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: stable/4/sys/netinet6/nd6_rtr.c 118830 2003-08-12 16:27:57Z ume $     */
    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         /*
  221          * We only accept RAs only when
  222          * the system-wide variable allows the acceptance, and
  223          * per-interface variable allows RAs on the receiving interface.
  224          */
  225         if (ip6_accept_rtadv == 0)
  226                 goto freeit;
  227         if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
  228                 goto freeit;
  229 
  230         if (ip6->ip6_hlim != 255) {
  231                 nd6log((LOG_ERR,
  232                     "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
  233                     ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
  234                     ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
  235                 goto bad;
  236         }
  237 
  238         if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
  239                 nd6log((LOG_ERR,
  240                     "nd6_ra_input: src %s is not link-local\n",
  241                     ip6_sprintf(&saddr6)));
  242                 goto bad;
  243         }
  244 
  245 #ifndef PULLDOWN_TEST
  246         IP6_EXTHDR_CHECK(m, off, icmp6len,);
  247         nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
  248 #else
  249         IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
  250         if (nd_ra == NULL) {
  251                 icmp6stat.icp6s_tooshort++;
  252                 return;
  253         }
  254 #endif
  255 
  256         icmp6len -= sizeof(*nd_ra);
  257         nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
  258         if (nd6_options(&ndopts) < 0) {
  259                 nd6log((LOG_INFO,
  260                     "nd6_ra_input: invalid ND option, ignored\n"));
  261                 /* nd6_options have incremented stats */
  262                 goto freeit;
  263         }
  264 
  265     {
  266         struct nd_defrouter dr0;
  267         u_int32_t advreachable = nd_ra->nd_ra_reachable;
  268 
  269         dr0.rtaddr = saddr6;
  270         dr0.flags  = nd_ra->nd_ra_flags_reserved;
  271         dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
  272         dr0.expire = time_second + dr0.rtlifetime;
  273         dr0.ifp = ifp;
  274         dr0.advint = 0;         /* Mobile IPv6 */
  275         dr0.advint_expire = 0;  /* Mobile IPv6 */
  276         dr0.advints_lost = 0;   /* Mobile IPv6 */
  277         /* unspecified or not? (RFC 2461 6.3.4) */
  278         if (advreachable) {
  279                 NTOHL(advreachable);
  280                 if (advreachable <= MAX_REACHABLE_TIME &&
  281                     ndi->basereachable != advreachable) {
  282                         ndi->basereachable = advreachable;
  283                         ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
  284                         ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */
  285                 }
  286         }
  287         if (nd_ra->nd_ra_retransmit)
  288                 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
  289         if (nd_ra->nd_ra_curhoplimit)
  290                 ndi->chlim = nd_ra->nd_ra_curhoplimit;
  291         dr = defrtrlist_update(&dr0);
  292     }
  293 
  294         /*
  295          * prefix
  296          */
  297         if (ndopts.nd_opts_pi) {
  298                 struct nd_opt_hdr *pt;
  299                 struct nd_opt_prefix_info *pi = NULL;
  300                 struct nd_prefix pr;
  301 
  302                 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
  303                      pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
  304                      pt = (struct nd_opt_hdr *)((caddr_t)pt +
  305                                                 (pt->nd_opt_len << 3))) {
  306                         if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
  307                                 continue;
  308                         pi = (struct nd_opt_prefix_info *)pt;
  309 
  310                         if (pi->nd_opt_pi_len != 4) {
  311                                 nd6log((LOG_INFO,
  312                                     "nd6_ra_input: invalid option "
  313                                     "len %d for prefix information option, "
  314                                     "ignored\n", pi->nd_opt_pi_len));
  315                                 continue;
  316                         }
  317 
  318                         if (128 < pi->nd_opt_pi_prefix_len) {
  319                                 nd6log((LOG_INFO,
  320                                     "nd6_ra_input: invalid prefix "
  321                                     "len %d for prefix information option, "
  322                                     "ignored\n", pi->nd_opt_pi_prefix_len));
  323                                 continue;
  324                         }
  325 
  326                         if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
  327                          || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
  328                                 nd6log((LOG_INFO,
  329                                     "nd6_ra_input: invalid prefix "
  330                                     "%s, ignored\n",
  331                                     ip6_sprintf(&pi->nd_opt_pi_prefix)));
  332                                 continue;
  333                         }
  334 
  335                         /* aggregatable unicast address, rfc2374 */
  336                         if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20
  337                          && pi->nd_opt_pi_prefix_len != 64) {
  338                                 nd6log((LOG_INFO,
  339                                     "nd6_ra_input: invalid prefixlen "
  340                                     "%d for rfc2374 prefix %s, ignored\n",
  341                                     pi->nd_opt_pi_prefix_len,
  342                                     ip6_sprintf(&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 =
  359                                 ntohl(pi->nd_opt_pi_preferred_time);
  360 
  361                         if (in6_init_prefix_ltimes(&pr))
  362                                 continue; /* prefix lifetime init failed */
  363 
  364                         (void)prelist_update(&pr, dr, m);
  365                 }
  366         }
  367 
  368         /*
  369          * MTU
  370          */
  371         if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
  372                 u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
  373 
  374                 /* lower bound */
  375                 if (mtu < IPV6_MMTU) {
  376                         nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
  377                             "mtu=%d sent from %s, ignoring\n",
  378                             mtu, ip6_sprintf(&ip6->ip6_src)));
  379                         goto skip;
  380                 }
  381 
  382                 /* upper bound */
  383                 if (ndi->maxmtu) {
  384                         if (mtu <= ndi->maxmtu) {
  385                                 int change = (ndi->linkmtu != mtu);
  386 
  387                                 ndi->linkmtu = mtu;
  388                                 if (change) /* in6_maxmtu may change */
  389                                         in6_setmaxmtu();
  390                         } else {
  391                                 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
  392                                     "mtu=%d sent from %s; "
  393                                     "exceeds maxmtu %d, ignoring\n",
  394                                     mtu, ip6_sprintf(&ip6->ip6_src),
  395                                     ndi->maxmtu));
  396                         }
  397                 } else {
  398                         nd6log((LOG_INFO, "nd6_ra_input: mtu option "
  399                             "mtu=%d sent from %s; maxmtu unknown, "
  400                             "ignoring\n",
  401                             mtu, ip6_sprintf(&ip6->ip6_src)));
  402                 }
  403         }
  404 
  405  skip:
  406         
  407         /*
  408          * Source link layer address
  409          */
  410     {
  411         char *lladdr = NULL;
  412         int lladdrlen = 0;
  413         
  414         if (ndopts.nd_opts_src_lladdr) {
  415                 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
  416                 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
  417         }
  418 
  419         if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
  420                 nd6log((LOG_INFO,
  421                     "nd6_ra_input: lladdrlen mismatch for %s "
  422                     "(if %d, RA packet %d)\n",
  423                         ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
  424                 goto bad;
  425         }
  426 
  427         nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0);
  428 
  429         /*
  430          * Installing a link-layer address might change the state of the
  431          * router's neighbor cache, which might also affect our on-link
  432          * detection of adveritsed prefixes.
  433          */
  434         pfxlist_onlink_check();
  435     }
  436 
  437  freeit:
  438         m_freem(m);
  439         return;
  440 
  441  bad:
  442         icmp6stat.icp6s_badra++;
  443         m_freem(m);
  444 }
  445 
  446 /*
  447  * default router list proccessing sub routines
  448  */
  449 
  450 /* tell the change to user processes watching the routing socket. */
  451 static void
  452 nd6_rtmsg(cmd, rt)
  453         int cmd;
  454         struct rtentry *rt;
  455 {
  456         struct rt_addrinfo info;
  457 
  458         bzero((caddr_t)&info, sizeof(info));
  459         info.rti_info[RTAX_DST] = rt_key(rt);
  460         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
  461         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
  462         info.rti_info[RTAX_IFP] =
  463                 (struct sockaddr *)TAILQ_FIRST(&rt->rt_ifp->if_addrlist);
  464         info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
  465 
  466         rt_missmsg(cmd, &info, rt->rt_flags, 0);
  467 }
  468 
  469 void
  470 defrouter_addreq(new)
  471         struct nd_defrouter *new;
  472 {
  473         struct sockaddr_in6 def, mask, gate;
  474         struct rtentry *newrt = NULL;
  475         int s;
  476 
  477         Bzero(&def, sizeof(def));
  478         Bzero(&mask, sizeof(mask));
  479         Bzero(&gate, sizeof(gate));
  480 
  481         def.sin6_len = mask.sin6_len = gate.sin6_len
  482                 = sizeof(struct sockaddr_in6);
  483         def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
  484         gate.sin6_addr = new->rtaddr;
  485 
  486         s = splnet();
  487         (void)rtrequest(RTM_ADD, (struct sockaddr *)&def,
  488                 (struct sockaddr *)&gate, (struct sockaddr *)&mask,
  489                 RTF_GATEWAY, &newrt);
  490         if (newrt) {
  491                 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
  492                 newrt->rt_refcnt--;
  493         }
  494         splx(s);
  495         return;
  496 }
  497 
  498 /* Add a route to a given interface as default */
  499 void
  500 defrouter_addifreq(ifp)
  501         struct ifnet *ifp;
  502 {
  503         struct sockaddr_in6 def, mask;
  504         struct ifaddr *ifa;
  505         struct rtentry *newrt = NULL;
  506         int error, flags;
  507 
  508         bzero(&def, sizeof(def));
  509         bzero(&mask, sizeof(mask));
  510 
  511         def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6);
  512         def.sin6_family = mask.sin6_family = AF_INET6;
  513 
  514         /*
  515          * Search for an ifaddr beloging to the specified interface.
  516          * XXX: An IPv6 address are required to be assigned on the interface.
  517          */
  518         if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) {
  519                 nd6log((LOG_ERR,        /* better error? */
  520                     "defrouter_addifreq: failed to find an ifaddr "
  521                     "to install a route to interface %s\n",
  522                     if_name(ifp)));
  523                 return;
  524         }
  525 
  526         flags = ifa->ifa_flags;
  527         error = rtrequest(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr,
  528                           (struct sockaddr *)&mask, flags, &newrt);
  529         if (error != 0) {
  530                 nd6log((LOG_ERR,
  531                     "defrouter_addifreq: failed to install a route to "
  532                     "interface %s (errno = %d)\n",
  533                     if_name(ifp), error));
  534 
  535                 if (newrt)      /* maybe unnecessary, but do it for safety */
  536                         newrt->rt_refcnt--;
  537         } else {
  538                 if (newrt) {
  539                         nd6_rtmsg(RTM_ADD, newrt);
  540                         newrt->rt_refcnt--;
  541                 }
  542         }
  543 }
  544 
  545 struct nd_defrouter *
  546 defrouter_lookup(addr, ifp)
  547         struct in6_addr *addr;
  548         struct ifnet *ifp;
  549 {
  550         struct nd_defrouter *dr;
  551 
  552         for (dr = TAILQ_FIRST(&nd_defrouter); dr;
  553              dr = TAILQ_NEXT(dr, dr_entry)) {
  554                 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
  555                         return(dr);
  556         }
  557 
  558         return(NULL);           /* search failed */
  559 }
  560 
  561 void
  562 defrouter_delreq(dr, dofree)
  563         struct nd_defrouter *dr;
  564         int dofree;
  565 {
  566         struct sockaddr_in6 def, mask, gate;
  567         struct rtentry *oldrt = NULL;
  568 
  569         Bzero(&def, sizeof(def));
  570         Bzero(&mask, sizeof(mask));
  571         Bzero(&gate, sizeof(gate));
  572 
  573         def.sin6_len = mask.sin6_len = gate.sin6_len
  574                 = sizeof(struct sockaddr_in6);
  575         def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
  576         gate.sin6_addr = dr->rtaddr;
  577 
  578         rtrequest(RTM_DELETE, (struct sockaddr *)&def,
  579                   (struct sockaddr *)&gate,
  580                   (struct sockaddr *)&mask,
  581                   RTF_GATEWAY, &oldrt);
  582         if (oldrt) {
  583                 nd6_rtmsg(RTM_DELETE, oldrt);
  584                 if (oldrt->rt_refcnt <= 0) {
  585                         /*
  586                          * XXX: borrowed from the RTM_DELETE case of
  587                          * rtrequest().
  588                          */
  589                         oldrt->rt_refcnt++;
  590                         rtfree(oldrt);
  591                 }
  592         }
  593 
  594         if (dofree)             /* XXX: necessary? */
  595                 free(dr, M_IP6NDP);
  596 }
  597 
  598 void
  599 defrtrlist_del(dr)
  600         struct nd_defrouter *dr;
  601 {
  602         struct nd_defrouter *deldr = NULL;
  603         struct nd_prefix *pr;
  604 
  605         /*
  606          * Flush all the routing table entries that use the router
  607          * as a next hop.
  608          */
  609         if (!ip6_forwarding && ip6_accept_rtadv) {
  610                 /* above is a good condition? */
  611                 rt6_flush(&dr->rtaddr, dr->ifp);
  612         }
  613 
  614         if (dr == TAILQ_FIRST(&nd_defrouter))
  615                 deldr = dr;     /* The router is primary. */
  616 
  617         TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
  618 
  619         /*
  620          * Also delete all the pointers to the router in each prefix lists.
  621          */
  622         for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
  623                 struct nd_pfxrouter *pfxrtr;
  624                 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
  625                         pfxrtr_del(pfxrtr);
  626         }
  627         pfxlist_onlink_check();
  628 
  629         /*
  630          * If the router is the primary one, choose a new one.
  631          * Note that defrouter_select() will remove the current gateway
  632          * from the routing table.
  633          */
  634         if (deldr)
  635                 defrouter_select();
  636 
  637         free(dr, M_IP6NDP);
  638 }
  639 
  640 /*
  641  * Default Router Selection according to Section 6.3.6 of RFC 2461:
  642  * 1) Routers that are reachable or probably reachable should be
  643  *    preferred.
  644  * 2) When no routers on the list are known to be reachable or
  645  *    probably reachable, routers SHOULD be selected in a round-robin
  646  *    fashion.
  647  * 3) If the Default Router List is empty, assume that all
  648  *    destinations are on-link.
  649  */
  650 void
  651 defrouter_select()
  652 {
  653         int s = splnet();
  654         struct nd_defrouter *dr, anydr;
  655         struct rtentry *rt = NULL;
  656         struct llinfo_nd6 *ln = NULL;
  657 
  658         /*
  659          * Search for a (probably) reachable router from the list.
  660          */
  661         for (dr = TAILQ_FIRST(&nd_defrouter); dr;
  662              dr = TAILQ_NEXT(dr, dr_entry)) {
  663                 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
  664                     (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
  665                     ND6_IS_LLINFO_PROBREACH(ln)) {
  666                         /* Got it, and move it to the head */
  667                         TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
  668                         TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry);
  669                         break;
  670                 }
  671         }
  672 
  673         if ((dr = TAILQ_FIRST(&nd_defrouter))) {
  674                 /*
  675                  * De-install the previous default gateway and install
  676                  * a new one.
  677                  * Note that if there is no reachable router in the list,
  678                  * the head entry will be used anyway.
  679                  * XXX: do we have to check the current routing table entry?
  680                  */
  681                 bzero(&anydr, sizeof(anydr));
  682                 defrouter_delreq(&anydr, 0);
  683                 defrouter_addreq(dr);
  684         }
  685         else {
  686                 /*
  687                  * The Default Router List is empty, so install the default
  688                  * route to an inteface.
  689                  * XXX: The specification does not say this mechanism should
  690                  * be restricted to hosts, but this would be not useful
  691                  * (even harmful) for routers.
  692                  */
  693                 if (!ip6_forwarding) {
  694                         /*
  695                          * De-install the current default route
  696                          * in advance.
  697                          */
  698                         bzero(&anydr, sizeof(anydr));
  699                         defrouter_delreq(&anydr, 0);
  700                         if (nd6_defifp) {
  701                                 /*
  702                                  * Install a route to the default interface
  703                                  * as default route.
  704                                  * XXX: we enable this for host only, because
  705                                  * this may override a default route installed
  706                                  * a user process (e.g. routing daemon) in a
  707                                  * router case.
  708                                  */
  709                                 defrouter_addifreq(nd6_defifp);
  710                         } else {
  711                                 nd6log((LOG_INFO, "defrouter_select: "
  712                                     "there's no default router and no default"
  713                                     " interface\n"));
  714                         }
  715                 }
  716         }
  717 
  718         splx(s);
  719         return;
  720 }
  721 
  722 static struct nd_defrouter *
  723 defrtrlist_update(new)
  724         struct nd_defrouter *new;
  725 {
  726         struct nd_defrouter *dr, *n;
  727         int s = splnet();
  728 
  729         if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
  730                 /* entry exists */
  731                 if (new->rtlifetime == 0) {
  732                         defrtrlist_del(dr);
  733                         dr = NULL;
  734                 } else {
  735                         /* override */
  736                         dr->flags = new->flags; /* xxx flag check */
  737                         dr->rtlifetime = new->rtlifetime;
  738                         dr->expire = new->expire;
  739                 }
  740                 splx(s);
  741                 return(dr);
  742         }
  743 
  744         /* entry does not exist */
  745         if (new->rtlifetime == 0) {
  746                 splx(s);
  747                 return(NULL);
  748         }
  749 
  750         n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
  751         if (n == NULL) {
  752                 splx(s);
  753                 return(NULL);
  754         }
  755         bzero(n, sizeof(*n));
  756         *n = *new;
  757 
  758         /*
  759          * Insert the new router at the end of the Default Router List.
  760          * If there is no other router, install it anyway. Otherwise,
  761          * just continue to use the current default router.
  762          */
  763         TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry);
  764         if (TAILQ_FIRST(&nd_defrouter) == n)
  765                 defrouter_select();
  766         splx(s);
  767                 
  768         return(n);
  769 }
  770 
  771 static struct nd_pfxrouter *
  772 pfxrtr_lookup(pr, dr)
  773         struct nd_prefix *pr;
  774         struct nd_defrouter *dr;
  775 {
  776         struct nd_pfxrouter *search;
  777         
  778         for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
  779                 if (search->router == dr)
  780                         break;
  781         }
  782 
  783         return(search);
  784 }
  785 
  786 static void
  787 pfxrtr_add(pr, dr)
  788         struct nd_prefix *pr;
  789         struct nd_defrouter *dr;
  790 {
  791         struct nd_pfxrouter *new;
  792 
  793         new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
  794         if (new == NULL)
  795                 return;
  796         bzero(new, sizeof(*new));
  797         new->router = dr;
  798 
  799         LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
  800 
  801         pfxlist_onlink_check();
  802 }
  803 
  804 static void
  805 pfxrtr_del(pfr)
  806         struct nd_pfxrouter *pfr;
  807 {
  808         LIST_REMOVE(pfr, pfr_entry);
  809         free(pfr, M_IP6NDP);
  810 }
  811 
  812 struct nd_prefix *
  813 nd6_prefix_lookup(pr)
  814         struct nd_prefix *pr;
  815 {
  816         struct nd_prefix *search;
  817 
  818         for (search = nd_prefix.lh_first; search; search = search->ndpr_next) {
  819                 if (pr->ndpr_ifp == search->ndpr_ifp &&
  820                     pr->ndpr_plen == search->ndpr_plen &&
  821                     in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
  822                                          &search->ndpr_prefix.sin6_addr,
  823                                          pr->ndpr_plen)
  824                     ) {
  825                         break;
  826                 }
  827         }
  828 
  829         return(search);
  830 }
  831 
  832 int
  833 nd6_prelist_add(pr, dr, newp)
  834         struct nd_prefix *pr, **newp;
  835         struct nd_defrouter *dr;
  836 {
  837         struct nd_prefix *new = NULL;
  838         int i, s;
  839 
  840         new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
  841         if (new == NULL)
  842                 return ENOMEM;
  843         bzero(new, sizeof(*new));
  844         *new = *pr;
  845         if (newp != NULL)
  846                 *newp = new;
  847 
  848         /* initilization */
  849         LIST_INIT(&new->ndpr_advrtrs);
  850         in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
  851         /* make prefix in the canonical form */
  852         for (i = 0; i < 4; i++)
  853                 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
  854                         new->ndpr_mask.s6_addr32[i];
  855 
  856         s = splnet();
  857         /* link ndpr_entry to nd_prefix list */
  858         LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry);
  859         splx(s);
  860 
  861         /* ND_OPT_PI_FLAG_ONLINK processing */
  862         if (new->ndpr_raf_onlink) {
  863                 int e;
  864 
  865                 if ((e = nd6_prefix_onlink(new)) != 0) {
  866                         nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
  867                             "the prefix %s/%d on-link on %s (errno=%d)\n",
  868                             ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
  869                             pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  870                         /* proceed anyway. XXX: is it correct? */
  871                 }
  872         }
  873 
  874         if (dr) {
  875                 pfxrtr_add(new, dr);
  876         }
  877 
  878         return 0;
  879 }
  880 
  881 void
  882 prelist_remove(pr)
  883         struct nd_prefix *pr;
  884 {
  885         struct nd_pfxrouter *pfr, *next;
  886         int e, s;
  887 
  888         /* make sure to invalidate the prefix until it is really freed. */
  889         pr->ndpr_vltime = 0;
  890         pr->ndpr_pltime = 0;
  891 #if 0
  892         /*
  893          * Though these flags are now meaningless, we'd rather keep the value
  894          * not to confuse users when executing "ndp -p".
  895          */
  896         pr->ndpr_raf_onlink = 0;
  897         pr->ndpr_raf_auto = 0;
  898 #endif
  899         if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
  900             (e = nd6_prefix_offlink(pr)) != 0) {
  901                 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
  902                     "on %s, errno=%d\n",
  903                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
  904                     pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  905                 /* what should we do? */
  906         }
  907 
  908         if (pr->ndpr_refcnt > 0)
  909                 return;         /* notice here? */
  910 
  911         s = splnet();
  912 
  913         /* unlink ndpr_entry from nd_prefix list */
  914         LIST_REMOVE(pr, ndpr_entry);
  915 
  916         /* free list of routers that adversed the prefix */
  917         for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
  918                 next = pfr->pfr_next;
  919 
  920                 free(pfr, M_IP6NDP);
  921         }
  922         splx(s);
  923 
  924         free(pr, M_IP6NDP);
  925 
  926         pfxlist_onlink_check();
  927 }
  928 
  929 int
  930 prelist_update(new, dr, m)
  931         struct nd_prefix *new;
  932         struct nd_defrouter *dr; /* may be NULL */
  933         struct mbuf *m;
  934 {
  935         struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
  936         struct ifaddr *ifa;
  937         struct ifnet *ifp = new->ndpr_ifp;
  938         struct nd_prefix *pr;
  939         int s = splnet();
  940         int error = 0;
  941         int newprefix = 0;
  942         int auth;
  943         struct in6_addrlifetime lt6_tmp;
  944 
  945         auth = 0;
  946         if (m) {
  947                 /*
  948                  * Authenticity for NA consists authentication for
  949                  * both IP header and IP datagrams, doesn't it ?
  950                  */
  951 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
  952                 auth = (m->m_flags & M_AUTHIPHDR
  953                      && m->m_flags & M_AUTHIPDGM) ? 1 : 0;
  954 #endif
  955         }
  956 
  957 
  958         if ((pr = nd6_prefix_lookup(new)) != NULL) {
  959                 /*
  960                  * nd6_prefix_lookup() ensures that pr and new have the same
  961                  * prefix on a same interface.
  962                  */
  963 
  964                 /*
  965                  * Update prefix information.  Note that the on-link (L) bit
  966                  * and the autonomous (A) bit should NOT be changed from 1
  967                  * to 0.
  968                  */
  969                 if (new->ndpr_raf_onlink == 1)
  970                         pr->ndpr_raf_onlink = 1;
  971                 if (new->ndpr_raf_auto == 1)
  972                         pr->ndpr_raf_auto = 1;
  973                 if (new->ndpr_raf_onlink) {
  974                         pr->ndpr_vltime = new->ndpr_vltime;
  975                         pr->ndpr_pltime = new->ndpr_pltime;
  976                         pr->ndpr_preferred = new->ndpr_preferred;
  977                         pr->ndpr_expire = new->ndpr_expire;
  978                 }
  979 
  980                 if (new->ndpr_raf_onlink &&
  981                     (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
  982                         int e;
  983 
  984                         if ((e = nd6_prefix_onlink(pr)) != 0) {
  985                                 nd6log((LOG_ERR,
  986                                     "prelist_update: failed to make "
  987                                     "the prefix %s/%d on-link on %s "
  988                                     "(errno=%d)\n",
  989                                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
  990                                     pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
  991                                 /* proceed anyway. XXX: is it correct? */
  992                         }
  993                 }
  994 
  995                 if (dr && pfxrtr_lookup(pr, dr) == NULL)
  996                         pfxrtr_add(pr, dr);
  997         } else {
  998                 struct nd_prefix *newpr = NULL;
  999 
 1000                 newprefix = 1;
 1001 
 1002                 if (new->ndpr_vltime == 0)
 1003                         goto end;
 1004                 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
 1005                         goto end;
 1006 
 1007                 bzero(&new->ndpr_addr, sizeof(struct in6_addr));
 1008 
 1009                 error = nd6_prelist_add(new, dr, &newpr);
 1010                 if (error != 0 || newpr == NULL) {
 1011                         nd6log((LOG_NOTICE, "prelist_update: "
 1012                             "nd6_prelist_add failed for %s/%d on %s "
 1013                             "errno=%d, returnpr=%p\n",
 1014                             ip6_sprintf(&new->ndpr_prefix.sin6_addr),
 1015                                         new->ndpr_plen, if_name(new->ndpr_ifp),
 1016                                         error, newpr));
 1017                         goto end; /* we should just give up in this case. */
 1018                 }
 1019 
 1020                 /*
 1021                  * XXX: from the ND point of view, we can ignore a prefix
 1022                  * with the on-link bit being zero.  However, we need a
 1023                  * prefix structure for references from autoconfigured
 1024                  * addresses.  Thus, we explicitly make suret that the prefix
 1025                  * itself expires now.
 1026                  */
 1027                 if (newpr->ndpr_raf_onlink == 0) {
 1028                         newpr->ndpr_vltime = 0;
 1029                         newpr->ndpr_pltime = 0;
 1030                         in6_init_prefix_ltimes(newpr);
 1031                 }
 1032 
 1033                 pr = newpr;
 1034         }
 1035 
 1036         /*
 1037          * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
 1038          * Note that pr must be non NULL at this point.
 1039          */
 1040 
 1041         /* 5.5.3 (a). Ignore the prefix without the A bit set. */
 1042         if (!new->ndpr_raf_auto)
 1043                 goto afteraddrconf;
 1044 
 1045         /*
 1046          * 5.5.3 (b). the link-local prefix should have been ignored in
 1047          * nd6_ra_input.
 1048          */
 1049 
 1050         /*
 1051          * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
 1052          * This should have been done in nd6_ra_input.
 1053          */
 1054 
 1055         /*
 1056          * 5.5.3 (d). If the prefix advertised does not match the prefix of an
 1057          * address already in the list, and the Valid Lifetime is not 0,
 1058          * form an address.  Note that even a manually configured address
 1059          * should reject autoconfiguration of a new address.
 1060          */
 1061         TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
 1062         {
 1063                 struct in6_ifaddr *ifa6;
 1064                 int ifa_plen;
 1065                 u_int32_t storedlifetime;
 1066 
 1067                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1068                         continue;
 1069 
 1070                 ifa6 = (struct in6_ifaddr *)ifa;
 1071 
 1072                 /*
 1073                  * Spec is not clear here, but I believe we should concentrate
 1074                  * on unicast (i.e. not anycast) addresses.
 1075                  * XXX: other ia6_flags? detached or duplicated?
 1076                  */
 1077                 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
 1078                         continue;
 1079                 
 1080                 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL);
 1081                 if (ifa_plen != new->ndpr_plen ||
 1082                     !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr,
 1083                                           &new->ndpr_prefix.sin6_addr,
 1084                                           ifa_plen))
 1085                         continue;
 1086 
 1087                 if (ia6_match == NULL) /* remember the first one */
 1088                         ia6_match = ifa6;
 1089 
 1090                 if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1091                         continue;
 1092 
 1093                 /*
 1094                  * An already autoconfigured address matched.  Now that we
 1095                  * are sure there is at least one matched address, we can
 1096                  * proceed to 5.5.3. (e): update the lifetimes according to the
 1097                  * "two hours" rule and the privacy extension.
 1098                  */
 1099 #define TWOHOUR         (120*60)
 1100                 lt6_tmp = ifa6->ia6_lifetime;
 1101 
 1102                 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
 1103                         storedlifetime = ND6_INFINITE_LIFETIME;
 1104                 else if (IFA6_IS_INVALID(ifa6))
 1105                         storedlifetime = 0;
 1106                 else
 1107                         storedlifetime = lt6_tmp.ia6t_expire - time_second;
 1108 
 1109                 /* when not updating, keep the current stored lifetime. */
 1110                 lt6_tmp.ia6t_vltime = storedlifetime;
 1111 
 1112                 if (TWOHOUR < new->ndpr_vltime ||
 1113                     storedlifetime < new->ndpr_vltime) {
 1114                         lt6_tmp.ia6t_vltime = new->ndpr_vltime;
 1115                 } else if (storedlifetime <= TWOHOUR
 1116 #if 0
 1117                            /*
 1118                             * This condition is logically redundant, so we just
 1119                             * omit it.
 1120                             * See IPng 6712, 6717, and 6721.
 1121                             */
 1122                            && new->ndpr_vltime <= storedlifetime
 1123 #endif
 1124                         ) {
 1125                         if (auth) {
 1126                                 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
 1127                         }
 1128                 } else {
 1129                         /*
 1130                          * new->ndpr_vltime <= TWOHOUR &&
 1131                          * TWOHOUR < storedlifetime
 1132                          */
 1133                         lt6_tmp.ia6t_vltime = TWOHOUR;
 1134                 }
 1135 
 1136                 /* The 2 hour rule is not imposed for preferred lifetime. */
 1137                 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
 1138 
 1139                 in6_init_address_ltimes(pr, &lt6_tmp);
 1140 
 1141                 /*
 1142                  * When adjusting the lifetimes of an existing temporary
 1143                  * address, only lower the lifetimes.
 1144                  * RFC 3041 3.3. (1).
 1145                  * XXX: how should we modify ia6t_[pv]ltime?
 1146                  */
 1147                 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
 1148                         if (lt6_tmp.ia6t_expire == 0 || /* no expire */
 1149                             lt6_tmp.ia6t_expire >
 1150                             ifa6->ia6_lifetime.ia6t_expire) {
 1151                                 lt6_tmp.ia6t_expire =
 1152                                         ifa6->ia6_lifetime.ia6t_expire;
 1153                         }
 1154                         if (lt6_tmp.ia6t_preferred == 0 || /* no expire */
 1155                             lt6_tmp.ia6t_preferred >
 1156                             ifa6->ia6_lifetime.ia6t_preferred) {
 1157                                 lt6_tmp.ia6t_preferred =
 1158                                         ifa6->ia6_lifetime.ia6t_preferred;
 1159                         }
 1160                 }
 1161 
 1162                 ifa6->ia6_lifetime = lt6_tmp;
 1163         }
 1164         if (ia6_match == NULL && new->ndpr_vltime) {
 1165                 /*
 1166                  * No address matched and the valid lifetime is non-zero.
 1167                  * Create a new address.
 1168                  */
 1169                 if ((ia6 = in6_ifadd(new, NULL)) != NULL) {
 1170                         /*
 1171                          * note that we should use pr (not new) for reference.
 1172                          */
 1173                         pr->ndpr_refcnt++;
 1174                         ia6->ia6_ndpr = pr;
 1175 
 1176 #if 0
 1177                         /* XXXYYY Don't do this, according to Jinmei. */
 1178                         pr->ndpr_addr = new->ndpr_addr;
 1179 #endif
 1180 
 1181                         /*
 1182                          * RFC 3041 3.3 (2).
 1183                          * When a new public address is created as described
 1184                          * in RFC2462, also create a new temporary address.
 1185                          *
 1186                          * RFC 3041 3.5.
 1187                          * When an interface connects to a new link, a new
 1188                          * randomized interface identifier should be generated
 1189                          * immediately together with a new set of temporary
 1190                          * addresses.  Thus, we specifiy 1 as the 2nd arg of
 1191                          * in6_tmpifadd().
 1192                          */
 1193                         if (ip6_use_tempaddr) {
 1194                                 int e;
 1195                                 if ((e = in6_tmpifadd(ia6, 1)) != 0) {
 1196                                         nd6log((LOG_NOTICE, "prelist_update: "
 1197                                             "failed to create a temporary "
 1198                                             "address, errno=%d\n",
 1199                                             e));
 1200                                 }
 1201                         }
 1202 
 1203                         /*
 1204                          * A newly added address might affect the status
 1205                          * of other addresses, so we check and update it.
 1206                          * XXX: what if address duplication happens?
 1207                          */
 1208                         pfxlist_onlink_check();
 1209                 } else {
 1210                         /* just set an error. do not bark here. */
 1211                         error = EADDRNOTAVAIL; /* XXX: might be unused. */
 1212                 }
 1213         }
 1214 
 1215   afteraddrconf:
 1216 
 1217  end:
 1218         splx(s);
 1219         return error;
 1220 }
 1221 
 1222 /*
 1223  * A supplement function used in the on-link detection below;
 1224  * detect if a given prefix has a (probably) reachable advertising router.
 1225  * XXX: lengthy function name...
 1226  */
 1227 static struct nd_pfxrouter *
 1228 find_pfxlist_reachable_router(pr)
 1229         struct nd_prefix *pr;
 1230 {
 1231         struct nd_pfxrouter *pfxrtr;
 1232         struct rtentry *rt;
 1233         struct llinfo_nd6 *ln;
 1234 
 1235         for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr;
 1236              pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
 1237                 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0,
 1238                                      pfxrtr->router->ifp)) &&
 1239                     (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
 1240                     ND6_IS_LLINFO_PROBREACH(ln))
 1241                         break;  /* found */
 1242         }
 1243 
 1244         return(pfxrtr);
 1245 
 1246 }
 1247 
 1248 /*
 1249  * Check if each prefix in the prefix list has at least one available router
 1250  * that advertised the prefix (a router is "available" if its neighbor cache
 1251  * entry is reachable or probably reachable).
 1252  * If the check fails, the prefix may be off-link, because, for example,
 1253  * we have moved from the network but the lifetime of the prefix has not
 1254  * expired yet.  So we should not use the prefix if there is another prefix
 1255  * that has an available router.
 1256  * But, if there is no prefix that has an available router, we still regards
 1257  * all the prefixes as on-link.  This is because we can't tell if all the
 1258  * routers are simply dead or if we really moved from the network and there
 1259  * is no router around us.
 1260  */
 1261 void
 1262 pfxlist_onlink_check()
 1263 {
 1264         struct nd_prefix *pr;
 1265         struct in6_ifaddr *ifa;
 1266 
 1267         /*
 1268          * Check if there is a prefix that has a reachable advertising
 1269          * router.
 1270          */
 1271         for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 1272                 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
 1273                         break;
 1274         }
 1275 
 1276         if (pr) {
 1277                 /*
 1278                  * There is at least one prefix that has a reachable router.
 1279                  * Detach prefixes which have no reachable advertising
 1280                  * router, and attach other prefixes.
 1281                  */
 1282                 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 1283                         /* XXX: a link-local prefix should never be detached */
 1284                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1285                                 continue;
 1286 
 1287                         /*
 1288                          * we aren't interested in prefixes without the L bit
 1289                          * set.
 1290                          */
 1291                         if (pr->ndpr_raf_onlink == 0)
 1292                                 continue;
 1293 
 1294                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
 1295                             find_pfxlist_reachable_router(pr) == NULL)
 1296                                 pr->ndpr_stateflags |= NDPRF_DETACHED;
 1297                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
 1298                             find_pfxlist_reachable_router(pr) != 0)
 1299                                 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
 1300                 }
 1301         } else {
 1302                 /* there is no prefix that has a reachable router */
 1303                 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 1304                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1305                                 continue;
 1306 
 1307                         if (pr->ndpr_raf_onlink == 0)
 1308                                 continue;
 1309 
 1310                         if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
 1311                                 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
 1312                 }
 1313         }
 1314 
 1315         /*
 1316          * Remove each interface route associated with a (just) detached
 1317          * prefix, and reinstall the interface route for a (just) attached
 1318          * prefix.  Note that all attempt of reinstallation does not
 1319          * necessarily success, when a same prefix is shared among multiple
 1320          * interfaces.  Such cases will be handled in nd6_prefix_onlink,
 1321          * so we don't have to care about them.
 1322          */
 1323         for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 1324                 int e;
 1325 
 1326                 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1327                         continue;
 1328 
 1329                 if (pr->ndpr_raf_onlink == 0)
 1330                         continue;
 1331 
 1332                 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
 1333                     (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
 1334                         if ((e = nd6_prefix_offlink(pr)) != 0) {
 1335                                 nd6log((LOG_ERR,
 1336                                     "pfxlist_onlink_check: failed to "
 1337                                     "make %s/%d offlink, errno=%d\n",
 1338                                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
 1339                                     pr->ndpr_plen, e));
 1340                         }
 1341                 }
 1342                 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
 1343                     (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
 1344                     pr->ndpr_raf_onlink) {
 1345                         if ((e = nd6_prefix_onlink(pr)) != 0) {
 1346                                 nd6log((LOG_ERR,
 1347                                     "pfxlist_onlink_check: failed to "
 1348                                     "make %s/%d offlink, errno=%d\n",
 1349                                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
 1350                                     pr->ndpr_plen, e));
 1351                         }
 1352                 }
 1353         }
 1354 
 1355         /*
 1356          * Changes on the prefix status might affect address status as well.
 1357          * Make sure that all addresses derived from an attached prefix are
 1358          * attached, and that all addresses derived from a detached prefix are
 1359          * detached.  Note, however, that a manually configured address should
 1360          * always be attached.
 1361          * The precise detection logic is same as the one for prefixes.
 1362          */
 1363         for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
 1364                 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1365                         continue;
 1366 
 1367                 if (ifa->ia6_ndpr == NULL) {
 1368                         /*
 1369                          * This can happen when we first configure the address
 1370                          * (i.e. the address exists, but the prefix does not).
 1371                          * XXX: complicated relationships...
 1372                          */
 1373                         continue;
 1374                 }
 1375 
 1376                 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
 1377                         break;
 1378         }
 1379         if (ifa) {
 1380                 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
 1381                         if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1382                                 continue;
 1383 
 1384                         if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
 1385                                 continue;
 1386 
 1387                         if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
 1388                                 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
 1389                         else
 1390                                 ifa->ia6_flags |= IN6_IFF_DETACHED;
 1391                 }
 1392         }
 1393         else {
 1394                 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
 1395                         if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1396                                 continue;
 1397 
 1398                         ifa->ia6_flags &= ~IN6_IFF_DETACHED;
 1399                 }
 1400         }
 1401 }
 1402 
 1403 int
 1404 nd6_prefix_onlink(pr)
 1405         struct nd_prefix *pr;
 1406 {
 1407         struct ifaddr *ifa;
 1408         struct ifnet *ifp = pr->ndpr_ifp;
 1409         struct sockaddr_in6 mask6;
 1410         struct nd_prefix *opr;
 1411         u_long rtflags;
 1412         int error = 0;
 1413         struct rtentry *rt = NULL;
 1414 
 1415         /* sanity check */
 1416         if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
 1417                 nd6log((LOG_ERR,
 1418                     "nd6_prefix_onlink: %s/%d is already on-link\n",
 1419                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen);
 1420                 return(EEXIST));
 1421         }
 1422 
 1423         /*
 1424          * Add the interface route associated with the prefix.  Before
 1425          * installing the route, check if there's the same prefix on another
 1426          * interface, and the prefix has already installed the interface route.
 1427          * Although such a configuration is expected to be rare, we explicitly
 1428          * allow it.
 1429          */
 1430         for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
 1431                 if (opr == pr)
 1432                         continue;
 1433 
 1434                 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
 1435                         continue;
 1436 
 1437                 if (opr->ndpr_plen == pr->ndpr_plen &&
 1438                     in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
 1439                                          &opr->ndpr_prefix.sin6_addr,
 1440                                          pr->ndpr_plen))
 1441                         return(0);
 1442         }
 1443 
 1444         /*
 1445          * We prefer link-local addresses as the associated interface address. 
 1446          */
 1447         /* search for a link-local addr */
 1448         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
 1449                                                       IN6_IFF_NOTREADY|
 1450                                                       IN6_IFF_ANYCAST);
 1451         if (ifa == NULL) {
 1452                 /* XXX: freebsd does not have ifa_ifwithaf */
 1453                 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
 1454                 {
 1455                         if (ifa->ifa_addr->sa_family == AF_INET6)
 1456                                 break;
 1457                 }
 1458                 /* should we care about ia6_flags? */
 1459         }
 1460         if (ifa == NULL) {
 1461                 /*
 1462                  * This can still happen, when, for example, we receive an RA
 1463                  * containing a prefix with the L bit set and the A bit clear,
 1464                  * after removing all IPv6 addresses on the receiving
 1465                  * interface.  This should, of course, be rare though.
 1466                  */
 1467                 nd6log((LOG_NOTICE,
 1468                     "nd6_prefix_onlink: failed to find any ifaddr"
 1469                     " to add route for a prefix(%s/%d) on %s\n",
 1470                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
 1471                     pr->ndpr_plen, if_name(ifp)));
 1472                 return(0);
 1473         }
 1474 
 1475         /*
 1476          * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
 1477          * ifa->ifa_rtrequest = nd6_rtrequest;
 1478          */
 1479         bzero(&mask6, sizeof(mask6));
 1480         mask6.sin6_len = sizeof(mask6);
 1481         mask6.sin6_addr = pr->ndpr_mask;
 1482         rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP;
 1483         if (nd6_need_cache(ifp)) {
 1484                 /* explicitly set in case ifa_flags does not set the flag. */
 1485                 rtflags |= RTF_CLONING;
 1486         } else {
 1487                 /*
 1488                  * explicitly clear the cloning bit in case ifa_flags sets it.
 1489                  */
 1490                 rtflags &= ~RTF_CLONING;
 1491         }
 1492         error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
 1493                           ifa->ifa_addr, (struct sockaddr *)&mask6,
 1494                           rtflags, &rt);
 1495         if (error == 0) {
 1496                 if (rt != NULL) /* this should be non NULL, though */
 1497                         nd6_rtmsg(RTM_ADD, rt);
 1498                 pr->ndpr_stateflags |= NDPRF_ONLINK;
 1499         }
 1500         else {
 1501                 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
 1502                     " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
 1503                     "errno = %d\n",
 1504                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
 1505                     pr->ndpr_plen, if_name(ifp),
 1506                     ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
 1507                     ip6_sprintf(&mask6.sin6_addr), rtflags, error));
 1508         }
 1509 
 1510         if (rt != NULL)
 1511                 rt->rt_refcnt--;
 1512 
 1513         return(error);
 1514 }
 1515 
 1516 int
 1517 nd6_prefix_offlink(pr)
 1518         struct nd_prefix *pr;
 1519 {
 1520         int error = 0;
 1521         struct ifnet *ifp = pr->ndpr_ifp;
 1522         struct nd_prefix *opr;
 1523         struct sockaddr_in6 sa6, mask6;
 1524         struct rtentry *rt = NULL;
 1525 
 1526         /* sanity check */
 1527         if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
 1528                 nd6log((LOG_ERR,
 1529                     "nd6_prefix_offlink: %s/%d is already off-link\n",
 1530                     ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen));
 1531                 return(EEXIST);
 1532         }
 1533 
 1534         bzero(&sa6, sizeof(sa6));
 1535         sa6.sin6_family = AF_INET6;
 1536         sa6.sin6_len = sizeof(sa6);
 1537         bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
 1538               sizeof(struct in6_addr));
 1539         bzero(&mask6, sizeof(mask6));
 1540         mask6.sin6_family = AF_INET6;
 1541         mask6.sin6_len = sizeof(sa6);
 1542         bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
 1543         error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
 1544                           (struct sockaddr *)&mask6, 0, &rt);
 1545         if (error == 0) {
 1546                 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
 1547 
 1548                 /* report the route deletion to the routing socket. */
 1549                 if (rt != NULL)
 1550                         nd6_rtmsg(RTM_DELETE, rt);
 1551 
 1552                 /*
 1553                  * There might be the same prefix on another interface,
 1554                  * the prefix which could not be on-link just because we have
 1555                  * the interface route (see comments in nd6_prefix_onlink).
 1556                  * If there's one, try to make the prefix on-link on the
 1557                  * interface.
 1558                  */
 1559                 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
 1560                         if (opr == pr)
 1561                                 continue;
 1562 
 1563                         if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
 1564                                 continue;
 1565 
 1566                         /*
 1567                          * KAME specific: detached prefixes should not be
 1568                          * on-link.
 1569                          */
 1570                         if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
 1571                                 continue;
 1572 
 1573                         if (opr->ndpr_plen == pr->ndpr_plen &&
 1574                             in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
 1575                                                  &opr->ndpr_prefix.sin6_addr,
 1576                                                  pr->ndpr_plen)) {
 1577                                 int e;
 1578 
 1579                                 if ((e = nd6_prefix_onlink(opr)) != 0) {
 1580                                         nd6log((LOG_ERR,
 1581                                             "nd6_prefix_offlink: failed to "
 1582                                             "recover a prefix %s/%d from %s "
 1583                                             "to %s (errno = %d)\n",
 1584                                             ip6_sprintf(&opr->ndpr_prefix.sin6_addr),
 1585                                             opr->ndpr_plen, if_name(ifp),
 1586                                             if_name(opr->ndpr_ifp), e));
 1587                                 }
 1588                         }
 1589                 }
 1590         }
 1591         else {
 1592                 /* XXX: can we still set the NDPRF_ONLINK flag? */
 1593                 nd6log((LOG_ERR,
 1594                     "nd6_prefix_offlink: failed to delete route: "
 1595                     "%s/%d on %s (errno = %d)\n",
 1596                     ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp),
 1597                     error));
 1598         }
 1599 
 1600         if (rt != NULL) {
 1601                 if (rt->rt_refcnt <= 0) {
 1602                         /* XXX: we should free the entry ourselves. */
 1603                         rt->rt_refcnt++;
 1604                         rtfree(rt);
 1605                 }
 1606         }
 1607 
 1608         return(error);
 1609 }
 1610 
 1611 static struct in6_ifaddr *
 1612 in6_ifadd(pr, ifid)
 1613         struct nd_prefix *pr;
 1614         struct in6_addr  *ifid;   /* Mobile IPv6 addition */
 1615 {
 1616         struct ifnet *ifp = pr->ndpr_ifp;
 1617         struct ifaddr *ifa;
 1618         struct in6_aliasreq ifra;
 1619         struct in6_ifaddr *ia, *ib;
 1620         int error, plen0;
 1621         struct in6_addr mask;
 1622         int prefixlen = pr->ndpr_plen;
 1623 
 1624         in6_len2mask(&mask, prefixlen);
 1625 
 1626         /*
 1627          * find a link-local address (will be interface ID).
 1628          * Is it really mandatory? Theoretically, a global or a site-local
 1629          * address can be configured without a link-local address, if we
 1630          * have a unique interface identifier...
 1631          *
 1632          * it is not mandatory to have a link-local address, we can generate
 1633          * interface identifier on the fly.  we do this because:
 1634          * (1) it should be the easiest way to find interface identifier.
 1635          * (2) RFC2462 5.4 suggesting the use of the same interface identifier
 1636          * for multiple addresses on a single interface, and possible shortcut
 1637          * of DAD.  we omitted DAD for this reason in the past.
 1638          * (3) a user can prevent autoconfiguration of global address 
 1639          * by removing link-local address by hand (this is partly because we
 1640          * don't have other way to control the use of IPv6 on a interface.
 1641          * this has been our design choice - cf. NRL's "ifconfig auto").
 1642          * (4) it is easier to manage when an interface has addresses
 1643          * with the same interface identifier, than to have multiple addresses
 1644          * with different interface identifiers.
 1645          *
 1646          * Mobile IPv6 addition: allow for caller to specify a wished interface
 1647          * ID. This is to not break connections when moving addresses between
 1648          * interfaces.
 1649          */
 1650         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */
 1651         if (ifa)
 1652                 ib = (struct in6_ifaddr *)ifa;
 1653         else
 1654                 return NULL;
 1655 
 1656 #if 0 /* don't care link local addr state, and always do DAD */
 1657         /* if link-local address is not eligible, do not autoconfigure. */
 1658         if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) {
 1659                 printf("in6_ifadd: link-local address not ready\n");
 1660                 return NULL;
 1661         }
 1662 #endif
 1663 
 1664         /* prefixlen + ifidlen must be equal to 128 */
 1665         plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
 1666         if (prefixlen != plen0) {
 1667                 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
 1668                     "(prefix=%d ifid=%d)\n",
 1669                     if_name(ifp), prefixlen, 128 - plen0));
 1670                 return NULL;
 1671         }
 1672 
 1673         /* make ifaddr */
 1674 
 1675         bzero(&ifra, sizeof(ifra));
 1676         /*
 1677          * in6_update_ifa() does not use ifra_name, but we accurately set it
 1678          * for safety.
 1679          */
 1680         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
 1681         ifra.ifra_addr.sin6_family = AF_INET6;
 1682         ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
 1683         /* prefix */
 1684         bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr,
 1685               sizeof(ifra.ifra_addr.sin6_addr));
 1686         ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
 1687         ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
 1688         ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
 1689         ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
 1690 
 1691         /* interface ID */
 1692         if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid))
 1693                 ifid = &ib->ia_addr.sin6_addr;
 1694         ifra.ifra_addr.sin6_addr.s6_addr32[0]
 1695                 |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]);
 1696         ifra.ifra_addr.sin6_addr.s6_addr32[1]
 1697                 |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]);
 1698         ifra.ifra_addr.sin6_addr.s6_addr32[2]
 1699                 |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]);
 1700         ifra.ifra_addr.sin6_addr.s6_addr32[3]
 1701                 |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]);
 1702             
 1703         /* new prefix mask. */
 1704         ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
 1705         ifra.ifra_prefixmask.sin6_family = AF_INET6;
 1706         bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
 1707               sizeof(ifra.ifra_prefixmask.sin6_addr));
 1708 
 1709         /*
 1710          * lifetime.
 1711          * XXX: in6_init_address_ltimes would override these values later.
 1712          * We should reconsider this logic. 
 1713          */
 1714         ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
 1715         ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
 1716 
 1717         /* XXX: scope zone ID? */
 1718 
 1719         ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
 1720         /*
 1721          * temporarily set the nopfx flag to avoid conflict.
 1722          * XXX: we should reconsider the entire mechanism about prefix
 1723          * manipulation.
 1724          */
 1725         ifra.ifra_flags |= IN6_IFF_NOPFX;
 1726 
 1727         /*
 1728          * keep the new address, regardless of the result of in6_update_ifa.
 1729          * XXX: this address is now meaningless.
 1730          * We should reconsider its role.
 1731          */
 1732         pr->ndpr_addr = ifra.ifra_addr.sin6_addr;
 1733 
 1734         /* allocate ifaddr structure, link into chain, etc. */
 1735         if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
 1736                 nd6log((LOG_ERR,
 1737                     "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
 1738                     ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp),
 1739                     error));
 1740                 return(NULL);   /* ifaddr must not have been allocated. */
 1741         }
 1742 
 1743         ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
 1744 
 1745         return(ia);             /* this must NOT be NULL. */
 1746 }
 1747 
 1748 int
 1749 in6_tmpifadd(ia0, forcegen)
 1750         const struct in6_ifaddr *ia0; /* corresponding public address */
 1751 {
 1752         struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
 1753         struct in6_ifaddr *newia;
 1754         struct in6_aliasreq ifra;
 1755         int i, error;
 1756         int trylimit = 3;       /* XXX: adhoc value */
 1757         u_int32_t randid[2];
 1758         time_t vltime0, pltime0;
 1759 
 1760         bzero(&ifra, sizeof(ifra));
 1761         strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
 1762         ifra.ifra_addr = ia0->ia_addr;
 1763         /* copy prefix mask */
 1764         ifra.ifra_prefixmask = ia0->ia_prefixmask;
 1765         /* clear the old IFID */
 1766         for (i = 0; i < 4; i++) {
 1767                 ifra.ifra_addr.sin6_addr.s6_addr32[i]
 1768                         &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
 1769         }
 1770 
 1771   again:
 1772         in6_get_tmpifid(ifp, (u_int8_t *)randid,
 1773                         (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8],
 1774                         forcegen);
 1775         ifra.ifra_addr.sin6_addr.s6_addr32[2]
 1776                 |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
 1777         ifra.ifra_addr.sin6_addr.s6_addr32[3]
 1778                 |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
 1779 
 1780         /*
 1781          * If by chance the new temporary address is the same as an address
 1782          * already assigned to the interface, generate a new randomized
 1783          * interface identifier and repeat this step.
 1784          * RFC 3041 3.3 (4).
 1785          */
 1786         if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) {
 1787                 if (trylimit-- == 0) {
 1788                         nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find "
 1789                             "a unique random IFID\n"));
 1790                         return(EEXIST);
 1791                 }
 1792                 forcegen = 1;
 1793                 goto again;
 1794         }
 1795 
 1796         /*
 1797          * The Valid Lifetime is the lower of the Valid Lifetime of the
 1798          * public address or TEMP_VALID_LIFETIME.
 1799          * The Preferred Lifetime is the lower of the Preferred Lifetime
 1800          * of the public address or TEMP_PREFERRED_LIFETIME -
 1801          * DESYNC_FACTOR.
 1802          */
 1803         if (ia0->ia6_lifetime.ia6t_expire != 0) {
 1804                 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
 1805                         (ia0->ia6_lifetime.ia6t_expire - time_second);
 1806                 if (vltime0 > ip6_temp_valid_lifetime)
 1807                         vltime0 = ip6_temp_valid_lifetime;
 1808         } else
 1809                 vltime0 = ip6_temp_valid_lifetime;
 1810         if (ia0->ia6_lifetime.ia6t_preferred != 0) {
 1811                 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
 1812                         (ia0->ia6_lifetime.ia6t_preferred - time_second);
 1813                 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor){
 1814                         pltime0 = ip6_temp_preferred_lifetime -
 1815                                 ip6_desync_factor;
 1816                 }
 1817         } else
 1818                 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor;
 1819         ifra.ifra_lifetime.ia6t_vltime = vltime0;
 1820         ifra.ifra_lifetime.ia6t_pltime = pltime0;
 1821 
 1822         /*
 1823          * A temporary address is created only if this calculated Preferred
 1824          * Lifetime is greater than REGEN_ADVANCE time units.
 1825          */
 1826         if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance)
 1827                 return(0);
 1828 
 1829         /* XXX: scope zone ID? */
 1830 
 1831         ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
 1832 
 1833         /* allocate ifaddr structure, link into chain, etc. */
 1834         if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0)
 1835                 return(error);
 1836 
 1837         newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
 1838         if (newia == NULL) {    /* XXX: can it happen? */
 1839                 nd6log((LOG_ERR,
 1840                     "in6_tmpifadd: ifa update succeeded, but we got "
 1841                     "no ifaddr\n"));
 1842                 return(EINVAL); /* XXX */
 1843         }
 1844         newia->ia6_ndpr = ia0->ia6_ndpr;
 1845         newia->ia6_ndpr->ndpr_refcnt++;
 1846 
 1847         return(0);
 1848 }           
 1849 
 1850 int
 1851 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
 1852 {
 1853         /* check if preferred lifetime > valid lifetime.  RFC2462 5.5.3 (c) */
 1854         if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) {
 1855                 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime"
 1856                     "(%d) is greater than valid lifetime(%d)\n",
 1857                     (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime));
 1858                 return (EINVAL);
 1859         }
 1860         if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
 1861                 ndpr->ndpr_preferred = 0;
 1862         else
 1863                 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime;
 1864         if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
 1865                 ndpr->ndpr_expire = 0;
 1866         else
 1867                 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime;
 1868 
 1869         return 0;
 1870 }
 1871 
 1872 static void
 1873 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
 1874 {
 1875         /* init ia6t_expire */
 1876         if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
 1877                 lt6->ia6t_expire = 0;
 1878         else {
 1879                 lt6->ia6t_expire = time_second;
 1880                 lt6->ia6t_expire += lt6->ia6t_vltime;
 1881         }
 1882 
 1883         /* init ia6t_preferred */
 1884         if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
 1885                 lt6->ia6t_preferred = 0;
 1886         else {
 1887                 lt6->ia6t_preferred = time_second;
 1888                 lt6->ia6t_preferred += lt6->ia6t_pltime;
 1889         }
 1890 }
 1891 
 1892 /*
 1893  * Delete all the routing table entries that use the specified gateway.
 1894  * XXX: this function causes search through all entries of routing table, so
 1895  * it shouldn't be called when acting as a router.
 1896  */
 1897 void
 1898 rt6_flush(gateway, ifp)
 1899         struct in6_addr *gateway;
 1900         struct ifnet *ifp;
 1901 {
 1902         struct radix_node_head *rnh = rt_tables[AF_INET6];
 1903         int s = splnet();
 1904 
 1905         /* We'll care only link-local addresses */
 1906         if (!IN6_IS_ADDR_LINKLOCAL(gateway)) {
 1907                 splx(s);
 1908                 return;
 1909         }
 1910         /* XXX: hack for KAME's link-local address kludge */
 1911         gateway->s6_addr16[1] = htons(ifp->if_index);
 1912 
 1913         rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
 1914         splx(s);
 1915 }
 1916 
 1917 static int
 1918 rt6_deleteroute(rn, arg)
 1919         struct radix_node *rn;
 1920         void *arg;
 1921 {
 1922 #define SIN6(s) ((struct sockaddr_in6 *)s)
 1923         struct rtentry *rt = (struct rtentry *)rn;
 1924         struct in6_addr *gate = (struct in6_addr *)arg;
 1925 
 1926         if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
 1927                 return(0);
 1928 
 1929         if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr))
 1930                 return(0);
 1931 
 1932         /*
 1933          * Do not delete a static route.
 1934          * XXX: this seems to be a bit ad-hoc. Should we consider the
 1935          * 'cloned' bit instead?
 1936          */
 1937         if ((rt->rt_flags & RTF_STATIC) != 0)
 1938                 return(0);
 1939 
 1940         /*
 1941          * We delete only host route. This means, in particular, we don't
 1942          * delete default route.
 1943          */
 1944         if ((rt->rt_flags & RTF_HOST) == 0)
 1945                 return(0);
 1946 
 1947         return(rtrequest(RTM_DELETE, rt_key(rt),
 1948                          rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0));
 1949 #undef SIN6
 1950 }
 1951 
 1952 int
 1953 nd6_setdefaultiface(ifindex)
 1954         int ifindex;
 1955 {
 1956         int error = 0;
 1957 
 1958         if (ifindex < 0 || if_index < ifindex)
 1959                 return(EINVAL);
 1960 
 1961         if (nd6_defifindex != ifindex) {
 1962                 nd6_defifindex = ifindex;
 1963                 if (nd6_defifindex > 0)
 1964                         nd6_defifp = ifindex2ifnet[nd6_defifindex];
 1965                 else
 1966                         nd6_defifp = NULL;
 1967 
 1968                 /*
 1969                  * If the Default Router List is empty, install a route
 1970                  * to the specified interface as default or remove the default
 1971                  * route when the default interface becomes canceled.
 1972                  * The check for the queue is actually redundant, but
 1973                  * we do this here to avoid re-install the default route
 1974                  * if the list is NOT empty.
 1975                  */
 1976                 if (TAILQ_FIRST(&nd_defrouter) == NULL)
 1977                         defrouter_select();
 1978 
 1979                 /*
 1980                  * Our current implementation assumes one-to-one maping between
 1981                  * interfaces and links, so it would be natural to use the
 1982                  * default interface as the default link.
 1983                  */
 1984                 scope6_setdefault(nd6_defifp);
 1985         }
 1986 
 1987         return(error);
 1988 }

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