The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/netinet6/nd6.c

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    1 /*      $FreeBSD: src/sys/netinet6/nd6.c,v 1.2.2.15 2003/05/06 06:46:58 suz Exp $       */
    2 /*      $KAME: nd6.c,v 1.144 2001/05/24 07:44:00 itojun 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 /*
   34  * XXX
   35  * KAME 970409 note:
   36  * BSD/OS version heavily modifies this code, related to llinfo.
   37  * Since we don't have BSD/OS version of net/route.c in our hand,
   38  * I left the code mostly as it was in 970310.  -- itojun
   39  */
   40 
   41 #include "opt_inet.h"
   42 #include "opt_inet6.h"
   43 
   44 #include <sys/param.h>
   45 #include <sys/systm.h>
   46 #include <sys/callout.h>
   47 #include <sys/malloc.h>
   48 #include <sys/mbuf.h>
   49 #include <sys/socket.h>
   50 #include <sys/sockio.h>
   51 #include <sys/time.h>
   52 #include <sys/kernel.h>
   53 #include <sys/protosw.h>
   54 #include <sys/errno.h>
   55 #include <sys/syslog.h>
   56 #include <sys/queue.h>
   57 #include <sys/sysctl.h>
   58 #include <sys/mutex.h>
   59 
   60 #include <sys/thread2.h>
   61 #include <sys/mutex2.h>
   62 
   63 #include <net/if.h>
   64 #include <net/if_dl.h>
   65 #include <net/if_types.h>
   66 #include <net/if_atm.h>
   67 #include <net/route.h>
   68 
   69 #include <netinet/in.h>
   70 #include <netinet/if_ether.h>
   71 #include <netinet6/in6_var.h>
   72 #include <netinet/ip6.h>
   73 #include <netinet6/ip6_var.h>
   74 #include <netinet6/nd6.h>
   75 #include <netinet6/in6_prefix.h>
   76 #include <netinet/icmp6.h>
   77 
   78 #include <net/net_osdep.h>
   79 
   80 #define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */
   81 #define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */
   82 
   83 #define SIN6(s) ((struct sockaddr_in6 *)s)
   84 #define SDL(s) ((struct sockaddr_dl *)s)
   85 
   86 /* timer values */
   87 int     nd6_prune       = 1;    /* walk list every 1 seconds */
   88 int     nd6_delay       = 5;    /* delay first probe time 5 second */
   89 int     nd6_umaxtries   = 3;    /* maximum unicast query */
   90 int     nd6_mmaxtries   = 3;    /* maximum multicast query */
   91 int     nd6_useloopback = 1;    /* use loopback interface for local traffic */
   92 int     nd6_gctimer     = (60 * 60 * 24); /* 1 day: garbage collection timer */
   93 
   94 /* preventing too many loops in ND option parsing */
   95 int nd6_maxndopt = 10;  /* max # of ND options allowed */
   96 
   97 int nd6_maxnudhint = 0; /* max # of subsequent upper layer hints */
   98 
   99 #ifdef ND6_DEBUG
  100 int nd6_debug = 1;
  101 #else
  102 int nd6_debug = 0;
  103 #endif
  104 
  105 /* for debugging? */
  106 static int nd6_inuse, nd6_allocated;
  107 
  108 struct llinfo_nd6 llinfo_nd6 = {&llinfo_nd6, &llinfo_nd6};
  109 struct nd_drhead nd_defrouter;
  110 struct nd_prhead nd_prefix = { 0 };
  111 struct mtx nd6_mtx = MTX_INITIALIZER;
  112 
  113 int nd6_recalc_reachtm_interval = ND6_RECALC_REACHTM_INTERVAL;
  114 static struct sockaddr_in6 all1_sa;
  115 
  116 static void nd6_setmtu0 (struct ifnet *, struct nd_ifinfo *);
  117 static void nd6_slowtimo (void *);
  118 static int regen_tmpaddr (struct in6_ifaddr *);
  119 
  120 struct callout nd6_slowtimo_ch;
  121 struct callout nd6_timer_ch;
  122 extern struct callout in6_tmpaddrtimer_ch;
  123 
  124 void
  125 nd6_init(void)
  126 {
  127         static int nd6_init_done = 0;
  128         int i;
  129 
  130         if (nd6_init_done) {
  131                 log(LOG_NOTICE, "nd6_init called more than once(ignored)\n");
  132                 return;
  133         }
  134 
  135         all1_sa.sin6_family = AF_INET6;
  136         all1_sa.sin6_len = sizeof(struct sockaddr_in6);
  137         for (i = 0; i < sizeof(all1_sa.sin6_addr); i++)
  138                 all1_sa.sin6_addr.s6_addr[i] = 0xff;
  139 
  140         /* initialization of the default router list */
  141         TAILQ_INIT(&nd_defrouter);
  142 
  143         nd6_init_done = 1;
  144 
  145         /* start timer */
  146         callout_init(&nd6_slowtimo_ch);
  147         callout_reset(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
  148             nd6_slowtimo, NULL);
  149 }
  150 
  151 struct nd_ifinfo *
  152 nd6_ifattach(struct ifnet *ifp)
  153 {
  154         struct nd_ifinfo *nd;
  155 
  156         nd = (struct nd_ifinfo *)kmalloc(sizeof(*nd), M_IP6NDP,
  157             M_WAITOK | M_ZERO);
  158 
  159         nd->initialized = 1;
  160 
  161         nd->linkmtu = ifindex2ifnet[ifp->if_index]->if_mtu;
  162         nd->chlim = IPV6_DEFHLIM;
  163         nd->basereachable = REACHABLE_TIME;
  164         nd->reachable = ND_COMPUTE_RTIME(nd->basereachable);
  165         nd->retrans = RETRANS_TIMER;
  166         nd->receivedra = 0;
  167 
  168         /*
  169          * Note that the default value of ip6_accept_rtadv is 0, which means
  170          * we won't accept RAs by default even if we set ND6_IFF_ACCEPT_RTADV
  171          * here.
  172          */
  173         nd->flags = (ND6_IFF_PERFORMNUD | ND6_IFF_ACCEPT_RTADV);
  174 
  175         /* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */
  176         nd6_setmtu0(ifp, nd);
  177         return nd;
  178 }
  179 
  180 void
  181 nd6_ifdetach(struct nd_ifinfo *nd)
  182 {
  183         kfree(nd, M_IP6NDP);
  184 }
  185 
  186 /*
  187  * Reset ND level link MTU. This function is called when the physical MTU
  188  * changes, which means we might have to adjust the ND level MTU.
  189  */
  190 void
  191 nd6_setmtu(struct ifnet *ifp)
  192 {
  193         nd6_setmtu0(ifp, ND_IFINFO(ifp));
  194 }
  195 
  196 /* XXX todo: do not maintain copy of ifp->if_mtu in ndi->maxmtu */
  197 void
  198 nd6_setmtu0(struct ifnet *ifp, struct nd_ifinfo *ndi)
  199 {
  200         u_long oldmaxmtu;
  201         u_long oldlinkmtu;
  202 
  203         oldmaxmtu = ndi->maxmtu;
  204         oldlinkmtu = ndi->linkmtu;
  205 
  206         switch (ifp->if_type) {
  207         case IFT_ETHER:
  208                 ndi->maxmtu = MIN(ETHERMTU, ifp->if_mtu);
  209                 break;
  210         case IFT_ATM:
  211                 ndi->maxmtu = MIN(ATMMTU, ifp->if_mtu);
  212                 break;
  213         case IFT_IEEE1394:      /* XXX should be IEEE1394MTU(1500) */
  214                 ndi->maxmtu = MIN(ETHERMTU, ifp->if_mtu);
  215                 break;
  216 #ifdef IFT_IEEE80211
  217         case IFT_IEEE80211:     /* XXX should be IEEE80211MTU(1500) */
  218                 ndi->maxmtu = MIN(ETHERMTU, ifp->if_mtu);
  219                 break;
  220 #endif
  221         default:
  222                 ndi->maxmtu = ifp->if_mtu;
  223                 break;
  224         }
  225 
  226         if (oldmaxmtu != ndi->maxmtu) {
  227                 /*
  228                  * If the ND level MTU is not set yet, or if the maxmtu
  229                  * is reset to a smaller value than the ND level MTU,
  230                  * also reset the ND level MTU.
  231                  */
  232                 if (ndi->linkmtu == 0 ||
  233                     ndi->maxmtu < ndi->linkmtu) {
  234                         ndi->linkmtu = ndi->maxmtu;
  235                         /* also adjust in6_maxmtu if necessary. */
  236                         if (oldlinkmtu == 0) {
  237                                 /*
  238                                  * XXX: the case analysis is grotty, but
  239                                  * it is not efficient to call in6_setmaxmtu()
  240                                  * here when we are during the initialization
  241                                  * procedure.
  242                                  */
  243                                 if (in6_maxmtu < ndi->linkmtu)
  244                                         in6_maxmtu = ndi->linkmtu;
  245                         } else
  246                                 in6_setmaxmtu();
  247                 }
  248         }
  249 #undef MIN
  250 }
  251 
  252 void
  253 nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts)
  254 {
  255         bzero(ndopts, sizeof(*ndopts));
  256         ndopts->nd_opts_search = (struct nd_opt_hdr *)opt;
  257         ndopts->nd_opts_last
  258                 = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len);
  259 
  260         if (icmp6len == 0) {
  261                 ndopts->nd_opts_done = 1;
  262                 ndopts->nd_opts_search = NULL;
  263         }
  264 }
  265 
  266 /*
  267  * Take one ND option.
  268  */
  269 struct nd_opt_hdr *
  270 nd6_option(union nd_opts *ndopts)
  271 {
  272         struct nd_opt_hdr *nd_opt;
  273         int olen;
  274 
  275         if (!ndopts)
  276                 panic("ndopts == NULL in nd6_option");
  277         if (!ndopts->nd_opts_last)
  278                 panic("uninitialized ndopts in nd6_option");
  279         if (!ndopts->nd_opts_search)
  280                 return NULL;
  281         if (ndopts->nd_opts_done)
  282                 return NULL;
  283 
  284         nd_opt = ndopts->nd_opts_search;
  285 
  286         /* make sure nd_opt_len is inside the buffer */
  287         if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) {
  288                 bzero(ndopts, sizeof(*ndopts));
  289                 return NULL;
  290         }
  291 
  292         olen = nd_opt->nd_opt_len << 3;
  293         if (olen == 0) {
  294                 /*
  295                  * Message validation requires that all included
  296                  * options have a length that is greater than zero.
  297                  */
  298                 bzero(ndopts, sizeof(*ndopts));
  299                 return NULL;
  300         }
  301 
  302         ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen);
  303         if (ndopts->nd_opts_search > ndopts->nd_opts_last) {
  304                 /* option overruns the end of buffer, invalid */
  305                 bzero(ndopts, sizeof(*ndopts));
  306                 return NULL;
  307         } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) {
  308                 /* reached the end of options chain */
  309                 ndopts->nd_opts_done = 1;
  310                 ndopts->nd_opts_search = NULL;
  311         }
  312         return nd_opt;
  313 }
  314 
  315 /*
  316  * Parse multiple ND options.
  317  * This function is much easier to use, for ND routines that do not need
  318  * multiple options of the same type.
  319  */
  320 int
  321 nd6_options(union nd_opts *ndopts)
  322 {
  323         struct nd_opt_hdr *nd_opt;
  324         int i = 0;
  325 
  326         if (!ndopts)
  327                 panic("ndopts == NULL in nd6_options");
  328         if (!ndopts->nd_opts_last)
  329                 panic("uninitialized ndopts in nd6_options");
  330         if (!ndopts->nd_opts_search)
  331                 return 0;
  332 
  333         while (1) {
  334                 nd_opt = nd6_option(ndopts);
  335                 if (!nd_opt && !ndopts->nd_opts_last) {
  336                         /*
  337                          * Message validation requires that all included
  338                          * options have a length that is greater than zero.
  339                          */
  340                         icmp6stat.icp6s_nd_badopt++;
  341                         bzero(ndopts, sizeof(*ndopts));
  342                         return -1;
  343                 }
  344 
  345                 if (!nd_opt)
  346                         goto skip1;
  347 
  348                 switch (nd_opt->nd_opt_type) {
  349                 case ND_OPT_SOURCE_LINKADDR:
  350                 case ND_OPT_TARGET_LINKADDR:
  351                 case ND_OPT_MTU:
  352                 case ND_OPT_REDIRECTED_HEADER:
  353                         if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
  354                                 nd6log((LOG_INFO,
  355                                     "duplicated ND6 option found (type=%d)\n",
  356                                     nd_opt->nd_opt_type));
  357                                 /* XXX bark? */
  358                         } else {
  359                                 ndopts->nd_opt_array[nd_opt->nd_opt_type]
  360                                         = nd_opt;
  361                         }
  362                         break;
  363                 case ND_OPT_PREFIX_INFORMATION:
  364                         if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) {
  365                                 ndopts->nd_opt_array[nd_opt->nd_opt_type]
  366                                         = nd_opt;
  367                         }
  368                         ndopts->nd_opts_pi_end =
  369                                 (struct nd_opt_prefix_info *)nd_opt;
  370                         break;
  371                 default:
  372                         /*
  373                          * Unknown options must be silently ignored,
  374                          * to accomodate future extension to the protocol.
  375                          */
  376                         nd6log((LOG_DEBUG,
  377                             "nd6_options: unsupported option %d - "
  378                             "option ignored\n", nd_opt->nd_opt_type));
  379                 }
  380 
  381 skip1:
  382                 i++;
  383                 if (i > nd6_maxndopt) {
  384                         icmp6stat.icp6s_nd_toomanyopt++;
  385                         nd6log((LOG_INFO, "too many loop in nd opt\n"));
  386                         break;
  387                 }
  388 
  389                 if (ndopts->nd_opts_done)
  390                         break;
  391         }
  392 
  393         return 0;
  394 }
  395 
  396 /*
  397  * ND6 timer routine to expire default route list and prefix list
  398  */
  399 void
  400 nd6_timer(void *ignored_arg)
  401 {
  402         struct llinfo_nd6 *ln;
  403         struct nd_defrouter *dr;
  404         struct nd_prefix *pr;
  405         struct ifnet *ifp;
  406         struct in6_ifaddr *ia6, *nia6;
  407 
  408         mtx_lock(&nd6_mtx);
  409         callout_reset(&nd6_timer_ch, nd6_prune * hz,
  410                       nd6_timer, NULL);
  411 
  412         ln = llinfo_nd6.ln_next;
  413         while (ln && ln != &llinfo_nd6) {
  414                 struct rtentry *rt;
  415                 struct sockaddr_in6 *dst;
  416                 struct llinfo_nd6 *next = ln->ln_next;
  417                 /* XXX: used for the DELAY case only: */
  418                 struct nd_ifinfo *ndi = NULL;
  419 
  420                 if ((rt = ln->ln_rt) == NULL) {
  421                         ln = next;
  422                         continue;
  423                 }
  424                 if ((ifp = rt->rt_ifp) == NULL) {
  425                         ln = next;
  426                         continue;
  427                 }
  428                 ndi = ND_IFINFO(ifp);
  429                 dst = (struct sockaddr_in6 *)rt_key(rt);
  430 
  431                 if (ln->ln_expire > time_uptime) {
  432                         ln = next;
  433                         continue;
  434                 }
  435 
  436                 /* sanity check */
  437                 if (!rt)
  438                         panic("rt=0 in nd6_timer(ln=%p)", ln);
  439                 if (rt->rt_llinfo && (struct llinfo_nd6 *)rt->rt_llinfo != ln)
  440                         panic("rt_llinfo(%p) is not equal to ln(%p)",
  441                               rt->rt_llinfo, ln);
  442                 if (!dst)
  443                         panic("dst=0 in nd6_timer(ln=%p)", ln);
  444 
  445                 switch (ln->ln_state) {
  446                 case ND6_LLINFO_INCOMPLETE:
  447                         if (ln->ln_asked < nd6_mmaxtries) {
  448                                 ln->ln_asked++;
  449                                 ln->ln_expire = time_uptime +
  450                                         ND_IFINFO(ifp)->retrans / 1000;
  451                                 nd6_ns_output(ifp, NULL, &dst->sin6_addr,
  452                                         ln, 0);
  453                         } else {
  454                                 struct mbuf *m = ln->ln_hold;
  455                                 if (m) {
  456                                         if (rt->rt_ifp) {
  457                                                 /*
  458                                                  * Fake rcvif to make ICMP error
  459                                                  * more helpful in diagnosing
  460                                                  * for the receiver.
  461                                                  * XXX: should we consider
  462                                                  * older rcvif?
  463                                                  */
  464                                                 m->m_pkthdr.rcvif = rt->rt_ifp;
  465                                         }
  466                                         icmp6_error(m, ICMP6_DST_UNREACH,
  467                                                     ICMP6_DST_UNREACH_ADDR, 0);
  468                                         ln->ln_hold = NULL;
  469                                 }
  470                                 next = nd6_free(rt);
  471                         }
  472                         break;
  473                 case ND6_LLINFO_REACHABLE:
  474                         if (ln->ln_expire) {
  475                                 ln->ln_state = ND6_LLINFO_STALE;
  476                                 ln->ln_expire = time_uptime + nd6_gctimer;
  477                         }
  478                         break;
  479 
  480                 case ND6_LLINFO_STALE:
  481                         /* Garbage Collection(RFC 2461 5.3) */
  482                         if (ln->ln_expire)
  483                                 next = nd6_free(rt);
  484                         break;
  485 
  486                 case ND6_LLINFO_DELAY:
  487                         if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD)) {
  488                                 /* We need NUD */
  489                                 ln->ln_asked = 1;
  490                                 ln->ln_state = ND6_LLINFO_PROBE;
  491                                 ln->ln_expire = time_uptime +
  492                                         ndi->retrans / 1000;
  493                                 nd6_ns_output(ifp, &dst->sin6_addr,
  494                                               &dst->sin6_addr,
  495                                               ln, 0);
  496                         } else {
  497                                 ln->ln_state = ND6_LLINFO_STALE; /* XXX */
  498                                 ln->ln_expire = time_uptime + nd6_gctimer;
  499                         }
  500                         break;
  501                 case ND6_LLINFO_PROBE:
  502                         if (ln->ln_asked < nd6_umaxtries) {
  503                                 ln->ln_asked++;
  504                                 ln->ln_expire = time_uptime +
  505                                         ND_IFINFO(ifp)->retrans / 1000;
  506                                 nd6_ns_output(ifp, &dst->sin6_addr,
  507                                                &dst->sin6_addr, ln, 0);
  508                         } else {
  509                                 next = nd6_free(rt);
  510                         }
  511                         break;
  512                 }
  513                 ln = next;
  514         }
  515 
  516         /* expire default router list */
  517         dr = TAILQ_FIRST(&nd_defrouter);
  518         while (dr) {
  519                 if (dr->expire && dr->expire < time_uptime) {
  520                         struct nd_defrouter *t;
  521                         t = TAILQ_NEXT(dr, dr_entry);
  522                         defrtrlist_del(dr);
  523                         dr = t;
  524                 } else {
  525                         dr = TAILQ_NEXT(dr, dr_entry);
  526                 }
  527         }
  528 
  529         /*
  530          * expire interface addresses.
  531          * in the past the loop was inside prefix expiry processing.
  532          * However, from a stricter speci-confrmance standpoint, we should
  533          * rather separate address lifetimes and prefix lifetimes.
  534          */
  535 addrloop:
  536         for (ia6 = in6_ifaddr; ia6; ia6 = nia6) {
  537                 nia6 = ia6->ia_next;
  538                 /* check address lifetime */
  539                 if (IFA6_IS_INVALID(ia6)) {
  540                         int regen = 0;
  541 
  542                         /*
  543                          * If the expiring address is temporary, try
  544                          * regenerating a new one.  This would be useful when
  545                          * we suspended a laptop PC, then turned it on after a
  546                          * period that could invalidate all temporary
  547                          * addresses.  Although we may have to restart the
  548                          * loop (see below), it must be after purging the
  549                          * address.  Otherwise, we'd see an infinite loop of
  550                          * regeneration.
  551                          */
  552                         if (ip6_use_tempaddr &&
  553                             (ia6->ia6_flags & IN6_IFF_TEMPORARY)) {
  554                                 if (regen_tmpaddr(ia6) == 0)
  555                                         regen = 1;
  556                         }
  557 
  558                         in6_purgeaddr(&ia6->ia_ifa);
  559 
  560                         if (regen)
  561                                 goto addrloop; /* XXX: see below */
  562                 }
  563                 if (IFA6_IS_DEPRECATED(ia6)) {
  564                         int oldflags = ia6->ia6_flags;
  565 
  566                         ia6->ia6_flags |= IN6_IFF_DEPRECATED;
  567 
  568                         /*
  569                          * If a temporary address has just become deprecated,
  570                          * regenerate a new one if possible.
  571                          */
  572                         if (ip6_use_tempaddr &&
  573                             (ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
  574                             !(oldflags & IN6_IFF_DEPRECATED)) {
  575 
  576                                 if (regen_tmpaddr(ia6) == 0) {
  577                                         /*
  578                                          * A new temporary address is
  579                                          * generated.
  580                                          * XXX: this means the address chain
  581                                          * has changed while we are still in
  582                                          * the loop.  Although the change
  583                                          * would not cause disaster (because
  584                                          * it's not a deletion, but an
  585                                          * addition,) we'd rather restart the
  586                                          * loop just for safety.  Or does this
  587                                          * significantly reduce performance??
  588                                          */
  589                                         goto addrloop;
  590                                 }
  591                         }
  592                 } else {
  593                         /*
  594                          * A new RA might have made a deprecated address
  595                          * preferred.
  596                          */
  597                         ia6->ia6_flags &= ~IN6_IFF_DEPRECATED;
  598                 }
  599         }
  600 
  601         /* expire prefix list */
  602         pr = nd_prefix.lh_first;
  603         while (pr) {
  604                 /*
  605                  * check prefix lifetime.
  606                  * since pltime is just for autoconf, pltime processing for
  607                  * prefix is not necessary.
  608                  */
  609                 if (pr->ndpr_expire && pr->ndpr_expire < time_uptime) {
  610                         struct nd_prefix *t;
  611                         t = pr->ndpr_next;
  612 
  613                         /*
  614                          * address expiration and prefix expiration are
  615                          * separate.  NEVER perform in6_purgeaddr here.
  616                          */
  617 
  618                         prelist_remove(pr);
  619                         pr = t;
  620                 } else
  621                         pr = pr->ndpr_next;
  622         }
  623         mtx_unlock(&nd6_mtx);
  624 }
  625 
  626 static int
  627 regen_tmpaddr(struct in6_ifaddr *ia6) /* deprecated/invalidated temporary
  628                                          address */
  629 {
  630         struct ifaddr_container *ifac;
  631         struct ifnet *ifp;
  632         struct in6_ifaddr *public_ifa6 = NULL;
  633 
  634         ifp = ia6->ia_ifa.ifa_ifp;
  635         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
  636                 struct ifaddr *ifa = ifac->ifa;
  637                 struct in6_ifaddr *it6;
  638 
  639                 if (ifa->ifa_addr->sa_family != AF_INET6)
  640                         continue;
  641 
  642                 it6 = (struct in6_ifaddr *)ifa;
  643 
  644                 /* ignore no autoconf addresses. */
  645                 if (!(it6->ia6_flags & IN6_IFF_AUTOCONF))
  646                         continue;
  647 
  648                 /* ignore autoconf addresses with different prefixes. */
  649                 if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr)
  650                         continue;
  651 
  652                 /*
  653                  * Now we are looking at an autoconf address with the same
  654                  * prefix as ours.  If the address is temporary and is still
  655                  * preferred, do not create another one.  It would be rare, but
  656                  * could happen, for example, when we resume a laptop PC after
  657                  * a long period.
  658                  */
  659                 if ((it6->ia6_flags & IN6_IFF_TEMPORARY) &&
  660                     !IFA6_IS_DEPRECATED(it6)) {
  661                         public_ifa6 = NULL;
  662                         break;
  663                 }
  664 
  665                 /*
  666                  * This is a public autoconf address that has the same prefix
  667                  * as ours.  If it is preferred, keep it.  We can't break the
  668                  * loop here, because there may be a still-preferred temporary
  669                  * address with the prefix.
  670                  */
  671                 if (!IFA6_IS_DEPRECATED(it6))
  672                     public_ifa6 = it6;
  673         }
  674 
  675         if (public_ifa6 != NULL) {
  676                 int e;
  677 
  678                 if ((e = in6_tmpifadd(public_ifa6, 0)) != 0) {
  679                         log(LOG_NOTICE, "regen_tmpaddr: failed to create a new"
  680                             " tmp addr,errno=%d\n", e);
  681                         return (-1);
  682                 }
  683                 return (0);
  684         }
  685 
  686         return (-1);
  687 }
  688 
  689 /*
  690  * Nuke neighbor cache/prefix/default router management table, right before
  691  * ifp goes away.
  692  */
  693 void
  694 nd6_purge(struct ifnet *ifp)
  695 {
  696         struct llinfo_nd6 *ln, *nln;
  697         struct nd_defrouter *dr, *ndr, drany;
  698         struct nd_prefix *pr, *npr;
  699 
  700         /* Nuke default router list entries toward ifp */
  701         if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) {
  702                 /*
  703                  * The first entry of the list may be stored in
  704                  * the routing table, so we'll delete it later.
  705                  */
  706                 for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = ndr) {
  707                         ndr = TAILQ_NEXT(dr, dr_entry);
  708                         if (dr->ifp == ifp)
  709                                 defrtrlist_del(dr);
  710                 }
  711                 dr = TAILQ_FIRST(&nd_defrouter);
  712                 if (dr->ifp == ifp)
  713                         defrtrlist_del(dr);
  714         }
  715 
  716         /* Nuke prefix list entries toward ifp */
  717         for (pr = nd_prefix.lh_first; pr; pr = npr) {
  718                 npr = pr->ndpr_next;
  719                 if (pr->ndpr_ifp == ifp) {
  720                         /*
  721                          * Previously, pr->ndpr_addr is removed as well,
  722                          * but I strongly believe we don't have to do it.
  723                          * nd6_purge() is only called from in6_ifdetach(),
  724                          * which removes all the associated interface addresses
  725                          * by itself.
  726                          * (jinmei@kame.net 20010129)
  727                          */
  728                         prelist_remove(pr);
  729                 }
  730         }
  731 
  732         /* cancel default outgoing interface setting */
  733         if (nd6_defifindex == ifp->if_index)
  734                 nd6_setdefaultiface(0);
  735 
  736         if (!ip6_forwarding && ip6_accept_rtadv) { /* XXX: too restrictive? */
  737                 /* refresh default router list */
  738                 bzero(&drany, sizeof(drany));
  739                 defrouter_delreq(&drany, 0);
  740                 defrouter_select();
  741         }
  742 
  743         /*
  744          * Nuke neighbor cache entries for the ifp.
  745          * Note that rt->rt_ifp may not be the same as ifp,
  746          * due to KAME goto ours hack.  See RTM_RESOLVE case in
  747          * nd6_rtrequest(), and ip6_input().
  748          */
  749         ln = llinfo_nd6.ln_next;
  750         while (ln && ln != &llinfo_nd6) {
  751                 struct rtentry *rt;
  752                 struct sockaddr_dl *sdl;
  753 
  754                 nln = ln->ln_next;
  755                 rt = ln->ln_rt;
  756                 if (rt && rt->rt_gateway &&
  757                     rt->rt_gateway->sa_family == AF_LINK) {
  758                         sdl = (struct sockaddr_dl *)rt->rt_gateway;
  759                         if (sdl->sdl_index == ifp->if_index)
  760                                 nln = nd6_free(rt);
  761                 }
  762                 ln = nln;
  763         }
  764 }
  765 
  766 struct rtentry *
  767 nd6_lookup(struct in6_addr *addr6, int create, struct ifnet *ifp)
  768 {
  769         struct rtentry *rt;
  770         struct sockaddr_in6 sin6;
  771 
  772         bzero(&sin6, sizeof(sin6));
  773         sin6.sin6_len = sizeof(struct sockaddr_in6);
  774         sin6.sin6_family = AF_INET6;
  775         sin6.sin6_addr = *addr6;
  776 
  777         if (create)
  778                 rt = rtlookup((struct sockaddr *)&sin6);
  779         else
  780                 rt = rtpurelookup((struct sockaddr *)&sin6);
  781         if (rt && !(rt->rt_flags & RTF_LLINFO)) {
  782                 /*
  783                  * This is the case for the default route.
  784                  * If we want to create a neighbor cache for the address, we
  785                  * should free the route for the destination and allocate an
  786                  * interface route.
  787                  */
  788                 if (create) {
  789                         --rt->rt_refcnt;
  790                         rt = NULL;
  791                 }
  792         }
  793         if (!rt) {
  794                 if (create && ifp) {
  795                         int e;
  796 
  797                         /*
  798                          * If no route is available and create is set,
  799                          * we allocate a host route for the destination
  800                          * and treat it like an interface route.
  801                          * This hack is necessary for a neighbor which can't
  802                          * be covered by our own prefix.
  803                          */
  804                         struct ifaddr *ifa =
  805                                 ifaof_ifpforaddr((struct sockaddr *)&sin6, ifp);
  806                         if (ifa == NULL)
  807                                 return (NULL);
  808 
  809                         /*
  810                          * Create a new route.  RTF_LLINFO is necessary
  811                          * to create a Neighbor Cache entry for the
  812                          * destination in nd6_rtrequest which will be
  813                          * called in rtrequest via ifa->ifa_rtrequest.
  814                          */
  815                         if ((e = rtrequest(RTM_ADD, (struct sockaddr *)&sin6,
  816                                            ifa->ifa_addr,
  817                                            (struct sockaddr *)&all1_sa,
  818                                            (ifa->ifa_flags |
  819                                             RTF_HOST | RTF_LLINFO) &
  820                                            ~RTF_CLONING,
  821                                            &rt)) != 0)
  822                                 log(LOG_ERR,
  823                                     "nd6_lookup: failed to add route for a "
  824                                     "neighbor(%s), errno=%d\n",
  825                                     ip6_sprintf(addr6), e);
  826                         if (rt == NULL)
  827                                 return (NULL);
  828                         if (rt->rt_llinfo) {
  829                                 struct llinfo_nd6 *ln =
  830                                         (struct llinfo_nd6 *)rt->rt_llinfo;
  831                                 ln->ln_state = ND6_LLINFO_NOSTATE;
  832                         }
  833                 } else
  834                         return (NULL);
  835         }
  836         rt->rt_refcnt--;
  837         /*
  838          * Validation for the entry.
  839          * Note that the check for rt_llinfo is necessary because a cloned
  840          * route from a parent route that has the L flag (e.g. the default
  841          * route to a p2p interface) may have the flag, too, while the
  842          * destination is not actually a neighbor.
  843          * XXX: we can't use rt->rt_ifp to check for the interface, since
  844          *      it might be the loopback interface if the entry is for our
  845          *      own address on a non-loopback interface. Instead, we should
  846          *      use rt->rt_ifa->ifa_ifp, which would specify the REAL
  847          *      interface.
  848          */
  849         if ((rt->rt_flags & RTF_GATEWAY) || !(rt->rt_flags & RTF_LLINFO) ||
  850             rt->rt_gateway->sa_family != AF_LINK || rt->rt_llinfo == NULL ||
  851             (ifp && rt->rt_ifa->ifa_ifp != ifp)) {
  852                 if (create) {
  853                         log(LOG_DEBUG, "nd6_lookup: failed to lookup %s (if = %s)\n",
  854                             ip6_sprintf(addr6), ifp ? if_name(ifp) : "unspec");
  855                         /* xxx more logs... kazu */
  856                 }
  857                 return (NULL);
  858         }
  859         return (rt);
  860 }
  861 
  862 /*
  863  * Detect if a given IPv6 address identifies a neighbor on a given link.
  864  * XXX: should take care of the destination of a p2p link?
  865  */
  866 int
  867 nd6_is_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp)
  868 {
  869         struct ifaddr_container *ifac;
  870         int i;
  871 
  872 #define IFADDR6(a) ((((struct in6_ifaddr *)(a))->ia_addr).sin6_addr)
  873 #define IFMASK6(a) ((((struct in6_ifaddr *)(a))->ia_prefixmask).sin6_addr)
  874 
  875         /*
  876          * A link-local address is always a neighbor.
  877          * XXX: we should use the sin6_scope_id field rather than the embedded
  878          * interface index.
  879          */
  880         if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr) &&
  881             ntohs(*(u_int16_t *)&addr->sin6_addr.s6_addr[2]) == ifp->if_index)
  882                 return (1);
  883 
  884         /*
  885          * If the address matches one of our addresses,
  886          * it should be a neighbor.
  887          */
  888         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
  889                 struct ifaddr *ifa = ifac->ifa;
  890 
  891                 if (ifa->ifa_addr->sa_family != AF_INET6)
  892                         next: continue;
  893 
  894                 for (i = 0; i < 4; i++) {
  895                         if ((IFADDR6(ifa).s6_addr32[i] ^
  896                              addr->sin6_addr.s6_addr32[i]) &
  897                             IFMASK6(ifa).s6_addr32[i])
  898                                 goto next;
  899                 }
  900                 return (1);
  901         }
  902 
  903         /*
  904          * Even if the address matches none of our addresses, it might be
  905          * in the neighbor cache.
  906          */
  907         if (nd6_lookup(&addr->sin6_addr, 0, ifp) != NULL)
  908                 return (1);
  909 
  910         return (0);
  911 #undef IFADDR6
  912 #undef IFMASK6
  913 }
  914 
  915 /*
  916  * Free an nd6 llinfo entry.
  917  */
  918 struct llinfo_nd6 *
  919 nd6_free(struct rtentry *rt)
  920 {
  921         struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo, *next;
  922         struct in6_addr in6 = ((struct sockaddr_in6 *)rt_key(rt))->sin6_addr;
  923         struct nd_defrouter *dr;
  924 
  925         /*
  926          * we used to have kpfctlinput(PRC_HOSTDEAD) here.
  927          * even though it is not harmful, it was not really necessary.
  928          */
  929 
  930         if (!ip6_forwarding && ip6_accept_rtadv) { /* XXX: too restrictive? */
  931                 mtx_lock(&nd6_mtx);
  932                 dr = defrouter_lookup(&((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
  933                                       rt->rt_ifp);
  934 
  935                 if (ln->ln_router || dr) {
  936                         /*
  937                          * rt6_flush must be called whether or not the neighbor
  938                          * is in the Default Router List.
  939                          * See a corresponding comment in nd6_na_input().
  940                          */
  941                         rt6_flush(&in6, rt->rt_ifp);
  942                 }
  943 
  944                 if (dr) {
  945                         /*
  946                          * Unreachablity of a router might affect the default
  947                          * router selection and on-link detection of advertised
  948                          * prefixes.
  949                          */
  950 
  951                         /*
  952                          * Temporarily fake the state to choose a new default
  953                          * router and to perform on-link determination of
  954                          * prefixes correctly.
  955                          * Below the state will be set correctly,
  956                          * or the entry itself will be deleted.
  957                          */
  958                         ln->ln_state = ND6_LLINFO_INCOMPLETE;
  959 
  960                         /*
  961                          * Since defrouter_select() does not affect the
  962                          * on-link determination and MIP6 needs the check
  963                          * before the default router selection, we perform
  964                          * the check now.
  965                          */
  966                         pfxlist_onlink_check();
  967 
  968                         if (dr == TAILQ_FIRST(&nd_defrouter)) {
  969                                 /*
  970                                  * It is used as the current default router,
  971                                  * so we have to move it to the end of the
  972                                  * list and choose a new one.
  973                                  * XXX: it is not very efficient if this is
  974                                  *      the only router.
  975                                  */
  976                                 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
  977                                 TAILQ_INSERT_TAIL(&nd_defrouter, dr, dr_entry);
  978 
  979                                 defrouter_select();
  980                         }
  981                 }
  982                 mtx_unlock(&nd6_mtx);
  983         }
  984 
  985         /*
  986          * Before deleting the entry, remember the next entry as the
  987          * return value.  We need this because pfxlist_onlink_check() above
  988          * might have freed other entries (particularly the old next entry) as
  989          * a side effect (XXX).
  990          */
  991         next = ln->ln_next;
  992 
  993         /*
  994          * Detach the route from the routing tree and the list of neighbor
  995          * caches, and disable the route entry not to be used in already
  996          * cached routes.
  997          */
  998         rtrequest(RTM_DELETE, rt_key(rt), NULL, rt_mask(rt), 0, NULL);
  999 
 1000         return (next);
 1001 }
 1002 
 1003 /*
 1004  * Upper-layer reachability hint for Neighbor Unreachability Detection.
 1005  *
 1006  * XXX cost-effective metods?
 1007  */
 1008 void
 1009 nd6_nud_hint(struct rtentry *rt, struct in6_addr *dst6, int force)
 1010 {
 1011         struct llinfo_nd6 *ln;
 1012 
 1013         /*
 1014          * If the caller specified "rt", use that.  Otherwise, resolve the
 1015          * routing table by supplied "dst6".
 1016          */
 1017         if (!rt) {
 1018                 if (!dst6)
 1019                         return;
 1020                 if (!(rt = nd6_lookup(dst6, 0, NULL)))
 1021                         return;
 1022         }
 1023 
 1024         if ((rt->rt_flags & RTF_GATEWAY) ||
 1025             !(rt->rt_flags & RTF_LLINFO) ||
 1026             rt->rt_llinfo == NULL || rt->rt_gateway == NULL ||
 1027             rt->rt_gateway->sa_family != AF_LINK) {
 1028                 /* This is not a host route. */
 1029                 return;
 1030         }
 1031 
 1032         ln = (struct llinfo_nd6 *)rt->rt_llinfo;
 1033         if (ln->ln_state < ND6_LLINFO_REACHABLE)
 1034                 return;
 1035 
 1036         /*
 1037          * if we get upper-layer reachability confirmation many times,
 1038          * it is possible we have false information.
 1039          */
 1040         if (!force) {
 1041                 ln->ln_byhint++;
 1042                 if (ln->ln_byhint > nd6_maxnudhint)
 1043                         return;
 1044         }
 1045 
 1046         ln->ln_state = ND6_LLINFO_REACHABLE;
 1047         if (ln->ln_expire)
 1048                 ln->ln_expire = time_uptime +
 1049                         ND_IFINFO(rt->rt_ifp)->reachable;
 1050 }
 1051 
 1052 void
 1053 nd6_rtrequest(int req, struct rtentry *rt)
 1054 {
 1055         struct sockaddr *gate = rt->rt_gateway;
 1056         struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo;
 1057         static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
 1058         struct ifnet *ifp = rt->rt_ifp;
 1059         struct ifaddr *ifa;
 1060 
 1061         if ((rt->rt_flags & RTF_GATEWAY))
 1062                 return;
 1063 
 1064         if (nd6_need_cache(ifp) == 0 && !(rt->rt_flags & RTF_HOST)) {
 1065                 /*
 1066                  * This is probably an interface direct route for a link
 1067                  * which does not need neighbor caches (e.g. fe80::%lo0/64).
 1068                  * We do not need special treatment below for such a route.
 1069                  * Moreover, the RTF_LLINFO flag which would be set below
 1070                  * would annoy the ndp(8) command.
 1071                  */
 1072                 return;
 1073         }
 1074 
 1075         if (req == RTM_RESOLVE &&
 1076             (nd6_need_cache(ifp) == 0 || /* stf case */
 1077              !nd6_is_addr_neighbor((struct sockaddr_in6 *)rt_key(rt), ifp))) {
 1078                 /*
 1079                  * FreeBSD and BSD/OS often make a cloned host route based
 1080                  * on a less-specific route (e.g. the default route).
 1081                  * If the less specific route does not have a "gateway"
 1082                  * (this is the case when the route just goes to a p2p or an
 1083                  * stf interface), we'll mistakenly make a neighbor cache for
 1084                  * the host route, and will see strange neighbor solicitation
 1085                  * for the corresponding destination.  In order to avoid the
 1086                  * confusion, we check if the destination of the route is
 1087                  * a neighbor in terms of neighbor discovery, and stop the
 1088                  * process if not.  Additionally, we remove the LLINFO flag
 1089                  * so that ndp(8) will not try to get the neighbor information
 1090                  * of the destination.
 1091                  */
 1092                 rt->rt_flags &= ~RTF_LLINFO;
 1093                 return;
 1094         }
 1095 
 1096         switch (req) {
 1097         case RTM_ADD:
 1098                 /*
 1099                  * There is no backward compatibility :)
 1100                  *
 1101                  * if (!(rt->rt_flags & RTF_HOST) &&
 1102                  *     SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff)
 1103                  *         rt->rt_flags |= RTF_CLONING;
 1104                  */
 1105                 if (rt->rt_flags & (RTF_CLONING | RTF_LLINFO)) {
 1106                         /*
 1107                          * Case 1: This route should come from
 1108                          * a route to interface.  RTF_LLINFO flag is set
 1109                          * for a host route whose destination should be
 1110                          * treated as on-link.
 1111                          */
 1112                         rt_setgate(rt, rt_key(rt),
 1113                                    (struct sockaddr *)&null_sdl,
 1114                                    RTL_DONTREPORT);
 1115                         gate = rt->rt_gateway;
 1116                         SDL(gate)->sdl_type = ifp->if_type;
 1117                         SDL(gate)->sdl_index = ifp->if_index;
 1118                         if (ln)
 1119                                 ln->ln_expire = time_uptime;
 1120 #if 1
 1121                         if (ln && ln->ln_expire == 0) {
 1122                                 /* kludge for desktops */
 1123 #if 0
 1124                                 kprintf("nd6_rtequest: time.tv_sec is zero; "
 1125                                        "treat it as 1\n");
 1126 #endif
 1127                                 ln->ln_expire = 1;
 1128                         }
 1129 #endif
 1130                         if ((rt->rt_flags & RTF_CLONING))
 1131                                 break;
 1132                 }
 1133                 /*
 1134                  * In IPv4 code, we try to annonuce new RTF_ANNOUNCE entry here.
 1135                  * We don't do that here since llinfo is not ready yet.
 1136                  *
 1137                  * There are also couple of other things to be discussed:
 1138                  * - unsolicited NA code needs improvement beforehand
 1139                  * - RFC2461 says we MAY send multicast unsolicited NA
 1140                  *   (7.2.6 paragraph 4), however, it also says that we
 1141                  *   SHOULD provide a mechanism to prevent multicast NA storm.
 1142                  *   we don't have anything like it right now.
 1143                  *   note that the mechanism needs a mutual agreement
 1144                  *   between proxies, which means that we need to implement
 1145                  *   a new protocol, or a new kludge.
 1146                  * - from RFC2461 6.2.4, host MUST NOT send an unsolicited NA.
 1147                  *   we need to check ip6forwarding before sending it.
 1148                  *   (or should we allow proxy ND configuration only for
 1149                  *   routers?  there's no mention about proxy ND from hosts)
 1150                  */
 1151 #if 0
 1152                 /* XXX it does not work */
 1153                 if (rt->rt_flags & RTF_ANNOUNCE)
 1154                         nd6_na_output(ifp,
 1155                               &SIN6(rt_key(rt))->sin6_addr,
 1156                               &SIN6(rt_key(rt))->sin6_addr,
 1157                               ip6_forwarding ? ND_NA_FLAG_ROUTER : 0,
 1158                               1, NULL);
 1159 #endif
 1160                 /* FALLTHROUGH */
 1161         case RTM_RESOLVE:
 1162                 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) {
 1163                         /*
 1164                          * Address resolution isn't necessary for a point to
 1165                          * point link, so we can skip this test for a p2p link.
 1166                          */
 1167                         if (gate->sa_family != AF_LINK ||
 1168                             gate->sa_len < sizeof(null_sdl)) {
 1169                                 log(LOG_DEBUG,
 1170                                     "nd6_rtrequest: bad gateway value: %s\n",
 1171                                     if_name(ifp));
 1172                                 break;
 1173                         }
 1174                         SDL(gate)->sdl_type = ifp->if_type;
 1175                         SDL(gate)->sdl_index = ifp->if_index;
 1176                 }
 1177                 if (ln != NULL)
 1178                         break;  /* This happens on a route change */
 1179                 /*
 1180                  * Case 2: This route may come from cloning, or a manual route
 1181                  * add with a LL address.
 1182                  */
 1183                 R_Malloc(ln, struct llinfo_nd6 *, sizeof(*ln));
 1184                 rt->rt_llinfo = (caddr_t)ln;
 1185                 if (!ln) {
 1186                         log(LOG_DEBUG, "nd6_rtrequest: malloc failed\n");
 1187                         break;
 1188                 }
 1189                 nd6_inuse++;
 1190                 nd6_allocated++;
 1191                 bzero(ln, sizeof(*ln));
 1192                 ln->ln_rt = rt;
 1193                 /* this is required for "ndp" command. - shin */
 1194                 if (req == RTM_ADD) {
 1195                         /*
 1196                          * gate should have some valid AF_LINK entry,
 1197                          * and ln->ln_expire should have some lifetime
 1198                          * which is specified by ndp command.
 1199                          */
 1200                         ln->ln_state = ND6_LLINFO_REACHABLE;
 1201                         ln->ln_byhint = 0;
 1202                 } else {
 1203                         /*
 1204                          * When req == RTM_RESOLVE, rt is created and
 1205                          * initialized in rtrequest(), so rt_expire is 0.
 1206                          */
 1207                         ln->ln_state = ND6_LLINFO_NOSTATE;
 1208                         ln->ln_expire = time_uptime;
 1209                 }
 1210                 rt->rt_flags |= RTF_LLINFO;
 1211                 ln->ln_next = llinfo_nd6.ln_next;
 1212                 llinfo_nd6.ln_next = ln;
 1213                 ln->ln_prev = &llinfo_nd6;
 1214                 ln->ln_next->ln_prev = ln;
 1215 
 1216                 /*
 1217                  * check if rt_key(rt) is one of my address assigned
 1218                  * to the interface.
 1219                  */
 1220                 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(rt->rt_ifp,
 1221                                           &SIN6(rt_key(rt))->sin6_addr);
 1222                 if (ifa) {
 1223                         caddr_t macp = nd6_ifptomac(ifp);
 1224                         ln->ln_expire = 0;
 1225                         ln->ln_state = ND6_LLINFO_REACHABLE;
 1226                         ln->ln_byhint = 0;
 1227                         if (macp) {
 1228                                 bcopy(macp, LLADDR(SDL(gate)), ifp->if_addrlen);
 1229                                 SDL(gate)->sdl_alen = ifp->if_addrlen;
 1230                         }
 1231                         if (nd6_useloopback) {
 1232                                 rt->rt_ifp = &loif[0];  /* XXX */
 1233                                 /*
 1234                                  * Make sure rt_ifa be equal to the ifaddr
 1235                                  * corresponding to the address.
 1236                                  * We need this because when we refer
 1237                                  * rt_ifa->ia6_flags in ip6_input, we assume
 1238                                  * that the rt_ifa points to the address instead
 1239                                  * of the loopback address.
 1240                                  */
 1241                                 if (ifa != rt->rt_ifa) {
 1242                                         IFAFREE(rt->rt_ifa);
 1243                                         IFAREF(ifa);
 1244                                         rt->rt_ifa = ifa;
 1245                                 }
 1246                         }
 1247                 } else if (rt->rt_flags & RTF_ANNOUNCE) {
 1248                         ln->ln_expire = 0;
 1249                         ln->ln_state = ND6_LLINFO_REACHABLE;
 1250                         ln->ln_byhint = 0;
 1251 
 1252                         /* join solicited node multicast for proxy ND */
 1253                         if (ifp->if_flags & IFF_MULTICAST) {
 1254                                 struct in6_addr llsol;
 1255                                 int error;
 1256 
 1257                                 llsol = SIN6(rt_key(rt))->sin6_addr;
 1258                                 llsol.s6_addr16[0] = htons(0xff02);
 1259                                 llsol.s6_addr16[1] = htons(ifp->if_index);
 1260                                 llsol.s6_addr32[1] = 0;
 1261                                 llsol.s6_addr32[2] = htonl(1);
 1262                                 llsol.s6_addr8[12] = 0xff;
 1263 
 1264                                 if (!in6_addmulti(&llsol, ifp, &error)) {
 1265                                         nd6log((LOG_ERR, "%s: failed to join "
 1266                                             "%s (errno=%d)\n", if_name(ifp),
 1267                                             ip6_sprintf(&llsol), error));
 1268                                 }
 1269                         }
 1270                 }
 1271                 break;
 1272 
 1273         case RTM_DELETE:
 1274                 if (!ln)
 1275                         break;
 1276                 /* leave from solicited node multicast for proxy ND */
 1277                 if ((rt->rt_flags & RTF_ANNOUNCE) &&
 1278                     (ifp->if_flags & IFF_MULTICAST)) {
 1279                         struct in6_addr llsol;
 1280                         struct in6_multi *in6m;
 1281 
 1282                         llsol = SIN6(rt_key(rt))->sin6_addr;
 1283                         llsol.s6_addr16[0] = htons(0xff02);
 1284                         llsol.s6_addr16[1] = htons(ifp->if_index);
 1285                         llsol.s6_addr32[1] = 0;
 1286                         llsol.s6_addr32[2] = htonl(1);
 1287                         llsol.s6_addr8[12] = 0xff;
 1288 
 1289                         IN6_LOOKUP_MULTI(llsol, ifp, in6m);
 1290                         if (in6m)
 1291                                 in6_delmulti(in6m);
 1292                 }
 1293                 nd6_inuse--;
 1294                 ln->ln_next->ln_prev = ln->ln_prev;
 1295                 ln->ln_prev->ln_next = ln->ln_next;
 1296                 ln->ln_prev = NULL;
 1297                 rt->rt_llinfo = 0;
 1298                 rt->rt_flags &= ~RTF_LLINFO;
 1299                 if (ln->ln_hold)
 1300                         m_freem(ln->ln_hold);
 1301                 Free((caddr_t)ln);
 1302         }
 1303 }
 1304 
 1305 int
 1306 nd6_ioctl(u_long cmd, caddr_t   data, struct ifnet *ifp)
 1307 {
 1308         struct in6_drlist *drl = (struct in6_drlist *)data;
 1309         struct in6_prlist *prl = (struct in6_prlist *)data;
 1310         struct in6_ndireq *ndi = (struct in6_ndireq *)data;
 1311         struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data;
 1312         struct in6_ndifreq *ndif = (struct in6_ndifreq *)data;
 1313         struct nd_defrouter *dr, any;
 1314         struct nd_prefix *pr;
 1315         struct rtentry *rt;
 1316         int i = 0, error = 0;
 1317 
 1318         switch (cmd) {
 1319         case SIOCGDRLST_IN6:
 1320                 /*
 1321                  * obsolete API, use sysctl under net.inet6.icmp6
 1322                  */
 1323                 bzero(drl, sizeof(*drl));
 1324                 mtx_lock(&nd6_mtx);
 1325                 dr = TAILQ_FIRST(&nd_defrouter);
 1326                 while (dr && i < DRLSTSIZ) {
 1327                         drl->defrouter[i].rtaddr = dr->rtaddr;
 1328                         if (IN6_IS_ADDR_LINKLOCAL(&drl->defrouter[i].rtaddr)) {
 1329                                 /* XXX: need to this hack for KAME stack */
 1330                                 drl->defrouter[i].rtaddr.s6_addr16[1] = 0;
 1331                         } else
 1332                                 log(LOG_ERR,
 1333                                     "default router list contains a "
 1334                                     "non-linklocal address(%s)\n",
 1335                                     ip6_sprintf(&drl->defrouter[i].rtaddr));
 1336 
 1337                         drl->defrouter[i].flags = dr->flags;
 1338                         drl->defrouter[i].rtlifetime = dr->rtlifetime;
 1339                         drl->defrouter[i].expire = dr->expire;
 1340                         drl->defrouter[i].if_index = dr->ifp->if_index;
 1341                         i++;
 1342                         dr = TAILQ_NEXT(dr, dr_entry);
 1343                 }
 1344                 mtx_unlock(&nd6_mtx);
 1345                 break;
 1346         case SIOCGPRLST_IN6:
 1347                 /*
 1348                  * obsolete API, use sysctl under net.inet6.icmp6
 1349                  */
 1350                 /*
 1351                  * XXX meaning of fields, especialy "raflags", is very
 1352                  * differnet between RA prefix list and RR/static prefix list.
 1353                  * how about separating ioctls into two?
 1354                  */
 1355                 bzero(prl, sizeof(*prl));
 1356                 mtx_lock(&nd6_mtx);
 1357                 pr = nd_prefix.lh_first;
 1358                 while (pr && i < PRLSTSIZ) {
 1359                         struct nd_pfxrouter *pfr;
 1360                         int j;
 1361 
 1362                         in6_embedscope(&prl->prefix[i].prefix,
 1363                             &pr->ndpr_prefix, NULL, NULL);
 1364                         prl->prefix[i].raflags = pr->ndpr_raf;
 1365                         prl->prefix[i].prefixlen = pr->ndpr_plen;
 1366                         prl->prefix[i].vltime = pr->ndpr_vltime;
 1367                         prl->prefix[i].pltime = pr->ndpr_pltime;
 1368                         prl->prefix[i].if_index = pr->ndpr_ifp->if_index;
 1369                         prl->prefix[i].expire = pr->ndpr_expire;
 1370 
 1371                         pfr = pr->ndpr_advrtrs.lh_first;
 1372                         j = 0;
 1373                         while (pfr) {
 1374                                 if (j < DRLSTSIZ) {
 1375 #define RTRADDR prl->prefix[i].advrtr[j]
 1376                                         RTRADDR = pfr->router->rtaddr;
 1377                                         if (IN6_IS_ADDR_LINKLOCAL(&RTRADDR)) {
 1378                                                 /* XXX: hack for KAME */
 1379                                                 RTRADDR.s6_addr16[1] = 0;
 1380                                         } else
 1381                                                 log(LOG_ERR,
 1382                                                     "a router(%s) advertises "
 1383                                                     "a prefix with "
 1384                                                     "non-link local address\n",
 1385                                                     ip6_sprintf(&RTRADDR));
 1386 #undef RTRADDR
 1387                                 }
 1388                                 j++;
 1389                                 pfr = pfr->pfr_next;
 1390                         }
 1391                         prl->prefix[i].advrtrs = j;
 1392                         prl->prefix[i].origin = PR_ORIG_RA;
 1393 
 1394                         i++;
 1395                         pr = pr->ndpr_next;
 1396                 }
 1397               {
 1398                 struct rr_prefix *rpp;
 1399 
 1400                 for (rpp = LIST_FIRST(&rr_prefix); rpp;
 1401                      rpp = LIST_NEXT(rpp, rp_entry)) {
 1402                         if (i >= PRLSTSIZ)
 1403                                 break;
 1404                         in6_embedscope(&prl->prefix[i].prefix,
 1405                             &pr->ndpr_prefix, NULL, NULL);
 1406                         prl->prefix[i].raflags = rpp->rp_raf;
 1407                         prl->prefix[i].prefixlen = rpp->rp_plen;
 1408                         prl->prefix[i].vltime = rpp->rp_vltime;
 1409                         prl->prefix[i].pltime = rpp->rp_pltime;
 1410                         prl->prefix[i].if_index = rpp->rp_ifp->if_index;
 1411                         prl->prefix[i].expire = rpp->rp_expire;
 1412                         prl->prefix[i].advrtrs = 0;
 1413                         prl->prefix[i].origin = rpp->rp_origin;
 1414                         i++;
 1415                 }
 1416               }
 1417                 mtx_unlock(&nd6_mtx);
 1418 
 1419                 break;
 1420         case OSIOCGIFINFO_IN6:
 1421                 /* XXX: old ndp(8) assumes a positive value for linkmtu. */
 1422                 bzero(&ndi->ndi, sizeof(ndi->ndi));
 1423                 ndi->ndi.linkmtu = ND_IFINFO(ifp)->linkmtu;
 1424                 ndi->ndi.maxmtu = ND_IFINFO(ifp)->maxmtu;
 1425                 ndi->ndi.basereachable = ND_IFINFO(ifp)->basereachable;
 1426                 ndi->ndi.reachable = ND_IFINFO(ifp)->reachable;
 1427                 ndi->ndi.retrans = ND_IFINFO(ifp)->retrans;
 1428                 ndi->ndi.flags = ND_IFINFO(ifp)->flags;
 1429                 ndi->ndi.recalctm = ND_IFINFO(ifp)->recalctm;
 1430                 ndi->ndi.chlim = ND_IFINFO(ifp)->chlim;
 1431                 ndi->ndi.receivedra = ND_IFINFO(ifp)->receivedra;
 1432                 break;
 1433         case SIOCGIFINFO_IN6:
 1434                 ndi->ndi = *ND_IFINFO(ifp);
 1435                 break;
 1436         case SIOCSIFINFO_FLAGS:
 1437                 ND_IFINFO(ifp)->flags = ndi->ndi.flags;
 1438                 break;
 1439         case SIOCSNDFLUSH_IN6:  /* XXX: the ioctl name is confusing... */
 1440                 /* flush default router list */
 1441                 /*
 1442                  * xxx sumikawa: should not delete route if default
 1443                  * route equals to the top of default router list
 1444                  */
 1445                 bzero(&any, sizeof(any));
 1446                 defrouter_delreq(&any, 0);
 1447                 defrouter_select();
 1448                 /* xxx sumikawa: flush prefix list */
 1449                 break;
 1450         case SIOCSPFXFLUSH_IN6:
 1451             {
 1452                 /* flush all the prefix advertised by routers */
 1453                 struct nd_prefix *pr, *next;
 1454 
 1455                 mtx_lock(&nd6_mtx);
 1456                 for (pr = nd_prefix.lh_first; pr; pr = next) {
 1457                         struct in6_ifaddr *ia, *ia_next;
 1458 
 1459                         next = pr->ndpr_next;
 1460 
 1461                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1462                                 continue; /* XXX */
 1463 
 1464                         /* do we really have to remove addresses as well? */
 1465                         for (ia = in6_ifaddr; ia; ia = ia_next) {
 1466                                 /* ia might be removed.  keep the next ptr. */
 1467                                 ia_next = ia->ia_next;
 1468 
 1469                                 if (!(ia->ia6_flags & IN6_IFF_AUTOCONF))
 1470                                         continue;
 1471 
 1472                                 if (ia->ia6_ndpr == pr)
 1473                                         in6_purgeaddr(&ia->ia_ifa);
 1474                         }
 1475                         prelist_remove(pr);
 1476                 }
 1477                 mtx_unlock(&nd6_mtx);
 1478                 break;
 1479             }
 1480         case SIOCSRTRFLUSH_IN6:
 1481             {
 1482                 /* flush all the default routers */
 1483                 struct nd_defrouter *dr, *next;
 1484 
 1485                 mtx_lock(&nd6_mtx);
 1486                 if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) {
 1487                         /*
 1488                          * The first entry of the list may be stored in
 1489                          * the routing table, so we'll delete it later.
 1490                          */
 1491                         for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = next) {
 1492                                 next = TAILQ_NEXT(dr, dr_entry);
 1493                                 defrtrlist_del(dr);
 1494                         }
 1495                         defrtrlist_del(TAILQ_FIRST(&nd_defrouter));
 1496                 }
 1497                 mtx_unlock(&nd6_mtx);
 1498                 break;
 1499             }
 1500         case SIOCGNBRINFO_IN6:
 1501             {
 1502                 struct llinfo_nd6 *ln;
 1503                 struct in6_addr nb_addr = nbi->addr; /* make local for safety */
 1504 
 1505                 /*
 1506                  * XXX: KAME specific hack for scoped addresses
 1507                  *      XXXX: for other scopes than link-local?
 1508                  */
 1509                 if (IN6_IS_ADDR_LINKLOCAL(&nbi->addr) ||
 1510                     IN6_IS_ADDR_MC_LINKLOCAL(&nbi->addr)) {
 1511                         u_int16_t *idp = (u_int16_t *)&nb_addr.s6_addr[2];
 1512 
 1513                         if (*idp == 0)
 1514                                 *idp = htons(ifp->if_index);
 1515                 }
 1516 
 1517                 mtx_lock(&nd6_mtx);
 1518                 if ((rt = nd6_lookup(&nb_addr, 0, ifp)) == NULL) {
 1519                         error = EINVAL;
 1520                         mtx_unlock(&nd6_mtx);
 1521                         break;
 1522                 }
 1523                 ln = (struct llinfo_nd6 *)rt->rt_llinfo;
 1524                 nbi->state = ln->ln_state;
 1525                 nbi->asked = ln->ln_asked;
 1526                 nbi->isrouter = ln->ln_router;
 1527                 nbi->expire = ln->ln_expire;
 1528                 mtx_unlock(&nd6_mtx);
 1529 
 1530                 break;
 1531             }
 1532         case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
 1533                 ndif->ifindex = nd6_defifindex;
 1534                 break;
 1535         case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
 1536                 return (nd6_setdefaultiface(ndif->ifindex));
 1537                 break;
 1538         }
 1539         return (error);
 1540 }
 1541 
 1542 /*
 1543  * Create neighbor cache entry and cache link-layer address,
 1544  * on reception of inbound ND6 packets. (RS/RA/NS/redirect)
 1545  */
 1546 struct rtentry *
 1547 nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr,
 1548                  int lladdrlen,
 1549                  int type,      /* ICMP6 type */
 1550                  int code       /* type dependent information */)
 1551 {
 1552         struct rtentry *rt = NULL;
 1553         struct llinfo_nd6 *ln = NULL;
 1554         int is_newentry;
 1555         struct sockaddr_dl *sdl = NULL;
 1556         int do_update;
 1557         int olladdr;
 1558         int llchange;
 1559         int newstate = 0;
 1560 
 1561         if (!ifp)
 1562                 panic("ifp == NULL in nd6_cache_lladdr");
 1563         if (!from)
 1564                 panic("from == NULL in nd6_cache_lladdr");
 1565 
 1566         /* nothing must be updated for unspecified address */
 1567         if (IN6_IS_ADDR_UNSPECIFIED(from))
 1568                 return NULL;
 1569 
 1570         /*
 1571          * Validation about ifp->if_addrlen and lladdrlen must be done in
 1572          * the caller.
 1573          *
 1574          * XXX If the link does not have link-layer adderss, what should
 1575          * we do? (ifp->if_addrlen == 0)
 1576          * Spec says nothing in sections for RA, RS and NA.  There's small
 1577          * description on it in NS section (RFC 2461 7.2.3).
 1578          */
 1579 
 1580         rt = nd6_lookup(from, 0, ifp);
 1581         if (!rt) {
 1582 #if 0
 1583                 /* nothing must be done if there's no lladdr */
 1584                 if (!lladdr || !lladdrlen)
 1585                         return NULL;
 1586 #endif
 1587 
 1588                 rt = nd6_lookup(from, 1, ifp);
 1589                 is_newentry = 1;
 1590         } else {
 1591                 /* do nothing if static ndp is set */
 1592                 if (rt->rt_flags & RTF_STATIC)
 1593                         return NULL;
 1594                 is_newentry = 0;
 1595         }
 1596 
 1597         if (!rt)
 1598                 return NULL;
 1599         if ((rt->rt_flags & (RTF_GATEWAY | RTF_LLINFO)) != RTF_LLINFO) {
 1600 fail:
 1601                 nd6_free(rt);
 1602                 return NULL;
 1603         }
 1604         ln = (struct llinfo_nd6 *)rt->rt_llinfo;
 1605         if (!ln)
 1606                 goto fail;
 1607         if (!rt->rt_gateway)
 1608                 goto fail;
 1609         if (rt->rt_gateway->sa_family != AF_LINK)
 1610                 goto fail;
 1611         sdl = SDL(rt->rt_gateway);
 1612 
 1613         olladdr = (sdl->sdl_alen) ? 1 : 0;
 1614         if (olladdr && lladdr) {
 1615                 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen))
 1616                         llchange = 1;
 1617                 else
 1618                         llchange = 0;
 1619         } else
 1620                 llchange = 0;
 1621 
 1622         /*
 1623          * newentry olladdr  lladdr  llchange   (*=record)
 1624          *      0       n       n       --      (1)
 1625          *      0       y       n       --      (2)
 1626          *      0       n       y       --      (3) * STALE
 1627          *      0       y       y       n       (4) *
 1628          *      0       y       y       y       (5) * STALE
 1629          *      1       --      n       --      (6)   NOSTATE(= PASSIVE)
 1630          *      1       --      y       --      (7) * STALE
 1631          */
 1632 
 1633         if (lladdr) {           /* (3-5) and (7) */
 1634                 /*
 1635                  * Record source link-layer address
 1636                  * XXX is it dependent to ifp->if_type?
 1637                  */
 1638                 sdl->sdl_alen = ifp->if_addrlen;
 1639                 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
 1640         }
 1641 
 1642         if (!is_newentry) {
 1643                 if ((!olladdr && lladdr)                /* (3) */
 1644                  || (olladdr && lladdr && llchange)) {  /* (5) */
 1645                         do_update = 1;
 1646                         newstate = ND6_LLINFO_STALE;
 1647                 } else                                  /* (1-2,4) */
 1648                         do_update = 0;
 1649         } else {
 1650                 do_update = 1;
 1651                 if (!lladdr)                            /* (6) */
 1652                         newstate = ND6_LLINFO_NOSTATE;
 1653                 else                                    /* (7) */
 1654                         newstate = ND6_LLINFO_STALE;
 1655         }
 1656 
 1657         if (do_update) {
 1658                 /*
 1659                  * Update the state of the neighbor cache.
 1660                  */
 1661                 ln->ln_state = newstate;
 1662 
 1663                 if (ln->ln_state == ND6_LLINFO_STALE) {
 1664                         /*
 1665                          * XXX: since nd6_output() below will cause
 1666                          * state tansition to DELAY and reset the timer,
 1667                          * we must set the timer now, although it is actually
 1668                          * meaningless.
 1669                          */
 1670                         ln->ln_expire = time_uptime + nd6_gctimer;
 1671 
 1672                         if (ln->ln_hold) {
 1673                                 /*
 1674                                  * we assume ifp is not a p2p here, so just
 1675                                  * set the 2nd argument as the 1st one.
 1676                                  */
 1677                                 nd6_output(ifp, ifp, ln->ln_hold,
 1678                                            (struct sockaddr_in6 *)rt_key(rt),
 1679                                            rt);
 1680                                 ln->ln_hold = NULL;
 1681                         }
 1682                 } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
 1683                         /* probe right away */
 1684                         ln->ln_expire = time_uptime;
 1685                 }
 1686         }
 1687 
 1688         /*
 1689          * ICMP6 type dependent behavior.
 1690          *
 1691          * NS: clear IsRouter if new entry
 1692          * RS: clear IsRouter
 1693          * RA: set IsRouter if there's lladdr
 1694          * redir: clear IsRouter if new entry
 1695          *
 1696          * RA case, (1):
 1697          * The spec says that we must set IsRouter in the following cases:
 1698          * - If lladdr exist, set IsRouter.  This means (1-5).
 1699          * - If it is old entry (!newentry), set IsRouter.  This means (7).
 1700          * So, based on the spec, in (1-5) and (7) cases we must set IsRouter.
 1701          * A quetion arises for (1) case.  (1) case has no lladdr in the
 1702          * neighbor cache, this is similar to (6).
 1703          * This case is rare but we figured that we MUST NOT set IsRouter.
 1704          *
 1705          * newentry olladdr  lladdr  llchange       NS  RS  RA  redir
 1706          *                                                      D R
 1707          *      0       n       n       --      (1)     c   ?     s
 1708          *      0       y       n       --      (2)     c   s     s
 1709          *      0       n       y       --      (3)     c   s     s
 1710          *      0       y       y       n       (4)     c   s     s
 1711          *      0       y       y       y       (5)     c   s     s
 1712          *      1       --      n       --      (6) c   c       c s
 1713          *      1       --      y       --      (7) c   c   s   c s
 1714          *
 1715          *                                      (c=clear s=set)
 1716          */
 1717         switch (type & 0xff) {
 1718         case ND_NEIGHBOR_SOLICIT:
 1719                 /*
 1720                  * New entry must have is_router flag cleared.
 1721                  */
 1722                 if (is_newentry)        /* (6-7) */
 1723                         ln->ln_router = 0;
 1724                 break;
 1725         case ND_REDIRECT:
 1726                 /*
 1727                  * If the icmp is a redirect to a better router, always set the
 1728                  * is_router flag. Otherwise, if the entry is newly created,
 1729                  * clear the flag. [RFC 2461, sec 8.3]
 1730                  */
 1731                 if (code == ND_REDIRECT_ROUTER)
 1732                         ln->ln_router = 1;
 1733                 else if (is_newentry) /* (6-7) */
 1734                         ln->ln_router = 0;
 1735                 break;
 1736         case ND_ROUTER_SOLICIT:
 1737                 /*
 1738                  * is_router flag must always be cleared.
 1739                  */
 1740                 ln->ln_router = 0;
 1741                 break;
 1742         case ND_ROUTER_ADVERT:
 1743                 /*
 1744                  * Mark an entry with lladdr as a router.
 1745                  */
 1746                 if ((!is_newentry && (olladdr || lladdr))       /* (2-5) */
 1747                  || (is_newentry && lladdr)) {                  /* (7) */
 1748                         ln->ln_router = 1;
 1749                 }
 1750                 break;
 1751         }
 1752 
 1753         /*
 1754          * When the link-layer address of a router changes, select the
 1755          * best router again.  In particular, when the neighbor entry is newly
 1756          * created, it might affect the selection policy.
 1757          * Question: can we restrict the first condition to the "is_newentry"
 1758          * case?
 1759          * XXX: when we hear an RA from a new router with the link-layer
 1760          * address option, defrouter_select() is called twice, since
 1761          * defrtrlist_update called the function as well.  However, I believe
 1762          * we can compromise the overhead, since it only happens the first
 1763          * time.
 1764          * XXX: although defrouter_select() should not have a bad effect
 1765          * for those are not autoconfigured hosts, we explicitly avoid such
 1766          * cases for safety.
 1767          */
 1768         if (do_update && ln->ln_router && !ip6_forwarding && ip6_accept_rtadv)
 1769                 defrouter_select();
 1770 
 1771         return rt;
 1772 }
 1773 
 1774 static void
 1775 nd6_slowtimo(void *ignored_arg)
 1776 {
 1777         struct nd_ifinfo *nd6if;
 1778         struct ifnet *ifp;
 1779 
 1780         mtx_lock(&nd6_mtx);
 1781         callout_reset(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
 1782                         nd6_slowtimo, NULL);
 1783         for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
 1784                 if (ifp->if_afdata[AF_INET6] == NULL)
 1785                         continue;
 1786                 nd6if = ND_IFINFO(ifp);
 1787                 if (nd6if->basereachable && /* already initialized */
 1788                     (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) {
 1789                         /*
 1790                          * Since reachable time rarely changes by router
 1791                          * advertisements, we SHOULD insure that a new random
 1792                          * value gets recomputed at least once every few hours.
 1793                          * (RFC 2461, 6.3.4)
 1794                          */
 1795                         nd6if->recalctm = nd6_recalc_reachtm_interval;
 1796                         nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable);
 1797                 }
 1798         }
 1799         mtx_unlock(&nd6_mtx);
 1800 }
 1801 
 1802 #define gotoerr(e) { error = (e); goto bad;}
 1803 
 1804 int
 1805 nd6_output(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m,
 1806            struct sockaddr_in6 *dst, struct rtentry *rt)
 1807 {
 1808         struct llinfo_nd6 *ln = NULL;
 1809         int error = 0;
 1810 
 1811         if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr))
 1812                 goto sendpkt;
 1813 
 1814         if (nd6_need_cache(ifp) == 0)
 1815                 goto sendpkt;
 1816 
 1817         /*
 1818          * next hop determination.  This routine is derived from ether_outpout.
 1819          */
 1820         if (rt != NULL) {
 1821                 if (!(rt->rt_flags & RTF_UP)) {
 1822                         rt = rtlookup((struct sockaddr *)dst);
 1823                         if (rt == NULL)
 1824                                 gotoerr(EHOSTUNREACH);
 1825                         rt->rt_refcnt--;
 1826                         if (rt->rt_ifp != ifp) {
 1827                                 /* XXX: loop care? */
 1828                                 return nd6_output(ifp, origifp, m, dst, rt);
 1829                         }
 1830                 }
 1831                 if (rt->rt_flags & RTF_GATEWAY) {
 1832                         struct sockaddr_in6 *gw6;
 1833 
 1834                         /*
 1835                          * We skip link-layer address resolution and NUD
 1836                          * if the gateway is not a neighbor from ND point
 1837                          * of view, regardless of the value of nd_ifinfo.flags.
 1838                          * The second condition is a bit tricky; we skip
 1839                          * if the gateway is our own address, which is
 1840                          * sometimes used to install a route to a p2p link.
 1841                          */
 1842                         gw6 = (struct sockaddr_in6 *)rt->rt_gateway;
 1843                         if (!nd6_is_addr_neighbor(gw6, ifp) ||
 1844                             in6ifa_ifpwithaddr(ifp, &gw6->sin6_addr)) {
 1845                                 /*
 1846                                  * We allow this kind of tricky route only
 1847                                  * when the outgoing interface is p2p.
 1848                                  * XXX: we may need a more generic rule here.
 1849                                  */
 1850                                 if (!(ifp->if_flags & IFF_POINTOPOINT))
 1851                                         gotoerr(EHOSTUNREACH);
 1852 
 1853                                 goto sendpkt;
 1854                         }
 1855 
 1856                         if (rt->rt_gwroute == NULL) {
 1857                                 rt->rt_gwroute = rtlookup(rt->rt_gateway);
 1858                                 if (rt->rt_gwroute == NULL)
 1859                                         gotoerr(EHOSTUNREACH);
 1860                         } else if (!(rt->rt_gwroute->rt_flags & RTF_UP)) {
 1861                                 rtfree(rt->rt_gwroute);
 1862                                 rt->rt_gwroute = rtlookup(rt->rt_gateway);
 1863                                 if (rt->rt_gwroute == NULL)
 1864                                         gotoerr(EHOSTUNREACH);
 1865                         }
 1866                 }
 1867         }
 1868 
 1869         /*
 1870          * Address resolution or Neighbor Unreachability Detection
 1871          * for the next hop.
 1872          * At this point, the destination of the packet must be a unicast
 1873          * or an anycast address(i.e. not a multicast).
 1874          */
 1875 
 1876         /* Look up the neighbor cache for the nexthop */
 1877         if (rt && (rt->rt_flags & RTF_LLINFO))
 1878                 ln = (struct llinfo_nd6 *)rt->rt_llinfo;
 1879         else {
 1880                 /*
 1881                  * Since nd6_is_addr_neighbor() internally calls nd6_lookup(),
 1882                  * the condition below is not very efficient.  But we believe
 1883                  * it is tolerable, because this should be a rare case.
 1884                  */
 1885                 if (nd6_is_addr_neighbor(dst, ifp) &&
 1886                     (rt = nd6_lookup(&dst->sin6_addr, 1, ifp)) != NULL)
 1887                         ln = (struct llinfo_nd6 *)rt->rt_llinfo;
 1888         }
 1889         if (!ln || !rt) {
 1890                 if (!(ifp->if_flags & IFF_POINTOPOINT) &&
 1891                     !(ND_IFINFO(ifp)->flags & ND6_IFF_PERFORMNUD)) {
 1892                         log(LOG_DEBUG,
 1893                             "nd6_output: can't allocate llinfo for %s "
 1894                             "(ln=%p, rt=%p)\n",
 1895                             ip6_sprintf(&dst->sin6_addr), ln, rt);
 1896                         gotoerr(EIO);   /* XXX: good error? */
 1897                 }
 1898 
 1899                 goto sendpkt;   /* send anyway */
 1900         }
 1901 
 1902         /* We don't have to do link-layer address resolution on a p2p link. */
 1903         if ((ifp->if_flags & IFF_POINTOPOINT) &&
 1904             ln->ln_state < ND6_LLINFO_REACHABLE) {
 1905                 ln->ln_state = ND6_LLINFO_STALE;
 1906                 ln->ln_expire = time_uptime + nd6_gctimer;
 1907         }
 1908 
 1909         /*
 1910          * The first time we send a packet to a neighbor whose entry is
 1911          * STALE, we have to change the state to DELAY and a sets a timer to
 1912          * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do
 1913          * neighbor unreachability detection on expiration.
 1914          * (RFC 2461 7.3.3)
 1915          */
 1916         if (ln->ln_state == ND6_LLINFO_STALE) {
 1917                 ln->ln_asked = 0;
 1918                 ln->ln_state = ND6_LLINFO_DELAY;
 1919                 ln->ln_expire = time_uptime + nd6_delay;
 1920         }
 1921 
 1922         /*
 1923          * If the neighbor cache entry has a state other than INCOMPLETE
 1924          * (i.e. its link-layer address is already resolved), just
 1925          * send the packet.
 1926          */
 1927         if (ln->ln_state > ND6_LLINFO_INCOMPLETE)
 1928                 goto sendpkt;
 1929 
 1930         /*
 1931          * There is a neighbor cache entry, but no ethernet address
 1932          * response yet.  Replace the held mbuf (if any) with this
 1933          * latest one.
 1934          *
 1935          * This code conforms to the rate-limiting rule described in Section
 1936          * 7.2.2 of RFC 2461, because the timer is set correctly after sending
 1937          * an NS below.
 1938          */
 1939         if (ln->ln_state == ND6_LLINFO_NOSTATE)
 1940                 ln->ln_state = ND6_LLINFO_INCOMPLETE;
 1941         if (ln->ln_hold)
 1942                 m_freem(ln->ln_hold);
 1943         ln->ln_hold = m;
 1944         if (ln->ln_expire) {
 1945                 if (ln->ln_asked < nd6_mmaxtries &&
 1946                     ln->ln_expire < time_uptime) {
 1947                         ln->ln_asked++;
 1948                         ln->ln_expire = time_uptime +
 1949                                 ND_IFINFO(ifp)->retrans / 1000;
 1950                         nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0);
 1951                 }
 1952         }
 1953         return (0);
 1954 
 1955 sendpkt:
 1956         if (ifp->if_flags & IFF_LOOPBACK)
 1957                 error = ifp->if_output(origifp, m, (struct sockaddr *)dst, rt);
 1958         else
 1959                 error = ifp->if_output(ifp, m, (struct sockaddr *)dst, rt);
 1960         return (error);
 1961 
 1962 bad:
 1963         m_freem(m);
 1964         return (error);
 1965 }
 1966 #undef gotoerr
 1967 
 1968 int
 1969 nd6_need_cache(struct ifnet *ifp)
 1970 {
 1971         /*
 1972          * XXX: we currently do not make neighbor cache on any interface
 1973          * other than Ethernet and GIF.
 1974          *
 1975          * RFC2893 says:
 1976          * - unidirectional tunnels needs no ND
 1977          */
 1978         switch (ifp->if_type) {
 1979         case IFT_ETHER:
 1980         case IFT_IEEE1394:
 1981 #ifdef IFT_L2VLAN
 1982         case IFT_L2VLAN:
 1983 #endif
 1984 #ifdef IFT_IEEE80211
 1985         case IFT_IEEE80211:
 1986 #endif
 1987 #ifdef IFT_CARP
 1988         case IFT_CARP:
 1989 #endif
 1990         case IFT_GIF:           /* XXX need more cases? */
 1991                 return (1);
 1992         default:
 1993                 return (0);
 1994         }
 1995 }
 1996 
 1997 int
 1998 nd6_storelladdr(struct ifnet *ifp, struct rtentry *rt0, struct mbuf *m,
 1999                 struct sockaddr *dst, u_char *desten)
 2000 {
 2001         struct sockaddr_dl *sdl;
 2002         struct rtentry *rt;
 2003 
 2004 
 2005         if (m->m_flags & M_MCAST) {
 2006                 switch (ifp->if_type) {
 2007                 case IFT_ETHER:
 2008 #ifdef IFT_L2VLAN
 2009         case IFT_L2VLAN:
 2010 #endif
 2011 #ifdef IFT_IEEE80211
 2012                 case IFT_IEEE80211:
 2013 #endif
 2014                         ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr,
 2015                                                  desten);
 2016                         return (1);
 2017                 case IFT_IEEE1394:
 2018                         bcopy(ifp->if_broadcastaddr, desten, ifp->if_addrlen);
 2019                         return (1);
 2020                 default:
 2021                         m_freem(m);
 2022                         return (0);
 2023                 }
 2024         }
 2025         if (rt0 == NULL) {
 2026                 /* this could happen, if we could not allocate memory */
 2027                 m_freem(m);
 2028                 return (0);
 2029         }
 2030         if (rt_llroute(dst, rt0, &rt) != 0) {
 2031                 m_freem(m);
 2032                 return (0);
 2033         }
 2034         if (rt->rt_gateway->sa_family != AF_LINK) {
 2035                 kprintf("nd6_storelladdr: something odd happens\n");
 2036                 m_freem(m);
 2037                 return (0);
 2038         }
 2039         sdl = SDL(rt->rt_gateway);
 2040         if (sdl->sdl_alen == 0) {
 2041                 /* this should be impossible, but we bark here for debugging */
 2042                 kprintf("nd6_storelladdr: sdl_alen == 0\n");
 2043                 m_freem(m);
 2044                 return (0);
 2045         }
 2046 
 2047         bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
 2048         return (1);
 2049 }
 2050 
 2051 static int nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS);
 2052 static int nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS);
 2053 #ifdef SYSCTL_DECL
 2054 SYSCTL_DECL(_net_inet6_icmp6);
 2055 #endif
 2056 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
 2057         CTLFLAG_RD, nd6_sysctl_drlist, "List default routers");
 2058 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist,
 2059         CTLFLAG_RD, nd6_sysctl_prlist, "List prefixes");
 2060 
 2061 static int
 2062 nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)
 2063 {
 2064         int error;
 2065         char buf[1024];
 2066         struct in6_defrouter *d, *de;
 2067         struct nd_defrouter *dr;
 2068 
 2069         if (req->newptr)
 2070                 return EPERM;
 2071         error = 0;
 2072 
 2073         for (dr = TAILQ_FIRST(&nd_defrouter);
 2074              dr;
 2075              dr = TAILQ_NEXT(dr, dr_entry)) {
 2076                 d = (struct in6_defrouter *)buf;
 2077                 de = (struct in6_defrouter *)(buf + sizeof(buf));
 2078 
 2079                 if (d + 1 <= de) {
 2080                         bzero(d, sizeof(*d));
 2081                         d->rtaddr.sin6_family = AF_INET6;
 2082                         d->rtaddr.sin6_len = sizeof(d->rtaddr);
 2083                         if (in6_recoverscope(&d->rtaddr, &dr->rtaddr,
 2084                             dr->ifp) != 0)
 2085                                 log(LOG_ERR,
 2086                                     "scope error in "
 2087                                     "default router list (%s)\n",
 2088                                     ip6_sprintf(&dr->rtaddr));
 2089                         d->flags = dr->flags;
 2090                         d->rtlifetime = dr->rtlifetime;
 2091                         d->expire = dr->expire;
 2092                         d->if_index = dr->ifp->if_index;
 2093                 } else
 2094                         panic("buffer too short");
 2095 
 2096                 error = SYSCTL_OUT(req, buf, sizeof(*d));
 2097                 if (error)
 2098                         break;
 2099         }
 2100         return error;
 2101 }
 2102 
 2103 static int
 2104 nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS)
 2105 {
 2106         int error;
 2107         char buf[1024];
 2108         struct in6_prefix *p, *pe;
 2109         struct nd_prefix *pr;
 2110 
 2111         if (req->newptr)
 2112                 return EPERM;
 2113         error = 0;
 2114 
 2115         for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 2116                 u_short advrtrs;
 2117                 size_t advance;
 2118                 struct sockaddr_in6 *sin6, *s6;
 2119                 struct nd_pfxrouter *pfr;
 2120 
 2121                 p = (struct in6_prefix *)buf;
 2122                 pe = (struct in6_prefix *)(buf + sizeof(buf));
 2123 
 2124                 if (p + 1 <= pe) {
 2125                         bzero(p, sizeof(*p));
 2126                         sin6 = (struct sockaddr_in6 *)(p + 1);
 2127 
 2128                         p->prefix = pr->ndpr_prefix;
 2129                         if (in6_recoverscope(&p->prefix,
 2130                             &p->prefix.sin6_addr, pr->ndpr_ifp) != 0)
 2131                                 log(LOG_ERR,
 2132                                     "scope error in prefix list (%s)\n",
 2133                                     ip6_sprintf(&p->prefix.sin6_addr));
 2134                         p->raflags = pr->ndpr_raf;
 2135                         p->prefixlen = pr->ndpr_plen;
 2136                         p->vltime = pr->ndpr_vltime;
 2137                         p->pltime = pr->ndpr_pltime;
 2138                         p->if_index = pr->ndpr_ifp->if_index;
 2139                         p->expire = pr->ndpr_expire;
 2140                         p->refcnt = pr->ndpr_refcnt;
 2141                         p->flags = pr->ndpr_stateflags;
 2142                         p->origin = PR_ORIG_RA;
 2143                         advrtrs = 0;
 2144                         for (pfr = pr->ndpr_advrtrs.lh_first;
 2145                              pfr;
 2146                              pfr = pfr->pfr_next) {
 2147                                 if ((void *)&sin6[advrtrs + 1] >
 2148                                     (void *)pe) {
 2149                                         advrtrs++;
 2150                                         continue;
 2151                                 }
 2152                                 s6 = &sin6[advrtrs];
 2153                                 bzero(s6, sizeof(*s6));
 2154                                 s6->sin6_family = AF_INET6;
 2155                                 s6->sin6_len = sizeof(*sin6);
 2156                                 if (in6_recoverscope(s6, &pfr->router->rtaddr,
 2157                                                      pfr->router->ifp) != 0)
 2158                                         log(LOG_ERR,
 2159                                             "scope error in "
 2160                                             "prefix list (%s)\n",
 2161                                             ip6_sprintf(&pfr->router->rtaddr));
 2162                                 advrtrs++;
 2163                         }
 2164                         p->advrtrs = advrtrs;
 2165                 } else
 2166                         panic("buffer too short");
 2167 
 2168                 advance = sizeof(*p) + sizeof(*sin6) * advrtrs;
 2169                 error = SYSCTL_OUT(req, buf, advance);
 2170                 if (error)
 2171                         break;
 2172         }
 2173         return error;
 2174 }

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