The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/netinet6/nd6.c

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    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: releng/9.1/sys/netinet6/nd6.c 238241 2012-07-08 12:30:25Z bz $");
   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 __P((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         if (V_ip6_auto_linklocal || (ifp->if_flags & IFF_LOOPBACK))
  189                 nd->flags |= ND6_IFF_AUTO_LINKLOCAL;
  190 
  191         /* A loopback interface does not need to accept RTADV. */
  192         if (V_ip6_accept_rtadv && !(ifp->if_flags & IFF_LOOPBACK))
  193                 nd->flags |= ND6_IFF_ACCEPT_RTADV;
  194         if (V_ip6_no_radr && !(ifp->if_flags & IFF_LOOPBACK))
  195                 nd->flags |= ND6_IFF_NO_RADR;
  196 
  197         /* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */
  198         nd6_setmtu0(ifp, nd);
  199 
  200         return nd;
  201 }
  202 
  203 void
  204 nd6_ifdetach(struct nd_ifinfo *nd)
  205 {
  206 
  207         free(nd, M_IP6NDP);
  208 }
  209 
  210 /*
  211  * Reset ND level link MTU. This function is called when the physical MTU
  212  * changes, which means we might have to adjust the ND level MTU.
  213  */
  214 void
  215 nd6_setmtu(struct ifnet *ifp)
  216 {
  217 
  218         nd6_setmtu0(ifp, ND_IFINFO(ifp));
  219 }
  220 
  221 /* XXX todo: do not maintain copy of ifp->if_mtu in ndi->maxmtu */
  222 void
  223 nd6_setmtu0(struct ifnet *ifp, struct nd_ifinfo *ndi)
  224 {
  225         u_int32_t omaxmtu;
  226 
  227         omaxmtu = ndi->maxmtu;
  228 
  229         switch (ifp->if_type) {
  230         case IFT_ARCNET:
  231                 ndi->maxmtu = MIN(ARC_PHDS_MAXMTU, ifp->if_mtu); /* RFC2497 */
  232                 break;
  233         case IFT_FDDI:
  234                 ndi->maxmtu = MIN(FDDIIPMTU, ifp->if_mtu); /* RFC2467 */
  235                 break;
  236         case IFT_ISO88025:
  237                  ndi->maxmtu = MIN(ISO88025_MAX_MTU, ifp->if_mtu);
  238                  break;
  239         default:
  240                 ndi->maxmtu = ifp->if_mtu;
  241                 break;
  242         }
  243 
  244         /*
  245          * Decreasing the interface MTU under IPV6 minimum MTU may cause
  246          * undesirable situation.  We thus notify the operator of the change
  247          * explicitly.  The check for omaxmtu is necessary to restrict the
  248          * log to the case of changing the MTU, not initializing it.
  249          */
  250         if (omaxmtu >= IPV6_MMTU && ndi->maxmtu < IPV6_MMTU) {
  251                 log(LOG_NOTICE, "nd6_setmtu0: "
  252                     "new link MTU on %s (%lu) is too small for IPv6\n",
  253                     if_name(ifp), (unsigned long)ndi->maxmtu);
  254         }
  255 
  256         if (ndi->maxmtu > V_in6_maxmtu)
  257                 in6_setmaxmtu(); /* check all interfaces just in case */
  258 
  259 }
  260 
  261 void
  262 nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts)
  263 {
  264 
  265         bzero(ndopts, sizeof(*ndopts));
  266         ndopts->nd_opts_search = (struct nd_opt_hdr *)opt;
  267         ndopts->nd_opts_last
  268                 = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len);
  269 
  270         if (icmp6len == 0) {
  271                 ndopts->nd_opts_done = 1;
  272                 ndopts->nd_opts_search = NULL;
  273         }
  274 }
  275 
  276 /*
  277  * Take one ND option.
  278  */
  279 struct nd_opt_hdr *
  280 nd6_option(union nd_opts *ndopts)
  281 {
  282         struct nd_opt_hdr *nd_opt;
  283         int olen;
  284 
  285         KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__));
  286         KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts",
  287             __func__));
  288         if (ndopts->nd_opts_search == NULL)
  289                 return NULL;
  290         if (ndopts->nd_opts_done)
  291                 return NULL;
  292 
  293         nd_opt = ndopts->nd_opts_search;
  294 
  295         /* make sure nd_opt_len is inside the buffer */
  296         if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) {
  297                 bzero(ndopts, sizeof(*ndopts));
  298                 return NULL;
  299         }
  300 
  301         olen = nd_opt->nd_opt_len << 3;
  302         if (olen == 0) {
  303                 /*
  304                  * Message validation requires that all included
  305                  * options have a length that is greater than zero.
  306                  */
  307                 bzero(ndopts, sizeof(*ndopts));
  308                 return NULL;
  309         }
  310 
  311         ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen);
  312         if (ndopts->nd_opts_search > ndopts->nd_opts_last) {
  313                 /* option overruns the end of buffer, invalid */
  314                 bzero(ndopts, sizeof(*ndopts));
  315                 return NULL;
  316         } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) {
  317                 /* reached the end of options chain */
  318                 ndopts->nd_opts_done = 1;
  319                 ndopts->nd_opts_search = NULL;
  320         }
  321         return nd_opt;
  322 }
  323 
  324 /*
  325  * Parse multiple ND options.
  326  * This function is much easier to use, for ND routines that do not need
  327  * multiple options of the same type.
  328  */
  329 int
  330 nd6_options(union nd_opts *ndopts)
  331 {
  332         struct nd_opt_hdr *nd_opt;
  333         int i = 0;
  334 
  335         KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__));
  336         KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts",
  337             __func__));
  338         if (ndopts->nd_opts_search == NULL)
  339                 return 0;
  340 
  341         while (1) {
  342                 nd_opt = nd6_option(ndopts);
  343                 if (nd_opt == NULL && ndopts->nd_opts_last == NULL) {
  344                         /*
  345                          * Message validation requires that all included
  346                          * options have a length that is greater than zero.
  347                          */
  348                         ICMP6STAT_INC(icp6s_nd_badopt);
  349                         bzero(ndopts, sizeof(*ndopts));
  350                         return -1;
  351                 }
  352 
  353                 if (nd_opt == NULL)
  354                         goto skip1;
  355 
  356                 switch (nd_opt->nd_opt_type) {
  357                 case ND_OPT_SOURCE_LINKADDR:
  358                 case ND_OPT_TARGET_LINKADDR:
  359                 case ND_OPT_MTU:
  360                 case ND_OPT_REDIRECTED_HEADER:
  361                         if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
  362                                 nd6log((LOG_INFO,
  363                                     "duplicated ND6 option found (type=%d)\n",
  364                                     nd_opt->nd_opt_type));
  365                                 /* XXX bark? */
  366                         } else {
  367                                 ndopts->nd_opt_array[nd_opt->nd_opt_type]
  368                                         = nd_opt;
  369                         }
  370                         break;
  371                 case ND_OPT_PREFIX_INFORMATION:
  372                         if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) {
  373                                 ndopts->nd_opt_array[nd_opt->nd_opt_type]
  374                                         = nd_opt;
  375                         }
  376                         ndopts->nd_opts_pi_end =
  377                                 (struct nd_opt_prefix_info *)nd_opt;
  378                         break;
  379                 /* What about ND_OPT_ROUTE_INFO? RFC 4191 */
  380                 case ND_OPT_RDNSS:      /* RFC 6106 */
  381                 case ND_OPT_DNSSL:      /* RFC 6106 */
  382                         /*
  383                          * Silently ignore options we know and do not care about
  384                          * in the kernel.
  385                          */
  386                         break;
  387                 default:
  388                         /*
  389                          * Unknown options must be silently ignored,
  390                          * to accomodate future extension to the protocol.
  391                          */
  392                         nd6log((LOG_DEBUG,
  393                             "nd6_options: unsupported option %d - "
  394                             "option ignored\n", nd_opt->nd_opt_type));
  395                 }
  396 
  397 skip1:
  398                 i++;
  399                 if (i > V_nd6_maxndopt) {
  400                         ICMP6STAT_INC(icp6s_nd_toomanyopt);
  401                         nd6log((LOG_INFO, "too many loop in nd opt\n"));
  402                         break;
  403                 }
  404 
  405                 if (ndopts->nd_opts_done)
  406                         break;
  407         }
  408 
  409         return 0;
  410 }
  411 
  412 /*
  413  * ND6 timer routine to handle ND6 entries
  414  */
  415 void
  416 nd6_llinfo_settimer_locked(struct llentry *ln, long tick)
  417 {
  418         int canceled;
  419 
  420         LLE_WLOCK_ASSERT(ln);
  421 
  422         if (tick < 0) {
  423                 ln->la_expire = 0;
  424                 ln->ln_ntick = 0;
  425                 canceled = callout_stop(&ln->ln_timer_ch);
  426         } else {
  427                 ln->la_expire = time_second + tick / hz;
  428                 LLE_ADDREF(ln);
  429                 if (tick > INT_MAX) {
  430                         ln->ln_ntick = tick - INT_MAX;
  431                         canceled = callout_reset(&ln->ln_timer_ch, INT_MAX,
  432                             nd6_llinfo_timer, ln);
  433                 } else {
  434                         ln->ln_ntick = 0;
  435                         canceled = callout_reset(&ln->ln_timer_ch, tick,
  436                             nd6_llinfo_timer, ln);
  437                 }
  438         }
  439         if (canceled)
  440                 LLE_REMREF(ln);
  441 }
  442 
  443 void
  444 nd6_llinfo_settimer(struct llentry *ln, long tick)
  445 {
  446 
  447         LLE_WLOCK(ln);
  448         nd6_llinfo_settimer_locked(ln, tick);
  449         LLE_WUNLOCK(ln);
  450 }
  451 
  452 static void
  453 nd6_llinfo_timer(void *arg)
  454 {
  455         struct llentry *ln;
  456         struct in6_addr *dst;
  457         struct ifnet *ifp;
  458         struct nd_ifinfo *ndi = NULL;
  459 
  460         KASSERT(arg != NULL, ("%s: arg NULL", __func__));
  461         ln = (struct llentry *)arg;
  462         LLE_WLOCK_ASSERT(ln);
  463         ifp = ln->lle_tbl->llt_ifp;
  464 
  465         CURVNET_SET(ifp->if_vnet);
  466 
  467         if (ln->ln_ntick > 0) {
  468                 if (ln->ln_ntick > INT_MAX) {
  469                         ln->ln_ntick -= INT_MAX;
  470                         nd6_llinfo_settimer_locked(ln, INT_MAX);
  471                 } else {
  472                         ln->ln_ntick = 0;
  473                         nd6_llinfo_settimer_locked(ln, ln->ln_ntick);
  474                 }
  475                 goto done;
  476         }
  477 
  478         ndi = ND_IFINFO(ifp);
  479         dst = &L3_ADDR_SIN6(ln)->sin6_addr;
  480         if (ln->la_flags & LLE_STATIC) {
  481                 goto done;
  482         }
  483 
  484         if (ln->la_flags & LLE_DELETED) {
  485                 (void)nd6_free(ln, 0);
  486                 ln = NULL;
  487                 goto done;
  488         }
  489 
  490         switch (ln->ln_state) {
  491         case ND6_LLINFO_INCOMPLETE:
  492                 if (ln->la_asked < V_nd6_mmaxtries) {
  493                         ln->la_asked++;
  494                         nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
  495                         LLE_WUNLOCK(ln);
  496                         nd6_ns_output(ifp, NULL, dst, ln, 0);
  497                         LLE_WLOCK(ln);
  498                 } else {
  499                         struct mbuf *m = ln->la_hold;
  500                         if (m) {
  501                                 struct mbuf *m0;
  502 
  503                                 /*
  504                                  * assuming every packet in la_hold has the
  505                                  * same IP header.  Send error after unlock.
  506                                  */
  507                                 m0 = m->m_nextpkt;
  508                                 m->m_nextpkt = NULL;
  509                                 ln->la_hold = m0;
  510                                 clear_llinfo_pqueue(ln);
  511                         }
  512                         (void)nd6_free(ln, 0);
  513                         ln = NULL;
  514                         if (m != NULL)
  515                                 icmp6_error2(m, ICMP6_DST_UNREACH,
  516                                     ICMP6_DST_UNREACH_ADDR, 0, ifp);
  517                 }
  518                 break;
  519         case ND6_LLINFO_REACHABLE:
  520                 if (!ND6_LLINFO_PERMANENT(ln)) {
  521                         ln->ln_state = ND6_LLINFO_STALE;
  522                         nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
  523                 }
  524                 break;
  525 
  526         case ND6_LLINFO_STALE:
  527                 /* Garbage Collection(RFC 2461 5.3) */
  528                 if (!ND6_LLINFO_PERMANENT(ln)) {
  529                         (void)nd6_free(ln, 1);
  530                         ln = NULL;
  531                 }
  532                 break;
  533 
  534         case ND6_LLINFO_DELAY:
  535                 if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) {
  536                         /* We need NUD */
  537                         ln->la_asked = 1;
  538                         ln->ln_state = ND6_LLINFO_PROBE;
  539                         nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
  540                         LLE_WUNLOCK(ln);
  541                         nd6_ns_output(ifp, dst, dst, ln, 0);
  542                         LLE_WLOCK(ln);
  543                 } else {
  544                         ln->ln_state = ND6_LLINFO_STALE; /* XXX */
  545                         nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
  546                 }
  547                 break;
  548         case ND6_LLINFO_PROBE:
  549                 if (ln->la_asked < V_nd6_umaxtries) {
  550                         ln->la_asked++;
  551                         nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
  552                         LLE_WUNLOCK(ln);
  553                         nd6_ns_output(ifp, dst, dst, ln, 0);
  554                         LLE_WLOCK(ln);
  555                 } else {
  556                         (void)nd6_free(ln, 0);
  557                         ln = NULL;
  558                 }
  559                 break;
  560         default:
  561                 panic("%s: paths in a dark night can be confusing: %d",
  562                     __func__, ln->ln_state);
  563         }
  564 done:
  565         if (ln != NULL)
  566                 LLE_FREE_LOCKED(ln);
  567         CURVNET_RESTORE();
  568 }
  569 
  570 
  571 /*
  572  * ND6 timer routine to expire default route list and prefix list
  573  */
  574 void
  575 nd6_timer(void *arg)
  576 {
  577         CURVNET_SET((struct vnet *) arg);
  578         int s;
  579         struct nd_defrouter *dr, *ndr;
  580         struct nd_prefix *pr, *npr;
  581         struct in6_ifaddr *ia6, *nia6;
  582 
  583         callout_reset(&V_nd6_timer_ch, V_nd6_prune * hz,
  584             nd6_timer, curvnet);
  585 
  586         /* expire default router list */
  587         s = splnet();
  588         TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
  589                 if (dr->expire && dr->expire < time_second)
  590                         defrtrlist_del(dr);
  591         }
  592 
  593         /*
  594          * expire interface addresses.
  595          * in the past the loop was inside prefix expiry processing.
  596          * However, from a stricter speci-confrmance standpoint, we should
  597          * rather separate address lifetimes and prefix lifetimes.
  598          *
  599          * XXXRW: in6_ifaddrhead locking.
  600          */
  601   addrloop:
  602         TAILQ_FOREACH_SAFE(ia6, &V_in6_ifaddrhead, ia_link, nia6) {
  603                 /* check address lifetime */
  604                 if (IFA6_IS_INVALID(ia6)) {
  605                         int regen = 0;
  606 
  607                         /*
  608                          * If the expiring address is temporary, try
  609                          * regenerating a new one.  This would be useful when
  610                          * we suspended a laptop PC, then turned it on after a
  611                          * period that could invalidate all temporary
  612                          * addresses.  Although we may have to restart the
  613                          * loop (see below), it must be after purging the
  614                          * address.  Otherwise, we'd see an infinite loop of
  615                          * regeneration.
  616                          */
  617                         if (V_ip6_use_tempaddr &&
  618                             (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
  619                                 if (regen_tmpaddr(ia6) == 0)
  620                                         regen = 1;
  621                         }
  622 
  623                         in6_purgeaddr(&ia6->ia_ifa);
  624 
  625                         if (regen)
  626                                 goto addrloop; /* XXX: see below */
  627                 } else if (IFA6_IS_DEPRECATED(ia6)) {
  628                         int oldflags = ia6->ia6_flags;
  629 
  630                         ia6->ia6_flags |= IN6_IFF_DEPRECATED;
  631 
  632                         /*
  633                          * If a temporary address has just become deprecated,
  634                          * regenerate a new one if possible.
  635                          */
  636                         if (V_ip6_use_tempaddr &&
  637                             (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
  638                             (oldflags & IN6_IFF_DEPRECATED) == 0) {
  639 
  640                                 if (regen_tmpaddr(ia6) == 0) {
  641                                         /*
  642                                          * A new temporary address is
  643                                          * generated.
  644                                          * XXX: this means the address chain
  645                                          * has changed while we are still in
  646                                          * the loop.  Although the change
  647                                          * would not cause disaster (because
  648                                          * it's not a deletion, but an
  649                                          * addition,) we'd rather restart the
  650                                          * loop just for safety.  Or does this
  651                                          * significantly reduce performance??
  652                                          */
  653                                         goto addrloop;
  654                                 }
  655                         }
  656                 } else {
  657                         /*
  658                          * A new RA might have made a deprecated address
  659                          * preferred.
  660                          */
  661                         ia6->ia6_flags &= ~IN6_IFF_DEPRECATED;
  662                 }
  663         }
  664 
  665         /* expire prefix list */
  666         LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
  667                 /*
  668                  * check prefix lifetime.
  669                  * since pltime is just for autoconf, pltime processing for
  670                  * prefix is not necessary.
  671                  */
  672                 if (pr->ndpr_vltime != ND6_INFINITE_LIFETIME &&
  673                     time_second - pr->ndpr_lastupdate > pr->ndpr_vltime) {
  674 
  675                         /*
  676                          * address expiration and prefix expiration are
  677                          * separate.  NEVER perform in6_purgeaddr here.
  678                          */
  679                         prelist_remove(pr);
  680                 }
  681         }
  682         splx(s);
  683         CURVNET_RESTORE();
  684 }
  685 
  686 /*
  687  * ia6 - deprecated/invalidated temporary address
  688  */
  689 static int
  690 regen_tmpaddr(struct in6_ifaddr *ia6)
  691 {
  692         struct ifaddr *ifa;
  693         struct ifnet *ifp;
  694         struct in6_ifaddr *public_ifa6 = NULL;
  695 
  696         ifp = ia6->ia_ifa.ifa_ifp;
  697         IF_ADDR_RLOCK(ifp);
  698         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  699                 struct in6_ifaddr *it6;
  700 
  701                 if (ifa->ifa_addr->sa_family != AF_INET6)
  702                         continue;
  703 
  704                 it6 = (struct in6_ifaddr *)ifa;
  705 
  706                 /* ignore no autoconf addresses. */
  707                 if ((it6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
  708                         continue;
  709 
  710                 /* ignore autoconf addresses with different prefixes. */
  711                 if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr)
  712                         continue;
  713 
  714                 /*
  715                  * Now we are looking at an autoconf address with the same
  716                  * prefix as ours.  If the address is temporary and is still
  717                  * preferred, do not create another one.  It would be rare, but
  718                  * could happen, for example, when we resume a laptop PC after
  719                  * a long period.
  720                  */
  721                 if ((it6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
  722                     !IFA6_IS_DEPRECATED(it6)) {
  723                         public_ifa6 = NULL;
  724                         break;
  725                 }
  726 
  727                 /*
  728                  * This is a public autoconf address that has the same prefix
  729                  * as ours.  If it is preferred, keep it.  We can't break the
  730                  * loop here, because there may be a still-preferred temporary
  731                  * address with the prefix.
  732                  */
  733                 if (!IFA6_IS_DEPRECATED(it6))
  734                     public_ifa6 = it6;
  735 
  736                 if (public_ifa6 != NULL)
  737                         ifa_ref(&public_ifa6->ia_ifa);
  738         }
  739         IF_ADDR_RUNLOCK(ifp);
  740 
  741         if (public_ifa6 != NULL) {
  742                 int e;
  743 
  744                 if ((e = in6_tmpifadd(public_ifa6, 0, 0)) != 0) {
  745                         ifa_free(&public_ifa6->ia_ifa);
  746                         log(LOG_NOTICE, "regen_tmpaddr: failed to create a new"
  747                             " tmp addr,errno=%d\n", e);
  748                         return (-1);
  749                 }
  750                 ifa_free(&public_ifa6->ia_ifa);
  751                 return (0);
  752         }
  753 
  754         return (-1);
  755 }
  756 
  757 /*
  758  * Nuke neighbor cache/prefix/default router management table, right before
  759  * ifp goes away.
  760  */
  761 void
  762 nd6_purge(struct ifnet *ifp)
  763 {
  764         struct nd_defrouter *dr, *ndr;
  765         struct nd_prefix *pr, *npr;
  766 
  767         /*
  768          * Nuke default router list entries toward ifp.
  769          * We defer removal of default router list entries that is installed
  770          * in the routing table, in order to keep additional side effects as
  771          * small as possible.
  772          */
  773         TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
  774                 if (dr->installed)
  775                         continue;
  776 
  777                 if (dr->ifp == ifp)
  778                         defrtrlist_del(dr);
  779         }
  780 
  781         TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
  782                 if (!dr->installed)
  783                         continue;
  784 
  785                 if (dr->ifp == ifp)
  786                         defrtrlist_del(dr);
  787         }
  788 
  789         /* Nuke prefix list entries toward ifp */
  790         LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
  791                 if (pr->ndpr_ifp == ifp) {
  792                         /*
  793                          * Because if_detach() does *not* release prefixes
  794                          * while purging addresses the reference count will
  795                          * still be above zero. We therefore reset it to
  796                          * make sure that the prefix really gets purged.
  797                          */
  798                         pr->ndpr_refcnt = 0;
  799 
  800                         /*
  801                          * Previously, pr->ndpr_addr is removed as well,
  802                          * but I strongly believe we don't have to do it.
  803                          * nd6_purge() is only called from in6_ifdetach(),
  804                          * which removes all the associated interface addresses
  805                          * by itself.
  806                          * (jinmei@kame.net 20010129)
  807                          */
  808                         prelist_remove(pr);
  809                 }
  810         }
  811 
  812         /* cancel default outgoing interface setting */
  813         if (V_nd6_defifindex == ifp->if_index)
  814                 nd6_setdefaultiface(0);
  815 
  816         if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
  817                 /* Refresh default router list. */
  818                 defrouter_select();
  819         }
  820 
  821         /* XXXXX
  822          * We do not nuke the neighbor cache entries here any more
  823          * because the neighbor cache is kept in if_afdata[AF_INET6].
  824          * nd6_purge() is invoked by in6_ifdetach() which is called
  825          * from if_detach() where everything gets purged. So let
  826          * in6_domifdetach() do the actual L2 table purging work.
  827          */
  828 }
  829 
  830 /* 
  831  * the caller acquires and releases the lock on the lltbls
  832  * Returns the llentry locked
  833  */
  834 struct llentry *
  835 nd6_lookup(struct in6_addr *addr6, int flags, struct ifnet *ifp)
  836 {
  837         struct sockaddr_in6 sin6;
  838         struct llentry *ln;
  839         int llflags;
  840         
  841         bzero(&sin6, sizeof(sin6));
  842         sin6.sin6_len = sizeof(struct sockaddr_in6);
  843         sin6.sin6_family = AF_INET6;
  844         sin6.sin6_addr = *addr6;
  845 
  846         IF_AFDATA_LOCK_ASSERT(ifp);
  847 
  848         llflags = 0;
  849         if (flags & ND6_CREATE)
  850             llflags |= LLE_CREATE;
  851         if (flags & ND6_EXCLUSIVE)
  852             llflags |= LLE_EXCLUSIVE;   
  853         
  854         ln = lla_lookup(LLTABLE6(ifp), llflags, (struct sockaddr *)&sin6);
  855         if ((ln != NULL) && (llflags & LLE_CREATE))
  856                 ln->ln_state = ND6_LLINFO_NOSTATE;
  857         
  858         return (ln);
  859 }
  860 
  861 /*
  862  * Test whether a given IPv6 address is a neighbor or not, ignoring
  863  * the actual neighbor cache.  The neighbor cache is ignored in order
  864  * to not reenter the routing code from within itself.
  865  */
  866 static int
  867 nd6_is_new_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp)
  868 {
  869         struct nd_prefix *pr;
  870         struct ifaddr *dstaddr;
  871 
  872         /*
  873          * A link-local address is always a neighbor.
  874          * XXX: a link does not necessarily specify a single interface.
  875          */
  876         if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr)) {
  877                 struct sockaddr_in6 sin6_copy;
  878                 u_int32_t zone;
  879 
  880                 /*
  881                  * We need sin6_copy since sa6_recoverscope() may modify the
  882                  * content (XXX).
  883                  */
  884                 sin6_copy = *addr;
  885                 if (sa6_recoverscope(&sin6_copy))
  886                         return (0); /* XXX: should be impossible */
  887                 if (in6_setscope(&sin6_copy.sin6_addr, ifp, &zone))
  888                         return (0);
  889                 if (sin6_copy.sin6_scope_id == zone)
  890                         return (1);
  891                 else
  892                         return (0);
  893         }
  894 
  895         /*
  896          * If the address matches one of our addresses,
  897          * it should be a neighbor.
  898          * If the address matches one of our on-link prefixes, it should be a
  899          * neighbor.
  900          */
  901         LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
  902                 if (pr->ndpr_ifp != ifp)
  903                         continue;
  904 
  905                 if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) {
  906                         struct rtentry *rt;
  907 
  908                         /* Always use the default FIB here. */
  909                         rt = in6_rtalloc1((struct sockaddr *)&pr->ndpr_prefix,
  910                             0, 0, RT_DEFAULT_FIB);
  911                         if (rt == NULL)
  912                                 continue;
  913                         /*
  914                          * This is the case where multiple interfaces
  915                          * have the same prefix, but only one is installed 
  916                          * into the routing table and that prefix entry
  917                          * is not the one being examined here. In the case
  918                          * where RADIX_MPATH is enabled, multiple route
  919                          * entries (of the same rt_key value) will be 
  920                          * installed because the interface addresses all
  921                          * differ.
  922                          */
  923                         if (!IN6_ARE_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
  924                                &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr)) {
  925                                 RTFREE_LOCKED(rt);
  926                                 continue;
  927                         }
  928                         RTFREE_LOCKED(rt);
  929                 }
  930 
  931                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
  932                     &addr->sin6_addr, &pr->ndpr_mask))
  933                         return (1);
  934         }
  935 
  936         /*
  937          * If the address is assigned on the node of the other side of
  938          * a p2p interface, the address should be a neighbor.
  939          */
  940         dstaddr = ifa_ifwithdstaddr((struct sockaddr *)addr);
  941         if (dstaddr != NULL) {
  942                 if (dstaddr->ifa_ifp == ifp) {
  943                         ifa_free(dstaddr);
  944                         return (1);
  945                 }
  946                 ifa_free(dstaddr);
  947         }
  948 
  949         /*
  950          * If the default router list is empty, all addresses are regarded
  951          * as on-link, and thus, as a neighbor.
  952          */
  953         if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV &&
  954             TAILQ_EMPTY(&V_nd_defrouter) &&
  955             V_nd6_defifindex == ifp->if_index) {
  956                 return (1);
  957         }
  958 
  959         return (0);
  960 }
  961 
  962 
  963 /*
  964  * Detect if a given IPv6 address identifies a neighbor on a given link.
  965  * XXX: should take care of the destination of a p2p link?
  966  */
  967 int
  968 nd6_is_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp)
  969 {
  970         struct llentry *lle;
  971         int rc = 0;
  972 
  973         IF_AFDATA_UNLOCK_ASSERT(ifp);
  974         if (nd6_is_new_addr_neighbor(addr, ifp))
  975                 return (1);
  976 
  977         /*
  978          * Even if the address matches none of our addresses, it might be
  979          * in the neighbor cache.
  980          */
  981         IF_AFDATA_LOCK(ifp);
  982         if ((lle = nd6_lookup(&addr->sin6_addr, 0, ifp)) != NULL) {
  983                 LLE_RUNLOCK(lle);
  984                 rc = 1;
  985         }
  986         IF_AFDATA_UNLOCK(ifp);
  987         return (rc);
  988 }
  989 
  990 /*
  991  * Free an nd6 llinfo entry.
  992  * Since the function would cause significant changes in the kernel, DO NOT
  993  * make it global, unless you have a strong reason for the change, and are sure
  994  * that the change is safe.
  995  */
  996 static struct llentry *
  997 nd6_free(struct llentry *ln, int gc)
  998 {
  999         struct llentry *next;
 1000         struct nd_defrouter *dr;
 1001         struct ifnet *ifp;
 1002 
 1003         LLE_WLOCK_ASSERT(ln);
 1004 
 1005         /*
 1006          * we used to have pfctlinput(PRC_HOSTDEAD) here.
 1007          * even though it is not harmful, it was not really necessary.
 1008          */
 1009 
 1010         /* cancel timer */
 1011         nd6_llinfo_settimer_locked(ln, -1);
 1012 
 1013         ifp = ln->lle_tbl->llt_ifp;
 1014 
 1015         if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
 1016                 dr = defrouter_lookup(&L3_ADDR_SIN6(ln)->sin6_addr, ifp);
 1017 
 1018                 if (dr != NULL && dr->expire &&
 1019                     ln->ln_state == ND6_LLINFO_STALE && gc) {
 1020                         /*
 1021                          * If the reason for the deletion is just garbage
 1022                          * collection, and the neighbor is an active default
 1023                          * router, do not delete it.  Instead, reset the GC
 1024                          * timer using the router's lifetime.
 1025                          * Simply deleting the entry would affect default
 1026                          * router selection, which is not necessarily a good
 1027                          * thing, especially when we're using router preference
 1028                          * values.
 1029                          * XXX: the check for ln_state would be redundant,
 1030                          *      but we intentionally keep it just in case.
 1031                          */
 1032                         if (dr->expire > time_second)
 1033                                 nd6_llinfo_settimer_locked(ln,
 1034                                     (dr->expire - time_second) * hz);
 1035                         else
 1036                                 nd6_llinfo_settimer_locked(ln,
 1037                                     (long)V_nd6_gctimer * hz);
 1038 
 1039                         next = LIST_NEXT(ln, lle_next);
 1040                         LLE_REMREF(ln);
 1041                         LLE_WUNLOCK(ln);
 1042                         return (next);
 1043                 }
 1044 
 1045                 if (dr) {
 1046                         /*
 1047                          * Unreachablity of a router might affect the default
 1048                          * router selection and on-link detection of advertised
 1049                          * prefixes.
 1050                          */
 1051 
 1052                         /*
 1053                          * Temporarily fake the state to choose a new default
 1054                          * router and to perform on-link determination of
 1055                          * prefixes correctly.
 1056                          * Below the state will be set correctly,
 1057                          * or the entry itself will be deleted.
 1058                          */
 1059                         ln->ln_state = ND6_LLINFO_INCOMPLETE;
 1060                 }
 1061 
 1062                 if (ln->ln_router || dr) {
 1063 
 1064                         /*
 1065                          * We need to unlock to avoid a LOR with rt6_flush() with the
 1066                          * rnh and for the calls to pfxlist_onlink_check() and
 1067                          * defrouter_select() in the block further down for calls
 1068                          * into nd6_lookup().  We still hold a ref.
 1069                          */
 1070                         LLE_WUNLOCK(ln);
 1071 
 1072                         /*
 1073                          * rt6_flush must be called whether or not the neighbor
 1074                          * is in the Default Router List.
 1075                          * See a corresponding comment in nd6_na_input().
 1076                          */
 1077                         rt6_flush(&L3_ADDR_SIN6(ln)->sin6_addr, ifp);
 1078                 }
 1079 
 1080                 if (dr) {
 1081                         /*
 1082                          * Since defrouter_select() does not affect the
 1083                          * on-link determination and MIP6 needs the check
 1084                          * before the default router selection, we perform
 1085                          * the check now.
 1086                          */
 1087                         pfxlist_onlink_check();
 1088 
 1089                         /*
 1090                          * Refresh default router list.
 1091                          */
 1092                         defrouter_select();
 1093                 }
 1094 
 1095                 if (ln->ln_router || dr)
 1096                         LLE_WLOCK(ln);
 1097         }
 1098 
 1099         /*
 1100          * Before deleting the entry, remember the next entry as the
 1101          * return value.  We need this because pfxlist_onlink_check() above
 1102          * might have freed other entries (particularly the old next entry) as
 1103          * a side effect (XXX).
 1104          */
 1105         next = LIST_NEXT(ln, lle_next);
 1106 
 1107         /*
 1108          * Save to unlock. We still hold an extra reference and will not
 1109          * free(9) in llentry_free() if someone else holds one as well.
 1110          */
 1111         LLE_WUNLOCK(ln);
 1112         IF_AFDATA_LOCK(ifp);
 1113         LLE_WLOCK(ln);
 1114         LLE_REMREF(ln);
 1115         llentry_free(ln);
 1116         IF_AFDATA_UNLOCK(ifp);
 1117 
 1118         return (next);
 1119 }
 1120 
 1121 /*
 1122  * Upper-layer reachability hint for Neighbor Unreachability Detection.
 1123  *
 1124  * XXX cost-effective methods?
 1125  */
 1126 void
 1127 nd6_nud_hint(struct rtentry *rt, struct in6_addr *dst6, int force)
 1128 {
 1129         struct llentry *ln;
 1130         struct ifnet *ifp;
 1131 
 1132         if ((dst6 == NULL) || (rt == NULL))
 1133                 return;
 1134 
 1135         ifp = rt->rt_ifp;
 1136         IF_AFDATA_LOCK(ifp);
 1137         ln = nd6_lookup(dst6, ND6_EXCLUSIVE, NULL);
 1138         IF_AFDATA_UNLOCK(ifp);
 1139         if (ln == NULL)
 1140                 return;
 1141 
 1142         if (ln->ln_state < ND6_LLINFO_REACHABLE)
 1143                 goto done;
 1144 
 1145         /*
 1146          * if we get upper-layer reachability confirmation many times,
 1147          * it is possible we have false information.
 1148          */
 1149         if (!force) {
 1150                 ln->ln_byhint++;
 1151                 if (ln->ln_byhint > V_nd6_maxnudhint) {
 1152                         goto done;
 1153                 }
 1154         }
 1155 
 1156         ln->ln_state = ND6_LLINFO_REACHABLE;
 1157         if (!ND6_LLINFO_PERMANENT(ln)) {
 1158                 nd6_llinfo_settimer_locked(ln,
 1159                     (long)ND_IFINFO(rt->rt_ifp)->reachable * hz);
 1160         }
 1161 done:
 1162         LLE_WUNLOCK(ln);
 1163 }
 1164 
 1165 
 1166 /*
 1167  * Rejuvenate this function for routing operations related
 1168  * processing.
 1169  */
 1170 void
 1171 nd6_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info)
 1172 {
 1173         struct sockaddr_in6 *gateway;
 1174         struct nd_defrouter *dr;
 1175         struct ifnet *ifp;
 1176 
 1177         RT_LOCK_ASSERT(rt);
 1178         gateway = (struct sockaddr_in6 *)rt->rt_gateway;
 1179         ifp = rt->rt_ifp;
 1180 
 1181         switch (req) {
 1182         case RTM_ADD:
 1183                 break;
 1184 
 1185         case RTM_DELETE:
 1186                 if (!ifp)
 1187                         return;
 1188                 /*
 1189                  * Only indirect routes are interesting.
 1190                  */
 1191                 if ((rt->rt_flags & RTF_GATEWAY) == 0)
 1192                         return;
 1193                 /*
 1194                  * check for default route
 1195                  */
 1196                 if (IN6_ARE_ADDR_EQUAL(&in6addr_any, 
 1197                                        &SIN6(rt_key(rt))->sin6_addr)) {
 1198 
 1199                         dr = defrouter_lookup(&gateway->sin6_addr, ifp);
 1200                         if (dr != NULL)
 1201                                 dr->installed = 0;
 1202                 }
 1203                 break;
 1204         }
 1205 }
 1206 
 1207 
 1208 int
 1209 nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp)
 1210 {
 1211         struct in6_drlist *drl = (struct in6_drlist *)data;
 1212         struct in6_oprlist *oprl = (struct in6_oprlist *)data;
 1213         struct in6_ndireq *ndi = (struct in6_ndireq *)data;
 1214         struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data;
 1215         struct in6_ndifreq *ndif = (struct in6_ndifreq *)data;
 1216         struct nd_defrouter *dr;
 1217         struct nd_prefix *pr;
 1218         int i = 0, error = 0;
 1219         int s;
 1220 
 1221         switch (cmd) {
 1222         case SIOCGDRLST_IN6:
 1223                 /*
 1224                  * obsolete API, use sysctl under net.inet6.icmp6
 1225                  */
 1226                 bzero(drl, sizeof(*drl));
 1227                 s = splnet();
 1228                 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
 1229                         if (i >= DRLSTSIZ)
 1230                                 break;
 1231                         drl->defrouter[i].rtaddr = dr->rtaddr;
 1232                         in6_clearscope(&drl->defrouter[i].rtaddr);
 1233 
 1234                         drl->defrouter[i].flags = dr->flags;
 1235                         drl->defrouter[i].rtlifetime = dr->rtlifetime;
 1236                         drl->defrouter[i].expire = dr->expire;
 1237                         drl->defrouter[i].if_index = dr->ifp->if_index;
 1238                         i++;
 1239                 }
 1240                 splx(s);
 1241                 break;
 1242         case SIOCGPRLST_IN6:
 1243                 /*
 1244                  * obsolete API, use sysctl under net.inet6.icmp6
 1245                  *
 1246                  * XXX the structure in6_prlist was changed in backward-
 1247                  * incompatible manner.  in6_oprlist is used for SIOCGPRLST_IN6,
 1248                  * in6_prlist is used for nd6_sysctl() - fill_prlist().
 1249                  */
 1250                 /*
 1251                  * XXX meaning of fields, especialy "raflags", is very
 1252                  * differnet between RA prefix list and RR/static prefix list.
 1253                  * how about separating ioctls into two?
 1254                  */
 1255                 bzero(oprl, sizeof(*oprl));
 1256                 s = splnet();
 1257                 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
 1258                         struct nd_pfxrouter *pfr;
 1259                         int j;
 1260 
 1261                         if (i >= PRLSTSIZ)
 1262                                 break;
 1263                         oprl->prefix[i].prefix = pr->ndpr_prefix.sin6_addr;
 1264                         oprl->prefix[i].raflags = pr->ndpr_raf;
 1265                         oprl->prefix[i].prefixlen = pr->ndpr_plen;
 1266                         oprl->prefix[i].vltime = pr->ndpr_vltime;
 1267                         oprl->prefix[i].pltime = pr->ndpr_pltime;
 1268                         oprl->prefix[i].if_index = pr->ndpr_ifp->if_index;
 1269                         if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME)
 1270                                 oprl->prefix[i].expire = 0;
 1271                         else {
 1272                                 time_t maxexpire;
 1273 
 1274                                 /* XXX: we assume time_t is signed. */
 1275                                 maxexpire = (-1) &
 1276                                     ~((time_t)1 <<
 1277                                     ((sizeof(maxexpire) * 8) - 1));
 1278                                 if (pr->ndpr_vltime <
 1279                                     maxexpire - pr->ndpr_lastupdate) {
 1280                                         oprl->prefix[i].expire =
 1281                                             pr->ndpr_lastupdate +
 1282                                             pr->ndpr_vltime;
 1283                                 } else
 1284                                         oprl->prefix[i].expire = maxexpire;
 1285                         }
 1286 
 1287                         j = 0;
 1288                         LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) {
 1289                                 if (j < DRLSTSIZ) {
 1290 #define RTRADDR oprl->prefix[i].advrtr[j]
 1291                                         RTRADDR = pfr->router->rtaddr;
 1292                                         in6_clearscope(&RTRADDR);
 1293 #undef RTRADDR
 1294                                 }
 1295                                 j++;
 1296                         }
 1297                         oprl->prefix[i].advrtrs = j;
 1298                         oprl->prefix[i].origin = PR_ORIG_RA;
 1299 
 1300                         i++;
 1301                 }
 1302                 splx(s);
 1303 
 1304                 break;
 1305         case OSIOCGIFINFO_IN6:
 1306 #define ND      ndi->ndi
 1307                 /* XXX: old ndp(8) assumes a positive value for linkmtu. */
 1308                 bzero(&ND, sizeof(ND));
 1309                 ND.linkmtu = IN6_LINKMTU(ifp);
 1310                 ND.maxmtu = ND_IFINFO(ifp)->maxmtu;
 1311                 ND.basereachable = ND_IFINFO(ifp)->basereachable;
 1312                 ND.reachable = ND_IFINFO(ifp)->reachable;
 1313                 ND.retrans = ND_IFINFO(ifp)->retrans;
 1314                 ND.flags = ND_IFINFO(ifp)->flags;
 1315                 ND.recalctm = ND_IFINFO(ifp)->recalctm;
 1316                 ND.chlim = ND_IFINFO(ifp)->chlim;
 1317                 break;
 1318         case SIOCGIFINFO_IN6:
 1319                 ND = *ND_IFINFO(ifp);
 1320                 break;
 1321         case SIOCSIFINFO_IN6:
 1322                 /*
 1323                  * used to change host variables from userland.
 1324                  * intented for a use on router to reflect RA configurations.
 1325                  */
 1326                 /* 0 means 'unspecified' */
 1327                 if (ND.linkmtu != 0) {
 1328                         if (ND.linkmtu < IPV6_MMTU ||
 1329                             ND.linkmtu > IN6_LINKMTU(ifp)) {
 1330                                 error = EINVAL;
 1331                                 break;
 1332                         }
 1333                         ND_IFINFO(ifp)->linkmtu = ND.linkmtu;
 1334                 }
 1335 
 1336                 if (ND.basereachable != 0) {
 1337                         int obasereachable = ND_IFINFO(ifp)->basereachable;
 1338 
 1339                         ND_IFINFO(ifp)->basereachable = ND.basereachable;
 1340                         if (ND.basereachable != obasereachable)
 1341                                 ND_IFINFO(ifp)->reachable =
 1342                                     ND_COMPUTE_RTIME(ND.basereachable);
 1343                 }
 1344                 if (ND.retrans != 0)
 1345                         ND_IFINFO(ifp)->retrans = ND.retrans;
 1346                 if (ND.chlim != 0)
 1347                         ND_IFINFO(ifp)->chlim = ND.chlim;
 1348                 /* FALLTHROUGH */
 1349         case SIOCSIFINFO_FLAGS:
 1350         {
 1351                 struct ifaddr *ifa;
 1352                 struct in6_ifaddr *ia;
 1353 
 1354                 /*
 1355                  * Try to clear ifdisabled flag when enabling
 1356                  * accept_rtadv or auto_linklocal.
 1357                  */
 1358                 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
 1359                     !(ND.flags & ND6_IFF_IFDISABLED) &&
 1360                     (ND.flags & (ND6_IFF_ACCEPT_RTADV |
 1361                     ND6_IFF_AUTO_LINKLOCAL)))
 1362                         ND.flags &= ~ND6_IFF_IFDISABLED;
 1363 
 1364                 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
 1365                     !(ND.flags & ND6_IFF_IFDISABLED)) {
 1366                         /* ifdisabled 1->0 transision */
 1367 
 1368                         /*
 1369                          * If the interface is marked as ND6_IFF_IFDISABLED and
 1370                          * has an link-local address with IN6_IFF_DUPLICATED,
 1371                          * do not clear ND6_IFF_IFDISABLED.
 1372                          * See RFC 4862, Section 5.4.5.
 1373                          */
 1374                         int duplicated_linklocal = 0;
 1375 
 1376                         IF_ADDR_RLOCK(ifp);
 1377                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1378                                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1379                                         continue;
 1380                                 ia = (struct in6_ifaddr *)ifa;
 1381                                 if ((ia->ia6_flags & IN6_IFF_DUPLICATED) &&
 1382                                     IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia))) {
 1383                                         duplicated_linklocal = 1;
 1384                                         break;
 1385                                 }
 1386                         }
 1387                         IF_ADDR_RUNLOCK(ifp);
 1388 
 1389                         if (duplicated_linklocal) {
 1390                                 ND.flags |= ND6_IFF_IFDISABLED;
 1391                                 log(LOG_ERR, "Cannot enable an interface"
 1392                                     " with a link-local address marked"
 1393                                     " duplicate.\n");
 1394                         } else {
 1395                                 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IFDISABLED;
 1396                                 if (ifp->if_flags & IFF_UP)
 1397                                         in6_if_up(ifp);
 1398                         }
 1399                 } else if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
 1400                             (ND.flags & ND6_IFF_IFDISABLED)) {
 1401                         /* ifdisabled 0->1 transision */
 1402                         /* Mark all IPv6 address as tentative. */
 1403 
 1404                         ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
 1405                         IF_ADDR_RLOCK(ifp);
 1406                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1407                                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1408                                         continue;
 1409                                 ia = (struct in6_ifaddr *)ifa;
 1410                                 ia->ia6_flags |= IN6_IFF_TENTATIVE;
 1411                         }
 1412                         IF_ADDR_RUNLOCK(ifp);
 1413                 }
 1414 
 1415                 if (ND.flags & ND6_IFF_AUTO_LINKLOCAL) {
 1416                         if (!(ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL)) {
 1417                                 /* auto_linklocal 0->1 transision */
 1418 
 1419                                 /* If no link-local address on ifp, configure */
 1420                                 ND_IFINFO(ifp)->flags |= ND6_IFF_AUTO_LINKLOCAL;
 1421                                 in6_ifattach(ifp, NULL);
 1422                         } else if (!(ND.flags & ND6_IFF_IFDISABLED) &&
 1423                             ifp->if_flags & IFF_UP) {
 1424                                 /*
 1425                                  * When the IF already has
 1426                                  * ND6_IFF_AUTO_LINKLOCAL, no link-local
 1427                                  * address is assigned, and IFF_UP, try to
 1428                                  * assign one.
 1429                                  */
 1430                                 int haslinklocal = 0;
 1431                         
 1432                                 IF_ADDR_RLOCK(ifp);
 1433                                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1434                                         if (ifa->ifa_addr->sa_family != AF_INET6)
 1435                                                 continue;
 1436                                         ia = (struct in6_ifaddr *)ifa;
 1437                                         if (IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia))) {
 1438                                                 haslinklocal = 1;
 1439                                                 break;
 1440                                         }
 1441                                 }
 1442                                 IF_ADDR_RUNLOCK(ifp);
 1443                                 if (!haslinklocal)
 1444                                         in6_ifattach(ifp, NULL);
 1445                         }
 1446                 }
 1447         }
 1448                 ND_IFINFO(ifp)->flags = ND.flags;
 1449                 break;
 1450 #undef ND
 1451         case SIOCSNDFLUSH_IN6:  /* XXX: the ioctl name is confusing... */
 1452                 /* sync kernel routing table with the default router list */
 1453                 defrouter_reset();
 1454                 defrouter_select();
 1455                 break;
 1456         case SIOCSPFXFLUSH_IN6:
 1457         {
 1458                 /* flush all the prefix advertised by routers */
 1459                 struct nd_prefix *pr, *next;
 1460 
 1461                 s = splnet();
 1462                 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, next) {
 1463                         struct in6_ifaddr *ia, *ia_next;
 1464 
 1465                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1466                                 continue; /* XXX */
 1467 
 1468                         /* do we really have to remove addresses as well? */
 1469                         /* XXXRW: in6_ifaddrhead locking. */
 1470                         TAILQ_FOREACH_SAFE(ia, &V_in6_ifaddrhead, ia_link,
 1471                             ia_next) {
 1472                                 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1473                                         continue;
 1474 
 1475                                 if (ia->ia6_ndpr == pr)
 1476                                         in6_purgeaddr(&ia->ia_ifa);
 1477                         }
 1478                         prelist_remove(pr);
 1479                 }
 1480                 splx(s);
 1481                 break;
 1482         }
 1483         case SIOCSRTRFLUSH_IN6:
 1484         {
 1485                 /* flush all the default routers */
 1486                 struct nd_defrouter *dr, *next;
 1487 
 1488                 s = splnet();
 1489                 defrouter_reset();
 1490                 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, next) {
 1491                         defrtrlist_del(dr);
 1492                 }
 1493                 defrouter_select();
 1494                 splx(s);
 1495                 break;
 1496         }
 1497         case SIOCGNBRINFO_IN6:
 1498         {
 1499                 struct llentry *ln;
 1500                 struct in6_addr nb_addr = nbi->addr; /* make local for safety */
 1501 
 1502                 if ((error = in6_setscope(&nb_addr, ifp, NULL)) != 0)
 1503                         return (error);
 1504 
 1505                 IF_AFDATA_LOCK(ifp);
 1506                 ln = nd6_lookup(&nb_addr, 0, ifp);
 1507                 IF_AFDATA_UNLOCK(ifp);
 1508 
 1509                 if (ln == NULL) {
 1510                         error = EINVAL;
 1511                         break;
 1512                 }
 1513                 nbi->state = ln->ln_state;
 1514                 nbi->asked = ln->la_asked;
 1515                 nbi->isrouter = ln->ln_router;
 1516                 nbi->expire = ln->la_expire;
 1517                 LLE_RUNLOCK(ln);
 1518                 break;
 1519         }
 1520         case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
 1521                 ndif->ifindex = V_nd6_defifindex;
 1522                 break;
 1523         case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
 1524                 return (nd6_setdefaultiface(ndif->ifindex));
 1525         }
 1526         return (error);
 1527 }
 1528 
 1529 /*
 1530  * Create neighbor cache entry and cache link-layer address,
 1531  * on reception of inbound ND6 packets.  (RS/RA/NS/redirect)
 1532  *
 1533  * type - ICMP6 type
 1534  * code - type dependent information
 1535  *
 1536  * XXXXX
 1537  *  The caller of this function already acquired the ndp 
 1538  *  cache table lock because the cache entry is returned.
 1539  */
 1540 struct llentry *
 1541 nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr,
 1542     int lladdrlen, int type, int code)
 1543 {
 1544         struct llentry *ln = NULL;
 1545         int is_newentry;
 1546         int do_update;
 1547         int olladdr;
 1548         int llchange;
 1549         int flags;
 1550         int newstate = 0;
 1551         uint16_t router = 0;
 1552         struct sockaddr_in6 sin6;
 1553         struct mbuf *chain = NULL;
 1554         int static_route = 0;
 1555 
 1556         IF_AFDATA_UNLOCK_ASSERT(ifp);
 1557 
 1558         KASSERT(ifp != NULL, ("%s: ifp == NULL", __func__));
 1559         KASSERT(from != NULL, ("%s: from == NULL", __func__));
 1560 
 1561         /* nothing must be updated for unspecified address */
 1562         if (IN6_IS_ADDR_UNSPECIFIED(from))
 1563                 return NULL;
 1564 
 1565         /*
 1566          * Validation about ifp->if_addrlen and lladdrlen must be done in
 1567          * the caller.
 1568          *
 1569          * XXX If the link does not have link-layer adderss, what should
 1570          * we do? (ifp->if_addrlen == 0)
 1571          * Spec says nothing in sections for RA, RS and NA.  There's small
 1572          * description on it in NS section (RFC 2461 7.2.3).
 1573          */
 1574         flags = lladdr ? ND6_EXCLUSIVE : 0;
 1575         IF_AFDATA_LOCK(ifp);
 1576         ln = nd6_lookup(from, flags, ifp);
 1577 
 1578         if (ln == NULL) {
 1579                 flags |= ND6_EXCLUSIVE;
 1580                 ln = nd6_lookup(from, flags | ND6_CREATE, ifp);
 1581                 IF_AFDATA_UNLOCK(ifp);
 1582                 is_newentry = 1;
 1583         } else {
 1584                 IF_AFDATA_UNLOCK(ifp);          
 1585                 /* do nothing if static ndp is set */
 1586                 if (ln->la_flags & LLE_STATIC) {
 1587                         static_route = 1;
 1588                         goto done;
 1589                 }
 1590                 is_newentry = 0;
 1591         }
 1592         if (ln == NULL)
 1593                 return (NULL);
 1594 
 1595         olladdr = (ln->la_flags & LLE_VALID) ? 1 : 0;
 1596         if (olladdr && lladdr) {
 1597                 llchange = bcmp(lladdr, &ln->ll_addr,
 1598                     ifp->if_addrlen);
 1599         } else
 1600                 llchange = 0;
 1601 
 1602         /*
 1603          * newentry olladdr  lladdr  llchange   (*=record)
 1604          *      0       n       n       --      (1)
 1605          *      0       y       n       --      (2)
 1606          *      0       n       y       --      (3) * STALE
 1607          *      0       y       y       n       (4) *
 1608          *      0       y       y       y       (5) * STALE
 1609          *      1       --      n       --      (6)   NOSTATE(= PASSIVE)
 1610          *      1       --      y       --      (7) * STALE
 1611          */
 1612 
 1613         if (lladdr) {           /* (3-5) and (7) */
 1614                 /*
 1615                  * Record source link-layer address
 1616                  * XXX is it dependent to ifp->if_type?
 1617                  */
 1618                 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
 1619                 ln->la_flags |= LLE_VALID;
 1620         }
 1621 
 1622         if (!is_newentry) {
 1623                 if ((!olladdr && lladdr != NULL) ||     /* (3) */
 1624                     (olladdr && lladdr != NULL && llchange)) {  /* (5) */
 1625                         do_update = 1;
 1626                         newstate = ND6_LLINFO_STALE;
 1627                 } else                                  /* (1-2,4) */
 1628                         do_update = 0;
 1629         } else {
 1630                 do_update = 1;
 1631                 if (lladdr == NULL)                     /* (6) */
 1632                         newstate = ND6_LLINFO_NOSTATE;
 1633                 else                                    /* (7) */
 1634                         newstate = ND6_LLINFO_STALE;
 1635         }
 1636 
 1637         if (do_update) {
 1638                 /*
 1639                  * Update the state of the neighbor cache.
 1640                  */
 1641                 ln->ln_state = newstate;
 1642 
 1643                 if (ln->ln_state == ND6_LLINFO_STALE) {
 1644                         /*
 1645                          * XXX: since nd6_output() below will cause
 1646                          * state tansition to DELAY and reset the timer,
 1647                          * we must set the timer now, although it is actually
 1648                          * meaningless.
 1649                          */
 1650                         nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
 1651 
 1652                         if (ln->la_hold) {
 1653                                 struct mbuf *m_hold, *m_hold_next;
 1654 
 1655                                 /*
 1656                                  * reset the la_hold in advance, to explicitly
 1657                                  * prevent a la_hold lookup in nd6_output()
 1658                                  * (wouldn't happen, though...)
 1659                                  */
 1660                                 for (m_hold = ln->la_hold, ln->la_hold = NULL;
 1661                                     m_hold; m_hold = m_hold_next) {
 1662                                         m_hold_next = m_hold->m_nextpkt;
 1663                                         m_hold->m_nextpkt = NULL;
 1664 
 1665                                         /*
 1666                                          * we assume ifp is not a p2p here, so
 1667                                          * just set the 2nd argument as the
 1668                                          * 1st one.
 1669                                          */
 1670                                         nd6_output_lle(ifp, ifp, m_hold, L3_ADDR_SIN6(ln), NULL, ln, &chain);
 1671                                 }
 1672                                 /*
 1673                                  * If we have mbufs in the chain we need to do
 1674                                  * deferred transmit. Copy the address from the
 1675                                  * llentry before dropping the lock down below.
 1676                                  */
 1677                                 if (chain != NULL)
 1678                                         memcpy(&sin6, L3_ADDR_SIN6(ln), sizeof(sin6));
 1679                         }
 1680                 } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
 1681                         /* probe right away */
 1682                         nd6_llinfo_settimer_locked((void *)ln, 0);
 1683                 }
 1684         }
 1685 
 1686         /*
 1687          * ICMP6 type dependent behavior.
 1688          *
 1689          * NS: clear IsRouter if new entry
 1690          * RS: clear IsRouter
 1691          * RA: set IsRouter if there's lladdr
 1692          * redir: clear IsRouter if new entry
 1693          *
 1694          * RA case, (1):
 1695          * The spec says that we must set IsRouter in the following cases:
 1696          * - If lladdr exist, set IsRouter.  This means (1-5).
 1697          * - If it is old entry (!newentry), set IsRouter.  This means (7).
 1698          * So, based on the spec, in (1-5) and (7) cases we must set IsRouter.
 1699          * A quetion arises for (1) case.  (1) case has no lladdr in the
 1700          * neighbor cache, this is similar to (6).
 1701          * This case is rare but we figured that we MUST NOT set IsRouter.
 1702          *
 1703          * newentry olladdr  lladdr  llchange       NS  RS  RA  redir
 1704          *                                                      D R
 1705          *      0       n       n       --      (1)     c   ?     s
 1706          *      0       y       n       --      (2)     c   s     s
 1707          *      0       n       y       --      (3)     c   s     s
 1708          *      0       y       y       n       (4)     c   s     s
 1709          *      0       y       y       y       (5)     c   s     s
 1710          *      1       --      n       --      (6) c   c       c s
 1711          *      1       --      y       --      (7) c   c   s   c s
 1712          *
 1713          *                                      (c=clear s=set)
 1714          */
 1715         switch (type & 0xff) {
 1716         case ND_NEIGHBOR_SOLICIT:
 1717                 /*
 1718                  * New entry must have is_router flag cleared.
 1719                  */
 1720                 if (is_newentry)        /* (6-7) */
 1721                         ln->ln_router = 0;
 1722                 break;
 1723         case ND_REDIRECT:
 1724                 /*
 1725                  * If the icmp is a redirect to a better router, always set the
 1726                  * is_router flag.  Otherwise, if the entry is newly created,
 1727                  * clear the flag.  [RFC 2461, sec 8.3]
 1728                  */
 1729                 if (code == ND_REDIRECT_ROUTER)
 1730                         ln->ln_router = 1;
 1731                 else if (is_newentry) /* (6-7) */
 1732                         ln->ln_router = 0;
 1733                 break;
 1734         case ND_ROUTER_SOLICIT:
 1735                 /*
 1736                  * is_router flag must always be cleared.
 1737                  */
 1738                 ln->ln_router = 0;
 1739                 break;
 1740         case ND_ROUTER_ADVERT:
 1741                 /*
 1742                  * Mark an entry with lladdr as a router.
 1743                  */
 1744                 if ((!is_newentry && (olladdr || lladdr)) ||    /* (2-5) */
 1745                     (is_newentry && lladdr)) {                  /* (7) */
 1746                         ln->ln_router = 1;
 1747                 }
 1748                 break;
 1749         }
 1750 
 1751         if (ln != NULL) {
 1752                 static_route = (ln->la_flags & LLE_STATIC);
 1753                 router = ln->ln_router;
 1754 
 1755                 if (flags & ND6_EXCLUSIVE)
 1756                         LLE_WUNLOCK(ln);
 1757                 else
 1758                         LLE_RUNLOCK(ln);
 1759                 if (static_route)
 1760                         ln = NULL;
 1761         }
 1762         if (chain)
 1763                 nd6_output_flush(ifp, ifp, chain, &sin6, NULL);
 1764         
 1765         /*
 1766          * When the link-layer address of a router changes, select the
 1767          * best router again.  In particular, when the neighbor entry is newly
 1768          * created, it might affect the selection policy.
 1769          * Question: can we restrict the first condition to the "is_newentry"
 1770          * case?
 1771          * XXX: when we hear an RA from a new router with the link-layer
 1772          * address option, defrouter_select() is called twice, since
 1773          * defrtrlist_update called the function as well.  However, I believe
 1774          * we can compromise the overhead, since it only happens the first
 1775          * time.
 1776          * XXX: although defrouter_select() should not have a bad effect
 1777          * for those are not autoconfigured hosts, we explicitly avoid such
 1778          * cases for safety.
 1779          */
 1780         if (do_update && router &&
 1781             ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
 1782                 /*
 1783                  * guaranteed recursion
 1784                  */
 1785                 defrouter_select();
 1786         }
 1787         
 1788         return (ln);
 1789 done:   
 1790         if (ln != NULL) {
 1791                 if (flags & ND6_EXCLUSIVE)
 1792                         LLE_WUNLOCK(ln);
 1793                 else
 1794                         LLE_RUNLOCK(ln);
 1795                 if (static_route)
 1796                         ln = NULL;
 1797         }
 1798         return (ln);
 1799 }
 1800 
 1801 static void
 1802 nd6_slowtimo(void *arg)
 1803 {
 1804         CURVNET_SET((struct vnet *) arg);
 1805         struct nd_ifinfo *nd6if;
 1806         struct ifnet *ifp;
 1807 
 1808         callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
 1809             nd6_slowtimo, curvnet);
 1810         IFNET_RLOCK_NOSLEEP();
 1811         TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
 1812                 nd6if = ND_IFINFO(ifp);
 1813                 if (nd6if->basereachable && /* already initialized */
 1814                     (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) {
 1815                         /*
 1816                          * Since reachable time rarely changes by router
 1817                          * advertisements, we SHOULD insure that a new random
 1818                          * value gets recomputed at least once every few hours.
 1819                          * (RFC 2461, 6.3.4)
 1820                          */
 1821                         nd6if->recalctm = V_nd6_recalc_reachtm_interval;
 1822                         nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable);
 1823                 }
 1824         }
 1825         IFNET_RUNLOCK_NOSLEEP();
 1826         CURVNET_RESTORE();
 1827 }
 1828 
 1829 int
 1830 nd6_output(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m0,
 1831     struct sockaddr_in6 *dst, struct rtentry *rt0)
 1832 {
 1833 
 1834         return (nd6_output_lle(ifp, origifp, m0, dst, rt0, NULL, NULL));
 1835 }
 1836 
 1837 
 1838 /*
 1839  * Note that I'm not enforcing any global serialization
 1840  * lle state or asked changes here as the logic is too
 1841  * complicated to avoid having to always acquire an exclusive
 1842  * lock
 1843  * KMM
 1844  *
 1845  */
 1846 #define senderr(e) { error = (e); goto bad;}
 1847 
 1848 int
 1849 nd6_output_lle(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m0,
 1850     struct sockaddr_in6 *dst, struct rtentry *rt0, struct llentry *lle,
 1851         struct mbuf **chain)
 1852 {
 1853         struct mbuf *m = m0;
 1854         struct m_tag *mtag;
 1855         struct llentry *ln = lle;
 1856         struct ip6_hdr *ip6;
 1857         int error = 0;
 1858         int flags = 0;
 1859         int ip6len;
 1860 
 1861 #ifdef INVARIANTS
 1862         if (lle != NULL) {
 1863                 
 1864                 LLE_WLOCK_ASSERT(lle);
 1865 
 1866                 KASSERT(chain != NULL, (" lle locked but no mbuf chain pointer passed"));
 1867         }
 1868 #endif
 1869         if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr))
 1870                 goto sendpkt;
 1871 
 1872         if (nd6_need_cache(ifp) == 0)
 1873                 goto sendpkt;
 1874 
 1875         /*
 1876          * next hop determination.  This routine is derived from ether_output.
 1877          */
 1878 
 1879         /*
 1880          * Address resolution or Neighbor Unreachability Detection
 1881          * for the next hop.
 1882          * At this point, the destination of the packet must be a unicast
 1883          * or an anycast address(i.e. not a multicast).
 1884          */
 1885 
 1886         flags = ((m != NULL) || (lle != NULL)) ? LLE_EXCLUSIVE : 0;
 1887         if (ln == NULL) {
 1888         retry:
 1889                 IF_AFDATA_LOCK(ifp);
 1890                 ln = lla_lookup(LLTABLE6(ifp), flags, (struct sockaddr *)dst);
 1891                 IF_AFDATA_UNLOCK(ifp);
 1892                 if ((ln == NULL) && nd6_is_addr_neighbor(dst, ifp))  {
 1893                         /*
 1894                          * Since nd6_is_addr_neighbor() internally calls nd6_lookup(),
 1895                          * the condition below is not very efficient.  But we believe
 1896                          * it is tolerable, because this should be a rare case.
 1897                          */
 1898                         flags = ND6_CREATE | (m ? ND6_EXCLUSIVE : 0);
 1899                         IF_AFDATA_LOCK(ifp);
 1900                         ln = nd6_lookup(&dst->sin6_addr, flags, ifp);
 1901                         IF_AFDATA_UNLOCK(ifp);
 1902                 }
 1903         } 
 1904         if (ln == NULL) {
 1905                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0 &&
 1906                     !(ND_IFINFO(ifp)->flags & ND6_IFF_PERFORMNUD)) {
 1907                         char ip6buf[INET6_ADDRSTRLEN];
 1908                         log(LOG_DEBUG,
 1909                             "nd6_output: can't allocate llinfo for %s "
 1910                             "(ln=%p)\n",
 1911                             ip6_sprintf(ip6buf, &dst->sin6_addr), ln);
 1912                         senderr(EIO);   /* XXX: good error? */
 1913                 }
 1914                 goto sendpkt;   /* send anyway */
 1915         }
 1916 
 1917         /* We don't have to do link-layer address resolution on a p2p link. */
 1918         if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
 1919             ln->ln_state < ND6_LLINFO_REACHABLE) {
 1920                 if ((flags & LLE_EXCLUSIVE) == 0) {
 1921                         flags |= LLE_EXCLUSIVE;
 1922                         goto retry;
 1923                 }
 1924                 ln->ln_state = ND6_LLINFO_STALE;
 1925                 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
 1926         }
 1927 
 1928         /*
 1929          * The first time we send a packet to a neighbor whose entry is
 1930          * STALE, we have to change the state to DELAY and a sets a timer to
 1931          * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do
 1932          * neighbor unreachability detection on expiration.
 1933          * (RFC 2461 7.3.3)
 1934          */
 1935         if (ln->ln_state == ND6_LLINFO_STALE) {
 1936                 if ((flags & LLE_EXCLUSIVE) == 0) {
 1937                         flags |= LLE_EXCLUSIVE;
 1938                         LLE_RUNLOCK(ln);
 1939                         goto retry;
 1940                 }
 1941                 ln->la_asked = 0;
 1942                 ln->ln_state = ND6_LLINFO_DELAY;
 1943                 nd6_llinfo_settimer_locked(ln, (long)V_nd6_delay * hz);
 1944         }
 1945 
 1946         /*
 1947          * If the neighbor cache entry has a state other than INCOMPLETE
 1948          * (i.e. its link-layer address is already resolved), just
 1949          * send the packet.
 1950          */
 1951         if (ln->ln_state > ND6_LLINFO_INCOMPLETE)
 1952                 goto sendpkt;
 1953 
 1954         /*
 1955          * There is a neighbor cache entry, but no ethernet address
 1956          * response yet.  Append this latest packet to the end of the
 1957          * packet queue in the mbuf, unless the number of the packet
 1958          * does not exceed nd6_maxqueuelen.  When it exceeds nd6_maxqueuelen,
 1959          * the oldest packet in the queue will be removed.
 1960          */
 1961         if (ln->ln_state == ND6_LLINFO_NOSTATE)
 1962                 ln->ln_state = ND6_LLINFO_INCOMPLETE;
 1963 
 1964         if ((flags & LLE_EXCLUSIVE) == 0) {
 1965                 flags |= LLE_EXCLUSIVE;
 1966                 LLE_RUNLOCK(ln);
 1967                 goto retry;
 1968         }
 1969 
 1970         LLE_WLOCK_ASSERT(ln);
 1971 
 1972         if (ln->la_hold) {
 1973                 struct mbuf *m_hold;
 1974                 int i;
 1975                 
 1976                 i = 0;
 1977                 for (m_hold = ln->la_hold; m_hold; m_hold = m_hold->m_nextpkt) {
 1978                         i++;
 1979                         if (m_hold->m_nextpkt == NULL) {
 1980                                 m_hold->m_nextpkt = m;
 1981                                 break;
 1982                         }
 1983                 }
 1984                 while (i >= V_nd6_maxqueuelen) {
 1985                         m_hold = ln->la_hold;
 1986                         ln->la_hold = ln->la_hold->m_nextpkt;
 1987                         m_freem(m_hold);
 1988                         i--;
 1989                 }
 1990         } else {
 1991                 ln->la_hold = m;
 1992         }
 1993 
 1994         /*
 1995          * If there has been no NS for the neighbor after entering the
 1996          * INCOMPLETE state, send the first solicitation.
 1997          */
 1998         if (!ND6_LLINFO_PERMANENT(ln) && ln->la_asked == 0) {
 1999                 ln->la_asked++;
 2000                 
 2001                 nd6_llinfo_settimer_locked(ln,
 2002                     (long)ND_IFINFO(ifp)->retrans * hz / 1000);
 2003                 LLE_WUNLOCK(ln);
 2004                 nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0);
 2005                 if (lle != NULL && ln == lle)
 2006                         LLE_WLOCK(lle);
 2007 
 2008         } else if (lle == NULL || ln != lle) {
 2009                 /*
 2010                  * We did the lookup (no lle arg) so we
 2011                  * need to do the unlock here.
 2012                  */
 2013                 LLE_WUNLOCK(ln);
 2014         }
 2015 
 2016         return (0);
 2017 
 2018   sendpkt:
 2019         /* discard the packet if IPv6 operation is disabled on the interface */
 2020         if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) {
 2021                 error = ENETDOWN; /* better error? */
 2022                 goto bad;
 2023         }
 2024         /*
 2025          * ln is valid and the caller did not pass in 
 2026          * an llentry
 2027          */
 2028         if ((ln != NULL) && (lle == NULL)) {
 2029                 if (flags & LLE_EXCLUSIVE)
 2030                         LLE_WUNLOCK(ln);
 2031                 else
 2032                         LLE_RUNLOCK(ln);
 2033         }
 2034 
 2035 #ifdef MAC
 2036         mac_netinet6_nd6_send(ifp, m);
 2037 #endif
 2038 
 2039         /*
 2040          * If called from nd6_ns_output() (NS), nd6_na_output() (NA),
 2041          * icmp6_redirect_output() (REDIRECT) or from rip6_output() (RS, RA
 2042          * as handled by rtsol and rtadvd), mbufs will be tagged for SeND
 2043          * to be diverted to user space.  When re-injected into the kernel,
 2044          * send_output() will directly dispatch them to the outgoing interface.
 2045          */
 2046         if (send_sendso_input_hook != NULL) {
 2047                 mtag = m_tag_find(m, PACKET_TAG_ND_OUTGOING, NULL);
 2048                 if (mtag != NULL) {
 2049                         ip6 = mtod(m, struct ip6_hdr *);
 2050                         ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
 2051                         /* Use the SEND socket */
 2052                         error = send_sendso_input_hook(m, ifp, SND_OUT,
 2053                             ip6len);
 2054                         /* -1 == no app on SEND socket */
 2055                         if (error == 0 || error != -1)
 2056                             return (error);
 2057                 }
 2058         }
 2059 
 2060         /*
 2061          * We were passed in a pointer to an lle with the lock held 
 2062          * this means that we can't call if_output as we will
 2063          * recurse on the lle lock - so what we do is we create
 2064          * a list of mbufs to send and transmit them in the caller
 2065          * after the lock is dropped
 2066          */
 2067         if (lle != NULL) {
 2068                 if (*chain == NULL)
 2069                         *chain = m;
 2070                 else {
 2071                         struct mbuf *mb;
 2072 
 2073                         /*
 2074                          * append mbuf to end of deferred chain
 2075                          */
 2076                         mb = *chain;
 2077                         while (mb->m_nextpkt != NULL)
 2078                                 mb = mb->m_nextpkt;
 2079                         mb->m_nextpkt = m;
 2080                 }
 2081                 return (error);
 2082         }
 2083         /* Reset layer specific mbuf flags to avoid confusing lower layers. */
 2084         m->m_flags &= ~(M_PROTOFLAGS);  
 2085         if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
 2086                 return ((*ifp->if_output)(origifp, m, (struct sockaddr *)dst,
 2087                     NULL));
 2088         }
 2089         error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, NULL);
 2090         return (error);
 2091 
 2092   bad:
 2093         /*
 2094          * ln is valid and the caller did not pass in 
 2095          * an llentry
 2096          */
 2097         if ((ln != NULL) && (lle == NULL)) {
 2098                 if (flags & LLE_EXCLUSIVE)
 2099                         LLE_WUNLOCK(ln);
 2100                 else
 2101                         LLE_RUNLOCK(ln);
 2102         }
 2103         if (m)
 2104                 m_freem(m);
 2105         return (error);
 2106 }
 2107 #undef senderr
 2108 
 2109 
 2110 int
 2111 nd6_output_flush(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *chain,
 2112     struct sockaddr_in6 *dst, struct route *ro)
 2113 {
 2114         struct mbuf *m, *m_head;
 2115         struct ifnet *outifp;
 2116         int error = 0;
 2117 
 2118         m_head = chain;
 2119         if ((ifp->if_flags & IFF_LOOPBACK) != 0)
 2120                 outifp = origifp;
 2121         else
 2122                 outifp = ifp;
 2123         
 2124         while (m_head) {
 2125                 m = m_head;
 2126                 m_head = m_head->m_nextpkt;
 2127                 error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, ro);                         
 2128         }
 2129 
 2130         /*
 2131          * XXX
 2132          * note that intermediate errors are blindly ignored - but this is 
 2133          * the same convention as used with nd6_output when called by
 2134          * nd6_cache_lladdr
 2135          */
 2136         return (error);
 2137 }       
 2138 
 2139 
 2140 int
 2141 nd6_need_cache(struct ifnet *ifp)
 2142 {
 2143         /*
 2144          * XXX: we currently do not make neighbor cache on any interface
 2145          * other than ARCnet, Ethernet, FDDI and GIF.
 2146          *
 2147          * RFC2893 says:
 2148          * - unidirectional tunnels needs no ND
 2149          */
 2150         switch (ifp->if_type) {
 2151         case IFT_ARCNET:
 2152         case IFT_ETHER:
 2153         case IFT_FDDI:
 2154         case IFT_IEEE1394:
 2155 #ifdef IFT_L2VLAN
 2156         case IFT_L2VLAN:
 2157 #endif
 2158 #ifdef IFT_IEEE80211
 2159         case IFT_IEEE80211:
 2160 #endif
 2161 #ifdef IFT_CARP
 2162         case IFT_CARP:
 2163 #endif
 2164         case IFT_INFINIBAND:
 2165         case IFT_GIF:           /* XXX need more cases? */
 2166         case IFT_PPP:
 2167         case IFT_TUNNEL:
 2168         case IFT_BRIDGE:
 2169         case IFT_PROPVIRTUAL:
 2170                 return (1);
 2171         default:
 2172                 return (0);
 2173         }
 2174 }
 2175 
 2176 /*
 2177  * the callers of this function need to be re-worked to drop
 2178  * the lle lock, drop here for now
 2179  */
 2180 int
 2181 nd6_storelladdr(struct ifnet *ifp, struct mbuf *m,
 2182     struct sockaddr *dst, u_char *desten, struct llentry **lle)
 2183 {
 2184         struct llentry *ln;
 2185 
 2186         *lle = NULL;
 2187         IF_AFDATA_UNLOCK_ASSERT(ifp);
 2188         if (m->m_flags & M_MCAST) {
 2189                 int i;
 2190 
 2191                 switch (ifp->if_type) {
 2192                 case IFT_ETHER:
 2193                 case IFT_FDDI:
 2194 #ifdef IFT_L2VLAN
 2195                 case IFT_L2VLAN:
 2196 #endif
 2197 #ifdef IFT_IEEE80211
 2198                 case IFT_IEEE80211:
 2199 #endif
 2200                 case IFT_BRIDGE:
 2201                 case IFT_ISO88025:
 2202                         ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr,
 2203                                                  desten);
 2204                         return (0);
 2205                 case IFT_IEEE1394:
 2206                         /*
 2207                          * netbsd can use if_broadcastaddr, but we don't do so
 2208                          * to reduce # of ifdef.
 2209                          */
 2210                         for (i = 0; i < ifp->if_addrlen; i++)
 2211                                 desten[i] = ~0;
 2212                         return (0);
 2213                 case IFT_ARCNET:
 2214                         *desten = 0;
 2215                         return (0);
 2216                 default:
 2217                         m_freem(m);
 2218                         return (EAFNOSUPPORT);
 2219                 }
 2220         }
 2221 
 2222 
 2223         /*
 2224          * the entry should have been created in nd6_store_lladdr
 2225          */
 2226         IF_AFDATA_LOCK(ifp);
 2227         ln = lla_lookup(LLTABLE6(ifp), 0, dst);
 2228         IF_AFDATA_UNLOCK(ifp);
 2229         if ((ln == NULL) || !(ln->la_flags & LLE_VALID)) {
 2230                 if (ln != NULL)
 2231                         LLE_RUNLOCK(ln);
 2232                 /* this could happen, if we could not allocate memory */
 2233                 m_freem(m);
 2234                 return (1);
 2235         }
 2236 
 2237         bcopy(&ln->ll_addr, desten, ifp->if_addrlen);
 2238         *lle = ln;
 2239         LLE_RUNLOCK(ln);
 2240         /*
 2241          * A *small* use after free race exists here
 2242          */
 2243         return (0);
 2244 }
 2245 
 2246 static void 
 2247 clear_llinfo_pqueue(struct llentry *ln)
 2248 {
 2249         struct mbuf *m_hold, *m_hold_next;
 2250 
 2251         for (m_hold = ln->la_hold; m_hold; m_hold = m_hold_next) {
 2252                 m_hold_next = m_hold->m_nextpkt;
 2253                 m_freem(m_hold);
 2254         }
 2255 
 2256         ln->la_hold = NULL;
 2257         return;
 2258 }
 2259 
 2260 static int nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS);
 2261 static int nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS);
 2262 #ifdef SYSCTL_DECL
 2263 SYSCTL_DECL(_net_inet6_icmp6);
 2264 #endif
 2265 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
 2266         CTLFLAG_RD, nd6_sysctl_drlist, "");
 2267 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist,
 2268         CTLFLAG_RD, nd6_sysctl_prlist, "");
 2269 SYSCTL_VNET_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXQLEN, nd6_maxqueuelen,
 2270         CTLFLAG_RW, &VNET_NAME(nd6_maxqueuelen), 1, "");
 2271 
 2272 static int
 2273 nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)
 2274 {
 2275         struct in6_defrouter d;
 2276         struct nd_defrouter *dr;
 2277         int error;
 2278 
 2279         if (req->newptr)
 2280                 return (EPERM);
 2281 
 2282         bzero(&d, sizeof(d));
 2283         d.rtaddr.sin6_family = AF_INET6;
 2284         d.rtaddr.sin6_len = sizeof(d.rtaddr);
 2285 
 2286         /*
 2287          * XXX locking
 2288          */
 2289         TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
 2290                 d.rtaddr.sin6_addr = dr->rtaddr;
 2291                 error = sa6_recoverscope(&d.rtaddr);
 2292                 if (error != 0)
 2293                         return (error);
 2294                 d.flags = dr->flags;
 2295                 d.rtlifetime = dr->rtlifetime;
 2296                 d.expire = dr->expire;
 2297                 d.if_index = dr->ifp->if_index;
 2298                 error = SYSCTL_OUT(req, &d, sizeof(d));
 2299                 if (error != 0)
 2300                         return (error);
 2301         }
 2302         return (0);
 2303 }
 2304 
 2305 static int
 2306 nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS)
 2307 {
 2308         struct in6_prefix p;
 2309         struct sockaddr_in6 s6;
 2310         struct nd_prefix *pr;
 2311         struct nd_pfxrouter *pfr;
 2312         time_t maxexpire;
 2313         int error;
 2314         char ip6buf[INET6_ADDRSTRLEN];
 2315 
 2316         if (req->newptr)
 2317                 return (EPERM);
 2318 
 2319         bzero(&p, sizeof(p));
 2320         p.origin = PR_ORIG_RA;
 2321         bzero(&s6, sizeof(s6));
 2322         s6.sin6_family = AF_INET6;
 2323         s6.sin6_len = sizeof(s6);
 2324 
 2325         /*
 2326          * XXX locking
 2327          */
 2328         LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
 2329                 p.prefix = pr->ndpr_prefix;
 2330                 if (sa6_recoverscope(&p.prefix)) {
 2331                         log(LOG_ERR, "scope error in prefix list (%s)\n",
 2332                             ip6_sprintf(ip6buf, &p.prefix.sin6_addr));
 2333                         /* XXX: press on... */
 2334                 }
 2335                 p.raflags = pr->ndpr_raf;
 2336                 p.prefixlen = pr->ndpr_plen;
 2337                 p.vltime = pr->ndpr_vltime;
 2338                 p.pltime = pr->ndpr_pltime;
 2339                 p.if_index = pr->ndpr_ifp->if_index;
 2340                 if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME)
 2341                         p.expire = 0;
 2342                 else {
 2343                         /* XXX: we assume time_t is signed. */
 2344                         maxexpire = (-1) &
 2345                             ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
 2346                         if (pr->ndpr_vltime < maxexpire - pr->ndpr_lastupdate)
 2347                                 p.expire = pr->ndpr_lastupdate +
 2348                                     pr->ndpr_vltime;
 2349                         else
 2350                                 p.expire = maxexpire;
 2351                 }
 2352                 p.refcnt = pr->ndpr_refcnt;
 2353                 p.flags = pr->ndpr_stateflags;
 2354                 p.advrtrs = 0;
 2355                 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry)
 2356                         p.advrtrs++;
 2357                 error = SYSCTL_OUT(req, &p, sizeof(p));
 2358                 if (error != 0)
 2359                         return (error);
 2360                 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) {
 2361                         s6.sin6_addr = pfr->router->rtaddr;
 2362                         if (sa6_recoverscope(&s6))
 2363                                 log(LOG_ERR,
 2364                                     "scope error in prefix list (%s)\n",
 2365                                     ip6_sprintf(ip6buf, &pfr->router->rtaddr));
 2366                         error = SYSCTL_OUT(req, &s6, sizeof(s6));
 2367                         if (error != 0)
 2368                                 return (error);
 2369                 }
 2370         }
 2371         return (0);
 2372 }

Cache object: 29bb29ab4db549bcceacc2a816f810e0


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.