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


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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6.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: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $
   30  */
   31 
   32 /*-
   33  * Copyright (c) 1982, 1986, 1991, 1993
   34  *      The Regents of the University of California.  All rights reserved.
   35  *
   36  * Redistribution and use in source and binary forms, with or without
   37  * modification, are permitted provided that the following conditions
   38  * are met:
   39  * 1. Redistributions of source code must retain the above copyright
   40  *    notice, this list of conditions and the following disclaimer.
   41  * 2. Redistributions in binary form must reproduce the above copyright
   42  *    notice, this list of conditions and the following disclaimer in the
   43  *    documentation and/or other materials provided with the distribution.
   44  * 4. Neither the name of the University nor the names of its contributors
   45  *    may be used to endorse or promote products derived from this software
   46  *    without specific prior written permission.
   47  *
   48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   58  * SUCH DAMAGE.
   59  *
   60  *      @(#)in.c        8.2 (Berkeley) 11/15/93
   61  */
   62 
   63 #include <sys/cdefs.h>
   64 __FBSDID("$FreeBSD: releng/8.3/sys/netinet6/in6.c 255446 2013-09-10 10:13:14Z des $");
   65 
   66 #include "opt_compat.h"
   67 #include "opt_inet.h"
   68 #include "opt_inet6.h"
   69 
   70 #include <sys/param.h>
   71 #include <sys/errno.h>
   72 #include <sys/jail.h>
   73 #include <sys/malloc.h>
   74 #include <sys/socket.h>
   75 #include <sys/socketvar.h>
   76 #include <sys/sockio.h>
   77 #include <sys/systm.h>
   78 #include <sys/priv.h>
   79 #include <sys/proc.h>
   80 #include <sys/time.h>
   81 #include <sys/kernel.h>
   82 #include <sys/syslog.h>
   83 
   84 #include <net/if.h>
   85 #include <net/if_var.h>
   86 #include <net/if_types.h>
   87 #include <net/route.h>
   88 #include <net/if_dl.h>
   89 #include <net/vnet.h>
   90 
   91 #include <netinet/in.h>
   92 #include <netinet/in_var.h>
   93 #include <net/if_llatbl.h>
   94 #include <netinet/if_ether.h>
   95 #include <netinet/in_systm.h>
   96 #include <netinet/ip.h>
   97 #include <netinet/in_pcb.h>
   98 
   99 #include <netinet/ip6.h>
  100 #include <netinet6/ip6_var.h>
  101 #include <netinet6/nd6.h>
  102 #include <netinet6/mld6_var.h>
  103 #include <netinet6/ip6_mroute.h>
  104 #include <netinet6/in6_ifattach.h>
  105 #include <netinet6/scope6_var.h>
  106 #include <netinet6/in6_pcb.h>
  107 
  108 /*
  109  * Definitions of some costant IP6 addresses.
  110  */
  111 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
  112 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
  113 const struct in6_addr in6addr_nodelocal_allnodes =
  114         IN6ADDR_NODELOCAL_ALLNODES_INIT;
  115 const struct in6_addr in6addr_linklocal_allnodes =
  116         IN6ADDR_LINKLOCAL_ALLNODES_INIT;
  117 const struct in6_addr in6addr_linklocal_allrouters =
  118         IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
  119 const struct in6_addr in6addr_linklocal_allv2routers =
  120         IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
  121 
  122 const struct in6_addr in6mask0 = IN6MASK0;
  123 const struct in6_addr in6mask32 = IN6MASK32;
  124 const struct in6_addr in6mask64 = IN6MASK64;
  125 const struct in6_addr in6mask96 = IN6MASK96;
  126 const struct in6_addr in6mask128 = IN6MASK128;
  127 
  128 const struct sockaddr_in6 sa6_any =
  129         { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
  130 
  131 static int in6_lifaddr_ioctl __P((struct socket *, u_long, caddr_t,
  132         struct ifnet *, struct thread *));
  133 static int in6_ifinit __P((struct ifnet *, struct in6_ifaddr *,
  134         struct sockaddr_in6 *, int));
  135 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
  136 
  137 int     (*faithprefix_p)(struct in6_addr *);
  138 
  139 
  140 
  141 int
  142 in6_mask2len(struct in6_addr *mask, u_char *lim0)
  143 {
  144         int x = 0, y;
  145         u_char *lim = lim0, *p;
  146 
  147         /* ignore the scope_id part */
  148         if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
  149                 lim = (u_char *)mask + sizeof(*mask);
  150         for (p = (u_char *)mask; p < lim; x++, p++) {
  151                 if (*p != 0xff)
  152                         break;
  153         }
  154         y = 0;
  155         if (p < lim) {
  156                 for (y = 0; y < 8; y++) {
  157                         if ((*p & (0x80 >> y)) == 0)
  158                                 break;
  159                 }
  160         }
  161 
  162         /*
  163          * when the limit pointer is given, do a stricter check on the
  164          * remaining bits.
  165          */
  166         if (p < lim) {
  167                 if (y != 0 && (*p & (0x00ff >> y)) != 0)
  168                         return (-1);
  169                 for (p = p + 1; p < lim; p++)
  170                         if (*p != 0)
  171                                 return (-1);
  172         }
  173 
  174         return x * 8 + y;
  175 }
  176 
  177 #define ifa2ia6(ifa)    ((struct in6_ifaddr *)(ifa))
  178 #define ia62ifa(ia6)    (&((ia6)->ia_ifa))
  179 
  180 #ifdef COMPAT_FREEBSD32
  181 struct in6_ndifreq32 {
  182         char ifname[IFNAMSIZ];
  183         uint32_t ifindex;
  184 };
  185 #define SIOCGDEFIFACE32_IN6     _IOWR('i', 86, struct in6_ndifreq32)
  186 #endif
  187 
  188 int
  189 in6_control(struct socket *so, u_long cmd, caddr_t data,
  190     struct ifnet *ifp, struct thread *td)
  191 {
  192         struct  in6_ifreq *ifr = (struct in6_ifreq *)data;
  193         struct  in6_ifaddr *ia = NULL;
  194         struct  in6_aliasreq *ifra = (struct in6_aliasreq *)data;
  195         struct sockaddr_in6 *sa6;
  196         int error;
  197 
  198         switch (cmd) {
  199         case SIOCGETSGCNT_IN6:
  200         case SIOCGETMIFCNT_IN6:
  201                 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
  202         }
  203 
  204         switch(cmd) {
  205         case SIOCAADDRCTL_POLICY:
  206         case SIOCDADDRCTL_POLICY:
  207                 if (td != NULL) {
  208                         error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
  209                         if (error)
  210                                 return (error);
  211                 }
  212                 return (in6_src_ioctl(cmd, data));
  213         }
  214 
  215         if (ifp == NULL)
  216                 return (EOPNOTSUPP);
  217 
  218         switch (cmd) {
  219         case SIOCSNDFLUSH_IN6:
  220         case SIOCSPFXFLUSH_IN6:
  221         case SIOCSRTRFLUSH_IN6:
  222         case SIOCSDEFIFACE_IN6:
  223         case SIOCSIFINFO_FLAGS:
  224         case SIOCSIFINFO_IN6:
  225                 if (td != NULL) {
  226                         error = priv_check(td, PRIV_NETINET_ND6);
  227                         if (error)
  228                                 return (error);
  229                 }
  230                 /* FALLTHROUGH */
  231         case OSIOCGIFINFO_IN6:
  232         case SIOCGIFINFO_IN6:
  233         case SIOCGDRLST_IN6:
  234         case SIOCGPRLST_IN6:
  235         case SIOCGNBRINFO_IN6:
  236         case SIOCGDEFIFACE_IN6:
  237                 return (nd6_ioctl(cmd, data, ifp));
  238 
  239 #ifdef COMPAT_FREEBSD32
  240         case SIOCGDEFIFACE32_IN6:
  241                 {
  242                         struct in6_ndifreq ndif;
  243                         struct in6_ndifreq32 *ndif32;
  244 
  245                         error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
  246                             ifp);
  247                         if (error)
  248                                 return (error);
  249                         ndif32 = (struct in6_ndifreq32 *)data;
  250                         ndif32->ifindex = ndif.ifindex;
  251                         return (0);
  252                 }
  253 #endif
  254         }
  255 
  256         switch (cmd) {
  257         case SIOCSIFPREFIX_IN6:
  258         case SIOCDIFPREFIX_IN6:
  259         case SIOCAIFPREFIX_IN6:
  260         case SIOCCIFPREFIX_IN6:
  261         case SIOCSGIFPREFIX_IN6:
  262         case SIOCGIFPREFIX_IN6:
  263                 log(LOG_NOTICE,
  264                     "prefix ioctls are now invalidated. "
  265                     "please use ifconfig.\n");
  266                 return (EOPNOTSUPP);
  267         }
  268 
  269         switch (cmd) {
  270         case SIOCSSCOPE6:
  271                 if (td != NULL) {
  272                         error = priv_check(td, PRIV_NETINET_SCOPE6);
  273                         if (error)
  274                                 return (error);
  275                 }
  276                 return (scope6_set(ifp,
  277                     (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
  278         case SIOCGSCOPE6:
  279                 return (scope6_get(ifp,
  280                     (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
  281         case SIOCGSCOPE6DEF:
  282                 return (scope6_get_default((struct scope6_id *)
  283                     ifr->ifr_ifru.ifru_scope_id));
  284         }
  285 
  286         switch (cmd) {
  287         case SIOCALIFADDR:
  288                 if (td != NULL) {
  289                         error = priv_check(td, PRIV_NET_ADDIFADDR);
  290                         if (error)
  291                                 return (error);
  292                 }
  293                 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
  294 
  295         case SIOCDLIFADDR:
  296                 if (td != NULL) {
  297                         error = priv_check(td, PRIV_NET_DELIFADDR);
  298                         if (error)
  299                                 return (error);
  300                 }
  301                 /* FALLTHROUGH */
  302         case SIOCGLIFADDR:
  303                 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
  304         }
  305 
  306         /*
  307          * Find address for this interface, if it exists.
  308          *
  309          * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
  310          * only, and used the first interface address as the target of other
  311          * operations (without checking ifra_addr).  This was because netinet
  312          * code/API assumed at most 1 interface address per interface.
  313          * Since IPv6 allows a node to assign multiple addresses
  314          * on a single interface, we almost always look and check the
  315          * presence of ifra_addr, and reject invalid ones here.
  316          * It also decreases duplicated code among SIOC*_IN6 operations.
  317          */
  318         switch (cmd) {
  319         case SIOCAIFADDR_IN6:
  320         case SIOCSIFPHYADDR_IN6:
  321                 sa6 = &ifra->ifra_addr;
  322                 break;
  323         case SIOCSIFADDR_IN6:
  324         case SIOCGIFADDR_IN6:
  325         case SIOCSIFDSTADDR_IN6:
  326         case SIOCSIFNETMASK_IN6:
  327         case SIOCGIFDSTADDR_IN6:
  328         case SIOCGIFNETMASK_IN6:
  329         case SIOCDIFADDR_IN6:
  330         case SIOCGIFPSRCADDR_IN6:
  331         case SIOCGIFPDSTADDR_IN6:
  332         case SIOCGIFAFLAG_IN6:
  333         case SIOCSNDFLUSH_IN6:
  334         case SIOCSPFXFLUSH_IN6:
  335         case SIOCSRTRFLUSH_IN6:
  336         case SIOCGIFALIFETIME_IN6:
  337         case SIOCSIFALIFETIME_IN6:
  338         case SIOCGIFSTAT_IN6:
  339         case SIOCGIFSTAT_ICMP6:
  340                 sa6 = &ifr->ifr_addr;
  341                 break;
  342         case SIOCSIFADDR:
  343         case SIOCSIFBRDADDR:
  344         case SIOCSIFDSTADDR:
  345         case SIOCSIFNETMASK:
  346                 /*
  347                  * Although we should pass any non-INET6 ioctl requests
  348                  * down to driver, we filter some legacy INET requests.
  349                  * Drivers trust SIOCSIFADDR et al to come from an already
  350                  * privileged layer, and do not perform any credentials
  351                  * checks or input validation.
  352                  */
  353                 return (EINVAL);
  354         default:
  355                 sa6 = NULL;
  356                 break;
  357         }
  358         if (sa6 && sa6->sin6_family == AF_INET6) {
  359                 if (sa6->sin6_scope_id != 0)
  360                         error = sa6_embedscope(sa6, 0);
  361                 else
  362                         error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
  363                 if (error != 0)
  364                         return (error);
  365                 if (td != NULL && (error = prison_check_ip6(td->td_ucred,
  366                     &sa6->sin6_addr)) != 0)
  367                         return (error);
  368                 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
  369         } else
  370                 ia = NULL;
  371 
  372         switch (cmd) {
  373         case SIOCSIFADDR_IN6:
  374         case SIOCSIFDSTADDR_IN6:
  375         case SIOCSIFNETMASK_IN6:
  376                 /*
  377                  * Since IPv6 allows a node to assign multiple addresses
  378                  * on a single interface, SIOCSIFxxx ioctls are deprecated.
  379                  */
  380                 /* we decided to obsolete this command (20000704) */
  381                 error = EINVAL;
  382                 goto out;
  383 
  384         case SIOCDIFADDR_IN6:
  385                 /*
  386                  * for IPv4, we look for existing in_ifaddr here to allow
  387                  * "ifconfig if0 delete" to remove the first IPv4 address on
  388                  * the interface.  For IPv6, as the spec allows multiple
  389                  * interface address from the day one, we consider "remove the
  390                  * first one" semantics to be not preferable.
  391                  */
  392                 if (ia == NULL) {
  393                         error = EADDRNOTAVAIL;
  394                         goto out;
  395                 }
  396                 /* FALLTHROUGH */
  397         case SIOCAIFADDR_IN6:
  398                 /*
  399                  * We always require users to specify a valid IPv6 address for
  400                  * the corresponding operation.
  401                  */
  402                 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
  403                     ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
  404                         error = EAFNOSUPPORT;
  405                         goto out;
  406                 }
  407 
  408                 if (td != NULL) {
  409                         error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 
  410                             PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
  411                         if (error)
  412                                 goto out;
  413                 }
  414                 break;
  415 
  416         case SIOCGIFADDR_IN6:
  417                 /* This interface is basically deprecated. use SIOCGIFCONF. */
  418                 /* FALLTHROUGH */
  419         case SIOCGIFAFLAG_IN6:
  420         case SIOCGIFNETMASK_IN6:
  421         case SIOCGIFDSTADDR_IN6:
  422         case SIOCGIFALIFETIME_IN6:
  423                 /* must think again about its semantics */
  424                 if (ia == NULL) {
  425                         error = EADDRNOTAVAIL;
  426                         goto out;
  427                 }
  428                 break;
  429 
  430         case SIOCSIFALIFETIME_IN6:
  431             {
  432                 struct in6_addrlifetime *lt;
  433 
  434                 if (td != NULL) {
  435                         error = priv_check(td, PRIV_NETINET_ALIFETIME6);
  436                         if (error)
  437                                 goto out;
  438                 }
  439                 if (ia == NULL) {
  440                         error = EADDRNOTAVAIL;
  441                         goto out;
  442                 }
  443                 /* sanity for overflow - beware unsigned */
  444                 lt = &ifr->ifr_ifru.ifru_lifetime;
  445                 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
  446                     lt->ia6t_vltime + time_second < time_second) {
  447                         error = EINVAL;
  448                         goto out;
  449                 }
  450                 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
  451                     lt->ia6t_pltime + time_second < time_second) {
  452                         error = EINVAL;
  453                         goto out;
  454                 }
  455                 break;
  456             }
  457         }
  458 
  459         switch (cmd) {
  460         case SIOCGIFADDR_IN6:
  461                 ifr->ifr_addr = ia->ia_addr;
  462                 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
  463                         goto out;
  464                 break;
  465 
  466         case SIOCGIFDSTADDR_IN6:
  467                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
  468                         error = EINVAL;
  469                         goto out;
  470                 }
  471                 /*
  472                  * XXX: should we check if ifa_dstaddr is NULL and return
  473                  * an error?
  474                  */
  475                 ifr->ifr_dstaddr = ia->ia_dstaddr;
  476                 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
  477                         goto out;
  478                 break;
  479 
  480         case SIOCGIFNETMASK_IN6:
  481                 ifr->ifr_addr = ia->ia_prefixmask;
  482                 break;
  483 
  484         case SIOCGIFAFLAG_IN6:
  485                 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
  486                 break;
  487 
  488         case SIOCGIFSTAT_IN6:
  489                 if (ifp == NULL) {
  490                         error = EINVAL;
  491                         goto out;
  492                 }
  493                 bzero(&ifr->ifr_ifru.ifru_stat,
  494                     sizeof(ifr->ifr_ifru.ifru_stat));
  495                 ifr->ifr_ifru.ifru_stat =
  496                     *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat;
  497                 break;
  498 
  499         case SIOCGIFSTAT_ICMP6:
  500                 if (ifp == NULL) {
  501                         error = EINVAL;
  502                         goto out;
  503                 }
  504                 bzero(&ifr->ifr_ifru.ifru_icmp6stat,
  505                     sizeof(ifr->ifr_ifru.ifru_icmp6stat));
  506                 ifr->ifr_ifru.ifru_icmp6stat =
  507                     *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
  508                 break;
  509 
  510         case SIOCGIFALIFETIME_IN6:
  511                 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
  512                 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
  513                         time_t maxexpire;
  514                         struct in6_addrlifetime *retlt =
  515                             &ifr->ifr_ifru.ifru_lifetime;
  516 
  517                         /*
  518                          * XXX: adjust expiration time assuming time_t is
  519                          * signed.
  520                          */
  521                         maxexpire = (-1) &
  522                             ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
  523                         if (ia->ia6_lifetime.ia6t_vltime <
  524                             maxexpire - ia->ia6_updatetime) {
  525                                 retlt->ia6t_expire = ia->ia6_updatetime +
  526                                     ia->ia6_lifetime.ia6t_vltime;
  527                         } else
  528                                 retlt->ia6t_expire = maxexpire;
  529                 }
  530                 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
  531                         time_t maxexpire;
  532                         struct in6_addrlifetime *retlt =
  533                             &ifr->ifr_ifru.ifru_lifetime;
  534 
  535                         /*
  536                          * XXX: adjust expiration time assuming time_t is
  537                          * signed.
  538                          */
  539                         maxexpire = (-1) &
  540                             ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
  541                         if (ia->ia6_lifetime.ia6t_pltime <
  542                             maxexpire - ia->ia6_updatetime) {
  543                                 retlt->ia6t_preferred = ia->ia6_updatetime +
  544                                     ia->ia6_lifetime.ia6t_pltime;
  545                         } else
  546                                 retlt->ia6t_preferred = maxexpire;
  547                 }
  548                 break;
  549 
  550         case SIOCSIFALIFETIME_IN6:
  551                 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
  552                 /* for sanity */
  553                 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
  554                         ia->ia6_lifetime.ia6t_expire =
  555                                 time_second + ia->ia6_lifetime.ia6t_vltime;
  556                 } else
  557                         ia->ia6_lifetime.ia6t_expire = 0;
  558                 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
  559                         ia->ia6_lifetime.ia6t_preferred =
  560                                 time_second + ia->ia6_lifetime.ia6t_pltime;
  561                 } else
  562                         ia->ia6_lifetime.ia6t_preferred = 0;
  563                 break;
  564 
  565         case SIOCAIFADDR_IN6:
  566         {
  567                 int i;
  568                 struct nd_prefixctl pr0;
  569                 struct nd_prefix *pr;
  570 
  571                 /*
  572                  * first, make or update the interface address structure,
  573                  * and link it to the list.
  574                  */
  575                 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
  576                         goto out;
  577                 if (ia != NULL)
  578                         ifa_free(&ia->ia_ifa);
  579                 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
  580                     == NULL) {
  581                         /*
  582                          * this can happen when the user specify the 0 valid
  583                          * lifetime.
  584                          */
  585                         break;
  586                 }
  587 
  588                 /*
  589                  * then, make the prefix on-link on the interface.
  590                  * XXX: we'd rather create the prefix before the address, but
  591                  * we need at least one address to install the corresponding
  592                  * interface route, so we configure the address first.
  593                  */
  594 
  595                 /*
  596                  * convert mask to prefix length (prefixmask has already
  597                  * been validated in in6_update_ifa().
  598                  */
  599                 bzero(&pr0, sizeof(pr0));
  600                 pr0.ndpr_ifp = ifp;
  601                 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
  602                     NULL);
  603                 if (pr0.ndpr_plen == 128) {
  604                         break;  /* we don't need to install a host route. */
  605                 }
  606                 pr0.ndpr_prefix = ifra->ifra_addr;
  607                 /* apply the mask for safety. */
  608                 for (i = 0; i < 4; i++) {
  609                         pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
  610                             ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
  611                 }
  612                 /*
  613                  * XXX: since we don't have an API to set prefix (not address)
  614                  * lifetimes, we just use the same lifetimes as addresses.
  615                  * The (temporarily) installed lifetimes can be overridden by
  616                  * later advertised RAs (when accept_rtadv is non 0), which is
  617                  * an intended behavior.
  618                  */
  619                 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
  620                 pr0.ndpr_raf_auto =
  621                     ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
  622                 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
  623                 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
  624 
  625                 /* add the prefix if not yet. */
  626                 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
  627                         /*
  628                          * nd6_prelist_add will install the corresponding
  629                          * interface route.
  630                          */
  631                         if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
  632                                 goto out;
  633                         if (pr == NULL) {
  634                                 log(LOG_ERR, "nd6_prelist_add succeeded but "
  635                                     "no prefix\n");
  636                                 error = EINVAL;
  637                                 goto out;
  638                         }
  639                 }
  640 
  641                 /* relate the address to the prefix */
  642                 if (ia->ia6_ndpr == NULL) {
  643                         ia->ia6_ndpr = pr;
  644                         pr->ndpr_refcnt++;
  645 
  646                         /*
  647                          * If this is the first autoconf address from the
  648                          * prefix, create a temporary address as well
  649                          * (when required).
  650                          */
  651                         if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
  652                             V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
  653                                 int e;
  654                                 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
  655                                         log(LOG_NOTICE, "in6_control: failed "
  656                                             "to create a temporary address, "
  657                                             "errno=%d\n", e);
  658                                 }
  659                         }
  660                 }
  661 
  662                 /*
  663                  * this might affect the status of autoconfigured addresses,
  664                  * that is, this address might make other addresses detached.
  665                  */
  666                 pfxlist_onlink_check();
  667                 if (error == 0 && ia)
  668                         EVENTHANDLER_INVOKE(ifaddr_event, ifp);
  669                 break;
  670         }
  671 
  672         case SIOCDIFADDR_IN6:
  673         {
  674                 struct nd_prefix *pr;
  675 
  676                 /*
  677                  * If the address being deleted is the only one that owns
  678                  * the corresponding prefix, expire the prefix as well.
  679                  * XXX: theoretically, we don't have to worry about such
  680                  * relationship, since we separate the address management
  681                  * and the prefix management.  We do this, however, to provide
  682                  * as much backward compatibility as possible in terms of
  683                  * the ioctl operation.
  684                  * Note that in6_purgeaddr() will decrement ndpr_refcnt.
  685                  */
  686                 pr = ia->ia6_ndpr;
  687                 in6_purgeaddr(&ia->ia_ifa);
  688                 if (pr && pr->ndpr_refcnt == 0)
  689                         prelist_remove(pr);
  690                 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
  691                 break;
  692         }
  693 
  694         default:
  695                 if (ifp == NULL || ifp->if_ioctl == 0) {
  696                         error = EOPNOTSUPP;
  697                         goto out;
  698                 }
  699                 error = (*ifp->if_ioctl)(ifp, cmd, data);
  700                 goto out;
  701         }
  702 
  703         error = 0;
  704 out:
  705         if (ia != NULL)
  706                 ifa_free(&ia->ia_ifa);
  707         return (error);
  708 }
  709 
  710 /*
  711  * Update parameters of an IPv6 interface address.
  712  * If necessary, a new entry is created and linked into address chains.
  713  * This function is separated from in6_control().
  714  * XXX: should this be performed under splnet()?
  715  */
  716 int
  717 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
  718     struct in6_ifaddr *ia, int flags)
  719 {
  720         int error = 0, hostIsNew = 0, plen = -1;
  721         struct sockaddr_in6 dst6;
  722         struct in6_addrlifetime *lt;
  723         struct in6_multi_mship *imm;
  724         struct in6_multi *in6m_sol;
  725         struct rtentry *rt;
  726         int delay;
  727         char ip6buf[INET6_ADDRSTRLEN];
  728 
  729         /* Validate parameters */
  730         if (ifp == NULL || ifra == NULL) /* this maybe redundant */
  731                 return (EINVAL);
  732 
  733         /*
  734          * The destination address for a p2p link must have a family
  735          * of AF_UNSPEC or AF_INET6.
  736          */
  737         if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
  738             ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
  739             ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
  740                 return (EAFNOSUPPORT);
  741         /*
  742          * validate ifra_prefixmask.  don't check sin6_family, netmask
  743          * does not carry fields other than sin6_len.
  744          */
  745         if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
  746                 return (EINVAL);
  747         /*
  748          * Because the IPv6 address architecture is classless, we require
  749          * users to specify a (non 0) prefix length (mask) for a new address.
  750          * We also require the prefix (when specified) mask is valid, and thus
  751          * reject a non-consecutive mask.
  752          */
  753         if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
  754                 return (EINVAL);
  755         if (ifra->ifra_prefixmask.sin6_len != 0) {
  756                 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
  757                     (u_char *)&ifra->ifra_prefixmask +
  758                     ifra->ifra_prefixmask.sin6_len);
  759                 if (plen <= 0)
  760                         return (EINVAL);
  761         } else {
  762                 /*
  763                  * In this case, ia must not be NULL.  We just use its prefix
  764                  * length.
  765                  */
  766                 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
  767         }
  768         /*
  769          * If the destination address on a p2p interface is specified,
  770          * and the address is a scoped one, validate/set the scope
  771          * zone identifier.
  772          */
  773         dst6 = ifra->ifra_dstaddr;
  774         if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
  775             (dst6.sin6_family == AF_INET6)) {
  776                 struct in6_addr in6_tmp;
  777                 u_int32_t zoneid;
  778 
  779                 in6_tmp = dst6.sin6_addr;
  780                 if (in6_setscope(&in6_tmp, ifp, &zoneid))
  781                         return (EINVAL); /* XXX: should be impossible */
  782 
  783                 if (dst6.sin6_scope_id != 0) {
  784                         if (dst6.sin6_scope_id != zoneid)
  785                                 return (EINVAL);
  786                 } else          /* user omit to specify the ID. */
  787                         dst6.sin6_scope_id = zoneid;
  788 
  789                 /* convert into the internal form */
  790                 if (sa6_embedscope(&dst6, 0))
  791                         return (EINVAL); /* XXX: should be impossible */
  792         }
  793         /*
  794          * The destination address can be specified only for a p2p or a
  795          * loopback interface.  If specified, the corresponding prefix length
  796          * must be 128.
  797          */
  798         if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
  799                 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
  800                         /* XXX: noisy message */
  801                         nd6log((LOG_INFO, "in6_update_ifa: a destination can "
  802                             "be specified for a p2p or a loopback IF only\n"));
  803                         return (EINVAL);
  804                 }
  805                 if (plen != 128) {
  806                         nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
  807                             "be 128 when dstaddr is specified\n"));
  808                         return (EINVAL);
  809                 }
  810         }
  811         /* lifetime consistency check */
  812         lt = &ifra->ifra_lifetime;
  813         if (lt->ia6t_pltime > lt->ia6t_vltime)
  814                 return (EINVAL);
  815         if (lt->ia6t_vltime == 0) {
  816                 /*
  817                  * the following log might be noisy, but this is a typical
  818                  * configuration mistake or a tool's bug.
  819                  */
  820                 nd6log((LOG_INFO,
  821                     "in6_update_ifa: valid lifetime is 0 for %s\n",
  822                     ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
  823 
  824                 if (ia == NULL)
  825                         return (0); /* there's nothing to do */
  826         }
  827 
  828         /*
  829          * If this is a new address, allocate a new ifaddr and link it
  830          * into chains.
  831          */
  832         if (ia == NULL) {
  833                 hostIsNew = 1;
  834                 /*
  835                  * When in6_update_ifa() is called in a process of a received
  836                  * RA, it is called under an interrupt context.  So, we should
  837                  * call malloc with M_NOWAIT.
  838                  */
  839                 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
  840                     M_NOWAIT);
  841                 if (ia == NULL)
  842                         return (ENOBUFS);
  843                 bzero((caddr_t)ia, sizeof(*ia));
  844                 ifa_init(&ia->ia_ifa);
  845                 LIST_INIT(&ia->ia6_memberships);
  846                 /* Initialize the address and masks, and put time stamp */
  847                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
  848                 ia->ia_addr.sin6_family = AF_INET6;
  849                 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
  850                 ia->ia6_createtime = time_second;
  851                 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
  852                         /*
  853                          * XXX: some functions expect that ifa_dstaddr is not
  854                          * NULL for p2p interfaces.
  855                          */
  856                         ia->ia_ifa.ifa_dstaddr =
  857                             (struct sockaddr *)&ia->ia_dstaddr;
  858                 } else {
  859                         ia->ia_ifa.ifa_dstaddr = NULL;
  860                 }
  861                 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
  862                 ia->ia_ifp = ifp;
  863                 ifa_ref(&ia->ia_ifa);                   /* if_addrhead */
  864                 IF_ADDR_LOCK(ifp);
  865                 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
  866                 IF_ADDR_UNLOCK(ifp);
  867 
  868                 ifa_ref(&ia->ia_ifa);                   /* in6_ifaddrhead */
  869                 IN6_IFADDR_WLOCK();
  870                 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
  871                 IN6_IFADDR_WUNLOCK();
  872         }
  873 
  874         /* update timestamp */
  875         ia->ia6_updatetime = time_second;
  876 
  877         /* set prefix mask */
  878         if (ifra->ifra_prefixmask.sin6_len) {
  879                 /*
  880                  * We prohibit changing the prefix length of an existing
  881                  * address, because
  882                  * + such an operation should be rare in IPv6, and
  883                  * + the operation would confuse prefix management.
  884                  */
  885                 if (ia->ia_prefixmask.sin6_len &&
  886                     in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
  887                         nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
  888                             " existing (%s) address should not be changed\n",
  889                             ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
  890                         error = EINVAL;
  891                         goto unlink;
  892                 }
  893                 ia->ia_prefixmask = ifra->ifra_prefixmask;
  894         }
  895 
  896         /*
  897          * If a new destination address is specified, scrub the old one and
  898          * install the new destination.  Note that the interface must be
  899          * p2p or loopback (see the check above.)
  900          */
  901         if (dst6.sin6_family == AF_INET6 &&
  902             !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
  903                 int e;
  904 
  905                 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
  906                     (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
  907                         nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
  908                             "a route to the old destination: %s\n",
  909                             ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
  910                         /* proceed anyway... */
  911                 } else
  912                         ia->ia_flags &= ~IFA_ROUTE;
  913                 ia->ia_dstaddr = dst6;
  914         }
  915 
  916         /*
  917          * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
  918          * to see if the address is deprecated or invalidated, but initialize
  919          * these members for applications.
  920          */
  921         ia->ia6_lifetime = ifra->ifra_lifetime;
  922         if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
  923                 ia->ia6_lifetime.ia6t_expire =
  924                     time_second + ia->ia6_lifetime.ia6t_vltime;
  925         } else
  926                 ia->ia6_lifetime.ia6t_expire = 0;
  927         if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
  928                 ia->ia6_lifetime.ia6t_preferred =
  929                     time_second + ia->ia6_lifetime.ia6t_pltime;
  930         } else
  931                 ia->ia6_lifetime.ia6t_preferred = 0;
  932 
  933         /* reset the interface and routing table appropriately. */
  934         if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
  935                 goto unlink;
  936 
  937         /*
  938          * configure address flags.
  939          */
  940         ia->ia6_flags = ifra->ifra_flags;
  941         /*
  942          * backward compatibility - if IN6_IFF_DEPRECATED is set from the
  943          * userland, make it deprecated.
  944          */
  945         if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
  946                 ia->ia6_lifetime.ia6t_pltime = 0;
  947                 ia->ia6_lifetime.ia6t_preferred = time_second;
  948         }
  949         /*
  950          * Make the address tentative before joining multicast addresses,
  951          * so that corresponding MLD responses would not have a tentative
  952          * source address.
  953          */
  954         ia->ia6_flags &= ~IN6_IFF_DUPLICATED;   /* safety */
  955         if (hostIsNew && in6if_do_dad(ifp))
  956                 ia->ia6_flags |= IN6_IFF_TENTATIVE;
  957 
  958         /*
  959          * We are done if we have simply modified an existing address.
  960          */
  961         if (!hostIsNew)
  962                 return (error);
  963 
  964         /*
  965          * Beyond this point, we should call in6_purgeaddr upon an error,
  966          * not just go to unlink.
  967          */
  968 
  969         /* Join necessary multicast groups */
  970         in6m_sol = NULL;
  971         if ((ifp->if_flags & IFF_MULTICAST) != 0) {
  972                 struct sockaddr_in6 mltaddr, mltmask;
  973                 struct in6_addr llsol;
  974 
  975                 /* join solicited multicast addr for new host id */
  976                 bzero(&llsol, sizeof(struct in6_addr));
  977                 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
  978                 llsol.s6_addr32[1] = 0;
  979                 llsol.s6_addr32[2] = htonl(1);
  980                 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
  981                 llsol.s6_addr8[12] = 0xff;
  982                 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) {
  983                         /* XXX: should not happen */
  984                         log(LOG_ERR, "in6_update_ifa: "
  985                             "in6_setscope failed\n");
  986                         goto cleanup;
  987                 }
  988                 delay = 0;
  989                 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
  990                         /*
  991                          * We need a random delay for DAD on the address
  992                          * being configured.  It also means delaying
  993                          * transmission of the corresponding MLD report to
  994                          * avoid report collision.
  995                          * [draft-ietf-ipv6-rfc2462bis-02.txt]
  996                          */
  997                         delay = arc4random() %
  998                             (MAX_RTR_SOLICITATION_DELAY * hz);
  999                 }
 1000                 imm = in6_joingroup(ifp, &llsol, &error, delay);
 1001                 if (imm == NULL) {
 1002                         nd6log((LOG_WARNING,
 1003                             "in6_update_ifa: addmulti failed for "
 1004                             "%s on %s (errno=%d)\n",
 1005                             ip6_sprintf(ip6buf, &llsol), if_name(ifp),
 1006                             error));
 1007                         goto cleanup;
 1008                 }
 1009                 LIST_INSERT_HEAD(&ia->ia6_memberships,
 1010                     imm, i6mm_chain);
 1011                 in6m_sol = imm->i6mm_maddr;
 1012 
 1013                 bzero(&mltmask, sizeof(mltmask));
 1014                 mltmask.sin6_len = sizeof(struct sockaddr_in6);
 1015                 mltmask.sin6_family = AF_INET6;
 1016                 mltmask.sin6_addr = in6mask32;
 1017 #define MLTMASK_LEN  4  /* mltmask's masklen (=32bit=4octet) */
 1018 
 1019                 /*
 1020                  * join link-local all-nodes address
 1021                  */
 1022                 bzero(&mltaddr, sizeof(mltaddr));
 1023                 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
 1024                 mltaddr.sin6_family = AF_INET6;
 1025                 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
 1026                 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) !=
 1027                     0)
 1028                         goto cleanup; /* XXX: should not fail */
 1029 
 1030                 /*
 1031                  * XXX: do we really need this automatic routes?
 1032                  * We should probably reconsider this stuff.  Most applications
 1033                  * actually do not need the routes, since they usually specify
 1034                  * the outgoing interface.
 1035                  */
 1036                 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
 1037                 if (rt) {
 1038                         /* XXX: only works in !SCOPEDROUTING case. */
 1039                         if (memcmp(&mltaddr.sin6_addr,
 1040                             &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
 1041                             MLTMASK_LEN)) {
 1042                                 RTFREE_LOCKED(rt);
 1043                                 rt = NULL;
 1044                         }
 1045                 }
 1046                 if (!rt) {
 1047                         error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
 1048                             (struct sockaddr *)&ia->ia_addr,
 1049                             (struct sockaddr *)&mltmask, RTF_UP,
 1050                             (struct rtentry **)0);
 1051                         if (error)
 1052                                 goto cleanup;
 1053                 } else {
 1054                         RTFREE_LOCKED(rt);
 1055                 }
 1056 
 1057                 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
 1058                 if (!imm) {
 1059                         nd6log((LOG_WARNING,
 1060                             "in6_update_ifa: addmulti failed for "
 1061                             "%s on %s (errno=%d)\n",
 1062                             ip6_sprintf(ip6buf, &mltaddr.sin6_addr),
 1063                             if_name(ifp), error));
 1064                         goto cleanup;
 1065                 }
 1066                 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
 1067 
 1068                 /*
 1069                  * join node information group address
 1070                  */
 1071                 delay = 0;
 1072                 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
 1073                         /*
 1074                          * The spec doesn't say anything about delay for this
 1075                          * group, but the same logic should apply.
 1076                          */
 1077                         delay = arc4random() %
 1078                             (MAX_RTR_SOLICITATION_DELAY * hz);
 1079                 }
 1080                 if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) {
 1081                         imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error,
 1082                             delay); /* XXX jinmei */
 1083                         if (!imm) {
 1084                                 nd6log((LOG_WARNING, "in6_update_ifa: "
 1085                                     "addmulti failed for %s on %s "
 1086                                     "(errno=%d)\n",
 1087                                     ip6_sprintf(ip6buf, &mltaddr.sin6_addr),
 1088                                     if_name(ifp), error));
 1089                                 /* XXX not very fatal, go on... */
 1090                         } else {
 1091                                 LIST_INSERT_HEAD(&ia->ia6_memberships,
 1092                                     imm, i6mm_chain);
 1093                         }
 1094                 }
 1095 
 1096                 /*
 1097                  * join interface-local all-nodes address.
 1098                  * (ff01::1%ifN, and ff01::%ifN/32)
 1099                  */
 1100                 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
 1101                 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL))
 1102                     != 0)
 1103                         goto cleanup; /* XXX: should not fail */
 1104                 /* XXX: again, do we really need the route? */
 1105                 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
 1106                 if (rt) {
 1107                         if (memcmp(&mltaddr.sin6_addr,
 1108                             &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
 1109                             MLTMASK_LEN)) {
 1110                                 RTFREE_LOCKED(rt);
 1111                                 rt = NULL;
 1112                         }
 1113                 }
 1114                 if (!rt) {
 1115                         error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
 1116                             (struct sockaddr *)&ia->ia_addr,
 1117                             (struct sockaddr *)&mltmask, RTF_UP,
 1118                             (struct rtentry **)0);
 1119                         if (error)
 1120                                 goto cleanup;
 1121                 } else
 1122                         RTFREE_LOCKED(rt);
 1123 
 1124                 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
 1125                 if (!imm) {
 1126                         nd6log((LOG_WARNING, "in6_update_ifa: "
 1127                             "addmulti failed for %s on %s "
 1128                             "(errno=%d)\n",
 1129                             ip6_sprintf(ip6buf, &mltaddr.sin6_addr),
 1130                             if_name(ifp), error));
 1131                         goto cleanup;
 1132                 }
 1133                 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
 1134 #undef  MLTMASK_LEN
 1135         }
 1136 
 1137         /*
 1138          * Perform DAD, if needed.
 1139          * XXX It may be of use, if we can administratively
 1140          * disable DAD.
 1141          */
 1142         if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
 1143             (ia->ia6_flags & IN6_IFF_TENTATIVE))
 1144         {
 1145                 int mindelay, maxdelay;
 1146 
 1147                 delay = 0;
 1148                 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
 1149                         /*
 1150                          * We need to impose a delay before sending an NS
 1151                          * for DAD.  Check if we also needed a delay for the
 1152                          * corresponding MLD message.  If we did, the delay
 1153                          * should be larger than the MLD delay (this could be
 1154                          * relaxed a bit, but this simple logic is at least
 1155                          * safe).
 1156                          * XXX: Break data hiding guidelines and look at
 1157                          * state for the solicited multicast group.
 1158                          */
 1159                         mindelay = 0;
 1160                         if (in6m_sol != NULL &&
 1161                             in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
 1162                                 mindelay = in6m_sol->in6m_timer;
 1163                         }
 1164                         maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
 1165                         if (maxdelay - mindelay == 0)
 1166                                 delay = 0;
 1167                         else {
 1168                                 delay =
 1169                                     (arc4random() % (maxdelay - mindelay)) +
 1170                                     mindelay;
 1171                         }
 1172                 }
 1173                 nd6_dad_start((struct ifaddr *)ia, delay);
 1174         }
 1175 
 1176         KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew"));
 1177         ifa_free(&ia->ia_ifa);
 1178         return (error);
 1179 
 1180   unlink:
 1181         /*
 1182          * XXX: if a change of an existing address failed, keep the entry
 1183          * anyway.
 1184          */
 1185         if (hostIsNew) {
 1186                 in6_unlink_ifa(ia, ifp);
 1187                 ifa_free(&ia->ia_ifa);
 1188         }
 1189         return (error);
 1190 
 1191   cleanup:
 1192         KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew"));
 1193         ifa_free(&ia->ia_ifa);
 1194         in6_purgeaddr(&ia->ia_ifa);
 1195         return error;
 1196 }
 1197 
 1198 void
 1199 in6_purgeaddr(struct ifaddr *ifa)
 1200 {
 1201         struct ifnet *ifp = ifa->ifa_ifp;
 1202         struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
 1203         struct in6_multi_mship *imm;
 1204         struct sockaddr_in6 mltaddr, mltmask;
 1205         struct rtentry rt0;
 1206         struct sockaddr_dl gateway;
 1207         struct sockaddr_in6 mask, addr;
 1208         int plen, error;
 1209         struct rtentry *rt;
 1210         struct ifaddr *ifa0;
 1211 
 1212         /*
 1213          * find another IPv6 address as the gateway for the
 1214          * link-local and node-local all-nodes multicast
 1215          * address routes
 1216          */
 1217         IF_ADDR_LOCK(ifp);
 1218         TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) {
 1219                 if ((ifa0->ifa_addr->sa_family != AF_INET6) ||
 1220                     memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr,
 1221                            &ia->ia_addr.sin6_addr, 
 1222                            sizeof(struct in6_addr)) == 0)
 1223                         continue;
 1224                 else
 1225                         break;
 1226         }
 1227         if (ifa0 != NULL)
 1228                 ifa_ref(ifa0);
 1229         IF_ADDR_UNLOCK(ifp);
 1230 
 1231         /*
 1232          * Remove the loopback route to the interface address.
 1233          * The check for the current setting of "nd6_useloopback" 
 1234          * is not needed.
 1235          */
 1236         if (ia->ia_flags & IFA_RTSELF) {
 1237                 error = ifa_del_loopback_route((struct ifaddr *)ia,
 1238                                        (struct sockaddr *)&ia->ia_addr);
 1239                 if (error == 0)
 1240                         ia->ia_flags &= ~IFA_RTSELF;
 1241         }
 1242 
 1243         /* stop DAD processing */
 1244         nd6_dad_stop(ifa);
 1245 
 1246         IF_AFDATA_LOCK(ifp);
 1247         lla_lookup(LLTABLE6(ifp), (LLE_DELETE | LLE_IFADDR),
 1248             (struct sockaddr *)&ia->ia_addr);
 1249         IF_AFDATA_UNLOCK(ifp);
 1250 
 1251         /*
 1252          * initialize for rtmsg generation
 1253          */
 1254         bzero(&gateway, sizeof(gateway));
 1255         gateway.sdl_len = sizeof(gateway);
 1256         gateway.sdl_family = AF_LINK;
 1257         gateway.sdl_nlen = 0;
 1258         gateway.sdl_alen = ifp->if_addrlen;
 1259         /* */
 1260         bzero(&rt0, sizeof(rt0));
 1261         rt0.rt_gateway = (struct sockaddr *)&gateway;
 1262         memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
 1263         memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
 1264         rt_mask(&rt0) = (struct sockaddr *)&mask;
 1265         rt_key(&rt0) = (struct sockaddr *)&addr;
 1266         rt0.rt_flags = RTF_HOST | RTF_STATIC;
 1267         rt_newaddrmsg(RTM_DELETE, ifa, 0, &rt0);
 1268 
 1269         /*
 1270          * leave from multicast groups we have joined for the interface
 1271          */
 1272         while ((imm = ia->ia6_memberships.lh_first) != NULL) {
 1273                 LIST_REMOVE(imm, i6mm_chain);
 1274                 in6_leavegroup(imm);
 1275         }
 1276 
 1277         /*
 1278          * remove the link-local all-nodes address
 1279          */
 1280         bzero(&mltmask, sizeof(mltmask));
 1281         mltmask.sin6_len = sizeof(struct sockaddr_in6);
 1282         mltmask.sin6_family = AF_INET6;
 1283         mltmask.sin6_addr = in6mask32;
 1284 
 1285         bzero(&mltaddr, sizeof(mltaddr));
 1286         mltaddr.sin6_len = sizeof(struct sockaddr_in6);
 1287         mltaddr.sin6_family = AF_INET6;
 1288         mltaddr.sin6_addr = in6addr_linklocal_allnodes;
 1289 
 1290         if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
 1291                 goto cleanup; 
 1292 
 1293         rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
 1294         if (rt != NULL && rt->rt_gateway != NULL &&
 1295             (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 
 1296                     &ia->ia_addr.sin6_addr,
 1297                     sizeof(ia->ia_addr.sin6_addr)) == 0)) {
 1298                 /* 
 1299                  * if no more IPv6 address exists on this interface
 1300                  * then remove the multicast address route
 1301                  */
 1302                 if (ifa0 == NULL) {
 1303                         memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr, 
 1304                                sizeof(mltaddr.sin6_addr));
 1305                         RTFREE_LOCKED(rt);
 1306                         error = rtrequest(RTM_DELETE, (struct sockaddr *)&mltaddr,
 1307                                           (struct sockaddr *)&ia->ia_addr,
 1308                                           (struct sockaddr *)&mltmask, RTF_UP,
 1309                                           (struct rtentry **)0);
 1310                         if (error)
 1311                                 log(LOG_INFO, "in6_purgeaddr: link-local all-nodes"
 1312                                     "multicast address deletion error\n");
 1313                 } else {
 1314                         /*
 1315                          * replace the gateway of the route
 1316                          */
 1317                         struct sockaddr_in6 sa;
 1318 
 1319                         bzero(&sa, sizeof(sa));
 1320                         sa.sin6_len = sizeof(struct sockaddr_in6);
 1321                         sa.sin6_family = AF_INET6;
 1322                         memcpy(&sa.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 
 1323                                sizeof(sa.sin6_addr));
 1324                         in6_setscope(&sa.sin6_addr, ifa0->ifa_ifp, NULL);
 1325                         memcpy(rt->rt_gateway, &sa, sizeof(sa));
 1326                         RTFREE_LOCKED(rt);
 1327                 }
 1328         } else {
 1329                 if (rt != NULL)
 1330                         RTFREE_LOCKED(rt);
 1331         }
 1332 
 1333         /*
 1334          * remove the node-local all-nodes address
 1335          */
 1336         mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
 1337         if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) !=
 1338             0)
 1339                 goto cleanup;
 1340 
 1341         rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
 1342         if (rt != NULL && rt->rt_gateway != NULL &&
 1343             (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 
 1344                     &ia->ia_addr.sin6_addr,
 1345                     sizeof(ia->ia_addr.sin6_addr)) == 0)) {
 1346                 /* 
 1347                  * if no more IPv6 address exists on this interface
 1348                  * then remove the multicast address route
 1349                  */
 1350                 if (ifa0 == NULL) {
 1351                         memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr, 
 1352                                sizeof(mltaddr.sin6_addr));
 1353 
 1354                         RTFREE_LOCKED(rt);
 1355                         error = rtrequest(RTM_DELETE, (struct sockaddr *)&mltaddr,
 1356                                           (struct sockaddr *)&ia->ia_addr,
 1357                                           (struct sockaddr *)&mltmask, RTF_UP,
 1358                                           (struct rtentry **)0);
 1359 
 1360                         if (error)
 1361                                 log(LOG_INFO, "in6_purgeaddr: node-local all-nodes"
 1362                                     "multicast address deletion error\n");
 1363                 } else {
 1364                         /*
 1365                          * replace the gateway of the route
 1366                          */
 1367                         struct sockaddr_in6 sa;
 1368 
 1369                         bzero(&sa, sizeof(sa));
 1370                         sa.sin6_len = sizeof(struct sockaddr_in6);
 1371                         sa.sin6_family = AF_INET6;
 1372                         memcpy(&sa.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 
 1373                                sizeof(sa.sin6_addr));
 1374                         in6_setscope(&sa.sin6_addr, ifa0->ifa_ifp, NULL);
 1375                         memcpy(rt->rt_gateway, &sa, sizeof(sa));
 1376                         RTFREE_LOCKED(rt);
 1377                 }
 1378         } else {
 1379                 if (rt != NULL)
 1380                         RTFREE_LOCKED(rt);
 1381         }
 1382 
 1383 cleanup:
 1384         if (ifa0 != NULL)
 1385                 ifa_free(ifa0);
 1386 
 1387         plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
 1388         if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
 1389                 int error;
 1390                 struct sockaddr *dstaddr;
 1391 
 1392                 /* 
 1393                  * use the interface address if configuring an
 1394                  * interface address with a /128 prefix len
 1395                  */
 1396                 if (ia->ia_dstaddr.sin6_family == AF_INET6)
 1397                         dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
 1398                 else
 1399                         dstaddr = (struct sockaddr *)&ia->ia_addr;
 1400 
 1401                 error = rtrequest(RTM_DELETE,
 1402                     (struct sockaddr *)dstaddr,
 1403                     (struct sockaddr *)&ia->ia_addr,
 1404                     (struct sockaddr *)&ia->ia_prefixmask,
 1405                     ia->ia_flags | RTF_HOST, NULL);
 1406                 if (error != 0)
 1407                         return;
 1408                 ia->ia_flags &= ~IFA_ROUTE;
 1409         }
 1410 
 1411         in6_unlink_ifa(ia, ifp);
 1412 }
 1413 
 1414 static void
 1415 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
 1416 {
 1417         int     s = splnet();
 1418 
 1419         IF_ADDR_LOCK(ifp);
 1420         TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
 1421         IF_ADDR_UNLOCK(ifp);
 1422         ifa_free(&ia->ia_ifa);                  /* if_addrhead */
 1423 
 1424         /*
 1425          * Defer the release of what might be the last reference to the
 1426          * in6_ifaddr so that it can't be freed before the remainder of the
 1427          * cleanup.
 1428          */
 1429         IN6_IFADDR_WLOCK();
 1430         TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
 1431         IN6_IFADDR_WUNLOCK();
 1432 
 1433         /*
 1434          * Release the reference to the base prefix.  There should be a
 1435          * positive reference.
 1436          */
 1437         if (ia->ia6_ndpr == NULL) {
 1438                 nd6log((LOG_NOTICE,
 1439                     "in6_unlink_ifa: autoconf'ed address "
 1440                     "%p has no prefix\n", ia));
 1441         } else {
 1442                 ia->ia6_ndpr->ndpr_refcnt--;
 1443                 ia->ia6_ndpr = NULL;
 1444         }
 1445 
 1446         /*
 1447          * Also, if the address being removed is autoconf'ed, call
 1448          * pfxlist_onlink_check() since the release might affect the status of
 1449          * other (detached) addresses.
 1450          */
 1451         if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
 1452                 pfxlist_onlink_check();
 1453         }
 1454         ifa_free(&ia->ia_ifa);                  /* in6_ifaddrhead */
 1455         splx(s);
 1456 }
 1457 
 1458 void
 1459 in6_purgeif(struct ifnet *ifp)
 1460 {
 1461         struct ifaddr *ifa, *nifa;
 1462 
 1463         TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
 1464                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1465                         continue;
 1466                 in6_purgeaddr(ifa);
 1467         }
 1468 
 1469         in6_ifdetach(ifp);
 1470 }
 1471 
 1472 /*
 1473  * SIOC[GAD]LIFADDR.
 1474  *      SIOCGLIFADDR: get first address. (?)
 1475  *      SIOCGLIFADDR with IFLR_PREFIX:
 1476  *              get first address that matches the specified prefix.
 1477  *      SIOCALIFADDR: add the specified address.
 1478  *      SIOCALIFADDR with IFLR_PREFIX:
 1479  *              add the specified prefix, filling hostid part from
 1480  *              the first link-local address.  prefixlen must be <= 64.
 1481  *      SIOCDLIFADDR: delete the specified address.
 1482  *      SIOCDLIFADDR with IFLR_PREFIX:
 1483  *              delete the first address that matches the specified prefix.
 1484  * return values:
 1485  *      EINVAL on invalid parameters
 1486  *      EADDRNOTAVAIL on prefix match failed/specified address not found
 1487  *      other values may be returned from in6_ioctl()
 1488  *
 1489  * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
 1490  * this is to accomodate address naming scheme other than RFC2374,
 1491  * in the future.
 1492  * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
 1493  * address encoding scheme. (see figure on page 8)
 1494  */
 1495 static int
 1496 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
 1497     struct ifnet *ifp, struct thread *td)
 1498 {
 1499         struct if_laddrreq *iflr = (struct if_laddrreq *)data;
 1500         struct ifaddr *ifa;
 1501         struct sockaddr *sa;
 1502 
 1503         /* sanity checks */
 1504         if (!data || !ifp) {
 1505                 panic("invalid argument to in6_lifaddr_ioctl");
 1506                 /* NOTREACHED */
 1507         }
 1508 
 1509         switch (cmd) {
 1510         case SIOCGLIFADDR:
 1511                 /* address must be specified on GET with IFLR_PREFIX */
 1512                 if ((iflr->flags & IFLR_PREFIX) == 0)
 1513                         break;
 1514                 /* FALLTHROUGH */
 1515         case SIOCALIFADDR:
 1516         case SIOCDLIFADDR:
 1517                 /* address must be specified on ADD and DELETE */
 1518                 sa = (struct sockaddr *)&iflr->addr;
 1519                 if (sa->sa_family != AF_INET6)
 1520                         return EINVAL;
 1521                 if (sa->sa_len != sizeof(struct sockaddr_in6))
 1522                         return EINVAL;
 1523                 /* XXX need improvement */
 1524                 sa = (struct sockaddr *)&iflr->dstaddr;
 1525                 if (sa->sa_family && sa->sa_family != AF_INET6)
 1526                         return EINVAL;
 1527                 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
 1528                         return EINVAL;
 1529                 break;
 1530         default: /* shouldn't happen */
 1531 #if 0
 1532                 panic("invalid cmd to in6_lifaddr_ioctl");
 1533                 /* NOTREACHED */
 1534 #else
 1535                 return EOPNOTSUPP;
 1536 #endif
 1537         }
 1538         if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
 1539                 return EINVAL;
 1540 
 1541         switch (cmd) {
 1542         case SIOCALIFADDR:
 1543             {
 1544                 struct in6_aliasreq ifra;
 1545                 struct in6_addr *hostid = NULL;
 1546                 int prefixlen;
 1547 
 1548                 ifa = NULL;
 1549                 if ((iflr->flags & IFLR_PREFIX) != 0) {
 1550                         struct sockaddr_in6 *sin6;
 1551 
 1552                         /*
 1553                          * hostid is to fill in the hostid part of the
 1554                          * address.  hostid points to the first link-local
 1555                          * address attached to the interface.
 1556                          */
 1557                         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
 1558                         if (!ifa)
 1559                                 return EADDRNOTAVAIL;
 1560                         hostid = IFA_IN6(ifa);
 1561 
 1562                         /* prefixlen must be <= 64. */
 1563                         if (64 < iflr->prefixlen) {
 1564                                 if (ifa != NULL)
 1565                                         ifa_free(ifa);
 1566                                 return EINVAL;
 1567                         }
 1568                         prefixlen = iflr->prefixlen;
 1569 
 1570                         /* hostid part must be zero. */
 1571                         sin6 = (struct sockaddr_in6 *)&iflr->addr;
 1572                         if (sin6->sin6_addr.s6_addr32[2] != 0 ||
 1573                             sin6->sin6_addr.s6_addr32[3] != 0) {
 1574                                 if (ifa != NULL)
 1575                                         ifa_free(ifa);
 1576                                 return EINVAL;
 1577                         }
 1578                 } else
 1579                         prefixlen = iflr->prefixlen;
 1580 
 1581                 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
 1582                 bzero(&ifra, sizeof(ifra));
 1583                 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
 1584 
 1585                 bcopy(&iflr->addr, &ifra.ifra_addr,
 1586                     ((struct sockaddr *)&iflr->addr)->sa_len);
 1587                 if (hostid) {
 1588                         /* fill in hostid part */
 1589                         ifra.ifra_addr.sin6_addr.s6_addr32[2] =
 1590                             hostid->s6_addr32[2];
 1591                         ifra.ifra_addr.sin6_addr.s6_addr32[3] =
 1592                             hostid->s6_addr32[3];
 1593                 }
 1594 
 1595                 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
 1596                         bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
 1597                             ((struct sockaddr *)&iflr->dstaddr)->sa_len);
 1598                         if (hostid) {
 1599                                 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
 1600                                     hostid->s6_addr32[2];
 1601                                 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
 1602                                     hostid->s6_addr32[3];
 1603                         }
 1604                 }
 1605                 if (ifa != NULL)
 1606                         ifa_free(ifa);
 1607 
 1608                 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
 1609                 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
 1610 
 1611                 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
 1612                 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
 1613             }
 1614         case SIOCGLIFADDR:
 1615         case SIOCDLIFADDR:
 1616             {
 1617                 struct in6_ifaddr *ia;
 1618                 struct in6_addr mask, candidate, match;
 1619                 struct sockaddr_in6 *sin6;
 1620                 int cmp;
 1621 
 1622                 bzero(&mask, sizeof(mask));
 1623                 if (iflr->flags & IFLR_PREFIX) {
 1624                         /* lookup a prefix rather than address. */
 1625                         in6_prefixlen2mask(&mask, iflr->prefixlen);
 1626 
 1627                         sin6 = (struct sockaddr_in6 *)&iflr->addr;
 1628                         bcopy(&sin6->sin6_addr, &match, sizeof(match));
 1629                         match.s6_addr32[0] &= mask.s6_addr32[0];
 1630                         match.s6_addr32[1] &= mask.s6_addr32[1];
 1631                         match.s6_addr32[2] &= mask.s6_addr32[2];
 1632                         match.s6_addr32[3] &= mask.s6_addr32[3];
 1633 
 1634                         /* if you set extra bits, that's wrong */
 1635                         if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
 1636                                 return EINVAL;
 1637 
 1638                         cmp = 1;
 1639                 } else {
 1640                         if (cmd == SIOCGLIFADDR) {
 1641                                 /* on getting an address, take the 1st match */
 1642                                 cmp = 0;        /* XXX */
 1643                         } else {
 1644                                 /* on deleting an address, do exact match */
 1645                                 in6_prefixlen2mask(&mask, 128);
 1646                                 sin6 = (struct sockaddr_in6 *)&iflr->addr;
 1647                                 bcopy(&sin6->sin6_addr, &match, sizeof(match));
 1648 
 1649                                 cmp = 1;
 1650                         }
 1651                 }
 1652 
 1653                 IF_ADDR_LOCK(ifp);
 1654                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1655                         if (ifa->ifa_addr->sa_family != AF_INET6)
 1656                                 continue;
 1657                         if (!cmp)
 1658                                 break;
 1659 
 1660                         /*
 1661                          * XXX: this is adhoc, but is necessary to allow
 1662                          * a user to specify fe80::/64 (not /10) for a
 1663                          * link-local address.
 1664                          */
 1665                         bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
 1666                         in6_clearscope(&candidate);
 1667                         candidate.s6_addr32[0] &= mask.s6_addr32[0];
 1668                         candidate.s6_addr32[1] &= mask.s6_addr32[1];
 1669                         candidate.s6_addr32[2] &= mask.s6_addr32[2];
 1670                         candidate.s6_addr32[3] &= mask.s6_addr32[3];
 1671                         if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
 1672                                 break;
 1673                 }
 1674                 if (ifa != NULL)
 1675                         ifa_ref(ifa);
 1676                 IF_ADDR_UNLOCK(ifp);
 1677                 if (!ifa)
 1678                         return EADDRNOTAVAIL;
 1679                 ia = ifa2ia6(ifa);
 1680 
 1681                 if (cmd == SIOCGLIFADDR) {
 1682                         int error;
 1683 
 1684                         /* fill in the if_laddrreq structure */
 1685                         bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
 1686                         error = sa6_recoverscope(
 1687                             (struct sockaddr_in6 *)&iflr->addr);
 1688                         if (error != 0) {
 1689                                 ifa_free(ifa);
 1690                                 return (error);
 1691                         }
 1692 
 1693                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 1694                                 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
 1695                                     ia->ia_dstaddr.sin6_len);
 1696                                 error = sa6_recoverscope(
 1697                                     (struct sockaddr_in6 *)&iflr->dstaddr);
 1698                                 if (error != 0) {
 1699                                         ifa_free(ifa);
 1700                                         return (error);
 1701                                 }
 1702                         } else
 1703                                 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
 1704 
 1705                         iflr->prefixlen =
 1706                             in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
 1707 
 1708                         iflr->flags = ia->ia6_flags;    /* XXX */
 1709                         ifa_free(ifa);
 1710 
 1711                         return 0;
 1712                 } else {
 1713                         struct in6_aliasreq ifra;
 1714 
 1715                         /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
 1716                         bzero(&ifra, sizeof(ifra));
 1717                         bcopy(iflr->iflr_name, ifra.ifra_name,
 1718                             sizeof(ifra.ifra_name));
 1719 
 1720                         bcopy(&ia->ia_addr, &ifra.ifra_addr,
 1721                             ia->ia_addr.sin6_len);
 1722                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 1723                                 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
 1724                                     ia->ia_dstaddr.sin6_len);
 1725                         } else {
 1726                                 bzero(&ifra.ifra_dstaddr,
 1727                                     sizeof(ifra.ifra_dstaddr));
 1728                         }
 1729                         bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
 1730                             ia->ia_prefixmask.sin6_len);
 1731 
 1732                         ifra.ifra_flags = ia->ia6_flags;
 1733                         ifa_free(ifa);
 1734                         return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
 1735                             ifp, td);
 1736                 }
 1737             }
 1738         }
 1739 
 1740         return EOPNOTSUPP;      /* just for safety */
 1741 }
 1742 
 1743 /*
 1744  * Initialize an interface's intetnet6 address
 1745  * and routing table entry.
 1746  */
 1747 static int
 1748 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
 1749     struct sockaddr_in6 *sin6, int newhost)
 1750 {
 1751         int     error = 0, plen, ifacount = 0;
 1752         int     s = splimp();
 1753         struct ifaddr *ifa;
 1754 
 1755         /*
 1756          * Give the interface a chance to initialize
 1757          * if this is its first address,
 1758          * and to validate the address if necessary.
 1759          */
 1760         IF_ADDR_LOCK(ifp);
 1761         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1762                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1763                         continue;
 1764                 ifacount++;
 1765         }
 1766         IF_ADDR_UNLOCK(ifp);
 1767 
 1768         ia->ia_addr = *sin6;
 1769 
 1770         if (ifacount <= 1 && ifp->if_ioctl) {
 1771                 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
 1772                 if (error) {
 1773                         splx(s);
 1774                         return (error);
 1775                 }
 1776         }
 1777         splx(s);
 1778 
 1779         ia->ia_ifa.ifa_metric = ifp->if_metric;
 1780 
 1781         /* we could do in(6)_socktrim here, but just omit it at this moment. */
 1782 
 1783         /*
 1784          * Special case:
 1785          * If a new destination address is specified for a point-to-point
 1786          * interface, install a route to the destination as an interface
 1787          * direct route. 
 1788          * XXX: the logic below rejects assigning multiple addresses on a p2p
 1789          * interface that share the same destination.
 1790          */
 1791         plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
 1792         if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
 1793             ia->ia_dstaddr.sin6_family == AF_INET6) {
 1794                 int rtflags = RTF_UP | RTF_HOST;
 1795 
 1796                 error = rtrequest(RTM_ADD,
 1797                     (struct sockaddr *)&ia->ia_dstaddr,
 1798                     (struct sockaddr *)&ia->ia_addr,
 1799                     (struct sockaddr *)&ia->ia_prefixmask,
 1800                     ia->ia_flags | rtflags, NULL);
 1801                 if (error != 0)
 1802                         return (error);
 1803                 ia->ia_flags |= IFA_ROUTE;
 1804                 /*
 1805                  * Handle the case for ::1 .
 1806                  */
 1807                 if (ifp->if_flags & IFF_LOOPBACK)
 1808                         ia->ia_flags |= IFA_RTSELF;
 1809         }
 1810 
 1811         /*
 1812          * add a loopback route to self
 1813          */
 1814         if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
 1815                 error = ifa_add_loopback_route((struct ifaddr *)ia,
 1816                                        (struct sockaddr *)&ia->ia_addr);
 1817                 if (error == 0)
 1818                         ia->ia_flags |= IFA_RTSELF;
 1819         }
 1820 
 1821         /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */
 1822         if (newhost) {
 1823                 struct llentry *ln;
 1824                 struct rtentry rt;
 1825                 struct sockaddr_dl gateway;
 1826                 struct sockaddr_in6 mask, addr;
 1827 
 1828                 IF_AFDATA_LOCK(ifp);
 1829                 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
 1830                 ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR | LLE_EXCLUSIVE),
 1831                     (struct sockaddr *)&ia->ia_addr);
 1832                 IF_AFDATA_UNLOCK(ifp);
 1833                 if (ln != NULL) {
 1834                         ln->la_expire = 0;  /* for IPv6 this means permanent */
 1835                         ln->ln_state = ND6_LLINFO_REACHABLE;
 1836                         /*
 1837                          * initialize for rtmsg generation
 1838                          */
 1839                         bzero(&gateway, sizeof(gateway));
 1840                         gateway.sdl_len = sizeof(gateway);
 1841                         gateway.sdl_family = AF_LINK;
 1842                         gateway.sdl_nlen = 0;
 1843                         gateway.sdl_alen = 6;
 1844                         memcpy(gateway.sdl_data, &ln->ll_addr.mac_aligned, sizeof(ln->ll_addr));
 1845                         /* */
 1846                         LLE_WUNLOCK(ln);
 1847                 }
 1848 
 1849                 bzero(&rt, sizeof(rt));
 1850                 rt.rt_gateway = (struct sockaddr *)&gateway;
 1851                 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
 1852                 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
 1853                 rt_mask(&rt) = (struct sockaddr *)&mask;
 1854                 rt_key(&rt) = (struct sockaddr *)&addr;
 1855                 rt.rt_flags = RTF_UP | RTF_HOST | RTF_STATIC;
 1856                 rt_newaddrmsg(RTM_ADD, &ia->ia_ifa, 0, &rt);
 1857         }
 1858 
 1859         return (error);
 1860 }
 1861 
 1862 /*
 1863  * Find an IPv6 interface link-local address specific to an interface.
 1864  * ifaddr is returned referenced.
 1865  */
 1866 struct in6_ifaddr *
 1867 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
 1868 {
 1869         struct ifaddr *ifa;
 1870 
 1871         IF_ADDR_LOCK(ifp);
 1872         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1873                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1874                         continue;
 1875                 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
 1876                         if ((((struct in6_ifaddr *)ifa)->ia6_flags &
 1877                              ignoreflags) != 0)
 1878                                 continue;
 1879                         ifa_ref(ifa);
 1880                         break;
 1881                 }
 1882         }
 1883         IF_ADDR_UNLOCK(ifp);
 1884 
 1885         return ((struct in6_ifaddr *)ifa);
 1886 }
 1887 
 1888 
 1889 /*
 1890  * find the internet address corresponding to a given interface and address.
 1891  * ifaddr is returned referenced.
 1892  */
 1893 struct in6_ifaddr *
 1894 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
 1895 {
 1896         struct ifaddr *ifa;
 1897 
 1898         IF_ADDR_LOCK(ifp);
 1899         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1900                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1901                         continue;
 1902                 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
 1903                         ifa_ref(ifa);
 1904                         break;
 1905                 }
 1906         }
 1907         IF_ADDR_UNLOCK(ifp);
 1908 
 1909         return ((struct in6_ifaddr *)ifa);
 1910 }
 1911 
 1912 /*
 1913  * Convert IP6 address to printable (loggable) representation. Caller
 1914  * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
 1915  */
 1916 static char digits[] = "0123456789abcdef";
 1917 char *
 1918 ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
 1919 {
 1920         int i;
 1921         char *cp;
 1922         const u_int16_t *a = (const u_int16_t *)addr;
 1923         const u_int8_t *d;
 1924         int dcolon = 0, zero = 0;
 1925 
 1926         cp = ip6buf;
 1927 
 1928         for (i = 0; i < 8; i++) {
 1929                 if (dcolon == 1) {
 1930                         if (*a == 0) {
 1931                                 if (i == 7)
 1932                                         *cp++ = ':';
 1933                                 a++;
 1934                                 continue;
 1935                         } else
 1936                                 dcolon = 2;
 1937                 }
 1938                 if (*a == 0) {
 1939                         if (dcolon == 0 && *(a + 1) == 0) {
 1940                                 if (i == 0)
 1941                                         *cp++ = ':';
 1942                                 *cp++ = ':';
 1943                                 dcolon = 1;
 1944                         } else {
 1945                                 *cp++ = '';
 1946                                 *cp++ = ':';
 1947                         }
 1948                         a++;
 1949                         continue;
 1950                 }
 1951                 d = (const u_char *)a;
 1952                 /* Try to eliminate leading zeros in printout like in :0001. */
 1953                 zero = 1;
 1954                 *cp = digits[*d >> 4];
 1955                 if (*cp != '') {
 1956                         zero = 0;
 1957                         cp++;
 1958                 }
 1959                 *cp = digits[*d++ & 0xf];
 1960                 if (zero == 0 || (*cp != '')) {
 1961                         zero = 0;
 1962                         cp++;
 1963                 }
 1964                 *cp = digits[*d >> 4];
 1965                 if (zero == 0 || (*cp != '')) {
 1966                         zero = 0;
 1967                         cp++;
 1968                 }
 1969                 *cp++ = digits[*d & 0xf];
 1970                 *cp++ = ':';
 1971                 a++;
 1972         }
 1973         *--cp = '\0';
 1974         return (ip6buf);
 1975 }
 1976 
 1977 int
 1978 in6_localaddr(struct in6_addr *in6)
 1979 {
 1980         struct in6_ifaddr *ia;
 1981 
 1982         if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
 1983                 return 1;
 1984 
 1985         IN6_IFADDR_RLOCK();
 1986         TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
 1987                 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
 1988                     &ia->ia_prefixmask.sin6_addr)) {
 1989                         IN6_IFADDR_RUNLOCK();
 1990                         return 1;
 1991                 }
 1992         }
 1993         IN6_IFADDR_RUNLOCK();
 1994 
 1995         return (0);
 1996 }
 1997 
 1998 int
 1999 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
 2000 {
 2001         struct in6_ifaddr *ia;
 2002 
 2003         IN6_IFADDR_RLOCK();
 2004         TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
 2005                 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
 2006                                        &sa6->sin6_addr) &&
 2007                     (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) {
 2008                         IN6_IFADDR_RUNLOCK();
 2009                         return (1); /* true */
 2010                 }
 2011 
 2012                 /* XXX: do we still have to go thru the rest of the list? */
 2013         }
 2014         IN6_IFADDR_RUNLOCK();
 2015 
 2016         return (0);             /* false */
 2017 }
 2018 
 2019 /*
 2020  * return length of part which dst and src are equal
 2021  * hard coding...
 2022  */
 2023 int
 2024 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
 2025 {
 2026         int match = 0;
 2027         u_char *s = (u_char *)src, *d = (u_char *)dst;
 2028         u_char *lim = s + 16, r;
 2029 
 2030         while (s < lim)
 2031                 if ((r = (*d++ ^ *s++)) != 0) {
 2032                         while (r < 128) {
 2033                                 match++;
 2034                                 r <<= 1;
 2035                         }
 2036                         break;
 2037                 } else
 2038                         match += 8;
 2039         return match;
 2040 }
 2041 
 2042 /* XXX: to be scope conscious */
 2043 int
 2044 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
 2045 {
 2046         int bytelen, bitlen;
 2047 
 2048         /* sanity check */
 2049         if (0 > len || len > 128) {
 2050                 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
 2051                     len);
 2052                 return (0);
 2053         }
 2054 
 2055         bytelen = len / 8;
 2056         bitlen = len % 8;
 2057 
 2058         if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
 2059                 return (0);
 2060         if (bitlen != 0 &&
 2061             p1->s6_addr[bytelen] >> (8 - bitlen) !=
 2062             p2->s6_addr[bytelen] >> (8 - bitlen))
 2063                 return (0);
 2064 
 2065         return (1);
 2066 }
 2067 
 2068 void
 2069 in6_prefixlen2mask(struct in6_addr *maskp, int len)
 2070 {
 2071         u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
 2072         int bytelen, bitlen, i;
 2073 
 2074         /* sanity check */
 2075         if (0 > len || len > 128) {
 2076                 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
 2077                     len);
 2078                 return;
 2079         }
 2080 
 2081         bzero(maskp, sizeof(*maskp));
 2082         bytelen = len / 8;
 2083         bitlen = len % 8;
 2084         for (i = 0; i < bytelen; i++)
 2085                 maskp->s6_addr[i] = 0xff;
 2086         if (bitlen)
 2087                 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
 2088 }
 2089 
 2090 /*
 2091  * return the best address out of the same scope. if no address was
 2092  * found, return the first valid address from designated IF.
 2093  */
 2094 struct in6_ifaddr *
 2095 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
 2096 {
 2097         int dst_scope = in6_addrscope(dst), blen = -1, tlen;
 2098         struct ifaddr *ifa;
 2099         struct in6_ifaddr *besta = 0;
 2100         struct in6_ifaddr *dep[2];      /* last-resort: deprecated */
 2101 
 2102         dep[0] = dep[1] = NULL;
 2103 
 2104         /*
 2105          * We first look for addresses in the same scope.
 2106          * If there is one, return it.
 2107          * If two or more, return one which matches the dst longest.
 2108          * If none, return one of global addresses assigned other ifs.
 2109          */
 2110         IF_ADDR_LOCK(ifp);
 2111         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 2112                 if (ifa->ifa_addr->sa_family != AF_INET6)
 2113                         continue;
 2114                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
 2115                         continue; /* XXX: is there any case to allow anycast? */
 2116                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
 2117                         continue; /* don't use this interface */
 2118                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
 2119                         continue;
 2120                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
 2121                         if (V_ip6_use_deprecated)
 2122                                 dep[0] = (struct in6_ifaddr *)ifa;
 2123                         continue;
 2124                 }
 2125 
 2126                 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
 2127                         /*
 2128                          * call in6_matchlen() as few as possible
 2129                          */
 2130                         if (besta) {
 2131                                 if (blen == -1)
 2132                                         blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
 2133                                 tlen = in6_matchlen(IFA_IN6(ifa), dst);
 2134                                 if (tlen > blen) {
 2135                                         blen = tlen;
 2136                                         besta = (struct in6_ifaddr *)ifa;
 2137                                 }
 2138                         } else
 2139                                 besta = (struct in6_ifaddr *)ifa;
 2140                 }
 2141         }
 2142         if (besta) {
 2143                 ifa_ref(&besta->ia_ifa);
 2144                 IF_ADDR_UNLOCK(ifp);
 2145                 return (besta);
 2146         }
 2147 
 2148         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 2149                 if (ifa->ifa_addr->sa_family != AF_INET6)
 2150                         continue;
 2151                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
 2152                         continue; /* XXX: is there any case to allow anycast? */
 2153                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
 2154                         continue; /* don't use this interface */
 2155                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
 2156                         continue;
 2157                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
 2158                         if (V_ip6_use_deprecated)
 2159                                 dep[1] = (struct in6_ifaddr *)ifa;
 2160                         continue;
 2161                 }
 2162 
 2163                 if (ifa != NULL)
 2164                         ifa_ref(ifa);
 2165                 IF_ADDR_UNLOCK(ifp);
 2166                 return (struct in6_ifaddr *)ifa;
 2167         }
 2168 
 2169         /* use the last-resort values, that are, deprecated addresses */
 2170         if (dep[0]) {
 2171                 ifa_ref((struct ifaddr *)dep[0]);
 2172                 IF_ADDR_UNLOCK(ifp);
 2173                 return dep[0];
 2174         }
 2175         if (dep[1]) {
 2176                 ifa_ref((struct ifaddr *)dep[1]);
 2177                 IF_ADDR_UNLOCK(ifp);
 2178                 return dep[1];
 2179         }
 2180 
 2181         IF_ADDR_UNLOCK(ifp);
 2182         return NULL;
 2183 }
 2184 
 2185 /*
 2186  * perform DAD when interface becomes IFF_UP.
 2187  */
 2188 void
 2189 in6_if_up(struct ifnet *ifp)
 2190 {
 2191         struct ifaddr *ifa;
 2192         struct in6_ifaddr *ia;
 2193 
 2194         IF_ADDR_LOCK(ifp);
 2195         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 2196                 if (ifa->ifa_addr->sa_family != AF_INET6)
 2197                         continue;
 2198                 ia = (struct in6_ifaddr *)ifa;
 2199                 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
 2200                         /*
 2201                          * The TENTATIVE flag was likely set by hand
 2202                          * beforehand, implicitly indicating the need for DAD.
 2203                          * We may be able to skip the random delay in this
 2204                          * case, but we impose delays just in case.
 2205                          */
 2206                         nd6_dad_start(ifa,
 2207                             arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
 2208                 }
 2209         }
 2210         IF_ADDR_UNLOCK(ifp);
 2211 
 2212         /*
 2213          * special cases, like 6to4, are handled in in6_ifattach
 2214          */
 2215         in6_ifattach(ifp, NULL);
 2216 }
 2217 
 2218 int
 2219 in6if_do_dad(struct ifnet *ifp)
 2220 {
 2221         if ((ifp->if_flags & IFF_LOOPBACK) != 0)
 2222                 return (0);
 2223 
 2224         switch (ifp->if_type) {
 2225 #ifdef IFT_DUMMY
 2226         case IFT_DUMMY:
 2227 #endif
 2228         case IFT_FAITH:
 2229                 /*
 2230                  * These interfaces do not have the IFF_LOOPBACK flag,
 2231                  * but loop packets back.  We do not have to do DAD on such
 2232                  * interfaces.  We should even omit it, because loop-backed
 2233                  * NS would confuse the DAD procedure.
 2234                  */
 2235                 return (0);
 2236         default:
 2237                 /*
 2238                  * Our DAD routine requires the interface up and running.
 2239                  * However, some interfaces can be up before the RUNNING
 2240                  * status.  Additionaly, users may try to assign addresses
 2241                  * before the interface becomes up (or running).
 2242                  * We simply skip DAD in such a case as a work around.
 2243                  * XXX: we should rather mark "tentative" on such addresses,
 2244                  * and do DAD after the interface becomes ready.
 2245                  */
 2246                 if (!((ifp->if_flags & IFF_UP) &&
 2247                     (ifp->if_drv_flags & IFF_DRV_RUNNING)))
 2248                         return (0);
 2249 
 2250                 return (1);
 2251         }
 2252 }
 2253 
 2254 /*
 2255  * Calculate max IPv6 MTU through all the interfaces and store it
 2256  * to in6_maxmtu.
 2257  */
 2258 void
 2259 in6_setmaxmtu(void)
 2260 {
 2261         unsigned long maxmtu = 0;
 2262         struct ifnet *ifp;
 2263 
 2264         IFNET_RLOCK_NOSLEEP();
 2265         for (ifp = TAILQ_FIRST(&V_ifnet); ifp;
 2266             ifp = TAILQ_NEXT(ifp, if_list)) {
 2267                 /* this function can be called during ifnet initialization */
 2268                 if (!ifp->if_afdata[AF_INET6])
 2269                         continue;
 2270                 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
 2271                     IN6_LINKMTU(ifp) > maxmtu)
 2272                         maxmtu = IN6_LINKMTU(ifp);
 2273         }
 2274         IFNET_RUNLOCK_NOSLEEP();
 2275         if (maxmtu)          /* update only when maxmtu is positive */
 2276                 V_in6_maxmtu = maxmtu;
 2277 }
 2278 
 2279 /*
 2280  * Provide the length of interface identifiers to be used for the link attached
 2281  * to the given interface.  The length should be defined in "IPv6 over
 2282  * xxx-link" document.  Note that address architecture might also define
 2283  * the length for a particular set of address prefixes, regardless of the
 2284  * link type.  As clarified in rfc2462bis, those two definitions should be
 2285  * consistent, and those really are as of August 2004.
 2286  */
 2287 int
 2288 in6_if2idlen(struct ifnet *ifp)
 2289 {
 2290         switch (ifp->if_type) {
 2291         case IFT_ETHER:         /* RFC2464 */
 2292 #ifdef IFT_PROPVIRTUAL
 2293         case IFT_PROPVIRTUAL:   /* XXX: no RFC. treat it as ether */
 2294 #endif
 2295 #ifdef IFT_L2VLAN
 2296         case IFT_L2VLAN:        /* ditto */
 2297 #endif
 2298 #ifdef IFT_IEEE80211
 2299         case IFT_IEEE80211:     /* ditto */
 2300 #endif
 2301 #ifdef IFT_MIP
 2302         case IFT_MIP:   /* ditto */
 2303 #endif
 2304                 return (64);
 2305         case IFT_FDDI:          /* RFC2467 */
 2306                 return (64);
 2307         case IFT_ISO88025:      /* RFC2470 (IPv6 over Token Ring) */
 2308                 return (64);
 2309         case IFT_PPP:           /* RFC2472 */
 2310                 return (64);
 2311         case IFT_ARCNET:        /* RFC2497 */
 2312                 return (64);
 2313         case IFT_FRELAY:        /* RFC2590 */
 2314                 return (64);
 2315         case IFT_IEEE1394:      /* RFC3146 */
 2316                 return (64);
 2317         case IFT_GIF:
 2318                 return (64);    /* draft-ietf-v6ops-mech-v2-07 */
 2319         case IFT_LOOP:
 2320                 return (64);    /* XXX: is this really correct? */
 2321         default:
 2322                 /*
 2323                  * Unknown link type:
 2324                  * It might be controversial to use the today's common constant
 2325                  * of 64 for these cases unconditionally.  For full compliance,
 2326                  * we should return an error in this case.  On the other hand,
 2327                  * if we simply miss the standard for the link type or a new
 2328                  * standard is defined for a new link type, the IFID length
 2329                  * is very likely to be the common constant.  As a compromise,
 2330                  * we always use the constant, but make an explicit notice
 2331                  * indicating the "unknown" case.
 2332                  */
 2333                 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
 2334                 return (64);
 2335         }
 2336 }
 2337 
 2338 #include <sys/sysctl.h>
 2339 
 2340 struct in6_llentry {
 2341         struct llentry          base;
 2342         struct sockaddr_in6     l3_addr6;
 2343 };
 2344 
 2345 static struct llentry *
 2346 in6_lltable_new(const struct sockaddr *l3addr, u_int flags)
 2347 {
 2348         struct in6_llentry *lle;
 2349 
 2350         lle = malloc(sizeof(struct in6_llentry), M_LLTABLE,
 2351             M_DONTWAIT | M_ZERO);
 2352         if (lle == NULL)                /* NB: caller generates msg */
 2353                 return NULL;
 2354 
 2355         lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr;
 2356         lle->base.lle_refcnt = 1;
 2357         LLE_LOCK_INIT(&lle->base);
 2358         callout_init_rw(&lle->base.ln_timer_ch, &lle->base.lle_lock,
 2359             CALLOUT_RETURNUNLOCKED);
 2360 
 2361         return &lle->base;
 2362 }
 2363 
 2364 /*
 2365  * Deletes an address from the address table.
 2366  * This function is called by the timer functions
 2367  * such as arptimer() and nd6_llinfo_timer(), and
 2368  * the caller does the locking.
 2369  */
 2370 static void
 2371 in6_lltable_free(struct lltable *llt, struct llentry *lle)
 2372 {
 2373         LLE_WUNLOCK(lle);
 2374         LLE_LOCK_DESTROY(lle);
 2375         free(lle, M_LLTABLE);
 2376 }
 2377 
 2378 static void
 2379 in6_lltable_prefix_free(struct lltable *llt, 
 2380                         const struct sockaddr *prefix,
 2381                         const struct sockaddr *mask,
 2382                         u_int flags)
 2383 {
 2384         const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix;
 2385         const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask;
 2386         struct llentry *lle, *next;
 2387         register int i;
 2388 
 2389         /*
 2390          * (flags & LLE_STATIC) means deleting all entries 
 2391          * including static ND6 entries
 2392          */
 2393         for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
 2394                 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
 2395                         if (IN6_ARE_MASKED_ADDR_EQUAL(
 2396                                     &((struct sockaddr_in6 *)L3_ADDR(lle))->sin6_addr, 
 2397                                     &pfx->sin6_addr, 
 2398                                     &msk->sin6_addr) &&
 2399                             ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) {
 2400                                 int canceled;
 2401 
 2402                                 canceled = callout_drain(&lle->la_timer);
 2403                                 LLE_WLOCK(lle);
 2404                                 if (canceled)
 2405                                         LLE_REMREF(lle);
 2406                                 llentry_free(lle);
 2407                         }
 2408                 }
 2409         }
 2410 }
 2411 
 2412 static int
 2413 in6_lltable_rtcheck(struct ifnet *ifp, 
 2414                     u_int flags, 
 2415                     const struct sockaddr *l3addr)
 2416 {
 2417         struct rtentry *rt;
 2418         char ip6buf[INET6_ADDRSTRLEN];
 2419 
 2420         KASSERT(l3addr->sa_family == AF_INET6,
 2421             ("sin_family %d", l3addr->sa_family));
 2422 
 2423         /* XXX rtalloc1 should take a const param */
 2424         rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0);
 2425         if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
 2426                 struct ifaddr *ifa;
 2427                 /* 
 2428                  * Create an ND6 cache for an IPv6 neighbor 
 2429                  * that is not covered by our own prefix.
 2430                  */
 2431                 /* XXX ifaof_ifpforaddr should take a const param */
 2432                 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp);
 2433                 if (ifa != NULL) {
 2434                         ifa_free(ifa);
 2435                         if (rt != NULL)
 2436                                 RTFREE_LOCKED(rt);
 2437                         return 0;
 2438                 }
 2439                 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
 2440                     ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr));
 2441                 if (rt != NULL)
 2442                         RTFREE_LOCKED(rt);
 2443                 return EINVAL;
 2444         }
 2445         RTFREE_LOCKED(rt);
 2446         return 0;
 2447 }
 2448 
 2449 static struct llentry *
 2450 in6_lltable_lookup(struct lltable *llt, u_int flags,
 2451         const struct sockaddr *l3addr)
 2452 {
 2453         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
 2454         struct ifnet *ifp = llt->llt_ifp;
 2455         struct llentry *lle;
 2456         struct llentries *lleh;
 2457         u_int hashkey;
 2458 
 2459         IF_AFDATA_LOCK_ASSERT(ifp);
 2460         KASSERT(l3addr->sa_family == AF_INET6,
 2461             ("sin_family %d", l3addr->sa_family));
 2462 
 2463         hashkey = sin6->sin6_addr.s6_addr32[3];
 2464         lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
 2465         LIST_FOREACH(lle, lleh, lle_next) {
 2466                 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle);
 2467                 if (lle->la_flags & LLE_DELETED)
 2468                         continue;
 2469                 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr, 
 2470                          sizeof(struct in6_addr)) == 0)
 2471                         break;
 2472         }
 2473 
 2474         if (lle == NULL) {
 2475                 if (!(flags & LLE_CREATE))
 2476                         return (NULL);
 2477                 /*
 2478                  * A route that covers the given address must have
 2479                  * been installed 1st because we are doing a resolution,
 2480                  * verify this.
 2481                  */
 2482                 if (!(flags & LLE_IFADDR) &&
 2483                     in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
 2484                         return NULL;
 2485 
 2486                 lle = in6_lltable_new(l3addr, flags);
 2487                 if (lle == NULL) {
 2488                         log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
 2489                         return NULL;
 2490                 }
 2491                 lle->la_flags = flags & ~LLE_CREATE;
 2492                 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
 2493                         bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
 2494                         lle->la_flags |= (LLE_VALID | LLE_STATIC);
 2495                 }
 2496 
 2497                 lle->lle_tbl  = llt;
 2498                 lle->lle_head = lleh;
 2499                 LIST_INSERT_HEAD(lleh, lle, lle_next);
 2500         } else if (flags & LLE_DELETE) {
 2501                 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
 2502                         LLE_WLOCK(lle);
 2503                         lle->la_flags = LLE_DELETED;
 2504                         LLE_WUNLOCK(lle);
 2505 #ifdef DIAGNOSTIC
 2506                         log(LOG_INFO, "ifaddr cache = %p  is deleted\n", lle);  
 2507 #endif  
 2508                 }
 2509                 lle = (void *)-1;
 2510         }
 2511         if (LLE_IS_VALID(lle)) {
 2512                 if (flags & LLE_EXCLUSIVE)
 2513                         LLE_WLOCK(lle);
 2514                 else
 2515                         LLE_RLOCK(lle);
 2516         }
 2517         return (lle);
 2518 }
 2519 
 2520 static int
 2521 in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
 2522 {
 2523         struct ifnet *ifp = llt->llt_ifp;
 2524         struct llentry *lle;
 2525         /* XXX stack use */
 2526         struct {
 2527                 struct rt_msghdr        rtm;
 2528                 struct sockaddr_in6     sin6;
 2529                 /*
 2530                  * ndp.c assumes that sdl is word aligned
 2531                  */
 2532 #ifdef __LP64__
 2533                 uint32_t                pad;
 2534 #endif
 2535                 struct sockaddr_dl      sdl;
 2536         } ndpc;
 2537         int i, error;
 2538 
 2539         if (ifp->if_flags & IFF_LOOPBACK)
 2540                 return 0;
 2541 
 2542         LLTABLE_LOCK_ASSERT();
 2543 
 2544         error = 0;
 2545         for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
 2546                 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
 2547                         struct sockaddr_dl *sdl;
 2548 
 2549                         /* skip deleted or invalid entries */
 2550                         if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID)
 2551                                 continue;
 2552                         /* Skip if jailed and not a valid IP of the prison. */
 2553                         if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
 2554                                 continue;
 2555                         /*
 2556                          * produce a msg made of:
 2557                          *  struct rt_msghdr;
 2558                          *  struct sockaddr_in6 (IPv6)
 2559                          *  struct sockaddr_dl;
 2560                          */
 2561                         bzero(&ndpc, sizeof(ndpc));
 2562                         ndpc.rtm.rtm_msglen = sizeof(ndpc);
 2563                         ndpc.rtm.rtm_version = RTM_VERSION;
 2564                         ndpc.rtm.rtm_type = RTM_GET;
 2565                         ndpc.rtm.rtm_flags = RTF_UP;
 2566                         ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
 2567                         ndpc.sin6.sin6_family = AF_INET6;
 2568                         ndpc.sin6.sin6_len = sizeof(ndpc.sin6);
 2569                         bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle));
 2570 
 2571                         /* publish */
 2572                         if (lle->la_flags & LLE_PUB)
 2573                                 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
 2574 
 2575                         sdl = &ndpc.sdl;
 2576                         sdl->sdl_family = AF_LINK;
 2577                         sdl->sdl_len = sizeof(*sdl);
 2578                         sdl->sdl_alen = ifp->if_addrlen;
 2579                         sdl->sdl_index = ifp->if_index;
 2580                         sdl->sdl_type = ifp->if_type;
 2581                         bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
 2582                         ndpc.rtm.rtm_rmx.rmx_expire =
 2583                             lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
 2584                         ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
 2585                         if (lle->la_flags & LLE_STATIC)
 2586                                 ndpc.rtm.rtm_flags |= RTF_STATIC;
 2587                         ndpc.rtm.rtm_index = ifp->if_index;
 2588                         error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
 2589                         if (error)
 2590                                 break;
 2591                 }
 2592         }
 2593         return error;
 2594 }
 2595 
 2596 void *
 2597 in6_domifattach(struct ifnet *ifp)
 2598 {
 2599         struct in6_ifextra *ext;
 2600 
 2601         ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
 2602         bzero(ext, sizeof(*ext));
 2603 
 2604         ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat),
 2605             M_IFADDR, M_WAITOK);
 2606         bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
 2607 
 2608         ext->icmp6_ifstat =
 2609             (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat),
 2610             M_IFADDR, M_WAITOK);
 2611         bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
 2612 
 2613         ext->nd_ifinfo = nd6_ifattach(ifp);
 2614         ext->scope6_id = scope6_ifattach(ifp);
 2615         ext->lltable = lltable_init(ifp, AF_INET6);
 2616         if (ext->lltable != NULL) {
 2617                 ext->lltable->llt_free = in6_lltable_free;
 2618                 ext->lltable->llt_prefix_free = in6_lltable_prefix_free;
 2619                 ext->lltable->llt_lookup = in6_lltable_lookup;
 2620                 ext->lltable->llt_dump = in6_lltable_dump;
 2621         }
 2622 
 2623         ext->mld_ifinfo = mld_domifattach(ifp);
 2624 
 2625         return ext;
 2626 }
 2627 
 2628 void
 2629 in6_domifdetach(struct ifnet *ifp, void *aux)
 2630 {
 2631         struct in6_ifextra *ext = (struct in6_ifextra *)aux;
 2632 
 2633         mld_domifdetach(ifp);
 2634         scope6_ifdetach(ext->scope6_id);
 2635         nd6_ifdetach(ext->nd_ifinfo);
 2636         lltable_free(ext->lltable);
 2637         free(ext->in6_ifstat, M_IFADDR);
 2638         free(ext->icmp6_ifstat, M_IFADDR);
 2639         free(ext, M_IFADDR);
 2640 }
 2641 
 2642 /*
 2643  * Convert sockaddr_in6 to sockaddr_in.  Original sockaddr_in6 must be
 2644  * v4 mapped addr or v4 compat addr
 2645  */
 2646 void
 2647 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
 2648 {
 2649 
 2650         bzero(sin, sizeof(*sin));
 2651         sin->sin_len = sizeof(struct sockaddr_in);
 2652         sin->sin_family = AF_INET;
 2653         sin->sin_port = sin6->sin6_port;
 2654         sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
 2655 }
 2656 
 2657 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
 2658 void
 2659 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
 2660 {
 2661         bzero(sin6, sizeof(*sin6));
 2662         sin6->sin6_len = sizeof(struct sockaddr_in6);
 2663         sin6->sin6_family = AF_INET6;
 2664         sin6->sin6_port = sin->sin_port;
 2665         sin6->sin6_addr.s6_addr32[0] = 0;
 2666         sin6->sin6_addr.s6_addr32[1] = 0;
 2667         sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
 2668         sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
 2669 }
 2670 
 2671 /* Convert sockaddr_in6 into sockaddr_in. */
 2672 void
 2673 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
 2674 {
 2675         struct sockaddr_in *sin_p;
 2676         struct sockaddr_in6 sin6;
 2677 
 2678         /*
 2679          * Save original sockaddr_in6 addr and convert it
 2680          * to sockaddr_in.
 2681          */
 2682         sin6 = *(struct sockaddr_in6 *)nam;
 2683         sin_p = (struct sockaddr_in *)nam;
 2684         in6_sin6_2_sin(sin_p, &sin6);
 2685 }
 2686 
 2687 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
 2688 void
 2689 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
 2690 {
 2691         struct sockaddr_in *sin_p;
 2692         struct sockaddr_in6 *sin6_p;
 2693 
 2694         sin6_p = malloc(sizeof *sin6_p, M_SONAME,
 2695                M_WAITOK);
 2696         sin_p = (struct sockaddr_in *)*nam;
 2697         in6_sin_2_v4mapsin6(sin_p, sin6_p);
 2698         free(*nam, M_SONAME);
 2699         *nam = (struct sockaddr *)sin6_p;
 2700 }

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