinations are on-link.
  622  *
  623  * We assume nd_defrouter is sorted by router preference value.
  624  * Since the code below covers both with and without router preference cases,
  625  * we do not need to classify the cases by ifdef.
  626  *
  627  * At this moment, we do not try to install more than one default router,
  628  * even when the multipath routing is available, because we're not sure about
  629  * the benefits for stub hosts comparing to the risk of making the code
  630  * complicated and the possibility of introducing bugs.
  631  */
  632 void
  633 defrouter_select(void)
  634 {
  635         int s = splnet();
  636         struct nd_defrouter *dr, *selected_dr = NULL, *installed_dr = NULL;
  637         struct llentry *ln = NULL;
  638 
  639         /*
  640          * Let's handle easy case (3) first:
  641          * If default router list is empty, there's nothing to be done.
  642          */
  643         if (TAILQ_EMPTY(&V_nd_defrouter)) {
  644                 splx(s);
  645                 return;
  646         }
  647 
  648         /*
  649          * Search for a (probably) reachable router from the list.
  650          * We just pick up the first reachable one (if any), assuming that
  651          * the ordering rule of the list described in defrtrlist_update().
  652          */
  653         TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
  654                 IF_AFDATA_RLOCK(dr->ifp);
  655                 if (selected_dr == NULL &&
  656                     (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
  657                     ND6_IS_LLINFO_PROBREACH(ln)) {
  658                         selected_dr = dr;
  659                 }
  660                 IF_AFDATA_RUNLOCK(dr->ifp);
  661                 if (ln != NULL) {
  662                         LLE_RUNLOCK(ln);
  663                         ln = NULL;
  664                 }
  665 
  666                 if (dr->installed && installed_dr == NULL)
  667                         installed_dr = dr;
  668                 else if (dr->installed && installed_dr) {
  669                         /* this should not happen.  warn for diagnosis. */
  670                         log(LOG_ERR, "defrouter_select: more than one router"
  671                             " is installed\n");
  672                 }
  673         }
  674         /*
  675          * If none of the default routers was found to be reachable,
  676          * round-robin the list regardless of preference.
  677          * Otherwise, if we have an installed router, check if the selected
  678          * (reachable) router should really be preferred to the installed one.
  679          * We only prefer the new router when the old one is not reachable
  680          * or when the new one has a really higher preference value.
  681          */
  682         if (selected_dr == NULL) {
  683                 if (installed_dr == NULL || !TAILQ_NEXT(installed_dr, dr_entry))
  684                         selected_dr = TAILQ_FIRST(&V_nd_defrouter);
  685                 else
  686                         selected_dr = TAILQ_NEXT(installed_dr, dr_entry);
  687         } else if (installed_dr) {
  688                 IF_AFDATA_RLOCK(installed_dr->ifp);
  689                 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0, installed_dr->ifp)) &&
  690                     ND6_IS_LLINFO_PROBREACH(ln) &&
  691                     rtpref(selected_dr) <= rtpref(installed_dr)) {
  692                         selected_dr = installed_dr;
  693                 }
  694                 IF_AFDATA_RUNLOCK(installed_dr->ifp);
  695                 if (ln != NULL)
  696                         LLE_RUNLOCK(ln);
  697         }
  698 
  699         /*
  700          * If the selected router is different than the installed one,
  701          * remove the installed router and install the selected one.
  702          * Note that the selected router is never NULL here.
  703          */
  704         if (installed_dr != selected_dr) {
  705                 if (installed_dr)
  706                         defrouter_delreq(installed_dr);
  707                 defrouter_addreq(selected_dr);
  708         }
  709 
  710         splx(s);
  711         return;
  712 }
  713 
  714 /*
  715  * for default router selection
  716  * regards router-preference field as a 2-bit signed integer
  717  */
  718 static int
  719 rtpref(struct nd_defrouter *dr)
  720 {
  721         switch (dr->flags & ND_RA_FLAG_RTPREF_MASK) {
  722         case ND_RA_FLAG_RTPREF_HIGH:
  723                 return (RTPREF_HIGH);
  724         case ND_RA_FLAG_RTPREF_MEDIUM:
  725         case ND_RA_FLAG_RTPREF_RSV:
  726                 return (RTPREF_MEDIUM);
  727         case ND_RA_FLAG_RTPREF_LOW:
  728                 return (RTPREF_LOW);
  729         default:
  730                 /*
  731                  * This case should never happen.  If it did, it would mean a
  732                  * serious bug of kernel internal.  We thus always bark here.
  733                  * Or, can we even panic?
  734                  */
  735                 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->flags);
  736                 return (RTPREF_INVALID);
  737         }
  738         /* NOTREACHED */
  739 }
  740 
  741 static struct nd_defrouter *
  742 defrtrlist_update(struct nd_defrouter *new)
  743 {
  744         struct nd_defrouter *dr, *n;
  745         int s = splnet();
  746 
  747         if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
  748                 /* entry exists */
  749                 if (new->rtlifetime == 0) {
  750                         defrtrlist_del(dr);
  751                         dr = NULL;
  752                 } else {
  753                         int oldpref = rtpref(dr);
  754 
  755                         /* override */
  756                         dr->flags = new->flags; /* xxx flag check */
  757                         dr->rtlifetime = new->rtlifetime;
  758                         dr->expire = new->expire;
  759 
  760                         /*
  761                          * If the preference does not change, there's no need
  762                          * to sort the entries. Also make sure the selected
  763                          * router is still installed in the kernel.
  764                          */
  765                         if (dr->installed && rtpref(new) == oldpref) {
  766                                 splx(s);
  767                                 return (dr);
  768                         }
  769 
  770                         /*
  771                          * preferred router may be changed, so relocate
  772                          * this router.
  773                          * XXX: calling TAILQ_REMOVE directly is a bad manner.
  774                          * However, since defrtrlist_del() has many side
  775                          * effects, we intentionally do so here.
  776                          * defrouter_select() below will handle routing
  777                          * changes later.
  778                          */
  779                         TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
  780                         n = dr;
  781                         goto insert;
  782                 }
  783                 splx(s);
  784                 return (dr);
  785         }
  786 
  787         /* entry does not exist */
  788         if (new->rtlifetime == 0) {
  789                 splx(s);
  790                 return (NULL);
  791         }
  792 
  793         n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
  794         if (n == NULL) {
  795                 splx(s);
  796                 return (NULL);
  797         }
  798         bzero(n, sizeof(*n));
  799         *n = *new;
  800 
  801 insert:
  802         /*
  803          * Insert the new router in the Default Router List;
  804          * The Default Router List should be in the descending order
  805          * of router-preferece.  Routers with the same preference are
  806          * sorted in the arriving time order.
  807          */
  808 
  809         /* insert at the end of the group */
  810         TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
  811                 if (rtpref(n) > rtpref(dr))
  812                         break;
  813         }
  814         if (dr)
  815                 TAILQ_INSERT_BEFORE(dr, n, dr_entry);
  816         else
  817                 TAILQ_INSERT_TAIL(&V_nd_defrouter, n, dr_entry);
  818 
  819         defrouter_select();
  820 
  821         splx(s);
  822 
  823         return (n);
  824 }
  825 
  826 static struct nd_pfxrouter *
  827 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
  828 {
  829         struct nd_pfxrouter *search;
  830 
  831         LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) {
  832                 if (search->router == dr)
  833                         break;
  834         }
  835 
  836         return (search);
  837 }
  838 
  839 static void
  840 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
  841 {
  842         struct nd_pfxrouter *new;
  843 
  844         new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
  845         if (new == NULL)
  846                 return;
  847         bzero(new, sizeof(*new));
  848         new->router = dr;
  849 
  850         LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
  851 
  852         pfxlist_onlink_check();
  853 }
  854 
  855 static void
  856 pfxrtr_del(struct nd_pfxrouter *pfr)
  857 {
  858         LIST_REMOVE(pfr, pfr_entry);
  859         free(pfr, M_IP6NDP);
  860 }
  861 
  862 struct nd_prefix *
  863 nd6_prefix_lookup(struct nd_prefixctl *key)
  864 {
  865         struct nd_prefix *search;
  866 
  867         LIST_FOREACH(search, &V_nd_prefix, ndpr_entry) {
  868                 if (key->ndpr_ifp == search->ndpr_ifp &&
  869                     key->ndpr_plen == search->ndpr_plen &&
  870                     in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr,
  871                     &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) {
  872                         break;
  873                 }
  874         }
  875 
  876         return (search);
  877 }
  878 
  879 int
  880 nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr,
  881     struct nd_prefix **newp)
  882 {
  883         struct nd_prefix *new = NULL;
  884         int error = 0;
  885         int i, s;
  886         char ip6buf[INET6_ADDRSTRLEN];
  887 
  888         new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
  889         if (new == NULL)
  890                 return(ENOMEM);
  891         bzero(new, sizeof(*new));
  892         new->ndpr_ifp = pr->ndpr_ifp;
  893         new->ndpr_prefix = pr->ndpr_prefix;
  894         new->ndpr_plen = pr->ndpr_plen;
  895         new->ndpr_vltime = pr->ndpr_vltime;
  896         new->ndpr_pltime = pr->ndpr_pltime;
  897         new->ndpr_flags = pr->ndpr_flags;
  898         if ((error = in6_init_prefix_ltimes(new)) != 0) {
  899                 free(new, M_IP6NDP);
  900                 return(error);
  901         }
  902         new->ndpr_lastupdate = time_second;
  903         if (newp != NULL)
  904                 *newp = new;
  905 
  906         /* initialization */
  907         LIST_INIT(&new->ndpr_advrtrs);
  908         in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
  909         /* make prefix in the canonical form */
  910         for (i = 0; i < 4; i++)
  911                 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
  912                     new->ndpr_mask.s6_addr32[i];
  913 
  914         s = splnet();
  915         /* link ndpr_entry to nd_prefix list */
  916         LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry);
  917         splx(s);
  918 
  919         /* ND_OPT_PI_FLAG_ONLINK processing */
  920         if (new->ndpr_raf_onlink) {
  921                 int e;
  922 
  923                 if ((e = nd6_prefix_onlink(new)) != 0) {
  924                         nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
  925                             "the prefix %s/%d on-link on %s (errno=%d)\n",
  926                             ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
  927                             pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  928                         /* proceed anyway. XXX: is it correct? */
  929                 }
  930         }
  931 
  932         if (dr)
  933                 pfxrtr_add(new, dr);
  934 
  935         return 0;
  936 }
  937 
  938 void
  939 prelist_remove(struct nd_prefix *pr)
  940 {
  941         struct nd_pfxrouter *pfr, *next;
  942         int e, s;
  943         char ip6buf[INET6_ADDRSTRLEN];
  944 
  945         /* make sure to invalidate the prefix until it is really freed. */
  946         pr->ndpr_vltime = 0;
  947         pr->ndpr_pltime = 0;
  948 
  949         /*
  950          * Though these flags are now meaningless, we'd rather keep the value
  951          * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users
  952          * when executing "ndp -p".
  953          */
  954 
  955         if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
  956             (e = nd6_prefix_offlink(pr)) != 0) {
  957                 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
  958                     "on %s, errno=%d\n",
  959                     ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
  960                     pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  961                 /* what should we do? */
  962         }
  963 
  964         if (pr->ndpr_refcnt > 0)
  965                 return;         /* notice here? */
  966 
  967         s = splnet();
  968 
  969         /* unlink ndpr_entry from nd_prefix list */
  970         LIST_REMOVE(pr, ndpr_entry);
  971 
  972         /* free list of routers that adversed the prefix */
  973         LIST_FOREACH_SAFE(pfr, &pr->ndpr_advrtrs, pfr_entry, next) {
  974                 free(pfr, M_IP6NDP);
  975         }
  976         splx(s);
  977 
  978         free(pr, M_IP6NDP);
  979 
  980         pfxlist_onlink_check();
  981 }
  982 
  983 /*
  984  * dr - may be NULL
  985  */
  986 
  987 static int
  988 prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
  989     struct mbuf *m, int mcast)
  990 {
  991         struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
  992         struct ifaddr *ifa;
  993         struct ifnet *ifp = new->ndpr_ifp;
  994         struct nd_prefix *pr;
  995         int s = splnet();
  996         int error = 0;
  997         int newprefix = 0;
  998         int auth;
  999         struct in6_addrlifetime lt6_tmp;
 1000         char ip6buf[INET6_ADDRSTRLEN];
 1001 
 1002         auth = 0;
 1003         if (m) {
 1004                 /*
 1005                  * Authenticity for NA consists authentication for
 1006                  * both IP header and IP datagrams, doesn't it ?
 1007                  */
 1008 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
 1009                 auth = ((m->m_flags & M_AUTHIPHDR) &&
 1010                     (m->m_flags & M_AUTHIPDGM));
 1011 #endif
 1012         }
 1013 
 1014         if ((pr = nd6_prefix_lookup(new)) != NULL) {
 1015                 /*
 1016                  * nd6_prefix_lookup() ensures that pr and new have the same
 1017                  * prefix on a same interface.
 1018                  */
 1019 
 1020                 /*
 1021                  * Update prefix information.  Note that the on-link (L) bit
 1022                  * and the autonomous (A) bit should NOT be changed from 1
 1023                  * to 0.
 1024                  */
 1025                 if (new->ndpr_raf_onlink == 1)
 1026                         pr->ndpr_raf_onlink = 1;
 1027                 if (new->ndpr_raf_auto == 1)
 1028                         pr->ndpr_raf_auto = 1;
 1029                 if (new->ndpr_raf_onlink) {
 1030                         pr->ndpr_vltime = new->ndpr_vltime;
 1031                         pr->ndpr_pltime = new->ndpr_pltime;
 1032                         (void)in6_init_prefix_ltimes(pr); /* XXX error case? */
 1033                         pr->ndpr_lastupdate = time_second;
 1034                 }
 1035 
 1036                 if (new->ndpr_raf_onlink &&
 1037                     (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
 1038                         int e;
 1039 
 1040                         if ((e = nd6_prefix_onlink(pr)) != 0) {
 1041                                 nd6log((LOG_ERR,
 1042                                     "prelist_update: failed to make "
 1043                                     "the prefix %s/%d on-link on %s "
 1044                                     "(errno=%d)\n",
 1045                                     ip6_sprintf(ip6buf,
 1046                                             &pr->ndpr_prefix.sin6_addr),
 1047                                     pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
 1048                                 /* proceed anyway. XXX: is it correct? */
 1049                         }
 1050                 }
 1051 
 1052                 if (dr && pfxrtr_lookup(pr, dr) == NULL)
 1053                         pfxrtr_add(pr, dr);
 1054         } else {
 1055                 struct nd_prefix *newpr = NULL;
 1056 
 1057                 newprefix = 1;
 1058 
 1059                 if (new->ndpr_vltime == 0)
 1060                         goto end;
 1061                 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
 1062                         goto end;
 1063 
 1064                 error = nd6_prelist_add(new, dr, &newpr);
 1065                 if (error != 0 || newpr == NULL) {
 1066                         nd6log((LOG_NOTICE, "prelist_update: "
 1067                             "nd6_prelist_add failed for %s/%d on %s "
 1068                             "errno=%d, returnpr=%p\n",
 1069                             ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr),
 1070                             new->ndpr_plen, if_name(new->ndpr_ifp),
 1071                             error, newpr));
 1072                         goto end; /* we should just give up in this case. */
 1073                 }
 1074 
 1075                 /*
 1076                  * XXX: from the ND point of view, we can ignore a prefix
 1077                  * with the on-link bit being zero.  However, we need a
 1078                  * prefix structure for references from autoconfigured
 1079                  * addresses.  Thus, we explicitly make sure that the prefix
 1080                  * itself expires now.
 1081                  */
 1082                 if (newpr->ndpr_raf_onlink == 0) {
 1083                         newpr->ndpr_vltime = 0;
 1084                         newpr->ndpr_pltime = 0;
 1085                         in6_init_prefix_ltimes(newpr);
 1086                 }
 1087 
 1088                 pr = newpr;
 1089         }
 1090 
 1091         /*
 1092          * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
 1093          * Note that pr must be non NULL at this point.
 1094          */
 1095 
 1096         /* 5.5.3 (a). Ignore the prefix without the A bit set. */
 1097         if (!new->ndpr_raf_auto)
 1098                 goto end;
 1099 
 1100         /*
 1101          * 5.5.3 (b). the link-local prefix should have been ignored in
 1102          * nd6_ra_input.
 1103          */
 1104 
 1105         /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */
 1106         if (new->ndpr_pltime > new->ndpr_vltime) {
 1107                 error = EINVAL; /* XXX: won't be used */
 1108                 goto end;
 1109         }
 1110 
 1111         /*
 1112          * 5.5.3 (d).  If the prefix advertised is not equal to the prefix of
 1113          * an address configured by stateless autoconfiguration already in the
 1114          * list of addresses associated with the interface, and the Valid
 1115          * Lifetime is not 0, form an address.  We first check if we have
 1116          * a matching prefix.
 1117          * Note: we apply a clarification in rfc2462bis-02 here.  We only
 1118          * consider autoconfigured addresses while RFC2462 simply said
 1119          * "address".
 1120          */
 1121         IF_ADDR_RLOCK(ifp);
 1122         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1123                 struct in6_ifaddr *ifa6;
 1124                 u_int32_t remaininglifetime;
 1125 
 1126                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1127                         continue;
 1128 
 1129                 ifa6 = (struct in6_ifaddr *)ifa;
 1130 
 1131                 /*
 1132                  * We only consider autoconfigured addresses as per rfc2462bis.
 1133                  */
 1134                 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
 1135                         continue;
 1136 
 1137                 /*
 1138                  * Spec is not clear here, but I believe we should concentrate
 1139                  * on unicast (i.e. not anycast) addresses.
 1140                  * XXX: other ia6_flags? detached or duplicated?
 1141                  */
 1142                 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
 1143                         continue;
 1144 
 1145                 /*
 1146                  * Ignore the address if it is not associated with a prefix
 1147                  * or is associated with a prefix that is different from this
 1148                  * one.  (pr is never NULL here)
 1149                  */
 1150                 if (ifa6->ia6_ndpr != pr)
 1151                         continue;
 1152 
 1153                 if (ia6_match == NULL) /* remember the first one */
 1154                         ia6_match = ifa6;
 1155 
 1156                 /*
 1157                  * An already autoconfigured address matched.  Now that we
 1158                  * are sure there is at least one matched address, we can
 1159                  * proceed to 5.5.3. (e): update the lifetimes according to the
 1160                  * "two hours" rule and the privacy extension.
 1161                  * We apply some clarifications in rfc2462bis:
 1162                  * - use remaininglifetime instead of storedlifetime as a
 1163                  *   variable name
 1164                  * - remove the dead code in the "two-hour" rule
 1165                  */
 1166 #define TWOHOUR         (120*60)
 1167                 lt6_tmp = ifa6->ia6_lifetime;
 1168 
 1169                 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
 1170                         remaininglifetime = ND6_INFINITE_LIFETIME;
 1171                 else if (time_second - ifa6->ia6_updatetime >
 1172                          lt6_tmp.ia6t_vltime) {
 1173                         /*
 1174                          * The case of "invalid" address.  We should usually
 1175                          * not see this case.
 1176                          */
 1177                         remaininglifetime = 0;
 1178                 } else
 1179                         remaininglifetime = lt6_tmp.ia6t_vltime -
 1180                             (time_second - ifa6->ia6_updatetime);
 1181 
 1182                 /* when not updating, keep the current stored lifetime. */
 1183                 lt6_tmp.ia6t_vltime = remaininglifetime;
 1184 
 1185                 if (TWOHOUR < new->ndpr_vltime ||
 1186                     remaininglifetime < new->ndpr_vltime) {
 1187                         lt6_tmp.ia6t_vltime = new->ndpr_vltime;
 1188                 } else if (remaininglifetime <= TWOHOUR) {
 1189                         if (auth) {
 1190                                 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
 1191                         }
 1192                 } else {
 1193                         /*
 1194                          * new->ndpr_vltime <= TWOHOUR &&
 1195                          * TWOHOUR < remaininglifetime
 1196                          */
 1197                         lt6_tmp.ia6t_vltime = TWOHOUR;
 1198                 }
 1199 
 1200                 /* The 2 hour rule is not imposed for preferred lifetime. */
 1201                 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
 1202 
 1203                 in6_init_address_ltimes(pr, &lt6_tmp);
 1204 
 1205                 /*
 1206                  * We need to treat lifetimes for temporary addresses
 1207                  * differently, according to
 1208                  * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
 1209                  * we only update the lifetimes when they are in the maximum
 1210                  * intervals.
 1211                  */
 1212                 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
 1213                         u_int32_t maxvltime, maxpltime;
 1214 
 1215                         if (V_ip6_temp_valid_lifetime >
 1216                             (u_int32_t)((time_second - ifa6->ia6_createtime) +
 1217                             V_ip6_desync_factor)) {
 1218                                 maxvltime = V_ip6_temp_valid_lifetime -
 1219                                     (time_second - ifa6->ia6_createtime) -
 1220                                     V_ip6_desync_factor;
 1221                         } else
 1222                                 maxvltime = 0;
 1223                         if (V_ip6_temp_preferred_lifetime >
 1224                             (u_int32_t)((time_second - ifa6->ia6_createtime) +
 1225                             V_ip6_desync_factor)) {
 1226                                 maxpltime = V_ip6_temp_preferred_lifetime -
 1227                                     (time_second - ifa6->ia6_createtime) -
 1228                                     V_ip6_desync_factor;
 1229                         } else
 1230                                 maxpltime = 0;
 1231 
 1232                         if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
 1233                             lt6_tmp.ia6t_vltime > maxvltime) {
 1234                                 lt6_tmp.ia6t_vltime = maxvltime;
 1235                         }
 1236                         if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
 1237                             lt6_tmp.ia6t_pltime > maxpltime) {
 1238                                 lt6_tmp.ia6t_pltime = maxpltime;
 1239                         }
 1240                 }
 1241                 ifa6->ia6_lifetime = lt6_tmp;
 1242                 ifa6->ia6_updatetime = time_second;
 1243         }
 1244         IF_ADDR_RUNLOCK(ifp);
 1245         if (ia6_match == NULL && new->ndpr_vltime) {
 1246                 int ifidlen;
 1247 
 1248                 /*
 1249                  * 5.5.3 (d) (continued)
 1250                  * No address matched and the valid lifetime is non-zero.
 1251                  * Create a new address.
 1252                  */
 1253 
 1254                 /*
 1255                  * Prefix Length check:
 1256                  * If the sum of the prefix length and interface identifier
 1257                  * length does not equal 128 bits, the Prefix Information
 1258                  * option MUST be ignored.  The length of the interface
 1259                  * identifier is defined in a separate link-type specific
 1260                  * document.
 1261                  */
 1262                 ifidlen = in6_if2idlen(ifp);
 1263                 if (ifidlen < 0) {
 1264                         /* this should not happen, so we always log it. */
 1265                         log(LOG_ERR, "prelist_update: IFID undefined (%s)\n",
 1266                             if_name(ifp));
 1267                         goto end;
 1268                 }
 1269                 if (ifidlen + pr->ndpr_plen != 128) {
 1270                         nd6log((LOG_INFO,
 1271                             "prelist_update: invalid prefixlen "
 1272                             "%d for %s, ignored\n",
 1273                             pr->ndpr_plen, if_name(ifp)));
 1274                         goto end;
 1275                 }
 1276 
 1277                 if ((ia6 = in6_ifadd(new, mcast)) != NULL) {
 1278                         /*
 1279                          * note that we should use pr (not new) for reference.
 1280                          */
 1281                         pr->ndpr_refcnt++;
 1282                         ia6->ia6_ndpr = pr;
 1283 
 1284                         /*
 1285                          * RFC 3041 3.3 (2).
 1286                          * When a new public address is created as described
 1287                          * in RFC2462, also create a new temporary address.
 1288                          *
 1289                          * RFC 3041 3.5.
 1290                          * When an interface connects to a new link, a new
 1291                          * randomized interface identifier should be generated
 1292                          * immediately together with a new set of temporary
 1293                          * addresses.  Thus, we specifiy 1 as the 2nd arg of
 1294                          * in6_tmpifadd().
 1295                          */
 1296                         if (V_ip6_use_tempaddr) {
 1297                                 int e;
 1298                                 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
 1299                                         nd6log((LOG_NOTICE, "prelist_update: "
 1300                                             "failed to create a temporary "
 1301                                             "address, errno=%d\n",
 1302                                             e));
 1303                                 }
 1304                         }
 1305                         ifa_free(&ia6->ia_ifa);
 1306 
 1307                         /*
 1308                          * A newly added address might affect the status
 1309                          * of other addresses, so we check and update it.
 1310                          * XXX: what if address duplication happens?
 1311                          */
 1312                         pfxlist_onlink_check();
 1313                 } else {
 1314                         /* just set an error. do not bark here. */
 1315                         error = EADDRNOTAVAIL; /* XXX: might be unused. */
 1316                 }
 1317         }
 1318 
 1319  end:
 1320         splx(s);
 1321         return error;
 1322 }
 1323 
 1324 /*
 1325  * A supplement function used in the on-link detection below;
 1326  * detect if a given prefix has a (probably) reachable advertising router.
 1327  * XXX: lengthy function name...
 1328  */
 1329 static struct nd_pfxrouter *
 1330 find_pfxlist_reachable_router(struct nd_prefix *pr)
 1331 {
 1332         struct nd_pfxrouter *pfxrtr;
 1333         struct llentry *ln;
 1334         int canreach;
 1335 
 1336         LIST_FOREACH(pfxrtr, &pr->ndpr_advrtrs, pfr_entry) {
 1337                 IF_AFDATA_RLOCK(pfxrtr->router->ifp);
 1338                 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
 1339                 IF_AFDATA_RUNLOCK(pfxrtr->router->ifp);
 1340                 if (ln == NULL)
 1341                         continue;
 1342                 canreach = ND6_IS_LLINFO_PROBREACH(ln);
 1343                 LLE_RUNLOCK(ln);
 1344                 if (canreach)
 1345                         break;
 1346         }
 1347         return (pfxrtr);
 1348 }
 1349 
 1350 /*
 1351  * Check if each prefix in the prefix list has at least one available router
 1352  * that advertised the prefix (a router is "available" if its neighbor cache
 1353  * entry is reachable or probably reachable).
 1354  * If the check fails, the prefix may be off-link, because, for example,
 1355  * we have moved from the network but the lifetime of the prefix has not
 1356  * expired yet.  So we should not use the prefix if there is another prefix
 1357  * that has an available router.
 1358  * But, if there is no prefix that has an available router, we still regards
 1359  * all the prefixes as on-link.  This is because we can't tell if all the
 1360  * routers are simply dead or if we really moved from the network and there
 1361  * is no router around us.
 1362  */
 1363 void
 1364 pfxlist_onlink_check()
 1365 {
 1366         struct nd_prefix *pr;
 1367         struct in6_ifaddr *ifa;
 1368         struct nd_defrouter *dr;
 1369         struct nd_pfxrouter *pfxrtr = NULL;
 1370 
 1371         /*
 1372          * Check if there is a prefix that has a reachable advertising
 1373          * router.
 1374          */
 1375         LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
 1376                 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
 1377                         break;
 1378         }
 1379 
 1380         /*
 1381          * If we have no such prefix, check whether we still have a router
 1382          * that does not advertise any prefixes.
 1383          */
 1384         if (pr == NULL) {
 1385                 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
 1386                         struct nd_prefix *pr0;
 1387 
 1388                         LIST_FOREACH(pr0, &V_nd_prefix, ndpr_entry) {
 1389                                 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
 1390                                         break;
 1391                         }
 1392                         if (pfxrtr != NULL)
 1393                                 break;
 1394                 }
 1395         }
 1396         if (pr != NULL || (!TAILQ_EMPTY(&V_nd_defrouter) && pfxrtr == NULL)) {
 1397                 /*
 1398                  * There is at least one prefix that has a reachable router,
 1399                  * or at least a router which probably does not advertise
 1400                  * any prefixes.  The latter would be the case when we move
 1401                  * to a new link where we have a router that does not provide
 1402                  * prefixes and we configure an address by hand.
 1403                  * Detach prefixes which have no reachable advertising
 1404                  * router, and attach other prefixes.
 1405                  */
 1406                 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
 1407                         /* XXX: a link-local prefix should never be detached */
 1408                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1409                                 continue;
 1410 
 1411                         /*
 1412                          * we aren't interested in prefixes without the L bit
 1413                          * set.
 1414                          */
 1415                         if (pr->ndpr_raf_onlink == 0)
 1416                                 continue;
 1417 
 1418                         if (pr->ndpr_raf_auto == 0)
 1419                                 continue;
 1420 
 1421                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
 1422                             find_pfxlist_reachable_router(pr) == NULL)
 1423                                 pr->ndpr_stateflags |= NDPRF_DETACHED;
 1424                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
 1425                             find_pfxlist_reachable_router(pr) != 0)
 1426                                 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
 1427                 }
 1428         } else {
 1429                 /* there is no prefix that has a reachable router */
 1430                 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
 1431                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1432                                 continue;
 1433 
 1434                         if (pr->ndpr_raf_onlink == 0)
 1435                                 continue;
 1436 
 1437                         if (pr->ndpr_raf_auto == 0)
 1438                                 continue;
 1439 
 1440                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
 1441                                 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
 1442                 }
 1443         }
 1444 
 1445         /*
 1446          * Remove each interface route associated with a (just) detached
 1447          * prefix, and reinstall the interface route for a (just) attached
 1448          * prefix.  Note that all attempt of reinstallation does not
 1449          * necessarily success, when a same prefix is shared among multiple
 1450          * interfaces.  Such cases will be handled in nd6_prefix_onlink,
 1451          * so we don't have to care about them.
 1452          */
 1453         LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
 1454                 int e;
 1455                 char ip6buf[INET6_ADDRSTRLEN];
 1456 
 1457                 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1458                         continue;
 1459 
 1460                 if (pr->ndpr_raf_onlink == 0)
 1461                         continue;
 1462 
 1463                 if (pr->ndpr_raf_auto == 0)
 1464                         continue;
 1465 
 1466                 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
 1467                     (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
 1468                         if ((e = nd6_prefix_offlink(pr)) != 0) {
 1469                                 nd6log((LOG_ERR,
 1470                                     "pfxlist_onlink_check: failed to "
 1471                                     "make %s/%d offlink, errno=%d\n",
 1472                                     ip6_sprintf(ip6buf,
 1473                                             &pr->ndpr_prefix.sin6_addr),
 1474                                             pr->ndpr_plen, e));
 1475                         }
 1476                 }
 1477                 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
 1478                     (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
 1479                     pr->ndpr_raf_onlink) {
 1480                         if ((e = nd6_prefix_onlink(pr)) != 0) {
 1481                                 nd6log((LOG_ERR,
 1482                                     "pfxlist_onlink_check: failed to "
 1483                                     "make %s/%d onlink, errno=%d\n",
 1484                                     ip6_sprintf(ip6buf,
 1485                                             &pr->ndpr_prefix.sin6_addr),
 1486                                             pr->ndpr_plen, e));
 1487                         }
 1488                 }
 1489         }
 1490 
 1491         /*
 1492          * Changes on the prefix status might affect address status as well.
 1493          * Make sure that all addresses derived from an attached prefix are
 1494          * attached, and that all addresses derived from a detached prefix are
 1495          * detached.  Note, however, that a manually configured address should
 1496          * always be attached.
 1497          * The precise detection logic is same as the one for prefixes.
 1498          *
 1499          * XXXRW: in6_ifaddrhead locking.
 1500          */
 1501         TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
 1502                 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
 1503                         continue;
 1504 
 1505                 if (ifa->ia6_ndpr == NULL) {
 1506                         /*
 1507                          * This can happen when we first configure the address
 1508                          * (i.e. the address exists, but the prefix does not).
 1509                          * XXX: complicated relationships...
 1510                          */
 1511                         continue;
 1512                 }
 1513 
 1514                 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
 1515                         break;
 1516         }
 1517         if (ifa) {
 1518                 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
 1519                         if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1520                                 continue;
 1521 
 1522                         if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
 1523                                 continue;
 1524 
 1525                         if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) {
 1526                                 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
 1527                                         ifa->ia6_flags &= ~IN6_IFF_DETACHED;
 1528                                         ifa->ia6_flags |= IN6_IFF_TENTATIVE;
 1529                                         nd6_dad_start((struct ifaddr *)ifa, 0);
 1530                                 }
 1531                         } else {
 1532                                 ifa->ia6_flags |= IN6_IFF_DETACHED;
 1533                         }
 1534                 }
 1535         }
 1536         else {
 1537                 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
 1538                         if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1539                                 continue;
 1540 
 1541                         if (ifa->ia6_flags & IN6_IFF_DETACHED) {
 1542                                 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
 1543                                 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
 1544                                 /* Do we need a delay in this case? */
 1545                                 nd6_dad_start((struct ifaddr *)ifa, 0);
 1546                         }
 1547                 }
 1548         }
 1549 }
 1550 
 1551 static int
 1552 nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa)
 1553 {
 1554         static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
 1555         struct radix_node_head *rnh;
 1556         struct rtentry *rt;
 1557         struct sockaddr_in6 mask6;
 1558         u_long rtflags;
 1559         int error, a_failure, fibnum;
 1560 
 1561         /*
 1562          * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
 1563          * ifa->ifa_rtrequest = nd6_rtrequest;
 1564          */
 1565         bzero(&mask6, sizeof(mask6));
 1566         mask6.sin6_len = sizeof(mask6);
 1567         mask6.sin6_addr = pr->ndpr_mask;
 1568         rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP;
 1569 
 1570         a_failure = 0;
 1571         for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
 1572 
 1573                 rt = NULL;
 1574                 error = in6_rtrequest(RTM_ADD,
 1575                     (struct sockaddr *)&pr->ndpr_prefix, ifa->ifa_addr,
 1576                     (struct sockaddr *)&mask6, rtflags, &rt, fibnum);
 1577                 if (error == 0) {
 1578                         KASSERT(rt != NULL, ("%s: in6_rtrequest return no "
 1579                             "error(%d) but rt is NULL, pr=%p, ifa=%p", __func__,
 1580                             error, pr, ifa));
 1581 
 1582                         rnh = rt_tables_get_rnh(rt->rt_fibnum, AF_INET6);
 1583                         /* XXX what if rhn == NULL? */
 1584                         RADIX_NODE_HEAD_LOCK(rnh);
 1585                         RT_LOCK(rt);
 1586                         if (rt_setgate(rt, rt_key(rt),
 1587                             (struct sockaddr *)&null_sdl) == 0) {
 1588                                 struct sockaddr_dl *dl;
 1589 
 1590                                 dl = (struct sockaddr_dl *)rt->rt_gateway;
 1591                                 dl->sdl_type = rt->rt_ifp->if_type;
 1592                                 dl->sdl_index = rt->rt_ifp->if_index;
 1593                         }
 1594                         RADIX_NODE_HEAD_UNLOCK(rnh);
 1595                         nd6_rtmsg(RTM_ADD, rt);
 1596                         RT_UNLOCK(rt);
 1597                         pr->ndpr_stateflags |= NDPRF_ONLINK;
 1598                 } else {
 1599                         char ip6buf[INET6_ADDRSTRLEN];
 1600                         char ip6bufg[INET6_ADDRSTRLEN];
 1601                         char ip6bufm[INET6_ADDRSTRLEN];
 1602                         struct sockaddr_in6 *sin6;
 1603 
 1604                         sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
 1605                         nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add "
 1606                             "route for a prefix (%s/%d) on %s, gw=%s, mask=%s, "
 1607                             "flags=%lx errno = %d\n",
 1608                             ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
 1609                             pr->ndpr_plen, if_name(pr->ndpr_ifp),
 1610                             ip6_sprintf(ip6bufg, &sin6->sin6_addr),
 1611                             ip6_sprintf(ip6bufm, &mask6.sin6_addr),
 1612                             rtflags, error));
 1613 
 1614                         /* Save last error to return, see rtinit(). */
 1615                         a_failure = error;
 1616                 }
 1617 
 1618                 if (rt != NULL) {
 1619                         RT_LOCK(rt);
 1620                         RT_REMREF(rt);
 1621                         RT_UNLOCK(rt);
 1622                 }
 1623         }
 1624 
 1625         /* Return the last error we got. */
 1626         return (a_failure);
 1627 }
 1628 
 1629 static int
 1630 nd6_prefix_onlink(struct nd_prefix *pr)
 1631 {
 1632         struct ifaddr *ifa;
 1633         struct ifnet *ifp = pr->ndpr_ifp;
 1634         struct nd_prefix *opr;
 1635         int error = 0;
 1636         char ip6buf[INET6_ADDRSTRLEN];
 1637 
 1638         /* sanity check */
 1639         if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
 1640                 nd6log((LOG_ERR,
 1641                     "nd6_prefix_onlink: %s/%d is already on-link\n",
 1642                     ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
 1643                     pr->ndpr_plen));
 1644                 return (EEXIST);
 1645         }
 1646 
 1647         /*
 1648          * Add the interface route associated with the prefix.  Before
 1649          * installing the route, check if there's the same prefix on another
 1650          * interface, and the prefix has already installed the interface route.
 1651          * Although such a configuration is expected to be rare, we explicitly
 1652          * allow it.
 1653          */
 1654         LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
 1655                 if (opr == pr)
 1656                         continue;
 1657 
 1658                 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
 1659                         continue;
 1660 
 1661                 if (opr->ndpr_plen == pr->ndpr_plen &&
 1662                     in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
 1663                     &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen))
 1664                         return (0);
 1665         }
 1666 
 1667         /*
 1668          * We prefer link-local addresses as the associated interface address.
 1669          */
 1670         /* search for a link-local addr */
 1671         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
 1672             IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
 1673         if (ifa == NULL) {
 1674                 /* XXX: freebsd does not have ifa_ifwithaf */
 1675                 IF_ADDR_RLOCK(ifp);
 1676                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1677                         if (ifa->ifa_addr->sa_family == AF_INET6)
 1678                                 break;
 1679                 }
 1680                 if (ifa != NULL)
 1681                         ifa_ref(ifa);
 1682                 IF_ADDR_RUNLOCK(ifp);
 1683                 /* should we care about ia6_flags? */
 1684         }
 1685         if (ifa == NULL) {
 1686                 /*
 1687                  * This can still happen, when, for example, we receive an RA
 1688                  * containing a prefix with the L bit set and the A bit clear,
 1689                  * after removing all IPv6 addresses on the receiving
 1690                  * interface.  This should, of course, be rare though.
 1691                  */
 1692                 nd6log((LOG_NOTICE,
 1693                     "nd6_prefix_onlink: failed to find any ifaddr"
 1694                     " to add route for a prefix(%s/%d) on %s\n",
 1695                     ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
 1696                     pr->ndpr_plen, if_name(ifp)));
 1697                 return (0);
 1698         }
 1699 
 1700         error = nd6_prefix_onlink_rtrequest(pr, ifa);
 1701 
 1702         if (ifa != NULL)
 1703                 ifa_free(ifa);
 1704 
 1705         return (error);
 1706 }
 1707 
 1708 static int
 1709 nd6_prefix_offlink(struct nd_prefix *pr)
 1710 {
 1711         int error = 0;
 1712         struct ifnet *ifp = pr->ndpr_ifp;
 1713         struct nd_prefix *opr;
 1714         struct sockaddr_in6 sa6, mask6;
 1715         struct rtentry *rt;
 1716         char ip6buf[INET6_ADDRSTRLEN];
 1717         int fibnum, a_failure;
 1718 
 1719         /* sanity check */
 1720         if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
 1721                 nd6log((LOG_ERR,
 1722                     "nd6_prefix_offlink: %s/%d is already off-link\n",
 1723                     ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
 1724                     pr->ndpr_plen));
 1725                 return (EEXIST);
 1726         }
 1727 
 1728         bzero(&sa6, sizeof(sa6));
 1729         sa6.sin6_family = AF_INET6;
 1730         sa6.sin6_len = sizeof(sa6);
 1731         bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
 1732             sizeof(struct in6_addr));
 1733         bzero(&mask6, sizeof(mask6));
 1734         mask6.sin6_family = AF_INET6;
 1735         mask6.sin6_len = sizeof(sa6);
 1736         bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
 1737 
 1738         a_failure = 0;
 1739         for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
 1740                 rt = NULL;
 1741                 error = in6_rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
 1742                     (struct sockaddr *)&mask6, 0, &rt, fibnum);
 1743                 if (error == 0) {
 1744                         /* report the route deletion to the routing socket. */
 1745                         if (rt != NULL)
 1746                                 nd6_rtmsg(RTM_DELETE, rt);
 1747                 } else {
 1748                         /* Save last error to return, see rtinit(). */
 1749                         a_failure = error;
 1750                 }
 1751                 if (rt != NULL) {
 1752                         RTFREE(rt);
 1753                 }
 1754         }
 1755         error = a_failure;
 1756         if (error == 0) {
 1757                 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
 1758 
 1759                 /*
 1760                  * There might be the same prefix on another interface,
 1761                  * the prefix which could not be on-link just because we have
 1762                  * the interface route (see comments in nd6_prefix_onlink).
 1763                  * If there's one, try to make the prefix on-link on the
 1764                  * interface.
 1765                  */
 1766                 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
 1767                         if (opr == pr)
 1768                                 continue;
 1769 
 1770                         if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
 1771                                 continue;
 1772 
 1773                         /*
 1774                          * KAME specific: detached prefixes should not be
 1775                          * on-link.
 1776                          */
 1777                         if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
 1778                                 continue;
 1779 
 1780                         if (opr->ndpr_plen == pr->ndpr_plen &&
 1781                             in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
 1782                             &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
 1783                                 int e;
 1784 
 1785                                 if ((e = nd6_prefix_onlink(opr)) != 0) {
 1786                                         nd6log((LOG_ERR,
 1787                                             "nd6_prefix_offlink: failed to "
 1788                                             "recover a prefix %s/%d from %s "
 1789                                             "to %s (errno = %d)\n",
 1790                                             ip6_sprintf(ip6buf,
 1791                                                 &opr->ndpr_prefix.sin6_addr),
 1792                                             opr->ndpr_plen, if_name(ifp),
 1793                                             if_name(opr->ndpr_ifp), e));
 1794                                 }
 1795                         }
 1796                 }
 1797         } else {
 1798                 /* XXX: can we still set the NDPRF_ONLINK flag? */
 1799                 nd6log((LOG_ERR,
 1800                     "nd6_prefix_offlink: failed to delete route: "
 1801                     "%s/%d on %s (errno = %d)\n",
 1802                     ip6_sprintf(ip6buf, &sa6.sin6_addr), pr->ndpr_plen,
 1803                     if_name(ifp), error));
 1804         }
 1805 
 1806         return (error);
 1807 }
 1808 
 1809 static struct in6_ifaddr *
 1810 in6_ifadd(struct nd_prefixctl *pr, int mcast)
 1811 {
 1812         struct ifnet *ifp = pr->ndpr_ifp;
 1813         struct ifaddr *ifa;
 1814         struct in6_aliasreq ifra;
 1815         struct in6_ifaddr *ia, *ib;
 1816         int error, plen0;
 1817         struct in6_addr mask;
 1818         int prefixlen = pr->ndpr_plen;
 1819         int updateflags;
 1820         char ip6buf[INET6_ADDRSTRLEN];
 1821 
 1822         in6_prefixlen2mask(&mask, prefixlen);
 1823 
 1824         /*
 1825          * find a link-local address (will be interface ID).
 1826          * Is it really mandatory? Theoretically, a global or a site-local
 1827          * address can be configured without a link-local address, if we
 1828          * have a unique interface identifier...
 1829          *
 1830          * it is not mandatory to have a link-local address, we can generate
 1831          * interface identifier on the fly.  we do this because:
 1832          * (1) it should be the easiest way to find interface identifier.
 1833          * (2) RFC2462 5.4 suggesting the use of the same interface identifier
 1834          * for multiple addresses on a single interface, and possible shortcut
 1835          * of DAD.  we omitted DAD for this reason in the past.
 1836          * (3) a user can prevent autoconfiguration of global address
 1837          * by removing link-local address by hand (this is partly because we
 1838          * don't have other way to control the use of IPv6 on an interface.
 1839          * this has been our design choice - cf. NRL's "ifconfig auto").
 1840          * (4) it is easier to manage when an interface has addresses
 1841          * with the same interface identifier, than to have multiple addresses
 1842          * with different interface identifiers.
 1843          */
 1844         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
 1845         if (ifa)
 1846                 ib = (struct in6_ifaddr *)ifa;
 1847         else
 1848                 return NULL;
 1849 
 1850         /* prefixlen + ifidlen must be equal to 128 */
 1851         plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
 1852         if (prefixlen != plen0) {
 1853                 ifa_free(ifa);
 1854                 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
 1855                     "(prefix=%d ifid=%d)\n",
 1856                     if_name(ifp), prefixlen, 128 - plen0));
 1857                 return NULL;
 1858         }
 1859 
 1860         /* make ifaddr */
 1861 
 1862         bzero(&ifra, sizeof(ifra));
 1863         /*
 1864          * in6_update_ifa() does not use ifra_name, but we accurately set it
 1865          * for safety.
 1866          */
 1867         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
 1868         ifra.ifra_addr.sin6_family = AF_INET6;
 1869         ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
 1870         /* prefix */
 1871         ifra.ifra_addr.sin6_addr = pr->ndpr_prefix.sin6_addr;
 1872         ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
 1873         ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
 1874         ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
 1875         ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
 1876 
 1877         /* interface ID */
 1878         ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
 1879             (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
 1880         ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
 1881             (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
 1882         ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
 1883             (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
 1884         ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
 1885             (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
 1886         ifa_free(ifa);
 1887 
 1888         /* new prefix mask. */
 1889         ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
 1890         ifra.ifra_prefixmask.sin6_family = AF_INET6;
 1891         bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
 1892             sizeof(ifra.ifra_prefixmask.sin6_addr));
 1893 
 1894         /* lifetimes. */
 1895         ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
 1896         ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
 1897 
 1898         /* XXX: scope zone ID? */
 1899 
 1900         ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
 1901 
 1902         /*
 1903          * Make sure that we do not have this address already.  This should
 1904          * usually not happen, but we can still see this case, e.g., if we
 1905          * have manually configured the exact address to be configured.
 1906          */
 1907         ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
 1908             &ifra.ifra_addr.sin6_addr);
 1909         if (ifa != NULL) {
 1910                 ifa_free(ifa);
 1911                 /* this should be rare enough to make an explicit log */
 1912                 log(LOG_INFO, "in6_ifadd: %s is already configured\n",
 1913                     ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr));
 1914                 return (NULL);
 1915         }
 1916 
 1917         /*
 1918          * Allocate ifaddr structure, link into chain, etc.
 1919          * If we are going to create a new address upon receiving a multicasted
 1920          * RA, we need to impose a random delay before starting DAD.
 1921          * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2]
 1922          */
 1923         updateflags = 0;
 1924         if (mcast)
 1925                 updateflags |= IN6_IFAUPDATE_DADDELAY;
 1926         if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) {
 1927                 nd6log((LOG_ERR,
 1928                     "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
 1929                     ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr),
 1930                     if_name(ifp), error));
 1931                 return (NULL);  /* ifaddr must not have been allocated. */
 1932         }
 1933 
 1934         ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
 1935         /*
 1936          * XXXRW: Assumption of non-NULLness here might not be true with
 1937          * fine-grained locking -- should we validate it?  Or just return
 1938          * earlier ifa rather than looking it up again?
 1939          */
 1940         return (ia);            /* this is always non-NULL  and referenced. */
 1941 }
 1942 
 1943 /*
 1944  * ia0 - corresponding public address
 1945  */
 1946 int
 1947 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay)
 1948 {
 1949         struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
 1950         struct in6_ifaddr *newia, *ia;
 1951         struct in6_aliasreq ifra;
 1952         int i, error;
 1953         int trylimit = 3;       /* XXX: adhoc value */
 1954         int updateflags;
 1955         u_int32_t randid[2];
 1956         time_t vltime0, pltime0;
 1957 
 1958         bzero(&ifra, sizeof(ifra));
 1959         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
 1960         ifra.ifra_addr = ia0->ia_addr;
 1961         /* copy prefix mask */
 1962         ifra.ifra_prefixmask = ia0->ia_prefixmask;
 1963         /* clear the old IFID */
 1964         for (i = 0; i < 4; i++) {
 1965                 ifra.ifra_addr.sin6_addr.s6_addr32[i] &=
 1966                     ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
 1967         }
 1968 
 1969   again:
 1970         if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
 1971             (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) {
 1972                 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good "
 1973                     "random IFID\n"));
 1974                 return (EINVAL);
 1975         }
 1976         ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
 1977             (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
 1978         ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
 1979             (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
 1980 
 1981         /*
 1982          * in6_get_tmpifid() quite likely provided a unique interface ID.
 1983          * However, we may still have a chance to see collision, because
 1984          * there may be a time lag between generation of the ID and generation
 1985          * of the address.  So, we'll do one more sanity check.
 1986          */
 1987         IN6_IFADDR_RLOCK();
 1988         TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
 1989                 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
 1990                     &ifra.ifra_addr.sin6_addr)) {
 1991                         if (trylimit-- == 0) {
 1992                                 IN6_IFADDR_RUNLOCK();
 1993                                 /*
 1994                                  * Give up.  Something strange should have
 1995                                  * happened.
 1996                                  */
 1997                                 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to "
 1998                                     "find a unique random IFID\n"));
 1999                                 return (EEXIST);
 2000                         }
 2001                         IN6_IFADDR_RUNLOCK();
 2002                         forcegen = 1;
 2003                         goto again;
 2004                 }
 2005         }
 2006         IN6_IFADDR_RUNLOCK();
 2007 
 2008         /*
 2009          * The Valid Lifetime is the lower of the Valid Lifetime of the
 2010          * public address or TEMP_VALID_LIFETIME.
 2011          * The Preferred Lifetime is the lower of the Preferred Lifetime
 2012          * of the public address or TEMP_PREFERRED_LIFETIME -
 2013          * DESYNC_FACTOR.
 2014          */
 2015         if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
 2016                 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
 2017                     (ia0->ia6_lifetime.ia6t_vltime -
 2018                     (time_second - ia0->ia6_updatetime));
 2019                 if (vltime0 > V_ip6_temp_valid_lifetime)
 2020                         vltime0 = V_ip6_temp_valid_lifetime;
 2021         } else
 2022                 vltime0 = V_ip6_temp_valid_lifetime;
 2023         if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
 2024                 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
 2025                     (ia0->ia6_lifetime.ia6t_pltime -
 2026                     (time_second - ia0->ia6_updatetime));
 2027                 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){
 2028                         pltime0 = V_ip6_temp_preferred_lifetime -
 2029                             V_ip6_desync_factor;
 2030                 }
 2031         } else
 2032                 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor;
 2033         ifra.ifra_lifetime.ia6t_vltime = vltime0;
 2034         ifra.ifra_lifetime.ia6t_pltime = pltime0;
 2035 
 2036         /*
 2037          * A temporary address is created only if this calculated Preferred
 2038          * Lifetime is greater than REGEN_ADVANCE time units.
 2039          */
 2040         if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance)
 2041                 return (0);
 2042 
 2043         /* XXX: scope zone ID? */
 2044 
 2045         ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
 2046 
 2047         /* allocate ifaddr structure, link into chain, etc. */
 2048         updateflags = 0;
 2049         if (delay)
 2050                 updateflags |= IN6_IFAUPDATE_DADDELAY;
 2051         if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0)
 2052                 return (error);
 2053 
 2054         newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
 2055         if (newia == NULL) {    /* XXX: can it happen? */
 2056                 nd6log((LOG_ERR,
 2057                     "in6_tmpifadd: ifa update succeeded, but we got "
 2058                     "no ifaddr\n"));
 2059                 return (EINVAL); /* XXX */
 2060         }
 2061         newia->ia6_ndpr = ia0->ia6_ndpr;
 2062         newia->ia6_ndpr->ndpr_refcnt++;
 2063         ifa_free(&newia->ia_ifa);
 2064 
 2065         /*
 2066          * A newly added address might affect the status of other addresses.
 2067          * XXX: when the temporary address is generated with a new public
 2068          * address, the onlink check is redundant.  However, it would be safe
 2069          * to do the check explicitly everywhere a new address is generated,
 2070          * and, in fact, we surely need the check when we create a new
 2071          * temporary address due to deprecation of an old temporary address.
 2072          */
 2073         pfxlist_onlink_check();
 2074 
 2075         return (0);
 2076 }
 2077 
 2078 static int
 2079 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
 2080 {
 2081         if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
 2082                 ndpr->ndpr_preferred = 0;
 2083         else
 2084                 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime;
 2085         if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
 2086                 ndpr->ndpr_expire = 0;
 2087         else
 2088                 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime;
 2089 
 2090         return 0;
 2091 }
 2092 
 2093 static void
 2094 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
 2095 {
 2096         /* init ia6t_expire */
 2097         if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
 2098                 lt6->ia6t_expire = 0;
 2099         else {
 2100                 lt6->ia6t_expire = time_second;
 2101                 lt6->ia6t_expire += lt6->ia6t_vltime;
 2102         }
 2103 
 2104         /* init ia6t_preferred */
 2105         if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
 2106                 lt6->ia6t_preferred = 0;
 2107         else {
 2108                 lt6->ia6t_preferred = time_second;
 2109                 lt6->ia6t_preferred += lt6->ia6t_pltime;
 2110         }
 2111 }
 2112 
 2113 /*
 2114  * Delete all the routing table entries that use the specified gateway.
 2115  * XXX: this function causes search through all entries of routing table, so
 2116  * it shouldn't be called when acting as a router.
 2117  */
 2118 void
 2119 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
 2120 {
 2121         struct radix_node_head *rnh;
 2122         u_int fibnum;
 2123         int s = splnet();
 2124 
 2125         /* We'll care only link-local addresses */
 2126         if (!IN6_IS_ADDR_LINKLOCAL(gateway)) {
 2127                 splx(s);
 2128                 return;
 2129         }
 2130 
 2131         /* XXX Do we really need to walk any but the default FIB? */
 2132         for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
 2133                 rnh = rt_tables_get_rnh(fibnum, AF_INET6);
 2134                 if (rnh == NULL)
 2135                         continue;
 2136 
 2137                 RADIX_NODE_HEAD_LOCK(rnh);
 2138                 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
 2139                 RADIX_NODE_HEAD_UNLOCK(rnh);
 2140         }
 2141         splx(s);
 2142 }
 2143 
 2144 static int
 2145 rt6_deleteroute(struct radix_node *rn, void *arg)
 2146 {
 2147 #define SIN6(s) ((struct sockaddr_in6 *)s)
 2148         struct rtentry *rt = (struct rtentry *)rn;
 2149         struct in6_addr *gate = (struct in6_addr *)arg;
 2150 
 2151         if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
 2152                 return (0);
 2153 
 2154         if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) {
 2155                 return (0);
 2156         }
 2157 
 2158         /*
 2159          * Do not delete a static route.
 2160          * XXX: this seems to be a bit ad-hoc. Should we consider the
 2161          * 'cloned' bit instead?
 2162          */
 2163         if ((rt->rt_flags & RTF_STATIC) != 0)
 2164                 return (0);
 2165 
 2166         /*
 2167          * We delete only host route. This means, in particular, we don't
 2168          * delete default route.
 2169          */
 2170         if ((rt->rt_flags & RTF_HOST) == 0)
 2171                 return (0);
 2172 
 2173         return (in6_rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
 2174             rt_mask(rt), rt->rt_flags, NULL, rt->rt_fibnum));
 2175 #undef SIN6
 2176 }
 2177 
 2178 int
 2179 nd6_setdefaultiface(int ifindex)
 2180 {
 2181         int error = 0;
 2182 
 2183         if (ifindex < 0 || V_if_index < ifindex)
 2184                 return (EINVAL);
 2185         if (ifindex != 0 && !ifnet_byindex(ifindex))
 2186                 return (EINVAL);
 2187 
 2188         if (V_nd6_defifindex != ifindex) {
 2189                 V_nd6_defifindex = ifindex;
 2190                 if (V_nd6_defifindex > 0)
 2191                         V_nd6_defifp = ifnet_byindex(V_nd6_defifindex);
 2192                 else
 2193                         V_nd6_defifp = NULL;
 2194 
 2195                 /*
 2196                  * Our current implementation assumes one-to-one maping between
 2197                  * interfaces and links, so it would be natural to use the
 2198                  * default interface as the default link.
 2199                  */
 2200                 scope6_setdefault(V_nd6_defifp);
 2201         }
 2202 
 2203         return (error);
 2204 }

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