The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/netinet6/nd6_rtr.c

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    1 /*      $FreeBSD: releng/5.0/sys/netinet6/nd6_rtr.c 95023 2002-04-19 04:46:24Z suz $    */
    2 /*      $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $       */
    3 
    4 /*
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 #include "opt_inet.h"
   34 #include "opt_inet6.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/malloc.h>
   39 #include <sys/mbuf.h>
   40 #include <sys/socket.h>
   41 #include <sys/sockio.h>
   42 #include <sys/time.h>
   43 #include <sys/kernel.h>
   44 #include <sys/errno.h>
   45 #include <sys/syslog.h>
   46 #include <sys/queue.h>
   47 
   48 #include <net/if.h>
   49 #include <net/if_types.h>
   50 #include <net/if_dl.h>
   51 #include <net/route.h>
   52 #include <net/radix.h>
   53 
   54 #include <netinet/in.h>
   55 #include <netinet6/in6_var.h>
   56 #include <netinet6/in6_ifattach.h>
   57 #include <netinet/ip6.h>
   58 #include <netinet6/ip6_var.h>
   59 #include <netinet6/nd6.h>
   60 #include <netinet/icmp6.h>
   61 #include <netinet6/scope6_var.h>
   62 
   63 #include <net/net_osdep.h>
   64 
   65 #define SDL(s)  ((struct sockaddr_dl *)s)
   66 
   67 static struct nd_defrouter *defrtrlist_update __P((struct nd_defrouter *));
   68 static struct in6_ifaddr *in6_ifadd __P((struct nd_prefix *,
   69         struct in6_addr *));
   70 static struct nd_pfxrouter *pfxrtr_lookup __P((struct nd_prefix *,
   71         struct nd_defrouter *));
   72 static void pfxrtr_add __P((struct nd_prefix *, struct nd_defrouter *));
   73 static void pfxrtr_del __P((struct nd_pfxrouter *));
   74 static struct nd_pfxrouter *find_pfxlist_reachable_router
   75         __P((struct nd_prefix *));
   76 static void defrouter_addifreq __P((struct ifnet *));
   77 static void nd6_rtmsg __P((int, struct rtentry *));
   78 
   79 static void in6_init_address_ltimes __P((struct nd_prefix *ndpr,
   80                                          struct in6_addrlifetime *lt6));
   81 
   82 static int rt6_deleteroute __P((struct radix_node *, void *));
   83 
   84 extern int nd6_recalc_reachtm_interval;
   85 
   86 static struct ifnet *nd6_defifp;
   87 int nd6_defifindex;
   88 
   89 int ip6_use_tempaddr = 0;
   90 
   91 int ip6_desync_factor;
   92 u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME;
   93 u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME;
   94 /*
   95  * shorter lifetimes for debugging purposes.
   96 int ip6_temp_preferred_lifetime = 800;
   97 static int ip6_temp_valid_lifetime = 1800;
   98 */
   99 int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE;
  100 
  101 /*
  102  * Receive Router Solicitation Message - just for routers.
  103  * Router solicitation/advertisement is mostly managed by userland program
  104  * (rtadvd) so here we have no function like nd6_ra_output().
  105  *
  106  * Based on RFC 2461
  107  */
  108 void
  109 nd6_rs_input(m, off, icmp6len)
  110         struct  mbuf *m;
  111         int off, icmp6len;
  112 {
  113         struct ifnet *ifp = m->m_pkthdr.rcvif;
  114         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  115         struct nd_router_solicit *nd_rs;
  116         struct in6_addr saddr6 = ip6->ip6_src;
  117 #if 0
  118         struct in6_addr daddr6 = ip6->ip6_dst;
  119 #endif
  120         char *lladdr = NULL;
  121         int lladdrlen = 0;
  122 #if 0
  123         struct sockaddr_dl *sdl = (struct sockaddr_dl *)NULL;
  124         struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL;
  125         struct rtentry *rt = NULL;
  126         int is_newentry;
  127 #endif
  128         union nd_opts ndopts;
  129 
  130         /* If I'm not a router, ignore it. */
  131         if (ip6_accept_rtadv != 0 || ip6_forwarding != 1)
  132                 goto freeit;
  133 
  134         /* Sanity checks */
  135         if (ip6->ip6_hlim != 255) {
  136                 nd6log((LOG_ERR,
  137                     "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
  138                     ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
  139                     ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
  140                 goto bad;
  141         }
  142 
  143         /*
  144          * Don't update the neighbor cache, if src = ::.
  145          * This indicates that the src has no IP address assigned yet.
  146          */
  147         if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
  148                 goto freeit;
  149 
  150 #ifndef PULLDOWN_TEST
  151         IP6_EXTHDR_CHECK(m, off, icmp6len,);
  152         nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
  153 #else
  154         IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
  155         if (nd_rs == NULL) {
  156                 icmp6stat.icp6s_tooshort++;
  157                 return;
  158         }
  159 #endif
  160 
  161         icmp6len -= sizeof(*nd_rs);
  162         nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
  163         if (nd6_options(&ndopts) < 0) {
  164                 nd6log((LOG_INFO,
  165                     "nd6_rs_input: invalid ND option, ignored\n"));
  166                 /* nd6_options have incremented stats */
  167                 goto freeit;
  168         }
  169 
  170         if (ndopts.nd_opts_src_lladdr) {
  171                 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
  172                 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
  173         }
  174 
  175         if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
  176                 nd6log((LOG_INFO,
  177                     "nd6_rs_input: lladdrlen mismatch for %s "
  178                     "(if %d, RS packet %d)\n",
  179                         ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
  180                 goto bad;
  181         }
  182 
  183         nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
  184 
  185  freeit:
  186         m_freem(m);
  187         return;
  188 
  189  bad:
  190         icmp6stat.icp6s_badrs++;
  191         m_freem(m);
  192 }
  193 
  194 /*
  195  * Receive Router Advertisement Message.
  196  *
  197  * Based on RFC 2461
  198  * TODO: on-link bit on prefix information
  199  * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
  200  */
  201 void
  202 nd6_ra_input(m, off, icmp6len)
  203         struct  mbuf *m;
  204         int off, icmp6len;
  205 {
  206         struct ifnet *ifp = m->m_pkthdr.rcvif;
  207         struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index];
  208         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
  209         struct nd_router_advert *nd_ra;
  210         struct in6_addr saddr6 = ip6->ip6_src;
  211 #if 0
  212         struct in6_addr daddr6 = ip6->ip6_dst;
  213         int flags; /* = nd_ra->nd_ra_flags_reserved; */
  214         int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0);
  215         int is_other = ((flags & ND_RA_FLAG_OTHER) != 0);
  216 #endif
  217         union nd_opts ndopts;
  218         struct nd_defrouter *dr;
  219 
  220         if (ip6_accept_rtadv == 0)
  221                 goto freeit;
  222 
  223         if (ip6->ip6_hlim != 255) {
  224                 nd6log((LOG_ERR,
  225                     "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
  226                     ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
  227                     ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
  228                 goto bad;
  229         }
  230 
  231         if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
  232                 nd6log((LOG_ERR,
  233                     "nd6_ra_input: src %s is not link-local\n",
  234                     ip6_sprintf(&saddr6)));
  235                 goto bad;
  236         }
  237 
  238 #ifndef PULLDOWN_TEST
  239         IP6_EXTHDR_CHECK(m, off, icmp6len,);
  240         nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
  241 #else
  242         IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
  243         if (nd_ra == NULL) {
  244                 icmp6stat.icp6s_tooshort++;
  245                 return;
  246         }
  247 #endif
  248 
  249         icmp6len -= sizeof(*nd_ra);
  250         nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
  251         if (nd6_options(&ndopts) < 0) {
  252                 nd6log((LOG_INFO,
  253                     "nd6_ra_input: invalid ND option, ignored\n"));
  254                 /* nd6_options have incremented stats */
  255                 goto freeit;
  256         }
  257 
  258     {
  259         struct nd_defrouter dr0;
  260         u_int32_t advreachable = nd_ra->nd_ra_reachable;
  261 
  262         dr0.rtaddr = saddr6;
  263         dr0.flags  = nd_ra->nd_ra_flags_reserved;
  264         dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
  265         dr0.expire = time_second + dr0.rtlifetime;
  266         dr0.ifp = ifp;
  267         dr0.advint = 0;         /* Mobile IPv6 */
  268         dr0.advint_expire = 0;  /* Mobile IPv6 */
  269         dr0.advints_lost = 0;   /* Mobile IPv6 */
  270         /* unspecified or not? (RFC 2461 6.3.4) */
  271         if (advreachable) {
  272                 advreachable = ntohl(advreachable);
  273                 if (advreachable <= MAX_REACHABLE_TIME &&
  274                     ndi->basereachable != advreachable) {
  275                         ndi->basereachable = advreachable;
  276                         ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
  277                         ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */
  278                 }
  279         }
  280         if (nd_ra->nd_ra_retransmit)
  281                 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
  282         if (nd_ra->nd_ra_curhoplimit)
  283                 ndi->chlim = nd_ra->nd_ra_curhoplimit;
  284         dr = defrtrlist_update(&dr0);
  285     }
  286 
  287         /*
  288          * prefix
  289          */
  290         if (ndopts.nd_opts_pi) {
  291                 struct nd_opt_hdr *pt;
  292                 struct nd_opt_prefix_info *pi = NULL;
  293                 struct nd_prefix pr;
  294 
  295                 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
  296                      pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
  297                      pt = (struct nd_opt_hdr *)((caddr_t)pt +
  298                                                 (pt->nd_opt_len << 3))) {
  299                         if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
  300                                 continue;
  301                         pi = (struct nd_opt_prefix_info *)pt;
  302 
  303                         if (pi->nd_opt_pi_len != 4) {
  304                                 nd6log((LOG_INFO,
  305                                     "nd6_ra_input: invalid option "
  306                                     "len %d for prefix information option, "
  307                                     "ignored\n", pi->nd_opt_pi_len));
  308                                 continue;
  309                         }
  310 
  311                         if (128 < pi->nd_opt_pi_prefix_len) {
  312                                 nd6log((LOG_INFO,
  313                                     "nd6_ra_input: invalid prefix "
  314                                     "len %d for prefix information option, "
  315                                     "ignored\n", pi->nd_opt_pi_prefix_len));
  316                                 continue;
  317                         }
  318 
  319                         if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
  320                          || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
  321                                 nd6log((LOG_INFO,
  322                                     "nd6_ra_input: invalid prefix "
  323                                     "%s, ignored\n",
  324                                     ip6_sprintf(&pi->nd_opt_pi_prefix)));
  325                                 continue;
  326                         }
  327 
  328                         /* aggregatable unicast address, rfc2374 */
  329                         if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20
  330                          && pi->nd_opt_pi_prefix_len != 64) {
  331                                 nd6log((LOG_INFO,
  332                                     "nd6_ra_input: invalid prefixlen "
  333                                     "%d for rfc2374 prefix %s, ignored\n",
  334                                     pi->nd_opt_pi_prefix_len,
  335                                     ip6_sprintf(&pi->nd_opt_pi_prefix)));
  336                                 continue;
  337                         }
  338 
  339                         bzero(&pr, sizeof(pr));
  340                         pr.ndpr_prefix.sin6_family = AF_INET6;
  341                         pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
  342                         pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
  343                         pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
  344 
  345                         pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
  346                                               ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
  347                         pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
  348                                             ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
  349                         pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
  350                         pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
  351                         pr.ndpr_pltime =
  352                                 ntohl(pi->nd_opt_pi_preferred_time);
  353 
  354                         if (in6_init_prefix_ltimes(&pr))
  355                                 continue; /* prefix lifetime init failed */
  356 
  357                         (void)prelist_update(&pr, dr, m);
  358                 }
  359         }
  360 
  361         /*
  362          * MTU
  363          */
  364         if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
  365                 u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
  366 
  367                 /* lower bound */
  368                 if (mtu < IPV6_MMTU) {
  369                         nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
  370                             "mtu=%d sent from %s, ignoring\n",
  371                             mtu, ip6_sprintf(&ip6->ip6_src)));
  372                         goto skip;
  373                 }
  374 
  375                 /* upper bound */
  376                 if (ndi->maxmtu) {
  377                         if (mtu <= ndi->maxmtu) {
  378                                 int change = (ndi->linkmtu != mtu);
  379 
  380                                 ndi->linkmtu = mtu;
  381                                 if (change) /* in6_maxmtu may change */
  382                                         in6_setmaxmtu();
  383                         } else {
  384                                 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
  385                                     "mtu=%d sent from %s; "
  386                                     "exceeds maxmtu %d, ignoring\n",
  387                                     mtu, ip6_sprintf(&ip6->ip6_src),
  388                                     ndi->maxmtu));
  389                         }
  390                 } else {
  391                         nd6log((LOG_INFO, "nd6_ra_input: mtu option "
  392                             "mtu=%d sent from %s; maxmtu unknown, "
  393                             "ignoring\n",
  394                             mtu, ip6_sprintf(&ip6->ip6_src)));
  395                 }
  396         }
  397 
  398  skip:
  399         
  400         /*
  401          * Source link layer address
  402          */
  403     {
  404         char *lladdr = NULL;
  405         int lladdrlen = 0;
  406         
  407         if (ndopts.nd_opts_src_lladdr) {
  408                 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
  409                 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
  410         }
  411 
  412         if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
  413                 nd6log((LOG_INFO,
  414                     "nd6_ra_input: lladdrlen mismatch for %s "
  415                     "(if %d, RA packet %d)\n",
  416                         ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
  417                 goto bad;
  418         }
  419 
  420         nd6_cache_lladdr(ifp, &saddr6, lladdr, 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.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(cmd, rt)
  446         int cmd;
  447         struct rtentry *rt;
  448 {
  449         struct rt_addrinfo info;
  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         info.rti_info[RTAX_IFP] =
  456                 (struct sockaddr *)TAILQ_FIRST(&rt->rt_ifp->if_addrlist);
  457         info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
  458 
  459         rt_missmsg(cmd, &info, rt->rt_flags, 0);
  460 }
  461 
  462 void
  463 defrouter_addreq(new)
  464         struct nd_defrouter *new;
  465 {
  466         struct sockaddr_in6 def, mask, gate;
  467         struct rtentry *newrt = NULL;
  468         int s;
  469 
  470         Bzero(&def, sizeof(def));
  471         Bzero(&mask, sizeof(mask));
  472         Bzero(&gate, sizeof(gate));
  473 
  474         def.sin6_len = mask.sin6_len = gate.sin6_len
  475                 = sizeof(struct sockaddr_in6);
  476         def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
  477         gate.sin6_addr = new->rtaddr;
  478 
  479         s = splnet();
  480         (void)rtrequest(RTM_ADD, (struct sockaddr *)&def,
  481                 (struct sockaddr *)&gate, (struct sockaddr *)&mask,
  482                 RTF_GATEWAY, &newrt);
  483         if (newrt) {
  484                 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
  485                 newrt->rt_refcnt--;
  486         }
  487         splx(s);
  488         return;
  489 }
  490 
  491 /* Add a route to a given interface as default */
  492 void
  493 defrouter_addifreq(ifp)
  494         struct ifnet *ifp;
  495 {
  496         struct sockaddr_in6 def, mask;
  497         struct ifaddr *ifa;
  498         struct rtentry *newrt = NULL;
  499         int error, flags;
  500 
  501         bzero(&def, sizeof(def));
  502         bzero(&mask, sizeof(mask));
  503 
  504         def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6);
  505         def.sin6_family = mask.sin6_family = AF_INET6;
  506 
  507         /*
  508          * Search for an ifaddr beloging to the specified interface.
  509          * XXX: An IPv6 address are required to be assigned on the interface.
  510          */
  511         if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) {
  512                 nd6log((LOG_ERR,        /* better error? */
  513                     "defrouter_addifreq: failed to find an ifaddr "
  514                     "to install a route to interface %s\n",
  515                     if_name(ifp)));
  516                 return;
  517         }
  518 
  519         flags = ifa->ifa_flags;
  520         error = rtrequest(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr,
  521                           (struct sockaddr *)&mask, flags, &newrt);
  522         if (error != 0) {
  523                 nd6log((LOG_ERR,
  524                     "defrouter_addifreq: failed to install a route to "
  525                     "interface %s (errno = %d)\n",
  526                     if_name(ifp), error));
  527 
  528                 if (newrt)      /* maybe unnecessary, but do it for safety */
  529                         newrt->rt_refcnt--;
  530         } else {
  531                 if (newrt) {
  532                         nd6_rtmsg(RTM_ADD, newrt);
  533                         newrt->rt_refcnt--;
  534                 }
  535         }
  536 }
  537 
  538 struct nd_defrouter *
  539 defrouter_lookup(addr, ifp)
  540         struct in6_addr *addr;
  541         struct ifnet *ifp;
  542 {
  543         struct nd_defrouter *dr;
  544 
  545         for (dr = TAILQ_FIRST(&nd_defrouter); dr;
  546              dr = TAILQ_NEXT(dr, dr_entry)) {
  547                 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
  548                         return(dr);
  549         }
  550 
  551         return(NULL);           /* search failed */
  552 }
  553 
  554 void
  555 defrouter_delreq(dr, dofree)
  556         struct nd_defrouter *dr;
  557         int dofree;
  558 {
  559         struct sockaddr_in6 def, mask, gate;
  560         struct rtentry *oldrt = NULL;
  561 
  562         Bzero(&def, sizeof(def));
  563         Bzero(&mask, sizeof(mask));
  564         Bzero(&gate, sizeof(gate));
  565 
  566         def.sin6_len = mask.sin6_len = gate.sin6_len
  567                 = sizeof(struct sockaddr_in6);
  568         def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
  569         gate.sin6_addr = dr->rtaddr;
  570 
  571         rtrequest(RTM_DELETE, (struct sockaddr *)&def,
  572                   (struct sockaddr *)&gate,
  573                   (struct sockaddr *)&mask,
  574                   RTF_GATEWAY, &oldrt);
  575         if (oldrt) {
  576                 nd6_rtmsg(RTM_DELETE, oldrt);
  577                 if (oldrt->rt_refcnt <= 0) {
  578                         /*
  579                          * XXX: borrowed from the RTM_DELETE case of
  580                          * rtrequest().
  581                          */
  582                         oldrt->rt_refcnt++;
  583                         rtfree(oldrt);
  584                 }
  585         }
  586 
  587         if (dofree)             /* XXX: necessary? */
  588                 free(dr, M_IP6NDP);
  589 }
  590 
  591 void
  592 defrtrlist_del(dr)
  593         struct nd_defrouter *dr;
  594 {
  595         struct nd_defrouter *deldr = NULL;
  596         struct nd_prefix *pr;
  597 
  598         /*
  599          * Flush all the routing table entries that use the router
  600          * as a next hop.
  601          */
  602         if (!ip6_forwarding && ip6_accept_rtadv) {
  603                 /* above is a good condition? */
  604                 rt6_flush(&dr->rtaddr, dr->ifp);
  605         }
  606 
  607         if (dr == TAILQ_FIRST(&nd_defrouter))
  608                 deldr = dr;     /* The router is primary. */
  609 
  610         TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
  611 
  612         /*
  613          * Also delete all the pointers to the router in each prefix lists.
  614          */
  615         for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
  616                 struct nd_pfxrouter *pfxrtr;
  617                 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
  618                         pfxrtr_del(pfxrtr);
  619         }
  620         pfxlist_onlink_check();
  621 
  622         /*
  623          * If the router is the primary one, choose a new one.
  624          * Note that defrouter_select() will remove the current gateway
  625          * from the routing table.
  626          */
  627         if (deldr)
  628                 defrouter_select();
  629 
  630         free(dr, M_IP6NDP);
  631 }
  632 
  633 /*
  634  * Default Router Selection according to Section 6.3.6 of RFC 2461:
  635  * 1) Routers that are reachable or probably reachable should be
  636  *    preferred.
  637  * 2) When no routers on the list are known to be reachable or
  638  *    probably reachable, routers SHOULD be selected in a round-robin
  639  *    fashion.
  640  * 3) If the Default Router List is empty, assume that all
  641  *    destinations are on-link.
  642  */
  643 void
  644 defrouter_select()
  645 {
  646         int s = splnet();
  647         struct nd_defrouter *dr, anydr;
  648         struct rtentry *rt = NULL;
  649         struct llinfo_nd6 *ln = NULL;
  650 
  651         /*
  652          * Search for a (probably) reachable router from the list.
  653          */
  654         for (dr = TAILQ_FIRST(&nd_defrouter); dr;
  655              dr = TAILQ_NEXT(dr, dr_entry)) {
  656                 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
  657                     (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
  658                     ND6_IS_LLINFO_PROBREACH(ln)) {
  659                         /* Got it, and move it to the head */
  660                         TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
  661                         TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry);
  662                         break;
  663                 }
  664         }
  665 
  666         if ((dr = TAILQ_FIRST(&nd_defrouter))) {
  667                 /*
  668                  * De-install the previous default gateway and install
  669                  * a new one.
  670                  * Note that if there is no reachable router in the list,
  671                  * the head entry will be used anyway.
  672                  * XXX: do we have to check the current routing table entry?
  673                  */
  674                 bzero(&anydr, sizeof(anydr));
  675                 defrouter_delreq(&anydr, 0);
  676                 defrouter_addreq(dr);
  677         }
  678         else {
  679                 /*
  680                  * The Default Router List is empty, so install the default
  681                  * route to an inteface.
  682                  * XXX: The specification does not say this mechanism should
  683                  * be restricted to hosts, but this would be not useful
  684                  * (even harmful) for routers.
  685                  */
  686                 if (!ip6_forwarding) {
  687                         /*
  688                          * De-install the current default route
  689                          * in advance.
  690                          */
  691                         bzero(&anydr, sizeof(anydr));
  692                         defrouter_delreq(&anydr, 0);
  693                         if (nd6_defifp) {
  694                                 /*
  695                                  * Install a route to the default interface
  696                                  * as default route.
  697                                  * XXX: we enable this for host only, because
  698                                  * this may override a default route installed
  699                                  * a user process (e.g. routing daemon) in a
  700                                  * router case.
  701                                  */
  702                                 defrouter_addifreq(nd6_defifp);
  703                         } else {
  704                                 nd6log((LOG_INFO, "defrouter_select: "
  705                                     "there's no default router and no default"
  706                                     " interface\n"));
  707                         }
  708                 }
  709         }
  710 
  711         splx(s);
  712         return;
  713 }
  714 
  715 static struct nd_defrouter *
  716 defrtrlist_update(new)
  717         struct nd_defrouter *new;
  718 {
  719         struct nd_defrouter *dr, *n;
  720         int s = splnet();
  721 
  722         if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
  723                 /* entry exists */
  724                 if (new->rtlifetime == 0) {
  725                         defrtrlist_del(dr);
  726                         dr = NULL;
  727                 } else {
  728                         /* override */
  729                         dr->flags = new->flags; /* xxx flag check */
  730                         dr->rtlifetime = new->rtlifetime;
  731                         dr->expire = new->expire;
  732                 }
  733                 splx(s);
  734                 return(dr);
  735         }
  736 
  737         /* entry does not exist */
  738         if (new->rtlifetime == 0) {
  739                 splx(s);
  740                 return(NULL);
  741         }
  742 
  743         n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
  744         if (n == NULL) {
  745                 splx(s);
  746                 return(NULL);
  747         }
  748         bzero(n, sizeof(*n));
  749         *n = *new;
  750 
  751         /*
  752          * Insert the new router at the end of the Default Router List.
  753          * If there is no other router, install it anyway. Otherwise,
  754          * just continue to use the current default router.
  755          */
  756         TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry);
  757         if (TAILQ_FIRST(&nd_defrouter) == n)
  758                 defrouter_select();
  759         splx(s);
  760                 
  761         return(n);
  762 }
  763 
  764 static struct nd_pfxrouter *
  765 pfxrtr_lookup(pr, dr)
  766         struct nd_prefix *pr;
  767         struct nd_defrouter *dr;
  768 {
  769         struct nd_pfxrouter *search;
  770         
  771         for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
  772                 if (search->router == dr)
  773                         break;
  774         }
  775 
  776         return(search);
  777 }
  778 
  779 static void
  780 pfxrtr_add(pr, dr)
  781         struct nd_prefix *pr;
  782         struct nd_defrouter *dr;
  783 {
  784         struct nd_pfxrouter *new;
  785 
  786         new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
  787         if (new == NULL)
  788                 return;
  789         bzero(new, sizeof(*new));
  790         new->router = dr;
  791 
  792         LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
  793 
  794         pfxlist_onlink_check();
  795 }
  796 
  797 static void
  798 pfxrtr_del(pfr)
  799         struct nd_pfxrouter *pfr;
  800 {
  801         LIST_REMOVE(pfr, pfr_entry);
  802         free(pfr, M_IP6NDP);
  803 }
  804 
  805 struct nd_prefix *
  806 nd6_prefix_lookup(pr)
  807         struct nd_prefix *pr;
  808 {
  809         struct nd_prefix *search;
  810 
  811         for (search = nd_prefix.lh_first; search; search = search->ndpr_next) {
  812                 if (pr->ndpr_ifp == search->ndpr_ifp &&
  813                     pr->ndpr_plen == search->ndpr_plen &&
  814                     in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
  815                                          &search->ndpr_prefix.sin6_addr,
  816                                          pr->ndpr_plen)
  817                     ) {
  818                         break;
  819                 }
  820         }
  821 
  822         return(search);
  823 }
  824 
  825 int
  826 nd6_prelist_add(pr, dr, newp)
  827         struct nd_prefix *pr, **newp;
  828         struct nd_defrouter *dr;
  829 {
  830         struct nd_prefix *new = NULL;
  831         int i, s;
  832 
  833         new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
  834         if (new == NULL)
  835                 return ENOMEM;
  836         bzero(new, sizeof(*new));
  837         *new = *pr;
  838         if (newp != NULL)
  839                 *newp = new;
  840 
  841         /* initilization */
  842         LIST_INIT(&new->ndpr_advrtrs);
  843         in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
  844         /* make prefix in the canonical form */
  845         for (i = 0; i < 4; i++)
  846                 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
  847                         new->ndpr_mask.s6_addr32[i];
  848 
  849         s = splnet();
  850         /* link ndpr_entry to nd_prefix list */
  851         LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry);
  852         splx(s);
  853 
  854         /* ND_OPT_PI_FLAG_ONLINK processing */
  855         if (new->ndpr_raf_onlink) {
  856                 int e;
  857 
  858                 if ((e = nd6_prefix_onlink(new)) != 0) {
  859                         nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
  860                             "the prefix %s/%d on-link on %s (errno=%d)\n",
  861                             ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
  862                             pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  863                         /* proceed anyway. XXX: is it correct? */
  864                 }
  865         }
  866 
  867         if (dr) {
  868                 pfxrtr_add(new, dr);
  869         }
  870 
  871         return 0;
  872 }
  873 
  874 void
  875 prelist_remove(pr)
  876         struct nd_prefix *pr;
  877 {
  878         struct nd_pfxrouter *pfr, *next;
  879         int e, s;
  880 
  881         /* make sure to invalidate the prefix until it is really freed. */
  882         pr->ndpr_vltime = 0;
  883         pr->ndpr_pltime = 0;
  884 #if 0
  885         /*
  886          * Though these flags are now meaningless, we'd rather keep the value
  887          * not to confuse users when executing "ndp -p".
  888          */
  889         pr->ndpr_raf_onlink = 0;
  890         pr->ndpr_raf_auto = 0;
  891 #endif
  892         if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
  893             (e = nd6_prefix_offlink(pr)) != 0) {
  894                 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
  895                     "on %s, errno=%d\n",
  896                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
  897                     pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  898                 /* what should we do? */
  899         }
  900 
  901         if (pr->ndpr_refcnt > 0)
  902                 return;         /* notice here? */
  903 
  904         s = splnet();
  905 
  906         /* unlink ndpr_entry from nd_prefix list */
  907         LIST_REMOVE(pr, ndpr_entry);
  908 
  909         /* free list of routers that adversed the prefix */
  910         for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
  911                 next = pfr->pfr_next;
  912 
  913                 free(pfr, M_IP6NDP);
  914         }
  915         splx(s);
  916 
  917         free(pr, M_IP6NDP);
  918 
  919         pfxlist_onlink_check();
  920 }
  921 
  922 int
  923 prelist_update(new, dr, m)
  924         struct nd_prefix *new;
  925         struct nd_defrouter *dr; /* may be NULL */
  926         struct mbuf *m;
  927 {
  928         struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
  929         struct ifaddr *ifa;
  930         struct ifnet *ifp = new->ndpr_ifp;
  931         struct nd_prefix *pr;
  932         int s = splnet();
  933         int error = 0;
  934         int newprefix = 0;
  935         int auth;
  936         struct in6_addrlifetime lt6_tmp;
  937 
  938         auth = 0;
  939         if (m) {
  940                 /*
  941                  * Authenticity for NA consists authentication for
  942                  * both IP header and IP datagrams, doesn't it ?
  943                  */
  944 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
  945                 auth = (m->m_flags & M_AUTHIPHDR
  946                      && m->m_flags & M_AUTHIPDGM) ? 1 : 0;
  947 #endif
  948         }
  949 
  950 
  951         if ((pr = nd6_prefix_lookup(new)) != NULL) {
  952                 /*
  953                  * nd6_prefix_lookup() ensures that pr and new have the same
  954                  * prefix on a same interface.
  955                  */
  956 
  957                 /*
  958                  * Update prefix information.  Note that the on-link (L) bit
  959                  * and the autonomous (A) bit should NOT be changed from 1
  960                  * to 0.
  961                  */
  962                 if (new->ndpr_raf_onlink == 1)
  963                         pr->ndpr_raf_onlink = 1;
  964                 if (new->ndpr_raf_auto == 1)
  965                         pr->ndpr_raf_auto = 1;
  966                 if (new->ndpr_raf_onlink) {
  967                         pr->ndpr_vltime = new->ndpr_vltime;
  968                         pr->ndpr_pltime = new->ndpr_pltime;
  969                         pr->ndpr_preferred = new->ndpr_preferred;
  970                         pr->ndpr_expire = new->ndpr_expire;
  971                 }
  972 
  973                 if (new->ndpr_raf_onlink &&
  974                     (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
  975                         int e;
  976 
  977                         if ((e = nd6_prefix_onlink(pr)) != 0) {
  978                                 nd6log((LOG_ERR,
  979                                     "prelist_update: failed to make "
  980                                     "the prefix %s/%d on-link on %s "
  981                                     "(errno=%d)\n",
  982                                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
  983                                     pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  984                                 /* proceed anyway. XXX: is it correct? */
  985                         }
  986                 }
  987 
  988                 if (dr && pfxrtr_lookup(pr, dr) == NULL)
  989                         pfxrtr_add(pr, dr);
  990         } else {
  991                 struct nd_prefix *newpr = NULL;
  992 
  993                 newprefix = 1;
  994 
  995                 if (new->ndpr_vltime == 0)
  996                         goto end;
  997                 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
  998                         goto end;
  999 
 1000                 bzero(&new->ndpr_addr, sizeof(struct in6_addr));
 1001 
 1002                 error = nd6_prelist_add(new, dr, &newpr);
 1003                 if (error != 0 || newpr == NULL) {
 1004                         nd6log((LOG_NOTICE, "prelist_update: "
 1005                             "nd6_prelist_add failed for %s/%d on %s "
 1006                             "errno=%d, returnpr=%p\n",
 1007                             ip6_sprintf(&new->ndpr_prefix.sin6_addr),
 1008                                         new->ndpr_plen, if_name(new->ndpr_ifp),
 1009                                         error, newpr));
 1010                         goto end; /* we should just give up in this case. */
 1011                 }
 1012 
 1013                 /*
 1014                  * XXX: from the ND point of view, we can ignore a prefix
 1015                  * with the on-link bit being zero.  However, we need a
 1016                  * prefix structure for references from autoconfigured
 1017                  * addresses.  Thus, we explicitly make suret that the prefix
 1018                  * itself expires now.
 1019                  */
 1020                 if (newpr->ndpr_raf_onlink == 0) {
 1021                         newpr->ndpr_vltime = 0;
 1022                         newpr->ndpr_pltime = 0;
 1023                         in6_init_prefix_ltimes(newpr);
 1024                 }
 1025 
 1026                 pr = newpr;
 1027         }
 1028 
 1029         /*
 1030          * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
 1031          * Note that pr must be non NULL at this point.
 1032          */
 1033 
 1034         /* 5.5.3 (a). Ignore the prefix without the A bit set. */
 1035         if (!new->ndpr_raf_auto)
 1036                 goto afteraddrconf;
 1037 
 1038         /*
 1039          * 5.5.3 (b). the link-local prefix should have been ignored in
 1040          * nd6_ra_input.
 1041          */
 1042 
 1043         /*
 1044          * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
 1045          * This should have been done in nd6_ra_input.
 1046          */
 1047 
 1048         /*
 1049          * 5.5.3 (d). If the prefix advertised does not match the prefix of an
 1050          * address already in the list, and the Valid Lifetime is not 0,
 1051          * form an address.  Note that even a manually configured address
 1052          * should reject autoconfiguration of a new address.
 1053          */
 1054         TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
 1055         {
 1056                 struct in6_ifaddr *ifa6;
 1057                 int ifa_plen;
 1058                 u_int32_t storedlifetime;
 1059 
 1060                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1061                         continue;
 1062 
 1063                 ifa6 = (struct in6_ifaddr *)ifa;
 1064 
 1065                 /*
 1066                  * Spec is not clear here, but I believe we should concentrate
 1067                  * on unicast (i.e. not anycast) addresses.
 1068                  * XXX: other ia6_flags? detached or duplicated?
 1069                  */
 1070                 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
 1071                         continue;
 1072                 
 1073                 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL);
 1074                 if (ifa_plen != new->ndpr_plen ||
 1075                     !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr,
 1076                                           &new->ndpr_prefix.sin6_addr,
 1077                                           ifa_plen))
 1078                         continue;
 1079 
 1080                 if (ia6_match == NULL) /* remember the first one */
 1081                         ia6_match = ifa6;
 1082 
 1083                 if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1084                         continue;
 1085 
 1086                 /*
 1087                  * An already autoconfigured address matched.  Now that we
 1088                  * are sure there is at least one matched address, we can
 1089                  * proceed to 5.5.3. (e): update the lifetimes according to the
 1090                  * "two hours" rule and the privacy extension.
 1091                  */
 1092 #define TWOHOUR         (120*60)
 1093                 lt6_tmp = ifa6->ia6_lifetime;
 1094 
 1095                 storedlifetime = IFA6_IS_INVALID(ifa6) ? 0 :
 1096                         (lt6_tmp.ia6t_expire - time_second);
 1097 
 1098                 if (TWOHOUR < new->ndpr_vltime ||
 1099                     storedlifetime < new->ndpr_vltime) {
 1100                         lt6_tmp.ia6t_vltime = new->ndpr_vltime;
 1101                 } else if (storedlifetime <= TWOHOUR
 1102 #if 0
 1103                            /*
 1104                             * This condition is logically redundant, so we just
 1105                             * omit it.
 1106                             * See IPng 6712, 6717, and 6721.
 1107                             */
 1108                            && new->ndpr_vltime <= storedlifetime
 1109 #endif
 1110                         ) {
 1111                         if (auth) {
 1112                                 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
 1113                         }
 1114                 } else {
 1115                         /*
 1116                          * new->ndpr_vltime <= TWOHOUR &&
 1117                          * TWOHOUR < storedlifetime
 1118                          */
 1119                         lt6_tmp.ia6t_vltime = TWOHOUR;
 1120                 }
 1121 
 1122                 /* The 2 hour rule is not imposed for preferred lifetime. */
 1123                 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
 1124 
 1125                 in6_init_address_ltimes(pr, &lt6_tmp);
 1126 
 1127                 /*
 1128                  * When adjusting the lifetimes of an existing temporary
 1129                  * address, only lower the lifetimes.
 1130                  * RFC 3041 3.3. (1).
 1131                  * XXX: how should we modify ia6t_[pv]ltime?
 1132                  */
 1133                 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
 1134                         if (lt6_tmp.ia6t_expire == 0 || /* no expire */
 1135                             lt6_tmp.ia6t_expire >
 1136                             ifa6->ia6_lifetime.ia6t_expire) {
 1137                                 lt6_tmp.ia6t_expire =
 1138                                         ifa6->ia6_lifetime.ia6t_expire;
 1139                         }
 1140                         if (lt6_tmp.ia6t_preferred == 0 || /* no expire */
 1141                             lt6_tmp.ia6t_preferred >
 1142                             ifa6->ia6_lifetime.ia6t_preferred) {
 1143                                 lt6_tmp.ia6t_preferred =
 1144                                         ifa6->ia6_lifetime.ia6t_preferred;
 1145                         }
 1146                 }
 1147 
 1148                 ifa6->ia6_lifetime = lt6_tmp;
 1149         }
 1150         if (ia6_match == NULL && new->ndpr_vltime) {
 1151                 /*
 1152                  * No address matched and the valid lifetime is non-zero.
 1153                  * Create a new address.
 1154                  */
 1155                 if ((ia6 = in6_ifadd(new, NULL)) != NULL) {
 1156                         /*
 1157                          * note that we should use pr (not new) for reference.
 1158                          */
 1159                         pr->ndpr_refcnt++;
 1160                         ia6->ia6_ndpr = pr;
 1161 
 1162 #if 0
 1163                         /* XXXYYY Don't do this, according to Jinmei. */
 1164                         pr->ndpr_addr = new->ndpr_addr;
 1165 #endif
 1166 
 1167                         /*
 1168                          * RFC 3041 3.3 (2).
 1169                          * When a new public address is created as described
 1170                          * in RFC2462, also create a new temporary address.
 1171                          *
 1172                          * RFC 3041 3.5.
 1173                          * When an interface connects to a new link, a new
 1174                          * randomized interface identifier should be generated
 1175                          * immediately together with a new set of temporary
 1176                          * addresses.  Thus, we specifiy 1 as the 2nd arg of
 1177                          * in6_tmpifadd().
 1178                          */
 1179                         if (ip6_use_tempaddr) {
 1180                                 int e;
 1181                                 if ((e = in6_tmpifadd(ia6, 1)) != 0) {
 1182                                         nd6log((LOG_NOTICE, "prelist_update: "
 1183                                             "failed to create a temporary "
 1184                                             "address, errno=%d\n",
 1185                                             e));
 1186                                 }
 1187                         }
 1188 
 1189                         /*
 1190                          * A newly added address might affect the status
 1191                          * of other addresses, so we check and update it.
 1192                          * XXX: what if address duplication happens?
 1193                          */
 1194                         pfxlist_onlink_check();
 1195                 } else {
 1196                         /* just set an error. do not bark here. */
 1197                         error = EADDRNOTAVAIL; /* XXX: might be unused. */
 1198                 }
 1199         }
 1200 
 1201   afteraddrconf:
 1202 
 1203  end:
 1204         splx(s);
 1205         return error;
 1206 }
 1207 
 1208 /*
 1209  * A supplement function used in the on-link detection below;
 1210  * detect if a given prefix has a (probably) reachable advertising router.
 1211  * XXX: lengthy function name...
 1212  */
 1213 static struct nd_pfxrouter *
 1214 find_pfxlist_reachable_router(pr)
 1215         struct nd_prefix *pr;
 1216 {
 1217         struct nd_pfxrouter *pfxrtr;
 1218         struct rtentry *rt;
 1219         struct llinfo_nd6 *ln;
 1220 
 1221         for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr;
 1222              pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
 1223                 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0,
 1224                                      pfxrtr->router->ifp)) &&
 1225                     (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
 1226                     ND6_IS_LLINFO_PROBREACH(ln))
 1227                         break;  /* found */
 1228         }
 1229 
 1230         return(pfxrtr);
 1231 
 1232 }
 1233 
 1234 /*
 1235  * Check if each prefix in the prefix list has at least one available router
 1236  * that advertised the prefix (a router is "available" if its neighbor cache
 1237  * entry is reachable or probably reachable).
 1238  * If the check fails, the prefix may be off-link, because, for example,
 1239  * we have moved from the network but the lifetime of the prefix has not
 1240  * expired yet.  So we should not use the prefix if there is another prefix
 1241  * that has an available router.
 1242  * But, if there is no prefix that has an available router, we still regards
 1243  * all the prefixes as on-link.  This is because we can't tell if all the
 1244  * routers are simply dead or if we really moved from the network and there
 1245  * is no router around us.
 1246  */
 1247 void
 1248 pfxlist_onlink_check()
 1249 {
 1250         struct nd_prefix *pr;
 1251         struct in6_ifaddr *ifa;
 1252 
 1253         /*
 1254          * Check if there is a prefix that has a reachable advertising
 1255          * router.
 1256          */
 1257         for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 1258                 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
 1259                         break;
 1260         }
 1261 
 1262         if (pr) {
 1263                 /*
 1264                  * There is at least one prefix that has a reachable router.
 1265                  * Detach prefixes which have no reachable advertising
 1266                  * router, and attach other prefixes.
 1267                  */
 1268                 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 1269                         /* XXX: a link-local prefix should never be detached */
 1270                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1271                                 continue;
 1272 
 1273                         /*
 1274                          * we aren't interested in prefixes without the L bit
 1275                          * set.
 1276                          */
 1277                         if (pr->ndpr_raf_onlink == 0)
 1278                                 continue;
 1279 
 1280                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
 1281                             find_pfxlist_reachable_router(pr) == NULL)
 1282                                 pr->ndpr_stateflags |= NDPRF_DETACHED;
 1283                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
 1284                             find_pfxlist_reachable_router(pr) != 0)
 1285                                 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
 1286                 }
 1287         } else {
 1288                 /* there is no prefix that has a reachable router */
 1289                 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 1290                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1291                                 continue;
 1292 
 1293                         if (pr->ndpr_raf_onlink == 0)
 1294                                 continue;
 1295 
 1296                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
 1297                                 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
 1298                 }
 1299         }
 1300 
 1301         /*
 1302          * Remove each interface route associated with a (just) detached
 1303          * prefix, and reinstall the interface route for a (just) attached
 1304          * prefix.  Note that all attempt of reinstallation does not
 1305          * necessarily success, when a same prefix is shared among multiple
 1306          * interfaces.  Such cases will be handled in nd6_prefix_onlink,
 1307          * so we don't have to care about them.
 1308          */
 1309         for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 1310                 int e;
 1311 
 1312                 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1313                         continue;
 1314 
 1315                 if (pr->ndpr_raf_onlink == 0)
 1316                         continue;
 1317 
 1318                 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
 1319                     (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
 1320                         if ((e = nd6_prefix_offlink(pr)) != 0) {
 1321                                 nd6log((LOG_ERR,
 1322                                     "pfxlist_onlink_check: failed to "
 1323                                     "make %s/%d offlink, errno=%d\n",
 1324                                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
 1325                                     pr->ndpr_plen, e));
 1326                         }
 1327                 }
 1328                 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
 1329                     (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
 1330                     pr->ndpr_raf_onlink) {
 1331                         if ((e = nd6_prefix_onlink(pr)) != 0) {
 1332                                 nd6log((LOG_ERR,
 1333                                     "pfxlist_onlink_check: failed to "
 1334                                     "make %s/%d offlink, errno=%d\n",
 1335                                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
 1336                                     pr->ndpr_plen, e));
 1337                         }
 1338                 }
 1339         }
 1340 
 1341         /*
 1342          * Changes on the prefix status might affect address status as well.
 1343          * Make sure that all addresses derived from an attached prefix are
 1344          * attached, and that all addresses derived from a detached prefix are
 1345          * detached.  Note, however, that a manually configured address should
 1346          * always be attached.
 1347          * The precise detection logic is same as the one for prefixes.
 1348          */
 1349         for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
 1350                 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1351                         continue;
 1352 
 1353                 if (ifa->ia6_ndpr == NULL) {
 1354                         /*
 1355                          * This can happen when we first configure the address
 1356                          * (i.e. the address exists, but the prefix does not).
 1357                          * XXX: complicated relationships...
 1358                          */
 1359                         continue;
 1360                 }
 1361 
 1362                 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
 1363                         break;
 1364         }
 1365         if (ifa) {
 1366                 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
 1367                         if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1368                                 continue;
 1369 
 1370                         if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
 1371                                 continue;
 1372 
 1373                         if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
 1374                                 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
 1375                         else
 1376                                 ifa->ia6_flags |= IN6_IFF_DETACHED;
 1377                 }
 1378         }
 1379         else {
 1380                 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
 1381                         if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1382                                 continue;
 1383 
 1384                         ifa->ia6_flags &= ~IN6_IFF_DETACHED;
 1385                 }
 1386         }
 1387 }
 1388 
 1389 int
 1390 nd6_prefix_onlink(pr)
 1391         struct nd_prefix *pr;
 1392 {
 1393         struct ifaddr *ifa;
 1394         struct ifnet *ifp = pr->ndpr_ifp;
 1395         struct sockaddr_in6 mask6;
 1396         struct nd_prefix *opr;
 1397         u_long rtflags;
 1398         int error = 0;
 1399         struct rtentry *rt = NULL;
 1400 
 1401         /* sanity check */
 1402         if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
 1403                 nd6log((LOG_ERR,
 1404                     "nd6_prefix_onlink: %s/%d is already on-link\n",
 1405                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen);
 1406                 return(EEXIST));
 1407         }
 1408 
 1409         /*
 1410          * Add the interface route associated with the prefix.  Before
 1411          * installing the route, check if there's the same prefix on another
 1412          * interface, and the prefix has already installed the interface route.
 1413          * Although such a configuration is expected to be rare, we explicitly
 1414          * allow it.
 1415          */
 1416         for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
 1417                 if (opr == pr)
 1418                         continue;
 1419 
 1420                 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
 1421                         continue;
 1422 
 1423                 if (opr->ndpr_plen == pr->ndpr_plen &&
 1424                     in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
 1425                                          &opr->ndpr_prefix.sin6_addr,
 1426                                          pr->ndpr_plen))
 1427                         return(0);
 1428         }
 1429 
 1430         /*
 1431          * We prefer link-local addresses as the associated interface address. 
 1432          */
 1433         /* search for a link-local addr */
 1434         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
 1435                                                       IN6_IFF_NOTREADY|
 1436                                                       IN6_IFF_ANYCAST);
 1437         if (ifa == NULL) {
 1438                 /* XXX: freebsd does not have ifa_ifwithaf */
 1439                 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
 1440                 {
 1441                         if (ifa->ifa_addr->sa_family == AF_INET6)
 1442                                 break;
 1443                 }
 1444                 /* should we care about ia6_flags? */
 1445         }
 1446         if (ifa == NULL) {
 1447                 /*
 1448                  * This can still happen, when, for example, we receive an RA
 1449                  * containing a prefix with the L bit set and the A bit clear,
 1450                  * after removing all IPv6 addresses on the receiving
 1451                  * interface.  This should, of course, be rare though.
 1452                  */
 1453                 nd6log((LOG_NOTICE,
 1454                     "nd6_prefix_onlink: failed to find any ifaddr"
 1455                     " to add route for a prefix(%s/%d) on %s\n",
 1456                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
 1457                     pr->ndpr_plen, if_name(ifp)));
 1458                 return(0);
 1459         }
 1460 
 1461         /*
 1462          * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
 1463          * ifa->ifa_rtrequest = nd6_rtrequest;
 1464          */
 1465         bzero(&mask6, sizeof(mask6));
 1466         mask6.sin6_len = sizeof(mask6);
 1467         mask6.sin6_addr = pr->ndpr_mask;
 1468         rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP;
 1469         if (nd6_need_cache(ifp)) {
 1470                 /* explicitly set in case ifa_flags does not set the flag. */
 1471                 rtflags |= RTF_CLONING;
 1472         } else {
 1473                 /*
 1474                  * explicitly clear the cloning bit in case ifa_flags sets it.
 1475                  */
 1476                 rtflags &= ~RTF_CLONING;
 1477         }
 1478         error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
 1479                           ifa->ifa_addr, (struct sockaddr *)&mask6,
 1480                           rtflags, &rt);
 1481         if (error == 0) {
 1482                 if (rt != NULL) /* this should be non NULL, though */
 1483                         nd6_rtmsg(RTM_ADD, rt);
 1484                 pr->ndpr_stateflags |= NDPRF_ONLINK;
 1485         }
 1486         else {
 1487                 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
 1488                     " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
 1489                     "errno = %d\n",
 1490                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
 1491                     pr->ndpr_plen, if_name(ifp),
 1492                     ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
 1493                     ip6_sprintf(&mask6.sin6_addr), rtflags, error));
 1494         }
 1495 
 1496         if (rt != NULL)
 1497                 rt->rt_refcnt--;
 1498 
 1499         return(error);
 1500 }
 1501 
 1502 int
 1503 nd6_prefix_offlink(pr)
 1504         struct nd_prefix *pr;
 1505 {
 1506         int error = 0;
 1507         struct ifnet *ifp = pr->ndpr_ifp;
 1508         struct nd_prefix *opr;
 1509         struct sockaddr_in6 sa6, mask6;
 1510         struct rtentry *rt = NULL;
 1511 
 1512         /* sanity check */
 1513         if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
 1514                 nd6log((LOG_ERR,
 1515                     "nd6_prefix_offlink: %s/%d is already off-link\n",
 1516                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen));
 1517                 return(EEXIST);
 1518         }
 1519 
 1520         bzero(&sa6, sizeof(sa6));
 1521         sa6.sin6_family = AF_INET6;
 1522         sa6.sin6_len = sizeof(sa6);
 1523         bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
 1524               sizeof(struct in6_addr));
 1525         bzero(&mask6, sizeof(mask6));
 1526         mask6.sin6_family = AF_INET6;
 1527         mask6.sin6_len = sizeof(sa6);
 1528         bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
 1529         error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
 1530                           (struct sockaddr *)&mask6, 0, &rt);
 1531         if (error == 0) {
 1532                 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
 1533 
 1534                 /* report the route deletion to the routing socket. */
 1535                 if (rt != NULL)
 1536                         nd6_rtmsg(RTM_DELETE, rt);
 1537 
 1538                 /*
 1539                  * There might be the same prefix on another interface,
 1540                  * the prefix which could not be on-link just because we have
 1541                  * the interface route (see comments in nd6_prefix_onlink).
 1542                  * If there's one, try to make the prefix on-link on the
 1543                  * interface.
 1544                  */
 1545                 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
 1546                         if (opr == pr)
 1547                                 continue;
 1548 
 1549                         if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
 1550                                 continue;
 1551 
 1552                         /*
 1553                          * KAME specific: detached prefixes should not be
 1554                          * on-link.
 1555                          */
 1556                         if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
 1557                                 continue;
 1558 
 1559                         if (opr->ndpr_plen == pr->ndpr_plen &&
 1560                             in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
 1561                                                  &opr->ndpr_prefix.sin6_addr,
 1562                                                  pr->ndpr_plen)) {
 1563                                 int e;
 1564 
 1565                                 if ((e = nd6_prefix_onlink(opr)) != 0) {
 1566                                         nd6log((LOG_ERR,
 1567                                             "nd6_prefix_offlink: failed to "
 1568                                             "recover a prefix %s/%d from %s "
 1569                                             "to %s (errno = %d)\n",
 1570                                             ip6_sprintf(&opr->ndpr_prefix.sin6_addr),
 1571                                             opr->ndpr_plen, if_name(ifp),
 1572                                             if_name(opr->ndpr_ifp), e));
 1573                                 }
 1574                         }
 1575                 }
 1576         }
 1577         else {
 1578                 /* XXX: can we still set the NDPRF_ONLINK flag? */
 1579                 nd6log((LOG_ERR,
 1580                     "nd6_prefix_offlink: failed to delete route: "
 1581                     "%s/%d on %s (errno = %d)\n",
 1582                     ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp),
 1583                     error));
 1584         }
 1585 
 1586         if (rt != NULL) {
 1587                 if (rt->rt_refcnt <= 0) {
 1588                         /* XXX: we should free the entry ourselves. */
 1589                         rt->rt_refcnt++;
 1590                         rtfree(rt);
 1591                 }
 1592         }
 1593 
 1594         return(error);
 1595 }
 1596 
 1597 static struct in6_ifaddr *
 1598 in6_ifadd(pr, ifid)
 1599         struct nd_prefix *pr;
 1600         struct in6_addr  *ifid;   /* Mobile IPv6 addition */
 1601 {
 1602         struct ifnet *ifp = pr->ndpr_ifp;
 1603         struct ifaddr *ifa;
 1604         struct in6_aliasreq ifra;
 1605         struct in6_ifaddr *ia, *ib;
 1606         int error, plen0;
 1607         struct in6_addr mask;
 1608         int prefixlen = pr->ndpr_plen;
 1609 
 1610         in6_len2mask(&mask, prefixlen);
 1611 
 1612         /*
 1613          * find a link-local address (will be interface ID).
 1614          * Is it really mandatory? Theoretically, a global or a site-local
 1615          * address can be configured without a link-local address, if we
 1616          * have a unique interface identifier...
 1617          *
 1618          * it is not mandatory to have a link-local address, we can generate
 1619          * interface identifier on the fly.  we do this because:
 1620          * (1) it should be the easiest way to find interface identifier.
 1621          * (2) RFC2462 5.4 suggesting the use of the same interface identifier
 1622          * for multiple addresses on a single interface, and possible shortcut
 1623          * of DAD.  we omitted DAD for this reason in the past.
 1624          * (3) a user can prevent autoconfiguration of global address 
 1625          * by removing link-local address by hand (this is partly because we
 1626          * don't have other way to control the use of IPv6 on a interface.
 1627          * this has been our design choice - cf. NRL's "ifconfig auto").
 1628          * (4) it is easier to manage when an interface has addresses
 1629          * with the same interface identifier, than to have multiple addresses
 1630          * with different interface identifiers.
 1631          *
 1632          * Mobile IPv6 addition: allow for caller to specify a wished interface
 1633          * ID. This is to not break connections when moving addresses between
 1634          * interfaces.
 1635          */
 1636         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */
 1637         if (ifa)
 1638                 ib = (struct in6_ifaddr *)ifa;
 1639         else
 1640                 return NULL;
 1641 
 1642 #if 0 /* don't care link local addr state, and always do DAD */
 1643         /* if link-local address is not eligible, do not autoconfigure. */
 1644         if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) {
 1645                 printf("in6_ifadd: link-local address not ready\n");
 1646                 return NULL;
 1647         }
 1648 #endif
 1649 
 1650         /* prefixlen + ifidlen must be equal to 128 */
 1651         plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
 1652         if (prefixlen != plen0) {
 1653                 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
 1654                     "(prefix=%d ifid=%d)\n",
 1655                     if_name(ifp), prefixlen, 128 - plen0));
 1656                 return NULL;
 1657         }
 1658 
 1659         /* make ifaddr */
 1660 
 1661         bzero(&ifra, sizeof(ifra));
 1662         /*
 1663          * in6_update_ifa() does not use ifra_name, but we accurately set it
 1664          * for safety.
 1665          */
 1666         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
 1667         ifra.ifra_addr.sin6_family = AF_INET6;
 1668         ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
 1669         /* prefix */
 1670         bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr,
 1671               sizeof(ifra.ifra_addr.sin6_addr));
 1672         ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
 1673         ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
 1674         ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
 1675         ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
 1676 
 1677         /* interface ID */
 1678         if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid))
 1679                 ifid = &ib->ia_addr.sin6_addr;
 1680         ifra.ifra_addr.sin6_addr.s6_addr32[0]
 1681                 |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]);
 1682         ifra.ifra_addr.sin6_addr.s6_addr32[1]
 1683                 |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]);
 1684         ifra.ifra_addr.sin6_addr.s6_addr32[2]
 1685                 |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]);
 1686         ifra.ifra_addr.sin6_addr.s6_addr32[3]
 1687                 |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]);
 1688             
 1689         /* new prefix mask. */
 1690         ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
 1691         ifra.ifra_prefixmask.sin6_family = AF_INET6;
 1692         bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
 1693               sizeof(ifra.ifra_prefixmask.sin6_addr));
 1694 
 1695         /*
 1696          * lifetime.
 1697          * XXX: in6_init_address_ltimes would override these values later.
 1698          * We should reconsider this logic. 
 1699          */
 1700         ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
 1701         ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
 1702 
 1703         /* XXX: scope zone ID? */
 1704 
 1705         ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
 1706         /*
 1707          * temporarily set the nopfx flag to avoid conflict.
 1708          * XXX: we should reconsider the entire mechanism about prefix
 1709          * manipulation.
 1710          */
 1711         ifra.ifra_flags |= IN6_IFF_NOPFX;
 1712 
 1713         /*
 1714          * keep the new address, regardless of the result of in6_update_ifa.
 1715          * XXX: this address is now meaningless.
 1716          * We should reconsider its role.
 1717          */
 1718         pr->ndpr_addr = ifra.ifra_addr.sin6_addr;
 1719 
 1720         /* allocate ifaddr structure, link into chain, etc. */
 1721         if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
 1722                 nd6log((LOG_ERR,
 1723                     "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
 1724                     ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp),
 1725                     error));
 1726                 return(NULL);   /* ifaddr must not have been allocated. */
 1727         }
 1728 
 1729         ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
 1730 
 1731         return(ia);             /* this must NOT be NULL. */
 1732 }
 1733 
 1734 int
 1735 in6_tmpifadd(ia0, forcegen)
 1736         const struct in6_ifaddr *ia0; /* corresponding public address */
 1737         int forcegen;
 1738 {
 1739         struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
 1740         struct in6_ifaddr *newia;
 1741         struct in6_aliasreq ifra;
 1742         int i, error;
 1743         int trylimit = 3;       /* XXX: adhoc value */
 1744         u_int32_t randid[2];
 1745         time_t vltime0, pltime0;
 1746 
 1747         bzero(&ifra, sizeof(ifra));
 1748         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
 1749         ifra.ifra_addr = ia0->ia_addr;
 1750         /* copy prefix mask */
 1751         ifra.ifra_prefixmask = ia0->ia_prefixmask;
 1752         /* clear the old IFID */
 1753         for (i = 0; i < 4; i++) {
 1754                 ifra.ifra_addr.sin6_addr.s6_addr32[i]
 1755                         &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
 1756         }
 1757 
 1758   again:
 1759         in6_get_tmpifid(ifp, (u_int8_t *)randid,
 1760                         (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8],
 1761                         forcegen);
 1762         ifra.ifra_addr.sin6_addr.s6_addr32[2]
 1763                 |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
 1764         ifra.ifra_addr.sin6_addr.s6_addr32[3]
 1765                 |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
 1766 
 1767         /*
 1768          * If by chance the new temporary address is the same as an address
 1769          * already assigned to the interface, generate a new randomized
 1770          * interface identifier and repeat this step.
 1771          * RFC 3041 3.3 (4).
 1772          */
 1773         if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) {
 1774                 if (trylimit-- == 0) {
 1775                         nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find "
 1776                             "a unique random IFID\n"));
 1777                         return(EEXIST);
 1778                 }
 1779                 forcegen = 1;
 1780                 goto again;
 1781         }
 1782 
 1783         /*
 1784          * The Valid Lifetime is the lower of the Valid Lifetime of the
 1785          * public address or TEMP_VALID_LIFETIME.
 1786          * The Preferred Lifetime is the lower of the Preferred Lifetime
 1787          * of the public address or TEMP_PREFERRED_LIFETIME -
 1788          * DESYNC_FACTOR.
 1789          */
 1790         if (ia0->ia6_lifetime.ia6t_expire != 0) {
 1791                 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
 1792                         (ia0->ia6_lifetime.ia6t_expire - time_second);
 1793                 if (vltime0 > ip6_temp_valid_lifetime)
 1794                         vltime0 = ip6_temp_valid_lifetime;
 1795         } else
 1796                 vltime0 = ip6_temp_valid_lifetime;
 1797         if (ia0->ia6_lifetime.ia6t_preferred != 0) {
 1798                 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
 1799                         (ia0->ia6_lifetime.ia6t_preferred - time_second);
 1800                 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor){
 1801                         pltime0 = ip6_temp_preferred_lifetime -
 1802                                 ip6_desync_factor;
 1803                 }
 1804         } else
 1805                 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor;
 1806         ifra.ifra_lifetime.ia6t_vltime = vltime0;
 1807         ifra.ifra_lifetime.ia6t_pltime = pltime0;
 1808 
 1809         /*
 1810          * A temporary address is created only if this calculated Preferred
 1811          * Lifetime is greater than REGEN_ADVANCE time units.
 1812          */
 1813         if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance)
 1814                 return(0);
 1815 
 1816         /* XXX: scope zone ID? */
 1817 
 1818         ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
 1819 
 1820         /* allocate ifaddr structure, link into chain, etc. */
 1821         if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0)
 1822                 return(error);
 1823 
 1824         newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
 1825         if (newia == NULL) {    /* XXX: can it happen? */
 1826                 nd6log((LOG_ERR,
 1827                     "in6_tmpifadd: ifa update succeeded, but we got "
 1828                     "no ifaddr\n"));
 1829                 return(EINVAL); /* XXX */
 1830         }
 1831         newia->ia6_ndpr = ia0->ia6_ndpr;
 1832         newia->ia6_ndpr->ndpr_refcnt++;
 1833 
 1834         /*
 1835          * A newly added address might affect the status of other addresses.
 1836          * XXX: when the temporary address is generated with a new public
 1837          * address, the onlink check is redundant.  However, it would be safe
 1838          * to do the check explicitly everywhere a new address is generated,
 1839          * and, in fact, we surely need the check when we create a new
 1840          * temporary address due to deprecation of an old temporary address.
 1841          */
 1842         pfxlist_onlink_check();
 1843 
 1844         return(0);
 1845 }           
 1846 
 1847 int
 1848 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
 1849 {
 1850         /* check if preferred lifetime > valid lifetime.  RFC2462 5.5.3 (c) */
 1851         if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) {
 1852                 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime"
 1853                     "(%d) is greater than valid lifetime(%d)\n",
 1854                     (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime));
 1855                 return (EINVAL);
 1856         }
 1857         if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
 1858                 ndpr->ndpr_preferred = 0;
 1859         else
 1860                 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime;
 1861         if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
 1862                 ndpr->ndpr_expire = 0;
 1863         else
 1864                 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime;
 1865 
 1866         return 0;
 1867 }
 1868 
 1869 static void
 1870 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
 1871 {
 1872         /* Valid lifetime must not be updated unless explicitly specified. */
 1873         /* init ia6t_expire */
 1874         if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
 1875                 lt6->ia6t_expire = 0;
 1876         else {
 1877                 lt6->ia6t_expire = time_second;
 1878                 lt6->ia6t_expire += lt6->ia6t_vltime;
 1879         }
 1880 
 1881         /* init ia6t_preferred */
 1882         if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
 1883                 lt6->ia6t_preferred = 0;
 1884         else {
 1885                 lt6->ia6t_preferred = time_second;
 1886                 lt6->ia6t_preferred += lt6->ia6t_pltime;
 1887         }
 1888 }
 1889 
 1890 /*
 1891  * Delete all the routing table entries that use the specified gateway.
 1892  * XXX: this function causes search through all entries of routing table, so
 1893  * it shouldn't be called when acting as a router.
 1894  */
 1895 void
 1896 rt6_flush(gateway, ifp)
 1897         struct in6_addr *gateway;
 1898         struct ifnet *ifp;
 1899 {
 1900         struct radix_node_head *rnh = rt_tables[AF_INET6];
 1901         int s = splnet();
 1902 
 1903         /* We'll care only link-local addresses */
 1904         if (!IN6_IS_ADDR_LINKLOCAL(gateway)) {
 1905                 splx(s);
 1906                 return;
 1907         }
 1908         /* XXX: hack for KAME's link-local address kludge */
 1909         gateway->s6_addr16[1] = htons(ifp->if_index);
 1910 
 1911         rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
 1912         splx(s);
 1913 }
 1914 
 1915 static int
 1916 rt6_deleteroute(rn, arg)
 1917         struct radix_node *rn;
 1918         void *arg;
 1919 {
 1920 #define SIN6(s) ((struct sockaddr_in6 *)s)
 1921         struct rtentry *rt = (struct rtentry *)rn;
 1922         struct in6_addr *gate = (struct in6_addr *)arg;
 1923 
 1924         if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
 1925                 return(0);
 1926 
 1927         if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr))
 1928                 return(0);
 1929 
 1930         /*
 1931          * Do not delete a static route.
 1932          * XXX: this seems to be a bit ad-hoc. Should we consider the
 1933          * 'cloned' bit instead?
 1934          */
 1935         if ((rt->rt_flags & RTF_STATIC) != 0)
 1936                 return(0);
 1937 
 1938         /*
 1939          * We delete only host route. This means, in particular, we don't
 1940          * delete default route.
 1941          */
 1942         if ((rt->rt_flags & RTF_HOST) == 0)
 1943                 return(0);
 1944 
 1945         return(rtrequest(RTM_DELETE, rt_key(rt),
 1946                          rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0));
 1947 #undef SIN6
 1948 }
 1949 
 1950 int
 1951 nd6_setdefaultiface(ifindex)
 1952         int ifindex;
 1953 {
 1954         int error = 0;
 1955 
 1956         if (ifindex < 0 || if_index < ifindex)
 1957                 return(EINVAL);
 1958 
 1959         if (nd6_defifindex != ifindex) {
 1960                 nd6_defifindex = ifindex;
 1961                 if (nd6_defifindex > 0)
 1962                         nd6_defifp = ifnet_byindex(nd6_defifindex);
 1963                 else
 1964                         nd6_defifp = NULL;
 1965 
 1966                 /*
 1967                  * If the Default Router List is empty, install a route
 1968                  * to the specified interface as default or remove the default
 1969                  * route when the default interface becomes canceled.
 1970                  * The check for the queue is actually redundant, but
 1971                  * we do this here to avoid re-install the default route
 1972                  * if the list is NOT empty.
 1973                  */
 1974                 if (TAILQ_FIRST(&nd_defrouter) == NULL)
 1975                         defrouter_select();
 1976 
 1977                 /*
 1978                  * Our current implementation assumes one-to-one maping between
 1979                  * interfaces and links, so it would be natural to use the
 1980                  * default interface as the default link.
 1981                  */
 1982                 scope6_setdefault(nd6_defifp);
 1983         }
 1984 
 1985         return(error);
 1986 }

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