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

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    1 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $KAME: nd6.c,v 1.144 2001/05/24 07:44:00 itojun Exp $
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: stable/9/sys/netinet6/nd6.c 281869 2015-04-22 20:48:56Z ae $");
   34 
   35 #include "opt_inet.h"
   36 #include "opt_inet6.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/callout.h>
   41 #include <sys/malloc.h>
   42 #include <sys/mbuf.h>
   43 #include <sys/socket.h>
   44 #include <sys/sockio.h>
   45 #include <sys/time.h>
   46 #include <sys/kernel.h>
   47 #include <sys/protosw.h>
   48 #include <sys/errno.h>
   49 #include <sys/syslog.h>
   50 #include <sys/lock.h>
   51 #include <sys/rwlock.h>
   52 #include <sys/queue.h>
   53 #include <sys/sysctl.h>
   54 
   55 #include <net/if.h>
   56 #include <net/if_arc.h>
   57 #include <net/if_dl.h>
   58 #include <net/if_types.h>
   59 #include <net/iso88025.h>
   60 #include <net/fddi.h>
   61 #include <net/route.h>
   62 #include <net/vnet.h>
   63 
   64 #include <netinet/in.h>
   65 #include <net/if_llatbl.h>
   66 #define L3_ADDR_SIN6(le)        ((struct sockaddr_in6 *) L3_ADDR(le))
   67 #include <netinet/if_ether.h>
   68 #include <netinet6/in6_var.h>
   69 #include <netinet/ip6.h>
   70 #include <netinet6/ip6_var.h>
   71 #include <netinet6/scope6_var.h>
   72 #include <netinet6/nd6.h>
   73 #include <netinet6/in6_ifattach.h>
   74 #include <netinet/icmp6.h>
   75 #include <netinet6/send.h>
   76 
   77 #include <sys/limits.h>
   78 
   79 #include <security/mac/mac_framework.h>
   80 
   81 #define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */
   82 #define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */
   83 
   84 #define SIN6(s) ((struct sockaddr_in6 *)s)
   85 
   86 /* timer values */
   87 VNET_DEFINE(int, nd6_prune)     = 1;    /* walk list every 1 seconds */
   88 VNET_DEFINE(int, nd6_delay)     = 5;    /* delay first probe time 5 second */
   89 VNET_DEFINE(int, nd6_umaxtries) = 3;    /* maximum unicast query */
   90 VNET_DEFINE(int, nd6_mmaxtries) = 3;    /* maximum multicast query */
   91 VNET_DEFINE(int, nd6_useloopback) = 1;  /* use loopback interface for
   92                                          * local traffic */
   93 VNET_DEFINE(int, nd6_gctimer)   = (60 * 60 * 24); /* 1 day: garbage
   94                                          * collection timer */
   95 
   96 /* preventing too many loops in ND option parsing */
   97 static VNET_DEFINE(int, nd6_maxndopt) = 10; /* max # of ND options allowed */
   98 
   99 VNET_DEFINE(int, nd6_maxnudhint) = 0;   /* max # of subsequent upper
  100                                          * layer hints */
  101 static VNET_DEFINE(int, nd6_maxqueuelen) = 1; /* max pkts cached in unresolved
  102                                          * ND entries */
  103 #define V_nd6_maxndopt                  VNET(nd6_maxndopt)
  104 #define V_nd6_maxqueuelen               VNET(nd6_maxqueuelen)
  105 
  106 #ifdef ND6_DEBUG
  107 VNET_DEFINE(int, nd6_debug) = 1;
  108 #else
  109 VNET_DEFINE(int, nd6_debug) = 0;
  110 #endif
  111 
  112 /* for debugging? */
  113 #if 0
  114 static int nd6_inuse, nd6_allocated;
  115 #endif
  116 
  117 VNET_DEFINE(struct nd_drhead, nd_defrouter);
  118 VNET_DEFINE(struct nd_prhead, nd_prefix);
  119 
  120 VNET_DEFINE(int, nd6_recalc_reachtm_interval) = ND6_RECALC_REACHTM_INTERVAL;
  121 #define V_nd6_recalc_reachtm_interval   VNET(nd6_recalc_reachtm_interval)
  122 
  123 static struct sockaddr_in6 all1_sa;
  124 
  125 int     (*send_sendso_input_hook)(struct mbuf *, struct ifnet *, int, int);
  126 
  127 static int nd6_is_new_addr_neighbor(struct sockaddr_in6 *,
  128         struct ifnet *);
  129 static void nd6_setmtu0(struct ifnet *, struct nd_ifinfo *);
  130 static void nd6_slowtimo(void *);
  131 static int regen_tmpaddr(struct in6_ifaddr *);
  132 static struct llentry *nd6_free(struct llentry *, int);
  133 static void nd6_llinfo_timer(void *);
  134 static void clear_llinfo_pqueue(struct llentry *);
  135 
  136 static VNET_DEFINE(struct callout, nd6_slowtimo_ch);
  137 #define V_nd6_slowtimo_ch               VNET(nd6_slowtimo_ch)
  138 
  139 VNET_DEFINE(struct callout, nd6_timer_ch);
  140 
  141 void
  142 nd6_init(void)
  143 {
  144         int i;
  145 
  146         LIST_INIT(&V_nd_prefix);
  147 
  148         all1_sa.sin6_family = AF_INET6;
  149         all1_sa.sin6_len = sizeof(struct sockaddr_in6);
  150         for (i = 0; i < sizeof(all1_sa.sin6_addr); i++)
  151                 all1_sa.sin6_addr.s6_addr[i] = 0xff;
  152 
  153         /* initialization of the default router list */
  154         TAILQ_INIT(&V_nd_defrouter);
  155 
  156         /* start timer */
  157         callout_init(&V_nd6_slowtimo_ch, 0);
  158         callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
  159             nd6_slowtimo, curvnet);
  160 }
  161 
  162 #ifdef VIMAGE
  163 void
  164 nd6_destroy()
  165 {
  166 
  167         callout_drain(&V_nd6_slowtimo_ch);
  168         callout_drain(&V_nd6_timer_ch);
  169 }
  170 #endif
  171 
  172 struct nd_ifinfo *
  173 nd6_ifattach(struct ifnet *ifp)
  174 {
  175         struct nd_ifinfo *nd;
  176 
  177         nd = (struct nd_ifinfo *)malloc(sizeof(*nd), M_IP6NDP, M_WAITOK|M_ZERO);
  178         nd->initialized = 1;
  179 
  180         nd->chlim = IPV6_DEFHLIM;
  181         nd->basereachable = REACHABLE_TIME;
  182         nd->reachable = ND_COMPUTE_RTIME(nd->basereachable);
  183         nd->retrans = RETRANS_TIMER;
  184 
  185         nd->flags = ND6_IFF_PERFORMNUD;
  186 
  187         /* A loopback interface always has ND6_IFF_AUTO_LINKLOCAL.
  188          * XXXHRS: Clear ND6_IFF_AUTO_LINKLOCAL on an IFT_BRIDGE interface by
  189          * default regardless of the V_ip6_auto_linklocal configuration to
  190          * give a reasonable default behavior.
  191          */
  192         if ((V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) ||
  193             (ifp->if_flags & IFF_LOOPBACK))
  194                 nd->flags |= ND6_IFF_AUTO_LINKLOCAL;
  195         /*
  196          * A loopback interface does not need to accept RTADV.
  197          * XXXHRS: Clear ND6_IFF_ACCEPT_RTADV on an IFT_BRIDGE interface by
  198          * default regardless of the V_ip6_accept_rtadv configuration to
  199          * prevent the interface from accepting RA messages arrived
  200          * on one of the member interfaces with ND6_IFF_ACCEPT_RTADV.
  201          */
  202         if (V_ip6_accept_rtadv &&
  203             !(ifp->if_flags & IFF_LOOPBACK) &&
  204             (ifp->if_type != IFT_BRIDGE))
  205                         nd->flags |= ND6_IFF_ACCEPT_RTADV;
  206         if (V_ip6_no_radr && !(ifp->if_flags & IFF_LOOPBACK))
  207                 nd->flags |= ND6_IFF_NO_RADR;
  208 
  209         /* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */
  210         nd6_setmtu0(ifp, nd);
  211 
  212         return nd;
  213 }
  214 
  215 void
  216 nd6_ifdetach(struct nd_ifinfo *nd)
  217 {
  218 
  219         free(nd, M_IP6NDP);
  220 }
  221 
  222 /*
  223  * Reset ND level link MTU. This function is called when the physical MTU
  224  * changes, which means we might have to adjust the ND level MTU.
  225  */
  226 void
  227 nd6_setmtu(struct ifnet *ifp)
  228 {
  229 
  230         nd6_setmtu0(ifp, ND_IFINFO(ifp));
  231 }
  232 
  233 /* XXX todo: do not maintain copy of ifp->if_mtu in ndi->maxmtu */
  234 void
  235 nd6_setmtu0(struct ifnet *ifp, struct nd_ifinfo *ndi)
  236 {
  237         u_int32_t omaxmtu;
  238 
  239         omaxmtu = ndi->maxmtu;
  240 
  241         switch (ifp->if_type) {
  242         case IFT_ARCNET:
  243                 ndi->maxmtu = MIN(ARC_PHDS_MAXMTU, ifp->if_mtu); /* RFC2497 */
  244                 break;
  245         case IFT_FDDI:
  246                 ndi->maxmtu = MIN(FDDIIPMTU, ifp->if_mtu); /* RFC2467 */
  247                 break;
  248         case IFT_ISO88025:
  249                  ndi->maxmtu = MIN(ISO88025_MAX_MTU, ifp->if_mtu);
  250                  break;
  251         default:
  252                 ndi->maxmtu = ifp->if_mtu;
  253                 break;
  254         }
  255 
  256         /*
  257          * Decreasing the interface MTU under IPV6 minimum MTU may cause
  258          * undesirable situation.  We thus notify the operator of the change
  259          * explicitly.  The check for omaxmtu is necessary to restrict the
  260          * log to the case of changing the MTU, not initializing it.
  261          */
  262         if (omaxmtu >= IPV6_MMTU && ndi->maxmtu < IPV6_MMTU) {
  263                 log(LOG_NOTICE, "nd6_setmtu0: "
  264                     "new link MTU on %s (%lu) is too small for IPv6\n",
  265                     if_name(ifp), (unsigned long)ndi->maxmtu);
  266         }
  267 
  268         if (ndi->maxmtu > V_in6_maxmtu)
  269                 in6_setmaxmtu(); /* check all interfaces just in case */
  270 
  271 }
  272 
  273 void
  274 nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts)
  275 {
  276 
  277         bzero(ndopts, sizeof(*ndopts));
  278         ndopts->nd_opts_search = (struct nd_opt_hdr *)opt;
  279         ndopts->nd_opts_last
  280                 = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len);
  281 
  282         if (icmp6len == 0) {
  283                 ndopts->nd_opts_done = 1;
  284                 ndopts->nd_opts_search = NULL;
  285         }
  286 }
  287 
  288 /*
  289  * Take one ND option.
  290  */
  291 struct nd_opt_hdr *
  292 nd6_option(union nd_opts *ndopts)
  293 {
  294         struct nd_opt_hdr *nd_opt;
  295         int olen;
  296 
  297         KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__));
  298         KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts",
  299             __func__));
  300         if (ndopts->nd_opts_search == NULL)
  301                 return NULL;
  302         if (ndopts->nd_opts_done)
  303                 return NULL;
  304 
  305         nd_opt = ndopts->nd_opts_search;
  306 
  307         /* make sure nd_opt_len is inside the buffer */
  308         if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) {
  309                 bzero(ndopts, sizeof(*ndopts));
  310                 return NULL;
  311         }
  312 
  313         olen = nd_opt->nd_opt_len << 3;
  314         if (olen == 0) {
  315                 /*
  316                  * Message validation requires that all included
  317                  * options have a length that is greater than zero.
  318                  */
  319                 bzero(ndopts, sizeof(*ndopts));
  320                 return NULL;
  321         }
  322 
  323         ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen);
  324         if (ndopts->nd_opts_search > ndopts->nd_opts_last) {
  325                 /* option overruns the end of buffer, invalid */
  326                 bzero(ndopts, sizeof(*ndopts));
  327                 return NULL;
  328         } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) {
  329                 /* reached the end of options chain */
  330                 ndopts->nd_opts_done = 1;
  331                 ndopts->nd_opts_search = NULL;
  332         }
  333         return nd_opt;
  334 }
  335 
  336 /*
  337  * Parse multiple ND options.
  338  * This function is much easier to use, for ND routines that do not need
  339  * multiple options of the same type.
  340  */
  341 int
  342 nd6_options(union nd_opts *ndopts)
  343 {
  344         struct nd_opt_hdr *nd_opt;
  345         int i = 0;
  346 
  347         KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__));
  348         KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts",
  349             __func__));
  350         if (ndopts->nd_opts_search == NULL)
  351                 return 0;
  352 
  353         while (1) {
  354                 nd_opt = nd6_option(ndopts);
  355                 if (nd_opt == NULL && ndopts->nd_opts_last == NULL) {
  356                         /*
  357                          * Message validation requires that all included
  358                          * options have a length that is greater than zero.
  359                          */
  360                         ICMP6STAT_INC(icp6s_nd_badopt);
  361                         bzero(ndopts, sizeof(*ndopts));
  362                         return -1;
  363                 }
  364 
  365                 if (nd_opt == NULL)
  366                         goto skip1;
  367 
  368                 switch (nd_opt->nd_opt_type) {
  369                 case ND_OPT_SOURCE_LINKADDR:
  370                 case ND_OPT_TARGET_LINKADDR:
  371                 case ND_OPT_MTU:
  372                 case ND_OPT_REDIRECTED_HEADER:
  373                         if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
  374                                 nd6log((LOG_INFO,
  375                                     "duplicated ND6 option found (type=%d)\n",
  376                                     nd_opt->nd_opt_type));
  377                                 /* XXX bark? */
  378                         } else {
  379                                 ndopts->nd_opt_array[nd_opt->nd_opt_type]
  380                                         = nd_opt;
  381                         }
  382                         break;
  383                 case ND_OPT_PREFIX_INFORMATION:
  384                         if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) {
  385                                 ndopts->nd_opt_array[nd_opt->nd_opt_type]
  386                                         = nd_opt;
  387                         }
  388                         ndopts->nd_opts_pi_end =
  389                                 (struct nd_opt_prefix_info *)nd_opt;
  390                         break;
  391                 /* What about ND_OPT_ROUTE_INFO? RFC 4191 */
  392                 case ND_OPT_RDNSS:      /* RFC 6106 */
  393                 case ND_OPT_DNSSL:      /* RFC 6106 */
  394                         /*
  395                          * Silently ignore options we know and do not care about
  396                          * in the kernel.
  397                          */
  398                         break;
  399                 default:
  400                         /*
  401                          * Unknown options must be silently ignored,
  402                          * to accomodate future extension to the protocol.
  403                          */
  404                         nd6log((LOG_DEBUG,
  405                             "nd6_options: unsupported option %d - "
  406                             "option ignored\n", nd_opt->nd_opt_type));
  407                 }
  408 
  409 skip1:
  410                 i++;
  411                 if (i > V_nd6_maxndopt) {
  412                         ICMP6STAT_INC(icp6s_nd_toomanyopt);
  413                         nd6log((LOG_INFO, "too many loop in nd opt\n"));
  414                         break;
  415                 }
  416 
  417                 if (ndopts->nd_opts_done)
  418                         break;
  419         }
  420 
  421         return 0;
  422 }
  423 
  424 /*
  425  * ND6 timer routine to handle ND6 entries
  426  */
  427 void
  428 nd6_llinfo_settimer_locked(struct llentry *ln, long tick)
  429 {
  430         int canceled;
  431 
  432         LLE_WLOCK_ASSERT(ln);
  433 
  434         if (tick < 0) {
  435                 ln->la_expire = 0;
  436                 ln->ln_ntick = 0;
  437                 canceled = callout_stop(&ln->ln_timer_ch);
  438         } else {
  439                 ln->la_expire = time_second + tick / hz;
  440                 LLE_ADDREF(ln);
  441                 if (tick > INT_MAX) {
  442                         ln->ln_ntick = tick - INT_MAX;
  443                         canceled = callout_reset(&ln->ln_timer_ch, INT_MAX,
  444                             nd6_llinfo_timer, ln);
  445                 } else {
  446                         ln->ln_ntick = 0;
  447                         canceled = callout_reset(&ln->ln_timer_ch, tick,
  448                             nd6_llinfo_timer, ln);
  449                 }
  450         }
  451         if (canceled)
  452                 LLE_REMREF(ln);
  453 }
  454 
  455 void
  456 nd6_llinfo_settimer(struct llentry *ln, long tick)
  457 {
  458 
  459         LLE_WLOCK(ln);
  460         nd6_llinfo_settimer_locked(ln, tick);
  461         LLE_WUNLOCK(ln);
  462 }
  463 
  464 static void
  465 nd6_llinfo_timer(void *arg)
  466 {
  467         struct llentry *ln;
  468         struct in6_addr *dst;
  469         struct ifnet *ifp;
  470         struct nd_ifinfo *ndi = NULL;
  471 
  472         KASSERT(arg != NULL, ("%s: arg NULL", __func__));
  473         ln = (struct llentry *)arg;
  474         LLE_WLOCK_ASSERT(ln);
  475         ifp = ln->lle_tbl->llt_ifp;
  476 
  477         CURVNET_SET(ifp->if_vnet);
  478 
  479         if (ln->ln_ntick > 0) {
  480                 if (ln->ln_ntick > INT_MAX) {
  481                         ln->ln_ntick -= INT_MAX;
  482                         nd6_llinfo_settimer_locked(ln, INT_MAX);
  483                 } else {
  484                         ln->ln_ntick = 0;
  485                         nd6_llinfo_settimer_locked(ln, ln->ln_ntick);
  486                 }
  487                 goto done;
  488         }
  489 
  490         ndi = ND_IFINFO(ifp);
  491         dst = &L3_ADDR_SIN6(ln)->sin6_addr;
  492         if (ln->la_flags & LLE_STATIC) {
  493                 goto done;
  494         }
  495 
  496         if (ln->la_flags & LLE_DELETED) {
  497                 (void)nd6_free(ln, 0);
  498                 ln = NULL;
  499                 goto done;
  500         }
  501 
  502         switch (ln->ln_state) {
  503         case ND6_LLINFO_INCOMPLETE:
  504                 if (ln->la_asked < V_nd6_mmaxtries) {
  505                         ln->la_asked++;
  506                         nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
  507                         LLE_WUNLOCK(ln);
  508                         nd6_ns_output(ifp, NULL, dst, ln, 0);
  509                         LLE_WLOCK(ln);
  510                 } else {
  511                         struct mbuf *m = ln->la_hold;
  512                         if (m) {
  513                                 struct mbuf *m0;
  514 
  515                                 /*
  516                                  * assuming every packet in la_hold has the
  517                                  * same IP header.  Send error after unlock.
  518                                  */
  519                                 m0 = m->m_nextpkt;
  520                                 m->m_nextpkt = NULL;
  521                                 ln->la_hold = m0;
  522                                 clear_llinfo_pqueue(ln);
  523                         }
  524                         EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_TIMEDOUT);
  525                         (void)nd6_free(ln, 0);
  526                         ln = NULL;
  527                         if (m != NULL)
  528                                 icmp6_error2(m, ICMP6_DST_UNREACH,
  529                                     ICMP6_DST_UNREACH_ADDR, 0, ifp);
  530                 }
  531                 break;
  532         case ND6_LLINFO_REACHABLE:
  533                 if (!ND6_LLINFO_PERMANENT(ln)) {
  534                         ln->ln_state = ND6_LLINFO_STALE;
  535                         nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
  536                 }
  537                 break;
  538 
  539         case ND6_LLINFO_STALE:
  540                 /* Garbage Collection(RFC 2461 5.3) */
  541                 if (!ND6_LLINFO_PERMANENT(ln)) {
  542                         EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_EXPIRED);
  543                         (void)nd6_free(ln, 1);
  544                         ln = NULL;
  545                 }
  546                 break;
  547 
  548         case ND6_LLINFO_DELAY:
  549                 if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) {
  550                         /* We need NUD */
  551                         ln->la_asked = 1;
  552                         ln->ln_state = ND6_LLINFO_PROBE;
  553                         nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
  554                         LLE_WUNLOCK(ln);
  555                         nd6_ns_output(ifp, dst, dst, ln, 0);
  556                         LLE_WLOCK(ln);
  557                 } else {
  558                         ln->ln_state = ND6_LLINFO_STALE; /* XXX */
  559                         nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
  560                 }
  561                 break;
  562         case ND6_LLINFO_PROBE:
  563                 if (ln->la_asked < V_nd6_umaxtries) {
  564                         ln->la_asked++;
  565                         nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
  566                         LLE_WUNLOCK(ln);
  567                         nd6_ns_output(ifp, dst, dst, ln, 0);
  568                         LLE_WLOCK(ln);
  569                 } else {
  570                         EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_EXPIRED);
  571                         (void)nd6_free(ln, 0);
  572                         ln = NULL;
  573                 }
  574                 break;
  575         default:
  576                 panic("%s: paths in a dark night can be confusing: %d",
  577                     __func__, ln->ln_state);
  578         }
  579 done:
  580         if (ln != NULL)
  581                 LLE_FREE_LOCKED(ln);
  582         CURVNET_RESTORE();
  583 }
  584 
  585 
  586 /*
  587  * ND6 timer routine to expire default route list and prefix list
  588  */
  589 void
  590 nd6_timer(void *arg)
  591 {
  592         CURVNET_SET((struct vnet *) arg);
  593         int s;
  594         struct nd_defrouter *dr, *ndr;
  595         struct nd_prefix *pr, *npr;
  596         struct in6_ifaddr *ia6, *nia6;
  597 
  598         callout_reset(&V_nd6_timer_ch, V_nd6_prune * hz,
  599             nd6_timer, curvnet);
  600 
  601         /* expire default router list */
  602         s = splnet();
  603         TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
  604                 if (dr->expire && dr->expire < time_second)
  605                         defrtrlist_del(dr);
  606         }
  607 
  608         /*
  609          * expire interface addresses.
  610          * in the past the loop was inside prefix expiry processing.
  611          * However, from a stricter speci-confrmance standpoint, we should
  612          * rather separate address lifetimes and prefix lifetimes.
  613          *
  614          * XXXRW: in6_ifaddrhead locking.
  615          */
  616   addrloop:
  617         TAILQ_FOREACH_SAFE(ia6, &V_in6_ifaddrhead, ia_link, nia6) {
  618                 /* check address lifetime */
  619                 if (IFA6_IS_INVALID(ia6)) {
  620                         int regen = 0;
  621 
  622                         /*
  623                          * If the expiring address is temporary, try
  624                          * regenerating a new one.  This would be useful when
  625                          * we suspended a laptop PC, then turned it on after a
  626                          * period that could invalidate all temporary
  627                          * addresses.  Although we may have to restart the
  628                          * loop (see below), it must be after purging the
  629                          * address.  Otherwise, we'd see an infinite loop of
  630                          * regeneration.
  631                          */
  632                         if (V_ip6_use_tempaddr &&
  633                             (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
  634                                 if (regen_tmpaddr(ia6) == 0)
  635                                         regen = 1;
  636                         }
  637 
  638                         in6_purgeaddr(&ia6->ia_ifa);
  639 
  640                         if (regen)
  641                                 goto addrloop; /* XXX: see below */
  642                 } else if (IFA6_IS_DEPRECATED(ia6)) {
  643                         int oldflags = ia6->ia6_flags;
  644 
  645                         ia6->ia6_flags |= IN6_IFF_DEPRECATED;
  646 
  647                         /*
  648                          * If a temporary address has just become deprecated,
  649                          * regenerate a new one if possible.
  650                          */
  651                         if (V_ip6_use_tempaddr &&
  652                             (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
  653                             (oldflags & IN6_IFF_DEPRECATED) == 0) {
  654 
  655                                 if (regen_tmpaddr(ia6) == 0) {
  656                                         /*
  657                                          * A new temporary address is
  658                                          * generated.
  659                                          * XXX: this means the address chain
  660                                          * has changed while we are still in
  661                                          * the loop.  Although the change
  662                                          * would not cause disaster (because
  663                                          * it's not a deletion, but an
  664                                          * addition,) we'd rather restart the
  665                                          * loop just for safety.  Or does this
  666                                          * significantly reduce performance??
  667                                          */
  668                                         goto addrloop;
  669                                 }
  670                         }
  671                 } else {
  672                         /*
  673                          * A new RA might have made a deprecated address
  674                          * preferred.
  675                          */
  676                         ia6->ia6_flags &= ~IN6_IFF_DEPRECATED;
  677                 }
  678         }
  679 
  680         /* expire prefix list */
  681         LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
  682                 /*
  683                  * check prefix lifetime.
  684                  * since pltime is just for autoconf, pltime processing for
  685                  * prefix is not necessary.
  686                  */
  687                 if (pr->ndpr_vltime != ND6_INFINITE_LIFETIME &&
  688                     time_second - pr->ndpr_lastupdate > pr->ndpr_vltime) {
  689 
  690                         /*
  691                          * address expiration and prefix expiration are
  692                          * separate.  NEVER perform in6_purgeaddr here.
  693                          */
  694                         prelist_remove(pr);
  695                 }
  696         }
  697         splx(s);
  698         CURVNET_RESTORE();
  699 }
  700 
  701 /*
  702  * ia6 - deprecated/invalidated temporary address
  703  */
  704 static int
  705 regen_tmpaddr(struct in6_ifaddr *ia6)
  706 {
  707         struct ifaddr *ifa;
  708         struct ifnet *ifp;
  709         struct in6_ifaddr *public_ifa6 = NULL;
  710 
  711         ifp = ia6->ia_ifa.ifa_ifp;
  712         IF_ADDR_RLOCK(ifp);
  713         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  714                 struct in6_ifaddr *it6;
  715 
  716                 if (ifa->ifa_addr->sa_family != AF_INET6)
  717                         continue;
  718 
  719                 it6 = (struct in6_ifaddr *)ifa;
  720 
  721                 /* ignore no autoconf addresses. */
  722                 if ((it6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
  723                         continue;
  724 
  725                 /* ignore autoconf addresses with different prefixes. */
  726                 if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr)
  727                         continue;
  728 
  729                 /*
  730                  * Now we are looking at an autoconf address with the same
  731                  * prefix as ours.  If the address is temporary and is still
  732                  * preferred, do not create another one.  It would be rare, but
  733                  * could happen, for example, when we resume a laptop PC after
  734                  * a long period.
  735                  */
  736                 if ((it6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
  737                     !IFA6_IS_DEPRECATED(it6)) {
  738                         public_ifa6 = NULL;
  739                         break;
  740                 }
  741 
  742                 /*
  743                  * This is a public autoconf address that has the same prefix
  744                  * as ours.  If it is preferred, keep it.  We can't break the
  745                  * loop here, because there may be a still-preferred temporary
  746                  * address with the prefix.
  747                  */
  748                 if (!IFA6_IS_DEPRECATED(it6))
  749                     public_ifa6 = it6;
  750 
  751                 if (public_ifa6 != NULL)
  752                         ifa_ref(&public_ifa6->ia_ifa);
  753         }
  754         IF_ADDR_RUNLOCK(ifp);
  755 
  756         if (public_ifa6 != NULL) {
  757                 int e;
  758 
  759                 if ((e = in6_tmpifadd(public_ifa6, 0, 0)) != 0) {
  760                         ifa_free(&public_ifa6->ia_ifa);
  761                         log(LOG_NOTICE, "regen_tmpaddr: failed to create a new"
  762                             " tmp addr,errno=%d\n", e);
  763                         return (-1);
  764                 }
  765                 ifa_free(&public_ifa6->ia_ifa);
  766                 return (0);
  767         }
  768 
  769         return (-1);
  770 }
  771 
  772 /*
  773  * Nuke neighbor cache/prefix/default router management table, right before
  774  * ifp goes away.
  775  */
  776 void
  777 nd6_purge(struct ifnet *ifp)
  778 {
  779         struct nd_defrouter *dr, *ndr;
  780         struct nd_prefix *pr, *npr;
  781 
  782         /*
  783          * Nuke default router list entries toward ifp.
  784          * We defer removal of default router list entries that is installed
  785          * in the routing table, in order to keep additional side effects as
  786          * small as possible.
  787          */
  788         TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
  789                 if (dr->installed)
  790                         continue;
  791 
  792                 if (dr->ifp == ifp)
  793                         defrtrlist_del(dr);
  794         }
  795 
  796         TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
  797                 if (!dr->installed)
  798                         continue;
  799 
  800                 if (dr->ifp == ifp)
  801                         defrtrlist_del(dr);
  802         }
  803 
  804         /* Nuke prefix list entries toward ifp */
  805         LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
  806                 if (pr->ndpr_ifp == ifp) {
  807                         /*
  808                          * Because if_detach() does *not* release prefixes
  809                          * while purging addresses the reference count will
  810                          * still be above zero. We therefore reset it to
  811                          * make sure that the prefix really gets purged.
  812                          */
  813                         pr->ndpr_refcnt = 0;
  814 
  815                         /*
  816                          * Previously, pr->ndpr_addr is removed as well,
  817                          * but I strongly believe we don't have to do it.
  818                          * nd6_purge() is only called from in6_ifdetach(),
  819                          * which removes all the associated interface addresses
  820                          * by itself.
  821                          * (jinmei@kame.net 20010129)
  822                          */
  823                         prelist_remove(pr);
  824                 }
  825         }
  826 
  827         /* cancel default outgoing interface setting */
  828         if (V_nd6_defifindex == ifp->if_index)
  829                 nd6_setdefaultiface(0);
  830 
  831         if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
  832                 /* Refresh default router list. */
  833                 defrouter_select();
  834         }
  835 
  836         /* XXXXX
  837          * We do not nuke the neighbor cache entries here any more
  838          * because the neighbor cache is kept in if_afdata[AF_INET6].
  839          * nd6_purge() is invoked by in6_ifdetach() which is called
  840          * from if_detach() where everything gets purged. So let
  841          * in6_domifdetach() do the actual L2 table purging work.
  842          */
  843 }
  844 
  845 /* 
  846  * the caller acquires and releases the lock on the lltbls
  847  * Returns the llentry locked
  848  */
  849 struct llentry *
  850 nd6_lookup(struct in6_addr *addr6, int flags, struct ifnet *ifp)
  851 {
  852         struct sockaddr_in6 sin6;
  853         struct llentry *ln;
  854         int llflags;
  855         
  856         bzero(&sin6, sizeof(sin6));
  857         sin6.sin6_len = sizeof(struct sockaddr_in6);
  858         sin6.sin6_family = AF_INET6;
  859         sin6.sin6_addr = *addr6;
  860 
  861         IF_AFDATA_LOCK_ASSERT(ifp);
  862 
  863         llflags = 0;
  864         if (flags & ND6_CREATE)
  865             llflags |= LLE_CREATE;
  866         if (flags & ND6_EXCLUSIVE)
  867             llflags |= LLE_EXCLUSIVE;   
  868         
  869         ln = lla_lookup(LLTABLE6(ifp), llflags, (struct sockaddr *)&sin6);
  870         if ((ln != NULL) && (llflags & LLE_CREATE))
  871                 ln->ln_state = ND6_LLINFO_NOSTATE;
  872         
  873         return (ln);
  874 }
  875 
  876 /*
  877  * Test whether a given IPv6 address is a neighbor or not, ignoring
  878  * the actual neighbor cache.  The neighbor cache is ignored in order
  879  * to not reenter the routing code from within itself.
  880  */
  881 static int
  882 nd6_is_new_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp)
  883 {
  884         struct nd_prefix *pr;
  885         struct ifaddr *dstaddr;
  886 
  887         /*
  888          * A link-local address is always a neighbor.
  889          * XXX: a link does not necessarily specify a single interface.
  890          */
  891         if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr)) {
  892                 struct sockaddr_in6 sin6_copy;
  893                 u_int32_t zone;
  894 
  895                 /*
  896                  * We need sin6_copy since sa6_recoverscope() may modify the
  897                  * content (XXX).
  898                  */
  899                 sin6_copy = *addr;
  900                 if (sa6_recoverscope(&sin6_copy))
  901                         return (0); /* XXX: should be impossible */
  902                 if (in6_setscope(&sin6_copy.sin6_addr, ifp, &zone))
  903                         return (0);
  904                 if (sin6_copy.sin6_scope_id == zone)
  905                         return (1);
  906                 else
  907                         return (0);
  908         }
  909 
  910         /*
  911          * If the address matches one of our addresses,
  912          * it should be a neighbor.
  913          * If the address matches one of our on-link prefixes, it should be a
  914          * neighbor.
  915          */
  916         LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
  917                 if (pr->ndpr_ifp != ifp)
  918                         continue;
  919 
  920                 if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) {
  921                         struct rtentry *rt;
  922 
  923                         /* Always use the default FIB here. */
  924                         rt = in6_rtalloc1((struct sockaddr *)&pr->ndpr_prefix,
  925                             0, 0, RT_DEFAULT_FIB);
  926                         if (rt == NULL)
  927                                 continue;
  928                         /*
  929                          * This is the case where multiple interfaces
  930                          * have the same prefix, but only one is installed 
  931                          * into the routing table and that prefix entry
  932                          * is not the one being examined here. In the case
  933                          * where RADIX_MPATH is enabled, multiple route
  934                          * entries (of the same rt_key value) will be 
  935                          * installed because the interface addresses all
  936                          * differ.
  937                          */
  938                         if (!IN6_ARE_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
  939                                &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr)) {
  940                                 RTFREE_LOCKED(rt);
  941                                 continue;
  942                         }
  943                         RTFREE_LOCKED(rt);
  944                 }
  945 
  946                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
  947                     &addr->sin6_addr, &pr->ndpr_mask))
  948                         return (1);
  949         }
  950 
  951         /*
  952          * If the address is assigned on the node of the other side of
  953          * a p2p interface, the address should be a neighbor.
  954          */
  955         dstaddr = ifa_ifwithdstaddr((struct sockaddr *)addr);
  956         if (dstaddr != NULL) {
  957                 if (dstaddr->ifa_ifp == ifp) {
  958                         ifa_free(dstaddr);
  959                         return (1);
  960                 }
  961                 ifa_free(dstaddr);
  962         }
  963 
  964         /*
  965          * If the default router list is empty, all addresses are regarded
  966          * as on-link, and thus, as a neighbor.
  967          */
  968         if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV &&
  969             TAILQ_EMPTY(&V_nd_defrouter) &&
  970             V_nd6_defifindex == ifp->if_index) {
  971                 return (1);
  972         }
  973 
  974         return (0);
  975 }
  976 
  977 
  978 /*
  979  * Detect if a given IPv6 address identifies a neighbor on a given link.
  980  * XXX: should take care of the destination of a p2p link?
  981  */
  982 int
  983 nd6_is_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp)
  984 {
  985         struct llentry *lle;
  986         int rc = 0;
  987 
  988         IF_AFDATA_UNLOCK_ASSERT(ifp);
  989         if (nd6_is_new_addr_neighbor(addr, ifp))
  990                 return (1);
  991 
  992         /*
  993          * Even if the address matches none of our addresses, it might be
  994          * in the neighbor cache.
  995          */
  996         IF_AFDATA_RLOCK(ifp);
  997         if ((lle = nd6_lookup(&addr->sin6_addr, 0, ifp)) != NULL) {
  998                 LLE_RUNLOCK(lle);
  999                 rc = 1;
 1000         }
 1001         IF_AFDATA_RUNLOCK(ifp);
 1002         return (rc);
 1003 }
 1004 
 1005 /*
 1006  * Free an nd6 llinfo entry.
 1007  * Since the function would cause significant changes in the kernel, DO NOT
 1008  * make it global, unless you have a strong reason for the change, and are sure
 1009  * that the change is safe.
 1010  */
 1011 static struct llentry *
 1012 nd6_free(struct llentry *ln, int gc)
 1013 {
 1014         struct llentry *next;
 1015         struct nd_defrouter *dr;
 1016         struct ifnet *ifp;
 1017 
 1018         LLE_WLOCK_ASSERT(ln);
 1019 
 1020         /*
 1021          * we used to have pfctlinput(PRC_HOSTDEAD) here.
 1022          * even though it is not harmful, it was not really necessary.
 1023          */
 1024 
 1025         /* cancel timer */
 1026         nd6_llinfo_settimer_locked(ln, -1);
 1027 
 1028         ifp = ln->lle_tbl->llt_ifp;
 1029 
 1030         if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
 1031                 dr = defrouter_lookup(&L3_ADDR_SIN6(ln)->sin6_addr, ifp);
 1032 
 1033                 if (dr != NULL && dr->expire &&
 1034                     ln->ln_state == ND6_LLINFO_STALE && gc) {
 1035                         /*
 1036                          * If the reason for the deletion is just garbage
 1037                          * collection, and the neighbor is an active default
 1038                          * router, do not delete it.  Instead, reset the GC
 1039                          * timer using the router's lifetime.
 1040                          * Simply deleting the entry would affect default
 1041                          * router selection, which is not necessarily a good
 1042                          * thing, especially when we're using router preference
 1043                          * values.
 1044                          * XXX: the check for ln_state would be redundant,
 1045                          *      but we intentionally keep it just in case.
 1046                          */
 1047                         if (dr->expire > time_second)
 1048                                 nd6_llinfo_settimer_locked(ln,
 1049                                     (dr->expire - time_second) * hz);
 1050                         else
 1051                                 nd6_llinfo_settimer_locked(ln,
 1052                                     (long)V_nd6_gctimer * hz);
 1053 
 1054                         next = LIST_NEXT(ln, lle_next);
 1055                         LLE_REMREF(ln);
 1056                         LLE_WUNLOCK(ln);
 1057                         return (next);
 1058                 }
 1059 
 1060                 if (dr) {
 1061                         /*
 1062                          * Unreachablity of a router might affect the default
 1063                          * router selection and on-link detection of advertised
 1064                          * prefixes.
 1065                          */
 1066 
 1067                         /*
 1068                          * Temporarily fake the state to choose a new default
 1069                          * router and to perform on-link determination of
 1070                          * prefixes correctly.
 1071                          * Below the state will be set correctly,
 1072                          * or the entry itself will be deleted.
 1073                          */
 1074                         ln->ln_state = ND6_LLINFO_INCOMPLETE;
 1075                 }
 1076 
 1077                 if (ln->ln_router || dr) {
 1078 
 1079                         /*
 1080                          * We need to unlock to avoid a LOR with rt6_flush() with the
 1081                          * rnh and for the calls to pfxlist_onlink_check() and
 1082                          * defrouter_select() in the block further down for calls
 1083                          * into nd6_lookup().  We still hold a ref.
 1084                          */
 1085                         LLE_WUNLOCK(ln);
 1086 
 1087                         /*
 1088                          * rt6_flush must be called whether or not the neighbor
 1089                          * is in the Default Router List.
 1090                          * See a corresponding comment in nd6_na_input().
 1091                          */
 1092                         rt6_flush(&L3_ADDR_SIN6(ln)->sin6_addr, ifp);
 1093                 }
 1094 
 1095                 if (dr) {
 1096                         /*
 1097                          * Since defrouter_select() does not affect the
 1098                          * on-link determination and MIP6 needs the check
 1099                          * before the default router selection, we perform
 1100                          * the check now.
 1101                          */
 1102                         pfxlist_onlink_check();
 1103 
 1104                         /*
 1105                          * Refresh default router list.
 1106                          */
 1107                         defrouter_select();
 1108                 }
 1109 
 1110                 if (ln->ln_router || dr)
 1111                         LLE_WLOCK(ln);
 1112         }
 1113 
 1114         /*
 1115          * Before deleting the entry, remember the next entry as the
 1116          * return value.  We need this because pfxlist_onlink_check() above
 1117          * might have freed other entries (particularly the old next entry) as
 1118          * a side effect (XXX).
 1119          */
 1120         next = LIST_NEXT(ln, lle_next);
 1121 
 1122         /*
 1123          * Save to unlock. We still hold an extra reference and will not
 1124          * free(9) in llentry_free() if someone else holds one as well.
 1125          */
 1126         LLE_WUNLOCK(ln);
 1127         IF_AFDATA_LOCK(ifp);
 1128         LLE_WLOCK(ln);
 1129 
 1130         /* Guard against race with other llentry_free(). */
 1131         if (ln->la_flags & LLE_LINKED) {
 1132                 LLE_REMREF(ln);
 1133                 llentry_free(ln);
 1134         } else
 1135                 LLE_FREE_LOCKED(ln);
 1136 
 1137         IF_AFDATA_UNLOCK(ifp);
 1138 
 1139         return (next);
 1140 }
 1141 
 1142 /*
 1143  * Upper-layer reachability hint for Neighbor Unreachability Detection.
 1144  *
 1145  * XXX cost-effective methods?
 1146  */
 1147 void
 1148 nd6_nud_hint(struct rtentry *rt, struct in6_addr *dst6, int force)
 1149 {
 1150         struct llentry *ln;
 1151         struct ifnet *ifp;
 1152 
 1153         if ((dst6 == NULL) || (rt == NULL))
 1154                 return;
 1155 
 1156         ifp = rt->rt_ifp;
 1157         IF_AFDATA_RLOCK(ifp);
 1158         ln = nd6_lookup(dst6, ND6_EXCLUSIVE, NULL);
 1159         IF_AFDATA_RUNLOCK(ifp);
 1160         if (ln == NULL)
 1161                 return;
 1162 
 1163         if (ln->ln_state < ND6_LLINFO_REACHABLE)
 1164                 goto done;
 1165 
 1166         /*
 1167          * if we get upper-layer reachability confirmation many times,
 1168          * it is possible we have false information.
 1169          */
 1170         if (!force) {
 1171                 ln->ln_byhint++;
 1172                 if (ln->ln_byhint > V_nd6_maxnudhint) {
 1173                         goto done;
 1174                 }
 1175         }
 1176 
 1177         ln->ln_state = ND6_LLINFO_REACHABLE;
 1178         if (!ND6_LLINFO_PERMANENT(ln)) {
 1179                 nd6_llinfo_settimer_locked(ln,
 1180                     (long)ND_IFINFO(rt->rt_ifp)->reachable * hz);
 1181         }
 1182 done:
 1183         LLE_WUNLOCK(ln);
 1184 }
 1185 
 1186 
 1187 /*
 1188  * Rejuvenate this function for routing operations related
 1189  * processing.
 1190  */
 1191 void
 1192 nd6_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info)
 1193 {
 1194         struct sockaddr_in6 *gateway;
 1195         struct nd_defrouter *dr;
 1196         struct ifnet *ifp;
 1197 
 1198         RT_LOCK_ASSERT(rt);
 1199         gateway = (struct sockaddr_in6 *)rt->rt_gateway;
 1200         ifp = rt->rt_ifp;
 1201 
 1202         switch (req) {
 1203         case RTM_ADD:
 1204                 break;
 1205 
 1206         case RTM_DELETE:
 1207                 if (!ifp)
 1208                         return;
 1209                 /*
 1210                  * Only indirect routes are interesting.
 1211                  */
 1212                 if ((rt->rt_flags & RTF_GATEWAY) == 0)
 1213                         return;
 1214                 /*
 1215                  * check for default route
 1216                  */
 1217                 if (IN6_ARE_ADDR_EQUAL(&in6addr_any, 
 1218                                        &SIN6(rt_key(rt))->sin6_addr)) {
 1219 
 1220                         dr = defrouter_lookup(&gateway->sin6_addr, ifp);
 1221                         if (dr != NULL)
 1222                                 dr->installed = 0;
 1223                 }
 1224                 break;
 1225         }
 1226 }
 1227 
 1228 
 1229 int
 1230 nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp)
 1231 {
 1232         struct in6_drlist *drl = (struct in6_drlist *)data;
 1233         struct in6_oprlist *oprl = (struct in6_oprlist *)data;
 1234         struct in6_ndireq *ndi = (struct in6_ndireq *)data;
 1235         struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data;
 1236         struct in6_ndifreq *ndif = (struct in6_ndifreq *)data;
 1237         struct nd_defrouter *dr;
 1238         struct nd_prefix *pr;
 1239         int i = 0, error = 0;
 1240         int s;
 1241 
 1242         switch (cmd) {
 1243         case SIOCGDRLST_IN6:
 1244                 /*
 1245                  * obsolete API, use sysctl under net.inet6.icmp6
 1246                  */
 1247                 bzero(drl, sizeof(*drl));
 1248                 s = splnet();
 1249                 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
 1250                         if (i >= DRLSTSIZ)
 1251                                 break;
 1252                         drl->defrouter[i].rtaddr = dr->rtaddr;
 1253                         in6_clearscope(&drl->defrouter[i].rtaddr);
 1254 
 1255                         drl->defrouter[i].flags = dr->flags;
 1256                         drl->defrouter[i].rtlifetime = dr->rtlifetime;
 1257                         drl->defrouter[i].expire = dr->expire;
 1258                         drl->defrouter[i].if_index = dr->ifp->if_index;
 1259                         i++;
 1260                 }
 1261                 splx(s);
 1262                 break;
 1263         case SIOCGPRLST_IN6:
 1264                 /*
 1265                  * obsolete API, use sysctl under net.inet6.icmp6
 1266                  *
 1267                  * XXX the structure in6_prlist was changed in backward-
 1268                  * incompatible manner.  in6_oprlist is used for SIOCGPRLST_IN6,
 1269                  * in6_prlist is used for nd6_sysctl() - fill_prlist().
 1270                  */
 1271                 /*
 1272                  * XXX meaning of fields, especialy "raflags", is very
 1273                  * differnet between RA prefix list and RR/static prefix list.
 1274                  * how about separating ioctls into two?
 1275                  */
 1276                 bzero(oprl, sizeof(*oprl));
 1277                 s = splnet();
 1278                 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
 1279                         struct nd_pfxrouter *pfr;
 1280                         int j;
 1281 
 1282                         if (i >= PRLSTSIZ)
 1283                                 break;
 1284                         oprl->prefix[i].prefix = pr->ndpr_prefix.sin6_addr;
 1285                         oprl->prefix[i].raflags = pr->ndpr_raf;
 1286                         oprl->prefix[i].prefixlen = pr->ndpr_plen;
 1287                         oprl->prefix[i].vltime = pr->ndpr_vltime;
 1288                         oprl->prefix[i].pltime = pr->ndpr_pltime;
 1289                         oprl->prefix[i].if_index = pr->ndpr_ifp->if_index;
 1290                         if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME)
 1291                                 oprl->prefix[i].expire = 0;
 1292                         else {
 1293                                 time_t maxexpire;
 1294 
 1295                                 /* XXX: we assume time_t is signed. */
 1296                                 maxexpire = (-1) &
 1297                                     ~((time_t)1 <<
 1298                                     ((sizeof(maxexpire) * 8) - 1));
 1299                                 if (pr->ndpr_vltime <
 1300                                     maxexpire - pr->ndpr_lastupdate) {
 1301                                         oprl->prefix[i].expire =
 1302                                             pr->ndpr_lastupdate +
 1303                                             pr->ndpr_vltime;
 1304                                 } else
 1305                                         oprl->prefix[i].expire = maxexpire;
 1306                         }
 1307 
 1308                         j = 0;
 1309                         LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) {
 1310                                 if (j < DRLSTSIZ) {
 1311 #define RTRADDR oprl->prefix[i].advrtr[j]
 1312                                         RTRADDR = pfr->router->rtaddr;
 1313                                         in6_clearscope(&RTRADDR);
 1314 #undef RTRADDR
 1315                                 }
 1316                                 j++;
 1317                         }
 1318                         oprl->prefix[i].advrtrs = j;
 1319                         oprl->prefix[i].origin = PR_ORIG_RA;
 1320 
 1321                         i++;
 1322                 }
 1323                 splx(s);
 1324 
 1325                 break;
 1326         case OSIOCGIFINFO_IN6:
 1327 #define ND      ndi->ndi
 1328                 /* XXX: old ndp(8) assumes a positive value for linkmtu. */
 1329                 bzero(&ND, sizeof(ND));
 1330                 ND.linkmtu = IN6_LINKMTU(ifp);
 1331                 ND.maxmtu = ND_IFINFO(ifp)->maxmtu;
 1332                 ND.basereachable = ND_IFINFO(ifp)->basereachable;
 1333                 ND.reachable = ND_IFINFO(ifp)->reachable;
 1334                 ND.retrans = ND_IFINFO(ifp)->retrans;
 1335                 ND.flags = ND_IFINFO(ifp)->flags;
 1336                 ND.recalctm = ND_IFINFO(ifp)->recalctm;
 1337                 ND.chlim = ND_IFINFO(ifp)->chlim;
 1338                 break;
 1339         case SIOCGIFINFO_IN6:
 1340                 ND = *ND_IFINFO(ifp);
 1341                 break;
 1342         case SIOCSIFINFO_IN6:
 1343                 /*
 1344                  * used to change host variables from userland.
 1345                  * intented for a use on router to reflect RA configurations.
 1346                  */
 1347                 /* 0 means 'unspecified' */
 1348                 if (ND.linkmtu != 0) {
 1349                         if (ND.linkmtu < IPV6_MMTU ||
 1350                             ND.linkmtu > IN6_LINKMTU(ifp)) {
 1351                                 error = EINVAL;
 1352                                 break;
 1353                         }
 1354                         ND_IFINFO(ifp)->linkmtu = ND.linkmtu;
 1355                 }
 1356 
 1357                 if (ND.basereachable != 0) {
 1358                         int obasereachable = ND_IFINFO(ifp)->basereachable;
 1359 
 1360                         ND_IFINFO(ifp)->basereachable = ND.basereachable;
 1361                         if (ND.basereachable != obasereachable)
 1362                                 ND_IFINFO(ifp)->reachable =
 1363                                     ND_COMPUTE_RTIME(ND.basereachable);
 1364                 }
 1365                 if (ND.retrans != 0)
 1366                         ND_IFINFO(ifp)->retrans = ND.retrans;
 1367                 if (ND.chlim != 0)
 1368                         ND_IFINFO(ifp)->chlim = ND.chlim;
 1369                 /* FALLTHROUGH */
 1370         case SIOCSIFINFO_FLAGS:
 1371         {
 1372                 struct ifaddr *ifa;
 1373                 struct in6_ifaddr *ia;
 1374 
 1375                 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
 1376                     !(ND.flags & ND6_IFF_IFDISABLED)) {
 1377                         /* ifdisabled 1->0 transision */
 1378 
 1379                         /*
 1380                          * If the interface is marked as ND6_IFF_IFDISABLED and
 1381                          * has an link-local address with IN6_IFF_DUPLICATED,
 1382                          * do not clear ND6_IFF_IFDISABLED.
 1383                          * See RFC 4862, Section 5.4.5.
 1384                          */
 1385                         int duplicated_linklocal = 0;
 1386 
 1387                         IF_ADDR_RLOCK(ifp);
 1388                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1389                                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1390                                         continue;
 1391                                 ia = (struct in6_ifaddr *)ifa;
 1392                                 if ((ia->ia6_flags & IN6_IFF_DUPLICATED) &&
 1393                                     IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia))) {
 1394                                         duplicated_linklocal = 1;
 1395                                         break;
 1396                                 }
 1397                         }
 1398                         IF_ADDR_RUNLOCK(ifp);
 1399 
 1400                         if (duplicated_linklocal) {
 1401                                 ND.flags |= ND6_IFF_IFDISABLED;
 1402                                 log(LOG_ERR, "Cannot enable an interface"
 1403                                     " with a link-local address marked"
 1404                                     " duplicate.\n");
 1405                         } else {
 1406                                 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IFDISABLED;
 1407                                 if (ifp->if_flags & IFF_UP)
 1408                                         in6_if_up(ifp);
 1409                         }
 1410                 } else if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
 1411                             (ND.flags & ND6_IFF_IFDISABLED)) {
 1412                         /* ifdisabled 0->1 transision */
 1413                         /* Mark all IPv6 address as tentative. */
 1414 
 1415                         ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
 1416                         IF_ADDR_RLOCK(ifp);
 1417                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1418                                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1419                                         continue;
 1420                                 ia = (struct in6_ifaddr *)ifa;
 1421                                 ia->ia6_flags |= IN6_IFF_TENTATIVE;
 1422                         }
 1423                         IF_ADDR_RUNLOCK(ifp);
 1424                 }
 1425 
 1426                 if (ND.flags & ND6_IFF_AUTO_LINKLOCAL) {
 1427                         if (!(ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL)) {
 1428                                 /* auto_linklocal 0->1 transision */
 1429 
 1430                                 /* If no link-local address on ifp, configure */
 1431                                 ND_IFINFO(ifp)->flags |= ND6_IFF_AUTO_LINKLOCAL;
 1432                                 in6_ifattach(ifp, NULL);
 1433                         } else if (!(ND.flags & ND6_IFF_IFDISABLED) &&
 1434                             ifp->if_flags & IFF_UP) {
 1435                                 /*
 1436                                  * When the IF already has
 1437                                  * ND6_IFF_AUTO_LINKLOCAL, no link-local
 1438                                  * address is assigned, and IFF_UP, try to
 1439                                  * assign one.
 1440                                  */
 1441                                 int haslinklocal = 0;
 1442                         
 1443                                 IF_ADDR_RLOCK(ifp);
 1444                                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1445                                         if (ifa->ifa_addr->sa_family != AF_INET6)
 1446                                                 continue;
 1447                                         ia = (struct in6_ifaddr *)ifa;
 1448                                         if (IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia))) {
 1449                                                 haslinklocal = 1;
 1450                                                 break;
 1451                                         }
 1452                                 }
 1453                                 IF_ADDR_RUNLOCK(ifp);
 1454                                 if (!haslinklocal)
 1455                                         in6_ifattach(ifp, NULL);
 1456                         }
 1457                 }
 1458         }
 1459                 ND_IFINFO(ifp)->flags = ND.flags;
 1460                 break;
 1461 #undef ND
 1462         case SIOCSNDFLUSH_IN6:  /* XXX: the ioctl name is confusing... */
 1463                 /* sync kernel routing table with the default router list */
 1464                 defrouter_reset();
 1465                 defrouter_select();
 1466                 break;
 1467         case SIOCSPFXFLUSH_IN6:
 1468         {
 1469                 /* flush all the prefix advertised by routers */
 1470                 struct nd_prefix *pr, *next;
 1471 
 1472                 s = splnet();
 1473                 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, next) {
 1474                         struct in6_ifaddr *ia, *ia_next;
 1475 
 1476                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1477                                 continue; /* XXX */
 1478 
 1479                         /* do we really have to remove addresses as well? */
 1480                         /* XXXRW: in6_ifaddrhead locking. */
 1481                         TAILQ_FOREACH_SAFE(ia, &V_in6_ifaddrhead, ia_link,
 1482                             ia_next) {
 1483                                 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1484                                         continue;
 1485 
 1486                                 if (ia->ia6_ndpr == pr)
 1487                                         in6_purgeaddr(&ia->ia_ifa);
 1488                         }
 1489                         prelist_remove(pr);
 1490                 }
 1491                 splx(s);
 1492                 break;
 1493         }
 1494         case SIOCSRTRFLUSH_IN6:
 1495         {
 1496                 /* flush all the default routers */
 1497                 struct nd_defrouter *dr, *next;
 1498 
 1499                 s = splnet();
 1500                 defrouter_reset();
 1501                 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, next) {
 1502                         defrtrlist_del(dr);
 1503                 }
 1504                 defrouter_select();
 1505                 splx(s);
 1506                 break;
 1507         }
 1508         case SIOCGNBRINFO_IN6:
 1509         {
 1510                 struct llentry *ln;
 1511                 struct in6_addr nb_addr = nbi->addr; /* make local for safety */
 1512 
 1513                 if ((error = in6_setscope(&nb_addr, ifp, NULL)) != 0)
 1514                         return (error);
 1515 
 1516                 IF_AFDATA_RLOCK(ifp);
 1517                 ln = nd6_lookup(&nb_addr, 0, ifp);
 1518                 IF_AFDATA_RUNLOCK(ifp);
 1519 
 1520                 if (ln == NULL) {
 1521                         error = EINVAL;
 1522                         break;
 1523                 }
 1524                 nbi->state = ln->ln_state;
 1525                 nbi->asked = ln->la_asked;
 1526                 nbi->isrouter = ln->ln_router;
 1527                 nbi->expire = ln->la_expire;
 1528                 LLE_RUNLOCK(ln);
 1529                 break;
 1530         }
 1531         case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
 1532                 ndif->ifindex = V_nd6_defifindex;
 1533                 break;
 1534         case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
 1535                 return (nd6_setdefaultiface(ndif->ifindex));
 1536         }
 1537         return (error);
 1538 }
 1539 
 1540 /*
 1541  * Create neighbor cache entry and cache link-layer address,
 1542  * on reception of inbound ND6 packets.  (RS/RA/NS/redirect)
 1543  *
 1544  * type - ICMP6 type
 1545  * code - type dependent information
 1546  *
 1547  * XXXXX
 1548  *  The caller of this function already acquired the ndp 
 1549  *  cache table lock because the cache entry is returned.
 1550  */
 1551 struct llentry *
 1552 nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr,
 1553     int lladdrlen, int type, int code)
 1554 {
 1555         struct llentry *ln = NULL;
 1556         int is_newentry;
 1557         int do_update;
 1558         int olladdr;
 1559         int llchange;
 1560         int flags;
 1561         int newstate = 0;
 1562         uint16_t router = 0;
 1563         struct sockaddr_in6 sin6;
 1564         struct mbuf *chain = NULL;
 1565         int static_route = 0;
 1566 
 1567         IF_AFDATA_UNLOCK_ASSERT(ifp);
 1568 
 1569         KASSERT(ifp != NULL, ("%s: ifp == NULL", __func__));
 1570         KASSERT(from != NULL, ("%s: from == NULL", __func__));
 1571 
 1572         /* nothing must be updated for unspecified address */
 1573         if (IN6_IS_ADDR_UNSPECIFIED(from))
 1574                 return NULL;
 1575 
 1576         /*
 1577          * Validation about ifp->if_addrlen and lladdrlen must be done in
 1578          * the caller.
 1579          *
 1580          * XXX If the link does not have link-layer adderss, what should
 1581          * we do? (ifp->if_addrlen == 0)
 1582          * Spec says nothing in sections for RA, RS and NA.  There's small
 1583          * description on it in NS section (RFC 2461 7.2.3).
 1584          */
 1585         flags = lladdr ? ND6_EXCLUSIVE : 0;
 1586         IF_AFDATA_RLOCK(ifp);
 1587         ln = nd6_lookup(from, flags, ifp);
 1588         IF_AFDATA_RUNLOCK(ifp);
 1589         if (ln == NULL) {
 1590                 flags |= ND6_EXCLUSIVE;
 1591                 IF_AFDATA_LOCK(ifp);
 1592                 ln = nd6_lookup(from, flags | ND6_CREATE, ifp);
 1593                 IF_AFDATA_UNLOCK(ifp);
 1594                 is_newentry = 1;
 1595         } else {
 1596                 /* do nothing if static ndp is set */
 1597                 if (ln->la_flags & LLE_STATIC) {
 1598                         static_route = 1;
 1599                         goto done;
 1600                 }
 1601                 is_newentry = 0;
 1602         }
 1603         if (ln == NULL)
 1604                 return (NULL);
 1605 
 1606         olladdr = (ln->la_flags & LLE_VALID) ? 1 : 0;
 1607         if (olladdr && lladdr) {
 1608                 llchange = bcmp(lladdr, &ln->ll_addr,
 1609                     ifp->if_addrlen);
 1610         } else
 1611                 llchange = 0;
 1612 
 1613         /*
 1614          * newentry olladdr  lladdr  llchange   (*=record)
 1615          *      0       n       n       --      (1)
 1616          *      0       y       n       --      (2)
 1617          *      0       n       y       --      (3) * STALE
 1618          *      0       y       y       n       (4) *
 1619          *      0       y       y       y       (5) * STALE
 1620          *      1       --      n       --      (6)   NOSTATE(= PASSIVE)
 1621          *      1       --      y       --      (7) * STALE
 1622          */
 1623 
 1624         if (lladdr) {           /* (3-5) and (7) */
 1625                 /*
 1626                  * Record source link-layer address
 1627                  * XXX is it dependent to ifp->if_type?
 1628                  */
 1629                 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
 1630                 ln->la_flags |= LLE_VALID;
 1631                 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
 1632         }
 1633 
 1634         if (!is_newentry) {
 1635                 if ((!olladdr && lladdr != NULL) ||     /* (3) */
 1636                     (olladdr && lladdr != NULL && llchange)) {  /* (5) */
 1637                         do_update = 1;
 1638                         newstate = ND6_LLINFO_STALE;
 1639                 } else                                  /* (1-2,4) */
 1640                         do_update = 0;
 1641         } else {
 1642                 do_update = 1;
 1643                 if (lladdr == NULL)                     /* (6) */
 1644                         newstate = ND6_LLINFO_NOSTATE;
 1645                 else                                    /* (7) */
 1646                         newstate = ND6_LLINFO_STALE;
 1647         }
 1648 
 1649         if (do_update) {
 1650                 /*
 1651                  * Update the state of the neighbor cache.
 1652                  */
 1653                 ln->ln_state = newstate;
 1654 
 1655                 if (ln->ln_state == ND6_LLINFO_STALE) {
 1656                         /*
 1657                          * XXX: since nd6_output() below will cause
 1658                          * state tansition to DELAY and reset the timer,
 1659                          * we must set the timer now, although it is actually
 1660                          * meaningless.
 1661                          */
 1662                         nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
 1663 
 1664                         if (ln->la_hold) {
 1665                                 struct mbuf *m_hold, *m_hold_next;
 1666 
 1667                                 /*
 1668                                  * reset the la_hold in advance, to explicitly
 1669                                  * prevent a la_hold lookup in nd6_output()
 1670                                  * (wouldn't happen, though...)
 1671                                  */
 1672                                 for (m_hold = ln->la_hold, ln->la_hold = NULL;
 1673                                     m_hold; m_hold = m_hold_next) {
 1674                                         m_hold_next = m_hold->m_nextpkt;
 1675                                         m_hold->m_nextpkt = NULL;
 1676 
 1677                                         /*
 1678                                          * we assume ifp is not a p2p here, so
 1679                                          * just set the 2nd argument as the
 1680                                          * 1st one.
 1681                                          */
 1682                                         nd6_output_lle(ifp, ifp, m_hold, L3_ADDR_SIN6(ln), NULL, ln, &chain);
 1683                                 }
 1684                                 /*
 1685                                  * If we have mbufs in the chain we need to do
 1686                                  * deferred transmit. Copy the address from the
 1687                                  * llentry before dropping the lock down below.
 1688                                  */
 1689                                 if (chain != NULL)
 1690                                         memcpy(&sin6, L3_ADDR_SIN6(ln), sizeof(sin6));
 1691                         }
 1692                 } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
 1693                         /* probe right away */
 1694                         nd6_llinfo_settimer_locked((void *)ln, 0);
 1695                 }
 1696         }
 1697 
 1698         /*
 1699          * ICMP6 type dependent behavior.
 1700          *
 1701          * NS: clear IsRouter if new entry
 1702          * RS: clear IsRouter
 1703          * RA: set IsRouter if there's lladdr
 1704          * redir: clear IsRouter if new entry
 1705          *
 1706          * RA case, (1):
 1707          * The spec says that we must set IsRouter in the following cases:
 1708          * - If lladdr exist, set IsRouter.  This means (1-5).
 1709          * - If it is old entry (!newentry), set IsRouter.  This means (7).
 1710          * So, based on the spec, in (1-5) and (7) cases we must set IsRouter.
 1711          * A quetion arises for (1) case.  (1) case has no lladdr in the
 1712          * neighbor cache, this is similar to (6).
 1713          * This case is rare but we figured that we MUST NOT set IsRouter.
 1714          *
 1715          * newentry olladdr  lladdr  llchange       NS  RS  RA  redir
 1716          *                                                      D R
 1717          *      0       n       n       --      (1)     c   ?     s
 1718          *      0       y       n       --      (2)     c   s     s
 1719          *      0       n       y       --      (3)     c   s     s
 1720          *      0       y       y       n       (4)     c   s     s
 1721          *      0       y       y       y       (5)     c   s     s
 1722          *      1       --      n       --      (6) c   c       c s
 1723          *      1       --      y       --      (7) c   c   s   c s
 1724          *
 1725          *                                      (c=clear s=set)
 1726          */
 1727         switch (type & 0xff) {
 1728         case ND_NEIGHBOR_SOLICIT:
 1729                 /*
 1730                  * New entry must have is_router flag cleared.
 1731                  */
 1732                 if (is_newentry)        /* (6-7) */
 1733                         ln->ln_router = 0;
 1734                 break;
 1735         case ND_REDIRECT:
 1736                 /*
 1737                  * If the icmp is a redirect to a better router, always set the
 1738                  * is_router flag.  Otherwise, if the entry is newly created,
 1739                  * clear the flag.  [RFC 2461, sec 8.3]
 1740                  */
 1741                 if (code == ND_REDIRECT_ROUTER)
 1742                         ln->ln_router = 1;
 1743                 else if (is_newentry) /* (6-7) */
 1744                         ln->ln_router = 0;
 1745                 break;
 1746         case ND_ROUTER_SOLICIT:
 1747                 /*
 1748                  * is_router flag must always be cleared.
 1749                  */
 1750                 ln->ln_router = 0;
 1751                 break;
 1752         case ND_ROUTER_ADVERT:
 1753                 /*
 1754                  * Mark an entry with lladdr as a router.
 1755                  */
 1756                 if ((!is_newentry && (olladdr || lladdr)) ||    /* (2-5) */
 1757                     (is_newentry && lladdr)) {                  /* (7) */
 1758                         ln->ln_router = 1;
 1759                 }
 1760                 break;
 1761         }
 1762 
 1763         if (ln != NULL) {
 1764                 static_route = (ln->la_flags & LLE_STATIC);
 1765                 router = ln->ln_router;
 1766 
 1767                 if (flags & ND6_EXCLUSIVE)
 1768                         LLE_WUNLOCK(ln);
 1769                 else
 1770                         LLE_RUNLOCK(ln);
 1771                 if (static_route)
 1772                         ln = NULL;
 1773         }
 1774         if (chain)
 1775                 nd6_output_flush(ifp, ifp, chain, &sin6, NULL);
 1776         
 1777         /*
 1778          * When the link-layer address of a router changes, select the
 1779          * best router again.  In particular, when the neighbor entry is newly
 1780          * created, it might affect the selection policy.
 1781          * Question: can we restrict the first condition to the "is_newentry"
 1782          * case?
 1783          * XXX: when we hear an RA from a new router with the link-layer
 1784          * address option, defrouter_select() is called twice, since
 1785          * defrtrlist_update called the function as well.  However, I believe
 1786          * we can compromise the overhead, since it only happens the first
 1787          * time.
 1788          * XXX: although defrouter_select() should not have a bad effect
 1789          * for those are not autoconfigured hosts, we explicitly avoid such
 1790          * cases for safety.
 1791          */
 1792         if (do_update && router &&
 1793             ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
 1794                 /*
 1795                  * guaranteed recursion
 1796                  */
 1797                 defrouter_select();
 1798         }
 1799         
 1800         return (ln);
 1801 done:   
 1802         if (ln != NULL) {
 1803                 if (flags & ND6_EXCLUSIVE)
 1804                         LLE_WUNLOCK(ln);
 1805                 else
 1806                         LLE_RUNLOCK(ln);
 1807                 if (static_route)
 1808                         ln = NULL;
 1809         }
 1810         return (ln);
 1811 }
 1812 
 1813 static void
 1814 nd6_slowtimo(void *arg)
 1815 {
 1816         CURVNET_SET((struct vnet *) arg);
 1817         struct nd_ifinfo *nd6if;
 1818         struct ifnet *ifp;
 1819 
 1820         callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
 1821             nd6_slowtimo, curvnet);
 1822         IFNET_RLOCK_NOSLEEP();
 1823         TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
 1824                 nd6if = ND_IFINFO(ifp);
 1825                 if (nd6if->basereachable && /* already initialized */
 1826                     (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) {
 1827                         /*
 1828                          * Since reachable time rarely changes by router
 1829                          * advertisements, we SHOULD insure that a new random
 1830                          * value gets recomputed at least once every few hours.
 1831                          * (RFC 2461, 6.3.4)
 1832                          */
 1833                         nd6if->recalctm = V_nd6_recalc_reachtm_interval;
 1834                         nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable);
 1835                 }
 1836         }
 1837         IFNET_RUNLOCK_NOSLEEP();
 1838         CURVNET_RESTORE();
 1839 }
 1840 
 1841 int
 1842 nd6_output(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m0,
 1843     struct sockaddr_in6 *dst, struct rtentry *rt0)
 1844 {
 1845 
 1846         return (nd6_output_lle(ifp, origifp, m0, dst, rt0, NULL, NULL));
 1847 }
 1848 
 1849 
 1850 /*
 1851  * Note that I'm not enforcing any global serialization
 1852  * lle state or asked changes here as the logic is too
 1853  * complicated to avoid having to always acquire an exclusive
 1854  * lock
 1855  * KMM
 1856  *
 1857  */
 1858 #define senderr(e) { error = (e); goto bad;}
 1859 
 1860 int
 1861 nd6_output_lle(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m0,
 1862     struct sockaddr_in6 *dst, struct rtentry *rt0, struct llentry *lle,
 1863         struct mbuf **chain)
 1864 {
 1865         struct mbuf *m = m0;
 1866         struct m_tag *mtag;
 1867         struct llentry *ln = lle;
 1868         struct ip6_hdr *ip6;
 1869         int error = 0;
 1870         int flags = 0;
 1871         int ip6len;
 1872 
 1873 #ifdef INVARIANTS
 1874         if (lle != NULL) {
 1875                 
 1876                 LLE_WLOCK_ASSERT(lle);
 1877 
 1878                 KASSERT(chain != NULL, (" lle locked but no mbuf chain pointer passed"));
 1879         }
 1880 #endif
 1881         if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr))
 1882                 goto sendpkt;
 1883 
 1884         if (nd6_need_cache(ifp) == 0)
 1885                 goto sendpkt;
 1886 
 1887         /*
 1888          * next hop determination.  This routine is derived from ether_output.
 1889          */
 1890 
 1891         /*
 1892          * Address resolution or Neighbor Unreachability Detection
 1893          * for the next hop.
 1894          * At this point, the destination of the packet must be a unicast
 1895          * or an anycast address(i.e. not a multicast).
 1896          */
 1897 
 1898         flags = (lle != NULL) ? LLE_EXCLUSIVE : 0;
 1899         if (ln == NULL) {
 1900         retry:
 1901                 IF_AFDATA_RLOCK(ifp);
 1902                 ln = lla_lookup(LLTABLE6(ifp), flags, (struct sockaddr *)dst);
 1903                 IF_AFDATA_RUNLOCK(ifp);
 1904                 if ((ln == NULL) && nd6_is_addr_neighbor(dst, ifp))  {
 1905                         /*
 1906                          * Since nd6_is_addr_neighbor() internally calls nd6_lookup(),
 1907                          * the condition below is not very efficient.  But we believe
 1908                          * it is tolerable, because this should be a rare case.
 1909                          */
 1910                         flags = ND6_CREATE | (m ? ND6_EXCLUSIVE : 0);
 1911                         IF_AFDATA_LOCK(ifp);
 1912                         ln = nd6_lookup(&dst->sin6_addr, flags, ifp);
 1913                         IF_AFDATA_UNLOCK(ifp);
 1914                 }
 1915         } 
 1916         if (ln == NULL) {
 1917                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0 &&
 1918                     !(ND_IFINFO(ifp)->flags & ND6_IFF_PERFORMNUD)) {
 1919                         char ip6buf[INET6_ADDRSTRLEN];
 1920                         log(LOG_DEBUG,
 1921                             "nd6_output: can't allocate llinfo for %s "
 1922                             "(ln=%p)\n",
 1923                             ip6_sprintf(ip6buf, &dst->sin6_addr), ln);
 1924                         senderr(EIO);   /* XXX: good error? */
 1925                 }
 1926                 goto sendpkt;   /* send anyway */
 1927         }
 1928 
 1929         /* We don't have to do link-layer address resolution on a p2p link. */
 1930         if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
 1931             ln->ln_state < ND6_LLINFO_REACHABLE) {
 1932                 if ((flags & LLE_EXCLUSIVE) == 0) {
 1933                         flags |= LLE_EXCLUSIVE;
 1934                         LLE_RUNLOCK(ln);
 1935                         goto retry;
 1936                 }
 1937                 ln->ln_state = ND6_LLINFO_STALE;
 1938                 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
 1939         }
 1940 
 1941         /*
 1942          * The first time we send a packet to a neighbor whose entry is
 1943          * STALE, we have to change the state to DELAY and a sets a timer to
 1944          * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do
 1945          * neighbor unreachability detection on expiration.
 1946          * (RFC 2461 7.3.3)
 1947          */
 1948         if (ln->ln_state == ND6_LLINFO_STALE) {
 1949                 if ((flags & LLE_EXCLUSIVE) == 0) {
 1950                         flags |= LLE_EXCLUSIVE;
 1951                         LLE_RUNLOCK(ln);
 1952                         goto retry;
 1953                 }
 1954                 ln->la_asked = 0;
 1955                 ln->ln_state = ND6_LLINFO_DELAY;
 1956                 nd6_llinfo_settimer_locked(ln, (long)V_nd6_delay * hz);
 1957         }
 1958 
 1959         /*
 1960          * If the neighbor cache entry has a state other than INCOMPLETE
 1961          * (i.e. its link-layer address is already resolved), just
 1962          * send the packet.
 1963          */
 1964         if (ln->ln_state > ND6_LLINFO_INCOMPLETE)
 1965                 goto sendpkt;
 1966 
 1967         /*
 1968          * There is a neighbor cache entry, but no ethernet address
 1969          * response yet.  Append this latest packet to the end of the
 1970          * packet queue in the mbuf, unless the number of the packet
 1971          * does not exceed nd6_maxqueuelen.  When it exceeds nd6_maxqueuelen,
 1972          * the oldest packet in the queue will be removed.
 1973          */
 1974         if (ln->ln_state == ND6_LLINFO_NOSTATE)
 1975                 ln->ln_state = ND6_LLINFO_INCOMPLETE;
 1976 
 1977         if ((flags & LLE_EXCLUSIVE) == 0) {
 1978                 flags |= LLE_EXCLUSIVE;
 1979                 LLE_RUNLOCK(ln);
 1980                 goto retry;
 1981         }
 1982 
 1983         LLE_WLOCK_ASSERT(ln);
 1984 
 1985         if (ln->la_hold) {
 1986                 struct mbuf *m_hold;
 1987                 int i;
 1988                 
 1989                 i = 0;
 1990                 for (m_hold = ln->la_hold; m_hold; m_hold = m_hold->m_nextpkt) {
 1991                         i++;
 1992                         if (m_hold->m_nextpkt == NULL) {
 1993                                 m_hold->m_nextpkt = m;
 1994                                 break;
 1995                         }
 1996                 }
 1997                 while (i >= V_nd6_maxqueuelen) {
 1998                         m_hold = ln->la_hold;
 1999                         ln->la_hold = ln->la_hold->m_nextpkt;
 2000                         m_freem(m_hold);
 2001                         i--;
 2002                 }
 2003         } else {
 2004                 ln->la_hold = m;
 2005         }
 2006 
 2007         /*
 2008          * If there has been no NS for the neighbor after entering the
 2009          * INCOMPLETE state, send the first solicitation.
 2010          */
 2011         if (!ND6_LLINFO_PERMANENT(ln) && ln->la_asked == 0) {
 2012                 ln->la_asked++;
 2013                 
 2014                 nd6_llinfo_settimer_locked(ln,
 2015                     (long)ND_IFINFO(ifp)->retrans * hz / 1000);
 2016                 LLE_WUNLOCK(ln);
 2017                 nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0);
 2018                 if (lle != NULL && ln == lle)
 2019                         LLE_WLOCK(lle);
 2020 
 2021         } else if (lle == NULL || ln != lle) {
 2022                 /*
 2023                  * We did the lookup (no lle arg) so we
 2024                  * need to do the unlock here.
 2025                  */
 2026                 LLE_WUNLOCK(ln);
 2027         }
 2028 
 2029         return (0);
 2030 
 2031   sendpkt:
 2032         /* discard the packet if IPv6 operation is disabled on the interface */
 2033         if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) {
 2034                 error = ENETDOWN; /* better error? */
 2035                 goto bad;
 2036         }
 2037         /*
 2038          * ln is valid and the caller did not pass in 
 2039          * an llentry
 2040          */
 2041         if ((ln != NULL) && (lle == NULL)) {
 2042                 if (flags & LLE_EXCLUSIVE)
 2043                         LLE_WUNLOCK(ln);
 2044                 else
 2045                         LLE_RUNLOCK(ln);
 2046         }
 2047 
 2048 #ifdef MAC
 2049         mac_netinet6_nd6_send(ifp, m);
 2050 #endif
 2051 
 2052         /*
 2053          * If called from nd6_ns_output() (NS), nd6_na_output() (NA),
 2054          * icmp6_redirect_output() (REDIRECT) or from rip6_output() (RS, RA
 2055          * as handled by rtsol and rtadvd), mbufs will be tagged for SeND
 2056          * to be diverted to user space.  When re-injected into the kernel,
 2057          * send_output() will directly dispatch them to the outgoing interface.
 2058          */
 2059         if (send_sendso_input_hook != NULL) {
 2060                 mtag = m_tag_find(m, PACKET_TAG_ND_OUTGOING, NULL);
 2061                 if (mtag != NULL) {
 2062                         ip6 = mtod(m, struct ip6_hdr *);
 2063                         ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
 2064                         /* Use the SEND socket */
 2065                         error = send_sendso_input_hook(m, ifp, SND_OUT,
 2066                             ip6len);
 2067                         /* -1 == no app on SEND socket */
 2068                         if (error == 0 || error != -1)
 2069                             return (error);
 2070                 }
 2071         }
 2072 
 2073         /*
 2074          * We were passed in a pointer to an lle with the lock held 
 2075          * this means that we can't call if_output as we will
 2076          * recurse on the lle lock - so what we do is we create
 2077          * a list of mbufs to send and transmit them in the caller
 2078          * after the lock is dropped
 2079          */
 2080         if (lle != NULL) {
 2081                 if (*chain == NULL)
 2082                         *chain = m;
 2083                 else {
 2084                         struct mbuf *mb;
 2085 
 2086                         /*
 2087                          * append mbuf to end of deferred chain
 2088                          */
 2089                         mb = *chain;
 2090                         while (mb->m_nextpkt != NULL)
 2091                                 mb = mb->m_nextpkt;
 2092                         mb->m_nextpkt = m;
 2093                 }
 2094                 return (error);
 2095         }
 2096         /* Reset layer specific mbuf flags to avoid confusing lower layers. */
 2097         m->m_flags &= ~(M_PROTOFLAGS);  
 2098         if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
 2099                 return ((*ifp->if_output)(origifp, m, (struct sockaddr *)dst,
 2100                     NULL));
 2101         }
 2102         error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, NULL);
 2103         return (error);
 2104 
 2105   bad:
 2106         /*
 2107          * ln is valid and the caller did not pass in 
 2108          * an llentry
 2109          */
 2110         if ((ln != NULL) && (lle == NULL)) {
 2111                 if (flags & LLE_EXCLUSIVE)
 2112                         LLE_WUNLOCK(ln);
 2113                 else
 2114                         LLE_RUNLOCK(ln);
 2115         }
 2116         if (m)
 2117                 m_freem(m);
 2118         return (error);
 2119 }
 2120 #undef senderr
 2121 
 2122 
 2123 int
 2124 nd6_output_flush(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *chain,
 2125     struct sockaddr_in6 *dst, struct route *ro)
 2126 {
 2127         struct mbuf *m, *m_head;
 2128         struct ifnet *outifp;
 2129         int error = 0;
 2130 
 2131         m_head = chain;
 2132         if ((ifp->if_flags & IFF_LOOPBACK) != 0)
 2133                 outifp = origifp;
 2134         else
 2135                 outifp = ifp;
 2136         
 2137         while (m_head) {
 2138                 m = m_head;
 2139                 m_head = m_head->m_nextpkt;
 2140                 error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, ro);                         
 2141         }
 2142 
 2143         /*
 2144          * XXX
 2145          * note that intermediate errors are blindly ignored - but this is 
 2146          * the same convention as used with nd6_output when called by
 2147          * nd6_cache_lladdr
 2148          */
 2149         return (error);
 2150 }       
 2151 
 2152 
 2153 int
 2154 nd6_need_cache(struct ifnet *ifp)
 2155 {
 2156         /*
 2157          * XXX: we currently do not make neighbor cache on any interface
 2158          * other than ARCnet, Ethernet, FDDI and GIF.
 2159          *
 2160          * RFC2893 says:
 2161          * - unidirectional tunnels needs no ND
 2162          */
 2163         switch (ifp->if_type) {
 2164         case IFT_ARCNET:
 2165         case IFT_ETHER:
 2166         case IFT_FDDI:
 2167         case IFT_IEEE1394:
 2168 #ifdef IFT_L2VLAN
 2169         case IFT_L2VLAN:
 2170 #endif
 2171 #ifdef IFT_IEEE80211
 2172         case IFT_IEEE80211:
 2173 #endif
 2174 #ifdef IFT_CARP
 2175         case IFT_CARP:
 2176 #endif
 2177         case IFT_INFINIBAND:
 2178         case IFT_BRIDGE:
 2179         case IFT_PROPVIRTUAL:
 2180                 return (1);
 2181         default:
 2182                 return (0);
 2183         }
 2184 }
 2185 
 2186 /*
 2187  * the callers of this function need to be re-worked to drop
 2188  * the lle lock, drop here for now
 2189  */
 2190 int
 2191 nd6_storelladdr(struct ifnet *ifp, struct mbuf *m,
 2192     struct sockaddr *dst, u_char *desten, struct llentry **lle)
 2193 {
 2194         struct llentry *ln;
 2195 
 2196         *lle = NULL;
 2197         IF_AFDATA_UNLOCK_ASSERT(ifp);
 2198         if (m != NULL && m->m_flags & M_MCAST) {
 2199                 int i;
 2200 
 2201                 switch (ifp->if_type) {
 2202                 case IFT_ETHER:
 2203                 case IFT_FDDI:
 2204 #ifdef IFT_L2VLAN
 2205                 case IFT_L2VLAN:
 2206 #endif
 2207 #ifdef IFT_IEEE80211
 2208                 case IFT_IEEE80211:
 2209 #endif
 2210                 case IFT_BRIDGE:
 2211                 case IFT_ISO88025:
 2212                         ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr,
 2213                                                  desten);
 2214                         return (0);
 2215                 case IFT_IEEE1394:
 2216                         /*
 2217                          * netbsd can use if_broadcastaddr, but we don't do so
 2218                          * to reduce # of ifdef.
 2219                          */
 2220                         for (i = 0; i < ifp->if_addrlen; i++)
 2221                                 desten[i] = ~0;
 2222                         return (0);
 2223                 case IFT_ARCNET:
 2224                         *desten = 0;
 2225                         return (0);
 2226                 default:
 2227                         m_freem(m);
 2228                         return (EAFNOSUPPORT);
 2229                 }
 2230         }
 2231 
 2232 
 2233         /*
 2234          * the entry should have been created in nd6_store_lladdr
 2235          */
 2236         IF_AFDATA_RLOCK(ifp);
 2237         ln = lla_lookup(LLTABLE6(ifp), 0, dst);
 2238         IF_AFDATA_RUNLOCK(ifp);
 2239         if ((ln == NULL) || !(ln->la_flags & LLE_VALID)) {
 2240                 if (ln != NULL)
 2241                         LLE_RUNLOCK(ln);
 2242                 /* this could happen, if we could not allocate memory */
 2243                 m_freem(m);
 2244                 return (1);
 2245         }
 2246 
 2247         bcopy(&ln->ll_addr, desten, ifp->if_addrlen);
 2248         *lle = ln;
 2249         LLE_RUNLOCK(ln);
 2250         /*
 2251          * A *small* use after free race exists here
 2252          */
 2253         return (0);
 2254 }
 2255 
 2256 static void 
 2257 clear_llinfo_pqueue(struct llentry *ln)
 2258 {
 2259         struct mbuf *m_hold, *m_hold_next;
 2260 
 2261         for (m_hold = ln->la_hold; m_hold; m_hold = m_hold_next) {
 2262                 m_hold_next = m_hold->m_nextpkt;
 2263                 m_freem(m_hold);
 2264         }
 2265 
 2266         ln->la_hold = NULL;
 2267         return;
 2268 }
 2269 
 2270 static int nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS);
 2271 static int nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS);
 2272 #ifdef SYSCTL_DECL
 2273 SYSCTL_DECL(_net_inet6_icmp6);
 2274 #endif
 2275 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
 2276         CTLFLAG_RD, nd6_sysctl_drlist, "");
 2277 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist,
 2278         CTLFLAG_RD, nd6_sysctl_prlist, "");
 2279 SYSCTL_VNET_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXQLEN, nd6_maxqueuelen,
 2280         CTLFLAG_RW, &VNET_NAME(nd6_maxqueuelen), 1, "");
 2281 SYSCTL_VNET_INT(_net_inet6_icmp6, OID_AUTO, nd6_gctimer,
 2282         CTLFLAG_RW, &VNET_NAME(nd6_gctimer), (60 * 60 * 24), "");
 2283 
 2284 static int
 2285 nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)
 2286 {
 2287         struct in6_defrouter d;
 2288         struct nd_defrouter *dr;
 2289         int error;
 2290 
 2291         if (req->newptr)
 2292                 return (EPERM);
 2293 
 2294         bzero(&d, sizeof(d));
 2295         d.rtaddr.sin6_family = AF_INET6;
 2296         d.rtaddr.sin6_len = sizeof(d.rtaddr);
 2297 
 2298         /*
 2299          * XXX locking
 2300          */
 2301         TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
 2302                 d.rtaddr.sin6_addr = dr->rtaddr;
 2303                 error = sa6_recoverscope(&d.rtaddr);
 2304                 if (error != 0)
 2305                         return (error);
 2306                 d.flags = dr->flags;
 2307                 d.rtlifetime = dr->rtlifetime;
 2308                 d.expire = dr->expire;
 2309                 d.if_index = dr->ifp->if_index;
 2310                 error = SYSCTL_OUT(req, &d, sizeof(d));
 2311                 if (error != 0)
 2312                         return (error);
 2313         }
 2314         return (0);
 2315 }
 2316 
 2317 static int
 2318 nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS)
 2319 {
 2320         struct in6_prefix p;
 2321         struct sockaddr_in6 s6;
 2322         struct nd_prefix *pr;
 2323         struct nd_pfxrouter *pfr;
 2324         time_t maxexpire;
 2325         int error;
 2326         char ip6buf[INET6_ADDRSTRLEN];
 2327 
 2328         if (req->newptr)
 2329                 return (EPERM);
 2330 
 2331         bzero(&p, sizeof(p));
 2332         p.origin = PR_ORIG_RA;
 2333         bzero(&s6, sizeof(s6));
 2334         s6.sin6_family = AF_INET6;
 2335         s6.sin6_len = sizeof(s6);
 2336 
 2337         /*
 2338          * XXX locking
 2339          */
 2340         LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
 2341                 p.prefix = pr->ndpr_prefix;
 2342                 if (sa6_recoverscope(&p.prefix)) {
 2343                         log(LOG_ERR, "scope error in prefix list (%s)\n",
 2344                             ip6_sprintf(ip6buf, &p.prefix.sin6_addr));
 2345                         /* XXX: press on... */
 2346                 }
 2347                 p.raflags = pr->ndpr_raf;
 2348                 p.prefixlen = pr->ndpr_plen;
 2349                 p.vltime = pr->ndpr_vltime;
 2350                 p.pltime = pr->ndpr_pltime;
 2351                 p.if_index = pr->ndpr_ifp->if_index;
 2352                 if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME)
 2353                         p.expire = 0;
 2354                 else {
 2355                         /* XXX: we assume time_t is signed. */
 2356                         maxexpire = (-1) &
 2357                             ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
 2358                         if (pr->ndpr_vltime < maxexpire - pr->ndpr_lastupdate)
 2359                                 p.expire = pr->ndpr_lastupdate +
 2360                                     pr->ndpr_vltime;
 2361                         else
 2362                                 p.expire = maxexpire;
 2363                 }
 2364                 p.refcnt = pr->ndpr_refcnt;
 2365                 p.flags = pr->ndpr_stateflags;
 2366                 p.advrtrs = 0;
 2367                 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry)
 2368                         p.advrtrs++;
 2369                 error = SYSCTL_OUT(req, &p, sizeof(p));
 2370                 if (error != 0)
 2371                         return (error);
 2372                 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) {
 2373                         s6.sin6_addr = pfr->router->rtaddr;
 2374                         if (sa6_recoverscope(&s6))
 2375                                 log(LOG_ERR,
 2376                                     "scope error in prefix list (%s)\n",
 2377                                     ip6_sprintf(ip6buf, &pfr->router->rtaddr));
 2378                         error = SYSCTL_OUT(req, &s6, sizeof(s6));
 2379                         if (error != 0)
 2380                                 return (error);
 2381                 }
 2382         }
 2383         return (0);
 2384 }

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