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: releng/8.0/sys/netinet6/nd6_rtr.c 196674 2009-08-30 22:44:12Z qingli $");
   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 __P((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 __P((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 __P((struct nd_prefix *,
   85         struct in6_addrlifetime *));
   86 
   87 static int rt6_deleteroute(struct radix_node *, void *);
   88 
   89 VNET_DECLARE(int, nd6_recalc_reachtm_interval);
   90 #define V_nd6_recalc_reachtm_interval   VNET(nd6_recalc_reachtm_interval)
   91 
   92 static VNET_DEFINE(struct ifnet *, nd6_defifp);
   93 #define V_nd6_defifp                    VNET(nd6_defifp)
   94 
   95 VNET_DEFINE(int, nd6_defifindex);
   96 VNET_DEFINE(int, ip6_use_tempaddr);
   97 VNET_DEFINE(int, ip6_desync_factor);
   98 VNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime);
   99 VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime);
  100 VNET_DEFINE(int, ip6_temp_regen_advance);
  101 
  102 /* RTPREF_MEDIUM has to be 0! */
  103 #define RTPREF_HIGH     1
  104 #define RTPREF_MEDIUM   0
  105 #define RTPREF_LOW      (-1)
  106 #define RTPREF_RESERVED (-2)
  107 #define RTPREF_INVALID  (-3)    /* internal */
  108 
  109 /*
  110  * Receive Router Solicitation Message - just for routers.
  111  * Router solicitation/advertisement is mostly managed by userland program
  112  * (rtadvd) so here we have no function like nd6_ra_output().
  113  *
  114  * Based on RFC 2461
  115  */
  116 void
  117 nd6_rs_input(struct mbuf *m, int off, int icmp6len)
  118 {
  119         struct ifnet *ifp = m->m_pkthdr.rcvif;
  120         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  121         struct nd_router_solicit *nd_rs;
  122         struct in6_addr saddr6 = ip6->ip6_src;
  123         char *lladdr = NULL;
  124         int lladdrlen = 0;
  125         union nd_opts ndopts;
  126         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
  127 
  128         /* If I'm not a router, ignore it. */
  129         if (V_ip6_accept_rtadv != 0 || V_ip6_forwarding != 1)
  130                 goto freeit;
  131 
  132         /* Sanity checks */
  133         if (ip6->ip6_hlim != 255) {
  134                 nd6log((LOG_ERR,
  135                     "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
  136                     ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
  137                     ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
  138                 goto bad;
  139         }
  140 
  141         /*
  142          * Don't update the neighbor cache, if src = ::.
  143          * This indicates that the src has no IP address assigned yet.
  144          */
  145         if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
  146                 goto freeit;
  147 
  148 #ifndef PULLDOWN_TEST
  149         IP6_EXTHDR_CHECK(m, off, icmp6len,);
  150         nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
  151 #else
  152         IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
  153         if (nd_rs == NULL) {
  154                 ICMP6STAT_INC(icp6s_tooshort);
  155                 return;
  156         }
  157 #endif
  158 
  159         icmp6len -= sizeof(*nd_rs);
  160         nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
  161         if (nd6_options(&ndopts) < 0) {
  162                 nd6log((LOG_INFO,
  163                     "nd6_rs_input: invalid ND option, ignored\n"));
  164                 /* nd6_options have incremented stats */
  165                 goto freeit;
  166         }
  167 
  168         if (ndopts.nd_opts_src_lladdr) {
  169                 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
  170                 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
  171         }
  172 
  173         if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
  174                 nd6log((LOG_INFO,
  175                     "nd6_rs_input: lladdrlen mismatch for %s "
  176                     "(if %d, RS packet %d)\n",
  177                     ip6_sprintf(ip6bufs, &saddr6),
  178                     ifp->if_addrlen, lladdrlen - 2));
  179                 goto bad;
  180         }
  181 
  182         nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
  183 
  184  freeit:
  185         m_freem(m);
  186         return;
  187 
  188  bad:
  189         ICMP6STAT_INC(icp6s_badrs);
  190         m_freem(m);
  191 }
  192 
  193 /*
  194  * Receive Router Advertisement Message.
  195  *
  196  * Based on RFC 2461
  197  * TODO: on-link bit on prefix information
  198  * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
  199  */
  200 void
  201 nd6_ra_input(struct mbuf *m, int off, int icmp6len)
  202 {
  203         struct ifnet *ifp = m->m_pkthdr.rcvif;
  204         struct nd_ifinfo *ndi = ND_IFINFO(ifp);
  205         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  206         struct nd_router_advert *nd_ra;
  207         struct in6_addr saddr6 = ip6->ip6_src;
  208         int mcast = 0;
  209         union nd_opts ndopts;
  210         struct nd_defrouter *dr;
  211         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
  212 
  213         /*
  214          * We only accept RAs only when
  215          * the system-wide variable allows the acceptance, and
  216          * per-interface variable allows RAs on the receiving interface.
  217          */
  218         if (V_ip6_accept_rtadv == 0)
  219                 goto freeit;
  220         if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
  221                 goto freeit;
  222 
  223         if (ip6->ip6_hlim != 255) {
  224                 nd6log((LOG_ERR,
  225                     "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
  226                     ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
  227                     ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
  228                 goto bad;
  229         }
  230 
  231         if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
  232                 nd6log((LOG_ERR,
  233                     "nd6_ra_input: src %s is not link-local\n",
  234                     ip6_sprintf(ip6bufs, &saddr6)));
  235                 goto bad;
  236         }
  237 
  238 #ifndef PULLDOWN_TEST
  239         IP6_EXTHDR_CHECK(m, off, icmp6len,);
  240         nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
  241 #else
  242         IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
  243         if (nd_ra == NULL) {
  244                 ICMP6STAT_INC(icp6s_tooshort);
  245                 return;
  246         }
  247 #endif
  248 
  249         icmp6len -= sizeof(*nd_ra);
  250         nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
  251         if (nd6_options(&ndopts) < 0) {
  252                 nd6log((LOG_INFO,
  253                     "nd6_ra_input: invalid ND option, ignored\n"));
  254                 /* nd6_options have incremented stats */
  255                 goto freeit;
  256         }
  257 
  258     {
  259         struct nd_defrouter dr0;
  260         u_int32_t advreachable = nd_ra->nd_ra_reachable;
  261 
  262         /* remember if this is a multicasted advertisement */
  263         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
  264                 mcast = 1;
  265 
  266         bzero(&dr0, sizeof(dr0));
  267         dr0.rtaddr = saddr6;
  268         dr0.flags  = nd_ra->nd_ra_flags_reserved;
  269         dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
  270         dr0.expire = time_second + dr0.rtlifetime;
  271         dr0.ifp = ifp;
  272         /* unspecified or not? (RFC 2461 6.3.4) */
  273         if (advreachable) {
  274                 advreachable = ntohl(advreachable);
  275                 if (advreachable <= MAX_REACHABLE_TIME &&
  276                     ndi->basereachable != advreachable) {
  277                         ndi->basereachable = advreachable;
  278                         ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
  279                         ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */
  280                 }
  281         }
  282         if (nd_ra->nd_ra_retransmit)
  283                 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
  284         if (nd_ra->nd_ra_curhoplimit)
  285                 ndi->chlim = nd_ra->nd_ra_curhoplimit;
  286         dr = defrtrlist_update(&dr0);
  287     }
  288 
  289         /*
  290          * prefix
  291          */
  292         if (ndopts.nd_opts_pi) {
  293                 struct nd_opt_hdr *pt;
  294                 struct nd_opt_prefix_info *pi = NULL;
  295                 struct nd_prefixctl pr;
  296 
  297                 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
  298                      pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
  299                      pt = (struct nd_opt_hdr *)((caddr_t)pt +
  300                                                 (pt->nd_opt_len << 3))) {
  301                         if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
  302                                 continue;
  303                         pi = (struct nd_opt_prefix_info *)pt;
  304 
  305                         if (pi->nd_opt_pi_len != 4) {
  306                                 nd6log((LOG_INFO,
  307                                     "nd6_ra_input: invalid option "
  308                                     "len %d for prefix information option, "
  309                                     "ignored\n", pi->nd_opt_pi_len));
  310                                 continue;
  311                         }
  312 
  313                         if (128 < pi->nd_opt_pi_prefix_len) {
  314                                 nd6log((LOG_INFO,
  315                                     "nd6_ra_input: invalid prefix "
  316                                     "len %d for prefix information option, "
  317                                     "ignored\n", pi->nd_opt_pi_prefix_len));
  318                                 continue;
  319                         }
  320 
  321                         if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
  322                          || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
  323                                 nd6log((LOG_INFO,
  324                                     "nd6_ra_input: invalid prefix "
  325                                     "%s, ignored\n",
  326                                     ip6_sprintf(ip6bufs,
  327                                         &pi->nd_opt_pi_prefix)));
  328                                 continue;
  329                         }
  330 
  331                         bzero(&pr, sizeof(pr));
  332                         pr.ndpr_prefix.sin6_family = AF_INET6;
  333                         pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
  334                         pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
  335                         pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
  336 
  337                         pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
  338                             ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
  339                         pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
  340                             ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
  341                         pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
  342                         pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
  343                         pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
  344                         (void)prelist_update(&pr, dr, m, mcast);
  345                 }
  346         }
  347 
  348         /*
  349          * MTU
  350          */
  351         if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
  352                 u_long mtu;
  353                 u_long maxmtu;
  354 
  355                 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
  356 
  357                 /* lower bound */
  358                 if (mtu < IPV6_MMTU) {
  359                         nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
  360                             "mtu=%lu sent from %s, ignoring\n",
  361                             mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src)));
  362                         goto skip;
  363                 }
  364 
  365                 /* upper bound */
  366                 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
  367                     ? ndi->maxmtu : ifp->if_mtu;
  368                 if (mtu <= maxmtu) {
  369                         int change = (ndi->linkmtu != mtu);
  370 
  371                         ndi->linkmtu = mtu;
  372                         if (change) /* in6_maxmtu may change */
  373                                 in6_setmaxmtu();
  374                 } else {
  375                         nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
  376                             "mtu=%lu sent from %s; "
  377                             "exceeds maxmtu %lu, ignoring\n",
  378                             mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu));
  379                 }
  380         }
  381 
  382  skip:
  383 
  384         /*
  385          * Source link layer address
  386          */
  387     {
  388         char *lladdr = NULL;
  389         int lladdrlen = 0;
  390 
  391         if (ndopts.nd_opts_src_lladdr) {
  392                 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
  393                 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
  394         }
  395 
  396         if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
  397                 nd6log((LOG_INFO,
  398                     "nd6_ra_input: lladdrlen mismatch for %s "
  399                     "(if %d, RA packet %d)\n", ip6_sprintf(ip6bufs, &saddr6),
  400                     ifp->if_addrlen, lladdrlen - 2));
  401                 goto bad;
  402         }
  403 
  404         nd6_cache_lladdr(ifp, &saddr6, lladdr,
  405             lladdrlen, ND_ROUTER_ADVERT, 0);
  406 
  407         /*
  408          * Installing a link-layer address might change the state of the
  409          * router's neighbor cache, which might also affect our on-link
  410          * detection of adveritsed prefixes.
  411          */
  412         pfxlist_onlink_check();
  413     }
  414 
  415  freeit:
  416         m_freem(m);
  417         return;
  418 
  419  bad:
  420         ICMP6STAT_INC(icp6s_badra);
  421         m_freem(m);
  422 }
  423 
  424 /*
  425  * default router list proccessing sub routines
  426  */
  427 
  428 /* tell the change to user processes watching the routing socket. */
  429 static void
  430 nd6_rtmsg(int cmd, struct rtentry *rt)
  431 {
  432         struct rt_addrinfo info;
  433         struct ifnet *ifp;
  434         struct ifaddr *ifa;
  435 
  436         bzero((caddr_t)&info, sizeof(info));
  437         info.rti_info[RTAX_DST] = rt_key(rt);
  438         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
  439         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
  440         ifp = rt->rt_ifp;
  441         if (ifp != NULL) {
  442                 IF_ADDR_LOCK(ifp);
  443                 ifa = TAILQ_FIRST(&ifp->if_addrhead);
  444                 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
  445                 ifa_ref(ifa);
  446                 IF_ADDR_UNLOCK(ifp);
  447                 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
  448         } else
  449                 ifa = NULL;
  450 
  451         rt_missmsg(cmd, &info, rt->rt_flags, 0);
  452         if (ifa != NULL)
  453                 ifa_free(ifa);
  454 }
  455 
  456 void
  457 defrouter_addreq(struct nd_defrouter *new)
  458 {
  459         struct sockaddr_in6 def, mask, gate;
  460         struct rtentry *newrt = NULL;
  461         int s;
  462         int error;
  463 
  464         bzero(&def, sizeof(def));
  465         bzero(&mask, sizeof(mask));
  466         bzero(&gate, sizeof(gate));
  467 
  468         def.sin6_len = mask.sin6_len = gate.sin6_len =
  469             sizeof(struct sockaddr_in6);
  470         def.sin6_family = gate.sin6_family = AF_INET6;
  471         gate.sin6_addr = new->rtaddr;
  472 
  473         s = splnet();
  474         error = rtrequest(RTM_ADD, (struct sockaddr *)&def,
  475             (struct sockaddr *)&gate, (struct sockaddr *)&mask,
  476             RTF_GATEWAY, &newrt);
  477         if (newrt) {
  478                 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
  479                 RTFREE(newrt);
  480         }
  481         if (error == 0)
  482                 new->installed = 1;
  483         splx(s);
  484         return;
  485 }
  486 
  487 struct nd_defrouter *
  488 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
  489 {
  490         struct nd_defrouter *dr;
  491 
  492         for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
  493              dr = TAILQ_NEXT(dr, dr_entry)) {
  494                 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
  495                         return (dr);
  496         }
  497 
  498         return (NULL);          /* search failed */
  499 }
  500 
  501 /*
  502  * Remove the default route for a given router.
  503  * This is just a subroutine function for defrouter_select(), and should
  504  * not be called from anywhere else.
  505  */
  506 static void
  507 defrouter_delreq(struct nd_defrouter *dr)
  508 {
  509         struct sockaddr_in6 def, mask, gate;
  510         struct rtentry *oldrt = NULL;
  511 
  512         bzero(&def, sizeof(def));
  513         bzero(&mask, sizeof(mask));
  514         bzero(&gate, sizeof(gate));
  515 
  516         def.sin6_len = mask.sin6_len = gate.sin6_len =
  517             sizeof(struct sockaddr_in6);
  518         def.sin6_family = gate.sin6_family = AF_INET6;
  519         gate.sin6_addr = dr->rtaddr;
  520 
  521         rtrequest(RTM_DELETE, (struct sockaddr *)&def,
  522             (struct sockaddr *)&gate,
  523             (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt);
  524         if (oldrt) {
  525                 nd6_rtmsg(RTM_DELETE, oldrt);
  526                 RTFREE(oldrt);
  527         }
  528 
  529         dr->installed = 0;
  530 }
  531 
  532 /*
  533  * remove all default routes from default router list
  534  */
  535 void
  536 defrouter_reset(void)
  537 {
  538         struct nd_defrouter *dr;
  539 
  540         for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
  541              dr = TAILQ_NEXT(dr, dr_entry))
  542                 defrouter_delreq(dr);
  543 
  544         /*
  545          * XXX should we also nuke any default routers in the kernel, by
  546          * going through them by rtalloc1()?
  547          */
  548 }
  549 
  550 void
  551 defrtrlist_del(struct nd_defrouter *dr)
  552 {
  553         struct nd_defrouter *deldr = NULL;
  554         struct nd_prefix *pr;
  555 
  556         /*
  557          * Flush all the routing table entries that use the router
  558          * as a next hop.
  559          */
  560         if (!V_ip6_forwarding && V_ip6_accept_rtadv) /* XXX: better condition? */
  561                 rt6_flush(&dr->rtaddr, dr->ifp);
  562 
  563         if (dr->installed) {
  564                 deldr = dr;
  565                 defrouter_delreq(dr);
  566         }
  567         TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
  568 
  569         /*
  570          * Also delete all the pointers to the router in each prefix lists.
  571          */
  572         for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
  573                 struct nd_pfxrouter *pfxrtr;
  574                 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
  575                         pfxrtr_del(pfxrtr);
  576         }
  577         pfxlist_onlink_check();
  578 
  579         /*
  580          * If the router is the primary one, choose a new one.
  581          * Note that defrouter_select() will remove the current gateway
  582          * from the routing table.
  583          */
  584         if (deldr)
  585                 defrouter_select();
  586 
  587         free(dr, M_IP6NDP);
  588 }
  589 
  590 /*
  591  * Default Router Selection according to Section 6.3.6 of RFC 2461 and
  592  * draft-ietf-ipngwg-router-selection:
  593  * 1) Routers that are reachable or probably reachable should be preferred.
  594  *    If we have more than one (probably) reachable router, prefer ones
  595  *    with the highest router preference.
  596  * 2) When no routers on the list are known to be reachable or
  597  *    probably reachable, routers SHOULD be selected in a round-robin
  598  *    fashion, regardless of router preference values.
  599  * 3) If the Default Router List is empty, assume that all
  600  *    destinations are on-link.
  601  *
  602  * We assume nd_defrouter is sorted by router preference value.
  603  * Since the code below covers both with and without router preference cases,
  604  * we do not need to classify the cases by ifdef.
  605  *
  606  * At this moment, we do not try to install more than one default router,
  607  * even when the multipath routing is available, because we're not sure about
  608  * the benefits for stub hosts comparing to the risk of making the code
  609  * complicated and the possibility of introducing bugs.
  610  */
  611 void
  612 defrouter_select(void)
  613 {
  614         int s = splnet();
  615         struct nd_defrouter *dr, *selected_dr = NULL, *installed_dr = NULL;
  616         struct llentry *ln = NULL;
  617 
  618         /*
  619          * This function should be called only when acting as an autoconfigured
  620          * host.  Although the remaining part of this function is not effective
  621          * if the node is not an autoconfigured host, we explicitly exclude
  622          * such cases here for safety.
  623          */
  624         if (V_ip6_forwarding || !V_ip6_accept_rtadv) {
  625                 nd6log((LOG_WARNING,
  626                     "defrouter_select: called unexpectedly (forwarding=%d, "
  627                     "accept_rtadv=%d)\n", V_ip6_forwarding, V_ip6_accept_rtadv));
  628                 splx(s);
  629                 return;
  630         }
  631 
  632         /*
  633          * Let's handle easy case (3) first:
  634          * If default router list is empty, there's nothing to be done.
  635          */
  636         if (!TAILQ_FIRST(&V_nd_defrouter)) {
  637                 splx(s);
  638                 return;
  639         }
  640 
  641         /*
  642          * Search for a (probably) reachable router from the list.
  643          * We just pick up the first reachable one (if any), assuming that
  644          * the ordering rule of the list described in defrtrlist_update().
  645          */
  646         for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
  647              dr = TAILQ_NEXT(dr, dr_entry)) {
  648                 IF_AFDATA_LOCK(dr->ifp);
  649                 if (selected_dr == NULL &&
  650                     (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
  651                     ND6_IS_LLINFO_PROBREACH(ln)) {
  652                         selected_dr = dr;
  653                 }
  654                 IF_AFDATA_UNLOCK(dr->ifp);
  655                 if (ln != NULL) {
  656                         LLE_RUNLOCK(ln);
  657                         ln = NULL;
  658                 }
  659 
  660                 if (dr->installed && installed_dr == NULL)
  661                         installed_dr = dr;
  662                 else if (dr->installed && installed_dr) {
  663                         /* this should not happen.  warn for diagnosis. */
  664                         log(LOG_ERR, "defrouter_select: more than one router"
  665                             " is installed\n");
  666                 }
  667         }
  668         /*
  669          * If none of the default routers was found to be reachable,
  670          * round-robin the list regardless of preference.
  671          * Otherwise, if we have an installed router, check if the selected
  672          * (reachable) router should really be preferred to the installed one.
  673          * We only prefer the new router when the old one is not reachable
  674          * or when the new one has a really higher preference value.
  675          */
  676         if (selected_dr == NULL) {
  677                 if (installed_dr == NULL || !TAILQ_NEXT(installed_dr, dr_entry))
  678                         selected_dr = TAILQ_FIRST(&V_nd_defrouter);
  679                 else
  680                         selected_dr = TAILQ_NEXT(installed_dr, dr_entry);
  681         } else if (installed_dr) {
  682                 IF_AFDATA_LOCK(installed_dr->ifp);
  683                 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0, installed_dr->ifp)) &&
  684                     ND6_IS_LLINFO_PROBREACH(ln) &&
  685                     rtpref(selected_dr) <= rtpref(installed_dr)) {
  686                         selected_dr = installed_dr;
  687                 }
  688                 IF_AFDATA_UNLOCK(installed_dr->ifp);
  689                 if (ln != NULL)
  690                         LLE_RUNLOCK(ln);
  691         }
  692 
  693         /*
  694          * If the selected router is different than the installed one,
  695          * remove the installed router and install the selected one.
  696          * Note that the selected router is never NULL here.
  697          */
  698         if (installed_dr != selected_dr) {
  699                 if (installed_dr)
  700                         defrouter_delreq(installed_dr);
  701                 defrouter_addreq(selected_dr);
  702         }
  703 
  704         splx(s);
  705         return;
  706 }
  707 
  708 /*
  709  * for default router selection
  710  * regards router-preference field as a 2-bit signed integer
  711  */
  712 static int
  713 rtpref(struct nd_defrouter *dr)
  714 {
  715         switch (dr->flags & ND_RA_FLAG_RTPREF_MASK) {
  716         case ND_RA_FLAG_RTPREF_HIGH:
  717                 return (RTPREF_HIGH);
  718         case ND_RA_FLAG_RTPREF_MEDIUM:
  719         case ND_RA_FLAG_RTPREF_RSV:
  720                 return (RTPREF_MEDIUM);
  721         case ND_RA_FLAG_RTPREF_LOW:
  722                 return (RTPREF_LOW);
  723         default:
  724                 /*
  725                  * This case should never happen.  If it did, it would mean a
  726                  * serious bug of kernel internal.  We thus always bark here.
  727                  * Or, can we even panic?
  728                  */
  729                 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->flags);
  730                 return (RTPREF_INVALID);
  731         }
  732         /* NOTREACHED */
  733 }
  734 
  735 static struct nd_defrouter *
  736 defrtrlist_update(struct nd_defrouter *new)
  737 {
  738         struct nd_defrouter *dr, *n;
  739         int s = splnet();
  740 
  741         if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
  742                 /* entry exists */
  743                 if (new->rtlifetime == 0) {
  744                         defrtrlist_del(dr);
  745                         dr = NULL;
  746                 } else {
  747                         int oldpref = rtpref(dr);
  748 
  749                         /* override */
  750                         dr->flags = new->flags; /* xxx flag check */
  751                         dr->rtlifetime = new->rtlifetime;
  752                         dr->expire = new->expire;
  753 
  754                         /*
  755                          * If the preference does not change, there's no need
  756                          * to sort the entries.
  757                          */
  758                         if (rtpref(new) == oldpref) {
  759                                 splx(s);
  760                                 return (dr);
  761                         }
  762 
  763                         /*
  764                          * preferred router may be changed, so relocate
  765                          * this router.
  766                          * XXX: calling TAILQ_REMOVE directly is a bad manner.
  767                          * However, since defrtrlist_del() has many side
  768                          * effects, we intentionally do so here.
  769                          * defrouter_select() below will handle routing
  770                          * changes later.
  771                          */
  772                         TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
  773                         n = dr;
  774                         goto insert;
  775                 }
  776                 splx(s);
  777                 return (dr);
  778         }
  779 
  780         /* entry does not exist */
  781         if (new->rtlifetime == 0) {
  782                 splx(s);
  783                 return (NULL);
  784         }
  785 
  786         n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
  787         if (n == NULL) {
  788                 splx(s);
  789                 return (NULL);
  790         }
  791         bzero(n, sizeof(*n));
  792         *n = *new;
  793 
  794 insert:
  795         /*
  796          * Insert the new router in the Default Router List;
  797          * The Default Router List should be in the descending order
  798          * of router-preferece.  Routers with the same preference are
  799          * sorted in the arriving time order.
  800          */
  801 
  802         /* insert at the end of the group */
  803         for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
  804              dr = TAILQ_NEXT(dr, dr_entry)) {
  805                 if (rtpref(n) > rtpref(dr))
  806                         break;
  807         }
  808         if (dr)
  809                 TAILQ_INSERT_BEFORE(dr, n, dr_entry);
  810         else
  811                 TAILQ_INSERT_TAIL(&V_nd_defrouter, n, dr_entry);
  812 
  813         defrouter_select();
  814 
  815         splx(s);
  816 
  817         return (n);
  818 }
  819 
  820 static struct nd_pfxrouter *
  821 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
  822 {
  823         struct nd_pfxrouter *search;
  824 
  825         for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
  826                 if (search->router == dr)
  827                         break;
  828         }
  829 
  830         return (search);
  831 }
  832 
  833 static void
  834 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
  835 {
  836         struct nd_pfxrouter *new;
  837 
  838         new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
  839         if (new == NULL)
  840                 return;
  841         bzero(new, sizeof(*new));
  842         new->router = dr;
  843 
  844         LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
  845 
  846         pfxlist_onlink_check();
  847 }
  848 
  849 static void
  850 pfxrtr_del(struct nd_pfxrouter *pfr)
  851 {
  852         LIST_REMOVE(pfr, pfr_entry);
  853         free(pfr, M_IP6NDP);
  854 }
  855 
  856 struct nd_prefix *
  857 nd6_prefix_lookup(struct nd_prefixctl *key)
  858 {
  859         struct nd_prefix *search;
  860 
  861         for (search = V_nd_prefix.lh_first;
  862             search; search = search->ndpr_next) {
  863                 if (key->ndpr_ifp == search->ndpr_ifp &&
  864                     key->ndpr_plen == search->ndpr_plen &&
  865                     in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr,
  866                     &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) {
  867                         break;
  868                 }
  869         }
  870 
  871         return (search);
  872 }
  873 
  874 int
  875 nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr,
  876     struct nd_prefix **newp)
  877 {
  878         struct nd_prefix *new = NULL;
  879         int error = 0;
  880         int i, s;
  881         char ip6buf[INET6_ADDRSTRLEN];
  882 
  883         new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
  884         if (new == NULL)
  885                 return(ENOMEM);
  886         bzero(new, sizeof(*new));
  887         new->ndpr_ifp = pr->ndpr_ifp;
  888         new->ndpr_prefix = pr->ndpr_prefix;
  889         new->ndpr_plen = pr->ndpr_plen;
  890         new->ndpr_vltime = pr->ndpr_vltime;
  891         new->ndpr_pltime = pr->ndpr_pltime;
  892         new->ndpr_flags = pr->ndpr_flags;
  893         if ((error = in6_init_prefix_ltimes(new)) != 0) {
  894                 free(new, M_IP6NDP);
  895                 return(error);
  896         }
  897         new->ndpr_lastupdate = time_second;
  898         if (newp != NULL)
  899                 *newp = new;
  900 
  901         /* initialization */
  902         LIST_INIT(&new->ndpr_advrtrs);
  903         in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
  904         /* make prefix in the canonical form */
  905         for (i = 0; i < 4; i++)
  906                 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
  907                     new->ndpr_mask.s6_addr32[i];
  908 
  909         s = splnet();
  910         /* link ndpr_entry to nd_prefix list */
  911         LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry);
  912         splx(s);
  913 
  914         /* ND_OPT_PI_FLAG_ONLINK processing */
  915         if (new->ndpr_raf_onlink) {
  916                 int e;
  917 
  918                 if ((e = nd6_prefix_onlink(new)) != 0) {
  919                         nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
  920                             "the prefix %s/%d on-link on %s (errno=%d)\n",
  921                             ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
  922                             pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  923                         /* proceed anyway. XXX: is it correct? */
  924                 }
  925         }
  926 
  927         if (dr)
  928                 pfxrtr_add(new, dr);
  929 
  930         return 0;
  931 }
  932 
  933 void
  934 prelist_remove(struct nd_prefix *pr)
  935 {
  936         struct nd_pfxrouter *pfr, *next;
  937         int e, s;
  938         char ip6buf[INET6_ADDRSTRLEN];
  939 
  940         /* make sure to invalidate the prefix until it is really freed. */
  941         pr->ndpr_vltime = 0;
  942         pr->ndpr_pltime = 0;
  943 
  944         /*
  945          * Though these flags are now meaningless, we'd rather keep the value
  946          * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users
  947          * when executing "ndp -p".
  948          */
  949 
  950         if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
  951             (e = nd6_prefix_offlink(pr)) != 0) {
  952                 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
  953                     "on %s, errno=%d\n",
  954                     ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
  955                     pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  956                 /* what should we do? */
  957         }
  958 
  959         if (pr->ndpr_refcnt > 0)
  960                 return;         /* notice here? */
  961 
  962         s = splnet();
  963 
  964         /* unlink ndpr_entry from nd_prefix list */
  965         LIST_REMOVE(pr, ndpr_entry);
  966 
  967         /* free list of routers that adversed the prefix */
  968         for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
  969                 next = pfr->pfr_next;
  970 
  971                 free(pfr, M_IP6NDP);
  972         }
  973         splx(s);
  974 
  975         free(pr, M_IP6NDP);
  976 
  977         pfxlist_onlink_check();
  978 }
  979 
  980 /*
  981  * dr - may be NULL
  982  */
  983 
  984 static int
  985 prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
  986     struct mbuf *m, int mcast)
  987 {
  988         struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
  989         struct ifaddr *ifa;
  990         struct ifnet *ifp = new->ndpr_ifp;
  991         struct nd_prefix *pr;
  992         int s = splnet();
  993         int error = 0;
  994         int newprefix = 0;
  995         int auth;
  996         struct in6_addrlifetime lt6_tmp;
  997         char ip6buf[INET6_ADDRSTRLEN];
  998 
  999         auth = 0;
 1000         if (m) {
 1001                 /*
 1002                  * Authenticity for NA consists authentication for
 1003                  * both IP header and IP datagrams, doesn't it ?
 1004                  */
 1005 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
 1006                 auth = ((m->m_flags & M_AUTHIPHDR) &&
 1007                     (m->m_flags & M_AUTHIPDGM));
 1008 #endif
 1009         }
 1010 
 1011         if ((pr = nd6_prefix_lookup(new)) != NULL) {
 1012                 /*
 1013                  * nd6_prefix_lookup() ensures that pr and new have the same
 1014                  * prefix on a same interface.
 1015                  */
 1016 
 1017                 /*
 1018                  * Update prefix information.  Note that the on-link (L) bit
 1019                  * and the autonomous (A) bit should NOT be changed from 1
 1020                  * to 0.
 1021                  */
 1022                 if (new->ndpr_raf_onlink == 1)
 1023                         pr->ndpr_raf_onlink = 1;
 1024                 if (new->ndpr_raf_auto == 1)
 1025                         pr->ndpr_raf_auto = 1;
 1026                 if (new->ndpr_raf_onlink) {
 1027                         pr->ndpr_vltime = new->ndpr_vltime;
 1028                         pr->ndpr_pltime = new->ndpr_pltime;
 1029                         (void)in6_init_prefix_ltimes(pr); /* XXX error case? */
 1030                         pr->ndpr_lastupdate = time_second;
 1031                 }
 1032 
 1033                 if (new->ndpr_raf_onlink &&
 1034                     (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
 1035                         int e;
 1036 
 1037                         if ((e = nd6_prefix_onlink(pr)) != 0) {
 1038                                 nd6log((LOG_ERR,
 1039                                     "prelist_update: failed to make "
 1040                                     "the prefix %s/%d on-link on %s "
 1041                                     "(errno=%d)\n",
 1042                                     ip6_sprintf(ip6buf,
 1043                                             &pr->ndpr_prefix.sin6_addr),
 1044                                     pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
 1045                                 /* proceed anyway. XXX: is it correct? */
 1046                         }
 1047                 }
 1048 
 1049                 if (dr && pfxrtr_lookup(pr, dr) == NULL)
 1050                         pfxrtr_add(pr, dr);
 1051         } else {
 1052                 struct nd_prefix *newpr = NULL;
 1053 
 1054                 newprefix = 1;
 1055 
 1056                 if (new->ndpr_vltime == 0)
 1057                         goto end;
 1058                 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
 1059                         goto end;
 1060 
 1061                 error = nd6_prelist_add(new, dr, &newpr);
 1062                 if (error != 0 || newpr == NULL) {
 1063                         nd6log((LOG_NOTICE, "prelist_update: "
 1064                             "nd6_prelist_add failed for %s/%d on %s "
 1065                             "errno=%d, returnpr=%p\n",
 1066                             ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr),
 1067                             new->ndpr_plen, if_name(new->ndpr_ifp),
 1068                             error, newpr));
 1069                         goto end; /* we should just give up in this case. */
 1070                 }
 1071 
 1072                 /*
 1073                  * XXX: from the ND point of view, we can ignore a prefix
 1074                  * with the on-link bit being zero.  However, we need a
 1075                  * prefix structure for references from autoconfigured
 1076                  * addresses.  Thus, we explicitly make sure that the prefix
 1077                  * itself expires now.
 1078                  */
 1079                 if (newpr->ndpr_raf_onlink == 0) {
 1080                         newpr->ndpr_vltime = 0;
 1081                         newpr->ndpr_pltime = 0;
 1082                         in6_init_prefix_ltimes(newpr);
 1083                 }
 1084 
 1085                 pr = newpr;
 1086         }
 1087 
 1088         /*
 1089          * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
 1090          * Note that pr must be non NULL at this point.
 1091          */
 1092 
 1093         /* 5.5.3 (a). Ignore the prefix without the A bit set. */
 1094         if (!new->ndpr_raf_auto)
 1095                 goto end;
 1096 
 1097         /*
 1098          * 5.5.3 (b). the link-local prefix should have been ignored in
 1099          * nd6_ra_input.
 1100          */
 1101 
 1102         /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */
 1103         if (new->ndpr_pltime > new->ndpr_vltime) {
 1104                 error = EINVAL; /* XXX: won't be used */
 1105                 goto end;
 1106         }
 1107 
 1108         /*
 1109          * 5.5.3 (d).  If the prefix advertised is not equal to the prefix of
 1110          * an address configured by stateless autoconfiguration already in the
 1111          * list of addresses associated with the interface, and the Valid
 1112          * Lifetime is not 0, form an address.  We first check if we have
 1113          * a matching prefix.
 1114          * Note: we apply a clarification in rfc2462bis-02 here.  We only
 1115          * consider autoconfigured addresses while RFC2462 simply said
 1116          * "address".
 1117          */
 1118         IF_ADDR_LOCK(ifp);
 1119         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1120                 struct in6_ifaddr *ifa6;
 1121                 u_int32_t remaininglifetime;
 1122 
 1123                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1124                         continue;
 1125 
 1126                 ifa6 = (struct in6_ifaddr *)ifa;
 1127 
 1128                 /*
 1129                  * We only consider autoconfigured addresses as per rfc2462bis.
 1130                  */
 1131                 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
 1132                         continue;
 1133 
 1134                 /*
 1135                  * Spec is not clear here, but I believe we should concentrate
 1136                  * on unicast (i.e. not anycast) addresses.
 1137                  * XXX: other ia6_flags? detached or duplicated?
 1138                  */
 1139                 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
 1140                         continue;
 1141 
 1142                 /*
 1143                  * Ignore the address if it is not associated with a prefix
 1144                  * or is associated with a prefix that is different from this
 1145                  * one.  (pr is never NULL here)
 1146                  */
 1147                 if (ifa6->ia6_ndpr != pr)
 1148                         continue;
 1149 
 1150                 if (ia6_match == NULL) /* remember the first one */
 1151                         ia6_match = ifa6;
 1152 
 1153                 /*
 1154                  * An already autoconfigured address matched.  Now that we
 1155                  * are sure there is at least one matched address, we can
 1156                  * proceed to 5.5.3. (e): update the lifetimes according to the
 1157                  * "two hours" rule and the privacy extension.
 1158                  * We apply some clarifications in rfc2462bis:
 1159                  * - use remaininglifetime instead of storedlifetime as a
 1160                  *   variable name
 1161                  * - remove the dead code in the "two-hour" rule
 1162                  */
 1163 #define TWOHOUR         (120*60)
 1164                 lt6_tmp = ifa6->ia6_lifetime;
 1165 
 1166                 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
 1167                         remaininglifetime = ND6_INFINITE_LIFETIME;
 1168                 else if (time_second - ifa6->ia6_updatetime >
 1169                          lt6_tmp.ia6t_vltime) {
 1170                         /*
 1171                          * The case of "invalid" address.  We should usually
 1172                          * not see this case.
 1173                          */
 1174                         remaininglifetime = 0;
 1175                 } else
 1176                         remaininglifetime = lt6_tmp.ia6t_vltime -
 1177                             (time_second - ifa6->ia6_updatetime);
 1178 
 1179                 /* when not updating, keep the current stored lifetime. */
 1180                 lt6_tmp.ia6t_vltime = remaininglifetime;
 1181 
 1182                 if (TWOHOUR < new->ndpr_vltime ||
 1183                     remaininglifetime < new->ndpr_vltime) {
 1184                         lt6_tmp.ia6t_vltime = new->ndpr_vltime;
 1185                 } else if (remaininglifetime <= TWOHOUR) {
 1186                         if (auth) {
 1187                                 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
 1188                         }
 1189                 } else {
 1190                         /*
 1191                          * new->ndpr_vltime <= TWOHOUR &&
 1192                          * TWOHOUR < remaininglifetime
 1193                          */
 1194                         lt6_tmp.ia6t_vltime = TWOHOUR;
 1195                 }
 1196 
 1197                 /* The 2 hour rule is not imposed for preferred lifetime. */
 1198                 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
 1199 
 1200                 in6_init_address_ltimes(pr, &lt6_tmp);
 1201 
 1202                 /*
 1203                  * We need to treat lifetimes for temporary addresses
 1204                  * differently, according to
 1205                  * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
 1206                  * we only update the lifetimes when they are in the maximum
 1207                  * intervals.
 1208                  */
 1209                 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
 1210                         u_int32_t maxvltime, maxpltime;
 1211 
 1212                         if (V_ip6_temp_valid_lifetime >
 1213                             (u_int32_t)((time_second - ifa6->ia6_createtime) +
 1214                             V_ip6_desync_factor)) {
 1215                                 maxvltime = V_ip6_temp_valid_lifetime -
 1216                                     (time_second - ifa6->ia6_createtime) -
 1217                                     V_ip6_desync_factor;
 1218                         } else
 1219                                 maxvltime = 0;
 1220                         if (V_ip6_temp_preferred_lifetime >
 1221                             (u_int32_t)((time_second - ifa6->ia6_createtime) +
 1222                             V_ip6_desync_factor)) {
 1223                                 maxpltime = V_ip6_temp_preferred_lifetime -
 1224                                     (time_second - ifa6->ia6_createtime) -
 1225                                     V_ip6_desync_factor;
 1226                         } else
 1227                                 maxpltime = 0;
 1228 
 1229                         if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
 1230                             lt6_tmp.ia6t_vltime > maxvltime) {
 1231                                 lt6_tmp.ia6t_vltime = maxvltime;
 1232                         }
 1233                         if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
 1234                             lt6_tmp.ia6t_pltime > maxpltime) {
 1235                                 lt6_tmp.ia6t_pltime = maxpltime;
 1236                         }
 1237                 }
 1238                 ifa6->ia6_lifetime = lt6_tmp;
 1239                 ifa6->ia6_updatetime = time_second;
 1240         }
 1241         IF_ADDR_UNLOCK(ifp);
 1242         if (ia6_match == NULL && new->ndpr_vltime) {
 1243                 int ifidlen;
 1244 
 1245                 /*
 1246                  * 5.5.3 (d) (continued)
 1247                  * No address matched and the valid lifetime is non-zero.
 1248                  * Create a new address.
 1249                  */
 1250 
 1251                 /*
 1252                  * Prefix Length check:
 1253                  * If the sum of the prefix length and interface identifier
 1254                  * length does not equal 128 bits, the Prefix Information
 1255                  * option MUST be ignored.  The length of the interface
 1256                  * identifier is defined in a separate link-type specific
 1257                  * document.
 1258                  */
 1259                 ifidlen = in6_if2idlen(ifp);
 1260                 if (ifidlen < 0) {
 1261                         /* this should not happen, so we always log it. */
 1262                         log(LOG_ERR, "prelist_update: IFID undefined (%s)\n",
 1263                             if_name(ifp));
 1264                         goto end;
 1265                 }
 1266                 if (ifidlen + pr->ndpr_plen != 128) {
 1267                         nd6log((LOG_INFO,
 1268                             "prelist_update: invalid prefixlen "
 1269                             "%d for %s, ignored\n",
 1270                             pr->ndpr_plen, if_name(ifp)));
 1271                         goto end;
 1272                 }
 1273 
 1274                 if ((ia6 = in6_ifadd(new, mcast)) != NULL) {
 1275                         /*
 1276                          * note that we should use pr (not new) for reference.
 1277                          */
 1278                         pr->ndpr_refcnt++;
 1279                         ia6->ia6_ndpr = pr;
 1280 
 1281                         /*
 1282                          * RFC 3041 3.3 (2).
 1283                          * When a new public address is created as described
 1284                          * in RFC2462, also create a new temporary address.
 1285                          *
 1286                          * RFC 3041 3.5.
 1287                          * When an interface connects to a new link, a new
 1288                          * randomized interface identifier should be generated
 1289                          * immediately together with a new set of temporary
 1290                          * addresses.  Thus, we specifiy 1 as the 2nd arg of
 1291                          * in6_tmpifadd().
 1292                          */
 1293                         if (V_ip6_use_tempaddr) {
 1294                                 int e;
 1295                                 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
 1296                                         nd6log((LOG_NOTICE, "prelist_update: "
 1297                                             "failed to create a temporary "
 1298                                             "address, errno=%d\n",
 1299                                             e));
 1300                                 }
 1301                         }
 1302                         ifa_free(&ia6->ia_ifa);
 1303 
 1304                         /*
 1305                          * A newly added address might affect the status
 1306                          * of other addresses, so we check and update it.
 1307                          * XXX: what if address duplication happens?
 1308                          */
 1309                         pfxlist_onlink_check();
 1310                 } else {
 1311                         /* just set an error. do not bark here. */
 1312                         error = EADDRNOTAVAIL; /* XXX: might be unused. */
 1313                 }
 1314         }
 1315 
 1316  end:
 1317         splx(s);
 1318         return error;
 1319 }
 1320 
 1321 /*
 1322  * A supplement function used in the on-link detection below;
 1323  * detect if a given prefix has a (probably) reachable advertising router.
 1324  * XXX: lengthy function name...
 1325  */
 1326 static struct nd_pfxrouter *
 1327 find_pfxlist_reachable_router(struct nd_prefix *pr)
 1328 {
 1329         struct nd_pfxrouter *pfxrtr;
 1330         struct llentry *ln;
 1331         int canreach;
 1332 
 1333         for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr != NULL;
 1334              pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
 1335                 IF_AFDATA_LOCK(pfxrtr->router->ifp);
 1336                 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
 1337                 IF_AFDATA_UNLOCK(pfxrtr->router->ifp);
 1338                 if (ln == NULL)
 1339                         continue;
 1340                 canreach = ND6_IS_LLINFO_PROBREACH(ln);
 1341                 LLE_RUNLOCK(ln);
 1342                 if (canreach)
 1343                         break;
 1344         }
 1345         return (pfxrtr);
 1346 }
 1347 
 1348 /*
 1349  * Check if each prefix in the prefix list has at least one available router
 1350  * that advertised the prefix (a router is "available" if its neighbor cache
 1351  * entry is reachable or probably reachable).
 1352  * If the check fails, the prefix may be off-link, because, for example,
 1353  * we have moved from the network but the lifetime of the prefix has not
 1354  * expired yet.  So we should not use the prefix if there is another prefix
 1355  * that has an available router.
 1356  * But, if there is no prefix that has an available router, we still regards
 1357  * all the prefixes as on-link.  This is because we can't tell if all the
 1358  * routers are simply dead or if we really moved from the network and there
 1359  * is no router around us.
 1360  */
 1361 void
 1362 pfxlist_onlink_check()
 1363 {
 1364         struct nd_prefix *pr;
 1365         struct in6_ifaddr *ifa;
 1366         struct nd_defrouter *dr;
 1367         struct nd_pfxrouter *pfxrtr = NULL;
 1368 
 1369         /*
 1370          * Check if there is a prefix that has a reachable advertising
 1371          * router.
 1372          */
 1373         for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 1374                 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
 1375                         break;
 1376         }
 1377 
 1378         /*
 1379          * If we have no such prefix, check whether we still have a router
 1380          * that does not advertise any prefixes.
 1381          */
 1382         if (pr == NULL) {
 1383                 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
 1384                     dr = TAILQ_NEXT(dr, dr_entry)) {
 1385                         struct nd_prefix *pr0;
 1386 
 1387                         for (pr0 = V_nd_prefix.lh_first; pr0;
 1388                             pr0 = pr0->ndpr_next) {
 1389                                 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
 1390                                         break;
 1391                         }
 1392                         if (pfxrtr != NULL)
 1393                                 break;
 1394                 }
 1395         }
 1396         if (pr != NULL || (TAILQ_FIRST(&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                 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 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                 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 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         for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 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 int
 1552 nd6_prefix_onlink(struct nd_prefix *pr)
 1553 {
 1554         struct ifaddr *ifa;
 1555         struct ifnet *ifp = pr->ndpr_ifp;
 1556         struct sockaddr_in6 mask6;
 1557         struct nd_prefix *opr;
 1558         u_long rtflags;
 1559         int error = 0;
 1560         struct radix_node_head *rnh;
 1561         struct rtentry *rt = NULL;
 1562         char ip6buf[INET6_ADDRSTRLEN];
 1563         struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
 1564 
 1565         /* sanity check */
 1566         if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
 1567                 nd6log((LOG_ERR,
 1568                     "nd6_prefix_onlink: %s/%d is already on-link\n",
 1569                     ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
 1570                     pr->ndpr_plen));
 1571                 return (EEXIST);
 1572         }
 1573 
 1574         /*
 1575          * Add the interface route associated with the prefix.  Before
 1576          * installing the route, check if there's the same prefix on another
 1577          * interface, and the prefix has already installed the interface route.
 1578          * Although such a configuration is expected to be rare, we explicitly
 1579          * allow it.
 1580          */
 1581         for (opr = V_nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
 1582                 if (opr == pr)
 1583                         continue;
 1584 
 1585                 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
 1586                         continue;
 1587 
 1588                 if (opr->ndpr_plen == pr->ndpr_plen &&
 1589                     in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
 1590                     &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen))
 1591                         return (0);
 1592         }
 1593 
 1594         /*
 1595          * We prefer link-local addresses as the associated interface address.
 1596          */
 1597         /* search for a link-local addr */
 1598         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
 1599             IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
 1600         if (ifa == NULL) {
 1601                 /* XXX: freebsd does not have ifa_ifwithaf */
 1602                 IF_ADDR_LOCK(ifp);
 1603                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1604                         if (ifa->ifa_addr->sa_family == AF_INET6)
 1605                                 break;
 1606                 }
 1607                 if (ifa != NULL)
 1608                         ifa_ref(ifa);
 1609                 IF_ADDR_UNLOCK(ifp);
 1610                 /* should we care about ia6_flags? */
 1611         }
 1612         if (ifa == NULL) {
 1613                 /*
 1614                  * This can still happen, when, for example, we receive an RA
 1615                  * containing a prefix with the L bit set and the A bit clear,
 1616                  * after removing all IPv6 addresses on the receiving
 1617                  * interface.  This should, of course, be rare though.
 1618                  */
 1619                 nd6log((LOG_NOTICE,
 1620                     "nd6_prefix_onlink: failed to find any ifaddr"
 1621                     " to add route for a prefix(%s/%d) on %s\n",
 1622                     ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
 1623                     pr->ndpr_plen, if_name(ifp)));
 1624                 return (0);
 1625         }
 1626 
 1627         /*
 1628          * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
 1629          * ifa->ifa_rtrequest = nd6_rtrequest;
 1630          */
 1631         bzero(&mask6, sizeof(mask6));
 1632         mask6.sin6_len = sizeof(mask6);
 1633         mask6.sin6_addr = pr->ndpr_mask;
 1634         rtflags = ifa->ifa_flags | RTF_UP;
 1635         error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
 1636             ifa->ifa_addr, (struct sockaddr *)&mask6, rtflags, &rt);
 1637         if (error == 0) {
 1638                 if (rt != NULL) /* this should be non NULL, though */ {
 1639                         rnh = rt_tables_get_rnh(rt->rt_fibnum, AF_INET6);
 1640                         /* XXX what if rhn == NULL? */
 1641                         RADIX_NODE_HEAD_LOCK(rnh);
 1642                         RT_LOCK(rt);
 1643                         if (!rt_setgate(rt, rt_key(rt), (struct sockaddr *)&null_sdl)) {
 1644                                 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type =
 1645                                         rt->rt_ifp->if_type;
 1646                                 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index =
 1647                                         rt->rt_ifp->if_index;
 1648                         }
 1649                         RADIX_NODE_HEAD_UNLOCK(rnh);
 1650                         nd6_rtmsg(RTM_ADD, rt);
 1651                         RT_UNLOCK(rt);
 1652                 }
 1653                 pr->ndpr_stateflags |= NDPRF_ONLINK;
 1654         } else {
 1655                 char ip6bufg[INET6_ADDRSTRLEN], ip6bufm[INET6_ADDRSTRLEN];
 1656                 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
 1657                     " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
 1658                     "errno = %d\n",
 1659                     ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
 1660                     pr->ndpr_plen, if_name(ifp),
 1661                     ip6_sprintf(ip6bufg, &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
 1662                     ip6_sprintf(ip6bufm, &mask6.sin6_addr), rtflags, error));
 1663         }
 1664 
 1665         if (rt != NULL) {
 1666                 RT_LOCK(rt);
 1667                 RT_REMREF(rt);
 1668                 RT_UNLOCK(rt);
 1669         }
 1670         if (ifa != NULL)
 1671                 ifa_free(ifa);
 1672 
 1673         return (error);
 1674 }
 1675 
 1676 int
 1677 nd6_prefix_offlink(struct nd_prefix *pr)
 1678 {
 1679         int error = 0;
 1680         struct ifnet *ifp = pr->ndpr_ifp;
 1681         struct nd_prefix *opr;
 1682         struct sockaddr_in6 sa6, mask6;
 1683         struct rtentry *rt = NULL;
 1684         char ip6buf[INET6_ADDRSTRLEN];
 1685 
 1686         /* sanity check */
 1687         if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
 1688                 nd6log((LOG_ERR,
 1689                     "nd6_prefix_offlink: %s/%d is already off-link\n",
 1690                     ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
 1691                     pr->ndpr_plen));
 1692                 return (EEXIST);
 1693         }
 1694 
 1695         bzero(&sa6, sizeof(sa6));
 1696         sa6.sin6_family = AF_INET6;
 1697         sa6.sin6_len = sizeof(sa6);
 1698         bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
 1699             sizeof(struct in6_addr));
 1700         bzero(&mask6, sizeof(mask6));
 1701         mask6.sin6_family = AF_INET6;
 1702         mask6.sin6_len = sizeof(sa6);
 1703         bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
 1704         error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
 1705             (struct sockaddr *)&mask6, 0, &rt);
 1706         if (error == 0) {
 1707                 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
 1708 
 1709                 /* report the route deletion to the routing socket. */
 1710                 if (rt != NULL)
 1711                         nd6_rtmsg(RTM_DELETE, rt);
 1712 
 1713                 /*
 1714                  * There might be the same prefix on another interface,
 1715                  * the prefix which could not be on-link just because we have
 1716                  * the interface route (see comments in nd6_prefix_onlink).
 1717                  * If there's one, try to make the prefix on-link on the
 1718                  * interface.
 1719                  */
 1720                 for (opr = V_nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
 1721                         if (opr == pr)
 1722                                 continue;
 1723 
 1724                         if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
 1725                                 continue;
 1726 
 1727                         /*
 1728                          * KAME specific: detached prefixes should not be
 1729                          * on-link.
 1730                          */
 1731                         if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
 1732                                 continue;
 1733 
 1734                         if (opr->ndpr_plen == pr->ndpr_plen &&
 1735                             in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
 1736                             &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
 1737                                 int e;
 1738 
 1739                                 if ((e = nd6_prefix_onlink(opr)) != 0) {
 1740                                         nd6log((LOG_ERR,
 1741                                             "nd6_prefix_offlink: failed to "
 1742                                             "recover a prefix %s/%d from %s "
 1743                                             "to %s (errno = %d)\n",
 1744                                             ip6_sprintf(ip6buf,
 1745                                                 &opr->ndpr_prefix.sin6_addr),
 1746                                             opr->ndpr_plen, if_name(ifp),
 1747                                             if_name(opr->ndpr_ifp), e));
 1748                                 }
 1749                         }
 1750                 }
 1751         } else {
 1752                 /* XXX: can we still set the NDPRF_ONLINK flag? */
 1753                 nd6log((LOG_ERR,
 1754                     "nd6_prefix_offlink: failed to delete route: "
 1755                     "%s/%d on %s (errno = %d)\n",
 1756                     ip6_sprintf(ip6buf, &sa6.sin6_addr), pr->ndpr_plen,
 1757                     if_name(ifp), error));
 1758         }
 1759 
 1760         if (rt != NULL) {
 1761                 RTFREE(rt);
 1762         }
 1763 
 1764         return (error);
 1765 }
 1766 
 1767 static struct in6_ifaddr *
 1768 in6_ifadd(struct nd_prefixctl *pr, int mcast)
 1769 {
 1770         struct ifnet *ifp = pr->ndpr_ifp;
 1771         struct ifaddr *ifa;
 1772         struct in6_aliasreq ifra;
 1773         struct in6_ifaddr *ia, *ib;
 1774         int error, plen0;
 1775         struct in6_addr mask;
 1776         int prefixlen = pr->ndpr_plen;
 1777         int updateflags;
 1778         char ip6buf[INET6_ADDRSTRLEN];
 1779 
 1780         in6_prefixlen2mask(&mask, prefixlen);
 1781 
 1782         /*
 1783          * find a link-local address (will be interface ID).
 1784          * Is it really mandatory? Theoretically, a global or a site-local
 1785          * address can be configured without a link-local address, if we
 1786          * have a unique interface identifier...
 1787          *
 1788          * it is not mandatory to have a link-local address, we can generate
 1789          * interface identifier on the fly.  we do this because:
 1790          * (1) it should be the easiest way to find interface identifier.
 1791          * (2) RFC2462 5.4 suggesting the use of the same interface identifier
 1792          * for multiple addresses on a single interface, and possible shortcut
 1793          * of DAD.  we omitted DAD for this reason in the past.
 1794          * (3) a user can prevent autoconfiguration of global address
 1795          * by removing link-local address by hand (this is partly because we
 1796          * don't have other way to control the use of IPv6 on an interface.
 1797          * this has been our design choice - cf. NRL's "ifconfig auto").
 1798          * (4) it is easier to manage when an interface has addresses
 1799          * with the same interface identifier, than to have multiple addresses
 1800          * with different interface identifiers.
 1801          */
 1802         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
 1803         if (ifa)
 1804                 ib = (struct in6_ifaddr *)ifa;
 1805         else
 1806                 return NULL;
 1807 
 1808         /* prefixlen + ifidlen must be equal to 128 */
 1809         plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
 1810         if (prefixlen != plen0) {
 1811                 ifa_free(ifa);
 1812                 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
 1813                     "(prefix=%d ifid=%d)\n",
 1814                     if_name(ifp), prefixlen, 128 - plen0));
 1815                 return NULL;
 1816         }
 1817 
 1818         /* make ifaddr */
 1819 
 1820         bzero(&ifra, sizeof(ifra));
 1821         /*
 1822          * in6_update_ifa() does not use ifra_name, but we accurately set it
 1823          * for safety.
 1824          */
 1825         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
 1826         ifra.ifra_addr.sin6_family = AF_INET6;
 1827         ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
 1828         /* prefix */
 1829         ifra.ifra_addr.sin6_addr = pr->ndpr_prefix.sin6_addr;
 1830         ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
 1831         ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
 1832         ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
 1833         ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
 1834 
 1835         /* interface ID */
 1836         ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
 1837             (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
 1838         ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
 1839             (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
 1840         ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
 1841             (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
 1842         ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
 1843             (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
 1844         ifa_free(ifa);
 1845 
 1846         /* new prefix mask. */
 1847         ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
 1848         ifra.ifra_prefixmask.sin6_family = AF_INET6;
 1849         bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
 1850             sizeof(ifra.ifra_prefixmask.sin6_addr));
 1851 
 1852         /* lifetimes. */
 1853         ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
 1854         ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
 1855 
 1856         /* XXX: scope zone ID? */
 1857 
 1858         ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
 1859 
 1860         /*
 1861          * Make sure that we do not have this address already.  This should
 1862          * usually not happen, but we can still see this case, e.g., if we
 1863          * have manually configured the exact address to be configured.
 1864          */
 1865         ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
 1866             &ifra.ifra_addr.sin6_addr);
 1867         if (ifa != NULL) {
 1868                 ifa_free(ifa);
 1869                 /* this should be rare enough to make an explicit log */
 1870                 log(LOG_INFO, "in6_ifadd: %s is already configured\n",
 1871                     ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr));
 1872                 return (NULL);
 1873         }
 1874 
 1875         /*
 1876          * Allocate ifaddr structure, link into chain, etc.
 1877          * If we are going to create a new address upon receiving a multicasted
 1878          * RA, we need to impose a random delay before starting DAD.
 1879          * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2]
 1880          */
 1881         updateflags = 0;
 1882         if (mcast)
 1883                 updateflags |= IN6_IFAUPDATE_DADDELAY;
 1884         if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) {
 1885                 nd6log((LOG_ERR,
 1886                     "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
 1887                     ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr),
 1888                     if_name(ifp), error));
 1889                 return (NULL);  /* ifaddr must not have been allocated. */
 1890         }
 1891 
 1892         ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
 1893         /*
 1894          * XXXRW: Assumption of non-NULLness here might not be true with
 1895          * fine-grained locking -- should we validate it?  Or just return
 1896          * earlier ifa rather than looking it up again?
 1897          */
 1898         return (ia);            /* this is always non-NULL  and referenced. */
 1899 }
 1900 
 1901 /*
 1902  * ia0 - corresponding public address
 1903  */
 1904 int
 1905 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay)
 1906 {
 1907         struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
 1908         struct in6_ifaddr *newia, *ia;
 1909         struct in6_aliasreq ifra;
 1910         int i, error;
 1911         int trylimit = 3;       /* XXX: adhoc value */
 1912         int updateflags;
 1913         u_int32_t randid[2];
 1914         time_t vltime0, pltime0;
 1915 
 1916         bzero(&ifra, sizeof(ifra));
 1917         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
 1918         ifra.ifra_addr = ia0->ia_addr;
 1919         /* copy prefix mask */
 1920         ifra.ifra_prefixmask = ia0->ia_prefixmask;
 1921         /* clear the old IFID */
 1922         for (i = 0; i < 4; i++) {
 1923                 ifra.ifra_addr.sin6_addr.s6_addr32[i] &=
 1924                     ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
 1925         }
 1926 
 1927   again:
 1928         if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
 1929             (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) {
 1930                 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good "
 1931                     "random IFID\n"));
 1932                 return (EINVAL);
 1933         }
 1934         ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
 1935             (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
 1936         ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
 1937             (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
 1938 
 1939         /*
 1940          * in6_get_tmpifid() quite likely provided a unique interface ID.
 1941          * However, we may still have a chance to see collision, because
 1942          * there may be a time lag between generation of the ID and generation
 1943          * of the address.  So, we'll do one more sanity check.
 1944          */
 1945         IN6_IFADDR_RLOCK();
 1946         TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
 1947                 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
 1948                     &ifra.ifra_addr.sin6_addr)) {
 1949                         if (trylimit-- == 0) {
 1950                                 IN6_IFADDR_RUNLOCK();
 1951                                 /*
 1952                                  * Give up.  Something strange should have
 1953                                  * happened.
 1954                                  */
 1955                                 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to "
 1956                                     "find a unique random IFID\n"));
 1957                                 return (EEXIST);
 1958                         }
 1959                         IN6_IFADDR_RUNLOCK();
 1960                         forcegen = 1;
 1961                         goto again;
 1962                 }
 1963         }
 1964         IN6_IFADDR_RUNLOCK();
 1965 
 1966         /*
 1967          * The Valid Lifetime is the lower of the Valid Lifetime of the
 1968          * public address or TEMP_VALID_LIFETIME.
 1969          * The Preferred Lifetime is the lower of the Preferred Lifetime
 1970          * of the public address or TEMP_PREFERRED_LIFETIME -
 1971          * DESYNC_FACTOR.
 1972          */
 1973         if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
 1974                 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
 1975                     (ia0->ia6_lifetime.ia6t_vltime -
 1976                     (time_second - ia0->ia6_updatetime));
 1977                 if (vltime0 > V_ip6_temp_valid_lifetime)
 1978                         vltime0 = V_ip6_temp_valid_lifetime;
 1979         } else
 1980                 vltime0 = V_ip6_temp_valid_lifetime;
 1981         if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
 1982                 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
 1983                     (ia0->ia6_lifetime.ia6t_pltime -
 1984                     (time_second - ia0->ia6_updatetime));
 1985                 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){
 1986                         pltime0 = V_ip6_temp_preferred_lifetime -
 1987                             V_ip6_desync_factor;
 1988                 }
 1989         } else
 1990                 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor;
 1991         ifra.ifra_lifetime.ia6t_vltime = vltime0;
 1992         ifra.ifra_lifetime.ia6t_pltime = pltime0;
 1993 
 1994         /*
 1995          * A temporary address is created only if this calculated Preferred
 1996          * Lifetime is greater than REGEN_ADVANCE time units.
 1997          */
 1998         if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance)
 1999                 return (0);
 2000 
 2001         /* XXX: scope zone ID? */
 2002 
 2003         ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
 2004 
 2005         /* allocate ifaddr structure, link into chain, etc. */
 2006         updateflags = 0;
 2007         if (delay)
 2008                 updateflags |= IN6_IFAUPDATE_DADDELAY;
 2009         if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0)
 2010                 return (error);
 2011 
 2012         newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
 2013         if (newia == NULL) {    /* XXX: can it happen? */
 2014                 nd6log((LOG_ERR,
 2015                     "in6_tmpifadd: ifa update succeeded, but we got "
 2016                     "no ifaddr\n"));
 2017                 return (EINVAL); /* XXX */
 2018         }
 2019         newia->ia6_ndpr = ia0->ia6_ndpr;
 2020         newia->ia6_ndpr->ndpr_refcnt++;
 2021         ifa_free(&newia->ia_ifa);
 2022 
 2023         /*
 2024          * A newly added address might affect the status of other addresses.
 2025          * XXX: when the temporary address is generated with a new public
 2026          * address, the onlink check is redundant.  However, it would be safe
 2027          * to do the check explicitly everywhere a new address is generated,
 2028          * and, in fact, we surely need the check when we create a new
 2029          * temporary address due to deprecation of an old temporary address.
 2030          */
 2031         pfxlist_onlink_check();
 2032 
 2033         return (0);
 2034 }
 2035 
 2036 static int
 2037 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
 2038 {
 2039         if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
 2040                 ndpr->ndpr_preferred = 0;
 2041         else
 2042                 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime;
 2043         if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
 2044                 ndpr->ndpr_expire = 0;
 2045         else
 2046                 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime;
 2047 
 2048         return 0;
 2049 }
 2050 
 2051 static void
 2052 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
 2053 {
 2054         /* init ia6t_expire */
 2055         if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
 2056                 lt6->ia6t_expire = 0;
 2057         else {
 2058                 lt6->ia6t_expire = time_second;
 2059                 lt6->ia6t_expire += lt6->ia6t_vltime;
 2060         }
 2061 
 2062         /* init ia6t_preferred */
 2063         if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
 2064                 lt6->ia6t_preferred = 0;
 2065         else {
 2066                 lt6->ia6t_preferred = time_second;
 2067                 lt6->ia6t_preferred += lt6->ia6t_pltime;
 2068         }
 2069 }
 2070 
 2071 /*
 2072  * Delete all the routing table entries that use the specified gateway.
 2073  * XXX: this function causes search through all entries of routing table, so
 2074  * it shouldn't be called when acting as a router.
 2075  */
 2076 void
 2077 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
 2078 {
 2079         struct radix_node_head *rnh;
 2080         int s = splnet();
 2081 
 2082         /* We'll care only link-local addresses */
 2083         if (!IN6_IS_ADDR_LINKLOCAL(gateway)) {
 2084                 splx(s);
 2085                 return;
 2086         }
 2087 
 2088         rnh = rt_tables_get_rnh(0, AF_INET6);
 2089         if (rnh == NULL)
 2090                 return;
 2091 
 2092         RADIX_NODE_HEAD_LOCK(rnh);
 2093         rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
 2094         RADIX_NODE_HEAD_UNLOCK(rnh);
 2095         splx(s);
 2096 }
 2097 
 2098 static int
 2099 rt6_deleteroute(struct radix_node *rn, void *arg)
 2100 {
 2101 #define SIN6(s) ((struct sockaddr_in6 *)s)
 2102         struct rtentry *rt = (struct rtentry *)rn;
 2103         struct in6_addr *gate = (struct in6_addr *)arg;
 2104 
 2105         if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
 2106                 return (0);
 2107 
 2108         if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) {
 2109                 return (0);
 2110         }
 2111 
 2112         /*
 2113          * Do not delete a static route.
 2114          * XXX: this seems to be a bit ad-hoc. Should we consider the
 2115          * 'cloned' bit instead?
 2116          */
 2117         if ((rt->rt_flags & RTF_STATIC) != 0)
 2118                 return (0);
 2119 
 2120         /*
 2121          * We delete only host route. This means, in particular, we don't
 2122          * delete default route.
 2123          */
 2124         if ((rt->rt_flags & RTF_HOST) == 0)
 2125                 return (0);
 2126 
 2127         return (rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
 2128             rt_mask(rt), rt->rt_flags, 0));
 2129 #undef SIN6
 2130 }
 2131 
 2132 int
 2133 nd6_setdefaultiface(int ifindex)
 2134 {
 2135         int error = 0;
 2136 
 2137         if (ifindex < 0 || V_if_index < ifindex)
 2138                 return (EINVAL);
 2139         if (ifindex != 0 && !ifnet_byindex(ifindex))
 2140                 return (EINVAL);
 2141 
 2142         if (V_nd6_defifindex != ifindex) {
 2143                 V_nd6_defifindex = ifindex;
 2144                 if (V_nd6_defifindex > 0)
 2145                         V_nd6_defifp = ifnet_byindex(V_nd6_defifindex);
 2146                 else
 2147                         V_nd6_defifp = NULL;
 2148 
 2149                 /*
 2150                  * Our current implementation assumes one-to-one maping between
 2151                  * interfaces and links, so it would be natural to use the
 2152                  * default interface as the default link.
 2153                  */
 2154                 scope6_setdefault(V_nd6_defifp);
 2155         }
 2156 
 2157         return (error);
 2158 }

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