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

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    1 /*      $FreeBSD: src/sys/netinet6/nd6.c,v 1.20 2002/08/02 20:49:14 rwatson 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 <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/malloc.h>
   44 #include <sys/mbuf.h>
   45 #include <sys/socket.h>
   46 #include <sys/sockio.h>
   47 #include <sys/time.h>
   48 #include <sys/kernel.h>
   49 #include <sys/errno.h>
   50 #include <sys/syslog.h>
   51 #include <sys/protosw.h>
   52 #include <kern/queue.h>
   53 
   54 #define DONT_WARN_OBSOLETE
   55 #include <net/if.h>
   56 #include <net/if_dl.h>
   57 #include <net/if_types.h>
   58 #include <net/if_atm.h>
   59 #include <net/route.h>
   60 #include <net/dlil.h>
   61 
   62 #include <netinet/in.h>
   63 #include <netinet/if_ether.h>
   64 #include <netinet/if_fddi.h>
   65 #include <netinet6/in6_var.h>
   66 #include <netinet/ip6.h>
   67 #include <netinet6/ip6_var.h>
   68 #include <netinet6/nd6.h>
   69 #include <netinet6/in6_prefix.h>
   70 #include <netinet/icmp6.h>
   71 
   72 #include "loop.h"
   73 
   74 #include <net/net_osdep.h>
   75 
   76 #define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */
   77 #define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */
   78 
   79 #define SIN6(s) ((struct sockaddr_in6 *)s)
   80 #define SDL(s) ((struct sockaddr_dl *)s)
   81 
   82 /* timer values */
   83 int     nd6_prune       = 1;    /* walk list every 1 seconds */
   84 int     nd6_delay       = 5;    /* delay first probe time 5 second */
   85 int     nd6_umaxtries   = 3;    /* maximum unicast query */
   86 int     nd6_mmaxtries   = 3;    /* maximum multicast query */
   87 int     nd6_useloopback = 1;    /* use loopback interface for local traffic */
   88 int     nd6_gctimer     = (60 * 60 * 24); /* 1 day: garbage collection timer */
   89 
   90 /* preventing too many loops in ND option parsing */
   91 int nd6_maxndopt = 10;  /* max # of ND options allowed */
   92 
   93 int nd6_maxnudhint = 0; /* max # of subsequent upper layer hints */
   94 
   95 #if ND6_DEBUG
   96 int nd6_debug = 1;
   97 #else
   98 int nd6_debug = 0;
   99 #endif
  100 
  101 /* for debugging? */
  102 static int nd6_inuse, nd6_allocated;
  103 
  104 struct llinfo_nd6 llinfo_nd6 = {&llinfo_nd6, &llinfo_nd6};
  105 static size_t nd_ifinfo_indexlim = 8;
  106 struct nd_ifinfo *nd_ifinfo = NULL;
  107 struct nd_drhead nd_defrouter;
  108 struct nd_prhead nd_prefix = { 0 };
  109 
  110 int nd6_recalc_reachtm_interval = ND6_RECALC_REACHTM_INTERVAL;
  111 static struct sockaddr_in6 all1_sa;
  112 
  113 static void nd6_slowtimo_funneled __P((void *));
  114 static int regen_tmpaddr __P((struct in6_ifaddr *));
  115 
  116 
  117 void
  118 nd6_init()
  119 {
  120         static int nd6_init_done = 0;
  121         int i;
  122 
  123         if (nd6_init_done) {
  124                 log(LOG_NOTICE, "nd6_init called more than once(ignored)\n");
  125                 return;
  126         }
  127 
  128         all1_sa.sin6_family = AF_INET6;
  129         all1_sa.sin6_len = sizeof(struct sockaddr_in6);
  130         for (i = 0; i < sizeof(all1_sa.sin6_addr); i++)
  131                 all1_sa.sin6_addr.s6_addr[i] = 0xff;
  132 
  133         /* initialization of the default router list */
  134         TAILQ_INIT(&nd_defrouter);
  135 
  136         nd6_init_done = 1;
  137 
  138         /* start timer */
  139         timeout(nd6_slowtimo_funneled, (caddr_t)0, ND6_SLOWTIMER_INTERVAL * hz);
  140 }
  141 
  142 void
  143 nd6_ifattach(ifp)
  144         struct ifnet *ifp;
  145 {
  146 
  147         /*
  148          * We have some arrays that should be indexed by if_index.
  149          * since if_index will grow dynamically, they should grow too.
  150          */
  151         if (nd_ifinfo == NULL || if_index >= nd_ifinfo_indexlim) {
  152                 size_t n;
  153                 caddr_t q;
  154 
  155                 while (if_index >= nd_ifinfo_indexlim)
  156                         nd_ifinfo_indexlim <<= 1;
  157 
  158                 /* grow nd_ifinfo */
  159                 n = nd_ifinfo_indexlim * sizeof(struct nd_ifinfo);
  160                 q = (caddr_t)_MALLOC(n, M_IP6NDP, M_WAITOK);
  161                 bzero(q, n);
  162                 if (nd_ifinfo) {
  163                         bcopy((caddr_t)nd_ifinfo, q, n/2);
  164                         FREE((caddr_t)nd_ifinfo, M_IP6NDP);
  165                 }
  166                 nd_ifinfo = (struct nd_ifinfo *)q;
  167         }
  168 
  169 #define ND nd_ifinfo[ifp->if_index]
  170 
  171         /*
  172          * Don't initialize if called twice.
  173          * XXX: to detect this, we should choose a member that is never set
  174          * before initialization of the ND structure itself.  We formaly used
  175          * the linkmtu member, which was not suitable because it could be 
  176          * initialized via "ifconfig mtu".
  177          */
  178         if (ND.basereachable)
  179                 return;
  180 
  181         ND.linkmtu = ifindex2ifnet[ifp->if_index]->if_mtu;
  182         ND.chlim = IPV6_DEFHLIM;
  183         ND.basereachable = REACHABLE_TIME;
  184         ND.reachable = ND_COMPUTE_RTIME(ND.basereachable);
  185         ND.retrans = RETRANS_TIMER;
  186         ND.receivedra = 0;
  187         ND.flags = ND6_IFF_PERFORMNUD;
  188         nd6_setmtu(ifp);
  189 #undef ND
  190 }
  191 
  192 /*
  193  * Reset ND level link MTU. This function is called when the physical MTU
  194  * changes, which means we might have to adjust the ND level MTU.
  195  */
  196 void
  197 nd6_setmtu(ifp)
  198         struct ifnet *ifp;
  199 {
  200 #ifndef MIN
  201 #define MIN(a,b) ((a) < (b) ? (a) : (b))
  202 #endif
  203  
  204         struct nd_ifinfo *ndi;
  205         u_long oldmaxmtu, oldlinkmtu, dl_tag;
  206 
  207         /*
  208          * Make sure IPv6 is enabled for the interface first, 
  209          * because this can be called directly from SIOCSIFMTU for IPv4
  210          */
  211 
  212         if (ifp->if_index >= nd_ifinfo_indexlim) {
  213                 if (dlil_find_dltag(ifp->if_family, ifp->if_unit, PF_INET6, &dl_tag) != EPROTONOSUPPORT)  
  214                         nd6log((LOG_INFO, "setmtu for ifp=% but nd6 is not attached\n", if_name(ifp)));
  215                 return; /* we're  out of bound for nd_ifinfo */
  216         }
  217 
  218         ndi = &nd_ifinfo[ifp->if_index];
  219         oldmaxmtu = ndi->maxmtu;
  220         oldlinkmtu = ndi->linkmtu;
  221 
  222         switch (ifp->if_type) {
  223         case IFT_ARCNET:        /* XXX MTU handling needs more work */
  224                 ndi->maxmtu = MIN(60480, ifp->if_mtu);
  225                 break;
  226         case IFT_ETHER:
  227                 ndi->maxmtu = MIN(ETHERMTU, ifp->if_mtu);
  228                 break;
  229         case IFT_FDDI:
  230                 ndi->maxmtu = MIN(FDDIIPMTU, ifp->if_mtu);
  231                 break;
  232         case IFT_ATM:
  233                 ndi->maxmtu = MIN(ATMMTU, ifp->if_mtu);
  234                 break;
  235         case IFT_IEEE1394:      /* XXX should be IEEE1394MTU(1500) */
  236                 ndi->maxmtu = MIN(ETHERMTU, ifp->if_mtu);
  237                 break;
  238 #if IFT_IEEE80211
  239         case IFT_IEEE80211:     /* XXX should be IEEE80211MTU(1500) */
  240                 ndi->maxmtu = MIN(ETHERMTU, ifp->if_mtu);
  241                 break;
  242 #endif
  243         default:
  244                 ndi->maxmtu = ifp->if_mtu;
  245                 break;
  246         }
  247 
  248         if (oldmaxmtu != ndi->maxmtu) {
  249                 /*
  250                  * If the ND level MTU is not set yet, or if the maxmtu
  251                  * is reset to a smaller value than the ND level MTU,
  252                  * also reset the ND level MTU.
  253                  */
  254                 if (ndi->linkmtu == 0 ||
  255                     ndi->maxmtu < ndi->linkmtu) {
  256                         ndi->linkmtu = ndi->maxmtu;
  257                         /* also adjust in6_maxmtu if necessary. */
  258                         if (oldlinkmtu == 0) {
  259                                 /*
  260                                  * XXX: the case analysis is grotty, but
  261                                  * it is not efficient to call in6_setmaxmtu()
  262                                  * here when we are during the initialization
  263                                  * procedure.
  264                                  */
  265                                 if (in6_maxmtu < ndi->linkmtu)
  266                                         in6_maxmtu = ndi->linkmtu;
  267                         } else
  268                                 in6_setmaxmtu();
  269                 }
  270         }
  271 #undef MIN
  272 }
  273 
  274 void
  275 nd6_option_init(opt, icmp6len, ndopts)
  276         void *opt;
  277         int icmp6len;
  278         union nd_opts *ndopts;
  279 {
  280         bzero(ndopts, sizeof(*ndopts));
  281         ndopts->nd_opts_search = (struct nd_opt_hdr *)opt;
  282         ndopts->nd_opts_last
  283                 = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len);
  284 
  285         if (icmp6len == 0) {
  286                 ndopts->nd_opts_done = 1;
  287                 ndopts->nd_opts_search = NULL;
  288         }
  289 }
  290 
  291 /*
  292  * Take one ND option.
  293  */
  294 struct nd_opt_hdr *
  295 nd6_option(ndopts)
  296         union nd_opts *ndopts;
  297 {
  298         struct nd_opt_hdr *nd_opt;
  299         int olen;
  300 
  301         if (!ndopts)
  302                 panic("ndopts == NULL in nd6_option\n");
  303         if (!ndopts->nd_opts_last)
  304                 panic("uninitialized ndopts in nd6_option\n");
  305         if (!ndopts->nd_opts_search)
  306                 return NULL;
  307         if (ndopts->nd_opts_done)
  308                 return NULL;
  309 
  310         nd_opt = ndopts->nd_opts_search;
  311 
  312         /* make sure nd_opt_len is inside the buffer */
  313         if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) {
  314                 bzero(ndopts, sizeof(*ndopts));
  315                 return NULL;
  316         }
  317 
  318         olen = nd_opt->nd_opt_len << 3;
  319         if (olen == 0) {
  320                 /*
  321                  * Message validation requires that all included
  322                  * options have a length that is greater than zero.
  323                  */
  324                 bzero(ndopts, sizeof(*ndopts));
  325                 return NULL;
  326         }
  327 
  328         ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen);
  329         if (ndopts->nd_opts_search > ndopts->nd_opts_last) {
  330                 /* option overruns the end of buffer, invalid */
  331                 bzero(ndopts, sizeof(*ndopts));
  332                 return NULL;
  333         } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) {
  334                 /* reached the end of options chain */
  335                 ndopts->nd_opts_done = 1;
  336                 ndopts->nd_opts_search = NULL;
  337         }
  338         return nd_opt;
  339 }
  340 
  341 /*
  342  * Parse multiple ND options.
  343  * This function is much easier to use, for ND routines that do not need
  344  * multiple options of the same type.
  345  */
  346 int
  347 nd6_options(ndopts)
  348         union nd_opts *ndopts;
  349 {
  350         struct nd_opt_hdr *nd_opt;
  351         int i = 0;
  352 
  353         if (!ndopts)
  354                 panic("ndopts == NULL in nd6_options\n");
  355         if (!ndopts->nd_opts_last)
  356                 panic("uninitialized ndopts in nd6_options\n");
  357         if (!ndopts->nd_opts_search)
  358                 return 0;
  359 
  360         while (1) {
  361                 nd_opt = nd6_option(ndopts);
  362                 if (!nd_opt && !ndopts->nd_opts_last) {
  363                         /*
  364                          * Message validation requires that all included
  365                          * options have a length that is greater than zero.
  366                          */
  367                         icmp6stat.icp6s_nd_badopt++;
  368                         bzero(ndopts, sizeof(*ndopts));
  369                         return -1;
  370                 }
  371 
  372                 if (!nd_opt)
  373                         goto skip1;
  374 
  375                 switch (nd_opt->nd_opt_type) {
  376                 case ND_OPT_SOURCE_LINKADDR:
  377                 case ND_OPT_TARGET_LINKADDR:
  378                 case ND_OPT_MTU:
  379                 case ND_OPT_REDIRECTED_HEADER:
  380                         if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
  381                                 nd6log((LOG_INFO,
  382                                     "duplicated ND6 option found (type=%d)\n",
  383                                     nd_opt->nd_opt_type));
  384                                 /* XXX bark? */
  385                         } else {
  386                                 ndopts->nd_opt_array[nd_opt->nd_opt_type]
  387                                         = nd_opt;
  388                         }
  389                         break;
  390                 case ND_OPT_PREFIX_INFORMATION:
  391                         if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) {
  392                                 ndopts->nd_opt_array[nd_opt->nd_opt_type]
  393                                         = nd_opt;
  394                         }
  395                         ndopts->nd_opts_pi_end =
  396                                 (struct nd_opt_prefix_info *)nd_opt;
  397                         break;
  398                 default:
  399                         /*
  400                          * Unknown options must be silently ignored,
  401                          * to accomodate future extension to the protocol.
  402                          */
  403                         nd6log((LOG_DEBUG,
  404                             "nd6_options: unsupported option %d - "
  405                             "option ignored\n", nd_opt->nd_opt_type));
  406                 }
  407 
  408 skip1:
  409                 i++;
  410                 if (i > nd6_maxndopt) {
  411                         icmp6stat.icp6s_nd_toomanyopt++;
  412                         nd6log((LOG_INFO, "too many loop in nd opt\n"));
  413                         break;
  414                 }
  415 
  416                 if (ndopts->nd_opts_done)
  417                         break;
  418         }
  419 
  420         return 0;
  421 }
  422 
  423 /*
  424  * ND6 timer routine to expire default route list and prefix list
  425  */
  426 void
  427 nd6_timer_funneled(ignored_arg)
  428         void    *ignored_arg;
  429 {
  430 #ifdef __APPLE__
  431         boolean_t   funnel_state;
  432         funnel_state = thread_funnel_set(network_flock, TRUE);
  433 #endif
  434         nd6_timer(ignored_arg);
  435 #ifdef __APPLE__
  436         (void) thread_funnel_set(network_flock, FALSE);
  437 #endif
  438 }
  439 void
  440 nd6_timer(ignored_arg)
  441         void    *ignored_arg;
  442 {
  443         int s;
  444         struct llinfo_nd6 *ln;
  445         struct nd_defrouter *dr;
  446         struct nd_prefix *pr;
  447         struct ifnet *ifp;
  448         struct in6_ifaddr *ia6, *nia6;
  449         struct in6_addrlifetime *lt6;
  450         
  451         s = splnet();
  452 
  453         timeout(nd6_timer_funneled, (caddr_t)0, nd6_prune * hz);
  454 
  455         ln = llinfo_nd6.ln_next;
  456         while (ln && ln != &llinfo_nd6) {
  457                 struct rtentry *rt;
  458                 struct sockaddr_in6 *dst;
  459                 struct llinfo_nd6 *next = ln->ln_next;
  460                 /* XXX: used for the DELAY case only: */
  461                 struct nd_ifinfo *ndi = NULL;
  462 
  463                 if ((rt = ln->ln_rt) == NULL) {
  464                         ln = next;
  465                         continue;
  466                 }
  467                 if ((ifp = rt->rt_ifp) == NULL) {
  468                         ln = next;
  469                         continue;
  470                 }
  471                 ndi = &nd_ifinfo[ifp->if_index];
  472                 dst = (struct sockaddr_in6 *)rt_key(rt);
  473 
  474                 if (ln->ln_expire > time_second) {
  475                         ln = next;
  476                         continue;
  477                 }
  478 
  479                 /* sanity check */
  480                 if (!rt) {
  481                         printf("rt=0 in nd6_timer(ln=%p)\n", ln);
  482                         ln = next;
  483                         continue;
  484                 }
  485                 if (rt->rt_llinfo && (struct llinfo_nd6 *)rt->rt_llinfo != ln) {
  486                         printf("rt_llinfo(%p) is not equal to ln(%p)\n",
  487                               rt->rt_llinfo, ln);
  488                         ln = next;
  489                         continue;       
  490                 }
  491                 if (!dst) {
  492                         printf("dst=0 in nd6_timer(ln=%p)\n", ln);
  493                         ln = next;
  494                         continue;
  495                 }
  496 
  497                 switch (ln->ln_state) {
  498                 case ND6_LLINFO_INCOMPLETE:
  499                         if (ln->ln_asked < nd6_mmaxtries) {
  500                                 ln->ln_asked++;
  501                                 ln->ln_expire = time_second +
  502                                         nd_ifinfo[ifp->if_index].retrans / 1000;
  503                                 nd6_ns_output(ifp, NULL, &dst->sin6_addr,
  504                                         ln, 0);
  505                         } else {
  506                                 struct mbuf *m = ln->ln_hold;
  507                                 ln->ln_hold = NULL;
  508                                 if (m) {
  509                                         if (rt->rt_ifp) {
  510                                                 /*
  511                                                  * Fake rcvif to make ICMP error
  512                                                  * more helpful in diagnosing
  513                                                  * for the receiver.
  514                                                  * XXX: should we consider
  515                                                  * older rcvif?
  516                                                  */
  517                                                 m->m_pkthdr.rcvif = rt->rt_ifp;
  518                                         }
  519                                         icmp6_error(m, ICMP6_DST_UNREACH,
  520                                                     ICMP6_DST_UNREACH_ADDR, 0);
  521                                         ln->ln_hold = NULL;
  522                                 }
  523                                 next = nd6_free(rt);
  524                         }
  525                         break;
  526                 case ND6_LLINFO_REACHABLE:
  527                         if (ln->ln_expire) {
  528                                 ln->ln_state = ND6_LLINFO_STALE;
  529                                 ln->ln_expire = time_second + nd6_gctimer;
  530                         }
  531                         break;
  532 
  533                 case ND6_LLINFO_STALE:
  534                         /* Garbage Collection(RFC 2461 5.3) */
  535                         if (ln->ln_expire)
  536                                 next = nd6_free(rt);
  537                         break;
  538 
  539                 case ND6_LLINFO_DELAY:
  540                         if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) {
  541                                 /* We need NUD */
  542                                 ln->ln_asked = 1;
  543                                 ln->ln_state = ND6_LLINFO_PROBE;
  544                                 ln->ln_expire = time_second +
  545                                         ndi->retrans / 1000;
  546                                 nd6_ns_output(ifp, &dst->sin6_addr,
  547                                               &dst->sin6_addr,
  548                                               ln, 0);
  549                         } else {
  550                                 ln->ln_state = ND6_LLINFO_STALE; /* XXX */
  551                                 ln->ln_expire = time_second + nd6_gctimer;
  552                         }
  553                         break;
  554                 case ND6_LLINFO_PROBE:
  555                         if (ln->ln_asked < nd6_umaxtries) {
  556                                 ln->ln_asked++;
  557                                 ln->ln_expire = time_second +
  558                                         nd_ifinfo[ifp->if_index].retrans / 1000;
  559                                 nd6_ns_output(ifp, &dst->sin6_addr,
  560                                                &dst->sin6_addr, ln, 0);
  561                         } else {
  562                                 next = nd6_free(rt);
  563                         }
  564                         break;
  565                 }
  566                 ln = next;
  567         }
  568         
  569         /* expire default router list */
  570         dr = TAILQ_FIRST(&nd_defrouter);
  571         while (dr) {
  572                 if (dr->expire && dr->expire < time_second) {
  573                         struct nd_defrouter *t;
  574                         t = TAILQ_NEXT(dr, dr_entry);
  575                         defrtrlist_del(dr);
  576                         dr = t;
  577                 } else {
  578                         dr = TAILQ_NEXT(dr, dr_entry);
  579                 }
  580         }
  581 
  582         /*
  583          * expire interface addresses.
  584          * in the past the loop was inside prefix expiry processing.
  585          * However, from a stricter speci-confrmance standpoint, we should
  586          * rather separate address lifetimes and prefix lifetimes.
  587          */
  588   addrloop:
  589         for (ia6 = in6_ifaddr; ia6; ia6 = nia6) {
  590                 nia6 = ia6->ia_next;
  591                 /* check address lifetime */
  592                 lt6 = &ia6->ia6_lifetime;
  593                 if (IFA6_IS_INVALID(ia6)) {
  594                         int regen = 0;
  595 
  596                         /*
  597                          * If the expiring address is temporary, try
  598                          * regenerating a new one.  This would be useful when
  599                          * we suspended a laptop PC, then turned it on after a
  600                          * period that could invalidate all temporary
  601                          * addresses.  Although we may have to restart the
  602                          * loop (see below), it must be after purging the
  603                          * address.  Otherwise, we'd see an infinite loop of
  604                          * regeneration. 
  605                          */
  606                         if (ip6_use_tempaddr &&
  607                             (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
  608                                 if (regen_tmpaddr(ia6) == 0)
  609                                         regen = 1;
  610                         }
  611 
  612                         in6_purgeaddr(&ia6->ia_ifa);
  613 
  614                         if (regen)
  615                                 goto addrloop; /* XXX: see below */
  616                 }
  617                 if (IFA6_IS_DEPRECATED(ia6)) {
  618                         int oldflags = ia6->ia6_flags;
  619 
  620                         ia6->ia6_flags |= IN6_IFF_DEPRECATED;
  621 
  622                         /*
  623                          * If a temporary address has just become deprecated,
  624                          * regenerate a new one if possible.
  625                          */
  626                         if (ip6_use_tempaddr &&
  627                             (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
  628                             (oldflags & IN6_IFF_DEPRECATED) == 0) {
  629 
  630                                 if (regen_tmpaddr(ia6) == 0) {
  631                                         /*
  632                                          * A new temporary address is
  633                                          * generated.
  634                                          * XXX: this means the address chain
  635                                          * has changed while we are still in
  636                                          * the loop.  Although the change
  637                                          * would not cause disaster (because
  638                                          * it's not a deletion, but an
  639                                          * addition,) we'd rather restart the
  640                                          * loop just for safety.  Or does this 
  641                                          * significantly reduce performance??
  642                                          */
  643                                         goto addrloop;
  644                                 }
  645                         }
  646                 } else {
  647                         /*
  648                          * A new RA might have made a deprecated address
  649                          * preferred.
  650                          */
  651                         ia6->ia6_flags &= ~IN6_IFF_DEPRECATED;
  652                 }
  653         }
  654 
  655         /* expire prefix list */
  656         pr = nd_prefix.lh_first;
  657         while (pr) {
  658                 /*
  659                  * check prefix lifetime.
  660                  * since pltime is just for autoconf, pltime processing for
  661                  * prefix is not necessary.
  662                  */
  663                 if (pr->ndpr_expire && pr->ndpr_expire < time_second) {
  664                         struct nd_prefix *t;
  665                         t = pr->ndpr_next;
  666 
  667                         /*
  668                          * address expiration and prefix expiration are
  669                          * separate.  NEVER perform in6_purgeaddr here.
  670                          */
  671 
  672                         prelist_remove(pr);
  673                         pr = t;
  674                 } else
  675                         pr = pr->ndpr_next;
  676         }
  677         splx(s);
  678 }
  679 
  680 static int
  681 regen_tmpaddr(ia6)
  682         struct in6_ifaddr *ia6; /* deprecated/invalidated temporary address */
  683 {
  684         struct ifaddr *ifa;
  685         struct ifnet *ifp;
  686         struct in6_ifaddr *public_ifa6 = NULL;
  687 
  688         ifp = ia6->ia_ifa.ifa_ifp;
  689         for (ifa = ifp->if_addrlist.tqh_first; ifa;
  690              ifa = ifa->ifa_list.tqe_next)
  691         {
  692                 struct in6_ifaddr *it6;
  693 
  694                 if (ifa->ifa_addr->sa_family != AF_INET6)
  695                         continue;
  696 
  697                 it6 = (struct in6_ifaddr *)ifa;
  698 
  699                 /* ignore no autoconf addresses. */
  700                 if ((it6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
  701                         continue;
  702 
  703                 /* ignore autoconf addresses with different prefixes. */
  704                 if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr)
  705                         continue;
  706 
  707                 /*
  708                  * Now we are looking at an autoconf address with the same
  709                  * prefix as ours.  If the address is temporary and is still
  710                  * preferred, do not create another one.  It would be rare, but
  711                  * could happen, for example, when we resume a laptop PC after
  712                  * a long period.
  713                  */
  714                 if ((it6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
  715                     !IFA6_IS_DEPRECATED(it6)) {
  716                         public_ifa6 = NULL;
  717                         break;
  718                 }
  719 
  720                 /*
  721                  * This is a public autoconf address that has the same prefix
  722                  * as ours.  If it is preferred, keep it.  We can't break the
  723                  * loop here, because there may be a still-preferred temporary
  724                  * address with the prefix.
  725                  */
  726                 if (!IFA6_IS_DEPRECATED(it6))
  727                     public_ifa6 = it6;
  728         }
  729 
  730         if (public_ifa6 != NULL) {
  731                 int e;
  732 
  733                 if ((e = in6_tmpifadd(public_ifa6, 0)) != 0) {
  734                         log(LOG_NOTICE, "regen_tmpaddr: failed to create a new"
  735                             " tmp addr,errno=%d\n", e);
  736                         return(-1);
  737                 }
  738                 return(0);
  739         }
  740 
  741         return(-1);
  742 }
  743 
  744 /*
  745  * Nuke neighbor cache/prefix/default router management table, right before
  746  * ifp goes away.
  747  */
  748 void
  749 nd6_purge(ifp)
  750         struct ifnet *ifp;
  751 {
  752         struct llinfo_nd6 *ln, *nln;
  753         struct nd_defrouter *dr, *ndr, drany;
  754         struct nd_prefix *pr, *npr;
  755 
  756         /* Nuke default router list entries toward ifp */
  757         if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) {
  758                 /*
  759                  * The first entry of the list may be stored in
  760                  * the routing table, so we'll delete it later.
  761                  */
  762                 for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = ndr) {
  763                         ndr = TAILQ_NEXT(dr, dr_entry);
  764                         if (dr->ifp == ifp)
  765                                 defrtrlist_del(dr);
  766                 }
  767                 dr = TAILQ_FIRST(&nd_defrouter);
  768                 if (dr->ifp == ifp)
  769                         defrtrlist_del(dr);
  770         }
  771 
  772         /* Nuke prefix list entries toward ifp */
  773         for (pr = nd_prefix.lh_first; pr; pr = npr) {
  774                 npr = pr->ndpr_next;
  775                 if (pr->ndpr_ifp == ifp) {
  776                         /*
  777                          * Previously, pr->ndpr_addr is removed as well,
  778                          * but I strongly believe we don't have to do it.
  779                          * nd6_purge() is only called from in6_ifdetach(),
  780                          * which removes all the associated interface addresses
  781                          * by itself.
  782                          * (jinmei@kame.net 20010129)
  783                          */
  784                         prelist_remove(pr);
  785                 }
  786         }
  787 
  788         /* cancel default outgoing interface setting */
  789         if (nd6_defifindex == ifp->if_index)
  790                 nd6_setdefaultiface(0);
  791 
  792         if (!ip6_forwarding && (ip6_accept_rtadv || (ifp->if_eflags & IFEF_ACCEPT_RTADVD))) { 
  793                 /* refresh default router list */
  794                 bzero(&drany, sizeof(drany));
  795                 defrouter_delreq(&drany, 0);
  796                 defrouter_select();
  797         }
  798 
  799         /*
  800          * Nuke neighbor cache entries for the ifp.
  801          * Note that rt->rt_ifp may not be the same as ifp,
  802          * due to KAME goto ours hack.  See RTM_RESOLVE case in
  803          * nd6_rtrequest(), and ip6_input().
  804          */
  805         ln = llinfo_nd6.ln_next;
  806         while (ln && ln != &llinfo_nd6) {
  807                 struct rtentry *rt;
  808                 struct sockaddr_dl *sdl;
  809 
  810                 nln = ln->ln_next;
  811                 rt = ln->ln_rt;
  812                 if (rt && rt->rt_gateway &&
  813                     rt->rt_gateway->sa_family == AF_LINK) {
  814                         sdl = (struct sockaddr_dl *)rt->rt_gateway;
  815                         if (sdl->sdl_index == ifp->if_index)
  816                                 nln = nd6_free(rt);
  817                 }
  818                 ln = nln;
  819         }
  820 }
  821 
  822 struct rtentry *
  823 nd6_lookup(addr6, create, ifp)
  824         struct in6_addr *addr6;
  825         int create;
  826         struct ifnet *ifp;
  827 {
  828         struct rtentry *rt;
  829         struct sockaddr_in6 sin6;
  830 
  831         bzero(&sin6, sizeof(sin6));
  832         sin6.sin6_len = sizeof(struct sockaddr_in6);
  833         sin6.sin6_family = AF_INET6;
  834         sin6.sin6_addr = *addr6;
  835 #if SCOPEDROUTING
  836         sin6.sin6_scope_id = in6_addr2scopeid(ifp, addr6);
  837 #endif
  838         rt = rtalloc1((struct sockaddr *)&sin6, create, 0UL);
  839         if (rt && (rt->rt_flags & RTF_LLINFO) == 0) {
  840                 /*
  841                  * This is the case for the default route.
  842                  * If we want to create a neighbor cache for the address, we
  843                  * should free the route for the destination and allocate an
  844                  * interface route.
  845                  */
  846                 if (create) {
  847                         rtfree(rt);
  848                         rt = 0;
  849                 }
  850         }
  851         if (!rt) {
  852                 if (create && ifp) {
  853                         int e;
  854 
  855                         /*
  856                          * If no route is available and create is set,
  857                          * we allocate a host route for the destination
  858                          * and treat it like an interface route.
  859                          * This hack is necessary for a neighbor which can't
  860                          * be covered by our own prefix.
  861                          */
  862                         struct ifaddr *ifa =
  863                                 ifaof_ifpforaddr((struct sockaddr *)&sin6, ifp);
  864                         if (ifa == NULL)
  865                                 return(NULL);
  866 
  867                         /*
  868                          * Create a new route.  RTF_LLINFO is necessary
  869                          * to create a Neighbor Cache entry for the
  870                          * destination in nd6_rtrequest which will be
  871                          * called in rtrequest via ifa->ifa_rtrequest.
  872                          */
  873                         if ((e = rtrequest(RTM_ADD, (struct sockaddr *)&sin6,
  874                                            ifa->ifa_addr,
  875                                            (struct sockaddr *)&all1_sa,
  876                                            (ifa->ifa_flags |
  877                                             RTF_HOST | RTF_LLINFO) &
  878                                            ~RTF_CLONING,
  879                                            &rt)) != 0)
  880                                 log(LOG_ERR,
  881                                     "nd6_lookup: failed to add route for a "
  882                                     "neighbor(%s), errno=%d\n",
  883                                     ip6_sprintf(addr6), e);
  884                         if (rt == NULL)
  885                                 return(NULL);
  886                         if (rt->rt_llinfo) {
  887                                 struct llinfo_nd6 *ln =
  888                                         (struct llinfo_nd6 *)rt->rt_llinfo;
  889                                 ln->ln_state = ND6_LLINFO_NOSTATE;
  890                         }
  891                 } else
  892                         return(NULL);
  893         }
  894         rtunref(rt);
  895         /*
  896          * Validation for the entry.
  897          * Note that the check for rt_llinfo is necessary because a cloned
  898          * route from a parent route that has the L flag (e.g. the default
  899          * route to a p2p interface) may have the flag, too, while the
  900          * destination is not actually a neighbor.
  901          * XXX: we can't use rt->rt_ifp to check for the interface, since
  902          *      it might be the loopback interface if the entry is for our
  903          *      own address on a non-loopback interface. Instead, we should
  904          *      use rt->rt_ifa->ifa_ifp, which would specify the REAL
  905          *      interface.
  906          */
  907         if ((ifp->if_type !=IFT_PPP) && ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_flags & RTF_LLINFO) == 0 ||
  908             rt->rt_gateway->sa_family != AF_LINK ||  rt->rt_llinfo == NULL ||
  909 
  910             (ifp && rt->rt_ifa->ifa_ifp != ifp))) {
  911                 if (create) {
  912                         log(LOG_DEBUG, "nd6_lookup: failed to lookup %s (if = %s)\n",
  913                             ip6_sprintf(addr6), ifp ? if_name(ifp) : "unspec");
  914                         /* xxx more logs... kazu */
  915                 }
  916                 return(NULL);
  917         }
  918         return(rt);
  919 }
  920 
  921 /*
  922  * Detect if a given IPv6 address identifies a neighbor on a given link.
  923  * XXX: should take care of the destination of a p2p link?
  924  */
  925 int
  926 nd6_is_addr_neighbor(addr, ifp)
  927         struct sockaddr_in6 *addr;
  928         struct ifnet *ifp;
  929 {
  930         struct ifaddr *ifa;
  931         int i;
  932 
  933 #define IFADDR6(a) ((((struct in6_ifaddr *)(a))->ia_addr).sin6_addr)
  934 #define IFMASK6(a) ((((struct in6_ifaddr *)(a))->ia_prefixmask).sin6_addr)
  935 
  936         /*
  937          * A link-local address is always a neighbor.
  938          * XXX: we should use the sin6_scope_id field rather than the embedded
  939          * interface index.
  940          */
  941         if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr) &&
  942             ntohs(*(u_int16_t *)&addr->sin6_addr.s6_addr[2]) == ifp->if_index)
  943                 return(1);
  944 
  945         /*
  946          * If the address matches one of our addresses,
  947          * it should be a neighbor.
  948          */
  949         for (ifa = ifp->if_addrlist.tqh_first;
  950              ifa;
  951              ifa = ifa->ifa_list.tqe_next)
  952         {
  953                 if (ifa->ifa_addr->sa_family != AF_INET6)
  954                         next: continue;
  955 
  956                 for (i = 0; i < 4; i++) {
  957                         if ((IFADDR6(ifa).s6_addr32[i] ^
  958                              addr->sin6_addr.s6_addr32[i]) &
  959                             IFMASK6(ifa).s6_addr32[i])
  960                                 goto next;
  961                 }
  962                 return(1);
  963         }
  964 
  965         /*
  966          * Even if the address matches none of our addresses, it might be
  967          * in the neighbor cache.
  968          */
  969         if (nd6_lookup(&addr->sin6_addr, 0, ifp) != NULL)
  970                 return(1);
  971 
  972         return(0);
  973 #undef IFADDR6
  974 #undef IFMASK6
  975 }
  976 
  977 /*
  978  * Free an nd6 llinfo entry.
  979  */
  980 struct llinfo_nd6 *
  981 nd6_free(rt)
  982         struct rtentry *rt;
  983 {
  984         struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo, *next;
  985         struct in6_addr in6 = ((struct sockaddr_in6 *)rt_key(rt))->sin6_addr;
  986         struct nd_defrouter *dr;
  987 
  988         /*
  989          * we used to have pfctlinput(PRC_HOSTDEAD) here. 
  990          * even though it is not harmful, it was not really necessary.
  991          */
  992 
  993         if (!ip6_forwarding && (ip6_accept_rtadv || (rt->rt_ifp->if_eflags & IFEF_ACCEPT_RTADVD))) {
  994                 int s;
  995                 s = splnet();
  996                 dr = defrouter_lookup(&((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
  997                                       rt->rt_ifp);
  998 
  999                 if (ln && ln->ln_router || dr) {
 1000                         /*
 1001                          * rt6_flush must be called whether or not the neighbor
 1002                          * is in the Default Router List.
 1003                          * See a corresponding comment in nd6_na_input().
 1004                          */
 1005                         rt6_flush(&in6, rt->rt_ifp);
 1006                 }
 1007 
 1008                 if (dr) {
 1009                         /*
 1010                          * Unreachablity of a router might affect the default
 1011                          * router selection and on-link detection of advertised
 1012                          * prefixes.
 1013                          */
 1014 
 1015                         /*
 1016                          * Temporarily fake the state to choose a new default
 1017                          * router and to perform on-link determination of
 1018                          * prefixes correctly.
 1019                          * Below the state will be set correctly,
 1020                          * or the entry itself will be deleted.
 1021                          */
 1022                         ln->ln_state = ND6_LLINFO_INCOMPLETE;
 1023 
 1024                         /*
 1025                          * Since defrouter_select() does not affect the
 1026                          * on-link determination and MIP6 needs the check
 1027                          * before the default router selection, we perform
 1028                          * the check now.
 1029                          */
 1030                         pfxlist_onlink_check();
 1031 
 1032                         if (dr == TAILQ_FIRST(&nd_defrouter)) {
 1033                                 /*
 1034                                  * It is used as the current default router,
 1035                                  * so we have to move it to the end of the
 1036                                  * list and choose a new one.
 1037                                  * XXX: it is not very efficient if this is
 1038                                  *      the only router.
 1039                                  */
 1040                                 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
 1041                                 TAILQ_INSERT_TAIL(&nd_defrouter, dr, dr_entry);
 1042 
 1043                                 defrouter_select();
 1044                         }
 1045                 }
 1046                 splx(s);
 1047         }
 1048 
 1049         /*
 1050          * Before deleting the entry, remember the next entry as the
 1051          * return value.  We need this because pfxlist_onlink_check() above
 1052          * might have freed other entries (particularly the old next entry) as
 1053          * a side effect (XXX).
 1054          */
 1055         if (ln)
 1056                 next = ln->ln_next;
 1057         else
 1058                 next = 0;
 1059 
 1060         /*
 1061          * Detach the route from the routing tree and the list of neighbor
 1062          * caches, and disable the route entry not to be used in already
 1063          * cached routes.
 1064          */
 1065         rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0,
 1066                   rt_mask(rt), 0, (struct rtentry **)0);
 1067 
 1068         return(next);
 1069 }
 1070 
 1071 /*
 1072  * Upper-layer reachability hint for Neighbor Unreachability Detection.
 1073  *
 1074  * XXX cost-effective metods?
 1075  */
 1076 void
 1077 nd6_nud_hint(rt, dst6, force)
 1078         struct rtentry *rt;
 1079         struct in6_addr *dst6;
 1080         int force;
 1081 {
 1082         struct llinfo_nd6 *ln;
 1083 
 1084         /*
 1085          * If the caller specified "rt", use that.  Otherwise, resolve the
 1086          * routing table by supplied "dst6".
 1087          */
 1088         if (!rt) {
 1089                 if (!dst6)
 1090                         return;
 1091                 if (!(rt = nd6_lookup(dst6, 0, NULL)))
 1092                         return;
 1093         }
 1094 
 1095         if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
 1096             (rt->rt_flags & RTF_LLINFO) == 0 ||
 1097             !rt->rt_llinfo || !rt->rt_gateway ||
 1098             rt->rt_gateway->sa_family != AF_LINK) {
 1099                 /* This is not a host route. */
 1100                 return;
 1101         }
 1102 
 1103         ln = (struct llinfo_nd6 *)rt->rt_llinfo;
 1104         if (ln->ln_state < ND6_LLINFO_REACHABLE)
 1105                 return;
 1106 
 1107         /*
 1108          * if we get upper-layer reachability confirmation many times,
 1109          * it is possible we have false information.
 1110          */
 1111         if (!force) {
 1112                 ln->ln_byhint++;
 1113                 if (ln->ln_byhint > nd6_maxnudhint)
 1114                         return;
 1115         }
 1116 
 1117         ln->ln_state = ND6_LLINFO_REACHABLE;
 1118         if (ln->ln_expire)
 1119                 ln->ln_expire = time_second +
 1120                         nd_ifinfo[rt->rt_ifp->if_index].reachable;
 1121 }
 1122 
 1123 void
 1124 nd6_rtrequest(req, rt, sa)
 1125         int     req;
 1126         struct rtentry *rt;
 1127         struct sockaddr *sa; /* xxx unused */
 1128 {
 1129         struct sockaddr *gate = rt->rt_gateway;
 1130         struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo;
 1131         static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
 1132         struct ifnet *ifp = rt->rt_ifp;
 1133         struct ifaddr *ifa;
 1134 
 1135         if ((rt->rt_flags & RTF_GATEWAY))
 1136                 return;
 1137 
 1138         if (nd6_need_cache(ifp) == 0 && (rt->rt_flags & RTF_HOST) == 0) {
 1139                 /*
 1140                  * This is probably an interface direct route for a link
 1141                  * which does not need neighbor caches (e.g. fe80::%lo0/64).
 1142                  * We do not need special treatment below for such a route.
 1143                  * Moreover, the RTF_LLINFO flag which would be set below
 1144                  * would annoy the ndp(8) command.
 1145                  */
 1146                 return;
 1147         }
 1148 
 1149         if (req == RTM_RESOLVE &&
 1150             (nd6_need_cache(ifp) == 0 || /* stf case */
 1151              !nd6_is_addr_neighbor((struct sockaddr_in6 *)rt_key(rt), ifp))) {
 1152                 /*
 1153                  * FreeBSD and BSD/OS often make a cloned host route based
 1154                  * on a less-specific route (e.g. the default route).
 1155                  * If the less specific route does not have a "gateway"
 1156                  * (this is the case when the route just goes to a p2p or an
 1157                  * stf interface), we'll mistakenly make a neighbor cache for
 1158                  * the host route, and will see strange neighbor solicitation
 1159                  * for the corresponding destination.  In order to avoid the
 1160                  * confusion, we check if the destination of the route is
 1161                  * a neighbor in terms of neighbor discovery, and stop the
 1162                  * process if not.  Additionally, we remove the LLINFO flag
 1163                  * so that ndp(8) will not try to get the neighbor information
 1164                  * of the destination.
 1165                  */
 1166                 rt->rt_flags &= ~RTF_LLINFO;
 1167                 return;
 1168         }
 1169 
 1170         switch (req) {
 1171         case RTM_ADD:
 1172                 /*
 1173                  * There is no backward compatibility :)
 1174                  *
 1175                  * if ((rt->rt_flags & RTF_HOST) == 0 &&
 1176                  *     SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff)
 1177                  *         rt->rt_flags |= RTF_CLONING;
 1178                  */
 1179                 if (rt->rt_flags & (RTF_CLONING | RTF_LLINFO)) {
 1180                         /*
 1181                          * Case 1: This route should come from
 1182                          * a route to interface.  RTF_LLINFO flag is set
 1183                          * for a host route whose destination should be
 1184                          * treated as on-link.
 1185                          */
 1186                         rt_setgate(rt, rt_key(rt),
 1187                                    (struct sockaddr *)&null_sdl);
 1188                         gate = rt->rt_gateway;
 1189                         SDL(gate)->sdl_type = ifp->if_type;
 1190                         SDL(gate)->sdl_index = ifp->if_index;
 1191                         if (ln)
 1192                                 ln->ln_expire = time_second;
 1193 #if 1
 1194                         if (ln && ln->ln_expire == 0) {
 1195                                 /* kludge for desktops */
 1196 #if 0
 1197                                 printf("nd6_rtequest: time.tv_sec is zero; "
 1198                                        "treat it as 1\n");
 1199 #endif
 1200                                 ln->ln_expire = 1;
 1201                         }
 1202 #endif
 1203                         if ((rt->rt_flags & RTF_CLONING))
 1204                                 break;
 1205                 }
 1206                 /*
 1207                  * In IPv4 code, we try to annonuce new RTF_ANNOUNCE entry here.
 1208                  * We don't do that here since llinfo is not ready yet.
 1209                  *
 1210                  * There are also couple of other things to be discussed:
 1211                  * - unsolicited NA code needs improvement beforehand
 1212                  * - RFC2461 says we MAY send multicast unsolicited NA
 1213                  *   (7.2.6 paragraph 4), however, it also says that we
 1214                  *   SHOULD provide a mechanism to prevent multicast NA storm.
 1215                  *   we don't have anything like it right now.
 1216                  *   note that the mechanism needs a mutual agreement
 1217                  *   between proxies, which means that we need to implement
 1218                  *   a new protocol, or a new kludge.
 1219                  * - from RFC2461 6.2.4, host MUST NOT send an unsolicited NA.
 1220                  *   we need to check ip6forwarding before sending it.
 1221                  *   (or should we allow proxy ND configuration only for
 1222                  *   routers?  there's no mention about proxy ND from hosts)
 1223                  */
 1224 #if 0
 1225                 /* XXX it does not work */
 1226                 if (rt->rt_flags & RTF_ANNOUNCE)
 1227                         nd6_na_output(ifp,
 1228                               &SIN6(rt_key(rt))->sin6_addr,
 1229                               &SIN6(rt_key(rt))->sin6_addr,
 1230                               ip6_forwarding ? ND_NA_FLAG_ROUTER : 0,
 1231                               1, NULL);
 1232 #endif
 1233                 /* FALLTHROUGH */
 1234         case RTM_RESOLVE:
 1235                 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) {
 1236                         /*
 1237                          * Address resolution isn't necessary for a point to
 1238                          * point link, so we can skip this test for a p2p link.
 1239                          */
 1240                         if (gate->sa_family != AF_LINK ||
 1241                             gate->sa_len < sizeof(null_sdl)) {
 1242                                 log(LOG_DEBUG,
 1243                                     "nd6_rtrequest: bad gateway value: %s\n",
 1244                                     if_name(ifp));
 1245                                 break;
 1246                         }
 1247                         SDL(gate)->sdl_type = ifp->if_type;
 1248                         SDL(gate)->sdl_index = ifp->if_index;
 1249                 }
 1250                 if (ln != NULL)
 1251                         break;  /* This happens on a route change */
 1252                 /*
 1253                  * Case 2: This route may come from cloning, or a manual route
 1254                  * add with a LL address.
 1255                  */
 1256                 R_Malloc(ln, struct llinfo_nd6 *, sizeof(*ln));
 1257                 rt->rt_llinfo = (caddr_t)ln;
 1258                 if (!ln) {
 1259                         log(LOG_DEBUG, "nd6_rtrequest: malloc failed\n");
 1260                         break;
 1261                 }
 1262                 nd6_inuse++;
 1263                 nd6_allocated++;
 1264                 Bzero(ln, sizeof(*ln));
 1265                 ln->ln_rt = rt;
 1266                 /* this is required for "ndp" command. - shin */
 1267                 if (req == RTM_ADD) {
 1268                         /*
 1269                          * gate should have some valid AF_LINK entry,
 1270                          * and ln->ln_expire should have some lifetime
 1271                          * which is specified by ndp command.
 1272                          */
 1273                         ln->ln_state = ND6_LLINFO_REACHABLE;
 1274                         ln->ln_byhint = 0;
 1275                 } else {
 1276                         /*
 1277                          * When req == RTM_RESOLVE, rt is created and
 1278                          * initialized in rtrequest(), so rt_expire is 0.
 1279                          */
 1280                         ln->ln_state = ND6_LLINFO_NOSTATE;
 1281                         ln->ln_expire = time_second;
 1282                 }
 1283                 rt->rt_flags |= RTF_LLINFO;
 1284                 ln->ln_next = llinfo_nd6.ln_next;
 1285                 llinfo_nd6.ln_next = ln;
 1286                 ln->ln_prev = &llinfo_nd6;
 1287                 ln->ln_next->ln_prev = ln;
 1288 
 1289                 /*
 1290                  * check if rt_key(rt) is one of my address assigned
 1291                  * to the interface.
 1292                  */
 1293                 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(rt->rt_ifp,
 1294                                           &SIN6(rt_key(rt))->sin6_addr);
 1295                 if (ifa) {
 1296                         caddr_t macp = nd6_ifptomac(ifp);
 1297                         ln->ln_expire = 0;
 1298                         ln->ln_state = ND6_LLINFO_REACHABLE;
 1299                         ln->ln_byhint = 0;
 1300                         if (macp) {
 1301                                 Bcopy(macp, LLADDR(SDL(gate)), ifp->if_addrlen);
 1302                                 SDL(gate)->sdl_alen = ifp->if_addrlen;
 1303                         }
 1304                         if (nd6_useloopback) {
 1305                                 rt->rt_ifp = &loif[0];  /* XXX */
 1306                                 /*
 1307                                  * Make sure rt_ifa be equal to the ifaddr
 1308                                  * corresponding to the address.
 1309                                  * We need this because when we refer
 1310                                  * rt_ifa->ia6_flags in ip6_input, we assume
 1311                                  * that the rt_ifa points to the address instead
 1312                                  * of the loopback address.
 1313                                  */
 1314                                 if (ifa != rt->rt_ifa) {
 1315                                         rtsetifa(rt, ifa);
 1316                                 }
 1317                         }
 1318                 } else if (rt->rt_flags & RTF_ANNOUNCE) {
 1319                         ln->ln_expire = 0;
 1320                         ln->ln_state = ND6_LLINFO_REACHABLE;
 1321                         ln->ln_byhint = 0;
 1322 
 1323                         /* join solicited node multicast for proxy ND */
 1324                         if (ifp->if_flags & IFF_MULTICAST) {
 1325                                 struct in6_addr llsol;
 1326                                 int error;
 1327 
 1328                                 llsol = SIN6(rt_key(rt))->sin6_addr;
 1329                                 llsol.s6_addr16[0] = htons(0xff02);
 1330                                 llsol.s6_addr16[1] = htons(ifp->if_index);
 1331                                 llsol.s6_addr32[1] = 0;
 1332                                 llsol.s6_addr32[2] = htonl(1);
 1333                                 llsol.s6_addr8[12] = 0xff;
 1334 
 1335                                 if (!in6_addmulti(&llsol, ifp, &error)) {
 1336                                         nd6log((LOG_ERR, "%s: failed to join "
 1337                                             "%s (errno=%d)\n", if_name(ifp),
 1338                                             ip6_sprintf(&llsol), error));
 1339                                 }
 1340                         }
 1341                 }
 1342                 break;
 1343 
 1344         case RTM_DELETE:
 1345                 if (!ln)
 1346                         break;
 1347                 /* leave from solicited node multicast for proxy ND */
 1348                 if ((rt->rt_flags & RTF_ANNOUNCE) != 0 &&
 1349                     (ifp->if_flags & IFF_MULTICAST) != 0) {
 1350                         struct in6_addr llsol;
 1351                         struct in6_multi *in6m;
 1352 
 1353                         llsol = SIN6(rt_key(rt))->sin6_addr;
 1354                         llsol.s6_addr16[0] = htons(0xff02);
 1355                         llsol.s6_addr16[1] = htons(ifp->if_index);
 1356                         llsol.s6_addr32[1] = 0;
 1357                         llsol.s6_addr32[2] = htonl(1);
 1358                         llsol.s6_addr8[12] = 0xff;
 1359 
 1360                         IN6_LOOKUP_MULTI(llsol, ifp, in6m);
 1361                         if (in6m)
 1362                                 in6_delmulti(in6m);
 1363                 }
 1364                 nd6_inuse--;
 1365                 ln->ln_next->ln_prev = ln->ln_prev;
 1366                 ln->ln_prev->ln_next = ln->ln_next;
 1367                 ln->ln_prev = NULL;
 1368                 rt->rt_llinfo = 0;
 1369                 rt->rt_flags &= ~RTF_LLINFO;
 1370                 if (ln->ln_hold)
 1371                         m_freem(ln->ln_hold);
 1372                 ln->ln_hold = NULL;
 1373                 Free((caddr_t)ln);
 1374         }
 1375 }
 1376 
 1377 int
 1378 nd6_ioctl(cmd, data, ifp)
 1379         u_long cmd;
 1380         caddr_t data;
 1381         struct ifnet *ifp;
 1382 {
 1383         struct in6_drlist *drl = (struct in6_drlist *)data;
 1384         struct in6_prlist *prl = (struct in6_prlist *)data;
 1385         struct in6_ndireq *ndi = (struct in6_ndireq *)data;
 1386         struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data;
 1387         struct in6_ndifreq *ndif = (struct in6_ndifreq *)data;
 1388         struct nd_defrouter *dr, any;
 1389         struct nd_prefix *pr;
 1390         struct rtentry *rt;
 1391         int i = 0, error = 0;
 1392         int s;
 1393 
 1394         switch (cmd) {
 1395         case SIOCGDRLST_IN6:
 1396                 /*
 1397                  * obsolete API, use sysctl under net.inet6.icmp6
 1398                  */
 1399                 bzero(drl, sizeof(*drl));
 1400                 s = splnet();
 1401                 dr = TAILQ_FIRST(&nd_defrouter);
 1402                 while (dr && i < DRLSTSIZ) {
 1403                         drl->defrouter[i].rtaddr = dr->rtaddr;
 1404                         if (IN6_IS_ADDR_LINKLOCAL(&drl->defrouter[i].rtaddr)) {
 1405                                 /* XXX: need to this hack for KAME stack */
 1406                                 drl->defrouter[i].rtaddr.s6_addr16[1] = 0;
 1407                         } else
 1408                                 log(LOG_ERR,
 1409                                     "default router list contains a "
 1410                                     "non-linklocal address(%s)\n",
 1411                                     ip6_sprintf(&drl->defrouter[i].rtaddr));
 1412 
 1413                         drl->defrouter[i].flags = dr->flags;
 1414                         drl->defrouter[i].rtlifetime = dr->rtlifetime;
 1415                         drl->defrouter[i].expire = dr->expire;
 1416                         drl->defrouter[i].if_index = dr->ifp->if_index;
 1417                         i++;
 1418                         dr = TAILQ_NEXT(dr, dr_entry);
 1419                 }
 1420                 splx(s);
 1421                 break;
 1422         case SIOCGPRLST_IN6:
 1423                 /*
 1424                  * obsolete API, use sysctl under net.inet6.icmp6
 1425                  */
 1426                 /*
 1427                  * XXX meaning of fields, especialy "raflags", is very
 1428                  * differnet between RA prefix list and RR/static prefix list.
 1429                  * how about separating ioctls into two?
 1430                  */
 1431                 bzero(prl, sizeof(*prl));
 1432                 s = splnet();
 1433                 pr = nd_prefix.lh_first;
 1434                 while (pr && i < PRLSTSIZ) {
 1435                         struct nd_pfxrouter *pfr;
 1436                         int j;
 1437 
 1438                         (void)in6_embedscope(&prl->prefix[i].prefix,
 1439                             &pr->ndpr_prefix, NULL, NULL);
 1440                         prl->prefix[i].raflags = pr->ndpr_raf;
 1441                         prl->prefix[i].prefixlen = pr->ndpr_plen;
 1442                         prl->prefix[i].vltime = pr->ndpr_vltime;
 1443                         prl->prefix[i].pltime = pr->ndpr_pltime;
 1444                         prl->prefix[i].if_index = pr->ndpr_ifp->if_index;
 1445                         prl->prefix[i].expire = pr->ndpr_expire;
 1446 
 1447                         pfr = pr->ndpr_advrtrs.lh_first;
 1448                         j = 0;
 1449                         while (pfr) {
 1450                                 if (j < DRLSTSIZ) {
 1451 #define RTRADDR prl->prefix[i].advrtr[j]
 1452                                         RTRADDR = pfr->router->rtaddr;
 1453                                         if (IN6_IS_ADDR_LINKLOCAL(&RTRADDR)) {
 1454                                                 /* XXX: hack for KAME */
 1455                                                 RTRADDR.s6_addr16[1] = 0;
 1456                                         } else
 1457                                                 log(LOG_ERR,
 1458                                                     "a router(%s) advertises "
 1459                                                     "a prefix with "
 1460                                                     "non-link local address\n",
 1461                                                     ip6_sprintf(&RTRADDR));
 1462 #undef RTRADDR
 1463                                 }
 1464                                 j++;
 1465                                 pfr = pfr->pfr_next;
 1466                         }
 1467                         prl->prefix[i].advrtrs = j;
 1468                         prl->prefix[i].origin = PR_ORIG_RA;
 1469 
 1470                         i++;
 1471                         pr = pr->ndpr_next;
 1472                 }
 1473               {
 1474                 struct rr_prefix *rpp;
 1475 
 1476                 for (rpp = LIST_FIRST(&rr_prefix); rpp;
 1477                      rpp = LIST_NEXT(rpp, rp_entry)) {
 1478                         if (i >= PRLSTSIZ)
 1479                                 break;
 1480                         (void)in6_embedscope(&prl->prefix[i].prefix,
 1481                             &pr->ndpr_prefix, NULL, NULL);
 1482                         prl->prefix[i].raflags = rpp->rp_raf;
 1483                         prl->prefix[i].prefixlen = rpp->rp_plen;
 1484                         prl->prefix[i].vltime = rpp->rp_vltime;
 1485                         prl->prefix[i].pltime = rpp->rp_pltime;
 1486                         prl->prefix[i].if_index = rpp->rp_ifp->if_index;
 1487                         prl->prefix[i].expire = rpp->rp_expire;
 1488                         prl->prefix[i].advrtrs = 0;
 1489                         prl->prefix[i].origin = rpp->rp_origin;
 1490                         i++;
 1491                 }
 1492               }
 1493                 splx(s);
 1494 
 1495                 break;
 1496         case OSIOCGIFINFO_IN6:
 1497                 if (!nd_ifinfo || i >= nd_ifinfo_indexlim) {
 1498                         error = EINVAL;
 1499                         break;
 1500                 }
 1501                 ndi->ndi.linkmtu = nd_ifinfo[ifp->if_index].linkmtu;
 1502                 ndi->ndi.maxmtu = nd_ifinfo[ifp->if_index].maxmtu;
 1503                 ndi->ndi.basereachable =
 1504                     nd_ifinfo[ifp->if_index].basereachable;
 1505                 ndi->ndi.reachable = nd_ifinfo[ifp->if_index].reachable;
 1506                 ndi->ndi.retrans = nd_ifinfo[ifp->if_index].retrans;
 1507                 ndi->ndi.flags = nd_ifinfo[ifp->if_index].flags;
 1508                 ndi->ndi.recalctm = nd_ifinfo[ifp->if_index].recalctm;
 1509                 ndi->ndi.chlim = nd_ifinfo[ifp->if_index].chlim;
 1510                 ndi->ndi.receivedra = nd_ifinfo[ifp->if_index].receivedra;
 1511                 break;
 1512         case SIOCGIFINFO_IN6:
 1513                 if (!nd_ifinfo || i >= nd_ifinfo_indexlim) {
 1514                         error = EINVAL;
 1515                         break;
 1516                 }
 1517                 ndi->ndi = nd_ifinfo[ifp->if_index];
 1518                 break;
 1519         case SIOCSIFINFO_FLAGS:
 1520                 /* XXX: almost all other fields of ndi->ndi is unused */
 1521                 if (!nd_ifinfo || i >= nd_ifinfo_indexlim) {
 1522                         error = EINVAL;
 1523                         break;
 1524                 }
 1525                 nd_ifinfo[ifp->if_index].flags = ndi->ndi.flags;
 1526                 break;
 1527         case SIOCSNDFLUSH_IN6:  /* XXX: the ioctl name is confusing... */
 1528                 /* flush default router list */
 1529                 /*
 1530                  * xxx sumikawa: should not delete route if default
 1531                  * route equals to the top of default router list
 1532                  */
 1533                 bzero(&any, sizeof(any));
 1534                 defrouter_delreq(&any, 0);
 1535                 defrouter_select();
 1536                 /* xxx sumikawa: flush prefix list */
 1537                 break;
 1538         case SIOCSPFXFLUSH_IN6:
 1539             {
 1540                 /* flush all the prefix advertised by routers */
 1541                 struct nd_prefix *pr, *next;
 1542 
 1543                 s = splnet();
 1544                 for (pr = nd_prefix.lh_first; pr; pr = next) {
 1545                         struct in6_ifaddr *ia, *ia_next;
 1546 
 1547                         next = pr->ndpr_next;
 1548 
 1549                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1550                                 continue; /* XXX */
 1551 
 1552                         /* do we really have to remove addresses as well? */
 1553                         for (ia = in6_ifaddr; ia; ia = ia_next) {
 1554                                 /* ia might be removed.  keep the next ptr. */
 1555                                 ia_next = ia->ia_next;
 1556 
 1557                                 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1558                                         continue;
 1559 
 1560                                 if (ia->ia6_ndpr == pr)
 1561                                         in6_purgeaddr(&ia->ia_ifa);
 1562                         }
 1563                         prelist_remove(pr);
 1564                 }
 1565                 splx(s);
 1566                 break;
 1567             }
 1568         case SIOCSRTRFLUSH_IN6:
 1569             {
 1570                 /* flush all the default routers */
 1571                 struct nd_defrouter *dr, *next;
 1572 
 1573                 s = splnet();
 1574                 if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) {
 1575                         /*
 1576                          * The first entry of the list may be stored in
 1577                          * the routing table, so we'll delete it later.
 1578                          */
 1579                         for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = next) {
 1580                                 next = TAILQ_NEXT(dr, dr_entry);
 1581                                 defrtrlist_del(dr);
 1582                         }
 1583                         defrtrlist_del(TAILQ_FIRST(&nd_defrouter));
 1584                 }
 1585                 splx(s);
 1586                 break;
 1587             }
 1588         case SIOCGNBRINFO_IN6:
 1589             {
 1590                 struct llinfo_nd6 *ln;
 1591                 struct in6_addr nb_addr = nbi->addr; /* make local for safety */
 1592 
 1593                 /*
 1594                  * XXX: KAME specific hack for scoped addresses
 1595                  *      XXXX: for other scopes than link-local?
 1596                  */
 1597                 if (IN6_IS_ADDR_LINKLOCAL(&nbi->addr) ||
 1598                     IN6_IS_ADDR_MC_LINKLOCAL(&nbi->addr)) {
 1599                         u_int16_t *idp = (u_int16_t *)&nb_addr.s6_addr[2];
 1600 
 1601                         if (*idp == 0)
 1602                                 *idp = htons(ifp->if_index);
 1603                 }
 1604 
 1605                 s = splnet();
 1606                 if ((rt = nd6_lookup(&nb_addr, 0, ifp)) == NULL) {
 1607                         error = EINVAL;
 1608                         splx(s);
 1609                         break;
 1610                 }
 1611                 ln = (struct llinfo_nd6 *)rt->rt_llinfo;
 1612                 nbi->state = ln->ln_state;
 1613                 nbi->asked = ln->ln_asked;
 1614                 nbi->isrouter = ln->ln_router;
 1615                 nbi->expire = ln->ln_expire;
 1616                 splx(s);
 1617                 
 1618                 break;
 1619             }
 1620         case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
 1621                 ndif->ifindex = nd6_defifindex;
 1622                 break;
 1623         case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
 1624                 return(nd6_setdefaultiface(ndif->ifindex));
 1625                 break;
 1626         }
 1627         return(error);
 1628 }
 1629 
 1630 /*
 1631  * Create neighbor cache entry and cache link-layer address,
 1632  * on reception of inbound ND6 packets. (RS/RA/NS/redirect)
 1633  */
 1634 struct rtentry *
 1635 nd6_cache_lladdr(ifp, from, lladdr, lladdrlen, type, code)
 1636         struct ifnet *ifp;
 1637         struct in6_addr *from;
 1638         char *lladdr;
 1639         int lladdrlen;
 1640         int type;       /* ICMP6 type */
 1641         int code;       /* type dependent information */
 1642 {
 1643         struct rtentry *rt = NULL;
 1644         struct llinfo_nd6 *ln = NULL;
 1645         int is_newentry;
 1646         struct sockaddr_dl *sdl = NULL;
 1647         int do_update;
 1648         int olladdr;
 1649         int llchange;
 1650         int newstate = 0;
 1651 
 1652         if (!ifp)
 1653                 panic("ifp == NULL in nd6_cache_lladdr");
 1654         if (!from)
 1655                 panic("from == NULL in nd6_cache_lladdr");
 1656 
 1657         /* nothing must be updated for unspecified address */
 1658         if (IN6_IS_ADDR_UNSPECIFIED(from))
 1659                 return NULL;
 1660 
 1661         /*
 1662          * Validation about ifp->if_addrlen and lladdrlen must be done in
 1663          * the caller.
 1664          *
 1665          * XXX If the link does not have link-layer adderss, what should
 1666          * we do? (ifp->if_addrlen == 0)
 1667          * Spec says nothing in sections for RA, RS and NA.  There's small
 1668          * description on it in NS section (RFC 2461 7.2.3).
 1669          */
 1670 
 1671         rt = nd6_lookup(from, 0, ifp);
 1672         if (!rt) {
 1673 #if 0
 1674                 /* nothing must be done if there's no lladdr */
 1675                 if (!lladdr || !lladdrlen)
 1676                         return NULL;
 1677 #endif
 1678 
 1679                 rt = nd6_lookup(from, 1, ifp);
 1680                 is_newentry = 1;
 1681         } else {
 1682                 /* do nothing if static ndp is set */
 1683                 if (rt->rt_flags & RTF_STATIC)
 1684                         return NULL;
 1685                 is_newentry = 0;
 1686         }
 1687 
 1688         if (!rt)
 1689                 return NULL;
 1690         if ((rt->rt_flags & (RTF_GATEWAY | RTF_LLINFO)) != RTF_LLINFO) {
 1691 fail:
 1692                 (void)nd6_free(rt);
 1693                 return NULL;
 1694         }
 1695         ln = (struct llinfo_nd6 *)rt->rt_llinfo;
 1696         if (!ln)
 1697                 goto fail;
 1698         if (!rt->rt_gateway)
 1699                 goto fail;
 1700         if (rt->rt_gateway->sa_family != AF_LINK)
 1701                 goto fail;
 1702         sdl = SDL(rt->rt_gateway);
 1703 
 1704         olladdr = (sdl->sdl_alen) ? 1 : 0;
 1705         if (olladdr && lladdr) {
 1706                 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen))
 1707                         llchange = 1;
 1708                 else
 1709                         llchange = 0;
 1710         } else
 1711                 llchange = 0;
 1712 
 1713         /*
 1714          * newentry olladdr  lladdr  llchange   (*=record)
 1715          *      0       n       n       --      (1)
 1716          *      0       y       n       --      (2)
 1717          *      0       n       y       --      (3) * STALE
 1718          *      0       y       y       n       (4) *
 1719          *      0       y       y       y       (5) * STALE
 1720          *      1       --      n       --      (6)   NOSTATE(= PASSIVE)
 1721          *      1       --      y       --      (7) * STALE
 1722          */
 1723 
 1724         if (lladdr) {           /* (3-5) and (7) */
 1725                 /*
 1726                  * Record source link-layer address
 1727                  * XXX is it dependent to ifp->if_type?
 1728                  */
 1729                 sdl->sdl_alen = ifp->if_addrlen;
 1730                 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
 1731         }
 1732 
 1733         if (!is_newentry) {
 1734                 if ((!olladdr && lladdr)                /* (3) */
 1735                  || (olladdr && lladdr && llchange)) {  /* (5) */
 1736                         do_update = 1;
 1737                         newstate = ND6_LLINFO_STALE;
 1738                 } else                                  /* (1-2,4) */
 1739                         do_update = 0;
 1740         } else {
 1741                 do_update = 1;
 1742                 if (!lladdr)                            /* (6) */
 1743                         newstate = ND6_LLINFO_NOSTATE;
 1744                 else                                    /* (7) */
 1745                         newstate = ND6_LLINFO_STALE;
 1746         }
 1747 
 1748         if (do_update) {
 1749                 /*
 1750                  * Update the state of the neighbor cache.
 1751                  */
 1752                 ln->ln_state = newstate;
 1753 
 1754                 if (ln->ln_state == ND6_LLINFO_STALE) {
 1755                         /*
 1756                          * XXX: since nd6_output() below will cause
 1757                          * state tansition to DELAY and reset the timer,
 1758                          * we must set the timer now, although it is actually
 1759                          * meaningless.
 1760                          */
 1761                         ln->ln_expire = time_second + nd6_gctimer;
 1762 
 1763                         if (ln->ln_hold) {
 1764                                 /*
 1765                                  * we assume ifp is not a p2p here, so just
 1766                                  * set the 2nd argument as the 1st one.
 1767                                  */
 1768                                 nd6_output(ifp, ifp, ln->ln_hold,
 1769                                            (struct sockaddr_in6 *)rt_key(rt),
 1770                                            rt);
 1771                                 ln->ln_hold = NULL;
 1772                         }
 1773                 } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
 1774                         /* probe right away */
 1775                         ln->ln_expire = time_second;
 1776                 }
 1777         }
 1778 
 1779         /*
 1780          * ICMP6 type dependent behavior.
 1781          *
 1782          * NS: clear IsRouter if new entry
 1783          * RS: clear IsRouter
 1784          * RA: set IsRouter if there's lladdr
 1785          * redir: clear IsRouter if new entry
 1786          *
 1787          * RA case, (1):
 1788          * The spec says that we must set IsRouter in the following cases:
 1789          * - If lladdr exist, set IsRouter.  This means (1-5).
 1790          * - If it is old entry (!newentry), set IsRouter.  This means (7).
 1791          * So, based on the spec, in (1-5) and (7) cases we must set IsRouter.
 1792          * A quetion arises for (1) case.  (1) case has no lladdr in the
 1793          * neighbor cache, this is similar to (6).
 1794          * This case is rare but we figured that we MUST NOT set IsRouter.
 1795          *
 1796          * newentry olladdr  lladdr  llchange       NS  RS  RA  redir
 1797          *                                                      D R
 1798          *      0       n       n       --      (1)     c   ?     s
 1799          *      0       y       n       --      (2)     c   s     s
 1800          *      0       n       y       --      (3)     c   s     s
 1801          *      0       y       y       n       (4)     c   s     s
 1802          *      0       y       y       y       (5)     c   s     s
 1803          *      1       --      n       --      (6) c   c       c s
 1804          *      1       --      y       --      (7) c   c   s   c s
 1805          *
 1806          *                                      (c=clear s=set)
 1807          */
 1808         switch (type & 0xff) {
 1809         case ND_NEIGHBOR_SOLICIT:
 1810                 /*
 1811                  * New entry must have is_router flag cleared.
 1812                  */
 1813                 if (is_newentry)        /* (6-7) */
 1814                         ln->ln_router = 0;
 1815                 break;
 1816         case ND_REDIRECT:
 1817                 /*
 1818                  * If the icmp is a redirect to a better router, always set the
 1819                  * is_router flag. Otherwise, if the entry is newly created,
 1820                  * clear the flag. [RFC 2461, sec 8.3]
 1821                  */
 1822                 if (code == ND_REDIRECT_ROUTER)
 1823                         ln->ln_router = 1;
 1824                 else if (is_newentry) /* (6-7) */
 1825                         ln->ln_router = 0;
 1826                 break;
 1827         case ND_ROUTER_SOLICIT:
 1828                 /*
 1829                  * is_router flag must always be cleared.
 1830                  */
 1831                 ln->ln_router = 0;
 1832                 break;
 1833         case ND_ROUTER_ADVERT:
 1834                 /*
 1835                  * Mark an entry with lladdr as a router.
 1836                  */
 1837                 if ((!is_newentry && (olladdr || lladdr))       /* (2-5) */
 1838                  || (is_newentry && lladdr)) {                  /* (7) */
 1839                         ln->ln_router = 1;
 1840                 }
 1841                 break;
 1842         }
 1843 
 1844         /*
 1845          * When the link-layer address of a router changes, select the
 1846          * best router again.  In particular, when the neighbor entry is newly
 1847          * created, it might affect the selection policy.
 1848          * Question: can we restrict the first condition to the "is_newentry"
 1849          * case?
 1850          * XXX: when we hear an RA from a new router with the link-layer
 1851          * address option, defrouter_select() is called twice, since
 1852          * defrtrlist_update called the function as well.  However, I believe
 1853          * we can compromise the overhead, since it only happens the first
 1854          * time.
 1855          * XXX: although defrouter_select() should not have a bad effect
 1856          * for those are not autoconfigured hosts, we explicitly avoid such
 1857          * cases for safety.
 1858          */
 1859         if (do_update && ln->ln_router && !ip6_forwarding && (ip6_accept_rtadv || (ifp->if_eflags & IFEF_ACCEPT_RTADVD)))
 1860                 defrouter_select();
 1861 
 1862         return rt;
 1863 }
 1864 
 1865 static void
 1866 nd6_slowtimo(ignored_arg)
 1867     void *ignored_arg;
 1868 {
 1869         int s = splnet();
 1870         int i;
 1871         struct nd_ifinfo *nd6if;
 1872 
 1873         s = splnet();
 1874         timeout(nd6_slowtimo_funneled, (caddr_t)0, ND6_SLOWTIMER_INTERVAL * hz);
 1875         for (i = 1; i < if_index + 1; i++) {
 1876                 if (!nd_ifinfo || i >= nd_ifinfo_indexlim)
 1877                         continue;
 1878                 nd6if = &nd_ifinfo[i];
 1879                 if (nd6if->basereachable && /* already initialized */
 1880                     (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) {
 1881                         /*
 1882                          * Since reachable time rarely changes by router
 1883                          * advertisements, we SHOULD insure that a new random
 1884                          * value gets recomputed at least once every few hours.
 1885                          * (RFC 2461, 6.3.4)
 1886                          */
 1887                         nd6if->recalctm = nd6_recalc_reachtm_interval;
 1888                         nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable);
 1889                 }
 1890         }
 1891         splx(s);
 1892 }
 1893 
 1894 static void
 1895 nd6_slowtimo_funneled(ignored_arg)
 1896         void    *ignored_arg;
 1897 {
 1898 #ifdef __APPLE__
 1899         boolean_t   funnel_state;
 1900         funnel_state = thread_funnel_set(network_flock, TRUE);
 1901 #endif
 1902         nd6_slowtimo(ignored_arg);
 1903 #ifdef __APPLE__
 1904         (void) thread_funnel_set(network_flock, FALSE);
 1905 #endif
 1906 }
 1907 
 1908 #define senderr(e) { error = (e); goto bad;}
 1909 int
 1910 nd6_output(ifp, origifp, m0, dst, rt0)
 1911         struct ifnet *ifp;
 1912         struct ifnet *origifp;
 1913         struct mbuf *m0;
 1914         struct sockaddr_in6 *dst;
 1915         struct rtentry *rt0;
 1916 {
 1917         struct mbuf *m = m0;
 1918         struct rtentry *rt = rt0;
 1919         struct sockaddr_in6 *gw6 = NULL;
 1920         struct llinfo_nd6 *ln = NULL;
 1921         int error = 0;
 1922 
 1923         if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr))
 1924                 goto sendpkt;
 1925 
 1926         if (nd6_need_cache(ifp) == 0)
 1927                 goto sendpkt;
 1928 
 1929         /*
 1930          * next hop determination.  This routine is derived from ether_outpout.
 1931          */
 1932         if (rt) {
 1933                 if ((rt->rt_flags & RTF_UP) == 0) {
 1934                         if ((rt0 = rt = rtalloc1((struct sockaddr *)dst, 1, 0UL)) !=
 1935                                 NULL)
 1936                         {
 1937                                 rtunref(rt);
 1938                                 if (rt->rt_ifp != ifp) {
 1939                                         /* XXX: loop care? */
 1940                                         return nd6_output(ifp, origifp, m0,
 1941                                                           dst, rt);
 1942                                 }
 1943                         } else
 1944                                 senderr(EHOSTUNREACH);
 1945                 }
 1946 
 1947                 if (rt->rt_flags & RTF_GATEWAY) {
 1948                         gw6 = (struct sockaddr_in6 *)rt->rt_gateway;
 1949 
 1950                         /*
 1951                          * We skip link-layer address resolution and NUD
 1952                          * if the gateway is not a neighbor from ND point
 1953                          * of view, regardless of the value of nd_ifinfo.flags.
 1954                          * The second condition is a bit tricky; we skip
 1955                          * if the gateway is our own address, which is
 1956                          * sometimes used to install a route to a p2p link.
 1957                          */
 1958                         if (!nd6_is_addr_neighbor(gw6, ifp) ||
 1959                             in6ifa_ifpwithaddr(ifp, &gw6->sin6_addr)) {
 1960                                 /*
 1961                                  * We allow this kind of tricky route only
 1962                                  * when the outgoing interface is p2p.
 1963                                  * XXX: we may need a more generic rule here.
 1964                                  */
 1965                                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 1966                                         senderr(EHOSTUNREACH);
 1967 
 1968                                 goto sendpkt;
 1969                         }
 1970 
 1971                         if (rt->rt_gwroute == 0)
 1972                                 goto lookup;
 1973                         if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
 1974                                 rtfree(rt); rt = rt0;
 1975                         lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1, 0UL);
 1976                                 if ((rt = rt->rt_gwroute) == 0)
 1977                                         senderr(EHOSTUNREACH);
 1978                         }
 1979                 }
 1980         }
 1981 
 1982         /*
 1983          * Address resolution or Neighbor Unreachability Detection
 1984          * for the next hop.
 1985          * At this point, the destination of the packet must be a unicast
 1986          * or an anycast address(i.e. not a multicast).
 1987          */
 1988 
 1989         /* Look up the neighbor cache for the nexthop */
 1990         if (rt && (rt->rt_flags & RTF_LLINFO) != 0)
 1991                 ln = (struct llinfo_nd6 *)rt->rt_llinfo;
 1992         else {
 1993                 /*
 1994                  * Since nd6_is_addr_neighbor() internally calls nd6_lookup(),
 1995                  * the condition below is not very efficient.  But we believe
 1996                  * it is tolerable, because this should be a rare case.
 1997                  */
 1998                 if (nd6_is_addr_neighbor(dst, ifp) &&
 1999                     (rt = nd6_lookup(&dst->sin6_addr, 1, ifp)) != NULL)
 2000                         ln = (struct llinfo_nd6 *)rt->rt_llinfo;
 2001         }
 2002         if (!ln || !rt) {
 2003                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0 &&
 2004                     !(nd_ifinfo[ifp->if_index].flags & ND6_IFF_PERFORMNUD)) {
 2005                         log(LOG_DEBUG,
 2006                             "nd6_output: can't allocate llinfo for %s "
 2007                             "(ln=%p, rt=%p)\n",
 2008                             ip6_sprintf(&dst->sin6_addr), ln, rt);
 2009                         senderr(EIO);   /* XXX: good error? */
 2010                 }
 2011 
 2012                 goto sendpkt;   /* send anyway */
 2013         }
 2014 
 2015         /* We don't have to do link-layer address resolution on a p2p link. */
 2016         if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
 2017             ln->ln_state < ND6_LLINFO_REACHABLE) {
 2018                 ln->ln_state = ND6_LLINFO_STALE;
 2019                 ln->ln_expire = time_second + nd6_gctimer;
 2020         }
 2021 
 2022         /*
 2023          * The first time we send a packet to a neighbor whose entry is
 2024          * STALE, we have to change the state to DELAY and a sets a timer to
 2025          * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do
 2026          * neighbor unreachability detection on expiration.
 2027          * (RFC 2461 7.3.3)
 2028          */
 2029         if (ln->ln_state == ND6_LLINFO_STALE) {
 2030                 ln->ln_asked = 0;
 2031                 ln->ln_state = ND6_LLINFO_DELAY;
 2032                 ln->ln_expire = time_second + nd6_delay;
 2033         }
 2034 
 2035         /*
 2036          * If the neighbor cache entry has a state other than INCOMPLETE
 2037          * (i.e. its link-layer address is already resolved), just
 2038          * send the packet.
 2039          */
 2040         if (ln->ln_state > ND6_LLINFO_INCOMPLETE)
 2041                 goto sendpkt;
 2042 
 2043         /*
 2044          * There is a neighbor cache entry, but no ethernet address
 2045          * response yet.  Replace the held mbuf (if any) with this
 2046          * latest one.
 2047          *
 2048          * This code conforms to the rate-limiting rule described in Section
 2049          * 7.2.2 of RFC 2461, because the timer is set correctly after sending
 2050          * an NS below.
 2051          */
 2052         if (ln->ln_state == ND6_LLINFO_NOSTATE)
 2053                 ln->ln_state = ND6_LLINFO_INCOMPLETE;
 2054         if (ln->ln_hold)
 2055                 m_freem(ln->ln_hold);
 2056         ln->ln_hold = m;
 2057         if (ln->ln_expire) {
 2058                 if (ln->ln_asked < nd6_mmaxtries &&
 2059                     ln->ln_expire < time_second) {
 2060                         ln->ln_asked++;
 2061                         ln->ln_expire = time_second +
 2062                                 nd_ifinfo[ifp->if_index].retrans / 1000;
 2063                         nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0);
 2064                 }
 2065         }
 2066         return(0);
 2067         
 2068   sendpkt:
 2069 #ifdef __APPLE__
 2070 
 2071         /* Make sure the HW checksum flags are cleaned before sending the packet */
 2072 
 2073         m->m_pkthdr.csum_data = 0;
 2074         m->m_pkthdr.csum_flags = 0;
 2075 
 2076         if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
 2077                 m->m_pkthdr.rcvif = origifp; /* forwarding rules require the original scope_id */
 2078                 return (dlil_output(ifptodlt(origifp, PF_INET6), m, (caddr_t)rt, (struct sockaddr *)dst,0));    
 2079         }
 2080 
 2081         m->m_pkthdr.rcvif = (struct ifnet *)0;
 2082         return (dlil_output(ifptodlt(ifp, PF_INET6), m, (caddr_t)rt, (struct sockaddr *)dst, 0));
 2083 #else
 2084         if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
 2085                 return((*ifp->if_output)(origifp, m, (struct sockaddr *)dst,
 2086                                          rt));
 2087         }
 2088         return((*ifp->if_output)(ifp, m, (struct sockaddr *)dst, rt));
 2089 #endif
 2090         
 2091   bad:
 2092         if (m)
 2093                 m_freem(m);
 2094         return (error);
 2095 }       
 2096 #undef senderr
 2097 
 2098 int
 2099 nd6_need_cache(ifp)
 2100         struct ifnet *ifp;
 2101 {
 2102         /*
 2103          * XXX: we currently do not make neighbor cache on any interface
 2104          * other than ARCnet, Ethernet, FDDI and GIF.
 2105          *
 2106          * RFC2893 says:
 2107          * - unidirectional tunnels needs no ND
 2108          */
 2109         switch (ifp->if_type) {
 2110         case IFT_ARCNET:
 2111         case IFT_ETHER:
 2112         case IFT_FDDI:
 2113         case IFT_IEEE1394:
 2114 #if IFT_L2VLAN
 2115         case IFT_L2VLAN:
 2116 #endif
 2117 #if IFT_IEEE80211
 2118         case IFT_IEEE80211:
 2119 #endif
 2120         case IFT_GIF:           /* XXX need more cases? */
 2121                 return(1);
 2122         default:
 2123                 return(0);
 2124         }
 2125 }
 2126 
 2127 int
 2128 nd6_storelladdr(ifp, rt, m, dst, desten)
 2129         struct ifnet *ifp;
 2130         struct rtentry *rt;
 2131         struct mbuf *m;
 2132         struct sockaddr *dst;
 2133         u_char *desten;
 2134 {
 2135         int i;
 2136         struct sockaddr_dl *sdl;
 2137 
 2138         if (m->m_flags & M_MCAST) {
 2139                 switch (ifp->if_type) {
 2140                 case IFT_ETHER:
 2141                 case IFT_FDDI:
 2142 #if IFT_L2VLAN
 2143         case IFT_L2VLAN:
 2144 #endif
 2145 #if IFT_IEEE80211
 2146                 case IFT_IEEE80211:
 2147 #endif
 2148                         ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr,
 2149                                                  desten);
 2150                         return(1);
 2151                 case IFT_IEEE1394:
 2152                         for (i = 0; i < ifp->if_addrlen; i++)
 2153                                 desten[i] = ~0;
 2154                         return(1);
 2155                 case IFT_ARCNET:
 2156                         *desten = 0;
 2157                         return(1);
 2158                 default:
 2159                         return(0); /* caller will free mbuf */
 2160                 }
 2161         }
 2162 
 2163         if (rt == NULL) {
 2164                 /* this could happen, if we could not allocate memory */
 2165                 return(0); /* caller will free mbuf */
 2166         }
 2167         if (rt->rt_gateway->sa_family != AF_LINK) {
 2168                 printf("nd6_storelladdr: something odd happens\n");
 2169                 return(0); /* caller will free mbuf */
 2170         }
 2171         sdl = SDL(rt->rt_gateway);
 2172         if (sdl->sdl_alen == 0) {
 2173                 /* this should be impossible, but we bark here for debugging */
 2174                 printf("nd6_storelladdr: sdl_alen == 0\n");
 2175                 return(0); /* caller will free mbuf */
 2176         }
 2177 
 2178         bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
 2179         return(1);
 2180 }
 2181 #ifndef __APPLE__
 2182 static int nd6_sysctl_drlist SYSCTL_HANDLER_ARGS;
 2183 static int nd6_sysctl_prlist SYSCTL_HANDLER_ARGS;
 2184 SYSCTL_DECL(_net_inet6_icmp6);
 2185 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
 2186         CTLFLAG_RD, nd6_sysctl_drlist, "");
 2187 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist,
 2188         CTLFLAG_RD, nd6_sysctl_prlist, "");
 2189 
 2190 static int
 2191 nd6_sysctl_drlist SYSCTL_HANDLER_ARGS 
 2192 {
 2193         int error;
 2194         char buf[1024];
 2195         struct in6_defrouter *d, *de;
 2196         struct nd_defrouter *dr;
 2197 
 2198         if (req->newptr)
 2199                 return EPERM;
 2200         error = 0;
 2201 
 2202         for (dr = TAILQ_FIRST(&nd_defrouter);
 2203              dr;
 2204              dr = TAILQ_NEXT(dr, dr_entry)) {
 2205                 d = (struct in6_defrouter *)buf;
 2206                 de = (struct in6_defrouter *)(buf + sizeof(buf));
 2207 
 2208                 if (d + 1 <= de) {
 2209                         bzero(d, sizeof(*d));
 2210                         d->rtaddr.sin6_family = AF_INET6;
 2211                         d->rtaddr.sin6_len = sizeof(d->rtaddr);
 2212                         if (in6_recoverscope(&d->rtaddr, &dr->rtaddr,
 2213                             dr->ifp) != 0)
 2214                                 log(LOG_ERR,
 2215                                     "scope error in "
 2216                                     "default router list (%s)\n",
 2217                                     ip6_sprintf(&dr->rtaddr));
 2218                         d->flags = dr->flags;
 2219                         d->rtlifetime = dr->rtlifetime;
 2220                         d->expire = dr->expire;
 2221                         d->if_index = dr->ifp->if_index;
 2222                 } else
 2223                         panic("buffer too short");
 2224 
 2225                 error = SYSCTL_OUT(req, buf, sizeof(*d));
 2226                 if (error)
 2227                         break;
 2228         }
 2229         return error;
 2230 }
 2231 
 2232 static int
 2233 nd6_sysctl_prlist SYSCTL_HANDLER_ARGS 
 2234 {
 2235         int error;
 2236         char buf[1024];
 2237         struct in6_prefix *p, *pe;
 2238         struct nd_prefix *pr;
 2239 
 2240         if (req->newptr)
 2241                 return EPERM;
 2242         error = 0;
 2243 
 2244         for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 2245                 u_short advrtrs;
 2246                 size_t advance;
 2247                 struct sockaddr_in6 *sin6, *s6;
 2248                 struct nd_pfxrouter *pfr;
 2249 
 2250                 p = (struct in6_prefix *)buf;
 2251                 pe = (struct in6_prefix *)(buf + sizeof(buf));
 2252 
 2253                 if (p + 1 <= pe) {
 2254                         bzero(p, sizeof(*p));
 2255                         sin6 = (struct sockaddr_in6 *)(p + 1);
 2256 
 2257                         p->prefix = pr->ndpr_prefix;
 2258                         if (in6_recoverscope(&p->prefix,
 2259                             &p->prefix.sin6_addr, pr->ndpr_ifp) != 0)
 2260                                 log(LOG_ERR,
 2261                                     "scope error in prefix list (%s)\n",
 2262                                     ip6_sprintf(&p->prefix.sin6_addr));
 2263                         p->raflags = pr->ndpr_raf;
 2264                         p->prefixlen = pr->ndpr_plen;
 2265                         p->vltime = pr->ndpr_vltime;
 2266                         p->pltime = pr->ndpr_pltime;
 2267                         p->if_index = pr->ndpr_ifp->if_index;
 2268                         p->expire = pr->ndpr_expire;
 2269                         p->refcnt = pr->ndpr_refcnt;
 2270                         p->flags = pr->ndpr_stateflags;
 2271                         p->origin = PR_ORIG_RA;
 2272                         advrtrs = 0;
 2273                         for (pfr = pr->ndpr_advrtrs.lh_first;
 2274                              pfr;
 2275                              pfr = pfr->pfr_next) {
 2276                                 if ((void *)&sin6[advrtrs + 1] >
 2277                                     (void *)pe) {
 2278                                         advrtrs++;
 2279                                         continue;
 2280                                 }
 2281                                 s6 = &sin6[advrtrs];
 2282                                 bzero(s6, sizeof(*s6));
 2283                                 s6->sin6_family = AF_INET6;
 2284                                 s6->sin6_len = sizeof(*sin6);
 2285                                 if (in6_recoverscope(s6,
 2286                                     &pfr->router->rtaddr,
 2287                                     pfr->router->ifp) != 0)
 2288                                         log(LOG_ERR,
 2289                                             "scope error in "
 2290                                             "prefix list (%s)\n",
 2291                                             ip6_sprintf(&pfr->router->rtaddr));
 2292                                 advrtrs++;
 2293                         }
 2294                         p->advrtrs = advrtrs;
 2295                 } else 
 2296                         panic("buffer too short");
 2297 
 2298                 advance = sizeof(*p) + sizeof(*sin6) * advrtrs;
 2299                 error = SYSCTL_OUT(req, buf, advance);
 2300                 if (error)
 2301                         break;
 2302         }
 2303         return error;
 2304 }
 2305 #endif

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