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/10.2/sys/netinet6/nd6_rtr.c 281230 2015-04-07 20:20:24Z delphij $");
   34 
   35 #include "opt_inet.h"
   36 #include "opt_inet6.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/malloc.h>
   41 #include <sys/mbuf.h>
   42 #include <sys/socket.h>
   43 #include <sys/sockio.h>
   44 #include <sys/time.h>
   45 #include <sys/kernel.h>
   46 #include <sys/lock.h>
   47 #include <sys/errno.h>
   48 #include <sys/rwlock.h>
   49 #include <sys/syslog.h>
   50 #include <sys/queue.h>
   51 
   52 #include <net/if.h>
   53 #include <net/if_types.h>
   54 #include <net/if_dl.h>
   55 #include <net/route.h>
   56 #include <net/radix.h>
   57 #include <net/vnet.h>
   58 
   59 #include <netinet/in.h>
   60 #include <net/if_llatbl.h>
   61 #include <netinet6/in6_var.h>
   62 #include <netinet6/in6_ifattach.h>
   63 #include <netinet/ip6.h>
   64 #include <netinet6/ip6_var.h>
   65 #include <netinet6/nd6.h>
   66 #include <netinet/icmp6.h>
   67 #include <netinet6/scope6_var.h>
   68 
   69 static int rtpref(struct nd_defrouter *);
   70 static struct nd_defrouter *defrtrlist_update(struct nd_defrouter *);
   71 static int prelist_update(struct nd_prefixctl *, struct nd_defrouter *,
   72     struct mbuf *, int);
   73 static struct in6_ifaddr *in6_ifadd(struct nd_prefixctl *, int);
   74 static struct nd_pfxrouter *pfxrtr_lookup(struct nd_prefix *,
   75         struct nd_defrouter *);
   76 static void pfxrtr_add(struct nd_prefix *, struct nd_defrouter *);
   77 static void pfxrtr_del(struct nd_pfxrouter *);
   78 static struct nd_pfxrouter *find_pfxlist_reachable_router
   79 (struct nd_prefix *);
   80 static void defrouter_delreq(struct nd_defrouter *);
   81 static void nd6_rtmsg(int, struct rtentry *);
   82 
   83 static int in6_init_prefix_ltimes(struct nd_prefix *);
   84 static void in6_init_address_ltimes(struct nd_prefix *,
   85         struct in6_addrlifetime *);
   86 
   87 static int nd6_prefix_onlink(struct nd_prefix *);
   88 static int nd6_prefix_offlink(struct nd_prefix *);
   89 
   90 static int rt6_deleteroute(struct radix_node *, void *);
   91 
   92 VNET_DECLARE(int, nd6_recalc_reachtm_interval);
   93 #define V_nd6_recalc_reachtm_interval   VNET(nd6_recalc_reachtm_interval)
   94 
   95 static VNET_DEFINE(struct ifnet *, nd6_defifp);
   96 VNET_DEFINE(int, nd6_defifindex);
   97 #define V_nd6_defifp                    VNET(nd6_defifp)
   98 
   99 VNET_DEFINE(int, ip6_use_tempaddr) = 0;
  100 
  101 VNET_DEFINE(int, ip6_desync_factor);
  102 VNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime) = DEF_TEMP_PREFERRED_LIFETIME;
  103 VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime) = DEF_TEMP_VALID_LIFETIME;
  104 
  105 VNET_DEFINE(int, ip6_temp_regen_advance) = TEMPADDR_REGEN_ADVANCE;
  106 
  107 /* RTPREF_MEDIUM has to be 0! */
  108 #define RTPREF_HIGH     1
  109 #define RTPREF_MEDIUM   0
  110 #define RTPREF_LOW      (-1)
  111 #define RTPREF_RESERVED (-2)
  112 #define RTPREF_INVALID  (-3)    /* internal */
  113 
  114 /*
  115  * Receive Router Solicitation Message - just for routers.
  116  * Router solicitation/advertisement is mostly managed by userland program
  117  * (rtadvd) so here we have no function like nd6_ra_output().
  118  *
  119  * Based on RFC 2461
  120  */
  121 void
  122 nd6_rs_input(struct mbuf *m, int off, int icmp6len)
  123 {
  124         struct ifnet *ifp = m->m_pkthdr.rcvif;
  125         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  126         struct nd_router_solicit *nd_rs;
  127         struct in6_addr saddr6 = ip6->ip6_src;
  128         char *lladdr = NULL;
  129         int lladdrlen = 0;
  130         union nd_opts ndopts;
  131         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
  132 
  133         /*
  134          * Accept RS only when V_ip6_forwarding=1 and the interface has
  135          * no ND6_IFF_ACCEPT_RTADV.
  136          */
  137         if (!V_ip6_forwarding || ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV)
  138                 goto freeit;
  139 
  140         /* Sanity checks */
  141         if (ip6->ip6_hlim != 255) {
  142                 nd6log((LOG_ERR,
  143                     "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
  144                     ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
  145                     ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
  146                 goto bad;
  147         }
  148 
  149         /*
  150          * Don't update the neighbor cache, if src = ::.
  151          * This indicates that the src has no IP address assigned yet.
  152          */
  153         if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
  154                 goto freeit;
  155 
  156 #ifndef PULLDOWN_TEST
  157         IP6_EXTHDR_CHECK(m, off, icmp6len,);
  158         nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
  159 #else
  160         IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
  161         if (nd_rs == NULL) {
  162                 ICMP6STAT_INC(icp6s_tooshort);
  163                 return;
  164         }
  165 #endif
  166 
  167         icmp6len -= sizeof(*nd_rs);
  168         nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
  169         if (nd6_options(&ndopts) < 0) {
  170                 nd6log((LOG_INFO,
  171                     "nd6_rs_input: invalid ND option, ignored\n"));
  172                 /* nd6_options have incremented stats */
  173                 goto freeit;
  174         }
  175 
  176         if (ndopts.nd_opts_src_lladdr) {
  177                 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
  178                 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
  179         }
  180 
  181         if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
  182                 nd6log((LOG_INFO,
  183                     "nd6_rs_input: lladdrlen mismatch for %s "
  184                     "(if %d, RS packet %d)\n",
  185                     ip6_sprintf(ip6bufs, &saddr6),
  186                     ifp->if_addrlen, lladdrlen - 2));
  187                 goto bad;
  188         }
  189 
  190         nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
  191 
  192  freeit:
  193         m_freem(m);
  194         return;
  195 
  196  bad:
  197         ICMP6STAT_INC(icp6s_badrs);
  198         m_freem(m);
  199 }
  200 
  201 /*
  202  * Receive Router Advertisement Message.
  203  *
  204  * Based on RFC 2461
  205  * TODO: on-link bit on prefix information
  206  * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
  207  */
  208 void
  209 nd6_ra_input(struct mbuf *m, int off, int icmp6len)
  210 {
  211         struct ifnet *ifp = m->m_pkthdr.rcvif;
  212         struct nd_ifinfo *ndi = ND_IFINFO(ifp);
  213         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  214         struct nd_router_advert *nd_ra;
  215         struct in6_addr saddr6 = ip6->ip6_src;
  216         int mcast = 0;
  217         union nd_opts ndopts;
  218         struct nd_defrouter *dr;
  219         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
  220 
  221         /*
  222          * We only accept RAs only when the per-interface flag
  223          * ND6_IFF_ACCEPT_RTADV is on the receiving interface.
  224          */
  225         if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
  226                 goto freeit;
  227 
  228         if (ip6->ip6_hlim != 255) {
  229                 nd6log((LOG_ERR,
  230                     "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
  231                     ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
  232                     ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
  233                 goto bad;
  234         }
  235 
  236         if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
  237                 nd6log((LOG_ERR,
  238                     "nd6_ra_input: src %s is not link-local\n",
  239                     ip6_sprintf(ip6bufs, &saddr6)));
  240                 goto bad;
  241         }
  242 
  243 #ifndef PULLDOWN_TEST
  244         IP6_EXTHDR_CHECK(m, off, icmp6len,);
  245         nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
  246 #else
  247         IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
  248         if (nd_ra == NULL) {
  249                 ICMP6STAT_INC(icp6s_tooshort);
  250                 return;
  251         }
  252 #endif
  253 
  254         icmp6len -= sizeof(*nd_ra);
  255         nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
  256         if (nd6_options(&ndopts) < 0) {
  257                 nd6log((LOG_INFO,
  258                     "nd6_ra_input: invalid ND option, ignored\n"));
  259                 /* nd6_options have incremented stats */
  260                 goto freeit;
  261         }
  262 
  263     {
  264         struct nd_defrouter dr0;
  265         u_int32_t advreachable = nd_ra->nd_ra_reachable;
  266 
  267         /* remember if this is a multicasted advertisement */
  268         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
  269                 mcast = 1;
  270 
  271         bzero(&dr0, sizeof(dr0));
  272         dr0.rtaddr = saddr6;
  273         dr0.flags  = nd_ra->nd_ra_flags_reserved;
  274         /*
  275          * Effectively-disable routes from RA messages when
  276          * ND6_IFF_NO_RADR enabled on the receiving interface or
  277          * (ip6.forwarding == 1 && ip6.rfc6204w3 != 1).
  278          */
  279         if (ndi->flags & ND6_IFF_NO_RADR)
  280                 dr0.rtlifetime = 0;
  281         else if (V_ip6_forwarding && !V_ip6_rfc6204w3)
  282                 dr0.rtlifetime = 0;
  283         else
  284                 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
  285         dr0.expire = time_uptime + dr0.rtlifetime;
  286         dr0.ifp = ifp;
  287         /* unspecified or not? (RFC 2461 6.3.4) */
  288         if (advreachable) {
  289                 advreachable = ntohl(advreachable);
  290                 if (advreachable <= MAX_REACHABLE_TIME &&
  291                     ndi->basereachable != advreachable) {
  292                         ndi->basereachable = advreachable;
  293                         ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
  294                         ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */
  295                 }
  296         }
  297         if (nd_ra->nd_ra_retransmit)
  298                 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
  299         if (nd_ra->nd_ra_curhoplimit) {
  300                 if (ndi->chlim < nd_ra->nd_ra_curhoplimit)
  301                         ndi->chlim = nd_ra->nd_ra_curhoplimit;
  302                 else if (ndi->chlim != nd_ra->nd_ra_curhoplimit) {
  303                         log(LOG_ERR, "RA with a lower CurHopLimit sent from "
  304                             "%s on %s (current = %d, received = %d). "
  305                             "Ignored.\n", ip6_sprintf(ip6bufs, &ip6->ip6_src),
  306                             if_name(ifp), ndi->chlim, nd_ra->nd_ra_curhoplimit);
  307                 }
  308         }
  309         dr = defrtrlist_update(&dr0);
  310     }
  311 
  312         /*
  313          * prefix
  314          */
  315         if (ndopts.nd_opts_pi) {
  316                 struct nd_opt_hdr *pt;
  317                 struct nd_opt_prefix_info *pi = NULL;
  318                 struct nd_prefixctl pr;
  319 
  320                 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
  321                      pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
  322                      pt = (struct nd_opt_hdr *)((caddr_t)pt +
  323                                                 (pt->nd_opt_len << 3))) {
  324                         if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
  325                                 continue;
  326                         pi = (struct nd_opt_prefix_info *)pt;
  327 
  328                         if (pi->nd_opt_pi_len != 4) {
  329                                 nd6log((LOG_INFO,
  330                                     "nd6_ra_input: invalid option "
  331                                     "len %d for prefix information option, "
  332                                     "ignored\n", pi->nd_opt_pi_len));
  333                                 continue;
  334                         }
  335 
  336                         if (128 < pi->nd_opt_pi_prefix_len) {
  337                                 nd6log((LOG_INFO,
  338                                     "nd6_ra_input: invalid prefix "
  339                                     "len %d for prefix information option, "
  340                                     "ignored\n", pi->nd_opt_pi_prefix_len));
  341                                 continue;
  342                         }
  343 
  344                         if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
  345                          || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
  346                                 nd6log((LOG_INFO,
  347                                     "nd6_ra_input: invalid prefix "
  348                                     "%s, ignored\n",
  349                                     ip6_sprintf(ip6bufs,
  350                                         &pi->nd_opt_pi_prefix)));
  351                                 continue;
  352                         }
  353 
  354                         bzero(&pr, sizeof(pr));
  355                         pr.ndpr_prefix.sin6_family = AF_INET6;
  356                         pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
  357                         pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
  358                         pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
  359 
  360                         pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
  361                             ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
  362                         pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
  363                             ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
  364                         pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
  365                         pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
  366                         pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
  367                         (void)prelist_update(&pr, dr, m, mcast);
  368                 }
  369         }
  370 
  371         /*
  372          * MTU
  373          */
  374         if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
  375                 u_long mtu;
  376                 u_long maxmtu;
  377 
  378                 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
  379 
  380                 /* lower bound */
  381                 if (mtu < IPV6_MMTU) {
  382                         nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
  383                             "mtu=%lu sent from %s, ignoring\n",
  384                             mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src)));
  385                         goto skip;
  386                 }
  387 
  388                 /* upper bound */
  389                 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
  390                     ? ndi->maxmtu : ifp->if_mtu;
  391                 if (mtu <= maxmtu) {
  392                         int change = (ndi->linkmtu != mtu);
  393 
  394                         ndi->linkmtu = mtu;
  395                         if (change) /* in6_maxmtu may change */
  396                                 in6_setmaxmtu();
  397                 } else {
  398                         nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
  399                             "mtu=%lu sent from %s; "
  400                             "exceeds maxmtu %lu, ignoring\n",
  401                             mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu));
  402                 }
  403         }
  404 
  405  skip:
  406 
  407         /*
  408          * Source link layer address
  409          */
  410     {
  411         char *lladdr = NULL;
  412         int lladdrlen = 0;
  413 
  414         if (ndopts.nd_opts_src_lladdr) {
  415                 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
  416                 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
  417         }
  418 
  419         if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
  420                 nd6log((LOG_INFO,
  421                     "nd6_ra_input: lladdrlen mismatch for %s "
  422                     "(if %d, RA packet %d)\n", ip6_sprintf(ip6bufs, &saddr6),
  423                     ifp->if_addrlen, lladdrlen - 2));
  424                 goto bad;
  425         }
  426 
  427         nd6_cache_lladdr(ifp, &saddr6, lladdr,
  428             lladdrlen, ND_ROUTER_ADVERT, 0);
  429 
  430         /*
  431          * Installing a link-layer address might change the state of the
  432          * router's neighbor cache, which might also affect our on-link
  433          * detection of adveritsed prefixes.
  434          */
  435         pfxlist_onlink_check();
  436     }
  437 
  438  freeit:
  439         m_freem(m);
  440         return;
  441 
  442  bad:
  443         ICMP6STAT_INC(icp6s_badra);
  444         m_freem(m);
  445 }
  446 
  447 /*
  448  * default router list proccessing sub routines
  449  */
  450 
  451 /* tell the change to user processes watching the routing socket. */
  452 static void
  453 nd6_rtmsg(int cmd, struct rtentry *rt)
  454 {
  455         struct rt_addrinfo info;
  456         struct ifnet *ifp;
  457         struct ifaddr *ifa;
  458 
  459         bzero((caddr_t)&info, sizeof(info));
  460         info.rti_info[RTAX_DST] = rt_key(rt);
  461         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
  462         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
  463         ifp = rt->rt_ifp;
  464         if (ifp != NULL) {
  465                 IF_ADDR_RLOCK(ifp);
  466                 ifa = TAILQ_FIRST(&ifp->if_addrhead);
  467                 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
  468                 ifa_ref(ifa);
  469                 IF_ADDR_RUNLOCK(ifp);
  470                 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
  471         } else
  472                 ifa = NULL;
  473 
  474         rt_missmsg_fib(cmd, &info, rt->rt_flags, 0, rt->rt_fibnum);
  475         if (ifa != NULL)
  476                 ifa_free(ifa);
  477 }
  478 
  479 static void
  480 defrouter_addreq(struct nd_defrouter *new)
  481 {
  482         struct sockaddr_in6 def, mask, gate;
  483         struct rtentry *newrt = NULL;
  484         int error;
  485 
  486         bzero(&def, sizeof(def));
  487         bzero(&mask, sizeof(mask));
  488         bzero(&gate, sizeof(gate));
  489 
  490         def.sin6_len = mask.sin6_len = gate.sin6_len =
  491             sizeof(struct sockaddr_in6);
  492         def.sin6_family = gate.sin6_family = AF_INET6;
  493         gate.sin6_addr = new->rtaddr;
  494 
  495         error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&def,
  496             (struct sockaddr *)&gate, (struct sockaddr *)&mask,
  497             RTF_GATEWAY, &newrt, RT_DEFAULT_FIB);
  498         if (newrt) {
  499                 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
  500                 RTFREE(newrt);
  501         }
  502         if (error == 0)
  503                 new->installed = 1;
  504         return;
  505 }
  506 
  507 struct nd_defrouter *
  508 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
  509 {
  510         struct nd_defrouter *dr;
  511 
  512         TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
  513                 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
  514                         return (dr);
  515         }
  516 
  517         return (NULL);          /* search failed */
  518 }
  519 
  520 /*
  521  * Remove the default route for a given router.
  522  * This is just a subroutine function for defrouter_select(), and should
  523  * not be called from anywhere else.
  524  */
  525 static void
  526 defrouter_delreq(struct nd_defrouter *dr)
  527 {
  528         struct sockaddr_in6 def, mask, gate;
  529         struct rtentry *oldrt = NULL;
  530 
  531         bzero(&def, sizeof(def));
  532         bzero(&mask, sizeof(mask));
  533         bzero(&gate, sizeof(gate));
  534 
  535         def.sin6_len = mask.sin6_len = gate.sin6_len =
  536             sizeof(struct sockaddr_in6);
  537         def.sin6_family = gate.sin6_family = AF_INET6;
  538         gate.sin6_addr = dr->rtaddr;
  539 
  540         in6_rtrequest(RTM_DELETE, (struct sockaddr *)&def,
  541             (struct sockaddr *)&gate,
  542             (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt, RT_DEFAULT_FIB);
  543         if (oldrt) {
  544                 nd6_rtmsg(RTM_DELETE, oldrt);
  545                 RTFREE(oldrt);
  546         }
  547 
  548         dr->installed = 0;
  549 }
  550 
  551 /*
  552  * remove all default routes from default router list
  553  */
  554 void
  555 defrouter_reset(void)
  556 {
  557         struct nd_defrouter *dr;
  558 
  559         TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry)
  560                 defrouter_delreq(dr);
  561 
  562         /*
  563          * XXX should we also nuke any default routers in the kernel, by
  564          * going through them by rtalloc1()?
  565          */
  566 }
  567 
  568 void
  569 defrtrlist_del(struct nd_defrouter *dr)
  570 {
  571         struct nd_defrouter *deldr = NULL;
  572         struct nd_prefix *pr;
  573 
  574         /*
  575          * Flush all the routing table entries that use the router
  576          * as a next hop.
  577          */
  578         if (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV)
  579                 rt6_flush(&dr->rtaddr, dr->ifp);
  580 
  581         if (dr->installed) {
  582                 deldr = dr;
  583                 defrouter_delreq(dr);
  584         }
  585         TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
  586 
  587         /*
  588          * Also delete all the pointers to the router in each prefix lists.
  589          */
  590         LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
  591                 struct nd_pfxrouter *pfxrtr;
  592                 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
  593                         pfxrtr_del(pfxrtr);
  594         }
  595         pfxlist_onlink_check();
  596 
  597         /*
  598          * If the router is the primary one, choose a new one.
  599          * Note that defrouter_select() will remove the current gateway
  600          * from the routing table.
  601          */
  602         if (deldr)
  603                 defrouter_select();
  604 
  605         free(dr, M_IP6NDP);
  606 }
  607 
  608 /*
  609  * Default Router Selection according to Section 6.3.6 of RFC 2461 and
  610  * draft-ietf-ipngwg-router-selection:
  611  * 1) Routers that are reachable or probably reachable should be preferred.
  612  *    If we have more than one (probably) reachable router, prefer ones
  613  *    with the highest router preference.
  614  * 2) When no routers on the list are known to be reachable or
  615  *    probably reachable, routers SHOULD be selected in a round-robin
  616  *    fashion, regardless of router preference values.
  617  * 3) If the Default Router List is empty, assume that all
  618  *    destinations are on-link.
  619  *
  620  * We assume nd_defrouter is sorted by router preference value.
  621  * Since the code below covers both with and without router preference cases,
  622  * we do not need to classify the cases by ifdef.
  623  *
  624  * At this moment, we do not try to install more than one default router,
  625  * even when the multipath routing is available, because we're not sure about
  626  * the benefits for stub hosts comparing to the risk of making the code
  627  * complicated and the possibility of introducing bugs.
  628  */
  629 void
  630 defrouter_select(void)
  631 {
  632         struct nd_defrouter *dr, *selected_dr = NULL, *installed_dr = NULL;
  633         struct llentry *ln = NULL;
  634 
  635         /*
  636          * Let's handle easy case (3) first:
  637          * If default router list is empty, there's nothing to be done.
  638          */
  639         if (TAILQ_EMPTY(&V_nd_defrouter))
  640                 return;
  641 
  642         /*
  643          * Search for a (probably) reachable router from the list.
  644          * We just pick up the first reachable one (if any), assuming that
  645          * the ordering rule of the list described in defrtrlist_update().
  646          */
  647         TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
  648                 IF_AFDATA_RLOCK(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_RUNLOCK(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_RLOCK(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_RUNLOCK(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         return;
  705 }
  706 
  707 /*
  708  * for default router selection
  709  * regards router-preference field as a 2-bit signed integer
  710  */
  711 static int
  712 rtpref(struct nd_defrouter *dr)
  713 {
  714         switch (dr->flags & ND_RA_FLAG_RTPREF_MASK) {
  715         case ND_RA_FLAG_RTPREF_HIGH:
  716                 return (RTPREF_HIGH);
  717         case ND_RA_FLAG_RTPREF_MEDIUM:
  718         case ND_RA_FLAG_RTPREF_RSV:
  719                 return (RTPREF_MEDIUM);
  720         case ND_RA_FLAG_RTPREF_LOW:
  721                 return (RTPREF_LOW);
  722         default:
  723                 /*
  724                  * This case should never happen.  If it did, it would mean a
  725                  * serious bug of kernel internal.  We thus always bark here.
  726                  * Or, can we even panic?
  727                  */
  728                 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->flags);
  729                 return (RTPREF_INVALID);
  730         }
  731         /* NOTREACHED */
  732 }
  733 
  734 static struct nd_defrouter *
  735 defrtrlist_update(struct nd_defrouter *new)
  736 {
  737         struct nd_defrouter *dr, *n;
  738 
  739         if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
  740                 /* entry exists */
  741                 if (new->rtlifetime == 0) {
  742                         defrtrlist_del(dr);
  743                         dr = NULL;
  744                 } else {
  745                         int oldpref = rtpref(dr);
  746 
  747                         /* override */
  748                         dr->flags = new->flags; /* xxx flag check */
  749                         dr->rtlifetime = new->rtlifetime;
  750                         dr->expire = new->expire;
  751 
  752                         /*
  753                          * If the preference does not change, there's no need
  754                          * to sort the entries. Also make sure the selected
  755                          * router is still installed in the kernel.
  756                          */
  757                         if (dr->installed && rtpref(new) == oldpref)
  758                                 return (dr);
  759 
  760                         /*
  761                          * preferred router may be changed, so relocate
  762                          * this router.
  763                          * XXX: calling TAILQ_REMOVE directly is a bad manner.
  764                          * However, since defrtrlist_del() has many side
  765                          * effects, we intentionally do so here.
  766                          * defrouter_select() below will handle routing
  767                          * changes later.
  768                          */
  769                         TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
  770                         n = dr;
  771                         goto insert;
  772                 }
  773                 return (dr);
  774         }
  775 
  776         /* entry does not exist */
  777         if (new->rtlifetime == 0)
  778                 return (NULL);
  779 
  780         n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
  781         if (n == NULL)
  782                 return (NULL);
  783         bzero(n, sizeof(*n));
  784         *n = *new;
  785 
  786 insert:
  787         /*
  788          * Insert the new router in the Default Router List;
  789          * The Default Router List should be in the descending order
  790          * of router-preferece.  Routers with the same preference are
  791          * sorted in the arriving time order.
  792          */
  793 
  794         /* insert at the end of the group */
  795         TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
  796                 if (rtpref(n) > rtpref(dr))
  797                         break;
  798         }
  799         if (dr)
  800                 TAILQ_INSERT_BEFORE(dr, n, dr_entry);
  801         else
  802                 TAILQ_INSERT_TAIL(&V_nd_defrouter, n, dr_entry);
  803 
  804         defrouter_select();
  805 
  806         return (n);
  807 }
  808 
  809 static struct nd_pfxrouter *
  810 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
  811 {
  812         struct nd_pfxrouter *search;
  813 
  814         LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) {
  815                 if (search->router == dr)
  816                         break;
  817         }
  818 
  819         return (search);
  820 }
  821 
  822 static void
  823 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
  824 {
  825         struct nd_pfxrouter *new;
  826 
  827         new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
  828         if (new == NULL)
  829                 return;
  830         bzero(new, sizeof(*new));
  831         new->router = dr;
  832 
  833         LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
  834 
  835         pfxlist_onlink_check();
  836 }
  837 
  838 static void
  839 pfxrtr_del(struct nd_pfxrouter *pfr)
  840 {
  841         LIST_REMOVE(pfr, pfr_entry);
  842         free(pfr, M_IP6NDP);
  843 }
  844 
  845 struct nd_prefix *
  846 nd6_prefix_lookup(struct nd_prefixctl *key)
  847 {
  848         struct nd_prefix *search;
  849 
  850         LIST_FOREACH(search, &V_nd_prefix, ndpr_entry) {
  851                 if (key->ndpr_ifp == search->ndpr_ifp &&
  852                     key->ndpr_plen == search->ndpr_plen &&
  853                     in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr,
  854                     &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) {
  855                         break;
  856                 }
  857         }
  858 
  859         return (search);
  860 }
  861 
  862 int
  863 nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr,
  864     struct nd_prefix **newp)
  865 {
  866         struct nd_prefix *new = NULL;
  867         int error = 0;
  868         int i;
  869         char ip6buf[INET6_ADDRSTRLEN];
  870 
  871         new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
  872         if (new == NULL)
  873                 return(ENOMEM);
  874         bzero(new, sizeof(*new));
  875         new->ndpr_ifp = pr->ndpr_ifp;
  876         new->ndpr_prefix = pr->ndpr_prefix;
  877         new->ndpr_plen = pr->ndpr_plen;
  878         new->ndpr_vltime = pr->ndpr_vltime;
  879         new->ndpr_pltime = pr->ndpr_pltime;
  880         new->ndpr_flags = pr->ndpr_flags;
  881         if ((error = in6_init_prefix_ltimes(new)) != 0) {
  882                 free(new, M_IP6NDP);
  883                 return(error);
  884         }
  885         new->ndpr_lastupdate = time_uptime;
  886         if (newp != NULL)
  887                 *newp = new;
  888 
  889         /* initialization */
  890         LIST_INIT(&new->ndpr_advrtrs);
  891         in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
  892         /* make prefix in the canonical form */
  893         for (i = 0; i < 4; i++)
  894                 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
  895                     new->ndpr_mask.s6_addr32[i];
  896 
  897         /* link ndpr_entry to nd_prefix list */
  898         LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry);
  899 
  900         /* ND_OPT_PI_FLAG_ONLINK processing */
  901         if (new->ndpr_raf_onlink) {
  902                 int e;
  903 
  904                 if ((e = nd6_prefix_onlink(new)) != 0) {
  905                         nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
  906                             "the prefix %s/%d on-link on %s (errno=%d)\n",
  907                             ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
  908                             pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  909                         /* proceed anyway. XXX: is it correct? */
  910                 }
  911         }
  912 
  913         if (dr)
  914                 pfxrtr_add(new, dr);
  915 
  916         return 0;
  917 }
  918 
  919 void
  920 prelist_remove(struct nd_prefix *pr)
  921 {
  922         struct nd_pfxrouter *pfr, *next;
  923         int e;
  924         char ip6buf[INET6_ADDRSTRLEN];
  925 
  926         /* make sure to invalidate the prefix until it is really freed. */
  927         pr->ndpr_vltime = 0;
  928         pr->ndpr_pltime = 0;
  929 
  930         /*
  931          * Though these flags are now meaningless, we'd rather keep the value
  932          * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users
  933          * when executing "ndp -p".
  934          */
  935 
  936         if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
  937             (e = nd6_prefix_offlink(pr)) != 0) {
  938                 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
  939                     "on %s, errno=%d\n",
  940                     ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
  941                     pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  942                 /* what should we do? */
  943         }
  944 
  945         if (pr->ndpr_refcnt > 0)
  946                 return;         /* notice here? */
  947 
  948         /* unlink ndpr_entry from nd_prefix list */
  949         LIST_REMOVE(pr, ndpr_entry);
  950 
  951         /* free list of routers that adversed the prefix */
  952         LIST_FOREACH_SAFE(pfr, &pr->ndpr_advrtrs, pfr_entry, next) {
  953                 free(pfr, M_IP6NDP);
  954         }
  955         free(pr, M_IP6NDP);
  956 
  957         pfxlist_onlink_check();
  958 }
  959 
  960 /*
  961  * dr - may be NULL
  962  */
  963 
  964 static int
  965 prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
  966     struct mbuf *m, int mcast)
  967 {
  968         struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
  969         struct ifaddr *ifa;
  970         struct ifnet *ifp = new->ndpr_ifp;
  971         struct nd_prefix *pr;
  972         int error = 0;
  973         int newprefix = 0;
  974         int auth;
  975         struct in6_addrlifetime lt6_tmp;
  976         char ip6buf[INET6_ADDRSTRLEN];
  977 
  978         auth = 0;
  979         if (m) {
  980                 /*
  981                  * Authenticity for NA consists authentication for
  982                  * both IP header and IP datagrams, doesn't it ?
  983                  */
  984 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
  985                 auth = ((m->m_flags & M_AUTHIPHDR) &&
  986                     (m->m_flags & M_AUTHIPDGM));
  987 #endif
  988         }
  989 
  990         if ((pr = nd6_prefix_lookup(new)) != NULL) {
  991                 /*
  992                  * nd6_prefix_lookup() ensures that pr and new have the same
  993                  * prefix on a same interface.
  994                  */
  995 
  996                 /*
  997                  * Update prefix information.  Note that the on-link (L) bit
  998                  * and the autonomous (A) bit should NOT be changed from 1
  999                  * to 0.
 1000                  */
 1001                 if (new->ndpr_raf_onlink == 1)
 1002                         pr->ndpr_raf_onlink = 1;
 1003                 if (new->ndpr_raf_auto == 1)
 1004                         pr->ndpr_raf_auto = 1;
 1005                 if (new->ndpr_raf_onlink) {
 1006                         pr->ndpr_vltime = new->ndpr_vltime;
 1007                         pr->ndpr_pltime = new->ndpr_pltime;
 1008                         (void)in6_init_prefix_ltimes(pr); /* XXX error case? */
 1009                         pr->ndpr_lastupdate = time_uptime;
 1010                 }
 1011 
 1012                 if (new->ndpr_raf_onlink &&
 1013                     (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
 1014                         int e;
 1015 
 1016                         if ((e = nd6_prefix_onlink(pr)) != 0) {
 1017                                 nd6log((LOG_ERR,
 1018                                     "prelist_update: failed to make "
 1019                                     "the prefix %s/%d on-link on %s "
 1020                                     "(errno=%d)\n",
 1021                                     ip6_sprintf(ip6buf,
 1022                                             &pr->ndpr_prefix.sin6_addr),
 1023                                     pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
 1024                                 /* proceed anyway. XXX: is it correct? */
 1025                         }
 1026                 }
 1027 
 1028                 if (dr && pfxrtr_lookup(pr, dr) == NULL)
 1029                         pfxrtr_add(pr, dr);
 1030         } else {
 1031                 struct nd_prefix *newpr = NULL;
 1032 
 1033                 newprefix = 1;
 1034 
 1035                 if (new->ndpr_vltime == 0)
 1036                         goto end;
 1037                 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
 1038                         goto end;
 1039 
 1040                 error = nd6_prelist_add(new, dr, &newpr);
 1041                 if (error != 0 || newpr == NULL) {
 1042                         nd6log((LOG_NOTICE, "prelist_update: "
 1043                             "nd6_prelist_add failed for %s/%d on %s "
 1044                             "errno=%d, returnpr=%p\n",
 1045                             ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr),
 1046                             new->ndpr_plen, if_name(new->ndpr_ifp),
 1047                             error, newpr));
 1048                         goto end; /* we should just give up in this case. */
 1049                 }
 1050 
 1051                 /*
 1052                  * XXX: from the ND point of view, we can ignore a prefix
 1053                  * with the on-link bit being zero.  However, we need a
 1054                  * prefix structure for references from autoconfigured
 1055                  * addresses.  Thus, we explicitly make sure that the prefix
 1056                  * itself expires now.
 1057                  */
 1058                 if (newpr->ndpr_raf_onlink == 0) {
 1059                         newpr->ndpr_vltime = 0;
 1060                         newpr->ndpr_pltime = 0;
 1061                         in6_init_prefix_ltimes(newpr);
 1062                 }
 1063 
 1064                 pr = newpr;
 1065         }
 1066 
 1067         /*
 1068          * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
 1069          * Note that pr must be non NULL at this point.
 1070          */
 1071 
 1072         /* 5.5.3 (a). Ignore the prefix without the A bit set. */
 1073         if (!new->ndpr_raf_auto)
 1074                 goto end;
 1075 
 1076         /*
 1077          * 5.5.3 (b). the link-local prefix should have been ignored in
 1078          * nd6_ra_input.
 1079          */
 1080 
 1081         /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */
 1082         if (new->ndpr_pltime > new->ndpr_vltime) {
 1083                 error = EINVAL; /* XXX: won't be used */
 1084                 goto end;
 1085         }
 1086 
 1087         /*
 1088          * 5.5.3 (d).  If the prefix advertised is not equal to the prefix of
 1089          * an address configured by stateless autoconfiguration already in the
 1090          * list of addresses associated with the interface, and the Valid
 1091          * Lifetime is not 0, form an address.  We first check if we have
 1092          * a matching prefix.
 1093          * Note: we apply a clarification in rfc2462bis-02 here.  We only
 1094          * consider autoconfigured addresses while RFC2462 simply said
 1095          * "address".
 1096          */
 1097         IF_ADDR_RLOCK(ifp);
 1098         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1099                 struct in6_ifaddr *ifa6;
 1100                 u_int32_t remaininglifetime;
 1101 
 1102                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1103                         continue;
 1104 
 1105                 ifa6 = (struct in6_ifaddr *)ifa;
 1106 
 1107                 /*
 1108                  * We only consider autoconfigured addresses as per rfc2462bis.
 1109                  */
 1110                 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
 1111                         continue;
 1112 
 1113                 /*
 1114                  * Spec is not clear here, but I believe we should concentrate
 1115                  * on unicast (i.e. not anycast) addresses.
 1116                  * XXX: other ia6_flags? detached or duplicated?
 1117                  */
 1118                 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
 1119                         continue;
 1120 
 1121                 /*
 1122                  * Ignore the address if it is not associated with a prefix
 1123                  * or is associated with a prefix that is different from this
 1124                  * one.  (pr is never NULL here)
 1125                  */
 1126                 if (ifa6->ia6_ndpr != pr)
 1127                         continue;
 1128 
 1129                 if (ia6_match == NULL) /* remember the first one */
 1130                         ia6_match = ifa6;
 1131 
 1132                 /*
 1133                  * An already autoconfigured address matched.  Now that we
 1134                  * are sure there is at least one matched address, we can
 1135                  * proceed to 5.5.3. (e): update the lifetimes according to the
 1136                  * "two hours" rule and the privacy extension.
 1137                  * We apply some clarifications in rfc2462bis:
 1138                  * - use remaininglifetime instead of storedlifetime as a
 1139                  *   variable name
 1140                  * - remove the dead code in the "two-hour" rule
 1141                  */
 1142 #define TWOHOUR         (120*60)
 1143                 lt6_tmp = ifa6->ia6_lifetime;
 1144 
 1145                 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
 1146                         remaininglifetime = ND6_INFINITE_LIFETIME;
 1147                 else if (time_uptime - ifa6->ia6_updatetime >
 1148                          lt6_tmp.ia6t_vltime) {
 1149                         /*
 1150                          * The case of "invalid" address.  We should usually
 1151                          * not see this case.
 1152                          */
 1153                         remaininglifetime = 0;
 1154                 } else
 1155                         remaininglifetime = lt6_tmp.ia6t_vltime -
 1156                             (time_uptime - ifa6->ia6_updatetime);
 1157 
 1158                 /* when not updating, keep the current stored lifetime. */
 1159                 lt6_tmp.ia6t_vltime = remaininglifetime;
 1160 
 1161                 if (TWOHOUR < new->ndpr_vltime ||
 1162                     remaininglifetime < new->ndpr_vltime) {
 1163                         lt6_tmp.ia6t_vltime = new->ndpr_vltime;
 1164                 } else if (remaininglifetime <= TWOHOUR) {
 1165                         if (auth) {
 1166                                 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
 1167                         }
 1168                 } else {
 1169                         /*
 1170                          * new->ndpr_vltime <= TWOHOUR &&
 1171                          * TWOHOUR < remaininglifetime
 1172                          */
 1173                         lt6_tmp.ia6t_vltime = TWOHOUR;
 1174                 }
 1175 
 1176                 /* The 2 hour rule is not imposed for preferred lifetime. */
 1177                 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
 1178 
 1179                 in6_init_address_ltimes(pr, &lt6_tmp);
 1180 
 1181                 /*
 1182                  * We need to treat lifetimes for temporary addresses
 1183                  * differently, according to
 1184                  * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
 1185                  * we only update the lifetimes when they are in the maximum
 1186                  * intervals.
 1187                  */
 1188                 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
 1189                         u_int32_t maxvltime, maxpltime;
 1190 
 1191                         if (V_ip6_temp_valid_lifetime >
 1192                             (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
 1193                             V_ip6_desync_factor)) {
 1194                                 maxvltime = V_ip6_temp_valid_lifetime -
 1195                                     (time_uptime - ifa6->ia6_createtime) -
 1196                                     V_ip6_desync_factor;
 1197                         } else
 1198                                 maxvltime = 0;
 1199                         if (V_ip6_temp_preferred_lifetime >
 1200                             (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
 1201                             V_ip6_desync_factor)) {
 1202                                 maxpltime = V_ip6_temp_preferred_lifetime -
 1203                                     (time_uptime - ifa6->ia6_createtime) -
 1204                                     V_ip6_desync_factor;
 1205                         } else
 1206                                 maxpltime = 0;
 1207 
 1208                         if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
 1209                             lt6_tmp.ia6t_vltime > maxvltime) {
 1210                                 lt6_tmp.ia6t_vltime = maxvltime;
 1211                         }
 1212                         if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
 1213                             lt6_tmp.ia6t_pltime > maxpltime) {
 1214                                 lt6_tmp.ia6t_pltime = maxpltime;
 1215                         }
 1216                 }
 1217                 ifa6->ia6_lifetime = lt6_tmp;
 1218                 ifa6->ia6_updatetime = time_uptime;
 1219         }
 1220         IF_ADDR_RUNLOCK(ifp);
 1221         if (ia6_match == NULL && new->ndpr_vltime) {
 1222                 int ifidlen;
 1223 
 1224                 /*
 1225                  * 5.5.3 (d) (continued)
 1226                  * No address matched and the valid lifetime is non-zero.
 1227                  * Create a new address.
 1228                  */
 1229 
 1230                 /*
 1231                  * Prefix Length check:
 1232                  * If the sum of the prefix length and interface identifier
 1233                  * length does not equal 128 bits, the Prefix Information
 1234                  * option MUST be ignored.  The length of the interface
 1235                  * identifier is defined in a separate link-type specific
 1236                  * document.
 1237                  */
 1238                 ifidlen = in6_if2idlen(ifp);
 1239                 if (ifidlen < 0) {
 1240                         /* this should not happen, so we always log it. */
 1241                         log(LOG_ERR, "prelist_update: IFID undefined (%s)\n",
 1242                             if_name(ifp));
 1243                         goto end;
 1244                 }
 1245                 if (ifidlen + pr->ndpr_plen != 128) {
 1246                         nd6log((LOG_INFO,
 1247                             "prelist_update: invalid prefixlen "
 1248                             "%d for %s, ignored\n",
 1249                             pr->ndpr_plen, if_name(ifp)));
 1250                         goto end;
 1251                 }
 1252 
 1253                 if ((ia6 = in6_ifadd(new, mcast)) != NULL) {
 1254                         /*
 1255                          * note that we should use pr (not new) for reference.
 1256                          */
 1257                         pr->ndpr_refcnt++;
 1258                         ia6->ia6_ndpr = pr;
 1259 
 1260                         /*
 1261                          * RFC 3041 3.3 (2).
 1262                          * When a new public address is created as described
 1263                          * in RFC2462, also create a new temporary address.
 1264                          *
 1265                          * RFC 3041 3.5.
 1266                          * When an interface connects to a new link, a new
 1267                          * randomized interface identifier should be generated
 1268                          * immediately together with a new set of temporary
 1269                          * addresses.  Thus, we specifiy 1 as the 2nd arg of
 1270                          * in6_tmpifadd().
 1271                          */
 1272                         if (V_ip6_use_tempaddr) {
 1273                                 int e;
 1274                                 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
 1275                                         nd6log((LOG_NOTICE, "prelist_update: "
 1276                                             "failed to create a temporary "
 1277                                             "address, errno=%d\n",
 1278                                             e));
 1279                                 }
 1280                         }
 1281                         ifa_free(&ia6->ia_ifa);
 1282 
 1283                         /*
 1284                          * A newly added address might affect the status
 1285                          * of other addresses, so we check and update it.
 1286                          * XXX: what if address duplication happens?
 1287                          */
 1288                         pfxlist_onlink_check();
 1289                 } else {
 1290                         /* just set an error. do not bark here. */
 1291                         error = EADDRNOTAVAIL; /* XXX: might be unused. */
 1292                 }
 1293         }
 1294 
 1295  end:
 1296         return error;
 1297 }
 1298 
 1299 /*
 1300  * A supplement function used in the on-link detection below;
 1301  * detect if a given prefix has a (probably) reachable advertising router.
 1302  * XXX: lengthy function name...
 1303  */
 1304 static struct nd_pfxrouter *
 1305 find_pfxlist_reachable_router(struct nd_prefix *pr)
 1306 {
 1307         struct nd_pfxrouter *pfxrtr;
 1308         struct llentry *ln;
 1309         int canreach;
 1310 
 1311         LIST_FOREACH(pfxrtr, &pr->ndpr_advrtrs, pfr_entry) {
 1312                 IF_AFDATA_RLOCK(pfxrtr->router->ifp);
 1313                 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
 1314                 IF_AFDATA_RUNLOCK(pfxrtr->router->ifp);
 1315                 if (ln == NULL)
 1316                         continue;
 1317                 canreach = ND6_IS_LLINFO_PROBREACH(ln);
 1318                 LLE_RUNLOCK(ln);
 1319                 if (canreach)
 1320                         break;
 1321         }
 1322         return (pfxrtr);
 1323 }
 1324 
 1325 /*
 1326  * Check if each prefix in the prefix list has at least one available router
 1327  * that advertised the prefix (a router is "available" if its neighbor cache
 1328  * entry is reachable or probably reachable).
 1329  * If the check fails, the prefix may be off-link, because, for example,
 1330  * we have moved from the network but the lifetime of the prefix has not
 1331  * expired yet.  So we should not use the prefix if there is another prefix
 1332  * that has an available router.
 1333  * But, if there is no prefix that has an available router, we still regards
 1334  * all the prefixes as on-link.  This is because we can't tell if all the
 1335  * routers are simply dead or if we really moved from the network and there
 1336  * is no router around us.
 1337  */
 1338 void
 1339 pfxlist_onlink_check()
 1340 {
 1341         struct nd_prefix *pr;
 1342         struct in6_ifaddr *ifa;
 1343         struct nd_defrouter *dr;
 1344         struct nd_pfxrouter *pfxrtr = NULL;
 1345 
 1346         /*
 1347          * Check if there is a prefix that has a reachable advertising
 1348          * router.
 1349          */
 1350         LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
 1351                 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
 1352                         break;
 1353         }
 1354 
 1355         /*
 1356          * If we have no such prefix, check whether we still have a router
 1357          * that does not advertise any prefixes.
 1358          */
 1359         if (pr == NULL) {
 1360                 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
 1361                         struct nd_prefix *pr0;
 1362 
 1363                         LIST_FOREACH(pr0, &V_nd_prefix, ndpr_entry) {
 1364                                 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
 1365                                         break;
 1366                         }
 1367                         if (pfxrtr != NULL)
 1368                                 break;
 1369                 }
 1370         }
 1371         if (pr != NULL || (!TAILQ_EMPTY(&V_nd_defrouter) && pfxrtr == NULL)) {
 1372                 /*
 1373                  * There is at least one prefix that has a reachable router,
 1374                  * or at least a router which probably does not advertise
 1375                  * any prefixes.  The latter would be the case when we move
 1376                  * to a new link where we have a router that does not provide
 1377                  * prefixes and we configure an address by hand.
 1378                  * Detach prefixes which have no reachable advertising
 1379                  * router, and attach other prefixes.
 1380                  */
 1381                 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
 1382                         /* XXX: a link-local prefix should never be detached */
 1383                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1384                                 continue;
 1385 
 1386                         /*
 1387                          * we aren't interested in prefixes without the L bit
 1388                          * set.
 1389                          */
 1390                         if (pr->ndpr_raf_onlink == 0)
 1391                                 continue;
 1392 
 1393                         if (pr->ndpr_raf_auto == 0)
 1394                                 continue;
 1395 
 1396                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
 1397                             find_pfxlist_reachable_router(pr) == NULL)
 1398                                 pr->ndpr_stateflags |= NDPRF_DETACHED;
 1399                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
 1400                             find_pfxlist_reachable_router(pr) != 0)
 1401                                 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
 1402                 }
 1403         } else {
 1404                 /* there is no prefix that has a reachable router */
 1405                 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
 1406                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1407                                 continue;
 1408 
 1409                         if (pr->ndpr_raf_onlink == 0)
 1410                                 continue;
 1411 
 1412                         if (pr->ndpr_raf_auto == 0)
 1413                                 continue;
 1414 
 1415                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
 1416                                 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
 1417                 }
 1418         }
 1419 
 1420         /*
 1421          * Remove each interface route associated with a (just) detached
 1422          * prefix, and reinstall the interface route for a (just) attached
 1423          * prefix.  Note that all attempt of reinstallation does not
 1424          * necessarily success, when a same prefix is shared among multiple
 1425          * interfaces.  Such cases will be handled in nd6_prefix_onlink,
 1426          * so we don't have to care about them.
 1427          */
 1428         LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
 1429                 int e;
 1430                 char ip6buf[INET6_ADDRSTRLEN];
 1431 
 1432                 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1433                         continue;
 1434 
 1435                 if (pr->ndpr_raf_onlink == 0)
 1436                         continue;
 1437 
 1438                 if (pr->ndpr_raf_auto == 0)
 1439                         continue;
 1440 
 1441                 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
 1442                     (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
 1443                         if ((e = nd6_prefix_offlink(pr)) != 0) {
 1444                                 nd6log((LOG_ERR,
 1445                                     "pfxlist_onlink_check: failed to "
 1446                                     "make %s/%d offlink, errno=%d\n",
 1447                                     ip6_sprintf(ip6buf,
 1448                                             &pr->ndpr_prefix.sin6_addr),
 1449                                             pr->ndpr_plen, e));
 1450                         }
 1451                 }
 1452                 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
 1453                     (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
 1454                     pr->ndpr_raf_onlink) {
 1455                         if ((e = nd6_prefix_onlink(pr)) != 0) {
 1456                                 nd6log((LOG_ERR,
 1457                                     "pfxlist_onlink_check: failed to "
 1458                                     "make %s/%d onlink, errno=%d\n",
 1459                                     ip6_sprintf(ip6buf,
 1460                                             &pr->ndpr_prefix.sin6_addr),
 1461                                             pr->ndpr_plen, e));
 1462                         }
 1463                 }
 1464         }
 1465 
 1466         /*
 1467          * Changes on the prefix status might affect address status as well.
 1468          * Make sure that all addresses derived from an attached prefix are
 1469          * attached, and that all addresses derived from a detached prefix are
 1470          * detached.  Note, however, that a manually configured address should
 1471          * always be attached.
 1472          * The precise detection logic is same as the one for prefixes.
 1473          *
 1474          * XXXRW: in6_ifaddrhead locking.
 1475          */
 1476         TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
 1477                 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
 1478                         continue;
 1479 
 1480                 if (ifa->ia6_ndpr == NULL) {
 1481                         /*
 1482                          * This can happen when we first configure the address
 1483                          * (i.e. the address exists, but the prefix does not).
 1484                          * XXX: complicated relationships...
 1485                          */
 1486                         continue;
 1487                 }
 1488 
 1489                 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
 1490                         break;
 1491         }
 1492         if (ifa) {
 1493                 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
 1494                         if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1495                                 continue;
 1496 
 1497                         if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
 1498                                 continue;
 1499 
 1500                         if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) {
 1501                                 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
 1502                                         ifa->ia6_flags &= ~IN6_IFF_DETACHED;
 1503                                         ifa->ia6_flags |= IN6_IFF_TENTATIVE;
 1504                                         nd6_dad_start((struct ifaddr *)ifa, 0);
 1505                                 }
 1506                         } else {
 1507                                 ifa->ia6_flags |= IN6_IFF_DETACHED;
 1508                         }
 1509                 }
 1510         }
 1511         else {
 1512                 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
 1513                         if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1514                                 continue;
 1515 
 1516                         if (ifa->ia6_flags & IN6_IFF_DETACHED) {
 1517                                 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
 1518                                 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
 1519                                 /* Do we need a delay in this case? */
 1520                                 nd6_dad_start((struct ifaddr *)ifa, 0);
 1521                         }
 1522                 }
 1523         }
 1524 }
 1525 
 1526 static int
 1527 nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa)
 1528 {
 1529         static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
 1530         struct radix_node_head *rnh;
 1531         struct rtentry *rt;
 1532         struct sockaddr_in6 mask6;
 1533         u_long rtflags;
 1534         int error, a_failure, fibnum;
 1535 
 1536         /*
 1537          * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
 1538          * ifa->ifa_rtrequest = nd6_rtrequest;
 1539          */
 1540         bzero(&mask6, sizeof(mask6));
 1541         mask6.sin6_len = sizeof(mask6);
 1542         mask6.sin6_addr = pr->ndpr_mask;
 1543         rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP;
 1544 
 1545         a_failure = 0;
 1546         for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
 1547 
 1548                 rt = NULL;
 1549                 error = in6_rtrequest(RTM_ADD,
 1550                     (struct sockaddr *)&pr->ndpr_prefix, ifa->ifa_addr,
 1551                     (struct sockaddr *)&mask6, rtflags, &rt, fibnum);
 1552                 if (error == 0) {
 1553                         KASSERT(rt != NULL, ("%s: in6_rtrequest return no "
 1554                             "error(%d) but rt is NULL, pr=%p, ifa=%p", __func__,
 1555                             error, pr, ifa));
 1556 
 1557                         rnh = rt_tables_get_rnh(rt->rt_fibnum, AF_INET6);
 1558                         /* XXX what if rhn == NULL? */
 1559                         RADIX_NODE_HEAD_LOCK(rnh);
 1560                         RT_LOCK(rt);
 1561                         if (rt_setgate(rt, rt_key(rt),
 1562                             (struct sockaddr *)&null_sdl) == 0) {
 1563                                 struct sockaddr_dl *dl;
 1564 
 1565                                 dl = (struct sockaddr_dl *)rt->rt_gateway;
 1566                                 dl->sdl_type = rt->rt_ifp->if_type;
 1567                                 dl->sdl_index = rt->rt_ifp->if_index;
 1568                         }
 1569                         RADIX_NODE_HEAD_UNLOCK(rnh);
 1570                         nd6_rtmsg(RTM_ADD, rt);
 1571                         RT_UNLOCK(rt);
 1572                         pr->ndpr_stateflags |= NDPRF_ONLINK;
 1573                 } else {
 1574                         char ip6buf[INET6_ADDRSTRLEN];
 1575                         char ip6bufg[INET6_ADDRSTRLEN];
 1576                         char ip6bufm[INET6_ADDRSTRLEN];
 1577                         struct sockaddr_in6 *sin6;
 1578 
 1579                         sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
 1580                         nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add "
 1581                             "route for a prefix (%s/%d) on %s, gw=%s, mask=%s, "
 1582                             "flags=%lx errno = %d\n",
 1583                             ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
 1584                             pr->ndpr_plen, if_name(pr->ndpr_ifp),
 1585                             ip6_sprintf(ip6bufg, &sin6->sin6_addr),
 1586                             ip6_sprintf(ip6bufm, &mask6.sin6_addr),
 1587                             rtflags, error));
 1588 
 1589                         /* Save last error to return, see rtinit(). */
 1590                         a_failure = error;
 1591                 }
 1592 
 1593                 if (rt != NULL) {
 1594                         RT_LOCK(rt);
 1595                         RT_REMREF(rt);
 1596                         RT_UNLOCK(rt);
 1597                 }
 1598         }
 1599 
 1600         /* Return the last error we got. */
 1601         return (a_failure);
 1602 }
 1603 
 1604 static int
 1605 nd6_prefix_onlink(struct nd_prefix *pr)
 1606 {
 1607         struct ifaddr *ifa;
 1608         struct ifnet *ifp = pr->ndpr_ifp;
 1609         struct nd_prefix *opr;
 1610         int error = 0;
 1611         char ip6buf[INET6_ADDRSTRLEN];
 1612 
 1613         /* sanity check */
 1614         if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
 1615                 nd6log((LOG_ERR,
 1616                     "nd6_prefix_onlink: %s/%d is already on-link\n",
 1617                     ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
 1618                     pr->ndpr_plen));
 1619                 return (EEXIST);
 1620         }
 1621 
 1622         /*
 1623          * Add the interface route associated with the prefix.  Before
 1624          * installing the route, check if there's the same prefix on another
 1625          * interface, and the prefix has already installed the interface route.
 1626          * Although such a configuration is expected to be rare, we explicitly
 1627          * allow it.
 1628          */
 1629         LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
 1630                 if (opr == pr)
 1631                         continue;
 1632 
 1633                 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
 1634                         continue;
 1635 
 1636                 if (opr->ndpr_plen == pr->ndpr_plen &&
 1637                     in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
 1638                     &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen))
 1639                         return (0);
 1640         }
 1641 
 1642         /*
 1643          * We prefer link-local addresses as the associated interface address.
 1644          */
 1645         /* search for a link-local addr */
 1646         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
 1647             IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
 1648         if (ifa == NULL) {
 1649                 /* XXX: freebsd does not have ifa_ifwithaf */
 1650                 IF_ADDR_RLOCK(ifp);
 1651                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1652                         if (ifa->ifa_addr->sa_family == AF_INET6)
 1653                                 break;
 1654                 }
 1655                 if (ifa != NULL)
 1656                         ifa_ref(ifa);
 1657                 IF_ADDR_RUNLOCK(ifp);
 1658                 /* should we care about ia6_flags? */
 1659         }
 1660         if (ifa == NULL) {
 1661                 /*
 1662                  * This can still happen, when, for example, we receive an RA
 1663                  * containing a prefix with the L bit set and the A bit clear,
 1664                  * after removing all IPv6 addresses on the receiving
 1665                  * interface.  This should, of course, be rare though.
 1666                  */
 1667                 nd6log((LOG_NOTICE,
 1668                     "nd6_prefix_onlink: failed to find any ifaddr"
 1669                     " to add route for a prefix(%s/%d) on %s\n",
 1670                     ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
 1671                     pr->ndpr_plen, if_name(ifp)));
 1672                 return (0);
 1673         }
 1674 
 1675         error = nd6_prefix_onlink_rtrequest(pr, ifa);
 1676 
 1677         if (ifa != NULL)
 1678                 ifa_free(ifa);
 1679 
 1680         return (error);
 1681 }
 1682 
 1683 static int
 1684 nd6_prefix_offlink(struct nd_prefix *pr)
 1685 {
 1686         int error = 0;
 1687         struct ifnet *ifp = pr->ndpr_ifp;
 1688         struct nd_prefix *opr;
 1689         struct sockaddr_in6 sa6, mask6;
 1690         struct rtentry *rt;
 1691         char ip6buf[INET6_ADDRSTRLEN];
 1692         int fibnum, a_failure;
 1693 
 1694         /* sanity check */
 1695         if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
 1696                 nd6log((LOG_ERR,
 1697                     "nd6_prefix_offlink: %s/%d is already off-link\n",
 1698                     ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
 1699                     pr->ndpr_plen));
 1700                 return (EEXIST);
 1701         }
 1702 
 1703         bzero(&sa6, sizeof(sa6));
 1704         sa6.sin6_family = AF_INET6;
 1705         sa6.sin6_len = sizeof(sa6);
 1706         bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
 1707             sizeof(struct in6_addr));
 1708         bzero(&mask6, sizeof(mask6));
 1709         mask6.sin6_family = AF_INET6;
 1710         mask6.sin6_len = sizeof(sa6);
 1711         bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
 1712 
 1713         a_failure = 0;
 1714         for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
 1715                 rt = NULL;
 1716                 error = in6_rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
 1717                     (struct sockaddr *)&mask6, 0, &rt, fibnum);
 1718                 if (error == 0) {
 1719                         /* report the route deletion to the routing socket. */
 1720                         if (rt != NULL)
 1721                                 nd6_rtmsg(RTM_DELETE, rt);
 1722                 } else {
 1723                         /* Save last error to return, see rtinit(). */
 1724                         a_failure = error;
 1725                 }
 1726                 if (rt != NULL) {
 1727                         RTFREE(rt);
 1728                 }
 1729         }
 1730         error = a_failure;
 1731         a_failure = 1;
 1732         if (error == 0) {
 1733                 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
 1734 
 1735                 /*
 1736                  * There might be the same prefix on another interface,
 1737                  * the prefix which could not be on-link just because we have
 1738                  * the interface route (see comments in nd6_prefix_onlink).
 1739                  * If there's one, try to make the prefix on-link on the
 1740                  * interface.
 1741                  */
 1742                 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
 1743                         if (opr == pr)
 1744                                 continue;
 1745 
 1746                         if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
 1747                                 continue;
 1748 
 1749                         /*
 1750                          * KAME specific: detached prefixes should not be
 1751                          * on-link.
 1752                          */
 1753                         if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
 1754                                 continue;
 1755 
 1756                         if (opr->ndpr_plen == pr->ndpr_plen &&
 1757                             in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
 1758                             &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
 1759                                 int e;
 1760 
 1761                                 if ((e = nd6_prefix_onlink(opr)) != 0) {
 1762                                         nd6log((LOG_ERR,
 1763                                             "nd6_prefix_offlink: failed to "
 1764                                             "recover a prefix %s/%d from %s "
 1765                                             "to %s (errno = %d)\n",
 1766                                             ip6_sprintf(ip6buf,
 1767                                                 &opr->ndpr_prefix.sin6_addr),
 1768                                             opr->ndpr_plen, if_name(ifp),
 1769                                             if_name(opr->ndpr_ifp), e));
 1770                                 } else
 1771                                         a_failure = 0;
 1772                         }
 1773                 }
 1774         } else {
 1775                 /* XXX: can we still set the NDPRF_ONLINK flag? */
 1776                 nd6log((LOG_ERR,
 1777                     "nd6_prefix_offlink: failed to delete route: "
 1778                     "%s/%d on %s (errno = %d)\n",
 1779                     ip6_sprintf(ip6buf, &sa6.sin6_addr), pr->ndpr_plen,
 1780                     if_name(ifp), error));
 1781         }
 1782 
 1783         if (a_failure)
 1784                 lltable_prefix_free(AF_INET6, (struct sockaddr *)&sa6,
 1785                     (struct sockaddr *)&mask6, LLE_STATIC);
 1786 
 1787         return (error);
 1788 }
 1789 
 1790 static struct in6_ifaddr *
 1791 in6_ifadd(struct nd_prefixctl *pr, int mcast)
 1792 {
 1793         struct ifnet *ifp = pr->ndpr_ifp;
 1794         struct ifaddr *ifa;
 1795         struct in6_aliasreq ifra;
 1796         struct in6_ifaddr *ia, *ib;
 1797         int error, plen0;
 1798         struct in6_addr mask;
 1799         int prefixlen = pr->ndpr_plen;
 1800         int updateflags;
 1801         char ip6buf[INET6_ADDRSTRLEN];
 1802 
 1803         in6_prefixlen2mask(&mask, prefixlen);
 1804 
 1805         /*
 1806          * find a link-local address (will be interface ID).
 1807          * Is it really mandatory? Theoretically, a global or a site-local
 1808          * address can be configured without a link-local address, if we
 1809          * have a unique interface identifier...
 1810          *
 1811          * it is not mandatory to have a link-local address, we can generate
 1812          * interface identifier on the fly.  we do this because:
 1813          * (1) it should be the easiest way to find interface identifier.
 1814          * (2) RFC2462 5.4 suggesting the use of the same interface identifier
 1815          * for multiple addresses on a single interface, and possible shortcut
 1816          * of DAD.  we omitted DAD for this reason in the past.
 1817          * (3) a user can prevent autoconfiguration of global address
 1818          * by removing link-local address by hand (this is partly because we
 1819          * don't have other way to control the use of IPv6 on an interface.
 1820          * this has been our design choice - cf. NRL's "ifconfig auto").
 1821          * (4) it is easier to manage when an interface has addresses
 1822          * with the same interface identifier, than to have multiple addresses
 1823          * with different interface identifiers.
 1824          */
 1825         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
 1826         if (ifa)
 1827                 ib = (struct in6_ifaddr *)ifa;
 1828         else
 1829                 return NULL;
 1830 
 1831         /* prefixlen + ifidlen must be equal to 128 */
 1832         plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
 1833         if (prefixlen != plen0) {
 1834                 ifa_free(ifa);
 1835                 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
 1836                     "(prefix=%d ifid=%d)\n",
 1837                     if_name(ifp), prefixlen, 128 - plen0));
 1838                 return NULL;
 1839         }
 1840 
 1841         /* make ifaddr */
 1842 
 1843         bzero(&ifra, sizeof(ifra));
 1844         /*
 1845          * in6_update_ifa() does not use ifra_name, but we accurately set it
 1846          * for safety.
 1847          */
 1848         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
 1849         ifra.ifra_addr.sin6_family = AF_INET6;
 1850         ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
 1851         /* prefix */
 1852         ifra.ifra_addr.sin6_addr = pr->ndpr_prefix.sin6_addr;
 1853         ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
 1854         ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
 1855         ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
 1856         ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
 1857 
 1858         /* interface ID */
 1859         ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
 1860             (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
 1861         ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
 1862             (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
 1863         ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
 1864             (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
 1865         ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
 1866             (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
 1867         ifa_free(ifa);
 1868 
 1869         /* new prefix mask. */
 1870         ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
 1871         ifra.ifra_prefixmask.sin6_family = AF_INET6;
 1872         bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
 1873             sizeof(ifra.ifra_prefixmask.sin6_addr));
 1874 
 1875         /* lifetimes. */
 1876         ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
 1877         ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
 1878 
 1879         /* XXX: scope zone ID? */
 1880 
 1881         ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
 1882 
 1883         /*
 1884          * Make sure that we do not have this address already.  This should
 1885          * usually not happen, but we can still see this case, e.g., if we
 1886          * have manually configured the exact address to be configured.
 1887          */
 1888         ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
 1889             &ifra.ifra_addr.sin6_addr);
 1890         if (ifa != NULL) {
 1891                 ifa_free(ifa);
 1892                 /* this should be rare enough to make an explicit log */
 1893                 log(LOG_INFO, "in6_ifadd: %s is already configured\n",
 1894                     ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr));
 1895                 return (NULL);
 1896         }
 1897 
 1898         /*
 1899          * Allocate ifaddr structure, link into chain, etc.
 1900          * If we are going to create a new address upon receiving a multicasted
 1901          * RA, we need to impose a random delay before starting DAD.
 1902          * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2]
 1903          */
 1904         updateflags = 0;
 1905         if (mcast)
 1906                 updateflags |= IN6_IFAUPDATE_DADDELAY;
 1907         if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) {
 1908                 nd6log((LOG_ERR,
 1909                     "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
 1910                     ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr),
 1911                     if_name(ifp), error));
 1912                 return (NULL);  /* ifaddr must not have been allocated. */
 1913         }
 1914 
 1915         ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
 1916         /*
 1917          * XXXRW: Assumption of non-NULLness here might not be true with
 1918          * fine-grained locking -- should we validate it?  Or just return
 1919          * earlier ifa rather than looking it up again?
 1920          */
 1921         return (ia);            /* this is always non-NULL  and referenced. */
 1922 }
 1923 
 1924 /*
 1925  * ia0 - corresponding public address
 1926  */
 1927 int
 1928 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay)
 1929 {
 1930         struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
 1931         struct in6_ifaddr *newia, *ia;
 1932         struct in6_aliasreq ifra;
 1933         int i, error;
 1934         int trylimit = 3;       /* XXX: adhoc value */
 1935         int updateflags;
 1936         u_int32_t randid[2];
 1937         time_t vltime0, pltime0;
 1938 
 1939         bzero(&ifra, sizeof(ifra));
 1940         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
 1941         ifra.ifra_addr = ia0->ia_addr;
 1942         /* copy prefix mask */
 1943         ifra.ifra_prefixmask = ia0->ia_prefixmask;
 1944         /* clear the old IFID */
 1945         for (i = 0; i < 4; i++) {
 1946                 ifra.ifra_addr.sin6_addr.s6_addr32[i] &=
 1947                     ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
 1948         }
 1949 
 1950   again:
 1951         if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
 1952             (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) {
 1953                 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good "
 1954                     "random IFID\n"));
 1955                 return (EINVAL);
 1956         }
 1957         ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
 1958             (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
 1959         ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
 1960             (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
 1961 
 1962         /*
 1963          * in6_get_tmpifid() quite likely provided a unique interface ID.
 1964          * However, we may still have a chance to see collision, because
 1965          * there may be a time lag between generation of the ID and generation
 1966          * of the address.  So, we'll do one more sanity check.
 1967          */
 1968         IN6_IFADDR_RLOCK();
 1969         TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
 1970                 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
 1971                     &ifra.ifra_addr.sin6_addr)) {
 1972                         if (trylimit-- == 0) {
 1973                                 IN6_IFADDR_RUNLOCK();
 1974                                 /*
 1975                                  * Give up.  Something strange should have
 1976                                  * happened.
 1977                                  */
 1978                                 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to "
 1979                                     "find a unique random IFID\n"));
 1980                                 return (EEXIST);
 1981                         }
 1982                         IN6_IFADDR_RUNLOCK();
 1983                         forcegen = 1;
 1984                         goto again;
 1985                 }
 1986         }
 1987         IN6_IFADDR_RUNLOCK();
 1988 
 1989         /*
 1990          * The Valid Lifetime is the lower of the Valid Lifetime of the
 1991          * public address or TEMP_VALID_LIFETIME.
 1992          * The Preferred Lifetime is the lower of the Preferred Lifetime
 1993          * of the public address or TEMP_PREFERRED_LIFETIME -
 1994          * DESYNC_FACTOR.
 1995          */
 1996         if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
 1997                 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
 1998                     (ia0->ia6_lifetime.ia6t_vltime -
 1999                     (time_uptime - ia0->ia6_updatetime));
 2000                 if (vltime0 > V_ip6_temp_valid_lifetime)
 2001                         vltime0 = V_ip6_temp_valid_lifetime;
 2002         } else
 2003                 vltime0 = V_ip6_temp_valid_lifetime;
 2004         if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
 2005                 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
 2006                     (ia0->ia6_lifetime.ia6t_pltime -
 2007                     (time_uptime - ia0->ia6_updatetime));
 2008                 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){
 2009                         pltime0 = V_ip6_temp_preferred_lifetime -
 2010                             V_ip6_desync_factor;
 2011                 }
 2012         } else
 2013                 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor;
 2014         ifra.ifra_lifetime.ia6t_vltime = vltime0;
 2015         ifra.ifra_lifetime.ia6t_pltime = pltime0;
 2016 
 2017         /*
 2018          * A temporary address is created only if this calculated Preferred
 2019          * Lifetime is greater than REGEN_ADVANCE time units.
 2020          */
 2021         if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance)
 2022                 return (0);
 2023 
 2024         /* XXX: scope zone ID? */
 2025 
 2026         ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
 2027 
 2028         /* allocate ifaddr structure, link into chain, etc. */
 2029         updateflags = 0;
 2030         if (delay)
 2031                 updateflags |= IN6_IFAUPDATE_DADDELAY;
 2032         if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0)
 2033                 return (error);
 2034 
 2035         newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
 2036         if (newia == NULL) {    /* XXX: can it happen? */
 2037                 nd6log((LOG_ERR,
 2038                     "in6_tmpifadd: ifa update succeeded, but we got "
 2039                     "no ifaddr\n"));
 2040                 return (EINVAL); /* XXX */
 2041         }
 2042         newia->ia6_ndpr = ia0->ia6_ndpr;
 2043         newia->ia6_ndpr->ndpr_refcnt++;
 2044         ifa_free(&newia->ia_ifa);
 2045 
 2046         /*
 2047          * A newly added address might affect the status of other addresses.
 2048          * XXX: when the temporary address is generated with a new public
 2049          * address, the onlink check is redundant.  However, it would be safe
 2050          * to do the check explicitly everywhere a new address is generated,
 2051          * and, in fact, we surely need the check when we create a new
 2052          * temporary address due to deprecation of an old temporary address.
 2053          */
 2054         pfxlist_onlink_check();
 2055 
 2056         return (0);
 2057 }
 2058 
 2059 static int
 2060 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
 2061 {
 2062         if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
 2063                 ndpr->ndpr_preferred = 0;
 2064         else
 2065                 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime;
 2066         if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
 2067                 ndpr->ndpr_expire = 0;
 2068         else
 2069                 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime;
 2070 
 2071         return 0;
 2072 }
 2073 
 2074 static void
 2075 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
 2076 {
 2077         /* init ia6t_expire */
 2078         if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
 2079                 lt6->ia6t_expire = 0;
 2080         else {
 2081                 lt6->ia6t_expire = time_uptime;
 2082                 lt6->ia6t_expire += lt6->ia6t_vltime;
 2083         }
 2084 
 2085         /* init ia6t_preferred */
 2086         if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
 2087                 lt6->ia6t_preferred = 0;
 2088         else {
 2089                 lt6->ia6t_preferred = time_uptime;
 2090                 lt6->ia6t_preferred += lt6->ia6t_pltime;
 2091         }
 2092 }
 2093 
 2094 /*
 2095  * Delete all the routing table entries that use the specified gateway.
 2096  * XXX: this function causes search through all entries of routing table, so
 2097  * it shouldn't be called when acting as a router.
 2098  */
 2099 void
 2100 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
 2101 {
 2102         struct radix_node_head *rnh;
 2103         u_int fibnum;
 2104 
 2105         /* We'll care only link-local addresses */
 2106         if (!IN6_IS_ADDR_LINKLOCAL(gateway))
 2107                 return;
 2108 
 2109         /* XXX Do we really need to walk any but the default FIB? */
 2110         for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
 2111                 rnh = rt_tables_get_rnh(fibnum, AF_INET6);
 2112                 if (rnh == NULL)
 2113                         continue;
 2114 
 2115                 RADIX_NODE_HEAD_LOCK(rnh);
 2116                 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
 2117                 RADIX_NODE_HEAD_UNLOCK(rnh);
 2118         }
 2119 }
 2120 
 2121 static int
 2122 rt6_deleteroute(struct radix_node *rn, void *arg)
 2123 {
 2124 #define SIN6(s) ((struct sockaddr_in6 *)s)
 2125         struct rtentry *rt = (struct rtentry *)rn;
 2126         struct in6_addr *gate = (struct in6_addr *)arg;
 2127 
 2128         if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
 2129                 return (0);
 2130 
 2131         if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) {
 2132                 return (0);
 2133         }
 2134 
 2135         /*
 2136          * Do not delete a static route.
 2137          * XXX: this seems to be a bit ad-hoc. Should we consider the
 2138          * 'cloned' bit instead?
 2139          */
 2140         if ((rt->rt_flags & RTF_STATIC) != 0)
 2141                 return (0);
 2142 
 2143         /*
 2144          * We delete only host route. This means, in particular, we don't
 2145          * delete default route.
 2146          */
 2147         if ((rt->rt_flags & RTF_HOST) == 0)
 2148                 return (0);
 2149 
 2150         return (in6_rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
 2151             rt_mask(rt), rt->rt_flags, NULL, rt->rt_fibnum));
 2152 #undef SIN6
 2153 }
 2154 
 2155 int
 2156 nd6_setdefaultiface(int ifindex)
 2157 {
 2158         int error = 0;
 2159 
 2160         if (ifindex < 0 || V_if_index < ifindex)
 2161                 return (EINVAL);
 2162         if (ifindex != 0 && !ifnet_byindex(ifindex))
 2163                 return (EINVAL);
 2164 
 2165         if (V_nd6_defifindex != ifindex) {
 2166                 V_nd6_defifindex = ifindex;
 2167                 if (V_nd6_defifindex > 0)
 2168                         V_nd6_defifp = ifnet_byindex(V_nd6_defifindex);
 2169                 else
 2170                         V_nd6_defifp = NULL;
 2171 
 2172                 /*
 2173                  * Our current implementation assumes one-to-one maping between
 2174                  * interfaces and links, so it would be natural to use the
 2175                  * default interface as the default link.
 2176                  */
 2177                 scope6_setdefault(V_nd6_defifp);
 2178         }
 2179 
 2180         return (error);
 2181 }

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