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


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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6.c

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    1 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $
   30  */
   31 
   32 /*-
   33  * Copyright (c) 1982, 1986, 1991, 1993
   34  *      The Regents of the University of California.  All rights reserved.
   35  *
   36  * Redistribution and use in source and binary forms, with or without
   37  * modification, are permitted provided that the following conditions
   38  * are met:
   39  * 1. Redistributions of source code must retain the above copyright
   40  *    notice, this list of conditions and the following disclaimer.
   41  * 2. Redistributions in binary form must reproduce the above copyright
   42  *    notice, this list of conditions and the following disclaimer in the
   43  *    documentation and/or other materials provided with the distribution.
   44  * 4. Neither the name of the University nor the names of its contributors
   45  *    may be used to endorse or promote products derived from this software
   46  *    without specific prior written permission.
   47  *
   48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   58  * SUCH DAMAGE.
   59  *
   60  *      @(#)in.c        8.2 (Berkeley) 11/15/93
   61  */
   62 
   63 #include <sys/cdefs.h>
   64 __FBSDID("$FreeBSD: releng/8.4/sys/netinet6/in6.c 255447 2013-09-10 10:14:19Z des $");
   65 
   66 #include "opt_compat.h"
   67 #include "opt_inet.h"
   68 #include "opt_inet6.h"
   69 
   70 #include <sys/param.h>
   71 #include <sys/errno.h>
   72 #include <sys/jail.h>
   73 #include <sys/malloc.h>
   74 #include <sys/socket.h>
   75 #include <sys/socketvar.h>
   76 #include <sys/sockio.h>
   77 #include <sys/systm.h>
   78 #include <sys/priv.h>
   79 #include <sys/proc.h>
   80 #include <sys/time.h>
   81 #include <sys/kernel.h>
   82 #include <sys/syslog.h>
   83 
   84 #include <net/if.h>
   85 #include <net/if_var.h>
   86 #include <net/if_types.h>
   87 #include <net/route.h>
   88 #include <net/if_dl.h>
   89 #include <net/vnet.h>
   90 
   91 #include <netinet/in.h>
   92 #include <netinet/in_var.h>
   93 #include <net/if_llatbl.h>
   94 #include <netinet/if_ether.h>
   95 #include <netinet/in_systm.h>
   96 #include <netinet/ip.h>
   97 #include <netinet/in_pcb.h>
   98 
   99 #include <netinet/ip6.h>
  100 #include <netinet6/ip6_var.h>
  101 #include <netinet6/nd6.h>
  102 #include <netinet6/mld6_var.h>
  103 #include <netinet6/ip6_mroute.h>
  104 #include <netinet6/in6_ifattach.h>
  105 #include <netinet6/scope6_var.h>
  106 #include <netinet6/in6_pcb.h>
  107 
  108 /*
  109  * Definitions of some costant IP6 addresses.
  110  */
  111 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
  112 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
  113 const struct in6_addr in6addr_nodelocal_allnodes =
  114         IN6ADDR_NODELOCAL_ALLNODES_INIT;
  115 const struct in6_addr in6addr_linklocal_allnodes =
  116         IN6ADDR_LINKLOCAL_ALLNODES_INIT;
  117 const struct in6_addr in6addr_linklocal_allrouters =
  118         IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
  119 const struct in6_addr in6addr_linklocal_allv2routers =
  120         IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
  121 
  122 const struct in6_addr in6mask0 = IN6MASK0;
  123 const struct in6_addr in6mask32 = IN6MASK32;
  124 const struct in6_addr in6mask64 = IN6MASK64;
  125 const struct in6_addr in6mask96 = IN6MASK96;
  126 const struct in6_addr in6mask128 = IN6MASK128;
  127 
  128 const struct sockaddr_in6 sa6_any =
  129         { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
  130 
  131 static int in6_lifaddr_ioctl __P((struct socket *, u_long, caddr_t,
  132         struct ifnet *, struct thread *));
  133 static int in6_ifinit __P((struct ifnet *, struct in6_ifaddr *,
  134         struct sockaddr_in6 *, int));
  135 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
  136 
  137 int     (*faithprefix_p)(struct in6_addr *);
  138 
  139 
  140 
  141 int
  142 in6_mask2len(struct in6_addr *mask, u_char *lim0)
  143 {
  144         int x = 0, y;
  145         u_char *lim = lim0, *p;
  146 
  147         /* ignore the scope_id part */
  148         if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
  149                 lim = (u_char *)mask + sizeof(*mask);
  150         for (p = (u_char *)mask; p < lim; x++, p++) {
  151                 if (*p != 0xff)
  152                         break;
  153         }
  154         y = 0;
  155         if (p < lim) {
  156                 for (y = 0; y < 8; y++) {
  157                         if ((*p & (0x80 >> y)) == 0)
  158                                 break;
  159                 }
  160         }
  161 
  162         /*
  163          * when the limit pointer is given, do a stricter check on the
  164          * remaining bits.
  165          */
  166         if (p < lim) {
  167                 if (y != 0 && (*p & (0x00ff >> y)) != 0)
  168                         return (-1);
  169                 for (p = p + 1; p < lim; p++)
  170                         if (*p != 0)
  171                                 return (-1);
  172         }
  173 
  174         return x * 8 + y;
  175 }
  176 
  177 #define ifa2ia6(ifa)    ((struct in6_ifaddr *)(ifa))
  178 #define ia62ifa(ia6)    (&((ia6)->ia_ifa))
  179 
  180 #ifdef COMPAT_FREEBSD32
  181 struct in6_ndifreq32 {
  182         char ifname[IFNAMSIZ];
  183         uint32_t ifindex;
  184 };
  185 #define SIOCGDEFIFACE32_IN6     _IOWR('i', 86, struct in6_ndifreq32)
  186 #endif
  187 
  188 int
  189 in6_control(struct socket *so, u_long cmd, caddr_t data,
  190     struct ifnet *ifp, struct thread *td)
  191 {
  192         struct  in6_ifreq *ifr = (struct in6_ifreq *)data;
  193         struct  in6_ifaddr *ia = NULL;
  194         struct  in6_aliasreq *ifra = (struct in6_aliasreq *)data;
  195         struct sockaddr_in6 *sa6;
  196         int error;
  197 
  198         switch (cmd) {
  199         case SIOCGETSGCNT_IN6:
  200         case SIOCGETMIFCNT_IN6:
  201                 /*      
  202                  * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c.
  203                  * We cannot see how that would be needed, so do not adjust the
  204                  * KPI blindly; more likely should clean up the IPv4 variant.
  205                  */
  206                 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
  207         }
  208 
  209         switch(cmd) {
  210         case SIOCAADDRCTL_POLICY:
  211         case SIOCDADDRCTL_POLICY:
  212                 if (td != NULL) {
  213                         error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
  214                         if (error)
  215                                 return (error);
  216                 }
  217                 return (in6_src_ioctl(cmd, data));
  218         }
  219 
  220         if (ifp == NULL)
  221                 return (EOPNOTSUPP);
  222 
  223         switch (cmd) {
  224         case SIOCSNDFLUSH_IN6:
  225         case SIOCSPFXFLUSH_IN6:
  226         case SIOCSRTRFLUSH_IN6:
  227         case SIOCSDEFIFACE_IN6:
  228         case SIOCSIFINFO_FLAGS:
  229         case SIOCSIFINFO_IN6:
  230                 if (td != NULL) {
  231                         error = priv_check(td, PRIV_NETINET_ND6);
  232                         if (error)
  233                                 return (error);
  234                 }
  235                 /* FALLTHROUGH */
  236         case OSIOCGIFINFO_IN6:
  237         case SIOCGIFINFO_IN6:
  238         case SIOCGDRLST_IN6:
  239         case SIOCGPRLST_IN6:
  240         case SIOCGNBRINFO_IN6:
  241         case SIOCGDEFIFACE_IN6:
  242                 return (nd6_ioctl(cmd, data, ifp));
  243 
  244 #ifdef COMPAT_FREEBSD32
  245         case SIOCGDEFIFACE32_IN6:
  246                 {
  247                         struct in6_ndifreq ndif;
  248                         struct in6_ndifreq32 *ndif32;
  249 
  250                         error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
  251                             ifp);
  252                         if (error)
  253                                 return (error);
  254                         ndif32 = (struct in6_ndifreq32 *)data;
  255                         ndif32->ifindex = ndif.ifindex;
  256                         return (0);
  257                 }
  258 #endif
  259         }
  260 
  261         switch (cmd) {
  262         case SIOCSIFPREFIX_IN6:
  263         case SIOCDIFPREFIX_IN6:
  264         case SIOCAIFPREFIX_IN6:
  265         case SIOCCIFPREFIX_IN6:
  266         case SIOCSGIFPREFIX_IN6:
  267         case SIOCGIFPREFIX_IN6:
  268                 log(LOG_NOTICE,
  269                     "prefix ioctls are now invalidated. "
  270                     "please use ifconfig.\n");
  271                 return (EOPNOTSUPP);
  272         }
  273 
  274         switch (cmd) {
  275         case SIOCSSCOPE6:
  276                 if (td != NULL) {
  277                         error = priv_check(td, PRIV_NETINET_SCOPE6);
  278                         if (error)
  279                                 return (error);
  280                 }
  281                 return (scope6_set(ifp,
  282                     (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
  283         case SIOCGSCOPE6:
  284                 return (scope6_get(ifp,
  285                     (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
  286         case SIOCGSCOPE6DEF:
  287                 return (scope6_get_default((struct scope6_id *)
  288                     ifr->ifr_ifru.ifru_scope_id));
  289         }
  290 
  291         switch (cmd) {
  292         case SIOCALIFADDR:
  293                 if (td != NULL) {
  294                         error = priv_check(td, PRIV_NET_ADDIFADDR);
  295                         if (error)
  296                                 return (error);
  297                 }
  298                 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
  299 
  300         case SIOCDLIFADDR:
  301                 if (td != NULL) {
  302                         error = priv_check(td, PRIV_NET_DELIFADDR);
  303                         if (error)
  304                                 return (error);
  305                 }
  306                 /* FALLTHROUGH */
  307         case SIOCGLIFADDR:
  308                 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
  309         }
  310 
  311         /*
  312          * Find address for this interface, if it exists.
  313          *
  314          * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
  315          * only, and used the first interface address as the target of other
  316          * operations (without checking ifra_addr).  This was because netinet
  317          * code/API assumed at most 1 interface address per interface.
  318          * Since IPv6 allows a node to assign multiple addresses
  319          * on a single interface, we almost always look and check the
  320          * presence of ifra_addr, and reject invalid ones here.
  321          * It also decreases duplicated code among SIOC*_IN6 operations.
  322          */
  323         switch (cmd) {
  324         case SIOCAIFADDR_IN6:
  325         case SIOCSIFPHYADDR_IN6:
  326                 sa6 = &ifra->ifra_addr;
  327                 break;
  328         case SIOCSIFADDR_IN6:
  329         case SIOCGIFADDR_IN6:
  330         case SIOCSIFDSTADDR_IN6:
  331         case SIOCSIFNETMASK_IN6:
  332         case SIOCGIFDSTADDR_IN6:
  333         case SIOCGIFNETMASK_IN6:
  334         case SIOCDIFADDR_IN6:
  335         case SIOCGIFPSRCADDR_IN6:
  336         case SIOCGIFPDSTADDR_IN6:
  337         case SIOCGIFAFLAG_IN6:
  338         case SIOCSNDFLUSH_IN6:
  339         case SIOCSPFXFLUSH_IN6:
  340         case SIOCSRTRFLUSH_IN6:
  341         case SIOCGIFALIFETIME_IN6:
  342         case SIOCSIFALIFETIME_IN6:
  343         case SIOCGIFSTAT_IN6:
  344         case SIOCGIFSTAT_ICMP6:
  345                 sa6 = &ifr->ifr_addr;
  346                 break;
  347         case SIOCSIFADDR:
  348         case SIOCSIFBRDADDR:
  349         case SIOCSIFDSTADDR:
  350         case SIOCSIFNETMASK:
  351                 /*
  352                  * Although we should pass any non-INET6 ioctl requests
  353                  * down to driver, we filter some legacy INET requests.
  354                  * Drivers trust SIOCSIFADDR et al to come from an already
  355                  * privileged layer, and do not perform any credentials
  356                  * checks or input validation.
  357                  */
  358                 return (EINVAL);
  359         default:
  360                 sa6 = NULL;
  361                 break;
  362         }
  363         if (sa6 && sa6->sin6_family == AF_INET6) {
  364                 if (sa6->sin6_scope_id != 0)
  365                         error = sa6_embedscope(sa6, 0);
  366                 else
  367                         error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
  368                 if (error != 0)
  369                         return (error);
  370                 if (td != NULL && (error = prison_check_ip6(td->td_ucred,
  371                     &sa6->sin6_addr)) != 0)
  372                         return (error);
  373                 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
  374         } else
  375                 ia = NULL;
  376 
  377         switch (cmd) {
  378         case SIOCSIFADDR_IN6:
  379         case SIOCSIFDSTADDR_IN6:
  380         case SIOCSIFNETMASK_IN6:
  381                 /*
  382                  * Since IPv6 allows a node to assign multiple addresses
  383                  * on a single interface, SIOCSIFxxx ioctls are deprecated.
  384                  */
  385                 /* we decided to obsolete this command (20000704) */
  386                 error = EINVAL;
  387                 goto out;
  388 
  389         case SIOCDIFADDR_IN6:
  390                 /*
  391                  * for IPv4, we look for existing in_ifaddr here to allow
  392                  * "ifconfig if0 delete" to remove the first IPv4 address on
  393                  * the interface.  For IPv6, as the spec allows multiple
  394                  * interface address from the day one, we consider "remove the
  395                  * first one" semantics to be not preferable.
  396                  */
  397                 if (ia == NULL) {
  398                         error = EADDRNOTAVAIL;
  399                         goto out;
  400                 }
  401                 /* FALLTHROUGH */
  402         case SIOCAIFADDR_IN6:
  403                 /*
  404                  * We always require users to specify a valid IPv6 address for
  405                  * the corresponding operation.
  406                  */
  407                 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
  408                     ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
  409                         error = EAFNOSUPPORT;
  410                         goto out;
  411                 }
  412 
  413                 if (td != NULL) {
  414                         error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 
  415                             PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
  416                         if (error)
  417                                 goto out;
  418                 }
  419                 break;
  420 
  421         case SIOCGIFADDR_IN6:
  422                 /* This interface is basically deprecated. use SIOCGIFCONF. */
  423                 /* FALLTHROUGH */
  424         case SIOCGIFAFLAG_IN6:
  425         case SIOCGIFNETMASK_IN6:
  426         case SIOCGIFDSTADDR_IN6:
  427         case SIOCGIFALIFETIME_IN6:
  428                 /* must think again about its semantics */
  429                 if (ia == NULL) {
  430                         error = EADDRNOTAVAIL;
  431                         goto out;
  432                 }
  433                 break;
  434 
  435         case SIOCSIFALIFETIME_IN6:
  436             {
  437                 struct in6_addrlifetime *lt;
  438 
  439                 if (td != NULL) {
  440                         error = priv_check(td, PRIV_NETINET_ALIFETIME6);
  441                         if (error)
  442                                 goto out;
  443                 }
  444                 if (ia == NULL) {
  445                         error = EADDRNOTAVAIL;
  446                         goto out;
  447                 }
  448                 /* sanity for overflow - beware unsigned */
  449                 lt = &ifr->ifr_ifru.ifru_lifetime;
  450                 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
  451                     lt->ia6t_vltime + time_second < time_second) {
  452                         error = EINVAL;
  453                         goto out;
  454                 }
  455                 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
  456                     lt->ia6t_pltime + time_second < time_second) {
  457                         error = EINVAL;
  458                         goto out;
  459                 }
  460                 break;
  461             }
  462         }
  463 
  464         switch (cmd) {
  465         case SIOCGIFADDR_IN6:
  466                 ifr->ifr_addr = ia->ia_addr;
  467                 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
  468                         goto out;
  469                 break;
  470 
  471         case SIOCGIFDSTADDR_IN6:
  472                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
  473                         error = EINVAL;
  474                         goto out;
  475                 }
  476                 /*
  477                  * XXX: should we check if ifa_dstaddr is NULL and return
  478                  * an error?
  479                  */
  480                 ifr->ifr_dstaddr = ia->ia_dstaddr;
  481                 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
  482                         goto out;
  483                 break;
  484 
  485         case SIOCGIFNETMASK_IN6:
  486                 ifr->ifr_addr = ia->ia_prefixmask;
  487                 break;
  488 
  489         case SIOCGIFAFLAG_IN6:
  490                 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
  491                 break;
  492 
  493         case SIOCGIFSTAT_IN6:
  494                 if (ifp == NULL) {
  495                         error = EINVAL;
  496                         goto out;
  497                 }
  498                 bzero(&ifr->ifr_ifru.ifru_stat,
  499                     sizeof(ifr->ifr_ifru.ifru_stat));
  500                 ifr->ifr_ifru.ifru_stat =
  501                     *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat;
  502                 break;
  503 
  504         case SIOCGIFSTAT_ICMP6:
  505                 if (ifp == NULL) {
  506                         error = EINVAL;
  507                         goto out;
  508                 }
  509                 bzero(&ifr->ifr_ifru.ifru_icmp6stat,
  510                     sizeof(ifr->ifr_ifru.ifru_icmp6stat));
  511                 ifr->ifr_ifru.ifru_icmp6stat =
  512                     *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
  513                 break;
  514 
  515         case SIOCGIFALIFETIME_IN6:
  516                 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
  517                 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
  518                         time_t maxexpire;
  519                         struct in6_addrlifetime *retlt =
  520                             &ifr->ifr_ifru.ifru_lifetime;
  521 
  522                         /*
  523                          * XXX: adjust expiration time assuming time_t is
  524                          * signed.
  525                          */
  526                         maxexpire = (-1) &
  527                             ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
  528                         if (ia->ia6_lifetime.ia6t_vltime <
  529                             maxexpire - ia->ia6_updatetime) {
  530                                 retlt->ia6t_expire = ia->ia6_updatetime +
  531                                     ia->ia6_lifetime.ia6t_vltime;
  532                         } else
  533                                 retlt->ia6t_expire = maxexpire;
  534                 }
  535                 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
  536                         time_t maxexpire;
  537                         struct in6_addrlifetime *retlt =
  538                             &ifr->ifr_ifru.ifru_lifetime;
  539 
  540                         /*
  541                          * XXX: adjust expiration time assuming time_t is
  542                          * signed.
  543                          */
  544                         maxexpire = (-1) &
  545                             ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
  546                         if (ia->ia6_lifetime.ia6t_pltime <
  547                             maxexpire - ia->ia6_updatetime) {
  548                                 retlt->ia6t_preferred = ia->ia6_updatetime +
  549                                     ia->ia6_lifetime.ia6t_pltime;
  550                         } else
  551                                 retlt->ia6t_preferred = maxexpire;
  552                 }
  553                 break;
  554 
  555         case SIOCSIFALIFETIME_IN6:
  556                 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
  557                 /* for sanity */
  558                 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
  559                         ia->ia6_lifetime.ia6t_expire =
  560                                 time_second + ia->ia6_lifetime.ia6t_vltime;
  561                 } else
  562                         ia->ia6_lifetime.ia6t_expire = 0;
  563                 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
  564                         ia->ia6_lifetime.ia6t_preferred =
  565                                 time_second + ia->ia6_lifetime.ia6t_pltime;
  566                 } else
  567                         ia->ia6_lifetime.ia6t_preferred = 0;
  568                 break;
  569 
  570         case SIOCAIFADDR_IN6:
  571         {
  572                 int i;
  573                 struct nd_prefixctl pr0;
  574                 struct nd_prefix *pr;
  575 
  576                 /*
  577                  * first, make or update the interface address structure,
  578                  * and link it to the list.
  579                  */
  580                 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
  581                         goto out;
  582                 if (ia != NULL)
  583                         ifa_free(&ia->ia_ifa);
  584                 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
  585                     == NULL) {
  586                         /*
  587                          * this can happen when the user specify the 0 valid
  588                          * lifetime.
  589                          */
  590                         break;
  591                 }
  592 
  593                 /*
  594                  * then, make the prefix on-link on the interface.
  595                  * XXX: we'd rather create the prefix before the address, but
  596                  * we need at least one address to install the corresponding
  597                  * interface route, so we configure the address first.
  598                  */
  599 
  600                 /*
  601                  * convert mask to prefix length (prefixmask has already
  602                  * been validated in in6_update_ifa().
  603                  */
  604                 bzero(&pr0, sizeof(pr0));
  605                 pr0.ndpr_ifp = ifp;
  606                 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
  607                     NULL);
  608                 if (pr0.ndpr_plen == 128) {
  609                         break;  /* we don't need to install a host route. */
  610                 }
  611                 pr0.ndpr_prefix = ifra->ifra_addr;
  612                 /* apply the mask for safety. */
  613                 for (i = 0; i < 4; i++) {
  614                         pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
  615                             ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
  616                 }
  617                 /*
  618                  * XXX: since we don't have an API to set prefix (not address)
  619                  * lifetimes, we just use the same lifetimes as addresses.
  620                  * The (temporarily) installed lifetimes can be overridden by
  621                  * later advertised RAs (when accept_rtadv is non 0), which is
  622                  * an intended behavior.
  623                  */
  624                 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
  625                 pr0.ndpr_raf_auto =
  626                     ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
  627                 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
  628                 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
  629 
  630                 /* add the prefix if not yet. */
  631                 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
  632                         /*
  633                          * nd6_prelist_add will install the corresponding
  634                          * interface route.
  635                          */
  636                         if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
  637                                 goto out;
  638                         if (pr == NULL) {
  639                                 log(LOG_ERR, "nd6_prelist_add succeeded but "
  640                                     "no prefix\n");
  641                                 error = EINVAL;
  642                                 goto out;
  643                         }
  644                 }
  645 
  646                 /* relate the address to the prefix */
  647                 if (ia->ia6_ndpr == NULL) {
  648                         ia->ia6_ndpr = pr;
  649                         pr->ndpr_refcnt++;
  650 
  651                         /*
  652                          * If this is the first autoconf address from the
  653                          * prefix, create a temporary address as well
  654                          * (when required).
  655                          */
  656                         if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
  657                             V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
  658                                 int e;
  659                                 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
  660                                         log(LOG_NOTICE, "in6_control: failed "
  661                                             "to create a temporary address, "
  662                                             "errno=%d\n", e);
  663                                 }
  664                         }
  665                 }
  666 
  667                 /*
  668                  * this might affect the status of autoconfigured addresses,
  669                  * that is, this address might make other addresses detached.
  670                  */
  671                 pfxlist_onlink_check();
  672                 if (error == 0 && ia)
  673                         EVENTHANDLER_INVOKE(ifaddr_event, ifp);
  674                 break;
  675         }
  676 
  677         case SIOCDIFADDR_IN6:
  678         {
  679                 struct nd_prefix *pr;
  680 
  681                 /*
  682                  * If the address being deleted is the only one that owns
  683                  * the corresponding prefix, expire the prefix as well.
  684                  * XXX: theoretically, we don't have to worry about such
  685                  * relationship, since we separate the address management
  686                  * and the prefix management.  We do this, however, to provide
  687                  * as much backward compatibility as possible in terms of
  688                  * the ioctl operation.
  689                  * Note that in6_purgeaddr() will decrement ndpr_refcnt.
  690                  */
  691                 pr = ia->ia6_ndpr;
  692                 in6_purgeaddr(&ia->ia_ifa);
  693                 if (pr && pr->ndpr_refcnt == 0)
  694                         prelist_remove(pr);
  695                 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
  696                 break;
  697         }
  698 
  699         default:
  700                 if (ifp == NULL || ifp->if_ioctl == 0) {
  701                         error = EOPNOTSUPP;
  702                         goto out;
  703                 }
  704                 error = (*ifp->if_ioctl)(ifp, cmd, data);
  705                 goto out;
  706         }
  707 
  708         error = 0;
  709 out:
  710         if (ia != NULL)
  711                 ifa_free(&ia->ia_ifa);
  712         return (error);
  713 }
  714 
  715 /*
  716  * Join necessary multicast groups.  Factored out from in6_update_ifa().
  717  * This entire work should only be done once, for the default FIB.
  718  */
  719 static int
  720 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
  721     struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
  722 {
  723         char ip6buf[INET6_ADDRSTRLEN];
  724         struct sockaddr_in6 mltaddr, mltmask;
  725         struct in6_addr llsol;
  726         struct in6_multi_mship *imm;
  727         struct rtentry *rt;
  728         int delay, error;
  729 
  730         KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
  731 
  732         /* Join solicited multicast addr for new host id. */
  733         bzero(&llsol, sizeof(struct in6_addr));
  734         llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
  735         llsol.s6_addr32[1] = 0;
  736         llsol.s6_addr32[2] = htonl(1);
  737         llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
  738         llsol.s6_addr8[12] = 0xff;
  739         if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) {
  740                 /* XXX: should not happen */
  741                 log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
  742                 goto cleanup;
  743         }
  744         delay = 0;
  745         if ((flags & IN6_IFAUPDATE_DADDELAY)) {
  746                 /*
  747                  * We need a random delay for DAD on the address being
  748                  * configured.  It also means delaying transmission of the
  749                  * corresponding MLD report to avoid report collision.
  750                  * [RFC 4861, Section 6.3.7]
  751                  */
  752                 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
  753         }
  754         imm = in6_joingroup(ifp, &llsol, &error, delay);
  755         if (imm == NULL) {
  756                 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
  757                     "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &llsol),
  758                     if_name(ifp), error));
  759                 goto cleanup;
  760         }
  761         LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
  762         *in6m_sol = imm->i6mm_maddr;
  763 
  764         bzero(&mltmask, sizeof(mltmask));
  765         mltmask.sin6_len = sizeof(struct sockaddr_in6);
  766         mltmask.sin6_family = AF_INET6;
  767         mltmask.sin6_addr = in6mask32;
  768 #define MLTMASK_LEN  4  /* mltmask's masklen (=32bit=4octet) */
  769 
  770         /*
  771          * Join link-local all-nodes address.
  772          */
  773         bzero(&mltaddr, sizeof(mltaddr));
  774         mltaddr.sin6_len = sizeof(struct sockaddr_in6);
  775         mltaddr.sin6_family = AF_INET6;
  776         mltaddr.sin6_addr = in6addr_linklocal_allnodes;
  777         if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
  778                 goto cleanup; /* XXX: should not fail */
  779 
  780         /*
  781          * XXX: do we really need this automatic routes?  We should probably
  782          * reconsider this stuff.  Most applications actually do not need the
  783          * routes, since they usually specify the outgoing interface.
  784          */
  785         rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
  786         if (rt != NULL) {
  787                 /* XXX: only works in !SCOPEDROUTING case. */
  788                 if (memcmp(&mltaddr.sin6_addr,
  789                     &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
  790                     MLTMASK_LEN)) {
  791                         RTFREE_LOCKED(rt);
  792                         rt = NULL;
  793                 }
  794         }
  795         if (rt == NULL) {
  796                 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
  797                     (struct sockaddr *)&ia->ia_addr,
  798                     (struct sockaddr *)&mltmask, RTF_UP,
  799                     (struct rtentry **)0, RT_DEFAULT_FIB);
  800                 if (error)
  801                         goto cleanup;
  802         } else
  803                 RTFREE_LOCKED(rt);
  804 
  805         imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
  806         if (imm == NULL) {
  807                 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
  808                     "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
  809                     &mltaddr.sin6_addr), if_name(ifp), error));
  810                 goto cleanup;
  811         }
  812         LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
  813 
  814         /*
  815          * Join node information group address.
  816          */
  817         delay = 0;
  818         if ((flags & IN6_IFAUPDATE_DADDELAY)) {
  819                 /*
  820                  * The spec does not say anything about delay for this group,
  821                  * but the same logic should apply.
  822                  */
  823                 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
  824         }
  825         if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) {
  826                 /* XXX jinmei */
  827                 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay);
  828                 if (imm == NULL)
  829                         nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
  830                             "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
  831                             &mltaddr.sin6_addr), if_name(ifp), error));
  832                         /* XXX not very fatal, go on... */
  833                 else
  834                         LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
  835         }
  836 
  837         /*
  838          * Join interface-local all-nodes address.
  839          * (ff01::1%ifN, and ff01::%ifN/32)
  840          */
  841         mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
  842         if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
  843                 goto cleanup; /* XXX: should not fail */
  844         /* XXX: again, do we really need the route? */
  845         rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
  846         if (rt != NULL) {
  847                 if (memcmp(&mltaddr.sin6_addr,
  848                     &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
  849                     MLTMASK_LEN)) {
  850                         RTFREE_LOCKED(rt);
  851                         rt = NULL;
  852                 }
  853         }
  854         if (rt == NULL) {
  855                 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
  856                     (struct sockaddr *)&ia->ia_addr,
  857                     (struct sockaddr *)&mltmask, RTF_UP,
  858                     (struct rtentry **)0, RT_DEFAULT_FIB);
  859                 if (error)
  860                         goto cleanup;
  861         } else
  862                 RTFREE_LOCKED(rt);
  863 
  864         imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
  865         if (imm == NULL) {
  866                 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
  867                     "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
  868                     &mltaddr.sin6_addr), if_name(ifp), error));
  869                 goto cleanup;
  870         }
  871         LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
  872 #undef  MLTMASK_LEN
  873 
  874 cleanup:
  875         return (error);
  876 }
  877 
  878 /*
  879  * Update parameters of an IPv6 interface address.
  880  * If necessary, a new entry is created and linked into address chains.
  881  * This function is separated from in6_control().
  882  * XXX: should this be performed under splnet()?
  883  */
  884 int
  885 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
  886     struct in6_ifaddr *ia, int flags)
  887 {
  888         int error = 0, hostIsNew = 0, plen = -1;
  889         struct sockaddr_in6 dst6;
  890         struct in6_addrlifetime *lt;
  891         struct in6_multi *in6m_sol;
  892         int delay;
  893         char ip6buf[INET6_ADDRSTRLEN];
  894 
  895         /* Validate parameters */
  896         if (ifp == NULL || ifra == NULL) /* this maybe redundant */
  897                 return (EINVAL);
  898 
  899         /*
  900          * The destination address for a p2p link must have a family
  901          * of AF_UNSPEC or AF_INET6.
  902          */
  903         if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
  904             ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
  905             ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
  906                 return (EAFNOSUPPORT);
  907         /*
  908          * validate ifra_prefixmask.  don't check sin6_family, netmask
  909          * does not carry fields other than sin6_len.
  910          */
  911         if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
  912                 return (EINVAL);
  913         /*
  914          * Because the IPv6 address architecture is classless, we require
  915          * users to specify a (non 0) prefix length (mask) for a new address.
  916          * We also require the prefix (when specified) mask is valid, and thus
  917          * reject a non-consecutive mask.
  918          */
  919         if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
  920                 return (EINVAL);
  921         if (ifra->ifra_prefixmask.sin6_len != 0) {
  922                 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
  923                     (u_char *)&ifra->ifra_prefixmask +
  924                     ifra->ifra_prefixmask.sin6_len);
  925                 if (plen <= 0)
  926                         return (EINVAL);
  927         } else {
  928                 /*
  929                  * In this case, ia must not be NULL.  We just use its prefix
  930                  * length.
  931                  */
  932                 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
  933         }
  934         /*
  935          * If the destination address on a p2p interface is specified,
  936          * and the address is a scoped one, validate/set the scope
  937          * zone identifier.
  938          */
  939         dst6 = ifra->ifra_dstaddr;
  940         if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
  941             (dst6.sin6_family == AF_INET6)) {
  942                 struct in6_addr in6_tmp;
  943                 u_int32_t zoneid;
  944 
  945                 in6_tmp = dst6.sin6_addr;
  946                 if (in6_setscope(&in6_tmp, ifp, &zoneid))
  947                         return (EINVAL); /* XXX: should be impossible */
  948 
  949                 if (dst6.sin6_scope_id != 0) {
  950                         if (dst6.sin6_scope_id != zoneid)
  951                                 return (EINVAL);
  952                 } else          /* user omit to specify the ID. */
  953                         dst6.sin6_scope_id = zoneid;
  954 
  955                 /* convert into the internal form */
  956                 if (sa6_embedscope(&dst6, 0))
  957                         return (EINVAL); /* XXX: should be impossible */
  958         }
  959         /*
  960          * The destination address can be specified only for a p2p or a
  961          * loopback interface.  If specified, the corresponding prefix length
  962          * must be 128.
  963          */
  964         if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
  965                 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
  966                         /* XXX: noisy message */
  967                         nd6log((LOG_INFO, "in6_update_ifa: a destination can "
  968                             "be specified for a p2p or a loopback IF only\n"));
  969                         return (EINVAL);
  970                 }
  971                 if (plen != 128) {
  972                         nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
  973                             "be 128 when dstaddr is specified\n"));
  974                         return (EINVAL);
  975                 }
  976         }
  977         /* lifetime consistency check */
  978         lt = &ifra->ifra_lifetime;
  979         if (lt->ia6t_pltime > lt->ia6t_vltime)
  980                 return (EINVAL);
  981         if (lt->ia6t_vltime == 0) {
  982                 /*
  983                  * the following log might be noisy, but this is a typical
  984                  * configuration mistake or a tool's bug.
  985                  */
  986                 nd6log((LOG_INFO,
  987                     "in6_update_ifa: valid lifetime is 0 for %s\n",
  988                     ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
  989 
  990                 if (ia == NULL)
  991                         return (0); /* there's nothing to do */
  992         }
  993 
  994         /*
  995          * If this is a new address, allocate a new ifaddr and link it
  996          * into chains.
  997          */
  998         if (ia == NULL) {
  999                 hostIsNew = 1;
 1000                 /*
 1001                  * When in6_update_ifa() is called in a process of a received
 1002                  * RA, it is called under an interrupt context.  So, we should
 1003                  * call malloc with M_NOWAIT.
 1004                  */
 1005                 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
 1006                     M_NOWAIT);
 1007                 if (ia == NULL)
 1008                         return (ENOBUFS);
 1009                 bzero((caddr_t)ia, sizeof(*ia));
 1010                 ifa_init(&ia->ia_ifa);
 1011                 LIST_INIT(&ia->ia6_memberships);
 1012                 /* Initialize the address and masks, and put time stamp */
 1013                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 1014                 ia->ia_addr.sin6_family = AF_INET6;
 1015                 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
 1016                 ia->ia6_createtime = time_second;
 1017                 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
 1018                         /*
 1019                          * XXX: some functions expect that ifa_dstaddr is not
 1020                          * NULL for p2p interfaces.
 1021                          */
 1022                         ia->ia_ifa.ifa_dstaddr =
 1023                             (struct sockaddr *)&ia->ia_dstaddr;
 1024                 } else {
 1025                         ia->ia_ifa.ifa_dstaddr = NULL;
 1026                 }
 1027                 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
 1028                 ia->ia_ifp = ifp;
 1029                 ifa_ref(&ia->ia_ifa);                   /* if_addrhead */
 1030                 IF_ADDR_WLOCK(ifp);
 1031                 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
 1032                 IF_ADDR_WUNLOCK(ifp);
 1033 
 1034                 ifa_ref(&ia->ia_ifa);                   /* in6_ifaddrhead */
 1035                 IN6_IFADDR_WLOCK();
 1036                 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
 1037                 IN6_IFADDR_WUNLOCK();
 1038         }
 1039 
 1040         /* update timestamp */
 1041         ia->ia6_updatetime = time_second;
 1042 
 1043         /* set prefix mask */
 1044         if (ifra->ifra_prefixmask.sin6_len) {
 1045                 /*
 1046                  * We prohibit changing the prefix length of an existing
 1047                  * address, because
 1048                  * + such an operation should be rare in IPv6, and
 1049                  * + the operation would confuse prefix management.
 1050                  */
 1051                 if (ia->ia_prefixmask.sin6_len &&
 1052                     in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
 1053                         nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
 1054                             " existing (%s) address should not be changed\n",
 1055                             ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
 1056                         error = EINVAL;
 1057                         goto unlink;
 1058                 }
 1059                 ia->ia_prefixmask = ifra->ifra_prefixmask;
 1060         }
 1061 
 1062         /*
 1063          * If a new destination address is specified, scrub the old one and
 1064          * install the new destination.  Note that the interface must be
 1065          * p2p or loopback (see the check above.)
 1066          */
 1067         if (dst6.sin6_family == AF_INET6 &&
 1068             !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
 1069                 int e;
 1070 
 1071                 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
 1072                     (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
 1073                         nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
 1074                             "a route to the old destination: %s\n",
 1075                             ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
 1076                         /* proceed anyway... */
 1077                 } else
 1078                         ia->ia_flags &= ~IFA_ROUTE;
 1079                 ia->ia_dstaddr = dst6;
 1080         }
 1081 
 1082         /*
 1083          * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
 1084          * to see if the address is deprecated or invalidated, but initialize
 1085          * these members for applications.
 1086          */
 1087         ia->ia6_lifetime = ifra->ifra_lifetime;
 1088         if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
 1089                 ia->ia6_lifetime.ia6t_expire =
 1090                     time_second + ia->ia6_lifetime.ia6t_vltime;
 1091         } else
 1092                 ia->ia6_lifetime.ia6t_expire = 0;
 1093         if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
 1094                 ia->ia6_lifetime.ia6t_preferred =
 1095                     time_second + ia->ia6_lifetime.ia6t_pltime;
 1096         } else
 1097                 ia->ia6_lifetime.ia6t_preferred = 0;
 1098 
 1099         /* reset the interface and routing table appropriately. */
 1100         if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
 1101                 goto unlink;
 1102 
 1103         /*
 1104          * configure address flags.
 1105          */
 1106         ia->ia6_flags = ifra->ifra_flags;
 1107         /*
 1108          * backward compatibility - if IN6_IFF_DEPRECATED is set from the
 1109          * userland, make it deprecated.
 1110          */
 1111         if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
 1112                 ia->ia6_lifetime.ia6t_pltime = 0;
 1113                 ia->ia6_lifetime.ia6t_preferred = time_second;
 1114         }
 1115         /*
 1116          * Make the address tentative before joining multicast addresses,
 1117          * so that corresponding MLD responses would not have a tentative
 1118          * source address.
 1119          */
 1120         ia->ia6_flags &= ~IN6_IFF_DUPLICATED;   /* safety */
 1121         if (hostIsNew && in6if_do_dad(ifp))
 1122                 ia->ia6_flags |= IN6_IFF_TENTATIVE;
 1123 
 1124         /*
 1125          * We are done if we have simply modified an existing address.
 1126          */
 1127         if (!hostIsNew)
 1128                 return (error);
 1129 
 1130         /*
 1131          * Beyond this point, we should call in6_purgeaddr upon an error,
 1132          * not just go to unlink.
 1133          */
 1134 
 1135         /* Join necessary multicast groups. */
 1136         in6m_sol = NULL;
 1137         if ((ifp->if_flags & IFF_MULTICAST) != 0) {
 1138                 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
 1139                 if (error)
 1140                         goto cleanup;
 1141         }
 1142 
 1143         /*
 1144          * Perform DAD, if needed.
 1145          * XXX It may be of use, if we can administratively disable DAD.
 1146          */
 1147         if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
 1148             (ia->ia6_flags & IN6_IFF_TENTATIVE))
 1149         {
 1150                 int mindelay, maxdelay;
 1151 
 1152                 delay = 0;
 1153                 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
 1154                         /*
 1155                          * We need to impose a delay before sending an NS
 1156                          * for DAD.  Check if we also needed a delay for the
 1157                          * corresponding MLD message.  If we did, the delay
 1158                          * should be larger than the MLD delay (this could be
 1159                          * relaxed a bit, but this simple logic is at least
 1160                          * safe).
 1161                          * XXX: Break data hiding guidelines and look at
 1162                          * state for the solicited multicast group.
 1163                          */
 1164                         mindelay = 0;
 1165                         if (in6m_sol != NULL &&
 1166                             in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
 1167                                 mindelay = in6m_sol->in6m_timer;
 1168                         }
 1169                         maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
 1170                         if (maxdelay - mindelay == 0)
 1171                                 delay = 0;
 1172                         else {
 1173                                 delay =
 1174                                     (arc4random() % (maxdelay - mindelay)) +
 1175                                     mindelay;
 1176                         }
 1177                 }
 1178                 nd6_dad_start((struct ifaddr *)ia, delay);
 1179         }
 1180 
 1181         KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew"));
 1182         ifa_free(&ia->ia_ifa);
 1183         return (error);
 1184 
 1185   unlink:
 1186         /*
 1187          * XXX: if a change of an existing address failed, keep the entry
 1188          * anyway.
 1189          */
 1190         if (hostIsNew) {
 1191                 in6_unlink_ifa(ia, ifp);
 1192                 ifa_free(&ia->ia_ifa);
 1193         }
 1194         return (error);
 1195 
 1196   cleanup:
 1197         KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew"));
 1198         ifa_free(&ia->ia_ifa);
 1199         in6_purgeaddr(&ia->ia_ifa);
 1200         return error;
 1201 }
 1202 
 1203 /*
 1204  * Leave multicast groups.  Factored out from in6_purgeaddr().
 1205  * This entire work should only be done once, for the default FIB.
 1206  */
 1207 static int
 1208 in6_purgeaddr_mc(struct ifnet *ifp, struct in6_ifaddr *ia, struct ifaddr *ifa0)
 1209 {
 1210         struct sockaddr_in6 mltaddr, mltmask;
 1211         struct in6_multi_mship *imm;
 1212         struct rtentry *rt;
 1213         struct sockaddr_in6 sin6;
 1214         int error;
 1215 
 1216         /*
 1217          * Leave from multicast groups we have joined for the interface.
 1218          */
 1219         while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
 1220                 LIST_REMOVE(imm, i6mm_chain);
 1221                 in6_leavegroup(imm);
 1222         }
 1223 
 1224         /*
 1225          * Remove the link-local all-nodes address.
 1226          */
 1227         bzero(&mltmask, sizeof(mltmask));
 1228         mltmask.sin6_len = sizeof(struct sockaddr_in6);
 1229         mltmask.sin6_family = AF_INET6;
 1230         mltmask.sin6_addr = in6mask32;
 1231 
 1232         bzero(&mltaddr, sizeof(mltaddr));
 1233         mltaddr.sin6_len = sizeof(struct sockaddr_in6);
 1234         mltaddr.sin6_family = AF_INET6;
 1235         mltaddr.sin6_addr = in6addr_linklocal_allnodes;
 1236 
 1237         if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
 1238                 return (error);
 1239 
 1240         /*
 1241          * As for the mltaddr above, proactively prepare the sin6 to avoid
 1242          * rtentry un- and re-locking.
 1243          */
 1244         if (ifa0 != NULL) {
 1245                 bzero(&sin6, sizeof(sin6));
 1246                 sin6.sin6_len = sizeof(sin6);
 1247                 sin6.sin6_family = AF_INET6;
 1248                 memcpy(&sin6.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 
 1249                     sizeof(sin6.sin6_addr));
 1250                 error = in6_setscope(&sin6.sin6_addr, ifa0->ifa_ifp, NULL);
 1251                 if (error != 0)
 1252                         return (error);
 1253         }
 1254 
 1255         rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
 1256         if (rt != NULL && rt->rt_gateway != NULL &&
 1257             (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 
 1258                     &ia->ia_addr.sin6_addr,
 1259                     sizeof(ia->ia_addr.sin6_addr)) == 0)) {
 1260                 /* 
 1261                  * If no more IPv6 address exists on this interface then
 1262                  * remove the multicast address route.
 1263                  */
 1264                 if (ifa0 == NULL) {
 1265                         memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr, 
 1266                                sizeof(mltaddr.sin6_addr));
 1267                         RTFREE_LOCKED(rt);
 1268                         error = in6_rtrequest(RTM_DELETE,
 1269                             (struct sockaddr *)&mltaddr,
 1270                             (struct sockaddr *)&ia->ia_addr,
 1271                             (struct sockaddr *)&mltmask, RTF_UP,
 1272                             (struct rtentry **)0, RT_DEFAULT_FIB);
 1273                         if (error)
 1274                                 log(LOG_INFO, "%s: link-local all-nodes "
 1275                                     "multicast address deletion error\n",
 1276                                     __func__);
 1277                 } else {
 1278                         /*
 1279                          * Replace the gateway of the route.
 1280                          */
 1281                         memcpy(rt->rt_gateway, &sin6, sizeof(sin6));
 1282                         RTFREE_LOCKED(rt);
 1283                 }
 1284         } else {
 1285                 if (rt != NULL)
 1286                         RTFREE_LOCKED(rt);
 1287         }
 1288 
 1289         /*
 1290          * Remove the node-local all-nodes address.
 1291          */
 1292         mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
 1293         if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
 1294                 return (error);
 1295 
 1296         rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
 1297         if (rt != NULL && rt->rt_gateway != NULL &&
 1298             (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 
 1299                     &ia->ia_addr.sin6_addr,
 1300                     sizeof(ia->ia_addr.sin6_addr)) == 0)) {
 1301                 /* 
 1302                  * If no more IPv6 address exists on this interface then
 1303                  * remove the multicast address route.
 1304                  */
 1305                 if (ifa0 == NULL) {
 1306                         memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr, 
 1307                                sizeof(mltaddr.sin6_addr));
 1308 
 1309                         RTFREE_LOCKED(rt);
 1310                         error = in6_rtrequest(RTM_DELETE,
 1311                             (struct sockaddr *)&mltaddr,
 1312                             (struct sockaddr *)&ia->ia_addr,
 1313                             (struct sockaddr *)&mltmask, RTF_UP,
 1314                             (struct rtentry **)0, RT_DEFAULT_FIB);
 1315                         if (error)
 1316                                 log(LOG_INFO, "%s: node-local all-nodes"
 1317                                     "multicast address deletion error\n",
 1318                                     __func__);
 1319                 } else {
 1320                         /*
 1321                          * Replace the gateway of the route.
 1322                          */
 1323                         memcpy(rt->rt_gateway, &sin6, sizeof(sin6));
 1324                         RTFREE_LOCKED(rt);
 1325                 }
 1326         } else {
 1327                 if (rt != NULL)
 1328                         RTFREE_LOCKED(rt);
 1329         }
 1330 
 1331         return (0);
 1332 }
 1333 
 1334 void
 1335 in6_purgeaddr(struct ifaddr *ifa)
 1336 {
 1337         struct ifnet *ifp = ifa->ifa_ifp;
 1338         struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
 1339         struct sockaddr_dl gateway;
 1340         struct sockaddr_in6 mask, addr;
 1341         struct rtentry rt0;
 1342         int plen, error;
 1343         struct ifaddr *ifa0;
 1344 
 1345         /*
 1346          * find another IPv6 address as the gateway for the
 1347          * link-local and node-local all-nodes multicast
 1348          * address routes
 1349          */
 1350         IF_ADDR_RLOCK(ifp);
 1351         TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) {
 1352                 if ((ifa0->ifa_addr->sa_family != AF_INET6) ||
 1353                     memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr,
 1354                            &ia->ia_addr.sin6_addr, 
 1355                            sizeof(struct in6_addr)) == 0)
 1356                         continue;
 1357                 else
 1358                         break;
 1359         }
 1360         if (ifa0 != NULL)
 1361                 ifa_ref(ifa0);
 1362         IF_ADDR_RUNLOCK(ifp);
 1363 
 1364         /*
 1365          * Remove the loopback route to the interface address.
 1366          * The check for the current setting of "nd6_useloopback" 
 1367          * is not needed.
 1368          */
 1369         if (ia->ia_flags & IFA_RTSELF) {
 1370                 error = ifa_del_loopback_route((struct ifaddr *)ia,
 1371                                        (struct sockaddr *)&ia->ia_addr);
 1372                 if (error == 0)
 1373                         ia->ia_flags &= ~IFA_RTSELF;
 1374         }
 1375 
 1376         /* stop DAD processing */
 1377         nd6_dad_stop(ifa);
 1378 
 1379         /* Remove local address entry from lltable. */
 1380         IF_AFDATA_LOCK(ifp);
 1381         lla_lookup(LLTABLE6(ifp), (LLE_DELETE | LLE_IFADDR),
 1382             (struct sockaddr *)&ia->ia_addr);
 1383         IF_AFDATA_UNLOCK(ifp);
 1384 
 1385         /*
 1386          * initialize for rtmsg generation
 1387          */
 1388         bzero(&gateway, sizeof(gateway));
 1389         gateway.sdl_len = sizeof(gateway);
 1390         gateway.sdl_family = AF_LINK;
 1391         gateway.sdl_nlen = 0;
 1392         gateway.sdl_alen = ifp->if_addrlen;
 1393         /* */
 1394         bzero(&rt0, sizeof(rt0));
 1395         rt0.rt_gateway = (struct sockaddr *)&gateway;
 1396         memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
 1397         memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
 1398         rt_mask(&rt0) = (struct sockaddr *)&mask;
 1399         rt_key(&rt0) = (struct sockaddr *)&addr;
 1400         rt0.rt_flags = RTF_HOST | RTF_STATIC;
 1401         rt_newaddrmsg(RTM_DELETE, ifa, 0, &rt0);
 1402 
 1403         /* Leave multicast groups. */
 1404         error = in6_purgeaddr_mc(ifp, ia, ifa0);
 1405 
 1406         if (ifa0 != NULL)
 1407                 ifa_free(ifa0);
 1408 
 1409         plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
 1410         if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
 1411                 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
 1412                     (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0);
 1413                 if (error != 0)
 1414                         log(LOG_INFO, "%s: err=%d, destination address delete "
 1415                             "failed\n", __func__, error);
 1416                 ia->ia_flags &= ~IFA_ROUTE;
 1417         }
 1418 
 1419         in6_unlink_ifa(ia, ifp);
 1420 }
 1421 
 1422 static void
 1423 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
 1424 {
 1425         int     s = splnet();
 1426 
 1427         IF_ADDR_WLOCK(ifp);
 1428         TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
 1429         IF_ADDR_WUNLOCK(ifp);
 1430         ifa_free(&ia->ia_ifa);                  /* if_addrhead */
 1431 
 1432         /*
 1433          * Defer the release of what might be the last reference to the
 1434          * in6_ifaddr so that it can't be freed before the remainder of the
 1435          * cleanup.
 1436          */
 1437         IN6_IFADDR_WLOCK();
 1438         TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
 1439         IN6_IFADDR_WUNLOCK();
 1440 
 1441         /*
 1442          * Release the reference to the base prefix.  There should be a
 1443          * positive reference.
 1444          */
 1445         if (ia->ia6_ndpr == NULL) {
 1446                 nd6log((LOG_NOTICE,
 1447                     "in6_unlink_ifa: autoconf'ed address "
 1448                     "%p has no prefix\n", ia));
 1449         } else {
 1450                 ia->ia6_ndpr->ndpr_refcnt--;
 1451                 ia->ia6_ndpr = NULL;
 1452         }
 1453 
 1454         /*
 1455          * Also, if the address being removed is autoconf'ed, call
 1456          * pfxlist_onlink_check() since the release might affect the status of
 1457          * other (detached) addresses.
 1458          */
 1459         if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
 1460                 pfxlist_onlink_check();
 1461         }
 1462         ifa_free(&ia->ia_ifa);                  /* in6_ifaddrhead */
 1463         splx(s);
 1464 }
 1465 
 1466 void
 1467 in6_purgeif(struct ifnet *ifp)
 1468 {
 1469         struct ifaddr *ifa, *nifa;
 1470 
 1471         TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
 1472                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1473                         continue;
 1474                 in6_purgeaddr(ifa);
 1475         }
 1476 
 1477         in6_ifdetach(ifp);
 1478 }
 1479 
 1480 /*
 1481  * SIOC[GAD]LIFADDR.
 1482  *      SIOCGLIFADDR: get first address. (?)
 1483  *      SIOCGLIFADDR with IFLR_PREFIX:
 1484  *              get first address that matches the specified prefix.
 1485  *      SIOCALIFADDR: add the specified address.
 1486  *      SIOCALIFADDR with IFLR_PREFIX:
 1487  *              add the specified prefix, filling hostid part from
 1488  *              the first link-local address.  prefixlen must be <= 64.
 1489  *      SIOCDLIFADDR: delete the specified address.
 1490  *      SIOCDLIFADDR with IFLR_PREFIX:
 1491  *              delete the first address that matches the specified prefix.
 1492  * return values:
 1493  *      EINVAL on invalid parameters
 1494  *      EADDRNOTAVAIL on prefix match failed/specified address not found
 1495  *      other values may be returned from in6_ioctl()
 1496  *
 1497  * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
 1498  * this is to accomodate address naming scheme other than RFC2374,
 1499  * in the future.
 1500  * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
 1501  * address encoding scheme. (see figure on page 8)
 1502  */
 1503 static int
 1504 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
 1505     struct ifnet *ifp, struct thread *td)
 1506 {
 1507         struct if_laddrreq *iflr = (struct if_laddrreq *)data;
 1508         struct ifaddr *ifa;
 1509         struct sockaddr *sa;
 1510 
 1511         /* sanity checks */
 1512         if (!data || !ifp) {
 1513                 panic("invalid argument to in6_lifaddr_ioctl");
 1514                 /* NOTREACHED */
 1515         }
 1516 
 1517         switch (cmd) {
 1518         case SIOCGLIFADDR:
 1519                 /* address must be specified on GET with IFLR_PREFIX */
 1520                 if ((iflr->flags & IFLR_PREFIX) == 0)
 1521                         break;
 1522                 /* FALLTHROUGH */
 1523         case SIOCALIFADDR:
 1524         case SIOCDLIFADDR:
 1525                 /* address must be specified on ADD and DELETE */
 1526                 sa = (struct sockaddr *)&iflr->addr;
 1527                 if (sa->sa_family != AF_INET6)
 1528                         return EINVAL;
 1529                 if (sa->sa_len != sizeof(struct sockaddr_in6))
 1530                         return EINVAL;
 1531                 /* XXX need improvement */
 1532                 sa = (struct sockaddr *)&iflr->dstaddr;
 1533                 if (sa->sa_family && sa->sa_family != AF_INET6)
 1534                         return EINVAL;
 1535                 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
 1536                         return EINVAL;
 1537                 break;
 1538         default: /* shouldn't happen */
 1539 #if 0
 1540                 panic("invalid cmd to in6_lifaddr_ioctl");
 1541                 /* NOTREACHED */
 1542 #else
 1543                 return EOPNOTSUPP;
 1544 #endif
 1545         }
 1546         if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
 1547                 return EINVAL;
 1548 
 1549         switch (cmd) {
 1550         case SIOCALIFADDR:
 1551             {
 1552                 struct in6_aliasreq ifra;
 1553                 struct in6_addr *hostid = NULL;
 1554                 int prefixlen;
 1555 
 1556                 ifa = NULL;
 1557                 if ((iflr->flags & IFLR_PREFIX) != 0) {
 1558                         struct sockaddr_in6 *sin6;
 1559 
 1560                         /*
 1561                          * hostid is to fill in the hostid part of the
 1562                          * address.  hostid points to the first link-local
 1563                          * address attached to the interface.
 1564                          */
 1565                         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
 1566                         if (!ifa)
 1567                                 return EADDRNOTAVAIL;
 1568                         hostid = IFA_IN6(ifa);
 1569 
 1570                         /* prefixlen must be <= 64. */
 1571                         if (64 < iflr->prefixlen) {
 1572                                 if (ifa != NULL)
 1573                                         ifa_free(ifa);
 1574                                 return EINVAL;
 1575                         }
 1576                         prefixlen = iflr->prefixlen;
 1577 
 1578                         /* hostid part must be zero. */
 1579                         sin6 = (struct sockaddr_in6 *)&iflr->addr;
 1580                         if (sin6->sin6_addr.s6_addr32[2] != 0 ||
 1581                             sin6->sin6_addr.s6_addr32[3] != 0) {
 1582                                 if (ifa != NULL)
 1583                                         ifa_free(ifa);
 1584                                 return EINVAL;
 1585                         }
 1586                 } else
 1587                         prefixlen = iflr->prefixlen;
 1588 
 1589                 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
 1590                 bzero(&ifra, sizeof(ifra));
 1591                 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
 1592 
 1593                 bcopy(&iflr->addr, &ifra.ifra_addr,
 1594                     ((struct sockaddr *)&iflr->addr)->sa_len);
 1595                 if (hostid) {
 1596                         /* fill in hostid part */
 1597                         ifra.ifra_addr.sin6_addr.s6_addr32[2] =
 1598                             hostid->s6_addr32[2];
 1599                         ifra.ifra_addr.sin6_addr.s6_addr32[3] =
 1600                             hostid->s6_addr32[3];
 1601                 }
 1602 
 1603                 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
 1604                         bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
 1605                             ((struct sockaddr *)&iflr->dstaddr)->sa_len);
 1606                         if (hostid) {
 1607                                 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
 1608                                     hostid->s6_addr32[2];
 1609                                 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
 1610                                     hostid->s6_addr32[3];
 1611                         }
 1612                 }
 1613                 if (ifa != NULL)
 1614                         ifa_free(ifa);
 1615 
 1616                 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
 1617                 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
 1618 
 1619                 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
 1620                 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
 1621             }
 1622         case SIOCGLIFADDR:
 1623         case SIOCDLIFADDR:
 1624             {
 1625                 struct in6_ifaddr *ia;
 1626                 struct in6_addr mask, candidate, match;
 1627                 struct sockaddr_in6 *sin6;
 1628                 int cmp;
 1629 
 1630                 bzero(&mask, sizeof(mask));
 1631                 if (iflr->flags & IFLR_PREFIX) {
 1632                         /* lookup a prefix rather than address. */
 1633                         in6_prefixlen2mask(&mask, iflr->prefixlen);
 1634 
 1635                         sin6 = (struct sockaddr_in6 *)&iflr->addr;
 1636                         bcopy(&sin6->sin6_addr, &match, sizeof(match));
 1637                         match.s6_addr32[0] &= mask.s6_addr32[0];
 1638                         match.s6_addr32[1] &= mask.s6_addr32[1];
 1639                         match.s6_addr32[2] &= mask.s6_addr32[2];
 1640                         match.s6_addr32[3] &= mask.s6_addr32[3];
 1641 
 1642                         /* if you set extra bits, that's wrong */
 1643                         if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
 1644                                 return EINVAL;
 1645 
 1646                         cmp = 1;
 1647                 } else {
 1648                         if (cmd == SIOCGLIFADDR) {
 1649                                 /* on getting an address, take the 1st match */
 1650                                 cmp = 0;        /* XXX */
 1651                         } else {
 1652                                 /* on deleting an address, do exact match */
 1653                                 in6_prefixlen2mask(&mask, 128);
 1654                                 sin6 = (struct sockaddr_in6 *)&iflr->addr;
 1655                                 bcopy(&sin6->sin6_addr, &match, sizeof(match));
 1656 
 1657                                 cmp = 1;
 1658                         }
 1659                 }
 1660 
 1661                 IF_ADDR_RLOCK(ifp);
 1662                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1663                         if (ifa->ifa_addr->sa_family != AF_INET6)
 1664                                 continue;
 1665                         if (!cmp)
 1666                                 break;
 1667 
 1668                         /*
 1669                          * XXX: this is adhoc, but is necessary to allow
 1670                          * a user to specify fe80::/64 (not /10) for a
 1671                          * link-local address.
 1672                          */
 1673                         bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
 1674                         in6_clearscope(&candidate);
 1675                         candidate.s6_addr32[0] &= mask.s6_addr32[0];
 1676                         candidate.s6_addr32[1] &= mask.s6_addr32[1];
 1677                         candidate.s6_addr32[2] &= mask.s6_addr32[2];
 1678                         candidate.s6_addr32[3] &= mask.s6_addr32[3];
 1679                         if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
 1680                                 break;
 1681                 }
 1682                 if (ifa != NULL)
 1683                         ifa_ref(ifa);
 1684                 IF_ADDR_RUNLOCK(ifp);
 1685                 if (!ifa)
 1686                         return EADDRNOTAVAIL;
 1687                 ia = ifa2ia6(ifa);
 1688 
 1689                 if (cmd == SIOCGLIFADDR) {
 1690                         int error;
 1691 
 1692                         /* fill in the if_laddrreq structure */
 1693                         bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
 1694                         error = sa6_recoverscope(
 1695                             (struct sockaddr_in6 *)&iflr->addr);
 1696                         if (error != 0) {
 1697                                 ifa_free(ifa);
 1698                                 return (error);
 1699                         }
 1700 
 1701                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 1702                                 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
 1703                                     ia->ia_dstaddr.sin6_len);
 1704                                 error = sa6_recoverscope(
 1705                                     (struct sockaddr_in6 *)&iflr->dstaddr);
 1706                                 if (error != 0) {
 1707                                         ifa_free(ifa);
 1708                                         return (error);
 1709                                 }
 1710                         } else
 1711                                 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
 1712 
 1713                         iflr->prefixlen =
 1714                             in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
 1715 
 1716                         iflr->flags = ia->ia6_flags;    /* XXX */
 1717                         ifa_free(ifa);
 1718 
 1719                         return 0;
 1720                 } else {
 1721                         struct in6_aliasreq ifra;
 1722 
 1723                         /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
 1724                         bzero(&ifra, sizeof(ifra));
 1725                         bcopy(iflr->iflr_name, ifra.ifra_name,
 1726                             sizeof(ifra.ifra_name));
 1727 
 1728                         bcopy(&ia->ia_addr, &ifra.ifra_addr,
 1729                             ia->ia_addr.sin6_len);
 1730                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 1731                                 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
 1732                                     ia->ia_dstaddr.sin6_len);
 1733                         } else {
 1734                                 bzero(&ifra.ifra_dstaddr,
 1735                                     sizeof(ifra.ifra_dstaddr));
 1736                         }
 1737                         bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
 1738                             ia->ia_prefixmask.sin6_len);
 1739 
 1740                         ifra.ifra_flags = ia->ia6_flags;
 1741                         ifa_free(ifa);
 1742                         return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
 1743                             ifp, td);
 1744                 }
 1745             }
 1746         }
 1747 
 1748         return EOPNOTSUPP;      /* just for safety */
 1749 }
 1750 
 1751 /*
 1752  * Initialize an interface's IPv6 address and routing table entry.
 1753  */
 1754 static int
 1755 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
 1756     struct sockaddr_in6 *sin6, int newhost)
 1757 {
 1758         int     error = 0, plen, ifacount = 0;
 1759         int     s = splimp();
 1760         struct ifaddr *ifa;
 1761 
 1762         /*
 1763          * Give the interface a chance to initialize
 1764          * if this is its first address,
 1765          * and to validate the address if necessary.
 1766          */
 1767         IF_ADDR_RLOCK(ifp);
 1768         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1769                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1770                         continue;
 1771                 ifacount++;
 1772         }
 1773         IF_ADDR_RUNLOCK(ifp);
 1774 
 1775         ia->ia_addr = *sin6;
 1776 
 1777         if (ifacount <= 1 && ifp->if_ioctl) {
 1778                 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
 1779                 if (error) {
 1780                         splx(s);
 1781                         return (error);
 1782                 }
 1783         }
 1784         splx(s);
 1785 
 1786         ia->ia_ifa.ifa_metric = ifp->if_metric;
 1787 
 1788         /* we could do in(6)_socktrim here, but just omit it at this moment. */
 1789 
 1790         /*
 1791          * Special case:
 1792          * If a new destination address is specified for a point-to-point
 1793          * interface, install a route to the destination as an interface
 1794          * direct route. 
 1795          * XXX: the logic below rejects assigning multiple addresses on a p2p
 1796          * interface that share the same destination.
 1797          */
 1798         plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
 1799         if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
 1800             ia->ia_dstaddr.sin6_family == AF_INET6) {
 1801                 int rtflags = RTF_UP | RTF_HOST;
 1802                 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
 1803                 if (error)
 1804                         return (error);
 1805                 ia->ia_flags |= IFA_ROUTE;
 1806                 /*
 1807                  * Handle the case for ::1 .
 1808                  */
 1809                 if (ifp->if_flags & IFF_LOOPBACK)
 1810                         ia->ia_flags |= IFA_RTSELF;
 1811         }
 1812 
 1813         /*
 1814          * add a loopback route to self
 1815          */
 1816         if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
 1817                 error = ifa_add_loopback_route((struct ifaddr *)ia,
 1818                                        (struct sockaddr *)&ia->ia_addr);
 1819                 if (error == 0)
 1820                         ia->ia_flags |= IFA_RTSELF;
 1821         }
 1822 
 1823         /* Add local address to lltable, if necessary (ex. on p2p link). */
 1824         if (newhost) {
 1825                 struct llentry *ln;
 1826                 struct rtentry rt;
 1827                 struct sockaddr_dl gateway;
 1828                 struct sockaddr_in6 mask, addr;
 1829 
 1830                 IF_AFDATA_LOCK(ifp);
 1831                 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
 1832                 ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR | LLE_EXCLUSIVE),
 1833                     (struct sockaddr *)&ia->ia_addr);
 1834                 IF_AFDATA_UNLOCK(ifp);
 1835                 if (ln != NULL) {
 1836                         ln->la_expire = 0;  /* for IPv6 this means permanent */
 1837                         ln->ln_state = ND6_LLINFO_REACHABLE;
 1838                         /*
 1839                          * initialize for rtmsg generation
 1840                          */
 1841                         bzero(&gateway, sizeof(gateway));
 1842                         gateway.sdl_len = sizeof(gateway);
 1843                         gateway.sdl_family = AF_LINK;
 1844                         gateway.sdl_nlen = 0;
 1845                         gateway.sdl_alen = 6;
 1846                         memcpy(gateway.sdl_data, &ln->ll_addr.mac_aligned, sizeof(ln->ll_addr));
 1847                         /* */
 1848                         LLE_WUNLOCK(ln);
 1849                 }
 1850 
 1851                 bzero(&rt, sizeof(rt));
 1852                 rt.rt_gateway = (struct sockaddr *)&gateway;
 1853                 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
 1854                 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
 1855                 rt_mask(&rt) = (struct sockaddr *)&mask;
 1856                 rt_key(&rt) = (struct sockaddr *)&addr;
 1857                 rt.rt_flags = RTF_UP | RTF_HOST | RTF_STATIC;
 1858                 /* Announce arrival of local address to all FIBs. */
 1859                 rt_newaddrmsg(RTM_ADD, &ia->ia_ifa, 0, &rt);
 1860         }
 1861 
 1862         return (error);
 1863 }
 1864 
 1865 /*
 1866  * Find an IPv6 interface link-local address specific to an interface.
 1867  * ifaddr is returned referenced.
 1868  */
 1869 struct in6_ifaddr *
 1870 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
 1871 {
 1872         struct ifaddr *ifa;
 1873 
 1874         IF_ADDR_RLOCK(ifp);
 1875         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1876                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1877                         continue;
 1878                 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
 1879                         if ((((struct in6_ifaddr *)ifa)->ia6_flags &
 1880                              ignoreflags) != 0)
 1881                                 continue;
 1882                         ifa_ref(ifa);
 1883                         break;
 1884                 }
 1885         }
 1886         IF_ADDR_RUNLOCK(ifp);
 1887 
 1888         return ((struct in6_ifaddr *)ifa);
 1889 }
 1890 
 1891 
 1892 /*
 1893  * find the internet address corresponding to a given interface and address.
 1894  * ifaddr is returned referenced.
 1895  */
 1896 struct in6_ifaddr *
 1897 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
 1898 {
 1899         struct ifaddr *ifa;
 1900 
 1901         IF_ADDR_RLOCK(ifp);
 1902         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1903                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1904                         continue;
 1905                 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
 1906                         ifa_ref(ifa);
 1907                         break;
 1908                 }
 1909         }
 1910         IF_ADDR_RUNLOCK(ifp);
 1911 
 1912         return ((struct in6_ifaddr *)ifa);
 1913 }
 1914 
 1915 /*
 1916  * Convert IP6 address to printable (loggable) representation. Caller
 1917  * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
 1918  */
 1919 static char digits[] = "0123456789abcdef";
 1920 char *
 1921 ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
 1922 {
 1923         int i;
 1924         char *cp;
 1925         const u_int16_t *a = (const u_int16_t *)addr;
 1926         const u_int8_t *d;
 1927         int dcolon = 0, zero = 0;
 1928 
 1929         cp = ip6buf;
 1930 
 1931         for (i = 0; i < 8; i++) {
 1932                 if (dcolon == 1) {
 1933                         if (*a == 0) {
 1934                                 if (i == 7)
 1935                                         *cp++ = ':';
 1936                                 a++;
 1937                                 continue;
 1938                         } else
 1939                                 dcolon = 2;
 1940                 }
 1941                 if (*a == 0) {
 1942                         if (dcolon == 0 && *(a + 1) == 0) {
 1943                                 if (i == 0)
 1944                                         *cp++ = ':';
 1945                                 *cp++ = ':';
 1946                                 dcolon = 1;
 1947                         } else {
 1948                                 *cp++ = '';
 1949                                 *cp++ = ':';
 1950                         }
 1951                         a++;
 1952                         continue;
 1953                 }
 1954                 d = (const u_char *)a;
 1955                 /* Try to eliminate leading zeros in printout like in :0001. */
 1956                 zero = 1;
 1957                 *cp = digits[*d >> 4];
 1958                 if (*cp != '') {
 1959                         zero = 0;
 1960                         cp++;
 1961                 }
 1962                 *cp = digits[*d++ & 0xf];
 1963                 if (zero == 0 || (*cp != '')) {
 1964                         zero = 0;
 1965                         cp++;
 1966                 }
 1967                 *cp = digits[*d >> 4];
 1968                 if (zero == 0 || (*cp != '')) {
 1969                         zero = 0;
 1970                         cp++;
 1971                 }
 1972                 *cp++ = digits[*d & 0xf];
 1973                 *cp++ = ':';
 1974                 a++;
 1975         }
 1976         *--cp = '\0';
 1977         return (ip6buf);
 1978 }
 1979 
 1980 int
 1981 in6_localaddr(struct in6_addr *in6)
 1982 {
 1983         struct in6_ifaddr *ia;
 1984 
 1985         if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
 1986                 return 1;
 1987 
 1988         IN6_IFADDR_RLOCK();
 1989         TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
 1990                 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
 1991                     &ia->ia_prefixmask.sin6_addr)) {
 1992                         IN6_IFADDR_RUNLOCK();
 1993                         return 1;
 1994                 }
 1995         }
 1996         IN6_IFADDR_RUNLOCK();
 1997 
 1998         return (0);
 1999 }
 2000 
 2001 int
 2002 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
 2003 {
 2004         struct in6_ifaddr *ia;
 2005 
 2006         IN6_IFADDR_RLOCK();
 2007         TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
 2008                 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
 2009                                        &sa6->sin6_addr) &&
 2010                     (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) {
 2011                         IN6_IFADDR_RUNLOCK();
 2012                         return (1); /* true */
 2013                 }
 2014 
 2015                 /* XXX: do we still have to go thru the rest of the list? */
 2016         }
 2017         IN6_IFADDR_RUNLOCK();
 2018 
 2019         return (0);             /* false */
 2020 }
 2021 
 2022 /*
 2023  * return length of part which dst and src are equal
 2024  * hard coding...
 2025  */
 2026 int
 2027 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
 2028 {
 2029         int match = 0;
 2030         u_char *s = (u_char *)src, *d = (u_char *)dst;
 2031         u_char *lim = s + 16, r;
 2032 
 2033         while (s < lim)
 2034                 if ((r = (*d++ ^ *s++)) != 0) {
 2035                         while (r < 128) {
 2036                                 match++;
 2037                                 r <<= 1;
 2038                         }
 2039                         break;
 2040                 } else
 2041                         match += 8;
 2042         return match;
 2043 }
 2044 
 2045 /* XXX: to be scope conscious */
 2046 int
 2047 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
 2048 {
 2049         int bytelen, bitlen;
 2050 
 2051         /* sanity check */
 2052         if (0 > len || len > 128) {
 2053                 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
 2054                     len);
 2055                 return (0);
 2056         }
 2057 
 2058         bytelen = len / 8;
 2059         bitlen = len % 8;
 2060 
 2061         if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
 2062                 return (0);
 2063         if (bitlen != 0 &&
 2064             p1->s6_addr[bytelen] >> (8 - bitlen) !=
 2065             p2->s6_addr[bytelen] >> (8 - bitlen))
 2066                 return (0);
 2067 
 2068         return (1);
 2069 }
 2070 
 2071 void
 2072 in6_prefixlen2mask(struct in6_addr *maskp, int len)
 2073 {
 2074         u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
 2075         int bytelen, bitlen, i;
 2076 
 2077         /* sanity check */
 2078         if (0 > len || len > 128) {
 2079                 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
 2080                     len);
 2081                 return;
 2082         }
 2083 
 2084         bzero(maskp, sizeof(*maskp));
 2085         bytelen = len / 8;
 2086         bitlen = len % 8;
 2087         for (i = 0; i < bytelen; i++)
 2088                 maskp->s6_addr[i] = 0xff;
 2089         if (bitlen)
 2090                 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
 2091 }
 2092 
 2093 /*
 2094  * return the best address out of the same scope. if no address was
 2095  * found, return the first valid address from designated IF.
 2096  */
 2097 struct in6_ifaddr *
 2098 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
 2099 {
 2100         int dst_scope = in6_addrscope(dst), blen = -1, tlen;
 2101         struct ifaddr *ifa;
 2102         struct in6_ifaddr *besta = 0;
 2103         struct in6_ifaddr *dep[2];      /* last-resort: deprecated */
 2104 
 2105         dep[0] = dep[1] = NULL;
 2106 
 2107         /*
 2108          * We first look for addresses in the same scope.
 2109          * If there is one, return it.
 2110          * If two or more, return one which matches the dst longest.
 2111          * If none, return one of global addresses assigned other ifs.
 2112          */
 2113         IF_ADDR_RLOCK(ifp);
 2114         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 2115                 if (ifa->ifa_addr->sa_family != AF_INET6)
 2116                         continue;
 2117                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
 2118                         continue; /* XXX: is there any case to allow anycast? */
 2119                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
 2120                         continue; /* don't use this interface */
 2121                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
 2122                         continue;
 2123                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
 2124                         if (V_ip6_use_deprecated)
 2125                                 dep[0] = (struct in6_ifaddr *)ifa;
 2126                         continue;
 2127                 }
 2128 
 2129                 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
 2130                         /*
 2131                          * call in6_matchlen() as few as possible
 2132                          */
 2133                         if (besta) {
 2134                                 if (blen == -1)
 2135                                         blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
 2136                                 tlen = in6_matchlen(IFA_IN6(ifa), dst);
 2137                                 if (tlen > blen) {
 2138                                         blen = tlen;
 2139                                         besta = (struct in6_ifaddr *)ifa;
 2140                                 }
 2141                         } else
 2142                                 besta = (struct in6_ifaddr *)ifa;
 2143                 }
 2144         }
 2145         if (besta) {
 2146                 ifa_ref(&besta->ia_ifa);
 2147                 IF_ADDR_RUNLOCK(ifp);
 2148                 return (besta);
 2149         }
 2150 
 2151         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 2152                 if (ifa->ifa_addr->sa_family != AF_INET6)
 2153                         continue;
 2154                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
 2155                         continue; /* XXX: is there any case to allow anycast? */
 2156                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
 2157                         continue; /* don't use this interface */
 2158                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
 2159                         continue;
 2160                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
 2161                         if (V_ip6_use_deprecated)
 2162                                 dep[1] = (struct in6_ifaddr *)ifa;
 2163                         continue;
 2164                 }
 2165 
 2166                 if (ifa != NULL)
 2167                         ifa_ref(ifa);
 2168                 IF_ADDR_RUNLOCK(ifp);
 2169                 return (struct in6_ifaddr *)ifa;
 2170         }
 2171 
 2172         /* use the last-resort values, that are, deprecated addresses */
 2173         if (dep[0]) {
 2174                 ifa_ref((struct ifaddr *)dep[0]);
 2175                 IF_ADDR_RUNLOCK(ifp);
 2176                 return dep[0];
 2177         }
 2178         if (dep[1]) {
 2179                 ifa_ref((struct ifaddr *)dep[1]);
 2180                 IF_ADDR_RUNLOCK(ifp);
 2181                 return dep[1];
 2182         }
 2183 
 2184         IF_ADDR_RUNLOCK(ifp);
 2185         return NULL;
 2186 }
 2187 
 2188 /*
 2189  * perform DAD when interface becomes IFF_UP.
 2190  */
 2191 void
 2192 in6_if_up(struct ifnet *ifp)
 2193 {
 2194         struct ifaddr *ifa;
 2195         struct in6_ifaddr *ia;
 2196 
 2197         IF_ADDR_RLOCK(ifp);
 2198         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 2199                 if (ifa->ifa_addr->sa_family != AF_INET6)
 2200                         continue;
 2201                 ia = (struct in6_ifaddr *)ifa;
 2202                 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
 2203                         /*
 2204                          * The TENTATIVE flag was likely set by hand
 2205                          * beforehand, implicitly indicating the need for DAD.
 2206                          * We may be able to skip the random delay in this
 2207                          * case, but we impose delays just in case.
 2208                          */
 2209                         nd6_dad_start(ifa,
 2210                             arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
 2211                 }
 2212         }
 2213         IF_ADDR_RUNLOCK(ifp);
 2214 
 2215         /*
 2216          * special cases, like 6to4, are handled in in6_ifattach
 2217          */
 2218         in6_ifattach(ifp, NULL);
 2219 }
 2220 
 2221 int
 2222 in6if_do_dad(struct ifnet *ifp)
 2223 {
 2224         if ((ifp->if_flags & IFF_LOOPBACK) != 0)
 2225                 return (0);
 2226 
 2227         switch (ifp->if_type) {
 2228 #ifdef IFT_DUMMY
 2229         case IFT_DUMMY:
 2230 #endif
 2231         case IFT_FAITH:
 2232                 /*
 2233                  * These interfaces do not have the IFF_LOOPBACK flag,
 2234                  * but loop packets back.  We do not have to do DAD on such
 2235                  * interfaces.  We should even omit it, because loop-backed
 2236                  * NS would confuse the DAD procedure.
 2237                  */
 2238                 return (0);
 2239         default:
 2240                 /*
 2241                  * Our DAD routine requires the interface up and running.
 2242                  * However, some interfaces can be up before the RUNNING
 2243                  * status.  Additionaly, users may try to assign addresses
 2244                  * before the interface becomes up (or running).
 2245                  * We simply skip DAD in such a case as a work around.
 2246                  * XXX: we should rather mark "tentative" on such addresses,
 2247                  * and do DAD after the interface becomes ready.
 2248                  */
 2249                 if (!((ifp->if_flags & IFF_UP) &&
 2250                     (ifp->if_drv_flags & IFF_DRV_RUNNING)))
 2251                         return (0);
 2252 
 2253                 return (1);
 2254         }
 2255 }
 2256 
 2257 /*
 2258  * Calculate max IPv6 MTU through all the interfaces and store it
 2259  * to in6_maxmtu.
 2260  */
 2261 void
 2262 in6_setmaxmtu(void)
 2263 {
 2264         unsigned long maxmtu = 0;
 2265         struct ifnet *ifp;
 2266 
 2267         IFNET_RLOCK_NOSLEEP();
 2268         TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
 2269                 /* this function can be called during ifnet initialization */
 2270                 if (!ifp->if_afdata[AF_INET6])
 2271                         continue;
 2272                 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
 2273                     IN6_LINKMTU(ifp) > maxmtu)
 2274                         maxmtu = IN6_LINKMTU(ifp);
 2275         }
 2276         IFNET_RUNLOCK_NOSLEEP();
 2277         if (maxmtu)          /* update only when maxmtu is positive */
 2278                 V_in6_maxmtu = maxmtu;
 2279 }
 2280 
 2281 /*
 2282  * Provide the length of interface identifiers to be used for the link attached
 2283  * to the given interface.  The length should be defined in "IPv6 over
 2284  * xxx-link" document.  Note that address architecture might also define
 2285  * the length for a particular set of address prefixes, regardless of the
 2286  * link type.  As clarified in rfc2462bis, those two definitions should be
 2287  * consistent, and those really are as of August 2004.
 2288  */
 2289 int
 2290 in6_if2idlen(struct ifnet *ifp)
 2291 {
 2292         switch (ifp->if_type) {
 2293         case IFT_ETHER:         /* RFC2464 */
 2294 #ifdef IFT_PROPVIRTUAL
 2295         case IFT_PROPVIRTUAL:   /* XXX: no RFC. treat it as ether */
 2296 #endif
 2297 #ifdef IFT_L2VLAN
 2298         case IFT_L2VLAN:        /* ditto */
 2299 #endif
 2300 #ifdef IFT_IEEE80211
 2301         case IFT_IEEE80211:     /* ditto */
 2302 #endif
 2303 #ifdef IFT_MIP
 2304         case IFT_MIP:   /* ditto */
 2305 #endif
 2306                 return (64);
 2307         case IFT_FDDI:          /* RFC2467 */
 2308                 return (64);
 2309         case IFT_ISO88025:      /* RFC2470 (IPv6 over Token Ring) */
 2310                 return (64);
 2311         case IFT_PPP:           /* RFC2472 */
 2312                 return (64);
 2313         case IFT_ARCNET:        /* RFC2497 */
 2314                 return (64);
 2315         case IFT_FRELAY:        /* RFC2590 */
 2316                 return (64);
 2317         case IFT_IEEE1394:      /* RFC3146 */
 2318                 return (64);
 2319         case IFT_GIF:
 2320                 return (64);    /* draft-ietf-v6ops-mech-v2-07 */
 2321         case IFT_LOOP:
 2322                 return (64);    /* XXX: is this really correct? */
 2323         default:
 2324                 /*
 2325                  * Unknown link type:
 2326                  * It might be controversial to use the today's common constant
 2327                  * of 64 for these cases unconditionally.  For full compliance,
 2328                  * we should return an error in this case.  On the other hand,
 2329                  * if we simply miss the standard for the link type or a new
 2330                  * standard is defined for a new link type, the IFID length
 2331                  * is very likely to be the common constant.  As a compromise,
 2332                  * we always use the constant, but make an explicit notice
 2333                  * indicating the "unknown" case.
 2334                  */
 2335                 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
 2336                 return (64);
 2337         }
 2338 }
 2339 
 2340 #include <sys/sysctl.h>
 2341 
 2342 struct in6_llentry {
 2343         struct llentry          base;
 2344         struct sockaddr_in6     l3_addr6;
 2345 };
 2346 
 2347 static struct llentry *
 2348 in6_lltable_new(const struct sockaddr *l3addr, u_int flags)
 2349 {
 2350         struct in6_llentry *lle;
 2351 
 2352         lle = malloc(sizeof(struct in6_llentry), M_LLTABLE,
 2353             M_DONTWAIT | M_ZERO);
 2354         if (lle == NULL)                /* NB: caller generates msg */
 2355                 return NULL;
 2356 
 2357         lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr;
 2358         lle->base.lle_refcnt = 1;
 2359         LLE_LOCK_INIT(&lle->base);
 2360         callout_init_rw(&lle->base.ln_timer_ch, &lle->base.lle_lock,
 2361             CALLOUT_RETURNUNLOCKED);
 2362 
 2363         return &lle->base;
 2364 }
 2365 
 2366 /*
 2367  * Deletes an address from the address table.
 2368  * This function is called by the timer functions
 2369  * such as arptimer() and nd6_llinfo_timer(), and
 2370  * the caller does the locking.
 2371  */
 2372 static void
 2373 in6_lltable_free(struct lltable *llt, struct llentry *lle)
 2374 {
 2375         LLE_WUNLOCK(lle);
 2376         LLE_LOCK_DESTROY(lle);
 2377         free(lle, M_LLTABLE);
 2378 }
 2379 
 2380 static void
 2381 in6_lltable_prefix_free(struct lltable *llt, 
 2382                         const struct sockaddr *prefix,
 2383                         const struct sockaddr *mask,
 2384                         u_int flags)
 2385 {
 2386         const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix;
 2387         const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask;
 2388         struct llentry *lle, *next;
 2389         register int i;
 2390 
 2391         /*
 2392          * (flags & LLE_STATIC) means deleting all entries 
 2393          * including static ND6 entries
 2394          */
 2395         for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
 2396                 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
 2397                         if (IN6_ARE_MASKED_ADDR_EQUAL(
 2398                                     &((struct sockaddr_in6 *)L3_ADDR(lle))->sin6_addr, 
 2399                                     &pfx->sin6_addr, 
 2400                                     &msk->sin6_addr) &&
 2401                             ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) {
 2402                                 int canceled;
 2403 
 2404                                 canceled = callout_drain(&lle->la_timer);
 2405                                 LLE_WLOCK(lle);
 2406                                 if (canceled)
 2407                                         LLE_REMREF(lle);
 2408                                 llentry_free(lle);
 2409                         }
 2410                 }
 2411         }
 2412 }
 2413 
 2414 static int
 2415 in6_lltable_rtcheck(struct ifnet *ifp, 
 2416                     u_int flags, 
 2417                     const struct sockaddr *l3addr)
 2418 {
 2419         struct rtentry *rt;
 2420         char ip6buf[INET6_ADDRSTRLEN];
 2421 
 2422         KASSERT(l3addr->sa_family == AF_INET6,
 2423             ("sin_family %d", l3addr->sa_family));
 2424 
 2425         /* Our local addresses are always only installed on the default FIB. */
 2426         /* XXX rtalloc1 should take a const param */
 2427         rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0,
 2428             RT_DEFAULT_FIB);
 2429         if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
 2430                 struct ifaddr *ifa;
 2431                 /* 
 2432                  * Create an ND6 cache for an IPv6 neighbor 
 2433                  * that is not covered by our own prefix.
 2434                  */
 2435                 /* XXX ifaof_ifpforaddr should take a const param */
 2436                 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp);
 2437                 if (ifa != NULL) {
 2438                         ifa_free(ifa);
 2439                         if (rt != NULL)
 2440                                 RTFREE_LOCKED(rt);
 2441                         return 0;
 2442                 }
 2443                 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
 2444                     ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr));
 2445                 if (rt != NULL)
 2446                         RTFREE_LOCKED(rt);
 2447                 return EINVAL;
 2448         }
 2449         RTFREE_LOCKED(rt);
 2450         return 0;
 2451 }
 2452 
 2453 static struct llentry *
 2454 in6_lltable_lookup(struct lltable *llt, u_int flags,
 2455         const struct sockaddr *l3addr)
 2456 {
 2457         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
 2458         struct ifnet *ifp = llt->llt_ifp;
 2459         struct llentry *lle;
 2460         struct llentries *lleh;
 2461         u_int hashkey;
 2462 
 2463         IF_AFDATA_LOCK_ASSERT(ifp);
 2464         KASSERT(l3addr->sa_family == AF_INET6,
 2465             ("sin_family %d", l3addr->sa_family));
 2466 
 2467         hashkey = sin6->sin6_addr.s6_addr32[3];
 2468         lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
 2469         LIST_FOREACH(lle, lleh, lle_next) {
 2470                 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle);
 2471                 if (lle->la_flags & LLE_DELETED)
 2472                         continue;
 2473                 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr, 
 2474                          sizeof(struct in6_addr)) == 0)
 2475                         break;
 2476         }
 2477 
 2478         if (lle == NULL) {
 2479                 if (!(flags & LLE_CREATE))
 2480                         return (NULL);
 2481                 /*
 2482                  * A route that covers the given address must have
 2483                  * been installed 1st because we are doing a resolution,
 2484                  * verify this.
 2485                  */
 2486                 if (!(flags & LLE_IFADDR) &&
 2487                     in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
 2488                         return NULL;
 2489 
 2490                 lle = in6_lltable_new(l3addr, flags);
 2491                 if (lle == NULL) {
 2492                         log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
 2493                         return NULL;
 2494                 }
 2495                 lle->la_flags = flags & ~LLE_CREATE;
 2496                 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
 2497                         bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
 2498                         lle->la_flags |= (LLE_VALID | LLE_STATIC);
 2499                 }
 2500 
 2501                 lle->lle_tbl  = llt;
 2502                 lle->lle_head = lleh;
 2503                 LIST_INSERT_HEAD(lleh, lle, lle_next);
 2504         } else if (flags & LLE_DELETE) {
 2505                 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
 2506                         LLE_WLOCK(lle);
 2507                         lle->la_flags = LLE_DELETED;
 2508                         LLE_WUNLOCK(lle);
 2509 #ifdef DIAGNOSTIC
 2510                         log(LOG_INFO, "ifaddr cache = %p  is deleted\n", lle);  
 2511 #endif  
 2512                 }
 2513                 lle = (void *)-1;
 2514         }
 2515         if (LLE_IS_VALID(lle)) {
 2516                 if (flags & LLE_EXCLUSIVE)
 2517                         LLE_WLOCK(lle);
 2518                 else
 2519                         LLE_RLOCK(lle);
 2520         }
 2521         return (lle);
 2522 }
 2523 
 2524 static int
 2525 in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
 2526 {
 2527         struct ifnet *ifp = llt->llt_ifp;
 2528         struct llentry *lle;
 2529         /* XXX stack use */
 2530         struct {
 2531                 struct rt_msghdr        rtm;
 2532                 struct sockaddr_in6     sin6;
 2533                 /*
 2534                  * ndp.c assumes that sdl is word aligned
 2535                  */
 2536 #ifdef __LP64__
 2537                 uint32_t                pad;
 2538 #endif
 2539                 struct sockaddr_dl      sdl;
 2540         } ndpc;
 2541         int i, error;
 2542 
 2543         if (ifp->if_flags & IFF_LOOPBACK)
 2544                 return 0;
 2545 
 2546         LLTABLE_LOCK_ASSERT();
 2547 
 2548         error = 0;
 2549         for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
 2550                 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
 2551                         struct sockaddr_dl *sdl;
 2552 
 2553                         /* skip deleted or invalid entries */
 2554                         if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID)
 2555                                 continue;
 2556                         /* Skip if jailed and not a valid IP of the prison. */
 2557                         if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
 2558                                 continue;
 2559                         /*
 2560                          * produce a msg made of:
 2561                          *  struct rt_msghdr;
 2562                          *  struct sockaddr_in6 (IPv6)
 2563                          *  struct sockaddr_dl;
 2564                          */
 2565                         bzero(&ndpc, sizeof(ndpc));
 2566                         ndpc.rtm.rtm_msglen = sizeof(ndpc);
 2567                         ndpc.rtm.rtm_version = RTM_VERSION;
 2568                         ndpc.rtm.rtm_type = RTM_GET;
 2569                         ndpc.rtm.rtm_flags = RTF_UP;
 2570                         ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
 2571                         ndpc.sin6.sin6_family = AF_INET6;
 2572                         ndpc.sin6.sin6_len = sizeof(ndpc.sin6);
 2573                         bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle));
 2574 
 2575                         /* publish */
 2576                         if (lle->la_flags & LLE_PUB)
 2577                                 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
 2578 
 2579                         sdl = &ndpc.sdl;
 2580                         sdl->sdl_family = AF_LINK;
 2581                         sdl->sdl_len = sizeof(*sdl);
 2582                         sdl->sdl_alen = ifp->if_addrlen;
 2583                         sdl->sdl_index = ifp->if_index;
 2584                         sdl->sdl_type = ifp->if_type;
 2585                         bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
 2586                         ndpc.rtm.rtm_rmx.rmx_expire =
 2587                             lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
 2588                         ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
 2589                         if (lle->la_flags & LLE_STATIC)
 2590                                 ndpc.rtm.rtm_flags |= RTF_STATIC;
 2591                         ndpc.rtm.rtm_index = ifp->if_index;
 2592                         error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
 2593                         if (error)
 2594                                 break;
 2595                 }
 2596         }
 2597         return error;
 2598 }
 2599 
 2600 void *
 2601 in6_domifattach(struct ifnet *ifp)
 2602 {
 2603         struct in6_ifextra *ext;
 2604 
 2605         ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
 2606         bzero(ext, sizeof(*ext));
 2607 
 2608         ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat),
 2609             M_IFADDR, M_WAITOK);
 2610         bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
 2611 
 2612         ext->icmp6_ifstat =
 2613             (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat),
 2614             M_IFADDR, M_WAITOK);
 2615         bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
 2616 
 2617         ext->nd_ifinfo = nd6_ifattach(ifp);
 2618         ext->scope6_id = scope6_ifattach(ifp);
 2619         ext->lltable = lltable_init(ifp, AF_INET6);
 2620         if (ext->lltable != NULL) {
 2621                 ext->lltable->llt_free = in6_lltable_free;
 2622                 ext->lltable->llt_prefix_free = in6_lltable_prefix_free;
 2623                 ext->lltable->llt_lookup = in6_lltable_lookup;
 2624                 ext->lltable->llt_dump = in6_lltable_dump;
 2625         }
 2626 
 2627         ext->mld_ifinfo = mld_domifattach(ifp);
 2628 
 2629         return ext;
 2630 }
 2631 
 2632 void
 2633 in6_domifdetach(struct ifnet *ifp, void *aux)
 2634 {
 2635         struct in6_ifextra *ext = (struct in6_ifextra *)aux;
 2636 
 2637         mld_domifdetach(ifp);
 2638         scope6_ifdetach(ext->scope6_id);
 2639         nd6_ifdetach(ext->nd_ifinfo);
 2640         lltable_free(ext->lltable);
 2641         free(ext->in6_ifstat, M_IFADDR);
 2642         free(ext->icmp6_ifstat, M_IFADDR);
 2643         free(ext, M_IFADDR);
 2644 }
 2645 
 2646 /*
 2647  * Convert sockaddr_in6 to sockaddr_in.  Original sockaddr_in6 must be
 2648  * v4 mapped addr or v4 compat addr
 2649  */
 2650 void
 2651 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
 2652 {
 2653 
 2654         bzero(sin, sizeof(*sin));
 2655         sin->sin_len = sizeof(struct sockaddr_in);
 2656         sin->sin_family = AF_INET;
 2657         sin->sin_port = sin6->sin6_port;
 2658         sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
 2659 }
 2660 
 2661 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
 2662 void
 2663 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
 2664 {
 2665         bzero(sin6, sizeof(*sin6));
 2666         sin6->sin6_len = sizeof(struct sockaddr_in6);
 2667         sin6->sin6_family = AF_INET6;
 2668         sin6->sin6_port = sin->sin_port;
 2669         sin6->sin6_addr.s6_addr32[0] = 0;
 2670         sin6->sin6_addr.s6_addr32[1] = 0;
 2671         sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
 2672         sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
 2673 }
 2674 
 2675 /* Convert sockaddr_in6 into sockaddr_in. */
 2676 void
 2677 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
 2678 {
 2679         struct sockaddr_in *sin_p;
 2680         struct sockaddr_in6 sin6;
 2681 
 2682         /*
 2683          * Save original sockaddr_in6 addr and convert it
 2684          * to sockaddr_in.
 2685          */
 2686         sin6 = *(struct sockaddr_in6 *)nam;
 2687         sin_p = (struct sockaddr_in *)nam;
 2688         in6_sin6_2_sin(sin_p, &sin6);
 2689 }
 2690 
 2691 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
 2692 void
 2693 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
 2694 {
 2695         struct sockaddr_in *sin_p;
 2696         struct sockaddr_in6 *sin6_p;
 2697 
 2698         sin6_p = malloc(sizeof *sin6_p, M_SONAME,
 2699                M_WAITOK);
 2700         sin_p = (struct sockaddr_in *)*nam;
 2701         in6_sin_2_v4mapsin6(sin_p, sin6_p);
 2702         free(*nam, M_SONAME);
 2703         *nam = (struct sockaddr *)sin6_p;
 2704 }

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