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

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    1 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $KAME: nd6.c,v 1.144 2001/05/24 07:44:00 itojun Exp $
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/9.0/sys/netinet6/nd6.c 228246 2011-12-03 22:15:42Z hrs $");
   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);
  178         bzero(nd, sizeof(*nd));
  179 
  180         nd->initialized = 1;
  181 
  182         nd->chlim = IPV6_DEFHLIM;
  183         nd->basereachable = REACHABLE_TIME;
  184         nd->reachable = ND_COMPUTE_RTIME(nd->basereachable);
  185         nd->retrans = RETRANS_TIMER;
  186 
  187         nd->flags = ND6_IFF_PERFORMNUD;
  188 
  189         /* A loopback interface always has ND6_IFF_AUTO_LINKLOCAL. */
  190         if (V_ip6_auto_linklocal || (ifp->if_flags & IFF_LOOPBACK))
  191                 nd->flags |= ND6_IFF_AUTO_LINKLOCAL;
  192 
  193         /* A loopback interface does not need to accept RTADV. */
  194         if (V_ip6_accept_rtadv && !(ifp->if_flags & IFF_LOOPBACK))
  195                 nd->flags |= ND6_IFF_ACCEPT_RTADV;
  196         if (V_ip6_no_radr && !(ifp->if_flags & IFF_LOOPBACK))
  197                 nd->flags |= ND6_IFF_NO_RADR;
  198 
  199         /* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */
  200         nd6_setmtu0(ifp, nd);
  201 
  202         return nd;
  203 }
  204 
  205 void
  206 nd6_ifdetach(struct nd_ifinfo *nd)
  207 {
  208 
  209         free(nd, M_IP6NDP);
  210 }
  211 
  212 /*
  213  * Reset ND level link MTU. This function is called when the physical MTU
  214  * changes, which means we might have to adjust the ND level MTU.
  215  */
  216 void
  217 nd6_setmtu(struct ifnet *ifp)
  218 {
  219 
  220         nd6_setmtu0(ifp, ND_IFINFO(ifp));
  221 }
  222 
  223 /* XXX todo: do not maintain copy of ifp->if_mtu in ndi->maxmtu */
  224 void
  225 nd6_setmtu0(struct ifnet *ifp, struct nd_ifinfo *ndi)
  226 {
  227         u_int32_t omaxmtu;
  228 
  229         omaxmtu = ndi->maxmtu;
  230 
  231         switch (ifp->if_type) {
  232         case IFT_ARCNET:
  233                 ndi->maxmtu = MIN(ARC_PHDS_MAXMTU, ifp->if_mtu); /* RFC2497 */
  234                 break;
  235         case IFT_FDDI:
  236                 ndi->maxmtu = MIN(FDDIIPMTU, ifp->if_mtu); /* RFC2467 */
  237                 break;
  238         case IFT_ISO88025:
  239                  ndi->maxmtu = MIN(ISO88025_MAX_MTU, ifp->if_mtu);
  240                  break;
  241         default:
  242                 ndi->maxmtu = ifp->if_mtu;
  243                 break;
  244         }
  245 
  246         /*
  247          * Decreasing the interface MTU under IPV6 minimum MTU may cause
  248          * undesirable situation.  We thus notify the operator of the change
  249          * explicitly.  The check for omaxmtu is necessary to restrict the
  250          * log to the case of changing the MTU, not initializing it.
  251          */
  252         if (omaxmtu >= IPV6_MMTU && ndi->maxmtu < IPV6_MMTU) {
  253                 log(LOG_NOTICE, "nd6_setmtu0: "
  254                     "new link MTU on %s (%lu) is too small for IPv6\n",
  255                     if_name(ifp), (unsigned long)ndi->maxmtu);
  256         }
  257 
  258         if (ndi->maxmtu > V_in6_maxmtu)
  259                 in6_setmaxmtu(); /* check all interfaces just in case */
  260 
  261 }
  262 
  263 void
  264 nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts)
  265 {
  266 
  267         bzero(ndopts, sizeof(*ndopts));
  268         ndopts->nd_opts_search = (struct nd_opt_hdr *)opt;
  269         ndopts->nd_opts_last
  270                 = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len);
  271 
  272         if (icmp6len == 0) {
  273                 ndopts->nd_opts_done = 1;
  274                 ndopts->nd_opts_search = NULL;
  275         }
  276 }
  277 
  278 /*
  279  * Take one ND option.
  280  */
  281 struct nd_opt_hdr *
  282 nd6_option(union nd_opts *ndopts)
  283 {
  284         struct nd_opt_hdr *nd_opt;
  285         int olen;
  286 
  287         if (ndopts == NULL)
  288                 panic("ndopts == NULL in nd6_option");
  289         if (ndopts->nd_opts_last == NULL)
  290                 panic("uninitialized ndopts in nd6_option");
  291         if (ndopts->nd_opts_search == NULL)
  292                 return NULL;
  293         if (ndopts->nd_opts_done)
  294                 return NULL;
  295 
  296         nd_opt = ndopts->nd_opts_search;
  297 
  298         /* make sure nd_opt_len is inside the buffer */
  299         if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) {
  300                 bzero(ndopts, sizeof(*ndopts));
  301                 return NULL;
  302         }
  303 
  304         olen = nd_opt->nd_opt_len << 3;
  305         if (olen == 0) {
  306                 /*
  307                  * Message validation requires that all included
  308                  * options have a length that is greater than zero.
  309                  */
  310                 bzero(ndopts, sizeof(*ndopts));
  311                 return NULL;
  312         }
  313 
  314         ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen);
  315         if (ndopts->nd_opts_search > ndopts->nd_opts_last) {
  316                 /* option overruns the end of buffer, invalid */
  317                 bzero(ndopts, sizeof(*ndopts));
  318                 return NULL;
  319         } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) {
  320                 /* reached the end of options chain */
  321                 ndopts->nd_opts_done = 1;
  322                 ndopts->nd_opts_search = NULL;
  323         }
  324         return nd_opt;
  325 }
  326 
  327 /*
  328  * Parse multiple ND options.
  329  * This function is much easier to use, for ND routines that do not need
  330  * multiple options of the same type.
  331  */
  332 int
  333 nd6_options(union nd_opts *ndopts)
  334 {
  335         struct nd_opt_hdr *nd_opt;
  336         int i = 0;
  337 
  338         if (ndopts == NULL)
  339                 panic("ndopts == NULL in nd6_options");
  340         if (ndopts->nd_opts_last == NULL)
  341                 panic("uninitialized ndopts in nd6_options");
  342         if (ndopts->nd_opts_search == NULL)
  343                 return 0;
  344 
  345         while (1) {
  346                 nd_opt = nd6_option(ndopts);
  347                 if (nd_opt == NULL && ndopts->nd_opts_last == NULL) {
  348                         /*
  349                          * Message validation requires that all included
  350                          * options have a length that is greater than zero.
  351                          */
  352                         ICMP6STAT_INC(icp6s_nd_badopt);
  353                         bzero(ndopts, sizeof(*ndopts));
  354                         return -1;
  355                 }
  356 
  357                 if (nd_opt == NULL)
  358                         goto skip1;
  359 
  360                 switch (nd_opt->nd_opt_type) {
  361                 case ND_OPT_SOURCE_LINKADDR:
  362                 case ND_OPT_TARGET_LINKADDR:
  363                 case ND_OPT_MTU:
  364                 case ND_OPT_REDIRECTED_HEADER:
  365                         if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
  366                                 nd6log((LOG_INFO,
  367                                     "duplicated ND6 option found (type=%d)\n",
  368                                     nd_opt->nd_opt_type));
  369                                 /* XXX bark? */
  370                         } else {
  371                                 ndopts->nd_opt_array[nd_opt->nd_opt_type]
  372                                         = nd_opt;
  373                         }
  374                         break;
  375                 case ND_OPT_PREFIX_INFORMATION:
  376                         if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) {
  377                                 ndopts->nd_opt_array[nd_opt->nd_opt_type]
  378                                         = nd_opt;
  379                         }
  380                         ndopts->nd_opts_pi_end =
  381                                 (struct nd_opt_prefix_info *)nd_opt;
  382                         break;
  383                 default:
  384                         /*
  385                          * Unknown options must be silently ignored,
  386                          * to accomodate future extension to the protocol.
  387                          */
  388                         nd6log((LOG_DEBUG,
  389                             "nd6_options: unsupported option %d - "
  390                             "option ignored\n", nd_opt->nd_opt_type));
  391                 }
  392 
  393 skip1:
  394                 i++;
  395                 if (i > V_nd6_maxndopt) {
  396                         ICMP6STAT_INC(icp6s_nd_toomanyopt);
  397                         nd6log((LOG_INFO, "too many loop in nd opt\n"));
  398                         break;
  399                 }
  400 
  401                 if (ndopts->nd_opts_done)
  402                         break;
  403         }
  404 
  405         return 0;
  406 }
  407 
  408 /*
  409  * ND6 timer routine to handle ND6 entries
  410  */
  411 void
  412 nd6_llinfo_settimer_locked(struct llentry *ln, long tick)
  413 {
  414         int canceled;
  415 
  416         LLE_WLOCK_ASSERT(ln);
  417 
  418         if (tick < 0) {
  419                 ln->la_expire = 0;
  420                 ln->ln_ntick = 0;
  421                 canceled = callout_stop(&ln->ln_timer_ch);
  422         } else {
  423                 ln->la_expire = time_second + tick / hz;
  424                 LLE_ADDREF(ln);
  425                 if (tick > INT_MAX) {
  426                         ln->ln_ntick = tick - INT_MAX;
  427                         canceled = callout_reset(&ln->ln_timer_ch, INT_MAX,
  428                             nd6_llinfo_timer, ln);
  429                 } else {
  430                         ln->ln_ntick = 0;
  431                         canceled = callout_reset(&ln->ln_timer_ch, tick,
  432                             nd6_llinfo_timer, ln);
  433                 }
  434         }
  435         if (canceled)
  436                 LLE_REMREF(ln);
  437 }
  438 
  439 void
  440 nd6_llinfo_settimer(struct llentry *ln, long tick)
  441 {
  442 
  443         LLE_WLOCK(ln);
  444         nd6_llinfo_settimer_locked(ln, tick);
  445         LLE_WUNLOCK(ln);
  446 }
  447 
  448 static void
  449 nd6_llinfo_timer(void *arg)
  450 {
  451         struct llentry *ln;
  452         struct in6_addr *dst;
  453         struct ifnet *ifp;
  454         struct nd_ifinfo *ndi = NULL;
  455 
  456         KASSERT(arg != NULL, ("%s: arg NULL", __func__));
  457         ln = (struct llentry *)arg;
  458         LLE_WLOCK_ASSERT(ln);
  459         ifp = ln->lle_tbl->llt_ifp;
  460 
  461         CURVNET_SET(ifp->if_vnet);
  462 
  463         if (ln->ln_ntick > 0) {
  464                 if (ln->ln_ntick > INT_MAX) {
  465                         ln->ln_ntick -= INT_MAX;
  466                         nd6_llinfo_settimer_locked(ln, INT_MAX);
  467                 } else {
  468                         ln->ln_ntick = 0;
  469                         nd6_llinfo_settimer_locked(ln, ln->ln_ntick);
  470                 }
  471                 goto done;
  472         }
  473 
  474         ndi = ND_IFINFO(ifp);
  475         dst = &L3_ADDR_SIN6(ln)->sin6_addr;
  476         if (ln->la_flags & LLE_STATIC) {
  477                 goto done;
  478         }
  479 
  480         if (ln->la_flags & LLE_DELETED) {
  481                 (void)nd6_free(ln, 0);
  482                 ln = NULL;
  483                 goto done;
  484         }
  485 
  486         switch (ln->ln_state) {
  487         case ND6_LLINFO_INCOMPLETE:
  488                 if (ln->la_asked < V_nd6_mmaxtries) {
  489                         ln->la_asked++;
  490                         nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
  491                         LLE_WUNLOCK(ln);
  492                         nd6_ns_output(ifp, NULL, dst, ln, 0);
  493                         LLE_WLOCK(ln);
  494                 } else {
  495                         struct mbuf *m = ln->la_hold;
  496                         if (m) {
  497                                 struct mbuf *m0;
  498 
  499                                 /*
  500                                  * assuming every packet in la_hold has the
  501                                  * same IP header.  Send error after unlock.
  502                                  */
  503                                 m0 = m->m_nextpkt;
  504                                 m->m_nextpkt = NULL;
  505                                 ln->la_hold = m0;
  506                                 clear_llinfo_pqueue(ln);
  507                         }
  508                         (void)nd6_free(ln, 0);
  509                         ln = NULL;
  510                         if (m != NULL)
  511                                 icmp6_error2(m, ICMP6_DST_UNREACH,
  512                                     ICMP6_DST_UNREACH_ADDR, 0, ifp);
  513                 }
  514                 break;
  515         case ND6_LLINFO_REACHABLE:
  516                 if (!ND6_LLINFO_PERMANENT(ln)) {
  517                         ln->ln_state = ND6_LLINFO_STALE;
  518                         nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
  519                 }
  520                 break;
  521 
  522         case ND6_LLINFO_STALE:
  523                 /* Garbage Collection(RFC 2461 5.3) */
  524                 if (!ND6_LLINFO_PERMANENT(ln)) {
  525                         (void)nd6_free(ln, 1);
  526                         ln = NULL;
  527                 }
  528                 break;
  529 
  530         case ND6_LLINFO_DELAY:
  531                 if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) {
  532                         /* We need NUD */
  533                         ln->la_asked = 1;
  534                         ln->ln_state = ND6_LLINFO_PROBE;
  535                         nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
  536                         LLE_WUNLOCK(ln);
  537                         nd6_ns_output(ifp, dst, dst, ln, 0);
  538                         LLE_WLOCK(ln);
  539                 } else {
  540                         ln->ln_state = ND6_LLINFO_STALE; /* XXX */
  541                         nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
  542                 }
  543                 break;
  544         case ND6_LLINFO_PROBE:
  545                 if (ln->la_asked < V_nd6_umaxtries) {
  546                         ln->la_asked++;
  547                         nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
  548                         LLE_WUNLOCK(ln);
  549                         nd6_ns_output(ifp, dst, dst, ln, 0);
  550                         LLE_WLOCK(ln);
  551                 } else {
  552                         (void)nd6_free(ln, 0);
  553                         ln = NULL;
  554                 }
  555                 break;
  556         default:
  557                 panic("%s: paths in a dark night can be confusing: %d",
  558                     __func__, ln->ln_state);
  559         }
  560 done:
  561         if (ln != NULL)
  562                 LLE_FREE_LOCKED(ln);
  563         CURVNET_RESTORE();
  564 }
  565 
  566 
  567 /*
  568  * ND6 timer routine to expire default route list and prefix list
  569  */
  570 void
  571 nd6_timer(void *arg)
  572 {
  573         CURVNET_SET((struct vnet *) arg);
  574         int s;
  575         struct nd_defrouter *dr;
  576         struct nd_prefix *pr;
  577         struct in6_ifaddr *ia6, *nia6;
  578         struct in6_addrlifetime *lt6;
  579 
  580         callout_reset(&V_nd6_timer_ch, V_nd6_prune * hz,
  581             nd6_timer, curvnet);
  582 
  583         /* expire default router list */
  584         s = splnet();
  585         dr = TAILQ_FIRST(&V_nd_defrouter);
  586         while (dr) {
  587                 if (dr->expire && dr->expire < time_second) {
  588                         struct nd_defrouter *t;
  589                         t = TAILQ_NEXT(dr, dr_entry);
  590                         defrtrlist_del(dr);
  591                         dr = t;
  592                 } else {
  593                         dr = TAILQ_NEXT(dr, dr_entry);
  594                 }
  595         }
  596 
  597         /*
  598          * expire interface addresses.
  599          * in the past the loop was inside prefix expiry processing.
  600          * However, from a stricter speci-confrmance standpoint, we should
  601          * rather separate address lifetimes and prefix lifetimes.
  602          *
  603          * XXXRW: in6_ifaddrhead locking.
  604          */
  605   addrloop:
  606         TAILQ_FOREACH_SAFE(ia6, &V_in6_ifaddrhead, ia_link, nia6) {
  607                 /* check address lifetime */
  608                 lt6 = &ia6->ia6_lifetime;
  609                 if (IFA6_IS_INVALID(ia6)) {
  610                         int regen = 0;
  611 
  612                         /*
  613                          * If the expiring address is temporary, try
  614                          * regenerating a new one.  This would be useful when
  615                          * we suspended a laptop PC, then turned it on after a
  616                          * period that could invalidate all temporary
  617                          * addresses.  Although we may have to restart the
  618                          * loop (see below), it must be after purging the
  619                          * address.  Otherwise, we'd see an infinite loop of
  620                          * regeneration.
  621                          */
  622                         if (V_ip6_use_tempaddr &&
  623                             (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
  624                                 if (regen_tmpaddr(ia6) == 0)
  625                                         regen = 1;
  626                         }
  627 
  628                         in6_purgeaddr(&ia6->ia_ifa);
  629 
  630                         if (regen)
  631                                 goto addrloop; /* XXX: see below */
  632                 } else if (IFA6_IS_DEPRECATED(ia6)) {
  633                         int oldflags = ia6->ia6_flags;
  634 
  635                         ia6->ia6_flags |= IN6_IFF_DEPRECATED;
  636 
  637                         /*
  638                          * If a temporary address has just become deprecated,
  639                          * regenerate a new one if possible.
  640                          */
  641                         if (V_ip6_use_tempaddr &&
  642                             (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
  643                             (oldflags & IN6_IFF_DEPRECATED) == 0) {
  644 
  645                                 if (regen_tmpaddr(ia6) == 0) {
  646                                         /*
  647                                          * A new temporary address is
  648                                          * generated.
  649                                          * XXX: this means the address chain
  650                                          * has changed while we are still in
  651                                          * the loop.  Although the change
  652                                          * would not cause disaster (because
  653                                          * it's not a deletion, but an
  654                                          * addition,) we'd rather restart the
  655                                          * loop just for safety.  Or does this
  656                                          * significantly reduce performance??
  657                                          */
  658                                         goto addrloop;
  659                                 }
  660                         }
  661                 } else {
  662                         /*
  663                          * A new RA might have made a deprecated address
  664                          * preferred.
  665                          */
  666                         ia6->ia6_flags &= ~IN6_IFF_DEPRECATED;
  667                 }
  668         }
  669 
  670         /* expire prefix list */
  671         pr = V_nd_prefix.lh_first;
  672         while (pr) {
  673                 /*
  674                  * check prefix lifetime.
  675                  * since pltime is just for autoconf, pltime processing for
  676                  * prefix is not necessary.
  677                  */
  678                 if (pr->ndpr_vltime != ND6_INFINITE_LIFETIME &&
  679                     time_second - pr->ndpr_lastupdate > pr->ndpr_vltime) {
  680                         struct nd_prefix *t;
  681                         t = pr->ndpr_next;
  682 
  683                         /*
  684                          * address expiration and prefix expiration are
  685                          * separate.  NEVER perform in6_purgeaddr here.
  686                          */
  687 
  688                         prelist_remove(pr);
  689                         pr = t;
  690                 } else
  691                         pr = pr->ndpr_next;
  692         }
  693         splx(s);
  694         CURVNET_RESTORE();
  695 }
  696 
  697 /*
  698  * ia6 - deprecated/invalidated temporary address
  699  */
  700 static int
  701 regen_tmpaddr(struct in6_ifaddr *ia6)
  702 {
  703         struct ifaddr *ifa;
  704         struct ifnet *ifp;
  705         struct in6_ifaddr *public_ifa6 = NULL;
  706 
  707         ifp = ia6->ia_ifa.ifa_ifp;
  708         IF_ADDR_LOCK(ifp);
  709         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  710                 struct in6_ifaddr *it6;
  711 
  712                 if (ifa->ifa_addr->sa_family != AF_INET6)
  713                         continue;
  714 
  715                 it6 = (struct in6_ifaddr *)ifa;
  716 
  717                 /* ignore no autoconf addresses. */
  718                 if ((it6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
  719                         continue;
  720 
  721                 /* ignore autoconf addresses with different prefixes. */
  722                 if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr)
  723                         continue;
  724 
  725                 /*
  726                  * Now we are looking at an autoconf address with the same
  727                  * prefix as ours.  If the address is temporary and is still
  728                  * preferred, do not create another one.  It would be rare, but
  729                  * could happen, for example, when we resume a laptop PC after
  730                  * a long period.
  731                  */
  732                 if ((it6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
  733                     !IFA6_IS_DEPRECATED(it6)) {
  734                         public_ifa6 = NULL;
  735                         break;
  736                 }
  737 
  738                 /*
  739                  * This is a public autoconf address that has the same prefix
  740                  * as ours.  If it is preferred, keep it.  We can't break the
  741                  * loop here, because there may be a still-preferred temporary
  742                  * address with the prefix.
  743                  */
  744                 if (!IFA6_IS_DEPRECATED(it6))
  745                     public_ifa6 = it6;
  746 
  747                 if (public_ifa6 != NULL)
  748                         ifa_ref(&public_ifa6->ia_ifa);
  749         }
  750         IF_ADDR_UNLOCK(ifp);
  751 
  752         if (public_ifa6 != NULL) {
  753                 int e;
  754 
  755                 if ((e = in6_tmpifadd(public_ifa6, 0, 0)) != 0) {
  756                         ifa_free(&public_ifa6->ia_ifa);
  757                         log(LOG_NOTICE, "regen_tmpaddr: failed to create a new"
  758                             " tmp addr,errno=%d\n", e);
  759                         return (-1);
  760                 }
  761                 ifa_free(&public_ifa6->ia_ifa);
  762                 return (0);
  763         }
  764 
  765         return (-1);
  766 }
  767 
  768 /*
  769  * Nuke neighbor cache/prefix/default router management table, right before
  770  * ifp goes away.
  771  */
  772 void
  773 nd6_purge(struct ifnet *ifp)
  774 {
  775         struct nd_defrouter *dr, *ndr;
  776         struct nd_prefix *pr, *npr;
  777 
  778         /*
  779          * Nuke default router list entries toward ifp.
  780          * We defer removal of default router list entries that is installed
  781          * in the routing table, in order to keep additional side effects as
  782          * small as possible.
  783          */
  784         for (dr = TAILQ_FIRST(&V_nd_defrouter); dr; dr = ndr) {
  785                 ndr = TAILQ_NEXT(dr, dr_entry);
  786                 if (dr->installed)
  787                         continue;
  788 
  789                 if (dr->ifp == ifp)
  790                         defrtrlist_del(dr);
  791         }
  792 
  793         for (dr = TAILQ_FIRST(&V_nd_defrouter); dr; dr = ndr) {
  794                 ndr = TAILQ_NEXT(dr, dr_entry);
  795                 if (!dr->installed)
  796                         continue;
  797 
  798                 if (dr->ifp == ifp)
  799                         defrtrlist_del(dr);
  800         }
  801 
  802         /* Nuke prefix list entries toward ifp */
  803         for (pr = V_nd_prefix.lh_first; pr; pr = npr) {
  804                 npr = pr->ndpr_next;
  805                 if (pr->ndpr_ifp == ifp) {
  806                         /*
  807                          * Because if_detach() does *not* release prefixes
  808                          * while purging addresses the reference count will
  809                          * still be above zero. We therefore reset it to
  810                          * make sure that the prefix really gets purged.
  811                          */
  812                         pr->ndpr_refcnt = 0;
  813 
  814                         /*
  815                          * Previously, pr->ndpr_addr is removed as well,
  816                          * but I strongly believe we don't have to do it.
  817                          * nd6_purge() is only called from in6_ifdetach(),
  818                          * which removes all the associated interface addresses
  819                          * by itself.
  820                          * (jinmei@kame.net 20010129)
  821                          */
  822                         prelist_remove(pr);
  823                 }
  824         }
  825 
  826         /* cancel default outgoing interface setting */
  827         if (V_nd6_defifindex == ifp->if_index)
  828                 nd6_setdefaultiface(0);
  829 
  830         if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
  831                 /* Refresh default router list. */
  832                 defrouter_select();
  833         }
  834 
  835         /* XXXXX
  836          * We do not nuke the neighbor cache entries here any more
  837          * because the neighbor cache is kept in if_afdata[AF_INET6].
  838          * nd6_purge() is invoked by in6_ifdetach() which is called
  839          * from if_detach() where everything gets purged. So let
  840          * in6_domifdetach() do the actual L2 table purging work.
  841          */
  842 }
  843 
  844 /* 
  845  * the caller acquires and releases the lock on the lltbls
  846  * Returns the llentry locked
  847  */
  848 struct llentry *
  849 nd6_lookup(struct in6_addr *addr6, int flags, struct ifnet *ifp)
  850 {
  851         struct sockaddr_in6 sin6;
  852         struct llentry *ln;
  853         int llflags;
  854         
  855         bzero(&sin6, sizeof(sin6));
  856         sin6.sin6_len = sizeof(struct sockaddr_in6);
  857         sin6.sin6_family = AF_INET6;
  858         sin6.sin6_addr = *addr6;
  859 
  860         IF_AFDATA_LOCK_ASSERT(ifp);
  861 
  862         llflags = 0;
  863         if (flags & ND6_CREATE)
  864             llflags |= LLE_CREATE;
  865         if (flags & ND6_EXCLUSIVE)
  866             llflags |= LLE_EXCLUSIVE;   
  867         
  868         ln = lla_lookup(LLTABLE6(ifp), llflags, (struct sockaddr *)&sin6);
  869         if ((ln != NULL) && (llflags & LLE_CREATE))
  870                 ln->ln_state = ND6_LLINFO_NOSTATE;
  871         
  872         return (ln);
  873 }
  874 
  875 /*
  876  * Test whether a given IPv6 address is a neighbor or not, ignoring
  877  * the actual neighbor cache.  The neighbor cache is ignored in order
  878  * to not reenter the routing code from within itself.
  879  */
  880 static int
  881 nd6_is_new_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp)
  882 {
  883         struct nd_prefix *pr;
  884         struct ifaddr *dstaddr;
  885 
  886         /*
  887          * A link-local address is always a neighbor.
  888          * XXX: a link does not necessarily specify a single interface.
  889          */
  890         if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr)) {
  891                 struct sockaddr_in6 sin6_copy;
  892                 u_int32_t zone;
  893 
  894                 /*
  895                  * We need sin6_copy since sa6_recoverscope() may modify the
  896                  * content (XXX).
  897                  */
  898                 sin6_copy = *addr;
  899                 if (sa6_recoverscope(&sin6_copy))
  900                         return (0); /* XXX: should be impossible */
  901                 if (in6_setscope(&sin6_copy.sin6_addr, ifp, &zone))
  902                         return (0);
  903                 if (sin6_copy.sin6_scope_id == zone)
  904                         return (1);
  905                 else
  906                         return (0);
  907         }
  908 
  909         /*
  910          * If the address matches one of our addresses,
  911          * it should be a neighbor.
  912          * If the address matches one of our on-link prefixes, it should be a
  913          * neighbor.
  914          */
  915         for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
  916                 if (pr->ndpr_ifp != ifp)
  917                         continue;
  918 
  919                 if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) {
  920                         struct rtentry *rt;
  921                         rt = rtalloc1((struct sockaddr *)&pr->ndpr_prefix, 0, 0);
  922                         if (rt == NULL)
  923                                 continue;
  924                         /*
  925                          * This is the case where multiple interfaces
  926                          * have the same prefix, but only one is installed 
  927                          * into the routing table and that prefix entry
  928                          * is not the one being examined here. In the case
  929                          * where RADIX_MPATH is enabled, multiple route
  930                          * entries (of the same rt_key value) will be 
  931                          * installed because the interface addresses all
  932                          * differ.
  933                          */
  934                         if (!IN6_ARE_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
  935                                &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr)) {
  936                                 RTFREE_LOCKED(rt);
  937                                 continue;
  938                         }
  939                         RTFREE_LOCKED(rt);
  940                 }
  941 
  942                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
  943                     &addr->sin6_addr, &pr->ndpr_mask))
  944                         return (1);
  945         }
  946 
  947         /*
  948          * If the address is assigned on the node of the other side of
  949          * a p2p interface, the address should be a neighbor.
  950          */
  951         dstaddr = ifa_ifwithdstaddr((struct sockaddr *)addr);
  952         if (dstaddr != NULL) {
  953                 if (dstaddr->ifa_ifp == ifp) {
  954                         ifa_free(dstaddr);
  955                         return (1);
  956                 }
  957                 ifa_free(dstaddr);
  958         }
  959 
  960         /*
  961          * If the default router list is empty, all addresses are regarded
  962          * as on-link, and thus, as a neighbor.
  963          */
  964         if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV &&
  965             TAILQ_FIRST(&V_nd_defrouter) == NULL &&
  966             V_nd6_defifindex == ifp->if_index) {
  967                 return (1);
  968         }
  969 
  970         return (0);
  971 }
  972 
  973 
  974 /*
  975  * Detect if a given IPv6 address identifies a neighbor on a given link.
  976  * XXX: should take care of the destination of a p2p link?
  977  */
  978 int
  979 nd6_is_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp)
  980 {
  981         struct llentry *lle;
  982         int rc = 0;
  983 
  984         IF_AFDATA_UNLOCK_ASSERT(ifp);
  985         if (nd6_is_new_addr_neighbor(addr, ifp))
  986                 return (1);
  987 
  988         /*
  989          * Even if the address matches none of our addresses, it might be
  990          * in the neighbor cache.
  991          */
  992         IF_AFDATA_LOCK(ifp);
  993         if ((lle = nd6_lookup(&addr->sin6_addr, 0, ifp)) != NULL) {
  994                 LLE_RUNLOCK(lle);
  995                 rc = 1;
  996         }
  997         IF_AFDATA_UNLOCK(ifp);
  998         return (rc);
  999 }
 1000 
 1001 /*
 1002  * Free an nd6 llinfo entry.
 1003  * Since the function would cause significant changes in the kernel, DO NOT
 1004  * make it global, unless you have a strong reason for the change, and are sure
 1005  * that the change is safe.
 1006  */
 1007 static struct llentry *
 1008 nd6_free(struct llentry *ln, int gc)
 1009 {
 1010         struct llentry *next;
 1011         struct nd_defrouter *dr;
 1012         struct ifnet *ifp;
 1013 
 1014         LLE_WLOCK_ASSERT(ln);
 1015 
 1016         /*
 1017          * we used to have pfctlinput(PRC_HOSTDEAD) here.
 1018          * even though it is not harmful, it was not really necessary.
 1019          */
 1020 
 1021         /* cancel timer */
 1022         nd6_llinfo_settimer_locked(ln, -1);
 1023 
 1024         ifp = ln->lle_tbl->llt_ifp;
 1025 
 1026         if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
 1027                 dr = defrouter_lookup(&L3_ADDR_SIN6(ln)->sin6_addr, ifp);
 1028 
 1029                 if (dr != NULL && dr->expire &&
 1030                     ln->ln_state == ND6_LLINFO_STALE && gc) {
 1031                         /*
 1032                          * If the reason for the deletion is just garbage
 1033                          * collection, and the neighbor is an active default
 1034                          * router, do not delete it.  Instead, reset the GC
 1035                          * timer using the router's lifetime.
 1036                          * Simply deleting the entry would affect default
 1037                          * router selection, which is not necessarily a good
 1038                          * thing, especially when we're using router preference
 1039                          * values.
 1040                          * XXX: the check for ln_state would be redundant,
 1041                          *      but we intentionally keep it just in case.
 1042                          */
 1043                         if (dr->expire > time_second)
 1044                                 nd6_llinfo_settimer_locked(ln,
 1045                                     (dr->expire - time_second) * hz);
 1046                         else
 1047                                 nd6_llinfo_settimer_locked(ln,
 1048                                     (long)V_nd6_gctimer * hz);
 1049 
 1050                         next = LIST_NEXT(ln, lle_next);
 1051                         LLE_REMREF(ln);
 1052                         LLE_WUNLOCK(ln);
 1053                         return (next);
 1054                 }
 1055 
 1056                 if (dr) {
 1057                         /*
 1058                          * Unreachablity of a router might affect the default
 1059                          * router selection and on-link detection of advertised
 1060                          * prefixes.
 1061                          */
 1062 
 1063                         /*
 1064                          * Temporarily fake the state to choose a new default
 1065                          * router and to perform on-link determination of
 1066                          * prefixes correctly.
 1067                          * Below the state will be set correctly,
 1068                          * or the entry itself will be deleted.
 1069                          */
 1070                         ln->ln_state = ND6_LLINFO_INCOMPLETE;
 1071                 }
 1072 
 1073                 if (ln->ln_router || dr) {
 1074 
 1075                         /*
 1076                          * We need to unlock to avoid a LOR with rt6_flush() with the
 1077                          * rnh and for the calls to pfxlist_onlink_check() and
 1078                          * defrouter_select() in the block further down for calls
 1079                          * into nd6_lookup().  We still hold a ref.
 1080                          */
 1081                         LLE_WUNLOCK(ln);
 1082 
 1083                         /*
 1084                          * rt6_flush must be called whether or not the neighbor
 1085                          * is in the Default Router List.
 1086                          * See a corresponding comment in nd6_na_input().
 1087                          */
 1088                         rt6_flush(&L3_ADDR_SIN6(ln)->sin6_addr, ifp);
 1089                 }
 1090 
 1091                 if (dr) {
 1092                         /*
 1093                          * Since defrouter_select() does not affect the
 1094                          * on-link determination and MIP6 needs the check
 1095                          * before the default router selection, we perform
 1096                          * the check now.
 1097                          */
 1098                         pfxlist_onlink_check();
 1099 
 1100                         /*
 1101                          * Refresh default router list.
 1102                          */
 1103                         defrouter_select();
 1104                 }
 1105 
 1106                 if (ln->ln_router || dr)
 1107                         LLE_WLOCK(ln);
 1108         }
 1109 
 1110         /*
 1111          * Before deleting the entry, remember the next entry as the
 1112          * return value.  We need this because pfxlist_onlink_check() above
 1113          * might have freed other entries (particularly the old next entry) as
 1114          * a side effect (XXX).
 1115          */
 1116         next = LIST_NEXT(ln, lle_next);
 1117 
 1118         /*
 1119          * Save to unlock. We still hold an extra reference and will not
 1120          * free(9) in llentry_free() if someone else holds one as well.
 1121          */
 1122         LLE_WUNLOCK(ln);
 1123         IF_AFDATA_LOCK(ifp);
 1124         LLE_WLOCK(ln);
 1125         LLE_REMREF(ln);
 1126         llentry_free(ln);
 1127         IF_AFDATA_UNLOCK(ifp);
 1128 
 1129         return (next);
 1130 }
 1131 
 1132 /*
 1133  * Upper-layer reachability hint for Neighbor Unreachability Detection.
 1134  *
 1135  * XXX cost-effective methods?
 1136  */
 1137 void
 1138 nd6_nud_hint(struct rtentry *rt, struct in6_addr *dst6, int force)
 1139 {
 1140         struct llentry *ln;
 1141         struct ifnet *ifp;
 1142 
 1143         if ((dst6 == NULL) || (rt == NULL))
 1144                 return;
 1145 
 1146         ifp = rt->rt_ifp;
 1147         IF_AFDATA_LOCK(ifp);
 1148         ln = nd6_lookup(dst6, ND6_EXCLUSIVE, NULL);
 1149         IF_AFDATA_UNLOCK(ifp);
 1150         if (ln == NULL)
 1151                 return;
 1152 
 1153         if (ln->ln_state < ND6_LLINFO_REACHABLE)
 1154                 goto done;
 1155 
 1156         /*
 1157          * if we get upper-layer reachability confirmation many times,
 1158          * it is possible we have false information.
 1159          */
 1160         if (!force) {
 1161                 ln->ln_byhint++;
 1162                 if (ln->ln_byhint > V_nd6_maxnudhint) {
 1163                         goto done;
 1164                 }
 1165         }
 1166 
 1167         ln->ln_state = ND6_LLINFO_REACHABLE;
 1168         if (!ND6_LLINFO_PERMANENT(ln)) {
 1169                 nd6_llinfo_settimer_locked(ln,
 1170                     (long)ND_IFINFO(rt->rt_ifp)->reachable * hz);
 1171         }
 1172 done:
 1173         LLE_WUNLOCK(ln);
 1174 }
 1175 
 1176 
 1177 int
 1178 nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp)
 1179 {
 1180         struct in6_drlist *drl = (struct in6_drlist *)data;
 1181         struct in6_oprlist *oprl = (struct in6_oprlist *)data;
 1182         struct in6_ndireq *ndi = (struct in6_ndireq *)data;
 1183         struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data;
 1184         struct in6_ndifreq *ndif = (struct in6_ndifreq *)data;
 1185         struct nd_defrouter *dr;
 1186         struct nd_prefix *pr;
 1187         int i = 0, error = 0;
 1188         int s;
 1189 
 1190         switch (cmd) {
 1191         case SIOCGDRLST_IN6:
 1192                 /*
 1193                  * obsolete API, use sysctl under net.inet6.icmp6
 1194                  */
 1195                 bzero(drl, sizeof(*drl));
 1196                 s = splnet();
 1197                 dr = TAILQ_FIRST(&V_nd_defrouter);
 1198                 while (dr && i < DRLSTSIZ) {
 1199                         drl->defrouter[i].rtaddr = dr->rtaddr;
 1200                         in6_clearscope(&drl->defrouter[i].rtaddr);
 1201 
 1202                         drl->defrouter[i].flags = dr->flags;
 1203                         drl->defrouter[i].rtlifetime = dr->rtlifetime;
 1204                         drl->defrouter[i].expire = dr->expire;
 1205                         drl->defrouter[i].if_index = dr->ifp->if_index;
 1206                         i++;
 1207                         dr = TAILQ_NEXT(dr, dr_entry);
 1208                 }
 1209                 splx(s);
 1210                 break;
 1211         case SIOCGPRLST_IN6:
 1212                 /*
 1213                  * obsolete API, use sysctl under net.inet6.icmp6
 1214                  *
 1215                  * XXX the structure in6_prlist was changed in backward-
 1216                  * incompatible manner.  in6_oprlist is used for SIOCGPRLST_IN6,
 1217                  * in6_prlist is used for nd6_sysctl() - fill_prlist().
 1218                  */
 1219                 /*
 1220                  * XXX meaning of fields, especialy "raflags", is very
 1221                  * differnet between RA prefix list and RR/static prefix list.
 1222                  * how about separating ioctls into two?
 1223                  */
 1224                 bzero(oprl, sizeof(*oprl));
 1225                 s = splnet();
 1226                 pr = V_nd_prefix.lh_first;
 1227                 while (pr && i < PRLSTSIZ) {
 1228                         struct nd_pfxrouter *pfr;
 1229                         int j;
 1230 
 1231                         oprl->prefix[i].prefix = pr->ndpr_prefix.sin6_addr;
 1232                         oprl->prefix[i].raflags = pr->ndpr_raf;
 1233                         oprl->prefix[i].prefixlen = pr->ndpr_plen;
 1234                         oprl->prefix[i].vltime = pr->ndpr_vltime;
 1235                         oprl->prefix[i].pltime = pr->ndpr_pltime;
 1236                         oprl->prefix[i].if_index = pr->ndpr_ifp->if_index;
 1237                         if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME)
 1238                                 oprl->prefix[i].expire = 0;
 1239                         else {
 1240                                 time_t maxexpire;
 1241 
 1242                                 /* XXX: we assume time_t is signed. */
 1243                                 maxexpire = (-1) &
 1244                                     ~((time_t)1 <<
 1245                                     ((sizeof(maxexpire) * 8) - 1));
 1246                                 if (pr->ndpr_vltime <
 1247                                     maxexpire - pr->ndpr_lastupdate) {
 1248                                         oprl->prefix[i].expire =
 1249                                             pr->ndpr_lastupdate +
 1250                                             pr->ndpr_vltime;
 1251                                 } else
 1252                                         oprl->prefix[i].expire = maxexpire;
 1253                         }
 1254 
 1255                         pfr = pr->ndpr_advrtrs.lh_first;
 1256                         j = 0;
 1257                         while (pfr) {
 1258                                 if (j < DRLSTSIZ) {
 1259 #define RTRADDR oprl->prefix[i].advrtr[j]
 1260                                         RTRADDR = pfr->router->rtaddr;
 1261                                         in6_clearscope(&RTRADDR);
 1262 #undef RTRADDR
 1263                                 }
 1264                                 j++;
 1265                                 pfr = pfr->pfr_next;
 1266                         }
 1267                         oprl->prefix[i].advrtrs = j;
 1268                         oprl->prefix[i].origin = PR_ORIG_RA;
 1269 
 1270                         i++;
 1271                         pr = pr->ndpr_next;
 1272                 }
 1273                 splx(s);
 1274 
 1275                 break;
 1276         case OSIOCGIFINFO_IN6:
 1277 #define ND      ndi->ndi
 1278                 /* XXX: old ndp(8) assumes a positive value for linkmtu. */
 1279                 bzero(&ND, sizeof(ND));
 1280                 ND.linkmtu = IN6_LINKMTU(ifp);
 1281                 ND.maxmtu = ND_IFINFO(ifp)->maxmtu;
 1282                 ND.basereachable = ND_IFINFO(ifp)->basereachable;
 1283                 ND.reachable = ND_IFINFO(ifp)->reachable;
 1284                 ND.retrans = ND_IFINFO(ifp)->retrans;
 1285                 ND.flags = ND_IFINFO(ifp)->flags;
 1286                 ND.recalctm = ND_IFINFO(ifp)->recalctm;
 1287                 ND.chlim = ND_IFINFO(ifp)->chlim;
 1288                 break;
 1289         case SIOCGIFINFO_IN6:
 1290                 ND = *ND_IFINFO(ifp);
 1291                 break;
 1292         case SIOCSIFINFO_IN6:
 1293                 /*
 1294                  * used to change host variables from userland.
 1295                  * intented for a use on router to reflect RA configurations.
 1296                  */
 1297                 /* 0 means 'unspecified' */
 1298                 if (ND.linkmtu != 0) {
 1299                         if (ND.linkmtu < IPV6_MMTU ||
 1300                             ND.linkmtu > IN6_LINKMTU(ifp)) {
 1301                                 error = EINVAL;
 1302                                 break;
 1303                         }
 1304                         ND_IFINFO(ifp)->linkmtu = ND.linkmtu;
 1305                 }
 1306 
 1307                 if (ND.basereachable != 0) {
 1308                         int obasereachable = ND_IFINFO(ifp)->basereachable;
 1309 
 1310                         ND_IFINFO(ifp)->basereachable = ND.basereachable;
 1311                         if (ND.basereachable != obasereachable)
 1312                                 ND_IFINFO(ifp)->reachable =
 1313                                     ND_COMPUTE_RTIME(ND.basereachable);
 1314                 }
 1315                 if (ND.retrans != 0)
 1316                         ND_IFINFO(ifp)->retrans = ND.retrans;
 1317                 if (ND.chlim != 0)
 1318                         ND_IFINFO(ifp)->chlim = ND.chlim;
 1319                 /* FALLTHROUGH */
 1320         case SIOCSIFINFO_FLAGS:
 1321         {
 1322                 struct ifaddr *ifa;
 1323                 struct in6_ifaddr *ia;
 1324 
 1325                 /*
 1326                  * Try to clear ifdisabled flag when enabling
 1327                  * accept_rtadv or auto_linklocal.
 1328                  */
 1329                 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
 1330                     !(ND.flags & ND6_IFF_IFDISABLED) &&
 1331                     (ND.flags & (ND6_IFF_ACCEPT_RTADV |
 1332                     ND6_IFF_AUTO_LINKLOCAL)))
 1333                         ND.flags &= ~ND6_IFF_IFDISABLED;
 1334 
 1335                 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
 1336                     !(ND.flags & ND6_IFF_IFDISABLED)) {
 1337                         /* ifdisabled 1->0 transision */
 1338 
 1339                         /*
 1340                          * If the interface is marked as ND6_IFF_IFDISABLED and
 1341                          * has an link-local address with IN6_IFF_DUPLICATED,
 1342                          * do not clear ND6_IFF_IFDISABLED.
 1343                          * See RFC 4862, Section 5.4.5.
 1344                          */
 1345                         int duplicated_linklocal = 0;
 1346 
 1347                         IF_ADDR_LOCK(ifp);
 1348                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1349                                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1350                                         continue;
 1351                                 ia = (struct in6_ifaddr *)ifa;
 1352                                 if ((ia->ia6_flags & IN6_IFF_DUPLICATED) &&
 1353                                     IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia))) {
 1354                                         duplicated_linklocal = 1;
 1355                                         break;
 1356                                 }
 1357                         }
 1358                         IF_ADDR_UNLOCK(ifp);
 1359 
 1360                         if (duplicated_linklocal) {
 1361                                 ND.flags |= ND6_IFF_IFDISABLED;
 1362                                 log(LOG_ERR, "Cannot enable an interface"
 1363                                     " with a link-local address marked"
 1364                                     " duplicate.\n");
 1365                         } else {
 1366                                 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IFDISABLED;
 1367                                 if (ifp->if_flags & IFF_UP)
 1368                                         in6_if_up(ifp);
 1369                         }
 1370                 } else if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
 1371                             (ND.flags & ND6_IFF_IFDISABLED)) {
 1372                         /* ifdisabled 0->1 transision */
 1373                         /* Mark all IPv6 address as tentative. */
 1374 
 1375                         ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
 1376                         IF_ADDR_LOCK(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                                 ia->ia6_flags |= IN6_IFF_TENTATIVE;
 1382                         }
 1383                         IF_ADDR_UNLOCK(ifp);
 1384                 }
 1385 
 1386                 if (ND.flags & ND6_IFF_AUTO_LINKLOCAL) {
 1387                         if (!(ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL)) {
 1388                                 /* auto_linklocal 0->1 transision */
 1389 
 1390                                 /* If no link-local address on ifp, configure */
 1391                                 ND_IFINFO(ifp)->flags |= ND6_IFF_AUTO_LINKLOCAL;
 1392                                 in6_ifattach(ifp, NULL);
 1393                         } else if (!(ND.flags & ND6_IFF_IFDISABLED) &&
 1394                             ifp->if_flags & IFF_UP) {
 1395                                 /*
 1396                                  * When the IF already has
 1397                                  * ND6_IFF_AUTO_LINKLOCAL, no link-local
 1398                                  * address is assigned, and IFF_UP, try to
 1399                                  * assign one.
 1400                                  */
 1401                                 int haslinklocal = 0;
 1402                         
 1403                                 IF_ADDR_LOCK(ifp);
 1404                                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1405                                         if (ifa->ifa_addr->sa_family != AF_INET6)
 1406                                                 continue;
 1407                                         ia = (struct in6_ifaddr *)ifa;
 1408                                         if (IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia))) {
 1409                                                 haslinklocal = 1;
 1410                                                 break;
 1411                                         }
 1412                                 }
 1413                                 IF_ADDR_UNLOCK(ifp);
 1414                                 if (!haslinklocal)
 1415                                         in6_ifattach(ifp, NULL);
 1416                         }
 1417                 }
 1418         }
 1419                 ND_IFINFO(ifp)->flags = ND.flags;
 1420                 break;
 1421 #undef ND
 1422         case SIOCSNDFLUSH_IN6:  /* XXX: the ioctl name is confusing... */
 1423                 /* sync kernel routing table with the default router list */
 1424                 defrouter_reset();
 1425                 defrouter_select();
 1426                 break;
 1427         case SIOCSPFXFLUSH_IN6:
 1428         {
 1429                 /* flush all the prefix advertised by routers */
 1430                 struct nd_prefix *pr, *next;
 1431 
 1432                 s = splnet();
 1433                 for (pr = V_nd_prefix.lh_first; pr; pr = next) {
 1434                         struct in6_ifaddr *ia, *ia_next;
 1435 
 1436                         next = pr->ndpr_next;
 1437 
 1438                         if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
 1439                                 continue; /* XXX */
 1440 
 1441                         /* do we really have to remove addresses as well? */
 1442                         /* XXXRW: in6_ifaddrhead locking. */
 1443                         TAILQ_FOREACH_SAFE(ia, &V_in6_ifaddrhead, ia_link,
 1444                             ia_next) {
 1445                                 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0)
 1446                                         continue;
 1447 
 1448                                 if (ia->ia6_ndpr == pr)
 1449                                         in6_purgeaddr(&ia->ia_ifa);
 1450                         }
 1451                         prelist_remove(pr);
 1452                 }
 1453                 splx(s);
 1454                 break;
 1455         }
 1456         case SIOCSRTRFLUSH_IN6:
 1457         {
 1458                 /* flush all the default routers */
 1459                 struct nd_defrouter *dr, *next;
 1460 
 1461                 s = splnet();
 1462                 defrouter_reset();
 1463                 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr; dr = next) {
 1464                         next = TAILQ_NEXT(dr, dr_entry);
 1465                         defrtrlist_del(dr);
 1466                 }
 1467                 defrouter_select();
 1468                 splx(s);
 1469                 break;
 1470         }
 1471         case SIOCGNBRINFO_IN6:
 1472         {
 1473                 struct llentry *ln;
 1474                 struct in6_addr nb_addr = nbi->addr; /* make local for safety */
 1475 
 1476                 if ((error = in6_setscope(&nb_addr, ifp, NULL)) != 0)
 1477                         return (error);
 1478 
 1479                 IF_AFDATA_LOCK(ifp);
 1480                 ln = nd6_lookup(&nb_addr, 0, ifp);
 1481                 IF_AFDATA_UNLOCK(ifp);
 1482 
 1483                 if (ln == NULL) {
 1484                         error = EINVAL;
 1485                         break;
 1486                 }
 1487                 nbi->state = ln->ln_state;
 1488                 nbi->asked = ln->la_asked;
 1489                 nbi->isrouter = ln->ln_router;
 1490                 nbi->expire = ln->la_expire;
 1491                 LLE_RUNLOCK(ln);
 1492                 break;
 1493         }
 1494         case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
 1495                 ndif->ifindex = V_nd6_defifindex;
 1496                 break;
 1497         case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
 1498                 return (nd6_setdefaultiface(ndif->ifindex));
 1499         }
 1500         return (error);
 1501 }
 1502 
 1503 /*
 1504  * Create neighbor cache entry and cache link-layer address,
 1505  * on reception of inbound ND6 packets.  (RS/RA/NS/redirect)
 1506  *
 1507  * type - ICMP6 type
 1508  * code - type dependent information
 1509  *
 1510  * XXXXX
 1511  *  The caller of this function already acquired the ndp 
 1512  *  cache table lock because the cache entry is returned.
 1513  */
 1514 struct llentry *
 1515 nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr,
 1516     int lladdrlen, int type, int code)
 1517 {
 1518         struct llentry *ln = NULL;
 1519         int is_newentry;
 1520         int do_update;
 1521         int olladdr;
 1522         int llchange;
 1523         int flags;
 1524         int newstate = 0;
 1525         uint16_t router = 0;
 1526         struct sockaddr_in6 sin6;
 1527         struct mbuf *chain = NULL;
 1528         int static_route = 0;
 1529 
 1530         IF_AFDATA_UNLOCK_ASSERT(ifp);
 1531 
 1532         if (ifp == NULL)
 1533                 panic("ifp == NULL in nd6_cache_lladdr");
 1534         if (from == NULL)
 1535                 panic("from == NULL in nd6_cache_lladdr");
 1536 
 1537         /* nothing must be updated for unspecified address */
 1538         if (IN6_IS_ADDR_UNSPECIFIED(from))
 1539                 return NULL;
 1540 
 1541         /*
 1542          * Validation about ifp->if_addrlen and lladdrlen must be done in
 1543          * the caller.
 1544          *
 1545          * XXX If the link does not have link-layer adderss, what should
 1546          * we do? (ifp->if_addrlen == 0)
 1547          * Spec says nothing in sections for RA, RS and NA.  There's small
 1548          * description on it in NS section (RFC 2461 7.2.3).
 1549          */
 1550         flags = lladdr ? ND6_EXCLUSIVE : 0;
 1551         IF_AFDATA_LOCK(ifp);
 1552         ln = nd6_lookup(from, flags, ifp);
 1553 
 1554         if (ln == NULL) {
 1555                 flags |= ND6_EXCLUSIVE;
 1556                 ln = nd6_lookup(from, flags | ND6_CREATE, ifp);
 1557                 IF_AFDATA_UNLOCK(ifp);
 1558                 is_newentry = 1;
 1559         } else {
 1560                 IF_AFDATA_UNLOCK(ifp);          
 1561                 /* do nothing if static ndp is set */
 1562                 if (ln->la_flags & LLE_STATIC) {
 1563                         static_route = 1;
 1564                         goto done;
 1565                 }
 1566                 is_newentry = 0;
 1567         }
 1568         if (ln == NULL)
 1569                 return (NULL);
 1570 
 1571         olladdr = (ln->la_flags & LLE_VALID) ? 1 : 0;
 1572         if (olladdr && lladdr) {
 1573                 llchange = bcmp(lladdr, &ln->ll_addr,
 1574                     ifp->if_addrlen);
 1575         } else
 1576                 llchange = 0;
 1577 
 1578         /*
 1579          * newentry olladdr  lladdr  llchange   (*=record)
 1580          *      0       n       n       --      (1)
 1581          *      0       y       n       --      (2)
 1582          *      0       n       y       --      (3) * STALE
 1583          *      0       y       y       n       (4) *
 1584          *      0       y       y       y       (5) * STALE
 1585          *      1       --      n       --      (6)   NOSTATE(= PASSIVE)
 1586          *      1       --      y       --      (7) * STALE
 1587          */
 1588 
 1589         if (lladdr) {           /* (3-5) and (7) */
 1590                 /*
 1591                  * Record source link-layer address
 1592                  * XXX is it dependent to ifp->if_type?
 1593                  */
 1594                 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
 1595                 ln->la_flags |= LLE_VALID;
 1596         }
 1597 
 1598         if (!is_newentry) {
 1599                 if ((!olladdr && lladdr != NULL) ||     /* (3) */
 1600                     (olladdr && lladdr != NULL && llchange)) {  /* (5) */
 1601                         do_update = 1;
 1602                         newstate = ND6_LLINFO_STALE;
 1603                 } else                                  /* (1-2,4) */
 1604                         do_update = 0;
 1605         } else {
 1606                 do_update = 1;
 1607                 if (lladdr == NULL)                     /* (6) */
 1608                         newstate = ND6_LLINFO_NOSTATE;
 1609                 else                                    /* (7) */
 1610                         newstate = ND6_LLINFO_STALE;
 1611         }
 1612 
 1613         if (do_update) {
 1614                 /*
 1615                  * Update the state of the neighbor cache.
 1616                  */
 1617                 ln->ln_state = newstate;
 1618 
 1619                 if (ln->ln_state == ND6_LLINFO_STALE) {
 1620                         /*
 1621                          * XXX: since nd6_output() below will cause
 1622                          * state tansition to DELAY and reset the timer,
 1623                          * we must set the timer now, although it is actually
 1624                          * meaningless.
 1625                          */
 1626                         nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
 1627 
 1628                         if (ln->la_hold) {
 1629                                 struct mbuf *m_hold, *m_hold_next;
 1630 
 1631                                 /*
 1632                                  * reset the la_hold in advance, to explicitly
 1633                                  * prevent a la_hold lookup in nd6_output()
 1634                                  * (wouldn't happen, though...)
 1635                                  */
 1636                                 for (m_hold = ln->la_hold, ln->la_hold = NULL;
 1637                                     m_hold; m_hold = m_hold_next) {
 1638                                         m_hold_next = m_hold->m_nextpkt;
 1639                                         m_hold->m_nextpkt = NULL;
 1640 
 1641                                         /*
 1642                                          * we assume ifp is not a p2p here, so
 1643                                          * just set the 2nd argument as the
 1644                                          * 1st one.
 1645                                          */
 1646                                         nd6_output_lle(ifp, ifp, m_hold, L3_ADDR_SIN6(ln), NULL, ln, &chain);
 1647                                 }
 1648                                 /*
 1649                                  * If we have mbufs in the chain we need to do
 1650                                  * deferred transmit. Copy the address from the
 1651                                  * llentry before dropping the lock down below.
 1652                                  */
 1653                                 if (chain != NULL)
 1654                                         memcpy(&sin6, L3_ADDR_SIN6(ln), sizeof(sin6));
 1655                         }
 1656                 } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
 1657                         /* probe right away */
 1658                         nd6_llinfo_settimer_locked((void *)ln, 0);
 1659                 }
 1660         }
 1661 
 1662         /*
 1663          * ICMP6 type dependent behavior.
 1664          *
 1665          * NS: clear IsRouter if new entry
 1666          * RS: clear IsRouter
 1667          * RA: set IsRouter if there's lladdr
 1668          * redir: clear IsRouter if new entry
 1669          *
 1670          * RA case, (1):
 1671          * The spec says that we must set IsRouter in the following cases:
 1672          * - If lladdr exist, set IsRouter.  This means (1-5).
 1673          * - If it is old entry (!newentry), set IsRouter.  This means (7).
 1674          * So, based on the spec, in (1-5) and (7) cases we must set IsRouter.
 1675          * A quetion arises for (1) case.  (1) case has no lladdr in the
 1676          * neighbor cache, this is similar to (6).
 1677          * This case is rare but we figured that we MUST NOT set IsRouter.
 1678          *
 1679          * newentry olladdr  lladdr  llchange       NS  RS  RA  redir
 1680          *                                                      D R
 1681          *      0       n       n       --      (1)     c   ?     s
 1682          *      0       y       n       --      (2)     c   s     s
 1683          *      0       n       y       --      (3)     c   s     s
 1684          *      0       y       y       n       (4)     c   s     s
 1685          *      0       y       y       y       (5)     c   s     s
 1686          *      1       --      n       --      (6) c   c       c s
 1687          *      1       --      y       --      (7) c   c   s   c s
 1688          *
 1689          *                                      (c=clear s=set)
 1690          */
 1691         switch (type & 0xff) {
 1692         case ND_NEIGHBOR_SOLICIT:
 1693                 /*
 1694                  * New entry must have is_router flag cleared.
 1695                  */
 1696                 if (is_newentry)        /* (6-7) */
 1697                         ln->ln_router = 0;
 1698                 break;
 1699         case ND_REDIRECT:
 1700                 /*
 1701                  * If the icmp is a redirect to a better router, always set the
 1702                  * is_router flag.  Otherwise, if the entry is newly created,
 1703                  * clear the flag.  [RFC 2461, sec 8.3]
 1704                  */
 1705                 if (code == ND_REDIRECT_ROUTER)
 1706                         ln->ln_router = 1;
 1707                 else if (is_newentry) /* (6-7) */
 1708                         ln->ln_router = 0;
 1709                 break;
 1710         case ND_ROUTER_SOLICIT:
 1711                 /*
 1712                  * is_router flag must always be cleared.
 1713                  */
 1714                 ln->ln_router = 0;
 1715                 break;
 1716         case ND_ROUTER_ADVERT:
 1717                 /*
 1718                  * Mark an entry with lladdr as a router.
 1719                  */
 1720                 if ((!is_newentry && (olladdr || lladdr)) ||    /* (2-5) */
 1721                     (is_newentry && lladdr)) {                  /* (7) */
 1722                         ln->ln_router = 1;
 1723                 }
 1724                 break;
 1725         }
 1726 
 1727         if (ln != NULL) {
 1728                 static_route = (ln->la_flags & LLE_STATIC);
 1729                 router = ln->ln_router;
 1730 
 1731                 if (flags & ND6_EXCLUSIVE)
 1732                         LLE_WUNLOCK(ln);
 1733                 else
 1734                         LLE_RUNLOCK(ln);
 1735                 if (static_route)
 1736                         ln = NULL;
 1737         }
 1738         if (chain)
 1739                 nd6_output_flush(ifp, ifp, chain, &sin6, NULL);
 1740         
 1741         /*
 1742          * When the link-layer address of a router changes, select the
 1743          * best router again.  In particular, when the neighbor entry is newly
 1744          * created, it might affect the selection policy.
 1745          * Question: can we restrict the first condition to the "is_newentry"
 1746          * case?
 1747          * XXX: when we hear an RA from a new router with the link-layer
 1748          * address option, defrouter_select() is called twice, since
 1749          * defrtrlist_update called the function as well.  However, I believe
 1750          * we can compromise the overhead, since it only happens the first
 1751          * time.
 1752          * XXX: although defrouter_select() should not have a bad effect
 1753          * for those are not autoconfigured hosts, we explicitly avoid such
 1754          * cases for safety.
 1755          */
 1756         if (do_update && router &&
 1757             ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
 1758                 /*
 1759                  * guaranteed recursion
 1760                  */
 1761                 defrouter_select();
 1762         }
 1763         
 1764         return (ln);
 1765 done:   
 1766         if (ln != NULL) {
 1767                 if (flags & ND6_EXCLUSIVE)
 1768                         LLE_WUNLOCK(ln);
 1769                 else
 1770                         LLE_RUNLOCK(ln);
 1771                 if (static_route)
 1772                         ln = NULL;
 1773         }
 1774         return (ln);
 1775 }
 1776 
 1777 static void
 1778 nd6_slowtimo(void *arg)
 1779 {
 1780         CURVNET_SET((struct vnet *) arg);
 1781         struct nd_ifinfo *nd6if;
 1782         struct ifnet *ifp;
 1783 
 1784         callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
 1785             nd6_slowtimo, curvnet);
 1786         IFNET_RLOCK_NOSLEEP();
 1787         for (ifp = TAILQ_FIRST(&V_ifnet); ifp;
 1788             ifp = TAILQ_NEXT(ifp, if_list)) {
 1789                 nd6if = ND_IFINFO(ifp);
 1790                 if (nd6if->basereachable && /* already initialized */
 1791                     (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) {
 1792                         /*
 1793                          * Since reachable time rarely changes by router
 1794                          * advertisements, we SHOULD insure that a new random
 1795                          * value gets recomputed at least once every few hours.
 1796                          * (RFC 2461, 6.3.4)
 1797                          */
 1798                         nd6if->recalctm = V_nd6_recalc_reachtm_interval;
 1799                         nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable);
 1800                 }
 1801         }
 1802         IFNET_RUNLOCK_NOSLEEP();
 1803         CURVNET_RESTORE();
 1804 }
 1805 
 1806 int
 1807 nd6_output(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m0,
 1808     struct sockaddr_in6 *dst, struct rtentry *rt0)
 1809 {
 1810 
 1811         return (nd6_output_lle(ifp, origifp, m0, dst, rt0, NULL, NULL));
 1812 }
 1813 
 1814 
 1815 /*
 1816  * Note that I'm not enforcing any global serialization
 1817  * lle state or asked changes here as the logic is too
 1818  * complicated to avoid having to always acquire an exclusive
 1819  * lock
 1820  * KMM
 1821  *
 1822  */
 1823 #define senderr(e) { error = (e); goto bad;}
 1824 
 1825 int
 1826 nd6_output_lle(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m0,
 1827     struct sockaddr_in6 *dst, struct rtentry *rt0, struct llentry *lle,
 1828         struct mbuf **chain)
 1829 {
 1830         struct mbuf *m = m0;
 1831         struct m_tag *mtag;
 1832         struct llentry *ln = lle;
 1833         struct ip6_hdr *ip6;
 1834         int error = 0;
 1835         int flags = 0;
 1836         int ip6len;
 1837 
 1838 #ifdef INVARIANTS
 1839         if (lle != NULL) {
 1840                 
 1841                 LLE_WLOCK_ASSERT(lle);
 1842 
 1843                 KASSERT(chain != NULL, (" lle locked but no mbuf chain pointer passed"));
 1844         }
 1845 #endif
 1846         if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr))
 1847                 goto sendpkt;
 1848 
 1849         if (nd6_need_cache(ifp) == 0)
 1850                 goto sendpkt;
 1851 
 1852         /*
 1853          * next hop determination.  This routine is derived from ether_output.
 1854          */
 1855 
 1856         /*
 1857          * Address resolution or Neighbor Unreachability Detection
 1858          * for the next hop.
 1859          * At this point, the destination of the packet must be a unicast
 1860          * or an anycast address(i.e. not a multicast).
 1861          */
 1862 
 1863         flags = ((m != NULL) || (lle != NULL)) ? LLE_EXCLUSIVE : 0;
 1864         if (ln == NULL) {
 1865         retry:
 1866                 IF_AFDATA_LOCK(ifp);
 1867                 ln = lla_lookup(LLTABLE6(ifp), flags, (struct sockaddr *)dst);
 1868                 IF_AFDATA_UNLOCK(ifp);
 1869                 if ((ln == NULL) && nd6_is_addr_neighbor(dst, ifp))  {
 1870                         /*
 1871                          * Since nd6_is_addr_neighbor() internally calls nd6_lookup(),
 1872                          * the condition below is not very efficient.  But we believe
 1873                          * it is tolerable, because this should be a rare case.
 1874                          */
 1875                         flags = ND6_CREATE | (m ? ND6_EXCLUSIVE : 0);
 1876                         IF_AFDATA_LOCK(ifp);
 1877                         ln = nd6_lookup(&dst->sin6_addr, flags, ifp);
 1878                         IF_AFDATA_UNLOCK(ifp);
 1879                 }
 1880         } 
 1881         if (ln == NULL) {
 1882                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0 &&
 1883                     !(ND_IFINFO(ifp)->flags & ND6_IFF_PERFORMNUD)) {
 1884                         char ip6buf[INET6_ADDRSTRLEN];
 1885                         log(LOG_DEBUG,
 1886                             "nd6_output: can't allocate llinfo for %s "
 1887                             "(ln=%p)\n",
 1888                             ip6_sprintf(ip6buf, &dst->sin6_addr), ln);
 1889                         senderr(EIO);   /* XXX: good error? */
 1890                 }
 1891                 goto sendpkt;   /* send anyway */
 1892         }
 1893 
 1894         /* We don't have to do link-layer address resolution on a p2p link. */
 1895         if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
 1896             ln->ln_state < ND6_LLINFO_REACHABLE) {
 1897                 if ((flags & LLE_EXCLUSIVE) == 0) {
 1898                         flags |= LLE_EXCLUSIVE;
 1899                         goto retry;
 1900                 }
 1901                 ln->ln_state = ND6_LLINFO_STALE;
 1902                 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
 1903         }
 1904 
 1905         /*
 1906          * The first time we send a packet to a neighbor whose entry is
 1907          * STALE, we have to change the state to DELAY and a sets a timer to
 1908          * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do
 1909          * neighbor unreachability detection on expiration.
 1910          * (RFC 2461 7.3.3)
 1911          */
 1912         if (ln->ln_state == ND6_LLINFO_STALE) {
 1913                 if ((flags & LLE_EXCLUSIVE) == 0) {
 1914                         flags |= LLE_EXCLUSIVE;
 1915                         LLE_RUNLOCK(ln);
 1916                         goto retry;
 1917                 }
 1918                 ln->la_asked = 0;
 1919                 ln->ln_state = ND6_LLINFO_DELAY;
 1920                 nd6_llinfo_settimer_locked(ln, (long)V_nd6_delay * hz);
 1921         }
 1922 
 1923         /*
 1924          * If the neighbor cache entry has a state other than INCOMPLETE
 1925          * (i.e. its link-layer address is already resolved), just
 1926          * send the packet.
 1927          */
 1928         if (ln->ln_state > ND6_LLINFO_INCOMPLETE)
 1929                 goto sendpkt;
 1930 
 1931         /*
 1932          * There is a neighbor cache entry, but no ethernet address
 1933          * response yet.  Append this latest packet to the end of the
 1934          * packet queue in the mbuf, unless the number of the packet
 1935          * does not exceed nd6_maxqueuelen.  When it exceeds nd6_maxqueuelen,
 1936          * the oldest packet in the queue will be removed.
 1937          */
 1938         if (ln->ln_state == ND6_LLINFO_NOSTATE)
 1939                 ln->ln_state = ND6_LLINFO_INCOMPLETE;
 1940 
 1941         if ((flags & LLE_EXCLUSIVE) == 0) {
 1942                 flags |= LLE_EXCLUSIVE;
 1943                 LLE_RUNLOCK(ln);
 1944                 goto retry;
 1945         }
 1946 
 1947         LLE_WLOCK_ASSERT(ln);
 1948 
 1949         if (ln->la_hold) {
 1950                 struct mbuf *m_hold;
 1951                 int i;
 1952                 
 1953                 i = 0;
 1954                 for (m_hold = ln->la_hold; m_hold; m_hold = m_hold->m_nextpkt) {
 1955                         i++;
 1956                         if (m_hold->m_nextpkt == NULL) {
 1957                                 m_hold->m_nextpkt = m;
 1958                                 break;
 1959                         }
 1960                 }
 1961                 while (i >= V_nd6_maxqueuelen) {
 1962                         m_hold = ln->la_hold;
 1963                         ln->la_hold = ln->la_hold->m_nextpkt;
 1964                         m_freem(m_hold);
 1965                         i--;
 1966                 }
 1967         } else {
 1968                 ln->la_hold = m;
 1969         }
 1970 
 1971         /*
 1972          * If there has been no NS for the neighbor after entering the
 1973          * INCOMPLETE state, send the first solicitation.
 1974          */
 1975         if (!ND6_LLINFO_PERMANENT(ln) && ln->la_asked == 0) {
 1976                 ln->la_asked++;
 1977                 
 1978                 nd6_llinfo_settimer_locked(ln,
 1979                     (long)ND_IFINFO(ifp)->retrans * hz / 1000);
 1980                 LLE_WUNLOCK(ln);
 1981                 nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0);
 1982                 if (lle != NULL && ln == lle)
 1983                         LLE_WLOCK(lle);
 1984 
 1985         } else if (lle == NULL || ln != lle) {
 1986                 /*
 1987                  * We did the lookup (no lle arg) so we
 1988                  * need to do the unlock here.
 1989                  */
 1990                 LLE_WUNLOCK(ln);
 1991         }
 1992 
 1993         return (0);
 1994 
 1995   sendpkt:
 1996         /* discard the packet if IPv6 operation is disabled on the interface */
 1997         if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) {
 1998                 error = ENETDOWN; /* better error? */
 1999                 goto bad;
 2000         }
 2001         /*
 2002          * ln is valid and the caller did not pass in 
 2003          * an llentry
 2004          */
 2005         if ((ln != NULL) && (lle == NULL)) {
 2006                 if (flags & LLE_EXCLUSIVE)
 2007                         LLE_WUNLOCK(ln);
 2008                 else
 2009                         LLE_RUNLOCK(ln);
 2010         }
 2011 
 2012 #ifdef MAC
 2013         mac_netinet6_nd6_send(ifp, m);
 2014 #endif
 2015 
 2016         /*
 2017          * If called from nd6_ns_output() (NS), nd6_na_output() (NA),
 2018          * icmp6_redirect_output() (REDIRECT) or from rip6_output() (RS, RA
 2019          * as handled by rtsol and rtadvd), mbufs will be tagged for SeND
 2020          * to be diverted to user space.  When re-injected into the kernel,
 2021          * send_output() will directly dispatch them to the outgoing interface.
 2022          */
 2023         if (send_sendso_input_hook != NULL) {
 2024                 mtag = m_tag_find(m, PACKET_TAG_ND_OUTGOING, NULL);
 2025                 if (mtag != NULL) {
 2026                         ip6 = mtod(m, struct ip6_hdr *);
 2027                         ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
 2028                         /* Use the SEND socket */
 2029                         error = send_sendso_input_hook(m, ifp, SND_OUT,
 2030                             ip6len);
 2031                         /* -1 == no app on SEND socket */
 2032                         if (error == 0 || error != -1)
 2033                             return (error);
 2034                 }
 2035         }
 2036 
 2037         /*
 2038          * We were passed in a pointer to an lle with the lock held 
 2039          * this means that we can't call if_output as we will
 2040          * recurse on the lle lock - so what we do is we create
 2041          * a list of mbufs to send and transmit them in the caller
 2042          * after the lock is dropped
 2043          */
 2044         if (lle != NULL) {
 2045                 if (*chain == NULL)
 2046                         *chain = m;
 2047                 else {
 2048                         struct mbuf *mb;
 2049 
 2050                         /*
 2051                          * append mbuf to end of deferred chain
 2052                          */
 2053                         mb = *chain;
 2054                         while (mb->m_nextpkt != NULL)
 2055                                 mb = mb->m_nextpkt;
 2056                         mb->m_nextpkt = m;
 2057                 }
 2058                 return (error);
 2059         }
 2060         if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
 2061                 return ((*ifp->if_output)(origifp, m, (struct sockaddr *)dst,
 2062                     NULL));
 2063         }
 2064         error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, NULL);
 2065         return (error);
 2066 
 2067   bad:
 2068         /*
 2069          * ln is valid and the caller did not pass in 
 2070          * an llentry
 2071          */
 2072         if ((ln != NULL) && (lle == NULL)) {
 2073                 if (flags & LLE_EXCLUSIVE)
 2074                         LLE_WUNLOCK(ln);
 2075                 else
 2076                         LLE_RUNLOCK(ln);
 2077         }
 2078         if (m)
 2079                 m_freem(m);
 2080         return (error);
 2081 }
 2082 #undef senderr
 2083 
 2084 
 2085 int
 2086 nd6_output_flush(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *chain,
 2087     struct sockaddr_in6 *dst, struct route *ro)
 2088 {
 2089         struct mbuf *m, *m_head;
 2090         struct ifnet *outifp;
 2091         int error = 0;
 2092 
 2093         m_head = chain;
 2094         if ((ifp->if_flags & IFF_LOOPBACK) != 0)
 2095                 outifp = origifp;
 2096         else
 2097                 outifp = ifp;
 2098         
 2099         while (m_head) {
 2100                 m = m_head;
 2101                 m_head = m_head->m_nextpkt;
 2102                 error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, ro);                         
 2103         }
 2104 
 2105         /*
 2106          * XXX
 2107          * note that intermediate errors are blindly ignored - but this is 
 2108          * the same convention as used with nd6_output when called by
 2109          * nd6_cache_lladdr
 2110          */
 2111         return (error);
 2112 }       
 2113 
 2114 
 2115 int
 2116 nd6_need_cache(struct ifnet *ifp)
 2117 {
 2118         /*
 2119          * XXX: we currently do not make neighbor cache on any interface
 2120          * other than ARCnet, Ethernet, FDDI and GIF.
 2121          *
 2122          * RFC2893 says:
 2123          * - unidirectional tunnels needs no ND
 2124          */
 2125         switch (ifp->if_type) {
 2126         case IFT_ARCNET:
 2127         case IFT_ETHER:
 2128         case IFT_FDDI:
 2129         case IFT_IEEE1394:
 2130 #ifdef IFT_L2VLAN
 2131         case IFT_L2VLAN:
 2132 #endif
 2133 #ifdef IFT_IEEE80211
 2134         case IFT_IEEE80211:
 2135 #endif
 2136 #ifdef IFT_CARP
 2137         case IFT_CARP:
 2138 #endif
 2139         case IFT_INFINIBAND:
 2140         case IFT_GIF:           /* XXX need more cases? */
 2141         case IFT_PPP:
 2142         case IFT_TUNNEL:
 2143         case IFT_BRIDGE:
 2144         case IFT_PROPVIRTUAL:
 2145                 return (1);
 2146         default:
 2147                 return (0);
 2148         }
 2149 }
 2150 
 2151 /*
 2152  * the callers of this function need to be re-worked to drop
 2153  * the lle lock, drop here for now
 2154  */
 2155 int
 2156 nd6_storelladdr(struct ifnet *ifp, struct mbuf *m,
 2157     struct sockaddr *dst, u_char *desten, struct llentry **lle)
 2158 {
 2159         struct llentry *ln;
 2160 
 2161         *lle = NULL;
 2162         IF_AFDATA_UNLOCK_ASSERT(ifp);
 2163         if (m->m_flags & M_MCAST) {
 2164                 int i;
 2165 
 2166                 switch (ifp->if_type) {
 2167                 case IFT_ETHER:
 2168                 case IFT_FDDI:
 2169 #ifdef IFT_L2VLAN
 2170                 case IFT_L2VLAN:
 2171 #endif
 2172 #ifdef IFT_IEEE80211
 2173                 case IFT_IEEE80211:
 2174 #endif
 2175                 case IFT_BRIDGE:
 2176                 case IFT_ISO88025:
 2177                         ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr,
 2178                                                  desten);
 2179                         return (0);
 2180                 case IFT_IEEE1394:
 2181                         /*
 2182                          * netbsd can use if_broadcastaddr, but we don't do so
 2183                          * to reduce # of ifdef.
 2184                          */
 2185                         for (i = 0; i < ifp->if_addrlen; i++)
 2186                                 desten[i] = ~0;
 2187                         return (0);
 2188                 case IFT_ARCNET:
 2189                         *desten = 0;
 2190                         return (0);
 2191                 default:
 2192                         m_freem(m);
 2193                         return (EAFNOSUPPORT);
 2194                 }
 2195         }
 2196 
 2197 
 2198         /*
 2199          * the entry should have been created in nd6_store_lladdr
 2200          */
 2201         IF_AFDATA_LOCK(ifp);
 2202         ln = lla_lookup(LLTABLE6(ifp), 0, dst);
 2203         IF_AFDATA_UNLOCK(ifp);
 2204         if ((ln == NULL) || !(ln->la_flags & LLE_VALID)) {
 2205                 if (ln != NULL)
 2206                         LLE_RUNLOCK(ln);
 2207                 /* this could happen, if we could not allocate memory */
 2208                 m_freem(m);
 2209                 return (1);
 2210         }
 2211 
 2212         bcopy(&ln->ll_addr, desten, ifp->if_addrlen);
 2213         *lle = ln;
 2214         LLE_RUNLOCK(ln);
 2215         /*
 2216          * A *small* use after free race exists here
 2217          */
 2218         return (0);
 2219 }
 2220 
 2221 static void 
 2222 clear_llinfo_pqueue(struct llentry *ln)
 2223 {
 2224         struct mbuf *m_hold, *m_hold_next;
 2225 
 2226         for (m_hold = ln->la_hold; m_hold; m_hold = m_hold_next) {
 2227                 m_hold_next = m_hold->m_nextpkt;
 2228                 m_hold->m_nextpkt = NULL;
 2229                 m_freem(m_hold);
 2230         }
 2231 
 2232         ln->la_hold = NULL;
 2233         return;
 2234 }
 2235 
 2236 static int nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS);
 2237 static int nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS);
 2238 #ifdef SYSCTL_DECL
 2239 SYSCTL_DECL(_net_inet6_icmp6);
 2240 #endif
 2241 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
 2242         CTLFLAG_RD, nd6_sysctl_drlist, "");
 2243 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist,
 2244         CTLFLAG_RD, nd6_sysctl_prlist, "");
 2245 SYSCTL_VNET_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXQLEN, nd6_maxqueuelen,
 2246         CTLFLAG_RW, &VNET_NAME(nd6_maxqueuelen), 1, "");
 2247 
 2248 static int
 2249 nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)
 2250 {
 2251         int error;
 2252         char buf[1024] __aligned(4);
 2253         struct in6_defrouter *d, *de;
 2254         struct nd_defrouter *dr;
 2255 
 2256         if (req->newptr)
 2257                 return EPERM;
 2258         error = 0;
 2259 
 2260         for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
 2261              dr = TAILQ_NEXT(dr, dr_entry)) {
 2262                 d = (struct in6_defrouter *)buf;
 2263                 de = (struct in6_defrouter *)(buf + sizeof(buf));
 2264 
 2265                 if (d + 1 <= de) {
 2266                         bzero(d, sizeof(*d));
 2267                         d->rtaddr.sin6_family = AF_INET6;
 2268                         d->rtaddr.sin6_len = sizeof(d->rtaddr);
 2269                         d->rtaddr.sin6_addr = dr->rtaddr;
 2270                         error = sa6_recoverscope(&d->rtaddr);
 2271                         if (error != 0)
 2272                                 return (error);
 2273                         d->flags = dr->flags;
 2274                         d->rtlifetime = dr->rtlifetime;
 2275                         d->expire = dr->expire;
 2276                         d->if_index = dr->ifp->if_index;
 2277                 } else
 2278                         panic("buffer too short");
 2279 
 2280                 error = SYSCTL_OUT(req, buf, sizeof(*d));
 2281                 if (error)
 2282                         break;
 2283         }
 2284 
 2285         return (error);
 2286 }
 2287 
 2288 static int
 2289 nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS)
 2290 {
 2291         int error;
 2292         char buf[1024] __aligned(4);
 2293         struct in6_prefix *p, *pe;
 2294         struct nd_prefix *pr;
 2295         char ip6buf[INET6_ADDRSTRLEN];
 2296 
 2297         if (req->newptr)
 2298                 return EPERM;
 2299         error = 0;
 2300 
 2301         for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
 2302                 u_short advrtrs;
 2303                 size_t advance;
 2304                 struct sockaddr_in6 *sin6, *s6;
 2305                 struct nd_pfxrouter *pfr;
 2306 
 2307                 p = (struct in6_prefix *)buf;
 2308                 pe = (struct in6_prefix *)(buf + sizeof(buf));
 2309 
 2310                 if (p + 1 <= pe) {
 2311                         bzero(p, sizeof(*p));
 2312                         sin6 = (struct sockaddr_in6 *)(p + 1);
 2313 
 2314                         p->prefix = pr->ndpr_prefix;
 2315                         if (sa6_recoverscope(&p->prefix)) {
 2316                                 log(LOG_ERR,
 2317                                     "scope error in prefix list (%s)\n",
 2318                                     ip6_sprintf(ip6buf, &p->prefix.sin6_addr));
 2319                                 /* XXX: press on... */
 2320                         }
 2321                         p->raflags = pr->ndpr_raf;
 2322                         p->prefixlen = pr->ndpr_plen;
 2323                         p->vltime = pr->ndpr_vltime;
 2324                         p->pltime = pr->ndpr_pltime;
 2325                         p->if_index = pr->ndpr_ifp->if_index;
 2326                         if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME)
 2327                                 p->expire = 0;
 2328                         else {
 2329                                 time_t maxexpire;
 2330 
 2331                                 /* XXX: we assume time_t is signed. */
 2332                                 maxexpire = (-1) &
 2333                                     ~((time_t)1 <<
 2334                                     ((sizeof(maxexpire) * 8) - 1));
 2335                                 if (pr->ndpr_vltime <
 2336                                     maxexpire - pr->ndpr_lastupdate) {
 2337                                     p->expire = pr->ndpr_lastupdate +
 2338                                         pr->ndpr_vltime;
 2339                                 } else
 2340                                         p->expire = maxexpire;
 2341                         }
 2342                         p->refcnt = pr->ndpr_refcnt;
 2343                         p->flags = pr->ndpr_stateflags;
 2344                         p->origin = PR_ORIG_RA;
 2345                         advrtrs = 0;
 2346                         for (pfr = pr->ndpr_advrtrs.lh_first; pfr;
 2347                              pfr = pfr->pfr_next) {
 2348                                 if ((void *)&sin6[advrtrs + 1] > (void *)pe) {
 2349                                         advrtrs++;
 2350                                         continue;
 2351                                 }
 2352                                 s6 = &sin6[advrtrs];
 2353                                 bzero(s6, sizeof(*s6));
 2354                                 s6->sin6_family = AF_INET6;
 2355                                 s6->sin6_len = sizeof(*sin6);
 2356                                 s6->sin6_addr = pfr->router->rtaddr;
 2357                                 if (sa6_recoverscope(s6)) {
 2358                                         log(LOG_ERR,
 2359                                             "scope error in "
 2360                                             "prefix list (%s)\n",
 2361                                             ip6_sprintf(ip6buf,
 2362                                                     &pfr->router->rtaddr));
 2363                                 }
 2364                                 advrtrs++;
 2365                         }
 2366                         p->advrtrs = advrtrs;
 2367                 } else
 2368                         panic("buffer too short");
 2369 
 2370                 advance = sizeof(*p) + sizeof(*sin6) * advrtrs;
 2371                 error = SYSCTL_OUT(req, buf, advance);
 2372                 if (error)
 2373                         break;
 2374         }
 2375 
 2376         return (error);
 2377 }

Cache object: 17c005100bd2d5e85a1340601240e27e


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