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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/8.1/sys/netinet6/in6.c 207914 2010-05-11 11:53:10Z kib $");
   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         default:
  343                 sa6 = NULL;
  344                 break;
  345         }
  346         if (sa6 && sa6->sin6_family == AF_INET6) {
  347                 if (sa6->sin6_scope_id != 0)
  348                         error = sa6_embedscope(sa6, 0);
  349                 else
  350                         error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
  351                 if (error != 0)
  352                         return (error);
  353                 if (td != NULL && (error = prison_check_ip6(td->td_ucred,
  354                     &sa6->sin6_addr)) != 0)
  355                         return (error);
  356                 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
  357         } else
  358                 ia = NULL;
  359 
  360         switch (cmd) {
  361         case SIOCSIFADDR_IN6:
  362         case SIOCSIFDSTADDR_IN6:
  363         case SIOCSIFNETMASK_IN6:
  364                 /*
  365                  * Since IPv6 allows a node to assign multiple addresses
  366                  * on a single interface, SIOCSIFxxx ioctls are deprecated.
  367                  */
  368                 /* we decided to obsolete this command (20000704) */
  369                 error = EINVAL;
  370                 goto out;
  371 
  372         case SIOCDIFADDR_IN6:
  373                 /*
  374                  * for IPv4, we look for existing in_ifaddr here to allow
  375                  * "ifconfig if0 delete" to remove the first IPv4 address on
  376                  * the interface.  For IPv6, as the spec allows multiple
  377                  * interface address from the day one, we consider "remove the
  378                  * first one" semantics to be not preferable.
  379                  */
  380                 if (ia == NULL) {
  381                         error = EADDRNOTAVAIL;
  382                         goto out;
  383                 }
  384                 /* FALLTHROUGH */
  385         case SIOCAIFADDR_IN6:
  386                 /*
  387                  * We always require users to specify a valid IPv6 address for
  388                  * the corresponding operation.
  389                  */
  390                 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
  391                     ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
  392                         error = EAFNOSUPPORT;
  393                         goto out;
  394                 }
  395 
  396                 if (td != NULL) {
  397                         error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 
  398                             PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
  399                         if (error)
  400                                 goto out;
  401                 }
  402                 break;
  403 
  404         case SIOCGIFADDR_IN6:
  405                 /* This interface is basically deprecated. use SIOCGIFCONF. */
  406                 /* FALLTHROUGH */
  407         case SIOCGIFAFLAG_IN6:
  408         case SIOCGIFNETMASK_IN6:
  409         case SIOCGIFDSTADDR_IN6:
  410         case SIOCGIFALIFETIME_IN6:
  411                 /* must think again about its semantics */
  412                 if (ia == NULL) {
  413                         error = EADDRNOTAVAIL;
  414                         goto out;
  415                 }
  416                 break;
  417 
  418         case SIOCSIFALIFETIME_IN6:
  419             {
  420                 struct in6_addrlifetime *lt;
  421 
  422                 if (td != NULL) {
  423                         error = priv_check(td, PRIV_NETINET_ALIFETIME6);
  424                         if (error)
  425                                 goto out;
  426                 }
  427                 if (ia == NULL) {
  428                         error = EADDRNOTAVAIL;
  429                         goto out;
  430                 }
  431                 /* sanity for overflow - beware unsigned */
  432                 lt = &ifr->ifr_ifru.ifru_lifetime;
  433                 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
  434                     lt->ia6t_vltime + time_second < time_second) {
  435                         error = EINVAL;
  436                         goto out;
  437                 }
  438                 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
  439                     lt->ia6t_pltime + time_second < time_second) {
  440                         error = EINVAL;
  441                         goto out;
  442                 }
  443                 break;
  444             }
  445         }
  446 
  447         switch (cmd) {
  448         case SIOCGIFADDR_IN6:
  449                 ifr->ifr_addr = ia->ia_addr;
  450                 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
  451                         goto out;
  452                 break;
  453 
  454         case SIOCGIFDSTADDR_IN6:
  455                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
  456                         error = EINVAL;
  457                         goto out;
  458                 }
  459                 /*
  460                  * XXX: should we check if ifa_dstaddr is NULL and return
  461                  * an error?
  462                  */
  463                 ifr->ifr_dstaddr = ia->ia_dstaddr;
  464                 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
  465                         goto out;
  466                 break;
  467 
  468         case SIOCGIFNETMASK_IN6:
  469                 ifr->ifr_addr = ia->ia_prefixmask;
  470                 break;
  471 
  472         case SIOCGIFAFLAG_IN6:
  473                 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
  474                 break;
  475 
  476         case SIOCGIFSTAT_IN6:
  477                 if (ifp == NULL) {
  478                         error = EINVAL;
  479                         goto out;
  480                 }
  481                 bzero(&ifr->ifr_ifru.ifru_stat,
  482                     sizeof(ifr->ifr_ifru.ifru_stat));
  483                 ifr->ifr_ifru.ifru_stat =
  484                     *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat;
  485                 break;
  486 
  487         case SIOCGIFSTAT_ICMP6:
  488                 if (ifp == NULL) {
  489                         error = EINVAL;
  490                         goto out;
  491                 }
  492                 bzero(&ifr->ifr_ifru.ifru_icmp6stat,
  493                     sizeof(ifr->ifr_ifru.ifru_icmp6stat));
  494                 ifr->ifr_ifru.ifru_icmp6stat =
  495                     *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
  496                 break;
  497 
  498         case SIOCGIFALIFETIME_IN6:
  499                 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
  500                 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
  501                         time_t maxexpire;
  502                         struct in6_addrlifetime *retlt =
  503                             &ifr->ifr_ifru.ifru_lifetime;
  504 
  505                         /*
  506                          * XXX: adjust expiration time assuming time_t is
  507                          * signed.
  508                          */
  509                         maxexpire = (-1) &
  510                             ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
  511                         if (ia->ia6_lifetime.ia6t_vltime <
  512                             maxexpire - ia->ia6_updatetime) {
  513                                 retlt->ia6t_expire = ia->ia6_updatetime +
  514                                     ia->ia6_lifetime.ia6t_vltime;
  515                         } else
  516                                 retlt->ia6t_expire = maxexpire;
  517                 }
  518                 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
  519                         time_t maxexpire;
  520                         struct in6_addrlifetime *retlt =
  521                             &ifr->ifr_ifru.ifru_lifetime;
  522 
  523                         /*
  524                          * XXX: adjust expiration time assuming time_t is
  525                          * signed.
  526                          */
  527                         maxexpire = (-1) &
  528                             ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
  529                         if (ia->ia6_lifetime.ia6t_pltime <
  530                             maxexpire - ia->ia6_updatetime) {
  531                                 retlt->ia6t_preferred = ia->ia6_updatetime +
  532                                     ia->ia6_lifetime.ia6t_pltime;
  533                         } else
  534                                 retlt->ia6t_preferred = maxexpire;
  535                 }
  536                 break;
  537 
  538         case SIOCSIFALIFETIME_IN6:
  539                 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
  540                 /* for sanity */
  541                 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
  542                         ia->ia6_lifetime.ia6t_expire =
  543                                 time_second + ia->ia6_lifetime.ia6t_vltime;
  544                 } else
  545                         ia->ia6_lifetime.ia6t_expire = 0;
  546                 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
  547                         ia->ia6_lifetime.ia6t_preferred =
  548                                 time_second + ia->ia6_lifetime.ia6t_pltime;
  549                 } else
  550                         ia->ia6_lifetime.ia6t_preferred = 0;
  551                 break;
  552 
  553         case SIOCAIFADDR_IN6:
  554         {
  555                 int i;
  556                 struct nd_prefixctl pr0;
  557                 struct nd_prefix *pr;
  558 
  559                 /*
  560                  * first, make or update the interface address structure,
  561                  * and link it to the list.
  562                  */
  563                 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
  564                         goto out;
  565                 if (ia != NULL)
  566                         ifa_free(&ia->ia_ifa);
  567                 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
  568                     == NULL) {
  569                         /*
  570                          * this can happen when the user specify the 0 valid
  571                          * lifetime.
  572                          */
  573                         break;
  574                 }
  575 
  576                 /*
  577                  * then, make the prefix on-link on the interface.
  578                  * XXX: we'd rather create the prefix before the address, but
  579                  * we need at least one address to install the corresponding
  580                  * interface route, so we configure the address first.
  581                  */
  582 
  583                 /*
  584                  * convert mask to prefix length (prefixmask has already
  585                  * been validated in in6_update_ifa().
  586                  */
  587                 bzero(&pr0, sizeof(pr0));
  588                 pr0.ndpr_ifp = ifp;
  589                 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
  590                     NULL);
  591                 if (pr0.ndpr_plen == 128) {
  592                         break;  /* we don't need to install a host route. */
  593                 }
  594                 pr0.ndpr_prefix = ifra->ifra_addr;
  595                 /* apply the mask for safety. */
  596                 for (i = 0; i < 4; i++) {
  597                         pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
  598                             ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
  599                 }
  600                 /*
  601                  * XXX: since we don't have an API to set prefix (not address)
  602                  * lifetimes, we just use the same lifetimes as addresses.
  603                  * The (temporarily) installed lifetimes can be overridden by
  604                  * later advertised RAs (when accept_rtadv is non 0), which is
  605                  * an intended behavior.
  606                  */
  607                 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
  608                 pr0.ndpr_raf_auto =
  609                     ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
  610                 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
  611                 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
  612 
  613                 /* add the prefix if not yet. */
  614                 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
  615                         /*
  616                          * nd6_prelist_add will install the corresponding
  617                          * interface route.
  618                          */
  619                         if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
  620                                 goto out;
  621                         if (pr == NULL) {
  622                                 log(LOG_ERR, "nd6_prelist_add succeeded but "
  623                                     "no prefix\n");
  624                                 error = EINVAL;
  625                                 goto out;
  626                         }
  627                 }
  628 
  629                 /* relate the address to the prefix */
  630                 if (ia->ia6_ndpr == NULL) {
  631                         ia->ia6_ndpr = pr;
  632                         pr->ndpr_refcnt++;
  633 
  634                         /*
  635                          * If this is the first autoconf address from the
  636                          * prefix, create a temporary address as well
  637                          * (when required).
  638                          */
  639                         if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
  640                             V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
  641                                 int e;
  642                                 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
  643                                         log(LOG_NOTICE, "in6_control: failed "
  644                                             "to create a temporary address, "
  645                                             "errno=%d\n", e);
  646                                 }
  647                         }
  648                 }
  649 
  650                 /*
  651                  * this might affect the status of autoconfigured addresses,
  652                  * that is, this address might make other addresses detached.
  653                  */
  654                 pfxlist_onlink_check();
  655                 if (error == 0 && ia)
  656                         EVENTHANDLER_INVOKE(ifaddr_event, ifp);
  657                 break;
  658         }
  659 
  660         case SIOCDIFADDR_IN6:
  661         {
  662                 struct nd_prefix *pr;
  663 
  664                 /*
  665                  * If the address being deleted is the only one that owns
  666                  * the corresponding prefix, expire the prefix as well.
  667                  * XXX: theoretically, we don't have to worry about such
  668                  * relationship, since we separate the address management
  669                  * and the prefix management.  We do this, however, to provide
  670                  * as much backward compatibility as possible in terms of
  671                  * the ioctl operation.
  672                  * Note that in6_purgeaddr() will decrement ndpr_refcnt.
  673                  */
  674                 pr = ia->ia6_ndpr;
  675                 in6_purgeaddr(&ia->ia_ifa);
  676                 if (pr && pr->ndpr_refcnt == 0)
  677                         prelist_remove(pr);
  678                 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
  679                 break;
  680         }
  681 
  682         default:
  683                 if (ifp == NULL || ifp->if_ioctl == 0) {
  684                         error = EOPNOTSUPP;
  685                         goto out;
  686                 }
  687                 error = (*ifp->if_ioctl)(ifp, cmd, data);
  688                 goto out;
  689         }
  690 
  691         error = 0;
  692 out:
  693         if (ia != NULL)
  694                 ifa_free(&ia->ia_ifa);
  695         return (error);
  696 }
  697 
  698 /*
  699  * Update parameters of an IPv6 interface address.
  700  * If necessary, a new entry is created and linked into address chains.
  701  * This function is separated from in6_control().
  702  * XXX: should this be performed under splnet()?
  703  */
  704 int
  705 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
  706     struct in6_ifaddr *ia, int flags)
  707 {
  708         int error = 0, hostIsNew = 0, plen = -1;
  709         struct sockaddr_in6 dst6;
  710         struct in6_addrlifetime *lt;
  711         struct in6_multi_mship *imm;
  712         struct in6_multi *in6m_sol;
  713         struct rtentry *rt;
  714         int delay;
  715         char ip6buf[INET6_ADDRSTRLEN];
  716 
  717         /* Validate parameters */
  718         if (ifp == NULL || ifra == NULL) /* this maybe redundant */
  719                 return (EINVAL);
  720 
  721         /*
  722          * The destination address for a p2p link must have a family
  723          * of AF_UNSPEC or AF_INET6.
  724          */
  725         if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
  726             ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
  727             ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
  728                 return (EAFNOSUPPORT);
  729         /*
  730          * validate ifra_prefixmask.  don't check sin6_family, netmask
  731          * does not carry fields other than sin6_len.
  732          */
  733         if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
  734                 return (EINVAL);
  735         /*
  736          * Because the IPv6 address architecture is classless, we require
  737          * users to specify a (non 0) prefix length (mask) for a new address.
  738          * We also require the prefix (when specified) mask is valid, and thus
  739          * reject a non-consecutive mask.
  740          */
  741         if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
  742                 return (EINVAL);
  743         if (ifra->ifra_prefixmask.sin6_len != 0) {
  744                 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
  745                     (u_char *)&ifra->ifra_prefixmask +
  746                     ifra->ifra_prefixmask.sin6_len);
  747                 if (plen <= 0)
  748                         return (EINVAL);
  749         } else {
  750                 /*
  751                  * In this case, ia must not be NULL.  We just use its prefix
  752                  * length.
  753                  */
  754                 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
  755         }
  756         /*
  757          * If the destination address on a p2p interface is specified,
  758          * and the address is a scoped one, validate/set the scope
  759          * zone identifier.
  760          */
  761         dst6 = ifra->ifra_dstaddr;
  762         if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
  763             (dst6.sin6_family == AF_INET6)) {
  764                 struct in6_addr in6_tmp;
  765                 u_int32_t zoneid;
  766 
  767                 in6_tmp = dst6.sin6_addr;
  768                 if (in6_setscope(&in6_tmp, ifp, &zoneid))
  769                         return (EINVAL); /* XXX: should be impossible */
  770 
  771                 if (dst6.sin6_scope_id != 0) {
  772                         if (dst6.sin6_scope_id != zoneid)
  773                                 return (EINVAL);
  774                 } else          /* user omit to specify the ID. */
  775                         dst6.sin6_scope_id = zoneid;
  776 
  777                 /* convert into the internal form */
  778                 if (sa6_embedscope(&dst6, 0))
  779                         return (EINVAL); /* XXX: should be impossible */
  780         }
  781         /*
  782          * The destination address can be specified only for a p2p or a
  783          * loopback interface.  If specified, the corresponding prefix length
  784          * must be 128.
  785          */
  786         if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
  787                 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
  788                         /* XXX: noisy message */
  789                         nd6log((LOG_INFO, "in6_update_ifa: a destination can "
  790                             "be specified for a p2p or a loopback IF only\n"));
  791                         return (EINVAL);
  792                 }
  793                 if (plen != 128) {
  794                         nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
  795                             "be 128 when dstaddr is specified\n"));
  796                         return (EINVAL);
  797                 }
  798         }
  799         /* lifetime consistency check */
  800         lt = &ifra->ifra_lifetime;
  801         if (lt->ia6t_pltime > lt->ia6t_vltime)
  802                 return (EINVAL);
  803         if (lt->ia6t_vltime == 0) {
  804                 /*
  805                  * the following log might be noisy, but this is a typical
  806                  * configuration mistake or a tool's bug.
  807                  */
  808                 nd6log((LOG_INFO,
  809                     "in6_update_ifa: valid lifetime is 0 for %s\n",
  810                     ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
  811 
  812                 if (ia == NULL)
  813                         return (0); /* there's nothing to do */
  814         }
  815 
  816         /*
  817          * If this is a new address, allocate a new ifaddr and link it
  818          * into chains.
  819          */
  820         if (ia == NULL) {
  821                 hostIsNew = 1;
  822                 /*
  823                  * When in6_update_ifa() is called in a process of a received
  824                  * RA, it is called under an interrupt context.  So, we should
  825                  * call malloc with M_NOWAIT.
  826                  */
  827                 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
  828                     M_NOWAIT);
  829                 if (ia == NULL)
  830                         return (ENOBUFS);
  831                 bzero((caddr_t)ia, sizeof(*ia));
  832                 ifa_init(&ia->ia_ifa);
  833                 LIST_INIT(&ia->ia6_memberships);
  834                 /* Initialize the address and masks, and put time stamp */
  835                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
  836                 ia->ia_addr.sin6_family = AF_INET6;
  837                 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
  838                 ia->ia6_createtime = time_second;
  839                 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
  840                         /*
  841                          * XXX: some functions expect that ifa_dstaddr is not
  842                          * NULL for p2p interfaces.
  843                          */
  844                         ia->ia_ifa.ifa_dstaddr =
  845                             (struct sockaddr *)&ia->ia_dstaddr;
  846                 } else {
  847                         ia->ia_ifa.ifa_dstaddr = NULL;
  848                 }
  849                 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
  850                 ia->ia_ifp = ifp;
  851                 ifa_ref(&ia->ia_ifa);                   /* if_addrhead */
  852                 IF_ADDR_LOCK(ifp);
  853                 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
  854                 IF_ADDR_UNLOCK(ifp);
  855 
  856                 ifa_ref(&ia->ia_ifa);                   /* in6_ifaddrhead */
  857                 IN6_IFADDR_WLOCK();
  858                 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
  859                 IN6_IFADDR_WUNLOCK();
  860         }
  861 
  862         /* update timestamp */
  863         ia->ia6_updatetime = time_second;
  864 
  865         /* set prefix mask */
  866         if (ifra->ifra_prefixmask.sin6_len) {
  867                 /*
  868                  * We prohibit changing the prefix length of an existing
  869                  * address, because
  870                  * + such an operation should be rare in IPv6, and
  871                  * + the operation would confuse prefix management.
  872                  */
  873                 if (ia->ia_prefixmask.sin6_len &&
  874                     in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
  875                         nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
  876                             " existing (%s) address should not be changed\n",
  877                             ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
  878                         error = EINVAL;
  879                         goto unlink;
  880                 }
  881                 ia->ia_prefixmask = ifra->ifra_prefixmask;
  882         }
  883 
  884         /*
  885          * If a new destination address is specified, scrub the old one and
  886          * install the new destination.  Note that the interface must be
  887          * p2p or loopback (see the check above.)
  888          */
  889         if (dst6.sin6_family == AF_INET6 &&
  890             !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
  891                 int e;
  892 
  893                 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
  894                     (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
  895                         nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
  896                             "a route to the old destination: %s\n",
  897                             ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
  898                         /* proceed anyway... */
  899                 } else
  900                         ia->ia_flags &= ~IFA_ROUTE;
  901                 ia->ia_dstaddr = dst6;
  902         }
  903 
  904         /*
  905          * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
  906          * to see if the address is deprecated or invalidated, but initialize
  907          * these members for applications.
  908          */
  909         ia->ia6_lifetime = ifra->ifra_lifetime;
  910         if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
  911                 ia->ia6_lifetime.ia6t_expire =
  912                     time_second + ia->ia6_lifetime.ia6t_vltime;
  913         } else
  914                 ia->ia6_lifetime.ia6t_expire = 0;
  915         if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
  916                 ia->ia6_lifetime.ia6t_preferred =
  917                     time_second + ia->ia6_lifetime.ia6t_pltime;
  918         } else
  919                 ia->ia6_lifetime.ia6t_preferred = 0;
  920 
  921         /* reset the interface and routing table appropriately. */
  922         if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
  923                 goto unlink;
  924 
  925         /*
  926          * configure address flags.
  927          */
  928         ia->ia6_flags = ifra->ifra_flags;
  929         /*
  930          * backward compatibility - if IN6_IFF_DEPRECATED is set from the
  931          * userland, make it deprecated.
  932          */
  933         if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
  934                 ia->ia6_lifetime.ia6t_pltime = 0;
  935                 ia->ia6_lifetime.ia6t_preferred = time_second;
  936         }
  937         /*
  938          * Make the address tentative before joining multicast addresses,
  939          * so that corresponding MLD responses would not have a tentative
  940          * source address.
  941          */
  942         ia->ia6_flags &= ~IN6_IFF_DUPLICATED;   /* safety */
  943         if (hostIsNew && in6if_do_dad(ifp))
  944                 ia->ia6_flags |= IN6_IFF_TENTATIVE;
  945 
  946         /*
  947          * We are done if we have simply modified an existing address.
  948          */
  949         if (!hostIsNew)
  950                 return (error);
  951 
  952         /*
  953          * Beyond this point, we should call in6_purgeaddr upon an error,
  954          * not just go to unlink.
  955          */
  956 
  957         /* Join necessary multicast groups */
  958         in6m_sol = NULL;
  959         if ((ifp->if_flags & IFF_MULTICAST) != 0) {
  960                 struct sockaddr_in6 mltaddr, mltmask;
  961                 struct in6_addr llsol;
  962 
  963                 /* join solicited multicast addr for new host id */
  964                 bzero(&llsol, sizeof(struct in6_addr));
  965                 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
  966                 llsol.s6_addr32[1] = 0;
  967                 llsol.s6_addr32[2] = htonl(1);
  968                 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
  969                 llsol.s6_addr8[12] = 0xff;
  970                 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) {
  971                         /* XXX: should not happen */
  972                         log(LOG_ERR, "in6_update_ifa: "
  973                             "in6_setscope failed\n");
  974                         goto cleanup;
  975                 }
  976                 delay = 0;
  977                 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
  978                         /*
  979                          * We need a random delay for DAD on the address
  980                          * being configured.  It also means delaying
  981                          * transmission of the corresponding MLD report to
  982                          * avoid report collision.
  983                          * [draft-ietf-ipv6-rfc2462bis-02.txt]
  984                          */
  985                         delay = arc4random() %
  986                             (MAX_RTR_SOLICITATION_DELAY * hz);
  987                 }
  988                 imm = in6_joingroup(ifp, &llsol, &error, delay);
  989                 if (imm == NULL) {
  990                         nd6log((LOG_WARNING,
  991                             "in6_update_ifa: addmulti failed for "
  992                             "%s on %s (errno=%d)\n",
  993                             ip6_sprintf(ip6buf, &llsol), if_name(ifp),
  994                             error));
  995                         goto cleanup;
  996                 }
  997                 LIST_INSERT_HEAD(&ia->ia6_memberships,
  998                     imm, i6mm_chain);
  999                 in6m_sol = imm->i6mm_maddr;
 1000 
 1001                 bzero(&mltmask, sizeof(mltmask));
 1002                 mltmask.sin6_len = sizeof(struct sockaddr_in6);
 1003                 mltmask.sin6_family = AF_INET6;
 1004                 mltmask.sin6_addr = in6mask32;
 1005 #define MLTMASK_LEN  4  /* mltmask's masklen (=32bit=4octet) */
 1006 
 1007                 /*
 1008                  * join link-local all-nodes address
 1009                  */
 1010                 bzero(&mltaddr, sizeof(mltaddr));
 1011                 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
 1012                 mltaddr.sin6_family = AF_INET6;
 1013                 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
 1014                 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) !=
 1015                     0)
 1016                         goto cleanup; /* XXX: should not fail */
 1017 
 1018                 /*
 1019                  * XXX: do we really need this automatic routes?
 1020                  * We should probably reconsider this stuff.  Most applications
 1021                  * actually do not need the routes, since they usually specify
 1022                  * the outgoing interface.
 1023                  */
 1024                 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
 1025                 if (rt) {
 1026                         /* XXX: only works in !SCOPEDROUTING case. */
 1027                         if (memcmp(&mltaddr.sin6_addr,
 1028                             &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
 1029                             MLTMASK_LEN)) {
 1030                                 RTFREE_LOCKED(rt);
 1031                                 rt = NULL;
 1032                         }
 1033                 }
 1034                 if (!rt) {
 1035                         error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
 1036                             (struct sockaddr *)&ia->ia_addr,
 1037                             (struct sockaddr *)&mltmask, RTF_UP,
 1038                             (struct rtentry **)0);
 1039                         if (error)
 1040                                 goto cleanup;
 1041                 } else {
 1042                         RTFREE_LOCKED(rt);
 1043                 }
 1044 
 1045                 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
 1046                 if (!imm) {
 1047                         nd6log((LOG_WARNING,
 1048                             "in6_update_ifa: addmulti failed for "
 1049                             "%s on %s (errno=%d)\n",
 1050                             ip6_sprintf(ip6buf, &mltaddr.sin6_addr),
 1051                             if_name(ifp), error));
 1052                         goto cleanup;
 1053                 }
 1054                 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
 1055 
 1056                 /*
 1057                  * join node information group address
 1058                  */
 1059                 delay = 0;
 1060                 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
 1061                         /*
 1062                          * The spec doesn't say anything about delay for this
 1063                          * group, but the same logic should apply.
 1064                          */
 1065                         delay = arc4random() %
 1066                             (MAX_RTR_SOLICITATION_DELAY * hz);
 1067                 }
 1068                 if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) {
 1069                         imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error,
 1070                             delay); /* XXX jinmei */
 1071                         if (!imm) {
 1072                                 nd6log((LOG_WARNING, "in6_update_ifa: "
 1073                                     "addmulti failed for %s on %s "
 1074                                     "(errno=%d)\n",
 1075                                     ip6_sprintf(ip6buf, &mltaddr.sin6_addr),
 1076                                     if_name(ifp), error));
 1077                                 /* XXX not very fatal, go on... */
 1078                         } else {
 1079                                 LIST_INSERT_HEAD(&ia->ia6_memberships,
 1080                                     imm, i6mm_chain);
 1081                         }
 1082                 }
 1083 
 1084                 /*
 1085                  * join interface-local all-nodes address.
 1086                  * (ff01::1%ifN, and ff01::%ifN/32)
 1087                  */
 1088                 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
 1089                 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL))
 1090                     != 0)
 1091                         goto cleanup; /* XXX: should not fail */
 1092                 /* XXX: again, do we really need the route? */
 1093                 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
 1094                 if (rt) {
 1095                         if (memcmp(&mltaddr.sin6_addr,
 1096                             &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
 1097                             MLTMASK_LEN)) {
 1098                                 RTFREE_LOCKED(rt);
 1099                                 rt = NULL;
 1100                         }
 1101                 }
 1102                 if (!rt) {
 1103                         error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
 1104                             (struct sockaddr *)&ia->ia_addr,
 1105                             (struct sockaddr *)&mltmask, RTF_UP,
 1106                             (struct rtentry **)0);
 1107                         if (error)
 1108                                 goto cleanup;
 1109                 } else
 1110                         RTFREE_LOCKED(rt);
 1111 
 1112                 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
 1113                 if (!imm) {
 1114                         nd6log((LOG_WARNING, "in6_update_ifa: "
 1115                             "addmulti failed for %s on %s "
 1116                             "(errno=%d)\n",
 1117                             ip6_sprintf(ip6buf, &mltaddr.sin6_addr),
 1118                             if_name(ifp), error));
 1119                         goto cleanup;
 1120                 }
 1121                 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
 1122 #undef  MLTMASK_LEN
 1123         }
 1124 
 1125         /*
 1126          * Perform DAD, if needed.
 1127          * XXX It may be of use, if we can administratively
 1128          * disable DAD.
 1129          */
 1130         if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
 1131             (ia->ia6_flags & IN6_IFF_TENTATIVE))
 1132         {
 1133                 int mindelay, maxdelay;
 1134 
 1135                 delay = 0;
 1136                 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
 1137                         /*
 1138                          * We need to impose a delay before sending an NS
 1139                          * for DAD.  Check if we also needed a delay for the
 1140                          * corresponding MLD message.  If we did, the delay
 1141                          * should be larger than the MLD delay (this could be
 1142                          * relaxed a bit, but this simple logic is at least
 1143                          * safe).
 1144                          * XXX: Break data hiding guidelines and look at
 1145                          * state for the solicited multicast group.
 1146                          */
 1147                         mindelay = 0;
 1148                         if (in6m_sol != NULL &&
 1149                             in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
 1150                                 mindelay = in6m_sol->in6m_timer;
 1151                         }
 1152                         maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
 1153                         if (maxdelay - mindelay == 0)
 1154                                 delay = 0;
 1155                         else {
 1156                                 delay =
 1157                                     (arc4random() % (maxdelay - mindelay)) +
 1158                                     mindelay;
 1159                         }
 1160                 }
 1161                 nd6_dad_start((struct ifaddr *)ia, delay);
 1162         }
 1163 
 1164         KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew"));
 1165         ifa_free(&ia->ia_ifa);
 1166         return (error);
 1167 
 1168   unlink:
 1169         /*
 1170          * XXX: if a change of an existing address failed, keep the entry
 1171          * anyway.
 1172          */
 1173         if (hostIsNew) {
 1174                 in6_unlink_ifa(ia, ifp);
 1175                 ifa_free(&ia->ia_ifa);
 1176         }
 1177         return (error);
 1178 
 1179   cleanup:
 1180         KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew"));
 1181         ifa_free(&ia->ia_ifa);
 1182         in6_purgeaddr(&ia->ia_ifa);
 1183         return error;
 1184 }
 1185 
 1186 void
 1187 in6_purgeaddr(struct ifaddr *ifa)
 1188 {
 1189         struct ifnet *ifp = ifa->ifa_ifp;
 1190         struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
 1191         struct in6_multi_mship *imm;
 1192         struct sockaddr_in6 mltaddr, mltmask;
 1193         struct rtentry rt0;
 1194         struct sockaddr_dl gateway;
 1195         struct sockaddr_in6 mask, addr;
 1196         int plen, error;
 1197         struct rtentry *rt;
 1198         struct ifaddr *ifa0, *nifa;
 1199 
 1200         /*
 1201          * find another IPv6 address as the gateway for the
 1202          * link-local and node-local all-nodes multicast
 1203          * address routes
 1204          */
 1205         IF_ADDR_LOCK(ifp);
 1206         TAILQ_FOREACH_SAFE(ifa0, &ifp->if_addrhead, ifa_link, nifa) {
 1207                 if ((ifa0->ifa_addr->sa_family != AF_INET6) ||
 1208                     memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr,
 1209                            &ia->ia_addr.sin6_addr, 
 1210                            sizeof(struct in6_addr)) == 0)
 1211                         continue;
 1212                 else
 1213                         break;
 1214         }
 1215         if (ifa0 != NULL)
 1216                 ifa_ref(ifa0);
 1217         IF_ADDR_UNLOCK(ifp);
 1218 
 1219         /*
 1220          * Remove the loopback route to the interface address.
 1221          * The check for the current setting of "nd6_useloopback" 
 1222          * is not needed.
 1223          */
 1224         if (ia->ia_flags & IFA_RTSELF) {
 1225                 error = ifa_del_loopback_route((struct ifaddr *)ia,
 1226                                        (struct sockaddr *)&ia->ia_addr);
 1227                 if (error == 0)
 1228                         ia->ia_flags &= ~IFA_RTSELF;
 1229         }
 1230 
 1231         /* stop DAD processing */
 1232         nd6_dad_stop(ifa);
 1233 
 1234         IF_AFDATA_LOCK(ifp);
 1235         lla_lookup(LLTABLE6(ifp), (LLE_DELETE | LLE_IFADDR),
 1236             (struct sockaddr *)&ia->ia_addr);
 1237         IF_AFDATA_UNLOCK(ifp);
 1238 
 1239         /*
 1240          * initialize for rtmsg generation
 1241          */
 1242         bzero(&gateway, sizeof(gateway));
 1243         gateway.sdl_len = sizeof(gateway);
 1244         gateway.sdl_family = AF_LINK;
 1245         gateway.sdl_nlen = 0;
 1246         gateway.sdl_alen = ifp->if_addrlen;
 1247         /* */
 1248         bzero(&rt0, sizeof(rt0));
 1249         rt0.rt_gateway = (struct sockaddr *)&gateway;
 1250         memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
 1251         memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
 1252         rt_mask(&rt0) = (struct sockaddr *)&mask;
 1253         rt_key(&rt0) = (struct sockaddr *)&addr;
 1254         rt0.rt_flags = RTF_HOST | RTF_STATIC;
 1255         rt_newaddrmsg(RTM_DELETE, ifa, 0, &rt0);
 1256 
 1257         /*
 1258          * leave from multicast groups we have joined for the interface
 1259          */
 1260         while ((imm = ia->ia6_memberships.lh_first) != NULL) {
 1261                 LIST_REMOVE(imm, i6mm_chain);
 1262                 in6_leavegroup(imm);
 1263         }
 1264 
 1265         /*
 1266          * remove the link-local all-nodes address
 1267          */
 1268         bzero(&mltmask, sizeof(mltmask));
 1269         mltmask.sin6_len = sizeof(struct sockaddr_in6);
 1270         mltmask.sin6_family = AF_INET6;
 1271         mltmask.sin6_addr = in6mask32;
 1272 
 1273         bzero(&mltaddr, sizeof(mltaddr));
 1274         mltaddr.sin6_len = sizeof(struct sockaddr_in6);
 1275         mltaddr.sin6_family = AF_INET6;
 1276         mltaddr.sin6_addr = in6addr_linklocal_allnodes;
 1277 
 1278         if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) !=
 1279             0)
 1280                 goto cleanup; 
 1281 
 1282         rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
 1283         if (rt != NULL && rt->rt_gateway != NULL &&
 1284             (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 
 1285                     &ia->ia_addr.sin6_addr,
 1286                     sizeof(ia->ia_addr.sin6_addr)) == 0)) {
 1287                 /* 
 1288                  * if no more IPv6 address exists on this interface
 1289                  * then remove the multicast address route
 1290                  */
 1291                 if (ifa0 == NULL) {
 1292                         memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr, 
 1293                                sizeof(mltaddr.sin6_addr));
 1294                         RTFREE_LOCKED(rt);
 1295                         error = rtrequest(RTM_DELETE, (struct sockaddr *)&mltaddr,
 1296                                           (struct sockaddr *)&ia->ia_addr,
 1297                                           (struct sockaddr *)&mltmask, RTF_UP,
 1298                                           (struct rtentry **)0);
 1299                         if (error)
 1300                                 log(LOG_INFO, "in6_purgeaddr: link-local all-nodes"
 1301                                     "multicast address deletion error\n");
 1302                 } else {
 1303                         /*
 1304                          * replace the gateway of the route
 1305                          */
 1306                         struct sockaddr_in6 sa;
 1307 
 1308                         bzero(&sa, sizeof(sa));
 1309                         sa.sin6_len = sizeof(struct sockaddr_in6);
 1310                         sa.sin6_family = AF_INET6;
 1311                         memcpy(&sa.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 
 1312                                sizeof(sa.sin6_addr));
 1313                         in6_setscope(&sa.sin6_addr, ifa0->ifa_ifp, NULL);
 1314                         memcpy(rt->rt_gateway, &sa, sizeof(sa));
 1315                         RTFREE_LOCKED(rt);
 1316                 }
 1317         } else {
 1318                 if (rt != NULL)
 1319                         RTFREE_LOCKED(rt);
 1320         }
 1321 
 1322         /*
 1323          * remove the node-local all-nodes address
 1324          */
 1325         mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
 1326         if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) !=
 1327             0)
 1328                 goto cleanup;
 1329 
 1330         rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
 1331         if (rt != NULL && rt->rt_gateway != NULL &&
 1332             (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 
 1333                     &ia->ia_addr.sin6_addr,
 1334                     sizeof(ia->ia_addr.sin6_addr)) == 0)) {
 1335                 /* 
 1336                  * if no more IPv6 address exists on this interface
 1337                  * then remove the multicast address route
 1338                  */
 1339                 if (ifa0 == NULL) {
 1340                         memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr, 
 1341                                sizeof(mltaddr.sin6_addr));
 1342 
 1343                         RTFREE_LOCKED(rt);
 1344                         error = rtrequest(RTM_DELETE, (struct sockaddr *)&mltaddr,
 1345                                           (struct sockaddr *)&ia->ia_addr,
 1346                                           (struct sockaddr *)&mltmask, RTF_UP,
 1347                                           (struct rtentry **)0);
 1348 
 1349                         if (error)
 1350                                 log(LOG_INFO, "in6_purgeaddr: node-local all-nodes"
 1351                                     "multicast address deletion error\n");
 1352                 } else {
 1353                         /*
 1354                          * replace the gateway of the route
 1355                          */
 1356                         struct sockaddr_in6 sa;
 1357 
 1358                         bzero(&sa, sizeof(sa));
 1359                         sa.sin6_len = sizeof(struct sockaddr_in6);
 1360                         sa.sin6_family = AF_INET6;
 1361                         memcpy(&sa.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 
 1362                                sizeof(sa.sin6_addr));
 1363                         in6_setscope(&sa.sin6_addr, ifa0->ifa_ifp, NULL);
 1364                         memcpy(rt->rt_gateway, &sa, sizeof(sa));
 1365                         RTFREE_LOCKED(rt);
 1366                 }
 1367         } else {
 1368                 if (rt != NULL)
 1369                         RTFREE_LOCKED(rt);
 1370         }
 1371 
 1372 cleanup:
 1373 
 1374         plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
 1375         if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
 1376                 int error;
 1377                 struct sockaddr *dstaddr;
 1378 
 1379                 /* 
 1380                  * use the interface address if configuring an
 1381                  * interface address with a /128 prefix len
 1382                  */
 1383                 if (ia->ia_dstaddr.sin6_family == AF_INET6)
 1384                         dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
 1385                 else
 1386                         dstaddr = (struct sockaddr *)&ia->ia_addr;
 1387 
 1388                 error = rtrequest(RTM_DELETE,
 1389                     (struct sockaddr *)dstaddr,
 1390                     (struct sockaddr *)&ia->ia_addr,
 1391                     (struct sockaddr *)&ia->ia_prefixmask,
 1392                     ia->ia_flags | RTF_HOST, NULL);
 1393                 if (error != 0)
 1394                         return;
 1395                 ia->ia_flags &= ~IFA_ROUTE;
 1396         }
 1397         if (ifa0 != NULL)
 1398                 ifa_free(ifa0);
 1399 
 1400         in6_unlink_ifa(ia, ifp);
 1401 }
 1402 
 1403 static void
 1404 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
 1405 {
 1406         int     s = splnet();
 1407 
 1408         IF_ADDR_LOCK(ifp);
 1409         TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
 1410         IF_ADDR_UNLOCK(ifp);
 1411         ifa_free(&ia->ia_ifa);                  /* if_addrhead */
 1412 
 1413         /*
 1414          * Defer the release of what might be the last reference to the
 1415          * in6_ifaddr so that it can't be freed before the remainder of the
 1416          * cleanup.
 1417          */
 1418         IN6_IFADDR_WLOCK();
 1419         TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
 1420         IN6_IFADDR_WUNLOCK();
 1421 
 1422         /*
 1423          * Release the reference to the base prefix.  There should be a
 1424          * positive reference.
 1425          */
 1426         if (ia->ia6_ndpr == NULL) {
 1427                 nd6log((LOG_NOTICE,
 1428                     "in6_unlink_ifa: autoconf'ed address "
 1429                     "%p has no prefix\n", ia));
 1430         } else {
 1431                 ia->ia6_ndpr->ndpr_refcnt--;
 1432                 ia->ia6_ndpr = NULL;
 1433         }
 1434 
 1435         /*
 1436          * Also, if the address being removed is autoconf'ed, call
 1437          * pfxlist_onlink_check() since the release might affect the status of
 1438          * other (detached) addresses.
 1439          */
 1440         if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
 1441                 pfxlist_onlink_check();
 1442         }
 1443         ifa_free(&ia->ia_ifa);                  /* in6_ifaddrhead */
 1444         splx(s);
 1445 }
 1446 
 1447 void
 1448 in6_purgeif(struct ifnet *ifp)
 1449 {
 1450         struct ifaddr *ifa, *nifa;
 1451 
 1452         TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
 1453                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1454                         continue;
 1455                 in6_purgeaddr(ifa);
 1456         }
 1457 
 1458         in6_ifdetach(ifp);
 1459 }
 1460 
 1461 /*
 1462  * SIOC[GAD]LIFADDR.
 1463  *      SIOCGLIFADDR: get first address. (?)
 1464  *      SIOCGLIFADDR with IFLR_PREFIX:
 1465  *              get first address that matches the specified prefix.
 1466  *      SIOCALIFADDR: add the specified address.
 1467  *      SIOCALIFADDR with IFLR_PREFIX:
 1468  *              add the specified prefix, filling hostid part from
 1469  *              the first link-local address.  prefixlen must be <= 64.
 1470  *      SIOCDLIFADDR: delete the specified address.
 1471  *      SIOCDLIFADDR with IFLR_PREFIX:
 1472  *              delete the first address that matches the specified prefix.
 1473  * return values:
 1474  *      EINVAL on invalid parameters
 1475  *      EADDRNOTAVAIL on prefix match failed/specified address not found
 1476  *      other values may be returned from in6_ioctl()
 1477  *
 1478  * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
 1479  * this is to accomodate address naming scheme other than RFC2374,
 1480  * in the future.
 1481  * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
 1482  * address encoding scheme. (see figure on page 8)
 1483  */
 1484 static int
 1485 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
 1486     struct ifnet *ifp, struct thread *td)
 1487 {
 1488         struct if_laddrreq *iflr = (struct if_laddrreq *)data;
 1489         struct ifaddr *ifa;
 1490         struct sockaddr *sa;
 1491 
 1492         /* sanity checks */
 1493         if (!data || !ifp) {
 1494                 panic("invalid argument to in6_lifaddr_ioctl");
 1495                 /* NOTREACHED */
 1496         }
 1497 
 1498         switch (cmd) {
 1499         case SIOCGLIFADDR:
 1500                 /* address must be specified on GET with IFLR_PREFIX */
 1501                 if ((iflr->flags & IFLR_PREFIX) == 0)
 1502                         break;
 1503                 /* FALLTHROUGH */
 1504         case SIOCALIFADDR:
 1505         case SIOCDLIFADDR:
 1506                 /* address must be specified on ADD and DELETE */
 1507                 sa = (struct sockaddr *)&iflr->addr;
 1508                 if (sa->sa_family != AF_INET6)
 1509                         return EINVAL;
 1510                 if (sa->sa_len != sizeof(struct sockaddr_in6))
 1511                         return EINVAL;
 1512                 /* XXX need improvement */
 1513                 sa = (struct sockaddr *)&iflr->dstaddr;
 1514                 if (sa->sa_family && sa->sa_family != AF_INET6)
 1515                         return EINVAL;
 1516                 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
 1517                         return EINVAL;
 1518                 break;
 1519         default: /* shouldn't happen */
 1520 #if 0
 1521                 panic("invalid cmd to in6_lifaddr_ioctl");
 1522                 /* NOTREACHED */
 1523 #else
 1524                 return EOPNOTSUPP;
 1525 #endif
 1526         }
 1527         if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
 1528                 return EINVAL;
 1529 
 1530         switch (cmd) {
 1531         case SIOCALIFADDR:
 1532             {
 1533                 struct in6_aliasreq ifra;
 1534                 struct in6_addr *hostid = NULL;
 1535                 int prefixlen;
 1536 
 1537                 ifa = NULL;
 1538                 if ((iflr->flags & IFLR_PREFIX) != 0) {
 1539                         struct sockaddr_in6 *sin6;
 1540 
 1541                         /*
 1542                          * hostid is to fill in the hostid part of the
 1543                          * address.  hostid points to the first link-local
 1544                          * address attached to the interface.
 1545                          */
 1546                         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
 1547                         if (!ifa)
 1548                                 return EADDRNOTAVAIL;
 1549                         hostid = IFA_IN6(ifa);
 1550 
 1551                         /* prefixlen must be <= 64. */
 1552                         if (64 < iflr->prefixlen)
 1553                                 return EINVAL;
 1554                         prefixlen = iflr->prefixlen;
 1555 
 1556                         /* hostid part must be zero. */
 1557                         sin6 = (struct sockaddr_in6 *)&iflr->addr;
 1558                         if (sin6->sin6_addr.s6_addr32[2] != 0 ||
 1559                             sin6->sin6_addr.s6_addr32[3] != 0) {
 1560                                 return EINVAL;
 1561                         }
 1562                 } else
 1563                         prefixlen = iflr->prefixlen;
 1564 
 1565                 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
 1566                 bzero(&ifra, sizeof(ifra));
 1567                 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
 1568 
 1569                 bcopy(&iflr->addr, &ifra.ifra_addr,
 1570                     ((struct sockaddr *)&iflr->addr)->sa_len);
 1571                 if (hostid) {
 1572                         /* fill in hostid part */
 1573                         ifra.ifra_addr.sin6_addr.s6_addr32[2] =
 1574                             hostid->s6_addr32[2];
 1575                         ifra.ifra_addr.sin6_addr.s6_addr32[3] =
 1576                             hostid->s6_addr32[3];
 1577                 }
 1578 
 1579                 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
 1580                         bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
 1581                             ((struct sockaddr *)&iflr->dstaddr)->sa_len);
 1582                         if (hostid) {
 1583                                 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
 1584                                     hostid->s6_addr32[2];
 1585                                 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
 1586                                     hostid->s6_addr32[3];
 1587                         }
 1588                 }
 1589                 if (ifa != NULL)
 1590                         ifa_free(ifa);
 1591 
 1592                 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
 1593                 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
 1594 
 1595                 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
 1596                 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
 1597             }
 1598         case SIOCGLIFADDR:
 1599         case SIOCDLIFADDR:
 1600             {
 1601                 struct in6_ifaddr *ia;
 1602                 struct in6_addr mask, candidate, match;
 1603                 struct sockaddr_in6 *sin6;
 1604                 int cmp;
 1605 
 1606                 bzero(&mask, sizeof(mask));
 1607                 if (iflr->flags & IFLR_PREFIX) {
 1608                         /* lookup a prefix rather than address. */
 1609                         in6_prefixlen2mask(&mask, iflr->prefixlen);
 1610 
 1611                         sin6 = (struct sockaddr_in6 *)&iflr->addr;
 1612                         bcopy(&sin6->sin6_addr, &match, sizeof(match));
 1613                         match.s6_addr32[0] &= mask.s6_addr32[0];
 1614                         match.s6_addr32[1] &= mask.s6_addr32[1];
 1615                         match.s6_addr32[2] &= mask.s6_addr32[2];
 1616                         match.s6_addr32[3] &= mask.s6_addr32[3];
 1617 
 1618                         /* if you set extra bits, that's wrong */
 1619                         if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
 1620                                 return EINVAL;
 1621 
 1622                         cmp = 1;
 1623                 } else {
 1624                         if (cmd == SIOCGLIFADDR) {
 1625                                 /* on getting an address, take the 1st match */
 1626                                 cmp = 0;        /* XXX */
 1627                         } else {
 1628                                 /* on deleting an address, do exact match */
 1629                                 in6_prefixlen2mask(&mask, 128);
 1630                                 sin6 = (struct sockaddr_in6 *)&iflr->addr;
 1631                                 bcopy(&sin6->sin6_addr, &match, sizeof(match));
 1632 
 1633                                 cmp = 1;
 1634                         }
 1635                 }
 1636 
 1637                 IF_ADDR_LOCK(ifp);
 1638                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1639                         if (ifa->ifa_addr->sa_family != AF_INET6)
 1640                                 continue;
 1641                         if (!cmp)
 1642                                 break;
 1643 
 1644                         /*
 1645                          * XXX: this is adhoc, but is necessary to allow
 1646                          * a user to specify fe80::/64 (not /10) for a
 1647                          * link-local address.
 1648                          */
 1649                         bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
 1650                         in6_clearscope(&candidate);
 1651                         candidate.s6_addr32[0] &= mask.s6_addr32[0];
 1652                         candidate.s6_addr32[1] &= mask.s6_addr32[1];
 1653                         candidate.s6_addr32[2] &= mask.s6_addr32[2];
 1654                         candidate.s6_addr32[3] &= mask.s6_addr32[3];
 1655                         if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
 1656                                 break;
 1657                 }
 1658                 IF_ADDR_UNLOCK(ifp);
 1659                 if (!ifa)
 1660                         return EADDRNOTAVAIL;
 1661                 ia = ifa2ia6(ifa);
 1662 
 1663                 if (cmd == SIOCGLIFADDR) {
 1664                         int error;
 1665 
 1666                         /* fill in the if_laddrreq structure */
 1667                         bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
 1668                         error = sa6_recoverscope(
 1669                             (struct sockaddr_in6 *)&iflr->addr);
 1670                         if (error != 0)
 1671                                 return (error);
 1672 
 1673                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 1674                                 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
 1675                                     ia->ia_dstaddr.sin6_len);
 1676                                 error = sa6_recoverscope(
 1677                                     (struct sockaddr_in6 *)&iflr->dstaddr);
 1678                                 if (error != 0)
 1679                                         return (error);
 1680                         } else
 1681                                 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
 1682 
 1683                         iflr->prefixlen =
 1684                             in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
 1685 
 1686                         iflr->flags = ia->ia6_flags;    /* XXX */
 1687 
 1688                         return 0;
 1689                 } else {
 1690                         struct in6_aliasreq ifra;
 1691 
 1692                         /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
 1693                         bzero(&ifra, sizeof(ifra));
 1694                         bcopy(iflr->iflr_name, ifra.ifra_name,
 1695                             sizeof(ifra.ifra_name));
 1696 
 1697                         bcopy(&ia->ia_addr, &ifra.ifra_addr,
 1698                             ia->ia_addr.sin6_len);
 1699                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 1700                                 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
 1701                                     ia->ia_dstaddr.sin6_len);
 1702                         } else {
 1703                                 bzero(&ifra.ifra_dstaddr,
 1704                                     sizeof(ifra.ifra_dstaddr));
 1705                         }
 1706                         bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
 1707                             ia->ia_prefixmask.sin6_len);
 1708 
 1709                         ifra.ifra_flags = ia->ia6_flags;
 1710                         return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
 1711                             ifp, td);
 1712                 }
 1713             }
 1714         }
 1715 
 1716         return EOPNOTSUPP;      /* just for safety */
 1717 }
 1718 
 1719 /*
 1720  * Initialize an interface's intetnet6 address
 1721  * and routing table entry.
 1722  */
 1723 static int
 1724 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
 1725     struct sockaddr_in6 *sin6, int newhost)
 1726 {
 1727         int     error = 0, plen, ifacount = 0;
 1728         int     s = splimp();
 1729         struct ifaddr *ifa;
 1730 
 1731         /*
 1732          * Give the interface a chance to initialize
 1733          * if this is its first address,
 1734          * and to validate the address if necessary.
 1735          */
 1736         IF_ADDR_LOCK(ifp);
 1737         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1738                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1739                         continue;
 1740                 ifacount++;
 1741         }
 1742         IF_ADDR_UNLOCK(ifp);
 1743 
 1744         ia->ia_addr = *sin6;
 1745 
 1746         if (ifacount <= 1 && ifp->if_ioctl) {
 1747                 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
 1748                 if (error) {
 1749                         splx(s);
 1750                         return (error);
 1751                 }
 1752         }
 1753         splx(s);
 1754 
 1755         ia->ia_ifa.ifa_metric = ifp->if_metric;
 1756 
 1757         /* we could do in(6)_socktrim here, but just omit it at this moment. */
 1758 
 1759         /*
 1760          * Special case:
 1761          * If a new destination address is specified for a point-to-point
 1762          * interface, install a route to the destination as an interface
 1763          * direct route. 
 1764          * XXX: the logic below rejects assigning multiple addresses on a p2p
 1765          * interface that share the same destination.
 1766          */
 1767         plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
 1768         if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
 1769             ia->ia_dstaddr.sin6_family == AF_INET6) {
 1770                 int rtflags = RTF_UP | RTF_HOST;
 1771 
 1772                 error = rtrequest(RTM_ADD,
 1773                     (struct sockaddr *)&ia->ia_dstaddr,
 1774                     (struct sockaddr *)&ia->ia_addr,
 1775                     (struct sockaddr *)&ia->ia_prefixmask,
 1776                     ia->ia_flags | rtflags, NULL);
 1777                 if (error != 0)
 1778                         return (error);
 1779                 ia->ia_flags |= IFA_ROUTE;
 1780         }
 1781 
 1782         /*
 1783          * add a loopback route to self
 1784          */
 1785         if (!(ia->ia_flags & IFA_ROUTE)
 1786             && (V_nd6_useloopback
 1787                 || (ifp->if_flags & IFF_LOOPBACK))) {
 1788                 error = ifa_add_loopback_route((struct ifaddr *)ia,
 1789                                        (struct sockaddr *)&ia->ia_addr);
 1790                 if (error == 0)
 1791                         ia->ia_flags |= IFA_RTSELF;
 1792         }
 1793 
 1794         /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */
 1795         if (newhost) {
 1796                 struct llentry *ln;
 1797                 struct rtentry rt;
 1798                 struct sockaddr_dl gateway;
 1799                 struct sockaddr_in6 mask, addr;
 1800 
 1801                 IF_AFDATA_LOCK(ifp);
 1802                 ia->ia_ifa.ifa_rtrequest = NULL;
 1803 
 1804                 /* XXX QL
 1805                  * we need to report rt_newaddrmsg
 1806                  */
 1807                 ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR | LLE_EXCLUSIVE),
 1808                     (struct sockaddr *)&ia->ia_addr);
 1809                 IF_AFDATA_UNLOCK(ifp);
 1810                 if (ln != NULL) {
 1811                         ln->la_expire = 0;  /* for IPv6 this means permanent */
 1812                         ln->ln_state = ND6_LLINFO_REACHABLE;
 1813                         /*
 1814                          * initialize for rtmsg generation
 1815                          */
 1816                         bzero(&gateway, sizeof(gateway));
 1817                         gateway.sdl_len = sizeof(gateway);
 1818                         gateway.sdl_family = AF_LINK;
 1819                         gateway.sdl_nlen = 0;
 1820                         gateway.sdl_alen = 6;
 1821                         memcpy(gateway.sdl_data, &ln->ll_addr.mac_aligned, sizeof(ln->ll_addr));
 1822                         /* */
 1823                         LLE_WUNLOCK(ln);
 1824                 }
 1825 
 1826                 bzero(&rt, sizeof(rt));
 1827                 rt.rt_gateway = (struct sockaddr *)&gateway;
 1828                 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
 1829                 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
 1830                 rt_mask(&rt) = (struct sockaddr *)&mask;
 1831                 rt_key(&rt) = (struct sockaddr *)&addr;
 1832                 rt.rt_flags = RTF_UP | RTF_HOST | RTF_STATIC;
 1833                 rt_newaddrmsg(RTM_ADD, &ia->ia_ifa, 0, &rt);
 1834         }
 1835 
 1836         return (error);
 1837 }
 1838 
 1839 /*
 1840  * Find an IPv6 interface link-local address specific to an interface.
 1841  * ifaddr is returned referenced.
 1842  */
 1843 struct in6_ifaddr *
 1844 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
 1845 {
 1846         struct ifaddr *ifa;
 1847 
 1848         IF_ADDR_LOCK(ifp);
 1849         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1850                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1851                         continue;
 1852                 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
 1853                         if ((((struct in6_ifaddr *)ifa)->ia6_flags &
 1854                              ignoreflags) != 0)
 1855                                 continue;
 1856                         ifa_ref(ifa);
 1857                         break;
 1858                 }
 1859         }
 1860         IF_ADDR_UNLOCK(ifp);
 1861 
 1862         return ((struct in6_ifaddr *)ifa);
 1863 }
 1864 
 1865 
 1866 /*
 1867  * find the internet address corresponding to a given interface and address.
 1868  * ifaddr is returned referenced.
 1869  */
 1870 struct in6_ifaddr *
 1871 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
 1872 {
 1873         struct ifaddr *ifa;
 1874 
 1875         IF_ADDR_LOCK(ifp);
 1876         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1877                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1878                         continue;
 1879                 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
 1880                         ifa_ref(ifa);
 1881                         break;
 1882                 }
 1883         }
 1884         IF_ADDR_UNLOCK(ifp);
 1885 
 1886         return ((struct in6_ifaddr *)ifa);
 1887 }
 1888 
 1889 /*
 1890  * Convert IP6 address to printable (loggable) representation. Caller
 1891  * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
 1892  */
 1893 static char digits[] = "0123456789abcdef";
 1894 char *
 1895 ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
 1896 {
 1897         int i;
 1898         char *cp;
 1899         const u_int16_t *a = (const u_int16_t *)addr;
 1900         const u_int8_t *d;
 1901         int dcolon = 0, zero = 0;
 1902 
 1903         cp = ip6buf;
 1904 
 1905         for (i = 0; i < 8; i++) {
 1906                 if (dcolon == 1) {
 1907                         if (*a == 0) {
 1908                                 if (i == 7)
 1909                                         *cp++ = ':';
 1910                                 a++;
 1911                                 continue;
 1912                         } else
 1913                                 dcolon = 2;
 1914                 }
 1915                 if (*a == 0) {
 1916                         if (dcolon == 0 && *(a + 1) == 0) {
 1917                                 if (i == 0)
 1918                                         *cp++ = ':';
 1919                                 *cp++ = ':';
 1920                                 dcolon = 1;
 1921                         } else {
 1922                                 *cp++ = '';
 1923                                 *cp++ = ':';
 1924                         }
 1925                         a++;
 1926                         continue;
 1927                 }
 1928                 d = (const u_char *)a;
 1929                 /* Try to eliminate leading zeros in printout like in :0001. */
 1930                 zero = 1;
 1931                 *cp = digits[*d >> 4];
 1932                 if (*cp != '') {
 1933                         zero = 0;
 1934                         cp++;
 1935                 }
 1936                 *cp = digits[*d++ & 0xf];
 1937                 if (zero == 0 || (*cp != '')) {
 1938                         zero = 0;
 1939                         cp++;
 1940                 }
 1941                 *cp = digits[*d >> 4];
 1942                 if (zero == 0 || (*cp != '')) {
 1943                         zero = 0;
 1944                         cp++;
 1945                 }
 1946                 *cp++ = digits[*d & 0xf];
 1947                 *cp++ = ':';
 1948                 a++;
 1949         }
 1950         *--cp = '\0';
 1951         return (ip6buf);
 1952 }
 1953 
 1954 int
 1955 in6_localaddr(struct in6_addr *in6)
 1956 {
 1957         struct in6_ifaddr *ia;
 1958 
 1959         if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
 1960                 return 1;
 1961 
 1962         IN6_IFADDR_RLOCK();
 1963         TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
 1964                 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
 1965                     &ia->ia_prefixmask.sin6_addr)) {
 1966                         IN6_IFADDR_RUNLOCK();
 1967                         return 1;
 1968                 }
 1969         }
 1970         IN6_IFADDR_RUNLOCK();
 1971 
 1972         return (0);
 1973 }
 1974 
 1975 int
 1976 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
 1977 {
 1978         struct in6_ifaddr *ia;
 1979 
 1980         IN6_IFADDR_RLOCK();
 1981         TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
 1982                 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
 1983                                        &sa6->sin6_addr) &&
 1984                     (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) {
 1985                         IN6_IFADDR_RUNLOCK();
 1986                         return (1); /* true */
 1987                 }
 1988 
 1989                 /* XXX: do we still have to go thru the rest of the list? */
 1990         }
 1991         IN6_IFADDR_RUNLOCK();
 1992 
 1993         return (0);             /* false */
 1994 }
 1995 
 1996 /*
 1997  * return length of part which dst and src are equal
 1998  * hard coding...
 1999  */
 2000 int
 2001 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
 2002 {
 2003         int match = 0;
 2004         u_char *s = (u_char *)src, *d = (u_char *)dst;
 2005         u_char *lim = s + 16, r;
 2006 
 2007         while (s < lim)
 2008                 if ((r = (*d++ ^ *s++)) != 0) {
 2009                         while (r < 128) {
 2010                                 match++;
 2011                                 r <<= 1;
 2012                         }
 2013                         break;
 2014                 } else
 2015                         match += 8;
 2016         return match;
 2017 }
 2018 
 2019 /* XXX: to be scope conscious */
 2020 int
 2021 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
 2022 {
 2023         int bytelen, bitlen;
 2024 
 2025         /* sanity check */
 2026         if (0 > len || len > 128) {
 2027                 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
 2028                     len);
 2029                 return (0);
 2030         }
 2031 
 2032         bytelen = len / 8;
 2033         bitlen = len % 8;
 2034 
 2035         if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
 2036                 return (0);
 2037         if (bitlen != 0 &&
 2038             p1->s6_addr[bytelen] >> (8 - bitlen) !=
 2039             p2->s6_addr[bytelen] >> (8 - bitlen))
 2040                 return (0);
 2041 
 2042         return (1);
 2043 }
 2044 
 2045 void
 2046 in6_prefixlen2mask(struct in6_addr *maskp, int len)
 2047 {
 2048         u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
 2049         int bytelen, bitlen, i;
 2050 
 2051         /* sanity check */
 2052         if (0 > len || len > 128) {
 2053                 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
 2054                     len);
 2055                 return;
 2056         }
 2057 
 2058         bzero(maskp, sizeof(*maskp));
 2059         bytelen = len / 8;
 2060         bitlen = len % 8;
 2061         for (i = 0; i < bytelen; i++)
 2062                 maskp->s6_addr[i] = 0xff;
 2063         if (bitlen)
 2064                 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
 2065 }
 2066 
 2067 /*
 2068  * return the best address out of the same scope. if no address was
 2069  * found, return the first valid address from designated IF.
 2070  */
 2071 struct in6_ifaddr *
 2072 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
 2073 {
 2074         int dst_scope = in6_addrscope(dst), blen = -1, tlen;
 2075         struct ifaddr *ifa;
 2076         struct in6_ifaddr *besta = 0;
 2077         struct in6_ifaddr *dep[2];      /* last-resort: deprecated */
 2078 
 2079         dep[0] = dep[1] = NULL;
 2080 
 2081         /*
 2082          * We first look for addresses in the same scope.
 2083          * If there is one, return it.
 2084          * If two or more, return one which matches the dst longest.
 2085          * If none, return one of global addresses assigned other ifs.
 2086          */
 2087         IF_ADDR_LOCK(ifp);
 2088         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 2089                 if (ifa->ifa_addr->sa_family != AF_INET6)
 2090                         continue;
 2091                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
 2092                         continue; /* XXX: is there any case to allow anycast? */
 2093                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
 2094                         continue; /* don't use this interface */
 2095                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
 2096                         continue;
 2097                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
 2098                         if (V_ip6_use_deprecated)
 2099                                 dep[0] = (struct in6_ifaddr *)ifa;
 2100                         continue;
 2101                 }
 2102 
 2103                 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
 2104                         /*
 2105                          * call in6_matchlen() as few as possible
 2106                          */
 2107                         if (besta) {
 2108                                 if (blen == -1)
 2109                                         blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
 2110                                 tlen = in6_matchlen(IFA_IN6(ifa), dst);
 2111                                 if (tlen > blen) {
 2112                                         blen = tlen;
 2113                                         besta = (struct in6_ifaddr *)ifa;
 2114                                 }
 2115                         } else
 2116                                 besta = (struct in6_ifaddr *)ifa;
 2117                 }
 2118         }
 2119         if (besta) {
 2120                 ifa_ref(&besta->ia_ifa);
 2121                 IF_ADDR_UNLOCK(ifp);
 2122                 return (besta);
 2123         }
 2124         IF_ADDR_UNLOCK(ifp);
 2125 
 2126         IN6_IFADDR_RLOCK();
 2127         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 2128                 if (ifa->ifa_addr->sa_family != AF_INET6)
 2129                         continue;
 2130                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
 2131                         continue; /* XXX: is there any case to allow anycast? */
 2132                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
 2133                         continue; /* don't use this interface */
 2134                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
 2135                         continue;
 2136                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
 2137                         if (V_ip6_use_deprecated)
 2138                                 dep[1] = (struct in6_ifaddr *)ifa;
 2139                         continue;
 2140                 }
 2141 
 2142                 if (ifa != NULL)
 2143                         ifa_ref(ifa);
 2144                 IN6_IFADDR_RUNLOCK();
 2145                 return (struct in6_ifaddr *)ifa;
 2146         }
 2147         IN6_IFADDR_RUNLOCK();
 2148 
 2149         /* use the last-resort values, that are, deprecated addresses */
 2150         if (dep[0])
 2151                 return dep[0];
 2152         if (dep[1])
 2153                 return dep[1];
 2154 
 2155         return NULL;
 2156 }
 2157 
 2158 /*
 2159  * perform DAD when interface becomes IFF_UP.
 2160  */
 2161 void
 2162 in6_if_up(struct ifnet *ifp)
 2163 {
 2164         struct ifaddr *ifa;
 2165         struct in6_ifaddr *ia;
 2166 
 2167         IF_ADDR_LOCK(ifp);
 2168         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 2169                 if (ifa->ifa_addr->sa_family != AF_INET6)
 2170                         continue;
 2171                 ia = (struct in6_ifaddr *)ifa;
 2172                 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
 2173                         /*
 2174                          * The TENTATIVE flag was likely set by hand
 2175                          * beforehand, implicitly indicating the need for DAD.
 2176                          * We may be able to skip the random delay in this
 2177                          * case, but we impose delays just in case.
 2178                          */
 2179                         nd6_dad_start(ifa,
 2180                             arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
 2181                 }
 2182         }
 2183         IF_ADDR_UNLOCK(ifp);
 2184 
 2185         /*
 2186          * special cases, like 6to4, are handled in in6_ifattach
 2187          */
 2188         in6_ifattach(ifp, NULL);
 2189 }
 2190 
 2191 int
 2192 in6if_do_dad(struct ifnet *ifp)
 2193 {
 2194         if ((ifp->if_flags & IFF_LOOPBACK) != 0)
 2195                 return (0);
 2196 
 2197         switch (ifp->if_type) {
 2198 #ifdef IFT_DUMMY
 2199         case IFT_DUMMY:
 2200 #endif
 2201         case IFT_FAITH:
 2202                 /*
 2203                  * These interfaces do not have the IFF_LOOPBACK flag,
 2204                  * but loop packets back.  We do not have to do DAD on such
 2205                  * interfaces.  We should even omit it, because loop-backed
 2206                  * NS would confuse the DAD procedure.
 2207                  */
 2208                 return (0);
 2209         default:
 2210                 /*
 2211                  * Our DAD routine requires the interface up and running.
 2212                  * However, some interfaces can be up before the RUNNING
 2213                  * status.  Additionaly, users may try to assign addresses
 2214                  * before the interface becomes up (or running).
 2215                  * We simply skip DAD in such a case as a work around.
 2216                  * XXX: we should rather mark "tentative" on such addresses,
 2217                  * and do DAD after the interface becomes ready.
 2218                  */
 2219                 if (!((ifp->if_flags & IFF_UP) &&
 2220                     (ifp->if_drv_flags & IFF_DRV_RUNNING)))
 2221                         return (0);
 2222 
 2223                 return (1);
 2224         }
 2225 }
 2226 
 2227 /*
 2228  * Calculate max IPv6 MTU through all the interfaces and store it
 2229  * to in6_maxmtu.
 2230  */
 2231 void
 2232 in6_setmaxmtu(void)
 2233 {
 2234         unsigned long maxmtu = 0;
 2235         struct ifnet *ifp;
 2236 
 2237         IFNET_RLOCK_NOSLEEP();
 2238         for (ifp = TAILQ_FIRST(&V_ifnet); ifp;
 2239             ifp = TAILQ_NEXT(ifp, if_list)) {
 2240                 /* this function can be called during ifnet initialization */
 2241                 if (!ifp->if_afdata[AF_INET6])
 2242                         continue;
 2243                 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
 2244                     IN6_LINKMTU(ifp) > maxmtu)
 2245                         maxmtu = IN6_LINKMTU(ifp);
 2246         }
 2247         IFNET_RUNLOCK_NOSLEEP();
 2248         if (maxmtu)          /* update only when maxmtu is positive */
 2249                 V_in6_maxmtu = maxmtu;
 2250 }
 2251 
 2252 /*
 2253  * Provide the length of interface identifiers to be used for the link attached
 2254  * to the given interface.  The length should be defined in "IPv6 over
 2255  * xxx-link" document.  Note that address architecture might also define
 2256  * the length for a particular set of address prefixes, regardless of the
 2257  * link type.  As clarified in rfc2462bis, those two definitions should be
 2258  * consistent, and those really are as of August 2004.
 2259  */
 2260 int
 2261 in6_if2idlen(struct ifnet *ifp)
 2262 {
 2263         switch (ifp->if_type) {
 2264         case IFT_ETHER:         /* RFC2464 */
 2265 #ifdef IFT_PROPVIRTUAL
 2266         case IFT_PROPVIRTUAL:   /* XXX: no RFC. treat it as ether */
 2267 #endif
 2268 #ifdef IFT_L2VLAN
 2269         case IFT_L2VLAN:        /* ditto */
 2270 #endif
 2271 #ifdef IFT_IEEE80211
 2272         case IFT_IEEE80211:     /* ditto */
 2273 #endif
 2274 #ifdef IFT_MIP
 2275         case IFT_MIP:   /* ditto */
 2276 #endif
 2277                 return (64);
 2278         case IFT_FDDI:          /* RFC2467 */
 2279                 return (64);
 2280         case IFT_ISO88025:      /* RFC2470 (IPv6 over Token Ring) */
 2281                 return (64);
 2282         case IFT_PPP:           /* RFC2472 */
 2283                 return (64);
 2284         case IFT_ARCNET:        /* RFC2497 */
 2285                 return (64);
 2286         case IFT_FRELAY:        /* RFC2590 */
 2287                 return (64);
 2288         case IFT_IEEE1394:      /* RFC3146 */
 2289                 return (64);
 2290         case IFT_GIF:
 2291                 return (64);    /* draft-ietf-v6ops-mech-v2-07 */
 2292         case IFT_LOOP:
 2293                 return (64);    /* XXX: is this really correct? */
 2294         default:
 2295                 /*
 2296                  * Unknown link type:
 2297                  * It might be controversial to use the today's common constant
 2298                  * of 64 for these cases unconditionally.  For full compliance,
 2299                  * we should return an error in this case.  On the other hand,
 2300                  * if we simply miss the standard for the link type or a new
 2301                  * standard is defined for a new link type, the IFID length
 2302                  * is very likely to be the common constant.  As a compromise,
 2303                  * we always use the constant, but make an explicit notice
 2304                  * indicating the "unknown" case.
 2305                  */
 2306                 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
 2307                 return (64);
 2308         }
 2309 }
 2310 
 2311 #include <sys/sysctl.h>
 2312 
 2313 struct in6_llentry {
 2314         struct llentry          base;
 2315         struct sockaddr_in6     l3_addr6;
 2316 };
 2317 
 2318 static struct llentry *
 2319 in6_lltable_new(const struct sockaddr *l3addr, u_int flags)
 2320 {
 2321         struct in6_llentry *lle;
 2322 
 2323         lle = malloc(sizeof(struct in6_llentry), M_LLTABLE,
 2324             M_DONTWAIT | M_ZERO);
 2325         if (lle == NULL)                /* NB: caller generates msg */
 2326                 return NULL;
 2327 
 2328         callout_init(&lle->base.ln_timer_ch, CALLOUT_MPSAFE);
 2329         lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr;
 2330         lle->base.lle_refcnt = 1;
 2331         LLE_LOCK_INIT(&lle->base);
 2332         return &lle->base;
 2333 }
 2334 
 2335 /*
 2336  * Deletes an address from the address table.
 2337  * This function is called by the timer functions
 2338  * such as arptimer() and nd6_llinfo_timer(), and
 2339  * the caller does the locking.
 2340  */
 2341 static void
 2342 in6_lltable_free(struct lltable *llt, struct llentry *lle)
 2343 {
 2344         LLE_WUNLOCK(lle);
 2345         LLE_LOCK_DESTROY(lle);
 2346         free(lle, M_LLTABLE);
 2347 }
 2348 
 2349 static void
 2350 in6_lltable_prefix_free(struct lltable *llt, 
 2351                         const struct sockaddr *prefix,
 2352                         const struct sockaddr *mask)
 2353 {
 2354         const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix;
 2355         const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask;
 2356         struct llentry *lle, *next;
 2357         register int i;
 2358 
 2359         for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
 2360                 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
 2361                         if (IN6_ARE_MASKED_ADDR_EQUAL(
 2362                                     &((struct sockaddr_in6 *)L3_ADDR(lle))->sin6_addr, 
 2363                                     &pfx->sin6_addr, 
 2364                                     &msk->sin6_addr)) {
 2365                                 int canceled;
 2366 
 2367                                 canceled = callout_drain(&lle->la_timer);
 2368                                 LLE_WLOCK(lle);
 2369                                 if (canceled)
 2370                                         LLE_REMREF(lle);
 2371                                 llentry_free(lle);
 2372                         }
 2373                 }
 2374         }
 2375 }
 2376 
 2377 static int
 2378 in6_lltable_rtcheck(struct ifnet *ifp, 
 2379                     u_int flags, 
 2380                     const struct sockaddr *l3addr)
 2381 {
 2382         struct rtentry *rt;
 2383         char ip6buf[INET6_ADDRSTRLEN];
 2384 
 2385         KASSERT(l3addr->sa_family == AF_INET6,
 2386             ("sin_family %d", l3addr->sa_family));
 2387 
 2388         /* XXX rtalloc1 should take a const param */
 2389         rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0);
 2390         if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
 2391                 struct ifaddr *ifa;
 2392                 /* 
 2393                  * Create an ND6 cache for an IPv6 neighbor 
 2394                  * that is not covered by our own prefix.
 2395                  */
 2396                 /* XXX ifaof_ifpforaddr should take a const param */
 2397                 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp);
 2398                 if (ifa != NULL) {
 2399                         ifa_free(ifa);
 2400                         if (rt != NULL)
 2401                                 RTFREE_LOCKED(rt);
 2402                         return 0;
 2403                 }
 2404                 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
 2405                     ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr));
 2406                 if (rt != NULL)
 2407                         RTFREE_LOCKED(rt);
 2408                 return EINVAL;
 2409         }
 2410         RTFREE_LOCKED(rt);
 2411         return 0;
 2412 }
 2413 
 2414 static struct llentry *
 2415 in6_lltable_lookup(struct lltable *llt, u_int flags,
 2416         const struct sockaddr *l3addr)
 2417 {
 2418         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
 2419         struct ifnet *ifp = llt->llt_ifp;
 2420         struct llentry *lle;
 2421         struct llentries *lleh;
 2422         u_int hashkey;
 2423 
 2424         IF_AFDATA_LOCK_ASSERT(ifp);
 2425         KASSERT(l3addr->sa_family == AF_INET6,
 2426             ("sin_family %d", l3addr->sa_family));
 2427 
 2428         hashkey = sin6->sin6_addr.s6_addr32[3];
 2429         lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
 2430         LIST_FOREACH(lle, lleh, lle_next) {
 2431                 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle);
 2432                 if (lle->la_flags & LLE_DELETED)
 2433                         continue;
 2434                 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr, 
 2435                          sizeof(struct in6_addr)) == 0)
 2436                         break;
 2437         }
 2438 
 2439         if (lle == NULL) {
 2440                 if (!(flags & LLE_CREATE))
 2441                         return (NULL);
 2442                 /*
 2443                  * A route that covers the given address must have
 2444                  * been installed 1st because we are doing a resolution,
 2445                  * verify this.
 2446                  */
 2447                 if (!(flags & LLE_IFADDR) &&
 2448                     in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
 2449                         return NULL;
 2450 
 2451                 lle = in6_lltable_new(l3addr, flags);
 2452                 if (lle == NULL) {
 2453                         log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
 2454                         return NULL;
 2455                 }
 2456                 lle->la_flags = flags & ~LLE_CREATE;
 2457                 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
 2458                         bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
 2459                         lle->la_flags |= (LLE_VALID | LLE_STATIC);
 2460                 }
 2461 
 2462                 lle->lle_tbl  = llt;
 2463                 lle->lle_head = lleh;
 2464                 LIST_INSERT_HEAD(lleh, lle, lle_next);
 2465         } else if (flags & LLE_DELETE) {
 2466                 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
 2467                         LLE_WLOCK(lle);
 2468                         lle->la_flags = LLE_DELETED;
 2469                         LLE_WUNLOCK(lle);
 2470 #ifdef DIAGNOSTIC
 2471                         log(LOG_INFO, "ifaddr cache = %p  is deleted\n", lle);  
 2472 #endif  
 2473                 }
 2474                 lle = (void *)-1;
 2475         }
 2476         if (LLE_IS_VALID(lle)) {
 2477                 if (flags & LLE_EXCLUSIVE)
 2478                         LLE_WLOCK(lle);
 2479                 else
 2480                         LLE_RLOCK(lle);
 2481         }
 2482         return (lle);
 2483 }
 2484 
 2485 static int
 2486 in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
 2487 {
 2488         struct ifnet *ifp = llt->llt_ifp;
 2489         struct llentry *lle;
 2490         /* XXX stack use */
 2491         struct {
 2492                 struct rt_msghdr        rtm;
 2493                 struct sockaddr_in6     sin6;
 2494                 /*
 2495                  * ndp.c assumes that sdl is word aligned
 2496                  */
 2497 #ifdef __LP64__
 2498                 uint32_t                pad;
 2499 #endif
 2500                 struct sockaddr_dl      sdl;
 2501         } ndpc;
 2502         int i, error;
 2503 
 2504         if (ifp->if_flags & IFF_LOOPBACK)
 2505                 return 0;
 2506 
 2507         LLTABLE_LOCK_ASSERT();
 2508 
 2509         error = 0;
 2510         for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
 2511                 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
 2512                         struct sockaddr_dl *sdl;
 2513 
 2514                         /* skip deleted or invalid entries */
 2515                         if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID)
 2516                                 continue;
 2517                         /* Skip if jailed and not a valid IP of the prison. */
 2518                         if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
 2519                                 continue;
 2520                         /*
 2521                          * produce a msg made of:
 2522                          *  struct rt_msghdr;
 2523                          *  struct sockaddr_in6 (IPv6)
 2524                          *  struct sockaddr_dl;
 2525                          */
 2526                         bzero(&ndpc, sizeof(ndpc));
 2527                         ndpc.rtm.rtm_msglen = sizeof(ndpc);
 2528                         ndpc.rtm.rtm_version = RTM_VERSION;
 2529                         ndpc.rtm.rtm_type = RTM_GET;
 2530                         ndpc.rtm.rtm_flags = RTF_UP;
 2531                         ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
 2532                         ndpc.sin6.sin6_family = AF_INET6;
 2533                         ndpc.sin6.sin6_len = sizeof(ndpc.sin6);
 2534                         bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle));
 2535 
 2536                         /* publish */
 2537                         if (lle->la_flags & LLE_PUB)
 2538                                 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
 2539 
 2540                         sdl = &ndpc.sdl;
 2541                         sdl->sdl_family = AF_LINK;
 2542                         sdl->sdl_len = sizeof(*sdl);
 2543                         sdl->sdl_alen = ifp->if_addrlen;
 2544                         sdl->sdl_index = ifp->if_index;
 2545                         sdl->sdl_type = ifp->if_type;
 2546                         bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
 2547                         ndpc.rtm.rtm_rmx.rmx_expire =
 2548                             lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
 2549                         ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
 2550                         if (lle->la_flags & LLE_STATIC)
 2551                                 ndpc.rtm.rtm_flags |= RTF_STATIC;
 2552                         ndpc.rtm.rtm_index = ifp->if_index;
 2553                         error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
 2554                         if (error)
 2555                                 break;
 2556                 }
 2557         }
 2558         return error;
 2559 }
 2560 
 2561 void *
 2562 in6_domifattach(struct ifnet *ifp)
 2563 {
 2564         struct in6_ifextra *ext;
 2565 
 2566         ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
 2567         bzero(ext, sizeof(*ext));
 2568 
 2569         ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat),
 2570             M_IFADDR, M_WAITOK);
 2571         bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
 2572 
 2573         ext->icmp6_ifstat =
 2574             (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat),
 2575             M_IFADDR, M_WAITOK);
 2576         bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
 2577 
 2578         ext->nd_ifinfo = nd6_ifattach(ifp);
 2579         ext->scope6_id = scope6_ifattach(ifp);
 2580         ext->lltable = lltable_init(ifp, AF_INET6);
 2581         if (ext->lltable != NULL) {
 2582                 ext->lltable->llt_new = in6_lltable_new;
 2583                 ext->lltable->llt_free = in6_lltable_free;
 2584                 ext->lltable->llt_prefix_free = in6_lltable_prefix_free;
 2585                 ext->lltable->llt_rtcheck = in6_lltable_rtcheck;
 2586                 ext->lltable->llt_lookup = in6_lltable_lookup;
 2587                 ext->lltable->llt_dump = in6_lltable_dump;
 2588         }
 2589 
 2590         ext->mld_ifinfo = mld_domifattach(ifp);
 2591 
 2592         return ext;
 2593 }
 2594 
 2595 void
 2596 in6_domifdetach(struct ifnet *ifp, void *aux)
 2597 {
 2598         struct in6_ifextra *ext = (struct in6_ifextra *)aux;
 2599 
 2600         mld_domifdetach(ifp);
 2601         scope6_ifdetach(ext->scope6_id);
 2602         nd6_ifdetach(ext->nd_ifinfo);
 2603         lltable_free(ext->lltable);
 2604         free(ext->in6_ifstat, M_IFADDR);
 2605         free(ext->icmp6_ifstat, M_IFADDR);
 2606         free(ext, M_IFADDR);
 2607 }
 2608 
 2609 /*
 2610  * Convert sockaddr_in6 to sockaddr_in.  Original sockaddr_in6 must be
 2611  * v4 mapped addr or v4 compat addr
 2612  */
 2613 void
 2614 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
 2615 {
 2616 
 2617         bzero(sin, sizeof(*sin));
 2618         sin->sin_len = sizeof(struct sockaddr_in);
 2619         sin->sin_family = AF_INET;
 2620         sin->sin_port = sin6->sin6_port;
 2621         sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
 2622 }
 2623 
 2624 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
 2625 void
 2626 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
 2627 {
 2628         bzero(sin6, sizeof(*sin6));
 2629         sin6->sin6_len = sizeof(struct sockaddr_in6);
 2630         sin6->sin6_family = AF_INET6;
 2631         sin6->sin6_port = sin->sin_port;
 2632         sin6->sin6_addr.s6_addr32[0] = 0;
 2633         sin6->sin6_addr.s6_addr32[1] = 0;
 2634         sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
 2635         sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
 2636 }
 2637 
 2638 /* Convert sockaddr_in6 into sockaddr_in. */
 2639 void
 2640 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
 2641 {
 2642         struct sockaddr_in *sin_p;
 2643         struct sockaddr_in6 sin6;
 2644 
 2645         /*
 2646          * Save original sockaddr_in6 addr and convert it
 2647          * to sockaddr_in.
 2648          */
 2649         sin6 = *(struct sockaddr_in6 *)nam;
 2650         sin_p = (struct sockaddr_in *)nam;
 2651         in6_sin6_2_sin(sin_p, &sin6);
 2652 }
 2653 
 2654 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
 2655 void
 2656 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
 2657 {
 2658         struct sockaddr_in *sin_p;
 2659         struct sockaddr_in6 *sin6_p;
 2660 
 2661         sin6_p = malloc(sizeof *sin6_p, M_SONAME,
 2662                M_WAITOK);
 2663         sin_p = (struct sockaddr_in *)*nam;
 2664         in6_sin_2_v4mapsin6(sin_p, sin6_p);
 2665         free(*nam, M_SONAME);
 2666         *nam = (struct sockaddr *)sin6_p;
 2667 }

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