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/10.0/sys/netinet6/nd6_rtr.c 253970 2013-08-05 20:13:02Z hrs $");
   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                 ndi->chlim = nd_ra->nd_ra_curhoplimit;
  301         dr = defrtrlist_update(&dr0);
  302     }
  303 
  304         /*
  305          * prefix
  306          */
  307         if (ndopts.nd_opts_pi) {
  308                 struct nd_opt_hdr *pt;
  309                 struct nd_opt_prefix_info *pi = NULL;
  310                 struct nd_prefixctl pr;
  311 
  312                 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
  313                      pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
  314                      pt = (struct nd_opt_hdr *)((caddr_t)pt +
  315                                                 (pt->nd_opt_len << 3))) {
  316                         if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
  317                                 continue;
  318                         pi = (struct nd_opt_prefix_info *)pt;
  319 
  320                         if (pi->nd_opt_pi_len != 4) {
  321                                 nd6log((LOG_INFO,
  322                                     "nd6_ra_input: invalid option "
  323                                     "len %d for prefix information option, "
  324                                     "ignored\n", pi->nd_opt_pi_len));
  325                                 continue;
  326                         }
  327 
  328                         if (128 < pi->nd_opt_pi_prefix_len) {
  329                                 nd6log((LOG_INFO,
  330                                     "nd6_ra_input: invalid prefix "
  331                                     "len %d for prefix information option, "
  332                                     "ignored\n", pi->nd_opt_pi_prefix_len));
  333                                 continue;
  334                         }
  335 
  336                         if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
  337                          || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
  338                                 nd6log((LOG_INFO,
  339                                     "nd6_ra_input: invalid prefix "
  340                                     "%s, ignored\n",
  341                                     ip6_sprintf(ip6bufs,
  342                                         &pi->nd_opt_pi_prefix)));
  343                                 continue;
  344                         }
  345 
  346                         bzero(&pr, sizeof(pr));
  347                         pr.ndpr_prefix.sin6_family = AF_INET6;
  348                         pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
  349                         pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
  350                         pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
  351 
  352                         pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
  353                             ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
  354                         pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
  355                             ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
  356                         pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
  357                         pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
  358                         pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
  359                         (void)prelist_update(&pr, dr, m, mcast);
  360                 }
  361         }
  362 
  363         /*
  364          * MTU
  365          */
  366         if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
  367                 u_long mtu;
  368                 u_long maxmtu;
  369 
  370                 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
  371 
  372                 /* lower bound */
  373                 if (mtu < IPV6_MMTU) {
  374                         nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
  375                             "mtu=%lu sent from %s, ignoring\n",
  376                             mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src)));
  377                         goto skip;
  378                 }
  379 
  380                 /* upper bound */
  381                 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
  382                     ? ndi->maxmtu : ifp->if_mtu;
  383                 if (mtu <= maxmtu) {
  384                         int change = (ndi->linkmtu != mtu);
  385 
  386                         ndi->linkmtu = mtu;
  387                         if (change) /* in6_maxmtu may change */
  388                                 in6_setmaxmtu();
  389                 } else {
  390                         nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
  391                             "mtu=%lu sent from %s; "
  392                             "exceeds maxmtu %lu, ignoring\n",
  393                             mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu));
  394                 }
  395         }
  396 
  397  skip:
  398 
  399         /*
  400          * Source link layer address
  401          */
  402     {
  403         char *lladdr = NULL;
  404         int lladdrlen = 0;
  405 
  406         if (ndopts.nd_opts_src_lladdr) {
  407                 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
  408                 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
  409         }
  410 
  411         if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
  412                 nd6log((LOG_INFO,
  413                     "nd6_ra_input: lladdrlen mismatch for %s "
  414                     "(if %d, RA packet %d)\n", ip6_sprintf(ip6bufs, &saddr6),
  415                     ifp->if_addrlen, lladdrlen - 2));
  416                 goto bad;
  417         }
  418 
  419         nd6_cache_lladdr(ifp, &saddr6, lladdr,
  420             lladdrlen, ND_ROUTER_ADVERT, 0);
  421 
  422         /*
  423          * Installing a link-layer address might change the state of the
  424          * router's neighbor cache, which might also affect our on-link
  425          * detection of adveritsed prefixes.
  426          */
  427         pfxlist_onlink_check();
  428     }
  429 
  430  freeit:
  431         m_freem(m);
  432         return;
  433 
  434  bad:
  435         ICMP6STAT_INC(icp6s_badra);
  436         m_freem(m);
  437 }
  438 
  439 /*
  440  * default router list proccessing sub routines
  441  */
  442 
  443 /* tell the change to user processes watching the routing socket. */
  444 static void
  445 nd6_rtmsg(int cmd, struct rtentry *rt)
  446 {
  447         struct rt_addrinfo info;
  448         struct ifnet *ifp;
  449         struct ifaddr *ifa;
  450 
  451         bzero((caddr_t)&info, sizeof(info));
  452         info.rti_info[RTAX_DST] = rt_key(rt);
  453         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
  454         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
  455         ifp = rt->rt_ifp;
  456         if (ifp != NULL) {
  457                 IF_ADDR_RLOCK(ifp);
  458                 ifa = TAILQ_FIRST(&ifp->if_addrhead);
  459                 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
  460                 ifa_ref(ifa);
  461                 IF_ADDR_RUNLOCK(ifp);
  462                 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
  463         } else
  464                 ifa = NULL;
  465 
  466         rt_missmsg_fib(cmd, &info, rt->rt_flags, 0, rt->rt_fibnum);
  467         if (ifa != NULL)
  468                 ifa_free(ifa);
  469 }
  470 
  471 static void
  472 defrouter_addreq(struct nd_defrouter *new)
  473 {
  474         struct sockaddr_in6 def, mask, gate;
  475         struct rtentry *newrt = NULL;
  476         int error;
  477 
  478         bzero(&def, sizeof(def));
  479         bzero(&mask, sizeof(mask));
  480         bzero(&gate, sizeof(gate));
  481 
  482         def.sin6_len = mask.sin6_len = gate.sin6_len =
  483             sizeof(struct sockaddr_in6);
  484         def.sin6_family = gate.sin6_family = AF_INET6;
  485         gate.sin6_addr = new->rtaddr;
  486 
  487         error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&def,
  488             (struct sockaddr *)&gate, (struct sockaddr *)&mask,
  489             RTF_GATEWAY, &newrt, RT_DEFAULT_FIB);
  490         if (newrt) {
  491                 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
  492                 RTFREE(newrt);
  493         }
  494         if (error == 0)
  495                 new->installed = 1;
  496         return;
  497 }
  498 
  499 struct nd_defrouter *
  500 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
  501 {
  502         struct nd_defrouter *dr;
  503 
  504         TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
  505                 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
  506                         return (dr);
  507         }
  508 
  509         return (NULL);          /* search failed */
  510 }
  511 
  512 /*
  513  * Remove the default route for a given router.
  514  * This is just a subroutine function for defrouter_select(), and should
  515  * not be called from anywhere else.
  516  */
  517 static void
  518 defrouter_delreq(struct nd_defrouter *dr)
  519 {
  520         struct sockaddr_in6 def, mask, gate;
  521         struct rtentry *oldrt = NULL;
  522 
  523         bzero(&def, sizeof(def));
  524         bzero(&mask, sizeof(mask));
  525         bzero(&gate, sizeof(gate));
  526 
  527         def.sin6_len = mask.sin6_len = gate.sin6_len =
  528             sizeof(struct sockaddr_in6);
  529         def.sin6_family = gate.sin6_family = AF_INET6;
  530         gate.sin6_addr = dr->rtaddr;
  531 
  532         in6_rtrequest(RTM_DELETE, (struct sockaddr *)&def,
  533             (struct sockaddr *)&gate,
  534             (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt, RT_DEFAULT_FIB);
  535         if (oldrt) {
  536                 nd6_rtmsg(RTM_DELETE, oldrt);
  537                 RTFREE(oldrt);
  538         }
  539 
  540         dr->installed = 0;
  541 }
  542 
  543 /*
  544  * remove all default routes from default router list
  545  */
  546 void
  547 defrouter_reset(void)
  548 {
  549         struct nd_defrouter *dr;
  550 
  551         TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry)
  552                 defrouter_delreq(dr);
  553 
  554         /*
  555          * XXX should we also nuke any default routers in the kernel, by
  556          * going through them by rtalloc1()?
  557          */
  558 }
  559 
  560 void
  561 defrtrlist_del(struct nd_defrouter *dr)
  562 {
  563         struct nd_defrouter *deldr = NULL;
  564         struct nd_prefix *pr;
  565 
  566         /*
  567          * Flush all the routing table entries that use the router
  568          * as a next hop.
  569          */
  570         if (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV)
  571                 rt6_flush(&dr->rtaddr, dr->ifp);
  572 
  573         if (dr->installed) {
  574                 deldr = dr;
  575                 defrouter_delreq(dr);
  576         }
  577         TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
  578 
  579         /*
  580          * Also delete all the pointers to the router in each prefix lists.
  581          */
  582         LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
  583                 struct nd_pfxrouter *pfxrtr;
  584                 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
  585                         pfxrtr_del(pfxrtr);
  586         }
  587         pfxlist_onlink_check();
  588 
  589         /*
  590          * If the router is the primary one, choose a new one.
  591          * Note that defrouter_select() will remove the current gateway
  592          * from the routing table.
  593          */
  594         if (deldr)
  595                 defrouter_select();
  596 
  597         free(dr, M_IP6NDP);
  598 }
  599 
  600 /*
  601  * Default Router Selection according to Section 6.3.6 of RFC 2461 and
  602  * draft-ietf-ipngwg-router-selection:
  603  * 1) Routers that are reachable or probably reachable should be preferred.
  604  *    If we have more than one (probably) reachable router, prefer ones
  605  *    with the highest router preference.
  606  * 2) When no routers on the list are known to be reachable or
  607  *    probably reachable, routers SHOULD be selected in a round-robin
  608  *    fashion, regardless of router preference values.
  609  * 3) If the Default Router List is empty, assume that all
  610  *    destinations are on-link.
  611  *
  612  * We assume nd_defrouter is sorted by router preference value.
  613  * Since the code below covers both with and without router preference cases,
  614  * we do not need to classify the cases by ifdef.
  615  *
  616  * At this moment, we do not try to install more than one default router,
  617  * even when the multipath routing is available, because we're not sure about
  618  * the benefits for stub hosts comparing to the risk of making the code
  619  * complicated and the possibility of introducing bugs.
  620  */
  621 void
  622 defrouter_select(void)
  623 {
  624         struct nd_defrouter *dr, *selected_dr = NULL, *installed_dr = NULL;
  625         struct llentry *ln = NULL;
  626 
  627         /*
  628          * Let's handle easy case (3) first:
  629          * If default router list is empty, there's nothing to be done.
  630          */
  631         if (TAILQ_EMPTY(&V_nd_defrouter))
  632                 return;
  633 
  634         /*
  635          * Search for a (probably) reachable router from the list.
  636          * We just pick up the first reachable one (if any), assuming that
  637          * the ordering rule of the list described in defrtrlist_update().
  638          */
  639         TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
  640                 IF_AFDATA_RLOCK(dr->ifp);
  641                 if (selected_dr == NULL &&
  642                     (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
  643                     ND6_IS_LLINFO_PROBREACH(ln)) {
  644                         selected_dr = dr;
  645                 }
  646                 IF_AFDATA_RUNLOCK(dr->ifp);
  647                 if (ln != NULL) {
  648                         LLE_RUNLOCK(ln);
  649                         ln = NULL;
  650                 }
  651 
  652                 if (dr->installed && installed_dr == NULL)
  653                         installed_dr = dr;
  654                 else if (dr->installed && installed_dr) {
  655                         /* this should not happen.  warn for diagnosis. */
  656                         log(LOG_ERR, "defrouter_select: more than one router"
  657                             " is installed\n");
  658                 }
  659         }
  660         /*
  661          * If none of the default routers was found to be reachable,
  662          * round-robin the list regardless of preference.
  663          * Otherwise, if we have an installed router, check if the selected
  664          * (reachable) router should really be preferred to the installed one.
  665          * We only prefer the new router when the old one is not reachable
  666          * or when the new one has a really higher preference value.
  667          */
  668         if (selected_dr == NULL) {
  669                 if (installed_dr == NULL || !TAILQ_NEXT(installed_dr, dr_entry))
  670                         selected_dr = TAILQ_FIRST(&V_nd_defrouter);
  671                 else
  672                         selected_dr = TAILQ_NEXT(installed_dr, dr_entry);
  673         } else if (installed_dr) {
  674                 IF_AFDATA_RLOCK(installed_dr->ifp);
  675                 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0, installed_dr->ifp)) &&
  676                     ND6_IS_LLINFO_PROBREACH(ln) &&
  677                     rtpref(selected_dr) <= rtpref(installed_dr)) {
  678                         selected_dr = installed_dr;
  679                 }
  680                 IF_AFDATA_RUNLOCK(installed_dr->ifp);
  681                 if (ln != NULL)
  682                         LLE_RUNLOCK(ln);
  683         }
  684 
  685         /*
  686          * If the selected router is different than the installed one,
  687          * remove the installed router and install the selected one.
  688          * Note that the selected router is never NULL here.
  689          */
  690         if (installed_dr != selected_dr) {
  691                 if (installed_dr)
  692                         defrouter_delreq(installed_dr);
  693                 defrouter_addreq(selected_dr);
  694         }
  695 
  696         return;
  697 }
  698 
  699 /*
  700  * for default router selection
  701  * regards router-preference field as a 2-bit signed integer
  702  */
  703 static int
  704 rtpref(struct nd_defrouter *dr)
  705 {
  706         switch (dr->flags & ND_RA_FLAG_RTPREF_MASK) {
  707         case ND_RA_FLAG_RTPREF_HIGH:
  708                 return (RTPREF_HIGH);
  709         case ND_RA_FLAG_RTPREF_MEDIUM:
  710         case ND_RA_FLAG_RTPREF_RSV:
  711                 return (RTPREF_MEDIUM);
  712         case ND_RA_FLAG_RTPREF_LOW:
  713                 return (RTPREF_LOW);
  714         default:
  715                 /*
  716                  * This case should never happen.  If it did, it would mean a
  717                  * serious bug of kernel internal.  We thus always bark here.
  718                  * Or, can we even panic?
  719                  */
  720                 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->flags);
  721                 return (RTPREF_INVALID);
  722         }
  723         /* NOTREACHED */
  724 }
  725 
  726 static struct nd_defrouter *
  727 defrtrlist_update(struct nd_defrouter *new)
  728 {
  729         struct nd_defrouter *dr, *n;
  730 
  731         if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
  732                 /* entry exists */
  733                 if (new->rtlifetime == 0) {
  734                         defrtrlist_del(dr);
  735                         dr = NULL;
  736                 } else {
  737                         int oldpref = rtpref(dr);
  738 
  739                         /* override */
  740                         dr->flags = new->flags; /* xxx flag check */
  741                         dr->rtlifetime = new->rtlifetime;
  742                         dr->expire = new->expire;
  743 
  744                         /*
  745                          * If the preference does not change, there's no need
  746                          * to sort the entries. Also make sure the selected
  747                          * router is still installed in the kernel.
  748                          */
  749                         if (dr->installed && rtpref(new) == oldpref)
  750                                 return (dr);
  751 
  752                         /*
  753                          * preferred router may be changed, so relocate
  754                          * this router.
  755                          * XXX: calling TAILQ_REMOVE directly is a bad manner.
  756                          * However, since defrtrlist_del() has many side
  757                          * effects, we intentionally do so here.
  758                          * defrouter_select() below will handle routing
  759                          * changes later.
  760                          */
  761                         TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
  762                         n = dr;
  763                         goto insert;
  764                 }
  765                 return (dr);
  766         }
  767 
  768         /* entry does not exist */
  769         if (new->rtlifetime == 0)
  770                 return (NULL);
  771 
  772         n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
  773         if (n == NULL)
  774                 return (NULL);
  775         bzero(n, sizeof(*n));
  776         *n = *new;
  777 
  778 insert:
  779         /*
  780          * Insert the new router in the Default Router List;
  781          * The Default Router List should be in the descending order
  782          * of router-preferece.  Routers with the same preference are
  783          * sorted in the arriving time order.
  784          */
  785 
  786         /* insert at the end of the group */
  787         TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
  788                 if (rtpref(n) > rtpref(dr))
  789                         break;
  790         }
  791         if (dr)
  792                 TAILQ_INSERT_BEFORE(dr, n, dr_entry);
  793         else
  794                 TAILQ_INSERT_TAIL(&V_nd_defrouter, n, dr_entry);
  795 
  796         defrouter_select();
  797 
  798         return (n);
  799 }
  800 
  801 static struct nd_pfxrouter *
  802 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
  803 {
  804         struct nd_pfxrouter *search;
  805 
  806         LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) {
  807                 if (search->router == dr)
  808                         break;
  809         }
  810 
  811         return (search);
  812 }
  813 
  814 static void
  815 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
  816 {
  817         struct nd_pfxrouter *new;
  818 
  819         new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
  820         if (new == NULL)
  821                 return;
  822         bzero(new, sizeof(*new));
  823         new->router = dr;
  824 
  825         LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
  826 
  827         pfxlist_onlink_check();
  828 }
  829 
  830 static void
  831 pfxrtr_del(struct nd_pfxrouter *pfr)
  832 {
  833         LIST_REMOVE(pfr, pfr_entry);
  834         free(pfr, M_IP6NDP);
  835 }
  836 
  837 struct nd_prefix *
  838 nd6_prefix_lookup(struct nd_prefixctl *key)
  839 {
  840         struct nd_prefix *search;
  841 
  842         LIST_FOREACH(search, &V_nd_prefix, ndpr_entry) {
  843                 if (key->ndpr_ifp == search->ndpr_ifp &&
  844                     key->ndpr_plen == search->ndpr_plen &&
  845                     in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr,
  846                     &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) {
  847                         break;
  848                 }
  849         }
  850 
  851         return (search);
  852 }
  853 
  854 int
  855 nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr,
  856     struct nd_prefix **newp)
  857 {
  858         struct nd_prefix *new = NULL;
  859         int error = 0;
  860         int i;
  861         char ip6buf[INET6_ADDRSTRLEN];
  862 
  863         new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
  864         if (new == NULL)
  865                 return(ENOMEM);
  866         bzero(new, sizeof(*new));
  867         new->ndpr_ifp = pr->ndpr_ifp;
  868         new->ndpr_prefix = pr->ndpr_prefix;
  869         new->ndpr_plen = pr->ndpr_plen;
  870         new->ndpr_vltime = pr->ndpr_vltime;
  871         new->ndpr_pltime = pr->ndpr_pltime;
  872         new->ndpr_flags = pr->ndpr_flags;
  873         if ((error = in6_init_prefix_ltimes(new)) != 0) {
  874                 free(new, M_IP6NDP);
  875                 return(error);
  876         }
  877         new->ndpr_lastupdate = time_uptime;
  878         if (newp != NULL)
  879                 *newp = new;
  880 
  881         /* initialization */
  882         LIST_INIT(&new->ndpr_advrtrs);
  883         in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
  884         /* make prefix in the canonical form */
  885         for (i = 0; i < 4; i++)
  886                 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
  887                     new->ndpr_mask.s6_addr32[i];
  888 
  889         /* link ndpr_entry to nd_prefix list */
  890         LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry);
  891 
  892         /* ND_OPT_PI_FLAG_ONLINK processing */
  893         if (new->ndpr_raf_onlink) {
  894                 int e;
  895 
  896                 if ((e = nd6_prefix_onlink(new)) != 0) {
  897                         nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
  898                             "the prefix %s/%d on-link on %s (errno=%d)\n",
  899                             ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
  900                             pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  901                         /* proceed anyway. XXX: is it correct? */
  902                 }
  903         }
  904 
  905         if (dr)
  906                 pfxrtr_add(new, dr);
  907 
  908         return 0;
  909 }
  910 
  911 void
  912 prelist_remove(struct nd_prefix *pr)
  913 {
  914         struct nd_pfxrouter *pfr, *next;
  915         int e;
  916         char ip6buf[INET6_ADDRSTRLEN];
  917 
  918         /* make sure to invalidate the prefix until it is really freed. */
  919         pr->ndpr_vltime = 0;
  920         pr->ndpr_pltime = 0;
  921 
  922         /*
  923          * Though these flags are now meaningless, we'd rather keep the value
  924          * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users
  925          * when executing "ndp -p".
  926          */
  927 
  928         if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
  929             (e = nd6_prefix_offlink(pr)) != 0) {
  930                 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
  931                     "on %s, errno=%d\n",
  932                     ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
  933                     pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  934                 /* what should we do? */
  935         }
  936 
  937         if (pr->ndpr_refcnt > 0)
  938                 return;         /* notice here? */
  939 
  940         /* unlink ndpr_entry from nd_prefix list */
  941         LIST_REMOVE(pr, ndpr_entry);
  942 
  943         /* free list of routers that adversed the prefix */
  944         LIST_FOREACH_SAFE(pfr, &pr->ndpr_advrtrs, pfr_entry, next) {
  945                 free(pfr, M_IP6NDP);
  946         }
  947         free(pr, M_IP6NDP);
  948 
  949         pfxlist_onlink_check();
  950 }
  951 
  952 /*
  953  * dr - may be NULL
  954  */
  955 
  956 static int
  957 prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
  958     struct mbuf *m, int mcast)
  959 {
  960         struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
  961         struct ifaddr *ifa;
  962         struct ifnet *ifp = new->ndpr_ifp;
  963         struct nd_prefix *pr;
  964         int error = 0;
  965         int newprefix = 0;
  966         int auth;
  967         struct in6_addrlifetime lt6_tmp;
  968         char ip6buf[INET6_ADDRSTRLEN];
  969 
  970         auth = 0;
  971         if (m) {
  972                 /*
  973                  * Authenticity for NA consists authentication for
  974                  * both IP header and IP datagrams, doesn't it ?
  975                  */
  976 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
  977                 auth = ((m->m_flags & M_AUTHIPHDR) &&
  978                     (m->m_flags & M_AUTHIPDGM));
  979 #endif
  980         }
  981 
  982         if ((pr = nd6_prefix_lookup(new)) != NULL) {
  983                 /*
  984                  * nd6_prefix_lookup() ensures that pr and new have the same
  985                  * prefix on a same interface.
  986                  */
  987 
  988                 /*
  989                  * Update prefix information.  Note that the on-link (L) bit
  990                  * and the autonomous (A) bit should NOT be changed from 1
  991                  * to 0.
  992                  */
  993                 if (new->ndpr_raf_onlink == 1)
  994                         pr->ndpr_raf_onlink = 1;
  995                 if (new->ndpr_raf_auto == 1)
  996                         pr->ndpr_raf_auto = 1;
  997                 if (new->ndpr_raf_onlink) {
  998                         pr->ndpr_vltime = new->ndpr_vltime;
  999                         pr->ndpr_pltime = new->ndpr_pltime;
 1000                         (void)in6_init_prefix_ltimes(pr); /* XXX error case? */
 1001                         pr->ndpr_lastupdate = time_uptime;
 1002                 }
 1003 
 1004                 if (new->ndpr_raf_onlink &&
 1005                     (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
 1006                         int e;
 1007 
 1008                         if ((e = nd6_prefix_onlink(pr)) != 0) {
 1009                                 nd6log((LOG_ERR,
 1010                                     "prelist_update: failed to make "
 1011                                     "the prefix %s/%d on-link on %s "
 1012                                     "(errno=%d)\n",
 1013                                     ip6_sprintf(ip6buf,
 1014                                             &pr->ndpr_prefix.sin6_addr),
 1015                                     pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
 1016                                 /* proceed anyway. XXX: is it correct? */
 1017                         }
 1018                 }
 1019 
 1020                 if (dr && pfxrtr_lookup(pr, dr) == NULL)
 1021                         pfxrtr_add(pr, dr);
 1022         } else {
 1023                 struct nd_prefix *newpr = NULL;
 1024 
 1025                 newprefix = 1;
 1026 
 1027                 if (new->ndpr_vltime == 0)
 1028                         goto end;
 1029                 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
 1030                         goto end;
 1031 
 1032                 error = nd6_prelist_add(new, dr, &newpr);
 1033                 if (error != 0 || newpr == NULL) {
 1034                         nd6log((LOG_NOTICE, "prelist_update: "
 1035                             "nd6_prelist_add failed for %s/%d on %s "
 1036                             "errno=%d, returnpr=%p\n",
 1037                             ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr),
 1038                             new->ndpr_plen, if_name(new->ndpr_ifp),
 1039                             error, newpr));
 1040                         goto end; /* we should just give up in this case. */
 1041                 }
 1042 
 1043                 /*
 1044                  * XXX: from the ND point of view, we can ignore a prefix
 1045                  * with the on-link bit being zero.  However, we need a
 1046                  * prefix structure for references from autoconfigured
 1047                  * addresses.  Thus, we explicitly make sure that the prefix
 1048                  * itself expires now.
 1049                  */
 1050                 if (newpr->ndpr_raf_onlink == 0) {
 1051                         newpr->ndpr_vltime = 0;
 1052                         newpr->ndpr_pltime = 0;
 1053                         in6_init_prefix_ltimes(newpr);
 1054                 }
 1055 
 1056                 pr = newpr;
 1057         }
 1058 
 1059         /*
 1060          * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
 1061          * Note that pr must be non NULL at this point.
 1062          */
 1063 
 1064         /* 5.5.3 (a). Ignore the prefix without the A bit set. */
 1065         if (!new->ndpr_raf_auto)
 1066                 goto end;
 1067 
 1068         /*
 1069          * 5.5.3 (b). the link-local prefix should have been ignored in
 1070          * nd6_ra_input.
 1071          */
 1072 
 1073         /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */
 1074         if (new->ndpr_pltime > new->ndpr_vltime) {
 1075                 error = EINVAL; /* XXX: won't be used */
 1076                 goto end;
 1077         }
 1078 
 1079         /*
 1080          * 5.5.3 (d).  If the prefix advertised is not equal to the prefix of
 1081          * an address configured by stateless autoconfiguration already in the
 1082          * list of addresses associated with the interface, and the Valid
 1083          * Lifetime is not 0, form an address.  We first check if we have
 1084          * a matching prefix.
 1085          * Note: we apply a clarification in rfc2462bis-02 here.  We only
 1086          * consider autoconfigured addresses while RFC2462 simply said
 1087          * "address".
 1088          */
 1089         IF_ADDR_RLOCK(ifp);
 1090         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1091                 struct in6_ifaddr *ifa6;
 1092                 u_int32_t remaininglifetime;
 1093 
 1094                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1095                         continue;
 1096 
 1097                 ifa6 = (struct in6_ifaddr *)ifa;
 1098 
 1099                 /*
 1100                  * We only consider autoconfigured addresses as per rfc2462bis.
 1101                  */
 1102                 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
 1103                         continue;
 1104 
 1105                 /*
 1106                  * Spec is not clear here, but I believe we should concentrate
 1107                  * on unicast (i.e. not anycast) addresses.
 1108                  * XXX: other ia6_flags? detached or duplicated?
 1109                  */
 1110                 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
 1111                         continue;
 1112 
 1113                 /*
 1114                  * Ignore the address if it is not associated with a prefix
 1115                  * or is associated with a prefix that is different from this
 1116                  * one.  (pr is never NULL here)
 1117                  */
 1118                 if (ifa6->ia6_ndpr != pr)
 1119                         continue;
 1120 
 1121                 if (ia6_match == NULL) /* remember the first one */
 1122                         ia6_match = ifa6;
 1123 
 1124                 /*
 1125                  * An already autoconfigured address matched.  Now that we
 1126                  * are sure there is at least one matched address, we can
 1127                  * proceed to 5.5.3. (e): update the lifetimes according to the
 1128                  * "two hours" rule and the privacy extension.
 1129                  * We apply some clarifications in rfc2462bis:
 1130                  * - use remaininglifetime instead of storedlifetime as a
 1131                  *   variable name
 1132                  * - remove the dead code in the "two-hour" rule
 1133                  */
 1134 #define TWOHOUR         (120*60)
 1135                 lt6_tmp = ifa6->ia6_lifetime;
 1136 
 1137                 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
 1138                         remaininglifetime = ND6_INFINITE_LIFETIME;
 1139                 else if (time_uptime - ifa6->ia6_updatetime >
 1140                          lt6_tmp.ia6t_vltime) {
 1141                         /*
 1142                          * The case of "invalid" address.  We should usually
 1143                          * not see this case.
 1144                          */
 1145                         remaininglifetime = 0;
 1146                 } else
 1147                         remaininglifetime = lt6_tmp.ia6t_vltime -
 1148                             (time_uptime - ifa6->ia6_updatetime);
 1149 
 1150                 /* when not updating, keep the current stored lifetime. */
 1151                 lt6_tmp.ia6t_vltime = remaininglifetime;
 1152 
 1153                 if (TWOHOUR < new->ndpr_vltime ||
 1154                     remaininglifetime < new->ndpr_vltime) {
 1155                         lt6_tmp.ia6t_vltime = new->ndpr_vltime;
 1156                 } else if (remaininglifetime <= TWOHOUR) {
 1157                         if (auth) {
 1158                                 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
 1159                         }
 1160                 } else {
 1161                         /*
 1162                          * new->ndpr_vltime <= TWOHOUR &&
 1163                          * TWOHOUR < remaininglifetime
 1164                          */
 1165                         lt6_tmp.ia6t_vltime = TWOHOUR;
 1166                 }
 1167 
 1168                 /* The 2 hour rule is not imposed for preferred lifetime. */
 1169                 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
 1170 
 1171                 in6_init_address_ltimes(pr, &lt6_tmp);
 1172 
 1173                 /*
 1174                  * We need to treat lifetimes for temporary addresses
 1175                  * differently, according to
 1176                  * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
 1177                  * we only update the lifetimes when they are in the maximum
 1178                  * intervals.
 1179                  */
 1180                 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
 1181                         u_int32_t maxvltime, maxpltime;
 1182 
 1183                         if (V_ip6_temp_valid_lifetime >
 1184                             (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
 1185                             V_ip6_desync_factor)) {
 1186                                 maxvltime = V_ip6_temp_valid_lifetime -
 1187                                     (time_uptime - ifa6->ia6_createtime) -
 1188                                     V_ip6_desync_factor;
 1189                         } else
 1190                                 maxvltime = 0;
 1191                         if (V_ip6_temp_preferred_lifetime >
 1192                             (u_int32_t)((time_uptime - ifa6->ia6_createtime) +
 1193                             V_ip6_desync_factor)) {
 1194                                 maxpltime = V_ip6_temp_preferred_lifetime -
 1195                                     (time_uptime - ifa6->ia6_createtime) -
 1196                                     V_ip6_desync_factor;
 1197                         } else
 1198                                 maxpltime = 0;
 1199 
 1200                         if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
 1201                             lt6_tmp.ia6t_vltime > maxvltime) {
 1202                                 lt6_tmp.ia6t_vltime = maxvltime;
 1203                         }
 1204                         if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
 1205                             lt6_tmp.ia6t_pltime > maxpltime) {
 1206                                 lt6_tmp.ia6t_pltime = maxpltime;
 1207                         }
 1208                 }
 1209                 ifa6->ia6_lifetime = lt6_tmp;
 1210                 ifa6->ia6_updatetime = time_uptime;
 1211         }
 1212         IF_ADDR_RUNLOCK(ifp);
 1213         if (ia6_match == NULL && new->ndpr_vltime) {
 1214                 int ifidlen;
 1215 
 1216                 /*
 1217                  * 5.5.3 (d) (continued)
 1218                  * No address matched and the valid lifetime is non-zero.
 1219                  * Create a new address.
 1220                  */
 1221 
 1222                 /*
 1223                  * Prefix Length check:
 1224                  * If the sum of the prefix length and interface identifier
 1225                  * length does not equal 128 bits, the Prefix Information
 1226                  * option MUST be ignored.  The length of the interface
 1227                  * identifier is defined in a separate link-type specific
 1228                  * document.
 1229                  */
 1230                 ifidlen = in6_if2idlen(ifp);
 1231                 if (ifidlen < 0) {
 1232                         /* this should not happen, so we always log it. */
 1233                         log(LOG_ERR, "prelist_update: IFID undefined (%s)\n",
 1234                             if_name(ifp));
 1235                         goto end;
 1236                 }
 1237                 if (ifidlen + pr->ndpr_plen != 128) {
 1238                         nd6log((LOG_INFO,
 1239                             "prelist_update: invalid prefixlen "
 1240                             "%d for %s, ignored\n",
 1241                             pr->ndpr_plen, if_name(ifp)));
 1242                         goto end;
 1243                 }
 1244 
 1245                 if ((ia6 = in6_ifadd(new, mcast)) != NULL) {
 1246                         /*
 1247                          * note that we should use pr (not new) for reference.
 1248                          */
 1249                         pr->ndpr_refcnt++;
 1250                         ia6->ia6_ndpr = pr;
 1251 
 1252                         /*
 1253                          * RFC 3041 3.3 (2).
 1254                          * When a new public address is created as described
 1255                          * in RFC2462, also create a new temporary address.
 1256                          *
 1257                          * RFC 3041 3.5.
 1258                          * When an interface connects to a new link, a new
 1259                          * randomized interface identifier should be generated
 1260                          * immediately together with a new set of temporary
 1261                          * addresses.  Thus, we specifiy 1 as the 2nd arg of
 1262                          * in6_tmpifadd().
 1263                          */
 1264                         if (V_ip6_use_tempaddr) {
 1265                                 int e;
 1266                                 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
 1267                                         nd6log((LOG_NOTICE, "prelist_update: "
 1268                                             "failed to create a temporary "
 1269                                             "address, errno=%d\n",
 1270                                             e));
 1271                                 }
 1272                         }
 1273                         ifa_free(&ia6->ia_ifa);
 1274 
 1275                         /*
 1276                          * A newly added address might affect the status
 1277                          * of other addresses, so we check and update it.
 1278                          * XXX: what if address duplication happens?
 1279                          */
 1280                         pfxlist_onlink_check();
 1281                 } else {
 1282                         /* just set an error. do not bark here. */
 1283                         error = EADDRNOTAVAIL; /* XXX: might be unused. */
 1284                 }
 1285         }
 1286 
 1287  end:
 1288         return error;
 1289 }
 1290 
 1291 /*
 1292  * A supplement function used in the on-link detection below;
 1293  * detect if a given prefix has a (probably) reachable advertising router.
 1294  * XXX: lengthy function name...
 1295  */
 1296 static struct nd_pfxrouter *
 1297 find_pfxlist_reachable_router(struct nd_prefix *pr)
 1298 {
 1299         struct nd_pfxrouter *pfxrtr;
 1300         struct llentry *ln;
 1301         int canreach;
 1302 
 1303         LIST_FOREACH(pfxrtr, &pr->ndpr_advrtrs, pfr_entry) {
 1304                 IF_AFDATA_RLOCK(pfxrtr->router->ifp);
 1305                 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
 1306                 IF_AFDATA_RUNLOCK(pfxrtr->router->ifp);
 1307                 if (ln == NULL)
 1308                         continue;
 1309                 canreach = ND6_IS_LLINFO_PROBREACH(ln);
 1310                 LLE_RUNLOCK(ln);
 1311                 if (canreach)
 1312                         break;
 1313         }
 1314         return (pfxrtr);
 1315 }
 1316 
 1317 /*
 1318  * Check if each prefix in the prefix list has at least one available router
 1319  * that advertised the prefix (a router is "available" if its neighbor cache
 1320  * entry is reachable or probably reachable).
 1321  * If the check fails, the prefix may be off-link, because, for example,
 1322  * we have moved from the network but the lifetime of the prefix has not
 1323  * expired yet.  So we should not use the prefix if there is another prefix
 1324  * that has an available router.
 1325  * But, if there is no prefix that has an available router, we still regards
 1326  * all the prefixes as on-link.  This is because we can't tell if all the
 1327  * routers are simply dead or if we really moved from the network and there
 1328  * is no router around us.
 1329  */
 1330 void
 1331 pfxlist_onlink_check()
 1332 {
 1333         struct nd_prefix *pr;
 1334         struct in6_ifaddr *ifa;
 1335         struct nd_defrouter *dr;
 1336         struct nd_pfxrouter *pfxrtr = NULL;
 1337 
 1338         /*
 1339          * Check if there is a prefix that has a reachable advertising
 1340          * router.
 1341          */
 1342         LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
 1343                 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
 1344                         break;
 1345         }
 1346 
 1347         /*
 1348          * If we have no such prefix, check whether we still have a router
 1349          * that does not advertise any prefixes.
 1350          */
 1351         if (pr == NULL) {
 1352                 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
 1353                         struct nd_prefix *pr0;
 1354 
 1355                         LIST_FOREACH(pr0, &V_nd_prefix, ndpr_entry) {
 1356                                 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
 1357                                         break;
 1358                         }
 1359                         if (pfxrtr != NULL)
 1360                                 break;
 1361                 }
 1362         }
 1363         if (pr != NULL || (!TAILQ_EMPTY(&V_nd_defrouter) && pfxrtr == NULL)) {
 1364                 /*
 1365                  * There is at least one prefix that has a reachable router,
 1366                  * or at least a router which probably does not advertise
 1367                  * any prefixes.  The latter would be the case when we move
 1368                  * to a new link where we have a router that does not provide
 1369                  * prefixes and we configure an address by hand.
 1370                  * Detach prefixes which have no reachable advertising
 1371                  * router, and attach other prefixes.
 1372                  */
 1373                 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
 1374                         /* XXX: a link-local prefix should never be detached */
 1375                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1376                                 continue;
 1377 
 1378                         /*
 1379                          * we aren't interested in prefixes without the L bit
 1380                          * set.
 1381                          */
 1382                         if (pr->ndpr_raf_onlink == 0)
 1383                                 continue;
 1384 
 1385                         if (pr->ndpr_raf_auto == 0)
 1386                                 continue;
 1387 
 1388                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
 1389                             find_pfxlist_reachable_router(pr) == NULL)
 1390                                 pr->ndpr_stateflags |= NDPRF_DETACHED;
 1391                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
 1392                             find_pfxlist_reachable_router(pr) != 0)
 1393                                 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
 1394                 }
 1395         } else {
 1396                 /* there is no prefix that has a reachable router */
 1397                 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
 1398                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1399                                 continue;
 1400 
 1401                         if (pr->ndpr_raf_onlink == 0)
 1402                                 continue;
 1403 
 1404                         if (pr->ndpr_raf_auto == 0)
 1405                                 continue;
 1406 
 1407                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
 1408                                 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
 1409                 }
 1410         }
 1411 
 1412         /*
 1413          * Remove each interface route associated with a (just) detached
 1414          * prefix, and reinstall the interface route for a (just) attached
 1415          * prefix.  Note that all attempt of reinstallation does not
 1416          * necessarily success, when a same prefix is shared among multiple
 1417          * interfaces.  Such cases will be handled in nd6_prefix_onlink,
 1418          * so we don't have to care about them.
 1419          */
 1420         LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
 1421                 int e;
 1422                 char ip6buf[INET6_ADDRSTRLEN];
 1423 
 1424                 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1425                         continue;
 1426 
 1427                 if (pr->ndpr_raf_onlink == 0)
 1428                         continue;
 1429 
 1430                 if (pr->ndpr_raf_auto == 0)
 1431                         continue;
 1432 
 1433                 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
 1434                     (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
 1435                         if ((e = nd6_prefix_offlink(pr)) != 0) {
 1436                                 nd6log((LOG_ERR,
 1437                                     "pfxlist_onlink_check: failed to "
 1438                                     "make %s/%d offlink, errno=%d\n",
 1439                                     ip6_sprintf(ip6buf,
 1440                                             &pr->ndpr_prefix.sin6_addr),
 1441                                             pr->ndpr_plen, e));
 1442                         }
 1443                 }
 1444                 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
 1445                     (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
 1446                     pr->ndpr_raf_onlink) {
 1447                         if ((e = nd6_prefix_onlink(pr)) != 0) {
 1448                                 nd6log((LOG_ERR,
 1449                                     "pfxlist_onlink_check: failed to "
 1450                                     "make %s/%d onlink, errno=%d\n",
 1451                                     ip6_sprintf(ip6buf,
 1452                                             &pr->ndpr_prefix.sin6_addr),
 1453                                             pr->ndpr_plen, e));
 1454                         }
 1455                 }
 1456         }
 1457 
 1458         /*
 1459          * Changes on the prefix status might affect address status as well.
 1460          * Make sure that all addresses derived from an attached prefix are
 1461          * attached, and that all addresses derived from a detached prefix are
 1462          * detached.  Note, however, that a manually configured address should
 1463          * always be attached.
 1464          * The precise detection logic is same as the one for prefixes.
 1465          *
 1466          * XXXRW: in6_ifaddrhead locking.
 1467          */
 1468         TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
 1469                 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
 1470                         continue;
 1471 
 1472                 if (ifa->ia6_ndpr == NULL) {
 1473                         /*
 1474                          * This can happen when we first configure the address
 1475                          * (i.e. the address exists, but the prefix does not).
 1476                          * XXX: complicated relationships...
 1477                          */
 1478                         continue;
 1479                 }
 1480 
 1481                 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
 1482                         break;
 1483         }
 1484         if (ifa) {
 1485                 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
 1486                         if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1487                                 continue;
 1488 
 1489                         if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
 1490                                 continue;
 1491 
 1492                         if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) {
 1493                                 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
 1494                                         ifa->ia6_flags &= ~IN6_IFF_DETACHED;
 1495                                         ifa->ia6_flags |= IN6_IFF_TENTATIVE;
 1496                                         nd6_dad_start((struct ifaddr *)ifa, 0);
 1497                                 }
 1498                         } else {
 1499                                 ifa->ia6_flags |= IN6_IFF_DETACHED;
 1500                         }
 1501                 }
 1502         }
 1503         else {
 1504                 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
 1505                         if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1506                                 continue;
 1507 
 1508                         if (ifa->ia6_flags & IN6_IFF_DETACHED) {
 1509                                 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
 1510                                 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
 1511                                 /* Do we need a delay in this case? */
 1512                                 nd6_dad_start((struct ifaddr *)ifa, 0);
 1513                         }
 1514                 }
 1515         }
 1516 }
 1517 
 1518 static int
 1519 nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa)
 1520 {
 1521         static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
 1522         struct radix_node_head *rnh;
 1523         struct rtentry *rt;
 1524         struct sockaddr_in6 mask6;
 1525         u_long rtflags;
 1526         int error, a_failure, fibnum;
 1527 
 1528         /*
 1529          * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
 1530          * ifa->ifa_rtrequest = nd6_rtrequest;
 1531          */
 1532         bzero(&mask6, sizeof(mask6));
 1533         mask6.sin6_len = sizeof(mask6);
 1534         mask6.sin6_addr = pr->ndpr_mask;
 1535         rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP;
 1536 
 1537         a_failure = 0;
 1538         for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
 1539 
 1540                 rt = NULL;
 1541                 error = in6_rtrequest(RTM_ADD,
 1542                     (struct sockaddr *)&pr->ndpr_prefix, ifa->ifa_addr,
 1543                     (struct sockaddr *)&mask6, rtflags, &rt, fibnum);
 1544                 if (error == 0) {
 1545                         KASSERT(rt != NULL, ("%s: in6_rtrequest return no "
 1546                             "error(%d) but rt is NULL, pr=%p, ifa=%p", __func__,
 1547                             error, pr, ifa));
 1548 
 1549                         rnh = rt_tables_get_rnh(rt->rt_fibnum, AF_INET6);
 1550                         /* XXX what if rhn == NULL? */
 1551                         RADIX_NODE_HEAD_LOCK(rnh);
 1552                         RT_LOCK(rt);
 1553                         if (rt_setgate(rt, rt_key(rt),
 1554                             (struct sockaddr *)&null_sdl) == 0) {
 1555                                 struct sockaddr_dl *dl;
 1556 
 1557                                 dl = (struct sockaddr_dl *)rt->rt_gateway;
 1558                                 dl->sdl_type = rt->rt_ifp->if_type;
 1559                                 dl->sdl_index = rt->rt_ifp->if_index;
 1560                         }
 1561                         RADIX_NODE_HEAD_UNLOCK(rnh);
 1562                         nd6_rtmsg(RTM_ADD, rt);
 1563                         RT_UNLOCK(rt);
 1564                         pr->ndpr_stateflags |= NDPRF_ONLINK;
 1565                 } else {
 1566                         char ip6buf[INET6_ADDRSTRLEN];
 1567                         char ip6bufg[INET6_ADDRSTRLEN];
 1568                         char ip6bufm[INET6_ADDRSTRLEN];
 1569                         struct sockaddr_in6 *sin6;
 1570 
 1571                         sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
 1572                         nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add "
 1573                             "route for a prefix (%s/%d) on %s, gw=%s, mask=%s, "
 1574                             "flags=%lx errno = %d\n",
 1575                             ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
 1576                             pr->ndpr_plen, if_name(pr->ndpr_ifp),
 1577                             ip6_sprintf(ip6bufg, &sin6->sin6_addr),
 1578                             ip6_sprintf(ip6bufm, &mask6.sin6_addr),
 1579                             rtflags, error));
 1580 
 1581                         /* Save last error to return, see rtinit(). */
 1582                         a_failure = error;
 1583                 }
 1584 
 1585                 if (rt != NULL) {
 1586                         RT_LOCK(rt);
 1587                         RT_REMREF(rt);
 1588                         RT_UNLOCK(rt);
 1589                 }
 1590         }
 1591 
 1592         /* Return the last error we got. */
 1593         return (a_failure);
 1594 }
 1595 
 1596 static int
 1597 nd6_prefix_onlink(struct nd_prefix *pr)
 1598 {
 1599         struct ifaddr *ifa;
 1600         struct ifnet *ifp = pr->ndpr_ifp;
 1601         struct nd_prefix *opr;
 1602         int error = 0;
 1603         char ip6buf[INET6_ADDRSTRLEN];
 1604 
 1605         /* sanity check */
 1606         if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
 1607                 nd6log((LOG_ERR,
 1608                     "nd6_prefix_onlink: %s/%d is already on-link\n",
 1609                     ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
 1610                     pr->ndpr_plen));
 1611                 return (EEXIST);
 1612         }
 1613 
 1614         /*
 1615          * Add the interface route associated with the prefix.  Before
 1616          * installing the route, check if there's the same prefix on another
 1617          * interface, and the prefix has already installed the interface route.
 1618          * Although such a configuration is expected to be rare, we explicitly
 1619          * allow it.
 1620          */
 1621         LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
 1622                 if (opr == pr)
 1623                         continue;
 1624 
 1625                 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
 1626                         continue;
 1627 
 1628                 if (opr->ndpr_plen == pr->ndpr_plen &&
 1629                     in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
 1630                     &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen))
 1631                         return (0);
 1632         }
 1633 
 1634         /*
 1635          * We prefer link-local addresses as the associated interface address.
 1636          */
 1637         /* search for a link-local addr */
 1638         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
 1639             IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
 1640         if (ifa == NULL) {
 1641                 /* XXX: freebsd does not have ifa_ifwithaf */
 1642                 IF_ADDR_RLOCK(ifp);
 1643                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1644                         if (ifa->ifa_addr->sa_family == AF_INET6)
 1645                                 break;
 1646                 }
 1647                 if (ifa != NULL)
 1648                         ifa_ref(ifa);
 1649                 IF_ADDR_RUNLOCK(ifp);
 1650                 /* should we care about ia6_flags? */
 1651         }
 1652         if (ifa == NULL) {
 1653                 /*
 1654                  * This can still happen, when, for example, we receive an RA
 1655                  * containing a prefix with the L bit set and the A bit clear,
 1656                  * after removing all IPv6 addresses on the receiving
 1657                  * interface.  This should, of course, be rare though.
 1658                  */
 1659                 nd6log((LOG_NOTICE,
 1660                     "nd6_prefix_onlink: failed to find any ifaddr"
 1661                     " to add route for a prefix(%s/%d) on %s\n",
 1662                     ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
 1663                     pr->ndpr_plen, if_name(ifp)));
 1664                 return (0);
 1665         }
 1666 
 1667         error = nd6_prefix_onlink_rtrequest(pr, ifa);
 1668 
 1669         if (ifa != NULL)
 1670                 ifa_free(ifa);
 1671 
 1672         return (error);
 1673 }
 1674 
 1675 static int
 1676 nd6_prefix_offlink(struct nd_prefix *pr)
 1677 {
 1678         int error = 0;
 1679         struct ifnet *ifp = pr->ndpr_ifp;
 1680         struct nd_prefix *opr;
 1681         struct sockaddr_in6 sa6, mask6;
 1682         struct rtentry *rt;
 1683         char ip6buf[INET6_ADDRSTRLEN];
 1684         int fibnum, a_failure;
 1685 
 1686         /* sanity check */
 1687         if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
 1688                 nd6log((LOG_ERR,
 1689                     "nd6_prefix_offlink: %s/%d is already off-link\n",
 1690                     ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
 1691                     pr->ndpr_plen));
 1692                 return (EEXIST);
 1693         }
 1694 
 1695         bzero(&sa6, sizeof(sa6));
 1696         sa6.sin6_family = AF_INET6;
 1697         sa6.sin6_len = sizeof(sa6);
 1698         bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
 1699             sizeof(struct in6_addr));
 1700         bzero(&mask6, sizeof(mask6));
 1701         mask6.sin6_family = AF_INET6;
 1702         mask6.sin6_len = sizeof(sa6);
 1703         bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
 1704 
 1705         a_failure = 0;
 1706         for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
 1707                 rt = NULL;
 1708                 error = in6_rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
 1709                     (struct sockaddr *)&mask6, 0, &rt, fibnum);
 1710                 if (error == 0) {
 1711                         /* report the route deletion to the routing socket. */
 1712                         if (rt != NULL)
 1713                                 nd6_rtmsg(RTM_DELETE, rt);
 1714                 } else {
 1715                         /* Save last error to return, see rtinit(). */
 1716                         a_failure = error;
 1717                 }
 1718                 if (rt != NULL) {
 1719                         RTFREE(rt);
 1720                 }
 1721         }
 1722         error = a_failure;
 1723         a_failure = 1;
 1724         if (error == 0) {
 1725                 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
 1726 
 1727                 /*
 1728                  * There might be the same prefix on another interface,
 1729                  * the prefix which could not be on-link just because we have
 1730                  * the interface route (see comments in nd6_prefix_onlink).
 1731                  * If there's one, try to make the prefix on-link on the
 1732                  * interface.
 1733                  */
 1734                 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) {
 1735                         if (opr == pr)
 1736                                 continue;
 1737 
 1738                         if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
 1739                                 continue;
 1740 
 1741                         /*
 1742                          * KAME specific: detached prefixes should not be
 1743                          * on-link.
 1744                          */
 1745                         if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
 1746                                 continue;
 1747 
 1748                         if (opr->ndpr_plen == pr->ndpr_plen &&
 1749                             in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
 1750                             &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
 1751                                 int e;
 1752 
 1753                                 if ((e = nd6_prefix_onlink(opr)) != 0) {
 1754                                         nd6log((LOG_ERR,
 1755                                             "nd6_prefix_offlink: failed to "
 1756                                             "recover a prefix %s/%d from %s "
 1757                                             "to %s (errno = %d)\n",
 1758                                             ip6_sprintf(ip6buf,
 1759                                                 &opr->ndpr_prefix.sin6_addr),
 1760                                             opr->ndpr_plen, if_name(ifp),
 1761                                             if_name(opr->ndpr_ifp), e));
 1762                                 } else
 1763                                         a_failure = 0;
 1764                         }
 1765                 }
 1766         } else {
 1767                 /* XXX: can we still set the NDPRF_ONLINK flag? */
 1768                 nd6log((LOG_ERR,
 1769                     "nd6_prefix_offlink: failed to delete route: "
 1770                     "%s/%d on %s (errno = %d)\n",
 1771                     ip6_sprintf(ip6buf, &sa6.sin6_addr), pr->ndpr_plen,
 1772                     if_name(ifp), error));
 1773         }
 1774 
 1775         if (a_failure)
 1776                 lltable_prefix_free(AF_INET6, (struct sockaddr *)&sa6,
 1777                     (struct sockaddr *)&mask6, LLE_STATIC);
 1778 
 1779         return (error);
 1780 }
 1781 
 1782 static struct in6_ifaddr *
 1783 in6_ifadd(struct nd_prefixctl *pr, int mcast)
 1784 {
 1785         struct ifnet *ifp = pr->ndpr_ifp;
 1786         struct ifaddr *ifa;
 1787         struct in6_aliasreq ifra;
 1788         struct in6_ifaddr *ia, *ib;
 1789         int error, plen0;
 1790         struct in6_addr mask;
 1791         int prefixlen = pr->ndpr_plen;
 1792         int updateflags;
 1793         char ip6buf[INET6_ADDRSTRLEN];
 1794 
 1795         in6_prefixlen2mask(&mask, prefixlen);
 1796 
 1797         /*
 1798          * find a link-local address (will be interface ID).
 1799          * Is it really mandatory? Theoretically, a global or a site-local
 1800          * address can be configured without a link-local address, if we
 1801          * have a unique interface identifier...
 1802          *
 1803          * it is not mandatory to have a link-local address, we can generate
 1804          * interface identifier on the fly.  we do this because:
 1805          * (1) it should be the easiest way to find interface identifier.
 1806          * (2) RFC2462 5.4 suggesting the use of the same interface identifier
 1807          * for multiple addresses on a single interface, and possible shortcut
 1808          * of DAD.  we omitted DAD for this reason in the past.
 1809          * (3) a user can prevent autoconfiguration of global address
 1810          * by removing link-local address by hand (this is partly because we
 1811          * don't have other way to control the use of IPv6 on an interface.
 1812          * this has been our design choice - cf. NRL's "ifconfig auto").
 1813          * (4) it is easier to manage when an interface has addresses
 1814          * with the same interface identifier, than to have multiple addresses
 1815          * with different interface identifiers.
 1816          */
 1817         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
 1818         if (ifa)
 1819                 ib = (struct in6_ifaddr *)ifa;
 1820         else
 1821                 return NULL;
 1822 
 1823         /* prefixlen + ifidlen must be equal to 128 */
 1824         plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
 1825         if (prefixlen != plen0) {
 1826                 ifa_free(ifa);
 1827                 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
 1828                     "(prefix=%d ifid=%d)\n",
 1829                     if_name(ifp), prefixlen, 128 - plen0));
 1830                 return NULL;
 1831         }
 1832 
 1833         /* make ifaddr */
 1834 
 1835         bzero(&ifra, sizeof(ifra));
 1836         /*
 1837          * in6_update_ifa() does not use ifra_name, but we accurately set it
 1838          * for safety.
 1839          */
 1840         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
 1841         ifra.ifra_addr.sin6_family = AF_INET6;
 1842         ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
 1843         /* prefix */
 1844         ifra.ifra_addr.sin6_addr = pr->ndpr_prefix.sin6_addr;
 1845         ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
 1846         ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
 1847         ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
 1848         ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
 1849 
 1850         /* interface ID */
 1851         ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
 1852             (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
 1853         ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
 1854             (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
 1855         ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
 1856             (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
 1857         ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
 1858             (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
 1859         ifa_free(ifa);
 1860 
 1861         /* new prefix mask. */
 1862         ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
 1863         ifra.ifra_prefixmask.sin6_family = AF_INET6;
 1864         bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
 1865             sizeof(ifra.ifra_prefixmask.sin6_addr));
 1866 
 1867         /* lifetimes. */
 1868         ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
 1869         ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
 1870 
 1871         /* XXX: scope zone ID? */
 1872 
 1873         ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
 1874 
 1875         /*
 1876          * Make sure that we do not have this address already.  This should
 1877          * usually not happen, but we can still see this case, e.g., if we
 1878          * have manually configured the exact address to be configured.
 1879          */
 1880         ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
 1881             &ifra.ifra_addr.sin6_addr);
 1882         if (ifa != NULL) {
 1883                 ifa_free(ifa);
 1884                 /* this should be rare enough to make an explicit log */
 1885                 log(LOG_INFO, "in6_ifadd: %s is already configured\n",
 1886                     ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr));
 1887                 return (NULL);
 1888         }
 1889 
 1890         /*
 1891          * Allocate ifaddr structure, link into chain, etc.
 1892          * If we are going to create a new address upon receiving a multicasted
 1893          * RA, we need to impose a random delay before starting DAD.
 1894          * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2]
 1895          */
 1896         updateflags = 0;
 1897         if (mcast)
 1898                 updateflags |= IN6_IFAUPDATE_DADDELAY;
 1899         if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) {
 1900                 nd6log((LOG_ERR,
 1901                     "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
 1902                     ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr),
 1903                     if_name(ifp), error));
 1904                 return (NULL);  /* ifaddr must not have been allocated. */
 1905         }
 1906 
 1907         ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
 1908         /*
 1909          * XXXRW: Assumption of non-NULLness here might not be true with
 1910          * fine-grained locking -- should we validate it?  Or just return
 1911          * earlier ifa rather than looking it up again?
 1912          */
 1913         return (ia);            /* this is always non-NULL  and referenced. */
 1914 }
 1915 
 1916 /*
 1917  * ia0 - corresponding public address
 1918  */
 1919 int
 1920 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay)
 1921 {
 1922         struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
 1923         struct in6_ifaddr *newia, *ia;
 1924         struct in6_aliasreq ifra;
 1925         int i, error;
 1926         int trylimit = 3;       /* XXX: adhoc value */
 1927         int updateflags;
 1928         u_int32_t randid[2];
 1929         time_t vltime0, pltime0;
 1930 
 1931         bzero(&ifra, sizeof(ifra));
 1932         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
 1933         ifra.ifra_addr = ia0->ia_addr;
 1934         /* copy prefix mask */
 1935         ifra.ifra_prefixmask = ia0->ia_prefixmask;
 1936         /* clear the old IFID */
 1937         for (i = 0; i < 4; i++) {
 1938                 ifra.ifra_addr.sin6_addr.s6_addr32[i] &=
 1939                     ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
 1940         }
 1941 
 1942   again:
 1943         if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
 1944             (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) {
 1945                 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good "
 1946                     "random IFID\n"));
 1947                 return (EINVAL);
 1948         }
 1949         ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
 1950             (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
 1951         ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
 1952             (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
 1953 
 1954         /*
 1955          * in6_get_tmpifid() quite likely provided a unique interface ID.
 1956          * However, we may still have a chance to see collision, because
 1957          * there may be a time lag between generation of the ID and generation
 1958          * of the address.  So, we'll do one more sanity check.
 1959          */
 1960         IN6_IFADDR_RLOCK();
 1961         TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
 1962                 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
 1963                     &ifra.ifra_addr.sin6_addr)) {
 1964                         if (trylimit-- == 0) {
 1965                                 IN6_IFADDR_RUNLOCK();
 1966                                 /*
 1967                                  * Give up.  Something strange should have
 1968                                  * happened.
 1969                                  */
 1970                                 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to "
 1971                                     "find a unique random IFID\n"));
 1972                                 return (EEXIST);
 1973                         }
 1974                         IN6_IFADDR_RUNLOCK();
 1975                         forcegen = 1;
 1976                         goto again;
 1977                 }
 1978         }
 1979         IN6_IFADDR_RUNLOCK();
 1980 
 1981         /*
 1982          * The Valid Lifetime is the lower of the Valid Lifetime of the
 1983          * public address or TEMP_VALID_LIFETIME.
 1984          * The Preferred Lifetime is the lower of the Preferred Lifetime
 1985          * of the public address or TEMP_PREFERRED_LIFETIME -
 1986          * DESYNC_FACTOR.
 1987          */
 1988         if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
 1989                 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
 1990                     (ia0->ia6_lifetime.ia6t_vltime -
 1991                     (time_uptime - ia0->ia6_updatetime));
 1992                 if (vltime0 > V_ip6_temp_valid_lifetime)
 1993                         vltime0 = V_ip6_temp_valid_lifetime;
 1994         } else
 1995                 vltime0 = V_ip6_temp_valid_lifetime;
 1996         if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
 1997                 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
 1998                     (ia0->ia6_lifetime.ia6t_pltime -
 1999                     (time_uptime - ia0->ia6_updatetime));
 2000                 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){
 2001                         pltime0 = V_ip6_temp_preferred_lifetime -
 2002                             V_ip6_desync_factor;
 2003                 }
 2004         } else
 2005                 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor;
 2006         ifra.ifra_lifetime.ia6t_vltime = vltime0;
 2007         ifra.ifra_lifetime.ia6t_pltime = pltime0;
 2008 
 2009         /*
 2010          * A temporary address is created only if this calculated Preferred
 2011          * Lifetime is greater than REGEN_ADVANCE time units.
 2012          */
 2013         if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance)
 2014                 return (0);
 2015 
 2016         /* XXX: scope zone ID? */
 2017 
 2018         ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
 2019 
 2020         /* allocate ifaddr structure, link into chain, etc. */
 2021         updateflags = 0;
 2022         if (delay)
 2023                 updateflags |= IN6_IFAUPDATE_DADDELAY;
 2024         if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0)
 2025                 return (error);
 2026 
 2027         newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
 2028         if (newia == NULL) {    /* XXX: can it happen? */
 2029                 nd6log((LOG_ERR,
 2030                     "in6_tmpifadd: ifa update succeeded, but we got "
 2031                     "no ifaddr\n"));
 2032                 return (EINVAL); /* XXX */
 2033         }
 2034         newia->ia6_ndpr = ia0->ia6_ndpr;
 2035         newia->ia6_ndpr->ndpr_refcnt++;
 2036         ifa_free(&newia->ia_ifa);
 2037 
 2038         /*
 2039          * A newly added address might affect the status of other addresses.
 2040          * XXX: when the temporary address is generated with a new public
 2041          * address, the onlink check is redundant.  However, it would be safe
 2042          * to do the check explicitly everywhere a new address is generated,
 2043          * and, in fact, we surely need the check when we create a new
 2044          * temporary address due to deprecation of an old temporary address.
 2045          */
 2046         pfxlist_onlink_check();
 2047 
 2048         return (0);
 2049 }
 2050 
 2051 static int
 2052 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
 2053 {
 2054         if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
 2055                 ndpr->ndpr_preferred = 0;
 2056         else
 2057                 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime;
 2058         if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
 2059                 ndpr->ndpr_expire = 0;
 2060         else
 2061                 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime;
 2062 
 2063         return 0;
 2064 }
 2065 
 2066 static void
 2067 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
 2068 {
 2069         /* init ia6t_expire */
 2070         if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
 2071                 lt6->ia6t_expire = 0;
 2072         else {
 2073                 lt6->ia6t_expire = time_uptime;
 2074                 lt6->ia6t_expire += lt6->ia6t_vltime;
 2075         }
 2076 
 2077         /* init ia6t_preferred */
 2078         if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
 2079                 lt6->ia6t_preferred = 0;
 2080         else {
 2081                 lt6->ia6t_preferred = time_uptime;
 2082                 lt6->ia6t_preferred += lt6->ia6t_pltime;
 2083         }
 2084 }
 2085 
 2086 /*
 2087  * Delete all the routing table entries that use the specified gateway.
 2088  * XXX: this function causes search through all entries of routing table, so
 2089  * it shouldn't be called when acting as a router.
 2090  */
 2091 void
 2092 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
 2093 {
 2094         struct radix_node_head *rnh;
 2095         u_int fibnum;
 2096 
 2097         /* We'll care only link-local addresses */
 2098         if (!IN6_IS_ADDR_LINKLOCAL(gateway))
 2099                 return;
 2100 
 2101         /* XXX Do we really need to walk any but the default FIB? */
 2102         for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
 2103                 rnh = rt_tables_get_rnh(fibnum, AF_INET6);
 2104                 if (rnh == NULL)
 2105                         continue;
 2106 
 2107                 RADIX_NODE_HEAD_LOCK(rnh);
 2108                 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
 2109                 RADIX_NODE_HEAD_UNLOCK(rnh);
 2110         }
 2111 }
 2112 
 2113 static int
 2114 rt6_deleteroute(struct radix_node *rn, void *arg)
 2115 {
 2116 #define SIN6(s) ((struct sockaddr_in6 *)s)
 2117         struct rtentry *rt = (struct rtentry *)rn;
 2118         struct in6_addr *gate = (struct in6_addr *)arg;
 2119 
 2120         if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
 2121                 return (0);
 2122 
 2123         if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) {
 2124                 return (0);
 2125         }
 2126 
 2127         /*
 2128          * Do not delete a static route.
 2129          * XXX: this seems to be a bit ad-hoc. Should we consider the
 2130          * 'cloned' bit instead?
 2131          */
 2132         if ((rt->rt_flags & RTF_STATIC) != 0)
 2133                 return (0);
 2134 
 2135         /*
 2136          * We delete only host route. This means, in particular, we don't
 2137          * delete default route.
 2138          */
 2139         if ((rt->rt_flags & RTF_HOST) == 0)
 2140                 return (0);
 2141 
 2142         return (in6_rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
 2143             rt_mask(rt), rt->rt_flags, NULL, rt->rt_fibnum));
 2144 #undef SIN6
 2145 }
 2146 
 2147 int
 2148 nd6_setdefaultiface(int ifindex)
 2149 {
 2150         int error = 0;
 2151 
 2152         if (ifindex < 0 || V_if_index < ifindex)
 2153                 return (EINVAL);
 2154         if (ifindex != 0 && !ifnet_byindex(ifindex))
 2155                 return (EINVAL);
 2156 
 2157         if (V_nd6_defifindex != ifindex) {
 2158                 V_nd6_defifindex = ifindex;
 2159                 if (V_nd6_defifindex > 0)
 2160                         V_nd6_defifp = ifnet_byindex(V_nd6_defifindex);
 2161                 else
 2162                         V_nd6_defifp = NULL;
 2163 
 2164                 /*
 2165                  * Our current implementation assumes one-to-one maping between
 2166                  * interfaces and links, so it would be natural to use the
 2167                  * default interface as the default link.
 2168                  */
 2169                 scope6_setdefault(V_nd6_defifp);
 2170         }
 2171 
 2172         return (error);
 2173 }

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